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->priv_flags & IFF_BRIDGE_PORT)
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 = PRIMARIES_FIRST_HOP;
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 pr_warning("The newly added mac address (%pM) already exists "
154 "on: %s\n", addr, batman_if->dev);
155 pr_warning("It is strongly recommended to keep mac addresses "
156 "unique to avoid problems!\n");
161 int hardif_min_mtu(void)
163 struct batman_if *batman_if;
164 /* allow big frames if all devices are capable to do so
165 * (have MTU > 1500 + BAT_HEADER_LEN) */
166 int min_mtu = ETH_DATA_LEN;
169 list_for_each_entry_rcu(batman_if, &if_list, list) {
170 if ((batman_if->if_status == IF_ACTIVE) ||
171 (batman_if->if_status == IF_TO_BE_ACTIVATED))
172 min_mtu = MIN(batman_if->net_dev->mtu - BAT_HEADER_LEN,
180 /* adjusts the MTU if a new interface with a smaller MTU appeared. */
181 void update_min_mtu(void)
185 min_mtu = hardif_min_mtu();
186 if (soft_device->mtu != min_mtu)
187 soft_device->mtu = min_mtu;
190 static void hardif_activate_interface(struct net_device *net_dev,
191 struct bat_priv *bat_priv,
192 struct batman_if *batman_if)
194 if (batman_if->if_status != IF_INACTIVE)
197 dev_hold(batman_if->net_dev);
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 dev_put(batman_if->net_dev);
227 batman_if->if_status = IF_INACTIVE;
229 bat_info(net_dev, "Interface deactivated: %s\n", batman_if->dev);
234 int hardif_enable_interface(struct batman_if *batman_if)
236 /* FIXME: each batman_if will be attached to a softif */
237 struct bat_priv *bat_priv = netdev_priv(soft_device);
238 struct batman_packet *batman_packet;
240 if (batman_if->if_status != IF_NOT_IN_USE)
243 batman_if->packet_len = BAT_PACKET_LEN;
244 batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_ATOMIC);
246 if (!batman_if->packet_buff) {
247 bat_err(soft_device, "Can't add interface packet (%s): "
248 "out of memory\n", batman_if->dev);
252 batman_packet = (struct batman_packet *)(batman_if->packet_buff);
253 batman_packet->packet_type = BAT_PACKET;
254 batman_packet->version = COMPAT_VERSION;
255 batman_packet->flags = 0;
256 batman_packet->ttl = 2;
257 batman_packet->tq = TQ_MAX_VALUE;
258 batman_packet->num_hna = 0;
260 batman_if->if_num = bat_priv->num_ifaces;
261 bat_priv->num_ifaces++;
262 batman_if->if_status = IF_INACTIVE;
263 orig_hash_add_if(batman_if, bat_priv->num_ifaces);
265 atomic_set(&batman_if->seqno, 1);
266 bat_info(soft_device, "Adding interface: %s\n", batman_if->dev);
268 if (hardif_is_iface_up(batman_if))
269 hardif_activate_interface(soft_device, bat_priv, batman_if);
271 bat_err(soft_device, "Not using interface %s "
272 "(retrying later): interface not active\n",
275 /* begin scheduling originator messages on that interface */
276 schedule_own_packet(batman_if);
285 void hardif_disable_interface(struct batman_if *batman_if)
287 /* FIXME: each batman_if will be attached to a softif */
288 struct bat_priv *bat_priv = netdev_priv(soft_device);
290 if (batman_if->if_status == IF_ACTIVE)
291 hardif_deactivate_interface(soft_device, batman_if);
293 if (batman_if->if_status != IF_INACTIVE)
296 bat_info(soft_device, "Removing interface: %s\n", batman_if->dev);
297 bat_priv->num_ifaces--;
298 orig_hash_del_if(batman_if, bat_priv->num_ifaces);
300 if (batman_if == bat_priv->primary_if)
301 set_primary_if(bat_priv, get_active_batman_if());
303 kfree(batman_if->packet_buff);
304 batman_if->packet_buff = NULL;
305 batman_if->if_status = IF_NOT_IN_USE;
307 if ((atomic_read(&module_state) == MODULE_ACTIVE) &&
308 (bat_priv->num_ifaces == 0))
312 static struct batman_if *hardif_add_interface(struct net_device *net_dev)
314 struct batman_if *batman_if;
317 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 INIT_LIST_HEAD(&batman_if->list);
341 check_known_mac_addr(batman_if->net_dev->dev_addr);
342 list_add_tail_rcu(&batman_if->list, &if_list);
346 kfree(batman_if->dev);
353 static void hardif_free_interface(struct rcu_head *rcu)
355 struct batman_if *batman_if = container_of(rcu, struct batman_if, rcu);
357 /* delete all references to this batman_if */
359 purge_outstanding_packets(batman_if);
361 kfree(batman_if->dev);
365 static void hardif_remove_interface(struct batman_if *batman_if)
367 /* first deactivate interface */
368 if (batman_if->if_status != IF_NOT_IN_USE)
369 hardif_disable_interface(batman_if);
371 if (batman_if->if_status != IF_NOT_IN_USE)
374 batman_if->if_status = IF_TO_BE_REMOVED;
375 list_del_rcu(&batman_if->list);
376 sysfs_del_hardif(&batman_if->hardif_obj);
377 call_rcu(&batman_if->rcu, hardif_free_interface);
380 void hardif_remove_interfaces(void)
382 struct batman_if *batman_if, *batman_if_tmp;
384 list_for_each_entry_safe(batman_if, batman_if_tmp, &if_list, list)
385 hardif_remove_interface(batman_if);
388 static int hard_if_event(struct notifier_block *this,
389 unsigned long event, void *ptr)
391 struct net_device *net_dev = (struct net_device *)ptr;
392 struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
393 /* FIXME: each batman_if will be attached to a softif */
394 struct bat_priv *bat_priv = netdev_priv(soft_device);
397 batman_if = hardif_add_interface(net_dev);
403 case NETDEV_REGISTER:
406 hardif_activate_interface(soft_device, bat_priv, batman_if);
408 case NETDEV_GOING_DOWN:
410 hardif_deactivate_interface(soft_device, batman_if);
412 case NETDEV_UNREGISTER:
413 hardif_remove_interface(batman_if);
415 case NETDEV_CHANGENAME:
417 case NETDEV_CHANGEADDR:
418 check_known_mac_addr(batman_if->net_dev->dev_addr);
419 update_mac_addresses(batman_if);
420 if (batman_if == bat_priv->primary_if)
421 set_primary_if(bat_priv, batman_if);
431 static int batman_skb_recv_finish(struct sk_buff *skb)
436 /* receive a packet with the batman ethertype coming on a hard
438 int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
439 struct packet_type *ptype, struct net_device *orig_dev)
441 /* FIXME: each orig_node->batman_if will be attached to a softif */
442 struct bat_priv *bat_priv = netdev_priv(soft_device);
443 struct batman_packet *batman_packet;
444 struct batman_if *batman_if;
445 struct net_device_stats *stats;
446 struct rtnl_link_stats64 temp;
449 skb = skb_share_check(skb, GFP_ATOMIC);
451 /* skb was released by skb_share_check() */
455 if (atomic_read(&module_state) != MODULE_ACTIVE)
458 /* if netfilter/ebtables wants to block incoming batman
459 * packets then give them a chance to do so here */
460 ret = NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, dev, NULL,
461 batman_skb_recv_finish);
465 /* packet should hold at least type and version */
466 if (unlikely(skb_headlen(skb) < 2))
469 /* expect a valid ethernet header here. */
470 if (unlikely(skb->mac_len != sizeof(struct ethhdr)
471 || !skb_mac_header(skb)))
474 batman_if = get_batman_if_by_netdev(skb->dev);
478 /* discard frames on not active interfaces */
479 if (batman_if->if_status != IF_ACTIVE)
482 stats = (struct net_device_stats *)dev_get_stats(skb->dev, &temp);
485 stats->rx_bytes += skb->len;
488 batman_packet = (struct batman_packet *)skb->data;
490 if (batman_packet->version != COMPAT_VERSION) {
491 bat_dbg(DBG_BATMAN, bat_priv,
492 "Drop packet: incompatible batman version (%i)\n",
493 batman_packet->version);
497 /* all receive handlers return whether they received or reused
498 * the supplied skb. if not, we have to free the skb. */
500 switch (batman_packet->packet_type) {
501 /* batman originator packet */
503 ret = recv_bat_packet(skb, batman_if);
506 /* batman icmp packet */
508 ret = recv_icmp_packet(skb);
513 ret = recv_unicast_packet(skb, batman_if);
516 /* broadcast packet */
518 ret = recv_bcast_packet(skb);
523 ret = recv_vis_packet(skb);
529 if (ret == NET_RX_DROP)
532 /* return NET_RX_SUCCESS in any case as we
533 * most probably dropped the packet for
534 * routing-logical reasons. */
536 return NET_RX_SUCCESS;
544 struct notifier_block hard_if_notifier = {
545 .notifier_call = hard_if_event,