1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich
5 */
6
7 #include "main.h"
8
9 #include <linux/byteorder/generic.h>
10 #include <linux/container_of.h>
11 #include <linux/etherdevice.h>
12 #include <linux/gfp.h>
13 #include <linux/if_ether.h>
14 #include <linux/kref.h>
15 #include <linux/list.h>
16 #include <linux/lockdep.h>
17 #include <linux/netdevice.h>
18 #include <linux/pkt_sched.h>
19 #include <linux/rculist.h>
20 #include <linux/rcupdate.h>
21 #include <linux/skbuff.h>
22 #include <linux/slab.h>
23 #include <linux/spinlock.h>
24 #include <linux/stddef.h>
25 #include <linux/string.h>
26 #include <linux/types.h>
27 #include <uapi/linux/batadv_packet.h>
28
29 #include "originator.h"
30 #include "send.h"
31 #include "tvlv.h"
32
33 /**
34 * batadv_tvlv_handler_release() - release tvlv handler from lists and queue for
35 * free after rcu grace period
36 * @ref: kref pointer of the tvlv
37 */
38 static void batadv_tvlv_handler_release(struct kref *ref)
39 {
40 struct batadv_tvlv_handler *tvlv_handler;
41
42 tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount);
43 kfree_rcu(tvlv_handler, rcu);
44 }
45
46 /**
47 * batadv_tvlv_handler_put() - decrement the tvlv container refcounter and
48 * possibly release it
49 * @tvlv_handler: the tvlv handler to free
50 */
51 static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler)
52 {
53 if (!tvlv_handler)
54 return;
55
56 kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release);
57 }
58
59 /**
60 * batadv_tvlv_handler_get() - retrieve tvlv handler from the tvlv handler list
61 * based on the provided type and version (both need to match)
62 * @bat_priv: the bat priv with all the soft interface information
63 * @type: tvlv handler type to look for
64 * @version: tvlv handler version to look for
65 *
66 * Return: tvlv handler if found or NULL otherwise.
67 */
68 static struct batadv_tvlv_handler *
69 batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version)
70 {
71 struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL;
72
73 rcu_read_lock();
74 hlist_for_each_entry_rcu(tvlv_handler_tmp,
75 &bat_priv->tvlv.handler_list, list) {
76 if (tvlv_handler_tmp->type != type)
77 continue;
78
79 if (tvlv_handler_tmp->version != version)
80 continue;
81
82 if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount))
83 continue;
84
85 tvlv_handler = tvlv_handler_tmp;
86 break;
87 }
88 rcu_read_unlock();
89
90 return tvlv_handler;
91 }
92
93 /**
94 * batadv_tvlv_container_release() - release tvlv from lists and free
95 * @ref: kref pointer of the tvlv
96 */
97 static void batadv_tvlv_container_release(struct kref *ref)
98 {
99 struct batadv_tvlv_container *tvlv;
100
101 tvlv = container_of(ref, struct batadv_tvlv_container, refcount);
102 kfree(tvlv);
103 }
104
105 /**
106 * batadv_tvlv_container_put() - decrement the tvlv container refcounter and
107 * possibly release it
108 * @tvlv: the tvlv container to free
109 */
110 static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv)
111 {
112 if (!tvlv)
113 return;
114
115 kref_put(&tvlv->refcount, batadv_tvlv_container_release);
116 }
117
118 /**
119 * batadv_tvlv_container_get() - retrieve tvlv container from the tvlv container
120 * list based on the provided type and version (both need to match)
121 * @bat_priv: the bat priv with all the soft interface information
122 * @type: tvlv container type to look for
123 * @version: tvlv container version to look for
124 *
125 * Has to be called with the appropriate locks being acquired
126 * (tvlv.container_list_lock).
127 *
128 * Return: tvlv container if found or NULL otherwise.
129 */
130 static struct batadv_tvlv_container *
131 batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version)
132 {
133 struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL;
134
135 lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
136
137 hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) {
138 if (tvlv_tmp->tvlv_hdr.type != type)
139 continue;
140
141 if (tvlv_tmp->tvlv_hdr.version != version)
142 continue;
143
144 kref_get(&tvlv_tmp->refcount);
145 tvlv = tvlv_tmp;
146 break;
147 }
148
149 return tvlv;
150 }
151
152 /**
153 * batadv_tvlv_container_list_size() - calculate the size of the tvlv container
154 * list entries
155 * @bat_priv: the bat priv with all the soft interface information
156 *
157 * Has to be called with the appropriate locks being acquired
158 * (tvlv.container_list_lock).
159 *
160 * Return: size of all currently registered tvlv containers in bytes.
161 */
162 static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv)
163 {
164 struct batadv_tvlv_container *tvlv;
165 u16 tvlv_len = 0;
166
167 lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
168
169 hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
170 tvlv_len += sizeof(struct batadv_tvlv_hdr);
171 tvlv_len += ntohs(tvlv->tvlv_hdr.len);
172 }
173
174 return tvlv_len;
175 }
176
177 /**
178 * batadv_tvlv_container_remove() - remove tvlv container from the tvlv
179 * container list
180 * @bat_priv: the bat priv with all the soft interface information
181 * @tvlv: the to be removed tvlv container
182 *
183 * Has to be called with the appropriate locks being acquired
184 * (tvlv.container_list_lock).
185 */
186 static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv,
187 struct batadv_tvlv_container *tvlv)
188 {
189 lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
190
191 if (!tvlv)
192 return;
193
194 hlist_del(&tvlv->list);
195
196 /* first call to decrement the counter, second call to free */
197 batadv_tvlv_container_put(tvlv);
198 batadv_tvlv_container_put(tvlv);
199 }
200
201 /**
202 * batadv_tvlv_container_unregister() - unregister tvlv container based on the
203 * provided type and version (both need to match)
204 * @bat_priv: the bat priv with all the soft interface information
205 * @type: tvlv container type to unregister
206 * @version: tvlv container type to unregister
207 */
208 void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
209 u8 type, u8 version)
210 {
211 struct batadv_tvlv_container *tvlv;
212
213 spin_lock_bh(&bat_priv->tvlv.container_list_lock);
214 tvlv = batadv_tvlv_container_get(bat_priv, type, version);
215 batadv_tvlv_container_remove(bat_priv, tvlv);
216 spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
217 }
218
219 /**
220 * batadv_tvlv_container_register() - register tvlv type, version and content
221 * to be propagated with each (primary interface) OGM
222 * @bat_priv: the bat priv with all the soft interface information
223 * @type: tvlv container type
224 * @version: tvlv container version
225 * @tvlv_value: tvlv container content
226 * @tvlv_value_len: tvlv container content length
227 *
228 * If a container of the same type and version was already registered the new
229 * content is going to replace the old one.
230 */
231 void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
232 u8 type, u8 version,
233 void *tvlv_value, u16 tvlv_value_len)
234 {
235 struct batadv_tvlv_container *tvlv_old, *tvlv_new;
236
237 if (!tvlv_value)
238 tvlv_value_len = 0;
239
240 tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC);
241 if (!tvlv_new)
242 return;
243
244 tvlv_new->tvlv_hdr.version = version;
245 tvlv_new->tvlv_hdr.type = type;
246 tvlv_new->tvlv_hdr.len = htons(tvlv_value_len);
247
248 memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len));
249 INIT_HLIST_NODE(&tvlv_new->list);
250 kref_init(&tvlv_new->refcount);
251
252 spin_lock_bh(&bat_priv->tvlv.container_list_lock);
253 tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
254 batadv_tvlv_container_remove(bat_priv, tvlv_old);
255
256 kref_get(&tvlv_new->refcount);
257 hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list);
258 spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
259
260 /* don't return reference to new tvlv_container */
261 batadv_tvlv_container_put(tvlv_new);
262 }
263
264 /**
265 * batadv_tvlv_realloc_packet_buff() - reallocate packet buffer to accommodate
266 * requested packet size
267 * @packet_buff: packet buffer
268 * @packet_buff_len: packet buffer size
269 * @min_packet_len: requested packet minimum size
270 * @additional_packet_len: requested additional packet size on top of minimum
271 * size
272 *
273 * Return: true of the packet buffer could be changed to the requested size,
274 * false otherwise.
275 */
276 static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff,
277 int *packet_buff_len,
278 int min_packet_len,
279 int additional_packet_len)
280 {
281 unsigned char *new_buff;
282
283 new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC);
284
285 /* keep old buffer if kmalloc should fail */
286 if (!new_buff)
287 return false;
288
289 memcpy(new_buff, *packet_buff, min_packet_len);
290 kfree(*packet_buff);
291 *packet_buff = new_buff;
292 *packet_buff_len = min_packet_len + additional_packet_len;
293
294 return true;
295 }
296
297 /**
298 * batadv_tvlv_container_ogm_append() - append tvlv container content to given
299 * OGM packet buffer
300 * @bat_priv: the bat priv with all the soft interface information
301 * @packet_buff: ogm packet buffer
302 * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
303 * content
304 * @packet_min_len: ogm header size to be preserved for the OGM itself
305 *
306 * The ogm packet might be enlarged or shrunk depending on the current size
307 * and the size of the to-be-appended tvlv containers.
308 *
309 * Return: size of all appended tvlv containers in bytes.
310 */
311 u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
312 unsigned char **packet_buff,
313 int *packet_buff_len, int packet_min_len)
314 {
315 struct batadv_tvlv_container *tvlv;
316 struct batadv_tvlv_hdr *tvlv_hdr;
317 u16 tvlv_value_len;
318 void *tvlv_value;
319 bool ret;
320
321 spin_lock_bh(&bat_priv->tvlv.container_list_lock);
322 tvlv_value_len = batadv_tvlv_container_list_size(bat_priv);
323
324 ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len,
325 packet_min_len, tvlv_value_len);
326
327 if (!ret)
328 goto end;
329
330 if (!tvlv_value_len)
331 goto end;
332
333 tvlv_value = (*packet_buff) + packet_min_len;
334
335 hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
336 tvlv_hdr = tvlv_value;
337 tvlv_hdr->type = tvlv->tvlv_hdr.type;
338 tvlv_hdr->version = tvlv->tvlv_hdr.version;
339 tvlv_hdr->len = tvlv->tvlv_hdr.len;
340 tvlv_value = tvlv_hdr + 1;
341 memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len));
342 tvlv_value = (u8 *)tvlv_value + ntohs(tvlv->tvlv_hdr.len);
343 }
344
345 end:
346 spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
347 return tvlv_value_len;
348 }
349
350 /**
351 * batadv_tvlv_call_handler() - parse the given tvlv buffer to call the
352 * appropriate handlers
353 * @bat_priv: the bat priv with all the soft interface information
354 * @tvlv_handler: tvlv callback function handling the tvlv content
355 * @packet_type: indicates for which packet type the TVLV handler is called
356 * @orig_node: orig node emitting the ogm packet
357 * @skb: the skb the TVLV handler is called for
358 * @tvlv_value: tvlv content
359 * @tvlv_value_len: tvlv content length
360 *
361 * Return: success if the handler was not found or the return value of the
362 * handler callback.
363 */
364 static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
365 struct batadv_tvlv_handler *tvlv_handler,
366 u8 packet_type,
367 struct batadv_orig_node *orig_node,
368 struct sk_buff *skb, void *tvlv_value,
369 u16 tvlv_value_len)
370 {
371 unsigned int tvlv_offset;
372 u8 *src, *dst;
373
374 if (!tvlv_handler)
375 return NET_RX_SUCCESS;
376
377 switch (packet_type) {
378 case BATADV_IV_OGM:
379 case BATADV_OGM2:
380 if (!tvlv_handler->ogm_handler)
381 return NET_RX_SUCCESS;
382
383 if (!orig_node)
384 return NET_RX_SUCCESS;
385
386 tvlv_handler->ogm_handler(bat_priv, orig_node,
387 BATADV_NO_FLAGS,
388 tvlv_value, tvlv_value_len);
389 tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED;
390 break;
391 case BATADV_UNICAST_TVLV:
392 if (!skb)
393 return NET_RX_SUCCESS;
394
395 if (!tvlv_handler->unicast_handler)
396 return NET_RX_SUCCESS;
397
398 src = ((struct batadv_unicast_tvlv_packet *)skb->data)->src;
399 dst = ((struct batadv_unicast_tvlv_packet *)skb->data)->dst;
400
401 return tvlv_handler->unicast_handler(bat_priv, src,
402 dst, tvlv_value,
403 tvlv_value_len);
404 case BATADV_MCAST:
405 if (!skb)
406 return NET_RX_SUCCESS;
407
408 if (!tvlv_handler->mcast_handler)
409 return NET_RX_SUCCESS;
410
411 tvlv_offset = (unsigned char *)tvlv_value - skb->data;
412 skb_set_network_header(skb, tvlv_offset);
413 skb_set_transport_header(skb, tvlv_offset + tvlv_value_len);
414
415 return tvlv_handler->mcast_handler(bat_priv, skb);
416 }
417
418 return NET_RX_SUCCESS;
419 }
420
421 /**
422 * batadv_tvlv_containers_process() - parse the given tvlv buffer to call the
423 * appropriate handlers
424 * @bat_priv: the bat priv with all the soft interface information
425 * @packet_type: indicates for which packet type the TVLV handler is called
426 * @orig_node: orig node emitting the ogm packet
427 * @skb: the skb the TVLV handler is called for
428 * @tvlv_value: tvlv content
429 * @tvlv_value_len: tvlv content length
430 *
431 * Return: success when processing an OGM or the return value of all called
432 * handler callbacks.
433 */
434 int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
435 u8 packet_type,
436 struct batadv_orig_node *orig_node,
437 struct sk_buff *skb, void *tvlv_value,
438 u16 tvlv_value_len)
439 {
440 struct batadv_tvlv_handler *tvlv_handler;
441 struct batadv_tvlv_hdr *tvlv_hdr;
442 u16 tvlv_value_cont_len;
443 u8 cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND;
444 int ret = NET_RX_SUCCESS;
445
446 while (tvlv_value_len >= sizeof(*tvlv_hdr)) {
447 tvlv_hdr = tvlv_value;
448 tvlv_value_cont_len = ntohs(tvlv_hdr->len);
449 tvlv_value = tvlv_hdr + 1;
450 tvlv_value_len -= sizeof(*tvlv_hdr);
451
452 if (tvlv_value_cont_len > tvlv_value_len)
453 break;
454
455 tvlv_handler = batadv_tvlv_handler_get(bat_priv,
456 tvlv_hdr->type,
457 tvlv_hdr->version);
458
459 ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler,
460 packet_type, orig_node, skb,
461 tvlv_value,
462 tvlv_value_cont_len);
463 batadv_tvlv_handler_put(tvlv_handler);
464 tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len;
465 tvlv_value_len -= tvlv_value_cont_len;
466 }
467
468 if (packet_type != BATADV_IV_OGM &&
469 packet_type != BATADV_OGM2)
470 return ret;
471
472 rcu_read_lock();
473 hlist_for_each_entry_rcu(tvlv_handler,
474 &bat_priv->tvlv.handler_list, list) {
475 if (!tvlv_handler->ogm_handler)
476 continue;
477
478 if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) &&
479 !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED))
480 tvlv_handler->ogm_handler(bat_priv, orig_node,
481 cifnotfound, NULL, 0);
482
483 tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED;
484 }
485 rcu_read_unlock();
486
487 return NET_RX_SUCCESS;
488 }
489
490 /**
491 * batadv_tvlv_ogm_receive() - process an incoming ogm and call the appropriate
492 * handlers
493 * @bat_priv: the bat priv with all the soft interface information
494 * @batadv_ogm_packet: ogm packet containing the tvlv containers
495 * @orig_node: orig node emitting the ogm packet
496 */
497 void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
498 struct batadv_ogm_packet *batadv_ogm_packet,
499 struct batadv_orig_node *orig_node)
500 {
501 void *tvlv_value;
502 u16 tvlv_value_len;
503
504 if (!batadv_ogm_packet)
505 return;
506
507 tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len);
508 if (!tvlv_value_len)
509 return;
510
511 tvlv_value = batadv_ogm_packet + 1;
512
513 batadv_tvlv_containers_process(bat_priv, BATADV_IV_OGM, orig_node, NULL,
514 tvlv_value, tvlv_value_len);
515 }
516
517 /**
518 * batadv_tvlv_handler_register() - register tvlv handler based on the provided
519 * type and version (both need to match) for ogm tvlv payload and/or unicast
520 * payload
521 * @bat_priv: the bat priv with all the soft interface information
522 * @optr: ogm tvlv handler callback function. This function receives the orig
523 * node, flags and the tvlv content as argument to process.
524 * @uptr: unicast tvlv handler callback function. This function receives the
525 * source & destination of the unicast packet as well as the tvlv content
526 * to process.
527 * @mptr: multicast packet tvlv handler callback function. This function
528 * receives the full skb to process, with the skb network header pointing
529 * to the current tvlv and the skb transport header pointing to the first
530 * byte after the current tvlv.
531 * @type: tvlv handler type to be registered
532 * @version: tvlv handler version to be registered
533 * @flags: flags to enable or disable TVLV API behavior
534 */
535 void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
536 void (*optr)(struct batadv_priv *bat_priv,
537 struct batadv_orig_node *orig,
538 u8 flags,
539 void *tvlv_value,
540 u16 tvlv_value_len),
541 int (*uptr)(struct batadv_priv *bat_priv,
542 u8 *src, u8 *dst,
543 void *tvlv_value,
544 u16 tvlv_value_len),
545 int (*mptr)(struct batadv_priv *bat_priv,
546 struct sk_buff *skb),
547 u8 type, u8 version, u8 flags)
548 {
549 struct batadv_tvlv_handler *tvlv_handler;
550
551 spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
552
553 tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
554 if (tvlv_handler) {
555 spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
556 batadv_tvlv_handler_put(tvlv_handler);
557 return;
558 }
559
560 tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC);
561 if (!tvlv_handler) {
562 spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
563 return;
564 }
565
566 tvlv_handler->ogm_handler = optr;
567 tvlv_handler->unicast_handler = uptr;
568 tvlv_handler->mcast_handler = mptr;
569 tvlv_handler->type = type;
570 tvlv_handler->version = version;
571 tvlv_handler->flags = flags;
572 kref_init(&tvlv_handler->refcount);
573 INIT_HLIST_NODE(&tvlv_handler->list);
574
575 kref_get(&tvlv_handler->refcount);
576 hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list);
577 spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
578
579 /* don't return reference to new tvlv_handler */
580 batadv_tvlv_handler_put(tvlv_handler);
581 }
582
583 /**
584 * batadv_tvlv_handler_unregister() - unregister tvlv handler based on the
585 * provided type and version (both need to match)
586 * @bat_priv: the bat priv with all the soft interface information
587 * @type: tvlv handler type to be unregistered
588 * @version: tvlv handler version to be unregistered
589 */
590 void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
591 u8 type, u8 version)
592 {
593 struct batadv_tvlv_handler *tvlv_handler;
594
595 tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
596 if (!tvlv_handler)
597 return;
598
599 batadv_tvlv_handler_put(tvlv_handler);
600 spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
601 hlist_del_rcu(&tvlv_handler->list);
602 spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
603 batadv_tvlv_handler_put(tvlv_handler);
604 }
605
606 /**
607 * batadv_tvlv_unicast_send() - send a unicast packet with tvlv payload to the
608 * specified host
609 * @bat_priv: the bat priv with all the soft interface information
610 * @src: source mac address of the unicast packet
611 * @dst: destination mac address of the unicast packet
612 * @type: tvlv type
613 * @version: tvlv version
614 * @tvlv_value: tvlv content
615 * @tvlv_value_len: tvlv content length
616 */
617 void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, const u8 *src,
618 const u8 *dst, u8 type, u8 version,
619 void *tvlv_value, u16 tvlv_value_len)
620 {
621 struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
622 struct batadv_tvlv_hdr *tvlv_hdr;
623 struct batadv_orig_node *orig_node;
624 struct sk_buff *skb;
625 unsigned char *tvlv_buff;
626 unsigned int tvlv_len;
627 ssize_t hdr_len = sizeof(*unicast_tvlv_packet);
628
629 orig_node = batadv_orig_hash_find(bat_priv, dst);
630 if (!orig_node)
631 return;
632
633 tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len;
634
635 skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len);
636 if (!skb)
637 goto out;
638
639 skb->priority = TC_PRIO_CONTROL;
640 skb_reserve(skb, ETH_HLEN);
641 tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len);
642 unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff;
643 unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV;
644 unicast_tvlv_packet->version = BATADV_COMPAT_VERSION;
645 unicast_tvlv_packet->ttl = BATADV_TTL;
646 unicast_tvlv_packet->reserved = 0;
647 unicast_tvlv_packet->tvlv_len = htons(tvlv_len);
648 unicast_tvlv_packet->align = 0;
649 ether_addr_copy(unicast_tvlv_packet->src, src);
650 ether_addr_copy(unicast_tvlv_packet->dst, dst);
651
652 tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1);
653 tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff;
654 tvlv_hdr->version = version;
655 tvlv_hdr->type = type;
656 tvlv_hdr->len = htons(tvlv_value_len);
657 tvlv_buff += sizeof(*tvlv_hdr);
658 memcpy(tvlv_buff, tvlv_value, tvlv_value_len);
659
660 batadv_send_skb_to_orig(skb, orig_node, NULL);
661 out:
662 batadv_orig_node_put(orig_node);
663 }
664
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