Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / net / bridge / br_notify.c
1 /*
2  *      Device event handling
3  *      Linux ethernet bridge
4  *
5  *      Authors:
6  *      Lennert Buytenhek               <buytenh@gnu.org>
7  *
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.
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/rtnetlink.h>
16 #include <net/net_namespace.h>
17
18 #include "br_private.h"
19
20 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
21
22 struct 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  */
32 static 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         if (!net_eq(dev_net(dev), &init_net))
39                 return NOTIFY_DONE;
40
41         /* not a port of a bridge */
42         if (p == NULL)
43                 return NOTIFY_DONE;
44
45         br = p->br;
46
47         switch (event) {
48         case NETDEV_CHANGEMTU:
49                 dev_set_mtu(br->dev, br_min_mtu(br));
50                 break;
51
52         case NETDEV_CHANGEADDR:
53                 spin_lock_bh(&br->lock);
54                 br_fdb_changeaddr(p, dev->dev_addr);
55                 br_stp_recalculate_bridge_id(br);
56                 spin_unlock_bh(&br->lock);
57                 break;
58
59         case NETDEV_CHANGE:
60                 br_port_carrier_check(p);
61                 break;
62
63         case NETDEV_FEAT_CHANGE:
64                 spin_lock_bh(&br->lock);
65                 if (netif_running(br->dev))
66                         br_features_recompute(br);
67                 spin_unlock_bh(&br->lock);
68                 break;
69
70         case NETDEV_DOWN:
71                 spin_lock_bh(&br->lock);
72                 if (br->dev->flags & IFF_UP)
73                         br_stp_disable_port(p);
74                 spin_unlock_bh(&br->lock);
75                 break;
76
77         case NETDEV_UP:
78                 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
79                         spin_lock_bh(&br->lock);
80                         br_stp_enable_port(p);
81                         spin_unlock_bh(&br->lock);
82                 }
83                 break;
84
85         case NETDEV_UNREGISTER:
86                 br_del_if(br, dev);
87                 break;
88         }
89
90         /* Events that may cause spanning tree to refresh */
91         if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
92             event == NETDEV_CHANGE || event == NETDEV_DOWN)
93                 br_ifinfo_notify(RTM_NEWLINK, p);
94
95         return NOTIFY_DONE;
96 }