[IPV4]: (INCLUDE,empty)/leave-group equivalence for full-state MSF APIs & errno fix

1) Adds (INCLUDE, empty)/leave-group equivalence to the full-state 
   multicast source filter APIs (IPv4 and IPv6)

2) Fixes an incorrect errno in the IPv6 leave-group (ENOENT should be
   EADDRNOTAVAIL)

Signed-off-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 1 deletions

diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 9db4581d0d79..398c982625f8 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -281,7 +281,7 @@ int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
         }
         write_unlock_bh(&ipv6_sk_mc_lock);
 
-        return -ENOENT;
+        return -EADDRNOTAVAIL;
 }
 
 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
@@ -492,6 +492,7 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
         struct inet6_dev *idev;
         struct ipv6_pinfo *inet6 = inet6_sk(sk);
         struct ip6_sf_socklist *newpsl, *psl;
+        int leavegroup = 0;
         int i, err;
 
         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
@@ -508,6 +509,11 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
                 return -ENODEV;
         dev = idev->dev;
 
+        if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
+                leavegroup = 1;
+                goto done;
+        }
+
         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
                 if (pmc->ifindex != gsf->gf_interface)
                         continue;
@@ -554,6 +560,8 @@ done:
         read_unlock_bh(&idev->lock);
         in6_dev_put(idev);
         dev_put(dev);
+        if (leavegroup)
+                err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
         return err;
 }