ipv4: process socket-level control messages in IPv4

Process socket-level control messages by invoking
__sock_cmsg_send in ip_cmsg_send for control messages on
the SOL_SOCKET layer.

This makes sure whenever ip_cmsg_send is called in udp, icmp,
and raw, we also process socket-level control messages.

Note that this commit interprets new control messages that
were ignored before. As such, this commit does not change
the behavior of IPv4 control messages.

Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 8d22de7..088ce66 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -548,7 +548,7 @@
 	ipc.oif = sk->sk_bound_dev_if;
 
 	if (msg->msg_controllen) {
-		err = ip_cmsg_send(net, msg, &ipc, false);
+		err = ip_cmsg_send(sk, msg, &ipc, false);
 		if (unlikely(err)) {
 			kfree(ipc.opt);
 			goto out;