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