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 spin_lock_bh(&br
->lock
);
70 if (netif_running(br
->dev
))
71 br_features_recompute(br
);
72 spin_unlock_bh(&br
->lock
);
76 spin_lock_bh(&br
->lock
);
77 if (br
->dev
->flags
& IFF_UP
)
78 br_stp_disable_port(p
);
79 spin_unlock_bh(&br
->lock
);
83 if (netif_carrier_ok(dev
) && (br
->dev
->flags
& IFF_UP
)) {
84 spin_lock_bh(&br
->lock
);
85 br_stp_enable_port(p
);
86 spin_unlock_bh(&br
->lock
);
90 case NETDEV_UNREGISTER
:
94 case NETDEV_CHANGENAME
:
95 err
= br_sysfs_renameif(p
);
97 return notifier_from_errno(err
);
100 case NETDEV_PRE_TYPE_CHANGE
:
101 /* Forbid underlaying device to change its type. */
105 /* Events that may cause spanning tree to refresh */
106 if (event
== NETDEV_CHANGEADDR
|| event
== NETDEV_UP
||
107 event
== NETDEV_CHANGE
|| event
== NETDEV_DOWN
)
108 br_ifinfo_notify(RTM_NEWLINK
, p
);