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authorJulian Anastasov <ja@ssi.bg>2017-02-07 00:14:15 +0300
committerDavid S. Miller <davem@davemloft.net>2017-02-07 21:07:46 +0300
commit63fca65d08632fbec9d9b655f671cf08aa1aeeb8 (patch)
tree103ac18cddcdf911a8589f52fbcefb7140411a51 /include/net/arp.h
parentc3a2e8370534f810cac6050169db0ed3e0f94f0b (diff)
downloadlinux-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 'include/net/arp.h')
-rw-r--r--include/net/arp.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/net/arp.h b/include/net/arp.h
index 5e0f891d476c..65619a2de6f4 100644
--- a/include/net/arp.h
+++ b/include/net/arp.h
@@ -35,6 +35,22 @@ static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32
return n;
}
+static inline void __ipv4_confirm_neigh(struct net_device *dev, u32 key)
+{
+ struct neighbour *n;
+
+ rcu_read_lock_bh();
+ n = __ipv4_neigh_lookup_noref(dev, key);
+ if (n) {
+ unsigned long now = jiffies;
+
+ /* avoid dirtying neighbour */
+ if (n->confirmed != now)
+ n->confirmed = now;
+ }
+ rcu_read_unlock_bh();
+}
+
void arp_init(void);
int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
void arp_send(int type, int ptype, __be32 dest_ip,