From ea06f7176413e2538d13bb85b65387d0917943d9 Mon Sep 17 00:00:00 2001 From: Mike Manning Date: Fri, 22 Jul 2016 18:32:11 +0100 Subject: net: ipv6: Always leave anycast and multicast groups on link down Default kernel behavior is to delete IPv6 addresses on link down, which entails deletion of the multicast and the subnet-router anycast addresses. These deletions do not happen with sysctl setting to keep global IPv6 addresses on link down, so every link down/up causes an increment of the anycast and multicast refcounts. These bogus refcounts may stop these addrs from being removed on subsequent calls to delete them. The solution is to leave the groups for the multicast and subnet anycast on link down for the callflow when global IPv6 addresses are kept. Fixes: f1705ec197e7 ("net: ipv6: Make address flushing on ifdown optional") Signed-off-by: Mike Manning Acked-by: David Ahern Signed-off-by: David S. Miller --- net/ipv6/addrconf.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'net/ipv6/addrconf.c') diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 24f1b0898e40..6287a8b9f428 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -3636,6 +3636,10 @@ 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); + addrconf_leave_solict(ifa->idev, &ifa->addr); } write_lock_bh(&idev->lock); -- cgit v1.2.3-59-g8ed1b