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diff --git a/share/man/man4/ng_bridge.4 b/share/man/man4/ng_bridge.4
--- a/share/man/man4/ng_bridge.4
+++ b/share/man/man4/ng_bridge.4
@@ -34,7 +34,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd October 2, 2019
+.Dd February 6, 2021
.Dt NG_BRIDGE 4
.Os
.Sh NAME
@@ -92,6 +92,23 @@
hook of an
.Xr ng_ether 4
node to the bridge node.
+.Pp
+Instead of naming a hook
+.Dv linkX
+the hook might be also named
+.Dv uplinkX .
+The node does not learn MAC addresses on uplink hooks, which keeps
+the internal address table small.
+This way it is desirable to connect the
+.Dv lower
+hook of an
+.Xr ng_ether 4
+node to an
+.Dv uplink
+hook of the bridge, and ignore the complexity of the outside world.
+Frames with unknown MACs are always sent out to
+.Dv uplink
+hooks, so no functionality is lost.
.Sh CONTROL MESSAGES
This node type supports the generic control messages, plus the
following:
@@ -141,8 +158,9 @@
This command takes a four byte link number as an argument and
returns a
.Dv "struct ng_bridge_link_stats"
-containing statistics for the corresponding link, which must be
-currently connected:
+containing statistics for the corresponding
+.Dv link ,
+which must be currently connected:
.Bd -literal -offset 0n
/* Statistics structure (one for each link) */
struct ng_bridge_link_stats {
@@ -162,6 +180,12 @@
uint64_t memoryFailures; /* times couldn't get mem or mbuf */
};
.Ed
+.Pp
+Negative numbers refer to the
+.Dv uplink
+hooks.
+So querying for -7 will get the statistics for hook
+.Dv uplink7 .
.It Dv NGM_BRIDGE_CLR_STATS Pq Ic clrstats
This command takes a four byte link number as an argument and
clears the statistics for that link.
diff --git a/sys/netgraph/ng_bridge.h b/sys/netgraph/ng_bridge.h
--- a/sys/netgraph/ng_bridge.h
+++ b/sys/netgraph/ng_bridge.h
@@ -64,6 +64,8 @@
/* Hook names */
#define NG_BRIDGE_HOOK_LINK_PREFIX "link" /* append decimal integer */
#define NG_BRIDGE_HOOK_LINK_FMT "link%d" /* for use with printf(3) */
+#define NG_BRIDGE_HOOK_UPLINK_PREFIX "uplink" /* append decimal integer */
+#define NG_BRIDGE_HOOK_UPLINK_FMT "uplink%d" /* for use with printf(3) */
/* Node configuration structure */
struct ng_bridge_config {
diff --git a/sys/netgraph/ng_bridge.c b/sys/netgraph/ng_bridge.c
--- a/sys/netgraph/ng_bridge.c
+++ b/sys/netgraph/ng_bridge.c
@@ -91,6 +91,8 @@
struct ng_bridge_link {
hook_p hook; /* netgraph hook */
u_int16_t loopCount; /* loop ignore timer */
+ unsigned int learnMac : 1, /* autolearn macs */
+ sendUnknown : 1;/* send unknown macs out */
struct ng_bridge_link_stats stats; /* link stats */
};
@@ -334,38 +336,49 @@
ng_bridge_newhook(node_p node, hook_p hook, const char *name)
{
const priv_p priv = NG_NODE_PRIVATE(node);
+ char linkName[NG_HOOKSIZ];
+ u_int32_t linkNum;
+ link_p link;
+ const char *prefix = NG_BRIDGE_HOOK_LINK_PREFIX;
+ bool isUplink;
/* Check for a link hook */
- if (strlen(name) > strlen(NG_BRIDGE_HOOK_LINK_PREFIX)) {
- char linkName[NG_HOOKSIZ];
- u_int32_t linkNum;
- link_p link;
-
- /* primitive parsing */
- linkNum = strtoul(name + strlen(NG_BRIDGE_HOOK_LINK_PREFIX),
- NULL, 10);
- /* validation by comparing against the reconstucted name */
- snprintf(linkName, sizeof(linkName),
- "%s%u", NG_BRIDGE_HOOK_LINK_PREFIX,
- linkNum);
- if (strcmp(linkName, name) != 0)
- return (EINVAL);
-
- if(NG_PEER_NODE(hook) == node)
- return (ELOOP);
-
- link = malloc(sizeof(*link), M_NETGRAPH_BRIDGE,
- M_WAITOK|M_ZERO);
- if (link == NULL)
- return (ENOMEM);
- link->hook = hook;
- NG_HOOK_SET_PRIVATE(hook, link);
- priv->numLinks++;
- return (0);
+ if (strlen(name) <= strlen(prefix))
+ return (EINVAL); /* Unknown hook name */
+
+ isUplink = (name[0] == 'u');
+ if (isUplink)
+ prefix = NG_BRIDGE_HOOK_UPLINK_PREFIX;
+
+ /* primitive parsing */
+ linkNum = strtoul(name + strlen(prefix), NULL, 10);
+ /* validation by comparing against the reconstucted name */
+ snprintf(linkName, sizeof(linkName), "%s%u", prefix, linkNum);
+ if (strcmp(linkName, name) != 0)
+ return (EINVAL);
+
+ if (linkNum == 0 && isUplink)
+ return (EINVAL);
+
+ if(NG_PEER_NODE(hook) == node)
+ return (ELOOP);
+
+ link = malloc(sizeof(*link), M_NETGRAPH_BRIDGE, M_ZERO);
+ if (link == NULL)
+ return (ENOMEM);
+
+ link->hook = hook;
+ if (isUplink) {
+ link->learnMac = 0;
+ link->sendUnknown = 1;
+ } else {
+ link->learnMac = 1;
+ link->sendUnknown = 1;
}
- /* Unknown hook name */
- return (EINVAL);
+ NG_HOOK_SET_PRIVATE(hook, link);
+ priv->numLinks++;
+ return (0);
}
/*
@@ -438,6 +451,11 @@
i = 0;
for (bucket = 0; bucket < priv->numBuckets; bucket++) {
SLIST_FOREACH(hent, &priv->tab[bucket], next) {
+ const char *name = NG_HOOK_NAME(hent->host.link->hook);
+ const char *prefix = name[0] == 'u' ?
+ NG_BRIDGE_HOOK_UPLINK_PREFIX :
+ NG_BRIDGE_HOOK_LINK_PREFIX;
+
memcpy(ary->hosts[i].addr,
hent->host.addr,
sizeof(ary->hosts[i].addr));
@@ -445,9 +463,7 @@
ary->hosts[i].staleness =
hent->host.staleness;
ary->hosts[i].linkNum = strtol(
- NG_HOOK_NAME(hent->host.link->hook) +
- strlen(NG_BRIDGE_HOOK_LINK_PREFIX),
- NULL, 10);
+ name + strlen(prefix), NULL, 10);
i++;
}
}
@@ -506,15 +522,20 @@
hook_p hook;
link_p link;
char linkName[NG_HOOKSIZ];
+ int linkNum;
/* Get link number */
if (msg->header.arglen != sizeof(u_int32_t)) {
error = EINVAL;
break;
}
- snprintf(linkName, sizeof(linkName),
- "%s%u", NG_BRIDGE_HOOK_LINK_PREFIX,
- *((u_int32_t *)msg->data));
+ linkNum = *((int32_t *)msg->data);
+ if (linkNum < 0)
+ snprintf(linkName, sizeof(linkName),
+ "%s%u", NG_BRIDGE_HOOK_UPLINK_PREFIX, -linkNum);
+ else
+ snprintf(linkName, sizeof(linkName),
+ "%s%u", NG_BRIDGE_HOOK_LINK_PREFIX, linkNum);
if ((hook = ng_findhook(node, linkName)) == NULL) {
error = ENOTCONN;
@@ -609,6 +630,10 @@
return (1);
}
+ /* Skip sending unknowns to undesired links */
+ if (!ctx->manycast && !destLink->sendUnknown)
+ return (1);
+
if (ctx->foundFirst == NULL) {
/*
* This is the first usable link we have found.
@@ -750,7 +775,7 @@
host->link = ctx.incoming;
host->age = 0;
}
- } else {
+ } else if (ctx.incoming->learnMac) {
if (!ng_bridge_put(priv, eh->ether_shost, ctx.incoming)) {
ctx.incoming->stats.memoryFailures++;
NG_FREE_ITEM(item);

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