Pileus Git - ~andy/linux/blob - 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                         prepare_packet_buffer(bat_priv, hard_iface);
 313                         /* Increment the TTVN only once per OGM interval */
 314                         atomic_inc(&bat_priv->ttvn);
 315                         bat_priv->tt_poss_change = false;
 316                 }
 317
 318                 /* if the changes have been sent enough times */
 319                 if (!atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt))
 320                         reset_packet_buffer(bat_priv, hard_iface);
 321         }
 322
 323         /**
 324          * NOTE: packet_buff might just have been re-allocated in
 325          * prepare_packet_buffer() or in reset_packet_buffer()
 326          */
 327         batman_packet = (struct batman_packet *)hard_iface->packet_buff;
 328
 329         /* change sequence number to network order */
 330         batman_packet->seqno =
 331                 htonl((uint32_t)atomic_read(&hard_iface->seqno));
 332
 333         batman_packet->ttvn = atomic_read(&bat_priv->ttvn);
 334         batman_packet->tt_crc = htons((uint16_t)atomic_read(&bat_priv->tt_crc));
 335
 336         if (vis_server == VIS_TYPE_SERVER_SYNC)
 337                 batman_packet->flags |= VIS_SERVER;
 338         else
 339                 batman_packet->flags &= ~VIS_SERVER;
 340
 341         if ((hard_iface == primary_if) &&
 342             (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
 343                 batman_packet->gw_flags =
 344                                 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 345         else
 346                 batman_packet->gw_flags = NO_FLAGS;
 347
 348         atomic_inc(&hard_iface->seqno);
 349
 350         slide_own_bcast_window(hard_iface);
 351         send_time = own_send_time(bat_priv);
 352         add_bat_packet_to_list(bat_priv,
 353                                hard_iface->packet_buff,
 354                                hard_iface->packet_len,
 355                                hard_iface, 1, send_time);
 356
 357         if (primary_if)
 358                 hardif_free_ref(primary_if);
 359 }
 360
 361 void schedule_forward_packet(struct orig_node *orig_node,
 362                              const struct ethhdr *ethhdr,
 363                              struct batman_packet *batman_packet,
 364                              int directlink,
 365                              struct hard_iface *if_incoming)
 366 {
 367         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 368         struct neigh_node *router;
 369         uint8_t in_tq, in_ttl, tq_avg = 0;
 370         unsigned long send_time;
 371         uint8_t tt_num_changes;
 372
 373         if (batman_packet->ttl <= 1) {
 374                 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
 375                 return;
 376         }
 377
 378         router = orig_node_get_router(orig_node);
 379
 380         in_tq = batman_packet->tq;
 381         in_ttl = batman_packet->ttl;
 382         tt_num_changes = batman_packet->tt_num_changes;
 383
 384         batman_packet->ttl--;
 385         memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 386
 387         /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
 388          * of our best tq value */
 389         if (router && router->tq_avg != 0) {
 390
 391                 /* rebroadcast ogm of best ranking neighbor as is */
 392                 if (!compare_eth(router->addr, ethhdr->h_source)) {
 393                         batman_packet->tq = router->tq_avg;
 394
 395                         if (router->last_ttl)
 396                                 batman_packet->ttl = router->last_ttl - 1;
 397                 }
 398
 399                 tq_avg = router->tq_avg;
 400         }
 401
 402         if (router)
 403                 neigh_node_free_ref(router);
 404
 405         /* apply hop penalty */
 406         batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv);
 407
 408         bat_dbg(DBG_BATMAN, bat_priv,
 409                 "Forwarding packet: tq_orig: %i, tq_avg: %i, "
 410                 "tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
 411                 in_tq, tq_avg, batman_packet->tq, in_ttl - 1,
 412                 batman_packet->ttl);
 413
 414         batman_packet->seqno = htonl(batman_packet->seqno);
 415         batman_packet->tt_crc = htons(batman_packet->tt_crc);
 416
 417         /* switch of primaries first hop flag when forwarding */
 418         batman_packet->flags &= ~PRIMARIES_FIRST_HOP;
 419         if (directlink)
 420                 batman_packet->flags |= DIRECTLINK;
 421         else
 422                 batman_packet->flags &= ~DIRECTLINK;
 423
 424         send_time = forward_send_time();
 425         add_bat_packet_to_list(bat_priv,
 426                                (unsigned char *)batman_packet,
 427                                sizeof(*batman_packet) + tt_len(tt_num_changes),
 428                                if_incoming, 0, send_time);
 429 }
 430
 431 static void forw_packet_free(struct forw_packet *forw_packet)
 432 {
 433         if (forw_packet->skb)
 434                 kfree_skb(forw_packet->skb);
 435         if (forw_packet->if_incoming)
 436                 hardif_free_ref(forw_packet->if_incoming);
 437         kfree(forw_packet);
 438 }
 439
 440 static void _add_bcast_packet_to_list(struct bat_priv *bat_priv,
 441                                       struct forw_packet *forw_packet,
 442                                       unsigned long send_time)
 443 {
 444         INIT_HLIST_NODE(&forw_packet->list);
 445
 446         /* add new packet to packet list */
 447         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 448         hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
 449         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 450
 451         /* start timer for this packet */
 452         INIT_DELAYED_WORK(&forw_packet->delayed_work,
 453                           send_outstanding_bcast_packet);
 454         queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work,
 455                            send_time);
 456 }
 457
 458 /* add a broadcast packet to the queue and setup timers. broadcast packets
 459  * are sent multiple times to increase probability for beeing received.
 460  *
 461  * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
 462  * errors.
 463  *
 464  * The skb is not consumed, so the caller should make sure that the
 465  * skb is freed. */
 466 int add_bcast_packet_to_list(struct bat_priv *bat_priv,
 467                              const struct sk_buff *skb, unsigned long delay)
 468 {
 469         struct hard_iface *primary_if = NULL;
 470         struct forw_packet *forw_packet;
 471         struct bcast_packet *bcast_packet;
 472         struct sk_buff *newskb;
 473
 474         if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
 475                 bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n");
 476                 goto out;
 477         }
 478
 479         primary_if = primary_if_get_selected(bat_priv);
 480         if (!primary_if)
 481                 goto out_and_inc;
 482
 483         forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
 484
 485         if (!forw_packet)
 486                 goto out_and_inc;
 487
 488         newskb = skb_copy(skb, GFP_ATOMIC);
 489         if (!newskb)
 490                 goto packet_free;
 491
 492         /* as we have a copy now, it is safe to decrease the TTL */
 493         bcast_packet = (struct bcast_packet *)newskb->data;
 494         bcast_packet->ttl--;
 495
 496         skb_reset_mac_header(newskb);
 497
 498         forw_packet->skb = newskb;
 499         forw_packet->if_incoming = primary_if;
 500
 501         /* how often did we send the bcast packet ? */
 502         forw_packet->num_packets = 0;
 503
 504         _add_bcast_packet_to_list(bat_priv, forw_packet, delay);
 505         return NETDEV_TX_OK;
 506
 507 packet_free:
 508         kfree(forw_packet);
 509 out_and_inc:
 510         atomic_inc(&bat_priv->bcast_queue_left);
 511 out:
 512         if (primary_if)
 513                 hardif_free_ref(primary_if);
 514         return NETDEV_TX_BUSY;
 515 }
 516
 517 static void send_outstanding_bcast_packet(struct work_struct *work)
 518 {
 519         struct hard_iface *hard_iface;
 520         struct delayed_work *delayed_work =
 521                 container_of(work, struct delayed_work, work);
 522         struct forw_packet *forw_packet =
 523                 container_of(delayed_work, struct forw_packet, delayed_work);
 524         struct sk_buff *skb1;
 525         struct net_device *soft_iface = forw_packet->if_incoming->soft_iface;
 526         struct bat_priv *bat_priv = netdev_priv(soft_iface);
 527
 528         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 529         hlist_del(&forw_packet->list);
 530         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 531
 532         if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
 533                 goto out;
 534
 535         /* rebroadcast packet */
 536         rcu_read_lock();
 537         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 538                 if (hard_iface->soft_iface != soft_iface)
 539                         continue;
 540
 541                 /* send a copy of the saved skb */
 542                 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
 543                 if (skb1)
 544                         send_skb_packet(skb1, hard_iface, broadcast_addr);
 545         }
 546         rcu_read_unlock();
 547
 548         forw_packet->num_packets++;
 549
 550         /* if we still have some more bcasts to send */
 551         if (forw_packet->num_packets < 3) {
 552                 _add_bcast_packet_to_list(bat_priv, forw_packet,
 553                                           ((5 * HZ) / 1000));
 554                 return;
 555         }
 556
 557 out:
 558         forw_packet_free(forw_packet);
 559         atomic_inc(&bat_priv->bcast_queue_left);
 560 }
 561
 562 void send_outstanding_bat_packet(struct work_struct *work)
 563 {
 564         struct delayed_work *delayed_work =
 565                 container_of(work, struct delayed_work, work);
 566         struct forw_packet *forw_packet =
 567                 container_of(delayed_work, struct forw_packet, delayed_work);
 568         struct bat_priv *bat_priv;
 569
 570         bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
 571         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 572         hlist_del(&forw_packet->list);
 573         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 574
 575         if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
 576                 goto out;
 577
 578         send_packet(forw_packet);
 579
 580         /**
 581          * we have to have at least one packet in the queue
 582          * to determine the queues wake up time unless we are
 583          * shutting down
 584          */
 585         if (forw_packet->own)
 586                 schedule_own_packet(forw_packet->if_incoming);
 587
 588 out:
 589         /* don't count own packet */
 590         if (!forw_packet->own)
 591                 atomic_inc(&bat_priv->batman_queue_left);
 592
 593         forw_packet_free(forw_packet);
 594 }
 595
 596 void purge_outstanding_packets(struct bat_priv *bat_priv,
 597                                const struct hard_iface *hard_iface)
 598 {
 599         struct forw_packet *forw_packet;
 600         struct hlist_node *tmp_node, *safe_tmp_node;
 601         bool pending;
 602
 603         if (hard_iface)
 604                 bat_dbg(DBG_BATMAN, bat_priv,
 605                         "purge_outstanding_packets(): %s\n",
 606                         hard_iface->net_dev->name);
 607         else
 608                 bat_dbg(DBG_BATMAN, bat_priv,
 609                         "purge_outstanding_packets()\n");
 610
 611         /* free bcast list */
 612         spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 613         hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
 614                                   &bat_priv->forw_bcast_list, list) {
 615
 616                 /**
 617                  * if purge_outstanding_packets() was called with an argmument
 618                  * we delete only packets belonging to the given interface
 619                  */
 620                 if ((hard_iface) &&
 621                     (forw_packet->if_incoming != hard_iface))
 622                         continue;
 623
 624                 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 625
 626                 /**
 627                  * send_outstanding_bcast_packet() will lock the list to
 628                  * delete the item from the list
 629                  */
 630                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 631                 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
 632
 633                 if (pending) {
 634                         hlist_del(&forw_packet->list);
 635                         forw_packet_free(forw_packet);
 636                 }
 637         }
 638         spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
 639
 640         /* free batman packet list */
 641         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 642         hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
 643                                   &bat_priv->forw_bat_list, list) {
 644
 645                 /**
 646                  * if purge_outstanding_packets() was called with an argmument
 647                  * we delete only packets belonging to the given interface
 648                  */
 649                 if ((hard_iface) &&
 650                     (forw_packet->if_incoming != hard_iface))
 651                         continue;
 652
 653                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 654
 655                 /**
 656                  * send_outstanding_bat_packet() will lock the list to
 657                  * delete the item from the list
 658                  */
 659                 pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
 660                 spin_lock_bh(&bat_priv->forw_bat_list_lock);
 661
 662                 if (pending) {
 663                         hlist_del(&forw_packet->list);
 664                         forw_packet_free(forw_packet);
 665                 }
 666         }
 667         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 668 }