| Tom Tucker | 792d193 | 2006-07-30 20:43:26 -0700 | [diff] [blame] | 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 | |
| 19 | static 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 | */ |
| 30 | int 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 | |
| 48 | int 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 | |
| 62 | int call_netevent_notifiers(unsigned long val, void *v) |
| 63 | { |
| 64 | return atomic_notifier_call_chain(&netevent_notif_chain, val, v); |
| 65 | } |
| 66 | |
| 67 | EXPORT_SYMBOL_GPL(register_netevent_notifier); |
| 68 | EXPORT_SYMBOL_GPL(unregister_netevent_notifier); |
| 69 | EXPORT_SYMBOL_GPL(call_netevent_notifiers); |