Commit | Line | Data |
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9cfc7bd6 | 1 | /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner, Simon Wunderlich | |
4 | * | |
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. | |
8 | * | |
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. | |
13 | * | |
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 | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
21 | #include "bat_sysfs.h" | |
22 | #include "bat_debugfs.h" | |
23 | #include "routing.h" | |
24 | #include "send.h" | |
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" | |
23721387 | 31 | #include "bridge_loop_avoidance.h" |
c6c8fea2 SE |
32 | #include "vis.h" |
33 | #include "hash.h" | |
1c280471 | 34 | #include "bat_algo.h" |
c6c8fea2 | 35 | |
c3caf519 SE |
36 | |
37 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, | |
9cfc7bd6 SE |
38 | * list traversals just rcu-locked |
39 | */ | |
3193e8fd | 40 | struct list_head batadv_hardif_list; |
ffa995e0 | 41 | static int (*recv_packet_handler[256])(struct sk_buff *, struct hard_iface *); |
3193e8fd | 42 | char batadv_routing_algo[20] = "BATMAN_IV"; |
1c280471 | 43 | static struct hlist_head bat_algo_list; |
c6c8fea2 | 44 | |
3193e8fd | 45 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 46 | |
3193e8fd | 47 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 48 | |
ffa995e0 ML |
49 | static void recv_handler_init(void); |
50 | ||
c6c8fea2 SE |
51 | static int __init batman_init(void) |
52 | { | |
3193e8fd | 53 | INIT_LIST_HEAD(&batadv_hardif_list); |
1c280471 ML |
54 | INIT_HLIST_HEAD(&bat_algo_list); |
55 | ||
ffa995e0 ML |
56 | recv_handler_init(); |
57 | ||
81c524f7 | 58 | batadv_iv_init(); |
c6c8fea2 SE |
59 | |
60 | /* the name should not be longer than 10 chars - see | |
9cfc7bd6 SE |
61 | * http://lwn.net/Articles/23634/ |
62 | */ | |
3193e8fd | 63 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 64 | |
3193e8fd | 65 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
66 | return -ENOMEM; |
67 | ||
9039dc7e | 68 | batadv_socket_init(); |
40a072d7 | 69 | batadv_debugfs_init(); |
c6c8fea2 | 70 | |
9563877e | 71 | register_netdevice_notifier(&batadv_hard_if_notifier); |
c6c8fea2 | 72 | |
86ceb360 SE |
73 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
74 | SOURCE_VERSION, COMPAT_VERSION); | |
c6c8fea2 SE |
75 | |
76 | return 0; | |
77 | } | |
78 | ||
79 | static void __exit batman_exit(void) | |
80 | { | |
40a072d7 | 81 | batadv_debugfs_destroy(); |
9563877e SE |
82 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
83 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 84 | |
3193e8fd SE |
85 | flush_workqueue(batadv_event_workqueue); |
86 | destroy_workqueue(batadv_event_workqueue); | |
87 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
88 | |
89 | rcu_barrier(); | |
90 | } | |
91 | ||
3193e8fd | 92 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 SE |
93 | { |
94 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
5346c35e | 95 | int ret; |
c6c8fea2 | 96 | |
c6c8fea2 SE |
97 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
98 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
a73105b8 AQ |
99 | spin_lock_init(&bat_priv->tt_changes_list_lock); |
100 | spin_lock_init(&bat_priv->tt_req_list_lock); | |
cc47f66e | 101 | spin_lock_init(&bat_priv->tt_roam_list_lock); |
a73105b8 | 102 | spin_lock_init(&bat_priv->tt_buff_lock); |
c6c8fea2 SE |
103 | spin_lock_init(&bat_priv->gw_list_lock); |
104 | spin_lock_init(&bat_priv->vis_hash_lock); | |
105 | spin_lock_init(&bat_priv->vis_list_lock); | |
c6c8fea2 SE |
106 | |
107 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
108 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
109 | INIT_HLIST_HEAD(&bat_priv->gw_list); | |
a73105b8 AQ |
110 | INIT_LIST_HEAD(&bat_priv->tt_changes_list); |
111 | INIT_LIST_HEAD(&bat_priv->tt_req_list); | |
cc47f66e | 112 | INIT_LIST_HEAD(&bat_priv->tt_roam_list); |
c6c8fea2 | 113 | |
7d211efc | 114 | ret = batadv_originator_init(bat_priv); |
5346c35e | 115 | if (ret < 0) |
c6c8fea2 SE |
116 | goto err; |
117 | ||
08c36d3e | 118 | ret = batadv_tt_init(bat_priv); |
5346c35e | 119 | if (ret < 0) |
c6c8fea2 SE |
120 | goto err; |
121 | ||
08c36d3e | 122 | batadv_tt_local_add(soft_iface, soft_iface->dev_addr, NULL_IFINDEX); |
c6c8fea2 | 123 | |
d0f714f4 | 124 | ret = batadv_vis_init(bat_priv); |
5346c35e | 125 | if (ret < 0) |
c6c8fea2 SE |
126 | goto err; |
127 | ||
08adf151 | 128 | ret = batadv_bla_init(bat_priv); |
5346c35e | 129 | if (ret < 0) |
23721387 SW |
130 | goto err; |
131 | ||
2265c141 | 132 | atomic_set(&bat_priv->gw_reselect, 0); |
c6c8fea2 | 133 | atomic_set(&bat_priv->mesh_state, MESH_ACTIVE); |
5346c35e SE |
134 | |
135 | return 0; | |
c6c8fea2 SE |
136 | |
137 | err: | |
3193e8fd | 138 | batadv_mesh_free(soft_iface); |
5346c35e | 139 | return ret; |
c6c8fea2 SE |
140 | } |
141 | ||
3193e8fd | 142 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 SE |
143 | { |
144 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
145 | ||
146 | atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING); | |
147 | ||
9455e34c | 148 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 149 | |
d0f714f4 | 150 | batadv_vis_quit(bat_priv); |
c6c8fea2 | 151 | |
7cf06bc6 | 152 | batadv_gw_node_purge(bat_priv); |
7d211efc | 153 | batadv_originator_free(bat_priv); |
c6c8fea2 | 154 | |
08c36d3e | 155 | batadv_tt_free(bat_priv); |
c6c8fea2 | 156 | |
08adf151 | 157 | batadv_bla_free(bat_priv); |
23721387 | 158 | |
f8214865 MH |
159 | free_percpu(bat_priv->bat_counters); |
160 | ||
c6c8fea2 SE |
161 | atomic_set(&bat_priv->mesh_state, MESH_INACTIVE); |
162 | } | |
163 | ||
3193e8fd | 164 | void batadv_inc_module_count(void) |
c6c8fea2 SE |
165 | { |
166 | try_module_get(THIS_MODULE); | |
167 | } | |
168 | ||
3193e8fd | 169 | void batadv_dec_module_count(void) |
c6c8fea2 SE |
170 | { |
171 | module_put(THIS_MODULE); | |
172 | } | |
173 | ||
3193e8fd | 174 | int batadv_is_my_mac(const uint8_t *addr) |
c6c8fea2 | 175 | { |
747e4221 | 176 | const struct hard_iface *hard_iface; |
c6c8fea2 SE |
177 | |
178 | rcu_read_lock(); | |
3193e8fd | 179 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 180 | if (hard_iface->if_status != IF_ACTIVE) |
c6c8fea2 SE |
181 | continue; |
182 | ||
e6c10f43 | 183 | if (compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
184 | rcu_read_unlock(); |
185 | return 1; | |
186 | } | |
187 | } | |
188 | rcu_read_unlock(); | |
189 | return 0; | |
c6c8fea2 SE |
190 | } |
191 | ||
ffa995e0 ML |
192 | static int recv_unhandled_packet(struct sk_buff *skb, |
193 | struct hard_iface *recv_if) | |
194 | { | |
195 | return NET_RX_DROP; | |
196 | } | |
197 | ||
198 | /* incoming packets with the batman ethertype received on any active hard | |
199 | * interface | |
200 | */ | |
3193e8fd SE |
201 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
202 | struct packet_type *ptype, | |
203 | struct net_device *orig_dev) | |
ffa995e0 ML |
204 | { |
205 | struct bat_priv *bat_priv; | |
206 | struct batman_ogm_packet *batman_ogm_packet; | |
207 | struct hard_iface *hard_iface; | |
208 | uint8_t idx; | |
209 | int ret; | |
210 | ||
211 | hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype); | |
212 | skb = skb_share_check(skb, GFP_ATOMIC); | |
213 | ||
214 | /* skb was released by skb_share_check() */ | |
215 | if (!skb) | |
216 | goto err_out; | |
217 | ||
218 | /* packet should hold at least type and version */ | |
219 | if (unlikely(!pskb_may_pull(skb, 2))) | |
220 | goto err_free; | |
221 | ||
222 | /* expect a valid ethernet header here. */ | |
223 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
224 | goto err_free; | |
225 | ||
226 | if (!hard_iface->soft_iface) | |
227 | goto err_free; | |
228 | ||
229 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
230 | ||
231 | if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) | |
232 | goto err_free; | |
233 | ||
234 | /* discard frames on not active interfaces */ | |
235 | if (hard_iface->if_status != IF_ACTIVE) | |
236 | goto err_free; | |
237 | ||
238 | batman_ogm_packet = (struct batman_ogm_packet *)skb->data; | |
239 | ||
240 | if (batman_ogm_packet->header.version != COMPAT_VERSION) { | |
241 | bat_dbg(DBG_BATMAN, bat_priv, | |
242 | "Drop packet: incompatible batman version (%i)\n", | |
243 | batman_ogm_packet->header.version); | |
244 | goto err_free; | |
245 | } | |
246 | ||
247 | /* all receive handlers return whether they received or reused | |
248 | * the supplied skb. if not, we have to free the skb. | |
249 | */ | |
250 | idx = batman_ogm_packet->header.packet_type; | |
251 | ret = (*recv_packet_handler[idx])(skb, hard_iface); | |
252 | ||
253 | if (ret == NET_RX_DROP) | |
254 | kfree_skb(skb); | |
255 | ||
256 | /* return NET_RX_SUCCESS in any case as we | |
257 | * most probably dropped the packet for | |
258 | * routing-logical reasons. | |
259 | */ | |
260 | return NET_RX_SUCCESS; | |
261 | ||
262 | err_free: | |
263 | kfree_skb(skb); | |
264 | err_out: | |
265 | return NET_RX_DROP; | |
266 | } | |
267 | ||
268 | static void recv_handler_init(void) | |
269 | { | |
270 | int i; | |
271 | ||
272 | for (i = 0; i < ARRAY_SIZE(recv_packet_handler); i++) | |
273 | recv_packet_handler[i] = recv_unhandled_packet; | |
274 | ||
ffa995e0 | 275 | /* batman icmp packet */ |
30d3c511 | 276 | recv_packet_handler[BAT_ICMP] = batadv_recv_icmp_packet; |
ffa995e0 | 277 | /* unicast packet */ |
30d3c511 | 278 | recv_packet_handler[BAT_UNICAST] = batadv_recv_unicast_packet; |
ffa995e0 | 279 | /* fragmented unicast packet */ |
30d3c511 | 280 | recv_packet_handler[BAT_UNICAST_FRAG] = batadv_recv_ucast_frag_packet; |
ffa995e0 | 281 | /* broadcast packet */ |
30d3c511 | 282 | recv_packet_handler[BAT_BCAST] = batadv_recv_bcast_packet; |
ffa995e0 | 283 | /* vis packet */ |
30d3c511 | 284 | recv_packet_handler[BAT_VIS] = batadv_recv_vis_packet; |
ffa995e0 | 285 | /* Translation table query (request or response) */ |
30d3c511 | 286 | recv_packet_handler[BAT_TT_QUERY] = batadv_recv_tt_query; |
ffa995e0 | 287 | /* Roaming advertisement */ |
30d3c511 | 288 | recv_packet_handler[BAT_ROAM_ADV] = batadv_recv_roam_adv; |
ffa995e0 ML |
289 | } |
290 | ||
3193e8fd SE |
291 | int batadv_recv_handler_register(uint8_t packet_type, |
292 | int (*recv_handler)(struct sk_buff *, | |
293 | struct hard_iface *)) | |
ffa995e0 ML |
294 | { |
295 | if (recv_packet_handler[packet_type] != &recv_unhandled_packet) | |
296 | return -EBUSY; | |
297 | ||
298 | recv_packet_handler[packet_type] = recv_handler; | |
299 | return 0; | |
300 | } | |
301 | ||
3193e8fd | 302 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 ML |
303 | { |
304 | recv_packet_handler[packet_type] = recv_unhandled_packet; | |
305 | } | |
306 | ||
1c280471 ML |
307 | static struct bat_algo_ops *bat_algo_get(char *name) |
308 | { | |
309 | struct bat_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; | |
310 | struct hlist_node *node; | |
311 | ||
312 | hlist_for_each_entry(bat_algo_ops_tmp, node, &bat_algo_list, list) { | |
313 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) | |
314 | continue; | |
315 | ||
316 | bat_algo_ops = bat_algo_ops_tmp; | |
317 | break; | |
318 | } | |
319 | ||
320 | return bat_algo_ops; | |
321 | } | |
322 | ||
3193e8fd | 323 | int batadv_algo_register(struct bat_algo_ops *bat_algo_ops) |
1c280471 ML |
324 | { |
325 | struct bat_algo_ops *bat_algo_ops_tmp; | |
5346c35e | 326 | int ret; |
1c280471 ML |
327 | |
328 | bat_algo_ops_tmp = bat_algo_get(bat_algo_ops->name); | |
329 | if (bat_algo_ops_tmp) { | |
86ceb360 SE |
330 | pr_info("Trying to register already registered routing algorithm: %s\n", |
331 | bat_algo_ops->name); | |
5346c35e | 332 | ret = -EEXIST; |
1c280471 ML |
333 | goto out; |
334 | } | |
335 | ||
01c4224b | 336 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 337 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 338 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 339 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 340 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 341 | !bat_algo_ops->bat_ogm_schedule || |
c3e29312 | 342 | !bat_algo_ops->bat_ogm_emit) { |
01c4224b ML |
343 | pr_info("Routing algo '%s' does not implement required ops\n", |
344 | bat_algo_ops->name); | |
5346c35e | 345 | ret = -EINVAL; |
01c4224b ML |
346 | goto out; |
347 | } | |
348 | ||
1c280471 ML |
349 | INIT_HLIST_NODE(&bat_algo_ops->list); |
350 | hlist_add_head(&bat_algo_ops->list, &bat_algo_list); | |
351 | ret = 0; | |
352 | ||
353 | out: | |
354 | return ret; | |
355 | } | |
356 | ||
3193e8fd | 357 | int batadv_algo_select(struct bat_priv *bat_priv, char *name) |
1c280471 ML |
358 | { |
359 | struct bat_algo_ops *bat_algo_ops; | |
5346c35e | 360 | int ret = -EINVAL; |
1c280471 ML |
361 | |
362 | bat_algo_ops = bat_algo_get(name); | |
363 | if (!bat_algo_ops) | |
364 | goto out; | |
365 | ||
366 | bat_priv->bat_algo_ops = bat_algo_ops; | |
367 | ret = 0; | |
368 | ||
369 | out: | |
370 | return ret; | |
371 | } | |
372 | ||
3193e8fd | 373 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 ML |
374 | { |
375 | struct bat_algo_ops *bat_algo_ops; | |
376 | struct hlist_node *node; | |
377 | ||
378 | seq_printf(seq, "Available routing algorithms:\n"); | |
379 | ||
380 | hlist_for_each_entry(bat_algo_ops, node, &bat_algo_list, list) { | |
381 | seq_printf(seq, "%s\n", bat_algo_ops->name); | |
382 | } | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
d419be1f ML |
387 | static int param_set_ra(const char *val, const struct kernel_param *kp) |
388 | { | |
389 | struct bat_algo_ops *bat_algo_ops; | |
d8cb5486 ML |
390 | char *algo_name = (char *)val; |
391 | size_t name_len = strlen(algo_name); | |
d419be1f | 392 | |
d8cb5486 ML |
393 | if (algo_name[name_len - 1] == '\n') |
394 | algo_name[name_len - 1] = '\0'; | |
395 | ||
396 | bat_algo_ops = bat_algo_get(algo_name); | |
d419be1f | 397 | if (!bat_algo_ops) { |
d8cb5486 | 398 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
399 | return -EINVAL; |
400 | } | |
401 | ||
d8cb5486 | 402 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
403 | } |
404 | ||
405 | static const struct kernel_param_ops param_ops_ra = { | |
406 | .set = param_set_ra, | |
407 | .get = param_get_string, | |
408 | }; | |
409 | ||
410 | static struct kparam_string __param_string_ra = { | |
3193e8fd SE |
411 | .maxlen = sizeof(batadv_routing_algo), |
412 | .string = batadv_routing_algo, | |
d419be1f ML |
413 | }; |
414 | ||
415 | module_param_cb(routing_algo, ¶m_ops_ra, &__param_string_ra, 0644); | |
c6c8fea2 SE |
416 | module_init(batman_init); |
417 | module_exit(batman_exit); | |
418 | ||
419 | MODULE_LICENSE("GPL"); | |
420 | ||
421 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
422 | MODULE_DESCRIPTION(DRIVER_DESC); | |
423 | MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE); | |
c6c8fea2 | 424 | MODULE_VERSION(SOURCE_VERSION); |