1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich
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.
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.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include "hard-interface.h"
22 #include "soft-interface.h"
24 #include "translation-table.h"
26 #include "bat_sysfs.h"
27 #include "originator.h"
29 #include "bridge_loop_avoidance.h"
31 #include <linux/if_arp.h>
33 void batadv_hardif_free_rcu(struct rcu_head *rcu)
35 struct hard_iface *hard_iface;
37 hard_iface = container_of(rcu, struct hard_iface, rcu);
38 dev_put(hard_iface->net_dev);
42 struct hard_iface *batadv_hardif_get_by_netdev(const struct net_device *net_dev)
44 struct hard_iface *hard_iface;
47 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
48 if (hard_iface->net_dev == net_dev &&
49 atomic_inc_not_zero(&hard_iface->refcount))
60 static int is_valid_iface(const struct net_device *net_dev)
62 if (net_dev->flags & IFF_LOOPBACK)
65 if (net_dev->type != ARPHRD_ETHER)
68 if (net_dev->addr_len != ETH_ALEN)
71 /* no batman over batman */
72 if (batadv_softif_is_valid(net_dev))
78 static struct hard_iface *hardif_get_active(const struct net_device *soft_iface)
80 struct hard_iface *hard_iface;
83 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
84 if (hard_iface->soft_iface != soft_iface)
87 if (hard_iface->if_status == IF_ACTIVE &&
88 atomic_inc_not_zero(&hard_iface->refcount))
99 static void primary_if_update_addr(struct bat_priv *bat_priv,
100 struct hard_iface *oldif)
102 struct vis_packet *vis_packet;
103 struct hard_iface *primary_if;
105 primary_if = primary_if_get_selected(bat_priv);
109 vis_packet = (struct vis_packet *)
110 bat_priv->my_vis_info->skb_packet->data;
111 memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
112 memcpy(vis_packet->sender_orig,
113 primary_if->net_dev->dev_addr, ETH_ALEN);
115 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
118 hardif_free_ref(primary_if);
121 static void primary_if_select(struct bat_priv *bat_priv,
122 struct hard_iface *new_hard_iface)
124 struct hard_iface *curr_hard_iface;
128 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
129 new_hard_iface = NULL;
131 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
132 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
137 bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
138 primary_if_update_addr(bat_priv, curr_hard_iface);
142 hardif_free_ref(curr_hard_iface);
145 static bool hardif_is_iface_up(const struct hard_iface *hard_iface)
147 if (hard_iface->net_dev->flags & IFF_UP)
153 static void check_known_mac_addr(const struct net_device *net_dev)
155 const struct hard_iface *hard_iface;
158 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
159 if ((hard_iface->if_status != IF_ACTIVE) &&
160 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
163 if (hard_iface->net_dev == net_dev)
166 if (!compare_eth(hard_iface->net_dev->dev_addr,
170 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
171 net_dev->dev_addr, hard_iface->net_dev->name);
172 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
177 int batadv_hardif_min_mtu(struct net_device *soft_iface)
179 const struct bat_priv *bat_priv = netdev_priv(soft_iface);
180 const struct hard_iface *hard_iface;
181 /* allow big frames if all devices are capable to do so
182 * (have MTU > 1500 + BAT_HEADER_LEN)
184 int min_mtu = ETH_DATA_LEN;
186 if (atomic_read(&bat_priv->fragmentation))
190 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
191 if ((hard_iface->if_status != IF_ACTIVE) &&
192 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
195 if (hard_iface->soft_iface != soft_iface)
198 min_mtu = min_t(int, hard_iface->net_dev->mtu - BAT_HEADER_LEN,
206 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
207 void batadv_update_min_mtu(struct net_device *soft_iface)
211 min_mtu = batadv_hardif_min_mtu(soft_iface);
212 if (soft_iface->mtu != min_mtu)
213 soft_iface->mtu = min_mtu;
216 static void hardif_activate_interface(struct hard_iface *hard_iface)
218 struct bat_priv *bat_priv;
219 struct hard_iface *primary_if = NULL;
221 if (hard_iface->if_status != IF_INACTIVE)
224 bat_priv = netdev_priv(hard_iface->soft_iface);
226 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
227 hard_iface->if_status = IF_TO_BE_ACTIVATED;
229 /* the first active interface becomes our primary interface or
230 * the next active interface after the old primary interface was removed
232 primary_if = primary_if_get_selected(bat_priv);
234 primary_if_select(bat_priv, hard_iface);
236 bat_info(hard_iface->soft_iface, "Interface activated: %s\n",
237 hard_iface->net_dev->name);
239 batadv_update_min_mtu(hard_iface->soft_iface);
243 hardif_free_ref(primary_if);
246 static void hardif_deactivate_interface(struct hard_iface *hard_iface)
248 if ((hard_iface->if_status != IF_ACTIVE) &&
249 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
252 hard_iface->if_status = IF_INACTIVE;
254 bat_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
255 hard_iface->net_dev->name);
257 batadv_update_min_mtu(hard_iface->soft_iface);
260 int batadv_hardif_enable_interface(struct hard_iface *hard_iface,
261 const char *iface_name)
263 struct bat_priv *bat_priv;
264 struct net_device *soft_iface;
267 if (hard_iface->if_status != IF_NOT_IN_USE)
270 if (!atomic_inc_not_zero(&hard_iface->refcount))
273 /* hard-interface is part of a bridge */
274 if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT)
275 pr_err("You are about to enable batman-adv on '%s' which already is part of a bridge. Unless you know exactly what you are doing this is probably wrong and won't work the way you think it would.\n",
276 hard_iface->net_dev->name);
278 soft_iface = dev_get_by_name(&init_net, iface_name);
281 soft_iface = batadv_softif_create(iface_name);
288 /* dev_get_by_name() increases the reference counter for us */
289 dev_hold(soft_iface);
292 if (!batadv_softif_is_valid(soft_iface)) {
293 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
299 hard_iface->soft_iface = soft_iface;
300 bat_priv = netdev_priv(hard_iface->soft_iface);
302 ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
306 hard_iface->if_num = bat_priv->num_ifaces;
307 bat_priv->num_ifaces++;
308 hard_iface->if_status = IF_INACTIVE;
309 batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
311 hard_iface->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN);
312 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
313 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
314 dev_add_pack(&hard_iface->batman_adv_ptype);
316 atomic_set(&hard_iface->frag_seqno, 1);
317 bat_info(hard_iface->soft_iface, "Adding interface: %s\n",
318 hard_iface->net_dev->name);
320 if (atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
321 ETH_DATA_LEN + BAT_HEADER_LEN)
322 bat_info(hard_iface->soft_iface,
323 "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %zi would solve the problem.\n",
324 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
325 ETH_DATA_LEN + BAT_HEADER_LEN);
327 if (!atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
328 ETH_DATA_LEN + BAT_HEADER_LEN)
329 bat_info(hard_iface->soft_iface,
330 "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %zi.\n",
331 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
332 ETH_DATA_LEN + BAT_HEADER_LEN);
334 if (hardif_is_iface_up(hard_iface))
335 hardif_activate_interface(hard_iface);
337 bat_err(hard_iface->soft_iface,
338 "Not using interface %s (retrying later): interface not active\n",
339 hard_iface->net_dev->name);
341 /* begin scheduling originator messages on that interface */
342 batadv_schedule_bat_ogm(hard_iface);
350 hardif_free_ref(hard_iface);
354 void batadv_hardif_disable_interface(struct hard_iface *hard_iface)
356 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
357 struct hard_iface *primary_if = NULL;
359 if (hard_iface->if_status == IF_ACTIVE)
360 hardif_deactivate_interface(hard_iface);
362 if (hard_iface->if_status != IF_INACTIVE)
365 bat_info(hard_iface->soft_iface, "Removing interface: %s\n",
366 hard_iface->net_dev->name);
367 dev_remove_pack(&hard_iface->batman_adv_ptype);
369 bat_priv->num_ifaces--;
370 batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
372 primary_if = primary_if_get_selected(bat_priv);
373 if (hard_iface == primary_if) {
374 struct hard_iface *new_if;
376 new_if = hardif_get_active(hard_iface->soft_iface);
377 primary_if_select(bat_priv, new_if);
380 hardif_free_ref(new_if);
383 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
384 hard_iface->if_status = IF_NOT_IN_USE;
386 /* delete all references to this hard_iface */
387 batadv_purge_orig_ref(bat_priv);
388 batadv_purge_outstanding_packets(bat_priv, hard_iface);
389 dev_put(hard_iface->soft_iface);
391 /* nobody uses this interface anymore */
392 if (!bat_priv->num_ifaces)
393 batadv_softif_destroy(hard_iface->soft_iface);
395 hard_iface->soft_iface = NULL;
396 hardif_free_ref(hard_iface);
400 hardif_free_ref(primary_if);
403 static struct hard_iface *hardif_add_interface(struct net_device *net_dev)
405 struct hard_iface *hard_iface;
410 ret = is_valid_iface(net_dev);
416 hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC);
420 ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
424 hard_iface->if_num = -1;
425 hard_iface->net_dev = net_dev;
426 hard_iface->soft_iface = NULL;
427 hard_iface->if_status = IF_NOT_IN_USE;
428 INIT_LIST_HEAD(&hard_iface->list);
429 /* extra reference for return */
430 atomic_set(&hard_iface->refcount, 2);
432 check_known_mac_addr(hard_iface->net_dev);
433 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
435 /* This can't be called via a bat_priv callback because
436 * we have no bat_priv yet.
438 atomic_set(&hard_iface->seqno, 1);
439 hard_iface->packet_buff = NULL;
451 static void hardif_remove_interface(struct hard_iface *hard_iface)
455 /* first deactivate interface */
456 if (hard_iface->if_status != IF_NOT_IN_USE)
457 batadv_hardif_disable_interface(hard_iface);
459 if (hard_iface->if_status != IF_NOT_IN_USE)
462 hard_iface->if_status = IF_TO_BE_REMOVED;
463 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
464 hardif_free_ref(hard_iface);
467 void batadv_hardif_remove_interfaces(void)
469 struct hard_iface *hard_iface, *hard_iface_tmp;
472 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
473 &batadv_hardif_list, list) {
474 list_del_rcu(&hard_iface->list);
475 hardif_remove_interface(hard_iface);
480 static int hard_if_event(struct notifier_block *this,
481 unsigned long event, void *ptr)
483 struct net_device *net_dev = ptr;
484 struct hard_iface *hard_iface = batadv_hardif_get_by_netdev(net_dev);
485 struct hard_iface *primary_if = NULL;
486 struct bat_priv *bat_priv;
488 if (!hard_iface && event == NETDEV_REGISTER)
489 hard_iface = hardif_add_interface(net_dev);
496 hardif_activate_interface(hard_iface);
498 case NETDEV_GOING_DOWN:
500 hardif_deactivate_interface(hard_iface);
502 case NETDEV_UNREGISTER:
503 list_del_rcu(&hard_iface->list);
505 hardif_remove_interface(hard_iface);
507 case NETDEV_CHANGEMTU:
508 if (hard_iface->soft_iface)
509 batadv_update_min_mtu(hard_iface->soft_iface);
511 case NETDEV_CHANGEADDR:
512 if (hard_iface->if_status == IF_NOT_IN_USE)
515 check_known_mac_addr(hard_iface->net_dev);
517 bat_priv = netdev_priv(hard_iface->soft_iface);
518 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
520 primary_if = primary_if_get_selected(bat_priv);
524 if (hard_iface == primary_if)
525 primary_if_update_addr(bat_priv, NULL);
532 hardif_free_ref(hard_iface);
535 hardif_free_ref(primary_if);
539 /* This function returns true if the interface represented by ifindex is a
540 * 802.11 wireless device
542 bool batadv_is_wifi_iface(int ifindex)
544 struct net_device *net_device = NULL;
547 if (ifindex == NULL_IFINDEX)
550 net_device = dev_get_by_index(&init_net, ifindex);
554 #ifdef CONFIG_WIRELESS_EXT
555 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
556 * check for wireless_handlers != NULL
558 if (net_device->wireless_handlers)
562 /* cfg80211 drivers have to set ieee80211_ptr */
563 if (net_device->ieee80211_ptr)
571 struct notifier_block batadv_hard_if_notifier = {
572 .notifier_call = hard_if_event,