net/batman-adv/bat_iv_ogm.c

   1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA
  18  */
  19
  20 #include "main.h"
  21 #include "translation-table.h"
  22 #include "ring_buffer.h"
  23 #include "originator.h"
  24 #include "routing.h"
  25 #include "gateway_common.h"
  26 #include "gateway_client.h"
  27 #include "hard-interface.h"
  28 #include "send.h"
  29 #include "bat_algo.h"
  30
  31 static struct neigh_node *bat_iv_ogm_neigh_new(struct hard_iface *hard_iface,
  32                                                const uint8_t *neigh_addr,
  33                                                struct orig_node *orig_node,
  34                                                struct orig_node *orig_neigh,
  35                                                __be32 seqno)
  36 {
  37         struct neigh_node *neigh_node;
  38
  39         neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr,
  40                                            ntohl(seqno));
  41         if (!neigh_node)
  42                 goto out;
  43
  44         INIT_LIST_HEAD(&neigh_node->bonding_list);
  45
  46         neigh_node->orig_node = orig_neigh;
  47         neigh_node->if_incoming = hard_iface;
  48
  49         spin_lock_bh(&orig_node->neigh_list_lock);
  50         hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
  51         spin_unlock_bh(&orig_node->neigh_list_lock);
  52
  53 out:
  54         return neigh_node;
  55 }
  56
  57 static int bat_iv_ogm_iface_enable(struct hard_iface *hard_iface)
  58 {
  59         struct batman_ogm_packet *batman_ogm_packet;
  60         uint32_t random_seqno;
  61         int res = -ENOMEM;
  62
  63         /* randomize initial seqno to avoid collision */
  64         get_random_bytes(&random_seqno, sizeof(random_seqno));
  65         atomic_set(&hard_iface->seqno, random_seqno);
  66
  67         hard_iface->packet_len = BATMAN_OGM_HLEN;
  68         hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
  69
  70         if (!hard_iface->packet_buff)
  71                 goto out;
  72
  73         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  74         batman_ogm_packet->header.packet_type = BAT_IV_OGM;
  75         batman_ogm_packet->header.version = COMPAT_VERSION;
  76         batman_ogm_packet->header.ttl = 2;
  77         batman_ogm_packet->flags = NO_FLAGS;
  78         batman_ogm_packet->tq = TQ_MAX_VALUE;
  79         batman_ogm_packet->tt_num_changes = 0;
  80         batman_ogm_packet->ttvn = 0;
  81
  82         res = 0;
  83
  84 out:
  85         return res;
  86 }
  87
  88 static void bat_iv_ogm_iface_disable(struct hard_iface *hard_iface)
  89 {
  90         kfree(hard_iface->packet_buff);
  91         hard_iface->packet_buff = NULL;
  92 }
  93
  94 static void bat_iv_ogm_iface_update_mac(struct hard_iface *hard_iface)
  95 {
  96         struct batman_ogm_packet *batman_ogm_packet;
  97
  98         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
  99         memcpy(batman_ogm_packet->orig,
 100                hard_iface->net_dev->dev_addr, ETH_ALEN);
 101         memcpy(batman_ogm_packet->prev_sender,
 102                hard_iface->net_dev->dev_addr, ETH_ALEN);
 103 }
 104
 105 static void bat_iv_ogm_primary_iface_set(struct hard_iface *hard_iface)
 106 {
 107         struct batman_ogm_packet *batman_ogm_packet;
 108
 109         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
 110         batman_ogm_packet->flags = PRIMARIES_FIRST_HOP;
 111         batman_ogm_packet->header.ttl = TTL;
 112 }
 113
 114 /* when do we schedule our own ogm to be sent */
 115 static unsigned long bat_iv_ogm_emit_send_time(const struct bat_priv *bat_priv)
 116 {
 117         return jiffies + msecs_to_jiffies(
 118                    atomic_read(&bat_priv->orig_interval) -
 119                    JITTER + (random32() % 2*JITTER));
 120 }
 121
 122 /* when do we schedule a ogm packet to be sent */
 123 static unsigned long bat_iv_ogm_fwd_send_time(void)
 124 {
 125         return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
 126 }
 127
 128 /* apply hop penalty for a normal link */
 129 static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
 130 {
 131         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 132         return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
 133 }
 134
 135 /* is there another aggregated packet here? */
 136 static int bat_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 137                                   int tt_num_changes)
 138 {
 139         int next_buff_pos = 0;
 140
 141         next_buff_pos += buff_pos + BATMAN_OGM_HLEN;
 142         next_buff_pos += batadv_tt_len(tt_num_changes);
 143
 144         return (next_buff_pos <= packet_len) &&
 145                 (next_buff_pos <= MAX_AGGREGATION_BYTES);
 146 }
 147
 148 /* send a batman ogm to a given interface */
 149 static void bat_iv_ogm_send_to_if(struct forw_packet *forw_packet,
 150                                   struct hard_iface *hard_iface)
 151 {
 152         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 153         char *fwd_str;
 154         uint8_t packet_num;
 155         int16_t buff_pos;
 156         struct batman_ogm_packet *batman_ogm_packet;
 157         struct sk_buff *skb;
 158
 159         if (hard_iface->if_status != IF_ACTIVE)
 160                 return;
 161
 162         packet_num = 0;
 163         buff_pos = 0;
 164         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 165
 166         /* adjust all flags and log packets */
 167         while (bat_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 168                                       batman_ogm_packet->tt_num_changes)) {
 169
 170                 /* we might have aggregated direct link packets with an
 171                  * ordinary base packet
 172                  */
 173                 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
 174                     (forw_packet->if_incoming == hard_iface))
 175                         batman_ogm_packet->flags |= DIRECTLINK;
 176                 else
 177                         batman_ogm_packet->flags &= ~DIRECTLINK;
 178
 179                 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
 180                                                             "Sending own" :
 181                                                             "Forwarding"));
 182                 bat_dbg(DBG_BATMAN, bat_priv,
 183                         "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
 184                         fwd_str, (packet_num > 0 ? "aggregated " : ""),
 185                         batman_ogm_packet->orig,
 186                         ntohl(batman_ogm_packet->seqno),
 187                         batman_ogm_packet->tq, batman_ogm_packet->header.ttl,
 188                         (batman_ogm_packet->flags & DIRECTLINK ?
 189                          "on" : "off"),
 190                         batman_ogm_packet->ttvn, hard_iface->net_dev->name,
 191                         hard_iface->net_dev->dev_addr);
 192
 193                 buff_pos += BATMAN_OGM_HLEN;
 194                 buff_pos += batadv_tt_len(batman_ogm_packet->tt_num_changes);
 195                 packet_num++;
 196                 batman_ogm_packet = (struct batman_ogm_packet *)
 197                                         (forw_packet->skb->data + buff_pos);
 198         }
 199
 200         /* create clone because function is called more than once */
 201         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 202         if (skb) {
 203                 batadv_inc_counter(bat_priv, BAT_CNT_MGMT_TX);
 204                 batadv_add_counter(bat_priv, BAT_CNT_MGMT_TX_BYTES,
 205                                    skb->len + ETH_HLEN);
 206                 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 207         }
 208 }
 209
 210 /* send a batman ogm packet */
 211 static void bat_iv_ogm_emit(struct forw_packet *forw_packet)
 212 {
 213         struct hard_iface *hard_iface;
 214         struct net_device *soft_iface;
 215         struct bat_priv *bat_priv;
 216         struct hard_iface *primary_if = NULL;
 217         struct batman_ogm_packet *batman_ogm_packet;
 218         unsigned char directlink;
 219
 220         batman_ogm_packet = (struct batman_ogm_packet *)
 221                                                 (forw_packet->skb->data);
 222         directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 223
 224         if (!forw_packet->if_incoming) {
 225                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 226                 goto out;
 227         }
 228
 229         soft_iface = forw_packet->if_incoming->soft_iface;
 230         bat_priv = netdev_priv(soft_iface);
 231
 232         if (forw_packet->if_incoming->if_status != IF_ACTIVE)
 233                 goto out;
 234
 235         primary_if = batadv_primary_if_get_selected(bat_priv);
 236         if (!primary_if)
 237                 goto out;
 238
 239         /* multihomed peer assumed
 240          * non-primary OGMs are only broadcasted on their interface
 241          */
 242         if ((directlink && (batman_ogm_packet->header.ttl == 1)) ||
 243             (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
 244
 245                 /* FIXME: what about aggregated packets ? */
 246                 bat_dbg(DBG_BATMAN, bat_priv,
 247                         "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
 248                         (forw_packet->own ? "Sending own" : "Forwarding"),
 249                         batman_ogm_packet->orig,
 250                         ntohl(batman_ogm_packet->seqno),
 251                         batman_ogm_packet->header.ttl,
 252                         forw_packet->if_incoming->net_dev->name,
 253                         forw_packet->if_incoming->net_dev->dev_addr);
 254
 255                 /* skb is only used once and than forw_packet is free'd */
 256                 batadv_send_skb_packet(forw_packet->skb,
 257                                        forw_packet->if_incoming,
 258                                        batadv_broadcast_addr);
 259                 forw_packet->skb = NULL;
 260
 261                 goto out;
 262         }
 263
 264         /* broadcast on every interface */
 265         rcu_read_lock();
 266         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 267                 if (hard_iface->soft_iface != soft_iface)
 268                         continue;
 269
 270                 bat_iv_ogm_send_to_if(forw_packet, hard_iface);
 271         }
 272         rcu_read_unlock();
 273
 274 out:
 275         if (primary_if)
 276                 batadv_hardif_free_ref(primary_if);
 277 }
 278
 279 /* return true if new_packet can be aggregated with forw_packet */
 280 static bool bat_iv_ogm_can_aggregate(const struct batman_ogm_packet
 281                                                         *new_batman_ogm_packet,
 282                                      struct bat_priv *bat_priv,
 283                                      int packet_len, unsigned long send_time,
 284                                      bool directlink,
 285                                      const struct hard_iface *if_incoming,
 286                                      const struct forw_packet *forw_packet)
 287 {
 288         struct batman_ogm_packet *batman_ogm_packet;
 289         int aggregated_bytes = forw_packet->packet_len + packet_len;
 290         struct hard_iface *primary_if = NULL;
 291         bool res = false;
 292
 293         batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
 294
 295         /* we can aggregate the current packet to this aggregated packet
 296          * if:
 297          *
 298          * - the send time is within our MAX_AGGREGATION_MS time
 299          * - the resulting packet wont be bigger than
 300          *   MAX_AGGREGATION_BYTES
 301          */
 302         if (time_before(send_time, forw_packet->send_time) &&
 303             time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
 304                                         forw_packet->send_time) &&
 305             (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
 306
 307                 /* check aggregation compatibility
 308                  * -> direct link packets are broadcasted on
 309                  *    their interface only
 310                  * -> aggregate packet if the current packet is
 311                  *    a "global" packet as well as the base
 312                  *    packet
 313                  */
 314                 primary_if = batadv_primary_if_get_selected(bat_priv);
 315                 if (!primary_if)
 316                         goto out;
 317
 318                 /* packets without direct link flag and high TTL
 319                  * are flooded through the net
 320                  */
 321                 if ((!directlink) &&
 322                     (!(batman_ogm_packet->flags & DIRECTLINK)) &&
 323                     (batman_ogm_packet->header.ttl != 1) &&
 324
 325                     /* own packets originating non-primary
 326                      * interfaces leave only that interface
 327                      */
 328                     ((!forw_packet->own) ||
 329                      (forw_packet->if_incoming == primary_if))) {
 330                         res = true;
 331                         goto out;
 332                 }
 333
 334                 /* if the incoming packet is sent via this one
 335                  * interface only - we still can aggregate
 336                  */
 337                 if ((directlink) &&
 338                     (new_batman_ogm_packet->header.ttl == 1) &&
 339                     (forw_packet->if_incoming == if_incoming) &&
 340
 341                     /* packets from direct neighbors or
 342                      * own secondary interface packets
 343                      * (= secondary interface packets in general)
 344                      */
 345                     (batman_ogm_packet->flags & DIRECTLINK ||
 346                      (forw_packet->own &&
 347                       forw_packet->if_incoming != primary_if))) {
 348                         res = true;
 349                         goto out;
 350                 }
 351         }
 352
 353 out:
 354         if (primary_if)
 355                 batadv_hardif_free_ref(primary_if);
 356         return res;
 357 }
 358
 359 /* create a new aggregated packet and add this packet to it */
 360 static void bat_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 361                                      int packet_len, unsigned long send_time,
 362                                      bool direct_link,
 363                                      struct hard_iface *if_incoming,
 364                                      int own_packet)
 365 {
 366         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 367         struct forw_packet *forw_packet_aggr;
 368         unsigned char *skb_buff;
 369
 370         if (!atomic_inc_not_zero(&if_incoming->refcount))
 371                 return;
 372
 373         /* own packet should always be scheduled */
 374         if (!own_packet) {
 375                 if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 376                         bat_dbg(DBG_BATMAN, bat_priv,
 377                                 "batman packet queue full\n");
 378                         goto out;
 379                 }
 380         }
 381
 382         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 383         if (!forw_packet_aggr) {
 384                 if (!own_packet)
 385                         atomic_inc(&bat_priv->batman_queue_left);
 386                 goto out;
 387         }
 388
 389         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 390             (packet_len < MAX_AGGREGATION_BYTES))
 391                 forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
 392                                                       ETH_HLEN);
 393         else
 394                 forw_packet_aggr->skb = dev_alloc_skb(packet_len + ETH_HLEN);
 395
 396         if (!forw_packet_aggr->skb) {
 397                 if (!own_packet)
 398                         atomic_inc(&bat_priv->batman_queue_left);
 399                 kfree(forw_packet_aggr);
 400                 goto out;
 401         }
 402         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 403
 404         INIT_HLIST_NODE(&forw_packet_aggr->list);
 405
 406         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 407         forw_packet_aggr->packet_len = packet_len;
 408         memcpy(skb_buff, packet_buff, packet_len);
 409
 410         forw_packet_aggr->own = own_packet;
 411         forw_packet_aggr->if_incoming = if_incoming;
 412         forw_packet_aggr->num_packets = 0;
 413         forw_packet_aggr->direct_link_flags = NO_FLAGS;
 414         forw_packet_aggr->send_time = send_time;
 415
 416         /* save packet direct link flag status */
 417         if (direct_link)
 418                 forw_packet_aggr->direct_link_flags |= 1;
 419
 420         /* add new packet to packet list */
 421         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 422         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 423         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 424
 425         /* start timer for this packet */
 426         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 427                           batadv_send_outstanding_bat_ogm_packet);
 428         queue_delayed_work(batadv_event_workqueue,
 429                            &forw_packet_aggr->delayed_work,
 430                            send_time - jiffies);
 431
 432         return;
 433 out:
 434         batadv_hardif_free_ref(if_incoming);
 435 }
 436
 437 /* aggregate a new packet into the existing ogm packet */
 438 static void bat_iv_ogm_aggregate(struct forw_packet *forw_packet_aggr,
 439                                  const unsigned char *packet_buff,
 440                                  int packet_len, bool direct_link)
 441 {
 442         unsigned char *skb_buff;
 443
 444         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 445         memcpy(skb_buff, packet_buff, packet_len);
 446         forw_packet_aggr->packet_len += packet_len;
 447         forw_packet_aggr->num_packets++;
 448
 449         /* save packet direct link flag status */
 450         if (direct_link)
 451                 forw_packet_aggr->direct_link_flags |=
 452                         (1 << forw_packet_aggr->num_packets);
 453 }
 454
 455 static void bat_iv_ogm_queue_add(struct bat_priv *bat_priv,
 456                                  unsigned char *packet_buff,
 457                                  int packet_len, struct hard_iface *if_incoming,
 458                                  int own_packet, unsigned long send_time)
 459 {
 460         /* _aggr -> pointer to the packet we want to aggregate with
 461          * _pos -> pointer to the position in the queue
 462          */
 463         struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
 464         struct hlist_node *tmp_node;
 465         struct batman_ogm_packet *batman_ogm_packet;
 466         bool direct_link;
 467
 468         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
 469         direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0;
 470
 471         /* find position for the packet in the forward queue */
 472         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 473         /* own packets are not to be aggregated */
 474         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 475                 hlist_for_each_entry(forw_packet_pos, tmp_node,
 476                                      &bat_priv->forw_bat_list, list) {
 477                         if (bat_iv_ogm_can_aggregate(batman_ogm_packet,
 478                                                      bat_priv, packet_len,
 479                                                      send_time, direct_link,
 480                                                      if_incoming,
 481                                                      forw_packet_pos)) {
 482                                 forw_packet_aggr = forw_packet_pos;
 483                                 break;
 484                         }
 485                 }
 486         }
 487
 488         /* nothing to aggregate with - either aggregation disabled or no
 489          * suitable aggregation packet found
 490          */
 491         if (!forw_packet_aggr) {
 492                 /* the following section can run without the lock */
 493                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 494
 495                 /* if we could not aggregate this packet with one of the others
 496                  * we hold it back for a while, so that it might be aggregated
 497                  * later on
 498                  */
 499                 if ((!own_packet) &&
 500                     (atomic_read(&bat_priv->aggregated_ogms)))
 501                         send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
 502
 503                 bat_iv_ogm_aggregate_new(packet_buff, packet_len,
 504                                          send_time, direct_link,
 505                                          if_incoming, own_packet);
 506         } else {
 507                 bat_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 508                                      packet_len, direct_link);
 509                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 510         }
 511 }
 512
 513 static void bat_iv_ogm_forward(struct orig_node *orig_node,
 514                                const struct ethhdr *ethhdr,
 515                                struct batman_ogm_packet *batman_ogm_packet,
 516                                bool is_single_hop_neigh,
 517                                bool is_from_best_next_hop,
 518                                struct hard_iface *if_incoming)
 519 {
 520         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 521         uint8_t tt_num_changes;
 522
 523         if (batman_ogm_packet->header.ttl <= 1) {
 524                 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
 525                 return;
 526         }
 527
 528         if (!is_from_best_next_hop) {
 529                 /* Mark the forwarded packet when it is not coming from our
 530                  * best next hop. We still need to forward the packet for our
 531                  * neighbor link quality detection to work in case the packet
 532                  * originated from a single hop neighbor. Otherwise we can
 533                  * simply drop the ogm.
 534                  */
 535                 if (is_single_hop_neigh)
 536                         batman_ogm_packet->flags |= NOT_BEST_NEXT_HOP;
 537                 else
 538                         return;
 539         }
 540
 541         tt_num_changes = batman_ogm_packet->tt_num_changes;
 542
 543         batman_ogm_packet->header.ttl--;
 544         memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 545
 546         /* apply hop penalty */
 547         batman_ogm_packet->tq = hop_penalty(batman_ogm_packet->tq, bat_priv);
 548
 549         bat_dbg(DBG_BATMAN, bat_priv,
 550                 "Forwarding packet: tq: %i, ttl: %i\n",
 551                 batman_ogm_packet->tq, batman_ogm_packet->header.ttl);
 552
 553         /* switch of primaries first hop flag when forwarding */
 554         batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP;
 555         if (is_single_hop_neigh)
 556                 batman_ogm_packet->flags |= DIRECTLINK;
 557         else
 558                 batman_ogm_packet->flags &= ~DIRECTLINK;
 559
 560         bat_iv_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet,
 561                              BATMAN_OGM_HLEN + batadv_tt_len(tt_num_changes),
 562                              if_incoming, 0, bat_iv_ogm_fwd_send_time());
 563 }
 564
 565 static void bat_iv_ogm_schedule(struct hard_iface *hard_iface)
 566 {
 567         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 568         struct batman_ogm_packet *batman_ogm_packet;
 569         struct hard_iface *primary_if;
 570         int vis_server, tt_num_changes = 0;
 571
 572         vis_server = atomic_read(&bat_priv->vis_mode);
 573         primary_if = batadv_primary_if_get_selected(bat_priv);
 574
 575         if (hard_iface == primary_if)
 576                 tt_num_changes = batadv_tt_append_diff(bat_priv,
 577                                                        &hard_iface->packet_buff,
 578                                                        &hard_iface->packet_len,
 579                                                        BATMAN_OGM_HLEN);
 580
 581         batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
 582
 583         /* change sequence number to network order */
 584         batman_ogm_packet->seqno =
 585                         htonl((uint32_t)atomic_read(&hard_iface->seqno));
 586         atomic_inc(&hard_iface->seqno);
 587
 588         batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn);
 589         batman_ogm_packet->tt_crc = htons(bat_priv->tt_crc);
 590         if (tt_num_changes >= 0)
 591                 batman_ogm_packet->tt_num_changes = tt_num_changes;
 592
 593         if (vis_server == VIS_TYPE_SERVER_SYNC)
 594                 batman_ogm_packet->flags |= VIS_SERVER;
 595         else
 596                 batman_ogm_packet->flags &= ~VIS_SERVER;
 597
 598         if ((hard_iface == primary_if) &&
 599             (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
 600                 batman_ogm_packet->gw_flags =
 601                                 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 602         else
 603                 batman_ogm_packet->gw_flags = NO_FLAGS;
 604
 605         batadv_slide_own_bcast_window(hard_iface);
 606         bat_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff,
 607                              hard_iface->packet_len, hard_iface, 1,
 608                              bat_iv_ogm_emit_send_time(bat_priv));
 609
 610         if (primary_if)
 611                 batadv_hardif_free_ref(primary_if);
 612 }
 613
 614 static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv,
 615                                    struct orig_node *orig_node,
 616                                    const struct ethhdr *ethhdr,
 617                                    const struct batman_ogm_packet
 618                                                         *batman_ogm_packet,
 619                                    struct hard_iface *if_incoming,
 620                                    const unsigned char *tt_buff,
 621                                    int is_duplicate)
 622 {
 623         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 624         struct neigh_node *router = NULL;
 625         struct orig_node *orig_node_tmp;
 626         struct hlist_node *node;
 627         uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
 628
 629         bat_dbg(DBG_BATMAN, bat_priv,
 630                 "update_originator(): Searching and updating originator entry of received packet\n");
 631
 632         rcu_read_lock();
 633         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 634                                  &orig_node->neigh_list, list) {
 635                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 636                     (tmp_neigh_node->if_incoming == if_incoming) &&
 637                      atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 638                         if (neigh_node)
 639                                 batadv_neigh_node_free_ref(neigh_node);
 640                         neigh_node = tmp_neigh_node;
 641                         continue;
 642                 }
 643
 644                 if (is_duplicate)
 645                         continue;
 646
 647                 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
 648                 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
 649                                        &tmp_neigh_node->tq_index, 0);
 650                 tmp_neigh_node->tq_avg =
 651                         batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
 652                 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
 653         }
 654
 655         if (!neigh_node) {
 656                 struct orig_node *orig_tmp;
 657
 658                 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
 659                 if (!orig_tmp)
 660                         goto unlock;
 661
 662                 neigh_node = bat_iv_ogm_neigh_new(if_incoming, ethhdr->h_source,
 663                                                   orig_node, orig_tmp,
 664                                                   batman_ogm_packet->seqno);
 665
 666                 batadv_orig_node_free_ref(orig_tmp);
 667                 if (!neigh_node)
 668                         goto unlock;
 669         } else
 670                 bat_dbg(DBG_BATMAN, bat_priv,
 671                         "Updating existing last-hop neighbor of originator\n");
 672
 673         rcu_read_unlock();
 674
 675         orig_node->flags = batman_ogm_packet->flags;
 676         neigh_node->last_seen = jiffies;
 677
 678         spin_lock_bh(&neigh_node->lq_update_lock);
 679         batadv_ring_buffer_set(neigh_node->tq_recv,
 680                                &neigh_node->tq_index,
 681                                batman_ogm_packet->tq);
 682         neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
 683         spin_unlock_bh(&neigh_node->lq_update_lock);
 684
 685         if (!is_duplicate) {
 686                 orig_node->last_ttl = batman_ogm_packet->header.ttl;
 687                 neigh_node->last_ttl = batman_ogm_packet->header.ttl;
 688         }
 689
 690         batadv_bonding_candidate_add(orig_node, neigh_node);
 691
 692         /* if this neighbor already is our next hop there is nothing
 693          * to change
 694          */
 695         router = batadv_orig_node_get_router(orig_node);
 696         if (router == neigh_node)
 697                 goto update_tt;
 698
 699         /* if this neighbor does not offer a better TQ we won't consider it */
 700         if (router && (router->tq_avg > neigh_node->tq_avg))
 701                 goto update_tt;
 702
 703         /* if the TQ is the same and the link not more symmetric we
 704          * won't consider it either
 705          */
 706         if (router && (neigh_node->tq_avg == router->tq_avg)) {
 707                 orig_node_tmp = router->orig_node;
 708                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 709                 bcast_own_sum_orig =
 710                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 711                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 712
 713                 orig_node_tmp = neigh_node->orig_node;
 714                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 715                 bcast_own_sum_neigh =
 716                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
 717                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 718
 719                 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
 720                         goto update_tt;
 721         }
 722
 723         batadv_update_route(bat_priv, orig_node, neigh_node);
 724
 725 update_tt:
 726         /* I have to check for transtable changes only if the OGM has been
 727          * sent through a primary interface
 728          */
 729         if (((batman_ogm_packet->orig != ethhdr->h_source) &&
 730              (batman_ogm_packet->header.ttl > 2)) ||
 731             (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
 732                 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
 733                                       batman_ogm_packet->tt_num_changes,
 734                                       batman_ogm_packet->ttvn,
 735                                       ntohs(batman_ogm_packet->tt_crc));
 736
 737         if (orig_node->gw_flags != batman_ogm_packet->gw_flags)
 738                 batadv_gw_node_update(bat_priv, orig_node,
 739                                       batman_ogm_packet->gw_flags);
 740
 741         orig_node->gw_flags = batman_ogm_packet->gw_flags;
 742
 743         /* restart gateway selection if fast or late switching was enabled */
 744         if ((orig_node->gw_flags) &&
 745             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 746             (atomic_read(&bat_priv->gw_sel_class) > 2))
 747                 batadv_gw_check_election(bat_priv, orig_node);
 748
 749         goto out;
 750
 751 unlock:
 752         rcu_read_unlock();
 753 out:
 754         if (neigh_node)
 755                 batadv_neigh_node_free_ref(neigh_node);
 756         if (router)
 757                 batadv_neigh_node_free_ref(router);
 758 }
 759
 760 static int bat_iv_ogm_calc_tq(struct orig_node *orig_node,
 761                               struct orig_node *orig_neigh_node,
 762                               struct batman_ogm_packet *batman_ogm_packet,
 763                               struct hard_iface *if_incoming)
 764 {
 765         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 766         struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
 767         struct hlist_node *node;
 768         uint8_t total_count;
 769         uint8_t orig_eq_count, neigh_rq_count, tq_own;
 770         int tq_asym_penalty, ret = 0;
 771
 772         /* find corresponding one hop neighbor */
 773         rcu_read_lock();
 774         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 775                                  &orig_neigh_node->neigh_list, list) {
 776
 777                 if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
 778                         continue;
 779
 780                 if (tmp_neigh_node->if_incoming != if_incoming)
 781                         continue;
 782
 783                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 784                         continue;
 785
 786                 neigh_node = tmp_neigh_node;
 787                 break;
 788         }
 789         rcu_read_unlock();
 790
 791         if (!neigh_node)
 792                 neigh_node = bat_iv_ogm_neigh_new(if_incoming,
 793                                                   orig_neigh_node->orig,
 794                                                   orig_neigh_node,
 795                                                   orig_neigh_node,
 796                                                   batman_ogm_packet->seqno);
 797
 798         if (!neigh_node)
 799                 goto out;
 800
 801         /* if orig_node is direct neighbor update neigh_node last_seen */
 802         if (orig_node == orig_neigh_node)
 803                 neigh_node->last_seen = jiffies;
 804
 805         orig_node->last_seen = jiffies;
 806
 807         /* find packet count of corresponding one hop neighbor */
 808         spin_lock_bh(&orig_node->ogm_cnt_lock);
 809         orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
 810         neigh_rq_count = neigh_node->real_packet_count;
 811         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 812
 813         /* pay attention to not get a value bigger than 100 % */
 814         total_count = (orig_eq_count > neigh_rq_count ?
 815                        neigh_rq_count : orig_eq_count);
 816
 817         /* if we have too few packets (too less data) we set tq_own to zero
 818          * if we receive too few packets it is not considered bidirectional
 819          */
 820         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 821             (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 822                 tq_own = 0;
 823         else
 824                 /* neigh_node->real_packet_count is never zero as we
 825                  * only purge old information when getting new
 826                  * information
 827                  */
 828                 tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
 829
 830         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 831          * affect the nearly-symmetric links only a little, but
 832          * punishes asymmetric links more.  This will give a value
 833          * between 0 and TQ_MAX_VALUE
 834          */
 835         tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
 836                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 837                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
 838                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
 839                                         (TQ_LOCAL_WINDOW_SIZE *
 840                                          TQ_LOCAL_WINDOW_SIZE *
 841                                          TQ_LOCAL_WINDOW_SIZE);
 842
 843         batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own
 844                                                         * tq_asym_penalty) /
 845                                                 (TQ_MAX_VALUE * TQ_MAX_VALUE));
 846
 847         bat_dbg(DBG_BATMAN, bat_priv,
 848                 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
 849                 orig_node->orig, orig_neigh_node->orig, total_count,
 850                 neigh_rq_count, tq_own, tq_asym_penalty, batman_ogm_packet->tq);
 851
 852         /* if link has the minimum required transmission quality
 853          * consider it bidirectional
 854          */
 855         if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 856                 ret = 1;
 857
 858 out:
 859         if (neigh_node)
 860                 batadv_neigh_node_free_ref(neigh_node);
 861         return ret;
 862 }
 863
 864 /* processes a batman packet for all interfaces, adjusts the sequence number and
 865  * finds out whether it is a duplicate.
 866  * returns:
 867  *   1 the packet is a duplicate
 868  *   0 the packet has not yet been received
 869  *  -1 the packet is old and has been received while the seqno window
 870  *     was protected. Caller should drop it.
 871  */
 872 static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
 873                                     const struct batman_ogm_packet
 874                                                         *batman_ogm_packet,
 875                                     const struct hard_iface *if_incoming)
 876 {
 877         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 878         struct orig_node *orig_node;
 879         struct neigh_node *tmp_neigh_node;
 880         struct hlist_node *node;
 881         int is_duplicate = 0;
 882         int32_t seq_diff;
 883         int need_update = 0;
 884         int set_mark, ret = -1;
 885         uint32_t seqno = ntohl(batman_ogm_packet->seqno);
 886
 887         orig_node = batadv_get_orig_node(bat_priv, batman_ogm_packet->orig);
 888         if (!orig_node)
 889                 return 0;
 890
 891         spin_lock_bh(&orig_node->ogm_cnt_lock);
 892         seq_diff = seqno - orig_node->last_real_seqno;
 893
 894         /* signalize caller that the packet is to be dropped. */
 895         if (!hlist_empty(&orig_node->neigh_list) &&
 896             batadv_window_protected(bat_priv, seq_diff,
 897                                     &orig_node->batman_seqno_reset))
 898                 goto out;
 899
 900         rcu_read_lock();
 901         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 902                                  &orig_node->neigh_list, list) {
 903
 904                 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
 905                                                 orig_node->last_real_seqno,
 906                                                 seqno);
 907
 908                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
 909                     (tmp_neigh_node->if_incoming == if_incoming))
 910                         set_mark = 1;
 911                 else
 912                         set_mark = 0;
 913
 914                 /* if the window moved, set the update flag. */
 915                 need_update |= batadv_bit_get_packet(bat_priv,
 916                                                      tmp_neigh_node->real_bits,
 917                                                      seq_diff, set_mark);
 918
 919                 tmp_neigh_node->real_packet_count =
 920                         bitmap_weight(tmp_neigh_node->real_bits,
 921                                       TQ_LOCAL_WINDOW_SIZE);
 922         }
 923         rcu_read_unlock();
 924
 925         if (need_update) {
 926                 bat_dbg(DBG_BATMAN, bat_priv,
 927                         "updating last_seqno: old %u, new %u\n",
 928                         orig_node->last_real_seqno, seqno);
 929                 orig_node->last_real_seqno = seqno;
 930         }
 931
 932         ret = is_duplicate;
 933
 934 out:
 935         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 936         batadv_orig_node_free_ref(orig_node);
 937         return ret;
 938 }
 939
 940 static void bat_iv_ogm_process(const struct ethhdr *ethhdr,
 941                                struct batman_ogm_packet *batman_ogm_packet,
 942                                const unsigned char *tt_buff,
 943                                struct hard_iface *if_incoming)
 944 {
 945         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 946         struct hard_iface *hard_iface;
 947         struct orig_node *orig_neigh_node, *orig_node;
 948         struct neigh_node *router = NULL, *router_router = NULL;
 949         struct neigh_node *orig_neigh_router = NULL;
 950         int has_directlink_flag;
 951         int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 952         int is_broadcast = 0, is_bidirectional;
 953         bool is_single_hop_neigh = false;
 954         bool is_from_best_next_hop = false;
 955         int is_duplicate;
 956         uint32_t if_incoming_seqno;
 957
 958         /* Silently drop when the batman packet is actually not a
 959          * correct packet.
 960          *
 961          * This might happen if a packet is padded (e.g. Ethernet has a
 962          * minimum frame length of 64 byte) and the aggregation interprets
 963          * it as an additional length.
 964          *
 965          * TODO: A more sane solution would be to have a bit in the
 966          * batman_ogm_packet to detect whether the packet is the last
 967          * packet in an aggregation.  Here we expect that the padding
 968          * is always zero (or not 0x01)
 969          */
 970         if (batman_ogm_packet->header.packet_type != BAT_IV_OGM)
 971                 return;
 972
 973         /* could be changed by schedule_own_packet() */
 974         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 975
 976         has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
 977
 978         if (compare_eth(ethhdr->h_source, batman_ogm_packet->orig))
 979                 is_single_hop_neigh = true;
 980
 981         bat_dbg(DBG_BATMAN, bat_priv,
 982                 "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",
 983                 ethhdr->h_source, if_incoming->net_dev->name,
 984                 if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,
 985                 batman_ogm_packet->prev_sender, ntohl(batman_ogm_packet->seqno),
 986                 batman_ogm_packet->ttvn, ntohs(batman_ogm_packet->tt_crc),
 987                 batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,
 988                 batman_ogm_packet->header.ttl,
 989                 batman_ogm_packet->header.version, has_directlink_flag);
 990
 991         rcu_read_lock();
 992         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 993                 if (hard_iface->if_status != IF_ACTIVE)
 994                         continue;
 995
 996                 if (hard_iface->soft_iface != if_incoming->soft_iface)
 997                         continue;
 998
 999                 if (compare_eth(ethhdr->h_source,
1000                                 hard_iface->net_dev->dev_addr))
1001                         is_my_addr = 1;
1002
1003                 if (compare_eth(batman_ogm_packet->orig,
1004                                 hard_iface->net_dev->dev_addr))
1005                         is_my_orig = 1;
1006
1007                 if (compare_eth(batman_ogm_packet->prev_sender,
1008                                 hard_iface->net_dev->dev_addr))
1009                         is_my_oldorig = 1;
1010
1011                 if (is_broadcast_ether_addr(ethhdr->h_source))
1012                         is_broadcast = 1;
1013         }
1014         rcu_read_unlock();
1015
1016         if (batman_ogm_packet->header.version != COMPAT_VERSION) {
1017                 bat_dbg(DBG_BATMAN, bat_priv,
1018                         "Drop packet: incompatible batman version (%i)\n",
1019                         batman_ogm_packet->header.version);
1020                 return;
1021         }
1022
1023         if (is_my_addr) {
1024                 bat_dbg(DBG_BATMAN, bat_priv,
1025                         "Drop packet: received my own broadcast (sender: %pM)\n",
1026                         ethhdr->h_source);
1027                 return;
1028         }
1029
1030         if (is_broadcast) {
1031                 bat_dbg(DBG_BATMAN, bat_priv,
1032                         "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1033                         ethhdr->h_source);
1034                 return;
1035         }
1036
1037         if (is_my_orig) {
1038                 unsigned long *word;
1039                 int offset;
1040                 int32_t bit_pos;
1041
1042                 orig_neigh_node = batadv_get_orig_node(bat_priv,
1043                                                        ethhdr->h_source);
1044                 if (!orig_neigh_node)
1045                         return;
1046
1047                 /* neighbor has to indicate direct link and it has to
1048                  * come via the corresponding interface
1049                  * save packet seqno for bidirectional check
1050                  */
1051                 if (has_directlink_flag &&
1052                     compare_eth(if_incoming->net_dev->dev_addr,
1053                                 batman_ogm_packet->orig)) {
1054                         offset = if_incoming->if_num * NUM_WORDS;
1055
1056                         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1057                         word = &(orig_neigh_node->bcast_own[offset]);
1058                         bit_pos = if_incoming_seqno - 2;
1059                         bit_pos -= ntohl(batman_ogm_packet->seqno);
1060                         batadv_set_bit(word, bit_pos);
1061                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
1062                                 bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE);
1063                         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1064                 }
1065
1066                 bat_dbg(DBG_BATMAN, bat_priv,
1067                         "Drop packet: originator packet from myself (via neighbor)\n");
1068                 batadv_orig_node_free_ref(orig_neigh_node);
1069                 return;
1070         }
1071
1072         if (is_my_oldorig) {
1073                 bat_dbg(DBG_BATMAN, bat_priv,
1074                         "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1075                         ethhdr->h_source);
1076                 return;
1077         }
1078
1079         if (batman_ogm_packet->flags & NOT_BEST_NEXT_HOP) {
1080                 bat_dbg(DBG_BATMAN, bat_priv,
1081                         "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1082                         ethhdr->h_source);
1083                 return;
1084         }
1085
1086         orig_node = batadv_get_orig_node(bat_priv, batman_ogm_packet->orig);
1087         if (!orig_node)
1088                 return;
1089
1090         is_duplicate = bat_iv_ogm_update_seqnos(ethhdr, batman_ogm_packet,
1091                                                 if_incoming);
1092
1093         if (is_duplicate == -1) {
1094                 bat_dbg(DBG_BATMAN, bat_priv,
1095                         "Drop packet: packet within seqno protection time (sender: %pM)\n",
1096                         ethhdr->h_source);
1097                 goto out;
1098         }
1099
1100         if (batman_ogm_packet->tq == 0) {
1101                 bat_dbg(DBG_BATMAN, bat_priv,
1102                         "Drop packet: originator packet with tq equal 0\n");
1103                 goto out;
1104         }
1105
1106         router = batadv_orig_node_get_router(orig_node);
1107         if (router)
1108                 router_router = batadv_orig_node_get_router(router->orig_node);
1109
1110         if ((router && router->tq_avg != 0) &&
1111             (compare_eth(router->addr, ethhdr->h_source)))
1112                 is_from_best_next_hop = true;
1113
1114         /* avoid temporary routing loops */
1115         if (router && router_router &&
1116             (compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&
1117             !(compare_eth(batman_ogm_packet->orig,
1118                           batman_ogm_packet->prev_sender)) &&
1119             (compare_eth(router->addr, router_router->addr))) {
1120                 bat_dbg(DBG_BATMAN, bat_priv,
1121                         "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1122                         ethhdr->h_source);
1123                 goto out;
1124         }
1125
1126         /* if sender is a direct neighbor the sender mac equals
1127          * originator mac
1128          */
1129         orig_neigh_node = (is_single_hop_neigh ?
1130                            orig_node :
1131                            batadv_get_orig_node(bat_priv, ethhdr->h_source));
1132         if (!orig_neigh_node)
1133                 goto out;
1134
1135         orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1136
1137         /* drop packet if sender is not a direct neighbor and if we
1138          * don't route towards it
1139          */
1140         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1141                 bat_dbg(DBG_BATMAN, bat_priv,
1142                         "Drop packet: OGM via unknown neighbor!\n");
1143                 goto out_neigh;
1144         }
1145
1146         is_bidirectional = bat_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1147                                               batman_ogm_packet, if_incoming);
1148
1149         batadv_bonding_save_primary(orig_node, orig_neigh_node,
1150                                     batman_ogm_packet);
1151
1152         /* update ranking if it is not a duplicate or has the same
1153          * seqno and similar ttl as the non-duplicate
1154          */
1155         if (is_bidirectional &&
1156             (!is_duplicate ||
1157              ((orig_node->last_real_seqno == ntohl(batman_ogm_packet->seqno)) &&
1158               (orig_node->last_ttl - 3 <= batman_ogm_packet->header.ttl))))
1159                 bat_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1160                                        batman_ogm_packet, if_incoming,
1161                                        tt_buff, is_duplicate);
1162
1163         /* is single hop (direct) neighbor */
1164         if (is_single_hop_neigh) {
1165
1166                 /* mark direct link on incoming interface */
1167                 bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1168                                    is_single_hop_neigh, is_from_best_next_hop,
1169                                    if_incoming);
1170
1171                 bat_dbg(DBG_BATMAN, bat_priv,
1172                         "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1173                 goto out_neigh;
1174         }
1175
1176         /* multihop originator */
1177         if (!is_bidirectional) {
1178                 bat_dbg(DBG_BATMAN, bat_priv,
1179                         "Drop packet: not received via bidirectional link\n");
1180                 goto out_neigh;
1181         }
1182
1183         if (is_duplicate) {
1184                 bat_dbg(DBG_BATMAN, bat_priv,
1185                         "Drop packet: duplicate packet received\n");
1186                 goto out_neigh;
1187         }
1188
1189         bat_dbg(DBG_BATMAN, bat_priv,
1190                 "Forwarding packet: rebroadcast originator packet\n");
1191         bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1192                            is_single_hop_neigh, is_from_best_next_hop,
1193                            if_incoming);
1194
1195 out_neigh:
1196         if ((orig_neigh_node) && (!is_single_hop_neigh))
1197                 batadv_orig_node_free_ref(orig_neigh_node);
1198 out:
1199         if (router)
1200                 batadv_neigh_node_free_ref(router);
1201         if (router_router)
1202                 batadv_neigh_node_free_ref(router_router);
1203         if (orig_neigh_router)
1204                 batadv_neigh_node_free_ref(orig_neigh_router);
1205
1206         batadv_orig_node_free_ref(orig_node);
1207 }
1208
1209 static int bat_iv_ogm_receive(struct sk_buff *skb,
1210                               struct hard_iface *if_incoming)
1211 {
1212         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1213         struct batman_ogm_packet *batman_ogm_packet;
1214         struct ethhdr *ethhdr;
1215         int buff_pos = 0, packet_len;
1216         unsigned char *tt_buff, *packet_buff;
1217         bool ret;
1218
1219         ret = batadv_check_management_packet(skb, if_incoming, BATMAN_OGM_HLEN);
1220         if (!ret)
1221                 return NET_RX_DROP;
1222
1223         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1224          * that does not have B.A.T.M.A.N. IV enabled ?
1225          */
1226         if (bat_priv->bat_algo_ops->bat_ogm_emit != bat_iv_ogm_emit)
1227                 return NET_RX_DROP;
1228
1229         batadv_inc_counter(bat_priv, BAT_CNT_MGMT_RX);
1230         batadv_add_counter(bat_priv, BAT_CNT_MGMT_RX_BYTES,
1231                            skb->len + ETH_HLEN);
1232
1233         packet_len = skb_headlen(skb);
1234         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1235         packet_buff = skb->data;
1236         batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
1237
1238         /* unpack the aggregated packets and process them one by one */
1239         do {
1240                 tt_buff = packet_buff + buff_pos + BATMAN_OGM_HLEN;
1241
1242                 bat_iv_ogm_process(ethhdr, batman_ogm_packet,
1243                                    tt_buff, if_incoming);
1244
1245                 buff_pos += BATMAN_OGM_HLEN;
1246                 buff_pos += batadv_tt_len(batman_ogm_packet->tt_num_changes);
1247
1248                 batman_ogm_packet = (struct batman_ogm_packet *)
1249                                                 (packet_buff + buff_pos);
1250         } while (bat_iv_ogm_aggr_packet(buff_pos, packet_len,
1251                                         batman_ogm_packet->tt_num_changes));
1252
1253         kfree_skb(skb);
1254         return NET_RX_SUCCESS;
1255 }
1256
1257 static struct bat_algo_ops batman_iv __read_mostly = {
1258         .name = "BATMAN_IV",
1259         .bat_iface_enable = bat_iv_ogm_iface_enable,
1260         .bat_iface_disable = bat_iv_ogm_iface_disable,
1261         .bat_iface_update_mac = bat_iv_ogm_iface_update_mac,
1262         .bat_primary_iface_set = bat_iv_ogm_primary_iface_set,
1263         .bat_ogm_schedule = bat_iv_ogm_schedule,
1264         .bat_ogm_emit = bat_iv_ogm_emit,
1265 };
1266
1267 int __init batadv_iv_init(void)
1268 {
1269         int ret;
1270
1271         /* batman originator packet */
1272         ret = batadv_recv_handler_register(BAT_IV_OGM, bat_iv_ogm_receive);
1273         if (ret < 0)
1274                 goto out;
1275
1276         ret = batadv_algo_register(&batman_iv);
1277         if (ret < 0)
1278                 goto handler_unregister;
1279
1280         goto out;
1281
1282 handler_unregister:
1283         batadv_recv_handler_unregister(BAT_IV_OGM);
1284 out:
1285         return ret;
1286 }