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 int 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         int res = -1;
  38
  39         /* randomize initial seqno to avoid collision */
  40         get_random_bytes(&random_seqno, sizeof(random_seqno));
  41         atomic_set(&hard_iface->seqno, random_seqno);
  42
  43         hard_iface->packet_len = BATMAN_OGM_HLEN;
  44         hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
  45
  46         if (!hard_iface->packet_buff)
  47                 goto out;
  48
  49         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  50         batman_ogm_packet->header.packet_type = BAT_IV_OGM;
  51         batman_ogm_packet->header.version = COMPAT_VERSION;
  52         batman_ogm_packet->header.ttl = 2;
  53         batman_ogm_packet->flags = NO_FLAGS;
  54         batman_ogm_packet->tq = TQ_MAX_VALUE;
  55         batman_ogm_packet->tt_num_changes = 0;
  56         batman_ogm_packet->ttvn = 0;
  57
  58         res = 0;
  59
  60 out:
  61         return res;
  62 }
  63
  64 static void bat_iv_ogm_iface_disable(struct hard_iface *hard_iface)
  65 {
  66         kfree(hard_iface->packet_buff);
  67         hard_iface->packet_buff = NULL;
  68 }
  69
  70 static void bat_iv_ogm_primary_iface_set(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         batman_ogm_packet->flags = PRIMARIES_FIRST_HOP;
  76         batman_ogm_packet->header.ttl = TTL;
  77 }
  78
  79 static void bat_iv_ogm_update_mac(struct hard_iface *hard_iface)
  80 {
  81         struct batman_ogm_packet *batman_ogm_packet;
  82
  83         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  84         memcpy(batman_ogm_packet->orig,
  85                hard_iface->net_dev->dev_addr, ETH_ALEN);
  86         memcpy(batman_ogm_packet->prev_sender,
  87                hard_iface->net_dev->dev_addr, ETH_ALEN);
  88 }
  89
  90 /* when do we schedule our own ogm to be sent */
  91 static unsigned long bat_iv_ogm_emit_send_time(const struct bat_priv *bat_priv)
  92 {
  93         return jiffies + msecs_to_jiffies(
  94                    atomic_read(&bat_priv->orig_interval) -
  95                    JITTER + (random32() % 2*JITTER));
  96 }
  97
  98 /* when do we schedule a ogm packet to be sent */
  99 static unsigned long bat_iv_ogm_fwd_send_time(void)
 100 {
 101         return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
 102 }
 103
 104 /* apply hop penalty for a normal link */
 105 static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
 106 {
 107         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 108         return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
 109 }
 110
 111 /* is there another aggregated packet here? */
 112 static int bat_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 113                                   int tt_num_changes)
 114 {
 115         int next_buff_pos = buff_pos + BATMAN_OGM_HLEN + tt_len(tt_num_changes);
 116
 117         return (next_buff_pos <= packet_len) &&
 118                 (next_buff_pos <= MAX_AGGREGATION_BYTES);
 119 }
 120
 121 /* send a batman ogm to a given interface */
 122 static void bat_iv_ogm_send_to_if(struct forw_packet *forw_packet,
 123                                   struct hard_iface *hard_iface)
 124 {
 125         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 126         char *fwd_str;
 127         uint8_t packet_num;
 128         int16_t buff_pos;
 129         struct batman_ogm_packet *batman_ogm_packet;
 130         struct sk_buff *skb;
 131
 132         if (hard_iface->if_status != IF_ACTIVE)
 133                 return;
 134
 135         packet_num = 0;
 136         buff_pos = 0;
 137         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 138
 139         /* adjust all flags and log packets */
 140         while (bat_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 141                                       batman_ogm_packet->tt_num_changes)) {
 142
 143                 /* we might have aggregated direct link packets with an
 144                  * ordinary base packet */
 145                 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
 146                     (forw_packet->if_incoming == hard_iface))
 147                         batman_ogm_packet->flags |= DIRECTLINK;
 148                 else
 149                         batman_ogm_packet->flags &= ~DIRECTLINK;
 150
 151                 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
 152                                                             "Sending own" :
 153                                                             "Forwarding"));
 154                 bat_dbg(DBG_BATMAN, bat_priv,
 155                         "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
 156                         fwd_str, (packet_num > 0 ? "aggregated " : ""),
 157                         batman_ogm_packet->orig,
 158                         ntohl(batman_ogm_packet->seqno),
 159                         batman_ogm_packet->tq, batman_ogm_packet->header.ttl,
 160                         (batman_ogm_packet->flags & DIRECTLINK ?
 161                          "on" : "off"),
 162                         batman_ogm_packet->ttvn, hard_iface->net_dev->name,
 163                         hard_iface->net_dev->dev_addr);
 164
 165                 buff_pos += BATMAN_OGM_HLEN +
 166                                 tt_len(batman_ogm_packet->tt_num_changes);
 167                 packet_num++;
 168                 batman_ogm_packet = (struct batman_ogm_packet *)
 169                                         (forw_packet->skb->data + buff_pos);
 170         }
 171
 172         /* create clone because function is called more than once */
 173         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 174         if (skb)
 175                 send_skb_packet(skb, hard_iface, broadcast_addr);
 176 }
 177
 178 /* send a batman ogm packet */
 179 static void bat_iv_ogm_emit(struct forw_packet *forw_packet)
 180 {
 181         struct hard_iface *hard_iface;
 182         struct net_device *soft_iface;
 183         struct bat_priv *bat_priv;
 184         struct hard_iface *primary_if = NULL;
 185         struct batman_ogm_packet *batman_ogm_packet;
 186         unsigned char directlink;
 187
 188         batman_ogm_packet = (struct batman_ogm_packet *)
 189                                                 (forw_packet->skb->data);
 190         directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 191
 192         if (!forw_packet->if_incoming) {
 193                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 194                 goto out;
 195         }
 196
 197         soft_iface = forw_packet->if_incoming->soft_iface;
 198         bat_priv = netdev_priv(soft_iface);
 199
 200         if (forw_packet->if_incoming->if_status != IF_ACTIVE)
 201                 goto out;
 202
 203         primary_if = primary_if_get_selected(bat_priv);
 204         if (!primary_if)
 205                 goto out;
 206
 207         /* multihomed peer assumed */
 208         /* non-primary OGMs are only broadcasted on their interface */
 209         if ((directlink && (batman_ogm_packet->header.ttl == 1)) ||
 210             (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
 211
 212                 /* FIXME: what about aggregated packets ? */
 213                 bat_dbg(DBG_BATMAN, bat_priv,
 214                         "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
 215                         (forw_packet->own ? "Sending own" : "Forwarding"),
 216                         batman_ogm_packet->orig,
 217                         ntohl(batman_ogm_packet->seqno),
 218                         batman_ogm_packet->header.ttl,
 219                         forw_packet->if_incoming->net_dev->name,
 220                         forw_packet->if_incoming->net_dev->dev_addr);
 221
 222                 /* skb is only used once and than forw_packet is free'd */
 223                 send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
 224                                 broadcast_addr);
 225                 forw_packet->skb = NULL;
 226
 227                 goto out;
 228         }
 229
 230         /* broadcast on every interface */
 231         rcu_read_lock();
 232         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 233                 if (hard_iface->soft_iface != soft_iface)
 234                         continue;
 235
 236                 bat_iv_ogm_send_to_if(forw_packet, hard_iface);
 237         }
 238         rcu_read_unlock();
 239
 240 out:
 241         if (primary_if)
 242                 hardif_free_ref(primary_if);
 243 }
 244
 245 /* return true if new_packet can be aggregated with forw_packet */
 246 static bool bat_iv_ogm_can_aggregate(const struct batman_ogm_packet
 247                                                         *new_batman_ogm_packet,
 248                                      struct bat_priv *bat_priv,
 249                                      int packet_len, unsigned long send_time,
 250                                      bool directlink,
 251                                      const struct hard_iface *if_incoming,
 252                                      const struct forw_packet *forw_packet)
 253 {
 254         struct batman_ogm_packet *batman_ogm_packet;
 255         int aggregated_bytes = forw_packet->packet_len + packet_len;
 256         struct hard_iface *primary_if = NULL;
 257         bool res = false;
 258
 259         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 260
 261         /**
 262          * we can aggregate the current packet to this aggregated packet
 263          * if:
 264          *
 265          * - the send time is within our MAX_AGGREGATION_MS time
 266          * - the resulting packet wont be bigger than
 267          *   MAX_AGGREGATION_BYTES
 268          */
 269
 270         if (time_before(send_time, forw_packet->send_time) &&
 271             time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
 272                                         forw_packet->send_time) &&
 273             (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
 274
 275                 /**
 276                  * check aggregation compatibility
 277                  * -> direct link packets are broadcasted on
 278                  *    their interface only
 279                  * -> aggregate packet if the current packet is
 280                  *    a "global" packet as well as the base
 281                  *    packet
 282                  */
 283
 284                 primary_if = primary_if_get_selected(bat_priv);
 285                 if (!primary_if)
 286                         goto out;
 287
 288                 /* packets without direct link flag and high TTL
 289                  * are flooded through the net  */
 290                 if ((!directlink) &&
 291                     (!(batman_ogm_packet->flags & DIRECTLINK)) &&
 292                     (batman_ogm_packet->header.ttl != 1) &&
 293
 294                     /* own packets originating non-primary
 295                      * interfaces leave only that interface */
 296                     ((!forw_packet->own) ||
 297                      (forw_packet->if_incoming == primary_if))) {
 298                         res = true;
 299                         goto out;
 300                 }
 301
 302                 /* if the incoming packet is sent via this one
 303                  * interface only - we still can aggregate */
 304                 if ((directlink) &&
 305                     (new_batman_ogm_packet->header.ttl == 1) &&
 306                     (forw_packet->if_incoming == if_incoming) &&
 307
 308                     /* packets from direct neighbors or
 309                      * own secondary interface packets
 310                      * (= secondary interface packets in general) */
 311                     (batman_ogm_packet->flags & DIRECTLINK ||
 312                      (forw_packet->own &&
 313                       forw_packet->if_incoming != primary_if))) {
 314                         res = true;
 315                         goto out;
 316                 }
 317         }
 318
 319 out:
 320         if (primary_if)
 321                 hardif_free_ref(primary_if);
 322         return res;
 323 }
 324
 325 /* create a new aggregated packet and add this packet to it */
 326 static void bat_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 327                                      int packet_len, unsigned long send_time,
 328                                      bool direct_link,
 329                                      struct hard_iface *if_incoming,
 330                                      int own_packet)
 331 {
 332         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 333         struct forw_packet *forw_packet_aggr;
 334         unsigned char *skb_buff;
 335
 336         if (!atomic_inc_not_zero(&if_incoming->refcount))
 337                 return;
 338
 339         /* own packet should always be scheduled */
 340         if (!own_packet) {
 341                 if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 342                         bat_dbg(DBG_BATMAN, bat_priv,
 343                                 "batman packet queue full\n");
 344                         goto out;
 345                 }
 346         }
 347
 348         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 349         if (!forw_packet_aggr) {
 350                 if (!own_packet)
 351                         atomic_inc(&bat_priv->batman_queue_left);
 352                 goto out;
 353         }
 354
 355         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 356             (packet_len < MAX_AGGREGATION_BYTES))
 357                 forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
 358                                                       ETH_HLEN);
 359         else
 360                 forw_packet_aggr->skb = dev_alloc_skb(packet_len + ETH_HLEN);
 361
 362         if (!forw_packet_aggr->skb) {
 363                 if (!own_packet)
 364                         atomic_inc(&bat_priv->batman_queue_left);
 365                 kfree(forw_packet_aggr);
 366                 goto out;
 367         }
 368         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 369
 370         INIT_HLIST_NODE(&forw_packet_aggr->list);
 371
 372         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 373         forw_packet_aggr->packet_len = packet_len;
 374         memcpy(skb_buff, packet_buff, packet_len);
 375
 376         forw_packet_aggr->own = own_packet;
 377         forw_packet_aggr->if_incoming = if_incoming;
 378         forw_packet_aggr->num_packets = 0;
 379         forw_packet_aggr->direct_link_flags = NO_FLAGS;
 380         forw_packet_aggr->send_time = send_time;
 381
 382         /* save packet direct link flag status */
 383         if (direct_link)
 384                 forw_packet_aggr->direct_link_flags |= 1;
 385
 386         /* add new packet to packet list */
 387         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 388         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 389         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 390
 391         /* start timer for this packet */
 392         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 393                           send_outstanding_bat_ogm_packet);
 394         queue_delayed_work(bat_event_workqueue,
 395                            &forw_packet_aggr->delayed_work,
 396                            send_time - jiffies);
 397
 398         return;
 399 out:
 400         hardif_free_ref(if_incoming);
 401 }
 402
 403 /* aggregate a new packet into the existing ogm packet */
 404 static void bat_iv_ogm_aggregate(struct forw_packet *forw_packet_aggr,
 405                                  const unsigned char *packet_buff,
 406                                  int packet_len, bool direct_link)
 407 {
 408         unsigned char *skb_buff;
 409
 410         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 411         memcpy(skb_buff, packet_buff, packet_len);
 412         forw_packet_aggr->packet_len += packet_len;
 413         forw_packet_aggr->num_packets++;
 414
 415         /* save packet direct link flag status */
 416         if (direct_link)
 417                 forw_packet_aggr->direct_link_flags |=
 418                         (1 << forw_packet_aggr->num_packets);
 419 }
 420
 421 static void bat_iv_ogm_queue_add(struct bat_priv *bat_priv,
 422                                  unsigned char *packet_buff,
 423                                  int packet_len, struct hard_iface *if_incoming,
 424                                  int own_packet, unsigned long send_time)
 425 {
 426         /**
 427          * _aggr -> pointer to the packet we want to aggregate with
 428          * _pos -> pointer to the position in the queue
 429          */
 430         struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
 431         struct hlist_node *tmp_node;
 432         struct batman_ogm_packet *batman_ogm_packet;
 433         bool direct_link;
 434
 435         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
 436         direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0;
 437
 438         /* find position for the packet in the forward queue */
 439         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 440         /* own packets are not to be aggregated */
 441         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 442                 hlist_for_each_entry(forw_packet_pos, tmp_node,
 443                                      &bat_priv->forw_bat_list, list) {
 444                         if (bat_iv_ogm_can_aggregate(batman_ogm_packet,
 445                                                      bat_priv, packet_len,
 446                                                      send_time, direct_link,
 447                                                      if_incoming,
 448                                                      forw_packet_pos)) {
 449                                 forw_packet_aggr = forw_packet_pos;
 450                                 break;
 451                         }
 452                 }
 453         }
 454
 455         /* nothing to aggregate with - either aggregation disabled or no
 456          * suitable aggregation packet found */
 457         if (!forw_packet_aggr) {
 458                 /* the following section can run without the lock */
 459                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 460
 461                 /**
 462                  * if we could not aggregate this packet with one of the others
 463                  * we hold it back for a while, so that it might be aggregated
 464                  * later on
 465                  */
 466                 if ((!own_packet) &&
 467                     (atomic_read(&bat_priv->aggregated_ogms)))
 468                         send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
 469
 470                 bat_iv_ogm_aggregate_new(packet_buff, packet_len,
 471                                          send_time, direct_link,
 472                                          if_incoming, own_packet);
 473         } else {
 474                 bat_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 475                                      packet_len, direct_link);
 476                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 477         }
 478 }
 479
 480 static void bat_iv_ogm_forward(struct orig_node *orig_node,
 481                                const struct ethhdr *ethhdr,
 482                                struct batman_ogm_packet *batman_ogm_packet,
 483                                int directlink, struct hard_iface *if_incoming)
 484 {
 485         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 486         struct neigh_node *router;
 487         uint8_t in_tq, in_ttl, tq_avg = 0;
 488         uint8_t tt_num_changes;
 489
 490         if (batman_ogm_packet->header.ttl <= 1) {
 491                 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
 492                 return;
 493         }
 494
 495         router = orig_node_get_router(orig_node);
 496
 497         in_tq = batman_ogm_packet->tq;
 498         in_ttl = batman_ogm_packet->header.ttl;
 499         tt_num_changes = batman_ogm_packet->tt_num_changes;
 500
 501         batman_ogm_packet->header.ttl--;
 502         memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 503
 504         /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
 505          * of our best tq value */
 506         if (router && router->tq_avg != 0) {
 507
 508                 /* rebroadcast ogm of best ranking neighbor as is */
 509                 if (!compare_eth(router->addr, ethhdr->h_source)) {
 510                         batman_ogm_packet->tq = router->tq_avg;
 511
 512                         if (router->last_ttl)
 513                                 batman_ogm_packet->header.ttl =
 514                                         router->last_ttl - 1;
 515                 }
 516
 517                 tq_avg = router->tq_avg;
 518         }
 519
 520         if (router)
 521                 neigh_node_free_ref(router);
 522
 523         /* apply hop penalty */
 524         batman_ogm_packet->tq = hop_penalty(batman_ogm_packet->tq, bat_priv);
 525
 526         bat_dbg(DBG_BATMAN, bat_priv,
 527                 "Forwarding packet: tq_orig: %i, tq_avg: %i, tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
 528                 in_tq, tq_avg, batman_ogm_packet->tq, in_ttl - 1,
 529                 batman_ogm_packet->header.ttl);
 530
 531         batman_ogm_packet->seqno = htonl(batman_ogm_packet->seqno);
 532         batman_ogm_packet->tt_crc = htons(batman_ogm_packet->tt_crc);
 533
 534         /* switch of primaries first hop flag when forwarding */
 535         batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP;
 536         if (directlink)
 537                 batman_ogm_packet->flags |= DIRECTLINK;
 538         else
 539                 batman_ogm_packet->flags &= ~DIRECTLINK;
 540
 541         bat_iv_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet,
 542                              BATMAN_OGM_HLEN + tt_len(tt_num_changes),
 543                              if_incoming, 0, bat_iv_ogm_fwd_send_time());
 544 }
 545
 546 static void bat_iv_ogm_schedule(struct hard_iface *hard_iface,
 547                                 int tt_num_changes)
 548 {
 549         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 550         struct batman_ogm_packet *batman_ogm_packet;
 551         struct hard_iface *primary_if;
 552         int vis_server;
 553
 554         vis_server = atomic_read(&bat_priv->vis_mode);
 555         primary_if = primary_if_get_selected(bat_priv);
 556
 557         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
 558
 559         /* change sequence number to network order */
 560         batman_ogm_packet->seqno =
 561                         htonl((uint32_t)atomic_read(&hard_iface->seqno));
 562
 563         batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn);
 564         batman_ogm_packet->tt_crc = htons((uint16_t)
 565                                                 atomic_read(&bat_priv->tt_crc));
 566         if (tt_num_changes >= 0)
 567                 batman_ogm_packet->tt_num_changes = tt_num_changes;
 568
 569         if (vis_server == VIS_TYPE_SERVER_SYNC)
 570                 batman_ogm_packet->flags |= VIS_SERVER;
 571         else
 572                 batman_ogm_packet->flags &= ~VIS_SERVER;
 573
 574         if ((hard_iface == primary_if) &&
 575             (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
 576                 batman_ogm_packet->gw_flags =
 577                                 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 578         else
 579                 batman_ogm_packet->gw_flags = NO_FLAGS;
 580
 581         atomic_inc(&hard_iface->seqno);
 582
 583         slide_own_bcast_window(hard_iface);
 584         bat_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff,
 585                              hard_iface->packet_len, hard_iface, 1,
 586                              bat_iv_ogm_emit_send_time(bat_priv));
 587
 588         if (primary_if)
 589                 hardif_free_ref(primary_if);
 590 }
 591
 592 static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv,
 593                                    struct orig_node *orig_node,
 594                                    const struct ethhdr *ethhdr,
 595                                    const struct batman_ogm_packet
 596                                                         *batman_ogm_packet,
 597                                    struct hard_iface *if_incoming,
 598                                    const unsigned char *tt_buff,
 599                                    int is_duplicate)
 600 {
 601         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 602         struct neigh_node *router = NULL;
 603         struct orig_node *orig_node_tmp;
 604         struct hlist_node *node;
 605         uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
 606
 607         bat_dbg(DBG_BATMAN, bat_priv,
 608                 "update_originator(): Searching and updating originator entry of received packet\n");
 609
 610         rcu_read_lock();
 611         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 612                                  &orig_node->neigh_list, list) {
 613                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 614                     (tmp_neigh_node->if_incoming == if_incoming) &&
 615                      atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 616                         if (neigh_node)
 617                                 neigh_node_free_ref(neigh_node);
 618                         neigh_node = tmp_neigh_node;
 619                         continue;
 620                 }
 621
 622                 if (is_duplicate)
 623                         continue;
 624
 625                 spin_lock_bh(&tmp_neigh_node->tq_lock);
 626                 ring_buffer_set(tmp_neigh_node->tq_recv,
 627                                 &tmp_neigh_node->tq_index, 0);
 628                 tmp_neigh_node->tq_avg =
 629                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 630                 spin_unlock_bh(&tmp_neigh_node->tq_lock);
 631         }
 632
 633         if (!neigh_node) {
 634                 struct orig_node *orig_tmp;
 635
 636                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 637                 if (!orig_tmp)
 638                         goto unlock;
 639
 640                 neigh_node = create_neighbor(orig_node, orig_tmp,
 641                                              ethhdr->h_source, if_incoming);
 642
 643                 orig_node_free_ref(orig_tmp);
 644                 if (!neigh_node)
 645                         goto unlock;
 646         } else
 647                 bat_dbg(DBG_BATMAN, bat_priv,
 648                         "Updating existing last-hop neighbor of originator\n");
 649
 650         rcu_read_unlock();
 651
 652         orig_node->flags = batman_ogm_packet->flags;
 653         neigh_node->last_valid = jiffies;
 654
 655         spin_lock_bh(&neigh_node->tq_lock);
 656         ring_buffer_set(neigh_node->tq_recv,
 657                         &neigh_node->tq_index,
 658                         batman_ogm_packet->tq);
 659         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 660         spin_unlock_bh(&neigh_node->tq_lock);
 661
 662         if (!is_duplicate) {
 663                 orig_node->last_ttl = batman_ogm_packet->header.ttl;
 664                 neigh_node->last_ttl = batman_ogm_packet->header.ttl;
 665         }
 666
 667         bonding_candidate_add(orig_node, neigh_node);
 668
 669         /* if this neighbor already is our next hop there is nothing
 670          * to change */
 671         router = orig_node_get_router(orig_node);
 672         if (router == neigh_node)
 673                 goto update_tt;
 674
 675         /* if this neighbor does not offer a better TQ we won't consider it */
 676         if (router && (router->tq_avg > neigh_node->tq_avg))
 677                 goto update_tt;
 678
 679         /* if the TQ is the same and the link not more symmetric we
 680          * won't consider it either */
 681         if (router && (neigh_node->tq_avg == router->tq_avg)) {
 682                 orig_node_tmp = router->orig_node;
 683                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 684                 bcast_own_sum_orig =
 685                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 686                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 687
 688                 orig_node_tmp = neigh_node->orig_node;
 689                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 690                 bcast_own_sum_neigh =
 691                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 692                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 693
 694                 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
 695                         goto update_tt;
 696         }
 697
 698         update_route(bat_priv, orig_node, neigh_node);
 699
 700 update_tt:
 701         /* I have to check for transtable changes only if the OGM has been
 702          * sent through a primary interface */
 703         if (((batman_ogm_packet->orig != ethhdr->h_source) &&
 704              (batman_ogm_packet->header.ttl > 2)) ||
 705             (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
 706                 tt_update_orig(bat_priv, orig_node, tt_buff,
 707                                batman_ogm_packet->tt_num_changes,
 708                                batman_ogm_packet->ttvn,
 709                                batman_ogm_packet->tt_crc);
 710
 711         if (orig_node->gw_flags != batman_ogm_packet->gw_flags)
 712                 gw_node_update(bat_priv, orig_node,
 713                                batman_ogm_packet->gw_flags);
 714
 715         orig_node->gw_flags = batman_ogm_packet->gw_flags;
 716
 717         /* restart gateway selection if fast or late switching was enabled */
 718         if ((orig_node->gw_flags) &&
 719             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 720             (atomic_read(&bat_priv->gw_sel_class) > 2))
 721                 gw_check_election(bat_priv, orig_node);
 722
 723         goto out;
 724
 725 unlock:
 726         rcu_read_unlock();
 727 out:
 728         if (neigh_node)
 729                 neigh_node_free_ref(neigh_node);
 730         if (router)
 731                 neigh_node_free_ref(router);
 732 }
 733
 734 static int bat_iv_ogm_calc_tq(struct orig_node *orig_node,
 735                               struct orig_node *orig_neigh_node,
 736                               struct batman_ogm_packet *batman_ogm_packet,
 737                               struct hard_iface *if_incoming)
 738 {
 739         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 740         struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
 741         struct hlist_node *node;
 742         uint8_t total_count;
 743         uint8_t orig_eq_count, neigh_rq_count, tq_own;
 744         int tq_asym_penalty, ret = 0;
 745
 746         /* find corresponding one hop neighbor */
 747         rcu_read_lock();
 748         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 749                                  &orig_neigh_node->neigh_list, list) {
 750
 751                 if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
 752                         continue;
 753
 754                 if (tmp_neigh_node->if_incoming != if_incoming)
 755                         continue;
 756
 757                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 758                         continue;
 759
 760                 neigh_node = tmp_neigh_node;
 761                 break;
 762         }
 763         rcu_read_unlock();
 764
 765         if (!neigh_node)
 766                 neigh_node = create_neighbor(orig_neigh_node,
 767                                              orig_neigh_node,
 768                                              orig_neigh_node->orig,
 769                                              if_incoming);
 770
 771         if (!neigh_node)
 772                 goto out;
 773
 774         /* if orig_node is direct neighbor update neigh_node last_valid */
 775         if (orig_node == orig_neigh_node)
 776                 neigh_node->last_valid = jiffies;
 777
 778         orig_node->last_valid = jiffies;
 779
 780         /* find packet count of corresponding one hop neighbor */
 781         spin_lock_bh(&orig_node->ogm_cnt_lock);
 782         orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
 783         neigh_rq_count = neigh_node->real_packet_count;
 784         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 785
 786         /* pay attention to not get a value bigger than 100 % */
 787         total_count = (orig_eq_count > neigh_rq_count ?
 788                        neigh_rq_count : orig_eq_count);
 789
 790         /* if we have too few packets (too less data) we set tq_own to zero */
 791         /* if we receive too few packets it is not considered bidirectional */
 792         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 793             (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 794                 tq_own = 0;
 795         else
 796                 /* neigh_node->real_packet_count is never zero as we
 797                  * only purge old information when getting new
 798                  * information */
 799                 tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
 800
 801         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 802          * affect the nearly-symmetric links only a little, but
 803          * punishes asymmetric links more.  This will give a value
 804          * between 0 and TQ_MAX_VALUE
 805          */
 806         tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
 807                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 808                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 809                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
 810                                         (TQ_LOCAL_WINDOW_SIZE *
 811                                          TQ_LOCAL_WINDOW_SIZE *
 812                                          TQ_LOCAL_WINDOW_SIZE);
 813
 814         batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own
 815                                                         * tq_asym_penalty) /
 816                                                 (TQ_MAX_VALUE * TQ_MAX_VALUE));
 817
 818         bat_dbg(DBG_BATMAN, bat_priv,
 819                 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
 820                 orig_node->orig, orig_neigh_node->orig, total_count,
 821                 neigh_rq_count, tq_own, tq_asym_penalty, batman_ogm_packet->tq);
 822
 823         /* if link has the minimum required transmission quality
 824          * consider it bidirectional */
 825         if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 826                 ret = 1;
 827
 828 out:
 829         if (neigh_node)
 830                 neigh_node_free_ref(neigh_node);
 831         return ret;
 832 }
 833
 834 /* processes a batman packet for all interfaces, adjusts the sequence number and
 835  * finds out whether it is a duplicate.
 836  * returns:
 837  *   1 the packet is a duplicate
 838  *   0 the packet has not yet been received
 839  *  -1 the packet is old and has been received while the seqno window
 840  *     was protected. Caller should drop it.
 841  */
 842 static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
 843                                     const struct batman_ogm_packet
 844                                                         *batman_ogm_packet,
 845                                     const struct hard_iface *if_incoming)
 846 {
 847         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 848         struct orig_node *orig_node;
 849         struct neigh_node *tmp_neigh_node;
 850         struct hlist_node *node;
 851         int is_duplicate = 0;
 852         int32_t seq_diff;
 853         int need_update = 0;
 854         int set_mark, ret = -1;
 855
 856         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
 857         if (!orig_node)
 858                 return 0;
 859
 860         spin_lock_bh(&orig_node->ogm_cnt_lock);
 861         seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;
 862
 863         /* signalize caller that the packet is to be dropped. */
 864         if (!hlist_empty(&orig_node->neigh_list) &&
 865             window_protected(bat_priv, seq_diff,
 866                              &orig_node->batman_seqno_reset))
 867                 goto out;
 868
 869         rcu_read_lock();
 870         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 871                                  &orig_node->neigh_list, list) {
 872
 873                 is_duplicate |= bat_test_bit(tmp_neigh_node->real_bits,
 874                                              orig_node->last_real_seqno,
 875                                              batman_ogm_packet->seqno);
 876
 877                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 878                     (tmp_neigh_node->if_incoming == if_incoming))
 879                         set_mark = 1;
 880                 else
 881                         set_mark = 0;
 882
 883                 /* if the window moved, set the update flag. */
 884                 need_update |= bit_get_packet(bat_priv,
 885                                               tmp_neigh_node->real_bits,
 886                                               seq_diff, set_mark);
 887
 888                 tmp_neigh_node->real_packet_count =
 889                         bitmap_weight(tmp_neigh_node->real_bits,
 890                                       TQ_LOCAL_WINDOW_SIZE);
 891         }
 892         rcu_read_unlock();
 893
 894         if (need_update) {
 895                 bat_dbg(DBG_BATMAN, bat_priv,
 896                         "updating last_seqno: old %u, new %u\n",
 897                         orig_node->last_real_seqno, batman_ogm_packet->seqno);
 898                 orig_node->last_real_seqno = batman_ogm_packet->seqno;
 899         }
 900
 901         ret = is_duplicate;
 902
 903 out:
 904         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 905         orig_node_free_ref(orig_node);
 906         return ret;
 907 }
 908
 909 static void bat_iv_ogm_process(const struct ethhdr *ethhdr,
 910                                struct batman_ogm_packet *batman_ogm_packet,
 911                                const unsigned char *tt_buff,
 912                                struct hard_iface *if_incoming)
 913 {
 914         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 915         struct hard_iface *hard_iface;
 916         struct orig_node *orig_neigh_node, *orig_node;
 917         struct neigh_node *router = NULL, *router_router = NULL;
 918         struct neigh_node *orig_neigh_router = NULL;
 919         int has_directlink_flag;
 920         int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 921         int is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 922         int is_duplicate;
 923         uint32_t if_incoming_seqno;
 924
 925         /* Silently drop when the batman packet is actually not a
 926          * correct packet.
 927          *
 928          * This might happen if a packet is padded (e.g. Ethernet has a
 929          * minimum frame length of 64 byte) and the aggregation interprets
 930          * it as an additional length.
 931          *
 932          * TODO: A more sane solution would be to have a bit in the
 933          * batman_ogm_packet to detect whether the packet is the last
 934          * packet in an aggregation.  Here we expect that the padding
 935          * is always zero (or not 0x01)
 936          */
 937         if (batman_ogm_packet->header.packet_type != BAT_IV_OGM)
 938                 return;
 939
 940         /* could be changed by schedule_own_packet() */
 941         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 942
 943         has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 944
 945         is_single_hop_neigh = (compare_eth(ethhdr->h_source,
 946                                            batman_ogm_packet->orig) ? 1 : 0);
 947
 948         bat_dbg(DBG_BATMAN, bat_priv,
 949                 "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n",
 950                 ethhdr->h_source, if_incoming->net_dev->name,
 951                 if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,
 952                 batman_ogm_packet->prev_sender, batman_ogm_packet->seqno,
 953                 batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc,
 954                 batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,
 955                 batman_ogm_packet->header.ttl,
 956                 batman_ogm_packet->header.version, has_directlink_flag);
 957
 958         rcu_read_lock();
 959         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 960                 if (hard_iface->if_status != IF_ACTIVE)
 961                         continue;
 962
 963                 if (hard_iface->soft_iface != if_incoming->soft_iface)
 964                         continue;
 965
 966                 if (compare_eth(ethhdr->h_source,
 967                                 hard_iface->net_dev->dev_addr))
 968                         is_my_addr = 1;
 969
 970                 if (compare_eth(batman_ogm_packet->orig,
 971                                 hard_iface->net_dev->dev_addr))
 972                         is_my_orig = 1;
 973
 974                 if (compare_eth(batman_ogm_packet->prev_sender,
 975                                 hard_iface->net_dev->dev_addr))
 976                         is_my_oldorig = 1;
 977
 978                 if (is_broadcast_ether_addr(ethhdr->h_source))
 979                         is_broadcast = 1;
 980         }
 981         rcu_read_unlock();
 982
 983         if (batman_ogm_packet->header.version != COMPAT_VERSION) {
 984                 bat_dbg(DBG_BATMAN, bat_priv,
 985                         "Drop packet: incompatible batman version (%i)\n",
 986                         batman_ogm_packet->header.version);
 987                 return;
 988         }
 989
 990         if (is_my_addr) {
 991                 bat_dbg(DBG_BATMAN, bat_priv,
 992                         "Drop packet: received my own broadcast (sender: %pM)\n",
 993                         ethhdr->h_source);
 994                 return;
 995         }
 996
 997         if (is_broadcast) {
 998                 bat_dbg(DBG_BATMAN, bat_priv,
 999                         "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1000                         ethhdr->h_source);
1001                 return;
1002         }
1003
1004         if (is_my_orig) {
1005                 unsigned long *word;
1006                 int offset;
1007
1008                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
1009                 if (!orig_neigh_node)
1010                         return;
1011
1012                 /* neighbor has to indicate direct link and it has to
1013                  * come via the corresponding interface */
1014                 /* save packet seqno for bidirectional check */
1015                 if (has_directlink_flag &&
1016                     compare_eth(if_incoming->net_dev->dev_addr,
1017                                 batman_ogm_packet->orig)) {
1018                         offset = if_incoming->if_num * NUM_WORDS;
1019
1020                         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1021                         word = &(orig_neigh_node->bcast_own[offset]);
1022                         bat_set_bit(word,
1023                                     if_incoming_seqno -
1024                                                 batman_ogm_packet->seqno - 2);
1025                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
1026                                 bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE);
1027                         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1028                 }
1029
1030                 bat_dbg(DBG_BATMAN, bat_priv,
1031                         "Drop packet: originator packet from myself (via neighbor)\n");
1032                 orig_node_free_ref(orig_neigh_node);
1033                 return;
1034         }
1035
1036         if (is_my_oldorig) {
1037                 bat_dbg(DBG_BATMAN, bat_priv,
1038                         "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1039                         ethhdr->h_source);
1040                 return;
1041         }
1042
1043         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
1044         if (!orig_node)
1045                 return;
1046
1047         is_duplicate = bat_iv_ogm_update_seqnos(ethhdr, batman_ogm_packet,
1048                                                 if_incoming);
1049
1050         if (is_duplicate == -1) {
1051                 bat_dbg(DBG_BATMAN, bat_priv,
1052                         "Drop packet: packet within seqno protection time (sender: %pM)\n",
1053                         ethhdr->h_source);
1054                 goto out;
1055         }
1056
1057         if (batman_ogm_packet->tq == 0) {
1058                 bat_dbg(DBG_BATMAN, bat_priv,
1059                         "Drop packet: originator packet with tq equal 0\n");
1060                 goto out;
1061         }
1062
1063         router = orig_node_get_router(orig_node);
1064         if (router)
1065                 router_router = orig_node_get_router(router->orig_node);
1066
1067         /* avoid temporary routing loops */
1068         if (router && router_router &&
1069             (compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&
1070             !(compare_eth(batman_ogm_packet->orig,
1071                           batman_ogm_packet->prev_sender)) &&
1072             (compare_eth(router->addr, router_router->addr))) {
1073                 bat_dbg(DBG_BATMAN, bat_priv,
1074                         "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1075                         ethhdr->h_source);
1076                 goto out;
1077         }
1078
1079         /* if sender is a direct neighbor the sender mac equals
1080          * originator mac */
1081         orig_neigh_node = (is_single_hop_neigh ?
1082                            orig_node :
1083                            get_orig_node(bat_priv, ethhdr->h_source));
1084         if (!orig_neigh_node)
1085                 goto out;
1086
1087         orig_neigh_router = orig_node_get_router(orig_neigh_node);
1088
1089         /* drop packet if sender is not a direct neighbor and if we
1090          * don't route towards it */
1091         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1092                 bat_dbg(DBG_BATMAN, bat_priv,
1093                         "Drop packet: OGM via unknown neighbor!\n");
1094                 goto out_neigh;
1095         }
1096
1097         is_bidirectional = bat_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1098                                               batman_ogm_packet, if_incoming);
1099
1100         bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet);
1101
1102         /* update ranking if it is not a duplicate or has the same
1103          * seqno and similar ttl as the non-duplicate */
1104         if (is_bidirectional &&
1105             (!is_duplicate ||
1106              ((orig_node->last_real_seqno == batman_ogm_packet->seqno) &&
1107               (orig_node->last_ttl - 3 <= batman_ogm_packet->header.ttl))))
1108                 bat_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1109                                        batman_ogm_packet, if_incoming,
1110                                        tt_buff, is_duplicate);
1111
1112         /* is single hop (direct) neighbor */
1113         if (is_single_hop_neigh) {
1114
1115                 /* mark direct link on incoming interface */
1116                 bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1117                                    1, if_incoming);
1118
1119                 bat_dbg(DBG_BATMAN, bat_priv,
1120                         "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1121                 goto out_neigh;
1122         }
1123
1124         /* multihop originator */
1125         if (!is_bidirectional) {
1126                 bat_dbg(DBG_BATMAN, bat_priv,
1127                         "Drop packet: not received via bidirectional link\n");
1128                 goto out_neigh;
1129         }
1130
1131         if (is_duplicate) {
1132                 bat_dbg(DBG_BATMAN, bat_priv,
1133                         "Drop packet: duplicate packet received\n");
1134                 goto out_neigh;
1135         }
1136
1137         bat_dbg(DBG_BATMAN, bat_priv,
1138                 "Forwarding packet: rebroadcast originator packet\n");
1139         bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1140                            0, if_incoming);
1141
1142 out_neigh:
1143         if ((orig_neigh_node) && (!is_single_hop_neigh))
1144                 orig_node_free_ref(orig_neigh_node);
1145 out:
1146         if (router)
1147                 neigh_node_free_ref(router);
1148         if (router_router)
1149                 neigh_node_free_ref(router_router);
1150         if (orig_neigh_router)
1151                 neigh_node_free_ref(orig_neigh_router);
1152
1153         orig_node_free_ref(orig_node);
1154 }
1155
1156 static void bat_iv_ogm_receive(struct hard_iface *if_incoming,
1157                                struct sk_buff *skb)
1158 {
1159         struct batman_ogm_packet *batman_ogm_packet;
1160         struct ethhdr *ethhdr;
1161         int buff_pos = 0, packet_len;
1162         unsigned char *tt_buff, *packet_buff;
1163
1164         packet_len = skb_headlen(skb);
1165         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1166         packet_buff = skb->data;
1167         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
1168
1169         /* unpack the aggregated packets and process them one by one */
1170         do {
1171                 /* network to host order for our 32bit seqno and the
1172                    orig_interval */
1173                 batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);
1174                 batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);
1175
1176                 tt_buff = packet_buff + buff_pos + BATMAN_OGM_HLEN;
1177
1178                 bat_iv_ogm_process(ethhdr, batman_ogm_packet,
1179                                    tt_buff, if_incoming);
1180
1181                 buff_pos += BATMAN_OGM_HLEN +
1182                                 tt_len(batman_ogm_packet->tt_num_changes);
1183
1184                 batman_ogm_packet = (struct batman_ogm_packet *)
1185                                                 (packet_buff + buff_pos);
1186         } while (bat_iv_ogm_aggr_packet(buff_pos, packet_len,
1187                                         batman_ogm_packet->tt_num_changes));
1188 }
1189
1190 static struct bat_algo_ops batman_iv __read_mostly = {
1191         .name = "BATMAN IV",
1192         .bat_iface_enable = bat_iv_ogm_iface_enable,
1193         .bat_iface_disable = bat_iv_ogm_iface_disable,
1194         .bat_primary_iface_set = bat_iv_ogm_primary_iface_set,
1195         .bat_ogm_update_mac = bat_iv_ogm_update_mac,
1196         .bat_ogm_schedule = bat_iv_ogm_schedule,
1197         .bat_ogm_emit = bat_iv_ogm_emit,
1198         .bat_ogm_receive = bat_iv_ogm_receive,
1199 };
1200
1201 int __init bat_iv_init(void)
1202 {
1203         return bat_algo_register(&batman_iv);
1204 }