net/batman-adv/bat_iv_ogm.c

   1 /* Copyright (C) 2007-2013 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 #include "network-coding.h"
  31
  32 static struct batadv_neigh_node *
  33 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
  34                         const uint8_t *neigh_addr,
  35                         struct batadv_orig_node *orig_node,
  36                         struct batadv_orig_node *orig_neigh, __be32 seqno)
  37 {
  38         struct batadv_neigh_node *neigh_node;
  39
  40         neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr,
  41                                            ntohl(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 batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
  59 {
  60         struct batadv_ogm_packet *batadv_ogm_packet;
  61         unsigned char *ogm_buff;
  62         uint32_t random_seqno;
  63         int res = -ENOMEM;
  64
  65         /* randomize initial seqno to avoid collision */
  66         get_random_bytes(&random_seqno, sizeof(random_seqno));
  67         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
  68
  69         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
  70         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
  71         if (!ogm_buff)
  72                 goto out;
  73
  74         hard_iface->bat_iv.ogm_buff = ogm_buff;
  75
  76         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
  77         batadv_ogm_packet->header.packet_type = BATADV_IV_OGM;
  78         batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION;
  79         batadv_ogm_packet->header.ttl = 2;
  80         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
  81         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
  82         batadv_ogm_packet->tt_num_changes = 0;
  83         batadv_ogm_packet->ttvn = 0;
  84
  85         res = 0;
  86
  87 out:
  88         return res;
  89 }
  90
  91 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
  92 {
  93         kfree(hard_iface->bat_iv.ogm_buff);
  94         hard_iface->bat_iv.ogm_buff = NULL;
  95 }
  96
  97 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
  98 {
  99         struct batadv_ogm_packet *batadv_ogm_packet;
 100         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 101
 102         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 103         memcpy(batadv_ogm_packet->orig,
 104                hard_iface->net_dev->dev_addr, ETH_ALEN);
 105         memcpy(batadv_ogm_packet->prev_sender,
 106                hard_iface->net_dev->dev_addr, ETH_ALEN);
 107 }
 108
 109 static void
 110 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 111 {
 112         struct batadv_ogm_packet *batadv_ogm_packet;
 113         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 114
 115         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 116         batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
 117         batadv_ogm_packet->header.ttl = BATADV_TTL;
 118 }
 119
 120 /* when do we schedule our own ogm to be sent */
 121 static unsigned long
 122 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 123 {
 124         unsigned int msecs;
 125
 126         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 127         msecs += prandom_u32() % (2 * BATADV_JITTER);
 128
 129         return jiffies + msecs_to_jiffies(msecs);
 130 }
 131
 132 /* when do we schedule a ogm packet to be sent */
 133 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 134 {
 135         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 136 }
 137
 138 /* apply hop penalty for a normal link */
 139 static uint8_t batadv_hop_penalty(uint8_t tq,
 140                                   const struct batadv_priv *bat_priv)
 141 {
 142         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 143         int new_tq;
 144
 145         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 146         new_tq /= BATADV_TQ_MAX_VALUE;
 147
 148         return new_tq;
 149 }
 150
 151 /* is there another aggregated packet here? */
 152 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 153                                      int tt_num_changes)
 154 {
 155         int next_buff_pos = 0;
 156
 157         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 158         next_buff_pos += batadv_tt_len(tt_num_changes);
 159
 160         return (next_buff_pos <= packet_len) &&
 161                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 162 }
 163
 164 /* send a batman ogm to a given interface */
 165 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 166                                      struct batadv_hard_iface *hard_iface)
 167 {
 168         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 169         char *fwd_str;
 170         uint8_t packet_num;
 171         int16_t buff_pos;
 172         struct batadv_ogm_packet *batadv_ogm_packet;
 173         struct sk_buff *skb;
 174         uint8_t *packet_pos;
 175
 176         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 177                 return;
 178
 179         packet_num = 0;
 180         buff_pos = 0;
 181         packet_pos = forw_packet->skb->data;
 182         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 183
 184         /* adjust all flags and log packets */
 185         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 186                                          batadv_ogm_packet->tt_num_changes)) {
 187                 /* we might have aggregated direct link packets with an
 188                  * ordinary base packet
 189                  */
 190                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 191                     forw_packet->if_incoming == hard_iface)
 192                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 193                 else
 194                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 195
 196                 if (packet_num > 0 || !forw_packet->own)
 197                         fwd_str = "Forwarding";
 198                 else
 199                         fwd_str = "Sending own";
 200
 201                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 202                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
 203                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 204                            batadv_ogm_packet->orig,
 205                            ntohl(batadv_ogm_packet->seqno),
 206                            batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
 207                            (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
 208                             "on" : "off"),
 209                            batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
 210                            hard_iface->net_dev->dev_addr);
 211
 212                 buff_pos += BATADV_OGM_HLEN;
 213                 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
 214                 packet_num++;
 215                 packet_pos = forw_packet->skb->data + buff_pos;
 216                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 217         }
 218
 219         /* create clone because function is called more than once */
 220         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 221         if (skb) {
 222                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 223                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 224                                    skb->len + ETH_HLEN);
 225                 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 226         }
 227 }
 228
 229 /* send a batman ogm packet */
 230 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 231 {
 232         struct batadv_hard_iface *hard_iface;
 233         struct net_device *soft_iface;
 234         struct batadv_priv *bat_priv;
 235         struct batadv_hard_iface *primary_if = NULL;
 236         struct batadv_ogm_packet *batadv_ogm_packet;
 237         unsigned char directlink;
 238         uint8_t *packet_pos;
 239
 240         packet_pos = forw_packet->skb->data;
 241         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 242         directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
 243
 244         if (!forw_packet->if_incoming) {
 245                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 246                 goto out;
 247         }
 248
 249         soft_iface = forw_packet->if_incoming->soft_iface;
 250         bat_priv = netdev_priv(soft_iface);
 251
 252         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 253                 goto out;
 254
 255         primary_if = batadv_primary_if_get_selected(bat_priv);
 256         if (!primary_if)
 257                 goto out;
 258
 259         /* multihomed peer assumed
 260          * non-primary OGMs are only broadcasted on their interface
 261          */
 262         if ((directlink && (batadv_ogm_packet->header.ttl == 1)) ||
 263             (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
 264                 /* FIXME: what about aggregated packets ? */
 265                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 266                            "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
 267                            (forw_packet->own ? "Sending own" : "Forwarding"),
 268                            batadv_ogm_packet->orig,
 269                            ntohl(batadv_ogm_packet->seqno),
 270                            batadv_ogm_packet->header.ttl,
 271                            forw_packet->if_incoming->net_dev->name,
 272                            forw_packet->if_incoming->net_dev->dev_addr);
 273
 274                 /* skb is only used once and than forw_packet is free'd */
 275                 batadv_send_skb_packet(forw_packet->skb,
 276                                        forw_packet->if_incoming,
 277                                        batadv_broadcast_addr);
 278                 forw_packet->skb = NULL;
 279
 280                 goto out;
 281         }
 282
 283         /* broadcast on every interface */
 284         rcu_read_lock();
 285         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 286                 if (hard_iface->soft_iface != soft_iface)
 287                         continue;
 288
 289                 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
 290         }
 291         rcu_read_unlock();
 292
 293 out:
 294         if (primary_if)
 295                 batadv_hardif_free_ref(primary_if);
 296 }
 297
 298 /* return true if new_packet can be aggregated with forw_packet */
 299 static bool
 300 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 301                             struct batadv_priv *bat_priv,
 302                             int packet_len, unsigned long send_time,
 303                             bool directlink,
 304                             const struct batadv_hard_iface *if_incoming,
 305                             const struct batadv_forw_packet *forw_packet)
 306 {
 307         struct batadv_ogm_packet *batadv_ogm_packet;
 308         int aggregated_bytes = forw_packet->packet_len + packet_len;
 309         struct batadv_hard_iface *primary_if = NULL;
 310         bool res = false;
 311         unsigned long aggregation_end_time;
 312
 313         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 314         aggregation_end_time = send_time;
 315         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 316
 317         /* we can aggregate the current packet to this aggregated packet
 318          * if:
 319          *
 320          * - the send time is within our MAX_AGGREGATION_MS time
 321          * - the resulting packet wont be bigger than
 322          *   MAX_AGGREGATION_BYTES
 323          */
 324         if (time_before(send_time, forw_packet->send_time) &&
 325             time_after_eq(aggregation_end_time, forw_packet->send_time) &&
 326             (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
 327                 /* check aggregation compatibility
 328                  * -> direct link packets are broadcasted on
 329                  *    their interface only
 330                  * -> aggregate packet if the current packet is
 331                  *    a "global" packet as well as the base
 332                  *    packet
 333                  */
 334                 primary_if = batadv_primary_if_get_selected(bat_priv);
 335                 if (!primary_if)
 336                         goto out;
 337
 338                 /* packets without direct link flag and high TTL
 339                  * are flooded through the net
 340                  */
 341                 if ((!directlink) &&
 342                     (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
 343                     (batadv_ogm_packet->header.ttl != 1) &&
 344
 345                     /* own packets originating non-primary
 346                      * interfaces leave only that interface
 347                      */
 348                     ((!forw_packet->own) ||
 349                      (forw_packet->if_incoming == primary_if))) {
 350                         res = true;
 351                         goto out;
 352                 }
 353
 354                 /* if the incoming packet is sent via this one
 355                  * interface only - we still can aggregate
 356                  */
 357                 if ((directlink) &&
 358                     (new_bat_ogm_packet->header.ttl == 1) &&
 359                     (forw_packet->if_incoming == if_incoming) &&
 360
 361                     /* packets from direct neighbors or
 362                      * own secondary interface packets
 363                      * (= secondary interface packets in general)
 364                      */
 365                     (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 366                      (forw_packet->own &&
 367                       forw_packet->if_incoming != primary_if))) {
 368                         res = true;
 369                         goto out;
 370                 }
 371         }
 372
 373 out:
 374         if (primary_if)
 375                 batadv_hardif_free_ref(primary_if);
 376         return res;
 377 }
 378
 379 /* create a new aggregated packet and add this packet to it */
 380 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 381                                         int packet_len, unsigned long send_time,
 382                                         bool direct_link,
 383                                         struct batadv_hard_iface *if_incoming,
 384                                         int own_packet)
 385 {
 386         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 387         struct batadv_forw_packet *forw_packet_aggr;
 388         unsigned char *skb_buff;
 389         unsigned int skb_size;
 390
 391         if (!atomic_inc_not_zero(&if_incoming->refcount))
 392                 return;
 393
 394         /* own packet should always be scheduled */
 395         if (!own_packet) {
 396                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 397                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 398                                    "batman packet queue full\n");
 399                         goto out;
 400                 }
 401         }
 402
 403         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 404         if (!forw_packet_aggr) {
 405                 if (!own_packet)
 406                         atomic_inc(&bat_priv->batman_queue_left);
 407                 goto out;
 408         }
 409
 410         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 411             (packet_len < BATADV_MAX_AGGREGATION_BYTES))
 412                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 413         else
 414                 skb_size = packet_len;
 415
 416         skb_size += ETH_HLEN + NET_IP_ALIGN;
 417
 418         forw_packet_aggr->skb = dev_alloc_skb(skb_size);
 419         if (!forw_packet_aggr->skb) {
 420                 if (!own_packet)
 421                         atomic_inc(&bat_priv->batman_queue_left);
 422                 kfree(forw_packet_aggr);
 423                 goto out;
 424         }
 425         skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN);
 426
 427         INIT_HLIST_NODE(&forw_packet_aggr->list);
 428
 429         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 430         forw_packet_aggr->packet_len = packet_len;
 431         memcpy(skb_buff, packet_buff, packet_len);
 432
 433         forw_packet_aggr->own = own_packet;
 434         forw_packet_aggr->if_incoming = if_incoming;
 435         forw_packet_aggr->num_packets = 0;
 436         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 437         forw_packet_aggr->send_time = send_time;
 438
 439         /* save packet direct link flag status */
 440         if (direct_link)
 441                 forw_packet_aggr->direct_link_flags |= 1;
 442
 443         /* add new packet to packet list */
 444         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 445         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 446         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 447
 448         /* start timer for this packet */
 449         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 450                           batadv_send_outstanding_bat_ogm_packet);
 451         queue_delayed_work(batadv_event_workqueue,
 452                            &forw_packet_aggr->delayed_work,
 453                            send_time - jiffies);
 454
 455         return;
 456 out:
 457         batadv_hardif_free_ref(if_incoming);
 458 }
 459
 460 /* aggregate a new packet into the existing ogm packet */
 461 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 462                                     const unsigned char *packet_buff,
 463                                     int packet_len, bool direct_link)
 464 {
 465         unsigned char *skb_buff;
 466         unsigned long new_direct_link_flag;
 467
 468         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 469         memcpy(skb_buff, packet_buff, packet_len);
 470         forw_packet_aggr->packet_len += packet_len;
 471         forw_packet_aggr->num_packets++;
 472
 473         /* save packet direct link flag status */
 474         if (direct_link) {
 475                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 476                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 477         }
 478 }
 479
 480 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 481                                     unsigned char *packet_buff,
 482                                     int packet_len,
 483                                     struct batadv_hard_iface *if_incoming,
 484                                     int own_packet, unsigned long send_time)
 485 {
 486         /* _aggr -> pointer to the packet we want to aggregate with
 487          * _pos -> pointer to the position in the queue
 488          */
 489         struct batadv_forw_packet *forw_packet_aggr = NULL;
 490         struct batadv_forw_packet *forw_packet_pos = NULL;
 491         struct batadv_ogm_packet *batadv_ogm_packet;
 492         bool direct_link;
 493         unsigned long max_aggregation_jiffies;
 494
 495         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 496         direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
 497         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 498
 499         /* find position for the packet in the forward queue */
 500         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 501         /* own packets are not to be aggregated */
 502         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 503                 hlist_for_each_entry(forw_packet_pos,
 504                                      &bat_priv->forw_bat_list, list) {
 505                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 506                                                         bat_priv, packet_len,
 507                                                         send_time, direct_link,
 508                                                         if_incoming,
 509                                                         forw_packet_pos)) {
 510                                 forw_packet_aggr = forw_packet_pos;
 511                                 break;
 512                         }
 513                 }
 514         }
 515
 516         /* nothing to aggregate with - either aggregation disabled or no
 517          * suitable aggregation packet found
 518          */
 519         if (!forw_packet_aggr) {
 520                 /* the following section can run without the lock */
 521                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 522
 523                 /* if we could not aggregate this packet with one of the others
 524                  * we hold it back for a while, so that it might be aggregated
 525                  * later on
 526                  */
 527                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 528                         send_time += max_aggregation_jiffies;
 529
 530                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 531                                             send_time, direct_link,
 532                                             if_incoming, own_packet);
 533         } else {
 534                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 535                                         packet_len, direct_link);
 536                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 537         }
 538 }
 539
 540 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 541                                   const struct ethhdr *ethhdr,
 542                                   struct batadv_ogm_packet *batadv_ogm_packet,
 543                                   bool is_single_hop_neigh,
 544                                   bool is_from_best_next_hop,
 545                                   struct batadv_hard_iface *if_incoming)
 546 {
 547         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 548         uint8_t tt_num_changes;
 549
 550         if (batadv_ogm_packet->header.ttl <= 1) {
 551                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 552                 return;
 553         }
 554
 555         if (!is_from_best_next_hop) {
 556                 /* Mark the forwarded packet when it is not coming from our
 557                  * best next hop. We still need to forward the packet for our
 558                  * neighbor link quality detection to work in case the packet
 559                  * originated from a single hop neighbor. Otherwise we can
 560                  * simply drop the ogm.
 561                  */
 562                 if (is_single_hop_neigh)
 563                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 564                 else
 565                         return;
 566         }
 567
 568         tt_num_changes = batadv_ogm_packet->tt_num_changes;
 569
 570         batadv_ogm_packet->header.ttl--;
 571         memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 572
 573         /* apply hop penalty */
 574         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 575                                                    bat_priv);
 576
 577         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 578                    "Forwarding packet: tq: %i, ttl: %i\n",
 579                    batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
 580
 581         /* switch of primaries first hop flag when forwarding */
 582         batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
 583         if (is_single_hop_neigh)
 584                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 585         else
 586                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 587
 588         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 589                                 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
 590                                 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
 591 }
 592
 593 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 594 {
 595         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 596         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 597         struct batadv_ogm_packet *batadv_ogm_packet;
 598         struct batadv_hard_iface *primary_if;
 599         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 600         int vis_server, tt_num_changes = 0;
 601         uint32_t seqno;
 602         uint8_t bandwidth;
 603
 604         vis_server = atomic_read(&bat_priv->vis_mode);
 605         primary_if = batadv_primary_if_get_selected(bat_priv);
 606
 607         if (hard_iface == primary_if)
 608                 tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff,
 609                                                        ogm_buff_len,
 610                                                        BATADV_OGM_HLEN);
 611
 612         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 613
 614         /* change sequence number to network order */
 615         seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 616         batadv_ogm_packet->seqno = htonl(seqno);
 617         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 618
 619         batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
 620         batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
 621         if (tt_num_changes >= 0)
 622                 batadv_ogm_packet->tt_num_changes = tt_num_changes;
 623
 624         if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
 625                 batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
 626         else
 627                 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
 628
 629         if (hard_iface == primary_if &&
 630             atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) {
 631                 bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 632                 batadv_ogm_packet->gw_flags = bandwidth;
 633         } else {
 634                 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
 635         }
 636
 637         batadv_slide_own_bcast_window(hard_iface);
 638         batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
 639                                 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
 640                                 batadv_iv_ogm_emit_send_time(bat_priv));
 641
 642         if (primary_if)
 643                 batadv_hardif_free_ref(primary_if);
 644 }
 645
 646 static void
 647 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 648                           struct batadv_orig_node *orig_node,
 649                           const struct ethhdr *ethhdr,
 650                           const struct batadv_ogm_packet *batadv_ogm_packet,
 651                           struct batadv_hard_iface *if_incoming,
 652                           const unsigned char *tt_buff,
 653                           int is_duplicate)
 654 {
 655         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 656         struct batadv_neigh_node *router = NULL;
 657         struct batadv_orig_node *orig_node_tmp;
 658         int if_num;
 659         uint8_t sum_orig, sum_neigh;
 660         uint8_t *neigh_addr;
 661         uint8_t tq_avg;
 662
 663         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 664                    "update_originator(): Searching and updating originator entry of received packet\n");
 665
 666         rcu_read_lock();
 667         hlist_for_each_entry_rcu(tmp_neigh_node,
 668                                  &orig_node->neigh_list, list) {
 669                 neigh_addr = tmp_neigh_node->addr;
 670                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 671                     tmp_neigh_node->if_incoming == if_incoming &&
 672                     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 673                         if (neigh_node)
 674                                 batadv_neigh_node_free_ref(neigh_node);
 675                         neigh_node = tmp_neigh_node;
 676                         continue;
 677                 }
 678
 679                 if (is_duplicate)
 680                         continue;
 681
 682                 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
 683                 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
 684                                        &tmp_neigh_node->tq_index, 0);
 685                 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
 686                 tmp_neigh_node->tq_avg = tq_avg;
 687                 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
 688         }
 689
 690         if (!neigh_node) {
 691                 struct batadv_orig_node *orig_tmp;
 692
 693                 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
 694                 if (!orig_tmp)
 695                         goto unlock;
 696
 697                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
 698                                                      ethhdr->h_source,
 699                                                      orig_node, orig_tmp,
 700                                                      batadv_ogm_packet->seqno);
 701
 702                 batadv_orig_node_free_ref(orig_tmp);
 703                 if (!neigh_node)
 704                         goto unlock;
 705         } else
 706                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 707                            "Updating existing last-hop neighbor of originator\n");
 708
 709         rcu_read_unlock();
 710
 711         orig_node->flags = batadv_ogm_packet->flags;
 712         neigh_node->last_seen = jiffies;
 713
 714         spin_lock_bh(&neigh_node->lq_update_lock);
 715         batadv_ring_buffer_set(neigh_node->tq_recv,
 716                                &neigh_node->tq_index,
 717                                batadv_ogm_packet->tq);
 718         neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
 719         spin_unlock_bh(&neigh_node->lq_update_lock);
 720
 721         if (!is_duplicate) {
 722                 orig_node->last_ttl = batadv_ogm_packet->header.ttl;
 723                 neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
 724         }
 725
 726         batadv_bonding_candidate_add(orig_node, neigh_node);
 727
 728         /* if this neighbor already is our next hop there is nothing
 729          * to change
 730          */
 731         router = batadv_orig_node_get_router(orig_node);
 732         if (router == neigh_node)
 733                 goto update_tt;
 734
 735         /* if this neighbor does not offer a better TQ we won't consider it */
 736         if (router && (router->tq_avg > neigh_node->tq_avg))
 737                 goto update_tt;
 738
 739         /* if the TQ is the same and the link not more symmetric we
 740          * won't consider it either
 741          */
 742         if (router && (neigh_node->tq_avg == router->tq_avg)) {
 743                 orig_node_tmp = router->orig_node;
 744                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 745                 if_num = router->if_incoming->if_num;
 746                 sum_orig = orig_node_tmp->bcast_own_sum[if_num];
 747                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 748
 749                 orig_node_tmp = neigh_node->orig_node;
 750                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 751                 if_num = neigh_node->if_incoming->if_num;
 752                 sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
 753                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 754
 755                 if (sum_orig >= sum_neigh)
 756                         goto update_tt;
 757         }
 758
 759         batadv_update_route(bat_priv, orig_node, neigh_node);
 760
 761 update_tt:
 762         /* I have to check for transtable changes only if the OGM has been
 763          * sent through a primary interface
 764          */
 765         if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
 766              (batadv_ogm_packet->header.ttl > 2)) ||
 767             (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
 768                 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
 769                                       batadv_ogm_packet->tt_num_changes,
 770                                       batadv_ogm_packet->ttvn,
 771                                       ntohs(batadv_ogm_packet->tt_crc));
 772
 773         if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
 774                 batadv_gw_node_update(bat_priv, orig_node,
 775                                       batadv_ogm_packet->gw_flags);
 776
 777         orig_node->gw_flags = batadv_ogm_packet->gw_flags;
 778
 779         /* restart gateway selection if fast or late switching was enabled */
 780         if ((orig_node->gw_flags) &&
 781             (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
 782             (atomic_read(&bat_priv->gw_sel_class) > 2))
 783                 batadv_gw_check_election(bat_priv, orig_node);
 784
 785         goto out;
 786
 787 unlock:
 788         rcu_read_unlock();
 789 out:
 790         if (neigh_node)
 791                 batadv_neigh_node_free_ref(neigh_node);
 792         if (router)
 793                 batadv_neigh_node_free_ref(router);
 794 }
 795
 796 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
 797                                  struct batadv_orig_node *orig_neigh_node,
 798                                  struct batadv_ogm_packet *batadv_ogm_packet,
 799                                  struct batadv_hard_iface *if_incoming)
 800 {
 801         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 802         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
 803         uint8_t total_count;
 804         uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
 805         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
 806         int tq_asym_penalty, inv_asym_penalty, ret = 0;
 807         unsigned int combined_tq;
 808
 809         /* find corresponding one hop neighbor */
 810         rcu_read_lock();
 811         hlist_for_each_entry_rcu(tmp_neigh_node,
 812                                  &orig_neigh_node->neigh_list, list) {
 813                 if (!batadv_compare_eth(tmp_neigh_node->addr,
 814                                         orig_neigh_node->orig))
 815                         continue;
 816
 817                 if (tmp_neigh_node->if_incoming != if_incoming)
 818                         continue;
 819
 820                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 821                         continue;
 822
 823                 neigh_node = tmp_neigh_node;
 824                 break;
 825         }
 826         rcu_read_unlock();
 827
 828         if (!neigh_node)
 829                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
 830                                                      orig_neigh_node->orig,
 831                                                      orig_neigh_node,
 832                                                      orig_neigh_node,
 833                                                      batadv_ogm_packet->seqno);
 834
 835         if (!neigh_node)
 836                 goto out;
 837
 838         /* if orig_node is direct neighbor update neigh_node last_seen */
 839         if (orig_node == orig_neigh_node)
 840                 neigh_node->last_seen = jiffies;
 841
 842         orig_node->last_seen = jiffies;
 843
 844         /* find packet count of corresponding one hop neighbor */
 845         spin_lock_bh(&orig_node->ogm_cnt_lock);
 846         orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
 847         neigh_rq_count = neigh_node->real_packet_count;
 848         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 849
 850         /* pay attention to not get a value bigger than 100 % */
 851         if (orig_eq_count > neigh_rq_count)
 852                 total_count = neigh_rq_count;
 853         else
 854                 total_count = orig_eq_count;
 855
 856         /* if we have too few packets (too less data) we set tq_own to zero
 857          * if we receive too few packets it is not considered bidirectional
 858          */
 859         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
 860             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
 861                 tq_own = 0;
 862         else
 863                 /* neigh_node->real_packet_count is never zero as we
 864                  * only purge old information when getting new
 865                  * information
 866                  */
 867                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
 868
 869         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 870          * affect the nearly-symmetric links only a little, but
 871          * punishes asymmetric links more.  This will give a value
 872          * between 0 and TQ_MAX_VALUE
 873          */
 874         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
 875         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
 876         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
 877                             BATADV_TQ_LOCAL_WINDOW_SIZE *
 878                             BATADV_TQ_LOCAL_WINDOW_SIZE;
 879         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
 880         inv_asym_penalty /= neigh_rq_max_cube;
 881         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
 882
 883         combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
 884         combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
 885         batadv_ogm_packet->tq = combined_tq;
 886
 887         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 888                    "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
 889                    orig_node->orig, orig_neigh_node->orig, total_count,
 890                    neigh_rq_count, tq_own,
 891                    tq_asym_penalty, batadv_ogm_packet->tq);
 892
 893         /* if link has the minimum required transmission quality
 894          * consider it bidirectional
 895          */
 896         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
 897                 ret = 1;
 898
 899 out:
 900         if (neigh_node)
 901                 batadv_neigh_node_free_ref(neigh_node);
 902         return ret;
 903 }
 904
 905 /* processes a batman packet for all interfaces, adjusts the sequence number and
 906  * finds out whether it is a duplicate.
 907  * returns:
 908  *   1 the packet is a duplicate
 909  *   0 the packet has not yet been received
 910  *  -1 the packet is old and has been received while the seqno window
 911  *     was protected. Caller should drop it.
 912  */
 913 static int
 914 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
 915                             const struct batadv_ogm_packet *batadv_ogm_packet,
 916                             const struct batadv_hard_iface *if_incoming)
 917 {
 918         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 919         struct batadv_orig_node *orig_node;
 920         struct batadv_neigh_node *tmp_neigh_node;
 921         int is_duplicate = 0;
 922         int32_t seq_diff;
 923         int need_update = 0;
 924         int set_mark, ret = -1;
 925         uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
 926         uint8_t *neigh_addr;
 927         uint8_t packet_count;
 928
 929         orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
 930         if (!orig_node)
 931                 return 0;
 932
 933         spin_lock_bh(&orig_node->ogm_cnt_lock);
 934         seq_diff = seqno - orig_node->last_real_seqno;
 935
 936         /* signalize caller that the packet is to be dropped. */
 937         if (!hlist_empty(&orig_node->neigh_list) &&
 938             batadv_window_protected(bat_priv, seq_diff,
 939                                     &orig_node->batman_seqno_reset))
 940                 goto out;
 941
 942         rcu_read_lock();
 943         hlist_for_each_entry_rcu(tmp_neigh_node,
 944                                  &orig_node->neigh_list, list) {
 945                 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
 946                                                 orig_node->last_real_seqno,
 947                                                 seqno);
 948
 949                 neigh_addr = tmp_neigh_node->addr;
 950                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 951                     tmp_neigh_node->if_incoming == if_incoming)
 952                         set_mark = 1;
 953                 else
 954                         set_mark = 0;
 955
 956                 /* if the window moved, set the update flag. */
 957                 need_update |= batadv_bit_get_packet(bat_priv,
 958                                                      tmp_neigh_node->real_bits,
 959                                                      seq_diff, set_mark);
 960
 961                 packet_count = bitmap_weight(tmp_neigh_node->real_bits,
 962                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
 963                 tmp_neigh_node->real_packet_count = packet_count;
 964         }
 965         rcu_read_unlock();
 966
 967         if (need_update) {
 968                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 969                            "updating last_seqno: old %u, new %u\n",
 970                            orig_node->last_real_seqno, seqno);
 971                 orig_node->last_real_seqno = seqno;
 972         }
 973
 974         ret = is_duplicate;
 975
 976 out:
 977         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 978         batadv_orig_node_free_ref(orig_node);
 979         return ret;
 980 }
 981
 982 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
 983                                   struct batadv_ogm_packet *batadv_ogm_packet,
 984                                   const unsigned char *tt_buff,
 985                                   struct batadv_hard_iface *if_incoming)
 986 {
 987         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 988         struct batadv_hard_iface *hard_iface;
 989         struct batadv_orig_node *orig_neigh_node, *orig_node;
 990         struct batadv_neigh_node *router = NULL, *router_router = NULL;
 991         struct batadv_neigh_node *orig_neigh_router = NULL;
 992         int has_directlink_flag;
 993         int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 994         int is_broadcast = 0, is_bidirect;
 995         bool is_single_hop_neigh = false;
 996         bool is_from_best_next_hop = false;
 997         int is_duplicate, sameseq, simlar_ttl;
 998         uint32_t if_incoming_seqno;
 999         uint8_t *prev_sender;
1000
1001         /* Silently drop when the batman packet is actually not a
1002          * correct packet.
1003          *
1004          * This might happen if a packet is padded (e.g. Ethernet has a
1005          * minimum frame length of 64 byte) and the aggregation interprets
1006          * it as an additional length.
1007          *
1008          * TODO: A more sane solution would be to have a bit in the
1009          * batadv_ogm_packet to detect whether the packet is the last
1010          * packet in an aggregation.  Here we expect that the padding
1011          * is always zero (or not 0x01)
1012          */
1013         if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
1014                 return;
1015
1016         /* could be changed by schedule_own_packet() */
1017         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1018
1019         if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1020                 has_directlink_flag = 1;
1021         else
1022                 has_directlink_flag = 0;
1023
1024         if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1025                 is_single_hop_neigh = true;
1026
1027         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1028                    "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %#.4x, changes %u, tq %d, TTL %d, V %d, IDF %d)\n",
1029                    ethhdr->h_source, if_incoming->net_dev->name,
1030                    if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1031                    batadv_ogm_packet->prev_sender,
1032                    ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1033                    ntohs(batadv_ogm_packet->tt_crc),
1034                    batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1035                    batadv_ogm_packet->header.ttl,
1036                    batadv_ogm_packet->header.version, has_directlink_flag);
1037
1038         rcu_read_lock();
1039         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1040                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1041                         continue;
1042
1043                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1044                         continue;
1045
1046                 if (batadv_compare_eth(ethhdr->h_source,
1047                                        hard_iface->net_dev->dev_addr))
1048                         is_my_addr = 1;
1049
1050                 if (batadv_compare_eth(batadv_ogm_packet->orig,
1051                                        hard_iface->net_dev->dev_addr))
1052                         is_my_orig = 1;
1053
1054                 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1055                                        hard_iface->net_dev->dev_addr))
1056                         is_my_oldorig = 1;
1057
1058                 if (is_broadcast_ether_addr(ethhdr->h_source))
1059                         is_broadcast = 1;
1060         }
1061         rcu_read_unlock();
1062
1063         if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
1064                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1065                            "Drop packet: incompatible batman version (%i)\n",
1066                            batadv_ogm_packet->header.version);
1067                 return;
1068         }
1069
1070         if (is_my_addr) {
1071                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1072                            "Drop packet: received my own broadcast (sender: %pM)\n",
1073                            ethhdr->h_source);
1074                 return;
1075         }
1076
1077         if (is_broadcast) {
1078                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1079                            "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1080                            ethhdr->h_source);
1081                 return;
1082         }
1083
1084         if (is_my_orig) {
1085                 unsigned long *word;
1086                 int offset;
1087                 int32_t bit_pos;
1088                 int16_t if_num;
1089                 uint8_t *weight;
1090
1091                 orig_neigh_node = batadv_get_orig_node(bat_priv,
1092                                                        ethhdr->h_source);
1093                 if (!orig_neigh_node)
1094                         return;
1095
1096                 /* neighbor has to indicate direct link and it has to
1097                  * come via the corresponding interface
1098                  * save packet seqno for bidirectional check
1099                  */
1100                 if (has_directlink_flag &&
1101                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1102                                        batadv_ogm_packet->orig)) {
1103                         if_num = if_incoming->if_num;
1104                         offset = if_num * BATADV_NUM_WORDS;
1105
1106                         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1107                         word = &(orig_neigh_node->bcast_own[offset]);
1108                         bit_pos = if_incoming_seqno - 2;
1109                         bit_pos -= ntohl(batadv_ogm_packet->seqno);
1110                         batadv_set_bit(word, bit_pos);
1111                         weight = &orig_neigh_node->bcast_own_sum[if_num];
1112                         *weight = bitmap_weight(word,
1113                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1114                         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1115                 }
1116
1117                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1118                            "Drop packet: originator packet from myself (via neighbor)\n");
1119                 batadv_orig_node_free_ref(orig_neigh_node);
1120                 return;
1121         }
1122
1123         if (is_my_oldorig) {
1124                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1125                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1126                            ethhdr->h_source);
1127                 return;
1128         }
1129
1130         if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1131                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1132                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1133                            ethhdr->h_source);
1134                 return;
1135         }
1136
1137         orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1138         if (!orig_node)
1139                 return;
1140
1141         is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1142                                                    if_incoming);
1143
1144         if (is_duplicate == -1) {
1145                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1146                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1147                            ethhdr->h_source);
1148                 goto out;
1149         }
1150
1151         if (batadv_ogm_packet->tq == 0) {
1152                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1153                            "Drop packet: originator packet with tq equal 0\n");
1154                 goto out;
1155         }
1156
1157         router = batadv_orig_node_get_router(orig_node);
1158         if (router)
1159                 router_router = batadv_orig_node_get_router(router->orig_node);
1160
1161         if ((router && router->tq_avg != 0) &&
1162             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1163                 is_from_best_next_hop = true;
1164
1165         prev_sender = batadv_ogm_packet->prev_sender;
1166         /* avoid temporary routing loops */
1167         if (router && router_router &&
1168             (batadv_compare_eth(router->addr, prev_sender)) &&
1169             !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1170             (batadv_compare_eth(router->addr, router_router->addr))) {
1171                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1172                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1173                            ethhdr->h_source);
1174                 goto out;
1175         }
1176
1177         /* if sender is a direct neighbor the sender mac equals
1178          * originator mac
1179          */
1180         if (is_single_hop_neigh)
1181                 orig_neigh_node = orig_node;
1182         else
1183                 orig_neigh_node = batadv_get_orig_node(bat_priv,
1184                                                        ethhdr->h_source);
1185
1186         if (!orig_neigh_node)
1187                 goto out;
1188
1189         /* Update nc_nodes of the originator */
1190         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1191                                  batadv_ogm_packet, is_single_hop_neigh);
1192
1193         orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1194
1195         /* drop packet if sender is not a direct neighbor and if we
1196          * don't route towards it
1197          */
1198         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1199                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1200                            "Drop packet: OGM via unknown neighbor!\n");
1201                 goto out_neigh;
1202         }
1203
1204         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1205                                             batadv_ogm_packet, if_incoming);
1206
1207         batadv_bonding_save_primary(orig_node, orig_neigh_node,
1208                                     batadv_ogm_packet);
1209
1210         /* update ranking if it is not a duplicate or has the same
1211          * seqno and similar ttl as the non-duplicate
1212          */
1213         sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1214         simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
1215         if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
1216                 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1217                                           batadv_ogm_packet, if_incoming,
1218                                           tt_buff, is_duplicate);
1219
1220         /* is single hop (direct) neighbor */
1221         if (is_single_hop_neigh) {
1222                 /* mark direct link on incoming interface */
1223                 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1224                                       is_single_hop_neigh,
1225                                       is_from_best_next_hop, if_incoming);
1226
1227                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1228                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1229                 goto out_neigh;
1230         }
1231
1232         /* multihop originator */
1233         if (!is_bidirect) {
1234                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1235                            "Drop packet: not received via bidirectional link\n");
1236                 goto out_neigh;
1237         }
1238
1239         if (is_duplicate) {
1240                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1241                            "Drop packet: duplicate packet received\n");
1242                 goto out_neigh;
1243         }
1244
1245         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1246                    "Forwarding packet: rebroadcast originator packet\n");
1247         batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1248                               is_single_hop_neigh, is_from_best_next_hop,
1249                               if_incoming);
1250
1251 out_neigh:
1252         if ((orig_neigh_node) && (!is_single_hop_neigh))
1253                 batadv_orig_node_free_ref(orig_neigh_node);
1254 out:
1255         if (router)
1256                 batadv_neigh_node_free_ref(router);
1257         if (router_router)
1258                 batadv_neigh_node_free_ref(router_router);
1259         if (orig_neigh_router)
1260                 batadv_neigh_node_free_ref(orig_neigh_router);
1261
1262         batadv_orig_node_free_ref(orig_node);
1263 }
1264
1265 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1266                                  struct batadv_hard_iface *if_incoming)
1267 {
1268         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1269         struct batadv_ogm_packet *batadv_ogm_packet;
1270         struct ethhdr *ethhdr;
1271         int buff_pos = 0, packet_len;
1272         unsigned char *tt_buff, *packet_buff;
1273         bool ret;
1274         uint8_t *packet_pos;
1275
1276         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1277         if (!ret)
1278                 return NET_RX_DROP;
1279
1280         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1281          * that does not have B.A.T.M.A.N. IV enabled ?
1282          */
1283         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1284                 return NET_RX_DROP;
1285
1286         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1287         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1288                            skb->len + ETH_HLEN);
1289
1290         packet_len = skb_headlen(skb);
1291         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1292         packet_buff = skb->data;
1293         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1294
1295         /* unpack the aggregated packets and process them one by one */
1296         while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1297                                          batadv_ogm_packet->tt_num_changes)) {
1298                 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1299
1300                 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
1301                                       if_incoming);
1302
1303                 buff_pos += BATADV_OGM_HLEN;
1304                 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
1305
1306                 packet_pos = packet_buff + buff_pos;
1307                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1308         }
1309
1310         kfree_skb(skb);
1311         return NET_RX_SUCCESS;
1312 }
1313
1314 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1315         .name = "BATMAN_IV",
1316         .bat_iface_enable = batadv_iv_ogm_iface_enable,
1317         .bat_iface_disable = batadv_iv_ogm_iface_disable,
1318         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1319         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1320         .bat_ogm_schedule = batadv_iv_ogm_schedule,
1321         .bat_ogm_emit = batadv_iv_ogm_emit,
1322 };
1323
1324 int __init batadv_iv_init(void)
1325 {
1326         int ret;
1327
1328         /* batman originator packet */
1329         ret = batadv_recv_handler_register(BATADV_IV_OGM,
1330                                            batadv_iv_ogm_receive);
1331         if (ret < 0)
1332                 goto out;
1333
1334         ret = batadv_algo_register(&batadv_batman_iv);
1335         if (ret < 0)
1336                 goto handler_unregister;
1337
1338         goto out;
1339
1340 handler_unregister:
1341         batadv_recv_handler_unregister(BATADV_IV_OGM);
1342 out:
1343         return ret;
1344 }