diff options
Diffstat (limited to 'net/dsa/slave.c')
| -rw-r--r-- | net/dsa/slave.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/net/dsa/slave.c b/net/dsa/slave.c index 43763b22fbef..89f03fde760e 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -303,6 +303,28 @@ static int dsa_slave_port_attr_set(struct net_device *dev, return ret; } +/* Must be called under rcu_read_lock() */ +static int +dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave, + const struct switchdev_obj_port_vlan *vlan) +{ + struct net_device *upper_dev; + struct list_head *iter; + + netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) { + u16 vid; + + if (!is_vlan_dev(upper_dev)) + continue; + + vid = vlan_dev_vlan_id(upper_dev); + if (vid >= vlan->vid_begin && vid <= vlan->vid_end) + return -EBUSY; + } + + return 0; +} + static int dsa_slave_vlan_add(struct net_device *dev, const struct switchdev_obj *obj, struct switchdev_trans *trans) @@ -319,6 +341,17 @@ static int dsa_slave_vlan_add(struct net_device *dev, vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj); + /* Deny adding a bridge VLAN when there is already an 802.1Q upper with + * the same VID. + */ + if (trans->ph_prepare) { + rcu_read_lock(); + err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan); + rcu_read_unlock(); + if (err) + return err; + } + err = dsa_port_vlan_add(dp, &vlan, trans); if (err) return err; |