netdev - [PATCH 5/6] netlink: Create kernel netlink sockets in the proper network namespace

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Date:	Fri, 08 May 2015 21:11:33 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	davem@...emloft.net
Cc:	Ying Xue <ying.xue@...driver.com>, netdev@...r.kernel.org,
	cwang@...pensource.com, xemul@...nvz.org, eric.dumazet@...il.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,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 5/6] netlink: Create kernel netlink sockets in the proper network namespace


Utilize the new functionality of sk_alloc so that nothing needs to be
done to suprress the reference counting on kernel sockets.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 net/netlink/af_netlink.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index d0a82b412b24..5e3883bad65a 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2473,16 +2473,11 @@ __netlink_kernel_create(struct net *net, int unit, struct module *module,
 
 	if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock))
 		return NULL;
-	/*
-	 * We have to just have a reference on the net from sk, but don't
-	 * get_net it. Besides, we cannot get and then put the net here.
-	 * So we create one inside init_net and the move it to net.
-	 */
-	if (__netlink_create(&init_net, sock, cb_mutex, unit, 0) < 0)
+
+	if (__netlink_create(net, sock, cb_mutex, unit, 1) < 0)
 		goto out_sock_release_nosk;
 
 	sk = sock->sk;
-	sk_change_net(sk, net);
 
 	if (!cfg || cfg->groups < 32)
 		groups = 32;
@@ -2538,7 +2533,10 @@ EXPORT_SYMBOL(__netlink_kernel_create);
 void
 netlink_kernel_release(struct sock *sk)
 {
-	sk_release_kernel(sk);
+	if (sk == NULL || sk->sk_socket == NULL)
+		return;
+
+	sock_release(sk->sk_socket);
 }
 EXPORT_SYMBOL(netlink_kernel_release);
 
-- 
2.2.1

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