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| author | zml <zml@FreeBSD.org> | 2009-05-27 17:02:10 +0000 |
|---|---|---|
| committer | zml <zml@FreeBSD.org> | 2009-05-27 17:02:10 +0000 |
| commit | 8adb24b1afca95806f41c172c2ebe8af16123122 (patch) | |
| tree | 488c3ea0a193daecc6bddc2d4c0fa1b164a5372f /sys/netinet/tcp_input.c | |
| parent | b186e91180da0abaa602da3390c0d96d447be697 (diff) | |
| download | FreeBSD-src-8adb24b1afca95806f41c172c2ebe8af16123122.zip FreeBSD-src-8adb24b1afca95806f41c172c2ebe8af16123122.tar.gz | |
Correct handling of SYN packets that are to the left of the current window of an ESTABLISHED connection.
Reviewed by: net@, gnn
Approved by: dfr (mentor)
Diffstat (limited to 'sys/netinet/tcp_input.c')
| -rw-r--r-- | sys/netinet/tcp_input.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index d4a9f70..bbf5d8f 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -1818,7 +1818,11 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, todrop = tp->rcv_nxt - th->th_seq; if (todrop > 0) { - if (thflags & TH_SYN) { + /* + * If this is a duplicate SYN for our current connection, + * advance over it and pretend and it's not a SYN. + */ + if (thflags & TH_SYN && th->th_seq == tp->irs) { thflags &= ~TH_SYN; th->th_seq++; if (th->th_urp > 1) |
