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net: implements ip_route_input_noref()

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ip_route_input() is the version returning a refcounted dst, while
ip_route_input_noref() returns a non refcounted one.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2010-05-10 11:32:55 +00:00
committed by David S. Miller
parent 7fee226ad2
commit 407eadd996
2 changed files with 26 additions and 6 deletions
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15
net/ipv4/route.c
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@@ -2277,8 +2277,8 @@ martian_source:
goto e_inval;
}
int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
u8 tos, struct net_device *dev)
int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr,
u8 tos, struct net_device *dev, bool noref)
{
struct rtable * rth;
unsigned hash;
@@ -2304,10 +2304,15 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
rth->fl.mark == skb->mark &&
net_eq(dev_net(rth->u.dst.dev), net) &&
!rt_is_expired(rth)) {
dst_use(&rth->u.dst, jiffies);
if (noref) {
dst_use_noref(&rth->u.dst, jiffies);
skb_dst_set_noref(skb, &rth->u.dst);
} else {
dst_use(&rth->u.dst, jiffies);
skb_dst_set(skb, &rth->u.dst);
}
RT_CACHE_STAT_INC(in_hit);
rcu_read_unlock();
skb_dst_set(skb, &rth->u.dst);
return 0;
}
RT_CACHE_STAT_INC(in_hlist_search);
@@ -2350,6 +2355,7 @@ skip_cache:
}
return ip_route_input_slow(skb, daddr, saddr, tos, dev);
}
EXPORT_SYMBOL(ip_route_input_common);
static int __mkroute_output(struct rtable **result,
struct fib_result *res,
@@ -3361,5 +3367,4 @@ void __init ip_static_sysctl_init(void)
#endif
EXPORT_SYMBOL(__ip_select_ident);
EXPORT_SYMBOL(ip_route_input);
EXPORT_SYMBOL(ip_route_output_key);