1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Network event notifiers
4 *
5 * Authors:
6 * Tom Tucker <tom@opengridcomputing.com>
7 * Steve Wise <swise@opengridcomputing.com>
8 *
9 * Fixes:
10 */
11
12 #include <linux/rtnetlink.h>
13 #include <linux/notifier.h>
14 #include <linux/export.h>
15 #include <net/netevent.h>
16
17 static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain);
18
19 /**
20 * register_netevent_notifier - register a netevent notifier block
21 * @nb: notifier
22 *
23 * Register a notifier to be called when a netevent occurs.
24 * The notifier passed is linked into the kernel structures and must
25 * not be reused until it has been unregistered. A negative errno code
26 * is returned on a failure.
27 */
28 int register_netevent_notifier(struct notifier_block *nb)
29 {
30 return atomic_notifier_chain_register(&netevent_notif_chain, nb);
31 }
32 EXPORT_SYMBOL_GPL(register_netevent_notifier);
33
34 /**
35 * unregister_netevent_notifier - unregister a netevent notifier block
36 * @nb: notifier
37 *
38 * Unregister a notifier previously registered by
39 * register_neigh_notifier(). The notifier is unlinked into the
40 * kernel structures and may then be reused. A negative errno code
41 * is returned on a failure.
42 */
43
44 int unregister_netevent_notifier(struct notifier_block *nb)
45 {
46 return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
47 }
48 EXPORT_SYMBOL_GPL(unregister_netevent_notifier);
49
50 /**
51 * call_netevent_notifiers - call all netevent notifier blocks
52 * @val: value passed unmodified to notifier function
53 * @v: pointer passed unmodified to notifier function
54 *
55 * Call all neighbour notifier blocks. Parameters and return value
56 * are as for notifier_call_chain().
57 */
58
59 int call_netevent_notifiers(unsigned long val, void *v)
60 {
61 return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
62 }
63 EXPORT_SYMBOL_GPL(call_netevent_notifiers);
64
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