[NET]: Make socket creation namespace safe.

This patch passes in the namespace a new socket should be created in
and has the socket code do the appropriate reference counting.  By
virtue of this all socket create methods are touched.  In addition
the socket create methods are modified so that they will fail if
you attempt to create a socket in a non-default network namespace.

Failing if we attempt to create a socket outside of the default
network namespace ensures that as we incrementally make the network stack
network namespace aware we will not export functionality that someone
has not audited and made certain is network namespace safe.
Allowing us to partially enable network namespaces before all of the
exotic protocols are supported.

Any protocol layers I have missed will fail to compile because I now
pass an extra parameter into the socket creation code.

[ Integrated AF_IUCV build fixes from Andrew Morton... -DaveM ]

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

2 files changed, 3 insertions, 2 deletions

diff --git a/include/linux/if_pppox.h b/include/linux/if_pppox.h
index 25652545ba6e..43cfc9f0c078 100644
--- a/include/linux/if_pppox.h
+++ b/include/linux/if_pppox.h
@@ -172,7 +172,7 @@ static inline struct sock *sk_pppox(struct pppox_sock *po)
 struct module;
 
 struct pppox_proto {
-        int             (*create)(struct socket *sock);
+        int             (*create)(struct net *net, struct socket *sock);
         int             (*ioctl)(struct socket *sock, unsigned int cmd,
                                  unsigned long arg);
         struct module   *owner;
diff --git a/include/linux/net.h b/include/linux/net.h
index efc45177b503..c136abce7ef6 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -23,6 +23,7 @@
 
 struct poll_table_struct;
 struct inode;
+struct net;
 
 #define NPROTO          34              /* should be enough for now..   */
 
@@ -169,7 +170,7 @@ struct proto_ops {
 
 struct net_proto_family {
         int             family;
-        int             (*create)(struct socket *sock, int protocol);
+        int             (*create)(struct net *net, struct socket *sock, int protocol);
         struct module   *owner;
 };