[NET]: Make netlink_kernel_release publically available as sk_release_kernel.

This staff will be needed for non-netlink kernel sockets, which should
also not pin a namespace like tcp_socket and icmp_socket.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
index fd9876087651..39112e75411c 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -850,6 +850,7 @@ extern struct sock		*sk_alloc(struct net *net, int family,
                                           gfp_t priority,
                                           struct proto *prot);
 extern void                     sk_free(struct sock *sk);
+extern void                     sk_release_kernel(struct sock *sk);
 extern struct sock              *sk_clone(const struct sock *sk,
                                           const gfp_t priority);
 
@@ -1333,6 +1334,18 @@ static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_e
 }
 #endif
 
+/*
+ * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace.
+ * They should not hold a referrence to a namespace in order to allow
+ * to stop it.
+ * Sockets after sk_change_net should be released using sk_release_kernel
+ */
+static inline void sk_change_net(struct sock *sk, struct net *net)
+{
+        put_net(sk->sk_net);
+        sk->sk_net = net;
+}
+
 extern void sock_enable_timestamp(struct sock *sk);
 extern int sock_get_timestamp(struct sock *, struct timeval __user *);
 extern int sock_get_timestampns(struct sock *, struct timespec __user *);