net/batman-adv/bat_iv_ogm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2007-2017  B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "bat_iv_ogm.h"
  20 #include "main.h"
  21
  22 #include <linux/atomic.h>
  23 #include <linux/bitmap.h>
  24 #include <linux/bitops.h>
  25 #include <linux/bug.h>
  26 #include <linux/byteorder/generic.h>
  27 #include <linux/cache.h>
  28 #include <linux/errno.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/gfp.h>
  31 #include <linux/if_ether.h>
  32 #include <linux/init.h>
  33 #include <linux/jiffies.h>
  34 #include <linux/kernel.h>
  35 #include <linux/kref.h>
  36 #include <linux/list.h>
  37 #include <linux/lockdep.h>
  38 #include <linux/netdevice.h>
  39 #include <linux/netlink.h>
  40 #include <linux/pkt_sched.h>
  41 #include <linux/printk.h>
  42 #include <linux/random.h>
  43 #include <linux/rculist.h>
  44 #include <linux/rcupdate.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/skbuff.h>
  47 #include <linux/slab.h>
  48 #include <linux/spinlock.h>
  49 #include <linux/stddef.h>
  50 #include <linux/string.h>
  51 #include <linux/types.h>
  52 #include <linux/workqueue.h>
  53 #include <net/genetlink.h>
  54 #include <net/netlink.h>
  55 #include <uapi/linux/batadv_packet.h>
  56 #include <uapi/linux/batman_adv.h>
  57
  58 #include "bat_algo.h"
  59 #include "bitarray.h"
  60 #include "gateway_client.h"
  61 #include "hard-interface.h"
  62 #include "hash.h"
  63 #include "log.h"
  64 #include "netlink.h"
  65 #include "network-coding.h"
  66 #include "originator.h"
  67 #include "routing.h"
  68 #include "send.h"
  69 #include "translation-table.h"
  70 #include "tvlv.h"
  71
  72 static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work);
  73
  74 /**
  75  * enum batadv_dup_status - duplicate status
  76  */
  77 enum batadv_dup_status {
  78         /** @BATADV_NO_DUP: the packet is no duplicate */
  79         BATADV_NO_DUP = 0,
  80
  81         /**
  82          * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for
  83          *  the neighbor)
  84          */
  85         BATADV_ORIG_DUP,
  86
  87         /** @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor */
  88         BATADV_NEIGH_DUP,
  89
  90         /**
  91          * @BATADV_PROTECTED: originator is currently protected (after reboot)
  92          */
  93         BATADV_PROTECTED,
  94 };
  95
  96 /**
  97  * batadv_ring_buffer_set() - update the ring buffer with the given value
  98  * @lq_recv: pointer to the ring buffer
  99  * @lq_index: index to store the value at
 100  * @value: value to store in the ring buffer
 101  */
 102 static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value)
 103 {
 104         lq_recv[*lq_index] = value;
 105         *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
 106 }
 107
 108 /**
 109  * batadv_ring_buffer_avg() - compute the average of all non-zero values stored
 110  * in the given ring buffer
 111  * @lq_recv: pointer to the ring buffer
 112  *
 113  * Return: computed average value.
 114  */
 115 static u8 batadv_ring_buffer_avg(const u8 lq_recv[])
 116 {
 117         const u8 *ptr;
 118         u16 count = 0;
 119         u16 i = 0;
 120         u16 sum = 0;
 121
 122         ptr = lq_recv;
 123
 124         while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
 125                 if (*ptr != 0) {
 126                         count++;
 127                         sum += *ptr;
 128                 }
 129
 130                 i++;
 131                 ptr++;
 132         }
 133
 134         if (count == 0)
 135                 return 0;
 136
 137         return (u8)(sum / count);
 138 }
 139
 140 /**
 141  * batadv_iv_ogm_orig_free() - free the private resources allocated for this
 142  *  orig_node
 143  * @orig_node: the orig_node for which the resources have to be free'd
 144  */
 145 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
 146 {
 147         kfree(orig_node->bat_iv.bcast_own);
 148         kfree(orig_node->bat_iv.bcast_own_sum);
 149 }
 150
 151 /**
 152  * batadv_iv_ogm_orig_add_if() - change the private structures of the orig_node
 153  *  to include the new hard-interface
 154  * @orig_node: the orig_node that has to be changed
 155  * @max_if_num: the current amount of interfaces
 156  *
 157  * Return: 0 on success, a negative error code otherwise.
 158  */
 159 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
 160                                      int max_if_num)
 161 {
 162         void *data_ptr;
 163         size_t old_size;
 164         int ret = -ENOMEM;
 165
 166         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 167
 168         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 169         data_ptr = kmalloc_array(max_if_num,
 170                                  BATADV_NUM_WORDS * sizeof(unsigned long),
 171                                  GFP_ATOMIC);
 172         if (!data_ptr)
 173                 goto unlock;
 174
 175         memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
 176         kfree(orig_node->bat_iv.bcast_own);
 177         orig_node->bat_iv.bcast_own = data_ptr;
 178
 179         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 180         if (!data_ptr)
 181                 goto unlock;
 182
 183         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 184                (max_if_num - 1) * sizeof(u8));
 185         kfree(orig_node->bat_iv.bcast_own_sum);
 186         orig_node->bat_iv.bcast_own_sum = data_ptr;
 187
 188         ret = 0;
 189
 190 unlock:
 191         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 192
 193         return ret;
 194 }
 195
 196 /**
 197  * batadv_iv_ogm_drop_bcast_own_entry() - drop section of bcast_own
 198  * @orig_node: the orig_node that has to be changed
 199  * @max_if_num: the current amount of interfaces
 200  * @del_if_num: the index of the interface being removed
 201  */
 202 static void
 203 batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node,
 204                                    int max_if_num, int del_if_num)
 205 {
 206         size_t chunk_size;
 207         size_t if_offset;
 208         void *data_ptr;
 209
 210         lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);
 211
 212         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 213         data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
 214         if (!data_ptr)
 215                 /* use old buffer when new one could not be allocated */
 216                 data_ptr = orig_node->bat_iv.bcast_own;
 217
 218         /* copy first part */
 219         memmove(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
 220
 221         /* copy second part */
 222         if_offset = (del_if_num + 1) * chunk_size;
 223         memmove((char *)data_ptr + del_if_num * chunk_size,
 224                 (uint8_t *)orig_node->bat_iv.bcast_own + if_offset,
 225                 (max_if_num - del_if_num) * chunk_size);
 226
 227         /* bcast_own was shrunk down in new buffer; free old one */
 228         if (orig_node->bat_iv.bcast_own != data_ptr) {
 229                 kfree(orig_node->bat_iv.bcast_own);
 230                 orig_node->bat_iv.bcast_own = data_ptr;
 231         }
 232 }
 233
 234 /**
 235  * batadv_iv_ogm_drop_bcast_own_sum_entry() - drop section of bcast_own_sum
 236  * @orig_node: the orig_node that has to be changed
 237  * @max_if_num: the current amount of interfaces
 238  * @del_if_num: the index of the interface being removed
 239  */
 240 static void
 241 batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node,
 242                                        int max_if_num, int del_if_num)
 243 {
 244         size_t if_offset;
 245         void *data_ptr;
 246
 247         lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);
 248
 249         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 250         if (!data_ptr)
 251                 /* use old buffer when new one could not be allocated */
 252                 data_ptr = orig_node->bat_iv.bcast_own_sum;
 253
 254         memmove(data_ptr, orig_node->bat_iv.bcast_own_sum,
 255                 del_if_num * sizeof(u8));
 256
 257         if_offset = (del_if_num + 1) * sizeof(u8);
 258         memmove((char *)data_ptr + del_if_num * sizeof(u8),
 259                 orig_node->bat_iv.bcast_own_sum + if_offset,
 260                 (max_if_num - del_if_num) * sizeof(u8));
 261
 262         /* bcast_own_sum was shrunk down in new buffer; free old one */
 263         if (orig_node->bat_iv.bcast_own_sum != data_ptr) {
 264                 kfree(orig_node->bat_iv.bcast_own_sum);
 265                 orig_node->bat_iv.bcast_own_sum = data_ptr;
 266         }
 267 }
 268
 269 /**
 270  * batadv_iv_ogm_orig_del_if() - change the private structures of the orig_node
 271  *  to exclude the removed interface
 272  * @orig_node: the orig_node that has to be changed
 273  * @max_if_num: the current amount of interfaces
 274  * @del_if_num: the index of the interface being removed
 275  *
 276  * Return: 0 on success, a negative error code otherwise.
 277  */
 278 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
 279                                      int max_if_num, int del_if_num)
 280 {
 281         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 282
 283         if (max_if_num == 0) {
 284                 kfree(orig_node->bat_iv.bcast_own);
 285                 kfree(orig_node->bat_iv.bcast_own_sum);
 286                 orig_node->bat_iv.bcast_own = NULL;
 287                 orig_node->bat_iv.bcast_own_sum = NULL;
 288         } else {
 289                 batadv_iv_ogm_drop_bcast_own_entry(orig_node, max_if_num,
 290                                                    del_if_num);
 291                 batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node, max_if_num,
 292                                                        del_if_num);
 293         }
 294
 295         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 296
 297         return 0;
 298 }
 299
 300 /**
 301  * batadv_iv_ogm_orig_get() - retrieve or create (if does not exist) an
 302  *  originator
 303  * @bat_priv: the bat priv with all the soft interface information
 304  * @addr: mac address of the originator
 305  *
 306  * Return: the originator object corresponding to the passed mac address or NULL
 307  * on failure.
 308  * If the object does not exists it is created an initialised.
 309  */
 310 static struct batadv_orig_node *
 311 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr)
 312 {
 313         struct batadv_orig_node *orig_node;
 314         int size, hash_added;
 315
 316         orig_node = batadv_orig_hash_find(bat_priv, addr);
 317         if (orig_node)
 318                 return orig_node;
 319
 320         orig_node = batadv_orig_node_new(bat_priv, addr);
 321         if (!orig_node)
 322                 return NULL;
 323
 324         spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
 325
 326         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 327         orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
 328         if (!orig_node->bat_iv.bcast_own)
 329                 goto free_orig_node;
 330
 331         size = bat_priv->num_ifaces * sizeof(u8);
 332         orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 333         if (!orig_node->bat_iv.bcast_own_sum)
 334                 goto free_orig_node;
 335
 336         kref_get(&orig_node->refcount);
 337         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 338                                      batadv_choose_orig, orig_node,
 339                                      &orig_node->hash_entry);
 340         if (hash_added != 0)
 341                 goto free_orig_node_hash;
 342
 343         return orig_node;
 344
 345 free_orig_node_hash:
 346         batadv_orig_node_put(orig_node);
 347 free_orig_node:
 348         batadv_orig_node_put(orig_node);
 349
 350         return NULL;
 351 }
 352
 353 static struct batadv_neigh_node *
 354 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
 355                         const u8 *neigh_addr,
 356                         struct batadv_orig_node *orig_node,
 357                         struct batadv_orig_node *orig_neigh)
 358 {
 359         struct batadv_neigh_node *neigh_node;
 360
 361         neigh_node = batadv_neigh_node_get_or_create(orig_node,
 362                                                      hard_iface, neigh_addr);
 363         if (!neigh_node)
 364                 goto out;
 365
 366         neigh_node->orig_node = orig_neigh;
 367
 368 out:
 369         return neigh_node;
 370 }
 371
 372 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
 373 {
 374         struct batadv_ogm_packet *batadv_ogm_packet;
 375         unsigned char *ogm_buff;
 376         u32 random_seqno;
 377
 378         /* randomize initial seqno to avoid collision */
 379         get_random_bytes(&random_seqno, sizeof(random_seqno));
 380         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 381
 382         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 383         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 384         if (!ogm_buff)
 385                 return -ENOMEM;
 386
 387         hard_iface->bat_iv.ogm_buff = ogm_buff;
 388
 389         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 390         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 391         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 392         batadv_ogm_packet->ttl = 2;
 393         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 394         batadv_ogm_packet->reserved = 0;
 395         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 396
 397         return 0;
 398 }
 399
 400 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 401 {
 402         kfree(hard_iface->bat_iv.ogm_buff);
 403         hard_iface->bat_iv.ogm_buff = NULL;
 404 }
 405
 406 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 407 {
 408         struct batadv_ogm_packet *batadv_ogm_packet;
 409         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 410
 411         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 412         ether_addr_copy(batadv_ogm_packet->orig,
 413                         hard_iface->net_dev->dev_addr);
 414         ether_addr_copy(batadv_ogm_packet->prev_sender,
 415                         hard_iface->net_dev->dev_addr);
 416 }
 417
 418 static void
 419 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 420 {
 421         struct batadv_ogm_packet *batadv_ogm_packet;
 422         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 423
 424         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 425         batadv_ogm_packet->ttl = BATADV_TTL;
 426 }
 427
 428 /* when do we schedule our own ogm to be sent */
 429 static unsigned long
 430 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 431 {
 432         unsigned int msecs;
 433
 434         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 435         msecs += prandom_u32() % (2 * BATADV_JITTER);
 436
 437         return jiffies + msecs_to_jiffies(msecs);
 438 }
 439
 440 /* when do we schedule a ogm packet to be sent */
 441 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 442 {
 443         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 444 }
 445
 446 /* apply hop penalty for a normal link */
 447 static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv)
 448 {
 449         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 450         int new_tq;
 451
 452         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 453         new_tq /= BATADV_TQ_MAX_VALUE;
 454
 455         return new_tq;
 456 }
 457
 458 /**
 459  * batadv_iv_ogm_aggr_packet() - checks if there is another OGM attached
 460  * @buff_pos: current position in the skb
 461  * @packet_len: total length of the skb
 462  * @tvlv_len: tvlv length of the previously considered OGM
 463  *
 464  * Return: true if there is enough space for another OGM, false otherwise.
 465  */
 466 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 467                                       __be16 tvlv_len)
 468 {
 469         int next_buff_pos = 0;
 470
 471         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 472         next_buff_pos += ntohs(tvlv_len);
 473
 474         return (next_buff_pos <= packet_len) &&
 475                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 476 }
 477
 478 /* send a batman ogm to a given interface */
 479 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 480                                      struct batadv_hard_iface *hard_iface)
 481 {
 482         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 483         const char *fwd_str;
 484         u8 packet_num;
 485         s16 buff_pos;
 486         struct batadv_ogm_packet *batadv_ogm_packet;
 487         struct sk_buff *skb;
 488         u8 *packet_pos;
 489
 490         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 491                 return;
 492
 493         packet_num = 0;
 494         buff_pos = 0;
 495         packet_pos = forw_packet->skb->data;
 496         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 497
 498         /* adjust all flags and log packets */
 499         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 500                                          batadv_ogm_packet->tvlv_len)) {
 501                 /* we might have aggregated direct link packets with an
 502                  * ordinary base packet
 503                  */
 504                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 505                     forw_packet->if_incoming == hard_iface)
 506                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 507                 else
 508                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 509
 510                 if (packet_num > 0 || !forw_packet->own)
 511                         fwd_str = "Forwarding";
 512                 else
 513                         fwd_str = "Sending own";
 514
 515                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 516                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 517                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 518                            batadv_ogm_packet->orig,
 519                            ntohl(batadv_ogm_packet->seqno),
 520                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 521                            ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ?
 522                             "on" : "off"),
 523                            hard_iface->net_dev->name,
 524                            hard_iface->net_dev->dev_addr);
 525
 526                 buff_pos += BATADV_OGM_HLEN;
 527                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 528                 packet_num++;
 529                 packet_pos = forw_packet->skb->data + buff_pos;
 530                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 531         }
 532
 533         /* create clone because function is called more than once */
 534         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 535         if (skb) {
 536                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 537                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 538                                    skb->len + ETH_HLEN);
 539                 batadv_send_broadcast_skb(skb, hard_iface);
 540         }
 541 }
 542
 543 /* send a batman ogm packet */
 544 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 545 {
 546         struct net_device *soft_iface;
 547
 548         if (!forw_packet->if_incoming) {
 549                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 550                 return;
 551         }
 552
 553         soft_iface = forw_packet->if_incoming->soft_iface;
 554
 555         if (WARN_ON(!forw_packet->if_outgoing))
 556                 return;
 557
 558         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 559                 return;
 560
 561         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 562                 return;
 563
 564         /* only for one specific outgoing interface */
 565         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 566 }
 567
 568 /**
 569  * batadv_iv_ogm_can_aggregate() - find out if an OGM can be aggregated on an
 570  *  existing forward packet
 571  * @new_bat_ogm_packet: OGM packet to be aggregated
 572  * @bat_priv: the bat priv with all the soft interface information
 573  * @packet_len: (total) length of the OGM
 574  * @send_time: timestamp (jiffies) when the packet is to be sent
 575  * @directlink: true if this is a direct link packet
 576  * @if_incoming: interface where the packet was received
 577  * @if_outgoing: interface for which the retransmission should be considered
 578  * @forw_packet: the forwarded packet which should be checked
 579  *
 580  * Return: true if new_packet can be aggregated with forw_packet
 581  */
 582 static bool
 583 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 584                             struct batadv_priv *bat_priv,
 585                             int packet_len, unsigned long send_time,
 586                             bool directlink,
 587                             const struct batadv_hard_iface *if_incoming,
 588                             const struct batadv_hard_iface *if_outgoing,
 589                             const struct batadv_forw_packet *forw_packet)
 590 {
 591         struct batadv_ogm_packet *batadv_ogm_packet;
 592         int aggregated_bytes = forw_packet->packet_len + packet_len;
 593         struct batadv_hard_iface *primary_if = NULL;
 594         bool res = false;
 595         unsigned long aggregation_end_time;
 596
 597         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 598         aggregation_end_time = send_time;
 599         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 600
 601         /* we can aggregate the current packet to this aggregated packet
 602          * if:
 603          *
 604          * - the send time is within our MAX_AGGREGATION_MS time
 605          * - the resulting packet wont be bigger than
 606          *   MAX_AGGREGATION_BYTES
 607          * otherwise aggregation is not possible
 608          */
 609         if (!time_before(send_time, forw_packet->send_time) ||
 610             !time_after_eq(aggregation_end_time, forw_packet->send_time))
 611                 return false;
 612
 613         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
 614                 return false;
 615
 616         /* packet is not leaving on the same interface. */
 617         if (forw_packet->if_outgoing != if_outgoing)
 618                 return false;
 619
 620         /* check aggregation compatibility
 621          * -> direct link packets are broadcasted on
 622          *    their interface only
 623          * -> aggregate packet if the current packet is
 624          *    a "global" packet as well as the base
 625          *    packet
 626          */
 627         primary_if = batadv_primary_if_get_selected(bat_priv);
 628         if (!primary_if)
 629                 return false;
 630
 631         /* packets without direct link flag and high TTL
 632          * are flooded through the net
 633          */
 634         if (!directlink &&
 635             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
 636             batadv_ogm_packet->ttl != 1 &&
 637
 638             /* own packets originating non-primary
 639              * interfaces leave only that interface
 640              */
 641             (!forw_packet->own ||
 642              forw_packet->if_incoming == primary_if)) {
 643                 res = true;
 644                 goto out;
 645         }
 646
 647         /* if the incoming packet is sent via this one
 648          * interface only - we still can aggregate
 649          */
 650         if (directlink &&
 651             new_bat_ogm_packet->ttl == 1 &&
 652             forw_packet->if_incoming == if_incoming &&
 653
 654             /* packets from direct neighbors or
 655              * own secondary interface packets
 656              * (= secondary interface packets in general)
 657              */
 658             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 659              (forw_packet->own &&
 660               forw_packet->if_incoming != primary_if))) {
 661                 res = true;
 662                 goto out;
 663         }
 664
 665 out:
 666         if (primary_if)
 667                 batadv_hardif_put(primary_if);
 668         return res;
 669 }
 670
 671 /**
 672  * batadv_iv_ogm_aggregate_new() - create a new aggregated packet and add this
 673  *  packet to it.
 674  * @packet_buff: pointer to the OGM
 675  * @packet_len: (total) length of the OGM
 676  * @send_time: timestamp (jiffies) when the packet is to be sent
 677  * @direct_link: whether this OGM has direct link status
 678  * @if_incoming: interface where the packet was received
 679  * @if_outgoing: interface for which the retransmission should be considered
 680  * @own_packet: true if it is a self-generated ogm
 681  */
 682 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 683                                         int packet_len, unsigned long send_time,
 684                                         bool direct_link,
 685                                         struct batadv_hard_iface *if_incoming,
 686                                         struct batadv_hard_iface *if_outgoing,
 687                                         int own_packet)
 688 {
 689         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 690         struct batadv_forw_packet *forw_packet_aggr;
 691         struct sk_buff *skb;
 692         unsigned char *skb_buff;
 693         unsigned int skb_size;
 694         atomic_t *queue_left = own_packet ? NULL : &bat_priv->batman_queue_left;
 695
 696         if (atomic_read(&bat_priv->aggregated_ogms) &&
 697             packet_len < BATADV_MAX_AGGREGATION_BYTES)
 698                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 699         else
 700                 skb_size = packet_len;
 701
 702         skb_size += ETH_HLEN;
 703
 704         skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 705         if (!skb)
 706                 return;
 707
 708         forw_packet_aggr = batadv_forw_packet_alloc(if_incoming, if_outgoing,
 709                                                     queue_left, bat_priv, skb);
 710         if (!forw_packet_aggr) {
 711                 kfree_skb(skb);
 712                 return;
 713         }
 714
 715         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 716         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 717
 718         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 719         forw_packet_aggr->packet_len = packet_len;
 720         memcpy(skb_buff, packet_buff, packet_len);
 721
 722         forw_packet_aggr->own = own_packet;
 723         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 724         forw_packet_aggr->send_time = send_time;
 725
 726         /* save packet direct link flag status */
 727         if (direct_link)
 728                 forw_packet_aggr->direct_link_flags |= 1;
 729
 730         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 731                           batadv_iv_send_outstanding_bat_ogm_packet);
 732
 733         batadv_forw_packet_ogmv1_queue(bat_priv, forw_packet_aggr, send_time);
 734 }
 735
 736 /* aggregate a new packet into the existing ogm packet */
 737 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 738                                     const unsigned char *packet_buff,
 739                                     int packet_len, bool direct_link)
 740 {
 741         unsigned long new_direct_link_flag;
 742
 743         skb_put_data(forw_packet_aggr->skb, packet_buff, packet_len);
 744         forw_packet_aggr->packet_len += packet_len;
 745         forw_packet_aggr->num_packets++;
 746
 747         /* save packet direct link flag status */
 748         if (direct_link) {
 749                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 750                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 751         }
 752 }
 753
 754 /**
 755  * batadv_iv_ogm_queue_add() - queue up an OGM for transmission
 756  * @bat_priv: the bat priv with all the soft interface information
 757  * @packet_buff: pointer to the OGM
 758  * @packet_len: (total) length of the OGM
 759  * @if_incoming: interface where the packet was received
 760  * @if_outgoing: interface for which the retransmission should be considered
 761  * @own_packet: true if it is a self-generated ogm
 762  * @send_time: timestamp (jiffies) when the packet is to be sent
 763  */
 764 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 765                                     unsigned char *packet_buff,
 766                                     int packet_len,
 767                                     struct batadv_hard_iface *if_incoming,
 768                                     struct batadv_hard_iface *if_outgoing,
 769                                     int own_packet, unsigned long send_time)
 770 {
 771         /* _aggr -> pointer to the packet we want to aggregate with
 772          * _pos -> pointer to the position in the queue
 773          */
 774         struct batadv_forw_packet *forw_packet_aggr = NULL;
 775         struct batadv_forw_packet *forw_packet_pos = NULL;
 776         struct batadv_ogm_packet *batadv_ogm_packet;
 777         bool direct_link;
 778         unsigned long max_aggregation_jiffies;
 779
 780         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 781         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 782         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 783
 784         /* find position for the packet in the forward queue */
 785         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 786         /* own packets are not to be aggregated */
 787         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 788                 hlist_for_each_entry(forw_packet_pos,
 789                                      &bat_priv->forw_bat_list, list) {
 790                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 791                                                         bat_priv, packet_len,
 792                                                         send_time, direct_link,
 793                                                         if_incoming,
 794                                                         if_outgoing,
 795                                                         forw_packet_pos)) {
 796                                 forw_packet_aggr = forw_packet_pos;
 797                                 break;
 798                         }
 799                 }
 800         }
 801
 802         /* nothing to aggregate with - either aggregation disabled or no
 803          * suitable aggregation packet found
 804          */
 805         if (!forw_packet_aggr) {
 806                 /* the following section can run without the lock */
 807                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 808
 809                 /* if we could not aggregate this packet with one of the others
 810                  * we hold it back for a while, so that it might be aggregated
 811                  * later on
 812                  */
 813                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 814                         send_time += max_aggregation_jiffies;
 815
 816                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 817                                             send_time, direct_link,
 818                                             if_incoming, if_outgoing,
 819                                             own_packet);
 820         } else {
 821                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 822                                         packet_len, direct_link);
 823                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 824         }
 825 }
 826
 827 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 828                                   const struct ethhdr *ethhdr,
 829                                   struct batadv_ogm_packet *batadv_ogm_packet,
 830                                   bool is_single_hop_neigh,
 831                                   bool is_from_best_next_hop,
 832                                   struct batadv_hard_iface *if_incoming,
 833                                   struct batadv_hard_iface *if_outgoing)
 834 {
 835         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 836         u16 tvlv_len;
 837
 838         if (batadv_ogm_packet->ttl <= 1) {
 839                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 840                 return;
 841         }
 842
 843         if (!is_from_best_next_hop) {
 844                 /* Mark the forwarded packet when it is not coming from our
 845                  * best next hop. We still need to forward the packet for our
 846                  * neighbor link quality detection to work in case the packet
 847                  * originated from a single hop neighbor. Otherwise we can
 848                  * simply drop the ogm.
 849                  */
 850                 if (is_single_hop_neigh)
 851                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 852                 else
 853                         return;
 854         }
 855
 856         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 857
 858         batadv_ogm_packet->ttl--;
 859         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 860
 861         /* apply hop penalty */
 862         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 863                                                    bat_priv);
 864
 865         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 866                    "Forwarding packet: tq: %i, ttl: %i\n",
 867                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 868
 869         if (is_single_hop_neigh)
 870                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 871         else
 872                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 873
 874         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 875                                 BATADV_OGM_HLEN + tvlv_len,
 876                                 if_incoming, if_outgoing, 0,
 877                                 batadv_iv_ogm_fwd_send_time());
 878 }
 879
 880 /**
 881  * batadv_iv_ogm_slide_own_bcast_window() - bitshift own OGM broadcast windows
 882  *  for the given interface
 883  * @hard_iface: the interface for which the windows have to be shifted
 884  */
 885 static void
 886 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 887 {
 888         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 889         struct batadv_hashtable *hash = bat_priv->orig_hash;
 890         struct hlist_head *head;
 891         struct batadv_orig_node *orig_node;
 892         unsigned long *word;
 893         u32 i;
 894         size_t word_index;
 895         u8 *w;
 896         int if_num;
 897
 898         for (i = 0; i < hash->size; i++) {
 899                 head = &hash->table[i];
 900
 901                 rcu_read_lock();
 902                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 903                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 904                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 905                         word = &orig_node->bat_iv.bcast_own[word_index];
 906
 907                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 908                         if_num = hard_iface->if_num;
 909                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 910                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 911                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 912                 }
 913                 rcu_read_unlock();
 914         }
 915 }
 916
 917 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 918 {
 919         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 920         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 921         struct batadv_ogm_packet *batadv_ogm_packet;
 922         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 923         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 924         u32 seqno;
 925         u16 tvlv_len = 0;
 926         unsigned long send_time;
 927
 928         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE ||
 929             hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)
 930                 return;
 931
 932         /* the interface gets activated here to avoid race conditions between
 933          * the moment of activating the interface in
 934          * hardif_activate_interface() where the originator mac is set and
 935          * outdated packets (especially uninitialized mac addresses) in the
 936          * packet queue
 937          */
 938         if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
 939                 hard_iface->if_status = BATADV_IF_ACTIVE;
 940
 941         primary_if = batadv_primary_if_get_selected(bat_priv);
 942
 943         if (hard_iface == primary_if) {
 944                 /* tt changes have to be committed before the tvlv data is
 945                  * appended as it may alter the tt tvlv container
 946                  */
 947                 batadv_tt_local_commit_changes(bat_priv);
 948                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 949                                                             ogm_buff_len,
 950                                                             BATADV_OGM_HLEN);
 951         }
 952
 953         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 954         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 955
 956         /* change sequence number to network order */
 957         seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 958         batadv_ogm_packet->seqno = htonl(seqno);
 959         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 960
 961         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 962
 963         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 964
 965         if (hard_iface != primary_if) {
 966                 /* OGMs from secondary interfaces are only scheduled on their
 967                  * respective interfaces.
 968                  */
 969                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 970                                         hard_iface, hard_iface, 1, send_time);
 971                 goto out;
 972         }
 973
 974         /* OGMs from primary interfaces are scheduled on all
 975          * interfaces.
 976          */
 977         rcu_read_lock();
 978         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 979                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 980                         continue;
 981
 982                 if (!kref_get_unless_zero(&tmp_hard_iface->refcount))
 983                         continue;
 984
 985                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 986                                         *ogm_buff_len, hard_iface,
 987                                         tmp_hard_iface, 1, send_time);
 988
 989                 batadv_hardif_put(tmp_hard_iface);
 990         }
 991         rcu_read_unlock();
 992
 993 out:
 994         if (primary_if)
 995                 batadv_hardif_put(primary_if);
 996 }
 997
 998 /**
 999  * batadv_iv_ogm_orig_update() - use OGM to update corresponding data in an
1000  *  originator
1001  * @bat_priv: the bat priv with all the soft interface information
1002  * @orig_node: the orig node who originally emitted the ogm packet
1003  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
1004  * @ethhdr: Ethernet header of the OGM
1005  * @batadv_ogm_packet: the ogm packet
1006  * @if_incoming: interface where the packet was received
1007  * @if_outgoing: interface for which the retransmission should be considered
1008  * @dup_status: the duplicate status of this ogm packet.
1009  */
1010 static void
1011 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
1012                           struct batadv_orig_node *orig_node,
1013                           struct batadv_orig_ifinfo *orig_ifinfo,
1014                           const struct ethhdr *ethhdr,
1015                           const struct batadv_ogm_packet *batadv_ogm_packet,
1016                           struct batadv_hard_iface *if_incoming,
1017                           struct batadv_hard_iface *if_outgoing,
1018                           enum batadv_dup_status dup_status)
1019 {
1020         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
1021         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1022         struct batadv_neigh_node *neigh_node = NULL;
1023         struct batadv_neigh_node *tmp_neigh_node = NULL;
1024         struct batadv_neigh_node *router = NULL;
1025         struct batadv_orig_node *orig_node_tmp;
1026         int if_num;
1027         u8 sum_orig, sum_neigh;
1028         u8 *neigh_addr;
1029         u8 tq_avg;
1030
1031         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1032                    "%s(): Searching and updating originator entry of received packet\n",
1033                    __func__);
1034
1035         rcu_read_lock();
1036         hlist_for_each_entry_rcu(tmp_neigh_node,
1037                                  &orig_node->neigh_list, list) {
1038                 neigh_addr = tmp_neigh_node->addr;
1039                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1040                     tmp_neigh_node->if_incoming == if_incoming &&
1041                     kref_get_unless_zero(&tmp_neigh_node->refcount)) {
1042                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1043                                 batadv_neigh_node_put(neigh_node);
1044                         neigh_node = tmp_neigh_node;
1045                         continue;
1046                 }
1047
1048                 if (dup_status != BATADV_NO_DUP)
1049                         continue;
1050
1051                 /* only update the entry for this outgoing interface */
1052                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1053                                                        if_outgoing);
1054                 if (!neigh_ifinfo)
1055                         continue;
1056
1057                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1058                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1059                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1060                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1061                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1062                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1063
1064                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1065                 neigh_ifinfo = NULL;
1066         }
1067
1068         if (!neigh_node) {
1069                 struct batadv_orig_node *orig_tmp;
1070
1071                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1072                 if (!orig_tmp)
1073                         goto unlock;
1074
1075                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1076                                                      ethhdr->h_source,
1077                                                      orig_node, orig_tmp);
1078
1079                 batadv_orig_node_put(orig_tmp);
1080                 if (!neigh_node)
1081                         goto unlock;
1082         } else {
1083                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1084                            "Updating existing last-hop neighbor of originator\n");
1085         }
1086
1087         rcu_read_unlock();
1088         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1089         if (!neigh_ifinfo)
1090                 goto out;
1091
1092         neigh_node->last_seen = jiffies;
1093
1094         spin_lock_bh(&neigh_node->ifinfo_lock);
1095         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1096                                &neigh_ifinfo->bat_iv.tq_index,
1097                                batadv_ogm_packet->tq);
1098         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1099         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1100         spin_unlock_bh(&neigh_node->ifinfo_lock);
1101
1102         if (dup_status == BATADV_NO_DUP) {
1103                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1104                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1105         }
1106
1107         /* if this neighbor already is our next hop there is nothing
1108          * to change
1109          */
1110         router = batadv_orig_router_get(orig_node, if_outgoing);
1111         if (router == neigh_node)
1112                 goto out;
1113
1114         if (router) {
1115                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1116                 if (!router_ifinfo)
1117                         goto out;
1118
1119                 /* if this neighbor does not offer a better TQ we won't
1120                  * consider it
1121                  */
1122                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1123                         goto out;
1124         }
1125
1126         /* if the TQ is the same and the link not more symmetric we
1127          * won't consider it either
1128          */
1129         if (router_ifinfo &&
1130             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1131                 orig_node_tmp = router->orig_node;
1132                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1133                 if_num = router->if_incoming->if_num;
1134                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1135                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1136
1137                 orig_node_tmp = neigh_node->orig_node;
1138                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1139                 if_num = neigh_node->if_incoming->if_num;
1140                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1141                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1142
1143                 if (sum_orig >= sum_neigh)
1144                         goto out;
1145         }
1146
1147         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1148         goto out;
1149
1150 unlock:
1151         rcu_read_unlock();
1152 out:
1153         if (neigh_node)
1154                 batadv_neigh_node_put(neigh_node);
1155         if (router)
1156                 batadv_neigh_node_put(router);
1157         if (neigh_ifinfo)
1158                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1159         if (router_ifinfo)
1160                 batadv_neigh_ifinfo_put(router_ifinfo);
1161 }
1162
1163 /**
1164  * batadv_iv_ogm_calc_tq() - calculate tq for current received ogm packet
1165  * @orig_node: the orig node who originally emitted the ogm packet
1166  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1167  * @batadv_ogm_packet: the ogm packet
1168  * @if_incoming: interface where the packet was received
1169  * @if_outgoing: interface for which the retransmission should be considered
1170  *
1171  * Return: true if the link can be considered bidirectional, false otherwise
1172  */
1173 static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1174                                   struct batadv_orig_node *orig_neigh_node,
1175                                   struct batadv_ogm_packet *batadv_ogm_packet,
1176                                   struct batadv_hard_iface *if_incoming,
1177                                   struct batadv_hard_iface *if_outgoing)
1178 {
1179         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1180         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1181         struct batadv_neigh_ifinfo *neigh_ifinfo;
1182         u8 total_count;
1183         u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1184         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1185         int if_num;
1186         unsigned int tq_asym_penalty, inv_asym_penalty;
1187         unsigned int combined_tq;
1188         unsigned int tq_iface_penalty;
1189         bool ret = false;
1190
1191         /* find corresponding one hop neighbor */
1192         rcu_read_lock();
1193         hlist_for_each_entry_rcu(tmp_neigh_node,
1194                                  &orig_neigh_node->neigh_list, list) {
1195                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1196                                         orig_neigh_node->orig))
1197                         continue;
1198
1199                 if (tmp_neigh_node->if_incoming != if_incoming)
1200                         continue;
1201
1202                 if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
1203                         continue;
1204
1205                 neigh_node = tmp_neigh_node;
1206                 break;
1207         }
1208         rcu_read_unlock();
1209
1210         if (!neigh_node)
1211                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1212                                                      orig_neigh_node->orig,
1213                                                      orig_neigh_node,
1214                                                      orig_neigh_node);
1215
1216         if (!neigh_node)
1217                 goto out;
1218
1219         /* if orig_node is direct neighbor update neigh_node last_seen */
1220         if (orig_node == orig_neigh_node)
1221                 neigh_node->last_seen = jiffies;
1222
1223         orig_node->last_seen = jiffies;
1224
1225         /* find packet count of corresponding one hop neighbor */
1226         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1227         if_num = if_incoming->if_num;
1228         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1229         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1230         if (neigh_ifinfo) {
1231                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1232                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1233         } else {
1234                 neigh_rq_count = 0;
1235         }
1236         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1237
1238         /* pay attention to not get a value bigger than 100 % */
1239         if (orig_eq_count > neigh_rq_count)
1240                 total_count = neigh_rq_count;
1241         else
1242                 total_count = orig_eq_count;
1243
1244         /* if we have too few packets (too less data) we set tq_own to zero
1245          * if we receive too few packets it is not considered bidirectional
1246          */
1247         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1248             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1249                 tq_own = 0;
1250         else
1251                 /* neigh_node->real_packet_count is never zero as we
1252                  * only purge old information when getting new
1253                  * information
1254                  */
1255                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1256
1257         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1258          * affect the nearly-symmetric links only a little, but
1259          * punishes asymmetric links more.  This will give a value
1260          * between 0 and TQ_MAX_VALUE
1261          */
1262         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1263         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1264         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1265                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1266                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1267         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1268         inv_asym_penalty /= neigh_rq_max_cube;
1269         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1270
1271         /* penalize if the OGM is forwarded on the same interface. WiFi
1272          * interfaces and other half duplex devices suffer from throughput
1273          * drops as they can't send and receive at the same time.
1274          */
1275         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1276         if (if_outgoing && if_incoming == if_outgoing &&
1277             batadv_is_wifi_hardif(if_outgoing))
1278                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1279                                                       bat_priv);
1280
1281         combined_tq = batadv_ogm_packet->tq *
1282                       tq_own *
1283                       tq_asym_penalty *
1284                       tq_iface_penalty;
1285         combined_tq /= BATADV_TQ_MAX_VALUE *
1286                        BATADV_TQ_MAX_VALUE *
1287                        BATADV_TQ_MAX_VALUE;
1288         batadv_ogm_packet->tq = combined_tq;
1289
1290         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1291                    "bidirectional: orig = %pM neigh = %pM => 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",
1292                    orig_node->orig, orig_neigh_node->orig, total_count,
1293                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1294                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1295                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1296
1297         /* if link has the minimum required transmission quality
1298          * consider it bidirectional
1299          */
1300         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1301                 ret = true;
1302
1303 out:
1304         if (neigh_node)
1305                 batadv_neigh_node_put(neigh_node);
1306         return ret;
1307 }
1308
1309 /**
1310  * batadv_iv_ogm_update_seqnos() -  process a batman packet for all interfaces,
1311  *  adjust the sequence number and find out whether it is a duplicate
1312  * @ethhdr: ethernet header of the packet
1313  * @batadv_ogm_packet: OGM packet to be considered
1314  * @if_incoming: interface on which the OGM packet was received
1315  * @if_outgoing: interface for which the retransmission should be considered
1316  *
1317  * Return: duplicate status as enum batadv_dup_status
1318  */
1319 static enum batadv_dup_status
1320 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1321                             const struct batadv_ogm_packet *batadv_ogm_packet,
1322                             const struct batadv_hard_iface *if_incoming,
1323                             struct batadv_hard_iface *if_outgoing)
1324 {
1325         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1326         struct batadv_orig_node *orig_node;
1327         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1328         struct batadv_neigh_node *neigh_node;
1329         struct batadv_neigh_ifinfo *neigh_ifinfo;
1330         bool is_dup;
1331         s32 seq_diff;
1332         bool need_update = false;
1333         int set_mark;
1334         enum batadv_dup_status ret = BATADV_NO_DUP;
1335         u32 seqno = ntohl(batadv_ogm_packet->seqno);
1336         u8 *neigh_addr;
1337         u8 packet_count;
1338         unsigned long *bitmap;
1339
1340         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1341         if (!orig_node)
1342                 return BATADV_NO_DUP;
1343
1344         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1345         if (WARN_ON(!orig_ifinfo)) {
1346                 batadv_orig_node_put(orig_node);
1347                 return 0;
1348         }
1349
1350         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1351         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1352
1353         /* signalize caller that the packet is to be dropped. */
1354         if (!hlist_empty(&orig_node->neigh_list) &&
1355             batadv_window_protected(bat_priv, seq_diff,
1356                                     BATADV_TQ_LOCAL_WINDOW_SIZE,
1357                                     &orig_ifinfo->batman_seqno_reset, NULL)) {
1358                 ret = BATADV_PROTECTED;
1359                 goto out;
1360         }
1361
1362         rcu_read_lock();
1363         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1364                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1365                                                        if_outgoing);
1366                 if (!neigh_ifinfo)
1367                         continue;
1368
1369                 neigh_addr = neigh_node->addr;
1370                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1371                                          orig_ifinfo->last_real_seqno,
1372                                          seqno);
1373
1374                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1375                     neigh_node->if_incoming == if_incoming) {
1376                         set_mark = 1;
1377                         if (is_dup)
1378                                 ret = BATADV_NEIGH_DUP;
1379                 } else {
1380                         set_mark = 0;
1381                         if (is_dup && ret != BATADV_NEIGH_DUP)
1382                                 ret = BATADV_ORIG_DUP;
1383                 }
1384
1385                 /* if the window moved, set the update flag. */
1386                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1387                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1388                                                      seq_diff, set_mark);
1389
1390                 packet_count = bitmap_weight(bitmap,
1391                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1392                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1393                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1394         }
1395         rcu_read_unlock();
1396
1397         if (need_update) {
1398                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1399                            "%s updating last_seqno: old %u, new %u\n",
1400                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1401                            orig_ifinfo->last_real_seqno, seqno);
1402                 orig_ifinfo->last_real_seqno = seqno;
1403         }
1404
1405 out:
1406         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1407         batadv_orig_node_put(orig_node);
1408         batadv_orig_ifinfo_put(orig_ifinfo);
1409         return ret;
1410 }
1411
1412 /**
1413  * batadv_iv_ogm_process_per_outif() - process a batman iv OGM for an outgoing
1414  *  interface
1415  * @skb: the skb containing the OGM
1416  * @ogm_offset: offset from skb->data to start of ogm header
1417  * @orig_node: the (cached) orig node for the originator of this OGM
1418  * @if_incoming: the interface where this packet was received
1419  * @if_outgoing: the interface for which the packet should be considered
1420  */
1421 static void
1422 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1423                                 struct batadv_orig_node *orig_node,
1424                                 struct batadv_hard_iface *if_incoming,
1425                                 struct batadv_hard_iface *if_outgoing)
1426 {
1427         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1428         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
1429         struct batadv_neigh_node *router = NULL;
1430         struct batadv_neigh_node *router_router = NULL;
1431         struct batadv_orig_node *orig_neigh_node;
1432         struct batadv_orig_ifinfo *orig_ifinfo;
1433         struct batadv_neigh_node *orig_neigh_router = NULL;
1434         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1435         struct batadv_ogm_packet *ogm_packet;
1436         enum batadv_dup_status dup_status;
1437         bool is_from_best_next_hop = false;
1438         bool is_single_hop_neigh = false;
1439         bool sameseq, similar_ttl;
1440         struct sk_buff *skb_priv;
1441         struct ethhdr *ethhdr;
1442         u8 *prev_sender;
1443         bool is_bidirect;
1444
1445         /* create a private copy of the skb, as some functions change tq value
1446          * and/or flags.
1447          */
1448         skb_priv = skb_copy(skb, GFP_ATOMIC);
1449         if (!skb_priv)
1450                 return;
1451
1452         ethhdr = eth_hdr(skb_priv);
1453         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1454
1455         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1456                                                  if_incoming, if_outgoing);
1457         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1458                 is_single_hop_neigh = true;
1459
1460         if (dup_status == BATADV_PROTECTED) {
1461                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1462                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1463                            ethhdr->h_source);
1464                 goto out;
1465         }
1466
1467         if (ogm_packet->tq == 0) {
1468                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1469                            "Drop packet: originator packet with tq equal 0\n");
1470                 goto out;
1471         }
1472
1473         if (is_single_hop_neigh) {
1474                 hardif_neigh = batadv_hardif_neigh_get(if_incoming,
1475                                                        ethhdr->h_source);
1476                 if (hardif_neigh)
1477                         hardif_neigh->last_seen = jiffies;
1478         }
1479
1480         router = batadv_orig_router_get(orig_node, if_outgoing);
1481         if (router) {
1482                 router_router = batadv_orig_router_get(router->orig_node,
1483                                                        if_outgoing);
1484                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1485         }
1486
1487         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1488             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1489                 is_from_best_next_hop = true;
1490
1491         prev_sender = ogm_packet->prev_sender;
1492         /* avoid temporary routing loops */
1493         if (router && router_router &&
1494             (batadv_compare_eth(router->addr, prev_sender)) &&
1495             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1496             (batadv_compare_eth(router->addr, router_router->addr))) {
1497                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1498                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1499                            ethhdr->h_source);
1500                 goto out;
1501         }
1502
1503         if (if_outgoing == BATADV_IF_DEFAULT)
1504                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1505
1506         /* if sender is a direct neighbor the sender mac equals
1507          * originator mac
1508          */
1509         if (is_single_hop_neigh)
1510                 orig_neigh_node = orig_node;
1511         else
1512                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1513                                                          ethhdr->h_source);
1514
1515         if (!orig_neigh_node)
1516                 goto out;
1517
1518         /* Update nc_nodes of the originator */
1519         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1520                                  ogm_packet, is_single_hop_neigh);
1521
1522         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1523                                                    if_outgoing);
1524
1525         /* drop packet if sender is not a direct neighbor and if we
1526          * don't route towards it
1527          */
1528         if (!is_single_hop_neigh && !orig_neigh_router) {
1529                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1530                            "Drop packet: OGM via unknown neighbor!\n");
1531                 goto out_neigh;
1532         }
1533
1534         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1535                                             ogm_packet, if_incoming,
1536                                             if_outgoing);
1537
1538         /* update ranking if it is not a duplicate or has the same
1539          * seqno and similar ttl as the non-duplicate
1540          */
1541         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1542         if (!orig_ifinfo)
1543                 goto out_neigh;
1544
1545         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1546         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1547
1548         if (is_bidirect && (dup_status == BATADV_NO_DUP ||
1549                             (sameseq && similar_ttl))) {
1550                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1551                                           orig_ifinfo, ethhdr,
1552                                           ogm_packet, if_incoming,
1553                                           if_outgoing, dup_status);
1554         }
1555         batadv_orig_ifinfo_put(orig_ifinfo);
1556
1557         /* only forward for specific interface, not for the default one. */
1558         if (if_outgoing == BATADV_IF_DEFAULT)
1559                 goto out_neigh;
1560
1561         /* is single hop (direct) neighbor */
1562         if (is_single_hop_neigh) {
1563                 /* OGMs from secondary interfaces should only scheduled once
1564                  * per interface where it has been received, not multiple times
1565                  */
1566                 if (ogm_packet->ttl <= 2 &&
1567                     if_incoming != if_outgoing) {
1568                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1569                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1570                         goto out_neigh;
1571                 }
1572                 /* mark direct link on incoming interface */
1573                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1574                                       is_single_hop_neigh,
1575                                       is_from_best_next_hop, if_incoming,
1576                                       if_outgoing);
1577
1578                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1579                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1580                 goto out_neigh;
1581         }
1582
1583         /* multihop originator */
1584         if (!is_bidirect) {
1585                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1586                            "Drop packet: not received via bidirectional link\n");
1587                 goto out_neigh;
1588         }
1589
1590         if (dup_status == BATADV_NEIGH_DUP) {
1591                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1592                            "Drop packet: duplicate packet received\n");
1593                 goto out_neigh;
1594         }
1595
1596         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1597                    "Forwarding packet: rebroadcast originator packet\n");
1598         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1599                               is_single_hop_neigh, is_from_best_next_hop,
1600                               if_incoming, if_outgoing);
1601
1602 out_neigh:
1603         if (orig_neigh_node && !is_single_hop_neigh)
1604                 batadv_orig_node_put(orig_neigh_node);
1605 out:
1606         if (router_ifinfo)
1607                 batadv_neigh_ifinfo_put(router_ifinfo);
1608         if (router)
1609                 batadv_neigh_node_put(router);
1610         if (router_router)
1611                 batadv_neigh_node_put(router_router);
1612         if (orig_neigh_router)
1613                 batadv_neigh_node_put(orig_neigh_router);
1614         if (hardif_neigh)
1615                 batadv_hardif_neigh_put(hardif_neigh);
1616
1617         consume_skb(skb_priv);
1618 }
1619
1620 /**
1621  * batadv_iv_ogm_process() - process an incoming batman iv OGM
1622  * @skb: the skb containing the OGM
1623  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1624  * @if_incoming: the interface where this packet was receved
1625  */
1626 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1627                                   struct batadv_hard_iface *if_incoming)
1628 {
1629         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1630         struct batadv_orig_node *orig_neigh_node, *orig_node;
1631         struct batadv_hard_iface *hard_iface;
1632         struct batadv_ogm_packet *ogm_packet;
1633         u32 if_incoming_seqno;
1634         bool has_directlink_flag;
1635         struct ethhdr *ethhdr;
1636         bool is_my_oldorig = false;
1637         bool is_my_addr = false;
1638         bool is_my_orig = false;
1639
1640         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1641         ethhdr = eth_hdr(skb);
1642
1643         /* Silently drop when the batman packet is actually not a
1644          * correct packet.
1645          *
1646          * This might happen if a packet is padded (e.g. Ethernet has a
1647          * minimum frame length of 64 byte) and the aggregation interprets
1648          * it as an additional length.
1649          *
1650          * TODO: A more sane solution would be to have a bit in the
1651          * batadv_ogm_packet to detect whether the packet is the last
1652          * packet in an aggregation.  Here we expect that the padding
1653          * is always zero (or not 0x01)
1654          */
1655         if (ogm_packet->packet_type != BATADV_IV_OGM)
1656                 return;
1657
1658         /* could be changed by schedule_own_packet() */
1659         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1660
1661         if (ogm_packet->flags & BATADV_DIRECTLINK)
1662                 has_directlink_flag = true;
1663         else
1664                 has_directlink_flag = false;
1665
1666         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1667                    "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",
1668                    ethhdr->h_source, if_incoming->net_dev->name,
1669                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1670                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1671                    ogm_packet->tq, ogm_packet->ttl,
1672                    ogm_packet->version, has_directlink_flag);
1673
1674         rcu_read_lock();
1675         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1676                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1677                         continue;
1678
1679                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1680                         continue;
1681
1682                 if (batadv_compare_eth(ethhdr->h_source,
1683                                        hard_iface->net_dev->dev_addr))
1684                         is_my_addr = true;
1685
1686                 if (batadv_compare_eth(ogm_packet->orig,
1687                                        hard_iface->net_dev->dev_addr))
1688                         is_my_orig = true;
1689
1690                 if (batadv_compare_eth(ogm_packet->prev_sender,
1691                                        hard_iface->net_dev->dev_addr))
1692                         is_my_oldorig = true;
1693         }
1694         rcu_read_unlock();
1695
1696         if (is_my_addr) {
1697                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1698                            "Drop packet: received my own broadcast (sender: %pM)\n",
1699                            ethhdr->h_source);
1700                 return;
1701         }
1702
1703         if (is_my_orig) {
1704                 unsigned long *word;
1705                 int offset;
1706                 s32 bit_pos;
1707                 s16 if_num;
1708                 u8 *weight;
1709
1710                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1711                                                          ethhdr->h_source);
1712                 if (!orig_neigh_node)
1713                         return;
1714
1715                 /* neighbor has to indicate direct link and it has to
1716                  * come via the corresponding interface
1717                  * save packet seqno for bidirectional check
1718                  */
1719                 if (has_directlink_flag &&
1720                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1721                                        ogm_packet->orig)) {
1722                         if_num = if_incoming->if_num;
1723                         offset = if_num * BATADV_NUM_WORDS;
1724
1725                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1726                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1727                         bit_pos = if_incoming_seqno - 2;
1728                         bit_pos -= ntohl(ogm_packet->seqno);
1729                         batadv_set_bit(word, bit_pos);
1730                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1731                         *weight = bitmap_weight(word,
1732                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1733                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1734                 }
1735
1736                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1737                            "Drop packet: originator packet from myself (via neighbor)\n");
1738                 batadv_orig_node_put(orig_neigh_node);
1739                 return;
1740         }
1741
1742         if (is_my_oldorig) {
1743                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1744                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1745                            ethhdr->h_source);
1746                 return;
1747         }
1748
1749         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1750                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1751                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1752                            ethhdr->h_source);
1753                 return;
1754         }
1755
1756         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1757         if (!orig_node)
1758                 return;
1759
1760         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1761                                         if_incoming, BATADV_IF_DEFAULT);
1762
1763         rcu_read_lock();
1764         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1765                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1766                         continue;
1767
1768                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1769                         continue;
1770
1771                 if (!kref_get_unless_zero(&hard_iface->refcount))
1772                         continue;
1773
1774                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1775                                                 if_incoming, hard_iface);
1776
1777                 batadv_hardif_put(hard_iface);
1778         }
1779         rcu_read_unlock();
1780
1781         batadv_orig_node_put(orig_node);
1782 }
1783
1784 static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work)
1785 {
1786         struct delayed_work *delayed_work;
1787         struct batadv_forw_packet *forw_packet;
1788         struct batadv_priv *bat_priv;
1789         bool dropped = false;
1790
1791         delayed_work = to_delayed_work(work);
1792         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
1793                                    delayed_work);
1794         bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
1795
1796         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) {
1797                 dropped = true;
1798                 goto out;
1799         }
1800
1801         batadv_iv_ogm_emit(forw_packet);
1802
1803         /* we have to have at least one packet in the queue to determine the
1804          * queues wake up time unless we are shutting down.
1805          *
1806          * only re-schedule if this is the "original" copy, e.g. the OGM of the
1807          * primary interface should only be rescheduled once per period, but
1808          * this function will be called for the forw_packet instances of the
1809          * other secondary interfaces as well.
1810          */
1811         if (forw_packet->own &&
1812             forw_packet->if_incoming == forw_packet->if_outgoing)
1813                 batadv_iv_ogm_schedule(forw_packet->if_incoming);
1814
1815 out:
1816         /* do we get something for free()? */
1817         if (batadv_forw_packet_steal(forw_packet,
1818                                      &bat_priv->forw_bat_list_lock))
1819                 batadv_forw_packet_free(forw_packet, dropped);
1820 }
1821
1822 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1823                                  struct batadv_hard_iface *if_incoming)
1824 {
1825         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1826         struct batadv_ogm_packet *ogm_packet;
1827         u8 *packet_pos;
1828         int ogm_offset;
1829         bool res;
1830         int ret = NET_RX_DROP;
1831
1832         res = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1833         if (!res)
1834                 goto free_skb;
1835
1836         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1837          * that does not have B.A.T.M.A.N. IV enabled ?
1838          */
1839         if (bat_priv->algo_ops->iface.enable != batadv_iv_ogm_iface_enable)
1840                 goto free_skb;
1841
1842         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1843         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1844                            skb->len + ETH_HLEN);
1845
1846         ogm_offset = 0;
1847         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1848
1849         /* unpack the aggregated packets and process them one by one */
1850         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1851                                          ogm_packet->tvlv_len)) {
1852                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1853
1854                 ogm_offset += BATADV_OGM_HLEN;
1855                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1856
1857                 packet_pos = skb->data + ogm_offset;
1858                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1859         }
1860
1861         ret = NET_RX_SUCCESS;
1862
1863 free_skb:
1864         if (ret == NET_RX_SUCCESS)
1865                 consume_skb(skb);
1866         else
1867                 kfree_skb(skb);
1868
1869         return ret;
1870 }
1871
1872 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1873 /**
1874  * batadv_iv_ogm_orig_print_neigh() - print neighbors for the originator table
1875  * @orig_node: the orig_node for which the neighbors are printed
1876  * @if_outgoing: outgoing interface for these entries
1877  * @seq: debugfs table seq_file struct
1878  *
1879  * Must be called while holding an rcu lock.
1880  */
1881 static void
1882 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1883                                struct batadv_hard_iface *if_outgoing,
1884                                struct seq_file *seq)
1885 {
1886         struct batadv_neigh_node *neigh_node;
1887         struct batadv_neigh_ifinfo *n_ifinfo;
1888
1889         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1890                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1891                 if (!n_ifinfo)
1892                         continue;
1893
1894                 seq_printf(seq, " %pM (%3i)",
1895                            neigh_node->addr,
1896                            n_ifinfo->bat_iv.tq_avg);
1897
1898                 batadv_neigh_ifinfo_put(n_ifinfo);
1899         }
1900 }
1901
1902 /**
1903  * batadv_iv_ogm_orig_print() - print the originator table
1904  * @bat_priv: the bat priv with all the soft interface information
1905  * @seq: debugfs table seq_file struct
1906  * @if_outgoing: the outgoing interface for which this should be printed
1907  */
1908 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1909                                      struct seq_file *seq,
1910                                      struct batadv_hard_iface *if_outgoing)
1911 {
1912         struct batadv_neigh_node *neigh_node;
1913         struct batadv_hashtable *hash = bat_priv->orig_hash;
1914         int last_seen_msecs, last_seen_secs;
1915         struct batadv_orig_node *orig_node;
1916         struct batadv_neigh_ifinfo *n_ifinfo;
1917         unsigned long last_seen_jiffies;
1918         struct hlist_head *head;
1919         int batman_count = 0;
1920         u32 i;
1921
1922         seq_puts(seq,
1923                  "  Originator      last-seen (#/255)           Nexthop [outgoingIF]:   Potential nexthops ...\n");
1924
1925         for (i = 0; i < hash->size; i++) {
1926                 head = &hash->table[i];
1927
1928                 rcu_read_lock();
1929                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1930                         neigh_node = batadv_orig_router_get(orig_node,
1931                                                             if_outgoing);
1932                         if (!neigh_node)
1933                                 continue;
1934
1935                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1936                                                            if_outgoing);
1937                         if (!n_ifinfo)
1938                                 goto next;
1939
1940                         if (n_ifinfo->bat_iv.tq_avg == 0)
1941                                 goto next;
1942
1943                         last_seen_jiffies = jiffies - orig_node->last_seen;
1944                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1945                         last_seen_secs = last_seen_msecs / 1000;
1946                         last_seen_msecs = last_seen_msecs % 1000;
1947
1948                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1949                                    orig_node->orig, last_seen_secs,
1950                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1951                                    neigh_node->addr,
1952                                    neigh_node->if_incoming->net_dev->name);
1953
1954                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1955                                                        seq);
1956                         seq_putc(seq, '\n');
1957                         batman_count++;
1958
1959 next:
1960                         batadv_neigh_node_put(neigh_node);
1961                         if (n_ifinfo)
1962                                 batadv_neigh_ifinfo_put(n_ifinfo);
1963                 }
1964                 rcu_read_unlock();
1965         }
1966
1967         if (batman_count == 0)
1968                 seq_puts(seq, "No batman nodes in range ...\n");
1969 }
1970 #endif
1971
1972 /**
1973  * batadv_iv_ogm_neigh_get_tq_avg() - Get the TQ average for a neighbour on a
1974  *  given outgoing interface.
1975  * @neigh_node: Neighbour of interest
1976  * @if_outgoing: Outgoing interface of interest
1977  * @tq_avg: Pointer of where to store the TQ average
1978  *
1979  * Return: False if no average TQ available, otherwise true.
1980  */
1981 static bool
1982 batadv_iv_ogm_neigh_get_tq_avg(struct batadv_neigh_node *neigh_node,
1983                                struct batadv_hard_iface *if_outgoing,
1984                                u8 *tq_avg)
1985 {
1986         struct batadv_neigh_ifinfo *n_ifinfo;
1987
1988         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1989         if (!n_ifinfo)
1990                 return false;
1991
1992         *tq_avg = n_ifinfo->bat_iv.tq_avg;
1993         batadv_neigh_ifinfo_put(n_ifinfo);
1994
1995         return true;
1996 }
1997
1998 /**
1999  * batadv_iv_ogm_orig_dump_subentry() - Dump an originator subentry into a
2000  *  message
2001  * @msg: Netlink message to dump into
2002  * @portid: Port making netlink request
2003  * @seq: Sequence number of netlink message
2004  * @bat_priv: The bat priv with all the soft interface information
2005  * @if_outgoing: Limit dump to entries with this outgoing interface
2006  * @orig_node: Originator to dump
2007  * @neigh_node: Single hops neighbour
2008  * @best: Is the best originator
2009  *
2010  * Return: Error code, or 0 on success
2011  */
2012 static int
2013 batadv_iv_ogm_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
2014                                  struct batadv_priv *bat_priv,
2015                                  struct batadv_hard_iface *if_outgoing,
2016                                  struct batadv_orig_node *orig_node,
2017                                  struct batadv_neigh_node *neigh_node,
2018                                  bool best)
2019 {
2020         void *hdr;
2021         u8 tq_avg;
2022         unsigned int last_seen_msecs;
2023
2024         last_seen_msecs = jiffies_to_msecs(jiffies - orig_node->last_seen);
2025
2026         if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node, if_outgoing, &tq_avg))
2027                 return 0;
2028
2029         if (if_outgoing != BATADV_IF_DEFAULT &&
2030             if_outgoing != neigh_node->if_incoming)
2031                 return 0;
2032
2033         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2034                           NLM_F_MULTI, BATADV_CMD_GET_ORIGINATORS);
2035         if (!hdr)
2036                 return -ENOBUFS;
2037
2038         if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2039                     orig_node->orig) ||
2040             nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
2041                     neigh_node->addr) ||
2042             nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
2043                         neigh_node->if_incoming->net_dev->ifindex) ||
2044             nla_put_u8(msg, BATADV_ATTR_TQ, tq_avg) ||
2045             nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
2046                         last_seen_msecs))
2047                 goto nla_put_failure;
2048
2049         if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
2050                 goto nla_put_failure;
2051
2052         genlmsg_end(msg, hdr);
2053         return 0;
2054
2055  nla_put_failure:
2056         genlmsg_cancel(msg, hdr);
2057         return -EMSGSIZE;
2058 }
2059
2060 /**
2061  * batadv_iv_ogm_orig_dump_entry() - Dump an originator entry into a message
2062  * @msg: Netlink message to dump into
2063  * @portid: Port making netlink request
2064  * @seq: Sequence number of netlink message
2065  * @bat_priv: The bat priv with all the soft interface information
2066  * @if_outgoing: Limit dump to entries with this outgoing interface
2067  * @orig_node: Originator to dump
2068  * @sub_s: Number of sub entries to skip
2069  *
2070  * This function assumes the caller holds rcu_read_lock().
2071  *
2072  * Return: Error code, or 0 on success
2073  */
2074 static int
2075 batadv_iv_ogm_orig_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2076                               struct batadv_priv *bat_priv,
2077                               struct batadv_hard_iface *if_outgoing,
2078                               struct batadv_orig_node *orig_node, int *sub_s)
2079 {
2080         struct batadv_neigh_node *neigh_node_best;
2081         struct batadv_neigh_node *neigh_node;
2082         int sub = 0;
2083         bool best;
2084         u8 tq_avg_best;
2085
2086         neigh_node_best = batadv_orig_router_get(orig_node, if_outgoing);
2087         if (!neigh_node_best)
2088                 goto out;
2089
2090         if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node_best, if_outgoing,
2091                                             &tq_avg_best))
2092                 goto out;
2093
2094         if (tq_avg_best == 0)
2095                 goto out;
2096
2097         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
2098                 if (sub++ < *sub_s)
2099                         continue;
2100
2101                 best = (neigh_node == neigh_node_best);
2102
2103                 if (batadv_iv_ogm_orig_dump_subentry(msg, portid, seq,
2104                                                      bat_priv, if_outgoing,
2105                                                      orig_node, neigh_node,
2106                                                      best)) {
2107                         batadv_neigh_node_put(neigh_node_best);
2108
2109                         *sub_s = sub - 1;
2110                         return -EMSGSIZE;
2111                 }
2112         }
2113
2114  out:
2115         if (neigh_node_best)
2116                 batadv_neigh_node_put(neigh_node_best);
2117
2118         *sub_s = 0;
2119         return 0;
2120 }
2121
2122 /**
2123  * batadv_iv_ogm_orig_dump_bucket() - Dump an originator bucket into a
2124  *  message
2125  * @msg: Netlink message to dump into
2126  * @portid: Port making netlink request
2127  * @seq: Sequence number of netlink message
2128  * @bat_priv: The bat priv with all the soft interface information
2129  * @if_outgoing: Limit dump to entries with this outgoing interface
2130  * @head: Bucket to be dumped
2131  * @idx_s: Number of entries to be skipped
2132  * @sub: Number of sub entries to be skipped
2133  *
2134  * Return: Error code, or 0 on success
2135  */
2136 static int
2137 batadv_iv_ogm_orig_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2138                                struct batadv_priv *bat_priv,
2139                                struct batadv_hard_iface *if_outgoing,
2140                                struct hlist_head *head, int *idx_s, int *sub)
2141 {
2142         struct batadv_orig_node *orig_node;
2143         int idx = 0;
2144
2145         rcu_read_lock();
2146         hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
2147                 if (idx++ < *idx_s)
2148                         continue;
2149
2150                 if (batadv_iv_ogm_orig_dump_entry(msg, portid, seq, bat_priv,
2151                                                   if_outgoing, orig_node,
2152                                                   sub)) {
2153                         rcu_read_unlock();
2154                         *idx_s = idx - 1;
2155                         return -EMSGSIZE;
2156                 }
2157         }
2158         rcu_read_unlock();
2159
2160         *idx_s = 0;
2161         *sub = 0;
2162         return 0;
2163 }
2164
2165 /**
2166  * batadv_iv_ogm_orig_dump() - Dump the originators into a message
2167  * @msg: Netlink message to dump into
2168  * @cb: Control block containing additional options
2169  * @bat_priv: The bat priv with all the soft interface information
2170  * @if_outgoing: Limit dump to entries with this outgoing interface
2171  */
2172 static void
2173 batadv_iv_ogm_orig_dump(struct sk_buff *msg, struct netlink_callback *cb,
2174                         struct batadv_priv *bat_priv,
2175                         struct batadv_hard_iface *if_outgoing)
2176 {
2177         struct batadv_hashtable *hash = bat_priv->orig_hash;
2178         struct hlist_head *head;
2179         int bucket = cb->args[0];
2180         int idx = cb->args[1];
2181         int sub = cb->args[2];
2182         int portid = NETLINK_CB(cb->skb).portid;
2183
2184         while (bucket < hash->size) {
2185                 head = &hash->table[bucket];
2186
2187                 if (batadv_iv_ogm_orig_dump_bucket(msg, portid,
2188                                                    cb->nlh->nlmsg_seq,
2189                                                    bat_priv, if_outgoing, head,
2190                                                    &idx, &sub))
2191                         break;
2192
2193                 bucket++;
2194         }
2195
2196         cb->args[0] = bucket;
2197         cb->args[1] = idx;
2198         cb->args[2] = sub;
2199 }
2200
2201 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2202 /**
2203  * batadv_iv_hardif_neigh_print() - print a single hop neighbour node
2204  * @seq: neighbour table seq_file struct
2205  * @hardif_neigh: hardif neighbour information
2206  */
2207 static void
2208 batadv_iv_hardif_neigh_print(struct seq_file *seq,
2209                              struct batadv_hardif_neigh_node *hardif_neigh)
2210 {
2211         int last_secs, last_msecs;
2212
2213         last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
2214         last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
2215
2216         seq_printf(seq, "   %10s   %pM %4i.%03is\n",
2217                    hardif_neigh->if_incoming->net_dev->name,
2218                    hardif_neigh->addr, last_secs, last_msecs);
2219 }
2220
2221 /**
2222  * batadv_iv_ogm_neigh_print() - print the single hop neighbour list
2223  * @bat_priv: the bat priv with all the soft interface information
2224  * @seq: neighbour table seq_file struct
2225  */
2226 static void batadv_iv_neigh_print(struct batadv_priv *bat_priv,
2227                                   struct seq_file *seq)
2228 {
2229         struct net_device *net_dev = (struct net_device *)seq->private;
2230         struct batadv_hardif_neigh_node *hardif_neigh;
2231         struct batadv_hard_iface *hard_iface;
2232         int batman_count = 0;
2233
2234         seq_puts(seq, "           IF        Neighbor      last-seen\n");
2235
2236         rcu_read_lock();
2237         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
2238                 if (hard_iface->soft_iface != net_dev)
2239                         continue;
2240
2241                 hlist_for_each_entry_rcu(hardif_neigh,
2242                                          &hard_iface->neigh_list, list) {
2243                         batadv_iv_hardif_neigh_print(seq, hardif_neigh);
2244                         batman_count++;
2245                 }
2246         }
2247         rcu_read_unlock();
2248
2249         if (batman_count == 0)
2250                 seq_puts(seq, "No batman nodes in range ...\n");
2251 }
2252 #endif
2253
2254 /**
2255  * batadv_iv_ogm_neigh_diff() - calculate tq difference of two neighbors
2256  * @neigh1: the first neighbor object of the comparison
2257  * @if_outgoing1: outgoing interface for the first neighbor
2258  * @neigh2: the second neighbor object of the comparison
2259  * @if_outgoing2: outgoing interface for the second neighbor
2260  * @diff: pointer to integer receiving the calculated difference
2261  *
2262  * The content of *@diff is only valid when this function returns true.
2263  * It is less, equal to or greater than 0 if the metric via neigh1 is lower,
2264  * the same as or higher than the metric via neigh2
2265  *
2266  * Return: true when the difference could be calculated, false otherwise
2267  */
2268 static bool batadv_iv_ogm_neigh_diff(struct batadv_neigh_node *neigh1,
2269                                      struct batadv_hard_iface *if_outgoing1,
2270                                      struct batadv_neigh_node *neigh2,
2271                                      struct batadv_hard_iface *if_outgoing2,
2272                                      int *diff)
2273 {
2274         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
2275         u8 tq1, tq2;
2276         bool ret = true;
2277
2278         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
2279         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
2280
2281         if (!neigh1_ifinfo || !neigh2_ifinfo) {
2282                 ret = false;
2283                 goto out;
2284         }
2285
2286         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2287         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2288         *diff = (int)tq1 - (int)tq2;
2289
2290 out:
2291         if (neigh1_ifinfo)
2292                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
2293         if (neigh2_ifinfo)
2294                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
2295
2296         return ret;
2297 }
2298
2299 /**
2300  * batadv_iv_ogm_neigh_dump_neigh() - Dump a neighbour into a netlink message
2301  * @msg: Netlink message to dump into
2302  * @portid: Port making netlink request
2303  * @seq: Sequence number of netlink message
2304  * @hardif_neigh: Neighbour to be dumped
2305  *
2306  * Return: Error code, or 0 on success
2307  */
2308 static int
2309 batadv_iv_ogm_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq,
2310                                struct batadv_hardif_neigh_node *hardif_neigh)
2311 {
2312         void *hdr;
2313         unsigned int last_seen_msecs;
2314
2315         last_seen_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen);
2316
2317         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2318                           NLM_F_MULTI, BATADV_CMD_GET_NEIGHBORS);
2319         if (!hdr)
2320                 return -ENOBUFS;
2321
2322         if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
2323                     hardif_neigh->addr) ||
2324             nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
2325                         hardif_neigh->if_incoming->net_dev->ifindex) ||
2326             nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
2327                         last_seen_msecs))
2328                 goto nla_put_failure;
2329
2330         genlmsg_end(msg, hdr);
2331         return 0;
2332
2333  nla_put_failure:
2334         genlmsg_cancel(msg, hdr);
2335         return -EMSGSIZE;
2336 }
2337
2338 /**
2339  * batadv_iv_ogm_neigh_dump_hardif() - Dump the neighbours of a hard interface
2340  *  into a message
2341  * @msg: Netlink message to dump into
2342  * @portid: Port making netlink request
2343  * @seq: Sequence number of netlink message
2344  * @bat_priv: The bat priv with all the soft interface information
2345  * @hard_iface: Hard interface to dump the neighbours for
2346  * @idx_s: Number of entries to skip
2347  *
2348  * This function assumes the caller holds rcu_read_lock().
2349  *
2350  * Return: Error code, or 0 on success
2351  */
2352 static int
2353 batadv_iv_ogm_neigh_dump_hardif(struct sk_buff *msg, u32 portid, u32 seq,
2354                                 struct batadv_priv *bat_priv,
2355                                 struct batadv_hard_iface *hard_iface,
2356                                 int *idx_s)
2357 {
2358         struct batadv_hardif_neigh_node *hardif_neigh;
2359         int idx = 0;
2360
2361         hlist_for_each_entry_rcu(hardif_neigh,
2362                                  &hard_iface->neigh_list, list) {
2363                 if (idx++ < *idx_s)
2364                         continue;
2365
2366                 if (batadv_iv_ogm_neigh_dump_neigh(msg, portid, seq,
2367                                                    hardif_neigh)) {
2368                         *idx_s = idx - 1;
2369                         return -EMSGSIZE;
2370                 }
2371         }
2372
2373         *idx_s = 0;
2374         return 0;
2375 }
2376
2377 /**
2378  * batadv_iv_ogm_neigh_dump() - Dump the neighbours into a message
2379  * @msg: Netlink message to dump into
2380  * @cb: Control block containing additional options
2381  * @bat_priv: The bat priv with all the soft interface information
2382  * @single_hardif: Limit dump to this hard interfaace
2383  */
2384 static void
2385 batadv_iv_ogm_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb,
2386                          struct batadv_priv *bat_priv,
2387                          struct batadv_hard_iface *single_hardif)
2388 {
2389         struct batadv_hard_iface *hard_iface;
2390         int i_hardif = 0;
2391         int i_hardif_s = cb->args[0];
2392         int idx = cb->args[1];
2393         int portid = NETLINK_CB(cb->skb).portid;
2394
2395         rcu_read_lock();
2396         if (single_hardif) {
2397                 if (i_hardif_s == 0) {
2398                         if (batadv_iv_ogm_neigh_dump_hardif(msg, portid,
2399                                                             cb->nlh->nlmsg_seq,
2400                                                             bat_priv,
2401                                                             single_hardif,
2402                                                             &idx) == 0)
2403                                 i_hardif++;
2404                 }
2405         } else {
2406                 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list,
2407                                         list) {
2408                         if (hard_iface->soft_iface != bat_priv->soft_iface)
2409                                 continue;
2410
2411                         if (i_hardif++ < i_hardif_s)
2412                                 continue;
2413
2414                         if (batadv_iv_ogm_neigh_dump_hardif(msg, portid,
2415                                                             cb->nlh->nlmsg_seq,
2416                                                             bat_priv,
2417                                                             hard_iface, &idx)) {
2418                                 i_hardif--;
2419                                 break;
2420                         }
2421                 }
2422         }
2423         rcu_read_unlock();
2424
2425         cb->args[0] = i_hardif;
2426         cb->args[1] = idx;
2427 }
2428
2429 /**
2430  * batadv_iv_ogm_neigh_cmp() - compare the metrics of two neighbors
2431  * @neigh1: the first neighbor object of the comparison
2432  * @if_outgoing1: outgoing interface for the first neighbor
2433  * @neigh2: the second neighbor object of the comparison
2434  * @if_outgoing2: outgoing interface for the second neighbor
2435  *
2436  * Return: a value less, equal to or greater than 0 if the metric via neigh1 is
2437  * lower, the same as or higher than the metric via neigh2
2438  */
2439 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
2440                                    struct batadv_hard_iface *if_outgoing1,
2441                                    struct batadv_neigh_node *neigh2,
2442                                    struct batadv_hard_iface *if_outgoing2)
2443 {
2444         bool ret;
2445         int diff;
2446
2447         ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2,
2448                                        if_outgoing2, &diff);
2449         if (!ret)
2450                 return 0;
2451
2452         return diff;
2453 }
2454
2455 /**
2456  * batadv_iv_ogm_neigh_is_sob() - check if neigh1 is similarly good or better
2457  *  than neigh2 from the metric prospective
2458  * @neigh1: the first neighbor object of the comparison
2459  * @if_outgoing1: outgoing interface for the first neighbor
2460  * @neigh2: the second neighbor object of the comparison
2461  * @if_outgoing2: outgoing interface for the second neighbor
2462  *
2463  * Return: true if the metric via neigh1 is equally good or better than
2464  * the metric via neigh2, false otherwise.
2465  */
2466 static bool
2467 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1,
2468                            struct batadv_hard_iface *if_outgoing1,
2469                            struct batadv_neigh_node *neigh2,
2470                            struct batadv_hard_iface *if_outgoing2)
2471 {
2472         bool ret;
2473         int diff;
2474
2475         ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2,
2476                                        if_outgoing2, &diff);
2477         if (!ret)
2478                 return false;
2479
2480         ret = diff > -BATADV_TQ_SIMILARITY_THRESHOLD;
2481         return ret;
2482 }
2483
2484 static void batadv_iv_iface_activate(struct batadv_hard_iface *hard_iface)
2485 {
2486         /* begin scheduling originator messages on that interface */
2487         batadv_iv_ogm_schedule(hard_iface);
2488 }
2489
2490 /**
2491  * batadv_iv_init_sel_class() - initialize GW selection class
2492  * @bat_priv: the bat priv with all the soft interface information
2493  */
2494 static void batadv_iv_init_sel_class(struct batadv_priv *bat_priv)
2495 {
2496         /* set default TQ difference threshold to 20 */
2497         atomic_set(&bat_priv->gw.sel_class, 20);
2498 }
2499
2500 static struct batadv_gw_node *
2501 batadv_iv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
2502 {
2503         struct batadv_neigh_node *router;
2504         struct batadv_neigh_ifinfo *router_ifinfo;
2505         struct batadv_gw_node *gw_node, *curr_gw = NULL;
2506         u64 max_gw_factor = 0;
2507         u64 tmp_gw_factor = 0;
2508         u8 max_tq = 0;
2509         u8 tq_avg;
2510         struct batadv_orig_node *orig_node;
2511
2512         rcu_read_lock();
2513         hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) {
2514                 orig_node = gw_node->orig_node;
2515                 router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
2516                 if (!router)
2517                         continue;
2518
2519                 router_ifinfo = batadv_neigh_ifinfo_get(router,
2520                                                         BATADV_IF_DEFAULT);
2521                 if (!router_ifinfo)
2522                         goto next;
2523
2524                 if (!kref_get_unless_zero(&gw_node->refcount))
2525                         goto next;
2526
2527                 tq_avg = router_ifinfo->bat_iv.tq_avg;
2528
2529                 switch (atomic_read(&bat_priv->gw.sel_class)) {
2530                 case 1: /* fast connection */
2531                         tmp_gw_factor = tq_avg * tq_avg;
2532                         tmp_gw_factor *= gw_node->bandwidth_down;
2533                         tmp_gw_factor *= 100 * 100;
2534                         tmp_gw_factor >>= 18;
2535
2536                         if (tmp_gw_factor > max_gw_factor ||
2537                             (tmp_gw_factor == max_gw_factor &&
2538                              tq_avg > max_tq)) {
2539                                 if (curr_gw)
2540                                         batadv_gw_node_put(curr_gw);
2541                                 curr_gw = gw_node;
2542                                 kref_get(&curr_gw->refcount);
2543                         }
2544                         break;
2545
2546                 default: /* 2:  stable connection (use best statistic)
2547                           * 3:  fast-switch (use best statistic but change as
2548                           *     soon as a better gateway appears)
2549                           * XX: late-switch (use best statistic but change as
2550                           *     soon as a better gateway appears which has
2551                           *     $routing_class more tq points)
2552                           */
2553                         if (tq_avg > max_tq) {
2554                                 if (curr_gw)
2555                                         batadv_gw_node_put(curr_gw);
2556                                 curr_gw = gw_node;
2557                                 kref_get(&curr_gw->refcount);
2558                         }
2559                         break;
2560                 }
2561
2562                 if (tq_avg > max_tq)
2563                         max_tq = tq_avg;
2564
2565                 if (tmp_gw_factor > max_gw_factor)
2566                         max_gw_factor = tmp_gw_factor;
2567
2568                 batadv_gw_node_put(gw_node);
2569
2570 next:
2571                 batadv_neigh_node_put(router);
2572                 if (router_ifinfo)
2573                         batadv_neigh_ifinfo_put(router_ifinfo);
2574         }
2575         rcu_read_unlock();
2576
2577         return curr_gw;
2578 }
2579
2580 static bool batadv_iv_gw_is_eligible(struct batadv_priv *bat_priv,
2581                                      struct batadv_orig_node *curr_gw_orig,
2582                                      struct batadv_orig_node *orig_node)
2583 {
2584         struct batadv_neigh_ifinfo *router_orig_ifinfo = NULL;
2585         struct batadv_neigh_ifinfo *router_gw_ifinfo = NULL;
2586         struct batadv_neigh_node *router_gw = NULL;
2587         struct batadv_neigh_node *router_orig = NULL;
2588         u8 gw_tq_avg, orig_tq_avg;
2589         bool ret = false;
2590
2591         /* dynamic re-election is performed only on fast or late switch */
2592         if (atomic_read(&bat_priv->gw.sel_class) <= 2)
2593                 return false;
2594
2595         router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT);
2596         if (!router_gw) {
2597                 ret = true;
2598                 goto out;
2599         }
2600
2601         router_gw_ifinfo = batadv_neigh_ifinfo_get(router_gw,
2602                                                    BATADV_IF_DEFAULT);
2603         if (!router_gw_ifinfo) {
2604                 ret = true;
2605                 goto out;
2606         }
2607
2608         router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
2609         if (!router_orig)
2610                 goto out;
2611
2612         router_orig_ifinfo = batadv_neigh_ifinfo_get(router_orig,
2613                                                      BATADV_IF_DEFAULT);
2614         if (!router_orig_ifinfo)
2615                 goto out;
2616
2617         gw_tq_avg = router_gw_ifinfo->bat_iv.tq_avg;
2618         orig_tq_avg = router_orig_ifinfo->bat_iv.tq_avg;
2619
2620         /* the TQ value has to be better */
2621         if (orig_tq_avg < gw_tq_avg)
2622                 goto out;
2623
2624         /* if the routing class is greater than 3 the value tells us how much
2625          * greater the TQ value of the new gateway must be
2626          */
2627         if ((atomic_read(&bat_priv->gw.sel_class) > 3) &&
2628             (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw.sel_class)))
2629                 goto out;
2630
2631         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
2632                    "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n",
2633                    gw_tq_avg, orig_tq_avg);
2634
2635         ret = true;
2636 out:
2637         if (router_gw_ifinfo)
2638                 batadv_neigh_ifinfo_put(router_gw_ifinfo);
2639         if (router_orig_ifinfo)
2640                 batadv_neigh_ifinfo_put(router_orig_ifinfo);
2641         if (router_gw)
2642                 batadv_neigh_node_put(router_gw);
2643         if (router_orig)
2644                 batadv_neigh_node_put(router_orig);
2645
2646         return ret;
2647 }
2648
2649 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2650 /* fails if orig_node has no router */
2651 static int batadv_iv_gw_write_buffer_text(struct batadv_priv *bat_priv,
2652                                           struct seq_file *seq,
2653                                           const struct batadv_gw_node *gw_node)
2654 {
2655         struct batadv_gw_node *curr_gw;
2656         struct batadv_neigh_node *router;
2657         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
2658         int ret = -1;
2659
2660         router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
2661         if (!router)
2662                 goto out;
2663
2664         router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
2665         if (!router_ifinfo)
2666                 goto out;
2667
2668         curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
2669
2670         seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n",
2671                    (curr_gw == gw_node ? "=>" : "  "),
2672                    gw_node->orig_node->orig,
2673                    router_ifinfo->bat_iv.tq_avg, router->addr,
2674                    router->if_incoming->net_dev->name,
2675                    gw_node->bandwidth_down / 10,
2676                    gw_node->bandwidth_down % 10,
2677                    gw_node->bandwidth_up / 10,
2678                    gw_node->bandwidth_up % 10);
2679         ret = seq_has_overflowed(seq) ? -1 : 0;
2680
2681         if (curr_gw)
2682                 batadv_gw_node_put(curr_gw);
2683 out:
2684         if (router_ifinfo)
2685                 batadv_neigh_ifinfo_put(router_ifinfo);
2686         if (router)
2687                 batadv_neigh_node_put(router);
2688         return ret;
2689 }
2690
2691 static void batadv_iv_gw_print(struct batadv_priv *bat_priv,
2692                                struct seq_file *seq)
2693 {
2694         struct batadv_gw_node *gw_node;
2695         int gw_count = 0;
2696
2697         seq_puts(seq,
2698                  "      Gateway      (#/255)           Nexthop [outgoingIF]: advertised uplink bandwidth\n");
2699
2700         rcu_read_lock();
2701         hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) {
2702                 /* fails if orig_node has no router */
2703                 if (batadv_iv_gw_write_buffer_text(bat_priv, seq, gw_node) < 0)
2704                         continue;
2705
2706                 gw_count++;
2707         }
2708         rcu_read_unlock();
2709
2710         if (gw_count == 0)
2711                 seq_puts(seq, "No gateways in range ...\n");
2712 }
2713 #endif
2714
2715 /**
2716  * batadv_iv_gw_dump_entry() - Dump a gateway into a message
2717  * @msg: Netlink message to dump into
2718  * @portid: Port making netlink request
2719  * @seq: Sequence number of netlink message
2720  * @bat_priv: The bat priv with all the soft interface information
2721  * @gw_node: Gateway to be dumped
2722  *
2723  * Return: Error code, or 0 on success
2724  */
2725 static int batadv_iv_gw_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2726                                    struct batadv_priv *bat_priv,
2727                                    struct batadv_gw_node *gw_node)
2728 {
2729         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
2730         struct batadv_neigh_node *router;
2731         struct batadv_gw_node *curr_gw;
2732         int ret = -EINVAL;
2733         void *hdr;
2734
2735         router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
2736         if (!router)
2737                 goto out;
2738
2739         router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
2740         if (!router_ifinfo)
2741                 goto out;
2742
2743         curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
2744
2745         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2746                           NLM_F_MULTI, BATADV_CMD_GET_GATEWAYS);
2747         if (!hdr) {
2748                 ret = -ENOBUFS;
2749                 goto out;
2750         }
2751
2752         ret = -EMSGSIZE;
2753
2754         if (curr_gw == gw_node)
2755                 if (nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) {
2756                         genlmsg_cancel(msg, hdr);
2757                         goto out;
2758                 }
2759
2760         if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2761                     gw_node->orig_node->orig) ||
2762             nla_put_u8(msg, BATADV_ATTR_TQ, router_ifinfo->bat_iv.tq_avg) ||
2763             nla_put(msg, BATADV_ATTR_ROUTER, ETH_ALEN,
2764                     router->addr) ||
2765             nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
2766                            router->if_incoming->net_dev->name) ||
2767             nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN,
2768                         gw_node->bandwidth_down) ||
2769             nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP,
2770                         gw_node->bandwidth_up)) {
2771                 genlmsg_cancel(msg, hdr);
2772                 goto out;
2773         }
2774
2775         genlmsg_end(msg, hdr);
2776         ret = 0;
2777
2778 out:
2779         if (router_ifinfo)
2780                 batadv_neigh_ifinfo_put(router_ifinfo);
2781         if (router)
2782                 batadv_neigh_node_put(router);
2783         return ret;
2784 }
2785
2786 /**
2787  * batadv_iv_gw_dump() - Dump gateways into a message
2788  * @msg: Netlink message to dump into
2789  * @cb: Control block containing additional options
2790  * @bat_priv: The bat priv with all the soft interface information
2791  */
2792 static void batadv_iv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb,
2793                               struct batadv_priv *bat_priv)
2794 {
2795         int portid = NETLINK_CB(cb->skb).portid;
2796         struct batadv_gw_node *gw_node;
2797         int idx_skip = cb->args[0];
2798         int idx = 0;
2799
2800         rcu_read_lock();
2801         hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) {
2802                 if (idx++ < idx_skip)
2803                         continue;
2804
2805                 if (batadv_iv_gw_dump_entry(msg, portid, cb->nlh->nlmsg_seq,
2806                                             bat_priv, gw_node)) {
2807                         idx_skip = idx - 1;
2808                         goto unlock;
2809                 }
2810         }
2811
2812         idx_skip = idx;
2813 unlock:
2814         rcu_read_unlock();
2815
2816         cb->args[0] = idx_skip;
2817 }
2818
2819 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
2820         .name = "BATMAN_IV",
2821         .iface = {
2822                 .activate = batadv_iv_iface_activate,
2823                 .enable = batadv_iv_ogm_iface_enable,
2824                 .disable = batadv_iv_ogm_iface_disable,
2825                 .update_mac = batadv_iv_ogm_iface_update_mac,
2826                 .primary_set = batadv_iv_ogm_primary_iface_set,
2827         },
2828         .neigh = {
2829                 .cmp = batadv_iv_ogm_neigh_cmp,
2830                 .is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
2831 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2832                 .print = batadv_iv_neigh_print,
2833 #endif
2834                 .dump = batadv_iv_ogm_neigh_dump,
2835         },
2836         .orig = {
2837 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2838                 .print = batadv_iv_ogm_orig_print,
2839 #endif
2840                 .dump = batadv_iv_ogm_orig_dump,
2841                 .free = batadv_iv_ogm_orig_free,
2842                 .add_if = batadv_iv_ogm_orig_add_if,
2843                 .del_if = batadv_iv_ogm_orig_del_if,
2844         },
2845         .gw = {
2846                 .init_sel_class = batadv_iv_init_sel_class,
2847                 .get_best_gw_node = batadv_iv_gw_get_best_gw_node,
2848                 .is_eligible = batadv_iv_gw_is_eligible,
2849 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2850                 .print = batadv_iv_gw_print,
2851 #endif
2852                 .dump = batadv_iv_gw_dump,
2853         },
2854 };
2855
2856 /**
2857  * batadv_iv_init() - B.A.T.M.A.N. IV initialization function
2858  *
2859  * Return: 0 on success or negative error number in case of failure
2860  */
2861 int __init batadv_iv_init(void)
2862 {
2863         int ret;
2864
2865         /* batman originator packet */
2866         ret = batadv_recv_handler_register(BATADV_IV_OGM,
2867                                            batadv_iv_ogm_receive);
2868         if (ret < 0)
2869                 goto out;
2870
2871         ret = batadv_algo_register(&batadv_batman_iv);
2872         if (ret < 0)
2873                 goto handler_unregister;
2874
2875         goto out;
2876
2877 handler_unregister:
2878         batadv_recv_handler_unregister(BATADV_IV_OGM);
2879 out:
2880         return ret;
2881 }