net/batman-adv/bat_iv_ogm.c

   1 /*
   2  * Copyright (C) 2007-2012 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 "translation-table.h"
  24 #include "ring_buffer.h"
  25 #include "originator.h"
  26 #include "routing.h"
  27 #include "gateway_common.h"
  28 #include "gateway_client.h"
  29 #include "hard-interface.h"
  30 #include "send.h"
  31 #include "bat_algo.h"
  32
  33 static void bat_iv_ogm_init(struct hard_iface *hard_iface)
  34 {
  35         struct batman_ogm_packet *batman_ogm_packet;
  36
  37         hard_iface->packet_len = BATMAN_OGM_LEN;
  38         hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
  39
  40         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  41         batman_ogm_packet->header.packet_type = BAT_OGM;
  42         batman_ogm_packet->header.version = COMPAT_VERSION;
  43         batman_ogm_packet->header.ttl = 2;
  44         batman_ogm_packet->flags = NO_FLAGS;
  45         batman_ogm_packet->tq = TQ_MAX_VALUE;
  46         batman_ogm_packet->tt_num_changes = 0;
  47         batman_ogm_packet->ttvn = 0;
  48 }
  49
  50 static void bat_iv_ogm_init_primary(struct hard_iface *hard_iface)
  51 {
  52         struct batman_ogm_packet *batman_ogm_packet;
  53
  54         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  55         batman_ogm_packet->flags = PRIMARIES_FIRST_HOP;
  56         batman_ogm_packet->header.ttl = TTL;
  57 }
  58
  59 static void bat_iv_ogm_update_mac(struct hard_iface *hard_iface)
  60 {
  61         struct batman_ogm_packet *batman_ogm_packet;
  62
  63         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  64         memcpy(batman_ogm_packet->orig,
  65                hard_iface->net_dev->dev_addr, ETH_ALEN);
  66         memcpy(batman_ogm_packet->prev_sender,
  67                hard_iface->net_dev->dev_addr, ETH_ALEN);
  68 }
  69
  70 /* when do we schedule our own ogm to be sent */
  71 static unsigned long bat_iv_ogm_emit_send_time(const struct bat_priv *bat_priv)
  72 {
  73         return jiffies + msecs_to_jiffies(
  74                    atomic_read(&bat_priv->orig_interval) -
  75                    JITTER + (random32() % 2*JITTER));
  76 }
  77
  78 /* when do we schedule a ogm packet to be sent */
  79 static unsigned long bat_iv_ogm_fwd_send_time(void)
  80 {
  81         return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
  82 }
  83
  84 /* apply hop penalty for a normal link */
  85 static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
  86 {
  87         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
  88         return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
  89 }
  90
  91 /* is there another aggregated packet here? */
  92 static int bat_iv_ogm_aggr_packet(int buff_pos, int packet_len,
  93                                   int tt_num_changes)
  94 {
  95         int next_buff_pos = buff_pos + BATMAN_OGM_LEN + tt_len(tt_num_changes);
  96
  97         return (next_buff_pos <= packet_len) &&
  98                 (next_buff_pos <= MAX_AGGREGATION_BYTES);
  99 }
 100
 101 /* send a batman ogm to a given interface */
 102 static void bat_iv_ogm_send_to_if(struct forw_packet *forw_packet,
 103                                   struct hard_iface *hard_iface)
 104 {
 105         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 106         char *fwd_str;
 107         uint8_t packet_num;
 108         int16_t buff_pos;
 109         struct batman_ogm_packet *batman_ogm_packet;
 110         struct sk_buff *skb;
 111
 112         if (hard_iface->if_status != IF_ACTIVE)
 113                 return;
 114
 115         packet_num = 0;
 116         buff_pos = 0;
 117         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 118
 119         /* adjust all flags and log packets */
 120         while (bat_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 121                                       batman_ogm_packet->tt_num_changes)) {
 122
 123                 /* we might have aggregated direct link packets with an
 124                  * ordinary base packet */
 125                 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
 126                     (forw_packet->if_incoming == hard_iface))
 127                         batman_ogm_packet->flags |= DIRECTLINK;
 128                 else
 129                         batman_ogm_packet->flags &= ~DIRECTLINK;
 130
 131                 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
 132                                                             "Sending own" :
 133                                                             "Forwarding"));
 134                 bat_dbg(DBG_BATMAN, bat_priv,
 135                         "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
 136                         fwd_str, (packet_num > 0 ? "aggregated " : ""),
 137                         batman_ogm_packet->orig,
 138                         ntohl(batman_ogm_packet->seqno),
 139                         batman_ogm_packet->tq, batman_ogm_packet->header.ttl,
 140                         (batman_ogm_packet->flags & DIRECTLINK ?
 141                          "on" : "off"),
 142                         batman_ogm_packet->ttvn, hard_iface->net_dev->name,
 143                         hard_iface->net_dev->dev_addr);
 144
 145                 buff_pos += BATMAN_OGM_LEN +
 146                                 tt_len(batman_ogm_packet->tt_num_changes);
 147                 packet_num++;
 148                 batman_ogm_packet = (struct batman_ogm_packet *)
 149                                         (forw_packet->skb->data + buff_pos);
 150         }
 151
 152         /* create clone because function is called more than once */
 153         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 154         if (skb)
 155                 send_skb_packet(skb, hard_iface, broadcast_addr);
 156 }
 157
 158 /* send a batman ogm packet */
 159 static void bat_iv_ogm_emit(struct forw_packet *forw_packet)
 160 {
 161         struct hard_iface *hard_iface;
 162         struct net_device *soft_iface;
 163         struct bat_priv *bat_priv;
 164         struct hard_iface *primary_if = NULL;
 165         struct batman_ogm_packet *batman_ogm_packet;
 166         unsigned char directlink;
 167
 168         batman_ogm_packet = (struct batman_ogm_packet *)
 169                                                 (forw_packet->skb->data);
 170         directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 171
 172         if (!forw_packet->if_incoming) {
 173                 pr_err("Error - can't forward packet: incoming iface not 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_ogm_packet->header.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) on interface %s [%pM]\n",
 195                         (forw_packet->own ? "Sending own" : "Forwarding"),
 196                         batman_ogm_packet->orig,
 197                         ntohl(batman_ogm_packet->seqno),
 198                         batman_ogm_packet->header.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                 bat_iv_ogm_send_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 /* return true if new_packet can be aggregated with forw_packet */
 226 static bool bat_iv_ogm_can_aggregate(const struct batman_ogm_packet
 227                                                         *new_batman_ogm_packet,
 228                                      struct bat_priv *bat_priv,
 229                                      int packet_len, unsigned long send_time,
 230                                      bool directlink,
 231                                      const struct hard_iface *if_incoming,
 232                                      const struct forw_packet *forw_packet)
 233 {
 234         struct batman_ogm_packet *batman_ogm_packet;
 235         int aggregated_bytes = forw_packet->packet_len + packet_len;
 236         struct hard_iface *primary_if = NULL;
 237         bool res = false;
 238
 239         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 240
 241         /**
 242          * we can aggregate the current packet to this aggregated packet
 243          * if:
 244          *
 245          * - the send time is within our MAX_AGGREGATION_MS time
 246          * - the resulting packet wont be bigger than
 247          *   MAX_AGGREGATION_BYTES
 248          */
 249
 250         if (time_before(send_time, forw_packet->send_time) &&
 251             time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
 252                                         forw_packet->send_time) &&
 253             (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
 254
 255                 /**
 256                  * check aggregation compatibility
 257                  * -> direct link packets are broadcasted on
 258                  *    their interface only
 259                  * -> aggregate packet if the current packet is
 260                  *    a "global" packet as well as the base
 261                  *    packet
 262                  */
 263
 264                 primary_if = primary_if_get_selected(bat_priv);
 265                 if (!primary_if)
 266                         goto out;
 267
 268                 /* packets without direct link flag and high TTL
 269                  * are flooded through the net  */
 270                 if ((!directlink) &&
 271                     (!(batman_ogm_packet->flags & DIRECTLINK)) &&
 272                     (batman_ogm_packet->header.ttl != 1) &&
 273
 274                     /* own packets originating non-primary
 275                      * interfaces leave only that interface */
 276                     ((!forw_packet->own) ||
 277                      (forw_packet->if_incoming == primary_if))) {
 278                         res = true;
 279                         goto out;
 280                 }
 281
 282                 /* if the incoming packet is sent via this one
 283                  * interface only - we still can aggregate */
 284                 if ((directlink) &&
 285                     (new_batman_ogm_packet->header.ttl == 1) &&
 286                     (forw_packet->if_incoming == if_incoming) &&
 287
 288                     /* packets from direct neighbors or
 289                      * own secondary interface packets
 290                      * (= secondary interface packets in general) */
 291                     (batman_ogm_packet->flags & DIRECTLINK ||
 292                      (forw_packet->own &&
 293                       forw_packet->if_incoming != primary_if))) {
 294                         res = true;
 295                         goto out;
 296                 }
 297         }
 298
 299 out:
 300         if (primary_if)
 301                 hardif_free_ref(primary_if);
 302         return res;
 303 }
 304
 305 /* create a new aggregated packet and add this packet to it */
 306 static void bat_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 307                                      int packet_len, unsigned long send_time,
 308                                      bool direct_link,
 309                                      struct hard_iface *if_incoming,
 310                                      int own_packet)
 311 {
 312         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 313         struct forw_packet *forw_packet_aggr;
 314         unsigned char *skb_buff;
 315
 316         if (!atomic_inc_not_zero(&if_incoming->refcount))
 317                 return;
 318
 319         /* own packet should always be scheduled */
 320         if (!own_packet) {
 321                 if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 322                         bat_dbg(DBG_BATMAN, bat_priv,
 323                                 "batman packet queue full\n");
 324                         goto out;
 325                 }
 326         }
 327
 328         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 329         if (!forw_packet_aggr) {
 330                 if (!own_packet)
 331                         atomic_inc(&bat_priv->batman_queue_left);
 332                 goto out;
 333         }
 334
 335         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 336             (packet_len < MAX_AGGREGATION_BYTES))
 337                 forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
 338                                                       sizeof(struct ethhdr));
 339         else
 340                 forw_packet_aggr->skb = dev_alloc_skb(packet_len +
 341                                                       sizeof(struct ethhdr));
 342
 343         if (!forw_packet_aggr->skb) {
 344                 if (!own_packet)
 345                         atomic_inc(&bat_priv->batman_queue_left);
 346                 kfree(forw_packet_aggr);
 347                 goto out;
 348         }
 349         skb_reserve(forw_packet_aggr->skb, sizeof(struct ethhdr));
 350
 351         INIT_HLIST_NODE(&forw_packet_aggr->list);
 352
 353         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 354         forw_packet_aggr->packet_len = packet_len;
 355         memcpy(skb_buff, packet_buff, packet_len);
 356
 357         forw_packet_aggr->own = own_packet;
 358         forw_packet_aggr->if_incoming = if_incoming;
 359         forw_packet_aggr->num_packets = 0;
 360         forw_packet_aggr->direct_link_flags = NO_FLAGS;
 361         forw_packet_aggr->send_time = send_time;
 362
 363         /* save packet direct link flag status */
 364         if (direct_link)
 365                 forw_packet_aggr->direct_link_flags |= 1;
 366
 367         /* add new packet to packet list */
 368         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 369         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 370         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 371
 372         /* start timer for this packet */
 373         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 374                           send_outstanding_bat_ogm_packet);
 375         queue_delayed_work(bat_event_workqueue,
 376                            &forw_packet_aggr->delayed_work,
 377                            send_time - jiffies);
 378
 379         return;
 380 out:
 381         hardif_free_ref(if_incoming);
 382 }
 383
 384 /* aggregate a new packet into the existing ogm packet */
 385 static void bat_iv_ogm_aggregate(struct forw_packet *forw_packet_aggr,
 386                                  const unsigned char *packet_buff,
 387                                  int packet_len, bool direct_link)
 388 {
 389         unsigned char *skb_buff;
 390
 391         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 392         memcpy(skb_buff, packet_buff, packet_len);
 393         forw_packet_aggr->packet_len += packet_len;
 394         forw_packet_aggr->num_packets++;
 395
 396         /* save packet direct link flag status */
 397         if (direct_link)
 398                 forw_packet_aggr->direct_link_flags |=
 399                         (1 << forw_packet_aggr->num_packets);
 400 }
 401
 402 static void bat_iv_ogm_queue_add(struct bat_priv *bat_priv,
 403                                  unsigned char *packet_buff,
 404                                  int packet_len, struct hard_iface *if_incoming,
 405                                  int own_packet, unsigned long send_time)
 406 {
 407         /**
 408          * _aggr -> pointer to the packet we want to aggregate with
 409          * _pos -> pointer to the position in the queue
 410          */
 411         struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
 412         struct hlist_node *tmp_node;
 413         struct batman_ogm_packet *batman_ogm_packet;
 414         bool direct_link;
 415
 416         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
 417         direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0;
 418
 419         /* find position for the packet in the forward queue */
 420         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 421         /* own packets are not to be aggregated */
 422         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 423                 hlist_for_each_entry(forw_packet_pos, tmp_node,
 424                                      &bat_priv->forw_bat_list, list) {
 425                         if (bat_iv_ogm_can_aggregate(batman_ogm_packet,
 426                                                      bat_priv, packet_len,
 427                                                      send_time, direct_link,
 428                                                      if_incoming,
 429                                                      forw_packet_pos)) {
 430                                 forw_packet_aggr = forw_packet_pos;
 431                                 break;
 432                         }
 433                 }
 434         }
 435
 436         /* nothing to aggregate with - either aggregation disabled or no
 437          * suitable aggregation packet found */
 438         if (!forw_packet_aggr) {
 439                 /* the following section can run without the lock */
 440                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 441
 442                 /**
 443                  * if we could not aggregate this packet with one of the others
 444                  * we hold it back for a while, so that it might be aggregated
 445                  * later on
 446                  */
 447                 if ((!own_packet) &&
 448                     (atomic_read(&bat_priv->aggregated_ogms)))
 449                         send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
 450
 451                 bat_iv_ogm_aggregate_new(packet_buff, packet_len,
 452                                          send_time, direct_link,
 453                                          if_incoming, own_packet);
 454         } else {
 455                 bat_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 456                                      packet_len, direct_link);
 457                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 458         }
 459 }
 460
 461 static void bat_iv_ogm_forward(struct orig_node *orig_node,
 462                                const struct ethhdr *ethhdr,
 463                                struct batman_ogm_packet *batman_ogm_packet,
 464                                int directlink, struct hard_iface *if_incoming)
 465 {
 466         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 467         struct neigh_node *router;
 468         uint8_t in_tq, in_ttl, tq_avg = 0;
 469         uint8_t tt_num_changes;
 470
 471         if (batman_ogm_packet->header.ttl <= 1) {
 472                 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
 473                 return;
 474         }
 475
 476         router = orig_node_get_router(orig_node);
 477
 478         in_tq = batman_ogm_packet->tq;
 479         in_ttl = batman_ogm_packet->header.ttl;
 480         tt_num_changes = batman_ogm_packet->tt_num_changes;
 481
 482         batman_ogm_packet->header.ttl--;
 483         memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 484
 485         /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
 486          * of our best tq value */
 487         if (router && router->tq_avg != 0) {
 488
 489                 /* rebroadcast ogm of best ranking neighbor as is */
 490                 if (!compare_eth(router->addr, ethhdr->h_source)) {
 491                         batman_ogm_packet->tq = router->tq_avg;
 492
 493                         if (router->last_ttl)
 494                                 batman_ogm_packet->header.ttl =
 495                                         router->last_ttl - 1;
 496                 }
 497
 498                 tq_avg = router->tq_avg;
 499         }
 500
 501         if (router)
 502                 neigh_node_free_ref(router);
 503
 504         /* apply hop penalty */
 505         batman_ogm_packet->tq = hop_penalty(batman_ogm_packet->tq, bat_priv);
 506
 507         bat_dbg(DBG_BATMAN, bat_priv,
 508                 "Forwarding packet: tq_orig: %i, tq_avg: %i, tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
 509                 in_tq, tq_avg, batman_ogm_packet->tq, in_ttl - 1,
 510                 batman_ogm_packet->header.ttl);
 511
 512         batman_ogm_packet->seqno = htonl(batman_ogm_packet->seqno);
 513         batman_ogm_packet->tt_crc = htons(batman_ogm_packet->tt_crc);
 514
 515         /* switch of primaries first hop flag when forwarding */
 516         batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP;
 517         if (directlink)
 518                 batman_ogm_packet->flags |= DIRECTLINK;
 519         else
 520                 batman_ogm_packet->flags &= ~DIRECTLINK;
 521
 522         bat_iv_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet,
 523                              BATMAN_OGM_LEN + tt_len(tt_num_changes),
 524                              if_incoming, 0, bat_iv_ogm_fwd_send_time());
 525 }
 526
 527 static void bat_iv_ogm_schedule(struct hard_iface *hard_iface,
 528                                 int tt_num_changes)
 529 {
 530         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 531         struct batman_ogm_packet *batman_ogm_packet;
 532         struct hard_iface *primary_if;
 533         int vis_server;
 534
 535         vis_server = atomic_read(&bat_priv->vis_mode);
 536         primary_if = primary_if_get_selected(bat_priv);
 537
 538         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
 539
 540         /* change sequence number to network order */
 541         batman_ogm_packet->seqno =
 542                         htonl((uint32_t)atomic_read(&hard_iface->seqno));
 543
 544         batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn);
 545         batman_ogm_packet->tt_crc = htons((uint16_t)
 546                                                 atomic_read(&bat_priv->tt_crc));
 547         if (tt_num_changes >= 0)
 548                 batman_ogm_packet->tt_num_changes = tt_num_changes;
 549
 550         if (vis_server == VIS_TYPE_SERVER_SYNC)
 551                 batman_ogm_packet->flags |= VIS_SERVER;
 552         else
 553                 batman_ogm_packet->flags &= ~VIS_SERVER;
 554
 555         if ((hard_iface == primary_if) &&
 556             (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
 557                 batman_ogm_packet->gw_flags =
 558                                 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 559         else
 560                 batman_ogm_packet->gw_flags = NO_FLAGS;
 561
 562         atomic_inc(&hard_iface->seqno);
 563
 564         slide_own_bcast_window(hard_iface);
 565         bat_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff,
 566                              hard_iface->packet_len, hard_iface, 1,
 567                              bat_iv_ogm_emit_send_time(bat_priv));
 568
 569         if (primary_if)
 570                 hardif_free_ref(primary_if);
 571 }
 572
 573 static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv,
 574                                    struct orig_node *orig_node,
 575                                    const struct ethhdr *ethhdr,
 576                                    const struct batman_ogm_packet
 577                                                         *batman_ogm_packet,
 578                                    struct hard_iface *if_incoming,
 579                                    const unsigned char *tt_buff,
 580                                    int is_duplicate)
 581 {
 582         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 583         struct neigh_node *router = NULL;
 584         struct orig_node *orig_node_tmp;
 585         struct hlist_node *node;
 586         uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
 587
 588         bat_dbg(DBG_BATMAN, bat_priv,
 589                 "update_originator(): Searching and updating originator entry of received packet\n");
 590
 591         rcu_read_lock();
 592         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 593                                  &orig_node->neigh_list, list) {
 594                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 595                     (tmp_neigh_node->if_incoming == if_incoming) &&
 596                      atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 597                         if (neigh_node)
 598                                 neigh_node_free_ref(neigh_node);
 599                         neigh_node = tmp_neigh_node;
 600                         continue;
 601                 }
 602
 603                 if (is_duplicate)
 604                         continue;
 605
 606                 spin_lock_bh(&tmp_neigh_node->tq_lock);
 607                 ring_buffer_set(tmp_neigh_node->tq_recv,
 608                                 &tmp_neigh_node->tq_index, 0);
 609                 tmp_neigh_node->tq_avg =
 610                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 611                 spin_unlock_bh(&tmp_neigh_node->tq_lock);
 612         }
 613
 614         if (!neigh_node) {
 615                 struct orig_node *orig_tmp;
 616
 617                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 618                 if (!orig_tmp)
 619                         goto unlock;
 620
 621                 neigh_node = create_neighbor(orig_node, orig_tmp,
 622                                              ethhdr->h_source, if_incoming);
 623
 624                 orig_node_free_ref(orig_tmp);
 625                 if (!neigh_node)
 626                         goto unlock;
 627         } else
 628                 bat_dbg(DBG_BATMAN, bat_priv,
 629                         "Updating existing last-hop neighbor of originator\n");
 630
 631         rcu_read_unlock();
 632
 633         orig_node->flags = batman_ogm_packet->flags;
 634         neigh_node->last_valid = jiffies;
 635
 636         spin_lock_bh(&neigh_node->tq_lock);
 637         ring_buffer_set(neigh_node->tq_recv,
 638                         &neigh_node->tq_index,
 639                         batman_ogm_packet->tq);
 640         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 641         spin_unlock_bh(&neigh_node->tq_lock);
 642
 643         if (!is_duplicate) {
 644                 orig_node->last_ttl = batman_ogm_packet->header.ttl;
 645                 neigh_node->last_ttl = batman_ogm_packet->header.ttl;
 646         }
 647
 648         bonding_candidate_add(orig_node, neigh_node);
 649
 650         /* if this neighbor already is our next hop there is nothing
 651          * to change */
 652         router = orig_node_get_router(orig_node);
 653         if (router == neigh_node)
 654                 goto update_tt;
 655
 656         /* if this neighbor does not offer a better TQ we won't consider it */
 657         if (router && (router->tq_avg > neigh_node->tq_avg))
 658                 goto update_tt;
 659
 660         /* if the TQ is the same and the link not more symmetric we
 661          * won't consider it either */
 662         if (router && (neigh_node->tq_avg == router->tq_avg)) {
 663                 orig_node_tmp = router->orig_node;
 664                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 665                 bcast_own_sum_orig =
 666                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 667                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 668
 669                 orig_node_tmp = neigh_node->orig_node;
 670                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 671                 bcast_own_sum_neigh =
 672                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 673                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 674
 675                 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
 676                         goto update_tt;
 677         }
 678
 679         update_route(bat_priv, orig_node, neigh_node);
 680
 681 update_tt:
 682         /* I have to check for transtable changes only if the OGM has been
 683          * sent through a primary interface */
 684         if (((batman_ogm_packet->orig != ethhdr->h_source) &&
 685              (batman_ogm_packet->header.ttl > 2)) ||
 686             (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
 687                 tt_update_orig(bat_priv, orig_node, tt_buff,
 688                                batman_ogm_packet->tt_num_changes,
 689                                batman_ogm_packet->ttvn,
 690                                batman_ogm_packet->tt_crc);
 691
 692         if (orig_node->gw_flags != batman_ogm_packet->gw_flags)
 693                 gw_node_update(bat_priv, orig_node,
 694                                batman_ogm_packet->gw_flags);
 695
 696         orig_node->gw_flags = batman_ogm_packet->gw_flags;
 697
 698         /* restart gateway selection if fast or late switching was enabled */
 699         if ((orig_node->gw_flags) &&
 700             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 701             (atomic_read(&bat_priv->gw_sel_class) > 2))
 702                 gw_check_election(bat_priv, orig_node);
 703
 704         goto out;
 705
 706 unlock:
 707         rcu_read_unlock();
 708 out:
 709         if (neigh_node)
 710                 neigh_node_free_ref(neigh_node);
 711         if (router)
 712                 neigh_node_free_ref(router);
 713 }
 714
 715 static int bat_iv_ogm_calc_tq(struct orig_node *orig_node,
 716                               struct orig_node *orig_neigh_node,
 717                               struct batman_ogm_packet *batman_ogm_packet,
 718                               struct hard_iface *if_incoming)
 719 {
 720         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 721         struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
 722         struct hlist_node *node;
 723         uint8_t total_count;
 724         uint8_t orig_eq_count, neigh_rq_count, tq_own;
 725         int tq_asym_penalty, ret = 0;
 726
 727         /* find corresponding one hop neighbor */
 728         rcu_read_lock();
 729         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 730                                  &orig_neigh_node->neigh_list, list) {
 731
 732                 if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
 733                         continue;
 734
 735                 if (tmp_neigh_node->if_incoming != if_incoming)
 736                         continue;
 737
 738                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 739                         continue;
 740
 741                 neigh_node = tmp_neigh_node;
 742                 break;
 743         }
 744         rcu_read_unlock();
 745
 746         if (!neigh_node)
 747                 neigh_node = create_neighbor(orig_neigh_node,
 748                                              orig_neigh_node,
 749                                              orig_neigh_node->orig,
 750                                              if_incoming);
 751
 752         if (!neigh_node)
 753                 goto out;
 754
 755         /* if orig_node is direct neighbor update neigh_node last_valid */
 756         if (orig_node == orig_neigh_node)
 757                 neigh_node->last_valid = jiffies;
 758
 759         orig_node->last_valid = jiffies;
 760
 761         /* find packet count of corresponding one hop neighbor */
 762         spin_lock_bh(&orig_node->ogm_cnt_lock);
 763         orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
 764         neigh_rq_count = neigh_node->real_packet_count;
 765         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 766
 767         /* pay attention to not get a value bigger than 100 % */
 768         total_count = (orig_eq_count > neigh_rq_count ?
 769                        neigh_rq_count : orig_eq_count);
 770
 771         /* if we have too few packets (too less data) we set tq_own to zero */
 772         /* if we receive too few packets it is not considered bidirectional */
 773         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 774             (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 775                 tq_own = 0;
 776         else
 777                 /* neigh_node->real_packet_count is never zero as we
 778                  * only purge old information when getting new
 779                  * information */
 780                 tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
 781
 782         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 783          * affect the nearly-symmetric links only a little, but
 784          * punishes asymmetric links more.  This will give a value
 785          * between 0 and TQ_MAX_VALUE
 786          */
 787         tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
 788                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 789                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 790                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
 791                                         (TQ_LOCAL_WINDOW_SIZE *
 792                                          TQ_LOCAL_WINDOW_SIZE *
 793                                          TQ_LOCAL_WINDOW_SIZE);
 794
 795         batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own
 796                                                         * tq_asym_penalty) /
 797                                                 (TQ_MAX_VALUE * TQ_MAX_VALUE));
 798
 799         bat_dbg(DBG_BATMAN, bat_priv,
 800                 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
 801                 orig_node->orig, orig_neigh_node->orig, total_count,
 802                 neigh_rq_count, tq_own, tq_asym_penalty, batman_ogm_packet->tq);
 803
 804         /* if link has the minimum required transmission quality
 805          * consider it bidirectional */
 806         if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 807                 ret = 1;
 808
 809 out:
 810         if (neigh_node)
 811                 neigh_node_free_ref(neigh_node);
 812         return ret;
 813 }
 814
 815 /* processes a batman packet for all interfaces, adjusts the sequence number and
 816  * finds out whether it is a duplicate.
 817  * returns:
 818  *   1 the packet is a duplicate
 819  *   0 the packet has not yet been received
 820  *  -1 the packet is old and has been received while the seqno window
 821  *     was protected. Caller should drop it.
 822  */
 823 static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
 824                                     const struct batman_ogm_packet
 825                                                         *batman_ogm_packet,
 826                                     const struct hard_iface *if_incoming)
 827 {
 828         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 829         struct orig_node *orig_node;
 830         struct neigh_node *tmp_neigh_node;
 831         struct hlist_node *node;
 832         int is_duplicate = 0;
 833         int32_t seq_diff;
 834         int need_update = 0;
 835         int set_mark, ret = -1;
 836
 837         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
 838         if (!orig_node)
 839                 return 0;
 840
 841         spin_lock_bh(&orig_node->ogm_cnt_lock);
 842         seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;
 843
 844         /* signalize caller that the packet is to be dropped. */
 845         if (window_protected(bat_priv, seq_diff,
 846                              &orig_node->batman_seqno_reset))
 847                 goto out;
 848
 849         rcu_read_lock();
 850         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 851                                  &orig_node->neigh_list, list) {
 852
 853                 is_duplicate |= bat_test_bit(tmp_neigh_node->real_bits,
 854                                              orig_node->last_real_seqno,
 855                                              batman_ogm_packet->seqno);
 856
 857                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 858                     (tmp_neigh_node->if_incoming == if_incoming))
 859                         set_mark = 1;
 860                 else
 861                         set_mark = 0;
 862
 863                 /* if the window moved, set the update flag. */
 864                 need_update |= bit_get_packet(bat_priv,
 865                                               tmp_neigh_node->real_bits,
 866                                               seq_diff, set_mark);
 867
 868                 tmp_neigh_node->real_packet_count =
 869                         bitmap_weight(tmp_neigh_node->real_bits,
 870                                       TQ_LOCAL_WINDOW_SIZE);
 871         }
 872         rcu_read_unlock();
 873
 874         if (need_update) {
 875                 bat_dbg(DBG_BATMAN, bat_priv,
 876                         "updating last_seqno: old %d, new %d\n",
 877                         orig_node->last_real_seqno, batman_ogm_packet->seqno);
 878                 orig_node->last_real_seqno = batman_ogm_packet->seqno;
 879         }
 880
 881         ret = is_duplicate;
 882
 883 out:
 884         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 885         orig_node_free_ref(orig_node);
 886         return ret;
 887 }
 888
 889 static void bat_iv_ogm_process(const struct ethhdr *ethhdr,
 890                                struct batman_ogm_packet *batman_ogm_packet,
 891                                const unsigned char *tt_buff,
 892                                struct hard_iface *if_incoming)
 893 {
 894         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 895         struct hard_iface *hard_iface;
 896         struct orig_node *orig_neigh_node, *orig_node;
 897         struct neigh_node *router = NULL, *router_router = NULL;
 898         struct neigh_node *orig_neigh_router = NULL;
 899         int has_directlink_flag;
 900         int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 901         int is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 902         int is_duplicate;
 903         uint32_t if_incoming_seqno;
 904
 905         /* Silently drop when the batman packet is actually not a
 906          * correct packet.
 907          *
 908          * This might happen if a packet is padded (e.g. Ethernet has a
 909          * minimum frame length of 64 byte) and the aggregation interprets
 910          * it as an additional length.
 911          *
 912          * TODO: A more sane solution would be to have a bit in the
 913          * batman_ogm_packet to detect whether the packet is the last
 914          * packet in an aggregation.  Here we expect that the padding
 915          * is always zero (or not 0x01)
 916          */
 917         if (batman_ogm_packet->header.packet_type != BAT_OGM)
 918                 return;
 919
 920         /* could be changed by schedule_own_packet() */
 921         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 922
 923         has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 924
 925         is_single_hop_neigh = (compare_eth(ethhdr->h_source,
 926                                            batman_ogm_packet->orig) ? 1 : 0);
 927
 928         bat_dbg(DBG_BATMAN, bat_priv,
 929                 "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %d, ttvn %u, crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n",
 930                 ethhdr->h_source, if_incoming->net_dev->name,
 931                 if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,
 932                 batman_ogm_packet->prev_sender, batman_ogm_packet->seqno,
 933                 batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc,
 934                 batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,
 935                 batman_ogm_packet->header.ttl,
 936                 batman_ogm_packet->header.version, has_directlink_flag);
 937
 938         rcu_read_lock();
 939         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 940                 if (hard_iface->if_status != IF_ACTIVE)
 941                         continue;
 942
 943                 if (hard_iface->soft_iface != if_incoming->soft_iface)
 944                         continue;
 945
 946                 if (compare_eth(ethhdr->h_source,
 947                                 hard_iface->net_dev->dev_addr))
 948                         is_my_addr = 1;
 949
 950                 if (compare_eth(batman_ogm_packet->orig,
 951                                 hard_iface->net_dev->dev_addr))
 952                         is_my_orig = 1;
 953
 954                 if (compare_eth(batman_ogm_packet->prev_sender,
 955                                 hard_iface->net_dev->dev_addr))
 956                         is_my_oldorig = 1;
 957
 958                 if (is_broadcast_ether_addr(ethhdr->h_source))
 959                         is_broadcast = 1;
 960         }
 961         rcu_read_unlock();
 962
 963         if (batman_ogm_packet->header.version != COMPAT_VERSION) {
 964                 bat_dbg(DBG_BATMAN, bat_priv,
 965                         "Drop packet: incompatible batman version (%i)\n",
 966                         batman_ogm_packet->header.version);
 967                 return;
 968         }
 969
 970         if (is_my_addr) {
 971                 bat_dbg(DBG_BATMAN, bat_priv,
 972                         "Drop packet: received my own broadcast (sender: %pM)\n",
 973                         ethhdr->h_source);
 974                 return;
 975         }
 976
 977         if (is_broadcast) {
 978                 bat_dbg(DBG_BATMAN, bat_priv,
 979                         "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
 980                         ethhdr->h_source);
 981                 return;
 982         }
 983
 984         if (is_my_orig) {
 985                 unsigned long *word;
 986                 int offset;
 987
 988                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
 989                 if (!orig_neigh_node)
 990                         return;
 991
 992                 /* neighbor has to indicate direct link and it has to
 993                  * come via the corresponding interface */
 994                 /* save packet seqno for bidirectional check */
 995                 if (has_directlink_flag &&
 996                     compare_eth(if_incoming->net_dev->dev_addr,
 997                                 batman_ogm_packet->orig)) {
 998                         offset = if_incoming->if_num * NUM_WORDS;
 999
1000                         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1001                         word = &(orig_neigh_node->bcast_own[offset]);
1002                         bat_set_bit(word,
1003                                     if_incoming_seqno -
1004                                                 batman_ogm_packet->seqno - 2);
1005                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
1006                                 bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE);
1007                         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1008                 }
1009
1010                 bat_dbg(DBG_BATMAN, bat_priv,
1011                         "Drop packet: originator packet from myself (via neighbor)\n");
1012                 orig_node_free_ref(orig_neigh_node);
1013                 return;
1014         }
1015
1016         if (is_my_oldorig) {
1017                 bat_dbg(DBG_BATMAN, bat_priv,
1018                         "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1019                         ethhdr->h_source);
1020                 return;
1021         }
1022
1023         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
1024         if (!orig_node)
1025                 return;
1026
1027         is_duplicate = bat_iv_ogm_update_seqnos(ethhdr, batman_ogm_packet,
1028                                                 if_incoming);
1029
1030         if (is_duplicate == -1) {
1031                 bat_dbg(DBG_BATMAN, bat_priv,
1032                         "Drop packet: packet within seqno protection time (sender: %pM)\n",
1033                         ethhdr->h_source);
1034                 goto out;
1035         }
1036
1037         if (batman_ogm_packet->tq == 0) {
1038                 bat_dbg(DBG_BATMAN, bat_priv,
1039                         "Drop packet: originator packet with tq equal 0\n");
1040                 goto out;
1041         }
1042
1043         router = orig_node_get_router(orig_node);
1044         if (router)
1045                 router_router = orig_node_get_router(router->orig_node);
1046
1047         /* avoid temporary routing loops */
1048         if (router && router_router &&
1049             (compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&
1050             !(compare_eth(batman_ogm_packet->orig,
1051                           batman_ogm_packet->prev_sender)) &&
1052             (compare_eth(router->addr, router_router->addr))) {
1053                 bat_dbg(DBG_BATMAN, bat_priv,
1054                         "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1055                         ethhdr->h_source);
1056                 goto out;
1057         }
1058
1059         /* if sender is a direct neighbor the sender mac equals
1060          * originator mac */
1061         orig_neigh_node = (is_single_hop_neigh ?
1062                            orig_node :
1063                            get_orig_node(bat_priv, ethhdr->h_source));
1064         if (!orig_neigh_node)
1065                 goto out;
1066
1067         orig_neigh_router = orig_node_get_router(orig_neigh_node);
1068
1069         /* drop packet if sender is not a direct neighbor and if we
1070          * don't route towards it */
1071         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1072                 bat_dbg(DBG_BATMAN, bat_priv,
1073                         "Drop packet: OGM via unknown neighbor!\n");
1074                 goto out_neigh;
1075         }
1076
1077         is_bidirectional = bat_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1078                                               batman_ogm_packet, if_incoming);
1079
1080         bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet);
1081
1082         /* update ranking if it is not a duplicate or has the same
1083          * seqno and similar ttl as the non-duplicate */
1084         if (is_bidirectional &&
1085             (!is_duplicate ||
1086              ((orig_node->last_real_seqno == batman_ogm_packet->seqno) &&
1087               (orig_node->last_ttl - 3 <= batman_ogm_packet->header.ttl))))
1088                 bat_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1089                                        batman_ogm_packet, if_incoming,
1090                                        tt_buff, is_duplicate);
1091
1092         /* is single hop (direct) neighbor */
1093         if (is_single_hop_neigh) {
1094
1095                 /* mark direct link on incoming interface */
1096                 bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1097                                    1, if_incoming);
1098
1099                 bat_dbg(DBG_BATMAN, bat_priv,
1100                         "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1101                 goto out_neigh;
1102         }
1103
1104         /* multihop originator */
1105         if (!is_bidirectional) {
1106                 bat_dbg(DBG_BATMAN, bat_priv,
1107                         "Drop packet: not received via bidirectional link\n");
1108                 goto out_neigh;
1109         }
1110
1111         if (is_duplicate) {
1112                 bat_dbg(DBG_BATMAN, bat_priv,
1113                         "Drop packet: duplicate packet received\n");
1114                 goto out_neigh;
1115         }
1116
1117         bat_dbg(DBG_BATMAN, bat_priv,
1118                 "Forwarding packet: rebroadcast originator packet\n");
1119         bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1120                            0, if_incoming);
1121
1122 out_neigh:
1123         if ((orig_neigh_node) && (!is_single_hop_neigh))
1124                 orig_node_free_ref(orig_neigh_node);
1125 out:
1126         if (router)
1127                 neigh_node_free_ref(router);
1128         if (router_router)
1129                 neigh_node_free_ref(router_router);
1130         if (orig_neigh_router)
1131                 neigh_node_free_ref(orig_neigh_router);
1132
1133         orig_node_free_ref(orig_node);
1134 }
1135
1136 static void bat_iv_ogm_receive(struct hard_iface *if_incoming,
1137                                struct sk_buff *skb)
1138 {
1139         struct batman_ogm_packet *batman_ogm_packet;
1140         struct ethhdr *ethhdr;
1141         int buff_pos = 0, packet_len;
1142         unsigned char *tt_buff, *packet_buff;
1143
1144         packet_len = skb_headlen(skb);
1145         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1146         packet_buff = skb->data;
1147         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
1148
1149         /* unpack the aggregated packets and process them one by one */
1150         do {
1151                 /* network to host order for our 32bit seqno and the
1152                    orig_interval */
1153                 batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);
1154                 batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);
1155
1156                 tt_buff = packet_buff + buff_pos + BATMAN_OGM_LEN;
1157
1158                 bat_iv_ogm_process(ethhdr, batman_ogm_packet,
1159                                    tt_buff, if_incoming);
1160
1161                 buff_pos += BATMAN_OGM_LEN +
1162                                 tt_len(batman_ogm_packet->tt_num_changes);
1163
1164                 batman_ogm_packet = (struct batman_ogm_packet *)
1165                                                 (packet_buff + buff_pos);
1166         } while (bat_iv_ogm_aggr_packet(buff_pos, packet_len,
1167                                         batman_ogm_packet->tt_num_changes));
1168 }
1169
1170 static struct bat_algo_ops batman_iv __read_mostly = {
1171         .name = "BATMAN IV",
1172         .bat_ogm_init = bat_iv_ogm_init,
1173         .bat_ogm_init_primary = bat_iv_ogm_init_primary,
1174         .bat_ogm_update_mac = bat_iv_ogm_update_mac,
1175         .bat_ogm_schedule = bat_iv_ogm_schedule,
1176         .bat_ogm_emit = bat_iv_ogm_emit,
1177         .bat_ogm_receive = bat_iv_ogm_receive,
1178 };
1179
1180 int __init bat_iv_init(void)
1181 {
1182         return bat_algo_register(&batman_iv);
1183 }