# \[PATCH net-next\] net: ipv6: lower ndisc notifier priority below addrconf

- From: David Ahern \<hidden\>
- Date: 2017-08-08 21:51:08 
- List: netdev
- Page: https://ratatoskr.run/netdev/2017/08/11061982
- Thread: https://ratatoskr.run/netdev/2017/08/11061982/t.md

```text
ndisc_notify is used to send unsolicited neighbor advertisements
(e.g., on a link up). Currently, the ndisc notifier is run before the
addrconf notifer which means NA's are not sent for link-local addresses
which are added by the addrconf notifier.

Fix by lowering the priority of the ndisc notifier. Setting the priority
to ADDRCONF_NOTIFY_PRIORITY - 5 means it runs after addrconf and before
the route notifier which is ADDRCONF_NOTIFY_PRIORITY - 10.

Signed-off-by: David Ahern <redacted>
---
 net/ipv6/ndisc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 0327c1f2e6fc..5e338eb89509 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1779,6 +1779,7 @@ static int ndisc_netdev_event(struct notifier_block *this, unsigned long event,
 
 static struct notifier_block ndisc_netdev_notifier = {
 	.notifier_call = ndisc_netdev_event,
+	.priority = ADDRCONF_NOTIFY_PRIORITY - 5,
 };
 
 #ifdef CONFIG_SYSCTL
-- 
2.9.3
```