net: add real socket cookies

A long standing problem in netlink socket dumps is the use
of kernel socket addresses as cookies.

1) It is a security concern.

2) Sockets can be reused quite quickly, so there is
   no guarantee a cookie is used once and identify
   a flow.

3) request sock, establish sock, and timewait socks
   for a given flow have different cookies.

Part of our effort to bring better TCP statistics requires
to switch to a different allocator.

In this patch, I chose to use a per network namespace 64bit generator,
and to use it only in the case a socket needs to be dumped to netlink.
(This might be refined later if needed)

Note that I tried to carry cookies from request sock, to establish sock,
then timewait sockets.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Eric Salo <salo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/inet_connection_sock.c

@@ -678,6 +678,8 @@ struct sock *inet_csk_clone_lock(const struct sock *sk,
 		newsk->sk_write_space = sk_stream_write_space;
 
 		newsk->sk_mark = inet_rsk(req)->ir_mark;
+		atomic64_set(&newsk->sk_cookie,
+			     atomic64_read(&inet_rsk(req)->ir_cookie));
 
 		newicsk->icsk_retransmits = 0;
 		newicsk->icsk_backoff	  = 0;