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_iface_enable(struct hard_iface *hard_iface)
  34 {
  35         struct batman_ogm_packet *batman_ogm_packet;
  36         uint32_t random_seqno;
  37
  38         /* randomize initial seqno to avoid collision */
  39         get_random_bytes(&random_seqno, sizeof(random_seqno));
  40         atomic_set(&hard_iface->seqno, random_seqno);
  41
  42         hard_iface->packet_len = BATMAN_OGM_LEN;
  43         hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
  44
  45         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  46         batman_ogm_packet->header.packet_type = BAT_OGM;
  47         batman_ogm_packet->header.version = COMPAT_VERSION;
  48         batman_ogm_packet->header.ttl = 2;
  49         batman_ogm_packet->flags = NO_FLAGS;
  50         batman_ogm_packet->tq = TQ_MAX_VALUE;
  51         batman_ogm_packet->tt_num_changes = 0;
  52         batman_ogm_packet->ttvn = 0;
  53 }
  54
  55 static void bat_iv_ogm_iface_disable(struct hard_iface *hard_iface)
  56 {
  57         kfree(hard_iface->packet_buff);
  58         hard_iface->packet_buff = NULL;
  59 }
  60
  61 static void bat_iv_ogm_init_primary(struct hard_iface *hard_iface)
  62 {
  63         struct batman_ogm_packet *batman_ogm_packet;
  64
  65         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  66         batman_ogm_packet->flags = PRIMARIES_FIRST_HOP;
  67         batman_ogm_packet->header.ttl = TTL;
  68 }
  69
  70 static void bat_iv_ogm_update_mac(struct hard_iface *hard_iface)
  71 {
  72         struct batman_ogm_packet *batman_ogm_packet;
  73
  74         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  75         memcpy(batman_ogm_packet->orig,
  76                hard_iface->net_dev->dev_addr, ETH_ALEN);
  77         memcpy(batman_ogm_packet->prev_sender,
  78                hard_iface->net_dev->dev_addr, ETH_ALEN);
  79 }
  80
  81 /* when do we schedule our own ogm to be sent */
  82 static unsigned long bat_iv_ogm_emit_send_time(const struct bat_priv *bat_priv)
  83 {
  84         return jiffies + msecs_to_jiffies(
  85                    atomic_read(&bat_priv->orig_interval) -
  86                    JITTER + (random32() % 2*JITTER));
  87 }
  88
  89 /* when do we schedule a ogm packet to be sent */
  90 static unsigned long bat_iv_ogm_fwd_send_time(void)
  91 {
  92         return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
  93 }
  94
  95 /* apply hop penalty for a normal link */
  96 static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
  97 {
  98         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
  99         return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
 100 }
 101
 102 /* is there another aggregated packet here? */
 103 static int bat_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 104                                   int tt_num_changes)
 105 {
 106         int next_buff_pos = buff_pos + BATMAN_OGM_LEN + tt_len(tt_num_changes);
 107
 108         return (next_buff_pos <= packet_len) &&
 109                 (next_buff_pos <= MAX_AGGREGATION_BYTES);
 110 }
 111
 112 /* send a batman ogm to a given interface */
 113 static void bat_iv_ogm_send_to_if(struct forw_packet *forw_packet,
 114                                   struct hard_iface *hard_iface)
 115 {
 116         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 117         char *fwd_str;
 118         uint8_t packet_num;
 119         int16_t buff_pos;
 120         struct batman_ogm_packet *batman_ogm_packet;
 121         struct sk_buff *skb;
 122
 123         if (hard_iface->if_status != IF_ACTIVE)
 124                 return;
 125
 126         packet_num = 0;
 127         buff_pos = 0;
 128         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 129
 130         /* adjust all flags and log packets */
 131         while (bat_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 132                                       batman_ogm_packet->tt_num_changes)) {
 133
 134                 /* we might have aggregated direct link packets with an
 135                  * ordinary base packet */
 136                 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
 137                     (forw_packet->if_incoming == hard_iface))
 138                         batman_ogm_packet->flags |= DIRECTLINK;
 139                 else
 140                         batman_ogm_packet->flags &= ~DIRECTLINK;
 141
 142                 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
 143                                                             "Sending own" :
 144                                                             "Forwarding"));
 145                 bat_dbg(DBG_BATMAN, bat_priv,
 146                         "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
 147                         fwd_str, (packet_num > 0 ? "aggregated " : ""),
 148                         batman_ogm_packet->orig,
 149                         ntohl(batman_ogm_packet->seqno),
 150                         batman_ogm_packet->tq, batman_ogm_packet->header.ttl,
 151                         (batman_ogm_packet->flags & DIRECTLINK ?
 152                          "on" : "off"),
 153                         batman_ogm_packet->ttvn, hard_iface->net_dev->name,
 154                         hard_iface->net_dev->dev_addr);
 155
 156                 buff_pos += BATMAN_OGM_LEN +
 157                                 tt_len(batman_ogm_packet->tt_num_changes);
 158                 packet_num++;
 159                 batman_ogm_packet = (struct batman_ogm_packet *)
 160                                         (forw_packet->skb->data + buff_pos);
 161         }
 162
 163         /* create clone because function is called more than once */
 164         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 165         if (skb)
 166                 send_skb_packet(skb, hard_iface, broadcast_addr);
 167 }
 168
 169 /* send a batman ogm packet */
 170 static void bat_iv_ogm_emit(struct forw_packet *forw_packet)
 171 {
 172         struct hard_iface *hard_iface;
 173         struct net_device *soft_iface;
 174         struct bat_priv *bat_priv;
 175         struct hard_iface *primary_if = NULL;
 176         struct batman_ogm_packet *batman_ogm_packet;
 177         unsigned char directlink;
 178
 179         batman_ogm_packet = (struct batman_ogm_packet *)
 180                                                 (forw_packet->skb->data);
 181         directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 182
 183         if (!forw_packet->if_incoming) {
 184                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 185                 goto out;
 186         }
 187
 188         soft_iface = forw_packet->if_incoming->soft_iface;
 189         bat_priv = netdev_priv(soft_iface);
 190
 191         if (forw_packet->if_incoming->if_status != IF_ACTIVE)
 192                 goto out;
 193
 194         primary_if = primary_if_get_selected(bat_priv);
 195         if (!primary_if)
 196                 goto out;
 197
 198         /* multihomed peer assumed */
 199         /* non-primary OGMs are only broadcasted on their interface */
 200         if ((directlink && (batman_ogm_packet->header.ttl == 1)) ||
 201             (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
 202
 203                 /* FIXME: what about aggregated packets ? */
 204                 bat_dbg(DBG_BATMAN, bat_priv,
 205                         "%s packet (originator %pM, seqno %d, TTL %d) on interface %s [%pM]\n",
 206                         (forw_packet->own ? "Sending own" : "Forwarding"),
 207                         batman_ogm_packet->orig,
 208                         ntohl(batman_ogm_packet->seqno),
 209                         batman_ogm_packet->header.ttl,
 210                         forw_packet->if_incoming->net_dev->name,
 211                         forw_packet->if_incoming->net_dev->dev_addr);
 212
 213                 /* skb is only used once and than forw_packet is free'd */
 214                 send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
 215                                 broadcast_addr);
 216                 forw_packet->skb = NULL;
 217
 218                 goto out;
 219         }
 220
 221         /* broadcast on every interface */
 222         rcu_read_lock();
 223         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 224                 if (hard_iface->soft_iface != soft_iface)
 225                         continue;
 226
 227                 bat_iv_ogm_send_to_if(forw_packet, hard_iface);
 228         }
 229         rcu_read_unlock();
 230
 231 out:
 232         if (primary_if)
 233                 hardif_free_ref(primary_if);
 234 }
 235
 236 /* return true if new_packet can be aggregated with forw_packet */
 237 static bool bat_iv_ogm_can_aggregate(const struct batman_ogm_packet
 238                                                         *new_batman_ogm_packet,
 239                                      struct bat_priv *bat_priv,
 240                                      int packet_len, unsigned long send_time,
 241                                      bool directlink,
 242                                      const struct hard_iface *if_incoming,
 243                                      const struct forw_packet *forw_packet)
 244 {
 245         struct batman_ogm_packet *batman_ogm_packet;
 246         int aggregated_bytes = forw_packet->packet_len + packet_len;
 247         struct hard_iface *primary_if = NULL;
 248         bool res = false;
 249
 250         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 251
 252         /**
 253          * we can aggregate the current packet to this aggregated packet
 254          * if:
 255          *
 256          * - the send time is within our MAX_AGGREGATION_MS time
 257          * - the resulting packet wont be bigger than
 258          *   MAX_AGGREGATION_BYTES
 259          */
 260
 261         if (time_before(send_time, forw_packet->send_time) &&
 262             time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
 263                                         forw_packet->send_time) &&
 264             (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
 265
 266                 /**
 267                  * check aggregation compatibility
 268                  * -> direct link packets are broadcasted on
 269                  *    their interface only
 270                  * -> aggregate packet if the current packet is
 271                  *    a "global" packet as well as the base
 272                  *    packet
 273                  */
 274
 275                 primary_if = primary_if_get_selected(bat_priv);
 276                 if (!primary_if)
 277                         goto out;
 278
 279                 /* packets without direct link flag and high TTL
 280                  * are flooded through the net  */
 281                 if ((!directlink) &&
 282                     (!(batman_ogm_packet->flags & DIRECTLINK)) &&
 283                     (batman_ogm_packet->header.ttl != 1) &&
 284
 285                     /* own packets originating non-primary
 286                      * interfaces leave only that interface */
 287                     ((!forw_packet->own) ||
 288                      (forw_packet->if_incoming == primary_if))) {
 289                         res = true;
 290                         goto out;
 291                 }
 292
 293                 /* if the incoming packet is sent via this one
 294                  * interface only - we still can aggregate */
 295                 if ((directlink) &&
 296                     (new_batman_ogm_packet->header.ttl == 1) &&
 297                     (forw_packet->if_incoming == if_incoming) &&
 298
 299                     /* packets from direct neighbors or
 300                      * own secondary interface packets
 301                      * (= secondary interface packets in general) */
 302                     (batman_ogm_packet->flags & DIRECTLINK ||
 303                      (forw_packet->own &&
 304                       forw_packet->if_incoming != primary_if))) {
 305                         res = true;
 306                         goto out;
 307                 }
 308         }
 309
 310 out:
 311         if (primary_if)
 312                 hardif_free_ref(primary_if);
 313         return res;
 314 }
 315
 316 /* create a new aggregated packet and add this packet to it */
 317 static void bat_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 318                                      int packet_len, unsigned long send_time,
 319                                      bool direct_link,
 320                                      struct hard_iface *if_incoming,
 321                                      int own_packet)
 322 {
 323         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 324         struct forw_packet *forw_packet_aggr;
 325         unsigned char *skb_buff;
 326
 327         if (!atomic_inc_not_zero(&if_incoming->refcount))
 328                 return;
 329
 330         /* own packet should always be scheduled */
 331         if (!own_packet) {
 332                 if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 333                         bat_dbg(DBG_BATMAN, bat_priv,
 334                                 "batman packet queue full\n");
 335                         goto out;
 336                 }
 337         }
 338
 339         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 340         if (!forw_packet_aggr) {
 341                 if (!own_packet)
 342                         atomic_inc(&bat_priv->batman_queue_left);
 343                 goto out;
 344         }
 345
 346         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 347             (packet_len < MAX_AGGREGATION_BYTES))
 348                 forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
 349                                                       sizeof(struct ethhdr));
 350         else
 351                 forw_packet_aggr->skb = dev_alloc_skb(packet_len +
 352                                                       sizeof(struct ethhdr));
 353
 354         if (!forw_packet_aggr->skb) {
 355                 if (!own_packet)
 356                         atomic_inc(&bat_priv->batman_queue_left);
 357                 kfree(forw_packet_aggr);
 358                 goto out;
 359         }
 360         skb_reserve(forw_packet_aggr->skb, sizeof(struct ethhdr));
 361
 362         INIT_HLIST_NODE(&forw_packet_aggr->list);
 363
 364         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 365         forw_packet_aggr->packet_len = packet_len;
 366         memcpy(skb_buff, packet_buff, packet_len);
 367
 368         forw_packet_aggr->own = own_packet;
 369         forw_packet_aggr->if_incoming = if_incoming;
 370         forw_packet_aggr->num_packets = 0;
 371         forw_packet_aggr->direct_link_flags = NO_FLAGS;
 372         forw_packet_aggr->send_time = send_time;
 373
 374         /* save packet direct link flag status */
 375         if (direct_link)
 376                 forw_packet_aggr->direct_link_flags |= 1;
 377
 378         /* add new packet to packet list */
 379         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 380         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 381         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 382
 383         /* start timer for this packet */
 384         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 385                           send_outstanding_bat_ogm_packet);
 386         queue_delayed_work(bat_event_workqueue,
 387                            &forw_packet_aggr->delayed_work,
 388                            send_time - jiffies);
 389
 390         return;
 391 out:
 392         hardif_free_ref(if_incoming);
 393 }
 394
 395 /* aggregate a new packet into the existing ogm packet */
 396 static void bat_iv_ogm_aggregate(struct forw_packet *forw_packet_aggr,
 397                                  const unsigned char *packet_buff,
 398                                  int packet_len, bool direct_link)
 399 {
 400         unsigned char *skb_buff;
 401
 402         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 403         memcpy(skb_buff, packet_buff, packet_len);
 404         forw_packet_aggr->packet_len += packet_len;
 405         forw_packet_aggr->num_packets++;
 406
 407         /* save packet direct link flag status */
 408         if (direct_link)
 409                 forw_packet_aggr->direct_link_flags |=
 410                         (1 << forw_packet_aggr->num_packets);
 411 }
 412
 413 static void bat_iv_ogm_queue_add(struct bat_priv *bat_priv,
 414                                  unsigned char *packet_buff,
 415                                  int packet_len, struct hard_iface *if_incoming,
 416                                  int own_packet, unsigned long send_time)
 417 {
 418         /**
 419          * _aggr -> pointer to the packet we want to aggregate with
 420          * _pos -> pointer to the position in the queue
 421          */
 422         struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
 423         struct hlist_node *tmp_node;
 424         struct batman_ogm_packet *batman_ogm_packet;
 425         bool direct_link;
 426
 427         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
 428         direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0;
 429
 430         /* find position for the packet in the forward queue */
 431         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 432         /* own packets are not to be aggregated */
 433         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 434                 hlist_for_each_entry(forw_packet_pos, tmp_node,
 435                                      &bat_priv->forw_bat_list, list) {
 436                         if (bat_iv_ogm_can_aggregate(batman_ogm_packet,
 437                                                      bat_priv, packet_len,
 438                                                      send_time, direct_link,
 439                                                      if_incoming,
 440                                                      forw_packet_pos)) {
 441                                 forw_packet_aggr = forw_packet_pos;
 442                                 break;
 443                         }
 444                 }
 445         }
 446
 447         /* nothing to aggregate with - either aggregation disabled or no
 448          * suitable aggregation packet found */
 449         if (!forw_packet_aggr) {
 450                 /* the following section can run without the lock */
 451                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 452
 453                 /**
 454                  * if we could not aggregate this packet with one of the others
 455                  * we hold it back for a while, so that it might be aggregated
 456                  * later on
 457                  */
 458                 if ((!own_packet) &&
 459                     (atomic_read(&bat_priv->aggregated_ogms)))
 460                         send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
 461
 462                 bat_iv_ogm_aggregate_new(packet_buff, packet_len,
 463                                          send_time, direct_link,
 464                                          if_incoming, own_packet);
 465         } else {
 466                 bat_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 467                                      packet_len, direct_link);
 468                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 469         }
 470 }
 471
 472 static void bat_iv_ogm_forward(struct orig_node *orig_node,
 473                                const struct ethhdr *ethhdr,
 474                                struct batman_ogm_packet *batman_ogm_packet,
 475                                int directlink, struct hard_iface *if_incoming)
 476 {
 477         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 478         struct neigh_node *router;
 479         uint8_t in_tq, in_ttl, tq_avg = 0;
 480         uint8_t tt_num_changes;
 481
 482         if (batman_ogm_packet->header.ttl <= 1) {
 483                 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
 484                 return;
 485         }
 486
 487         router = orig_node_get_router(orig_node);
 488
 489         in_tq = batman_ogm_packet->tq;
 490         in_ttl = batman_ogm_packet->header.ttl;
 491         tt_num_changes = batman_ogm_packet->tt_num_changes;
 492
 493         batman_ogm_packet->header.ttl--;
 494         memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 495
 496         /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
 497          * of our best tq value */
 498         if (router && router->tq_avg != 0) {
 499
 500                 /* rebroadcast ogm of best ranking neighbor as is */
 501                 if (!compare_eth(router->addr, ethhdr->h_source)) {
 502                         batman_ogm_packet->tq = router->tq_avg;
 503
 504                         if (router->last_ttl)
 505                                 batman_ogm_packet->header.ttl =
 506                                         router->last_ttl - 1;
 507                 }
 508
 509                 tq_avg = router->tq_avg;
 510         }
 511
 512         if (router)
 513                 neigh_node_free_ref(router);
 514
 515         /* apply hop penalty */
 516         batman_ogm_packet->tq = hop_penalty(batman_ogm_packet->tq, bat_priv);
 517
 518         bat_dbg(DBG_BATMAN, bat_priv,
 519                 "Forwarding packet: tq_orig: %i, tq_avg: %i, tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
 520                 in_tq, tq_avg, batman_ogm_packet->tq, in_ttl - 1,
 521                 batman_ogm_packet->header.ttl);
 522
 523         batman_ogm_packet->seqno = htonl(batman_ogm_packet->seqno);
 524         batman_ogm_packet->tt_crc = htons(batman_ogm_packet->tt_crc);
 525
 526         /* switch of primaries first hop flag when forwarding */
 527         batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP;
 528         if (directlink)
 529                 batman_ogm_packet->flags |= DIRECTLINK;
 530         else
 531                 batman_ogm_packet->flags &= ~DIRECTLINK;
 532
 533         bat_iv_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet,
 534                              BATMAN_OGM_LEN + tt_len(tt_num_changes),
 535                              if_incoming, 0, bat_iv_ogm_fwd_send_time());
 536 }
 537
 538 static void bat_iv_ogm_schedule(struct hard_iface *hard_iface,
 539                                 int tt_num_changes)
 540 {
 541         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 542         struct batman_ogm_packet *batman_ogm_packet;
 543         struct hard_iface *primary_if;
 544         int vis_server;
 545
 546         vis_server = atomic_read(&bat_priv->vis_mode);
 547         primary_if = primary_if_get_selected(bat_priv);
 548
 549         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
 550
 551         /* change sequence number to network order */
 552         batman_ogm_packet->seqno =
 553                         htonl((uint32_t)atomic_read(&hard_iface->seqno));
 554
 555         batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn);
 556         batman_ogm_packet->tt_crc = htons((uint16_t)
 557                                                 atomic_read(&bat_priv->tt_crc));
 558         if (tt_num_changes >= 0)
 559                 batman_ogm_packet->tt_num_changes = tt_num_changes;
 560
 561         if (vis_server == VIS_TYPE_SERVER_SYNC)
 562                 batman_ogm_packet->flags |= VIS_SERVER;
 563         else
 564                 batman_ogm_packet->flags &= ~VIS_SERVER;
 565
 566         if ((hard_iface == primary_if) &&
 567             (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
 568                 batman_ogm_packet->gw_flags =
 569                                 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 570         else
 571                 batman_ogm_packet->gw_flags = NO_FLAGS;
 572
 573         atomic_inc(&hard_iface->seqno);
 574
 575         slide_own_bcast_window(hard_iface);
 576         bat_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff,
 577                              hard_iface->packet_len, hard_iface, 1,
 578                              bat_iv_ogm_emit_send_time(bat_priv));
 579
 580         if (primary_if)
 581                 hardif_free_ref(primary_if);
 582 }
 583
 584 static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv,
 585                                    struct orig_node *orig_node,
 586                                    const struct ethhdr *ethhdr,
 587                                    const struct batman_ogm_packet
 588                                                         *batman_ogm_packet,
 589                                    struct hard_iface *if_incoming,
 590                                    const unsigned char *tt_buff,
 591                                    int is_duplicate)
 592 {
 593         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 594         struct neigh_node *router = NULL;
 595         struct orig_node *orig_node_tmp;
 596         struct hlist_node *node;
 597         uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
 598
 599         bat_dbg(DBG_BATMAN, bat_priv,
 600                 "update_originator(): Searching and updating originator entry of received packet\n");
 601
 602         rcu_read_lock();
 603         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 604                                  &orig_node->neigh_list, list) {
 605                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 606                     (tmp_neigh_node->if_incoming == if_incoming) &&
 607                      atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 608                         if (neigh_node)
 609                                 neigh_node_free_ref(neigh_node);
 610                         neigh_node = tmp_neigh_node;
 611                         continue;
 612                 }
 613
 614                 if (is_duplicate)
 615                         continue;
 616
 617                 spin_lock_bh(&tmp_neigh_node->tq_lock);
 618                 ring_buffer_set(tmp_neigh_node->tq_recv,
 619                                 &tmp_neigh_node->tq_index, 0);
 620                 tmp_neigh_node->tq_avg =
 621                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 622                 spin_unlock_bh(&tmp_neigh_node->tq_lock);
 623         }
 624
 625         if (!neigh_node) {
 626                 struct orig_node *orig_tmp;
 627
 628                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 629                 if (!orig_tmp)
 630                         goto unlock;
 631
 632                 neigh_node = create_neighbor(orig_node, orig_tmp,
 633                                              ethhdr->h_source, if_incoming);
 634
 635                 orig_node_free_ref(orig_tmp);
 636                 if (!neigh_node)
 637                         goto unlock;
 638         } else
 639                 bat_dbg(DBG_BATMAN, bat_priv,
 640                         "Updating existing last-hop neighbor of originator\n");
 641
 642         rcu_read_unlock();
 643
 644         orig_node->flags = batman_ogm_packet->flags;
 645         neigh_node->last_valid = jiffies;
 646
 647         spin_lock_bh(&neigh_node->tq_lock);
 648         ring_buffer_set(neigh_node->tq_recv,
 649                         &neigh_node->tq_index,
 650                         batman_ogm_packet->tq);
 651         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 652         spin_unlock_bh(&neigh_node->tq_lock);
 653
 654         if (!is_duplicate) {
 655                 orig_node->last_ttl = batman_ogm_packet->header.ttl;
 656                 neigh_node->last_ttl = batman_ogm_packet->header.ttl;
 657         }
 658
 659         bonding_candidate_add(orig_node, neigh_node);
 660
 661         /* if this neighbor already is our next hop there is nothing
 662          * to change */
 663         router = orig_node_get_router(orig_node);
 664         if (router == neigh_node)
 665                 goto update_tt;
 666
 667         /* if this neighbor does not offer a better TQ we won't consider it */
 668         if (router && (router->tq_avg > neigh_node->tq_avg))
 669                 goto update_tt;
 670
 671         /* if the TQ is the same and the link not more symmetric we
 672          * won't consider it either */
 673         if (router && (neigh_node->tq_avg == router->tq_avg)) {
 674                 orig_node_tmp = router->orig_node;
 675                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 676                 bcast_own_sum_orig =
 677                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 678                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 679
 680                 orig_node_tmp = neigh_node->orig_node;
 681                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 682                 bcast_own_sum_neigh =
 683                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 684                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 685
 686                 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
 687                         goto update_tt;
 688         }
 689
 690         update_route(bat_priv, orig_node, neigh_node);
 691
 692 update_tt:
 693         /* I have to check for transtable changes only if the OGM has been
 694          * sent through a primary interface */
 695         if (((batman_ogm_packet->orig != ethhdr->h_source) &&
 696              (batman_ogm_packet->header.ttl > 2)) ||
 697             (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
 698                 tt_update_orig(bat_priv, orig_node, tt_buff,
 699                                batman_ogm_packet->tt_num_changes,
 700                                batman_ogm_packet->ttvn,
 701                                batman_ogm_packet->tt_crc);
 702
 703         if (orig_node->gw_flags != batman_ogm_packet->gw_flags)
 704                 gw_node_update(bat_priv, orig_node,
 705                                batman_ogm_packet->gw_flags);
 706
 707         orig_node->gw_flags = batman_ogm_packet->gw_flags;
 708
 709         /* restart gateway selection if fast or late switching was enabled */
 710         if ((orig_node->gw_flags) &&
 711             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 712             (atomic_read(&bat_priv->gw_sel_class) > 2))
 713                 gw_check_election(bat_priv, orig_node);
 714
 715         goto out;
 716
 717 unlock:
 718         rcu_read_unlock();
 719 out:
 720         if (neigh_node)
 721                 neigh_node_free_ref(neigh_node);
 722         if (router)
 723                 neigh_node_free_ref(router);
 724 }
 725
 726 static int bat_iv_ogm_calc_tq(struct orig_node *orig_node,
 727                               struct orig_node *orig_neigh_node,
 728                               struct batman_ogm_packet *batman_ogm_packet,
 729                               struct hard_iface *if_incoming)
 730 {
 731         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 732         struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
 733         struct hlist_node *node;
 734         uint8_t total_count;
 735         uint8_t orig_eq_count, neigh_rq_count, tq_own;
 736         int tq_asym_penalty, ret = 0;
 737
 738         /* find corresponding one hop neighbor */
 739         rcu_read_lock();
 740         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 741                                  &orig_neigh_node->neigh_list, list) {
 742
 743                 if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
 744                         continue;
 745
 746                 if (tmp_neigh_node->if_incoming != if_incoming)
 747                         continue;
 748
 749                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 750                         continue;
 751
 752                 neigh_node = tmp_neigh_node;
 753                 break;
 754         }
 755         rcu_read_unlock();
 756
 757         if (!neigh_node)
 758                 neigh_node = create_neighbor(orig_neigh_node,
 759                                              orig_neigh_node,
 760                                              orig_neigh_node->orig,
 761                                              if_incoming);
 762
 763         if (!neigh_node)
 764                 goto out;
 765
 766         /* if orig_node is direct neighbor update neigh_node last_valid */
 767         if (orig_node == orig_neigh_node)
 768                 neigh_node->last_valid = jiffies;
 769
 770         orig_node->last_valid = jiffies;
 771
 772         /* find packet count of corresponding one hop neighbor */
 773         spin_lock_bh(&orig_node->ogm_cnt_lock);
 774         orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
 775         neigh_rq_count = neigh_node->real_packet_count;
 776         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 777
 778         /* pay attention to not get a value bigger than 100 % */
 779         total_count = (orig_eq_count > neigh_rq_count ?
 780                        neigh_rq_count : orig_eq_count);
 781
 782         /* if we have too few packets (too less data) we set tq_own to zero */
 783         /* if we receive too few packets it is not considered bidirectional */
 784         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 785             (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 786                 tq_own = 0;
 787         else
 788                 /* neigh_node->real_packet_count is never zero as we
 789                  * only purge old information when getting new
 790                  * information */
 791                 tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
 792
 793         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 794          * affect the nearly-symmetric links only a little, but
 795          * punishes asymmetric links more.  This will give a value
 796          * between 0 and TQ_MAX_VALUE
 797          */
 798         tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
 799                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 800                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 801                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
 802                                         (TQ_LOCAL_WINDOW_SIZE *
 803                                          TQ_LOCAL_WINDOW_SIZE *
 804                                          TQ_LOCAL_WINDOW_SIZE);
 805
 806         batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own
 807                                                         * tq_asym_penalty) /
 808                                                 (TQ_MAX_VALUE * TQ_MAX_VALUE));
 809
 810         bat_dbg(DBG_BATMAN, bat_priv,
 811                 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
 812                 orig_node->orig, orig_neigh_node->orig, total_count,
 813                 neigh_rq_count, tq_own, tq_asym_penalty, batman_ogm_packet->tq);
 814
 815         /* if link has the minimum required transmission quality
 816          * consider it bidirectional */
 817         if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 818                 ret = 1;
 819
 820 out:
 821         if (neigh_node)
 822                 neigh_node_free_ref(neigh_node);
 823         return ret;
 824 }
 825
 826 /* processes a batman packet for all interfaces, adjusts the sequence number and
 827  * finds out whether it is a duplicate.
 828  * returns:
 829  *   1 the packet is a duplicate
 830  *   0 the packet has not yet been received
 831  *  -1 the packet is old and has been received while the seqno window
 832  *     was protected. Caller should drop it.
 833  */
 834 static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
 835                                     const struct batman_ogm_packet
 836                                                         *batman_ogm_packet,
 837                                     const struct hard_iface *if_incoming)
 838 {
 839         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 840         struct orig_node *orig_node;
 841         struct neigh_node *tmp_neigh_node;
 842         struct hlist_node *node;
 843         int is_duplicate = 0;
 844         int32_t seq_diff;
 845         int need_update = 0;
 846         int set_mark, ret = -1;
 847
 848         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
 849         if (!orig_node)
 850                 return 0;
 851
 852         spin_lock_bh(&orig_node->ogm_cnt_lock);
 853         seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;
 854
 855         /* signalize caller that the packet is to be dropped. */
 856         if (window_protected(bat_priv, seq_diff,
 857                              &orig_node->batman_seqno_reset))
 858                 goto out;
 859
 860         rcu_read_lock();
 861         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 862                                  &orig_node->neigh_list, list) {
 863
 864                 is_duplicate |= bat_test_bit(tmp_neigh_node->real_bits,
 865                                              orig_node->last_real_seqno,
 866                                              batman_ogm_packet->seqno);
 867
 868                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 869                     (tmp_neigh_node->if_incoming == if_incoming))
 870                         set_mark = 1;
 871                 else
 872                         set_mark = 0;
 873
 874                 /* if the window moved, set the update flag. */
 875                 need_update |= bit_get_packet(bat_priv,
 876                                               tmp_neigh_node->real_bits,
 877                                               seq_diff, set_mark);
 878
 879                 tmp_neigh_node->real_packet_count =
 880                         bitmap_weight(tmp_neigh_node->real_bits,
 881                                       TQ_LOCAL_WINDOW_SIZE);
 882         }
 883         rcu_read_unlock();
 884
 885         if (need_update) {
 886                 bat_dbg(DBG_BATMAN, bat_priv,
 887                         "updating last_seqno: old %d, new %d\n",
 888                         orig_node->last_real_seqno, batman_ogm_packet->seqno);
 889                 orig_node->last_real_seqno = batman_ogm_packet->seqno;
 890         }
 891
 892         ret = is_duplicate;
 893
 894 out:
 895         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 896         orig_node_free_ref(orig_node);
 897         return ret;
 898 }
 899
 900 static void bat_iv_ogm_process(const struct ethhdr *ethhdr,
 901                                struct batman_ogm_packet *batman_ogm_packet,
 902                                const unsigned char *tt_buff,
 903                                struct hard_iface *if_incoming)
 904 {
 905         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 906         struct hard_iface *hard_iface;
 907         struct orig_node *orig_neigh_node, *orig_node;
 908         struct neigh_node *router = NULL, *router_router = NULL;
 909         struct neigh_node *orig_neigh_router = NULL;
 910         int has_directlink_flag;
 911         int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 912         int is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 913         int is_duplicate;
 914         uint32_t if_incoming_seqno;
 915
 916         /* Silently drop when the batman packet is actually not a
 917          * correct packet.
 918          *
 919          * This might happen if a packet is padded (e.g. Ethernet has a
 920          * minimum frame length of 64 byte) and the aggregation interprets
 921          * it as an additional length.
 922          *
 923          * TODO: A more sane solution would be to have a bit in the
 924          * batman_ogm_packet to detect whether the packet is the last
 925          * packet in an aggregation.  Here we expect that the padding
 926          * is always zero (or not 0x01)
 927          */
 928         if (batman_ogm_packet->header.packet_type != BAT_OGM)
 929                 return;
 930
 931         /* could be changed by schedule_own_packet() */
 932         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 933
 934         has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 935
 936         is_single_hop_neigh = (compare_eth(ethhdr->h_source,
 937                                            batman_ogm_packet->orig) ? 1 : 0);
 938
 939         bat_dbg(DBG_BATMAN, bat_priv,
 940                 "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",
 941                 ethhdr->h_source, if_incoming->net_dev->name,
 942                 if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,
 943                 batman_ogm_packet->prev_sender, batman_ogm_packet->seqno,
 944                 batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc,
 945                 batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,
 946                 batman_ogm_packet->header.ttl,
 947                 batman_ogm_packet->header.version, has_directlink_flag);
 948
 949         rcu_read_lock();
 950         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 951                 if (hard_iface->if_status != IF_ACTIVE)
 952                         continue;
 953
 954                 if (hard_iface->soft_iface != if_incoming->soft_iface)
 955                         continue;
 956
 957                 if (compare_eth(ethhdr->h_source,
 958                                 hard_iface->net_dev->dev_addr))
 959                         is_my_addr = 1;
 960
 961                 if (compare_eth(batman_ogm_packet->orig,
 962                                 hard_iface->net_dev->dev_addr))
 963                         is_my_orig = 1;
 964
 965                 if (compare_eth(batman_ogm_packet->prev_sender,
 966                                 hard_iface->net_dev->dev_addr))
 967                         is_my_oldorig = 1;
 968
 969                 if (is_broadcast_ether_addr(ethhdr->h_source))
 970                         is_broadcast = 1;
 971         }
 972         rcu_read_unlock();
 973
 974         if (batman_ogm_packet->header.version != COMPAT_VERSION) {
 975                 bat_dbg(DBG_BATMAN, bat_priv,
 976                         "Drop packet: incompatible batman version (%i)\n",
 977                         batman_ogm_packet->header.version);
 978                 return;
 979         }
 980
 981         if (is_my_addr) {
 982                 bat_dbg(DBG_BATMAN, bat_priv,
 983                         "Drop packet: received my own broadcast (sender: %pM)\n",
 984                         ethhdr->h_source);
 985                 return;
 986         }
 987
 988         if (is_broadcast) {
 989                 bat_dbg(DBG_BATMAN, bat_priv,
 990                         "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
 991                         ethhdr->h_source);
 992                 return;
 993         }
 994
 995         if (is_my_orig) {
 996                 unsigned long *word;
 997                 int offset;
 998
 999                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
1000                 if (!orig_neigh_node)
1001                         return;
1002
1003                 /* neighbor has to indicate direct link and it has to
1004                  * come via the corresponding interface */
1005                 /* save packet seqno for bidirectional check */
1006                 if (has_directlink_flag &&
1007                     compare_eth(if_incoming->net_dev->dev_addr,
1008                                 batman_ogm_packet->orig)) {
1009                         offset = if_incoming->if_num * NUM_WORDS;
1010
1011                         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1012                         word = &(orig_neigh_node->bcast_own[offset]);
1013                         bat_set_bit(word,
1014                                     if_incoming_seqno -
1015                                                 batman_ogm_packet->seqno - 2);
1016                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
1017                                 bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE);
1018                         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1019                 }
1020
1021                 bat_dbg(DBG_BATMAN, bat_priv,
1022                         "Drop packet: originator packet from myself (via neighbor)\n");
1023                 orig_node_free_ref(orig_neigh_node);
1024                 return;
1025         }
1026
1027         if (is_my_oldorig) {
1028                 bat_dbg(DBG_BATMAN, bat_priv,
1029                         "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1030                         ethhdr->h_source);
1031                 return;
1032         }
1033
1034         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
1035         if (!orig_node)
1036                 return;
1037
1038         is_duplicate = bat_iv_ogm_update_seqnos(ethhdr, batman_ogm_packet,
1039                                                 if_incoming);
1040
1041         if (is_duplicate == -1) {
1042                 bat_dbg(DBG_BATMAN, bat_priv,
1043                         "Drop packet: packet within seqno protection time (sender: %pM)\n",
1044                         ethhdr->h_source);
1045                 goto out;
1046         }
1047
1048         if (batman_ogm_packet->tq == 0) {
1049                 bat_dbg(DBG_BATMAN, bat_priv,
1050                         "Drop packet: originator packet with tq equal 0\n");
1051                 goto out;
1052         }
1053
1054         router = orig_node_get_router(orig_node);
1055         if (router)
1056                 router_router = orig_node_get_router(router->orig_node);
1057
1058         /* avoid temporary routing loops */
1059         if (router && router_router &&
1060             (compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&
1061             !(compare_eth(batman_ogm_packet->orig,
1062                           batman_ogm_packet->prev_sender)) &&
1063             (compare_eth(router->addr, router_router->addr))) {
1064                 bat_dbg(DBG_BATMAN, bat_priv,
1065                         "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1066                         ethhdr->h_source);
1067                 goto out;
1068         }
1069
1070         /* if sender is a direct neighbor the sender mac equals
1071          * originator mac */
1072         orig_neigh_node = (is_single_hop_neigh ?
1073                            orig_node :
1074                            get_orig_node(bat_priv, ethhdr->h_source));
1075         if (!orig_neigh_node)
1076                 goto out;
1077
1078         orig_neigh_router = orig_node_get_router(orig_neigh_node);
1079
1080         /* drop packet if sender is not a direct neighbor and if we
1081          * don't route towards it */
1082         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1083                 bat_dbg(DBG_BATMAN, bat_priv,
1084                         "Drop packet: OGM via unknown neighbor!\n");
1085                 goto out_neigh;
1086         }
1087
1088         is_bidirectional = bat_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1089                                               batman_ogm_packet, if_incoming);
1090
1091         bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet);
1092
1093         /* update ranking if it is not a duplicate or has the same
1094          * seqno and similar ttl as the non-duplicate */
1095         if (is_bidirectional &&
1096             (!is_duplicate ||
1097              ((orig_node->last_real_seqno == batman_ogm_packet->seqno) &&
1098               (orig_node->last_ttl - 3 <= batman_ogm_packet->header.ttl))))
1099                 bat_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1100                                        batman_ogm_packet, if_incoming,
1101                                        tt_buff, is_duplicate);
1102
1103         /* is single hop (direct) neighbor */
1104         if (is_single_hop_neigh) {
1105
1106                 /* mark direct link on incoming interface */
1107                 bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1108                                    1, if_incoming);
1109
1110                 bat_dbg(DBG_BATMAN, bat_priv,
1111                         "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1112                 goto out_neigh;
1113         }
1114
1115         /* multihop originator */
1116         if (!is_bidirectional) {
1117                 bat_dbg(DBG_BATMAN, bat_priv,
1118                         "Drop packet: not received via bidirectional link\n");
1119                 goto out_neigh;
1120         }
1121
1122         if (is_duplicate) {
1123                 bat_dbg(DBG_BATMAN, bat_priv,
1124                         "Drop packet: duplicate packet received\n");
1125                 goto out_neigh;
1126         }
1127
1128         bat_dbg(DBG_BATMAN, bat_priv,
1129                 "Forwarding packet: rebroadcast originator packet\n");
1130         bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1131                            0, if_incoming);
1132
1133 out_neigh:
1134         if ((orig_neigh_node) && (!is_single_hop_neigh))
1135                 orig_node_free_ref(orig_neigh_node);
1136 out:
1137         if (router)
1138                 neigh_node_free_ref(router);
1139         if (router_router)
1140                 neigh_node_free_ref(router_router);
1141         if (orig_neigh_router)
1142                 neigh_node_free_ref(orig_neigh_router);
1143
1144         orig_node_free_ref(orig_node);
1145 }
1146
1147 static void bat_iv_ogm_receive(struct hard_iface *if_incoming,
1148                                struct sk_buff *skb)
1149 {
1150         struct batman_ogm_packet *batman_ogm_packet;
1151         struct ethhdr *ethhdr;
1152         int buff_pos = 0, packet_len;
1153         unsigned char *tt_buff, *packet_buff;
1154
1155         packet_len = skb_headlen(skb);
1156         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1157         packet_buff = skb->data;
1158         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
1159
1160         /* unpack the aggregated packets and process them one by one */
1161         do {
1162                 /* network to host order for our 32bit seqno and the
1163                    orig_interval */
1164                 batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);
1165                 batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);
1166
1167                 tt_buff = packet_buff + buff_pos + BATMAN_OGM_LEN;
1168
1169                 bat_iv_ogm_process(ethhdr, batman_ogm_packet,
1170                                    tt_buff, if_incoming);
1171
1172                 buff_pos += BATMAN_OGM_LEN +
1173                                 tt_len(batman_ogm_packet->tt_num_changes);
1174
1175                 batman_ogm_packet = (struct batman_ogm_packet *)
1176                                                 (packet_buff + buff_pos);
1177         } while (bat_iv_ogm_aggr_packet(buff_pos, packet_len,
1178                                         batman_ogm_packet->tt_num_changes));
1179 }
1180
1181 static struct bat_algo_ops batman_iv __read_mostly = {
1182         .name = "BATMAN IV",
1183         .bat_iface_enable = bat_iv_ogm_iface_enable,
1184         .bat_iface_disable = bat_iv_ogm_iface_disable,
1185         .bat_ogm_init_primary = bat_iv_ogm_init_primary,
1186         .bat_ogm_update_mac = bat_iv_ogm_update_mac,
1187         .bat_ogm_schedule = bat_iv_ogm_schedule,
1188         .bat_ogm_emit = bat_iv_ogm_emit,
1189         .bat_ogm_receive = bat_iv_ogm_receive,
1190 };
1191
1192 int __init bat_iv_init(void)
1193 {
1194         return bat_algo_register(&batman_iv);
1195 }