X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=avahi-core%2Fsocket.c;h=82622d3bd0ffed5f6c7a64000af6908459b92386;hb=7c171df2b2ae4d3f2cbab669d5b5b96562bdd9a8;hp=184fa1b9dbf088fd0e739b5d16747fc61c1d1ba1;hpb=7ba2b1fcc731085127c9976b1bae4aaaa5b8b7a7;p=catta

diff --git a/avahi-core/socket.c b/avahi-core/socket.c
index 184fa1b..82622d3 100644
--- a/avahi-core/socket.c
+++ b/avahi-core/socket.c
@@ -125,6 +125,12 @@ int avahi_mdns_mcast_join_ipv4(int fd, const AvahiIPv4Address *a, int idx, int j
     mdns_mcast_group_ipv4(&sa);
     mreq.imr_multiaddr = sa.sin_addr;
 
+    /* Some network drivers have issues with dropping membership of
+     * mcast groups when the iface is down, but don't allow rejoining
+     * when it comes back up. This is an ugly workaround */
+    if (join)
+        setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
+
     if (setsockopt(fd, IPPROTO_IP, join ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
         avahi_log_warn("%s failed: %s", join ? "IP_ADD_MEMBERSHIP" : "IP_DROP_MEMBERSHIP", strerror(errno));
         return -1;
@@ -146,6 +152,9 @@ int avahi_mdns_mcast_join_ipv6(int fd, const AvahiIPv6Address *a, int idx, int j
     mreq6.ipv6mr_multiaddr = sa6.sin6_addr;
     mreq6.ipv6mr_interface = idx;
 
+    if (join)
+        setsockopt(fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6));
+    
     if (setsockopt(fd, IPPROTO_IPV6, join ? IPV6_ADD_MEMBERSHIP : IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
         avahi_log_warn("%s failed: %s", join ? "IPV6_ADD_MEMBERSHIP" : "IPV6_DROP_MEMBERSHIP", strerror(errno));
         return -1;