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