o ipv4: use revised net module infrastructure

Using sk_set_owner and having THIS_MODULE in the struct proto_ops
registered with the core. The sk_set_owner cases are in the callers
of tp->af_specific->syn_recv_sock so as to not have spurious extra
sk_set_owner calls in the ipv6 code that reuses ipv4 code.

net/ipv4/af_inet.c

@@ -390,6 +390,7 @@ static int inet_create(struct socket *sock, int protocol)
 	inet->id = 0;
 
 	sock_init_data(sock, sk);
+	sk_set_owner(sk, THIS_MODULE);
 
 	sk->destruct = inet_sock_destruct;
 	sk->zapped	= 0;
@@ -882,7 +883,7 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 
 struct proto_ops inet_stream_ops = {
 	.family =	PF_INET,
-
+	.owner =	THIS_MODULE,
 	.release =	inet_release,
 	.bind =		inet_bind,
 	.connect =	inet_stream_connect,
@@ -903,7 +904,7 @@ struct proto_ops inet_stream_ops = {
 
 struct proto_ops inet_dgram_ops = {
 	.family =	PF_INET,
-
+	.owner =	THIS_MODULE,
 	.release =	inet_release,
 	.bind =		inet_bind,
 	.connect =	inet_dgram_connect,

net/ipv4/syncookies.c

@@ -101,9 +101,10 @@ static inline struct sock *get_cookie_sock(struct sock *sk, struct sk_buff *skb,
 	struct sock *child;
 
 	child = tp->af_specific->syn_recv_sock(sk, skb, req, dst);
-	if (child)
+	if (child) {
+		sk_set_owner(child, sk->owner);
 		tcp_acceptq_queue(sk, req, child);
-	else
+	} else
 		tcp_openreq_free(req);
 
 	return child;

net/ipv4/tcp_minisocks.c

@@ -967,6 +967,7 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
 	if (child == NULL)
 		goto listen_overflow;
 
+	sk_set_owner(child, sk->owner);
 	tcp_synq_unlink(tp, req, prev);
 	tcp_synq_removed(sk, req);