[NET]: Fix IP_ADD/DROP_MEMBERSHIP to handle only connectionless

Fix IP[V6]_ADD_MEMBERSHIP and IP[V6]_DROP_MEMBERSHIP to
return -EPROTO for connection oriented sockets.

Signed-off-by: Flavio Leitner <fleitner@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 4d544573f48a..6b420aedcdcf 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -625,6 +625,10 @@ static int do_ip_setsockopt(struct sock *sk, int level,
         {
                 struct ip_mreqn mreq;
 
+                err = -EPROTO;
+                if (inet_sk(sk)->is_icsk)
+                        break;
+
                 if (optlen < sizeof(struct ip_mreq))
                         goto e_inval;
                 err = -EFAULT;