net/batman-adv/bat_iv_ogm.c

   1 /* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "bat_algo.h"
  19 #include "main.h"
  20
  21 #include <linux/atomic.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/bitops.h>
  24 #include <linux/bug.h>
  25 #include <linux/byteorder/generic.h>
  26 #include <linux/cache.h>
  27 #include <linux/errno.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/fs.h>
  30 #include <linux/if_ether.h>
  31 #include <linux/init.h>
  32 #include <linux/jiffies.h>
  33 #include <linux/list.h>
  34 #include <linux/kref.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/pkt_sched.h>
  37 #include <linux/printk.h>
  38 #include <linux/random.h>
  39 #include <linux/rculist.h>
  40 #include <linux/rcupdate.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/skbuff.h>
  43 #include <linux/slab.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/stddef.h>
  46 #include <linux/string.h>
  47 #include <linux/types.h>
  48 #include <linux/workqueue.h>
  49
  50 #include "bitarray.h"
  51 #include "hard-interface.h"
  52 #include "hash.h"
  53 #include "network-coding.h"
  54 #include "originator.h"
  55 #include "packet.h"
  56 #include "routing.h"
  57 #include "send.h"
  58 #include "translation-table.h"
  59
  60 /**
  61  * enum batadv_dup_status - duplicate status
  62  * @BATADV_NO_DUP: the packet is no duplicate
  63  * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
  64  *  neighbor)
  65  * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
  66  * @BATADV_PROTECTED: originator is currently protected (after reboot)
  67  */
  68 enum batadv_dup_status {
  69         BATADV_NO_DUP = 0,
  70         BATADV_ORIG_DUP,
  71         BATADV_NEIGH_DUP,
  72         BATADV_PROTECTED,
  73 };
  74
  75 /**
  76  * batadv_ring_buffer_set - update the ring buffer with the given value
  77  * @lq_recv: pointer to the ring buffer
  78  * @lq_index: index to store the value at
  79  * @value: value to store in the ring buffer
  80  */
  81 static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value)
  82 {
  83         lq_recv[*lq_index] = value;
  84         *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
  85 }
  86
  87 /**
  88  * batadv_ring_buffer_avg - compute the average of all non-zero values stored
  89  * in the given ring buffer
  90  * @lq_recv: pointer to the ring buffer
  91  *
  92  * Return: computed average value.
  93  */
  94 static u8 batadv_ring_buffer_avg(const u8 lq_recv[])
  95 {
  96         const u8 *ptr;
  97         u16 count = 0;
  98         u16 i = 0;
  99         u16 sum = 0;
 100
 101         ptr = lq_recv;
 102
 103         while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
 104                 if (*ptr != 0) {
 105                         count++;
 106                         sum += *ptr;
 107                 }
 108
 109                 i++;
 110                 ptr++;
 111         }
 112
 113         if (count == 0)
 114                 return 0;
 115
 116         return (u8)(sum / count);
 117 }
 118
 119 /**
 120  * batadv_iv_ogm_orig_free - free the private resources allocated for this
 121  *  orig_node
 122  * @orig_node: the orig_node for which the resources have to be free'd
 123  */
 124 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
 125 {
 126         kfree(orig_node->bat_iv.bcast_own);
 127         kfree(orig_node->bat_iv.bcast_own_sum);
 128 }
 129
 130 /**
 131  * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
 132  *  include the new hard-interface
 133  * @orig_node: the orig_node that has to be changed
 134  * @max_if_num: the current amount of interfaces
 135  *
 136  * Return: 0 on success, a negative error code otherwise.
 137  */
 138 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
 139                                      int max_if_num)
 140 {
 141         void *data_ptr;
 142         size_t old_size;
 143         int ret = -ENOMEM;
 144
 145         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 146
 147         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 148         data_ptr = kmalloc_array(max_if_num,
 149                                  BATADV_NUM_WORDS * sizeof(unsigned long),
 150                                  GFP_ATOMIC);
 151         if (!data_ptr)
 152                 goto unlock;
 153
 154         memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
 155         kfree(orig_node->bat_iv.bcast_own);
 156         orig_node->bat_iv.bcast_own = data_ptr;
 157
 158         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 159         if (!data_ptr) {
 160                 kfree(orig_node->bat_iv.bcast_own);
 161                 goto unlock;
 162         }
 163
 164         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 165                (max_if_num - 1) * sizeof(u8));
 166         kfree(orig_node->bat_iv.bcast_own_sum);
 167         orig_node->bat_iv.bcast_own_sum = data_ptr;
 168
 169         ret = 0;
 170
 171 unlock:
 172         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 173
 174         return ret;
 175 }
 176
 177 /**
 178  * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
 179  *  exclude the removed interface
 180  * @orig_node: the orig_node that has to be changed
 181  * @max_if_num: the current amount of interfaces
 182  * @del_if_num: the index of the interface being removed
 183  *
 184  * Return: 0 on success, a negative error code otherwise.
 185  */
 186 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
 187                                      int max_if_num, int del_if_num)
 188 {
 189         int ret = -ENOMEM;
 190         size_t chunk_size, if_offset;
 191         void *data_ptr = NULL;
 192
 193         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 194
 195         /* last interface was removed */
 196         if (max_if_num == 0)
 197                 goto free_bcast_own;
 198
 199         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 200         data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
 201         if (!data_ptr)
 202                 goto unlock;
 203
 204         /* copy first part */
 205         memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
 206
 207         /* copy second part */
 208         if_offset = (del_if_num + 1) * chunk_size;
 209         memcpy((char *)data_ptr + del_if_num * chunk_size,
 210                (uint8_t *)orig_node->bat_iv.bcast_own + if_offset,
 211                (max_if_num - del_if_num) * chunk_size);
 212
 213 free_bcast_own:
 214         kfree(orig_node->bat_iv.bcast_own);
 215         orig_node->bat_iv.bcast_own = data_ptr;
 216
 217         if (max_if_num == 0)
 218                 goto free_own_sum;
 219
 220         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 221         if (!data_ptr) {
 222                 kfree(orig_node->bat_iv.bcast_own);
 223                 goto unlock;
 224         }
 225
 226         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 227                del_if_num * sizeof(u8));
 228
 229         if_offset = (del_if_num + 1) * sizeof(u8);
 230         memcpy((char *)data_ptr + del_if_num * sizeof(u8),
 231                orig_node->bat_iv.bcast_own_sum + if_offset,
 232                (max_if_num - del_if_num) * sizeof(u8));
 233
 234 free_own_sum:
 235         kfree(orig_node->bat_iv.bcast_own_sum);
 236         orig_node->bat_iv.bcast_own_sum = data_ptr;
 237
 238         ret = 0;
 239 unlock:
 240         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 241
 242         return ret;
 243 }
 244
 245 /**
 246  * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
 247  * @bat_priv: the bat priv with all the soft interface information
 248  * @addr: mac address of the originator
 249  *
 250  * Return: the originator object corresponding to the passed mac address or NULL
 251  * on failure.
 252  * If the object does not exists it is created an initialised.
 253  */
 254 static struct batadv_orig_node *
 255 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr)
 256 {
 257         struct batadv_orig_node *orig_node;
 258         int size, hash_added;
 259
 260         orig_node = batadv_orig_hash_find(bat_priv, addr);
 261         if (orig_node)
 262                 return orig_node;
 263
 264         orig_node = batadv_orig_node_new(bat_priv, addr);
 265         if (!orig_node)
 266                 return NULL;
 267
 268         spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
 269
 270         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 271         orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
 272         if (!orig_node->bat_iv.bcast_own)
 273                 goto free_orig_node;
 274
 275         size = bat_priv->num_ifaces * sizeof(u8);
 276         orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 277         if (!orig_node->bat_iv.bcast_own_sum)
 278                 goto free_orig_node;
 279
 280         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 281                                      batadv_choose_orig, orig_node,
 282                                      &orig_node->hash_entry);
 283         if (hash_added != 0)
 284                 goto free_orig_node;
 285
 286         return orig_node;
 287
 288 free_orig_node:
 289         /* free twice, as batadv_orig_node_new sets refcount to 2 */
 290         batadv_orig_node_put(orig_node);
 291         batadv_orig_node_put(orig_node);
 292
 293         return NULL;
 294 }
 295
 296 static struct batadv_neigh_node *
 297 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
 298                         const u8 *neigh_addr,
 299                         struct batadv_orig_node *orig_node,
 300                         struct batadv_orig_node *orig_neigh)
 301 {
 302         struct batadv_neigh_node *neigh_node;
 303
 304         neigh_node = batadv_neigh_node_new(orig_node, hard_iface, neigh_addr);
 305         if (!neigh_node)
 306                 goto out;
 307
 308         neigh_node->orig_node = orig_neigh;
 309
 310 out:
 311         return neigh_node;
 312 }
 313
 314 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
 315 {
 316         struct batadv_ogm_packet *batadv_ogm_packet;
 317         unsigned char *ogm_buff;
 318         u32 random_seqno;
 319
 320         /* randomize initial seqno to avoid collision */
 321         get_random_bytes(&random_seqno, sizeof(random_seqno));
 322         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 323
 324         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 325         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 326         if (!ogm_buff)
 327                 return -ENOMEM;
 328
 329         hard_iface->bat_iv.ogm_buff = ogm_buff;
 330
 331         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 332         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 333         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 334         batadv_ogm_packet->ttl = 2;
 335         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 336         batadv_ogm_packet->reserved = 0;
 337         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 338
 339         return 0;
 340 }
 341
 342 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 343 {
 344         kfree(hard_iface->bat_iv.ogm_buff);
 345         hard_iface->bat_iv.ogm_buff = NULL;
 346 }
 347
 348 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 349 {
 350         struct batadv_ogm_packet *batadv_ogm_packet;
 351         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 352
 353         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 354         ether_addr_copy(batadv_ogm_packet->orig,
 355                         hard_iface->net_dev->dev_addr);
 356         ether_addr_copy(batadv_ogm_packet->prev_sender,
 357                         hard_iface->net_dev->dev_addr);
 358 }
 359
 360 static void
 361 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 362 {
 363         struct batadv_ogm_packet *batadv_ogm_packet;
 364         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 365
 366         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 367         batadv_ogm_packet->ttl = BATADV_TTL;
 368 }
 369
 370 /* when do we schedule our own ogm to be sent */
 371 static unsigned long
 372 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 373 {
 374         unsigned int msecs;
 375
 376         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 377         msecs += prandom_u32() % (2 * BATADV_JITTER);
 378
 379         return jiffies + msecs_to_jiffies(msecs);
 380 }
 381
 382 /* when do we schedule a ogm packet to be sent */
 383 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 384 {
 385         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 386 }
 387
 388 /* apply hop penalty for a normal link */
 389 static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv)
 390 {
 391         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 392         int new_tq;
 393
 394         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 395         new_tq /= BATADV_TQ_MAX_VALUE;
 396
 397         return new_tq;
 398 }
 399
 400 /**
 401  * batadv_iv_ogm_aggr_packet - checks if there is another OGM attached
 402  * @buff_pos: current position in the skb
 403  * @packet_len: total length of the skb
 404  * @tvlv_len: tvlv length of the previously considered OGM
 405  *
 406  * Return: true if there is enough space for another OGM, false otherwise.
 407  */
 408 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 409                                       __be16 tvlv_len)
 410 {
 411         int next_buff_pos = 0;
 412
 413         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 414         next_buff_pos += ntohs(tvlv_len);
 415
 416         return (next_buff_pos <= packet_len) &&
 417                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 418 }
 419
 420 /* send a batman ogm to a given interface */
 421 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 422                                      struct batadv_hard_iface *hard_iface)
 423 {
 424         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 425         const char *fwd_str;
 426         u8 packet_num;
 427         s16 buff_pos;
 428         struct batadv_ogm_packet *batadv_ogm_packet;
 429         struct sk_buff *skb;
 430         u8 *packet_pos;
 431
 432         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 433                 return;
 434
 435         packet_num = 0;
 436         buff_pos = 0;
 437         packet_pos = forw_packet->skb->data;
 438         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 439
 440         /* adjust all flags and log packets */
 441         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 442                                          batadv_ogm_packet->tvlv_len)) {
 443                 /* we might have aggregated direct link packets with an
 444                  * ordinary base packet
 445                  */
 446                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 447                     forw_packet->if_incoming == hard_iface)
 448                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 449                 else
 450                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 451
 452                 if (packet_num > 0 || !forw_packet->own)
 453                         fwd_str = "Forwarding";
 454                 else
 455                         fwd_str = "Sending own";
 456
 457                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 458                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 459                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 460                            batadv_ogm_packet->orig,
 461                            ntohl(batadv_ogm_packet->seqno),
 462                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 463                            ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ?
 464                             "on" : "off"),
 465                            hard_iface->net_dev->name,
 466                            hard_iface->net_dev->dev_addr);
 467
 468                 buff_pos += BATADV_OGM_HLEN;
 469                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 470                 packet_num++;
 471                 packet_pos = forw_packet->skb->data + buff_pos;
 472                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 473         }
 474
 475         /* create clone because function is called more than once */
 476         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 477         if (skb) {
 478                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 479                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 480                                    skb->len + ETH_HLEN);
 481                 batadv_send_broadcast_skb(skb, hard_iface);
 482         }
 483 }
 484
 485 /* send a batman ogm packet */
 486 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 487 {
 488         struct net_device *soft_iface;
 489         struct batadv_priv *bat_priv;
 490         struct batadv_hard_iface *primary_if = NULL;
 491
 492         if (!forw_packet->if_incoming) {
 493                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 494                 goto out;
 495         }
 496
 497         soft_iface = forw_packet->if_incoming->soft_iface;
 498         bat_priv = netdev_priv(soft_iface);
 499
 500         if (WARN_ON(!forw_packet->if_outgoing))
 501                 goto out;
 502
 503         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 504                 goto out;
 505
 506         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 507                 goto out;
 508
 509         primary_if = batadv_primary_if_get_selected(bat_priv);
 510         if (!primary_if)
 511                 goto out;
 512
 513         /* only for one specific outgoing interface */
 514         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 515
 516 out:
 517         if (primary_if)
 518                 batadv_hardif_put(primary_if);
 519 }
 520
 521 /**
 522  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 523  *  existing forward packet
 524  * @new_bat_ogm_packet: OGM packet to be aggregated
 525  * @bat_priv: the bat priv with all the soft interface information
 526  * @packet_len: (total) length of the OGM
 527  * @send_time: timestamp (jiffies) when the packet is to be sent
 528  * @directlink: true if this is a direct link packet
 529  * @if_incoming: interface where the packet was received
 530  * @if_outgoing: interface for which the retransmission should be considered
 531  * @forw_packet: the forwarded packet which should be checked
 532  *
 533  * Return: true if new_packet can be aggregated with forw_packet
 534  */
 535 static bool
 536 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 537                             struct batadv_priv *bat_priv,
 538                             int packet_len, unsigned long send_time,
 539                             bool directlink,
 540                             const struct batadv_hard_iface *if_incoming,
 541                             const struct batadv_hard_iface *if_outgoing,
 542                             const struct batadv_forw_packet *forw_packet)
 543 {
 544         struct batadv_ogm_packet *batadv_ogm_packet;
 545         int aggregated_bytes = forw_packet->packet_len + packet_len;
 546         struct batadv_hard_iface *primary_if = NULL;
 547         bool res = false;
 548         unsigned long aggregation_end_time;
 549
 550         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 551         aggregation_end_time = send_time;
 552         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 553
 554         /* we can aggregate the current packet to this aggregated packet
 555          * if:
 556          *
 557          * - the send time is within our MAX_AGGREGATION_MS time
 558          * - the resulting packet wont be bigger than
 559          *   MAX_AGGREGATION_BYTES
 560          * otherwise aggregation is not possible
 561          */
 562         if (!time_before(send_time, forw_packet->send_time) ||
 563             !time_after_eq(aggregation_end_time, forw_packet->send_time))
 564                 return false;
 565
 566         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
 567                 return false;
 568
 569         /* packet is not leaving on the same interface. */
 570         if (forw_packet->if_outgoing != if_outgoing)
 571                 return false;
 572
 573         /* check aggregation compatibility
 574          * -> direct link packets are broadcasted on
 575          *    their interface only
 576          * -> aggregate packet if the current packet is
 577          *    a "global" packet as well as the base
 578          *    packet
 579          */
 580         primary_if = batadv_primary_if_get_selected(bat_priv);
 581         if (!primary_if)
 582                 return false;
 583
 584         /* packets without direct link flag and high TTL
 585          * are flooded through the net
 586          */
 587         if (!directlink &&
 588             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
 589             batadv_ogm_packet->ttl != 1 &&
 590
 591             /* own packets originating non-primary
 592              * interfaces leave only that interface
 593              */
 594             (!forw_packet->own ||
 595              forw_packet->if_incoming == primary_if)) {
 596                 res = true;
 597                 goto out;
 598         }
 599
 600         /* if the incoming packet is sent via this one
 601          * interface only - we still can aggregate
 602          */
 603         if (directlink &&
 604             new_bat_ogm_packet->ttl == 1 &&
 605             forw_packet->if_incoming == if_incoming &&
 606
 607             /* packets from direct neighbors or
 608              * own secondary interface packets
 609              * (= secondary interface packets in general)
 610              */
 611             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 612              (forw_packet->own &&
 613               forw_packet->if_incoming != primary_if))) {
 614                 res = true;
 615                 goto out;
 616         }
 617
 618 out:
 619         if (primary_if)
 620                 batadv_hardif_put(primary_if);
 621         return res;
 622 }
 623
 624 /**
 625  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
 626  *  packet to it.
 627  * @packet_buff: pointer to the OGM
 628  * @packet_len: (total) length of the OGM
 629  * @send_time: timestamp (jiffies) when the packet is to be sent
 630  * @direct_link: whether this OGM has direct link status
 631  * @if_incoming: interface where the packet was received
 632  * @if_outgoing: interface for which the retransmission should be considered
 633  * @own_packet: true if it is a self-generated ogm
 634  */
 635 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 636                                         int packet_len, unsigned long send_time,
 637                                         bool direct_link,
 638                                         struct batadv_hard_iface *if_incoming,
 639                                         struct batadv_hard_iface *if_outgoing,
 640                                         int own_packet)
 641 {
 642         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 643         struct batadv_forw_packet *forw_packet_aggr;
 644         unsigned char *skb_buff;
 645         unsigned int skb_size;
 646
 647         if (!kref_get_unless_zero(&if_incoming->refcount))
 648                 return;
 649
 650         if (!kref_get_unless_zero(&if_outgoing->refcount))
 651                 goto out_free_incoming;
 652
 653         /* own packet should always be scheduled */
 654         if (!own_packet) {
 655                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 656                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 657                                    "batman packet queue full\n");
 658                         goto out_free_outgoing;
 659                 }
 660         }
 661
 662         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 663         if (!forw_packet_aggr)
 664                 goto out_nomem;
 665
 666         if (atomic_read(&bat_priv->aggregated_ogms) &&
 667             packet_len < BATADV_MAX_AGGREGATION_BYTES)
 668                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 669         else
 670                 skb_size = packet_len;
 671
 672         skb_size += ETH_HLEN;
 673
 674         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 675         if (!forw_packet_aggr->skb)
 676                 goto out_free_forw_packet;
 677         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 678         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 679
 680         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 681         forw_packet_aggr->packet_len = packet_len;
 682         memcpy(skb_buff, packet_buff, packet_len);
 683
 684         forw_packet_aggr->own = own_packet;
 685         forw_packet_aggr->if_incoming = if_incoming;
 686         forw_packet_aggr->if_outgoing = if_outgoing;
 687         forw_packet_aggr->num_packets = 0;
 688         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 689         forw_packet_aggr->send_time = send_time;
 690
 691         /* save packet direct link flag status */
 692         if (direct_link)
 693                 forw_packet_aggr->direct_link_flags |= 1;
 694
 695         /* add new packet to packet list */
 696         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 697         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 698         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 699
 700         /* start timer for this packet */
 701         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 702                           batadv_send_outstanding_bat_ogm_packet);
 703         queue_delayed_work(batadv_event_workqueue,
 704                            &forw_packet_aggr->delayed_work,
 705                            send_time - jiffies);
 706
 707         return;
 708 out_free_forw_packet:
 709         kfree(forw_packet_aggr);
 710 out_nomem:
 711         if (!own_packet)
 712                 atomic_inc(&bat_priv->batman_queue_left);
 713 out_free_outgoing:
 714         batadv_hardif_put(if_outgoing);
 715 out_free_incoming:
 716         batadv_hardif_put(if_incoming);
 717 }
 718
 719 /* aggregate a new packet into the existing ogm packet */
 720 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 721                                     const unsigned char *packet_buff,
 722                                     int packet_len, bool direct_link)
 723 {
 724         unsigned char *skb_buff;
 725         unsigned long new_direct_link_flag;
 726
 727         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 728         memcpy(skb_buff, packet_buff, packet_len);
 729         forw_packet_aggr->packet_len += packet_len;
 730         forw_packet_aggr->num_packets++;
 731
 732         /* save packet direct link flag status */
 733         if (direct_link) {
 734                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 735                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 736         }
 737 }
 738
 739 /**
 740  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 741  * @bat_priv: the bat priv with all the soft interface information
 742  * @packet_buff: pointer to the OGM
 743  * @packet_len: (total) length of the OGM
 744  * @if_incoming: interface where the packet was received
 745  * @if_outgoing: interface for which the retransmission should be considered
 746  * @own_packet: true if it is a self-generated ogm
 747  * @send_time: timestamp (jiffies) when the packet is to be sent
 748  */
 749 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 750                                     unsigned char *packet_buff,
 751                                     int packet_len,
 752                                     struct batadv_hard_iface *if_incoming,
 753                                     struct batadv_hard_iface *if_outgoing,
 754                                     int own_packet, unsigned long send_time)
 755 {
 756         /* _aggr -> pointer to the packet we want to aggregate with
 757          * _pos -> pointer to the position in the queue
 758          */
 759         struct batadv_forw_packet *forw_packet_aggr = NULL;
 760         struct batadv_forw_packet *forw_packet_pos = NULL;
 761         struct batadv_ogm_packet *batadv_ogm_packet;
 762         bool direct_link;
 763         unsigned long max_aggregation_jiffies;
 764
 765         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 766         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 767         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 768
 769         /* find position for the packet in the forward queue */
 770         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 771         /* own packets are not to be aggregated */
 772         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 773                 hlist_for_each_entry(forw_packet_pos,
 774                                      &bat_priv->forw_bat_list, list) {
 775                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 776                                                         bat_priv, packet_len,
 777                                                         send_time, direct_link,
 778                                                         if_incoming,
 779                                                         if_outgoing,
 780                                                         forw_packet_pos)) {
 781                                 forw_packet_aggr = forw_packet_pos;
 782                                 break;
 783                         }
 784                 }
 785         }
 786
 787         /* nothing to aggregate with - either aggregation disabled or no
 788          * suitable aggregation packet found
 789          */
 790         if (!forw_packet_aggr) {
 791                 /* the following section can run without the lock */
 792                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 793
 794                 /* if we could not aggregate this packet with one of the others
 795                  * we hold it back for a while, so that it might be aggregated
 796                  * later on
 797                  */
 798                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 799                         send_time += max_aggregation_jiffies;
 800
 801                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 802                                             send_time, direct_link,
 803                                             if_incoming, if_outgoing,
 804                                             own_packet);
 805         } else {
 806                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 807                                         packet_len, direct_link);
 808                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 809         }
 810 }
 811
 812 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 813                                   const struct ethhdr *ethhdr,
 814                                   struct batadv_ogm_packet *batadv_ogm_packet,
 815                                   bool is_single_hop_neigh,
 816                                   bool is_from_best_next_hop,
 817                                   struct batadv_hard_iface *if_incoming,
 818                                   struct batadv_hard_iface *if_outgoing)
 819 {
 820         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 821         u16 tvlv_len;
 822
 823         if (batadv_ogm_packet->ttl <= 1) {
 824                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 825                 return;
 826         }
 827
 828         if (!is_from_best_next_hop) {
 829                 /* Mark the forwarded packet when it is not coming from our
 830                  * best next hop. We still need to forward the packet for our
 831                  * neighbor link quality detection to work in case the packet
 832                  * originated from a single hop neighbor. Otherwise we can
 833                  * simply drop the ogm.
 834                  */
 835                 if (is_single_hop_neigh)
 836                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 837                 else
 838                         return;
 839         }
 840
 841         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 842
 843         batadv_ogm_packet->ttl--;
 844         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 845
 846         /* apply hop penalty */
 847         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 848                                                    bat_priv);
 849
 850         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 851                    "Forwarding packet: tq: %i, ttl: %i\n",
 852                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 853
 854         if (is_single_hop_neigh)
 855                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 856         else
 857                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 858
 859         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 860                                 BATADV_OGM_HLEN + tvlv_len,
 861                                 if_incoming, if_outgoing, 0,
 862                                 batadv_iv_ogm_fwd_send_time());
 863 }
 864
 865 /**
 866  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 867  * the given interface
 868  * @hard_iface: the interface for which the windows have to be shifted
 869  */
 870 static void
 871 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 872 {
 873         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 874         struct batadv_hashtable *hash = bat_priv->orig_hash;
 875         struct hlist_head *head;
 876         struct batadv_orig_node *orig_node;
 877         unsigned long *word;
 878         u32 i;
 879         size_t word_index;
 880         u8 *w;
 881         int if_num;
 882
 883         for (i = 0; i < hash->size; i++) {
 884                 head = &hash->table[i];
 885
 886                 rcu_read_lock();
 887                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 888                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 889                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 890                         word = &orig_node->bat_iv.bcast_own[word_index];
 891
 892                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 893                         if_num = hard_iface->if_num;
 894                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 895                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 896                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 897                 }
 898                 rcu_read_unlock();
 899         }
 900 }
 901
 902 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 903 {
 904         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 905         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 906         struct batadv_ogm_packet *batadv_ogm_packet;
 907         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 908         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 909         u32 seqno;
 910         u16 tvlv_len = 0;
 911         unsigned long send_time;
 912
 913         primary_if = batadv_primary_if_get_selected(bat_priv);
 914
 915         if (hard_iface == primary_if) {
 916                 /* tt changes have to be committed before the tvlv data is
 917                  * appended as it may alter the tt tvlv container
 918                  */
 919                 batadv_tt_local_commit_changes(bat_priv);
 920                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 921                                                             ogm_buff_len,
 922                                                             BATADV_OGM_HLEN);
 923         }
 924
 925         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 926         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 927
 928         /* change sequence number to network order */
 929         seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 930         batadv_ogm_packet->seqno = htonl(seqno);
 931         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 932
 933         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 934
 935         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 936
 937         if (hard_iface != primary_if) {
 938                 /* OGMs from secondary interfaces are only scheduled on their
 939                  * respective interfaces.
 940                  */
 941                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 942                                         hard_iface, hard_iface, 1, send_time);
 943                 goto out;
 944         }
 945
 946         /* OGMs from primary interfaces are scheduled on all
 947          * interfaces.
 948          */
 949         rcu_read_lock();
 950         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 951                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 952                         continue;
 953                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 954                                         *ogm_buff_len, hard_iface,
 955                                         tmp_hard_iface, 1, send_time);
 956         }
 957         rcu_read_unlock();
 958
 959 out:
 960         if (primary_if)
 961                 batadv_hardif_put(primary_if);
 962 }
 963
 964 /**
 965  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
 966  *  originator
 967  * @bat_priv: the bat priv with all the soft interface information
 968  * @orig_node: the orig node who originally emitted the ogm packet
 969  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
 970  * @ethhdr: Ethernet header of the OGM
 971  * @batadv_ogm_packet: the ogm packet
 972  * @if_incoming: interface where the packet was received
 973  * @if_outgoing: interface for which the retransmission should be considered
 974  * @dup_status: the duplicate status of this ogm packet.
 975  */
 976 static void
 977 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 978                           struct batadv_orig_node *orig_node,
 979                           struct batadv_orig_ifinfo *orig_ifinfo,
 980                           const struct ethhdr *ethhdr,
 981                           const struct batadv_ogm_packet *batadv_ogm_packet,
 982                           struct batadv_hard_iface *if_incoming,
 983                           struct batadv_hard_iface *if_outgoing,
 984                           enum batadv_dup_status dup_status)
 985 {
 986         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
 987         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
 988         struct batadv_neigh_node *neigh_node = NULL;
 989         struct batadv_neigh_node *tmp_neigh_node = NULL;
 990         struct batadv_neigh_node *router = NULL;
 991         struct batadv_orig_node *orig_node_tmp;
 992         int if_num;
 993         u8 sum_orig, sum_neigh;
 994         u8 *neigh_addr;
 995         u8 tq_avg;
 996
 997         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 998                    "update_originator(): Searching and updating originator entry of received packet\n");
 999
1000         rcu_read_lock();
1001         hlist_for_each_entry_rcu(tmp_neigh_node,
1002                                  &orig_node->neigh_list, list) {
1003                 neigh_addr = tmp_neigh_node->addr;
1004                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1005                     tmp_neigh_node->if_incoming == if_incoming &&
1006                     kref_get_unless_zero(&tmp_neigh_node->refcount)) {
1007                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1008                                 batadv_neigh_node_put(neigh_node);
1009                         neigh_node = tmp_neigh_node;
1010                         continue;
1011                 }
1012
1013                 if (dup_status != BATADV_NO_DUP)
1014                         continue;
1015
1016                 /* only update the entry for this outgoing interface */
1017                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1018                                                        if_outgoing);
1019                 if (!neigh_ifinfo)
1020                         continue;
1021
1022                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1023                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1024                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1025                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1026                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1027                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1028
1029                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1030                 neigh_ifinfo = NULL;
1031         }
1032
1033         if (!neigh_node) {
1034                 struct batadv_orig_node *orig_tmp;
1035
1036                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1037                 if (!orig_tmp)
1038                         goto unlock;
1039
1040                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1041                                                      ethhdr->h_source,
1042                                                      orig_node, orig_tmp);
1043
1044                 batadv_orig_node_put(orig_tmp);
1045                 if (!neigh_node)
1046                         goto unlock;
1047         } else {
1048                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1049                            "Updating existing last-hop neighbor of originator\n");
1050         }
1051
1052         rcu_read_unlock();
1053         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1054         if (!neigh_ifinfo)
1055                 goto out;
1056
1057         neigh_node->last_seen = jiffies;
1058
1059         spin_lock_bh(&neigh_node->ifinfo_lock);
1060         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1061                                &neigh_ifinfo->bat_iv.tq_index,
1062                                batadv_ogm_packet->tq);
1063         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1064         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1065         spin_unlock_bh(&neigh_node->ifinfo_lock);
1066
1067         if (dup_status == BATADV_NO_DUP) {
1068                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1069                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1070         }
1071
1072         /* if this neighbor already is our next hop there is nothing
1073          * to change
1074          */
1075         router = batadv_orig_router_get(orig_node, if_outgoing);
1076         if (router == neigh_node)
1077                 goto out;
1078
1079         if (router) {
1080                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1081                 if (!router_ifinfo)
1082                         goto out;
1083
1084                 /* if this neighbor does not offer a better TQ we won't
1085                  * consider it
1086                  */
1087                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1088                         goto out;
1089         }
1090
1091         /* if the TQ is the same and the link not more symmetric we
1092          * won't consider it either
1093          */
1094         if (router_ifinfo &&
1095             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1096                 orig_node_tmp = router->orig_node;
1097                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1098                 if_num = router->if_incoming->if_num;
1099                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1100                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1101
1102                 orig_node_tmp = neigh_node->orig_node;
1103                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1104                 if_num = neigh_node->if_incoming->if_num;
1105                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1106                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1107
1108                 if (sum_orig >= sum_neigh)
1109                         goto out;
1110         }
1111
1112         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1113         goto out;
1114
1115 unlock:
1116         rcu_read_unlock();
1117 out:
1118         if (neigh_node)
1119                 batadv_neigh_node_put(neigh_node);
1120         if (router)
1121                 batadv_neigh_node_put(router);
1122         if (neigh_ifinfo)
1123                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1124         if (router_ifinfo)
1125                 batadv_neigh_ifinfo_put(router_ifinfo);
1126 }
1127
1128 /**
1129  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1130  * @orig_node: the orig node who originally emitted the ogm packet
1131  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1132  * @batadv_ogm_packet: the ogm packet
1133  * @if_incoming: interface where the packet was received
1134  * @if_outgoing: interface for which the retransmission should be considered
1135  *
1136  * Return: 1 if the link can be considered bidirectional, 0 otherwise
1137  */
1138 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1139                                  struct batadv_orig_node *orig_neigh_node,
1140                                  struct batadv_ogm_packet *batadv_ogm_packet,
1141                                  struct batadv_hard_iface *if_incoming,
1142                                  struct batadv_hard_iface *if_outgoing)
1143 {
1144         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1145         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1146         struct batadv_neigh_ifinfo *neigh_ifinfo;
1147         u8 total_count;
1148         u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1149         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1150         int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
1151         unsigned int combined_tq;
1152         int tq_iface_penalty;
1153
1154         /* find corresponding one hop neighbor */
1155         rcu_read_lock();
1156         hlist_for_each_entry_rcu(tmp_neigh_node,
1157                                  &orig_neigh_node->neigh_list, list) {
1158                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1159                                         orig_neigh_node->orig))
1160                         continue;
1161
1162                 if (tmp_neigh_node->if_incoming != if_incoming)
1163                         continue;
1164
1165                 if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
1166                         continue;
1167
1168                 neigh_node = tmp_neigh_node;
1169                 break;
1170         }
1171         rcu_read_unlock();
1172
1173         if (!neigh_node)
1174                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1175                                                      orig_neigh_node->orig,
1176                                                      orig_neigh_node,
1177                                                      orig_neigh_node);
1178
1179         if (!neigh_node)
1180                 goto out;
1181
1182         /* if orig_node is direct neighbor update neigh_node last_seen */
1183         if (orig_node == orig_neigh_node)
1184                 neigh_node->last_seen = jiffies;
1185
1186         orig_node->last_seen = jiffies;
1187
1188         /* find packet count of corresponding one hop neighbor */
1189         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1190         if_num = if_incoming->if_num;
1191         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1192         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1193         if (neigh_ifinfo) {
1194                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1195                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1196         } else {
1197                 neigh_rq_count = 0;
1198         }
1199         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1200
1201         /* pay attention to not get a value bigger than 100 % */
1202         if (orig_eq_count > neigh_rq_count)
1203                 total_count = neigh_rq_count;
1204         else
1205                 total_count = orig_eq_count;
1206
1207         /* if we have too few packets (too less data) we set tq_own to zero
1208          * if we receive too few packets it is not considered bidirectional
1209          */
1210         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1211             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1212                 tq_own = 0;
1213         else
1214                 /* neigh_node->real_packet_count is never zero as we
1215                  * only purge old information when getting new
1216                  * information
1217                  */
1218                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1219
1220         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1221          * affect the nearly-symmetric links only a little, but
1222          * punishes asymmetric links more.  This will give a value
1223          * between 0 and TQ_MAX_VALUE
1224          */
1225         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1226         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1227         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1228                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1229                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1230         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1231         inv_asym_penalty /= neigh_rq_max_cube;
1232         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1233
1234         /* penalize if the OGM is forwarded on the same interface. WiFi
1235          * interfaces and other half duplex devices suffer from throughput
1236          * drops as they can't send and receive at the same time.
1237          */
1238         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1239         if (if_outgoing && (if_incoming == if_outgoing) &&
1240             batadv_is_wifi_netdev(if_outgoing->net_dev))
1241                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1242                                                       bat_priv);
1243
1244         combined_tq = batadv_ogm_packet->tq *
1245                       tq_own *
1246                       tq_asym_penalty *
1247                       tq_iface_penalty;
1248         combined_tq /= BATADV_TQ_MAX_VALUE *
1249                        BATADV_TQ_MAX_VALUE *
1250                        BATADV_TQ_MAX_VALUE;
1251         batadv_ogm_packet->tq = combined_tq;
1252
1253         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1254                    "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n",
1255                    orig_node->orig, orig_neigh_node->orig, total_count,
1256                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1257                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1258                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1259
1260         /* if link has the minimum required transmission quality
1261          * consider it bidirectional
1262          */
1263         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1264                 ret = 1;
1265
1266 out:
1267         if (neigh_node)
1268                 batadv_neigh_node_put(neigh_node);
1269         return ret;
1270 }
1271
1272 /**
1273  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1274  *  adjust the sequence number and find out whether it is a duplicate
1275  * @ethhdr: ethernet header of the packet
1276  * @batadv_ogm_packet: OGM packet to be considered
1277  * @if_incoming: interface on which the OGM packet was received
1278  * @if_outgoing: interface for which the retransmission should be considered
1279  *
1280  * Return: duplicate status as enum batadv_dup_status
1281  */
1282 static enum batadv_dup_status
1283 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1284                             const struct batadv_ogm_packet *batadv_ogm_packet,
1285                             const struct batadv_hard_iface *if_incoming,
1286                             struct batadv_hard_iface *if_outgoing)
1287 {
1288         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1289         struct batadv_orig_node *orig_node;
1290         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1291         struct batadv_neigh_node *neigh_node;
1292         struct batadv_neigh_ifinfo *neigh_ifinfo;
1293         int is_dup;
1294         s32 seq_diff;
1295         int need_update = 0;
1296         int set_mark;
1297         enum batadv_dup_status ret = BATADV_NO_DUP;
1298         u32 seqno = ntohl(batadv_ogm_packet->seqno);
1299         u8 *neigh_addr;
1300         u8 packet_count;
1301         unsigned long *bitmap;
1302
1303         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1304         if (!orig_node)
1305                 return BATADV_NO_DUP;
1306
1307         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1308         if (WARN_ON(!orig_ifinfo)) {
1309                 batadv_orig_node_put(orig_node);
1310                 return 0;
1311         }
1312
1313         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1314         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1315
1316         /* signalize caller that the packet is to be dropped. */
1317         if (!hlist_empty(&orig_node->neigh_list) &&
1318             batadv_window_protected(bat_priv, seq_diff,
1319                                     BATADV_TQ_LOCAL_WINDOW_SIZE,
1320                                     &orig_ifinfo->batman_seqno_reset, NULL)) {
1321                 ret = BATADV_PROTECTED;
1322                 goto out;
1323         }
1324
1325         rcu_read_lock();
1326         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1327                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1328                                                        if_outgoing);
1329                 if (!neigh_ifinfo)
1330                         continue;
1331
1332                 neigh_addr = neigh_node->addr;
1333                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1334                                          orig_ifinfo->last_real_seqno,
1335                                          seqno);
1336
1337                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1338                     neigh_node->if_incoming == if_incoming) {
1339                         set_mark = 1;
1340                         if (is_dup)
1341                                 ret = BATADV_NEIGH_DUP;
1342                 } else {
1343                         set_mark = 0;
1344                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1345                                 ret = BATADV_ORIG_DUP;
1346                 }
1347
1348                 /* if the window moved, set the update flag. */
1349                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1350                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1351                                                      seq_diff, set_mark);
1352
1353                 packet_count = bitmap_weight(bitmap,
1354                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1355                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1356                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1357         }
1358         rcu_read_unlock();
1359
1360         if (need_update) {
1361                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1362                            "%s updating last_seqno: old %u, new %u\n",
1363                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1364                            orig_ifinfo->last_real_seqno, seqno);
1365                 orig_ifinfo->last_real_seqno = seqno;
1366         }
1367
1368 out:
1369         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1370         batadv_orig_node_put(orig_node);
1371         batadv_orig_ifinfo_put(orig_ifinfo);
1372         return ret;
1373 }
1374
1375 /**
1376  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1377  * @skb: the skb containing the OGM
1378  * @ogm_offset: offset from skb->data to start of ogm header
1379  * @orig_node: the (cached) orig node for the originator of this OGM
1380  * @if_incoming: the interface where this packet was received
1381  * @if_outgoing: the interface for which the packet should be considered
1382  */
1383 static void
1384 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1385                                 struct batadv_orig_node *orig_node,
1386                                 struct batadv_hard_iface *if_incoming,
1387                                 struct batadv_hard_iface *if_outgoing)
1388 {
1389         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1390         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
1391         struct batadv_neigh_node *router = NULL;
1392         struct batadv_neigh_node *router_router = NULL;
1393         struct batadv_orig_node *orig_neigh_node;
1394         struct batadv_orig_ifinfo *orig_ifinfo;
1395         struct batadv_neigh_node *orig_neigh_router = NULL;
1396         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1397         struct batadv_ogm_packet *ogm_packet;
1398         enum batadv_dup_status dup_status;
1399         bool is_from_best_next_hop = false;
1400         bool is_single_hop_neigh = false;
1401         bool sameseq, similar_ttl;
1402         struct sk_buff *skb_priv;
1403         struct ethhdr *ethhdr;
1404         u8 *prev_sender;
1405         int is_bidirect;
1406
1407         /* create a private copy of the skb, as some functions change tq value
1408          * and/or flags.
1409          */
1410         skb_priv = skb_copy(skb, GFP_ATOMIC);
1411         if (!skb_priv)
1412                 return;
1413
1414         ethhdr = eth_hdr(skb_priv);
1415         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1416
1417         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1418                                                  if_incoming, if_outgoing);
1419         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1420                 is_single_hop_neigh = true;
1421
1422         if (dup_status == BATADV_PROTECTED) {
1423                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1424                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1425                            ethhdr->h_source);
1426                 goto out;
1427         }
1428
1429         if (ogm_packet->tq == 0) {
1430                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1431                            "Drop packet: originator packet with tq equal 0\n");
1432                 goto out;
1433         }
1434
1435         if (is_single_hop_neigh) {
1436                 hardif_neigh = batadv_hardif_neigh_get(if_incoming,
1437                                                        ethhdr->h_source);
1438                 if (hardif_neigh)
1439                         hardif_neigh->last_seen = jiffies;
1440         }
1441
1442         router = batadv_orig_router_get(orig_node, if_outgoing);
1443         if (router) {
1444                 router_router = batadv_orig_router_get(router->orig_node,
1445                                                        if_outgoing);
1446                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1447         }
1448
1449         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1450             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1451                 is_from_best_next_hop = true;
1452
1453         prev_sender = ogm_packet->prev_sender;
1454         /* avoid temporary routing loops */
1455         if (router && router_router &&
1456             (batadv_compare_eth(router->addr, prev_sender)) &&
1457             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1458             (batadv_compare_eth(router->addr, router_router->addr))) {
1459                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1460                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1461                            ethhdr->h_source);
1462                 goto out;
1463         }
1464
1465         if (if_outgoing == BATADV_IF_DEFAULT)
1466                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1467
1468         /* if sender is a direct neighbor the sender mac equals
1469          * originator mac
1470          */
1471         if (is_single_hop_neigh)
1472                 orig_neigh_node = orig_node;
1473         else
1474                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1475                                                          ethhdr->h_source);
1476
1477         if (!orig_neigh_node)
1478                 goto out;
1479
1480         /* Update nc_nodes of the originator */
1481         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1482                                  ogm_packet, is_single_hop_neigh);
1483
1484         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1485                                                    if_outgoing);
1486
1487         /* drop packet if sender is not a direct neighbor and if we
1488          * don't route towards it
1489          */
1490         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1491                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1492                            "Drop packet: OGM via unknown neighbor!\n");
1493                 goto out_neigh;
1494         }
1495
1496         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1497                                             ogm_packet, if_incoming,
1498                                             if_outgoing);
1499
1500         /* update ranking if it is not a duplicate or has the same
1501          * seqno and similar ttl as the non-duplicate
1502          */
1503         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1504         if (!orig_ifinfo)
1505                 goto out_neigh;
1506
1507         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1508         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1509
1510         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1511                             (sameseq && similar_ttl))) {
1512                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1513                                           orig_ifinfo, ethhdr,
1514                                           ogm_packet, if_incoming,
1515                                           if_outgoing, dup_status);
1516         }
1517         batadv_orig_ifinfo_put(orig_ifinfo);
1518
1519         /* only forward for specific interface, not for the default one. */
1520         if (if_outgoing == BATADV_IF_DEFAULT)
1521                 goto out_neigh;
1522
1523         /* is single hop (direct) neighbor */
1524         if (is_single_hop_neigh) {
1525                 /* OGMs from secondary interfaces should only scheduled once
1526                  * per interface where it has been received, not multiple times
1527                  */
1528                 if ((ogm_packet->ttl <= 2) &&
1529                     (if_incoming != if_outgoing)) {
1530                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1531                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1532                         goto out_neigh;
1533                 }
1534                 /* mark direct link on incoming interface */
1535                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1536                                       is_single_hop_neigh,
1537                                       is_from_best_next_hop, if_incoming,
1538                                       if_outgoing);
1539
1540                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1541                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1542                 goto out_neigh;
1543         }
1544
1545         /* multihop originator */
1546         if (!is_bidirect) {
1547                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1548                            "Drop packet: not received via bidirectional link\n");
1549                 goto out_neigh;
1550         }
1551
1552         if (dup_status == BATADV_NEIGH_DUP) {
1553                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1554                            "Drop packet: duplicate packet received\n");
1555                 goto out_neigh;
1556         }
1557
1558         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1559                    "Forwarding packet: rebroadcast originator packet\n");
1560         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1561                               is_single_hop_neigh, is_from_best_next_hop,
1562                               if_incoming, if_outgoing);
1563
1564 out_neigh:
1565         if ((orig_neigh_node) && (!is_single_hop_neigh))
1566                 batadv_orig_node_put(orig_neigh_node);
1567 out:
1568         if (router_ifinfo)
1569                 batadv_neigh_ifinfo_put(router_ifinfo);
1570         if (router)
1571                 batadv_neigh_node_put(router);
1572         if (router_router)
1573                 batadv_neigh_node_put(router_router);
1574         if (orig_neigh_router)
1575                 batadv_neigh_node_put(orig_neigh_router);
1576         if (hardif_neigh)
1577                 batadv_hardif_neigh_put(hardif_neigh);
1578
1579         kfree_skb(skb_priv);
1580 }
1581
1582 /**
1583  * batadv_iv_ogm_process - process an incoming batman iv OGM
1584  * @skb: the skb containing the OGM
1585  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1586  * @if_incoming: the interface where this packet was receved
1587  */
1588 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1589                                   struct batadv_hard_iface *if_incoming)
1590 {
1591         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1592         struct batadv_orig_node *orig_neigh_node, *orig_node;
1593         struct batadv_hard_iface *hard_iface;
1594         struct batadv_ogm_packet *ogm_packet;
1595         u32 if_incoming_seqno;
1596         bool has_directlink_flag;
1597         struct ethhdr *ethhdr;
1598         bool is_my_oldorig = false;
1599         bool is_my_addr = false;
1600         bool is_my_orig = false;
1601
1602         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1603         ethhdr = eth_hdr(skb);
1604
1605         /* Silently drop when the batman packet is actually not a
1606          * correct packet.
1607          *
1608          * This might happen if a packet is padded (e.g. Ethernet has a
1609          * minimum frame length of 64 byte) and the aggregation interprets
1610          * it as an additional length.
1611          *
1612          * TODO: A more sane solution would be to have a bit in the
1613          * batadv_ogm_packet to detect whether the packet is the last
1614          * packet in an aggregation.  Here we expect that the padding
1615          * is always zero (or not 0x01)
1616          */
1617         if (ogm_packet->packet_type != BATADV_IV_OGM)
1618                 return;
1619
1620         /* could be changed by schedule_own_packet() */
1621         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1622
1623         if (ogm_packet->flags & BATADV_DIRECTLINK)
1624                 has_directlink_flag = true;
1625         else
1626                 has_directlink_flag = false;
1627
1628         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1629                    "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",
1630                    ethhdr->h_source, if_incoming->net_dev->name,
1631                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1632                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1633                    ogm_packet->tq, ogm_packet->ttl,
1634                    ogm_packet->version, has_directlink_flag);
1635
1636         rcu_read_lock();
1637         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1638                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1639                         continue;
1640
1641                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1642                         continue;
1643
1644                 if (batadv_compare_eth(ethhdr->h_source,
1645                                        hard_iface->net_dev->dev_addr))
1646                         is_my_addr = true;
1647
1648                 if (batadv_compare_eth(ogm_packet->orig,
1649                                        hard_iface->net_dev->dev_addr))
1650                         is_my_orig = true;
1651
1652                 if (batadv_compare_eth(ogm_packet->prev_sender,
1653                                        hard_iface->net_dev->dev_addr))
1654                         is_my_oldorig = true;
1655         }
1656         rcu_read_unlock();
1657
1658         if (is_my_addr) {
1659                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1660                            "Drop packet: received my own broadcast (sender: %pM)\n",
1661                            ethhdr->h_source);
1662                 return;
1663         }
1664
1665         if (is_my_orig) {
1666                 unsigned long *word;
1667                 int offset;
1668                 s32 bit_pos;
1669                 s16 if_num;
1670                 u8 *weight;
1671
1672                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1673                                                          ethhdr->h_source);
1674                 if (!orig_neigh_node)
1675                         return;
1676
1677                 /* neighbor has to indicate direct link and it has to
1678                  * come via the corresponding interface
1679                  * save packet seqno for bidirectional check
1680                  */
1681                 if (has_directlink_flag &&
1682                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1683                                        ogm_packet->orig)) {
1684                         if_num = if_incoming->if_num;
1685                         offset = if_num * BATADV_NUM_WORDS;
1686
1687                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1688                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1689                         bit_pos = if_incoming_seqno - 2;
1690                         bit_pos -= ntohl(ogm_packet->seqno);
1691                         batadv_set_bit(word, bit_pos);
1692                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1693                         *weight = bitmap_weight(word,
1694                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1695                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1696                 }
1697
1698                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1699                            "Drop packet: originator packet from myself (via neighbor)\n");
1700                 batadv_orig_node_put(orig_neigh_node);
1701                 return;
1702         }
1703
1704         if (is_my_oldorig) {
1705                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1706                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1707                            ethhdr->h_source);
1708                 return;
1709         }
1710
1711         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1712                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1713                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1714                            ethhdr->h_source);
1715                 return;
1716         }
1717
1718         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1719         if (!orig_node)
1720                 return;
1721
1722         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1723                                         if_incoming, BATADV_IF_DEFAULT);
1724
1725         rcu_read_lock();
1726         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1727                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1728                         continue;
1729
1730                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1731                         continue;
1732
1733                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1734                                                 if_incoming, hard_iface);
1735         }
1736         rcu_read_unlock();
1737
1738         batadv_orig_node_put(orig_node);
1739 }
1740
1741 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1742                                  struct batadv_hard_iface *if_incoming)
1743 {
1744         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1745         struct batadv_ogm_packet *ogm_packet;
1746         u8 *packet_pos;
1747         int ogm_offset;
1748         bool ret;
1749
1750         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1751         if (!ret)
1752                 return NET_RX_DROP;
1753
1754         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1755          * that does not have B.A.T.M.A.N. IV enabled ?
1756          */
1757         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1758                 return NET_RX_DROP;
1759
1760         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1761         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1762                            skb->len + ETH_HLEN);
1763
1764         ogm_offset = 0;
1765         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1766
1767         /* unpack the aggregated packets and process them one by one */
1768         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1769                                          ogm_packet->tvlv_len)) {
1770                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1771
1772                 ogm_offset += BATADV_OGM_HLEN;
1773                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1774
1775                 packet_pos = skb->data + ogm_offset;
1776                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1777         }
1778
1779         kfree_skb(skb);
1780         return NET_RX_SUCCESS;
1781 }
1782
1783 /**
1784  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1785  * @orig_node: the orig_node for which the neighbors are printed
1786  * @if_outgoing: outgoing interface for these entries
1787  * @seq: debugfs table seq_file struct
1788  *
1789  * Must be called while holding an rcu lock.
1790  */
1791 static void
1792 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1793                                struct batadv_hard_iface *if_outgoing,
1794                                struct seq_file *seq)
1795 {
1796         struct batadv_neigh_node *neigh_node;
1797         struct batadv_neigh_ifinfo *n_ifinfo;
1798
1799         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1800                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1801                 if (!n_ifinfo)
1802                         continue;
1803
1804                 seq_printf(seq, " %pM (%3i)",
1805                            neigh_node->addr,
1806                            n_ifinfo->bat_iv.tq_avg);
1807
1808                 batadv_neigh_ifinfo_put(n_ifinfo);
1809         }
1810 }
1811
1812 /**
1813  * batadv_iv_ogm_orig_print - print the originator table
1814  * @bat_priv: the bat priv with all the soft interface information
1815  * @seq: debugfs table seq_file struct
1816  * @if_outgoing: the outgoing interface for which this should be printed
1817  */
1818 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1819                                      struct seq_file *seq,
1820                                      struct batadv_hard_iface *if_outgoing)
1821 {
1822         struct batadv_neigh_node *neigh_node;
1823         struct batadv_hashtable *hash = bat_priv->orig_hash;
1824         int last_seen_msecs, last_seen_secs;
1825         struct batadv_orig_node *orig_node;
1826         struct batadv_neigh_ifinfo *n_ifinfo;
1827         unsigned long last_seen_jiffies;
1828         struct hlist_head *head;
1829         int batman_count = 0;
1830         u32 i;
1831
1832         seq_printf(seq, "  %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1833                    "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1834                    "Nexthop", "outgoingIF", "Potential nexthops");
1835
1836         for (i = 0; i < hash->size; i++) {
1837                 head = &hash->table[i];
1838
1839                 rcu_read_lock();
1840                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1841                         neigh_node = batadv_orig_router_get(orig_node,
1842                                                             if_outgoing);
1843                         if (!neigh_node)
1844                                 continue;
1845
1846                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1847                                                            if_outgoing);
1848                         if (!n_ifinfo)
1849                                 goto next;
1850
1851                         if (n_ifinfo->bat_iv.tq_avg == 0)
1852                                 goto next;
1853
1854                         last_seen_jiffies = jiffies - orig_node->last_seen;
1855                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1856                         last_seen_secs = last_seen_msecs / 1000;
1857                         last_seen_msecs = last_seen_msecs % 1000;
1858
1859                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1860                                    orig_node->orig, last_seen_secs,
1861                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1862                                    neigh_node->addr,
1863                                    neigh_node->if_incoming->net_dev->name);
1864
1865                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1866                                                        seq);
1867                         seq_puts(seq, "\n");
1868                         batman_count++;
1869
1870 next:
1871                         batadv_neigh_node_put(neigh_node);
1872                         if (n_ifinfo)
1873                                 batadv_neigh_ifinfo_put(n_ifinfo);
1874                 }
1875                 rcu_read_unlock();
1876         }
1877
1878         if (batman_count == 0)
1879                 seq_puts(seq, "No batman nodes in range ...\n");
1880 }
1881
1882 /**
1883  * batadv_iv_hardif_neigh_print - print a single hop neighbour node
1884  * @seq: neighbour table seq_file struct
1885  * @hardif_neigh: hardif neighbour information
1886  */
1887 static void
1888 batadv_iv_hardif_neigh_print(struct seq_file *seq,
1889                              struct batadv_hardif_neigh_node *hardif_neigh)
1890 {
1891         int last_secs, last_msecs;
1892
1893         last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
1894         last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
1895
1896         seq_printf(seq, "   %10s   %pM %4i.%03is\n",
1897                    hardif_neigh->if_incoming->net_dev->name,
1898                    hardif_neigh->addr, last_secs, last_msecs);
1899 }
1900
1901 /**
1902  * batadv_iv_ogm_neigh_print - print the single hop neighbour list
1903  * @bat_priv: the bat priv with all the soft interface information
1904  * @seq: neighbour table seq_file struct
1905  */
1906 static void batadv_iv_neigh_print(struct batadv_priv *bat_priv,
1907                                   struct seq_file *seq)
1908 {
1909         struct net_device *net_dev = (struct net_device *)seq->private;
1910         struct batadv_hardif_neigh_node *hardif_neigh;
1911         struct batadv_hard_iface *hard_iface;
1912         int batman_count = 0;
1913
1914         seq_printf(seq, "   %10s        %-13s %s\n",
1915                    "IF", "Neighbor", "last-seen");
1916
1917         rcu_read_lock();
1918         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1919                 if (hard_iface->soft_iface != net_dev)
1920                         continue;
1921
1922                 hlist_for_each_entry_rcu(hardif_neigh,
1923                                          &hard_iface->neigh_list, list) {
1924                         batadv_iv_hardif_neigh_print(seq, hardif_neigh);
1925                         batman_count++;
1926                 }
1927         }
1928         rcu_read_unlock();
1929
1930         if (batman_count == 0)
1931                 seq_puts(seq, "No batman nodes in range ...\n");
1932 }
1933
1934 /**
1935  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1936  * @neigh1: the first neighbor object of the comparison
1937  * @if_outgoing1: outgoing interface for the first neighbor
1938  * @neigh2: the second neighbor object of the comparison
1939  * @if_outgoing2: outgoing interface for the second neighbor
1940  *
1941  * Return: a value less, equal to or greater than 0 if the metric via neigh1 is
1942  * lower, the same as or higher than the metric via neigh2
1943  */
1944 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1945                                    struct batadv_hard_iface *if_outgoing1,
1946                                    struct batadv_neigh_node *neigh2,
1947                                    struct batadv_hard_iface *if_outgoing2)
1948 {
1949         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1950         u8 tq1, tq2;
1951         int diff;
1952
1953         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1954         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1955
1956         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1957                 diff = 0;
1958                 goto out;
1959         }
1960
1961         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1962         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1963         diff = tq1 - tq2;
1964
1965 out:
1966         if (neigh1_ifinfo)
1967                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
1968         if (neigh2_ifinfo)
1969                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
1970
1971         return diff;
1972 }
1973
1974 /**
1975  * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better
1976  *  than neigh2 from the metric prospective
1977  * @neigh1: the first neighbor object of the comparison
1978  * @if_outgoing1: outgoing interface for the first neighbor
1979  * @neigh2: the second neighbor object of the comparison
1980  * @if_outgoing2: outgoing interface for the second neighbor
1981  *
1982  * Return: true if the metric via neigh1 is equally good or better than
1983  * the metric via neigh2, false otherwise.
1984  */
1985 static bool
1986 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1,
1987                            struct batadv_hard_iface *if_outgoing1,
1988                            struct batadv_neigh_node *neigh2,
1989                            struct batadv_hard_iface *if_outgoing2)
1990 {
1991         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1992         u8 tq1, tq2;
1993         bool ret;
1994
1995         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1996         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1997
1998         /* we can't say that the metric is better */
1999         if (!neigh1_ifinfo || !neigh2_ifinfo) {
2000                 ret = false;
2001                 goto out;
2002         }
2003
2004         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2005         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2006         ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
2007
2008 out:
2009         if (neigh1_ifinfo)
2010                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
2011         if (neigh2_ifinfo)
2012                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
2013
2014         return ret;
2015 }
2016
2017 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
2018         .name = "BATMAN_IV",
2019         .bat_iface_enable = batadv_iv_ogm_iface_enable,
2020         .bat_iface_disable = batadv_iv_ogm_iface_disable,
2021         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
2022         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
2023         .bat_ogm_schedule = batadv_iv_ogm_schedule,
2024         .bat_ogm_emit = batadv_iv_ogm_emit,
2025         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
2026         .bat_neigh_is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
2027         .bat_neigh_print = batadv_iv_neigh_print,
2028         .bat_orig_print = batadv_iv_ogm_orig_print,
2029         .bat_orig_free = batadv_iv_ogm_orig_free,
2030         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
2031         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
2032 };
2033
2034 int __init batadv_iv_init(void)
2035 {
2036         int ret;
2037
2038         /* batman originator packet */
2039         ret = batadv_recv_handler_register(BATADV_IV_OGM,
2040                                            batadv_iv_ogm_receive);
2041         if (ret < 0)
2042                 goto out;
2043
2044         ret = batadv_algo_register(&batadv_batman_iv);
2045         if (ret < 0)
2046                 goto handler_unregister;
2047
2048         goto out;
2049
2050 handler_unregister:
2051         batadv_recv_handler_unregister(BATADV_IV_OGM);
2052 out:
2053         return ret;
2054 }