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ipv4: Make sure flowi4->{saddr,daddr} are always set. 

Slow path output route resolution always makes sure that
->{saddr,daddr} are set, and also if we trigger into IPSEC resolution
we initialize them as well, because xfrm_lookup() expects them to be
fully resolved.

But if we hit the fast path and flowi4->flowi4_proto is zero, we won't
do this initialization.

Therefore, move the IPSEC path initialization to the route cache
lookup fast path to make sure these are always set.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-05-02 14:37:45 -07:00
parent 14ad2513ed
commit 5615787257
1 changed files with 5 additions and 6 deletions
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11
net/ipv4/route.c
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@ -2675,6 +2675,10 @@ struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *flp4)
dst_use(&rth->dst, jiffies);
RT_CACHE_STAT_INC(out_hit);
rcu_read_unlock_bh();
if (!flp4->saddr)
flp4->saddr = rth->rt_src;
if (!flp4->daddr)
flp4->daddr = rth->rt_dst;
return rth;
}
RT_CACHE_STAT_INC(out_hlist_search);
@ -2772,15 +2776,10 @@ struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4,
if (IS_ERR(rt))
return rt;
if (flp4->flowi4_proto) {
if (!flp4->saddr)
flp4->saddr = rt->rt_src;
if (!flp4->daddr)
flp4->daddr = rt->rt_dst;
if (flp4->flowi4_proto)
rt = (struct rtable *) xfrm_lookup(net, &rt->dst,
flowi4_to_flowi(flp4),
sk, 0);
}
return rt;
}