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 aa8bf89ec127..d0ffa642106f 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -2699,6 +2699,35 @@ dsa_slave_prechangeupper_sanity_check(struct net_device *dev, return NOTIFY_DONE; } +static int +dsa_master_prechangeupper_sanity_check(struct net_device *master, + struct netdev_notifier_changeupper_info *info) +{ + struct netlink_ext_ack *extack; + + if (!netdev_uses_dsa(master)) + return NOTIFY_DONE; + + if (!info->linking) + return NOTIFY_DONE; + + /* Allow DSA switch uppers */ + if (dsa_slave_dev_check(info->upper_dev)) + return NOTIFY_DONE; + + /* Allow bridge uppers of DSA masters, subject to further + * restrictions in dsa_bridge_prechangelower_sanity_check() + */ + if (netif_is_bridge_master(info->upper_dev)) + return NOTIFY_DONE; + + extack = netdev_notifier_info_to_extack(&info->info); + + NL_SET_ERR_MSG_MOD(extack, + "DSA master cannot join unknown upper interfaces"); + return notifier_from_errno(-EBUSY); +} + /* Don't allow bridging of DSA masters, since the bridge layer rx_handler * prevents the DSA fake ethertype handler to be invoked, so we don't get the * chance to strip off and parse the DSA switch tag protocol header (the bridge @@ -2753,6 +2782,10 @@ static int dsa_slave_netdevice_event(struct notifier_block *nb, if (notifier_to_errno(err)) return err; + err = dsa_master_prechangeupper_sanity_check(dev, info); + if (notifier_to_errno(err)) + return err; + err = dsa_bridge_prechangelower_sanity_check(dev, info); if (notifier_to_errno(err)) return err; |