Author: tuexen Date: Sun Mar 8 14:48:32 2020 New Revision: 358740 URL: https://svnweb.freebsd.org/changeset/base/358740
Log: MFC r358614: Don't send an uninitialised 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 Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D23900 Modified: stable/11/sys/netinet/tcp_syncache.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/netinet/tcp_syncache.c ============================================================================== --- stable/11/sys/netinet/tcp_syncache.c Sun Mar 8 14:48:21 2020 (r358739) +++ stable/11/sys/netinet/tcp_syncache.c Sun Mar 8 14:48:32 2020 (r358740) @@ -1679,7 +1679,8 @@ syncache_respond(struct syncache *sc, struct syncache_ 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); _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "[email protected]"
