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"
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(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(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(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;
134 struct batman_packet *batman_packet;
138 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
139 new_hard_iface = NULL;
141 curr_hard_iface = bat_priv->primary_if;
142 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
145 hardif_free_ref(curr_hard_iface);
150 batman_packet = (struct batman_packet *)(new_hard_iface->packet_buff);
151 batman_packet->flags = PRIMARIES_FIRST_HOP;
152 batman_packet->ttl = TTL;
154 primary_if_update_addr(bat_priv);
157 * hacky trick to make sure that we send the TT information via
158 * our new primary interface
160 atomic_set(&bat_priv->tt_local_changed, 1);
163 static bool hardif_is_iface_up(struct hard_iface *hard_iface)
165 if (hard_iface->net_dev->flags & IFF_UP)
171 static void update_mac_addresses(struct hard_iface *hard_iface)
173 memcpy(((struct batman_packet *)(hard_iface->packet_buff))->orig,
174 hard_iface->net_dev->dev_addr, ETH_ALEN);
175 memcpy(((struct batman_packet *)(hard_iface->packet_buff))->prev_sender,
176 hard_iface->net_dev->dev_addr, ETH_ALEN);
179 static void check_known_mac_addr(struct net_device *net_dev)
181 struct hard_iface *hard_iface;
184 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
185 if ((hard_iface->if_status != IF_ACTIVE) &&
186 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
189 if (hard_iface->net_dev == net_dev)
192 if (!compare_eth(hard_iface->net_dev->dev_addr,
196 pr_warning("The newly added mac address (%pM) already exists "
197 "on: %s\n", net_dev->dev_addr,
198 hard_iface->net_dev->name);
199 pr_warning("It is strongly recommended to keep mac addresses "
200 "unique to avoid problems!\n");
205 int hardif_min_mtu(struct net_device *soft_iface)
207 struct bat_priv *bat_priv = netdev_priv(soft_iface);
208 struct hard_iface *hard_iface;
209 /* allow big frames if all devices are capable to do so
210 * (have MTU > 1500 + BAT_HEADER_LEN) */
211 int min_mtu = ETH_DATA_LEN;
213 if (atomic_read(&bat_priv->fragmentation))
217 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
218 if ((hard_iface->if_status != IF_ACTIVE) &&
219 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
222 if (hard_iface->soft_iface != soft_iface)
225 min_mtu = min_t(int, hard_iface->net_dev->mtu - BAT_HEADER_LEN,
233 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
234 void update_min_mtu(struct net_device *soft_iface)
238 min_mtu = hardif_min_mtu(soft_iface);
239 if (soft_iface->mtu != min_mtu)
240 soft_iface->mtu = min_mtu;
243 static void hardif_activate_interface(struct hard_iface *hard_iface)
245 struct bat_priv *bat_priv;
246 struct hard_iface *primary_if = NULL;
248 if (hard_iface->if_status != IF_INACTIVE)
251 bat_priv = netdev_priv(hard_iface->soft_iface);
253 update_mac_addresses(hard_iface);
254 hard_iface->if_status = IF_TO_BE_ACTIVATED;
257 * the first active interface becomes our primary interface or
258 * the next active interface after the old primay interface was removed
260 primary_if = primary_if_get_selected(bat_priv);
262 primary_if_select(bat_priv, hard_iface);
264 bat_info(hard_iface->soft_iface, "Interface activated: %s\n",
265 hard_iface->net_dev->name);
267 update_min_mtu(hard_iface->soft_iface);
271 hardif_free_ref(primary_if);
274 static void hardif_deactivate_interface(struct hard_iface *hard_iface)
276 if ((hard_iface->if_status != IF_ACTIVE) &&
277 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
280 hard_iface->if_status = IF_INACTIVE;
282 bat_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
283 hard_iface->net_dev->name);
285 update_min_mtu(hard_iface->soft_iface);
288 int hardif_enable_interface(struct hard_iface *hard_iface, char *iface_name)
290 struct bat_priv *bat_priv;
291 struct batman_packet *batman_packet;
292 struct net_device *soft_iface;
295 if (hard_iface->if_status != IF_NOT_IN_USE)
298 if (!atomic_inc_not_zero(&hard_iface->refcount))
301 soft_iface = dev_get_by_name(&init_net, iface_name);
304 soft_iface = softif_create(iface_name);
311 /* dev_get_by_name() increases the reference counter for us */
312 dev_hold(soft_iface);
315 if (!softif_is_valid(soft_iface)) {
316 pr_err("Can't create batman mesh interface %s: "
317 "already exists as regular interface\n",
324 hard_iface->soft_iface = soft_iface;
325 bat_priv = netdev_priv(hard_iface->soft_iface);
326 hard_iface->packet_len = BAT_PACKET_LEN;
327 hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
329 if (!hard_iface->packet_buff) {
330 bat_err(hard_iface->soft_iface, "Can't add interface packet "
331 "(%s): out of memory\n", hard_iface->net_dev->name);
336 batman_packet = (struct batman_packet *)(hard_iface->packet_buff);
337 batman_packet->packet_type = BAT_PACKET;
338 batman_packet->version = COMPAT_VERSION;
339 batman_packet->flags = 0;
340 batman_packet->ttl = 2;
341 batman_packet->tq = TQ_MAX_VALUE;
342 batman_packet->num_tt = 0;
344 hard_iface->if_num = bat_priv->num_ifaces;
345 bat_priv->num_ifaces++;
346 hard_iface->if_status = IF_INACTIVE;
347 orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
349 hard_iface->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN);
350 hard_iface->batman_adv_ptype.func = batman_skb_recv;
351 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
352 dev_add_pack(&hard_iface->batman_adv_ptype);
354 atomic_set(&hard_iface->seqno, 1);
355 atomic_set(&hard_iface->frag_seqno, 1);
356 bat_info(hard_iface->soft_iface, "Adding interface: %s\n",
357 hard_iface->net_dev->name);
359 if (atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
360 ETH_DATA_LEN + BAT_HEADER_LEN)
361 bat_info(hard_iface->soft_iface,
362 "The MTU of interface %s is too small (%i) to handle "
363 "the transport of batman-adv packets. Packets going "
364 "over this interface will be fragmented on layer2 "
365 "which could impact the performance. Setting the MTU "
366 "to %zi would solve the problem.\n",
367 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
368 ETH_DATA_LEN + BAT_HEADER_LEN);
370 if (!atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
371 ETH_DATA_LEN + BAT_HEADER_LEN)
372 bat_info(hard_iface->soft_iface,
373 "The MTU of interface %s is too small (%i) to handle "
374 "the transport of batman-adv packets. If you experience"
375 " problems getting traffic through try increasing the "
377 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
378 ETH_DATA_LEN + BAT_HEADER_LEN);
380 if (hardif_is_iface_up(hard_iface))
381 hardif_activate_interface(hard_iface);
383 bat_err(hard_iface->soft_iface, "Not using interface %s "
384 "(retrying later): interface not active\n",
385 hard_iface->net_dev->name);
387 /* begin scheduling originator messages on that interface */
388 schedule_own_packet(hard_iface);
394 hardif_free_ref(hard_iface);
398 void hardif_disable_interface(struct hard_iface *hard_iface)
400 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
401 struct hard_iface *primary_if = NULL;
403 if (hard_iface->if_status == IF_ACTIVE)
404 hardif_deactivate_interface(hard_iface);
406 if (hard_iface->if_status != IF_INACTIVE)
409 bat_info(hard_iface->soft_iface, "Removing interface: %s\n",
410 hard_iface->net_dev->name);
411 dev_remove_pack(&hard_iface->batman_adv_ptype);
413 bat_priv->num_ifaces--;
414 orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
416 primary_if = primary_if_get_selected(bat_priv);
417 if (hard_iface == primary_if) {
418 struct hard_iface *new_if;
420 new_if = hardif_get_active(hard_iface->soft_iface);
421 primary_if_select(bat_priv, new_if);
424 hardif_free_ref(new_if);
427 kfree(hard_iface->packet_buff);
428 hard_iface->packet_buff = NULL;
429 hard_iface->if_status = IF_NOT_IN_USE;
431 /* delete all references to this hard_iface */
432 purge_orig_ref(bat_priv);
433 purge_outstanding_packets(bat_priv, hard_iface);
434 dev_put(hard_iface->soft_iface);
436 /* nobody uses this interface anymore */
437 if (!bat_priv->num_ifaces)
438 softif_destroy(hard_iface->soft_iface);
440 hard_iface->soft_iface = NULL;
441 hardif_free_ref(hard_iface);
445 hardif_free_ref(primary_if);
448 static struct hard_iface *hardif_add_interface(struct net_device *net_dev)
450 struct hard_iface *hard_iface;
455 ret = is_valid_iface(net_dev);
461 hard_iface = kmalloc(sizeof(struct hard_iface), GFP_ATOMIC);
463 pr_err("Can't add interface (%s): out of memory\n",
468 ret = sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
472 hard_iface->if_num = -1;
473 hard_iface->net_dev = net_dev;
474 hard_iface->soft_iface = NULL;
475 hard_iface->if_status = IF_NOT_IN_USE;
476 INIT_LIST_HEAD(&hard_iface->list);
477 /* extra reference for return */
478 atomic_set(&hard_iface->refcount, 2);
480 check_known_mac_addr(hard_iface->net_dev);
481 list_add_tail_rcu(&hard_iface->list, &hardif_list);
493 static void hardif_remove_interface(struct hard_iface *hard_iface)
497 /* first deactivate interface */
498 if (hard_iface->if_status != IF_NOT_IN_USE)
499 hardif_disable_interface(hard_iface);
501 if (hard_iface->if_status != IF_NOT_IN_USE)
504 hard_iface->if_status = IF_TO_BE_REMOVED;
505 sysfs_del_hardif(&hard_iface->hardif_obj);
506 hardif_free_ref(hard_iface);
509 void hardif_remove_interfaces(void)
511 struct hard_iface *hard_iface, *hard_iface_tmp;
514 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
515 &hardif_list, list) {
516 list_del_rcu(&hard_iface->list);
517 hardif_remove_interface(hard_iface);
522 static int hard_if_event(struct notifier_block *this,
523 unsigned long event, void *ptr)
525 struct net_device *net_dev = (struct net_device *)ptr;
526 struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
527 struct hard_iface *primary_if = NULL;
528 struct bat_priv *bat_priv;
530 if (!hard_iface && event == NETDEV_REGISTER)
531 hard_iface = hardif_add_interface(net_dev);
538 hardif_activate_interface(hard_iface);
540 case NETDEV_GOING_DOWN:
542 hardif_deactivate_interface(hard_iface);
544 case NETDEV_UNREGISTER:
545 list_del_rcu(&hard_iface->list);
547 hardif_remove_interface(hard_iface);
549 case NETDEV_CHANGEMTU:
550 if (hard_iface->soft_iface)
551 update_min_mtu(hard_iface->soft_iface);
553 case NETDEV_CHANGEADDR:
554 if (hard_iface->if_status == IF_NOT_IN_USE)
557 check_known_mac_addr(hard_iface->net_dev);
558 update_mac_addresses(hard_iface);
560 bat_priv = netdev_priv(hard_iface->soft_iface);
561 primary_if = primary_if_get_selected(bat_priv);
565 if (hard_iface == primary_if)
566 primary_if_update_addr(bat_priv);
573 hardif_free_ref(hard_iface);
576 hardif_free_ref(primary_if);
580 /* receive a packet with the batman ethertype coming on a hard
582 static int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
583 struct packet_type *ptype,
584 struct net_device *orig_dev)
586 struct bat_priv *bat_priv;
587 struct batman_packet *batman_packet;
588 struct hard_iface *hard_iface;
591 hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
592 skb = skb_share_check(skb, GFP_ATOMIC);
594 /* skb was released by skb_share_check() */
598 /* packet should hold at least type and version */
599 if (unlikely(!pskb_may_pull(skb, 2)))
602 /* expect a valid ethernet header here. */
603 if (unlikely(skb->mac_len != sizeof(struct ethhdr)
604 || !skb_mac_header(skb)))
607 if (!hard_iface->soft_iface)
610 bat_priv = netdev_priv(hard_iface->soft_iface);
612 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
615 /* discard frames on not active interfaces */
616 if (hard_iface->if_status != IF_ACTIVE)
619 batman_packet = (struct batman_packet *)skb->data;
621 if (batman_packet->version != COMPAT_VERSION) {
622 bat_dbg(DBG_BATMAN, bat_priv,
623 "Drop packet: incompatible batman version (%i)\n",
624 batman_packet->version);
628 /* all receive handlers return whether they received or reused
629 * the supplied skb. if not, we have to free the skb. */
631 switch (batman_packet->packet_type) {
632 /* batman originator packet */
634 ret = recv_bat_packet(skb, hard_iface);
637 /* batman icmp packet */
639 ret = recv_icmp_packet(skb, hard_iface);
644 ret = recv_unicast_packet(skb, hard_iface);
647 /* fragmented unicast packet */
648 case BAT_UNICAST_FRAG:
649 ret = recv_ucast_frag_packet(skb, hard_iface);
652 /* broadcast packet */
654 ret = recv_bcast_packet(skb, hard_iface);
659 ret = recv_vis_packet(skb, hard_iface);
665 if (ret == NET_RX_DROP)
668 /* return NET_RX_SUCCESS in any case as we
669 * most probably dropped the packet for
670 * routing-logical reasons. */
672 return NET_RX_SUCCESS;
680 struct notifier_block hard_if_notifier = {
681 .notifier_call = hard_if_event,