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, 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"
26 #include "originator.h"
28 #include "bridge_loop_avoidance.h"
29 #include "gateway_client.h"
31 #include <linux/if_arp.h>
32 #include <linux/if_ether.h>
34 void batadv_hardif_free_rcu(struct rcu_head *rcu)
36 struct batadv_hard_iface *hard_iface;
38 hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
39 dev_put(hard_iface->net_dev);
43 struct batadv_hard_iface *
44 batadv_hardif_get_by_netdev(const struct net_device *net_dev)
46 struct batadv_hard_iface *hard_iface;
49 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
50 if (hard_iface->net_dev == net_dev &&
51 atomic_inc_not_zero(&hard_iface->refcount))
63 * batadv_is_on_batman_iface - check if a device is a batman iface descendant
64 * @net_dev: the device to check
66 * If the user creates any virtual device on top of a batman-adv interface, it
67 * is important to prevent this new interface to be used to create a new mesh
68 * network (this behaviour would lead to a batman-over-batman configuration).
69 * This function recursively checks all the fathers of the device passed as
70 * argument looking for a batman-adv soft interface.
72 * Returns true if the device is descendant of a batman-adv mesh interface (or
73 * if it is a batman-adv interface itself), false otherwise
75 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
77 struct net_device *parent_dev;
80 /* check if this is a batman-adv mesh interface */
81 if (batadv_softif_is_valid(net_dev))
84 /* no more parents..stop recursion */
85 if (net_dev->iflink == net_dev->ifindex)
88 /* recurse over the parent device */
89 parent_dev = dev_get_by_index(&init_net, net_dev->iflink);
90 /* if we got a NULL parent_dev there is something broken.. */
91 if (WARN(!parent_dev, "Cannot find parent device"))
94 ret = batadv_is_on_batman_iface(parent_dev);
101 static int batadv_is_valid_iface(const struct net_device *net_dev)
103 if (net_dev->flags & IFF_LOOPBACK)
106 if (net_dev->type != ARPHRD_ETHER)
109 if (net_dev->addr_len != ETH_ALEN)
112 /* no batman over batman */
113 if (batadv_is_on_batman_iface(net_dev))
120 * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
122 * @net_device: the device to check
124 * Returns true if the net device is a 802.11 wireless device, false otherwise.
126 bool batadv_is_wifi_netdev(struct net_device *net_device)
131 #ifdef CONFIG_WIRELESS_EXT
132 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
133 * check for wireless_handlers != NULL
135 if (net_device->wireless_handlers)
139 /* cfg80211 drivers have to set ieee80211_ptr */
140 if (net_device->ieee80211_ptr)
146 static struct batadv_hard_iface *
147 batadv_hardif_get_active(const struct net_device *soft_iface)
149 struct batadv_hard_iface *hard_iface;
152 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
153 if (hard_iface->soft_iface != soft_iface)
156 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
157 atomic_inc_not_zero(&hard_iface->refcount))
168 static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
169 struct batadv_hard_iface *oldif)
171 struct batadv_hard_iface *primary_if;
173 primary_if = batadv_primary_if_get_selected(bat_priv);
177 batadv_dat_init_own_addr(bat_priv, primary_if);
178 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
181 batadv_hardif_free_ref(primary_if);
184 static void batadv_primary_if_select(struct batadv_priv *bat_priv,
185 struct batadv_hard_iface *new_hard_iface)
187 struct batadv_hard_iface *curr_hard_iface;
191 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
192 new_hard_iface = NULL;
194 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
195 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
200 bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
201 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
205 batadv_hardif_free_ref(curr_hard_iface);
209 batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
211 if (hard_iface->net_dev->flags & IFF_UP)
217 static void batadv_check_known_mac_addr(const struct net_device *net_dev)
219 const struct batadv_hard_iface *hard_iface;
222 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
223 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
224 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
227 if (hard_iface->net_dev == net_dev)
230 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
234 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
235 net_dev->dev_addr, hard_iface->net_dev->name);
236 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
241 int batadv_hardif_min_mtu(struct net_device *soft_iface)
243 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
244 const struct batadv_hard_iface *hard_iface;
245 int min_mtu = ETH_DATA_LEN;
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->soft_iface != soft_iface)
256 min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
260 atomic_set(&bat_priv->packet_size_max, min_mtu);
262 if (atomic_read(&bat_priv->fragmentation) == 0)
265 /* with fragmentation enabled the maximum size of internally generated
266 * packets such as translation table exchanges or tvlv containers, etc
267 * has to be calculated
269 min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
270 min_mtu -= sizeof(struct batadv_frag_packet);
271 min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
272 atomic_set(&bat_priv->packet_size_max, min_mtu);
274 /* with fragmentation enabled we can fragment external packets easily */
275 min_mtu = min_t(int, min_mtu, ETH_DATA_LEN);
278 return min_mtu - batadv_max_header_len();
281 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
282 void batadv_update_min_mtu(struct net_device *soft_iface)
284 soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
286 /* Check if the local translate table should be cleaned up to match a
287 * new (and smaller) MTU.
289 batadv_tt_local_resize_to_mtu(soft_iface);
293 batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
295 struct batadv_priv *bat_priv;
296 struct batadv_hard_iface *primary_if = NULL;
298 if (hard_iface->if_status != BATADV_IF_INACTIVE)
301 bat_priv = netdev_priv(hard_iface->soft_iface);
303 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
304 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
306 /* the first active interface becomes our primary interface or
307 * the next active interface after the old primary interface was removed
309 primary_if = batadv_primary_if_get_selected(bat_priv);
311 batadv_primary_if_select(bat_priv, hard_iface);
313 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
314 hard_iface->net_dev->name);
316 batadv_update_min_mtu(hard_iface->soft_iface);
320 batadv_hardif_free_ref(primary_if);
324 batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
326 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
327 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
330 hard_iface->if_status = BATADV_IF_INACTIVE;
332 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
333 hard_iface->net_dev->name);
335 batadv_update_min_mtu(hard_iface->soft_iface);
339 * batadv_master_del_slave - remove hard_iface from the current master interface
340 * @slave: the interface enslaved in another master
341 * @master: the master from which slave has to be removed
343 * Invoke ndo_del_slave on master passing slave as argument. In this way slave
344 * is free'd and master can correctly change its internal state.
345 * Return 0 on success, a negative value representing the error otherwise
347 static int batadv_master_del_slave(struct batadv_hard_iface *slave,
348 struct net_device *master)
356 if (master->netdev_ops->ndo_del_slave)
357 ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
362 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
363 const char *iface_name)
365 struct batadv_priv *bat_priv;
366 struct net_device *soft_iface, *master;
367 __be16 ethertype = htons(ETH_P_BATMAN);
368 int max_header_len = batadv_max_header_len();
371 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
374 if (!atomic_inc_not_zero(&hard_iface->refcount))
377 soft_iface = dev_get_by_name(&init_net, iface_name);
380 soft_iface = batadv_softif_create(iface_name);
387 /* dev_get_by_name() increases the reference counter for us */
388 dev_hold(soft_iface);
391 if (!batadv_softif_is_valid(soft_iface)) {
392 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
398 /* check if the interface is enslaved in another virtual one and
399 * in that case unlink it first
401 master = netdev_master_upper_dev_get(hard_iface->net_dev);
402 ret = batadv_master_del_slave(hard_iface, master);
406 hard_iface->soft_iface = soft_iface;
407 bat_priv = netdev_priv(hard_iface->soft_iface);
409 ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
413 ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
417 hard_iface->if_num = bat_priv->num_ifaces;
418 bat_priv->num_ifaces++;
419 hard_iface->if_status = BATADV_IF_INACTIVE;
420 ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
422 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
423 bat_priv->num_ifaces--;
424 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
428 hard_iface->batman_adv_ptype.type = ethertype;
429 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
430 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
431 dev_add_pack(&hard_iface->batman_adv_ptype);
433 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
434 hard_iface->net_dev->name);
436 if (atomic_read(&bat_priv->fragmentation) &&
437 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
438 batadv_info(hard_iface->soft_iface,
439 "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",
440 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
441 ETH_DATA_LEN + max_header_len);
443 if (!atomic_read(&bat_priv->fragmentation) &&
444 hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
445 batadv_info(hard_iface->soft_iface,
446 "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",
447 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
448 ETH_DATA_LEN + max_header_len);
450 if (batadv_hardif_is_iface_up(hard_iface))
451 batadv_hardif_activate_interface(hard_iface);
453 batadv_err(hard_iface->soft_iface,
454 "Not using interface %s (retrying later): interface not active\n",
455 hard_iface->net_dev->name);
457 /* begin scheduling originator messages on that interface */
458 batadv_schedule_bat_ogm(hard_iface);
464 netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
466 hard_iface->soft_iface = NULL;
469 batadv_hardif_free_ref(hard_iface);
473 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
474 enum batadv_hard_if_cleanup autodel)
476 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
477 struct batadv_hard_iface *primary_if = NULL;
479 if (hard_iface->if_status == BATADV_IF_ACTIVE)
480 batadv_hardif_deactivate_interface(hard_iface);
482 if (hard_iface->if_status != BATADV_IF_INACTIVE)
485 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
486 hard_iface->net_dev->name);
487 dev_remove_pack(&hard_iface->batman_adv_ptype);
489 bat_priv->num_ifaces--;
490 batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
492 primary_if = batadv_primary_if_get_selected(bat_priv);
493 if (hard_iface == primary_if) {
494 struct batadv_hard_iface *new_if;
496 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
497 batadv_primary_if_select(bat_priv, new_if);
500 batadv_hardif_free_ref(new_if);
503 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
504 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
506 /* delete all references to this hard_iface */
507 batadv_purge_orig_ref(bat_priv);
508 batadv_purge_outstanding_packets(bat_priv, hard_iface);
509 dev_put(hard_iface->soft_iface);
511 /* nobody uses this interface anymore */
512 if (!bat_priv->num_ifaces) {
513 batadv_gw_check_client_stop(bat_priv);
515 if (autodel == BATADV_IF_CLEANUP_AUTO)
516 batadv_softif_destroy_sysfs(hard_iface->soft_iface);
519 netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
520 hard_iface->soft_iface = NULL;
521 batadv_hardif_free_ref(hard_iface);
525 batadv_hardif_free_ref(primary_if);
529 * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
530 * @work: work queue item
532 * Free the parts of the hard interface which can not be removed under
533 * rtnl lock (to prevent deadlock situations).
535 static void batadv_hardif_remove_interface_finish(struct work_struct *work)
537 struct batadv_hard_iface *hard_iface;
539 hard_iface = container_of(work, struct batadv_hard_iface,
542 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
543 batadv_hardif_free_ref(hard_iface);
546 static struct batadv_hard_iface *
547 batadv_hardif_add_interface(struct net_device *net_dev)
549 struct batadv_hard_iface *hard_iface;
554 ret = batadv_is_valid_iface(net_dev);
560 hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
564 ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
568 hard_iface->if_num = -1;
569 hard_iface->net_dev = net_dev;
570 hard_iface->soft_iface = NULL;
571 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
572 INIT_LIST_HEAD(&hard_iface->list);
573 INIT_WORK(&hard_iface->cleanup_work,
574 batadv_hardif_remove_interface_finish);
576 hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
577 if (batadv_is_wifi_netdev(net_dev))
578 hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
580 /* extra reference for return */
581 atomic_set(&hard_iface->refcount, 2);
583 batadv_check_known_mac_addr(hard_iface->net_dev);
584 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
596 static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
600 /* first deactivate interface */
601 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
602 batadv_hardif_disable_interface(hard_iface,
603 BATADV_IF_CLEANUP_AUTO);
605 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
608 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
609 queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
612 void batadv_hardif_remove_interfaces(void)
614 struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
617 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
618 &batadv_hardif_list, list) {
619 list_del_rcu(&hard_iface->list);
620 batadv_hardif_remove_interface(hard_iface);
625 static int batadv_hard_if_event(struct notifier_block *this,
626 unsigned long event, void *ptr)
628 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
629 struct batadv_hard_iface *hard_iface;
630 struct batadv_hard_iface *primary_if = NULL;
631 struct batadv_priv *bat_priv;
633 if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
634 batadv_sysfs_add_meshif(net_dev);
635 bat_priv = netdev_priv(net_dev);
636 batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
640 hard_iface = batadv_hardif_get_by_netdev(net_dev);
641 if (!hard_iface && event == NETDEV_REGISTER)
642 hard_iface = batadv_hardif_add_interface(net_dev);
649 batadv_hardif_activate_interface(hard_iface);
651 case NETDEV_GOING_DOWN:
653 batadv_hardif_deactivate_interface(hard_iface);
655 case NETDEV_UNREGISTER:
656 list_del_rcu(&hard_iface->list);
658 batadv_hardif_remove_interface(hard_iface);
660 case NETDEV_CHANGEMTU:
661 if (hard_iface->soft_iface)
662 batadv_update_min_mtu(hard_iface->soft_iface);
664 case NETDEV_CHANGEADDR:
665 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
668 batadv_check_known_mac_addr(hard_iface->net_dev);
670 bat_priv = netdev_priv(hard_iface->soft_iface);
671 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
673 primary_if = batadv_primary_if_get_selected(bat_priv);
677 if (hard_iface == primary_if)
678 batadv_primary_if_update_addr(bat_priv, NULL);
685 batadv_hardif_free_ref(hard_iface);
688 batadv_hardif_free_ref(primary_if);
692 struct notifier_block batadv_hard_if_notifier = {
693 .notifier_call = batadv_hard_if_event,