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