X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/401271b5bbd3478716bd210079cc6294fc92fa5a..d266f5fc934a5c587a046af4116a342e11ca361e:/l2tpns.c

diff --git a/l2tpns.c b/l2tpns.c
index 6081a7f..3b4b6af 100644
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -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 1.109 2005-06-12 06:10:29 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.142 2005-09-19 02:39:57 bodea Exp $";
 
 #include <arpa/inet.h>
 #include <assert.h>
@@ -60,6 +60,7 @@ int tunfd = -1;			// tun interface file handle. (network device)
 int udpfd = -1;			// UDP file handle
 int controlfd = -1;		// Control signal handle
 int clifd = -1;			// Socket listening for CLI connections.
+int daefd = -1;			// Socket listening for DAE connections.
 int snoopfd = -1;		// UDP file handle for sending out intercept data
 int *radfds = NULL;		// RADIUS requests file handles
 int ifrfd = -1;			// File descriptor for routing, etc
@@ -74,6 +75,10 @@ static int syslog_log = 0;	// are we logging to syslog
 static FILE *log_stream = 0;	// file handle for direct logging (i.e. direct into file, not via syslog).
 uint32_t last_id = 0;		// Unique ID for radius accounting
 
+// calculated from config->l2tp_mtu
+uint16_t MRU = 0;		// PPP MRU
+uint16_t MSS = 0;		// TCP MSS
+
 struct cli_session_actions *cli_session_actions = NULL;	// Pending session changes requested by CLI
 struct cli_tunnel_actions *cli_tunnel_actions = NULL;	// Pending tunnel changes required by CLI
 
@@ -91,7 +96,9 @@ uint32_t eth_tx = 0;
 static uint32_t ip_pool_size = 1;	// Size of the pool of addresses used for dynamic address allocation.
 time_t time_now = 0;			// Current time in seconds since epoch.
 static char time_now_string[64] = {0};	// Current time as a string.
+int time_changed = 0;			// time_now changed
 char main_quit = 0;			// True if we're in the process of exiting.
+char main_reload = 0;			// Re-load pending
 linked_list *loaded_plugins;
 linked_list *plugins[MAX_PLUGIN_TYPES];
 
@@ -103,7 +110,11 @@ config_descriptt config_values[] = {
 	CONFIG("log_file", log_filename, STRING),
 	CONFIG("pid_file", pid_file, STRING),
 	CONFIG("random_device", random_device, STRING),
-	CONFIG("l2tp_secret", l2tpsecret, STRING),
+	CONFIG("l2tp_secret", l2tp_secret, STRING),
+	CONFIG("l2tp_mtu", l2tp_mtu, INT),
+	CONFIG("ppp_restart_time", ppp_restart_time, INT),
+	CONFIG("ppp_max_configure", ppp_max_configure, INT),
+	CONFIG("ppp_max_failure", ppp_max_failure, INT),
 	CONFIG("primary_dns", default_dns1, IPv4),
 	CONFIG("secondary_dns", default_dns2, IPv4),
 	CONFIG("primary_radius", radiusserver[0], IPv4),
@@ -114,6 +125,7 @@ config_descriptt config_values[] = {
 	CONFIG("radius_interim", radius_interim, INT),
 	CONFIG("radius_secret", radiussecret, STRING),
 	CONFIG("radius_authtypes", radius_authtypes_s, STRING),
+	CONFIG("radius_dae_port", radius_dae_port, SHORT),
 	CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
 	CONFIG("bind_address", bind_address, IPv4),
 	CONFIG("peer_address", peer_address, IPv4),
@@ -130,6 +142,7 @@ config_descriptt config_values[] = {
 	CONFIG("packet_limit", max_packets, INT),
 	CONFIG("cluster_address", cluster_address, IPv4),
 	CONFIG("cluster_interface", cluster_interface, STRING),
+	CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
 	CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
 	CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
  	CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
@@ -148,6 +161,7 @@ static char *plugin_functions[] = {
 	"plugin_kill_session",
 	"plugin_control",
 	"plugin_radius_response",
+	"plugin_radius_reset",
 	"plugin_become_master",
 	"plugin_new_session_master",
 };
@@ -163,7 +177,7 @@ sessiont *session = NULL;		// Array of session structures.
 sessionlocalt *sess_local = NULL;	// Array of local per-session counters.
 radiust *radius = NULL;			// Array of radius structures.
 ippoolt *ip_address_pool = NULL;	// Array of dynamic IP addresses.
-ip_filtert *ip_filters = NULL;	// Array of named filters.
+ip_filtert *ip_filters = NULL;		// Array of named filters.
 static controlt *controlfree = 0;
 struct Tstats *_statistics = NULL;
 #ifdef RINGBUFFER
@@ -176,10 +190,9 @@ static void cache_ipv6map(struct in6_addr ip, int prefixlen, int s);
 static void free_ip_address(sessionidt s);
 static void dump_acct_info(int all);
 static void sighup_handler(int sig);
-static void sigalrm_handler(int sig);
 static void shutdown_handler(int sig);
 static void sigchild_handler(int sig);
-static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response);
+static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
 static void update_config(void);
 static void read_config_file(void);
 static void initplugins(void);
@@ -198,11 +211,17 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec
 #define QUIT_SHUTDOWN	2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
 
 // return internal time (10ths since process startup), set f if given
+// as a side-effect sets time_now, and time_changed
 static clockt now(double *f)
 {
 	struct timeval t;
 	gettimeofday(&t, 0);
 	if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
+	if (t.tv_sec != time_now)
+	{
+	    time_now = t.tv_sec;
+	    time_changed++;
+	}
 	return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
 }
 
@@ -255,10 +274,10 @@ void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
 	va_end(ap);
 }
 
-void _log_hex(int level, const char *title, const char *data, int maxsize)
+void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
 {
 	int i, j;
-	const uint8_t *d = (const uint8_t *) data;
+	const uint8_t *d = data;
 
 	if (config->debug < level) return;
 
@@ -326,7 +345,8 @@ static void initrandom(char *source)
 		return;
 
 	// close previous source, if any
-	if (rand_fd >= 0) close(rand_fd);
+	if (rand_fd >= 0)
+		close(rand_fd);
 
 	rand_fd = -1;
 
@@ -343,13 +363,6 @@ static void initrandom(char *source)
 					path, strerror(errno));
 		}
 	}
-
-	// no source: seed prng
-	{
-		unsigned seed = time_now ^ getpid();
-		LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
-		srand(seed);
-	}
 }
 
 // fill buffer with random data
@@ -370,7 +383,7 @@ void random_data(uint8_t *buf, int len)
 					strerror(errno));
 
 				// fall back to rand()
-				initrandom(0);
+				initrandom(NULL);
 			}
 
 			n = 0;
@@ -554,7 +567,7 @@ static void inittun(void)
 	tunidx = ifr.ifr_ifindex;
 
 	// Only setup IPv6 on the tun device if we have a configured prefix
-	if (config->ipv6_prefix.s6_addr[0] > 0) {
+	if (config->ipv6_prefix.s6_addr[0]) {
 		ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0);
 
 		// Link local address is FE80::1
@@ -584,7 +597,7 @@ static void inittun(void)
 	}
 }
 
-// set up UDP port
+// set up UDP ports
 static void initudp(void)
 {
 	int on = 1;
@@ -606,7 +619,6 @@ static void initudp(void)
 		LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
 		exit(1);
 	}
-	snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 
 	// Control
 	memset(&addr, 0, sizeof(addr));
@@ -619,6 +631,21 @@ static void initudp(void)
 		LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
 		exit(1);
 	}
+
+	// Dynamic Authorization Extensions to RADIUS
+	memset(&addr, 0, sizeof(addr));
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(config->radius_dae_port);
+	daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+	setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+	if (bind(daefd, (void *) &addr, sizeof(addr)) < 0)
+	{
+		LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	// Intercept
+	snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 }
 
 //
@@ -691,8 +718,11 @@ sessionidt sessionbyipv6(struct in6_addr ip)
 	CSTAT(sessionbyipv6);
 
 	if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
-		(ip.s6_addr[0] == 0xFE && ip.s6_addr[1] == 0x80 &&
-		 (ip.s6_addr16[1] == ip.s6_addr16[2] == ip.s6_addr16[3] == 0))) {
+		(ip.s6_addr[0] == 0xFE &&
+		 ip.s6_addr[1] == 0x80 &&
+		 ip.s6_addr16[1] == 0 &&
+		 ip.s6_addr16[2] == 0 &&
+		 ip.s6_addr16[3] == 0)) {
 		s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
 	} else {
 		s = lookup_ipv6map(ip);
@@ -960,16 +990,71 @@ int tun_write(uint8_t * data, int size)
 	return write(tunfd, data, size);
 }
 
+// adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
+void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
+{
+	int d = (tcp[12] >> 4) * 4;
+	uint8_t *mss = 0;
+	uint8_t *opts;
+	uint8_t *data;
+	uint16_t orig;
+	uint32_t sum;
+
+	if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
+		return;
+
+	if (tcp + d > buf + len) // short?
+		return;
+
+	opts = tcp + 20;
+	data = tcp + d;
+
+	while (opts < data)
+	{
+		if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
+		{
+			mss = opts + 2;
+			if (mss + 2 > data) return; // short?
+			break;
+		}
+
+		if (*opts == 0) return; // end of options
+		if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
+			opts++;
+		else
+			opts += opts[1]; // skip over option
+	}
+
+	if (!mss) return; // not found
+	orig = ntohs(*(uint16_t *) mss);
+
+	if (orig <= MSS) return; // mss OK
+
+	LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
+		fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
+		fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
+		(tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
+
+	// set mss
+	*(int16_t *) mss = htons(MSS);
+
+	// adjust checksum (see rfc1141)
+	sum = orig + (~MSS & 0xffff);
+	sum += ntohs(*(uint16_t *) (tcp + 16));
+	sum = (sum & 0xffff) + (sum >> 16);
+	*(uint16_t *) (tcp + 16) = htons(sum);
+}
+
 // process outgoing (to tunnel) IP
 //
-static void processipout(uint8_t * buf, int len)
+static void processipout(uint8_t *buf, int len)
 {
 	sessionidt s;
 	sessiont *sp;
 	tunnelidt t;
 	in_addr_t ip;
 
-	char *data = buf;	// Keep a copy of the originals.
+	uint8_t *data = buf;	// Keep a copy of the originals.
 	int size = len;
 
 	uint8_t b[MAXETHER + 20];
@@ -1067,6 +1152,14 @@ static void processipout(uint8_t * buf, int len)
 	if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
 		return;
 
+	// adjust MSS on SYN and SYN,ACK packets with options
+	if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
+	{
+		int ihl = (buf[0] & 0xf) * 4; // length of IP header
+		if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
+			adjust_tcp_mss(s, t, buf, len, buf + ihl);
+	}
+
 	if (sp->tbf_out)
 	{
 		// Are we throttling this session?
@@ -1087,7 +1180,7 @@ static void processipout(uint8_t * buf, int len)
 
 	// Add on L2TP header
 	{
-		uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
+		uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
 		if (!p) return;
 		tunnelsend(b, len + (p-b), t); // send it...
 	}
@@ -1115,7 +1208,7 @@ static void processipv6out(uint8_t * buf, int len)
 	in_addr_t ip;
 	struct in6_addr ip6;
 
-	char *data = buf;	// Keep a copy of the originals.
+	uint8_t *data = buf;	// Keep a copy of the originals.
 	int size = len;
 
 	uint8_t b[MAXETHER + 20];
@@ -1198,7 +1291,7 @@ static void processipv6out(uint8_t * buf, int len)
 
 	// Add on L2TP header
 	{
-		uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIPV6);
+		uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6);
 		if (!p) return;
 		tunnelsend(b, len + (p-b), t); // send it...
 	}
@@ -1250,7 +1343,7 @@ static void send_ipout(sessionidt s, uint8_t *buf, int len)
 
 	// Add on L2TP header
 	{
-		uint8_t *p = makeppp(b, sizeof(b),  buf, len, t, s, PPPIP);
+		uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
 		if (!p) return;
 		tunnelsend(b, len + (p-b), t); // send it...
 	}
@@ -1302,7 +1395,7 @@ static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
 }
 
 // add a binary AVP
-static void controlb(controlt * c, uint16_t avp, char *val, unsigned int len, uint8_t m)
+static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
 {
 	uint16_t l = ((m ? 0x8000 : 0) + len + 6);
 	*(uint16_t *) (c->buf + c->length + 0) = htons(l);
@@ -1349,7 +1442,7 @@ static void controlnull(tunnelidt t)
 }
 
 // add a control message to a tunnel, and send if within window
-static void controladd(controlt * c, tunnelidt t, sessionidt far)
+static void controladd(controlt *c, sessionidt far, tunnelidt t)
 {
 	*(uint16_t *) (c->buf + 2) = htons(c->length); // length
 	*(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
@@ -1421,7 +1514,7 @@ void throttle_session(sessionidt s, int rate_in, int rate_out)
 }
 
 // add/remove filters from session (-1 = no change)
-static void filter_session(sessionidt s, int filter_in, int filter_out)
+void filter_session(sessionidt s, int filter_in, int filter_out)
 {
 	if (!session[s].opened)
 		return; // No-one home.
@@ -1482,10 +1575,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error)
 	if (session[s].ip && !walled_garden && !session[s].die)
 	{
 		// RADIUS Stop message
-		uint16_t r = sess_local[s].radius;
-		if (!r)
-			r = radiusnew(s);
-
+		uint16_t r = radiusnew(s);
 		if (r)
 		{
 			// stop, if not already trying
@@ -1523,7 +1613,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error)
 			free_ip_address(s);
 
 		// unroute IPv6, if setup
-		if (session[s].flags & SF_IPV6_ROUTED)
+		if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen)
 			route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
 	}
 
@@ -1535,7 +1625,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error)
 		controlt *c = controlnew(14); // sending CDN
 		if (error)
 		{
-			char buf[4];
+			uint8_t buf[4];
 			*(uint16_t *) buf     = htons(result);
 			*(uint16_t *) (buf+2) = htons(error);
 			controlb(c, 1, buf, 4, 1);
@@ -1544,7 +1634,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error)
 			control16(c, 1, result, 1);
 
 		control16(c, 14, s, 1);   // assigned session (our end)
-		controladd(c, session[s].tunnel, session[s].far); // send the message
+		controladd(c, session[s].far, session[s].tunnel); // send the message
 	}
 
 	if (!session[s].die)
@@ -1554,78 +1644,68 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error)
 	if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
 	if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
 
+	// clear PPP state
+	memset(&session[s].ppp, 0, sizeof(session[s].ppp));
+	sess_local[s].lcp.restart = 0;
+	sess_local[s].ipcp.restart = 0;
+	sess_local[s].ipv6cp.restart = 0;
+	sess_local[s].ccp.restart = 0;
+
 	cluster_send_session(s);
 }
 
-void sendipcp(tunnelidt t, sessionidt s)
+void sendipcp(sessionidt s, tunnelidt t)
 {
-	uint8_t buf[MAXCONTROL];
-	uint16_t r = sess_local[s].radius;
+	uint8_t buf[MAXETHER];
 	uint8_t *q;
 
 	CSTAT(sendipcp);
+	LOG(3, s, t, "IPCP: send ConfigReq\n");
 
-	if (!r)
-		r = radiusnew(s);
-
-	if (!r)
-	{
-		sessionshutdown(s, "No free RADIUS sessions for IPCP", 3, 0);
-		return;
-	}
-
-	if (radius[r].state != RADIUSIPCP)
-	{
-		radius[r].state = RADIUSIPCP;
-		radius[r].try = 0;
-	}
-
-	radius[r].retry = backoff(radius[r].try++);
-	if (radius[r].try > 10)
+	if (!session[s].unique_id)
 	{
-		radiusclear(r, s);	// Clear radius session.
-		sessionshutdown(s, "No reply to IPCP.", 3, 0);
-		return;
+		if (!++last_id) ++last_id; // skip zero
+		session[s].unique_id = last_id;
 	}
 
-	q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
+	q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP);
 	if (!q) return;
 
 	*q = ConfigReq;
-	q[1] = r >> RADIUS_SHIFT;                    // ID, dont care, we only send one type of request
-	*(uint16_t *) (q + 2) = htons(10);
-	q[4] = 3;
-	q[5] = 6;
+	q[1] = session[s].unique_id & 0xf;	// ID, dont care, we only send one type of request
+	*(uint16_t *) (q + 2) = htons(10);	// packet length
+	q[4] = 3;				// ip address option
+	q[5] = 6;				// option length
 	*(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
 				 config->bind_address ? config->bind_address :
 				 my_address; // send my IP
 
 	tunnelsend(buf, 10 + (q - buf), t); // send it
-	session[s].flags &= ~SF_IPCP_ACKED;	// Clear flag.
-
-	// If we have an IPv6 prefix length configured, assume we should
-	// try to negotiate an IPv6 session as well. Unless we've had a
-	// (N)ACK for IPV6CP.
-	if (config->ipv6_prefix.s6_addr[0] > 0 && 
-			!(session[s].flags & SF_IPV6CP_ACKED) &&
-			!(session[s].flags & SF_IPV6_NACKED))
-	{
-		q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPV6CP);
-		if (!q) return;
-
-		*q = ConfigReq;
-		q[1] = r >> RADIUS_SHIFT;		// ID, don't care, we
-							// only send one type
-							// of request
-		*(uint16_t *) (q + 2) = htons(14);
-		q[4] = 1;
-		q[5] = 10;
-		*(uint32_t *) (q + 6) = 0;		// We'll be prefix::1
-		*(uint32_t *) (q + 10) = 0;
-		q[13] = 1;
-
-		tunnelsend(buf, 14 + (q - buf), t);	// send it
-	}
+}
+
+void sendipv6cp(sessionidt s, tunnelidt t)
+{
+	uint8_t buf[MAXETHER];
+	uint8_t *q;
+
+	CSTAT(sendipv6cp);
+	LOG(3, s, t, "IPV6CP: send ConfigReq\n");
+
+	q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP);
+	if (!q) return;
+
+	*q = ConfigReq;
+	q[1] = session[s].unique_id & 0xf;	// ID, don't care, we
+						// only send one type
+						// of request
+	*(uint16_t *) (q + 2) = htons(14);
+	q[4] = 1;				// interface identifier option
+	q[5] = 10;				// option length
+	*(uint32_t *) (q + 6) = 0;		// We'll be prefix::1
+	*(uint32_t *) (q + 10) = 0;
+	q[13] = 1;
+
+	tunnelsend(buf, 14 + (q - buf), t);	// send it
 }
 
 static void sessionclear(sessionidt s)
@@ -1731,7 +1811,7 @@ static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, cha
 		controlt *c = controlnew(4);	// sending StopCCN
 		if (error)
 		{
-			char buf[64];
+			uint8_t buf[64];
 			int l = 4;
 			*(uint16_t *) buf     = htons(result);
 			*(uint16_t *) (buf+2) = htons(error);
@@ -1751,14 +1831,14 @@ static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, cha
 			control16(c, 1, result, 1);
 
 		control16(c, 9, t, 1);		// assigned tunnel (our end)
-		controladd(c, t, 0);		// send the message
+		controladd(c, 0, t);		// send the message
 	}
 }
 
 // read and process packet on tunnel (UDP)
-void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
+void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
 {
-	char *chapresponse = NULL;
+	uint8_t *chapresponse = NULL;
 	uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
 	uint8_t *p = buf + 2;
 
@@ -1822,12 +1902,16 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 		return;
 	}
 	l -= (p - buf);
+
+	// used to time out old tunnels
+	if (t && tunnel[t].state == TUNNELOPEN)
+		tunnel[t].lastrec = time_now;
+
 	if (*buf & 0x80)
 	{                          // control
 		uint16_t message = 0xFFFF;	// message type
 		uint8_t fatal = 0;
 		uint8_t mandatory = 0;
-		uint8_t authtype = 0;		// proxy auth type
 		uint16_t asession = 0;		// assigned session
 		uint32_t amagic = 0;		// magic number
 		uint8_t aflags = 0;		// flags from last LCF
@@ -1910,9 +1994,6 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 			return;
 		}
 
-		// This is used to time out old tunnels
-		tunnel[t].lastrec = time_now;
-
 		// check sequence of this message
 		{
 			int skip = tunnel[t].window; // track how many in-window packets are still in queue
@@ -2002,7 +2083,7 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 					uint16_t orig_len;
 
 					// handle hidden AVPs
-					if (!*config->l2tpsecret)
+					if (!*config->l2tp_secret)
 					{
 						LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
 						fatal = flags;
@@ -2030,8 +2111,6 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 						continue;
 					}
 
-					LOG(4, s, t, "Hidden AVP\n");
-
 					// Unhide the AVP
 					unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
 
@@ -2052,13 +2131,15 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 					n = orig_len;
 				}
 
-				LOG(4, s, t, "   AVP %d (%s) len %d\n", mtype, avp_name(mtype), n);
+				LOG(4, s, t, "   AVP %d (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
+					flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
+
 				switch (mtype)
 				{
 				case 0:     // message type
 					message = ntohs(*(uint16_t *) b);
 					mandatory = flags & 0x80;
-					LOG(4, s, t, "   Message type = %d (%s)\n", *b, l2tp_message_type(message));
+					LOG(4, s, t, "   Message type = %d (%s)\n", *b, l2tp_code(message));
 					break;
 				case 1:     // result code
 					{
@@ -2066,18 +2147,18 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 						const char* resdesc = "(unknown)";
 						if (message == 4)
 						{ /* StopCCN */
-							resdesc = stopccn_result_code(rescode);
+							resdesc = l2tp_stopccn_result_code(rescode);
 						}
 						else if (message == 14)
 						{ /* CDN */
-							resdesc = cdn_result_code(rescode);
+							resdesc = l2tp_cdn_result_code(rescode);
 						}
 
 						LOG(4, s, t, "   Result Code %d: %s\n", rescode, resdesc);
 						if (n >= 4)
 						{
 							uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
-							LOG(4, s, t, "   Error Code %d: %s\n", errcode, error_code(errcode));
+							LOG(4, s, t, "   Error Code %d: %s\n", errcode, l2tp_error_code(errcode));
 						}
 						if (n > 4)
 							LOG(4, s, t, "   Error String: %.*s\n", n-4, b+4);
@@ -2211,12 +2292,7 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 				case 29:    // Proxy Authentication Type
 					{
 						uint16_t atype = ntohs(*(uint16_t *)b);
-						LOG(4, s, t, "   Proxy Auth Type %d (%s)\n", atype, auth_type(atype));
-						if (atype == 2)
-							authtype = AUTHCHAP;
-						else if (atype == 3)
-							authtype = AUTHPAP;
-
+						LOG(4, s, t, "   Proxy Auth Type %d (%s)\n", atype, ppp_auth_type(atype));
 						break;
 					}
 				case 30:    // Proxy Authentication Name
@@ -2231,16 +2307,12 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 				case 31:    // Proxy Authentication Challenge
 					{
 						LOG(4, s, t, "   Proxy Auth Challenge\n");
-						if (sess_local[s].radius)
-							memcpy(radius[sess_local[s].radius].auth, b, 16);
 						break;
 					}
 				case 32:    // Proxy Authentication ID
 					{
 						uint16_t authid = ntohs(*(uint16_t *)(b));
 						LOG(4, s, t, "   Proxy Auth ID (%d)\n", authid);
-						if (sess_local[s].radius)
-							radius[sess_local[s].radius].id = authid;
 						break;
 					}
 				case 33:    // Proxy Authentication Response
@@ -2253,10 +2325,6 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 						{
 							if (*p == 5 && p[1] == 6) // Magic-Number
 								amagic = ntohl(*(uint32_t *) (p + 2));
-							else if (*p == 3 && p[1] == 4 && *(uint16_t *) (p + 2) == htons(PPPPAP)) // Authentication-Protocol (PAP)
-								authtype = AUTHPAP;
-							else if (*p == 3 && p[1] == 5 && *(uint16_t *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol (CHAP)
-								authtype = AUTHCHAP;
 							else if (*p == 7) // Protocol-Field-Compression
 								aflags |= SESSIONPFC;
 							else if (*p == 8) // Address-and-Control-Field-Compression
@@ -2274,6 +2342,8 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 				case 36:    // Random Vector
 					LOG(4, s, t, "   Random Vector received.  Enabled AVP Hiding.\n");
 					memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
+					if (n > sizeof(session[s].random_vector))
+						n = sizeof(session[s].random_vector);
 					memcpy(session[s].random_vector, b, n);
 					session[s].random_vector_length = n;
 					break;
@@ -2302,10 +2372,10 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 						controlt *c = controlnew(2); // sending SCCRP
 						control16(c, 2, version, 1); // protocol version
 						control32(c, 3, 3, 1); // framing
-						controls(c, 7, tunnel[t].hostname, 1); // host name (TBA)
+						controls(c, 7, hostname, 1); // host name
 						if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
 						control16(c, 9, t, 1); // assigned tunnel
-						controladd(c, t, 0); // send the resply
+						controladd(c, 0, t); // send the resply
 					}
 					else
 					{
@@ -2338,7 +2408,7 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 				case 10:      // ICRQ
 					if (sessionfree && main_quit != QUIT_SHUTDOWN)
 					{
-						uint16_t r;
+						controlt *c = controlnew(11); // ICRP
 
 						s = sessionfree;
 						sessionfree = session[s].next;
@@ -2347,43 +2417,36 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 						if (s > config->cluster_highest_sessionid)
 							config->cluster_highest_sessionid = s;
 
-						// make a RADIUS session
-						if ((r = radiusnew(s)))
-						{
-							controlt *c = controlnew(11); // sending ICRP
-							session[s].opened = time_now;
-							session[s].tunnel = t;
-							session[s].far = asession;
-							session[s].last_packet = time_now;
-							LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far);
-							control16(c, 14, s, 1); // assigned session
-							controladd(c, t, asession); // send the reply
-
-							strncpy(radius[r].calling, calling, sizeof(radius[r].calling) - 1);
-							strncpy(session[s].called, called, sizeof(session[s].called) - 1);
-							strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
-							STAT(session_created);
-							break;
-						}
+						session[s].opened = time_now;
+						session[s].tunnel = t;
+						session[s].far = asession;
+						session[s].last_packet = time_now;
+						LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far);
+						control16(c, 14, s, 1); // assigned session
+						controladd(c, asession, t); // send the reply
 
+						strncpy(session[s].called, called, sizeof(session[s].called) - 1);
+						strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
 
-						LOG(1, s, t, "No free RADIUS sessions for ICRQ\n");
-						sessionclear(s);
-					}
-					else
-					{
-						STAT(session_overflow);
-						LOG(1, 0, t, "No free sessions\n");
+						session[s].ppp.phase = Establish;
+						session[s].ppp.lcp = Starting;
+
+						STAT(session_created);
+						break;
 					}
 
 					{
 						controlt *c = controlnew(14); // CDN
-						if (main_quit == QUIT_SHUTDOWN)
-							control16(c, 1, 2, 7); // try another
-						else
+						if (!sessionfree)
+						{
+							STAT(session_overflow);
+							LOG(1, 0, t, "No free sessions\n");
 							control16(c, 1, 4, 0); // temporary lack of resources
+						}
+						else
+							control16(c, 1, 2, 7); // shutting down, try another
 
-						controladd(c, t, asession); // send the message
+						controladd(c, asession, t); // send the message
 					}
 					return;
 				case 11:      // ICRP
@@ -2393,14 +2456,18 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 					if (amagic == 0) amagic = time_now;
 					session[s].magic = amagic; // set magic number
 					session[s].l2tp_flags = aflags; // set flags received
-					LOG(3, s, t, "Magic %X Flags %X\n", amagic, aflags);
+					session[s].mru = PPPMTU; // default
 					controlnull(t); // ack
-					// proxy authentication type is not supported
-					if (!(config->radius_authtypes & authtype))
-						authtype = config->radius_authprefer;
 
 					// start LCP
-					sendlcp(t, s, authtype);
+					sess_local[s].lcp.restart = time_now + config->ppp_restart_time;
+					sess_local[s].lcp.conf_sent = 1;
+					sess_local[s].lcp.nak_sent = 0;
+					sess_local[s].lcp_authtype = config->radius_authprefer;
+					sess_local[s].ppp_mru = MRU;
+					session[s].ppp.lcp = RequestSent;
+					sendlcp(s, t);
+
 					break;
 				case 14:      // CDN
 					controlnull(t); // ack
@@ -2427,7 +2494,7 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 	}
 	else
 	{                          // data
-		uint16_t prot;
+		uint16_t proto;
 
 		LOG_HEX(5, "Receive Tunnel Data", p, l);
 		if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
@@ -2443,12 +2510,12 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 		}
 		if (*p & 1)
 		{
-			prot = *p++;
+			proto = *p++;
 			l--;
 		}
 		else
 		{
-			prot = ntohs(*(uint16_t *) p);
+			proto = ntohs(*(uint16_t *) p);
 			p += 2;
 			l -= 2;
 		}
@@ -2468,50 +2535,43 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 			return;
 		}
 
-		if (prot == PPPPAP)
+		if (proto == PPPPAP)
 		{
 			session[s].last_packet = time_now;
 			if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
-			processpap(t, s, p, l);
+			processpap(s, t, p, l);
 		}
-		else if (prot == PPPCHAP)
+		else if (proto == PPPCHAP)
 		{
 			session[s].last_packet = time_now;
 			if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
-			processchap(t, s, p, l);
+			processchap(s, t, p, l);
 		}
-		else if (prot == PPPLCP)
+		else if (proto == PPPLCP)
 		{
 			session[s].last_packet = time_now;
 			if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
-			processlcp(t, s, p, l);
+			processlcp(s, t, p, l);
 		}
-		else if (prot == PPPIPCP)
+		else if (proto == PPPIPCP)
 		{
 			session[s].last_packet = time_now;
 			if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
-			processipcp(t, s, p, l);
+			processipcp(s, t, p, l);
 		}
-		else if (prot == PPPIPV6CP)
+		else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
 		{
-			if (config->ipv6_prefix.s6_addr[0] > 0)
-			{
-				session[s].last_packet = time_now;
-				if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
-				processipv6cp(t, s, p, l);
-			}
-			else
-			{
-				LOG(1, s, t, "IPv6 not configured; ignoring IPv6CP\n");
-			}
+			session[s].last_packet = time_now;
+			if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
+			processipv6cp(s, t, p, l);
 		}
-		else if (prot == PPPCCP)
+		else if (proto == PPPCCP)
 		{
 			session[s].last_packet = time_now;
 			if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
-			processccp(t, s, p, l);
+			processccp(s, t, p, l);
 		}
-		else if (prot == PPPIP)
+		else if (proto == PPPIP)
 		{
 			if (session[s].die)
 			{
@@ -2526,15 +2586,10 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 				return;
 			}
 
-			processipin(t, s, p, l);
+			processipin(s, t, p, l);
 		}
-		else if (prot == PPPIPV6)
+		else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
 		{
-			if (!config->ipv6_prefix.s6_addr[0] > 0)
-			{
-				LOG(1, s, t, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
-				return;
-			}
 			if (session[s].die)
 			{
 				LOG(4, s, t, "Session %d is closing.  Don't process PPP packets\n", s);
@@ -2548,12 +2603,38 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr)
 				return;
 			}
 
-			processipv6in(t, s, p, l);
+			processipv6in(s, t, p, l);
+		}
+		else if (session[s].ppp.lcp == Opened)
+		{
+			uint8_t buf[MAXETHER];
+			uint8_t *q;
+			int mru = session[s].mru;
+			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);
 		}
 		else
 		{
-			STAT(tunnel_rx_errors);
-			LOG(1, s, t, "Unknown PPP protocol %04X\n", prot);
+			LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
+				proto, ppp_state(session[s].ppp.lcp));
 		}
 	}
 }
@@ -2579,7 +2660,7 @@ static void processtun(uint8_t * buf, int len)
 	if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
 		processipout(buf, len);
 	else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
-	    && config->ipv6_prefix.s6_addr[0] > 0)
+	    && config->ipv6_prefix.s6_addr[0])
 		processipv6out(buf, len);
 
 	// Else discard.
@@ -2664,10 +2745,10 @@ static void regular_cleanups(double period)
 			}
 		}
 		// Send hello
-		if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600)
+		if (tunnel[t].state == TUNNELOPEN && (time_now - tunnel[t].lastrec) > 60)
 		{
 			controlt *c = controlnew(6); // sending HELLO
-			controladd(c, t, 0); // send the message
+			controladd(c, 0, t); // send the message
 			LOG(3, 0, t, "Sending HELLO message\n");
 			t_actions++;
 		}
@@ -2721,12 +2802,123 @@ static void regular_cleanups(double period)
 			continue;
 		}
 
-		if (session[s].ip && !(session[s].flags & SF_IPCP_ACKED))
+		// PPP timeouts
+		if (sess_local[s].lcp.restart <= time_now)
 		{
-			// IPCP has not completed yet. Resend
-			LOG(3, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n");
-			sendipcp(session[s].tunnel, s);
-			s_actions++;
+			int next_state = session[s].ppp.lcp;
+			switch (session[s].ppp.lcp)
+			{
+			case RequestSent:
+			case AckReceived:
+			    	next_state = RequestSent;
+
+			case AckSent:
+				if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
+				{
+					LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
+					sess_local[s].lcp.restart = time_now + config->ppp_restart_time;
+					sess_local[s].lcp.conf_sent++;
+					sendlcp(s, session[s].tunnel);
+					change_state(s, lcp, next_state);
+				}
+				else
+				{
+					sessionshutdown(s, "No response to LCP ConfigReq.", 3, 0);
+					STAT(session_timeout);
+				}
+
+				s_actions++;
+			}
+
+			if (session[s].die)
+				continue;
+		}
+
+		if (sess_local[s].ipcp.restart <= time_now)
+		{
+			int next_state = session[s].ppp.ipcp;
+			switch (session[s].ppp.ipcp)
+			{
+			case RequestSent:
+			case AckReceived:
+			    	next_state = RequestSent;
+
+			case AckSent:
+				if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
+				{
+					LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
+					sess_local[s].ipcp.restart = time_now + config->ppp_restart_time;
+					sess_local[s].ipcp.conf_sent++;
+					sendipcp(s, session[s].tunnel);
+					change_state(s, ipcp, next_state);
+				}
+				else
+				{
+					sessionshutdown(s, "No response to IPCP ConfigReq.", 3, 0);
+					STAT(session_timeout);
+				}
+
+				s_actions++;
+			}
+
+			if (session[s].die)
+				continue;
+		}
+
+		if (sess_local[s].ipv6cp.restart <= time_now)
+		{
+			int next_state = session[s].ppp.ipv6cp;
+			switch (session[s].ppp.ipv6cp)
+			{
+			case RequestSent:
+			case AckReceived:
+			    	next_state = RequestSent;
+
+			case AckSent:
+				if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
+				{
+					LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
+					sess_local[s].ipv6cp.restart = time_now + config->ppp_restart_time;
+					sess_local[s].ipv6cp.conf_sent++;
+					sendipv6cp(s, session[s].tunnel);
+					change_state(s, ipv6cp, next_state);
+				}
+				else
+				{
+					LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
+					change_state(s, ipv6cp, Stopped);
+				}
+
+				s_actions++;
+			}
+		}
+
+		if (sess_local[s].ccp.restart <= time_now)
+		{
+			int next_state = session[s].ppp.ccp;
+			switch (session[s].ppp.ccp)
+			{
+			case RequestSent:
+			case AckReceived:
+			    	next_state = RequestSent;
+
+			case AckSent:
+				if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
+				{
+					LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
+					sess_local[s].ccp.restart = time_now + config->ppp_restart_time;
+					sess_local[s].ccp.conf_sent++;
+					sendccp(s, session[s].tunnel);
+					change_state(s, ccp, next_state);
+				}
+				else
+				{
+					LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
+					change_state(s, ccp, Stopped);
+				}
+
+				s_actions++;
+			}
 		}
 
 		// Drop sessions who have not responded within IDLE_TIMEOUT seconds
@@ -2739,11 +2931,11 @@ static void regular_cleanups(double period)
 		}
 
 		// No data in ECHO_TIMEOUT seconds, send LCP ECHO
-		if (session[s].user[0] && (time_now - session[s].last_packet >= ECHO_TIMEOUT))
+		if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT))
 		{
-			uint8_t b[MAXCONTROL] = {0};
+			uint8_t b[MAXETHER];
 
-			uint8_t *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
+			uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP);
 			if (!q) continue;
 
 			*q = EchoReq;
@@ -2837,7 +3029,8 @@ static void regular_cleanups(double period)
 		    && !sess_local[s].radius // RADIUS already in progress
 		    && time_now - sess_local[s].last_interim >= config->radius_interim)
 		{
-			if (!(r = radiusnew(s)))
+		    	int rad = radiusnew(s);
+			if (!rad)
 			{
 				LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
 				STAT(radius_overflow);
@@ -2847,7 +3040,7 @@ static void regular_cleanups(double period)
 			LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
 				session[s].user, session[s].unique_id);
 
-			radiussend(r, RADIUSINTERIM);
+			radiussend(rad, RADIUSINTERIM);
 			sess_local[s].last_interim = time_now;
 			s_actions++;
 		}
@@ -2961,8 +3154,8 @@ static int still_busy(void)
 # include "fake_epoll.h"
 #endif
 
-// the base set of fds polled: control, cli, udp, tun, cluster
-#define BASE_FDS	5
+// the base set of fds polled: cli, cluster, tun, udp, control, dae
+#define BASE_FDS	6
 
 // additional polled fds
 #ifdef BGP
@@ -2986,8 +3179,8 @@ static void mainloop(void)
 		exit(1);
 	}
 
-	LOG(4, 0, 0, "Beginning of main loop.  udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
-		udpfd, tunfd, cluster_sockfd, controlfd);
+	LOG(4, 0, 0, "Beginning of main loop.  clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
+		clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd);
 
 	/* setup our fds to poll for input */
 	{
@@ -2997,25 +3190,29 @@ static void mainloop(void)
 		e.events = EPOLLIN;
 		i = 0;
 
-		d[i].type = FD_TYPE_CONTROL;
-		e.data.ptr = &d[i++];
-		epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
-
 		d[i].type = FD_TYPE_CLI;
 		e.data.ptr = &d[i++];
 		epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
 
-		d[i].type = FD_TYPE_UDP;
+		d[i].type = FD_TYPE_CLUSTER;
 		e.data.ptr = &d[i++];
-		epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
+		epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
 
 		d[i].type = FD_TYPE_TUN;
 		e.data.ptr = &d[i++];
 		epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
 
-		d[i].type = FD_TYPE_CLUSTER;
+		d[i].type = FD_TYPE_UDP;
 		e.data.ptr = &d[i++];
-		epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
+		epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
+
+		d[i].type = FD_TYPE_CONTROL;
+		e.data.ptr = &d[i++];
+		epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
+
+		d[i].type = FD_TYPE_DAE;
+		e.data.ptr = &d[i++];
+		epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
 	}
 
 #ifdef BGP
@@ -3038,9 +3235,17 @@ static void mainloop(void)
 		int more = 0;
 		int n;
 
+
+		if (main_reload)
+		{
+			main_reload = 0;
+			read_config_file();
+			config->reload_config++;
+		}
+
 		if (config->reload_config)
 		{
-			// Update the config state based on config settings
+			config->reload_config = 0;
 			update_config();
 		}
 
@@ -3065,7 +3270,8 @@ static void mainloop(void)
 		if (n)
 		{
 			struct sockaddr_in addr;
-			int alen, c, s;
+			socklen_t alen;
+			int c, s;
 			int udp_ready = 0;
 			int tun_ready = 0;
 			int cluster_ready = 0;
@@ -3082,12 +3288,6 @@ static void mainloop(void)
 				struct event_data *d = events[i].data.ptr;
 				switch (d->type)
 				{
-				case FD_TYPE_CONTROL: // nsctl commands
-					alen = sizeof(addr);
-					processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
-					n--;
-					break;
-
 				case FD_TYPE_CLI: // CLI connections
 				{
 					int cli;
@@ -3106,9 +3306,21 @@ static void mainloop(void)
 				}
 
 				// these are handled below, with multiple interleaved reads
-				case FD_TYPE_UDP:	udp_ready++; break;
-				case FD_TYPE_TUN:	tun_ready++; break;
 				case FD_TYPE_CLUSTER:	cluster_ready++; break;
+				case FD_TYPE_TUN:	tun_ready++; break;
+				case FD_TYPE_UDP:	udp_ready++; break;
+
+				case FD_TYPE_CONTROL: // nsctl commands
+					alen = sizeof(addr);
+					processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
+					n--;
+					break;
+
+				case FD_TYPE_DAE: // DAE requests
+					alen = sizeof(addr);
+					processdae(buf, recvfrom(daefd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
+					n--;
+					break;
 
 				case FD_TYPE_RADIUS: // RADIUS response
 					s = recv(radfds[d->index], buf, sizeof(buf), 0);
@@ -3197,6 +3409,35 @@ static void mainloop(void)
 			}
 		}
 
+		if (time_changed)
+		{
+			double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
+
+			// Log current traffic stats
+			snprintf(config->bandwidth, sizeof(config->bandwidth),
+				"UDP-ETH:%1.0f/%1.0f  ETH-UDP:%1.0f/%1.0f  TOTAL:%0.1f   IN:%u OUT:%u",
+				(udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
+				((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
+				udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
+		 
+			udp_tx = udp_rx = 0;
+			udp_rx_pkt = eth_rx_pkt = 0;
+			eth_tx = eth_rx = 0;
+			time_changed = 0;
+		 
+			if (config->dump_speed)
+				printf("%s\n", config->bandwidth);
+		 
+			// Update the internal time counter
+			strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
+		 
+			{
+				// Run timer hooks
+				struct param_timer p = { time_now };
+				run_plugins(PLUGIN_TIMER, &p);
+			}
+		}
+
 			// Runs on every machine (master and slaves).
 		if (next_cluster_ping <= TIME)
 		{
@@ -3365,7 +3606,11 @@ static void initdata(int optdebug, char *optconfig)
 	config->debug = optdebug;
 	config->num_tbfs = MAXTBFS;
 	config->rl_rate = 28; // 28kbps
+	config->cluster_mcast_ttl = 1;
  	config->cluster_master_min_adv = 1;
+	config->ppp_restart_time = 3;
+	config->ppp_max_configure = 10;
+	config->ppp_max_failure = 5;
 	strcpy(config->random_device, RANDOMDEVICE);
 
 	log_stream = stderr;
@@ -3733,7 +3978,7 @@ static void initippool()
 	LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
 }
 
-void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port)
+void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
 {
 	struct sockaddr_in snoop_addr = {0};
 	if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
@@ -3868,14 +4113,13 @@ int main(int argc, char *argv[])
 	// Start the timer routine off
 	time(&time_now);
 	strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
-	signal(SIGALRM, sigalrm_handler);
-	siginterrupt(SIGALRM, 0);
 
 	initplugins();
 	initdata(optdebug, optconfig);
 
 	init_cli(hostname);
 	read_config_file();
+	update_config();
 	init_tbf(config->num_tbfs);
 
 	LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
@@ -3929,6 +4173,13 @@ int main(int argc, char *argv[])
 	initrad();
 	initippool();
 
+	// seed prng
+	{
+		unsigned seed = time_now ^ getpid();
+		LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
+		srand(seed);
+	}
+
 	signal(SIGHUP,  sighup_handler);
 	signal(SIGCHLD, sigchild_handler);
 	signal(SIGTERM, shutdown_handler);
@@ -3944,8 +4195,6 @@ int main(int argc, char *argv[])
 			LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
 	}
 
-	alarm(1);
-
 	// Drop privileges here
 	if (config->target_uid > 0 && geteuid() == 0)
 		setuid(config->target_uid);
@@ -3967,53 +4216,11 @@ int main(int argc, char *argv[])
 
 static void sighup_handler(int sig)
 {
-	if (log_stream)
-	{
-		if (log_stream != stderr)
-			fclose(log_stream);
-
-		log_stream = NULL;
-	}
-
-	read_config_file();
-}
-
-static void sigalrm_handler(int sig)
-{
-	// Log current traffic stats
-
-	snprintf(config->bandwidth, sizeof(config->bandwidth),
-		"UDP-ETH:%1.0f/%1.0f  ETH-UDP:%1.0f/%1.0f  TOTAL:%0.1f   IN:%u OUT:%u",
-		(udp_rx / 1024.0 / 1024.0 * 8),
-		(eth_tx / 1024.0 / 1024.0 * 8),
-		(eth_rx / 1024.0 / 1024.0 * 8),
-		(udp_tx / 1024.0 / 1024.0 * 8),
-		((udp_tx + udp_rx + eth_tx + eth_rx) / 1024.0 / 1024.0 * 8),
-		udp_rx_pkt, eth_rx_pkt);
-
-	udp_tx = udp_rx = 0;
-	udp_rx_pkt = eth_rx_pkt = 0;
-	eth_tx = eth_rx = 0;
-
-	if (config->dump_speed)
-		printf("%s\n", config->bandwidth);
-
-	// Update the internal time counter
-	time(&time_now);
-	strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
-	alarm(1);
-
-	{
-		// Run timer hooks
-		struct param_timer p = { time_now };
-		run_plugins(PLUGIN_TIMER, &p);
-	}
-
+	main_reload++;
 }
 
 static void shutdown_handler(int sig)
 {
-	LOG(1, 0, 0, "Shutting down\n");
 	main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
 }
 
@@ -4023,12 +4230,12 @@ static void sigchild_handler(int sig)
 	    ;
 }
 
-static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response)
+static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
 {
 	MD5_CTX ctx;
 	*challenge_response = NULL;
 
-	if (!*config->l2tpsecret)
+	if (!*config->l2tp_secret)
 	{
 		LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
 		return;
@@ -4036,13 +4243,13 @@ static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_
 
 	LOG(4, 0, 0, "   Building challenge response for CHAP request\n");
 
-	*challenge_response = (char *)calloc(17, 1);
+	*challenge_response = calloc(17, 1);
 
-	MD5Init(&ctx);
-	MD5Update(&ctx, &id, 1);
-	MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
-	MD5Update(&ctx, challenge, challenge_length);
-	MD5Final(*challenge_response, &ctx);
+	MD5_Init(&ctx);
+	MD5_Update(&ctx, &id, 1);
+	MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
+	MD5_Update(&ctx, challenge, challenge_length);
+	MD5_Final(*challenge_response, &ctx);
 
 	return;
 }
@@ -4107,6 +4314,17 @@ static void update_config()
 		setbuf(log_stream, NULL);
 	}
 
+#define L2TP_HDRS		(20+8+6+4)	// L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
+#define TCP_HDRS		(20+20)		// TCP encapsulation: ip + tcp
+
+	if (config->l2tp_mtu <= 0)		config->l2tp_mtu = PPPMTU;
+	else if (config->l2tp_mtu < MINMTU)	config->l2tp_mtu = MINMTU;
+	else if (config->l2tp_mtu > MAXMTU)	config->l2tp_mtu = MAXMTU;
+
+	// reset MRU/MSS globals
+	MRU = config->l2tp_mtu - L2TP_HDRS;
+	MSS = MRU - TCP_HDRS;
+
 	// Update radius
 	config->numradiusservers = 0;
 	for (i = 0; i < MAXRADSERVER; i++)
@@ -4181,6 +4399,9 @@ static void update_config()
 			strcat(config->radius_authtypes_s, ", pap");
 	}
 
+	if (!config->radius_dae_port)
+		config->radius_dae_port = DAEPORT;
+
 	// re-initialise the random number source
 	initrandom(config->random_device);
 
@@ -4249,8 +4470,6 @@ static void update_config()
 			LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
 		}
 	}
-
-	config->reload_config = 0;
 }
 
 static void read_config_file()
@@ -4268,10 +4487,9 @@ static void read_config_file()
 	cli_do_file(f);
 	LOG(3, 0, 0, "Done reading config file\n");
 	fclose(f);
-	update_config();
 }
 
-int sessionsetup(tunnelidt t, sessionidt s)
+int sessionsetup(sessionidt s, tunnelidt t)
 {
 	// A session now exists, set it up
 	in_addr_t ip;
@@ -4349,13 +4567,8 @@ int sessionsetup(tunnelidt t, sessionidt s)
 			cache_ipmap(session[s].ip, s);
 	}
 
-	if (!session[s].unique_id)
-	{
-		// did this session just finish radius?
-		LOG(3, s, t, "Sending initial IPCP to client\n");
-		sendipcp(t, s);
-		session[s].unique_id = ++last_id;
-	}
+	sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
+	lcp_open(s, t); // transition to Network phase and send initial IPCP
 
 	// Run the plugin's against this new session.
 	{
@@ -4464,7 +4677,7 @@ int load_session(sessionidt s, sessiont *new)
 	}
 
 	// check v6 routing
-	if (new->flags & SF_IPV6_ROUTED && !(session[s].flags & SF_IPV6_ROUTED))
+	if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
 		    route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
 
 	// check filters
@@ -4496,12 +4709,6 @@ int load_session(sessionidt s, sessiont *new)
 					// for walking the sessions to forward byte counts to the master.
 		config->cluster_highest_sessionid = s;
 
-	// TEMP: old session struct used a uint32_t to define the throttle
-	// speed for both up/down, new uses a uint16_t for each.  Deal with
-	// sessions from an old master for migration.
-	if (new->throttle_out == 0 && new->tbf_out)
-		new->throttle_out = new->throttle_in;
-
 	memcpy(&session[s], new, sizeof(session[s]));	// Copy over..
 
 		// Do fixups into address pool.
@@ -4687,7 +4894,7 @@ static void plugins_done()
 		run_plugin_done(p);
 }
 
-static void processcontrol(uint8_t * buf, int len, struct sockaddr_in *addr, int alen)
+static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
 {
 	struct nsctl request;
 	struct nsctl response;
@@ -5008,14 +5215,14 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec
 	uint8_t digest[16];
 	uint8_t *last;
 	size_t d = 0;
+	uint16_t m = htons(type);
 
 	// Compute initial pad
-	MD5Init(&ctx);
-	MD5Update(&ctx, (uint8_t) (type >> 8) & 0xff, 1);
-	MD5Update(&ctx, (uint8_t)  type       & 0xff, 1);
-	MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
-	MD5Update(&ctx, vector, vec_len);
-	MD5Final(digest, &ctx);
+	MD5_Init(&ctx);
+	MD5_Update(&ctx, (unsigned char *) &m, 2);
+	MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
+	MD5_Update(&ctx, vector, vec_len);
+	MD5_Final(digest, &ctx);
 
 	// pointer to last decoded 16 octets
 	last = value;
@@ -5025,10 +5232,10 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec
 		// calculate a new pad based on the last decoded block
 		if (d >= sizeof(digest))
 		{
-			MD5Init(&ctx);
-			MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
-			MD5Update(&ctx, last, sizeof(digest));
-			MD5Final(digest, &ctx);
+			MD5_Init(&ctx);
+			MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
+			MD5_Update(&ctx, last, sizeof(digest));
+			MD5_Final(digest, &ctx);
 
 			d = 0;
 			last = value;
@@ -5039,6 +5246,31 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec
 	}
 }
 
+int find_filter(char const *name, size_t len)
+{
+	int free = -1;
+	int i;
+
+	for (i = 0; i < MAXFILTER; i++)
+	{
+	    	if (!*ip_filters[i].name)
+		{
+			if (free < 0)
+				free = i;
+
+			continue;
+		}
+
+		if (strlen(ip_filters[i].name) != len)
+			continue;
+
+		if (!strncmp(ip_filters[i].name, name, len))
+			return i;
+	}
+			
+	return free;
+}
+
 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
 {
 	switch (p->op)