Send packets back using the same socket as they were received on.

diff --git a/src/net_packet.c b/src/net_packet.c
index 54deb26..360f318 100644 (file)
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -389,7 +389,6 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
        static int priority = 0;
 #endif
        int origpriority;
-       int sock;
 
        if(!n->status.reachable) {
                ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname);
@@ -476,26 +475,28 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 
        /* Determine which socket we have to use */
 
-       for(sock = 0; sock < listen_sockets; sock++)
-               if(n->address.sa.sa_family == listen_socket[sock].sa.sa.sa_family)
-                       break;
-
-       if(sock >= listen_sockets)
-               sock = 0;                               /* If none is available, just use the first and hope for the best. */
+       if(n->address.sa.sa_family != listen_socket[n->sock].sa.sa.sa_family) {
+               for(int sock = 0; sock < listen_sockets; sock++) {
+                       if(n->address.sa.sa_family == listen_socket[sock].sa.sa.sa_family) {
+                               n->sock = sock;
+                               break;
+                       }
+               }
+       }
 
        /* Send the packet */
 
 #if defined(SOL_IP) && defined(IP_TOS)
        if(priorityinheritance && origpriority != priority
-          && listen_socket[sock].sa.sa.sa_family == AF_INET) {
+          && listen_socket[n->sock].sa.sa.sa_family == AF_INET) {
                priority = origpriority;
                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 */
+               if(setsockopt(listen_socket[n->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));
        }
 #endif
 
-       if(sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa)) < 0 && !sockwouldblock(sockerrno)) {
+       if(sendto(listen_socket[n->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;
@@ -635,5 +636,7 @@ void handle_incoming_vpn_data(int sock) {
                        return;
        }
 
+       n->sock = sock;
+
        receive_udppacket(n, &pkt);
 }

diff --git a/src/node.h b/src/node.h
index 07c7c49..66cb6c6 100644 (file)
--- a/src/node.h
+++ b/src/node.h
@@ -40,6 +40,7 @@ typedef struct node_t {
        char *name;                             /* name of this node */
        uint32_t options;                       /* options turned on for this node */
 
+       int sock;                               /* Socket to use for outgoing UDP packets */
        sockaddr_t address;                     /* his real (internet) ip to send UDP packets to */
        char *hostname;                         /* the hostname of its real ip */