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 "send.h" 19 #include "main.h" 20 21 #include <linux/atomic.h> 22 #include <linux/byteorder/generic.h> 23 #include <linux/errno.h> 24 #include <linux/etherdevice.h> 25 #include <linux/fs.h> 26 #include <linux/if.h> 27 #include <linux/if_ether.h> 28 #include <linux/jiffies.h> 29 #include <linux/kernel.h> 30 #include <linux/kref.h> 31 #include <linux/list.h> 32 #include <linux/netdevice.h> 33 #include <linux/printk.h> 34 #include <linux/rculist.h> 35 #include <linux/rcupdate.h> 36 #include <linux/skbuff.h> 37 #include <linux/slab.h> 38 #include <linux/spinlock.h> 39 #include <linux/stddef.h> 40 #include <linux/workqueue.h> 41 42 #include "distributed-arp-table.h" 43 #include "fragmentation.h" 44 #include "gateway_client.h" 45 #include "hard-interface.h" 46 #include "log.h" 47 #include "network-coding.h" 48 #include "originator.h" 49 #include "routing.h" 50 #include "soft-interface.h" 51 #include "translation-table.h" 52 53 static void batadv_send_outstanding_bcast_packet(struct work_struct *work); 54 55 /** 56 * batadv_send_skb_packet - send an already prepared packet 57 * @skb: the packet to send 58 * @hard_iface: the interface to use to send the broadcast packet 59 * @dst_addr: the payload destination 60 * 61 * Send out an already prepared packet to the given neighbor or broadcast it 62 * using the specified interface. Either hard_iface or neigh_node must be not 63 * NULL. 64 * If neigh_node is NULL, then the packet is broadcasted using hard_iface, 65 * otherwise it is sent as unicast to the given neighbor. 66 * 67 * Return: NET_TX_DROP in case of error or the result of dev_queue_xmit(skb) 68 * otherwise 69 */ 70 int batadv_send_skb_packet(struct sk_buff *skb, 71 struct batadv_hard_iface *hard_iface, 72 const u8 *dst_addr) 73 { 74 struct batadv_priv *bat_priv; 75 struct ethhdr *ethhdr; 76 int ret; 77 78 bat_priv = netdev_priv(hard_iface->soft_iface); 79 80 if (hard_iface->if_status != BATADV_IF_ACTIVE) 81 goto send_skb_err; 82 83 if (unlikely(!hard_iface->net_dev)) 84 goto send_skb_err; 85 86 if (!(hard_iface->net_dev->flags & IFF_UP)) { 87 pr_warn("Interface %s is not up - can't send packet via that interface!\n", 88 hard_iface->net_dev->name); 89 goto send_skb_err; 90 } 91 92 /* push to the ethernet header. */ 93 if (batadv_skb_head_push(skb, ETH_HLEN) < 0) 94 goto send_skb_err; 95 96 skb_reset_mac_header(skb); 97 98 ethhdr = eth_hdr(skb); 99 ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr); 100 ether_addr_copy(ethhdr->h_dest, dst_addr); 101 ethhdr->h_proto = htons(ETH_P_BATMAN); 102 103 skb_set_network_header(skb, ETH_HLEN); 104 skb->protocol = htons(ETH_P_BATMAN); 105 106 skb->dev = hard_iface->net_dev; 107 108 /* Save a clone of the skb to use when decoding coded packets */ 109 batadv_nc_skb_store_for_decoding(bat_priv, skb); 110 111 /* dev_queue_xmit() returns a negative result on error. However on 112 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP 113 * (which is > 0). This will not be treated as an error. 114 * 115 * a negative value cannot be returned because it could be interepreted 116 * as not consumed skb by callers of batadv_send_skb_to_orig. 117 */ 118 ret = dev_queue_xmit(skb); 119 if (ret < 0) 120 ret = NET_XMIT_DROP; 121 122 return ret; 123 send_skb_err: 124 kfree_skb(skb); 125 return NET_XMIT_DROP; 126 } 127 128 int batadv_send_broadcast_skb(struct sk_buff *skb, 129 struct batadv_hard_iface *hard_iface) 130 { 131 return batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); 132 } 133 134 int batadv_send_unicast_skb(struct sk_buff *skb, 135 struct batadv_neigh_node *neigh) 136 { 137 #ifdef CONFIG_BATMAN_ADV_BATMAN_V 138 struct batadv_hardif_neigh_node *hardif_neigh; 139 #endif 140 int ret; 141 142 ret = batadv_send_skb_packet(skb, neigh->if_incoming, neigh->addr); 143 144 #ifdef CONFIG_BATMAN_ADV_BATMAN_V 145 hardif_neigh = batadv_hardif_neigh_get(neigh->if_incoming, neigh->addr); 146 147 if ((hardif_neigh) && (ret != NET_XMIT_DROP)) 148 hardif_neigh->bat_v.last_unicast_tx = jiffies; 149 150 if (hardif_neigh) 151 batadv_hardif_neigh_put(hardif_neigh); 152 #endif 153 154 return ret; 155 } 156 157 /** 158 * batadv_send_skb_to_orig - Lookup next-hop and transmit skb. 159 * @skb: Packet to be transmitted. 160 * @orig_node: Final destination of the packet. 161 * @recv_if: Interface used when receiving the packet (can be NULL). 162 * 163 * Looks up the best next-hop towards the passed originator and passes the 164 * skb on for preparation of MAC header. If the packet originated from this 165 * host, NULL can be passed as recv_if and no interface alternating is 166 * attempted. 167 * 168 * Return: -1 on failure (and the skb is not consumed), -EINPROGRESS if the 169 * skb is buffered for later transmit or the NET_XMIT status returned by the 170 * lower routine if the packet has been passed down. 171 * 172 * If the returning value is not -1 the skb has been consumed. 173 */ 174 int batadv_send_skb_to_orig(struct sk_buff *skb, 175 struct batadv_orig_node *orig_node, 176 struct batadv_hard_iface *recv_if) 177 { 178 struct batadv_priv *bat_priv = orig_node->bat_priv; 179 struct batadv_neigh_node *neigh_node; 180 int ret = -1; 181 182 /* batadv_find_router() increases neigh_nodes refcount if found. */ 183 neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); 184 if (!neigh_node) 185 goto out; 186 187 /* Check if the skb is too large to send in one piece and fragment 188 * it if needed. 189 */ 190 if (atomic_read(&bat_priv->fragmentation) && 191 skb->len > neigh_node->if_incoming->net_dev->mtu) { 192 /* Fragment and send packet. */ 193 ret = batadv_frag_send_packet(skb, orig_node, neigh_node); 194 195 goto out; 196 } 197 198 /* try to network code the packet, if it is received on an interface 199 * (i.e. being forwarded). If the packet originates from this node or if 200 * network coding fails, then send the packet as usual. 201 */ 202 if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) 203 ret = -EINPROGRESS; 204 else 205 ret = batadv_send_unicast_skb(skb, neigh_node); 206 207 out: 208 if (neigh_node) 209 batadv_neigh_node_put(neigh_node); 210 211 return ret; 212 } 213 214 /** 215 * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the 216 * common fields for unicast packets 217 * @skb: the skb carrying the unicast header to initialize 218 * @hdr_size: amount of bytes to push at the beginning of the skb 219 * @orig_node: the destination node 220 * 221 * Return: false if the buffer extension was not possible or true otherwise. 222 */ 223 static bool 224 batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size, 225 struct batadv_orig_node *orig_node) 226 { 227 struct batadv_unicast_packet *unicast_packet; 228 u8 ttvn = (u8)atomic_read(&orig_node->last_ttvn); 229 230 if (batadv_skb_head_push(skb, hdr_size) < 0) 231 return false; 232 233 unicast_packet = (struct batadv_unicast_packet *)skb->data; 234 unicast_packet->version = BATADV_COMPAT_VERSION; 235 /* batman packet type: unicast */ 236 unicast_packet->packet_type = BATADV_UNICAST; 237 /* set unicast ttl */ 238 unicast_packet->ttl = BATADV_TTL; 239 /* copy the destination for faster routing */ 240 ether_addr_copy(unicast_packet->dest, orig_node->orig); 241 /* set the destination tt version number */ 242 unicast_packet->ttvn = ttvn; 243 244 return true; 245 } 246 247 /** 248 * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header 249 * @skb: the skb containing the payload to encapsulate 250 * @orig_node: the destination node 251 * 252 * Return: false if the payload could not be encapsulated or true otherwise. 253 */ 254 static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb, 255 struct batadv_orig_node *orig_node) 256 { 257 size_t uni_size = sizeof(struct batadv_unicast_packet); 258 259 return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node); 260 } 261 262 /** 263 * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a 264 * unicast 4addr header 265 * @bat_priv: the bat priv with all the soft interface information 266 * @skb: the skb containing the payload to encapsulate 267 * @orig: the destination node 268 * @packet_subtype: the unicast 4addr packet subtype to use 269 * 270 * Return: false if the payload could not be encapsulated or true otherwise. 271 */ 272 bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv, 273 struct sk_buff *skb, 274 struct batadv_orig_node *orig, 275 int packet_subtype) 276 { 277 struct batadv_hard_iface *primary_if; 278 struct batadv_unicast_4addr_packet *uc_4addr_packet; 279 bool ret = false; 280 281 primary_if = batadv_primary_if_get_selected(bat_priv); 282 if (!primary_if) 283 goto out; 284 285 /* Pull the header space and fill the unicast_packet substructure. 286 * We can do that because the first member of the uc_4addr_packet 287 * is of type struct unicast_packet 288 */ 289 if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet), 290 orig)) 291 goto out; 292 293 uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; 294 uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR; 295 ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr); 296 uc_4addr_packet->subtype = packet_subtype; 297 uc_4addr_packet->reserved = 0; 298 299 ret = true; 300 out: 301 if (primary_if) 302 batadv_hardif_put(primary_if); 303 return ret; 304 } 305 306 /** 307 * batadv_send_skb_unicast - encapsulate and send an skb via unicast 308 * @bat_priv: the bat priv with all the soft interface information 309 * @skb: payload to send 310 * @packet_type: the batman unicast packet type to use 311 * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast 312 * 4addr packets) 313 * @orig_node: the originator to send the packet to 314 * @vid: the vid to be used to search the translation table 315 * 316 * Wrap the given skb into a batman-adv unicast or unicast-4addr header 317 * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied 318 * as packet_type. Then send this frame to the given orig_node and release a 319 * reference to this orig_node. 320 * 321 * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. 322 */ 323 int batadv_send_skb_unicast(struct batadv_priv *bat_priv, 324 struct sk_buff *skb, int packet_type, 325 int packet_subtype, 326 struct batadv_orig_node *orig_node, 327 unsigned short vid) 328 { 329 struct batadv_unicast_packet *unicast_packet; 330 struct ethhdr *ethhdr; 331 int res, ret = NET_XMIT_DROP; 332 333 if (!orig_node) 334 goto out; 335 336 switch (packet_type) { 337 case BATADV_UNICAST: 338 if (!batadv_send_skb_prepare_unicast(skb, orig_node)) 339 goto out; 340 break; 341 case BATADV_UNICAST_4ADDR: 342 if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb, 343 orig_node, 344 packet_subtype)) 345 goto out; 346 break; 347 default: 348 /* this function supports UNICAST and UNICAST_4ADDR only. It 349 * should never be invoked with any other packet type 350 */ 351 goto out; 352 } 353 354 /* skb->data might have been reallocated by 355 * batadv_send_skb_prepare_unicast{,_4addr}() 356 */ 357 ethhdr = eth_hdr(skb); 358 unicast_packet = (struct batadv_unicast_packet *)skb->data; 359 360 /* inform the destination node that we are still missing a correct route 361 * for this client. The destination will receive this packet and will 362 * try to reroute it because the ttvn contained in the header is less 363 * than the current one 364 */ 365 if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) 366 unicast_packet->ttvn = unicast_packet->ttvn - 1; 367 368 res = batadv_send_skb_to_orig(skb, orig_node, NULL); 369 if (res != -1) 370 ret = NET_XMIT_SUCCESS; 371 372 out: 373 if (orig_node) 374 batadv_orig_node_put(orig_node); 375 if (ret == NET_XMIT_DROP) 376 kfree_skb(skb); 377 return ret; 378 } 379 380 /** 381 * batadv_send_skb_via_tt_generic - send an skb via TT lookup 382 * @bat_priv: the bat priv with all the soft interface information 383 * @skb: payload to send 384 * @packet_type: the batman unicast packet type to use 385 * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast 386 * 4addr packets) 387 * @dst_hint: can be used to override the destination contained in the skb 388 * @vid: the vid to be used to search the translation table 389 * 390 * Look up the recipient node for the destination address in the ethernet 391 * header via the translation table. Wrap the given skb into a batman-adv 392 * unicast or unicast-4addr header depending on whether BATADV_UNICAST or 393 * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame 394 * to the according destination node. 395 * 396 * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. 397 */ 398 int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv, 399 struct sk_buff *skb, int packet_type, 400 int packet_subtype, u8 *dst_hint, 401 unsigned short vid) 402 { 403 struct ethhdr *ethhdr = (struct ethhdr *)skb->data; 404 struct batadv_orig_node *orig_node; 405 u8 *src, *dst; 406 407 src = ethhdr->h_source; 408 dst = ethhdr->h_dest; 409 410 /* if we got an hint! let's send the packet to this client (if any) */ 411 if (dst_hint) { 412 src = NULL; 413 dst = dst_hint; 414 } 415 orig_node = batadv_transtable_search(bat_priv, src, dst, vid); 416 417 return batadv_send_skb_unicast(bat_priv, skb, packet_type, 418 packet_subtype, orig_node, vid); 419 } 420 421 /** 422 * batadv_send_skb_via_gw - send an skb via gateway lookup 423 * @bat_priv: the bat priv with all the soft interface information 424 * @skb: payload to send 425 * @vid: the vid to be used to search the translation table 426 * 427 * Look up the currently selected gateway. Wrap the given skb into a batman-adv 428 * unicast header and send this frame to this gateway node. 429 * 430 * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. 431 */ 432 int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb, 433 unsigned short vid) 434 { 435 struct batadv_orig_node *orig_node; 436 437 orig_node = batadv_gw_get_selected_orig(bat_priv); 438 return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST_4ADDR, 439 BATADV_P_DATA, orig_node, vid); 440 } 441 442 void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet) 443 { 444 kfree_skb(forw_packet->skb); 445 if (forw_packet->if_incoming) 446 batadv_hardif_put(forw_packet->if_incoming); 447 if (forw_packet->if_outgoing) 448 batadv_hardif_put(forw_packet->if_outgoing); 449 kfree(forw_packet); 450 } 451 452 static void 453 _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, 454 struct batadv_forw_packet *forw_packet, 455 unsigned long send_time) 456 { 457 /* add new packet to packet list */ 458 spin_lock_bh(&bat_priv->forw_bcast_list_lock); 459 hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); 460 spin_unlock_bh(&bat_priv->forw_bcast_list_lock); 461 462 /* start timer for this packet */ 463 queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work, 464 send_time); 465 } 466 467 /** 468 * batadv_add_bcast_packet_to_list - queue broadcast packet for multiple sends 469 * @bat_priv: the bat priv with all the soft interface information 470 * @skb: broadcast packet to add 471 * @delay: number of jiffies to wait before sending 472 * 473 * add a broadcast packet to the queue and setup timers. broadcast packets 474 * are sent multiple times to increase probability for being received. 475 * 476 * The skb is not consumed, so the caller should make sure that the 477 * skb is freed. 478 * 479 * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors. 480 */ 481 int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, 482 const struct sk_buff *skb, 483 unsigned long delay) 484 { 485 struct batadv_hard_iface *primary_if = NULL; 486 struct batadv_forw_packet *forw_packet; 487 struct batadv_bcast_packet *bcast_packet; 488 struct sk_buff *newskb; 489 490 if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { 491 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 492 "bcast packet queue full\n"); 493 goto out; 494 } 495 496 primary_if = batadv_primary_if_get_selected(bat_priv); 497 if (!primary_if) 498 goto out_and_inc; 499 500 forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC); 501 502 if (!forw_packet) 503 goto out_and_inc; 504 505 newskb = skb_copy(skb, GFP_ATOMIC); 506 if (!newskb) 507 goto packet_free; 508 509 /* as we have a copy now, it is safe to decrease the TTL */ 510 bcast_packet = (struct batadv_bcast_packet *)newskb->data; 511 bcast_packet->ttl--; 512 513 skb_reset_mac_header(newskb); 514 515 forw_packet->skb = newskb; 516 forw_packet->if_incoming = primary_if; 517 forw_packet->if_outgoing = NULL; 518 519 /* how often did we send the bcast packet ? */ 520 forw_packet->num_packets = 0; 521 522 INIT_DELAYED_WORK(&forw_packet->delayed_work, 523 batadv_send_outstanding_bcast_packet); 524 525 _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay); 526 return NETDEV_TX_OK; 527 528 packet_free: 529 kfree(forw_packet); 530 out_and_inc: 531 atomic_inc(&bat_priv->bcast_queue_left); 532 out: 533 if (primary_if) 534 batadv_hardif_put(primary_if); 535 return NETDEV_TX_BUSY; 536 } 537 538 static void batadv_send_outstanding_bcast_packet(struct work_struct *work) 539 { 540 struct batadv_hard_iface *hard_iface; 541 struct delayed_work *delayed_work; 542 struct batadv_forw_packet *forw_packet; 543 struct sk_buff *skb1; 544 struct net_device *soft_iface; 545 struct batadv_priv *bat_priv; 546 547 delayed_work = to_delayed_work(work); 548 forw_packet = container_of(delayed_work, struct batadv_forw_packet, 549 delayed_work); 550 soft_iface = forw_packet->if_incoming->soft_iface; 551 bat_priv = netdev_priv(soft_iface); 552 553 spin_lock_bh(&bat_priv->forw_bcast_list_lock); 554 hlist_del(&forw_packet->list); 555 spin_unlock_bh(&bat_priv->forw_bcast_list_lock); 556 557 if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) 558 goto out; 559 560 if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) 561 goto out; 562 563 /* rebroadcast packet */ 564 rcu_read_lock(); 565 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 566 if (hard_iface->soft_iface != soft_iface) 567 continue; 568 569 if (forw_packet->num_packets >= hard_iface->num_bcasts) 570 continue; 571 572 if (!kref_get_unless_zero(&hard_iface->refcount)) 573 continue; 574 575 /* send a copy of the saved skb */ 576 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); 577 if (skb1) 578 batadv_send_broadcast_skb(skb1, hard_iface); 579 580 batadv_hardif_put(hard_iface); 581 } 582 rcu_read_unlock(); 583 584 forw_packet->num_packets++; 585 586 /* if we still have some more bcasts to send */ 587 if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) { 588 _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, 589 msecs_to_jiffies(5)); 590 return; 591 } 592 593 out: 594 batadv_forw_packet_free(forw_packet); 595 atomic_inc(&bat_priv->bcast_queue_left); 596 } 597 598 void 599 batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, 600 const struct batadv_hard_iface *hard_iface) 601 { 602 struct batadv_forw_packet *forw_packet; 603 struct hlist_node *safe_tmp_node; 604 bool pending; 605 606 if (hard_iface) 607 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 608 "purge_outstanding_packets(): %s\n", 609 hard_iface->net_dev->name); 610 else 611 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 612 "purge_outstanding_packets()\n"); 613 614 /* free bcast list */ 615 spin_lock_bh(&bat_priv->forw_bcast_list_lock); 616 hlist_for_each_entry_safe(forw_packet, safe_tmp_node, 617 &bat_priv->forw_bcast_list, list) { 618 /* if purge_outstanding_packets() was called with an argument 619 * we delete only packets belonging to the given interface 620 */ 621 if ((hard_iface) && 622 (forw_packet->if_incoming != hard_iface) && 623 (forw_packet->if_outgoing != hard_iface)) 624 continue; 625 626 spin_unlock_bh(&bat_priv->forw_bcast_list_lock); 627 628 /* batadv_send_outstanding_bcast_packet() will lock the list to 629 * delete the item from the list 630 */ 631 pending = cancel_delayed_work_sync(&forw_packet->delayed_work); 632 spin_lock_bh(&bat_priv->forw_bcast_list_lock); 633 634 if (pending) { 635 hlist_del(&forw_packet->list); 636 if (!forw_packet->own) 637 atomic_inc(&bat_priv->bcast_queue_left); 638 639 batadv_forw_packet_free(forw_packet); 640 } 641 } 642 spin_unlock_bh(&bat_priv->forw_bcast_list_lock); 643 644 /* free batman packet list */ 645 spin_lock_bh(&bat_priv->forw_bat_list_lock); 646 hlist_for_each_entry_safe(forw_packet, safe_tmp_node, 647 &bat_priv->forw_bat_list, list) { 648 /* if purge_outstanding_packets() was called with an argument 649 * we delete only packets belonging to the given interface 650 */ 651 if ((hard_iface) && 652 (forw_packet->if_incoming != hard_iface) && 653 (forw_packet->if_outgoing != hard_iface)) 654 continue; 655 656 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 657 658 /* send_outstanding_bat_packet() will lock the list to 659 * delete the item from the list 660 */ 661 pending = cancel_delayed_work_sync(&forw_packet->delayed_work); 662 spin_lock_bh(&bat_priv->forw_bat_list_lock); 663 664 if (pending) { 665 hlist_del(&forw_packet->list); 666 if (!forw_packet->own) 667 atomic_inc(&bat_priv->batman_queue_left); 668 669 batadv_forw_packet_free(forw_packet); 670 } 671 } 672 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 673 } 674