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
))
120 static struct batadv_hard_iface
*
121 batadv_hardif_get_active(const struct net_device
*soft_iface
)
123 struct batadv_hard_iface
*hard_iface
;
126 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
127 if (hard_iface
->soft_iface
!= soft_iface
)
130 if (hard_iface
->if_status
== BATADV_IF_ACTIVE
&&
131 atomic_inc_not_zero(&hard_iface
->refcount
))
142 static void batadv_primary_if_update_addr(struct batadv_priv
*bat_priv
,
143 struct batadv_hard_iface
*oldif
)
145 struct batadv_vis_packet
*vis_packet
;
146 struct batadv_hard_iface
*primary_if
;
149 primary_if
= batadv_primary_if_get_selected(bat_priv
);
153 batadv_dat_init_own_addr(bat_priv
, primary_if
);
155 skb
= bat_priv
->vis
.my_info
->skb_packet
;
156 vis_packet
= (struct batadv_vis_packet
*)skb
->data
;
157 memcpy(vis_packet
->vis_orig
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
158 memcpy(vis_packet
->sender_orig
,
159 primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
161 batadv_bla_update_orig_address(bat_priv
, primary_if
, oldif
);
164 batadv_hardif_free_ref(primary_if
);
167 static void batadv_primary_if_select(struct batadv_priv
*bat_priv
,
168 struct batadv_hard_iface
*new_hard_iface
)
170 struct batadv_hard_iface
*curr_hard_iface
;
174 if (new_hard_iface
&& !atomic_inc_not_zero(&new_hard_iface
->refcount
))
175 new_hard_iface
= NULL
;
177 curr_hard_iface
= rcu_dereference_protected(bat_priv
->primary_if
, 1);
178 rcu_assign_pointer(bat_priv
->primary_if
, new_hard_iface
);
183 bat_priv
->bat_algo_ops
->bat_primary_iface_set(new_hard_iface
);
184 batadv_primary_if_update_addr(bat_priv
, curr_hard_iface
);
188 batadv_hardif_free_ref(curr_hard_iface
);
192 batadv_hardif_is_iface_up(const struct batadv_hard_iface
*hard_iface
)
194 if (hard_iface
->net_dev
->flags
& IFF_UP
)
200 static void batadv_check_known_mac_addr(const struct net_device
*net_dev
)
202 const struct batadv_hard_iface
*hard_iface
;
205 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
206 if ((hard_iface
->if_status
!= BATADV_IF_ACTIVE
) &&
207 (hard_iface
->if_status
!= BATADV_IF_TO_BE_ACTIVATED
))
210 if (hard_iface
->net_dev
== net_dev
)
213 if (!batadv_compare_eth(hard_iface
->net_dev
->dev_addr
,
217 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
218 net_dev
->dev_addr
, hard_iface
->net_dev
->name
);
219 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
224 int batadv_hardif_min_mtu(struct net_device
*soft_iface
)
226 const struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
227 const struct batadv_hard_iface
*hard_iface
;
228 /* allow big frames if all devices are capable to do so
229 * (have MTU > 1500 + BAT_HEADER_LEN)
231 int min_mtu
= ETH_DATA_LEN
;
233 if (atomic_read(&bat_priv
->fragmentation
))
237 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
238 if ((hard_iface
->if_status
!= BATADV_IF_ACTIVE
) &&
239 (hard_iface
->if_status
!= BATADV_IF_TO_BE_ACTIVATED
))
242 if (hard_iface
->soft_iface
!= soft_iface
)
246 hard_iface
->net_dev
->mtu
- BATADV_HEADER_LEN
,
254 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
255 void batadv_update_min_mtu(struct net_device
*soft_iface
)
259 min_mtu
= batadv_hardif_min_mtu(soft_iface
);
260 if (soft_iface
->mtu
!= min_mtu
)
261 soft_iface
->mtu
= min_mtu
;
265 batadv_hardif_activate_interface(struct batadv_hard_iface
*hard_iface
)
267 struct batadv_priv
*bat_priv
;
268 struct batadv_hard_iface
*primary_if
= NULL
;
270 if (hard_iface
->if_status
!= BATADV_IF_INACTIVE
)
273 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
275 bat_priv
->bat_algo_ops
->bat_iface_update_mac(hard_iface
);
276 hard_iface
->if_status
= BATADV_IF_TO_BE_ACTIVATED
;
278 /* the first active interface becomes our primary interface or
279 * the next active interface after the old primary interface was removed
281 primary_if
= batadv_primary_if_get_selected(bat_priv
);
283 batadv_primary_if_select(bat_priv
, hard_iface
);
285 batadv_info(hard_iface
->soft_iface
, "Interface activated: %s\n",
286 hard_iface
->net_dev
->name
);
288 batadv_update_min_mtu(hard_iface
->soft_iface
);
292 batadv_hardif_free_ref(primary_if
);
296 batadv_hardif_deactivate_interface(struct batadv_hard_iface
*hard_iface
)
298 if ((hard_iface
->if_status
!= BATADV_IF_ACTIVE
) &&
299 (hard_iface
->if_status
!= BATADV_IF_TO_BE_ACTIVATED
))
302 hard_iface
->if_status
= BATADV_IF_INACTIVE
;
304 batadv_info(hard_iface
->soft_iface
, "Interface deactivated: %s\n",
305 hard_iface
->net_dev
->name
);
307 batadv_update_min_mtu(hard_iface
->soft_iface
);
311 * batadv_master_del_slave - remove hard_iface from the current master interface
312 * @slave: the interface enslaved in another master
313 * @master: the master from which slave has to be removed
315 * Invoke ndo_del_slave on master passing slave as argument. In this way slave
316 * is free'd and master can correctly change its internal state.
317 * Return 0 on success, a negative value representing the error otherwise
319 static int batadv_master_del_slave(struct batadv_hard_iface
*slave
,
320 struct net_device
*master
)
328 if (master
->netdev_ops
->ndo_del_slave
)
329 ret
= master
->netdev_ops
->ndo_del_slave(master
, slave
->net_dev
);
334 int batadv_hardif_enable_interface(struct batadv_hard_iface
*hard_iface
,
335 const char *iface_name
)
337 struct batadv_priv
*bat_priv
;
338 struct net_device
*soft_iface
, *master
;
339 __be16 ethertype
= __constant_htons(ETH_P_BATMAN
);
342 if (hard_iface
->if_status
!= BATADV_IF_NOT_IN_USE
)
345 if (!atomic_inc_not_zero(&hard_iface
->refcount
))
348 soft_iface
= dev_get_by_name(&init_net
, iface_name
);
351 soft_iface
= batadv_softif_create(iface_name
);
358 /* dev_get_by_name() increases the reference counter for us */
359 dev_hold(soft_iface
);
362 if (!batadv_softif_is_valid(soft_iface
)) {
363 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
369 /* check if the interface is enslaved in another virtual one and
370 * in that case unlink it first
372 master
= netdev_master_upper_dev_get(hard_iface
->net_dev
);
373 ret
= batadv_master_del_slave(hard_iface
, master
);
377 hard_iface
->soft_iface
= soft_iface
;
378 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
380 ret
= netdev_master_upper_dev_link(hard_iface
->net_dev
, soft_iface
);
384 ret
= bat_priv
->bat_algo_ops
->bat_iface_enable(hard_iface
);
388 hard_iface
->if_num
= bat_priv
->num_ifaces
;
389 bat_priv
->num_ifaces
++;
390 hard_iface
->if_status
= BATADV_IF_INACTIVE
;
391 ret
= batadv_orig_hash_add_if(hard_iface
, bat_priv
->num_ifaces
);
393 bat_priv
->bat_algo_ops
->bat_iface_disable(hard_iface
);
394 bat_priv
->num_ifaces
--;
395 hard_iface
->if_status
= BATADV_IF_NOT_IN_USE
;
399 hard_iface
->batman_adv_ptype
.type
= ethertype
;
400 hard_iface
->batman_adv_ptype
.func
= batadv_batman_skb_recv
;
401 hard_iface
->batman_adv_ptype
.dev
= hard_iface
->net_dev
;
402 dev_add_pack(&hard_iface
->batman_adv_ptype
);
404 atomic_set(&hard_iface
->frag_seqno
, 1);
405 batadv_info(hard_iface
->soft_iface
, "Adding interface: %s\n",
406 hard_iface
->net_dev
->name
);
408 if (atomic_read(&bat_priv
->fragmentation
) &&
409 hard_iface
->net_dev
->mtu
< ETH_DATA_LEN
+ BATADV_HEADER_LEN
)
410 batadv_info(hard_iface
->soft_iface
,
411 "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",
412 hard_iface
->net_dev
->name
, hard_iface
->net_dev
->mtu
,
413 ETH_DATA_LEN
+ BATADV_HEADER_LEN
);
415 if (!atomic_read(&bat_priv
->fragmentation
) &&
416 hard_iface
->net_dev
->mtu
< ETH_DATA_LEN
+ BATADV_HEADER_LEN
)
417 batadv_info(hard_iface
->soft_iface
,
418 "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",
419 hard_iface
->net_dev
->name
, hard_iface
->net_dev
->mtu
,
420 ETH_DATA_LEN
+ BATADV_HEADER_LEN
);
422 if (batadv_hardif_is_iface_up(hard_iface
))
423 batadv_hardif_activate_interface(hard_iface
);
425 batadv_err(hard_iface
->soft_iface
,
426 "Not using interface %s (retrying later): interface not active\n",
427 hard_iface
->net_dev
->name
);
429 /* begin scheduling originator messages on that interface */
430 batadv_schedule_bat_ogm(hard_iface
);
436 netdev_upper_dev_unlink(hard_iface
->net_dev
, soft_iface
);
438 hard_iface
->soft_iface
= NULL
;
441 batadv_hardif_free_ref(hard_iface
);
445 void batadv_hardif_disable_interface(struct batadv_hard_iface
*hard_iface
,
446 enum batadv_hard_if_cleanup autodel
)
448 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
449 struct batadv_hard_iface
*primary_if
= NULL
;
451 if (hard_iface
->if_status
== BATADV_IF_ACTIVE
)
452 batadv_hardif_deactivate_interface(hard_iface
);
454 if (hard_iface
->if_status
!= BATADV_IF_INACTIVE
)
457 batadv_info(hard_iface
->soft_iface
, "Removing interface: %s\n",
458 hard_iface
->net_dev
->name
);
459 dev_remove_pack(&hard_iface
->batman_adv_ptype
);
461 bat_priv
->num_ifaces
--;
462 batadv_orig_hash_del_if(hard_iface
, bat_priv
->num_ifaces
);
464 primary_if
= batadv_primary_if_get_selected(bat_priv
);
465 if (hard_iface
== primary_if
) {
466 struct batadv_hard_iface
*new_if
;
468 new_if
= batadv_hardif_get_active(hard_iface
->soft_iface
);
469 batadv_primary_if_select(bat_priv
, new_if
);
472 batadv_hardif_free_ref(new_if
);
475 bat_priv
->bat_algo_ops
->bat_iface_disable(hard_iface
);
476 hard_iface
->if_status
= BATADV_IF_NOT_IN_USE
;
478 /* delete all references to this hard_iface */
479 batadv_purge_orig_ref(bat_priv
);
480 batadv_purge_outstanding_packets(bat_priv
, hard_iface
);
481 dev_put(hard_iface
->soft_iface
);
483 /* nobody uses this interface anymore */
484 if (!bat_priv
->num_ifaces
&& autodel
== BATADV_IF_CLEANUP_AUTO
)
485 batadv_softif_destroy_sysfs(hard_iface
->soft_iface
);
487 netdev_upper_dev_unlink(hard_iface
->net_dev
, hard_iface
->soft_iface
);
488 hard_iface
->soft_iface
= NULL
;
489 batadv_hardif_free_ref(hard_iface
);
493 batadv_hardif_free_ref(primary_if
);
497 * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
498 * @work: work queue item
500 * Free the parts of the hard interface which can not be removed under
501 * rtnl lock (to prevent deadlock situations).
503 static void batadv_hardif_remove_interface_finish(struct work_struct
*work
)
505 struct batadv_hard_iface
*hard_iface
;
507 hard_iface
= container_of(work
, struct batadv_hard_iface
,
510 batadv_sysfs_del_hardif(&hard_iface
->hardif_obj
);
511 batadv_hardif_free_ref(hard_iface
);
514 static struct batadv_hard_iface
*
515 batadv_hardif_add_interface(struct net_device
*net_dev
)
517 struct batadv_hard_iface
*hard_iface
;
522 ret
= batadv_is_valid_iface(net_dev
);
528 hard_iface
= kmalloc(sizeof(*hard_iface
), GFP_ATOMIC
);
532 ret
= batadv_sysfs_add_hardif(&hard_iface
->hardif_obj
, net_dev
);
536 hard_iface
->if_num
= -1;
537 hard_iface
->net_dev
= net_dev
;
538 hard_iface
->soft_iface
= NULL
;
539 hard_iface
->if_status
= BATADV_IF_NOT_IN_USE
;
540 INIT_LIST_HEAD(&hard_iface
->list
);
541 INIT_WORK(&hard_iface
->cleanup_work
,
542 batadv_hardif_remove_interface_finish
);
544 /* extra reference for return */
545 atomic_set(&hard_iface
->refcount
, 2);
547 batadv_check_known_mac_addr(hard_iface
->net_dev
);
548 list_add_tail_rcu(&hard_iface
->list
, &batadv_hardif_list
);
550 /* This can't be called via a bat_priv callback because
551 * we have no bat_priv yet.
553 atomic_set(&hard_iface
->bat_iv
.ogm_seqno
, 1);
554 hard_iface
->bat_iv
.ogm_buff
= NULL
;
566 static void batadv_hardif_remove_interface(struct batadv_hard_iface
*hard_iface
)
570 /* first deactivate interface */
571 if (hard_iface
->if_status
!= BATADV_IF_NOT_IN_USE
)
572 batadv_hardif_disable_interface(hard_iface
,
573 BATADV_IF_CLEANUP_AUTO
);
575 if (hard_iface
->if_status
!= BATADV_IF_NOT_IN_USE
)
578 hard_iface
->if_status
= BATADV_IF_TO_BE_REMOVED
;
579 queue_work(batadv_event_workqueue
, &hard_iface
->cleanup_work
);
582 void batadv_hardif_remove_interfaces(void)
584 struct batadv_hard_iface
*hard_iface
, *hard_iface_tmp
;
587 list_for_each_entry_safe(hard_iface
, hard_iface_tmp
,
588 &batadv_hardif_list
, list
) {
589 list_del_rcu(&hard_iface
->list
);
590 batadv_hardif_remove_interface(hard_iface
);
595 static int batadv_hard_if_event(struct notifier_block
*this,
596 unsigned long event
, void *ptr
)
598 struct net_device
*net_dev
= ptr
;
599 struct batadv_hard_iface
*hard_iface
;
600 struct batadv_hard_iface
*primary_if
= NULL
;
601 struct batadv_priv
*bat_priv
;
603 if (batadv_softif_is_valid(net_dev
) && event
== NETDEV_REGISTER
) {
604 batadv_sysfs_add_meshif(net_dev
);
608 hard_iface
= batadv_hardif_get_by_netdev(net_dev
);
609 if (!hard_iface
&& event
== NETDEV_REGISTER
)
610 hard_iface
= batadv_hardif_add_interface(net_dev
);
617 batadv_hardif_activate_interface(hard_iface
);
619 case NETDEV_GOING_DOWN
:
621 batadv_hardif_deactivate_interface(hard_iface
);
623 case NETDEV_UNREGISTER
:
624 list_del_rcu(&hard_iface
->list
);
626 batadv_hardif_remove_interface(hard_iface
);
628 case NETDEV_CHANGEMTU
:
629 if (hard_iface
->soft_iface
)
630 batadv_update_min_mtu(hard_iface
->soft_iface
);
632 case NETDEV_CHANGEADDR
:
633 if (hard_iface
->if_status
== BATADV_IF_NOT_IN_USE
)
636 batadv_check_known_mac_addr(hard_iface
->net_dev
);
638 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
639 bat_priv
->bat_algo_ops
->bat_iface_update_mac(hard_iface
);
641 primary_if
= batadv_primary_if_get_selected(bat_priv
);
645 if (hard_iface
== primary_if
)
646 batadv_primary_if_update_addr(bat_priv
, NULL
);
653 batadv_hardif_free_ref(hard_iface
);
656 batadv_hardif_free_ref(primary_if
);
660 /* This function returns true if the interface represented by ifindex is a
661 * 802.11 wireless device
663 bool batadv_is_wifi_iface(int ifindex
)
665 struct net_device
*net_device
= NULL
;
668 if (ifindex
== BATADV_NULL_IFINDEX
)
671 net_device
= dev_get_by_index(&init_net
, ifindex
);
675 #ifdef CONFIG_WIRELESS_EXT
676 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
677 * check for wireless_handlers != NULL
679 if (net_device
->wireless_handlers
)
683 /* cfg80211 drivers have to set ieee80211_ptr */
684 if (net_device
->ieee80211_ptr
)
692 struct notifier_block batadv_hard_if_notifier
= {
693 .notifier_call
= batadv_hard_if_event
,