1 /* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: 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, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include "main.h" 19 20 #include <linux/byteorder/generic.h> 21 #include <linux/etherdevice.h> 22 #include <linux/fs.h> 23 #include <linux/if_ether.h> 24 #include <linux/kernel.h> 25 #include <linux/kref.h> 26 #include <linux/list.h> 27 #include <linux/lockdep.h> 28 #include <linux/netdevice.h> 29 #include <linux/pkt_sched.h> 30 #include <linux/rculist.h> 31 #include <linux/rcupdate.h> 32 #include <linux/skbuff.h> 33 #include <linux/slab.h> 34 #include <linux/spinlock.h> 35 #include <linux/stddef.h> 36 #include <linux/string.h> 37 #include <linux/types.h> 38 39 #include "originator.h" 40 #include "packet.h" 41 #include "send.h" 42 #include "tvlv.h" 43 44 /** 45 * batadv_tvlv_handler_release - release tvlv handler from lists and queue for 46 * free after rcu grace period 47 * @ref: kref pointer of the tvlv 48 */ 49 static void batadv_tvlv_handler_release(struct kref *ref) 50 { 51 struct batadv_tvlv_handler *tvlv_handler; 52 53 tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount); 54 kfree_rcu(tvlv_handler, rcu); 55 } 56 57 /** 58 * batadv_tvlv_handler_put - decrement the tvlv container refcounter and 59 * possibly release it 60 * @tvlv_handler: the tvlv handler to free 61 */ 62 static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler) 63 { 64 kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release); 65 } 66 67 /** 68 * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list 69 * based on the provided type and version (both need to match) 70 * @bat_priv: the bat priv with all the soft interface information 71 * @type: tvlv handler type to look for 72 * @version: tvlv handler version to look for 73 * 74 * Return: tvlv handler if found or NULL otherwise. 75 */ 76 static struct batadv_tvlv_handler * 77 batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version) 78 { 79 struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL; 80 81 rcu_read_lock(); 82 hlist_for_each_entry_rcu(tvlv_handler_tmp, 83 &bat_priv->tvlv.handler_list, list) { 84 if (tvlv_handler_tmp->type != type) 85 continue; 86 87 if (tvlv_handler_tmp->version != version) 88 continue; 89 90 if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount)) 91 continue; 92 93 tvlv_handler = tvlv_handler_tmp; 94 break; 95 } 96 rcu_read_unlock(); 97 98 return tvlv_handler; 99 } 100 101 /** 102 * batadv_tvlv_container_release - release tvlv from lists and free 103 * @ref: kref pointer of the tvlv 104 */ 105 static void batadv_tvlv_container_release(struct kref *ref) 106 { 107 struct batadv_tvlv_container *tvlv; 108 109 tvlv = container_of(ref, struct batadv_tvlv_container, refcount); 110 kfree(tvlv); 111 } 112 113 /** 114 * batadv_tvlv_container_put - decrement the tvlv container refcounter and 115 * possibly release it 116 * @tvlv: the tvlv container to free 117 */ 118 static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv) 119 { 120 kref_put(&tvlv->refcount, batadv_tvlv_container_release); 121 } 122 123 /** 124 * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container 125 * list based on the provided type and version (both need to match) 126 * @bat_priv: the bat priv with all the soft interface information 127 * @type: tvlv container type to look for 128 * @version: tvlv container version to look for 129 * 130 * Has to be called with the appropriate locks being acquired 131 * (tvlv.container_list_lock). 132 * 133 * Return: tvlv container if found or NULL otherwise. 134 */ 135 static struct batadv_tvlv_container * 136 batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version) 137 { 138 struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; 139 140 lockdep_assert_held(&bat_priv->tvlv.container_list_lock); 141 142 hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { 143 if (tvlv_tmp->tvlv_hdr.type != type) 144 continue; 145 146 if (tvlv_tmp->tvlv_hdr.version != version) 147 continue; 148 149 kref_get(&tvlv_tmp->refcount); 150 tvlv = tvlv_tmp; 151 break; 152 } 153 154 return tvlv; 155 } 156 157 /** 158 * batadv_tvlv_container_list_size - calculate the size of the tvlv container 159 * list entries 160 * @bat_priv: the bat priv with all the soft interface information 161 * 162 * Has to be called with the appropriate locks being acquired 163 * (tvlv.container_list_lock). 164 * 165 * Return: size of all currently registered tvlv containers in bytes. 166 */ 167 static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) 168 { 169 struct batadv_tvlv_container *tvlv; 170 u16 tvlv_len = 0; 171 172 lockdep_assert_held(&bat_priv->tvlv.container_list_lock); 173 174 hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { 175 tvlv_len += sizeof(struct batadv_tvlv_hdr); 176 tvlv_len += ntohs(tvlv->tvlv_hdr.len); 177 } 178 179 return tvlv_len; 180 } 181 182 /** 183 * batadv_tvlv_container_remove - remove tvlv container from the tvlv container 184 * list 185 * @bat_priv: the bat priv with all the soft interface information 186 * @tvlv: the to be removed tvlv container 187 * 188 * Has to be called with the appropriate locks being acquired 189 * (tvlv.container_list_lock). 190 */ 191 static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv, 192 struct batadv_tvlv_container *tvlv) 193 { 194 lockdep_assert_held(&bat_priv->tvlv.container_list_lock); 195 196 if (!tvlv) 197 return; 198 199 hlist_del(&tvlv->list); 200 201 /* first call to decrement the counter, second call to free */ 202 batadv_tvlv_container_put(tvlv); 203 batadv_tvlv_container_put(tvlv); 204 } 205 206 /** 207 * batadv_tvlv_container_unregister - unregister tvlv container based on the 208 * provided type and version (both need to match) 209 * @bat_priv: the bat priv with all the soft interface information 210 * @type: tvlv container type to unregister 211 * @version: tvlv container type to unregister 212 */ 213 void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, 214 u8 type, u8 version) 215 { 216 struct batadv_tvlv_container *tvlv; 217 218 spin_lock_bh(&bat_priv->tvlv.container_list_lock); 219 tvlv = batadv_tvlv_container_get(bat_priv, type, version); 220 batadv_tvlv_container_remove(bat_priv, tvlv); 221 spin_unlock_bh(&bat_priv->tvlv.container_list_lock); 222 } 223 224 /** 225 * batadv_tvlv_container_register - register tvlv type, version and content 226 * to be propagated with each (primary interface) OGM 227 * @bat_priv: the bat priv with all the soft interface information 228 * @type: tvlv container type 229 * @version: tvlv container version 230 * @tvlv_value: tvlv container content 231 * @tvlv_value_len: tvlv container content length 232 * 233 * If a container of the same type and version was already registered the new 234 * content is going to replace the old one. 235 */ 236 void batadv_tvlv_container_register(struct batadv_priv *bat_priv, 237 u8 type, u8 version, 238 void *tvlv_value, u16 tvlv_value_len) 239 { 240 struct batadv_tvlv_container *tvlv_old, *tvlv_new; 241 242 if (!tvlv_value) 243 tvlv_value_len = 0; 244 245 tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC); 246 if (!tvlv_new) 247 return; 248 249 tvlv_new->tvlv_hdr.version = version; 250 tvlv_new->tvlv_hdr.type = type; 251 tvlv_new->tvlv_hdr.len = htons(tvlv_value_len); 252 253 memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); 254 INIT_HLIST_NODE(&tvlv_new->list); 255 kref_init(&tvlv_new->refcount); 256 257 spin_lock_bh(&bat_priv->tvlv.container_list_lock); 258 tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); 259 batadv_tvlv_container_remove(bat_priv, tvlv_old); 260 hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); 261 spin_unlock_bh(&bat_priv->tvlv.container_list_lock); 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 * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet 356 * @orig_node: orig node emitting the ogm packet 357 * @src: source mac address of the unicast packet 358 * @dst: destination mac address of the unicast packet 359 * @tvlv_value: tvlv content 360 * @tvlv_value_len: tvlv content length 361 * 362 * Return: success if handler was not found or the return value of the handler 363 * callback. 364 */ 365 static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, 366 struct batadv_tvlv_handler *tvlv_handler, 367 bool ogm_source, 368 struct batadv_orig_node *orig_node, 369 u8 *src, u8 *dst, 370 void *tvlv_value, u16 tvlv_value_len) 371 { 372 if (!tvlv_handler) 373 return NET_RX_SUCCESS; 374 375 if (ogm_source) { 376 if (!tvlv_handler->ogm_handler) 377 return NET_RX_SUCCESS; 378 379 if (!orig_node) 380 return NET_RX_SUCCESS; 381 382 tvlv_handler->ogm_handler(bat_priv, orig_node, 383 BATADV_NO_FLAGS, 384 tvlv_value, tvlv_value_len); 385 tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED; 386 } else { 387 if (!src) 388 return NET_RX_SUCCESS; 389 390 if (!dst) 391 return NET_RX_SUCCESS; 392 393 if (!tvlv_handler->unicast_handler) 394 return NET_RX_SUCCESS; 395 396 return tvlv_handler->unicast_handler(bat_priv, src, 397 dst, tvlv_value, 398 tvlv_value_len); 399 } 400 401 return NET_RX_SUCCESS; 402 } 403 404 /** 405 * batadv_tvlv_containers_process - parse the given tvlv buffer to call the 406 * appropriate handlers 407 * @bat_priv: the bat priv with all the soft interface information 408 * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet 409 * @orig_node: orig node emitting the ogm packet 410 * @src: source mac address of the unicast packet 411 * @dst: destination mac address of the unicast packet 412 * @tvlv_value: tvlv content 413 * @tvlv_value_len: tvlv content length 414 * 415 * Return: success when processing an OGM or the return value of all called 416 * handler callbacks. 417 */ 418 int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, 419 bool ogm_source, 420 struct batadv_orig_node *orig_node, 421 u8 *src, u8 *dst, 422 void *tvlv_value, u16 tvlv_value_len) 423 { 424 struct batadv_tvlv_handler *tvlv_handler; 425 struct batadv_tvlv_hdr *tvlv_hdr; 426 u16 tvlv_value_cont_len; 427 u8 cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND; 428 int ret = NET_RX_SUCCESS; 429 430 while (tvlv_value_len >= sizeof(*tvlv_hdr)) { 431 tvlv_hdr = tvlv_value; 432 tvlv_value_cont_len = ntohs(tvlv_hdr->len); 433 tvlv_value = tvlv_hdr + 1; 434 tvlv_value_len -= sizeof(*tvlv_hdr); 435 436 if (tvlv_value_cont_len > tvlv_value_len) 437 break; 438 439 tvlv_handler = batadv_tvlv_handler_get(bat_priv, 440 tvlv_hdr->type, 441 tvlv_hdr->version); 442 443 ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler, 444 ogm_source, orig_node, 445 src, dst, tvlv_value, 446 tvlv_value_cont_len); 447 if (tvlv_handler) 448 batadv_tvlv_handler_put(tvlv_handler); 449 tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len; 450 tvlv_value_len -= tvlv_value_cont_len; 451 } 452 453 if (!ogm_source) 454 return ret; 455 456 rcu_read_lock(); 457 hlist_for_each_entry_rcu(tvlv_handler, 458 &bat_priv->tvlv.handler_list, list) { 459 if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) && 460 !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED)) 461 tvlv_handler->ogm_handler(bat_priv, orig_node, 462 cifnotfound, NULL, 0); 463 464 tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED; 465 } 466 rcu_read_unlock(); 467 468 return NET_RX_SUCCESS; 469 } 470 471 /** 472 * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate 473 * handlers 474 * @bat_priv: the bat priv with all the soft interface information 475 * @batadv_ogm_packet: ogm packet containing the tvlv containers 476 * @orig_node: orig node emitting the ogm packet 477 */ 478 void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, 479 struct batadv_ogm_packet *batadv_ogm_packet, 480 struct batadv_orig_node *orig_node) 481 { 482 void *tvlv_value; 483 u16 tvlv_value_len; 484 485 if (!batadv_ogm_packet) 486 return; 487 488 tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len); 489 if (!tvlv_value_len) 490 return; 491 492 tvlv_value = batadv_ogm_packet + 1; 493 494 batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL, 495 tvlv_value, tvlv_value_len); 496 } 497 498 /** 499 * batadv_tvlv_handler_register - register tvlv handler based on the provided 500 * type and version (both need to match) for ogm tvlv payload and/or unicast 501 * payload 502 * @bat_priv: the bat priv with all the soft interface information 503 * @optr: ogm tvlv handler callback function. This function receives the orig 504 * node, flags and the tvlv content as argument to process. 505 * @uptr: unicast tvlv handler callback function. This function receives the 506 * source & destination of the unicast packet as well as the tvlv content 507 * to process. 508 * @type: tvlv handler type to be registered 509 * @version: tvlv handler version to be registered 510 * @flags: flags to enable or disable TVLV API behavior 511 */ 512 void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, 513 void (*optr)(struct batadv_priv *bat_priv, 514 struct batadv_orig_node *orig, 515 u8 flags, 516 void *tvlv_value, 517 u16 tvlv_value_len), 518 int (*uptr)(struct batadv_priv *bat_priv, 519 u8 *src, u8 *dst, 520 void *tvlv_value, 521 u16 tvlv_value_len), 522 u8 type, u8 version, u8 flags) 523 { 524 struct batadv_tvlv_handler *tvlv_handler; 525 526 tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); 527 if (tvlv_handler) { 528 batadv_tvlv_handler_put(tvlv_handler); 529 return; 530 } 531 532 tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC); 533 if (!tvlv_handler) 534 return; 535 536 tvlv_handler->ogm_handler = optr; 537 tvlv_handler->unicast_handler = uptr; 538 tvlv_handler->type = type; 539 tvlv_handler->version = version; 540 tvlv_handler->flags = flags; 541 kref_init(&tvlv_handler->refcount); 542 INIT_HLIST_NODE(&tvlv_handler->list); 543 544 spin_lock_bh(&bat_priv->tvlv.handler_list_lock); 545 hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list); 546 spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); 547 } 548 549 /** 550 * batadv_tvlv_handler_unregister - unregister tvlv handler based on the 551 * provided type and version (both need to match) 552 * @bat_priv: the bat priv with all the soft interface information 553 * @type: tvlv handler type to be unregistered 554 * @version: tvlv handler version to be unregistered 555 */ 556 void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, 557 u8 type, u8 version) 558 { 559 struct batadv_tvlv_handler *tvlv_handler; 560 561 tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); 562 if (!tvlv_handler) 563 return; 564 565 batadv_tvlv_handler_put(tvlv_handler); 566 spin_lock_bh(&bat_priv->tvlv.handler_list_lock); 567 hlist_del_rcu(&tvlv_handler->list); 568 spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); 569 batadv_tvlv_handler_put(tvlv_handler); 570 } 571 572 /** 573 * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the 574 * specified host 575 * @bat_priv: the bat priv with all the soft interface information 576 * @src: source mac address of the unicast packet 577 * @dst: destination mac address of the unicast packet 578 * @type: tvlv type 579 * @version: tvlv version 580 * @tvlv_value: tvlv content 581 * @tvlv_value_len: tvlv content length 582 */ 583 void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src, 584 u8 *dst, u8 type, u8 version, 585 void *tvlv_value, u16 tvlv_value_len) 586 { 587 struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; 588 struct batadv_tvlv_hdr *tvlv_hdr; 589 struct batadv_orig_node *orig_node; 590 struct sk_buff *skb; 591 unsigned char *tvlv_buff; 592 unsigned int tvlv_len; 593 ssize_t hdr_len = sizeof(*unicast_tvlv_packet); 594 int res; 595 596 orig_node = batadv_orig_hash_find(bat_priv, dst); 597 if (!orig_node) 598 return; 599 600 tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len; 601 602 skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len); 603 if (!skb) 604 goto out; 605 606 skb->priority = TC_PRIO_CONTROL; 607 skb_reserve(skb, ETH_HLEN); 608 tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len); 609 unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff; 610 unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV; 611 unicast_tvlv_packet->version = BATADV_COMPAT_VERSION; 612 unicast_tvlv_packet->ttl = BATADV_TTL; 613 unicast_tvlv_packet->reserved = 0; 614 unicast_tvlv_packet->tvlv_len = htons(tvlv_len); 615 unicast_tvlv_packet->align = 0; 616 ether_addr_copy(unicast_tvlv_packet->src, src); 617 ether_addr_copy(unicast_tvlv_packet->dst, dst); 618 619 tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1); 620 tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff; 621 tvlv_hdr->version = version; 622 tvlv_hdr->type = type; 623 tvlv_hdr->len = htons(tvlv_value_len); 624 tvlv_buff += sizeof(*tvlv_hdr); 625 memcpy(tvlv_buff, tvlv_value, tvlv_value_len); 626 627 res = batadv_send_skb_to_orig(skb, orig_node, NULL); 628 if (res == -1) 629 kfree_skb(skb); 630 out: 631 batadv_orig_node_put(orig_node); 632 } 633