* Perform AF-independent joining of multicast receive addresses.
*
* \param fd Bound socket descriptor.
+ * \param iface The receiving multicast interface, or NULL for the default.
*
* \return Zero if okay, negative on error.
*/
-static int mcast_receiver_setup(int fd)
+static int mcast_receiver_setup(int fd, const char *iface)
{
struct sockaddr_storage ss;
socklen_t sslen = sizeof(ss);
+ int id = iface == NULL ? 0 : if_nametoindex(iface);
if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0)
goto err;
+ if (iface != NULL && id == 0)
+ PARA_WARNING_LOG("could not resolve interface %s, using default", iface);
+
switch (ss.ss_family) {
case AF_INET:
if (IN_MULTICAST(htonl(((struct sockaddr_in *)&ss)->sin_addr.s_addr))) {
+#ifdef HAVE_IP_MREQN
+ struct ip_mreqn m4;
+
+ m4.imr_address.s_addr = INADDR_ANY;
+ m4.imr_ifindex = id;
+#else
struct ip_mreq m4;
- memset(&m4, 0, sizeof(m4));
- m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
+ m4.imr_interface.s_addr = INADDR_ANY;
+ if (id != 0)
+ PARA_ERROR_LOG("Setting IPv4 receiver mcast interface not supported.");
+
+#endif
+ m4.imr_multiaddr = ((struct sockaddr_in *)&ss)->sin_addr;
+
if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &m4, sizeof(m4)) < 0)
break;
}
memset(&m6, 0, sizeof(m6));
memcpy(&m6.ipv6mr_multiaddr, &((struct sockaddr_in6 *)&ss)->sin6_addr, 16);
+ m6.ipv6mr_interface = id;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &m6, sizeof(m6)) < 0)
break;
}
{
struct private_udp_recv_data *purd;
struct udp_recv_args_info *c = rn->conf;
+ char *iface = c->iface_given ? c->iface_arg : NULL;
int ret;
rn->buf = para_calloc(UDP_RECV_CHUNK_SIZE);
goto err;
purd->fd = ret;
- ret = mcast_receiver_setup(purd->fd);
+ ret = mcast_receiver_setup(purd->fd, iface);
if (ret < 0) {
close(purd->fd);
return ret;