From: Hangbin Liu liuhangbin@gmail.com
[ Upstream commit fd16eb948ea8b28afb03e11a5b11841e6ac2aa2b ]
When a link is enslave to bond, it need to set the interface down first. This makes the slave remove mac multicast address 33:33:00:00:00:01(The IPv6 multicast address ff02::1 is kept even when the interface down). When bond set the slave up, ipv6_mc_up() was not called due to commit c2edacf80e15 ("bonding / ipv6: no addrconf for slaves separately from master").
This is not an issue before we adding the lladdr target feature for bonding, as the mac multicast address will be added back when bond interface up and join group ff02::1.
But after adding lladdr target feature for bonding. When user set a lladdr target, the unsolicited NA message with all-nodes multicast dest will be dropped as the slave interface never add 33:33:00:00:00:01 back.
Fix this by calling ipv6_mc_up() to add 33:33:00:00:00:01 back when the slave interface up.
Reported-by: LiLiang liali@redhat.com Fixes: 5e1eeef69c0f ("bonding: NS target should accept link local address") Signed-off-by: Hangbin Liu liuhangbin@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv6/addrconf.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index b738eb7e1cae8..04cf06866e765 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -3557,11 +3557,15 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, fallthrough; case NETDEV_UP: case NETDEV_CHANGE: - if (dev->flags & IFF_SLAVE) + if (idev && idev->cnf.disable_ipv6) break;
- if (idev && idev->cnf.disable_ipv6) + if (dev->flags & IFF_SLAVE) { + if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && + dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) + ipv6_mc_up(idev); break; + }
if (event == NETDEV_UP) { /* restore routes for permanent addresses */