[PATCH] net: make /proc/net/protocols namespace aware

[Eric Dumazet <dada1@cosmosbay.com>]

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Converting /proc/net/protocols to be namespace aware is quite easy
and permits us to use sock_prot_inuse_get().

This provides seperate counters for each protocol. For example
we can really count TCPv6 sockets and TCPv4 sockets, while previously,
we had the same value, and this value was not namespace aware.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
---
 net/core/sock.c |   27 +++++++++++++++++++++++----
 1 files changed, 23 insertions(+), 4 deletions(-)


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diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index a1eb596..36856ca 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -361,6 +361,7 @@ static void unix_sock_destructor(struct sock *sk)
 		unix_release_addr(u->addr);
 
 	atomic_dec(&unix_nr_socks);
+	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 #ifdef UNIX_REFCNT_DEBUG
 	printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk,
 		atomic_read(&unix_nr_socks));
@@ -612,6 +613,9 @@ static struct sock *unix_create1(struct net *net, struct socket *sock)
 out:
 	if (sk == NULL)
 		atomic_dec(&unix_nr_socks);
+	else
+		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+		
 	return sk;
 }