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| author | Michael Tuexen <tuexen@FreeBSD.org> | 2021-03-22 14:58:49 +0000 |
|---|---|---|
| committer | Michael Tuexen <tuexen@FreeBSD.org> | 2021-06-02 21:20:26 +0000 |
| commit | 15077bc4b91fc9c98eb5cd743d8386de2d3c1336 (patch) | |
| tree | 68a104e72263de8919e29d92aa7ce5ce17016c31 /sys/netinet/tcp_input.c | |
| parent | 7a9c6cbae91307b152f45a3d38c9a3f895c53f66 (diff) | |
| download | src-15077bc4b91fc9c98eb5cd743d8386de2d3c1336.tar.gz src-15077bc4b91fc9c98eb5cd743d8386de2d3c1336.zip | |
tcp: improve handling of SYN segments in SYN-SENT state
Ensure that the stack does not generate a DSACK block for user
data received on a SYN segment in SYN-SENT state.
Reviewed by: rscheff
Differential Revision: https://reviews.freebsd.org/D29376
Sponsored by: Netflix, Inc.
(cherry picked from commit 40f41ece765dc0b0907ca90796a1af4f4f89b2a0)
Diffstat (limited to 'sys/netinet/tcp_input.c')
| -rw-r--r-- | sys/netinet/tcp_input.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index b3d4ef5cf5de..397cbc5084e6 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -3157,7 +3157,9 @@ dodata: /* XXX */ thflags = tcp_reass(tp, th, &temp, &tlen, m); tp->t_flags |= TF_ACKNOW; } - if ((tp->t_flags & TF_SACK_PERMIT) && (save_tlen > 0)) { + if ((tp->t_flags & TF_SACK_PERMIT) && + (save_tlen > 0) && + TCPS_HAVEESTABLISHED(tp->t_state)) { if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) { /* * DSACK actually handled in the fastpath |