X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/b84553c1d79a351e87d3b287822d0bf81b608f15..810e88371a3a238b859adff9969a1f16454d77ad:/ppp.c

diff --git a/ppp.c b/ppp.c
index d7770e5..6af5066 100644
--- a/ppp.c
+++ b/ppp.c
@@ -1,6 +1,6 @@
 // L2TPNS PPP Stuff
 
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.87 2005/12/04 13:06:50 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.91 2005/12/15 14:23:03 bodea Exp $";
 
 #include <stdio.h>
 #include <string.h>
@@ -449,6 +449,7 @@ static void ppp_code_rej(sessionidt s, tunnelidt t, uint16_t proto,
 {
 	uint8_t *q;
 	int mru = session[s].mru;
+	if (mru < MINMTU) mru = MINMTU;
 	if (mru > size) mru = size;
 
 	l += 4;
@@ -498,7 +499,9 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 	if (session[s].die) // going down...
 		return;
 
-	LOG(*p == EchoReq ? 4 : 3, s, t, "LCP: recv %s\n", ppp_code(*p));
+	LOG((*p == EchoReq || *p == EchoReply) ? 4 : 3, s, t,
+		"LCP: recv %s\n", ppp_code(*p));
+
 	if (config->debug > 3) dumplcp(p, l);
 
 	if (*p == ConfigAck)
@@ -577,7 +580,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 				case 1: // Maximum-Receive-Unit
 					{
 						uint16_t mru = ntohs(*(uint16_t *)(o + 2));
-						if (mru >= 576)
+						if (mru >= MINMTU)
 						{
 							session[s].mru = mru;
 							break;
@@ -793,6 +796,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
 
 				default:
 				    	LOG(2, s, t, "LCP: remote sent %s for type %u?\n", ppp_code(*p), type);
+					sessionshutdown(s, "Unable to negotiate LCP.", 3, 0);
 					break;
 			}
 			x -= length;
@@ -1754,9 +1758,7 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid
 {
 	if (size < 12) // Need more space than this!!
 	{
-		static int backtrace_count = 0;
 		LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);
-		log_backtrace(backtrace_count, 5)
 		return NULL;
 	}
 
@@ -1779,9 +1781,7 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid
 
 	if (l + 12 > size)
 	{
-		static int backtrace_count = 0;
 		LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, l + 12);
-		log_backtrace(backtrace_count, 5)
 		return NULL;
 	}
 
@@ -1877,3 +1877,33 @@ void sendccp(sessionidt s, tunnelidt t)
 	tunnelsend(b, (q - b) + 4 , t);
 	restart_timer(s, ccp);
 }
+
+// Reject unknown/unconfigured protocols
+void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto)
+{
+
+	uint8_t buf[MAXETHER];
+	uint8_t *q;
+	int mru = session[s].mru;
+	if (mru < MINMTU) mru = MINMTU;
+	if (mru > sizeof(buf)) mru = sizeof(buf);
+
+	l += 6;
+	if (l > mru) l = mru;
+
+	q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP);
+	if (!q) return;
+
+	*q = ProtocolRej;
+	*(q + 1) = ++sess_local[s].lcp_ident;
+	*(uint16_t *)(q + 2) = htons(l);
+	*(uint16_t *)(q + 4) = htons(proto);
+	memcpy(q + 6, p, l - 6);
+
+	if (proto == PPPIPV6CP)
+		LOG(3, s, t, "LCP: send ProtocolRej (IPV6CP: not configured)\n");
+	else
+		LOG(2, s, t, "LCP: sent ProtocolRej (0x%04X: unsupported)\n", proto);
+
+	tunnelsend(buf, l + (q - buf), t);
+}