ip: fix mc_loop checks for tunnels with multicast outer addresses

When we have L3 tunnels with different inner/outer families
(i.e. IPV4/IPV6) which use a multicast address as the outer tunnel
destination address, multicast packets will be loopbacked back to the
sending socket even if IP*_MULTICAST_LOOP is set to disabled.

The mc_loop flag is present in the family specific part of the socket
(e.g. the IPv4 or IPv4 specific part).  setsockopt sets the inner
family mc_loop flag. When the packet is pushed through the L3 tunnel
it will eventually be processed by the outer family which if different
will check the flag in a different part of the socket then it was set.

Signed-off-by: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 2 deletions

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index cd48801a8d6f..eb6d09728633 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -121,10 +121,9 @@ static int ip6_output2(struct sk_buff *skb)
         skb->dev = dev;
 
         if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
-                struct ipv6_pinfo* np = skb->sk ? inet6_sk(skb->sk) : NULL;
                 struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
 
-                if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) &&
+                if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(skb->sk) &&
                     ((mroute6_socket(dev_net(dev)) &&
                      !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
                      ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,