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Tom Tucker792d1932006-07-30 20:43:26 -07001/*
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>
Adrian Bunk94b83412007-07-05 17:06:21 -070018#include <net/netevent.h>
Tom Tucker792d1932006-07-30 20:43:26 -070019
20static 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 */
31int 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}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +000038EXPORT_SYMBOL_GPL(register_netevent_notifier);
Tom Tucker792d1932006-07-30 20:43:26 -070039
40/**
41 * netevent_unregister_notifier - unregister a netevent notifier block
42 * @nb: notifier
43 *
44 * Unregister a notifier previously registered by
45 * register_neigh_notifier(). The notifier is unlinked into the
46 * kernel structures and may then be reused. A negative errno code
47 * is returned on a failure.
48 */
49
50int unregister_netevent_notifier(struct notifier_block *nb)
51{
52 return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
53}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +000054EXPORT_SYMBOL_GPL(unregister_netevent_notifier);
Tom Tucker792d1932006-07-30 20:43:26 -070055
56/**
57 * call_netevent_notifiers - call all netevent notifier blocks
58 * @val: value passed unmodified to notifier function
59 * @v: pointer passed unmodified to notifier function
60 *
61 * Call all neighbour notifier blocks. Parameters and return value
62 * are as for notifier_call_chain().
63 */
64
65int call_netevent_notifiers(unsigned long val, void *v)
66{
67 return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
68}
Tom Tucker792d1932006-07-30 20:43:26 -070069EXPORT_SYMBOL_GPL(call_netevent_notifiers);