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>
33 #include <linux/netfilter_bridge.h>
35 #define MIN(x, y) ((x) < (y) ? (x) : (y))
37 struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev)
39 struct batman_if *batman_if;
42 list_for_each_entry_rcu(batman_if, &if_list, list) {
43 if (batman_if->net_dev == net_dev)
54 static int is_valid_iface(struct net_device *net_dev)
56 if (net_dev->flags & IFF_LOOPBACK)
59 if (net_dev->type != ARPHRD_ETHER)
62 if (net_dev->addr_len != ETH_ALEN)
65 /* no batman over batman */
66 #ifdef HAVE_NET_DEVICE_OPS
67 if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
70 if (net_dev->hard_start_xmit == interface_tx)
74 /* Device is being bridged */
75 /* if (net_dev->br_port != NULL)
81 static struct batman_if *get_active_batman_if(void)
83 struct batman_if *batman_if;
85 /* TODO: should check interfaces belonging to bat_priv */
87 list_for_each_entry_rcu(batman_if, &if_list, list) {
88 if (batman_if->if_status == IF_ACTIVE)
99 static void set_primary_if(struct bat_priv *bat_priv,
100 struct batman_if *batman_if)
102 struct batman_packet *batman_packet;
104 bat_priv->primary_if = batman_if;
106 if (!bat_priv->primary_if)
109 set_main_if_addr(batman_if->net_dev->dev_addr);
111 batman_packet = (struct batman_packet *)(batman_if->packet_buff);
112 batman_packet->flags = 0;
113 batman_packet->ttl = TTL;
116 * hacky trick to make sure that we send the HNA information via
117 * our new primary interface
119 atomic_set(&hna_local_changed, 1);
122 static bool hardif_is_iface_up(struct batman_if *batman_if)
124 if (batman_if->net_dev->flags & IFF_UP)
130 static void update_mac_addresses(struct batman_if *batman_if)
132 addr_to_string(batman_if->addr_str, batman_if->net_dev->dev_addr);
134 memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig,
135 batman_if->net_dev->dev_addr, ETH_ALEN);
136 memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender,
137 batman_if->net_dev->dev_addr, ETH_ALEN);
140 static void check_known_mac_addr(uint8_t *addr)
142 struct batman_if *batman_if;
145 list_for_each_entry_rcu(batman_if, &if_list, list) {
146 if ((batman_if->if_status != IF_ACTIVE) &&
147 (batman_if->if_status != IF_TO_BE_ACTIVATED))
150 if (!compare_orig(batman_if->net_dev->dev_addr, addr))
153 printk(KERN_WARNING "batman-adv:"
154 "The newly added mac address (%pM) already exists on: %s\n",
155 addr, batman_if->dev);
156 printk(KERN_WARNING "batman-adv:"
157 "It is strongly recommended to keep mac addresses unique"
158 "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 bat_priv *bat_priv,
193 struct batman_if *batman_if)
195 if (batman_if->if_status != IF_INACTIVE)
198 dev_hold(batman_if->net_dev);
200 update_mac_addresses(batman_if);
201 batman_if->if_status = IF_TO_BE_ACTIVATED;
204 * the first active interface becomes our primary interface or
205 * the next active interface after the old primay interface was removed
207 if (!bat_priv->primary_if)
208 set_primary_if(bat_priv, batman_if);
210 printk(KERN_INFO "batman-adv:Interface activated: %s\n",
213 if (atomic_read(&module_state) == MODULE_INACTIVE)
220 static void hardif_deactivate_interface(struct batman_if *batman_if)
222 if ((batman_if->if_status != IF_ACTIVE) &&
223 (batman_if->if_status != IF_TO_BE_ACTIVATED))
226 dev_put(batman_if->net_dev);
228 batman_if->if_status = IF_INACTIVE;
230 printk(KERN_INFO "batman-adv:Interface deactivated: %s\n",
236 int hardif_enable_interface(struct batman_if *batman_if)
238 /* FIXME: each batman_if will be attached to a softif */
239 struct bat_priv *bat_priv = netdev_priv(soft_device);
240 struct batman_packet *batman_packet;
242 if (batman_if->if_status != IF_NOT_IN_USE)
245 batman_if->packet_len = BAT_PACKET_LEN;
246 batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_ATOMIC);
248 if (!batman_if->packet_buff) {
249 printk(KERN_ERR "batman-adv:"
250 "Can't add interface packet (%s): out of memory\n",
255 batman_packet = (struct batman_packet *)(batman_if->packet_buff);
256 batman_packet->packet_type = BAT_PACKET;
257 batman_packet->version = COMPAT_VERSION;
258 batman_packet->flags = 0;
259 batman_packet->ttl = 2;
260 batman_packet->tq = TQ_MAX_VALUE;
261 batman_packet->num_hna = 0;
263 batman_if->if_num = bat_priv->num_ifaces;
264 bat_priv->num_ifaces++;
265 batman_if->if_status = IF_INACTIVE;
266 orig_hash_add_if(batman_if, bat_priv->num_ifaces);
268 atomic_set(&batman_if->seqno, 1);
269 printk(KERN_INFO "batman-adv:Adding interface: %s\n", batman_if->dev);
271 if (hardif_is_iface_up(batman_if))
272 hardif_activate_interface(bat_priv, batman_if);
274 printk(KERN_ERR "batman-adv:"
275 "Not using interface %s "
276 "(retrying later): interface not active\n",
279 /* begin scheduling originator messages on that interface */
280 schedule_own_packet(batman_if);
289 void hardif_disable_interface(struct batman_if *batman_if)
291 /* FIXME: each batman_if will be attached to a softif */
292 struct bat_priv *bat_priv = netdev_priv(soft_device);
294 if (batman_if->if_status == IF_ACTIVE)
295 hardif_deactivate_interface(batman_if);
297 if (batman_if->if_status != IF_INACTIVE)
300 printk(KERN_INFO "batman-adv:Removing interface: %s\n", batman_if->dev);
301 bat_priv->num_ifaces--;
302 orig_hash_del_if(batman_if, bat_priv->num_ifaces);
304 if (batman_if == bat_priv->primary_if)
305 set_primary_if(bat_priv, get_active_batman_if());
307 kfree(batman_if->packet_buff);
308 batman_if->packet_buff = NULL;
309 batman_if->if_status = IF_NOT_IN_USE;
311 if ((atomic_read(&module_state) == MODULE_ACTIVE) &&
312 (bat_priv->num_ifaces == 0))
316 static struct batman_if *hardif_add_interface(struct net_device *net_dev)
318 struct batman_if *batman_if;
321 ret = is_valid_iface(net_dev);
325 batman_if = kmalloc(sizeof(struct batman_if), GFP_ATOMIC);
327 printk(KERN_ERR "batman-adv:"
328 "Can't add interface (%s): out of memory\n",
333 batman_if->dev = kstrdup(net_dev->name, GFP_ATOMIC);
337 ret = sysfs_add_hardif(&batman_if->hardif_obj, net_dev);
341 batman_if->if_num = -1;
342 batman_if->net_dev = net_dev;
343 batman_if->if_status = IF_NOT_IN_USE;
344 INIT_LIST_HEAD(&batman_if->list);
346 check_known_mac_addr(batman_if->net_dev->dev_addr);
347 list_add_tail_rcu(&batman_if->list, &if_list);
351 kfree(batman_if->dev);
358 static void hardif_free_interface(struct rcu_head *rcu)
360 struct batman_if *batman_if = container_of(rcu, struct batman_if, rcu);
362 /* delete all references to this batman_if */
364 purge_outstanding_packets(batman_if);
366 kfree(batman_if->dev);
370 static void hardif_remove_interface(struct batman_if *batman_if)
372 /* first deactivate interface */
373 if (batman_if->if_status != IF_NOT_IN_USE)
374 hardif_disable_interface(batman_if);
376 if (batman_if->if_status != IF_NOT_IN_USE)
379 batman_if->if_status = IF_TO_BE_REMOVED;
380 list_del_rcu(&batman_if->list);
381 sysfs_del_hardif(&batman_if->hardif_obj);
382 call_rcu(&batman_if->rcu, hardif_free_interface);
385 void hardif_remove_interfaces(void)
387 struct batman_if *batman_if, *batman_if_tmp;
389 list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list)
390 hardif_remove_interface(batman_if);
393 static int hard_if_event(struct notifier_block *this,
394 unsigned long event, void *ptr)
396 struct net_device *net_dev = (struct net_device *)ptr;
397 struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
398 /* FIXME: each batman_if will be attached to a softif */
399 struct bat_priv *bat_priv = netdev_priv(soft_device);
402 batman_if = hardif_add_interface(net_dev);
408 case NETDEV_REGISTER:
411 hardif_activate_interface(bat_priv, batman_if);
413 case NETDEV_GOING_DOWN:
415 hardif_deactivate_interface(batman_if);
417 case NETDEV_UNREGISTER:
418 hardif_remove_interface(batman_if);
420 case NETDEV_CHANGENAME:
422 case NETDEV_CHANGEADDR:
423 check_known_mac_addr(batman_if->net_dev->dev_addr);
424 update_mac_addresses(batman_if);
425 if (batman_if == bat_priv->primary_if)
426 set_primary_if(bat_priv, batman_if);
436 static int batman_skb_recv_finish(struct sk_buff *skb)
441 /* receive a packet with the batman ethertype coming on a hard
443 int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
444 struct packet_type *ptype, struct net_device *orig_dev)
446 struct batman_packet *batman_packet;
447 struct batman_if *batman_if;
448 struct net_device_stats *stats;
451 skb = skb_share_check(skb, GFP_ATOMIC);
453 /* skb was released by skb_share_check() */
457 if (atomic_read(&module_state) != MODULE_ACTIVE)
460 /* if netfilter/ebtables wants to block incoming batman
461 * packets then give them a chance to do so here */
462 ret = NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, dev, NULL,
463 batman_skb_recv_finish);
467 /* packet should hold at least type and version */
468 if (unlikely(skb_headlen(skb) < 2))
471 /* expect a valid ethernet header here. */
472 if (unlikely(skb->mac_len != sizeof(struct ethhdr)
473 || !skb_mac_header(skb)))
476 batman_if = get_batman_if_by_netdev(skb->dev);
480 /* discard frames on not active interfaces */
481 if (batman_if->if_status != IF_ACTIVE)
484 stats = (struct net_device_stats *)dev_get_stats(skb->dev);
487 stats->rx_bytes += skb->len;
490 batman_packet = (struct batman_packet *)skb->data;
492 if (batman_packet->version != COMPAT_VERSION) {
494 "Drop packet: incompatible batman version (%i)\n",
495 batman_packet->version);
499 /* all receive handlers return whether they received or reused
500 * the supplied skb. if not, we have to free the skb. */
502 switch (batman_packet->packet_type) {
503 /* batman originator packet */
505 ret = recv_bat_packet(skb, batman_if);
508 /* batman icmp packet */
510 ret = recv_icmp_packet(skb);
515 ret = recv_unicast_packet(skb);
518 /* broadcast packet */
520 ret = recv_bcast_packet(skb);
525 ret = recv_vis_packet(skb);
531 if (ret == NET_RX_DROP)
534 /* return NET_RX_SUCCESS in any case as we
535 * most probably dropped the packet for
536 * routing-logical reasons. */
538 return NET_RX_SUCCESS;
546 struct notifier_block hard_if_notifier = {
547 .notifier_call = hard_if_event,