Commit | Line | Data |
---|---|---|
c6c8fea2 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "bat_sysfs.h" | |
24 | #include "bat_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" | |
23721387 | 33 | #include "bridge_loop_avoidance.h" |
c6c8fea2 SE |
34 | #include "vis.h" |
35 | #include "hash.h" | |
1c280471 | 36 | #include "bat_algo.h" |
c6c8fea2 | 37 | |
c3caf519 SE |
38 | |
39 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, | |
40 | * list traversals just rcu-locked */ | |
4389e47a | 41 | struct list_head hardif_list; |
ffa995e0 | 42 | static int (*recv_packet_handler[256])(struct sk_buff *, struct hard_iface *); |
1c280471 ML |
43 | char bat_routing_algo[20] = "BATMAN IV"; |
44 | static struct hlist_head bat_algo_list; | |
c6c8fea2 SE |
45 | |
46 | unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; | |
47 | ||
48 | struct workqueue_struct *bat_event_workqueue; | |
49 | ||
ffa995e0 ML |
50 | static void recv_handler_init(void); |
51 | ||
c6c8fea2 SE |
52 | static int __init batman_init(void) |
53 | { | |
4389e47a | 54 | INIT_LIST_HEAD(&hardif_list); |
1c280471 ML |
55 | INIT_HLIST_HEAD(&bat_algo_list); |
56 | ||
ffa995e0 ML |
57 | recv_handler_init(); |
58 | ||
1c280471 | 59 | bat_iv_init(); |
c6c8fea2 SE |
60 | |
61 | /* the name should not be longer than 10 chars - see | |
62 | * http://lwn.net/Articles/23634/ */ | |
63 | bat_event_workqueue = create_singlethread_workqueue("bat_events"); | |
64 | ||
65 | if (!bat_event_workqueue) | |
66 | return -ENOMEM; | |
67 | ||
68 | bat_socket_init(); | |
69 | debugfs_init(); | |
70 | ||
71 | register_netdevice_notifier(&hard_if_notifier); | |
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 | { | |
81 | debugfs_destroy(); | |
82 | unregister_netdevice_notifier(&hard_if_notifier); | |
83 | hardif_remove_interfaces(); | |
84 | ||
85 | flush_workqueue(bat_event_workqueue); | |
86 | destroy_workqueue(bat_event_workqueue); | |
87 | bat_event_workqueue = NULL; | |
88 | ||
89 | rcu_barrier(); | |
90 | } | |
91 | ||
92 | int mesh_init(struct net_device *soft_iface) | |
93 | { | |
94 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
95 | ||
c6c8fea2 SE |
96 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
97 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
a73105b8 AQ |
98 | spin_lock_init(&bat_priv->tt_changes_list_lock); |
99 | spin_lock_init(&bat_priv->tt_req_list_lock); | |
cc47f66e | 100 | spin_lock_init(&bat_priv->tt_roam_list_lock); |
a73105b8 | 101 | spin_lock_init(&bat_priv->tt_buff_lock); |
c6c8fea2 SE |
102 | spin_lock_init(&bat_priv->gw_list_lock); |
103 | spin_lock_init(&bat_priv->vis_hash_lock); | |
104 | spin_lock_init(&bat_priv->vis_list_lock); | |
c6c8fea2 SE |
105 | |
106 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
107 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
108 | INIT_HLIST_HEAD(&bat_priv->gw_list); | |
a73105b8 AQ |
109 | INIT_LIST_HEAD(&bat_priv->tt_changes_list); |
110 | INIT_LIST_HEAD(&bat_priv->tt_req_list); | |
cc47f66e | 111 | INIT_LIST_HEAD(&bat_priv->tt_roam_list); |
c6c8fea2 SE |
112 | |
113 | if (originator_init(bat_priv) < 1) | |
114 | goto err; | |
115 | ||
a73105b8 | 116 | if (tt_init(bat_priv) < 1) |
c6c8fea2 SE |
117 | goto err; |
118 | ||
bc279080 | 119 | tt_local_add(soft_iface, soft_iface->dev_addr, NULL_IFINDEX); |
c6c8fea2 SE |
120 | |
121 | if (vis_init(bat_priv) < 1) | |
122 | goto err; | |
123 | ||
23721387 SW |
124 | if (bla_init(bat_priv) < 1) |
125 | goto err; | |
126 | ||
2265c141 | 127 | atomic_set(&bat_priv->gw_reselect, 0); |
c6c8fea2 SE |
128 | atomic_set(&bat_priv->mesh_state, MESH_ACTIVE); |
129 | goto end; | |
130 | ||
131 | err: | |
c6c8fea2 SE |
132 | mesh_free(soft_iface); |
133 | return -1; | |
134 | ||
135 | end: | |
136 | return 0; | |
137 | } | |
138 | ||
139 | void mesh_free(struct net_device *soft_iface) | |
140 | { | |
141 | struct bat_priv *bat_priv = netdev_priv(soft_iface); | |
142 | ||
143 | atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING); | |
144 | ||
145 | purge_outstanding_packets(bat_priv, NULL); | |
146 | ||
147 | vis_quit(bat_priv); | |
148 | ||
149 | gw_node_purge(bat_priv); | |
150 | originator_free(bat_priv); | |
151 | ||
a73105b8 | 152 | tt_free(bat_priv); |
c6c8fea2 | 153 | |
23721387 SW |
154 | bla_free(bat_priv); |
155 | ||
c6c8fea2 SE |
156 | atomic_set(&bat_priv->mesh_state, MESH_INACTIVE); |
157 | } | |
158 | ||
159 | void inc_module_count(void) | |
160 | { | |
161 | try_module_get(THIS_MODULE); | |
162 | } | |
163 | ||
164 | void dec_module_count(void) | |
165 | { | |
166 | module_put(THIS_MODULE); | |
167 | } | |
168 | ||
747e4221 | 169 | int is_my_mac(const uint8_t *addr) |
c6c8fea2 | 170 | { |
747e4221 | 171 | const struct hard_iface *hard_iface; |
c6c8fea2 SE |
172 | |
173 | rcu_read_lock(); | |
e6c10f43 ML |
174 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
175 | if (hard_iface->if_status != IF_ACTIVE) | |
c6c8fea2 SE |
176 | continue; |
177 | ||
e6c10f43 | 178 | if (compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
179 | rcu_read_unlock(); |
180 | return 1; | |
181 | } | |
182 | } | |
183 | rcu_read_unlock(); | |
184 | return 0; | |
c6c8fea2 SE |
185 | } |
186 | ||
ffa995e0 ML |
187 | static int recv_unhandled_packet(struct sk_buff *skb, |
188 | struct hard_iface *recv_if) | |
189 | { | |
190 | return NET_RX_DROP; | |
191 | } | |
192 | ||
193 | /* incoming packets with the batman ethertype received on any active hard | |
194 | * interface | |
195 | */ | |
196 | int batman_skb_recv(struct sk_buff *skb, struct net_device *dev, | |
197 | struct packet_type *ptype, struct net_device *orig_dev) | |
198 | { | |
199 | struct bat_priv *bat_priv; | |
200 | struct batman_ogm_packet *batman_ogm_packet; | |
201 | struct hard_iface *hard_iface; | |
202 | uint8_t idx; | |
203 | int ret; | |
204 | ||
205 | hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype); | |
206 | skb = skb_share_check(skb, GFP_ATOMIC); | |
207 | ||
208 | /* skb was released by skb_share_check() */ | |
209 | if (!skb) | |
210 | goto err_out; | |
211 | ||
212 | /* packet should hold at least type and version */ | |
213 | if (unlikely(!pskb_may_pull(skb, 2))) | |
214 | goto err_free; | |
215 | ||
216 | /* expect a valid ethernet header here. */ | |
217 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
218 | goto err_free; | |
219 | ||
220 | if (!hard_iface->soft_iface) | |
221 | goto err_free; | |
222 | ||
223 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
224 | ||
225 | if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) | |
226 | goto err_free; | |
227 | ||
228 | /* discard frames on not active interfaces */ | |
229 | if (hard_iface->if_status != IF_ACTIVE) | |
230 | goto err_free; | |
231 | ||
232 | batman_ogm_packet = (struct batman_ogm_packet *)skb->data; | |
233 | ||
234 | if (batman_ogm_packet->header.version != COMPAT_VERSION) { | |
235 | bat_dbg(DBG_BATMAN, bat_priv, | |
236 | "Drop packet: incompatible batman version (%i)\n", | |
237 | batman_ogm_packet->header.version); | |
238 | goto err_free; | |
239 | } | |
240 | ||
241 | /* all receive handlers return whether they received or reused | |
242 | * the supplied skb. if not, we have to free the skb. | |
243 | */ | |
244 | idx = batman_ogm_packet->header.packet_type; | |
245 | ret = (*recv_packet_handler[idx])(skb, hard_iface); | |
246 | ||
247 | if (ret == NET_RX_DROP) | |
248 | kfree_skb(skb); | |
249 | ||
250 | /* return NET_RX_SUCCESS in any case as we | |
251 | * most probably dropped the packet for | |
252 | * routing-logical reasons. | |
253 | */ | |
254 | return NET_RX_SUCCESS; | |
255 | ||
256 | err_free: | |
257 | kfree_skb(skb); | |
258 | err_out: | |
259 | return NET_RX_DROP; | |
260 | } | |
261 | ||
262 | static void recv_handler_init(void) | |
263 | { | |
264 | int i; | |
265 | ||
266 | for (i = 0; i < ARRAY_SIZE(recv_packet_handler); i++) | |
267 | recv_packet_handler[i] = recv_unhandled_packet; | |
268 | ||
ffa995e0 ML |
269 | /* batman icmp packet */ |
270 | recv_packet_handler[BAT_ICMP] = recv_icmp_packet; | |
271 | /* unicast packet */ | |
272 | recv_packet_handler[BAT_UNICAST] = recv_unicast_packet; | |
273 | /* fragmented unicast packet */ | |
274 | recv_packet_handler[BAT_UNICAST_FRAG] = recv_ucast_frag_packet; | |
275 | /* broadcast packet */ | |
276 | recv_packet_handler[BAT_BCAST] = recv_bcast_packet; | |
277 | /* vis packet */ | |
278 | recv_packet_handler[BAT_VIS] = recv_vis_packet; | |
279 | /* Translation table query (request or response) */ | |
280 | recv_packet_handler[BAT_TT_QUERY] = recv_tt_query; | |
281 | /* Roaming advertisement */ | |
282 | recv_packet_handler[BAT_ROAM_ADV] = recv_roam_adv; | |
283 | } | |
284 | ||
285 | int recv_handler_register(uint8_t packet_type, | |
286 | int (*recv_handler)(struct sk_buff *, | |
287 | struct hard_iface *)) | |
288 | { | |
289 | if (recv_packet_handler[packet_type] != &recv_unhandled_packet) | |
290 | return -EBUSY; | |
291 | ||
292 | recv_packet_handler[packet_type] = recv_handler; | |
293 | return 0; | |
294 | } | |
295 | ||
296 | void recv_handler_unregister(uint8_t packet_type) | |
297 | { | |
298 | recv_packet_handler[packet_type] = recv_unhandled_packet; | |
299 | } | |
300 | ||
1c280471 ML |
301 | static struct bat_algo_ops *bat_algo_get(char *name) |
302 | { | |
303 | struct bat_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; | |
304 | struct hlist_node *node; | |
305 | ||
306 | hlist_for_each_entry(bat_algo_ops_tmp, node, &bat_algo_list, list) { | |
307 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) | |
308 | continue; | |
309 | ||
310 | bat_algo_ops = bat_algo_ops_tmp; | |
311 | break; | |
312 | } | |
313 | ||
314 | return bat_algo_ops; | |
315 | } | |
316 | ||
317 | int bat_algo_register(struct bat_algo_ops *bat_algo_ops) | |
318 | { | |
319 | struct bat_algo_ops *bat_algo_ops_tmp; | |
320 | int ret = -1; | |
321 | ||
322 | bat_algo_ops_tmp = bat_algo_get(bat_algo_ops->name); | |
323 | if (bat_algo_ops_tmp) { | |
86ceb360 SE |
324 | pr_info("Trying to register already registered routing algorithm: %s\n", |
325 | bat_algo_ops->name); | |
1c280471 ML |
326 | goto out; |
327 | } | |
328 | ||
01c4224b | 329 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 330 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 331 | !bat_algo_ops->bat_iface_disable || |
cd8b78e7 | 332 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b ML |
333 | !bat_algo_ops->bat_ogm_update_mac || |
334 | !bat_algo_ops->bat_ogm_schedule || | |
c3e29312 | 335 | !bat_algo_ops->bat_ogm_emit) { |
01c4224b ML |
336 | pr_info("Routing algo '%s' does not implement required ops\n", |
337 | bat_algo_ops->name); | |
338 | goto out; | |
339 | } | |
340 | ||
1c280471 ML |
341 | INIT_HLIST_NODE(&bat_algo_ops->list); |
342 | hlist_add_head(&bat_algo_ops->list, &bat_algo_list); | |
343 | ret = 0; | |
344 | ||
345 | out: | |
346 | return ret; | |
347 | } | |
348 | ||
349 | int bat_algo_select(struct bat_priv *bat_priv, char *name) | |
350 | { | |
351 | struct bat_algo_ops *bat_algo_ops; | |
352 | int ret = -1; | |
353 | ||
354 | bat_algo_ops = bat_algo_get(name); | |
355 | if (!bat_algo_ops) | |
356 | goto out; | |
357 | ||
358 | bat_priv->bat_algo_ops = bat_algo_ops; | |
359 | ret = 0; | |
360 | ||
361 | out: | |
362 | return ret; | |
363 | } | |
364 | ||
365 | int bat_algo_seq_print_text(struct seq_file *seq, void *offset) | |
366 | { | |
367 | struct bat_algo_ops *bat_algo_ops; | |
368 | struct hlist_node *node; | |
369 | ||
370 | seq_printf(seq, "Available routing algorithms:\n"); | |
371 | ||
372 | hlist_for_each_entry(bat_algo_ops, node, &bat_algo_list, list) { | |
373 | seq_printf(seq, "%s\n", bat_algo_ops->name); | |
374 | } | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
d419be1f ML |
379 | static int param_set_ra(const char *val, const struct kernel_param *kp) |
380 | { | |
381 | struct bat_algo_ops *bat_algo_ops; | |
382 | ||
383 | bat_algo_ops = bat_algo_get((char *)val); | |
384 | if (!bat_algo_ops) { | |
385 | pr_err("Routing algorithm '%s' is not supported\n", val); | |
386 | return -EINVAL; | |
387 | } | |
388 | ||
389 | return param_set_copystring(val, kp); | |
390 | } | |
391 | ||
392 | static const struct kernel_param_ops param_ops_ra = { | |
393 | .set = param_set_ra, | |
394 | .get = param_get_string, | |
395 | }; | |
396 | ||
397 | static struct kparam_string __param_string_ra = { | |
398 | .maxlen = sizeof(bat_routing_algo), | |
399 | .string = bat_routing_algo, | |
400 | }; | |
401 | ||
402 | module_param_cb(routing_algo, ¶m_ops_ra, &__param_string_ra, 0644); | |
c6c8fea2 SE |
403 | module_init(batman_init); |
404 | module_exit(batman_exit); | |
405 | ||
406 | MODULE_LICENSE("GPL"); | |
407 | ||
408 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
409 | MODULE_DESCRIPTION(DRIVER_DESC); | |
410 | MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE); | |
c6c8fea2 | 411 | MODULE_VERSION(SOURCE_VERSION); |