svn commit: r358614 - head/sys/netinet
Michael Tuexen
tuexen at FreeBSD.org
Wed Mar 4 12:22:54 UTC 2020
Author: tuexen
Date: Wed Mar 4 12:22:53 2020
New Revision: 358614
URL: https://svnweb.freebsd.org/changeset/base/358614
Log:
Don't send an uninitilised traffic class in the IPv6 header, when
sending a TCP segment from the TCP SYN cache (like a SYN-ACK).
This fix initialises it to zero. This is correct for the ECN bits,
but is does not honor the DSCP what an application might have set via
the IPPROTO_IPV6 level socket options IPV6_TCLASS. That will be
fixed separately.
Reviewed by: Richard Scheffenegger
MFC after: 3 days
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D23900
Modified:
head/sys/netinet/tcp_syncache.c
Modified: head/sys/netinet/tcp_syncache.c
==============================================================================
--- head/sys/netinet/tcp_syncache.c Wed Mar 4 12:21:38 2020 (r358613)
+++ head/sys/netinet/tcp_syncache.c Wed Mar 4 12:22:53 2020 (r358614)
@@ -1794,7 +1794,8 @@ syncache_respond(struct syncache *sc, const struct mbu
ip6->ip6_dst = sc->sc_inc.inc6_faddr;
ip6->ip6_plen = htons(tlen - hlen);
/* ip6_hlim is set after checksum */
- ip6->ip6_flow &= ~IPV6_FLOWLABEL_MASK;
+ /* Zero out traffic class and flow label. */
+ ip6->ip6_flow &= ~IPV6_FLOWINFO_MASK;
ip6->ip6_flow |= sc->sc_flowlabel;
th = (struct tcphdr *)(ip6 + 1);
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