1 /* Copyright (C) 2007-2012 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 "hard-interface.h"
22 #include "soft-interface.h"
24 #include "translation-table.h"
27 #include "originator.h"
29 #include "bridge_loop_avoidance.h"
31 #include <linux/if_arp.h>
33 void batadv_hardif_free_rcu(struct rcu_head
*rcu
)
35 struct batadv_hard_iface
*hard_iface
;
37 hard_iface
= container_of(rcu
, struct batadv_hard_iface
, rcu
);
38 dev_put(hard_iface
->net_dev
);
42 struct batadv_hard_iface
*
43 batadv_hardif_get_by_netdev(const struct net_device
*net_dev
)
45 struct batadv_hard_iface
*hard_iface
;
48 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
49 if (hard_iface
->net_dev
== net_dev
&&
50 atomic_inc_not_zero(&hard_iface
->refcount
))
61 static int batadv_is_valid_iface(const struct net_device
*net_dev
)
63 if (net_dev
->flags
& IFF_LOOPBACK
)
66 if (net_dev
->type
!= ARPHRD_ETHER
)
69 if (net_dev
->addr_len
!= ETH_ALEN
)
72 /* no batman over batman */
73 if (batadv_softif_is_valid(net_dev
))
79 static struct batadv_hard_iface
*
80 batadv_hardif_get_active(const struct net_device
*soft_iface
)
82 struct batadv_hard_iface
*hard_iface
;
85 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
86 if (hard_iface
->soft_iface
!= soft_iface
)
89 if (hard_iface
->if_status
== BATADV_IF_ACTIVE
&&
90 atomic_inc_not_zero(&hard_iface
->refcount
))
101 static void batadv_primary_if_update_addr(struct batadv_priv
*bat_priv
,
102 struct batadv_hard_iface
*oldif
)
104 struct batadv_vis_packet
*vis_packet
;
105 struct batadv_hard_iface
*primary_if
;
107 primary_if
= batadv_primary_if_get_selected(bat_priv
);
111 vis_packet
= (struct batadv_vis_packet
*)
112 bat_priv
->my_vis_info
->skb_packet
->data
;
113 memcpy(vis_packet
->vis_orig
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
114 memcpy(vis_packet
->sender_orig
,
115 primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
117 batadv_bla_update_orig_address(bat_priv
, primary_if
, oldif
);
120 batadv_hardif_free_ref(primary_if
);
123 static void batadv_primary_if_select(struct batadv_priv
*bat_priv
,
124 struct batadv_hard_iface
*new_hard_iface
)
126 struct batadv_hard_iface
*curr_hard_iface
;
130 if (new_hard_iface
&& !atomic_inc_not_zero(&new_hard_iface
->refcount
))
131 new_hard_iface
= NULL
;
133 curr_hard_iface
= rcu_dereference_protected(bat_priv
->primary_if
, 1);
134 rcu_assign_pointer(bat_priv
->primary_if
, new_hard_iface
);
139 bat_priv
->bat_algo_ops
->bat_primary_iface_set(new_hard_iface
);
140 batadv_primary_if_update_addr(bat_priv
, curr_hard_iface
);
144 batadv_hardif_free_ref(curr_hard_iface
);
148 batadv_hardif_is_iface_up(const struct batadv_hard_iface
*hard_iface
)
150 if (hard_iface
->net_dev
->flags
& IFF_UP
)
156 static void batadv_check_known_mac_addr(const struct net_device
*net_dev
)
158 const struct batadv_hard_iface
*hard_iface
;
161 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
162 if ((hard_iface
->if_status
!= BATADV_IF_ACTIVE
) &&
163 (hard_iface
->if_status
!= BATADV_IF_TO_BE_ACTIVATED
))
166 if (hard_iface
->net_dev
== net_dev
)
169 if (!batadv_compare_eth(hard_iface
->net_dev
->dev_addr
,
173 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
174 net_dev
->dev_addr
, hard_iface
->net_dev
->name
);
175 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
180 int batadv_hardif_min_mtu(struct net_device
*soft_iface
)
182 const struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
183 const struct batadv_hard_iface
*hard_iface
;
184 /* allow big frames if all devices are capable to do so
185 * (have MTU > 1500 + BAT_HEADER_LEN)
187 int min_mtu
= ETH_DATA_LEN
;
189 if (atomic_read(&bat_priv
->fragmentation
))
193 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
194 if ((hard_iface
->if_status
!= BATADV_IF_ACTIVE
) &&
195 (hard_iface
->if_status
!= BATADV_IF_TO_BE_ACTIVATED
))
198 if (hard_iface
->soft_iface
!= soft_iface
)
202 hard_iface
->net_dev
->mtu
- BATADV_HEADER_LEN
,
210 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
211 void batadv_update_min_mtu(struct net_device
*soft_iface
)
215 min_mtu
= batadv_hardif_min_mtu(soft_iface
);
216 if (soft_iface
->mtu
!= min_mtu
)
217 soft_iface
->mtu
= min_mtu
;
221 batadv_hardif_activate_interface(struct batadv_hard_iface
*hard_iface
)
223 struct batadv_priv
*bat_priv
;
224 struct batadv_hard_iface
*primary_if
= NULL
;
226 if (hard_iface
->if_status
!= BATADV_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
= BATADV_IF_TO_BE_ACTIVATED
;
234 /* the first active interface becomes our primary interface or
235 * the next active interface after the old primary interface was removed
237 primary_if
= batadv_primary_if_get_selected(bat_priv
);
239 batadv_primary_if_select(bat_priv
, hard_iface
);
241 batadv_info(hard_iface
->soft_iface
, "Interface activated: %s\n",
242 hard_iface
->net_dev
->name
);
244 batadv_update_min_mtu(hard_iface
->soft_iface
);
248 batadv_hardif_free_ref(primary_if
);
252 batadv_hardif_deactivate_interface(struct batadv_hard_iface
*hard_iface
)
254 if ((hard_iface
->if_status
!= BATADV_IF_ACTIVE
) &&
255 (hard_iface
->if_status
!= BATADV_IF_TO_BE_ACTIVATED
))
258 hard_iface
->if_status
= BATADV_IF_INACTIVE
;
260 batadv_info(hard_iface
->soft_iface
, "Interface deactivated: %s\n",
261 hard_iface
->net_dev
->name
);
263 batadv_update_min_mtu(hard_iface
->soft_iface
);
266 int batadv_hardif_enable_interface(struct batadv_hard_iface
*hard_iface
,
267 const char *iface_name
)
269 struct batadv_priv
*bat_priv
;
270 struct net_device
*soft_iface
;
271 __be16 ethertype
= __constant_htons(BATADV_ETH_P_BATMAN
);
274 if (hard_iface
->if_status
!= BATADV_IF_NOT_IN_USE
)
277 if (!atomic_inc_not_zero(&hard_iface
->refcount
))
280 /* hard-interface is part of a bridge */
281 if (hard_iface
->net_dev
->priv_flags
& IFF_BRIDGE_PORT
)
282 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",
283 hard_iface
->net_dev
->name
);
285 soft_iface
= dev_get_by_name(&init_net
, iface_name
);
288 soft_iface
= batadv_softif_create(iface_name
);
295 /* dev_get_by_name() increases the reference counter for us */
296 dev_hold(soft_iface
);
299 if (!batadv_softif_is_valid(soft_iface
)) {
300 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
306 hard_iface
->soft_iface
= soft_iface
;
307 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
309 ret
= bat_priv
->bat_algo_ops
->bat_iface_enable(hard_iface
);
313 hard_iface
->if_num
= bat_priv
->num_ifaces
;
314 bat_priv
->num_ifaces
++;
315 hard_iface
->if_status
= BATADV_IF_INACTIVE
;
316 batadv_orig_hash_add_if(hard_iface
, bat_priv
->num_ifaces
);
318 hard_iface
->batman_adv_ptype
.type
= ethertype
;
319 hard_iface
->batman_adv_ptype
.func
= batadv_batman_skb_recv
;
320 hard_iface
->batman_adv_ptype
.dev
= hard_iface
->net_dev
;
321 dev_add_pack(&hard_iface
->batman_adv_ptype
);
323 atomic_set(&hard_iface
->frag_seqno
, 1);
324 batadv_info(hard_iface
->soft_iface
, "Adding interface: %s\n",
325 hard_iface
->net_dev
->name
);
327 if (atomic_read(&bat_priv
->fragmentation
) &&
328 hard_iface
->net_dev
->mtu
< ETH_DATA_LEN
+ BATADV_HEADER_LEN
)
329 batadv_info(hard_iface
->soft_iface
,
330 "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",
331 hard_iface
->net_dev
->name
, hard_iface
->net_dev
->mtu
,
332 ETH_DATA_LEN
+ BATADV_HEADER_LEN
);
334 if (!atomic_read(&bat_priv
->fragmentation
) &&
335 hard_iface
->net_dev
->mtu
< ETH_DATA_LEN
+ BATADV_HEADER_LEN
)
336 batadv_info(hard_iface
->soft_iface
,
337 "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",
338 hard_iface
->net_dev
->name
, hard_iface
->net_dev
->mtu
,
339 ETH_DATA_LEN
+ BATADV_HEADER_LEN
);
341 if (batadv_hardif_is_iface_up(hard_iface
))
342 batadv_hardif_activate_interface(hard_iface
);
344 batadv_err(hard_iface
->soft_iface
,
345 "Not using interface %s (retrying later): interface not active\n",
346 hard_iface
->net_dev
->name
);
348 /* begin scheduling originator messages on that interface */
349 batadv_schedule_bat_ogm(hard_iface
);
357 batadv_hardif_free_ref(hard_iface
);
361 void batadv_hardif_disable_interface(struct batadv_hard_iface
*hard_iface
)
363 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
364 struct batadv_hard_iface
*primary_if
= NULL
;
366 if (hard_iface
->if_status
== BATADV_IF_ACTIVE
)
367 batadv_hardif_deactivate_interface(hard_iface
);
369 if (hard_iface
->if_status
!= BATADV_IF_INACTIVE
)
372 batadv_info(hard_iface
->soft_iface
, "Removing interface: %s\n",
373 hard_iface
->net_dev
->name
);
374 dev_remove_pack(&hard_iface
->batman_adv_ptype
);
376 bat_priv
->num_ifaces
--;
377 batadv_orig_hash_del_if(hard_iface
, bat_priv
->num_ifaces
);
379 primary_if
= batadv_primary_if_get_selected(bat_priv
);
380 if (hard_iface
== primary_if
) {
381 struct batadv_hard_iface
*new_if
;
383 new_if
= batadv_hardif_get_active(hard_iface
->soft_iface
);
384 batadv_primary_if_select(bat_priv
, new_if
);
387 batadv_hardif_free_ref(new_if
);
390 bat_priv
->bat_algo_ops
->bat_iface_disable(hard_iface
);
391 hard_iface
->if_status
= BATADV_IF_NOT_IN_USE
;
393 /* delete all references to this hard_iface */
394 batadv_purge_orig_ref(bat_priv
);
395 batadv_purge_outstanding_packets(bat_priv
, hard_iface
);
396 dev_put(hard_iface
->soft_iface
);
398 /* nobody uses this interface anymore */
399 if (!bat_priv
->num_ifaces
)
400 batadv_softif_destroy(hard_iface
->soft_iface
);
402 hard_iface
->soft_iface
= NULL
;
403 batadv_hardif_free_ref(hard_iface
);
407 batadv_hardif_free_ref(primary_if
);
410 static struct batadv_hard_iface
*
411 batadv_hardif_add_interface(struct net_device
*net_dev
)
413 struct batadv_hard_iface
*hard_iface
;
418 ret
= batadv_is_valid_iface(net_dev
);
424 hard_iface
= kmalloc(sizeof(*hard_iface
), GFP_ATOMIC
);
428 ret
= batadv_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
= BATADV_IF_NOT_IN_USE
;
436 INIT_LIST_HEAD(&hard_iface
->list
);
437 /* extra reference for return */
438 atomic_set(&hard_iface
->refcount
, 2);
440 batadv_check_known_mac_addr(hard_iface
->net_dev
);
441 list_add_tail_rcu(&hard_iface
->list
, &batadv_hardif_list
);
443 /* This can't be called via a bat_priv callback because
444 * we have no bat_priv yet.
446 atomic_set(&hard_iface
->seqno
, 1);
447 hard_iface
->packet_buff
= NULL
;
459 static void batadv_hardif_remove_interface(struct batadv_hard_iface
*hard_iface
)
463 /* first deactivate interface */
464 if (hard_iface
->if_status
!= BATADV_IF_NOT_IN_USE
)
465 batadv_hardif_disable_interface(hard_iface
);
467 if (hard_iface
->if_status
!= BATADV_IF_NOT_IN_USE
)
470 hard_iface
->if_status
= BATADV_IF_TO_BE_REMOVED
;
471 batadv_sysfs_del_hardif(&hard_iface
->hardif_obj
);
472 batadv_hardif_free_ref(hard_iface
);
475 void batadv_hardif_remove_interfaces(void)
477 struct batadv_hard_iface
*hard_iface
, *hard_iface_tmp
;
480 list_for_each_entry_safe(hard_iface
, hard_iface_tmp
,
481 &batadv_hardif_list
, list
) {
482 list_del_rcu(&hard_iface
->list
);
483 batadv_hardif_remove_interface(hard_iface
);
488 static int batadv_hard_if_event(struct notifier_block
*this,
489 unsigned long event
, void *ptr
)
491 struct net_device
*net_dev
= ptr
;
492 struct batadv_hard_iface
*hard_iface
;
493 struct batadv_hard_iface
*primary_if
= NULL
;
494 struct batadv_priv
*bat_priv
;
496 hard_iface
= batadv_hardif_get_by_netdev(net_dev
);
497 if (!hard_iface
&& event
== NETDEV_REGISTER
)
498 hard_iface
= batadv_hardif_add_interface(net_dev
);
505 batadv_hardif_activate_interface(hard_iface
);
507 case NETDEV_GOING_DOWN
:
509 batadv_hardif_deactivate_interface(hard_iface
);
511 case NETDEV_UNREGISTER
:
512 list_del_rcu(&hard_iface
->list
);
514 batadv_hardif_remove_interface(hard_iface
);
516 case NETDEV_CHANGEMTU
:
517 if (hard_iface
->soft_iface
)
518 batadv_update_min_mtu(hard_iface
->soft_iface
);
520 case NETDEV_CHANGEADDR
:
521 if (hard_iface
->if_status
== BATADV_IF_NOT_IN_USE
)
524 batadv_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
= batadv_primary_if_get_selected(bat_priv
);
533 if (hard_iface
== primary_if
)
534 batadv_primary_if_update_addr(bat_priv
, NULL
);
541 batadv_hardif_free_ref(hard_iface
);
544 batadv_hardif_free_ref(primary_if
);
548 /* This function returns true if the interface represented by ifindex is a
549 * 802.11 wireless device
551 bool batadv_is_wifi_iface(int ifindex
)
553 struct net_device
*net_device
= NULL
;
556 if (ifindex
== BATADV_NULL_IFINDEX
)
559 net_device
= dev_get_by_index(&init_net
, ifindex
);
563 #ifdef CONFIG_WIRELESS_EXT
564 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
565 * check for wireless_handlers != NULL
567 if (net_device
->wireless_handlers
)
571 /* cfg80211 drivers have to set ieee80211_ptr */
572 if (net_device
->ieee80211_ptr
)
580 struct notifier_block batadv_hard_if_notifier
= {
581 .notifier_call
= batadv_hard_if_event
,