net/batman-adv/bat_iv_ogm.c

   1 /* Copyright (C) 2007-2014 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 old_size;
 112         int ret = -ENOMEM;
 113
 114         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 115
 116         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 117         data_ptr = kmalloc_array(max_if_num,
 118                                  BATADV_NUM_WORDS * sizeof(unsigned long),
 119                                  GFP_ATOMIC);
 120         if (!data_ptr)
 121                 goto unlock;
 122
 123         memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
 124         kfree(orig_node->bat_iv.bcast_own);
 125         orig_node->bat_iv.bcast_own = data_ptr;
 126
 127         data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC);
 128         if (!data_ptr) {
 129                 kfree(orig_node->bat_iv.bcast_own);
 130                 goto unlock;
 131         }
 132
 133         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 134                (max_if_num - 1) * sizeof(uint8_t));
 135         kfree(orig_node->bat_iv.bcast_own_sum);
 136         orig_node->bat_iv.bcast_own_sum = data_ptr;
 137
 138         ret = 0;
 139
 140 unlock:
 141         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 142
 143         return ret;
 144 }
 145
 146 /**
 147  * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
 148  *  exclude the removed interface
 149  * @orig_node: the orig_node that has to be changed
 150  * @max_if_num: the current amount of interfaces
 151  * @del_if_num: the index of the interface being removed
 152  *
 153  * Returns 0 on success, a negative error code otherwise.
 154  */
 155 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
 156                                      int max_if_num, int del_if_num)
 157 {
 158         int chunk_size,  ret = -ENOMEM, if_offset;
 159         void *data_ptr = NULL;
 160
 161         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 162
 163         /* last interface was removed */
 164         if (max_if_num == 0)
 165                 goto free_bcast_own;
 166
 167         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 168         data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
 169         if (!data_ptr)
 170                 goto unlock;
 171
 172         /* copy first part */
 173         memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
 174
 175         /* copy second part */
 176         memcpy((char *)data_ptr + del_if_num * chunk_size,
 177                orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size),
 178                (max_if_num - del_if_num) * chunk_size);
 179
 180 free_bcast_own:
 181         kfree(orig_node->bat_iv.bcast_own);
 182         orig_node->bat_iv.bcast_own = data_ptr;
 183
 184         if (max_if_num == 0)
 185                 goto free_own_sum;
 186
 187         data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC);
 188         if (!data_ptr) {
 189                 kfree(orig_node->bat_iv.bcast_own);
 190                 goto unlock;
 191         }
 192
 193         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 194                del_if_num * sizeof(uint8_t));
 195
 196         if_offset = (del_if_num + 1) * sizeof(uint8_t);
 197         memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
 198                orig_node->bat_iv.bcast_own_sum + if_offset,
 199                (max_if_num - del_if_num) * sizeof(uint8_t));
 200
 201 free_own_sum:
 202         kfree(orig_node->bat_iv.bcast_own_sum);
 203         orig_node->bat_iv.bcast_own_sum = data_ptr;
 204
 205         ret = 0;
 206 unlock:
 207         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 208
 209         return ret;
 210 }
 211
 212 /**
 213  * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
 214  * @bat_priv: the bat priv with all the soft interface information
 215  * @addr: mac address of the originator
 216  *
 217  * Returns the originator object corresponding to the passed mac address or NULL
 218  * on failure.
 219  * If the object does not exists it is created an initialised.
 220  */
 221 static struct batadv_orig_node *
 222 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr)
 223 {
 224         struct batadv_orig_node *orig_node;
 225         int size, hash_added;
 226
 227         orig_node = batadv_orig_hash_find(bat_priv, addr);
 228         if (orig_node)
 229                 return orig_node;
 230
 231         orig_node = batadv_orig_node_new(bat_priv, addr);
 232         if (!orig_node)
 233                 return NULL;
 234
 235         spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
 236
 237         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 238         orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
 239         if (!orig_node->bat_iv.bcast_own)
 240                 goto free_orig_node;
 241
 242         size = bat_priv->num_ifaces * sizeof(uint8_t);
 243         orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 244         if (!orig_node->bat_iv.bcast_own_sum)
 245                 goto free_orig_node;
 246
 247         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 248                                      batadv_choose_orig, orig_node,
 249                                      &orig_node->hash_entry);
 250         if (hash_added != 0)
 251                 goto free_orig_node;
 252
 253         return orig_node;
 254
 255 free_orig_node:
 256         /* free twice, as batadv_orig_node_new sets refcount to 2 */
 257         batadv_orig_node_free_ref(orig_node);
 258         batadv_orig_node_free_ref(orig_node);
 259
 260         return NULL;
 261 }
 262
 263 static struct batadv_neigh_node *
 264 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
 265                         const uint8_t *neigh_addr,
 266                         struct batadv_orig_node *orig_node,
 267                         struct batadv_orig_node *orig_neigh)
 268 {
 269         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 270         struct batadv_neigh_node *neigh_node, *tmp_neigh_node;
 271
 272         neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node);
 273         if (!neigh_node)
 274                 goto out;
 275
 276         if (!atomic_inc_not_zero(&hard_iface->refcount)) {
 277                 kfree(neigh_node);
 278                 neigh_node = NULL;
 279                 goto out;
 280         }
 281
 282         neigh_node->orig_node = orig_neigh;
 283         neigh_node->if_incoming = hard_iface;
 284
 285         spin_lock_bh(&orig_node->neigh_list_lock);
 286         tmp_neigh_node = batadv_neigh_node_get(orig_node, hard_iface,
 287                                                neigh_addr);
 288         if (!tmp_neigh_node) {
 289                 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
 290         } else {
 291                 kfree(neigh_node);
 292                 batadv_hardif_free_ref(hard_iface);
 293                 neigh_node = tmp_neigh_node;
 294         }
 295         spin_unlock_bh(&orig_node->neigh_list_lock);
 296
 297         if (!tmp_neigh_node)
 298                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 299                            "Creating new neighbor %pM for orig_node %pM on interface %s\n",
 300                            neigh_addr, orig_node->orig,
 301                            hard_iface->net_dev->name);
 302
 303 out:
 304         return neigh_node;
 305 }
 306
 307 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
 308 {
 309         struct batadv_ogm_packet *batadv_ogm_packet;
 310         unsigned char *ogm_buff;
 311         uint32_t random_seqno;
 312         int res = -ENOMEM;
 313
 314         /* randomize initial seqno to avoid collision */
 315         get_random_bytes(&random_seqno, sizeof(random_seqno));
 316         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 317
 318         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 319         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 320         if (!ogm_buff)
 321                 goto out;
 322
 323         hard_iface->bat_iv.ogm_buff = ogm_buff;
 324
 325         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 326         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 327         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 328         batadv_ogm_packet->ttl = 2;
 329         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 330         batadv_ogm_packet->reserved = 0;
 331         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 332
 333         res = 0;
 334
 335 out:
 336         return res;
 337 }
 338
 339 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 340 {
 341         kfree(hard_iface->bat_iv.ogm_buff);
 342         hard_iface->bat_iv.ogm_buff = NULL;
 343 }
 344
 345 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 346 {
 347         struct batadv_ogm_packet *batadv_ogm_packet;
 348         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 349
 350         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 351         ether_addr_copy(batadv_ogm_packet->orig,
 352                         hard_iface->net_dev->dev_addr);
 353         ether_addr_copy(batadv_ogm_packet->prev_sender,
 354                         hard_iface->net_dev->dev_addr);
 355 }
 356
 357 static void
 358 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 359 {
 360         struct batadv_ogm_packet *batadv_ogm_packet;
 361         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 362
 363         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 364         batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
 365         batadv_ogm_packet->ttl = BATADV_TTL;
 366 }
 367
 368 /* when do we schedule our own ogm to be sent */
 369 static unsigned long
 370 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 371 {
 372         unsigned int msecs;
 373
 374         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 375         msecs += prandom_u32() % (2 * BATADV_JITTER);
 376
 377         return jiffies + msecs_to_jiffies(msecs);
 378 }
 379
 380 /* when do we schedule a ogm packet to be sent */
 381 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 382 {
 383         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 384 }
 385
 386 /* apply hop penalty for a normal link */
 387 static uint8_t batadv_hop_penalty(uint8_t tq,
 388                                   const struct batadv_priv *bat_priv)
 389 {
 390         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 391         int new_tq;
 392
 393         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 394         new_tq /= BATADV_TQ_MAX_VALUE;
 395
 396         return new_tq;
 397 }
 398
 399 /* is there another aggregated packet here? */
 400 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 401                                      __be16 tvlv_len)
 402 {
 403         int next_buff_pos = 0;
 404
 405         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 406         next_buff_pos += ntohs(tvlv_len);
 407
 408         return (next_buff_pos <= packet_len) &&
 409                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 410 }
 411
 412 /* send a batman ogm to a given interface */
 413 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 414                                      struct batadv_hard_iface *hard_iface)
 415 {
 416         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 417         char *fwd_str;
 418         uint8_t packet_num;
 419         int16_t buff_pos;
 420         struct batadv_ogm_packet *batadv_ogm_packet;
 421         struct sk_buff *skb;
 422         uint8_t *packet_pos;
 423
 424         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 425                 return;
 426
 427         packet_num = 0;
 428         buff_pos = 0;
 429         packet_pos = forw_packet->skb->data;
 430         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 431
 432         /* adjust all flags and log packets */
 433         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 434                                          batadv_ogm_packet->tvlv_len)) {
 435                 /* we might have aggregated direct link packets with an
 436                  * ordinary base packet
 437                  */
 438                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 439                     forw_packet->if_incoming == hard_iface)
 440                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 441                 else
 442                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 443
 444                 if (packet_num > 0 || !forw_packet->own)
 445                         fwd_str = "Forwarding";
 446                 else
 447                         fwd_str = "Sending own";
 448
 449                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 450                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 451                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 452                            batadv_ogm_packet->orig,
 453                            ntohl(batadv_ogm_packet->seqno),
 454                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 455                            (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
 456                             "on" : "off"),
 457                            hard_iface->net_dev->name,
 458                            hard_iface->net_dev->dev_addr);
 459
 460                 buff_pos += BATADV_OGM_HLEN;
 461                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 462                 packet_num++;
 463                 packet_pos = forw_packet->skb->data + buff_pos;
 464                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 465         }
 466
 467         /* create clone because function is called more than once */
 468         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 469         if (skb) {
 470                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 471                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 472                                    skb->len + ETH_HLEN);
 473                 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 474         }
 475 }
 476
 477 /* send a batman ogm packet */
 478 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 479 {
 480         struct net_device *soft_iface;
 481         struct batadv_priv *bat_priv;
 482         struct batadv_hard_iface *primary_if = NULL;
 483
 484         if (!forw_packet->if_incoming) {
 485                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 486                 goto out;
 487         }
 488
 489         soft_iface = forw_packet->if_incoming->soft_iface;
 490         bat_priv = netdev_priv(soft_iface);
 491
 492         if (WARN_ON(!forw_packet->if_outgoing))
 493                 goto out;
 494
 495         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 496                 goto out;
 497
 498         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 499                 goto out;
 500
 501         primary_if = batadv_primary_if_get_selected(bat_priv);
 502         if (!primary_if)
 503                 goto out;
 504
 505         /* only for one specific outgoing interface */
 506         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 507
 508 out:
 509         if (primary_if)
 510                 batadv_hardif_free_ref(primary_if);
 511 }
 512
 513 /**
 514  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 515  *  existing forward packet
 516  * @new_bat_ogm_packet: OGM packet to be aggregated
 517  * @bat_priv: the bat priv with all the soft interface information
 518  * @packet_len: (total) length of the OGM
 519  * @send_time: timestamp (jiffies) when the packet is to be sent
 520  * @direktlink: true if this is a direct link packet
 521  * @if_incoming: interface where the packet was received
 522  * @if_outgoing: interface for which the retransmission should be considered
 523  * @forw_packet: the forwarded packet which should be checked
 524  *
 525  * Returns true if new_packet can be aggregated with forw_packet
 526  */
 527 static bool
 528 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 529                             struct batadv_priv *bat_priv,
 530                             int packet_len, unsigned long send_time,
 531                             bool directlink,
 532                             const struct batadv_hard_iface *if_incoming,
 533                             const struct batadv_hard_iface *if_outgoing,
 534                             const struct batadv_forw_packet *forw_packet)
 535 {
 536         struct batadv_ogm_packet *batadv_ogm_packet;
 537         int aggregated_bytes = forw_packet->packet_len + packet_len;
 538         struct batadv_hard_iface *primary_if = NULL;
 539         bool res = false;
 540         unsigned long aggregation_end_time;
 541
 542         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 543         aggregation_end_time = send_time;
 544         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 545
 546         /* we can aggregate the current packet to this aggregated packet
 547          * if:
 548          *
 549          * - the send time is within our MAX_AGGREGATION_MS time
 550          * - the resulting packet wont be bigger than
 551          *   MAX_AGGREGATION_BYTES
 552          */
 553         if (time_before(send_time, forw_packet->send_time) &&
 554             time_after_eq(aggregation_end_time, forw_packet->send_time) &&
 555             (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
 556                 /* check aggregation compatibility
 557                  * -> direct link packets are broadcasted on
 558                  *    their interface only
 559                  * -> aggregate packet if the current packet is
 560                  *    a "global" packet as well as the base
 561                  *    packet
 562                  */
 563                 primary_if = batadv_primary_if_get_selected(bat_priv);
 564                 if (!primary_if)
 565                         goto out;
 566
 567                 /* packet is not leaving on the same interface. */
 568                 if (forw_packet->if_outgoing != if_outgoing)
 569                         goto out;
 570
 571                 /* packets without direct link flag and high TTL
 572                  * are flooded through the net
 573                  */
 574                 if ((!directlink) &&
 575                     (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
 576                     (batadv_ogm_packet->ttl != 1) &&
 577
 578                     /* own packets originating non-primary
 579                      * interfaces leave only that interface
 580                      */
 581                     ((!forw_packet->own) ||
 582                      (forw_packet->if_incoming == primary_if))) {
 583                         res = true;
 584                         goto out;
 585                 }
 586
 587                 /* if the incoming packet is sent via this one
 588                  * interface only - we still can aggregate
 589                  */
 590                 if ((directlink) &&
 591                     (new_bat_ogm_packet->ttl == 1) &&
 592                     (forw_packet->if_incoming == if_incoming) &&
 593
 594                     /* packets from direct neighbors or
 595                      * own secondary interface packets
 596                      * (= secondary interface packets in general)
 597                      */
 598                     (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 599                      (forw_packet->own &&
 600                       forw_packet->if_incoming != primary_if))) {
 601                         res = true;
 602                         goto out;
 603                 }
 604         }
 605
 606 out:
 607         if (primary_if)
 608                 batadv_hardif_free_ref(primary_if);
 609         return res;
 610 }
 611
 612 /**
 613  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
 614  *  packet to it.
 615  * @packet_buff: pointer to the OGM
 616  * @packet_len: (total) length of the OGM
 617  * @send_time: timestamp (jiffies) when the packet is to be sent
 618  * @direct_link: whether this OGM has direct link status
 619  * @if_incoming: interface where the packet was received
 620  * @if_outgoing: interface for which the retransmission should be considered
 621  * @own_packet: true if it is a self-generated ogm
 622  */
 623 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 624                                         int packet_len, unsigned long send_time,
 625                                         bool direct_link,
 626                                         struct batadv_hard_iface *if_incoming,
 627                                         struct batadv_hard_iface *if_outgoing,
 628                                         int own_packet)
 629 {
 630         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 631         struct batadv_forw_packet *forw_packet_aggr;
 632         unsigned char *skb_buff;
 633         unsigned int skb_size;
 634
 635         if (!atomic_inc_not_zero(&if_incoming->refcount))
 636                 return;
 637
 638         if (!atomic_inc_not_zero(&if_outgoing->refcount))
 639                 goto out_free_incoming;
 640
 641         /* own packet should always be scheduled */
 642         if (!own_packet) {
 643                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 644                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 645                                    "batman packet queue full\n");
 646                         goto out;
 647                 }
 648         }
 649
 650         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 651         if (!forw_packet_aggr) {
 652                 if (!own_packet)
 653                         atomic_inc(&bat_priv->batman_queue_left);
 654                 goto out;
 655         }
 656
 657         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 658             (packet_len < BATADV_MAX_AGGREGATION_BYTES))
 659                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 660         else
 661                 skb_size = packet_len;
 662
 663         skb_size += ETH_HLEN;
 664
 665         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 666         if (!forw_packet_aggr->skb) {
 667                 if (!own_packet)
 668                         atomic_inc(&bat_priv->batman_queue_left);
 669                 kfree(forw_packet_aggr);
 670                 goto out;
 671         }
 672         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 673         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 674
 675         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 676         forw_packet_aggr->packet_len = packet_len;
 677         memcpy(skb_buff, packet_buff, packet_len);
 678
 679         forw_packet_aggr->own = own_packet;
 680         forw_packet_aggr->if_incoming = if_incoming;
 681         forw_packet_aggr->if_outgoing = if_outgoing;
 682         forw_packet_aggr->num_packets = 0;
 683         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 684         forw_packet_aggr->send_time = send_time;
 685
 686         /* save packet direct link flag status */
 687         if (direct_link)
 688                 forw_packet_aggr->direct_link_flags |= 1;
 689
 690         /* add new packet to packet list */
 691         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 692         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 693         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 694
 695         /* start timer for this packet */
 696         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 697                           batadv_send_outstanding_bat_ogm_packet);
 698         queue_delayed_work(batadv_event_workqueue,
 699                            &forw_packet_aggr->delayed_work,
 700                            send_time - jiffies);
 701
 702         return;
 703 out:
 704         batadv_hardif_free_ref(if_outgoing);
 705 out_free_incoming:
 706         batadv_hardif_free_ref(if_incoming);
 707 }
 708
 709 /* aggregate a new packet into the existing ogm packet */
 710 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 711                                     const unsigned char *packet_buff,
 712                                     int packet_len, bool direct_link)
 713 {
 714         unsigned char *skb_buff;
 715         unsigned long new_direct_link_flag;
 716
 717         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 718         memcpy(skb_buff, packet_buff, packet_len);
 719         forw_packet_aggr->packet_len += packet_len;
 720         forw_packet_aggr->num_packets++;
 721
 722         /* save packet direct link flag status */
 723         if (direct_link) {
 724                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 725                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 726         }
 727 }
 728
 729 /**
 730  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 731  * @bat_priv: the bat priv with all the soft interface information
 732  * @packet_buff: pointer to the OGM
 733  * @packet_len: (total) length of the OGM
 734  * @if_incoming: interface where the packet was received
 735  * @if_outgoing: interface for which the retransmission should be considered
 736  * @own_packet: true if it is a self-generated ogm
 737  * @send_time: timestamp (jiffies) when the packet is to be sent
 738  */
 739 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 740                                     unsigned char *packet_buff,
 741                                     int packet_len,
 742                                     struct batadv_hard_iface *if_incoming,
 743                                     struct batadv_hard_iface *if_outgoing,
 744                                     int own_packet, unsigned long send_time)
 745 {
 746         /* _aggr -> pointer to the packet we want to aggregate with
 747          * _pos -> pointer to the position in the queue
 748          */
 749         struct batadv_forw_packet *forw_packet_aggr = NULL;
 750         struct batadv_forw_packet *forw_packet_pos = NULL;
 751         struct batadv_ogm_packet *batadv_ogm_packet;
 752         bool direct_link;
 753         unsigned long max_aggregation_jiffies;
 754
 755         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 756         direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
 757         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 758
 759         /* find position for the packet in the forward queue */
 760         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 761         /* own packets are not to be aggregated */
 762         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 763                 hlist_for_each_entry(forw_packet_pos,
 764                                      &bat_priv->forw_bat_list, list) {
 765                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 766                                                         bat_priv, packet_len,
 767                                                         send_time, direct_link,
 768                                                         if_incoming,
 769                                                         if_outgoing,
 770                                                         forw_packet_pos)) {
 771                                 forw_packet_aggr = forw_packet_pos;
 772                                 break;
 773                         }
 774                 }
 775         }
 776
 777         /* nothing to aggregate with - either aggregation disabled or no
 778          * suitable aggregation packet found
 779          */
 780         if (!forw_packet_aggr) {
 781                 /* the following section can run without the lock */
 782                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 783
 784                 /* if we could not aggregate this packet with one of the others
 785                  * we hold it back for a while, so that it might be aggregated
 786                  * later on
 787                  */
 788                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 789                         send_time += max_aggregation_jiffies;
 790
 791                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 792                                             send_time, direct_link,
 793                                             if_incoming, if_outgoing,
 794                                             own_packet);
 795         } else {
 796                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 797                                         packet_len, direct_link);
 798                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 799         }
 800 }
 801
 802 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 803                                   const struct ethhdr *ethhdr,
 804                                   struct batadv_ogm_packet *batadv_ogm_packet,
 805                                   bool is_single_hop_neigh,
 806                                   bool is_from_best_next_hop,
 807                                   struct batadv_hard_iface *if_incoming,
 808                                   struct batadv_hard_iface *if_outgoing)
 809 {
 810         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 811         uint16_t tvlv_len;
 812
 813         if (batadv_ogm_packet->ttl <= 1) {
 814                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 815                 return;
 816         }
 817
 818         if (!is_from_best_next_hop) {
 819                 /* Mark the forwarded packet when it is not coming from our
 820                  * best next hop. We still need to forward the packet for our
 821                  * neighbor link quality detection to work in case the packet
 822                  * originated from a single hop neighbor. Otherwise we can
 823                  * simply drop the ogm.
 824                  */
 825                 if (is_single_hop_neigh)
 826                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 827                 else
 828                         return;
 829         }
 830
 831         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 832
 833         batadv_ogm_packet->ttl--;
 834         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 835
 836         /* apply hop penalty */
 837         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 838                                                    bat_priv);
 839
 840         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 841                    "Forwarding packet: tq: %i, ttl: %i\n",
 842                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 843
 844         /* switch of primaries first hop flag when forwarding */
 845         batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
 846         if (is_single_hop_neigh)
 847                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 848         else
 849                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 850
 851         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 852                                 BATADV_OGM_HLEN + tvlv_len,
 853                                 if_incoming, if_outgoing, 0,
 854                                 batadv_iv_ogm_fwd_send_time());
 855 }
 856
 857 /**
 858  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 859  * the given interface
 860  * @hard_iface: the interface for which the windows have to be shifted
 861  */
 862 static void
 863 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 864 {
 865         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 866         struct batadv_hashtable *hash = bat_priv->orig_hash;
 867         struct hlist_head *head;
 868         struct batadv_orig_node *orig_node;
 869         unsigned long *word;
 870         uint32_t i;
 871         size_t word_index;
 872         uint8_t *w;
 873         int if_num;
 874
 875         for (i = 0; i < hash->size; i++) {
 876                 head = &hash->table[i];
 877
 878                 rcu_read_lock();
 879                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 880                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 881                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 882                         word = &(orig_node->bat_iv.bcast_own[word_index]);
 883
 884                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 885                         if_num = hard_iface->if_num;
 886                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 887                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 888                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 889                 }
 890                 rcu_read_unlock();
 891         }
 892 }
 893
 894 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 895 {
 896         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 897         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 898         struct batadv_ogm_packet *batadv_ogm_packet;
 899         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 900         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 901         uint32_t seqno;
 902         uint16_t tvlv_len = 0;
 903         unsigned long send_time;
 904
 905         primary_if = batadv_primary_if_get_selected(bat_priv);
 906
 907         if (hard_iface == primary_if) {
 908                 /* tt changes have to be committed before the tvlv data is
 909                  * appended as it may alter the tt tvlv container
 910                  */
 911                 batadv_tt_local_commit_changes(bat_priv);
 912                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 913                                                             ogm_buff_len,
 914                                                             BATADV_OGM_HLEN);
 915         }
 916
 917         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 918         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 919
 920         /* change sequence number to network order */
 921         seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 922         batadv_ogm_packet->seqno = htonl(seqno);
 923         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 924
 925         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 926
 927         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 928
 929         if (hard_iface != primary_if) {
 930                 /* OGMs from secondary interfaces are only scheduled on their
 931                  * respective interfaces.
 932                  */
 933                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 934                                         hard_iface, hard_iface, 1, send_time);
 935                 goto out;
 936         }
 937
 938         /* OGMs from primary interfaces are scheduled on all
 939          * interfaces.
 940          */
 941         rcu_read_lock();
 942         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 943                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 944                                 continue;
 945                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 946                                         *ogm_buff_len, hard_iface,
 947                                         tmp_hard_iface, 1, send_time);
 948         }
 949         rcu_read_unlock();
 950
 951 out:
 952         if (primary_if)
 953                 batadv_hardif_free_ref(primary_if);
 954 }
 955
 956 /**
 957  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
 958  *  originator
 959  * @bat_priv: the bat priv with all the soft interface information
 960  * @orig_node: the orig node who originally emitted the ogm packet
 961  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
 962  * @ethhdr: Ethernet header of the OGM
 963  * @batadv_ogm_packet: the ogm packet
 964  * @if_incoming: interface where the packet was received
 965  * @if_outgoing: interface for which the retransmission should be considered
 966  * @dup_status: the duplicate status of this ogm packet.
 967  */
 968 static void
 969 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 970                           struct batadv_orig_node *orig_node,
 971                           struct batadv_orig_ifinfo *orig_ifinfo,
 972                           const struct ethhdr *ethhdr,
 973                           const struct batadv_ogm_packet *batadv_ogm_packet,
 974                           struct batadv_hard_iface *if_incoming,
 975                           struct batadv_hard_iface *if_outgoing,
 976                           enum batadv_dup_status dup_status)
 977 {
 978         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
 979         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
 980         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 981         struct batadv_neigh_node *router = NULL;
 982         struct batadv_orig_node *orig_node_tmp;
 983         int if_num;
 984         uint8_t sum_orig, sum_neigh;
 985         uint8_t *neigh_addr;
 986         uint8_t tq_avg;
 987
 988         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 989                    "update_originator(): Searching and updating originator entry of received packet\n");
 990
 991         rcu_read_lock();
 992         hlist_for_each_entry_rcu(tmp_neigh_node,
 993                                  &orig_node->neigh_list, list) {
 994                 neigh_addr = tmp_neigh_node->addr;
 995                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 996                     tmp_neigh_node->if_incoming == if_incoming &&
 997                     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 998                         if (WARN(neigh_node, "too many matching neigh_nodes"))
 999                                 batadv_neigh_node_free_ref(neigh_node);
1000                         neigh_node = tmp_neigh_node;
1001                         continue;
1002                 }
1003
1004                 if (dup_status != BATADV_NO_DUP)
1005                         continue;
1006
1007                 /* only update the entry for this outgoing interface */
1008                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1009                                                        if_outgoing);
1010                 if (!neigh_ifinfo)
1011                         continue;
1012
1013                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1014                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1015                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1016                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1017                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1018                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1019
1020                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1021                 neigh_ifinfo = NULL;
1022         }
1023
1024         if (!neigh_node) {
1025                 struct batadv_orig_node *orig_tmp;
1026
1027                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1028                 if (!orig_tmp)
1029                         goto unlock;
1030
1031                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1032                                                      ethhdr->h_source,
1033                                                      orig_node, orig_tmp);
1034
1035                 batadv_orig_node_free_ref(orig_tmp);
1036                 if (!neigh_node)
1037                         goto unlock;
1038         } else
1039                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1040                            "Updating existing last-hop neighbor of originator\n");
1041
1042         rcu_read_unlock();
1043         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1044         if (!neigh_ifinfo)
1045                 goto out;
1046
1047         neigh_node->last_seen = jiffies;
1048
1049         spin_lock_bh(&neigh_node->ifinfo_lock);
1050         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1051                                &neigh_ifinfo->bat_iv.tq_index,
1052                                batadv_ogm_packet->tq);
1053         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1054         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1055         spin_unlock_bh(&neigh_node->ifinfo_lock);
1056
1057         if (dup_status == BATADV_NO_DUP) {
1058                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1059                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1060         }
1061
1062         /* if this neighbor already is our next hop there is nothing
1063          * to change
1064          */
1065         router = batadv_orig_router_get(orig_node, if_outgoing);
1066         if (router == neigh_node)
1067                 goto out;
1068
1069         if (router) {
1070                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1071                 if (!router_ifinfo)
1072                         goto out;
1073
1074                 /* if this neighbor does not offer a better TQ we won't
1075                  * consider it
1076                  */
1077                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1078                         goto out;
1079         }
1080
1081         /* if the TQ is the same and the link not more symmetric we
1082          * won't consider it either
1083          */
1084         if (router_ifinfo &&
1085             (neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg)) {
1086                 orig_node_tmp = router->orig_node;
1087                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1088                 if_num = router->if_incoming->if_num;
1089                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1090                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1091
1092                 orig_node_tmp = neigh_node->orig_node;
1093                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1094                 if_num = neigh_node->if_incoming->if_num;
1095                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1096                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1097
1098                 if (sum_orig >= sum_neigh)
1099                         goto out;
1100         }
1101
1102         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1103         goto out;
1104
1105 unlock:
1106         rcu_read_unlock();
1107 out:
1108         if (neigh_node)
1109                 batadv_neigh_node_free_ref(neigh_node);
1110         if (router)
1111                 batadv_neigh_node_free_ref(router);
1112         if (neigh_ifinfo)
1113                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1114         if (router_ifinfo)
1115                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1116 }
1117
1118 /**
1119  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1120  * @orig_node: the orig node who originally emitted the ogm packet
1121  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1122  * @batadv_ogm_packet: the ogm packet
1123  * @if_incoming: interface where the packet was received
1124  * @if_outgoing: interface for which the retransmission should be considered
1125  *
1126  * Returns 1 if the link can be considered bidirectional, 0 otherwise
1127  */
1128 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1129                                  struct batadv_orig_node *orig_neigh_node,
1130                                  struct batadv_ogm_packet *batadv_ogm_packet,
1131                                  struct batadv_hard_iface *if_incoming,
1132                                  struct batadv_hard_iface *if_outgoing)
1133 {
1134         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1135         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1136         struct batadv_neigh_ifinfo *neigh_ifinfo;
1137         uint8_t total_count;
1138         uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1139         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1140         int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
1141         unsigned int combined_tq;
1142         int tq_iface_penalty;
1143
1144         /* find corresponding one hop neighbor */
1145         rcu_read_lock();
1146         hlist_for_each_entry_rcu(tmp_neigh_node,
1147                                  &orig_neigh_node->neigh_list, list) {
1148                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1149                                         orig_neigh_node->orig))
1150                         continue;
1151
1152                 if (tmp_neigh_node->if_incoming != if_incoming)
1153                         continue;
1154
1155                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1156                         continue;
1157
1158                 neigh_node = tmp_neigh_node;
1159                 break;
1160         }
1161         rcu_read_unlock();
1162
1163         if (!neigh_node)
1164                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1165                                                      orig_neigh_node->orig,
1166                                                      orig_neigh_node,
1167                                                      orig_neigh_node);
1168
1169         if (!neigh_node)
1170                 goto out;
1171
1172         /* if orig_node is direct neighbor update neigh_node last_seen */
1173         if (orig_node == orig_neigh_node)
1174                 neigh_node->last_seen = jiffies;
1175
1176         orig_node->last_seen = jiffies;
1177
1178         /* find packet count of corresponding one hop neighbor */
1179         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1180         if_num = if_incoming->if_num;
1181         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1182         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1183         if (neigh_ifinfo) {
1184                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1185                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1186         } else {
1187                 neigh_rq_count = 0;
1188         }
1189         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1190
1191         /* pay attention to not get a value bigger than 100 % */
1192         if (orig_eq_count > neigh_rq_count)
1193                 total_count = neigh_rq_count;
1194         else
1195                 total_count = orig_eq_count;
1196
1197         /* if we have too few packets (too less data) we set tq_own to zero
1198          * if we receive too few packets it is not considered bidirectional
1199          */
1200         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1201             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1202                 tq_own = 0;
1203         else
1204                 /* neigh_node->real_packet_count is never zero as we
1205                  * only purge old information when getting new
1206                  * information
1207                  */
1208                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1209
1210         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1211          * affect the nearly-symmetric links only a little, but
1212          * punishes asymmetric links more.  This will give a value
1213          * between 0 and TQ_MAX_VALUE
1214          */
1215         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1216         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1217         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1218                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1219                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1220         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1221         inv_asym_penalty /= neigh_rq_max_cube;
1222         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1223
1224         /* penalize if the OGM is forwarded on the same interface. WiFi
1225          * interfaces and other half duplex devices suffer from throughput
1226          * drops as they can't send and receive at the same time.
1227          */
1228         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1229         if (if_outgoing && (if_incoming == if_outgoing) &&
1230             batadv_is_wifi_netdev(if_outgoing->net_dev))
1231                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1232                                                       bat_priv);
1233
1234         combined_tq = batadv_ogm_packet->tq *
1235                       tq_own *
1236                       tq_asym_penalty *
1237                       tq_iface_penalty;
1238         combined_tq /= BATADV_TQ_MAX_VALUE *
1239                        BATADV_TQ_MAX_VALUE *
1240                        BATADV_TQ_MAX_VALUE;
1241         batadv_ogm_packet->tq = combined_tq;
1242
1243         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1244                    "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n",
1245                    orig_node->orig, orig_neigh_node->orig, total_count,
1246                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1247                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1248                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1249
1250         /* if link has the minimum required transmission quality
1251          * consider it bidirectional
1252          */
1253         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1254                 ret = 1;
1255
1256 out:
1257         if (neigh_node)
1258                 batadv_neigh_node_free_ref(neigh_node);
1259         return ret;
1260 }
1261
1262 /**
1263  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1264  *  adjust the sequence number and find out whether it is a duplicate
1265  * @ethhdr: ethernet header of the packet
1266  * @batadv_ogm_packet: OGM packet to be considered
1267  * @if_incoming: interface on which the OGM packet was received
1268  * @if_outgoing: interface for which the retransmission should be considered
1269  *
1270  * Returns duplicate status as enum batadv_dup_status
1271  */
1272 static enum batadv_dup_status
1273 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1274                             const struct batadv_ogm_packet *batadv_ogm_packet,
1275                             const struct batadv_hard_iface *if_incoming,
1276                             struct batadv_hard_iface *if_outgoing)
1277 {
1278         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1279         struct batadv_orig_node *orig_node;
1280         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1281         struct batadv_neigh_node *neigh_node;
1282         struct batadv_neigh_ifinfo *neigh_ifinfo;
1283         int is_dup;
1284         int32_t seq_diff;
1285         int need_update = 0;
1286         int set_mark;
1287         enum batadv_dup_status ret = BATADV_NO_DUP;
1288         uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
1289         uint8_t *neigh_addr;
1290         uint8_t packet_count;
1291         unsigned long *bitmap;
1292
1293         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1294         if (!orig_node)
1295                 return BATADV_NO_DUP;
1296
1297         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1298         if (WARN_ON(!orig_ifinfo)) {
1299                 batadv_orig_node_free_ref(orig_node);
1300                 return 0;
1301         }
1302
1303         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1304         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1305
1306         /* signalize caller that the packet is to be dropped. */
1307         if (!hlist_empty(&orig_node->neigh_list) &&
1308             batadv_window_protected(bat_priv, seq_diff,
1309                                     &orig_ifinfo->batman_seqno_reset)) {
1310                 ret = BATADV_PROTECTED;
1311                 goto out;
1312         }
1313
1314         rcu_read_lock();
1315         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1316                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1317                                                        if_outgoing);
1318                 if (!neigh_ifinfo)
1319                         continue;
1320
1321                 neigh_addr = neigh_node->addr;
1322                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1323                                          orig_ifinfo->last_real_seqno,
1324                                          seqno);
1325
1326                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1327                     neigh_node->if_incoming == if_incoming) {
1328                         set_mark = 1;
1329                         if (is_dup)
1330                                 ret = BATADV_NEIGH_DUP;
1331                 } else {
1332                         set_mark = 0;
1333                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1334                                 ret = BATADV_ORIG_DUP;
1335                 }
1336
1337                 /* if the window moved, set the update flag. */
1338                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1339                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1340                                                      seq_diff, set_mark);
1341
1342                 packet_count = bitmap_weight(bitmap,
1343                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1344                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1345                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1346         }
1347         rcu_read_unlock();
1348
1349         if (need_update) {
1350                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1351                            "%s updating last_seqno: old %u, new %u\n",
1352                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1353                            orig_ifinfo->last_real_seqno, seqno);
1354                 orig_ifinfo->last_real_seqno = seqno;
1355         }
1356
1357 out:
1358         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1359         batadv_orig_node_free_ref(orig_node);
1360         if (orig_ifinfo)
1361                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
1362         return ret;
1363 }
1364
1365
1366 /**
1367  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1368  * @skb: the skb containing the OGM
1369  * @orig_node: the (cached) orig node for the originator of this OGM
1370  * @if_incoming: the interface where this packet was received
1371  * @if_outgoing: the interface for which the packet should be considered
1372  */
1373 static void
1374 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1375                                 struct batadv_orig_node *orig_node,
1376                                 struct batadv_hard_iface *if_incoming,
1377                                 struct batadv_hard_iface *if_outgoing)
1378 {
1379         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1380         struct batadv_neigh_node *router = NULL, *router_router = NULL;
1381         struct batadv_orig_node *orig_neigh_node;
1382         struct batadv_orig_ifinfo *orig_ifinfo;
1383         struct batadv_neigh_node *orig_neigh_router = NULL;
1384         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1385         struct batadv_ogm_packet *ogm_packet;
1386         enum batadv_dup_status dup_status;
1387         bool is_from_best_next_hop = false;
1388         bool is_single_hop_neigh = false;
1389         bool sameseq, similar_ttl;
1390         struct sk_buff *skb_priv;
1391         struct ethhdr *ethhdr;
1392         uint8_t *prev_sender;
1393         int is_bidirect;
1394
1395         /* create a private copy of the skb, as some functions change tq value
1396          * and/or flags.
1397          */
1398         skb_priv = skb_copy(skb, GFP_ATOMIC);
1399         if (!skb_priv)
1400                 return;
1401
1402         ethhdr = eth_hdr(skb_priv);
1403         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1404
1405         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1406                                                  if_incoming, if_outgoing);
1407         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1408                 is_single_hop_neigh = true;
1409
1410         if (dup_status == BATADV_PROTECTED) {
1411                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1412                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1413                            ethhdr->h_source);
1414                 goto out;
1415         }
1416
1417         if (ogm_packet->tq == 0) {
1418                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1419                            "Drop packet: originator packet with tq equal 0\n");
1420                 goto out;
1421         }
1422
1423         router = batadv_orig_router_get(orig_node, if_outgoing);
1424         if (router) {
1425                 router_router = batadv_orig_router_get(router->orig_node,
1426                                                        if_outgoing);
1427                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1428         }
1429
1430         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1431             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1432                 is_from_best_next_hop = true;
1433
1434         prev_sender = ogm_packet->prev_sender;
1435         /* avoid temporary routing loops */
1436         if (router && router_router &&
1437             (batadv_compare_eth(router->addr, prev_sender)) &&
1438             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1439             (batadv_compare_eth(router->addr, router_router->addr))) {
1440                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1441                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1442                            ethhdr->h_source);
1443                 goto out;
1444         }
1445
1446         if (if_outgoing == BATADV_IF_DEFAULT)
1447                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1448
1449         /* if sender is a direct neighbor the sender mac equals
1450          * originator mac
1451          */
1452         if (is_single_hop_neigh)
1453                 orig_neigh_node = orig_node;
1454         else
1455                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1456                                                          ethhdr->h_source);
1457
1458         if (!orig_neigh_node)
1459                 goto out;
1460
1461         /* Update nc_nodes of the originator */
1462         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1463                                  ogm_packet, is_single_hop_neigh);
1464
1465         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1466                                                    if_outgoing);
1467
1468         /* drop packet if sender is not a direct neighbor and if we
1469          * don't route towards it
1470          */
1471         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1472                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1473                            "Drop packet: OGM via unknown neighbor!\n");
1474                 goto out_neigh;
1475         }
1476
1477         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1478                                             ogm_packet, if_incoming,
1479                                             if_outgoing);
1480
1481         /* update ranking if it is not a duplicate or has the same
1482          * seqno and similar ttl as the non-duplicate
1483          */
1484         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1485         if (!orig_ifinfo)
1486                 goto out_neigh;
1487
1488         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1489         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1490
1491         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1492                             (sameseq && similar_ttl))) {
1493                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1494                                           orig_ifinfo, ethhdr,
1495                                           ogm_packet, if_incoming,
1496                                           if_outgoing, dup_status);
1497         }
1498         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1499
1500         /* only forward for specific interface, not for the default one. */
1501         if (if_outgoing == BATADV_IF_DEFAULT)
1502                 goto out_neigh;
1503
1504         /* is single hop (direct) neighbor */
1505         if (is_single_hop_neigh) {
1506                 /* OGMs from secondary interfaces should only scheduled once
1507                  * per interface where it has been received, not multiple times
1508                  */
1509                 if ((ogm_packet->ttl <= 2) &&
1510                     (if_incoming != if_outgoing)) {
1511                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1512                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1513                         goto out_neigh;
1514                 }
1515                 /* mark direct link on incoming interface */
1516                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1517                                       is_single_hop_neigh,
1518                                       is_from_best_next_hop, if_incoming,
1519                                       if_outgoing);
1520
1521                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1522                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1523                 goto out_neigh;
1524         }
1525
1526         /* multihop originator */
1527         if (!is_bidirect) {
1528                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1529                            "Drop packet: not received via bidirectional link\n");
1530                 goto out_neigh;
1531         }
1532
1533         if (dup_status == BATADV_NEIGH_DUP) {
1534                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1535                            "Drop packet: duplicate packet received\n");
1536                 goto out_neigh;
1537         }
1538
1539         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1540                    "Forwarding packet: rebroadcast originator packet\n");
1541         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1542                               is_single_hop_neigh, is_from_best_next_hop,
1543                               if_incoming, if_outgoing);
1544
1545 out_neigh:
1546         if ((orig_neigh_node) && (!is_single_hop_neigh))
1547                 batadv_orig_node_free_ref(orig_neigh_node);
1548 out:
1549         if (router_ifinfo)
1550                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1551         if (router)
1552                 batadv_neigh_node_free_ref(router);
1553         if (router_router)
1554                 batadv_neigh_node_free_ref(router_router);
1555         if (orig_neigh_router)
1556                 batadv_neigh_node_free_ref(orig_neigh_router);
1557
1558         kfree_skb(skb_priv);
1559 }
1560
1561 /**
1562  * batadv_iv_ogm_process - process an incoming batman iv OGM
1563  * @skb: the skb containing the OGM
1564  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1565  * @if_incoming: the interface where this packet was receved
1566  */
1567 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1568                                   struct batadv_hard_iface *if_incoming)
1569 {
1570         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1571         struct batadv_orig_node *orig_neigh_node, *orig_node;
1572         struct batadv_hard_iface *hard_iface;
1573         struct batadv_ogm_packet *ogm_packet;
1574         uint32_t if_incoming_seqno;
1575         bool has_directlink_flag;
1576         struct ethhdr *ethhdr;
1577         bool is_my_oldorig = false;
1578         bool is_my_addr = false;
1579         bool is_my_orig = false;
1580
1581         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1582         ethhdr = eth_hdr(skb);
1583
1584         /* Silently drop when the batman packet is actually not a
1585          * correct packet.
1586          *
1587          * This might happen if a packet is padded (e.g. Ethernet has a
1588          * minimum frame length of 64 byte) and the aggregation interprets
1589          * it as an additional length.
1590          *
1591          * TODO: A more sane solution would be to have a bit in the
1592          * batadv_ogm_packet to detect whether the packet is the last
1593          * packet in an aggregation.  Here we expect that the padding
1594          * is always zero (or not 0x01)
1595          */
1596         if (ogm_packet->packet_type != BATADV_IV_OGM)
1597                 return;
1598
1599         /* could be changed by schedule_own_packet() */
1600         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1601
1602         if (ogm_packet->flags & BATADV_DIRECTLINK)
1603                 has_directlink_flag = true;
1604         else
1605                 has_directlink_flag = false;
1606
1607         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1608                    "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",
1609                    ethhdr->h_source, if_incoming->net_dev->name,
1610                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1611                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1612                    ogm_packet->tq, ogm_packet->ttl,
1613                    ogm_packet->version, has_directlink_flag);
1614
1615         rcu_read_lock();
1616         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1617                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1618                         continue;
1619
1620                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1621                         continue;
1622
1623                 if (batadv_compare_eth(ethhdr->h_source,
1624                                        hard_iface->net_dev->dev_addr))
1625                         is_my_addr = true;
1626
1627                 if (batadv_compare_eth(ogm_packet->orig,
1628                                        hard_iface->net_dev->dev_addr))
1629                         is_my_orig = true;
1630
1631                 if (batadv_compare_eth(ogm_packet->prev_sender,
1632                                        hard_iface->net_dev->dev_addr))
1633                         is_my_oldorig = true;
1634         }
1635         rcu_read_unlock();
1636
1637         if (is_my_addr) {
1638                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1639                            "Drop packet: received my own broadcast (sender: %pM)\n",
1640                            ethhdr->h_source);
1641                 return;
1642         }
1643
1644         if (is_my_orig) {
1645                 unsigned long *word;
1646                 int offset;
1647                 int32_t bit_pos;
1648                 int16_t if_num;
1649                 uint8_t *weight;
1650
1651                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1652                                                          ethhdr->h_source);
1653                 if (!orig_neigh_node)
1654                         return;
1655
1656                 /* neighbor has to indicate direct link and it has to
1657                  * come via the corresponding interface
1658                  * save packet seqno for bidirectional check
1659                  */
1660                 if (has_directlink_flag &&
1661                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1662                                        ogm_packet->orig)) {
1663                         if_num = if_incoming->if_num;
1664                         offset = if_num * BATADV_NUM_WORDS;
1665
1666                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1667                         word = &(orig_neigh_node->bat_iv.bcast_own[offset]);
1668                         bit_pos = if_incoming_seqno - 2;
1669                         bit_pos -= ntohl(ogm_packet->seqno);
1670                         batadv_set_bit(word, bit_pos);
1671                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1672                         *weight = bitmap_weight(word,
1673                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1674                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1675                 }
1676
1677                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1678                            "Drop packet: originator packet from myself (via neighbor)\n");
1679                 batadv_orig_node_free_ref(orig_neigh_node);
1680                 return;
1681         }
1682
1683         if (is_my_oldorig) {
1684                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1685                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1686                            ethhdr->h_source);
1687                 return;
1688         }
1689
1690         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1691                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1692                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1693                            ethhdr->h_source);
1694                 return;
1695         }
1696
1697         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1698         if (!orig_node)
1699                 return;
1700
1701         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1702                                         if_incoming, BATADV_IF_DEFAULT);
1703
1704         rcu_read_lock();
1705         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1706                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1707                         continue;
1708
1709                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1710                         continue;
1711
1712                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1713                                                 if_incoming, hard_iface);
1714         }
1715         rcu_read_unlock();
1716
1717         batadv_orig_node_free_ref(orig_node);
1718 }
1719
1720 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1721                                  struct batadv_hard_iface *if_incoming)
1722 {
1723         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1724         struct batadv_ogm_packet *ogm_packet;
1725         uint8_t *packet_pos;
1726         int ogm_offset;
1727         bool ret;
1728
1729         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1730         if (!ret)
1731                 return NET_RX_DROP;
1732
1733         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1734          * that does not have B.A.T.M.A.N. IV enabled ?
1735          */
1736         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1737                 return NET_RX_DROP;
1738
1739         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1740         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1741                            skb->len + ETH_HLEN);
1742
1743         ogm_offset = 0;
1744         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1745
1746         /* unpack the aggregated packets and process them one by one */
1747         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1748                                          ogm_packet->tvlv_len)) {
1749                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1750
1751                 ogm_offset += BATADV_OGM_HLEN;
1752                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1753
1754                 packet_pos = skb->data + ogm_offset;
1755                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1756         }
1757
1758         kfree_skb(skb);
1759         return NET_RX_SUCCESS;
1760 }
1761
1762 /**
1763  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1764  * @orig_node: the orig_node for which the neighbors are printed
1765  * @if_outgoing: outgoing interface for these entries
1766  * @seq: debugfs table seq_file struct
1767  *
1768  * Must be called while holding an rcu lock.
1769  */
1770 static void
1771 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1772                                struct batadv_hard_iface *if_outgoing,
1773                                struct seq_file *seq)
1774 {
1775         struct batadv_neigh_node *neigh_node;
1776         struct batadv_neigh_ifinfo *n_ifinfo;
1777
1778         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1779                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1780                 if (!n_ifinfo)
1781                         continue;
1782
1783                 seq_printf(seq, " %pM (%3i)",
1784                            neigh_node->addr,
1785                            n_ifinfo->bat_iv.tq_avg);
1786
1787                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1788         }
1789 }
1790
1791 /**
1792  * batadv_iv_ogm_orig_print - print the originator table
1793  * @bat_priv: the bat priv with all the soft interface information
1794  * @seq: debugfs table seq_file struct
1795  * @if_outgoing: the outgoing interface for which this should be printed
1796  */
1797 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1798                                      struct seq_file *seq,
1799                                      struct batadv_hard_iface *if_outgoing)
1800 {
1801         struct batadv_neigh_node *neigh_node;
1802         struct batadv_hashtable *hash = bat_priv->orig_hash;
1803         int last_seen_msecs, last_seen_secs;
1804         struct batadv_orig_node *orig_node;
1805         struct batadv_neigh_ifinfo *n_ifinfo;
1806         unsigned long last_seen_jiffies;
1807         struct hlist_head *head;
1808         int batman_count = 0;
1809         uint32_t i;
1810
1811         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1812                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1813                    "Nexthop", "outgoingIF", "Potential nexthops");
1814
1815         for (i = 0; i < hash->size; i++) {
1816                 head = &hash->table[i];
1817
1818                 rcu_read_lock();
1819                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1820                         neigh_node = batadv_orig_router_get(orig_node,
1821                                                             if_outgoing);
1822                         if (!neigh_node)
1823                                 continue;
1824
1825                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1826                                                            if_outgoing);
1827                         if (!n_ifinfo)
1828                                 goto next;
1829
1830                         if (n_ifinfo->bat_iv.tq_avg == 0)
1831                                 goto next;
1832
1833                         last_seen_jiffies = jiffies - orig_node->last_seen;
1834                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1835                         last_seen_secs = last_seen_msecs / 1000;
1836                         last_seen_msecs = last_seen_msecs % 1000;
1837
1838                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1839                                    orig_node->orig, last_seen_secs,
1840                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1841                                    neigh_node->addr,
1842                                    neigh_node->if_incoming->net_dev->name);
1843
1844                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1845                                                        seq);
1846                         seq_puts(seq, "\n");
1847                         batman_count++;
1848
1849 next:
1850                         batadv_neigh_node_free_ref(neigh_node);
1851                         if (n_ifinfo)
1852                                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1853                 }
1854                 rcu_read_unlock();
1855         }
1856
1857         if (batman_count == 0)
1858                 seq_puts(seq, "No batman nodes in range ...\n");
1859 }
1860
1861 /**
1862  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1863  * @neigh1: the first neighbor object of the comparison
1864  * @if_outgoing1: outgoing interface for the first neighbor
1865  * @neigh2: the second neighbor object of the comparison
1866  * @if_outgoing2: outgoing interface for the second neighbor
1867  *
1868  * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1869  * lower, the same as or higher than the metric via neigh2
1870  */
1871 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1872                                    struct batadv_hard_iface *if_outgoing1,
1873                                    struct batadv_neigh_node *neigh2,
1874                                    struct batadv_hard_iface *if_outgoing2)
1875 {
1876         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1877         uint8_t tq1, tq2;
1878         int diff;
1879
1880         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1881         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1882
1883         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1884                 diff = 0;
1885                 goto out;
1886         }
1887
1888         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1889         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1890         diff = tq1 - tq2;
1891
1892 out:
1893         if (neigh1_ifinfo)
1894                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1895         if (neigh2_ifinfo)
1896                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1897
1898         return diff;
1899 }
1900
1901 /**
1902  * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
1903  *  neigh2 from the metric prospective
1904  * @neigh1: the first neighbor object of the comparison
1905  * @if_outgoing: outgoing interface for the first neighbor
1906  * @neigh2: the second neighbor object of the comparison
1907  * @if_outgoing2: outgoing interface for the second neighbor
1908
1909  * Returns true if the metric via neigh1 is equally good or better than
1910  * the metric via neigh2, false otherwise.
1911  */
1912 static bool
1913 batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1,
1914                            struct batadv_hard_iface *if_outgoing1,
1915                            struct batadv_neigh_node *neigh2,
1916                            struct batadv_hard_iface *if_outgoing2)
1917 {
1918         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1919         uint8_t tq1, tq2;
1920         bool ret;
1921
1922         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1923         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1924
1925         /* we can't say that the metric is better */
1926         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1927                 ret = false;
1928                 goto out;
1929         }
1930
1931         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1932         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1933         ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
1934
1935 out:
1936         if (neigh1_ifinfo)
1937                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1938         if (neigh2_ifinfo)
1939                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1940
1941         return ret;
1942 }
1943
1944 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1945         .name = "BATMAN_IV",
1946         .bat_iface_enable = batadv_iv_ogm_iface_enable,
1947         .bat_iface_disable = batadv_iv_ogm_iface_disable,
1948         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1949         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1950         .bat_ogm_schedule = batadv_iv_ogm_schedule,
1951         .bat_ogm_emit = batadv_iv_ogm_emit,
1952         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
1953         .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
1954         .bat_orig_print = batadv_iv_ogm_orig_print,
1955         .bat_orig_free = batadv_iv_ogm_orig_free,
1956         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
1957         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
1958 };
1959
1960 int __init batadv_iv_init(void)
1961 {
1962         int ret;
1963
1964         /* batman originator packet */
1965         ret = batadv_recv_handler_register(BATADV_IV_OGM,
1966                                            batadv_iv_ogm_receive);
1967         if (ret < 0)
1968                 goto out;
1969
1970         ret = batadv_algo_register(&batadv_batman_iv);
1971         if (ret < 0)
1972                 goto handler_unregister;
1973
1974         goto out;
1975
1976 handler_unregister:
1977         batadv_recv_handler_unregister(BATADV_IV_OGM);
1978 out:
1979         return ret;
1980 }