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Index: head/sys/netinet/tcp_syncache.c
===================================================================
--- head/sys/netinet/tcp_syncache.c
+++ head/sys/netinet/tcp_syncache.c
@@ -510,6 +510,9 @@
sch->sch_nextc = sc->sc_rxttime;
continue;
}
+ if (sc->sc_rxmits > V_tcp_ecn_maxretries) {
+ sc->sc_flags &= ~SCF_ECN;
+ }
if (sc->sc_rxmits > V_tcp_syncache.rexmt_limit) {
if ((s = tcp_log_addrs(&sc->sc_inc, NULL, NULL, NULL))) {
log(LOG_DEBUG, "%s; %s: Retransmits exhausted, "
@@ -1505,6 +1508,13 @@
sc->sc_tsreflect = to->to_tsval;
else
sc->sc_flags &= ~SCF_TIMESTAMP;
+ /*
+ * Disable ECN if needed.
+ */
+ if ((sc->sc_flags & SCF_ECN) &&
+ ((th->th_flags & (TH_ECE|TH_CWR)) != (TH_ECE|TH_CWR))) {
+ sc->sc_flags &= ~SCF_ECN;
+ }
#ifdef MAC
/*
* Since we have already unconditionally allocated label

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