Commit | Line | Data |
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0b873931 | 1 | /* Copyright (C) 2007-2013 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 | ||
95a066d8 SE |
20 | #include <linux/crc32c.h> |
21 | #include <linux/highmem.h> | |
c6c8fea2 | 22 | #include "main.h" |
b706b13b SE |
23 | #include "sysfs.h" |
24 | #include "debugfs.h" | |
c6c8fea2 SE |
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" |
2f1dfbe1 | 34 | #include "distributed-arp-table.h" |
c6c8fea2 SE |
35 | #include "vis.h" |
36 | #include "hash.h" | |
1c280471 | 37 | #include "bat_algo.h" |
d353d8d4 | 38 | #include "network-coding.h" |
c6c8fea2 | 39 | |
c3caf519 SE |
40 | |
41 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, | |
9cfc7bd6 SE |
42 | * list traversals just rcu-locked |
43 | */ | |
3193e8fd | 44 | struct list_head batadv_hardif_list; |
ee11ad61 | 45 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
56303d34 | 46 | struct batadv_hard_iface *); |
3193e8fd | 47 | char batadv_routing_algo[20] = "BATMAN_IV"; |
ee11ad61 | 48 | static struct hlist_head batadv_algo_list; |
c6c8fea2 | 49 | |
3193e8fd | 50 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 51 | |
3193e8fd | 52 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 53 | |
ee11ad61 | 54 | static void batadv_recv_handler_init(void); |
ffa995e0 | 55 | |
ee11ad61 | 56 | static int __init batadv_init(void) |
c6c8fea2 | 57 | { |
3193e8fd | 58 | INIT_LIST_HEAD(&batadv_hardif_list); |
ee11ad61 | 59 | INIT_HLIST_HEAD(&batadv_algo_list); |
1c280471 | 60 | |
ee11ad61 | 61 | batadv_recv_handler_init(); |
ffa995e0 | 62 | |
81c524f7 | 63 | batadv_iv_init(); |
c6c8fea2 | 64 | |
3193e8fd | 65 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 66 | |
3193e8fd | 67 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
68 | return -ENOMEM; |
69 | ||
9039dc7e | 70 | batadv_socket_init(); |
40a072d7 | 71 | batadv_debugfs_init(); |
c6c8fea2 | 72 | |
9563877e | 73 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 74 | rtnl_link_register(&batadv_link_ops); |
c6c8fea2 | 75 | |
86ceb360 | 76 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 77 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
78 | |
79 | return 0; | |
80 | } | |
81 | ||
ee11ad61 | 82 | static void __exit batadv_exit(void) |
c6c8fea2 | 83 | { |
40a072d7 | 84 | batadv_debugfs_destroy(); |
a4ac28c0 | 85 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
86 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
87 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 88 | |
3193e8fd SE |
89 | flush_workqueue(batadv_event_workqueue); |
90 | destroy_workqueue(batadv_event_workqueue); | |
91 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
92 | |
93 | rcu_barrier(); | |
94 | } | |
95 | ||
3193e8fd | 96 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 97 | { |
56303d34 | 98 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 99 | int ret; |
c6c8fea2 | 100 | |
c6c8fea2 SE |
101 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
102 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
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); | |
c6c8fea2 SE |
110 | |
111 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
112 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 SE |
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); | |
c6c8fea2 | 117 | |
7d211efc | 118 | ret = batadv_originator_init(bat_priv); |
5346c35e | 119 | if (ret < 0) |
c6c8fea2 SE |
120 | goto err; |
121 | ||
08c36d3e | 122 | ret = batadv_tt_init(bat_priv); |
5346c35e | 123 | if (ret < 0) |
c6c8fea2 SE |
124 | goto err; |
125 | ||
42d0b044 SE |
126 | batadv_tt_local_add(soft_iface, soft_iface->dev_addr, |
127 | BATADV_NULL_IFINDEX); | |
c6c8fea2 | 128 | |
d0f714f4 | 129 | ret = batadv_vis_init(bat_priv); |
5346c35e | 130 | if (ret < 0) |
c6c8fea2 SE |
131 | goto err; |
132 | ||
08adf151 | 133 | ret = batadv_bla_init(bat_priv); |
5346c35e | 134 | if (ret < 0) |
23721387 SW |
135 | goto err; |
136 | ||
2f1dfbe1 AQ |
137 | ret = batadv_dat_init(bat_priv); |
138 | if (ret < 0) | |
139 | goto err; | |
140 | ||
d353d8d4 MH |
141 | ret = batadv_nc_init(bat_priv); |
142 | if (ret < 0) | |
143 | goto err; | |
144 | ||
807736f6 | 145 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 146 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
147 | |
148 | return 0; | |
c6c8fea2 SE |
149 | |
150 | err: | |
3193e8fd | 151 | batadv_mesh_free(soft_iface); |
5346c35e | 152 | return ret; |
c6c8fea2 SE |
153 | } |
154 | ||
3193e8fd | 155 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 156 | { |
56303d34 | 157 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 158 | |
39c75a51 | 159 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 160 | |
9455e34c | 161 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 162 | |
d0f714f4 | 163 | batadv_vis_quit(bat_priv); |
c6c8fea2 | 164 | |
7cf06bc6 | 165 | batadv_gw_node_purge(bat_priv); |
d353d8d4 | 166 | batadv_nc_free(bat_priv); |
a4361860 AQ |
167 | batadv_dat_free(bat_priv); |
168 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 169 | |
a4361860 AQ |
170 | /* Free the TT and the originator tables only after having terminated |
171 | * all the other depending components which may use these structures for | |
172 | * their purposes. | |
173 | */ | |
08c36d3e | 174 | batadv_tt_free(bat_priv); |
c6c8fea2 | 175 | |
a4361860 AQ |
176 | /* Since the originator table clean up routine is accessing the TT |
177 | * tables as well, it has to be invoked after the TT tables have been | |
178 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
179 | * accessing the TT data are scheduled for later execution. | |
180 | */ | |
181 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 182 | |
f8214865 | 183 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 184 | bat_priv->bat_counters = NULL; |
f8214865 | 185 | |
39c75a51 | 186 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
187 | } |
188 | ||
6e0895c2 DM |
189 | /** |
190 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
191 | * interfaces in the current mesh | |
192 | * @bat_priv: the bat priv with all the soft interface information | |
193 | * @addr: the address to check | |
194 | */ | |
fe8a93b9 | 195 | int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr) |
c6c8fea2 | 196 | { |
56303d34 | 197 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
198 | |
199 | rcu_read_lock(); | |
3193e8fd | 200 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 201 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
202 | continue; |
203 | ||
fe8a93b9 AQ |
204 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
205 | continue; | |
206 | ||
1eda58bf | 207 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
208 | rcu_read_unlock(); |
209 | return 1; | |
210 | } | |
211 | } | |
212 | rcu_read_unlock(); | |
213 | return 0; | |
c6c8fea2 SE |
214 | } |
215 | ||
30da63a6 ML |
216 | /** |
217 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
218 | * function that requires the primary interface | |
219 | * @seq: debugfs table seq_file struct | |
220 | * | |
221 | * Returns primary interface if found or NULL otherwise. | |
222 | */ | |
223 | struct batadv_hard_iface * | |
224 | batadv_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 | ||
248 | out: | |
249 | return primary_if; | |
250 | } | |
251 | ||
ee11ad61 | 252 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 253 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
254 | { |
255 | return NET_RX_DROP; | |
256 | } | |
257 | ||
258 | /* incoming packets with the batman ethertype received on any active hard | |
259 | * interface | |
260 | */ | |
3193e8fd SE |
261 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
262 | struct packet_type *ptype, | |
263 | struct net_device *orig_dev) | |
ffa995e0 | 264 | { |
56303d34 | 265 | struct batadv_priv *bat_priv; |
96412690 | 266 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 267 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
268 | uint8_t idx; |
269 | int ret; | |
270 | ||
56303d34 SE |
271 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
272 | batman_adv_ptype); | |
ffa995e0 ML |
273 | skb = skb_share_check(skb, GFP_ATOMIC); |
274 | ||
275 | /* skb was released by skb_share_check() */ | |
276 | if (!skb) | |
277 | goto err_out; | |
278 | ||
279 | /* packet should hold at least type and version */ | |
280 | if (unlikely(!pskb_may_pull(skb, 2))) | |
281 | goto err_free; | |
282 | ||
283 | /* expect a valid ethernet header here. */ | |
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 | ||
39c75a51 | 292 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
293 | goto err_free; |
294 | ||
295 | /* discard frames on not active interfaces */ | |
e9a4f295 | 296 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
297 | goto err_free; |
298 | ||
96412690 | 299 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 300 | |
96412690 | 301 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 302 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 303 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 304 | batadv_ogm_packet->header.version); |
ffa995e0 ML |
305 | goto err_free; |
306 | } | |
307 | ||
308 | /* all receive handlers return whether they received or reused | |
309 | * the supplied skb. if not, we have to free the skb. | |
310 | */ | |
96412690 | 311 | idx = batadv_ogm_packet->header.packet_type; |
ee11ad61 | 312 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
313 | |
314 | if (ret == NET_RX_DROP) | |
315 | kfree_skb(skb); | |
316 | ||
317 | /* return NET_RX_SUCCESS in any case as we | |
318 | * most probably dropped the packet for | |
319 | * routing-logical reasons. | |
320 | */ | |
321 | return NET_RX_SUCCESS; | |
322 | ||
323 | err_free: | |
324 | kfree_skb(skb); | |
325 | err_out: | |
326 | return NET_RX_DROP; | |
327 | } | |
328 | ||
ee11ad61 | 329 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
330 | { |
331 | int i; | |
332 | ||
ee11ad61 SE |
333 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
334 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 335 | |
ffa995e0 | 336 | /* batman icmp packet */ |
acd34afa | 337 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; |
7cdcf6dd AQ |
338 | /* unicast with 4 addresses packet */ |
339 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 340 | /* unicast packet */ |
acd34afa | 341 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ffa995e0 | 342 | /* fragmented unicast packet */ |
acd34afa | 343 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet; |
ffa995e0 | 344 | /* broadcast packet */ |
acd34afa | 345 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; |
ffa995e0 | 346 | /* vis packet */ |
acd34afa | 347 | batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet; |
ffa995e0 | 348 | /* Translation table query (request or response) */ |
acd34afa | 349 | batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query; |
ffa995e0 | 350 | /* Roaming advertisement */ |
acd34afa | 351 | batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv; |
ffa995e0 ML |
352 | } |
353 | ||
56303d34 SE |
354 | int |
355 | batadv_recv_handler_register(uint8_t packet_type, | |
356 | int (*recv_handler)(struct sk_buff *, | |
357 | struct batadv_hard_iface *)) | |
ffa995e0 | 358 | { |
ee11ad61 | 359 | if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet) |
ffa995e0 ML |
360 | return -EBUSY; |
361 | ||
ee11ad61 | 362 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
363 | return 0; |
364 | } | |
365 | ||
3193e8fd | 366 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 367 | { |
ee11ad61 | 368 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
369 | } |
370 | ||
56303d34 | 371 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 372 | { |
56303d34 | 373 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 374 | |
b67bfe0d | 375 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
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 | ||
56303d34 | 386 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 387 | { |
56303d34 | 388 | struct batadv_algo_ops *bat_algo_ops_tmp; |
5346c35e | 389 | int ret; |
1c280471 | 390 | |
ee11ad61 | 391 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 392 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
393 | pr_info("Trying to register already registered routing algorithm: %s\n", |
394 | bat_algo_ops->name); | |
5346c35e | 395 | ret = -EEXIST; |
1c280471 ML |
396 | goto out; |
397 | } | |
398 | ||
01c4224b | 399 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 400 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 401 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 402 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 403 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 404 | !bat_algo_ops->bat_ogm_schedule || |
c3e29312 | 405 | !bat_algo_ops->bat_ogm_emit) { |
01c4224b ML |
406 | pr_info("Routing algo '%s' does not implement required ops\n", |
407 | bat_algo_ops->name); | |
5346c35e | 408 | ret = -EINVAL; |
01c4224b ML |
409 | goto out; |
410 | } | |
411 | ||
1c280471 | 412 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 413 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 ML |
414 | ret = 0; |
415 | ||
416 | out: | |
417 | return ret; | |
418 | } | |
419 | ||
56303d34 | 420 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 421 | { |
56303d34 | 422 | struct batadv_algo_ops *bat_algo_ops; |
5346c35e | 423 | int ret = -EINVAL; |
1c280471 | 424 | |
ee11ad61 | 425 | bat_algo_ops = batadv_algo_get(name); |
1c280471 ML |
426 | if (!bat_algo_ops) |
427 | goto out; | |
428 | ||
429 | bat_priv->bat_algo_ops = bat_algo_ops; | |
430 | ret = 0; | |
431 | ||
432 | out: | |
433 | return ret; | |
434 | } | |
435 | ||
3193e8fd | 436 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 437 | { |
56303d34 | 438 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 439 | |
0c814653 | 440 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 441 | |
b67bfe0d | 442 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
1c280471 ML |
443 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
444 | } | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
95a066d8 SE |
449 | /** |
450 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
451 | * the header | |
452 | * @skb: skb pointing to fragmented socket buffers | |
453 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
454 | * marking the start of the data to be CRC'ed | |
455 | * | |
456 | * payload_ptr must always point to an address in the skb head buffer and not to | |
457 | * a fragment. | |
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 | skb_abort_seq_read(&st); | |
477 | ||
478 | return htonl(crc); | |
479 | } | |
480 | ||
ee11ad61 | 481 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 482 | { |
56303d34 | 483 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
484 | char *algo_name = (char *)val; |
485 | size_t name_len = strlen(algo_name); | |
d419be1f | 486 | |
293c9c1c | 487 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
488 | algo_name[name_len - 1] = '\0'; |
489 | ||
ee11ad61 | 490 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 491 | if (!bat_algo_ops) { |
d8cb5486 | 492 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
493 | return -EINVAL; |
494 | } | |
495 | ||
d8cb5486 | 496 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
497 | } |
498 | ||
ee11ad61 SE |
499 | static const struct kernel_param_ops batadv_param_ops_ra = { |
500 | .set = batadv_param_set_ra, | |
d419be1f ML |
501 | .get = param_get_string, |
502 | }; | |
503 | ||
ee11ad61 | 504 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
505 | .maxlen = sizeof(batadv_routing_algo), |
506 | .string = batadv_routing_algo, | |
d419be1f ML |
507 | }; |
508 | ||
ee11ad61 SE |
509 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
510 | 0644); | |
511 | module_init(batadv_init); | |
512 | module_exit(batadv_exit); | |
c6c8fea2 SE |
513 | |
514 | MODULE_LICENSE("GPL"); | |
515 | ||
42d0b044 SE |
516 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
517 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
518 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
519 | MODULE_VERSION(BATADV_SOURCE_VERSION); |