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authorTom Tucker <tom@opengridcomputing.com>2006-07-30 23:43:26 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2006-08-02 16:38:20 -0400
commit792d1932e319ff8ba01361e7d151b1794c55c31f (patch)
treee4259bbccab44d311f7fd3d3ffc18557ae52c49c /net
parent3687b1dc6fe83a500ba4d3235704594f6a111a2d (diff)
[NET]: Network Event Notifier Mechanism.
This patch uses notifier blocks to implement a network event notifier mechanism. Clients register their callback function by calling register_netevent_notifier() like this: static struct notifier_block nb = { .notifier_call = my_callback_func }; ... register_netevent_notifier(&nb); Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/netevent.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/net/core/netevent.c b/net/core/netevent.c
new file mode 100644
index 000000000000..35d02c38554e
--- /dev/null
+++ b/net/core/netevent.c
@@ -0,0 +1,69 @@
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
19static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain);
20
21/**
22 * register_netevent_notifier - register a netevent notifier block
23 * @nb: notifier
24 *
25 * Register a notifier to be called when a netevent occurs.
26 * The notifier passed is linked into the kernel structures and must
27 * not be reused until it has been unregistered. A negative errno code
28 * is returned on a failure.
29 */
30int register_netevent_notifier(struct notifier_block *nb)
31{
32 int err;
33
34 err = atomic_notifier_chain_register(&netevent_notif_chain, nb);
35 return err;
36}
37
38/**
39 * netevent_unregister_notifier - unregister a netevent notifier block
40 * @nb: notifier
41 *
42 * Unregister a notifier previously registered by
43 * register_neigh_notifier(). The notifier is unlinked into the
44 * kernel structures and may then be reused. A negative errno code
45 * is returned on a failure.
46 */
47
48int unregister_netevent_notifier(struct notifier_block *nb)
49{
50 return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
51}
52
53/**
54 * call_netevent_notifiers - call all netevent notifier blocks
55 * @val: value passed unmodified to notifier function
56 * @v: pointer passed unmodified to notifier function
57 *
58 * Call all neighbour notifier blocks. Parameters and return value
59 * are as for notifier_call_chain().
60 */
61
62int call_netevent_notifiers(unsigned long val, void *v)
63{
64 return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
65}
66
67EXPORT_SYMBOL_GPL(register_netevent_notifier);
68EXPORT_SYMBOL_GPL(unregister_netevent_notifier);
69EXPORT_SYMBOL_GPL(call_netevent_notifiers);