Date: Sun, 18 Dec 2016 12:27:35 +0000 (UTC) From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r310213 - stable/11/sys/netinet Message-ID: <201612181227.uBICRZQJ058272@repo.freebsd.org>
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Author: tuexen Date: Sun Dec 18 12:27:35 2016 New Revision: 310213 URL: https://svnweb.freebsd.org/changeset/base/310213 Log: MFC r309397: Fix the handling of TCP FIN-segments in the CLOSED state When a TCP segment with the FIN bit set was received in the CLOSED state, a TCP RST-ACK-segment is sent. When computing SEG.ACK for this, the FIN counts as one byte. This accounting was missing and is fixed by this patch. Sponsored by: Netflix, Inc. Modified: stable/11/sys/netinet/tcp_input.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/netinet/tcp_input.c ============================================================================== --- stable/11/sys/netinet/tcp_input.c Sun Dec 18 12:23:48 2016 (r310212) +++ stable/11/sys/netinet/tcp_input.c Sun Dec 18 12:27:35 2016 (r310213) @@ -3316,6 +3316,8 @@ tcp_dropwithreset(struct mbuf *m, struct } else { if (th->th_flags & TH_SYN) tlen++; + if (th->th_flags & TH_FIN) + tlen++; tcp_respond(tp, mtod(m, void *), th, m, th->th_seq+tlen, (tcp_seq)0, TH_RST|TH_ACK); }
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