arm: tegra: enterprise: Controls for 3d barrier
[linux-2.6.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  *      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;
36         struct net_bridge *br;
37         bool changed_addr;
38         int err;
39
40         /* register of bridge completed, add sysfs entries */
41         if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
42                 br_sysfs_addbr(dev);
43                 return NOTIFY_DONE;
44         }
45
46         /* not a port of a bridge */
47         p = br_port_get_rtnl(dev);
48         if (!p)
49                 return NOTIFY_DONE;
50
51         br = p->br;
52
53         switch (event) {
54         case NETDEV_CHANGEMTU:
55                 dev_set_mtu(br->dev, br_min_mtu(br));
56                 break;
57
58         case NETDEV_CHANGEADDR:
59                 spin_lock_bh(&br->lock);
60                 br_fdb_changeaddr(p, dev->dev_addr);
61                 changed_addr = br_stp_recalculate_bridge_id(br);
62                 spin_unlock_bh(&br->lock);
63
64                 if (changed_addr)
65                         call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
66
67                 break;
68
69         case NETDEV_CHANGE:
70                 br_port_carrier_check(p);
71                 break;
72
73         case NETDEV_FEAT_CHANGE:
74                 netdev_update_features(br->dev);
75                 break;
76
77         case NETDEV_DOWN:
78                 spin_lock_bh(&br->lock);
79                 if (br->dev->flags & IFF_UP)
80                         br_stp_disable_port(p);
81                 spin_unlock_bh(&br->lock);
82                 break;
83
84         case NETDEV_UP:
85                 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
86                         spin_lock_bh(&br->lock);
87                         br_stp_enable_port(p);
88                         spin_unlock_bh(&br->lock);
89                 }
90                 break;
91
92         case NETDEV_UNREGISTER:
93                 br_del_if(br, dev);
94                 break;
95
96         case NETDEV_CHANGENAME:
97                 err = br_sysfs_renameif(p);
98                 if (err)
99                         return notifier_from_errno(err);
100                 break;
101
102         case NETDEV_PRE_TYPE_CHANGE:
103                 /* Forbid underlaying device to change its type. */
104                 return NOTIFY_BAD;
105         }
106
107         /* Events that may cause spanning tree to refresh */
108         if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
109             event == NETDEV_CHANGE || event == NETDEV_DOWN)
110                 br_ifinfo_notify(RTM_NEWLINK, p);
111
112         return NOTIFY_DONE;
113 }