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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
include/net/arp.h
View File

@@ -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,

7
include/net/dst.h
View File

@@ -477,6 +477,13 @@ static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst
return IS_ERR(n) ? NULL : n;
}
static inline void dst_confirm_neigh(const struct dst_entry *dst,
const void *daddr)
{
if (dst->ops->confirm_neigh)
dst->ops->confirm_neigh(dst, daddr);
}
static inline void dst_link_failure(struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);

2
include/net/dst_ops.h
View File

@@ -33,6 +33,8 @@ struct dst_ops {
struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr);
void (*confirm_neigh)(const struct dst_entry *dst,
const void *daddr);
struct kmem_cache *kmem_cachep;

17
include/net/ndisc.h
View File

@@ -391,6 +391,23 @@ static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, cons
return n;
}
static inline void __ipv6_confirm_neigh(struct net_device *dev,
const void *pkey)
{
struct neighbour *n;
rcu_read_lock_bh();
n = __ipv6_neigh_lookup_noref(dev, pkey);
if (n) {
unsigned long now = jiffies;
/* avoid dirtying neighbour */
if (n->confirmed != now)
n->confirmed = now;
}
rcu_read_unlock_bh();
}
int ndisc_init(void);
int ndisc_late_init(void);