[IPV4]: Add 'rtable' field in struct sk_buff to alias 'dst' and avoid casts

(Anonymous) unions can help us to avoid ugly casts.

A common cast it the (struct rtable *)skb->dst one.

Defining an union like  :
union {
     struct dst_entry *dst;
     struct rtable *rtable;
};
permits to use skb->rtable in place.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 69e80bd9774a..efe01df8fc0e 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -475,7 +475,7 @@ int arp_find(unsigned char *haddr, struct sk_buff *skb)
                 return 1;
         }
 
-        paddr = ((struct rtable*)skb->dst)->rt_gateway;
+        paddr = skb->rtable->rt_gateway;
 
         if (arp_set_predefined(inet_addr_type(&init_net, paddr), haddr, paddr, dev))
                 return 0;
@@ -814,7 +814,7 @@ static int arp_process(struct sk_buff *skb)
         if (arp->ar_op == htons(ARPOP_REQUEST) &&
             ip_route_input(skb, tip, sip, 0, dev) == 0) {
 
-                rt = (struct rtable*)skb->dst;
+                rt = skb->rtable;
                 addr_type = rt->rt_type;
 
                 if (addr_type == RTN_LOCAL) {