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20#include <linux/crc32c.h>
21#include <linux/highmem.h>
22#include "main.h"
23#include "sysfs.h"
24#include "debugfs.h"
25#include "routing.h"
26#include "send.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"
35#include "vis.h"
36#include "hash.h"
37#include "bat_algo.h"
38#include "network-coding.h"
39
40
41
42
43
44struct list_head batadv_hardif_list;
45static int (*batadv_rx_handler[256])(struct sk_buff *,
46 struct batadv_hard_iface *);
47char batadv_routing_algo[20] = "BATMAN_IV";
48static struct hlist_head batadv_algo_list;
49
50unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
51
52struct workqueue_struct *batadv_event_workqueue;
53
54static void batadv_recv_handler_init(void);
55
56static int __init batadv_init(void)
57{
58 INIT_LIST_HEAD(&batadv_hardif_list);
59 INIT_HLIST_HEAD(&batadv_algo_list);
60
61 batadv_recv_handler_init();
62
63 batadv_iv_init();
64
65 batadv_event_workqueue = create_singlethread_workqueue("bat_events");
66
67 if (!batadv_event_workqueue)
68 return -ENOMEM;
69
70 batadv_socket_init();
71 batadv_debugfs_init();
72
73 register_netdevice_notifier(&batadv_hard_if_notifier);
74 rtnl_link_register(&batadv_link_ops);
75
76 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
77 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
78
79 return 0;
80}
81
82static void __exit batadv_exit(void)
83{
84 batadv_debugfs_destroy();
85 rtnl_link_unregister(&batadv_link_ops);
86 unregister_netdevice_notifier(&batadv_hard_if_notifier);
87 batadv_hardif_remove_interfaces();
88
89 flush_workqueue(batadv_event_workqueue);
90 destroy_workqueue(batadv_event_workqueue);
91 batadv_event_workqueue = NULL;
92
93 rcu_barrier();
94}
95
96int batadv_mesh_init(struct net_device *soft_iface)
97{
98 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
99 int ret;
100
101 spin_lock_init(&bat_priv->forw_bat_list_lock);
102 spin_lock_init(&bat_priv->forw_bcast_list_lock);
103 spin_lock_init(&bat_priv->tt.changes_list_lock);
104 spin_lock_init(&bat_priv->tt.req_list_lock);
105 spin_lock_init(&bat_priv->tt.roam_list_lock);
106 spin_lock_init(&bat_priv->tt.last_changeset_lock);
107 spin_lock_init(&bat_priv->gw.list_lock);
108 spin_lock_init(&bat_priv->vis.hash_lock);
109 spin_lock_init(&bat_priv->vis.list_lock);
110
111 INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
112 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
113 INIT_HLIST_HEAD(&bat_priv->gw.list);
114 INIT_LIST_HEAD(&bat_priv->tt.changes_list);
115 INIT_LIST_HEAD(&bat_priv->tt.req_list);
116 INIT_LIST_HEAD(&bat_priv->tt.roam_list);
117
118 ret = batadv_originator_init(bat_priv);
119 if (ret < 0)
120 goto err;
121
122 ret = batadv_tt_init(bat_priv);
123 if (ret < 0)
124 goto err;
125
126 batadv_tt_local_add(soft_iface, soft_iface->dev_addr,
127 BATADV_NULL_IFINDEX);
128
129 ret = batadv_vis_init(bat_priv);
130 if (ret < 0)
131 goto err;
132
133 ret = batadv_bla_init(bat_priv);
134 if (ret < 0)
135 goto err;
136
137 ret = batadv_dat_init(bat_priv);
138 if (ret < 0)
139 goto err;
140
141 ret = batadv_nc_init(bat_priv);
142 if (ret < 0)
143 goto err;
144
145 atomic_set(&bat_priv->gw.reselect, 0);
146 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
147
148 return 0;
149
150err:
151 batadv_mesh_free(soft_iface);
152 return ret;
153}
154
155void batadv_mesh_free(struct net_device *soft_iface)
156{
157 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
158
159 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
160
161 batadv_purge_outstanding_packets(bat_priv, NULL);
162
163 batadv_vis_quit(bat_priv);
164
165 batadv_gw_node_purge(bat_priv);
166 batadv_nc_free(bat_priv);
167 batadv_dat_free(bat_priv);
168 batadv_bla_free(bat_priv);
169
170
171
172
173
174 batadv_tt_free(bat_priv);
175
176
177
178
179
180
181 batadv_originator_free(bat_priv);
182
183 free_percpu(bat_priv->bat_counters);
184 bat_priv->bat_counters = NULL;
185
186 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
187}
188
189
190
191
192
193
194
195int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr)
196{
197 const struct batadv_hard_iface *hard_iface;
198
199 rcu_read_lock();
200 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
201 if (hard_iface->if_status != BATADV_IF_ACTIVE)
202 continue;
203
204 if (hard_iface->soft_iface != bat_priv->soft_iface)
205 continue;
206
207 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
208 rcu_read_unlock();
209 return 1;
210 }
211 }
212 rcu_read_unlock();
213 return 0;
214}
215
216
217
218
219
220
221
222
223struct batadv_hard_iface *
224batadv_seq_print_text_primary_if_get(struct seq_file *seq)
225{
226 struct net_device *net_dev = (struct net_device *)seq->private;
227 struct batadv_priv *bat_priv = netdev_priv(net_dev);
228 struct batadv_hard_iface *primary_if;
229
230 primary_if = batadv_primary_if_get_selected(bat_priv);
231
232 if (!primary_if) {
233 seq_printf(seq,
234 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
235 net_dev->name);
236 goto out;
237 }
238
239 if (primary_if->if_status == BATADV_IF_ACTIVE)
240 goto out;
241
242 seq_printf(seq,
243 "BATMAN mesh %s disabled - primary interface not active\n",
244 net_dev->name);
245 batadv_hardif_free_ref(primary_if);
246 primary_if = NULL;
247
248out:
249 return primary_if;
250}
251
252static int batadv_recv_unhandled_packet(struct sk_buff *skb,
253 struct batadv_hard_iface *recv_if)
254{
255 return NET_RX_DROP;
256}
257
258
259
260
261int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
262 struct packet_type *ptype,
263 struct net_device *orig_dev)
264{
265 struct batadv_priv *bat_priv;
266 struct batadv_ogm_packet *batadv_ogm_packet;
267 struct batadv_hard_iface *hard_iface;
268 uint8_t idx;
269 int ret;
270
271 hard_iface = container_of(ptype, struct batadv_hard_iface,
272 batman_adv_ptype);
273 skb = skb_share_check(skb, GFP_ATOMIC);
274
275
276 if (!skb)
277 goto err_out;
278
279
280 if (unlikely(!pskb_may_pull(skb, 2)))
281 goto err_free;
282
283
284 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
285 goto err_free;
286
287 if (!hard_iface->soft_iface)
288 goto err_free;
289
290 bat_priv = netdev_priv(hard_iface->soft_iface);
291
292 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
293 goto err_free;
294
295
296 if (hard_iface->if_status != BATADV_IF_ACTIVE)
297 goto err_free;
298
299 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
300
301 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
302 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
303 "Drop packet: incompatible batman version (%i)\n",
304 batadv_ogm_packet->header.version);
305 goto err_free;
306 }
307
308
309
310
311 idx = batadv_ogm_packet->header.packet_type;
312 ret = (*batadv_rx_handler[idx])(skb, hard_iface);
313
314 if (ret == NET_RX_DROP)
315 kfree_skb(skb);
316
317
318
319
320
321 return NET_RX_SUCCESS;
322
323err_free:
324 kfree_skb(skb);
325err_out:
326 return NET_RX_DROP;
327}
328
329static void batadv_recv_handler_init(void)
330{
331 int i;
332
333 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
334 batadv_rx_handler[i] = batadv_recv_unhandled_packet;
335
336
337 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
338
339 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
340
341 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
342
343 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet;
344
345 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
346
347 batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet;
348
349 batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query;
350
351 batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv;
352}
353
354int
355batadv_recv_handler_register(uint8_t packet_type,
356 int (*recv_handler)(struct sk_buff *,
357 struct batadv_hard_iface *))
358{
359 if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet)
360 return -EBUSY;
361
362 batadv_rx_handler[packet_type] = recv_handler;
363 return 0;
364}
365
366void batadv_recv_handler_unregister(uint8_t packet_type)
367{
368 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
369}
370
371static struct batadv_algo_ops *batadv_algo_get(char *name)
372{
373 struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
374
375 hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) {
376 if (strcmp(bat_algo_ops_tmp->name, name) != 0)
377 continue;
378
379 bat_algo_ops = bat_algo_ops_tmp;
380 break;
381 }
382
383 return bat_algo_ops;
384}
385
386int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
387{
388 struct batadv_algo_ops *bat_algo_ops_tmp;
389 int ret;
390
391 bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
392 if (bat_algo_ops_tmp) {
393 pr_info("Trying to register already registered routing algorithm: %s\n",
394 bat_algo_ops->name);
395 ret = -EEXIST;
396 goto out;
397 }
398
399
400 if (!bat_algo_ops->bat_iface_enable ||
401 !bat_algo_ops->bat_iface_disable ||
402 !bat_algo_ops->bat_iface_update_mac ||
403 !bat_algo_ops->bat_primary_iface_set ||
404 !bat_algo_ops->bat_ogm_schedule ||
405 !bat_algo_ops->bat_ogm_emit) {
406 pr_info("Routing algo '%s' does not implement required ops\n",
407 bat_algo_ops->name);
408 ret = -EINVAL;
409 goto out;
410 }
411
412 INIT_HLIST_NODE(&bat_algo_ops->list);
413 hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
414 ret = 0;
415
416out:
417 return ret;
418}
419
420int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
421{
422 struct batadv_algo_ops *bat_algo_ops;
423 int ret = -EINVAL;
424
425 bat_algo_ops = batadv_algo_get(name);
426 if (!bat_algo_ops)
427 goto out;
428
429 bat_priv->bat_algo_ops = bat_algo_ops;
430 ret = 0;
431
432out:
433 return ret;
434}
435
436int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
437{
438 struct batadv_algo_ops *bat_algo_ops;
439
440 seq_puts(seq, "Available routing algorithms:\n");
441
442 hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
443 seq_printf(seq, "%s\n", bat_algo_ops->name);
444 }
445
446 return 0;
447}
448
449
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457
458
459__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
460{
461 u32 crc = 0;
462 unsigned int from;
463 unsigned int to = skb->len;
464 struct skb_seq_state st;
465 const u8 *data;
466 unsigned int len;
467 unsigned int consumed = 0;
468
469 from = (unsigned int)(payload_ptr - skb->data);
470
471 skb_prepare_seq_read(skb, from, to, &st);
472 while ((len = skb_seq_read(consumed, &data, &st)) != 0) {
473 crc = crc32c(crc, data, len);
474 consumed += len;
475 }
476
477 return htonl(crc);
478}
479
480static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
481{
482 struct batadv_algo_ops *bat_algo_ops;
483 char *algo_name = (char *)val;
484 size_t name_len = strlen(algo_name);
485
486 if (name_len > 0 && algo_name[name_len - 1] == '\n')
487 algo_name[name_len - 1] = '\0';
488
489 bat_algo_ops = batadv_algo_get(algo_name);
490 if (!bat_algo_ops) {
491 pr_err("Routing algorithm '%s' is not supported\n", algo_name);
492 return -EINVAL;
493 }
494
495 return param_set_copystring(algo_name, kp);
496}
497
498static const struct kernel_param_ops batadv_param_ops_ra = {
499 .set = batadv_param_set_ra,
500 .get = param_get_string,
501};
502
503static struct kparam_string batadv_param_string_ra = {
504 .maxlen = sizeof(batadv_routing_algo),
505 .string = batadv_routing_algo,
506};
507
508module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
509 0644);
510module_init(batadv_init);
511module_exit(batadv_exit);
512
513MODULE_LICENSE("GPL");
514
515MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
516MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
517MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
518MODULE_VERSION(BATADV_SOURCE_VERSION);
519