2 * Device event handling
3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
14 #include <linux/kernel.h>
15 #include <linux/rtnetlink.h>
16 #include <net/net_namespace.h>
18 #include "br_private.h"
20 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
22 struct notifier_block br_device_notifier = {
23 .notifier_call = br_device_event
27 * Handle changes in state of network devices enslaved to a bridge.
29 * Note: don't care about up/down if bridge itself is down, because
30 * port state is checked when bridge is brought up.
32 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
34 struct net_device *dev = ptr;
35 struct net_bridge_port *p;
36 struct net_bridge *br;
39 /* register of bridge completed, add sysfs entries */
40 if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
45 /* not a port of a bridge */
46 p = br_port_get_rtnl(dev);
53 case NETDEV_CHANGEMTU:
54 dev_set_mtu(br->dev, br_min_mtu(br));
57 case NETDEV_CHANGEADDR:
58 spin_lock_bh(&br->lock);
59 br_fdb_changeaddr(p, dev->dev_addr);
60 br_stp_recalculate_bridge_id(br);
61 spin_unlock_bh(&br->lock);
65 br_port_carrier_check(p);
68 case NETDEV_FEAT_CHANGE:
69 netdev_update_features(br->dev);
73 spin_lock_bh(&br->lock);
74 if (br->dev->flags & IFF_UP)
75 br_stp_disable_port(p);
76 spin_unlock_bh(&br->lock);
80 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
81 spin_lock_bh(&br->lock);
82 br_stp_enable_port(p);
83 spin_unlock_bh(&br->lock);
87 case NETDEV_UNREGISTER:
91 case NETDEV_CHANGENAME:
92 err = br_sysfs_renameif(p);
94 return notifier_from_errno(err);
97 case NETDEV_PRE_TYPE_CHANGE:
98 /* Forbid underlaying device to change its type. */
102 /* Events that may cause spanning tree to refresh */
103 if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
104 event == NETDEV_CHANGE || event == NETDEV_DOWN)
105 br_ifinfo_notify(RTM_NEWLINK, p);