[ICSK]: Introduce inet_csk_ctl_sock_create

Consolidating open coded sequences in tcp and dccp, v4 and v6.
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_connection_sock.h

@@ -321,4 +321,8 @@ extern void inet_csk_listen_stop(struct sock *sk);
 
 extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
 
+extern int inet_csk_ctl_sock_create(struct socket **sock,
+				    unsigned short family,
+				    unsigned short type,
+				    unsigned char protocol);
 #endif /* _INET_CONNECTION_SOCK_H */

net/dccp/ipv4.c

@@ -1099,29 +1099,6 @@ static struct inet_protosw dccp_v4_protosw = {
 	.flags		= INET_PROTOSW_ICSK,
 };
 
-static char dccp_v4_ctl_socket_err_msg[] __initdata =
-	KERN_ERR "DCCP: Failed to create the control socket.\n";
-
-static int __init dccp_v4_ctl_sock_init(void)
-{
-	int rc = sock_create_kern(PF_INET, SOCK_DCCP, IPPROTO_DCCP,
-				  &dccp_v4_ctl_socket);
-	if (rc < 0)
-		printk(dccp_v4_ctl_socket_err_msg);
-	else {
-		dccp_v4_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
-		inet_sk(dccp_v4_ctl_socket->sk)->uc_ttl = -1;
-
-		/* Unhash it so that IP input processing does not even
-		 * see it, we do not wish this socket to see incoming
-		 * packets.
-		 */
-		dccp_v4_ctl_socket->sk->sk_prot->unhash(dccp_v4_ctl_socket->sk);
-	}
-
-	return rc;
-}
-
 static int __init dccp_v4_init(void)
 {
 	int err = proto_register(&dccp_v4_prot, 1);
@@ -1135,7 +1112,8 @@ static int __init dccp_v4_init(void)
 
 	inet_register_protosw(&dccp_v4_protosw);
 
-	err = dccp_v4_ctl_sock_init();
+	err = inet_csk_ctl_sock_create(&dccp_v4_ctl_socket, PF_INET,
+				       SOCK_DCCP, IPPROTO_DCCP);
 	if (err)
 		goto out_unregister_protosw;
 out:

net/dccp/ipv6.c

@@ -1229,29 +1229,6 @@ static struct inet_protosw dccp_v6_protosw = {
 	.flags		= INET_PROTOSW_ICSK,
 };
 
-static char dccp_v6_ctl_socket_err_msg[] __initdata =
-	KERN_ERR "DCCP: Failed to create the control socket.\n";
-
-static int __init dccp_v6_ctl_sock_init(void)
-{
-	int rc = sock_create_kern(PF_INET6, SOCK_DCCP, IPPROTO_DCCP,
-				  &dccp_v6_ctl_socket);
-	if (rc < 0)
-		printk(dccp_v6_ctl_socket_err_msg);
-	else {
-		dccp_v6_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
-		inet_sk(dccp_v6_ctl_socket->sk)->uc_ttl = -1;
-
-		/* Unhash it so that IP input processing does not even
-		 * see it, we do not wish this socket to see incoming
-		 * packets.
-		 */
-		dccp_v6_ctl_socket->sk->sk_prot->unhash(dccp_v6_ctl_socket->sk);
-	}
-
-	return rc;
-}
-
 static int __init dccp_v6_init(void)
 {
 	int err = proto_register(&dccp_v6_prot, 1);
@@ -1265,7 +1242,9 @@ static int __init dccp_v6_init(void)
 
 	inet6_register_protosw(&dccp_v6_protosw);
 
-	if (dccp_v6_ctl_sock_init() != 0)
+	err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
+				       SOCK_DCCP, IPPROTO_DCCP);
+	if (err != 0)
 		goto out_unregister_protosw;
 out:
 	return err;

net/ipv4/inet_connection_sock.c

@@ -648,3 +648,22 @@ void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
 }
 
 EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr);
+
+int inet_csk_ctl_sock_create(struct socket **sock, unsigned short family,
+			     unsigned short type, unsigned char protocol)
+{
+	int rc = sock_create_kern(family, type, protocol, sock);
+
+	if (rc == 0) {
+		(*sock)->sk->sk_allocation = GFP_ATOMIC;
+		inet_sk((*sock)->sk)->uc_ttl = -1;
+		/*
+		 * Unhash it so that IP input processing does not even see it,
+		 * we do not wish this socket to see incoming packets.
+		 */
+		(*sock)->sk->sk_prot->unhash((*sock)->sk);
+	}
+	return rc;
+}
+
+EXPORT_SYMBOL_GPL(inet_csk_ctl_sock_create);

net/ipv4/tcp_ipv4.c

@@ -1828,21 +1828,10 @@ struct proto tcp_prot = {
 	.rsk_prot		= &tcp_request_sock_ops,
 };
 
-
-
 void __init tcp_v4_init(struct net_proto_family *ops)
 {
-	int err = sock_create_kern(PF_INET, SOCK_RAW, IPPROTO_TCP, &tcp_socket);
-	if (err < 0)
+	if (inet_csk_ctl_sock_create(&tcp_socket, PF_INET, SOCK_RAW, IPPROTO_TCP) < 0)
 		panic("Failed to create the TCP control socket.\n");
-	tcp_socket->sk->sk_allocation   = GFP_ATOMIC;
-	inet_sk(tcp_socket->sk)->uc_ttl = -1;
-
-	/* Unhash it so that IP input processing does not even
-	 * see it, we do not wish this socket to see incoming
-	 * packets.
-	 */
-	tcp_socket->sk->sk_prot->unhash(tcp_socket->sk);
 }
 
 EXPORT_SYMBOL(ipv4_specific);

net/ipv6/tcp_ipv6.c

@@ -1605,21 +1605,12 @@ static struct inet_protosw tcpv6_protosw = {
 
 void __init tcpv6_init(void)
 {
-	int err;
-
 	/* register inet6 protocol */
 	if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0)
 		printk(KERN_ERR "tcpv6_init: Could not register protocol\n");
 	inet6_register_protosw(&tcpv6_protosw);
 
-	err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_TCP, &tcp6_socket);
-	if (err < 0)
+	if (inet_csk_ctl_sock_create(&tcp6_socket, PF_INET6, SOCK_RAW,
+				     IPPROTO_TCP) < 0)
 		panic("Failed to create the TCPv6 control socket.\n");
-	tcp6_socket->sk->sk_allocation = GFP_ATOMIC;
-
-	/* Unhash it so that IP input processing does not even
-	 * see it, we do not wish this socket to see incoming
-	 * packets.
-	 */
-	tcp6_socket->sk->sk_prot->unhash(tcp6_socket->sk);
 }