net/batman-adv/bat_iv_ogm.c

   1 /*
   2  * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "bat_ogm.h"
  24 #include "translation-table.h"
  25 #include "ring_buffer.h"
  26 #include "originator.h"
  27 #include "routing.h"
  28 #include "gateway_common.h"
  29 #include "gateway_client.h"
  30 #include "hard-interface.h"
  31 #include "send.h"
  32
  33 void bat_ogm_init(struct hard_iface *hard_iface)
  34 {
  35         struct batman_ogm_packet *batman_ogm_packet;
  36
  37         hard_iface->packet_len = BATMAN_OGM_LEN;
  38         hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
  39
  40         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  41         batman_ogm_packet->packet_type = BAT_OGM;
  42         batman_ogm_packet->version = COMPAT_VERSION;
  43         batman_ogm_packet->flags = NO_FLAGS;
  44         batman_ogm_packet->ttl = 2;
  45         batman_ogm_packet->tq = TQ_MAX_VALUE;
  46         batman_ogm_packet->tt_num_changes = 0;
  47         batman_ogm_packet->ttvn = 0;
  48 }
  49
  50 void bat_ogm_init_primary(struct hard_iface *hard_iface)
  51 {
  52         struct batman_ogm_packet *batman_ogm_packet;
  53
  54         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  55         batman_ogm_packet->flags = PRIMARIES_FIRST_HOP;
  56         batman_ogm_packet->ttl = TTL;
  57 }
  58
  59 void bat_ogm_update_mac(struct hard_iface *hard_iface)
  60 {
  61         struct batman_ogm_packet *batman_ogm_packet;
  62
  63         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  64         memcpy(batman_ogm_packet->orig,
  65                hard_iface->net_dev->dev_addr, ETH_ALEN);
  66         memcpy(batman_ogm_packet->prev_sender,
  67                hard_iface->net_dev->dev_addr, ETH_ALEN);
  68 }
  69
  70 /* when do we schedule our own ogm to be sent */
  71 static unsigned long bat_ogm_emit_send_time(const struct bat_priv *bat_priv)
  72 {
  73         return jiffies + msecs_to_jiffies(
  74                    atomic_read(&bat_priv->orig_interval) -
  75                    JITTER + (random32() % 2*JITTER));
  76 }
  77
  78 /* when do we schedule a ogm packet to be sent */
  79 static unsigned long bat_ogm_fwd_send_time(void)
  80 {
  81         return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
  82 }
  83
  84 /* apply hop penalty for a normal link */
  85 static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
  86 {
  87         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
  88         return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
  89 }
  90
  91 /* is there another aggregated packet here? */
  92 static int bat_ogm_aggr_packet(int buff_pos, int packet_len,
  93                                int tt_num_changes)
  94 {
  95         int next_buff_pos = buff_pos + BATMAN_OGM_LEN + tt_len(tt_num_changes);
  96
  97         return (next_buff_pos <= packet_len) &&
  98                 (next_buff_pos <= MAX_AGGREGATION_BYTES);
  99 }
 100
 101 /* send a batman ogm to a given interface */
 102 static void bat_ogm_send_to_if(struct forw_packet *forw_packet,
 103                                struct hard_iface *hard_iface)
 104 {
 105         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 106         char *fwd_str;
 107         uint8_t packet_num;
 108         int16_t buff_pos;
 109         struct batman_ogm_packet *batman_ogm_packet;
 110         struct sk_buff *skb;
 111
 112         if (hard_iface->if_status != IF_ACTIVE)
 113                 return;
 114
 115         packet_num = 0;
 116         buff_pos = 0;
 117         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 118
 119         /* adjust all flags and log packets */
 120         while (bat_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 121                                    batman_ogm_packet->tt_num_changes)) {
 122
 123                 /* we might have aggregated direct link packets with an
 124                  * ordinary base packet */
 125                 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
 126                     (forw_packet->if_incoming == hard_iface))
 127                         batman_ogm_packet->flags |= DIRECTLINK;
 128                 else
 129                         batman_ogm_packet->flags &= ~DIRECTLINK;
 130
 131                 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
 132                                                             "Sending own" :
 133                                                             "Forwarding"));
 134                 bat_dbg(DBG_BATMAN, bat_priv,
 135                         "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d,"
 136                         " IDF %s, ttvn %d) on interface %s [%pM]\n",
 137                         fwd_str, (packet_num > 0 ? "aggregated " : ""),
 138                         batman_ogm_packet->orig,
 139                         ntohl(batman_ogm_packet->seqno),
 140                         batman_ogm_packet->tq, batman_ogm_packet->ttl,
 141                         (batman_ogm_packet->flags & DIRECTLINK ?
 142                          "on" : "off"),
 143                         batman_ogm_packet->ttvn, hard_iface->net_dev->name,
 144                         hard_iface->net_dev->dev_addr);
 145
 146                 buff_pos += BATMAN_OGM_LEN +
 147                                 tt_len(batman_ogm_packet->tt_num_changes);
 148                 packet_num++;
 149                 batman_ogm_packet = (struct batman_ogm_packet *)
 150                                         (forw_packet->skb->data + buff_pos);
 151         }
 152
 153         /* create clone because function is called more than once */
 154         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 155         if (skb)
 156                 send_skb_packet(skb, hard_iface, broadcast_addr);
 157 }
 158
 159 /* send a batman ogm packet */
 160 void bat_ogm_emit(struct forw_packet *forw_packet)
 161 {
 162         struct hard_iface *hard_iface;
 163         struct net_device *soft_iface;
 164         struct bat_priv *bat_priv;
 165         struct hard_iface *primary_if = NULL;
 166         struct batman_ogm_packet *batman_ogm_packet;
 167         unsigned char directlink;
 168
 169         batman_ogm_packet = (struct batman_ogm_packet *)
 170                                                 (forw_packet->skb->data);
 171         directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 172
 173         if (!forw_packet->if_incoming) {
 174                 pr_err("Error - can't forward packet: incoming iface not "
 175                        "specified\n");
 176                 goto out;
 177         }
 178
 179         soft_iface = forw_packet->if_incoming->soft_iface;
 180         bat_priv = netdev_priv(soft_iface);
 181
 182         if (forw_packet->if_incoming->if_status != IF_ACTIVE)
 183                 goto out;
 184
 185         primary_if = primary_if_get_selected(bat_priv);
 186         if (!primary_if)
 187                 goto out;
 188
 189         /* multihomed peer assumed */
 190         /* non-primary OGMs are only broadcasted on their interface */
 191         if ((directlink && (batman_ogm_packet->ttl == 1)) ||
 192             (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
 193
 194                 /* FIXME: what about aggregated packets ? */
 195                 bat_dbg(DBG_BATMAN, bat_priv,
 196                         "%s packet (originator %pM, seqno %d, TTL %d) "
 197                         "on interface %s [%pM]\n",
 198                         (forw_packet->own ? "Sending own" : "Forwarding"),
 199                         batman_ogm_packet->orig,
 200                         ntohl(batman_ogm_packet->seqno),
 201                         batman_ogm_packet->ttl,
 202                         forw_packet->if_incoming->net_dev->name,
 203                         forw_packet->if_incoming->net_dev->dev_addr);
 204
 205                 /* skb is only used once and than forw_packet is free'd */
 206                 send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
 207                                 broadcast_addr);
 208                 forw_packet->skb = NULL;
 209
 210                 goto out;
 211         }
 212
 213         /* broadcast on every interface */
 214         rcu_read_lock();
 215         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 216                 if (hard_iface->soft_iface != soft_iface)
 217                         continue;
 218
 219                 bat_ogm_send_to_if(forw_packet, hard_iface);
 220         }
 221         rcu_read_unlock();
 222
 223 out:
 224         if (primary_if)
 225                 hardif_free_ref(primary_if);
 226 }
 227
 228 /* return true if new_packet can be aggregated with forw_packet */
 229 static bool bat_ogm_can_aggregate(const struct batman_ogm_packet
 230                                                         *new_batman_ogm_packet,
 231                                   struct bat_priv *bat_priv,
 232                                   int packet_len, unsigned long send_time,
 233                                   bool directlink,
 234                                   const struct hard_iface *if_incoming,
 235                                   const struct forw_packet *forw_packet)
 236 {
 237         struct batman_ogm_packet *batman_ogm_packet;
 238         int aggregated_bytes = forw_packet->packet_len + packet_len;
 239         struct hard_iface *primary_if = NULL;
 240         bool res = false;
 241
 242         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 243
 244         /**
 245          * we can aggregate the current packet to this aggregated packet
 246          * if:
 247          *
 248          * - the send time is within our MAX_AGGREGATION_MS time
 249          * - the resulting packet wont be bigger than
 250          *   MAX_AGGREGATION_BYTES
 251          */
 252
 253         if (time_before(send_time, forw_packet->send_time) &&
 254             time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
 255                                         forw_packet->send_time) &&
 256             (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
 257
 258                 /**
 259                  * check aggregation compatibility
 260                  * -> direct link packets are broadcasted on
 261                  *    their interface only
 262                  * -> aggregate packet if the current packet is
 263                  *    a "global" packet as well as the base
 264                  *    packet
 265                  */
 266
 267                 primary_if = primary_if_get_selected(bat_priv);
 268                 if (!primary_if)
 269                         goto out;
 270
 271                 /* packets without direct link flag and high TTL
 272                  * are flooded through the net  */
 273                 if ((!directlink) &&
 274                     (!(batman_ogm_packet->flags & DIRECTLINK)) &&
 275                     (batman_ogm_packet->ttl != 1) &&
 276
 277                     /* own packets originating non-primary
 278                      * interfaces leave only that interface */
 279                     ((!forw_packet->own) ||
 280                      (forw_packet->if_incoming == primary_if))) {
 281                         res = true;
 282                         goto out;
 283                 }
 284
 285                 /* if the incoming packet is sent via this one
 286                  * interface only - we still can aggregate */
 287                 if ((directlink) &&
 288                     (new_batman_ogm_packet->ttl == 1) &&
 289                     (forw_packet->if_incoming == if_incoming) &&
 290
 291                     /* packets from direct neighbors or
 292                      * own secondary interface packets
 293                      * (= secondary interface packets in general) */
 294                     (batman_ogm_packet->flags & DIRECTLINK ||
 295                      (forw_packet->own &&
 296                       forw_packet->if_incoming != primary_if))) {
 297                         res = true;
 298                         goto out;
 299                 }
 300         }
 301
 302 out:
 303         if (primary_if)
 304                 hardif_free_ref(primary_if);
 305         return res;
 306 }
 307
 308 /* create a new aggregated packet and add this packet to it */
 309 static void bat_ogm_aggregate_new(const unsigned char *packet_buff,
 310                                   int packet_len, unsigned long send_time,
 311                                   bool direct_link,
 312                                   struct hard_iface *if_incoming,
 313                                   int own_packet)
 314 {
 315         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 316         struct forw_packet *forw_packet_aggr;
 317         unsigned char *skb_buff;
 318
 319         if (!atomic_inc_not_zero(&if_incoming->refcount))
 320                 return;
 321
 322         /* own packet should always be scheduled */
 323         if (!own_packet) {
 324                 if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 325                         bat_dbg(DBG_BATMAN, bat_priv,
 326                                 "batman packet queue full\n");
 327                         goto out;
 328                 }
 329         }
 330
 331         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 332         if (!forw_packet_aggr) {
 333                 if (!own_packet)
 334                         atomic_inc(&bat_priv->batman_queue_left);
 335                 goto out;
 336         }
 337
 338         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 339             (packet_len < MAX_AGGREGATION_BYTES))
 340                 forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
 341                                                       sizeof(struct ethhdr));
 342         else
 343                 forw_packet_aggr->skb = dev_alloc_skb(packet_len +
 344                                                       sizeof(struct ethhdr));
 345
 346         if (!forw_packet_aggr->skb) {
 347                 if (!own_packet)
 348                         atomic_inc(&bat_priv->batman_queue_left);
 349                 kfree(forw_packet_aggr);
 350                 goto out;
 351         }
 352         skb_reserve(forw_packet_aggr->skb, sizeof(struct ethhdr));
 353
 354         INIT_HLIST_NODE(&forw_packet_aggr->list);
 355
 356         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 357         forw_packet_aggr->packet_len = packet_len;
 358         memcpy(skb_buff, packet_buff, packet_len);
 359
 360         forw_packet_aggr->own = own_packet;
 361         forw_packet_aggr->if_incoming = if_incoming;
 362         forw_packet_aggr->num_packets = 0;
 363         forw_packet_aggr->direct_link_flags = NO_FLAGS;
 364         forw_packet_aggr->send_time = send_time;
 365
 366         /* save packet direct link flag status */
 367         if (direct_link)
 368                 forw_packet_aggr->direct_link_flags |= 1;
 369
 370         /* add new packet to packet list */
 371         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 372         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 373         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 374
 375         /* start timer for this packet */
 376         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 377                           send_outstanding_bat_ogm_packet);
 378         queue_delayed_work(bat_event_workqueue,
 379                            &forw_packet_aggr->delayed_work,
 380                            send_time - jiffies);
 381
 382         return;
 383 out:
 384         hardif_free_ref(if_incoming);
 385 }
 386
 387 /* aggregate a new packet into the existing ogm packet */
 388 static void bat_ogm_aggregate(struct forw_packet *forw_packet_aggr,
 389                               const unsigned char *packet_buff,
 390                               int packet_len, bool direct_link)
 391 {
 392         unsigned char *skb_buff;
 393
 394         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 395         memcpy(skb_buff, packet_buff, packet_len);
 396         forw_packet_aggr->packet_len += packet_len;
 397         forw_packet_aggr->num_packets++;
 398
 399         /* save packet direct link flag status */
 400         if (direct_link)
 401                 forw_packet_aggr->direct_link_flags |=
 402                         (1 << forw_packet_aggr->num_packets);
 403 }
 404
 405 static void bat_ogm_queue_add(struct bat_priv *bat_priv,
 406                               unsigned char *packet_buff,
 407                               int packet_len, struct hard_iface *if_incoming,
 408                               int own_packet, unsigned long send_time)
 409 {
 410         /**
 411          * _aggr -> pointer to the packet we want to aggregate with
 412          * _pos -> pointer to the position in the queue
 413          */
 414         struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
 415         struct hlist_node *tmp_node;
 416         struct batman_ogm_packet *batman_ogm_packet;
 417         bool direct_link;
 418
 419         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
 420         direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0;
 421
 422         /* find position for the packet in the forward queue */
 423         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 424         /* own packets are not to be aggregated */
 425         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 426                 hlist_for_each_entry(forw_packet_pos, tmp_node,
 427                                      &bat_priv->forw_bat_list, list) {
 428                         if (bat_ogm_can_aggregate(batman_ogm_packet,
 429                                                   bat_priv, packet_len,
 430                                                   send_time, direct_link,
 431                                                   if_incoming,
 432                                                   forw_packet_pos)) {
 433                                 forw_packet_aggr = forw_packet_pos;
 434                                 break;
 435                         }
 436                 }
 437         }
 438
 439         /* nothing to aggregate with - either aggregation disabled or no
 440          * suitable aggregation packet found */
 441         if (!forw_packet_aggr) {
 442                 /* the following section can run without the lock */
 443                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 444
 445                 /**
 446                  * if we could not aggregate this packet with one of the others
 447                  * we hold it back for a while, so that it might be aggregated
 448                  * later on
 449                  */
 450                 if ((!own_packet) &&
 451                     (atomic_read(&bat_priv->aggregated_ogms)))
 452                         send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
 453
 454                 bat_ogm_aggregate_new(packet_buff, packet_len,
 455                                       send_time, direct_link,
 456                                       if_incoming, own_packet);
 457         } else {
 458                 bat_ogm_aggregate(forw_packet_aggr, packet_buff, packet_len,
 459                                   direct_link);
 460                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 461         }
 462 }
 463
 464 static void bat_ogm_forward(struct orig_node *orig_node,
 465                             const struct ethhdr *ethhdr,
 466                             struct batman_ogm_packet *batman_ogm_packet,
 467                             int directlink, struct hard_iface *if_incoming)
 468 {
 469         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 470         struct neigh_node *router;
 471         uint8_t in_tq, in_ttl, tq_avg = 0;
 472         uint8_t tt_num_changes;
 473
 474         if (batman_ogm_packet->ttl <= 1) {
 475                 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
 476                 return;
 477         }
 478
 479         router = orig_node_get_router(orig_node);
 480
 481         in_tq = batman_ogm_packet->tq;
 482         in_ttl = batman_ogm_packet->ttl;
 483         tt_num_changes = batman_ogm_packet->tt_num_changes;
 484
 485         batman_ogm_packet->ttl--;
 486         memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 487
 488         /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
 489          * of our best tq value */
 490         if (router && router->tq_avg != 0) {
 491
 492                 /* rebroadcast ogm of best ranking neighbor as is */
 493                 if (!compare_eth(router->addr, ethhdr->h_source)) {
 494                         batman_ogm_packet->tq = router->tq_avg;
 495
 496                         if (router->last_ttl)
 497                                 batman_ogm_packet->ttl = router->last_ttl - 1;
 498                 }
 499
 500                 tq_avg = router->tq_avg;
 501         }
 502
 503         if (router)
 504                 neigh_node_free_ref(router);
 505
 506         /* apply hop penalty */
 507         batman_ogm_packet->tq = hop_penalty(batman_ogm_packet->tq, bat_priv);
 508
 509         bat_dbg(DBG_BATMAN, bat_priv,
 510                 "Forwarding packet: tq_orig: %i, tq_avg: %i, "
 511                 "tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
 512                 in_tq, tq_avg, batman_ogm_packet->tq, in_ttl - 1,
 513                 batman_ogm_packet->ttl);
 514
 515         batman_ogm_packet->seqno = htonl(batman_ogm_packet->seqno);
 516         batman_ogm_packet->tt_crc = htons(batman_ogm_packet->tt_crc);
 517
 518         /* switch of primaries first hop flag when forwarding */
 519         batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP;
 520         if (directlink)
 521                 batman_ogm_packet->flags |= DIRECTLINK;
 522         else
 523                 batman_ogm_packet->flags &= ~DIRECTLINK;
 524
 525         bat_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet,
 526                           BATMAN_OGM_LEN + tt_len(tt_num_changes),
 527                           if_incoming, 0, bat_ogm_fwd_send_time());
 528 }
 529
 530 void bat_ogm_schedule(struct hard_iface *hard_iface, int tt_num_changes)
 531 {
 532         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 533         struct batman_ogm_packet *batman_ogm_packet;
 534         struct hard_iface *primary_if;
 535         int vis_server;
 536
 537         vis_server = atomic_read(&bat_priv->vis_mode);
 538         primary_if = primary_if_get_selected(bat_priv);
 539
 540         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
 541
 542         /* change sequence number to network order */
 543         batman_ogm_packet->seqno =
 544                         htonl((uint32_t)atomic_read(&hard_iface->seqno));
 545
 546         batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn);
 547         batman_ogm_packet->tt_crc = htons((uint16_t)
 548                                                 atomic_read(&bat_priv->tt_crc));
 549         if (tt_num_changes >= 0)
 550                 batman_ogm_packet->tt_num_changes = tt_num_changes;
 551
 552         if (vis_server == VIS_TYPE_SERVER_SYNC)
 553                 batman_ogm_packet->flags |= VIS_SERVER;
 554         else
 555                 batman_ogm_packet->flags &= ~VIS_SERVER;
 556
 557         if ((hard_iface == primary_if) &&
 558             (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
 559                 batman_ogm_packet->gw_flags =
 560                                 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 561         else
 562                 batman_ogm_packet->gw_flags = NO_FLAGS;
 563
 564         atomic_inc(&hard_iface->seqno);
 565
 566         slide_own_bcast_window(hard_iface);
 567         bat_ogm_queue_add(bat_priv, hard_iface->packet_buff,
 568                           hard_iface->packet_len, hard_iface, 1,
 569                           bat_ogm_emit_send_time(bat_priv));
 570
 571         if (primary_if)
 572                 hardif_free_ref(primary_if);
 573 }
 574
 575 static void bat_ogm_orig_update(struct bat_priv *bat_priv,
 576                                 struct orig_node *orig_node,
 577                                 const struct ethhdr *ethhdr,
 578                                 const struct batman_ogm_packet
 579                                                         *batman_ogm_packet,
 580                                 struct hard_iface *if_incoming,
 581                                 const unsigned char *tt_buff, int is_duplicate)
 582 {
 583         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 584         struct neigh_node *router = NULL;
 585         struct orig_node *orig_node_tmp;
 586         struct hlist_node *node;
 587         uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
 588
 589         bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
 590                 "Searching and updating originator entry of received packet\n");
 591
 592         rcu_read_lock();
 593         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 594                                  &orig_node->neigh_list, list) {
 595                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 596                     (tmp_neigh_node->if_incoming == if_incoming) &&
 597                      atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 598                         if (neigh_node)
 599                                 neigh_node_free_ref(neigh_node);
 600                         neigh_node = tmp_neigh_node;
 601                         continue;
 602                 }
 603
 604                 if (is_duplicate)
 605                         continue;
 606
 607                 spin_lock_bh(&tmp_neigh_node->tq_lock);
 608                 ring_buffer_set(tmp_neigh_node->tq_recv,
 609                                 &tmp_neigh_node->tq_index, 0);
 610                 tmp_neigh_node->tq_avg =
 611                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 612                 spin_unlock_bh(&tmp_neigh_node->tq_lock);
 613         }
 614
 615         if (!neigh_node) {
 616                 struct orig_node *orig_tmp;
 617
 618                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 619                 if (!orig_tmp)
 620                         goto unlock;
 621
 622                 neigh_node = create_neighbor(orig_node, orig_tmp,
 623                                              ethhdr->h_source, if_incoming);
 624
 625                 orig_node_free_ref(orig_tmp);
 626                 if (!neigh_node)
 627                         goto unlock;
 628         } else
 629                 bat_dbg(DBG_BATMAN, bat_priv,
 630                         "Updating existing last-hop neighbor of originator\n");
 631
 632         rcu_read_unlock();
 633
 634         orig_node->flags = batman_ogm_packet->flags;
 635         neigh_node->last_valid = jiffies;
 636
 637         spin_lock_bh(&neigh_node->tq_lock);
 638         ring_buffer_set(neigh_node->tq_recv,
 639                         &neigh_node->tq_index,
 640                         batman_ogm_packet->tq);
 641         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 642         spin_unlock_bh(&neigh_node->tq_lock);
 643
 644         if (!is_duplicate) {
 645                 orig_node->last_ttl = batman_ogm_packet->ttl;
 646                 neigh_node->last_ttl = batman_ogm_packet->ttl;
 647         }
 648
 649         bonding_candidate_add(orig_node, neigh_node);
 650
 651         /* if this neighbor already is our next hop there is nothing
 652          * to change */
 653         router = orig_node_get_router(orig_node);
 654         if (router == neigh_node)
 655                 goto update_tt;
 656
 657         /* if this neighbor does not offer a better TQ we won't consider it */
 658         if (router && (router->tq_avg > neigh_node->tq_avg))
 659                 goto update_tt;
 660
 661         /* if the TQ is the same and the link not more symmetric we
 662          * won't consider it either */
 663         if (router && (neigh_node->tq_avg == router->tq_avg)) {
 664                 orig_node_tmp = router->orig_node;
 665                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 666                 bcast_own_sum_orig =
 667                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 668                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 669
 670                 orig_node_tmp = neigh_node->orig_node;
 671                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 672                 bcast_own_sum_neigh =
 673                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 674                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 675
 676                 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
 677                         goto update_tt;
 678         }
 679
 680         update_route(bat_priv, orig_node, neigh_node);
 681
 682 update_tt:
 683         /* I have to check for transtable changes only if the OGM has been
 684          * sent through a primary interface */
 685         if (((batman_ogm_packet->orig != ethhdr->h_source) &&
 686              (batman_ogm_packet->ttl > 2)) ||
 687             (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
 688                 tt_update_orig(bat_priv, orig_node, tt_buff,
 689                                batman_ogm_packet->tt_num_changes,
 690                                batman_ogm_packet->ttvn,
 691                                batman_ogm_packet->tt_crc);
 692
 693         if (orig_node->gw_flags != batman_ogm_packet->gw_flags)
 694                 gw_node_update(bat_priv, orig_node,
 695                                batman_ogm_packet->gw_flags);
 696
 697         orig_node->gw_flags = batman_ogm_packet->gw_flags;
 698
 699         /* restart gateway selection if fast or late switching was enabled */
 700         if ((orig_node->gw_flags) &&
 701             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 702             (atomic_read(&bat_priv->gw_sel_class) > 2))
 703                 gw_check_election(bat_priv, orig_node);
 704
 705         goto out;
 706
 707 unlock:
 708         rcu_read_unlock();
 709 out:
 710         if (neigh_node)
 711                 neigh_node_free_ref(neigh_node);
 712         if (router)
 713                 neigh_node_free_ref(router);
 714 }
 715
 716 static int bat_ogm_calc_tq(struct orig_node *orig_node,
 717                            struct orig_node *orig_neigh_node,
 718                            struct batman_ogm_packet *batman_ogm_packet,
 719                            struct hard_iface *if_incoming)
 720 {
 721         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 722         struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
 723         struct hlist_node *node;
 724         uint8_t total_count;
 725         uint8_t orig_eq_count, neigh_rq_count, tq_own;
 726         int tq_asym_penalty, ret = 0;
 727
 728         /* find corresponding one hop neighbor */
 729         rcu_read_lock();
 730         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 731                                  &orig_neigh_node->neigh_list, list) {
 732
 733                 if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
 734                         continue;
 735
 736                 if (tmp_neigh_node->if_incoming != if_incoming)
 737                         continue;
 738
 739                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 740                         continue;
 741
 742                 neigh_node = tmp_neigh_node;
 743                 break;
 744         }
 745         rcu_read_unlock();
 746
 747         if (!neigh_node)
 748                 neigh_node = create_neighbor(orig_neigh_node,
 749                                              orig_neigh_node,
 750                                              orig_neigh_node->orig,
 751                                              if_incoming);
 752
 753         if (!neigh_node)
 754                 goto out;
 755
 756         /* if orig_node is direct neighbor update neigh_node last_valid */
 757         if (orig_node == orig_neigh_node)
 758                 neigh_node->last_valid = jiffies;
 759
 760         orig_node->last_valid = jiffies;
 761
 762         /* find packet count of corresponding one hop neighbor */
 763         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
 764         orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
 765         neigh_rq_count = neigh_node->real_packet_count;
 766         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
 767
 768         /* pay attention to not get a value bigger than 100 % */
 769         total_count = (orig_eq_count > neigh_rq_count ?
 770                        neigh_rq_count : orig_eq_count);
 771
 772         /* if we have too few packets (too less data) we set tq_own to zero */
 773         /* if we receive too few packets it is not considered bidirectional */
 774         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 775             (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 776                 tq_own = 0;
 777         else
 778                 /* neigh_node->real_packet_count is never zero as we
 779                  * only purge old information when getting new
 780                  * information */
 781                 tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
 782
 783         /*
 784          * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 785          * affect the nearly-symmetric links only a little, but
 786          * punishes asymmetric links more.  This will give a value
 787          * between 0 and TQ_MAX_VALUE
 788          */
 789         tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
 790                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 791                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 792                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
 793                                         (TQ_LOCAL_WINDOW_SIZE *
 794                                          TQ_LOCAL_WINDOW_SIZE *
 795                                          TQ_LOCAL_WINDOW_SIZE);
 796
 797         batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own
 798                                                         * tq_asym_penalty) /
 799                                                 (TQ_MAX_VALUE * TQ_MAX_VALUE));
 800
 801         bat_dbg(DBG_BATMAN, bat_priv,
 802                 "bidirectional: "
 803                 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
 804                 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
 805                 "total tq: %3i\n",
 806                 orig_node->orig, orig_neigh_node->orig, total_count,
 807                 neigh_rq_count, tq_own, tq_asym_penalty, batman_ogm_packet->tq);
 808
 809         /* if link has the minimum required transmission quality
 810          * consider it bidirectional */
 811         if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 812                 ret = 1;
 813
 814 out:
 815         if (neigh_node)
 816                 neigh_node_free_ref(neigh_node);
 817         return ret;
 818 }
 819
 820 /* processes a batman packet for all interfaces, adjusts the sequence number and
 821  * finds out whether it is a duplicate.
 822  * returns:
 823  *   1 the packet is a duplicate
 824  *   0 the packet has not yet been received
 825  *  -1 the packet is old and has been received while the seqno window
 826  *     was protected. Caller should drop it.
 827  */
 828 static int bat_ogm_update_seqnos(const struct ethhdr *ethhdr,
 829                                  const struct batman_ogm_packet
 830                                                         *batman_ogm_packet,
 831                                  const struct hard_iface *if_incoming)
 832 {
 833         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 834         struct orig_node *orig_node;
 835         struct neigh_node *tmp_neigh_node;
 836         struct hlist_node *node;
 837         int is_duplicate = 0;
 838         int32_t seq_diff;
 839         int need_update = 0;
 840         int set_mark, ret = -1;
 841
 842         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
 843         if (!orig_node)
 844                 return 0;
 845
 846         spin_lock_bh(&orig_node->ogm_cnt_lock);
 847         seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;
 848
 849         /* signalize caller that the packet is to be dropped. */
 850         if (window_protected(bat_priv, seq_diff,
 851                              &orig_node->batman_seqno_reset))
 852                 goto out;
 853
 854         rcu_read_lock();
 855         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 856                                  &orig_node->neigh_list, list) {
 857
 858                 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
 859                                                orig_node->last_real_seqno,
 860                                                batman_ogm_packet->seqno);
 861
 862                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 863                     (tmp_neigh_node->if_incoming == if_incoming))
 864                         set_mark = 1;
 865                 else
 866                         set_mark = 0;
 867
 868                 /* if the window moved, set the update flag. */
 869                 need_update |= bit_get_packet(bat_priv,
 870                                               tmp_neigh_node->real_bits,
 871                                               seq_diff, set_mark);
 872
 873                 tmp_neigh_node->real_packet_count =
 874                         bit_packet_count(tmp_neigh_node->real_bits);
 875         }
 876         rcu_read_unlock();
 877
 878         if (need_update) {
 879                 bat_dbg(DBG_BATMAN, bat_priv,
 880                         "updating last_seqno: old %d, new %d\n",
 881                         orig_node->last_real_seqno, batman_ogm_packet->seqno);
 882                 orig_node->last_real_seqno = batman_ogm_packet->seqno;
 883         }
 884
 885         ret = is_duplicate;
 886
 887 out:
 888         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 889         orig_node_free_ref(orig_node);
 890         return ret;
 891 }
 892
 893 static void bat_ogm_process(const struct ethhdr *ethhdr,
 894                             struct batman_ogm_packet *batman_ogm_packet,
 895                             const unsigned char *tt_buff,
 896                             struct hard_iface *if_incoming)
 897 {
 898         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 899         struct hard_iface *hard_iface;
 900         struct orig_node *orig_neigh_node, *orig_node;
 901         struct neigh_node *router = NULL, *router_router = NULL;
 902         struct neigh_node *orig_neigh_router = NULL;
 903         int has_directlink_flag;
 904         int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 905         int is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 906         int is_duplicate;
 907         uint32_t if_incoming_seqno;
 908
 909         /* Silently drop when the batman packet is actually not a
 910          * correct packet.
 911          *
 912          * This might happen if a packet is padded (e.g. Ethernet has a
 913          * minimum frame length of 64 byte) and the aggregation interprets
 914          * it as an additional length.
 915          *
 916          * TODO: A more sane solution would be to have a bit in the
 917          * batman_ogm_packet to detect whether the packet is the last
 918          * packet in an aggregation.  Here we expect that the padding
 919          * is always zero (or not 0x01)
 920          */
 921         if (batman_ogm_packet->packet_type != BAT_OGM)
 922                 return;
 923
 924         /* could be changed by schedule_own_packet() */
 925         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 926
 927         has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 928
 929         is_single_hop_neigh = (compare_eth(ethhdr->h_source,
 930                                            batman_ogm_packet->orig) ? 1 : 0);
 931
 932         bat_dbg(DBG_BATMAN, bat_priv,
 933                 "Received BATMAN packet via NB: %pM, IF: %s [%pM] "
 934                 "(from OG: %pM, via prev OG: %pM, seqno %d, ttvn %u, "
 935                 "crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n",
 936                 ethhdr->h_source, if_incoming->net_dev->name,
 937                 if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,
 938                 batman_ogm_packet->prev_sender, batman_ogm_packet->seqno,
 939                 batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc,
 940                 batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,
 941                 batman_ogm_packet->ttl, batman_ogm_packet->version,
 942                 has_directlink_flag);
 943
 944         rcu_read_lock();
 945         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 946                 if (hard_iface->if_status != IF_ACTIVE)
 947                         continue;
 948
 949                 if (hard_iface->soft_iface != if_incoming->soft_iface)
 950                         continue;
 951
 952                 if (compare_eth(ethhdr->h_source,
 953                                 hard_iface->net_dev->dev_addr))
 954                         is_my_addr = 1;
 955
 956                 if (compare_eth(batman_ogm_packet->orig,
 957                                 hard_iface->net_dev->dev_addr))
 958                         is_my_orig = 1;
 959
 960                 if (compare_eth(batman_ogm_packet->prev_sender,
 961                                 hard_iface->net_dev->dev_addr))
 962                         is_my_oldorig = 1;
 963
 964                 if (is_broadcast_ether_addr(ethhdr->h_source))
 965                         is_broadcast = 1;
 966         }
 967         rcu_read_unlock();
 968
 969         if (batman_ogm_packet->version != COMPAT_VERSION) {
 970                 bat_dbg(DBG_BATMAN, bat_priv,
 971                         "Drop packet: incompatible batman version (%i)\n",
 972                         batman_ogm_packet->version);
 973                 return;
 974         }
 975
 976         if (is_my_addr) {
 977                 bat_dbg(DBG_BATMAN, bat_priv,
 978                         "Drop packet: received my own broadcast (sender: %pM"
 979                         ")\n",
 980                         ethhdr->h_source);
 981                 return;
 982         }
 983
 984         if (is_broadcast) {
 985                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 986                 "ignoring all packets with broadcast source addr (sender: %pM"
 987                 ")\n", ethhdr->h_source);
 988                 return;
 989         }
 990
 991         if (is_my_orig) {
 992                 unsigned long *word;
 993                 int offset;
 994
 995                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
 996                 if (!orig_neigh_node)
 997                         return;
 998
 999                 /* neighbor has to indicate direct link and it has to
1000                  * come via the corresponding interface */
1001                 /* save packet seqno for bidirectional check */
1002                 if (has_directlink_flag &&
1003                     compare_eth(if_incoming->net_dev->dev_addr,
1004                                 batman_ogm_packet->orig)) {
1005                         offset = if_incoming->if_num * NUM_WORDS;
1006
1007                         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1008                         word = &(orig_neigh_node->bcast_own[offset]);
1009                         bit_mark(word,
1010                                  if_incoming_seqno -
1011                                                 batman_ogm_packet->seqno - 2);
1012                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
1013                                 bit_packet_count(word);
1014                         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1015                 }
1016
1017                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
1018                         "originator packet from myself (via neighbor)\n");
1019                 orig_node_free_ref(orig_neigh_node);
1020                 return;
1021         }
1022
1023         if (is_my_oldorig) {
1024                 bat_dbg(DBG_BATMAN, bat_priv,
1025                         "Drop packet: ignoring all rebroadcast echos (sender: "
1026                         "%pM)\n", ethhdr->h_source);
1027                 return;
1028         }
1029
1030         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
1031         if (!orig_node)
1032                 return;
1033
1034         is_duplicate = bat_ogm_update_seqnos(ethhdr, batman_ogm_packet,
1035                                              if_incoming);
1036
1037         if (is_duplicate == -1) {
1038                 bat_dbg(DBG_BATMAN, bat_priv,
1039                         "Drop packet: packet within seqno protection time "
1040                         "(sender: %pM)\n", ethhdr->h_source);
1041                 goto out;
1042         }
1043
1044         if (batman_ogm_packet->tq == 0) {
1045                 bat_dbg(DBG_BATMAN, bat_priv,
1046                         "Drop packet: originator packet with tq equal 0\n");
1047                 goto out;
1048         }
1049
1050         router = orig_node_get_router(orig_node);
1051         if (router)
1052                 router_router = orig_node_get_router(router->orig_node);
1053
1054         /* avoid temporary routing loops */
1055         if (router && router_router &&
1056             (compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&
1057             !(compare_eth(batman_ogm_packet->orig,
1058                           batman_ogm_packet->prev_sender)) &&
1059             (compare_eth(router->addr, router_router->addr))) {
1060                 bat_dbg(DBG_BATMAN, bat_priv,
1061                         "Drop packet: ignoring all rebroadcast packets that "
1062                         "may make me loop (sender: %pM)\n", ethhdr->h_source);
1063                 goto out;
1064         }
1065
1066         /* if sender is a direct neighbor the sender mac equals
1067          * originator mac */
1068         orig_neigh_node = (is_single_hop_neigh ?
1069                            orig_node :
1070                            get_orig_node(bat_priv, ethhdr->h_source));
1071         if (!orig_neigh_node)
1072                 goto out;
1073
1074         orig_neigh_router = orig_node_get_router(orig_neigh_node);
1075
1076         /* drop packet if sender is not a direct neighbor and if we
1077          * don't route towards it */
1078         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1079                 bat_dbg(DBG_BATMAN, bat_priv,
1080                         "Drop packet: OGM via unknown neighbor!\n");
1081                 goto out_neigh;
1082         }
1083
1084         is_bidirectional = bat_ogm_calc_tq(orig_node, orig_neigh_node,
1085                                            batman_ogm_packet, if_incoming);
1086
1087         bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet);
1088
1089         /* update ranking if it is not a duplicate or has the same
1090          * seqno and similar ttl as the non-duplicate */
1091         if (is_bidirectional &&
1092             (!is_duplicate ||
1093              ((orig_node->last_real_seqno == batman_ogm_packet->seqno) &&
1094               (orig_node->last_ttl - 3 <= batman_ogm_packet->ttl))))
1095                 bat_ogm_orig_update(bat_priv, orig_node, ethhdr,
1096                                     batman_ogm_packet, if_incoming,
1097                                     tt_buff, is_duplicate);
1098
1099         /* is single hop (direct) neighbor */
1100         if (is_single_hop_neigh) {
1101
1102                 /* mark direct link on incoming interface */
1103                 bat_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1104                                 1, if_incoming);
1105
1106                 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
1107                         "rebroadcast neighbor packet with direct link flag\n");
1108                 goto out_neigh;
1109         }
1110
1111         /* multihop originator */
1112         if (!is_bidirectional) {
1113                 bat_dbg(DBG_BATMAN, bat_priv,
1114                         "Drop packet: not received via bidirectional link\n");
1115                 goto out_neigh;
1116         }
1117
1118         if (is_duplicate) {
1119                 bat_dbg(DBG_BATMAN, bat_priv,
1120                         "Drop packet: duplicate packet received\n");
1121                 goto out_neigh;
1122         }
1123
1124         bat_dbg(DBG_BATMAN, bat_priv,
1125                 "Forwarding packet: rebroadcast originator packet\n");
1126         bat_ogm_forward(orig_node, ethhdr, batman_ogm_packet, 0, if_incoming);
1127
1128 out_neigh:
1129         if ((orig_neigh_node) && (!is_single_hop_neigh))
1130                 orig_node_free_ref(orig_neigh_node);
1131 out:
1132         if (router)
1133                 neigh_node_free_ref(router);
1134         if (router_router)
1135                 neigh_node_free_ref(router_router);
1136         if (orig_neigh_router)
1137                 neigh_node_free_ref(orig_neigh_router);
1138
1139         orig_node_free_ref(orig_node);
1140 }
1141
1142 void bat_ogm_receive(const struct ethhdr *ethhdr, unsigned char *packet_buff,
1143                      int packet_len, struct hard_iface *if_incoming)
1144 {
1145         struct batman_ogm_packet *batman_ogm_packet;
1146         int buff_pos = 0;
1147         unsigned char *tt_buff;
1148
1149         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
1150
1151         /* unpack the aggregated packets and process them one by one */
1152         do {
1153                 /* network to host order for our 32bit seqno and the
1154                    orig_interval */
1155                 batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);
1156                 batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);
1157
1158                 tt_buff = packet_buff + buff_pos + BATMAN_OGM_LEN;
1159
1160                 bat_ogm_process(ethhdr, batman_ogm_packet,
1161                                 tt_buff, if_incoming);
1162
1163                 buff_pos += BATMAN_OGM_LEN +
1164                                 tt_len(batman_ogm_packet->tt_num_changes);
1165
1166                 batman_ogm_packet = (struct batman_ogm_packet *)
1167                                                 (packet_buff + buff_pos);
1168         } while (bat_ogm_aggr_packet(buff_pos, packet_len,
1169                                      batman_ogm_packet->tt_num_changes));
1170 }