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(u8 lq_recv[], u8 *lq_index, u8 value)
  81 {
  82         lq_recv[*lq_index] = value;
  83         *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
  84 }
  85
  86 /**
  87  * batadv_ring_buffer_avg - compute the average of all non-zero values stored
  88  * in the given ring buffer
  89  * @lq_recv: pointer to the ring buffer
  90  *
  91  * Returns computed average value.
  92  */
  93 static u8 batadv_ring_buffer_avg(const u8 lq_recv[])
  94 {
  95         const u8 *ptr;
  96         u16 count = 0;
  97         u16 i = 0;
  98         u16 sum = 0;
  99
 100         ptr = lq_recv;
 101
 102         while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
 103                 if (*ptr != 0) {
 104                         count++;
 105                         sum += *ptr;
 106                 }
 107
 108                 i++;
 109                 ptr++;
 110         }
 111
 112         if (count == 0)
 113                 return 0;
 114
 115         return (u8)(sum / count);
 116 }
 117
 118 /**
 119  * batadv_iv_ogm_orig_free - free the private resources allocated for this
 120  *  orig_node
 121  * @orig_node: the orig_node for which the resources have to be free'd
 122  */
 123 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
 124 {
 125         kfree(orig_node->bat_iv.bcast_own);
 126         kfree(orig_node->bat_iv.bcast_own_sum);
 127 }
 128
 129 /**
 130  * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
 131  *  include the new hard-interface
 132  * @orig_node: the orig_node that has to be changed
 133  * @max_if_num: the current amount of interfaces
 134  *
 135  * Returns 0 on success, a negative error code otherwise.
 136  */
 137 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
 138                                      int max_if_num)
 139 {
 140         void *data_ptr;
 141         size_t old_size;
 142         int ret = -ENOMEM;
 143
 144         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 145
 146         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 147         data_ptr = kmalloc_array(max_if_num,
 148                                  BATADV_NUM_WORDS * sizeof(unsigned long),
 149                                  GFP_ATOMIC);
 150         if (!data_ptr)
 151                 goto unlock;
 152
 153         memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
 154         kfree(orig_node->bat_iv.bcast_own);
 155         orig_node->bat_iv.bcast_own = data_ptr;
 156
 157         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 158         if (!data_ptr) {
 159                 kfree(orig_node->bat_iv.bcast_own);
 160                 goto unlock;
 161         }
 162
 163         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 164                (max_if_num - 1) * sizeof(u8));
 165         kfree(orig_node->bat_iv.bcast_own_sum);
 166         orig_node->bat_iv.bcast_own_sum = data_ptr;
 167
 168         ret = 0;
 169
 170 unlock:
 171         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 172
 173         return ret;
 174 }
 175
 176 /**
 177  * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
 178  *  exclude the removed interface
 179  * @orig_node: the orig_node that has to be changed
 180  * @max_if_num: the current amount of interfaces
 181  * @del_if_num: the index of the interface being removed
 182  *
 183  * Returns 0 on success, a negative error code otherwise.
 184  */
 185 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
 186                                      int max_if_num, int del_if_num)
 187 {
 188         int ret = -ENOMEM;
 189         size_t chunk_size, 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         if_offset = (del_if_num + 1) * chunk_size;
 208         memcpy((char *)data_ptr + del_if_num * chunk_size,
 209                (uint8_t *)orig_node->bat_iv.bcast_own + if_offset,
 210                (max_if_num - del_if_num) * chunk_size);
 211
 212 free_bcast_own:
 213         kfree(orig_node->bat_iv.bcast_own);
 214         orig_node->bat_iv.bcast_own = data_ptr;
 215
 216         if (max_if_num == 0)
 217                 goto free_own_sum;
 218
 219         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 220         if (!data_ptr) {
 221                 kfree(orig_node->bat_iv.bcast_own);
 222                 goto unlock;
 223         }
 224
 225         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 226                del_if_num * sizeof(u8));
 227
 228         if_offset = (del_if_num + 1) * sizeof(u8);
 229         memcpy((char *)data_ptr + del_if_num * sizeof(u8),
 230                orig_node->bat_iv.bcast_own_sum + if_offset,
 231                (max_if_num - del_if_num) * sizeof(u8));
 232
 233 free_own_sum:
 234         kfree(orig_node->bat_iv.bcast_own_sum);
 235         orig_node->bat_iv.bcast_own_sum = data_ptr;
 236
 237         ret = 0;
 238 unlock:
 239         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 240
 241         return ret;
 242 }
 243
 244 /**
 245  * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
 246  * @bat_priv: the bat priv with all the soft interface information
 247  * @addr: mac address of the originator
 248  *
 249  * Returns the originator object corresponding to the passed mac address or NULL
 250  * on failure.
 251  * If the object does not exists it is created an initialised.
 252  */
 253 static struct batadv_orig_node *
 254 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr)
 255 {
 256         struct batadv_orig_node *orig_node;
 257         int size, hash_added;
 258
 259         orig_node = batadv_orig_hash_find(bat_priv, addr);
 260         if (orig_node)
 261                 return orig_node;
 262
 263         orig_node = batadv_orig_node_new(bat_priv, addr);
 264         if (!orig_node)
 265                 return NULL;
 266
 267         spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
 268
 269         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 270         orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
 271         if (!orig_node->bat_iv.bcast_own)
 272                 goto free_orig_node;
 273
 274         size = bat_priv->num_ifaces * sizeof(u8);
 275         orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 276         if (!orig_node->bat_iv.bcast_own_sum)
 277                 goto free_orig_node;
 278
 279         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 280                                      batadv_choose_orig, orig_node,
 281                                      &orig_node->hash_entry);
 282         if (hash_added != 0)
 283                 goto free_orig_node;
 284
 285         return orig_node;
 286
 287 free_orig_node:
 288         /* free twice, as batadv_orig_node_new sets refcount to 2 */
 289         batadv_orig_node_free_ref(orig_node);
 290         batadv_orig_node_free_ref(orig_node);
 291
 292         return NULL;
 293 }
 294
 295 static struct batadv_neigh_node *
 296 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
 297                         const u8 *neigh_addr,
 298                         struct batadv_orig_node *orig_node,
 299                         struct batadv_orig_node *orig_neigh)
 300 {
 301         struct batadv_neigh_node *neigh_node;
 302
 303         neigh_node = batadv_neigh_node_new(orig_node, hard_iface, neigh_addr);
 304         if (!neigh_node)
 305                 goto out;
 306
 307         neigh_node->orig_node = orig_neigh;
 308
 309 out:
 310         return neigh_node;
 311 }
 312
 313 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
 314 {
 315         struct batadv_ogm_packet *batadv_ogm_packet;
 316         unsigned char *ogm_buff;
 317         u32 random_seqno;
 318
 319         /* randomize initial seqno to avoid collision */
 320         get_random_bytes(&random_seqno, sizeof(random_seqno));
 321         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 322
 323         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 324         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 325         if (!ogm_buff)
 326                 return -ENOMEM;
 327
 328         hard_iface->bat_iv.ogm_buff = ogm_buff;
 329
 330         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 331         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 332         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 333         batadv_ogm_packet->ttl = 2;
 334         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 335         batadv_ogm_packet->reserved = 0;
 336         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 337
 338         return 0;
 339 }
 340
 341 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 342 {
 343         kfree(hard_iface->bat_iv.ogm_buff);
 344         hard_iface->bat_iv.ogm_buff = NULL;
 345 }
 346
 347 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 348 {
 349         struct batadv_ogm_packet *batadv_ogm_packet;
 350         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 351
 352         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 353         ether_addr_copy(batadv_ogm_packet->orig,
 354                         hard_iface->net_dev->dev_addr);
 355         ether_addr_copy(batadv_ogm_packet->prev_sender,
 356                         hard_iface->net_dev->dev_addr);
 357 }
 358
 359 static void
 360 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 361 {
 362         struct batadv_ogm_packet *batadv_ogm_packet;
 363         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 364
 365         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 366         batadv_ogm_packet->ttl = BATADV_TTL;
 367 }
 368
 369 /* when do we schedule our own ogm to be sent */
 370 static unsigned long
 371 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 372 {
 373         unsigned int msecs;
 374
 375         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 376         msecs += prandom_u32() % (2 * BATADV_JITTER);
 377
 378         return jiffies + msecs_to_jiffies(msecs);
 379 }
 380
 381 /* when do we schedule a ogm packet to be sent */
 382 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 383 {
 384         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 385 }
 386
 387 /* apply hop penalty for a normal link */
 388 static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv)
 389 {
 390         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 391         int new_tq;
 392
 393         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 394         new_tq /= BATADV_TQ_MAX_VALUE;
 395
 396         return new_tq;
 397 }
 398
 399 /* is there another aggregated packet here? */
 400 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 401                                       __be16 tvlv_len)
 402 {
 403         int next_buff_pos = 0;
 404
 405         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 406         next_buff_pos += ntohs(tvlv_len);
 407
 408         return (next_buff_pos <= packet_len) &&
 409                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 410 }
 411
 412 /* send a batman ogm to a given interface */
 413 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 414                                      struct batadv_hard_iface *hard_iface)
 415 {
 416         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 417         const char *fwd_str;
 418         u8 packet_num;
 419         s16 buff_pos;
 420         struct batadv_ogm_packet *batadv_ogm_packet;
 421         struct sk_buff *skb;
 422         u8 *packet_pos;
 423
 424         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 425                 return;
 426
 427         packet_num = 0;
 428         buff_pos = 0;
 429         packet_pos = forw_packet->skb->data;
 430         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 431
 432         /* adjust all flags and log packets */
 433         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 434                                          batadv_ogm_packet->tvlv_len)) {
 435                 /* we might have aggregated direct link packets with an
 436                  * ordinary base packet
 437                  */
 438                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 439                     forw_packet->if_incoming == hard_iface)
 440                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 441                 else
 442                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 443
 444                 if (packet_num > 0 || !forw_packet->own)
 445                         fwd_str = "Forwarding";
 446                 else
 447                         fwd_str = "Sending own";
 448
 449                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 450                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 451                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 452                            batadv_ogm_packet->orig,
 453                            ntohl(batadv_ogm_packet->seqno),
 454                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 455                            ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ?
 456                             "on" : "off"),
 457                            hard_iface->net_dev->name,
 458                            hard_iface->net_dev->dev_addr);
 459
 460                 buff_pos += BATADV_OGM_HLEN;
 461                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 462                 packet_num++;
 463                 packet_pos = forw_packet->skb->data + buff_pos;
 464                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 465         }
 466
 467         /* create clone because function is called more than once */
 468         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 469         if (skb) {
 470                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 471                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 472                                    skb->len + ETH_HLEN);
 473                 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 474         }
 475 }
 476
 477 /* send a batman ogm packet */
 478 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 479 {
 480         struct net_device *soft_iface;
 481         struct batadv_priv *bat_priv;
 482         struct batadv_hard_iface *primary_if = NULL;
 483
 484         if (!forw_packet->if_incoming) {
 485                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 486                 goto out;
 487         }
 488
 489         soft_iface = forw_packet->if_incoming->soft_iface;
 490         bat_priv = netdev_priv(soft_iface);
 491
 492         if (WARN_ON(!forw_packet->if_outgoing))
 493                 goto out;
 494
 495         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 496                 goto out;
 497
 498         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 499                 goto out;
 500
 501         primary_if = batadv_primary_if_get_selected(bat_priv);
 502         if (!primary_if)
 503                 goto out;
 504
 505         /* only for one specific outgoing interface */
 506         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 507
 508 out:
 509         if (primary_if)
 510                 batadv_hardif_free_ref(primary_if);
 511 }
 512
 513 /**
 514  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 515  *  existing forward packet
 516  * @new_bat_ogm_packet: OGM packet to be aggregated
 517  * @bat_priv: the bat priv with all the soft interface information
 518  * @packet_len: (total) length of the OGM
 519  * @send_time: timestamp (jiffies) when the packet is to be sent
 520  * @directlink: true if this is a direct link packet
 521  * @if_incoming: interface where the packet was received
 522  * @if_outgoing: interface for which the retransmission should be considered
 523  * @forw_packet: the forwarded packet which should be checked
 524  *
 525  * Returns true if new_packet can be aggregated with forw_packet
 526  */
 527 static bool
 528 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 529                             struct batadv_priv *bat_priv,
 530                             int packet_len, unsigned long send_time,
 531                             bool directlink,
 532                             const struct batadv_hard_iface *if_incoming,
 533                             const struct batadv_hard_iface *if_outgoing,
 534                             const struct batadv_forw_packet *forw_packet)
 535 {
 536         struct batadv_ogm_packet *batadv_ogm_packet;
 537         int aggregated_bytes = forw_packet->packet_len + packet_len;
 538         struct batadv_hard_iface *primary_if = NULL;
 539         bool res = false;
 540         unsigned long aggregation_end_time;
 541
 542         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 543         aggregation_end_time = send_time;
 544         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 545
 546         /* we can aggregate the current packet to this aggregated packet
 547          * if:
 548          *
 549          * - the send time is within our MAX_AGGREGATION_MS time
 550          * - the resulting packet wont be bigger than
 551          *   MAX_AGGREGATION_BYTES
 552          * otherwise aggregation is not possible
 553          */
 554         if (!time_before(send_time, forw_packet->send_time) ||
 555             !time_after_eq(aggregation_end_time, forw_packet->send_time))
 556                 return false;
 557
 558         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
 559                 return false;
 560
 561         /* packet is not leaving on the same interface. */
 562         if (forw_packet->if_outgoing != if_outgoing)
 563                 return false;
 564
 565         /* check aggregation compatibility
 566          * -> direct link packets are broadcasted on
 567          *    their interface only
 568          * -> aggregate packet if the current packet is
 569          *    a "global" packet as well as the base
 570          *    packet
 571          */
 572         primary_if = batadv_primary_if_get_selected(bat_priv);
 573         if (!primary_if)
 574                 return false;
 575
 576         /* packets without direct link flag and high TTL
 577          * are flooded through the net
 578          */
 579         if (!directlink &&
 580             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
 581             batadv_ogm_packet->ttl != 1 &&
 582
 583             /* own packets originating non-primary
 584              * interfaces leave only that interface
 585              */
 586             (!forw_packet->own ||
 587              forw_packet->if_incoming == primary_if)) {
 588                 res = true;
 589                 goto out;
 590         }
 591
 592         /* if the incoming packet is sent via this one
 593          * interface only - we still can aggregate
 594          */
 595         if (directlink &&
 596             new_bat_ogm_packet->ttl == 1 &&
 597             forw_packet->if_incoming == if_incoming &&
 598
 599             /* packets from direct neighbors or
 600              * own secondary interface packets
 601              * (= secondary interface packets in general)
 602              */
 603             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 604              (forw_packet->own &&
 605               forw_packet->if_incoming != primary_if))) {
 606                 res = true;
 607                 goto out;
 608         }
 609
 610 out:
 611         if (primary_if)
 612                 batadv_hardif_free_ref(primary_if);
 613         return res;
 614 }
 615
 616 /**
 617  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
 618  *  packet to it.
 619  * @packet_buff: pointer to the OGM
 620  * @packet_len: (total) length of the OGM
 621  * @send_time: timestamp (jiffies) when the packet is to be sent
 622  * @direct_link: whether this OGM has direct link status
 623  * @if_incoming: interface where the packet was received
 624  * @if_outgoing: interface for which the retransmission should be considered
 625  * @own_packet: true if it is a self-generated ogm
 626  */
 627 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 628                                         int packet_len, unsigned long send_time,
 629                                         bool direct_link,
 630                                         struct batadv_hard_iface *if_incoming,
 631                                         struct batadv_hard_iface *if_outgoing,
 632                                         int own_packet)
 633 {
 634         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 635         struct batadv_forw_packet *forw_packet_aggr;
 636         unsigned char *skb_buff;
 637         unsigned int skb_size;
 638
 639         if (!atomic_inc_not_zero(&if_incoming->refcount))
 640                 return;
 641
 642         if (!atomic_inc_not_zero(&if_outgoing->refcount))
 643                 goto out_free_incoming;
 644
 645         /* own packet should always be scheduled */
 646         if (!own_packet) {
 647                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 648                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 649                                    "batman packet queue full\n");
 650                         goto out_free_outgoing;
 651                 }
 652         }
 653
 654         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 655         if (!forw_packet_aggr)
 656                 goto out_nomem;
 657
 658         if (atomic_read(&bat_priv->aggregated_ogms) &&
 659             packet_len < BATADV_MAX_AGGREGATION_BYTES)
 660                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 661         else
 662                 skb_size = packet_len;
 663
 664         skb_size += ETH_HLEN;
 665
 666         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 667         if (!forw_packet_aggr->skb)
 668                 goto out_free_forw_packet;
 669         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 670         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 671
 672         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 673         forw_packet_aggr->packet_len = packet_len;
 674         memcpy(skb_buff, packet_buff, packet_len);
 675
 676         forw_packet_aggr->own = own_packet;
 677         forw_packet_aggr->if_incoming = if_incoming;
 678         forw_packet_aggr->if_outgoing = if_outgoing;
 679         forw_packet_aggr->num_packets = 0;
 680         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 681         forw_packet_aggr->send_time = send_time;
 682
 683         /* save packet direct link flag status */
 684         if (direct_link)
 685                 forw_packet_aggr->direct_link_flags |= 1;
 686
 687         /* add new packet to packet list */
 688         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 689         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 690         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 691
 692         /* start timer for this packet */
 693         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 694                           batadv_send_outstanding_bat_ogm_packet);
 695         queue_delayed_work(batadv_event_workqueue,
 696                            &forw_packet_aggr->delayed_work,
 697                            send_time - jiffies);
 698
 699         return;
 700 out_free_forw_packet:
 701         kfree(forw_packet_aggr);
 702 out_nomem:
 703         if (!own_packet)
 704                 atomic_inc(&bat_priv->batman_queue_left);
 705 out_free_outgoing:
 706         batadv_hardif_free_ref(if_outgoing);
 707 out_free_incoming:
 708         batadv_hardif_free_ref(if_incoming);
 709 }
 710
 711 /* aggregate a new packet into the existing ogm packet */
 712 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 713                                     const unsigned char *packet_buff,
 714                                     int packet_len, bool direct_link)
 715 {
 716         unsigned char *skb_buff;
 717         unsigned long new_direct_link_flag;
 718
 719         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 720         memcpy(skb_buff, packet_buff, packet_len);
 721         forw_packet_aggr->packet_len += packet_len;
 722         forw_packet_aggr->num_packets++;
 723
 724         /* save packet direct link flag status */
 725         if (direct_link) {
 726                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 727                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 728         }
 729 }
 730
 731 /**
 732  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 733  * @bat_priv: the bat priv with all the soft interface information
 734  * @packet_buff: pointer to the OGM
 735  * @packet_len: (total) length of the OGM
 736  * @if_incoming: interface where the packet was received
 737  * @if_outgoing: interface for which the retransmission should be considered
 738  * @own_packet: true if it is a self-generated ogm
 739  * @send_time: timestamp (jiffies) when the packet is to be sent
 740  */
 741 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 742                                     unsigned char *packet_buff,
 743                                     int packet_len,
 744                                     struct batadv_hard_iface *if_incoming,
 745                                     struct batadv_hard_iface *if_outgoing,
 746                                     int own_packet, unsigned long send_time)
 747 {
 748         /* _aggr -> pointer to the packet we want to aggregate with
 749          * _pos -> pointer to the position in the queue
 750          */
 751         struct batadv_forw_packet *forw_packet_aggr = NULL;
 752         struct batadv_forw_packet *forw_packet_pos = NULL;
 753         struct batadv_ogm_packet *batadv_ogm_packet;
 754         bool direct_link;
 755         unsigned long max_aggregation_jiffies;
 756
 757         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 758         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 759         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 760
 761         /* find position for the packet in the forward queue */
 762         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 763         /* own packets are not to be aggregated */
 764         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 765                 hlist_for_each_entry(forw_packet_pos,
 766                                      &bat_priv->forw_bat_list, list) {
 767                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 768                                                         bat_priv, packet_len,
 769                                                         send_time, direct_link,
 770                                                         if_incoming,
 771                                                         if_outgoing,
 772                                                         forw_packet_pos)) {
 773                                 forw_packet_aggr = forw_packet_pos;
 774                                 break;
 775                         }
 776                 }
 777         }
 778
 779         /* nothing to aggregate with - either aggregation disabled or no
 780          * suitable aggregation packet found
 781          */
 782         if (!forw_packet_aggr) {
 783                 /* the following section can run without the lock */
 784                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 785
 786                 /* if we could not aggregate this packet with one of the others
 787                  * we hold it back for a while, so that it might be aggregated
 788                  * later on
 789                  */
 790                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 791                         send_time += max_aggregation_jiffies;
 792
 793                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 794                                             send_time, direct_link,
 795                                             if_incoming, if_outgoing,
 796                                             own_packet);
 797         } else {
 798                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 799                                         packet_len, direct_link);
 800                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 801         }
 802 }
 803
 804 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 805                                   const struct ethhdr *ethhdr,
 806                                   struct batadv_ogm_packet *batadv_ogm_packet,
 807                                   bool is_single_hop_neigh,
 808                                   bool is_from_best_next_hop,
 809                                   struct batadv_hard_iface *if_incoming,
 810                                   struct batadv_hard_iface *if_outgoing)
 811 {
 812         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 813         u16 tvlv_len;
 814
 815         if (batadv_ogm_packet->ttl <= 1) {
 816                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 817                 return;
 818         }
 819
 820         if (!is_from_best_next_hop) {
 821                 /* Mark the forwarded packet when it is not coming from our
 822                  * best next hop. We still need to forward the packet for our
 823                  * neighbor link quality detection to work in case the packet
 824                  * originated from a single hop neighbor. Otherwise we can
 825                  * simply drop the ogm.
 826                  */
 827                 if (is_single_hop_neigh)
 828                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 829                 else
 830                         return;
 831         }
 832
 833         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 834
 835         batadv_ogm_packet->ttl--;
 836         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 837
 838         /* apply hop penalty */
 839         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 840                                                    bat_priv);
 841
 842         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 843                    "Forwarding packet: tq: %i, ttl: %i\n",
 844                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 845
 846         if (is_single_hop_neigh)
 847                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 848         else
 849                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 850
 851         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 852                                 BATADV_OGM_HLEN + tvlv_len,
 853                                 if_incoming, if_outgoing, 0,
 854                                 batadv_iv_ogm_fwd_send_time());
 855 }
 856
 857 /**
 858  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 859  * the given interface
 860  * @hard_iface: the interface for which the windows have to be shifted
 861  */
 862 static void
 863 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 864 {
 865         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 866         struct batadv_hashtable *hash = bat_priv->orig_hash;
 867         struct hlist_head *head;
 868         struct batadv_orig_node *orig_node;
 869         unsigned long *word;
 870         u32 i;
 871         size_t word_index;
 872         u8 *w;
 873         int if_num;
 874
 875         for (i = 0; i < hash->size; i++) {
 876                 head = &hash->table[i];
 877
 878                 rcu_read_lock();
 879                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 880                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 881                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 882                         word = &orig_node->bat_iv.bcast_own[word_index];
 883
 884                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 885                         if_num = hard_iface->if_num;
 886                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 887                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 888                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 889                 }
 890                 rcu_read_unlock();
 891         }
 892 }
 893
 894 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 895 {
 896         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 897         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 898         struct batadv_ogm_packet *batadv_ogm_packet;
 899         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 900         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 901         u32 seqno;
 902         u16 tvlv_len = 0;
 903         unsigned long send_time;
 904
 905         primary_if = batadv_primary_if_get_selected(bat_priv);
 906
 907         if (hard_iface == primary_if) {
 908                 /* tt changes have to be committed before the tvlv data is
 909                  * appended as it may alter the tt tvlv container
 910                  */
 911                 batadv_tt_local_commit_changes(bat_priv);
 912                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 913                                                             ogm_buff_len,
 914                                                             BATADV_OGM_HLEN);
 915         }
 916
 917         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 918         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 919
 920         /* change sequence number to network order */
 921         seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 922         batadv_ogm_packet->seqno = htonl(seqno);
 923         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 924
 925         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 926
 927         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 928
 929         if (hard_iface != primary_if) {
 930                 /* OGMs from secondary interfaces are only scheduled on their
 931                  * respective interfaces.
 932                  */
 933                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 934                                         hard_iface, hard_iface, 1, send_time);
 935                 goto out;
 936         }
 937
 938         /* OGMs from primary interfaces are scheduled on all
 939          * interfaces.
 940          */
 941         rcu_read_lock();
 942         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 943                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 944                         continue;
 945                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 946                                         *ogm_buff_len, hard_iface,
 947                                         tmp_hard_iface, 1, send_time);
 948         }
 949         rcu_read_unlock();
 950
 951 out:
 952         if (primary_if)
 953                 batadv_hardif_free_ref(primary_if);
 954 }
 955
 956 /**
 957  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
 958  *  originator
 959  * @bat_priv: the bat priv with all the soft interface information
 960  * @orig_node: the orig node who originally emitted the ogm packet
 961  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
 962  * @ethhdr: Ethernet header of the OGM
 963  * @batadv_ogm_packet: the ogm packet
 964  * @if_incoming: interface where the packet was received
 965  * @if_outgoing: interface for which the retransmission should be considered
 966  * @dup_status: the duplicate status of this ogm packet.
 967  */
 968 static void
 969 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 970                           struct batadv_orig_node *orig_node,
 971                           struct batadv_orig_ifinfo *orig_ifinfo,
 972                           const struct ethhdr *ethhdr,
 973                           const struct batadv_ogm_packet *batadv_ogm_packet,
 974                           struct batadv_hard_iface *if_incoming,
 975                           struct batadv_hard_iface *if_outgoing,
 976                           enum batadv_dup_status dup_status)
 977 {
 978         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
 979         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
 980         struct batadv_neigh_node *neigh_node = NULL;
 981         struct batadv_neigh_node *tmp_neigh_node = NULL;
 982         struct batadv_neigh_node *router = NULL;
 983         struct batadv_orig_node *orig_node_tmp;
 984         int if_num;
 985         u8 sum_orig, sum_neigh;
 986         u8 *neigh_addr;
 987         u8 tq_avg;
 988
 989         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 990                    "update_originator(): Searching and updating originator entry of received packet\n");
 991
 992         rcu_read_lock();
 993         hlist_for_each_entry_rcu(tmp_neigh_node,
 994                                  &orig_node->neigh_list, list) {
 995                 neigh_addr = tmp_neigh_node->addr;
 996                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 997                     tmp_neigh_node->if_incoming == if_incoming &&
 998                     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 999                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1000                                 batadv_neigh_node_free_ref(neigh_node);
1001                         neigh_node = tmp_neigh_node;
1002                         continue;
1003                 }
1004
1005                 if (dup_status != BATADV_NO_DUP)
1006                         continue;
1007
1008                 /* only update the entry for this outgoing interface */
1009                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1010                                                        if_outgoing);
1011                 if (!neigh_ifinfo)
1012                         continue;
1013
1014                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1015                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1016                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1017                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1018                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1019                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1020
1021                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1022                 neigh_ifinfo = NULL;
1023         }
1024
1025         if (!neigh_node) {
1026                 struct batadv_orig_node *orig_tmp;
1027
1028                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1029                 if (!orig_tmp)
1030                         goto unlock;
1031
1032                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1033                                                      ethhdr->h_source,
1034                                                      orig_node, orig_tmp);
1035
1036                 batadv_orig_node_free_ref(orig_tmp);
1037                 if (!neigh_node)
1038                         goto unlock;
1039         } else {
1040                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1041                            "Updating existing last-hop neighbor of originator\n");
1042         }
1043
1044         rcu_read_unlock();
1045         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1046         if (!neigh_ifinfo)
1047                 goto out;
1048
1049         neigh_node->last_seen = jiffies;
1050
1051         spin_lock_bh(&neigh_node->ifinfo_lock);
1052         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1053                                &neigh_ifinfo->bat_iv.tq_index,
1054                                batadv_ogm_packet->tq);
1055         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1056         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1057         spin_unlock_bh(&neigh_node->ifinfo_lock);
1058
1059         if (dup_status == BATADV_NO_DUP) {
1060                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1061                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1062         }
1063
1064         /* if this neighbor already is our next hop there is nothing
1065          * to change
1066          */
1067         router = batadv_orig_router_get(orig_node, if_outgoing);
1068         if (router == neigh_node)
1069                 goto out;
1070
1071         if (router) {
1072                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1073                 if (!router_ifinfo)
1074                         goto out;
1075
1076                 /* if this neighbor does not offer a better TQ we won't
1077                  * consider it
1078                  */
1079                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1080                         goto out;
1081         }
1082
1083         /* if the TQ is the same and the link not more symmetric we
1084          * won't consider it either
1085          */
1086         if (router_ifinfo &&
1087             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1088                 orig_node_tmp = router->orig_node;
1089                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1090                 if_num = router->if_incoming->if_num;
1091                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1092                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1093
1094                 orig_node_tmp = neigh_node->orig_node;
1095                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1096                 if_num = neigh_node->if_incoming->if_num;
1097                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1098                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1099
1100                 if (sum_orig >= sum_neigh)
1101                         goto out;
1102         }
1103
1104         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1105         goto out;
1106
1107 unlock:
1108         rcu_read_unlock();
1109 out:
1110         if (neigh_node)
1111                 batadv_neigh_node_free_ref(neigh_node);
1112         if (router)
1113                 batadv_neigh_node_free_ref(router);
1114         if (neigh_ifinfo)
1115                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1116         if (router_ifinfo)
1117                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1118 }
1119
1120 /**
1121  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1122  * @orig_node: the orig node who originally emitted the ogm packet
1123  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1124  * @batadv_ogm_packet: the ogm packet
1125  * @if_incoming: interface where the packet was received
1126  * @if_outgoing: interface for which the retransmission should be considered
1127  *
1128  * Returns 1 if the link can be considered bidirectional, 0 otherwise
1129  */
1130 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1131                                  struct batadv_orig_node *orig_neigh_node,
1132                                  struct batadv_ogm_packet *batadv_ogm_packet,
1133                                  struct batadv_hard_iface *if_incoming,
1134                                  struct batadv_hard_iface *if_outgoing)
1135 {
1136         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1137         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1138         struct batadv_neigh_ifinfo *neigh_ifinfo;
1139         u8 total_count;
1140         u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1141         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1142         int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
1143         unsigned int combined_tq;
1144         int tq_iface_penalty;
1145
1146         /* find corresponding one hop neighbor */
1147         rcu_read_lock();
1148         hlist_for_each_entry_rcu(tmp_neigh_node,
1149                                  &orig_neigh_node->neigh_list, list) {
1150                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1151                                         orig_neigh_node->orig))
1152                         continue;
1153
1154                 if (tmp_neigh_node->if_incoming != if_incoming)
1155                         continue;
1156
1157                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1158                         continue;
1159
1160                 neigh_node = tmp_neigh_node;
1161                 break;
1162         }
1163         rcu_read_unlock();
1164
1165         if (!neigh_node)
1166                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1167                                                      orig_neigh_node->orig,
1168                                                      orig_neigh_node,
1169                                                      orig_neigh_node);
1170
1171         if (!neigh_node)
1172                 goto out;
1173
1174         /* if orig_node is direct neighbor update neigh_node last_seen */
1175         if (orig_node == orig_neigh_node)
1176                 neigh_node->last_seen = jiffies;
1177
1178         orig_node->last_seen = jiffies;
1179
1180         /* find packet count of corresponding one hop neighbor */
1181         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1182         if_num = if_incoming->if_num;
1183         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1184         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1185         if (neigh_ifinfo) {
1186                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1187                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1188         } else {
1189                 neigh_rq_count = 0;
1190         }
1191         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1192
1193         /* pay attention to not get a value bigger than 100 % */
1194         if (orig_eq_count > neigh_rq_count)
1195                 total_count = neigh_rq_count;
1196         else
1197                 total_count = orig_eq_count;
1198
1199         /* if we have too few packets (too less data) we set tq_own to zero
1200          * if we receive too few packets it is not considered bidirectional
1201          */
1202         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1203             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1204                 tq_own = 0;
1205         else
1206                 /* neigh_node->real_packet_count is never zero as we
1207                  * only purge old information when getting new
1208                  * information
1209                  */
1210                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1211
1212         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1213          * affect the nearly-symmetric links only a little, but
1214          * punishes asymmetric links more.  This will give a value
1215          * between 0 and TQ_MAX_VALUE
1216          */
1217         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1218         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1219         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1220                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1221                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1222         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1223         inv_asym_penalty /= neigh_rq_max_cube;
1224         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1225
1226         /* penalize if the OGM is forwarded on the same interface. WiFi
1227          * interfaces and other half duplex devices suffer from throughput
1228          * drops as they can't send and receive at the same time.
1229          */
1230         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1231         if (if_outgoing && (if_incoming == if_outgoing) &&
1232             batadv_is_wifi_netdev(if_outgoing->net_dev))
1233                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1234                                                       bat_priv);
1235
1236         combined_tq = batadv_ogm_packet->tq *
1237                       tq_own *
1238                       tq_asym_penalty *
1239                       tq_iface_penalty;
1240         combined_tq /= BATADV_TQ_MAX_VALUE *
1241                        BATADV_TQ_MAX_VALUE *
1242                        BATADV_TQ_MAX_VALUE;
1243         batadv_ogm_packet->tq = combined_tq;
1244
1245         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1246                    "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",
1247                    orig_node->orig, orig_neigh_node->orig, total_count,
1248                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1249                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1250                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1251
1252         /* if link has the minimum required transmission quality
1253          * consider it bidirectional
1254          */
1255         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1256                 ret = 1;
1257
1258 out:
1259         if (neigh_node)
1260                 batadv_neigh_node_free_ref(neigh_node);
1261         return ret;
1262 }
1263
1264 /**
1265  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1266  *  adjust the sequence number and find out whether it is a duplicate
1267  * @ethhdr: ethernet header of the packet
1268  * @batadv_ogm_packet: OGM packet to be considered
1269  * @if_incoming: interface on which the OGM packet was received
1270  * @if_outgoing: interface for which the retransmission should be considered
1271  *
1272  * Returns duplicate status as enum batadv_dup_status
1273  */
1274 static enum batadv_dup_status
1275 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1276                             const struct batadv_ogm_packet *batadv_ogm_packet,
1277                             const struct batadv_hard_iface *if_incoming,
1278                             struct batadv_hard_iface *if_outgoing)
1279 {
1280         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1281         struct batadv_orig_node *orig_node;
1282         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1283         struct batadv_neigh_node *neigh_node;
1284         struct batadv_neigh_ifinfo *neigh_ifinfo;
1285         int is_dup;
1286         s32 seq_diff;
1287         int need_update = 0;
1288         int set_mark;
1289         enum batadv_dup_status ret = BATADV_NO_DUP;
1290         u32 seqno = ntohl(batadv_ogm_packet->seqno);
1291         u8 *neigh_addr;
1292         u8 packet_count;
1293         unsigned long *bitmap;
1294
1295         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1296         if (!orig_node)
1297                 return BATADV_NO_DUP;
1298
1299         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1300         if (WARN_ON(!orig_ifinfo)) {
1301                 batadv_orig_node_free_ref(orig_node);
1302                 return 0;
1303         }
1304
1305         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1306         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1307
1308         /* signalize caller that the packet is to be dropped. */
1309         if (!hlist_empty(&orig_node->neigh_list) &&
1310             batadv_window_protected(bat_priv, seq_diff,
1311                                     &orig_ifinfo->batman_seqno_reset)) {
1312                 ret = BATADV_PROTECTED;
1313                 goto out;
1314         }
1315
1316         rcu_read_lock();
1317         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1318                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1319                                                        if_outgoing);
1320                 if (!neigh_ifinfo)
1321                         continue;
1322
1323                 neigh_addr = neigh_node->addr;
1324                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1325                                          orig_ifinfo->last_real_seqno,
1326                                          seqno);
1327
1328                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1329                     neigh_node->if_incoming == if_incoming) {
1330                         set_mark = 1;
1331                         if (is_dup)
1332                                 ret = BATADV_NEIGH_DUP;
1333                 } else {
1334                         set_mark = 0;
1335                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1336                                 ret = BATADV_ORIG_DUP;
1337                 }
1338
1339                 /* if the window moved, set the update flag. */
1340                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1341                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1342                                                      seq_diff, set_mark);
1343
1344                 packet_count = bitmap_weight(bitmap,
1345                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1346                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1347                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1348         }
1349         rcu_read_unlock();
1350
1351         if (need_update) {
1352                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1353                            "%s updating last_seqno: old %u, new %u\n",
1354                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1355                            orig_ifinfo->last_real_seqno, seqno);
1356                 orig_ifinfo->last_real_seqno = seqno;
1357         }
1358
1359 out:
1360         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1361         batadv_orig_node_free_ref(orig_node);
1362         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1363         return ret;
1364 }
1365
1366 /**
1367  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1368  * @skb: the skb containing the OGM
1369  * @ogm_offset: offset from skb->data to start of ogm header
1370  * @orig_node: the (cached) orig node for the originator of this OGM
1371  * @if_incoming: the interface where this packet was received
1372  * @if_outgoing: the interface for which the packet should be considered
1373  */
1374 static void
1375 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1376                                 struct batadv_orig_node *orig_node,
1377                                 struct batadv_hard_iface *if_incoming,
1378                                 struct batadv_hard_iface *if_outgoing)
1379 {
1380         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1381         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
1382         struct batadv_neigh_node *router = NULL;
1383         struct batadv_neigh_node *router_router = NULL;
1384         struct batadv_orig_node *orig_neigh_node;
1385         struct batadv_orig_ifinfo *orig_ifinfo;
1386         struct batadv_neigh_node *orig_neigh_router = NULL;
1387         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1388         struct batadv_ogm_packet *ogm_packet;
1389         enum batadv_dup_status dup_status;
1390         bool is_from_best_next_hop = false;
1391         bool is_single_hop_neigh = false;
1392         bool sameseq, similar_ttl;
1393         struct sk_buff *skb_priv;
1394         struct ethhdr *ethhdr;
1395         u8 *prev_sender;
1396         int is_bidirect;
1397
1398         /* create a private copy of the skb, as some functions change tq value
1399          * and/or flags.
1400          */
1401         skb_priv = skb_copy(skb, GFP_ATOMIC);
1402         if (!skb_priv)
1403                 return;
1404
1405         ethhdr = eth_hdr(skb_priv);
1406         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1407
1408         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1409                                                  if_incoming, if_outgoing);
1410         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1411                 is_single_hop_neigh = true;
1412
1413         if (dup_status == BATADV_PROTECTED) {
1414                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1415                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1416                            ethhdr->h_source);
1417                 goto out;
1418         }
1419
1420         if (ogm_packet->tq == 0) {
1421                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1422                            "Drop packet: originator packet with tq equal 0\n");
1423                 goto out;
1424         }
1425
1426         if (is_single_hop_neigh) {
1427                 hardif_neigh = batadv_hardif_neigh_get(if_incoming,
1428                                                        ethhdr->h_source);
1429                 if (hardif_neigh)
1430                         hardif_neigh->last_seen = jiffies;
1431         }
1432
1433         router = batadv_orig_router_get(orig_node, if_outgoing);
1434         if (router) {
1435                 router_router = batadv_orig_router_get(router->orig_node,
1436                                                        if_outgoing);
1437                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1438         }
1439
1440         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1441             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1442                 is_from_best_next_hop = true;
1443
1444         prev_sender = ogm_packet->prev_sender;
1445         /* avoid temporary routing loops */
1446         if (router && router_router &&
1447             (batadv_compare_eth(router->addr, prev_sender)) &&
1448             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1449             (batadv_compare_eth(router->addr, router_router->addr))) {
1450                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1451                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1452                            ethhdr->h_source);
1453                 goto out;
1454         }
1455
1456         if (if_outgoing == BATADV_IF_DEFAULT)
1457                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1458
1459         /* if sender is a direct neighbor the sender mac equals
1460          * originator mac
1461          */
1462         if (is_single_hop_neigh)
1463                 orig_neigh_node = orig_node;
1464         else
1465                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1466                                                          ethhdr->h_source);
1467
1468         if (!orig_neigh_node)
1469                 goto out;
1470
1471         /* Update nc_nodes of the originator */
1472         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1473                                  ogm_packet, is_single_hop_neigh);
1474
1475         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1476                                                    if_outgoing);
1477
1478         /* drop packet if sender is not a direct neighbor and if we
1479          * don't route towards it
1480          */
1481         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1482                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1483                            "Drop packet: OGM via unknown neighbor!\n");
1484                 goto out_neigh;
1485         }
1486
1487         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1488                                             ogm_packet, if_incoming,
1489                                             if_outgoing);
1490
1491         /* update ranking if it is not a duplicate or has the same
1492          * seqno and similar ttl as the non-duplicate
1493          */
1494         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1495         if (!orig_ifinfo)
1496                 goto out_neigh;
1497
1498         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1499         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1500
1501         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1502                             (sameseq && similar_ttl))) {
1503                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1504                                           orig_ifinfo, ethhdr,
1505                                           ogm_packet, if_incoming,
1506                                           if_outgoing, dup_status);
1507         }
1508         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1509
1510         /* only forward for specific interface, not for the default one. */
1511         if (if_outgoing == BATADV_IF_DEFAULT)
1512                 goto out_neigh;
1513
1514         /* is single hop (direct) neighbor */
1515         if (is_single_hop_neigh) {
1516                 /* OGMs from secondary interfaces should only scheduled once
1517                  * per interface where it has been received, not multiple times
1518                  */
1519                 if ((ogm_packet->ttl <= 2) &&
1520                     (if_incoming != if_outgoing)) {
1521                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1522                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1523                         goto out_neigh;
1524                 }
1525                 /* mark direct link on incoming interface */
1526                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1527                                       is_single_hop_neigh,
1528                                       is_from_best_next_hop, if_incoming,
1529                                       if_outgoing);
1530
1531                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1532                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1533                 goto out_neigh;
1534         }
1535
1536         /* multihop originator */
1537         if (!is_bidirect) {
1538                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1539                            "Drop packet: not received via bidirectional link\n");
1540                 goto out_neigh;
1541         }
1542
1543         if (dup_status == BATADV_NEIGH_DUP) {
1544                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1545                            "Drop packet: duplicate packet received\n");
1546                 goto out_neigh;
1547         }
1548
1549         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1550                    "Forwarding packet: rebroadcast originator packet\n");
1551         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1552                               is_single_hop_neigh, is_from_best_next_hop,
1553                               if_incoming, if_outgoing);
1554
1555 out_neigh:
1556         if ((orig_neigh_node) && (!is_single_hop_neigh))
1557                 batadv_orig_node_free_ref(orig_neigh_node);
1558 out:
1559         if (router_ifinfo)
1560                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1561         if (router)
1562                 batadv_neigh_node_free_ref(router);
1563         if (router_router)
1564                 batadv_neigh_node_free_ref(router_router);
1565         if (orig_neigh_router)
1566                 batadv_neigh_node_free_ref(orig_neigh_router);
1567         if (hardif_neigh)
1568                 batadv_hardif_neigh_free_ref(hardif_neigh);
1569
1570         kfree_skb(skb_priv);
1571 }
1572
1573 /**
1574  * batadv_iv_ogm_process - process an incoming batman iv OGM
1575  * @skb: the skb containing the OGM
1576  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1577  * @if_incoming: the interface where this packet was receved
1578  */
1579 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1580                                   struct batadv_hard_iface *if_incoming)
1581 {
1582         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1583         struct batadv_orig_node *orig_neigh_node, *orig_node;
1584         struct batadv_hard_iface *hard_iface;
1585         struct batadv_ogm_packet *ogm_packet;
1586         u32 if_incoming_seqno;
1587         bool has_directlink_flag;
1588         struct ethhdr *ethhdr;
1589         bool is_my_oldorig = false;
1590         bool is_my_addr = false;
1591         bool is_my_orig = false;
1592
1593         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1594         ethhdr = eth_hdr(skb);
1595
1596         /* Silently drop when the batman packet is actually not a
1597          * correct packet.
1598          *
1599          * This might happen if a packet is padded (e.g. Ethernet has a
1600          * minimum frame length of 64 byte) and the aggregation interprets
1601          * it as an additional length.
1602          *
1603          * TODO: A more sane solution would be to have a bit in the
1604          * batadv_ogm_packet to detect whether the packet is the last
1605          * packet in an aggregation.  Here we expect that the padding
1606          * is always zero (or not 0x01)
1607          */
1608         if (ogm_packet->packet_type != BATADV_IV_OGM)
1609                 return;
1610
1611         /* could be changed by schedule_own_packet() */
1612         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1613
1614         if (ogm_packet->flags & BATADV_DIRECTLINK)
1615                 has_directlink_flag = true;
1616         else
1617                 has_directlink_flag = false;
1618
1619         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1620                    "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",
1621                    ethhdr->h_source, if_incoming->net_dev->name,
1622                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1623                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1624                    ogm_packet->tq, ogm_packet->ttl,
1625                    ogm_packet->version, has_directlink_flag);
1626
1627         rcu_read_lock();
1628         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1629                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1630                         continue;
1631
1632                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1633                         continue;
1634
1635                 if (batadv_compare_eth(ethhdr->h_source,
1636                                        hard_iface->net_dev->dev_addr))
1637                         is_my_addr = true;
1638
1639                 if (batadv_compare_eth(ogm_packet->orig,
1640                                        hard_iface->net_dev->dev_addr))
1641                         is_my_orig = true;
1642
1643                 if (batadv_compare_eth(ogm_packet->prev_sender,
1644                                        hard_iface->net_dev->dev_addr))
1645                         is_my_oldorig = true;
1646         }
1647         rcu_read_unlock();
1648
1649         if (is_my_addr) {
1650                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1651                            "Drop packet: received my own broadcast (sender: %pM)\n",
1652                            ethhdr->h_source);
1653                 return;
1654         }
1655
1656         if (is_my_orig) {
1657                 unsigned long *word;
1658                 int offset;
1659                 s32 bit_pos;
1660                 s16 if_num;
1661                 u8 *weight;
1662
1663                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1664                                                          ethhdr->h_source);
1665                 if (!orig_neigh_node)
1666                         return;
1667
1668                 /* neighbor has to indicate direct link and it has to
1669                  * come via the corresponding interface
1670                  * save packet seqno for bidirectional check
1671                  */
1672                 if (has_directlink_flag &&
1673                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1674                                        ogm_packet->orig)) {
1675                         if_num = if_incoming->if_num;
1676                         offset = if_num * BATADV_NUM_WORDS;
1677
1678                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1679                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1680                         bit_pos = if_incoming_seqno - 2;
1681                         bit_pos -= ntohl(ogm_packet->seqno);
1682                         batadv_set_bit(word, bit_pos);
1683                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1684                         *weight = bitmap_weight(word,
1685                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1686                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1687                 }
1688
1689                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1690                            "Drop packet: originator packet from myself (via neighbor)\n");
1691                 batadv_orig_node_free_ref(orig_neigh_node);
1692                 return;
1693         }
1694
1695         if (is_my_oldorig) {
1696                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1697                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1698                            ethhdr->h_source);
1699                 return;
1700         }
1701
1702         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1703                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1704                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1705                            ethhdr->h_source);
1706                 return;
1707         }
1708
1709         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1710         if (!orig_node)
1711                 return;
1712
1713         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1714                                         if_incoming, BATADV_IF_DEFAULT);
1715
1716         rcu_read_lock();
1717         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1718                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1719                         continue;
1720
1721                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1722                         continue;
1723
1724                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1725                                                 if_incoming, hard_iface);
1726         }
1727         rcu_read_unlock();
1728
1729         batadv_orig_node_free_ref(orig_node);
1730 }
1731
1732 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1733                                  struct batadv_hard_iface *if_incoming)
1734 {
1735         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1736         struct batadv_ogm_packet *ogm_packet;
1737         u8 *packet_pos;
1738         int ogm_offset;
1739         bool ret;
1740
1741         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1742         if (!ret)
1743                 return NET_RX_DROP;
1744
1745         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1746          * that does not have B.A.T.M.A.N. IV enabled ?
1747          */
1748         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1749                 return NET_RX_DROP;
1750
1751         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1752         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1753                            skb->len + ETH_HLEN);
1754
1755         ogm_offset = 0;
1756         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1757
1758         /* unpack the aggregated packets and process them one by one */
1759         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1760                                          ogm_packet->tvlv_len)) {
1761                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1762
1763                 ogm_offset += BATADV_OGM_HLEN;
1764                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1765
1766                 packet_pos = skb->data + ogm_offset;
1767                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1768         }
1769
1770         kfree_skb(skb);
1771         return NET_RX_SUCCESS;
1772 }
1773
1774 /**
1775  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1776  * @orig_node: the orig_node for which the neighbors are printed
1777  * @if_outgoing: outgoing interface for these entries
1778  * @seq: debugfs table seq_file struct
1779  *
1780  * Must be called while holding an rcu lock.
1781  */
1782 static void
1783 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1784                                struct batadv_hard_iface *if_outgoing,
1785                                struct seq_file *seq)
1786 {
1787         struct batadv_neigh_node *neigh_node;
1788         struct batadv_neigh_ifinfo *n_ifinfo;
1789
1790         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1791                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1792                 if (!n_ifinfo)
1793                         continue;
1794
1795                 seq_printf(seq, " %pM (%3i)",
1796                            neigh_node->addr,
1797                            n_ifinfo->bat_iv.tq_avg);
1798
1799                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1800         }
1801 }
1802
1803 /**
1804  * batadv_iv_ogm_orig_print - print the originator table
1805  * @bat_priv: the bat priv with all the soft interface information
1806  * @seq: debugfs table seq_file struct
1807  * @if_outgoing: the outgoing interface for which this should be printed
1808  */
1809 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1810                                      struct seq_file *seq,
1811                                      struct batadv_hard_iface *if_outgoing)
1812 {
1813         struct batadv_neigh_node *neigh_node;
1814         struct batadv_hashtable *hash = bat_priv->orig_hash;
1815         int last_seen_msecs, last_seen_secs;
1816         struct batadv_orig_node *orig_node;
1817         struct batadv_neigh_ifinfo *n_ifinfo;
1818         unsigned long last_seen_jiffies;
1819         struct hlist_head *head;
1820         int batman_count = 0;
1821         u32 i;
1822
1823         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1824                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1825                    "Nexthop", "outgoingIF", "Potential nexthops");
1826
1827         for (i = 0; i < hash->size; i++) {
1828                 head = &hash->table[i];
1829
1830                 rcu_read_lock();
1831                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1832                         neigh_node = batadv_orig_router_get(orig_node,
1833                                                             if_outgoing);
1834                         if (!neigh_node)
1835                                 continue;
1836
1837                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1838                                                            if_outgoing);
1839                         if (!n_ifinfo)
1840                                 goto next;
1841
1842                         if (n_ifinfo->bat_iv.tq_avg == 0)
1843                                 goto next;
1844
1845                         last_seen_jiffies = jiffies - orig_node->last_seen;
1846                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1847                         last_seen_secs = last_seen_msecs / 1000;
1848                         last_seen_msecs = last_seen_msecs % 1000;
1849
1850                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1851                                    orig_node->orig, last_seen_secs,
1852                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1853                                    neigh_node->addr,
1854                                    neigh_node->if_incoming->net_dev->name);
1855
1856                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1857                                                        seq);
1858                         seq_puts(seq, "\n");
1859                         batman_count++;
1860
1861 next:
1862                         batadv_neigh_node_free_ref(neigh_node);
1863                         if (n_ifinfo)
1864                                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1865                 }
1866                 rcu_read_unlock();
1867         }
1868
1869         if (batman_count == 0)
1870                 seq_puts(seq, "No batman nodes in range ...\n");
1871 }
1872
1873 /**
1874  * batadv_iv_hardif_neigh_print - print a single hop neighbour node
1875  * @seq: neighbour table seq_file struct
1876  * @hardif_neigh: hardif neighbour information
1877  */
1878 static void
1879 batadv_iv_hardif_neigh_print(struct seq_file *seq,
1880                              struct batadv_hardif_neigh_node *hardif_neigh)
1881 {
1882         int last_secs, last_msecs;
1883
1884         last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
1885         last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
1886
1887         seq_printf(seq, "   %10s   %pM %4i.%03is\n",
1888                    hardif_neigh->if_incoming->net_dev->name,
1889                    hardif_neigh->addr, last_secs, last_msecs);
1890 }
1891
1892 /**
1893  * batadv_iv_ogm_neigh_print - print the single hop neighbour list
1894  * @bat_priv: the bat priv with all the soft interface information
1895  * @seq: neighbour table seq_file struct
1896  */
1897 static void batadv_iv_neigh_print(struct batadv_priv *bat_priv,
1898                                   struct seq_file *seq)
1899 {
1900         struct net_device *net_dev = (struct net_device *)seq->private;
1901         struct batadv_hardif_neigh_node *hardif_neigh;
1902         struct batadv_hard_iface *hard_iface;
1903         int batman_count = 0;
1904
1905         seq_printf(seq, "   %10s        %-13s %s\n",
1906                    "IF", "Neighbor", "last-seen");
1907
1908         rcu_read_lock();
1909         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1910                 if (hard_iface->soft_iface != net_dev)
1911                         continue;
1912
1913                 hlist_for_each_entry_rcu(hardif_neigh,
1914                                          &hard_iface->neigh_list, list) {
1915                         batadv_iv_hardif_neigh_print(seq, hardif_neigh);
1916                         batman_count++;
1917                 }
1918         }
1919         rcu_read_unlock();
1920
1921         if (batman_count == 0)
1922                 seq_puts(seq, "No batman nodes in range ...\n");
1923 }
1924
1925 /**
1926  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1927  * @neigh1: the first neighbor object of the comparison
1928  * @if_outgoing1: outgoing interface for the first neighbor
1929  * @neigh2: the second neighbor object of the comparison
1930  * @if_outgoing2: outgoing interface for the second neighbor
1931  *
1932  * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1933  * lower, the same as or higher than the metric via neigh2
1934  */
1935 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1936                                    struct batadv_hard_iface *if_outgoing1,
1937                                    struct batadv_neigh_node *neigh2,
1938                                    struct batadv_hard_iface *if_outgoing2)
1939 {
1940         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1941         u8 tq1, tq2;
1942         int diff;
1943
1944         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1945         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1946
1947         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1948                 diff = 0;
1949                 goto out;
1950         }
1951
1952         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1953         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1954         diff = tq1 - tq2;
1955
1956 out:
1957         if (neigh1_ifinfo)
1958                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1959         if (neigh2_ifinfo)
1960                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1961
1962         return diff;
1963 }
1964
1965 /**
1966  * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better
1967  *  than neigh2 from the metric prospective
1968  * @neigh1: the first neighbor object of the comparison
1969  * @if_outgoing1: outgoing interface for the first neighbor
1970  * @neigh2: the second neighbor object of the comparison
1971  * @if_outgoing2: outgoing interface for the second neighbor
1972  *
1973  * Returns true if the metric via neigh1 is equally good or better than
1974  * the metric via neigh2, false otherwise.
1975  */
1976 static bool
1977 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1,
1978                            struct batadv_hard_iface *if_outgoing1,
1979                            struct batadv_neigh_node *neigh2,
1980                            struct batadv_hard_iface *if_outgoing2)
1981 {
1982         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1983         u8 tq1, tq2;
1984         bool ret;
1985
1986         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1987         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1988
1989         /* we can't say that the metric is better */
1990         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1991                 ret = false;
1992                 goto out;
1993         }
1994
1995         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1996         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1997         ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
1998
1999 out:
2000         if (neigh1_ifinfo)
2001                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
2002         if (neigh2_ifinfo)
2003                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
2004
2005         return ret;
2006 }
2007
2008 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
2009         .name = "BATMAN_IV",
2010         .bat_iface_enable = batadv_iv_ogm_iface_enable,
2011         .bat_iface_disable = batadv_iv_ogm_iface_disable,
2012         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
2013         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
2014         .bat_ogm_schedule = batadv_iv_ogm_schedule,
2015         .bat_ogm_emit = batadv_iv_ogm_emit,
2016         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
2017         .bat_neigh_is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
2018         .bat_neigh_print = batadv_iv_neigh_print,
2019         .bat_orig_print = batadv_iv_ogm_orig_print,
2020         .bat_orig_free = batadv_iv_ogm_orig_free,
2021         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
2022         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
2023 };
2024
2025 int __init batadv_iv_init(void)
2026 {
2027         int ret;
2028
2029         /* batman originator packet */
2030         ret = batadv_recv_handler_register(BATADV_IV_OGM,
2031                                            batadv_iv_ogm_receive);
2032         if (ret < 0)
2033                 goto out;
2034
2035         ret = batadv_algo_register(&batadv_batman_iv);
2036         if (ret < 0)
2037                 goto handler_unregister;
2038
2039         goto out;
2040
2041 handler_unregister:
2042         batadv_recv_handler_unregister(BATADV_IV_OGM);
2043 out:
2044         return ret;
2045 }