1 /* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: 2 * 3 * Marek Lindner, Simon Wunderlich 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of version 2 of the GNU General Public 7 * License as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_ 19 #define _NET_BATMAN_ADV_HARD_INTERFACE_H_ 20 21 #include "main.h" 22 23 #include <linux/atomic.h> 24 #include <linux/compiler.h> 25 #include <linux/notifier.h> 26 #include <linux/rcupdate.h> 27 #include <linux/stddef.h> 28 #include <linux/types.h> 29 30 struct net_device; 31 32 enum batadv_hard_if_state { 33 BATADV_IF_NOT_IN_USE, 34 BATADV_IF_TO_BE_REMOVED, 35 BATADV_IF_INACTIVE, 36 BATADV_IF_ACTIVE, 37 BATADV_IF_TO_BE_ACTIVATED, 38 BATADV_IF_I_WANT_YOU, 39 }; 40 41 /** 42 * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal 43 * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface 44 * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed 45 */ 46 enum batadv_hard_if_cleanup { 47 BATADV_IF_CLEANUP_KEEP, 48 BATADV_IF_CLEANUP_AUTO, 49 }; 50 51 extern struct notifier_block batadv_hard_if_notifier; 52 53 bool batadv_is_wifi_netdev(struct net_device *net_device); 54 bool batadv_is_wifi_iface(int ifindex); 55 struct batadv_hard_iface* 56 batadv_hardif_get_by_netdev(const struct net_device *net_dev); 57 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, 58 const char *iface_name); 59 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, 60 enum batadv_hard_if_cleanup autodel); 61 void batadv_hardif_remove_interfaces(void); 62 int batadv_hardif_min_mtu(struct net_device *soft_iface); 63 void batadv_update_min_mtu(struct net_device *soft_iface); 64 void batadv_hardif_free_rcu(struct rcu_head *rcu); 65 66 /** 67 * batadv_hardif_free_ref - decrement the hard interface refcounter and 68 * possibly free it 69 * @hard_iface: the hard interface to free 70 */ 71 static inline void 72 batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface) 73 { 74 if (atomic_dec_and_test(&hard_iface->refcount)) 75 call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu); 76 } 77 78 /** 79 * batadv_hardif_free_ref_now - decrement the hard interface refcounter and 80 * possibly free it (without rcu callback) 81 * @hard_iface: the hard interface to free 82 */ 83 static inline void 84 batadv_hardif_free_ref_now(struct batadv_hard_iface *hard_iface) 85 { 86 if (atomic_dec_and_test(&hard_iface->refcount)) 87 batadv_hardif_free_rcu(&hard_iface->rcu); 88 } 89 90 static inline struct batadv_hard_iface * 91 batadv_primary_if_get_selected(struct batadv_priv *bat_priv) 92 { 93 struct batadv_hard_iface *hard_iface; 94 95 rcu_read_lock(); 96 hard_iface = rcu_dereference(bat_priv->primary_if); 97 if (!hard_iface) 98 goto out; 99 100 if (!atomic_inc_not_zero(&hard_iface->refcount)) 101 hard_iface = NULL; 102 103 out: 104 rcu_read_unlock(); 105 return hard_iface; 106 } 107 108 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */ 109