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 batman_packet *batman_packet =
 167                 (struct batman_packet *)(forw_packet->skb->data);
 168         int directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0);
 169
 170         if (!forw_packet->if_incoming) {
 171                 pr_err("Error - can't forward packet: incoming iface not "
 172                        "specified\n");
 173                 return;
 174         }
 175
 176         soft_iface = forw_packet->if_incoming->soft_iface;
 177         bat_priv = netdev_priv(soft_iface);
 178
 179         if (forw_packet->if_incoming->if_status != IF_ACTIVE)
 180                 return;
 181
 182         /* multihomed peer assumed */
 183         /* non-primary OGMs are only broadcasted on their interface */
 184         if ((directlink && (batman_packet->ttl == 1)) ||
 185             (forw_packet->own && (forw_packet->if_incoming->if_num > 0))) {
 186
 187                 /* FIXME: what about aggregated packets ? */
 188                 bat_dbg(DBG_BATMAN, bat_priv,
 189                         "%s packet (originator %pM, seqno %d, TTL %d) "
 190                         "on interface %s [%pM]\n",
 191                         (forw_packet->own ? "Sending own" : "Forwarding"),
 192                         batman_packet->orig, ntohl(batman_packet->seqno),
 193                         batman_packet->ttl,
 194                         forw_packet->if_incoming->net_dev->name,
 195                         forw_packet->if_incoming->net_dev->dev_addr);
 196
 197                 /* skb is only used once and than forw_packet is free'd */
 198                 send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
 199                                 broadcast_addr);
 200                 forw_packet->skb = NULL;
 201
 202                 return;
 203         }
 204
 205         /* broadcast on every interface */
 206         rcu_read_lock();
 207         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 208                 if (hard_iface->soft_iface != soft_iface)
 209                         continue;
 210
 211                 send_packet_to_if(forw_packet, hard_iface);
 212         }
 213         rcu_read_unlock();
 214 }
 215
 216 static void realloc_packet_buffer(struct hard_iface *hard_iface,
 217                                 int new_len)
 218 {
 219         unsigned char *new_buff;
 220         struct batman_packet *batman_packet;
 221
 222         new_buff = kmalloc(new_len, GFP_ATOMIC);
 223
 224         /* keep old buffer if kmalloc should fail */
 225         if (new_buff) {
 226                 memcpy(new_buff, hard_iface->packet_buff,
 227                        sizeof(*batman_packet));
 228
 229                 kfree(hard_iface->packet_buff);
 230                 hard_iface->packet_buff = new_buff;
 231                 hard_iface->packet_len = new_len;
 232         }
 233 }
 234
 235 /* when calling this function (hard_iface == primary_if) has to be true */
 236 static void prepare_packet_buffer(struct bat_priv *bat_priv,
 237                                   struct hard_iface *hard_iface)
 238 {
 239         int new_len;
 240         struct batman_packet *batman_packet;
 241
 242         new_len = BAT_PACKET_LEN +
 243                   tt_len((uint8_t)atomic_read(&bat_priv->tt_local_changes));
 244
 245         /* if we have too many changes for one packet don't send any
 246          * and wait for the tt table request which will be fragmented */
 247         if (new_len > hard_iface->soft_iface->mtu)
 248                 new_len = BAT_PACKET_LEN;
 249
 250         realloc_packet_buffer(hard_iface, new_len);
 251         batman_packet = (struct batman_packet *)hard_iface->packet_buff;
 252
 253         atomic_set(&bat_priv->tt_crc, tt_local_crc(bat_priv));
 254
 255         /* reset the sending counter */
 256         atomic_set(&bat_priv->tt_ogm_append_cnt, TT_OGM_APPEND_MAX);
 257
 258         batman_packet->tt_num_changes = tt_changes_fill_buffer(bat_priv,
 259                                 hard_iface->packet_buff + BAT_PACKET_LEN,
 260                                 hard_iface->packet_len - BAT_PACKET_LEN);
 261
 262 }
 263
 264 static void reset_packet_buffer(struct bat_priv *bat_priv,
 265         struct hard_iface *hard_iface)
 266 {
 267         struct batman_packet *batman_packet;
 268
 269         realloc_packet_buffer(hard_iface, BAT_PACKET_LEN);
 270
 271         batman_packet = (struct batman_packet *)hard_iface->packet_buff;
 272         batman_packet->tt_num_changes = 0;
 273 }
 274
 275 void schedule_own_packet(struct hard_iface *hard_iface)
 276 {
 277         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 278         struct hard_iface *primary_if;
 279         unsigned long send_time;
 280         struct batman_packet *batman_packet;
 281         int vis_server;
 282
 283         if ((hard_iface->if_status == IF_NOT_IN_USE) ||
 284             (hard_iface->if_status == IF_TO_BE_REMOVED))
 285                 return;
 286
 287         vis_server = atomic_read(&bat_priv->vis_mode);
 288         primary_if = primary_if_get_selected(bat_priv);
 289
 290         /**
 291          * the interface gets activated here to avoid race conditions between
 292          * the moment of activating the interface in
 293          * hardif_activate_interface() where the originator mac is set and
 294          * outdated packets (especially uninitialized mac addresses) in the
 295          * packet queue
 296          */
 297         if (hard_iface->if_status == IF_TO_BE_ACTIVATED)
 298                 hard_iface->if_status = IF_ACTIVE;
 299
 300         if (hard_iface == primary_if) {
 301                 /* if at least one change happened */
 302                 if (atomic_read(&bat_priv->tt_local_changes) > 0) {
 303                         prepare_packet_buffer(bat_priv, hard_iface);
 304                         /* Increment the TTVN only once per OGM interval */
 305                         atomic_inc(&bat_priv->ttvn);
 306                 }
 307
 308                 /* if the changes have been sent enough times */
 309                 if (!atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt))
 310                         reset_packet_buffer(bat_priv, hard_iface);
 311         }
 312
 313         /**
 314          * NOTE: packet_buff might just have been re-allocated in
 315          * prepare_packet_buffer() or in reset_packet_buffer()
 316          */
 317         batman_packet = (struct batman_packet *)hard_iface->packet_buff;
 318
 319         /* change sequence number to network order */
 320         batman_packet->seqno =
 321                 htonl((uint32_t)atomic_read(&hard_iface->seqno));
 322
 323         batman_packet->ttvn = atomic_read(&bat_priv->ttvn);
 324         batman_packet->tt_crc = htons((uint16_t)atomic_read(&bat_priv->tt_crc));
 325
 326         if (vis_server == VIS_TYPE_SERVER_SYNC)
 327                 batman_packet->flags |= VIS_SERVER;
 328         else
 329                 batman_packet->flags &= ~VIS_SERVER;
 330
 331         if ((hard_iface == primary_if) &&
 332             (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
 333                 batman_packet->gw_flags =
 334                                 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 335         else
 336                 batman_packet->gw_flags = NO_FLAGS;
 337
 338         atomic_inc(&hard_iface->seqno);
 339
 340         slide_own_bcast_window(hard_iface);
 341         send_time = own_send_time(bat_priv);
 342         add_bat_packet_to_list(bat_priv,
 343                                hard_iface->packet_buff,
 344                                hard_iface->packet_len,
 345                                hard_iface, 1, send_time);
 346
 347         if (primary_if)
 348                 hardif_free_ref(primary_if);
 349 }
 350
 351 void schedule_forward_packet(struct orig_node *orig_node,
 352                              const struct ethhdr *ethhdr,
 353                              struct batman_packet *batman_packet,
 354                              int directlink,
 355                              struct hard_iface *if_incoming)
 356 {
 357         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 358         struct neigh_node *router;
 359         uint8_t in_tq, in_ttl, tq_avg = 0;
 360         unsigned long send_time;
 361         uint8_t tt_num_changes;
 362
 363         if (batman_packet->ttl <= 1) {
 364                 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
 365                 return;
 366         }
 367
 368         router = orig_node_get_router(orig_node);
 369
 370         in_tq = batman_packet->tq;
 371         in_ttl = batman_packet->ttl;
 372         tt_num_changes = batman_packet->tt_num_changes;
 373
 374         batman_packet->ttl--;
 375         memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 376
 377         /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
 378          * of our best tq value */
 379         if (router && router->tq_avg != 0) {
 380
 381                 /* rebroadcast ogm of best ranking neighbor as is */
 382                 if (!compare_eth(router->addr, ethhdr->h_source)) {
 383                         batman_packet->tq = router->tq_avg;
 384
 385                         if (router->last_ttl)
 386                                 batman_packet->ttl = router->last_ttl - 1;
 387                 }
 388
 389                 tq_avg = router->tq_avg;
 390         }
 391
 392         if (router)
 393                 neigh_node_free_ref(router);
 394
 395         /* apply hop penalty */
 396         batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv);
 397
 398         bat_dbg(DBG_BATMAN, bat_priv,
 399                 "Forwarding packet: tq_orig: %i, tq_avg: %i, "
 400                 "tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
 401                 in_tq, tq_avg, batman_packet->tq, in_ttl - 1,
 402                 batman_packet->ttl);
 403
 404         batman_packet->seqno = htonl(batman_packet->seqno);
 405         batman_packet->tt_crc = htons(batman_packet->tt_crc);
 406
 407         /* switch of primaries first hop flag when forwarding */
 408         batman_packet->flags &= ~PRIMARIES_FIRST_HOP;
 409         if (directlink)
 410                 batman_packet->flags |= DIRECTLINK;
 411         else
 412                 batman_packet->flags &= ~DIRECTLINK;
 413
 414         send_time = forward_send_time();
 415         add_bat_packet_to_list(bat_priv,
 416                                (unsigned char *)batman_packet,
 417                                sizeof(*batman_packet) + tt_len(tt_num_changes),
 418                                if_incoming, 0, send_time);
 419 }
 420
 421 static void forw_packet_free(struct forw_packet *forw_packet)
 422 {
 423         if (forw_packet->skb)
 424                 kfree_skb(forw_packet->skb);
 425         if (forw_packet->if_incoming)
 426                 hardif_free_ref(forw_packet->if_incoming);
 427         kfree(forw_packet);
 428 }
 429
 430 static void _add_bcast_packet_to_list(struct bat_priv *bat_priv,
 431                                       struct forw_packet *forw_packet,
 432                                       unsigned long send_time)
 433 {
 434         INIT_HLIST_NODE(&forw_packet->list);
 435
 436         /* add new packet to packet list */
 437         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 438         hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
 439         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 440
 441         /* start timer for this packet */
 442         INIT_DELAYED_WORK(&forw_packet->delayed_work,
 443                           send_outstanding_bcast_packet);
 444         queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work,
 445                            send_time);
 446 }
 447
 448 /* add a broadcast packet to the queue and setup timers. broadcast packets
 449  * are sent multiple times to increase probability for beeing received.
 450  *
 451  * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
 452  * errors.
 453  *
 454  * The skb is not consumed, so the caller should make sure that the
 455  * skb is freed. */
 456 int add_bcast_packet_to_list(struct bat_priv *bat_priv,
 457                              const struct sk_buff *skb)
 458 {
 459         struct hard_iface *primary_if = NULL;
 460         struct forw_packet *forw_packet;
 461         struct bcast_packet *bcast_packet;
 462         struct sk_buff *newskb;
 463
 464         if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
 465                 bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n");
 466                 goto out;
 467         }
 468
 469         primary_if = primary_if_get_selected(bat_priv);
 470         if (!primary_if)
 471                 goto out_and_inc;
 472
 473         forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
 474
 475         if (!forw_packet)
 476                 goto out_and_inc;
 477
 478         newskb = skb_copy(skb, GFP_ATOMIC);
 479         if (!newskb)
 480                 goto packet_free;
 481
 482         /* as we have a copy now, it is safe to decrease the TTL */
 483         bcast_packet = (struct bcast_packet *)newskb->data;
 484         bcast_packet->ttl--;
 485
 486         skb_reset_mac_header(newskb);
 487
 488         forw_packet->skb = newskb;
 489         forw_packet->if_incoming = primary_if;
 490
 491         /* how often did we send the bcast packet ? */
 492         forw_packet->num_packets = 0;
 493
 494         _add_bcast_packet_to_list(bat_priv, forw_packet, 1);
 495         return NETDEV_TX_OK;
 496
 497 packet_free:
 498         kfree(forw_packet);
 499 out_and_inc:
 500         atomic_inc(&bat_priv->bcast_queue_left);
 501 out:
 502         if (primary_if)
 503                 hardif_free_ref(primary_if);
 504         return NETDEV_TX_BUSY;
 505 }
 506
 507 static void send_outstanding_bcast_packet(struct work_struct *work)
 508 {
 509         struct hard_iface *hard_iface;
 510         struct delayed_work *delayed_work =
 511                 container_of(work, struct delayed_work, work);
 512         struct forw_packet *forw_packet =
 513                 container_of(delayed_work, struct forw_packet, delayed_work);
 514         struct sk_buff *skb1;
 515         struct net_device *soft_iface = forw_packet->if_incoming->soft_iface;
 516         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 517
 518         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 519         hlist_del(&forw_packet->list);
 520         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 521
 522         if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
 523                 goto out;
 524
 525         /* rebroadcast packet */
 526         rcu_read_lock();
 527         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 528                 if (hard_iface->soft_iface != soft_iface)
 529                         continue;
 530
 531                 /* send a copy of the saved skb */
 532                 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
 533                 if (skb1)
 534                         send_skb_packet(skb1, hard_iface, broadcast_addr);
 535         }
 536         rcu_read_unlock();
 537
 538         forw_packet->num_packets++;
 539
 540         /* if we still have some more bcasts to send */
 541         if (forw_packet->num_packets < 3) {
 542                 _add_bcast_packet_to_list(bat_priv, forw_packet,
 543                                           ((5 * HZ) / 1000));
 544                 return;
 545         }
 546
 547 out:
 548         forw_packet_free(forw_packet);
 549         atomic_inc(&bat_priv->bcast_queue_left);
 550 }
 551
 552 void send_outstanding_bat_packet(struct work_struct *work)
 553 {
 554         struct delayed_work *delayed_work =
 555                 container_of(work, struct delayed_work, work);
 556         struct forw_packet *forw_packet =
 557                 container_of(delayed_work, struct forw_packet, delayed_work);
 558         struct bat_priv *bat_priv;
 559
 560         bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
 561         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 562         hlist_del(&forw_packet->list);
 563         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 564
 565         if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
 566                 goto out;
 567
 568         send_packet(forw_packet);
 569
 570         /**
 571          * we have to have at least one packet in the queue
 572          * to determine the queues wake up time unless we are
 573          * shutting down
 574          */
 575         if (forw_packet->own)
 576                 schedule_own_packet(forw_packet->if_incoming);
 577
 578 out:
 579         /* don't count own packet */
 580         if (!forw_packet->own)
 581                 atomic_inc(&bat_priv->batman_queue_left);
 582
 583         forw_packet_free(forw_packet);
 584 }
 585
 586 void purge_outstanding_packets(struct bat_priv *bat_priv,
 587                                const struct hard_iface *hard_iface)
 588 {
 589         struct forw_packet *forw_packet;
 590         struct hlist_node *tmp_node, *safe_tmp_node;
 591         bool pending;
 592
 593         if (hard_iface)
 594                 bat_dbg(DBG_BATMAN, bat_priv,
 595                         "purge_outstanding_packets(): %s\n",
 596                         hard_iface->net_dev->name);
 597         else
 598                 bat_dbg(DBG_BATMAN, bat_priv,
 599                         "purge_outstanding_packets()\n");
 600
 601         /* free bcast list */
 602         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 603         hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
 604                                   &bat_priv->forw_bcast_list, list) {
 605
 606                 /**
 607                  * if purge_outstanding_packets() was called with an argmument
 608                  * we delete only packets belonging to the given interface
 609                  */
 610                 if ((hard_iface) &&
 611                     (forw_packet->if_incoming != hard_iface))
 612                         continue;
 613
 614                 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 615
 616                 /**
 617                  * send_outstanding_bcast_packet() will lock the list to
 618                  * delete the item from the list
 619                  */
 620                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 621                 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 622
 623                 if (pending) {
 624                         hlist_del(&forw_packet->list);
 625                         forw_packet_free(forw_packet);
 626                 }
 627         }
 628         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 629
 630         /* free batman packet list */
 631         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 632         hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
 633                                   &bat_priv->forw_bat_list, list) {
 634
 635                 /**
 636                  * if purge_outstanding_packets() was called with an argmument
 637                  * we delete only packets belonging to the given interface
 638                  */
 639                 if ((hard_iface) &&
 640                     (forw_packet->if_incoming != hard_iface))
 641                         continue;
 642
 643                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 644
 645                 /**
 646                  * send_outstanding_bat_packet() will lock the list to
 647                  * delete the item from the list
 648                  */
 649                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 650                 spin_lock_bh(&bat_priv->forw_bat_list_lock);
 651
 652                 if (pending) {
 653                         hlist_del(&forw_packet->list);
 654                         forw_packet_free(forw_packet);
 655                 }
 656         }
 657         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 658 }