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tcp: improve behaviour when using TCP_NOOPT

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Use ISS for SEG.SEQ when sending a SYN-ACK segment in response to
an SYN segment received in the SYN-SENT state on a socket having
the IPPROTO_TCP level socket option TCP_NOOPT enabled.

Reviewed by:		rscheff
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D28656
This commit is contained in:
Michael Tuexen 2021-02-14 12:10:31 +01:00
parent 1bd44b11e5
commit ed782b9f5a
1 changed files with 4 additions and 1 deletions
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5
sys/netinet/tcp_output.c
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@ -785,6 +785,10 @@ tcp_output(struct tcpcb *tp)
#endif
hdrlen = sizeof (struct tcpiphdr);
if (flags & TH_SYN) {
tp->snd_nxt = tp->iss;
}
/*
* Compute options for segment.
* We only have to care about SYN and established connection
@ -795,7 +799,6 @@ tcp_output(struct tcpcb *tp)
if ((tp->t_flags & TF_NOOPT) == 0) {
/* Maximum segment size. */
if (flags & TH_SYN) {
tp->snd_nxt = tp->iss;
to.to_mss = tcp_mssopt(&tp->t_inpcb->inp_inc);
to.to_flags |= TOF_MSS;