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 (forw_packet->if_outgoing->soft_iface != soft_iface) {
 530                 pr_warn("%s: soft interface switch for queued OGM\n", __func__);
 531                 goto out;
 532         }
 533
 534         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 535                 goto out;
 536
 537         primary_if = batadv_primary_if_get_selected(bat_priv);
 538         if (!primary_if)
 539                 goto out;
 540
 541         /* only for one specific outgoing interface */
 542         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 543
 544 out:
 545         if (primary_if)
 546                 batadv_hardif_free_ref(primary_if);
 547 }
 548
 549 /**
 550  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 551  *  existing forward packet
 552  * @new_bat_ogm_packet: OGM packet to be aggregated
 553  * @bat_priv: the bat priv with all the soft interface information
 554  * @packet_len: (total) length of the OGM
 555  * @send_time: timestamp (jiffies) when the packet is to be sent
 556  * @directlink: true if this is a direct link packet
 557  * @if_incoming: interface where the packet was received
 558  * @if_outgoing: interface for which the retransmission should be considered
 559  * @forw_packet: the forwarded packet which should be checked
 560  *
 561  * Returns true if new_packet can be aggregated with forw_packet
 562  */
 563 static bool
 564 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 565                             struct batadv_priv *bat_priv,
 566                             int packet_len, unsigned long send_time,
 567                             bool directlink,
 568                             const struct batadv_hard_iface *if_incoming,
 569                             const struct batadv_hard_iface *if_outgoing,
 570                             const struct batadv_forw_packet *forw_packet)
 571 {
 572         struct batadv_ogm_packet *batadv_ogm_packet;
 573         int aggregated_bytes = forw_packet->packet_len + packet_len;
 574         struct batadv_hard_iface *primary_if = NULL;
 575         bool res = false;
 576         unsigned long aggregation_end_time;
 577
 578         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 579         aggregation_end_time = send_time;
 580         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 581
 582         /* we can aggregate the current packet to this aggregated packet
 583          * if:
 584          *
 585          * - the send time is within our MAX_AGGREGATION_MS time
 586          * - the resulting packet wont be bigger than
 587          *   MAX_AGGREGATION_BYTES
 588          * otherwise aggregation is not possible
 589          */
 590         if (!time_before(send_time, forw_packet->send_time) ||
 591             !time_after_eq(aggregation_end_time, forw_packet->send_time))
 592                 return false;
 593
 594         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
 595                 return false;
 596
 597         /* packet is not leaving on the same interface. */
 598         if (forw_packet->if_outgoing != if_outgoing)
 599                 return false;
 600
 601         /* check aggregation compatibility
 602          * -> direct link packets are broadcasted on
 603          *    their interface only
 604          * -> aggregate packet if the current packet is
 605          *    a "global" packet as well as the base
 606          *    packet
 607          */
 608         primary_if = batadv_primary_if_get_selected(bat_priv);
 609         if (!primary_if)
 610                 return false;
 611
 612         /* packets without direct link flag and high TTL
 613          * are flooded through the net
 614          */
 615         if (!directlink &&
 616             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
 617             batadv_ogm_packet->ttl != 1 &&
 618
 619             /* own packets originating non-primary
 620              * interfaces leave only that interface
 621              */
 622             (!forw_packet->own ||
 623              forw_packet->if_incoming == primary_if)) {
 624                 res = true;
 625                 goto out;
 626         }
 627
 628         /* if the incoming packet is sent via this one
 629          * interface only - we still can aggregate
 630          */
 631         if (directlink &&
 632             new_bat_ogm_packet->ttl == 1 &&
 633             forw_packet->if_incoming == if_incoming &&
 634
 635             /* packets from direct neighbors or
 636              * own secondary interface packets
 637              * (= secondary interface packets in general)
 638              */
 639             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 640              (forw_packet->own &&
 641               forw_packet->if_incoming != primary_if))) {
 642                 res = true;
 643                 goto out;
 644         }
 645
 646 out:
 647         if (primary_if)
 648                 batadv_hardif_free_ref(primary_if);
 649         return res;
 650 }
 651
 652 /**
 653  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
 654  *  packet to it.
 655  * @packet_buff: pointer to the OGM
 656  * @packet_len: (total) length of the OGM
 657  * @send_time: timestamp (jiffies) when the packet is to be sent
 658  * @direct_link: whether this OGM has direct link status
 659  * @if_incoming: interface where the packet was received
 660  * @if_outgoing: interface for which the retransmission should be considered
 661  * @own_packet: true if it is a self-generated ogm
 662  */
 663 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 664                                         int packet_len, unsigned long send_time,
 665                                         bool direct_link,
 666                                         struct batadv_hard_iface *if_incoming,
 667                                         struct batadv_hard_iface *if_outgoing,
 668                                         int own_packet)
 669 {
 670         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 671         struct batadv_forw_packet *forw_packet_aggr;
 672         unsigned char *skb_buff;
 673         unsigned int skb_size;
 674
 675         if (!atomic_inc_not_zero(&if_incoming->refcount))
 676                 return;
 677
 678         if (!atomic_inc_not_zero(&if_outgoing->refcount))
 679                 goto out_free_incoming;
 680
 681         /* own packet should always be scheduled */
 682         if (!own_packet) {
 683                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 684                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 685                                    "batman packet queue full\n");
 686                         goto out_free_outgoing;
 687                 }
 688         }
 689
 690         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 691         if (!forw_packet_aggr)
 692                 goto out_nomem;
 693
 694         if (atomic_read(&bat_priv->aggregated_ogms) &&
 695             packet_len < BATADV_MAX_AGGREGATION_BYTES)
 696                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 697         else
 698                 skb_size = packet_len;
 699
 700         skb_size += ETH_HLEN;
 701
 702         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 703         if (!forw_packet_aggr->skb)
 704                 goto out_free_forw_packet;
 705         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 706         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 707
 708         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 709         forw_packet_aggr->packet_len = packet_len;
 710         memcpy(skb_buff, packet_buff, packet_len);
 711
 712         forw_packet_aggr->own = own_packet;
 713         forw_packet_aggr->if_incoming = if_incoming;
 714         forw_packet_aggr->if_outgoing = if_outgoing;
 715         forw_packet_aggr->num_packets = 0;
 716         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 717         forw_packet_aggr->send_time = send_time;
 718
 719         /* save packet direct link flag status */
 720         if (direct_link)
 721                 forw_packet_aggr->direct_link_flags |= 1;
 722
 723         /* add new packet to packet list */
 724         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 725         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 726         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 727
 728         /* start timer for this packet */
 729         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 730                           batadv_send_outstanding_bat_ogm_packet);
 731         queue_delayed_work(batadv_event_workqueue,
 732                            &forw_packet_aggr->delayed_work,
 733                            send_time - jiffies);
 734
 735         return;
 736 out_free_forw_packet:
 737         kfree(forw_packet_aggr);
 738 out_nomem:
 739         if (!own_packet)
 740                 atomic_inc(&bat_priv->batman_queue_left);
 741 out_free_outgoing:
 742         batadv_hardif_free_ref(if_outgoing);
 743 out_free_incoming:
 744         batadv_hardif_free_ref(if_incoming);
 745 }
 746
 747 /* aggregate a new packet into the existing ogm packet */
 748 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 749                                     const unsigned char *packet_buff,
 750                                     int packet_len, bool direct_link)
 751 {
 752         unsigned char *skb_buff;
 753         unsigned long new_direct_link_flag;
 754
 755         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 756         memcpy(skb_buff, packet_buff, packet_len);
 757         forw_packet_aggr->packet_len += packet_len;
 758         forw_packet_aggr->num_packets++;
 759
 760         /* save packet direct link flag status */
 761         if (direct_link) {
 762                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 763                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 764         }
 765 }
 766
 767 /**
 768  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 769  * @bat_priv: the bat priv with all the soft interface information
 770  * @packet_buff: pointer to the OGM
 771  * @packet_len: (total) length of the OGM
 772  * @if_incoming: interface where the packet was received
 773  * @if_outgoing: interface for which the retransmission should be considered
 774  * @own_packet: true if it is a self-generated ogm
 775  * @send_time: timestamp (jiffies) when the packet is to be sent
 776  */
 777 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 778                                     unsigned char *packet_buff,
 779                                     int packet_len,
 780                                     struct batadv_hard_iface *if_incoming,
 781                                     struct batadv_hard_iface *if_outgoing,
 782                                     int own_packet, unsigned long send_time)
 783 {
 784         /* _aggr -> pointer to the packet we want to aggregate with
 785          * _pos -> pointer to the position in the queue
 786          */
 787         struct batadv_forw_packet *forw_packet_aggr = NULL;
 788         struct batadv_forw_packet *forw_packet_pos = NULL;
 789         struct batadv_ogm_packet *batadv_ogm_packet;
 790         bool direct_link;
 791         unsigned long max_aggregation_jiffies;
 792
 793         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 794         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 795         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 796
 797         /* find position for the packet in the forward queue */
 798         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 799         /* own packets are not to be aggregated */
 800         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 801                 hlist_for_each_entry(forw_packet_pos,
 802                                      &bat_priv->forw_bat_list, list) {
 803                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 804                                                         bat_priv, packet_len,
 805                                                         send_time, direct_link,
 806                                                         if_incoming,
 807                                                         if_outgoing,
 808                                                         forw_packet_pos)) {
 809                                 forw_packet_aggr = forw_packet_pos;
 810                                 break;
 811                         }
 812                 }
 813         }
 814
 815         /* nothing to aggregate with - either aggregation disabled or no
 816          * suitable aggregation packet found
 817          */
 818         if (!forw_packet_aggr) {
 819                 /* the following section can run without the lock */
 820                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 821
 822                 /* if we could not aggregate this packet with one of the others
 823                  * we hold it back for a while, so that it might be aggregated
 824                  * later on
 825                  */
 826                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 827                         send_time += max_aggregation_jiffies;
 828
 829                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 830                                             send_time, direct_link,
 831                                             if_incoming, if_outgoing,
 832                                             own_packet);
 833         } else {
 834                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 835                                         packet_len, direct_link);
 836                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 837         }
 838 }
 839
 840 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 841                                   const struct ethhdr *ethhdr,
 842                                   struct batadv_ogm_packet *batadv_ogm_packet,
 843                                   bool is_single_hop_neigh,
 844                                   bool is_from_best_next_hop,
 845                                   struct batadv_hard_iface *if_incoming,
 846                                   struct batadv_hard_iface *if_outgoing)
 847 {
 848         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 849         u16 tvlv_len;
 850
 851         if (batadv_ogm_packet->ttl <= 1) {
 852                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 853                 return;
 854         }
 855
 856         if (!is_from_best_next_hop) {
 857                 /* Mark the forwarded packet when it is not coming from our
 858                  * best next hop. We still need to forward the packet for our
 859                  * neighbor link quality detection to work in case the packet
 860                  * originated from a single hop neighbor. Otherwise we can
 861                  * simply drop the ogm.
 862                  */
 863                 if (is_single_hop_neigh)
 864                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 865                 else
 866                         return;
 867         }
 868
 869         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 870
 871         batadv_ogm_packet->ttl--;
 872         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 873
 874         /* apply hop penalty */
 875         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 876                                                    bat_priv);
 877
 878         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 879                    "Forwarding packet: tq: %i, ttl: %i\n",
 880                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 881
 882         /* switch of primaries first hop flag when forwarding */
 883         batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
 884         if (is_single_hop_neigh)
 885                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 886         else
 887                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 888
 889         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 890                                 BATADV_OGM_HLEN + tvlv_len,
 891                                 if_incoming, if_outgoing, 0,
 892                                 batadv_iv_ogm_fwd_send_time());
 893 }
 894
 895 /**
 896  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 897  * the given interface
 898  * @hard_iface: the interface for which the windows have to be shifted
 899  */
 900 static void
 901 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 902 {
 903         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 904         struct batadv_hashtable *hash = bat_priv->orig_hash;
 905         struct hlist_head *head;
 906         struct batadv_orig_node *orig_node;
 907         unsigned long *word;
 908         u32 i;
 909         size_t word_index;
 910         u8 *w;
 911         unsigned int if_num;
 912
 913         for (i = 0; i < hash->size; i++) {
 914                 head = &hash->table[i];
 915
 916                 rcu_read_lock();
 917                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 918                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 919                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 920                         word = &orig_node->bat_iv.bcast_own[word_index];
 921
 922                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 923                         if_num = hard_iface->if_num;
 924                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 925                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 926                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 927                 }
 928                 rcu_read_unlock();
 929         }
 930 }
 931
 932 /**
 933  * batadv_iv_ogm_schedule_buff() - schedule submission of hardif ogm buffer
 934  * @hard_iface: interface whose ogm buffer should be transmitted
 935  */
 936 static void batadv_iv_ogm_schedule_buff(struct batadv_hard_iface *hard_iface)
 937 {
 938         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 939         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 940         struct batadv_ogm_packet *batadv_ogm_packet;
 941         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 942         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 943         u32 seqno;
 944         u16 tvlv_len = 0;
 945         unsigned long send_time;
 946
 947         lockdep_assert_held(&hard_iface->bat_iv.ogm_buff_mutex);
 948
 949         /* interface already disabled by batadv_iv_ogm_iface_disable */
 950         if (!*ogm_buff)
 951                 return;
 952
 953         primary_if = batadv_primary_if_get_selected(bat_priv);
 954
 955         if (hard_iface == primary_if) {
 956                 /* tt changes have to be committed before the tvlv data is
 957                  * appended as it may alter the tt tvlv container
 958                  */
 959                 batadv_tt_local_commit_changes(bat_priv);
 960                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 961                                                             ogm_buff_len,
 962                                                             BATADV_OGM_HLEN);
 963         }
 964
 965         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 966         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 967
 968         /* change sequence number to network order */
 969         seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 970         batadv_ogm_packet->seqno = htonl(seqno);
 971         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 972
 973         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 974
 975         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 976
 977         if (hard_iface != primary_if) {
 978                 /* OGMs from secondary interfaces are only scheduled on their
 979                  * respective interfaces.
 980                  */
 981                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 982                                         hard_iface, hard_iface, 1, send_time);
 983                 goto out;
 984         }
 985
 986         /* OGMs from primary interfaces are scheduled on all
 987          * interfaces.
 988          */
 989         rcu_read_lock();
 990         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 991                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 992                         continue;
 993                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 994                                         *ogm_buff_len, hard_iface,
 995                                         tmp_hard_iface, 1, send_time);
 996         }
 997         rcu_read_unlock();
 998
 999 out:
1000         if (primary_if)
1001                 batadv_hardif_free_ref(primary_if);
1002 }
1003
1004 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
1005 {
1006         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE ||
1007             hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)
1008                 return;
1009
1010         mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
1011         batadv_iv_ogm_schedule_buff(hard_iface);
1012         mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
1013 }
1014
1015 /**
1016  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
1017  *  originator
1018  * @bat_priv: the bat priv with all the soft interface information
1019  * @orig_node: the orig node who originally emitted the ogm packet
1020  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
1021  * @ethhdr: Ethernet header of the OGM
1022  * @batadv_ogm_packet: the ogm packet
1023  * @if_incoming: interface where the packet was received
1024  * @if_outgoing: interface for which the retransmission should be considered
1025  * @dup_status: the duplicate status of this ogm packet.
1026  */
1027 static void
1028 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
1029                           struct batadv_orig_node *orig_node,
1030                           struct batadv_orig_ifinfo *orig_ifinfo,
1031                           const struct ethhdr *ethhdr,
1032                           const struct batadv_ogm_packet *batadv_ogm_packet,
1033                           struct batadv_hard_iface *if_incoming,
1034                           struct batadv_hard_iface *if_outgoing,
1035                           enum batadv_dup_status dup_status)
1036 {
1037         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
1038         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1039         struct batadv_neigh_node *neigh_node = NULL;
1040         struct batadv_neigh_node *tmp_neigh_node = NULL;
1041         struct batadv_neigh_node *router = NULL;
1042         struct batadv_orig_node *orig_node_tmp;
1043         unsigned int if_num;
1044         u8 sum_orig, sum_neigh;
1045         u8 *neigh_addr;
1046         u8 tq_avg;
1047
1048         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1049                    "update_originator(): Searching and updating originator entry of received packet\n");
1050
1051         rcu_read_lock();
1052         hlist_for_each_entry_rcu(tmp_neigh_node,
1053                                  &orig_node->neigh_list, list) {
1054                 neigh_addr = tmp_neigh_node->addr;
1055                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1056                     tmp_neigh_node->if_incoming == if_incoming &&
1057                     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
1058                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1059                                 batadv_neigh_node_free_ref(neigh_node);
1060                         neigh_node = tmp_neigh_node;
1061                         continue;
1062                 }
1063
1064                 if (dup_status != BATADV_NO_DUP)
1065                         continue;
1066
1067                 /* only update the entry for this outgoing interface */
1068                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1069                                                        if_outgoing);
1070                 if (!neigh_ifinfo)
1071                         continue;
1072
1073                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1074                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1075                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1076                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1077                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1078                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1079
1080                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1081                 neigh_ifinfo = NULL;
1082         }
1083
1084         if (!neigh_node) {
1085                 struct batadv_orig_node *orig_tmp;
1086
1087                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1088                 if (!orig_tmp)
1089                         goto unlock;
1090
1091                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1092                                                      ethhdr->h_source,
1093                                                      orig_node, orig_tmp);
1094
1095                 batadv_orig_node_free_ref(orig_tmp);
1096                 if (!neigh_node)
1097                         goto unlock;
1098         } else {
1099                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1100                            "Updating existing last-hop neighbor of originator\n");
1101         }
1102
1103         rcu_read_unlock();
1104         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1105         if (!neigh_ifinfo)
1106                 goto out;
1107
1108         neigh_node->last_seen = jiffies;
1109
1110         spin_lock_bh(&neigh_node->ifinfo_lock);
1111         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1112                                &neigh_ifinfo->bat_iv.tq_index,
1113                                batadv_ogm_packet->tq);
1114         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1115         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1116         spin_unlock_bh(&neigh_node->ifinfo_lock);
1117
1118         if (dup_status == BATADV_NO_DUP) {
1119                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1120                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1121         }
1122
1123         /* if this neighbor already is our next hop there is nothing
1124          * to change
1125          */
1126         router = batadv_orig_router_get(orig_node, if_outgoing);
1127         if (router == neigh_node)
1128                 goto out;
1129
1130         if (router) {
1131                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1132                 if (!router_ifinfo)
1133                         goto out;
1134
1135                 /* if this neighbor does not offer a better TQ we won't
1136                  * consider it
1137                  */
1138                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1139                         goto out;
1140         }
1141
1142         /* if the TQ is the same and the link not more symmetric we
1143          * won't consider it either
1144          */
1145         if (router_ifinfo &&
1146             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1147                 orig_node_tmp = router->orig_node;
1148                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1149                 if_num = router->if_incoming->if_num;
1150                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1151                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1152
1153                 orig_node_tmp = neigh_node->orig_node;
1154                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1155                 if_num = neigh_node->if_incoming->if_num;
1156                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1157                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1158
1159                 if (sum_orig >= sum_neigh)
1160                         goto out;
1161         }
1162
1163         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1164         goto out;
1165
1166 unlock:
1167         rcu_read_unlock();
1168 out:
1169         if (neigh_node)
1170                 batadv_neigh_node_free_ref(neigh_node);
1171         if (router)
1172                 batadv_neigh_node_free_ref(router);
1173         if (neigh_ifinfo)
1174                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1175         if (router_ifinfo)
1176                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1177 }
1178
1179 /**
1180  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1181  * @orig_node: the orig node who originally emitted the ogm packet
1182  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1183  * @batadv_ogm_packet: the ogm packet
1184  * @if_incoming: interface where the packet was received
1185  * @if_outgoing: interface for which the retransmission should be considered
1186  *
1187  * Returns 1 if the link can be considered bidirectional, 0 otherwise
1188  */
1189 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1190                                  struct batadv_orig_node *orig_neigh_node,
1191                                  struct batadv_ogm_packet *batadv_ogm_packet,
1192                                  struct batadv_hard_iface *if_incoming,
1193                                  struct batadv_hard_iface *if_outgoing)
1194 {
1195         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1196         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1197         struct batadv_neigh_ifinfo *neigh_ifinfo;
1198         u8 total_count;
1199         u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1200         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1201         int if_num, ret = 0;
1202         unsigned int tq_asym_penalty, inv_asym_penalty;
1203         unsigned int combined_tq;
1204         unsigned int tq_iface_penalty;
1205
1206         /* find corresponding one hop neighbor */
1207         rcu_read_lock();
1208         hlist_for_each_entry_rcu(tmp_neigh_node,
1209                                  &orig_neigh_node->neigh_list, list) {
1210                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1211                                         orig_neigh_node->orig))
1212                         continue;
1213
1214                 if (tmp_neigh_node->if_incoming != if_incoming)
1215                         continue;
1216
1217                 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1218                         continue;
1219
1220                 neigh_node = tmp_neigh_node;
1221                 break;
1222         }
1223         rcu_read_unlock();
1224
1225         if (!neigh_node)
1226                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1227                                                      orig_neigh_node->orig,
1228                                                      orig_neigh_node,
1229                                                      orig_neigh_node);
1230
1231         if (!neigh_node)
1232                 goto out;
1233
1234         /* if orig_node is direct neighbor update neigh_node last_seen */
1235         if (orig_node == orig_neigh_node)
1236                 neigh_node->last_seen = jiffies;
1237
1238         orig_node->last_seen = jiffies;
1239
1240         /* find packet count of corresponding one hop neighbor */
1241         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1242         if_num = if_incoming->if_num;
1243         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1244         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1245         if (neigh_ifinfo) {
1246                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1247                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1248         } else {
1249                 neigh_rq_count = 0;
1250         }
1251         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1252
1253         /* pay attention to not get a value bigger than 100 % */
1254         if (orig_eq_count > neigh_rq_count)
1255                 total_count = neigh_rq_count;
1256         else
1257                 total_count = orig_eq_count;
1258
1259         /* if we have too few packets (too less data) we set tq_own to zero
1260          * if we receive too few packets it is not considered bidirectional
1261          */
1262         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1263             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1264                 tq_own = 0;
1265         else
1266                 /* neigh_node->real_packet_count is never zero as we
1267                  * only purge old information when getting new
1268                  * information
1269                  */
1270                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1271
1272         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1273          * affect the nearly-symmetric links only a little, but
1274          * punishes asymmetric links more.  This will give a value
1275          * between 0 and TQ_MAX_VALUE
1276          */
1277         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1278         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1279         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1280                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1281                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1282         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1283         inv_asym_penalty /= neigh_rq_max_cube;
1284         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1285
1286         /* penalize if the OGM is forwarded on the same interface. WiFi
1287          * interfaces and other half duplex devices suffer from throughput
1288          * drops as they can't send and receive at the same time.
1289          */
1290         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1291         if (if_outgoing && (if_incoming == if_outgoing) &&
1292             batadv_is_wifi_netdev(if_outgoing->net_dev))
1293                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1294                                                       bat_priv);
1295
1296         combined_tq = batadv_ogm_packet->tq *
1297                       tq_own *
1298                       tq_asym_penalty *
1299                       tq_iface_penalty;
1300         combined_tq /= BATADV_TQ_MAX_VALUE *
1301                        BATADV_TQ_MAX_VALUE *
1302                        BATADV_TQ_MAX_VALUE;
1303         batadv_ogm_packet->tq = combined_tq;
1304
1305         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1306                    "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",
1307                    orig_node->orig, orig_neigh_node->orig, total_count,
1308                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1309                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1310                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1311
1312         /* if link has the minimum required transmission quality
1313          * consider it bidirectional
1314          */
1315         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1316                 ret = 1;
1317
1318 out:
1319         if (neigh_node)
1320                 batadv_neigh_node_free_ref(neigh_node);
1321         return ret;
1322 }
1323
1324 /**
1325  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1326  *  adjust the sequence number and find out whether it is a duplicate
1327  * @ethhdr: ethernet header of the packet
1328  * @batadv_ogm_packet: OGM packet to be considered
1329  * @if_incoming: interface on which the OGM packet was received
1330  * @if_outgoing: interface for which the retransmission should be considered
1331  *
1332  * Returns duplicate status as enum batadv_dup_status
1333  */
1334 static enum batadv_dup_status
1335 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1336                             const struct batadv_ogm_packet *batadv_ogm_packet,
1337                             const struct batadv_hard_iface *if_incoming,
1338                             struct batadv_hard_iface *if_outgoing)
1339 {
1340         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1341         struct batadv_orig_node *orig_node;
1342         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1343         struct batadv_neigh_node *neigh_node;
1344         struct batadv_neigh_ifinfo *neigh_ifinfo;
1345         int is_dup;
1346         s32 seq_diff;
1347         int need_update = 0;
1348         int set_mark;
1349         enum batadv_dup_status ret = BATADV_NO_DUP;
1350         u32 seqno = ntohl(batadv_ogm_packet->seqno);
1351         u8 *neigh_addr;
1352         u8 packet_count;
1353         unsigned long *bitmap;
1354
1355         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1356         if (!orig_node)
1357                 return BATADV_NO_DUP;
1358
1359         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1360         if (WARN_ON(!orig_ifinfo)) {
1361                 batadv_orig_node_free_ref(orig_node);
1362                 return 0;
1363         }
1364
1365         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1366         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1367
1368         /* signalize caller that the packet is to be dropped. */
1369         if (!hlist_empty(&orig_node->neigh_list) &&
1370             batadv_window_protected(bat_priv, seq_diff,
1371                                     &orig_ifinfo->batman_seqno_reset)) {
1372                 ret = BATADV_PROTECTED;
1373                 goto out;
1374         }
1375
1376         rcu_read_lock();
1377         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1378                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1379                                                        if_outgoing);
1380                 if (!neigh_ifinfo)
1381                         continue;
1382
1383                 neigh_addr = neigh_node->addr;
1384                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1385                                          orig_ifinfo->last_real_seqno,
1386                                          seqno);
1387
1388                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1389                     neigh_node->if_incoming == if_incoming) {
1390                         set_mark = 1;
1391                         if (is_dup)
1392                                 ret = BATADV_NEIGH_DUP;
1393                 } else {
1394                         set_mark = 0;
1395                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1396                                 ret = BATADV_ORIG_DUP;
1397                 }
1398
1399                 /* if the window moved, set the update flag. */
1400                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1401                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1402                                                      seq_diff, set_mark);
1403
1404                 packet_count = bitmap_weight(bitmap,
1405                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1406                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1407                 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1408         }
1409         rcu_read_unlock();
1410
1411         if (need_update) {
1412                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1413                            "%s updating last_seqno: old %u, new %u\n",
1414                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1415                            orig_ifinfo->last_real_seqno, seqno);
1416                 orig_ifinfo->last_real_seqno = seqno;
1417         }
1418
1419 out:
1420         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1421         batadv_orig_node_free_ref(orig_node);
1422         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1423         return ret;
1424 }
1425
1426 /**
1427  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1428  * @skb: the skb containing the OGM
1429  * @ogm_offset: offset from skb->data to start of ogm header
1430  * @orig_node: the (cached) orig node for the originator of this OGM
1431  * @if_incoming: the interface where this packet was received
1432  * @if_outgoing: the interface for which the packet should be considered
1433  */
1434 static void
1435 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1436                                 struct batadv_orig_node *orig_node,
1437                                 struct batadv_hard_iface *if_incoming,
1438                                 struct batadv_hard_iface *if_outgoing)
1439 {
1440         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1441         struct batadv_neigh_node *router = NULL;
1442         struct batadv_neigh_node *router_router = NULL;
1443         struct batadv_orig_node *orig_neigh_node;
1444         struct batadv_orig_ifinfo *orig_ifinfo;
1445         struct batadv_neigh_node *orig_neigh_router = NULL;
1446         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1447         struct batadv_ogm_packet *ogm_packet;
1448         enum batadv_dup_status dup_status;
1449         bool is_from_best_next_hop = false;
1450         bool is_single_hop_neigh = false;
1451         bool sameseq, similar_ttl;
1452         struct sk_buff *skb_priv;
1453         struct ethhdr *ethhdr;
1454         u8 *prev_sender;
1455         int is_bidirect;
1456
1457         /* create a private copy of the skb, as some functions change tq value
1458          * and/or flags.
1459          */
1460         skb_priv = skb_copy(skb, GFP_ATOMIC);
1461         if (!skb_priv)
1462                 return;
1463
1464         ethhdr = eth_hdr(skb_priv);
1465         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1466
1467         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1468                                                  if_incoming, if_outgoing);
1469         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1470                 is_single_hop_neigh = true;
1471
1472         if (dup_status == BATADV_PROTECTED) {
1473                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1474                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1475                            ethhdr->h_source);
1476                 goto out;
1477         }
1478
1479         if (ogm_packet->tq == 0) {
1480                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1481                            "Drop packet: originator packet with tq equal 0\n");
1482                 goto out;
1483         }
1484
1485         router = batadv_orig_router_get(orig_node, if_outgoing);
1486         if (router) {
1487                 router_router = batadv_orig_router_get(router->orig_node,
1488                                                        if_outgoing);
1489                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1490         }
1491
1492         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1493             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1494                 is_from_best_next_hop = true;
1495
1496         prev_sender = ogm_packet->prev_sender;
1497         /* avoid temporary routing loops */
1498         if (router && router_router &&
1499             (batadv_compare_eth(router->addr, prev_sender)) &&
1500             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1501             (batadv_compare_eth(router->addr, router_router->addr))) {
1502                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1503                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1504                            ethhdr->h_source);
1505                 goto out;
1506         }
1507
1508         if (if_outgoing == BATADV_IF_DEFAULT)
1509                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1510
1511         /* if sender is a direct neighbor the sender mac equals
1512          * originator mac
1513          */
1514         if (is_single_hop_neigh)
1515                 orig_neigh_node = orig_node;
1516         else
1517                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1518                                                          ethhdr->h_source);
1519
1520         if (!orig_neigh_node)
1521                 goto out;
1522
1523         /* Update nc_nodes of the originator */
1524         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1525                                  ogm_packet, is_single_hop_neigh);
1526
1527         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1528                                                    if_outgoing);
1529
1530         /* drop packet if sender is not a direct neighbor and if we
1531          * don't route towards it
1532          */
1533         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1534                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1535                            "Drop packet: OGM via unknown neighbor!\n");
1536                 goto out_neigh;
1537         }
1538
1539         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1540                                             ogm_packet, if_incoming,
1541                                             if_outgoing);
1542
1543         /* update ranking if it is not a duplicate or has the same
1544          * seqno and similar ttl as the non-duplicate
1545          */
1546         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1547         if (!orig_ifinfo)
1548                 goto out_neigh;
1549
1550         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1551         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1552
1553         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1554                             (sameseq && similar_ttl))) {
1555                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1556                                           orig_ifinfo, ethhdr,
1557                                           ogm_packet, if_incoming,
1558                                           if_outgoing, dup_status);
1559         }
1560         batadv_orig_ifinfo_free_ref(orig_ifinfo);
1561
1562         /* only forward for specific interface, not for the default one. */
1563         if (if_outgoing == BATADV_IF_DEFAULT)
1564                 goto out_neigh;
1565
1566         /* is single hop (direct) neighbor */
1567         if (is_single_hop_neigh) {
1568                 /* OGMs from secondary interfaces should only scheduled once
1569                  * per interface where it has been received, not multiple times
1570                  */
1571                 if ((ogm_packet->ttl <= 2) &&
1572                     (if_incoming != if_outgoing)) {
1573                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1574                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1575                         goto out_neigh;
1576                 }
1577                 /* mark direct link on incoming interface */
1578                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1579                                       is_single_hop_neigh,
1580                                       is_from_best_next_hop, if_incoming,
1581                                       if_outgoing);
1582
1583                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1584                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1585                 goto out_neigh;
1586         }
1587
1588         /* multihop originator */
1589         if (!is_bidirect) {
1590                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1591                            "Drop packet: not received via bidirectional link\n");
1592                 goto out_neigh;
1593         }
1594
1595         if (dup_status == BATADV_NEIGH_DUP) {
1596                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1597                            "Drop packet: duplicate packet received\n");
1598                 goto out_neigh;
1599         }
1600
1601         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1602                    "Forwarding packet: rebroadcast originator packet\n");
1603         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1604                               is_single_hop_neigh, is_from_best_next_hop,
1605                               if_incoming, if_outgoing);
1606
1607 out_neigh:
1608         if ((orig_neigh_node) && (!is_single_hop_neigh))
1609                 batadv_orig_node_free_ref(orig_neigh_node);
1610 out:
1611         if (router_ifinfo)
1612                 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1613         if (router)
1614                 batadv_neigh_node_free_ref(router);
1615         if (router_router)
1616                 batadv_neigh_node_free_ref(router_router);
1617         if (orig_neigh_router)
1618                 batadv_neigh_node_free_ref(orig_neigh_router);
1619
1620         kfree_skb(skb_priv);
1621 }
1622
1623 /**
1624  * batadv_iv_ogm_process - process an incoming batman iv OGM
1625  * @skb: the skb containing the OGM
1626  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1627  * @if_incoming: the interface where this packet was receved
1628  */
1629 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1630                                   struct batadv_hard_iface *if_incoming)
1631 {
1632         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1633         struct batadv_orig_node *orig_neigh_node, *orig_node;
1634         struct batadv_hard_iface *hard_iface;
1635         struct batadv_ogm_packet *ogm_packet;
1636         u32 if_incoming_seqno;
1637         bool has_directlink_flag;
1638         struct ethhdr *ethhdr;
1639         bool is_my_oldorig = false;
1640         bool is_my_addr = false;
1641         bool is_my_orig = false;
1642
1643         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1644         ethhdr = eth_hdr(skb);
1645
1646         /* Silently drop when the batman packet is actually not a
1647          * correct packet.
1648          *
1649          * This might happen if a packet is padded (e.g. Ethernet has a
1650          * minimum frame length of 64 byte) and the aggregation interprets
1651          * it as an additional length.
1652          *
1653          * TODO: A more sane solution would be to have a bit in the
1654          * batadv_ogm_packet to detect whether the packet is the last
1655          * packet in an aggregation.  Here we expect that the padding
1656          * is always zero (or not 0x01)
1657          */
1658         if (ogm_packet->packet_type != BATADV_IV_OGM)
1659                 return;
1660
1661         /* could be changed by schedule_own_packet() */
1662         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1663
1664         if (ogm_packet->flags & BATADV_DIRECTLINK)
1665                 has_directlink_flag = true;
1666         else
1667                 has_directlink_flag = false;
1668
1669         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1670                    "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",
1671                    ethhdr->h_source, if_incoming->net_dev->name,
1672                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1673                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1674                    ogm_packet->tq, ogm_packet->ttl,
1675                    ogm_packet->version, has_directlink_flag);
1676
1677         rcu_read_lock();
1678         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1679                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1680                         continue;
1681
1682                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1683                         continue;
1684
1685                 if (batadv_compare_eth(ethhdr->h_source,
1686                                        hard_iface->net_dev->dev_addr))
1687                         is_my_addr = true;
1688
1689                 if (batadv_compare_eth(ogm_packet->orig,
1690                                        hard_iface->net_dev->dev_addr))
1691                         is_my_orig = true;
1692
1693                 if (batadv_compare_eth(ogm_packet->prev_sender,
1694                                        hard_iface->net_dev->dev_addr))
1695                         is_my_oldorig = true;
1696         }
1697         rcu_read_unlock();
1698
1699         if (is_my_addr) {
1700                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1701                            "Drop packet: received my own broadcast (sender: %pM)\n",
1702                            ethhdr->h_source);
1703                 return;
1704         }
1705
1706         if (is_my_orig) {
1707                 unsigned long *word;
1708                 size_t offset;
1709                 s32 bit_pos;
1710                 unsigned int if_num;
1711                 u8 *weight;
1712
1713                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1714                                                          ethhdr->h_source);
1715                 if (!orig_neigh_node)
1716                         return;
1717
1718                 /* neighbor has to indicate direct link and it has to
1719                  * come via the corresponding interface
1720                  * save packet seqno for bidirectional check
1721                  */
1722                 if (has_directlink_flag &&
1723                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1724                                        ogm_packet->orig)) {
1725                         if_num = if_incoming->if_num;
1726                         offset = if_num * BATADV_NUM_WORDS;
1727
1728                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1729                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1730                         bit_pos = if_incoming_seqno - 2;
1731                         bit_pos -= ntohl(ogm_packet->seqno);
1732                         batadv_set_bit(word, bit_pos);
1733                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1734                         *weight = bitmap_weight(word,
1735                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1736                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1737                 }
1738
1739                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1740                            "Drop packet: originator packet from myself (via neighbor)\n");
1741                 batadv_orig_node_free_ref(orig_neigh_node);
1742                 return;
1743         }
1744
1745         if (is_my_oldorig) {
1746                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1747                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1748                            ethhdr->h_source);
1749                 return;
1750         }
1751
1752         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1753                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1754                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1755                            ethhdr->h_source);
1756                 return;
1757         }
1758
1759         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1760         if (!orig_node)
1761                 return;
1762
1763         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1764                                         if_incoming, BATADV_IF_DEFAULT);
1765
1766         rcu_read_lock();
1767         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1768                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1769                         continue;
1770
1771                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1772                         continue;
1773
1774                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1775                                                 if_incoming, hard_iface);
1776         }
1777         rcu_read_unlock();
1778
1779         batadv_orig_node_free_ref(orig_node);
1780 }
1781
1782 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1783                                  struct batadv_hard_iface *if_incoming)
1784 {
1785         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1786         struct batadv_ogm_packet *ogm_packet;
1787         u8 *packet_pos;
1788         int ogm_offset;
1789         bool ret;
1790
1791         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1792         if (!ret)
1793                 return NET_RX_DROP;
1794
1795         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1796          * that does not have B.A.T.M.A.N. IV enabled ?
1797          */
1798         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1799                 return NET_RX_DROP;
1800
1801         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1802         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1803                            skb->len + ETH_HLEN);
1804
1805         ogm_offset = 0;
1806         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1807
1808         /* unpack the aggregated packets and process them one by one */
1809         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1810                                          ogm_packet)) {
1811                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1812
1813                 ogm_offset += BATADV_OGM_HLEN;
1814                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1815
1816                 packet_pos = skb->data + ogm_offset;
1817                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1818         }
1819
1820         kfree_skb(skb);
1821         return NET_RX_SUCCESS;
1822 }
1823
1824 /**
1825  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1826  * @orig_node: the orig_node for which the neighbors are printed
1827  * @if_outgoing: outgoing interface for these entries
1828  * @seq: debugfs table seq_file struct
1829  *
1830  * Must be called while holding an rcu lock.
1831  */
1832 static void
1833 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1834                                struct batadv_hard_iface *if_outgoing,
1835                                struct seq_file *seq)
1836 {
1837         struct batadv_neigh_node *neigh_node;
1838         struct batadv_neigh_ifinfo *n_ifinfo;
1839
1840         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1841                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1842                 if (!n_ifinfo)
1843                         continue;
1844
1845                 seq_printf(seq, " %pM (%3i)",
1846                            neigh_node->addr,
1847                            n_ifinfo->bat_iv.tq_avg);
1848
1849                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1850         }
1851 }
1852
1853 /**
1854  * batadv_iv_ogm_orig_print - print the originator table
1855  * @bat_priv: the bat priv with all the soft interface information
1856  * @seq: debugfs table seq_file struct
1857  * @if_outgoing: the outgoing interface for which this should be printed
1858  */
1859 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1860                                      struct seq_file *seq,
1861                                      struct batadv_hard_iface *if_outgoing)
1862 {
1863         struct batadv_neigh_node *neigh_node;
1864         struct batadv_hashtable *hash = bat_priv->orig_hash;
1865         int last_seen_msecs, last_seen_secs;
1866         struct batadv_orig_node *orig_node;
1867         struct batadv_neigh_ifinfo *n_ifinfo;
1868         unsigned long last_seen_jiffies;
1869         struct hlist_head *head;
1870         int batman_count = 0;
1871         u32 i;
1872
1873         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1874                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1875                    "Nexthop", "outgoingIF", "Potential nexthops");
1876
1877         for (i = 0; i < hash->size; i++) {
1878                 head = &hash->table[i];
1879
1880                 rcu_read_lock();
1881                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1882                         neigh_node = batadv_orig_router_get(orig_node,
1883                                                             if_outgoing);
1884                         if (!neigh_node)
1885                                 continue;
1886
1887                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1888                                                            if_outgoing);
1889                         if (!n_ifinfo)
1890                                 goto next;
1891
1892                         if (n_ifinfo->bat_iv.tq_avg == 0)
1893                                 goto next;
1894
1895                         last_seen_jiffies = jiffies - orig_node->last_seen;
1896                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1897                         last_seen_secs = last_seen_msecs / 1000;
1898                         last_seen_msecs = last_seen_msecs % 1000;
1899
1900                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1901                                    orig_node->orig, last_seen_secs,
1902                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1903                                    neigh_node->addr,
1904                                    neigh_node->if_incoming->net_dev->name);
1905
1906                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1907                                                        seq);
1908                         seq_puts(seq, "\n");
1909                         batman_count++;
1910
1911 next:
1912                         batadv_neigh_node_free_ref(neigh_node);
1913                         if (n_ifinfo)
1914                                 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1915                 }
1916                 rcu_read_unlock();
1917         }
1918
1919         if (batman_count == 0)
1920                 seq_puts(seq, "No batman nodes in range ...\n");
1921 }
1922
1923 /**
1924  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1925  * @neigh1: the first neighbor object of the comparison
1926  * @if_outgoing1: outgoing interface for the first neighbor
1927  * @neigh2: the second neighbor object of the comparison
1928  * @if_outgoing2: outgoing interface for the second neighbor
1929  *
1930  * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1931  * lower, the same as or higher than the metric via neigh2
1932  */
1933 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1934                                    struct batadv_hard_iface *if_outgoing1,
1935                                    struct batadv_neigh_node *neigh2,
1936                                    struct batadv_hard_iface *if_outgoing2)
1937 {
1938         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1939         u8 tq1, tq2;
1940         int diff;
1941
1942         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1943         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1944
1945         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1946                 diff = 0;
1947                 goto out;
1948         }
1949
1950         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1951         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1952         diff = tq1 - tq2;
1953
1954 out:
1955         if (neigh1_ifinfo)
1956                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1957         if (neigh2_ifinfo)
1958                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1959
1960         return diff;
1961 }
1962
1963 /**
1964  * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
1965  *  neigh2 from the metric prospective
1966  * @neigh1: the first neighbor object of the comparison
1967  * @if_outgoing1: outgoing interface for the first neighbor
1968  * @neigh2: the second neighbor object of the comparison
1969  * @if_outgoing2: outgoing interface for the second neighbor
1970  *
1971  * Returns true if the metric via neigh1 is equally good or better than
1972  * the metric via neigh2, false otherwise.
1973  */
1974 static bool
1975 batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1,
1976                            struct batadv_hard_iface *if_outgoing1,
1977                            struct batadv_neigh_node *neigh2,
1978                            struct batadv_hard_iface *if_outgoing2)
1979 {
1980         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1981         u8 tq1, tq2;
1982         bool ret;
1983
1984         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1985         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1986
1987         /* we can't say that the metric is better */
1988         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1989                 ret = false;
1990                 goto out;
1991         }
1992
1993         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1994         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1995         ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
1996
1997 out:
1998         if (neigh1_ifinfo)
1999                 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
2000         if (neigh2_ifinfo)
2001                 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
2002
2003         return ret;
2004 }
2005
2006 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
2007         .name = "BATMAN_IV",
2008         .bat_iface_enable = batadv_iv_ogm_iface_enable,
2009         .bat_iface_disable = batadv_iv_ogm_iface_disable,
2010         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
2011         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
2012         .bat_ogm_schedule = batadv_iv_ogm_schedule,
2013         .bat_ogm_emit = batadv_iv_ogm_emit,
2014         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
2015         .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
2016         .bat_orig_print = batadv_iv_ogm_orig_print,
2017         .bat_orig_free = batadv_iv_ogm_orig_free,
2018         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
2019         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
2020 };
2021
2022 int __init batadv_iv_init(void)
2023 {
2024         int ret;
2025
2026         /* batman originator packet */
2027         ret = batadv_recv_handler_register(BATADV_IV_OGM,
2028                                            batadv_iv_ogm_receive);
2029         if (ret < 0)
2030                 goto out;
2031
2032         ret = batadv_algo_register(&batadv_batman_iv);
2033         if (ret < 0)
2034                 goto handler_unregister;
2035
2036         goto out;
2037
2038 handler_unregister:
2039         batadv_recv_handler_unregister(BATADV_IV_OGM);
2040 out:
2041         return ret;
2042 }