07ac3ae68d8ff089000a78c19024a5d40c3baf9a
[linux-3.10.git] / 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  *      $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 #include <linux/rtnetlink.h>
18 #include <net/net_namespace.h>
19
20 #include "br_private.h"
21
22 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
23
24 struct 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.
30  *
31  * Note: don't care about up/down if bridge itself is down, because
32  *     port state is checked when bridge is brought up.
33  */
34 static 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
40         if (dev->nd_net != &init_net)
41                 return NOTIFY_DONE;
42
43         /* not a port of a bridge */
44         if (p == NULL)
45                 return NOTIFY_DONE;
46
47         br = p->br;
48
49         switch (event) {
50         case NETDEV_CHANGEMTU:
51                 dev_set_mtu(br->dev, br_min_mtu(br));
52                 break;
53
54         case NETDEV_CHANGEADDR:
55                 spin_lock_bh(&br->lock);
56                 br_fdb_changeaddr(p, dev->dev_addr);
57                 br_stp_recalculate_bridge_id(br);
58                 spin_unlock_bh(&br->lock);
59                 break;
60
61         case NETDEV_CHANGE:
62                 br_port_carrier_check(p);
63                 break;
64
65         case NETDEV_FEAT_CHANGE:
66                 spin_lock_bh(&br->lock);
67                 if (netif_running(br->dev))
68                         br_features_recompute(br);
69                 spin_unlock_bh(&br->lock);
70                 break;
71
72         case NETDEV_DOWN:
73                 spin_lock_bh(&br->lock);
74                 if (br->dev->flags & IFF_UP)
75                         br_stp_disable_port(p);
76                 spin_unlock_bh(&br->lock);
77                 break;
78
79         case NETDEV_UP:
80                 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
81                         spin_lock_bh(&br->lock);
82                         br_stp_enable_port(p);
83                         spin_unlock_bh(&br->lock);
84                 }
85                 break;
86
87         case NETDEV_UNREGISTER:
88                 br_del_if(br, dev);
89                 break;
90         }
91
92         /* 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
97         return NOTIFY_DONE;
98 }