2 * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #include "hard-interface.h"
24 #include "soft-interface.h"
26 #include "translation-table.h"
28 #include "bat_sysfs.h"
29 #include "originator.h"
31 #include "bridge_loop_avoidance.h"
33 #include <linux/if_arp.h>
35 void hardif_free_rcu(struct rcu_head *rcu)
37 struct hard_iface *hard_iface;
39 hard_iface = container_of(rcu, struct hard_iface, rcu);
40 dev_put(hard_iface->net_dev);
44 struct hard_iface *hardif_get_by_netdev(const struct net_device *net_dev)
46 struct hard_iface *hard_iface;
49 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
50 if (hard_iface->net_dev == net_dev &&
51 atomic_inc_not_zero(&hard_iface->refcount))
62 static int is_valid_iface(const struct net_device *net_dev)
64 if (net_dev->flags & IFF_LOOPBACK)
67 if (net_dev->type != ARPHRD_ETHER)
70 if (net_dev->addr_len != ETH_ALEN)
73 /* no batman over batman */
74 if (softif_is_valid(net_dev))
77 /* Device is being bridged */
78 /* if (net_dev->priv_flags & IFF_BRIDGE_PORT)
84 static struct hard_iface *hardif_get_active(const struct net_device *soft_iface)
86 struct hard_iface *hard_iface;
89 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
90 if (hard_iface->soft_iface != soft_iface)
93 if (hard_iface->if_status == IF_ACTIVE &&
94 atomic_inc_not_zero(&hard_iface->refcount))
105 static void primary_if_update_addr(struct bat_priv *bat_priv,
106 struct hard_iface *oldif)
108 struct vis_packet *vis_packet;
109 struct hard_iface *primary_if;
111 primary_if = primary_if_get_selected(bat_priv);
115 vis_packet = (struct vis_packet *)
116 bat_priv->my_vis_info->skb_packet->data;
117 memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
118 memcpy(vis_packet->sender_orig,
119 primary_if->net_dev->dev_addr, ETH_ALEN);
121 bla_update_orig_address(bat_priv, primary_if, oldif);
124 hardif_free_ref(primary_if);
127 static void primary_if_select(struct bat_priv *bat_priv,
128 struct hard_iface *new_hard_iface)
130 struct hard_iface *curr_hard_iface;
134 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
135 new_hard_iface = NULL;
137 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
138 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
143 bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
144 primary_if_update_addr(bat_priv, curr_hard_iface);
148 hardif_free_ref(curr_hard_iface);
151 static bool hardif_is_iface_up(const struct hard_iface *hard_iface)
153 if (hard_iface->net_dev->flags & IFF_UP)
159 static void check_known_mac_addr(const struct net_device *net_dev)
161 const struct hard_iface *hard_iface;
164 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
165 if ((hard_iface->if_status != IF_ACTIVE) &&
166 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
169 if (hard_iface->net_dev == net_dev)
172 if (!compare_eth(hard_iface->net_dev->dev_addr,
176 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
177 net_dev->dev_addr, hard_iface->net_dev->name);
178 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
183 int hardif_min_mtu(struct net_device *soft_iface)
185 const struct bat_priv *bat_priv = netdev_priv(soft_iface);
186 const struct hard_iface *hard_iface;
187 /* allow big frames if all devices are capable to do so
188 * (have MTU > 1500 + BAT_HEADER_LEN) */
189 int min_mtu = ETH_DATA_LEN;
191 if (atomic_read(&bat_priv->fragmentation))
195 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
196 if ((hard_iface->if_status != IF_ACTIVE) &&
197 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
200 if (hard_iface->soft_iface != soft_iface)
203 min_mtu = min_t(int, hard_iface->net_dev->mtu - BAT_HEADER_LEN,
211 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
212 void update_min_mtu(struct net_device *soft_iface)
216 min_mtu = hardif_min_mtu(soft_iface);
217 if (soft_iface->mtu != min_mtu)
218 soft_iface->mtu = min_mtu;
221 static void hardif_activate_interface(struct hard_iface *hard_iface)
223 struct bat_priv *bat_priv;
224 struct hard_iface *primary_if = NULL;
226 if (hard_iface->if_status != IF_INACTIVE)
229 bat_priv = netdev_priv(hard_iface->soft_iface);
231 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
232 hard_iface->if_status = IF_TO_BE_ACTIVATED;
235 * the first active interface becomes our primary interface or
236 * the next active interface after the old primary interface was removed
238 primary_if = primary_if_get_selected(bat_priv);
240 primary_if_select(bat_priv, hard_iface);
242 bat_info(hard_iface->soft_iface, "Interface activated: %s\n",
243 hard_iface->net_dev->name);
245 update_min_mtu(hard_iface->soft_iface);
249 hardif_free_ref(primary_if);
252 static void hardif_deactivate_interface(struct hard_iface *hard_iface)
254 if ((hard_iface->if_status != IF_ACTIVE) &&
255 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
258 hard_iface->if_status = IF_INACTIVE;
260 bat_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
261 hard_iface->net_dev->name);
263 update_min_mtu(hard_iface->soft_iface);
266 int hardif_enable_interface(struct hard_iface *hard_iface,
267 const char *iface_name)
269 struct bat_priv *bat_priv;
270 struct net_device *soft_iface;
273 if (hard_iface->if_status != IF_NOT_IN_USE)
276 if (!atomic_inc_not_zero(&hard_iface->refcount))
279 /* hard-interface is part of a bridge */
280 if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT)
281 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",
282 hard_iface->net_dev->name);
284 soft_iface = dev_get_by_name(&init_net, iface_name);
287 soft_iface = softif_create(iface_name);
294 /* dev_get_by_name() increases the reference counter for us */
295 dev_hold(soft_iface);
298 if (!softif_is_valid(soft_iface)) {
299 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
305 hard_iface->soft_iface = soft_iface;
306 bat_priv = netdev_priv(hard_iface->soft_iface);
308 ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
314 hard_iface->if_num = bat_priv->num_ifaces;
315 bat_priv->num_ifaces++;
316 hard_iface->if_status = IF_INACTIVE;
317 orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
319 hard_iface->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN);
320 hard_iface->batman_adv_ptype.func = batman_skb_recv;
321 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
322 dev_add_pack(&hard_iface->batman_adv_ptype);
324 atomic_set(&hard_iface->frag_seqno, 1);
325 bat_info(hard_iface->soft_iface, "Adding interface: %s\n",
326 hard_iface->net_dev->name);
328 if (atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
329 ETH_DATA_LEN + BAT_HEADER_LEN)
330 bat_info(hard_iface->soft_iface,
331 "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",
332 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
333 ETH_DATA_LEN + BAT_HEADER_LEN);
335 if (!atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
336 ETH_DATA_LEN + BAT_HEADER_LEN)
337 bat_info(hard_iface->soft_iface,
338 "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",
339 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
340 ETH_DATA_LEN + BAT_HEADER_LEN);
342 if (hardif_is_iface_up(hard_iface))
343 hardif_activate_interface(hard_iface);
345 bat_err(hard_iface->soft_iface,
346 "Not using interface %s (retrying later): interface not active\n",
347 hard_iface->net_dev->name);
349 /* begin scheduling originator messages on that interface */
350 schedule_bat_ogm(hard_iface);
358 hardif_free_ref(hard_iface);
362 void hardif_disable_interface(struct hard_iface *hard_iface)
364 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
365 struct hard_iface *primary_if = NULL;
367 if (hard_iface->if_status == IF_ACTIVE)
368 hardif_deactivate_interface(hard_iface);
370 if (hard_iface->if_status != IF_INACTIVE)
373 bat_info(hard_iface->soft_iface, "Removing interface: %s\n",
374 hard_iface->net_dev->name);
375 dev_remove_pack(&hard_iface->batman_adv_ptype);
377 bat_priv->num_ifaces--;
378 orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
380 primary_if = primary_if_get_selected(bat_priv);
381 if (hard_iface == primary_if) {
382 struct hard_iface *new_if;
384 new_if = hardif_get_active(hard_iface->soft_iface);
385 primary_if_select(bat_priv, new_if);
388 hardif_free_ref(new_if);
391 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
392 hard_iface->if_status = IF_NOT_IN_USE;
394 /* delete all references to this hard_iface */
395 purge_orig_ref(bat_priv);
396 purge_outstanding_packets(bat_priv, hard_iface);
397 dev_put(hard_iface->soft_iface);
399 /* nobody uses this interface anymore */
400 if (!bat_priv->num_ifaces)
401 softif_destroy(hard_iface->soft_iface);
403 hard_iface->soft_iface = NULL;
404 hardif_free_ref(hard_iface);
408 hardif_free_ref(primary_if);
411 static struct hard_iface *hardif_add_interface(struct net_device *net_dev)
413 struct hard_iface *hard_iface;
418 ret = is_valid_iface(net_dev);
424 hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC);
428 ret = sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
432 hard_iface->if_num = -1;
433 hard_iface->net_dev = net_dev;
434 hard_iface->soft_iface = NULL;
435 hard_iface->if_status = IF_NOT_IN_USE;
436 INIT_LIST_HEAD(&hard_iface->list);
437 /* extra reference for return */
438 atomic_set(&hard_iface->refcount, 2);
440 check_known_mac_addr(hard_iface->net_dev);
441 list_add_tail_rcu(&hard_iface->list, &hardif_list);
444 * This can't be called via a bat_priv callback because
445 * we have no bat_priv yet.
447 atomic_set(&hard_iface->seqno, 1);
448 hard_iface->packet_buff = NULL;
460 static void hardif_remove_interface(struct hard_iface *hard_iface)
464 /* first deactivate interface */
465 if (hard_iface->if_status != IF_NOT_IN_USE)
466 hardif_disable_interface(hard_iface);
468 if (hard_iface->if_status != IF_NOT_IN_USE)
471 hard_iface->if_status = IF_TO_BE_REMOVED;
472 sysfs_del_hardif(&hard_iface->hardif_obj);
473 hardif_free_ref(hard_iface);
476 void hardif_remove_interfaces(void)
478 struct hard_iface *hard_iface, *hard_iface_tmp;
481 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
482 &hardif_list, list) {
483 list_del_rcu(&hard_iface->list);
484 hardif_remove_interface(hard_iface);
489 static int hard_if_event(struct notifier_block *this,
490 unsigned long event, void *ptr)
492 struct net_device *net_dev = ptr;
493 struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
494 struct hard_iface *primary_if = NULL;
495 struct bat_priv *bat_priv;
497 if (!hard_iface && event == NETDEV_REGISTER)
498 hard_iface = hardif_add_interface(net_dev);
505 hardif_activate_interface(hard_iface);
507 case NETDEV_GOING_DOWN:
509 hardif_deactivate_interface(hard_iface);
511 case NETDEV_UNREGISTER:
512 list_del_rcu(&hard_iface->list);
514 hardif_remove_interface(hard_iface);
516 case NETDEV_CHANGEMTU:
517 if (hard_iface->soft_iface)
518 update_min_mtu(hard_iface->soft_iface);
520 case NETDEV_CHANGEADDR:
521 if (hard_iface->if_status == IF_NOT_IN_USE)
524 check_known_mac_addr(hard_iface->net_dev);
526 bat_priv = netdev_priv(hard_iface->soft_iface);
527 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
529 primary_if = primary_if_get_selected(bat_priv);
533 if (hard_iface == primary_if)
534 primary_if_update_addr(bat_priv, NULL);
541 hardif_free_ref(hard_iface);
544 hardif_free_ref(primary_if);
548 /* This function returns true if the interface represented by ifindex is a
549 * 802.11 wireless device */
550 bool is_wifi_iface(int ifindex)
552 struct net_device *net_device = NULL;
555 if (ifindex == NULL_IFINDEX)
558 net_device = dev_get_by_index(&init_net, ifindex);
562 #ifdef CONFIG_WIRELESS_EXT
563 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
564 * check for wireless_handlers != NULL */
565 if (net_device->wireless_handlers)
569 /* cfg80211 drivers have to set ieee80211_ptr */
570 if (net_device->ieee80211_ptr)
578 struct notifier_block hard_if_notifier = {
579 .notifier_call = hard_if_event,