blob: 00644a544e3cdbb276975ce619ae0e7a93be9dbf [file] [log] [blame]
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>
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070017#include <linux/rtnetlink.h>
Eric W. Biedermane9dc8652007-09-12 13:02:17 +020018#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20#include "br_private.h"
21
22static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
23
24struct notifier_block br_device_notifier = {
25 .notifier_call = br_device_event
26};
27
28/*
29 * Handle changes in state of network devices enslaved to a bridge.
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090030 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 * Note: don't care about up/down if bridge itself is down, because
32 * port state is checked when bridge is brought up.
33 */
34static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
35{
36 struct net_device *dev = ptr;
37 struct net_bridge_port *p = dev->br_port;
38 struct net_bridge *br;
39
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +090040 if (dev_net(dev) != &init_net)
Eric W. Biedermane9dc8652007-09-12 13:02:17 +020041 return NOTIFY_DONE;
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 /* not a port of a bridge */
44 if (p == NULL)
45 return NOTIFY_DONE;
46
47 br = p->br;
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 switch (event) {
50 case NETDEV_CHANGEMTU:
51 dev_set_mtu(br->dev, br_min_mtu(br));
52 break;
53
54 case NETDEV_CHANGEADDR:
Stephen Hemminger269def72007-02-22 01:10:18 -080055 spin_lock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 br_fdb_changeaddr(p, dev->dev_addr);
57 br_stp_recalculate_bridge_id(br);
Stephen Hemminger269def72007-02-22 01:10:18 -080058 spin_unlock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 break;
60
Stephen Hemminger4433f422005-12-20 15:19:51 -080061 case NETDEV_CHANGE:
Stephen Hemminger269def72007-02-22 01:10:18 -080062 br_port_carrier_check(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 break;
64
Stephen Hemminger81d35302005-05-29 14:15:17 -070065 case NETDEV_FEAT_CHANGE:
Stephen Hemminger269def72007-02-22 01:10:18 -080066 spin_lock_bh(&br->lock);
67 if (netif_running(br->dev))
Stephen Hemminger81d35302005-05-29 14:15:17 -070068 br_features_recompute(br);
Stephen Hemminger269def72007-02-22 01:10:18 -080069 spin_unlock_bh(&br->lock);
Stephen Hemminger81d35302005-05-29 14:15:17 -070070 break;
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 case NETDEV_DOWN:
Stephen Hemminger269def72007-02-22 01:10:18 -080073 spin_lock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 if (br->dev->flags & IFF_UP)
75 br_stp_disable_port(p);
Stephen Hemminger269def72007-02-22 01:10:18 -080076 spin_unlock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 break;
78
79 case NETDEV_UP:
Stephen Hemmingerb86c4502007-03-22 14:08:46 -070080 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
81 spin_lock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 br_stp_enable_port(p);
Stephen Hemmingerb86c4502007-03-22 14:08:46 -070083 spin_unlock_bh(&br->lock);
84 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 break;
86
87 case NETDEV_UNREGISTER:
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 br_del_if(br, dev);
Stephen Hemminger269def72007-02-22 01:10:18 -080089 break;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090090 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Stephen Hemmingerb86c4502007-03-22 14:08:46 -070092 /* Events that may cause spanning tree to refresh */
93 if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
94 event == NETDEV_CHANGE || event == NETDEV_DOWN)
95 br_ifinfo_notify(RTM_NEWLINK, p);
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 return NOTIFY_DONE;
98}