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net: add confirm_neigh method to dst_ops

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Add confirm_neigh method to dst_ops and use it from IPv4 and IPv6
to lookup and confirm the neighbour. Its usage via the new helper
dst_confirm_neigh() should be restricted to MSG_PROBE users for
performance reasons.

For XFRM prefer the last tunnel address, if present. With help
from Steffen Klassert.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Anastasov 2017-02-06 23:14:15 +02:00 • committed by David S. Miller
parent c3a2e83705
commit 63fca65d08
7 changed files with 96 additions and 0 deletions
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16
net/ipv6/route.c
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@ -223,6 +223,21 @@ static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
return neigh_create(&nd_tbl, daddr, dst->dev);
}
static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
{
struct net_device *dev = dst->dev;
struct rt6_info *rt = (struct rt6_info *)dst;
daddr = choose_neigh_daddr(rt, NULL, daddr);
if (!daddr)
return;
if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
return;
if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
return;
__ipv6_confirm_neigh(dev, daddr);
}
static struct dst_ops ip6_dst_ops_template = {
.family = AF_INET6,
.gc = ip6_dst_gc,
@ -239,6 +254,7 @@ static struct dst_ops ip6_dst_ops_template = {
.redirect = rt6_do_redirect,
.local_out = __ip6_local_out,
.neigh_lookup = ip6_neigh_lookup,
.confirm_neigh = ip6_confirm_neigh,
};
static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)