X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/3aa4eda8b1e0c4abc04439affe850d33648c7472..4554641760c2efefb85661006c3c60ad99d9e7e1:/radius.c

diff --git a/radius.c b/radius.c
index ee364b2..38b1f22 100644
--- a/radius.c
+++ b/radius.c
@@ -1,5 +1,6 @@
 // L2TPNS Radius Stuff
-// $Id: radius.c,v 1.1 2003/12/16 07:07:39 fred_nerk Exp $
+
+char const *cvs_id_radius = "$Id: radius.c,v 1.20.2.2 2005/05/03 05:10:52 bodea Exp $";
 
 #include <time.h>
 #include <stdio.h>
@@ -7,6 +8,7 @@
 #include <sys/socket.h>
 #include <malloc.h>
 #include <string.h>
+#include <fcntl.h>
 #include <arpa/inet.h>
 #include <ctype.h>
 #include <netinet/in.h>
@@ -16,22 +18,14 @@
 #include "plugin.h"
 #include "util.h"
 
-extern char *radiussecret;
 extern radiust *radius;
 extern sessiont *session;
 extern tunnelt *tunnel;
-extern ipt radiusserver[MAXRADSERVER]; // radius servers
-extern u32 sessionid;
-extern u8 radiusfree;
-extern int radfd;
-extern u8 numradiusservers;
-extern char debug;
-extern unsigned long default_dns1, default_dns2;
-extern struct Tstats *_statistics;
-extern int radius_accounting;
-extern uint32_t bind_address;
-
-const char *radius_state(int state)
+extern configt *config;
+extern int *radfds;
+extern ip_filtert *ip_filters;
+
+static const char *radius_state(int state)
 {
 	static char *tmp = NULL;
 	int i;
@@ -46,60 +40,99 @@ const char *radius_state(int state)
 // Set up socket for radius requests
 void initrad(void)
 {
-	radfd = socket(AF_INET, SOCK_DGRAM, UDP);
+	int i;
+	LOG(3, 0, 0, "Creating %d sockets for RADIUS queries\n", config->num_radfds);
+	radfds = calloc(sizeof(int), config->num_radfds);
+	for (i = 0; i < config->num_radfds; i++)
+	{
+		int flags;
+		radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+		flags = fcntl(radfds[i], F_GETFL, 0);
+		fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK);
+	}
 }
 
-void radiusclear(u8 r, sessionidt s)
+void radiusclear(uint16_t r, sessionidt s)
 {
-	radius[r].state = RADIUSNULL;
 	if (s) session[s].radius = 0;
-	memset(&radius[r], 0, sizeof(radius[r]));
-	radius[r].next = radiusfree;
-	radiusfree = r;
+	memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
+}
+
+
+static uint16_t get_free_radius()
+{
+	int count;
+	static uint32_t next_radius_id = 0;
+
+	for (count = MAXRADIUS; count > 0 ; --count)
+	{
+		++next_radius_id;		// Find the next ID to check.
+		if (next_radius_id >= MAXRADIUS)
+			next_radius_id = 1;
+
+		if (radius[next_radius_id].state == RADIUSNULL)
+		{
+			return next_radius_id;
+		}
+	}
+
+	LOG(0, 0, 0, "Can't find a free radius session! This is very bad!\n");
+	return 0;
 }
 
-u8 radiusnew(sessionidt s)
+uint16_t radiusnew(sessionidt s)
 {
-	u8 r;
-	if (!radiusfree)
+	uint16_t r = session[s].radius;
+
+	/* re-use */
+	if (r)
 	{
-		log(1, 0, s, session[s].tunnel, "No free RADIUS sessions\n");
+		LOG(3, s, session[s].tunnel, "Re-used radius %d\n", r);
+		return r;
+	}
+
+	if (!(r = get_free_radius()))
+	{
+		LOG(1, s, session[s].tunnel, "No free RADIUS sessions\n");
 		STAT(radius_overflow);
 		return 0;
 	};
-	r = radiusfree;
-	session[s].radius = r;
-	radiusfree = radius[r].next;
+
 	memset(&radius[r], 0, sizeof(radius[r]));
+	session[s].radius = r;
 	radius[r].session = s;
+	radius[r].state = RADIUSWAIT;
+	radius[r].retry = TIME + 1200; // Wait at least 120 seconds to re-claim this.
+
+	LOG(3, s, session[s].tunnel, "Allocated radius %d\n", r);
 	return r;
 }
 
 // Send a RADIUS request
-void radiussend(u8 r, u8 state)
+void radiussend(uint16_t r, uint8_t state)
 {
 	struct sockaddr_in addr;
-	u8 b[4096];            // RADIUS packet
+	uint8_t b[4096];            // RADIUS packet
 	char pass[129];
 	int pl;
-	u8 *p;
+	uint8_t *p;
 	sessionidt s;
-#ifdef STAT_CALLS
-	STAT(call_radiussend);
-#endif
-	if (!numradiusservers)
+
+	CSTAT(call_radiussend);
+
+	s = radius[r].session;
+	if (!config->numradiusservers)
 	{
-		log(0, 0, 0, 0, "No RADIUS servers\n");
+		LOG(0, s, session[s].tunnel, "No RADIUS servers\n");
 		return;
 	}
-	if (!radiussecret)
+	if (!*config->radiussecret)
 	{
-		log(0, 0, 0, 0, "No RADIUS secret\n");
+		LOG(0, s, session[s].tunnel, "No RADIUS secret\n");
 		return;
 	}
-	s = radius[r].session;
 
-	if (state != RADIUSAUTH && !radius_accounting)
+	if (state != RADIUSAUTH && !config->radius_accounting)
 	{
 		// Radius accounting is turned off
 		radiusclear(r, s);
@@ -110,12 +143,22 @@ void radiussend(u8 r, u8 state)
 		radius[r].try = 0;
 	radius[r].state = state;
 	radius[r].retry = backoff(radius[r].try++);
-	log(4, 0, s, session[s].tunnel, "Send RADIUS %d state %s try %d\n", r, radius_state(radius[r].state), radius[r].try);
-	if (radius[r].try > numradiusservers * 2)
+	LOG(4, s, session[s].tunnel, "Send RADIUS id %d sock %d state %s try %d\n",
+		r >> RADIUS_SHIFT, r & RADIUS_MASK,
+		radius_state(radius[r].state), radius[r].try);
+
+	if (radius[r].try > config->numradiusservers * 2)
 	{
 		if (s)
 		{
-			sessionshutdown(s, "RADIUS timeout");
+			if (state == RADIUSAUTH)
+				sessionshutdown(s, "RADIUS timeout");
+			else
+			{
+				LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
+					radius_states[state]);
+				radiusclear(r, s);
+			}
 			STAT(radius_timeout);
 		}
 		else
@@ -129,17 +172,17 @@ void radiussend(u8 r, u8 state)
 	// contruct RADIUS access request
 	switch (state)
 	{
-	case RADIUSAUTH:
-		b[0] = 1;               // access request
-		break;
-	case RADIUSSTART:
-	case RADIUSSTOP:
-		b[0] = 4;               // accounting request
-		break;
-	default:
-		log(0, 0, 0, 0, "Unknown radius state %d\n", state);
+		case RADIUSAUTH:
+			b[0] = 1;               // access request
+			break;
+		case RADIUSSTART:
+		case RADIUSSTOP:
+			b[0] = 4;               // accounting request
+			break;
+		default:
+			LOG(0, 0, 0, "Unknown radius state %d\n", state);
 	}
-	b[1] = r;                    // identifier
+	b[1] = r >> RADIUS_SHIFT;       // identifier
 	memcpy(b + 4, radius[r].auth, 16);
 	p = b + 20;
 	if (s)
@@ -177,7 +220,7 @@ void radiussend(u8 r, u8 state)
 				{
 					MD5_CTX ctx;
 					MD5Init(&ctx);
-					MD5Update(&ctx, radiussecret, strlen(radiussecret));
+					MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
 					if (p)
 						MD5Update(&ctx, pass + p - 16, 16);
 					else
@@ -202,7 +245,7 @@ void radiussend(u8 r, u8 state)
 	{                          // accounting
 		*p = 40;                // accounting type
 		p[1] = 6;
-		*(u32 *) (p + 2) = htonl((state == RADIUSSTART) ? 1 : 2);
+		*(uint32_t *) (p + 2) = htonl((state == RADIUSSTART) ? 1 : 2);
 		p += p[1];
 		if (s)
 		{
@@ -214,30 +257,42 @@ void radiussend(u8 r, u8 state)
 			{                // stop
 				*p = 42;      // input octets
 				p[1] = 6;
-				*(u32 *) (p + 2) = htonl(session[s].cin);
+				*(uint32_t *) (p + 2) = htonl(session[s].cin);
 				p += p[1];
 				*p = 43;      // output octets
 				p[1] = 6;
-				*(u32 *) (p + 2) = htonl(session[s].cout);
+				*(uint32_t *) (p + 2) = htonl(session[s].cout);
 				p += p[1];
 				*p = 46;      // session time
 				p[1] = 6;
-				*(u32 *) (p + 2) = htonl(time(NULL) - session[s].opened);
+				*(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
 				p += p[1];
 				*p = 47;      // input packets
 				p[1] = 6;
-				*(u32 *) (p + 2) = htonl(session[s].pin);
+				*(uint32_t *) (p + 2) = htonl(session[s].pin);
 				p += p[1];
 				*p = 48;      // output spackets
 				p[1] = 6;
-				*(u32 *) (p + 2) = htonl(session[s].pout);
+				*(uint32_t *) (p + 2) = htonl(session[s].pout);
 				p += p[1];
 			}
 			else
 			{                // start
 				*p = 41;      // delay
 				p[1] = 6;
-				*(u32 *) (p + 2) = htonl(time(NULL) - session[s].opened);
+				*(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
+				p += p[1];
+			}
+
+			if (session[s].snoop_ip && session[s].snoop_port)
+			{
+				*p = 26;				// vendor-specific
+				*(uint32_t *) (p + 2) = htonl(9);	// Cisco
+				p[6] = 1;				// Cisco-Avpair
+				p[7] = 2 + sprintf(p + 8, "intercept=%s:%d",
+					fmtaddr(session[s].snoop_ip, 0), session[s].snoop_port);
+
+				p[1] = p[7] + 6;
 				p += p[1];
 			}
 		}
@@ -246,14 +301,14 @@ void radiussend(u8 r, u8 state)
 	{
 		*p = 5; // NAS-Port
 		p[1] = 6;
-		*(u32 *) (p + 2) = htonl(s);
+		*(uint32_t *) (p + 2) = htonl(s);
 		p += p[1];
 	}
 	if (s && session[s].ip)
 	{
 		*p = 8;			// Framed-IP-Address
 		p[1] = 6;
-		*(u32 *) (p + 2) = htonl(session[s].ip);
+		*(uint32_t *) (p + 2) = htonl(session[s].ip);
 		p += p[1];
 	}
 	if (*session[s].called)
@@ -280,11 +335,11 @@ void radiussend(u8 r, u8 state)
 	// NAS-IP-Address
 	*p = 4;
 	p[1] = 6;
-	*(u32 *)(p + 2) = bind_address;
+	*(uint32_t *)(p + 2) = config->bind_address;
 	p += p[1];
 
 	// All AVpairs added
-	*(u16 *) (b + 2) = htons(p - b);
+	*(uint16_t *) (b + 2) = htons(p - b);
 	if (state != RADIUSAUTH)
 	{
 	    // Build auth for accounting packet
@@ -295,52 +350,65 @@ void radiussend(u8 r, u8 state)
 	    MD5Update(&ctx, b, 4);
 	    MD5Update(&ctx, z, 16);
 	    MD5Update(&ctx, b + 20, (p - b) - 20);
-	    MD5Update(&ctx, radiussecret, strlen(radiussecret));
+	    MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
 	    MD5Final(hash, &ctx);
 	    memcpy(b + 4, hash, 16);
 	    memcpy(radius[r].auth, hash, 16);
 	}
 	memset(&addr, 0, sizeof(addr));
 	addr.sin_family = AF_INET;
-	*(u32 *) & addr.sin_addr = htonl(radiusserver[(radius[r].try - 1) % numradiusservers]);
-	addr.sin_port = htons((state == RADIUSAUTH) ? RADPORT : RADAPORT);
+	*(uint32_t *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
+	{
+		// get radius port
+		uint16_t port = config->radiusport[(radius[r].try - 1) % config->numradiusservers];
+		// no need to define the accounting port for itself:
+		//  the accounting port is as far as I know always one more
+		//  than the auth port    JK 20040713
+		addr.sin_port = htons((state == RADIUSAUTH) ? port : port+1);
+	}
 
-	log_hex(5, "RADIUS Send", b, (p - b));
-	sendto(radfd, b, p - b, 0, (void *) &addr, sizeof(addr));
+	LOG_HEX(5, "RADIUS Send", b, (p - b));
+	sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr));
 }
 
 // process RADIUS response
-void processrad(u8 * buf, int len)
+void processrad(uint8_t *buf, int len, char socket_index)
 {
-	u8 b[MAXCONTROL];
+	uint8_t b[MAXCONTROL];
 	MD5_CTX ctx;
-	u8 r;
+	uint16_t r;
 	sessionidt s;
 	tunnelidt t = 0;
 	hasht hash;
-	u8 routes = 0;
+	uint8_t routes = 0;
 
-#ifdef STAT_CALLS
-	STAT(call_processrad);
-#endif
-	log_hex(5, "RADIUS Response", buf, len);
-	if (len < 20 || len < ntohs(*(u16 *) (buf + 2)))
+	int r_code, r_id ; // Radius code.
+
+	r_code = buf[0]; // First byte in radius packet.
+	r_id = buf[1]; // radius reply indentifier.
+
+
+	CSTAT(call_processrad);
+
+	LOG_HEX(5, "RADIUS Response", buf, len);
+	if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
 	{
-		log(1, 0, 0, 0, "Duff RADIUS response length %d\n", len);
+		LOG(1, 0, 0, "Duff RADIUS response length %d\n", len);
 		return ;
 	}
-	len = ntohs(*(u16 *) (buf + 2));
-	r = buf[1];
+	len = ntohs(*(uint16_t *) (buf + 2));
+	r = socket_index | (r_id << RADIUS_SHIFT);
 	s = radius[r].session;
-	log(3, 0, s, session[s].tunnel, "Received %s, radius %d response for session %u\n", radius_states[radius[r].state], r, s);
+	LOG(3, s, session[s].tunnel, "Received %s, radius %d response for session %u (code %d, id %d)\n",
+			radius_states[radius[r].state], r, s, r_code, r_id);
 	if (!s && radius[r].state != RADIUSSTOP)
 	{
-		log(1, 0, s, session[s].tunnel, "   Unexpected RADIUS response\n");
+		LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response\n");
 		return;
 	}
 	if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART && radius[r].state != RADIUSSTOP)
 	{
-		log(1, 0, s, session[s].tunnel, "   Unexpected RADIUS response\n");
+		LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response\n");
 		return;
 	}
 	t = session[s].tunnel;
@@ -348,30 +416,30 @@ void processrad(u8 * buf, int len)
 	MD5Update(&ctx, buf, 4);
 	MD5Update(&ctx, radius[r].auth, 16);
 	MD5Update(&ctx, buf + 20, len - 20);
-	MD5Update(&ctx, radiussecret, strlen(radiussecret));
+	MD5Update(&ctx, config->radiussecret, strlen(config->radiussecret));
 	MD5Final(hash, &ctx);
 	do {
 		if (memcmp(hash, buf + 4, 16))
 		{
-			log(0, 0, s, session[s].tunnel, "   Incorrect auth on RADIUS response\n");
-			radius[r].state = RADIUSWAIT;
-			break;
+			LOG(0, s, session[s].tunnel, "   Incorrect auth on RADIUS response!! (wrong secret in radius config?)\n");
+			return; // Do nothing. On timeout, it will try the next radius server.
 		}
 		if ((radius[r].state == RADIUSAUTH && *buf != 2 && *buf != 3) ||
 			((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP) && *buf != 5))
 		{
-			log(1, 0, s, session[s].tunnel, "   Unexpected RADIUS response %d\n", *buf);
-			radius[r].state = RADIUSWAIT;
-			break;
+			LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response %d\n", *buf);
+			return; // We got something we didn't expect. Let the timeouts take
+				// care off finishing the radius session if that's really correct.
 		}
 		if (radius[r].state == RADIUSAUTH)
 		{
-			log(4, 0, s, session[s].tunnel, "   Original response is \"%s\"\n", (*buf == 2) ? "accept" : "reject");
+			LOG(4, s, session[s].tunnel, "   Original response is \"%s\"\n", (*buf == 2) ? "accept" : "reject");
 			// process auth response
 			if (radius[r].chap)
 			{
 				// CHAP
-				u8 *p = makeppp(b, 0, 0, t, s, PPPCHAP);
+				uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
+				if (!p) return;	// Abort!
 
 				{
 					struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPCHAP };
@@ -379,17 +447,18 @@ void processrad(u8 * buf, int len)
 					*buf = packet.auth_allowed ? 2 : 3;
 				}
 
-				log(3, 0, s, session[s].tunnel, "   CHAP User %s authentication %s.\n", session[s].user,
+				LOG(3, s, session[s].tunnel, "   CHAP User %s authentication %s.\n", session[s].user,
 						(*buf == 2) ? "allowed" : "denied");
 				*p = (*buf == 2) ? 3 : 4;     // ack/nak
 				p[1] = radius[r].id;
-				*(u16 *) (p + 2) = ntohs(4); // no message
+				*(uint16_t *) (p + 2) = ntohs(4); // no message
 				tunnelsend(b, (p - b) + 4, t); // send it
 			}
 			else
 			{
 				// PAP
-				u8 *p = makeppp(b, 0, 0, t, s, PPPPAP);
+				uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
+				if (!p) return;		// Abort!
 
 				{
 					struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPPAP };
@@ -397,12 +466,12 @@ void processrad(u8 * buf, int len)
 					*buf = packet.auth_allowed ? 2 : 3;
 				}
 
-				log(3, 0, s, session[s].tunnel, "   PAP User %s authentication %s.\n", session[s].user,
+				LOG(3, s, session[s].tunnel, "   PAP User %s authentication %s.\n", session[s].user,
 						(*buf == 2) ? "allowed" : "denied");
 				// ack/nak
 				*p = *buf;
 				p[1] = radius[r].id;
-				*(u16 *) (p + 2) = ntohs(5);
+				*(uint16_t *) (p + 2) = ntohs(5);
 				p[4] = 0; // no message
 				tunnelsend(b, (p - b) + 5, t); // send it
 			}
@@ -411,36 +480,46 @@ void processrad(u8 * buf, int len)
 			{
 				// Login successful
 				// Extract IP, routes, etc
-				u8 *p = buf + 20;
-				u8 *e = buf + len;
-				for (p = buf + 20; p < e && p[1]; p += p[1])
+				uint8_t *p = buf + 20;
+				uint8_t *e = buf + len;
+				for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1])
 				{
 					if (*p == 8)
 					{
-						// Statically assigned address
-						log(3, 0, s, session[s].tunnel, "   Radius reply contains IP address %s\n", inet_toa(*(u32 *) (p + 2)));
-						session[s].ip = ntohl(*(u32 *) (p + 2));
+						// Framed-IP-Address
+					    	if (p[1] < 6) continue;
+						session[s].ip = ntohl(*(uint32_t *) (p + 2));
+						session[s].ip_pool_index = -1;
+						LOG(3, s, session[s].tunnel, "   Radius reply contains IP address %s\n",
+							fmtaddr(htonl(session[s].ip), 0));
+
+						if (session[s].ip == 0xFFFFFFFE)
+							session[s].ip = 0; // assign from pool
 					}
 					else if (*p == 135)
 					{
 						// DNS address
-						log(3, 0, s, session[s].tunnel, "   Radius reply contains primary DNS address %s\n", inet_toa(ntohl(*(u32 *) (p + 2))));
-						session[s].dns1 = ntohl(*(u32 *) (p + 2));
+					    	if (p[1] < 6) continue;
+						session[s].dns1 = ntohl(*(uint32_t *) (p + 2));
+						LOG(3, s, session[s].tunnel, "   Radius reply contains primary DNS address %s\n",
+							fmtaddr(htonl(session[s].dns1), 0));
 					}
 					else if (*p == 136)
 					{
 						// DNS address
-						log(3, 0, s, session[s].tunnel, "   Radius reply contains secondary DNS address %s\n", inet_toa(ntohl(*(u32 *) (p + 2))));
-						session[s].dns2 = ntohl(*(u32 *) (p + 2));
+					    	if (p[1] < 6) continue;
+						session[s].dns2 = ntohl(*(uint32_t *) (p + 2));
+						LOG(3, s, session[s].tunnel, "   Radius reply contains secondary DNS address %s\n",
+							fmtaddr(htonl(session[s].dns2), 0));
 					}
 					else if (*p == 22)
 					{
-						// framed-route
-						ipt ip = 0, mask = 0;
-						u8 u = 0;
-						u8 bits = 0;
-						u8 *n = p + 2;
-						u8 *e = p + p[1];
+						// Framed-Route
+						in_addr_t ip = 0, mask = 0;
+						uint8_t u = 0;
+						uint8_t bits = 0;
+						uint8_t *n = p + 2;
+						uint8_t *e = p + p[1];
 						while (n < e && (isdigit(*n) || *n == '.'))
 						{
 							if (*n == '.')
@@ -466,107 +545,134 @@ void processrad(u8 * buf, int len)
 							mask = 0xFFFF0000;
 						else
 							mask = 0xFFFFFF00;
+
 						if (routes == MAXROUTE)
 						{
-							log(1, 0, s, session[s].tunnel, "   Too many routes\n");
+							LOG(1, s, session[s].tunnel, "   Too many routes\n");
 						}
-						else
+						else if (ip)
 						{
-							log(3, 0, s, session[s].tunnel, "   Radius reply contains route for %d/%d\n",
-									inet_toa(ip),
-									inet_toa(mask));
+							LOG(3, s, session[s].tunnel, "   Radius reply contains route for %s/%s\n",
+								fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1));
+							
 							session[s].route[routes].ip = ip;
 							session[s].route[routes].mask = mask;
 							routes++;
 						}
 					}
-					else if (*p == 26)
+					else if (*p == 11)
+					{
+					    	// Filter-Id
+					    	char *filter = p + 2;
+						int l = p[1] - 2;
+						char *suffix;
+						uint8_t *f = 0;
+						int i;
+
+						LOG(3, s, session[s].tunnel, "   Radius reply contains Filter-Id \"%.*s\"\n", l, filter);
+						if ((suffix = memchr(filter, '.', l)))
+						{
+							int b = suffix - filter;
+							if (l - b == 3 && !memcmp("in", suffix+1, 2))
+								f = &session[s].filter_in;
+							else if (l - b == 4 && !memcmp("out", suffix+1, 3))
+								f = &session[s].filter_out;
+
+							l = b;
+						}
+
+						if (!f)
+						{
+							LOG(3, s, session[s].tunnel, "    Invalid filter\n");
+							continue;
+						}
+
+						for (*f = 0, i = 0; !*f && i < MAXFILTER; i++)
+							if (strlen(ip_filters[i].name) == l &&
+							    !strncmp(ip_filters[i].name, filter, l))
+								*f = i + 1;
+
+						if (*f)
+							ip_filters[*f - 1].used++;
+						else
+							LOG(3, s, session[s].tunnel, "    Unknown filter\n");
+
+					}
+					else if (*p == 26 && p[1] >= 7)
 					{
 						// Vendor-Specific Attribute
 						int vendor = ntohl(*(int *)(p + 2));
 						char attrib = *(p + 6);
 						char attrib_length = *(p + 7) - 2;
-						log(3, 0, s, session[s].tunnel, "   Radius reply contains Vendor-Specific. Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length);
-						if (attrib_length == 0) continue;
-						if (attrib != 1)
-							log(3, 0, s, session[s].tunnel, "      Unknown vendor-specific\n");
-						else
+						char *avpair, *value, *key, *newp;
+
+						LOG(3, s, session[s].tunnel, "   Radius reply contains Vendor-Specific.  Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length);
+						if (vendor != 9 || attrib != 1)
 						{
-							char *avpair, *value, *key, *newp;
-							avpair = key = calloc(attrib_length + 1, 1);
-							memcpy(avpair, p + 8, attrib_length);
-							log(3, 0, s, session[s].tunnel, "      Cisco-Avpair value: %s\n", avpair);
-							do {
-								value = strchr(key, '=');
-								if (!value) break;
-								*value++ = 0;
-
-								// Trim quotes off reply string
-								if (*value == '\'' || *value == '\"')
-								{
-									char *x;
-									value++;
-									x = value + strlen(value) - 1;
-									if (*x == '\'' || *x == '\"')
-										*x = 0;
-								}
-
-								// Run hooks
-								newp = strchr(value, ',');
-								if (newp) *newp++ = 0;
-								{
-									struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], key, value };
-									run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
-								}
-								key = newp;
-							} while (newp);
-							free(avpair);
+							LOG(3, s, session[s].tunnel, "      Unknown vendor-specific\n");
+							continue;
 						}
+
+						if (attrib_length < 0) continue;
+
+						avpair = key = calloc(attrib_length + 1, 1);
+						memcpy(avpair, p + 8, attrib_length);
+						LOG(3, s, session[s].tunnel, "      Cisco-Avpair value: %s\n", avpair);
+						do {
+							value = strchr(key, '=');
+							if (!value) break;
+							*value++ = 0;
+
+							// Trim quotes off reply string
+							if (*value == '\'' || *value == '\"')
+							{
+								char *x;
+								value++;
+								x = value + strlen(value) - 1;
+								if (*x == '\'' || *x == '\"')
+									*x = 0;
+							}
+
+							// Run hooks
+							newp = strchr(value, ',');
+							if (newp) *newp++ = 0;
+							{
+								struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], key, value };
+								run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
+							}
+							key = newp;
+						} while (newp);
+						free(avpair);
 					}
 				}
 			}
 			else if (*buf == 3)
 			{
-				log(2, 0, s, session[s].tunnel, "   Authentication denied for %s\n", session[s].user);
+				LOG(2, s, session[s].tunnel, "   Authentication rejected for %s\n", session[s].user);
+				sessionkill(s, "Authentication rejected");
 				break;
 			}
 
-			// Check for Assign-IP-Address
-			if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
-			{
-				session[s].ip = assign_ip_address();
-				if (session[s].ip)
-					log(3, 0, s, t, "   No IP allocated by radius. Assigned %s from pool\n",
-							inet_toa(htonl(session[s].ip)));
-				else
-					log(3, 0, s, t, "   No IP allocated by radius. None available in pool\n");
-			}
-			if (!session[s].dns1 && default_dns1)
+			if (!session[s].dns1 && config->default_dns1)
 			{
-				session[s].dns1 = htonl(default_dns1);
-				log(3, 0, s, t, "   Sending dns1 = %s\n", inet_toa(default_dns1));
+				session[s].dns1 = htonl(config->default_dns1);
+				LOG(3, s, t, "   Sending dns1 = %s\n", fmtaddr(config->default_dns1, 0));
 			}
-			if (!session[s].dns2 && default_dns2)
+			if (!session[s].dns2 && config->default_dns2)
 			{
-				session[s].dns2 = htonl(default_dns2);
-				log(3, 0, s, t, "   Sending dns2 = %s\n", inet_toa(default_dns2));
+				session[s].dns2 = htonl(config->default_dns2);
+				LOG(3, s, t, "   Sending dns2 = %s\n", fmtaddr(config->default_dns2, 0));
 			}
 
-			if (session[s].ip)
-			{
-				// Valid Session, set it up
-				session[s].sid = 0;
-				sessionsetup(t, s, routes);
-			}
-			else
-			{
-				log(0, 0, s, t, "   End of processrad(), but no valid session exists.\n");
-				sessionkill(s, "Can't create valid session");
-			}
+			// Valid Session, set it up
+			session[s].unique_id = 0;
+			sessionsetup(t, s);
 		}
 		else
 		{
-			log(3, 0, s, t, "   RADIUS response in state %d\n", radius[r].state);
+				// An ack for a stop or start record.
+			LOG(3, s, t, "   RADIUS accounting ack recv in state %s\n", radius_states[radius[r].state]);
+			break;
 		}
 	} while (0);
 
@@ -575,40 +681,40 @@ void processrad(u8 * buf, int len)
 }
 
 // Send a retry for RADIUS/CHAP message
-void radiusretry(u8 r)
+void radiusretry(uint16_t r)
 {
 	sessionidt s = radius[r].session;
 	tunnelidt t = 0;
-#ifdef STAT_CALLS
-	STAT(call_radiusretry);
-#endif
+
+	CSTAT(call_radiusretry);
+
 	if (s)
 		t = session[s].tunnel;
-	radius[r].retry = 0;
+
+	radius[r].retry = backoff(radius[r].try + 1);
 	switch (radius[r].state)
 	{
-	case RADIUSCHAP:           // sending CHAP down PPP
-		sendchap(t, s);
-		break;
-	case RADIUSIPCP:
-		sendipcp(t, s);         // send IPCP
-		break;
-	case RADIUSAUTH:           // sending auth to RADIUS server
-		radiussend(r, RADIUSAUTH);
-		break;
-	case RADIUSSTART:          // sending start accounting to RADIUS server
-		radiussend(r, RADIUSSTART);
-		break;
-	case RADIUSSTOP:           // sending stop accounting to RADIUS server
-		radiussend(r, RADIUSSTOP);
-		break;
-	default:
-	case RADIUSNULL:           // Not in use
-	case RADIUSWAIT:           // waiting timeout before available, in case delayed reply from RADIUS server
-		// free up RADIUS task
-		radiusclear(r, s);
-		log(3, 0, s, session[s].tunnel, "Freeing up radius session %d\n", r);
-		break;
+		case RADIUSCHAP:           // sending CHAP down PPP
+			sendchap(t, s);
+			break;
+		case RADIUSIPCP:
+			sendipcp(t, s);         // send IPCP
+			break;
+		case RADIUSAUTH:           // sending auth to RADIUS server
+			radiussend(r, RADIUSAUTH);
+			break;
+		case RADIUSSTART:          // sending start accounting to RADIUS server
+			radiussend(r, RADIUSSTART);
+			break;
+		case RADIUSSTOP:           // sending stop accounting to RADIUS server
+			radiussend(r, RADIUSSTOP);
+			break;
+		default:
+		case RADIUSNULL:           // Not in use
+		case RADIUSWAIT:           // waiting timeout before available, in case delayed reply from RADIUS server
+			// free up RADIUS task
+			radiusclear(r, s);
+			LOG(3, s, session[s].tunnel, "Freeing up radius session %d\n", r);
+			break;
 	}
 }
-