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>
34 /* protect update critical side of if_list - but not the content */
35 static DEFINE_SPINLOCK(if_list_lock);
38 static int batman_skb_recv(struct sk_buff *skb,
39 struct net_device *dev,
40 struct packet_type *ptype,
41 struct net_device *orig_dev);
43 static void hardif_free_rcu(struct rcu_head *rcu)
45 struct batman_if *batman_if;
47 batman_if = container_of(rcu, struct batman_if, rcu);
48 dev_put(batman_if->net_dev);
49 kref_put(&batman_if->refcount, hardif_free_ref);
52 struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev)
54 struct batman_if *batman_if;
57 list_for_each_entry_rcu(batman_if, &if_list, list) {
58 if (batman_if->net_dev == net_dev)
66 kref_get(&batman_if->refcount);
72 static int is_valid_iface(struct net_device *net_dev)
74 if (net_dev->flags & IFF_LOOPBACK)
77 if (net_dev->type != ARPHRD_ETHER)
80 if (net_dev->addr_len != ETH_ALEN)
83 /* no batman over batman */
84 #ifdef HAVE_NET_DEVICE_OPS
85 if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
88 if (net_dev->hard_start_xmit == interface_tx)
92 /* Device is being bridged */
93 /* if (net_dev->priv_flags & IFF_BRIDGE_PORT)
99 static struct batman_if *get_active_batman_if(struct net_device *soft_iface)
101 struct batman_if *batman_if;
104 list_for_each_entry_rcu(batman_if, &if_list, list) {
105 if (batman_if->soft_iface != soft_iface)
108 if (batman_if->if_status == IF_ACTIVE)
116 kref_get(&batman_if->refcount);
122 static void update_primary_addr(struct bat_priv *bat_priv)
124 struct vis_packet *vis_packet;
126 vis_packet = (struct vis_packet *)
127 bat_priv->my_vis_info->skb_packet->data;
128 memcpy(vis_packet->vis_orig,
129 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
130 memcpy(vis_packet->sender_orig,
131 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
134 static void set_primary_if(struct bat_priv *bat_priv,
135 struct batman_if *batman_if)
137 struct batman_packet *batman_packet;
138 struct batman_if *old_if;
141 kref_get(&batman_if->refcount);
143 old_if = bat_priv->primary_if;
144 bat_priv->primary_if = batman_if;
147 kref_put(&old_if->refcount, hardif_free_ref);
149 if (!bat_priv->primary_if)
152 batman_packet = (struct batman_packet *)(batman_if->packet_buff);
153 batman_packet->flags = PRIMARIES_FIRST_HOP;
154 batman_packet->ttl = TTL;
156 update_primary_addr(bat_priv);
159 * hacky trick to make sure that we send the HNA information via
160 * our new primary interface
162 atomic_set(&bat_priv->hna_local_changed, 1);
165 static bool hardif_is_iface_up(struct batman_if *batman_if)
167 if (batman_if->net_dev->flags & IFF_UP)
173 static void update_mac_addresses(struct batman_if *batman_if)
175 memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig,
176 batman_if->net_dev->dev_addr, ETH_ALEN);
177 memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender,
178 batman_if->net_dev->dev_addr, ETH_ALEN);
181 static void check_known_mac_addr(struct net_device *net_dev)
183 struct batman_if *batman_if;
186 list_for_each_entry_rcu(batman_if, &if_list, list) {
187 if ((batman_if->if_status != IF_ACTIVE) &&
188 (batman_if->if_status != IF_TO_BE_ACTIVATED))
191 if (batman_if->net_dev == net_dev)
194 if (!compare_orig(batman_if->net_dev->dev_addr,
198 pr_warning("The newly added mac address (%pM) already exists "
199 "on: %s\n", net_dev->dev_addr,
200 batman_if->net_dev->name);
201 pr_warning("It is strongly recommended to keep mac addresses "
202 "unique to avoid problems!\n");
207 int hardif_min_mtu(struct net_device *soft_iface)
209 struct bat_priv *bat_priv = netdev_priv(soft_iface);
210 struct batman_if *batman_if;
211 /* allow big frames if all devices are capable to do so
212 * (have MTU > 1500 + BAT_HEADER_LEN) */
213 int min_mtu = ETH_DATA_LEN;
215 if (atomic_read(&bat_priv->fragmentation))
219 list_for_each_entry_rcu(batman_if, &if_list, list) {
220 if ((batman_if->if_status != IF_ACTIVE) &&
221 (batman_if->if_status != IF_TO_BE_ACTIVATED))
224 if (batman_if->soft_iface != soft_iface)
227 min_mtu = min_t(int, batman_if->net_dev->mtu - BAT_HEADER_LEN,
235 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
236 void update_min_mtu(struct net_device *soft_iface)
240 min_mtu = hardif_min_mtu(soft_iface);
241 if (soft_iface->mtu != min_mtu)
242 soft_iface->mtu = min_mtu;
245 static void hardif_activate_interface(struct batman_if *batman_if)
247 struct bat_priv *bat_priv;
249 if (batman_if->if_status != IF_INACTIVE)
252 bat_priv = netdev_priv(batman_if->soft_iface);
254 update_mac_addresses(batman_if);
255 batman_if->if_status = IF_TO_BE_ACTIVATED;
258 * the first active interface becomes our primary interface or
259 * the next active interface after the old primay interface was removed
261 if (!bat_priv->primary_if)
262 set_primary_if(bat_priv, batman_if);
264 bat_info(batman_if->soft_iface, "Interface activated: %s\n",
265 batman_if->net_dev->name);
267 update_min_mtu(batman_if->soft_iface);
271 static void hardif_deactivate_interface(struct batman_if *batman_if)
273 if ((batman_if->if_status != IF_ACTIVE) &&
274 (batman_if->if_status != IF_TO_BE_ACTIVATED))
277 batman_if->if_status = IF_INACTIVE;
279 bat_info(batman_if->soft_iface, "Interface deactivated: %s\n",
280 batman_if->net_dev->name);
282 update_min_mtu(batman_if->soft_iface);
285 int hardif_enable_interface(struct batman_if *batman_if, char *iface_name)
287 struct bat_priv *bat_priv;
288 struct batman_packet *batman_packet;
290 if (batman_if->if_status != IF_NOT_IN_USE)
293 batman_if->soft_iface = dev_get_by_name(&init_net, iface_name);
295 if (!batman_if->soft_iface) {
296 batman_if->soft_iface = softif_create(iface_name);
298 if (!batman_if->soft_iface)
301 /* dev_get_by_name() increases the reference counter for us */
302 dev_hold(batman_if->soft_iface);
305 bat_priv = netdev_priv(batman_if->soft_iface);
306 batman_if->packet_len = BAT_PACKET_LEN;
307 batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_ATOMIC);
309 if (!batman_if->packet_buff) {
310 bat_err(batman_if->soft_iface, "Can't add interface packet "
311 "(%s): out of memory\n", batman_if->net_dev->name);
315 batman_packet = (struct batman_packet *)(batman_if->packet_buff);
316 batman_packet->packet_type = BAT_PACKET;
317 batman_packet->version = COMPAT_VERSION;
318 batman_packet->flags = 0;
319 batman_packet->ttl = 2;
320 batman_packet->tq = TQ_MAX_VALUE;
321 batman_packet->num_hna = 0;
323 batman_if->if_num = bat_priv->num_ifaces;
324 bat_priv->num_ifaces++;
325 batman_if->if_status = IF_INACTIVE;
326 orig_hash_add_if(batman_if, bat_priv->num_ifaces);
328 batman_if->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN);
329 batman_if->batman_adv_ptype.func = batman_skb_recv;
330 batman_if->batman_adv_ptype.dev = batman_if->net_dev;
331 kref_get(&batman_if->refcount);
332 dev_add_pack(&batman_if->batman_adv_ptype);
334 atomic_set(&batman_if->seqno, 1);
335 atomic_set(&batman_if->frag_seqno, 1);
336 bat_info(batman_if->soft_iface, "Adding interface: %s\n",
337 batman_if->net_dev->name);
339 if (atomic_read(&bat_priv->fragmentation) && batman_if->net_dev->mtu <
340 ETH_DATA_LEN + BAT_HEADER_LEN)
341 bat_info(batman_if->soft_iface,
342 "The MTU of interface %s is too small (%i) to handle "
343 "the transport of batman-adv packets. Packets going "
344 "over this interface will be fragmented on layer2 "
345 "which could impact the performance. Setting the MTU "
346 "to %zi would solve the problem.\n",
347 batman_if->net_dev->name, batman_if->net_dev->mtu,
348 ETH_DATA_LEN + BAT_HEADER_LEN);
350 if (!atomic_read(&bat_priv->fragmentation) && batman_if->net_dev->mtu <
351 ETH_DATA_LEN + BAT_HEADER_LEN)
352 bat_info(batman_if->soft_iface,
353 "The MTU of interface %s is too small (%i) to handle "
354 "the transport of batman-adv packets. If you experience"
355 " problems getting traffic through try increasing the "
357 batman_if->net_dev->name, batman_if->net_dev->mtu,
358 ETH_DATA_LEN + BAT_HEADER_LEN);
360 if (hardif_is_iface_up(batman_if))
361 hardif_activate_interface(batman_if);
363 bat_err(batman_if->soft_iface, "Not using interface %s "
364 "(retrying later): interface not active\n",
365 batman_if->net_dev->name);
367 /* begin scheduling originator messages on that interface */
368 schedule_own_packet(batman_if);
377 void hardif_disable_interface(struct batman_if *batman_if)
379 struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
381 if (batman_if->if_status == IF_ACTIVE)
382 hardif_deactivate_interface(batman_if);
384 if (batman_if->if_status != IF_INACTIVE)
387 bat_info(batman_if->soft_iface, "Removing interface: %s\n",
388 batman_if->net_dev->name);
389 dev_remove_pack(&batman_if->batman_adv_ptype);
390 kref_put(&batman_if->refcount, hardif_free_ref);
392 bat_priv->num_ifaces--;
393 orig_hash_del_if(batman_if, bat_priv->num_ifaces);
395 if (batman_if == bat_priv->primary_if) {
396 struct batman_if *new_if;
398 new_if = get_active_batman_if(batman_if->soft_iface);
399 set_primary_if(bat_priv, new_if);
402 kref_put(&new_if->refcount, hardif_free_ref);
405 kfree(batman_if->packet_buff);
406 batman_if->packet_buff = NULL;
407 batman_if->if_status = IF_NOT_IN_USE;
409 /* delete all references to this batman_if */
410 purge_orig_ref(bat_priv);
411 purge_outstanding_packets(bat_priv, batman_if);
412 dev_put(batman_if->soft_iface);
414 /* nobody uses this interface anymore */
415 if (!bat_priv->num_ifaces)
416 softif_destroy(batman_if->soft_iface);
418 batman_if->soft_iface = NULL;
421 static struct batman_if *hardif_add_interface(struct net_device *net_dev)
423 struct batman_if *batman_if;
426 ret = is_valid_iface(net_dev);
432 batman_if = kmalloc(sizeof(struct batman_if), GFP_ATOMIC);
434 pr_err("Can't add interface (%s): out of memory\n",
439 ret = sysfs_add_hardif(&batman_if->hardif_obj, net_dev);
443 batman_if->if_num = -1;
444 batman_if->net_dev = net_dev;
445 batman_if->soft_iface = NULL;
446 batman_if->if_status = IF_NOT_IN_USE;
447 INIT_LIST_HEAD(&batman_if->list);
448 kref_init(&batman_if->refcount);
450 check_known_mac_addr(batman_if->net_dev);
452 spin_lock(&if_list_lock);
453 list_add_tail_rcu(&batman_if->list, &if_list);
454 spin_unlock(&if_list_lock);
456 /* extra reference for return */
457 kref_get(&batman_if->refcount);
468 static void hardif_remove_interface(struct batman_if *batman_if)
470 /* first deactivate interface */
471 if (batman_if->if_status != IF_NOT_IN_USE)
472 hardif_disable_interface(batman_if);
474 if (batman_if->if_status != IF_NOT_IN_USE)
477 batman_if->if_status = IF_TO_BE_REMOVED;
478 sysfs_del_hardif(&batman_if->hardif_obj);
479 call_rcu(&batman_if->rcu, hardif_free_rcu);
482 void hardif_remove_interfaces(void)
484 struct batman_if *batman_if, *batman_if_tmp;
485 struct list_head if_queue;
487 INIT_LIST_HEAD(&if_queue);
489 spin_lock(&if_list_lock);
490 list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list) {
491 list_del_rcu(&batman_if->list);
492 list_add_tail(&batman_if->list, &if_queue);
494 spin_unlock(&if_list_lock);
497 list_for_each_entry_safe(batman_if, batman_if_tmp, &if_queue, list) {
498 hardif_remove_interface(batman_if);
503 static int hard_if_event(struct notifier_block *this,
504 unsigned long event, void *ptr)
506 struct net_device *net_dev = (struct net_device *)ptr;
507 struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
508 struct bat_priv *bat_priv;
510 if (!batman_if && event == NETDEV_REGISTER)
511 batman_if = hardif_add_interface(net_dev);
518 hardif_activate_interface(batman_if);
520 case NETDEV_GOING_DOWN:
522 hardif_deactivate_interface(batman_if);
524 case NETDEV_UNREGISTER:
525 spin_lock(&if_list_lock);
526 list_del_rcu(&batman_if->list);
527 spin_unlock(&if_list_lock);
529 hardif_remove_interface(batman_if);
531 case NETDEV_CHANGEMTU:
532 if (batman_if->soft_iface)
533 update_min_mtu(batman_if->soft_iface);
535 case NETDEV_CHANGEADDR:
536 if (batman_if->if_status == IF_NOT_IN_USE)
539 check_known_mac_addr(batman_if->net_dev);
540 update_mac_addresses(batman_if);
542 bat_priv = netdev_priv(batman_if->soft_iface);
543 if (batman_if == bat_priv->primary_if)
544 update_primary_addr(bat_priv);
551 kref_put(&batman_if->refcount, hardif_free_ref);
556 /* receive a packet with the batman ethertype coming on a hard
558 static int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
559 struct packet_type *ptype,
560 struct net_device *orig_dev)
562 struct bat_priv *bat_priv;
563 struct batman_packet *batman_packet;
564 struct batman_if *batman_if;
567 batman_if = container_of(ptype, struct batman_if, batman_adv_ptype);
568 skb = skb_share_check(skb, GFP_ATOMIC);
570 /* skb was released by skb_share_check() */
574 /* packet should hold at least type and version */
575 if (unlikely(!pskb_may_pull(skb, 2)))
578 /* expect a valid ethernet header here. */
579 if (unlikely(skb->mac_len != sizeof(struct ethhdr)
580 || !skb_mac_header(skb)))
583 if (!batman_if->soft_iface)
586 bat_priv = netdev_priv(batman_if->soft_iface);
588 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
591 /* discard frames on not active interfaces */
592 if (batman_if->if_status != IF_ACTIVE)
595 batman_packet = (struct batman_packet *)skb->data;
597 if (batman_packet->version != COMPAT_VERSION) {
598 bat_dbg(DBG_BATMAN, bat_priv,
599 "Drop packet: incompatible batman version (%i)\n",
600 batman_packet->version);
604 /* all receive handlers return whether they received or reused
605 * the supplied skb. if not, we have to free the skb. */
607 switch (batman_packet->packet_type) {
608 /* batman originator packet */
610 ret = recv_bat_packet(skb, batman_if);
613 /* batman icmp packet */
615 ret = recv_icmp_packet(skb, batman_if);
620 ret = recv_unicast_packet(skb, batman_if);
623 /* fragmented unicast packet */
624 case BAT_UNICAST_FRAG:
625 ret = recv_ucast_frag_packet(skb, batman_if);
628 /* broadcast packet */
630 ret = recv_bcast_packet(skb, batman_if);
635 ret = recv_vis_packet(skb, batman_if);
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 struct notifier_block hard_if_notifier = {
657 .notifier_call = hard_if_event,