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authorDavid Miller <davem@davemloft.net>2011-07-11 22:44:24 +0000
committerDavid S. Miller <davem@davemloft.net>2011-07-13 01:12:28 -0700
commit3769cffb1c48f64640ffab7ce3bffe867342c0f0 (patch)
tree8f6fcf2d822bf3a170a534e8540faa34fe9258ef /net/ipv4/route.c
parente5b1de1f5ebe0200e988e195fefb6c7396de6e20 (diff)
ipv4: Inline neigh binding.
Get rid of all of the useless and costly indirection by doing the neigh hash table lookup directly inside of the neighbour binding. Rename from arp_bind_neighbour to rt_bind_neighbour. Use new helpers {__,}ipv4_neigh_lookup() In rt_bind_neighbour() get rid of useless tests which are never true in the context this function is called, namely dev is never NULL and the dst->neighbour is always NULL. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/route.c')
-rw-r--r--net/ipv4/route.c30
1 files changed, 27 insertions, 3 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a8ccd9bca09c..c6388e825ed3 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -108,6 +108,7 @@
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
+#include <net/atmclip.h>
#define RT_FL_TOS(oldflp4) \
((u32)(oldflp4->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)))
@@ -1006,6 +1007,29 @@ static int slow_chain_length(const struct rtable *head)
return length >> FRACT_BITS;
}
+static int rt_bind_neighbour(struct rtable *rt)
+{
+ static const __be32 inaddr_any = 0;
+ struct net_device *dev = rt->dst.dev;
+ struct neigh_table *tbl = &arp_tbl;
+ const __be32 *nexthop;
+ struct neighbour *n;
+
+#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
+ if (dev->type == ARPHRD_ATM)
+ tbl = clip_tbl_hook;
+#endif
+ nexthop = &rt->rt_gateway;
+ if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
+ nexthop = &inaddr_any;
+ n = ipv4_neigh_lookup(tbl, dev, nexthop);
+ if (IS_ERR(n))
+ return PTR_ERR(n);
+ rt->dst.neighbour = n;
+
+ return 0;
+}
+
static struct rtable *rt_intern_hash(unsigned hash, struct rtable *rt,
struct sk_buff *skb, int ifindex)
{
@@ -1042,7 +1066,7 @@ restart:
rt->dst.flags |= DST_NOCACHE;
if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) {
- int err = arp_bind_neighbour(&rt->dst);
+ int err = rt_bind_neighbour(rt);
if (err) {
if (net_ratelimit())
printk(KERN_WARNING
@@ -1138,7 +1162,7 @@ restart:
route or unicast forwarding path.
*/
if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) {
- int err = arp_bind_neighbour(&rt->dst);
+ int err = rt_bind_neighbour(rt);
if (err) {
spin_unlock_bh(rt_hash_lock_addr(hash));
@@ -1599,7 +1623,7 @@ static int check_peer_redir(struct dst_entry *dst, struct inet_peer *peer)
rt->dst.neighbour = NULL;
rt->rt_gateway = peer->redirect_learned.a4;
- if (arp_bind_neighbour(&rt->dst) ||
+ if (rt_bind_neighbour(rt) ||
!(rt->dst.neighbour->nud_state & NUD_VALID)) {
if (rt->dst.neighbour)
neigh_event_send(rt->dst.neighbour, NULL);