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Clamp MSS to the MTU of the source only #68

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Clamp MSS to the MTU of the source only #68

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6 changes: 1 addition & 5 deletions src/route.c
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Original file line number Diff line number Diff line change
Expand Up @@ -109,10 +109,6 @@ static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *pac
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 = ether_size;
uint16_t type = DATA(packet)[12] << 8 | DATA(packet)[13];
Expand Down Expand Up @@ -163,7 +159,7 @@ static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *pac

/* Found it */
uint16_t oldmss = DATA(packet)[start + 22 + i] << 8 | DATA(packet)[start + 23 + i];
uint16_t newmss = mtu - start - 20;
uint16_t newmss = source->mtu - start - 20;
uint16_t csum = DATA(packet)[start + 16] << 8 | DATA(packet)[start + 17];

if(oldmss <= newmss)
Expand Down