2 * Copyright (C) 2007-2010 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 #define MIN(x, y) ((x) < (y) ? (x) : (y))
36 struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev)
38 struct batman_if *batman_if;
41 list_for_each_entry_rcu(batman_if, &if_list, list) {
42 if (batman_if->net_dev == net_dev)
53 static int is_valid_iface(struct net_device *net_dev)
55 if (net_dev->flags & IFF_LOOPBACK)
58 if (net_dev->type != ARPHRD_ETHER)
61 if (net_dev->addr_len != ETH_ALEN)
64 /* no batman over batman */
65 #ifdef HAVE_NET_DEVICE_OPS
66 if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
69 if (net_dev->hard_start_xmit == interface_tx)
73 /* Device is being bridged */
74 /* if (net_dev->priv_flags & IFF_BRIDGE_PORT)
80 static struct batman_if *get_active_batman_if(void)
82 struct batman_if *batman_if;
84 /* TODO: should check interfaces belonging to bat_priv */
86 list_for_each_entry_rcu(batman_if, &if_list, list) {
87 if (batman_if->if_status == IF_ACTIVE)
98 static void set_primary_if(struct bat_priv *bat_priv,
99 struct batman_if *batman_if)
101 struct batman_packet *batman_packet;
103 bat_priv->primary_if = batman_if;
105 if (!bat_priv->primary_if)
108 set_main_if_addr(batman_if->net_dev->dev_addr);
110 batman_packet = (struct batman_packet *)(batman_if->packet_buff);
111 batman_packet->flags = PRIMARIES_FIRST_HOP;
112 batman_packet->ttl = TTL;
115 * hacky trick to make sure that we send the HNA information via
116 * our new primary interface
118 atomic_set(&hna_local_changed, 1);
121 static bool hardif_is_iface_up(struct batman_if *batman_if)
123 if (batman_if->net_dev->flags & IFF_UP)
129 static void update_mac_addresses(struct batman_if *batman_if)
131 if (!batman_if || !batman_if->packet_buff)
134 addr_to_string(batman_if->addr_str, batman_if->net_dev->dev_addr);
136 memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig,
137 batman_if->net_dev->dev_addr, ETH_ALEN);
138 memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender,
139 batman_if->net_dev->dev_addr, ETH_ALEN);
142 static void check_known_mac_addr(uint8_t *addr)
144 struct batman_if *batman_if;
147 list_for_each_entry_rcu(batman_if, &if_list, list) {
148 if ((batman_if->if_status != IF_ACTIVE) &&
149 (batman_if->if_status != IF_TO_BE_ACTIVATED))
152 if (!compare_orig(batman_if->net_dev->dev_addr, addr))
155 pr_warning("The newly added mac address (%pM) already exists "
156 "on: %s\n", addr, batman_if->dev);
157 pr_warning("It is strongly recommended to keep mac addresses "
158 "unique to avoid problems!\n");
163 int hardif_min_mtu(void)
165 struct batman_if *batman_if;
166 /* allow big frames if all devices are capable to do so
167 * (have MTU > 1500 + BAT_HEADER_LEN) */
168 int min_mtu = ETH_DATA_LEN;
171 list_for_each_entry_rcu(batman_if, &if_list, list) {
172 if ((batman_if->if_status == IF_ACTIVE) ||
173 (batman_if->if_status == IF_TO_BE_ACTIVATED))
174 min_mtu = MIN(batman_if->net_dev->mtu - BAT_HEADER_LEN,
182 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
183 void update_min_mtu(void)
187 min_mtu = hardif_min_mtu();
188 if (soft_device->mtu != min_mtu)
189 soft_device->mtu = min_mtu;
192 static void hardif_activate_interface(struct net_device *net_dev,
193 struct bat_priv *bat_priv,
194 struct batman_if *batman_if)
196 if (batman_if->if_status != IF_INACTIVE)
199 update_mac_addresses(batman_if);
200 batman_if->if_status = IF_TO_BE_ACTIVATED;
203 * the first active interface becomes our primary interface or
204 * the next active interface after the old primay interface was removed
206 if (!bat_priv->primary_if)
207 set_primary_if(bat_priv, batman_if);
209 bat_info(net_dev, "Interface activated: %s\n", batman_if->dev);
211 if (atomic_read(&module_state) == MODULE_INACTIVE)
218 static void hardif_deactivate_interface(struct net_device *net_dev,
219 struct batman_if *batman_if)
221 if ((batman_if->if_status != IF_ACTIVE) &&
222 (batman_if->if_status != IF_TO_BE_ACTIVATED))
225 batman_if->if_status = IF_INACTIVE;
227 bat_info(net_dev, "Interface deactivated: %s\n", batman_if->dev);
232 int hardif_enable_interface(struct batman_if *batman_if)
234 /* FIXME: each batman_if will be attached to a softif */
235 struct bat_priv *bat_priv = netdev_priv(soft_device);
236 struct batman_packet *batman_packet;
238 if (batman_if->if_status != IF_NOT_IN_USE)
241 batman_if->packet_len = BAT_PACKET_LEN;
242 batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_ATOMIC);
244 if (!batman_if->packet_buff) {
245 bat_err(soft_device, "Can't add interface packet (%s): "
246 "out of memory\n", batman_if->dev);
250 batman_packet = (struct batman_packet *)(batman_if->packet_buff);
251 batman_packet->packet_type = BAT_PACKET;
252 batman_packet->version = COMPAT_VERSION;
253 batman_packet->flags = 0;
254 batman_packet->ttl = 2;
255 batman_packet->tq = TQ_MAX_VALUE;
256 batman_packet->num_hna = 0;
258 batman_if->if_num = bat_priv->num_ifaces;
259 bat_priv->num_ifaces++;
260 batman_if->if_status = IF_INACTIVE;
261 orig_hash_add_if(batman_if, bat_priv->num_ifaces);
263 atomic_set(&batman_if->seqno, 1);
264 bat_info(soft_device, "Adding interface: %s\n", batman_if->dev);
266 if (hardif_is_iface_up(batman_if))
267 hardif_activate_interface(soft_device, bat_priv, batman_if);
269 bat_err(soft_device, "Not using interface %s "
270 "(retrying later): interface not active\n",
273 /* begin scheduling originator messages on that interface */
274 schedule_own_packet(batman_if);
283 void hardif_disable_interface(struct batman_if *batman_if)
285 /* FIXME: each batman_if will be attached to a softif */
286 struct bat_priv *bat_priv = netdev_priv(soft_device);
288 if (batman_if->if_status == IF_ACTIVE)
289 hardif_deactivate_interface(soft_device, batman_if);
291 if (batman_if->if_status != IF_INACTIVE)
294 bat_info(soft_device, "Removing interface: %s\n", batman_if->dev);
295 bat_priv->num_ifaces--;
296 orig_hash_del_if(batman_if, bat_priv->num_ifaces);
298 if (batman_if == bat_priv->primary_if)
299 set_primary_if(bat_priv, get_active_batman_if());
301 kfree(batman_if->packet_buff);
302 batman_if->packet_buff = NULL;
303 batman_if->if_status = IF_NOT_IN_USE;
305 if ((atomic_read(&module_state) == MODULE_ACTIVE) &&
306 (bat_priv->num_ifaces == 0))
310 static struct batman_if *hardif_add_interface(struct net_device *net_dev)
312 struct batman_if *batman_if;
315 ret = is_valid_iface(net_dev);
321 batman_if = kmalloc(sizeof(struct batman_if), GFP_ATOMIC);
323 pr_err("Can't add interface (%s): out of memory\n",
328 batman_if->dev = kstrdup(net_dev->name, GFP_ATOMIC);
332 ret = sysfs_add_hardif(&batman_if->hardif_obj, net_dev);
336 batman_if->if_num = -1;
337 batman_if->net_dev = net_dev;
338 batman_if->if_status = IF_NOT_IN_USE;
339 batman_if->packet_buff = NULL;
340 INIT_LIST_HEAD(&batman_if->list);
342 check_known_mac_addr(batman_if->net_dev->dev_addr);
343 list_add_tail_rcu(&batman_if->list, &if_list);
347 kfree(batman_if->dev);
356 static void hardif_free_interface(struct rcu_head *rcu)
358 struct batman_if *batman_if = container_of(rcu, struct batman_if, rcu);
360 /* delete all references to this batman_if */
362 purge_outstanding_packets(batman_if);
364 kfree(batman_if->dev);
368 static void hardif_remove_interface(struct batman_if *batman_if)
370 /* first deactivate interface */
371 if (batman_if->if_status != IF_NOT_IN_USE)
372 hardif_disable_interface(batman_if);
374 if (batman_if->if_status != IF_NOT_IN_USE)
377 batman_if->if_status = IF_TO_BE_REMOVED;
378 list_del_rcu(&batman_if->list);
379 sysfs_del_hardif(&batman_if->hardif_obj);
380 dev_put(batman_if->net_dev);
381 call_rcu(&batman_if->rcu, hardif_free_interface);
384 void hardif_remove_interfaces(void)
386 struct batman_if *batman_if, *batman_if_tmp;
388 list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list)
389 hardif_remove_interface(batman_if);
392 static int hard_if_event(struct notifier_block *this,
393 unsigned long event, void *ptr)
395 struct net_device *net_dev = (struct net_device *)ptr;
396 struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
397 /* FIXME: each batman_if will be attached to a softif */
398 struct bat_priv *bat_priv = netdev_priv(soft_device);
400 if (!batman_if && event == NETDEV_REGISTER)
401 batman_if = hardif_add_interface(net_dev);
408 hardif_activate_interface(soft_device, bat_priv, batman_if);
410 case NETDEV_GOING_DOWN:
412 hardif_deactivate_interface(soft_device, batman_if);
414 case NETDEV_UNREGISTER:
415 hardif_remove_interface(batman_if);
417 case NETDEV_CHANGENAME:
419 case NETDEV_CHANGEADDR:
420 check_known_mac_addr(batman_if->net_dev->dev_addr);
421 update_mac_addresses(batman_if);
422 if (batman_if == bat_priv->primary_if)
423 set_primary_if(bat_priv, batman_if);
433 /* receive a packet with the batman ethertype coming on a hard
435 int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
436 struct packet_type *ptype, struct net_device *orig_dev)
438 /* FIXME: each orig_node->batman_if will be attached to a softif */
439 struct bat_priv *bat_priv = netdev_priv(soft_device);
440 struct batman_packet *batman_packet;
441 struct batman_if *batman_if;
444 skb = skb_share_check(skb, GFP_ATOMIC);
446 /* skb was released by skb_share_check() */
450 if (atomic_read(&module_state) != MODULE_ACTIVE)
453 /* packet should hold at least type and version */
454 if (unlikely(skb_headlen(skb) < 2))
457 /* expect a valid ethernet header here. */
458 if (unlikely(skb->mac_len != sizeof(struct ethhdr)
459 || !skb_mac_header(skb)))
462 batman_if = get_batman_if_by_netdev(skb->dev);
466 /* discard frames on not active interfaces */
467 if (batman_if->if_status != IF_ACTIVE)
470 batman_packet = (struct batman_packet *)skb->data;
472 if (batman_packet->version != COMPAT_VERSION) {
473 bat_dbg(DBG_BATMAN, bat_priv,
474 "Drop packet: incompatible batman version (%i)\n",
475 batman_packet->version);
479 /* all receive handlers return whether they received or reused
480 * the supplied skb. if not, we have to free the skb. */
482 switch (batman_packet->packet_type) {
483 /* batman originator packet */
485 ret = recv_bat_packet(skb, batman_if);
488 /* batman icmp packet */
490 ret = recv_icmp_packet(skb);
495 ret = recv_unicast_packet(skb, batman_if);
498 /* broadcast packet */
500 ret = recv_bcast_packet(skb);
505 ret = recv_vis_packet(skb);
511 if (ret == NET_RX_DROP)
514 /* return NET_RX_SUCCESS in any case as we
515 * most probably dropped the packet for
516 * routing-logical reasons. */
518 return NET_RX_SUCCESS;
526 struct notifier_block hard_if_notifier = {
527 .notifier_call = hard_if_event,