Author: zml
Date: Wed May 27 17:02:10 2009
New Revision: 192912
URL: http://svn.freebsd.org/changeset/base/192912
Log:
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)
Modified:
head/sys/netinet/tcp_input.c
Modified: head/sys/netinet/tcp_input.c
==============================================================================
--- head/sys/netinet/tcp_input.c Wed May 27 17:01:59 2009
(r192911)
+++ head/sys/netinet/tcp_input.c Wed May 27 17:02:10 2009
(r192912)
@@ -1818,7 +1818,11 @@ tcp_do_segment(struct mbuf *m, struct tc
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)
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