projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 792d1932 TT |
1 | /* |
| 2 | * Network event notifiers | |
| 3 | * | |
| 4 | * Authors: | |
| 5 | * Tom Tucker <[email protected]> | |
| 6 | * Steve Wise <[email protected]> | |
| 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> | |
| 94b83419 | 18 | #include <net/netevent.h> |
| 792d1932 TT |
19 | |
| 20 | static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain); | |
| 21 | ||
| 22 | /** | |
| 23 | * register_netevent_notifier - register a netevent notifier block | |
| 24 | * @nb: notifier | |
| 25 | * | |
| 26 | * Register a notifier to be called when a netevent occurs. | |
| 27 | * The notifier passed is linked into the kernel structures and must | |
| 28 | * not be reused until it has been unregistered. A negative errno code | |
| 29 | * is returned on a failure. | |
| 30 | */ | |
| 31 | int register_netevent_notifier(struct notifier_block *nb) | |
| 32 | { | |
| 33 | int err; | |
| 34 | ||
| 35 | err = atomic_notifier_chain_register(&netevent_notif_chain, nb); | |
| 36 | return err; | |
| 37 | } | |
| 38 | ||
| 39 | /** | |
| 40 | * netevent_unregister_notifier - unregister a netevent notifier block | |
| 41 | * @nb: notifier | |
| 42 | * | |
| 43 | * Unregister a notifier previously registered by | |
| 44 | * register_neigh_notifier(). The notifier is unlinked into the | |
| 45 | * kernel structures and may then be reused. A negative errno code | |
| 46 | * is returned on a failure. | |
| 47 | */ | |
| 48 | ||
| 49 | int unregister_netevent_notifier(struct notifier_block *nb) | |
| 50 | { | |
| 51 | return atomic_notifier_chain_unregister(&netevent_notif_chain, nb); | |
| 52 | } | |
| 53 | ||
| 54 | /** | |
| 55 | * call_netevent_notifiers - call all netevent notifier blocks | |
| 56 | * @val: value passed unmodified to notifier function | |
| 57 | * @v: pointer passed unmodified to notifier function | |
| 58 | * | |
| 59 | * Call all neighbour notifier blocks. Parameters and return value | |
| 60 | * are as for notifier_call_chain(). | |
| 61 | */ | |
| 62 | ||
| 63 | int call_netevent_notifiers(unsigned long val, void *v) | |
| 64 | { | |
| 65 | return atomic_notifier_call_chain(&netevent_notif_chain, val, v); | |
| 66 | } | |
| 67 | ||
| 68 | EXPORT_SYMBOL_GPL(register_netevent_notifier); | |
| 69 | EXPORT_SYMBOL_GPL(unregister_netevent_notifier); | |
| 70 | EXPORT_SYMBOL_GPL(call_netevent_notifiers); |