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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> | |
c54f38c9 SW |
22 | #include <linux/if_vlan.h> |
23 | #include <net/ip.h> | |
24 | #include <net/ipv6.h> | |
25 | #include <net/dsfield.h> | |
c6c8fea2 | 26 | #include "main.h" |
b706b13b SE |
27 | #include "sysfs.h" |
28 | #include "debugfs.h" | |
c6c8fea2 SE |
29 | #include "routing.h" |
30 | #include "send.h" | |
31 | #include "originator.h" | |
32 | #include "soft-interface.h" | |
33 | #include "icmp_socket.h" | |
34 | #include "translation-table.h" | |
35 | #include "hard-interface.h" | |
36 | #include "gateway_client.h" | |
23721387 | 37 | #include "bridge_loop_avoidance.h" |
2f1dfbe1 | 38 | #include "distributed-arp-table.h" |
c6c8fea2 SE |
39 | #include "vis.h" |
40 | #include "hash.h" | |
1c280471 | 41 | #include "bat_algo.h" |
d353d8d4 | 42 | #include "network-coding.h" |
c6c8fea2 | 43 | |
c3caf519 SE |
44 | |
45 | /* List manipulations on hardif_list have to be rtnl_lock()'ed, | |
9cfc7bd6 SE |
46 | * list traversals just rcu-locked |
47 | */ | |
3193e8fd | 48 | struct list_head batadv_hardif_list; |
ee11ad61 | 49 | static int (*batadv_rx_handler[256])(struct sk_buff *, |
56303d34 | 50 | struct batadv_hard_iface *); |
3193e8fd | 51 | char batadv_routing_algo[20] = "BATMAN_IV"; |
ee11ad61 | 52 | static struct hlist_head batadv_algo_list; |
c6c8fea2 | 53 | |
3193e8fd | 54 | unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
c6c8fea2 | 55 | |
3193e8fd | 56 | struct workqueue_struct *batadv_event_workqueue; |
c6c8fea2 | 57 | |
ee11ad61 | 58 | static void batadv_recv_handler_init(void); |
ffa995e0 | 59 | |
ee11ad61 | 60 | static int __init batadv_init(void) |
c6c8fea2 | 61 | { |
3193e8fd | 62 | INIT_LIST_HEAD(&batadv_hardif_list); |
ee11ad61 | 63 | INIT_HLIST_HEAD(&batadv_algo_list); |
1c280471 | 64 | |
ee11ad61 | 65 | batadv_recv_handler_init(); |
ffa995e0 | 66 | |
81c524f7 | 67 | batadv_iv_init(); |
c6c8fea2 | 68 | |
3193e8fd | 69 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 70 | |
3193e8fd | 71 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
72 | return -ENOMEM; |
73 | ||
9039dc7e | 74 | batadv_socket_init(); |
40a072d7 | 75 | batadv_debugfs_init(); |
c6c8fea2 | 76 | |
9563877e | 77 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 78 | rtnl_link_register(&batadv_link_ops); |
c6c8fea2 | 79 | |
86ceb360 | 80 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 81 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
82 | |
83 | return 0; | |
84 | } | |
85 | ||
ee11ad61 | 86 | static void __exit batadv_exit(void) |
c6c8fea2 | 87 | { |
40a072d7 | 88 | batadv_debugfs_destroy(); |
a4ac28c0 | 89 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
90 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
91 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 92 | |
3193e8fd SE |
93 | flush_workqueue(batadv_event_workqueue); |
94 | destroy_workqueue(batadv_event_workqueue); | |
95 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
96 | |
97 | rcu_barrier(); | |
98 | } | |
99 | ||
3193e8fd | 100 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 101 | { |
56303d34 | 102 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 103 | int ret; |
c6c8fea2 | 104 | |
c6c8fea2 SE |
105 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
106 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
107 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
108 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
109 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
110 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
111 | spin_lock_init(&bat_priv->gw.list_lock); | |
112 | spin_lock_init(&bat_priv->vis.hash_lock); | |
113 | spin_lock_init(&bat_priv->vis.list_lock); | |
c6c8fea2 SE |
114 | |
115 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
116 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 SE |
117 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
118 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); | |
119 | INIT_LIST_HEAD(&bat_priv->tt.req_list); | |
120 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); | |
c6c8fea2 | 121 | |
7d211efc | 122 | ret = batadv_originator_init(bat_priv); |
5346c35e | 123 | if (ret < 0) |
c6c8fea2 SE |
124 | goto err; |
125 | ||
08c36d3e | 126 | ret = batadv_tt_init(bat_priv); |
5346c35e | 127 | if (ret < 0) |
c6c8fea2 SE |
128 | goto err; |
129 | ||
42d0b044 SE |
130 | batadv_tt_local_add(soft_iface, soft_iface->dev_addr, |
131 | BATADV_NULL_IFINDEX); | |
c6c8fea2 | 132 | |
d0f714f4 | 133 | ret = batadv_vis_init(bat_priv); |
5346c35e | 134 | if (ret < 0) |
c6c8fea2 SE |
135 | goto err; |
136 | ||
08adf151 | 137 | ret = batadv_bla_init(bat_priv); |
5346c35e | 138 | if (ret < 0) |
23721387 SW |
139 | goto err; |
140 | ||
2f1dfbe1 AQ |
141 | ret = batadv_dat_init(bat_priv); |
142 | if (ret < 0) | |
143 | goto err; | |
144 | ||
d353d8d4 MH |
145 | ret = batadv_nc_init(bat_priv); |
146 | if (ret < 0) | |
147 | goto err; | |
148 | ||
807736f6 | 149 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 150 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
151 | |
152 | return 0; | |
c6c8fea2 SE |
153 | |
154 | err: | |
3193e8fd | 155 | batadv_mesh_free(soft_iface); |
5346c35e | 156 | return ret; |
c6c8fea2 SE |
157 | } |
158 | ||
3193e8fd | 159 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 160 | { |
56303d34 | 161 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 162 | |
39c75a51 | 163 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 164 | |
9455e34c | 165 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 166 | |
d0f714f4 | 167 | batadv_vis_quit(bat_priv); |
c6c8fea2 | 168 | |
7cf06bc6 | 169 | batadv_gw_node_purge(bat_priv); |
d353d8d4 | 170 | batadv_nc_free(bat_priv); |
a4361860 AQ |
171 | batadv_dat_free(bat_priv); |
172 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 173 | |
a4361860 AQ |
174 | /* Free the TT and the originator tables only after having terminated |
175 | * all the other depending components which may use these structures for | |
176 | * their purposes. | |
177 | */ | |
08c36d3e | 178 | batadv_tt_free(bat_priv); |
c6c8fea2 | 179 | |
a4361860 AQ |
180 | /* Since the originator table clean up routine is accessing the TT |
181 | * tables as well, it has to be invoked after the TT tables have been | |
182 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
183 | * accessing the TT data are scheduled for later execution. | |
184 | */ | |
185 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 186 | |
f8214865 | 187 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 188 | bat_priv->bat_counters = NULL; |
f8214865 | 189 | |
39c75a51 | 190 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
191 | } |
192 | ||
6e0895c2 DM |
193 | /** |
194 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
195 | * interfaces in the current mesh | |
196 | * @bat_priv: the bat priv with all the soft interface information | |
197 | * @addr: the address to check | |
198 | */ | |
fe8a93b9 | 199 | int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr) |
c6c8fea2 | 200 | { |
56303d34 | 201 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
202 | |
203 | rcu_read_lock(); | |
3193e8fd | 204 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 205 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
206 | continue; |
207 | ||
fe8a93b9 AQ |
208 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
209 | continue; | |
210 | ||
1eda58bf | 211 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
212 | rcu_read_unlock(); |
213 | return 1; | |
214 | } | |
215 | } | |
216 | rcu_read_unlock(); | |
217 | return 0; | |
c6c8fea2 SE |
218 | } |
219 | ||
30da63a6 ML |
220 | /** |
221 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
222 | * function that requires the primary interface | |
223 | * @seq: debugfs table seq_file struct | |
224 | * | |
225 | * Returns primary interface if found or NULL otherwise. | |
226 | */ | |
227 | struct batadv_hard_iface * | |
228 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
229 | { | |
230 | struct net_device *net_dev = (struct net_device *)seq->private; | |
231 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
232 | struct batadv_hard_iface *primary_if; | |
233 | ||
234 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
235 | ||
236 | if (!primary_if) { | |
237 | seq_printf(seq, | |
238 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
239 | net_dev->name); | |
240 | goto out; | |
241 | } | |
242 | ||
243 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
244 | goto out; | |
245 | ||
246 | seq_printf(seq, | |
247 | "BATMAN mesh %s disabled - primary interface not active\n", | |
248 | net_dev->name); | |
249 | batadv_hardif_free_ref(primary_if); | |
250 | primary_if = NULL; | |
251 | ||
252 | out: | |
253 | return primary_if; | |
254 | } | |
255 | ||
c54f38c9 SW |
256 | /** |
257 | * batadv_skb_set_priority - sets skb priority according to packet content | |
258 | * @skb: the packet to be sent | |
259 | * @offset: offset to the packet content | |
260 | * | |
261 | * This function sets a value between 256 and 263 (802.1d priority), which | |
262 | * can be interpreted by the cfg80211 or other drivers. | |
263 | */ | |
264 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
265 | { | |
266 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
267 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
268 | struct ethhdr ethhdr_tmp, *ethhdr; | |
269 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
270 | u32 prio; | |
271 | ||
272 | /* already set, do nothing */ | |
273 | if (skb->priority >= 256 && skb->priority <= 263) | |
274 | return; | |
275 | ||
276 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
277 | if (!ethhdr) | |
278 | return; | |
279 | ||
280 | switch (ethhdr->h_proto) { | |
281 | case htons(ETH_P_8021Q): | |
282 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
283 | sizeof(*vhdr), &vhdr_tmp); | |
284 | if (!vhdr) | |
285 | return; | |
286 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
287 | prio = prio >> VLAN_PRIO_SHIFT; | |
288 | break; | |
289 | case htons(ETH_P_IP): | |
290 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
291 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
292 | if (!ip_hdr) | |
293 | return; | |
294 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
295 | break; | |
296 | case htons(ETH_P_IPV6): | |
297 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
298 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
299 | if (!ip6_hdr) | |
300 | return; | |
301 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
302 | break; | |
303 | default: | |
304 | return; | |
305 | } | |
306 | ||
307 | skb->priority = prio + 256; | |
308 | } | |
309 | ||
ee11ad61 | 310 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 311 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
312 | { |
313 | return NET_RX_DROP; | |
314 | } | |
315 | ||
316 | /* incoming packets with the batman ethertype received on any active hard | |
317 | * interface | |
318 | */ | |
3193e8fd SE |
319 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
320 | struct packet_type *ptype, | |
321 | struct net_device *orig_dev) | |
ffa995e0 | 322 | { |
56303d34 | 323 | struct batadv_priv *bat_priv; |
96412690 | 324 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 325 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
326 | uint8_t idx; |
327 | int ret; | |
328 | ||
56303d34 SE |
329 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
330 | batman_adv_ptype); | |
ffa995e0 ML |
331 | skb = skb_share_check(skb, GFP_ATOMIC); |
332 | ||
333 | /* skb was released by skb_share_check() */ | |
334 | if (!skb) | |
335 | goto err_out; | |
336 | ||
337 | /* packet should hold at least type and version */ | |
338 | if (unlikely(!pskb_may_pull(skb, 2))) | |
339 | goto err_free; | |
340 | ||
341 | /* expect a valid ethernet header here. */ | |
342 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
343 | goto err_free; | |
344 | ||
345 | if (!hard_iface->soft_iface) | |
346 | goto err_free; | |
347 | ||
348 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
349 | ||
39c75a51 | 350 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
351 | goto err_free; |
352 | ||
353 | /* discard frames on not active interfaces */ | |
e9a4f295 | 354 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
355 | goto err_free; |
356 | ||
96412690 | 357 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 358 | |
96412690 | 359 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 360 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 361 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 362 | batadv_ogm_packet->header.version); |
ffa995e0 ML |
363 | goto err_free; |
364 | } | |
365 | ||
366 | /* all receive handlers return whether they received or reused | |
367 | * the supplied skb. if not, we have to free the skb. | |
368 | */ | |
96412690 | 369 | idx = batadv_ogm_packet->header.packet_type; |
ee11ad61 | 370 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
371 | |
372 | if (ret == NET_RX_DROP) | |
373 | kfree_skb(skb); | |
374 | ||
375 | /* return NET_RX_SUCCESS in any case as we | |
376 | * most probably dropped the packet for | |
377 | * routing-logical reasons. | |
378 | */ | |
379 | return NET_RX_SUCCESS; | |
380 | ||
381 | err_free: | |
382 | kfree_skb(skb); | |
383 | err_out: | |
384 | return NET_RX_DROP; | |
385 | } | |
386 | ||
ee11ad61 | 387 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
388 | { |
389 | int i; | |
390 | ||
ee11ad61 SE |
391 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
392 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 393 | |
ffa995e0 | 394 | /* batman icmp packet */ |
acd34afa | 395 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; |
7cdcf6dd AQ |
396 | /* unicast with 4 addresses packet */ |
397 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 398 | /* unicast packet */ |
acd34afa | 399 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ffa995e0 | 400 | /* fragmented unicast packet */ |
acd34afa | 401 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet; |
ffa995e0 | 402 | /* broadcast packet */ |
acd34afa | 403 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; |
ffa995e0 | 404 | /* vis packet */ |
acd34afa | 405 | batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet; |
ffa995e0 | 406 | /* Translation table query (request or response) */ |
acd34afa | 407 | batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query; |
ffa995e0 | 408 | /* Roaming advertisement */ |
acd34afa | 409 | batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv; |
ffa995e0 ML |
410 | } |
411 | ||
56303d34 SE |
412 | int |
413 | batadv_recv_handler_register(uint8_t packet_type, | |
414 | int (*recv_handler)(struct sk_buff *, | |
415 | struct batadv_hard_iface *)) | |
ffa995e0 | 416 | { |
ee11ad61 | 417 | if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet) |
ffa995e0 ML |
418 | return -EBUSY; |
419 | ||
ee11ad61 | 420 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
421 | return 0; |
422 | } | |
423 | ||
3193e8fd | 424 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 425 | { |
ee11ad61 | 426 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
427 | } |
428 | ||
56303d34 | 429 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 430 | { |
56303d34 | 431 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 432 | |
b67bfe0d | 433 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
434 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
435 | continue; | |
436 | ||
437 | bat_algo_ops = bat_algo_ops_tmp; | |
438 | break; | |
439 | } | |
440 | ||
441 | return bat_algo_ops; | |
442 | } | |
443 | ||
56303d34 | 444 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 445 | { |
56303d34 | 446 | struct batadv_algo_ops *bat_algo_ops_tmp; |
5346c35e | 447 | int ret; |
1c280471 | 448 | |
ee11ad61 | 449 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 450 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
451 | pr_info("Trying to register already registered routing algorithm: %s\n", |
452 | bat_algo_ops->name); | |
5346c35e | 453 | ret = -EEXIST; |
1c280471 ML |
454 | goto out; |
455 | } | |
456 | ||
01c4224b | 457 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 458 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 459 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 460 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 461 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 462 | !bat_algo_ops->bat_ogm_schedule || |
c3e29312 | 463 | !bat_algo_ops->bat_ogm_emit) { |
01c4224b ML |
464 | pr_info("Routing algo '%s' does not implement required ops\n", |
465 | bat_algo_ops->name); | |
5346c35e | 466 | ret = -EINVAL; |
01c4224b ML |
467 | goto out; |
468 | } | |
469 | ||
1c280471 | 470 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 471 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 ML |
472 | ret = 0; |
473 | ||
474 | out: | |
475 | return ret; | |
476 | } | |
477 | ||
56303d34 | 478 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 479 | { |
56303d34 | 480 | struct batadv_algo_ops *bat_algo_ops; |
5346c35e | 481 | int ret = -EINVAL; |
1c280471 | 482 | |
ee11ad61 | 483 | bat_algo_ops = batadv_algo_get(name); |
1c280471 ML |
484 | if (!bat_algo_ops) |
485 | goto out; | |
486 | ||
487 | bat_priv->bat_algo_ops = bat_algo_ops; | |
488 | ret = 0; | |
489 | ||
490 | out: | |
491 | return ret; | |
492 | } | |
493 | ||
3193e8fd | 494 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 495 | { |
56303d34 | 496 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 497 | |
0c814653 | 498 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 499 | |
b67bfe0d | 500 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
1c280471 ML |
501 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
502 | } | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
95a066d8 SE |
507 | /** |
508 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
509 | * the header | |
510 | * @skb: skb pointing to fragmented socket buffers | |
511 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
512 | * marking the start of the data to be CRC'ed | |
513 | * | |
514 | * payload_ptr must always point to an address in the skb head buffer and not to | |
515 | * a fragment. | |
516 | */ | |
517 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
518 | { | |
519 | u32 crc = 0; | |
520 | unsigned int from; | |
521 | unsigned int to = skb->len; | |
522 | struct skb_seq_state st; | |
523 | const u8 *data; | |
524 | unsigned int len; | |
525 | unsigned int consumed = 0; | |
526 | ||
527 | from = (unsigned int)(payload_ptr - skb->data); | |
528 | ||
529 | skb_prepare_seq_read(skb, from, to, &st); | |
530 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
531 | crc = crc32c(crc, data, len); | |
532 | consumed += len; | |
533 | } | |
95a066d8 SE |
534 | |
535 | return htonl(crc); | |
536 | } | |
537 | ||
ee11ad61 | 538 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 539 | { |
56303d34 | 540 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
541 | char *algo_name = (char *)val; |
542 | size_t name_len = strlen(algo_name); | |
d419be1f | 543 | |
293c9c1c | 544 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
545 | algo_name[name_len - 1] = '\0'; |
546 | ||
ee11ad61 | 547 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 548 | if (!bat_algo_ops) { |
d8cb5486 | 549 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
550 | return -EINVAL; |
551 | } | |
552 | ||
d8cb5486 | 553 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
554 | } |
555 | ||
ee11ad61 SE |
556 | static const struct kernel_param_ops batadv_param_ops_ra = { |
557 | .set = batadv_param_set_ra, | |
d419be1f ML |
558 | .get = param_get_string, |
559 | }; | |
560 | ||
ee11ad61 | 561 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
562 | .maxlen = sizeof(batadv_routing_algo), |
563 | .string = batadv_routing_algo, | |
d419be1f ML |
564 | }; |
565 | ||
ee11ad61 SE |
566 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
567 | 0644); | |
568 | module_init(batadv_init); | |
569 | module_exit(batadv_exit); | |
c6c8fea2 SE |
570 | |
571 | MODULE_LICENSE("GPL"); | |
572 | ||
42d0b044 SE |
573 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
574 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
575 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
576 | MODULE_VERSION(BATADV_SOURCE_VERSION); |