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Sending TCP timestamp option in SYN packets

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TCP timestamps were only sent if the remote side
requested it first. This enables the use of timestamps
for outgoing connections as well.

Signed-off-by: goldsimon <goldsimon@gmx.de>
This commit is contained in:
Jakub Schmidtke 2017-06-19 13:30:45 -04:00 committed by goldsimon
parent faf74b36a4
commit 112e370457
1 changed files with 3 additions and 3 deletions
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6
src/core/tcp_out.c
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@ -835,9 +835,9 @@ tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags)
#endif /* LWIP_WND_SCALE */ #endif /* LWIP_WND_SCALE */
} }
#if LWIP_TCP_TIMESTAMPS #if LWIP_TCP_TIMESTAMPS
if ((pcb->flags & TF_TIMESTAMP)) { if ((pcb->flags & TF_TIMESTAMP) || ((flags & TCP_SYN) && (pcb->state != SYN_RCVD))) {
/* Make sure the timestamp option is only included in data segments if we /* The timestamp option is only included in SYN packets,
agreed about it with the remote host. */ * and in data segments if we agreed about it with the remote host. */
optflags |= TF_SEG_OPTS_TS; optflags |= TF_SEG_OPTS_TS;
} }
#endif /* LWIP_TCP_TIMESTAMPS */ #endif /* LWIP_TCP_TIMESTAMPS */