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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