linux/net/core/netevent.c
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   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
  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{
  30        return atomic_notifier_chain_register(&netevent_notif_chain, nb);
  31}
  32EXPORT_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
  44int unregister_netevent_notifier(struct notifier_block *nb)
  45{
  46        return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
  47}
  48EXPORT_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
  59int call_netevent_notifiers(unsigned long val, void *v)
  60{
  61        return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
  62}
  63EXPORT_SYMBOL_GPL(call_netevent_notifiers);
  64