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