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This small fix makes it so we properly follow

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the RFC and only enable ECN when both the
CWR and ECT bits our set within the SYN packet.

Sponsored by:	Netflix Inc.
Differential Revision:	https://reviews.freebsd.org/D23645
This commit is contained in:
Randall Stewart 2020-02-12 13:04:19 +00:00
parent 3fba40d9f2
commit 596ae436ef
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357816
1 changed files with 2 additions and 1 deletions
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3
sys/netinet/tcp_syncache.c
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@ -1668,7 +1668,8 @@ syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
sc->sc_peer_mss = to->to_mss; /* peer mss may be zero */
if (ltflags & TF_NOOPT)
sc->sc_flags |= SCF_NOOPT;
if ((th->th_flags & (TH_ECE|TH_CWR)) && V_tcp_do_ecn)
if (((th->th_flags & (TH_ECE|TH_CWR)) == (TH_ECE|TH_CWR)) &&
V_tcp_do_ecn)
sc->sc_flags |= SCF_ECN;
if (V_tcp_syncookies)