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author | Andre Oppermann <andre@FreeBSD.org> | 2012-10-28 17:30:28 +0000 |
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committer | Andre Oppermann <andre@FreeBSD.org> | 2012-10-28 17:30:28 +0000 |
commit | 4249614cb0e406e9e635b184b21b6fb3c4ec29a0 (patch) | |
tree | 2698263342eaa460adf32dedbaa1ae0896d8dce1 | |
parent | cf8f04f4c0328ef2386b561d705b6a0f6e3129f5 (diff) | |
download | src-4249614cb0e406e9e635b184b21b6fb3c4ec29a0.tar.gz src-4249614cb0e406e9e635b184b21b6fb3c4ec29a0.zip |
When SYN or SYN/ACK had to be retransmitted RFC5681 requires us to
reduce the initial CWND to one segment. This reduction got lost
some time ago due to a change in initialization ordering.
Additionally in tcp_timer_rexmt() avoid entering fast recovery when
we're still in TCPS_SYN_SENT state.
MFC after: 2 weeks
Notes
Notes:
svn path=/head/; revision=242251
-rw-r--r-- | sys/netinet/tcp_output.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c index e1d9f11a91b3..3a6ae9c181b1 100644 --- a/sys/netinet/tcp_output.c +++ b/sys/netinet/tcp_output.c @@ -551,10 +551,14 @@ after_sack_rexmit: * max size segments, or at least 50% of the maximum possible * window, then want to send a window update to peer. * Skip this if the connection is in T/TCP half-open state. - * Don't send pure window updates when the peer has closed - * the connection and won't ever send more data. + * + * Don't send an independent window update if a delayed + * ACK is pending (it will get piggy-backed on it) or the + * remote side already has done a half-close and won't send + * more data. */ if (recwin > 0 && !(tp->t_flags & TF_NEEDSYN) && + !(tp->t_flags & TF_DELACK) && !TCPS_HAVERCVDFIN(tp->t_state)) { /* * "adv" is the amount we can increase the window, |