When joining a multicast group with ifindex == 0, we get to
ipv6_sock_mc_join() which uses the routing table to find an interface when
the index doesn't specify one.
The code also saves the interface index (as passed by the user) in
mc_list.
When leaving a multicast group, we call ipv6_sock_mc_drop(), which
has this code
> if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
> ipv6_dev_mc_dec(dev, &mc_lst->addr);
> dev_put(dev);
> }
In the case where ifindex passed was 0, this won't find the interface
we added the multicast address to, won't remove the reference, etc.
+-DLS
Fix:
In ipv6_sock_mc_join(), set the mc_list index based on the device we
actually use:
diff -urN linux/net/ipv6/mcast.c linux.NEW/net/ipv6/mcast.c
--- linux/net/ipv6/mcast.c Thu Apr 26 22:17:26 2001
+++ linux.NEW/net/ipv6/mcast.c Tue Aug 14 17:01:42 2001
@@ -90,7 +90,6 @@
mc_lst->next = NULL;
memcpy(&mc_lst->addr, addr, sizeof(struct in6_addr));
- mc_lst->ifindex = ifindex;
if (ifindex == 0) {
struct rt6_info *rt;
@@ -107,6 +106,8 @@
sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
return -ENODEV;
}
+
+ mc_lst->ifindex = dev->ifindex;
/*
* now add/increase the group membership on the device
-
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