X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet_packet.c;h=b50ddc4f27f48114061674dadf2416dc4d90d888;hb=4c68a8cb60eb0a4c05d9ce98963b930a976b55ee;hp=77e29c0a9deeda77080d1208ec7edbadc4324c2c;hpb=075e6828a7533e7daa790225f17aa6bb39703278;p=tinc

diff --git a/src/net_packet.c b/src/net_packet.c
index 77e29c0a..b50ddc4f 100644
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -13,11 +13,9 @@
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-    $Id$
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #include "system.h"
@@ -44,10 +42,6 @@
 #include "utils.h"
 #include "xalloc.h"
 
-#ifdef WSAEMSGSIZE
-#define EMSGSIZE WSAEMSGSIZE
-#endif
-
 int keylifetime = 0;
 int keyexpires = 0;
 static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS];
@@ -56,33 +50,61 @@ static void send_udppacket(node_t *, vpn_packet_t *);
 
 #define MAX_SEQNO 1073741824
 
+// mtuprobes == 1..30: initial discovery, send bursts with 1 second interval
+// mtuprobes ==    31: sleep pinginterval seconds
+// mtuprobes ==    32: send 1 burst, sleep pingtimeout second
+// mtuprobes ==    33: no response from other side, restart PMTU discovery process
+
 static void send_mtu_probe_handler(int fd, short events, void *data) {
 	node_t *n = data;
 	vpn_packet_t packet;
 	int len, i;
+	int timeout = 1;
 	
-	cp();
-
 	n->mtuprobes++;
 
-	if(!n->status.reachable) {
-		logger(LOG_DEBUG, _("Trying to send MTU probe to unreachable node %s (%s)"), n->name, n->hostname);
+	if(!n->status.reachable || !n->status.validkey) {
+		ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send MTU probe to unreachable or rekeying node %s (%s)", n->name, n->hostname);
+		n->mtuprobes = 0;
 		return;
 	}
 
+	if(n->mtuprobes > 32) {
+		ifdebug(TRAFFIC) logger(LOG_INFO, "%s (%s) did not respond to UDP ping, restarting PMTU discovery", n->name, n->hostname);
+		n->mtuprobes = 1;
+		n->minmtu = 0;
+		n->maxmtu = MTU;
+	}
+
 	if(n->mtuprobes >= 10 && !n->minmtu) {
-		ifdebug(TRAFFIC) logger(LOG_INFO, _("No response to MTU probes from %s (%s)"), n->name, n->hostname);
+		ifdebug(TRAFFIC) logger(LOG_INFO, "No response to MTU probes from %s (%s)", n->name, n->hostname);
+		n->mtuprobes = 0;
 		return;
 	}
 
+	if(n->mtuprobes == 30 || (n->mtuprobes < 30 && n->minmtu >= n->maxmtu)) {
+		if(n->minmtu > n->maxmtu)
+			n->minmtu = n->maxmtu;
+		else
+			n->maxmtu = n->minmtu;
+		n->mtu = n->minmtu;
+		ifdebug(TRAFFIC) logger(LOG_INFO, "Fixing MTU of %s (%s) to %d after %d probes", n->name, n->hostname, n->mtu, n->mtuprobes);
+		n->mtuprobes = 31;
+	}
+
+	if(n->mtuprobes == 31) {
+		timeout = pinginterval;
+		goto end;
+	} else if(n->mtuprobes == 32) {
+		timeout = pingtimeout;
+	}
+
 	for(i = 0; i < 3; i++) {
-		if(n->mtuprobes >= 30 || n->minmtu >= n->maxmtu) {
-			n->mtu = n->minmtu;
-			ifdebug(TRAFFIC) logger(LOG_INFO, _("Fixing MTU of %s (%s) to %d after %d probes"), n->name, n->hostname, n->mtu, n->mtuprobes);
-			return;
-		}
+		if(n->maxmtu <= n->minmtu)
+			len = n->maxmtu;
+		else
+			len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu);
 
-		len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu);
 		if(len < 64)
 			len = 64;
 		
@@ -91,12 +113,13 @@ static void send_mtu_probe_handler(int fd, short events, void *data) {
 		packet.len = len;
 		packet.priority = 0;
 
-		ifdebug(TRAFFIC) logger(LOG_INFO, _("Sending MTU probe length %d to %s (%s)"), len, n->name, n->hostname);
+		ifdebug(TRAFFIC) logger(LOG_INFO, "Sending MTU probe length %d to %s (%s)", len, n->name, n->hostname);
 
 		send_udppacket(n, &packet);
 	}
 
-	event_add(&n->mtuevent, &(struct timeval){1, 0});
+end:
+	event_add(&n->mtuevent, &(struct timeval){timeout, 0});
 }
 
 void send_mtu_probe(node_t *n) {
@@ -106,14 +129,18 @@ void send_mtu_probe(node_t *n) {
 }
 
 void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) {
-	ifdebug(TRAFFIC) logger(LOG_INFO, _("Got MTU probe length %d from %s (%s)"), packet->len, n->name, n->hostname);
+	ifdebug(TRAFFIC) logger(LOG_INFO, "Got MTU probe length %d from %s (%s)", packet->len, n->name, n->hostname);
 
 	if(!packet->data[0]) {
 		packet->data[0] = 1;
-		send_packet(n, packet);
+		send_udppacket(n, packet);
 	} else {
+		if(len > n->maxmtu)
+			len = n->maxmtu;
 		if(n->minmtu < len)
 			n->minmtu = len;
+		if(n->mtuprobes > 30)
+			n->mtuprobes = 30;
 	}
 }
 
@@ -158,24 +185,20 @@ static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t
 /* VPN packet I/O */
 
 static void receive_packet(node_t *n, vpn_packet_t *packet) {
-	cp();
-
-	ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"),
+	ifdebug(TRAFFIC) logger(LOG_DEBUG, "Received packet of %d bytes from %s (%s)",
 			   packet->len, n->name, n->hostname);
 
 	route(n, packet);
 }
 
-static bool try_mac(node_t *n, const vpn_packet_t *inpkt)
-{
+static bool try_mac(node_t *n, const vpn_packet_t *inpkt) {
 	if(!digest_active(&n->indigest) || inpkt->len < sizeof inpkt->seqno + digest_length(&n->indigest))
 		return false;
 
-	return digest_verify(&n->indigest, &inpkt->seqno, inpkt->len, (const char *)&inpkt->seqno + inpkt->len);
+	return digest_verify(&n->indigest, &inpkt->seqno, inpkt->len - n->indigest.maclength, (const char *)&inpkt->seqno + inpkt->len - n->indigest.maclength);
 }
 
-static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
-{
+static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) {
 	vpn_packet_t pkt1, pkt2;
 	vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
 	int nextpkt = 0;
@@ -183,10 +206,8 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
 	size_t outlen;
 	int i;
 
-	cp();
-
 	if(!cipher_active(&n->incipher)) {
-		ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got packet from %s (%s) but he hasn't got our key yet"),
+		ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet",
 					n->name, n->hostname);
 		return;
 	}
@@ -194,18 +215,20 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
 	/* Check packet length */
 
 	if(inpkt->len < sizeof inpkt->seqno + digest_length(&n->indigest)) {
-		ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got too short packet from %s (%s)"),
+		ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got too short packet from %s (%s)",
 					n->name, n->hostname);
 		return;
 	}
 
 	/* Check the message authentication code */
 
-	if(digest_active(&n->indigest) && !digest_verify(&n->indigest, &inpkt->seqno, inpkt->len, (const char *)&inpkt->seqno + inpkt->len)) {
-		ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), n->name, n->hostname);
-		return;
+	if(digest_active(&n->indigest)) {
+		inpkt->len -= n->indigest.maclength;
+ 		if(!digest_verify(&n->indigest, &inpkt->seqno, inpkt->len, (const char *)&inpkt->seqno + inpkt->len)) {
+			ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got unauthenticated packet from %s (%s)", n->name, n->hostname);
+			return;
+		}
 	}
-
 	/* Decrypt the packet */
 
 	if(cipher_active(&n->incipher)) {
@@ -213,7 +236,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
 		outlen = MAXSIZE;
 
 		if(!cipher_decrypt(&n->incipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) {
-			ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s)"), n->name, n->hostname);
+			ifdebug(TRAFFIC) logger(LOG_DEBUG, "Error decrypting packet from %s (%s)", n->name, n->hostname);
 			return;
 		}
 		
@@ -228,13 +251,13 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
 
 	if(inpkt->seqno != n->received_seqno + 1) {
 		if(inpkt->seqno >= n->received_seqno + sizeof n->late * 8) {
-			logger(LOG_WARNING, _("Lost %d packets from %s (%s)"),
+			logger(LOG_WARNING, "Lost %d packets from %s (%s)",
 					   inpkt->seqno - n->received_seqno - 1, n->name, n->hostname);
 			
 			memset(n->late, 0, sizeof n->late);
 		} else if (inpkt->seqno <= n->received_seqno) {
 			if((n->received_seqno >= sizeof n->late * 8 && inpkt->seqno <= n->received_seqno - sizeof n->late * 8) || !(n->late[(inpkt->seqno / 8) % sizeof n->late] & (1 << inpkt->seqno % 8))) {
-				logger(LOG_WARNING, _("Got late or replayed packet from %s (%s), seqno %d, last received %d"),
+				logger(LOG_WARNING, "Got late or replayed packet from %s (%s), seqno %d, last received %d",
 					   n->name, n->hostname, inpkt->seqno, n->received_seqno);
 				return;
 			}
@@ -260,7 +283,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
 		outpkt = pkt[nextpkt++];
 
 		if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, n->incompression)) < 0) {
-			ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while uncompressing packet from %s (%s)"),
+			ifdebug(TRAFFIC) logger(LOG_ERR, "Error while uncompressing packet from %s (%s)",
 				  		 n->name, n->hostname);
 			return;
 		}
@@ -281,8 +304,6 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
 void receive_tcppacket(connection_t *c, char *buffer, int len) {
 	vpn_packet_t outpkt;
 
-	cp();
-
 	outpkt.len = len;
 	if(c->options & OPTION_TCPONLY)
 		outpkt.priority = 0;
@@ -305,10 +326,8 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 	int origpriority;
 	int sock;
 
-	cp();
-
 	if(!n->status.reachable) {
-		ifdebug(TRAFFIC) logger(LOG_INFO, _("Trying to send UDP packet to unreachable node %s (%s)"), n->name, n->hostname);
+		ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname);
 		return;
 	}
 
@@ -316,7 +335,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 
 	if(!n->status.validkey) {
 		ifdebug(TRAFFIC) logger(LOG_INFO,
-				   _("No valid key known yet for %s (%s), forwarding via TCP"),
+				   "No valid key known yet for %s (%s), forwarding via TCP",
 				   n->name, n->hostname);
 
 		if(!n->status.waitingforkey)
@@ -331,10 +350,13 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 
 	if(n->options & OPTION_PMTU_DISCOVERY && inpkt->len > n->minmtu && (inpkt->data[12] | inpkt->data[13])) {
 		ifdebug(TRAFFIC) logger(LOG_INFO,
-				_("Packet for %s (%s) larger than minimum MTU, forwarding via TCP"),
-				n->name, n->hostname);
+				"Packet for %s (%s) larger than minimum MTU, forwarding via %s",
+				n->name, n->hostname, n != n->nexthop ? n->nexthop->name : "TCP");
 
-		send_tcppacket(n->nexthop->connection, origpkt);
+		if(n != n->nexthop)
+			send_packet(n->nexthop, origpkt);
+		else
+			send_tcppacket(n->nexthop->connection, origpkt);
 
 		return;
 	}
@@ -348,7 +370,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 		outpkt = pkt[nextpkt++];
 
 		if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->outcompression)) < 0) {
-			ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while compressing packet to %s (%s)"),
+			ifdebug(TRAFFIC) logger(LOG_ERR, "Error while compressing packet to %s (%s)",
 				   n->name, n->hostname);
 			return;
 		}
@@ -368,7 +390,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 		outlen = MAXSIZE;
 
 		if(!cipher_encrypt(&n->outcipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) {
-			ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s)"), n->name, n->hostname);
+			ifdebug(TRAFFIC) logger(LOG_ERR, "Error while encrypting packet to %s (%s)", n->name, n->hostname);
 			goto end;
 		}
 
@@ -398,20 +420,20 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 	if(priorityinheritance && origpriority != priority
 	   && listen_socket[sock].sa.sa.sa_family == AF_INET) {
 		priority = origpriority;
-		ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Setting outgoing packet priority to %d"), priority);
+		ifdebug(TRAFFIC) logger(LOG_DEBUG, "Setting outgoing packet priority to %d", priority);
 		if(setsockopt(listen_socket[sock].udp, SOL_IP, IP_TOS, &priority, sizeof priority))	/* SO_PRIORITY doesn't seem to work */
-			logger(LOG_ERR, _("System call `%s' failed: %s"), "setsockopt", strerror(errno));
+			logger(LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno));
 	}
 #endif
 
-	if((sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0) {
-		if(errno == EMSGSIZE) {
+	if(sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa)) < 0 && !sockwouldblock(sockerrno)) {
+		if(sockmsgsize(sockerrno)) {
 			if(n->maxmtu >= origlen)
 				n->maxmtu = origlen - 1;
 			if(n->mtu >= origlen)
 				n->mtu = origlen - 1;
 		} else
-			logger(LOG_ERR, _("Error sending packet to %s (%s): %s"), n->name, n->hostname, strerror(errno));
+			logger(LOG_ERR, "Error sending packet to %s (%s): %s", n->name, n->hostname, sockstrerror(sockerrno));
 	}
 
 end:
@@ -424,8 +446,6 @@ end:
 void send_packet(const node_t *n, vpn_packet_t *packet) {
 	node_t *via;
 
-	cp();
-
 	if(n == myself) {
 		if(overwrite_mac)
 			 memcpy(packet->data, mymac.x, ETH_ALEN);
@@ -433,11 +453,11 @@ void send_packet(const node_t *n, vpn_packet_t *packet) {
 		return;
 	}
 
-	ifdebug(TRAFFIC) logger(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
+	ifdebug(TRAFFIC) logger(LOG_ERR, "Sending packet of %d bytes to %s (%s)",
 			   packet->len, n->name, n->hostname);
 
 	if(!n->status.reachable) {
-		ifdebug(TRAFFIC) logger(LOG_INFO, _("Node %s (%s) is not reachable"),
+		ifdebug(TRAFFIC) logger(LOG_INFO, "Node %s (%s) is not reachable",
 				   n->name, n->hostname);
 		return;
 	}
@@ -445,7 +465,7 @@ void send_packet(const node_t *n, vpn_packet_t *packet) {
 	via = (packet->priority == -1 || n->via == myself) ? n->nexthop : n->via;
 
 	if(via != n)
-		ifdebug(TRAFFIC) logger(LOG_INFO, _("Sending packet to %s via %s (%s)"),
+		ifdebug(TRAFFIC) logger(LOG_INFO, "Sending packet to %s via %s (%s)",
 			   n->name, via->name, n->via->hostname);
 
 	if(packet->priority == -1 || ((myself->options | via->options) & OPTION_TCPONLY)) {
@@ -461,9 +481,7 @@ void broadcast_packet(const node_t *from, vpn_packet_t *packet) {
 	splay_node_t *node;
 	connection_t *c;
 
-	cp();
-
-	ifdebug(TRAFFIC) logger(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"),
+	ifdebug(TRAFFIC) logger(LOG_INFO, "Broadcasting packet of %d bytes from %s (%s)",
 			   packet->len, from->name, from->hostname);
 
 	if(from != myself) {
@@ -485,46 +503,48 @@ void broadcast_packet(const node_t *from, vpn_packet_t *packet) {
 
 static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) {
 	splay_node_t *node;
-	edge_t *e;
-	node_t *n = NULL;
-
-	for(node = edge_weight_tree->head; node; node = node->next) {
-		e = node->data;
+	node_t *n, *found = NULL;
+	static time_t last_hard_try = 0;
+	time_t now = time(NULL);
 
-		if(sockaddrcmp_noport(from, &e->address))
-			continue;
+	if(last_hard_try == now)
+		return NULL;
+	else
+		last_hard_try = now;
 
-		if(!n)
-			n = e->to;
+	for(node = node_tree->head; node; node = node->next) {
+		n = node->data;
 
-		if(!try_mac(e->to, pkt))
+		if(n == myself || !n->status.reachable || !digest_active(&n->indigest))
 			continue;
 
-		n = e->to;
-		break;
+		if(try_mac(n, pkt)) {
+			found = n;
+			break;
+		}
 	}
 
-	return n;
+	return found;
 }
 
-void handle_incoming_vpn_data(int sock, short events, void *data)
-{
+void handle_incoming_vpn_data(int sock, short events, void *data) {
 	vpn_packet_t pkt;
 	char *hostname;
 	sockaddr_t from;
 	socklen_t fromlen = sizeof from;
 	node_t *n;
+	int len;
 
-	cp();
+	len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen);
 
-	pkt.len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen);
-
-	if(pkt.len < 0) {
-		if(errno != EAGAIN && errno != EINTR)
-			logger(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno));
+	if(len <= 0 || len > MAXSIZE) {
+		if(!sockwouldblock(sockerrno))
+			logger(LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno));
 		return;
 	}
 
+	pkt.len = len;
+
 	sockaddrunmap(&from);		/* Some braindead IPv6 implementations do stupid things. */
 
 	n = lookup_node_udp(&from);
@@ -535,7 +555,7 @@ void handle_incoming_vpn_data(int sock, short events, void *data)
 			update_node_udp(n, &from);
 		else ifdebug(PROTOCOL) {
 			hostname = sockaddr2hostname(&from);
-			logger(LOG_WARNING, _("Received UDP packet from unknown source %s"), hostname);
+			logger(LOG_WARNING, "Received UDP packet from unknown source %s", hostname);
 			free(hostname);
 			return;
 		}