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
;
108 primary_if
= batadv_primary_if_get_selected(bat_priv
);
112 skb
= bat_priv
->vis
.my_info
->skb_packet
;
113 vis_packet
= (struct batadv_vis_packet
*)skb
->data
;
114 memcpy(vis_packet
->vis_orig
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
115 memcpy(vis_packet
->sender_orig
,
116 primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
118 batadv_bla_update_orig_address(bat_priv
, primary_if
, oldif
);
121 batadv_hardif_free_ref(primary_if
);
124 static void batadv_primary_if_select(struct batadv_priv
*bat_priv
,
125 struct batadv_hard_iface
*new_hard_iface
)
127 struct batadv_hard_iface
*curr_hard_iface
;
131 if (new_hard_iface
&& !atomic_inc_not_zero(&new_hard_iface
->refcount
))
132 new_hard_iface
= NULL
;
134 curr_hard_iface
= rcu_dereference_protected(bat_priv
->primary_if
, 1);
135 rcu_assign_pointer(bat_priv
->primary_if
, new_hard_iface
);
140 bat_priv
->bat_algo_ops
->bat_primary_iface_set(new_hard_iface
);
141 batadv_primary_if_update_addr(bat_priv
, curr_hard_iface
);
145 batadv_hardif_free_ref(curr_hard_iface
);
149 batadv_hardif_is_iface_up(const struct batadv_hard_iface
*hard_iface
)
151 if (hard_iface
->net_dev
->flags
& IFF_UP
)
157 static void batadv_check_known_mac_addr(const struct net_device
*net_dev
)
159 const struct batadv_hard_iface
*hard_iface
;
162 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
163 if ((hard_iface
->if_status
!= BATADV_IF_ACTIVE
) &&
164 (hard_iface
->if_status
!= BATADV_IF_TO_BE_ACTIVATED
))
167 if (hard_iface
->net_dev
== net_dev
)
170 if (!batadv_compare_eth(hard_iface
->net_dev
->dev_addr
,
174 pr_warn("The newly added mac address (%pM) already exists on: %s\n",
175 net_dev
->dev_addr
, hard_iface
->net_dev
->name
);
176 pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
181 int batadv_hardif_min_mtu(struct net_device
*soft_iface
)
183 const struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
184 const struct batadv_hard_iface
*hard_iface
;
185 /* allow big frames if all devices are capable to do so
186 * (have MTU > 1500 + BAT_HEADER_LEN)
188 int min_mtu
= ETH_DATA_LEN
;
190 if (atomic_read(&bat_priv
->fragmentation
))
194 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
195 if ((hard_iface
->if_status
!= BATADV_IF_ACTIVE
) &&
196 (hard_iface
->if_status
!= BATADV_IF_TO_BE_ACTIVATED
))
199 if (hard_iface
->soft_iface
!= soft_iface
)
203 hard_iface
->net_dev
->mtu
- BATADV_HEADER_LEN
,
211 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
212 void batadv_update_min_mtu(struct net_device
*soft_iface
)
216 min_mtu
= batadv_hardif_min_mtu(soft_iface
);
217 if (soft_iface
->mtu
!= min_mtu
)
218 soft_iface
->mtu
= min_mtu
;
222 batadv_hardif_activate_interface(struct batadv_hard_iface
*hard_iface
)
224 struct batadv_priv
*bat_priv
;
225 struct batadv_hard_iface
*primary_if
= NULL
;
227 if (hard_iface
->if_status
!= BATADV_IF_INACTIVE
)
230 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
232 bat_priv
->bat_algo_ops
->bat_iface_update_mac(hard_iface
);
233 hard_iface
->if_status
= BATADV_IF_TO_BE_ACTIVATED
;
235 /* the first active interface becomes our primary interface or
236 * the next active interface after the old primary interface was removed
238 primary_if
= batadv_primary_if_get_selected(bat_priv
);
240 batadv_primary_if_select(bat_priv
, hard_iface
);
242 batadv_info(hard_iface
->soft_iface
, "Interface activated: %s\n",
243 hard_iface
->net_dev
->name
);
245 batadv_update_min_mtu(hard_iface
->soft_iface
);
249 batadv_hardif_free_ref(primary_if
);
253 batadv_hardif_deactivate_interface(struct batadv_hard_iface
*hard_iface
)
255 if ((hard_iface
->if_status
!= BATADV_IF_ACTIVE
) &&
256 (hard_iface
->if_status
!= BATADV_IF_TO_BE_ACTIVATED
))
259 hard_iface
->if_status
= BATADV_IF_INACTIVE
;
261 batadv_info(hard_iface
->soft_iface
, "Interface deactivated: %s\n",
262 hard_iface
->net_dev
->name
);
264 batadv_update_min_mtu(hard_iface
->soft_iface
);
267 int batadv_hardif_enable_interface(struct batadv_hard_iface
*hard_iface
,
268 const char *iface_name
)
270 struct batadv_priv
*bat_priv
;
271 struct net_device
*soft_iface
;
272 __be16 ethertype
= __constant_htons(BATADV_ETH_P_BATMAN
);
275 if (hard_iface
->if_status
!= BATADV_IF_NOT_IN_USE
)
278 if (!atomic_inc_not_zero(&hard_iface
->refcount
))
281 /* hard-interface is part of a bridge */
282 if (hard_iface
->net_dev
->priv_flags
& IFF_BRIDGE_PORT
)
283 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",
284 hard_iface
->net_dev
->name
);
286 soft_iface
= dev_get_by_name(&init_net
, iface_name
);
289 soft_iface
= batadv_softif_create(iface_name
);
296 /* dev_get_by_name() increases the reference counter for us */
297 dev_hold(soft_iface
);
300 if (!batadv_softif_is_valid(soft_iface
)) {
301 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
307 hard_iface
->soft_iface
= soft_iface
;
308 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
310 ret
= bat_priv
->bat_algo_ops
->bat_iface_enable(hard_iface
);
314 hard_iface
->if_num
= bat_priv
->num_ifaces
;
315 bat_priv
->num_ifaces
++;
316 hard_iface
->if_status
= BATADV_IF_INACTIVE
;
317 ret
= batadv_orig_hash_add_if(hard_iface
, bat_priv
->num_ifaces
);
319 bat_priv
->bat_algo_ops
->bat_iface_disable(hard_iface
);
320 bat_priv
->num_ifaces
--;
321 hard_iface
->if_status
= BATADV_IF_NOT_IN_USE
;
325 hard_iface
->batman_adv_ptype
.type
= ethertype
;
326 hard_iface
->batman_adv_ptype
.func
= batadv_batman_skb_recv
;
327 hard_iface
->batman_adv_ptype
.dev
= hard_iface
->net_dev
;
328 dev_add_pack(&hard_iface
->batman_adv_ptype
);
330 atomic_set(&hard_iface
->frag_seqno
, 1);
331 batadv_info(hard_iface
->soft_iface
, "Adding interface: %s\n",
332 hard_iface
->net_dev
->name
);
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. 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",
338 hard_iface
->net_dev
->name
, hard_iface
->net_dev
->mtu
,
339 ETH_DATA_LEN
+ BATADV_HEADER_LEN
);
341 if (!atomic_read(&bat_priv
->fragmentation
) &&
342 hard_iface
->net_dev
->mtu
< ETH_DATA_LEN
+ BATADV_HEADER_LEN
)
343 batadv_info(hard_iface
->soft_iface
,
344 "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",
345 hard_iface
->net_dev
->name
, hard_iface
->net_dev
->mtu
,
346 ETH_DATA_LEN
+ BATADV_HEADER_LEN
);
348 if (batadv_hardif_is_iface_up(hard_iface
))
349 batadv_hardif_activate_interface(hard_iface
);
351 batadv_err(hard_iface
->soft_iface
,
352 "Not using interface %s (retrying later): interface not active\n",
353 hard_iface
->net_dev
->name
);
355 /* begin scheduling originator messages on that interface */
356 batadv_schedule_bat_ogm(hard_iface
);
364 batadv_hardif_free_ref(hard_iface
);
368 void batadv_hardif_disable_interface(struct batadv_hard_iface
*hard_iface
)
370 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
371 struct batadv_hard_iface
*primary_if
= NULL
;
373 if (hard_iface
->if_status
== BATADV_IF_ACTIVE
)
374 batadv_hardif_deactivate_interface(hard_iface
);
376 if (hard_iface
->if_status
!= BATADV_IF_INACTIVE
)
379 batadv_info(hard_iface
->soft_iface
, "Removing interface: %s\n",
380 hard_iface
->net_dev
->name
);
381 dev_remove_pack(&hard_iface
->batman_adv_ptype
);
383 bat_priv
->num_ifaces
--;
384 batadv_orig_hash_del_if(hard_iface
, bat_priv
->num_ifaces
);
386 primary_if
= batadv_primary_if_get_selected(bat_priv
);
387 if (hard_iface
== primary_if
) {
388 struct batadv_hard_iface
*new_if
;
390 new_if
= batadv_hardif_get_active(hard_iface
->soft_iface
);
391 batadv_primary_if_select(bat_priv
, new_if
);
394 batadv_hardif_free_ref(new_if
);
397 bat_priv
->bat_algo_ops
->bat_iface_disable(hard_iface
);
398 hard_iface
->if_status
= BATADV_IF_NOT_IN_USE
;
400 /* delete all references to this hard_iface */
401 batadv_purge_orig_ref(bat_priv
);
402 batadv_purge_outstanding_packets(bat_priv
, hard_iface
);
403 dev_put(hard_iface
->soft_iface
);
405 /* nobody uses this interface anymore */
406 if (!bat_priv
->num_ifaces
)
407 batadv_softif_destroy(hard_iface
->soft_iface
);
409 hard_iface
->soft_iface
= NULL
;
410 batadv_hardif_free_ref(hard_iface
);
414 batadv_hardif_free_ref(primary_if
);
417 static struct batadv_hard_iface
*
418 batadv_hardif_add_interface(struct net_device
*net_dev
)
420 struct batadv_hard_iface
*hard_iface
;
425 ret
= batadv_is_valid_iface(net_dev
);
431 hard_iface
= kmalloc(sizeof(*hard_iface
), GFP_ATOMIC
);
435 ret
= batadv_sysfs_add_hardif(&hard_iface
->hardif_obj
, net_dev
);
439 hard_iface
->if_num
= -1;
440 hard_iface
->net_dev
= net_dev
;
441 hard_iface
->soft_iface
= NULL
;
442 hard_iface
->if_status
= BATADV_IF_NOT_IN_USE
;
443 INIT_LIST_HEAD(&hard_iface
->list
);
444 /* extra reference for return */
445 atomic_set(&hard_iface
->refcount
, 2);
447 batadv_check_known_mac_addr(hard_iface
->net_dev
);
448 list_add_tail_rcu(&hard_iface
->list
, &batadv_hardif_list
);
450 /* This can't be called via a bat_priv callback because
451 * we have no bat_priv yet.
453 atomic_set(&hard_iface
->seqno
, 1);
454 hard_iface
->packet_buff
= NULL
;
466 static void batadv_hardif_remove_interface(struct batadv_hard_iface
*hard_iface
)
470 /* first deactivate interface */
471 if (hard_iface
->if_status
!= BATADV_IF_NOT_IN_USE
)
472 batadv_hardif_disable_interface(hard_iface
);
474 if (hard_iface
->if_status
!= BATADV_IF_NOT_IN_USE
)
477 hard_iface
->if_status
= BATADV_IF_TO_BE_REMOVED
;
478 batadv_sysfs_del_hardif(&hard_iface
->hardif_obj
);
479 batadv_hardif_free_ref(hard_iface
);
482 void batadv_hardif_remove_interfaces(void)
484 struct batadv_hard_iface
*hard_iface
, *hard_iface_tmp
;
487 list_for_each_entry_safe(hard_iface
, hard_iface_tmp
,
488 &batadv_hardif_list
, list
) {
489 list_del_rcu(&hard_iface
->list
);
490 batadv_hardif_remove_interface(hard_iface
);
495 static int batadv_hard_if_event(struct notifier_block
*this,
496 unsigned long event
, void *ptr
)
498 struct net_device
*net_dev
= ptr
;
499 struct batadv_hard_iface
*hard_iface
;
500 struct batadv_hard_iface
*primary_if
= NULL
;
501 struct batadv_priv
*bat_priv
;
503 hard_iface
= batadv_hardif_get_by_netdev(net_dev
);
504 if (!hard_iface
&& event
== NETDEV_REGISTER
)
505 hard_iface
= batadv_hardif_add_interface(net_dev
);
512 batadv_hardif_activate_interface(hard_iface
);
514 case NETDEV_GOING_DOWN
:
516 batadv_hardif_deactivate_interface(hard_iface
);
518 case NETDEV_UNREGISTER
:
519 list_del_rcu(&hard_iface
->list
);
521 batadv_hardif_remove_interface(hard_iface
);
523 case NETDEV_CHANGEMTU
:
524 if (hard_iface
->soft_iface
)
525 batadv_update_min_mtu(hard_iface
->soft_iface
);
527 case NETDEV_CHANGEADDR
:
528 if (hard_iface
->if_status
== BATADV_IF_NOT_IN_USE
)
531 batadv_check_known_mac_addr(hard_iface
->net_dev
);
533 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
534 bat_priv
->bat_algo_ops
->bat_iface_update_mac(hard_iface
);
536 primary_if
= batadv_primary_if_get_selected(bat_priv
);
540 if (hard_iface
== primary_if
)
541 batadv_primary_if_update_addr(bat_priv
, NULL
);
548 batadv_hardif_free_ref(hard_iface
);
551 batadv_hardif_free_ref(primary_if
);
555 /* This function returns true if the interface represented by ifindex is a
556 * 802.11 wireless device
558 bool batadv_is_wifi_iface(int ifindex
)
560 struct net_device
*net_device
= NULL
;
563 if (ifindex
== BATADV_NULL_IFINDEX
)
566 net_device
= dev_get_by_index(&init_net
, ifindex
);
570 #ifdef CONFIG_WIRELESS_EXT
571 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
572 * check for wireless_handlers != NULL
574 if (net_device
->wireless_handlers
)
578 /* cfg80211 drivers have to set ieee80211_ptr */
579 if (net_device
->ieee80211_ptr
)
587 struct notifier_block batadv_hard_if_notifier
= {
588 .notifier_call
= batadv_hard_if_event
,