[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, 1 insertions, 1 deletions

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 65631391d479..d36e310b314d 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -351,7 +351,7 @@ static int ip_rcv_finish(struct sk_buff *skb)
         if (iph->ihl > 5 && ip_rcv_options(skb))
                 goto drop;
 
-        rt = (struct rtable*)skb->dst;
+        rt = skb->rtable;
         if (rt->rt_type == RTN_MULTICAST)
                 IP_INC_STATS_BH(IPSTATS_MIB_INMCASTPKTS);
         else if (rt->rt_type == RTN_BROADCAST)