net/batman-adv/send.c

   1 /* Copyright (C) 2007-2013 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 #include "distributed-arp-table.h"
  20 #include "send.h"
  21 #include "routing.h"
  22 #include "translation-table.h"
  23 #include "soft-interface.h"
  24 #include "hard-interface.h"
  25 #include "gateway_common.h"
  26 #include "gateway_client.h"
  27 #include "originator.h"
  28 #include "network-coding.h"
  29 #include "fragmentation.h"
  30
  31 static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
  32
  33 /* send out an already prepared packet to the given address via the
  34  * specified batman interface
  35  */
  36 int batadv_send_skb_packet(struct sk_buff *skb,
  37                            struct batadv_hard_iface *hard_iface,
  38                            const uint8_t *dst_addr)
  39 {
  40         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
  41         struct ethhdr *ethhdr;
  42
  43         if (hard_iface->if_status != BATADV_IF_ACTIVE)
  44                 goto send_skb_err;
  45
  46         if (unlikely(!hard_iface->net_dev))
  47                 goto send_skb_err;
  48
  49         if (!(hard_iface->net_dev->flags & IFF_UP)) {
  50                 pr_warn("Interface %s is not up - can't send packet via that interface!\n",
  51                         hard_iface->net_dev->name);
  52                 goto send_skb_err;
  53         }
  54
  55         /* push to the ethernet header. */
  56         if (batadv_skb_head_push(skb, ETH_HLEN) < 0)
  57                 goto send_skb_err;
  58
  59         skb_reset_mac_header(skb);
  60
  61         ethhdr = eth_hdr(skb);
  62         memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
  63         memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
  64         ethhdr->h_proto = htons(ETH_P_BATMAN);
  65
  66         skb_set_network_header(skb, ETH_HLEN);
  67         skb->protocol = htons(ETH_P_BATMAN);
  68
  69         skb->dev = hard_iface->net_dev;
  70
  71         /* Save a clone of the skb to use when decoding coded packets */
  72         batadv_nc_skb_store_for_decoding(bat_priv, skb);
  73
  74         /* dev_queue_xmit() returns a negative result on error.  However on
  75          * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
  76          * (which is > 0). This will not be treated as an error.
  77          */
  78         return dev_queue_xmit(skb);
  79 send_skb_err:
  80         kfree_skb(skb);
  81         return NET_XMIT_DROP;
  82 }
  83
  84 /**
  85  * batadv_send_skb_to_orig - Lookup next-hop and transmit skb.
  86  * @skb: Packet to be transmitted.
  87  * @orig_node: Final destination of the packet.
  88  * @recv_if: Interface used when receiving the packet (can be NULL).
  89  *
  90  * Looks up the best next-hop towards the passed originator and passes the
  91  * skb on for preparation of MAC header. If the packet originated from this
  92  * host, NULL can be passed as recv_if and no interface alternating is
  93  * attempted.
  94  *
  95  * Returns NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or
  96  * NET_XMIT_POLICED if the skb is buffered for later transmit.
  97  */
  98 int batadv_send_skb_to_orig(struct sk_buff *skb,
  99                             struct batadv_orig_node *orig_node,
 100                             struct batadv_hard_iface *recv_if)
 101 {
 102         struct batadv_priv *bat_priv = orig_node->bat_priv;
 103         struct batadv_neigh_node *neigh_node;
 104         int ret = NET_XMIT_DROP;
 105
 106         /* batadv_find_router() increases neigh_nodes refcount if found. */
 107         neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
 108         if (!neigh_node)
 109                 goto out;
 110
 111         /* Check if the skb is too large to send in one piece and fragment
 112          * it if needed.
 113          */
 114         if (atomic_read(&bat_priv->fragmentation) &&
 115             skb->len > neigh_node->if_incoming->net_dev->mtu) {
 116                 /* Fragment and send packet. */
 117                 if (batadv_frag_send_packet(skb, orig_node, neigh_node))
 118                         ret = NET_XMIT_SUCCESS;
 119
 120                 goto out;
 121         }
 122
 123         /* try to network code the packet, if it is received on an interface
 124          * (i.e. being forwarded). If the packet originates from this node or if
 125          * network coding fails, then send the packet as usual.
 126          */
 127         if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) {
 128                 ret = NET_XMIT_POLICED;
 129         } else {
 130                 batadv_send_skb_packet(skb, neigh_node->if_incoming,
 131                                        neigh_node->addr);
 132                 ret = NET_XMIT_SUCCESS;
 133         }
 134
 135 out:
 136         if (neigh_node)
 137                 batadv_neigh_node_free_ref(neigh_node);
 138
 139         return ret;
 140 }
 141
 142 /**
 143  * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the
 144  *  common fields for unicast packets
 145  * @skb: the skb carrying the unicast header to initialize
 146  * @hdr_size: amount of bytes to push at the beginning of the skb
 147  * @orig_node: the destination node
 148  *
 149  * Returns false if the buffer extension was not possible or true otherwise.
 150  */
 151 static bool
 152 batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
 153                                   struct batadv_orig_node *orig_node)
 154 {
 155         struct batadv_unicast_packet *unicast_packet;
 156         uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
 157
 158         if (batadv_skb_head_push(skb, hdr_size) < 0)
 159                 return false;
 160
 161         unicast_packet = (struct batadv_unicast_packet *)skb->data;
 162         unicast_packet->version = BATADV_COMPAT_VERSION;
 163         /* batman packet type: unicast */
 164         unicast_packet->packet_type = BATADV_UNICAST;
 165         /* set unicast ttl */
 166         unicast_packet->ttl = BATADV_TTL;
 167         /* copy the destination for faster routing */
 168         memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
 169         /* set the destination tt version number */
 170         unicast_packet->ttvn = ttvn;
 171
 172         return true;
 173 }
 174
 175 /**
 176  * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header
 177  * @skb: the skb containing the payload to encapsulate
 178  * @orig_node: the destination node
 179  *
 180  * Returns false if the payload could not be encapsulated or true otherwise.
 181  */
 182 static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb,
 183                                             struct batadv_orig_node *orig_node)
 184 {
 185         size_t uni_size = sizeof(struct batadv_unicast_packet);
 186
 187         return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node);
 188 }
 189
 190 /**
 191  * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a
 192  *  unicast 4addr header
 193  * @bat_priv: the bat priv with all the soft interface information
 194  * @skb: the skb containing the payload to encapsulate
 195  * @orig_node: the destination node
 196  * @packet_subtype: the unicast 4addr packet subtype to use
 197  *
 198  * Returns false if the payload could not be encapsulated or true otherwise.
 199  */
 200 bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
 201                                            struct sk_buff *skb,
 202                                            struct batadv_orig_node *orig,
 203                                            int packet_subtype)
 204 {
 205         struct batadv_hard_iface *primary_if;
 206         struct batadv_unicast_4addr_packet *uc_4addr_packet;
 207         bool ret = false;
 208
 209         primary_if = batadv_primary_if_get_selected(bat_priv);
 210         if (!primary_if)
 211                 goto out;
 212
 213         /* Pull the header space and fill the unicast_packet substructure.
 214          * We can do that because the first member of the uc_4addr_packet
 215          * is of type struct unicast_packet
 216          */
 217         if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet),
 218                                                orig))
 219                 goto out;
 220
 221         uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
 222         uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR;
 223         memcpy(uc_4addr_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
 224         uc_4addr_packet->subtype = packet_subtype;
 225         uc_4addr_packet->reserved = 0;
 226
 227         ret = true;
 228 out:
 229         if (primary_if)
 230                 batadv_hardif_free_ref(primary_if);
 231         return ret;
 232 }
 233
 234 /**
 235  * batadv_send_skb_unicast - encapsulate and send an skb via unicast
 236  * @bat_priv: the bat priv with all the soft interface information
 237  * @skb: payload to send
 238  * @packet_type: the batman unicast packet type to use
 239  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
 240  *  4addr packets)
 241  * @orig_node: the originator to send the packet to
 242  * @vid: the vid to be used to search the translation table
 243  *
 244  * Wrap the given skb into a batman-adv unicast or unicast-4addr header
 245  * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied
 246  * as packet_type. Then send this frame to the given orig_node and release a
 247  * reference to this orig_node.
 248  *
 249  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
 250  */
 251 static int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
 252                                    struct sk_buff *skb, int packet_type,
 253                                    int packet_subtype,
 254                                    struct batadv_orig_node *orig_node,
 255                                    unsigned short vid)
 256 {
 257         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 258         struct batadv_unicast_packet *unicast_packet;
 259         int ret = NET_XMIT_DROP;
 260
 261         if (!orig_node)
 262                 goto out;
 263
 264         switch (packet_type) {
 265         case BATADV_UNICAST:
 266                 if (!batadv_send_skb_prepare_unicast(skb, orig_node))
 267                         goto out;
 268                 break;
 269         case BATADV_UNICAST_4ADDR:
 270                 if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb,
 271                                                            orig_node,
 272                                                            packet_subtype))
 273                         goto out;
 274                 break;
 275         default:
 276                 /* this function supports UNICAST and UNICAST_4ADDR only. It
 277                  * should never be invoked with any other packet type
 278                  */
 279                 goto out;
 280         }
 281
 282         unicast_packet = (struct batadv_unicast_packet *)skb->data;
 283
 284         /* inform the destination node that we are still missing a correct route
 285          * for this client. The destination will receive this packet and will
 286          * try to reroute it because the ttvn contained in the header is less
 287          * than the current one
 288          */
 289         if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid))
 290                 unicast_packet->ttvn = unicast_packet->ttvn - 1;
 291
 292         if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
 293                 ret = NET_XMIT_SUCCESS;
 294
 295 out:
 296         if (orig_node)
 297                 batadv_orig_node_free_ref(orig_node);
 298         if (ret == NET_XMIT_DROP)
 299                 kfree_skb(skb);
 300         return ret;
 301 }
 302
 303 /**
 304  * batadv_send_skb_via_tt_generic - send an skb via TT lookup
 305  * @bat_priv: the bat priv with all the soft interface information
 306  * @skb: payload to send
 307  * @packet_type: the batman unicast packet type to use
 308  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
 309  *  4addr packets)
 310  * @vid: the vid to be used to search the translation table
 311  *
 312  * Look up the recipient node for the destination address in the ethernet
 313  * header via the translation table. Wrap the given skb into a batman-adv
 314  * unicast or unicast-4addr header depending on whether BATADV_UNICAST or
 315  * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame
 316  * to the according destination node.
 317  *
 318  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
 319  */
 320 int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
 321                                    struct sk_buff *skb, int packet_type,
 322                                    int packet_subtype, unsigned short vid)
 323 {
 324         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 325         struct batadv_orig_node *orig_node;
 326
 327         orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
 328                                              ethhdr->h_dest, vid);
 329         return batadv_send_skb_unicast(bat_priv, skb, packet_type,
 330                                        packet_subtype, orig_node, vid);
 331 }
 332
 333 /**
 334  * batadv_send_skb_via_gw - send an skb via gateway lookup
 335  * @bat_priv: the bat priv with all the soft interface information
 336  * @skb: payload to send
 337  * @vid: the vid to be used to search the translation table
 338  *
 339  * Look up the currently selected gateway. Wrap the given skb into a batman-adv
 340  * unicast header and send this frame to this gateway node.
 341  *
 342  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
 343  */
 344 int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
 345                            unsigned short vid)
 346 {
 347         struct batadv_orig_node *orig_node;
 348
 349         orig_node = batadv_gw_get_selected_orig(bat_priv);
 350         return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0,
 351                                        orig_node, vid);
 352 }
 353
 354 void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
 355 {
 356         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 357
 358         if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) ||
 359             (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
 360                 return;
 361
 362         /* the interface gets activated here to avoid race conditions between
 363          * the moment of activating the interface in
 364          * hardif_activate_interface() where the originator mac is set and
 365          * outdated packets (especially uninitialized mac addresses) in the
 366          * packet queue
 367          */
 368         if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
 369                 hard_iface->if_status = BATADV_IF_ACTIVE;
 370
 371         bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface);
 372 }
 373
 374 static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
 375 {
 376         if (forw_packet->skb)
 377                 kfree_skb(forw_packet->skb);
 378         if (forw_packet->if_incoming)
 379                 batadv_hardif_free_ref(forw_packet->if_incoming);
 380         kfree(forw_packet);
 381 }
 382
 383 static void
 384 _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
 385                                  struct batadv_forw_packet *forw_packet,
 386                                  unsigned long send_time)
 387 {
 388         /* add new packet to packet list */
 389         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 390         hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
 391         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 392
 393         /* start timer for this packet */
 394         queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work,
 395                            send_time);
 396 }
 397
 398 /* add a broadcast packet to the queue and setup timers. broadcast packets
 399  * are sent multiple times to increase probability for being received.
 400  *
 401  * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
 402  * errors.
 403  *
 404  * The skb is not consumed, so the caller should make sure that the
 405  * skb is freed.
 406  */
 407 int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
 408                                     const struct sk_buff *skb,
 409                                     unsigned long delay)
 410 {
 411         struct batadv_hard_iface *primary_if = NULL;
 412         struct batadv_forw_packet *forw_packet;
 413         struct batadv_bcast_packet *bcast_packet;
 414         struct sk_buff *newskb;
 415
 416         if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
 417                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 418                            "bcast packet queue full\n");
 419                 goto out;
 420         }
 421
 422         primary_if = batadv_primary_if_get_selected(bat_priv);
 423         if (!primary_if)
 424                 goto out_and_inc;
 425
 426         forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
 427
 428         if (!forw_packet)
 429                 goto out_and_inc;
 430
 431         newskb = skb_copy(skb, GFP_ATOMIC);
 432         if (!newskb)
 433                 goto packet_free;
 434
 435         /* as we have a copy now, it is safe to decrease the TTL */
 436         bcast_packet = (struct batadv_bcast_packet *)newskb->data;
 437         bcast_packet->ttl--;
 438
 439         skb_reset_mac_header(newskb);
 440
 441         forw_packet->skb = newskb;
 442         forw_packet->if_incoming = primary_if;
 443
 444         /* how often did we send the bcast packet ? */
 445         forw_packet->num_packets = 0;
 446
 447         INIT_DELAYED_WORK(&forw_packet->delayed_work,
 448                           batadv_send_outstanding_bcast_packet);
 449
 450         _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
 451         return NETDEV_TX_OK;
 452
 453 packet_free:
 454         kfree(forw_packet);
 455 out_and_inc:
 456         atomic_inc(&bat_priv->bcast_queue_left);
 457 out:
 458         if (primary_if)
 459                 batadv_hardif_free_ref(primary_if);
 460         return NETDEV_TX_BUSY;
 461 }
 462
 463 static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
 464 {
 465         struct batadv_hard_iface *hard_iface;
 466         struct delayed_work *delayed_work;
 467         struct batadv_forw_packet *forw_packet;
 468         struct sk_buff *skb1;
 469         struct net_device *soft_iface;
 470         struct batadv_priv *bat_priv;
 471
 472         delayed_work = container_of(work, struct delayed_work, work);
 473         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
 474                                    delayed_work);
 475         soft_iface = forw_packet->if_incoming->soft_iface;
 476         bat_priv = netdev_priv(soft_iface);
 477
 478         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 479         hlist_del(&forw_packet->list);
 480         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 481
 482         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
 483                 goto out;
 484
 485         if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
 486                 goto out;
 487
 488         /* rebroadcast packet */
 489         rcu_read_lock();
 490         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 491                 if (hard_iface->soft_iface != soft_iface)
 492                         continue;
 493
 494                 if (forw_packet->num_packets >= hard_iface->num_bcasts)
 495                         continue;
 496
 497                 /* send a copy of the saved skb */
 498                 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
 499                 if (skb1)
 500                         batadv_send_skb_packet(skb1, hard_iface,
 501                                                batadv_broadcast_addr);
 502         }
 503         rcu_read_unlock();
 504
 505         forw_packet->num_packets++;
 506
 507         /* if we still have some more bcasts to send */
 508         if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) {
 509                 _batadv_add_bcast_packet_to_list(bat_priv, forw_packet,
 510                                                  msecs_to_jiffies(5));
 511                 return;
 512         }
 513
 514 out:
 515         batadv_forw_packet_free(forw_packet);
 516         atomic_inc(&bat_priv->bcast_queue_left);
 517 }
 518
 519 void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work)
 520 {
 521         struct delayed_work *delayed_work;
 522         struct batadv_forw_packet *forw_packet;
 523         struct batadv_priv *bat_priv;
 524
 525         delayed_work = container_of(work, struct delayed_work, work);
 526         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
 527                                    delayed_work);
 528         bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
 529         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 530         hlist_del(&forw_packet->list);
 531         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 532
 533         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
 534                 goto out;
 535
 536         bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);
 537
 538         /* we have to have at least one packet in the queue
 539          * to determine the queues wake up time unless we are
 540          * shutting down
 541          */
 542         if (forw_packet->own)
 543                 batadv_schedule_bat_ogm(forw_packet->if_incoming);
 544
 545 out:
 546         /* don't count own packet */
 547         if (!forw_packet->own)
 548                 atomic_inc(&bat_priv->batman_queue_left);
 549
 550         batadv_forw_packet_free(forw_packet);
 551 }
 552
 553 void
 554 batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
 555                                  const struct batadv_hard_iface *hard_iface)
 556 {
 557         struct batadv_forw_packet *forw_packet;
 558         struct hlist_node *safe_tmp_node;
 559         bool pending;
 560
 561         if (hard_iface)
 562                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 563                            "purge_outstanding_packets(): %s\n",
 564                            hard_iface->net_dev->name);
 565         else
 566                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 567                            "purge_outstanding_packets()\n");
 568
 569         /* free bcast list */
 570         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 571         hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
 572                                   &bat_priv->forw_bcast_list, list) {
 573                 /* if purge_outstanding_packets() was called with an argument
 574                  * we delete only packets belonging to the given interface
 575                  */
 576                 if ((hard_iface) &&
 577                     (forw_packet->if_incoming != hard_iface))
 578                         continue;
 579
 580                 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 581
 582                 /* batadv_send_outstanding_bcast_packet() will lock the list to
 583                  * delete the item from the list
 584                  */
 585                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 586                 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 587
 588                 if (pending) {
 589                         hlist_del(&forw_packet->list);
 590                         batadv_forw_packet_free(forw_packet);
 591                 }
 592         }
 593         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 594
 595         /* free batman packet list */
 596         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 597         hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
 598                                   &bat_priv->forw_bat_list, list) {
 599                 /* if purge_outstanding_packets() was called with an argument
 600                  * we delete only packets belonging to the given interface
 601                  */
 602                 if ((hard_iface) &&
 603                     (forw_packet->if_incoming != hard_iface))
 604                         continue;
 605
 606                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 607
 608                 /* send_outstanding_bat_packet() will lock the list to
 609                  * delete the item from the list
 610                  */
 611                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 612                 spin_lock_bh(&bat_priv->forw_bat_list_lock);
 613
 614                 if (pending) {
 615                         hlist_del(&forw_packet->list);
 616                         batadv_forw_packet_free(forw_packet);
 617                 }
 618         }
 619         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 620 }