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 "bat_algo.h"
  19 #include "main.h"
  20
  21 #include <linux/atomic.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/bitops.h>
  24 #include <linux/bug.h>
  25 #include <linux/byteorder/generic.h>
  26 #include <linux/cache.h>
  27 #include <linux/errno.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/fs.h>
  30 #include <linux/if_ether.h>
  31 #include <linux/init.h>
  32 #include <linux/jiffies.h>
  33 #include <linux/list.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/pkt_sched.h>
  36 #include <linux/printk.h>
  37 #include <linux/random.h>
  38 #include <linux/rculist.h>
  39 #include <linux/rcupdate.h>
  40 #include <linux/seq_file.h>
  41 #include <linux/skbuff.h>
  42 #include <linux/slab.h>
  43 #include <linux/spinlock.h>
  44 #include <linux/stddef.h>
  45 #include <linux/string.h>
  46 #include <linux/types.h>
  47 #include <linux/workqueue.h>
  48
  49 #include "bitarray.h"
  50 #include "hard-interface.h"
  51 #include "hash.h"
  52 #include "network-coding.h"
  53 #include "originator.h"
  54 #include "packet.h"
  55 #include "routing.h"
  56 #include "send.h"
  57 #include "translation-table.h"
  58
  59 /**
  60  * enum batadv_dup_status - duplicate status
  61  * @BATADV_NO_DUP: the packet is no duplicate
  62  * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
  63  *  neighbor)
  64  * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
  65  * @BATADV_PROTECTED: originator is currently protected (after reboot)
  66  */
  67 enum batadv_dup_status {
  68         BATADV_NO_DUP = 0,
  69         BATADV_ORIG_DUP,
  70         BATADV_NEIGH_DUP,
  71         BATADV_PROTECTED,
  72 };
  73
  74 /**
  75  * batadv_ring_buffer_set - update the ring buffer with the given value
  76  * @lq_recv: pointer to the ring buffer
  77  * @lq_index: index to store the value at
  78  * @value: value to store in the ring buffer
  79  */
  80 static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index,
  81                                    uint8_t value)
  82 {
  83         lq_recv[*lq_index] = value;
  84         *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
  85 }
  86
  87 /**
  88  * batadv_ring_buffer_avg - compute the average of all non-zero values stored
  89  * in the given ring buffer
  90  * @lq_recv: pointer to the ring buffer
  91  *
  92  * Returns computed average value.
  93  */
  94 static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[])
  95 {
  96         const uint8_t *ptr;
  97         uint16_t count = 0;
  98         uint16_t i = 0;
  99         uint16_t sum = 0;
 100
 101         ptr = lq_recv;
 102
 103         while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
 104                 if (*ptr != 0) {
 105                         count++;
 106                         sum += *ptr;
 107                 }
 108
 109                 i++;
 110                 ptr++;
 111         }
 112
 113         if (count == 0)
 114                 return 0;
 115
 116         return (uint8_t)(sum / count);
 117 }
 118
 119 /**
 120  * batadv_iv_ogm_orig_free - free the private resources allocated for this
 121  *  orig_node
 122  * @orig_node: the orig_node for which the resources have to be free'd
 123  */
 124 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
 125 {
 126         kfree(orig_node->bat_iv.bcast_own);
 127         kfree(orig_node->bat_iv.bcast_own_sum);
 128 }
 129
 130 /**
 131  * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
 132  *  include the new hard-interface
 133  * @orig_node: the orig_node that has to be changed
 134  * @max_if_num: the current amount of interfaces
 135  *
 136  * Returns 0 on success, a negative error code otherwise.
 137  */
 138 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
 139                                      int max_if_num)
 140 {
 141         void *data_ptr;
 142         size_t old_size;
 143         int ret = -ENOMEM;
 144
 145         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 146
 147         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 148         data_ptr = kmalloc_array(max_if_num,
 149                                  BATADV_NUM_WORDS * sizeof(unsigned long),
 150                                  GFP_ATOMIC);
 151         if (!data_ptr)
 152                 goto unlock;
 153
 154         memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
 155         kfree(orig_node->bat_iv.bcast_own);
 156         orig_node->bat_iv.bcast_own = data_ptr;
 157
 158         data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC);
 159         if (!data_ptr) {
 160                 kfree(orig_node->bat_iv.bcast_own);
 161                 goto unlock;
 162         }
 163
 164         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 165                (max_if_num - 1) * sizeof(uint8_t));
 166         kfree(orig_node->bat_iv.bcast_own_sum);
 167         orig_node->bat_iv.bcast_own_sum = data_ptr;
 168
 169         ret = 0;
 170
 171 unlock:
 172         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 173
 174         return ret;
 175 }
 176
 177 /**
 178  * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
 179  *  exclude the removed interface
 180  * @orig_node: the orig_node that has to be changed
 181  * @max_if_num: the current amount of interfaces
 182  * @del_if_num: the index of the interface being removed
 183  *
 184  * Returns 0 on success, a negative error code otherwise.
 185  */
 186 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
 187                                      int max_if_num, int del_if_num)
 188 {
 189         int chunk_size,  ret = -ENOMEM, if_offset;
 190         void *data_ptr = NULL;
 191
 192         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 193
 194         /* last interface was removed */
 195         if (max_if_num == 0)
 196                 goto free_bcast_own;
 197
 198         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 199         data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
 200         if (!data_ptr)
 201                 goto unlock;
 202
 203         /* copy first part */
 204         memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
 205
 206         /* copy second part */
 207         memcpy((char *)data_ptr + del_if_num * chunk_size,
 208                orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size),
 209                (max_if_num - del_if_num) * chunk_size);
 210
 211 free_bcast_own:
 212         kfree(orig_node->bat_iv.bcast_own);
 213         orig_node->bat_iv.bcast_own = data_ptr;
 214
 215         if (max_if_num == 0)
 216                 goto free_own_sum;
 217
 218         data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC);
 219         if (!data_ptr) {
 220                 kfree(orig_node->bat_iv.bcast_own);
 221                 goto unlock;
 222         }
 223
 224         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 225                del_if_num * sizeof(uint8_t));
 226
 227         if_offset = (del_if_num + 1) * sizeof(uint8_t);
 228         memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
 229                orig_node->bat_iv.bcast_own_sum + if_offset,
 230                (max_if_num - del_if_num) * sizeof(uint8_t));
 231
 232 free_own_sum:
 233         kfree(orig_node->bat_iv.bcast_own_sum);
 234         orig_node->bat_iv.bcast_own_sum = data_ptr;
 235
 236         ret = 0;
 237 unlock:
 238         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 239
 240         return ret;
 241 }
 242
 243 /**
 244  * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
 245  * @bat_priv: the bat priv with all the soft interface information
 246  * @addr: mac address of the originator
 247  *
 248  * Returns the originator object corresponding to the passed mac address or NULL
 249  * on failure.
 250  * If the object does not exists it is created an initialised.
 251  */
 252 static struct batadv_orig_node *
 253 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr)
 254 {
 255         struct batadv_orig_node *orig_node;
 256         int size, hash_added;
 257
 258         orig_node = batadv_orig_hash_find(bat_priv, addr);
 259         if (orig_node)
 260                 return orig_node;
 261
 262         orig_node = batadv_orig_node_new(bat_priv, addr);
 263         if (!orig_node)
 264                 return NULL;
 265
 266         spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
 267
 268         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 269         orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
 270         if (!orig_node->bat_iv.bcast_own)
 271                 goto free_orig_node;
 272
 273         size = bat_priv->num_ifaces * sizeof(uint8_t);
 274         orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 275         if (!orig_node->bat_iv.bcast_own_sum)
 276                 goto free_orig_node;
 277
 278         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 279                                      batadv_choose_orig, orig_node,
 280                                      &orig_node->hash_entry);
 281         if (hash_added != 0)
 282                 goto free_orig_node;
 283
 284         return orig_node;
 285
 286 free_orig_node:
 287         /* free twice, as batadv_orig_node_new sets refcount to 2 */
 288         batadv_orig_node_free_ref(orig_node);
 289         batadv_orig_node_free_ref(orig_node);
 290
 291         return NULL;
 292 }
 293
 294 static struct batadv_neigh_node *
 295 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
 296                         const uint8_t *neigh_addr,
 297                         struct batadv_orig_node *orig_node,
 298                         struct batadv_orig_node *orig_neigh)
 299 {
 300         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 301         struct batadv_neigh_node *neigh_node, *tmp_neigh_node;
 302
 303         neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node);
 304         if (!neigh_node)
 305                 goto out;
 306
 307         if (!atomic_inc_not_zero(&hard_iface->refcount)) {
 308                 kfree(neigh_node);
 309                 neigh_node = NULL;
 310                 goto out;
 311         }
 312
 313         neigh_node->orig_node = orig_neigh;
 314         neigh_node->if_incoming = hard_iface;
 315
 316         spin_lock_bh(&orig_node->neigh_list_lock);
 317         tmp_neigh_node = batadv_neigh_node_get(orig_node, hard_iface,
 318                                                neigh_addr);
 319         if (!tmp_neigh_node) {
 320                 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
 321         } else {
 322                 kfree(neigh_node);
 323                 batadv_hardif_free_ref(hard_iface);
 324                 neigh_node = tmp_neigh_node;
 325         }
 326         spin_unlock_bh(&orig_node->neigh_list_lock);
 327
 328         if (!tmp_neigh_node)
 329                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 330                            "Creating new neighbor %pM for orig_node %pM on interface %s\n",
 331                            neigh_addr, orig_node->orig,
 332                            hard_iface->net_dev->name);
 333
 334 out:
 335         return neigh_node;
 336 }
 337
 338 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
 339 {
 340         struct batadv_ogm_packet *batadv_ogm_packet;
 341         unsigned char *ogm_buff;
 342         uint32_t random_seqno;
 343
 344         /* randomize initial seqno to avoid collision */
 345         get_random_bytes(&random_seqno, sizeof(random_seqno));
 346         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 347
 348         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 349         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 350         if (!ogm_buff)
 351                 return -ENOMEM;
 352
 353         hard_iface->bat_iv.ogm_buff = ogm_buff;
 354
 355         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 356         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 357         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 358         batadv_ogm_packet->ttl = 2;
 359         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 360         batadv_ogm_packet->reserved = 0;
 361         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 362
 363         return 0;
 364 }
 365
 366 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 367 {
 368         kfree(hard_iface->bat_iv.ogm_buff);
 369         hard_iface->bat_iv.ogm_buff = NULL;
 370 }
 371
 372 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 373 {
 374         struct batadv_ogm_packet *batadv_ogm_packet;
 375         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 376
 377         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 378         ether_addr_copy(batadv_ogm_packet->orig,
 379                         hard_iface->net_dev->dev_addr);
 380         ether_addr_copy(batadv_ogm_packet->prev_sender,
 381                         hard_iface->net_dev->dev_addr);
 382 }
 383
 384 static void
 385 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 386 {
 387         struct batadv_ogm_packet *batadv_ogm_packet;
 388         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 389
 390         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 391         batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
 392         batadv_ogm_packet->ttl = BATADV_TTL;
 393 }
 394
 395 /* when do we schedule our own ogm to be sent */
 396 static unsigned long
 397 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 398 {
 399         unsigned int msecs;
 400
 401         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 402         msecs += prandom_u32() % (2 * BATADV_JITTER);
 403
 404         return jiffies + msecs_to_jiffies(msecs);
 405 }
 406
 407 /* when do we schedule a ogm packet to be sent */
 408 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 409 {
 410         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 411 }
 412
 413 /* apply hop penalty for a normal link */
 414 static uint8_t batadv_hop_penalty(uint8_t tq,
 415                                   const struct batadv_priv *bat_priv)
 416 {
 417         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 418         int new_tq;
 419
 420         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 421         new_tq /= BATADV_TQ_MAX_VALUE;
 422
 423         return new_tq;
 424 }
 425
 426 /* is there another aggregated packet here? */
 427 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 428                                       __be16 tvlv_len)
 429 {
 430         int next_buff_pos = 0;
 431
 432         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 433         next_buff_pos += ntohs(tvlv_len);
 434
 435         return (next_buff_pos <= packet_len) &&
 436                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 437 }
 438
 439 /* send a batman ogm to a given interface */
 440 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 441                                      struct batadv_hard_iface *hard_iface)
 442 {
 443         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 444         const char *fwd_str;
 445         uint8_t packet_num;
 446         int16_t buff_pos;
 447         struct batadv_ogm_packet *batadv_ogm_packet;
 448         struct sk_buff *skb;
 449         uint8_t *packet_pos;
 450
 451         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 452                 return;
 453
 454         packet_num = 0;
 455         buff_pos = 0;
 456         packet_pos = forw_packet->skb->data;
 457         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 458
 459         /* adjust all flags and log packets */
 460         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 461                                          batadv_ogm_packet->tvlv_len)) {
 462                 /* we might have aggregated direct link packets with an
 463                  * ordinary base packet
 464                  */
 465                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 466                     forw_packet->if_incoming == hard_iface)
 467                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 468                 else
 469                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 470
 471                 if (packet_num > 0 || !forw_packet->own)
 472                         fwd_str = "Forwarding";
 473                 else
 474                         fwd_str = "Sending own";
 475
 476                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 477                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 478                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 479                            batadv_ogm_packet->orig,
 480                            ntohl(batadv_ogm_packet->seqno),
 481                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 482                            ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ?
 483                             "on" : "off"),
 484                            hard_iface->net_dev->name,
 485                            hard_iface->net_dev->dev_addr);
 486
 487                 buff_pos += BATADV_OGM_HLEN;
 488                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 489                 packet_num++;
 490                 packet_pos = forw_packet->skb->data + buff_pos;
 491                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 492         }
 493
 494         /* create clone because function is called more than once */
 495         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 496         if (skb) {
 497                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 498                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 499                                    skb->len + ETH_HLEN);
 500                 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 501         }
 502 }
 503
 504 /* send a batman ogm packet */
 505 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 506 {
 507         struct net_device *soft_iface;
 508         struct batadv_priv *bat_priv;
 509         struct batadv_hard_iface *primary_if = NULL;
 510
 511         if (!forw_packet->if_incoming) {
 512                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 513                 goto out;
 514         }
 515
 516         soft_iface = forw_packet->if_incoming->soft_iface;
 517         bat_priv = netdev_priv(soft_iface);
 518
 519         if (WARN_ON(!forw_packet->if_outgoing))
 520                 goto out;
 521
 522         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 523                 goto out;
 524
 525         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 526                 goto out;
 527
 528         primary_if = batadv_primary_if_get_selected(bat_priv);
 529         if (!primary_if)
 530                 goto out;
 531
 532         /* only for one specific outgoing interface */
 533         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 534
 535 out:
 536         if (primary_if)
 537                 batadv_hardif_free_ref(primary_if);
 538 }
 539
 540 /**
 541  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 542  *  existing forward packet
 543  * @new_bat_ogm_packet: OGM packet to be aggregated
 544  * @bat_priv: the bat priv with all the soft interface information
 545  * @packet_len: (total) length of the OGM
 546  * @send_time: timestamp (jiffies) when the packet is to be sent
 547  * @directlink: true if this is a direct link packet
 548  * @if_incoming: interface where the packet was received
 549  * @if_outgoing: interface for which the retransmission should be considered
 550  * @forw_packet: the forwarded packet which should be checked
 551  *
 552  * Returns true if new_packet can be aggregated with forw_packet
 553  */
 554 static bool
 555 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 556                             struct batadv_priv *bat_priv,
 557                             int packet_len, unsigned long send_time,
 558                             bool directlink,
 559                             const struct batadv_hard_iface *if_incoming,
 560                             const struct batadv_hard_iface *if_outgoing,
 561                             const struct batadv_forw_packet *forw_packet)
 562 {
 563         struct batadv_ogm_packet *batadv_ogm_packet;
 564         int aggregated_bytes = forw_packet->packet_len + packet_len;
 565         struct batadv_hard_iface *primary_if = NULL;
 566         bool res = false;
 567         unsigned long aggregation_end_time;
 568
 569         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 570         aggregation_end_time = send_time;
 571         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 572
 573         /* we can aggregate the current packet to this aggregated packet
 574          * if:
 575          *
 576          * - the send time is within our MAX_AGGREGATION_MS time
 577          * - the resulting packet wont be bigger than
 578          *   MAX_AGGREGATION_BYTES
 579          * otherwise aggregation is not possible
 580          */
 581         if (!time_before(send_time, forw_packet->send_time) ||
 582             !time_after_eq(aggregation_end_time, forw_packet->send_time))
 583                 return false;
 584
 585         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
 586                 return false;
 587
 588         /* packet is not leaving on the same interface. */
 589         if (forw_packet->if_outgoing != if_outgoing)
 590                 return false;
 591
 592         /* check aggregation compatibility
 593          * -> direct link packets are broadcasted on
 594          *    their interface only
 595          * -> aggregate packet if the current packet is
 596          *    a "global" packet as well as the base
 597          *    packet
 598          */
 599         primary_if = batadv_primary_if_get_selected(bat_priv);
 600         if (!primary_if)
 601                 return false;
 602
 603         /* packets without direct link flag and high TTL
 604          * are flooded through the net
 605          */
 606         if (!directlink &&
 607             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
 608             batadv_ogm_packet->ttl != 1 &&
 609
 610             /* own packets originating non-primary
 611              * interfaces leave only that interface
 612              */
 613             (!forw_packet->own ||
 614              forw_packet->if_incoming == primary_if)) {
 615                 res = true;
 616                 goto out;
 617         }
 618
 619         /* if the incoming packet is sent via this one
 620          * interface only - we still can aggregate
 621          */
 622         if (directlink &&
 623             new_bat_ogm_packet->ttl == 1 &&
 624             forw_packet->if_incoming == if_incoming &&
 625
 626             /* packets from direct neighbors or
 627              * own secondary interface packets
 628              * (= secondary interface packets in general)
 629              */
 630             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 631              (forw_packet->own &&
 632               forw_packet->if_incoming != primary_if))) {
 633                 res = true;
 634                 goto out;
 635         }
 636
 637 out:
 638         if (primary_if)
 639                 batadv_hardif_free_ref(primary_if);
 640         return res;
 641 }
 642
 643 /**
 644  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
 645  *  packet to it.
 646  * @packet_buff: pointer to the OGM
 647  * @packet_len: (total) length of the OGM
 648  * @send_time: timestamp (jiffies) when the packet is to be sent
 649  * @direct_link: whether this OGM has direct link status
 650  * @if_incoming: interface where the packet was received
 651  * @if_outgoing: interface for which the retransmission should be considered
 652  * @own_packet: true if it is a self-generated ogm
 653  */
 654 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 655                                         int packet_len, unsigned long send_time,
 656                                         bool direct_link,
 657                                         struct batadv_hard_iface *if_incoming,
 658                                         struct batadv_hard_iface *if_outgoing,
 659                                         int own_packet)
 660 {
 661         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 662         struct batadv_forw_packet *forw_packet_aggr;
 663         unsigned char *skb_buff;
 664         unsigned int skb_size;
 665
 666         if (!atomic_inc_not_zero(&if_incoming->refcount))
 667                 return;
 668
 669         if (!atomic_inc_not_zero(&if_outgoing->refcount))
 670                 goto out_free_incoming;
 671
 672         /* own packet should always be scheduled */
 673         if (!own_packet) {
 674                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 675                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 676                                    "batman packet queue full\n");
 677                         goto out_free_outgoing;
 678                 }
 679         }
 680
 681         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 682         if (!forw_packet_aggr)
 683                 goto out_nomem;
 684
 685         if (atomic_read(&bat_priv->aggregated_ogms) &&
 686             packet_len < BATADV_MAX_AGGREGATION_BYTES)
 687                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 688         else
 689                 skb_size = packet_len;
 690
 691         skb_size += ETH_HLEN;
 692
 693         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 694         if (!forw_packet_aggr->skb)
 695                 goto out_free_forw_packet;
 696         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 697         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 698
 699         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 700         forw_packet_aggr->packet_len = packet_len;
 701         memcpy(skb_buff, packet_buff, packet_len);
 702
 703         forw_packet_aggr->own = own_packet;
 704         forw_packet_aggr->if_incoming = if_incoming;
 705         forw_packet_aggr->if_outgoing = if_outgoing;
 706         forw_packet_aggr->num_packets = 0;
 707         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 708         forw_packet_aggr->send_time = send_time;
 709
 710         /* save packet direct link flag status */
 711         if (direct_link)
 712                 forw_packet_aggr->direct_link_flags |= 1;
 713
 714         /* add new packet to packet list */
 715         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 716         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 717         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 718
 719         /* start timer for this packet */
 720         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 721                           batadv_send_outstanding_bat_ogm_packet);
 722         queue_delayed_work(batadv_event_workqueue,
 723                            &forw_packet_aggr->delayed_work,
 724                            send_time - jiffies);
 725
 726         return;
 727 out_free_forw_packet:
 728         kfree(forw_packet_aggr);
 729 out_nomem:
 730         if (!own_packet)
 731                 atomic_inc(&bat_priv->batman_queue_left);
 732 out_free_outgoing:
 733         batadv_hardif_free_ref(if_outgoing);
 734 out_free_incoming:
 735         batadv_hardif_free_ref(if_incoming);
 736 }
 737
 738 /* aggregate a new packet into the existing ogm packet */
 739 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 740                                     const unsigned char *packet_buff,
 741                                     int packet_len, bool direct_link)
 742 {
 743         unsigned char *skb_buff;
 744         unsigned long new_direct_link_flag;
 745
 746         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 747         memcpy(skb_buff, packet_buff, packet_len);
 748         forw_packet_aggr->packet_len += packet_len;
 749         forw_packet_aggr->num_packets++;
 750
 751         /* save packet direct link flag status */
 752         if (direct_link) {
 753                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 754                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 755         }
 756 }
 757
 758 /**
 759  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 760  * @bat_priv: the bat priv with all the soft interface information
 761  * @packet_buff: pointer to the OGM
 762  * @packet_len: (total) length of the OGM
 763  * @if_incoming: interface where the packet was received
 764  * @if_outgoing: interface for which the retransmission should be considered
 765  * @own_packet: true if it is a self-generated ogm
 766  * @send_time: timestamp (jiffies) when the packet is to be sent
 767  */
 768 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 769                                     unsigned char *packet_buff,
 770                                     int packet_len,
 771                                     struct batadv_hard_iface *if_incoming,
 772                                     struct batadv_hard_iface *if_outgoing,
 773                                     int own_packet, unsigned long send_time)
 774 {
 775         /* _aggr -> pointer to the packet we want to aggregate with
 776          * _pos -> pointer to the position in the queue
 777          */
 778         struct batadv_forw_packet *forw_packet_aggr = NULL;
 779         struct batadv_forw_packet *forw_packet_pos = NULL;
 780         struct batadv_ogm_packet *batadv_ogm_packet;
 781         bool direct_link;
 782         unsigned long max_aggregation_jiffies;
 783
 784         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 785         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 786         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 787
 788         /* find position for the packet in the forward queue */
 789         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 790         /* own packets are not to be aggregated */
 791         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 792                 hlist_for_each_entry(forw_packet_pos,
 793                                      &bat_priv->forw_bat_list, list) {
 794                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 795                                                         bat_priv, packet_len,
 796                                                         send_time, direct_link,
 797                                                         if_incoming,
 798                                                         if_outgoing,
 799                                                         forw_packet_pos)) {
 800                                 forw_packet_aggr = forw_packet_pos;
 801                                 break;
 802                         }
 803                 }
 804         }
 805
 806         /* nothing to aggregate with - either aggregation disabled or no
 807          * suitable aggregation packet found
 808          */
 809         if (!forw_packet_aggr) {
 810                 /* the following section can run without the lock */
 811                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 812
 813                 /* if we could not aggregate this packet with one of the others
 814                  * we hold it back for a while, so that it might be aggregated
 815                  * later on
 816                  */
 817                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 818                         send_time += max_aggregation_jiffies;
 819
 820                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 821                                             send_time, direct_link,
 822                                             if_incoming, if_outgoing,
 823                                             own_packet);
 824         } else {
 825                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 826                                         packet_len, direct_link);
 827                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 828         }
 829 }
 830
 831 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 832                                   const struct ethhdr *ethhdr,
 833                                   struct batadv_ogm_packet *batadv_ogm_packet,
 834                                   bool is_single_hop_neigh,
 835                                   bool is_from_best_next_hop,
 836                                   struct batadv_hard_iface *if_incoming,
 837                                   struct batadv_hard_iface *if_outgoing)
 838 {
 839         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 840         uint16_t tvlv_len;
 841
 842         if (batadv_ogm_packet->ttl <= 1) {
 843                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 844                 return;
 845         }
 846
 847         if (!is_from_best_next_hop) {
 848                 /* Mark the forwarded packet when it is not coming from our
 849                  * best next hop. We still need to forward the packet for our
 850                  * neighbor link quality detection to work in case the packet
 851                  * originated from a single hop neighbor. Otherwise we can
 852                  * simply drop the ogm.
 853                  */
 854                 if (is_single_hop_neigh)
 855                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 856                 else
 857                         return;
 858         }
 859
 860         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 861
 862         batadv_ogm_packet->ttl--;
 863         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 864
 865         /* apply hop penalty */
 866         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 867                                                    bat_priv);
 868
 869         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 870                    "Forwarding packet: tq: %i, ttl: %i\n",
 871                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 872
 873         /* switch of primaries first hop flag when forwarding */
 874         batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
 875         if (is_single_hop_neigh)
 876                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 877         else
 878                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 879
 880         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 881                                 BATADV_OGM_HLEN + tvlv_len,
 882                                 if_incoming, if_outgoing, 0,
 883                                 batadv_iv_ogm_fwd_send_time());
 884 }
 885
 886 /**
 887  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 888  * the given interface
 889  * @hard_iface: the interface for which the windows have to be shifted
 890  */
 891 static void
 892 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 893 {
 894         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 895         struct batadv_hashtable *hash = bat_priv->orig_hash;
 896         struct hlist_head *head;
 897         struct batadv_orig_node *orig_node;
 898         unsigned long *word;
 899         uint32_t i;
 900         size_t word_index;
 901         uint8_t *w;
 902         int if_num;
 903
 904         for (i = 0; i < hash->size; i++) {
 905                 head = &hash->table[i];
 906
 907                 rcu_read_lock();
 908                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 909                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 910                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 911                         word = &orig_node->bat_iv.bcast_own[word_index];
 912
 913                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 914                         if_num = hard_iface->if_num;
 915                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 916                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 917                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 918                 }
 919                 rcu_read_unlock();
 920         }
 921 }
 922
 923 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 924 {
 925         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 926         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 927         struct batadv_ogm_packet *batadv_ogm_packet;
 928         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 929         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 930         uint32_t seqno;
 931         uint16_t tvlv_len = 0;
 932         unsigned long send_time;
 933
 934         primary_if = batadv_primary_if_get_selected(bat_priv);
 935
 936         if (hard_iface == primary_if) {
 937                 /* tt changes have to be committed before the tvlv data is
 938                  * appended as it may alter the tt tvlv container
 939                  */
 940                 batadv_tt_local_commit_changes(bat_priv);
 941                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 942                                                             ogm_buff_len,
 943                                                             BATADV_OGM_HLEN);
 944         }
 945
 946         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 947         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 948
 949         /* change sequence number to network order */
 950         seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 951         batadv_ogm_packet->seqno = htonl(seqno);
 952         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 953
 954         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 955
 956         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 957
 958         if (hard_iface != primary_if) {
 959                 /* OGMs from secondary interfaces are only scheduled on their
 960                  * respective interfaces.
 961                  */
 962                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 963                                         hard_iface, hard_iface, 1, send_time);
 964                 goto out;
 965         }
 966
 967         /* OGMs from primary interfaces are scheduled on all
 968          * interfaces.
 969          */
 970         rcu_read_lock();
 971         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 972                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 973                                 continue;
 974                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 975                                         *ogm_buff_len, hard_iface,
 976                                         tmp_hard_iface, 1, send_time);
 977         }
 978         rcu_read_unlock();
 979
 980 out:
 981         if (primary_if)
 982                 batadv_hardif_free_ref(primary_if);
 983 }
 984
 985 /**
 986  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
 987  *  originator
 988  * @bat_priv: the bat priv with all the soft interface information
 989  * @orig_node: the orig node who originally emitted the ogm packet
 990  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
 991  * @ethhdr: Ethernet header of the OGM
 992  * @batadv_ogm_packet: the ogm packet
 993  * @if_incoming: interface where the packet was received
 994  * @if_outgoing: interface for which the retransmission should be considered
 995  * @dup_status: the duplicate status of this ogm packet.
 996  */
 997 static void
 998 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 999                           struct batadv_orig_node *orig_node,
1000                           struct batadv_orig_ifinfo *orig_ifinfo,
1001                           const struct ethhdr *ethhdr,
1002                           const struct batadv_ogm_packet *batadv_ogm_packet,
1003                           struct batadv_hard_iface *if_incoming,
1004                           struct batadv_hard_iface *if_outgoing,
1005                           enum batadv_dup_status dup_status)
1006 {
1007         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
1008         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1009         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
1010         struct batadv_neigh_node *router = NULL;
1011         struct batadv_orig_node *orig_node_tmp;
1012         int if_num;
1013         uint8_t sum_orig, sum_neigh;
1014         uint8_t *neigh_addr;
1015         uint8_t tq_avg;
1016
1017         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1018                    "update_originator(): Searching and updating originator entry of received packet\n");
1019
1020         rcu_read_lock();
1021         hlist_for_each_entry_rcu(tmp_neigh_node,
1022                                  &orig_node->neigh_list, list) {
1023                 neigh_addr = tmp_neigh_node->addr;
1024                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1025                     tmp_neigh_node->if_incoming == if_incoming &&
1026                     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
1027                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1028                                 batadv_neigh_node_free_ref(neigh_node);
1029                         neigh_node = tmp_neigh_node;
1030                         continue;
1031                 }
1032
1033                 if (dup_status != BATADV_NO_DUP)
1034                         continue;
1035
1036                 /* only update the entry for this outgoing interface */
1037                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1038                                                        if_outgoing);
1039                 if (!neigh_ifinfo)
1040                         continue;
1041
1042                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1043                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1044                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1045                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1046                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1047                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1048
1049                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1050                 neigh_ifinfo = NULL;
1051         }
1052
1053         if (!neigh_node) {
1054                 struct batadv_orig_node *orig_tmp;
1055
1056                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1057                 if (!orig_tmp)
1058                         goto unlock;
1059
1060                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1061                                                      ethhdr->h_source,
1062                                                      orig_node, orig_tmp);
1063
1064                 batadv_orig_node_free_ref(orig_tmp);
1065                 if (!neigh_node)
1066                         goto unlock;
1067         } else {
1068                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1069                            "Updating existing last-hop neighbor of originator\n");
1070         }
1071
1072         rcu_read_unlock();
1073         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1074         if (!neigh_ifinfo)
1075                 goto out;
1076
1077         neigh_node->last_seen = jiffies;
1078
1079         spin_lock_bh(&neigh_node->ifinfo_lock);
1080         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1081                                &neigh_ifinfo->bat_iv.tq_index,
1082                                batadv_ogm_packet->tq);
1083         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1084         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1085         spin_unlock_bh(&neigh_node->ifinfo_lock);
1086
1087         if (dup_status == BATADV_NO_DUP) {
1088                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1089                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1090         }
1091
1092         /* if this neighbor already is our next hop there is nothing
1093          * to change
1094          */
1095         router = batadv_orig_router_get(orig_node, if_outgoing);
1096         if (router == neigh_node)
1097                 goto out;
1098
1099         if (router) {
1100                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1101                 if (!router_ifinfo)
1102                         goto out;
1103
1104                 /* if this neighbor does not offer a better TQ we won't
1105                  * consider it
1106                  */
1107                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1108                         goto out;
1109         }
1110
1111         /* if the TQ is the same and the link not more symmetric we
1112          * won't consider it either
1113          */
1114         if (router_ifinfo &&
1115             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1116                 orig_node_tmp = router->orig_node;
1117                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1118                 if_num = router->if_incoming->if_num;
1119                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1120                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1121
1122                 orig_node_tmp = neigh_node->orig_node;
1123                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1124                 if_num = neigh_node->if_incoming->if_num;
1125                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1126                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1127
1128                 if (sum_orig >= sum_neigh)
1129                         goto out;
1130         }
1131
1132         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1133         goto out;
1134
1135 unlock:
1136         rcu_read_unlock();
1137 out:
1138         if (neigh_node)
1139                 batadv_neigh_node_free_ref(neigh_node);
1140         if (router)
1141                 batadv_neigh_node_free_ref(router);
1142         if (neigh_ifinfo)
1143                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1144         if (router_ifinfo)
1145                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1146 }
1147
1148 /**
1149  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1150  * @orig_node: the orig node who originally emitted the ogm packet
1151  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1152  * @batadv_ogm_packet: the ogm packet
1153  * @if_incoming: interface where the packet was received
1154  * @if_outgoing: interface for which the retransmission should be considered
1155  *
1156  * Returns 1 if the link can be considered bidirectional, 0 otherwise
1157  */
1158 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1159                                  struct batadv_orig_node *orig_neigh_node,
1160                                  struct batadv_ogm_packet *batadv_ogm_packet,
1161                                  struct batadv_hard_iface *if_incoming,
1162                                  struct batadv_hard_iface *if_outgoing)
1163 {
1164         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1165         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1166         struct batadv_neigh_ifinfo *neigh_ifinfo;
1167         uint8_t total_count;
1168         uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1169         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1170         int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
1171         unsigned int combined_tq;
1172         int tq_iface_penalty;
1173
1174         /* find corresponding one hop neighbor */
1175         rcu_read_lock();
1176         hlist_for_each_entry_rcu(tmp_neigh_node,
1177                                  &orig_neigh_node->neigh_list, list) {
1178                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1179                                         orig_neigh_node->orig))
1180                         continue;
1181
1182                 if (tmp_neigh_node->if_incoming != if_incoming)
1183                         continue;
1184
1185                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1186                         continue;
1187
1188                 neigh_node = tmp_neigh_node;
1189                 break;
1190         }
1191         rcu_read_unlock();
1192
1193         if (!neigh_node)
1194                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1195                                                      orig_neigh_node->orig,
1196                                                      orig_neigh_node,
1197                                                      orig_neigh_node);
1198
1199         if (!neigh_node)
1200                 goto out;
1201
1202         /* if orig_node is direct neighbor update neigh_node last_seen */
1203         if (orig_node == orig_neigh_node)
1204                 neigh_node->last_seen = jiffies;
1205
1206         orig_node->last_seen = jiffies;
1207
1208         /* find packet count of corresponding one hop neighbor */
1209         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1210         if_num = if_incoming->if_num;
1211         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1212         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1213         if (neigh_ifinfo) {
1214                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1215                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1216         } else {
1217                 neigh_rq_count = 0;
1218         }
1219         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1220
1221         /* pay attention to not get a value bigger than 100 % */
1222         if (orig_eq_count > neigh_rq_count)
1223                 total_count = neigh_rq_count;
1224         else
1225                 total_count = orig_eq_count;
1226
1227         /* if we have too few packets (too less data) we set tq_own to zero
1228          * if we receive too few packets it is not considered bidirectional
1229          */
1230         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1231             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1232                 tq_own = 0;
1233         else
1234                 /* neigh_node->real_packet_count is never zero as we
1235                  * only purge old information when getting new
1236                  * information
1237                  */
1238                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1239
1240         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1241          * affect the nearly-symmetric links only a little, but
1242          * punishes asymmetric links more.  This will give a value
1243          * between 0 and TQ_MAX_VALUE
1244          */
1245         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1246         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1247         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1248                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1249                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1250         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1251         inv_asym_penalty /= neigh_rq_max_cube;
1252         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1253
1254         /* penalize if the OGM is forwarded on the same interface. WiFi
1255          * interfaces and other half duplex devices suffer from throughput
1256          * drops as they can't send and receive at the same time.
1257          */
1258         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1259         if (if_outgoing && (if_incoming == if_outgoing) &&
1260             batadv_is_wifi_netdev(if_outgoing->net_dev))
1261                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1262                                                       bat_priv);
1263
1264         combined_tq = batadv_ogm_packet->tq *
1265                       tq_own *
1266                       tq_asym_penalty *
1267                       tq_iface_penalty;
1268         combined_tq /= BATADV_TQ_MAX_VALUE *
1269                        BATADV_TQ_MAX_VALUE *
1270                        BATADV_TQ_MAX_VALUE;
1271         batadv_ogm_packet->tq = combined_tq;
1272
1273         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1274                    "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",
1275                    orig_node->orig, orig_neigh_node->orig, total_count,
1276                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1277                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1278                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1279
1280         /* if link has the minimum required transmission quality
1281          * consider it bidirectional
1282          */
1283         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1284                 ret = 1;
1285
1286 out:
1287         if (neigh_node)
1288                 batadv_neigh_node_free_ref(neigh_node);
1289         return ret;
1290 }
1291
1292 /**
1293  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1294  *  adjust the sequence number and find out whether it is a duplicate
1295  * @ethhdr: ethernet header of the packet
1296  * @batadv_ogm_packet: OGM packet to be considered
1297  * @if_incoming: interface on which the OGM packet was received
1298  * @if_outgoing: interface for which the retransmission should be considered
1299  *
1300  * Returns duplicate status as enum batadv_dup_status
1301  */
1302 static enum batadv_dup_status
1303 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1304                             const struct batadv_ogm_packet *batadv_ogm_packet,
1305                             const struct batadv_hard_iface *if_incoming,
1306                             struct batadv_hard_iface *if_outgoing)
1307 {
1308         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1309         struct batadv_orig_node *orig_node;
1310         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1311         struct batadv_neigh_node *neigh_node;
1312         struct batadv_neigh_ifinfo *neigh_ifinfo;
1313         int is_dup;
1314         int32_t seq_diff;
1315         int need_update = 0;
1316         int set_mark;
1317         enum batadv_dup_status ret = BATADV_NO_DUP;
1318         uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
1319         uint8_t *neigh_addr;
1320         uint8_t packet_count;
1321         unsigned long *bitmap;
1322
1323         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1324         if (!orig_node)
1325                 return BATADV_NO_DUP;
1326
1327         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1328         if (WARN_ON(!orig_ifinfo)) {
1329                 batadv_orig_node_free_ref(orig_node);
1330                 return 0;
1331         }
1332
1333         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1334         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1335
1336         /* signalize caller that the packet is to be dropped. */
1337         if (!hlist_empty(&orig_node->neigh_list) &&
1338             batadv_window_protected(bat_priv, seq_diff,
1339                                     &orig_ifinfo->batman_seqno_reset)) {
1340                 ret = BATADV_PROTECTED;
1341                 goto out;
1342         }
1343
1344         rcu_read_lock();
1345         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1346                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1347                                                        if_outgoing);
1348                 if (!neigh_ifinfo)
1349                         continue;
1350
1351                 neigh_addr = neigh_node->addr;
1352                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1353                                          orig_ifinfo->last_real_seqno,
1354                                          seqno);
1355
1356                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1357                     neigh_node->if_incoming == if_incoming) {
1358                         set_mark = 1;
1359                         if (is_dup)
1360                                 ret = BATADV_NEIGH_DUP;
1361                 } else {
1362                         set_mark = 0;
1363                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1364                                 ret = BATADV_ORIG_DUP;
1365                 }
1366
1367                 /* if the window moved, set the update flag. */
1368                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1369                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1370                                                      seq_diff, set_mark);
1371
1372                 packet_count = bitmap_weight(bitmap,
1373                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1374                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1375                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1376         }
1377         rcu_read_unlock();
1378
1379         if (need_update) {
1380                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1381                            "%s updating last_seqno: old %u, new %u\n",
1382                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1383                            orig_ifinfo->last_real_seqno, seqno);
1384                 orig_ifinfo->last_real_seqno = seqno;
1385         }
1386
1387 out:
1388         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1389         batadv_orig_node_free_ref(orig_node);
1390         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1391         return ret;
1392 }
1393
1394 /**
1395  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1396  * @skb: the skb containing the OGM
1397  * @ogm_offset: offset from skb->data to start of ogm header
1398  * @orig_node: the (cached) orig node for the originator of this OGM
1399  * @if_incoming: the interface where this packet was received
1400  * @if_outgoing: the interface for which the packet should be considered
1401  */
1402 static void
1403 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1404                                 struct batadv_orig_node *orig_node,
1405                                 struct batadv_hard_iface *if_incoming,
1406                                 struct batadv_hard_iface *if_outgoing)
1407 {
1408         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1409         struct batadv_neigh_node *router = NULL, *router_router = NULL;
1410         struct batadv_orig_node *orig_neigh_node;
1411         struct batadv_orig_ifinfo *orig_ifinfo;
1412         struct batadv_neigh_node *orig_neigh_router = NULL;
1413         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1414         struct batadv_ogm_packet *ogm_packet;
1415         enum batadv_dup_status dup_status;
1416         bool is_from_best_next_hop = false;
1417         bool is_single_hop_neigh = false;
1418         bool sameseq, similar_ttl;
1419         struct sk_buff *skb_priv;
1420         struct ethhdr *ethhdr;
1421         uint8_t *prev_sender;
1422         int is_bidirect;
1423
1424         /* create a private copy of the skb, as some functions change tq value
1425          * and/or flags.
1426          */
1427         skb_priv = skb_copy(skb, GFP_ATOMIC);
1428         if (!skb_priv)
1429                 return;
1430
1431         ethhdr = eth_hdr(skb_priv);
1432         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1433
1434         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1435                                                  if_incoming, if_outgoing);
1436         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1437                 is_single_hop_neigh = true;
1438
1439         if (dup_status == BATADV_PROTECTED) {
1440                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1441                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1442                            ethhdr->h_source);
1443                 goto out;
1444         }
1445
1446         if (ogm_packet->tq == 0) {
1447                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1448                            "Drop packet: originator packet with tq equal 0\n");
1449                 goto out;
1450         }
1451
1452         router = batadv_orig_router_get(orig_node, if_outgoing);
1453         if (router) {
1454                 router_router = batadv_orig_router_get(router->orig_node,
1455                                                        if_outgoing);
1456                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1457         }
1458
1459         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1460             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1461                 is_from_best_next_hop = true;
1462
1463         prev_sender = ogm_packet->prev_sender;
1464         /* avoid temporary routing loops */
1465         if (router && router_router &&
1466             (batadv_compare_eth(router->addr, prev_sender)) &&
1467             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1468             (batadv_compare_eth(router->addr, router_router->addr))) {
1469                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1470                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1471                            ethhdr->h_source);
1472                 goto out;
1473         }
1474
1475         if (if_outgoing == BATADV_IF_DEFAULT)
1476                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1477
1478         /* if sender is a direct neighbor the sender mac equals
1479          * originator mac
1480          */
1481         if (is_single_hop_neigh)
1482                 orig_neigh_node = orig_node;
1483         else
1484                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1485                                                          ethhdr->h_source);
1486
1487         if (!orig_neigh_node)
1488                 goto out;
1489
1490         /* Update nc_nodes of the originator */
1491         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1492                                  ogm_packet, is_single_hop_neigh);
1493
1494         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1495                                                    if_outgoing);
1496
1497         /* drop packet if sender is not a direct neighbor and if we
1498          * don't route towards it
1499          */
1500         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1501                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1502                            "Drop packet: OGM via unknown neighbor!\n");
1503                 goto out_neigh;
1504         }
1505
1506         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1507                                             ogm_packet, if_incoming,
1508                                             if_outgoing);
1509
1510         /* update ranking if it is not a duplicate or has the same
1511          * seqno and similar ttl as the non-duplicate
1512          */
1513         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1514         if (!orig_ifinfo)
1515                 goto out_neigh;
1516
1517         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1518         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1519
1520         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1521                             (sameseq && similar_ttl))) {
1522                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1523                                           orig_ifinfo, ethhdr,
1524                                           ogm_packet, if_incoming,
1525                                           if_outgoing, dup_status);
1526         }
1527         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1528
1529         /* only forward for specific interface, not for the default one. */
1530         if (if_outgoing == BATADV_IF_DEFAULT)
1531                 goto out_neigh;
1532
1533         /* is single hop (direct) neighbor */
1534         if (is_single_hop_neigh) {
1535                 /* OGMs from secondary interfaces should only scheduled once
1536                  * per interface where it has been received, not multiple times
1537                  */
1538                 if ((ogm_packet->ttl <= 2) &&
1539                     (if_incoming != if_outgoing)) {
1540                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1541                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1542                         goto out_neigh;
1543                 }
1544                 /* mark direct link on incoming interface */
1545                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1546                                       is_single_hop_neigh,
1547                                       is_from_best_next_hop, if_incoming,
1548                                       if_outgoing);
1549
1550                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1551                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1552                 goto out_neigh;
1553         }
1554
1555         /* multihop originator */
1556         if (!is_bidirect) {
1557                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1558                            "Drop packet: not received via bidirectional link\n");
1559                 goto out_neigh;
1560         }
1561
1562         if (dup_status == BATADV_NEIGH_DUP) {
1563                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1564                            "Drop packet: duplicate packet received\n");
1565                 goto out_neigh;
1566         }
1567
1568         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1569                    "Forwarding packet: rebroadcast originator packet\n");
1570         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1571                               is_single_hop_neigh, is_from_best_next_hop,
1572                               if_incoming, if_outgoing);
1573
1574 out_neigh:
1575         if ((orig_neigh_node) && (!is_single_hop_neigh))
1576                 batadv_orig_node_free_ref(orig_neigh_node);
1577 out:
1578         if (router_ifinfo)
1579                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1580         if (router)
1581                 batadv_neigh_node_free_ref(router);
1582         if (router_router)
1583                 batadv_neigh_node_free_ref(router_router);
1584         if (orig_neigh_router)
1585                 batadv_neigh_node_free_ref(orig_neigh_router);
1586
1587         kfree_skb(skb_priv);
1588 }
1589
1590 /**
1591  * batadv_iv_ogm_process - process an incoming batman iv OGM
1592  * @skb: the skb containing the OGM
1593  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1594  * @if_incoming: the interface where this packet was receved
1595  */
1596 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1597                                   struct batadv_hard_iface *if_incoming)
1598 {
1599         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1600         struct batadv_orig_node *orig_neigh_node, *orig_node;
1601         struct batadv_hard_iface *hard_iface;
1602         struct batadv_ogm_packet *ogm_packet;
1603         uint32_t if_incoming_seqno;
1604         bool has_directlink_flag;
1605         struct ethhdr *ethhdr;
1606         bool is_my_oldorig = false;
1607         bool is_my_addr = false;
1608         bool is_my_orig = false;
1609
1610         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1611         ethhdr = eth_hdr(skb);
1612
1613         /* Silently drop when the batman packet is actually not a
1614          * correct packet.
1615          *
1616          * This might happen if a packet is padded (e.g. Ethernet has a
1617          * minimum frame length of 64 byte) and the aggregation interprets
1618          * it as an additional length.
1619          *
1620          * TODO: A more sane solution would be to have a bit in the
1621          * batadv_ogm_packet to detect whether the packet is the last
1622          * packet in an aggregation.  Here we expect that the padding
1623          * is always zero (or not 0x01)
1624          */
1625         if (ogm_packet->packet_type != BATADV_IV_OGM)
1626                 return;
1627
1628         /* could be changed by schedule_own_packet() */
1629         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1630
1631         if (ogm_packet->flags & BATADV_DIRECTLINK)
1632                 has_directlink_flag = true;
1633         else
1634                 has_directlink_flag = false;
1635
1636         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1637                    "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",
1638                    ethhdr->h_source, if_incoming->net_dev->name,
1639                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1640                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1641                    ogm_packet->tq, ogm_packet->ttl,
1642                    ogm_packet->version, has_directlink_flag);
1643
1644         rcu_read_lock();
1645         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1646                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1647                         continue;
1648
1649                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1650                         continue;
1651
1652                 if (batadv_compare_eth(ethhdr->h_source,
1653                                        hard_iface->net_dev->dev_addr))
1654                         is_my_addr = true;
1655
1656                 if (batadv_compare_eth(ogm_packet->orig,
1657                                        hard_iface->net_dev->dev_addr))
1658                         is_my_orig = true;
1659
1660                 if (batadv_compare_eth(ogm_packet->prev_sender,
1661                                        hard_iface->net_dev->dev_addr))
1662                         is_my_oldorig = true;
1663         }
1664         rcu_read_unlock();
1665
1666         if (is_my_addr) {
1667                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1668                            "Drop packet: received my own broadcast (sender: %pM)\n",
1669                            ethhdr->h_source);
1670                 return;
1671         }
1672
1673         if (is_my_orig) {
1674                 unsigned long *word;
1675                 int offset;
1676                 int32_t bit_pos;
1677                 int16_t if_num;
1678                 uint8_t *weight;
1679
1680                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1681                                                          ethhdr->h_source);
1682                 if (!orig_neigh_node)
1683                         return;
1684
1685                 /* neighbor has to indicate direct link and it has to
1686                  * come via the corresponding interface
1687                  * save packet seqno for bidirectional check
1688                  */
1689                 if (has_directlink_flag &&
1690                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1691                                        ogm_packet->orig)) {
1692                         if_num = if_incoming->if_num;
1693                         offset = if_num * BATADV_NUM_WORDS;
1694
1695                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1696                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1697                         bit_pos = if_incoming_seqno - 2;
1698                         bit_pos -= ntohl(ogm_packet->seqno);
1699                         batadv_set_bit(word, bit_pos);
1700                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1701                         *weight = bitmap_weight(word,
1702                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1703                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1704                 }
1705
1706                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1707                            "Drop packet: originator packet from myself (via neighbor)\n");
1708                 batadv_orig_node_free_ref(orig_neigh_node);
1709                 return;
1710         }
1711
1712         if (is_my_oldorig) {
1713                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1714                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1715                            ethhdr->h_source);
1716                 return;
1717         }
1718
1719         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1720                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1721                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1722                            ethhdr->h_source);
1723                 return;
1724         }
1725
1726         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1727         if (!orig_node)
1728                 return;
1729
1730         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1731                                         if_incoming, BATADV_IF_DEFAULT);
1732
1733         rcu_read_lock();
1734         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1735                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1736                         continue;
1737
1738                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1739                         continue;
1740
1741                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1742                                                 if_incoming, hard_iface);
1743         }
1744         rcu_read_unlock();
1745
1746         batadv_orig_node_free_ref(orig_node);
1747 }
1748
1749 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1750                                  struct batadv_hard_iface *if_incoming)
1751 {
1752         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1753         struct batadv_ogm_packet *ogm_packet;
1754         uint8_t *packet_pos;
1755         int ogm_offset;
1756         bool ret;
1757
1758         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1759         if (!ret)
1760                 return NET_RX_DROP;
1761
1762         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1763          * that does not have B.A.T.M.A.N. IV enabled ?
1764          */
1765         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1766                 return NET_RX_DROP;
1767
1768         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1769         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1770                            skb->len + ETH_HLEN);
1771
1772         ogm_offset = 0;
1773         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1774
1775         /* unpack the aggregated packets and process them one by one */
1776         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1777                                          ogm_packet->tvlv_len)) {
1778                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1779
1780                 ogm_offset += BATADV_OGM_HLEN;
1781                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1782
1783                 packet_pos = skb->data + ogm_offset;
1784                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1785         }
1786
1787         kfree_skb(skb);
1788         return NET_RX_SUCCESS;
1789 }
1790
1791 /**
1792  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1793  * @orig_node: the orig_node for which the neighbors are printed
1794  * @if_outgoing: outgoing interface for these entries
1795  * @seq: debugfs table seq_file struct
1796  *
1797  * Must be called while holding an rcu lock.
1798  */
1799 static void
1800 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1801                                struct batadv_hard_iface *if_outgoing,
1802                                struct seq_file *seq)
1803 {
1804         struct batadv_neigh_node *neigh_node;
1805         struct batadv_neigh_ifinfo *n_ifinfo;
1806
1807         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1808                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1809                 if (!n_ifinfo)
1810                         continue;
1811
1812                 seq_printf(seq, " %pM (%3i)",
1813                            neigh_node->addr,
1814                            n_ifinfo->bat_iv.tq_avg);
1815
1816                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1817         }
1818 }
1819
1820 /**
1821  * batadv_iv_ogm_orig_print - print the originator table
1822  * @bat_priv: the bat priv with all the soft interface information
1823  * @seq: debugfs table seq_file struct
1824  * @if_outgoing: the outgoing interface for which this should be printed
1825  */
1826 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1827                                      struct seq_file *seq,
1828                                      struct batadv_hard_iface *if_outgoing)
1829 {
1830         struct batadv_neigh_node *neigh_node;
1831         struct batadv_hashtable *hash = bat_priv->orig_hash;
1832         int last_seen_msecs, last_seen_secs;
1833         struct batadv_orig_node *orig_node;
1834         struct batadv_neigh_ifinfo *n_ifinfo;
1835         unsigned long last_seen_jiffies;
1836         struct hlist_head *head;
1837         int batman_count = 0;
1838         uint32_t i;
1839
1840         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1841                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1842                    "Nexthop", "outgoingIF", "Potential nexthops");
1843
1844         for (i = 0; i < hash->size; i++) {
1845                 head = &hash->table[i];
1846
1847                 rcu_read_lock();
1848                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1849                         neigh_node = batadv_orig_router_get(orig_node,
1850                                                             if_outgoing);
1851                         if (!neigh_node)
1852                                 continue;
1853
1854                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1855                                                            if_outgoing);
1856                         if (!n_ifinfo)
1857                                 goto next;
1858
1859                         if (n_ifinfo->bat_iv.tq_avg == 0)
1860                                 goto next;
1861
1862                         last_seen_jiffies = jiffies - orig_node->last_seen;
1863                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1864                         last_seen_secs = last_seen_msecs / 1000;
1865                         last_seen_msecs = last_seen_msecs % 1000;
1866
1867                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1868                                    orig_node->orig, last_seen_secs,
1869                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1870                                    neigh_node->addr,
1871                                    neigh_node->if_incoming->net_dev->name);
1872
1873                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1874                                                        seq);
1875                         seq_puts(seq, "\n");
1876                         batman_count++;
1877
1878 next:
1879                         batadv_neigh_node_free_ref(neigh_node);
1880                         if (n_ifinfo)
1881                                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1882                 }
1883                 rcu_read_unlock();
1884         }
1885
1886         if (batman_count == 0)
1887                 seq_puts(seq, "No batman nodes in range ...\n");
1888 }
1889
1890 /**
1891  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1892  * @neigh1: the first neighbor object of the comparison
1893  * @if_outgoing1: outgoing interface for the first neighbor
1894  * @neigh2: the second neighbor object of the comparison
1895  * @if_outgoing2: outgoing interface for the second neighbor
1896  *
1897  * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1898  * lower, the same as or higher than the metric via neigh2
1899  */
1900 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1901                                    struct batadv_hard_iface *if_outgoing1,
1902                                    struct batadv_neigh_node *neigh2,
1903                                    struct batadv_hard_iface *if_outgoing2)
1904 {
1905         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1906         uint8_t tq1, tq2;
1907         int diff;
1908
1909         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1910         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1911
1912         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1913                 diff = 0;
1914                 goto out;
1915         }
1916
1917         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1918         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1919         diff = tq1 - tq2;
1920
1921 out:
1922         if (neigh1_ifinfo)
1923                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1924         if (neigh2_ifinfo)
1925                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1926
1927         return diff;
1928 }
1929
1930 /**
1931  * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
1932  *  neigh2 from the metric prospective
1933  * @neigh1: the first neighbor object of the comparison
1934  * @if_outgoing1: outgoing interface for the first neighbor
1935  * @neigh2: the second neighbor object of the comparison
1936  * @if_outgoing2: outgoing interface for the second neighbor
1937  *
1938  * Returns true if the metric via neigh1 is equally good or better than
1939  * the metric via neigh2, false otherwise.
1940  */
1941 static bool
1942 batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1,
1943                            struct batadv_hard_iface *if_outgoing1,
1944                            struct batadv_neigh_node *neigh2,
1945                            struct batadv_hard_iface *if_outgoing2)
1946 {
1947         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1948         uint8_t tq1, tq2;
1949         bool ret;
1950
1951         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1952         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1953
1954         /* we can't say that the metric is better */
1955         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1956                 ret = false;
1957                 goto out;
1958         }
1959
1960         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1961         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1962         ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
1963
1964 out:
1965         if (neigh1_ifinfo)
1966                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1967         if (neigh2_ifinfo)
1968                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1969
1970         return ret;
1971 }
1972
1973 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1974         .name = "BATMAN_IV",
1975         .bat_iface_enable = batadv_iv_ogm_iface_enable,
1976         .bat_iface_disable = batadv_iv_ogm_iface_disable,
1977         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1978         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1979         .bat_ogm_schedule = batadv_iv_ogm_schedule,
1980         .bat_ogm_emit = batadv_iv_ogm_emit,
1981         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
1982         .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
1983         .bat_orig_print = batadv_iv_ogm_orig_print,
1984         .bat_orig_free = batadv_iv_ogm_orig_free,
1985         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
1986         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
1987 };
1988
1989 int __init batadv_iv_init(void)
1990 {
1991         int ret;
1992
1993         /* batman originator packet */
1994         ret = batadv_recv_handler_register(BATADV_IV_OGM,
1995                                            batadv_iv_ogm_receive);
1996         if (ret < 0)
1997                 goto out;
1998
1999         ret = batadv_algo_register(&batadv_batman_iv);
2000         if (ret < 0)
2001                 goto handler_unregister;
2002
2003         goto out;
2004
2005 handler_unregister:
2006         batadv_recv_handler_unregister(BATADV_IV_OGM);
2007 out:
2008         return ret;
2009 }