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ipv4: Pull redirect instantiation out into a helper function. 

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-11 20:27:54 -07:00
parent d3351b75a7
commit d0da720f9f
1 changed files with 22 additions and 15 deletions
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37
net/ipv4/route.c
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@ -1271,6 +1271,26 @@ static void rt_del(unsigned int hash, struct rtable *rt)
spin_unlock_bh(rt_hash_lock_addr(hash));
}
static void ip_do_redirect(struct rtable *rt, __be32 old_gw, __be32 new_gw)
{
struct neighbour *n;
if (rt->rt_gateway != old_gw)
return;
n = ipv4_neigh_lookup(&rt->dst, NULL, &new_gw);
if (n) {
if (!(n->nud_state & NUD_VALID)) {
neigh_event_send(n, NULL);
} else {
rt->rt_gateway = new_gw;
rt->rt_flags |= RTCF_REDIRECTED;
call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n);
}
neigh_release(n);
}
}
/* called in rcu_read_lock() section */
void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
__be32 saddr, struct net_device *dev)
@ -1311,8 +1331,6 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
rthp = &rt_hash_table[hash].chain;
while ((rt = rcu_dereference(*rthp)) != NULL) {
struct neighbour *n;
rthp = &rt->dst.rt_next;
if (rt->rt_key_dst != daddr ||
@ -1322,21 +1340,10 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
rt_is_expired(rt) ||
!net_eq(dev_net(rt->dst.dev), net) ||
rt->dst.error ||
rt->dst.dev != dev ||
rt->rt_gateway != old_gw)
rt->dst.dev != dev)
continue;
n = ipv4_neigh_lookup(&rt->dst, NULL, &new_gw);
if (n) {
if (!(n->nud_state & NUD_VALID)) {
neigh_event_send(n, NULL);
} else {
rt->rt_gateway = new_gw;
rt->rt_flags |= RTCF_REDIRECTED;
call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n);
}
neigh_release(n);
}
ip_do_redirect(rt, old_gw, new_gw);
}
}
}