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bodea 2005-09-16 05:35:31 +00:00
parent cbb16f7b0b
commit 082daad80b
1 changed files with 10 additions and 9 deletions
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19
l2tpns.c
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@ -4,7 +4,7 @@
// Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
// vim: sw=8 ts=8
char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.134 2005/09/16 05:30:30 bodea Exp $";
char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.135 2005/09/16 05:35:31 bodea Exp $";
#include <arpa/inet.h>
#include <assert.h>
@ -988,6 +988,7 @@ void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *t
{
int d = (tcp[12] >> 4) * 4;
uint8_t *mss = 0;
uint8_t *opts;
uint8_t *data;
if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
@ -996,23 +997,23 @@ void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *t
if (tcp + d > buf + len) // short?
return;
opts = tcp + 20;
data = tcp + d;
tcp += 20;
while (tcp < data)
while (opts < data)
{
if (*tcp == 2 && tcp[1] == 4) // mss option (2), length 4
if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
{
mss = tcp + 2;
mss = opts + 2;
if (mss + 2 > data) return; // short?
break;
}
if (*tcp == 0) return; // end of options
if (*tcp == 1 || !tcp[1]) // no op (one byte), or no length (prevent loop)
tcp++;
if (*opts == 0) return; // end of options
if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
opts++;
else
tcp += tcp[1]; // skip over option
opts += opts[1]; // skip over option
}
if (!mss) return; // not found