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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(); |
6c519bad | 68 | batadv_nc_init(); |
c6c8fea2 | 69 | |
3193e8fd | 70 | batadv_event_workqueue = create_singlethread_workqueue("bat_events"); |
c6c8fea2 | 71 | |
3193e8fd | 72 | if (!batadv_event_workqueue) |
c6c8fea2 SE |
73 | return -ENOMEM; |
74 | ||
9039dc7e | 75 | batadv_socket_init(); |
40a072d7 | 76 | batadv_debugfs_init(); |
c6c8fea2 | 77 | |
9563877e | 78 | register_netdevice_notifier(&batadv_hard_if_notifier); |
a4ac28c0 | 79 | rtnl_link_register(&batadv_link_ops); |
c6c8fea2 | 80 | |
86ceb360 | 81 | pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", |
42d0b044 | 82 | BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); |
c6c8fea2 SE |
83 | |
84 | return 0; | |
85 | } | |
86 | ||
ee11ad61 | 87 | static void __exit batadv_exit(void) |
c6c8fea2 | 88 | { |
40a072d7 | 89 | batadv_debugfs_destroy(); |
a4ac28c0 | 90 | rtnl_link_unregister(&batadv_link_ops); |
9563877e SE |
91 | unregister_netdevice_notifier(&batadv_hard_if_notifier); |
92 | batadv_hardif_remove_interfaces(); | |
c6c8fea2 | 93 | |
3193e8fd SE |
94 | flush_workqueue(batadv_event_workqueue); |
95 | destroy_workqueue(batadv_event_workqueue); | |
96 | batadv_event_workqueue = NULL; | |
c6c8fea2 SE |
97 | |
98 | rcu_barrier(); | |
99 | } | |
100 | ||
3193e8fd | 101 | int batadv_mesh_init(struct net_device *soft_iface) |
c6c8fea2 | 102 | { |
56303d34 | 103 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
5346c35e | 104 | int ret; |
c6c8fea2 | 105 | |
c6c8fea2 SE |
106 | spin_lock_init(&bat_priv->forw_bat_list_lock); |
107 | spin_lock_init(&bat_priv->forw_bcast_list_lock); | |
807736f6 SE |
108 | spin_lock_init(&bat_priv->tt.changes_list_lock); |
109 | spin_lock_init(&bat_priv->tt.req_list_lock); | |
110 | spin_lock_init(&bat_priv->tt.roam_list_lock); | |
111 | spin_lock_init(&bat_priv->tt.last_changeset_lock); | |
112 | spin_lock_init(&bat_priv->gw.list_lock); | |
113 | spin_lock_init(&bat_priv->vis.hash_lock); | |
114 | spin_lock_init(&bat_priv->vis.list_lock); | |
c6c8fea2 SE |
115 | |
116 | INIT_HLIST_HEAD(&bat_priv->forw_bat_list); | |
117 | INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); | |
807736f6 SE |
118 | INIT_HLIST_HEAD(&bat_priv->gw.list); |
119 | INIT_LIST_HEAD(&bat_priv->tt.changes_list); | |
120 | INIT_LIST_HEAD(&bat_priv->tt.req_list); | |
121 | INIT_LIST_HEAD(&bat_priv->tt.roam_list); | |
c6c8fea2 | 122 | |
7d211efc | 123 | ret = batadv_originator_init(bat_priv); |
5346c35e | 124 | if (ret < 0) |
c6c8fea2 SE |
125 | goto err; |
126 | ||
08c36d3e | 127 | ret = batadv_tt_init(bat_priv); |
5346c35e | 128 | if (ret < 0) |
c6c8fea2 SE |
129 | goto err; |
130 | ||
42d0b044 SE |
131 | batadv_tt_local_add(soft_iface, soft_iface->dev_addr, |
132 | BATADV_NULL_IFINDEX); | |
c6c8fea2 | 133 | |
d0f714f4 | 134 | ret = batadv_vis_init(bat_priv); |
5346c35e | 135 | if (ret < 0) |
c6c8fea2 SE |
136 | goto err; |
137 | ||
08adf151 | 138 | ret = batadv_bla_init(bat_priv); |
5346c35e | 139 | if (ret < 0) |
23721387 SW |
140 | goto err; |
141 | ||
2f1dfbe1 AQ |
142 | ret = batadv_dat_init(bat_priv); |
143 | if (ret < 0) | |
144 | goto err; | |
145 | ||
6c519bad | 146 | ret = batadv_nc_mesh_init(bat_priv); |
d353d8d4 MH |
147 | if (ret < 0) |
148 | goto err; | |
149 | ||
807736f6 | 150 | atomic_set(&bat_priv->gw.reselect, 0); |
39c75a51 | 151 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); |
5346c35e SE |
152 | |
153 | return 0; | |
c6c8fea2 SE |
154 | |
155 | err: | |
3193e8fd | 156 | batadv_mesh_free(soft_iface); |
5346c35e | 157 | return ret; |
c6c8fea2 SE |
158 | } |
159 | ||
3193e8fd | 160 | void batadv_mesh_free(struct net_device *soft_iface) |
c6c8fea2 | 161 | { |
56303d34 | 162 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
c6c8fea2 | 163 | |
39c75a51 | 164 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); |
c6c8fea2 | 165 | |
9455e34c | 166 | batadv_purge_outstanding_packets(bat_priv, NULL); |
c6c8fea2 | 167 | |
d0f714f4 | 168 | batadv_vis_quit(bat_priv); |
c6c8fea2 | 169 | |
7cf06bc6 | 170 | batadv_gw_node_purge(bat_priv); |
6c519bad | 171 | batadv_nc_mesh_free(bat_priv); |
a4361860 AQ |
172 | batadv_dat_free(bat_priv); |
173 | batadv_bla_free(bat_priv); | |
c6c8fea2 | 174 | |
a4361860 AQ |
175 | /* Free the TT and the originator tables only after having terminated |
176 | * all the other depending components which may use these structures for | |
177 | * their purposes. | |
178 | */ | |
08c36d3e | 179 | batadv_tt_free(bat_priv); |
c6c8fea2 | 180 | |
a4361860 AQ |
181 | /* Since the originator table clean up routine is accessing the TT |
182 | * tables as well, it has to be invoked after the TT tables have been | |
183 | * freed and marked as empty. This ensures that no cleanup RCU callbacks | |
184 | * accessing the TT data are scheduled for later execution. | |
185 | */ | |
186 | batadv_originator_free(bat_priv); | |
2f1dfbe1 | 187 | |
f8214865 | 188 | free_percpu(bat_priv->bat_counters); |
f69ae770 | 189 | bat_priv->bat_counters = NULL; |
f8214865 | 190 | |
39c75a51 | 191 | atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
c6c8fea2 SE |
192 | } |
193 | ||
6e0895c2 DM |
194 | /** |
195 | * batadv_is_my_mac - check if the given mac address belongs to any of the real | |
196 | * interfaces in the current mesh | |
197 | * @bat_priv: the bat priv with all the soft interface information | |
198 | * @addr: the address to check | |
199 | */ | |
fe8a93b9 | 200 | int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr) |
c6c8fea2 | 201 | { |
56303d34 | 202 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
203 | |
204 | rcu_read_lock(); | |
3193e8fd | 205 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 | 206 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
c6c8fea2 SE |
207 | continue; |
208 | ||
fe8a93b9 AQ |
209 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
210 | continue; | |
211 | ||
1eda58bf | 212 | if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { |
c6c8fea2 SE |
213 | rcu_read_unlock(); |
214 | return 1; | |
215 | } | |
216 | } | |
217 | rcu_read_unlock(); | |
218 | return 0; | |
c6c8fea2 SE |
219 | } |
220 | ||
30da63a6 ML |
221 | /** |
222 | * batadv_seq_print_text_primary_if_get - called from debugfs table printing | |
223 | * function that requires the primary interface | |
224 | * @seq: debugfs table seq_file struct | |
225 | * | |
226 | * Returns primary interface if found or NULL otherwise. | |
227 | */ | |
228 | struct batadv_hard_iface * | |
229 | batadv_seq_print_text_primary_if_get(struct seq_file *seq) | |
230 | { | |
231 | struct net_device *net_dev = (struct net_device *)seq->private; | |
232 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
233 | struct batadv_hard_iface *primary_if; | |
234 | ||
235 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
236 | ||
237 | if (!primary_if) { | |
238 | seq_printf(seq, | |
239 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
240 | net_dev->name); | |
241 | goto out; | |
242 | } | |
243 | ||
244 | if (primary_if->if_status == BATADV_IF_ACTIVE) | |
245 | goto out; | |
246 | ||
247 | seq_printf(seq, | |
248 | "BATMAN mesh %s disabled - primary interface not active\n", | |
249 | net_dev->name); | |
250 | batadv_hardif_free_ref(primary_if); | |
251 | primary_if = NULL; | |
252 | ||
253 | out: | |
254 | return primary_if; | |
255 | } | |
256 | ||
c54f38c9 SW |
257 | /** |
258 | * batadv_skb_set_priority - sets skb priority according to packet content | |
259 | * @skb: the packet to be sent | |
260 | * @offset: offset to the packet content | |
261 | * | |
262 | * This function sets a value between 256 and 263 (802.1d priority), which | |
263 | * can be interpreted by the cfg80211 or other drivers. | |
264 | */ | |
265 | void batadv_skb_set_priority(struct sk_buff *skb, int offset) | |
266 | { | |
267 | struct iphdr ip_hdr_tmp, *ip_hdr; | |
268 | struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; | |
269 | struct ethhdr ethhdr_tmp, *ethhdr; | |
270 | struct vlan_ethhdr *vhdr, vhdr_tmp; | |
271 | u32 prio; | |
272 | ||
273 | /* already set, do nothing */ | |
274 | if (skb->priority >= 256 && skb->priority <= 263) | |
275 | return; | |
276 | ||
277 | ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); | |
278 | if (!ethhdr) | |
279 | return; | |
280 | ||
281 | switch (ethhdr->h_proto) { | |
282 | case htons(ETH_P_8021Q): | |
283 | vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), | |
284 | sizeof(*vhdr), &vhdr_tmp); | |
285 | if (!vhdr) | |
286 | return; | |
287 | prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; | |
288 | prio = prio >> VLAN_PRIO_SHIFT; | |
289 | break; | |
290 | case htons(ETH_P_IP): | |
291 | ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
292 | sizeof(*ip_hdr), &ip_hdr_tmp); | |
293 | if (!ip_hdr) | |
294 | return; | |
295 | prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; | |
296 | break; | |
297 | case htons(ETH_P_IPV6): | |
298 | ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), | |
299 | sizeof(*ip6_hdr), &ip6_hdr_tmp); | |
300 | if (!ip6_hdr) | |
301 | return; | |
302 | prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; | |
303 | break; | |
304 | default: | |
305 | return; | |
306 | } | |
307 | ||
308 | skb->priority = prio + 256; | |
309 | } | |
310 | ||
ee11ad61 | 311 | static int batadv_recv_unhandled_packet(struct sk_buff *skb, |
56303d34 | 312 | struct batadv_hard_iface *recv_if) |
ffa995e0 ML |
313 | { |
314 | return NET_RX_DROP; | |
315 | } | |
316 | ||
317 | /* incoming packets with the batman ethertype received on any active hard | |
318 | * interface | |
319 | */ | |
3193e8fd SE |
320 | int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
321 | struct packet_type *ptype, | |
322 | struct net_device *orig_dev) | |
ffa995e0 | 323 | { |
56303d34 | 324 | struct batadv_priv *bat_priv; |
96412690 | 325 | struct batadv_ogm_packet *batadv_ogm_packet; |
56303d34 | 326 | struct batadv_hard_iface *hard_iface; |
ffa995e0 ML |
327 | uint8_t idx; |
328 | int ret; | |
329 | ||
56303d34 SE |
330 | hard_iface = container_of(ptype, struct batadv_hard_iface, |
331 | batman_adv_ptype); | |
ffa995e0 ML |
332 | skb = skb_share_check(skb, GFP_ATOMIC); |
333 | ||
334 | /* skb was released by skb_share_check() */ | |
335 | if (!skb) | |
336 | goto err_out; | |
337 | ||
338 | /* packet should hold at least type and version */ | |
339 | if (unlikely(!pskb_may_pull(skb, 2))) | |
340 | goto err_free; | |
341 | ||
342 | /* expect a valid ethernet header here. */ | |
343 | if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) | |
344 | goto err_free; | |
345 | ||
346 | if (!hard_iface->soft_iface) | |
347 | goto err_free; | |
348 | ||
349 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
350 | ||
39c75a51 | 351 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
ffa995e0 ML |
352 | goto err_free; |
353 | ||
354 | /* discard frames on not active interfaces */ | |
e9a4f295 | 355 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
ffa995e0 ML |
356 | goto err_free; |
357 | ||
96412690 | 358 | batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; |
ffa995e0 | 359 | |
96412690 | 360 | if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
39c75a51 | 361 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 362 | "Drop packet: incompatible batman version (%i)\n", |
96412690 | 363 | batadv_ogm_packet->header.version); |
ffa995e0 ML |
364 | goto err_free; |
365 | } | |
366 | ||
367 | /* all receive handlers return whether they received or reused | |
368 | * the supplied skb. if not, we have to free the skb. | |
369 | */ | |
96412690 | 370 | idx = batadv_ogm_packet->header.packet_type; |
ee11ad61 | 371 | ret = (*batadv_rx_handler[idx])(skb, hard_iface); |
ffa995e0 ML |
372 | |
373 | if (ret == NET_RX_DROP) | |
374 | kfree_skb(skb); | |
375 | ||
376 | /* return NET_RX_SUCCESS in any case as we | |
377 | * most probably dropped the packet for | |
378 | * routing-logical reasons. | |
379 | */ | |
380 | return NET_RX_SUCCESS; | |
381 | ||
382 | err_free: | |
383 | kfree_skb(skb); | |
384 | err_out: | |
385 | return NET_RX_DROP; | |
386 | } | |
387 | ||
ee11ad61 | 388 | static void batadv_recv_handler_init(void) |
ffa995e0 ML |
389 | { |
390 | int i; | |
391 | ||
ee11ad61 SE |
392 | for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) |
393 | batadv_rx_handler[i] = batadv_recv_unhandled_packet; | |
ffa995e0 | 394 | |
ffa995e0 | 395 | /* batman icmp packet */ |
acd34afa | 396 | batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; |
7cdcf6dd AQ |
397 | /* unicast with 4 addresses packet */ |
398 | batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; | |
ffa995e0 | 399 | /* unicast packet */ |
acd34afa | 400 | batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; |
ffa995e0 | 401 | /* fragmented unicast packet */ |
acd34afa | 402 | batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet; |
ffa995e0 | 403 | /* broadcast packet */ |
acd34afa | 404 | batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; |
ffa995e0 | 405 | /* vis packet */ |
acd34afa | 406 | batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet; |
ffa995e0 | 407 | /* Translation table query (request or response) */ |
acd34afa | 408 | batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query; |
ffa995e0 | 409 | /* Roaming advertisement */ |
acd34afa | 410 | batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv; |
ffa995e0 ML |
411 | } |
412 | ||
56303d34 SE |
413 | int |
414 | batadv_recv_handler_register(uint8_t packet_type, | |
415 | int (*recv_handler)(struct sk_buff *, | |
416 | struct batadv_hard_iface *)) | |
ffa995e0 | 417 | { |
ee11ad61 | 418 | if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet) |
ffa995e0 ML |
419 | return -EBUSY; |
420 | ||
ee11ad61 | 421 | batadv_rx_handler[packet_type] = recv_handler; |
ffa995e0 ML |
422 | return 0; |
423 | } | |
424 | ||
3193e8fd | 425 | void batadv_recv_handler_unregister(uint8_t packet_type) |
ffa995e0 | 426 | { |
ee11ad61 | 427 | batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; |
ffa995e0 ML |
428 | } |
429 | ||
56303d34 | 430 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
1c280471 | 431 | { |
56303d34 | 432 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
1c280471 | 433 | |
b67bfe0d | 434 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
1c280471 ML |
435 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
436 | continue; | |
437 | ||
438 | bat_algo_ops = bat_algo_ops_tmp; | |
439 | break; | |
440 | } | |
441 | ||
442 | return bat_algo_ops; | |
443 | } | |
444 | ||
56303d34 | 445 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
1c280471 | 446 | { |
56303d34 | 447 | struct batadv_algo_ops *bat_algo_ops_tmp; |
5346c35e | 448 | int ret; |
1c280471 | 449 | |
ee11ad61 | 450 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
1c280471 | 451 | if (bat_algo_ops_tmp) { |
86ceb360 SE |
452 | pr_info("Trying to register already registered routing algorithm: %s\n", |
453 | bat_algo_ops->name); | |
5346c35e | 454 | ret = -EEXIST; |
1c280471 ML |
455 | goto out; |
456 | } | |
457 | ||
01c4224b | 458 | /* all algorithms must implement all ops (for now) */ |
c2aca022 | 459 | if (!bat_algo_ops->bat_iface_enable || |
00a50076 | 460 | !bat_algo_ops->bat_iface_disable || |
c3229398 | 461 | !bat_algo_ops->bat_iface_update_mac || |
cd8b78e7 | 462 | !bat_algo_ops->bat_primary_iface_set || |
01c4224b | 463 | !bat_algo_ops->bat_ogm_schedule || |
c3e29312 | 464 | !bat_algo_ops->bat_ogm_emit) { |
01c4224b ML |
465 | pr_info("Routing algo '%s' does not implement required ops\n", |
466 | bat_algo_ops->name); | |
5346c35e | 467 | ret = -EINVAL; |
01c4224b ML |
468 | goto out; |
469 | } | |
470 | ||
1c280471 | 471 | INIT_HLIST_NODE(&bat_algo_ops->list); |
ee11ad61 | 472 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
1c280471 ML |
473 | ret = 0; |
474 | ||
475 | out: | |
476 | return ret; | |
477 | } | |
478 | ||
56303d34 | 479 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
1c280471 | 480 | { |
56303d34 | 481 | struct batadv_algo_ops *bat_algo_ops; |
5346c35e | 482 | int ret = -EINVAL; |
1c280471 | 483 | |
ee11ad61 | 484 | bat_algo_ops = batadv_algo_get(name); |
1c280471 ML |
485 | if (!bat_algo_ops) |
486 | goto out; | |
487 | ||
488 | bat_priv->bat_algo_ops = bat_algo_ops; | |
489 | ret = 0; | |
490 | ||
491 | out: | |
492 | return ret; | |
493 | } | |
494 | ||
3193e8fd | 495 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
1c280471 | 496 | { |
56303d34 | 497 | struct batadv_algo_ops *bat_algo_ops; |
1c280471 | 498 | |
0c814653 | 499 | seq_puts(seq, "Available routing algorithms:\n"); |
1c280471 | 500 | |
b67bfe0d | 501 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
1c280471 ML |
502 | seq_printf(seq, "%s\n", bat_algo_ops->name); |
503 | } | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
95a066d8 SE |
508 | /** |
509 | * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in | |
510 | * the header | |
511 | * @skb: skb pointing to fragmented socket buffers | |
512 | * @payload_ptr: Pointer to position inside the head buffer of the skb | |
513 | * marking the start of the data to be CRC'ed | |
514 | * | |
515 | * payload_ptr must always point to an address in the skb head buffer and not to | |
516 | * a fragment. | |
517 | */ | |
518 | __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) | |
519 | { | |
520 | u32 crc = 0; | |
521 | unsigned int from; | |
522 | unsigned int to = skb->len; | |
523 | struct skb_seq_state st; | |
524 | const u8 *data; | |
525 | unsigned int len; | |
526 | unsigned int consumed = 0; | |
527 | ||
528 | from = (unsigned int)(payload_ptr - skb->data); | |
529 | ||
530 | skb_prepare_seq_read(skb, from, to, &st); | |
531 | while ((len = skb_seq_read(consumed, &data, &st)) != 0) { | |
532 | crc = crc32c(crc, data, len); | |
533 | consumed += len; | |
534 | } | |
95a066d8 SE |
535 | |
536 | return htonl(crc); | |
537 | } | |
538 | ||
ee11ad61 | 539 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
d419be1f | 540 | { |
56303d34 | 541 | struct batadv_algo_ops *bat_algo_ops; |
d8cb5486 ML |
542 | char *algo_name = (char *)val; |
543 | size_t name_len = strlen(algo_name); | |
d419be1f | 544 | |
293c9c1c | 545 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
d8cb5486 ML |
546 | algo_name[name_len - 1] = '\0'; |
547 | ||
ee11ad61 | 548 | bat_algo_ops = batadv_algo_get(algo_name); |
d419be1f | 549 | if (!bat_algo_ops) { |
d8cb5486 | 550 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
d419be1f ML |
551 | return -EINVAL; |
552 | } | |
553 | ||
d8cb5486 | 554 | return param_set_copystring(algo_name, kp); |
d419be1f ML |
555 | } |
556 | ||
ee11ad61 SE |
557 | static const struct kernel_param_ops batadv_param_ops_ra = { |
558 | .set = batadv_param_set_ra, | |
d419be1f ML |
559 | .get = param_get_string, |
560 | }; | |
561 | ||
ee11ad61 | 562 | static struct kparam_string batadv_param_string_ra = { |
3193e8fd SE |
563 | .maxlen = sizeof(batadv_routing_algo), |
564 | .string = batadv_routing_algo, | |
d419be1f ML |
565 | }; |
566 | ||
ee11ad61 SE |
567 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
568 | 0644); | |
569 | module_init(batadv_init); | |
570 | module_exit(batadv_exit); | |
c6c8fea2 SE |
571 | |
572 | MODULE_LICENSE("GPL"); | |
573 | ||
42d0b044 SE |
574 | MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); |
575 | MODULE_DESCRIPTION(BATADV_DRIVER_DESC); | |
576 | MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE); | |
577 | MODULE_VERSION(BATADV_SOURCE_VERSION); |