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); _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
