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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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * 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.
12 */
13
14#include <linux/kernel.h>
Stephen Hemminger11dc1f32006-05-25 16:00:12 -070015#include <linux/rtnetlink.h>
Eric W. Biedermane9dc8652007-09-12 13:02:17 +020016#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
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.
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090028 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 * 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;
Jiri Pirkof350a0a82010-06-15 06:50:45 +000035 struct net_bridge_port *p = br_port_get(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 struct net_bridge *br;
Simon Arlotte0f43752010-05-10 09:31:11 +000037 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39 /* not a port of a bridge */
Jiri Pirkof350a0a82010-06-15 06:50:45 +000040 if (!br_port_exists(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 return NOTIFY_DONE;
42
Jiri Pirkof350a0a82010-06-15 06:50:45 +000043 p = br_port_get(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 br = p->br;
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 switch (event) {
47 case NETDEV_CHANGEMTU:
48 dev_set_mtu(br->dev, br_min_mtu(br));
49 break;
50
51 case NETDEV_CHANGEADDR:
Stephen Hemminger269def72007-02-22 01:10:18 -080052 spin_lock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 br_fdb_changeaddr(p, dev->dev_addr);
54 br_stp_recalculate_bridge_id(br);
Stephen Hemminger269def72007-02-22 01:10:18 -080055 spin_unlock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 break;
57
Stephen Hemminger4433f422005-12-20 15:19:51 -080058 case NETDEV_CHANGE:
Stephen Hemminger269def72007-02-22 01:10:18 -080059 br_port_carrier_check(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 break;
61
Stephen Hemminger81d35302005-05-29 14:15:17 -070062 case NETDEV_FEAT_CHANGE:
Stephen Hemminger269def72007-02-22 01:10:18 -080063 spin_lock_bh(&br->lock);
64 if (netif_running(br->dev))
Stephen Hemminger81d35302005-05-29 14:15:17 -070065 br_features_recompute(br);
Stephen Hemminger269def72007-02-22 01:10:18 -080066 spin_unlock_bh(&br->lock);
Stephen Hemminger81d35302005-05-29 14:15:17 -070067 break;
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 case NETDEV_DOWN:
Stephen Hemminger269def72007-02-22 01:10:18 -080070 spin_lock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 if (br->dev->flags & IFF_UP)
72 br_stp_disable_port(p);
Stephen Hemminger269def72007-02-22 01:10:18 -080073 spin_unlock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 break;
75
76 case NETDEV_UP:
Stephen Hemmingerb86c4502007-03-22 14:08:46 -070077 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
78 spin_lock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 br_stp_enable_port(p);
Stephen Hemmingerb86c4502007-03-22 14:08:46 -070080 spin_unlock_bh(&br->lock);
81 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 break;
83
84 case NETDEV_UNREGISTER:
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 br_del_if(br, dev);
Stephen Hemminger269def72007-02-22 01:10:18 -080086 break;
Jiri Pirko1c01fe12010-03-10 10:30:19 +000087
Simon Arlotte0f43752010-05-10 09:31:11 +000088 case NETDEV_CHANGENAME:
89 err = br_sysfs_renameif(p);
90 if (err)
91 return notifier_from_errno(err);
92 break;
93
Jiri Pirko1c01fe12010-03-10 10:30:19 +000094 case NETDEV_PRE_TYPE_CHANGE:
95 /* Forbid underlaying device to change its type. */
96 return NOTIFY_BAD;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090097 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Stephen Hemmingerb86c4502007-03-22 14:08:46 -070099 /* Events that may cause spanning tree to refresh */
100 if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
101 event == NETDEV_CHANGE || event == NETDEV_DOWN)
102 br_ifinfo_notify(RTM_NEWLINK, p);
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 return NOTIFY_DONE;
105}