net/batman-adv/bat_iv_ogm.c

   1 /* Copyright (C) 2007-2015 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
 312         /* randomize initial seqno to avoid collision */
 313         get_random_bytes(&random_seqno, sizeof(random_seqno));
 314         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 315
 316         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 317         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 318         if (!ogm_buff)
 319                 return -ENOMEM;
 320
 321         hard_iface->bat_iv.ogm_buff = ogm_buff;
 322
 323         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 324         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 325         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 326         batadv_ogm_packet->ttl = 2;
 327         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 328         batadv_ogm_packet->reserved = 0;
 329         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 330
 331         return 0;
 332 }
 333
 334 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 335 {
 336         kfree(hard_iface->bat_iv.ogm_buff);
 337         hard_iface->bat_iv.ogm_buff = NULL;
 338 }
 339
 340 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 341 {
 342         struct batadv_ogm_packet *batadv_ogm_packet;
 343         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 344
 345         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 346         ether_addr_copy(batadv_ogm_packet->orig,
 347                         hard_iface->net_dev->dev_addr);
 348         ether_addr_copy(batadv_ogm_packet->prev_sender,
 349                         hard_iface->net_dev->dev_addr);
 350 }
 351
 352 static void
 353 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 354 {
 355         struct batadv_ogm_packet *batadv_ogm_packet;
 356         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 357
 358         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 359         batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
 360         batadv_ogm_packet->ttl = BATADV_TTL;
 361 }
 362
 363 /* when do we schedule our own ogm to be sent */
 364 static unsigned long
 365 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 366 {
 367         unsigned int msecs;
 368
 369         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 370         msecs += prandom_u32() % (2 * BATADV_JITTER);
 371
 372         return jiffies + msecs_to_jiffies(msecs);
 373 }
 374
 375 /* when do we schedule a ogm packet to be sent */
 376 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 377 {
 378         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 379 }
 380
 381 /* apply hop penalty for a normal link */
 382 static uint8_t batadv_hop_penalty(uint8_t tq,
 383                                   const struct batadv_priv *bat_priv)
 384 {
 385         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 386         int new_tq;
 387
 388         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 389         new_tq /= BATADV_TQ_MAX_VALUE;
 390
 391         return new_tq;
 392 }
 393
 394 /* is there another aggregated packet here? */
 395 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 396                                       __be16 tvlv_len)
 397 {
 398         int next_buff_pos = 0;
 399
 400         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 401         next_buff_pos += ntohs(tvlv_len);
 402
 403         return (next_buff_pos <= packet_len) &&
 404                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 405 }
 406
 407 /* send a batman ogm to a given interface */
 408 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 409                                      struct batadv_hard_iface *hard_iface)
 410 {
 411         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 412         const char *fwd_str;
 413         uint8_t packet_num;
 414         int16_t buff_pos;
 415         struct batadv_ogm_packet *batadv_ogm_packet;
 416         struct sk_buff *skb;
 417         uint8_t *packet_pos;
 418
 419         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 420                 return;
 421
 422         packet_num = 0;
 423         buff_pos = 0;
 424         packet_pos = forw_packet->skb->data;
 425         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 426
 427         /* adjust all flags and log packets */
 428         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 429                                          batadv_ogm_packet->tvlv_len)) {
 430                 /* we might have aggregated direct link packets with an
 431                  * ordinary base packet
 432                  */
 433                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 434                     forw_packet->if_incoming == hard_iface)
 435                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 436                 else
 437                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 438
 439                 if (packet_num > 0 || !forw_packet->own)
 440                         fwd_str = "Forwarding";
 441                 else
 442                         fwd_str = "Sending own";
 443
 444                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 445                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 446                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 447                            batadv_ogm_packet->orig,
 448                            ntohl(batadv_ogm_packet->seqno),
 449                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 450                            (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
 451                             "on" : "off"),
 452                            hard_iface->net_dev->name,
 453                            hard_iface->net_dev->dev_addr);
 454
 455                 buff_pos += BATADV_OGM_HLEN;
 456                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 457                 packet_num++;
 458                 packet_pos = forw_packet->skb->data + buff_pos;
 459                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 460         }
 461
 462         /* create clone because function is called more than once */
 463         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 464         if (skb) {
 465                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 466                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 467                                    skb->len + ETH_HLEN);
 468                 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 469         }
 470 }
 471
 472 /* send a batman ogm packet */
 473 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 474 {
 475         struct net_device *soft_iface;
 476         struct batadv_priv *bat_priv;
 477         struct batadv_hard_iface *primary_if = NULL;
 478
 479         if (!forw_packet->if_incoming) {
 480                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 481                 goto out;
 482         }
 483
 484         soft_iface = forw_packet->if_incoming->soft_iface;
 485         bat_priv = netdev_priv(soft_iface);
 486
 487         if (WARN_ON(!forw_packet->if_outgoing))
 488                 goto out;
 489
 490         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 491                 goto out;
 492
 493         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 494                 goto out;
 495
 496         primary_if = batadv_primary_if_get_selected(bat_priv);
 497         if (!primary_if)
 498                 goto out;
 499
 500         /* only for one specific outgoing interface */
 501         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 502
 503 out:
 504         if (primary_if)
 505                 batadv_hardif_free_ref(primary_if);
 506 }
 507
 508 /**
 509  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 510  *  existing forward packet
 511  * @new_bat_ogm_packet: OGM packet to be aggregated
 512  * @bat_priv: the bat priv with all the soft interface information
 513  * @packet_len: (total) length of the OGM
 514  * @send_time: timestamp (jiffies) when the packet is to be sent
 515  * @directlink: true if this is a direct link packet
 516  * @if_incoming: interface where the packet was received
 517  * @if_outgoing: interface for which the retransmission should be considered
 518  * @forw_packet: the forwarded packet which should be checked
 519  *
 520  * Returns true if new_packet can be aggregated with forw_packet
 521  */
 522 static bool
 523 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 524                             struct batadv_priv *bat_priv,
 525                             int packet_len, unsigned long send_time,
 526                             bool directlink,
 527                             const struct batadv_hard_iface *if_incoming,
 528                             const struct batadv_hard_iface *if_outgoing,
 529                             const struct batadv_forw_packet *forw_packet)
 530 {
 531         struct batadv_ogm_packet *batadv_ogm_packet;
 532         int aggregated_bytes = forw_packet->packet_len + packet_len;
 533         struct batadv_hard_iface *primary_if = NULL;
 534         bool res = false;
 535         unsigned long aggregation_end_time;
 536
 537         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 538         aggregation_end_time = send_time;
 539         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 540
 541         /* we can aggregate the current packet to this aggregated packet
 542          * if:
 543          *
 544          * - the send time is within our MAX_AGGREGATION_MS time
 545          * - the resulting packet wont be bigger than
 546          *   MAX_AGGREGATION_BYTES
 547          * otherwise aggregation is not possible
 548          */
 549         if (!time_before(send_time, forw_packet->send_time) ||
 550             !time_after_eq(aggregation_end_time, forw_packet->send_time))
 551                 return false;
 552
 553         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
 554                 return false;
 555
 556         /* packet is not leaving on the same interface. */
 557         if (forw_packet->if_outgoing != if_outgoing)
 558                 return false;
 559
 560         /* check aggregation compatibility
 561          * -> direct link packets are broadcasted on
 562          *    their interface only
 563          * -> aggregate packet if the current packet is
 564          *    a "global" packet as well as the base
 565          *    packet
 566          */
 567         primary_if = batadv_primary_if_get_selected(bat_priv);
 568         if (!primary_if)
 569                 return false;
 570
 571         /* packets without direct link flag and high TTL
 572          * are flooded through the net
 573          */
 574         if (!directlink &&
 575             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
 576             batadv_ogm_packet->ttl != 1 &&
 577
 578             /* own packets originating non-primary
 579              * interfaces leave only that interface
 580              */
 581             (!forw_packet->own ||
 582              forw_packet->if_incoming == primary_if)) {
 583                 res = true;
 584                 goto out;
 585         }
 586
 587         /* if the incoming packet is sent via this one
 588          * interface only - we still can aggregate
 589          */
 590         if (directlink &&
 591             new_bat_ogm_packet->ttl == 1 &&
 592             forw_packet->if_incoming == if_incoming &&
 593
 594             /* packets from direct neighbors or
 595              * own secondary interface packets
 596              * (= secondary interface packets in general)
 597              */
 598             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 599              (forw_packet->own &&
 600               forw_packet->if_incoming != primary_if))) {
 601                 res = true;
 602                 goto out;
 603         }
 604
 605 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_free_outgoing;
 646                 }
 647         }
 648
 649         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 650         if (!forw_packet_aggr)
 651                 goto out_nomem;
 652
 653         if (atomic_read(&bat_priv->aggregated_ogms) &&
 654             packet_len < BATADV_MAX_AGGREGATION_BYTES)
 655                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 656         else
 657                 skb_size = packet_len;
 658
 659         skb_size += ETH_HLEN;
 660
 661         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 662         if (!forw_packet_aggr->skb)
 663                 goto out_free_forw_packet;
 664         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 665         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 666
 667         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 668         forw_packet_aggr->packet_len = packet_len;
 669         memcpy(skb_buff, packet_buff, packet_len);
 670
 671         forw_packet_aggr->own = own_packet;
 672         forw_packet_aggr->if_incoming = if_incoming;
 673         forw_packet_aggr->if_outgoing = if_outgoing;
 674         forw_packet_aggr->num_packets = 0;
 675         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 676         forw_packet_aggr->send_time = send_time;
 677
 678         /* save packet direct link flag status */
 679         if (direct_link)
 680                 forw_packet_aggr->direct_link_flags |= 1;
 681
 682         /* add new packet to packet list */
 683         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 684         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 685         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 686
 687         /* start timer for this packet */
 688         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 689                           batadv_send_outstanding_bat_ogm_packet);
 690         queue_delayed_work(batadv_event_workqueue,
 691                            &forw_packet_aggr->delayed_work,
 692                            send_time - jiffies);
 693
 694         return;
 695 out_free_forw_packet:
 696         kfree(forw_packet_aggr);
 697 out_nomem:
 698         if (!own_packet)
 699                 atomic_inc(&bat_priv->batman_queue_left);
 700 out_free_outgoing:
 701         batadv_hardif_free_ref(if_outgoing);
 702 out_free_incoming:
 703         batadv_hardif_free_ref(if_incoming);
 704 }
 705
 706 /* aggregate a new packet into the existing ogm packet */
 707 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 708                                     const unsigned char *packet_buff,
 709                                     int packet_len, bool direct_link)
 710 {
 711         unsigned char *skb_buff;
 712         unsigned long new_direct_link_flag;
 713
 714         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 715         memcpy(skb_buff, packet_buff, packet_len);
 716         forw_packet_aggr->packet_len += packet_len;
 717         forw_packet_aggr->num_packets++;
 718
 719         /* save packet direct link flag status */
 720         if (direct_link) {
 721                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 722                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 723         }
 724 }
 725
 726 /**
 727  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 728  * @bat_priv: the bat priv with all the soft interface information
 729  * @packet_buff: pointer to the OGM
 730  * @packet_len: (total) length of the OGM
 731  * @if_incoming: interface where the packet was received
 732  * @if_outgoing: interface for which the retransmission should be considered
 733  * @own_packet: true if it is a self-generated ogm
 734  * @send_time: timestamp (jiffies) when the packet is to be sent
 735  */
 736 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 737                                     unsigned char *packet_buff,
 738                                     int packet_len,
 739                                     struct batadv_hard_iface *if_incoming,
 740                                     struct batadv_hard_iface *if_outgoing,
 741                                     int own_packet, unsigned long send_time)
 742 {
 743         /* _aggr -> pointer to the packet we want to aggregate with
 744          * _pos -> pointer to the position in the queue
 745          */
 746         struct batadv_forw_packet *forw_packet_aggr = NULL;
 747         struct batadv_forw_packet *forw_packet_pos = NULL;
 748         struct batadv_ogm_packet *batadv_ogm_packet;
 749         bool direct_link;
 750         unsigned long max_aggregation_jiffies;
 751
 752         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 753         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 754         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 755
 756         /* find position for the packet in the forward queue */
 757         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 758         /* own packets are not to be aggregated */
 759         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 760                 hlist_for_each_entry(forw_packet_pos,
 761                                      &bat_priv->forw_bat_list, list) {
 762                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 763                                                         bat_priv, packet_len,
 764                                                         send_time, direct_link,
 765                                                         if_incoming,
 766                                                         if_outgoing,
 767                                                         forw_packet_pos)) {
 768                                 forw_packet_aggr = forw_packet_pos;
 769                                 break;
 770                         }
 771                 }
 772         }
 773
 774         /* nothing to aggregate with - either aggregation disabled or no
 775          * suitable aggregation packet found
 776          */
 777         if (!forw_packet_aggr) {
 778                 /* the following section can run without the lock */
 779                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 780
 781                 /* if we could not aggregate this packet with one of the others
 782                  * we hold it back for a while, so that it might be aggregated
 783                  * later on
 784                  */
 785                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 786                         send_time += max_aggregation_jiffies;
 787
 788                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 789                                             send_time, direct_link,
 790                                             if_incoming, if_outgoing,
 791                                             own_packet);
 792         } else {
 793                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 794                                         packet_len, direct_link);
 795                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 796         }
 797 }
 798
 799 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 800                                   const struct ethhdr *ethhdr,
 801                                   struct batadv_ogm_packet *batadv_ogm_packet,
 802                                   bool is_single_hop_neigh,
 803                                   bool is_from_best_next_hop,
 804                                   struct batadv_hard_iface *if_incoming,
 805                                   struct batadv_hard_iface *if_outgoing)
 806 {
 807         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 808         uint16_t tvlv_len;
 809
 810         if (batadv_ogm_packet->ttl <= 1) {
 811                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 812                 return;
 813         }
 814
 815         if (!is_from_best_next_hop) {
 816                 /* Mark the forwarded packet when it is not coming from our
 817                  * best next hop. We still need to forward the packet for our
 818                  * neighbor link quality detection to work in case the packet
 819                  * originated from a single hop neighbor. Otherwise we can
 820                  * simply drop the ogm.
 821                  */
 822                 if (is_single_hop_neigh)
 823                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 824                 else
 825                         return;
 826         }
 827
 828         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 829
 830         batadv_ogm_packet->ttl--;
 831         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 832
 833         /* apply hop penalty */
 834         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 835                                                    bat_priv);
 836
 837         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 838                    "Forwarding packet: tq: %i, ttl: %i\n",
 839                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 840
 841         /* switch of primaries first hop flag when forwarding */
 842         batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
 843         if (is_single_hop_neigh)
 844                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 845         else
 846                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 847
 848         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 849                                 BATADV_OGM_HLEN + tvlv_len,
 850                                 if_incoming, if_outgoing, 0,
 851                                 batadv_iv_ogm_fwd_send_time());
 852 }
 853
 854 /**
 855  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 856  * the given interface
 857  * @hard_iface: the interface for which the windows have to be shifted
 858  */
 859 static void
 860 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 861 {
 862         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 863         struct batadv_hashtable *hash = bat_priv->orig_hash;
 864         struct hlist_head *head;
 865         struct batadv_orig_node *orig_node;
 866         unsigned long *word;
 867         uint32_t i;
 868         size_t word_index;
 869         uint8_t *w;
 870         int if_num;
 871
 872         for (i = 0; i < hash->size; i++) {
 873                 head = &hash->table[i];
 874
 875                 rcu_read_lock();
 876                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 877                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 878                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 879                         word = &orig_node->bat_iv.bcast_own[word_index];
 880
 881                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 882                         if_num = hard_iface->if_num;
 883                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 884                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 885                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 886                 }
 887                 rcu_read_unlock();
 888         }
 889 }
 890
 891 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 892 {
 893         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 894         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 895         struct batadv_ogm_packet *batadv_ogm_packet;
 896         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 897         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 898         uint32_t seqno;
 899         uint16_t tvlv_len = 0;
 900         unsigned long send_time;
 901
 902         primary_if = batadv_primary_if_get_selected(bat_priv);
 903
 904         if (hard_iface == primary_if) {
 905                 /* tt changes have to be committed before the tvlv data is
 906                  * appended as it may alter the tt tvlv container
 907                  */
 908                 batadv_tt_local_commit_changes(bat_priv);
 909                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 910                                                             ogm_buff_len,
 911                                                             BATADV_OGM_HLEN);
 912         }
 913
 914         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 915         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 916
 917         /* change sequence number to network order */
 918         seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 919         batadv_ogm_packet->seqno = htonl(seqno);
 920         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 921
 922         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 923
 924         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 925
 926         if (hard_iface != primary_if) {
 927                 /* OGMs from secondary interfaces are only scheduled on their
 928                  * respective interfaces.
 929                  */
 930                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 931                                         hard_iface, hard_iface, 1, send_time);
 932                 goto out;
 933         }
 934
 935         /* OGMs from primary interfaces are scheduled on all
 936          * interfaces.
 937          */
 938         rcu_read_lock();
 939         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 940                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 941                                 continue;
 942                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 943                                         *ogm_buff_len, hard_iface,
 944                                         tmp_hard_iface, 1, send_time);
 945         }
 946         rcu_read_unlock();
 947
 948 out:
 949         if (primary_if)
 950                 batadv_hardif_free_ref(primary_if);
 951 }
 952
 953 /**
 954  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
 955  *  originator
 956  * @bat_priv: the bat priv with all the soft interface information
 957  * @orig_node: the orig node who originally emitted the ogm packet
 958  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
 959  * @ethhdr: Ethernet header of the OGM
 960  * @batadv_ogm_packet: the ogm packet
 961  * @if_incoming: interface where the packet was received
 962  * @if_outgoing: interface for which the retransmission should be considered
 963  * @dup_status: the duplicate status of this ogm packet.
 964  */
 965 static void
 966 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 967                           struct batadv_orig_node *orig_node,
 968                           struct batadv_orig_ifinfo *orig_ifinfo,
 969                           const struct ethhdr *ethhdr,
 970                           const struct batadv_ogm_packet *batadv_ogm_packet,
 971                           struct batadv_hard_iface *if_incoming,
 972                           struct batadv_hard_iface *if_outgoing,
 973                           enum batadv_dup_status dup_status)
 974 {
 975         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
 976         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
 977         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 978         struct batadv_neigh_node *router = NULL;
 979         struct batadv_orig_node *orig_node_tmp;
 980         int if_num;
 981         uint8_t sum_orig, sum_neigh;
 982         uint8_t *neigh_addr;
 983         uint8_t tq_avg;
 984
 985         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 986                    "update_originator(): Searching and updating originator entry of received packet\n");
 987
 988         rcu_read_lock();
 989         hlist_for_each_entry_rcu(tmp_neigh_node,
 990                                  &orig_node->neigh_list, list) {
 991                 neigh_addr = tmp_neigh_node->addr;
 992                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 993                     tmp_neigh_node->if_incoming == if_incoming &&
 994                     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 995                         if (WARN(neigh_node, "too many matching neigh_nodes"))
 996                                 batadv_neigh_node_free_ref(neigh_node);
 997                         neigh_node = tmp_neigh_node;
 998                         continue;
 999                 }
1000
1001                 if (dup_status != BATADV_NO_DUP)
1002                         continue;
1003
1004                 /* only update the entry for this outgoing interface */
1005                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1006                                                        if_outgoing);
1007                 if (!neigh_ifinfo)
1008                         continue;
1009
1010                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1011                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1012                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1013                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1014                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1015                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1016
1017                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1018                 neigh_ifinfo = NULL;
1019         }
1020
1021         if (!neigh_node) {
1022                 struct batadv_orig_node *orig_tmp;
1023
1024                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1025                 if (!orig_tmp)
1026                         goto unlock;
1027
1028                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1029                                                      ethhdr->h_source,
1030                                                      orig_node, orig_tmp);
1031
1032                 batadv_orig_node_free_ref(orig_tmp);
1033                 if (!neigh_node)
1034                         goto unlock;
1035         } else
1036                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1037                            "Updating existing last-hop neighbor of originator\n");
1038
1039         rcu_read_unlock();
1040         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1041         if (!neigh_ifinfo)
1042                 goto out;
1043
1044         neigh_node->last_seen = jiffies;
1045
1046         spin_lock_bh(&neigh_node->ifinfo_lock);
1047         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1048                                &neigh_ifinfo->bat_iv.tq_index,
1049                                batadv_ogm_packet->tq);
1050         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1051         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1052         spin_unlock_bh(&neigh_node->ifinfo_lock);
1053
1054         if (dup_status == BATADV_NO_DUP) {
1055                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1056                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1057         }
1058
1059         /* if this neighbor already is our next hop there is nothing
1060          * to change
1061          */
1062         router = batadv_orig_router_get(orig_node, if_outgoing);
1063         if (router == neigh_node)
1064                 goto out;
1065
1066         if (router) {
1067                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1068                 if (!router_ifinfo)
1069                         goto out;
1070
1071                 /* if this neighbor does not offer a better TQ we won't
1072                  * consider it
1073                  */
1074                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1075                         goto out;
1076         }
1077
1078         /* if the TQ is the same and the link not more symmetric we
1079          * won't consider it either
1080          */
1081         if (router_ifinfo &&
1082             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1083                 orig_node_tmp = router->orig_node;
1084                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1085                 if_num = router->if_incoming->if_num;
1086                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1087                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1088
1089                 orig_node_tmp = neigh_node->orig_node;
1090                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1091                 if_num = neigh_node->if_incoming->if_num;
1092                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1093                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1094
1095                 if (sum_orig >= sum_neigh)
1096                         goto out;
1097         }
1098
1099         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1100         goto out;
1101
1102 unlock:
1103         rcu_read_unlock();
1104 out:
1105         if (neigh_node)
1106                 batadv_neigh_node_free_ref(neigh_node);
1107         if (router)
1108                 batadv_neigh_node_free_ref(router);
1109         if (neigh_ifinfo)
1110                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1111         if (router_ifinfo)
1112                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1113 }
1114
1115 /**
1116  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1117  * @orig_node: the orig node who originally emitted the ogm packet
1118  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1119  * @batadv_ogm_packet: the ogm packet
1120  * @if_incoming: interface where the packet was received
1121  * @if_outgoing: interface for which the retransmission should be considered
1122  *
1123  * Returns 1 if the link can be considered bidirectional, 0 otherwise
1124  */
1125 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1126                                  struct batadv_orig_node *orig_neigh_node,
1127                                  struct batadv_ogm_packet *batadv_ogm_packet,
1128                                  struct batadv_hard_iface *if_incoming,
1129                                  struct batadv_hard_iface *if_outgoing)
1130 {
1131         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1132         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1133         struct batadv_neigh_ifinfo *neigh_ifinfo;
1134         uint8_t total_count;
1135         uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1136         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1137         int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
1138         unsigned int combined_tq;
1139         int tq_iface_penalty;
1140
1141         /* find corresponding one hop neighbor */
1142         rcu_read_lock();
1143         hlist_for_each_entry_rcu(tmp_neigh_node,
1144                                  &orig_neigh_node->neigh_list, list) {
1145                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1146                                         orig_neigh_node->orig))
1147                         continue;
1148
1149                 if (tmp_neigh_node->if_incoming != if_incoming)
1150                         continue;
1151
1152                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1153                         continue;
1154
1155                 neigh_node = tmp_neigh_node;
1156                 break;
1157         }
1158         rcu_read_unlock();
1159
1160         if (!neigh_node)
1161                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1162                                                      orig_neigh_node->orig,
1163                                                      orig_neigh_node,
1164                                                      orig_neigh_node);
1165
1166         if (!neigh_node)
1167                 goto out;
1168
1169         /* if orig_node is direct neighbor update neigh_node last_seen */
1170         if (orig_node == orig_neigh_node)
1171                 neigh_node->last_seen = jiffies;
1172
1173         orig_node->last_seen = jiffies;
1174
1175         /* find packet count of corresponding one hop neighbor */
1176         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1177         if_num = if_incoming->if_num;
1178         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1179         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1180         if (neigh_ifinfo) {
1181                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1182                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1183         } else {
1184                 neigh_rq_count = 0;
1185         }
1186         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1187
1188         /* pay attention to not get a value bigger than 100 % */
1189         if (orig_eq_count > neigh_rq_count)
1190                 total_count = neigh_rq_count;
1191         else
1192                 total_count = orig_eq_count;
1193
1194         /* if we have too few packets (too less data) we set tq_own to zero
1195          * if we receive too few packets it is not considered bidirectional
1196          */
1197         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1198             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1199                 tq_own = 0;
1200         else
1201                 /* neigh_node->real_packet_count is never zero as we
1202                  * only purge old information when getting new
1203                  * information
1204                  */
1205                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1206
1207         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1208          * affect the nearly-symmetric links only a little, but
1209          * punishes asymmetric links more.  This will give a value
1210          * between 0 and TQ_MAX_VALUE
1211          */
1212         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1213         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1214         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1215                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1216                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1217         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1218         inv_asym_penalty /= neigh_rq_max_cube;
1219         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1220
1221         /* penalize if the OGM is forwarded on the same interface. WiFi
1222          * interfaces and other half duplex devices suffer from throughput
1223          * drops as they can't send and receive at the same time.
1224          */
1225         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1226         if (if_outgoing && (if_incoming == if_outgoing) &&
1227             batadv_is_wifi_netdev(if_outgoing->net_dev))
1228                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1229                                                       bat_priv);
1230
1231         combined_tq = batadv_ogm_packet->tq *
1232                       tq_own *
1233                       tq_asym_penalty *
1234                       tq_iface_penalty;
1235         combined_tq /= BATADV_TQ_MAX_VALUE *
1236                        BATADV_TQ_MAX_VALUE *
1237                        BATADV_TQ_MAX_VALUE;
1238         batadv_ogm_packet->tq = combined_tq;
1239
1240         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1241                    "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",
1242                    orig_node->orig, orig_neigh_node->orig, total_count,
1243                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1244                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1245                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1246
1247         /* if link has the minimum required transmission quality
1248          * consider it bidirectional
1249          */
1250         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1251                 ret = 1;
1252
1253 out:
1254         if (neigh_node)
1255                 batadv_neigh_node_free_ref(neigh_node);
1256         return ret;
1257 }
1258
1259 /**
1260  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1261  *  adjust the sequence number and find out whether it is a duplicate
1262  * @ethhdr: ethernet header of the packet
1263  * @batadv_ogm_packet: OGM packet to be considered
1264  * @if_incoming: interface on which the OGM packet was received
1265  * @if_outgoing: interface for which the retransmission should be considered
1266  *
1267  * Returns duplicate status as enum batadv_dup_status
1268  */
1269 static enum batadv_dup_status
1270 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1271                             const struct batadv_ogm_packet *batadv_ogm_packet,
1272                             const struct batadv_hard_iface *if_incoming,
1273                             struct batadv_hard_iface *if_outgoing)
1274 {
1275         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1276         struct batadv_orig_node *orig_node;
1277         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1278         struct batadv_neigh_node *neigh_node;
1279         struct batadv_neigh_ifinfo *neigh_ifinfo;
1280         int is_dup;
1281         int32_t seq_diff;
1282         int need_update = 0;
1283         int set_mark;
1284         enum batadv_dup_status ret = BATADV_NO_DUP;
1285         uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
1286         uint8_t *neigh_addr;
1287         uint8_t packet_count;
1288         unsigned long *bitmap;
1289
1290         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1291         if (!orig_node)
1292                 return BATADV_NO_DUP;
1293
1294         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1295         if (WARN_ON(!orig_ifinfo)) {
1296                 batadv_orig_node_free_ref(orig_node);
1297                 return 0;
1298         }
1299
1300         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1301         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1302
1303         /* signalize caller that the packet is to be dropped. */
1304         if (!hlist_empty(&orig_node->neigh_list) &&
1305             batadv_window_protected(bat_priv, seq_diff,
1306                                     &orig_ifinfo->batman_seqno_reset)) {
1307                 ret = BATADV_PROTECTED;
1308                 goto out;
1309         }
1310
1311         rcu_read_lock();
1312         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1313                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1314                                                        if_outgoing);
1315                 if (!neigh_ifinfo)
1316                         continue;
1317
1318                 neigh_addr = neigh_node->addr;
1319                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1320                                          orig_ifinfo->last_real_seqno,
1321                                          seqno);
1322
1323                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1324                     neigh_node->if_incoming == if_incoming) {
1325                         set_mark = 1;
1326                         if (is_dup)
1327                                 ret = BATADV_NEIGH_DUP;
1328                 } else {
1329                         set_mark = 0;
1330                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1331                                 ret = BATADV_ORIG_DUP;
1332                 }
1333
1334                 /* if the window moved, set the update flag. */
1335                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1336                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1337                                                      seq_diff, set_mark);
1338
1339                 packet_count = bitmap_weight(bitmap,
1340                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1341                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1342                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1343         }
1344         rcu_read_unlock();
1345
1346         if (need_update) {
1347                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1348                            "%s updating last_seqno: old %u, new %u\n",
1349                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1350                            orig_ifinfo->last_real_seqno, seqno);
1351                 orig_ifinfo->last_real_seqno = seqno;
1352         }
1353
1354 out:
1355         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1356         batadv_orig_node_free_ref(orig_node);
1357         if (orig_ifinfo)
1358                 batadv_orig_ifinfo_free_ref(orig_ifinfo);
1359         return ret;
1360 }
1361
1362 /**
1363  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1364  * @skb: the skb containing the OGM
1365  * @ogm_offset: offset from skb->data to start of ogm header
1366  * @orig_node: the (cached) orig node for the originator of this OGM
1367  * @if_incoming: the interface where this packet was received
1368  * @if_outgoing: the interface for which the packet should be considered
1369  */
1370 static void
1371 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1372                                 struct batadv_orig_node *orig_node,
1373                                 struct batadv_hard_iface *if_incoming,
1374                                 struct batadv_hard_iface *if_outgoing)
1375 {
1376         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1377         struct batadv_neigh_node *router = NULL, *router_router = NULL;
1378         struct batadv_orig_node *orig_neigh_node;
1379         struct batadv_orig_ifinfo *orig_ifinfo;
1380         struct batadv_neigh_node *orig_neigh_router = NULL;
1381         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1382         struct batadv_ogm_packet *ogm_packet;
1383         enum batadv_dup_status dup_status;
1384         bool is_from_best_next_hop = false;
1385         bool is_single_hop_neigh = false;
1386         bool sameseq, similar_ttl;
1387         struct sk_buff *skb_priv;
1388         struct ethhdr *ethhdr;
1389         uint8_t *prev_sender;
1390         int is_bidirect;
1391
1392         /* create a private copy of the skb, as some functions change tq value
1393          * and/or flags.
1394          */
1395         skb_priv = skb_copy(skb, GFP_ATOMIC);
1396         if (!skb_priv)
1397                 return;
1398
1399         ethhdr = eth_hdr(skb_priv);
1400         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1401
1402         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1403                                                  if_incoming, if_outgoing);
1404         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1405                 is_single_hop_neigh = true;
1406
1407         if (dup_status == BATADV_PROTECTED) {
1408                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1409                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1410                            ethhdr->h_source);
1411                 goto out;
1412         }
1413
1414         if (ogm_packet->tq == 0) {
1415                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1416                            "Drop packet: originator packet with tq equal 0\n");
1417                 goto out;
1418         }
1419
1420         router = batadv_orig_router_get(orig_node, if_outgoing);
1421         if (router) {
1422                 router_router = batadv_orig_router_get(router->orig_node,
1423                                                        if_outgoing);
1424                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1425         }
1426
1427         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1428             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1429                 is_from_best_next_hop = true;
1430
1431         prev_sender = ogm_packet->prev_sender;
1432         /* avoid temporary routing loops */
1433         if (router && router_router &&
1434             (batadv_compare_eth(router->addr, prev_sender)) &&
1435             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1436             (batadv_compare_eth(router->addr, router_router->addr))) {
1437                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1438                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1439                            ethhdr->h_source);
1440                 goto out;
1441         }
1442
1443         if (if_outgoing == BATADV_IF_DEFAULT)
1444                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1445
1446         /* if sender is a direct neighbor the sender mac equals
1447          * originator mac
1448          */
1449         if (is_single_hop_neigh)
1450                 orig_neigh_node = orig_node;
1451         else
1452                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1453                                                          ethhdr->h_source);
1454
1455         if (!orig_neigh_node)
1456                 goto out;
1457
1458         /* Update nc_nodes of the originator */
1459         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1460                                  ogm_packet, is_single_hop_neigh);
1461
1462         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1463                                                    if_outgoing);
1464
1465         /* drop packet if sender is not a direct neighbor and if we
1466          * don't route towards it
1467          */
1468         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1469                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1470                            "Drop packet: OGM via unknown neighbor!\n");
1471                 goto out_neigh;
1472         }
1473
1474         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1475                                             ogm_packet, if_incoming,
1476                                             if_outgoing);
1477
1478         /* update ranking if it is not a duplicate or has the same
1479          * seqno and similar ttl as the non-duplicate
1480          */
1481         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1482         if (!orig_ifinfo)
1483                 goto out_neigh;
1484
1485         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1486         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1487
1488         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1489                             (sameseq && similar_ttl))) {
1490                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1491                                           orig_ifinfo, ethhdr,
1492                                           ogm_packet, if_incoming,
1493                                           if_outgoing, dup_status);
1494         }
1495         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1496
1497         /* only forward for specific interface, not for the default one. */
1498         if (if_outgoing == BATADV_IF_DEFAULT)
1499                 goto out_neigh;
1500
1501         /* is single hop (direct) neighbor */
1502         if (is_single_hop_neigh) {
1503                 /* OGMs from secondary interfaces should only scheduled once
1504                  * per interface where it has been received, not multiple times
1505                  */
1506                 if ((ogm_packet->ttl <= 2) &&
1507                     (if_incoming != if_outgoing)) {
1508                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1509                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1510                         goto out_neigh;
1511                 }
1512                 /* mark direct link on incoming interface */
1513                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1514                                       is_single_hop_neigh,
1515                                       is_from_best_next_hop, if_incoming,
1516                                       if_outgoing);
1517
1518                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1519                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1520                 goto out_neigh;
1521         }
1522
1523         /* multihop originator */
1524         if (!is_bidirect) {
1525                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1526                            "Drop packet: not received via bidirectional link\n");
1527                 goto out_neigh;
1528         }
1529
1530         if (dup_status == BATADV_NEIGH_DUP) {
1531                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1532                            "Drop packet: duplicate packet received\n");
1533                 goto out_neigh;
1534         }
1535
1536         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1537                    "Forwarding packet: rebroadcast originator packet\n");
1538         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1539                               is_single_hop_neigh, is_from_best_next_hop,
1540                               if_incoming, if_outgoing);
1541
1542 out_neigh:
1543         if ((orig_neigh_node) && (!is_single_hop_neigh))
1544                 batadv_orig_node_free_ref(orig_neigh_node);
1545 out:
1546         if (router_ifinfo)
1547                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1548         if (router)
1549                 batadv_neigh_node_free_ref(router);
1550         if (router_router)
1551                 batadv_neigh_node_free_ref(router_router);
1552         if (orig_neigh_router)
1553                 batadv_neigh_node_free_ref(orig_neigh_router);
1554
1555         kfree_skb(skb_priv);
1556 }
1557
1558 /**
1559  * batadv_iv_ogm_process - process an incoming batman iv OGM
1560  * @skb: the skb containing the OGM
1561  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1562  * @if_incoming: the interface where this packet was receved
1563  */
1564 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1565                                   struct batadv_hard_iface *if_incoming)
1566 {
1567         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1568         struct batadv_orig_node *orig_neigh_node, *orig_node;
1569         struct batadv_hard_iface *hard_iface;
1570         struct batadv_ogm_packet *ogm_packet;
1571         uint32_t if_incoming_seqno;
1572         bool has_directlink_flag;
1573         struct ethhdr *ethhdr;
1574         bool is_my_oldorig = false;
1575         bool is_my_addr = false;
1576         bool is_my_orig = false;
1577
1578         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1579         ethhdr = eth_hdr(skb);
1580
1581         /* Silently drop when the batman packet is actually not a
1582          * correct packet.
1583          *
1584          * This might happen if a packet is padded (e.g. Ethernet has a
1585          * minimum frame length of 64 byte) and the aggregation interprets
1586          * it as an additional length.
1587          *
1588          * TODO: A more sane solution would be to have a bit in the
1589          * batadv_ogm_packet to detect whether the packet is the last
1590          * packet in an aggregation.  Here we expect that the padding
1591          * is always zero (or not 0x01)
1592          */
1593         if (ogm_packet->packet_type != BATADV_IV_OGM)
1594                 return;
1595
1596         /* could be changed by schedule_own_packet() */
1597         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1598
1599         if (ogm_packet->flags & BATADV_DIRECTLINK)
1600                 has_directlink_flag = true;
1601         else
1602                 has_directlink_flag = false;
1603
1604         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1605                    "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",
1606                    ethhdr->h_source, if_incoming->net_dev->name,
1607                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1608                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1609                    ogm_packet->tq, ogm_packet->ttl,
1610                    ogm_packet->version, has_directlink_flag);
1611
1612         rcu_read_lock();
1613         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1614                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1615                         continue;
1616
1617                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1618                         continue;
1619
1620                 if (batadv_compare_eth(ethhdr->h_source,
1621                                        hard_iface->net_dev->dev_addr))
1622                         is_my_addr = true;
1623
1624                 if (batadv_compare_eth(ogm_packet->orig,
1625                                        hard_iface->net_dev->dev_addr))
1626                         is_my_orig = true;
1627
1628                 if (batadv_compare_eth(ogm_packet->prev_sender,
1629                                        hard_iface->net_dev->dev_addr))
1630                         is_my_oldorig = true;
1631         }
1632         rcu_read_unlock();
1633
1634         if (is_my_addr) {
1635                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1636                            "Drop packet: received my own broadcast (sender: %pM)\n",
1637                            ethhdr->h_source);
1638                 return;
1639         }
1640
1641         if (is_my_orig) {
1642                 unsigned long *word;
1643                 int offset;
1644                 int32_t bit_pos;
1645                 int16_t if_num;
1646                 uint8_t *weight;
1647
1648                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1649                                                          ethhdr->h_source);
1650                 if (!orig_neigh_node)
1651                         return;
1652
1653                 /* neighbor has to indicate direct link and it has to
1654                  * come via the corresponding interface
1655                  * save packet seqno for bidirectional check
1656                  */
1657                 if (has_directlink_flag &&
1658                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1659                                        ogm_packet->orig)) {
1660                         if_num = if_incoming->if_num;
1661                         offset = if_num * BATADV_NUM_WORDS;
1662
1663                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1664                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1665                         bit_pos = if_incoming_seqno - 2;
1666                         bit_pos -= ntohl(ogm_packet->seqno);
1667                         batadv_set_bit(word, bit_pos);
1668                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1669                         *weight = bitmap_weight(word,
1670                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1671                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1672                 }
1673
1674                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1675                            "Drop packet: originator packet from myself (via neighbor)\n");
1676                 batadv_orig_node_free_ref(orig_neigh_node);
1677                 return;
1678         }
1679
1680         if (is_my_oldorig) {
1681                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1682                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1683                            ethhdr->h_source);
1684                 return;
1685         }
1686
1687         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1688                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1689                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1690                            ethhdr->h_source);
1691                 return;
1692         }
1693
1694         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1695         if (!orig_node)
1696                 return;
1697
1698         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1699                                         if_incoming, BATADV_IF_DEFAULT);
1700
1701         rcu_read_lock();
1702         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1703                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1704                         continue;
1705
1706                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1707                         continue;
1708
1709                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1710                                                 if_incoming, hard_iface);
1711         }
1712         rcu_read_unlock();
1713
1714         batadv_orig_node_free_ref(orig_node);
1715 }
1716
1717 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1718                                  struct batadv_hard_iface *if_incoming)
1719 {
1720         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1721         struct batadv_ogm_packet *ogm_packet;
1722         uint8_t *packet_pos;
1723         int ogm_offset;
1724         bool ret;
1725
1726         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1727         if (!ret)
1728                 return NET_RX_DROP;
1729
1730         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1731          * that does not have B.A.T.M.A.N. IV enabled ?
1732          */
1733         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1734                 return NET_RX_DROP;
1735
1736         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1737         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1738                            skb->len + ETH_HLEN);
1739
1740         ogm_offset = 0;
1741         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1742
1743         /* unpack the aggregated packets and process them one by one */
1744         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1745                                          ogm_packet->tvlv_len)) {
1746                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1747
1748                 ogm_offset += BATADV_OGM_HLEN;
1749                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1750
1751                 packet_pos = skb->data + ogm_offset;
1752                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1753         }
1754
1755         kfree_skb(skb);
1756         return NET_RX_SUCCESS;
1757 }
1758
1759 /**
1760  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1761  * @orig_node: the orig_node for which the neighbors are printed
1762  * @if_outgoing: outgoing interface for these entries
1763  * @seq: debugfs table seq_file struct
1764  *
1765  * Must be called while holding an rcu lock.
1766  */
1767 static void
1768 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1769                                struct batadv_hard_iface *if_outgoing,
1770                                struct seq_file *seq)
1771 {
1772         struct batadv_neigh_node *neigh_node;
1773         struct batadv_neigh_ifinfo *n_ifinfo;
1774
1775         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1776                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1777                 if (!n_ifinfo)
1778                         continue;
1779
1780                 seq_printf(seq, " %pM (%3i)",
1781                            neigh_node->addr,
1782                            n_ifinfo->bat_iv.tq_avg);
1783
1784                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1785         }
1786 }
1787
1788 /**
1789  * batadv_iv_ogm_orig_print - print the originator table
1790  * @bat_priv: the bat priv with all the soft interface information
1791  * @seq: debugfs table seq_file struct
1792  * @if_outgoing: the outgoing interface for which this should be printed
1793  */
1794 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1795                                      struct seq_file *seq,
1796                                      struct batadv_hard_iface *if_outgoing)
1797 {
1798         struct batadv_neigh_node *neigh_node;
1799         struct batadv_hashtable *hash = bat_priv->orig_hash;
1800         int last_seen_msecs, last_seen_secs;
1801         struct batadv_orig_node *orig_node;
1802         struct batadv_neigh_ifinfo *n_ifinfo;
1803         unsigned long last_seen_jiffies;
1804         struct hlist_head *head;
1805         int batman_count = 0;
1806         uint32_t i;
1807
1808         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1809                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1810                    "Nexthop", "outgoingIF", "Potential nexthops");
1811
1812         for (i = 0; i < hash->size; i++) {
1813                 head = &hash->table[i];
1814
1815                 rcu_read_lock();
1816                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1817                         neigh_node = batadv_orig_router_get(orig_node,
1818                                                             if_outgoing);
1819                         if (!neigh_node)
1820                                 continue;
1821
1822                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1823                                                            if_outgoing);
1824                         if (!n_ifinfo)
1825                                 goto next;
1826
1827                         if (n_ifinfo->bat_iv.tq_avg == 0)
1828                                 goto next;
1829
1830                         last_seen_jiffies = jiffies - orig_node->last_seen;
1831                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1832                         last_seen_secs = last_seen_msecs / 1000;
1833                         last_seen_msecs = last_seen_msecs % 1000;
1834
1835                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1836                                    orig_node->orig, last_seen_secs,
1837                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1838                                    neigh_node->addr,
1839                                    neigh_node->if_incoming->net_dev->name);
1840
1841                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1842                                                        seq);
1843                         seq_puts(seq, "\n");
1844                         batman_count++;
1845
1846 next:
1847                         batadv_neigh_node_free_ref(neigh_node);
1848                         if (n_ifinfo)
1849                                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1850                 }
1851                 rcu_read_unlock();
1852         }
1853
1854         if (batman_count == 0)
1855                 seq_puts(seq, "No batman nodes in range ...\n");
1856 }
1857
1858 /**
1859  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1860  * @neigh1: the first neighbor object of the comparison
1861  * @if_outgoing1: outgoing interface for the first neighbor
1862  * @neigh2: the second neighbor object of the comparison
1863  * @if_outgoing2: outgoing interface for the second neighbor
1864  *
1865  * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1866  * lower, the same as or higher than the metric via neigh2
1867  */
1868 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1869                                    struct batadv_hard_iface *if_outgoing1,
1870                                    struct batadv_neigh_node *neigh2,
1871                                    struct batadv_hard_iface *if_outgoing2)
1872 {
1873         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1874         uint8_t tq1, tq2;
1875         int diff;
1876
1877         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1878         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1879
1880         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1881                 diff = 0;
1882                 goto out;
1883         }
1884
1885         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1886         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1887         diff = tq1 - tq2;
1888
1889 out:
1890         if (neigh1_ifinfo)
1891                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1892         if (neigh2_ifinfo)
1893                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1894
1895         return diff;
1896 }
1897
1898 /**
1899  * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
1900  *  neigh2 from the metric prospective
1901  * @neigh1: the first neighbor object of the comparison
1902  * @if_outgoing1: outgoing interface for the first neighbor
1903  * @neigh2: the second neighbor object of the comparison
1904  * @if_outgoing2: outgoing interface for the second neighbor
1905  *
1906  * Returns true if the metric via neigh1 is equally good or better than
1907  * the metric via neigh2, false otherwise.
1908  */
1909 static bool
1910 batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1,
1911                            struct batadv_hard_iface *if_outgoing1,
1912                            struct batadv_neigh_node *neigh2,
1913                            struct batadv_hard_iface *if_outgoing2)
1914 {
1915         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1916         uint8_t tq1, tq2;
1917         bool ret;
1918
1919         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1920         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1921
1922         /* we can't say that the metric is better */
1923         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1924                 ret = false;
1925                 goto out;
1926         }
1927
1928         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1929         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1930         ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
1931
1932 out:
1933         if (neigh1_ifinfo)
1934                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1935         if (neigh2_ifinfo)
1936                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1937
1938         return ret;
1939 }
1940
1941 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1942         .name = "BATMAN_IV",
1943         .bat_iface_enable = batadv_iv_ogm_iface_enable,
1944         .bat_iface_disable = batadv_iv_ogm_iface_disable,
1945         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1946         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1947         .bat_ogm_schedule = batadv_iv_ogm_schedule,
1948         .bat_ogm_emit = batadv_iv_ogm_emit,
1949         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
1950         .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
1951         .bat_orig_print = batadv_iv_ogm_orig_print,
1952         .bat_orig_free = batadv_iv_ogm_orig_free,
1953         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
1954         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
1955 };
1956
1957 int __init batadv_iv_init(void)
1958 {
1959         int ret;
1960
1961         /* batman originator packet */
1962         ret = batadv_recv_handler_register(BATADV_IV_OGM,
1963                                            batadv_iv_ogm_receive);
1964         if (ret < 0)
1965                 goto out;
1966
1967         ret = batadv_algo_register(&batadv_batman_iv);
1968         if (ret < 0)
1969                 goto handler_unregister;
1970
1971         goto out;
1972
1973 handler_unregister:
1974         batadv_recv_handler_unregister(BATADV_IV_OGM);
1975 out:
1976         return ret;
1977 }