[INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h

To help in reducing the number of include dependencies, several files were
touched as they were getting needed headers indirectly for stuff they use.

Thanks also to Alan Menegotto for pointing out that net/dccp/proto.c had
linux/dccp.h include twice.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 3b5559a..7d2674f 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -251,16 +251,15 @@
 #include <linux/config.h>
 #include <linux/list.h>                 /* for struct list_head */
 #include <linux/spinlock.h>             /* for struct rwlock_t */
-#include <linux/skbuff.h>               /* for struct sk_buff */
-#include <linux/ip.h>                   /* for struct iphdr */
 #include <asm/atomic.h>                 /* for struct atomic_t */
-#include <linux/netdevice.h>		/* for struct neighbour */
-#include <net/dst.h>			/* for struct dst_entry */
-#include <net/udp.h>
 #include <linux/compiler.h>
+#include <linux/timer.h>
 
+#include <net/checksum.h>
 
 #ifdef CONFIG_IP_VS_DEBUG
+#include <linux/net.h>
+
 extern int ip_vs_get_debug_level(void);
 #define IP_VS_DBG(level, msg...)			\
     do {						\
@@ -429,8 +428,11 @@
 	spinlock_t              lock;           /* spin lock */
 };
 
+struct dst_entry;
+struct iphdr;
 struct ip_vs_conn;
 struct ip_vs_app;
+struct sk_buff;
 
 struct ip_vs_protocol {
 	struct ip_vs_protocol	*next;