Subject: [PATCH net-next] net/ipv6: Block IPv6 addrconf on team ports

From: Chas Williams <[email-masked]>
Date: Thu, 25 Oct 2018 17:02:27 -0400

netif_is_lag_port should be used to identify link aggregation ports.
For this to work, we need to reorganize the bonding and team drivers
so that the necessary flags are set before dev_open is called.

commit 31e77c93e432 ("sched/fair: Update blocked load when newly idle")
made this decision originally based on the IFF_SLAVE flag which isn't
used by the team driver.  Note, we do need to retain the IFF_SLAVE
check for the eql driver.

Signed-off-by: Chas Williams <[email-masked]>
---
 drivers/net/bonding/bond_main.c | 4 ++--
 drivers/net/team/team.c         | 7 +++++--
 net/ipv6/addrconf.c             | 2 +-
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index ffa37adb7681..5cdad164332b 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1536,6 +1536,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
 
 	/* set slave flag before open to prevent IPv6 addrconf */
 	slave_dev->flags |= IFF_SLAVE;
+	slave_dev->priv_flags |= IFF_BONDING;
 
 	/* open the slave since the application closed it */
 	res = dev_open(slave_dev);
@@ -1544,7 +1545,6 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
 		goto err_restore_mac;
 	}
 
-	slave_dev->priv_flags |= IFF_BONDING;
 	/* initialize slave stats */
 	dev_get_stats(new_slave->dev, &new_slave->slave_stats);
 
@@ -1804,10 +1804,10 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
 	slave_disable_netpoll(new_slave);
 
 err_close:
-	slave_dev->priv_flags &= ~IFF_BONDING;
 	dev_close(slave_dev);
 
 err_restore_mac:
+	slave_dev->priv_flags &= ~IFF_BONDING;
 	slave_dev->flags &= ~IFF_SLAVE;
 	if (!bond->params.fail_over_mac ||
 	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index db633ae9f784..8fc7d57e9f6d 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -1128,14 +1128,12 @@ static int team_upper_dev_link(struct team *team, struct team_port *port,
 					   &lag_upper_info, extack);
 	if (err)
 		return err;
-	port->dev->priv_flags |= IFF_TEAM_PORT;
 	return 0;
 }
 
 static void team_upper_dev_unlink(struct team *team, struct team_port *port)
 {
 	netdev_upper_dev_unlink(port->dev, team->dev);
-	port->dev->priv_flags &= ~IFF_TEAM_PORT;
 }
 
 static void __team_port_change_port_added(struct team_port *port, bool linkup);
@@ -1214,6 +1212,9 @@ static int team_port_add(struct team *team, struct net_device *port_dev,
 		goto err_port_enter;
 	}
 
+	/* set slave flag before open to prevent IPv6 addrconf */
+	port->dev->priv_flags |= IFF_TEAM_PORT;
+
 	err = dev_open(port_dev);
 	if (err) {
 		netdev_dbg(dev, "Device %s opening failed\n",
@@ -1292,6 +1293,7 @@ static int team_port_add(struct team *team, struct net_device *port_dev,
 	dev_close(port_dev);
 
 err_dev_open:
+	port->dev->priv_flags &= ~IFF_TEAM_PORT;
 	team_port_leave(team, port);
 	team_port_set_orig_dev_addr(port);
 
@@ -1328,6 +1330,7 @@ static int team_port_del(struct team *team, struct net_device *port_dev)
 	dev_uc_unsync(port_dev, dev);
 	dev_mc_unsync(port_dev, dev);
 	dev_close(port_dev);
+	port->dev->priv_flags &= ~IFF_TEAM_PORT;
 	team_port_leave(team, port);
 
 	__team_option_inst_mark_removed_port(team, port);
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 45b84dd5c4eb..121f863022ed 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3482,7 +3482,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
 
 	case NETDEV_UP:
 	case NETDEV_CHANGE:
-		if (dev->flags & IFF_SLAVE)
+		if (netif_is_lag_port(dev) || dev->flags & IFF_SLAVE)
 			break;
 
 		if (idev && idev->cnf.disable_ipv6)
-- 
2.14.4