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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Device event handling
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Lennert Buytenhek <buytenh@gnu.org>
7 *
8 * $Id: br_notify.c,v 1.2 2000/02/21 15:51:34 davem Exp $
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16#include <linux/kernel.h>
17
18#include "br_private.h"
19
20static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
21
22struct notifier_block br_device_notifier = {
23 .notifier_call = br_device_event
24};
25
26/*
27 * Handle changes in state of network devices enslaved to a bridge.
28 *
29 * Note: don't care about up/down if bridge itself is down, because
30 * port state is checked when bridge is brought up.
31 */
32static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
33{
34 struct net_device *dev = ptr;
35 struct net_bridge_port *p = dev->br_port;
36 struct net_bridge *br;
37
38 /* not a port of a bridge */
39 if (p == NULL)
40 return NOTIFY_DONE;
41
42 br = p->br;
43
44 spin_lock_bh(&br->lock);
45 switch (event) {
46 case NETDEV_CHANGEMTU:
47 dev_set_mtu(br->dev, br_min_mtu(br));
48 break;
49
50 case NETDEV_CHANGEADDR:
51 br_fdb_changeaddr(p, dev->dev_addr);
52 br_stp_recalculate_bridge_id(br);
53 break;
54
Stephen Hemminger4433f422005-12-20 15:19:51 -080055 case NETDEV_CHANGE:
56 if (br->dev->flags & IFF_UP)
57 schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 break;
59
Stephen Hemminger81d35302005-05-29 14:15:17 -070060 case NETDEV_FEAT_CHANGE:
61 if (br->dev->flags & IFF_UP)
62 br_features_recompute(br);
63
64 /* could do recursive feature change notification
65 * but who would care??
66 */
67 break;
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 case NETDEV_DOWN:
70 if (br->dev->flags & IFF_UP)
71 br_stp_disable_port(p);
72 break;
73
74 case NETDEV_UP:
75 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP))
76 br_stp_enable_port(p);
77 break;
78
79 case NETDEV_UNREGISTER:
80 spin_unlock_bh(&br->lock);
81 br_del_if(br, dev);
82 goto done;
83 }
84 spin_unlock_bh(&br->lock);
85
86 done:
87 return NOTIFY_DONE;
88}