tree 9d249de8b5e5a688c48ce999a75fda7b9a824e13
parent 7c30013133964aaa2f45c17d6e9782ac6cfd7f5f
author Mike Manning <mmanning@brocade.com> 1504536775 +0100
committer David S. Miller <davem@davemloft.net> 1505864529 -0700

net: ipv6: fix regression of no RTM_DELADDR sent after DAD failure

Commit f784ad3d79e5 ("ipv6: do not send RTM_DELADDR for tentative
addresses") incorrectly assumes that no RTM_NEWADDR are sent for
addresses in tentative state, as this does happen for the standard
IPv6 use-case of DAD failure, see the call to ipv6_ifa_notify() in
addconf_dad_stop(). So as a result of this change, no RTM_DELADDR is
sent after DAD failure for a link-local when strict DAD (accept_dad=2)
is configured, or on the next admin down in other cases. The absence
of this notification breaks backwards compatibility and causes problems
after DAD failure if this notification was being relied on. The
solution is to allow RTM_DELADDR to still be sent after DAD failure.

Fixes: f784ad3d79e5 ("ipv6: do not send RTM_DELADDR for tentative addresses")
Signed-off-by: Mike Manning <mmanning@brocade.com>
Cc: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>