// 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>
{
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
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