tcp: improve behaviour when using TCP_NOOPT
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
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@ -785,6 +785,10 @@ tcp_output(struct tcpcb *tp)
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#endif
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hdrlen = sizeof (struct tcpiphdr);
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if (flags & TH_SYN) {
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tp->snd_nxt = tp->iss;
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}
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/*
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* Compute options for segment.
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* We only have to care about SYN and established connection
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@ -795,7 +799,6 @@ tcp_output(struct tcpcb *tp)
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if ((tp->t_flags & TF_NOOPT) == 0) {
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/* Maximum segment size. */
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if (flags & TH_SYN) {
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tp->snd_nxt = tp->iss;
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to.to_mss = tcp_mssopt(&tp->t_inpcb->inp_inc);
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to.to_flags |= TOF_MSS;
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