kernel/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  * enum batadv_dup_status - duplicate status
  31  * @BATADV_NO_DUP: the packet is a duplicate
  32  * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
  33  *  neighbor)
  34  * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
  35  * @BATADV_PROTECTED: originator is currently protected (after reboot)
  36  */
  37 enum batadv_dup_status {
  38         BATADV_NO_DUP = 0,
  39         BATADV_ORIG_DUP,
  40         BATADV_NEIGH_DUP,
  41         BATADV_PROTECTED,
  42 };
  43
  44 /**
  45  * batadv_ring_buffer_set - update the ring buffer with the given value
  46  * @lq_recv: pointer to the ring buffer
  47  * @lq_index: index to store the value at
  48  * @value: value to store in the ring buffer
  49  */
  50 static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index,
  51                                    uint8_t value)
  52 {
  53         lq_recv[*lq_index] = value;
  54         *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
  55 }
  56
  57 /**
  58  * batadv_ring_buffer_set - compute the average of all non-zero values stored
  59  * in the given ring buffer
  60  * @lq_recv: pointer to the ring buffer
  61  *
  62  * Returns computed average value.
  63  */
  64 static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[])
  65 {
  66         const uint8_t *ptr;
  67         uint16_t count = 0, i = 0, sum = 0;
  68
  69         ptr = lq_recv;
  70
  71         while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
  72                 if (*ptr != 0) {
  73                         count++;
  74                         sum += *ptr;
  75                 }
  76
  77                 i++;
  78                 ptr++;
  79         }
  80
  81         if (count == 0)
  82                 return 0;
  83
  84         return (uint8_t)(sum / count);
  85 }
  86
  87 /**
  88  * batadv_iv_ogm_orig_free - free the private resources allocated for this
  89  *  orig_node
  90  * @orig_node: the orig_node for which the resources have to be free'd
  91  */
  92 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
  93 {
  94         kfree(orig_node->bat_iv.bcast_own);
  95         kfree(orig_node->bat_iv.bcast_own_sum);
  96 }
  97
  98 /**
  99  * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
 100  *  include the new hard-interface
 101  * @orig_node: the orig_node that has to be changed
 102  * @max_if_num: the current amount of interfaces
 103  *
 104  * Returns 0 on success, a negative error code otherwise.
 105  */
 106 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
 107                                      int max_if_num)
 108 {
 109         void *data_ptr;
 110         size_t old_size;
 111         int ret = -ENOMEM;
 112
 113         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 114
 115         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 116         data_ptr = kmalloc_array(max_if_num,
 117                                  BATADV_NUM_WORDS * sizeof(unsigned long),
 118                                  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_array(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_array(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_array(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_orig_node;
 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_orig_node;
 251
 252         return orig_node;
 253
 254 free_orig_node:
 255         /* free twice, as batadv_orig_node_new sets refcount to 2 */
 256         batadv_orig_node_free_ref(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, *tmp_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         spin_lock_bh(&orig_node->neigh_list_lock);
 285         tmp_neigh_node = batadv_neigh_node_get(orig_node, hard_iface,
 286                                                neigh_addr);
 287         if (!tmp_neigh_node) {
 288                 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
 289         } else {
 290                 kfree(neigh_node);
 291                 batadv_hardif_free_ref(hard_iface);
 292                 neigh_node = tmp_neigh_node;
 293         }
 294         spin_unlock_bh(&orig_node->neigh_list_lock);
 295
 296         if (!tmp_neigh_node)
 297                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 298                            "Creating new neighbor %pM for orig_node %pM on interface %s\n",
 299                            neigh_addr, orig_node->orig,
 300                            hard_iface->net_dev->name);
 301
 302 out:
 303         return neigh_node;
 304 }
 305
 306 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
 307 {
 308         struct batadv_ogm_packet *batadv_ogm_packet;
 309         unsigned char *ogm_buff;
 310         uint32_t random_seqno;
 311         int res = -ENOMEM;
 312
 313         /* randomize initial seqno to avoid collision */
 314         get_random_bytes(&random_seqno, sizeof(random_seqno));
 315         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 316
 317         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 318         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 319         if (!ogm_buff)
 320                 goto out;
 321
 322         hard_iface->bat_iv.ogm_buff = ogm_buff;
 323
 324         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 325         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 326         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 327         batadv_ogm_packet->ttl = 2;
 328         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 329         batadv_ogm_packet->reserved = 0;
 330         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 331
 332         res = 0;
 333
 334 out:
 335         return res;
 336 }
 337
 338 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 339 {
 340         kfree(hard_iface->bat_iv.ogm_buff);
 341         hard_iface->bat_iv.ogm_buff = NULL;
 342 }
 343
 344 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 345 {
 346         struct batadv_ogm_packet *batadv_ogm_packet;
 347         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 348
 349         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 350         ether_addr_copy(batadv_ogm_packet->orig,
 351                         hard_iface->net_dev->dev_addr);
 352         ether_addr_copy(batadv_ogm_packet->prev_sender,
 353                         hard_iface->net_dev->dev_addr);
 354 }
 355
 356 static void
 357 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 358 {
 359         struct batadv_ogm_packet *batadv_ogm_packet;
 360         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 361
 362         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 363         batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
 364         batadv_ogm_packet->ttl = BATADV_TTL;
 365 }
 366
 367 /* when do we schedule our own ogm to be sent */
 368 static unsigned long
 369 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 370 {
 371         unsigned int msecs;
 372
 373         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 374         msecs += prandom_u32() % (2 * BATADV_JITTER);
 375
 376         return jiffies + msecs_to_jiffies(msecs);
 377 }
 378
 379 /* when do we schedule a ogm packet to be sent */
 380 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 381 {
 382         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 383 }
 384
 385 /* apply hop penalty for a normal link */
 386 static uint8_t batadv_hop_penalty(uint8_t tq,
 387                                   const struct batadv_priv *bat_priv)
 388 {
 389         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 390         int new_tq;
 391
 392         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 393         new_tq /= BATADV_TQ_MAX_VALUE;
 394
 395         return new_tq;
 396 }
 397
 398 /* is there another aggregated packet here? */
 399 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 400                                      __be16 tvlv_len)
 401 {
 402         int next_buff_pos = 0;
 403
 404         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 405         next_buff_pos += ntohs(tvlv_len);
 406
 407         return (next_buff_pos <= packet_len) &&
 408                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 409 }
 410
 411 /* send a batman ogm to a given interface */
 412 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 413                                      struct batadv_hard_iface *hard_iface)
 414 {
 415         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 416         char *fwd_str;
 417         uint8_t packet_num;
 418         int16_t buff_pos;
 419         struct batadv_ogm_packet *batadv_ogm_packet;
 420         struct sk_buff *skb;
 421         uint8_t *packet_pos;
 422
 423         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 424                 return;
 425
 426         packet_num = 0;
 427         buff_pos = 0;
 428         packet_pos = forw_packet->skb->data;
 429         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 430
 431         /* adjust all flags and log packets */
 432         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 433                                          batadv_ogm_packet->tvlv_len)) {
 434                 /* we might have aggregated direct link packets with an
 435                  * ordinary base packet
 436                  */
 437                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 438                     forw_packet->if_incoming == hard_iface)
 439                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 440                 else
 441                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 442
 443                 if (packet_num > 0 || !forw_packet->own)
 444                         fwd_str = "Forwarding";
 445                 else
 446                         fwd_str = "Sending own";
 447
 448                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 449                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 450                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 451                            batadv_ogm_packet->orig,
 452                            ntohl(batadv_ogm_packet->seqno),
 453                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 454                            (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
 455                             "on" : "off"),
 456                            hard_iface->net_dev->name,
 457                            hard_iface->net_dev->dev_addr);
 458
 459                 buff_pos += BATADV_OGM_HLEN;
 460                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 461                 packet_num++;
 462                 packet_pos = forw_packet->skb->data + buff_pos;
 463                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 464         }
 465
 466         /* create clone because function is called more than once */
 467         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 468         if (skb) {
 469                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 470                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 471                                    skb->len + ETH_HLEN);
 472                 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 473         }
 474 }
 475
 476 /* send a batman ogm packet */
 477 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 478 {
 479         struct net_device *soft_iface;
 480         struct batadv_priv *bat_priv;
 481         struct batadv_hard_iface *primary_if = NULL;
 482
 483         if (!forw_packet->if_incoming) {
 484                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 485                 goto out;
 486         }
 487
 488         soft_iface = forw_packet->if_incoming->soft_iface;
 489         bat_priv = netdev_priv(soft_iface);
 490
 491         if (WARN_ON(!forw_packet->if_outgoing))
 492                 goto out;
 493
 494         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 495                 goto out;
 496
 497         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 498                 goto out;
 499
 500         primary_if = batadv_primary_if_get_selected(bat_priv);
 501         if (!primary_if)
 502                 goto out;
 503
 504         /* only for one specific outgoing interface */
 505         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 506
 507 out:
 508         if (primary_if)
 509                 batadv_hardif_free_ref(primary_if);
 510 }
 511
 512 /**
 513  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 514  *  existing forward packet
 515  * @new_bat_ogm_packet: OGM packet to be aggregated
 516  * @bat_priv: the bat priv with all the soft interface information
 517  * @packet_len: (total) length of the OGM
 518  * @send_time: timestamp (jiffies) when the packet is to be sent
 519  * @directlink: true if this is a direct link packet
 520  * @if_incoming: interface where the packet was received
 521  * @if_outgoing: interface for which the retransmission should be considered
 522  * @forw_packet: the forwarded packet which should be checked
 523  *
 524  * Returns true if new_packet can be aggregated with forw_packet
 525  */
 526 static bool
 527 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 528                             struct batadv_priv *bat_priv,
 529                             int packet_len, unsigned long send_time,
 530                             bool directlink,
 531                             const struct batadv_hard_iface *if_incoming,
 532                             const struct batadv_hard_iface *if_outgoing,
 533                             const struct batadv_forw_packet *forw_packet)
 534 {
 535         struct batadv_ogm_packet *batadv_ogm_packet;
 536         int aggregated_bytes = forw_packet->packet_len + packet_len;
 537         struct batadv_hard_iface *primary_if = NULL;
 538         bool res = false;
 539         unsigned long aggregation_end_time;
 540
 541         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 542         aggregation_end_time = send_time;
 543         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 544
 545         /* we can aggregate the current packet to this aggregated packet
 546          * if:
 547          *
 548          * - the send time is within our MAX_AGGREGATION_MS time
 549          * - the resulting packet wont be bigger than
 550          *   MAX_AGGREGATION_BYTES
 551          */
 552         if (time_before(send_time, forw_packet->send_time) &&
 553             time_after_eq(aggregation_end_time, forw_packet->send_time) &&
 554             (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
 555                 /* check aggregation compatibility
 556                  * -> direct link packets are broadcasted on
 557                  *    their interface only
 558                  * -> aggregate packet if the current packet is
 559                  *    a "global" packet as well as the base
 560                  *    packet
 561                  */
 562                 primary_if = batadv_primary_if_get_selected(bat_priv);
 563                 if (!primary_if)
 564                         goto out;
 565
 566                 /* packet is not leaving on the same interface. */
 567                 if (forw_packet->if_outgoing != if_outgoing)
 568                         goto out;
 569
 570                 /* packets without direct link flag and high TTL
 571                  * are flooded through the net
 572                  */
 573                 if ((!directlink) &&
 574                     (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
 575                     (batadv_ogm_packet->ttl != 1) &&
 576
 577                     /* own packets originating non-primary
 578                      * interfaces leave only that interface
 579                      */
 580                     ((!forw_packet->own) ||
 581                      (forw_packet->if_incoming == primary_if))) {
 582                         res = true;
 583                         goto out;
 584                 }
 585
 586                 /* if the incoming packet is sent via this one
 587                  * interface only - we still can aggregate
 588                  */
 589                 if ((directlink) &&
 590                     (new_bat_ogm_packet->ttl == 1) &&
 591                     (forw_packet->if_incoming == if_incoming) &&
 592
 593                     /* packets from direct neighbors or
 594                      * own secondary interface packets
 595                      * (= secondary interface packets in general)
 596                      */
 597                     (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 598                      (forw_packet->own &&
 599                       forw_packet->if_incoming != primary_if))) {
 600                         res = true;
 601                         goto out;
 602                 }
 603         }
 604
 605 out:
 606         if (primary_if)
 607                 batadv_hardif_free_ref(primary_if);
 608         return res;
 609 }
 610
 611 /**
 612  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
 613  *  packet to it.
 614  * @packet_buff: pointer to the OGM
 615  * @packet_len: (total) length of the OGM
 616  * @send_time: timestamp (jiffies) when the packet is to be sent
 617  * @direct_link: whether this OGM has direct link status
 618  * @if_incoming: interface where the packet was received
 619  * @if_outgoing: interface for which the retransmission should be considered
 620  * @own_packet: true if it is a self-generated ogm
 621  */
 622 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 623                                         int packet_len, unsigned long send_time,
 624                                         bool direct_link,
 625                                         struct batadv_hard_iface *if_incoming,
 626                                         struct batadv_hard_iface *if_outgoing,
 627                                         int own_packet)
 628 {
 629         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 630         struct batadv_forw_packet *forw_packet_aggr;
 631         unsigned char *skb_buff;
 632         unsigned int skb_size;
 633
 634         if (!atomic_inc_not_zero(&if_incoming->refcount))
 635                 return;
 636
 637         if (!atomic_inc_not_zero(&if_outgoing->refcount))
 638                 goto out_free_incoming;
 639
 640         /* own packet should always be scheduled */
 641         if (!own_packet) {
 642                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 643                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 644                                    "batman packet queue full\n");
 645                         goto out;
 646                 }
 647         }
 648
 649         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 650         if (!forw_packet_aggr) {
 651                 if (!own_packet)
 652                         atomic_inc(&bat_priv->batman_queue_left);
 653                 goto out;
 654         }
 655
 656         if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 657             (packet_len < BATADV_MAX_AGGREGATION_BYTES))
 658                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 659         else
 660                 skb_size = packet_len;
 661
 662         skb_size += ETH_HLEN;
 663
 664         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 665         if (!forw_packet_aggr->skb) {
 666                 if (!own_packet)
 667                         atomic_inc(&bat_priv->batman_queue_left);
 668                 kfree(forw_packet_aggr);
 669                 goto out;
 670         }
 671         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 672         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 673
 674         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 675         forw_packet_aggr->packet_len = packet_len;
 676         memcpy(skb_buff, packet_buff, packet_len);
 677
 678         forw_packet_aggr->own = own_packet;
 679         forw_packet_aggr->if_incoming = if_incoming;
 680         forw_packet_aggr->if_outgoing = if_outgoing;
 681         forw_packet_aggr->num_packets = 0;
 682         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 683         forw_packet_aggr->send_time = send_time;
 684
 685         /* save packet direct link flag status */
 686         if (direct_link)
 687                 forw_packet_aggr->direct_link_flags |= 1;
 688
 689         /* add new packet to packet list */
 690         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 691         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 692         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 693
 694         /* start timer for this packet */
 695         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 696                           batadv_send_outstanding_bat_ogm_packet);
 697         queue_delayed_work(batadv_event_workqueue,
 698                            &forw_packet_aggr->delayed_work,
 699                            send_time - jiffies);
 700
 701         return;
 702 out:
 703         batadv_hardif_free_ref(if_outgoing);
 704 out_free_incoming:
 705         batadv_hardif_free_ref(if_incoming);
 706 }
 707
 708 /* aggregate a new packet into the existing ogm packet */
 709 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 710                                     const unsigned char *packet_buff,
 711                                     int packet_len, bool direct_link)
 712 {
 713         unsigned char *skb_buff;
 714         unsigned long new_direct_link_flag;
 715
 716         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 717         memcpy(skb_buff, packet_buff, packet_len);
 718         forw_packet_aggr->packet_len += packet_len;
 719         forw_packet_aggr->num_packets++;
 720
 721         /* save packet direct link flag status */
 722         if (direct_link) {
 723                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 724                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 725         }
 726 }
 727
 728 /**
 729  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 730  * @bat_priv: the bat priv with all the soft interface information
 731  * @packet_buff: pointer to the OGM
 732  * @packet_len: (total) length of the OGM
 733  * @if_incoming: interface where the packet was received
 734  * @if_outgoing: interface for which the retransmission should be considered
 735  * @own_packet: true if it is a self-generated ogm
 736  * @send_time: timestamp (jiffies) when the packet is to be sent
 737  */
 738 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 739                                     unsigned char *packet_buff,
 740                                     int packet_len,
 741                                     struct batadv_hard_iface *if_incoming,
 742                                     struct batadv_hard_iface *if_outgoing,
 743                                     int own_packet, unsigned long send_time)
 744 {
 745         /* _aggr -> pointer to the packet we want to aggregate with
 746          * _pos -> pointer to the position in the queue
 747          */
 748         struct batadv_forw_packet *forw_packet_aggr = NULL;
 749         struct batadv_forw_packet *forw_packet_pos = NULL;
 750         struct batadv_ogm_packet *batadv_ogm_packet;
 751         bool direct_link;
 752         unsigned long max_aggregation_jiffies;
 753
 754         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 755         direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
 756         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 757
 758         /* find position for the packet in the forward queue */
 759         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 760         /* own packets are not to be aggregated */
 761         if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 762                 hlist_for_each_entry(forw_packet_pos,
 763                                      &bat_priv->forw_bat_list, list) {
 764                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 765                                                         bat_priv, packet_len,
 766                                                         send_time, direct_link,
 767                                                         if_incoming,
 768                                                         if_outgoing,
 769                                                         forw_packet_pos)) {
 770                                 forw_packet_aggr = forw_packet_pos;
 771                                 break;
 772                         }
 773                 }
 774         }
 775
 776         /* nothing to aggregate with - either aggregation disabled or no
 777          * suitable aggregation packet found
 778          */
 779         if (!forw_packet_aggr) {
 780                 /* the following section can run without the lock */
 781                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 782
 783                 /* if we could not aggregate this packet with one of the others
 784                  * we hold it back for a while, so that it might be aggregated
 785                  * later on
 786                  */
 787                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 788                         send_time += max_aggregation_jiffies;
 789
 790                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 791                                             send_time, direct_link,
 792                                             if_incoming, if_outgoing,
 793                                             own_packet);
 794         } else {
 795                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 796                                         packet_len, direct_link);
 797                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 798         }
 799 }
 800
 801 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 802                                   const struct ethhdr *ethhdr,
 803                                   struct batadv_ogm_packet *batadv_ogm_packet,
 804                                   bool is_single_hop_neigh,
 805                                   bool is_from_best_next_hop,
 806                                   struct batadv_hard_iface *if_incoming,
 807                                   struct batadv_hard_iface *if_outgoing)
 808 {
 809         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 810         uint16_t tvlv_len;
 811
 812         if (batadv_ogm_packet->ttl <= 1) {
 813                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 814                 return;
 815         }
 816
 817         if (!is_from_best_next_hop) {
 818                 /* Mark the forwarded packet when it is not coming from our
 819                  * best next hop. We still need to forward the packet for our
 820                  * neighbor link quality detection to work in case the packet
 821                  * originated from a single hop neighbor. Otherwise we can
 822                  * simply drop the ogm.
 823                  */
 824                 if (is_single_hop_neigh)
 825                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 826                 else
 827                         return;
 828         }
 829
 830         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 831
 832         batadv_ogm_packet->ttl--;
 833         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 834
 835         /* apply hop penalty */
 836         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 837                                                    bat_priv);
 838
 839         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 840                    "Forwarding packet: tq: %i, ttl: %i\n",
 841                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 842
 843         /* switch of primaries first hop flag when forwarding */
 844         batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
 845         if (is_single_hop_neigh)
 846                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 847         else
 848                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 849
 850         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 851                                 BATADV_OGM_HLEN + tvlv_len,
 852                                 if_incoming, if_outgoing, 0,
 853                                 batadv_iv_ogm_fwd_send_time());
 854 }
 855
 856 /**
 857  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 858  * the given interface
 859  * @hard_iface: the interface for which the windows have to be shifted
 860  */
 861 static void
 862 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 863 {
 864         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 865         struct batadv_hashtable *hash = bat_priv->orig_hash;
 866         struct hlist_head *head;
 867         struct batadv_orig_node *orig_node;
 868         unsigned long *word;
 869         uint32_t i;
 870         size_t word_index;
 871         uint8_t *w;
 872         int if_num;
 873
 874         for (i = 0; i < hash->size; i++) {
 875                 head = &hash->table[i];
 876
 877                 rcu_read_lock();
 878                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 879                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 880                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 881                         word = &orig_node->bat_iv.bcast_own[word_index];
 882
 883                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 884                         if_num = hard_iface->if_num;
 885                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 886                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 887                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 888                 }
 889                 rcu_read_unlock();
 890         }
 891 }
 892
 893 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 894 {
 895         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 896         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 897         struct batadv_ogm_packet *batadv_ogm_packet;
 898         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 899         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 900         uint32_t seqno;
 901         uint16_t tvlv_len = 0;
 902         unsigned long send_time;
 903
 904         primary_if = batadv_primary_if_get_selected(bat_priv);
 905
 906         if (hard_iface == primary_if) {
 907                 /* tt changes have to be committed before the tvlv data is
 908                  * appended as it may alter the tt tvlv container
 909                  */
 910                 batadv_tt_local_commit_changes(bat_priv);
 911                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 912                                                             ogm_buff_len,
 913                                                             BATADV_OGM_HLEN);
 914         }
 915
 916         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 917         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 918
 919         /* change sequence number to network order */
 920         seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 921         batadv_ogm_packet->seqno = htonl(seqno);
 922         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 923
 924         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 925
 926         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 927
 928         if (hard_iface != primary_if) {
 929                 /* OGMs from secondary interfaces are only scheduled on their
 930                  * respective interfaces.
 931                  */
 932                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 933                                         hard_iface, hard_iface, 1, send_time);
 934                 goto out;
 935         }
 936
 937         /* OGMs from primary interfaces are scheduled on all
 938          * interfaces.
 939          */
 940         rcu_read_lock();
 941         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 942                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 943                                 continue;
 944                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 945                                         *ogm_buff_len, hard_iface,
 946                                         tmp_hard_iface, 1, send_time);
 947         }
 948         rcu_read_unlock();
 949
 950 out:
 951         if (primary_if)
 952                 batadv_hardif_free_ref(primary_if);
 953 }
 954
 955 /**
 956  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
 957  *  originator
 958  * @bat_priv: the bat priv with all the soft interface information
 959  * @orig_node: the orig node who originally emitted the ogm packet
 960  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
 961  * @ethhdr: Ethernet header of the OGM
 962  * @batadv_ogm_packet: the ogm packet
 963  * @if_incoming: interface where the packet was received
 964  * @if_outgoing: interface for which the retransmission should be considered
 965  * @dup_status: the duplicate status of this ogm packet.
 966  */
 967 static void
 968 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 969                           struct batadv_orig_node *orig_node,
 970                           struct batadv_orig_ifinfo *orig_ifinfo,
 971                           const struct ethhdr *ethhdr,
 972                           const struct batadv_ogm_packet *batadv_ogm_packet,
 973                           struct batadv_hard_iface *if_incoming,
 974                           struct batadv_hard_iface *if_outgoing,
 975                           enum batadv_dup_status dup_status)
 976 {
 977         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
 978         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
 979         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 980         struct batadv_neigh_node *router = NULL;
 981         struct batadv_orig_node *orig_node_tmp;
 982         int if_num;
 983         uint8_t sum_orig, sum_neigh;
 984         uint8_t *neigh_addr;
 985         uint8_t tq_avg;
 986
 987         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 988                    "update_originator(): Searching and updating originator entry of received packet\n");
 989
 990         rcu_read_lock();
 991         hlist_for_each_entry_rcu(tmp_neigh_node,
 992                                  &orig_node->neigh_list, list) {
 993                 neigh_addr = tmp_neigh_node->addr;
 994                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 995                     tmp_neigh_node->if_incoming == if_incoming &&
 996                     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 997                         if (WARN(neigh_node, "too many matching neigh_nodes"))
 998                                 batadv_neigh_node_free_ref(neigh_node);
 999                         neigh_node = tmp_neigh_node;
1000                         continue;
1001                 }
1002
1003                 if (dup_status != BATADV_NO_DUP)
1004                         continue;
1005
1006                 /* only update the entry for this outgoing interface */
1007                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1008                                                        if_outgoing);
1009                 if (!neigh_ifinfo)
1010                         continue;
1011
1012                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1013                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1014                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1015                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1016                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1017                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1018
1019                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1020                 neigh_ifinfo = NULL;
1021         }
1022
1023         if (!neigh_node) {
1024                 struct batadv_orig_node *orig_tmp;
1025
1026                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1027                 if (!orig_tmp)
1028                         goto unlock;
1029
1030                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1031                                                      ethhdr->h_source,
1032                                                      orig_node, orig_tmp);
1033
1034                 batadv_orig_node_free_ref(orig_tmp);
1035                 if (!neigh_node)
1036                         goto unlock;
1037         } else
1038                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1039                            "Updating existing last-hop neighbor of originator\n");
1040
1041         rcu_read_unlock();
1042         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1043         if (!neigh_ifinfo)
1044                 goto out;
1045
1046         neigh_node->last_seen = jiffies;
1047
1048         spin_lock_bh(&neigh_node->ifinfo_lock);
1049         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1050                                &neigh_ifinfo->bat_iv.tq_index,
1051                                batadv_ogm_packet->tq);
1052         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1053         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1054         spin_unlock_bh(&neigh_node->ifinfo_lock);
1055
1056         if (dup_status == BATADV_NO_DUP) {
1057                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1058                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1059         }
1060
1061         /* if this neighbor already is our next hop there is nothing
1062          * to change
1063          */
1064         router = batadv_orig_router_get(orig_node, if_outgoing);
1065         if (router == neigh_node)
1066                 goto out;
1067
1068         if (router) {
1069                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1070                 if (!router_ifinfo)
1071                         goto out;
1072
1073                 /* if this neighbor does not offer a better TQ we won't
1074                  * consider it
1075                  */
1076                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1077                         goto out;
1078         }
1079
1080         /* if the TQ is the same and the link not more symmetric we
1081          * won't consider it either
1082          */
1083         if (router_ifinfo &&
1084             (neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg)) {
1085                 orig_node_tmp = router->orig_node;
1086                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1087                 if_num = router->if_incoming->if_num;
1088                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1089                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1090
1091                 orig_node_tmp = neigh_node->orig_node;
1092                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1093                 if_num = neigh_node->if_incoming->if_num;
1094                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1095                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1096
1097                 if (sum_orig >= sum_neigh)
1098                         goto out;
1099         }
1100
1101         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1102         goto out;
1103
1104 unlock:
1105         rcu_read_unlock();
1106 out:
1107         if (neigh_node)
1108                 batadv_neigh_node_free_ref(neigh_node);
1109         if (router)
1110                 batadv_neigh_node_free_ref(router);
1111         if (neigh_ifinfo)
1112                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1113         if (router_ifinfo)
1114                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1115 }
1116
1117 /**
1118  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1119  * @orig_node: the orig node who originally emitted the ogm packet
1120  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1121  * @batadv_ogm_packet: the ogm packet
1122  * @if_incoming: interface where the packet was received
1123  * @if_outgoing: interface for which the retransmission should be considered
1124  *
1125  * Returns 1 if the link can be considered bidirectional, 0 otherwise
1126  */
1127 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1128                                  struct batadv_orig_node *orig_neigh_node,
1129                                  struct batadv_ogm_packet *batadv_ogm_packet,
1130                                  struct batadv_hard_iface *if_incoming,
1131                                  struct batadv_hard_iface *if_outgoing)
1132 {
1133         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1134         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1135         struct batadv_neigh_ifinfo *neigh_ifinfo;
1136         uint8_t total_count;
1137         uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1138         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1139         int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
1140         unsigned int combined_tq;
1141         int tq_iface_penalty;
1142
1143         /* find corresponding one hop neighbor */
1144         rcu_read_lock();
1145         hlist_for_each_entry_rcu(tmp_neigh_node,
1146                                  &orig_neigh_node->neigh_list, list) {
1147                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1148                                         orig_neigh_node->orig))
1149                         continue;
1150
1151                 if (tmp_neigh_node->if_incoming != if_incoming)
1152                         continue;
1153
1154                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1155                         continue;
1156
1157                 neigh_node = tmp_neigh_node;
1158                 break;
1159         }
1160         rcu_read_unlock();
1161
1162         if (!neigh_node)
1163                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1164                                                      orig_neigh_node->orig,
1165                                                      orig_neigh_node,
1166                                                      orig_neigh_node);
1167
1168         if (!neigh_node)
1169                 goto out;
1170
1171         /* if orig_node is direct neighbor update neigh_node last_seen */
1172         if (orig_node == orig_neigh_node)
1173                 neigh_node->last_seen = jiffies;
1174
1175         orig_node->last_seen = jiffies;
1176
1177         /* find packet count of corresponding one hop neighbor */
1178         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1179         if_num = if_incoming->if_num;
1180         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1181         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1182         if (neigh_ifinfo) {
1183                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1184                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1185         } else {
1186                 neigh_rq_count = 0;
1187         }
1188         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1189
1190         /* pay attention to not get a value bigger than 100 % */
1191         if (orig_eq_count > neigh_rq_count)
1192                 total_count = neigh_rq_count;
1193         else
1194                 total_count = orig_eq_count;
1195
1196         /* if we have too few packets (too less data) we set tq_own to zero
1197          * if we receive too few packets it is not considered bidirectional
1198          */
1199         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1200             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1201                 tq_own = 0;
1202         else
1203                 /* neigh_node->real_packet_count is never zero as we
1204                  * only purge old information when getting new
1205                  * information
1206                  */
1207                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1208
1209         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1210          * affect the nearly-symmetric links only a little, but
1211          * punishes asymmetric links more.  This will give a value
1212          * between 0 and TQ_MAX_VALUE
1213          */
1214         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1215         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1216         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1217                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1218                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1219         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1220         inv_asym_penalty /= neigh_rq_max_cube;
1221         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1222
1223         /* penalize if the OGM is forwarded on the same interface. WiFi
1224          * interfaces and other half duplex devices suffer from throughput
1225          * drops as they can't send and receive at the same time.
1226          */
1227         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1228         if (if_outgoing && (if_incoming == if_outgoing) &&
1229             batadv_is_wifi_netdev(if_outgoing->net_dev))
1230                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1231                                                       bat_priv);
1232
1233         combined_tq = batadv_ogm_packet->tq *
1234                       tq_own *
1235                       tq_asym_penalty *
1236                       tq_iface_penalty;
1237         combined_tq /= BATADV_TQ_MAX_VALUE *
1238                        BATADV_TQ_MAX_VALUE *
1239                        BATADV_TQ_MAX_VALUE;
1240         batadv_ogm_packet->tq = combined_tq;
1241
1242         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1243                    "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",
1244                    orig_node->orig, orig_neigh_node->orig, total_count,
1245                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1246                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1247                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1248
1249         /* if link has the minimum required transmission quality
1250          * consider it bidirectional
1251          */
1252         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1253                 ret = 1;
1254
1255 out:
1256         if (neigh_node)
1257                 batadv_neigh_node_free_ref(neigh_node);
1258         return ret;
1259 }
1260
1261 /**
1262  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1263  *  adjust the sequence number and find out whether it is a duplicate
1264  * @ethhdr: ethernet header of the packet
1265  * @batadv_ogm_packet: OGM packet to be considered
1266  * @if_incoming: interface on which the OGM packet was received
1267  * @if_outgoing: interface for which the retransmission should be considered
1268  *
1269  * Returns duplicate status as enum batadv_dup_status
1270  */
1271 static enum batadv_dup_status
1272 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1273                             const struct batadv_ogm_packet *batadv_ogm_packet,
1274                             const struct batadv_hard_iface *if_incoming,
1275                             struct batadv_hard_iface *if_outgoing)
1276 {
1277         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1278         struct batadv_orig_node *orig_node;
1279         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1280         struct batadv_neigh_node *neigh_node;
1281         struct batadv_neigh_ifinfo *neigh_ifinfo;
1282         int is_dup;
1283         int32_t seq_diff;
1284         int need_update = 0;
1285         int set_mark;
1286         enum batadv_dup_status ret = BATADV_NO_DUP;
1287         uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
1288         uint8_t *neigh_addr;
1289         uint8_t packet_count;
1290         unsigned long *bitmap;
1291
1292         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1293         if (!orig_node)
1294                 return BATADV_NO_DUP;
1295
1296         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1297         if (WARN_ON(!orig_ifinfo)) {
1298                 batadv_orig_node_free_ref(orig_node);
1299                 return 0;
1300         }
1301
1302         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1303         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1304
1305         /* signalize caller that the packet is to be dropped. */
1306         if (!hlist_empty(&orig_node->neigh_list) &&
1307             batadv_window_protected(bat_priv, seq_diff,
1308                                     &orig_ifinfo->batman_seqno_reset)) {
1309                 ret = BATADV_PROTECTED;
1310                 goto out;
1311         }
1312
1313         rcu_read_lock();
1314         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1315                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1316                                                        if_outgoing);
1317                 if (!neigh_ifinfo)
1318                         continue;
1319
1320                 neigh_addr = neigh_node->addr;
1321                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1322                                          orig_ifinfo->last_real_seqno,
1323                                          seqno);
1324
1325                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1326                     neigh_node->if_incoming == if_incoming) {
1327                         set_mark = 1;
1328                         if (is_dup)
1329                                 ret = BATADV_NEIGH_DUP;
1330                 } else {
1331                         set_mark = 0;
1332                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1333                                 ret = BATADV_ORIG_DUP;
1334                 }
1335
1336                 /* if the window moved, set the update flag. */
1337                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1338                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1339                                                      seq_diff, set_mark);
1340
1341                 packet_count = bitmap_weight(bitmap,
1342                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1343                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1344                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1345         }
1346         rcu_read_unlock();
1347
1348         if (need_update) {
1349                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1350                            "%s updating last_seqno: old %u, new %u\n",
1351                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1352                            orig_ifinfo->last_real_seqno, seqno);
1353                 orig_ifinfo->last_real_seqno = seqno;
1354         }
1355
1356 out:
1357         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1358         batadv_orig_node_free_ref(orig_node);
1359         if (orig_ifinfo)
1360                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
1361         return ret;
1362 }
1363
1364 /**
1365  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1366  * @skb: the skb containing the OGM
1367  * @ogm_offset: offset from skb->data to start of ogm header
1368  * @orig_node: the (cached) orig node for the originator of this OGM
1369  * @if_incoming: the interface where this packet was received
1370  * @if_outgoing: the interface for which the packet should be considered
1371  */
1372 static void
1373 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1374                                 struct batadv_orig_node *orig_node,
1375                                 struct batadv_hard_iface *if_incoming,
1376                                 struct batadv_hard_iface *if_outgoing)
1377 {
1378         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1379         struct batadv_neigh_node *router = NULL, *router_router = NULL;
1380         struct batadv_orig_node *orig_neigh_node;
1381         struct batadv_orig_ifinfo *orig_ifinfo;
1382         struct batadv_neigh_node *orig_neigh_router = NULL;
1383         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1384         struct batadv_ogm_packet *ogm_packet;
1385         enum batadv_dup_status dup_status;
1386         bool is_from_best_next_hop = false;
1387         bool is_single_hop_neigh = false;
1388         bool sameseq, similar_ttl;
1389         struct sk_buff *skb_priv;
1390         struct ethhdr *ethhdr;
1391         uint8_t *prev_sender;
1392         int is_bidirect;
1393
1394         /* create a private copy of the skb, as some functions change tq value
1395          * and/or flags.
1396          */
1397         skb_priv = skb_copy(skb, GFP_ATOMIC);
1398         if (!skb_priv)
1399                 return;
1400
1401         ethhdr = eth_hdr(skb_priv);
1402         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1403
1404         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1405                                                  if_incoming, if_outgoing);
1406         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1407                 is_single_hop_neigh = true;
1408
1409         if (dup_status == BATADV_PROTECTED) {
1410                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1411                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1412                            ethhdr->h_source);
1413                 goto out;
1414         }
1415
1416         if (ogm_packet->tq == 0) {
1417                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1418                            "Drop packet: originator packet with tq equal 0\n");
1419                 goto out;
1420         }
1421
1422         router = batadv_orig_router_get(orig_node, if_outgoing);
1423         if (router) {
1424                 router_router = batadv_orig_router_get(router->orig_node,
1425                                                        if_outgoing);
1426                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1427         }
1428
1429         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1430             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1431                 is_from_best_next_hop = true;
1432
1433         prev_sender = ogm_packet->prev_sender;
1434         /* avoid temporary routing loops */
1435         if (router && router_router &&
1436             (batadv_compare_eth(router->addr, prev_sender)) &&
1437             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1438             (batadv_compare_eth(router->addr, router_router->addr))) {
1439                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1440                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1441                            ethhdr->h_source);
1442                 goto out;
1443         }
1444
1445         if (if_outgoing == BATADV_IF_DEFAULT)
1446                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1447
1448         /* if sender is a direct neighbor the sender mac equals
1449          * originator mac
1450          */
1451         if (is_single_hop_neigh)
1452                 orig_neigh_node = orig_node;
1453         else
1454                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1455                                                          ethhdr->h_source);
1456
1457         if (!orig_neigh_node)
1458                 goto out;
1459
1460         /* Update nc_nodes of the originator */
1461         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1462                                  ogm_packet, is_single_hop_neigh);
1463
1464         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1465                                                    if_outgoing);
1466
1467         /* drop packet if sender is not a direct neighbor and if we
1468          * don't route towards it
1469          */
1470         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1471                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1472                            "Drop packet: OGM via unknown neighbor!\n");
1473                 goto out_neigh;
1474         }
1475
1476         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1477                                             ogm_packet, if_incoming,
1478                                             if_outgoing);
1479
1480         /* update ranking if it is not a duplicate or has the same
1481          * seqno and similar ttl as the non-duplicate
1482          */
1483         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1484         if (!orig_ifinfo)
1485                 goto out_neigh;
1486
1487         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1488         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1489
1490         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1491                             (sameseq && similar_ttl))) {
1492                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1493                                           orig_ifinfo, ethhdr,
1494                                           ogm_packet, if_incoming,
1495                                           if_outgoing, dup_status);
1496         }
1497         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1498
1499         /* only forward for specific interface, not for the default one. */
1500         if (if_outgoing == BATADV_IF_DEFAULT)
1501                 goto out_neigh;
1502
1503         /* is single hop (direct) neighbor */
1504         if (is_single_hop_neigh) {
1505                 /* OGMs from secondary interfaces should only scheduled once
1506                  * per interface where it has been received, not multiple times
1507                  */
1508                 if ((ogm_packet->ttl <= 2) &&
1509                     (if_incoming != if_outgoing)) {
1510                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1511                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1512                         goto out_neigh;
1513                 }
1514                 /* mark direct link on incoming interface */
1515                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1516                                       is_single_hop_neigh,
1517                                       is_from_best_next_hop, if_incoming,
1518                                       if_outgoing);
1519
1520                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1521                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1522                 goto out_neigh;
1523         }
1524
1525         /* multihop originator */
1526         if (!is_bidirect) {
1527                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1528                            "Drop packet: not received via bidirectional link\n");
1529                 goto out_neigh;
1530         }
1531
1532         if (dup_status == BATADV_NEIGH_DUP) {
1533                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1534                            "Drop packet: duplicate packet received\n");
1535                 goto out_neigh;
1536         }
1537
1538         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1539                    "Forwarding packet: rebroadcast originator packet\n");
1540         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1541                               is_single_hop_neigh, is_from_best_next_hop,
1542                               if_incoming, if_outgoing);
1543
1544 out_neigh:
1545         if ((orig_neigh_node) && (!is_single_hop_neigh))
1546                 batadv_orig_node_free_ref(orig_neigh_node);
1547 out:
1548         if (router_ifinfo)
1549                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
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_outgoing1: 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 }