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 batadv_neigh_node *
  32 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
  33                         const uint8_t *neigh_addr,
  34                         struct batadv_orig_node *orig_node,
  35                         struct batadv_orig_node *orig_neigh, __be32 seqno)
  36 {
  37         struct batadv_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 batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
  58 {
  59         struct batadv_ogm_packet *batadv_ogm_packet;
  60         unsigned char *ogm_buff;
  61         uint32_t random_seqno;
  62         int res = -ENOMEM;
  63
  64         /* randomize initial seqno to avoid collision */
  65         get_random_bytes(&random_seqno, sizeof(random_seqno));
  66         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
  67
  68         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
  69         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
  70         if (!ogm_buff)
  71                 goto out;
  72
  73         hard_iface->bat_iv.ogm_buff = ogm_buff;
  74
  75         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
  76         batadv_ogm_packet->header.packet_type = BATADV_IV_OGM;
  77         batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION;
  78         batadv_ogm_packet->header.ttl = 2;
  79         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
  80         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
  81         batadv_ogm_packet->tt_num_changes = 0;
  82         batadv_ogm_packet->ttvn = 0;
  83
  84         res = 0;
  85
  86 out:
  87         return res;
  88 }
  89
  90 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
  91 {
  92         kfree(hard_iface->bat_iv.ogm_buff);
  93         hard_iface->bat_iv.ogm_buff = NULL;
  94 }
  95
  96 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
  97 {
  98         struct batadv_ogm_packet *batadv_ogm_packet;
  99         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 100
 101         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 102         memcpy(batadv_ogm_packet->orig,
 103                hard_iface->net_dev->dev_addr, ETH_ALEN);
 104         memcpy(batadv_ogm_packet->prev_sender,
 105                hard_iface->net_dev->dev_addr, ETH_ALEN);
 106 }
 107
 108 static void
 109 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 110 {
 111         struct batadv_ogm_packet *batadv_ogm_packet;
 112         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 113
 114         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 115         batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
 116         batadv_ogm_packet->header.ttl = BATADV_TTL;
 117 }
 118
 119 /* when do we schedule our own ogm to be sent */
 120 static unsigned long
 121 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 122 {
 123         unsigned int msecs;
 124
 125         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 126         msecs += (random32() % 2 * BATADV_JITTER);
 127
 128         return jiffies + msecs_to_jiffies(msecs);
 129 }
 130
 131 /* when do we schedule a ogm packet to be sent */
 132 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 133 {
 134         return jiffies + msecs_to_jiffies(random32() % (BATADV_JITTER / 2));
 135 }
 136
 137 /* apply hop penalty for a normal link */
 138 static uint8_t batadv_hop_penalty(uint8_t tq,
 139                                   const struct batadv_priv *bat_priv)
 140 {
 141         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 142         int new_tq;
 143
 144         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 145         new_tq /= BATADV_TQ_MAX_VALUE;
 146
 147         return new_tq;
 148 }
 149
 150 /* is there another aggregated packet here? */
 151 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 152                                      int tt_num_changes)
 153 {
 154         int next_buff_pos = 0;
 155
 156         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 157         next_buff_pos += batadv_tt_len(tt_num_changes);
 158
 159         return (next_buff_pos <= packet_len) &&
 160                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 161 }
 162
 163 /* send a batman ogm to a given interface */
 164 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 165                                      struct batadv_hard_iface *hard_iface)
 166 {
 167         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 168         char *fwd_str;
 169         uint8_t packet_num;
 170         int16_t buff_pos;
 171         struct batadv_ogm_packet *batadv_ogm_packet;
 172         struct sk_buff *skb;
 173         uint8_t *packet_pos;
 174
 175         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 176                 return;
 177
 178         packet_num = 0;
 179         buff_pos = 0;
 180         packet_pos = forw_packet->skb->data;
 181         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 182
 183         /* adjust all flags and log packets */
 184         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 185                                          batadv_ogm_packet->tt_num_changes)) {
 186
 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
 265                 /* FIXME: what about aggregated packets ? */
 266                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 267                            "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
 268                            (forw_packet->own ? "Sending own" : "Forwarding"),
 269                            batadv_ogm_packet->orig,
 270                            ntohl(batadv_ogm_packet->seqno),
 271                            batadv_ogm_packet->header.ttl,
 272                            forw_packet->if_incoming->net_dev->name,
 273                            forw_packet->if_incoming->net_dev->dev_addr);
 274
 275                 /* skb is only used once and than forw_packet is free'd */
 276                 batadv_send_skb_packet(forw_packet->skb,
 277                                        forw_packet->if_incoming,
 278                                        batadv_broadcast_addr);
 279                 forw_packet->skb = NULL;
 280
 281                 goto out;
 282         }
 283
 284         /* broadcast on every interface */
 285         rcu_read_lock();
 286         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 287                 if (hard_iface->soft_iface != soft_iface)
 288                         continue;
 289
 290                 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
 291         }
 292         rcu_read_unlock();
 293
 294 out:
 295         if (primary_if)
 296                 batadv_hardif_free_ref(primary_if);
 297 }
 298
 299 /* return true if new_packet can be aggregated with forw_packet */
 300 static bool
 301 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 302                             struct batadv_priv *bat_priv,
 303                             int packet_len, unsigned long send_time,
 304                             bool directlink,
 305                             const struct batadv_hard_iface *if_incoming,
 306                             const struct batadv_forw_packet *forw_packet)
 307 {
 308         struct batadv_ogm_packet *batadv_ogm_packet;
 309         int aggregated_bytes = forw_packet->packet_len + packet_len;
 310         struct batadv_hard_iface *primary_if = NULL;
 311         bool res = false;
 312         unsigned long aggregation_end_time;
 313
 314         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 315         aggregation_end_time = send_time;
 316         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 317
 318         /* we can aggregate the current packet to this aggregated packet
 319          * if:
 320          *
 321          * - the send time is within our MAX_AGGREGATION_MS time
 322          * - the resulting packet wont be bigger than
 323          *   MAX_AGGREGATION_BYTES
 324          */
 325         if (time_before(send_time, forw_packet->send_time) &&
 326             time_after_eq(aggregation_end_time, forw_packet->send_time) &&
 327             (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
 328
 329                 /* check aggregation compatibility
 330                  * -> direct link packets are broadcasted on
 331                  *    their interface only
 332                  * -> aggregate packet if the current packet is
 333                  *    a "global" packet as well as the base
 334                  *    packet
 335                  */
 336                 primary_if = batadv_primary_if_get_selected(bat_priv);
 337                 if (!primary_if)
 338                         goto out;
 339
 340                 /* packets without direct link flag and high TTL
 341                  * are flooded through the net
 342                  */
 343                 if ((!directlink) &&
 344                     (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
 345                     (batadv_ogm_packet->header.ttl != 1) &&
 346
 347                     /* own packets originating non-primary
 348                      * interfaces leave only that interface
 349                      */
 350                     ((!forw_packet->own) ||
 351                      (forw_packet->if_incoming == primary_if))) {
 352                         res = true;
 353                         goto out;
 354                 }
 355
 356                 /* if the incoming packet is sent via this one
 357                  * interface only - we still can aggregate
 358                  */
 359                 if ((directlink) &&
 360                     (new_bat_ogm_packet->header.ttl == 1) &&
 361                     (forw_packet->if_incoming == if_incoming) &&
 362
 363                     /* packets from direct neighbors or
 364                      * own secondary interface packets
 365                      * (= secondary interface packets in general)
 366                      */
 367                     (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 368                      (forw_packet->own &&
 369                       forw_packet->if_incoming != primary_if))) {
 370                         res = true;
 371                         goto out;
 372                 }
 373         }
 374
 375 out:
 376         if (primary_if)
 377                 batadv_hardif_free_ref(primary_if);
 378         return res;
 379 }
 380
 381 /* create a new aggregated packet and add this packet to it */
 382 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 383                                         int packet_len, unsigned long send_time,
 384                                         bool direct_link,
 385                                         struct batadv_hard_iface *if_incoming,
 386                                         int own_packet)
 387 {
 388         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 389         struct batadv_forw_packet *forw_packet_aggr;
 390         unsigned char *skb_buff;
 391         unsigned int skb_size;
 392
 393         if (!atomic_inc_not_zero(&if_incoming->refcount))
 394                 return;
 395
 396         /* own packet should always be scheduled */
 397         if (!own_packet) {
 398                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 399                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 400                                    "batman packet queue full\n");
 401                         goto out;
 402                 }
 403         }
 404
 405         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 406         if (!forw_packet_aggr) {
 407                 if (!own_packet)
 408                         atomic_inc(&bat_priv->batman_queue_left);
 409                 goto out;
 410         }
 411
 412         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 413             (packet_len < BATADV_MAX_AGGREGATION_BYTES))
 414                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 415         else
 416                 skb_size = packet_len;
 417
 418         skb_size += ETH_HLEN + NET_IP_ALIGN;
 419
 420         forw_packet_aggr->skb = dev_alloc_skb(skb_size);
 421         if (!forw_packet_aggr->skb) {
 422                 if (!own_packet)
 423                         atomic_inc(&bat_priv->batman_queue_left);
 424                 kfree(forw_packet_aggr);
 425                 goto out;
 426         }
 427         skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN);
 428
 429         INIT_HLIST_NODE(&forw_packet_aggr->list);
 430
 431         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 432         forw_packet_aggr->packet_len = packet_len;
 433         memcpy(skb_buff, packet_buff, packet_len);
 434
 435         forw_packet_aggr->own = own_packet;
 436         forw_packet_aggr->if_incoming = if_incoming;
 437         forw_packet_aggr->num_packets = 0;
 438         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 439         forw_packet_aggr->send_time = send_time;
 440
 441         /* save packet direct link flag status */
 442         if (direct_link)
 443                 forw_packet_aggr->direct_link_flags |= 1;
 444
 445         /* add new packet to packet list */
 446         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 447         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 448         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 449
 450         /* start timer for this packet */
 451         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 452                           batadv_send_outstanding_bat_ogm_packet);
 453         queue_delayed_work(batadv_event_workqueue,
 454                            &forw_packet_aggr->delayed_work,
 455                            send_time - jiffies);
 456
 457         return;
 458 out:
 459         batadv_hardif_free_ref(if_incoming);
 460 }
 461
 462 /* aggregate a new packet into the existing ogm packet */
 463 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 464                                     const unsigned char *packet_buff,
 465                                     int packet_len, bool direct_link)
 466 {
 467         unsigned char *skb_buff;
 468         unsigned long new_direct_link_flag;
 469
 470         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 471         memcpy(skb_buff, packet_buff, packet_len);
 472         forw_packet_aggr->packet_len += packet_len;
 473         forw_packet_aggr->num_packets++;
 474
 475         /* save packet direct link flag status */
 476         if (direct_link) {
 477                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 478                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 479         }
 480 }
 481
 482 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 483                                     unsigned char *packet_buff,
 484                                     int packet_len,
 485                                     struct batadv_hard_iface *if_incoming,
 486                                     int own_packet, unsigned long send_time)
 487 {
 488         /* _aggr -> pointer to the packet we want to aggregate with
 489          * _pos -> pointer to the position in the queue
 490          */
 491         struct batadv_forw_packet *forw_packet_aggr = NULL;
 492         struct batadv_forw_packet *forw_packet_pos = NULL;
 493         struct hlist_node *tmp_node;
 494         struct batadv_ogm_packet *batadv_ogm_packet;
 495         bool direct_link;
 496         unsigned long max_aggregation_jiffies;
 497
 498         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 499         direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
 500         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 501
 502         /* find position for the packet in the forward queue */
 503         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 504         /* own packets are not to be aggregated */
 505         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 506                 hlist_for_each_entry(forw_packet_pos, tmp_node,
 507                                      &bat_priv->forw_bat_list, list) {
 508                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 509                                                         bat_priv, packet_len,
 510                                                         send_time, direct_link,
 511                                                         if_incoming,
 512                                                         forw_packet_pos)) {
 513                                 forw_packet_aggr = forw_packet_pos;
 514                                 break;
 515                         }
 516                 }
 517         }
 518
 519         /* nothing to aggregate with - either aggregation disabled or no
 520          * suitable aggregation packet found
 521          */
 522         if (!forw_packet_aggr) {
 523                 /* the following section can run without the lock */
 524                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 525
 526                 /* if we could not aggregate this packet with one of the others
 527                  * we hold it back for a while, so that it might be aggregated
 528                  * later on
 529                  */
 530                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 531                         send_time += max_aggregation_jiffies;
 532
 533                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 534                                             send_time, direct_link,
 535                                             if_incoming, own_packet);
 536         } else {
 537                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 538                                         packet_len, direct_link);
 539                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 540         }
 541 }
 542
 543 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 544                                   const struct ethhdr *ethhdr,
 545                                   struct batadv_ogm_packet *batadv_ogm_packet,
 546                                   bool is_single_hop_neigh,
 547                                   bool is_from_best_next_hop,
 548                                   struct batadv_hard_iface *if_incoming)
 549 {
 550         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 551         uint8_t tt_num_changes;
 552
 553         if (batadv_ogm_packet->header.ttl <= 1) {
 554                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 555                 return;
 556         }
 557
 558         if (!is_from_best_next_hop) {
 559                 /* Mark the forwarded packet when it is not coming from our
 560                  * best next hop. We still need to forward the packet for our
 561                  * neighbor link quality detection to work in case the packet
 562                  * originated from a single hop neighbor. Otherwise we can
 563                  * simply drop the ogm.
 564                  */
 565                 if (is_single_hop_neigh)
 566                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 567                 else
 568                         return;
 569         }
 570
 571         tt_num_changes = batadv_ogm_packet->tt_num_changes;
 572
 573         batadv_ogm_packet->header.ttl--;
 574         memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 575
 576         /* apply hop penalty */
 577         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 578                                                    bat_priv);
 579
 580         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 581                    "Forwarding packet: tq: %i, ttl: %i\n",
 582                    batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
 583
 584         /* switch of primaries first hop flag when forwarding */
 585         batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
 586         if (is_single_hop_neigh)
 587                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 588         else
 589                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 590
 591         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 592                                 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
 593                                 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
 594 }
 595
 596 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 597 {
 598         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 599         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 600         struct batadv_ogm_packet *batadv_ogm_packet;
 601         struct batadv_hard_iface *primary_if;
 602         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 603         int vis_server, tt_num_changes = 0;
 604         uint32_t seqno;
 605         uint8_t bandwidth;
 606
 607         vis_server = atomic_read(&bat_priv->vis_mode);
 608         primary_if = batadv_primary_if_get_selected(bat_priv);
 609
 610         if (hard_iface == primary_if)
 611                 tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff,
 612                                                        ogm_buff_len,
 613                                                        BATADV_OGM_HLEN);
 614
 615         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 616
 617         /* change sequence number to network order */
 618         seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 619         batadv_ogm_packet->seqno = htonl(seqno);
 620         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 621
 622         batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
 623         batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
 624         if (tt_num_changes >= 0)
 625                 batadv_ogm_packet->tt_num_changes = tt_num_changes;
 626
 627         if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
 628                 batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
 629         else
 630                 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
 631
 632         if (hard_iface == primary_if &&
 633             atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) {
 634                 bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 635                 batadv_ogm_packet->gw_flags = bandwidth;
 636         } else {
 637                 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
 638         }
 639
 640         batadv_slide_own_bcast_window(hard_iface);
 641         batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
 642                                 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
 643                                 batadv_iv_ogm_emit_send_time(bat_priv));
 644
 645         if (primary_if)
 646                 batadv_hardif_free_ref(primary_if);
 647 }
 648
 649 static void
 650 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 651                           struct batadv_orig_node *orig_node,
 652                           const struct ethhdr *ethhdr,
 653                           const struct batadv_ogm_packet *batadv_ogm_packet,
 654                           struct batadv_hard_iface *if_incoming,
 655                           const unsigned char *tt_buff,
 656                           int is_duplicate)
 657 {
 658         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 659         struct batadv_neigh_node *router = NULL;
 660         struct batadv_orig_node *orig_node_tmp;
 661         struct hlist_node *node;
 662         int if_num;
 663         uint8_t sum_orig, sum_neigh;
 664         uint8_t *neigh_addr;
 665         uint8_t tq_avg;
 666
 667         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 668                    "update_originator(): Searching and updating originator entry of received packet\n");
 669
 670         rcu_read_lock();
 671         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 672                                  &orig_node->neigh_list, list) {
 673                 neigh_addr = tmp_neigh_node->addr;
 674                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 675                     tmp_neigh_node->if_incoming == if_incoming &&
 676                     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 677                         if (neigh_node)
 678                                 batadv_neigh_node_free_ref(neigh_node);
 679                         neigh_node = tmp_neigh_node;
 680                         continue;
 681                 }
 682
 683                 if (is_duplicate)
 684                         continue;
 685
 686                 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
 687                 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
 688                                        &tmp_neigh_node->tq_index, 0);
 689                 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
 690                 tmp_neigh_node->tq_avg = tq_avg;
 691                 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
 692         }
 693
 694         if (!neigh_node) {
 695                 struct batadv_orig_node *orig_tmp;
 696
 697                 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
 698                 if (!orig_tmp)
 699                         goto unlock;
 700
 701                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
 702                                                      ethhdr->h_source,
 703                                                      orig_node, orig_tmp,
 704                                                      batadv_ogm_packet->seqno);
 705
 706                 batadv_orig_node_free_ref(orig_tmp);
 707                 if (!neigh_node)
 708                         goto unlock;
 709         } else
 710                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 711                            "Updating existing last-hop neighbor of originator\n");
 712
 713         rcu_read_unlock();
 714
 715         orig_node->flags = batadv_ogm_packet->flags;
 716         neigh_node->last_seen = jiffies;
 717
 718         spin_lock_bh(&neigh_node->lq_update_lock);
 719         batadv_ring_buffer_set(neigh_node->tq_recv,
 720                                &neigh_node->tq_index,
 721                                batadv_ogm_packet->tq);
 722         neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
 723         spin_unlock_bh(&neigh_node->lq_update_lock);
 724
 725         if (!is_duplicate) {
 726                 orig_node->last_ttl = batadv_ogm_packet->header.ttl;
 727                 neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
 728         }
 729
 730         batadv_bonding_candidate_add(orig_node, neigh_node);
 731
 732         /* if this neighbor already is our next hop there is nothing
 733          * to change
 734          */
 735         router = batadv_orig_node_get_router(orig_node);
 736         if (router == neigh_node)
 737                 goto update_tt;
 738
 739         /* if this neighbor does not offer a better TQ we won't consider it */
 740         if (router && (router->tq_avg > neigh_node->tq_avg))
 741                 goto update_tt;
 742
 743         /* if the TQ is the same and the link not more symmetric we
 744          * won't consider it either
 745          */
 746         if (router && (neigh_node->tq_avg == router->tq_avg)) {
 747                 orig_node_tmp = router->orig_node;
 748                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 749                 if_num = router->if_incoming->if_num;
 750                 sum_orig = orig_node_tmp->bcast_own_sum[if_num];
 751                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 752
 753                 orig_node_tmp = neigh_node->orig_node;
 754                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 755                 if_num = neigh_node->if_incoming->if_num;
 756                 sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
 757                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 758
 759                 if (sum_orig >= sum_neigh)
 760                         goto update_tt;
 761         }
 762
 763         batadv_update_route(bat_priv, orig_node, neigh_node);
 764
 765 update_tt:
 766         /* I have to check for transtable changes only if the OGM has been
 767          * sent through a primary interface
 768          */
 769         if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
 770              (batadv_ogm_packet->header.ttl > 2)) ||
 771             (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
 772                 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
 773                                       batadv_ogm_packet->tt_num_changes,
 774                                       batadv_ogm_packet->ttvn,
 775                                       ntohs(batadv_ogm_packet->tt_crc));
 776
 777         if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
 778                 batadv_gw_node_update(bat_priv, orig_node,
 779                                       batadv_ogm_packet->gw_flags);
 780
 781         orig_node->gw_flags = batadv_ogm_packet->gw_flags;
 782
 783         /* restart gateway selection if fast or late switching was enabled */
 784         if ((orig_node->gw_flags) &&
 785             (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
 786             (atomic_read(&bat_priv->gw_sel_class) > 2))
 787                 batadv_gw_check_election(bat_priv, orig_node);
 788
 789         goto out;
 790
 791 unlock:
 792         rcu_read_unlock();
 793 out:
 794         if (neigh_node)
 795                 batadv_neigh_node_free_ref(neigh_node);
 796         if (router)
 797                 batadv_neigh_node_free_ref(router);
 798 }
 799
 800 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
 801                                  struct batadv_orig_node *orig_neigh_node,
 802                                  struct batadv_ogm_packet *batadv_ogm_packet,
 803                                  struct batadv_hard_iface *if_incoming)
 804 {
 805         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 806         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
 807         struct hlist_node *node;
 808         uint8_t total_count;
 809         uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
 810         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
 811         int tq_asym_penalty, inv_asym_penalty, ret = 0;
 812         unsigned int combined_tq;
 813
 814         /* find corresponding one hop neighbor */
 815         rcu_read_lock();
 816         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 817                                  &orig_neigh_node->neigh_list, list) {
 818
 819                 if (!batadv_compare_eth(tmp_neigh_node->addr,
 820                                         orig_neigh_node->orig))
 821                         continue;
 822
 823                 if (tmp_neigh_node->if_incoming != if_incoming)
 824                         continue;
 825
 826                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 827                         continue;
 828
 829                 neigh_node = tmp_neigh_node;
 830                 break;
 831         }
 832         rcu_read_unlock();
 833
 834         if (!neigh_node)
 835                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
 836                                                      orig_neigh_node->orig,
 837                                                      orig_neigh_node,
 838                                                      orig_neigh_node,
 839                                                      batadv_ogm_packet->seqno);
 840
 841         if (!neigh_node)
 842                 goto out;
 843
 844         /* if orig_node is direct neighbor update neigh_node last_seen */
 845         if (orig_node == orig_neigh_node)
 846                 neigh_node->last_seen = jiffies;
 847
 848         orig_node->last_seen = jiffies;
 849
 850         /* find packet count of corresponding one hop neighbor */
 851         spin_lock_bh(&orig_node->ogm_cnt_lock);
 852         orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
 853         neigh_rq_count = neigh_node->real_packet_count;
 854         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 855
 856         /* pay attention to not get a value bigger than 100 % */
 857         if (orig_eq_count > neigh_rq_count)
 858                 total_count = neigh_rq_count;
 859         else
 860                 total_count = orig_eq_count;
 861
 862         /* if we have too few packets (too less data) we set tq_own to zero
 863          * if we receive too few packets it is not considered bidirectional
 864          */
 865         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
 866             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
 867                 tq_own = 0;
 868         else
 869                 /* neigh_node->real_packet_count is never zero as we
 870                  * only purge old information when getting new
 871                  * information
 872                  */
 873                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
 874
 875         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 876          * affect the nearly-symmetric links only a little, but
 877          * punishes asymmetric links more.  This will give a value
 878          * between 0 and TQ_MAX_VALUE
 879          */
 880         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
 881         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
 882         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
 883                             BATADV_TQ_LOCAL_WINDOW_SIZE *
 884                             BATADV_TQ_LOCAL_WINDOW_SIZE;
 885         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
 886         inv_asym_penalty /= neigh_rq_max_cube;
 887         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
 888
 889         combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
 890         combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
 891         batadv_ogm_packet->tq = combined_tq;
 892
 893         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 894                    "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
 895                    orig_node->orig, orig_neigh_node->orig, total_count,
 896                    neigh_rq_count, tq_own,
 897                    tq_asym_penalty, batadv_ogm_packet->tq);
 898
 899         /* if link has the minimum required transmission quality
 900          * consider it bidirectional
 901          */
 902         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
 903                 ret = 1;
 904
 905 out:
 906         if (neigh_node)
 907                 batadv_neigh_node_free_ref(neigh_node);
 908         return ret;
 909 }
 910
 911 /* processes a batman packet for all interfaces, adjusts the sequence number and
 912  * finds out whether it is a duplicate.
 913  * returns:
 914  *   1 the packet is a duplicate
 915  *   0 the packet has not yet been received
 916  *  -1 the packet is old and has been received while the seqno window
 917  *     was protected. Caller should drop it.
 918  */
 919 static int
 920 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
 921                             const struct batadv_ogm_packet *batadv_ogm_packet,
 922                             const struct batadv_hard_iface *if_incoming)
 923 {
 924         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 925         struct batadv_orig_node *orig_node;
 926         struct batadv_neigh_node *tmp_neigh_node;
 927         struct hlist_node *node;
 928         int is_duplicate = 0;
 929         int32_t seq_diff;
 930         int need_update = 0;
 931         int set_mark, ret = -1;
 932         uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
 933         uint8_t *neigh_addr;
 934         uint8_t packet_count;
 935
 936         orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
 937         if (!orig_node)
 938                 return 0;
 939
 940         spin_lock_bh(&orig_node->ogm_cnt_lock);
 941         seq_diff = seqno - orig_node->last_real_seqno;
 942
 943         /* signalize caller that the packet is to be dropped. */
 944         if (!hlist_empty(&orig_node->neigh_list) &&
 945             batadv_window_protected(bat_priv, seq_diff,
 946                                     &orig_node->batman_seqno_reset))
 947                 goto out;
 948
 949         rcu_read_lock();
 950         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 951                                  &orig_node->neigh_list, list) {
 952
 953                 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
 954                                                 orig_node->last_real_seqno,
 955                                                 seqno);
 956
 957                 neigh_addr = tmp_neigh_node->addr;
 958                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 959                     tmp_neigh_node->if_incoming == if_incoming)
 960                         set_mark = 1;
 961                 else
 962                         set_mark = 0;
 963
 964                 /* if the window moved, set the update flag. */
 965                 need_update |= batadv_bit_get_packet(bat_priv,
 966                                                      tmp_neigh_node->real_bits,
 967                                                      seq_diff, set_mark);
 968
 969                 packet_count = bitmap_weight(tmp_neigh_node->real_bits,
 970                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
 971                 tmp_neigh_node->real_packet_count = packet_count;
 972         }
 973         rcu_read_unlock();
 974
 975         if (need_update) {
 976                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 977                            "updating last_seqno: old %u, new %u\n",
 978                            orig_node->last_real_seqno, seqno);
 979                 orig_node->last_real_seqno = seqno;
 980         }
 981
 982         ret = is_duplicate;
 983
 984 out:
 985         spin_unlock_bh(&orig_node->ogm_cnt_lock);
 986         batadv_orig_node_free_ref(orig_node);
 987         return ret;
 988 }
 989
 990 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
 991                                   struct batadv_ogm_packet *batadv_ogm_packet,
 992                                   const unsigned char *tt_buff,
 993                                   struct batadv_hard_iface *if_incoming)
 994 {
 995         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 996         struct batadv_hard_iface *hard_iface;
 997         struct batadv_orig_node *orig_neigh_node, *orig_node;
 998         struct batadv_neigh_node *router = NULL, *router_router = NULL;
 999         struct batadv_neigh_node *orig_neigh_router = NULL;
1000         int has_directlink_flag;
1001         int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
1002         int is_broadcast = 0, is_bidirect;
1003         bool is_single_hop_neigh = false;
1004         bool is_from_best_next_hop = false;
1005         int is_duplicate, sameseq, simlar_ttl;
1006         uint32_t if_incoming_seqno;
1007         uint8_t *prev_sender;
1008
1009         /* Silently drop when the batman packet is actually not a
1010          * correct packet.
1011          *
1012          * This might happen if a packet is padded (e.g. Ethernet has a
1013          * minimum frame length of 64 byte) and the aggregation interprets
1014          * it as an additional length.
1015          *
1016          * TODO: A more sane solution would be to have a bit in the
1017          * batadv_ogm_packet to detect whether the packet is the last
1018          * packet in an aggregation.  Here we expect that the padding
1019          * is always zero (or not 0x01)
1020          */
1021         if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
1022                 return;
1023
1024         /* could be changed by schedule_own_packet() */
1025         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1026
1027         if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1028                 has_directlink_flag = 1;
1029         else
1030                 has_directlink_flag = 0;
1031
1032         if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1033                 is_single_hop_neigh = true;
1034
1035         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1036                    "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",
1037                    ethhdr->h_source, if_incoming->net_dev->name,
1038                    if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1039                    batadv_ogm_packet->prev_sender,
1040                    ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1041                    ntohs(batadv_ogm_packet->tt_crc),
1042                    batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1043                    batadv_ogm_packet->header.ttl,
1044                    batadv_ogm_packet->header.version, has_directlink_flag);
1045
1046         rcu_read_lock();
1047         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1048                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1049                         continue;
1050
1051                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1052                         continue;
1053
1054                 if (batadv_compare_eth(ethhdr->h_source,
1055                                        hard_iface->net_dev->dev_addr))
1056                         is_my_addr = 1;
1057
1058                 if (batadv_compare_eth(batadv_ogm_packet->orig,
1059                                        hard_iface->net_dev->dev_addr))
1060                         is_my_orig = 1;
1061
1062                 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1063                                        hard_iface->net_dev->dev_addr))
1064                         is_my_oldorig = 1;
1065
1066                 if (is_broadcast_ether_addr(ethhdr->h_source))
1067                         is_broadcast = 1;
1068         }
1069         rcu_read_unlock();
1070
1071         if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
1072                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1073                            "Drop packet: incompatible batman version (%i)\n",
1074                            batadv_ogm_packet->header.version);
1075                 return;
1076         }
1077
1078         if (is_my_addr) {
1079                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1080                            "Drop packet: received my own broadcast (sender: %pM)\n",
1081                            ethhdr->h_source);
1082                 return;
1083         }
1084
1085         if (is_broadcast) {
1086                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1087                            "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1088                            ethhdr->h_source);
1089                 return;
1090         }
1091
1092         if (is_my_orig) {
1093                 unsigned long *word;
1094                 int offset;
1095                 int32_t bit_pos;
1096                 int16_t if_num;
1097                 uint8_t *weight;
1098
1099                 orig_neigh_node = batadv_get_orig_node(bat_priv,
1100                                                        ethhdr->h_source);
1101                 if (!orig_neigh_node)
1102                         return;
1103
1104                 /* neighbor has to indicate direct link and it has to
1105                  * come via the corresponding interface
1106                  * save packet seqno for bidirectional check
1107                  */
1108                 if (has_directlink_flag &&
1109                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1110                                        batadv_ogm_packet->orig)) {
1111                         if_num = if_incoming->if_num;
1112                         offset = if_num * BATADV_NUM_WORDS;
1113
1114                         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1115                         word = &(orig_neigh_node->bcast_own[offset]);
1116                         bit_pos = if_incoming_seqno - 2;
1117                         bit_pos -= ntohl(batadv_ogm_packet->seqno);
1118                         batadv_set_bit(word, bit_pos);
1119                         weight = &orig_neigh_node->bcast_own_sum[if_num];
1120                         *weight = bitmap_weight(word,
1121                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1122                         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1123                 }
1124
1125                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1126                            "Drop packet: originator packet from myself (via neighbor)\n");
1127                 batadv_orig_node_free_ref(orig_neigh_node);
1128                 return;
1129         }
1130
1131         if (is_my_oldorig) {
1132                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1133                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1134                            ethhdr->h_source);
1135                 return;
1136         }
1137
1138         if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1139                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1140                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1141                            ethhdr->h_source);
1142                 return;
1143         }
1144
1145         orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1146         if (!orig_node)
1147                 return;
1148
1149         is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1150                                                    if_incoming);
1151
1152         if (is_duplicate == -1) {
1153                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1154                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1155                            ethhdr->h_source);
1156                 goto out;
1157         }
1158
1159         if (batadv_ogm_packet->tq == 0) {
1160                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1161                            "Drop packet: originator packet with tq equal 0\n");
1162                 goto out;
1163         }
1164
1165         router = batadv_orig_node_get_router(orig_node);
1166         if (router)
1167                 router_router = batadv_orig_node_get_router(router->orig_node);
1168
1169         if ((router && router->tq_avg != 0) &&
1170             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1171                 is_from_best_next_hop = true;
1172
1173         prev_sender = batadv_ogm_packet->prev_sender;
1174         /* avoid temporary routing loops */
1175         if (router && router_router &&
1176             (batadv_compare_eth(router->addr, prev_sender)) &&
1177             !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1178             (batadv_compare_eth(router->addr, router_router->addr))) {
1179                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1180                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1181                            ethhdr->h_source);
1182                 goto out;
1183         }
1184
1185         /* if sender is a direct neighbor the sender mac equals
1186          * originator mac
1187          */
1188         if (is_single_hop_neigh)
1189                 orig_neigh_node = orig_node;
1190         else
1191                 orig_neigh_node = batadv_get_orig_node(bat_priv,
1192                                                        ethhdr->h_source);
1193
1194         if (!orig_neigh_node)
1195                 goto out;
1196
1197         orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1198
1199         /* drop packet if sender is not a direct neighbor and if we
1200          * don't route towards it
1201          */
1202         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1203                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1204                            "Drop packet: OGM via unknown neighbor!\n");
1205                 goto out_neigh;
1206         }
1207
1208         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1209                                             batadv_ogm_packet, if_incoming);
1210
1211         batadv_bonding_save_primary(orig_node, orig_neigh_node,
1212                                     batadv_ogm_packet);
1213
1214         /* update ranking if it is not a duplicate or has the same
1215          * seqno and similar ttl as the non-duplicate
1216          */
1217         sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1218         simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
1219         if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
1220                 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1221                                           batadv_ogm_packet, if_incoming,
1222                                           tt_buff, is_duplicate);
1223
1224         /* is single hop (direct) neighbor */
1225         if (is_single_hop_neigh) {
1226
1227                 /* mark direct link on incoming interface */
1228                 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1229                                       is_single_hop_neigh,
1230                                       is_from_best_next_hop, if_incoming);
1231
1232                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1233                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1234                 goto out_neigh;
1235         }
1236
1237         /* multihop originator */
1238         if (!is_bidirect) {
1239                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1240                            "Drop packet: not received via bidirectional link\n");
1241                 goto out_neigh;
1242         }
1243
1244         if (is_duplicate) {
1245                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1246                            "Drop packet: duplicate packet received\n");
1247                 goto out_neigh;
1248         }
1249
1250         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1251                    "Forwarding packet: rebroadcast originator packet\n");
1252         batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1253                               is_single_hop_neigh, is_from_best_next_hop,
1254                               if_incoming);
1255
1256 out_neigh:
1257         if ((orig_neigh_node) && (!is_single_hop_neigh))
1258                 batadv_orig_node_free_ref(orig_neigh_node);
1259 out:
1260         if (router)
1261                 batadv_neigh_node_free_ref(router);
1262         if (router_router)
1263                 batadv_neigh_node_free_ref(router_router);
1264         if (orig_neigh_router)
1265                 batadv_neigh_node_free_ref(orig_neigh_router);
1266
1267         batadv_orig_node_free_ref(orig_node);
1268 }
1269
1270 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1271                                  struct batadv_hard_iface *if_incoming)
1272 {
1273         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1274         struct batadv_ogm_packet *batadv_ogm_packet;
1275         struct ethhdr *ethhdr;
1276         int buff_pos = 0, packet_len;
1277         unsigned char *tt_buff, *packet_buff;
1278         bool ret;
1279         uint8_t *packet_pos;
1280
1281         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1282         if (!ret)
1283                 return NET_RX_DROP;
1284
1285         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1286          * that does not have B.A.T.M.A.N. IV enabled ?
1287          */
1288         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1289                 return NET_RX_DROP;
1290
1291         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1292         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1293                            skb->len + ETH_HLEN);
1294
1295         packet_len = skb_headlen(skb);
1296         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1297         packet_buff = skb->data;
1298         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1299
1300         /* unpack the aggregated packets and process them one by one */
1301         do {
1302                 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1303
1304                 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
1305                                       if_incoming);
1306
1307                 buff_pos += BATADV_OGM_HLEN;
1308                 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
1309
1310                 packet_pos = packet_buff + buff_pos;
1311                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1312         } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1313                                            batadv_ogm_packet->tt_num_changes));
1314
1315         kfree_skb(skb);
1316         return NET_RX_SUCCESS;
1317 }
1318
1319 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1320         .name = "BATMAN_IV",
1321         .bat_iface_enable = batadv_iv_ogm_iface_enable,
1322         .bat_iface_disable = batadv_iv_ogm_iface_disable,
1323         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1324         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1325         .bat_ogm_schedule = batadv_iv_ogm_schedule,
1326         .bat_ogm_emit = batadv_iv_ogm_emit,
1327 };
1328
1329 int __init batadv_iv_init(void)
1330 {
1331         int ret;
1332
1333         /* batman originator packet */
1334         ret = batadv_recv_handler_register(BATADV_IV_OGM,
1335                                            batadv_iv_ogm_receive);
1336         if (ret < 0)
1337                 goto out;
1338
1339         ret = batadv_algo_register(&batadv_batman_iv);
1340         if (ret < 0)
1341                 goto handler_unregister;
1342
1343         goto out;
1344
1345 handler_unregister:
1346         batadv_recv_handler_unregister(BATADV_IV_OGM);
1347 out:
1348         return ret;
1349 }