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Fix the handling of TCP FIN-segments in the CLOSED state

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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.

Reviewed by:		hiren
MFC after:		1 month
Sponsored by:		Netflix, Inc.
Differential Revision:	https://svn.freebsd.org/base/head
This commit is contained in:
Michael Tuexen 2016-12-02 08:02:31 +00:00
parent d6d35f1561
commit 4ddd5aadea
1 changed files with 2 additions and 0 deletions
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2
sys/netinet/tcp_input.c
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@ -3357,6 +3357,8 @@ tcp_dropwithreset(struct mbuf *m, struct tcphdr *th, struct tcpcb *tp,
} 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);
}