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Make MSS clamping configurable, but enabled by default.

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It can either be set globally in tinc.conf, or per-node in host config files.
This commit is contained in:
Guus Sliepen 2010-01-16 20:16:33 +01:00
parent 95928f7c29
commit b455111184
6 changed files with 35 additions and 1 deletions
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5
src/route.c
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@ -94,7 +94,7 @@ 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)
if(!via || via == myself || !(via->options & OPTION_CLAMP_MSS))
return;
/* Find TCP header */
@ -112,6 +112,9 @@ static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *pac
/* Use data offset field to calculate length of options field */
int len = ((packet->data[start + 12] >> 4) - 5) * 4;
if(packet->len < start + 20 + len)
return;
/* Search for MSS option header */
for(int i = 0; i < len;) {
if(packet->data[start + 20 + i] == 0)