net/batman-adv/send.c

   1 /*
   2  * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "send.h"
  24 #include "routing.h"
  25 #include "translation-table.h"
  26 #include "soft-interface.h"
  27 #include "hard-interface.h"
  28 #include "vis.h"
  29 #include "aggregation.h"
  30 #include "gateway_common.h"
  31 #include "originator.h"
  32
  33 static void send_outstanding_bcast_packet(struct work_struct *work);
  34
  35 /* apply hop penalty for a normal link */
  36 static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
  37 {
  38         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
  39         return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
  40 }
  41
  42 /* when do we schedule our own packet to be sent */
  43 static unsigned long own_send_time(const struct bat_priv *bat_priv)
  44 {
  45         return jiffies + msecs_to_jiffies(
  46                    atomic_read(&bat_priv->orig_interval) -
  47                    JITTER + (random32() % 2*JITTER));
  48 }
  49
  50 /* when do we schedule a forwarded packet to be sent */
  51 static unsigned long forward_send_time(void)
  52 {
  53         return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
  54 }
  55
  56 /* send out an already prepared packet to the given address via the
  57  * specified batman interface */
  58 int send_skb_packet(struct sk_buff *skb, struct hard_iface *hard_iface,
  59                     const uint8_t *dst_addr)
  60 {
  61         struct ethhdr *ethhdr;
  62
  63         if (hard_iface->if_status != IF_ACTIVE)
  64                 goto send_skb_err;
  65
  66         if (unlikely(!hard_iface->net_dev))
  67                 goto send_skb_err;
  68
  69         if (!(hard_iface->net_dev->flags & IFF_UP)) {
  70                 pr_warning("Interface %s is not up - can't send packet via "
  71                            "that interface!\n", hard_iface->net_dev->name);
  72                 goto send_skb_err;
  73         }
  74
  75         /* push to the ethernet header. */
  76         if (my_skb_head_push(skb, sizeof(*ethhdr)) < 0)
  77                 goto send_skb_err;
  78
  79         skb_reset_mac_header(skb);
  80
  81         ethhdr = (struct ethhdr *) skb_mac_header(skb);
  82         memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
  83         memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
  84         ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);
  85
  86         skb_set_network_header(skb, ETH_HLEN);
  87         skb->priority = TC_PRIO_CONTROL;
  88         skb->protocol = __constant_htons(ETH_P_BATMAN);
  89
  90         skb->dev = hard_iface->net_dev;
  91
  92         /* dev_queue_xmit() returns a negative result on error.  However on
  93          * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
  94          * (which is > 0). This will not be treated as an error. */
  95
  96         return dev_queue_xmit(skb);
  97 send_skb_err:
  98         kfree_skb(skb);
  99         return NET_XMIT_DROP;
 100 }
 101
 102 /* Send a packet to a given interface */
 103 static void send_packet_to_if(struct forw_packet *forw_packet,
 104                               struct hard_iface *hard_iface)
 105 {
 106         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 107         char *fwd_str;
 108         uint8_t packet_num;
 109         int16_t buff_pos;
 110         struct batman_packet *batman_packet;
 111         struct sk_buff *skb;
 112
 113         if (hard_iface->if_status != IF_ACTIVE)
 114                 return;
 115
 116         packet_num = 0;
 117         buff_pos = 0;
 118         batman_packet = (struct batman_packet *)forw_packet->skb->data;
 119
 120         /* adjust all flags and log packets */
 121         while (aggregated_packet(buff_pos,
 122                                  forw_packet->packet_len,
 123                                  batman_packet->tt_num_changes)) {
 124
 125                 /* we might have aggregated direct link packets with an
 126                  * ordinary base packet */
 127                 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
 128                     (forw_packet->if_incoming == hard_iface))
 129                         batman_packet->flags |= DIRECTLINK;
 130                 else
 131                         batman_packet->flags &= ~DIRECTLINK;
 132
 133                 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
 134                                                             "Sending own" :
 135                                                             "Forwarding"));
 136                 bat_dbg(DBG_BATMAN, bat_priv,
 137                         "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d,"
 138                         " IDF %s, hvn %d) on interface %s [%pM]\n",
 139                         fwd_str, (packet_num > 0 ? "aggregated " : ""),
 140                         batman_packet->orig, ntohl(batman_packet->seqno),
 141                         batman_packet->tq, batman_packet->ttl,
 142                         (batman_packet->flags & DIRECTLINK ?
 143                          "on" : "off"),
 144                         batman_packet->ttvn, hard_iface->net_dev->name,
 145                         hard_iface->net_dev->dev_addr);
 146
 147                 buff_pos += sizeof(*batman_packet) +
 148                         tt_len(batman_packet->tt_num_changes);
 149                 packet_num++;
 150                 batman_packet = (struct batman_packet *)
 151                         (forw_packet->skb->data + buff_pos);
 152         }
 153
 154         /* create clone because function is called more than once */
 155         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 156         if (skb)
 157                 send_skb_packet(skb, hard_iface, broadcast_addr);
 158 }
 159
 160 /* send a batman packet */
 161 static void send_packet(struct forw_packet *forw_packet)
 162 {
 163         struct hard_iface *hard_iface;
 164         struct net_device *soft_iface;
 165         struct bat_priv *bat_priv;
 166         struct hard_iface *primary_if = NULL;
 167         struct batman_packet *batman_packet =
 168                 (struct batman_packet *)(forw_packet->skb->data);
 169         int directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0);
 170
 171         if (!forw_packet->if_incoming) {
 172                 pr_err("Error - can't forward packet: incoming iface not "
 173                        "specified\n");
 174                 goto out;
 175         }
 176
 177         soft_iface = forw_packet->if_incoming->soft_iface;
 178         bat_priv = netdev_priv(soft_iface);
 179
 180         if (forw_packet->if_incoming->if_status != IF_ACTIVE)
 181                 goto out;
 182
 183         primary_if = primary_if_get_selected(bat_priv);
 184         if (!primary_if)
 185                 goto out;
 186
 187         /* multihomed peer assumed */
 188         /* non-primary OGMs are only broadcasted on their interface */
 189         if ((directlink && (batman_packet->ttl == 1)) ||
 190             (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
 191
 192                 /* FIXME: what about aggregated packets ? */
 193                 bat_dbg(DBG_BATMAN, bat_priv,
 194                         "%s packet (originator %pM, seqno %d, TTL %d) "
 195                         "on interface %s [%pM]\n",
 196                         (forw_packet->own ? "Sending own" : "Forwarding"),
 197                         batman_packet->orig, ntohl(batman_packet->seqno),
 198                         batman_packet->ttl,
 199                         forw_packet->if_incoming->net_dev->name,
 200                         forw_packet->if_incoming->net_dev->dev_addr);
 201
 202                 /* skb is only used once and than forw_packet is free'd */
 203                 send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
 204                                 broadcast_addr);
 205                 forw_packet->skb = NULL;
 206
 207                 goto out;
 208         }
 209
 210         /* broadcast on every interface */
 211         rcu_read_lock();
 212         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 213                 if (hard_iface->soft_iface != soft_iface)
 214                         continue;
 215
 216                 send_packet_to_if(forw_packet, hard_iface);
 217         }
 218         rcu_read_unlock();
 219
 220 out:
 221         if (primary_if)
 222                 hardif_free_ref(primary_if);
 223 }
 224
 225 static void realloc_packet_buffer(struct hard_iface *hard_iface,
 226                                 int new_len)
 227 {
 228         unsigned char *new_buff;
 229         struct batman_packet *batman_packet;
 230
 231         new_buff = kmalloc(new_len, GFP_ATOMIC);
 232
 233         /* keep old buffer if kmalloc should fail */
 234         if (new_buff) {
 235                 memcpy(new_buff, hard_iface->packet_buff,
 236                        sizeof(*batman_packet));
 237
 238                 kfree(hard_iface->packet_buff);
 239                 hard_iface->packet_buff = new_buff;
 240                 hard_iface->packet_len = new_len;
 241         }
 242 }
 243
 244 /* when calling this function (hard_iface == primary_if) has to be true */
 245 static void prepare_packet_buffer(struct bat_priv *bat_priv,
 246                                   struct hard_iface *hard_iface)
 247 {
 248         int new_len;
 249         struct batman_packet *batman_packet;
 250
 251         new_len = BAT_PACKET_LEN +
 252                   tt_len((uint8_t)atomic_read(&bat_priv->tt_local_changes));
 253
 254         /* if we have too many changes for one packet don't send any
 255          * and wait for the tt table request which will be fragmented */
 256         if (new_len > hard_iface->soft_iface->mtu)
 257                 new_len = BAT_PACKET_LEN;
 258
 259         realloc_packet_buffer(hard_iface, new_len);
 260         batman_packet = (struct batman_packet *)hard_iface->packet_buff;
 261
 262         atomic_set(&bat_priv->tt_crc, tt_local_crc(bat_priv));
 263
 264         /* reset the sending counter */
 265         atomic_set(&bat_priv->tt_ogm_append_cnt, TT_OGM_APPEND_MAX);
 266
 267         batman_packet->tt_num_changes = tt_changes_fill_buffer(bat_priv,
 268                                 hard_iface->packet_buff + BAT_PACKET_LEN,
 269                                 hard_iface->packet_len - BAT_PACKET_LEN);
 270
 271 }
 272
 273 static void reset_packet_buffer(struct bat_priv *bat_priv,
 274         struct hard_iface *hard_iface)
 275 {
 276         struct batman_packet *batman_packet;
 277
 278         realloc_packet_buffer(hard_iface, BAT_PACKET_LEN);
 279
 280         batman_packet = (struct batman_packet *)hard_iface->packet_buff;
 281         batman_packet->tt_num_changes = 0;
 282 }
 283
 284 void schedule_own_packet(struct hard_iface *hard_iface)
 285 {
 286         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 287         struct hard_iface *primary_if;
 288         unsigned long send_time;
 289         struct batman_packet *batman_packet;
 290         int vis_server;
 291
 292         if ((hard_iface->if_status == IF_NOT_IN_USE) ||
 293             (hard_iface->if_status == IF_TO_BE_REMOVED))
 294                 return;
 295
 296         vis_server = atomic_read(&bat_priv->vis_mode);
 297         primary_if = primary_if_get_selected(bat_priv);
 298
 299         /**
 300          * the interface gets activated here to avoid race conditions between
 301          * the moment of activating the interface in
 302          * hardif_activate_interface() where the originator mac is set and
 303          * outdated packets (especially uninitialized mac addresses) in the
 304          * packet queue
 305          */
 306         if (hard_iface->if_status == IF_TO_BE_ACTIVATED)
 307                 hard_iface->if_status = IF_ACTIVE;
 308
 309         if (hard_iface == primary_if) {
 310                 /* if at least one change happened */
 311                 if (atomic_read(&bat_priv->tt_local_changes) > 0) {
 312                         tt_commit_changes(bat_priv);
 313                         prepare_packet_buffer(bat_priv, hard_iface);
 314                 }
 315
 316                 /* if the changes have been sent enough times */
 317                 if (!atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt))
 318                         reset_packet_buffer(bat_priv, hard_iface);
 319         }
 320
 321         /**
 322          * NOTE: packet_buff might just have been re-allocated in
 323          * prepare_packet_buffer() or in reset_packet_buffer()
 324          */
 325         batman_packet = (struct batman_packet *)hard_iface->packet_buff;
 326
 327         /* change sequence number to network order */
 328         batman_packet->seqno =
 329                 htonl((uint32_t)atomic_read(&hard_iface->seqno));
 330
 331         batman_packet->ttvn = atomic_read(&bat_priv->ttvn);
 332         batman_packet->tt_crc = htons((uint16_t)atomic_read(&bat_priv->tt_crc));
 333
 334         if (vis_server == VIS_TYPE_SERVER_SYNC)
 335                 batman_packet->flags |= VIS_SERVER;
 336         else
 337                 batman_packet->flags &= ~VIS_SERVER;
 338
 339         if ((hard_iface == primary_if) &&
 340             (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
 341                 batman_packet->gw_flags =
 342                                 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 343         else
 344                 batman_packet->gw_flags = NO_FLAGS;
 345
 346         atomic_inc(&hard_iface->seqno);
 347
 348         slide_own_bcast_window(hard_iface);
 349         send_time = own_send_time(bat_priv);
 350         add_bat_packet_to_list(bat_priv,
 351                                hard_iface->packet_buff,
 352                                hard_iface->packet_len,
 353                                hard_iface, 1, send_time);
 354
 355         if (primary_if)
 356                 hardif_free_ref(primary_if);
 357 }
 358
 359 void schedule_forward_packet(struct orig_node *orig_node,
 360                              const struct ethhdr *ethhdr,
 361                              struct batman_packet *batman_packet,
 362                              int directlink,
 363                              struct hard_iface *if_incoming)
 364 {
 365         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 366         struct neigh_node *router;
 367         uint8_t in_tq, in_ttl, tq_avg = 0;
 368         unsigned long send_time;
 369         uint8_t tt_num_changes;
 370
 371         if (batman_packet->ttl <= 1) {
 372                 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
 373                 return;
 374         }
 375
 376         router = orig_node_get_router(orig_node);
 377
 378         in_tq = batman_packet->tq;
 379         in_ttl = batman_packet->ttl;
 380         tt_num_changes = batman_packet->tt_num_changes;
 381
 382         batman_packet->ttl--;
 383         memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 384
 385         /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
 386          * of our best tq value */
 387         if (router && router->tq_avg != 0) {
 388
 389                 /* rebroadcast ogm of best ranking neighbor as is */
 390                 if (!compare_eth(router->addr, ethhdr->h_source)) {
 391                         batman_packet->tq = router->tq_avg;
 392
 393                         if (router->last_ttl)
 394                                 batman_packet->ttl = router->last_ttl - 1;
 395                 }
 396
 397                 tq_avg = router->tq_avg;
 398         }
 399
 400         if (router)
 401                 neigh_node_free_ref(router);
 402
 403         /* apply hop penalty */
 404         batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv);
 405
 406         bat_dbg(DBG_BATMAN, bat_priv,
 407                 "Forwarding packet: tq_orig: %i, tq_avg: %i, "
 408                 "tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
 409                 in_tq, tq_avg, batman_packet->tq, in_ttl - 1,
 410                 batman_packet->ttl);
 411
 412         batman_packet->seqno = htonl(batman_packet->seqno);
 413         batman_packet->tt_crc = htons(batman_packet->tt_crc);
 414
 415         /* switch of primaries first hop flag when forwarding */
 416         batman_packet->flags &= ~PRIMARIES_FIRST_HOP;
 417         if (directlink)
 418                 batman_packet->flags |= DIRECTLINK;
 419         else
 420                 batman_packet->flags &= ~DIRECTLINK;
 421
 422         send_time = forward_send_time();
 423         add_bat_packet_to_list(bat_priv,
 424                                (unsigned char *)batman_packet,
 425                                sizeof(*batman_packet) + tt_len(tt_num_changes),
 426                                if_incoming, 0, send_time);
 427 }
 428
 429 static void forw_packet_free(struct forw_packet *forw_packet)
 430 {
 431         if (forw_packet->skb)
 432                 kfree_skb(forw_packet->skb);
 433         if (forw_packet->if_incoming)
 434                 hardif_free_ref(forw_packet->if_incoming);
 435         kfree(forw_packet);
 436 }
 437
 438 static void _add_bcast_packet_to_list(struct bat_priv *bat_priv,
 439                                       struct forw_packet *forw_packet,
 440                                       unsigned long send_time)
 441 {
 442         INIT_HLIST_NODE(&forw_packet->list);
 443
 444         /* add new packet to packet list */
 445         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 446         hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
 447         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 448
 449         /* start timer for this packet */
 450         INIT_DELAYED_WORK(&forw_packet->delayed_work,
 451                           send_outstanding_bcast_packet);
 452         queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work,
 453                            send_time);
 454 }
 455
 456 /* add a broadcast packet to the queue and setup timers. broadcast packets
 457  * are sent multiple times to increase probability for beeing received.
 458  *
 459  * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
 460  * errors.
 461  *
 462  * The skb is not consumed, so the caller should make sure that the
 463  * skb is freed. */
 464 int add_bcast_packet_to_list(struct bat_priv *bat_priv,
 465                              const struct sk_buff *skb, unsigned long delay)
 466 {
 467         struct hard_iface *primary_if = NULL;
 468         struct forw_packet *forw_packet;
 469         struct bcast_packet *bcast_packet;
 470         struct sk_buff *newskb;
 471
 472         if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
 473                 bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n");
 474                 goto out;
 475         }
 476
 477         primary_if = primary_if_get_selected(bat_priv);
 478         if (!primary_if)
 479                 goto out_and_inc;
 480
 481         forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
 482
 483         if (!forw_packet)
 484                 goto out_and_inc;
 485
 486         newskb = skb_copy(skb, GFP_ATOMIC);
 487         if (!newskb)
 488                 goto packet_free;
 489
 490         /* as we have a copy now, it is safe to decrease the TTL */
 491         bcast_packet = (struct bcast_packet *)newskb->data;
 492         bcast_packet->ttl--;
 493
 494         skb_reset_mac_header(newskb);
 495
 496         forw_packet->skb = newskb;
 497         forw_packet->if_incoming = primary_if;
 498
 499         /* how often did we send the bcast packet ? */
 500         forw_packet->num_packets = 0;
 501
 502         _add_bcast_packet_to_list(bat_priv, forw_packet, delay);
 503         return NETDEV_TX_OK;
 504
 505 packet_free:
 506         kfree(forw_packet);
 507 out_and_inc:
 508         atomic_inc(&bat_priv->bcast_queue_left);
 509 out:
 510         if (primary_if)
 511                 hardif_free_ref(primary_if);
 512         return NETDEV_TX_BUSY;
 513 }
 514
 515 static void send_outstanding_bcast_packet(struct work_struct *work)
 516 {
 517         struct hard_iface *hard_iface;
 518         struct delayed_work *delayed_work =
 519                 container_of(work, struct delayed_work, work);
 520         struct forw_packet *forw_packet =
 521                 container_of(delayed_work, struct forw_packet, delayed_work);
 522         struct sk_buff *skb1;
 523         struct net_device *soft_iface = forw_packet->if_incoming->soft_iface;
 524         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 525
 526         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 527         hlist_del(&forw_packet->list);
 528         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 529
 530         if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
 531                 goto out;
 532
 533         /* rebroadcast packet */
 534         rcu_read_lock();
 535         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 536                 if (hard_iface->soft_iface != soft_iface)
 537                         continue;
 538
 539                 /* send a copy of the saved skb */
 540                 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
 541                 if (skb1)
 542                         send_skb_packet(skb1, hard_iface, broadcast_addr);
 543         }
 544         rcu_read_unlock();
 545
 546         forw_packet->num_packets++;
 547
 548         /* if we still have some more bcasts to send */
 549         if (forw_packet->num_packets < 3) {
 550                 _add_bcast_packet_to_list(bat_priv, forw_packet,
 551                                           ((5 * HZ) / 1000));
 552                 return;
 553         }
 554
 555 out:
 556         forw_packet_free(forw_packet);
 557         atomic_inc(&bat_priv->bcast_queue_left);
 558 }
 559
 560 void send_outstanding_bat_packet(struct work_struct *work)
 561 {
 562         struct delayed_work *delayed_work =
 563                 container_of(work, struct delayed_work, work);
 564         struct forw_packet *forw_packet =
 565                 container_of(delayed_work, struct forw_packet, delayed_work);
 566         struct bat_priv *bat_priv;
 567
 568         bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
 569         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 570         hlist_del(&forw_packet->list);
 571         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 572
 573         if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
 574                 goto out;
 575
 576         send_packet(forw_packet);
 577
 578         /**
 579          * we have to have at least one packet in the queue
 580          * to determine the queues wake up time unless we are
 581          * shutting down
 582          */
 583         if (forw_packet->own)
 584                 schedule_own_packet(forw_packet->if_incoming);
 585
 586 out:
 587         /* don't count own packet */
 588         if (!forw_packet->own)
 589                 atomic_inc(&bat_priv->batman_queue_left);
 590
 591         forw_packet_free(forw_packet);
 592 }
 593
 594 void purge_outstanding_packets(struct bat_priv *bat_priv,
 595                                const struct hard_iface *hard_iface)
 596 {
 597         struct forw_packet *forw_packet;
 598         struct hlist_node *tmp_node, *safe_tmp_node;
 599         bool pending;
 600
 601         if (hard_iface)
 602                 bat_dbg(DBG_BATMAN, bat_priv,
 603                         "purge_outstanding_packets(): %s\n",
 604                         hard_iface->net_dev->name);
 605         else
 606                 bat_dbg(DBG_BATMAN, bat_priv,
 607                         "purge_outstanding_packets()\n");
 608
 609         /* free bcast list */
 610         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 611         hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
 612                                   &bat_priv->forw_bcast_list, list) {
 613
 614                 /**
 615                  * if purge_outstanding_packets() was called with an argmument
 616                  * we delete only packets belonging to the given interface
 617                  */
 618                 if ((hard_iface) &&
 619                     (forw_packet->if_incoming != hard_iface))
 620                         continue;
 621
 622                 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 623
 624                 /**
 625                  * send_outstanding_bcast_packet() will lock the list to
 626                  * delete the item from the list
 627                  */
 628                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 629                 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 630
 631                 if (pending) {
 632                         hlist_del(&forw_packet->list);
 633                         forw_packet_free(forw_packet);
 634                 }
 635         }
 636         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 637
 638         /* free batman packet list */
 639         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 640         hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
 641                                   &bat_priv->forw_bat_list, list) {
 642
 643                 /**
 644                  * if purge_outstanding_packets() was called with an argmument
 645                  * we delete only packets belonging to the given interface
 646                  */
 647                 if ((hard_iface) &&
 648                     (forw_packet->if_incoming != hard_iface))
 649                         continue;
 650
 651                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 652
 653                 /**
 654                  * send_outstanding_bat_packet() will lock the list to
 655                  * delete the item from the list
 656                  */
 657                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 658                 spin_lock_bh(&bat_priv->forw_bat_list_lock);
 659
 660                 if (pending) {
 661                         hlist_del(&forw_packet->list);
 662                         forw_packet_free(forw_packet);
 663                 }
 664         }
 665         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 666 }