Commit | Line | Data |
---|---|---|
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; | |
35 | struct net_bridge_port *p = dev->br_port; | |
36 | struct net_bridge *br; | |
e0f43752 | 37 | int err; |
1da177e4 LT |
38 | |
39 | /* not a port of a bridge */ | |
40 | if (p == NULL) | |
41 | return NOTIFY_DONE; | |
42 | ||
43 | br = p->br; | |
44 | ||
1da177e4 LT |
45 | switch (event) { |
46 | case NETDEV_CHANGEMTU: | |
47 | dev_set_mtu(br->dev, br_min_mtu(br)); | |
48 | break; | |
49 | ||
50 | case NETDEV_CHANGEADDR: | |
269def7c | 51 | spin_lock_bh(&br->lock); |
1da177e4 LT |
52 | br_fdb_changeaddr(p, dev->dev_addr); |
53 | br_stp_recalculate_bridge_id(br); | |
269def7c | 54 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
55 | break; |
56 | ||
4433f420 | 57 | case NETDEV_CHANGE: |
269def7c | 58 | br_port_carrier_check(p); |
1da177e4 LT |
59 | break; |
60 | ||
81d35307 | 61 | case NETDEV_FEAT_CHANGE: |
269def7c SH |
62 | spin_lock_bh(&br->lock); |
63 | if (netif_running(br->dev)) | |
81d35307 | 64 | br_features_recompute(br); |
269def7c | 65 | spin_unlock_bh(&br->lock); |
81d35307 SH |
66 | break; |
67 | ||
1da177e4 | 68 | case NETDEV_DOWN: |
269def7c | 69 | spin_lock_bh(&br->lock); |
1da177e4 LT |
70 | if (br->dev->flags & IFF_UP) |
71 | br_stp_disable_port(p); | |
269def7c | 72 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
73 | break; |
74 | ||
75 | case NETDEV_UP: | |
b86c4503 SH |
76 | if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) { |
77 | spin_lock_bh(&br->lock); | |
1da177e4 | 78 | br_stp_enable_port(p); |
b86c4503 SH |
79 | spin_unlock_bh(&br->lock); |
80 | } | |
1da177e4 LT |
81 | break; |
82 | ||
83 | case NETDEV_UNREGISTER: | |
1da177e4 | 84 | br_del_if(br, dev); |
269def7c | 85 | break; |
1c01fe14 | 86 | |
e0f43752 SA |
87 | case NETDEV_CHANGENAME: |
88 | err = br_sysfs_renameif(p); | |
89 | if (err) | |
90 | return notifier_from_errno(err); | |
91 | break; | |
92 | ||
1c01fe14 JP |
93 | case NETDEV_PRE_TYPE_CHANGE: |
94 | /* Forbid underlaying device to change its type. */ | |
95 | return NOTIFY_BAD; | |
9d6f229f | 96 | } |
1da177e4 | 97 | |
b86c4503 SH |
98 | /* Events that may cause spanning tree to refresh */ |
99 | if (event == NETDEV_CHANGEADDR || event == NETDEV_UP || | |
100 | event == NETDEV_CHANGE || event == NETDEV_DOWN) | |
101 | br_ifinfo_notify(RTM_NEWLINK, p); | |
102 | ||
1da177e4 LT |
103 | return NOTIFY_DONE; |
104 | } |