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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 | /* not a port of a bridge */ |
39 | if (p == NULL) |
40 | return NOTIFY_DONE; |
41 | |
42 | br = p->br; |
43 | |
44 | switch (event) { |
45 | case NETDEV_CHANGEMTU: |
46 | dev_set_mtu(br->dev, br_min_mtu(br)); |
47 | break; |
48 | |
49 | case NETDEV_CHANGEADDR: |
50 | spin_lock_bh(&br->lock); |
51 | br_fdb_changeaddr(p, dev->dev_addr); |
52 | br_stp_recalculate_bridge_id(br); |
53 | spin_unlock_bh(&br->lock); |
54 | break; |
55 | |
56 | case NETDEV_CHANGE: |
57 | br_port_carrier_check(p); |
58 | break; |
59 | |
60 | case NETDEV_FEAT_CHANGE: |
61 | spin_lock_bh(&br->lock); |
62 | if (netif_running(br->dev)) |
63 | br_features_recompute(br); |
64 | spin_unlock_bh(&br->lock); |
65 | break; |
66 | |
67 | case NETDEV_DOWN: |
68 | spin_lock_bh(&br->lock); |
69 | if (br->dev->flags & IFF_UP) |
70 | br_stp_disable_port(p); |
71 | spin_unlock_bh(&br->lock); |
72 | break; |
73 | |
74 | case NETDEV_UP: |
75 | if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) { |
76 | spin_lock_bh(&br->lock); |
77 | br_stp_enable_port(p); |
78 | spin_unlock_bh(&br->lock); |
79 | } |
80 | break; |
81 | |
82 | case NETDEV_UNREGISTER: |
83 | br_del_if(br, dev); |
84 | break; |
85 | } |
86 | |
87 | /* Events that may cause spanning tree to refresh */ |
88 | if (event == NETDEV_CHANGEADDR || event == NETDEV_UP || |
89 | event == NETDEV_CHANGE || event == NETDEV_DOWN) |
90 | br_ifinfo_notify(RTM_NEWLINK, p); |
91 | |
92 | return NOTIFY_DONE; |
93 | } |
94 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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