[NET]: {get|set}sockopt compatibility layer

This patch extends {get|set}sockopt compatibility layer in order to
move protocol specific parts to their place and avoid huge universal
net/compat.c file in the future.

Signed-off-by: Dmitry Mishin <dim@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 4688969..412e52c 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -80,10 +80,14 @@
 	int set_optmin;
 	int set_optmax;
 	int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
+	int (*compat_set)(struct sock *sk, int optval,
+			void __user *user, unsigned int len);
 
 	int get_optmin;
 	int get_optmax;
 	int (*get)(struct sock *sk, int optval, void __user *user, int *len);
+	int (*compat_get)(struct sock *sk, int optval,
+			void __user *user, int *len);
 
 	/* Number of users inside set() or get(). */
 	unsigned int use;
@@ -246,6 +250,11 @@
 int nf_getsockopt(struct sock *sk, int pf, int optval, char __user *opt,
 		  int *len);
 
+int compat_nf_setsockopt(struct sock *sk, int pf, int optval,
+		char __user *opt, int len);
+int compat_nf_getsockopt(struct sock *sk, int pf, int optval,
+		char __user *opt, int *len);
+
 /* Packet queuing */
 struct nf_queue_handler {
 	int (*outfn)(struct sk_buff *skb, struct nf_info *info,