2 * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #include "hard-interface.h"
24 #include "soft-interface.h"
26 #include "translation-table.h"
28 #include "bat_sysfs.h"
29 #include "originator.h"
32 #include <linux/if_arp.h>
35 static int batman_skb_recv(struct sk_buff *skb,
36 struct net_device *dev,
37 struct packet_type *ptype,
38 struct net_device *orig_dev);
40 void hardif_free_rcu(struct rcu_head *rcu)
42 struct hard_iface *hard_iface;
44 hard_iface = container_of(rcu, struct hard_iface, rcu);
45 dev_put(hard_iface->net_dev);
49 struct hard_iface *hardif_get_by_netdev(const struct net_device *net_dev)
51 struct hard_iface *hard_iface;
54 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
55 if (hard_iface->net_dev == net_dev &&
56 atomic_inc_not_zero(&hard_iface->refcount))
67 static int is_valid_iface(const struct net_device *net_dev)
69 if (net_dev->flags & IFF_LOOPBACK)
72 if (net_dev->type != ARPHRD_ETHER)
75 if (net_dev->addr_len != ETH_ALEN)
78 /* no batman over batman */
79 if (softif_is_valid(net_dev))
82 /* Device is being bridged */
83 /* if (net_dev->priv_flags & IFF_BRIDGE_PORT)
89 static struct hard_iface *hardif_get_active(const struct net_device *soft_iface)
91 struct hard_iface *hard_iface;
94 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
95 if (hard_iface->soft_iface != soft_iface)
98 if (hard_iface->if_status == IF_ACTIVE &&
99 atomic_inc_not_zero(&hard_iface->refcount))
110 static void primary_if_update_addr(struct bat_priv *bat_priv)
112 struct vis_packet *vis_packet;
113 struct hard_iface *primary_if;
115 primary_if = primary_if_get_selected(bat_priv);
119 vis_packet = (struct vis_packet *)
120 bat_priv->my_vis_info->skb_packet->data;
121 memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
122 memcpy(vis_packet->sender_orig,
123 primary_if->net_dev->dev_addr, ETH_ALEN);
127 hardif_free_ref(primary_if);
130 static void primary_if_select(struct bat_priv *bat_priv,
131 struct hard_iface *new_hard_iface)
133 struct hard_iface *curr_hard_iface;
137 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
138 new_hard_iface = NULL;
140 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
141 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
144 hardif_free_ref(curr_hard_iface);
149 bat_priv->bat_algo_ops->bat_ogm_init_primary(new_hard_iface);
150 primary_if_update_addr(bat_priv);
153 static bool hardif_is_iface_up(const struct hard_iface *hard_iface)
155 if (hard_iface->net_dev->flags & IFF_UP)
161 static void check_known_mac_addr(const struct net_device *net_dev)
163 const struct hard_iface *hard_iface;
166 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
167 if ((hard_iface->if_status != IF_ACTIVE) &&
168 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
171 if (hard_iface->net_dev == net_dev)
174 if (!compare_eth(hard_iface->net_dev->dev_addr,
178 pr_warning("The newly added mac address (%pM) already exists on: %s\n",
179 net_dev->dev_addr, hard_iface->net_dev->name);
180 pr_warning("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
185 int hardif_min_mtu(struct net_device *soft_iface)
187 const struct bat_priv *bat_priv = netdev_priv(soft_iface);
188 const struct hard_iface *hard_iface;
189 /* allow big frames if all devices are capable to do so
190 * (have MTU > 1500 + BAT_HEADER_LEN) */
191 int min_mtu = ETH_DATA_LEN;
193 if (atomic_read(&bat_priv->fragmentation))
197 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
198 if ((hard_iface->if_status != IF_ACTIVE) &&
199 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
202 if (hard_iface->soft_iface != soft_iface)
205 min_mtu = min_t(int, hard_iface->net_dev->mtu - BAT_HEADER_LEN,
213 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
214 void update_min_mtu(struct net_device *soft_iface)
218 min_mtu = hardif_min_mtu(soft_iface);
219 if (soft_iface->mtu != min_mtu)
220 soft_iface->mtu = min_mtu;
223 static void hardif_activate_interface(struct hard_iface *hard_iface)
225 struct bat_priv *bat_priv;
226 struct hard_iface *primary_if = NULL;
228 if (hard_iface->if_status != IF_INACTIVE)
231 bat_priv = netdev_priv(hard_iface->soft_iface);
233 bat_priv->bat_algo_ops->bat_ogm_update_mac(hard_iface);
234 hard_iface->if_status = IF_TO_BE_ACTIVATED;
237 * the first active interface becomes our primary interface or
238 * the next active interface after the old primary interface was removed
240 primary_if = primary_if_get_selected(bat_priv);
242 primary_if_select(bat_priv, hard_iface);
244 bat_info(hard_iface->soft_iface, "Interface activated: %s\n",
245 hard_iface->net_dev->name);
247 update_min_mtu(hard_iface->soft_iface);
251 hardif_free_ref(primary_if);
254 static void hardif_deactivate_interface(struct hard_iface *hard_iface)
256 if ((hard_iface->if_status != IF_ACTIVE) &&
257 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
260 hard_iface->if_status = IF_INACTIVE;
262 bat_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
263 hard_iface->net_dev->name);
265 update_min_mtu(hard_iface->soft_iface);
268 int hardif_enable_interface(struct hard_iface *hard_iface,
269 const char *iface_name)
271 struct bat_priv *bat_priv;
272 struct net_device *soft_iface;
275 if (hard_iface->if_status != 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 = softif_create(iface_name);
296 /* dev_get_by_name() increases the reference counter for us */
297 dev_hold(soft_iface);
300 if (!softif_is_valid(soft_iface)) {
301 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
308 hard_iface->soft_iface = soft_iface;
309 bat_priv = netdev_priv(hard_iface->soft_iface);
311 bat_priv->bat_algo_ops->bat_ogm_init(hard_iface);
313 if (!hard_iface->packet_buff) {
314 bat_err(hard_iface->soft_iface,
315 "Can't add interface packet (%s): out of memory\n",
316 hard_iface->net_dev->name);
321 hard_iface->if_num = bat_priv->num_ifaces;
322 bat_priv->num_ifaces++;
323 hard_iface->if_status = IF_INACTIVE;
324 orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
326 hard_iface->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN);
327 hard_iface->batman_adv_ptype.func = batman_skb_recv;
328 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
329 dev_add_pack(&hard_iface->batman_adv_ptype);
331 atomic_set(&hard_iface->seqno, 1);
332 atomic_set(&hard_iface->frag_seqno, 1);
333 bat_info(hard_iface->soft_iface, "Adding interface: %s\n",
334 hard_iface->net_dev->name);
336 if (atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
337 ETH_DATA_LEN + BAT_HEADER_LEN)
338 bat_info(hard_iface->soft_iface,
339 "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",
340 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
341 ETH_DATA_LEN + BAT_HEADER_LEN);
343 if (!atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
344 ETH_DATA_LEN + BAT_HEADER_LEN)
345 bat_info(hard_iface->soft_iface,
346 "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",
347 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
348 ETH_DATA_LEN + BAT_HEADER_LEN);
350 if (hardif_is_iface_up(hard_iface))
351 hardif_activate_interface(hard_iface);
353 bat_err(hard_iface->soft_iface,
354 "Not using interface %s (retrying later): interface not active\n",
355 hard_iface->net_dev->name);
357 /* begin scheduling originator messages on that interface */
358 schedule_bat_ogm(hard_iface);
364 hardif_free_ref(hard_iface);
368 void hardif_disable_interface(struct hard_iface *hard_iface)
370 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
371 struct hard_iface *primary_if = NULL;
373 if (hard_iface->if_status == IF_ACTIVE)
374 hardif_deactivate_interface(hard_iface);
376 if (hard_iface->if_status != IF_INACTIVE)
379 bat_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 orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
386 primary_if = primary_if_get_selected(bat_priv);
387 if (hard_iface == primary_if) {
388 struct hard_iface *new_if;
390 new_if = hardif_get_active(hard_iface->soft_iface);
391 primary_if_select(bat_priv, new_if);
394 hardif_free_ref(new_if);
397 kfree(hard_iface->packet_buff);
398 hard_iface->packet_buff = NULL;
399 hard_iface->if_status = IF_NOT_IN_USE;
401 /* delete all references to this hard_iface */
402 purge_orig_ref(bat_priv);
403 purge_outstanding_packets(bat_priv, hard_iface);
404 dev_put(hard_iface->soft_iface);
406 /* nobody uses this interface anymore */
407 if (!bat_priv->num_ifaces)
408 softif_destroy(hard_iface->soft_iface);
410 hard_iface->soft_iface = NULL;
411 hardif_free_ref(hard_iface);
415 hardif_free_ref(primary_if);
418 static struct hard_iface *hardif_add_interface(struct net_device *net_dev)
420 struct hard_iface *hard_iface;
425 ret = is_valid_iface(net_dev);
431 hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC);
435 ret = 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 = IF_NOT_IN_USE;
443 INIT_LIST_HEAD(&hard_iface->list);
444 /* extra reference for return */
445 atomic_set(&hard_iface->refcount, 2);
447 check_known_mac_addr(hard_iface->net_dev);
448 list_add_tail_rcu(&hard_iface->list, &hardif_list);
460 static void hardif_remove_interface(struct hard_iface *hard_iface)
464 /* first deactivate interface */
465 if (hard_iface->if_status != IF_NOT_IN_USE)
466 hardif_disable_interface(hard_iface);
468 if (hard_iface->if_status != IF_NOT_IN_USE)
471 hard_iface->if_status = IF_TO_BE_REMOVED;
472 sysfs_del_hardif(&hard_iface->hardif_obj);
473 hardif_free_ref(hard_iface);
476 void hardif_remove_interfaces(void)
478 struct hard_iface *hard_iface, *hard_iface_tmp;
481 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
482 &hardif_list, list) {
483 list_del_rcu(&hard_iface->list);
484 hardif_remove_interface(hard_iface);
489 static int hard_if_event(struct notifier_block *this,
490 unsigned long event, void *ptr)
492 struct net_device *net_dev = ptr;
493 struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
494 struct hard_iface *primary_if = NULL;
495 struct bat_priv *bat_priv;
497 if (!hard_iface && event == NETDEV_REGISTER)
498 hard_iface = hardif_add_interface(net_dev);
505 hardif_activate_interface(hard_iface);
507 case NETDEV_GOING_DOWN:
509 hardif_deactivate_interface(hard_iface);
511 case NETDEV_UNREGISTER:
512 list_del_rcu(&hard_iface->list);
514 hardif_remove_interface(hard_iface);
516 case NETDEV_CHANGEMTU:
517 if (hard_iface->soft_iface)
518 update_min_mtu(hard_iface->soft_iface);
520 case NETDEV_CHANGEADDR:
521 if (hard_iface->if_status == IF_NOT_IN_USE)
524 check_known_mac_addr(hard_iface->net_dev);
526 bat_priv = netdev_priv(hard_iface->soft_iface);
527 bat_priv->bat_algo_ops->bat_ogm_update_mac(hard_iface);
529 primary_if = primary_if_get_selected(bat_priv);
533 if (hard_iface == primary_if)
534 primary_if_update_addr(bat_priv);
541 hardif_free_ref(hard_iface);
544 hardif_free_ref(primary_if);
548 /* incoming packets with the batman ethertype received on any active hard
550 static int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
551 struct packet_type *ptype,
552 struct net_device *orig_dev)
554 struct bat_priv *bat_priv;
555 struct batman_ogm_packet *batman_ogm_packet;
556 struct hard_iface *hard_iface;
559 hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
560 skb = skb_share_check(skb, GFP_ATOMIC);
562 /* skb was released by skb_share_check() */
566 /* packet should hold at least type and version */
567 if (unlikely(!pskb_may_pull(skb, 2)))
570 /* expect a valid ethernet header here. */
571 if (unlikely(skb->mac_len != sizeof(struct ethhdr) ||
572 !skb_mac_header(skb)))
575 if (!hard_iface->soft_iface)
578 bat_priv = netdev_priv(hard_iface->soft_iface);
580 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
583 /* discard frames on not active interfaces */
584 if (hard_iface->if_status != IF_ACTIVE)
587 batman_ogm_packet = (struct batman_ogm_packet *)skb->data;
589 if (batman_ogm_packet->header.version != COMPAT_VERSION) {
590 bat_dbg(DBG_BATMAN, bat_priv,
591 "Drop packet: incompatible batman version (%i)\n",
592 batman_ogm_packet->header.version);
596 /* all receive handlers return whether they received or reused
597 * the supplied skb. if not, we have to free the skb. */
599 switch (batman_ogm_packet->header.packet_type) {
600 /* batman originator packet */
602 ret = recv_bat_ogm_packet(skb, hard_iface);
605 /* batman icmp packet */
607 ret = recv_icmp_packet(skb, hard_iface);
612 ret = recv_unicast_packet(skb, hard_iface);
615 /* fragmented unicast packet */
616 case BAT_UNICAST_FRAG:
617 ret = recv_ucast_frag_packet(skb, hard_iface);
620 /* broadcast packet */
622 ret = recv_bcast_packet(skb, hard_iface);
627 ret = recv_vis_packet(skb, hard_iface);
629 /* Translation table query (request or response) */
631 ret = recv_tt_query(skb, hard_iface);
633 /* Roaming advertisement */
635 ret = recv_roam_adv(skb, hard_iface);
641 if (ret == NET_RX_DROP)
644 /* return NET_RX_SUCCESS in any case as we
645 * most probably dropped the packet for
646 * routing-logical reasons. */
648 return NET_RX_SUCCESS;
656 /* This function returns true if the interface represented by ifindex is a
657 * 802.11 wireless device */
658 bool is_wifi_iface(int ifindex)
660 struct net_device *net_device = NULL;
663 if (ifindex == NULL_IFINDEX)
666 net_device = dev_get_by_index(&init_net, ifindex);
670 #ifdef CONFIG_WIRELESS_EXT
671 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
672 * check for wireless_handlers != NULL */
673 if (net_device->wireless_handlers)
677 /* cfg80211 drivers have to set ieee80211_ptr */
678 if (net_device->ieee80211_ptr)
686 struct notifier_block hard_if_notifier = {
687 .notifier_call = hard_if_event,