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authorJulian Anastasov <ja@ssi.bg>2017-02-06 23:14:15 +0200
committerDavid S. Miller <davem@davemloft.net>2017-02-07 13:07:46 -0500
commit63fca65d08632fbec9d9b655f671cf08aa1aeeb8 (patch)
tree103ac18cddcdf911a8589f52fbcefb7140411a51 /net/ipv4
parentc3a2e8370534f810cac6050169db0ed3e0f94f0b (diff)
downloadlinux-63fca65d08632fbec9d9b655f671cf08aa1aeeb8.tar.gz
linux-63fca65d08632fbec9d9b655f671cf08aa1aeeb8.tar.xz
net: add confirm_neigh method to dst_ops
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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/route.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 4b7c231c1aef..cb494a5050f7 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -154,6 +154,7 @@ static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old)
static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr);
+static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr);
static struct dst_ops ipv4_dst_ops = {
.family = AF_INET,
@@ -168,6 +169,7 @@ static struct dst_ops ipv4_dst_ops = {
.redirect = ip_do_redirect,
.local_out = __ip_local_out,
.neigh_lookup = ipv4_neigh_lookup,
+ .confirm_neigh = ipv4_confirm_neigh,
};
#define ECN_OR_COST(class) TC_PRIO_##class
@@ -461,6 +463,23 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
return neigh_create(&arp_tbl, pkey, dev);
}
+static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr)
+{
+ struct net_device *dev = dst->dev;
+ const __be32 *pkey = daddr;
+ const struct rtable *rt;
+
+ rt = (const struct rtable *)dst;
+ if (rt->rt_gateway)
+ pkey = (const __be32 *)&rt->rt_gateway;
+ else if (!daddr ||
+ (rt->rt_flags &
+ (RTCF_MULTICAST | RTCF_BROADCAST | RTCF_LOCAL)))
+ return;
+
+ __ipv4_confirm_neigh(dev, *(__force u32 *)pkey);
+}
+
#define IP_IDENTS_SZ 2048u
static atomic_t *ip_idents __read_mostly;