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ipv4: some rt_iif -> rt_route_iif conversions 

As rt_iif represents input device even for packets
coming from loopback with output route, it is not an unique
key specific to input routes. Now rt_route_iif has such role,
it was fl.iif in 2.6.38, so better to change the checks at
some places to save CPU cycles and to restore 2.6.38 semantics.

compare_keys:
	- input routes: only rt_route_iif matters, rt_iif is same
	- output routes: only rt_oif matters, rt_iif is not
		used for matching in __ip_route_output_key
	- now we are back to 2.6.38 state

ip_route_input_common:
	- matching rt_route_iif implies input route
	- compared to 2.6.38 we eliminated one rth->fl.oif check
	because it was not needed even for 2.6.38

compare_hash_inputs:
	Only the change here is not an optimization, it has
	effect only for output routes. I assume I'm restoring
	the original intention to ignore oif, it was using fl.iif
	- now we are back to 2.6.38 state

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Anastasov 2011-08-09 04:01:16 +00:00 committed by David S. Miller
parent 5189054dd7
commit 97a8041020
1 changed files with 3 additions and 5 deletions
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8
net/ipv4/route.c
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@ -722,7 +722,7 @@ static inline bool compare_hash_inputs(const struct rtable *rt1,
{
return ((((__force u32)rt1->rt_key_dst ^ (__force u32)rt2->rt_key_dst) |
((__force u32)rt1->rt_key_src ^ (__force u32)rt2->rt_key_src) |
(rt1->rt_iif ^ rt2->rt_iif)) == 0);
(rt1->rt_route_iif ^ rt2->rt_route_iif)) == 0);
}
static inline int compare_keys(struct rtable *rt1, struct rtable *rt2)
@ -732,8 +732,7 @@ static inline int compare_keys(struct rtable *rt1, struct rtable *rt2)
(rt1->rt_mark ^ rt2->rt_mark) |
(rt1->rt_key_tos ^ rt2->rt_key_tos) |
(rt1->rt_route_iif ^ rt2->rt_route_iif) |
(rt1->rt_oif ^ rt2->rt_oif) |
(rt1->rt_iif ^ rt2->rt_iif)) == 0;
(rt1->rt_oif ^ rt2->rt_oif)) == 0;
}
static inline int compare_netns(struct rtable *rt1, struct rtable *rt2)
@ -2321,9 +2320,8 @@ int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr,
rth = rcu_dereference(rth->dst.rt_next)) {
if ((((__force u32)rth->rt_key_dst ^ (__force u32)daddr) |
((__force u32)rth->rt_key_src ^ (__force u32)saddr) |
(rth->rt_iif ^ iif) |
(rth->rt_route_iif ^ iif) |
(rth->rt_key_tos ^ tos)) == 0 &&
rt_is_input_route(rth) &&
rth->rt_mark == skb->mark &&
net_eq(dev_net(rth->dst.dev), net) &&
!rt_is_expired(rth)) {