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(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;
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 = 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 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 static bool hardif_is_iface_up(const struct hard_iface *hard_iface)
159 if (hard_iface->net_dev->flags & IFF_UP)
165 static void update_mac_addresses(struct hard_iface *hard_iface)
167 memcpy(((struct batman_packet *)(hard_iface->packet_buff))->orig,
168 hard_iface->net_dev->dev_addr, ETH_ALEN);
169 memcpy(((struct batman_packet *)(hard_iface->packet_buff))->prev_sender,
170 hard_iface->net_dev->dev_addr, ETH_ALEN);
173 static void check_known_mac_addr(const struct net_device *net_dev)
175 const struct hard_iface *hard_iface;
178 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
179 if ((hard_iface->if_status != IF_ACTIVE) &&
180 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
183 if (hard_iface->net_dev == net_dev)
186 if (!compare_eth(hard_iface->net_dev->dev_addr,
190 pr_warning("The newly added mac address (%pM) already exists "
191 "on: %s\n", net_dev->dev_addr,
192 hard_iface->net_dev->name);
193 pr_warning("It is strongly recommended to keep mac addresses "
194 "unique to avoid problems!\n");
199 int hardif_min_mtu(struct net_device *soft_iface)
201 const struct bat_priv *bat_priv = netdev_priv(soft_iface);
202 const struct hard_iface *hard_iface;
203 /* allow big frames if all devices are capable to do so
204 * (have MTU > 1500 + BAT_HEADER_LEN) */
205 int min_mtu = ETH_DATA_LEN;
207 if (atomic_read(&bat_priv->fragmentation))
211 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
212 if ((hard_iface->if_status != IF_ACTIVE) &&
213 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
216 if (hard_iface->soft_iface != soft_iface)
219 min_mtu = min_t(int, hard_iface->net_dev->mtu - BAT_HEADER_LEN,
227 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
228 void update_min_mtu(struct net_device *soft_iface)
232 min_mtu = hardif_min_mtu(soft_iface);
233 if (soft_iface->mtu != min_mtu)
234 soft_iface->mtu = min_mtu;
237 static void hardif_activate_interface(struct hard_iface *hard_iface)
239 struct bat_priv *bat_priv;
240 struct hard_iface *primary_if = NULL;
242 if (hard_iface->if_status != IF_INACTIVE)
245 bat_priv = netdev_priv(hard_iface->soft_iface);
247 update_mac_addresses(hard_iface);
248 hard_iface->if_status = IF_TO_BE_ACTIVATED;
251 * the first active interface becomes our primary interface or
252 * the next active interface after the old primay interface was removed
254 primary_if = primary_if_get_selected(bat_priv);
256 primary_if_select(bat_priv, hard_iface);
258 bat_info(hard_iface->soft_iface, "Interface activated: %s\n",
259 hard_iface->net_dev->name);
261 update_min_mtu(hard_iface->soft_iface);
265 hardif_free_ref(primary_if);
268 static void hardif_deactivate_interface(struct hard_iface *hard_iface)
270 if ((hard_iface->if_status != IF_ACTIVE) &&
271 (hard_iface->if_status != IF_TO_BE_ACTIVATED))
274 hard_iface->if_status = IF_INACTIVE;
276 bat_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
277 hard_iface->net_dev->name);
279 update_min_mtu(hard_iface->soft_iface);
282 int hardif_enable_interface(struct hard_iface *hard_iface,
283 const char *iface_name)
285 struct bat_priv *bat_priv;
286 struct batman_packet *batman_packet;
287 struct net_device *soft_iface;
290 if (hard_iface->if_status != IF_NOT_IN_USE)
293 if (!atomic_inc_not_zero(&hard_iface->refcount))
296 soft_iface = dev_get_by_name(&init_net, iface_name);
299 soft_iface = softif_create(iface_name);
306 /* dev_get_by_name() increases the reference counter for us */
307 dev_hold(soft_iface);
310 if (!softif_is_valid(soft_iface)) {
311 pr_err("Can't create batman mesh interface %s: "
312 "already exists as regular interface\n",
319 hard_iface->soft_iface = soft_iface;
320 bat_priv = netdev_priv(hard_iface->soft_iface);
321 hard_iface->packet_len = BAT_PACKET_LEN;
322 hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
324 if (!hard_iface->packet_buff) {
325 bat_err(hard_iface->soft_iface, "Can't add interface packet "
326 "(%s): out of memory\n", hard_iface->net_dev->name);
331 batman_packet = (struct batman_packet *)(hard_iface->packet_buff);
332 batman_packet->packet_type = BAT_PACKET;
333 batman_packet->version = COMPAT_VERSION;
334 batman_packet->flags = NO_FLAGS;
335 batman_packet->ttl = 2;
336 batman_packet->tq = TQ_MAX_VALUE;
337 batman_packet->tt_num_changes = 0;
338 batman_packet->ttvn = 0;
340 hard_iface->if_num = bat_priv->num_ifaces;
341 bat_priv->num_ifaces++;
342 hard_iface->if_status = IF_INACTIVE;
343 orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
345 hard_iface->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN);
346 hard_iface->batman_adv_ptype.func = batman_skb_recv;
347 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
348 dev_add_pack(&hard_iface->batman_adv_ptype);
350 atomic_set(&hard_iface->seqno, 1);
351 atomic_set(&hard_iface->frag_seqno, 1);
352 bat_info(hard_iface->soft_iface, "Adding interface: %s\n",
353 hard_iface->net_dev->name);
355 if (atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
356 ETH_DATA_LEN + BAT_HEADER_LEN)
357 bat_info(hard_iface->soft_iface,
358 "The MTU of interface %s is too small (%i) to handle "
359 "the transport of batman-adv packets. Packets going "
360 "over this interface will be fragmented on layer2 "
361 "which could impact the performance. Setting the MTU "
362 "to %zi would solve the problem.\n",
363 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
364 ETH_DATA_LEN + BAT_HEADER_LEN);
366 if (!atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu <
367 ETH_DATA_LEN + BAT_HEADER_LEN)
368 bat_info(hard_iface->soft_iface,
369 "The MTU of interface %s is too small (%i) to handle "
370 "the transport of batman-adv packets. If you experience"
371 " problems getting traffic through try increasing the "
373 hard_iface->net_dev->name, hard_iface->net_dev->mtu,
374 ETH_DATA_LEN + BAT_HEADER_LEN);
376 if (hardif_is_iface_up(hard_iface))
377 hardif_activate_interface(hard_iface);
379 bat_err(hard_iface->soft_iface, "Not using interface %s "
380 "(retrying later): interface not active\n",
381 hard_iface->net_dev->name);
383 /* begin scheduling originator messages on that interface */
384 schedule_own_packet(hard_iface);
390 hardif_free_ref(hard_iface);
394 void hardif_disable_interface(struct hard_iface *hard_iface)
396 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
397 struct hard_iface *primary_if = NULL;
399 if (hard_iface->if_status == IF_ACTIVE)
400 hardif_deactivate_interface(hard_iface);
402 if (hard_iface->if_status != IF_INACTIVE)
405 bat_info(hard_iface->soft_iface, "Removing interface: %s\n",
406 hard_iface->net_dev->name);
407 dev_remove_pack(&hard_iface->batman_adv_ptype);
409 bat_priv->num_ifaces--;
410 orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
412 primary_if = primary_if_get_selected(bat_priv);
413 if (hard_iface == primary_if) {
414 struct hard_iface *new_if;
416 new_if = hardif_get_active(hard_iface->soft_iface);
417 primary_if_select(bat_priv, new_if);
420 hardif_free_ref(new_if);
423 kfree(hard_iface->packet_buff);
424 hard_iface->packet_buff = NULL;
425 hard_iface->if_status = IF_NOT_IN_USE;
427 /* delete all references to this hard_iface */
428 purge_orig_ref(bat_priv);
429 purge_outstanding_packets(bat_priv, hard_iface);
430 dev_put(hard_iface->soft_iface);
432 /* nobody uses this interface anymore */
433 if (!bat_priv->num_ifaces)
434 softif_destroy(hard_iface->soft_iface);
436 hard_iface->soft_iface = NULL;
437 hardif_free_ref(hard_iface);
441 hardif_free_ref(primary_if);
444 static struct hard_iface *hardif_add_interface(struct net_device *net_dev)
446 struct hard_iface *hard_iface;
451 ret = is_valid_iface(net_dev);
457 hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC);
459 pr_err("Can't add interface (%s): out of memory\n",
464 ret = sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
468 hard_iface->if_num = -1;
469 hard_iface->net_dev = net_dev;
470 hard_iface->soft_iface = NULL;
471 hard_iface->if_status = IF_NOT_IN_USE;
472 INIT_LIST_HEAD(&hard_iface->list);
473 /* extra reference for return */
474 atomic_set(&hard_iface->refcount, 2);
476 check_known_mac_addr(hard_iface->net_dev);
477 list_add_tail_rcu(&hard_iface->list, &hardif_list);
489 static void hardif_remove_interface(struct hard_iface *hard_iface)
493 /* first deactivate interface */
494 if (hard_iface->if_status != IF_NOT_IN_USE)
495 hardif_disable_interface(hard_iface);
497 if (hard_iface->if_status != IF_NOT_IN_USE)
500 hard_iface->if_status = IF_TO_BE_REMOVED;
501 sysfs_del_hardif(&hard_iface->hardif_obj);
502 hardif_free_ref(hard_iface);
505 void hardif_remove_interfaces(void)
507 struct hard_iface *hard_iface, *hard_iface_tmp;
510 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
511 &hardif_list, list) {
512 list_del_rcu(&hard_iface->list);
513 hardif_remove_interface(hard_iface);
518 static int hard_if_event(struct notifier_block *this,
519 unsigned long event, void *ptr)
521 struct net_device *net_dev = ptr;
522 struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
523 struct hard_iface *primary_if = NULL;
524 struct bat_priv *bat_priv;
526 if (!hard_iface && event == NETDEV_REGISTER)
527 hard_iface = hardif_add_interface(net_dev);
534 hardif_activate_interface(hard_iface);
536 case NETDEV_GOING_DOWN:
538 hardif_deactivate_interface(hard_iface);
540 case NETDEV_UNREGISTER:
541 list_del_rcu(&hard_iface->list);
543 hardif_remove_interface(hard_iface);
545 case NETDEV_CHANGEMTU:
546 if (hard_iface->soft_iface)
547 update_min_mtu(hard_iface->soft_iface);
549 case NETDEV_CHANGEADDR:
550 if (hard_iface->if_status == IF_NOT_IN_USE)
553 check_known_mac_addr(hard_iface->net_dev);
554 update_mac_addresses(hard_iface);
556 bat_priv = netdev_priv(hard_iface->soft_iface);
557 primary_if = primary_if_get_selected(bat_priv);
561 if (hard_iface == primary_if)
562 primary_if_update_addr(bat_priv);
569 hardif_free_ref(hard_iface);
572 hardif_free_ref(primary_if);
576 /* receive a packet with the batman ethertype coming on a hard
578 static int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
579 struct packet_type *ptype,
580 struct net_device *orig_dev)
582 struct bat_priv *bat_priv;
583 struct batman_packet *batman_packet;
584 struct hard_iface *hard_iface;
587 hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
588 skb = skb_share_check(skb, GFP_ATOMIC);
590 /* skb was released by skb_share_check() */
594 /* packet should hold at least type and version */
595 if (unlikely(!pskb_may_pull(skb, 2)))
598 /* expect a valid ethernet header here. */
599 if (unlikely(skb->mac_len != sizeof(struct ethhdr)
600 || !skb_mac_header(skb)))
603 if (!hard_iface->soft_iface)
606 bat_priv = netdev_priv(hard_iface->soft_iface);
608 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
611 /* discard frames on not active interfaces */
612 if (hard_iface->if_status != IF_ACTIVE)
615 batman_packet = (struct batman_packet *)skb->data;
617 if (batman_packet->version != COMPAT_VERSION) {
618 bat_dbg(DBG_BATMAN, bat_priv,
619 "Drop packet: incompatible batman version (%i)\n",
620 batman_packet->version);
624 /* all receive handlers return whether they received or reused
625 * the supplied skb. if not, we have to free the skb. */
627 switch (batman_packet->packet_type) {
628 /* batman originator packet */
630 ret = recv_bat_packet(skb, hard_iface);
633 /* batman icmp packet */
635 ret = recv_icmp_packet(skb, hard_iface);
640 ret = recv_unicast_packet(skb, hard_iface);
643 /* fragmented unicast packet */
644 case BAT_UNICAST_FRAG:
645 ret = recv_ucast_frag_packet(skb, hard_iface);
648 /* broadcast packet */
650 ret = recv_bcast_packet(skb, hard_iface);
655 ret = recv_vis_packet(skb, hard_iface);
657 /* Translation table query (request or response) */
659 ret = recv_tt_query(skb, hard_iface);
661 /* Roaming advertisement */
663 ret = recv_roam_adv(skb, hard_iface);
669 if (ret == NET_RX_DROP)
672 /* return NET_RX_SUCCESS in any case as we
673 * most probably dropped the packet for
674 * routing-logical reasons. */
676 return NET_RX_SUCCESS;
684 struct notifier_block hard_if_notifier = {
685 .notifier_call = hard_if_event,