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diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4
--- a/share/man/man4/tcp.4
+++ b/share/man/man4/tcp.4
@@ -31,7 +31,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd November 30, 2023
+.Dd January 26, 2024
.Dt TCP 4
.Os
.Sh NAME
@@ -494,11 +494,28 @@
.It 3
Negotiate on incoming connection for Accurate ECN, ECN, or no ECN.
Outgoing connections will request Accurate ECN and fall back to
-ECN depending on the capabilities of the server.
+ECN depending on the capabilities of the remote host.
.It 4
Negotiate on incoming connection for Accurate ECN, ECN, or no ECN.
Outgoing connections will not request ECN.
.El
+.It Va ecn.generalized
+Enable sending all segments as ECN capable transport,
+including SYN, SYN/ACK, and retransmissions.
+This may only be enabled when ECN support itself is also active.
+Disabling ECN support will disable this feature automatically.
+Settings:
+.Bl -tag -compact
+.It 0
+Regular RFC3168 operation.
+Send only new data segments as ECN capable transport.
+(default)
+.It 1
+Support generalized ECN (ECN++), and send all segments of an ECN-enabled
+session as ECN capable transport.
+Also control packets to non-established and non-listening ports are
+identically marked, if outgoing sessions would request ECN.
+.El
.It Va ecn.maxretries
Number of retries (SYN or SYN/ACK retransmits) before disabling ECN on a
specific connection.
diff --git a/sys/netinet/tcp_ecn.h b/sys/netinet/tcp_ecn.h
--- a/sys/netinet/tcp_ecn.h
+++ b/sys/netinet/tcp_ecn.h
@@ -43,11 +43,11 @@
void tcp_ecn_input_syn_sent(struct tcpcb *, uint16_t, int);
void tcp_ecn_input_parallel_syn(struct tcpcb *, uint16_t, int);
int tcp_ecn_input_segment(struct tcpcb *, uint16_t, int, int, int);
-uint16_t tcp_ecn_output_syn_sent(struct tcpcb *);
+int tcp_ecn_output_syn_sent(struct tcpcb *, uint16_t *);
int tcp_ecn_output_established(struct tcpcb *, uint16_t *, int, bool);
void tcp_ecn_syncache_socket(struct tcpcb *, struct syncache *);
int tcp_ecn_syncache_add(uint16_t, int);
-uint16_t tcp_ecn_syncache_respond(uint16_t, struct syncache *);
+int tcp_ecn_syncache_respond(uint16_t *, struct syncache *);
#endif /* _KERNEL */
diff --git a/sys/netinet/tcp_ecn.c b/sys/netinet/tcp_ecn.c
--- a/sys/netinet/tcp_ecn.c
+++ b/sys/netinet/tcp_ecn.c
@@ -104,8 +104,10 @@
"TCP ECN");
VNET_DEFINE(int, tcp_do_ecn) = 2;
-SYSCTL_INT(_net_inet_tcp_ecn, OID_AUTO, enable,
- CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_do_ecn), 0,
+static int sysctl_net_inet_tcp_ecn_enable_check(SYSCTL_HANDLER_ARGS);
+SYSCTL_PROC(_net_inet_tcp_ecn, OID_AUTO, enable,
+ CTLFLAG_VNET | CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_NEEDGIANT,
+ &VNET_NAME(tcp_do_ecn), 0, &sysctl_net_inet_tcp_ecn_enable_check, "IU",
"TCP ECN support");
VNET_DEFINE(int, tcp_ecn_maxretries) = 1;
@@ -113,6 +115,13 @@
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_ecn_maxretries), 0,
"Max retries before giving up on ECN");
+VNET_DEFINE(int, tcp_ecn_generalized) = 0;
+static int sysctl_net_inet_tcp_ecn_generalized_check(SYSCTL_HANDLER_ARGS);
+SYSCTL_PROC(_net_inet_tcp_ecn, OID_AUTO, generalized,
+ CTLFLAG_VNET | CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_NEEDGIANT,
+ &VNET_NAME(tcp_ecn_generalized), 0, &sysctl_net_inet_tcp_ecn_generalized_check, "IU",
+ "Send all packets as ECT");
+
/*
* Process incoming SYN,ACK packet
*/
@@ -121,6 +130,7 @@
{
switch (V_tcp_do_ecn) {
case 0:
+ /* No ECN */
return;
case 1:
/* FALLTHROUGH */
@@ -217,6 +227,11 @@
}
break;
}
+ if (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) {
+ if (V_tcp_ecn_generalized) {
+ tp->t_flags2 |= TF2_ECN_PLUSPLUS;
+ }
+ }
}
/*
@@ -229,6 +244,7 @@
return;
switch (V_tcp_do_ecn) {
case 0:
+ /* No ECN */
return;
case 1:
/* FALLTHROUGH */
@@ -285,6 +301,11 @@
}
break;
}
+ if (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) {
+ if (V_tcp_ecn_generalized) {
+ tp->t_flags2 |= TF2_ECN_PLUSPLUS;
+ }
+ }
}
/*
@@ -364,36 +385,61 @@
cc_ecnpkt_handler_flags(tp, thflags, iptos);
}
- return delta_cep;
+ return (delta_cep);
}
/*
* Send ECN setup <SYN> packet header flags
*/
-uint16_t
-tcp_ecn_output_syn_sent(struct tcpcb *tp)
+int
+tcp_ecn_output_syn_sent(struct tcpcb *tp, uint16_t *thflags)
{
- uint16_t thflags = 0;
-
- if (V_tcp_do_ecn == 0)
- return thflags;
- if (V_tcp_do_ecn == 1) {
+ switch (V_tcp_do_ecn) {
+ case 0:
+ /* No ECN */
+ /* FALLTHROUGH */
+ case 2:
+ /* passive RFC3168 */
+ /* FALLTHROUGH */
+ case 4:
+ /* passive AccECN */
+ /* FALLTHROUGH */
+ break;
+ case 1:
/* Send a RFC3168 ECN setup <SYN> packet */
if (tp->t_rxtshift >= 1) {
- if (tp->t_rxtshift <= V_tcp_ecn_maxretries)
- thflags = TH_ECE|TH_CWR;
- } else
- thflags = TH_ECE|TH_CWR;
- } else if (V_tcp_do_ecn == 3) {
+ if (tp->t_rxtshift <= V_tcp_ecn_maxretries) {
+ *thflags |= TH_ECE|TH_CWR;
+ } else {
+ return (IPTOS_ECN_NOTECT);
+ }
+ } else {
+ *thflags = TH_ECE|TH_CWR;
+ }
+ break;
+ case 3:
/* Send an Accurate ECN setup <SYN> packet */
if (tp->t_rxtshift >= 1) {
- if (tp->t_rxtshift <= V_tcp_ecn_maxretries)
- thflags = TH_ECE|TH_CWR|TH_AE;
- } else
- thflags = TH_ECE|TH_CWR|TH_AE;
+ if (tp->t_rxtshift <= V_tcp_ecn_maxretries) {
+ *thflags |= TH_ECE|TH_CWR|TH_AE;
+ } else {
+ return (IPTOS_ECN_NOTECT);
+ }
+ } else {
+ *thflags |= TH_ECE|TH_CWR|TH_AE;
+ }
+ break;
}
-
- return thflags;
+ if (V_tcp_ecn_generalized) {
+ if (tp->t_flags2 & TF2_ECN_USE_ECT1) {
+ TCPSTAT_INC(tcps_ecn_sndect1);
+ return (IPTOS_ECN_ECT1);
+ } else {
+ TCPSTAT_INC(tcps_ecn_sndect0);
+ return (IPTOS_ECN_ECT0);
+ }
+ }
+ return (IPTOS_ECN_NOTECT);
}
/*
@@ -403,7 +449,7 @@
int
tcp_ecn_output_established(struct tcpcb *tp, uint16_t *thflags, int len, bool rxmit)
{
- int ipecn = IPTOS_ECN_NOTECT;
+ int ect = IPTOS_ECN_NOTECT;
bool newdata;
/*
@@ -415,13 +461,20 @@
newdata = (len > 0 && SEQ_GEQ(tp->snd_nxt, tp->snd_max) &&
!rxmit &&
!((tp->t_flags & TF_FORCEDATA) && len == 1));
- /* RFC3168 ECN marking, only new data segments */
- if (newdata) {
+ /*
+ * RFC3168 ECN marking for new data segments, or
+ * for all segments as ECN-capable transport
+ * when ecn.generalized is set.
+ */
+ if (newdata ||
+ tp->t_flags2 & TF2_ECN_PLUSPLUS ||
+ (tp->t_state == TCPS_SYN_SENT &&
+ V_tcp_ecn_generalized)) {
if (tp->t_flags2 & TF2_ECN_USE_ECT1) {
- ipecn = IPTOS_ECN_ECT1;
+ ect = IPTOS_ECN_ECT1;
TCPSTAT_INC(tcps_ecn_sndect1);
} else {
- ipecn = IPTOS_ECN_ECT0;
+ ect = IPTOS_ECN_ECT0;
TCPSTAT_INC(tcps_ecn_sndect0);
}
}
@@ -452,7 +505,7 @@
*thflags |= TH_ECE;
}
- return ipecn;
+ return (ect);
}
/*
@@ -483,6 +536,10 @@
break;
}
}
+ if (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) {
+ if (V_tcp_ecn_generalized)
+ tp->t_flags2 |= TF2_ECN_PLUSPLUS;
+ }
}
/*
@@ -532,8 +589,9 @@
scflags = SCF_ACE_N;
break;
}
- } else
+ } else {
scflags = SCF_ECN;
+ }
break;
/* Default Case (section 3.1.2) */
default:
@@ -556,46 +614,63 @@
}
break;
}
- return scflags;
+ return (scflags);
}
/*
* Set up the ECN information for the <SYN,ACK> from
* syncache information.
*/
-uint16_t
-tcp_ecn_syncache_respond(uint16_t thflags, struct syncache *sc)
+int
+tcp_ecn_syncache_respond(uint16_t *thflags, struct syncache *sc)
{
- if ((thflags & TH_SYN) &&
+ int ect = IPTOS_ECN_NOTECT;
+
+ if ((*thflags & TH_SYN) &&
(sc->sc_flags & SCF_ECN_MASK)) {
switch (sc->sc_flags & SCF_ECN_MASK) {
case SCF_ECN:
- thflags |= (0 | 0 | TH_ECE);
+ *thflags |= (0 | 0 | TH_ECE);
TCPSTAT_INC(tcps_ecn_shs);
+ if ((V_tcp_ecn_generalized &&
+ (*thflags & TH_ACK)))
+ ect = IPTOS_ECN_ECT0;
break;
case SCF_ACE_N:
- thflags |= (0 | TH_CWR | 0);
+ *thflags |= (0 | TH_CWR | 0);
TCPSTAT_INC(tcps_ecn_shs);
TCPSTAT_INC(tcps_ace_nect);
+ if ((V_tcp_ecn_generalized &&
+ (*thflags & TH_ACK)))
+ ect = IPTOS_ECN_ECT0;
break;
case SCF_ACE_0:
- thflags |= (TH_AE | 0 | 0);
+ *thflags |= (TH_AE | 0 | 0);
TCPSTAT_INC(tcps_ecn_shs);
TCPSTAT_INC(tcps_ace_ect0);
+ if ((V_tcp_ecn_generalized &&
+ (*thflags & TH_ACK)))
+ ect = IPTOS_ECN_ECT0;
break;
case SCF_ACE_1:
- thflags |= (0 | TH_ECE | TH_CWR);
+ *thflags |= (0 | TH_ECE | TH_CWR);
TCPSTAT_INC(tcps_ecn_shs);
TCPSTAT_INC(tcps_ace_ect1);
+ if ((V_tcp_ecn_generalized &&
+ (*thflags & TH_ACK)))
+ ect = IPTOS_ECN_ECT0;
break;
case SCF_ACE_CE:
- thflags |= (TH_AE | TH_CWR | 0);
+ *thflags |= (TH_AE | TH_CWR | 0);
TCPSTAT_INC(tcps_ecn_shs);
TCPSTAT_INC(tcps_ace_ce);
+ if ((V_tcp_ecn_generalized &&
+ (*thflags & TH_ACK)))
+ ect = IPTOS_ECN_ECT0;
break;
}
}
- return thflags;
+ return (ect);
}
static inline int
@@ -610,3 +685,48 @@
*thflags &= ~(TH_AE|TH_CWR|TH_ECE);
*thflags |= ((t_rcep << TH_ACE_SHIFT) & (TH_AE|TH_CWR|TH_ECE));
}
+
+static int
+sysctl_net_inet_tcp_ecn_enable_check(SYSCTL_HANDLER_ARGS)
+{
+ uint32_t new;
+ int error;
+
+ new = V_tcp_do_ecn;
+ error = sysctl_handle_int(oidp, &new, 0, req);
+ if (error == 0 && req->newptr != NULL) {
+ if (new > 4) {
+ error = EINVAL;
+ } else {
+ V_tcp_do_ecn = new;
+ if (new == 0) {
+ V_tcp_ecn_generalized = new;
+ }
+ }
+ }
+
+ return (error);
+}
+
+static int
+sysctl_net_inet_tcp_ecn_generalized_check(SYSCTL_HANDLER_ARGS)
+{
+ uint32_t new;
+ int error;
+
+ new = V_tcp_ecn_generalized;
+ error = sysctl_handle_int(oidp, &new, 0, req);
+ if (error == 0 && req->newptr != NULL) {
+ if (new > 1) {
+ error = EINVAL;
+ } else {
+ if (!V_tcp_do_ecn && new == 1) {
+ error = EINVAL;
+ } else {
+ V_tcp_ecn_generalized = new;
+ }
+ }
+ }
+
+ return (error);
+}
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -414,7 +414,7 @@
stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_CSIG, type);
#endif
- switch(type) {
+ switch (type) {
case CC_NDUPACK:
if (!IN_FASTRECOVERY(tp->t_flags)) {
tp->snd_recover = tp->snd_max;
diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c
--- a/sys/netinet/tcp_output.c
+++ b/sys/netinet/tcp_output.c
@@ -193,6 +193,7 @@
int32_t len;
uint32_t recwin, sendwin;
uint16_t flags;
+ int ect = 0;
int off, error = 0; /* Keep compiler happy */
u_int if_hw_tsomaxsegcount = 0;
u_int if_hw_tsomaxsegsize = 0;
@@ -1185,15 +1186,17 @@
* RFC 3168.
*/
if (tp->t_state == TCPS_SYN_SENT && V_tcp_do_ecn) {
- flags |= tcp_ecn_output_syn_sent(tp);
+ ect = tcp_ecn_output_syn_sent(tp, &flags);
}
/* Also handle parallel SYN for ECN */
- if ((TCPS_HAVERCVDSYN(tp->t_state)) &&
- (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))) {
- int ect = tcp_ecn_output_established(tp, &flags, len, sack_rxmit);
+ if ((tp->t_flags2 & TF2_ECN_PLUSPLUS) ||
+ (TCPS_HAVERCVDSYN(tp->t_state) &&
+ (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)))) {
+ ect = tcp_ecn_output_established(tp, &flags, len, sack_rxmit);
if ((tp->t_state == TCPS_SYN_RECEIVED) &&
- (tp->t_flags2 & TF2_ECN_SND_ECE))
+ (tp->t_flags2 & TF2_ECN_SND_ECE)) {
tp->t_flags2 &= ~TF2_ECN_SND_ECE;
+ }
#ifdef INET6
if (isipv6) {
ip6->ip6_flow &= ~htonl(IPTOS_ECN_MASK << IPV6_FLOWLABEL_LEN);
diff --git a/sys/netinet/tcp_stacks/rack.c b/sys/netinet/tcp_stacks/rack.c
--- a/sys/netinet/tcp_stacks/rack.c
+++ b/sys/netinet/tcp_stacks/rack.c
@@ -19905,6 +19905,7 @@
struct socket *so;
uint32_t recwin;
uint32_t sb_offset, s_moff = 0;
+ uint8_t ect = 0;
int32_t len, error = 0;
uint16_t flags;
struct mbuf *m, *s_mb = NULL;
@@ -21764,15 +21765,17 @@
* as per RFC 3168.
*/
if (tp->t_state == TCPS_SYN_SENT && V_tcp_do_ecn) {
- flags |= tcp_ecn_output_syn_sent(tp);
+ ect |= tcp_ecn_output_syn_sent(tp, &flags);
}
/* Also handle parallel SYN for ECN */
- if (TCPS_HAVERCVDSYN(tp->t_state) &&
- (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))) {
- int ect = tcp_ecn_output_established(tp, &flags, len, sack_rxmit);
+ if ((tp->t_flags2 & TF2_ECN_PLUSPLUS) ||
+ (TCPS_HAVERCVDSYN(tp->t_state) &&
+ (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)))) {
+ ect = tcp_ecn_output_established(tp, &flags, len, sack_rxmit);
if ((tp->t_state == TCPS_SYN_RECEIVED) &&
- (tp->t_flags2 & TF2_ECN_SND_ECE))
+ (tp->t_flags2 & TF2_ECN_SND_ECE)) {
tp->t_flags2 &= ~TF2_ECN_SND_ECE;
+ }
#ifdef INET6
if (isipv6) {
ip6->ip6_flow &= ~htonl(IPTOS_ECN_MASK << 20);
diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c
--- a/sys/netinet/tcp_subr.c
+++ b/sys/netinet/tcp_subr.c
@@ -2000,6 +2000,23 @@
optp = (u_char *) (nth + 1);
optm = m;
}
+ } else {
+ /*
+ * Send out control packets with same IP ECN header
+ */
+ if (V_tcp_ecn_generalized &&
+ ((V_tcp_do_ecn == 1) ||
+ (V_tcp_do_ecn == 3) ||
+ ((tp != NULL) &&
+ (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))))) {
+ if ((tp != NULL) && (tp->t_flags2 & TF2_ECN_USE_ECT1)) {
+ ect = IPTOS_ECN_ECT1;
+ TCPSTAT_INC(tcps_ecn_sndect1);
+ } else {
+ ect = IPTOS_ECN_ECT0;
+ TCPSTAT_INC(tcps_ecn_sndect0);
+ }
+ }
}
if (incl_opts) {
/* Timestamps. */
@@ -2034,12 +2051,10 @@
ip6->ip6_nxt = IPPROTO_TCP;
ip6->ip6_plen = htons(tlen - sizeof(*ip6));
}
-#endif
-#if defined(INET) && defined(INET6)
else
#endif
-#ifdef INET
{
+#ifdef INET
if (uh) {
ulen = tlen - sizeof(struct ip);
uh->uh_ulen = htons(ulen);
@@ -2060,8 +2075,8 @@
}
if (V_path_mtu_discovery)
ip->ip_off |= htons(IP_DF);
- }
#endif
+ }
m->m_pkthdr.len = tlen;
m->m_pkthdr.rcvif = NULL;
#ifdef MAC
diff --git a/sys/netinet/tcp_syncache.c b/sys/netinet/tcp_syncache.c
--- a/sys/netinet/tcp_syncache.c
+++ b/sys/netinet/tcp_syncache.c
@@ -129,7 +129,7 @@
static void syncache_drop(struct syncache *, struct syncache_head *);
static void syncache_free(struct syncache *);
static void syncache_insert(struct syncache *, struct syncache_head *);
-static int syncache_respond(struct syncache *, const struct mbuf *, int);
+static int syncache_respond(struct syncache *, const struct mbuf *, uint16_t);
static struct socket *syncache_socket(struct syncache *, struct socket *,
struct mbuf *m);
static void syncache_timeout(struct syncache *sc, struct syncache_head *sch,
@@ -1798,14 +1798,15 @@
* i.e. m0 != NULL, or upon 3WHS ACK timeout, i.e. m0 == NULL.
*/
static int
-syncache_respond(struct syncache *sc, const struct mbuf *m0, int flags)
+syncache_respond(struct syncache *sc, const struct mbuf *m0, uint16_t flags)
{
struct ip *ip = NULL;
struct mbuf *m;
struct tcphdr *th = NULL;
struct udphdr *udp = NULL;
int optlen, error = 0; /* Make compiler happy */
- u_int16_t hlen, tlen, mssopt, ulen;
+ uint16_t hlen, tlen, mssopt, ulen;
+ int ect;
struct tcpopt to;
#ifdef INET6
struct ip6_hdr *ip6 = NULL;
@@ -1870,12 +1871,10 @@
}
ip6->ip6_flow |= htonl(sc->sc_ip_tos << IPV6_FLOWLABEL_LEN);
}
-#endif
-#if defined(INET6) && defined(INET)
else
#endif
-#ifdef INET
{
+#ifdef INET
ip = mtod(m, struct ip *);
ip->ip_v = IPVERSION;
ip->ip_hl = sizeof(struct ip) >> 2;
@@ -1908,8 +1907,8 @@
ulen = (tlen - sizeof(struct ip));
th = (struct tcphdr *)(udp + 1);
}
- }
#endif /* INET */
+ }
th->th_sport = sc->sc_inc.inc_lport;
th->th_dport = sc->sc_inc.inc_fport;
@@ -1922,7 +1921,17 @@
th->th_win = htons(sc->sc_wnd);
th->th_urp = 0;
- flags = tcp_ecn_syncache_respond(flags, sc);
+ ect = tcp_ecn_syncache_respond(&flags, sc);
+#ifdef INET6
+ if (sc->sc_inc.inc_flags & INC_ISIPV6) {
+ ip6->ip6_flow |= htonl(ect << 20);
+ } else
+#endif
+#ifdef INET
+ {
+ ip->ip_tos |= ect;
+ }
+#endif
tcp_set_flags(th, flags);
/* Tack on the TCP options. */
@@ -2024,12 +2033,10 @@
TCP_PROBE5(send, NULL, NULL, ip6, NULL, th);
error = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
}
-#endif
-#if defined(INET6) && defined(INET)
else
#endif
-#ifdef INET
{
+#ifdef INET
if (sc->sc_port) {
m->m_pkthdr.csum_flags = CSUM_UDP;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
@@ -2053,8 +2060,8 @@
#endif
TCP_PROBE5(send, NULL, NULL, ip, NULL, th);
error = ip_output(m, sc->sc_ipopts, NULL, 0, NULL, NULL);
- }
#endif
+ }
return (error);
}
diff --git a/sys/netinet/tcp_usrreq.c b/sys/netinet/tcp_usrreq.c
--- a/sys/netinet/tcp_usrreq.c
+++ b/sys/netinet/tcp_usrreq.c
@@ -3008,6 +3008,10 @@
db_printf("%sTF2_ACE_PERMIT", comma ? ", " : "");
comma = 1;
}
+ if (t_flags2 & TF2_ECN_PLUSPLUS) {
+ db_printf("%sTF2_ECN_PLUSPLUS", comma ? ", " : "");
+ comma = 1;
+ }
if (t_flags2 & TF2_FBYTES_COMPLETE) {
db_printf("%sTF2_FBYTES_COMPLETE", comma ? ", " : "");
comma = 1;
diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h
--- a/sys/netinet/tcp_var.h
+++ b/sys/netinet/tcp_var.h
@@ -843,6 +843,7 @@
#define TF2_MBUF_QUEUE_READY 0x00020000 /* Inputs can be queued */
#define TF2_DONT_SACK_QUEUE 0x00040000 /* Don't wake on sack */
#define TF2_CANNOT_DO_ECN 0x00080000 /* The stack does not do ECN */
+#define TF2_ECN_PLUSPLUS 0x00100000 /* ECN++ session */
/*
* Structure to hold TCP options that are only used during segment
@@ -1273,6 +1274,7 @@
VNET_DECLARE(int, tcp_do_sack);
VNET_DECLARE(int, tcp_do_tso);
VNET_DECLARE(int, tcp_ecn_maxretries);
+VNET_DECLARE(int, tcp_ecn_generalized);
VNET_DECLARE(int, tcp_initcwnd_segments);
VNET_DECLARE(int, tcp_insecure_rst);
VNET_DECLARE(int, tcp_insecure_syn);
@@ -1319,6 +1321,7 @@
#define V_tcp_do_sack VNET(tcp_do_sack)
#define V_tcp_do_tso VNET(tcp_do_tso)
#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
+#define V_tcp_ecn_generalized VNET(tcp_ecn_generalized)
#define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments)
#define V_tcp_insecure_rst VNET(tcp_insecure_rst)
#define V_tcp_insecure_syn VNET(tcp_insecure_syn)

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