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tcp_in.c: Fix bug #20126 : Zero ssthresh bug (by Per-Henrik Lundblom and Kieran Mansley).
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@ -701,12 +701,18 @@ tcp_receive(struct tcp_pcb *pcb)
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/*pcb->ssthresh = LWIP_MAX((pcb->snd_max -
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/*pcb->ssthresh = LWIP_MAX((pcb->snd_max -
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pcb->lastack) / 2,
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pcb->lastack) / 2,
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2 * pcb->mss);*/
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2 * pcb->mss);*/
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/* Set ssthresh to half of the minimum of the currenct cwnd and the advertised window */
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/* Set ssthresh to half of the minimum of the current cwnd and the advertised window */
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if (pcb->cwnd > pcb->snd_wnd)
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if (pcb->cwnd > pcb->snd_wnd)
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pcb->ssthresh = pcb->snd_wnd / 2;
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pcb->ssthresh = pcb->snd_wnd / 2;
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else
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else
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pcb->ssthresh = pcb->cwnd / 2;
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pcb->ssthresh = pcb->cwnd / 2;
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/* The minimum value for ssthresh should be 2 MSS */
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if (pcb->ssthresh < 2*pcb->mss) {
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LWIP_DEBUGF(TCP_FR_DEBUG, ("tcp_receive: The minimum value for ssthresh %"U16_F" should be min 2 mss %"U16_F"...\n", pcb->ssthresh, 2*pcb->mss));
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pcb->ssthresh = 2*pcb->mss;
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}
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pcb->cwnd = pcb->ssthresh + 3 * pcb->mss;
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pcb->cwnd = pcb->ssthresh + 3 * pcb->mss;
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pcb->flags |= TF_INFR;
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pcb->flags |= TF_INFR;
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} else {
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} else {
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