netdev - [RFC PATCH net-next 05/11] udp_tunnel: avoid to switch namespace for tunnel socket

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Date:	Thu, 7 May 2015 16:52:44 +0800
From:	Ying Xue <ying.xue@...driver.com>
To:	<netdev@...r.kernel.org>
CC:	<cwang@...pensource.com>, <herbert@...dor.apana.org.au>,
	<xemul@...nvz.org>, <davem@...emloft.net>,
	<eric.dumazet@...il.com>, <ebiederm@...ssion.com>,
	<maxk@....qualcomm.com>, <stephen@...workplumber.org>,
	<tgraf@...g.ch>, <nicolas.dichtel@...nd.com>,
	<tom@...bertland.com>, <jchapman@...alix.com>,
	<erik.hugne@...csson.com>, <jon.maloy@...csson.com>,
	<horms@...ge.net.au>
Subject: [RFC PATCH net-next 05/11] udp_tunnel: avoid to switch namespace for tunnel socket

There is no the race between put_net() and kernel socket creation, so
it's unnecessary to switch namespace for a kernel tunnel socket from
init_net to its desirable one.

Signed-off-by: Ying Xue <ying.xue@...driver.com>
---
 net/ipv4/udp_tunnel.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/udp_tunnel.c b/net/ipv4/udp_tunnel.c
index 6bb98cc..720ab82 100644
--- a/net/ipv4/udp_tunnel.c
+++ b/net/ipv4/udp_tunnel.c
@@ -15,11 +15,11 @@ int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
 	struct socket *sock = NULL;
 	struct sockaddr_in udp_addr;
 
-	err = sock_create_kern(AF_INET, SOCK_DGRAM, 0, &sock);
+	err = __sock_create(net, AF_INET, SOCK_DGRAM, 0, &sock, 1);
 	if (err < 0)
 		goto error;
 
-	sk_change_net(sock->sk, net);
+	put_net(sock_net(sock->sk));
 
 	udp_addr.sin_family = AF_INET;
 	udp_addr.sin_addr = cfg->local_ip;
@@ -47,7 +47,8 @@ int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
 error:
 	if (sock) {
 		kernel_sock_shutdown(sock, SHUT_RDWR);
-		sk_release_kernel(sock->sk);
+		get_net(sock_net(sock->sk));
+		sock_release(sock);
 	}
 	*sockp = NULL;
 	return err;
@@ -101,7 +102,8 @@ void udp_tunnel_sock_release(struct socket *sock)
 {
 	rcu_assign_sk_user_data(sock->sk, NULL);
 	kernel_sock_shutdown(sock, SHUT_RDWR);
-	sk_release_kernel(sock->sk);
+	get_net(sock_net(sock->sk));
+	sock_release(sock);
 }
 EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
 
-- 
1.7.9.5

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