1 /* Copyright (C) 2007-2013 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
20 #include <linux/crc32c.h>
21 #include <linux/highmem.h>
27 #include "originator.h"
28 #include "soft-interface.h"
29 #include "icmp_socket.h"
30 #include "translation-table.h"
31 #include "hard-interface.h"
32 #include "gateway_client.h"
33 #include "bridge_loop_avoidance.h"
34 #include "distributed-arp-table.h"
40 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
41 * list traversals just rcu-locked
43 struct list_head batadv_hardif_list;
44 static int (*batadv_rx_handler[256])(struct sk_buff *,
45 struct batadv_hard_iface *);
46 char batadv_routing_algo[20] = "BATMAN_IV";
47 static struct hlist_head batadv_algo_list;
49 unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
51 struct workqueue_struct *batadv_event_workqueue;
53 static void batadv_recv_handler_init(void);
55 static int __init batadv_init(void)
57 INIT_LIST_HEAD(&batadv_hardif_list);
58 INIT_HLIST_HEAD(&batadv_algo_list);
60 batadv_recv_handler_init();
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.last_changeset_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 ret = batadv_dat_init(bat_priv);
138 atomic_set(&bat_priv->gw.reselect, 0);
139 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
144 batadv_mesh_free(soft_iface);
148 void batadv_mesh_free(struct net_device *soft_iface)
150 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
152 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
154 batadv_purge_outstanding_packets(bat_priv, NULL);
156 batadv_vis_quit(bat_priv);
158 batadv_gw_node_purge(bat_priv);
159 batadv_originator_free(bat_priv);
161 batadv_tt_free(bat_priv);
163 batadv_bla_free(bat_priv);
165 batadv_dat_free(bat_priv);
167 free_percpu(bat_priv->bat_counters);
169 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
172 int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr)
174 const struct batadv_hard_iface *hard_iface;
177 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
178 if (hard_iface->if_status != BATADV_IF_ACTIVE)
181 if (hard_iface->soft_iface != bat_priv->soft_iface)
184 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
194 * batadv_seq_print_text_primary_if_get - called from debugfs table printing
195 * function that requires the primary interface
196 * @seq: debugfs table seq_file struct
198 * Returns primary interface if found or NULL otherwise.
200 struct batadv_hard_iface *
201 batadv_seq_print_text_primary_if_get(struct seq_file *seq)
203 struct net_device *net_dev = (struct net_device *)seq->private;
204 struct batadv_priv *bat_priv = netdev_priv(net_dev);
205 struct batadv_hard_iface *primary_if;
207 primary_if = batadv_primary_if_get_selected(bat_priv);
211 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
216 if (primary_if->if_status == BATADV_IF_ACTIVE)
220 "BATMAN mesh %s disabled - primary interface not active\n",
222 batadv_hardif_free_ref(primary_if);
229 static int batadv_recv_unhandled_packet(struct sk_buff *skb,
230 struct batadv_hard_iface *recv_if)
235 /* incoming packets with the batman ethertype received on any active hard
238 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
239 struct packet_type *ptype,
240 struct net_device *orig_dev)
242 struct batadv_priv *bat_priv;
243 struct batadv_ogm_packet *batadv_ogm_packet;
244 struct batadv_hard_iface *hard_iface;
248 hard_iface = container_of(ptype, struct batadv_hard_iface,
250 skb = skb_share_check(skb, GFP_ATOMIC);
252 /* skb was released by skb_share_check() */
256 /* packet should hold at least type and version */
257 if (unlikely(!pskb_may_pull(skb, 2)))
260 /* expect a valid ethernet header here. */
261 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
264 if (!hard_iface->soft_iface)
267 bat_priv = netdev_priv(hard_iface->soft_iface);
269 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
272 /* discard frames on not active interfaces */
273 if (hard_iface->if_status != BATADV_IF_ACTIVE)
276 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
278 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
279 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
280 "Drop packet: incompatible batman version (%i)\n",
281 batadv_ogm_packet->header.version);
285 /* all receive handlers return whether they received or reused
286 * the supplied skb. if not, we have to free the skb.
288 idx = batadv_ogm_packet->header.packet_type;
289 ret = (*batadv_rx_handler[idx])(skb, hard_iface);
291 if (ret == NET_RX_DROP)
294 /* return NET_RX_SUCCESS in any case as we
295 * most probably dropped the packet for
296 * routing-logical reasons.
298 return NET_RX_SUCCESS;
306 static void batadv_recv_handler_init(void)
310 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
311 batadv_rx_handler[i] = batadv_recv_unhandled_packet;
313 /* batman icmp packet */
314 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
315 /* unicast with 4 addresses packet */
316 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
318 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
319 /* fragmented unicast packet */
320 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet;
321 /* broadcast packet */
322 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
324 batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet;
325 /* Translation table query (request or response) */
326 batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query;
327 /* Roaming advertisement */
328 batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv;
332 batadv_recv_handler_register(uint8_t packet_type,
333 int (*recv_handler)(struct sk_buff *,
334 struct batadv_hard_iface *))
336 if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet)
339 batadv_rx_handler[packet_type] = recv_handler;
343 void batadv_recv_handler_unregister(uint8_t packet_type)
345 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
348 static struct batadv_algo_ops *batadv_algo_get(char *name)
350 struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
352 hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) {
353 if (strcmp(bat_algo_ops_tmp->name, name) != 0)
356 bat_algo_ops = bat_algo_ops_tmp;
363 int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
365 struct batadv_algo_ops *bat_algo_ops_tmp;
368 bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
369 if (bat_algo_ops_tmp) {
370 pr_info("Trying to register already registered routing algorithm: %s\n",
376 /* all algorithms must implement all ops (for now) */
377 if (!bat_algo_ops->bat_iface_enable ||
378 !bat_algo_ops->bat_iface_disable ||
379 !bat_algo_ops->bat_iface_update_mac ||
380 !bat_algo_ops->bat_primary_iface_set ||
381 !bat_algo_ops->bat_ogm_schedule ||
382 !bat_algo_ops->bat_ogm_emit) {
383 pr_info("Routing algo '%s' does not implement required ops\n",
389 INIT_HLIST_NODE(&bat_algo_ops->list);
390 hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
397 int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
399 struct batadv_algo_ops *bat_algo_ops;
402 bat_algo_ops = batadv_algo_get(name);
406 bat_priv->bat_algo_ops = bat_algo_ops;
413 int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
415 struct batadv_algo_ops *bat_algo_ops;
417 seq_printf(seq, "Available routing algorithms:\n");
419 hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
420 seq_printf(seq, "%s\n", bat_algo_ops->name);
427 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
429 * @skb: skb pointing to fragmented socket buffers
430 * @payload_ptr: Pointer to position inside the head buffer of the skb
431 * marking the start of the data to be CRC'ed
433 * payload_ptr must always point to an address in the skb head buffer and not to
436 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
440 unsigned int to = skb->len;
441 struct skb_seq_state st;
444 unsigned int consumed = 0;
446 from = (unsigned int)(payload_ptr - skb->data);
448 skb_prepare_seq_read(skb, from, to, &st);
449 while ((len = skb_seq_read(consumed, &data, &st)) != 0) {
450 crc = crc32c(crc, data, len);
453 skb_abort_seq_read(&st);
458 static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
460 struct batadv_algo_ops *bat_algo_ops;
461 char *algo_name = (char *)val;
462 size_t name_len = strlen(algo_name);
464 if (algo_name[name_len - 1] == '\n')
465 algo_name[name_len - 1] = '\0';
467 bat_algo_ops = batadv_algo_get(algo_name);
469 pr_err("Routing algorithm '%s' is not supported\n", algo_name);
473 return param_set_copystring(algo_name, kp);
476 static const struct kernel_param_ops batadv_param_ops_ra = {
477 .set = batadv_param_set_ra,
478 .get = param_get_string,
481 static struct kparam_string batadv_param_string_ra = {
482 .maxlen = sizeof(batadv_routing_algo),
483 .string = batadv_routing_algo,
486 module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
488 module_init(batadv_init);
489 module_exit(batadv_exit);
491 MODULE_LICENSE("GPL");
493 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
494 MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
495 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
496 MODULE_VERSION(BATADV_SOURCE_VERSION);