[IPV4]: ip_route_input() annotations

ip_route_input() takes net-endian source and destination address.
* Annotated as such.
* arguments of its invocations annotated where needed.
* local helpers getting the same values passed to by it (ip_route_input_mc(),
ip_route_input_slow(), ip_handle_martian_source(), ip_mkroute_input(),
ip_mkroute_input_def(), __mkroute_input()) annotated

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index c8a3723..48e1ccb 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -710,7 +710,7 @@
 	unsigned char *arp_ptr;
 	struct rtable *rt;
 	unsigned char *sha, *tha;
-	u32 sip, tip;
+	__be32 sip, tip;
 	u16 dev_type = dev->type;
 	int addr_type;
 	struct neighbour *n;