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" | |
b706b13b SE |
21 | #include "sysfs.h" |
22 | #include "debugfs.h" | |
c6c8fea2 SE |
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 | 41 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
56303d34 | 42 | struct batadv_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 | 60 | |
3193e8fd | 61 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 62 | |
3193e8fd | 63 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
64 | return -ENOMEM; |
65 | ||
9039dc7e | 66 | batadv_socket_init(); |
40a072d7 | 67 | batadv_debugfs_init(); |
c6c8fea2 | 68 | |
9563877e | 69 | register_netdevice_notifier(&batadv_hard_if_notifier); |
c6c8fea2 | 70 | |
86ceb360 | 71 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 72 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
73 | |
74 | return 0; | |
75 | } | |
76 | ||
ee11ad61 | 77 | static void __exit batadv_exit(void) |
c6c8fea2 | 78 | { |
40a072d7 | 79 | batadv_debugfs_destroy(); |
9563877e SE |
80 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
81 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 82 | |
3193e8fd SE |
83 | flush_workqueue(batadv_event_workqueue); |
84 | destroy_workqueue(batadv_event_workqueue); | |
85 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
86 | |
87 | rcu_barrier(); | |
88 | } | |
89 | ||
3193e8fd | 90 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 91 | { |
56303d34 | 92 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 93 | int ret; |
c6c8fea2 | 94 | |
c6c8fea2 SE |
95 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
96 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
97 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
98 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
99 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
100 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
101 | spin_lock_init(&bat_priv->gw.list_lock); | |
102 | spin_lock_init(&bat_priv->vis.hash_lock); | |
103 | spin_lock_init(&bat_priv->vis.list_lock); | |
c6c8fea2 SE |
104 | |
105 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
106 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 SE |
107 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
108 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); | |
109 | INIT_LIST_HEAD(&bat_priv->tt.req_list); | |
110 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); | |
c6c8fea2 | 111 | |
7d211efc | 112 | ret = batadv_originator_init(bat_priv); |
5346c35e | 113 | if (ret < 0) |
c6c8fea2 SE |
114 | goto err; |
115 | ||
08c36d3e | 116 | ret = batadv_tt_init(bat_priv); |
5346c35e | 117 | if (ret < 0) |
c6c8fea2 SE |
118 | goto err; |
119 | ||
42d0b044 SE |
120 | batadv_tt_local_add(soft_iface, soft_iface->dev_addr, |
121 | BATADV_NULL_IFINDEX); | |
c6c8fea2 | 122 | |
d0f714f4 | 123 | ret = batadv_vis_init(bat_priv); |
5346c35e | 124 | if (ret < 0) |
c6c8fea2 SE |
125 | goto err; |
126 | ||
08adf151 | 127 | ret = batadv_bla_init(bat_priv); |
5346c35e | 128 | if (ret < 0) |
23721387 SW |
129 | goto err; |
130 | ||
807736f6 | 131 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 132 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
133 | |
134 | return 0; | |
c6c8fea2 SE |
135 | |
136 | err: | |
3193e8fd | 137 | batadv_mesh_free(soft_iface); |
5346c35e | 138 | return ret; |
c6c8fea2 SE |
139 | } |
140 | ||
3193e8fd | 141 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 142 | { |
56303d34 | 143 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 144 | |
39c75a51 | 145 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 146 | |
9455e34c | 147 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 148 | |
d0f714f4 | 149 | batadv_vis_quit(bat_priv); |
c6c8fea2 | 150 | |
7cf06bc6 | 151 | batadv_gw_node_purge(bat_priv); |
7d211efc | 152 | batadv_originator_free(bat_priv); |
c6c8fea2 | 153 | |
08c36d3e | 154 | batadv_tt_free(bat_priv); |
c6c8fea2 | 155 | |
08adf151 | 156 | batadv_bla_free(bat_priv); |
23721387 | 157 | |
f8214865 MH |
158 | free_percpu(bat_priv->bat_counters); |
159 | ||
39c75a51 | 160 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
161 | } |
162 | ||
3193e8fd | 163 | void batadv_inc_module_count(void) |
c6c8fea2 SE |
164 | { |
165 | try_module_get(THIS_MODULE); | |
166 | } | |
167 | ||
3193e8fd | 168 | void batadv_dec_module_count(void) |
c6c8fea2 SE |
169 | { |
170 | module_put(THIS_MODULE); | |
171 | } | |
172 | ||
3193e8fd | 173 | int batadv_is_my_mac(const uint8_t *addr) |
c6c8fea2 | 174 | { |
56303d34 | 175 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
176 | |
177 | rcu_read_lock(); | |
3193e8fd | 178 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 179 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
180 | continue; |
181 | ||
1eda58bf | 182 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
183 | rcu_read_unlock(); |
184 | return 1; | |
185 | } | |
186 | } | |
187 | rcu_read_unlock(); | |
188 | return 0; | |
c6c8fea2 SE |
189 | } |
190 | ||
ee11ad61 | 191 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 192 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
193 | { |
194 | return NET_RX_DROP; | |
195 | } | |
196 | ||
197 | /* incoming packets with the batman ethertype received on any active hard | |
198 | * interface | |
199 | */ | |
3193e8fd SE |
200 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
201 | struct packet_type *ptype, | |
202 | struct net_device *orig_dev) | |
ffa995e0 | 203 | { |
56303d34 | 204 | struct batadv_priv *bat_priv; |
96412690 | 205 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 206 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
207 | uint8_t idx; |
208 | int ret; | |
209 | ||
56303d34 SE |
210 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
211 | batman_adv_ptype); | |
ffa995e0 ML |
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 | ||
39c75a51 | 231 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
232 | goto err_free; |
233 | ||
234 | /* discard frames on not active interfaces */ | |
e9a4f295 | 235 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
236 | goto err_free; |
237 | ||
96412690 | 238 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 239 | |
96412690 | 240 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 241 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 242 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 243 | batadv_ogm_packet->header.version); |
ffa995e0 ML |
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 | */ | |
96412690 | 250 | idx = batadv_ogm_packet->header.packet_type; |
ee11ad61 | 251 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
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 | ||
ee11ad61 | 268 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
269 | { |
270 | int i; | |
271 | ||
ee11ad61 SE |
272 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
273 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 274 | |
ffa995e0 | 275 | /* batman icmp packet */ |
acd34afa | 276 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; |
ffa995e0 | 277 | /* unicast packet */ |
acd34afa | 278 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ffa995e0 | 279 | /* fragmented unicast packet */ |
acd34afa | 280 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet; |
ffa995e0 | 281 | /* broadcast packet */ |
acd34afa | 282 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; |
ffa995e0 | 283 | /* vis packet */ |
acd34afa | 284 | batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet; |
ffa995e0 | 285 | /* Translation table query (request or response) */ |
acd34afa | 286 | batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query; |
ffa995e0 | 287 | /* Roaming advertisement */ |
acd34afa | 288 | batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv; |
ffa995e0 ML |
289 | } |
290 | ||
56303d34 SE |
291 | int |
292 | batadv_recv_handler_register(uint8_t packet_type, | |
293 | int (*recv_handler)(struct sk_buff *, | |
294 | struct batadv_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 | ||
56303d34 | 308 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 309 | { |
56303d34 | 310 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 ML |
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 | ||
56303d34 | 324 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 325 | { |
56303d34 | 326 | struct batadv_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 | ||
56303d34 | 358 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 359 | { |
56303d34 | 360 | struct batadv_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 | 375 | { |
56303d34 | 376 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 ML |
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 | 389 | { |
56303d34 | 390 | struct batadv_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 | ||
42d0b044 SE |
423 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
424 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
425 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
426 | MODULE_VERSION(BATADV_SOURCE_VERSION); |