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                                      unsigned 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                 goto unlock;
 160
 161         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 162                (max_if_num - 1) * sizeof(u8));
 163         kfree(orig_node->bat_iv.bcast_own_sum);
 164         orig_node->bat_iv.bcast_own_sum = data_ptr;
 165
 166         ret = 0;
 167
 168 unlock:
 169         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 170
 171         return ret;
 172 }
 173
 174 /**
 175  * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
 176  *  exclude the removed interface
 177  * @orig_node: the orig_node that has to be changed
 178  * @max_if_num: the current amount of interfaces
 179  * @del_if_num: the index of the interface being removed
 180  *
 181  * Returns 0 on success, a negative error code otherwise.
 182  */
 183 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
 184                                      unsigned int max_if_num,
 185                                      unsigned int del_if_num)
 186 {
 187         int ret = -ENOMEM;
 188         size_t chunk_size, if_offset;
 189         void *data_ptr = NULL;
 190
 191         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 192
 193         /* last interface was removed */
 194         if (max_if_num == 0)
 195                 goto free_bcast_own;
 196
 197         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 198         data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
 199         if (!data_ptr)
 200                 goto unlock;
 201
 202         /* copy first part */
 203         memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
 204
 205         /* copy second part */
 206         if_offset = (del_if_num + 1) * chunk_size;
 207         memcpy((char *)data_ptr + del_if_num * chunk_size,
 208                (uint8_t *)orig_node->bat_iv.bcast_own + if_offset,
 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(u8), 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(u8));
 226
 227         if_offset = (del_if_num + 1) * sizeof(u8);
 228         memcpy((char *)data_ptr + del_if_num * sizeof(u8),
 229                orig_node->bat_iv.bcast_own_sum + if_offset,
 230                (max_if_num - del_if_num) * sizeof(u8));
 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 u8 *addr)
 254 {
 255         struct batadv_orig_node *orig_node;
 256         int hash_added;
 257         size_t size;
 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         mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
 320
 321         /* randomize initial seqno to avoid collision */
 322         get_random_bytes(&random_seqno, sizeof(random_seqno));
 323         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 324
 325         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 326         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 327         if (!ogm_buff) {
 328                 mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
 329                 return -ENOMEM;
 330         }
 331
 332         hard_iface->bat_iv.ogm_buff = ogm_buff;
 333
 334         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 335         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 336         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 337         batadv_ogm_packet->ttl = 2;
 338         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 339         batadv_ogm_packet->reserved = 0;
 340         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 341
 342         mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
 343
 344         return 0;
 345 }
 346
 347 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 348 {
 349         mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
 350
 351         kfree(hard_iface->bat_iv.ogm_buff);
 352         hard_iface->bat_iv.ogm_buff = NULL;
 353
 354         mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
 355 }
 356
 357 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 358 {
 359         struct batadv_ogm_packet *batadv_ogm_packet;
 360         void *ogm_buff;
 361
 362         mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
 363
 364         ogm_buff = hard_iface->bat_iv.ogm_buff;
 365         if (!ogm_buff)
 366                 goto unlock;
 367
 368         batadv_ogm_packet = ogm_buff;
 369         ether_addr_copy(batadv_ogm_packet->orig,
 370                         hard_iface->net_dev->dev_addr);
 371         ether_addr_copy(batadv_ogm_packet->prev_sender,
 372                         hard_iface->net_dev->dev_addr);
 373
 374 unlock:
 375         mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
 376 }
 377
 378 static void
 379 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 380 {
 381         struct batadv_ogm_packet *batadv_ogm_packet;
 382         void *ogm_buff;
 383
 384         mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
 385
 386         ogm_buff = hard_iface->bat_iv.ogm_buff;
 387         if (!ogm_buff)
 388                 goto unlock;
 389
 390         batadv_ogm_packet = ogm_buff;
 391         batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
 392         batadv_ogm_packet->ttl = BATADV_TTL;
 393
 394 unlock:
 395         mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
 396 }
 397
 398 /* when do we schedule our own ogm to be sent */
 399 static unsigned long
 400 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 401 {
 402         unsigned int msecs;
 403
 404         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 405         msecs += prandom_u32() % (2 * BATADV_JITTER);
 406
 407         return jiffies + msecs_to_jiffies(msecs);
 408 }
 409
 410 /* when do we schedule a ogm packet to be sent */
 411 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 412 {
 413         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 414 }
 415
 416 /* apply hop penalty for a normal link */
 417 static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv)
 418 {
 419         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 420         int new_tq;
 421
 422         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 423         new_tq /= BATADV_TQ_MAX_VALUE;
 424
 425         return new_tq;
 426 }
 427
 428 static bool
 429 batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 430                           const struct batadv_ogm_packet *ogm_packet)
 431 {
 432         int next_buff_pos = 0;
 433
 434         /* check if there is enough space for the header */
 435         next_buff_pos += buff_pos + sizeof(*ogm_packet);
 436         if (next_buff_pos > packet_len)
 437                 return false;
 438
 439         /* check if there is enough space for the optional TVLV */
 440         next_buff_pos += ntohs(ogm_packet->tvlv_len);
 441
 442         return (next_buff_pos <= packet_len) &&
 443                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 444 }
 445
 446 /* send a batman ogm to a given interface */
 447 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 448                                      struct batadv_hard_iface *hard_iface)
 449 {
 450         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 451         const char *fwd_str;
 452         u8 packet_num;
 453         s16 buff_pos;
 454         struct batadv_ogm_packet *batadv_ogm_packet;
 455         struct sk_buff *skb;
 456         u8 *packet_pos;
 457
 458         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 459                 return;
 460
 461         packet_num = 0;
 462         buff_pos = 0;
 463         packet_pos = forw_packet->skb->data;
 464         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 465
 466         /* adjust all flags and log packets */
 467         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 468                                          batadv_ogm_packet)) {
 469                 /* we might have aggregated direct link packets with an
 470                  * ordinary base packet
 471                  */
 472                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 473                     forw_packet->if_incoming == hard_iface)
 474                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 475                 else
 476                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 477
 478                 if (packet_num > 0 || !forw_packet->own)
 479                         fwd_str = "Forwarding";
 480                 else
 481                         fwd_str = "Sending own";
 482
 483                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 484                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 485                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 486                            batadv_ogm_packet->orig,
 487                            ntohl(batadv_ogm_packet->seqno),
 488                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 489                            ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ?
 490                             "on" : "off"),
 491                            hard_iface->net_dev->name,
 492                            hard_iface->net_dev->dev_addr);
 493
 494                 buff_pos += BATADV_OGM_HLEN;
 495                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 496                 packet_num++;
 497                 packet_pos = forw_packet->skb->data + buff_pos;
 498                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 499         }
 500
 501         /* create clone because function is called more than once */
 502         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 503         if (skb) {
 504                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 505                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 506                                    skb->len + ETH_HLEN);
 507                 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 508         }
 509 }
 510
 511 /* send a batman ogm packet */
 512 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 513 {
 514         struct net_device *soft_iface;
 515         struct batadv_priv *bat_priv;
 516         struct batadv_hard_iface *primary_if = NULL;
 517
 518         if (!forw_packet->if_incoming) {
 519                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 520                 goto out;
 521         }
 522
 523         soft_iface = forw_packet->if_incoming->soft_iface;
 524         bat_priv = netdev_priv(soft_iface);
 525
 526         if (WARN_ON(!forw_packet->if_outgoing))
 527                 goto out;
 528
 529         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 530                 goto out;
 531
 532         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 533                 goto out;
 534
 535         primary_if = batadv_primary_if_get_selected(bat_priv);
 536         if (!primary_if)
 537                 goto out;
 538
 539         /* only for one specific outgoing interface */
 540         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 541
 542 out:
 543         if (primary_if)
 544                 batadv_hardif_free_ref(primary_if);
 545 }
 546
 547 /**
 548  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 549  *  existing forward packet
 550  * @new_bat_ogm_packet: OGM packet to be aggregated
 551  * @bat_priv: the bat priv with all the soft interface information
 552  * @packet_len: (total) length of the OGM
 553  * @send_time: timestamp (jiffies) when the packet is to be sent
 554  * @directlink: true if this is a direct link packet
 555  * @if_incoming: interface where the packet was received
 556  * @if_outgoing: interface for which the retransmission should be considered
 557  * @forw_packet: the forwarded packet which should be checked
 558  *
 559  * Returns true if new_packet can be aggregated with forw_packet
 560  */
 561 static bool
 562 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 563                             struct batadv_priv *bat_priv,
 564                             int packet_len, unsigned long send_time,
 565                             bool directlink,
 566                             const struct batadv_hard_iface *if_incoming,
 567                             const struct batadv_hard_iface *if_outgoing,
 568                             const struct batadv_forw_packet *forw_packet)
 569 {
 570         struct batadv_ogm_packet *batadv_ogm_packet;
 571         int aggregated_bytes = forw_packet->packet_len + packet_len;
 572         struct batadv_hard_iface *primary_if = NULL;
 573         bool res = false;
 574         unsigned long aggregation_end_time;
 575
 576         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 577         aggregation_end_time = send_time;
 578         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 579
 580         /* we can aggregate the current packet to this aggregated packet
 581          * if:
 582          *
 583          * - the send time is within our MAX_AGGREGATION_MS time
 584          * - the resulting packet wont be bigger than
 585          *   MAX_AGGREGATION_BYTES
 586          * otherwise aggregation is not possible
 587          */
 588         if (!time_before(send_time, forw_packet->send_time) ||
 589             !time_after_eq(aggregation_end_time, forw_packet->send_time))
 590                 return false;
 591
 592         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
 593                 return false;
 594
 595         /* packet is not leaving on the same interface. */
 596         if (forw_packet->if_outgoing != if_outgoing)
 597                 return false;
 598
 599         /* check aggregation compatibility
 600          * -> direct link packets are broadcasted on
 601          *    their interface only
 602          * -> aggregate packet if the current packet is
 603          *    a "global" packet as well as the base
 604          *    packet
 605          */
 606         primary_if = batadv_primary_if_get_selected(bat_priv);
 607         if (!primary_if)
 608                 return false;
 609
 610         /* packets without direct link flag and high TTL
 611          * are flooded through the net
 612          */
 613         if (!directlink &&
 614             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
 615             batadv_ogm_packet->ttl != 1 &&
 616
 617             /* own packets originating non-primary
 618              * interfaces leave only that interface
 619              */
 620             (!forw_packet->own ||
 621              forw_packet->if_incoming == primary_if)) {
 622                 res = true;
 623                 goto out;
 624         }
 625
 626         /* if the incoming packet is sent via this one
 627          * interface only - we still can aggregate
 628          */
 629         if (directlink &&
 630             new_bat_ogm_packet->ttl == 1 &&
 631             forw_packet->if_incoming == if_incoming &&
 632
 633             /* packets from direct neighbors or
 634              * own secondary interface packets
 635              * (= secondary interface packets in general)
 636              */
 637             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 638              (forw_packet->own &&
 639               forw_packet->if_incoming != primary_if))) {
 640                 res = true;
 641                 goto out;
 642         }
 643
 644 out:
 645         if (primary_if)
 646                 batadv_hardif_free_ref(primary_if);
 647         return res;
 648 }
 649
 650 /**
 651  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
 652  *  packet to it.
 653  * @packet_buff: pointer to the OGM
 654  * @packet_len: (total) length of the OGM
 655  * @send_time: timestamp (jiffies) when the packet is to be sent
 656  * @direct_link: whether this OGM has direct link status
 657  * @if_incoming: interface where the packet was received
 658  * @if_outgoing: interface for which the retransmission should be considered
 659  * @own_packet: true if it is a self-generated ogm
 660  */
 661 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 662                                         int packet_len, unsigned long send_time,
 663                                         bool direct_link,
 664                                         struct batadv_hard_iface *if_incoming,
 665                                         struct batadv_hard_iface *if_outgoing,
 666                                         int own_packet)
 667 {
 668         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 669         struct batadv_forw_packet *forw_packet_aggr;
 670         unsigned char *skb_buff;
 671         unsigned int skb_size;
 672
 673         if (!atomic_inc_not_zero(&if_incoming->refcount))
 674                 return;
 675
 676         if (!atomic_inc_not_zero(&if_outgoing->refcount))
 677                 goto out_free_incoming;
 678
 679         /* own packet should always be scheduled */
 680         if (!own_packet) {
 681                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 682                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 683                                    "batman packet queue full\n");
 684                         goto out_free_outgoing;
 685                 }
 686         }
 687
 688         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 689         if (!forw_packet_aggr)
 690                 goto out_nomem;
 691
 692         if (atomic_read(&bat_priv->aggregated_ogms) &&
 693             packet_len < BATADV_MAX_AGGREGATION_BYTES)
 694                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 695         else
 696                 skb_size = packet_len;
 697
 698         skb_size += ETH_HLEN;
 699
 700         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 701         if (!forw_packet_aggr->skb)
 702                 goto out_free_forw_packet;
 703         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 704         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 705
 706         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 707         forw_packet_aggr->packet_len = packet_len;
 708         memcpy(skb_buff, packet_buff, packet_len);
 709
 710         forw_packet_aggr->own = own_packet;
 711         forw_packet_aggr->if_incoming = if_incoming;
 712         forw_packet_aggr->if_outgoing = if_outgoing;
 713         forw_packet_aggr->num_packets = 0;
 714         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 715         forw_packet_aggr->send_time = send_time;
 716
 717         /* save packet direct link flag status */
 718         if (direct_link)
 719                 forw_packet_aggr->direct_link_flags |= 1;
 720
 721         /* add new packet to packet list */
 722         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 723         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 724         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 725
 726         /* start timer for this packet */
 727         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 728                           batadv_send_outstanding_bat_ogm_packet);
 729         queue_delayed_work(batadv_event_workqueue,
 730                            &forw_packet_aggr->delayed_work,
 731                            send_time - jiffies);
 732
 733         return;
 734 out_free_forw_packet:
 735         kfree(forw_packet_aggr);
 736 out_nomem:
 737         if (!own_packet)
 738                 atomic_inc(&bat_priv->batman_queue_left);
 739 out_free_outgoing:
 740         batadv_hardif_free_ref(if_outgoing);
 741 out_free_incoming:
 742         batadv_hardif_free_ref(if_incoming);
 743 }
 744
 745 /* aggregate a new packet into the existing ogm packet */
 746 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 747                                     const unsigned char *packet_buff,
 748                                     int packet_len, bool direct_link)
 749 {
 750         unsigned char *skb_buff;
 751         unsigned long new_direct_link_flag;
 752
 753         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 754         memcpy(skb_buff, packet_buff, packet_len);
 755         forw_packet_aggr->packet_len += packet_len;
 756         forw_packet_aggr->num_packets++;
 757
 758         /* save packet direct link flag status */
 759         if (direct_link) {
 760                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 761                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 762         }
 763 }
 764
 765 /**
 766  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 767  * @bat_priv: the bat priv with all the soft interface information
 768  * @packet_buff: pointer to the OGM
 769  * @packet_len: (total) length of the OGM
 770  * @if_incoming: interface where the packet was received
 771  * @if_outgoing: interface for which the retransmission should be considered
 772  * @own_packet: true if it is a self-generated ogm
 773  * @send_time: timestamp (jiffies) when the packet is to be sent
 774  */
 775 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 776                                     unsigned char *packet_buff,
 777                                     int packet_len,
 778                                     struct batadv_hard_iface *if_incoming,
 779                                     struct batadv_hard_iface *if_outgoing,
 780                                     int own_packet, unsigned long send_time)
 781 {
 782         /* _aggr -> pointer to the packet we want to aggregate with
 783          * _pos -> pointer to the position in the queue
 784          */
 785         struct batadv_forw_packet *forw_packet_aggr = NULL;
 786         struct batadv_forw_packet *forw_packet_pos = NULL;
 787         struct batadv_ogm_packet *batadv_ogm_packet;
 788         bool direct_link;
 789         unsigned long max_aggregation_jiffies;
 790
 791         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 792         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 793         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 794
 795         /* find position for the packet in the forward queue */
 796         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 797         /* own packets are not to be aggregated */
 798         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 799                 hlist_for_each_entry(forw_packet_pos,
 800                                      &bat_priv->forw_bat_list, list) {
 801                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 802                                                         bat_priv, packet_len,
 803                                                         send_time, direct_link,
 804                                                         if_incoming,
 805                                                         if_outgoing,
 806                                                         forw_packet_pos)) {
 807                                 forw_packet_aggr = forw_packet_pos;
 808                                 break;
 809                         }
 810                 }
 811         }
 812
 813         /* nothing to aggregate with - either aggregation disabled or no
 814          * suitable aggregation packet found
 815          */
 816         if (!forw_packet_aggr) {
 817                 /* the following section can run without the lock */
 818                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 819
 820                 /* if we could not aggregate this packet with one of the others
 821                  * we hold it back for a while, so that it might be aggregated
 822                  * later on
 823                  */
 824                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 825                         send_time += max_aggregation_jiffies;
 826
 827                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 828                                             send_time, direct_link,
 829                                             if_incoming, if_outgoing,
 830                                             own_packet);
 831         } else {
 832                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 833                                         packet_len, direct_link);
 834                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 835         }
 836 }
 837
 838 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 839                                   const struct ethhdr *ethhdr,
 840                                   struct batadv_ogm_packet *batadv_ogm_packet,
 841                                   bool is_single_hop_neigh,
 842                                   bool is_from_best_next_hop,
 843                                   struct batadv_hard_iface *if_incoming,
 844                                   struct batadv_hard_iface *if_outgoing)
 845 {
 846         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 847         u16 tvlv_len;
 848
 849         if (batadv_ogm_packet->ttl <= 1) {
 850                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 851                 return;
 852         }
 853
 854         if (!is_from_best_next_hop) {
 855                 /* Mark the forwarded packet when it is not coming from our
 856                  * best next hop. We still need to forward the packet for our
 857                  * neighbor link quality detection to work in case the packet
 858                  * originated from a single hop neighbor. Otherwise we can
 859                  * simply drop the ogm.
 860                  */
 861                 if (is_single_hop_neigh)
 862                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 863                 else
 864                         return;
 865         }
 866
 867         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 868
 869         batadv_ogm_packet->ttl--;
 870         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 871
 872         /* apply hop penalty */
 873         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 874                                                    bat_priv);
 875
 876         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 877                    "Forwarding packet: tq: %i, ttl: %i\n",
 878                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 879
 880         /* switch of primaries first hop flag when forwarding */
 881         batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
 882         if (is_single_hop_neigh)
 883                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 884         else
 885                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 886
 887         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 888                                 BATADV_OGM_HLEN + tvlv_len,
 889                                 if_incoming, if_outgoing, 0,
 890                                 batadv_iv_ogm_fwd_send_time());
 891 }
 892
 893 /**
 894  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 895  * the given interface
 896  * @hard_iface: the interface for which the windows have to be shifted
 897  */
 898 static void
 899 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 900 {
 901         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 902         struct batadv_hashtable *hash = bat_priv->orig_hash;
 903         struct hlist_head *head;
 904         struct batadv_orig_node *orig_node;
 905         unsigned long *word;
 906         u32 i;
 907         size_t word_index;
 908         u8 *w;
 909         unsigned int if_num;
 910
 911         for (i = 0; i < hash->size; i++) {
 912                 head = &hash->table[i];
 913
 914                 rcu_read_lock();
 915                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 916                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 917                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 918                         word = &orig_node->bat_iv.bcast_own[word_index];
 919
 920                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 921                         if_num = hard_iface->if_num;
 922                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 923                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 924                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 925                 }
 926                 rcu_read_unlock();
 927         }
 928 }
 929
 930 /**
 931  * batadv_iv_ogm_schedule_buff() - schedule submission of hardif ogm buffer
 932  * @hard_iface: interface whose ogm buffer should be transmitted
 933  */
 934 static void batadv_iv_ogm_schedule_buff(struct batadv_hard_iface *hard_iface)
 935 {
 936         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 937         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 938         struct batadv_ogm_packet *batadv_ogm_packet;
 939         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 940         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 941         u32 seqno;
 942         u16 tvlv_len = 0;
 943         unsigned long send_time;
 944
 945         lockdep_assert_held(&hard_iface->bat_iv.ogm_buff_mutex);
 946
 947         /* interface already disabled by batadv_iv_ogm_iface_disable */
 948         if (!*ogm_buff)
 949                 return;
 950
 951         primary_if = batadv_primary_if_get_selected(bat_priv);
 952
 953         if (hard_iface == primary_if) {
 954                 /* tt changes have to be committed before the tvlv data is
 955                  * appended as it may alter the tt tvlv container
 956                  */
 957                 batadv_tt_local_commit_changes(bat_priv);
 958                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 959                                                             ogm_buff_len,
 960                                                             BATADV_OGM_HLEN);
 961         }
 962
 963         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 964         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 965
 966         /* change sequence number to network order */
 967         seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 968         batadv_ogm_packet->seqno = htonl(seqno);
 969         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 970
 971         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 972
 973         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 974
 975         if (hard_iface != primary_if) {
 976                 /* OGMs from secondary interfaces are only scheduled on their
 977                  * respective interfaces.
 978                  */
 979                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 980                                         hard_iface, hard_iface, 1, send_time);
 981                 goto out;
 982         }
 983
 984         /* OGMs from primary interfaces are scheduled on all
 985          * interfaces.
 986          */
 987         rcu_read_lock();
 988         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 989                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 990                         continue;
 991                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 992                                         *ogm_buff_len, hard_iface,
 993                                         tmp_hard_iface, 1, send_time);
 994         }
 995         rcu_read_unlock();
 996
 997 out:
 998         if (primary_if)
 999                 batadv_hardif_free_ref(primary_if);
1000 }
1001
1002 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
1003 {
1004         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE ||
1005             hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)
1006                 return;
1007
1008         mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
1009         batadv_iv_ogm_schedule_buff(hard_iface);
1010         mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
1011 }
1012
1013 /**
1014  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
1015  *  originator
1016  * @bat_priv: the bat priv with all the soft interface information
1017  * @orig_node: the orig node who originally emitted the ogm packet
1018  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
1019  * @ethhdr: Ethernet header of the OGM
1020  * @batadv_ogm_packet: the ogm packet
1021  * @if_incoming: interface where the packet was received
1022  * @if_outgoing: interface for which the retransmission should be considered
1023  * @dup_status: the duplicate status of this ogm packet.
1024  */
1025 static void
1026 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
1027                           struct batadv_orig_node *orig_node,
1028                           struct batadv_orig_ifinfo *orig_ifinfo,
1029                           const struct ethhdr *ethhdr,
1030                           const struct batadv_ogm_packet *batadv_ogm_packet,
1031                           struct batadv_hard_iface *if_incoming,
1032                           struct batadv_hard_iface *if_outgoing,
1033                           enum batadv_dup_status dup_status)
1034 {
1035         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
1036         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1037         struct batadv_neigh_node *neigh_node = NULL;
1038         struct batadv_neigh_node *tmp_neigh_node = NULL;
1039         struct batadv_neigh_node *router = NULL;
1040         struct batadv_orig_node *orig_node_tmp;
1041         unsigned int if_num;
1042         u8 sum_orig, sum_neigh;
1043         u8 *neigh_addr;
1044         u8 tq_avg;
1045
1046         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1047                    "update_originator(): Searching and updating originator entry of received packet\n");
1048
1049         rcu_read_lock();
1050         hlist_for_each_entry_rcu(tmp_neigh_node,
1051                                  &orig_node->neigh_list, list) {
1052                 neigh_addr = tmp_neigh_node->addr;
1053                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1054                     tmp_neigh_node->if_incoming == if_incoming &&
1055                     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
1056                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1057                                 batadv_neigh_node_free_ref(neigh_node);
1058                         neigh_node = tmp_neigh_node;
1059                         continue;
1060                 }
1061
1062                 if (dup_status != BATADV_NO_DUP)
1063                         continue;
1064
1065                 /* only update the entry for this outgoing interface */
1066                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1067                                                        if_outgoing);
1068                 if (!neigh_ifinfo)
1069                         continue;
1070
1071                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1072                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1073                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1074                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1075                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1076                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1077
1078                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1079                 neigh_ifinfo = NULL;
1080         }
1081
1082         if (!neigh_node) {
1083                 struct batadv_orig_node *orig_tmp;
1084
1085                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1086                 if (!orig_tmp)
1087                         goto unlock;
1088
1089                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1090                                                      ethhdr->h_source,
1091                                                      orig_node, orig_tmp);
1092
1093                 batadv_orig_node_free_ref(orig_tmp);
1094                 if (!neigh_node)
1095                         goto unlock;
1096         } else {
1097                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1098                            "Updating existing last-hop neighbor of originator\n");
1099         }
1100
1101         rcu_read_unlock();
1102         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1103         if (!neigh_ifinfo)
1104                 goto out;
1105
1106         neigh_node->last_seen = jiffies;
1107
1108         spin_lock_bh(&neigh_node->ifinfo_lock);
1109         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1110                                &neigh_ifinfo->bat_iv.tq_index,
1111                                batadv_ogm_packet->tq);
1112         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1113         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1114         spin_unlock_bh(&neigh_node->ifinfo_lock);
1115
1116         if (dup_status == BATADV_NO_DUP) {
1117                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1118                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1119         }
1120
1121         /* if this neighbor already is our next hop there is nothing
1122          * to change
1123          */
1124         router = batadv_orig_router_get(orig_node, if_outgoing);
1125         if (router == neigh_node)
1126                 goto out;
1127
1128         if (router) {
1129                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1130                 if (!router_ifinfo)
1131                         goto out;
1132
1133                 /* if this neighbor does not offer a better TQ we won't
1134                  * consider it
1135                  */
1136                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1137                         goto out;
1138         }
1139
1140         /* if the TQ is the same and the link not more symmetric we
1141          * won't consider it either
1142          */
1143         if (router_ifinfo &&
1144             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1145                 orig_node_tmp = router->orig_node;
1146                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1147                 if_num = router->if_incoming->if_num;
1148                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1149                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1150
1151                 orig_node_tmp = neigh_node->orig_node;
1152                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1153                 if_num = neigh_node->if_incoming->if_num;
1154                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1155                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1156
1157                 if (sum_orig >= sum_neigh)
1158                         goto out;
1159         }
1160
1161         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1162         goto out;
1163
1164 unlock:
1165         rcu_read_unlock();
1166 out:
1167         if (neigh_node)
1168                 batadv_neigh_node_free_ref(neigh_node);
1169         if (router)
1170                 batadv_neigh_node_free_ref(router);
1171         if (neigh_ifinfo)
1172                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1173         if (router_ifinfo)
1174                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1175 }
1176
1177 /**
1178  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1179  * @orig_node: the orig node who originally emitted the ogm packet
1180  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1181  * @batadv_ogm_packet: the ogm packet
1182  * @if_incoming: interface where the packet was received
1183  * @if_outgoing: interface for which the retransmission should be considered
1184  *
1185  * Returns 1 if the link can be considered bidirectional, 0 otherwise
1186  */
1187 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1188                                  struct batadv_orig_node *orig_neigh_node,
1189                                  struct batadv_ogm_packet *batadv_ogm_packet,
1190                                  struct batadv_hard_iface *if_incoming,
1191                                  struct batadv_hard_iface *if_outgoing)
1192 {
1193         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1194         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1195         struct batadv_neigh_ifinfo *neigh_ifinfo;
1196         u8 total_count;
1197         u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1198         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1199         int if_num, ret = 0;
1200         unsigned int tq_asym_penalty, inv_asym_penalty;
1201         unsigned int combined_tq;
1202         unsigned int tq_iface_penalty;
1203
1204         /* find corresponding one hop neighbor */
1205         rcu_read_lock();
1206         hlist_for_each_entry_rcu(tmp_neigh_node,
1207                                  &orig_neigh_node->neigh_list, list) {
1208                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1209                                         orig_neigh_node->orig))
1210                         continue;
1211
1212                 if (tmp_neigh_node->if_incoming != if_incoming)
1213                         continue;
1214
1215                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1216                         continue;
1217
1218                 neigh_node = tmp_neigh_node;
1219                 break;
1220         }
1221         rcu_read_unlock();
1222
1223         if (!neigh_node)
1224                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1225                                                      orig_neigh_node->orig,
1226                                                      orig_neigh_node,
1227                                                      orig_neigh_node);
1228
1229         if (!neigh_node)
1230                 goto out;
1231
1232         /* if orig_node is direct neighbor update neigh_node last_seen */
1233         if (orig_node == orig_neigh_node)
1234                 neigh_node->last_seen = jiffies;
1235
1236         orig_node->last_seen = jiffies;
1237
1238         /* find packet count of corresponding one hop neighbor */
1239         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1240         if_num = if_incoming->if_num;
1241         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1242         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1243         if (neigh_ifinfo) {
1244                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1245                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1246         } else {
1247                 neigh_rq_count = 0;
1248         }
1249         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1250
1251         /* pay attention to not get a value bigger than 100 % */
1252         if (orig_eq_count > neigh_rq_count)
1253                 total_count = neigh_rq_count;
1254         else
1255                 total_count = orig_eq_count;
1256
1257         /* if we have too few packets (too less data) we set tq_own to zero
1258          * if we receive too few packets it is not considered bidirectional
1259          */
1260         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1261             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1262                 tq_own = 0;
1263         else
1264                 /* neigh_node->real_packet_count is never zero as we
1265                  * only purge old information when getting new
1266                  * information
1267                  */
1268                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1269
1270         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1271          * affect the nearly-symmetric links only a little, but
1272          * punishes asymmetric links more.  This will give a value
1273          * between 0 and TQ_MAX_VALUE
1274          */
1275         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1276         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1277         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1278                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1279                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1280         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1281         inv_asym_penalty /= neigh_rq_max_cube;
1282         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1283
1284         /* penalize if the OGM is forwarded on the same interface. WiFi
1285          * interfaces and other half duplex devices suffer from throughput
1286          * drops as they can't send and receive at the same time.
1287          */
1288         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1289         if (if_outgoing && (if_incoming == if_outgoing) &&
1290             batadv_is_wifi_netdev(if_outgoing->net_dev))
1291                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1292                                                       bat_priv);
1293
1294         combined_tq = batadv_ogm_packet->tq *
1295                       tq_own *
1296                       tq_asym_penalty *
1297                       tq_iface_penalty;
1298         combined_tq /= BATADV_TQ_MAX_VALUE *
1299                        BATADV_TQ_MAX_VALUE *
1300                        BATADV_TQ_MAX_VALUE;
1301         batadv_ogm_packet->tq = combined_tq;
1302
1303         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1304                    "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",
1305                    orig_node->orig, orig_neigh_node->orig, total_count,
1306                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1307                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1308                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1309
1310         /* if link has the minimum required transmission quality
1311          * consider it bidirectional
1312          */
1313         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1314                 ret = 1;
1315
1316 out:
1317         if (neigh_node)
1318                 batadv_neigh_node_free_ref(neigh_node);
1319         return ret;
1320 }
1321
1322 /**
1323  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1324  *  adjust the sequence number and find out whether it is a duplicate
1325  * @ethhdr: ethernet header of the packet
1326  * @batadv_ogm_packet: OGM packet to be considered
1327  * @if_incoming: interface on which the OGM packet was received
1328  * @if_outgoing: interface for which the retransmission should be considered
1329  *
1330  * Returns duplicate status as enum batadv_dup_status
1331  */
1332 static enum batadv_dup_status
1333 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1334                             const struct batadv_ogm_packet *batadv_ogm_packet,
1335                             const struct batadv_hard_iface *if_incoming,
1336                             struct batadv_hard_iface *if_outgoing)
1337 {
1338         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1339         struct batadv_orig_node *orig_node;
1340         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1341         struct batadv_neigh_node *neigh_node;
1342         struct batadv_neigh_ifinfo *neigh_ifinfo;
1343         int is_dup;
1344         s32 seq_diff;
1345         int need_update = 0;
1346         int set_mark;
1347         enum batadv_dup_status ret = BATADV_NO_DUP;
1348         u32 seqno = ntohl(batadv_ogm_packet->seqno);
1349         u8 *neigh_addr;
1350         u8 packet_count;
1351         unsigned long *bitmap;
1352
1353         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1354         if (!orig_node)
1355                 return BATADV_NO_DUP;
1356
1357         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1358         if (WARN_ON(!orig_ifinfo)) {
1359                 batadv_orig_node_free_ref(orig_node);
1360                 return 0;
1361         }
1362
1363         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1364         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1365
1366         /* signalize caller that the packet is to be dropped. */
1367         if (!hlist_empty(&orig_node->neigh_list) &&
1368             batadv_window_protected(bat_priv, seq_diff,
1369                                     &orig_ifinfo->batman_seqno_reset)) {
1370                 ret = BATADV_PROTECTED;
1371                 goto out;
1372         }
1373
1374         rcu_read_lock();
1375         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1376                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1377                                                        if_outgoing);
1378                 if (!neigh_ifinfo)
1379                         continue;
1380
1381                 neigh_addr = neigh_node->addr;
1382                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1383                                          orig_ifinfo->last_real_seqno,
1384                                          seqno);
1385
1386                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1387                     neigh_node->if_incoming == if_incoming) {
1388                         set_mark = 1;
1389                         if (is_dup)
1390                                 ret = BATADV_NEIGH_DUP;
1391                 } else {
1392                         set_mark = 0;
1393                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1394                                 ret = BATADV_ORIG_DUP;
1395                 }
1396
1397                 /* if the window moved, set the update flag. */
1398                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1399                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1400                                                      seq_diff, set_mark);
1401
1402                 packet_count = bitmap_weight(bitmap,
1403                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1404                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1405                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1406         }
1407         rcu_read_unlock();
1408
1409         if (need_update) {
1410                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1411                            "%s updating last_seqno: old %u, new %u\n",
1412                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1413                            orig_ifinfo->last_real_seqno, seqno);
1414                 orig_ifinfo->last_real_seqno = seqno;
1415         }
1416
1417 out:
1418         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1419         batadv_orig_node_free_ref(orig_node);
1420         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1421         return ret;
1422 }
1423
1424 /**
1425  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1426  * @skb: the skb containing the OGM
1427  * @ogm_offset: offset from skb->data to start of ogm header
1428  * @orig_node: the (cached) orig node for the originator of this OGM
1429  * @if_incoming: the interface where this packet was received
1430  * @if_outgoing: the interface for which the packet should be considered
1431  */
1432 static void
1433 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1434                                 struct batadv_orig_node *orig_node,
1435                                 struct batadv_hard_iface *if_incoming,
1436                                 struct batadv_hard_iface *if_outgoing)
1437 {
1438         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1439         struct batadv_neigh_node *router = NULL;
1440         struct batadv_neigh_node *router_router = NULL;
1441         struct batadv_orig_node *orig_neigh_node;
1442         struct batadv_orig_ifinfo *orig_ifinfo;
1443         struct batadv_neigh_node *orig_neigh_router = NULL;
1444         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1445         struct batadv_ogm_packet *ogm_packet;
1446         enum batadv_dup_status dup_status;
1447         bool is_from_best_next_hop = false;
1448         bool is_single_hop_neigh = false;
1449         bool sameseq, similar_ttl;
1450         struct sk_buff *skb_priv;
1451         struct ethhdr *ethhdr;
1452         u8 *prev_sender;
1453         int is_bidirect;
1454
1455         /* create a private copy of the skb, as some functions change tq value
1456          * and/or flags.
1457          */
1458         skb_priv = skb_copy(skb, GFP_ATOMIC);
1459         if (!skb_priv)
1460                 return;
1461
1462         ethhdr = eth_hdr(skb_priv);
1463         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1464
1465         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1466                                                  if_incoming, if_outgoing);
1467         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1468                 is_single_hop_neigh = true;
1469
1470         if (dup_status == BATADV_PROTECTED) {
1471                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1472                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1473                            ethhdr->h_source);
1474                 goto out;
1475         }
1476
1477         if (ogm_packet->tq == 0) {
1478                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1479                            "Drop packet: originator packet with tq equal 0\n");
1480                 goto out;
1481         }
1482
1483         router = batadv_orig_router_get(orig_node, if_outgoing);
1484         if (router) {
1485                 router_router = batadv_orig_router_get(router->orig_node,
1486                                                        if_outgoing);
1487                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1488         }
1489
1490         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1491             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1492                 is_from_best_next_hop = true;
1493
1494         prev_sender = ogm_packet->prev_sender;
1495         /* avoid temporary routing loops */
1496         if (router && router_router &&
1497             (batadv_compare_eth(router->addr, prev_sender)) &&
1498             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1499             (batadv_compare_eth(router->addr, router_router->addr))) {
1500                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1501                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1502                            ethhdr->h_source);
1503                 goto out;
1504         }
1505
1506         if (if_outgoing == BATADV_IF_DEFAULT)
1507                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1508
1509         /* if sender is a direct neighbor the sender mac equals
1510          * originator mac
1511          */
1512         if (is_single_hop_neigh)
1513                 orig_neigh_node = orig_node;
1514         else
1515                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1516                                                          ethhdr->h_source);
1517
1518         if (!orig_neigh_node)
1519                 goto out;
1520
1521         /* Update nc_nodes of the originator */
1522         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1523                                  ogm_packet, is_single_hop_neigh);
1524
1525         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1526                                                    if_outgoing);
1527
1528         /* drop packet if sender is not a direct neighbor and if we
1529          * don't route towards it
1530          */
1531         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1532                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1533                            "Drop packet: OGM via unknown neighbor!\n");
1534                 goto out_neigh;
1535         }
1536
1537         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1538                                             ogm_packet, if_incoming,
1539                                             if_outgoing);
1540
1541         /* update ranking if it is not a duplicate or has the same
1542          * seqno and similar ttl as the non-duplicate
1543          */
1544         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1545         if (!orig_ifinfo)
1546                 goto out_neigh;
1547
1548         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1549         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1550
1551         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1552                             (sameseq && similar_ttl))) {
1553                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1554                                           orig_ifinfo, ethhdr,
1555                                           ogm_packet, if_incoming,
1556                                           if_outgoing, dup_status);
1557         }
1558         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1559
1560         /* only forward for specific interface, not for the default one. */
1561         if (if_outgoing == BATADV_IF_DEFAULT)
1562                 goto out_neigh;
1563
1564         /* is single hop (direct) neighbor */
1565         if (is_single_hop_neigh) {
1566                 /* OGMs from secondary interfaces should only scheduled once
1567                  * per interface where it has been received, not multiple times
1568                  */
1569                 if ((ogm_packet->ttl <= 2) &&
1570                     (if_incoming != if_outgoing)) {
1571                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1572                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1573                         goto out_neigh;
1574                 }
1575                 /* mark direct link on incoming interface */
1576                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1577                                       is_single_hop_neigh,
1578                                       is_from_best_next_hop, if_incoming,
1579                                       if_outgoing);
1580
1581                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1582                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1583                 goto out_neigh;
1584         }
1585
1586         /* multihop originator */
1587         if (!is_bidirect) {
1588                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1589                            "Drop packet: not received via bidirectional link\n");
1590                 goto out_neigh;
1591         }
1592
1593         if (dup_status == BATADV_NEIGH_DUP) {
1594                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1595                            "Drop packet: duplicate packet received\n");
1596                 goto out_neigh;
1597         }
1598
1599         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1600                    "Forwarding packet: rebroadcast originator packet\n");
1601         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1602                               is_single_hop_neigh, is_from_best_next_hop,
1603                               if_incoming, if_outgoing);
1604
1605 out_neigh:
1606         if ((orig_neigh_node) && (!is_single_hop_neigh))
1607                 batadv_orig_node_free_ref(orig_neigh_node);
1608 out:
1609         if (router_ifinfo)
1610                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1611         if (router)
1612                 batadv_neigh_node_free_ref(router);
1613         if (router_router)
1614                 batadv_neigh_node_free_ref(router_router);
1615         if (orig_neigh_router)
1616                 batadv_neigh_node_free_ref(orig_neigh_router);
1617
1618         kfree_skb(skb_priv);
1619 }
1620
1621 /**
1622  * batadv_iv_ogm_process - process an incoming batman iv OGM
1623  * @skb: the skb containing the OGM
1624  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1625  * @if_incoming: the interface where this packet was receved
1626  */
1627 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1628                                   struct batadv_hard_iface *if_incoming)
1629 {
1630         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1631         struct batadv_orig_node *orig_neigh_node, *orig_node;
1632         struct batadv_hard_iface *hard_iface;
1633         struct batadv_ogm_packet *ogm_packet;
1634         u32 if_incoming_seqno;
1635         bool has_directlink_flag;
1636         struct ethhdr *ethhdr;
1637         bool is_my_oldorig = false;
1638         bool is_my_addr = false;
1639         bool is_my_orig = false;
1640
1641         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1642         ethhdr = eth_hdr(skb);
1643
1644         /* Silently drop when the batman packet is actually not a
1645          * correct packet.
1646          *
1647          * This might happen if a packet is padded (e.g. Ethernet has a
1648          * minimum frame length of 64 byte) and the aggregation interprets
1649          * it as an additional length.
1650          *
1651          * TODO: A more sane solution would be to have a bit in the
1652          * batadv_ogm_packet to detect whether the packet is the last
1653          * packet in an aggregation.  Here we expect that the padding
1654          * is always zero (or not 0x01)
1655          */
1656         if (ogm_packet->packet_type != BATADV_IV_OGM)
1657                 return;
1658
1659         /* could be changed by schedule_own_packet() */
1660         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1661
1662         if (ogm_packet->flags & BATADV_DIRECTLINK)
1663                 has_directlink_flag = true;
1664         else
1665                 has_directlink_flag = false;
1666
1667         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1668                    "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",
1669                    ethhdr->h_source, if_incoming->net_dev->name,
1670                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1671                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1672                    ogm_packet->tq, ogm_packet->ttl,
1673                    ogm_packet->version, has_directlink_flag);
1674
1675         rcu_read_lock();
1676         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1677                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1678                         continue;
1679
1680                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1681                         continue;
1682
1683                 if (batadv_compare_eth(ethhdr->h_source,
1684                                        hard_iface->net_dev->dev_addr))
1685                         is_my_addr = true;
1686
1687                 if (batadv_compare_eth(ogm_packet->orig,
1688                                        hard_iface->net_dev->dev_addr))
1689                         is_my_orig = true;
1690
1691                 if (batadv_compare_eth(ogm_packet->prev_sender,
1692                                        hard_iface->net_dev->dev_addr))
1693                         is_my_oldorig = true;
1694         }
1695         rcu_read_unlock();
1696
1697         if (is_my_addr) {
1698                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1699                            "Drop packet: received my own broadcast (sender: %pM)\n",
1700                            ethhdr->h_source);
1701                 return;
1702         }
1703
1704         if (is_my_orig) {
1705                 unsigned long *word;
1706                 size_t offset;
1707                 s32 bit_pos;
1708                 unsigned int if_num;
1709                 u8 *weight;
1710
1711                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1712                                                          ethhdr->h_source);
1713                 if (!orig_neigh_node)
1714                         return;
1715
1716                 /* neighbor has to indicate direct link and it has to
1717                  * come via the corresponding interface
1718                  * save packet seqno for bidirectional check
1719                  */
1720                 if (has_directlink_flag &&
1721                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1722                                        ogm_packet->orig)) {
1723                         if_num = if_incoming->if_num;
1724                         offset = if_num * BATADV_NUM_WORDS;
1725
1726                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1727                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1728                         bit_pos = if_incoming_seqno - 2;
1729                         bit_pos -= ntohl(ogm_packet->seqno);
1730                         batadv_set_bit(word, bit_pos);
1731                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1732                         *weight = bitmap_weight(word,
1733                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1734                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1735                 }
1736
1737                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1738                            "Drop packet: originator packet from myself (via neighbor)\n");
1739                 batadv_orig_node_free_ref(orig_neigh_node);
1740                 return;
1741         }
1742
1743         if (is_my_oldorig) {
1744                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1745                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1746                            ethhdr->h_source);
1747                 return;
1748         }
1749
1750         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1751                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1752                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1753                            ethhdr->h_source);
1754                 return;
1755         }
1756
1757         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1758         if (!orig_node)
1759                 return;
1760
1761         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1762                                         if_incoming, BATADV_IF_DEFAULT);
1763
1764         rcu_read_lock();
1765         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1766                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1767                         continue;
1768
1769                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1770                         continue;
1771
1772                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1773                                                 if_incoming, hard_iface);
1774         }
1775         rcu_read_unlock();
1776
1777         batadv_orig_node_free_ref(orig_node);
1778 }
1779
1780 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1781                                  struct batadv_hard_iface *if_incoming)
1782 {
1783         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1784         struct batadv_ogm_packet *ogm_packet;
1785         u8 *packet_pos;
1786         int ogm_offset;
1787         bool ret;
1788
1789         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1790         if (!ret)
1791                 return NET_RX_DROP;
1792
1793         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1794          * that does not have B.A.T.M.A.N. IV enabled ?
1795          */
1796         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1797                 return NET_RX_DROP;
1798
1799         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1800         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1801                            skb->len + ETH_HLEN);
1802
1803         ogm_offset = 0;
1804         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1805
1806         /* unpack the aggregated packets and process them one by one */
1807         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1808                                          ogm_packet)) {
1809                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1810
1811                 ogm_offset += BATADV_OGM_HLEN;
1812                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1813
1814                 packet_pos = skb->data + ogm_offset;
1815                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1816         }
1817
1818         kfree_skb(skb);
1819         return NET_RX_SUCCESS;
1820 }
1821
1822 /**
1823  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1824  * @orig_node: the orig_node for which the neighbors are printed
1825  * @if_outgoing: outgoing interface for these entries
1826  * @seq: debugfs table seq_file struct
1827  *
1828  * Must be called while holding an rcu lock.
1829  */
1830 static void
1831 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1832                                struct batadv_hard_iface *if_outgoing,
1833                                struct seq_file *seq)
1834 {
1835         struct batadv_neigh_node *neigh_node;
1836         struct batadv_neigh_ifinfo *n_ifinfo;
1837
1838         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1839                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1840                 if (!n_ifinfo)
1841                         continue;
1842
1843                 seq_printf(seq, " %pM (%3i)",
1844                            neigh_node->addr,
1845                            n_ifinfo->bat_iv.tq_avg);
1846
1847                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1848         }
1849 }
1850
1851 /**
1852  * batadv_iv_ogm_orig_print - print the originator table
1853  * @bat_priv: the bat priv with all the soft interface information
1854  * @seq: debugfs table seq_file struct
1855  * @if_outgoing: the outgoing interface for which this should be printed
1856  */
1857 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1858                                      struct seq_file *seq,
1859                                      struct batadv_hard_iface *if_outgoing)
1860 {
1861         struct batadv_neigh_node *neigh_node;
1862         struct batadv_hashtable *hash = bat_priv->orig_hash;
1863         int last_seen_msecs, last_seen_secs;
1864         struct batadv_orig_node *orig_node;
1865         struct batadv_neigh_ifinfo *n_ifinfo;
1866         unsigned long last_seen_jiffies;
1867         struct hlist_head *head;
1868         int batman_count = 0;
1869         u32 i;
1870
1871         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1872                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1873                    "Nexthop", "outgoingIF", "Potential nexthops");
1874
1875         for (i = 0; i < hash->size; i++) {
1876                 head = &hash->table[i];
1877
1878                 rcu_read_lock();
1879                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1880                         neigh_node = batadv_orig_router_get(orig_node,
1881                                                             if_outgoing);
1882                         if (!neigh_node)
1883                                 continue;
1884
1885                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1886                                                            if_outgoing);
1887                         if (!n_ifinfo)
1888                                 goto next;
1889
1890                         if (n_ifinfo->bat_iv.tq_avg == 0)
1891                                 goto next;
1892
1893                         last_seen_jiffies = jiffies - orig_node->last_seen;
1894                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1895                         last_seen_secs = last_seen_msecs / 1000;
1896                         last_seen_msecs = last_seen_msecs % 1000;
1897
1898                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1899                                    orig_node->orig, last_seen_secs,
1900                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1901                                    neigh_node->addr,
1902                                    neigh_node->if_incoming->net_dev->name);
1903
1904                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1905                                                        seq);
1906                         seq_puts(seq, "\n");
1907                         batman_count++;
1908
1909 next:
1910                         batadv_neigh_node_free_ref(neigh_node);
1911                         if (n_ifinfo)
1912                                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1913                 }
1914                 rcu_read_unlock();
1915         }
1916
1917         if (batman_count == 0)
1918                 seq_puts(seq, "No batman nodes in range ...\n");
1919 }
1920
1921 /**
1922  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1923  * @neigh1: the first neighbor object of the comparison
1924  * @if_outgoing1: outgoing interface for the first neighbor
1925  * @neigh2: the second neighbor object of the comparison
1926  * @if_outgoing2: outgoing interface for the second neighbor
1927  *
1928  * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1929  * lower, the same as or higher than the metric via neigh2
1930  */
1931 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1932                                    struct batadv_hard_iface *if_outgoing1,
1933                                    struct batadv_neigh_node *neigh2,
1934                                    struct batadv_hard_iface *if_outgoing2)
1935 {
1936         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1937         u8 tq1, tq2;
1938         int diff;
1939
1940         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1941         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1942
1943         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1944                 diff = 0;
1945                 goto out;
1946         }
1947
1948         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1949         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1950         diff = tq1 - tq2;
1951
1952 out:
1953         if (neigh1_ifinfo)
1954                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1955         if (neigh2_ifinfo)
1956                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1957
1958         return diff;
1959 }
1960
1961 /**
1962  * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
1963  *  neigh2 from the metric prospective
1964  * @neigh1: the first neighbor object of the comparison
1965  * @if_outgoing1: outgoing interface for the first neighbor
1966  * @neigh2: the second neighbor object of the comparison
1967  * @if_outgoing2: outgoing interface for the second neighbor
1968  *
1969  * Returns true if the metric via neigh1 is equally good or better than
1970  * the metric via neigh2, false otherwise.
1971  */
1972 static bool
1973 batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1,
1974                            struct batadv_hard_iface *if_outgoing1,
1975                            struct batadv_neigh_node *neigh2,
1976                            struct batadv_hard_iface *if_outgoing2)
1977 {
1978         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1979         u8 tq1, tq2;
1980         bool ret;
1981
1982         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1983         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1984
1985         /* we can't say that the metric is better */
1986         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1987                 ret = false;
1988                 goto out;
1989         }
1990
1991         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1992         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1993         ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
1994
1995 out:
1996         if (neigh1_ifinfo)
1997                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1998         if (neigh2_ifinfo)
1999                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
2000
2001         return ret;
2002 }
2003
2004 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
2005         .name = "BATMAN_IV",
2006         .bat_iface_enable = batadv_iv_ogm_iface_enable,
2007         .bat_iface_disable = batadv_iv_ogm_iface_disable,
2008         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
2009         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
2010         .bat_ogm_schedule = batadv_iv_ogm_schedule,
2011         .bat_ogm_emit = batadv_iv_ogm_emit,
2012         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
2013         .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
2014         .bat_orig_print = batadv_iv_ogm_orig_print,
2015         .bat_orig_free = batadv_iv_ogm_orig_free,
2016         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
2017         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
2018 };
2019
2020 int __init batadv_iv_init(void)
2021 {
2022         int ret;
2023
2024         /* batman originator packet */
2025         ret = batadv_recv_handler_register(BATADV_IV_OGM,
2026                                            batadv_iv_ogm_receive);
2027         if (ret < 0)
2028                 goto out;
2029
2030         ret = batadv_algo_register(&batadv_batman_iv);
2031         if (ret < 0)
2032                 goto handler_unregister;
2033
2034         goto out;
2035
2036 handler_unregister:
2037         batadv_recv_handler_unregister(BATADV_IV_OGM);
2038 out:
2039         return ret;
2040 }