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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; |
ee11ad61 SE |
41 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
42 | struct hard_iface *); | |
3193e8fd | 43 | char batadv_routing_algo[20] = "BATMAN_IV"; |
ee11ad61 | 44 | static struct hlist_head batadv_algo_list; |
c6c8fea2 | 45 | |
3193e8fd | 46 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 47 | |
3193e8fd | 48 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 49 | |
ee11ad61 | 50 | static void batadv_recv_handler_init(void); |
ffa995e0 | 51 | |
ee11ad61 | 52 | static int __init batadv_init(void) |
c6c8fea2 | 53 | { |
3193e8fd | 54 | INIT_LIST_HEAD(&batadv_hardif_list); |
ee11ad61 | 55 | INIT_HLIST_HEAD(&batadv_algo_list); |
1c280471 | 56 | |
ee11ad61 | 57 | batadv_recv_handler_init(); |
ffa995e0 | 58 | |
81c524f7 | 59 | batadv_iv_init(); |
c6c8fea2 SE |
60 | |
61 | /* the name should not be longer than 10 chars - see | |
9cfc7bd6 SE |
62 | * http://lwn.net/Articles/23634/ |
63 | */ | |
3193e8fd | 64 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 65 | |
3193e8fd | 66 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
67 | return -ENOMEM; |
68 | ||
9039dc7e | 69 | batadv_socket_init(); |
40a072d7 | 70 | batadv_debugfs_init(); |
c6c8fea2 | 71 | |
9563877e | 72 | register_netdevice_notifier(&batadv_hard_if_notifier); |
c6c8fea2 | 73 | |
86ceb360 | 74 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
7e071c79 | 75 | SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
76 | |
77 | return 0; | |
78 | } | |
79 | ||
ee11ad61 | 80 | static void __exit batadv_exit(void) |
c6c8fea2 | 81 | { |
40a072d7 | 82 | batadv_debugfs_destroy(); |
9563877e SE |
83 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
84 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 85 | |
3193e8fd SE |
86 | flush_workqueue(batadv_event_workqueue); |
87 | destroy_workqueue(batadv_event_workqueue); | |
88 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
89 | |
90 | rcu_barrier(); | |
91 | } | |
92 | ||
3193e8fd | 93 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 SE |
94 | { |
95 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
5346c35e | 96 | int ret; |
c6c8fea2 | 97 | |
c6c8fea2 SE |
98 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
99 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
a73105b8 AQ |
100 | spin_lock_init(&bat_priv->tt_changes_list_lock); |
101 | spin_lock_init(&bat_priv->tt_req_list_lock); | |
cc47f66e | 102 | spin_lock_init(&bat_priv->tt_roam_list_lock); |
a73105b8 | 103 | spin_lock_init(&bat_priv->tt_buff_lock); |
c6c8fea2 SE |
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); | |
c6c8fea2 SE |
107 | |
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); | |
a73105b8 AQ |
111 | INIT_LIST_HEAD(&bat_priv->tt_changes_list); |
112 | INIT_LIST_HEAD(&bat_priv->tt_req_list); | |
cc47f66e | 113 | INIT_LIST_HEAD(&bat_priv->tt_roam_list); |
c6c8fea2 | 114 | |
7d211efc | 115 | ret = batadv_originator_init(bat_priv); |
5346c35e | 116 | if (ret < 0) |
c6c8fea2 SE |
117 | goto err; |
118 | ||
08c36d3e | 119 | ret = batadv_tt_init(bat_priv); |
5346c35e | 120 | if (ret < 0) |
c6c8fea2 SE |
121 | goto err; |
122 | ||
08c36d3e | 123 | batadv_tt_local_add(soft_iface, soft_iface->dev_addr, NULL_IFINDEX); |
c6c8fea2 | 124 | |
d0f714f4 | 125 | ret = batadv_vis_init(bat_priv); |
5346c35e | 126 | if (ret < 0) |
c6c8fea2 SE |
127 | goto err; |
128 | ||
08adf151 | 129 | ret = batadv_bla_init(bat_priv); |
5346c35e | 130 | if (ret < 0) |
23721387 SW |
131 | goto err; |
132 | ||
2265c141 | 133 | atomic_set(&bat_priv->gw_reselect, 0); |
c6c8fea2 | 134 | atomic_set(&bat_priv->mesh_state, MESH_ACTIVE); |
5346c35e SE |
135 | |
136 | return 0; | |
c6c8fea2 SE |
137 | |
138 | err: | |
3193e8fd | 139 | batadv_mesh_free(soft_iface); |
5346c35e | 140 | return ret; |
c6c8fea2 SE |
141 | } |
142 | ||
3193e8fd | 143 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 SE |
144 | { |
145 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
146 | ||
147 | atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING); | |
148 | ||
9455e34c | 149 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 150 | |
d0f714f4 | 151 | batadv_vis_quit(bat_priv); |
c6c8fea2 | 152 | |
7cf06bc6 | 153 | batadv_gw_node_purge(bat_priv); |
7d211efc | 154 | batadv_originator_free(bat_priv); |
c6c8fea2 | 155 | |
08c36d3e | 156 | batadv_tt_free(bat_priv); |
c6c8fea2 | 157 | |
08adf151 | 158 | batadv_bla_free(bat_priv); |
23721387 | 159 | |
f8214865 MH |
160 | free_percpu(bat_priv->bat_counters); |
161 | ||
c6c8fea2 SE |
162 | atomic_set(&bat_priv->mesh_state, MESH_INACTIVE); |
163 | } | |
164 | ||
3193e8fd | 165 | void batadv_inc_module_count(void) |
c6c8fea2 SE |
166 | { |
167 | try_module_get(THIS_MODULE); | |
168 | } | |
169 | ||
3193e8fd | 170 | void batadv_dec_module_count(void) |
c6c8fea2 SE |
171 | { |
172 | module_put(THIS_MODULE); | |
173 | } | |
174 | ||
3193e8fd | 175 | int batadv_is_my_mac(const uint8_t *addr) |
c6c8fea2 | 176 | { |
747e4221 | 177 | const struct hard_iface *hard_iface; |
c6c8fea2 SE |
178 | |
179 | rcu_read_lock(); | |
3193e8fd | 180 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 181 | if (hard_iface->if_status != IF_ACTIVE) |
c6c8fea2 SE |
182 | continue; |
183 | ||
1eda58bf | 184 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
185 | rcu_read_unlock(); |
186 | return 1; | |
187 | } | |
188 | } | |
189 | rcu_read_unlock(); | |
190 | return 0; | |
c6c8fea2 SE |
191 | } |
192 | ||
ee11ad61 SE |
193 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
194 | struct hard_iface *recv_if) | |
ffa995e0 ML |
195 | { |
196 | return NET_RX_DROP; | |
197 | } | |
198 | ||
199 | /* incoming packets with the batman ethertype received on any active hard | |
200 | * interface | |
201 | */ | |
3193e8fd SE |
202 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
203 | struct packet_type *ptype, | |
204 | struct net_device *orig_dev) | |
ffa995e0 ML |
205 | { |
206 | struct bat_priv *bat_priv; | |
207 | struct batman_ogm_packet *batman_ogm_packet; | |
208 | struct hard_iface *hard_iface; | |
209 | uint8_t idx; | |
210 | int ret; | |
211 | ||
212 | hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype); | |
213 | skb = skb_share_check(skb, GFP_ATOMIC); | |
214 | ||
215 | /* skb was released by skb_share_check() */ | |
216 | if (!skb) | |
217 | goto err_out; | |
218 | ||
219 | /* packet should hold at least type and version */ | |
220 | if (unlikely(!pskb_may_pull(skb, 2))) | |
221 | goto err_free; | |
222 | ||
223 | /* expect a valid ethernet header here. */ | |
224 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
225 | goto err_free; | |
226 | ||
227 | if (!hard_iface->soft_iface) | |
228 | goto err_free; | |
229 | ||
230 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
231 | ||
232 | if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) | |
233 | goto err_free; | |
234 | ||
235 | /* discard frames on not active interfaces */ | |
236 | if (hard_iface->if_status != IF_ACTIVE) | |
237 | goto err_free; | |
238 | ||
239 | batman_ogm_packet = (struct batman_ogm_packet *)skb->data; | |
240 | ||
7e071c79 | 241 | if (batman_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
1eda58bf SE |
242 | batadv_dbg(DBG_BATMAN, bat_priv, |
243 | "Drop packet: incompatible batman version (%i)\n", | |
244 | batman_ogm_packet->header.version); | |
ffa995e0 ML |
245 | goto err_free; |
246 | } | |
247 | ||
248 | /* all receive handlers return whether they received or reused | |
249 | * the supplied skb. if not, we have to free the skb. | |
250 | */ | |
251 | idx = batman_ogm_packet->header.packet_type; | |
ee11ad61 | 252 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
253 | |
254 | if (ret == NET_RX_DROP) | |
255 | kfree_skb(skb); | |
256 | ||
257 | /* return NET_RX_SUCCESS in any case as we | |
258 | * most probably dropped the packet for | |
259 | * routing-logical reasons. | |
260 | */ | |
261 | return NET_RX_SUCCESS; | |
262 | ||
263 | err_free: | |
264 | kfree_skb(skb); | |
265 | err_out: | |
266 | return NET_RX_DROP; | |
267 | } | |
268 | ||
ee11ad61 | 269 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
270 | { |
271 | int i; | |
272 | ||
ee11ad61 SE |
273 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
274 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 275 | |
ffa995e0 | 276 | /* batman icmp packet */ |
ee11ad61 | 277 | batadv_rx_handler[BAT_ICMP] = batadv_recv_icmp_packet; |
ffa995e0 | 278 | /* unicast packet */ |
ee11ad61 | 279 | batadv_rx_handler[BAT_UNICAST] = batadv_recv_unicast_packet; |
ffa995e0 | 280 | /* fragmented unicast packet */ |
ee11ad61 | 281 | batadv_rx_handler[BAT_UNICAST_FRAG] = batadv_recv_ucast_frag_packet; |
ffa995e0 | 282 | /* broadcast packet */ |
ee11ad61 | 283 | batadv_rx_handler[BAT_BCAST] = batadv_recv_bcast_packet; |
ffa995e0 | 284 | /* vis packet */ |
ee11ad61 | 285 | batadv_rx_handler[BAT_VIS] = batadv_recv_vis_packet; |
ffa995e0 | 286 | /* Translation table query (request or response) */ |
ee11ad61 | 287 | batadv_rx_handler[BAT_TT_QUERY] = batadv_recv_tt_query; |
ffa995e0 | 288 | /* Roaming advertisement */ |
ee11ad61 | 289 | batadv_rx_handler[BAT_ROAM_ADV] = batadv_recv_roam_adv; |
ffa995e0 ML |
290 | } |
291 | ||
3193e8fd SE |
292 | int batadv_recv_handler_register(uint8_t packet_type, |
293 | int (*recv_handler)(struct sk_buff *, | |
294 | struct hard_iface *)) | |
ffa995e0 | 295 | { |
ee11ad61 | 296 | if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet) |
ffa995e0 ML |
297 | return -EBUSY; |
298 | ||
ee11ad61 | 299 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
300 | return 0; |
301 | } | |
302 | ||
3193e8fd | 303 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 304 | { |
ee11ad61 | 305 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
306 | } |
307 | ||
ee11ad61 | 308 | static struct bat_algo_ops *batadv_algo_get(char *name) |
1c280471 ML |
309 | { |
310 | struct bat_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; | |
311 | struct hlist_node *node; | |
312 | ||
ee11ad61 | 313 | hlist_for_each_entry(bat_algo_ops_tmp, node, &batadv_algo_list, list) { |
1c280471 ML |
314 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
315 | continue; | |
316 | ||
317 | bat_algo_ops = bat_algo_ops_tmp; | |
318 | break; | |
319 | } | |
320 | ||
321 | return bat_algo_ops; | |
322 | } | |
323 | ||
3193e8fd | 324 | int batadv_algo_register(struct bat_algo_ops *bat_algo_ops) |
1c280471 ML |
325 | { |
326 | struct bat_algo_ops *bat_algo_ops_tmp; | |
5346c35e | 327 | int ret; |
1c280471 | 328 | |
ee11ad61 | 329 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 330 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
331 | pr_info("Trying to register already registered routing algorithm: %s\n", |
332 | bat_algo_ops->name); | |
5346c35e | 333 | ret = -EEXIST; |
1c280471 ML |
334 | goto out; |
335 | } | |
336 | ||
01c4224b | 337 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 338 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 339 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 340 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 341 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 342 | !bat_algo_ops->bat_ogm_schedule || |
c3e29312 | 343 | !bat_algo_ops->bat_ogm_emit) { |
01c4224b ML |
344 | pr_info("Routing algo '%s' does not implement required ops\n", |
345 | bat_algo_ops->name); | |
5346c35e | 346 | ret = -EINVAL; |
01c4224b ML |
347 | goto out; |
348 | } | |
349 | ||
1c280471 | 350 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 351 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 ML |
352 | ret = 0; |
353 | ||
354 | out: | |
355 | return ret; | |
356 | } | |
357 | ||
3193e8fd | 358 | int batadv_algo_select(struct bat_priv *bat_priv, char *name) |
1c280471 ML |
359 | { |
360 | struct bat_algo_ops *bat_algo_ops; | |
5346c35e | 361 | int ret = -EINVAL; |
1c280471 | 362 | |
ee11ad61 | 363 | bat_algo_ops = batadv_algo_get(name); |
1c280471 ML |
364 | if (!bat_algo_ops) |
365 | goto out; | |
366 | ||
367 | bat_priv->bat_algo_ops = bat_algo_ops; | |
368 | ret = 0; | |
369 | ||
370 | out: | |
371 | return ret; | |
372 | } | |
373 | ||
3193e8fd | 374 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 ML |
375 | { |
376 | struct bat_algo_ops *bat_algo_ops; | |
377 | struct hlist_node *node; | |
378 | ||
379 | seq_printf(seq, "Available routing algorithms:\n"); | |
380 | ||
ee11ad61 | 381 | hlist_for_each_entry(bat_algo_ops, node, &batadv_algo_list, list) { |
1c280471 ML |
382 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
383 | } | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
ee11ad61 | 388 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f ML |
389 | { |
390 | struct bat_algo_ops *bat_algo_ops; | |
d8cb5486 ML |
391 | char *algo_name = (char *)val; |
392 | size_t name_len = strlen(algo_name); | |
d419be1f | 393 | |
d8cb5486 ML |
394 | if (algo_name[name_len - 1] == '\n') |
395 | algo_name[name_len - 1] = '\0'; | |
396 | ||
ee11ad61 | 397 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 398 | if (!bat_algo_ops) { |
d8cb5486 | 399 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
400 | return -EINVAL; |
401 | } | |
402 | ||
d8cb5486 | 403 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
404 | } |
405 | ||
ee11ad61 SE |
406 | static const struct kernel_param_ops batadv_param_ops_ra = { |
407 | .set = batadv_param_set_ra, | |
d419be1f ML |
408 | .get = param_get_string, |
409 | }; | |
410 | ||
ee11ad61 | 411 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
412 | .maxlen = sizeof(batadv_routing_algo), |
413 | .string = batadv_routing_algo, | |
d419be1f ML |
414 | }; |
415 | ||
ee11ad61 SE |
416 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
417 | 0644); | |
418 | module_init(batadv_init); | |
419 | module_exit(batadv_exit); | |
c6c8fea2 SE |
420 | |
421 | MODULE_LICENSE("GPL"); | |
422 | ||
423 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
424 | MODULE_DESCRIPTION(DRIVER_DESC); | |
425 | MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE); | |
c6c8fea2 | 426 | MODULE_VERSION(SOURCE_VERSION); |