X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet_packet.c;h=05336b0f2265d4a097c7aff4047761b095d40b08;hp=40d945181d72c2a8b728e27e77c1fb8b7cff1fa6;hb=a227843b739d279b63adcf3736ebb03d856080c4;hpb=4e9e3ca89dba68cbacaaa15ddfb298b181a969da

diff --git a/src/net_packet.c b/src/net_packet.c
index 40d94518..05336b0f 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"
@@ -60,16 +58,18 @@ static void send_udppacket(node_t *, vpn_packet_t *);
 
 #define MAX_SEQNO 1073741824
 
-void send_mtu_probe(node_t *n)
-{
+void send_mtu_probe(node_t *n) {
 	vpn_packet_t packet;
 	int len, i;
 	
-	cp();
-
 	n->mtuprobes++;
 	n->mtuevent = NULL;
 
+	if(!n->status.reachable) {
+		logger(LOG_DEBUG, _("Trying to send MTU probe to unreachable node %s (%s)"), n->name, n->hostname);
+		return;
+	}
+
 	if(n->mtuprobes >= 10 && !n->minmtu) {
 		ifdebug(TRAFFIC) logger(LOG_INFO, _("No response to MTU probes from %s (%s)"), n->name, n->hostname);
 		return;
@@ -82,7 +82,7 @@ void send_mtu_probe(node_t *n)
 			return;
 		}
 
-		len = n->minmtu + 1 + random() % (n->maxmtu - n->minmtu);
+		len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu);
 		if(len < 64)
 			len = 64;
 		
@@ -115,8 +115,7 @@ void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) {
 	}
 }
 
-static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level)
-{
+static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) {
 	if(level == 10) {
 		lzo_uint lzolen = MAXSIZE;
 		lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem);
@@ -136,8 +135,7 @@ static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t l
 	return -1;
 }
 
-static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level)
-{
+static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) {
 	if(level > 9) {
 		lzo_uint lzolen = MAXSIZE;
 		if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK)
@@ -157,18 +155,14 @@ 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();
-
+static void receive_packet(node_t *n, vpn_packet_t *packet) {
 	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(const node_t *n, const vpn_packet_t *inpkt)
-{
+static bool try_mac(const node_t *n, const vpn_packet_t *inpkt) {
 	unsigned char hmac[EVP_MAX_MD_SIZE];
 
 	if(!n->indigest || !n->inmaclength || !n->inkey || inpkt->len < sizeof inpkt->seqno + n->inmaclength)
@@ -179,8 +173,7 @@ static bool try_mac(const node_t *n, const vpn_packet_t *inpkt)
 	return !memcmp(hmac, (char *) &inpkt->seqno + inpkt->len - n->inmaclength, n->inmaclength);
 }
 
-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;
@@ -189,8 +182,6 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
 	unsigned char hmac[EVP_MAX_MD_SIZE];
 	int i;
 
-	cp();
-
 	if(!n->inkey) {
 		ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got packet from %s (%s) but he hasn't got our key yet"),
 					n->name, n->hostname);
@@ -297,12 +288,9 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
 		receive_packet(n, inpkt);
 }
 
-void receive_tcppacket(connection_t *c, char *buffer, int len)
-{
+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;
@@ -313,8 +301,7 @@ void receive_tcppacket(connection_t *c, char *buffer, int len)
 	receive_packet(c->node, &outpkt);
 }
 
-static void send_udppacket(node_t *n, vpn_packet_t *origpkt)
-{
+static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 	vpn_packet_t pkt1, pkt2;
 	vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
 	vpn_packet_t *inpkt = origpkt;
@@ -326,7 +313,10 @@ 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);
+		return;
+	}
 
 	/* Make sure we have a valid key */
 
@@ -345,9 +335,9 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt)
 		return;
 	}
 
-	if(n->options & OPTION_PMTU_DISCOVERY && !n->minmtu && (inpkt->data[12] | inpkt->data[13])) {
+	if(n->options & OPTION_PMTU_DISCOVERY && inpkt->len > n->minmtu && (inpkt->data[12] | inpkt->data[13])) {
 		ifdebug(TRAFFIC) logger(LOG_INFO,
-				_("No minimum MTU established yet for %s (%s), forwarding via TCP"),
+				_("Packet for %s (%s) larger than minimum MTU, forwarding via TCP"),
 				n->name, n->hostname);
 
 		send_tcppacket(n->nexthop->connection, origpkt);
@@ -441,12 +431,9 @@ end:
 /*
   send a packet to the given vpn ip.
 */
-void send_packet(const node_t *n, vpn_packet_t *packet)
-{
+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);
@@ -478,13 +465,10 @@ void send_packet(const node_t *n, vpn_packet_t *packet)
 
 /* Broadcast a packet using the minimum spanning tree */
 
-void broadcast_packet(const node_t *from, vpn_packet_t *packet)
-{
+void broadcast_packet(const node_t *from, vpn_packet_t *packet) {
 	avl_node_t *node;
 	connection_t *c;
 
-	cp();
-
 	ifdebug(TRAFFIC) logger(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"),
 			   packet->len, from->name, from->hostname);
 
@@ -529,20 +513,18 @@ static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) {
 	return n;
 }
 
-void handle_incoming_vpn_data(int sock)
-{
+void handle_incoming_vpn_data(int sock) {
 	vpn_packet_t pkt;
 	char *hostname;
 	sockaddr_t from;
 	socklen_t fromlen = sizeof(from);
 	node_t *n;
 
-	cp();
-
 	pkt.len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen);
 
 	if(pkt.len < 0) {
-		logger(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno));
+		if(errno != EAGAIN && errno != EINTR)
+			logger(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno));
 		return;
 	}