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((uint16_t)
 579                                                 atomic_read(&bat_priv->tt_crc));
 580         if (tt_num_changes >= 0)
 581                 batman_ogm_packet->tt_num_changes = tt_num_changes;
 582
 583         if (vis_server == VIS_TYPE_SERVER_SYNC)
 584                 batman_ogm_packet->flags |= VIS_SERVER;
 585         else
 586                 batman_ogm_packet->flags &= ~VIS_SERVER;
 587
 588         if ((hard_iface == primary_if) &&
 589             (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
 590                 batman_ogm_packet->gw_flags =
 591                                 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 592         else
 593                 batman_ogm_packet->gw_flags = NO_FLAGS;
 594
 595         atomic_inc(&hard_iface->seqno);
 596
 597         slide_own_bcast_window(hard_iface);
 598         bat_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff,
 599                              hard_iface->packet_len, hard_iface, 1,
 600                              bat_iv_ogm_emit_send_time(bat_priv));
 601
 602         if (primary_if)
 603                 hardif_free_ref(primary_if);
 604 }
 605
 606 static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv,
 607                                    struct orig_node *orig_node,
 608                                    const struct ethhdr *ethhdr,
 609                                    const struct batman_ogm_packet
 610                                                         *batman_ogm_packet,
 611                                    struct hard_iface *if_incoming,
 612                                    const unsigned char *tt_buff,
 613                                    int is_duplicate)
 614 {
 615         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 616         struct neigh_node *router = NULL;
 617         struct orig_node *orig_node_tmp;
 618         struct hlist_node *node;
 619         uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
 620
 621         bat_dbg(DBG_BATMAN, bat_priv,
 622                 "update_originator(): Searching and updating originator entry of received packet\n");
 623
 624         rcu_read_lock();
 625         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 626                                  &orig_node->neigh_list, list) {
 627                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 628                     (tmp_neigh_node->if_incoming == if_incoming) &&
 629                      atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 630                         if (neigh_node)
 631                                 neigh_node_free_ref(neigh_node);
 632                         neigh_node = tmp_neigh_node;
 633                         continue;
 634                 }
 635
 636                 if (is_duplicate)
 637                         continue;
 638
 639                 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
 640                 ring_buffer_set(tmp_neigh_node->tq_recv,
 641                                 &tmp_neigh_node->tq_index, 0);
 642                 tmp_neigh_node->tq_avg =
 643                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 644                 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
 645         }
 646
 647         if (!neigh_node) {
 648                 struct orig_node *orig_tmp;
 649
 650                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 651                 if (!orig_tmp)
 652                         goto unlock;
 653
 654                 neigh_node = bat_iv_ogm_neigh_new(if_incoming, ethhdr->h_source,
 655                                                   orig_node, orig_tmp,
 656                                                   batman_ogm_packet->seqno);
 657
 658                 orig_node_free_ref(orig_tmp);
 659                 if (!neigh_node)
 660                         goto unlock;
 661         } else
 662                 bat_dbg(DBG_BATMAN, bat_priv,
 663                         "Updating existing last-hop neighbor of originator\n");
 664
 665         rcu_read_unlock();
 666
 667         orig_node->flags = batman_ogm_packet->flags;
 668         neigh_node->last_seen = jiffies;
 669
 670         spin_lock_bh(&neigh_node->lq_update_lock);
 671         ring_buffer_set(neigh_node->tq_recv,
 672                         &neigh_node->tq_index,
 673                         batman_ogm_packet->tq);
 674         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 675         spin_unlock_bh(&neigh_node->lq_update_lock);
 676
 677         if (!is_duplicate) {
 678                 orig_node->last_ttl = batman_ogm_packet->header.ttl;
 679                 neigh_node->last_ttl = batman_ogm_packet->header.ttl;
 680         }
 681
 682         bonding_candidate_add(orig_node, neigh_node);
 683
 684         /* if this neighbor already is our next hop there is nothing
 685          * to change */
 686         router = orig_node_get_router(orig_node);
 687         if (router == neigh_node)
 688                 goto update_tt;
 689
 690         /* if this neighbor does not offer a better TQ we won't consider it */
 691         if (router && (router->tq_avg > neigh_node->tq_avg))
 692                 goto update_tt;
 693
 694         /* if the TQ is the same and the link not more symmetric we
 695          * won't consider it either */
 696         if (router && (neigh_node->tq_avg == router->tq_avg)) {
 697                 orig_node_tmp = router->orig_node;
 698                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 699                 bcast_own_sum_orig =
 700                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 701                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 702
 703                 orig_node_tmp = neigh_node->orig_node;
 704                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 705                 bcast_own_sum_neigh =
 706                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 707                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 708
 709                 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
 710                         goto update_tt;
 711         }
 712
 713         update_route(bat_priv, orig_node, neigh_node);
 714
 715 update_tt:
 716         /* I have to check for transtable changes only if the OGM has been
 717          * sent through a primary interface */
 718         if (((batman_ogm_packet->orig != ethhdr->h_source) &&
 719              (batman_ogm_packet->header.ttl > 2)) ||
 720             (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
 721                 tt_update_orig(bat_priv, orig_node, tt_buff,
 722                                batman_ogm_packet->tt_num_changes,
 723                                batman_ogm_packet->ttvn,
 724                                batman_ogm_packet->tt_crc);
 725
 726         if (orig_node->gw_flags != batman_ogm_packet->gw_flags)
 727                 gw_node_update(bat_priv, orig_node,
 728                                batman_ogm_packet->gw_flags);
 729
 730         orig_node->gw_flags = batman_ogm_packet->gw_flags;
 731
 732         /* restart gateway selection if fast or late switching was enabled */
 733         if ((orig_node->gw_flags) &&
 734             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 735             (atomic_read(&bat_priv->gw_sel_class) > 2))
 736                 gw_check_election(bat_priv, orig_node);
 737
 738         goto out;
 739
 740 unlock:
 741         rcu_read_unlock();
 742 out:
 743         if (neigh_node)
 744                 neigh_node_free_ref(neigh_node);
 745         if (router)
 746                 neigh_node_free_ref(router);
 747 }
 748
 749 static int bat_iv_ogm_calc_tq(struct orig_node *orig_node,
 750                               struct orig_node *orig_neigh_node,
 751                               struct batman_ogm_packet *batman_ogm_packet,
 752                               struct hard_iface *if_incoming)
 753 {
 754         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 755         struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
 756         struct hlist_node *node;
 757         uint8_t total_count;
 758         uint8_t orig_eq_count, neigh_rq_count, tq_own;
 759         int tq_asym_penalty, ret = 0;
 760
 761         /* find corresponding one hop neighbor */
 762         rcu_read_lock();
 763         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 764                                  &orig_neigh_node->neigh_list, list) {
 765
 766                 if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
 767                         continue;
 768
 769                 if (tmp_neigh_node->if_incoming != if_incoming)
 770                         continue;
 771
 772                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 773                         continue;
 774
 775                 neigh_node = tmp_neigh_node;
 776                 break;
 777         }
 778         rcu_read_unlock();
 779
 780         if (!neigh_node)
 781                 neigh_node = bat_iv_ogm_neigh_new(if_incoming,
 782                                                   orig_neigh_node->orig,
 783                                                   orig_neigh_node,
 784                                                   orig_neigh_node,
 785                                                   batman_ogm_packet->seqno);
 786
 787         if (!neigh_node)
 788                 goto out;
 789
 790         /* if orig_node is direct neighbor update neigh_node last_seen */
 791         if (orig_node == orig_neigh_node)
 792                 neigh_node->last_seen = jiffies;
 793
 794         orig_node->last_seen = jiffies;
 795
 796         /* find packet count of corresponding one hop neighbor */
 797         spin_lock_bh(&orig_node->ogm_cnt_lock);
 798         orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
 799         neigh_rq_count = neigh_node->real_packet_count;
 800         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 801
 802         /* pay attention to not get a value bigger than 100 % */
 803         total_count = (orig_eq_count > neigh_rq_count ?
 804                        neigh_rq_count : orig_eq_count);
 805
 806         /* if we have too few packets (too less data) we set tq_own to zero */
 807         /* if we receive too few packets it is not considered bidirectional */
 808         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 809             (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 810                 tq_own = 0;
 811         else
 812                 /* neigh_node->real_packet_count is never zero as we
 813                  * only purge old information when getting new
 814                  * information */
 815                 tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
 816
 817         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 818          * affect the nearly-symmetric links only a little, but
 819          * punishes asymmetric links more.  This will give a value
 820          * between 0 and TQ_MAX_VALUE
 821          */
 822         tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
 823                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 824                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 825                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
 826                                         (TQ_LOCAL_WINDOW_SIZE *
 827                                          TQ_LOCAL_WINDOW_SIZE *
 828                                          TQ_LOCAL_WINDOW_SIZE);
 829
 830         batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own
 831                                                         * tq_asym_penalty) /
 832                                                 (TQ_MAX_VALUE * TQ_MAX_VALUE));
 833
 834         bat_dbg(DBG_BATMAN, bat_priv,
 835                 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
 836                 orig_node->orig, orig_neigh_node->orig, total_count,
 837                 neigh_rq_count, tq_own, tq_asym_penalty, batman_ogm_packet->tq);
 838
 839         /* if link has the minimum required transmission quality
 840          * consider it bidirectional */
 841         if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 842                 ret = 1;
 843
 844 out:
 845         if (neigh_node)
 846                 neigh_node_free_ref(neigh_node);
 847         return ret;
 848 }
 849
 850 /* processes a batman packet for all interfaces, adjusts the sequence number and
 851  * finds out whether it is a duplicate.
 852  * returns:
 853  *   1 the packet is a duplicate
 854  *   0 the packet has not yet been received
 855  *  -1 the packet is old and has been received while the seqno window
 856  *     was protected. Caller should drop it.
 857  */
 858 static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
 859                                     const struct batman_ogm_packet
 860                                                         *batman_ogm_packet,
 861                                     const struct hard_iface *if_incoming)
 862 {
 863         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 864         struct orig_node *orig_node;
 865         struct neigh_node *tmp_neigh_node;
 866         struct hlist_node *node;
 867         int is_duplicate = 0;
 868         int32_t seq_diff;
 869         int need_update = 0;
 870         int set_mark, ret = -1;
 871
 872         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
 873         if (!orig_node)
 874                 return 0;
 875
 876         spin_lock_bh(&orig_node->ogm_cnt_lock);
 877         seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;
 878
 879         /* signalize caller that the packet is to be dropped. */
 880         if (!hlist_empty(&orig_node->neigh_list) &&
 881             window_protected(bat_priv, seq_diff,
 882                              &orig_node->batman_seqno_reset))
 883                 goto out;
 884
 885         rcu_read_lock();
 886         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 887                                  &orig_node->neigh_list, list) {
 888
 889                 is_duplicate |= bat_test_bit(tmp_neigh_node->real_bits,
 890                                              orig_node->last_real_seqno,
 891                                              batman_ogm_packet->seqno);
 892
 893                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 894                     (tmp_neigh_node->if_incoming == if_incoming))
 895                         set_mark = 1;
 896                 else
 897                         set_mark = 0;
 898
 899                 /* if the window moved, set the update flag. */
 900                 need_update |= bit_get_packet(bat_priv,
 901                                               tmp_neigh_node->real_bits,
 902                                               seq_diff, set_mark);
 903
 904                 tmp_neigh_node->real_packet_count =
 905                         bitmap_weight(tmp_neigh_node->real_bits,
 906                                       TQ_LOCAL_WINDOW_SIZE);
 907         }
 908         rcu_read_unlock();
 909
 910         if (need_update) {
 911                 bat_dbg(DBG_BATMAN, bat_priv,
 912                         "updating last_seqno: old %u, new %u\n",
 913                         orig_node->last_real_seqno, batman_ogm_packet->seqno);
 914                 orig_node->last_real_seqno = batman_ogm_packet->seqno;
 915         }
 916
 917         ret = is_duplicate;
 918
 919 out:
 920         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 921         orig_node_free_ref(orig_node);
 922         return ret;
 923 }
 924
 925 static void bat_iv_ogm_process(const struct ethhdr *ethhdr,
 926                                struct batman_ogm_packet *batman_ogm_packet,
 927                                const unsigned char *tt_buff,
 928                                struct hard_iface *if_incoming)
 929 {
 930         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 931         struct hard_iface *hard_iface;
 932         struct orig_node *orig_neigh_node, *orig_node;
 933         struct neigh_node *router = NULL, *router_router = NULL;
 934         struct neigh_node *orig_neigh_router = NULL;
 935         int has_directlink_flag;
 936         int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 937         int is_broadcast = 0, is_bidirectional;
 938         bool is_single_hop_neigh = false;
 939         bool is_from_best_next_hop = false;
 940         int is_duplicate;
 941         uint32_t if_incoming_seqno;
 942
 943         /* Silently drop when the batman packet is actually not a
 944          * correct packet.
 945          *
 946          * This might happen if a packet is padded (e.g. Ethernet has a
 947          * minimum frame length of 64 byte) and the aggregation interprets
 948          * it as an additional length.
 949          *
 950          * TODO: A more sane solution would be to have a bit in the
 951          * batman_ogm_packet to detect whether the packet is the last
 952          * packet in an aggregation.  Here we expect that the padding
 953          * is always zero (or not 0x01)
 954          */
 955         if (batman_ogm_packet->header.packet_type != BAT_IV_OGM)
 956                 return;
 957
 958         /* could be changed by schedule_own_packet() */
 959         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 960
 961         has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 962
 963         if (compare_eth(ethhdr->h_source, batman_ogm_packet->orig))
 964                 is_single_hop_neigh = true;
 965
 966         bat_dbg(DBG_BATMAN, bat_priv,
 967                 "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",
 968                 ethhdr->h_source, if_incoming->net_dev->name,
 969                 if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,
 970                 batman_ogm_packet->prev_sender, batman_ogm_packet->seqno,
 971                 batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc,
 972                 batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,
 973                 batman_ogm_packet->header.ttl,
 974                 batman_ogm_packet->header.version, has_directlink_flag);
 975
 976         rcu_read_lock();
 977         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
 978                 if (hard_iface->if_status != IF_ACTIVE)
 979                         continue;
 980
 981                 if (hard_iface->soft_iface != if_incoming->soft_iface)
 982                         continue;
 983
 984                 if (compare_eth(ethhdr->h_source,
 985                                 hard_iface->net_dev->dev_addr))
 986                         is_my_addr = 1;
 987
 988                 if (compare_eth(batman_ogm_packet->orig,
 989                                 hard_iface->net_dev->dev_addr))
 990                         is_my_orig = 1;
 991
 992                 if (compare_eth(batman_ogm_packet->prev_sender,
 993                                 hard_iface->net_dev->dev_addr))
 994                         is_my_oldorig = 1;
 995
 996                 if (is_broadcast_ether_addr(ethhdr->h_source))
 997                         is_broadcast = 1;
 998         }
 999         rcu_read_unlock();
1000
1001         if (batman_ogm_packet->header.version != COMPAT_VERSION) {
1002                 bat_dbg(DBG_BATMAN, bat_priv,
1003                         "Drop packet: incompatible batman version (%i)\n",
1004                         batman_ogm_packet->header.version);
1005                 return;
1006         }
1007
1008         if (is_my_addr) {
1009                 bat_dbg(DBG_BATMAN, bat_priv,
1010                         "Drop packet: received my own broadcast (sender: %pM)\n",
1011                         ethhdr->h_source);
1012                 return;
1013         }
1014
1015         if (is_broadcast) {
1016                 bat_dbg(DBG_BATMAN, bat_priv,
1017                         "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1018                         ethhdr->h_source);
1019                 return;
1020         }
1021
1022         if (is_my_orig) {
1023                 unsigned long *word;
1024                 int offset;
1025
1026                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
1027                 if (!orig_neigh_node)
1028                         return;
1029
1030                 /* neighbor has to indicate direct link and it has to
1031                  * come via the corresponding interface */
1032                 /* save packet seqno for bidirectional check */
1033                 if (has_directlink_flag &&
1034                     compare_eth(if_incoming->net_dev->dev_addr,
1035                                 batman_ogm_packet->orig)) {
1036                         offset = if_incoming->if_num * NUM_WORDS;
1037
1038                         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1039                         word = &(orig_neigh_node->bcast_own[offset]);
1040                         bat_set_bit(word,
1041                                     if_incoming_seqno -
1042                                                 batman_ogm_packet->seqno - 2);
1043                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
1044                                 bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE);
1045                         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1046                 }
1047
1048                 bat_dbg(DBG_BATMAN, bat_priv,
1049                         "Drop packet: originator packet from myself (via neighbor)\n");
1050                 orig_node_free_ref(orig_neigh_node);
1051                 return;
1052         }
1053
1054         if (is_my_oldorig) {
1055                 bat_dbg(DBG_BATMAN, bat_priv,
1056                         "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1057                         ethhdr->h_source);
1058                 return;
1059         }
1060
1061         if (batman_ogm_packet->flags & NOT_BEST_NEXT_HOP) {
1062                 bat_dbg(DBG_BATMAN, bat_priv,
1063                         "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1064                         ethhdr->h_source);
1065                 return;
1066         }
1067
1068         orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
1069         if (!orig_node)
1070                 return;
1071
1072         is_duplicate = bat_iv_ogm_update_seqnos(ethhdr, batman_ogm_packet,
1073                                                 if_incoming);
1074
1075         if (is_duplicate == -1) {
1076                 bat_dbg(DBG_BATMAN, bat_priv,
1077                         "Drop packet: packet within seqno protection time (sender: %pM)\n",
1078                         ethhdr->h_source);
1079                 goto out;
1080         }
1081
1082         if (batman_ogm_packet->tq == 0) {
1083                 bat_dbg(DBG_BATMAN, bat_priv,
1084                         "Drop packet: originator packet with tq equal 0\n");
1085                 goto out;
1086         }
1087
1088         router = orig_node_get_router(orig_node);
1089         if (router)
1090                 router_router = orig_node_get_router(router->orig_node);
1091
1092         if ((router && router->tq_avg != 0) &&
1093             (compare_eth(router->addr, ethhdr->h_source)))
1094                 is_from_best_next_hop = true;
1095
1096         /* avoid temporary routing loops */
1097         if (router && router_router &&
1098             (compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&
1099             !(compare_eth(batman_ogm_packet->orig,
1100                           batman_ogm_packet->prev_sender)) &&
1101             (compare_eth(router->addr, router_router->addr))) {
1102                 bat_dbg(DBG_BATMAN, bat_priv,
1103                         "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1104                         ethhdr->h_source);
1105                 goto out;
1106         }
1107
1108         /* if sender is a direct neighbor the sender mac equals
1109          * originator mac */
1110         orig_neigh_node = (is_single_hop_neigh ?
1111                            orig_node :
1112                            get_orig_node(bat_priv, ethhdr->h_source));
1113         if (!orig_neigh_node)
1114                 goto out;
1115
1116         orig_neigh_router = orig_node_get_router(orig_neigh_node);
1117
1118         /* drop packet if sender is not a direct neighbor and if we
1119          * don't route towards it */
1120         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1121                 bat_dbg(DBG_BATMAN, bat_priv,
1122                         "Drop packet: OGM via unknown neighbor!\n");
1123                 goto out_neigh;
1124         }
1125
1126         is_bidirectional = bat_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1127                                               batman_ogm_packet, if_incoming);
1128
1129         bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet);
1130
1131         /* update ranking if it is not a duplicate or has the same
1132          * seqno and similar ttl as the non-duplicate */
1133         if (is_bidirectional &&
1134             (!is_duplicate ||
1135              ((orig_node->last_real_seqno == batman_ogm_packet->seqno) &&
1136               (orig_node->last_ttl - 3 <= batman_ogm_packet->header.ttl))))
1137                 bat_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1138                                        batman_ogm_packet, if_incoming,
1139                                        tt_buff, is_duplicate);
1140
1141         /* is single hop (direct) neighbor */
1142         if (is_single_hop_neigh) {
1143
1144                 /* mark direct link on incoming interface */
1145                 bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1146                                    is_single_hop_neigh, is_from_best_next_hop,
1147                                    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, is_from_best_next_hop,
1171                            if_incoming);
1172
1173 out_neigh:
1174         if ((orig_neigh_node) && (!is_single_hop_neigh))
1175                 orig_node_free_ref(orig_neigh_node);
1176 out:
1177         if (router)
1178                 neigh_node_free_ref(router);
1179         if (router_router)
1180                 neigh_node_free_ref(router_router);
1181         if (orig_neigh_router)
1182                 neigh_node_free_ref(orig_neigh_router);
1183
1184         orig_node_free_ref(orig_node);
1185 }
1186
1187 static int bat_iv_ogm_receive(struct sk_buff *skb,
1188                               struct hard_iface *if_incoming)
1189 {
1190         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1191         struct batman_ogm_packet *batman_ogm_packet;
1192         struct ethhdr *ethhdr;
1193         int buff_pos = 0, packet_len;
1194         unsigned char *tt_buff, *packet_buff;
1195         bool ret;
1196
1197         ret = check_management_packet(skb, if_incoming, BATMAN_OGM_HLEN);
1198         if (!ret)
1199                 return NET_RX_DROP;
1200
1201         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1202          * that does not have B.A.T.M.A.N. IV enabled ?
1203          */
1204         if (bat_priv->bat_algo_ops->bat_ogm_emit != bat_iv_ogm_emit)
1205                 return NET_RX_DROP;
1206
1207         packet_len = skb_headlen(skb);
1208         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1209         packet_buff = skb->data;
1210         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
1211
1212         /* unpack the aggregated packets and process them one by one */
1213         do {
1214                 /* network to host order for our 32bit seqno and the
1215                    orig_interval */
1216                 batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);
1217                 batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);
1218
1219                 tt_buff = packet_buff + buff_pos + BATMAN_OGM_HLEN;
1220
1221                 bat_iv_ogm_process(ethhdr, batman_ogm_packet,
1222                                    tt_buff, if_incoming);
1223
1224                 buff_pos += BATMAN_OGM_HLEN +
1225                                 tt_len(batman_ogm_packet->tt_num_changes);
1226
1227                 batman_ogm_packet = (struct batman_ogm_packet *)
1228                                                 (packet_buff + buff_pos);
1229         } while (bat_iv_ogm_aggr_packet(buff_pos, packet_len,
1230                                         batman_ogm_packet->tt_num_changes));
1231
1232         kfree_skb(skb);
1233         return NET_RX_SUCCESS;
1234 }
1235
1236 static struct bat_algo_ops batman_iv __read_mostly = {
1237         .name = "BATMAN IV",
1238         .bat_iface_enable = bat_iv_ogm_iface_enable,
1239         .bat_iface_disable = bat_iv_ogm_iface_disable,
1240         .bat_iface_update_mac = bat_iv_ogm_iface_update_mac,
1241         .bat_primary_iface_set = bat_iv_ogm_primary_iface_set,
1242         .bat_ogm_schedule = bat_iv_ogm_schedule,
1243         .bat_ogm_emit = bat_iv_ogm_emit,
1244 };
1245
1246 int __init bat_iv_init(void)
1247 {
1248         int ret;
1249
1250         /* batman originator packet */
1251         ret = recv_handler_register(BAT_IV_OGM, bat_iv_ogm_receive);
1252         if (ret < 0)
1253                 goto out;
1254
1255         ret = bat_algo_register(&batman_iv);
1256         if (ret < 0)
1257                 goto handler_unregister;
1258
1259         goto out;
1260
1261 handler_unregister:
1262         recv_handler_unregister(BAT_IV_OGM);
1263 out:
1264         return ret;
1265 }