X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/59706a53940c8d2a17f36f30d4d54b6042dfe229..3e92edac6a72ab10310f55abf54d7588cd993c4b:/ppp.c?ds=sidebyside

diff --git a/ppp.c b/ppp.c
index 62e16e8..92349e4 100644
--- a/ppp.c
+++ b/ppp.c
@@ -1,6 +1,6 @@
 // L2TPNS PPP Stuff
 
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.80 2005/09/13 14:23:07 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.82 2005/09/16 05:04:29 bodea Exp $";
 
 #include <stdio.h>
 #include <string.h>
@@ -449,8 +449,6 @@ static void ppp_code_rej(sessionidt s, tunnelidt t, uint16_t proto,
 {
 	uint8_t *q;
 	int mru = session[s].mru;
-
-	if (!mru) mru = MAXMRU;
 	if (mru > size) mru = size;
 
 	l += 4;
@@ -738,12 +736,12 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 				case 1: // Maximum-Receive-Unit
 					if (*p == ConfigNak)
 					{
-						session[s].mru = ntohs(*(uint16_t *)(o + 2));
-						LOG(3, s, t, "    Remote requested MRU of %u\n", session[s].mru);
+						sess_local[s].ppp_mru = ntohs(*(uint16_t *)(o + 2));
+						LOG(3, s, t, "    Remote requested MRU of %u\n", sess_local[s].ppp_mru);
 					}
 					else
 					{
-						session[s].mru = 0;
+						sess_local[s].ppp_mru = 0;
 						LOG(3, s, t, "    Remote rejected MRU negotiation\n");
 					}
 
@@ -1337,6 +1335,13 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 
 	LOG_HEX(5, "IP", p, l);
 
+	if (l < 20 || l < ntohl(*(uint32_t *)(p + 2)))
+	{
+		LOG(1, s, t, "IP packet too short %d\n", l);
+		STAT(tunnel_rx_errors);
+		return ;
+	}
+
 	ip = ntohl(*(uint32_t *)(p + 12));
 
 	if (l > MAXETHER)
@@ -1360,6 +1365,14 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 	if (session[s].filter_in && !ip_filter(p, l, session[s].filter_in - 1))
 		return;
 
+	// adjust MSS on SYN and SYN,ACK packets with options
+	if ((ntohs(*(uint16_t *) (p + 6)) & 0x1fff) == 0 && p[9] == IPPROTO_TCP) // first tcp fragment
+	{
+		int ihl = (p[0] & 0xf) * 4; // length of IP header
+		if (l >= ihl + 20 && (p[ihl + 13] & TCP_FLAG_SYN) && ((p[ihl + 12] >> 4) > 5))
+			adjust_tcp_mss(s, t, p, l, p + ihl);
+	}
+
 	// Add on the tun header
 	p -= 4;
 	*(uint32_t *) p = htonl(PKTIP);
@@ -1807,10 +1820,10 @@ void sendlcp(sessionidt s, tunnelidt t)
 
 	l += 2; //Save space for length
 
-	if (session[s].mru)
+	if (sess_local[s].ppp_mru)
 	{
 		*l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4)
-		*(uint16_t *) l = htons(session[s].mru); l += 2;
+		*(uint16_t *) l = htons(sess_local[s].ppp_mru); l += 2;
 	}
 
 	if (authtype)