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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; | |
35 | struct net_bridge_port *p = dev->br_port; | |
36 | struct net_bridge *br; | |
37 | ||
721499e8 | 38 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
39 | return NOTIFY_DONE; |
40 | ||
1da177e4 LT |
41 | /* not a port of a bridge */ |
42 | if (p == NULL) | |
43 | return NOTIFY_DONE; | |
44 | ||
45 | br = p->br; | |
46 | ||
1da177e4 LT |
47 | switch (event) { |
48 | case NETDEV_CHANGEMTU: | |
49 | dev_set_mtu(br->dev, br_min_mtu(br)); | |
50 | break; | |
51 | ||
52 | case NETDEV_CHANGEADDR: | |
269def7c | 53 | spin_lock_bh(&br->lock); |
1da177e4 LT |
54 | br_fdb_changeaddr(p, dev->dev_addr); |
55 | br_stp_recalculate_bridge_id(br); | |
269def7c | 56 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
57 | break; |
58 | ||
4433f420 | 59 | case NETDEV_CHANGE: |
269def7c | 60 | br_port_carrier_check(p); |
1da177e4 LT |
61 | break; |
62 | ||
81d35307 | 63 | case NETDEV_FEAT_CHANGE: |
269def7c SH |
64 | spin_lock_bh(&br->lock); |
65 | if (netif_running(br->dev)) | |
81d35307 | 66 | br_features_recompute(br); |
269def7c | 67 | spin_unlock_bh(&br->lock); |
81d35307 SH |
68 | break; |
69 | ||
1da177e4 | 70 | case NETDEV_DOWN: |
269def7c | 71 | spin_lock_bh(&br->lock); |
1da177e4 LT |
72 | if (br->dev->flags & IFF_UP) |
73 | br_stp_disable_port(p); | |
269def7c | 74 | spin_unlock_bh(&br->lock); |
1da177e4 LT |
75 | break; |
76 | ||
77 | case NETDEV_UP: | |
b86c4503 SH |
78 | if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) { |
79 | spin_lock_bh(&br->lock); | |
1da177e4 | 80 | br_stp_enable_port(p); |
b86c4503 SH |
81 | spin_unlock_bh(&br->lock); |
82 | } | |
1da177e4 LT |
83 | break; |
84 | ||
85 | case NETDEV_UNREGISTER: | |
1da177e4 | 86 | br_del_if(br, dev); |
269def7c | 87 | break; |
9d6f229f | 88 | } |
1da177e4 | 89 | |
b86c4503 SH |
90 | /* Events that may cause spanning tree to refresh */ |
91 | if (event == NETDEV_CHANGEADDR || event == NETDEV_UP || | |
92 | event == NETDEV_CHANGE || event == NETDEV_DOWN) | |
93 | br_ifinfo_notify(RTM_NEWLINK, p); | |
94 | ||
1da177e4 LT |
95 | return NOTIFY_DONE; |
96 | } |