1 /* Copyright (C) 2007-2014 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, see <http://www.gnu.org/licenses/>.
19 #include "distributed-arp-table.h"
20 #include "hard-interface.h"
21 #include "soft-interface.h"
23 #include "translation-table.h"
27 #include "originator.h"
29 #include "bridge_loop_avoidance.h"
30 #include "gateway_client.h"
32 #include <linux/if_arp.h>
33 #include <linux/if_ether.h>
35 void batadv_hardif_free_rcu(struct rcu_head *rcu)
37 struct batadv_hard_iface *hard_iface;
39 hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
40 dev_put(hard_iface->net_dev);
44 struct batadv_hard_iface *
45 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
47 struct batadv_hard_iface *hard_iface;
50 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
51 if (hard_iface->net_dev == net_dev &&
52 atomic_inc_not_zero(&hard_iface->refcount))
64 * batadv_is_on_batman_iface - check if a device is a batman iface descendant
65 * @net_dev: the device to check
67 * If the user creates any virtual device on top of a batman-adv interface, it
68 * is important to prevent this new interface to be used to create a new mesh
69 * network (this behaviour would lead to a batman-over-batman configuration).
70 * This function recursively checks all the fathers of the device passed as
71 * argument looking for a batman-adv soft interface.
73 * Returns true if the device is descendant of a batman-adv mesh interface (or
74 * if it is a batman-adv interface itself), false otherwise
76 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
78 struct net_device *parent_dev;
81 /* check if this is a batman-adv mesh interface */
82 if (batadv_softif_is_valid(net_dev))
85 /* no more parents..stop recursion */
86 if (net_dev->iflink == net_dev->ifindex)
89 /* recurse over the parent device */
90 parent_dev = dev_get_by_index(&init_net, net_dev->iflink);
91 /* if we got a NULL parent_dev there is something broken.. */
92 if (WARN(!parent_dev, "Cannot find parent device"))
95 ret = batadv_is_on_batman_iface(parent_dev);
102 static int batadv_is_valid_iface(const struct net_device *net_dev)
104 if (net_dev->flags & IFF_LOOPBACK)
107 if (net_dev->type != ARPHRD_ETHER)
110 if (net_dev->addr_len != ETH_ALEN)
113 /* no batman over batman */
114 if (batadv_is_on_batman_iface(net_dev))
121 * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
123 * @net_device: the device to check
125 * Returns true if the net device is a 802.11 wireless device, false otherwise.
127 bool batadv_is_wifi_netdev(struct net_device *net_device)
132 #ifdef CONFIG_WIRELESS_EXT
133 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
134 * check for wireless_handlers != NULL
136 if (net_device->wireless_handlers)
140 /* cfg80211 drivers have to set ieee80211_ptr */
141 if (net_device->ieee80211_ptr)
147 static struct batadv_hard_iface *
148 batadv_hardif_get_active(const struct net_device *soft_iface)
150 struct batadv_hard_iface *hard_iface;
153 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
154 if (hard_iface->soft_iface != soft_iface)
157 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
158 atomic_inc_not_zero(&hard_iface->refcount))
169 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
170 struct batadv_hard_iface *oldif)
172 struct batadv_hard_iface *primary_if;
174 primary_if = batadv_primary_if_get_selected(bat_priv);
178 batadv_dat_init_own_addr(bat_priv, primary_if);
179 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
182 batadv_hardif_free_ref(primary_if);
185 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
186 struct batadv_hard_iface *new_hard_iface)
188 struct batadv_hard_iface *curr_hard_iface;
192 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
193 new_hard_iface = NULL;
195 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
196 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
201 bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
202 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
206 batadv_hardif_free_ref(curr_hard_iface);
210 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
212 if (hard_iface->net_dev->flags & IFF_UP)
218 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
220 const struct batadv_hard_iface *hard_iface;
223 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
224 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
225 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
228 if (hard_iface->net_dev == net_dev)
231 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
235 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
236 net_dev->dev_addr, hard_iface->net_dev->name);
237 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
242 int batadv_hardif_min_mtu(struct net_device *soft_iface)
244 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
245 const struct batadv_hard_iface *hard_iface;
246 int min_mtu = ETH_DATA_LEN;
249 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
250 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
251 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
254 if (hard_iface->soft_iface != soft_iface)
257 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
261 atomic_set(&bat_priv->packet_size_max, min_mtu);
263 if (atomic_read(&bat_priv->fragmentation) == 0)
266 /* with fragmentation enabled the maximum size of internally generated
267 * packets such as translation table exchanges or tvlv containers, etc
268 * has to be calculated
270 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
271 min_mtu -= sizeof(struct batadv_frag_packet);
272 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
273 atomic_set(&bat_priv->packet_size_max, min_mtu);
275 /* with fragmentation enabled we can fragment external packets easily */
276 min_mtu = min_t(int, min_mtu, ETH_DATA_LEN);
279 return min_mtu - batadv_max_header_len();
282 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
283 void batadv_update_min_mtu(struct net_device *soft_iface)
285 soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
287 /* Check if the local translate table should be cleaned up to match a
288 * new (and smaller) MTU.
290 batadv_tt_local_resize_to_mtu(soft_iface);
294 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
296 struct batadv_priv *bat_priv;
297 struct batadv_hard_iface *primary_if = NULL;
299 if (hard_iface->if_status != BATADV_IF_INACTIVE)
302 bat_priv = netdev_priv(hard_iface->soft_iface);
304 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
305 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
307 /* the first active interface becomes our primary interface or
308 * the next active interface after the old primary interface was removed
310 primary_if = batadv_primary_if_get_selected(bat_priv);
312 batadv_primary_if_select(bat_priv, hard_iface);
314 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
315 hard_iface->net_dev->name);
317 batadv_update_min_mtu(hard_iface->soft_iface);
321 batadv_hardif_free_ref(primary_if);
325 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
327 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
328 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
331 hard_iface->if_status = BATADV_IF_INACTIVE;
333 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
334 hard_iface->net_dev->name);
336 batadv_update_min_mtu(hard_iface->soft_iface);
340 * batadv_master_del_slave - remove hard_iface from the current master interface
341 * @slave: the interface enslaved in another master
342 * @master: the master from which slave has to be removed
344 * Invoke ndo_del_slave on master passing slave as argument. In this way slave
345 * is free'd and master can correctly change its internal state.
346 * Return 0 on success, a negative value representing the error otherwise
348 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
349 struct net_device *master)
357 if (master->netdev_ops->ndo_del_slave)
358 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
363 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
364 const char *iface_name)
366 struct batadv_priv *bat_priv;
367 struct net_device *soft_iface, *master;
368 __be16 ethertype = htons(ETH_P_BATMAN);
369 int max_header_len = batadv_max_header_len();
372 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
375 if (!atomic_inc_not_zero(&hard_iface->refcount))
378 soft_iface = dev_get_by_name(&init_net, iface_name);
381 soft_iface = batadv_softif_create(iface_name);
388 /* dev_get_by_name() increases the reference counter for us */
389 dev_hold(soft_iface);
392 if (!batadv_softif_is_valid(soft_iface)) {
393 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
399 /* check if the interface is enslaved in another virtual one and
400 * in that case unlink it first
402 master = netdev_master_upper_dev_get(hard_iface->net_dev);
403 ret = batadv_master_del_slave(hard_iface, master);
407 hard_iface->soft_iface = soft_iface;
408 bat_priv = netdev_priv(hard_iface->soft_iface);
410 ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
414 ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
418 hard_iface->if_num = bat_priv->num_ifaces;
419 bat_priv->num_ifaces++;
420 hard_iface->if_status = BATADV_IF_INACTIVE;
421 ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
423 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
424 bat_priv->num_ifaces--;
425 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
429 hard_iface->batman_adv_ptype.type = ethertype;
430 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
431 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
432 dev_add_pack(&hard_iface->batman_adv_ptype);
434 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
435 hard_iface->net_dev->name);
437 if (atomic_read(&bat_priv->fragmentation) &&
438 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
439 batadv_info(hard_iface->soft_iface,
440 "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 %i would solve the problem.\n",
441 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
442 ETH_DATA_LEN + max_header_len);
444 if (!atomic_read(&bat_priv->fragmentation) &&
445 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
446 batadv_info(hard_iface->soft_iface,
447 "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 %i.\n",
448 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
449 ETH_DATA_LEN + max_header_len);
451 if (batadv_hardif_is_iface_up(hard_iface))
452 batadv_hardif_activate_interface(hard_iface);
454 batadv_err(hard_iface->soft_iface,
455 "Not using interface %s (retrying later): interface not active\n",
456 hard_iface->net_dev->name);
458 /* begin scheduling originator messages on that interface */
459 batadv_schedule_bat_ogm(hard_iface);
465 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
467 hard_iface->soft_iface = NULL;
470 batadv_hardif_free_ref(hard_iface);
474 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
475 enum batadv_hard_if_cleanup autodel)
477 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
478 struct batadv_hard_iface *primary_if = NULL;
480 if (hard_iface->if_status == BATADV_IF_ACTIVE)
481 batadv_hardif_deactivate_interface(hard_iface);
483 if (hard_iface->if_status != BATADV_IF_INACTIVE)
486 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
487 hard_iface->net_dev->name);
488 dev_remove_pack(&hard_iface->batman_adv_ptype);
490 bat_priv->num_ifaces--;
491 batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
493 primary_if = batadv_primary_if_get_selected(bat_priv);
494 if (hard_iface == primary_if) {
495 struct batadv_hard_iface *new_if;
497 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
498 batadv_primary_if_select(bat_priv, new_if);
501 batadv_hardif_free_ref(new_if);
504 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
505 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
507 /* delete all references to this hard_iface */
508 batadv_purge_orig_ref(bat_priv);
509 batadv_purge_outstanding_packets(bat_priv, hard_iface);
510 dev_put(hard_iface->soft_iface);
512 /* nobody uses this interface anymore */
513 if (!bat_priv->num_ifaces) {
514 batadv_gw_check_client_stop(bat_priv);
516 if (autodel == BATADV_IF_CLEANUP_AUTO)
517 batadv_softif_destroy_sysfs(hard_iface->soft_iface);
520 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
521 hard_iface->soft_iface = NULL;
522 batadv_hardif_free_ref(hard_iface);
526 batadv_hardif_free_ref(primary_if);
530 * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
531 * @work: work queue item
533 * Free the parts of the hard interface which can not be removed under
534 * rtnl lock (to prevent deadlock situations).
536 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
538 struct batadv_hard_iface *hard_iface;
540 hard_iface = container_of(work, struct batadv_hard_iface,
543 batadv_debugfs_del_hardif(hard_iface);
544 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
545 batadv_hardif_free_ref(hard_iface);
548 static struct batadv_hard_iface *
549 batadv_hardif_add_interface(struct net_device *net_dev)
551 struct batadv_hard_iface *hard_iface;
556 ret = batadv_is_valid_iface(net_dev);
562 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
566 ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
570 hard_iface->if_num = -1;
571 hard_iface->net_dev = net_dev;
572 hard_iface->soft_iface = NULL;
573 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
575 ret = batadv_debugfs_add_hardif(hard_iface);
579 INIT_LIST_HEAD(&hard_iface->list);
580 INIT_WORK(&hard_iface->cleanup_work,
581 batadv_hardif_remove_interface_finish);
583 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
584 if (batadv_is_wifi_netdev(net_dev))
585 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
587 /* extra reference for return */
588 atomic_set(&hard_iface->refcount, 2);
590 batadv_check_known_mac_addr(hard_iface->net_dev);
591 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
596 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
605 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
609 /* first deactivate interface */
610 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
611 batadv_hardif_disable_interface(hard_iface,
612 BATADV_IF_CLEANUP_AUTO);
614 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
617 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
618 queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
621 void batadv_hardif_remove_interfaces(void)
623 struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
626 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
627 &batadv_hardif_list, list) {
628 list_del_rcu(&hard_iface->list);
629 batadv_hardif_remove_interface(hard_iface);
634 static int batadv_hard_if_event(struct notifier_block *this,
635 unsigned long event, void *ptr)
637 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
638 struct batadv_hard_iface *hard_iface;
639 struct batadv_hard_iface *primary_if = NULL;
640 struct batadv_priv *bat_priv;
642 if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
643 batadv_sysfs_add_meshif(net_dev);
644 bat_priv = netdev_priv(net_dev);
645 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
649 hard_iface = batadv_hardif_get_by_netdev(net_dev);
650 if (!hard_iface && event == NETDEV_REGISTER)
651 hard_iface = batadv_hardif_add_interface(net_dev);
658 batadv_hardif_activate_interface(hard_iface);
660 case NETDEV_GOING_DOWN:
662 batadv_hardif_deactivate_interface(hard_iface);
664 case NETDEV_UNREGISTER:
665 list_del_rcu(&hard_iface->list);
667 batadv_hardif_remove_interface(hard_iface);
669 case NETDEV_CHANGEMTU:
670 if (hard_iface->soft_iface)
671 batadv_update_min_mtu(hard_iface->soft_iface);
673 case NETDEV_CHANGEADDR:
674 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
677 batadv_check_known_mac_addr(hard_iface->net_dev);
679 bat_priv = netdev_priv(hard_iface->soft_iface);
680 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
682 primary_if = batadv_primary_if_get_selected(bat_priv);
686 if (hard_iface == primary_if)
687 batadv_primary_if_update_addr(bat_priv, NULL);
694 batadv_hardif_free_ref(hard_iface);
697 batadv_hardif_free_ref(primary_if);
701 struct notifier_block batadv_hard_if_notifier = {
702 .notifier_call = batadv_hard_if_event,