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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Device event handling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
1da177e4 LT |
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> | |
11dc1f36 | 15 | #include <linux/rtnetlink.h> |
e9dc8653 | 16 | #include <net/net_namespace.h> |
1da177e4 LT |
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. | |
9d6f229f | 28 | * |
1da177e4 LT |
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; | |
f350a0a8 | 35 | struct net_bridge_port *p = br_port_get(dev); |
1da177e4 | 36 | struct net_bridge *br; |
e0f43752 | 37 | int err; |
1da177e4 LT |
38 | |
39 | /* not a port of a bridge */ | |
f350a0a8 | 40 | if (!br_port_exists(dev)) |
1da177e4 LT |
41 | return NOTIFY_DONE; |
42 | ||
f350a0a8 | 43 | p = br_port_get(dev); |
1da177e4 LT |
44 | br = p->br; |
45 | ||
1da177e4 LT |
46 | switch (event) { |
47 | case NETDEV_CHANGEMTU: | |
48 | dev_set_mtu(br->dev, br_min_mtu(br)); | |
49 | break; | |
50 | ||
51 | case NETDEV_CHANGEADDR: | |
269def7c | 52 | spin_lock_bh(&br->lock); |
1da177e4 LT |
53 | br_fdb_changeaddr(p, dev->dev_addr); |
54 | br_stp_recalculate_bridge_id(br); | |
269def7c | 55 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
56 | break; |
57 | ||
4433f420 | 58 | case NETDEV_CHANGE: |
269def7c | 59 | br_port_carrier_check(p); |
1da177e4 LT |
60 | break; |
61 | ||
81d35307 | 62 | case NETDEV_FEAT_CHANGE: |
269def7c SH |
63 | spin_lock_bh(&br->lock); |
64 | if (netif_running(br->dev)) | |
81d35307 | 65 | br_features_recompute(br); |
269def7c | 66 | spin_unlock_bh(&br->lock); |
81d35307 SH |
67 | break; |
68 | ||
1da177e4 | 69 | case NETDEV_DOWN: |
269def7c | 70 | spin_lock_bh(&br->lock); |
1da177e4 LT |
71 | if (br->dev->flags & IFF_UP) |
72 | br_stp_disable_port(p); | |
269def7c | 73 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
74 | break; |
75 | ||
76 | case NETDEV_UP: | |
b86c4503 SH |
77 | if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) { |
78 | spin_lock_bh(&br->lock); | |
1da177e4 | 79 | br_stp_enable_port(p); |
b86c4503 SH |
80 | spin_unlock_bh(&br->lock); |
81 | } | |
1da177e4 LT |
82 | break; |
83 | ||
84 | case NETDEV_UNREGISTER: | |
1da177e4 | 85 | br_del_if(br, dev); |
269def7c | 86 | break; |
1c01fe14 | 87 | |
e0f43752 SA |
88 | case NETDEV_CHANGENAME: |
89 | err = br_sysfs_renameif(p); | |
90 | if (err) | |
91 | return notifier_from_errno(err); | |
92 | break; | |
93 | ||
1c01fe14 JP |
94 | case NETDEV_PRE_TYPE_CHANGE: |
95 | /* Forbid underlaying device to change its type. */ | |
96 | return NOTIFY_BAD; | |
9d6f229f | 97 | } |
1da177e4 | 98 | |
b86c4503 SH |
99 | /* 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 | ||
1da177e4 LT |
104 | return NOTIFY_DONE; |
105 | } |