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net: Checks skb_dst to be NULL in inet_iif 

In inet_iif check if skb_rtable is NULL for the skb and return
skb->skb_iif if it is.

This change allows inet_iif to be called before the dst
information has been set in the skb (e.g. when doing socket based
UDP GRO).

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2016-04-05 08:22:49 -07:00 committed by David S. Miller
parent 1fbbe1a8a9
commit 0340d0b9e0
1 changed files with 4 additions and 3 deletions
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7
include/net/route.h
View File

@ -322,10 +322,11 @@ static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable
static inline int inet_iif(const struct sk_buff *skb)
{
int iif = skb_rtable(skb)->rt_iif;
struct rtable *rt = skb_rtable(skb);
if (rt && rt->rt_iif)
return rt->rt_iif;
if (iif)
return iif;
return skb->skb_iif;
}