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TCP window scaling: don't parse window scaling option on retransmission

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This commit is contained in:
goldsimon 2015-08-28 11:23:24 +02:00
parent 367ac04ed8
commit 98f98048bc
1 changed files with 3 additions and 3 deletions
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6
src/core/tcp_in.c
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@ -1714,10 +1714,10 @@ tcp_parseopt(struct tcp_pcb *pcb)
return;
}
/* If syn was received with wnd scale option,
activate wnd scale opt */
data = tcp_getoptbyte();
if (flags & TCP_SYN) {
activate wnd scale opt, but only if this is not a retransmission */
if ((flags & TCP_SYN) && !(pcb->flags & TF_WND_SCALE)) {
/* An WND_SCALE option with the right option length. */
data = tcp_getoptbyte();
pcb->snd_scale = data;
if (pcb->snd_scale > 14U) {
pcb->snd_scale = 14U;