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 struct neigh_node *bat_iv_ogm_neigh_new(struct hard_iface *hard_iface,
  34                                                const uint8_t *neigh_addr,
  35                                                struct orig_node *orig_node,
  36                                                struct orig_node *orig_neigh,
  37                                                uint32_t seqno)
  38 {
  39         struct neigh_node *neigh_node;
  40
  41         neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, seqno);
  42         if (!neigh_node)
  43                 goto out;
  44
  45         INIT_LIST_HEAD(&neigh_node->bonding_list);
  46         spin_lock_init(&neigh_node->tq_lock);
  47
  48         neigh_node->orig_node = orig_neigh;
  49         neigh_node->if_incoming = hard_iface;
  50
  51         spin_lock_bh(&orig_node->neigh_list_lock);
  52         hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
  53         spin_unlock_bh(&orig_node->neigh_list_lock);
  54
  55 out:
  56         return neigh_node;
  57 }
  58
  59 static int bat_iv_ogm_iface_enable(struct hard_iface *hard_iface)
  60 {
  61         struct batman_ogm_packet *batman_ogm_packet;
  62         uint32_t random_seqno;
  63         int res = -1;
  64
  65         /* randomize initial seqno to avoid collision */
  66         get_random_bytes(&random_seqno, sizeof(random_seqno));
  67         atomic_set(&hard_iface->seqno, random_seqno);
  68
  69         hard_iface->packet_len = BATMAN_OGM_HLEN;
  70         hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
  71
  72         if (!hard_iface->packet_buff)
  73                 goto out;
  74
  75         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  76         batman_ogm_packet->header.packet_type = BAT_IV_OGM;
  77         batman_ogm_packet->header.version = COMPAT_VERSION;
  78         batman_ogm_packet->header.ttl = 2;
  79         batman_ogm_packet->flags = NO_FLAGS;
  80         batman_ogm_packet->tq = TQ_MAX_VALUE;
  81         batman_ogm_packet->tt_num_changes = 0;
  82         batman_ogm_packet->ttvn = 0;
  83
  84         res = 0;
  85
  86 out:
  87         return res;
  88 }
  89
  90 static void bat_iv_ogm_iface_disable(struct hard_iface *hard_iface)
  91 {
  92         kfree(hard_iface->packet_buff);
  93         hard_iface->packet_buff = NULL;
  94 }
  95
  96 static void bat_iv_ogm_iface_update_mac(struct hard_iface *hard_iface)
  97 {
  98         struct batman_ogm_packet *batman_ogm_packet;
  99
 100         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
 101         memcpy(batman_ogm_packet->orig,
 102                hard_iface->net_dev->dev_addr, ETH_ALEN);
 103         memcpy(batman_ogm_packet->prev_sender,
 104                hard_iface->net_dev->dev_addr, ETH_ALEN);
 105 }
 106
 107 static void bat_iv_ogm_primary_iface_set(struct hard_iface *hard_iface)
 108 {
 109         struct batman_ogm_packet *batman_ogm_packet;
 110
 111         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
 112         batman_ogm_packet->flags = PRIMARIES_FIRST_HOP;
 113         batman_ogm_packet->header.ttl = TTL;
 114 }
 115
 116 /* when do we schedule our own ogm to be sent */
 117 static unsigned long bat_iv_ogm_emit_send_time(const struct bat_priv *bat_priv)
 118 {
 119         return jiffies + msecs_to_jiffies(
 120                    atomic_read(&bat_priv->orig_interval) -
 121                    JITTER + (random32() % 2*JITTER));
 122 }
 123
 124 /* when do we schedule a ogm packet to be sent */
 125 static unsigned long bat_iv_ogm_fwd_send_time(void)
 126 {
 127         return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
 128 }
 129
 130 /* apply hop penalty for a normal link */
 131 static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
 132 {
 133         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 134         return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
 135 }
 136
 137 /* is there another aggregated packet here? */
 138 static int bat_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 139                                   int tt_num_changes)
 140 {
 141         int next_buff_pos = buff_pos + BATMAN_OGM_HLEN + tt_len(tt_num_changes);
 142
 143         return (next_buff_pos <= packet_len) &&
 144                 (next_buff_pos <= MAX_AGGREGATION_BYTES);
 145 }
 146
 147 /* send a batman ogm to a given interface */
 148 static void bat_iv_ogm_send_to_if(struct forw_packet *forw_packet,
 149                                   struct hard_iface *hard_iface)
 150 {
 151         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 152         char *fwd_str;
 153         uint8_t packet_num;
 154         int16_t buff_pos;
 155         struct batman_ogm_packet *batman_ogm_packet;
 156         struct sk_buff *skb;
 157
 158         if (hard_iface->if_status != IF_ACTIVE)
 159                 return;
 160
 161         packet_num = 0;
 162         buff_pos = 0;
 163         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 164
 165         /* adjust all flags and log packets */
 166         while (bat_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 167                                       batman_ogm_packet->tt_num_changes)) {
 168
 169                 /* we might have aggregated direct link packets with an
 170                  * ordinary base packet */
 171                 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
 172                     (forw_packet->if_incoming == hard_iface))
 173                         batman_ogm_packet->flags |= DIRECTLINK;
 174                 else
 175                         batman_ogm_packet->flags &= ~DIRECTLINK;
 176
 177                 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
 178                                                             "Sending own" :
 179                                                             "Forwarding"));
 180                 bat_dbg(DBG_BATMAN, bat_priv,
 181                         "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
 182                         fwd_str, (packet_num > 0 ? "aggregated " : ""),
 183                         batman_ogm_packet->orig,
 184                         ntohl(batman_ogm_packet->seqno),
 185                         batman_ogm_packet->tq, batman_ogm_packet->header.ttl,
 186                         (batman_ogm_packet->flags & DIRECTLINK ?
 187                          "on" : "off"),
 188                         batman_ogm_packet->ttvn, hard_iface->net_dev->name,
 189                         hard_iface->net_dev->dev_addr);
 190
 191                 buff_pos += BATMAN_OGM_HLEN +
 192                                 tt_len(batman_ogm_packet->tt_num_changes);
 193                 packet_num++;
 194                 batman_ogm_packet = (struct batman_ogm_packet *)
 195                                         (forw_packet->skb->data + buff_pos);
 196         }
 197
 198         /* create clone because function is called more than once */
 199         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 200         if (skb)
 201                 send_skb_packet(skb, hard_iface, broadcast_addr);
 202 }
 203
 204 /* send a batman ogm packet */
 205 static void bat_iv_ogm_emit(struct forw_packet *forw_packet)
 206 {
 207         struct hard_iface *hard_iface;
 208         struct net_device *soft_iface;
 209         struct bat_priv *bat_priv;
 210         struct hard_iface *primary_if = NULL;
 211         struct batman_ogm_packet *batman_ogm_packet;
 212         unsigned char directlink;
 213
 214         batman_ogm_packet = (struct batman_ogm_packet *)
 215                                                 (forw_packet->skb->data);
 216         directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 217
 218         if (!forw_packet->if_incoming) {
 219                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 220                 goto out;
 221         }
 222
 223         soft_iface = forw_packet->if_incoming->soft_iface;
 224         bat_priv = netdev_priv(soft_iface);
 225
 226         if (forw_packet->if_incoming->if_status != IF_ACTIVE)
 227                 goto out;
 228
 229         primary_if = primary_if_get_selected(bat_priv);
 230         if (!primary_if)
 231                 goto out;
 232
 233         /* multihomed peer assumed */
 234         /* non-primary OGMs are only broadcasted on their interface */
 235         if ((directlink && (batman_ogm_packet->header.ttl == 1)) ||
 236             (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
 237
 238                 /* FIXME: what about aggregated packets ? */
 239                 bat_dbg(DBG_BATMAN, bat_priv,
 240                         "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
 241                         (forw_packet->own ? "Sending own" : "Forwarding"),
 242                         batman_ogm_packet->orig,
 243                         ntohl(batman_ogm_packet->seqno),
 244                         batman_ogm_packet->header.ttl,
 245                         forw_packet->if_incoming->net_dev->name,
 246                         forw_packet->if_incoming->net_dev->dev_addr);
 247
 248                 /* skb is only used once and than forw_packet is free'd */
 249                 send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
 250                                 broadcast_addr);
 251                 forw_packet->skb = NULL;
 252
 253                 goto out;
 254         }
 255
 256         /* broadcast on every interface */
 257         rcu_read_lock();
 258         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 259                 if (hard_iface->soft_iface != soft_iface)
 260                         continue;
 261
 262                 bat_iv_ogm_send_to_if(forw_packet, hard_iface);
 263         }
 264         rcu_read_unlock();
 265
 266 out:
 267         if (primary_if)
 268                 hardif_free_ref(primary_if);
 269 }
 270
 271 /* return true if new_packet can be aggregated with forw_packet */
 272 static bool bat_iv_ogm_can_aggregate(const struct batman_ogm_packet
 273                                                         *new_batman_ogm_packet,
 274                                      struct bat_priv *bat_priv,
 275                                      int packet_len, unsigned long send_time,
 276                                      bool directlink,
 277                                      const struct hard_iface *if_incoming,
 278                                      const struct forw_packet *forw_packet)
 279 {
 280         struct batman_ogm_packet *batman_ogm_packet;
 281         int aggregated_bytes = forw_packet->packet_len + packet_len;
 282         struct hard_iface *primary_if = NULL;
 283         bool res = false;
 284
 285         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 286
 287         /**
 288          * we can aggregate the current packet to this aggregated packet
 289          * if:
 290          *
 291          * - the send time is within our MAX_AGGREGATION_MS time
 292          * - the resulting packet wont be bigger than
 293          *   MAX_AGGREGATION_BYTES
 294          */
 295
 296         if (time_before(send_time, forw_packet->send_time) &&
 297             time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
 298                                         forw_packet->send_time) &&
 299             (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
 300
 301                 /**
 302                  * check aggregation compatibility
 303                  * -> direct link packets are broadcasted on
 304                  *    their interface only
 305                  * -> aggregate packet if the current packet is
 306                  *    a "global" packet as well as the base
 307                  *    packet
 308                  */
 309
 310                 primary_if = primary_if_get_selected(bat_priv);
 311                 if (!primary_if)
 312                         goto out;
 313
 314                 /* packets without direct link flag and high TTL
 315                  * are flooded through the net  */
 316                 if ((!directlink) &&
 317                     (!(batman_ogm_packet->flags & DIRECTLINK)) &&
 318                     (batman_ogm_packet->header.ttl != 1) &&
 319
 320                     /* own packets originating non-primary
 321                      * interfaces leave only that interface */
 322                     ((!forw_packet->own) ||
 323                      (forw_packet->if_incoming == primary_if))) {
 324                         res = true;
 325                         goto out;
 326                 }
 327
 328                 /* if the incoming packet is sent via this one
 329                  * interface only - we still can aggregate */
 330                 if ((directlink) &&
 331                     (new_batman_ogm_packet->header.ttl == 1) &&
 332                     (forw_packet->if_incoming == if_incoming) &&
 333
 334                     /* packets from direct neighbors or
 335                      * own secondary interface packets
 336                      * (= secondary interface packets in general) */
 337                     (batman_ogm_packet->flags & DIRECTLINK ||
 338                      (forw_packet->own &&
 339                       forw_packet->if_incoming != primary_if))) {
 340                         res = true;
 341                         goto out;
 342                 }
 343         }
 344
 345 out:
 346         if (primary_if)
 347                 hardif_free_ref(primary_if);
 348         return res;
 349 }
 350
 351 /* create a new aggregated packet and add this packet to it */
 352 static void bat_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 353                                      int packet_len, unsigned long send_time,
 354                                      bool direct_link,
 355                                      struct hard_iface *if_incoming,
 356                                      int own_packet)
 357 {
 358         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 359         struct forw_packet *forw_packet_aggr;
 360         unsigned char *skb_buff;
 361
 362         if (!atomic_inc_not_zero(&if_incoming->refcount))
 363                 return;
 364
 365         /* own packet should always be scheduled */
 366         if (!own_packet) {
 367                 if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 368                         bat_dbg(DBG_BATMAN, bat_priv,
 369                                 "batman packet queue full\n");
 370                         goto out;
 371                 }
 372         }
 373
 374         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 375         if (!forw_packet_aggr) {
 376                 if (!own_packet)
 377                         atomic_inc(&bat_priv->batman_queue_left);
 378                 goto out;
 379         }
 380
 381         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 382             (packet_len < MAX_AGGREGATION_BYTES))
 383                 forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
 384                                                       ETH_HLEN);
 385         else
 386                 forw_packet_aggr->skb = dev_alloc_skb(packet_len + ETH_HLEN);
 387
 388         if (!forw_packet_aggr->skb) {
 389                 if (!own_packet)
 390                         atomic_inc(&bat_priv->batman_queue_left);
 391                 kfree(forw_packet_aggr);
 392                 goto out;
 393         }
 394         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 395
 396         INIT_HLIST_NODE(&forw_packet_aggr->list);
 397
 398         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 399         forw_packet_aggr->packet_len = packet_len;
 400         memcpy(skb_buff, packet_buff, packet_len);
 401
 402         forw_packet_aggr->own = own_packet;
 403         forw_packet_aggr->if_incoming = if_incoming;
 404         forw_packet_aggr->num_packets = 0;
 405         forw_packet_aggr->direct_link_flags = NO_FLAGS;
 406         forw_packet_aggr->send_time = send_time;
 407
 408         /* save packet direct link flag status */
 409         if (direct_link)
 410                 forw_packet_aggr->direct_link_flags |= 1;
 411
 412         /* add new packet to packet list */
 413         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 414         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 415         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 416
 417         /* start timer for this packet */
 418         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 419                           send_outstanding_bat_ogm_packet);
 420         queue_delayed_work(bat_event_workqueue,
 421                            &forw_packet_aggr->delayed_work,
 422                            send_time - jiffies);
 423
 424         return;
 425 out:
 426         hardif_free_ref(if_incoming);
 427 }
 428
 429 /* aggregate a new packet into the existing ogm packet */
 430 static void bat_iv_ogm_aggregate(struct forw_packet *forw_packet_aggr,
 431                                  const unsigned char *packet_buff,
 432                                  int packet_len, bool direct_link)
 433 {
 434         unsigned char *skb_buff;
 435
 436         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 437         memcpy(skb_buff, packet_buff, packet_len);
 438         forw_packet_aggr->packet_len += packet_len;
 439         forw_packet_aggr->num_packets++;
 440
 441         /* save packet direct link flag status */
 442         if (direct_link)
 443                 forw_packet_aggr->direct_link_flags |=
 444                         (1 << forw_packet_aggr->num_packets);
 445 }
 446
 447 static void bat_iv_ogm_queue_add(struct bat_priv *bat_priv,
 448                                  unsigned char *packet_buff,
 449                                  int packet_len, struct hard_iface *if_incoming,
 450                                  int own_packet, unsigned long send_time)
 451 {
 452         /**
 453          * _aggr -> pointer to the packet we want to aggregate with
 454          * _pos -> pointer to the position in the queue
 455          */
 456         struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
 457         struct hlist_node *tmp_node;
 458         struct batman_ogm_packet *batman_ogm_packet;
 459         bool direct_link;
 460
 461         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
 462         direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0;
 463
 464         /* find position for the packet in the forward queue */
 465         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 466         /* own packets are not to be aggregated */
 467         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 468                 hlist_for_each_entry(forw_packet_pos, tmp_node,
 469                                      &bat_priv->forw_bat_list, list) {
 470                         if (bat_iv_ogm_can_aggregate(batman_ogm_packet,
 471                                                      bat_priv, packet_len,
 472                                                      send_time, direct_link,
 473                                                      if_incoming,
 474                                                      forw_packet_pos)) {
 475                                 forw_packet_aggr = forw_packet_pos;
 476                                 break;
 477                         }
 478                 }
 479         }
 480
 481         /* nothing to aggregate with - either aggregation disabled or no
 482          * suitable aggregation packet found */
 483         if (!forw_packet_aggr) {
 484                 /* the following section can run without the lock */
 485                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 486
 487                 /**
 488                  * if we could not aggregate this packet with one of the others
 489                  * we hold it back for a while, so that it might be aggregated
 490                  * later on
 491                  */
 492                 if ((!own_packet) &&
 493                     (atomic_read(&bat_priv->aggregated_ogms)))
 494                         send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
 495
 496                 bat_iv_ogm_aggregate_new(packet_buff, packet_len,
 497                                          send_time, direct_link,
 498                                          if_incoming, own_packet);
 499         } else {
 500                 bat_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 501                                      packet_len, direct_link);
 502                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 503         }
 504 }
 505
 506 static void bat_iv_ogm_forward(struct orig_node *orig_node,
 507                                const struct ethhdr *ethhdr,
 508                                struct batman_ogm_packet *batman_ogm_packet,
 509                                bool is_single_hop_neigh,
 510                                struct hard_iface *if_incoming)
 511 {
 512         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 513         struct neigh_node *router;
 514         uint8_t in_tq, in_ttl, tq_avg = 0;
 515         uint8_t tt_num_changes;
 516
 517         if (batman_ogm_packet->header.ttl <= 1) {
 518                 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
 519                 return;
 520         }
 521
 522         router = orig_node_get_router(orig_node);
 523
 524         in_tq = batman_ogm_packet->tq;
 525         in_ttl = batman_ogm_packet->header.ttl;
 526         tt_num_changes = batman_ogm_packet->tt_num_changes;
 527
 528         batman_ogm_packet->header.ttl--;
 529         memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 530
 531         /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
 532          * of our best tq value */
 533         if (router && router->tq_avg != 0) {
 534
 535                 /* rebroadcast ogm of best ranking neighbor as is */
 536                 if (!compare_eth(router->addr, ethhdr->h_source)) {
 537                         batman_ogm_packet->tq = router->tq_avg;
 538
 539                         if (router->last_ttl)
 540                                 batman_ogm_packet->header.ttl =
 541                                         router->last_ttl - 1;
 542                 }
 543
 544                 tq_avg = router->tq_avg;
 545         }
 546
 547         if (router)
 548                 neigh_node_free_ref(router);
 549
 550         /* apply hop penalty */
 551         batman_ogm_packet->tq = hop_penalty(batman_ogm_packet->tq, bat_priv);
 552
 553         bat_dbg(DBG_BATMAN, bat_priv,
 554                 "Forwarding packet: tq_orig: %i, tq_avg: %i, tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
 555                 in_tq, tq_avg, batman_ogm_packet->tq, in_ttl - 1,
 556                 batman_ogm_packet->header.ttl);
 557
 558         batman_ogm_packet->seqno = htonl(batman_ogm_packet->seqno);
 559         batman_ogm_packet->tt_crc = htons(batman_ogm_packet->tt_crc);
 560
 561         /* switch of primaries first hop flag when forwarding */
 562         batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP;
 563         if (is_single_hop_neigh)
 564                 batman_ogm_packet->flags |= DIRECTLINK;
 565         else
 566                 batman_ogm_packet->flags &= ~DIRECTLINK;
 567
 568         bat_iv_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet,
 569                              BATMAN_OGM_HLEN + tt_len(tt_num_changes),
 570                              if_incoming, 0, bat_iv_ogm_fwd_send_time());
 571 }
 572
 573 static void bat_iv_ogm_schedule(struct hard_iface *hard_iface,
 574                                 int tt_num_changes)
 575 {
 576         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 577         struct batman_ogm_packet *batman_ogm_packet;
 578         struct hard_iface *primary_if;
 579         int vis_server;
 580
 581         vis_server = atomic_read(&bat_priv->vis_mode);
 582         primary_if = primary_if_get_selected(bat_priv);
 583
 584         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
 585
 586         /* change sequence number to network order */
 587         batman_ogm_packet->seqno =
 588                         htonl((uint32_t)atomic_read(&hard_iface->seqno));
 589
 590         batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn);
 591         batman_ogm_packet->tt_crc = htons((uint16_t)
 592                                                 atomic_read(&bat_priv->tt_crc));
 593         if (tt_num_changes >= 0)
 594                 batman_ogm_packet->tt_num_changes = tt_num_changes;
 595
 596         if (vis_server == VIS_TYPE_SERVER_SYNC)
 597                 batman_ogm_packet->flags |= VIS_SERVER;
 598         else
 599                 batman_ogm_packet->flags &= ~VIS_SERVER;
 600
 601         if ((hard_iface == primary_if) &&
 602             (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
 603                 batman_ogm_packet->gw_flags =
 604                                 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 605         else
 606                 batman_ogm_packet->gw_flags = NO_FLAGS;
 607
 608         atomic_inc(&hard_iface->seqno);
 609
 610         slide_own_bcast_window(hard_iface);
 611         bat_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff,
 612                              hard_iface->packet_len, hard_iface, 1,
 613                              bat_iv_ogm_emit_send_time(bat_priv));
 614
 615         if (primary_if)
 616                 hardif_free_ref(primary_if);
 617 }
 618
 619 static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv,
 620                                    struct orig_node *orig_node,
 621                                    const struct ethhdr *ethhdr,
 622                                    const struct batman_ogm_packet
 623                                                         *batman_ogm_packet,
 624                                    struct hard_iface *if_incoming,
 625                                    const unsigned char *tt_buff,
 626                                    int is_duplicate)
 627 {
 628         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 629         struct neigh_node *router = NULL;
 630         struct orig_node *orig_node_tmp;
 631         struct hlist_node *node;
 632         uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
 633
 634         bat_dbg(DBG_BATMAN, bat_priv,
 635                 "update_originator(): Searching and updating originator entry of received packet\n");
 636
 637         rcu_read_lock();
 638         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 639                                  &orig_node->neigh_list, list) {
 640                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 641                     (tmp_neigh_node->if_incoming == if_incoming) &&
 642                      atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 643                         if (neigh_node)
 644                                 neigh_node_free_ref(neigh_node);
 645                         neigh_node = tmp_neigh_node;
 646                         continue;
 647                 }
 648
 649                 if (is_duplicate)
 650                         continue;
 651
 652                 spin_lock_bh(&tmp_neigh_node->tq_lock);
 653                 ring_buffer_set(tmp_neigh_node->tq_recv,
 654                                 &tmp_neigh_node->tq_index, 0);
 655                 tmp_neigh_node->tq_avg =
 656                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 657                 spin_unlock_bh(&tmp_neigh_node->tq_lock);
 658         }
 659
 660         if (!neigh_node) {
 661                 struct orig_node *orig_tmp;
 662
 663                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 664                 if (!orig_tmp)
 665                         goto unlock;
 666
 667                 neigh_node = bat_iv_ogm_neigh_new(if_incoming, ethhdr->h_source,
 668                                                   orig_node, orig_tmp,
 669                                                   batman_ogm_packet->seqno);
 670
 671                 orig_node_free_ref(orig_tmp);
 672                 if (!neigh_node)
 673                         goto unlock;
 674         } else
 675                 bat_dbg(DBG_BATMAN, bat_priv,
 676                         "Updating existing last-hop neighbor of originator\n");
 677
 678         rcu_read_unlock();
 679
 680         orig_node->flags = batman_ogm_packet->flags;
 681         neigh_node->last_seen = jiffies;
 682
 683         spin_lock_bh(&neigh_node->tq_lock);
 684         ring_buffer_set(neigh_node->tq_recv,
 685                         &neigh_node->tq_index,
 686                         batman_ogm_packet->tq);
 687         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 688         spin_unlock_bh(&neigh_node->tq_lock);
 689
 690         if (!is_duplicate) {
 691                 orig_node->last_ttl = batman_ogm_packet->header.ttl;
 692                 neigh_node->last_ttl = batman_ogm_packet->header.ttl;
 693         }
 694
 695         bonding_candidate_add(orig_node, neigh_node);
 696
 697         /* if this neighbor already is our next hop there is nothing
 698          * to change */
 699         router = orig_node_get_router(orig_node);
 700         if (router == neigh_node)
 701                 goto update_tt;
 702
 703         /* if this neighbor does not offer a better TQ we won't consider it */
 704         if (router && (router->tq_avg > neigh_node->tq_avg))
 705                 goto update_tt;
 706
 707         /* if the TQ is the same and the link not more symmetric we
 708          * won't consider it either */
 709         if (router && (neigh_node->tq_avg == router->tq_avg)) {
 710                 orig_node_tmp = router->orig_node;
 711                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 712                 bcast_own_sum_orig =
 713                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 714                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 715
 716                 orig_node_tmp = neigh_node->orig_node;
 717                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 718                 bcast_own_sum_neigh =
 719                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 720                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 721
 722                 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
 723                         goto update_tt;
 724         }
 725
 726         update_route(bat_priv, orig_node, neigh_node);
 727
 728 update_tt:
 729         /* I have to check for transtable changes only if the OGM has been
 730          * sent through a primary interface */
 731         if (((batman_ogm_packet->orig != ethhdr->h_source) &&
 732              (batman_ogm_packet->header.ttl > 2)) ||
 733             (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
 734                 tt_update_orig(bat_priv, orig_node, tt_buff,
 735                                batman_ogm_packet->tt_num_changes,
 736                                batman_ogm_packet->ttvn,
 737                                batman_ogm_packet->tt_crc);
 738
 739         if (orig_node->gw_flags != batman_ogm_packet->gw_flags)
 740                 gw_node_update(bat_priv, orig_node,
 741                                batman_ogm_packet->gw_flags);
 742
 743         orig_node->gw_flags = batman_ogm_packet->gw_flags;
 744
 745         /* restart gateway selection if fast or late switching was enabled */
 746         if ((orig_node->gw_flags) &&
 747             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 748             (atomic_read(&bat_priv->gw_sel_class) > 2))
 749                 gw_check_election(bat_priv, orig_node);
 750
 751         goto out;
 752
 753 unlock:
 754         rcu_read_unlock();
 755 out:
 756         if (neigh_node)
 757                 neigh_node_free_ref(neigh_node);
 758         if (router)
 759                 neigh_node_free_ref(router);
 760 }
 761
 762 static int bat_iv_ogm_calc_tq(struct orig_node *orig_node,
 763                               struct orig_node *orig_neigh_node,
 764                               struct batman_ogm_packet *batman_ogm_packet,
 765                               struct hard_iface *if_incoming)
 766 {
 767         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 768         struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
 769         struct hlist_node *node;
 770         uint8_t total_count;
 771         uint8_t orig_eq_count, neigh_rq_count, tq_own;
 772         int tq_asym_penalty, ret = 0;
 773
 774         /* find corresponding one hop neighbor */
 775         rcu_read_lock();
 776         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 777                                  &orig_neigh_node->neigh_list, list) {
 778
 779                 if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
 780                         continue;
 781
 782                 if (tmp_neigh_node->if_incoming != if_incoming)
 783                         continue;
 784
 785                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 786                         continue;
 787
 788                 neigh_node = tmp_neigh_node;
 789                 break;
 790         }
 791         rcu_read_unlock();
 792
 793         if (!neigh_node)
 794                 neigh_node = bat_iv_ogm_neigh_new(if_incoming,
 795                                                   orig_neigh_node->orig,
 796                                                   orig_neigh_node,
 797                                                   orig_neigh_node,
 798                                                   batman_ogm_packet->seqno);
 799
 800         if (!neigh_node)
 801                 goto out;
 802
 803         /* if orig_node is direct neighbor update neigh_node last_seen */
 804         if (orig_node == orig_neigh_node)
 805                 neigh_node->last_seen = jiffies;
 806
 807         orig_node->last_seen = jiffies;
 808
 809         /* find packet count of corresponding one hop neighbor */
 810         spin_lock_bh(&orig_node->ogm_cnt_lock);
 811         orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
 812         neigh_rq_count = neigh_node->real_packet_count;
 813         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 814
 815         /* pay attention to not get a value bigger than 100 % */
 816         total_count = (orig_eq_count > neigh_rq_count ?
 817                        neigh_rq_count : orig_eq_count);
 818
 819         /* if we have too few packets (too less data) we set tq_own to zero */
 820         /* if we receive too few packets it is not considered bidirectional */
 821         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 822             (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 823                 tq_own = 0;
 824         else
 825                 /* neigh_node->real_packet_count is never zero as we
 826                  * only purge old information when getting new
 827                  * information */
 828                 tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
 829
 830         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 831          * affect the nearly-symmetric links only a little, but
 832          * punishes asymmetric links more.  This will give a value
 833          * between 0 and TQ_MAX_VALUE
 834          */
 835         tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
 836                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 837                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 838                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
 839                                         (TQ_LOCAL_WINDOW_SIZE *
 840                                          TQ_LOCAL_WINDOW_SIZE *
 841                                          TQ_LOCAL_WINDOW_SIZE);
 842
 843         batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own
 844                                                         * tq_asym_penalty) /
 845                                                 (TQ_MAX_VALUE * TQ_MAX_VALUE));
 846
 847         bat_dbg(DBG_BATMAN, bat_priv,
 848                 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
 849                 orig_node->orig, orig_neigh_node->orig, total_count,
 850                 neigh_rq_count, tq_own, tq_asym_penalty, batman_ogm_packet->tq);
 851
 852         /* if link has the minimum required transmission quality
 853          * consider it bidirectional */
 854         if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 855                 ret = 1;
 856
 857 out:
 858         if (neigh_node)
 859                 neigh_node_free_ref(neigh_node);
 860         return ret;
 861 }
 862
 863 /* processes a batman packet for all interfaces, adjusts the sequence number and
 864  * finds out whether it is a duplicate.
 865  * returns:
 866  *   1 the packet is a duplicate
 867  *   0 the packet has not yet been received
 868  *  -1 the packet is old and has been received while the seqno window
 869  *     was protected. Caller should drop it.
 870  */
 871 static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
 872                                     const struct batman_ogm_packet
 873                                                         *batman_ogm_packet,
 874                                     const struct hard_iface *if_incoming)
 875 {
 876         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 877         struct orig_node *orig_node;
 878         struct neigh_node *tmp_neigh_node;
 879         struct hlist_node *node;
 880         int is_duplicate = 0;
 881         int32_t seq_diff;
 882         int need_update = 0;
 883         int set_mark, ret = -1;
 884
 885         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
 886         if (!orig_node)
 887                 return 0;
 888
 889         spin_lock_bh(&orig_node->ogm_cnt_lock);
 890         seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;
 891
 892         /* signalize caller that the packet is to be dropped. */
 893         if (!hlist_empty(&orig_node->neigh_list) &&
 894             window_protected(bat_priv, seq_diff,
 895                              &orig_node->batman_seqno_reset))
 896                 goto out;
 897
 898         rcu_read_lock();
 899         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 900                                  &orig_node->neigh_list, list) {
 901
 902                 is_duplicate |= bat_test_bit(tmp_neigh_node->real_bits,
 903                                              orig_node->last_real_seqno,
 904                                              batman_ogm_packet->seqno);
 905
 906                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 907                     (tmp_neigh_node->if_incoming == if_incoming))
 908                         set_mark = 1;
 909                 else
 910                         set_mark = 0;
 911
 912                 /* if the window moved, set the update flag. */
 913                 need_update |= bit_get_packet(bat_priv,
 914                                               tmp_neigh_node->real_bits,
 915                                               seq_diff, set_mark);
 916
 917                 tmp_neigh_node->real_packet_count =
 918                         bitmap_weight(tmp_neigh_node->real_bits,
 919                                       TQ_LOCAL_WINDOW_SIZE);
 920         }
 921         rcu_read_unlock();
 922
 923         if (need_update) {
 924                 bat_dbg(DBG_BATMAN, bat_priv,
 925                         "updating last_seqno: old %u, new %u\n",
 926                         orig_node->last_real_seqno, batman_ogm_packet->seqno);
 927                 orig_node->last_real_seqno = batman_ogm_packet->seqno;
 928         }
 929
 930         ret = is_duplicate;
 931
 932 out:
 933         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 934         orig_node_free_ref(orig_node);
 935         return ret;
 936 }
 937
 938 static void bat_iv_ogm_process(const struct ethhdr *ethhdr,
 939                                struct batman_ogm_packet *batman_ogm_packet,
 940                                const unsigned char *tt_buff,
 941                                struct hard_iface *if_incoming)
 942 {
 943         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 944         struct hard_iface *hard_iface;
 945         struct orig_node *orig_neigh_node, *orig_node;
 946         struct neigh_node *router = NULL, *router_router = NULL;
 947         struct neigh_node *orig_neigh_router = NULL;
 948         int has_directlink_flag;
 949         int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 950         int is_broadcast = 0, is_bidirectional;
 951         bool is_single_hop_neigh = false;
 952         int is_duplicate;
 953         uint32_t if_incoming_seqno;
 954
 955         /* Silently drop when the batman packet is actually not a
 956          * correct packet.
 957          *
 958          * This might happen if a packet is padded (e.g. Ethernet has a
 959          * minimum frame length of 64 byte) and the aggregation interprets
 960          * it as an additional length.
 961          *
 962          * TODO: A more sane solution would be to have a bit in the
 963          * batman_ogm_packet to detect whether the packet is the last
 964          * packet in an aggregation.  Here we expect that the padding
 965          * is always zero (or not 0x01)
 966          */
 967         if (batman_ogm_packet->header.packet_type != BAT_IV_OGM)
 968                 return;
 969
 970         /* could be changed by schedule_own_packet() */
 971         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 972
 973         has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 974
 975         if (compare_eth(ethhdr->h_source, batman_ogm_packet->orig))
 976                 is_single_hop_neigh = true;
 977
 978         bat_dbg(DBG_BATMAN, bat_priv,
 979                 "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",
 980                 ethhdr->h_source, if_incoming->net_dev->name,
 981                 if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,
 982                 batman_ogm_packet->prev_sender, batman_ogm_packet->seqno,
 983                 batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc,
 984                 batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,
 985                 batman_ogm_packet->header.ttl,
 986                 batman_ogm_packet->header.version, has_directlink_flag);
 987
 988         rcu_read_lock();
 989         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 990                 if (hard_iface->if_status != IF_ACTIVE)
 991                         continue;
 992
 993                 if (hard_iface->soft_iface != if_incoming->soft_iface)
 994                         continue;
 995
 996                 if (compare_eth(ethhdr->h_source,
 997                                 hard_iface->net_dev->dev_addr))
 998                         is_my_addr = 1;
 999
1000                 if (compare_eth(batman_ogm_packet->orig,
1001                                 hard_iface->net_dev->dev_addr))
1002                         is_my_orig = 1;
1003
1004                 if (compare_eth(batman_ogm_packet->prev_sender,
1005                                 hard_iface->net_dev->dev_addr))
1006                         is_my_oldorig = 1;
1007
1008                 if (is_broadcast_ether_addr(ethhdr->h_source))
1009                         is_broadcast = 1;
1010         }
1011         rcu_read_unlock();
1012
1013         if (batman_ogm_packet->header.version != COMPAT_VERSION) {
1014                 bat_dbg(DBG_BATMAN, bat_priv,
1015                         "Drop packet: incompatible batman version (%i)\n",
1016                         batman_ogm_packet->header.version);
1017                 return;
1018         }
1019
1020         if (is_my_addr) {
1021                 bat_dbg(DBG_BATMAN, bat_priv,
1022                         "Drop packet: received my own broadcast (sender: %pM)\n",
1023                         ethhdr->h_source);
1024                 return;
1025         }
1026
1027         if (is_broadcast) {
1028                 bat_dbg(DBG_BATMAN, bat_priv,
1029                         "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1030                         ethhdr->h_source);
1031                 return;
1032         }
1033
1034         if (is_my_orig) {
1035                 unsigned long *word;
1036                 int offset;
1037
1038                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
1039                 if (!orig_neigh_node)
1040                         return;
1041
1042                 /* neighbor has to indicate direct link and it has to
1043                  * come via the corresponding interface */
1044                 /* save packet seqno for bidirectional check */
1045                 if (has_directlink_flag &&
1046                     compare_eth(if_incoming->net_dev->dev_addr,
1047                                 batman_ogm_packet->orig)) {
1048                         offset = if_incoming->if_num * NUM_WORDS;
1049
1050                         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1051                         word = &(orig_neigh_node->bcast_own[offset]);
1052                         bat_set_bit(word,
1053                                     if_incoming_seqno -
1054                                                 batman_ogm_packet->seqno - 2);
1055                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
1056                                 bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE);
1057                         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1058                 }
1059
1060                 bat_dbg(DBG_BATMAN, bat_priv,
1061                         "Drop packet: originator packet from myself (via neighbor)\n");
1062                 orig_node_free_ref(orig_neigh_node);
1063                 return;
1064         }
1065
1066         if (is_my_oldorig) {
1067                 bat_dbg(DBG_BATMAN, bat_priv,
1068                         "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1069                         ethhdr->h_source);
1070                 return;
1071         }
1072
1073         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
1074         if (!orig_node)
1075                 return;
1076
1077         is_duplicate = bat_iv_ogm_update_seqnos(ethhdr, batman_ogm_packet,
1078                                                 if_incoming);
1079
1080         if (is_duplicate == -1) {
1081                 bat_dbg(DBG_BATMAN, bat_priv,
1082                         "Drop packet: packet within seqno protection time (sender: %pM)\n",
1083                         ethhdr->h_source);
1084                 goto out;
1085         }
1086
1087         if (batman_ogm_packet->tq == 0) {
1088                 bat_dbg(DBG_BATMAN, bat_priv,
1089                         "Drop packet: originator packet with tq equal 0\n");
1090                 goto out;
1091         }
1092
1093         router = orig_node_get_router(orig_node);
1094         if (router)
1095                 router_router = orig_node_get_router(router->orig_node);
1096
1097         /* avoid temporary routing loops */
1098         if (router && router_router &&
1099             (compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&
1100             !(compare_eth(batman_ogm_packet->orig,
1101                           batman_ogm_packet->prev_sender)) &&
1102             (compare_eth(router->addr, router_router->addr))) {
1103                 bat_dbg(DBG_BATMAN, bat_priv,
1104                         "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1105                         ethhdr->h_source);
1106                 goto out;
1107         }
1108
1109         /* if sender is a direct neighbor the sender mac equals
1110          * originator mac */
1111         orig_neigh_node = (is_single_hop_neigh ?
1112                            orig_node :
1113                            get_orig_node(bat_priv, ethhdr->h_source));
1114         if (!orig_neigh_node)
1115                 goto out;
1116
1117         orig_neigh_router = orig_node_get_router(orig_neigh_node);
1118
1119         /* drop packet if sender is not a direct neighbor and if we
1120          * don't route towards it */
1121         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1122                 bat_dbg(DBG_BATMAN, bat_priv,
1123                         "Drop packet: OGM via unknown neighbor!\n");
1124                 goto out_neigh;
1125         }
1126
1127         is_bidirectional = bat_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1128                                               batman_ogm_packet, if_incoming);
1129
1130         bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet);
1131
1132         /* update ranking if it is not a duplicate or has the same
1133          * seqno and similar ttl as the non-duplicate */
1134         if (is_bidirectional &&
1135             (!is_duplicate ||
1136              ((orig_node->last_real_seqno == batman_ogm_packet->seqno) &&
1137               (orig_node->last_ttl - 3 <= batman_ogm_packet->header.ttl))))
1138                 bat_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1139                                        batman_ogm_packet, if_incoming,
1140                                        tt_buff, is_duplicate);
1141
1142         /* is single hop (direct) neighbor */
1143         if (is_single_hop_neigh) {
1144
1145                 /* mark direct link on incoming interface */
1146                 bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1147                                    is_single_hop_neigh, if_incoming);
1148
1149                 bat_dbg(DBG_BATMAN, bat_priv,
1150                         "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1151                 goto out_neigh;
1152         }
1153
1154         /* multihop originator */
1155         if (!is_bidirectional) {
1156                 bat_dbg(DBG_BATMAN, bat_priv,
1157                         "Drop packet: not received via bidirectional link\n");
1158                 goto out_neigh;
1159         }
1160
1161         if (is_duplicate) {
1162                 bat_dbg(DBG_BATMAN, bat_priv,
1163                         "Drop packet: duplicate packet received\n");
1164                 goto out_neigh;
1165         }
1166
1167         bat_dbg(DBG_BATMAN, bat_priv,
1168                 "Forwarding packet: rebroadcast originator packet\n");
1169         bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1170                            is_single_hop_neigh, if_incoming);
1171
1172 out_neigh:
1173         if ((orig_neigh_node) && (!is_single_hop_neigh))
1174                 orig_node_free_ref(orig_neigh_node);
1175 out:
1176         if (router)
1177                 neigh_node_free_ref(router);
1178         if (router_router)
1179                 neigh_node_free_ref(router_router);
1180         if (orig_neigh_router)
1181                 neigh_node_free_ref(orig_neigh_router);
1182
1183         orig_node_free_ref(orig_node);
1184 }
1185
1186 static int bat_iv_ogm_receive(struct sk_buff *skb,
1187                               struct hard_iface *if_incoming)
1188 {
1189         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1190         struct batman_ogm_packet *batman_ogm_packet;
1191         struct ethhdr *ethhdr;
1192         int buff_pos = 0, packet_len;
1193         unsigned char *tt_buff, *packet_buff;
1194         bool ret;
1195
1196         ret = check_management_packet(skb, if_incoming, BATMAN_OGM_HLEN);
1197         if (!ret)
1198                 return NET_RX_DROP;
1199
1200         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1201          * that does not have B.A.T.M.A.N. IV enabled ?
1202          */
1203         if (bat_priv->bat_algo_ops->bat_ogm_emit != bat_iv_ogm_emit)
1204                 return NET_RX_DROP;
1205
1206         packet_len = skb_headlen(skb);
1207         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1208         packet_buff = skb->data;
1209         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
1210
1211         /* unpack the aggregated packets and process them one by one */
1212         do {
1213                 /* network to host order for our 32bit seqno and the
1214                    orig_interval */
1215                 batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);
1216                 batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);
1217
1218                 tt_buff = packet_buff + buff_pos + BATMAN_OGM_HLEN;
1219
1220                 bat_iv_ogm_process(ethhdr, batman_ogm_packet,
1221                                    tt_buff, if_incoming);
1222
1223                 buff_pos += BATMAN_OGM_HLEN +
1224                                 tt_len(batman_ogm_packet->tt_num_changes);
1225
1226                 batman_ogm_packet = (struct batman_ogm_packet *)
1227                                                 (packet_buff + buff_pos);
1228         } while (bat_iv_ogm_aggr_packet(buff_pos, packet_len,
1229                                         batman_ogm_packet->tt_num_changes));
1230
1231         kfree_skb(skb);
1232         return NET_RX_SUCCESS;
1233 }
1234
1235 static struct bat_algo_ops batman_iv __read_mostly = {
1236         .name = "BATMAN IV",
1237         .bat_iface_enable = bat_iv_ogm_iface_enable,
1238         .bat_iface_disable = bat_iv_ogm_iface_disable,
1239         .bat_iface_update_mac = bat_iv_ogm_iface_update_mac,
1240         .bat_primary_iface_set = bat_iv_ogm_primary_iface_set,
1241         .bat_ogm_schedule = bat_iv_ogm_schedule,
1242         .bat_ogm_emit = bat_iv_ogm_emit,
1243 };
1244
1245 int __init bat_iv_init(void)
1246 {
1247         int ret;
1248
1249         /* batman originator packet */
1250         ret = recv_handler_register(BAT_IV_OGM, bat_iv_ogm_receive);
1251         if (ret < 0)
1252                 goto out;
1253
1254         ret = bat_algo_register(&batman_iv);
1255         if (ret < 0)
1256                 goto handler_unregister;
1257
1258         goto out;
1259
1260 handler_unregister:
1261         recv_handler_unregister(BAT_IV_OGM);
1262 out:
1263         return ret;
1264 }