2 * Copyright (C) 2007-2011 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"
33 #include <linux/if_arp.h>
36 static int batman_skb_recv(struct sk_buff *skb,
37 struct net_device *dev,
38 struct packet_type *ptype,
39 struct net_device *orig_dev);
41 void hardif_free_rcu(struct rcu_head *rcu)
43 struct hard_iface *hard_iface;
45 hard_iface = container_of(rcu, struct hard_iface, rcu);
46 dev_put(hard_iface->net_dev);
50 struct hard_iface *hardif_get_by_netdev(const struct net_device *net_dev)
52 struct hard_iface *hard_iface;
55 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
56 if (hard_iface->net_dev == net_dev &&
57 atomic_inc_not_zero(&hard_iface->refcount))
68 static int is_valid_iface(const struct net_device *net_dev)
70 if (net_dev->flags & IFF_LOOPBACK)
73 if (net_dev->type != ARPHRD_ETHER)
76 if (net_dev->addr_len != ETH_ALEN)
79 /* no batman over batman */
80 if (softif_is_valid(net_dev))
83 /* Device is being bridged */
84 /* if (net_dev->priv_flags & IFF_BRIDGE_PORT)
90 static struct hard_iface *hardif_get_active(const struct net_device *soft_iface)
92 struct hard_iface *hard_iface;
95 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
96 if (hard_iface->soft_iface != soft_iface)
99 if (hard_iface->if_status == IF_ACTIVE &&
100 atomic_inc_not_zero(&hard_iface->refcount))
111 static void primary_if_update_addr(struct bat_priv *bat_priv)
113 struct vis_packet *vis_packet;
114 struct hard_iface *primary_if;
116 primary_if = primary_if_get_selected(bat_priv);
120 vis_packet = (struct vis_packet *)
121 bat_priv->my_vis_info->skb_packet->data;
122 memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
123 memcpy(vis_packet->sender_orig,
124 primary_if->net_dev->dev_addr, ETH_ALEN);
128 hardif_free_ref(primary_if);
131 static void primary_if_select(struct bat_priv *bat_priv,
132 struct hard_iface *new_hard_iface)
134 struct hard_iface *curr_hard_iface;
138 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
139 new_hard_iface = NULL;
141 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
142 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
145 hardif_free_ref(curr_hard_iface);
150 bat_ogm_init_primary(new_hard_iface);
151 primary_if_update_addr(bat_priv);
154 static bool hardif_is_iface_up(const struct hard_iface *hard_iface)
156 if (hard_iface->net_dev->flags & IFF_UP)
162 static void check_known_mac_addr(const struct net_device *net_dev)
164 const struct hard_iface *hard_iface;
167 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
168 if ((hard_iface->if_status != IF_ACTIVE) &&
169 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
172 if (hard_iface->net_dev == net_dev)
175 if (!compare_eth(hard_iface->net_dev->dev_addr,
179 pr_warning("The newly added mac address (%pM) already exists "
180 "on: %s\n", net_dev->dev_addr,
181 hard_iface->net_dev->name);
182 pr_warning("It is strongly recommended to keep mac addresses "
183 "unique to avoid problems!\n");
188 int hardif_min_mtu(struct net_device *soft_iface)
190 const struct bat_priv *bat_priv = netdev_priv(soft_iface);
191 const struct hard_iface *hard_iface;
192 /* allow big frames if all devices are capable to do so
193 * (have MTU > 1500 + BAT_HEADER_LEN) */
194 int min_mtu = ETH_DATA_LEN;
196 if (atomic_read(&bat_priv->fragmentation))
200 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
201 if ((hard_iface->if_status != IF_ACTIVE) &&
202 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
205 if (hard_iface->soft_iface != soft_iface)
208 min_mtu = min_t(int, hard_iface->net_dev->mtu - BAT_HEADER_LEN,
216 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
217 void update_min_mtu(struct net_device *soft_iface)
221 min_mtu = hardif_min_mtu(soft_iface);
222 if (soft_iface->mtu != min_mtu)
223 soft_iface->mtu = min_mtu;
226 static void hardif_activate_interface(struct hard_iface *hard_iface)
228 struct bat_priv *bat_priv;
229 struct hard_iface *primary_if = NULL;
231 if (hard_iface->if_status != IF_INACTIVE)
234 bat_priv = netdev_priv(hard_iface->soft_iface);
236 bat_ogm_update_mac(hard_iface);
237 hard_iface->if_status = IF_TO_BE_ACTIVATED;
240 * the first active interface becomes our primary interface or
241 * the next active interface after the old primary interface was removed
243 primary_if = primary_if_get_selected(bat_priv);
245 primary_if_select(bat_priv, hard_iface);
247 bat_info(hard_iface->soft_iface, "Interface activated: %s\n",
248 hard_iface->net_dev->name);
250 update_min_mtu(hard_iface->soft_iface);
254 hardif_free_ref(primary_if);
257 static void hardif_deactivate_interface(struct hard_iface *hard_iface)
259 if ((hard_iface->if_status != IF_ACTIVE) &&
260 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
263 hard_iface->if_status = IF_INACTIVE;
265 bat_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
266 hard_iface->net_dev->name);
268 update_min_mtu(hard_iface->soft_iface);
271 int hardif_enable_interface(struct hard_iface *hard_iface,
272 const char *iface_name)
274 struct bat_priv *bat_priv;
275 struct net_device *soft_iface;
278 if (hard_iface->if_status != IF_NOT_IN_USE)
281 if (!atomic_inc_not_zero(&hard_iface->refcount))
284 soft_iface = dev_get_by_name(&init_net, iface_name);
287 soft_iface = softif_create(iface_name);
294 /* dev_get_by_name() increases the reference counter for us */
295 dev_hold(soft_iface);
298 if (!softif_is_valid(soft_iface)) {
299 pr_err("Can't create batman mesh interface %s: "
300 "already exists as regular interface\n",
307 hard_iface->soft_iface = soft_iface;
308 bat_priv = netdev_priv(hard_iface->soft_iface);
310 bat_ogm_init(hard_iface);
312 if (!hard_iface->packet_buff) {
313 bat_err(hard_iface->soft_iface, "Can't add interface packet "
314 "(%s): out of memory\n", hard_iface->net_dev->name);
319 hard_iface->if_num = bat_priv->num_ifaces;
320 bat_priv->num_ifaces++;
321 hard_iface->if_status = IF_INACTIVE;
322 orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
324 hard_iface->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN);
325 hard_iface->batman_adv_ptype.func = batman_skb_recv;
326 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
327 dev_add_pack(&hard_iface->batman_adv_ptype);
329 atomic_set(&hard_iface->seqno, 1);
330 atomic_set(&hard_iface->frag_seqno, 1);
331 bat_info(hard_iface->soft_iface, "Adding interface: %s\n",
332 hard_iface->net_dev->name);
334 if (atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
335 ETH_DATA_LEN + BAT_HEADER_LEN)
336 bat_info(hard_iface->soft_iface,
337 "The MTU of interface %s is too small (%i) to handle "
338 "the transport of batman-adv packets. Packets going "
339 "over this interface will be fragmented on layer2 "
340 "which could impact the performance. Setting the MTU "
341 "to %zi would solve the problem.\n",
342 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
343 ETH_DATA_LEN + BAT_HEADER_LEN);
345 if (!atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
346 ETH_DATA_LEN + BAT_HEADER_LEN)
347 bat_info(hard_iface->soft_iface,
348 "The MTU of interface %s is too small (%i) to handle "
349 "the transport of batman-adv packets. If you experience"
350 " problems getting traffic through try increasing the "
352 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
353 ETH_DATA_LEN + BAT_HEADER_LEN);
355 if (hardif_is_iface_up(hard_iface))
356 hardif_activate_interface(hard_iface);
358 bat_err(hard_iface->soft_iface, "Not using interface %s "
359 "(retrying later): interface not active\n",
360 hard_iface->net_dev->name);
362 /* begin scheduling originator messages on that interface */
363 schedule_bat_ogm(hard_iface);
369 hardif_free_ref(hard_iface);
373 void hardif_disable_interface(struct hard_iface *hard_iface)
375 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
376 struct hard_iface *primary_if = NULL;
378 if (hard_iface->if_status == IF_ACTIVE)
379 hardif_deactivate_interface(hard_iface);
381 if (hard_iface->if_status != IF_INACTIVE)
384 bat_info(hard_iface->soft_iface, "Removing interface: %s\n",
385 hard_iface->net_dev->name);
386 dev_remove_pack(&hard_iface->batman_adv_ptype);
388 bat_priv->num_ifaces--;
389 orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
391 primary_if = primary_if_get_selected(bat_priv);
392 if (hard_iface == primary_if) {
393 struct hard_iface *new_if;
395 new_if = hardif_get_active(hard_iface->soft_iface);
396 primary_if_select(bat_priv, new_if);
399 hardif_free_ref(new_if);
402 kfree(hard_iface->packet_buff);
403 hard_iface->packet_buff = NULL;
404 hard_iface->if_status = IF_NOT_IN_USE;
406 /* delete all references to this hard_iface */
407 purge_orig_ref(bat_priv);
408 purge_outstanding_packets(bat_priv, hard_iface);
409 dev_put(hard_iface->soft_iface);
411 /* nobody uses this interface anymore */
412 if (!bat_priv->num_ifaces)
413 softif_destroy(hard_iface->soft_iface);
415 hard_iface->soft_iface = NULL;
416 hardif_free_ref(hard_iface);
420 hardif_free_ref(primary_if);
423 static struct hard_iface *hardif_add_interface(struct net_device *net_dev)
425 struct hard_iface *hard_iface;
430 ret = is_valid_iface(net_dev);
436 hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC);
440 ret = sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
444 hard_iface->if_num = -1;
445 hard_iface->net_dev = net_dev;
446 hard_iface->soft_iface = NULL;
447 hard_iface->if_status = IF_NOT_IN_USE;
448 INIT_LIST_HEAD(&hard_iface->list);
449 /* extra reference for return */
450 atomic_set(&hard_iface->refcount, 2);
452 check_known_mac_addr(hard_iface->net_dev);
453 list_add_tail_rcu(&hard_iface->list, &hardif_list);
465 static void hardif_remove_interface(struct hard_iface *hard_iface)
469 /* first deactivate interface */
470 if (hard_iface->if_status != IF_NOT_IN_USE)
471 hardif_disable_interface(hard_iface);
473 if (hard_iface->if_status != IF_NOT_IN_USE)
476 hard_iface->if_status = IF_TO_BE_REMOVED;
477 sysfs_del_hardif(&hard_iface->hardif_obj);
478 hardif_free_ref(hard_iface);
481 void hardif_remove_interfaces(void)
483 struct hard_iface *hard_iface, *hard_iface_tmp;
486 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
487 &hardif_list, list) {
488 list_del_rcu(&hard_iface->list);
489 hardif_remove_interface(hard_iface);
494 static int hard_if_event(struct notifier_block *this,
495 unsigned long event, void *ptr)
497 struct net_device *net_dev = ptr;
498 struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
499 struct hard_iface *primary_if = NULL;
500 struct bat_priv *bat_priv;
502 if (!hard_iface && event == NETDEV_REGISTER)
503 hard_iface = hardif_add_interface(net_dev);
510 hardif_activate_interface(hard_iface);
512 case NETDEV_GOING_DOWN:
514 hardif_deactivate_interface(hard_iface);
516 case NETDEV_UNREGISTER:
517 list_del_rcu(&hard_iface->list);
519 hardif_remove_interface(hard_iface);
521 case NETDEV_CHANGEMTU:
522 if (hard_iface->soft_iface)
523 update_min_mtu(hard_iface->soft_iface);
525 case NETDEV_CHANGEADDR:
526 if (hard_iface->if_status == IF_NOT_IN_USE)
529 check_known_mac_addr(hard_iface->net_dev);
530 bat_ogm_update_mac(hard_iface);
532 bat_priv = netdev_priv(hard_iface->soft_iface);
533 primary_if = primary_if_get_selected(bat_priv);
537 if (hard_iface == primary_if)
538 primary_if_update_addr(bat_priv);
545 hardif_free_ref(hard_iface);
548 hardif_free_ref(primary_if);
552 /* incoming packets with the batman ethertype received on any active hard
554 static int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
555 struct packet_type *ptype,
556 struct net_device *orig_dev)
558 struct bat_priv *bat_priv;
559 struct batman_ogm_packet *batman_ogm_packet;
560 struct hard_iface *hard_iface;
563 hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
564 skb = skb_share_check(skb, GFP_ATOMIC);
566 /* skb was released by skb_share_check() */
570 /* packet should hold at least type and version */
571 if (unlikely(!pskb_may_pull(skb, 2)))
574 /* expect a valid ethernet header here. */
575 if (unlikely(skb->mac_len != sizeof(struct ethhdr)
576 || !skb_mac_header(skb)))
579 if (!hard_iface->soft_iface)
582 bat_priv = netdev_priv(hard_iface->soft_iface);
584 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
587 /* discard frames on not active interfaces */
588 if (hard_iface->if_status != IF_ACTIVE)
591 batman_ogm_packet = (struct batman_ogm_packet *)skb->data;
593 if (batman_ogm_packet->version != COMPAT_VERSION) {
594 bat_dbg(DBG_BATMAN, bat_priv,
595 "Drop packet: incompatible batman version (%i)\n",
596 batman_ogm_packet->version);
600 /* all receive handlers return whether they received or reused
601 * the supplied skb. if not, we have to free the skb. */
603 switch (batman_ogm_packet->packet_type) {
604 /* batman originator packet */
606 ret = recv_bat_ogm_packet(skb, hard_iface);
609 /* batman icmp packet */
611 ret = recv_icmp_packet(skb, hard_iface);
616 ret = recv_unicast_packet(skb, hard_iface);
619 /* fragmented unicast packet */
620 case BAT_UNICAST_FRAG:
621 ret = recv_ucast_frag_packet(skb, hard_iface);
624 /* broadcast packet */
626 ret = recv_bcast_packet(skb, hard_iface);
631 ret = recv_vis_packet(skb, hard_iface);
633 /* Translation table query (request or response) */
635 ret = recv_tt_query(skb, hard_iface);
637 /* Roaming advertisement */
639 ret = recv_roam_adv(skb, hard_iface);
645 if (ret == NET_RX_DROP)
648 /* return NET_RX_SUCCESS in any case as we
649 * most probably dropped the packet for
650 * routing-logical reasons. */
652 return NET_RX_SUCCESS;
660 /* This function returns true if the interface represented by ifindex is a
661 * 802.11 wireless device */
662 bool is_wifi_iface(int ifindex)
664 struct net_device *net_device = NULL;
667 if (ifindex == NULL_IFINDEX)
670 net_device = dev_get_by_index(&init_net, ifindex);
674 #ifdef CONFIG_WIRELESS_EXT
675 /* pre-cfg80211 drivers have to implement WEXT, so it is possible to
676 * check for wireless_handlers != NULL */
677 if (net_device->wireless_handlers)
681 /* cfg80211 drivers have to set ieee80211_ptr */
682 if (net_device->ieee80211_ptr)
690 struct notifier_block hard_if_notifier = {
691 .notifier_call = hard_if_event,