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/lockdep.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/pkt_sched.h>
  38 #include <linux/printk.h>
  39 #include <linux/random.h>
  40 #include <linux/rculist.h>
  41 #include <linux/rcupdate.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/skbuff.h>
  44 #include <linux/slab.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/stddef.h>
  47 #include <linux/string.h>
  48 #include <linux/types.h>
  49 #include <linux/workqueue.h>
  50
  51 #include "bitarray.h"
  52 #include "hard-interface.h"
  53 #include "hash.h"
  54 #include "network-coding.h"
  55 #include "originator.h"
  56 #include "packet.h"
  57 #include "routing.h"
  58 #include "send.h"
  59 #include "translation-table.h"
  60
  61 /**
  62  * enum batadv_dup_status - duplicate status
  63  * @BATADV_NO_DUP: the packet is no duplicate
  64  * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
  65  *  neighbor)
  66  * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
  67  * @BATADV_PROTECTED: originator is currently protected (after reboot)
  68  */
  69 enum batadv_dup_status {
  70         BATADV_NO_DUP = 0,
  71         BATADV_ORIG_DUP,
  72         BATADV_NEIGH_DUP,
  73         BATADV_PROTECTED,
  74 };
  75
  76 /**
  77  * batadv_ring_buffer_set - update the ring buffer with the given value
  78  * @lq_recv: pointer to the ring buffer
  79  * @lq_index: index to store the value at
  80  * @value: value to store in the ring buffer
  81  */
  82 static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value)
  83 {
  84         lq_recv[*lq_index] = value;
  85         *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
  86 }
  87
  88 /**
  89  * batadv_ring_buffer_avg - compute the average of all non-zero values stored
  90  * in the given ring buffer
  91  * @lq_recv: pointer to the ring buffer
  92  *
  93  * Return: computed average value.
  94  */
  95 static u8 batadv_ring_buffer_avg(const u8 lq_recv[])
  96 {
  97         const u8 *ptr;
  98         u16 count = 0;
  99         u16 i = 0;
 100         u16 sum = 0;
 101
 102         ptr = lq_recv;
 103
 104         while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
 105                 if (*ptr != 0) {
 106                         count++;
 107                         sum += *ptr;
 108                 }
 109
 110                 i++;
 111                 ptr++;
 112         }
 113
 114         if (count == 0)
 115                 return 0;
 116
 117         return (u8)(sum / count);
 118 }
 119
 120 /**
 121  * batadv_iv_ogm_orig_free - free the private resources allocated for this
 122  *  orig_node
 123  * @orig_node: the orig_node for which the resources have to be free'd
 124  */
 125 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
 126 {
 127         kfree(orig_node->bat_iv.bcast_own);
 128         kfree(orig_node->bat_iv.bcast_own_sum);
 129 }
 130
 131 /**
 132  * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
 133  *  include the new hard-interface
 134  * @orig_node: the orig_node that has to be changed
 135  * @max_if_num: the current amount of interfaces
 136  *
 137  * Return: 0 on success, a negative error code otherwise.
 138  */
 139 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
 140                                      int max_if_num)
 141 {
 142         void *data_ptr;
 143         size_t old_size;
 144         int ret = -ENOMEM;
 145
 146         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 147
 148         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 149         data_ptr = kmalloc_array(max_if_num,
 150                                  BATADV_NUM_WORDS * sizeof(unsigned long),
 151                                  GFP_ATOMIC);
 152         if (!data_ptr)
 153                 goto unlock;
 154
 155         memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
 156         kfree(orig_node->bat_iv.bcast_own);
 157         orig_node->bat_iv.bcast_own = data_ptr;
 158
 159         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 160         if (!data_ptr) {
 161                 kfree(orig_node->bat_iv.bcast_own);
 162                 goto unlock;
 163         }
 164
 165         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 166                (max_if_num - 1) * sizeof(u8));
 167         kfree(orig_node->bat_iv.bcast_own_sum);
 168         orig_node->bat_iv.bcast_own_sum = data_ptr;
 169
 170         ret = 0;
 171
 172 unlock:
 173         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 174
 175         return ret;
 176 }
 177
 178 /**
 179  * batadv_iv_ogm_drop_bcast_own_entry - drop section of bcast_own
 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 static void
 185 batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node,
 186                                    int max_if_num, int del_if_num)
 187 {
 188         size_t chunk_size;
 189         size_t if_offset;
 190         void *data_ptr;
 191
 192         lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);
 193
 194         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 195         data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
 196         if (!data_ptr)
 197                 /* use old buffer when new one could not be allocated */
 198                 data_ptr = orig_node->bat_iv.bcast_own;
 199
 200         /* copy first part */
 201         memmove(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
 202
 203         /* copy second part */
 204         if_offset = (del_if_num + 1) * chunk_size;
 205         memmove((char *)data_ptr + del_if_num * chunk_size,
 206                 (uint8_t *)orig_node->bat_iv.bcast_own + if_offset,
 207                 (max_if_num - del_if_num) * chunk_size);
 208
 209         /* bcast_own was shrunk down in new buffer; free old one */
 210         if (orig_node->bat_iv.bcast_own != data_ptr) {
 211                 kfree(orig_node->bat_iv.bcast_own);
 212                 orig_node->bat_iv.bcast_own = data_ptr;
 213         }
 214 }
 215
 216 /**
 217  * batadv_iv_ogm_drop_bcast_own_sum_entry - drop section of bcast_own_sum
 218  * @orig_node: the orig_node that has to be changed
 219  * @max_if_num: the current amount of interfaces
 220  * @del_if_num: the index of the interface being removed
 221  */
 222 static void
 223 batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node,
 224                                        int max_if_num, int del_if_num)
 225 {
 226         size_t if_offset;
 227         void *data_ptr;
 228
 229         lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);
 230
 231         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 232         if (!data_ptr)
 233                 /* use old buffer when new one could not be allocated */
 234                 data_ptr = orig_node->bat_iv.bcast_own_sum;
 235
 236         memmove(data_ptr, orig_node->bat_iv.bcast_own_sum,
 237                 del_if_num * sizeof(u8));
 238
 239         if_offset = (del_if_num + 1) * sizeof(u8);
 240         memmove((char *)data_ptr + del_if_num * sizeof(u8),
 241                 orig_node->bat_iv.bcast_own_sum + if_offset,
 242                 (max_if_num - del_if_num) * sizeof(u8));
 243
 244         /* bcast_own_sum was shrunk down in new buffer; free old one */
 245         if (orig_node->bat_iv.bcast_own_sum != data_ptr) {
 246                 kfree(orig_node->bat_iv.bcast_own_sum);
 247                 orig_node->bat_iv.bcast_own_sum = data_ptr;
 248         }
 249 }
 250
 251 /**
 252  * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
 253  *  exclude the removed interface
 254  * @orig_node: the orig_node that has to be changed
 255  * @max_if_num: the current amount of interfaces
 256  * @del_if_num: the index of the interface being removed
 257  *
 258  * Return: 0 on success, a negative error code otherwise.
 259  */
 260 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
 261                                      int max_if_num, int del_if_num)
 262 {
 263         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 264
 265         if (max_if_num == 0) {
 266                 kfree(orig_node->bat_iv.bcast_own);
 267                 kfree(orig_node->bat_iv.bcast_own_sum);
 268                 orig_node->bat_iv.bcast_own = NULL;
 269                 orig_node->bat_iv.bcast_own_sum = NULL;
 270         } else {
 271                 batadv_iv_ogm_drop_bcast_own_entry(orig_node, max_if_num,
 272                                                    del_if_num);
 273                 batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node, max_if_num,
 274                                                        del_if_num);
 275         }
 276
 277         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 278
 279         return 0;
 280 }
 281
 282 /**
 283  * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
 284  * @bat_priv: the bat priv with all the soft interface information
 285  * @addr: mac address of the originator
 286  *
 287  * Return: the originator object corresponding to the passed mac address or NULL
 288  * on failure.
 289  * If the object does not exists it is created an initialised.
 290  */
 291 static struct batadv_orig_node *
 292 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr)
 293 {
 294         struct batadv_orig_node *orig_node;
 295         int size, hash_added;
 296
 297         orig_node = batadv_orig_hash_find(bat_priv, addr);
 298         if (orig_node)
 299                 return orig_node;
 300
 301         orig_node = batadv_orig_node_new(bat_priv, addr);
 302         if (!orig_node)
 303                 return NULL;
 304
 305         spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
 306
 307         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 308         orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
 309         if (!orig_node->bat_iv.bcast_own)
 310                 goto free_orig_node;
 311
 312         size = bat_priv->num_ifaces * sizeof(u8);
 313         orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 314         if (!orig_node->bat_iv.bcast_own_sum)
 315                 goto free_orig_node;
 316
 317         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 318                                      batadv_choose_orig, orig_node,
 319                                      &orig_node->hash_entry);
 320         if (hash_added != 0)
 321                 goto free_orig_node;
 322
 323         return orig_node;
 324
 325 free_orig_node:
 326         /* free twice, as batadv_orig_node_new sets refcount to 2 */
 327         batadv_orig_node_put(orig_node);
 328         batadv_orig_node_put(orig_node);
 329
 330         return NULL;
 331 }
 332
 333 static struct batadv_neigh_node *
 334 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
 335                         const u8 *neigh_addr,
 336                         struct batadv_orig_node *orig_node,
 337                         struct batadv_orig_node *orig_neigh)
 338 {
 339         struct batadv_neigh_node *neigh_node;
 340
 341         neigh_node = batadv_neigh_node_new(orig_node, hard_iface, neigh_addr);
 342         if (!neigh_node)
 343                 goto out;
 344
 345         neigh_node->orig_node = orig_neigh;
 346
 347 out:
 348         return neigh_node;
 349 }
 350
 351 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
 352 {
 353         struct batadv_ogm_packet *batadv_ogm_packet;
 354         unsigned char *ogm_buff;
 355         u32 random_seqno;
 356
 357         /* randomize initial seqno to avoid collision */
 358         get_random_bytes(&random_seqno, sizeof(random_seqno));
 359         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 360
 361         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 362         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 363         if (!ogm_buff)
 364                 return -ENOMEM;
 365
 366         hard_iface->bat_iv.ogm_buff = ogm_buff;
 367
 368         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 369         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 370         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 371         batadv_ogm_packet->ttl = 2;
 372         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 373         batadv_ogm_packet->reserved = 0;
 374         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 375
 376         return 0;
 377 }
 378
 379 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 380 {
 381         kfree(hard_iface->bat_iv.ogm_buff);
 382         hard_iface->bat_iv.ogm_buff = NULL;
 383 }
 384
 385 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 386 {
 387         struct batadv_ogm_packet *batadv_ogm_packet;
 388         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 389
 390         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 391         ether_addr_copy(batadv_ogm_packet->orig,
 392                         hard_iface->net_dev->dev_addr);
 393         ether_addr_copy(batadv_ogm_packet->prev_sender,
 394                         hard_iface->net_dev->dev_addr);
 395 }
 396
 397 static void
 398 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 399 {
 400         struct batadv_ogm_packet *batadv_ogm_packet;
 401         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 402
 403         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 404         batadv_ogm_packet->ttl = BATADV_TTL;
 405 }
 406
 407 /* when do we schedule our own ogm to be sent */
 408 static unsigned long
 409 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 410 {
 411         unsigned int msecs;
 412
 413         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 414         msecs += prandom_u32() % (2 * BATADV_JITTER);
 415
 416         return jiffies + msecs_to_jiffies(msecs);
 417 }
 418
 419 /* when do we schedule a ogm packet to be sent */
 420 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 421 {
 422         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 423 }
 424
 425 /* apply hop penalty for a normal link */
 426 static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv)
 427 {
 428         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 429         int new_tq;
 430
 431         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 432         new_tq /= BATADV_TQ_MAX_VALUE;
 433
 434         return new_tq;
 435 }
 436
 437 /**
 438  * batadv_iv_ogm_aggr_packet - checks if there is another OGM attached
 439  * @buff_pos: current position in the skb
 440  * @packet_len: total length of the skb
 441  * @tvlv_len: tvlv length of the previously considered OGM
 442  *
 443  * Return: true if there is enough space for another OGM, false otherwise.
 444  */
 445 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 446                                       __be16 tvlv_len)
 447 {
 448         int next_buff_pos = 0;
 449
 450         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 451         next_buff_pos += ntohs(tvlv_len);
 452
 453         return (next_buff_pos <= packet_len) &&
 454                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 455 }
 456
 457 /* send a batman ogm to a given interface */
 458 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 459                                      struct batadv_hard_iface *hard_iface)
 460 {
 461         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 462         const char *fwd_str;
 463         u8 packet_num;
 464         s16 buff_pos;
 465         struct batadv_ogm_packet *batadv_ogm_packet;
 466         struct sk_buff *skb;
 467         u8 *packet_pos;
 468
 469         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 470                 return;
 471
 472         packet_num = 0;
 473         buff_pos = 0;
 474         packet_pos = forw_packet->skb->data;
 475         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 476
 477         /* adjust all flags and log packets */
 478         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 479                                          batadv_ogm_packet->tvlv_len)) {
 480                 /* we might have aggregated direct link packets with an
 481                  * ordinary base packet
 482                  */
 483                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 484                     forw_packet->if_incoming == hard_iface)
 485                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 486                 else
 487                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 488
 489                 if (packet_num > 0 || !forw_packet->own)
 490                         fwd_str = "Forwarding";
 491                 else
 492                         fwd_str = "Sending own";
 493
 494                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 495                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 496                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 497                            batadv_ogm_packet->orig,
 498                            ntohl(batadv_ogm_packet->seqno),
 499                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 500                            ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ?
 501                             "on" : "off"),
 502                            hard_iface->net_dev->name,
 503                            hard_iface->net_dev->dev_addr);
 504
 505                 buff_pos += BATADV_OGM_HLEN;
 506                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 507                 packet_num++;
 508                 packet_pos = forw_packet->skb->data + buff_pos;
 509                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 510         }
 511
 512         /* create clone because function is called more than once */
 513         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 514         if (skb) {
 515                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 516                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 517                                    skb->len + ETH_HLEN);
 518                 batadv_send_broadcast_skb(skb, hard_iface);
 519         }
 520 }
 521
 522 /* send a batman ogm packet */
 523 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 524 {
 525         struct net_device *soft_iface;
 526         struct batadv_priv *bat_priv;
 527         struct batadv_hard_iface *primary_if = NULL;
 528
 529         if (!forw_packet->if_incoming) {
 530                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 531                 goto out;
 532         }
 533
 534         soft_iface = forw_packet->if_incoming->soft_iface;
 535         bat_priv = netdev_priv(soft_iface);
 536
 537         if (WARN_ON(!forw_packet->if_outgoing))
 538                 goto out;
 539
 540         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 541                 goto out;
 542
 543         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 544                 goto out;
 545
 546         primary_if = batadv_primary_if_get_selected(bat_priv);
 547         if (!primary_if)
 548                 goto out;
 549
 550         /* only for one specific outgoing interface */
 551         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 552
 553 out:
 554         if (primary_if)
 555                 batadv_hardif_put(primary_if);
 556 }
 557
 558 /**
 559  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 560  *  existing forward packet
 561  * @new_bat_ogm_packet: OGM packet to be aggregated
 562  * @bat_priv: the bat priv with all the soft interface information
 563  * @packet_len: (total) length of the OGM
 564  * @send_time: timestamp (jiffies) when the packet is to be sent
 565  * @directlink: true if this is a direct link packet
 566  * @if_incoming: interface where the packet was received
 567  * @if_outgoing: interface for which the retransmission should be considered
 568  * @forw_packet: the forwarded packet which should be checked
 569  *
 570  * Return: true if new_packet can be aggregated with forw_packet
 571  */
 572 static bool
 573 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 574                             struct batadv_priv *bat_priv,
 575                             int packet_len, unsigned long send_time,
 576                             bool directlink,
 577                             const struct batadv_hard_iface *if_incoming,
 578                             const struct batadv_hard_iface *if_outgoing,
 579                             const struct batadv_forw_packet *forw_packet)
 580 {
 581         struct batadv_ogm_packet *batadv_ogm_packet;
 582         int aggregated_bytes = forw_packet->packet_len + packet_len;
 583         struct batadv_hard_iface *primary_if = NULL;
 584         bool res = false;
 585         unsigned long aggregation_end_time;
 586
 587         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 588         aggregation_end_time = send_time;
 589         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 590
 591         /* we can aggregate the current packet to this aggregated packet
 592          * if:
 593          *
 594          * - the send time is within our MAX_AGGREGATION_MS time
 595          * - the resulting packet wont be bigger than
 596          *   MAX_AGGREGATION_BYTES
 597          * otherwise aggregation is not possible
 598          */
 599         if (!time_before(send_time, forw_packet->send_time) ||
 600             !time_after_eq(aggregation_end_time, forw_packet->send_time))
 601                 return false;
 602
 603         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
 604                 return false;
 605
 606         /* packet is not leaving on the same interface. */
 607         if (forw_packet->if_outgoing != if_outgoing)
 608                 return false;
 609
 610         /* check aggregation compatibility
 611          * -> direct link packets are broadcasted on
 612          *    their interface only
 613          * -> aggregate packet if the current packet is
 614          *    a "global" packet as well as the base
 615          *    packet
 616          */
 617         primary_if = batadv_primary_if_get_selected(bat_priv);
 618         if (!primary_if)
 619                 return false;
 620
 621         /* packets without direct link flag and high TTL
 622          * are flooded through the net
 623          */
 624         if (!directlink &&
 625             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
 626             batadv_ogm_packet->ttl != 1 &&
 627
 628             /* own packets originating non-primary
 629              * interfaces leave only that interface
 630              */
 631             (!forw_packet->own ||
 632              forw_packet->if_incoming == primary_if)) {
 633                 res = true;
 634                 goto out;
 635         }
 636
 637         /* if the incoming packet is sent via this one
 638          * interface only - we still can aggregate
 639          */
 640         if (directlink &&
 641             new_bat_ogm_packet->ttl == 1 &&
 642             forw_packet->if_incoming == if_incoming &&
 643
 644             /* packets from direct neighbors or
 645              * own secondary interface packets
 646              * (= secondary interface packets in general)
 647              */
 648             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 649              (forw_packet->own &&
 650               forw_packet->if_incoming != primary_if))) {
 651                 res = true;
 652                 goto out;
 653         }
 654
 655 out:
 656         if (primary_if)
 657                 batadv_hardif_put(primary_if);
 658         return res;
 659 }
 660
 661 /**
 662  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
 663  *  packet to it.
 664  * @packet_buff: pointer to the OGM
 665  * @packet_len: (total) length of the OGM
 666  * @send_time: timestamp (jiffies) when the packet is to be sent
 667  * @direct_link: whether this OGM has direct link status
 668  * @if_incoming: interface where the packet was received
 669  * @if_outgoing: interface for which the retransmission should be considered
 670  * @own_packet: true if it is a self-generated ogm
 671  */
 672 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 673                                         int packet_len, unsigned long send_time,
 674                                         bool direct_link,
 675                                         struct batadv_hard_iface *if_incoming,
 676                                         struct batadv_hard_iface *if_outgoing,
 677                                         int own_packet)
 678 {
 679         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 680         struct batadv_forw_packet *forw_packet_aggr;
 681         unsigned char *skb_buff;
 682         unsigned int skb_size;
 683
 684         /* own packet should always be scheduled */
 685         if (!own_packet) {
 686                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 687                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 688                                    "batman packet queue full\n");
 689                         return;
 690                 }
 691         }
 692
 693         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 694         if (!forw_packet_aggr)
 695                 goto out_nomem;
 696
 697         if (atomic_read(&bat_priv->aggregated_ogms) &&
 698             packet_len < BATADV_MAX_AGGREGATION_BYTES)
 699                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 700         else
 701                 skb_size = packet_len;
 702
 703         skb_size += ETH_HLEN;
 704
 705         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 706         if (!forw_packet_aggr->skb)
 707                 goto out_free_forw_packet;
 708         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 709         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 710
 711         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 712         forw_packet_aggr->packet_len = packet_len;
 713         memcpy(skb_buff, packet_buff, packet_len);
 714
 715         kref_get(&if_incoming->refcount);
 716         kref_get(&if_outgoing->refcount);
 717         forw_packet_aggr->own = own_packet;
 718         forw_packet_aggr->if_incoming = if_incoming;
 719         forw_packet_aggr->if_outgoing = if_outgoing;
 720         forw_packet_aggr->num_packets = 0;
 721         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 722         forw_packet_aggr->send_time = send_time;
 723
 724         /* save packet direct link flag status */
 725         if (direct_link)
 726                 forw_packet_aggr->direct_link_flags |= 1;
 727
 728         /* add new packet to packet list */
 729         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 730         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 731         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 732
 733         /* start timer for this packet */
 734         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 735                           batadv_send_outstanding_bat_ogm_packet);
 736         queue_delayed_work(batadv_event_workqueue,
 737                            &forw_packet_aggr->delayed_work,
 738                            send_time - jiffies);
 739
 740         return;
 741 out_free_forw_packet:
 742         kfree(forw_packet_aggr);
 743 out_nomem:
 744         if (!own_packet)
 745                 atomic_inc(&bat_priv->batman_queue_left);
 746 }
 747
 748 /* aggregate a new packet into the existing ogm packet */
 749 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 750                                     const unsigned char *packet_buff,
 751                                     int packet_len, bool direct_link)
 752 {
 753         unsigned char *skb_buff;
 754         unsigned long new_direct_link_flag;
 755
 756         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 757         memcpy(skb_buff, packet_buff, packet_len);
 758         forw_packet_aggr->packet_len += packet_len;
 759         forw_packet_aggr->num_packets++;
 760
 761         /* save packet direct link flag status */
 762         if (direct_link) {
 763                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 764                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 765         }
 766 }
 767
 768 /**
 769  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 770  * @bat_priv: the bat priv with all the soft interface information
 771  * @packet_buff: pointer to the OGM
 772  * @packet_len: (total) length of the OGM
 773  * @if_incoming: interface where the packet was received
 774  * @if_outgoing: interface for which the retransmission should be considered
 775  * @own_packet: true if it is a self-generated ogm
 776  * @send_time: timestamp (jiffies) when the packet is to be sent
 777  */
 778 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 779                                     unsigned char *packet_buff,
 780                                     int packet_len,
 781                                     struct batadv_hard_iface *if_incoming,
 782                                     struct batadv_hard_iface *if_outgoing,
 783                                     int own_packet, unsigned long send_time)
 784 {
 785         /* _aggr -> pointer to the packet we want to aggregate with
 786          * _pos -> pointer to the position in the queue
 787          */
 788         struct batadv_forw_packet *forw_packet_aggr = NULL;
 789         struct batadv_forw_packet *forw_packet_pos = NULL;
 790         struct batadv_ogm_packet *batadv_ogm_packet;
 791         bool direct_link;
 792         unsigned long max_aggregation_jiffies;
 793
 794         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 795         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 796         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 797
 798         /* find position for the packet in the forward queue */
 799         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 800         /* own packets are not to be aggregated */
 801         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 802                 hlist_for_each_entry(forw_packet_pos,
 803                                      &bat_priv->forw_bat_list, list) {
 804                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 805                                                         bat_priv, packet_len,
 806                                                         send_time, direct_link,
 807                                                         if_incoming,
 808                                                         if_outgoing,
 809                                                         forw_packet_pos)) {
 810                                 forw_packet_aggr = forw_packet_pos;
 811                                 break;
 812                         }
 813                 }
 814         }
 815
 816         /* nothing to aggregate with - either aggregation disabled or no
 817          * suitable aggregation packet found
 818          */
 819         if (!forw_packet_aggr) {
 820                 /* the following section can run without the lock */
 821                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 822
 823                 /* if we could not aggregate this packet with one of the others
 824                  * we hold it back for a while, so that it might be aggregated
 825                  * later on
 826                  */
 827                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 828                         send_time += max_aggregation_jiffies;
 829
 830                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 831                                             send_time, direct_link,
 832                                             if_incoming, if_outgoing,
 833                                             own_packet);
 834         } else {
 835                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 836                                         packet_len, direct_link);
 837                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 838         }
 839 }
 840
 841 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 842                                   const struct ethhdr *ethhdr,
 843                                   struct batadv_ogm_packet *batadv_ogm_packet,
 844                                   bool is_single_hop_neigh,
 845                                   bool is_from_best_next_hop,
 846                                   struct batadv_hard_iface *if_incoming,
 847                                   struct batadv_hard_iface *if_outgoing)
 848 {
 849         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 850         u16 tvlv_len;
 851
 852         if (batadv_ogm_packet->ttl <= 1) {
 853                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 854                 return;
 855         }
 856
 857         if (!is_from_best_next_hop) {
 858                 /* Mark the forwarded packet when it is not coming from our
 859                  * best next hop. We still need to forward the packet for our
 860                  * neighbor link quality detection to work in case the packet
 861                  * originated from a single hop neighbor. Otherwise we can
 862                  * simply drop the ogm.
 863                  */
 864                 if (is_single_hop_neigh)
 865                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 866                 else
 867                         return;
 868         }
 869
 870         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 871
 872         batadv_ogm_packet->ttl--;
 873         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 874
 875         /* apply hop penalty */
 876         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 877                                                    bat_priv);
 878
 879         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 880                    "Forwarding packet: tq: %i, ttl: %i\n",
 881                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 882
 883         if (is_single_hop_neigh)
 884                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 885         else
 886                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 887
 888         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 889                                 BATADV_OGM_HLEN + tvlv_len,
 890                                 if_incoming, if_outgoing, 0,
 891                                 batadv_iv_ogm_fwd_send_time());
 892 }
 893
 894 /**
 895  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 896  * the given interface
 897  * @hard_iface: the interface for which the windows have to be shifted
 898  */
 899 static void
 900 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 901 {
 902         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 903         struct batadv_hashtable *hash = bat_priv->orig_hash;
 904         struct hlist_head *head;
 905         struct batadv_orig_node *orig_node;
 906         unsigned long *word;
 907         u32 i;
 908         size_t word_index;
 909         u8 *w;
 910         int if_num;
 911
 912         for (i = 0; i < hash->size; i++) {
 913                 head = &hash->table[i];
 914
 915                 rcu_read_lock();
 916                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 917                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 918                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 919                         word = &orig_node->bat_iv.bcast_own[word_index];
 920
 921                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 922                         if_num = hard_iface->if_num;
 923                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 924                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 925                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 926                 }
 927                 rcu_read_unlock();
 928         }
 929 }
 930
 931 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 932 {
 933         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 934         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 935         struct batadv_ogm_packet *batadv_ogm_packet;
 936         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 937         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 938         u32 seqno;
 939         u16 tvlv_len = 0;
 940         unsigned long send_time;
 941
 942         primary_if = batadv_primary_if_get_selected(bat_priv);
 943
 944         if (hard_iface == primary_if) {
 945                 /* tt changes have to be committed before the tvlv data is
 946                  * appended as it may alter the tt tvlv container
 947                  */
 948                 batadv_tt_local_commit_changes(bat_priv);
 949                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 950                                                             ogm_buff_len,
 951                                                             BATADV_OGM_HLEN);
 952         }
 953
 954         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 955         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 956
 957         /* change sequence number to network order */
 958         seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 959         batadv_ogm_packet->seqno = htonl(seqno);
 960         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 961
 962         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 963
 964         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 965
 966         if (hard_iface != primary_if) {
 967                 /* OGMs from secondary interfaces are only scheduled on their
 968                  * respective interfaces.
 969                  */
 970                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 971                                         hard_iface, hard_iface, 1, send_time);
 972                 goto out;
 973         }
 974
 975         /* OGMs from primary interfaces are scheduled on all
 976          * interfaces.
 977          */
 978         rcu_read_lock();
 979         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 980                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 981                         continue;
 982
 983                 if (!kref_get_unless_zero(&tmp_hard_iface->refcount))
 984                         continue;
 985
 986                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 987                                         *ogm_buff_len, hard_iface,
 988                                         tmp_hard_iface, 1, send_time);
 989
 990                 batadv_hardif_put(tmp_hard_iface);
 991         }
 992         rcu_read_unlock();
 993
 994 out:
 995         if (primary_if)
 996                 batadv_hardif_put(primary_if);
 997 }
 998
 999 /**
1000  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
1001  *  originator
1002  * @bat_priv: the bat priv with all the soft interface information
1003  * @orig_node: the orig node who originally emitted the ogm packet
1004  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
1005  * @ethhdr: Ethernet header of the OGM
1006  * @batadv_ogm_packet: the ogm packet
1007  * @if_incoming: interface where the packet was received
1008  * @if_outgoing: interface for which the retransmission should be considered
1009  * @dup_status: the duplicate status of this ogm packet.
1010  */
1011 static void
1012 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
1013                           struct batadv_orig_node *orig_node,
1014                           struct batadv_orig_ifinfo *orig_ifinfo,
1015                           const struct ethhdr *ethhdr,
1016                           const struct batadv_ogm_packet *batadv_ogm_packet,
1017                           struct batadv_hard_iface *if_incoming,
1018                           struct batadv_hard_iface *if_outgoing,
1019                           enum batadv_dup_status dup_status)
1020 {
1021         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
1022         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1023         struct batadv_neigh_node *neigh_node = NULL;
1024         struct batadv_neigh_node *tmp_neigh_node = NULL;
1025         struct batadv_neigh_node *router = NULL;
1026         struct batadv_orig_node *orig_node_tmp;
1027         int if_num;
1028         u8 sum_orig, sum_neigh;
1029         u8 *neigh_addr;
1030         u8 tq_avg;
1031
1032         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1033                    "update_originator(): Searching and updating originator entry of received packet\n");
1034
1035         rcu_read_lock();
1036         hlist_for_each_entry_rcu(tmp_neigh_node,
1037                                  &orig_node->neigh_list, list) {
1038                 neigh_addr = tmp_neigh_node->addr;
1039                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1040                     tmp_neigh_node->if_incoming == if_incoming &&
1041                     kref_get_unless_zero(&tmp_neigh_node->refcount)) {
1042                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1043                                 batadv_neigh_node_put(neigh_node);
1044                         neigh_node = tmp_neigh_node;
1045                         continue;
1046                 }
1047
1048                 if (dup_status != BATADV_NO_DUP)
1049                         continue;
1050
1051                 /* only update the entry for this outgoing interface */
1052                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1053                                                        if_outgoing);
1054                 if (!neigh_ifinfo)
1055                         continue;
1056
1057                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1058                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1059                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1060                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1061                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1062                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1063
1064                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1065                 neigh_ifinfo = NULL;
1066         }
1067
1068         if (!neigh_node) {
1069                 struct batadv_orig_node *orig_tmp;
1070
1071                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1072                 if (!orig_tmp)
1073                         goto unlock;
1074
1075                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1076                                                      ethhdr->h_source,
1077                                                      orig_node, orig_tmp);
1078
1079                 batadv_orig_node_put(orig_tmp);
1080                 if (!neigh_node)
1081                         goto unlock;
1082         } else {
1083                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1084                            "Updating existing last-hop neighbor of originator\n");
1085         }
1086
1087         rcu_read_unlock();
1088         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1089         if (!neigh_ifinfo)
1090                 goto out;
1091
1092         neigh_node->last_seen = jiffies;
1093
1094         spin_lock_bh(&neigh_node->ifinfo_lock);
1095         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1096                                &neigh_ifinfo->bat_iv.tq_index,
1097                                batadv_ogm_packet->tq);
1098         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1099         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1100         spin_unlock_bh(&neigh_node->ifinfo_lock);
1101
1102         if (dup_status == BATADV_NO_DUP) {
1103                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1104                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1105         }
1106
1107         /* if this neighbor already is our next hop there is nothing
1108          * to change
1109          */
1110         router = batadv_orig_router_get(orig_node, if_outgoing);
1111         if (router == neigh_node)
1112                 goto out;
1113
1114         if (router) {
1115                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1116                 if (!router_ifinfo)
1117                         goto out;
1118
1119                 /* if this neighbor does not offer a better TQ we won't
1120                  * consider it
1121                  */
1122                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1123                         goto out;
1124         }
1125
1126         /* if the TQ is the same and the link not more symmetric we
1127          * won't consider it either
1128          */
1129         if (router_ifinfo &&
1130             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1131                 orig_node_tmp = router->orig_node;
1132                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1133                 if_num = router->if_incoming->if_num;
1134                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1135                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1136
1137                 orig_node_tmp = neigh_node->orig_node;
1138                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1139                 if_num = neigh_node->if_incoming->if_num;
1140                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1141                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1142
1143                 if (sum_orig >= sum_neigh)
1144                         goto out;
1145         }
1146
1147         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1148         goto out;
1149
1150 unlock:
1151         rcu_read_unlock();
1152 out:
1153         if (neigh_node)
1154                 batadv_neigh_node_put(neigh_node);
1155         if (router)
1156                 batadv_neigh_node_put(router);
1157         if (neigh_ifinfo)
1158                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1159         if (router_ifinfo)
1160                 batadv_neigh_ifinfo_put(router_ifinfo);
1161 }
1162
1163 /**
1164  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1165  * @orig_node: the orig node who originally emitted the ogm packet
1166  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1167  * @batadv_ogm_packet: the ogm packet
1168  * @if_incoming: interface where the packet was received
1169  * @if_outgoing: interface for which the retransmission should be considered
1170  *
1171  * Return: true if the link can be considered bidirectional, false otherwise
1172  */
1173 static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1174                                   struct batadv_orig_node *orig_neigh_node,
1175                                   struct batadv_ogm_packet *batadv_ogm_packet,
1176                                   struct batadv_hard_iface *if_incoming,
1177                                   struct batadv_hard_iface *if_outgoing)
1178 {
1179         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1180         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1181         struct batadv_neigh_ifinfo *neigh_ifinfo;
1182         u8 total_count;
1183         u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1184         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1185         int tq_asym_penalty, inv_asym_penalty, if_num;
1186         unsigned int combined_tq;
1187         int tq_iface_penalty;
1188         bool ret = false;
1189
1190         /* find corresponding one hop neighbor */
1191         rcu_read_lock();
1192         hlist_for_each_entry_rcu(tmp_neigh_node,
1193                                  &orig_neigh_node->neigh_list, list) {
1194                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1195                                         orig_neigh_node->orig))
1196                         continue;
1197
1198                 if (tmp_neigh_node->if_incoming != if_incoming)
1199                         continue;
1200
1201                 if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
1202                         continue;
1203
1204                 neigh_node = tmp_neigh_node;
1205                 break;
1206         }
1207         rcu_read_unlock();
1208
1209         if (!neigh_node)
1210                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1211                                                      orig_neigh_node->orig,
1212                                                      orig_neigh_node,
1213                                                      orig_neigh_node);
1214
1215         if (!neigh_node)
1216                 goto out;
1217
1218         /* if orig_node is direct neighbor update neigh_node last_seen */
1219         if (orig_node == orig_neigh_node)
1220                 neigh_node->last_seen = jiffies;
1221
1222         orig_node->last_seen = jiffies;
1223
1224         /* find packet count of corresponding one hop neighbor */
1225         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1226         if_num = if_incoming->if_num;
1227         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1228         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1229         if (neigh_ifinfo) {
1230                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1231                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1232         } else {
1233                 neigh_rq_count = 0;
1234         }
1235         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1236
1237         /* pay attention to not get a value bigger than 100 % */
1238         if (orig_eq_count > neigh_rq_count)
1239                 total_count = neigh_rq_count;
1240         else
1241                 total_count = orig_eq_count;
1242
1243         /* if we have too few packets (too less data) we set tq_own to zero
1244          * if we receive too few packets it is not considered bidirectional
1245          */
1246         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1247             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1248                 tq_own = 0;
1249         else
1250                 /* neigh_node->real_packet_count is never zero as we
1251                  * only purge old information when getting new
1252                  * information
1253                  */
1254                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1255
1256         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1257          * affect the nearly-symmetric links only a little, but
1258          * punishes asymmetric links more.  This will give a value
1259          * between 0 and TQ_MAX_VALUE
1260          */
1261         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1262         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1263         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1264                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1265                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1266         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1267         inv_asym_penalty /= neigh_rq_max_cube;
1268         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1269
1270         /* penalize if the OGM is forwarded on the same interface. WiFi
1271          * interfaces and other half duplex devices suffer from throughput
1272          * drops as they can't send and receive at the same time.
1273          */
1274         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1275         if (if_outgoing && (if_incoming == if_outgoing) &&
1276             batadv_is_wifi_netdev(if_outgoing->net_dev))
1277                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1278                                                       bat_priv);
1279
1280         combined_tq = batadv_ogm_packet->tq *
1281                       tq_own *
1282                       tq_asym_penalty *
1283                       tq_iface_penalty;
1284         combined_tq /= BATADV_TQ_MAX_VALUE *
1285                        BATADV_TQ_MAX_VALUE *
1286                        BATADV_TQ_MAX_VALUE;
1287         batadv_ogm_packet->tq = combined_tq;
1288
1289         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1290                    "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",
1291                    orig_node->orig, orig_neigh_node->orig, total_count,
1292                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1293                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1294                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1295
1296         /* if link has the minimum required transmission quality
1297          * consider it bidirectional
1298          */
1299         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1300                 ret = true;
1301
1302 out:
1303         if (neigh_node)
1304                 batadv_neigh_node_put(neigh_node);
1305         return ret;
1306 }
1307
1308 /**
1309  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1310  *  adjust the sequence number and find out whether it is a duplicate
1311  * @ethhdr: ethernet header of the packet
1312  * @batadv_ogm_packet: OGM packet to be considered
1313  * @if_incoming: interface on which the OGM packet was received
1314  * @if_outgoing: interface for which the retransmission should be considered
1315  *
1316  * Return: duplicate status as enum batadv_dup_status
1317  */
1318 static enum batadv_dup_status
1319 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1320                             const struct batadv_ogm_packet *batadv_ogm_packet,
1321                             const struct batadv_hard_iface *if_incoming,
1322                             struct batadv_hard_iface *if_outgoing)
1323 {
1324         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1325         struct batadv_orig_node *orig_node;
1326         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1327         struct batadv_neigh_node *neigh_node;
1328         struct batadv_neigh_ifinfo *neigh_ifinfo;
1329         bool is_dup;
1330         s32 seq_diff;
1331         bool need_update = false;
1332         int set_mark;
1333         enum batadv_dup_status ret = BATADV_NO_DUP;
1334         u32 seqno = ntohl(batadv_ogm_packet->seqno);
1335         u8 *neigh_addr;
1336         u8 packet_count;
1337         unsigned long *bitmap;
1338
1339         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1340         if (!orig_node)
1341                 return BATADV_NO_DUP;
1342
1343         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1344         if (WARN_ON(!orig_ifinfo)) {
1345                 batadv_orig_node_put(orig_node);
1346                 return 0;
1347         }
1348
1349         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1350         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1351
1352         /* signalize caller that the packet is to be dropped. */
1353         if (!hlist_empty(&orig_node->neigh_list) &&
1354             batadv_window_protected(bat_priv, seq_diff,
1355                                     BATADV_TQ_LOCAL_WINDOW_SIZE,
1356                                     &orig_ifinfo->batman_seqno_reset, NULL)) {
1357                 ret = BATADV_PROTECTED;
1358                 goto out;
1359         }
1360
1361         rcu_read_lock();
1362         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1363                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1364                                                        if_outgoing);
1365                 if (!neigh_ifinfo)
1366                         continue;
1367
1368                 neigh_addr = neigh_node->addr;
1369                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1370                                          orig_ifinfo->last_real_seqno,
1371                                          seqno);
1372
1373                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1374                     neigh_node->if_incoming == if_incoming) {
1375                         set_mark = 1;
1376                         if (is_dup)
1377                                 ret = BATADV_NEIGH_DUP;
1378                 } else {
1379                         set_mark = 0;
1380                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1381                                 ret = BATADV_ORIG_DUP;
1382                 }
1383
1384                 /* if the window moved, set the update flag. */
1385                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1386                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1387                                                      seq_diff, set_mark);
1388
1389                 packet_count = bitmap_weight(bitmap,
1390                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1391                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1392                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1393         }
1394         rcu_read_unlock();
1395
1396         if (need_update) {
1397                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1398                            "%s updating last_seqno: old %u, new %u\n",
1399                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1400                            orig_ifinfo->last_real_seqno, seqno);
1401                 orig_ifinfo->last_real_seqno = seqno;
1402         }
1403
1404 out:
1405         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1406         batadv_orig_node_put(orig_node);
1407         batadv_orig_ifinfo_put(orig_ifinfo);
1408         return ret;
1409 }
1410
1411 /**
1412  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1413  * @skb: the skb containing the OGM
1414  * @ogm_offset: offset from skb->data to start of ogm header
1415  * @orig_node: the (cached) orig node for the originator of this OGM
1416  * @if_incoming: the interface where this packet was received
1417  * @if_outgoing: the interface for which the packet should be considered
1418  */
1419 static void
1420 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1421                                 struct batadv_orig_node *orig_node,
1422                                 struct batadv_hard_iface *if_incoming,
1423                                 struct batadv_hard_iface *if_outgoing)
1424 {
1425         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1426         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
1427         struct batadv_neigh_node *router = NULL;
1428         struct batadv_neigh_node *router_router = NULL;
1429         struct batadv_orig_node *orig_neigh_node;
1430         struct batadv_orig_ifinfo *orig_ifinfo;
1431         struct batadv_neigh_node *orig_neigh_router = NULL;
1432         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1433         struct batadv_ogm_packet *ogm_packet;
1434         enum batadv_dup_status dup_status;
1435         bool is_from_best_next_hop = false;
1436         bool is_single_hop_neigh = false;
1437         bool sameseq, similar_ttl;
1438         struct sk_buff *skb_priv;
1439         struct ethhdr *ethhdr;
1440         u8 *prev_sender;
1441         bool is_bidirect;
1442
1443         /* create a private copy of the skb, as some functions change tq value
1444          * and/or flags.
1445          */
1446         skb_priv = skb_copy(skb, GFP_ATOMIC);
1447         if (!skb_priv)
1448                 return;
1449
1450         ethhdr = eth_hdr(skb_priv);
1451         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1452
1453         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1454                                                  if_incoming, if_outgoing);
1455         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1456                 is_single_hop_neigh = true;
1457
1458         if (dup_status == BATADV_PROTECTED) {
1459                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1460                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1461                            ethhdr->h_source);
1462                 goto out;
1463         }
1464
1465         if (ogm_packet->tq == 0) {
1466                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1467                            "Drop packet: originator packet with tq equal 0\n");
1468                 goto out;
1469         }
1470
1471         if (is_single_hop_neigh) {
1472                 hardif_neigh = batadv_hardif_neigh_get(if_incoming,
1473                                                        ethhdr->h_source);
1474                 if (hardif_neigh)
1475                         hardif_neigh->last_seen = jiffies;
1476         }
1477
1478         router = batadv_orig_router_get(orig_node, if_outgoing);
1479         if (router) {
1480                 router_router = batadv_orig_router_get(router->orig_node,
1481                                                        if_outgoing);
1482                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1483         }
1484
1485         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1486             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1487                 is_from_best_next_hop = true;
1488
1489         prev_sender = ogm_packet->prev_sender;
1490         /* avoid temporary routing loops */
1491         if (router && router_router &&
1492             (batadv_compare_eth(router->addr, prev_sender)) &&
1493             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1494             (batadv_compare_eth(router->addr, router_router->addr))) {
1495                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1496                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1497                            ethhdr->h_source);
1498                 goto out;
1499         }
1500
1501         if (if_outgoing == BATADV_IF_DEFAULT)
1502                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1503
1504         /* if sender is a direct neighbor the sender mac equals
1505          * originator mac
1506          */
1507         if (is_single_hop_neigh)
1508                 orig_neigh_node = orig_node;
1509         else
1510                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1511                                                          ethhdr->h_source);
1512
1513         if (!orig_neigh_node)
1514                 goto out;
1515
1516         /* Update nc_nodes of the originator */
1517         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1518                                  ogm_packet, is_single_hop_neigh);
1519
1520         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1521                                                    if_outgoing);
1522
1523         /* drop packet if sender is not a direct neighbor and if we
1524          * don't route towards it
1525          */
1526         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1527                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1528                            "Drop packet: OGM via unknown neighbor!\n");
1529                 goto out_neigh;
1530         }
1531
1532         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1533                                             ogm_packet, if_incoming,
1534                                             if_outgoing);
1535
1536         /* update ranking if it is not a duplicate or has the same
1537          * seqno and similar ttl as the non-duplicate
1538          */
1539         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1540         if (!orig_ifinfo)
1541                 goto out_neigh;
1542
1543         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1544         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1545
1546         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1547                             (sameseq && similar_ttl))) {
1548                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1549                                           orig_ifinfo, ethhdr,
1550                                           ogm_packet, if_incoming,
1551                                           if_outgoing, dup_status);
1552         }
1553         batadv_orig_ifinfo_put(orig_ifinfo);
1554
1555         /* only forward for specific interface, not for the default one. */
1556         if (if_outgoing == BATADV_IF_DEFAULT)
1557                 goto out_neigh;
1558
1559         /* is single hop (direct) neighbor */
1560         if (is_single_hop_neigh) {
1561                 /* OGMs from secondary interfaces should only scheduled once
1562                  * per interface where it has been received, not multiple times
1563                  */
1564                 if ((ogm_packet->ttl <= 2) &&
1565                     (if_incoming != if_outgoing)) {
1566                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1567                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1568                         goto out_neigh;
1569                 }
1570                 /* mark direct link on incoming interface */
1571                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1572                                       is_single_hop_neigh,
1573                                       is_from_best_next_hop, if_incoming,
1574                                       if_outgoing);
1575
1576                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1577                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1578                 goto out_neigh;
1579         }
1580
1581         /* multihop originator */
1582         if (!is_bidirect) {
1583                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1584                            "Drop packet: not received via bidirectional link\n");
1585                 goto out_neigh;
1586         }
1587
1588         if (dup_status == BATADV_NEIGH_DUP) {
1589                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1590                            "Drop packet: duplicate packet received\n");
1591                 goto out_neigh;
1592         }
1593
1594         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1595                    "Forwarding packet: rebroadcast originator packet\n");
1596         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1597                               is_single_hop_neigh, is_from_best_next_hop,
1598                               if_incoming, if_outgoing);
1599
1600 out_neigh:
1601         if ((orig_neigh_node) && (!is_single_hop_neigh))
1602                 batadv_orig_node_put(orig_neigh_node);
1603 out:
1604         if (router_ifinfo)
1605                 batadv_neigh_ifinfo_put(router_ifinfo);
1606         if (router)
1607                 batadv_neigh_node_put(router);
1608         if (router_router)
1609                 batadv_neigh_node_put(router_router);
1610         if (orig_neigh_router)
1611                 batadv_neigh_node_put(orig_neigh_router);
1612         if (hardif_neigh)
1613                 batadv_hardif_neigh_put(hardif_neigh);
1614
1615         kfree_skb(skb_priv);
1616 }
1617
1618 /**
1619  * batadv_iv_ogm_process - process an incoming batman iv OGM
1620  * @skb: the skb containing the OGM
1621  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1622  * @if_incoming: the interface where this packet was receved
1623  */
1624 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1625                                   struct batadv_hard_iface *if_incoming)
1626 {
1627         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1628         struct batadv_orig_node *orig_neigh_node, *orig_node;
1629         struct batadv_hard_iface *hard_iface;
1630         struct batadv_ogm_packet *ogm_packet;
1631         u32 if_incoming_seqno;
1632         bool has_directlink_flag;
1633         struct ethhdr *ethhdr;
1634         bool is_my_oldorig = false;
1635         bool is_my_addr = false;
1636         bool is_my_orig = false;
1637
1638         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1639         ethhdr = eth_hdr(skb);
1640
1641         /* Silently drop when the batman packet is actually not a
1642          * correct packet.
1643          *
1644          * This might happen if a packet is padded (e.g. Ethernet has a
1645          * minimum frame length of 64 byte) and the aggregation interprets
1646          * it as an additional length.
1647          *
1648          * TODO: A more sane solution would be to have a bit in the
1649          * batadv_ogm_packet to detect whether the packet is the last
1650          * packet in an aggregation.  Here we expect that the padding
1651          * is always zero (or not 0x01)
1652          */
1653         if (ogm_packet->packet_type != BATADV_IV_OGM)
1654                 return;
1655
1656         /* could be changed by schedule_own_packet() */
1657         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1658
1659         if (ogm_packet->flags & BATADV_DIRECTLINK)
1660                 has_directlink_flag = true;
1661         else
1662                 has_directlink_flag = false;
1663
1664         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1665                    "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",
1666                    ethhdr->h_source, if_incoming->net_dev->name,
1667                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1668                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1669                    ogm_packet->tq, ogm_packet->ttl,
1670                    ogm_packet->version, has_directlink_flag);
1671
1672         rcu_read_lock();
1673         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1674                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1675                         continue;
1676
1677                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1678                         continue;
1679
1680                 if (batadv_compare_eth(ethhdr->h_source,
1681                                        hard_iface->net_dev->dev_addr))
1682                         is_my_addr = true;
1683
1684                 if (batadv_compare_eth(ogm_packet->orig,
1685                                        hard_iface->net_dev->dev_addr))
1686                         is_my_orig = true;
1687
1688                 if (batadv_compare_eth(ogm_packet->prev_sender,
1689                                        hard_iface->net_dev->dev_addr))
1690                         is_my_oldorig = true;
1691         }
1692         rcu_read_unlock();
1693
1694         if (is_my_addr) {
1695                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1696                            "Drop packet: received my own broadcast (sender: %pM)\n",
1697                            ethhdr->h_source);
1698                 return;
1699         }
1700
1701         if (is_my_orig) {
1702                 unsigned long *word;
1703                 int offset;
1704                 s32 bit_pos;
1705                 s16 if_num;
1706                 u8 *weight;
1707
1708                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1709                                                          ethhdr->h_source);
1710                 if (!orig_neigh_node)
1711                         return;
1712
1713                 /* neighbor has to indicate direct link and it has to
1714                  * come via the corresponding interface
1715                  * save packet seqno for bidirectional check
1716                  */
1717                 if (has_directlink_flag &&
1718                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1719                                        ogm_packet->orig)) {
1720                         if_num = if_incoming->if_num;
1721                         offset = if_num * BATADV_NUM_WORDS;
1722
1723                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1724                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1725                         bit_pos = if_incoming_seqno - 2;
1726                         bit_pos -= ntohl(ogm_packet->seqno);
1727                         batadv_set_bit(word, bit_pos);
1728                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1729                         *weight = bitmap_weight(word,
1730                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1731                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1732                 }
1733
1734                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1735                            "Drop packet: originator packet from myself (via neighbor)\n");
1736                 batadv_orig_node_put(orig_neigh_node);
1737                 return;
1738         }
1739
1740         if (is_my_oldorig) {
1741                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1742                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1743                            ethhdr->h_source);
1744                 return;
1745         }
1746
1747         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1748                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1749                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1750                            ethhdr->h_source);
1751                 return;
1752         }
1753
1754         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1755         if (!orig_node)
1756                 return;
1757
1758         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1759                                         if_incoming, BATADV_IF_DEFAULT);
1760
1761         rcu_read_lock();
1762         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1763                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1764                         continue;
1765
1766                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1767                         continue;
1768
1769                 if (!kref_get_unless_zero(&hard_iface->refcount))
1770                         continue;
1771
1772                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1773                                                 if_incoming, hard_iface);
1774
1775                 batadv_hardif_put(hard_iface);
1776         }
1777         rcu_read_unlock();
1778
1779         batadv_orig_node_put(orig_node);
1780 }
1781
1782 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1783                                  struct batadv_hard_iface *if_incoming)
1784 {
1785         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1786         struct batadv_ogm_packet *ogm_packet;
1787         u8 *packet_pos;
1788         int ogm_offset;
1789         bool ret;
1790
1791         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1792         if (!ret)
1793                 return NET_RX_DROP;
1794
1795         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1796          * that does not have B.A.T.M.A.N. IV enabled ?
1797          */
1798         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1799                 return NET_RX_DROP;
1800
1801         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1802         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1803                            skb->len + ETH_HLEN);
1804
1805         ogm_offset = 0;
1806         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1807
1808         /* unpack the aggregated packets and process them one by one */
1809         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1810                                          ogm_packet->tvlv_len)) {
1811                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1812
1813                 ogm_offset += BATADV_OGM_HLEN;
1814                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1815
1816                 packet_pos = skb->data + ogm_offset;
1817                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1818         }
1819
1820         kfree_skb(skb);
1821         return NET_RX_SUCCESS;
1822 }
1823
1824 /**
1825  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1826  * @orig_node: the orig_node for which the neighbors are printed
1827  * @if_outgoing: outgoing interface for these entries
1828  * @seq: debugfs table seq_file struct
1829  *
1830  * Must be called while holding an rcu lock.
1831  */
1832 static void
1833 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1834                                struct batadv_hard_iface *if_outgoing,
1835                                struct seq_file *seq)
1836 {
1837         struct batadv_neigh_node *neigh_node;
1838         struct batadv_neigh_ifinfo *n_ifinfo;
1839
1840         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1841                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1842                 if (!n_ifinfo)
1843                         continue;
1844
1845                 seq_printf(seq, " %pM (%3i)",
1846                            neigh_node->addr,
1847                            n_ifinfo->bat_iv.tq_avg);
1848
1849                 batadv_neigh_ifinfo_put(n_ifinfo);
1850         }
1851 }
1852
1853 /**
1854  * batadv_iv_ogm_orig_print - print the originator table
1855  * @bat_priv: the bat priv with all the soft interface information
1856  * @seq: debugfs table seq_file struct
1857  * @if_outgoing: the outgoing interface for which this should be printed
1858  */
1859 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1860                                      struct seq_file *seq,
1861                                      struct batadv_hard_iface *if_outgoing)
1862 {
1863         struct batadv_neigh_node *neigh_node;
1864         struct batadv_hashtable *hash = bat_priv->orig_hash;
1865         int last_seen_msecs, last_seen_secs;
1866         struct batadv_orig_node *orig_node;
1867         struct batadv_neigh_ifinfo *n_ifinfo;
1868         unsigned long last_seen_jiffies;
1869         struct hlist_head *head;
1870         int batman_count = 0;
1871         u32 i;
1872
1873         seq_puts(seq,
1874                  "  Originator      last-seen (#/255)           Nexthop [outgoingIF]:   Potential nexthops ...\n");
1875
1876         for (i = 0; i < hash->size; i++) {
1877                 head = &hash->table[i];
1878
1879                 rcu_read_lock();
1880                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1881                         neigh_node = batadv_orig_router_get(orig_node,
1882                                                             if_outgoing);
1883                         if (!neigh_node)
1884                                 continue;
1885
1886                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1887                                                            if_outgoing);
1888                         if (!n_ifinfo)
1889                                 goto next;
1890
1891                         if (n_ifinfo->bat_iv.tq_avg == 0)
1892                                 goto next;
1893
1894                         last_seen_jiffies = jiffies - orig_node->last_seen;
1895                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1896                         last_seen_secs = last_seen_msecs / 1000;
1897                         last_seen_msecs = last_seen_msecs % 1000;
1898
1899                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1900                                    orig_node->orig, last_seen_secs,
1901                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1902                                    neigh_node->addr,
1903                                    neigh_node->if_incoming->net_dev->name);
1904
1905                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1906                                                        seq);
1907                         seq_puts(seq, "\n");
1908                         batman_count++;
1909
1910 next:
1911                         batadv_neigh_node_put(neigh_node);
1912                         if (n_ifinfo)
1913                                 batadv_neigh_ifinfo_put(n_ifinfo);
1914                 }
1915                 rcu_read_unlock();
1916         }
1917
1918         if (batman_count == 0)
1919                 seq_puts(seq, "No batman nodes in range ...\n");
1920 }
1921
1922 /**
1923  * batadv_iv_hardif_neigh_print - print a single hop neighbour node
1924  * @seq: neighbour table seq_file struct
1925  * @hardif_neigh: hardif neighbour information
1926  */
1927 static void
1928 batadv_iv_hardif_neigh_print(struct seq_file *seq,
1929                              struct batadv_hardif_neigh_node *hardif_neigh)
1930 {
1931         int last_secs, last_msecs;
1932
1933         last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
1934         last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
1935
1936         seq_printf(seq, "   %10s   %pM %4i.%03is\n",
1937                    hardif_neigh->if_incoming->net_dev->name,
1938                    hardif_neigh->addr, last_secs, last_msecs);
1939 }
1940
1941 /**
1942  * batadv_iv_ogm_neigh_print - print the single hop neighbour list
1943  * @bat_priv: the bat priv with all the soft interface information
1944  * @seq: neighbour table seq_file struct
1945  */
1946 static void batadv_iv_neigh_print(struct batadv_priv *bat_priv,
1947                                   struct seq_file *seq)
1948 {
1949         struct net_device *net_dev = (struct net_device *)seq->private;
1950         struct batadv_hardif_neigh_node *hardif_neigh;
1951         struct batadv_hard_iface *hard_iface;
1952         int batman_count = 0;
1953
1954         seq_puts(seq, "           IF        Neighbor      last-seen\n");
1955
1956         rcu_read_lock();
1957         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1958                 if (hard_iface->soft_iface != net_dev)
1959                         continue;
1960
1961                 hlist_for_each_entry_rcu(hardif_neigh,
1962                                          &hard_iface->neigh_list, list) {
1963                         batadv_iv_hardif_neigh_print(seq, hardif_neigh);
1964                         batman_count++;
1965                 }
1966         }
1967         rcu_read_unlock();
1968
1969         if (batman_count == 0)
1970                 seq_puts(seq, "No batman nodes in range ...\n");
1971 }
1972
1973 /**
1974  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
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: a value less, equal to or greater than 0 if the metric via neigh1 is
1981  * lower, the same as or higher than the metric via neigh2
1982  */
1983 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1984                                    struct batadv_hard_iface *if_outgoing1,
1985                                    struct batadv_neigh_node *neigh2,
1986                                    struct batadv_hard_iface *if_outgoing2)
1987 {
1988         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1989         u8 tq1, tq2;
1990         int diff;
1991
1992         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1993         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1994
1995         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1996                 diff = 0;
1997                 goto out;
1998         }
1999
2000         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2001         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2002         diff = tq1 - tq2;
2003
2004 out:
2005         if (neigh1_ifinfo)
2006                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
2007         if (neigh2_ifinfo)
2008                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
2009
2010         return diff;
2011 }
2012
2013 /**
2014  * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better
2015  *  than neigh2 from the metric prospective
2016  * @neigh1: the first neighbor object of the comparison
2017  * @if_outgoing1: outgoing interface for the first neighbor
2018  * @neigh2: the second neighbor object of the comparison
2019  * @if_outgoing2: outgoing interface for the second neighbor
2020  *
2021  * Return: true if the metric via neigh1 is equally good or better than
2022  * the metric via neigh2, false otherwise.
2023  */
2024 static bool
2025 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1,
2026                            struct batadv_hard_iface *if_outgoing1,
2027                            struct batadv_neigh_node *neigh2,
2028                            struct batadv_hard_iface *if_outgoing2)
2029 {
2030         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
2031         u8 tq1, tq2;
2032         bool ret;
2033
2034         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
2035         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
2036
2037         /* we can't say that the metric is better */
2038         if (!neigh1_ifinfo || !neigh2_ifinfo) {
2039                 ret = false;
2040                 goto out;
2041         }
2042
2043         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2044         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2045         ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
2046
2047 out:
2048         if (neigh1_ifinfo)
2049                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
2050         if (neigh2_ifinfo)
2051                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
2052
2053         return ret;
2054 }
2055
2056 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
2057         .name = "BATMAN_IV",
2058         .bat_iface_enable = batadv_iv_ogm_iface_enable,
2059         .bat_iface_disable = batadv_iv_ogm_iface_disable,
2060         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
2061         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
2062         .bat_ogm_schedule = batadv_iv_ogm_schedule,
2063         .bat_ogm_emit = batadv_iv_ogm_emit,
2064         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
2065         .bat_neigh_is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
2066         .bat_neigh_print = batadv_iv_neigh_print,
2067         .bat_orig_print = batadv_iv_ogm_orig_print,
2068         .bat_orig_free = batadv_iv_ogm_orig_free,
2069         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
2070         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
2071 };
2072
2073 int __init batadv_iv_init(void)
2074 {
2075         int ret;
2076
2077         /* batman originator packet */
2078         ret = batadv_recv_handler_register(BATADV_IV_OGM,
2079                                            batadv_iv_ogm_receive);
2080         if (ret < 0)
2081                 goto out;
2082
2083         ret = batadv_algo_register(&batadv_batman_iv);
2084         if (ret < 0)
2085                 goto handler_unregister;
2086
2087         goto out;
2088
2089 handler_unregister:
2090         batadv_recv_handler_unregister(BATADV_IV_OGM);
2091 out:
2092         return ret;
2093 }