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Clamp MSS to miminum MTU in both directions.

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Clamp MSS of both incoming and outgoing packets, and use the minimum of the
PMTU of both directions when clamping.
This commit is contained in:
Guus Sliepen 2010-02-28 18:20:13 +01:00
parent ddb8cb0779
commit 3cb91d75f8
1 changed files with 6 additions and 2 deletions
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8
src/route.c
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@ -94,9 +94,13 @@ static bool checklength(node_t *source, vpn_packet_t *packet, length_t length) {
}
static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *packet) {
if(!via || via == myself || !(via->options & OPTION_CLAMP_MSS))
if(!source || !via || !(via->options & OPTION_CLAMP_MSS))
return;
uint16_t mtu = source->mtu;
if(via != myself && via->mtu < mtu)
mtu = via->mtu;
/* Find TCP header */
int start = 0;
uint16_t type = packet->data[12] << 8 | packet->data[13];
@ -140,7 +144,7 @@ static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *pac
/* Found it */
uint16_t oldmss = packet->data[start + 22 + i] << 8 | packet->data[start + 23 + i];
uint16_t newmss = via->mtu - start - 20;
uint16_t newmss = mtu - start - 20;
uint16_t csum = packet->data[start + 16] << 8 | packet->data[start + 17];
if(oldmss <= newmss)