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ipv6: Send unsolicited neighbour advertismements when notified 

The NETDEV_NOTIFY_PEERS notifier is a request to send such
advertisements following migration to a different physical link,
e.g. virtual machine migration.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2011-04-15 13:46:02 +00:00 committed by David S. Miller
parent b3337e4cea
commit f47b94646f
1 changed files with 26 additions and 0 deletions
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26
net/ipv6/ndisc.c
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@ -611,6 +611,29 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
}
static void ndisc_send_unsol_na(struct net_device *dev)
{
struct inet6_dev *idev;
struct inet6_ifaddr *ifa;
struct in6_addr mcaddr;
idev = in6_dev_get(dev);
if (!idev)
return;
read_lock_bh(&idev->lock);
list_for_each_entry(ifa, &idev->addr_list, if_list) {
addrconf_addr_solict_mult(&ifa->addr, &mcaddr);
ndisc_send_na(dev, NULL, &mcaddr, &ifa->addr,
/*router=*/ !!idev->cnf.forwarding,
/*solicited=*/ false, /*override=*/ true,
/*inc_opt=*/ true);
}
read_unlock_bh(&idev->lock);
in6_dev_put(idev);
}
void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
const struct in6_addr *solicit,
const struct in6_addr *daddr, const struct in6_addr *saddr)
@ -1723,6 +1746,9 @@ static int ndisc_netdev_event(struct notifier_block *this, unsigned long event,
neigh_ifdown(&nd_tbl, dev);
fib6_run_gc(~0UL, net);
break;
case NETDEV_NOTIFY_PEERS:
ndisc_send_unsol_na(dev);
break;
default:
break;
}