sctp: Enable sctp in all network namespaces

- Fix the sctp_af operations to work in all namespaces
- Enable sctp socket creation in all network namespaces.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index bbf1534..a18cda6 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -582,7 +582,7 @@
 	if (!(type & IPV6_ADDR_UNICAST))
 		return 0;
 
-	return ipv6_chk_addr(&init_net, in6, NULL, 0);
+	return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
 }
 
 /* This function checks if the address is a valid address to be used for
@@ -859,14 +859,14 @@
 		struct net_device *dev;
 
 		if (type & IPV6_ADDR_LINKLOCAL) {
+			struct net *net;
 			if (!addr->v6.sin6_scope_id)
 				return 0;
+			net = sock_net(&opt->inet.sk);
 			rcu_read_lock();
-			dev = dev_get_by_index_rcu(&init_net,
-						   addr->v6.sin6_scope_id);
+			dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
 			if (!dev ||
-			    !ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
-					   dev, 0)) {
+			    !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
 				rcu_read_unlock();
 				return 0;
 			}
@@ -899,7 +899,7 @@
 			if (!addr->v6.sin6_scope_id)
 				return 0;
 			rcu_read_lock();
-			dev = dev_get_by_index_rcu(&init_net,
+			dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
 						   addr->v6.sin6_scope_id);
 			rcu_read_unlock();
 			if (!dev)