| Message ID | c805a77e-f21d-754c-79fe-12be45262888@brocade.com |
|---|---|
| State | Changes Requested, archived |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 47f837a..3c69e56 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -3562,6 +3562,8 @@ restart: if (state != INET6_IFADDR_STATE_DEAD) { __ipv6_ifa_notify(RTM_DELADDR, ifa); inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); + } else if (idev->cnf.forwarding) { + addrconf_leave_anycast(ifa); } write_lock_bh(&idev->lock);
Default kernel behavior is to delete IPv6 addresses on link down, which entails deletion of the address-derived subnet-router anycast address. The latter does not happen with sysctl setting to keep global IPv6 addrs on link down, so every link down/up causes an increment of the anycast refcount, cf aca_users in __ipv6_dev_ac_inc(). This bogus refcount stops the anycast being removed on subsequent calls to delete the address. The solution is to leave the group for this subnet anycast on link down also for the callflow when global IPv6 addresses are kept. Fixes: f1705ec197e7 ("net: ipv6: Make address flushing on ifdown optional") Signed-off-by: Mike Manning <mmanning@brocade.com> --- net/ipv6/addrconf.c | 2 ++ 1 file changed, 2 insertions(+)