1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "originator.h"
26 #include "soft-interface.h"
27 #include "icmp_socket.h"
28 #include "translation-table.h"
29 #include "hard-interface.h"
30 #include "gateway_client.h"
31 #include "bridge_loop_avoidance.h"
37 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
38 * list traversals just rcu-locked
40 struct list_head batadv_hardif_list;
41 static int (*batadv_rx_handler[256])(struct sk_buff *,
42 struct batadv_hard_iface *);
43 char batadv_routing_algo[20] = "BATMAN_IV";
44 static struct hlist_head batadv_algo_list;
46 unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
48 struct workqueue_struct *batadv_event_workqueue;
50 static void batadv_recv_handler_init(void);
52 static int __init batadv_init(void)
54 INIT_LIST_HEAD(&batadv_hardif_list);
55 INIT_HLIST_HEAD(&batadv_algo_list);
57 batadv_recv_handler_init();
61 /* the name should not be longer than 10 chars - see
62 * http://lwn.net/Articles/23634/
64 batadv_event_workqueue = create_singlethread_workqueue("bat_events");
66 if (!batadv_event_workqueue)
70 batadv_debugfs_init();
72 register_netdevice_notifier(&batadv_hard_if_notifier);
74 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
75 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
80 static void __exit batadv_exit(void)
82 batadv_debugfs_destroy();
83 unregister_netdevice_notifier(&batadv_hard_if_notifier);
84 batadv_hardif_remove_interfaces();
86 flush_workqueue(batadv_event_workqueue);
87 destroy_workqueue(batadv_event_workqueue);
88 batadv_event_workqueue = NULL;
93 int batadv_mesh_init(struct net_device *soft_iface)
95 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
98 spin_lock_init(&bat_priv->forw_bat_list_lock);
99 spin_lock_init(&bat_priv->forw_bcast_list_lock);
100 spin_lock_init(&bat_priv->tt_changes_list_lock);
101 spin_lock_init(&bat_priv->tt_req_list_lock);
102 spin_lock_init(&bat_priv->tt_roam_list_lock);
103 spin_lock_init(&bat_priv->tt_buff_lock);
104 spin_lock_init(&bat_priv->gw_list_lock);
105 spin_lock_init(&bat_priv->vis_hash_lock);
106 spin_lock_init(&bat_priv->vis_list_lock);
108 INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
109 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
110 INIT_HLIST_HEAD(&bat_priv->gw_list);
111 INIT_LIST_HEAD(&bat_priv->tt_changes_list);
112 INIT_LIST_HEAD(&bat_priv->tt_req_list);
113 INIT_LIST_HEAD(&bat_priv->tt_roam_list);
115 ret = batadv_originator_init(bat_priv);
119 ret = batadv_tt_init(bat_priv);
123 batadv_tt_local_add(soft_iface, soft_iface->dev_addr,
124 BATADV_NULL_IFINDEX);
126 ret = batadv_vis_init(bat_priv);
130 ret = batadv_bla_init(bat_priv);
134 atomic_set(&bat_priv->gw_reselect, 0);
135 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
140 batadv_mesh_free(soft_iface);
144 void batadv_mesh_free(struct net_device *soft_iface)
146 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
148 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
150 batadv_purge_outstanding_packets(bat_priv, NULL);
152 batadv_vis_quit(bat_priv);
154 batadv_gw_node_purge(bat_priv);
155 batadv_originator_free(bat_priv);
157 batadv_tt_free(bat_priv);
159 batadv_bla_free(bat_priv);
161 free_percpu(bat_priv->bat_counters);
163 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
166 void batadv_inc_module_count(void)
168 try_module_get(THIS_MODULE);
171 void batadv_dec_module_count(void)
173 module_put(THIS_MODULE);
176 int batadv_is_my_mac(const uint8_t *addr)
178 const struct batadv_hard_iface *hard_iface;
181 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
182 if (hard_iface->if_status != BATADV_IF_ACTIVE)
185 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
194 static int batadv_recv_unhandled_packet(struct sk_buff *skb,
195 struct batadv_hard_iface *recv_if)
200 /* incoming packets with the batman ethertype received on any active hard
203 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
204 struct packet_type *ptype,
205 struct net_device *orig_dev)
207 struct batadv_priv *bat_priv;
208 struct batadv_ogm_packet *batadv_ogm_packet;
209 struct batadv_hard_iface *hard_iface;
213 hard_iface = container_of(ptype, struct batadv_hard_iface,
215 skb = skb_share_check(skb, GFP_ATOMIC);
217 /* skb was released by skb_share_check() */
221 /* packet should hold at least type and version */
222 if (unlikely(!pskb_may_pull(skb, 2)))
225 /* expect a valid ethernet header here. */
226 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
229 if (!hard_iface->soft_iface)
232 bat_priv = netdev_priv(hard_iface->soft_iface);
234 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
237 /* discard frames on not active interfaces */
238 if (hard_iface->if_status != BATADV_IF_ACTIVE)
241 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
243 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
244 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
245 "Drop packet: incompatible batman version (%i)\n",
246 batadv_ogm_packet->header.version);
250 /* all receive handlers return whether they received or reused
251 * the supplied skb. if not, we have to free the skb.
253 idx = batadv_ogm_packet->header.packet_type;
254 ret = (*batadv_rx_handler[idx])(skb, hard_iface);
256 if (ret == NET_RX_DROP)
259 /* return NET_RX_SUCCESS in any case as we
260 * most probably dropped the packet for
261 * routing-logical reasons.
263 return NET_RX_SUCCESS;
271 static void batadv_recv_handler_init(void)
275 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
276 batadv_rx_handler[i] = batadv_recv_unhandled_packet;
278 /* batman icmp packet */
279 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
281 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
282 /* fragmented unicast packet */
283 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet;
284 /* broadcast packet */
285 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
287 batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet;
288 /* Translation table query (request or response) */
289 batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query;
290 /* Roaming advertisement */
291 batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv;
295 batadv_recv_handler_register(uint8_t packet_type,
296 int (*recv_handler)(struct sk_buff *,
297 struct batadv_hard_iface *))
299 if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet)
302 batadv_rx_handler[packet_type] = recv_handler;
306 void batadv_recv_handler_unregister(uint8_t packet_type)
308 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
311 static struct batadv_algo_ops *batadv_algo_get(char *name)
313 struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
314 struct hlist_node *node;
316 hlist_for_each_entry(bat_algo_ops_tmp, node, &batadv_algo_list, list) {
317 if (strcmp(bat_algo_ops_tmp->name, name) != 0)
320 bat_algo_ops = bat_algo_ops_tmp;
327 int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
329 struct batadv_algo_ops *bat_algo_ops_tmp;
332 bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
333 if (bat_algo_ops_tmp) {
334 pr_info("Trying to register already registered routing algorithm: %s\n",
340 /* all algorithms must implement all ops (for now) */
341 if (!bat_algo_ops->bat_iface_enable ||
342 !bat_algo_ops->bat_iface_disable ||
343 !bat_algo_ops->bat_iface_update_mac ||
344 !bat_algo_ops->bat_primary_iface_set ||
345 !bat_algo_ops->bat_ogm_schedule ||
346 !bat_algo_ops->bat_ogm_emit) {
347 pr_info("Routing algo '%s' does not implement required ops\n",
353 INIT_HLIST_NODE(&bat_algo_ops->list);
354 hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
361 int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
363 struct batadv_algo_ops *bat_algo_ops;
366 bat_algo_ops = batadv_algo_get(name);
370 bat_priv->bat_algo_ops = bat_algo_ops;
377 int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
379 struct batadv_algo_ops *bat_algo_ops;
380 struct hlist_node *node;
382 seq_printf(seq, "Available routing algorithms:\n");
384 hlist_for_each_entry(bat_algo_ops, node, &batadv_algo_list, list) {
385 seq_printf(seq, "%s\n", bat_algo_ops->name);
391 static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
393 struct batadv_algo_ops *bat_algo_ops;
394 char *algo_name = (char *)val;
395 size_t name_len = strlen(algo_name);
397 if (algo_name[name_len - 1] == '\n')
398 algo_name[name_len - 1] = '\0';
400 bat_algo_ops = batadv_algo_get(algo_name);
402 pr_err("Routing algorithm '%s' is not supported\n", algo_name);
406 return param_set_copystring(algo_name, kp);
409 static const struct kernel_param_ops batadv_param_ops_ra = {
410 .set = batadv_param_set_ra,
411 .get = param_get_string,
414 static struct kparam_string batadv_param_string_ra = {
415 .maxlen = sizeof(batadv_routing_algo),
416 .string = batadv_routing_algo,
419 module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
421 module_init(batadv_init);
422 module_exit(batadv_exit);
424 MODULE_LICENSE("GPL");
426 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
427 MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
428 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
429 MODULE_VERSION(BATADV_SOURCE_VERSION);