[RAW]: Introduce raw_hashinfo structure

The ipv4/raw.c and ipv6/raw.c contain many common code (most
of which is proc interface) which can be consolidated.

Most of the places to consolidate deal with the raw sockets
hashtable, so introduce a struct raw_hashinfo which describes
the raw sockets hash.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/raw.h

diff --git a/include/net/raw.h b/include/net/raw.h
index 7fc3c77..70b27c7c 100644
--- a/include/net/raw.h
+++ b/include/net/raw.h
@@ -27,6 +27,13 @@
 
 extern int 	raw_rcv(struct sock *, struct sk_buff *);
 
+#define RAW_HTABLE_SIZE	MAX_INET_PROTOS
+
+struct raw_hashinfo {
+	rwlock_t lock;
+	struct hlist_head ht[RAW_HTABLE_SIZE];
+};
+
 #ifdef CONFIG_PROC_FS
 extern int  raw_proc_init(void);
 extern void raw_proc_exit(void);