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 #include <linux/export.h> 19 #include <net/netevent.h> 20 21 static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain); 22 23 /** 24 * register_netevent_notifier - register a netevent notifier block 25 * @nb: notifier 26 * 27 * Register a notifier to be called when a netevent occurs. 28 * The notifier passed is linked into the kernel structures and must 29 * not be reused until it has been unregistered. A negative errno code 30 * is returned on a failure. 31 */ 32 int register_netevent_notifier(struct notifier_block *nb) 33 { 34 int err; 35 36 err = atomic_notifier_chain_register(&netevent_notif_chain, nb); 37 return err; 38 } 39 EXPORT_SYMBOL_GPL(register_netevent_notifier); 40 41 /** 42 * netevent_unregister_notifier - unregister a netevent notifier block 43 * @nb: notifier 44 * 45 * Unregister a notifier previously registered by 46 * register_neigh_notifier(). The notifier is unlinked into the 47 * kernel structures and may then be reused. A negative errno code 48 * is returned on a failure. 49 */ 50 51 int unregister_netevent_notifier(struct notifier_block *nb) 52 { 53 return atomic_notifier_chain_unregister(&netevent_notif_chain, nb); 54 } 55 EXPORT_SYMBOL_GPL(unregister_netevent_notifier); 56 57 /** 58 * call_netevent_notifiers - call all netevent notifier blocks 59 * @val: value passed unmodified to notifier function 60 * @v: pointer passed unmodified to notifier function 61 * 62 * Call all neighbour notifier blocks. Parameters and return value 63 * are as for notifier_call_chain(). 64 */ 65 66 int call_netevent_notifiers(unsigned long val, void *v) 67 { 68 return atomic_notifier_call_chain(&netevent_notif_chain, val, v); 69 } 70 EXPORT_SYMBOL_GPL(call_netevent_notifiers); 71