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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 | * | |
8 | * $Id: br_notify.c,v 1.2 2000/02/21 15:51:34 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.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 | spin_lock_bh(&br->lock); | |
45 | switch (event) { | |
46 | case NETDEV_CHANGEMTU: | |
47 | dev_set_mtu(br->dev, br_min_mtu(br)); | |
48 | break; | |
49 | ||
50 | case NETDEV_CHANGEADDR: | |
51 | br_fdb_changeaddr(p, dev->dev_addr); | |
52 | br_stp_recalculate_bridge_id(br); | |
53 | break; | |
54 | ||
55 | case NETDEV_CHANGE: /* device is up but carrier changed */ | |
56 | if (!(br->dev->flags & IFF_UP)) | |
57 | break; | |
58 | ||
59 | if (netif_carrier_ok(dev)) { | |
60 | if (p->state == BR_STATE_DISABLED) | |
61 | br_stp_enable_port(p); | |
62 | } else { | |
63 | if (p->state != BR_STATE_DISABLED) | |
64 | br_stp_disable_port(p); | |
65 | } | |
66 | break; | |
67 | ||
81d35307 SH |
68 | case NETDEV_FEAT_CHANGE: |
69 | if (br->dev->flags & IFF_UP) | |
70 | br_features_recompute(br); | |
71 | ||
72 | /* could do recursive feature change notification | |
73 | * but who would care?? | |
74 | */ | |
75 | break; | |
76 | ||
1da177e4 LT |
77 | case NETDEV_DOWN: |
78 | if (br->dev->flags & IFF_UP) | |
79 | br_stp_disable_port(p); | |
80 | break; | |
81 | ||
82 | case NETDEV_UP: | |
83 | if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) | |
84 | br_stp_enable_port(p); | |
85 | break; | |
86 | ||
87 | case NETDEV_UNREGISTER: | |
88 | spin_unlock_bh(&br->lock); | |
89 | br_del_if(br, dev); | |
90 | goto done; | |
91 | } | |
92 | spin_unlock_bh(&br->lock); | |
93 | ||
94 | done: | |
95 | return NOTIFY_DONE; | |
96 | } |