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 17 static 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 */ 28 int register_netevent_notifier(struct notifier_block *nb) 29 { 30 return atomic_notifier_chain_register(&netevent_notif_chain, nb); 31 } 32 EXPORT_SYMBOL_GPL(register_netevent_notifier); 33 34 /** 35 * netevent_unregister_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 44 int unregister_netevent_notifier(struct notifier_block *nb) 45 { 46 return atomic_notifier_chain_unregister(&netevent_notif_chain, nb); 47 } 48 EXPORT_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 59 int call_netevent_notifiers(unsigned long val, void *v) 60 { 61 return atomic_notifier_call_chain(&netevent_notif_chain, val, v); 62 } 63 EXPORT_SYMBOL_GPL(call_netevent_notifiers); 64