Patch "net: ipv6: Always leave anycast and multicast groups on link down" has been added to the 4.7-stable tree

Patch "net: ipv6: Always leave anycast and multicast groups on link down" has been added to the 4.7-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    net: ipv6: Always leave anycast and multicast groups on link down

to the 4.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-ipv6-always-leave-anycast-and-multicast-groups-on-link-down.patch
and it can be found in the queue-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Fri Aug 12 09:34:44 CEST 2016
From: Mike Manning <mmanning@brocade.com>
Date: Fri, 22 Jul 2016 18:32:11 +0100
Subject: net: ipv6: Always leave anycast and multicast groups on link down

From: Mike Manning <mmanning@brocade.com>

[ Upstream commit ea06f7176413e2538d13bb85b65387d0917943d9 ]

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 <mmanning@brocade.com>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv6/addrconf.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3562,6 +3562,10 @@ 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);


Patches currently in stable-queue which might be from mmanning@brocade.com are

queue-4.7/net-ipv6-always-leave-anycast-and-multicast-groups-on-link-down.patch