Make sure IPv6 sockets are IPv6 only.

[tinc] / src / net_socket.c

diff --git a/src/net_socket.c b/src/net_socket.c
index c2c1da9..808e1c6 100644 (file)
--- a/src/net_socket.c
+++ b/src/net_socket.c
@@ -70,12 +70,12 @@ static void configure_tcp(connection_t *c) {
 
 #if defined(SOL_TCP) && defined(TCP_NODELAY)
        option = 1;
-       setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
+       setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof option);
 #endif
 
 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
        option = IPTOS_LOWDELAY;
-       setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
+       setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof option);
 #endif
 }
 
@@ -97,17 +97,22 @@ int setup_listen_socket(const sockaddr_t *sa) {
        /* Optimize TCP settings */
 
        option = 1;
-       setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
+       setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof option);
+
+#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
+       if(sa->sa.sa_family == AF_INET6)
+               setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
+#endif
 
        if(get_config_string
           (lookup_config(config_tree, "BindToInterface"), &iface)) {
 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
                struct ifreq ifr;
 
-               memset(&ifr, 0, sizeof(ifr));
+               memset(&ifr, 0, sizeof ifr);
                strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
 
-               if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
+               if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof ifr)) {
                        closesocket(nfd);
                        logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
                                   strerror(errno));
@@ -175,7 +180,12 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
 #endif
 
        option = 1;
-       setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
+       setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof option);
+
+#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
+       if(sa->sa.sa_family == AF_INET6)
+               setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
+#endif
 
 #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
        {
@@ -183,7 +193,7 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
 
                if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice) {
                        option = IP_PMTUDISC_DO;
-                       setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, &option, sizeof(option));
+                       setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, &option, sizeof option);
                }
        }
 #endif
@@ -194,7 +204,7 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
 
                if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice) {
                        option = IPV6_PMTUDISC_DO;
-                       setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, &option, sizeof(option));
+                       setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, &option, sizeof option);
                }
        }
 #endif
@@ -205,10 +215,10 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
                struct ifreq ifr;
 
                if(get_config_string(lookup_config(config_tree, "BindToInterface"), &iface)) {
-                       memset(&ifr, 0, sizeof(ifr));
+                       memset(&ifr, 0, sizeof ifr);
                        strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
 
-                       if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
+                       if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof ifr)) {
                                closesocket(nfd);
                                logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
                                           strerror(errno));
@@ -320,6 +330,12 @@ begin:
                goto begin;
        }
 
+#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
+       int option = 1;
+       if(c->address.sa.sa_family == AF_INET6)
+               setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
+#endif
+
        /* Optimize TCP settings */
 
        configure_tcp(c);
@@ -426,7 +442,7 @@ void handle_new_meta_connection(int sock, short events, void *data) {
        connection_t *c;
        sockaddr_t sa;
        int fd;
-       socklen_t len = sizeof(sa);
+       socklen_t len = sizeof sa;
 
        cp();
 
@@ -488,7 +504,7 @@ void try_outgoing_connections(void) {
                        continue;
                }
 
-               outgoing = xmalloc_and_zero(sizeof(*outgoing));
+               outgoing = xmalloc_and_zero(sizeof *outgoing);
                outgoing->name = name;
                setup_outgoing_connection(outgoing);
        }