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diff --git a/etc/mtree/BSD.include.dist b/etc/mtree/BSD.include.dist
--- a/etc/mtree/BSD.include.dist
+++ b/etc/mtree/BSD.include.dist
@@ -269,6 +269,10 @@
..
netinet6
..
+ netlink
+ route
+ ..
+ ..
netipsec
..
netnatm
diff --git a/share/man/man4/netlink.4 b/share/man/man4/netlink.4
new file mode 100644
--- /dev/null
+++ b/share/man/man4/netlink.4
@@ -0,0 +1,356 @@
+.\"
+.\" Copyright (C) 2022 Alexander Chernikov <melifaro@FreeBSD.org>.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice(s), this list of conditions and the following disclaimer as
+.\" the first lines of this file unmodified other than the possible
+.\" addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice(s), this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
+.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+.\" DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 30, 2022
+.Dt NETLINK 4
+.Os
+.Sh NAME
+.Nm Netlink
+.Nd Kernel network configuration protocol
+.Sh SYNOPSIS
+.In netlink/netlink.h
+.In netlink/netlink_route.h
+.Ft int
+.Fn socket AF_NETLINK SOCK_DGRAM int family
+.Sh DESCRIPTION
+The
+.Tn Netlink
+is a user-kernel message-based communication protocol primarily used for the
+network stack configuration.
+.Tn Netlink
+is easily extendable and provides support for large dumps and event
+notifications, all via a single socket.
+The protocol is fully asynchronous, allowing to issue and track multiple
+requests at once.
+.Tn Netlink
+consists of multiple families, which commonly group the commands belonging
+to the particular kernel subsystem.
+Currently, the supported families are:
+.Pp
+.Bd -literal -offset indent -compact
+NETLINK_ROUTE network configuration,
+NETLINK_GENERIC "container" family
+.Ed
+.Pp
+The
+.Dv NETLINK_ROUTE
+family handles all interfaces, addresses, neighrors, routes and VNETs
+configuration.
+More details can be found in
+.Xr rtnetlink 4
+page.
+The
+.Dv NETLINK_GENERIC
+serves as a "container" family, allowing to register other families under
+.Dv NETLINK_GENERIC
+umbrella.
+This approach allows to use single netlink socket to interact with
+multiple netlink families at once.
+More details can be found in
+.Xr genetlink 4
+page.
+.Pp
+.Tn Netlink has its own sockaddr structure:
+.Bd -literal
+struct sockaddr_nl {
+ uint8_t nl_len; /* sizeof(sockaddr_nl) */
+ sa_family_t nl_family; /* netlink family */
+ uint16_t nl_pad; /* reserved, set to 0 */
+ uint32_t nl_pid; /* automatically selected, set to 0 */
+ uint32_t nl_groups; /* multicast groups mask to bind to */
+};
+.Ed
+.Pp
+Normally, filling of this structure is not required for the socket operations.
+It is presented here for the sake of completness.
+.Sh PROTOCOL DESCRIPTION
+Protocol is message-based.
+Each message starts with the mandatory
+.Fa nlmsghdr
+header, followed by the family-specific header and the list of
+type-length-value pairs (TLVs).
+TLVs can be nested.
+All headers and TLVS are 32-bit-padded.
+Each
+.Xr send 2 or
+.Xr recv 2
+system call may contain multiple messages.
+.Ss BASE HEADER
+.Bd -literal
+struct nlmsghdr {
+ uint32_t nlmsg_len; /* Length of message including header */
+ uint16_t nlmsg_type; /* Message type identifier */
+ uint16_t nlmsg_flags; /* Flags (NLM_F_) */
+ uint32_t nlmsg_seq; /* Sequence number */
+ uint32_t nlmsg_pid; /* Sending process port ID */
+};
+.Ed
+.Pp
+The
+.Fa nlmsg_len
+is the whole message length, in bytes, incuding the header.
+It has to be rounded to the nearest 32-bit boundary when iterating
+over messages.
+.Fa nlmsg_type
+represents the command/request type.
+This value is family-specific.
+The list of the supported commands can be found in the relevant family
+header file.
+.Fa nlmsg_seq
+is a user-provided request identifier.
+An application can track the operation result by tracking the
+.Dv NLMSG_ERROR
+messages and matching the
+.Fa nlmsg_seq
+.
+The
+.Fa nlmsg_pid
+represents message sender id.
+This field is optional for userland.
+Kernel sender ID is zero.
+.Fa nlmsg_flags
+contains the message-specific flags.
+The following generic flags are defined:
+.Pp
+.Bd -literal -offset indent -compact
+NLM_F_REQUEST Indicates that the message is an actual request to the kernel
+NLM_F_ACK Request an explicit ACK messages with an operation result
+.Ed
+.Pp
+The following generic flags are defined for the "GET" request types:
+.Pp
+.Bd -literal -offset indent -compact
+NLM_F_ROOT Return the whole dataset
+NLM_F_MATCH Return all entries matching criteria
+.Ed
+These two flags typically used in a combination, aliased to
+.Fa NLM_F_DUMP
+.Pp
+The following generic flags are defined for the "NEW" request types:
+.Pp
+.Bd -literal -offset indent -compact
+NLM_F_CREATE Create an object if not exists
+NLM_F_EXCL Don't replace an object if exists
+NLM_F_REPLACE Replace an existing matching object
+NLM_F_APPEND Append to an existing object
+.Ed
+.Pp
+The following generic flags are defined for the replies:
+.Pp
+.Bd -literal -offset indent -compact
+NLM_F_MULTI Indicates that the message is part of the message group
+NLM_F_DUMP_INTR Indicates that the state dump was not completed
+NLM_F_DUMP_FILTERED Indicates that the dump was filtered per request
+NLM_F_CAPPED Indicates the original message was capped to its header
+NLM_F_ACK_TLVS Indicates that extended ACK TLVs were included
+.Ed
+.Ss TLVs
+Most attributes in the messages are encoded as the type-length-value pair
+(TLVs).
+The base TLV header:
+.Bd -literal
+struct nlattr {
+ uint16_t nla_len; /* Total attribute length */
+ uint16_t nla_type; /* Attribute type */
+};
+.Ed
+TLV type (
+.Fa nla_type
+) scope typically is the message type or group of messages within a family.
+For example,
+.Dv RTN_MULTICAST type value is only valid for
+.Dv RTM_NEWROUTE
+,
+.Dv RTM_DELROUTE
+and
+.Dv RTM_GETROUTE
+messages.
+TLVs can be nested, in that case internal TLVs may have their own sub-types.
+All TLVs packed with 32-bit padding.
+.Ss CONTROL MESSAGES
+A number of generic control messages are reserved in each family.
+.Pp
+.Dv NLMSG_ERROR
+message reports the operation result, if requested, optionally followed by
+the metadata TLVs.
+Value of the
+.Fa nlmsg_seq
+is set to the value of the original messages, while
+.Fa nlmsg_pid
+is set to the socket pid of the original socket.
+The operation result is reported via
+.Vt "struct nlmsgerr":
+.Bd -literal
+struct nlmsgerr {
+ int error; /* Standard errno */
+ struct nlmsghdr msg; /* Original message header */
+};
+.Ed
+If
+.Dv NETLINK_CAP_ACK
+socket option is not set, the remainder of the original message will follow.
+If
+.Dv NETLINK_EXT_ACK
+socket option is set, kernel may add
+.Dv NLMSGERR_ATTR_MSG
+string TLV with the textual error description, optionally followed by the
+.Dv NLMSGERR_ATTR_OFFS
+TLV, indicating the offset from the message start, that triggered an error.
+.Pp
+.Dv NLMSG_DONE
+message indicates the end of the message group - typically, the end of the
+dump.
+It consist of a single
+.Fa int
+field, describing dump result as standard errno value.
+.Sh SOCKET OPTIONS
+.Tn NETLINK
+supports a number of custom socket options which can be set with
+.Xr setsockopt 2
+with
+.Dv SOL_NETLINK
+level:
+.Bl -tag -width indent
+.It Dv NETLINK_ADD_MEMBERSHIP
+Subscribes for the notifications for the specific group (int).
+.It Dv NETLINK_ADD_MEMBERSHIP
+Unsubscribes from the notifications for the specific group (int).
+.It Dv NETLINK_LIST_MEMBERSHIPS
+Lists the memberships as bitmask.
+.It Dv NETLINK_CAP_ACK
+Instructs kernel to send original message header in the reply,
+without the message body.
+.It Dv NETLINK_EXT_ACK
+Acknowledges capability to receive additional TLVs in the ACK message.
+.El
+.Pp
+Additionally,
+.Tn Netlink
+overrides the following socket options from the
+.Dv SOL_SOCKET
+level:
+.Bl -tag -width indent
+.It Dv SO_RCVBUF
+Sets the maximum size od the socket receive buffer.
+If the caller has
+.Dv PRIV_NET_ROUTE
+permission, the value can exceed the currenly-set
+.Va kern.ipc.maxsockbuf
+value.
+.El
+.Sh SYSCTL VARIABLES
+A set of
+.Xr sysctl 8
+variables controls the behaviour of the firewall and
+associated modules
+.Bl -tag -width indent
+.It Va net.netlink.sendspace
+Default send buffer for the netlink socket.
+Note that the socket sendspace has to be greater or equal to the maximum
+message that can be transmitted via this socket.
+.El
+.Bl -tag -width indent
+.It Va net.netlink.recvspace
+Default receive buffer for the netlink socket.
+Note that the socket sendspace has to be greater or equal to the maximum
+message that can be received from this socket.
+.El
+.Sh DEBUGGING
+.Tn Netlink
+implements per-file debugging with different severify controllable via
+.Va net.netlink.debug
+branch.
+These messages are logged in the kernel message buffer and can be seen in
+.Xr dmesg 8
+.
+The following severity levels are defined:
+.Bl -tag -width indent
+.It Dv LOG_DEBUG(7)
+Rare events or per-socket errors are reported here.
+This is the default level, not impacting production performance.
+.It Dv LOG_DEBUG2(8)
+Socket events such as groups membershp, privilege checks, commands and dumps
+are logged.
+This level does not incur significant performance overhead.
+.It Dv LOG_DEBUG9(9)
+All socket events, each dumped or modified entities are logged.
+Turning it on may result in significant performance overhead.
+.El
+.Sh ERRORS
+Netlink reports operation results, including errors and error metadata, by
+sending
+.Dv NLMSG_ERROR
+message for each request message.
+The following errors can be returned:
+.Bl -tag -width Er
+.It Bq Er EPERM
+when the current privileges are insufficient to perform the required operation;
+.It Bo Er ENOBUFS Bc or Bo Er ENOMEM Bc
+when the system runs out of memory for
+an internal data structure;
+.It Bq Er ENOTSUP
+when the requested command is not supported by the family or
+the family is not supported;
+.It Bq Er EINVAL
+when some nessesary TLVs are missing or invalid, detailed info
+may be provided in NLMSGERR_ATTR_MSG and NLMSGERR_ATTR_OFFS TLVs;
+.It Bq Er ENOENT
+when trying to delete non-existing object.
+.Pp
+Additionally, a socket operation iself may fail with one of the errors
+specified in
+.Xr socket 2
+,
+.Xr recv 2
+or
+.Xr send 2
+.
+.El
+.Sh SEE ALSO
+.Xr genetrlink 4 ,
+.Xr rtnetlink 4
+.Rs
+.%A "J. Salim"
+.%A "H. Khosravi"
+.%A "A. Kleen"
+.%A "A. Kuznetsov"
+.%T "Linux Netlink as an IP Services Protocol"
+.%O "RFC 3549"
+.Re
+.Sh HISTORY
+The
+.Tn NETLINK
+protocol appeared in
+.Fx 14.0 .
+.Sh AUTHORS
+.Tn Netlink
+implementation was written by
+.An -nosplit
+.An Alexander Chernikov Aq Mt melifaro@FreeBSD.org .
+It was derived from the Summer of Code 2021 project by
+.An Ng Peng Nam Sean .
diff --git a/share/man/man4/rtnetlink.4 b/share/man/man4/rtnetlink.4
new file mode 100644
--- /dev/null
+++ b/share/man/man4/rtnetlink.4
@@ -0,0 +1,181 @@
+.\"
+.\" Copyright (C) 2022 Alexander Chernikov <melifaro@FreeBSD.org>.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice(s), this list of conditions and the following disclaimer as
+.\" the first lines of this file unmodified other than the possible
+.\" addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice(s), this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
+.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+.\" DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 30, 2022
+.Dt RTNETLINK 4
+.Os
+.Sh NAME
+.Nm RTNetlink
+.Nd Network configuration-specific Netlink family
+.Sh SYNOPSIS
+.In netlink/netlink.h
+.In netlink/netlink_route.h
+.Ft int
+.Fn socket AF_NETLINK SOCK_DGRAM NETLINK_ROUTE
+.Sh DESCRIPTION
+The
+.Tn NETLINK_ROUTE
+family is intended to be the primary configuration mechanism for all
+network-related tasks.
+Currently it supports configuring interfaces, interface addresses, routes,
+nexthops and arp/ndp neighbors.
+.Sh ROUTES
+All route configuration messages share the common header:
+.Bd -literal
+struct rtmsg {
+ unsigned char rtm_family; /* address family */
+ unsigned char rtm_dst_len; /* Prefix length */
+ unsigned char rtm_src_len; /* Deprecated, set to 0 */
+ unsigned char rtm_tos; /* Type of service (not used) */
+ unsigned char rtm_table; /* deprecated, set to 0 */
+ unsigned char rtm_protocol; /* Routing protocol id (RTPROT_) */
+ unsigned char rtm_scope; /* Route distance (RT_SCOPE_) */
+ unsigned char rtm_type; /* Route type (RTN_) */
+ unsigned rtm_flags; /* Route flags (not supported) */
+};
+.Ed
+.Pp
+The
+.Fa rtm_family
+specifies the route family to be operated on.
+Currently,
+.Dv AF_INET6
+and
+.Dv AF_INET6
+are the only supported families.
+Route prefix length is stored in
+.Fa rtm_dst_len
+.
+The caller should set the originator identity (any of
+.Dv RTPROT_
+values) in
+.Fa rtm_protocol
+.
+It is useful for user and for the application itself, allowing for easy
+identification of self-originated routes.
+Route scope has to be set via
+.Fa rtm_scope
+field.
+The supported values are:
+.Bd -literal -offset indent -compact
+RT_SCOPE_UNIVERSE Global scope
+RT_SCOPE_LINK Link scope
+.Ed
+.Pp
+Route type needs to be set.
+The defined values are:
+.Bd -literal -offset indent -compact
+RTN_UNICAST Unicast route
+RTN_MULTICAST Multicast route
+RTN_BLACKHOLE Drops traffic towards destination
+RTN_PROHIBIT Drops traffic and sends reject
+.Ed
+.Pp
+The following messages are supported:
+.Ss RTM_NEWROUTE
+Adds a new route.
+All NL flags are supported.
+Extending multipath route requires NLM_F_APPEND flag.
+.Ss RTM_DELROUTE
+Tries to delete the route.
+Route is specified using combination of
+.Dv RTA_DST
+TLV and
+.Fa rtm_dst_len
+.
+.Ss RTM_GETROUTE
+Fetches a single route or all routes in the table, depending on
+.Dv NLM_F_DUMP flag
+.
+Each route is reported as
+.Dv RTM_NEWROUTE
+message.
+.Ss TLVs
+.Ss Groups
+The following groups are defined:
+.Bd -literal -offset indent -compact
+RTNLGRP_IPV4_ROUTE Notifies on IPv4 route arrival/removal/change
+RTNLGRP_IPV6_ROUTE Notifies on IPv6 route arrival/removal/change
+.Ed
+.Sh NEXTHOPS
+.Ss RTM_NEWNEXTHOP
+.Ss RTM_DELNEXTHOP
+.Ss RTM_GETNEXTHOP
+.Ss TLVs
+.Ss Groups
+The following groups are defined:
+.Bd -literal -offset indent -compact
+RTNLGRP_NEXTHOP Notifies on nexthop/groups arrival/removal/change
+.Ed
+.Sh INTERFACES
+.Ss RTM_NEWLINK
+.Ss RTM_DELLINK
+.Ss RTM_GETLINK
+.Ss TLVs
+.Ss Groups
+The following groups are defined:
+.Bd -literal -offset indent -compact
+RTNLGRP_LINK Notifies on interface arrival/removal/change
+.Ed
+.Sh INTERFACE ADDRESSES
+.Ss RTM_NEWADDR
+.Ss RTM_DELADDR
+.Ss RTM_GETADDR
+.Ss TLVs
+.Ss Groups
+The following groups are defined:
+.Bd -literal -offset indent -compact
+RTNLGRP_IPV4_IFADDR Notifies on IPv4 ifaddr arrival/removal/change
+RTNLGRP_IPV6_IFADDR Notifies on IPv6 ifaddr arrival/removal/change
+.Ed
+.Sh NEIGHBORS
+.Ss RTM_NEWNEIGH
+.Ss RTM_DELNEIGH
+.Ss RTM_GETNEIGH
+.Ss TLVs
+.Ss Groups
+The following groups are defined:
+.Bd -literal -offset indent -compact
+RTNLGRP_NEIGH Notifies on ARP/NDP neighbour arrival/removal/change
+.Ed
+.Sh SEE ALSO
+.Xr netlink 4 ,
+.Xr route 4
+.Sh HISTORY
+The
+.Tn NETLINK_ROUTE
+protocol family appeared in
+.Fx 14.0 .
+.Sh AUTHORS
+.Tn
+Netlink
+implementation was written by
+.An -nosplit
+.An Alexander Chernikov Aq Mt melifaro@FreeBSD.org .
+It was derived from the Summer of Code 2021 project by
+.An Ng Peng Nam Sean .
diff --git a/sys/modules/Makefile b/sys/modules/Makefile
--- a/sys/modules/Makefile
+++ b/sys/modules/Makefile
@@ -266,6 +266,7 @@
my \
${_nctgpio} \
${_neta} \
+ netlink \
${_netgraph} \
${_nfe} \
nfscl \
diff --git a/sys/modules/netlink/Makefile b/sys/modules/netlink/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/modules/netlink/Makefile
@@ -0,0 +1,17 @@
+.PATH: ${SRCTOP}/sys/netlink
+KMOD= netlink
+
+SRCS = netlink_module.c netlink_domain.c netlink_io.c \
+ netlink_message_parser.c netlink_message_writer.c netlink_generic.c \
+ netlink_route.c route/iface.c route/iface_drivers.c route/neigh.c \
+ route/nexthop.c route/route.c
+
+EXPORT_SYMS=
+EXPORT_SYMS+= nlmsg_get_chain_writer
+EXPORT_SYMS+= nlmsg_refill_buffer
+EXPORT_SYMS+= nlmsg_end
+EXPORT_SYMS+= nlmsg_flush
+
+EXPORT_SYMS= YES
+
+.include <bsd.kmod.mk>
diff --git a/sys/net/route.c b/sys/net/route.c
--- a/sys/net/route.c
+++ b/sys/net/route.c
@@ -694,3 +694,14 @@
return (rtsock_routemsg_info(cmd, info, fibnum));
}
+
+/* Netlink-related callbacks needed to glue rtsock, netlink and linuxolator */
+static void
+ignore_route_event(uint32_t fibnum, const struct rib_cmd_info *rc)
+{
+}
+static struct rtbridge ignore_cb = { .route_f = ignore_route_event };
+
+void *linux_netlink_p = NULL; /* Callback pointer for Linux translator functions */
+struct rtbridge *rtsock_callback_p = &ignore_cb;
+struct rtbridge *netlink_callback_p = &ignore_cb;
diff --git a/sys/net/route/route_ctl.h b/sys/net/route/route_ctl.h
--- a/sys/net/route/route_ctl.h
+++ b/sys/net/route/route_ctl.h
@@ -189,4 +189,11 @@
void rib_notify(struct rib_head *rnh, enum rib_subscription_type type,
struct rib_cmd_info *rc);
+/* Event bridge */
+typedef void route_event_f(uint32_t fibnum, const struct rib_cmd_info *rc);
+struct rtbridge{
+ route_event_f *route_f;
+};
+extern struct rtbridge *rtsock_callback_p;
+extern struct rtbridge *netlink_callback_p;
#endif
diff --git a/sys/net/rtsock.c b/sys/net/rtsock.c
--- a/sys/net/rtsock.c
+++ b/sys/net/rtsock.c
@@ -219,6 +219,7 @@
int rtm_errno);
static bool can_export_rte(struct ucred *td_ucred, bool rt_is_host,
const struct sockaddr *rt_dst);
+static void rtsock_notify_event(uint32_t fibnum, const struct rib_cmd_info *rc);
static struct netisr_handler rtsock_nh = {
.nh_name = "rtsock",
@@ -274,6 +275,45 @@
vnet_rts_uninit, 0);
#endif
+static void
+report_route_event(const struct rib_cmd_info *rc, void *_cbdata)
+{
+ uint32_t fibnum = (uint32_t)(uintptr_t)_cbdata;
+ struct nhop_object *nh;
+
+ nh = rc->rc_cmd == RTM_DELETE ? rc->rc_nh_old : rc->rc_nh_new;
+ rt_routemsg(rc->rc_cmd, rc->rc_rt, nh, fibnum);
+}
+
+static void
+rts_handle_route_event(uint32_t fibnum, const struct rib_cmd_info *rc)
+{
+#ifdef ROUTE_MPATH
+ if ((rc->rc_nh_new && NH_IS_NHGRP(rc->rc_nh_new)) ||
+ (rc->rc_nh_old && NH_IS_NHGRP(rc->rc_nh_old))) {
+ rib_decompose_notification(rc, report_route_event,
+ (void *)(uintptr_t)fibnum);
+ } else
+#endif
+ report_route_event(rc, (void *)(uintptr_t)fibnum);
+}
+static struct rtbridge rtsbridge = { .route_f = rts_handle_route_event };
+static struct rtbridge *rtsbridge_orig_p;
+
+static void
+rtsock_notify_event(uint32_t fibnum, const struct rib_cmd_info *rc)
+{
+ netlink_callback_p->route_f(fibnum, rc);
+}
+
+static void
+rtsock_init(void)
+{
+ rtsbridge_orig_p = rtsock_callback_p;
+ rtsock_callback_p = &rtsbridge;
+}
+SYSINIT(rtsock_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rtsock_init, NULL);
+
static void
rts_handle_ifnet_arrival(void *arg __unused, struct ifnet *ifp)
{
@@ -1074,6 +1114,7 @@
}
error = rib_action(fibnum, rtm->rtm_type, &info, &rc);
if (error == 0) {
+ rtsock_notify_event(fibnum, &rc);
#ifdef ROUTE_MPATH
if (NH_IS_NHGRP(rc.rc_nh_new) ||
(rc.rc_nh_old && NH_IS_NHGRP(rc.rc_nh_old))) {
@@ -1095,6 +1136,7 @@
case RTM_DELETE:
error = rib_action(fibnum, RTM_DELETE, &info, &rc);
if (error == 0) {
+ rtsock_notify_event(fibnum, &rc);
#ifdef ROUTE_MPATH
if (NH_IS_NHGRP(rc.rc_nh_old) ||
(rc.rc_nh_new && NH_IS_NHGRP(rc.rc_nh_new))) {
diff --git a/sys/netlink/netlink.h b/sys/netlink/netlink.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink.h
@@ -0,0 +1,230 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Ng Peng Nam Sean
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * This file contains structures and constants for RFC 3549 (Netlink)
+ * protocol. Some values have been taken from Linux implementation.
+ */
+
+#ifndef _NETLINK_NETLINK_H_
+#define _NETLINK_NETLINK_H_
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+struct sockaddr_nl {
+ uint8_t nl_len; /* sizeof(sockaddr_nl) */
+ sa_family_t nl_family; /* netlink family */
+ uint16_t nl_pad; /* reserved, set to 0 */
+ uint32_t nl_pid; /* desired port ID, 0 for auto-select */
+ uint32_t nl_groups; /* multicast groups mask to bind to */
+};
+
+#define SOL_NETLINK 270
+
+/* Netlink socket options */
+#define NETLINK_ADD_MEMBERSHIP 1 /* Subscribe for the specified group notifications */
+#define NETLINK_DROP_MEMBERSHIP 2 /* Unsubscribe from the specified group */
+#define NETLINK_PKTINFO 3 /* XXX: not supported */
+#define NETLINK_BROADCAST_ERROR 4 /* XXX: not supported */
+#define NETLINK_NO_ENOBUFS 5 /* XXX: not supported */
+#define NETLINK_RX_RING 6 /* XXX: not supported */
+#define NETLINK_TX_RING 7 /* XXX: not supported */
+#define NETLINK_LISTEN_ALL_NSID 8 /* XXX: not supported */
+
+#define NETLINK_LIST_MEMBERSHIPS 9
+#define NETLINK_CAP_ACK 10 /* Send only original message header in the reply */
+#define NETLINK_EXT_ACK 11 /* Ack support for receiving additional TLVs in ack */
+#define NETLINK_GET_STRICT_CHK 12 /* Strict header checking */
+
+
+/*
+ * RFC 3549, 2.3.2 Netlink Message Header
+ */
+struct nlmsghdr {
+ uint32_t nlmsg_len; /* Length of message including header */
+ uint16_t nlmsg_type; /* Message type identifier */
+ uint16_t nlmsg_flags; /* Flags (NLM_F_) */
+ uint32_t nlmsg_seq; /* Sequence number */
+ uint32_t nlmsg_pid; /* Sending process port ID */
+};
+
+/*
+ * RFC 3549, 2.3.2 standard flag bits (nlmsg_flags)
+ */
+#define NLM_F_REQUEST 0x01 /* Indicateds request to kernel */
+#define NLM_F_MULTI 0x02 /* Message is part of a group terminated by NLMSG_DONE msg */
+#define NLM_F_ACK 0x04 /* Reply with ack message containing resulting error code */
+#define NLM_F_ECHO 0x08 /* (not supported) Echo this request back */
+#define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */
+#define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */
+
+/*
+ * RFC 3549, 2.3.2 Additional flag bits for GET requests
+ */
+#define NLM_F_ROOT 0x100 /* Return the complete table */
+#define NLM_F_MATCH 0x200 /* Return all entries matching criteria */
+#define NLM_F_ATOMIC 0x400 /* Return an atomic snapshot (ignored) */
+#define NLM_F_DUMP (NLM_F_ROOT | NLM_F_MATCH)
+
+/*
+ * RFC 3549, 2.3.2 Additional flag bits for NEW requests
+ */
+#define NLM_F_REPLACE 0x100 /* Replace existing matching config object */
+#define NLM_F_EXCL 0x200 /* Don't replace the object if exists */
+#define NLM_F_CREATE 0x400 /* Create if it does not exist */
+#define NLM_F_APPEND 0x800 /* Add to end of list */
+
+/* Modifiers to DELETE requests */
+#define NLM_F_NONREC 0x100 /* Do not delete recursively */
+
+/* Flags for ACK message */
+#define NLM_F_CAPPED 0x100 /* request was capped */
+#define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */
+
+/*
+ * RFC 3549, 2.3.2 standard message types (nlmsg_type).
+ */
+#define NLMSG_NOOP 0x1 /* Message is ignored. */
+#define NLMSG_ERROR 0x2 /* reply error code reporting */
+#define NLMSG_DONE 0x3 /* Message terminates a multipart message. */
+#define NLMSG_OVERRUN 0x4 /* overrun detected, data is lost */
+
+#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
+
+/*
+ * Defition of numbers assigned to the netlink subsystems.
+ */
+#define NETLINK_ROUTE 0 /* Routing/device hook */
+#define NETLINK_UNUSED 1 /* not supported */
+#define NETLINK_USERSOCK 2 /* not supported */
+#define NETLINK_FIREWALL 3 /* not supported */
+#define NETLINK_SOCK_DIAG 4 /* not supported */
+#define NETLINK_NFLOG 5 /* not supported */
+#define NETLINK_XFRM 6 /* (not supported) PF_SETKEY */
+#define NETLINK_SELINUX 7 /* not supported */
+#define NETLINK_ISCSI 8 /* not supported */
+#define NETLINK_AUDIT 9 /* not supported */
+#define NETLINK_FIB_LOOKUP 10 /* not supported */
+#define NETLINK_CONNECTOR 11 /* not supported */
+#define NETLINK_NETFILTER 12 /* not supported */
+#define NETLINK_IP6_FW 13 /* not supported */
+#define NETLINK_DNRTMSG 14 /* not supported */
+#define NETLINK_KOBJECT_UEVENT 15 /* not supported */
+#define NETLINK_GENERIC 16 /* Generic netlink (dynamic families) */
+
+/*
+ * RFC 3549, 2.3.2.2 The ACK Netlink Message
+ */
+struct nlmsgerr {
+ int error;
+ struct nlmsghdr msg;
+};
+
+enum nlmsgerr_attrs {
+ NLMSGERR_ATTR_UNUSED,
+ NLMSGERR_ATTR_MSG = 1, /* string, error message */
+ NLMSGERR_ATTR_OFFS = 2, /* u32, offset of the invalid attr from nl header */
+ NLMSGERR_ATTR_COOKIE = 3, /* binary, data to pass to userland */
+ NLMSGERR_ATTR_POLICY = 4, /* not supported */
+ __NLMSGERR_ATTR_MAX,
+ NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
+};
+
+
+#ifndef roundup2
+#define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
+#endif
+#define NL_ITEM_ALIGN_SIZE sizeof(uint32_t)
+#define NL_ITEM_ALIGN(_len) roundup2(_len, NL_ITEM_ALIGN_SIZE)
+#define NL_ITEM_DATA(_ptr, _off) ((void *)((char *)(_ptr) + _off))
+#define NL_ITEM_DATA_CONST(_ptr, _off) ((const void *)((const char *)(_ptr) + _off))
+
+#define NL_ITEM_OK(_ptr, _len, _hlen, _LEN_M) \
+ ((_len) >= _hlen && _LEN_M(_ptr) >= _hlen && _LEN_M(_ptr) <= (_len))
+#define NL_ITEM_NEXT(_ptr, _LEN_M) ((typeof(_ptr))((char *)(_ptr) + _LEN_M(_ptr)))
+#define NL_ITEM_ITER(_ptr, _len, _LEN_MACRO) \
+ ((_len) -= _LEN_MACRO(_ptr), NL_ITEM_NEXT(_ptr, _LEN_MACRO))
+
+
+#ifndef _KERNEL
+/* part of netlink(3) API */
+#define NLMSG_ALIGNTO NL_ITEM_ALIGN_SIZE
+#define NLMSG_ALIGN(_len) NL_ITEM_ALIGN(_len)
+#define NLMSG_HDRLEN ((int)sizeof(struct nlmsghdr))
+#define NLMSG_LENGTH(_len) ((_len) + NLMSG_HDRLEN)
+#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(_len))
+#define NLMSG_DATA(_hdr) NL_ITEM_DATA(_hdr, NLMSG_HDRLEN)
+#define _NLMSG_LEN(_hdr) ((int)(_hdr)->nlmsg_len)
+#define _NLMSG_ALIGNED_LEN(_hdr) NLMSG_ALIGN(_NLMSG_LEN(_hdr))
+#define NLMSG_OK(_hdr, _len) NL_ITEM_OK(_hdr, _len, NLMSG_HDRLEN, _NLMSG_LEN)
+#define NLMSG_PAYLOAD(_hdr,_len) (_NLMSG_LEN(_hdr) - NLMSG_SPACE((_len)))
+#define NLMSG_NEXT(_hdr, _len) NL_ITEM_ITER(_hdr, _len, _NLMSG_ALIGNED_LEN)
+
+#else
+#define NLMSG_ALIGNTO 4U
+#define NLMSG_ALIGN(len) (((len) + NLMSG_ALIGNTO - 1) & ~(NLMSG_ALIGNTO - 1))
+#define NLMSG_HDRLEN ((int)NLMSG_ALIGN(sizeof(struct nlmsghdr)))
+#endif
+
+/*
+ * Base netlink attribute TLV header.
+ */
+struct nlattr {
+ uint16_t nla_len; /* Total attribute length */
+ uint16_t nla_type; /* Attribute type */
+};
+
+/*
+ *
+ * nl_type field enconding:
+ *
+ * 0 1
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |N|O| Attribute type |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * N - attribute contains other attributes (mostly unused)
+ * O - encoded in network byte order (mostly unused)
+ * Note: N & O are mutually exclusive
+ *
+ * Note: attribute type value scope normally is either parent attribute
+ * or the message/message group.
+ */
+
+#define NLA_F_NESTED (1 << 15)
+#define NLA_F_NET_BYTEORDER (1 << 14)
+#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
+
+#ifndef _KERNEL
+#define NLA_ALIGNTO NL_ITEM_ALIGN_SIZE
+#define NLA_ALIGN(_len) NL_ITEM_ALIGN(_len)
+#define NLA_HDRLEN ((int)sizeof(struct nlattr))
+#endif
+
+#endif
diff --git a/sys/netlink/netlink_ctl.h b/sys/netlink/netlink_ctl.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_ctl.h
@@ -0,0 +1,102 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _NETLINK_NETLINK_CTL_H_
+#define _NETLINK_NETLINK_CTL_H_
+
+/*
+ * This file provides headers for the public KPI of the netlink
+ * subsystem
+ */
+
+MALLOC_DECLARE(M_NETLINK);
+
+/*
+ * Macro for handling attribute TLVs
+ */
+#define _roundup2(x, y) (((x)+((y)-1))&(~((y)-1)))
+
+#define NETLINK_ALIGN_SIZE sizeof(uint32_t)
+#define NETLINK_ALIGN(_len) _roundup2(_len, NETLINK_ALIGN_SIZE)
+
+#define NLA_ALIGN_SIZE sizeof(uint32_t)
+#define NLA_ALIGN(_len) _roundup2(_len, NLA_ALIGN_SIZE)
+#define NLA_HDRLEN ((int)sizeof(struct nlattr))
+#define NLA_DATA_LEN(_nla) ((int)((_nla)->nla_len - NLA_HDRLEN))
+#define NLA_DATA(_nla) NL_ITEM_DATA(_nla, NLA_HDRLEN)
+#define NLA_DATA_CONST(_nla) NL_ITEM_DATA_CONST(_nla, NLA_HDRLEN)
+#define NLA_TYPE(_nla) ((_nla)->nla_type & 0x3FFF)
+
+#ifndef typeof
+#define typeof __typeof
+#endif
+
+#define NLA_NEXT(_attr) (struct nlattr *)((char *)_attr + NLA_ALIGN(_attr->nla_len))
+#define _NLA_END(_start, _len) ((char *)(_start) + (_len))
+#define NLA_FOREACH(_attr, _start, _len) \
+ for (typeof(_attr) _end = (typeof(_attr))_NLA_END(_start, _len), _attr = (_start); \
+ ((char *)_attr < (char *)_end) && \
+ ((char *)NLA_NEXT(_attr) <= (char *)_end); \
+ _attr = (_len -= NLA_ALIGN(_attr->nla_len), NLA_NEXT(_attr)))
+
+#define NL_ARRAY_LEN(_a) (sizeof(_a) / sizeof((_a)[0]))
+
+#include <netlink/netlink_message_writer.h>
+#include <netlink/netlink_message_parser.h>
+
+
+/* Protocol handlers */
+struct nl_pstate;
+typedef int (*nl_handler_f)(struct nlmsghdr *hdr, struct nl_pstate *npt);
+
+bool netlink_register_proto(int proto, const char *proto_name, nl_handler_f handler);
+bool netlink_unregister_proto(int proto);
+
+/* Common helpers */
+bool nl_has_listeners(int netlink_family, uint32_t groups_mask);
+bool nlp_has_priv(struct nlpcb *nlp, int priv);
+
+/* netlink_generic.c */
+struct genl_cmd {
+ const char *cmd_name;
+ nl_handler_f cmd_cb;
+ uint32_t cmd_flags;
+ uint32_t cmd_priv;
+ uint32_t cmd_num;
+};
+
+uint32_t genl_register_family(const char *family_name, size_t hdrsize,
+ int family_version, int max_attr_idx);
+bool genl_unregister_family(const char *family_name);
+bool genl_register_cmds(const char *family_name, const struct genl_cmd *cmds,
+ int count);
+uint32_t genl_register_group(const char *family_name, const char *group_name);
+
+/* Debug */
+uint32_t nlp_get_pid(const struct nlpcb *nlp);
+
+#endif
diff --git a/sys/netlink/netlink_debug.h b/sys/netlink/netlink_debug.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_debug.h
@@ -0,0 +1,82 @@
+/*-
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _NETLINK_NETLINK_DEBUG_H_
+#define _NETLINK_NETLINK_DEBUG_H_
+
+#define _DEBUG_SYSCTL_OID _net_netlink_debug
+#include <net/route/route_debug.h>
+
+SYSCTL_DECL(_net_netlink_debug);
+
+/*
+ * Generic debug
+ * [nl_domain] func_name: debug text
+ */
+#define NL_LOG RT_LOG
+
+/*
+ * Logging for events specific for particular process
+ * Example: [nl_domain] PID 4834 fdump_sa: unsupported family: 45
+ */
+#define NL_RAW_PID_LOG(_l, _pid, _fmt, ...) NL_RAW_PID_LOG_##_l(_l, _pid, _fmt, ## __VA_ARGS__)
+#define _NL_RAW_PID_LOG(_l, _pid, _fmt, ...) if (_DEBUG_PASS_MSG(_l)) { \
+ _output("[" DEBUG_PREFIX_NAME "] PID %u %s: " _fmt "\n", _pid, __func__, ##__VA_ARGS__); \
+}
+
+#define NLP_LOG(_l, _nlp, _fmt, ...) NL_RAW_PID_LOG_##_l(_l, nlp_get_pid(_nlp), _fmt, ## __VA_ARGS__)
+
+#if DEBUG_MAX_LEVEL>=LOG_DEBUG3
+#define NL_RAW_PID_LOG_LOG_DEBUG3 _NL_RAW_PID_LOG
+#else
+#define NL_RAW_PID_LOG_LOG_DEBUG3(_l, _pid, _fmt, ...)
+#endif
+#if DEBUG_MAX_LEVEL>=LOG_DEBUG2
+#define NL_RAW_PID_LOG_LOG_DEBUG2 _NL_RAW_PID_LOG
+#else
+#define NL_RAW_PID_LOG_LOG_DEBUG2(_l, _pid, _fmt, ...)
+#endif
+#if DEBUG_MAX_LEVEL>=LOG_DEBUG
+#define NL_RAW_PID_LOG_LOG_DEBUG _NL_RAW_PID_LOG
+#else
+#define NL_RAW_PID_LOG_LOG_DEBUG(_l, _pid, _fmt, ...)
+#endif
+#if DEBUG_MAX_LEVEL>=LOG_INFO
+#define NL_RAW_PID_LOG_LOG_INFO _NL_RAW_PID_LOG
+#else
+#define NL_RAW_PID_LOG_LOG_INFO(_l, _pid, _fmt, ...)
+#endif
+#define NL_RAW_PID_LOG_LOG_NOTICE _NL_RAW_PID_LOG
+#define NL_RAW_PID_LOG_LOG_ERR _NL_RAW_PID_LOG
+#define NL_RAW_PID_LOG_LOG_WARNING _NL_RAW_PID_LOG
+
+
+
+#endif
diff --git a/sys/netlink/netlink_domain.c b/sys/netlink/netlink_domain.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_domain.c
@@ -0,0 +1,688 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Ng Peng Nam Sean
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * This file contains socket and protocol bindings for netlink.
+ */
+
+#include <sys/param.h>
+#include <sys/malloc.h>
+#include <sys/lock.h>
+#include <sys/rmlock.h>
+#include <sys/domain.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/ck.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/sysent.h>
+#include <sys/syslog.h>
+#include <sys/priv.h> /* priv_check */
+
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_var.h>
+
+#define DEBUG_MOD_NAME nl_domain
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG);
+
+
+#define NLCTL_TRACKER struct rm_priotracker nl_tracker
+#define NLCTL_RLOCK(_ctl) rm_rlock(&((_ctl)->ctl_lock), &nl_tracker)
+#define NLCTL_RUNLOCK(_ctl) rm_runlock(&((_ctl)->ctl_lock), &nl_tracker)
+
+#define NLCTL_WLOCK(_ctl) rm_wlock(&((_ctl)->ctl_lock))
+#define NLCTL_WUNLOCK(_ctl) rm_wunlock(&((_ctl)->ctl_lock))
+
+static u_long nl_sendspace = NLSNDQ;
+SYSCTL_ULONG(_net_netlink, OID_AUTO, sendspace, CTLFLAG_RW, &nl_sendspace, 0,
+ "Default netlink socket send space");
+
+static u_long nl_recvspace = NLSNDQ;
+SYSCTL_ULONG(_net_netlink, OID_AUTO, recvspace, CTLFLAG_RW, &nl_recvspace, 0,
+ "Default netlink socket receive space");
+
+extern u_long sb_max_adj;
+static u_long nl_maxsockbuf = 512 * 1024 * 1024; /* 512M, XXX: init based on physmem */
+
+uint32_t
+nlp_get_pid(const struct nlpcb *nlp)
+{
+ return (nlp->nl_process_id);
+}
+
+/*
+ * Looks up a nlpcb struct based on the @portid. Need to claim nlsock_mtx.
+ * Returns nlpcb pointer if present else NULL
+ */
+static struct nlpcb *
+nl_port_lookup(uint32_t port_id)
+{
+ struct nlpcb *nlp;
+
+ CK_LIST_FOREACH(nlp, &V_nl_ctl->ctl_port_head, nl_port_next) {
+ if (nlp->nl_port == port_id)
+ return (nlp);
+ }
+ return (NULL);
+}
+
+static void
+nl_update_groups_locked(struct nlpcb *nlp, uint64_t nl_groups)
+{
+ /* Update group mask */
+ NL_LOG(LOG_DEBUG2, "socket %p, groups 0x%lX -> 0x%lX",
+ nlp->nl_socket, nlp->nl_groups, nl_groups);
+ nlp->nl_groups = nl_groups;
+}
+
+/*
+ * Broadcasts message @m to the protocol @proto group specified by @group_id
+ */
+void
+nl_send_group(struct mbuf *m, int num_messages, int proto, int group_id)
+{
+ struct nlpcb *nlp_last = NULL;
+ struct nlpcb *nlp;
+ NLCTL_TRACKER;
+
+ IF_DEBUG_LEVEL(LOG_DEBUG2) {
+ struct nlmsghdr *hdr = mtod(m, struct nlmsghdr *);
+ NL_LOG(LOG_DEBUG2, "MCAST mbuf len %u msg type %d len %u to group %d/%d",
+ m->m_len, hdr->nlmsg_type, hdr->nlmsg_len, proto, group_id);
+ }
+
+ struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl);
+ if (__predict_false(ctl == NULL)) {
+ /*
+ * Can be the case when notification is sent within VNET
+ * which doesn't have any netlink sockets.
+ */
+ m_freem(m);
+ return;
+ }
+
+ NLCTL_RLOCK(ctl);
+
+ int io_flags = NL_IOF_UNTRANSLATED;
+ uint64_t groups_mask = 1 << ((uint64_t)group_id - 1);
+
+ CK_LIST_FOREACH(nlp, &ctl->ctl_pcb_head, nl_next) {
+ if (nlp->nl_groups & groups_mask && nlp->nl_proto == proto) {
+ if (nlp_last != NULL) {
+ struct mbuf *m_copy;
+ m_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
+ if (m_copy != NULL)
+ nl_send_one(m_copy, nlp_last, num_messages, io_flags);
+ else {
+ NLP_LOCK(nlp_last);
+ if (nlp_last->nl_socket != NULL)
+ sorwakeup(nlp_last->nl_socket);
+ NLP_UNLOCK(nlp_last);
+ }
+ }
+ nlp_last = nlp;
+ }
+ }
+ if (nlp_last != NULL)
+ nl_send_one(m, nlp_last, num_messages, io_flags);
+ else
+ m_freem(m);
+
+ NLCTL_RUNLOCK(ctl);
+}
+
+bool
+nl_has_listeners(int netlink_family, uint32_t groups_mask)
+{
+ return (V_nl_ctl != NULL);
+}
+
+bool
+nlp_has_priv(struct nlpcb *nlp, int priv)
+{
+ return (priv_check_cred(nlp->nl_cred, priv) == 0);
+}
+
+static uint32_t
+nl_find_port() {
+ /*
+ * app can open multiple netlink sockets.
+ * Start with current pid, if already taken,
+ * try random numbers in 65k..256k+65k space,
+ * avoiding clash with pids.
+ */
+ if (nl_port_lookup(curproc->p_pid) == NULL)
+ return (curproc->p_pid);
+ for (int i = 0; i < 16; i++) {
+ uint32_t nl_port = (arc4random() % 65536) + 65536 * 4;
+ if (nl_port_lookup(nl_port) == 0)
+ return (nl_port);
+ NL_LOG(LOG_DEBUG3, "tried %u\n", nl_port);
+ }
+ return (curproc->p_pid);
+}
+
+static int
+nl_bind_locked(struct nlpcb *nlp, struct sockaddr_nl *snl)
+{
+ if (nlp->nl_bound) {
+ if (nlp->nl_port != snl->nl_pid) {
+ NL_LOG(LOG_DEBUG,
+ "bind() failed: program pid %d "
+ "is different from provided pid %d",
+ nlp->nl_port, snl->nl_pid);
+ return (EINVAL); // XXX: better error
+ }
+ } else {
+ if (snl->nl_pid == 0)
+ snl->nl_pid = nl_find_port();
+ if (nl_port_lookup(snl->nl_pid) != NULL)
+ return (EADDRINUSE);
+ nlp->nl_port = snl->nl_pid;
+ nlp->nl_bound = true;
+ CK_LIST_INSERT_HEAD(&V_nl_ctl->ctl_port_head, nlp, nl_port_next);
+ }
+ nl_update_groups_locked(nlp, snl->nl_groups);
+
+ return (0);
+}
+
+static int
+nl_pru_attach(struct socket *so, int proto, struct thread *td)
+{
+ struct nlpcb *nlp;
+ int error;
+
+ if (__predict_false(netlink_unloading != 0))
+ return (EAFNOSUPPORT);
+
+ error = nl_verify_proto(proto);
+ if (error != 0)
+ return (error);
+
+ bool is_linux = SV_PROC_ABI(td->td_proc) == SV_ABI_LINUX;
+ NL_LOG(LOG_DEBUG2, "socket %p, %sPID %d: attaching socket to %s",
+ so, is_linux ? "(linux) " : "", curproc->p_pid,
+ nl_get_proto_name(proto));
+
+ /* Create per-VNET state on first socket init */
+ struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl);
+ if (ctl == NULL)
+ ctl = vnet_nl_ctl_init();
+ KASSERT(V_nl_ctl != NULL, ("nl_attach: vnet_sock_init() failed"));
+
+ MPASS(sotonlpcb(so) == NULL);
+
+ nlp = malloc(sizeof(struct nlpcb), M_PCB, M_WAITOK | M_ZERO);
+ error = soreserve(so, nl_sendspace, nl_recvspace);
+ if (error != 0) {
+ free(nlp, M_PCB);
+ return (error);
+ }
+ so->so_pcb = nlp;
+ nlp->nl_socket = so;
+ /* Copy so_cred to avoid having socket_var.h in every header */
+ nlp->nl_cred = so->so_cred;
+ nlp->nl_proto = proto;
+ nlp->nl_process_id = curproc->p_pid;
+ nlp->nl_linux = is_linux;
+ nlp->nl_active = true;
+ NLP_LOCK_INIT(nlp);
+ refcount_init(&nlp->nl_refcount, 1);
+
+ nlp->nl_taskqueue = taskqueue_create("netlink_socket", M_WAITOK,
+ taskqueue_thread_enqueue, &nlp->nl_taskqueue);
+ TASK_INIT(&nlp->nl_task, 0, nl_taskqueue_handler, nlp);
+ taskqueue_start_threads(&nlp->nl_taskqueue, 1, PWAIT,
+ "netlink_socket (PID %u)", nlp->nl_process_id);
+
+ NLCTL_WLOCK(ctl);
+ /* XXX: check ctl is still alive */
+ CK_LIST_INSERT_HEAD(&ctl->ctl_pcb_head, nlp, nl_next);
+ NLCTL_WUNLOCK(ctl);
+
+ soisconnected(so);
+
+ return (0);
+}
+
+static void
+nl_pru_abort(struct socket *so)
+{
+ NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid);
+ MPASS(sotonlpcb(so) != NULL);
+ soisdisconnected(so);
+}
+
+static int
+nl_pru_bind(struct socket *so, struct sockaddr *sa, struct thread *td)
+{
+ struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl);
+ struct nlpcb *nlp = sotonlpcb(so);
+ struct sockaddr_nl *snl = (struct sockaddr_nl *)sa;
+ int error;
+
+ NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid);
+ if (snl->nl_len != sizeof(*snl)) {
+ NL_LOG(LOG_DEBUG, "socket %p, wrong sizeof(), ignoring bind()", so);
+ return (EINVAL);
+ }
+
+
+ NLCTL_WLOCK(ctl);
+ NLP_LOCK(nlp);
+ error = nl_bind_locked(nlp, snl);
+ NLP_UNLOCK(nlp);
+ NLCTL_WUNLOCK(ctl);
+ NL_LOG(LOG_DEBUG2, "socket %p, bind() to %u, groups %u, error %d", so,
+ snl->nl_pid, snl->nl_groups, error);
+
+ return (error);
+}
+
+
+static int
+nl_assign_port(struct nlpcb *nlp, uint32_t port_id)
+{
+ struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl);
+ struct sockaddr_nl snl = {
+ .nl_pid = port_id,
+ };
+ int error;
+
+ NLCTL_WLOCK(ctl);
+ NLP_LOCK(nlp);
+ snl.nl_groups = nlp->nl_groups;
+ error = nl_bind_locked(nlp, &snl);
+ NLP_UNLOCK(nlp);
+ NLCTL_WUNLOCK(ctl);
+
+ NL_LOG(LOG_DEBUG3, "socket %p, port assign: %d, error: %d", nlp->nl_socket, port_id, error);
+ return (error);
+}
+
+/*
+ * nl_autobind_port binds a unused portid to @nlp
+ * @nlp: pcb data for the netlink socket
+ * @candidate_id: first id to consider
+ */
+static int
+nl_autobind_port(struct nlpcb *nlp, uint32_t candidate_id)
+{
+ struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl);
+ uint32_t port_id = candidate_id;
+ NLCTL_TRACKER;
+ bool exist;
+ int error;
+
+ for (int i = 0; i < 10; i++) {
+ NL_LOG(LOG_DEBUG3, "socket %p, trying to assign port %d", nlp->nl_socket, port_id);
+ NLCTL_RLOCK(ctl);
+ exist = nl_port_lookup(port_id) != 0;
+ NLCTL_RUNLOCK(ctl);
+ if (!exist) {
+ error = nl_assign_port(nlp, port_id);
+ if (error != EADDRINUSE)
+ break;
+ }
+ port_id++;
+ }
+ NL_LOG(LOG_DEBUG3, "socket %p, autobind to %d, error: %d", nlp->nl_socket, port_id, error);
+ return (error);
+}
+
+static int
+nl_pru_connect(struct socket *so, struct sockaddr *sa, struct thread *td)
+{
+ struct sockaddr_nl *snl = (struct sockaddr_nl *)sa;
+ struct nlpcb *nlp;
+
+ NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid);
+ if (snl->nl_len != sizeof(*snl)) {
+ NL_LOG(LOG_DEBUG, "socket %p, wrong sizeof(), ignoring bind()", so);
+ return (EINVAL);
+ }
+
+ nlp = sotonlpcb(so);
+ if (!nlp->nl_bound) {
+ int error = nl_autobind_port(nlp, td->td_proc->p_pid);
+ if (error != 0) {
+ NL_LOG(LOG_DEBUG, "socket %p, nl_autobind() failed: %d", so, error);
+ return (error);
+ }
+ }
+ /* XXX: Handle socket flags & multicast */
+ soisconnected(so);
+
+ NL_LOG(LOG_DEBUG2, "socket %p, connect to %u", so, snl->nl_pid);
+
+ return (0);
+}
+
+static void
+destroy_nlpcb(struct nlpcb *nlp)
+{
+ NLP_LOCK(nlp);
+ nl_free_io(nlp);
+ NLP_LOCK_DESTROY(nlp);
+ free(nlp, M_PCB);
+}
+
+static void
+destroy_nlpcb_epoch(epoch_context_t ctx)
+{
+ struct nlpcb *nlp;
+
+ nlp = __containerof(ctx, struct nlpcb, nl_epoch_ctx);
+
+ destroy_nlpcb(nlp);
+}
+
+
+static void
+nl_pru_detach(struct socket *so)
+{
+ struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl);
+ MPASS(sotonlpcb(so) != NULL);
+ struct nlpcb *nlp;
+
+ NL_LOG(LOG_DEBUG2, "detaching socket %p, PID %d", so, curproc->p_pid);
+ nlp = sotonlpcb(so);
+
+ /* Mark as inactive so no new work can be enqueued */
+ NLP_LOCK(nlp);
+ bool was_bound = nlp->nl_bound;
+ nlp->nl_active = false;
+ NLP_UNLOCK(nlp);
+
+ /* Wait till all scheduled work has been completed */
+ taskqueue_drain_all(nlp->nl_taskqueue);
+ taskqueue_free(nlp->nl_taskqueue);
+
+ NLCTL_WLOCK(ctl);
+ NLP_LOCK(nlp);
+ if (was_bound) {
+ CK_LIST_REMOVE(nlp, nl_port_next);
+ NL_LOG(LOG_DEBUG3, "socket %p, unlinking bound pid %u", so, nlp->nl_port);
+ }
+ CK_LIST_REMOVE(nlp, nl_next);
+ nlp->nl_socket = NULL;
+ NLP_UNLOCK(nlp);
+ NLCTL_WUNLOCK(ctl);
+
+ so->so_pcb = NULL;
+
+ NL_LOG(LOG_DEBUG3, "socket %p, detached", so);
+
+ /* XXX: is delayed free needed? */
+ epoch_call(net_epoch_preempt, destroy_nlpcb_epoch, &nlp->nl_epoch_ctx);
+}
+
+static int
+nl_pru_disconnect(struct socket *so)
+{
+ NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid);
+ MPASS(sotonlpcb(so) != NULL);
+ return (ENOTCONN);
+}
+
+static int
+nl_pru_peeraddr(struct socket *so, struct sockaddr **sa)
+{
+ NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid);
+ MPASS(sotonlpcb(so) != NULL);
+ return (ENOTCONN);
+}
+
+static int
+nl_pru_shutdown(struct socket *so)
+{
+ NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid);
+ MPASS(sotonlpcb(so) != NULL);
+ socantsendmore(so);
+ return (0);
+}
+
+static int
+nl_pru_sockaddr(struct socket *so, struct sockaddr **sa)
+{
+ struct sockaddr_nl *snl;
+
+ snl = malloc(sizeof(struct sockaddr_nl), M_SONAME, M_WAITOK | M_ZERO);
+ /* TODO: set other fields */
+ snl->nl_len = sizeof(struct sockaddr_nl);
+ snl->nl_family = AF_NETLINK;
+ snl->nl_pid = sotonlpcb(so)->nl_port;
+ *sa = (struct sockaddr *)snl;
+ return (0);
+}
+
+static void
+nl_pru_close(struct socket *so)
+{
+ NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid);
+ MPASS(sotonlpcb(so) != NULL);
+ soisdisconnected(so);
+}
+
+static int
+nl_pru_output(struct mbuf *m, struct socket *so, ...)
+{
+
+ if (__predict_false(m == NULL ||
+ ((m->m_len < sizeof(struct nlmsghdr)) &&
+ (m = m_pullup(m, sizeof(struct nlmsghdr))) == NULL)))
+ return (ENOBUFS);
+ MPASS((m->m_flags & M_PKTHDR) != 0);
+
+ NL_LOG(LOG_DEBUG3, "sending message to kernel async processing");
+ nl_receive_async(m, so);
+ return (0);
+}
+
+
+static int
+nl_pru_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *sa,
+ struct mbuf *control, struct thread *td)
+{
+ NL_LOG(LOG_DEBUG2, "sending message to kernel");
+
+ if (__predict_false(control != NULL)) {
+ if (control->m_len) {
+ m_freem(control);
+ return (EINVAL);
+ }
+ m_freem(control);
+ }
+
+ return (nl_pru_output(m, so));
+}
+
+static int
+nl_pru_rcvd(struct socket *so, int flags)
+{
+ NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid);
+ MPASS(sotonlpcb(so) != NULL);
+
+ nl_on_transmit(sotonlpcb(so));
+
+ return (0);
+}
+
+static int
+nl_getoptflag(int sopt_name)
+{
+ switch (sopt_name) {
+ case NETLINK_CAP_ACK:
+ return (NLF_CAP_ACK);
+ case NETLINK_EXT_ACK:
+ return (NLF_EXT_ACK);
+ case NETLINK_GET_STRICT_CHK:
+ return (NLF_STRICT);
+ }
+
+ return (0);
+}
+
+static int
+nl_ctloutput(struct socket *so, struct sockopt *sopt)
+{
+ struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl);
+ struct nlpcb *nlp = sotonlpcb(so);
+ uint32_t flag;
+ uint64_t groups, group_mask;
+ int optval, error = 0;
+ NLCTL_TRACKER;
+
+ NL_LOG(LOG_DEBUG2, "%ssockopt(%p, %d)", (sopt->sopt_dir) ? "set" : "get",
+ so, sopt->sopt_name);
+
+ switch (sopt->sopt_dir) {
+ case SOPT_SET:
+ switch (sopt->sopt_name) {
+ case NETLINK_ADD_MEMBERSHIP:
+ case NETLINK_DROP_MEMBERSHIP:
+ sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval));
+ if (optval <= 0 || optval >= 64) {
+ error = ERANGE;
+ break;
+ }
+ group_mask = (uint64_t)1 << (optval - 1);
+ NL_LOG(LOG_DEBUG2, "ADD/DEL group %d mask (%lX)", optval, group_mask);
+
+ NLCTL_WLOCK(ctl);
+ if (sopt->sopt_name == NETLINK_ADD_MEMBERSHIP)
+ groups = nlp->nl_groups | group_mask;
+ else
+ groups = nlp->nl_groups & ~group_mask;
+ nl_update_groups_locked(nlp, groups);
+ NLCTL_WUNLOCK(ctl);
+ break;
+ case NETLINK_CAP_ACK:
+ case NETLINK_EXT_ACK:
+ case NETLINK_GET_STRICT_CHK:
+ sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval));
+
+ flag = nl_getoptflag(sopt->sopt_name);
+
+ NLCTL_WLOCK(ctl);
+ if (optval != 0)
+ nlp->nl_flags |= flag;
+ else
+ nlp->nl_flags &= ~flag;
+ NLCTL_WUNLOCK(ctl);
+ break;
+ default:
+ error = ENOPROTOOPT;
+ }
+ break;
+ case SOPT_GET:
+ switch (sopt->sopt_name) {
+ case NETLINK_LIST_MEMBERSHIPS:
+ NLCTL_RLOCK(ctl);
+ optval = nlp->nl_groups;
+ NLCTL_RUNLOCK(ctl);
+ error = sooptcopyout(sopt, &optval, sizeof(optval));
+ break;
+ case NETLINK_CAP_ACK:
+ case NETLINK_EXT_ACK:
+ case NETLINK_GET_STRICT_CHK:
+ NLCTL_RLOCK(ctl);
+ optval = (nlp->nl_flags & nl_getoptflag(sopt->sopt_name)) != 0;
+ NLCTL_RUNLOCK(ctl);
+ error = sooptcopyout(sopt, &optval, sizeof(optval));
+ break;
+ default:
+ error = ENOPROTOOPT;
+ }
+ break;
+ default:
+ error = ENOPROTOOPT;
+ }
+
+ return (error);
+}
+
+static int
+nl_setsbopt(struct socket *so, struct sockopt *sopt)
+{
+ int error, optval;
+ bool result;
+
+ if (sopt->sopt_name != SO_RCVBUF)
+ return (sbsetopt(so, sopt));
+
+ /* Allow to override max buffer size in certain conditions */
+
+ error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
+ if (error != 0)
+ return (error);
+ NL_LOG(LOG_DEBUG2, "socket %p, PID %d, SO_RCVBUF=%d", so, curproc->p_pid, optval);
+ if (optval > sb_max_adj) {
+ if (priv_check(curthread, PRIV_NET_ROUTE) != 0)
+ return (EPERM);
+ }
+
+ SOCK_RECVBUF_LOCK(so);
+ result = sbreserve_locked_limit(so, SO_RCV, optval, nl_maxsockbuf, curthread);
+ SOCK_RECVBUF_UNLOCK(so);
+
+ return (result ? 0 : ENOBUFS);
+}
+
+static struct protosw netlinksw = {
+ .pr_type = SOCK_RAW,
+ .pr_flags = PR_ATOMIC | PR_ADDR | PR_WANTRCVD,
+ .pr_ctloutput = nl_ctloutput,
+ .pr_setsbopt = nl_setsbopt,
+ .pr_abort = nl_pru_abort,
+ .pr_attach = nl_pru_attach,
+ .pr_bind = nl_pru_bind,
+ .pr_connect = nl_pru_connect,
+ .pr_detach = nl_pru_detach,
+ .pr_disconnect = nl_pru_disconnect,
+ .pr_peeraddr = nl_pru_peeraddr,
+ .pr_send = nl_pru_send,
+ .pr_rcvd = nl_pru_rcvd,
+ .pr_shutdown = nl_pru_shutdown,
+ .pr_sockaddr = nl_pru_sockaddr,
+ .pr_close = nl_pru_close
+};
+
+static struct domain netlinkdomain = {
+ .dom_family = PF_NETLINK,
+ .dom_name = "netlink",
+ .dom_flags = DOMF_UNLOADABLE,
+ .dom_nprotosw = 1,
+ .dom_protosw = { &netlinksw },
+};
+
+DOMAIN_SET(netlink);
diff --git a/sys/netlink/netlink_generic.h b/sys/netlink/netlink_generic.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_generic.h
@@ -0,0 +1,112 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Generic netlink message header and attributes
+ */
+#ifndef _NETLINK_NETLINK_GENERIC_H_
+#define _NETLINK_NETLINK_GENERIC_H_
+
+/* Base header for all of the relevant messages */
+struct genlmsghdr {
+ uint8_t cmd; /* CTRL_CMD_ */
+ uint8_t version; /* ABI version for the cmd */
+ uint16_t reserved; /* reserved: set to 0 */
+};
+#define GENL_HDRLEN NL_ITEM_ALIGN(sizeof(struct genlmsghdr))
+
+/* Dynamic family number range, inclusive */
+#define GENL_MIN_ID NLMSG_MIN_TYPE
+#define GENL_MAX_ID 1023
+
+/* Pre-defined family numbers */
+#define GENL_ID_CTRL GENL_MIN_ID
+
+/* Available commands */
+enum {
+ CTRL_CMD_UNSPEC = 0,
+ CTRL_CMD_NEWFAMILY = 1,
+ CTRL_CMD_DELFAMILY = 2,
+ CTRL_CMD_GETFAMILY = 3, /* lists all (or matching) genetlink families */
+ CTRL_CMD_NEWOPS = 4,
+ CTRL_CMD_DELOPS = 5,
+ CTRL_CMD_GETOPS = 6,
+ CTRL_CMD_NEWMCAST_GRP = 7,
+ CTRL_CMD_DELMCAST_GRP = 8,
+ CTRL_CMD_GETMCAST_GRP = 9,
+ CTRL_CMD_GETPOLICY = 10,
+ __CTRL_CMD_MAX,
+};
+#define CTRL_CMD_MAX (__CTRL_CMD_MAX - 1)
+
+/* Generic attributes */
+enum {
+ CTRL_ATTR_UNSPEC,
+ CTRL_ATTR_FAMILY_ID = 1, /* u16, dynamically-assigned ID */
+ CTRL_ATTR_FAMILY_NAME = 2, /* string, family name */
+ CTRL_ATTR_VERSION = 3, /* u32, command version */
+ CTRL_ATTR_HDRSIZE = 4, /* u32, family header size */
+ CTRL_ATTR_MAXATTR = 5, /* u32, maximum family attr # */
+ CTRL_ATTR_OPS = 6, /* nested, available operations */
+ CTRL_ATTR_MCAST_GROUPS = 7,
+ CTRL_ATTR_POLICY = 8,
+ CTRL_ATTR_OP_POLICY = 9,
+ CTRL_ATTR_OP = 10,
+ __CTRL_ATTR_MAX,
+};
+#define CTRL_ATTR_MAX (__CTRL_ATTR_MAX - 1)
+
+#define GENL_NAMSIZ 16 /* max family name length including \0 */
+
+/* CTRL_ATTR_OPS attributes */
+enum {
+ CTRL_ATTR_OP_UNSPEC,
+ CTRL_ATTR_OP_ID = 1, /* u32, operation # */
+ CTRL_ATTR_OP_FLAGS = 2, /* u32, flags-based op description */
+ __CTRL_ATTR_OP_MAX,
+};
+#define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1)
+
+/* CTRL_ATTR_OP_FLAGS values */
+#define GENL_ADMIN_PERM 0x0001 /* Requires elevated permissions */
+#define GENL_CMD_CAP_DO 0x0002 /* Operation is a modification request */
+#define GENL_CMD_CAP_DUMP 0x0004 /* Operation is a get/dump request */
+#define GENL_CMD_CAP_HASPOL 0x0008 /* Operation has a validation policy */
+#define GENL_UNS_ADMIN_PERM 0x0010
+
+/* CTRL_ATTR_MCAST_GROUPS attributes */
+enum {
+ CTRL_ATTR_MCAST_GRP_UNSPEC,
+ CTRL_ATTR_MCAST_GRP_NAME, /* string, group name */
+ CTRL_ATTR_MCAST_GRP_ID, /* u32, dynamically-assigned group id */
+ __CTRL_ATTR_MCAST_GRP_MAX,
+};
+#define CTRL_ATTR_MCAST_GRP_MAX (CTRL_ATTR_MCAST_GRP_MAX - 1)
+
+
+#endif
+
diff --git a/sys/netlink/netlink_generic.c b/sys/netlink/netlink_generic.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_generic.c
@@ -0,0 +1,472 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include <sys/types.h>
+#include <sys/malloc.h>
+#include <sys/priv.h>
+#include <sys/socket.h>
+#include <sys/ck.h>
+
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_var.h>
+#include <netlink/netlink_generic.h>
+
+#define DEBUG_MOD_NAME nl_generic
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG3);
+
+#define MAX_FAMILIES 20
+#define MAX_GROUPS 20
+
+#define MIN_GROUP_NUM 48
+
+static struct sx sx_lock;
+
+#define GENL_LOCK_INIT() sx_init(&sx_lock, "genetlink lock")
+#define GENL_LOCK_DESTROY() sx_destroy(&sx_lock)
+#define GENL_LOCK() sx_xlock(&sx_lock)
+#define GENL_UNLOCK() sx_xunlock(&sx_lock)
+
+struct genl_family {
+ const char *family_name;
+ uint16_t family_hdrsize;
+ uint16_t family_id;
+ uint16_t family_version;
+ uint16_t family_attr_max;
+ uint16_t family_cmd_size;
+ uint16_t family_num_groups;
+ struct genl_cmd *family_cmds;
+};
+
+static struct genl_family families[MAX_FAMILIES];
+
+
+struct genl_group {
+ struct genl_family *group_family;
+ const char *group_name;
+};
+static struct genl_group groups[MAX_GROUPS];
+
+
+static int dump_family(struct nlmsghdr *hdr, struct genlmsghdr *ghdr,
+ const struct genl_family *gf, struct nl_writer *nw);
+static void nlctrl_notify(const struct genl_family *gf, int action);
+
+static struct genl_family *
+find_family(const char *family_name)
+{
+ for (int i = 0; i < MAX_FAMILIES; i++) {
+ struct genl_family *gf = &families[i];
+ if (gf->family_name != NULL && !strcmp(gf->family_name, family_name))
+ return (gf);
+ }
+
+ return (NULL);
+}
+
+uint32_t
+genl_register_family(const char *family_name, size_t hdrsize, int family_version,
+ int max_attr_idx)
+{
+ uint32_t family_id = 0;
+
+ MPASS(family_name != NULL);
+ if (find_family(family_name) != NULL)
+ return (0);
+
+ GENL_LOCK();
+ for (int i = 0; i < MAX_FAMILIES; i++) {
+ struct genl_family *gf = &families[i];
+ if (gf->family_name == NULL) {
+ gf->family_name = family_name;
+ gf->family_version = family_version;
+ gf->family_hdrsize = hdrsize;
+ gf->family_attr_max = max_attr_idx;
+ gf->family_id = i + GENL_MIN_ID;
+ NL_LOG(LOG_DEBUG2, "Registered family %s id %d",
+ gf->family_name, gf->family_id);
+ family_id = gf->family_id;
+ nlctrl_notify(gf, CTRL_CMD_NEWFAMILY);
+ break;
+ }
+ }
+ GENL_UNLOCK();
+
+ return (family_id);
+}
+
+static void
+free_family(struct genl_family *gf)
+{
+ if (gf->family_cmds != NULL)
+ free(gf->family_cmds, M_NETLINK);
+}
+
+/*
+ * Can sleep, I guess
+ */
+bool
+genl_unregister_family(const char *family_name)
+{
+ bool found = false;
+
+ GENL_LOCK();
+ struct genl_family *gf = find_family(family_name);
+
+ nlctrl_notify(gf, CTRL_CMD_DELFAMILY);
+
+ if (gf != NULL) {
+ found = true;
+ /* TODO: zero pointer first */
+ free_family(gf);
+ bzero(gf, sizeof(*gf));
+ }
+ GENL_UNLOCK();
+
+ return (found);
+}
+
+bool
+genl_register_cmds(const char *family_name, const struct genl_cmd *cmds, int count)
+{
+ GENL_LOCK();
+ struct genl_family *gf = find_family(family_name);
+ if (gf == NULL) {
+ GENL_UNLOCK();
+ return (false);
+ }
+
+ int cmd_size = gf->family_cmd_size;
+
+ for (int i = 0; i < count; i++) {
+ MPASS(cmds[i].cmd_cb != NULL);
+ if (cmds[i].cmd_num >= cmd_size)
+ cmd_size = cmds[i].cmd_num + 1;
+ }
+
+ if (cmd_size > gf->family_cmd_size) {
+ /* need to realloc */
+ size_t sz = cmd_size * sizeof(struct genl_cmd);
+ void *data = malloc(sz, M_NETLINK, M_WAITOK | M_ZERO);
+
+ memcpy(data, gf->family_cmds, gf->family_cmd_size * sizeof(struct genl_cmd));
+ void *old_data = gf->family_cmds;
+ gf->family_cmds = data;
+ gf->family_cmd_size = cmd_size;
+ free(old_data, M_NETLINK);
+ }
+
+ for (int i = 0; i < count; i++) {
+ const struct genl_cmd *cmd = &cmds[i];
+ MPASS(gf->family_cmds[cmd->cmd_num].cmd_cb == NULL);
+ gf->family_cmds[cmd->cmd_num] = cmds[i];
+ NL_LOG(LOG_DEBUG2, "Adding cmd %s(%d) to family %s",
+ cmd->cmd_name, cmd->cmd_num, gf->family_name);
+ }
+ GENL_UNLOCK();
+ return (true);
+}
+
+static struct genl_group *
+find_group(const struct genl_family *gf, const char *group_name)
+{
+ for (int i = 0; i < MAX_GROUPS; i++) {
+ struct genl_group *gg = &groups[i];
+ if (gg->group_family == gf && !strcmp(gg->group_name, group_name))
+ return (gg);
+ }
+ return (NULL);
+}
+
+uint32_t
+genl_register_group(const char *family_name, const char *group_name)
+{
+ uint32_t group_id = 0;
+
+ MPASS(family_name != NULL);
+ MPASS(group_name != NULL);
+
+ GENL_LOCK();
+ struct genl_family *gf = find_family(family_name);
+
+ if (gf == NULL || find_group(gf, group_name) != NULL) {
+ GENL_UNLOCK();
+ return (0);
+ }
+
+ for (int i = 0; i < MAX_GROUPS; i++) {
+ struct genl_group *gg = &groups[i];
+ if (gg->group_family == NULL) {
+ gf->family_num_groups++;
+ gg->group_family = gf;
+ gg->group_name = group_name;
+ group_id = i + MIN_GROUP_NUM;
+ break;
+ }
+ }
+ GENL_UNLOCK();
+
+ return (group_id);
+}
+
+/*
+ * Handler called by netlink subsystem when matching netlink message is received
+ */
+static int
+genl_handle_message(struct nlmsghdr *hdr, struct nl_pstate *npt)
+{
+ struct nlpcb *nlp = npt->nlp;
+ int error = 0;
+
+ int family_id = (int)hdr->nlmsg_type - GENL_MIN_ID;
+
+ if (__predict_false(family_id < 0 || family_id > MAX_FAMILIES)) {
+ NLP_LOG(LOG_DEBUG, nlp, "invalid message type: %d", hdr->nlmsg_type);
+ return (ENOTSUP);
+ }
+
+ if (__predict_false(hdr->nlmsg_len < sizeof(hdr) + GENL_HDRLEN)) {
+ NLP_LOG(LOG_DEBUG, nlp, "invalid message size: %d", hdr->nlmsg_len);
+ return (EINVAL);
+ }
+
+ struct genl_family *gf = &families[family_id];
+
+ struct genlmsghdr *ghdr = (struct genlmsghdr *)(hdr + 1);
+
+ if (ghdr->cmd >= gf->family_cmd_size || gf->family_cmds[ghdr->cmd].cmd_cb == NULL) {
+ NLP_LOG(LOG_DEBUG, nlp, "family %s: invalid cmd %d",
+ gf->family_name, ghdr->cmd);
+ return (ENOTSUP);
+ }
+
+ struct genl_cmd *cmd = &gf->family_cmds[ghdr->cmd];
+
+ if (cmd->cmd_priv != 0 && !nlp_has_priv(nlp, cmd->cmd_priv)) {
+ NLP_LOG(LOG_DEBUG, nlp, "family %s: cmd %d priv_check() failed",
+ gf->family_name, ghdr->cmd);
+ return (EPERM);
+ }
+
+ NLP_LOG(LOG_DEBUG2, nlp, "received family %s cmd %s(%d) len %d",
+ gf->family_name, cmd->cmd_name, ghdr->cmd, hdr->nlmsg_len);
+
+ error = cmd->cmd_cb(hdr, npt);
+
+ return (error);
+}
+
+static uint32_t
+get_cmd_flags(const struct genl_cmd *cmd)
+{
+ uint32_t flags = cmd->cmd_flags;
+ if (cmd->cmd_priv != 0)
+ flags |= GENL_ADMIN_PERM;
+ return (flags);
+}
+
+static int
+dump_family(struct nlmsghdr *hdr, struct genlmsghdr *ghdr,
+ const struct genl_family *gf, struct nl_writer *nw)
+{
+ if (!nlmsg_reply(nw, hdr, sizeof(struct genlmsghdr)))
+ goto enomem;
+
+ struct genlmsghdr *ghdr_new = nlmsg_reserve_object(nw, struct genlmsghdr);
+ ghdr_new->cmd = ghdr->cmd;
+ ghdr_new->version = gf->family_version;
+ ghdr_new->reserved = 0;
+
+ nlattr_add_string(nw, CTRL_ATTR_FAMILY_NAME, gf->family_name);
+ nlattr_add_u16(nw, CTRL_ATTR_FAMILY_ID, gf->family_id);
+ nlattr_add_u32(nw, CTRL_ATTR_VERSION, gf->family_version);
+ nlattr_add_u32(nw, CTRL_ATTR_HDRSIZE, gf->family_hdrsize);
+ nlattr_add_u32(nw, CTRL_ATTR_MAXATTR, gf->family_attr_max);
+
+ if (gf->family_cmd_size > 0) {
+ int off = nlattr_add_nested(nw, CTRL_ATTR_OPS);
+ if (off == 0)
+ goto enomem;
+ for (int i = 0, cnt=0; i < gf->family_cmd_size; i++) {
+ struct genl_cmd *cmd = &gf->family_cmds[i];
+ if (cmd->cmd_cb == NULL)
+ continue;
+ int cmd_off = nlattr_add_nested(nw, ++cnt);
+ if (cmd_off == 0)
+ goto enomem;
+
+ nlattr_add_u32(nw, CTRL_ATTR_OP_ID, cmd->cmd_num);
+ nlattr_add_u32(nw, CTRL_ATTR_OP_FLAGS, get_cmd_flags(cmd));
+ nlattr_set_len(nw, cmd_off);
+ }
+ nlattr_set_len(nw, off);
+ }
+ if (gf->family_num_groups > 0) {
+ int off = nlattr_add_nested(nw, CTRL_ATTR_MCAST_GROUPS);
+ if (off == 0)
+ goto enomem;
+ for (int i = 0, cnt = 0; i < MAX_GROUPS; i++) {
+ struct genl_group *gg = &groups[i];
+ if (gg->group_family != gf)
+ continue;
+
+ int cmd_off = nlattr_add_nested(nw, ++cnt);
+ if (cmd_off == 0)
+ goto enomem;
+ nlattr_add_u32(nw, CTRL_ATTR_MCAST_GRP_ID, i + MIN_GROUP_NUM);
+ nlattr_add_string(nw, CTRL_ATTR_MCAST_GRP_NAME, gg->group_name);
+ nlattr_set_len(nw, cmd_off);
+ }
+ nlattr_set_len(nw, off);
+ }
+ if (nlmsg_end(nw))
+ return (0);
+enomem:
+ NL_LOG(LOG_DEBUG, "unable to dump family %s state (ENOMEM)", gf->family_name);
+ nlmsg_abort(nw);
+ return (ENOMEM);
+}
+
+
+/* Declare ourself as a user */
+#define CTRL_FAMILY_NAME "nlctrl"
+
+static uint32_t ctrl_family_id;
+static uint32_t ctrl_group_id;
+
+struct nl_parsed_family {
+ uint32_t family_id;
+ char *family_name;
+ uint8_t version;
+};
+
+#define _IN(_field) offsetof(struct genlmsghdr, _field)
+#define _OUT(_field) offsetof(struct nl_parsed_family, _field)
+static const struct nlfield_parser nlf_p_generic[] = {
+ { .off_in = _IN(version), .off_out = _OUT(version), .cb = nlf_get_u8 },
+};
+
+static struct nlattr_parser nla_p_generic[] = {
+ { .type = CTRL_ATTR_FAMILY_ID , .off = _OUT(family_id), .cb = nlattr_get_uint32 },
+ { .type = CTRL_ATTR_FAMILY_NAME , .off = _OUT(family_id), .cb = nlattr_get_string },
+};
+#undef _IN
+#undef _OUT
+NL_DECLARE_PARSER(genl_parser, struct genlmsghdr, nlf_p_generic, nla_p_generic);
+
+static int
+nlctrl_handle_getfamily(struct nlmsghdr *hdr, struct nl_pstate *npt)
+{
+ int error = 0;
+
+ struct nl_parsed_family attrs = {};
+ error = nl_parse_nlmsg(hdr, &genl_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ struct genlmsghdr ghdr = {
+ .cmd = CTRL_CMD_NEWFAMILY,
+ };
+
+ for (int i = 0; i < MAX_FAMILIES; i++) {
+ struct genl_family *gf = &families[i];
+ if (gf->family_name == NULL)
+ continue;
+ if (attrs.family_id != 0 && attrs.family_id != gf->family_id)
+ continue;
+ if (attrs.family_name != NULL && strcmp(attrs.family_name, gf->family_name))
+ continue;
+ error = dump_family(hdr, &ghdr, &families[i], npt->nw);
+ if (error != 0)
+ break;
+ }
+
+ return (error);
+}
+
+static void
+nlctrl_notify(const struct genl_family *gf, int cmd)
+{
+ struct nlmsghdr hdr = {.nlmsg_type = NETLINK_GENERIC };
+ struct genlmsghdr ghdr = { .cmd = cmd };
+ struct nl_writer nw = {};
+
+ if (nlmsg_get_group_writer(&nw, NLMSG_SMALL, NETLINK_GENERIC, ctrl_group_id)) {
+ dump_family(&hdr, &ghdr, gf, &nw);
+ nlmsg_flush(&nw);
+ return;
+ }
+ NL_LOG(LOG_DEBUG, "error allocating group writer");
+}
+
+static const struct genl_cmd nlctrl_cmds[] = {
+ {
+ .cmd_num = CTRL_CMD_GETFAMILY,
+ .cmd_name = "GETFAMILY",
+ .cmd_cb = nlctrl_handle_getfamily,
+ .cmd_flags = GENL_CMD_CAP_DO | GENL_CMD_CAP_DUMP, GENL_CMD_CAP_HASPOL,
+ },
+};
+
+static void
+genl_nlctrl_init()
+{
+ ctrl_family_id = genl_register_family(CTRL_FAMILY_NAME, 0, 2, CTRL_ATTR_MAX);
+ genl_register_cmds(CTRL_FAMILY_NAME, nlctrl_cmds, NL_ARRAY_LEN(nlctrl_cmds));
+ ctrl_group_id = genl_register_group(CTRL_FAMILY_NAME, "notify");
+}
+
+static void
+genl_nlctrl_destroy()
+{
+ genl_unregister_family(CTRL_FAMILY_NAME);
+}
+
+static const struct nlhdr_parser *all_parsers[] = { &genl_parser };
+
+static void
+genl_load(void *u __unused)
+{
+ GENL_LOCK_INIT();
+ NL_VERIFY_PARSERS(all_parsers);
+ netlink_register_proto(NETLINK_GENERIC, "NETLINK_GENERIC", genl_handle_message);
+ genl_nlctrl_init();
+}
+SYSINIT(genl_load, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, genl_load, NULL);
+
+static void
+genl_unload(void *u __unused)
+{
+ genl_nlctrl_destroy();
+ GENL_LOCK_DESTROY();
+ epoch_wait_preempt(net_epoch_preempt);
+}
+SYSUNINIT(genl_unload, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, genl_unload, NULL);
diff --git a/sys/netlink/netlink_io.c b/sys/netlink/netlink_io.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_io.c
@@ -0,0 +1,539 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Ng Peng Nam Sean
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include <sys/param.h>
+#include <sys/malloc.h>
+#include <sys/lock.h>
+#include <sys/mbuf.h>
+#include <sys/ck.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/syslog.h>
+
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_linux.h>
+#include <netlink/netlink_var.h>
+
+#define DEBUG_MOD_NAME nl_io
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG);
+
+/*
+ * The logic below provide a p2p interface for receiving and
+ * sending netlink data between the kernel and userland.
+ */
+
+static const struct sockaddr_nl _nl_empty_src = {
+ .nl_len = sizeof(struct sockaddr_nl),
+ .nl_family = PF_NETLINK,
+ .nl_pid = 0 /* comes from the kernel */
+};
+static const struct sockaddr *nl_empty_src = (const struct sockaddr *)&_nl_empty_src;
+
+static struct mbuf *nl_process_mbuf(struct mbuf *m, struct nlpcb *nlp);
+
+
+static void
+queue_push(struct nl_io_queue *q, struct mbuf *m)
+{
+ struct mbuf *m_last;
+
+ for (m_last = m; m_last->m_nextpkt != NULL; m_last = m_last->m_nextpkt)
+ q->length += m_length(m_last, NULL);
+ q->length += m_length(m_last, NULL);
+
+ if (q->last == NULL) {
+ q->head = m;
+ q->last = m_last;
+ } else {
+ q->last->m_nextpkt = m;
+ q->last = m_last;
+ }
+}
+
+static void
+queue_push_head(struct nl_io_queue *q, struct mbuf *m)
+{
+ MPASS(m->m_nextpkt == NULL);
+
+ q->length += m_length(m, NULL);
+
+ if (q->last == NULL) {
+ q->head = m;
+ q->last = m;
+ } else {
+ m->m_nextpkt = q->head;
+ q->head = m;
+ }
+}
+
+static struct mbuf *
+queue_pop(struct nl_io_queue *q)
+{
+ if (q->head != NULL) {
+ struct mbuf *m = q->head;
+ q->head = m->m_nextpkt;
+ m->m_nextpkt = NULL;
+ if (q->head == NULL)
+ q->last = NULL;
+ q->length -= m_length(m, NULL);
+
+ return (m);
+ }
+ return (NULL);
+}
+
+static struct mbuf *
+queue_head(const struct nl_io_queue *q)
+{
+ return (q->head);
+}
+
+static inline bool
+queue_empty(const struct nl_io_queue *q)
+{
+ return (q->length == 0);
+}
+
+static void
+queue_free(struct nl_io_queue *q)
+{
+ struct mbuf *m = q->head;
+
+ while (m != NULL) {
+ struct mbuf *m_next = m->m_nextpkt;
+ m->m_nextpkt = NULL;
+ m_freem(m);
+ m = m_next;
+ }
+ q->head = NULL;
+ q->last = NULL;
+ q->length = 0;
+}
+
+
+static void
+nl_schedule_taskqueue(struct nlpcb *nlp)
+{
+ if (!nlp->nl_task_pending) {
+ nlp->nl_task_pending = true;
+ taskqueue_enqueue(nlp->nl_taskqueue, &nlp->nl_task);
+ NL_LOG(LOG_DEBUG3, "taskqueue scheduled");
+ } else {
+ NL_LOG(LOG_DEBUG3, "taskqueue schedule skipped");
+ }
+}
+
+int
+nl_receive_async(struct mbuf *m, struct socket *so)
+{
+ struct nlpcb *nlp = sotonlpcb(so);
+ int error = 0;
+
+ m->m_nextpkt = NULL;
+
+ NLP_LOCK(nlp);
+
+ if ((__predict_true(nlp->nl_active))) {
+ sbappend(&so->so_snd, m, 0);
+ NL_LOG(LOG_DEBUG3, "enqueue %u bytes", m_length(m, NULL));
+ nl_schedule_taskqueue(nlp);
+ } else {
+ NL_LOG(LOG_DEBUG, "ignoring %u bytes on non-active socket",
+ m_length(m, NULL));
+ m_free(m);
+ error = EINVAL;
+ }
+
+ NLP_UNLOCK(nlp);
+
+ return (error);
+}
+
+static bool
+tx_check_locked(struct nlpcb *nlp)
+{
+ if (queue_empty(&nlp->tx_queue))
+ return (true);
+
+ /*
+ * Check if something can be moved from the internal TX queue
+ * to the socket queue.
+ */
+
+ bool appended = false;
+ struct sockbuf *sb = &nlp->nl_socket->so_rcv;
+ SOCKBUF_LOCK(sb);
+
+ while (true) {
+ struct mbuf *m = queue_head(&nlp->tx_queue);
+ if (m && sbappendaddr_locked(sb, nl_empty_src, m, NULL) != 0) {
+ /* appended successfully */
+ queue_pop(&nlp->tx_queue);
+ appended = true;
+ } else
+ break;
+ }
+
+ SOCKBUF_UNLOCK(sb);
+
+ if (appended)
+ sorwakeup(nlp->nl_socket);
+
+ return (queue_empty(&nlp->tx_queue));
+}
+
+static bool
+nl_process_received_one(struct nlpcb *nlp)
+{
+ bool reschedule = false;
+
+ NLP_LOCK(nlp);
+ nlp->nl_task_pending = false;
+
+ if (!tx_check_locked(nlp)) {
+ /* TX overflow queue still not empty, ignore RX */
+ NLP_UNLOCK(nlp);
+ return (false);
+ }
+
+ if (queue_empty(&nlp->rx_queue)) {
+ /*
+ * Grab all data we have from the socket TX queue
+ * and store it the internal queue, so it can be worked on
+ * w/o holding socket lock.
+ */
+ struct sockbuf *sb = &nlp->nl_socket->so_snd;
+
+ SOCKBUF_LOCK(sb);
+ unsigned int avail = sbavail(sb);
+ if (avail > 0) {
+ NL_LOG(LOG_DEBUG3, "grabbed %u bytes", avail);
+ queue_push(&nlp->rx_queue, sbcut_locked(sb, avail));
+ }
+ SOCKBUF_UNLOCK(sb);
+ } else {
+ /* Schedule another pass to read from the socket queue */
+ reschedule = true;
+ }
+
+ int prev_hiwat = nlp->tx_queue.hiwat;
+ NLP_UNLOCK(nlp);
+
+ while (!queue_empty(&nlp->rx_queue)) {
+ struct mbuf *m = queue_pop(&nlp->rx_queue);
+
+ m = nl_process_mbuf(m, nlp);
+ if (m != NULL) {
+ queue_push_head(&nlp->rx_queue, m);
+ reschedule = false;
+ break;
+ }
+ }
+ if (nlp->tx_queue.hiwat > prev_hiwat) {
+ NLP_LOG(LOG_DEBUG, nlp, "TX override peaked to %d", nlp->tx_queue.hiwat);
+
+ }
+
+ return (reschedule);
+}
+
+static void
+nl_process_received(struct nlpcb *nlp)
+{
+ NL_LOG(LOG_DEBUG3, "taskqueue called");
+
+ while (nl_process_received_one(nlp))
+ ;
+}
+
+void
+nl_free_io(struct nlpcb *nlp)
+{
+ queue_free(&nlp->rx_queue);
+ queue_free(&nlp->tx_queue);
+}
+
+/*
+ * Called after some data have been read from the socket.
+ */
+void
+nl_on_transmit(struct nlpcb *nlp)
+{
+ NLP_LOCK(nlp);
+
+ struct socket *so = nlp->nl_socket;
+ if (__predict_false(nlp->nl_dropped_bytes > 0 && so != NULL)) {
+ uint64_t dropped_bytes = nlp->nl_dropped_bytes;
+ uint64_t dropped_messages = nlp->nl_dropped_messages;
+ nlp->nl_dropped_bytes = 0;
+ nlp->nl_dropped_messages = 0;
+
+ struct sockbuf *sb = &so->so_rcv;
+ NLP_LOG(LOG_DEBUG, nlp,
+ "socket RX overflowed, %lu messages (%lu bytes) dropped. "
+ "bytes: [%u/%u] mbufs: [%u/%u]", dropped_messages, dropped_bytes,
+ sb->sb_ccc, sb->sb_hiwat, sb->sb_mbcnt, sb->sb_mbmax);
+ /* TODO: send netlink message */
+ }
+
+ nl_schedule_taskqueue(nlp);
+ NLP_UNLOCK(nlp);
+}
+
+void
+nl_taskqueue_handler(void *_arg, int pending)
+{
+ struct nlpcb *nlp = (struct nlpcb *)_arg;
+
+ CURVNET_SET(nlp->nl_socket->so_vnet);
+ nl_process_received(nlp);
+ CURVNET_RESTORE();
+}
+
+static __noinline void
+queue_push_tx(struct nlpcb *nlp, struct mbuf *m)
+{
+ queue_push(&nlp->tx_queue, m);
+ nlp->nl_tx_blocked = true;
+
+ if (nlp->tx_queue.length > nlp->tx_queue.hiwat)
+ nlp->tx_queue.hiwat = nlp->tx_queue.length;
+}
+
+/*
+ * Tries to send @m to the socket @nlp.
+ *
+ * @m: mbuf(s) to send to. Consumed in any case.
+ * @nlp: socket to send to
+ * @cnt: number of messages in @m
+ * @io_flags: combination of NL_IOF_* flags
+ *
+ * Returns true on success.
+ * If no queue overrunes happened, wakes up socket owner.
+ */
+bool
+nl_send_one(struct mbuf *m, struct nlpcb *nlp, int num_messages, int io_flags)
+{
+ bool untranslated = io_flags & NL_IOF_UNTRANSLATED;
+ bool ignore_limits = io_flags & NL_IOF_IGNORE_LIMIT;
+ bool result = true;
+
+ IF_DEBUG_LEVEL(LOG_DEBUG2) {
+ struct nlmsghdr *hdr = mtod(m, struct nlmsghdr *);
+ NLP_LOG(LOG_DEBUG2, nlp,
+ "TX mbuf len %u msgs %u msg type %d first hdrlen %u io_flags %X",
+ m_length(m, NULL), num_messages, hdr->nlmsg_type, hdr->nlmsg_len,
+ io_flags);
+ }
+
+ if (__predict_false(nlp->nl_linux && linux_netlink_p != NULL && untranslated)) {
+ m = linux_netlink_p->mbufs_to_linux(nlp->nl_proto, m, nlp);
+ if (m == NULL)
+ return (false);
+ }
+
+ NLP_LOCK(nlp);
+
+ if (__predict_false(nlp->nl_socket == NULL)) {
+ NLP_UNLOCK(nlp);
+ m_freem(m);
+ return (false);
+ }
+
+ if (!queue_empty(&nlp->tx_queue)) {
+ if (ignore_limits) {
+ queue_push_tx(nlp, m);
+ } else {
+ m_free(m);
+ result = false;
+ }
+ NLP_UNLOCK(nlp);
+ return (result);
+ }
+
+ struct socket *so = nlp->nl_socket;
+ if (sbappendaddr(&so->so_rcv, nl_empty_src, m, NULL) != 0) {
+ sorwakeup(so);
+ NLP_LOG(LOG_DEBUG3, nlp, "appended data & woken up");
+ } else {
+ if (ignore_limits) {
+ queue_push_tx(nlp, m);
+ } else {
+ /*
+ * Store dropped data so it can be reported
+ * on the next read
+ */
+ nlp->nl_dropped_bytes += m_length(m, NULL);
+ nlp->nl_dropped_messages += num_messages;
+ NLP_LOG(LOG_DEBUG2, nlp, "RX oveflow: %lu m (+%d), %lu b (+%d)",
+ nlp->nl_dropped_messages, num_messages,
+ nlp->nl_dropped_bytes, m_length(m, NULL));
+ soroverflow(so);
+ m_freem(m);
+ result = false;
+ }
+ }
+ NLP_UNLOCK(nlp);
+
+ return (result);
+}
+
+static int
+nl_receive_message(struct nlmsghdr *hdr, int remaining_length,
+ struct nlpcb *nlp, struct nl_pstate *npt)
+{
+ nl_handler_f handler = nl_handlers[nlp->nl_proto].cb;
+ int error = 0;
+
+ NL_LOG(LOG_DEBUG2, "msg len: %d type: %d", hdr->nlmsg_len,
+ hdr->nlmsg_type);
+
+ if (__predict_false(hdr->nlmsg_len > remaining_length)) {
+ NLP_LOG(LOG_DEBUG, nlp, "message is not entirely present: want %d got %d",
+ hdr->nlmsg_len, remaining_length);
+ return (EINVAL);
+ } else if (__predict_false(hdr->nlmsg_len < sizeof(*hdr))) {
+ NL_LOG(LOG_DEBUG, "message too short: %d", hdr->nlmsg_len);
+ return (EINVAL);
+ }
+ /* Stamp each message with sender pid */
+ hdr->nlmsg_pid = nlp->nl_port;
+
+ npt->hdr = hdr;
+
+ if (hdr->nlmsg_flags & NLM_F_REQUEST && hdr->nlmsg_type >= NLMSG_MIN_TYPE) {
+ NL_LOG(LOG_DEBUG2, "handling message with msg type: %d",
+ hdr->nlmsg_type);
+
+ if (nlp->nl_linux && linux_netlink_p != NULL) {
+ struct nlmsghdr *hdr_orig = hdr;
+ hdr = linux_netlink_p->msg_from_linux(nlp->nl_proto, hdr, npt);
+ if (hdr == NULL) {
+ npt->hdr = hdr_orig;
+ if (hdr->nlmsg_flags & NLM_F_ACK)
+ nlmsg_ack(nlp, EAGAIN, hdr, npt);
+ return (0);
+ }
+ }
+ error = handler(hdr, npt);
+ NL_LOG(LOG_DEBUG2, "retcode: %d", error);
+ }
+ if ((hdr->nlmsg_flags & NLM_F_ACK) || (error != 0 && error != EINTR)) {
+ NL_LOG(LOG_DEBUG3, "ack");
+ nlmsg_ack(nlp, error, hdr, npt);
+ NL_LOG(LOG_DEBUG3, "done");
+ }
+
+ return (0);
+}
+
+static void
+npt_clear(struct nl_pstate *npt)
+{
+ lb_clear(&npt->lb);
+ npt->error = 0;
+ npt->err_msg = NULL;
+ npt->err_off = 0;
+ npt->hdr = NULL;
+}
+
+/*
+ * Processes an incoming packet, which can contain multiple netlink messages
+ */
+static struct mbuf *
+nl_process_mbuf(struct mbuf *m, struct nlpcb *nlp)
+{
+ int offset, buffer_length;
+ struct nlmsghdr *hdr;
+ char *buffer;
+ int error;
+
+ NL_LOG(LOG_DEBUG3, "RX netlink mbuf %p on %p", m, nlp->nl_socket);
+
+ struct nl_writer nw = {};
+ if (!nlmsg_get_unicast_writer(&nw, NLMSG_SMALL, nlp)) {
+ m_freem(m);
+ NL_LOG(LOG_DEBUG, "error allocating socket writer");
+ return (NULL);
+ }
+
+ nlmsg_ignore_limit(&nw);
+ /* TODO: alloc this buf once for nlp */
+ int data_length = m_length(m, NULL);
+ buffer_length = roundup2(data_length, 8) + SCRATCH_BUFFER_SIZE;
+ if (nlp->nl_linux)
+ buffer_length += roundup2(data_length, 8);
+ buffer = malloc(buffer_length, M_NETLINK, M_NOWAIT | M_ZERO);
+ if (buffer == NULL) {
+ m_freem(m);
+ nlmsg_flush(&nw);
+ NL_LOG(LOG_DEBUG, "Unable to allocate %d bytes of memory",
+ buffer_length);
+ return (NULL);
+ }
+ m_copydata(m, 0, data_length, buffer);
+
+ struct nl_pstate npt = {
+ .nlp = nlp,
+ .lb.base = &buffer[roundup2(data_length, 8)],
+ .lb.size = buffer_length - roundup2(data_length, 8),
+ .nw = &nw,
+ .strict = nlp->nl_flags & NLF_STRICT,
+ };
+
+ for (offset = 0; offset + sizeof(struct nlmsghdr) <= data_length;) {
+ hdr = (struct nlmsghdr *)&buffer[offset];
+ /* Save length prior to calling handler */
+ int msglen = NLMSG_ALIGN(hdr->nlmsg_len);
+ NL_LOG(LOG_DEBUG3, "parsing offset %d/%d", offset, data_length);
+ npt_clear(&npt);
+ error = nl_receive_message(hdr, data_length - offset, nlp, &npt);
+ offset += msglen;
+ if (__predict_false(error != 0 || nlp->nl_tx_blocked))
+ break;
+ }
+ NL_LOG(LOG_DEBUG3, "packet parsing done");
+ free(buffer, M_NETLINK);
+ nlmsg_flush(&nw);
+
+ if (nlp->nl_tx_blocked) {
+ NLP_LOCK(nlp);
+ nlp->nl_tx_blocked = false;
+ NLP_UNLOCK(nlp);
+ m_adj(m, offset);
+ return (m);
+ } else {
+ m_freem(m);
+ return (NULL);
+ }
+}
diff --git a/sys/netlink/netlink_linux.h b/sys/netlink/netlink_linux.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_linux.h
@@ -0,0 +1,54 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _NETLINK_LINUX_VAR_H_
+#define _NETLINK_LINUX_VAR_H_
+
+/*
+ * The file contains headers for the bridge interface between
+ * linux[_common] module and the netlink module
+ */
+struct nlpcb;
+struct nl_pstate;
+
+typedef struct mbuf *mbufs_to_linux_cb_t(int netlink_family, struct mbuf *m,
+ struct nlpcb *nlp);
+typedef struct mbuf *msgs_to_linux_cb_t(int netlink_family, char *buf, int data_length,
+ struct nlpcb *nlp);
+typedef struct nlmsghdr *msg_from_linux_cb_t(int netlink_family, struct nlmsghdr *hdr,
+ struct nl_pstate *npt);
+
+struct linux_netlink_provider {
+ mbufs_to_linux_cb_t *mbufs_to_linux;
+ msgs_to_linux_cb_t *msgs_to_linux;
+ msg_from_linux_cb_t *msg_from_linux;
+
+};
+
+extern struct linux_netlink_provider *linux_netlink_p;
+
+#endif
diff --git a/sys/netlink/netlink_message_parser.h b/sys/netlink/netlink_message_parser.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_message_parser.h
@@ -0,0 +1,270 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _NETLINK_NETLINK_MESSAGE_PARSER_H_
+#define _NETLINK_NETLINK_MESSAGE_PARSER_H_
+
+/*
+ * It is not meant to be included directly
+ */
+
+/* Parsing state */
+struct linear_buffer {
+ char *base; /* Base allocated memory pointer */
+ uint32_t offset; /* Currently used offset */
+ uint32_t size; /* Total buffer size */
+};
+
+static inline void *
+lb_alloc(struct linear_buffer *lb, int len)
+{
+ len = roundup2(len, sizeof(uint64_t));
+ if (lb->offset + len > lb->size)
+ return (NULL);
+ void *data = (void *)(lb->base + lb->offset);
+ lb->offset += len;
+ return (data);
+}
+
+static inline void
+lb_clear(struct linear_buffer *lb)
+{
+ memset(lb->base, 0, lb->size);
+ lb->offset = 0;
+}
+
+#define NL_MAX_ERROR_BUF 128
+#define SCRATCH_BUFFER_SIZE (1024 + NL_MAX_ERROR_BUF)
+struct nl_pstate {
+ struct linear_buffer lb; /* Per-message scratch buffer */
+ struct nlpcb *nlp; /* Originator socket */
+ struct nl_writer *nw; /* Message writer to use */
+ struct nlmsghdr *hdr; /* Current parsed message header */
+ uint32_t err_off; /* error offset from hdr start */
+ int error; /* last operation error */
+ char *err_msg; /* Description of last error */
+ bool strict; /* Strict parsing required */
+};
+
+static inline void *
+npt_alloc(struct nl_pstate *npt, int len)
+{
+ return (lb_alloc(&npt->lb, len));
+}
+#define npt_alloc_sockaddr(_npt, _len) ((struct sockaddr *)(npt_alloc(_npt, _len)))
+
+typedef int parse_field_f(void *hdr, struct nl_pstate *npt,
+ void *target);
+struct nlfield_parser {
+ uint16_t off_in;
+ uint16_t off_out;
+ parse_field_f *cb;
+};
+static const struct nlfield_parser nlf_p_empty[] = {};
+
+int nlf_get_ifp(void *src, struct nl_pstate *npt, void *target);
+int nlf_get_ifpz(void *src, struct nl_pstate *npt, void *target);
+int nlf_get_u8(void *src, struct nl_pstate *npt, void *target);
+int nlf_get_u16(void *src, struct nl_pstate *npt, void *target);
+int nlf_get_u32(void *src, struct nl_pstate *npt, void *target);
+int nlf_get_u8_u32(void *src, struct nl_pstate *npt, void *target);
+
+
+struct nlattr_parser;
+typedef int parse_attr_f(struct nlattr *attr, struct nl_pstate *npt,
+ const void *arg, void *target);
+struct nlattr_parser {
+ uint16_t type; /* Attribute type */
+ uint16_t off; /* field offset in the target structure */
+ parse_attr_f *cb; /* parser function to call */
+ const void *arg;
+};
+
+typedef bool strict_parser_f(void *hdr, struct nl_pstate *npt);
+
+struct nlhdr_parser {
+ int nl_hdr_off; /* aligned netlink header size */
+ int out_hdr_off; /* target header size */
+ int fp_size;
+ int np_size;
+ const struct nlfield_parser *fp; /* array of header field parsers */
+ const struct nlattr_parser *np; /* array of attribute parsers */
+ strict_parser_f *sp; /* Parser function */
+};
+
+#define NL_DECLARE_PARSER(_name, _t, _fp, _np) \
+static const struct nlhdr_parser _name = { \
+ .nl_hdr_off = sizeof(_t), \
+ .fp = &((_fp)[0]), \
+ .np = &((_np)[0]), \
+ .fp_size = NL_ARRAY_LEN(_fp), \
+ .np_size = NL_ARRAY_LEN(_np), \
+}
+
+#define NL_DECLARE_STRICT_PARSER(_name, _t, _sp, _fp, _np)\
+static const struct nlhdr_parser _name = { \
+ .nl_hdr_off = sizeof(_t), \
+ .fp = &((_fp)[0]), \
+ .np = &((_np)[0]), \
+ .fp_size = NL_ARRAY_LEN(_fp), \
+ .np_size = NL_ARRAY_LEN(_np), \
+ .sp = _sp, \
+}
+
+#define NL_DECLARE_ARR_PARSER(_name, _t, _o, _fp, _np) \
+static const struct nlhdr_parser _name = { \
+ .nl_hdr_off = sizeof(_t), \
+ .out_hdr_off = sizeof(_o), \
+ .fp = &((_fp)[0]), \
+ .np = &((_np)[0]), \
+ .fp_size = NL_ARRAY_LEN(_fp), \
+ .np_size = NL_ARRAY_LEN(_np), \
+}
+
+#define NL_DECLARE_ATTR_PARSER(_name, _np) \
+static const struct nlhdr_parser _name = { \
+ .np = &((_np)[0]), \
+ .np_size = NL_ARRAY_LEN(_np), \
+}
+
+struct nlarr_hdr {
+ int num_items;
+ int max_items;
+};
+
+int nl_parse_attrs_raw(struct nlattr *nla_head, int len, const struct nlattr_parser *ps,
+ int pslen, struct nl_pstate *npt, void *target);
+int nl_parse_attrs(struct nlmsghdr *hdr, int hdrlen, struct nlattr_parser *ps,
+ int pslen, struct nl_pstate *npt, void *target);
+
+int nlattr_get_flag(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_ip(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_uint16(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_uint32(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_uint64(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_ifp(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_ifpz(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_ipvia(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_string(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_stringn(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_nla(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+int nlattr_get_nested(struct nlattr *nla, struct nl_pstate *npt,
+ const void *arg, void *target);
+
+bool nlmsg_report_err_msg(struct nl_pstate *npt, const char *fmt, ...);
+
+#define NLMSG_REPORT_ERR_MSG(_npt, _fmt, ...) { \
+ nlmsg_report_err_msg(_npt, _fmt, ## __VA_ARGS__); \
+ NLP_LOG(LOG_DEBUG, (_npt)->nlp, _fmt, ## __VA_ARGS__); \
+}
+
+bool nlmsg_report_err_offset(struct nl_pstate *npt, uint32_t off);
+
+/*
+ * Have it inline so compiler can optimize field accesses into
+ * the list of direct function calls without iteration.
+ */
+static inline int
+nl_parse_header(void *hdr, int len, const struct nlhdr_parser *parser,
+ struct nl_pstate *npt, void *target)
+{
+ int error;
+
+ if (__predict_false(len < parser->nl_hdr_off)) {
+ nlmsg_report_err_msg(npt, "header too short: expected %d, got %d",
+ parser->nl_hdr_off, len);
+ return (EINVAL);
+ }
+
+ if (npt->strict && parser->sp != NULL && !parser->sp(hdr, npt))
+ return (EINVAL);
+
+ /* Extract fields first */
+ for (int i = 0; i < parser->fp_size; i++) {
+ const struct nlfield_parser *fp = &parser->fp[i];
+ void *src = (char *)hdr + fp->off_in;
+ void *dst = (char *)target + fp->off_out;
+
+ error = fp->cb(src, npt, dst);
+ if (error != 0)
+ return (error);
+ }
+
+ struct nlattr *nla_head = (struct nlattr *)((char *)hdr + parser->nl_hdr_off);
+ error = nl_parse_attrs_raw(nla_head, len - parser->nl_hdr_off, parser->np,
+ parser->np_size, npt, target);
+
+ return (error);
+}
+
+static inline int
+nl_parse_nested(struct nlattr *nla, const struct nlhdr_parser *parser,
+ struct nl_pstate *npt, void *target)
+{
+ struct nlattr *nla_head = (struct nlattr *)NLA_DATA(nla);
+
+ return (nl_parse_attrs_raw(nla_head, NLA_DATA_LEN(nla), parser->np,
+ parser->np_size, npt, target));
+}
+
+/*
+ * Checks that attributes are sorted by attribute type.
+ */
+static inline void
+nl_verify_parsers(const struct nlhdr_parser **parser, int count)
+{
+ for (int i = 0; i < count; i++) {
+ const struct nlhdr_parser *p = parser[i];
+ int attr_type = 0;
+ for (int j = 0; j < p->np_size; j++) {
+ MPASS(p->np[j].type > attr_type);
+ attr_type = p->np[j].type;
+ }
+ }
+}
+void nl_verify_parsers(const struct nlhdr_parser **parser, int count);
+#define NL_VERIFY_PARSERS(_p) nl_verify_parsers((_p), NL_ARRAY_LEN(_p))
+
+static inline int
+nl_parse_nlmsg(struct nlmsghdr *hdr, const struct nlhdr_parser *parser,
+ struct nl_pstate *npt, void *target)
+{
+ return (nl_parse_header(hdr + 1, hdr->nlmsg_len - sizeof(*hdr), parser, npt, target));
+}
+
+#endif
diff --git a/sys/netlink/netlink_message_parser.c b/sys/netlink/netlink_message_parser.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_message_parser.c
@@ -0,0 +1,472 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include "opt_inet.h"
+#include "opt_inet6.h"
+#include <sys/types.h>
+#include <sys/malloc.h>
+#include <sys/rmlock.h>
+#include <sys/socket.h>
+
+#include <machine/stdarg.h>
+
+#include <net/if.h>
+#include <net/route.h>
+#include <net/route/nhop.h>
+
+#include <net/route/route_ctl.h>
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_var.h>
+#include <netlink/netlink_route.h>
+
+#define DEBUG_MOD_NAME nl_parser
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG);
+
+bool
+nlmsg_report_err_msg(struct nl_pstate *npt, const char *fmt, ...)
+{
+ va_list ap;
+
+ if (npt->err_msg != NULL)
+ return (false);
+ char *buf = npt_alloc(npt, NL_MAX_ERROR_BUF);
+ if (buf == NULL)
+ return (false);
+ va_start(ap, fmt);
+ vsnprintf(buf, NL_MAX_ERROR_BUF, fmt, ap);
+ va_end(ap);
+
+ npt->err_msg = buf;
+ return (true);
+}
+
+bool
+nlmsg_report_err_offset(struct nl_pstate *npt, uint32_t off)
+{
+ if (npt->err_off != 0)
+ return (false);
+ npt->err_off = off;
+ return (true);
+}
+
+static const struct nlattr_parser *
+search_states(const struct nlattr_parser *ps, int pslen, int key)
+{
+ int left_i = 0, right_i = pslen - 1;
+
+ if (key < ps[0].type || key > ps[pslen - 1].type)
+ return (NULL);
+
+ while (left_i + 1 < right_i) {
+ int mid_i = (left_i + right_i) / 2;
+ if (key < ps[mid_i].type)
+ right_i = mid_i;
+ else if (key > ps[mid_i].type)
+ left_i = mid_i + 1;
+ else
+ return (&ps[mid_i]);
+ }
+ if (ps[left_i].type == key)
+ return (&ps[left_i]);
+ else if (ps[right_i].type == key)
+ return (&ps[right_i]);
+ return (NULL);
+}
+
+int
+nl_parse_attrs_raw(struct nlattr *nla_head, int len, const struct nlattr_parser *ps, int pslen,
+ struct nl_pstate *npt, void *target)
+{
+ struct nlattr *nla = NULL;
+ int error = 0;
+
+ NL_LOG(LOG_DEBUG3, "parse %p remaining_len %d", nla_head, len);
+ int orig_len = len;
+ NLA_FOREACH(nla, nla_head, len) {
+ NL_LOG(LOG_DEBUG3, ">> parsing %p attr_type %d len %d (rem %d)", nla, nla->nla_type, nla->nla_len, len);
+ if (nla->nla_len < sizeof(struct nlattr)) {
+ NLMSG_REPORT_ERR_MSG(npt, "Invalid attr %p type %d len: %d",
+ nla, nla->nla_type, nla->nla_len);
+ uint32_t off = (char *)nla - (char *)npt->hdr;
+ nlmsg_report_err_offset(npt, off);
+ return (EINVAL);
+ }
+
+ int nla_type = nla->nla_type & NLA_TYPE_MASK;
+ const struct nlattr_parser *s = search_states(ps, pslen, nla_type);
+ if (s != NULL) {
+ void *ptr = (void *)((char *)target + s->off);
+ error = s->cb(nla, npt, s->arg, ptr);
+ if (error != 0) {
+ uint32_t off = (char *)nla - (char *)npt->hdr;
+ nlmsg_report_err_offset(npt, off);
+ NL_LOG(LOG_DEBUG3, "parse failed att offset %u", off);
+ return (error);
+ }
+ } else {
+ /* Ignore non-specified attributes */
+ NL_LOG(LOG_DEBUG3, "ignoring attr %d", nla->nla_type);
+ }
+ }
+ if (len >= sizeof(struct nlattr)) {
+ nla = (struct nlattr *)((char *)nla_head + (orig_len - len));
+ NL_LOG(LOG_DEBUG3, " >>> end %p attr_type %d len %d", nla,
+ nla->nla_type, nla->nla_len);
+ }
+ NL_LOG(LOG_DEBUG3, "end parse: %p remaining_len %d", nla, len);
+
+ return (0);
+}
+
+int
+nl_parse_attrs(struct nlmsghdr *hdr, int hdrlen, struct nlattr_parser *ps, int pslen,
+ struct nl_pstate *npt, void *target)
+{
+ int off = NLMSG_HDRLEN + NETLINK_ALIGN(hdrlen);
+ int len = hdr->nlmsg_len - off;
+ struct nlattr *nla_head = (struct nlattr *)((char *)hdr + off);
+
+ return (nl_parse_attrs_raw(nla_head, len, ps, pslen, npt, target));
+}
+
+int
+nlattr_get_flag(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ if (__predict_false(NLA_DATA_LEN(nla) != 0)) {
+ NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not a flag",
+ nla->nla_type, NLA_DATA_LEN(nla));
+ return (EINVAL);
+ }
+
+ *((uint8_t *)target) = 1;
+ return (0);
+}
+
+static struct sockaddr *
+parse_rta_ip4(void *rta_data, struct nl_pstate *npt, int *perror)
+{
+ struct sockaddr_in *sin;
+
+ sin = (struct sockaddr_in *)npt_alloc_sockaddr(npt, sizeof(struct sockaddr_in));
+ if (__predict_false(sin == NULL)) {
+ *perror = ENOBUFS;
+ return (NULL);
+ }
+ sin->sin_len = sizeof(struct sockaddr_in);
+ sin->sin_family = AF_INET;
+ memcpy(&sin->sin_addr, rta_data, sizeof(struct in_addr));
+ return ((struct sockaddr *)sin);
+}
+
+static struct sockaddr *
+parse_rta_ip6(void *rta_data, struct nl_pstate *npt, int *perror)
+{
+ struct sockaddr_in6 *sin6;
+
+ sin6 = (struct sockaddr_in6 *)npt_alloc_sockaddr(npt, sizeof(struct sockaddr_in6));
+ if (__predict_false(sin6 == NULL)) {
+ *perror = ENOBUFS;
+ return (NULL);
+ }
+ sin6->sin6_len = sizeof(struct sockaddr_in6);
+ sin6->sin6_family = AF_INET6;
+ memcpy(&sin6->sin6_addr, rta_data, sizeof(struct in6_addr));
+ return ((struct sockaddr *)sin6);
+}
+
+static struct sockaddr *
+parse_rta_ip(struct rtattr *rta, struct nl_pstate *npt, int *perror)
+{
+ void *rta_data = NL_RTA_DATA(rta);
+ int rta_len = NL_RTA_DATA_LEN(rta);
+
+ if (rta_len == sizeof(struct in_addr)) {
+ return (parse_rta_ip4(rta_data, npt, perror));
+ } else if (rta_len == sizeof(struct in6_addr)) {
+ return (parse_rta_ip6(rta_data, npt, perror));
+ } else {
+ NLMSG_REPORT_ERR_MSG(npt, "unknown IP len: %d for rta type %d",
+ rta_len, rta->rta_type);
+ *perror = ENOTSUP;
+ return (NULL);
+ }
+ return (NULL);
+}
+
+int
+nlattr_get_ip(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ int error = 0;
+
+ struct sockaddr *sa = parse_rta_ip((struct rtattr *)nla, npt, &error);
+
+ *((struct sockaddr **)target) = sa;
+ return (error);
+}
+
+static struct sockaddr *
+parse_rta_via(struct rtattr *rta, struct nl_pstate *npt, int *perror)
+{
+ struct rtvia *via = NL_RTA_DATA(rta);
+ int data_len = NL_RTA_DATA_LEN(rta);
+
+ if (__predict_false(data_len) < sizeof(struct rtvia)) {
+ NLMSG_REPORT_ERR_MSG(npt, "undersized RTA_VIA(%d) attr: len %d",
+ rta->rta_type, data_len);
+ *perror = EINVAL;
+ return (NULL);
+ }
+ data_len -= offsetof(struct rtvia, rtvia_addr);
+
+ switch (via->rtvia_family) {
+ case AF_INET:
+ if (__predict_false(data_len < sizeof(struct in_addr))) {
+ *perror = EINVAL;
+ return (NULL);
+ }
+ return (parse_rta_ip4(via->rtvia_addr, npt, perror));
+ case AF_INET6:
+ if (__predict_false(data_len < sizeof(struct in6_addr))) {
+ *perror = EINVAL;
+ return (NULL);
+ }
+ return (parse_rta_ip6(via->rtvia_addr, npt, perror));
+ default:
+ *perror = ENOTSUP;
+ return (NULL);
+ }
+}
+
+int
+nlattr_get_ipvia(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ int error = 0;
+
+ struct sockaddr *sa = parse_rta_via((struct rtattr *)nla, npt, &error);
+
+ *((struct sockaddr **)target) = sa;
+ return (error);
+}
+
+
+int
+nlattr_get_uint16(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ if (__predict_false(NLA_DATA_LEN(nla) != sizeof(uint16_t))) {
+ NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not uint32",
+ nla->nla_type, NLA_DATA_LEN(nla));
+ return (EINVAL);
+ }
+ *((uint16_t *)target) = *((const uint16_t *)NL_RTA_DATA_CONST(nla));
+ return (0);
+}
+
+int
+nlattr_get_uint32(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ if (__predict_false(NLA_DATA_LEN(nla) != sizeof(uint32_t))) {
+ NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not uint32",
+ nla->nla_type, NLA_DATA_LEN(nla));
+ return (EINVAL);
+ }
+ *((uint32_t *)target) = *((const uint32_t *)NL_RTA_DATA_CONST(nla));
+ return (0);
+}
+
+int
+nlattr_get_uint64(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ if (__predict_false(NLA_DATA_LEN(nla) != sizeof(uint64_t))) {
+ NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not uint64",
+ nla->nla_type, NLA_DATA_LEN(nla));
+ return (EINVAL);
+ }
+ memcpy(target, NL_RTA_DATA_CONST(nla), sizeof(uint64_t));
+ return (0);
+}
+
+static int
+nlattr_get_ifp_internal(struct nlattr *nla, struct nl_pstate *npt,
+ void *target, bool zero_ok)
+{
+ if (__predict_false(NLA_DATA_LEN(nla) != sizeof(uint32_t))) {
+ NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not uint32",
+ nla->nla_type, NLA_DATA_LEN(nla));
+ return (EINVAL);
+ }
+ uint32_t ifindex = *((const uint32_t *)NLA_DATA_CONST(nla));
+
+ if (ifindex == 0 && zero_ok) {
+ *((struct ifnet **)target) = NULL;
+ return (0);
+ }
+
+ NET_EPOCH_ASSERT();
+
+ struct ifnet *ifp = ifnet_byindex(ifindex);
+ if (__predict_false(ifp == NULL)) {
+ NLMSG_REPORT_ERR_MSG(npt, "nla type %d: ifindex %u invalid",
+ nla->nla_type, ifindex);
+ return (ENOENT);
+ }
+ *((struct ifnet **)target) = ifp;
+ NL_LOG(LOG_DEBUG3, "nla type %d: ifindex %u -> %s", nla->nla_type,
+ ifindex, if_name(ifp));
+
+ return (0);
+}
+
+int
+nlattr_get_ifp(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ return (nlattr_get_ifp_internal(nla, npt, target, false));
+}
+
+int
+nlattr_get_ifpz(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ return (nlattr_get_ifp_internal(nla, npt, target, true));
+}
+
+int
+nlattr_get_string(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ int maxlen = NLA_DATA_LEN(nla);
+
+ if (__predict_false(strnlen((char *)NLA_DATA(nla), maxlen) >= maxlen)) {
+ NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not NULL-terminated",
+ nla->nla_type, maxlen);
+ return (EINVAL);
+ }
+
+ *((char **)target) = (char *)NLA_DATA(nla);
+ return (0);
+}
+
+int
+nlattr_get_stringn(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ int maxlen = NLA_DATA_LEN(nla);
+
+ char *buf = npt_alloc(npt, maxlen + 1);
+ if (buf == NULL)
+ return (ENOMEM);
+ buf[maxlen] = '\0';
+ memcpy(buf, NLA_DATA(nla), maxlen);
+
+ *((char **)target) = buf;
+ return (0);
+}
+int
+nlattr_get_nla(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ NL_LOG(LOG_DEBUG3, "STORING %p len %d", nla, nla->nla_len);
+ *((struct nlattr **)target) = nla;
+ return (0);
+}
+
+int
+nlattr_get_nested(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ const struct nlhdr_parser *p = (const struct nlhdr_parser *)arg;
+ int error;
+
+ /* Assumes target points to the beginning of the structure */
+ error = nl_parse_header(NLA_DATA(nla), NLA_DATA_LEN(nla), p, npt, target);
+ return (error);
+}
+
+int
+nlf_get_ifp(void *src, struct nl_pstate *npt, void *target)
+{
+ int ifindex = *((const int *)src);
+
+ NET_EPOCH_ASSERT();
+
+ struct ifnet *ifp = ifnet_byindex(ifindex);
+ if (ifp == NULL) {
+ NL_LOG(LOG_DEBUG, "ifindex %u invalid", ifindex);
+ return (ENOENT);
+ }
+ *((struct ifnet **)target) = ifp;
+
+ return (0);
+}
+
+int
+nlf_get_ifpz(void *src, struct nl_pstate *npt, void *target)
+{
+ int ifindex = *((const int *)src);
+
+ NET_EPOCH_ASSERT();
+
+ struct ifnet *ifp = ifnet_byindex(ifindex);
+ if (ifindex != 0 && ifp == NULL) {
+ NL_LOG(LOG_DEBUG, "ifindex %u invalid", ifindex);
+ return (ENOENT);
+ }
+ *((struct ifnet **)target) = ifp;
+
+ return (0);
+}
+
+int
+nlf_get_u8(void *src, struct nl_pstate *npt, void *target)
+{
+ uint8_t val = *((const uint8_t *)src);
+
+ *((uint8_t *)target) = val;
+
+ return (0);
+}
+
+int
+nlf_get_u8_u32(void *src, struct nl_pstate *npt, void *target)
+{
+ *((uint32_t *)target) = *((const uint8_t *)src);
+ return (0);
+}
+
+int
+nlf_get_u16(void *src, struct nl_pstate *npt, void *target)
+{
+ *((uint16_t *)target) = *((const uint16_t *)src);
+ return (0);
+}
+
+int
+nlf_get_u32(void *src, struct nl_pstate *npt, void *target)
+{
+ *((uint32_t *)target) = *((const uint32_t *)src);
+ return (0);
+}
+
diff --git a/sys/netlink/netlink_message_writer.h b/sys/netlink/netlink_message_writer.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_message_writer.h
@@ -0,0 +1,250 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Ng Peng Nam Sean
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _NETLINK_NETLINK_MESSAGE_WRITER_H_
+#define _NETLINK_NETLINK_MESSAGE_WRITER_H_
+
+/*
+ * It is not meant to be included directly
+ */
+
+struct mbuf;
+struct nl_writer;
+typedef bool nl_writer_cb(struct nl_writer *nw, void *buf, int buflen, int cnt);
+
+struct nl_writer {
+ int alloc_len; /* allocated buffer length */
+ int offset; /* offset from the start of the buffer */
+ struct nlmsghdr *hdr; /* Pointer to the currently-filled msg */
+ char *data; /* pointer to the contiguous storage */
+ void *_storage; /* Underlying storage pointer */
+ nl_writer_cb *cb; /* Callback to flush data */
+ union {
+ void *arg_ptr; /* Callback argument as pointer */
+ uint64_t arg_uint; /* Callback argument as int */
+ };
+ int num_messages; /* Number of messages in the buffer */
+ int malloc_flag; /* M_WAITOK or M_NOWAIT */
+ uint8_t writer_type; /* NS_WRITER_TYPE_* */
+ uint8_t writer_target; /* NS_WRITER_TARGET_* */
+ bool ignore_limit; /* If true, ignores RCVBUF limit */
+ bool enomem; /* True if ENOMEM occured */
+};
+#define NS_WRITER_TARGET_SOCKET 0
+#define NS_WRITER_TARGET_GROUP 1
+#define NS_WRITER_TARGET_CHAIN 2
+
+#define NS_WRITER_TYPE_MBUF 0
+#define NS_WRITER_TYPE_BUF 1
+#define NS_WRITER_TYPE_LBUF 2
+#define NS_WRITER_TYPE_MBUFC 3
+
+
+#define NLMSG_SMALL 128
+#define NLMSG_LARGE 2048
+
+/* Message and attribute writing */
+
+struct nlpcb;
+bool nlmsg_get_unicast_writer(struct nl_writer *nw, int expected_size, struct nlpcb *nlp);
+bool nlmsg_get_group_writer(struct nl_writer *nw, int expected_size, int proto, int group_id);
+bool nlmsg_get_chain_writer(struct nl_writer *nw, int expected_size, struct mbuf **pm);
+bool nlmsg_flush(struct nl_writer *nw);
+void nlmsg_ignore_limit(struct nl_writer *nw);
+
+bool nlmsg_refill_buffer(struct nl_writer *nw, int required_size);
+bool nlmsg_add(struct nl_writer *nw, uint32_t portid, uint32_t seq, uint16_t type,
+ uint16_t flags, uint32_t len);
+bool nlmsg_end(struct nl_writer *nw);
+void nlmsg_abort(struct nl_writer *nw);
+
+bool nlmsg_end_dump(struct nl_writer *nw, int error, struct nlmsghdr *hdr);
+
+static inline bool
+nlmsg_reply(struct nl_writer *nw, const struct nlmsghdr *hdr, int payload_len)
+{
+ return (nlmsg_add(nw, hdr->nlmsg_pid, hdr->nlmsg_seq, hdr->nlmsg_type,
+ hdr->nlmsg_flags, payload_len));
+}
+
+#define nlmsg_data(_hdr) ((void *)((_hdr) + 1))
+
+/*
+ * KPI similar to mtodo():
+ * current (uncompleted) header is guaranteed to be contiguous,
+ * but can be reallocated, thus pointers may need to be readjusted.
+ */
+static inline int
+nlattr_save_offset(const struct nl_writer *nw)
+{
+ return (nw->offset - ((char *)nw->hdr - nw->data));
+}
+
+static inline void *
+_nlattr_restore_offset(const struct nl_writer *nw, int off)
+{
+ return ((void *)((char *)nw->hdr + off));
+}
+#define nlattr_restore_offset(_ns, _off, _t) ((_t *)_nlattr_restore_offset(_ns, _off))
+
+static inline void
+nlattr_set_len(const struct nl_writer *nw, int off)
+{
+ struct nlattr *nla = nlattr_restore_offset(nw, off, struct nlattr);
+ nla->nla_len = nlattr_save_offset(nw) - off;
+}
+
+static inline void *
+nlmsg_reserve_data_raw(struct nl_writer *nw, size_t sz)
+{
+ if (__predict_false(nw->offset + NETLINK_ALIGN(sz) > nw->alloc_len)) {
+ if (!nlmsg_refill_buffer(nw, NETLINK_ALIGN(sz)))
+ return (NULL);
+ }
+
+ void *data_ptr = &nw->data[nw->offset];
+ nw->offset += NLMSG_ALIGN(sz);
+
+ return (data_ptr);
+}
+#define nlmsg_reserve_object(_ns, _t) ((_t *)nlmsg_reserve_data_raw(_ns, NLA_ALIGN(sizeof(_t))))
+#define nlmsg_reserve_data(_ns, _sz, _t) ((_t *)nlmsg_reserve_data_raw(_ns, _sz))
+
+static inline int
+nlattr_add_nested(struct nl_writer *nw, uint16_t nla_type)
+{
+ int off = nlattr_save_offset(nw);
+ struct nlattr *nla = nlmsg_reserve_data(nw, sizeof(struct nlattr), struct nlattr);
+ if (__predict_false(nla == NULL))
+ return (0);
+ nla->nla_type = nla_type;
+ return (off);
+}
+
+static inline void *
+_nlmsg_reserve_attr(struct nl_writer *nw, uint16_t nla_type, uint16_t sz)
+{
+ sz += sizeof(struct nlattr);
+
+ struct nlattr *nla = nlmsg_reserve_data(nw, sz, struct nlattr);
+ if (__predict_false(nla == NULL))
+ return (NULL);
+ nla->nla_type = nla_type;
+ nla->nla_len = sz;
+
+ return ((void *)(nla + 1));
+}
+#define nlmsg_reserve_attr(_ns, _at, _t) ((_t *)_nlmsg_reserve_attr(_ns, _at, NLA_ALIGN(sizeof(_t))))
+
+static inline bool
+nlattr_add(struct nl_writer *nw, int attr_type, int attr_len, const void *data)
+{
+ int required_len = NLA_ALIGN(attr_len + sizeof(struct nlattr));
+
+ if (__predict_false(nw->offset + required_len > nw->alloc_len)) {
+ if (!nlmsg_refill_buffer(nw, required_len))
+ return (false);
+ }
+
+ struct nlattr *nla = (struct nlattr *)(&nw->data[nw->offset]);
+
+ nla->nla_len = attr_len + sizeof(struct nlattr);
+ nla->nla_type = attr_type;
+ if (attr_len > 0) {
+ if ((attr_len % 4) != 0) {
+ /* clear padding bytes */
+ bzero((char *)nla + required_len - 4, 4);
+ }
+ memcpy((nla + 1), data, attr_len);
+ }
+ nw->offset += required_len;
+ return (true);
+}
+
+static inline bool
+nlattr_add_u8(struct nl_writer *nw, int attrtype, uint8_t value)
+{
+ return (nlattr_add(nw, attrtype, sizeof(uint8_t), &value));
+}
+
+static inline bool
+nlattr_add_u16(struct nl_writer *nw, int attrtype, uint16_t value)
+{
+ return (nlattr_add(nw, attrtype, sizeof(uint16_t), &value));
+}
+
+static inline bool
+nlattr_add_u32(struct nl_writer *nw, int attrtype, uint32_t value)
+{
+ return (nlattr_add(nw, attrtype, sizeof(uint32_t), &value));
+}
+
+static inline bool
+nlattr_add_u64(struct nl_writer *nw, int attrtype, uint64_t value)
+{
+ return (nlattr_add(nw, attrtype, sizeof(uint64_t), &value));
+}
+
+static inline bool
+nlattr_add_s8(struct nl_writer *nw, int attrtype, int8_t value)
+{
+ return (nlattr_add(nw, attrtype, sizeof(int8_t), &value));
+}
+
+static inline bool
+nlattr_add_s16(struct nl_writer *nw, int attrtype, int16_t value)
+{
+ return (nlattr_add(nw, attrtype, sizeof(int16_t), &value));
+}
+
+static inline bool
+nlattr_add_s32(struct nl_writer *nw, int attrtype, int32_t value)
+{
+ return (nlattr_add(nw, attrtype, sizeof(int32_t), &value));
+}
+
+static inline bool
+nlattr_add_s64(struct nl_writer *nw, int attrtype, int64_t value)
+{
+ return (nlattr_add(nw, attrtype, sizeof(int64_t), &value));
+}
+
+static inline bool
+nlattr_add_flag(struct nl_writer *nw, int attrtype)
+{
+ return (nlattr_add(nw, attrtype, 0, NULL));
+}
+
+static inline bool
+nlattr_add_string(struct nl_writer *nw, int attrtype, const char *str)
+{
+ return (nlattr_add(nw, attrtype, strlen(str) + 1, str));
+}
+
+
+#endif
diff --git a/sys/netlink/netlink_message_writer.c b/sys/netlink/netlink_message_writer.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_message_writer.c
@@ -0,0 +1,686 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include <sys/param.h>
+#include <sys/malloc.h>
+#include <sys/lock.h>
+#include <sys/rmlock.h>
+#include <sys/mbuf.h>
+#include <sys/ck.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/syslog.h>
+
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_linux.h>
+#include <netlink/netlink_var.h>
+
+#define DEBUG_MOD_NAME nl_writer
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG);
+
+/*
+ * The goal of this file is to provide convenient message writing KPI on top of
+ * different storage methods (mbufs, uio, temporary memory chunks).
+ *
+ * The main KPI guarantee is the the (last) message always resides in the contiguous
+ * memory buffer, so one is able to update the header after writing the entire message.
+ *
+ * This guarantee comes with a side effect of potentially reallocating underlying
+ * buffer, so one needs to update the desired pointers after something is added
+ * to the header.
+ *
+ * Messaging layer contains hooks performing transparent Linux translation for the messages.
+ *
+ * There are 3 types of supported targets:
+ * * socket (adds mbufs to the socket buffer, used for message replies)
+ * * group (sends mbuf/chain to the specified groups, used for the notifications)
+ * * chain (returns mbuf chain, used in Linux message translation code)
+ *
+ * There are 3 types of storage:
+ * * NS_WRITER_TYPE_MBUF (mbuf-based, most efficient, used when a single message
+ * fits in MCLBYTES)
+ * * NS_WRITER_TYPE_BUF (fallback, malloc-based, used when a single message needs
+ * to be larger than one supported by NS_WRITER_TYPE_MBUF)
+ * * NS_WRITER_TYPE_LBUF (malloc-based, similar to NS_WRITER_TYPE_BUF, used for
+ * Linux sockets, calls translation hook prior to sending messages to the socket).
+ *
+ * Internally, KPI switches between different types of storage when memory requirements
+ * change. It happens transparently to the caller.
+ */
+
+
+typedef bool nlwriter_op_init(struct nl_writer *nw, int size, bool waitok);
+typedef bool nlwriter_op_write(struct nl_writer *nw, void *buf, int buflen, int cnt);
+
+struct nlwriter_ops {
+ nlwriter_op_init *init;
+ nlwriter_op_write *write_socket;
+ nlwriter_op_write *write_group;
+ nlwriter_op_write *write_chain;
+};
+
+/*
+ * NS_WRITER_TYPE_BUF
+ * Writes message to a temporary memory buffer,
+ * flushing to the socket/group when buffer size limit is reached
+ */
+static bool
+nlmsg_get_ns_buf(struct nl_writer *nw, int size, bool waitok)
+{
+ int mflag = waitok ? M_WAITOK : M_NOWAIT;
+ nw->_storage = malloc(size, M_NETLINK, mflag | M_ZERO);
+ if (__predict_false(nw->_storage == NULL))
+ return (false);
+ nw->alloc_len = size;
+ nw->offset = 0;
+ nw->hdr = NULL;
+ nw->data = nw->_storage;
+ nw->writer_type = NS_WRITER_TYPE_BUF;
+ nw->malloc_flag = mflag;
+ nw->num_messages = 0;
+ nw->enomem = false;
+ return (true);
+}
+
+static bool
+nlmsg_write_socket_buf(struct nl_writer *nw, void *buf, int datalen, int cnt)
+{
+ NL_LOG(LOG_DEBUG2, "IN: ptr: %p len: %d arg: %p", buf, datalen, nw);
+ if (__predict_false(datalen == 0)) {
+ free(buf, M_NETLINK);
+ return (true);
+ }
+
+ struct mbuf *m = m_getm2(NULL, datalen, nw->malloc_flag, MT_DATA, M_PKTHDR);
+ if (__predict_false(m == NULL)) {
+ /* XXX: should we set sorcverr? */
+ free(buf, M_NETLINK);
+ return (false);
+ }
+ m_append(m, datalen, buf);
+ free(buf, M_NETLINK);
+
+ int io_flags = (nw->ignore_limit) ? NL_IOF_IGNORE_LIMIT : 0;
+ return (nl_send_one(m, (struct nlpcb *)(nw->arg_ptr), cnt, io_flags));
+}
+
+static bool
+nlmsg_write_group_buf(struct nl_writer *nw, void *buf, int datalen, int cnt)
+{
+ NL_LOG(LOG_DEBUG2, "IN: ptr: %p len: %d arg: %p", buf, datalen, nw->arg_ptr);
+ if (__predict_false(datalen == 0)) {
+ free(buf, M_NETLINK);
+ return (true);
+ }
+
+ struct mbuf *m = m_getm2(NULL, datalen, nw->malloc_flag, MT_DATA, M_PKTHDR);
+ if (__predict_false(m == NULL)) {
+ free(buf, M_NETLINK);
+ return (false);
+ }
+ bool success = m_append(m, datalen, buf) != 0;
+ free(buf, M_NETLINK);
+
+ if (!success)
+ return (false);
+
+ nl_send_group(m, cnt, nw->arg_uint >> 16, nw->arg_uint & 0xFFFF);
+ return (true);
+}
+
+static bool
+nlmsg_write_chain_buf(struct nl_writer *nw, void *buf, int datalen, int cnt)
+{
+ struct mbuf **m0 = (struct mbuf **)(nw->arg_ptr);
+ NL_LOG(LOG_DEBUG2, "IN: ptr: %p len: %d arg: %p", buf, datalen, nw->arg_ptr);
+
+ if (__predict_false(datalen == 0)) {
+ free(buf, M_NETLINK);
+ return (true);
+ }
+
+ if (*m0 == NULL) {
+ struct mbuf *m;
+
+ m = m_getm2(NULL, datalen, nw->malloc_flag, MT_DATA, M_PKTHDR);
+ if (__predict_false(m == NULL)) {
+ free(buf, M_NETLINK);
+ return (false);
+ }
+ *m0 = m;
+ }
+ if (__predict_false(m_append(*m0, datalen, buf) == 0)) {
+ free(buf, M_NETLINK);
+ return (false);
+ }
+ return (true);
+}
+
+
+/*
+ * NS_WRITER_TYPE_MBUF
+ * Writes message to the allocated mbuf,
+ * flushing to socket/group when mbuf size limit is reached.
+ * This is the most efficient mechanism as it avoids double-copying.
+ *
+ * Allocates a single mbuf suitable to store up to @size bytes of data.
+ * If size < MHLEN (around 160 bytes), allocates mbuf with pkghdr
+ * If size <= MCLBYTES (2k), allocate a single mbuf cluster
+ * Otherwise, return NULL.
+ */
+static bool
+nlmsg_get_ns_mbuf(struct nl_writer *nw, int size, bool waitok)
+{
+ struct mbuf *m;
+
+ int mflag = waitok ? M_WAITOK : M_NOWAIT;
+ m = m_get2(size, mflag, MT_DATA, M_PKTHDR);
+ if (__predict_false(m == NULL))
+ return (false);
+ nw->alloc_len = M_TRAILINGSPACE(m);
+ nw->offset = 0;
+ nw->hdr = NULL;
+ nw->_storage = (void *)m;
+ nw->data = mtod(m, void *);
+ nw->writer_type = NS_WRITER_TYPE_MBUF;
+ nw->malloc_flag = mflag;
+ nw->num_messages = 0;
+ nw->enomem = false;
+ NL_LOG(LOG_DEBUG2, "alloc mbuf %p req_len %d alloc_len %d data_ptr %p",
+ m, size, nw->alloc_len, nw->data);
+ return (true);
+}
+
+static bool
+nlmsg_write_socket_mbuf(struct nl_writer *nw, void *buf, int datalen, int cnt)
+{
+ struct mbuf *m = (struct mbuf *)buf;
+ NL_LOG(LOG_DEBUG2, "IN: ptr: %p len: %d arg: %p", buf, datalen, nw->arg_ptr);
+
+ if (__predict_false(datalen == 0)) {
+ m_freem(m);
+ return (true);
+ }
+
+ m->m_pkthdr.len = datalen;
+ m->m_len = datalen;
+ int io_flags = (nw->ignore_limit) ? NL_IOF_IGNORE_LIMIT : 0;
+ return (nl_send_one(m, (struct nlpcb *)(nw->arg_ptr), cnt, io_flags));
+}
+
+static bool
+nlmsg_write_group_mbuf(struct nl_writer *nw, void *buf, int datalen, int cnt)
+{
+ struct mbuf *m = (struct mbuf *)buf;
+ NL_LOG(LOG_DEBUG2, "IN: ptr: %p len: %d arg: %p", buf, datalen, nw->arg_ptr);
+
+ if (__predict_false(datalen == 0)) {
+ m_freem(m);
+ return (true);
+ }
+
+ m->m_pkthdr.len = datalen;
+ m->m_len = datalen;
+ nl_send_group(m, cnt, nw->arg_uint >> 16, nw->arg_uint & 0xFFFF);
+ return (true);
+}
+
+static bool
+nlmsg_write_chain_mbuf(struct nl_writer *nw, void *buf, int datalen, int cnt)
+{
+ struct mbuf *m_new = (struct mbuf *)buf;
+ struct mbuf **m0 = (struct mbuf **)(nw->arg_ptr);
+
+ NL_LOG(LOG_DEBUG2, "IN: ptr: %p len: %d arg: %p", buf, datalen, nw->arg_ptr);
+
+ if (__predict_false(datalen == 0)) {
+ m_freem(m_new);
+ return (true);
+ }
+
+ m_new->m_pkthdr.len = datalen;
+ m_new->m_len = datalen;
+
+ if (*m0 == NULL) {
+ *m0 = m_new;
+ } else {
+ struct mbuf *m_last;
+ for (m_last = *m0; m_last->m_next != NULL; m_last = m_last->m_next)
+ ;
+ m_last->m_next = m_new;
+ (*m0)->m_pkthdr.len += datalen;
+ }
+
+ return (true);
+}
+
+/*
+ * NS_WRITER_TYPE_LBUF
+ * Writes message to the allocated memory buffer,
+ * flushing to socket/group when mbuf size limit is reached.
+ * Calls linux handler to rewrite messages before sending to the socket.
+ */
+static bool
+nlmsg_get_ns_lbuf(struct nl_writer *nw, int size, bool waitok)
+{
+ int mflag = waitok ? M_WAITOK : M_NOWAIT;
+ size = roundup2(size, sizeof(void *));
+ int add_size = sizeof(struct linear_buffer) + SCRATCH_BUFFER_SIZE;
+ char *buf = malloc(add_size + size * 2, M_NETLINK, mflag | M_ZERO);
+ if (__predict_false(buf == NULL))
+ return (false);
+
+ /* Fill buffer header first */
+ struct linear_buffer *lb = (struct linear_buffer *)buf;
+ lb->base = &buf[sizeof(struct linear_buffer) + size];
+ lb->size = size + SCRATCH_BUFFER_SIZE;
+
+ nw->alloc_len = size;
+ nw->offset = 0;
+ nw->hdr = NULL;
+ nw->_storage = buf;
+ nw->data = (char *)(lb + 1);
+ nw->malloc_flag = mflag;
+ nw->writer_type = NS_WRITER_TYPE_LBUF;
+ nw->num_messages = 0;
+ nw->enomem = false;
+ return (true);
+}
+
+
+static bool
+nlmsg_write_socket_lbuf(struct nl_writer *nw, void *buf, int datalen, int cnt)
+{
+ struct linear_buffer *lb = (struct linear_buffer *)buf;
+ char *data = (char *)(lb + 1);
+ struct nlpcb *nlp = (struct nlpcb *)(nw->arg_ptr);
+
+ if (__predict_false(datalen == 0)) {
+ free(buf, M_NETLINK);
+ return (true);
+ }
+
+ struct mbuf *m = NULL;
+ if (linux_netlink_p != NULL)
+ m = linux_netlink_p->msgs_to_linux(nlp->nl_proto, data, datalen, nlp);
+ free(buf, M_NETLINK);
+
+ if (__predict_false(m == NULL)) {
+ /* XXX: should we set sorcverr? */
+ return (false);
+ }
+
+ int io_flags = (nw->ignore_limit) ? NL_IOF_IGNORE_LIMIT : 0;
+ return (nl_send_one(m, nlp, cnt, io_flags));
+}
+
+/* Shouldn't be called (maybe except Linux code originating message) */
+static bool
+nlmsg_write_group_lbuf(struct nl_writer *nw, void *buf, int datalen, int cnt)
+{
+ struct linear_buffer *lb = (struct linear_buffer *)buf;
+ char *data = (char *)(lb + 1);
+
+ if (__predict_false(datalen == 0)) {
+ free(buf, M_NETLINK);
+ return (true);
+ }
+
+ struct mbuf *m = m_getm2(NULL, datalen, nw->malloc_flag, MT_DATA, M_PKTHDR);
+ if (__predict_false(m == NULL)) {
+ free(buf, M_NETLINK);
+ return (false);
+ }
+ m_append(m, datalen, data);
+ free(buf, M_NETLINK);
+
+ nl_send_group(m, cnt, nw->arg_uint >> 16, nw->arg_uint & 0xFFFF);
+ return (true);
+}
+
+struct nlwriter_ops nlmsg_writers[] = {
+ /* NS_WRITER_TYPE_MBUF */
+ {
+ .init = nlmsg_get_ns_mbuf,
+ .write_socket = nlmsg_write_socket_mbuf,
+ .write_group = nlmsg_write_group_mbuf,
+ .write_chain = nlmsg_write_chain_mbuf,
+ },
+ /* NS_WRITER_TYPE_BUF */
+ {
+ .init = nlmsg_get_ns_buf,
+ .write_socket = nlmsg_write_socket_buf,
+ .write_group = nlmsg_write_group_buf,
+ .write_chain = nlmsg_write_chain_buf,
+ },
+ /* NS_WRITER_TYPE_LBUF */
+ {
+ .init = nlmsg_get_ns_lbuf,
+ .write_socket = nlmsg_write_socket_lbuf,
+ .write_group = nlmsg_write_group_lbuf,
+ },
+};
+
+static void
+nlmsg_set_callback(struct nl_writer *nw)
+{
+ struct nlwriter_ops *pops = &nlmsg_writers[nw->writer_type];
+
+ switch (nw->writer_target) {
+ case NS_WRITER_TARGET_SOCKET:
+ nw->cb = pops->write_socket;
+ break;
+ case NS_WRITER_TARGET_GROUP:
+ nw->cb = pops->write_group;
+ break;
+ case NS_WRITER_TARGET_CHAIN:
+ nw->cb = pops->write_chain;
+ break;
+ default:
+ panic("not implemented");
+ }
+}
+
+static bool
+nlmsg_get_buf_type(struct nl_writer *nw, int size, int type, bool waitok)
+{
+ MPASS(type + 1 <= sizeof(nlmsg_writers) / sizeof(nlmsg_writers[0]));
+ NL_LOG(LOG_DEBUG3, "Setting up nw %p size %d type %d", nw, size, type);
+ return (nlmsg_writers[type].init(nw, size, waitok));
+}
+
+static bool
+nlmsg_get_buf(struct nl_writer *nw, int size, bool waitok, bool is_linux)
+{
+ int type;
+
+ if (!is_linux) {
+ if (__predict_true(size <= MCLBYTES))
+ type = NS_WRITER_TYPE_MBUF;
+ else
+ type = NS_WRITER_TYPE_BUF;
+ } else
+ type = NS_WRITER_TYPE_LBUF;
+ return (nlmsg_get_buf_type(nw, size, type, waitok));
+}
+
+bool
+nlmsg_get_unicast_writer(struct nl_writer *nw, int size, struct nlpcb *nlp)
+{
+ if (!nlmsg_get_buf(nw, size, false, nlp->nl_linux))
+ return (false);
+ nw->arg_ptr = (void *)nlp;
+ nw->writer_target = NS_WRITER_TARGET_SOCKET;
+ nlmsg_set_callback(nw);
+ return (true);
+}
+
+bool
+nlmsg_get_group_writer(struct nl_writer *nw, int size, int protocol, int group_id)
+{
+ if (!nlmsg_get_buf(nw, size, false, false))
+ return (false);
+ nw->arg_uint = (uint64_t)protocol << 16 | (uint64_t)group_id;
+ nw->writer_target = NS_WRITER_TARGET_GROUP;
+ nlmsg_set_callback(nw);
+ return (true);
+}
+
+bool
+nlmsg_get_chain_writer(struct nl_writer *nw, int size, struct mbuf **pm)
+{
+ if (!nlmsg_get_buf(nw, size, false, false))
+ return (false);
+ *pm = NULL;
+ nw->arg_ptr = (void *)pm;
+ nw->writer_target = NS_WRITER_TARGET_CHAIN;
+ nlmsg_set_callback(nw);
+ NL_LOG(LOG_DEBUG3, "setup cb %p (need %p)", nw->cb, &nlmsg_write_chain_mbuf);
+ return (true);
+}
+
+void
+nlmsg_ignore_limit(struct nl_writer *nw)
+{
+ nw->ignore_limit = true;
+}
+
+bool
+nlmsg_flush(struct nl_writer *nw)
+{
+
+ if (__predict_false(nw->hdr != NULL)) {
+ /* Last message has not been completed, skip it. */
+ int completed_len = (char *)nw->hdr - nw->data;
+ /* Send completed messages */
+ nw->offset -= nw->offset - completed_len;
+ nw->hdr = NULL;
+ }
+
+ NL_LOG(LOG_DEBUG2, "OUT");
+ bool result = nw->cb(nw, nw->_storage, nw->offset, nw->num_messages);
+ nw->_storage = NULL;
+
+ if (!result) {
+ NL_LOG(LOG_DEBUG, "nw %p offset %d: flush with %p() failed", nw, nw->offset, nw->cb);
+ }
+
+ return (result);
+}
+
+/*
+ * Flushes previous data and allocates new underlying storage
+ * sufficient for holding at least @required_len bytes.
+ * Return true on success.
+ */
+bool
+nlmsg_refill_buffer(struct nl_writer *nw, int required_len)
+{
+ struct nl_writer ns_new = {};
+ int completed_len, new_len;
+
+ if (nw->enomem)
+ return (false);
+
+ NL_LOG(LOG_DEBUG3, "no space at offset %d/%d (want %d), trying to reclaim",
+ nw->offset, nw->alloc_len, required_len);
+
+ /* Calculated new buffer size and allocate it s*/
+ completed_len = (nw->hdr != NULL) ? (char *)nw->hdr - nw->data : nw->offset;
+ if (completed_len > 0 && required_len < MCLBYTES) {
+ /* We already ran out of space, use the largest effective size */
+ new_len = max(nw->alloc_len, MCLBYTES);
+ } else {
+ if (nw->alloc_len < MCLBYTES)
+ new_len = MCLBYTES;
+ else
+ new_len = nw->alloc_len * 2;
+ while (new_len < required_len)
+ new_len *= 2;
+ }
+ bool waitok = (nw->malloc_flag == M_WAITOK);
+ bool is_linux = (nw->writer_type == NS_WRITER_TYPE_LBUF);
+ if (!nlmsg_get_buf(&ns_new, new_len, waitok, is_linux)) {
+ nw->enomem = true;
+ NL_LOG(LOG_DEBUG, "getting new buf failed, setting ENOMEM");
+ return (false);
+ }
+ if (nw->ignore_limit)
+ nlmsg_ignore_limit(&ns_new);
+
+ /* Update callback data */
+ ns_new.writer_target = nw->writer_target;
+ nlmsg_set_callback(&ns_new);
+ ns_new.arg_uint = nw->arg_uint;
+
+ /* Copy last (unfinished) header to the new storage */
+ int last_len = nw->offset - completed_len;
+ if (last_len > 0) {
+ memcpy(ns_new.data, nw->hdr, last_len);
+ ns_new.hdr = (struct nlmsghdr *)ns_new.data;
+ ns_new.offset = last_len;
+ }
+
+ NL_LOG(LOG_DEBUG2, "completed: %d bytes, copied: %d bytes", completed_len, last_len);
+
+ /* Flush completed headers & switch to the new nw */
+ nlmsg_flush(nw);
+ memcpy(nw, &ns_new, sizeof(struct nl_writer));
+ NL_LOG(LOG_DEBUG2, "switched buffer: used %d/%d bytes", nw->offset, nw->alloc_len);
+
+ return (true);
+}
+
+bool
+nlmsg_add(struct nl_writer *nw, uint32_t portid, uint32_t seq, uint16_t type,
+ uint16_t flags, uint32_t len)
+{
+ struct nlmsghdr *hdr;
+
+ MPASS(nw->hdr == NULL);
+
+ int required_len = NETLINK_ALIGN(len + sizeof(struct nlmsghdr));
+ if (__predict_false(nw->offset + required_len > nw->alloc_len)) {
+ if (!nlmsg_refill_buffer(nw, required_len))
+ return (false);
+ }
+
+ hdr = (struct nlmsghdr *)(&nw->data[nw->offset]);
+
+ hdr->nlmsg_len = len;
+ hdr->nlmsg_type = type;
+ hdr->nlmsg_flags = flags;
+ hdr->nlmsg_seq = seq;
+ hdr->nlmsg_pid = portid;
+
+ nw->hdr = hdr;
+ nw->offset += sizeof(struct nlmsghdr);
+
+ return (true);
+}
+
+bool
+nlmsg_end(struct nl_writer *nw)
+{
+ MPASS(nw->hdr != NULL);
+
+ if (nw->enomem) {
+ NL_LOG(LOG_DEBUG, "ENOMEM when dumping message");
+ nlmsg_abort(nw);
+ return (false);
+ }
+
+ nw->hdr->nlmsg_len = (uint32_t)(nw->data + nw->offset - (char *)nw->hdr);
+ nw->hdr = NULL;
+ nw->num_messages++;
+ return (true);
+}
+
+void
+nlmsg_abort(struct nl_writer *nw)
+{
+ if (nw->hdr != NULL) {
+ nw->offset = (uint32_t)((char *)nw->hdr - nw->data);
+ nw->hdr = NULL;
+ }
+}
+
+void
+nlmsg_ack(struct nlpcb *nlp, int error, struct nlmsghdr *hdr,
+ struct nl_pstate *npt)
+{
+ struct nlmsgerr *errmsg;
+ int payload_len;
+ uint32_t flags = nlp->nl_flags;
+ struct nl_writer *nw = npt->nw;
+ bool cap_ack;
+
+ payload_len = sizeof(struct nlmsgerr);
+
+ /*
+ * The only case when we send the full message in the
+ * reply is when there is an error and NETLINK_CAP_ACK
+ * is not set.
+ */
+ cap_ack = (error == 0) || (flags & NLF_CAP_ACK);
+ if (!cap_ack)
+ payload_len += hdr->nlmsg_len - sizeof(struct nlmsghdr);
+ payload_len = NETLINK_ALIGN(payload_len);
+
+ uint16_t nl_flags = cap_ack ? NLM_F_CAPPED : 0;
+ if ((npt->err_msg || npt->err_off) && nlp->nl_flags & NLF_EXT_ACK)
+ nl_flags |= NLM_F_ACK_TLVS;
+
+ /*
+ * TODO: handle cookies
+ */
+
+ NL_LOG(LOG_DEBUG3, "acknowledging message type %d seq %d",
+ hdr->nlmsg_type, hdr->nlmsg_seq);
+
+ if (!nlmsg_add(nw, nlp->nl_port, hdr->nlmsg_seq, NLMSG_ERROR, nl_flags, payload_len))
+ goto enomem;
+
+ errmsg = nlmsg_reserve_data(nw, payload_len, struct nlmsgerr);
+ errmsg->error = error;
+ /* In case of error copy the whole message, else just the header */
+ memcpy(&errmsg->msg, hdr, cap_ack ? sizeof(*hdr) : hdr->nlmsg_len);
+
+ if (npt->err_msg != NULL && nlp->nl_flags & NLF_EXT_ACK)
+ nlattr_add_string(nw, NLMSGERR_ATTR_MSG, npt->err_msg);
+ if (npt->err_off != 0 && nlp->nl_flags & NLF_EXT_ACK)
+ nlattr_add_u32(nw, NLMSGERR_ATTR_OFFS, npt->err_off);
+
+ if (nlmsg_end(nw))
+ return;
+enomem:
+ NLP_LOG(LOG_DEBUG, nlp, "error allocating ack data for message %d seq %u",
+ hdr->nlmsg_type, hdr->nlmsg_seq);
+ nlmsg_abort(nw);
+}
+
+bool
+nlmsg_end_dump(struct nl_writer *nw, int error, struct nlmsghdr *hdr)
+{
+ if (!nlmsg_add(nw, hdr->nlmsg_pid, hdr->nlmsg_seq, NLMSG_DONE, 0, sizeof(int))) {
+ NL_LOG(LOG_DEBUG, "Error finalizing table dump");
+ return (false);
+ }
+ /* Save operation result */
+ int *perror = nlmsg_reserve_object(nw, int);
+ NL_LOG(LOG_DEBUG2, "record error=%d at off %d (%p)", error,
+ nw->offset, perror);
+ *perror = error;
+ nlmsg_end(nw);
+
+ return (true);
+}
diff --git a/sys/netlink/netlink_module.c b/sys/netlink/netlink_module.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_module.c
@@ -0,0 +1,228 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Ng Peng Nam Sean
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include <sys/param.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+
+#include <sys/lock.h>
+#include <sys/rmlock.h>
+#include <sys/ck.h>
+#include <sys/syslog.h>
+
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_var.h>
+
+#include <machine/atomic.h>
+
+MALLOC_DEFINE(M_NETLINK, "netlink", "Memory used for netlink packets");
+
+#define DEBUG_MOD_NAME nl_mod
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG);
+
+SYSCTL_NODE(_net, OID_AUTO, netlink, CTLFLAG_RD, 0, "");
+SYSCTL_NODE(_net_netlink, OID_AUTO, debug, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
+
+#define NL_MAX_HANDLERS 20
+struct nl_proto_handler _nl_handlers[NL_MAX_HANDLERS];
+struct nl_proto_handler *nl_handlers = _nl_handlers;
+
+CK_LIST_HEAD(nl_control_head, nl_control);
+static struct nl_control_head vnets_head = CK_LIST_HEAD_INITIALIZER();
+
+VNET_DEFINE(struct nl_control *, nl_ctl) = NULL;
+
+struct mtx nl_global_mtx;
+MTX_SYSINIT(nl_global_mtx, &nl_global_mtx, "global netlink lock", MTX_DEF);
+
+#define NL_GLOBAL_LOCK() mtx_lock(&nl_global_mtx)
+#define NL_GLOBAL_UNLOCK() mtx_unlock(&nl_global_mtx)
+
+int netlink_unloading = 0;
+
+static void
+free_nl_ctl(struct nl_control *ctl)
+{
+ rm_destroy(&ctl->ctl_lock);
+ free(ctl, M_NETLINK);
+}
+
+struct nl_control *
+vnet_nl_ctl_init(void)
+{
+ struct nl_control *ctl;
+
+ ctl = malloc(sizeof(struct nl_control), M_NETLINK, M_WAITOK | M_ZERO);
+ rm_init(&ctl->ctl_lock, "netlink lock");
+ CK_LIST_INIT(&ctl->ctl_port_head);
+ CK_LIST_INIT(&ctl->ctl_pcb_head);
+
+ NL_GLOBAL_LOCK();
+
+ struct nl_control *tmp = atomic_load_ptr(&V_nl_ctl);
+
+ if (tmp == NULL) {
+ atomic_store_ptr(&V_nl_ctl, ctl);
+ CK_LIST_INSERT_HEAD(&vnets_head, ctl, ctl_next);
+ NL_LOG(LOG_DEBUG2, "VNET %p init done, inserted %p into global list",
+ curvnet, ctl);
+ } else {
+ NL_LOG(LOG_DEBUG, "per-VNET init clash, dropping this instance");
+ free_nl_ctl(ctl);
+ ctl = tmp;
+ }
+
+ NL_GLOBAL_UNLOCK();
+
+ return (ctl);
+}
+
+static void
+vnet_nl_ctl_destroy(const void *unused __unused)
+{
+ struct nl_control *ctl;
+
+ /* Assume at the time all of the processes / sockets are dead */
+
+ NL_GLOBAL_LOCK();
+ ctl = atomic_load_ptr(&V_nl_ctl);
+ atomic_store_ptr(&V_nl_ctl, NULL);
+ if (ctl != NULL) {
+ NL_LOG(LOG_DEBUG2, "Removing %p from global list", ctl);
+ CK_LIST_REMOVE(ctl, ctl_next);
+ }
+ NL_GLOBAL_UNLOCK();
+
+ if (ctl != NULL)
+ free_nl_ctl(ctl);
+}
+VNET_SYSUNINIT(vnet_nl_ctl_destroy, SI_SUB_PROTO_IF, SI_ORDER_ANY,
+ vnet_nl_ctl_destroy, NULL);
+
+int
+nl_verify_proto(int proto)
+{
+ if (proto < 0 || proto >= NL_MAX_HANDLERS) {
+ return (EINVAL);
+ }
+ int handler_defined = nl_handlers[proto].cb != NULL;
+ return (handler_defined ? 0 : EPROTONOSUPPORT);
+}
+
+const char *
+nl_get_proto_name(int proto)
+{
+ return (nl_handlers[proto].proto_name);
+}
+
+bool
+netlink_register_proto(int proto, const char *proto_name, nl_handler_f handler)
+{
+ if ((proto < 0) || (proto >= NL_MAX_HANDLERS))
+ return (false);
+ NL_GLOBAL_LOCK();
+ KASSERT((nl_handlers[proto].cb == NULL), ("netlink handler %d is already set", proto));
+ nl_handlers[proto].cb = handler;
+ nl_handlers[proto].proto_name = proto_name;
+ NL_GLOBAL_UNLOCK();
+ NL_LOG(LOG_DEBUG, "Registered netlink %s(%d) handler", proto_name, proto);
+ return (true);
+}
+
+bool
+netlink_unregister_proto(int proto)
+{
+ if ((proto < 0) || (proto >= NL_MAX_HANDLERS))
+ return (false);
+ NL_GLOBAL_LOCK();
+ KASSERT((nl_handlers[proto].cb != NULL), ("netlink handler %d is not set", proto));
+ nl_handlers[proto].cb = NULL;
+ nl_handlers[proto].proto_name = NULL;
+ NL_GLOBAL_UNLOCK();
+ NL_LOG(LOG_DEBUG, "Unregistered netlink proto %d handler", proto);
+ return (true);
+}
+
+static bool
+can_unload(void)
+{
+ struct nl_control *ctl;
+ bool result = true;
+
+ NL_GLOBAL_LOCK();
+
+ CK_LIST_FOREACH(ctl, &vnets_head, ctl_next) {
+ NL_LOG(LOG_DEBUG2, "Iterating VNET head %p", ctl);
+ if (!CK_LIST_EMPTY(&ctl->ctl_pcb_head)) {
+ NL_LOG(LOG_NOTICE, "non-empty socket list in ctl %p", ctl);
+ result = false;
+ break;
+ }
+ }
+
+ NL_GLOBAL_UNLOCK();
+
+ return (result);
+}
+
+static int
+netlink_modevent(module_t mod __unused, int what, void *priv __unused)
+{
+ int ret = 0;
+
+ switch (what) {
+ case MOD_LOAD:
+ NL_LOG(LOG_DEBUG, "Loading");
+ NL_LOG(LOG_NOTICE, "netlink support is in BETA stage");
+ break;
+
+ case MOD_UNLOAD:
+ NL_LOG(LOG_DEBUG, "Unload called");
+ if (can_unload()) {
+ NL_LOG(LOG_WARNING, "unloading");
+ netlink_unloading = 1;
+ } else
+ ret = EBUSY;
+ break;
+
+ default:
+ ret = EOPNOTSUPP;
+ break;
+ }
+
+ return (ret);
+}
+static moduledata_t netlink_mod = { "netlink", netlink_modevent, NULL };
+
+DECLARE_MODULE(netlink, netlink_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
+MODULE_VERSION(netlink, 1);
diff --git a/sys/netlink/netlink_route.h b/sys/netlink/netlink_route.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_route.h
@@ -0,0 +1,43 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef _NETLINK_NETLINK_ROUTE_H_
+#define _NETLINK_NETLINK_ROUTE_H_
+
+#include <sys/types.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/if_var.h>
+
+#include <netlink/route/common.h>
+#include <netlink/route/ifaddrs.h>
+#include <netlink/route/interface.h>
+#include <netlink/route/neigh.h>
+#include <netlink/route/route.h>
+#include <netlink/route/nexthop.h>
+
+#endif
diff --git a/sys/netlink/netlink_route.c b/sys/netlink/netlink_route.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_route.c
@@ -0,0 +1,135 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include <sys/types.h>
+#include <sys/malloc.h>
+#include <sys/socket.h>
+#include <sys/ck.h>
+
+#include <net/route.h>
+#include <net/route/route_ctl.h>
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_var.h>
+#include <netlink/netlink_route.h>
+#include <netlink/route/route_var.h>
+
+#define DEBUG_MOD_NAME nl_route_core
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG);
+
+#define HANDLER_MAX_NUM (NL_RTM_MAX + 10)
+static const struct rtnl_cmd_handler *rtnl_handler[HANDLER_MAX_NUM] = {};
+
+bool
+rtnl_register_messages(const struct rtnl_cmd_handler *handlers, int count)
+{
+ for (int i = 0; i < count; i++) {
+ if (handlers[i].cmd >= HANDLER_MAX_NUM)
+ return (false);
+ MPASS(rtnl_handler[handlers[i].cmd] == NULL);
+ }
+ for (int i = 0; i < count; i++)
+ rtnl_handler[handlers[i].cmd] = &handlers[i];
+ return (true);
+}
+
+/*
+ * Handler called by netlink subsystem when matching netlink message is received
+ */
+static int
+rtnl_handle_message(struct nlmsghdr *hdr, struct nl_pstate *npt)
+{
+ const struct rtnl_cmd_handler *cmd;
+ struct epoch_tracker et;
+ struct nlpcb *nlp = npt->nlp;
+ int error = 0;
+
+ if (__predict_false(hdr->nlmsg_type >= HANDLER_MAX_NUM)) {
+ NLMSG_REPORT_ERR_MSG(npt, "unknown message type: %d", hdr->nlmsg_type);
+ return (ENOTSUP);
+ }
+
+ cmd = rtnl_handler[hdr->nlmsg_type];
+ if (__predict_false(cmd == NULL)) {
+ NLMSG_REPORT_ERR_MSG(npt, "unknown message type: %d", hdr->nlmsg_type);
+ return (ENOTSUP);
+ }
+
+ NLP_LOG(LOG_DEBUG2, nlp, "received msg %s(%d) len %d", cmd->name,
+ hdr->nlmsg_type, hdr->nlmsg_len);
+
+ if (cmd->priv != 0 && !nlp_has_priv(nlp, cmd->priv)) {
+ NLP_LOG(LOG_DEBUG2, nlp, "priv %d check failed for msg %s", cmd->priv, cmd->name);
+ return (EPERM);
+ } else if (cmd->priv != 0)
+ NLP_LOG(LOG_DEBUG3, nlp, "priv %d check passed for msg %s", cmd->priv, cmd->name);
+
+ bool need_epoch = !(cmd->flags & RTNL_F_NOEPOCH);
+
+ if (need_epoch)
+ NET_EPOCH_ENTER(et);
+ error = cmd->cb(hdr, nlp, npt);
+ if (need_epoch)
+ NET_EPOCH_EXIT(et);
+
+ NLP_LOG(LOG_DEBUG3, nlp, "message %s -> error %d", cmd->name, error);
+
+ return (error);
+}
+
+static struct rtbridge nlbridge = { .route_f = rtnl_handle_route_event };
+static struct rtbridge *nlbridge_orig_p;
+
+static void
+rtnl_load(void *u __unused)
+{
+ NL_LOG(LOG_NOTICE, "rtnl loading");
+ nlbridge_orig_p = netlink_callback_p;
+ netlink_callback_p = &nlbridge;
+ rtnl_neighs_init();
+ rtnl_ifaces_init();
+ rtnl_nexthops_init();
+ rtnl_routes_init();
+ netlink_register_proto(NETLINK_ROUTE, "NETLINK_ROUTE", rtnl_handle_message);
+}
+SYSINIT(rtnl_load, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rtnl_load, NULL);
+
+static void
+rtnl_unload(void *u __unused)
+{
+ netlink_callback_p = nlbridge_orig_p;
+ rtnl_ifaces_destroy();
+ rtnl_neighs_destroy();
+
+ /* Wait till all consumers read nlbridge data */
+ epoch_wait_preempt(net_epoch_preempt);
+}
+SYSUNINIT(rtnl_unload, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rtnl_unload, NULL);
diff --git a/sys/netlink/netlink_var.h b/sys/netlink/netlink_var.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_var.h
@@ -0,0 +1,142 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Ng Peng Nam Sean
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef _NETLINK_NETLINK_VAR_H_
+#define _NETLINK_NETLINK_VAR_H_
+
+#include <sys/ck.h>
+#include <sys/epoch.h>
+#include <sys/sysctl.h>
+#include <sys/taskqueue.h>
+#include <net/vnet.h>
+
+#define NLSNDQ 65536 /* Default socket sendspace */
+#define NLRCVQ 65536 /* Default socket recvspace */
+
+struct ucred;
+
+struct nl_io_queue {
+ struct mbuf *head;
+ struct mbuf *last;
+ int length;
+ int hiwat;
+};
+
+struct nlpcb {
+ struct socket *nl_socket;
+ uint64_t nl_groups;
+ uint32_t nl_port;
+ uint32_t nl_flags;
+ uint32_t nl_process_id;
+ int nl_proto;
+ bool nl_active;
+ bool nl_bound;
+ bool nl_task_pending;
+ bool nl_tx_blocked; /* No new requests accepted */
+ bool nl_linux; /* true if running under compat */
+ struct nl_io_queue rx_queue;
+ struct nl_io_queue tx_queue;
+ struct taskqueue *nl_taskqueue;
+ struct task nl_task;
+ struct ucred *nl_cred; /* Copy of nl_socket->so_cred */
+ uint64_t nl_dropped_bytes;
+ uint64_t nl_dropped_messages;
+ CK_LIST_ENTRY(nlpcb) nl_next;
+ CK_LIST_ENTRY(nlpcb) nl_port_next;
+ volatile u_int nl_refcount;
+ struct mtx nl_lock;
+ struct epoch_context nl_epoch_ctx;
+};
+#define sotonlpcb(so) ((struct nlpcb *)(so)->so_pcb)
+
+#define NLP_LOCK_INIT(_nlp) mtx_init(&((_nlp)->nl_lock), "nlp mtx", NULL, MTX_DEF)
+#define NLP_LOCK_DESTROY(_nlp) mtx_destroy(&((_nlp)->nl_lock))
+#define NLP_LOCK(_nlp) mtx_lock(&((_nlp)->nl_lock))
+#define NLP_UNLOCK(_nlp) mtx_unlock(&((_nlp)->nl_lock))
+
+#define ALIGNED_NL_SZ(_data) roundup2((((struct nlmsghdr *)(_data))->nlmsg_len), 16)
+
+/* nl_flags */
+#define NLF_CAP_ACK 0x01 /* Do not send message body with errmsg */
+#define NLF_EXT_ACK 0x02 /* Allow including extended TLVs in ack */
+#define NLF_STRICT 0x04 /* Perform strict header checks */
+
+SYSCTL_DECL(_net_netlink);
+
+struct nl_io {
+ struct callout callout;
+ struct mbuf *head;
+ struct mbuf *last;
+ int64_t length;
+};
+
+struct nl_control {
+ CK_LIST_HEAD(nl_pid_head, nlpcb) ctl_port_head;
+ CK_LIST_HEAD(nlpcb_head, nlpcb) ctl_pcb_head;
+ CK_LIST_ENTRY(nl_control) ctl_next;
+ struct nl_io ctl_io;
+ struct rmlock ctl_lock;
+};
+VNET_DECLARE(struct nl_control *, nl_ctl);
+#define V_nl_ctl VNET(nl_ctl)
+
+
+struct sockaddr_nl;
+struct sockaddr;
+struct nlmsghdr;
+
+/* netlink_module.c */
+struct nl_control *vnet_nl_ctl_init(void);
+
+int nl_verify_proto(int proto);
+const char *nl_get_proto_name(int proto);
+
+extern int netlink_unloading;
+
+struct nl_proto_handler {
+ nl_handler_f cb;
+ const char *proto_name;
+};
+extern struct nl_proto_handler *nl_handlers;
+
+/* netlink_domain.c */
+void nl_send_group(struct mbuf *m, int cnt, int proto, int group_id);
+
+/* netlink_io.c */
+#define NL_IOF_UNTRANSLATED 0x01
+#define NL_IOF_IGNORE_LIMIT 0x02
+bool nl_send_one(struct mbuf *m, struct nlpcb *nlp, int cnt, int io_flags);
+void nlmsg_ack(struct nlpcb *nlp, int error, struct nlmsghdr *nlmsg,
+ struct nl_pstate *npt);
+void nl_on_transmit(struct nlpcb *nlp);
+void nl_free_io(struct nlpcb *nlp);
+
+void nl_taskqueue_handler(void *_arg, int pending);
+int nl_receive_async(struct mbuf *m, struct socket *so);
+void nl_process_receive_locked(struct nlpcb *nlp);
+
+#endif
diff --git a/sys/netlink/route/common.h b/sys/netlink/route/common.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/common.h
@@ -0,0 +1,213 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Common defines for all parts of the NETLINK_ROUTE family
+ */
+#ifndef _NETLINK_ROUTE_COMMON_H_
+#define _NETLINK_ROUTE_COMMON_H_
+
+/* Defined NETLINK_ROUTE messages */
+enum {
+ NL_RTM_BASE = 16,
+ NL_RTM_NEWLINK = 16, /* creates new interface */
+ NL_RTM_DELLINK = 17, /* deletes matching interface */
+ NL_RTM_GETLINK = 18, /* lists matching interfaces */
+ NL_RTM_SETLINK = 19, /* not supported */
+ NL_RTM_NEWADDR = 20, /* not supported */
+ NL_RTM_DELADDR = 21, /* not supported */
+ NL_RTM_GETADDR = 22, /* lists matching ifaddrs */
+ NL_RTM_NEWROUTE = 24, /* adds or changes a route */
+ NL_RTM_DELROUTE = 25, /* deletes matching route */
+ NL_RTM_GETROUTE = 26, /* lists matching routes */
+ NL_RTM_NEWNEIGH = 28, /* creates new arp/ndp entry */
+ NL_RTM_DELNEIGH = 29, /* deletes matching arp/ndp entry */
+ NL_RTM_GETNEIGH = 30, /* lists matching arp/ndp entry */
+ NL_RTM_NEWRULE = 32, /* not supported */
+ NL_RTM_DELRULE = 33, /* not supported */
+ NL_RTM_GETRULE = 34, /* not supported */
+ NL_RTM_NEWQDISC = 36, /* not supported */
+ NL_RTM_DELQDISC = 37, /* not supported */
+ NL_RTM_GETQDISC = 38, /* not supported */
+ NL_RTM_NEWTCLASS = 40, /* not supported */
+ NL_RTM_DELTCLASS = 41, /* not supported */
+ NL_RTM_GETTCLASS = 42, /* not supported */
+ NL_RTM_NEWTFILTER = 44, /* not supported */
+ NL_RTM_DELTFILTER = 45, /* not supported */
+ NL_RTM_GETTFILTER = 46, /* not supported */
+ NL_RTM_NEWACTION = 48, /* not supported */
+ NL_RTM_DELACTION = 49, /* not supported */
+ NL_RTM_GETACTION = 50, /* not supported */
+ NL_RTM_NEWPREFIX = 52, /* not supported */
+ NL_RTM_GETMULTICAST = 58, /* not supported */
+ NL_RTM_GETANYCAST = 62, /* not supported */
+ NL_RTM_NEWNEIGHTBL = 64, /* not supported */
+ NL_RTM_GETNEIGHTBL = 66, /* not supported */
+ NL_RTM_SETNEIGHTBL = 67, /* not supported */
+ NL_RTM_NEWNDUSEROPT = 68, /* not supported */
+ NL_RTM_NEWADDRLABEL = 72, /* not supported */
+ NL_RTM_DELADDRLABEL = 73, /* not supported */
+ NL_RTM_GETADDRLABEL = 74, /* not supported */
+ NL_RTM_GETDCB = 78, /* not supported */
+ NL_RTM_SETDCB = 79, /* not supported */
+ NL_RTM_NEWNETCONF = 80, /* not supported */
+ NL_RTM_GETNETCONF = 82, /* not supported */
+ NL_RTM_NEWMDB = 84, /* not supported */
+ NL_RTM_DELMDB = 85, /* not supported */
+ NL_RTM_GETMDB = 86, /* not supported */
+ NL_RTM_NEWNSID = 88, /* not supported */
+ NL_RTM_DELNSID = 89, /* not supported */
+ NL_RTM_GETNSID = 90, /* not supported */
+ NL_RTM_NEWSTATS = 92, /* not supported */
+ NL_RTM_GETSTATS = 94, /* not supported */
+ NL_RTM_NEWNEXTHOP = 104, /* creates new user nexhtop */
+ NL_RTM_DELNEXTHOP = 105, /* deletes matching nexthop */
+ NL_RTM_GETNEXTHOP = 106, /* lists created user nexthops */
+ __NL_RTM_MAX,
+};
+#define NL_RTM_MAX (((__NL_RTM_MAX + 3) & ~3) - 1)
+
+#ifndef _KERNEL
+/*
+ * RTM_* namespace clashes with BSD rtsock namespace.
+ * Use NL_RTM_ prefix in the kernel and map it to RTM_
+ * for userland.
+ */
+#define RTM_BASE NL_RTM_BASE
+#define RTM_NEWLINK NL_RTM_NEWLINK
+#define RTM_DELLINK NL_RTM_DELLINK
+#define RTM_GETLINK NL_RTM_GETLINK
+#define RTM_SETLINK NL_RTM_SETLINK
+#define RTM_NEWADDR NL_RTM_NEWADDR
+#define RTM_DELADDR NL_RTM_DELADDR
+#define RTM_GETADDR NL_RTM_GETADDR
+#define RTM_NEWROUTE NL_RTM_NEWROUTE
+#define RTM_DELROUTE NL_RTM_DELROUTE
+#define RTM_GETROUTE NL_RTM_GETROUTE
+#define RTM_NEWNEXTHOP NL_RTM_NEWNEXTHOP
+#define RTM_DELNEXTHOP NL_RTM_DELNEXTHOP
+#define RTM_GETNEXTHOP NL_RTM_GETNEXTHOP
+#endif
+
+#ifndef _KERNEL
+/* rtnetlink multicast groups - backwards compatibility for userspace */
+#define RTMGRP_LINK 0x01
+#define RTMGRP_NOTIFY 0x02
+#define RTMGRP_NEIGH 0x04
+#define RTMGRP_TC 0x08
+
+#define RTMGRP_IPV4_IFADDR 0x10
+#define RTMGRP_IPV4_MROUTE 0x20
+#define RTMGRP_IPV4_ROUTE 0x40
+#define RTMGRP_IPV4_RULE 0x80
+
+#define RTMGRP_IPV6_IFADDR 0x100
+#define RTMGRP_IPV6_MROUTE 0x200
+#define RTMGRP_IPV6_ROUTE 0x400
+#define RTMGRP_IPV6_IFINFO 0x800
+
+#define RTMGRP_DECnet_IFADDR 0x1000
+#define RTMGRP_DECnet_ROUTE 0x4000
+
+#define RTMGRP_IPV6_PREFIX 0x20000
+#endif
+
+/* Defined NETLINK_ROUTE multicast groups */
+enum rtnetlink_groups {
+ RTNLGRP_NONE,
+#define RTNLGRP_NONE RTNLGRP_NONE
+ RTNLGRP_LINK,
+#define RTNLGRP_LINK RTNLGRP_LINK
+ RTNLGRP_NOTIFY,
+#define RTNLGRP_NOTIFY RTNLGRP_NOTIFY
+ RTNLGRP_NEIGH,
+#define RTNLGRP_NEIGH RTNLGRP_NEIGH
+ RTNLGRP_TC,
+#define RTNLGRP_TC RTNLGRP_TC
+ RTNLGRP_IPV4_IFADDR,
+#define RTNLGRP_IPV4_IFADDR RTNLGRP_IPV4_IFADDR
+ RTNLGRP_IPV4_MROUTE,
+#define RTNLGRP_IPV4_MROUTE RTNLGRP_IPV4_MROUTE
+ RTNLGRP_IPV4_ROUTE,
+#define RTNLGRP_IPV4_ROUTE RTNLGRP_IPV4_ROUTE
+ RTNLGRP_IPV4_RULE,
+#define RTNLGRP_IPV4_RULE RTNLGRP_IPV4_RULE
+ RTNLGRP_IPV6_IFADDR,
+#define RTNLGRP_IPV6_IFADDR RTNLGRP_IPV6_IFADDR
+ RTNLGRP_IPV6_MROUTE,
+#define RTNLGRP_IPV6_MROUTE RTNLGRP_IPV6_MROUTE
+ RTNLGRP_IPV6_ROUTE,
+#define RTNLGRP_IPV6_ROUTE RTNLGRP_IPV6_ROUTE
+ RTNLGRP_IPV6_IFINFO,
+#define RTNLGRP_IPV6_IFINFO RTNLGRP_IPV6_IFINFO
+ RTNLGRP_DECnet_IFADDR,
+#define RTNLGRP_DECnet_IFADDR RTNLGRP_DECnet_IFADDR
+ RTNLGRP_NOP2,
+ RTNLGRP_DECnet_ROUTE,
+#define RTNLGRP_DECnet_ROUTE RTNLGRP_DECnet_ROUTE
+ RTNLGRP_DECnet_RULE,
+#define RTNLGRP_DECnet_RULE RTNLGRP_DECnet_RULE
+ RTNLGRP_NOP4,
+ RTNLGRP_IPV6_PREFIX,
+#define RTNLGRP_IPV6_PREFIX RTNLGRP_IPV6_PREFIX
+ RTNLGRP_IPV6_RULE,
+#define RTNLGRP_IPV6_RULE RTNLGRP_IPV6_RULE
+ RTNLGRP_ND_USEROPT,
+#define RTNLGRP_ND_USEROPT RTNLGRP_ND_USEROPT
+ RTNLGRP_PHONET_IFADDR,
+#define RTNLGRP_PHONET_IFADDR RTNLGRP_PHONET_IFADDR
+ RTNLGRP_PHONET_ROUTE,
+#define RTNLGRP_PHONET_ROUTE RTNLGRP_PHONET_ROUTE
+ RTNLGRP_DCB,
+#define RTNLGRP_DCB RTNLGRP_DCB
+ RTNLGRP_IPV4_NETCONF,
+#define RTNLGRP_IPV4_NETCONF RTNLGRP_IPV4_NETCONF
+ RTNLGRP_IPV6_NETCONF,
+#define RTNLGRP_IPV6_NETCONF RTNLGRP_IPV6_NETCONF
+ RTNLGRP_MDB,
+#define RTNLGRP_MDB RTNLGRP_MDB
+ RTNLGRP_MPLS_ROUTE,
+#define RTNLGRP_MPLS_ROUTE RTNLGRP_MPLS_ROUTE
+ RTNLGRP_NSID,
+#define RTNLGRP_NSID RTNLGRP_NSID
+ RTNLGRP_MPLS_NETCONF,
+#define RTNLGRP_MPLS_NETCONF RTNLGRP_MPLS_NETCONF
+ RTNLGRP_IPV4_MROUTE_R,
+#define RTNLGRP_IPV4_MROUTE_R RTNLGRP_IPV4_MROUTE_R
+ RTNLGRP_IPV6_MROUTE_R,
+#define RTNLGRP_IPV6_MROUTE_R RTNLGRP_IPV6_MROUTE_R
+ RTNLGRP_NEXTHOP,
+#define RTNLGRP_NEXTHOP RTNLGRP_NEXTHOP
+ RTNLGRP_BRVLAN,
+#define RTNLGRP_BRVLAN RTNLGRP_BRVLAN
+ __RTNLGRP_MAX
+};
+#define RTNLGRP_MAX (__RTNLGRP_MAX - 1)
+
+
+#endif
+
diff --git a/sys/netlink/route/iface.c b/sys/netlink/route/iface.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/iface.c
@@ -0,0 +1,857 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include "opt_inet.h"
+#include "opt_inet6.h"
+#include <sys/types.h>
+#include <sys/malloc.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/syslog.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+#include <net/if_var.h>
+#include <net/if_clone.h>
+#include <net/route.h>
+#include <net/route/nhop.h>
+#include <net/route/route_ctl.h>
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_route.h>
+#include <netlink/route/route_var.h>
+
+#include <netinet6/scope6_var.h> /* scope deembedding */
+
+#define DEBUG_MOD_NAME nl_iface
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG);
+
+struct netlink_walkargs {
+ struct nl_writer *nw;
+ struct nlmsghdr hdr;
+ struct nlpcb *so;
+ uint32_t fibnum;
+ int family;
+ int error;
+ int count;
+ int dumped;
+};
+
+static eventhandler_tag ifdetach_event, ifattach_event, ifaddr_event;
+
+static SLIST_HEAD(, nl_cloner) nl_cloners = SLIST_HEAD_INITIALIZER(nl_cloners);
+
+static struct sx rtnl_cloner_lock;
+SX_SYSINIT(rtnl_cloner_lock, &rtnl_cloner_lock, "rtnl cloner lock");
+
+/*
+ * RTM_GETLINK request
+ * sendto(3, {{len=32, type=RTM_GETLINK, flags=NLM_F_REQUEST|NLM_F_DUMP, seq=1641940952, pid=0},
+ * {ifi_family=AF_INET, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0}}, 32, 0, NULL, 0) = 32
+ *
+ * Reply:
+ * {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_ETHER, ifi_index=if_nametoindex("enp0s31f6"), ifi_flags=IFF_UP|IFF_BROADCAST|IFF_RUNNING|IFF_MULTICAST|IFF_LOWER_UP, ifi_change=0},
+{{nla_len=10, nla_type=IFLA_ADDRESS}, "\xfe\x54\x00\x52\x3e\x90"}
+
+[
+{{nla_len=14, nla_type=IFLA_IFNAME}, "enp0s31f6"},
+{{nla_len=8, nla_type=IFLA_TXQLEN}, 1000},
+{{nla_len=5, nla_type=IFLA_OPERSTATE}, 6},
+{{nla_len=5, nla_type=IFLA_LINKMODE}, 0},
+{{nla_len=8, nla_type=IFLA_MTU}, 1500},
+{{nla_len=8, nla_type=IFLA_MIN_MTU}, 68},
+ {{nla_len=8, nla_type=IFLA_MAX_MTU}, 9000},
+{{nla_len=8, nla_type=IFLA_GROUP}, 0},
+{{nla_len=8, nla_type=IFLA_PROMISCUITY}, 0},
+{{nla_len=8, nla_type=IFLA_NUM_TX_QUEUES}, 1},
+{{nla_len=8, nla_type=IFLA_GSO_MAX_SEGS}, 65535},
+{{nla_len=8, nla_type=IFLA_GSO_MAX_SIZE}, 65536},
+{{nla_len=8, nla_type=IFLA_NUM_RX_QUEUES}, 1},
+{{nla_len=5, nla_type=IFLA_CARRIER}, 1},
+{{nla_len=13, nla_type=IFLA_QDISC}, "fq_codel"},
+{{nla_len=8, nla_type=IFLA_CARRIER_CHANGES}, 2},
+{{nla_len=5, nla_type=IFLA_PROTO_DOWN}, 0},
+{{nla_len=8, nla_type=IFLA_CARRIER_UP_COUNT}, 1},
+{{nla_len=8, nla_type=IFLA_CARRIER_DOWN_COUNT}, 1},
+ */
+
+struct if_state {
+ uint8_t ifla_operstate;
+ uint8_t ifla_carrier;
+};
+
+static void
+get_operstate_ether(struct ifnet *ifp, struct if_state *pstate)
+{
+ struct ifmediareq ifmr = {};
+ int error;
+ error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (void *)&ifmr);
+
+ if (error != 0) {
+ NL_LOG(LOG_DEBUG, "error calling SIOCGIFMEDIA on %s: %d",
+ if_name(ifp), error);
+ return;
+ }
+
+ switch (IFM_TYPE(ifmr.ifm_active)) {
+ case IFM_ETHER:
+ if (ifmr.ifm_status & IFM_ACTIVE) {
+ pstate->ifla_carrier = 1;
+ if (ifp->if_flags & IFF_MONITOR)
+ pstate->ifla_operstate = IF_OPER_DORMANT;
+ else
+ pstate->ifla_operstate = IF_OPER_UP;
+ } else
+ pstate->ifla_operstate = IF_OPER_DOWN;
+ }
+}
+
+static bool
+get_stats(struct nl_writer *nw, struct ifnet *ifp)
+{
+ struct rtnl_link_stats64 *stats;
+
+ int nla_len = sizeof(struct nlattr) + sizeof(*stats);
+ struct nlattr *nla = nlmsg_reserve_data(nw, nla_len, struct nlattr);
+ if (nla == NULL)
+ return (false);
+ nla->nla_type = IFLA_STATS64;
+ nla->nla_len = nla_len;
+ stats = (struct rtnl_link_stats64 *)(nla + 1);
+
+ stats->rx_packets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS);
+ stats->tx_packets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS);
+ stats->rx_bytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES);
+ stats->tx_bytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES);
+ stats->rx_errors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS);
+ stats->tx_errors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS);
+ stats->rx_dropped = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS);
+ stats->tx_dropped = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS);
+ stats->multicast = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS);
+ stats->rx_nohandler = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO);
+
+ return (true);
+}
+
+static void
+get_operstate(struct ifnet *ifp, struct if_state *pstate)
+{
+ pstate->ifla_operstate = IF_OPER_UNKNOWN;
+ pstate->ifla_carrier = 0; /* no carrier */
+
+ switch (ifp->if_type) {
+ case IFT_ETHER:
+ get_operstate_ether(ifp, pstate);
+ break;
+ case IFT_LOOP:
+ if (ifp->if_flags & IFF_UP) {
+ pstate->ifla_operstate = IF_OPER_UP;
+ pstate->ifla_carrier = 1;
+ } else
+ pstate->ifla_operstate = IF_OPER_DOWN;
+ break;
+ }
+}
+
+static unsigned
+ifp_flags_to_netlink(const struct ifnet *ifp)
+{
+ return (ifp->if_flags | ifp->if_drv_flags);
+}
+
+#define LLADDR_CONST(s) ((const void *)((s)->sdl_data + (s)->sdl_nlen))
+static bool
+dump_sa(struct nl_writer *nw, int attr, const struct sockaddr *sa)
+{
+ uint32_t addr_len = 0;
+ const void *addr_data = NULL;
+ struct in6_addr addr6;
+
+ if (sa == NULL)
+ return (true);
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ addr_len = sizeof(struct in_addr);
+ addr_data = &((const struct sockaddr_in *)sa)->sin_addr;
+ break;
+ case AF_INET6:
+ in6_splitscope(&((const struct sockaddr_in6 *)sa)->sin6_addr, &addr6, &addr_len);
+ addr_len = sizeof(struct in6_addr);
+ addr_data = &addr6;
+ break;
+ case AF_LINK:
+ addr_len = ((const struct sockaddr_dl *)sa)->sdl_alen;
+ addr_data = LLADDR_CONST((const struct sockaddr_dl *)sa);
+ break;
+ default:
+ NL_LOG(LOG_DEBUG, "unsupported family: %d, skipping", sa->sa_family);
+ return (true);
+ }
+
+ return (nlattr_add(nw, attr, addr_len, addr_data));
+}
+
+/*
+ * Dumps interface state, properties and metrics.
+ * @nw: message writer
+ * @ifp: target interface
+ * @hdr: template header
+ *
+ * This function is called without epoch and MAY sleep.
+ */
+static bool
+dump_iface(struct nl_writer *nw, struct ifnet *ifp, const struct nlmsghdr *hdr)
+{
+ struct ifinfomsg *ifinfo;
+
+ NL_LOG(LOG_DEBUG3, "dumping interface %s data", if_name(ifp));
+
+ if (!nlmsg_reply(nw, hdr, sizeof(struct ifinfomsg)))
+ goto enomem;
+
+ ifinfo = nlmsg_reserve_object(nw, struct ifinfomsg);
+ ifinfo->ifi_family = AF_UNSPEC;
+ ifinfo->__ifi_pad = 0;
+ ifinfo->ifi_type = ifp->if_type;
+ ifinfo->ifi_index = ifp->if_index;
+ ifinfo->ifi_flags = ifp_flags_to_netlink(ifp);
+ ifinfo->ifi_change = 0;
+
+ nlattr_add_string(nw, IFLA_IFNAME, if_name(ifp));
+
+ struct if_state ifs = {};
+ get_operstate(ifp, &ifs);
+
+ nlattr_add_u8(nw, IFLA_OPERSTATE, ifs.ifla_operstate);
+ nlattr_add_u8(nw, IFLA_CARRIER, ifs.ifla_carrier);
+
+/*
+ nlattr_add_u8(nw, IFLA_PROTO_DOWN, val);
+ nlattr_add_u8(nw, IFLA_LINKMODE, val);
+*/
+ if ((ifp->if_addr != NULL)) {
+ dump_sa(nw, IFLA_ADDRESS, ifp->if_addr->ifa_addr);
+ }
+
+ if ((ifp->if_broadcastaddr != NULL)) {
+ nlattr_add(nw, IFLA_BROADCAST, ifp->if_addrlen,
+ ifp->if_broadcastaddr);
+ }
+
+ nlattr_add_u32(nw, IFLA_MTU, ifp->if_mtu);
+/*
+ nlattr_add_u32(nw, IFLA_MIN_MTU, 60);
+ nlattr_add_u32(nw, IFLA_MAX_MTU, 9000);
+ nlattr_add_u32(nw, IFLA_GROUP, 0);
+*/
+ get_stats(nw, ifp);
+
+ uint32_t val = (ifp->if_flags & IFF_PROMISC) != 0;
+ nlattr_add_u32(nw, IFLA_PROMISCUITY, val);
+
+ if (nlmsg_end(nw))
+ return (true);
+
+enomem:
+ NL_LOG(LOG_DEBUG, "unable to dump interface %s state (ENOMEM)", if_name(ifp));
+ nlmsg_abort(nw);
+ return (false);
+}
+
+static bool
+check_ifmsg(void *hdr, struct nl_pstate *npt)
+{
+ struct ifinfomsg *ifm = hdr;
+
+ if (ifm->__ifi_pad != 0 || ifm->ifi_type != 0 ||
+ ifm->ifi_flags != 0 || ifm->ifi_change != 0) {
+ nlmsg_report_err_msg(npt,
+ "strict checking: non-zero values in ifinfomsg header");
+ return (false);
+ }
+
+ return (true);
+}
+
+#define _IN(_field) offsetof(struct ifinfomsg, _field)
+#define _OUT(_field) offsetof(struct nl_parsed_link, _field)
+static const struct nlfield_parser nlf_p_if[] = {
+ { .off_in = _IN(ifi_type), .off_out = _OUT(ifi_type), .cb = nlf_get_u16 },
+ { .off_in = _IN(ifi_index), .off_out = _OUT(ifi_index), .cb = nlf_get_u32 },
+};
+
+static const struct nlattr_parser nla_p_linfo[] = {
+ { .type = IFLA_INFO_KIND, .off = _OUT(ifla_cloner), .cb = nlattr_get_stringn },
+ { .type = IFLA_INFO_DATA, .off = _OUT(ifla_idata), .cb = nlattr_get_nla },
+};
+NL_DECLARE_ATTR_PARSER(linfo_parser, nla_p_linfo);
+
+static const struct nlattr_parser nla_p_if[] = {
+ { .type = IFLA_IFNAME, .off = _OUT(ifla_ifname), .cb = nlattr_get_string },
+ { .type = IFLA_MTU, .off = _OUT(ifla_mtu), .cb = nlattr_get_uint32 },
+ { .type = IFLA_LINK, .off = _OUT(ifi_index), .cb = nlattr_get_uint32 },
+ { .type = IFLA_LINKINFO, .arg = &linfo_parser, .cb = nlattr_get_nested },
+ { .type = IFLA_GROUP, .off = _OUT(ifla_group), .cb = nlattr_get_string },
+ { .type = IFLA_ALT_IFNAME, .off = _OUT(ifla_ifname), .cb = nlattr_get_string },
+};
+#undef _IN
+#undef _OUT
+NL_DECLARE_STRICT_PARSER(ifmsg_parser, struct ifinfomsg, check_ifmsg, nlf_p_if, nla_p_if);
+
+static bool
+match_iface(struct nl_parsed_link *attrs, struct ifnet *ifp)
+{
+ if (attrs->ifi_index != 0 && attrs->ifi_index != ifp->if_index)
+ return (false);
+ if (attrs->ifi_type != 0 && attrs->ifi_index != ifp->if_type)
+ return (false);
+ if (attrs->ifla_ifname != NULL && strcmp(attrs->ifla_ifname, if_name(ifp)))
+ return (false);
+ /* TODO: add group match */
+
+ return (true);
+}
+
+/*
+ * {nlmsg_len=52, nlmsg_type=RTM_GETLINK, nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=1662842818, nlmsg_pid=0},
+ * {ifi_family=AF_PACKET, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0},
+ * [
+ * [{nla_len=10, nla_type=IFLA_IFNAME}, "vnet9"],
+ * [{nla_len=8, nla_type=IFLA_EXT_MASK}, RTEXT_FILTER_VF]
+ * ]
+ */
+static int
+rtnl_handle_getlink(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt)
+{
+ struct epoch_tracker et;
+ struct ifnet *ifp;
+ int error = 0;
+
+ struct nl_parsed_link attrs = {};
+ error = nl_parse_nlmsg(hdr, &ifmsg_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ struct netlink_walkargs wa = {
+ .so = nlp,
+ .nw = npt->nw,
+ .hdr.nlmsg_pid = hdr->nlmsg_pid,
+ .hdr.nlmsg_seq = hdr->nlmsg_seq,
+ .hdr.nlmsg_flags = hdr->nlmsg_flags | NLM_F_MULTI,
+ .hdr.nlmsg_type = NL_RTM_NEWLINK,
+ };
+
+ /* Fast track for an interface w/ explicit index match */
+ if (attrs.ifi_index != 0) {
+ NET_EPOCH_ENTER(et);
+ ifp = ifnet_byindex_ref(attrs.ifi_index);
+ NET_EPOCH_EXIT(et);
+ NLP_LOG(LOG_DEBUG3, nlp, "fast track -> searching index %u", attrs.ifi_index);
+ if (ifp != NULL) {
+ if (match_iface(&attrs, ifp)) {
+ if (!dump_iface(wa.nw, ifp, &wa.hdr))
+ error = ENOMEM;
+ } else
+ error = ESRCH;
+ if_rele(ifp);
+ } else
+ error = ESRCH;
+ return (error);
+ }
+
+ /*
+ * Fetching some link properties require performing ioctl's that may be blocking.
+ * Address it by saving referenced pointers of the matching links,
+ * exiting from epoch and going through the list one-by-one.
+ */
+
+ NL_LOG(LOG_DEBUG2, "Start dump");
+
+ struct ifnet **match_array;
+ int offset = 0, base_count = 16; /* start with 128 bytes */
+ match_array = malloc(base_count * sizeof(void *), M_TEMP, M_NOWAIT);
+
+ NLP_LOG(LOG_DEBUG3, nlp, "MATCHING: index=%u type=%d name=%s",
+ attrs.ifi_index, attrs.ifi_type, attrs.ifla_ifname);
+ NET_EPOCH_ENTER(et);
+ CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
+ wa.count++;
+ if (match_iface(&attrs, ifp)) {
+ if (offset < base_count) {
+ if (!if_try_ref(ifp))
+ continue;
+ match_array[offset++] = ifp;
+ continue;
+ }
+ /* Too many matches, need to reallocate */
+ struct ifnet **new_array;
+ int sz = base_count * sizeof(void *);
+ base_count *= 2;
+ new_array = malloc(sz * 2, M_TEMP, M_NOWAIT);
+ if (new_array == NULL) {
+ error = ENOMEM;
+ break;
+ }
+ memcpy(new_array, match_array, sz);
+ free(match_array, M_TEMP);
+ match_array = new_array;
+ }
+ }
+ NET_EPOCH_EXIT(et);
+
+ NL_LOG(LOG_DEBUG2, "Matched %d interface(s), dumping", offset);
+ for (int i = 0; error == 0 && i < offset; i++) {
+ if (!dump_iface(wa.nw, match_array[i], &wa.hdr))
+ error = ENOMEM;
+ }
+ for (int i = 0; i < offset; i++)
+ if_rele(match_array[i]);
+ free(match_array, M_TEMP);
+
+ NL_LOG(LOG_DEBUG2, "End dump, iterated %d dumped %d", wa.count, wa.dumped);
+
+ if (!nlmsg_end_dump(wa.nw, error, &wa.hdr)) {
+ NL_LOG(LOG_DEBUG, "Unable to finalize the dump");
+ return (ENOMEM);
+ }
+
+ return (error);
+}
+
+/*
+ * sendmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base=[
+ * {nlmsg_len=60, nlmsg_type=RTM_NEWLINK, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK|NLM_F_EXCL|NLM_F_CREATE, nlmsg_seq=1662715618, nlmsg_pid=0},
+ * {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0},
+ * {nla_len=11, nla_type=IFLA_IFNAME}, "dummy0"],
+ * [
+ * {nla_len=16, nla_type=IFLA_LINKINFO},
+ * [
+ * {nla_len=9, nla_type=IFLA_INFO_KIND}, "dummy"...
+ * ]
+ * ]
+ */
+
+static int
+rtnl_handle_dellink(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt)
+{
+ struct epoch_tracker et;
+ struct ifnet *ifp;
+ int error;
+
+ struct nl_parsed_link attrs = {};
+ error = nl_parse_nlmsg(hdr, &ifmsg_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ NET_EPOCH_ENTER(et);
+ ifp = ifnet_byindex_ref(attrs.ifi_index);
+ NET_EPOCH_EXIT(et);
+ if (ifp == NULL) {
+ NLP_LOG(LOG_DEBUG, nlp, "unable to find interface %u", attrs.ifi_index);
+ return (ENOENT);
+ }
+ NLP_LOG(LOG_DEBUG3, nlp, "mapped ifindex %u to %s", attrs.ifi_index, if_name(ifp));
+
+ sx_xlock(&ifnet_detach_sxlock);
+ error = if_clone_destroy(if_name(ifp));
+ sx_xunlock(&ifnet_detach_sxlock);
+
+ NLP_LOG(LOG_DEBUG2, nlp, "deleting interface %s returned %d", if_name(ifp), error);
+
+ if_rele(ifp);
+ return (error);
+}
+
+static int
+rtnl_handle_newlink(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt)
+{
+ struct nl_cloner *cloner;
+ int error;
+
+ struct nl_parsed_link attrs = {};
+ error = nl_parse_nlmsg(hdr, &ifmsg_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ if (attrs.ifla_ifname == NULL || strlen(attrs.ifla_ifname) == 0) {
+ /* Applications like ip(8) verify RTM_NEWLINK existance
+ * by calling it with empty arguments. Always return "innocent"
+ * error.
+ */
+ NLMSG_REPORT_ERR_MSG(npt, "empty IFLA_IFNAME attribute");
+ return (EPERM);
+ }
+
+ if (attrs.ifla_cloner == NULL || strlen(attrs.ifla_cloner) == 0) {
+ NLMSG_REPORT_ERR_MSG(npt, "empty IFLA_INFO_KIND attribute");
+ return (EINVAL);
+ }
+
+ sx_slock(&rtnl_cloner_lock);
+ SLIST_FOREACH(cloner, &nl_cloners, next) {
+ if (!strcmp(attrs.ifla_cloner, cloner->name)) {
+ error = cloner->create_f(&attrs, nlp, npt);
+ sx_sunlock(&rtnl_cloner_lock);
+ return (error);
+ }
+ }
+ sx_sunlock(&rtnl_cloner_lock);
+
+ /* TODO: load cloner module if not exists & privilege permits */
+ NLMSG_REPORT_ERR_MSG(npt, "interface type %s not supported", attrs.ifla_cloner);
+ return (ENOTSUP);
+
+ return (error);
+}
+
+/*
+
+{ifa_family=AF_INET, ifa_prefixlen=8, ifa_flags=IFA_F_PERMANENT, ifa_scope=RT_SCOPE_HOST, ifa_index=if_nametoindex("lo")},
+ [
+ {{nla_len=8, nla_type=IFA_ADDRESS}, inet_addr("127.0.0.1")},
+ {{nla_len=8, nla_type=IFA_LOCAL}, inet_addr("127.0.0.1")},
+ {{nla_len=7, nla_type=IFA_LABEL}, "lo"},
+ {{nla_len=8, nla_type=IFA_FLAGS}, IFA_F_PERMANENT},
+ {{nla_len=20, nla_type=IFA_CACHEINFO}, {ifa_prefered=4294967295, ifa_valid=4294967295, cstamp=3619, tstamp=3619}}]},
+---
+
+{{len=72, type=RTM_NEWADDR, flags=NLM_F_MULTI, seq=1642191126, pid=566735},
+ {ifa_family=AF_INET6, ifa_prefixlen=96, ifa_flags=IFA_F_PERMANENT, ifa_scope=RT_SCOPE_UNIVERSE, ifa_index=if_nametoindex("virbr0")},
+ [
+ {{nla_len=20, nla_type=IFA_ADDRESS}, inet_pton(AF_INET6, "2a01:4f8:13a:70c:ffff::1")},
+ {{nla_len=20, nla_type=IFA_CACHEINFO}, {ifa_prefered=4294967295, ifa_valid=4294967295, cstamp=4283, tstamp=4283}},
+ {{nla_len=8, nla_type=IFA_FLAGS}, IFA_F_PERMANENT}]},
+*/
+
+static uint8_t
+ifa_get_scope(const struct ifaddr *ifa)
+{
+ const struct sockaddr *sa;
+ uint8_t addr_scope = RT_SCOPE_UNIVERSE;
+
+ sa = ifa->ifa_addr;
+ switch (sa->sa_family) {
+ case AF_INET:
+ {
+ struct in_addr addr;
+ addr = ((const struct sockaddr_in *)sa)->sin_addr;
+ if (IN_LOOPBACK(addr.s_addr))
+ addr_scope = RT_SCOPE_HOST;
+ else if (IN_LINKLOCAL(addr.s_addr))
+ addr_scope = RT_SCOPE_LINK;
+ break;
+ }
+ case AF_INET6:
+ {
+ const struct in6_addr *addr;
+ addr = &((const struct sockaddr_in6 *)sa)->sin6_addr;
+ if (IN6_IS_ADDR_LOOPBACK(addr))
+ addr_scope = RT_SCOPE_HOST;
+ else if (IN6_IS_ADDR_LINKLOCAL(addr))
+ addr_scope = RT_SCOPE_LINK;
+ break;
+ }
+ }
+
+ return (addr_scope);
+}
+
+static uint8_t
+inet6_get_plen(const struct in6_addr *addr)
+{
+
+ return (bitcount32(addr->s6_addr32[0]) + bitcount32(addr->s6_addr32[1]) +
+ bitcount32(addr->s6_addr32[2]) + bitcount32(addr->s6_addr32[3]));
+}
+
+static uint8_t
+get_sa_plen(const struct sockaddr *sa)
+{
+ const struct in6_addr *paddr6;
+ const struct in_addr *paddr;
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ if (sa == NULL)
+ return (32);
+ paddr = &(((const struct sockaddr_in *)sa)->sin_addr);
+ return bitcount32(paddr->s_addr);;
+ case AF_INET6:
+ if (sa == NULL)
+ return (128);
+ paddr6 = &(((const struct sockaddr_in6 *)sa)->sin6_addr);
+ return inet6_get_plen(paddr6);
+ }
+
+ return (0);
+}
+
+
+/*
+ * {'attrs': [('IFA_ADDRESS', '12.0.0.1'),
+ ('IFA_LOCAL', '12.0.0.1'),
+ ('IFA_LABEL', 'eth10'),
+ ('IFA_FLAGS', 128),
+ ('IFA_CACHEINFO', {'ifa_preferred': 4294967295, 'ifa_valid': 4294967295, 'cstamp': 63745746, 'tstamp': 63745746})],
+ */
+static bool
+dump_iface_addr(struct nl_writer *nw, struct ifnet *ifp, struct ifaddr *ifa,
+ const struct nlmsghdr *hdr)
+{
+ struct ifaddrmsg *ifamsg;
+ struct sockaddr *sa = ifa->ifa_addr;
+
+ NL_LOG(LOG_DEBUG3, "dumping ifa %p type %s(%d) for interface %s",
+ ifa, rib_print_family(sa->sa_family), sa->sa_family, if_name(ifp));
+
+ if (!nlmsg_reply(nw, hdr, sizeof(struct ifaddrmsg)))
+ goto enomem;
+
+ ifamsg = nlmsg_reserve_object(nw, struct ifaddrmsg);
+ ifamsg->ifa_family = sa->sa_family;
+ ifamsg->ifa_prefixlen = get_sa_plen(ifa->ifa_netmask);
+ ifamsg->ifa_flags = 0; // ifa_flags is useless
+ ifamsg->ifa_scope = ifa_get_scope(ifa);
+ ifamsg->ifa_index = ifp->if_index;
+
+ struct sockaddr *dst_sa = ifa->ifa_dstaddr;
+ if ((dst_sa == NULL) || (dst_sa->sa_family != sa->sa_family))
+ dst_sa = sa;
+ dump_sa(nw, IFA_ADDRESS, dst_sa);
+ dump_sa(nw, IFA_LOCAL, sa);
+ nlattr_add_string(nw, IFA_LABEL, if_name(ifp));
+
+ uint32_t val = 0; // ifa->ifa_flags;
+ nlattr_add_u32(nw, IFA_FLAGS, val);
+
+ if (nlmsg_end(nw))
+ return (true);
+enomem:
+ NL_LOG(LOG_DEBUG, "Failed to dump ifa type %s(%d) for interface %s",
+ rib_print_family(sa->sa_family), sa->sa_family, if_name(ifp));
+ nlmsg_abort(nw);
+ return (false);
+}
+
+static int
+rtnl_handle_getaddr(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt)
+{
+ struct ifaddr *ifa;
+ struct ifnet *ifp;
+ int error = 0;
+
+ struct netlink_walkargs wa = {
+ .so = nlp,
+ .nw = npt->nw,
+ .hdr.nlmsg_pid = hdr->nlmsg_pid,
+ .hdr.nlmsg_seq = hdr->nlmsg_seq,
+ .hdr.nlmsg_flags = hdr->nlmsg_flags | NLM_F_MULTI,
+ .hdr.nlmsg_type = NL_RTM_NEWADDR,
+ };
+
+ NL_LOG(LOG_DEBUG2, "Start dump");
+
+ CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
+ CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+ if (wa.family != 0 && wa.family != ifa->ifa_addr->sa_family)
+ continue;
+ if (ifa->ifa_addr->sa_family == AF_LINK)
+ continue;
+ wa.count++;
+ if (!dump_iface_addr(wa.nw, ifp, ifa, &wa.hdr)) {
+ error = ENOMEM;
+ break;
+ }
+ wa.dumped++;
+ }
+ if (error != 0)
+ break;
+ }
+
+ NL_LOG(LOG_DEBUG2, "End dump, iterated %d dumped %d", wa.count, wa.dumped);
+
+ if (!nlmsg_end_dump(wa.nw, error, &wa.hdr)) {
+ NL_LOG(LOG_DEBUG, "Unable to finalize the dump");
+ return (ENOMEM);
+ }
+
+ return (error);
+}
+
+static void
+rtnl_handle_ifaddr(void *arg __unused, struct ifaddr *ifa, int cmd)
+{
+ struct nlmsghdr hdr = {};
+ struct nl_writer nw = {};
+ uint32_t group = 0;
+
+ switch (ifa->ifa_addr->sa_family) {
+ case AF_INET:
+ group = RTNLGRP_IPV4_IFADDR;
+ break;
+ case AF_INET6:
+ group = RTNLGRP_IPV6_IFADDR;
+ break;
+ default:
+ NL_LOG(LOG_DEBUG2, "ifa notification for unknown AF: %d",
+ ifa->ifa_addr->sa_family);
+ return;
+ }
+
+ if (!nl_has_listeners(NETLINK_ROUTE, group))
+ return;
+
+ if (!nlmsg_get_group_writer(&nw, NLMSG_LARGE, NETLINK_ROUTE, group)) {
+ NL_LOG(LOG_DEBUG, "error allocating group writer");
+ return;
+ }
+
+ hdr.nlmsg_type = (cmd == RTM_DELETE) ? NL_RTM_DELADDR : NL_RTM_NEWADDR;
+
+ dump_iface_addr(&nw, ifa->ifa_ifp, ifa, &hdr);
+ nlmsg_flush(&nw);
+}
+
+static void
+rtnl_handle_ifattach(void *arg, struct ifnet *ifp)
+{
+ struct nlmsghdr hdr = { .nlmsg_type = NL_RTM_NEWLINK };
+ struct nl_writer nw = {};
+
+ if (!nl_has_listeners(NETLINK_ROUTE, RTNLGRP_LINK))
+ return;
+
+ if (!nlmsg_get_group_writer(&nw, NLMSG_LARGE, NETLINK_ROUTE, RTNLGRP_LINK)) {
+ NL_LOG(LOG_DEBUG, "error allocating mbuf");
+ return;
+ }
+ dump_iface(&nw, ifp, &hdr);
+ nlmsg_flush(&nw);
+}
+
+static void
+rtnl_handle_ifdetach(void *arg, struct ifnet *ifp)
+{
+ struct nlmsghdr hdr = { .nlmsg_type = NL_RTM_DELLINK };
+ struct nl_writer nw = {};
+
+ if (!nl_has_listeners(NETLINK_ROUTE, RTNLGRP_LINK))
+ return;
+
+ if (!nlmsg_get_group_writer(&nw, NLMSG_LARGE, NETLINK_ROUTE, RTNLGRP_LINK)) {
+ NL_LOG(LOG_DEBUG, "error allocating mbuf");
+ return;
+ }
+ dump_iface(&nw, ifp, &hdr);
+ nlmsg_flush(&nw);
+}
+
+static const struct rtnl_cmd_handler cmd_handlers[] = {
+ {
+ .cmd = NL_RTM_GETLINK,
+ .name = "RTM_GETLINK",
+ .cb = &rtnl_handle_getlink,
+ .flags = RTNL_F_NOEPOCH,
+ },
+ {
+ .cmd = NL_RTM_DELLINK,
+ .name = "RTM_DELLINK",
+ .cb = &rtnl_handle_dellink,
+ .priv = PRIV_NET_IFDESTROY,
+ .flags = RTNL_F_NOEPOCH,
+ },
+ {
+ .cmd = NL_RTM_NEWLINK,
+ .name = "RTM_NEWLINK",
+ .cb = &rtnl_handle_newlink,
+ .priv = PRIV_NET_IFCREATE,
+ .flags = RTNL_F_NOEPOCH,
+ },
+ {
+ .cmd = NL_RTM_GETADDR,
+ .name = "RTM_GETADDR",
+ .cb = &rtnl_handle_getaddr,
+ },
+ {
+ .cmd = NL_RTM_NEWADDR,
+ .name = "RTM_NEWADDR",
+ .cb = &rtnl_handle_getaddr,
+ },
+ {
+ .cmd = NL_RTM_DELADDR,
+ .name = "RTM_DELADDR",
+ .cb = &rtnl_handle_getaddr,
+ },
+};
+
+static const struct nlhdr_parser *all_parsers[] = { &ifmsg_parser };
+
+void
+rtnl_iface_add_cloner(struct nl_cloner *cloner)
+{
+ sx_xlock(&rtnl_cloner_lock);
+ SLIST_INSERT_HEAD(&nl_cloners, cloner, next);
+ sx_xunlock(&rtnl_cloner_lock);
+}
+
+void rtnl_iface_del_cloner(struct nl_cloner *cloner)
+{
+ sx_xlock(&rtnl_cloner_lock);
+ SLIST_REMOVE(&nl_cloners, cloner, nl_cloner, next);
+ sx_xunlock(&rtnl_cloner_lock);
+}
+
+void
+rtnl_ifaces_init(void)
+{
+ ifattach_event = EVENTHANDLER_REGISTER(
+ ifnet_arrival_event, rtnl_handle_ifattach, NULL,
+ EVENTHANDLER_PRI_ANY);
+ ifdetach_event = EVENTHANDLER_REGISTER(
+ ifnet_departure_event, rtnl_handle_ifdetach, NULL,
+ EVENTHANDLER_PRI_ANY);
+ ifaddr_event = EVENTHANDLER_REGISTER(
+ rt_addrmsg, rtnl_handle_ifaddr, NULL,
+ EVENTHANDLER_PRI_ANY);
+ NL_VERIFY_PARSERS(all_parsers);
+ rtnl_iface_drivers_register();
+ rtnl_register_messages(cmd_handlers, NL_ARRAY_LEN(cmd_handlers));
+}
+
+void
+rtnl_ifaces_destroy(void)
+{
+ EVENTHANDLER_DEREGISTER(ifnet_arrival_event, ifattach_event);
+ EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_event);
+ EVENTHANDLER_DEREGISTER(rt_addrmsg, ifaddr_event);
+}
diff --git a/sys/netlink/route/iface_drivers.c b/sys/netlink/route/iface_drivers.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/iface_drivers.c
@@ -0,0 +1,165 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include "opt_inet.h"
+#include "opt_inet6.h"
+#include <sys/types.h>
+#include <sys/malloc.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/syslog.h>
+#include <sys/socketvar.h>
+
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+#include <net/if_var.h>
+#include <net/if_clone.h>
+#include <net/if_vlan_var.h>
+#include <net/route.h>
+#include <net/route/nhop.h>
+#include <net/route/route_ctl.h>
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_route.h>
+#include <netlink/route/route_var.h>
+
+#include <netinet6/scope6_var.h> /* scope deembedding */
+
+#define DEBUG_MOD_NAME nl_iface_drivers
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG);
+
+/*
+ *
+ * {len=76, type=RTM_NEWLINK, flags=NLM_F_REQUEST|NLM_F_ACK|NLM_F_EXCL|NLM_F_CREATE, seq=1662892737, pid=0},
+ * {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0},
+ * [
+ * {{nla_len=8, nla_type=IFLA_LINK}, 2},
+ * {{nla_len=12, nla_type=IFLA_IFNAME}, "xvlan22"},
+ * {{nla_len=24, nla_type=IFLA_LINKINFO},
+ * [
+ * {{nla_len=8, nla_type=IFLA_INFO_KIND}, "vlan"...},
+ * {{nla_len=12, nla_type=IFLA_INFO_DATA}, "\x06\x00\x01\x00\x16\x00\x00\x00"}]}]}, iov_len=76}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 76
+ */
+
+struct nl_parsed_vlan {
+ uint16_t vlan_id;
+ uint16_t vlan_proto;
+ struct ifla_vlan_flags vlan_flags;
+};
+
+#define _OUT(_field) offsetof(struct nl_parsed_vlan, _field)
+static const struct nlattr_parser nla_p_vlan[] = {
+ { .type = IFLA_VLAN_ID, .off = _OUT(vlan_id), .cb = nlattr_get_uint16 },
+ { .type = IFLA_VLAN_FLAGS, .off = _OUT(vlan_flags), .cb = nlattr_get_nla },
+ { .type = IFLA_VLAN_PROTOCOL, .off = _OUT(vlan_proto), .cb = nlattr_get_uint16 },
+};
+#undef _OUT
+NL_DECLARE_ATTR_PARSER(vlan_parser, nla_p_vlan);
+
+static int
+create_vlan(struct nl_parsed_link *lattrs, struct nlpcb *nlp, struct nl_pstate *npt)
+{
+ struct epoch_tracker et;
+ struct ifnet *ifp;
+ int error;
+
+ /*
+ * lattrs.ifla_ifname is the new interface name
+ * lattrs.ifi_index contains parent interface index
+ * lattrs.ifla_idata contains un-parsed vlan data
+ */
+
+ struct nl_parsed_vlan attrs = {
+ .vlan_id = 0xFEFE,
+ .vlan_proto = ETHERTYPE_VLAN
+ };
+ NLP_LOG(LOG_DEBUG3, nlp, "nested: %p len %d", lattrs->ifla_idata, lattrs->ifla_idata->nla_len);
+
+ if (lattrs->ifla_idata == NULL) {
+ NLMSG_REPORT_ERR_MSG(npt, "vlan id is required, guessing not supported");
+ return (ENOTSUP);
+ }
+
+ error = nl_parse_nested(lattrs->ifla_idata, &vlan_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+ if (attrs.vlan_id > 4095) {
+ NLMSG_REPORT_ERR_MSG(npt, "Invalid VID: %d", attrs.vlan_id);
+ return (EINVAL);
+ }
+ if (attrs.vlan_proto != ETHERTYPE_VLAN && attrs.vlan_proto != ETHERTYPE_QINQ) {
+ NLMSG_REPORT_ERR_MSG(npt, "Unsupported ethertype: 0x%04X", attrs.vlan_proto);
+ return (ENOTSUP);
+ }
+
+ NET_EPOCH_ENTER(et);
+ ifp = ifnet_byindex_ref(lattrs->ifi_index);
+ NET_EPOCH_EXIT(et);
+ if (ifp == NULL) {
+ NLP_LOG(LOG_DEBUG, nlp, "unable to find parent interface %u",
+ lattrs->ifi_index);
+ return (ENOENT);
+ }
+
+ /* Waiting till if_clone changes lands */
+/*
+ struct vlanreq params = {
+ .vlr_tag = attrs.vlan_id,
+ .vlr_proto = attrs.vlan_proto,
+ };
+*/
+ int ifname_len = strlen(lattrs->ifla_ifname) + 1;
+ error = if_clone_create(lattrs->ifla_ifname, ifname_len, (char *)NULL);
+
+ NLP_LOG(LOG_DEBUG2, nlp, "clone for %s returned %d", lattrs->ifla_ifname, error);
+
+ if_rele(ifp);
+ return (error);
+}
+
+static struct nl_cloner vlan_cloner = {
+ .name = "vlan",
+ .create_f = create_vlan,
+
+};
+
+static const struct nlhdr_parser *all_parsers[] = { &vlan_parser };
+
+void
+rtnl_iface_drivers_register(void)
+{
+ rtnl_iface_add_cloner(&vlan_cloner);
+ NL_VERIFY_PARSERS(all_parsers);
+}
+
+
diff --git a/sys/netlink/route/ifaddrs.h b/sys/netlink/route/ifaddrs.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/ifaddrs.h
@@ -0,0 +1,90 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Interface address-related (RTM_<NEW|DEL|GET>ADDR) message header and attributes.
+ */
+
+#ifndef _NETLINK_ROUTE_IFADDRS_H_
+#define _NETLINK_ROUTE_IFADDRS_H_
+
+/* Base header for all of the relevant messages */
+struct ifaddrmsg {
+ uint8_t ifa_family; /* Address family */
+ uint8_t ifa_prefixlen; /* Prefix length */
+ uint8_t ifa_flags; /* Address-specific flags */
+ uint8_t ifa_scope; /* Address scope */
+ uint32_t ifa_index; /* Link ifindex */
+};
+
+#ifndef _KERNEL
+#define _NL_IFA_HDRLEN ((int)sizeof(struct ifaddrmsg))
+#define IFA_RTA(_ifa) ((struct rtattr *)(NL_ITEM_DATA(_ifa, _NL_IFA_HDRLEN)))
+#define IFA_PAYLOAD(_hdr) NLMSG_PAYLOAD(_hdr, _NL_IFA_HDRLEN)
+#endif
+
+/* Defined attributes */
+enum {
+ IFA_UNSPEC,
+ IFA_ADDRESS = 1, /* binary, prefix address (destination for p2p) */
+ IFA_LOCAL = 2, /* binary, interface address */
+ IFA_LABEL = 3, /* not supported */
+ IFA_BROADCAST = 4, /* binary, broadcast ifa */
+ IFA_ANYCAST = 5, /* not supported */
+ IFA_CACHEINFO = 6, /* not supported */
+ IFA_MULTICAST = 7, /* not supported */
+ IFA_FLAGS = 8, /* not supported */
+ IFA_RT_PRIORITY = 9, /* not supported */
+ IFA_TARGET_NETNSID = 10, /* not supported */
+ __IFA_MAX,
+};
+#define IFA_MAX (__IFA_MAX - 1)
+
+/* IFA_FLAGS attribute flags */
+#define IFA_F_SECONDARY 0x0001
+#define IFA_F_TEMPORARY IFA_F_SECONDARY
+#define IFA_F_NODAD 0x0002
+#define IFA_F_OPTIMISTIC 0x0004
+#define IFA_F_DADFAILED 0x0008
+#define IFA_F_HOMEADDRESS 0x0010
+#define IFA_F_DEPRECATED 0x0020
+#define IFA_F_TENTATIVE 0x0040
+#define IFA_F_PERMANENT 0x0080
+#define IFA_F_MANAGETEMPADDR 0x0100
+#define IFA_F_NOPREFIXROUTE 0x0200
+#define IFA_F_MCAUTOJOIN 0x0400
+#define IFA_F_STABLE_PRIVACY 0x0800
+
+/* IFA_CACHEINFO value */
+struct ifa_cacheinfo {
+ uint32_t ifa_prefered;
+ uint32_t ifa_valid;
+ uint32_t cstamp;
+ uint32_t tstamp;
+};
+
+#endif
diff --git a/sys/netlink/route/interface.h b/sys/netlink/route/interface.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/interface.h
@@ -0,0 +1,245 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Interface-related (RTM_<NEW|DEL|GET|SET>LINK) message header and attributes.
+ */
+
+#ifndef _NETLINK_ROUTE_INTERFACE_H_
+#define _NETLINK_ROUTE_INTERFACE_H_
+
+/* Base header for all of the relevant messages */
+struct ifinfomsg {
+ unsigned char ifi_family; /* not used */
+ unsigned char __ifi_pad;
+ unsigned short ifi_type; /* ARPHRD_* */
+ int ifi_index; /* Inteface index */
+ unsigned ifi_flags; /* IFF_* flags */
+ unsigned ifi_change; /* IFF_* change mask */
+};
+
+#ifndef _KERNEL
+/* Compatilbility helpers */
+#define _IFINFO_HDRLEN ((int)sizeof(struct ifinfomsg))
+#define IFLA_RTA(_ifi) ((struct rtattr *)NL_ITEM_DATA(_ifi, _IFINFO_HDRLEN))
+#define IFLA_PAYLOAD(_ifi) NLMSG_PAYLOAD(_ifi, _IFINFO_HDRLEN)
+#endif
+
+enum {
+ IFLA_UNSPEC = 0,
+ IFLA_ADDRESS = 1, /* binary: Link-level address (MAC) */
+#define IFLA_ADDRESS IFLA_ADDRESS
+ IFLA_BROADCAST = 2, /* binary: link-level broadcast address */
+#define IFLA_BROADCAST IFLA_BROADCAST
+ IFLA_IFNAME = 3, /* string: Interface name */
+#define IFLA_IFNAME IFLA_IFNAME
+ IFLA_MTU = 4, /* u32: Current interface L3 mtu */
+#define IFLA_MTU IFLA_MTU
+ IFLA_LINK = 5, /* u32: interface index */
+#define IFLA_LINK IFLA_LINK
+ IFLA_QDISC = 6, /* string: Queing policy (not supported) */
+#define IFLA_QDISC IFLA_QDISC
+ IFLA_STATS = 7, /* Interface counters */
+#define IFLA_STATS IFLA_STATS
+ IFLA_COST = 8, /* not supported */
+#define IFLA_COST IFLA_COST
+ IFLA_PRIORITY = 9, /* not supported */
+#define IFLA_PRIORITY IFLA_PRIORITY
+ IFLA_MASTER = 10, /* u32: parent interface ifindex */
+#define IFLA_MASTER IFLA_MASTER
+ IFLA_WIRELESS = 11, /* not supported */
+#define IFLA_WIRELESS IFLA_WIRELESS
+ IFLA_PROTINFO = 12, /* protocol-specific data */
+#define IFLA_PROTINFO IFLA_PROTINFO
+ IFLA_TXQLEN = 13, /* u32: transmit queue length */
+#define IFLA_TXQLEN IFLA_TXQLEN
+ IFLA_MAP = 14, /* not supported */
+#define IFLA_MAP IFLA_MAP
+ IFLA_WEIGHT = 15, /* not supported */
+#define IFLA_WEIGHT IFLA_WEIGHT
+ IFLA_OPERSTATE = 16, /* u8: ifOperStatus per RFC 2863 */
+#define IFLA_OPERSTATE IFLA_OPERSTATE
+ IFLA_LINKMODE = 17, /* u8: ifmedia (not supported) */
+#define IFLA_LINKMODE IFLA_LINKMODE
+ IFLA_LINKINFO = 18, /* nested: IFLA_INFO_ */
+#define IFLA_LINKINFO IFLA_LINKINFO
+ IFLA_NET_NS_PID = 19, /* u32: vnet id (not supported) */
+#define IFLA_NET_NS_PID IFLA_NET_NS_PID
+ IFLA_IFALIAS = 20, /* not supported */
+#define IFLA_IFALIAS IFLA_IFALIAS
+ IFLA_NUM_VF = 21, /* not supported */
+#define IFLA_NUM_VF IFLA_NUM_VF
+ IFLA_VFINFO_LIST= 22, /* not supported */
+#define IFLA_VFINFO_LIST IFLA_VFINFO_LIST
+ IFLA_STATS64 = 23, /* rtnl_link_stats64: iface stats */
+#define IFLA_STATS64 IFLA_STATS64
+ IFLA_VF_PORTS,
+ IFLA_PORT_SELF,
+ IFLA_AF_SPEC,
+ IFLA_GROUP, /* Group the device belongs to */
+ IFLA_NET_NS_FD,
+ IFLA_EXT_MASK, /* Extended info mask, VFs, etc */
+ IFLA_PROMISCUITY, /* Promiscuity count: > 0 means acts PROMISC */
+#define IFLA_PROMISCUITY IFLA_PROMISCUITY
+ IFLA_NUM_TX_QUEUES,
+ IFLA_NUM_RX_QUEUES,
+ IFLA_CARRIER,
+ IFLA_PHYS_PORT_ID,
+ IFLA_CARRIER_CHANGES,
+ IFLA_PHYS_SWITCH_ID,
+ IFLA_LINK_NETNSID,
+ IFLA_PHYS_PORT_NAME,
+ IFLA_PROTO_DOWN,
+ IFLA_GSO_MAX_SEGS,
+ IFLA_GSO_MAX_SIZE,
+ IFLA_PAD,
+ IFLA_XDP,
+ IFLA_EVENT,
+ IFLA_NEW_NETNSID,
+ IFLA_IF_NETNSID,
+ IFLA_TARGET_NETNSID = IFLA_IF_NETNSID, /* new alias */
+ IFLA_CARRIER_UP_COUNT,
+ IFLA_CARRIER_DOWN_COUNT,
+ IFLA_NEW_IFINDEX,
+ IFLA_MIN_MTU,
+ IFLA_MAX_MTU,
+ IFLA_PROP_LIST,
+ IFLA_ALT_IFNAME, /* Alternative ifname */
+ IFLA_PERM_ADDRESS,
+ IFLA_PROTO_DOWN_REASON,
+ __IFLA_MAX
+};
+#define IFLA_MAX (__IFLA_MAX - 1)
+
+/*
+ * Attributes that can be used as filters:
+ * IFLA_IFNAME, IFLA_GROUP, IFLA_ALT_IFNAME
+ * Headers that can be used as filters:
+ * ifi_index, ifi_type
+ */
+
+/*
+ * IFLA_OPERSTATE.
+ * The values below represent the possible
+ * states of ifOperStatus defined by RFC 2863
+ */
+enum {
+ IF_OPER_UNKNOWN = 0, /* status can not be determined */
+ IF_OPER_NOTPRESENT = 1, /* some (hardware) component not present */
+ IF_OPER_DOWN = 2, /* down */
+ IF_OPER_LOWERLAYERDOWN = 3, /* some lower-level interface is down */
+ IF_OPER_TESTING = 4, /* in some test mode */
+ IF_OPER_DORMANT = 5, /* "up" but waiting for some condition (802.1X) */
+ IF_OPER_UP = 6, /* ready to pass packets */
+};
+
+/* IFLA_STATS */
+struct rtnl_link_stats {
+ uint32_t rx_packets; /* total RX packets (IFCOUNTER_IPACKETS) */
+ uint32_t tx_packets; /* total TX packets (IFCOUNTER_OPACKETS) */
+ uint32_t rx_bytes; /* total RX bytes (IFCOUNTER_IBYTES) */
+ uint32_t tx_bytes; /* total TX bytes (IFCOUNTER_OBYTES) */
+ uint32_t rx_errors; /* RX errors (IFCOUNTER_IERRORS) */
+ uint32_t tx_errors; /* RX errors (IFCOUNTER_OERRORS) */
+ uint32_t rx_dropped; /* RX drop (no space in ring/no bufs) (IFCOUNTER_IQDROPS) */
+ uint32_t tx_dropped; /* TX drop (IFCOUNTER_OQDROPS) */
+ uint32_t multicast; /* RX multicast packets (IFCOUNTER_IMCASTS) */
+ uint32_t collisions; /* not supported */
+ uint32_t rx_length_errors; /* not supported */
+ uint32_t rx_over_errors; /* not supported */
+ uint32_t rx_crc_errors; /* not supported */
+ uint32_t rx_frame_errors; /* not supported */
+ uint32_t rx_fifo_errors; /* not supported */
+ uint32_t rx_missed_errors; /* not supported */
+ uint32_t tx_aborted_errors; /* not supported */
+ uint32_t tx_carrier_errors; /* not supported */
+ uint32_t tx_fifo_errors; /* not supported */
+ uint32_t tx_heartbeat_errors; /* not supported */
+ uint32_t tx_window_errors; /* not supported */
+ uint32_t rx_compressed; /* not supported */
+ uint32_t tx_compressed; /* not supported */
+ uint32_t rx_nohandler; /* dropped due to no proto handler (IFCOUNTER_NOPROTO) */
+};
+
+/* IFLA_STATS64 */
+struct rtnl_link_stats64 {
+ uint64_t rx_packets; /* total RX packets (IFCOUNTER_IPACKETS) */
+ uint64_t tx_packets; /* total TX packets (IFCOUNTER_OPACKETS) */
+ uint64_t rx_bytes; /* total RX bytes (IFCOUNTER_IBYTES) */
+ uint64_t tx_bytes; /* total TX bytes (IFCOUNTER_OBYTES) */
+ uint64_t rx_errors; /* RX errors (IFCOUNTER_IERRORS) */
+ uint64_t tx_errors; /* RX errors (IFCOUNTER_OERRORS) */
+ uint64_t rx_dropped; /* RX drop (no space in ring/no bufs) (IFCOUNTER_IQDROPS) */
+ uint64_t tx_dropped; /* TX drop (IFCOUNTER_OQDROPS) */
+ uint64_t multicast; /* RX multicast packets (IFCOUNTER_IMCASTS) */
+ uint64_t collisions; /* not supported */
+ uint64_t rx_length_errors; /* not supported */
+ uint64_t rx_over_errors; /* not supported */
+ uint64_t rx_crc_errors; /* not supported */
+ uint64_t rx_frame_errors; /* not supported */
+ uint64_t rx_fifo_errors; /* not supported */
+ uint64_t rx_missed_errors; /* not supported */
+ uint64_t tx_aborted_errors; /* not supported */
+ uint64_t tx_carrier_errors; /* not supported */
+ uint64_t tx_fifo_errors; /* not supported */
+ uint64_t tx_heartbeat_errors; /* not supported */
+ uint64_t tx_window_errors; /* not supported */
+ uint64_t rx_compressed; /* not supported */
+ uint64_t tx_compressed; /* not supported */
+ uint64_t rx_nohandler; /* dropped due to no proto handler (IFCOUNTER_NOPROTO) */
+};
+
+/* IFLA_LINKINFO child nlattr types */
+enum {
+ IFLA_INFO_UNSPEC,
+ IFLA_INFO_KIND = 1, /* string, link type ("vlan") */
+ IFLA_INFO_DATA = 2, /* Per-link-type custom data */
+ IFLA_INFO_XSTATS = 3,
+ IFLA_INFO_SLAVE_KIND = 4,
+ IFLA_INFO_SLAVE_DATA = 5,
+ __IFLA_INFO_MAX,
+};
+#define IFLA_INFO_MAX (__IFLA_INFO_MAX - 1)
+
+/* IFLA_INFO_DATA vlan attributes */
+enum {
+ IFLA_VLAN_UNSPEC,
+ IFLA_VLAN_ID,
+ IFLA_VLAN_FLAGS,
+ IFLA_VLAN_EGRESS_QOS,
+ IFLA_VLAN_INGRESS_QOS,
+ IFLA_VLAN_PROTOCOL,
+ __IFLA_VLAN_MAX,
+};
+
+#define IFLA_VLAN_MAX (__IFLA_VLAN_MAX - 1)
+struct ifla_vlan_flags {
+ uint32_t flags;
+ uint32_t mask;
+};
+
+#endif
diff --git a/sys/netlink/route/neigh.h b/sys/netlink/route/neigh.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/neigh.h
@@ -0,0 +1,105 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Neighbors-related (RTM_<NEW|DEL|GET>NEIGH) message header and attributes.
+ */
+
+#ifndef _NETLINK_ROUTE_NEIGH_H_
+#define _NETLINK_ROUTE_NEIGH_H_
+
+/* Base header for all of the relevant messages */
+struct ndmsg {
+ uint8_t ndm_family;
+ uint8_t ndm_pad1;
+ uint16_t ndm_pad2;
+ int32_t ndm_ifindex;
+ uint16_t ndm_state;
+ uint8_t ndm_flags;
+ uint8_t ndm_type;
+};
+
+/* Attributes */
+enum {
+ NDA_UNSPEC,
+ NDA_DST, /* binary: neigh l3 address */
+ NDA_LLADDR, /* binary: neigh link-level address */
+ NDA_CACHEINFO, /* binary, struct nda_cacheinfo */
+ NDA_PROBES, /* XXX */
+ NDA_VLAN, /* upper 802.1Q tag */
+ NDA_PORT, /* not supported */
+ NDA_VNI, /* not supported */
+ NDA_IFINDEX, /* interface index */
+ NDA_MASTER, /* not supported */
+ NDA_LINK_NETNSID, /* not supported */
+ NDA_SRC_VNI, /* not supported */
+ NDA_PROTOCOL, /* XXX */
+ NDA_NH_ID, /* not supported */
+ NDA_FDB_EXT_ATTRS, /* not supported */
+ NDA_FLAGS_EXT, /* u32: ndm_flags */
+ NDA_NDM_STATE_MASK, /* XXX */
+ NDA_NDM_FLAGS_MASK, /* XXX */
+ __NDA_MAX
+};
+
+#define NDA_MAX (__NDA_MAX - 1)
+
+
+/* ndm_flags / NDA_FLAGS_EXT */
+#define NTF_USE 0x0001 /* XXX */
+#define NTF_SELF 0x0002 /* local station */
+#define NTF_MASTER 0x0004 /* XXX */
+#define NTF_PROXY 0x0008 /* proxy entry */
+#define NTF_EXT_LEARNED 0x0010 /* not used */
+#define NTF_OFFLOADED 0x0020 /* not used */
+#define NTF_STICKY 0x0040 /* permament entry */
+#define NTF_ROUTER 0x0080 /* dst indicated itself as a router */
+/* start of NDA_FLAGS_EXT */
+#define NTF_EXT_MANAGED 0x0100 /* not used */
+
+/* ndm_state */
+#define NUD_INCOMPLETE 0x01 /* No lladdr, address resolution in progress */
+#define NUD_REACHABLE 0x02 /* reachable & recently resolved */
+#define NUD_STALE 0x04 /* has lladdr but it's stale */
+#define NUD_DELAY 0x08 /* has lladdr, is stale, probes delayed */
+#define NUD_PROBE 0x10 /* has lladdr, is stale, probes sent */
+#define NUD_FAILED 0x20 /* unused */
+
+/* Dummy states */
+#define NUD_NOARP 0x40 /* not used */
+#define NUD_PERMANENT 0x80 /* not flushed */
+#define NUD_NONE 0x00
+
+/* NDA_CACHEINFO */
+struct nda_cacheinfo {
+ uint32_t ndm_confirmed; /* seconds since ARP/ND was received from neigh */
+ uint32_t ndm_used; /* seconds since last used (not provided) */
+ uint32_t ndm_updated; /* seconds since state was updated last */
+ uint32_t ndm_refcnt; /* number of references held */
+};
+
+#endif
diff --git a/sys/netlink/route/neigh.c b/sys/netlink/route/neigh.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/neigh.c
@@ -0,0 +1,571 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include "opt_inet.h"
+#include "opt_inet6.h"
+#include <sys/types.h>
+#include <sys/malloc.h>
+#include <sys/socket.h>
+#include <sys/syslog.h>
+
+#include <net/if.h>
+#include <net/if_llatbl.h>
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_route.h>
+#include <netlink/route/route_var.h>
+
+#include <netinet6/in6_var.h> /* nd6.h requires this */
+#include <netinet6/nd6.h> /* nd6 state machine */
+#include <netinet6/scope6_var.h> /* scope deembedding */
+
+#define DEBUG_MOD_NAME nl_neigh
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG);
+
+static int lle_families[] = { AF_INET, AF_INET6 };
+
+static eventhandler_tag lle_event_p;
+
+struct netlink_walkargs {
+ struct nl_writer *nw;
+ struct nlmsghdr hdr;
+ struct nlpcb *so;
+ struct ifnet *ifp;
+ int family;
+ int error;
+ int count;
+ int dumped;
+};
+
+static int
+lle_state_to_nl_state(int family, struct llentry *lle)
+{
+ int state = lle->ln_state;
+
+ switch (family) {
+ case AF_INET:
+ if (lle->la_flags & (LLE_STATIC | LLE_IFADDR))
+ state = 1;
+ switch (state) {
+ case 0: /* ARP_LLINFO_INCOMPLETE */
+ return (NUD_INCOMPLETE);
+ case 1: /* ARP_LLINFO_REACHABLE */
+ return (NUD_REACHABLE);
+ case 2: /* ARP_LLINFO_VERIFY */
+ return (NUD_PROBE);
+ }
+ break;
+ case AF_INET6:
+ switch (state) {
+ case ND6_LLINFO_INCOMPLETE:
+ return (NUD_INCOMPLETE);
+ case ND6_LLINFO_REACHABLE:
+ return (NUD_REACHABLE);
+ case ND6_LLINFO_STALE:
+ return (NUD_STALE);
+ case ND6_LLINFO_DELAY:
+ return (NUD_DELAY);
+ case ND6_LLINFO_PROBE:
+ return (NUD_PROBE);
+ }
+ break;
+ }
+
+ return (NUD_NONE);
+}
+
+static uint32_t
+lle_flags_to_nl_flags(const struct llentry *lle)
+{
+ uint32_t nl_flags = 0;
+
+ if (lle->la_flags & LLE_IFADDR)
+ nl_flags |= NTF_SELF;
+ if (lle->la_flags & LLE_PUB)
+ nl_flags |= NTF_PROXY;
+ if (lle->la_flags & LLE_STATIC)
+ nl_flags |= NTF_STICKY;
+ if (lle->ln_router != 0)
+ nl_flags |= NTF_ROUTER;
+
+ return (nl_flags);
+}
+
+static int
+dump_lle_locked(struct llentry *lle, void *arg)
+{
+ struct netlink_walkargs *wa = (struct netlink_walkargs *)arg;
+ struct nlmsghdr *hdr = &wa->hdr;
+ struct nl_writer *nw = wa->nw;
+ struct ndmsg *ndm;
+ union {
+ struct in_addr in;
+ struct in6_addr in6;
+ } addr;
+
+ IF_DEBUG_LEVEL(LOG_DEBUG2) {
+ char llebuf[NHOP_PRINT_BUFSIZE];
+ llentry_print_buf_lltable(lle, llebuf, sizeof(llebuf));
+ NL_LOG(LOG_DEBUG2, "dumping %s", llebuf);
+ }
+
+ if (!nlmsg_reply(nw, hdr, sizeof(struct ndmsg)))
+ goto enomem;
+
+ ndm = nlmsg_reserve_object(nw, struct ndmsg);
+ ndm->ndm_family = wa->family;
+ ndm->ndm_ifindex = wa->ifp->if_index;
+ ndm->ndm_state = lle_state_to_nl_state(wa->family, lle);
+ ndm->ndm_flags = lle_flags_to_nl_flags(lle);
+
+ switch (wa->family) {
+#ifdef INET
+ case AF_INET:
+ addr.in = lle->r_l3addr.addr4;
+ nlattr_add(nw, NDA_DST, 4, &addr);
+ break;
+#endif
+#ifdef INET6
+ case AF_INET6:
+ addr.in6 = lle->r_l3addr.addr6;
+ in6_clearscope(&addr.in6);
+ nlattr_add(nw, NDA_DST, 16, &addr);
+ break;
+#endif
+ }
+
+ if (lle->r_flags & RLLE_VALID) {
+ /* Has L2 */
+ int addrlen = wa->ifp->if_addrlen;
+ nlattr_add(nw, NDA_LLADDR, addrlen, lle->ll_addr);
+ }
+
+ nlattr_add_u32(nw, NDA_PROBES, lle->la_asked);
+
+ struct nda_cacheinfo *cache;
+ cache = nlmsg_reserve_attr(nw, NDA_CACHEINFO, struct nda_cacheinfo);
+ if (cache == NULL)
+ goto enomem;
+ /* TODO: provide confirmed/updated */
+ cache->ndm_refcnt = lle->lle_refcnt;
+
+ if (nlmsg_end(nw))
+ return (0);
+enomem:
+ NL_LOG(LOG_DEBUG, "unable to dump lle state (ENOMEM)");
+ nlmsg_abort(nw);
+ return (ENOMEM);
+}
+
+static int
+dump_lle(struct lltable *llt, struct llentry *lle, void *arg)
+{
+ int error;
+
+ LLE_RLOCK(lle);
+ error = dump_lle_locked(lle, arg);
+ LLE_RUNLOCK(lle);
+ return (error);
+}
+
+static bool
+dump_llt(struct lltable *llt, struct netlink_walkargs *wa)
+{
+ lltable_foreach_lle(llt, dump_lle, wa);
+
+ return (true);
+}
+
+static int
+dump_llts_iface(struct netlink_walkargs *wa, struct ifnet *ifp, int family)
+{
+ int error = 0;
+
+ wa->ifp = ifp;
+ for (int i = 0; i < sizeof(lle_families) / sizeof(int); i++) {
+ int fam = lle_families[i];
+ struct lltable *llt = lltable_get(ifp, fam);
+ if (llt != NULL && (family == 0 || family == fam)) {
+ wa->count++;
+ wa->family = fam;
+ if (!dump_llt(llt, wa)) {
+ error = ENOMEM;
+ break;
+ }
+ wa->dumped++;
+ }
+ }
+ return (error);
+}
+
+static int
+dump_llts(struct netlink_walkargs *wa, struct ifnet *ifp, int family)
+{
+ NL_LOG(LOG_DEBUG, "Start dump ifp=%s family=%d", ifp ? if_name(ifp) : "NULL", family);
+
+ wa->hdr.nlmsg_flags |= NLM_F_MULTI;
+
+ if (ifp != NULL) {
+ dump_llts_iface(wa, ifp, family);
+ } else {
+ CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
+ dump_llts_iface(wa, ifp, family);
+ }
+ }
+
+ NL_LOG(LOG_DEBUG, "End dump, iterated %d dumped %d", wa->count, wa->dumped);
+
+ if (!nlmsg_end_dump(wa->nw, wa->error, &wa->hdr)) {
+ NL_LOG(LOG_DEBUG, "Unable to add new message");
+ return (ENOMEM);
+ }
+
+ return (0);
+}
+
+static int
+get_lle(struct netlink_walkargs *wa, struct ifnet *ifp, int family, struct sockaddr *dst)
+{
+ struct lltable *llt = lltable_get(ifp, family);
+ if (llt == NULL)
+ return (ESRCH);
+
+#ifdef INET6
+ if (dst->sa_family == AF_INET6) {
+ struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
+
+ if (IN6_IS_SCOPE_LINKLOCAL(&dst6->sin6_addr))
+ in6_set_unicast_scopeid(&dst6->sin6_addr, ifp->if_index);
+ }
+#endif
+ struct llentry *lle = lla_lookup(llt, LLE_UNLOCKED, dst);
+ if (lle == NULL)
+ return (ESRCH);
+
+ wa->ifp = ifp;
+ wa->family = family;
+
+ return (dump_lle(llt, lle, wa));
+}
+
+struct nl_parsed_neigh {
+ struct sockaddr *nda_dst;
+ struct ifnet *nda_ifp;
+ struct nlattr *nda_lladdr;
+ uint32_t ndm_flags;
+ uint16_t ndm_state;
+ uint8_t ndm_family;
+};
+
+#define _IN(_field) offsetof(struct ndmsg, _field)
+#define _OUT(_field) offsetof(struct nl_parsed_neigh, _field)
+static struct nlfield_parser nlf_p_neigh[] = {
+ { .off_in = _IN(ndm_family), .off_out = _OUT(ndm_family), .cb = nlf_get_u8 },
+ { .off_in = _IN(ndm_flags), .off_out = _OUT(ndm_flags), .cb = nlf_get_u8_u32 },
+ { .off_in = _IN(ndm_state), .off_out = _OUT(ndm_state), .cb = nlf_get_u16 },
+ { .off_in = _IN(ndm_ifindex), .off_out = _OUT(nda_ifp), .cb = nlf_get_ifpz },
+};
+
+static struct nlattr_parser nla_p_neigh[] = {
+ { .type = NDA_DST, .off = _OUT(nda_dst), .cb = nlattr_get_ip },
+ { .type = NDA_LLADDR, .off = _OUT(nda_lladdr), .cb = nlattr_get_nla },
+ { .type = NDA_IFINDEX, .off = _OUT(nda_ifp), .cb = nlattr_get_ifp },
+ { .type = NDA_FLAGS_EXT, .off = _OUT(ndm_flags), .cb = nlattr_get_uint32 },
+};
+#undef _IN
+#undef _OUT
+NL_DECLARE_PARSER(ndmsg_parser, struct ndmsg, nlf_p_neigh, nla_p_neigh);
+
+
+/*
+ * type=RTM_NEWNEIGH, flags=NLM_F_REQUEST|NLM_F_ACK|NLM_F_EXCL|NLM_F_CREATE, seq=1661941473, pid=0},
+ * {ndm_family=AF_INET6, ndm_ifindex=if_nametoindex("enp0s31f6"), ndm_state=NUD_PERMANENT, ndm_flags=0, ndm_type=RTN_UNSPEC},
+ * [
+ * {{nla_len=20, nla_type=NDA_DST}, inet_pton(AF_INET6, "2a01:4f8:13a:70c::3")},
+ * {{nla_len=10, nla_type=NDA_LLADDR}, 20:4e:71:62:ae:f2}]}, iov_len=60}
+ */
+
+static int
+rtnl_handle_newneigh(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt)
+{
+ int error;
+
+ struct nl_parsed_neigh attrs = {};
+ error = nl_parse_nlmsg(hdr, &ndmsg_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ if (attrs.nda_ifp == NULL || attrs.nda_dst == NULL || attrs.nda_lladdr == NULL) {
+ if (attrs.nda_ifp == NULL)
+ NLMSG_REPORT_ERR_MSG(npt, "NDA_IFINDEX / ndm_ifindex not set");
+ if (attrs.nda_dst == NULL)
+ NLMSG_REPORT_ERR_MSG(npt, "NDA_DST not set");
+ if (attrs.nda_lladdr == NULL)
+ NLMSG_REPORT_ERR_MSG(npt, "NDA_LLADDR not set");
+ return (EINVAL);
+ }
+
+ if (attrs.nda_dst->sa_family != attrs.ndm_family) {
+ NLMSG_REPORT_ERR_MSG(npt,
+ "NDA_DST family (%d) is different from ndm_family (%d)",
+ attrs.nda_dst->sa_family, attrs.ndm_family);
+ return (EINVAL);
+ }
+
+ int addrlen = attrs.nda_ifp->if_addrlen;
+ if (attrs.nda_lladdr->nla_len != sizeof(struct nlattr) + addrlen) {
+ NLMSG_REPORT_ERR_MSG(npt,
+ "NDA_LLADDR address length (%ld) is different from expected (%d)",
+ attrs.nda_lladdr->nla_len - sizeof(struct nlattr), addrlen);
+ return (EINVAL);
+ }
+
+ if (attrs.ndm_state != NUD_PERMANENT) {
+ NLMSG_REPORT_ERR_MSG(npt, "ndm_state %d not supported", attrs.ndm_state);
+ return (ENOTSUP);
+ }
+
+ const uint16_t supported_flags = NTF_PROXY | NTF_STICKY;
+ if ((attrs.ndm_flags & supported_flags) != attrs.ndm_flags) {
+ NLMSG_REPORT_ERR_MSG(npt, "ndm_flags %X not supported",
+ attrs.ndm_flags &~ supported_flags);
+ return (ENOTSUP);
+ }
+
+ /* Replacement requires new entry creation anyway */
+ if ((hdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_REPLACE)) == 0)
+ return (ENOTSUP);
+
+ struct lltable *llt = lltable_get(attrs.nda_ifp, attrs.ndm_family);
+ if (llt == NULL)
+ return (EAFNOSUPPORT);
+
+
+ uint8_t linkhdr[LLE_MAX_LINKHDR];
+ size_t linkhdrsize = sizeof(linkhdr);
+ int lladdr_off = 0;
+ if (lltable_calc_llheader(attrs.nda_ifp, attrs.ndm_family,
+ (char *)(attrs.nda_lladdr + 1), linkhdr, &linkhdrsize, &lladdr_off) != 0) {
+ NLMSG_REPORT_ERR_MSG(npt, "unable to calculate lle prepend data");
+ return (EINVAL);
+ }
+
+ int lle_flags = LLE_STATIC | ((attrs.ndm_flags & NTF_PROXY) ? LLE_PUB : 0);
+ struct llentry *lle = lltable_alloc_entry(llt, lle_flags, attrs.nda_dst);
+ if (lle == NULL)
+ return (ENOMEM);
+ lltable_set_entry_addr(attrs.nda_ifp, lle, linkhdr, linkhdrsize, lladdr_off);
+
+ /* llentry created, try to insert or update :*/
+ IF_AFDATA_WLOCK(attrs.nda_ifp);
+ LLE_WLOCK(lle);
+ struct llentry *lle_tmp = lla_lookup(llt, LLE_EXCLUSIVE, attrs.nda_dst);
+ if (lle_tmp != NULL) {
+ if (hdr->nlmsg_flags & NLM_F_EXCL) {
+ LLE_WUNLOCK(lle_tmp);
+ lle_tmp = NULL;
+ error = EEXIST;
+ } else if (hdr->nlmsg_flags & NLM_F_REPLACE) {
+ lltable_unlink_entry(llt, lle_tmp);
+ lltable_link_entry(llt, lle);
+ } else
+ error = EEXIST;
+ } else {
+ if (hdr->nlmsg_flags & NLM_F_CREATE)
+ lltable_link_entry(llt, lle);
+ else
+ error = ENOENT;
+ }
+ IF_AFDATA_WUNLOCK(attrs.nda_ifp);
+
+ if (error != 0) {
+ if (lle != NULL)
+ llentry_free(lle);
+ return (error);
+ }
+
+ if (lle_tmp != NULL)
+ llentry_free(lle_tmp);
+
+ /* XXX: We're inside epoch */
+ EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_RESOLVED);
+ LLE_WUNLOCK(lle);
+
+ return (0);
+}
+
+static int
+rtnl_handle_delneigh(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt)
+{
+ int error;
+
+ struct nl_parsed_neigh attrs = {};
+ error = nl_parse_nlmsg(hdr, &ndmsg_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ if (attrs.nda_dst == NULL) {
+ NLMSG_REPORT_ERR_MSG(npt, "NDA_DST not set");
+ return (EINVAL);
+ }
+
+ if (attrs.nda_ifp == NULL) {
+ NLMSG_REPORT_ERR_MSG(npt, "no ifindex provided");
+ return (EINVAL);
+ }
+
+ struct lltable *llt = lltable_get(attrs.nda_ifp, attrs.ndm_family);
+ if (llt == NULL)
+ return (EAFNOSUPPORT);
+
+ IF_AFDATA_WLOCK(attrs.nda_ifp);
+ struct llentry *lle = lla_lookup(llt, LLE_EXCLUSIVE, attrs.nda_dst);
+ if (lle != NULL) {
+ if ((lle->la_flags & LLE_IFADDR) != 0) {
+ LLE_WUNLOCK(lle);
+ lle = NULL;
+ error = EPERM;
+ } else
+ lltable_unlink_entry(llt, lle);
+ } else
+ error = ENOENT;
+ IF_AFDATA_WUNLOCK(attrs.nda_ifp);
+
+ if (error == 0 && lle != NULL)
+ EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
+
+ if (lle != NULL)
+ llentry_free(lle);
+
+ return (error);
+}
+
+static int
+rtnl_handle_getneigh(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt)
+{
+ int error;
+
+ struct nl_parsed_neigh attrs = {};
+ error = nl_parse_nlmsg(hdr, &ndmsg_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ if (attrs.nda_dst != NULL && attrs.nda_ifp == NULL) {
+ NLMSG_REPORT_ERR_MSG(npt, "has NDA_DST but no ifindex provided");
+ return (EINVAL);
+ }
+
+ struct netlink_walkargs wa = {
+ .so = nlp,
+ .nw = npt->nw,
+ .hdr.nlmsg_pid = hdr->nlmsg_pid,
+ .hdr.nlmsg_seq = hdr->nlmsg_seq,
+ .hdr.nlmsg_flags = hdr->nlmsg_flags,
+ .hdr.nlmsg_type = NL_RTM_NEWNEIGH,
+ };
+
+ if (attrs.nda_dst == NULL)
+ error = dump_llts(&wa, attrs.nda_ifp, attrs.ndm_family);
+ else
+ error = get_lle(&wa, attrs.nda_ifp, attrs.ndm_family, attrs.nda_dst);
+
+ return (error);
+}
+
+static const struct rtnl_cmd_handler cmd_handlers[] = {
+ {
+ .cmd = NL_RTM_NEWNEIGH,
+ .name = "RTM_NEWNEIGH",
+ .cb = &rtnl_handle_newneigh,
+ },
+ {
+ .cmd = NL_RTM_DELNEIGH,
+ .name = "RTM_DELNEIGH",
+ .cb = &rtnl_handle_delneigh,
+ .priv = PRIV_NET_ROUTE,
+ },
+ {
+ .cmd = NL_RTM_GETNEIGH,
+ .name = "RTM_GETNEIGH",
+ .cb = &rtnl_handle_getneigh,
+ .priv = PRIV_NET_ROUTE,
+ }
+};
+
+static void
+rtnl_lle_event(void *arg __unused, struct llentry *lle, int evt)
+{
+ struct ifnet *ifp;
+ int family;
+
+ LLE_WLOCK_ASSERT(lle);
+
+ ifp = lltable_get_ifp(lle->lle_tbl);
+ family = lltable_get_af(lle->lle_tbl);
+
+ if (family != AF_INET && family != AF_INET6)
+ return;
+
+ int nlmsgs_type = evt == LLENTRY_RESOLVED ? NL_RTM_NEWNEIGH : NL_RTM_DELNEIGH;
+
+ struct nl_writer nw = {};
+ if (!nlmsg_get_group_writer(&nw, NLMSG_SMALL, NETLINK_ROUTE, RTNLGRP_NEIGH)) {
+ NL_LOG(LOG_DEBUG, "error allocating group writer");
+ return;
+ }
+
+ struct netlink_walkargs wa = {
+ .hdr.nlmsg_type = nlmsgs_type,
+ .nw = &nw,
+ .ifp = ifp,
+ .family = family,
+ };
+
+ dump_lle_locked(lle, &wa);
+ nlmsg_flush(&nw);
+}
+
+static const struct nlhdr_parser *all_parsers[] = { &ndmsg_parser };
+
+void
+rtnl_neighs_init()
+{
+ NL_VERIFY_PARSERS(all_parsers);
+ rtnl_register_messages(cmd_handlers, NL_ARRAY_LEN(cmd_handlers));
+ lle_event_p = EVENTHANDLER_REGISTER(lle_event, rtnl_lle_event, NULL,
+ EVENTHANDLER_PRI_ANY);
+}
+
+void
+rtnl_neighs_destroy()
+{
+ EVENTHANDLER_DEREGISTER(lle_event, lle_event_p);
+}
diff --git a/sys/netlink/route/nexthop.h b/sys/netlink/route/nexthop.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/nexthop.h
@@ -0,0 +1,102 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * NEXTHOP-related (RTM_<NEW|DEL|GET>NEXTHOP) message header and attributes.
+ */
+
+#ifndef _NETLINK_ROUTE_NEXTHOP_H_
+#define _NETLINK_ROUTE_NEXTHOP_H_
+
+/* Base header for all of the relevant messages */
+struct nhmsg {
+ unsigned char nh_family; /* transport family */
+ unsigned char nh_scope; /* ignored on RX, filled by kernel */
+ unsigned char nh_protocol; /* Routing protocol that installed nh */
+ unsigned char resvd;
+ unsigned int nh_flags; /* RTNH_F_* flags from route.h */
+};
+
+enum {
+ NHA_UNSPEC,
+ NHA_ID, /* u32: nexthop userland index, auto-assigned if 0 */
+ NHA_GROUP, /* binary: array of struct nexthop_grp */
+ NHA_GROUP_TYPE, /* u16: set to NEXTHOP_GRP_TYPE */
+ NHA_BLACKHOLE, /* flag: nexthop used to blackhole packets */
+ NHA_OIF, /* u32: transmit ifindex */
+ NHA_GATEWAY, /* network: IPv4/IPv6 gateway addr */
+ NHA_ENCAP_TYPE, /* not supported */
+ NHA_ENCAP, /* not supported */
+ NHA_GROUPS, /* flag: match nexthop groups */
+ NHA_MASTER, /* not supported */
+ NHA_FDB, /* not supported */
+ NHA_RES_GROUP, /* not supported */
+ NHA_RES_BUCKET, /* not supported */
+ __NHA_MAX,
+};
+#define NHA_MAX (__NHA_MAX - 1)
+
+/*
+ * Attributes that can be used as filters:
+ * NHA_ID (nexhop or group), NHA_OIF, NHA_GROUPS,
+ */
+
+/*
+ * NHA_GROUP: array of the following structures.
+ * If attribute is set, the only other valid attributes are
+ * NHA_ID and NHA_GROUP_TYPE.
+ * NHA_RES_GROUP and NHA_RES_BUCKET are not supported yet
+ */
+struct nexthop_grp {
+ uint32_t id; /* nexhop userland index */
+ uint8_t weight; /* weight of this nexthop */
+ uint8_t resvd1;
+ uint16_t resvd2;
+};
+
+/* NHA_GROUP_TYPE: u16 */
+enum {
+ NEXTHOP_GRP_TYPE_MPATH, /* default nexthop group */
+ NEXTHOP_GRP_TYPE_RES, /* resilient nexthop group */
+ __NEXTHOP_GRP_TYPE_MAX,
+};
+#define NEXTHOP_GRP_TYPE_MAX (__NEXTHOP_GRP_TYPE_MAX - 1)
+
+
+/* NHA_RES_GROUP */
+enum {
+ NHA_RES_GROUP_UNSPEC,
+ NHA_RES_GROUP_PAD = NHA_RES_GROUP_UNSPEC,
+ NHA_RES_GROUP_BUCKETS,
+ NHA_RES_GROUP_IDLE_TIMER,
+ NHA_RES_GROUP_UNBALANCED_TIMER,
+ NHA_RES_GROUP_UNBALANCED_TIME,
+ __NHA_RES_GROUP_MAX,
+};
+#define NHA_RES_GROUP_MAX (__NHA_RES_GROUP_MAX - 1)
+
+#endif
diff --git a/sys/netlink/route/nexthop.c b/sys/netlink/route/nexthop.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/nexthop.c
@@ -0,0 +1,1000 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include "opt_inet.h"
+#include "opt_inet6.h"
+#include <sys/types.h>
+#include <sys/malloc.h>
+#include <sys/rmlock.h>
+#include <sys/socket.h>
+#include <sys/ck.h>
+
+#include <net/if.h>
+#include <net/route.h>
+#include <net/route/nhop.h>
+#include <net/route/nhop_utils.h>
+
+#include <net/route/route_ctl.h>
+#include <net/route/route_var.h>
+#include <netinet6/scope6_var.h>
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_var.h>
+#include <netlink/netlink_route.h>
+#include <netlink/route/route_var.h>
+
+#define DEBUG_MOD_NAME nl_nhop
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG3);
+
+/*
+ * This file contains the logic to maintain kernel nexthops and
+ * nexhop groups based om the data provided by the user.
+ *
+ * Kernel stores (nearly) all of the routing data in the nexthops,
+ * including the prefix-specific flags (NHF_HOST and NHF_DEFAULT).
+ *
+ * Netlink API provides higher-level abstraction for the user. Each
+ * user-created nexthop may map to multiple kernel nexthops.
+ *
+ * The following variations require separate kernel nexthop to be
+ * created:
+ * * prefix flags (NHF_HOST, NHF_DEFAULT)
+ * * using IPv6 gateway for IPv4 routes
+ * * different fibnum
+ *
+ * These kernel nexthops have the lifetime bound to the lifetime of
+ * the user_nhop object. They are not collected until user requests
+ * to delete the created user_nhop.
+ *
+ */
+struct user_nhop {
+ uint32_t un_idx; /* Userland-provided index */
+ uint32_t un_fibfam; /* fibnum+af(as highest byte) */
+ uint8_t un_protocol; /* protocol that install the record */
+ struct nhop_object *un_nhop; /* "production" nexthop */
+ struct nhop_object *un_nhop_src; /* nexthop to copy from */
+ struct weightened_nhop *un_nhgrp_src; /* nexthops for nhg */
+ uint32_t un_nhgrp_count; /* number of nexthops */
+ struct user_nhop *un_next; /* next item in hash chain */
+ struct user_nhop *un_nextchild; /* master -> children */
+ struct epoch_context un_epoch_ctx; /* epoch ctl helper */
+};
+
+/* produce hash value for an object */
+#define unhop_hash_obj(_obj) (hash_unhop(_obj))
+/* compare two objects */
+#define unhop_cmp(_one, _two) (cmp_unhop(_one, _two))
+/* next object accessor */
+#define unhop_next(_obj) (_obj)->un_next
+
+CHT_SLIST_DEFINE(unhop, struct user_nhop);
+
+struct unhop_ctl {
+ struct unhop_head un_head;
+ struct rmlock un_lock;
+};
+#define UN_LOCK_INIT(_ctl) rm_init(&(_ctl)->un_lock, "unhop_ctl")
+#define UN_TRACKER struct rm_priotracker un_tracker
+#define UN_RLOCK(_ctl) rm_rlock(&((_ctl)->un_lock), &un_tracker)
+#define UN_RUNLOCK(_ctl) rm_runlock(&((_ctl)->un_lock), &un_tracker)
+
+#define UN_WLOCK(_ctl) rm_wlock(&(_ctl)->un_lock);
+#define UN_WUNLOCK(_ctl) rm_wunlock(&(_ctl)->un_lock);
+
+VNET_DEFINE_STATIC(struct unhop_ctl *, un_ctl) = NULL;
+#define V_un_ctl VNET(un_ctl)
+
+static void consider_resize(struct unhop_ctl *ctl, uint32_t new_size);
+static int cmp_unhop(const struct user_nhop *a, const struct user_nhop *b);
+static unsigned int hash_unhop(const struct user_nhop *obj);
+
+static void destroy_unhop(struct user_nhop *unhop);
+static struct nhop_object *clone_unhop(const struct user_nhop *unhop,
+ uint32_t fibnum, int family, int nh_flags);
+
+static int
+cmp_unhop(const struct user_nhop *a, const struct user_nhop *b)
+{
+ return (a->un_idx == b->un_idx && a->un_fibfam == b->un_fibfam);
+}
+
+/*
+ * Hash callback: calculate hash of an object
+ */
+static unsigned int
+hash_unhop(const struct user_nhop *obj)
+{
+ return (obj->un_idx ^ obj->un_fibfam);
+}
+
+#define UNHOP_IS_MASTER(_unhop) ((_unhop)->un_fibfam == 0)
+
+/*
+ * Factory interface for creating matching kernel nexthops/nexthop groups
+ *
+ * @uidx: userland nexhop index used to create the nexthop
+ * @fibnum: fibnum nexthop will be used in
+ * @family: upper family nexthop will be used in
+ * @nh_flags: desired nexthop prefix flags
+ * @perror: pointer to store error to
+ *
+ * Returns referenced nexthop linked to @fibnum/@family rib on success.
+ */
+struct nhop_object *
+nl_find_nhop(uint32_t fibnum, int family, uint32_t uidx,
+ int nh_flags, int *perror)
+{
+ struct unhop_ctl *ctl = atomic_load_ptr(&V_un_ctl);
+ UN_TRACKER;
+
+ if (__predict_false(ctl == NULL))
+ return (NULL);
+
+ struct user_nhop key= {
+ .un_idx = uidx,
+ .un_fibfam = fibnum | ((uint32_t)family) << 24,
+ };
+ struct user_nhop *unhop;
+
+ nh_flags = nh_flags & (NHF_HOST | NHF_DEFAULT);
+
+ if (__predict_false(family == 0))
+ return (NULL);
+
+ UN_RLOCK(ctl);
+ CHT_SLIST_FIND_BYOBJ(&ctl->un_head, unhop, &key, unhop);
+ if (unhop != NULL) {
+ struct nhop_object *nh = unhop->un_nhop;
+ UN_RLOCK(ctl);
+ *perror = 0;
+ nhop_ref_any(nh);
+ return (nh);
+ }
+
+ /*
+ * Exact nexthop not found. Search for template nexthop to clone from.
+ */
+ key.un_fibfam = 0;
+ CHT_SLIST_FIND_BYOBJ(&ctl->un_head, unhop, &key, unhop);
+ if (unhop == NULL) {
+ UN_RUNLOCK(ctl);
+ *perror = ESRCH;
+ return (NULL);
+ }
+
+ UN_RUNLOCK(ctl);
+
+ /* Create entry to insert first */
+ struct user_nhop *un_new, *un_tmp;
+ un_new = malloc(sizeof(struct user_nhop), M_NETLINK, M_NOWAIT | M_ZERO);
+ if (un_new == NULL) {
+ *perror = ENOMEM;
+ return (NULL);
+ }
+ un_new->un_idx = uidx;
+ un_new->un_fibfam = fibnum | ((uint32_t)family) << 24;
+
+ /* Relying on epoch to protect unhop here */
+ un_new->un_nhop = clone_unhop(unhop, fibnum, family, nh_flags);
+ if (un_new->un_nhop == NULL) {
+ free(un_new, M_NETLINK);
+ *perror = ENOMEM;
+ return (NULL);
+ }
+
+ /* Insert back and report */
+ UN_WLOCK(ctl);
+
+ /* First, find template record once again */
+ CHT_SLIST_FIND_BYOBJ(&ctl->un_head, unhop, &key, unhop);
+ if (unhop == NULL) {
+ /* Someone deleted the nexthop during the call */
+ UN_WUNLOCK(ctl);
+ *perror = ESRCH;
+ destroy_unhop(un_new);
+ return (NULL);
+ }
+
+ /* Second, check the direct match */
+ CHT_SLIST_FIND_BYOBJ(&ctl->un_head, unhop, un_new, un_tmp);
+ struct nhop_object *nh;
+ if (un_tmp != NULL) {
+ /* Another thread already created the desired nextop, use it */
+ nh = un_tmp->un_nhop;
+ } else {
+ /* Finally, insert the new nexthop and link it to the primary */
+ nh = un_new->un_nhop;
+ CHT_SLIST_INSERT_HEAD(&ctl->un_head, unhop, un_new);
+ un_new->un_nextchild = unhop->un_nextchild;
+ unhop->un_nextchild = un_new;
+ un_new = NULL;
+ NL_LOG(LOG_DEBUG2, "linked cloned nexthop %p", nh);
+ }
+
+ UN_WUNLOCK(ctl);
+
+ if (un_new != NULL)
+ destroy_unhop(un_new);
+
+ *perror = 0;
+ nhop_ref_any(nh);
+ return (nh);
+}
+
+static struct user_nhop *
+nl_find_base_unhop(struct unhop_ctl *ctl, uint32_t uidx)
+{
+ struct user_nhop key= { .un_idx = uidx };
+ struct user_nhop *unhop = NULL;
+ UN_TRACKER;
+
+ UN_RLOCK(ctl);
+ CHT_SLIST_FIND_BYOBJ(&ctl->un_head, unhop, &key, unhop);
+ UN_RUNLOCK(ctl);
+
+ return (unhop);
+}
+
+#define MAX_STACK_NHOPS 4
+static struct nhop_object *
+clone_unhop(const struct user_nhop *unhop, uint32_t fibnum, int family, int nh_flags)
+{
+ const struct weightened_nhop *wn;
+ struct weightened_nhop *wn_new, wn_base[MAX_STACK_NHOPS];
+ struct nhop_object *nh = NULL;
+ uint32_t num_nhops;
+ int error;
+
+ if (unhop->un_nhop_src != NULL) {
+ IF_DEBUG_LEVEL(LOG_DEBUG2) {
+ char nhbuf[NHOP_PRINT_BUFSIZE];
+ nhop_print_buf_any(unhop->un_nhop_src, nhbuf, sizeof(nhbuf));
+ FIB_NH_LOG(LOG_DEBUG2, unhop->un_nhop_src,
+ "cloning nhop %s -> %u.%u flags 0x%X", nhbuf, fibnum,
+ family, nh_flags);
+ }
+ struct nhop_object *nh;
+ nh = nhop_alloc(fibnum, AF_UNSPEC);
+ if (nh == NULL)
+ return (NULL);
+ nhop_copy(nh, unhop->un_nhop_src);
+ /* Check that nexthop gateway is compatible with the new family */
+ if (!nhop_set_upper_family(nh, family)) {
+ nhop_free(nh);
+ return (NULL);
+ }
+ nhop_set_uidx(nh, unhop->un_idx);
+ nhop_set_pxtype_flag(nh, nh_flags);
+ return (nhop_get_nhop(nh, &error));
+ }
+
+ wn = unhop->un_nhgrp_src;
+ num_nhops = unhop->un_nhgrp_count;
+
+ if (num_nhops > MAX_STACK_NHOPS) {
+ wn_new = malloc(num_nhops * sizeof(struct weightened_nhop), M_TEMP, M_NOWAIT);
+ if (wn_new == NULL)
+ return (NULL);
+ } else
+ wn_new = wn_base;
+
+ for (int i = 0; i < num_nhops; i++) {
+ uint32_t uidx = nhop_get_uidx(wn[i].nh);
+ MPASS(uidx != 0);
+ wn_new[i].nh = nl_find_nhop(fibnum, family, uidx, nh_flags, &error);
+ if (error != 0)
+ break;
+ wn_new[i].weight = wn[i].weight;
+ }
+
+ if (error == 0) {
+ struct rib_head *rh = nhop_get_rh(wn_new[0].nh);
+ struct nhgrp_object *nhg;
+
+ error = nhgrp_get_group(rh, wn_new, num_nhops, unhop->un_idx, &nhg);
+ nh = (struct nhop_object *)nhg;
+ }
+
+ if (wn_new != wn_base)
+ free(wn_new, M_TEMP);
+ return (nh);
+}
+
+static void
+destroy_unhop(struct user_nhop *unhop)
+{
+ if (unhop->un_nhop != NULL)
+ nhop_free_any(unhop->un_nhop);
+ if (unhop->un_nhop_src != NULL)
+ nhop_free_any(unhop->un_nhop_src);
+ free(unhop, M_NETLINK);
+}
+
+static void
+destroy_unhop_epoch(epoch_context_t ctx)
+{
+ struct user_nhop *unhop;
+
+ unhop = __containerof(ctx, struct user_nhop, un_epoch_ctx);
+
+ destroy_unhop(unhop);
+}
+
+static uint32_t
+find_spare_uidx(struct unhop_ctl *ctl)
+{
+ struct user_nhop *unhop, key = {};
+ uint32_t uidx = 0;
+ UN_TRACKER;
+
+ UN_RLOCK(ctl);
+ /* This should return spare uid with 75% of 65k used in ~99/100 cases */
+ for (int i = 0; i < 16; i++) {
+ key.un_idx = (arc4random() % 65536) + 65536 * 4;
+ CHT_SLIST_FIND_BYOBJ(&ctl->un_head, unhop, &key, unhop);
+ if (unhop == NULL) {
+ uidx = key.un_idx;
+ break;
+ }
+ }
+ UN_RUNLOCK(ctl);
+
+ return (uidx);
+}
+
+
+/*
+ * Actual netlink code
+ */
+struct netlink_walkargs {
+ struct nl_writer *nw;
+ struct nlmsghdr hdr;
+ struct nlpcb *so;
+ int family;
+ int error;
+ int count;
+ int dumped;
+};
+#define ENOMEM_IF_NULL(_v) if ((_v) == NULL) goto enomem
+
+static bool
+dump_nhgrp(const struct user_nhop *unhop, struct nlmsghdr *hdr,
+ struct nl_writer *nw)
+{
+
+ if (!nlmsg_reply(nw, hdr, sizeof(struct nhmsg)))
+ goto enomem;
+
+ struct nhmsg *nhm = nlmsg_reserve_object(nw, struct nhmsg);
+ nhm->nh_family = AF_UNSPEC;
+ nhm->nh_scope = 0;
+ nhm->nh_protocol = unhop->un_protocol;
+ nhm->nh_flags = 0;
+
+ nlattr_add_u32(nw, NHA_ID, unhop->un_idx);
+ nlattr_add_u16(nw, NHA_GROUP_TYPE, NEXTHOP_GRP_TYPE_MPATH);
+
+ struct weightened_nhop *wn = unhop->un_nhgrp_src;
+ uint32_t num_nhops = unhop->un_nhgrp_count;
+ /* TODO: a better API? */
+ int nla_len = sizeof(struct nlattr);
+ nla_len += NETLINK_ALIGN(num_nhops * sizeof(struct nexthop_grp));
+ struct nlattr *nla = nlmsg_reserve_data(nw, nla_len, struct nlattr);
+ if (nla == NULL)
+ goto enomem;
+ nla->nla_type = NHA_GROUP;
+ nla->nla_len = nla_len;
+ for (int i = 0; i < num_nhops; i++) {
+ struct nexthop_grp *grp = &((struct nexthop_grp *)(nla + 1))[i];
+ grp->id = nhop_get_uidx(wn[i].nh);
+ grp->weight = wn[i].weight;
+ grp->resvd1 = 0;
+ grp->resvd2 = 0;
+ }
+
+ if (nlmsg_end(nw))
+ return (true);
+enomem:
+ NL_LOG(LOG_DEBUG, "error: unable to allocate attribute memory");
+ nlmsg_abort(nw);
+ return (false);
+}
+
+static bool
+dump_nhop(const struct user_nhop *unhop, struct nlmsghdr *hdr,
+ struct nl_writer *nw)
+{
+ struct nhop_object *nh = unhop->un_nhop_src;
+
+ if (!nlmsg_reply(nw, hdr, sizeof(struct nhmsg)))
+ goto enomem;
+
+ struct nhmsg *nhm = nlmsg_reserve_object(nw, struct nhmsg);
+ ENOMEM_IF_NULL(nhm);
+ nhm->nh_family = nhop_get_neigh_family(nh);
+ nhm->nh_scope = 0; // XXX: what's that?
+ nhm->nh_protocol = unhop->un_protocol;
+ nhm->nh_flags = 0;
+
+ nlattr_add_u32(nw, NHA_ID, unhop->un_idx);
+ if (nh->nh_flags & NHF_BLACKHOLE) {
+ nlattr_add_flag(nw, NHA_BLACKHOLE);
+ goto done;
+ }
+ nlattr_add_u32(nw, NHA_OIF, nh->nh_ifp->if_index);
+
+ switch (nh->gw_sa.sa_family) {
+#ifdef INET
+ case AF_INET:
+ nlattr_add(nw, NHA_GATEWAY, 4, &nh->gw4_sa.sin_addr);
+ break;
+#endif
+#ifdef INET6
+ case AF_INET6:
+ {
+ struct in6_addr addr = nh->gw6_sa.sin6_addr;
+ in6_clearscope(&addr);
+ nlattr_add(nw, NHA_GATEWAY, 16, &addr);
+ break;
+ }
+#endif
+ }
+
+done:
+ if (nlmsg_end(nw))
+ return (true);
+enomem:
+ nlmsg_abort(nw);
+ return (false);
+}
+
+static void
+dump_unhop(const struct user_nhop *unhop, struct nlmsghdr *hdr,
+ struct nl_writer *nw)
+{
+ if (unhop->un_nhop_src != NULL)
+ dump_nhop(unhop, hdr, nw);
+ else
+ dump_nhgrp(unhop, hdr, nw);
+}
+
+static int
+delete_unhop(struct unhop_ctl *ctl, struct nlmsghdr *hdr, uint32_t uidx)
+{
+ struct user_nhop *unhop_ret, *unhop_base, *unhop_chain;
+
+ struct user_nhop key = { .un_idx = uidx };
+
+ UN_WLOCK(ctl);
+
+ CHT_SLIST_FIND_BYOBJ(&ctl->un_head, unhop, &key, unhop_base);
+
+ if (unhop_base != NULL) {
+ CHT_SLIST_REMOVE(&ctl->un_head, unhop, unhop_base, unhop_ret);
+ IF_DEBUG_LEVEL(LOG_DEBUG2) {
+ char nhbuf[NHOP_PRINT_BUFSIZE];
+ nhop_print_buf_any(unhop_base->un_nhop, nhbuf, sizeof(nhbuf));
+ FIB_NH_LOG(LOG_DEBUG3, unhop_base->un_nhop,
+ "removed base nhop %u: %s", uidx, nhbuf);
+ }
+ /* Unlink all child nexhops as well, keeping the chain intact */
+ unhop_chain = unhop_base->un_nextchild;
+ while (unhop_chain != NULL) {
+ CHT_SLIST_REMOVE(&ctl->un_head, unhop, unhop_chain,
+ unhop_ret);
+ MPASS(unhop_chain == unhop_ret);
+ IF_DEBUG_LEVEL(LOG_DEBUG3) {
+ char nhbuf[NHOP_PRINT_BUFSIZE];
+ nhop_print_buf_any(unhop_chain->un_nhop,
+ nhbuf, sizeof(nhbuf));
+ FIB_NH_LOG(LOG_DEBUG3, unhop_chain->un_nhop,
+ "removed child nhop %u: %s", uidx, nhbuf);
+ }
+ unhop_chain = unhop_chain->un_nextchild;
+ }
+ }
+
+ UN_WUNLOCK(ctl);
+
+ if (unhop_base == NULL) {
+ NL_LOG(LOG_DEBUG, "unable to find unhop %u", uidx);
+ return (ENOENT);
+ }
+
+ /* Report nexthop deletion */
+ struct netlink_walkargs wa = {
+ .hdr.nlmsg_pid = hdr->nlmsg_pid,
+ .hdr.nlmsg_seq = hdr->nlmsg_seq,
+ .hdr.nlmsg_flags = hdr->nlmsg_flags,
+ .hdr.nlmsg_type = NL_RTM_DELNEXTHOP,
+ };
+
+ struct nl_writer nw = {};
+ if (!nlmsg_get_group_writer(&nw, NLMSG_SMALL, NETLINK_ROUTE, RTNLGRP_NEXTHOP)) {
+ NL_LOG(LOG_DEBUG, "error allocating message writer");
+ return (ENOMEM);
+ }
+
+ dump_unhop(unhop_base, &wa.hdr, &nw);
+ nlmsg_flush(&nw);
+
+ while (unhop_base != NULL) {
+ unhop_chain = unhop_base->un_nextchild;
+ epoch_call(net_epoch_preempt, destroy_unhop_epoch,
+ &unhop_base->un_epoch_ctx);
+ unhop_base = unhop_chain;
+ }
+
+ return (0);
+}
+
+static void
+consider_resize(struct unhop_ctl *ctl, uint32_t new_size)
+{
+ void *new_ptr = NULL;
+ size_t alloc_size;
+
+ if (new_size == 0)
+ return;
+
+ if (new_size != 0) {
+ alloc_size = CHT_SLIST_GET_RESIZE_SIZE(new_size);
+ new_ptr = malloc(alloc_size, M_NETLINK, M_NOWAIT | M_ZERO);
+ if (new_ptr == NULL)
+ return;
+ }
+
+ NL_LOG(LOG_DEBUG, "resizing hash: %u -> %u", ctl->un_head.hash_size, new_size);
+ UN_WLOCK(ctl);
+ if (new_ptr != NULL) {
+ CHT_SLIST_RESIZE(&ctl->un_head, unhop, new_ptr, new_size);
+ }
+ UN_WUNLOCK(ctl);
+
+
+ if (new_ptr != NULL)
+ free(new_ptr, M_NETLINK);
+}
+
+static bool __noinline
+vnet_init_unhops()
+{
+ uint32_t num_buckets = 16;
+ size_t alloc_size = CHT_SLIST_GET_RESIZE_SIZE(num_buckets);
+
+ struct unhop_ctl *ctl = malloc(sizeof(struct unhop_ctl), M_NETLINK,
+ M_NOWAIT | M_ZERO);
+ if (ctl == NULL)
+ return (false);
+
+ void *ptr = malloc(alloc_size, M_NETLINK, M_NOWAIT | M_ZERO);
+ if (ptr == NULL) {
+ free(ctl, M_NETLINK);
+ return (false);
+ }
+ CHT_SLIST_INIT(&ctl->un_head, ptr, num_buckets);
+ UN_LOCK_INIT(ctl);
+
+ if (!atomic_cmpset_ptr((uintptr_t *)&V_un_ctl, (uintptr_t)NULL, (uintptr_t)ctl)) {
+ free(ptr, M_NETLINK);
+ free(ctl, M_NETLINK);
+ }
+
+ if (atomic_load_ptr(&V_un_ctl) == NULL)
+ return (false);
+
+ NL_LOG(LOG_NOTICE, "UNHOPS init done");
+
+ return (true);
+}
+
+static void
+vnet_destroy_unhops(const void *unused __unused)
+{
+ struct unhop_ctl *ctl = atomic_load_ptr(&V_un_ctl);
+ struct user_nhop *unhop, *tmp;
+
+ if (ctl == NULL)
+ return;
+ V_un_ctl = NULL;
+
+ /* Wait till all unhop users finish their reads */
+ epoch_wait_preempt(net_epoch_preempt);
+
+ UN_WLOCK(ctl);
+ CHT_SLIST_FOREACH_SAFE(&ctl->un_head, unhop, unhop, tmp) {
+ destroy_unhop(unhop);
+ } CHT_SLIST_FOREACH_SAFE_END;
+ UN_WUNLOCK(ctl);
+
+ free(ctl->un_head.ptr, M_NETLINK);
+ free(ctl, M_NETLINK);
+}
+VNET_SYSUNINIT(vnet_destroy_unhops, SI_SUB_PROTO_IF, SI_ORDER_ANY,
+ vnet_destroy_unhops, NULL);
+
+static int
+nlattr_get_nhg(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ int error = 0;
+
+ /* Verify attribute correctness */
+ struct nexthop_grp *grp = NLA_DATA(nla);
+ int data_len = NLA_DATA_LEN(nla);
+
+ int count = data_len / sizeof(*grp);
+ if (count == 0 || (count * sizeof(*grp) != data_len)) {
+ NL_LOG(LOG_DEBUG, "Invalid length for RTA_GROUP: %d", data_len);
+ return (EINVAL);
+ }
+
+ *((struct nlattr **)target) = nla;
+ return (error);
+}
+
+struct nl_parsed_nhop {
+ uint32_t nha_id;
+ uint8_t nha_blackhole;
+ uint8_t nha_groups;
+ struct ifnet *nha_oif;
+ struct sockaddr *nha_gw;
+ struct nlattr *nha_group;
+ uint8_t nh_family;
+ uint8_t nh_protocol;
+};
+
+#define _IN(_field) offsetof(struct nhmsg, _field)
+#define _OUT(_field) offsetof(struct nl_parsed_nhop, _field)
+static const struct nlfield_parser nlf_p_nh[] = {
+ { .off_in = _IN(nh_family), .off_out = _OUT(nh_family), .cb = nlf_get_u8 },
+ { .off_in = _IN(nh_protocol), .off_out = _OUT(nh_protocol), .cb = nlf_get_u8 },
+};
+
+static const struct nlattr_parser nla_p_nh[] = {
+ { .type = NHA_ID, .off = _OUT(nha_id), .cb = nlattr_get_uint32 },
+ { .type = NHA_GROUP, .off = _OUT(nha_group), .cb = nlattr_get_nhg },
+ { .type = NHA_BLACKHOLE, .off = _OUT(nha_blackhole), .cb = nlattr_get_flag },
+ { .type = NHA_OIF, .off = _OUT(nha_oif), .cb = nlattr_get_ifp },
+ { .type = NHA_GATEWAY, .off = _OUT(nha_gw), .cb = nlattr_get_ip },
+ { .type = NHA_GROUPS, .off = _OUT(nha_groups), .cb = nlattr_get_flag },
+};
+#undef _IN
+#undef _OUT
+NL_DECLARE_PARSER(nhmsg_parser, struct nhmsg, nlf_p_nh, nla_p_nh);
+
+static bool
+eligible_nhg(const struct nhop_object *nh)
+{
+ return (nh->nh_flags & NHF_GATEWAY);
+}
+
+static int
+newnhg(struct unhop_ctl *ctl, struct nl_parsed_nhop *attrs, struct user_nhop *unhop)
+{
+ struct nexthop_grp *grp = NLA_DATA(attrs->nha_group);
+ int count = NLA_DATA_LEN(attrs->nha_group) / sizeof(*grp);
+ struct weightened_nhop *wn;
+
+ wn = malloc(sizeof(*wn) * count, M_NETLINK, M_NOWAIT | M_ZERO);
+ if (wn == NULL)
+ return (ENOMEM);
+
+ for (int i = 0; i < count; i++) {
+ struct user_nhop *unhop;
+ unhop = nl_find_base_unhop(ctl, grp[i].id);
+ if (unhop == NULL) {
+ NL_LOG(LOG_DEBUG, "unable to find uidx %u", grp[i].id);
+ free(wn, M_NETLINK);
+ return (ESRCH);
+ } else if (unhop->un_nhop_src == NULL) {
+ NL_LOG(LOG_DEBUG, "uidx %u is a group, nested group unsupported",
+ grp[i].id);
+ free(wn, M_NETLINK);
+ return (ENOTSUP);
+ } else if (!eligible_nhg(unhop->un_nhop_src)) {
+ NL_LOG(LOG_DEBUG, "uidx %u nhop is not mpath-eligible",
+ grp[i].id);
+ free(wn, M_NETLINK);
+ return (ENOTSUP);
+ }
+ /*
+ * TODO: consider more rigid eligibility checks:
+ * restrict nexthops with the same gateway
+ */
+ wn[i].nh = unhop->un_nhop_src;
+ wn[i].weight = grp[i].weight;
+ }
+ unhop->un_nhgrp_src = wn;
+ unhop->un_nhgrp_count = count;
+ return (0);
+}
+
+static int
+newnhop(struct nl_parsed_nhop *attrs, struct user_nhop *unhop)
+{
+ struct ifaddr *ifa = NULL;
+ struct nhop_object *nh;
+ int error;
+
+ if (!attrs->nha_blackhole) {
+ if (attrs->nha_gw == NULL) {
+ NL_LOG(LOG_DEBUG, "missing NHA_GATEWAY");
+ return (EINVAL);
+ }
+ if (attrs->nha_oif == NULL) {
+ NL_LOG(LOG_DEBUG, "missing NHA_OIF");
+ return (EINVAL);
+ }
+ if (ifa == NULL)
+ ifa = ifaof_ifpforaddr(attrs->nha_gw, attrs->nha_oif);
+ if (ifa == NULL) {
+ NL_LOG(LOG_DEBUG, "Unable to determine default source IP");
+ return (EINVAL);
+ }
+ }
+
+ int family = attrs->nha_gw != NULL ? attrs->nha_gw->sa_family : attrs->nh_family;
+
+ nh = nhop_alloc(RT_DEFAULT_FIB, family);
+ if (nh == NULL) {
+ NL_LOG(LOG_DEBUG, "Unable to allocate nexthop");
+ return (ENOMEM);
+ }
+ nhop_set_uidx(nh, attrs->nha_id);
+
+ if (attrs->nha_blackhole)
+ nhop_set_blackhole(nh, NHF_BLACKHOLE);
+ else {
+ nhop_set_gw(nh, attrs->nha_gw, true);
+ nhop_set_transmit_ifp(nh, attrs->nha_oif);
+ nhop_set_src(nh, ifa);
+ }
+
+ error = nhop_get_unlinked(nh);
+ if (error != 0) {
+ NL_LOG(LOG_DEBUG, "unable to finalize nexthop");
+ return (error);
+ }
+
+ IF_DEBUG_LEVEL(LOG_DEBUG2) {
+ char nhbuf[NHOP_PRINT_BUFSIZE];
+ nhop_print_buf(nh, nhbuf, sizeof(nhbuf));
+ NL_LOG(LOG_DEBUG2, "Adding unhop %u: %s", attrs->nha_id, nhbuf);
+ }
+
+ unhop->un_nhop_src = nh;
+ return (0);
+}
+
+static int
+rtnl_handle_newnhop(struct nlmsghdr *hdr, struct nlpcb *nlp,
+ struct nl_pstate *npt)
+{
+ struct user_nhop *unhop;
+ int error;
+
+ if ((__predict_false(V_un_ctl == NULL)) && (!vnet_init_unhops()))
+ return (ENOMEM);
+ struct unhop_ctl *ctl = V_un_ctl;
+
+ struct nl_parsed_nhop attrs = {};
+ error = nl_parse_nlmsg(hdr, &nhmsg_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ /*
+ * Get valid nha_id. Treat nha_id == 0 (auto-assignment) as a second-class
+ * citizen.
+ */
+ if (attrs.nha_id == 0) {
+ attrs.nha_id = find_spare_uidx(ctl);
+ if (attrs.nha_id == 0) {
+ NL_LOG(LOG_DEBUG, "Unable to get spare uidx");
+ return (ENOSPC);
+ }
+ }
+
+ NL_LOG(LOG_DEBUG, "IFINDEX %d", attrs.nha_oif ? attrs.nha_oif->if_index : 0);
+
+ unhop = malloc(sizeof(struct user_nhop), M_NETLINK, M_NOWAIT | M_ZERO);
+ if (unhop == NULL) {
+ NL_LOG(LOG_DEBUG, "Unable to allocate user_nhop");
+ return (ENOMEM);
+ }
+ unhop->un_idx = attrs.nha_id;
+ unhop->un_protocol = attrs.nh_protocol;
+
+ if (attrs.nha_group)
+ error = newnhg(ctl, &attrs, unhop);
+ else
+ error = newnhop(&attrs, unhop);
+
+ if (error != 0) {
+ free(unhop, M_NETLINK);
+ return (error);
+ }
+
+ UN_WLOCK(ctl);
+ /* Check if uidx already exists */
+ struct user_nhop *tmp = NULL;
+ CHT_SLIST_FIND_BYOBJ(&ctl->un_head, unhop, unhop, tmp);
+ if (tmp != NULL) {
+ UN_WUNLOCK(ctl);
+ NL_LOG(LOG_DEBUG, "nhop idx %u already exists", attrs.nha_id);
+ destroy_unhop(unhop);
+ return (EEXIST);
+ }
+ CHT_SLIST_INSERT_HEAD(&ctl->un_head, unhop, unhop);
+ uint32_t num_buckets_new = CHT_SLIST_GET_RESIZE_BUCKETS(&ctl->un_head);
+ UN_WUNLOCK(ctl);
+
+ /* Report addition of the next nexhop */
+ struct netlink_walkargs wa = {
+ .hdr.nlmsg_pid = hdr->nlmsg_pid,
+ .hdr.nlmsg_seq = hdr->nlmsg_seq,
+ .hdr.nlmsg_flags = hdr->nlmsg_flags,
+ .hdr.nlmsg_type = NL_RTM_NEWNEXTHOP,
+ };
+
+ struct nl_writer nw = {};
+ if (!nlmsg_get_group_writer(&nw, NLMSG_SMALL, NETLINK_ROUTE, RTNLGRP_NEXTHOP)) {
+ NL_LOG(LOG_DEBUG, "error allocating message writer");
+ return (ENOMEM);
+ }
+
+ dump_unhop(unhop, &wa.hdr, &nw);
+ nlmsg_flush(&nw);
+
+ consider_resize(ctl, num_buckets_new);
+
+ return (0);
+}
+
+static int
+rtnl_handle_delnhop(struct nlmsghdr *hdr, struct nlpcb *nlp,
+ struct nl_pstate *npt)
+{
+ struct unhop_ctl *ctl = atomic_load_ptr(&V_un_ctl);
+ int error;
+
+ if (__predict_false(ctl == NULL))
+ return (ESRCH);
+
+ struct nl_parsed_nhop attrs = {};
+ error = nl_parse_nlmsg(hdr, &nhmsg_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ if (attrs.nha_id == 0) {
+ NL_LOG(LOG_DEBUG, "NHA_ID not set");
+ return (EINVAL);
+ }
+
+ error = delete_unhop(ctl, hdr, attrs.nha_id);
+
+ return (error);
+}
+
+static bool
+match_unhop(const struct nl_parsed_nhop *attrs, struct user_nhop *unhop)
+{
+ if (attrs->nha_id != 0 && unhop->un_idx != attrs->nha_id)
+ return (false);
+ if (attrs->nha_groups != 0 && unhop->un_nhgrp_src == NULL)
+ return (false);
+ if (attrs->nha_oif != NULL &&
+ (unhop->un_nhop_src == NULL || unhop->un_nhop_src->nh_ifp != attrs->nha_oif))
+ return (false);
+
+ return (true);
+}
+
+static int
+rtnl_handle_getnhop(struct nlmsghdr *hdr, struct nlpcb *nlp,
+ struct nl_pstate *npt)
+{
+ struct unhop_ctl *ctl = atomic_load_ptr(&V_un_ctl);
+ struct user_nhop *unhop;
+ UN_TRACKER;
+ int error;
+
+ if (__predict_false(ctl == NULL))
+ return (ESRCH);
+
+ struct nl_parsed_nhop attrs = {};
+ error = nl_parse_nlmsg(hdr, &nhmsg_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ struct netlink_walkargs wa = {
+ .nw = npt->nw,
+ .hdr.nlmsg_pid = hdr->nlmsg_pid,
+ .hdr.nlmsg_seq = hdr->nlmsg_seq,
+ .hdr.nlmsg_flags = hdr->nlmsg_flags,
+ .hdr.nlmsg_type = NL_RTM_NEWNEXTHOP,
+ };
+
+ if (attrs.nha_id != 0) {
+ NL_LOG(LOG_DEBUG2, "searching for uidx %u", attrs.nha_id);
+ struct user_nhop key= { .un_idx = attrs.nha_id };
+ UN_RLOCK(ctl);
+ CHT_SLIST_FIND_BYOBJ(&ctl->un_head, unhop, &key, unhop);
+ UN_RUNLOCK(ctl);
+
+ if (unhop == NULL)
+ return (ESRCH);
+ dump_unhop(unhop, &wa.hdr, wa.nw);
+ return (0);
+ }
+
+ UN_RLOCK(ctl);
+ wa.hdr.nlmsg_flags |= NLM_F_MULTI;
+ CHT_SLIST_FOREACH(&ctl->un_head, unhop, unhop) {
+ if (UNHOP_IS_MASTER(unhop) && match_unhop(&attrs, unhop))
+ dump_unhop(unhop, &wa.hdr, wa.nw);
+ } CHT_SLIST_FOREACH_END;
+ UN_RUNLOCK(ctl);
+
+ if (wa.error == 0) {
+ if (!nlmsg_end_dump(wa.nw, wa.error, &wa.hdr))
+ return (ENOMEM);
+ }
+ return (0);
+}
+
+static const struct rtnl_cmd_handler cmd_handlers[] = {
+ {
+ .cmd = NL_RTM_NEWNEXTHOP,
+ .name = "RTM_NEWNEXTHOP",
+ .cb = &rtnl_handle_newnhop,
+ .priv = PRIV_NET_ROUTE,
+ },
+ {
+ .cmd = NL_RTM_DELNEXTHOP,
+ .name = "RTM_DELNEXTHOP",
+ .cb = &rtnl_handle_delnhop,
+ .priv = PRIV_NET_ROUTE,
+ },
+ {
+ .cmd = NL_RTM_GETNEXTHOP,
+ .name = "RTM_GETNEXTHOP",
+ .cb = &rtnl_handle_getnhop,
+ }
+};
+
+static const struct nlhdr_parser *all_parsers[] = { &nhmsg_parser };
+
+void
+rtnl_nexthops_init()
+{
+ NL_VERIFY_PARSERS(all_parsers);
+ rtnl_register_messages(cmd_handlers, NL_ARRAY_LEN(cmd_handlers));
+}
diff --git a/sys/netlink/route/route.h b/sys/netlink/route/route.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/route.h
@@ -0,0 +1,366 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Route-related (RTM_<NEW|DEL|GET>ROUTE) message header and attributes.
+ */
+
+#ifndef _NETLINK_ROUTE_ROUTE_H_
+#define _NETLINK_ROUTE_ROUTE_H_
+
+/* Base header for all of the relevant messages */
+struct rtmsg {
+ unsigned char rtm_family; /* address family */
+ unsigned char rtm_dst_len; /* Prefix length */
+ unsigned char rtm_src_len; /* Source prefix length (not used) */
+ unsigned char rtm_tos; /* Type of service (not used) */
+ unsigned char rtm_table; /* rtable id */
+ unsigned char rtm_protocol; /* Routing protocol id (RTPROT_) */
+ unsigned char rtm_scope; /* Route distance (RT_SCOPE_) */
+ unsigned char rtm_type; /* Route type (RTN_) */
+ unsigned rtm_flags; /* Route flags (RTM_F_) */
+};
+
+/*
+ * RFC 3549, 3.1.1, route type (rtm_type field).
+ */
+enum {
+ RTN_UNSPEC,
+ RTN_UNICAST, /* Unicast route */
+ RTN_LOCAL, /* Accept locally (not supported) */
+ RTN_BROADCAST, /* Accept locally as broadcast, send as broadcast */
+ RTN_ANYCAST, /* Accept locally as broadcast, but send as unicast */
+ RTN_MULTICAST, /* Multicast route */
+ RTN_BLACKHOLE, /* Drop traffic towards destination */
+ RTN_UNREACHABLE, /* Destination is unreachable */
+ RTN_PROHIBIT, /* Administratively prohibited */
+ RTN_THROW, /* Not in this table (not supported) */
+ RTN_NAT, /* Translate this address (not supported) */
+ RTN_XRESOLVE, /* Use external resolver (not supported) */
+ __RTN_MAX,
+};
+#define RTN_MAX (__RTN_MAX - 1)
+
+/*
+ * RFC 3549, 3.1.1, protocol (Identifies what/who added the route).
+ * Values larger than RTPROT_STATIC(4) are not interpreted by the
+ * kernel, they are just for user information.
+ */
+#define RTPROT_UNSPEC 0
+#define RTPROT_REDIRECT 1 /* Route installed by ICMP redirect */
+#define RTPROT_KERNEL 2 /* Route installed by kernel */
+#define RTPROT_BOOT 3 /* Route installed during boot */
+#define RTPROT_STATIC 4 /* Route installed by administrator */
+
+#define RTPROT_GATED 8 /* Gated */
+#define RTPROT_RA 9 /* rtadvd */
+#define RTPROT_MRT 10 /* MRT/Merit (RFC 6396) */
+#define RTPROT_ZEBRA 11 /* Quagga/Frr */
+#define RTPROT_BIRD 12 /* Bird */
+#define RTPROT_DNROUTED 13 /* dnroute*/
+#define RTPROT_XORP 14 /* XORP */
+#define RTPROT_NTK 15 /* Netsukuku routing system */
+#define RTPROT_DHCP 16 /* DHCP client */
+#define RTPROT_MROUTED 17 /* Multicast daemon */
+#define RTPROT_KEEPALIVED 18 /* Keepalived daemon */
+#define RTPROT_BABEL 42 /* Babel daemon */
+#define RTPROT_OPENR 99 /* Open Routing (Open/R) Routes */
+#define RTPROT_BGP 186 /* BGP Routes */
+#define RTPROT_ISIS 187 /* ISIS Routes */
+#define RTPROT_OSPF 188 /* OSPF Routes */
+#define RTPROT_RIP 189 /* RIP Routes */
+#define RTPROT_EIGRP 192 /* EIGRP Routes */
+
+/*
+ * RFC 3549 3.1.1 Route scope (valid distance to destination).
+ *
+ * The values between RT_SCOPE_UNIVERSE(0) and RT_SCOPE_SITE(200)
+ * are available to the user.
+ */
+enum rt_scope_t {
+ RT_SCOPE_UNIVERSE = 0,
+ /* User defined values */
+ RT_SCOPE_SITE = 200,
+ RT_SCOPE_LINK = 253,
+ RT_SCOPE_HOST = 254,
+ RT_SCOPE_NOWHERE = 255
+};
+
+/*
+ * RFC 3549 3.1.1 Route flags (rtm_flags).
+ * Is a composition of RTNH_F flags (0x1..0x40 range), RTM_F flags (below)
+ * and per-protocol (IPv4/IPv6) flags.
+ */
+#define RTM_F_NOTIFY 0x00000100 /* not supported */
+#define RTM_F_CLONED 0x00000200 /* not supported */
+#define RTM_F_EQUALIZE 0x00000400 /* not supported */
+#define RTM_F_PREFIX 0x00000800 /* not supported */
+#define RTM_F_LOOKUP_TABLE 0x00001000 /* not supported */
+#define RTM_F_FIB_MATCH 0x00002000 /* not supported */
+#define RTM_F_OFFLOAD 0x00004000 /* not supported */
+#define RTM_F_TRAP 0x00008000 /* not supported */
+#define RTM_F_OFFLOAD_FAILED 0x20000000 /* not supported */
+
+/* Compatibility handling helpers */
+#ifndef _KERNEL
+#define NL_RTM_HDRLEN ((int)sizeof(struct rtmsg))
+#define RTM_RTA(_rtm) ((struct rtattr *)((char *)(_rtm) + NL_RTM_HDRLEN))
+#define RTM_PAYLOAD(_hdr) NLMSG_PAYLOAD((_hdr), NL_RTM_HDRLEN)
+#endif
+
+/*
+ * Routing table identifiers.
+ * FreeBSD route table numbering starts from 0, where 0 is a valid default routing table.
+ * Indicating "all tables" via netlink can be done by not including RTA_TABLE attribute
+ * and keeping rtm_table=0 (compatibility) or setting RTA_TABLE value to RT_TABLE_UNSPEC.
+ */
+#define RT_TABLE_MAIN 0 /* RT_DEFAULT_FIB */
+#define RT_TABLE_UNSPEC 0xFFFFFFFF /* RT_ALL_FIBS */
+
+enum rtattr_type_t {
+ NL_RTA_UNSPEC,
+ NL_RTA_DST = 1, /* binary, IPv4/IPv6 destination */
+ NL_RTA_SRC = 2, /* binary, preferred source address */
+ NL_RTA_IIF = 3, /* not supported */
+ NL_RTA_OIF = 4, /* u32, transmit ifindex */
+ NL_RTA_GATEWAY = 5, /* binary: IPv4/IPv6 gateway */
+ NL_RTA_PRIORITY = 6, /* not supported */
+ NL_RTA_PREFSRC = 7, /* not supported */
+ NL_RTA_METRICS = 8, /* nested, list of NL_RTAX* attrs */
+ NL_RTA_MULTIPATH = 9, /* binary, array of struct rtnexthop */
+ NL_RTA_PROTOINFO = 10, /* not supported / deprecated */
+ NL_RTA_KNH_ID = 10, /* u32, FreeBSD specific, kernel nexthop index */
+ NL_RTA_FLOW = 11, /* not supported */
+ NL_RTA_CACHEINFO = 12, /* not supported */
+ NL_RTA_SESSION = 13, /* not supported / deprecated */
+ NL_RTA_MP_ALGO = 14, /* not supported / deprecated */
+ NL_RTA_RTFLAGS = 14, /* u32, FreeBSD specific, */
+ NL_RTA_TABLE = 15, /* u32, fibnum */
+ NL_RTA_MARK = 16, /* not supported */
+ NL_RTA_MFC_STATS = 17, /* not supported */
+ NL_RTA_VIA = 18, /* binary, struct rtvia */
+ NL_RTA_NEWDST = 19, /* not supported */
+ NL_RTA_PREF = 20, /* not supported */
+ NL_RTA_ENCAP_TYPE = 21, /* not supported */
+ NL_RTA_ENCAP = 22, /* not supported */
+ NL_RTA_EXPIRES = 23, /* u32, seconds till expiration */
+ NL_RTA_PAD = 24, /* not supported */
+ NL_RTA_UID = 25, /* not supported */
+ NL_RTA_TTL_PROPAGATE = 26, /* not supported */
+ NL_RTA_IP_PROTO = 27, /* not supported */
+ NL_RTA_SPORT = 28, /* not supported */
+ NL_RTA_DPORT = 29, /* not supported */
+ NL_RTA_NH_ID = 30, /* u32, nexthop/nexthop group index */
+ __RTA_MAX
+};
+#define NL_RTA_MAX (__RTA_MAX - 1)
+
+/*
+ * Attributes that can be used as filters:
+ *
+ */
+
+#ifndef _KERNEL
+/*
+ * RTA_* space has clashes with rtsock namespace.
+ * Use NL_RTA_ prefix in the kernel and map to
+ * RTA_ for userland.
+ */
+#define RTA_UNSPEC NL_RTA_UNSPEC
+#define RTA_DST NL_RTA_DST
+#define RTA_SRC NL_RTA_SRC
+#define RTA_IIF NL_RTA_IIF
+#define RTA_OIF NL_RTA_OIF
+#define RTA_GATEWAY NL_RTA_GATEWAY
+#define RTA_PRIORITY NL_RTA_PRIORITY
+#define RTA_PREFSRC NL_RTA_PREFSRC
+#define RTA_METRICS NL_RTA_METRICS
+#define RTA_MULTIPATH NL_RTA_MULTIPATH
+#define RTA_PROTOINFO NL_RTA_PROTOINFO
+#define RTA_KNH_ID NL_RTA_KNH_ID
+#define RTA_FLOW NL_RTA_FLOW
+#define RTA_CACHEINFO NL_RTA_CACHEINFO
+#define RTA_SESSION NL_RTA_SESSION
+#define RTA_MP_ALGO NL_RTA_MP_ALGO
+#define RTA_TABLE NL_RTA_TABLE
+#define RTA_MARK NL_RTA_MARK
+#define RTA_MFC_STATS NL_RTA_MFC_STATS
+#define RTA_VIA NL_RTA_VIA
+#define RTA_NEWDST NL_RTA_NEWDST
+#define RTA_PREF NL_RTA_PREF
+#define RTA_ENCAP_TYPE NL_RTA_ENCAP_TYPE
+#define RTA_ENCAP NL_RTA_ENCAP
+#define RTA_EXPIRES NL_RTA_EXPIRES
+#define RTA_PAD NL_RTA_PAD
+#define RTA_UID NL_RTA_UID
+#define RTA_TTL_PROPAGATE NL_RTA_TTL_PROPAGATE
+#define RTA_IP_PROTO NL_RTA_IP_PROTO
+#define RTA_SPORT NL_RTA_SPORT
+#define RTA_DPORT NL_RTA_DPORT
+#define RTA_NH_ID NL_RTA_NH_ID
+#define RTA_MAX NL_RTA_MAX
+#endif
+
+/* route attribute header */
+struct rtattr {
+ unsigned short rta_len;
+ unsigned short rta_type;
+};
+
+#define NL_RTA_ALIGN_SIZE NL_ITEM_ALIGN_SIZE
+#define NL_RTA_ALIGN NL_ITEM_ALIGN
+#define NL_RTA_HDRLEN ((int)sizeof(struct rtattr))
+#define NL_RTA_DATA_LEN(_rta) ((int)((_rta)->rta_len - NL_RTA_HDRLEN))
+#define NL_RTA_DATA(_rta) NL_ITEM_DATA(_rta, NL_RTA_HDRLEN)
+#define NL_RTA_DATA_CONST(_rta) NL_ITEM_DATA_CONST(_rta, NL_RTA_HDRLEN)
+
+/* Compatibility attribute handling helpers */
+#ifndef _KERNEL
+#define RTA_ALIGNTO NL_RTA_ALIGN_SIZE
+#define RTA_ALIGN(_len) NL_RTA_ALIGN(_len)
+#define _RTA_LEN(_rta) ((int)(_rta)->rta_len)
+#define _RTA_ALIGNED_LEN(_rta) RTA_ALIGN(_RTA_LEN(_rta))
+#define RTA_OK(_rta, _len) NL_ITEM_OK(_rta, _len, NL_RTA_HDRLEN, _RTA_LEN)
+#define RTA_NEXT(_rta, _len) NL_ITEM_ITER(_rta, _len, _RTA_ALIGNED_LEN)
+#define RTA_LENGTH(_len) (NL_RTA_HDRLEN + (_len))
+#define RTA_SPACE(_len) RTA_ALIGN(RTA_LENGTH(_len))
+#define RTA_DATA(_rta) NL_RTA_DATA(_rta)
+#define RTA_PAYLOAD(_rta) ((int)(_RTA_LEN(_rta) - NL_RTA_HDRLEN))
+#endif
+
+/* RTA attribute headers */
+
+/* RTA_VIA */
+struct rtvia {
+ sa_family_t rtvia_family;
+ uint8_t rtvia_addr[0];
+};
+
+/*
+ * RTA_METRICS is a nested attribute, consisting of a list of
+ * TLVs with types defined below.
+ */
+ enum {
+ NL_RTAX_UNSPEC,
+ NL_RTAX_LOCK = 1, /* not supported */
+ NL_RTAX_MTU = 2, /* desired path MTU */
+ NL_RTAX_WINDOW = 3, /* not supported */
+ NL_RTAX_RTT = 4, /* not supported */
+ NL_RTAX_RTTVAR = 5, /* not supported */
+ NL_RTAX_SSTHRESH = 6, /* not supported */
+ NL_RTAX_CWND = 7, /* not supported */
+ NL_RTAX_ADVMSS = 8, /* not supported */
+ NL_RTAX_REORDERING = 9, /* not supported */
+ NL_RTAX_HOPLIMIT = 10, /* not supported */
+ NL_RTAX_INITCWND = 11, /* not supporrted */
+ NL_RTAX_FEATURES = 12, /* not supported */
+ NL_RTAX_RTO_MIN = 13, /* not supported */
+ NL_RTAX_INITRWND = 14, /* not supported */
+ NL_RTAX_QUICKACK = 15, /* not supported */
+ NL_RTAX_CC_ALGO = 15, /* not supported */
+ NL_RTAX_FASTOPEN_NO_COOKIE = 16, /* not supported */
+ __NL_RTAX_MAX
+};
+#define NL_RTAX_MAX (__NL_RTAX_MAX - 1)
+
+#define RTAX_FEATURE_ECN (1 << 0)
+#define RTAX_FEATURE_SACK (1 << 1)
+#define RTAX_FEATURE_TIMESTAMP (1 << 2)
+#define RTAX_FEATURE_ALLFRAG (1 << 3)
+
+#define RTAX_FEATURE_MASK \
+ (RTAX_FEATURE_ECN | RTAX_FEATURE_SACK | RTAX_FEATURE_TIMESTAMP | \
+ RTAX_FEATURE_ALLFRAG)
+
+#ifndef _KERNEL
+
+/*
+ * RTAX_* space clashes with rtsock namespace.
+ * Use NL_RTAX_ prefix in the kernel and map to
+ * RTAX_ for userland.
+ */
+#define RTAX_UNSPEC NL_RTAX_UNSPEC
+#define RTAX_LOCK NL_RTAX_LOCK
+#define RTAX_MTU NL_RTAX_MTU
+#define RTAX_WINDOW NL_RTAX_WINDOW
+#define RTAX_RTT NL_RTAX_RTT
+#define RTAX_RTTVAR NL_RTAX_RTTVAR
+#define RTAX_SSTHRESH NL_RTAX_SSTHRESH
+#define RTAX_CWND NL_RTAX_CWND
+#define RTAX_ADVMSS NL_RTAX_ADVMSS
+#define RTAX_REORDERING NL_RTAX_REORDERING
+#define RTAX_HOPLIMIT NL_RTAX_HOPLIMIT
+#define RTAX_INITCWND NL_RTAX_INITCWND
+#define RTAX_FEATURES NL_RTAX_FEATURES
+#define RTAX_RTO_MIN NL_RTAX_RTO_MIN
+#define RTAX_INITRWND NL_RTAX_INITRWND
+#define RTAX_QUICKACK NL_RTAX_QUICKACK
+#define RTAX_CC_ALGO NL_RTAX_CC_ALGO
+#define RTAX_FASTOPEN_NO_COOKIE NL_RTAX_FASTOPEN_NO_COOKIE
+#endif
+
+/*
+ * RTA_MULTIPATH consists of an array of rtnexthop structures.
+ * Each rtnexthop structure contains RTA_GATEWAY or RTA_VIA
+ * attribute following the header.
+ */
+struct rtnexthop {
+ unsigned short rtnh_len;
+ unsigned char rtnh_flags;
+ unsigned char rtnh_hops; /* nexthop weight */
+ int rtnh_ifindex;
+};
+
+/* rtnh_flags */
+#define RTNH_F_DEAD 0x01 /* not supported */
+#define RTNH_F_PERVASIVE 0x02 /* not supported */
+#define RTNH_F_ONLINK 0x04 /* not supported */
+#define RTNH_F_OFFLOAD 0x08 /* not supported */
+#define RTNH_F_LINKDOWN 0x10 /* not supported */
+#define RTNH_F_UNRESOLVED 0x20 /* not supported */
+#define RTNH_F_TRAP 0x40 /* not supported */
+
+#define RTNH_COMPARE_MASK (RTNH_F_DEAD | RTNH_F_LINKDOWN | \
+ RTNH_F_OFFLOAD | RTNH_F_TRAP)
+
+/* Macros to handle hexthops */
+#define RTNH_ALIGNTO NL_ITEM_ALIGN_SIZE
+#define RTNH_ALIGN(_len) NL_ITEM_ALIGN(_len)
+#define RTNH_HDRLEN ((int)sizeof(struct rtnexthop))
+#define _RTNH_LEN(_nh) ((int)(_nh)->rtnh_len)
+#define _RTNH_ALIGNED_LEN(_nh) RTNH_ALIGN(_RTNH_LEN(_nh))
+#define RTNH_OK(_nh, _len) NL_ITEM_OK(_nh, _len, RTNH_HDRLEN, _RTNH_LEN)
+#define RTNH_NEXT(_nh) ((struct rtnexthop *)((char *)(_nh) + _RTNH_ALIGNED_LEN(_nh)))
+#define RTNH_LENGTH(_len) (RTNH_HDRLEN + (_len))
+#define RTNH_SPACE(_len) RTNH_ALIGN(RTNH_LENGTH(_len))
+#define RTNH_DATA(_nh) ((struct rtattr *)NL_ITEM_DATA(_nh, RTNH_HDRLEN))
+
+struct rtgenmsg {
+ unsigned char rtgen_family;
+};
+
+#endif
diff --git a/sys/netlink/route/route.c b/sys/netlink/route/route.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/route.c
@@ -0,0 +1,972 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Ng Peng Nam Sean
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include "opt_inet.h"
+#include "opt_inet6.h"
+#include "opt_route.h"
+#include <sys/types.h>
+#include <sys/malloc.h>
+#include <sys/rmlock.h>
+#include <sys/socket.h>
+
+#include <net/if.h>
+#include <net/route.h>
+#include <net/route/nhop.h>
+#include <net/route/route_ctl.h>
+#include <net/route/route_var.h>
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_route.h>
+#include <netlink/route/route_var.h>
+
+#define DEBUG_MOD_NAME nl_route
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG);
+
+static unsigned char
+get_rtm_type(const struct nhop_object *nh)
+{
+ int nh_flags = nh->nh_flags;
+
+ /* Use the fact that nhg runtime flags are only NHF_MULTIPATH */
+ if (nh_flags & NHF_BLACKHOLE)
+ return (RTN_BLACKHOLE);
+ else if (nh_flags & NHF_REJECT)
+ return (RTN_PROHIBIT);
+ return (RTN_UNICAST);
+}
+
+static uint8_t
+nl_get_rtm_protocol(const struct nhop_object *nh)
+{
+ if (NH_IS_NHGRP(nh)) {
+ const struct nhgrp_object *nhg = (const struct nhgrp_object *)nh;
+ uint8_t origin = nhgrp_get_origin(nhg);
+ if (origin != RTPROT_UNSPEC)
+ return (origin);
+ nh = nhg->nhops[0];
+ }
+ uint8_t origin = nhop_get_origin(nh);
+ if (origin != RTPROT_UNSPEC)
+ return (origin);
+ /* TODO: remove guesswork once all kernel users fill in origin */
+ int rt_flags = nhop_get_rtflags(nh);
+ if (rt_flags & RTF_PROTO1)
+ return (RTPROT_ZEBRA);
+ if (rt_flags & RTF_STATIC)
+ return (RTPROT_STATIC);
+ return (RTPROT_KERNEL);
+}
+
+static int
+get_rtmsg_type_from_rtsock(int cmd)
+{
+ switch (cmd) {
+ case RTM_ADD:
+ case RTM_CHANGE:
+ case RTM_GET:
+ return NL_RTM_NEWROUTE;
+ case RTM_DELETE:
+ return NL_RTM_DELROUTE;
+ }
+
+ return (0);
+}
+
+/*
+ * fibnum heuristics
+ *
+ * if (dump && rtm_table == 0 && !rta_table) RT_ALL_FIBS
+ * msg rtm_table RTA_TABLE result
+ * RTM_GETROUTE/dump 0 - RT_ALL_FIBS
+ * RTM_GETROUTE/dump 1 - 1
+ * RTM_GETROUTE/get 0 - 0
+ *
+ */
+
+static struct nhop_object *
+rc_get_nhop(const struct rib_cmd_info *rc)
+{
+ return ((rc->rc_cmd == RTM_DELETE) ? rc->rc_nh_old : rc->rc_nh_new);
+}
+
+static void
+dump_rc_nhop_gw(struct nl_writer *nw, const struct nhop_object *nh)
+{
+ int upper_family;
+
+ switch (nhop_get_neigh_family(nh)) {
+ case AF_LINK:
+ /* onlink prefix, skip */
+ break;
+ case AF_INET:
+ nlattr_add(nw, NL_RTA_GATEWAY, 4, &nh->gw4_sa.sin_addr);
+ break;
+ case AF_INET6:
+ upper_family = nhop_get_upper_family(nh);
+ if (upper_family == AF_INET6) {
+ nlattr_add(nw, NL_RTA_GATEWAY, 16, &nh->gw6_sa.sin6_addr);
+ } else if (upper_family == AF_INET) {
+ /* IPv4 over IPv6 */
+ char buf[20];
+ struct rtvia *via = (struct rtvia *)&buf[0];
+ via->rtvia_family = AF_INET6;
+ memcpy(via->rtvia_addr, &nh->gw6_sa.sin6_addr, 16);
+ nlattr_add(nw, NL_RTA_VIA, 17, via);
+ }
+ break;
+ }
+}
+
+static void
+dump_rc_nhop_mtu(struct nl_writer *nw, const struct nhop_object *nh)
+{
+ int nla_len = sizeof(struct nlattr) * 2 + sizeof(uint32_t);
+ struct nlattr *nla = nlmsg_reserve_data(nw, nla_len, struct nlattr);
+
+ if (nla == NULL)
+ return;
+ nla->nla_type = NL_RTA_METRICS;
+ nla->nla_len = nla_len;
+ nla++;
+ nla->nla_type = NL_RTAX_MTU;
+ nla->nla_len = sizeof(struct nlattr) + sizeof(uint32_t);
+ *((uint32_t *)(nla + 1)) = nh->nh_mtu;
+}
+
+static void
+dump_rc_nhg(struct nl_writer *nw, const struct nhgrp_object *nhg, struct rtmsg *rtm)
+{
+ uint32_t uidx = nhgrp_get_uidx(nhg);
+ uint32_t num_nhops;
+ const struct weightened_nhop *wn = nhgrp_get_nhops(nhg, &num_nhops);
+ uint32_t base_rtflags = nhop_get_rtflags(wn[0].nh);
+
+ if (uidx != 0)
+ nlattr_add_u32(nw, NL_RTA_NH_ID, uidx);
+
+ nlattr_add_u32(nw, NL_RTA_RTFLAGS, base_rtflags);
+ int off = nlattr_add_nested(nw, NL_RTA_MULTIPATH);
+ if (off == 0)
+ return;
+
+ for (int i = 0; i < num_nhops; i++) {
+ int nh_off = nlattr_save_offset(nw);
+ struct rtnexthop *rtnh = nlmsg_reserve_object(nw, struct rtnexthop);
+ if (rtnh == NULL)
+ return;
+ rtnh->rtnh_flags = 0;
+ rtnh->rtnh_ifindex = wn[i].nh->nh_ifp->if_index;
+ rtnh->rtnh_hops = wn[i].weight;
+ dump_rc_nhop_gw(nw, wn[i].nh);
+ uint32_t rtflags = nhop_get_rtflags(wn[i].nh);
+ if (rtflags != base_rtflags)
+ nlattr_add_u32(nw, NL_RTA_RTFLAGS, rtflags);
+ if (rtflags & RTF_FIXEDMTU)
+ dump_rc_nhop_mtu(nw, wn[i].nh);
+ rtnh = nlattr_restore_offset(nw, nh_off, struct rtnexthop);
+ /*
+ * nlattr_add() allocates 4-byte aligned storage, no need to aligh
+ * length here
+ * */
+ rtnh->rtnh_len = nlattr_save_offset(nw) - nh_off;
+ }
+ nlattr_set_len(nw, off);
+}
+
+static void
+dump_rc_nhop(struct nl_writer *nw, const struct nhop_object *nh, struct rtmsg *rtm)
+{
+ if (NH_IS_NHGRP(nh)) {
+ dump_rc_nhg(nw, (const struct nhgrp_object *)nh, rtm);
+ return;
+ }
+
+ uint32_t rtflags = nhop_get_rtflags(nh);
+
+ /*
+ * IPv4 over IPv6
+ * ('RTA_VIA', {'family': 10, 'addr': 'fe80::20c:29ff:fe67:2dd'}), ('RTA_OIF', 2),
+ * IPv4 w/ gw
+ * ('RTA_GATEWAY', '172.16.107.131'), ('RTA_OIF', 2)],
+ * Direct route:
+ * ('RTA_OIF', 2)
+ */
+ if (nh->nh_flags & NHF_GATEWAY)
+ dump_rc_nhop_gw(nw, nh);
+
+ uint32_t uidx = nhop_get_uidx(nh);
+ if (uidx != 0)
+ nlattr_add_u32(nw, NL_RTA_NH_ID, uidx);
+ nlattr_add_u32(nw, NL_RTA_KNH_ID, nhop_get_idx(nh));
+ nlattr_add_u32(nw, NL_RTA_RTFLAGS, rtflags);
+
+ if (rtflags & RTF_FIXEDMTU)
+ dump_rc_nhop_mtu(nw, nh);
+ uint32_t nh_expire = nhop_get_expire(nh);
+ if (nh_expire > 0)
+ nlattr_add_u32(nw, NL_RTA_EXPIRES, nh_expire - time_uptime);
+
+ /* In any case, fill outgoing interface */
+ nlattr_add_u32(nw, NL_RTA_OIF, nh->nh_ifp->if_index);
+}
+
+/*
+ * Dumps output from a rib command into an rtmsg
+ */
+
+static int
+dump_px(uint32_t fibnum, const struct nlmsghdr *hdr,
+ const struct rtentry *rt, struct route_nhop_data *rnd,
+ struct nl_writer *nw)
+{
+ struct rtmsg *rtm;
+ int error = 0;
+
+ NET_EPOCH_ASSERT();
+
+ if (!nlmsg_reply(nw, hdr, sizeof(struct rtmsg)))
+ goto enomem;
+
+ int family = rt_get_family(rt);
+ int rtm_off = nlattr_save_offset(nw);
+ rtm = nlmsg_reserve_object(nw, struct rtmsg);
+ rtm->rtm_family = family;
+ rtm->rtm_dst_len = 0;
+ rtm->rtm_src_len = 0;
+ rtm->rtm_tos = 0;
+ if (fibnum < 255)
+ rtm->rtm_table = (unsigned char)fibnum;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ if (!NH_IS_NHGRP(rnd->rnd_nhop)) {
+ rtm->rtm_protocol = nl_get_rtm_protocol(rnd->rnd_nhop);
+ rtm->rtm_type = get_rtm_type(rnd->rnd_nhop);
+ } else {
+ rtm->rtm_protocol = RTPROT_UNSPEC; /* TODO: protocol from nhg? */
+ rtm->rtm_type = RTN_UNICAST;
+ }
+
+ nlattr_add_u32(nw, NL_RTA_TABLE, fibnum);
+
+ int plen = 0;
+ uint32_t scopeid = 0;
+ switch (family) {
+ case AF_INET:
+ {
+ struct in_addr addr;
+ rt_get_inet_prefix_plen(rt, &addr, &plen, &scopeid);
+ nlattr_add(nw, NL_RTA_DST, 4, &addr);
+ break;
+ }
+ case AF_INET6:
+ {
+ struct in6_addr addr;
+ rt_get_inet6_prefix_plen(rt, &addr, &plen, &scopeid);
+ nlattr_add(nw, NL_RTA_DST, 16, &addr);
+ break;
+ }
+ default:
+ FIB_LOG(LOG_NOTICE, fibnum, family, "unsupported rt family: %d", family);
+ error = EAFNOSUPPORT;
+ goto flush;
+ }
+
+ rtm = nlattr_restore_offset(nw, rtm_off, struct rtmsg);
+ if (plen > 0)
+ rtm->rtm_dst_len = plen;
+ dump_rc_nhop(nw, rnd->rnd_nhop, rtm);
+
+ if (nlmsg_end(nw))
+ return (0);
+enomem:
+ error = ENOMEM;
+flush:
+ nlmsg_abort(nw);
+ return (error);
+}
+
+static int
+family_to_group(int family)
+{
+ switch (family) {
+ case AF_INET:
+ return (RTNLGRP_IPV4_ROUTE);
+ case AF_INET6:
+ return (RTNLGRP_IPV6_ROUTE);
+ }
+ return (0);
+}
+
+
+static void
+report_operation(uint32_t fibnum, struct rib_cmd_info *rc,
+ struct nlpcb *nlp, struct nlmsghdr *hdr)
+{
+ struct nl_writer nw;
+
+ uint32_t group_id = family_to_group(rt_get_family(rc->rc_rt));
+ if (nlmsg_get_group_writer(&nw, NLMSG_SMALL, NETLINK_ROUTE, group_id)) {
+ struct route_nhop_data rnd = {
+ .rnd_nhop = rc_get_nhop(rc),
+ .rnd_weight = rc->rc_nh_weight,
+ };
+ hdr->nlmsg_flags &= ~(NLM_F_REPLACE | NLM_F_CREATE);
+ hdr->nlmsg_flags &= ~(NLM_F_EXCL | NLM_F_APPEND);
+ switch (rc->rc_cmd) {
+ case RTM_ADD:
+ hdr->nlmsg_type = NL_RTM_NEWROUTE;
+ hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
+ break;
+ case RTM_CHANGE:
+ hdr->nlmsg_type = NL_RTM_NEWROUTE;
+ hdr->nlmsg_flags |= NLM_F_REPLACE;
+ break;
+ case RTM_DELETE:
+ hdr->nlmsg_type = NL_RTM_DELROUTE;
+ break;
+ }
+ dump_px(fibnum, hdr, rc->rc_rt, &rnd, &nw);
+ nlmsg_flush(&nw);
+ }
+
+ rtsock_callback_p->route_f(fibnum, rc);
+}
+
+struct rta_mpath_nh {
+ struct sockaddr *gw;
+ struct ifnet *ifp;
+ uint8_t rtnh_flags;
+ uint8_t rtnh_weight;
+};
+
+#define _IN(_field) offsetof(struct rtnexthop, _field)
+#define _OUT(_field) offsetof(struct rta_mpath_nh, _field)
+const static struct nlattr_parser nla_p_rtnh[] = {
+ { .type = NL_RTA_GATEWAY, .off = _OUT(gw), .cb = nlattr_get_ip },
+ { .type = NL_RTA_VIA, .off = _OUT(gw), .cb = nlattr_get_ipvia },
+};
+const static struct nlfield_parser nlf_p_rtnh[] = {
+ { .off_in = _IN(rtnh_flags), .off_out = _OUT(rtnh_flags), .cb = nlf_get_u8 },
+ { .off_in = _IN(rtnh_hops), .off_out = _OUT(rtnh_weight), .cb = nlf_get_u8 },
+ { .off_in = _IN(rtnh_ifindex), .off_out = _OUT(ifp), .cb = nlf_get_ifpz },
+};
+#undef _IN
+#undef _OUT
+NL_DECLARE_PARSER(mpath_parser, struct rtnexthop, nlf_p_rtnh, nla_p_rtnh);
+
+struct rta_mpath {
+ int num_nhops;
+ struct rta_mpath_nh nhops[0];
+};
+
+static int
+nlattr_get_multipath(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target)
+{
+ int data_len = nla->nla_len - sizeof(struct nlattr);
+ struct rtnexthop *rtnh;
+
+ int max_nhops = data_len / sizeof(struct rtnexthop);
+
+ struct rta_mpath *mp = npt_alloc(npt, (max_nhops + 2) * sizeof(struct rta_mpath_nh));
+ mp->num_nhops = 0;
+
+ for (rtnh = (struct rtnexthop *)(nla + 1); data_len > 0; ) {
+ struct rta_mpath_nh *mpnh = &mp->nhops[mp->num_nhops++];
+
+ int error = nl_parse_header(rtnh, rtnh->rtnh_len, &mpath_parser,
+ npt, mpnh);
+ if (error != 0) {
+ NLMSG_REPORT_ERR_MSG(npt, "RTA_MULTIPATH: nexhop %d: parse failed",
+ mp->num_nhops - 1);
+ return (error);
+ }
+
+ int len = NL_ITEM_ALIGN(rtnh->rtnh_len);
+ data_len -= len;
+ rtnh = (struct rtnexthop *)((char *)rtnh + len);
+ }
+ if (data_len != 0 || mp->num_nhops == 0) {
+ NLMSG_REPORT_ERR_MSG(npt, "invalid RTA_MULTIPATH attr");
+ return (EINVAL);
+ }
+
+ *((struct rta_mpath **)target) = mp;
+ return (0);
+}
+
+
+struct nl_parsed_route {
+ struct sockaddr *rta_dst;
+ struct sockaddr *rta_gw;
+ struct ifnet *rta_oif;
+ struct rta_mpath *rta_multipath;
+ uint32_t rta_table;
+ uint32_t rta_rtflags;
+ uint32_t rta_nh_id;
+ uint32_t rtax_mtu;
+ uint8_t rtm_family;
+ uint8_t rtm_dst_len;
+};
+
+#define _IN(_field) offsetof(struct rtmsg, _field)
+#define _OUT(_field) offsetof(struct nl_parsed_route, _field)
+static struct nlattr_parser nla_p_rtmetrics[] = {
+ { .type = NL_RTAX_MTU, .off = _OUT(rtax_mtu), .cb = nlattr_get_uint32 },
+};
+NL_DECLARE_ATTR_PARSER(metrics_parser, nla_p_rtmetrics);
+
+static const struct nlattr_parser nla_p_rtmsg[] = {
+ { .type = NL_RTA_DST, .off = _OUT(rta_dst), .cb = nlattr_get_ip },
+ { .type = NL_RTA_OIF, .off = _OUT(rta_oif), .cb = nlattr_get_ifp },
+ { .type = NL_RTA_GATEWAY, .off = _OUT(rta_gw), .cb = nlattr_get_ip },
+ { .type = NL_RTA_METRICS, .arg = &metrics_parser, .cb = nlattr_get_nested },
+ { .type = NL_RTA_MULTIPATH, .off = _OUT(rta_multipath), .cb = nlattr_get_multipath },
+ { .type = NL_RTA_RTFLAGS, .off = _OUT(rta_rtflags), .cb = nlattr_get_uint32 },
+ { .type = NL_RTA_TABLE, .off = _OUT(rta_table), .cb = nlattr_get_uint32 },
+ { .type = NL_RTA_VIA, .off = _OUT(rta_gw), .cb = nlattr_get_ipvia },
+ { .type = NL_RTA_NH_ID, .off = _OUT(rta_nh_id), .cb = nlattr_get_uint32 },
+};
+
+static const struct nlfield_parser nlf_p_rtmsg[] = {
+ {.off_in = _IN(rtm_family), .off_out = _OUT(rtm_family), .cb = nlf_get_u8 },
+ {.off_in = _IN(rtm_dst_len), .off_out = _OUT(rtm_dst_len), .cb = nlf_get_u8 },
+};
+#undef _IN
+#undef _OUT
+NL_DECLARE_PARSER(rtm_parser, struct rtmsg, nlf_p_rtmsg, nla_p_rtmsg);
+
+struct netlink_walkargs {
+ struct nl_writer *nw;
+ struct route_nhop_data rnd;
+ struct nlmsghdr hdr;
+ struct nlpcb *nlp;
+ uint32_t fibnum;
+ int family;
+ int error;
+ int count;
+ int dumped;
+ int dumped_tables;
+};
+
+static int
+dump_rtentry(struct rtentry *rt, void *_arg)
+{
+ struct netlink_walkargs *wa = (struct netlink_walkargs *)_arg;
+ int error;
+
+ wa->count++;
+ if (wa->error != 0)
+ return (0);
+ wa->dumped++;
+
+ rt_get_rnd(rt, &wa->rnd);
+
+ error = dump_px(wa->fibnum, &wa->hdr, rt, &wa->rnd, wa->nw);
+
+ IF_DEBUG_LEVEL(LOG_DEBUG3) {
+ char rtbuf[INET6_ADDRSTRLEN + 5];
+ FIB_LOG(LOG_DEBUG3, wa->fibnum, wa->family,
+ "Dump %s, offset %u, error %d",
+ rt_print_buf(rt, rtbuf, sizeof(rtbuf)),
+ wa->nw->offset, error);
+ }
+ wa->error = error;
+
+ return (0);
+}
+
+static void
+dump_rtable_one(struct netlink_walkargs *wa, uint32_t fibnum, int family)
+{
+ FIB_LOG(LOG_DEBUG2, fibnum, family, "Start dump");
+ wa->count = 0;
+ wa->dumped = 0;
+
+ rib_walk(fibnum, family, false, dump_rtentry, wa);
+
+ wa->dumped_tables++;
+
+ FIB_LOG(LOG_DEBUG2, fibnum, family, "End dump, iterated %d dumped %d",
+ wa->count, wa->dumped);
+ NL_LOG(LOG_DEBUG2, "Current offset: %d", wa->nw->offset);
+}
+
+static int
+dump_rtable_fib(struct netlink_walkargs *wa, uint32_t fibnum, int family)
+{
+ wa->fibnum = fibnum;
+
+ if (family == AF_UNSPEC) {
+ for (int i = 0; i < AF_MAX; i++) {
+ if (rt_tables_get_rnh(fibnum, i) != 0) {
+ wa->family = i;
+ dump_rtable_one(wa, fibnum, i);
+ if (wa->error != 0)
+ break;
+ }
+ }
+ } else {
+ if (rt_tables_get_rnh(fibnum, family) != 0) {
+ wa->family = family;
+ dump_rtable_one(wa, fibnum, family);
+ }
+ }
+
+ return (wa->error);
+}
+
+static int
+handle_rtm_getroute(struct nlpcb *nlp, struct nl_parsed_route *attrs,
+ struct nlmsghdr *hdr, struct nl_pstate *npt)
+{
+ RIB_RLOCK_TRACKER;
+ struct rib_head *rnh;
+ struct rtentry *rt;
+ uint32_t fibnum = attrs->rta_table;
+ sa_family_t family = attrs->rtm_family;
+
+ if (attrs->rta_dst == NULL) {
+ NLMSG_REPORT_ERR_MSG(npt, "No RTA_DST supplied");
+ return (EINVAL);
+ }
+
+ FIB_LOG(LOG_DEBUG, fibnum, family, "getroute called");
+
+ rnh = rt_tables_get_rnh(fibnum, family);
+ if (rnh == NULL)
+ return (EAFNOSUPPORT);
+
+ RIB_RLOCK(rnh);
+
+ rt = (struct rtentry *)rnh->rnh_matchaddr(attrs->rta_dst, &rnh->head);
+ if (rt == NULL) {
+ RIB_RUNLOCK(rnh);
+ return (ESRCH);
+ }
+
+ struct route_nhop_data rnd;
+ rt_get_rnd(rt, &rnd);
+ rnd.rnd_nhop = nhop_select_func(rnd.rnd_nhop, 0);
+
+ RIB_RUNLOCK(rnh);
+
+ IF_DEBUG_LEVEL(LOG_DEBUG2) {
+ char rtbuf[NHOP_PRINT_BUFSIZE] __unused, nhbuf[NHOP_PRINT_BUFSIZE] __unused;
+ FIB_LOG(LOG_DEBUG2, fibnum, family, "getroute completed: got %s for %s",
+ nhop_print_buf_any(rnd.rnd_nhop, nhbuf, sizeof(nhbuf)),
+ rt_print_buf(rt, rtbuf, sizeof(rtbuf)));
+ }
+
+ hdr->nlmsg_type = NL_RTM_NEWROUTE;
+ dump_px(fibnum, hdr, rt, &rnd, npt->nw);
+
+ return (0);
+}
+
+static int
+handle_rtm_dump(struct nlpcb *nlp, uint32_t fibnum, int family,
+ struct nlmsghdr *hdr, struct nl_writer *nw)
+{
+ struct netlink_walkargs wa = {
+ .nlp = nlp,
+ .nw = nw,
+ .hdr.nlmsg_pid = hdr->nlmsg_pid,
+ .hdr.nlmsg_seq = hdr->nlmsg_seq,
+ .hdr.nlmsg_type = NL_RTM_NEWROUTE,
+ .hdr.nlmsg_flags = hdr->nlmsg_flags | NLM_F_MULTI,
+ };
+
+ if (fibnum == RT_TABLE_UNSPEC) {
+ for (int i = 0; i < V_rt_numfibs; i++) {
+ dump_rtable_fib(&wa, fibnum, family);
+ if (wa.error != 0)
+ break;
+ }
+ } else
+ dump_rtable_fib(&wa, fibnum, family);
+
+ if (wa.error == 0 && wa.dumped_tables == 0) {
+ FIB_LOG(LOG_DEBUG, fibnum, family, "incorrect fibnum/family");
+ wa.error = ESRCH;
+ // How do we propagate it?
+ }
+
+ if (!nlmsg_end_dump(wa.nw, wa.error, &wa.hdr)) {
+ NL_LOG(LOG_DEBUG, "Unable to finalize the dump");
+ return (ENOMEM);
+ }
+
+ return (wa.error);
+}
+
+static struct nhop_object *
+finalize_nhop(struct nhop_object *nh, int *perror)
+{
+ /*
+ * The following MUST be filled:
+ * nh_ifp, nh_ifa, nh_gw
+ */
+ if (nh->gw_sa.sa_family == 0) {
+ /*
+ * Empty gateway. Can be direct route with RTA_OIF set.
+ */
+ if (nh->nh_ifp != NULL)
+ nhop_set_direct_gw(nh, nh->nh_ifp);
+ else {
+ NL_LOG(LOG_DEBUG, "empty gateway and interface, skipping");
+ *perror = EINVAL;
+ return (NULL);
+ }
+ /* Both nh_ifp and gateway are set */
+ } else {
+ /* Gateway is set up, we can derive ifp if not set */
+ if (nh->nh_ifp == NULL) {
+ struct ifaddr *ifa = ifa_ifwithnet(&nh->gw_sa, 1, nhop_get_fibnum(nh));
+ if (ifa == NULL) {
+ NL_LOG(LOG_DEBUG, "Unable to determine ifp, skipping");
+ *perror = EINVAL;
+ return (NULL);
+ }
+ nhop_set_transmit_ifp(nh, ifa->ifa_ifp);
+ }
+ }
+ /* Both nh_ifp and gateway are set */
+ if (nh->nh_ifa == NULL) {
+ struct ifaddr *ifa = ifaof_ifpforaddr(&nh->gw_sa, nh->nh_ifp);
+ if (ifa == NULL) {
+ NL_LOG(LOG_DEBUG, "Unable to determine ifa, skipping");
+ *perror = EINVAL;
+ return (NULL);
+ }
+ nhop_set_src(nh, ifa);
+ }
+
+ return (nhop_get_nhop(nh, perror));
+}
+
+static int
+get_pxflag(const struct nl_parsed_route *attrs)
+{
+ int pxflag = 0;
+ switch (attrs->rtm_family) {
+ case AF_INET:
+ if (attrs->rtm_dst_len == 32)
+ pxflag = NHF_HOST;
+ else if (attrs->rtm_dst_len == 0)
+ pxflag = NHF_DEFAULT;
+ break;
+ case AF_INET6:
+ if (attrs->rtm_dst_len == 32)
+ pxflag = NHF_HOST;
+ else if (attrs->rtm_dst_len == 0)
+ pxflag = NHF_DEFAULT;
+ break;
+ }
+
+ return (pxflag);
+}
+
+static int
+get_op_flags(int nlm_flags)
+{
+ int op_flags = 0;
+
+ op_flags |= (nlm_flags & NLM_F_REPLACE) ? RTM_F_REPLACE : 0;
+ op_flags |= (nlm_flags & NLM_F_EXCL) ? RTM_F_EXCL : 0;
+ op_flags |= (nlm_flags & NLM_F_CREATE) ? RTM_F_CREATE : 0;
+ op_flags |= (nlm_flags & NLM_F_APPEND) ? RTM_F_APPEND : 0;
+
+ return (op_flags);
+}
+
+static int
+create_nexthop_one(struct nl_parsed_route *attrs, struct rta_mpath_nh *mpnh,
+ struct nl_pstate *npt, struct nhop_object **pnh)
+{
+ int error;
+
+ if (mpnh->gw == NULL)
+ return (EINVAL);
+
+ struct nhop_object *nh = nhop_alloc(attrs->rta_table, attrs->rtm_family);
+ if (nh == NULL)
+ return (ENOMEM);
+
+ nhop_set_gw(nh, mpnh->gw, true);
+ if (mpnh->ifp != NULL)
+ nhop_set_transmit_ifp(nh, mpnh->ifp);
+ nhop_set_rtflags(nh, attrs->rta_rtflags);
+
+ *pnh = finalize_nhop(nh, &error);
+
+ return (error);
+}
+
+static struct nhop_object *
+create_nexthop_from_attrs(struct nl_parsed_route *attrs,
+ struct nl_pstate *npt, int *perror)
+{
+ struct nhop_object *nh;
+ int error = 0;
+
+ if (attrs->rta_multipath != NULL) {
+ /* Multipath w/o explicit nexthops */
+ int num_nhops = attrs->rta_multipath->num_nhops;
+ struct weightened_nhop *wn = npt_alloc(npt, sizeof(*wn) * num_nhops);
+ nh = NULL;
+
+ for (int i = 0; i < num_nhops; i++) {
+ struct rta_mpath_nh *mpnh = &attrs->rta_multipath->nhops[i];
+
+ error = create_nexthop_one(attrs, mpnh, npt, &wn[i].nh);
+ if (error != 0) {
+ for (int j = 0; j < i; j++)
+ nhop_free(wn[j].nh);
+ break;
+ }
+ wn[i].weight = mpnh->rtnh_weight > 0 ? mpnh->rtnh_weight : 1;
+ }
+ if (error == 0) {
+ struct rib_head *rh = nhop_get_rh(wn[0].nh);
+
+ error = nhgrp_get_group(rh, wn, num_nhops, 0,
+ (struct nhgrp_object **)&nh);
+
+ for (int i = 0; i < num_nhops; i++)
+ nhop_free(wn[i].nh);
+ }
+ *perror = error;
+ } else {
+ nh = nhop_alloc(attrs->rta_table, attrs->rtm_family);
+ if (nh == NULL) {
+ *perror = ENOMEM;
+ return (NULL);
+ }
+ if (attrs->rta_gw != NULL)
+ nhop_set_gw(nh, attrs->rta_gw, true);
+ if (attrs->rta_oif != NULL)
+ nhop_set_transmit_ifp(nh, attrs->rta_oif);
+ if (attrs->rtax_mtu != 0)
+ nhop_set_mtu(nh, attrs->rtax_mtu, true);
+ if (attrs->rta_rtflags & RTF_BROADCAST)
+ nhop_set_broadcast(nh, true);
+ if (attrs->rta_rtflags & RTF_BLACKHOLE)
+ nhop_set_blackhole(nh, NHF_BLACKHOLE);
+ if (attrs->rta_rtflags & RTF_REJECT)
+ nhop_set_blackhole(nh, NHF_REJECT);
+ nhop_set_rtflags(nh, attrs->rta_rtflags);
+ nh = finalize_nhop(nh, perror);
+ }
+
+ return (nh);
+}
+
+static int
+rtnl_handle_newroute(struct nlmsghdr *hdr, struct nlpcb *nlp,
+ struct nl_pstate *npt)
+{
+ struct rib_cmd_info rc = {};
+ struct nhop_object *nh = NULL;
+ int error;
+
+ struct nl_parsed_route attrs = {};
+ error = nl_parse_nlmsg(hdr, &rtm_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ /* Check if we have enough data */
+ if (attrs.rta_dst == NULL) {
+ NL_LOG(LOG_DEBUG, "missing RTA_DST");
+ return (EINVAL);
+ }
+
+ if (attrs.rta_nh_id != 0) {
+ /* Referenced uindex */
+ int pxflag = get_pxflag(&attrs);
+ nh = nl_find_nhop(attrs.rta_table, attrs.rtm_family, attrs.rta_nh_id,
+ pxflag, &error);
+ if (error != 0)
+ return (error);
+ } else {
+ nh = create_nexthop_from_attrs(&attrs, npt, &error);
+ if (error != 0) {
+ NL_LOG(LOG_DEBUG, "Error creating nexthop");
+ return (error);
+ }
+ }
+
+ int weight = NH_IS_NHGRP(nh) ? 0 : RT_DEFAULT_WEIGHT;
+ struct route_nhop_data rnd = { .rnd_nhop = nh, .rnd_weight = weight };
+ int op_flags = get_op_flags(hdr->nlmsg_flags);
+
+ error = rib_add_route_px(attrs.rta_table, attrs.rta_dst, attrs.rtm_dst_len,
+ &rnd, op_flags, &rc);
+ if (error == 0)
+ report_operation(attrs.rta_table, &rc, nlp, hdr);
+ return (error);
+}
+
+static int
+path_match_func(const struct rtentry *rt, const struct nhop_object *nh, void *_data)
+{
+ struct nl_parsed_route *attrs = (struct nl_parsed_route *)_data;
+
+ if ((attrs->rta_gw != NULL) && !rib_match_gw(rt, nh, attrs->rta_gw))
+ return (0);
+
+ if ((attrs->rta_oif != NULL) && (attrs->rta_oif != nh->nh_ifp))
+ return (0);
+
+ return (1);
+}
+
+static int
+rtnl_handle_delroute(struct nlmsghdr *hdr, struct nlpcb *nlp,
+ struct nl_pstate *npt)
+{
+ struct rib_cmd_info rc;
+ int error;
+
+ struct nl_parsed_route attrs = {};
+ error = nl_parse_nlmsg(hdr, &rtm_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ if (attrs.rta_dst == NULL) {
+ NLMSG_REPORT_ERR_MSG(npt, "RTA_DST is not set");
+ return (ESRCH);
+ }
+
+ error = rib_del_route_px(attrs.rta_table, attrs.rta_dst,
+ attrs.rtm_dst_len, path_match_func, &attrs, 0, &rc);
+ if (error == 0)
+ report_operation(attrs.rta_table, &rc, nlp, hdr);
+ return (error);
+}
+
+static int
+rtnl_handle_getroute(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt)
+{
+ int error;
+
+ struct nl_parsed_route attrs = {};
+ error = nl_parse_nlmsg(hdr, &rtm_parser, npt, &attrs);
+ if (error != 0)
+ return (error);
+
+ if (hdr->nlmsg_flags & NLM_F_DUMP)
+ error = handle_rtm_dump(nlp, attrs.rta_table, attrs.rtm_family, hdr, npt->nw);
+ else
+ error = handle_rtm_getroute(nlp, &attrs, hdr, npt);
+
+ return (error);
+}
+
+void
+rtnl_handle_route_event(uint32_t fibnum, const struct rib_cmd_info *rc)
+{
+ int family, nlm_flags = 0;
+
+ struct nl_writer nw;
+
+ family = rt_get_family(rc->rc_rt);
+
+ /* XXX: check if there are active listeners first */
+
+ /* TODO: consider passing PID/type/seq */
+ switch (rc->rc_cmd) {
+ case RTM_ADD:
+ nlm_flags = NLM_F_EXCL | NLM_F_CREATE;
+ break;
+ case RTM_CHANGE:
+ nlm_flags = NLM_F_REPLACE;
+ break;
+ case RTM_DELETE:
+ nlm_flags = 0;
+ break;
+ }
+ IF_DEBUG_LEVEL(LOG_DEBUG2) {
+ char rtbuf[NHOP_PRINT_BUFSIZE] __unused;
+ FIB_LOG(LOG_DEBUG2, fibnum, family,
+ "received event %s for %s / nlm_flags=%X",
+ rib_print_cmd(rc->rc_cmd),
+ rt_print_buf(rc->rc_rt, rtbuf, sizeof(rtbuf)),
+ nlm_flags);
+ }
+
+ struct nlmsghdr hdr = {
+ .nlmsg_flags = nlm_flags,
+ .nlmsg_type = get_rtmsg_type_from_rtsock(rc->rc_cmd),
+ };
+
+ struct route_nhop_data rnd = {
+ .rnd_nhop = rc_get_nhop(rc),
+ .rnd_weight = rc->rc_nh_weight,
+ };
+
+ uint32_t group_id = family_to_group(family);
+ if (!nlmsg_get_group_writer(&nw, NLMSG_SMALL, NETLINK_ROUTE, group_id)) {
+ NL_LOG(LOG_DEBUG, "error allocating event buffer");
+ return;
+ }
+
+ dump_px(fibnum, &hdr, rc->rc_rt, &rnd, &nw);
+ nlmsg_flush(&nw);
+}
+
+static const struct rtnl_cmd_handler cmd_handlers[] = {
+ {
+ .cmd = NL_RTM_GETROUTE,
+ .name = "RTM_GETROUTE",
+ .cb = &rtnl_handle_getroute,
+ },
+ {
+ .cmd = NL_RTM_DELROUTE,
+ .name = "RTM_DELROUTE",
+ .cb = &rtnl_handle_delroute,
+ .priv = PRIV_NET_ROUTE,
+ },
+ {
+ .cmd = NL_RTM_NEWROUTE,
+ .name = "RTM_NEWROUTE",
+ .cb = &rtnl_handle_newroute,
+ .priv = PRIV_NET_ROUTE,
+ }
+};
+
+static const struct nlhdr_parser *all_parsers[] = {&mpath_parser, &metrics_parser, &rtm_parser};
+
+void
+rtnl_routes_init()
+{
+ NL_VERIFY_PARSERS(all_parsers);
+ rtnl_register_messages(cmd_handlers, NL_ARRAY_LEN(cmd_handlers));
+}
diff --git a/sys/netlink/route/route_var.h b/sys/netlink/route/route_var.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/route/route_var.h
@@ -0,0 +1,101 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * This file contains definitions shared among NETLINK_ROUTE family
+ */
+#ifndef _NETLINK_ROUTE_ROUTE_VAR_H_
+#define _NETLINK_ROUTE_ROUTE_VAR_H_
+
+#include <sys/priv.h> /* values for priv_check */
+
+struct nlmsghdr;
+struct nlpcb;
+struct nl_pstate;
+
+typedef int rtnl_msg_cb_f(struct nlmsghdr *hdr, struct nlpcb *nlp,
+ struct nl_pstate *npt);
+
+struct rtnl_cmd_handler {
+ int cmd;
+ const char *name;
+ rtnl_msg_cb_f *cb;
+ int priv;
+ int flags;
+};
+
+#define RTNL_F_NOEPOCH 0x01
+
+bool rtnl_register_messages(const struct rtnl_cmd_handler *handlers, int count);
+
+/* route.c */
+struct rib_cmd_info;
+void rtnl_handle_route_event(uint32_t fibnum, const struct rib_cmd_info *rc);
+void rtnl_routes_init(void);
+
+/* neigh.c */
+void rtnl_neighs_init(void);
+void rtnl_neighs_destroy(void);
+
+/* iface.c */
+struct nl_parsed_link {
+ char *ifla_group;
+ char *ifla_ifname;
+ char *ifla_cloner;
+ struct nlattr *ifla_idata;
+ unsigned short ifi_type;
+ int ifi_index;
+ uint32_t ifla_mtu;
+};
+
+typedef int rtnl_iface_create_f(struct nl_parsed_link *lattrs, struct nlpcb *nlp,
+ struct nl_pstate *npt);
+typedef int rtnl_iface_modify_f(struct nl_parsed_link *lattrs, struct nlpcb *nlp,
+ struct nl_pstate *npt);
+
+struct nl_cloner {
+ const char *name;
+ rtnl_iface_create_f *create_f;
+ rtnl_iface_modify_f *modify_f;
+ SLIST_ENTRY(nl_cloner) next;
+};
+
+void rtnl_ifaces_init(void);
+void rtnl_ifaces_destroy(void);
+void rtnl_iface_add_cloner(struct nl_cloner *cloner);
+void rtnl_iface_del_cloner(struct nl_cloner *cloner);
+
+/* iface_drivers.c */
+void rtnl_iface_drivers_register(void);
+
+/* nexthop.c */
+void rtnl_nexthops_init(void);
+struct nhop_object *nl_find_nhop(uint32_t fibnum, int family,
+ uint32_t uidx, int nh_flags, int *perror);
+
+
+#endif
diff --git a/tests/sys/net/routing/netlink.py b/tests/sys/net/routing/netlink.py
new file mode 100644
--- /dev/null
+++ b/tests/sys/net/routing/netlink.py
@@ -0,0 +1,1167 @@
+#!/usr/local/bin/python3
+
+from ctypes import *
+import socket
+import os
+import sys
+import unittest
+import struct
+
+from enum import Enum, auto
+
+from typing import List, Callable, Dict, NamedTuple, Optional
+
+
+def roundup2(val: int, num: int) -> int:
+ if val % num:
+ return (val | (num - 1)) + 1
+ else:
+ return val
+
+
+def align4(val: int) -> int:
+ return roundup2(val, 4)
+
+
+class SockaddrNl(Structure):
+ _fields_ = [
+ ("nl_len", c_ubyte),
+ ("nl_family", c_ubyte),
+ ("nl_pad", c_ushort),
+ ("nl_pid", c_uint),
+ ("nl_groups", c_uint),
+ ]
+
+
+class Nlmsghdr(Structure):
+ _fields_ = [
+ ("nlmsg_len", c_uint),
+ ("nlmsg_type", c_ushort),
+ ("nlmsg_flags", c_ushort),
+ ("nlmsg_seq", c_uint),
+ ("nlmsg_pid", c_uint),
+ ]
+
+
+class Nlmsgerr(Structure):
+ _fields_ = [
+ ("error", c_int),
+ ("msg", Nlmsghdr),
+ ]
+
+
+class NlErrattrType(Enum):
+ NLMSGERR_ATTR_UNUSED = 0
+ NLMSGERR_ATTR_MSG = auto()
+ NLMSGERR_ATTR_OFFS = auto()
+ NLMSGERR_ATTR_COOKIE = auto()
+ NLMSGERR_ATTR_POLICY = auto()
+
+class RtattrType(Enum):
+ RTA_UNSPEC = 0
+ RTA_DST = auto()
+ RTA_SRC = auto()
+ RTA_IIF = auto()
+ RTA_OIF = auto()
+ RTA_GATEWAY = auto()
+ RTA_PRIORITY = auto()
+ RTA_PREFSRC = auto()
+ RTA_METRICS = auto()
+ RTA_MULTIPATH = auto()
+ RTA_PROTOINFO = auto()
+ RTA_FLOW = auto()
+ RTA_CACHEINFO = auto()
+ RTA_SESSION = auto()
+ RTA_MP_ALGO = auto()
+ RTA_TABLE = auto()
+ RTA_MARK = auto()
+ RTA_MFC_STATS = auto()
+ RTA_VIA = auto()
+ RTA_NEWDST = auto()
+ RTA_PREF = auto()
+ RTA_ENCAP_TYPE = auto()
+ RTA_ENCAP = auto()
+ RTA_EXPIRES = auto()
+ RTA_PAD = auto()
+ RTA_UID = auto()
+ RTA_TTL_PROPAGATE = auto()
+ RTA_IP_PROTO = auto()
+ RTA_SPORT = auto()
+ RTA_DPORT = auto()
+ RTA_NH_ID = auto()
+
+
+class NlMsgType(Enum):
+ NLMSG_NOOP = 1
+ NLMSG_ERROR = 2
+ NLMSG_DONE = 3
+ NLMSG_OVERRUN = 4
+
+
+class NlRtMsgType(Enum):
+ RTM_NEWLINK = 16
+ RTM_DELLINK = 17
+ RTM_GETLINK = 18
+ RTM_SETLINK = 19
+ RTM_NEWADDR = 20
+ RTM_DELADDR = 21
+ RTM_GETADDR = 22
+ RTM_NEWROUTE = 24
+ RTM_DELROUTE = 25
+ RTM_GETROUTE = 26
+ RTM_NEWNEIGH = 28
+ RTM_DELNEIGH = 27
+ RTM_GETNEIGH = 28
+ RTM_NEWRULE = 32
+ RTM_DELRULE = 33
+ RTM_GETRULE = 34
+ RTM_NEWQDISC = 36
+ RTM_DELQDISC = 37
+ RTM_GETQDISC = 38
+ RTM_NEWTCLASS = 40
+ RTM_DELTCLASS = 41
+ RTM_GETTCLASS = 42
+ RTM_NEWTFILTER = 44
+ RTM_DELTFILTER = 45
+ RTM_GETTFILTER = 46
+ RTM_NEWACTION = 48
+ RTM_DELACTION = 49
+ RTM_GETACTION = 50
+ RTM_NEWPREFIX = 52
+ RTM_GETMULTICAST = 58
+ RTM_GETANYCAST = 62
+ RTM_NEWNEIGHTBL = 64
+ RTM_GETNEIGHTBL = 66
+ RTM_SETNEIGHTBL = 67
+ RTM_NEWNDUSEROPT = 68
+ RTM_NEWADDRLABEL = 72
+ RTM_DELADDRLABEL = 73
+ RTM_GETADDRLABEL = 74
+ RTM_GETDCB = 78
+ RTM_SETDCB = 79
+ RTM_NEWNETCONF = 80
+ RTM_GETNETCONF = 82
+ RTM_NEWMDB = 84
+ RTM_DELMDB = 85
+ RTM_GETMDB = 86
+ RTM_NEWNSID = 88
+ RTM_DELNSID = 89
+ RTM_GETNSID = 90
+ RTM_NEWSTATS = 92
+ RTM_GETSTATS = 94
+
+
+class RtAttr(Structure):
+ _fields_ = [
+ ("rta_len", c_ushort),
+ ("rta_type", c_ushort),
+ ]
+
+
+class RtMsgHdr(Structure):
+ _fields_ = [
+ ("rtm_family", c_ubyte),
+ ("rtm_dst_len", c_ubyte),
+ ("rtm_src_len", c_ubyte),
+ ("rtm_tos", c_ubyte),
+ ("rtm_table", c_ubyte),
+ ("rtm_protocol", c_ubyte),
+ ("rtm_scope", c_ubyte),
+ ("rtm_type", c_ubyte),
+ ("rtm_flags", c_uint),
+ ]
+
+
+class RtMsgFlags(Enum):
+ RTM_F_NOTIFY = 0x100
+ RTM_F_CLONED = 0x200
+ RTM_F_EQUALIZE = 0x400
+ RTM_F_PREFIX = 0x800
+ RTM_F_LOOKUP_TABLE = 0x1000
+ RTM_F_FIB_MATCH = 0x2000
+ RTM_F_OFFLOAD = 0x4000
+ RTM_F_TRAP = 0x8000
+ RTM_F_OFFLOAD_FAILED = 0x20000000
+
+
+class AddressFamilyLinux(Enum):
+ AF_INET = socket.AF_INET
+ AF_INET6 = socket.AF_INET6
+ AF_NETLINK = 16
+
+
+class AddressFamilyBsd(Enum):
+ AF_INET = socket.AF_INET
+ AF_INET6 = socket.AF_INET6
+ AF_NETLINK = 38
+
+
+class NlmBaseFlags(Enum):
+ NLM_F_REQUEST = 0x01
+ NLM_F_MULTI = 0x02
+ NLM_F_ACK = 0x04
+ NLM_F_ECHO = 0x08
+ NLM_F_DUMP_INTR = 0x10
+ NLM_F_DUMP_FILTERED = 0x20
+
+# XXX: in python3.8 it is possible to
+# class NlmGetFlags(Enum, NlmBaseFlags):
+
+
+class NlmGetFlags(Enum):
+ NLM_F_ROOT = 0x100
+ NLM_F_MATCH = 0x200
+ NLM_F_ATOMIC = 0x400
+
+
+class NlmNewFlags(Enum):
+ NLM_F_REPLACE = 0x100
+ NLM_F_EXCL = 0x200
+ NLM_F_CREATE = 0x400
+ NLM_F_APPEND = 0x800
+
+
+class NlmDeleteFlags(Enum):
+ NLM_F_NONREC = 0x100
+
+
+class NlmAckFlags(Enum):
+ NLM_F_CAPPED = 0x100
+ NLM_F_ACK_TLVS = 0x200
+
+
+class RtScope(Enum):
+ RT_SCOPE_UNIVERSE = 0
+ RT_SCOPE_SITE = 200
+ RT_SCOPE_LINK = 253
+ RT_SCOPE_HOST = 254
+ RT_SCOPE_NOWHERE = 255
+
+
+class RtType(Enum):
+ RTN_UNSPEC = 0
+ RTN_UNICAST = auto()
+ RTN_LOCAL = auto()
+ RTN_BROADCAST = auto()
+ RTN_ANYCAST = auto()
+ RTN_MULTICAST = auto()
+ RTN_BLACKHOLE = auto()
+ RTN_UNREACHABLE = auto()
+ RTN_PROHIBIT = auto()
+ RTN_THROW = auto()
+ RTN_NAT = auto()
+ RTN_XRESOLVE = auto()
+
+
+class RtProto(Enum):
+ RTPROT_UNSPEC = 0
+ RTPROT_REDIRECT = 1
+ RTPROT_KERNEL = 2
+ RTPROT_BOOT = 3
+ RTPROT_STATIC = 4
+ RTPROT_GATED = 8
+ RTPROT_RA = 9
+ RTPROT_MRT = 10
+ RTPROT_ZEBRA = 11
+ RTPROT_BIRD = 12
+ RTPROT_DNROUTED = 13
+ RTPROT_XORP = 14
+ RTPROT_NTK = 15
+ RTPROT_DHCP = 16
+ RTPROT_MROUTED = 17
+ RTPROT_KEEPALIVED = 18
+ RTPROT_BABEL = 42
+ RTPROT_OPENR = 99
+ RTPROT_BGP = 186
+ RTPROT_ISIS = 187
+ RTPROT_OSPF = 188
+ RTPROT_RIP = 189
+ RTPROT_EIGRP = 192
+
+
+class NlRtaxType(Enum):
+ RTAX_UNSPEC = 0
+ RTAX_LOCK = auto()
+ RTAX_MTU = auto()
+ RTAX_WINDOW = auto()
+ RTAX_RTT = auto()
+ RTAX_RTTVAR = auto()
+ RTAX_SSTHRESH = auto()
+ RTAX_CWND = auto()
+ RTAX_ADVMSS = auto()
+ RTAX_REORDERING = auto()
+ RTAX_HOPLIMIT = auto()
+ RTAX_INITCWND = auto()
+ RTAX_FEATURES = auto()
+ RTAX_RTO_MIN = auto()
+ RTAX_INITRWND = auto()
+ RTAX_QUICKACK = auto()
+ RTAX_CC_ALGO = auto()
+ RTAX_FASTOPEN_NO_COOKIE = auto()
+
+
+class NlRtGroup(Enum):
+ RTNLGRP_NONE = 0
+ RTNLGRP_LINK = auto()
+ RTNLGRP_NOTIFY = auto()
+ RTNLGRP_NEIGH = auto()
+ RTNLGRP_TC = auto()
+ RTNLGRP_IPV4_IFADDR = auto()
+ RTNLGRP_IPV4_MROUTE = auto()
+ RTNLGRP_IPV4_ROUTE = auto()
+ RTNLGRP_IPV4_RULE = auto()
+ RTNLGRP_IPV6_IFADDR = auto()
+ RTNLGRP_IPV6_MROUTE = auto()
+ RTNLGRP_IPV6_ROUTE = auto()
+ RTNLGRP_IPV6_IFINFO = auto()
+ RTNLGRP_DECnet_IFADDR = auto()
+ RTNLGRP_NOP2 = auto()
+ RTNLGRP_DECnet_ROUTE = auto()
+ RTNLGRP_DECnet_RULE = auto()
+ RTNLGRP_NOP4 = auto()
+ RTNLGRP_IPV6_PREFIX = auto()
+ RTNLGRP_IPV6_RULE = auto()
+ RTNLGRP_ND_USEROPT = auto()
+ RTNLGRP_PHONET_IFADDR = auto()
+ RTNLGRP_PHONET_ROUTE = auto()
+ RTNLGRP_DCB = auto()
+ RTNLGRP_IPV4_NETCONF = auto()
+ RTNLGRP_IPV6_NETCONF = auto()
+ RTNLGRP_MDB = auto()
+ RTNLGRP_MPLS_ROUTE = auto()
+ RTNLGRP_NSID = auto()
+ RTNLGRP_MPLS_NETCONF = auto()
+ RTNLGRP_IPV4_MROUTE_R = auto()
+ RTNLGRP_IPV6_MROUTE_R = auto()
+ RTNLGRP_NEXTHOP = auto()
+ RTNLGRP_BRVLAN = auto()
+
+
+class IfinfoMsg(Structure):
+ _fields_ = [
+ ("ifi_family", c_ubyte),
+ ("__ifi_pad", c_ubyte),
+ ("ifi_type", c_ushort),
+ ("ifi_index", c_int),
+ ("ifi_flags", c_uint),
+ ("ifi_change", c_uint),
+ ]
+
+
+class IflattrType(Enum):
+ IFLA_UNSPEC = 0
+ IFLA_ADDRESS = auto()
+ IFLA_BROADCAST = auto()
+ IFLA_IFNAME = auto()
+ IFLA_MTU = auto()
+ IFLA_LINK = auto()
+ IFLA_QDISC = auto()
+ IFLA_STATS = auto()
+ IFLA_COST = auto()
+ IFLA_PRIORITY = auto()
+ IFLA_MASTER = auto()
+ IFLA_WIRELESS = auto()
+ IFLA_PROTINFO = auto()
+ IFLA_TXQLEN = auto()
+ IFLA_MAP = auto()
+ IFLA_WEIGHT = auto()
+ IFLA_OPERSTATE = auto()
+ IFLA_LINKMODE = auto()
+ IFLA_LINKINFO = auto()
+ IFLA_NET_NS_PID = auto()
+ IFLA_IFALIAS = auto()
+ IFLA_NUM_VF = auto()
+ IFLA_VFINFO_LIST = auto()
+ IFLA_STATS64 = auto()
+ IFLA_VF_PORTS = auto()
+ IFLA_PORT_SELF = auto()
+ IFLA_AF_SPEC = auto()
+ IFLA_GROUP = auto()
+ IFLA_NET_NS_FD = auto()
+ IFLA_EXT_MASK = auto()
+ IFLA_PROMISCUITY = auto()
+ IFLA_NUM_TX_QUEUES = auto()
+ IFLA_NUM_RX_QUEUES = auto()
+ IFLA_CARRIER = auto()
+ IFLA_PHYS_PORT_ID = auto()
+ IFLA_CARRIER_CHANGES = auto()
+ IFLA_PHYS_SWITCH_ID = auto()
+ IFLA_LINK_NETNSID = auto()
+ IFLA_PHYS_PORT_NAME = auto()
+ IFLA_PROTO_DOWN = auto()
+ IFLA_GSO_MAX_SEGS = auto()
+ IFLA_GSO_MAX_SIZE = auto()
+ IFLA_PAD = auto()
+ IFLA_XDP = auto()
+ IFLA_EVENT = auto()
+ IFLA_NEW_NETNSID = auto()
+ IFLA_IF_NETNSID = auto()
+ IFLA_CARRIER_UP_COUNT = auto()
+ IFLA_CARRIER_DOWN_COUNT = auto()
+ IFLA_NEW_IFINDEX = auto()
+ IFLA_MIN_MTU = auto()
+ IFLA_MAX_MTU = auto()
+ IFLA_PROP_LIST = auto()
+ IFLA_ALT_IFNAME = auto()
+ IFLA_PERM_ADDRESS = auto()
+ IFLA_PROTO_DOWN_REASON = auto()
+
+
+class IfaddrMsg(Structure):
+ _fields_ = [
+ ("ifa_family", c_ubyte),
+ ("ifa_prefixlen", c_ubyte),
+ ("ifa_flags", c_ubyte),
+ ("ifa_scope", c_ubyte),
+ ("ifa_index", c_uint),
+ ]
+
+
+class IfattrType(Enum):
+ IFA_UNSPEC = 0
+ IFA_ADDRESS = auto()
+ IFA_LOCAL = auto()
+ IFA_LABEL = auto()
+ IFA_BROADCAST = auto()
+ IFA_ANYCAST = auto()
+ IFA_CACHEINFO = auto()
+ IFA_MULTICAST = auto()
+ IFA_FLAGS = auto()
+ IFA_RT_PRIORITY = auto()
+ IFA_TARGET_NETNSID = auto()
+
+
+class GenlMsgHdr(Structure):
+ _fields_ = [
+ ("cmd", c_ubyte),
+ ("version", c_ubyte),
+ ("reserved", c_ushort),
+ ]
+
+
+class NlConst():
+ AF_NETLINK = 38
+ NETLINK_ROUTE = 0
+ NETLINK_GENERIC = 16
+
+
+class NlHelper():
+ def __init__(self):
+ self._pmap = {}
+ self._af_cls = self.get_af_cls()
+
+ def get_af_cls(self):
+ if sys.platform.startswith("freebsd"):
+ cls = AddressFamilyBsd
+ else:
+ cls = AddressFamilyLinux
+ return cls
+
+ def get_propmap(self, cls):
+ if cls not in self._pmap:
+ ret = {}
+ for prop in dir(cls):
+ if not prop.startswith("_"):
+ ret[getattr(cls, prop).value] = prop
+ self._pmap[cls] = ret
+ return self._pmap[cls]
+
+ def get_name_propmap(self, cls):
+ ret = {}
+ for prop in dir(cls):
+ if not prop.startswith("_"):
+ ret[prop] = getattr(cls, prop).value
+ return ret
+
+ def get_attr_byval(self, cls, attr_val):
+ propmap = self.get_propmap(cls)
+ return propmap.get(attr_val)
+
+ def get_nlmsg_name(self, val):
+ for cls in [NlRtMsgType, NlMsgType]:
+ v = self.get_attr_byval(cls, val)
+ if v is not None:
+ return v
+ return "msg#{}".format(val)
+
+ def get_af_name(self, family):
+ v = self.get_attr_byval(self._af_cls, family)
+ if v is not None:
+ return v
+ return "af#{}".format(family)
+
+ def get_af_value(self, family_str: str) -> int:
+ propmap = self.get_name_propmap(self._af_cls)
+ return propmap.get(family_str)
+
+ def get_rta_name(self, val):
+ return self.get_attr_byval(RtattrType, val)
+
+ def get_bitmask_map(self, cls, val):
+ propmap = self.get_propmap(cls)
+ v = 1
+ ret = {}
+ while val:
+ if v & val:
+ if v in propmap:
+ ret[v] = propmap[v]
+ else:
+ ret[v] = hex(v)
+ val -= v
+ v *= 2
+ return ret
+
+ def get_bitmask_str(self, cls, val):
+ bmap = self.get_bitmask_map(cls, val)
+ return ",".join([v for k, v in bmap.items()])
+
+ def get_nlm_flags_str(self, msg_str: str, reply: bool, val):
+ if reply:
+ return self.get_bitmask_str(NlmAckFlags, val)
+ if msg_str.startswith("RTM_GET"):
+ return self.get_bitmask_str(NlmGetFlags, val)
+ elif msg_str.startswith("RTM_DEL"):
+ return self.get_bitmask_str(NlmDeleteFlags, val)
+ elif msg_str.startswith("RTM_NEW"):
+ return self.get_bitmask_str(NlmNewFlags, val)
+ else:
+ return self.get_bitmask_str(NlmBaseFlags, val)
+
+
+class BaseRtAttr(object):
+ def __init__(self, parent, rta_type, rta_len, data=None):
+ self.parent = parent
+ self.helper = parent.helper
+ self.attr_enum = parent.attr_enum
+ self.rta_type = rta_type & 0x3f
+ self.is_nested = rta_type & (1 << 15)
+ self.network_byte_order = rta_type & (1 << 14)
+ self.rta_len = rta_len
+ self.rta_type_str = self.helper.get_attr_byval(self.attr_enum, self.rta_type) # noqa: E501
+ if data is not None:
+ self._validate(data)
+ self._parse(data)
+ self._orig_data = data
+
+ def print_attribute(self, prepend=""):
+ if self.rta_type_str:
+ type_str = self.rta_type_str
+ else:
+ type_str = "rta#{}".format(self.rta_type)
+ print("{}rta_len={} rta_type={}({}){}".format(prepend,
+ self.rta_len,
+ type_str,
+ self.rta_type,
+ self._print_attr_value())
+ )
+
+ def _print_attr_value(self):
+ return " [" + " ".join(["{:02X}".format(b) for b in self._orig_data[4:]]) + "]" # noqa: E501
+
+ @classmethod
+ def from_bytes(cls, parent, data):
+ if len(data) < sizeof(RtAttr):
+ raise ValueError("length less than rtattr header")
+ rta_hdr = RtAttr.from_buffer_copy(data)
+ self = cls(parent, rta_hdr.rta_type, rta_hdr.rta_len, data[:rta_hdr.rta_len]) # noqa: E501
+ # XXX: nested
+ return self
+
+ def __bytes__(self):
+ ret = self._orig_data
+ if align4(len(ret)) != len(ret):
+ ret += bytes(align4(len(ret)) - len(ret))
+ return ret
+
+ def _validate(self, data):
+ pass
+
+ def _parse(self, data):
+ pass
+
+
+class RtAttrIp(BaseRtAttr):
+ def _validate(self, data):
+ data_len = len(data) - 4
+ if data_len != 4 and data_len != 16:
+ raise ValueError("Error validating attr {}: rta_len is not valid".format( # noqa: E501
+ self.rta_type_str))
+
+ def _parse(self, data):
+ data_len = len(data) - 4
+ if data_len == 4:
+ self.family = socket.AF_INET
+ self.addr = socket.inet_ntop(self.family, data[4:8])
+ else:
+ self.family = socket.AF_INET6
+ self.addr = socket.inet_ntop(self.family, data[4:20])
+
+ def _print_attr_value(self):
+ return " addr={}".format(self.addr)
+
+
+class RtAttrU32(BaseRtAttr):
+ def _validate(self, data):
+ if len(data) != 8:
+ raise ValueError("Error validating attr {}: rta_len is not valid".format( # noqa: E501
+ self.rta_type_str))
+
+ def _parse(self, data):
+ self.value = struct.unpack("@I", data[4:8])[0]
+
+ def _print_attr_value(self):
+ return " value={}".format(self.value)
+
+
+class RtAttrIfindex(RtAttrU32):
+ def _print_attr_value(self):
+ try:
+ ifname = socket.if_indextoname(self.value)
+ return " iface={}(#{})".format(ifname, self.value)
+ except OSError as e:
+ pass
+ return " iface=if#{}".format(self.value)
+
+
+class RtAttrTable(RtAttrU32):
+ def _print_attr_value(self):
+ return " rtable={}".format(self.value)
+
+
+class RtAttrNhId(RtAttrU32):
+ def _print_attr_value(self):
+ return " nh_id={}".format(self.value)
+
+
+class RtAttrVia(BaseRtAttr):
+ def _validate(self, data):
+ data_len = len(data) - 4
+ if data_len == 0:
+ raise ValueError("Error validating attr {}: empty data".format(self.rta_type_str)) # noqa: E501
+ family = int(data_len[0])
+ if family not in (socket.AF_INET, socket.AF_INET6):
+ raise ValueError("Error validating attr {}: unsupported AF {}".format( # noqa: E501
+ self.rta_type_str, family))
+ if family == socket.AF_INET:
+ expected_len = 1 + 4
+ else:
+ expected_len = 1 + 16
+ if data_len != expected_len:
+ raise ValueError("Error validating attr {}: expected len {} got {}".format( # noqa: E501
+ self.rta_type_str, expected_len, data_len))
+
+ def _parse(self, data):
+ data_len = len(data) - 4
+ self.family = int(data_len[0])
+ if self.family == socket.AF_INET:
+ self.addr = socket.inet_ntop(self.family, data[5:9])
+ else:
+ self.addr = socket.inet_ntop(self.family, data[5:21])
+
+ def _print_attr_value(self):
+ return ", via={}".format(self.addr)
+
+
+class RtAttrStr(BaseRtAttr):
+ def _validate(self, data):
+ try:
+ s = data[4:].decode("utf-8")
+ except Exception as e:
+ raise ValueError("wrong utf-8 string")
+
+ def _parse(self, data):
+ self.str = data[4:].decode("utf-8")
+
+ def _print_attr_value(self):
+ return " str=\"{}\"".format(self.str)
+
+
+rta_class_map = {
+ "RTA_DST": RtAttrIp,
+ "RTA_SRC": RtAttrIp,
+ "RTA_IIF": RtAttrIfindex,
+ "RTA_OIF": RtAttrIfindex,
+ "RTA_GATEWAY": RtAttrIp,
+ "RTA_TABLE": RtAttrTable,
+ "RTA_VIA": RtAttrVia,
+ "RTA_NH_ID": RtAttrNhId,
+}
+
+err_class_map = {
+ "NLMSGERR_ATTR_MSG": RtAttrStr,
+ "NLMSGERR_ATTR_OFFS": RtAttrU32,
+}
+
+ifla_class_map = {
+ "IFLA_MTU": RtAttrU32,
+}
+
+ifa_class_map = {
+ "IFA_ADDRESS": RtAttrIp,
+ "IFA_LOCAL": RtAttrIp,
+ "IFA_LABEL": RtAttrStr,
+ "IFA_BROADCAST": RtAttrIp,
+ "IFA_ANYCAST": RtAttrIp,
+ "IFA_FLAGS": RtAttrU32,
+}
+
+
+class BaseNetlinkMessage(object):
+ def __init__(self, helper, nlmsg_type):
+ self.nlmsg_type = nlmsg_type
+ self.ut = unittest.TestCase()
+ self.nla_list = []
+ self._orig_data = None
+ self.helper = helper
+ self.nl_hdr = Nlmsghdr(nlmsg_type=nlmsg_type)
+
+ def assertEqual(self, a, b, msg=None):
+ self.ut.assertEqual(a, b, msg)
+
+ def assertNotEqual(self, a, b, msg=None):
+ self.ut.assertNotEqual(a, b, msg)
+
+ @staticmethod
+ def parse_nl_header(data: bytes):
+ if len(data) < sizeof(Nlmsghdr):
+ raise ValueError("length less than netlink message header")
+ return Nlmsghdr.from_buffer_copy(data), sizeof(Nlmsghdr)
+
+ def is_reply(self, hdr):
+ return hdr.nlmsg_type == NlMsgType.NLMSG_ERROR.value
+
+ def print_nl_header(self, hdr, prepend=""):
+ # len=44, type=RTM_DELROUTE, flags=NLM_F_REQUEST|NLM_F_ACK, seq=1641163704, pid=0 # noqa: E501
+ is_reply = self.is_reply(hdr)
+ msg_name = self.helper.get_nlmsg_name(hdr.nlmsg_type)
+ print("{}len={}, type={}, flags={}(0x{:X}), seq={}, pid={}".format(
+ prepend,
+ hdr.nlmsg_len,
+ msg_name,
+ self.helper.get_nlm_flags_str(msg_name, is_reply, hdr.nlmsg_flags), # noqa: E501
+ hdr.nlmsg_flags,
+ hdr.nlmsg_seq,
+ hdr.nlmsg_pid
+ ))
+
+ @classmethod
+ def from_bytes(cls, helper, data):
+ try:
+ hdr, hdrlen = BaseNetlinkMessage.parse_nl_header(data)
+ self = cls(helper, hdr.nlmsg_type)
+ self._orig_data = data
+ self.nl_hdr = hdr
+ except ValueError as e:
+ print("Failed to parse nl header: {}".format(e))
+ cls.print_as_bytes(data)
+ raise
+ return self
+
+ def print_message(self):
+ self.print_nl_header(self.nl_hdr)
+
+ @staticmethod
+ def print_as_bytes(data: bytes, descr: str):
+ print("===vv {} (len:{:3d}) vv===".format(descr, len(data)))
+ off = 0
+ step = 16
+ while off < len(data):
+ for i in range(step):
+ if off + i < len(data):
+ print(" {:02X}".format(data[off + i]), end="")
+ print("")
+ off += step
+ print("--------------------")
+
+
+class StdNetlinkMessage(BaseNetlinkMessage):
+ @classmethod
+ def from_bytes(cls, helper, data):
+ try:
+ hdr, hdrlen = BaseNetlinkMessage.parse_nl_header(data)
+ self = cls(helper, hdr.nlmsg_type)
+ self._orig_data = data
+ self.nl_hdr = hdr
+ except ValueError as e:
+ print("Failed to parse nl header: {}".format(e))
+ cls.print_as_bytes(data)
+ raise
+
+ offset = align4(hdrlen)
+ try:
+ base_hdr, hdrlen = self.parse_base_header(data[offset:])
+ self.base_hdr = base_hdr
+ offset += align4(hdrlen)
+ ## XXX: CAP_ACK
+ except ValueError as e:
+ print("Failed to parse nl rt header: {}".format(e))
+ cls.print_as_bytes(data)
+ raise
+
+ orig_offset = offset
+ try:
+ nla_list, nla_len = self.parse_nla_list(data[offset:])
+ offset += nla_len
+ if offset != len(data):
+ raise ValueError("{} bytes left at the end of the packet".format(len(data) - offset)) # noqa: E501
+ self.nla_list = nla_list
+ except ValueError as e:
+ print("Failed to parse nla attributes at offset {}: {}".format(orig_offset, e)) # noqa: E501
+ cls.print_as_bytes(data, "msg dump")
+ cls.print_as_bytes(data[orig_offset:], "failed block")
+ raise
+ return self
+
+ def parse_nla_list(self, data: bytes) -> List[BaseRtAttr]:
+ ret = []
+ offset = 0
+ while offset < len(data):
+ # print("OFFSET={}".format(offset))
+ if offset + 4 > len(data):
+ raise ValueError("only {} bytes remaining".format(len(data) - offset)) # noqa: E501
+ rta_hdr = RtAttr.from_buffer_copy(data[offset:])
+ rta_type_str = self.helper.get_attr_byval(self.attr_enum, rta_hdr.rta_type) # noqa: E501
+ cls = self.attr_class_map.get(rta_type_str, BaseRtAttr)
+ rta = cls.from_bytes(self, data[offset:])
+ offset += align4(rta.rta_len)
+ if rta.rta_len == 0:
+ raise ValueError("empty rta len, {} bytes remaining".format(len(data) - offset)) # noqa: E501
+ ret.append(rta)
+ return ret, offset
+
+ def print_message(self):
+ self.print_nl_header(self.nl_hdr)
+ self.print_base_header(self.base_hdr, " ")
+ for nla in self.nla_list:
+ nla.print_attribute(" ")
+
+
+class NetlinkErrorMessage(StdNetlinkMessage):
+ messages = [NlMsgType.NLMSG_ERROR.value]
+ attr_class_map = err_class_map
+ attr_enum = NlErrattrType
+
+ def __init__(self, helper, nlmsg_type):
+ super().__init__(helper, nlmsg_type)
+ self.err_hdr = Nlmsgerr()
+
+ def parse_base_header(self, data):
+ if len(data) < sizeof(Nlmsgerr):
+ raise ValueError("length less than nlmsgerr header")
+ err_hdr = Nlmsgerr.from_buffer_copy(data)
+ sz = sizeof(Nlmsgerr)
+ if (self.nl_hdr.nlmsg_flags & 0x100) == 0:
+ sz += align4(err_hdr.msg.nlmsg_len - sizeof(Nlmsghdr))
+ return (err_hdr, sz)
+
+ def print_base_header(self, errhdr, prepend=""):
+ print("{}error={}, ".format(prepend, errhdr.error), end="")
+ self.print_nl_header(errhdr.msg, prepend)
+
+
+class BaseNetlinkRtMessage(StdNetlinkMessage):
+ attr_class_map = {}
+ attr_enum = None
+
+ def __init__(self, helper, nlm_type):
+ super().__init__(helper, nlm_type)
+ self.base_hdr = None
+
+ def __bytes__(self):
+ ret = bytes()
+ for nla in self.nla_list:
+ ret += bytes(nla)
+ ret = bytes(self.base_hdr) + ret
+ self.nl_hdr.nlmsg_len = len(ret) + sizeof(Nlmsghdr)
+ return bytes(self.nl_hdr) + ret
+
+ def print_message(self):
+ self.print_nl_header(self.nl_hdr)
+ self.print_base_header(self.base_hdr, " ")
+ for nla in self.nla_list:
+ nla.print_attribute(" ")
+
+
+class NetlinkRtMessage(BaseNetlinkRtMessage):
+ messages = [
+ NlRtMsgType.RTM_NEWROUTE.value,
+ NlRtMsgType.RTM_DELROUTE.value,
+ NlRtMsgType.RTM_GETROUTE.value,
+ ]
+ attr_class_map = rta_class_map
+ attr_enum = RtattrType
+
+ def __init__(self, helper, nlm_type):
+ super().__init__(helper, nlm_type)
+ self.base_hdr = RtMsgHdr()
+
+ def parse_base_header(self, data):
+ if len(data) < sizeof(RtMsgHdr):
+ raise ValueError("length less than rtmsg header")
+ rtm_hdr = RtMsgHdr.from_buffer_copy(data)
+ return (rtm_hdr, sizeof(RtMsgHdr))
+
+ def print_base_header(self, hdr, prepend=""):
+ family = self.helper.get_af_name(hdr.rtm_family)
+ print("{}family={}, dst_len={}, src_len={}, tos={}, table={}, protocol={}({}), scope={}({}), type={}({}), flags={}({})".format( # noqa: E501
+ prepend,
+ family,
+ hdr.rtm_dst_len,
+ hdr.rtm_src_len,
+ hdr.rtm_tos,
+ hdr.rtm_table,
+ self.helper.get_attr_byval(RtProto, hdr.rtm_protocol),
+ hdr.rtm_protocol,
+ self.helper.get_attr_byval(RtScope, hdr.rtm_scope),
+ hdr.rtm_scope,
+ self.helper.get_attr_byval(RtType, hdr.rtm_type),
+ hdr.rtm_type,
+ self.helper.get_bitmask_str(RtMsgFlags, hdr.rtm_flags),
+ hdr.rtm_flags))
+
+
+class NetlinkIflaMessage(BaseNetlinkRtMessage):
+ messages = [
+ NlRtMsgType.RTM_NEWLINK.value,
+ NlRtMsgType.RTM_DELLINK.value,
+ NlRtMsgType.RTM_GETLINK.value,
+ ]
+ attr_class_map = ifla_class_map
+ attr_enum = IflattrType
+
+ def __init__(self, helper, nlm_type):
+ super().__init__(helper, nlm_type)
+ self.base_hdr = IfinfoMsg()
+
+ def parse_base_header(self, data):
+ if len(data) < sizeof(IfinfoMsg):
+ raise ValueError("length less than IfinfoMsg header")
+ rtm_hdr = IfinfoMsg.from_buffer_copy(data)
+ return (rtm_hdr, sizeof(IfinfoMsg))
+
+ def print_base_header(self, hdr, prepend=""):
+ family = self.helper.get_af_name(hdr.ifi_family)
+ print("{}family={}, ifi_type={}, ifi_index={}, ifi_flags={}, ifi_change={}".format( # noqa: E501
+ prepend,
+ family,
+ hdr.ifi_type,
+ hdr.ifi_index,
+ hdr.ifi_flags,
+ hdr.ifi_change))
+
+
+class NetlinkIfaMessage(BaseNetlinkRtMessage):
+ messages = [
+ NlRtMsgType.RTM_NEWADDR.value,
+ NlRtMsgType.RTM_DELADDR.value,
+ NlRtMsgType.RTM_GETADDR.value,
+ ]
+ attr_class_map = ifa_class_map
+ attr_enum = IfattrType
+
+ def __init__(self, helper, nlm_type):
+ super().__init__(helper, nlm_type)
+ self.base_hdr = IfaddrMsg()
+
+ def parse_base_header(self, data):
+ if len(data) < sizeof(IfaddrMsg):
+ raise ValueError("length less than IfaddrMsg header")
+ rtm_hdr = IfaddrMsg.from_buffer_copy(data)
+ return (rtm_hdr, sizeof(IfaddrMsg))
+
+ def print_base_header(self, hdr, prepend=""):
+ family = self.helper.get_af_name(hdr.ifa_family)
+ print("{}family={}, ifa_prefixlen={}, ifa_flags={}, ifa_scope={}, ifa_index={}".format( # noqa: E501
+ prepend,
+ family,
+ hdr.ifa_prefixlen,
+ hdr.ifa_flags,
+ hdr.ifa_scope,
+ hdr.ifa_index))
+
+
+class Nlsock():
+ def __init__(self, family, helper):
+ self.helper = helper
+ self.sock_fd = self._setup_netlink(family)
+ self._data = bytes()
+ self.rtm_seq = 1
+ self.pid = os.getpid()
+ self.msgmap = self.build_msgmap()
+ self.set_groups(NlRtGroup.RTNLGRP_IPV4_ROUTE.value | NlRtGroup.RTNLGRP_IPV6_ROUTE.value) # noqa: E501
+
+ def build_msgmap(self):
+ classes = [NetlinkRtMessage, NetlinkIfaMessage, NetlinkErrorMessage]
+ xmap = {}
+ for cls in classes:
+ for message in cls.messages:
+ xmap[message] = cls
+ return xmap
+
+ def get_seq(self):
+ ret = self.rtm_seq
+ self.rtm_seq += 1
+ return ret
+
+ def _setup_netlink(self, netlink_family) -> int:
+ family = self.helper.get_af_value("AF_NETLINK")
+ s = socket.socket(family, socket.SOCK_RAW, netlink_family)
+ s.setsockopt(270, 10, 1) # NETLINK_CAP_ACK
+ s.setsockopt(270, 11, 1) # NETLINK_EXT_ACK
+ return s
+
+ def set_groups(self, mask: int):
+ self.sock_fd.setsockopt(socket.SOL_SOCKET, 1, mask)
+ # snl = SockaddrNl(nl_len = sizeof(SockaddrNl), nl_family=38,
+ # nl_pid=self.pid, nl_groups=mask)
+ # xbuffer = create_string_buffer(sizeof(SockaddrNl))
+ # memmove(xbuffer, addressof(snl), sizeof(SockaddrNl))
+ # k = struct.pack("@BBHII", 12, 38, 0, self.pid, mask)
+ # self.sock_fd.bind(k)
+
+ def write_message(self, msg):
+ print("vvvvvvvv OUT vvvvvvvv")
+ msg.print_message()
+ msg_bytes = bytes(msg)
+ try:
+ ret = os.write(self.sock_fd.fileno(), bytes(msg))
+ except Exception as e:
+ print("write({}) -> {}".format(len(msg_bytes), e))
+
+ def parse_message(self, data: bytes):
+ if len(data) < sizeof(Nlmsghdr):
+ raise Exception("Short read from nl: {} bytes".format(len(data)))
+ hdr = Nlmsghdr.from_buffer_copy(data)
+ nlmsg_type = hdr.nlmsg_type
+ cls = self.msgmap.get(nlmsg_type)
+ if not cls:
+ cls = BaseNetlinkMessage
+ return cls.from_bytes(self.helper, data)
+
+ def write_data(self, data: bytes):
+ self.sock_fd.send(data)
+
+ def read_data(self):
+ while True:
+ data = self.sock_fd.recv(65535)
+ self._data += data
+ if len(self._data) >= sizeof(Nlmsghdr):
+ break
+ if seq is None:
+ break
+ hdr = Nlmsghdr.from_buffer_copy(data)
+ if hdr.nlmsg_pid == self.pid and hdr.nlmsg_seq == seq:
+ break
+ return data
+
+ def read_message(self) -> bytes:
+ if len(self._data) < sizeof(Nlmsghdr):
+ self.read_data()
+ hdr = Nlmsghdr.from_buffer_copy(self._data)
+ while (hdr.nlmsg_len > len(self._data)):
+ self.read_data()
+ raw_msg = self._data[:hdr.nlmsg_len]
+ self._data = self._data[hdr.nlmsg_len:]
+ return self.parse_message(raw_msg)
+
+ def fill_msg_seq(self, msg):
+ msg.nl_hdr.nlmsg_seq = self.get_seq()
+ msg.nl_hdr.nlmsg_pid = self.pid
+
+ def request_ifaces(self):
+ msg = NetlinkIfaMessage(self.helper, NlRtMsgType.RTM_GETLINK.value)
+ flags = NlmGetFlags.NLM_F_ROOT.value | NlmGetFlags.NLM_F_MATCH.value
+ self.fill_msg_seq(msg)
+ msg.nl_hdr.nlmsg_flags = flags | NlmBaseFlags.NLM_F_REQUEST.value
+
+ msg_bytes = bytes(msg)
+ x = self.parse_message(msg_bytes)
+ x.print_message()
+ print(msg_bytes)
+ # Skip family for now
+ self.write_data(msg_bytes)
+
+ def request_ifaddrs(self, family):
+ msg = NetlinkIfaMessage(self.helper, NlRtMsgType.RTM_GETADDR.value)
+ flags = NlmGetFlags.NLM_F_ROOT.value | NlmGetFlags.NLM_F_MATCH.value
+ self.fill_msg_seq(msg)
+ msg.base_hdr.ifa_family = family
+ msg.nl_hdr.nlmsg_flags = flags | NlmBaseFlags.NLM_F_REQUEST.value
+
+ msg_bytes = bytes(msg)
+ x = self.parse_message(msg_bytes)
+ x.print_message()
+ print(msg_bytes)
+ # Skip family for now
+ self.write_data(msg_bytes)
+
+ def request_routes(self, family):
+ msg = NetlinkRtMessage(self.helper, NlRtMsgType.RTM_GETROUTE.value)
+ flags = NlmGetFlags.NLM_F_ROOT.value | NlmGetFlags.NLM_F_MATCH.value
+ self.fill_msg_seq(msg)
+ msg.base_hdr.rtm_family = family
+ msg.nl_hdr.nlmsg_flags = flags | NlmBaseFlags.NLM_F_REQUEST.value
+
+ msg_bytes = bytes(msg)
+ x = self.parse_message(msg_bytes)
+ x.print_message()
+ print(msg_bytes)
+ # Skip family for now
+ self.write_data(msg_bytes)
+
+ def request_raw(self):
+ flags = NlmGetFlags.NLM_F_ROOT.value | NlmGetFlags.NLM_F_MATCH.value
+ hdr = Nlmsghdr(
+ nlmsg_type = NlRtMsgType.RTM_GETROUTE.value,
+ nlmsg_flags = flags | NlmBaseFlags.NLM_F_REQUEST.value,
+ nlmsg_len = sizeof(Nlmsghdr) + sizeof(RtMsgHdr) + 4,
+ )
+ rthdr = RtMsgHdr()
+
+ rta = RtAttr(rta_len=3, rta_type=RtattrType.RTA_OIF.value)
+
+ msg_bytes = bytes(hdr) + bytes(rthdr) + bytes(rta)
+ # x = self.parse_message(msg_bytes)
+ # x.print_message()
+ print(msg_bytes)
+ self.write_data(msg_bytes)
+
+ def request_families(self):
+ hdr = Nlmsghdr(
+ nlmsg_type = 16,
+ nlmsg_flags = NlmBaseFlags.NLM_F_REQUEST.value,
+ nlmsg_len = sizeof(Nlmsghdr) + sizeof(GenlMsgHdr) + 4,
+ )
+ ghdr = GenlMsgHdr(cmd=3)
+
+ rta = RtAttr(rta_len=3, rta_type=RtattrType.RTA_OIF)
+
+ msg_bytes = bytes(hdr) + bytes(ghdr) + bytes(rta)
+ x = self.parse_message(msg_bytes)
+ x.print_message()
+ print(msg_bytes)
+ self.write_data(msg_bytes)
+
+
+def main():
+ helper = NlHelper()
+ if False:
+ nl = Nlsock(NlConst.NETLINK_GENERIC, helper)
+ nl.request_families()
+ else:
+ nl = Nlsock(NlConst.NETLINK_ROUTE, helper)
+ # nl.request_ifaddrs(socket.AF_INET)
+ # nl.request_raw()
+ nl.request_routes(0)
+ # nl.request_ifaces()
+ while True:
+ msg = nl.read_message()
+ print("")
+ msg.print_message()
+ msg.print_as_bytes(msg._orig_data, "-- DATA --")
+
+ pass
+
+
+if __name__ == "__main__":
+ main()

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