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tcp: no data on SYN segments unless doing TFO

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Ensure that there is no data on SYN segments unless doing TFO.
This check is already in RACK and BBR.

Reported by:		glebius
Reviewed by:		rscheff
MFC after:		1 week
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D44384
This commit is contained in:
Michael Tuexen 2024-03-22 11:12:56 +01:00
parent 88f557a2a9
commit af700f430f
1 changed files with 6 additions and 0 deletions
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6
sys/netinet/tcp_output.c
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@ -470,6 +470,12 @@ tcp_default_output(struct tcpcb *tp)
(tp->t_tfo_client_cookie_len == 0)) ||
(flags & TH_RST)))
len = 0;
/* Without fast-open there should never be data sent on a SYN. */
if ((flags & TH_SYN) && !(tp->t_flags & TF_FASTOPEN)) {
len = 0;
}
if (len <= 0) {
/*
* If FIN has been sent but not acked,