Merge tag 'fixes-2023-01-08' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt...
[linux-block.git] / net / core / netevent.c
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2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
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2/*
3 * Network event notifiers
4 *
5 * Authors:
6 * Tom Tucker <tom@opengridcomputing.com>
7 * Steve Wise <swise@opengridcomputing.com>
8 *
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9 * Fixes:
10 */
11
12#include <linux/rtnetlink.h>
13#include <linux/notifier.h>
bc3b2d7f 14#include <linux/export.h>
94b83419 15#include <net/netevent.h>
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16
17static 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 */
28int register_netevent_notifier(struct notifier_block *nb)
29{
282c320d 30 return atomic_notifier_chain_register(&netevent_notif_chain, nb);
792d1932 31}
9e34a5b5 32EXPORT_SYMBOL_GPL(register_netevent_notifier);
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33
34/**
bb2882bc 35 * unregister_netevent_notifier - unregister a netevent notifier block
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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
44int unregister_netevent_notifier(struct notifier_block *nb)
45{
46 return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
47}
9e34a5b5 48EXPORT_SYMBOL_GPL(unregister_netevent_notifier);
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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
59int call_netevent_notifiers(unsigned long val, void *v)
60{
61 return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
62}
792d1932 63EXPORT_SYMBOL_GPL(call_netevent_notifiers);