[NET]: Add a network namespace parameter to struct sock

Sockets need to get a reference to their network namespace,
or possibly a simple hold if someone registers on the network
namespace notifier and will free the sockets when the namespace
is going to be destroyed.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
index 5ed9fa42b6e8..9ef8b5fb7936 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -105,6 +105,7 @@ struct proto;
  *      @skc_refcnt: reference count
  *      @skc_hash: hash value used with various protocol lookup tables
  *      @skc_prot: protocol handlers inside a network family
+ *      @skc_net: reference to the network namespace of this socket
  *
  *      This is the minimal network layer representation of sockets, the header
  *      for struct sock and struct inet_timewait_sock.
@@ -119,6 +120,7 @@ struct sock_common {
         atomic_t                skc_refcnt;
         unsigned int            skc_hash;
         struct proto            *skc_prot;
+        struct net              *skc_net;
 };
 
 /**
@@ -195,6 +197,7 @@ struct sock {
 #define sk_refcnt               __sk_common.skc_refcnt
 #define sk_hash                 __sk_common.skc_hash
 #define sk_prot                 __sk_common.skc_prot
+#define sk_net                  __sk_common.skc_net
         unsigned char           sk_shutdown : 2,
                                 sk_no_check : 2,
                                 sk_userlocks : 4;