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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "main.h"
  19 #include "translation-table.h"
  20 #include "originator.h"
  21 #include "routing.h"
  22 #include "gateway_common.h"
  23 #include "gateway_client.h"
  24 #include "hard-interface.h"
  25 #include "send.h"
  26 #include "bat_algo.h"
  27 #include "network-coding.h"
  28
  29
  30 /**
  31  * batadv_dup_status - duplicate status
  32  * @BATADV_NO_DUP: the packet is a duplicate
  33  * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
  34  *  neighbor)
  35  * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
  36  * @BATADV_PROTECTED: originator is currently protected (after reboot)
  37  */
  38 enum batadv_dup_status {
  39         BATADV_NO_DUP = 0,
  40         BATADV_ORIG_DUP,
  41         BATADV_NEIGH_DUP,
  42         BATADV_PROTECTED,
  43 };
  44
  45 /**
  46  * batadv_ring_buffer_set - update the ring buffer with the given value
  47  * @lq_recv: pointer to the ring buffer
  48  * @lq_index: index to store the value at
  49  * @value: value to store in the ring buffer
  50  */
  51 static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index,
  52                                    uint8_t value)
  53 {
  54         lq_recv[*lq_index] = value;
  55         *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
  56 }
  57
  58 /**
  59  * batadv_ring_buffer_set - compute the average of all non-zero values stored
  60  * in the given ring buffer
  61  * @lq_recv: pointer to the ring buffer
  62  *
  63  * Returns computed average value.
  64  */
  65 static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[])
  66 {
  67         const uint8_t *ptr;
  68         uint16_t count = 0, i = 0, sum = 0;
  69
  70         ptr = lq_recv;
  71
  72         while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
  73                 if (*ptr != 0) {
  74                         count++;
  75                         sum += *ptr;
  76                 }
  77
  78                 i++;
  79                 ptr++;
  80         }
  81
  82         if (count == 0)
  83                 return 0;
  84
  85         return (uint8_t)(sum / count);
  86 }
  87
  88 /**
  89  * batadv_iv_ogm_orig_free - free the private resources allocated for this
  90  *  orig_node
  91  * @orig_node: the orig_node for which the resources have to be free'd
  92  */
  93 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
  94 {
  95         kfree(orig_node->bat_iv.bcast_own);
  96         kfree(orig_node->bat_iv.bcast_own_sum);
  97 }
  98
  99 /**
 100  * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
 101  *  include the new hard-interface
 102  * @orig_node: the orig_node that has to be changed
 103  * @max_if_num: the current amount of interfaces
 104  *
 105  * Returns 0 on success, a negative error code otherwise.
 106  */
 107 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
 108                                      int max_if_num)
 109 {
 110         void *data_ptr;
 111         size_t data_size, old_size;
 112         int ret = -ENOMEM;
 113
 114         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 115
 116         data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS;
 117         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 118         data_ptr = kmalloc(data_size, GFP_ATOMIC);
 119         if (!data_ptr)
 120                 goto unlock;
 121
 122         memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
 123         kfree(orig_node->bat_iv.bcast_own);
 124         orig_node->bat_iv.bcast_own = data_ptr;
 125
 126         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 127         if (!data_ptr) {
 128                 kfree(orig_node->bat_iv.bcast_own);
 129                 goto unlock;
 130         }
 131
 132         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 133                (max_if_num - 1) * sizeof(uint8_t));
 134         kfree(orig_node->bat_iv.bcast_own_sum);
 135         orig_node->bat_iv.bcast_own_sum = data_ptr;
 136
 137         ret = 0;
 138
 139 unlock:
 140         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 141
 142         return ret;
 143 }
 144
 145 /**
 146  * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
 147  *  exclude the removed interface
 148  * @orig_node: the orig_node that has to be changed
 149  * @max_if_num: the current amount of interfaces
 150  * @del_if_num: the index of the interface being removed
 151  *
 152  * Returns 0 on success, a negative error code otherwise.
 153  */
 154 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
 155                                      int max_if_num, int del_if_num)
 156 {
 157         int chunk_size,  ret = -ENOMEM, if_offset;
 158         void *data_ptr = NULL;
 159
 160         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 161
 162         /* last interface was removed */
 163         if (max_if_num == 0)
 164                 goto free_bcast_own;
 165
 166         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 167         data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
 168         if (!data_ptr)
 169                 goto unlock;
 170
 171         /* copy first part */
 172         memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
 173
 174         /* copy second part */
 175         memcpy((char *)data_ptr + del_if_num * chunk_size,
 176                orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size),
 177                (max_if_num - del_if_num) * chunk_size);
 178
 179 free_bcast_own:
 180         kfree(orig_node->bat_iv.bcast_own);
 181         orig_node->bat_iv.bcast_own = data_ptr;
 182
 183         if (max_if_num == 0)
 184                 goto free_own_sum;
 185
 186         data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
 187         if (!data_ptr) {
 188                 kfree(orig_node->bat_iv.bcast_own);
 189                 goto unlock;
 190         }
 191
 192         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 193                del_if_num * sizeof(uint8_t));
 194
 195         if_offset = (del_if_num + 1) * sizeof(uint8_t);
 196         memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
 197                orig_node->bat_iv.bcast_own_sum + if_offset,
 198                (max_if_num - del_if_num) * sizeof(uint8_t));
 199
 200 free_own_sum:
 201         kfree(orig_node->bat_iv.bcast_own_sum);
 202         orig_node->bat_iv.bcast_own_sum = data_ptr;
 203
 204         ret = 0;
 205 unlock:
 206         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 207
 208         return ret;
 209 }
 210
 211 /**
 212  * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
 213  * @bat_priv: the bat priv with all the soft interface information
 214  * @addr: mac address of the originator
 215  *
 216  * Returns the originator object corresponding to the passed mac address or NULL
 217  * on failure.
 218  * If the object does not exists it is created an initialised.
 219  */
 220 static struct batadv_orig_node *
 221 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr)
 222 {
 223         struct batadv_orig_node *orig_node;
 224         int size, hash_added;
 225
 226         orig_node = batadv_orig_hash_find(bat_priv, addr);
 227         if (orig_node)
 228                 return orig_node;
 229
 230         orig_node = batadv_orig_node_new(bat_priv, addr);
 231         if (!orig_node)
 232                 return NULL;
 233
 234         spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
 235
 236         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 237         orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
 238         if (!orig_node->bat_iv.bcast_own)
 239                 goto free_orig_node;
 240
 241         size = bat_priv->num_ifaces * sizeof(uint8_t);
 242         orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 243         if (!orig_node->bat_iv.bcast_own_sum)
 244                 goto free_bcast_own;
 245
 246         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 247                                      batadv_choose_orig, orig_node,
 248                                      &orig_node->hash_entry);
 249         if (hash_added != 0)
 250                 goto free_bcast_own;
 251
 252         return orig_node;
 253
 254 free_bcast_own:
 255         kfree(orig_node->bat_iv.bcast_own);
 256 free_orig_node:
 257         batadv_orig_node_free_ref(orig_node);
 258
 259         return NULL;
 260 }
 261
 262 static struct batadv_neigh_node *
 263 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
 264                         const uint8_t *neigh_addr,
 265                         struct batadv_orig_node *orig_node,
 266                         struct batadv_orig_node *orig_neigh)
 267 {
 268         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 269         struct batadv_neigh_node *neigh_node;
 270
 271         neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node);
 272         if (!neigh_node)
 273                 goto out;
 274
 275         spin_lock_init(&neigh_node->bat_iv.lq_update_lock);
 276
 277         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 278                    "Creating new neighbor %pM for orig_node %pM on interface %s\n",
 279                    neigh_addr, orig_node->orig, hard_iface->net_dev->name);
 280
 281         spin_lock_bh(&orig_node->neigh_list_lock);
 282         hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
 283         spin_unlock_bh(&orig_node->neigh_list_lock);
 284
 285 out:
 286         return neigh_node;
 287 }
 288
 289 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
 290 {
 291         struct batadv_ogm_packet *batadv_ogm_packet;
 292         unsigned char *ogm_buff;
 293         uint32_t random_seqno;
 294         int res = -ENOMEM;
 295
 296         /* randomize initial seqno to avoid collision */
 297         get_random_bytes(&random_seqno, sizeof(random_seqno));
 298         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 299
 300         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 301         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 302         if (!ogm_buff)
 303                 goto out;
 304
 305         hard_iface->bat_iv.ogm_buff = ogm_buff;
 306
 307         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 308         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 309         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 310         batadv_ogm_packet->ttl = 2;
 311         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 312         batadv_ogm_packet->reserved = 0;
 313         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 314
 315         res = 0;
 316
 317 out:
 318         return res;
 319 }
 320
 321 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 322 {
 323         kfree(hard_iface->bat_iv.ogm_buff);
 324         hard_iface->bat_iv.ogm_buff = NULL;
 325 }
 326
 327 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 328 {
 329         struct batadv_ogm_packet *batadv_ogm_packet;
 330         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 331
 332         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 333         memcpy(batadv_ogm_packet->orig,
 334                hard_iface->net_dev->dev_addr, ETH_ALEN);
 335         memcpy(batadv_ogm_packet->prev_sender,
 336                hard_iface->net_dev->dev_addr, ETH_ALEN);
 337 }
 338
 339 static void
 340 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 341 {
 342         struct batadv_ogm_packet *batadv_ogm_packet;
 343         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 344
 345         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 346         batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
 347         batadv_ogm_packet->ttl = BATADV_TTL;
 348 }
 349
 350 /* when do we schedule our own ogm to be sent */
 351 static unsigned long
 352 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 353 {
 354         unsigned int msecs;
 355
 356         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 357         msecs += prandom_u32() % (2 * BATADV_JITTER);
 358
 359         return jiffies + msecs_to_jiffies(msecs);
 360 }
 361
 362 /* when do we schedule a ogm packet to be sent */
 363 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 364 {
 365         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 366 }
 367
 368 /* apply hop penalty for a normal link */
 369 static uint8_t batadv_hop_penalty(uint8_t tq,
 370                                   const struct batadv_priv *bat_priv)
 371 {
 372         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 373         int new_tq;
 374
 375         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 376         new_tq /= BATADV_TQ_MAX_VALUE;
 377
 378         return new_tq;
 379 }
 380
 381 /* is there another aggregated packet here? */
 382 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 383                                      __be16 tvlv_len)
 384 {
 385         int next_buff_pos = 0;
 386
 387         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 388         next_buff_pos += ntohs(tvlv_len);
 389
 390         return (next_buff_pos <= packet_len) &&
 391                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 392 }
 393
 394 /* send a batman ogm to a given interface */
 395 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 396                                      struct batadv_hard_iface *hard_iface)
 397 {
 398         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 399         char *fwd_str;
 400         uint8_t packet_num;
 401         int16_t buff_pos;
 402         struct batadv_ogm_packet *batadv_ogm_packet;
 403         struct sk_buff *skb;
 404         uint8_t *packet_pos;
 405
 406         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 407                 return;
 408
 409         packet_num = 0;
 410         buff_pos = 0;
 411         packet_pos = forw_packet->skb->data;
 412         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 413
 414         /* adjust all flags and log packets */
 415         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 416                                          batadv_ogm_packet->tvlv_len)) {
 417                 /* we might have aggregated direct link packets with an
 418                  * ordinary base packet
 419                  */
 420                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 421                     forw_packet->if_incoming == hard_iface)
 422                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 423                 else
 424                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 425
 426                 if (packet_num > 0 || !forw_packet->own)
 427                         fwd_str = "Forwarding";
 428                 else
 429                         fwd_str = "Sending own";
 430
 431                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 432                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 433                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 434                            batadv_ogm_packet->orig,
 435                            ntohl(batadv_ogm_packet->seqno),
 436                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 437                            (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
 438                             "on" : "off"),
 439                            hard_iface->net_dev->name,
 440                            hard_iface->net_dev->dev_addr);
 441
 442                 buff_pos += BATADV_OGM_HLEN;
 443                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 444                 packet_num++;
 445                 packet_pos = forw_packet->skb->data + buff_pos;
 446                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 447         }
 448
 449         /* create clone because function is called more than once */
 450         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 451         if (skb) {
 452                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 453                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 454                                    skb->len + ETH_HLEN);
 455                 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 456         }
 457 }
 458
 459 /* send a batman ogm packet */
 460 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 461 {
 462         struct batadv_hard_iface *hard_iface;
 463         struct net_device *soft_iface;
 464         struct batadv_priv *bat_priv;
 465         struct batadv_hard_iface *primary_if = NULL;
 466         struct batadv_ogm_packet *batadv_ogm_packet;
 467         unsigned char directlink;
 468         uint8_t *packet_pos;
 469
 470         packet_pos = forw_packet->skb->data;
 471         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 472         directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
 473
 474         if (!forw_packet->if_incoming) {
 475                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 476                 goto out;
 477         }
 478
 479         soft_iface = forw_packet->if_incoming->soft_iface;
 480         bat_priv = netdev_priv(soft_iface);
 481
 482         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 483                 goto out;
 484
 485         primary_if = batadv_primary_if_get_selected(bat_priv);
 486         if (!primary_if)
 487                 goto out;
 488
 489         /* multihomed peer assumed
 490          * non-primary OGMs are only broadcasted on their interface
 491          */
 492         if ((directlink && (batadv_ogm_packet->ttl == 1)) ||
 493             (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
 494                 /* FIXME: what about aggregated packets ? */
 495                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 496                            "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
 497                            (forw_packet->own ? "Sending own" : "Forwarding"),
 498                            batadv_ogm_packet->orig,
 499                            ntohl(batadv_ogm_packet->seqno),
 500                            batadv_ogm_packet->ttl,
 501                            forw_packet->if_incoming->net_dev->name,
 502                            forw_packet->if_incoming->net_dev->dev_addr);
 503
 504                 /* skb is only used once and than forw_packet is free'd */
 505                 batadv_send_skb_packet(forw_packet->skb,
 506                                        forw_packet->if_incoming,
 507                                        batadv_broadcast_addr);
 508                 forw_packet->skb = NULL;
 509
 510                 goto out;
 511         }
 512
 513         /* broadcast on every interface */
 514         rcu_read_lock();
 515         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 516                 if (hard_iface->soft_iface != soft_iface)
 517                         continue;
 518
 519                 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
 520         }
 521         rcu_read_unlock();
 522
 523 out:
 524         if (primary_if)
 525                 batadv_hardif_free_ref(primary_if);
 526 }
 527
 528 /* return true if new_packet can be aggregated with forw_packet */
 529 static bool
 530 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 531                             struct batadv_priv *bat_priv,
 532                             int packet_len, unsigned long send_time,
 533                             bool directlink,
 534                             const struct batadv_hard_iface *if_incoming,
 535                             const struct batadv_forw_packet *forw_packet)
 536 {
 537         struct batadv_ogm_packet *batadv_ogm_packet;
 538         int aggregated_bytes = forw_packet->packet_len + packet_len;
 539         struct batadv_hard_iface *primary_if = NULL;
 540         bool res = false;
 541         unsigned long aggregation_end_time;
 542
 543         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 544         aggregation_end_time = send_time;
 545         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 546
 547         /* we can aggregate the current packet to this aggregated packet
 548          * if:
 549          *
 550          * - the send time is within our MAX_AGGREGATION_MS time
 551          * - the resulting packet wont be bigger than
 552          *   MAX_AGGREGATION_BYTES
 553          */
 554         if (time_before(send_time, forw_packet->send_time) &&
 555             time_after_eq(aggregation_end_time, forw_packet->send_time) &&
 556             (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
 557                 /* check aggregation compatibility
 558                  * -> direct link packets are broadcasted on
 559                  *    their interface only
 560                  * -> aggregate packet if the current packet is
 561                  *    a "global" packet as well as the base
 562                  *    packet
 563                  */
 564                 primary_if = batadv_primary_if_get_selected(bat_priv);
 565                 if (!primary_if)
 566                         goto out;
 567
 568                 /* packets without direct link flag and high TTL
 569                  * are flooded through the net
 570                  */
 571                 if ((!directlink) &&
 572                     (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
 573                     (batadv_ogm_packet->ttl != 1) &&
 574
 575                     /* own packets originating non-primary
 576                      * interfaces leave only that interface
 577                      */
 578                     ((!forw_packet->own) ||
 579                      (forw_packet->if_incoming == primary_if))) {
 580                         res = true;
 581                         goto out;
 582                 }
 583
 584                 /* if the incoming packet is sent via this one
 585                  * interface only - we still can aggregate
 586                  */
 587                 if ((directlink) &&
 588                     (new_bat_ogm_packet->ttl == 1) &&
 589                     (forw_packet->if_incoming == if_incoming) &&
 590
 591                     /* packets from direct neighbors or
 592                      * own secondary interface packets
 593                      * (= secondary interface packets in general)
 594                      */
 595                     (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 596                      (forw_packet->own &&
 597                       forw_packet->if_incoming != primary_if))) {
 598                         res = true;
 599                         goto out;
 600                 }
 601         }
 602
 603 out:
 604         if (primary_if)
 605                 batadv_hardif_free_ref(primary_if);
 606         return res;
 607 }
 608
 609 /* create a new aggregated packet and add this packet to it */
 610 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 611                                         int packet_len, unsigned long send_time,
 612                                         bool direct_link,
 613                                         struct batadv_hard_iface *if_incoming,
 614                                         int own_packet)
 615 {
 616         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 617         struct batadv_forw_packet *forw_packet_aggr;
 618         unsigned char *skb_buff;
 619         unsigned int skb_size;
 620
 621         if (!atomic_inc_not_zero(&if_incoming->refcount))
 622                 return;
 623
 624         /* own packet should always be scheduled */
 625         if (!own_packet) {
 626                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 627                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 628                                    "batman packet queue full\n");
 629                         goto out;
 630                 }
 631         }
 632
 633         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 634         if (!forw_packet_aggr) {
 635                 if (!own_packet)
 636                         atomic_inc(&bat_priv->batman_queue_left);
 637                 goto out;
 638         }
 639
 640         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 641             (packet_len < BATADV_MAX_AGGREGATION_BYTES))
 642                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 643         else
 644                 skb_size = packet_len;
 645
 646         skb_size += ETH_HLEN;
 647
 648         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 649         if (!forw_packet_aggr->skb) {
 650                 if (!own_packet)
 651                         atomic_inc(&bat_priv->batman_queue_left);
 652                 kfree(forw_packet_aggr);
 653                 goto out;
 654         }
 655         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 656         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 657
 658         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 659         forw_packet_aggr->packet_len = packet_len;
 660         memcpy(skb_buff, packet_buff, packet_len);
 661
 662         forw_packet_aggr->own = own_packet;
 663         forw_packet_aggr->if_incoming = if_incoming;
 664         forw_packet_aggr->num_packets = 0;
 665         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 666         forw_packet_aggr->send_time = send_time;
 667
 668         /* save packet direct link flag status */
 669         if (direct_link)
 670                 forw_packet_aggr->direct_link_flags |= 1;
 671
 672         /* add new packet to packet list */
 673         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 674         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 675         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 676
 677         /* start timer for this packet */
 678         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 679                           batadv_send_outstanding_bat_ogm_packet);
 680         queue_delayed_work(batadv_event_workqueue,
 681                            &forw_packet_aggr->delayed_work,
 682                            send_time - jiffies);
 683
 684         return;
 685 out:
 686         batadv_hardif_free_ref(if_incoming);
 687 }
 688
 689 /* aggregate a new packet into the existing ogm packet */
 690 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 691                                     const unsigned char *packet_buff,
 692                                     int packet_len, bool direct_link)
 693 {
 694         unsigned char *skb_buff;
 695         unsigned long new_direct_link_flag;
 696
 697         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 698         memcpy(skb_buff, packet_buff, packet_len);
 699         forw_packet_aggr->packet_len += packet_len;
 700         forw_packet_aggr->num_packets++;
 701
 702         /* save packet direct link flag status */
 703         if (direct_link) {
 704                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 705                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 706         }
 707 }
 708
 709 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 710                                     unsigned char *packet_buff,
 711                                     int packet_len,
 712                                     struct batadv_hard_iface *if_incoming,
 713                                     int own_packet, unsigned long send_time)
 714 {
 715         /* _aggr -> pointer to the packet we want to aggregate with
 716          * _pos -> pointer to the position in the queue
 717          */
 718         struct batadv_forw_packet *forw_packet_aggr = NULL;
 719         struct batadv_forw_packet *forw_packet_pos = NULL;
 720         struct batadv_ogm_packet *batadv_ogm_packet;
 721         bool direct_link;
 722         unsigned long max_aggregation_jiffies;
 723
 724         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 725         direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
 726         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 727
 728         /* find position for the packet in the forward queue */
 729         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 730         /* own packets are not to be aggregated */
 731         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 732                 hlist_for_each_entry(forw_packet_pos,
 733                                      &bat_priv->forw_bat_list, list) {
 734                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 735                                                         bat_priv, packet_len,
 736                                                         send_time, direct_link,
 737                                                         if_incoming,
 738                                                         forw_packet_pos)) {
 739                                 forw_packet_aggr = forw_packet_pos;
 740                                 break;
 741                         }
 742                 }
 743         }
 744
 745         /* nothing to aggregate with - either aggregation disabled or no
 746          * suitable aggregation packet found
 747          */
 748         if (!forw_packet_aggr) {
 749                 /* the following section can run without the lock */
 750                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 751
 752                 /* if we could not aggregate this packet with one of the others
 753                  * we hold it back for a while, so that it might be aggregated
 754                  * later on
 755                  */
 756                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 757                         send_time += max_aggregation_jiffies;
 758
 759                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 760                                             send_time, direct_link,
 761                                             if_incoming, own_packet);
 762         } else {
 763                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 764                                         packet_len, direct_link);
 765                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 766         }
 767 }
 768
 769 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 770                                   const struct ethhdr *ethhdr,
 771                                   struct batadv_ogm_packet *batadv_ogm_packet,
 772                                   bool is_single_hop_neigh,
 773                                   bool is_from_best_next_hop,
 774                                   struct batadv_hard_iface *if_incoming)
 775 {
 776         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 777         uint16_t tvlv_len;
 778
 779         if (batadv_ogm_packet->ttl <= 1) {
 780                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 781                 return;
 782         }
 783
 784         if (!is_from_best_next_hop) {
 785                 /* Mark the forwarded packet when it is not coming from our
 786                  * best next hop. We still need to forward the packet for our
 787                  * neighbor link quality detection to work in case the packet
 788                  * originated from a single hop neighbor. Otherwise we can
 789                  * simply drop the ogm.
 790                  */
 791                 if (is_single_hop_neigh)
 792                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 793                 else
 794                         return;
 795         }
 796
 797         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 798
 799         batadv_ogm_packet->ttl--;
 800         memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 801
 802         /* apply hop penalty */
 803         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 804                                                    bat_priv);
 805
 806         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 807                    "Forwarding packet: tq: %i, ttl: %i\n",
 808                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 809
 810         /* switch of primaries first hop flag when forwarding */
 811         batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
 812         if (is_single_hop_neigh)
 813                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 814         else
 815                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 816
 817         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 818                                 BATADV_OGM_HLEN + tvlv_len,
 819                                 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
 820 }
 821
 822 /**
 823  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 824  * the given interface
 825  * @hard_iface: the interface for which the windows have to be shifted
 826  */
 827 static void
 828 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 829 {
 830         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 831         struct batadv_hashtable *hash = bat_priv->orig_hash;
 832         struct hlist_head *head;
 833         struct batadv_orig_node *orig_node;
 834         unsigned long *word;
 835         uint32_t i;
 836         size_t word_index;
 837         uint8_t *w;
 838         int if_num;
 839
 840         for (i = 0; i < hash->size; i++) {
 841                 head = &hash->table[i];
 842
 843                 rcu_read_lock();
 844                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 845                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 846                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 847                         word = &(orig_node->bat_iv.bcast_own[word_index]);
 848
 849                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 850                         if_num = hard_iface->if_num;
 851                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 852                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 853                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 854                 }
 855                 rcu_read_unlock();
 856         }
 857 }
 858
 859 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 860 {
 861         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 862         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 863         struct batadv_ogm_packet *batadv_ogm_packet;
 864         struct batadv_hard_iface *primary_if;
 865         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 866         uint32_t seqno;
 867         uint16_t tvlv_len = 0;
 868
 869         primary_if = batadv_primary_if_get_selected(bat_priv);
 870
 871         if (hard_iface == primary_if) {
 872                 /* tt changes have to be committed before the tvlv data is
 873                  * appended as it may alter the tt tvlv container
 874                  */
 875                 batadv_tt_local_commit_changes(bat_priv);
 876                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 877                                                             ogm_buff_len,
 878                                                             BATADV_OGM_HLEN);
 879         }
 880
 881         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 882         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 883
 884         /* change sequence number to network order */
 885         seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 886         batadv_ogm_packet->seqno = htonl(seqno);
 887         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 888
 889         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 890         batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
 891                                 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
 892                                 batadv_iv_ogm_emit_send_time(bat_priv));
 893
 894         if (primary_if)
 895                 batadv_hardif_free_ref(primary_if);
 896 }
 897
 898 static void
 899 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 900                           struct batadv_orig_node *orig_node,
 901                           const struct ethhdr *ethhdr,
 902                           const struct batadv_ogm_packet *batadv_ogm_packet,
 903                           struct batadv_hard_iface *if_incoming,
 904                           const unsigned char *tt_buff,
 905                           enum batadv_dup_status dup_status)
 906 {
 907         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 908         struct batadv_neigh_node *router = NULL;
 909         struct batadv_orig_node *orig_node_tmp;
 910         int if_num;
 911         uint8_t sum_orig, sum_neigh;
 912         uint8_t *neigh_addr;
 913         uint8_t tq_avg;
 914
 915         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 916                    "update_originator(): Searching and updating originator entry of received packet\n");
 917
 918         rcu_read_lock();
 919         hlist_for_each_entry_rcu(tmp_neigh_node,
 920                                  &orig_node->neigh_list, list) {
 921                 neigh_addr = tmp_neigh_node->addr;
 922                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 923                     tmp_neigh_node->if_incoming == if_incoming &&
 924                     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 925                         if (WARN(neigh_node, "too many matching neigh_nodes"))
 926                                 batadv_neigh_node_free_ref(neigh_node);
 927                         neigh_node = tmp_neigh_node;
 928                         continue;
 929                 }
 930
 931                 if (dup_status != BATADV_NO_DUP)
 932                         continue;
 933
 934                 spin_lock_bh(&tmp_neigh_node->bat_iv.lq_update_lock);
 935                 batadv_ring_buffer_set(tmp_neigh_node->bat_iv.tq_recv,
 936                                        &tmp_neigh_node->bat_iv.tq_index, 0);
 937                 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->bat_iv.tq_recv);
 938                 tmp_neigh_node->bat_iv.tq_avg = tq_avg;
 939                 spin_unlock_bh(&tmp_neigh_node->bat_iv.lq_update_lock);
 940         }
 941
 942         if (!neigh_node) {
 943                 struct batadv_orig_node *orig_tmp;
 944
 945                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
 946                 if (!orig_tmp)
 947                         goto unlock;
 948
 949                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
 950                                                      ethhdr->h_source,
 951                                                      orig_node, orig_tmp);
 952
 953                 batadv_orig_node_free_ref(orig_tmp);
 954                 if (!neigh_node)
 955                         goto unlock;
 956         } else
 957                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 958                            "Updating existing last-hop neighbor of originator\n");
 959
 960         rcu_read_unlock();
 961
 962         neigh_node->last_seen = jiffies;
 963
 964         spin_lock_bh(&neigh_node->bat_iv.lq_update_lock);
 965         batadv_ring_buffer_set(neigh_node->bat_iv.tq_recv,
 966                                &neigh_node->bat_iv.tq_index,
 967                                batadv_ogm_packet->tq);
 968         tq_avg = batadv_ring_buffer_avg(neigh_node->bat_iv.tq_recv);
 969         neigh_node->bat_iv.tq_avg = tq_avg;
 970         spin_unlock_bh(&neigh_node->bat_iv.lq_update_lock);
 971
 972         if (dup_status == BATADV_NO_DUP) {
 973                 orig_node->last_ttl = batadv_ogm_packet->ttl;
 974                 neigh_node->last_ttl = batadv_ogm_packet->ttl;
 975         }
 976
 977         /* if this neighbor already is our next hop there is nothing
 978          * to change
 979          */
 980         router = batadv_orig_node_get_router(orig_node);
 981         if (router == neigh_node)
 982                 goto out;
 983
 984         /* if this neighbor does not offer a better TQ we won't consider it */
 985         if (router && (router->bat_iv.tq_avg > neigh_node->bat_iv.tq_avg))
 986                 goto out;
 987
 988         /* if the TQ is the same and the link not more symmetric we
 989          * won't consider it either
 990          */
 991         if (router && (neigh_node->bat_iv.tq_avg == router->bat_iv.tq_avg)) {
 992                 orig_node_tmp = router->orig_node;
 993                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
 994                 if_num = router->if_incoming->if_num;
 995                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
 996                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
 997
 998                 orig_node_tmp = neigh_node->orig_node;
 999                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1000                 if_num = neigh_node->if_incoming->if_num;
1001                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1002                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1003
1004                 if (sum_orig >= sum_neigh)
1005                         goto out;
1006         }
1007
1008         batadv_update_route(bat_priv, orig_node, neigh_node);
1009         goto out;
1010
1011 unlock:
1012         rcu_read_unlock();
1013 out:
1014         if (neigh_node)
1015                 batadv_neigh_node_free_ref(neigh_node);
1016         if (router)
1017                 batadv_neigh_node_free_ref(router);
1018 }
1019
1020 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1021                                  struct batadv_orig_node *orig_neigh_node,
1022                                  struct batadv_ogm_packet *batadv_ogm_packet,
1023                                  struct batadv_hard_iface *if_incoming)
1024 {
1025         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1026         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1027         uint8_t total_count;
1028         uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1029         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1030         int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
1031         unsigned int combined_tq;
1032
1033         /* find corresponding one hop neighbor */
1034         rcu_read_lock();
1035         hlist_for_each_entry_rcu(tmp_neigh_node,
1036                                  &orig_neigh_node->neigh_list, list) {
1037                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1038                                         orig_neigh_node->orig))
1039                         continue;
1040
1041                 if (tmp_neigh_node->if_incoming != if_incoming)
1042                         continue;
1043
1044                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1045                         continue;
1046
1047                 neigh_node = tmp_neigh_node;
1048                 break;
1049         }
1050         rcu_read_unlock();
1051
1052         if (!neigh_node)
1053                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1054                                                      orig_neigh_node->orig,
1055                                                      orig_neigh_node,
1056                                                      orig_neigh_node);
1057
1058         if (!neigh_node)
1059                 goto out;
1060
1061         /* if orig_node is direct neighbor update neigh_node last_seen */
1062         if (orig_node == orig_neigh_node)
1063                 neigh_node->last_seen = jiffies;
1064
1065         orig_node->last_seen = jiffies;
1066
1067         /* find packet count of corresponding one hop neighbor */
1068         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1069         if_num = if_incoming->if_num;
1070         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1071         neigh_rq_count = neigh_node->bat_iv.real_packet_count;
1072         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1073
1074         /* pay attention to not get a value bigger than 100 % */
1075         if (orig_eq_count > neigh_rq_count)
1076                 total_count = neigh_rq_count;
1077         else
1078                 total_count = orig_eq_count;
1079
1080         /* if we have too few packets (too less data) we set tq_own to zero
1081          * if we receive too few packets it is not considered bidirectional
1082          */
1083         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1084             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1085                 tq_own = 0;
1086         else
1087                 /* neigh_node->real_packet_count is never zero as we
1088                  * only purge old information when getting new
1089                  * information
1090                  */
1091                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1092
1093         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1094          * affect the nearly-symmetric links only a little, but
1095          * punishes asymmetric links more.  This will give a value
1096          * between 0 and TQ_MAX_VALUE
1097          */
1098         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1099         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1100         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1101                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1102                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1103         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1104         inv_asym_penalty /= neigh_rq_max_cube;
1105         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1106
1107         combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
1108         combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
1109         batadv_ogm_packet->tq = combined_tq;
1110
1111         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1112                    "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
1113                    orig_node->orig, orig_neigh_node->orig, total_count,
1114                    neigh_rq_count, tq_own,
1115                    tq_asym_penalty, batadv_ogm_packet->tq);
1116
1117         /* if link has the minimum required transmission quality
1118          * consider it bidirectional
1119          */
1120         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1121                 ret = 1;
1122
1123 out:
1124         if (neigh_node)
1125                 batadv_neigh_node_free_ref(neigh_node);
1126         return ret;
1127 }
1128
1129 /**
1130  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1131  *  adjust the sequence number and find out whether it is a duplicate
1132  * @ethhdr: ethernet header of the packet
1133  * @batadv_ogm_packet: OGM packet to be considered
1134  * @if_incoming: interface on which the OGM packet was received
1135  *
1136  * Returns duplicate status as enum batadv_dup_status
1137  */
1138 static enum batadv_dup_status
1139 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1140                             const struct batadv_ogm_packet *batadv_ogm_packet,
1141                             const struct batadv_hard_iface *if_incoming)
1142 {
1143         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1144         struct batadv_orig_node *orig_node;
1145         struct batadv_neigh_node *tmp_neigh_node;
1146         int is_dup;
1147         int32_t seq_diff;
1148         int need_update = 0;
1149         int set_mark;
1150         enum batadv_dup_status ret = BATADV_NO_DUP;
1151         uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
1152         uint8_t *neigh_addr;
1153         uint8_t packet_count;
1154         unsigned long *bitmap;
1155
1156         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1157         if (!orig_node)
1158                 return BATADV_NO_DUP;
1159
1160         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1161         seq_diff = seqno - orig_node->last_real_seqno;
1162
1163         /* signalize caller that the packet is to be dropped. */
1164         if (!hlist_empty(&orig_node->neigh_list) &&
1165             batadv_window_protected(bat_priv, seq_diff,
1166                                     &orig_node->batman_seqno_reset)) {
1167                 ret = BATADV_PROTECTED;
1168                 goto out;
1169         }
1170
1171         rcu_read_lock();
1172         hlist_for_each_entry_rcu(tmp_neigh_node,
1173                                  &orig_node->neigh_list, list) {
1174                 neigh_addr = tmp_neigh_node->addr;
1175                 is_dup = batadv_test_bit(tmp_neigh_node->bat_iv.real_bits,
1176                                          orig_node->last_real_seqno,
1177                                          seqno);
1178
1179                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1180                     tmp_neigh_node->if_incoming == if_incoming) {
1181                         set_mark = 1;
1182                         if (is_dup)
1183                                 ret = BATADV_NEIGH_DUP;
1184                 } else {
1185                         set_mark = 0;
1186                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1187                                 ret = BATADV_ORIG_DUP;
1188                 }
1189
1190                 /* if the window moved, set the update flag. */
1191                 bitmap = tmp_neigh_node->bat_iv.real_bits;
1192                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1193                                                      seq_diff, set_mark);
1194
1195                 packet_count = bitmap_weight(tmp_neigh_node->bat_iv.real_bits,
1196                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1197                 tmp_neigh_node->bat_iv.real_packet_count = packet_count;
1198         }
1199         rcu_read_unlock();
1200
1201         if (need_update) {
1202                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1203                            "updating last_seqno: old %u, new %u\n",
1204                            orig_node->last_real_seqno, seqno);
1205                 orig_node->last_real_seqno = seqno;
1206         }
1207
1208 out:
1209         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1210         batadv_orig_node_free_ref(orig_node);
1211         return ret;
1212 }
1213
1214 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
1215                                   struct batadv_ogm_packet *batadv_ogm_packet,
1216                                   const unsigned char *tt_buff,
1217                                   struct batadv_hard_iface *if_incoming)
1218 {
1219         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1220         struct batadv_hard_iface *hard_iface;
1221         struct batadv_orig_node *orig_neigh_node, *orig_node, *orig_node_tmp;
1222         struct batadv_neigh_node *router = NULL, *router_router = NULL;
1223         struct batadv_neigh_node *orig_neigh_router = NULL;
1224         int has_directlink_flag;
1225         int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
1226         int is_bidirect;
1227         bool is_single_hop_neigh = false;
1228         bool is_from_best_next_hop = false;
1229         int sameseq, similar_ttl;
1230         enum batadv_dup_status dup_status;
1231         uint32_t if_incoming_seqno;
1232         uint8_t *prev_sender;
1233
1234         /* Silently drop when the batman packet is actually not a
1235          * correct packet.
1236          *
1237          * This might happen if a packet is padded (e.g. Ethernet has a
1238          * minimum frame length of 64 byte) and the aggregation interprets
1239          * it as an additional length.
1240          *
1241          * TODO: A more sane solution would be to have a bit in the
1242          * batadv_ogm_packet to detect whether the packet is the last
1243          * packet in an aggregation.  Here we expect that the padding
1244          * is always zero (or not 0x01)
1245          */
1246         if (batadv_ogm_packet->packet_type != BATADV_IV_OGM)
1247                 return;
1248
1249         /* could be changed by schedule_own_packet() */
1250         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1251
1252         if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1253                 has_directlink_flag = 1;
1254         else
1255                 has_directlink_flag = 0;
1256
1257         if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1258                 is_single_hop_neigh = true;
1259
1260         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1261                    "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, tq %d, TTL %d, V %d, IDF %d)\n",
1262                    ethhdr->h_source, if_incoming->net_dev->name,
1263                    if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1264                    batadv_ogm_packet->prev_sender,
1265                    ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->tq,
1266                    batadv_ogm_packet->ttl,
1267                    batadv_ogm_packet->version, has_directlink_flag);
1268
1269         rcu_read_lock();
1270         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1271                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1272                         continue;
1273
1274                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1275                         continue;
1276
1277                 if (batadv_compare_eth(ethhdr->h_source,
1278                                        hard_iface->net_dev->dev_addr))
1279                         is_my_addr = 1;
1280
1281                 if (batadv_compare_eth(batadv_ogm_packet->orig,
1282                                        hard_iface->net_dev->dev_addr))
1283                         is_my_orig = 1;
1284
1285                 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1286                                        hard_iface->net_dev->dev_addr))
1287                         is_my_oldorig = 1;
1288         }
1289         rcu_read_unlock();
1290
1291         if (is_my_addr) {
1292                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1293                            "Drop packet: received my own broadcast (sender: %pM)\n",
1294                            ethhdr->h_source);
1295                 return;
1296         }
1297
1298         if (is_my_orig) {
1299                 unsigned long *word;
1300                 int offset;
1301                 int32_t bit_pos;
1302                 int16_t if_num;
1303                 uint8_t *weight;
1304
1305                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1306                                                          ethhdr->h_source);
1307                 if (!orig_neigh_node)
1308                         return;
1309
1310                 /* neighbor has to indicate direct link and it has to
1311                  * come via the corresponding interface
1312                  * save packet seqno for bidirectional check
1313                  */
1314                 if (has_directlink_flag &&
1315                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1316                                        batadv_ogm_packet->orig)) {
1317                         if_num = if_incoming->if_num;
1318                         offset = if_num * BATADV_NUM_WORDS;
1319
1320                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1321                         word = &(orig_neigh_node->bat_iv.bcast_own[offset]);
1322                         bit_pos = if_incoming_seqno - 2;
1323                         bit_pos -= ntohl(batadv_ogm_packet->seqno);
1324                         batadv_set_bit(word, bit_pos);
1325                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1326                         *weight = bitmap_weight(word,
1327                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1328                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1329                 }
1330
1331                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1332                            "Drop packet: originator packet from myself (via neighbor)\n");
1333                 batadv_orig_node_free_ref(orig_neigh_node);
1334                 return;
1335         }
1336
1337         if (is_my_oldorig) {
1338                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1339                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1340                            ethhdr->h_source);
1341                 return;
1342         }
1343
1344         if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1345                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1346                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1347                            ethhdr->h_source);
1348                 return;
1349         }
1350
1351         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1352         if (!orig_node)
1353                 return;
1354
1355         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1356                                                  if_incoming);
1357
1358         if (dup_status == BATADV_PROTECTED) {
1359                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1360                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1361                            ethhdr->h_source);
1362                 goto out;
1363         }
1364
1365         if (batadv_ogm_packet->tq == 0) {
1366                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1367                            "Drop packet: originator packet with tq equal 0\n");
1368                 goto out;
1369         }
1370
1371         router = batadv_orig_node_get_router(orig_node);
1372         if (router) {
1373                 orig_node_tmp = router->orig_node;
1374                 router_router = batadv_orig_node_get_router(orig_node_tmp);
1375         }
1376
1377         if ((router && router->bat_iv.tq_avg != 0) &&
1378             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1379                 is_from_best_next_hop = true;
1380
1381         prev_sender = batadv_ogm_packet->prev_sender;
1382         /* avoid temporary routing loops */
1383         if (router && router_router &&
1384             (batadv_compare_eth(router->addr, prev_sender)) &&
1385             !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1386             (batadv_compare_eth(router->addr, router_router->addr))) {
1387                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1388                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1389                            ethhdr->h_source);
1390                 goto out;
1391         }
1392
1393         batadv_tvlv_ogm_receive(bat_priv, batadv_ogm_packet, orig_node);
1394
1395         /* if sender is a direct neighbor the sender mac equals
1396          * originator mac
1397          */
1398         if (is_single_hop_neigh)
1399                 orig_neigh_node = orig_node;
1400         else
1401                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1402                                                          ethhdr->h_source);
1403
1404         if (!orig_neigh_node)
1405                 goto out;
1406
1407         /* Update nc_nodes of the originator */
1408         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1409                                  batadv_ogm_packet, is_single_hop_neigh);
1410
1411         orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1412
1413         /* drop packet if sender is not a direct neighbor and if we
1414          * don't route towards it
1415          */
1416         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1417                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1418                            "Drop packet: OGM via unknown neighbor!\n");
1419                 goto out_neigh;
1420         }
1421
1422         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1423                                             batadv_ogm_packet, if_incoming);
1424
1425         /* update ranking if it is not a duplicate or has the same
1426          * seqno and similar ttl as the non-duplicate
1427          */
1428         sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1429         similar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->ttl;
1430         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1431                             (sameseq && similar_ttl)))
1432                 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1433                                           batadv_ogm_packet, if_incoming,
1434                                           tt_buff, dup_status);
1435
1436         /* is single hop (direct) neighbor */
1437         if (is_single_hop_neigh) {
1438                 /* mark direct link on incoming interface */
1439                 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1440                                       is_single_hop_neigh,
1441                                       is_from_best_next_hop, if_incoming);
1442
1443                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1444                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1445                 goto out_neigh;
1446         }
1447
1448         /* multihop originator */
1449         if (!is_bidirect) {
1450                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1451                            "Drop packet: not received via bidirectional link\n");
1452                 goto out_neigh;
1453         }
1454
1455         if (dup_status == BATADV_NEIGH_DUP) {
1456                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1457                            "Drop packet: duplicate packet received\n");
1458                 goto out_neigh;
1459         }
1460
1461         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1462                    "Forwarding packet: rebroadcast originator packet\n");
1463         batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1464                               is_single_hop_neigh, is_from_best_next_hop,
1465                               if_incoming);
1466
1467 out_neigh:
1468         if ((orig_neigh_node) && (!is_single_hop_neigh))
1469                 batadv_orig_node_free_ref(orig_neigh_node);
1470 out:
1471         if (router)
1472                 batadv_neigh_node_free_ref(router);
1473         if (router_router)
1474                 batadv_neigh_node_free_ref(router_router);
1475         if (orig_neigh_router)
1476                 batadv_neigh_node_free_ref(orig_neigh_router);
1477
1478         batadv_orig_node_free_ref(orig_node);
1479 }
1480
1481 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1482                                  struct batadv_hard_iface *if_incoming)
1483 {
1484         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1485         struct batadv_ogm_packet *batadv_ogm_packet;
1486         struct ethhdr *ethhdr;
1487         int buff_pos = 0, packet_len;
1488         unsigned char *tvlv_buff, *packet_buff;
1489         uint8_t *packet_pos;
1490         bool ret;
1491
1492         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1493         if (!ret)
1494                 return NET_RX_DROP;
1495
1496         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1497          * that does not have B.A.T.M.A.N. IV enabled ?
1498          */
1499         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1500                 return NET_RX_DROP;
1501
1502         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1503         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1504                            skb->len + ETH_HLEN);
1505
1506         packet_len = skb_headlen(skb);
1507         ethhdr = eth_hdr(skb);
1508         packet_buff = skb->data;
1509         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1510
1511         /* unpack the aggregated packets and process them one by one */
1512         while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1513                                          batadv_ogm_packet->tvlv_len)) {
1514                 tvlv_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1515
1516                 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet,
1517                                       tvlv_buff, if_incoming);
1518
1519                 buff_pos += BATADV_OGM_HLEN;
1520                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
1521
1522                 packet_pos = packet_buff + buff_pos;
1523                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1524         }
1525
1526         kfree_skb(skb);
1527         return NET_RX_SUCCESS;
1528 }
1529
1530 /**
1531  * batadv_iv_ogm_orig_print - print the originator table
1532  * @bat_priv: the bat priv with all the soft interface information
1533  * @seq: debugfs table seq_file struct
1534  */
1535 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1536                                      struct seq_file *seq)
1537 {
1538         struct batadv_neigh_node *neigh_node, *neigh_node_tmp;
1539         struct batadv_hashtable *hash = bat_priv->orig_hash;
1540         int last_seen_msecs, last_seen_secs;
1541         struct batadv_orig_node *orig_node;
1542         unsigned long last_seen_jiffies;
1543         struct hlist_head *head;
1544         int batman_count = 0;
1545         uint32_t i;
1546
1547         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1548                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1549                    "Nexthop", "outgoingIF", "Potential nexthops");
1550
1551         for (i = 0; i < hash->size; i++) {
1552                 head = &hash->table[i];
1553
1554                 rcu_read_lock();
1555                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1556                         neigh_node = batadv_orig_node_get_router(orig_node);
1557                         if (!neigh_node)
1558                                 continue;
1559
1560                         if (neigh_node->bat_iv.tq_avg == 0)
1561                                 goto next;
1562
1563                         last_seen_jiffies = jiffies - orig_node->last_seen;
1564                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1565                         last_seen_secs = last_seen_msecs / 1000;
1566                         last_seen_msecs = last_seen_msecs % 1000;
1567
1568                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1569                                    orig_node->orig, last_seen_secs,
1570                                    last_seen_msecs, neigh_node->bat_iv.tq_avg,
1571                                    neigh_node->addr,
1572                                    neigh_node->if_incoming->net_dev->name);
1573
1574                         hlist_for_each_entry_rcu(neigh_node_tmp,
1575                                                  &orig_node->neigh_list, list) {
1576                                 seq_printf(seq, " %pM (%3i)",
1577                                            neigh_node_tmp->addr,
1578                                            neigh_node_tmp->bat_iv.tq_avg);
1579                         }
1580
1581                         seq_puts(seq, "\n");
1582                         batman_count++;
1583
1584 next:
1585                         batadv_neigh_node_free_ref(neigh_node);
1586                 }
1587                 rcu_read_unlock();
1588         }
1589
1590         if (batman_count == 0)
1591                 seq_puts(seq, "No batman nodes in range ...\n");
1592 }
1593
1594 /**
1595  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1596  * @neigh1: the first neighbor object of the comparison
1597  * @neigh2: the second neighbor object of the comparison
1598  *
1599  * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1600  * lower, the same as or higher than the metric via neigh2
1601  */
1602 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1603                                    struct batadv_neigh_node *neigh2)
1604 {
1605         uint8_t tq1, tq2;
1606
1607         tq1 = neigh1->bat_iv.tq_avg;
1608         tq2 = neigh2->bat_iv.tq_avg;
1609
1610         return tq1 - tq2;
1611 }
1612
1613 /**
1614  * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
1615  *  neigh2 from the metric prospective
1616  * @neigh1: the first neighbor object of the comparison
1617  * @neigh2: the second neighbor object of the comparison
1618  *
1619  * Returns true if the metric via neigh1 is equally good or better than the
1620  * metric via neigh2, false otherwise.
1621  */
1622 static bool batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1,
1623                                        struct batadv_neigh_node *neigh2)
1624 {
1625         int diff = batadv_iv_ogm_neigh_cmp(neigh1, neigh2);
1626
1627         return diff > -BATADV_TQ_SIMILARITY_THRESHOLD;
1628 }
1629
1630 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1631         .name = "BATMAN_IV",
1632         .bat_iface_enable = batadv_iv_ogm_iface_enable,
1633         .bat_iface_disable = batadv_iv_ogm_iface_disable,
1634         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1635         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1636         .bat_ogm_schedule = batadv_iv_ogm_schedule,
1637         .bat_ogm_emit = batadv_iv_ogm_emit,
1638         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
1639         .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
1640         .bat_orig_print = batadv_iv_ogm_orig_print,
1641         .bat_orig_free = batadv_iv_ogm_orig_free,
1642         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
1643         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
1644 };
1645
1646 int __init batadv_iv_init(void)
1647 {
1648         int ret;
1649
1650         /* batman originator packet */
1651         ret = batadv_recv_handler_register(BATADV_IV_OGM,
1652                                            batadv_iv_ogm_receive);
1653         if (ret < 0)
1654                 goto out;
1655
1656         ret = batadv_algo_register(&batadv_batman_iv);
1657         if (ret < 0)
1658                 goto handler_unregister;
1659
1660         goto out;
1661
1662 handler_unregister:
1663         batadv_recv_handler_unregister(BATADV_IV_OGM);
1664 out:
1665         return ret;
1666 }