1 /* Copyright (C) 2007-2013 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 "distributed-arp-table.h"
22 #include "hard-interface.h"
23 #include "soft-interface.h"
25 #include "translation-table.h"
28 #include "originator.h"
30 #include "bridge_loop_avoidance.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 static bool batadv_is_wifi_netdev(struct net_device *net_device)
129 #ifdef CONFIG_WIRELESS_EXT
130 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
131 * check for wireless_handlers != NULL
133 if (net_device->wireless_handlers)
137 /* cfg80211 drivers have to set ieee80211_ptr */
138 if (net_device->ieee80211_ptr)
145 * batadv_is_wifi_iface - check if the given interface represented by ifindex
146 * is a wifi interface
147 * @ifindex: interface index to check
149 * Returns true if the interface represented by ifindex is a 802.11 wireless
150 * device, false otherwise.
152 bool batadv_is_wifi_iface(int ifindex)
154 struct net_device *net_device = NULL;
157 if (ifindex == BATADV_NULL_IFINDEX)
160 net_device = dev_get_by_index(&init_net, ifindex);
164 ret = batadv_is_wifi_netdev(net_device);
172 static struct batadv_hard_iface *
173 batadv_hardif_get_active(const struct net_device *soft_iface)
175 struct batadv_hard_iface *hard_iface;
178 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
179 if (hard_iface->soft_iface != soft_iface)
182 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
183 atomic_inc_not_zero(&hard_iface->refcount))
194 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
195 struct batadv_hard_iface *oldif)
197 struct batadv_hard_iface *primary_if;
199 primary_if = batadv_primary_if_get_selected(bat_priv);
203 batadv_dat_init_own_addr(bat_priv, primary_if);
204 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
207 batadv_hardif_free_ref(primary_if);
210 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
211 struct batadv_hard_iface *new_hard_iface)
213 struct batadv_hard_iface *curr_hard_iface;
217 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
218 new_hard_iface = NULL;
220 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
221 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
226 bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
227 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
231 batadv_hardif_free_ref(curr_hard_iface);
235 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
237 if (hard_iface->net_dev->flags & IFF_UP)
243 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
245 const struct batadv_hard_iface *hard_iface;
248 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
249 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
250 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
253 if (hard_iface->net_dev == net_dev)
256 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
260 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
261 net_dev->dev_addr, hard_iface->net_dev->name);
262 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
267 int batadv_hardif_min_mtu(struct net_device *soft_iface)
269 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
270 const struct batadv_hard_iface *hard_iface;
271 int min_mtu = ETH_DATA_LEN;
274 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
275 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
276 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
279 if (hard_iface->soft_iface != soft_iface)
282 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
286 atomic_set(&bat_priv->packet_size_max, min_mtu);
288 if (atomic_read(&bat_priv->fragmentation) == 0)
291 /* with fragmentation enabled the maximum size of internally generated
292 * packets such as translation table exchanges or tvlv containers, etc
293 * has to be calculated
295 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
296 min_mtu -= sizeof(struct batadv_frag_packet);
297 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
298 atomic_set(&bat_priv->packet_size_max, min_mtu);
300 /* with fragmentation enabled we can fragment external packets easily */
301 min_mtu = min_t(int, min_mtu, ETH_DATA_LEN);
304 return min_mtu - batadv_max_header_len();
307 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
308 void batadv_update_min_mtu(struct net_device *soft_iface)
310 soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
312 /* Check if the local translate table should be cleaned up to match a
313 * new (and smaller) MTU.
315 batadv_tt_local_resize_to_mtu(soft_iface);
319 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
321 struct batadv_priv *bat_priv;
322 struct batadv_hard_iface *primary_if = NULL;
324 if (hard_iface->if_status != BATADV_IF_INACTIVE)
327 bat_priv = netdev_priv(hard_iface->soft_iface);
329 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
330 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
332 /* the first active interface becomes our primary interface or
333 * the next active interface after the old primary interface was removed
335 primary_if = batadv_primary_if_get_selected(bat_priv);
337 batadv_primary_if_select(bat_priv, hard_iface);
339 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
340 hard_iface->net_dev->name);
342 batadv_update_min_mtu(hard_iface->soft_iface);
346 batadv_hardif_free_ref(primary_if);
350 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
352 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
353 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
356 hard_iface->if_status = BATADV_IF_INACTIVE;
358 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
359 hard_iface->net_dev->name);
361 batadv_update_min_mtu(hard_iface->soft_iface);
365 * batadv_master_del_slave - remove hard_iface from the current master interface
366 * @slave: the interface enslaved in another master
367 * @master: the master from which slave has to be removed
369 * Invoke ndo_del_slave on master passing slave as argument. In this way slave
370 * is free'd and master can correctly change its internal state.
371 * Return 0 on success, a negative value representing the error otherwise
373 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
374 struct net_device *master)
382 if (master->netdev_ops->ndo_del_slave)
383 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
388 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
389 const char *iface_name)
391 struct batadv_priv *bat_priv;
392 struct net_device *soft_iface, *master;
393 __be16 ethertype = htons(ETH_P_BATMAN);
394 int max_header_len = batadv_max_header_len();
397 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
400 if (!atomic_inc_not_zero(&hard_iface->refcount))
403 soft_iface = dev_get_by_name(&init_net, iface_name);
406 soft_iface = batadv_softif_create(iface_name);
413 /* dev_get_by_name() increases the reference counter for us */
414 dev_hold(soft_iface);
417 if (!batadv_softif_is_valid(soft_iface)) {
418 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
424 /* check if the interface is enslaved in another virtual one and
425 * in that case unlink it first
427 master = netdev_master_upper_dev_get(hard_iface->net_dev);
428 ret = batadv_master_del_slave(hard_iface, master);
432 hard_iface->soft_iface = soft_iface;
433 bat_priv = netdev_priv(hard_iface->soft_iface);
435 ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
439 ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
443 hard_iface->if_num = bat_priv->num_ifaces;
444 bat_priv->num_ifaces++;
445 hard_iface->if_status = BATADV_IF_INACTIVE;
446 ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
448 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
449 bat_priv->num_ifaces--;
450 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
454 hard_iface->batman_adv_ptype.type = ethertype;
455 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
456 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
457 dev_add_pack(&hard_iface->batman_adv_ptype);
459 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
460 hard_iface->net_dev->name);
462 if (atomic_read(&bat_priv->fragmentation) &&
463 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
464 batadv_info(hard_iface->soft_iface,
465 "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",
466 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
467 ETH_DATA_LEN + max_header_len);
469 if (!atomic_read(&bat_priv->fragmentation) &&
470 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
471 batadv_info(hard_iface->soft_iface,
472 "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",
473 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
474 ETH_DATA_LEN + max_header_len);
476 if (batadv_hardif_is_iface_up(hard_iface))
477 batadv_hardif_activate_interface(hard_iface);
479 batadv_err(hard_iface->soft_iface,
480 "Not using interface %s (retrying later): interface not active\n",
481 hard_iface->net_dev->name);
483 /* begin scheduling originator messages on that interface */
484 batadv_schedule_bat_ogm(hard_iface);
490 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
492 hard_iface->soft_iface = NULL;
495 batadv_hardif_free_ref(hard_iface);
499 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
500 enum batadv_hard_if_cleanup autodel)
502 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
503 struct batadv_hard_iface *primary_if = NULL;
505 if (hard_iface->if_status == BATADV_IF_ACTIVE)
506 batadv_hardif_deactivate_interface(hard_iface);
508 if (hard_iface->if_status != BATADV_IF_INACTIVE)
511 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
512 hard_iface->net_dev->name);
513 dev_remove_pack(&hard_iface->batman_adv_ptype);
515 bat_priv->num_ifaces--;
516 batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
518 primary_if = batadv_primary_if_get_selected(bat_priv);
519 if (hard_iface == primary_if) {
520 struct batadv_hard_iface *new_if;
522 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
523 batadv_primary_if_select(bat_priv, new_if);
526 batadv_hardif_free_ref(new_if);
529 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
530 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
532 /* delete all references to this hard_iface */
533 batadv_purge_orig_ref(bat_priv);
534 batadv_purge_outstanding_packets(bat_priv, hard_iface);
535 dev_put(hard_iface->soft_iface);
537 /* nobody uses this interface anymore */
538 if (!bat_priv->num_ifaces && autodel == BATADV_IF_CLEANUP_AUTO)
539 batadv_softif_destroy_sysfs(hard_iface->soft_iface);
541 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
542 hard_iface->soft_iface = NULL;
543 batadv_hardif_free_ref(hard_iface);
547 batadv_hardif_free_ref(primary_if);
551 * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
552 * @work: work queue item
554 * Free the parts of the hard interface which can not be removed under
555 * rtnl lock (to prevent deadlock situations).
557 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
559 struct batadv_hard_iface *hard_iface;
561 hard_iface = container_of(work, struct batadv_hard_iface,
564 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
565 batadv_hardif_free_ref(hard_iface);
568 static struct batadv_hard_iface *
569 batadv_hardif_add_interface(struct net_device *net_dev)
571 struct batadv_hard_iface *hard_iface;
576 ret = batadv_is_valid_iface(net_dev);
582 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
586 ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
590 hard_iface->if_num = -1;
591 hard_iface->net_dev = net_dev;
592 hard_iface->soft_iface = NULL;
593 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
594 INIT_LIST_HEAD(&hard_iface->list);
595 INIT_WORK(&hard_iface->cleanup_work,
596 batadv_hardif_remove_interface_finish);
598 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
599 if (batadv_is_wifi_netdev(net_dev))
600 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
602 /* extra reference for return */
603 atomic_set(&hard_iface->refcount, 2);
605 batadv_check_known_mac_addr(hard_iface->net_dev);
606 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
618 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
622 /* first deactivate interface */
623 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
624 batadv_hardif_disable_interface(hard_iface,
625 BATADV_IF_CLEANUP_AUTO);
627 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
630 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
631 queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
634 void batadv_hardif_remove_interfaces(void)
636 struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
639 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
640 &batadv_hardif_list, list) {
641 list_del_rcu(&hard_iface->list);
642 batadv_hardif_remove_interface(hard_iface);
647 static int batadv_hard_if_event(struct notifier_block *this,
648 unsigned long event, void *ptr)
650 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
651 struct batadv_hard_iface *hard_iface;
652 struct batadv_hard_iface *primary_if = NULL;
653 struct batadv_priv *bat_priv;
655 if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
656 batadv_sysfs_add_meshif(net_dev);
657 bat_priv = netdev_priv(net_dev);
658 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
662 hard_iface = batadv_hardif_get_by_netdev(net_dev);
663 if (!hard_iface && event == NETDEV_REGISTER)
664 hard_iface = batadv_hardif_add_interface(net_dev);
671 batadv_hardif_activate_interface(hard_iface);
673 case NETDEV_GOING_DOWN:
675 batadv_hardif_deactivate_interface(hard_iface);
677 case NETDEV_UNREGISTER:
678 list_del_rcu(&hard_iface->list);
680 batadv_hardif_remove_interface(hard_iface);
682 case NETDEV_CHANGEMTU:
683 if (hard_iface->soft_iface)
684 batadv_update_min_mtu(hard_iface->soft_iface);
686 case NETDEV_CHANGEADDR:
687 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
690 batadv_check_known_mac_addr(hard_iface->net_dev);
692 bat_priv = netdev_priv(hard_iface->soft_iface);
693 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
695 primary_if = batadv_primary_if_get_selected(bat_priv);
699 if (hard_iface == primary_if)
700 batadv_primary_if_update_addr(bat_priv, NULL);
707 batadv_hardif_free_ref(hard_iface);
710 batadv_hardif_free_ref(primary_if);
714 struct notifier_block batadv_hard_if_notifier = {
715 .notifier_call = batadv_hard_if_event,