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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; | |
36 | struct net_bridge *br; | |
37 | int err; | |
38 | ||
39 | /* not a port of a bridge */ | |
40 | p = br_port_get_rtnl(dev); | |
41 | if (!p) | |
42 | return NOTIFY_DONE; | |
43 | ||
44 | br = p->br; | |
45 | ||
46 | switch (event) { | |
47 | case NETDEV_CHANGEMTU: | |
48 | dev_set_mtu(br->dev, br_min_mtu(br)); | |
49 | break; | |
50 | ||
51 | case NETDEV_CHANGEADDR: | |
52 | spin_lock_bh(&br->lock); | |
53 | br_fdb_changeaddr(p, dev->dev_addr); | |
54 | br_stp_recalculate_bridge_id(br); | |
55 | spin_unlock_bh(&br->lock); | |
56 | break; | |
57 | ||
58 | case NETDEV_CHANGE: | |
59 | br_port_carrier_check(p); | |
60 | break; | |
61 | ||
62 | case NETDEV_FEAT_CHANGE: | |
63 | spin_lock_bh(&br->lock); | |
64 | if (netif_running(br->dev)) | |
65 | br_features_recompute(br); | |
66 | spin_unlock_bh(&br->lock); | |
67 | break; | |
68 | ||
69 | case NETDEV_DOWN: | |
70 | spin_lock_bh(&br->lock); | |
71 | if (br->dev->flags & IFF_UP) | |
72 | br_stp_disable_port(p); | |
73 | spin_unlock_bh(&br->lock); | |
74 | break; | |
75 | ||
76 | case NETDEV_UP: | |
77 | if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) { | |
78 | spin_lock_bh(&br->lock); | |
79 | br_stp_enable_port(p); | |
80 | spin_unlock_bh(&br->lock); | |
81 | } | |
82 | break; | |
83 | ||
84 | case NETDEV_UNREGISTER: | |
85 | br_del_if(br, dev); | |
86 | break; | |
87 | ||
88 | case NETDEV_CHANGENAME: | |
89 | err = br_sysfs_renameif(p); | |
90 | if (err) | |
91 | return notifier_from_errno(err); | |
92 | break; | |
93 | ||
94 | case NETDEV_PRE_TYPE_CHANGE: | |
95 | /* Forbid underlaying device to change its type. */ | |
96 | return NOTIFY_BAD; | |
97 | } | |
98 | ||
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 | ||
104 | return NOTIFY_DONE; | |
105 | } |