@@ -25,5 +25,6 @@ extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
const unsigned char *src_hw,
const unsigned char *target_hw);
extern void arp_xmit(struct sk_buff *skb);
+int arp_invalidate(struct net_device *dev, __be32 ip);
#endif /* _ARP_H */
@@ -1142,6 +1142,23 @@ static int arp_req_get(struct arpreq *r, struct net_device *dev)
return err;
}
+int arp_invalidate(struct net_device *dev, __be32 ip)
+{
+ int err = -ENXIO;
+ struct neighbour *neigh = neigh_lookup(&arp_tbl, &ip, dev);
+
+ if (neigh) {
+ if (neigh->nud_state & ~NUD_NOARP)
+ err = neigh_update(neigh, NULL, NUD_FAILED,
+ NEIGH_UPDATE_F_OVERRIDE|
+ NEIGH_UPDATE_F_ADMIN);
+ neigh_release(neigh);
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(arp_invalidate);
+
static int arp_req_delete_public(struct net *net, struct arpreq *r,
struct net_device *dev)
{
@@ -1162,7 +1179,6 @@ static int arp_req_delete(struct net *net, struct arpreq *r,
{
int err;
__be32 ip;
- struct neighbour *neigh;
if (r->arp_flags & ATF_PUBL)
return arp_req_delete_public(net, r, dev);
@@ -1180,16 +1196,7 @@ static int arp_req_delete(struct net *net, struct arpreq *r,
if (!dev)
return -EINVAL;
}
- err = -ENXIO;
- neigh = neigh_lookup(&arp_tbl, &ip, dev);
- if (neigh) {
- if (neigh->nud_state & ~NUD_NOARP)
- err = neigh_update(neigh, NULL, NUD_FAILED,
- NEIGH_UPDATE_F_OVERRIDE|
- NEIGH_UPDATE_F_ADMIN);
- neigh_release(neigh);
- }
- return err;
+ return arp_invalidate(dev, ip);
}
/*
IPv4 over firewire needs to be able to remove ARP entries from cache that belong to nodes that are removed, because IPv4 over firewire uses ARP packets for private information about nodes. This information becames invalid on node removal, thus as soon as it is connected again, ARP packet should be sent to it which is not done due to valid cache entry. CC: netdev@vger.kernel.org Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com> --- include/net/arp.h | 1 + net/ipv4/arp.c | 29 ++++++++++++++++++----------- 2 files changed, 19 insertions(+), 11 deletions(-)