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1 | /* |
2 | * Network event notifiers |
3 | * |
4 | * Authors: |
5 | * Tom Tucker <tom@opengridcomputing.com> |
6 | * Steve Wise <swise@opengridcomputing.com> |
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 | * Fixes: |
14 | */ |
15 | |
16 | #include <linux/rtnetlink.h> |
17 | #include <linux/notifier.h> |
18 | #include <net/netevent.h> |
19 | |
20 | static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain); |
21 | |
22 | /** |
23 | * register_netevent_notifier - register a netevent notifier block |
24 | * @nb: notifier |
25 | * |
26 | * Register a notifier to be called when a netevent occurs. |
27 | * The notifier passed is linked into the kernel structures and must |
28 | * not be reused until it has been unregistered. A negative errno code |
29 | * is returned on a failure. |
30 | */ |
31 | int register_netevent_notifier(struct notifier_block *nb) |
32 | { |
33 | int err; |
34 | |
35 | err = atomic_notifier_chain_register(&netevent_notif_chain, nb); |
36 | return err; |
37 | } |
38 | |
39 | /** |
40 | * netevent_unregister_notifier - unregister a netevent notifier block |
41 | * @nb: notifier |
42 | * |
43 | * Unregister a notifier previously registered by |
44 | * register_neigh_notifier(). The notifier is unlinked into the |
45 | * kernel structures and may then be reused. A negative errno code |
46 | * is returned on a failure. |
47 | */ |
48 | |
49 | int unregister_netevent_notifier(struct notifier_block *nb) |
50 | { |
51 | return atomic_notifier_chain_unregister(&netevent_notif_chain, nb); |
52 | } |
53 | |
54 | /** |
55 | * call_netevent_notifiers - call all netevent notifier blocks |
56 | * @val: value passed unmodified to notifier function |
57 | * @v: pointer passed unmodified to notifier function |
58 | * |
59 | * Call all neighbour notifier blocks. Parameters and return value |
60 | * are as for notifier_call_chain(). |
61 | */ |
62 | |
63 | int call_netevent_notifiers(unsigned long val, void *v) |
64 | { |
65 | return atomic_notifier_call_chain(&netevent_notif_chain, val, v); |
66 | } |
67 | |
68 | EXPORT_SYMBOL_GPL(register_netevent_notifier); |
69 | EXPORT_SYMBOL_GPL(unregister_netevent_notifier); |
70 | EXPORT_SYMBOL_GPL(call_netevent_notifiers); |
71 |
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