This patch fixes the problem where the current TCP code can not handle
simultaneous open. Both the bug and the patch were verified using the ANVL test suite. PR: kern/74935 Submitted by: qingli (before I became committer) Reviewed by: andre MFC after: 5 days
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=155961
@ -1421,7 +1421,7 @@ tcp_input(m, off0)
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* SYN-SENT* -> SYN-RECEIVED*
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* If there was no CC option, clear cached CC value.
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*/
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tp->t_flags |= TF_ACKNOW;
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tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN);
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callout_stop(tp->tt_rexmt);
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tp->t_state = TCPS_SYN_RECEIVED;
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}
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@ -338,7 +338,8 @@ tcp_output(struct tcpcb *tp)
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* know that foreign host supports TAO, suppress sending segment.
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*/
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if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una)) {
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flags &= ~TH_SYN;
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if (tp->t_state != TCPS_SYN_RECEIVED)
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flags &= ~TH_SYN;
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off--, len++;
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}
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@ -1421,7 +1421,7 @@ tcp_input(m, off0)
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* SYN-SENT* -> SYN-RECEIVED*
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* If there was no CC option, clear cached CC value.
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*/
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tp->t_flags |= TF_ACKNOW;
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tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN);
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callout_stop(tp->tt_rexmt);
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tp->t_state = TCPS_SYN_RECEIVED;
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}
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