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                 goto unlock;
 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_drop_bcast_own_entry - drop section of bcast_own
 178  * @orig_node: the orig_node that has to be changed
 179  * @max_if_num: the current amount of interfaces
 180  * @del_if_num: the index of the interface being removed
 181  */
 182 static void
 183 batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node,
 184                                    int max_if_num, int del_if_num)
 185 {
 186         size_t chunk_size;
 187         size_t if_offset;
 188         void *data_ptr;
 189
 190         lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);
 191
 192         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 193         data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
 194         if (!data_ptr)
 195                 /* use old buffer when new one could not be allocated */
 196                 data_ptr = orig_node->bat_iv.bcast_own;
 197
 198         /* copy first part */
 199         memmove(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
 200
 201         /* copy second part */
 202         if_offset = (del_if_num + 1) * chunk_size;
 203         memmove((char *)data_ptr + del_if_num * chunk_size,
 204                 (uint8_t *)orig_node->bat_iv.bcast_own + if_offset,
 205                 (max_if_num - del_if_num) * chunk_size);
 206
 207         /* bcast_own was shrunk down in new buffer; free old one */
 208         if (orig_node->bat_iv.bcast_own != data_ptr) {
 209                 kfree(orig_node->bat_iv.bcast_own);
 210                 orig_node->bat_iv.bcast_own = data_ptr;
 211         }
 212 }
 213
 214 /**
 215  * batadv_iv_ogm_drop_bcast_own_sum_entry - drop section of bcast_own_sum
 216  * @orig_node: the orig_node that has to be changed
 217  * @max_if_num: the current amount of interfaces
 218  * @del_if_num: the index of the interface being removed
 219  */
 220 static void
 221 batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node,
 222                                        int max_if_num, int del_if_num)
 223 {
 224         size_t if_offset;
 225         void *data_ptr;
 226
 227         lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);
 228
 229         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 230         if (!data_ptr)
 231                 /* use old buffer when new one could not be allocated */
 232                 data_ptr = orig_node->bat_iv.bcast_own_sum;
 233
 234         memmove(data_ptr, orig_node->bat_iv.bcast_own_sum,
 235                 del_if_num * sizeof(u8));
 236
 237         if_offset = (del_if_num + 1) * sizeof(u8);
 238         memmove((char *)data_ptr + del_if_num * sizeof(u8),
 239                 orig_node->bat_iv.bcast_own_sum + if_offset,
 240                 (max_if_num - del_if_num) * sizeof(u8));
 241
 242         /* bcast_own_sum was shrunk down in new buffer; free old one */
 243         if (orig_node->bat_iv.bcast_own_sum != data_ptr) {
 244                 kfree(orig_node->bat_iv.bcast_own_sum);
 245                 orig_node->bat_iv.bcast_own_sum = data_ptr;
 246         }
 247 }
 248
 249 /**
 250  * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
 251  *  exclude the removed interface
 252  * @orig_node: the orig_node that has to be changed
 253  * @max_if_num: the current amount of interfaces
 254  * @del_if_num: the index of the interface being removed
 255  *
 256  * Return: 0 on success, a negative error code otherwise.
 257  */
 258 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
 259                                      int max_if_num, int del_if_num)
 260 {
 261         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 262
 263         if (max_if_num == 0) {
 264                 kfree(orig_node->bat_iv.bcast_own);
 265                 kfree(orig_node->bat_iv.bcast_own_sum);
 266                 orig_node->bat_iv.bcast_own = NULL;
 267                 orig_node->bat_iv.bcast_own_sum = NULL;
 268         } else {
 269                 batadv_iv_ogm_drop_bcast_own_entry(orig_node, max_if_num,
 270                                                    del_if_num);
 271                 batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node, max_if_num,
 272                                                        del_if_num);
 273         }
 274
 275         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 276
 277         return 0;
 278 }
 279
 280 /**
 281  * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
 282  * @bat_priv: the bat priv with all the soft interface information
 283  * @addr: mac address of the originator
 284  *
 285  * Return: the originator object corresponding to the passed mac address or NULL
 286  * on failure.
 287  * If the object does not exists it is created an initialised.
 288  */
 289 static struct batadv_orig_node *
 290 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr)
 291 {
 292         struct batadv_orig_node *orig_node;
 293         int size, hash_added;
 294
 295         orig_node = batadv_orig_hash_find(bat_priv, addr);
 296         if (orig_node)
 297                 return orig_node;
 298
 299         orig_node = batadv_orig_node_new(bat_priv, addr);
 300         if (!orig_node)
 301                 return NULL;
 302
 303         spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
 304
 305         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 306         orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
 307         if (!orig_node->bat_iv.bcast_own)
 308                 goto free_orig_node;
 309
 310         size = bat_priv->num_ifaces * sizeof(u8);
 311         orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 312         if (!orig_node->bat_iv.bcast_own_sum)
 313                 goto free_orig_node;
 314
 315         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 316                                      batadv_choose_orig, orig_node,
 317                                      &orig_node->hash_entry);
 318         if (hash_added != 0)
 319                 goto free_orig_node;
 320
 321         return orig_node;
 322
 323 free_orig_node:
 324         /* free twice, as batadv_orig_node_new sets refcount to 2 */
 325         batadv_orig_node_put(orig_node);
 326         batadv_orig_node_put(orig_node);
 327
 328         return NULL;
 329 }
 330
 331 static struct batadv_neigh_node *
 332 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
 333                         const u8 *neigh_addr,
 334                         struct batadv_orig_node *orig_node,
 335                         struct batadv_orig_node *orig_neigh)
 336 {
 337         struct batadv_neigh_node *neigh_node;
 338
 339         neigh_node = batadv_neigh_node_new(orig_node, hard_iface, neigh_addr);
 340         if (!neigh_node)
 341                 goto out;
 342
 343         neigh_node->orig_node = orig_neigh;
 344
 345 out:
 346         return neigh_node;
 347 }
 348
 349 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
 350 {
 351         struct batadv_ogm_packet *batadv_ogm_packet;
 352         unsigned char *ogm_buff;
 353         u32 random_seqno;
 354
 355         /* randomize initial seqno to avoid collision */
 356         get_random_bytes(&random_seqno, sizeof(random_seqno));
 357         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 358
 359         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 360         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 361         if (!ogm_buff)
 362                 return -ENOMEM;
 363
 364         hard_iface->bat_iv.ogm_buff = ogm_buff;
 365
 366         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 367         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 368         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 369         batadv_ogm_packet->ttl = 2;
 370         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 371         batadv_ogm_packet->reserved = 0;
 372         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 373
 374         return 0;
 375 }
 376
 377 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 378 {
 379         kfree(hard_iface->bat_iv.ogm_buff);
 380         hard_iface->bat_iv.ogm_buff = NULL;
 381 }
 382
 383 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 384 {
 385         struct batadv_ogm_packet *batadv_ogm_packet;
 386         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 387
 388         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 389         ether_addr_copy(batadv_ogm_packet->orig,
 390                         hard_iface->net_dev->dev_addr);
 391         ether_addr_copy(batadv_ogm_packet->prev_sender,
 392                         hard_iface->net_dev->dev_addr);
 393 }
 394
 395 static void
 396 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 397 {
 398         struct batadv_ogm_packet *batadv_ogm_packet;
 399         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 400
 401         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 402         batadv_ogm_packet->ttl = BATADV_TTL;
 403 }
 404
 405 /* when do we schedule our own ogm to be sent */
 406 static unsigned long
 407 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 408 {
 409         unsigned int msecs;
 410
 411         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 412         msecs += prandom_u32() % (2 * BATADV_JITTER);
 413
 414         return jiffies + msecs_to_jiffies(msecs);
 415 }
 416
 417 /* when do we schedule a ogm packet to be sent */
 418 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 419 {
 420         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 421 }
 422
 423 /* apply hop penalty for a normal link */
 424 static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv)
 425 {
 426         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 427         int new_tq;
 428
 429         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 430         new_tq /= BATADV_TQ_MAX_VALUE;
 431
 432         return new_tq;
 433 }
 434
 435 /**
 436  * batadv_iv_ogm_aggr_packet - checks if there is another OGM attached
 437  * @buff_pos: current position in the skb
 438  * @packet_len: total length of the skb
 439  * @tvlv_len: tvlv length of the previously considered OGM
 440  *
 441  * Return: true if there is enough space for another OGM, false otherwise.
 442  */
 443 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 444                                       __be16 tvlv_len)
 445 {
 446         int next_buff_pos = 0;
 447
 448         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 449         next_buff_pos += ntohs(tvlv_len);
 450
 451         return (next_buff_pos <= packet_len) &&
 452                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 453 }
 454
 455 /* send a batman ogm to a given interface */
 456 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 457                                      struct batadv_hard_iface *hard_iface)
 458 {
 459         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 460         const char *fwd_str;
 461         u8 packet_num;
 462         s16 buff_pos;
 463         struct batadv_ogm_packet *batadv_ogm_packet;
 464         struct sk_buff *skb;
 465         u8 *packet_pos;
 466
 467         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 468                 return;
 469
 470         packet_num = 0;
 471         buff_pos = 0;
 472         packet_pos = forw_packet->skb->data;
 473         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 474
 475         /* adjust all flags and log packets */
 476         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 477                                          batadv_ogm_packet->tvlv_len)) {
 478                 /* we might have aggregated direct link packets with an
 479                  * ordinary base packet
 480                  */
 481                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 482                     forw_packet->if_incoming == hard_iface)
 483                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 484                 else
 485                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 486
 487                 if (packet_num > 0 || !forw_packet->own)
 488                         fwd_str = "Forwarding";
 489                 else
 490                         fwd_str = "Sending own";
 491
 492                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 493                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 494                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 495                            batadv_ogm_packet->orig,
 496                            ntohl(batadv_ogm_packet->seqno),
 497                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 498                            ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ?
 499                             "on" : "off"),
 500                            hard_iface->net_dev->name,
 501                            hard_iface->net_dev->dev_addr);
 502
 503                 buff_pos += BATADV_OGM_HLEN;
 504                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 505                 packet_num++;
 506                 packet_pos = forw_packet->skb->data + buff_pos;
 507                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 508         }
 509
 510         /* create clone because function is called more than once */
 511         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 512         if (skb) {
 513                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 514                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 515                                    skb->len + ETH_HLEN);
 516                 batadv_send_broadcast_skb(skb, hard_iface);
 517         }
 518 }
 519
 520 /* send a batman ogm packet */
 521 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 522 {
 523         struct net_device *soft_iface;
 524         struct batadv_priv *bat_priv;
 525         struct batadv_hard_iface *primary_if = NULL;
 526
 527         if (!forw_packet->if_incoming) {
 528                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 529                 goto out;
 530         }
 531
 532         soft_iface = forw_packet->if_incoming->soft_iface;
 533         bat_priv = netdev_priv(soft_iface);
 534
 535         if (WARN_ON(!forw_packet->if_outgoing))
 536                 goto out;
 537
 538         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 539                 goto out;
 540
 541         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 542                 goto out;
 543
 544         primary_if = batadv_primary_if_get_selected(bat_priv);
 545         if (!primary_if)
 546                 goto out;
 547
 548         /* only for one specific outgoing interface */
 549         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 550
 551 out:
 552         if (primary_if)
 553                 batadv_hardif_put(primary_if);
 554 }
 555
 556 /**
 557  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 558  *  existing forward packet
 559  * @new_bat_ogm_packet: OGM packet to be aggregated
 560  * @bat_priv: the bat priv with all the soft interface information
 561  * @packet_len: (total) length of the OGM
 562  * @send_time: timestamp (jiffies) when the packet is to be sent
 563  * @directlink: true if this is a direct link packet
 564  * @if_incoming: interface where the packet was received
 565  * @if_outgoing: interface for which the retransmission should be considered
 566  * @forw_packet: the forwarded packet which should be checked
 567  *
 568  * Return: true if new_packet can be aggregated with forw_packet
 569  */
 570 static bool
 571 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 572                             struct batadv_priv *bat_priv,
 573                             int packet_len, unsigned long send_time,
 574                             bool directlink,
 575                             const struct batadv_hard_iface *if_incoming,
 576                             const struct batadv_hard_iface *if_outgoing,
 577                             const struct batadv_forw_packet *forw_packet)
 578 {
 579         struct batadv_ogm_packet *batadv_ogm_packet;
 580         int aggregated_bytes = forw_packet->packet_len + packet_len;
 581         struct batadv_hard_iface *primary_if = NULL;
 582         bool res = false;
 583         unsigned long aggregation_end_time;
 584
 585         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 586         aggregation_end_time = send_time;
 587         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 588
 589         /* we can aggregate the current packet to this aggregated packet
 590          * if:
 591          *
 592          * - the send time is within our MAX_AGGREGATION_MS time
 593          * - the resulting packet wont be bigger than
 594          *   MAX_AGGREGATION_BYTES
 595          * otherwise aggregation is not possible
 596          */
 597         if (!time_before(send_time, forw_packet->send_time) ||
 598             !time_after_eq(aggregation_end_time, forw_packet->send_time))
 599                 return false;
 600
 601         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
 602                 return false;
 603
 604         /* packet is not leaving on the same interface. */
 605         if (forw_packet->if_outgoing != if_outgoing)
 606                 return false;
 607
 608         /* check aggregation compatibility
 609          * -> direct link packets are broadcasted on
 610          *    their interface only
 611          * -> aggregate packet if the current packet is
 612          *    a "global" packet as well as the base
 613          *    packet
 614          */
 615         primary_if = batadv_primary_if_get_selected(bat_priv);
 616         if (!primary_if)
 617                 return false;
 618
 619         /* packets without direct link flag and high TTL
 620          * are flooded through the net
 621          */
 622         if (!directlink &&
 623             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
 624             batadv_ogm_packet->ttl != 1 &&
 625
 626             /* own packets originating non-primary
 627              * interfaces leave only that interface
 628              */
 629             (!forw_packet->own ||
 630              forw_packet->if_incoming == primary_if)) {
 631                 res = true;
 632                 goto out;
 633         }
 634
 635         /* if the incoming packet is sent via this one
 636          * interface only - we still can aggregate
 637          */
 638         if (directlink &&
 639             new_bat_ogm_packet->ttl == 1 &&
 640             forw_packet->if_incoming == if_incoming &&
 641
 642             /* packets from direct neighbors or
 643              * own secondary interface packets
 644              * (= secondary interface packets in general)
 645              */
 646             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 647              (forw_packet->own &&
 648               forw_packet->if_incoming != primary_if))) {
 649                 res = true;
 650                 goto out;
 651         }
 652
 653 out:
 654         if (primary_if)
 655                 batadv_hardif_put(primary_if);
 656         return res;
 657 }
 658
 659 /**
 660  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
 661  *  packet to it.
 662  * @packet_buff: pointer to the OGM
 663  * @packet_len: (total) length of the OGM
 664  * @send_time: timestamp (jiffies) when the packet is to be sent
 665  * @direct_link: whether this OGM has direct link status
 666  * @if_incoming: interface where the packet was received
 667  * @if_outgoing: interface for which the retransmission should be considered
 668  * @own_packet: true if it is a self-generated ogm
 669  */
 670 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 671                                         int packet_len, unsigned long send_time,
 672                                         bool direct_link,
 673                                         struct batadv_hard_iface *if_incoming,
 674                                         struct batadv_hard_iface *if_outgoing,
 675                                         int own_packet)
 676 {
 677         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 678         struct batadv_forw_packet *forw_packet_aggr;
 679         unsigned char *skb_buff;
 680         unsigned int skb_size;
 681
 682         /* own packet should always be scheduled */
 683         if (!own_packet) {
 684                 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 685                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 686                                    "batman packet queue full\n");
 687                         return;
 688                 }
 689         }
 690
 691         forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 692         if (!forw_packet_aggr)
 693                 goto out_nomem;
 694
 695         if (atomic_read(&bat_priv->aggregated_ogms) &&
 696             packet_len < BATADV_MAX_AGGREGATION_BYTES)
 697                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 698         else
 699                 skb_size = packet_len;
 700
 701         skb_size += ETH_HLEN;
 702
 703         forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 704         if (!forw_packet_aggr->skb)
 705                 goto out_free_forw_packet;
 706         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 707         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 708
 709         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 710         forw_packet_aggr->packet_len = packet_len;
 711         memcpy(skb_buff, packet_buff, packet_len);
 712
 713         kref_get(&if_incoming->refcount);
 714         kref_get(&if_outgoing->refcount);
 715         forw_packet_aggr->own = own_packet;
 716         forw_packet_aggr->if_incoming = if_incoming;
 717         forw_packet_aggr->if_outgoing = if_outgoing;
 718         forw_packet_aggr->num_packets = 0;
 719         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 720         forw_packet_aggr->send_time = send_time;
 721
 722         /* save packet direct link flag status */
 723         if (direct_link)
 724                 forw_packet_aggr->direct_link_flags |= 1;
 725
 726         /* add new packet to packet list */
 727         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 728         hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 729         spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 730
 731         /* start timer for this packet */
 732         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 733                           batadv_send_outstanding_bat_ogm_packet);
 734         queue_delayed_work(batadv_event_workqueue,
 735                            &forw_packet_aggr->delayed_work,
 736                            send_time - jiffies);
 737
 738         return;
 739 out_free_forw_packet:
 740         kfree(forw_packet_aggr);
 741 out_nomem:
 742         if (!own_packet)
 743                 atomic_inc(&bat_priv->batman_queue_left);
 744 }
 745
 746 /* aggregate a new packet into the existing ogm packet */
 747 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 748                                     const unsigned char *packet_buff,
 749                                     int packet_len, bool direct_link)
 750 {
 751         unsigned char *skb_buff;
 752         unsigned long new_direct_link_flag;
 753
 754         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 755         memcpy(skb_buff, packet_buff, packet_len);
 756         forw_packet_aggr->packet_len += packet_len;
 757         forw_packet_aggr->num_packets++;
 758
 759         /* save packet direct link flag status */
 760         if (direct_link) {
 761                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 762                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 763         }
 764 }
 765
 766 /**
 767  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 768  * @bat_priv: the bat priv with all the soft interface information
 769  * @packet_buff: pointer to the OGM
 770  * @packet_len: (total) length of the OGM
 771  * @if_incoming: interface where the packet was received
 772  * @if_outgoing: interface for which the retransmission should be considered
 773  * @own_packet: true if it is a self-generated ogm
 774  * @send_time: timestamp (jiffies) when the packet is to be sent
 775  */
 776 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 777                                     unsigned char *packet_buff,
 778                                     int packet_len,
 779                                     struct batadv_hard_iface *if_incoming,
 780                                     struct batadv_hard_iface *if_outgoing,
 781                                     int own_packet, unsigned long send_time)
 782 {
 783         /* _aggr -> pointer to the packet we want to aggregate with
 784          * _pos -> pointer to the position in the queue
 785          */
 786         struct batadv_forw_packet *forw_packet_aggr = NULL;
 787         struct batadv_forw_packet *forw_packet_pos = NULL;
 788         struct batadv_ogm_packet *batadv_ogm_packet;
 789         bool direct_link;
 790         unsigned long max_aggregation_jiffies;
 791
 792         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 793         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 794         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 795
 796         /* find position for the packet in the forward queue */
 797         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 798         /* own packets are not to be aggregated */
 799         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 800                 hlist_for_each_entry(forw_packet_pos,
 801                                      &bat_priv->forw_bat_list, list) {
 802                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 803                                                         bat_priv, packet_len,
 804                                                         send_time, direct_link,
 805                                                         if_incoming,
 806                                                         if_outgoing,
 807                                                         forw_packet_pos)) {
 808                                 forw_packet_aggr = forw_packet_pos;
 809                                 break;
 810                         }
 811                 }
 812         }
 813
 814         /* nothing to aggregate with - either aggregation disabled or no
 815          * suitable aggregation packet found
 816          */
 817         if (!forw_packet_aggr) {
 818                 /* the following section can run without the lock */
 819                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 820
 821                 /* if we could not aggregate this packet with one of the others
 822                  * we hold it back for a while, so that it might be aggregated
 823                  * later on
 824                  */
 825                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 826                         send_time += max_aggregation_jiffies;
 827
 828                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 829                                             send_time, direct_link,
 830                                             if_incoming, if_outgoing,
 831                                             own_packet);
 832         } else {
 833                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 834                                         packet_len, direct_link);
 835                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 836         }
 837 }
 838
 839 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 840                                   const struct ethhdr *ethhdr,
 841                                   struct batadv_ogm_packet *batadv_ogm_packet,
 842                                   bool is_single_hop_neigh,
 843                                   bool is_from_best_next_hop,
 844                                   struct batadv_hard_iface *if_incoming,
 845                                   struct batadv_hard_iface *if_outgoing)
 846 {
 847         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 848         u16 tvlv_len;
 849
 850         if (batadv_ogm_packet->ttl <= 1) {
 851                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 852                 return;
 853         }
 854
 855         if (!is_from_best_next_hop) {
 856                 /* Mark the forwarded packet when it is not coming from our
 857                  * best next hop. We still need to forward the packet for our
 858                  * neighbor link quality detection to work in case the packet
 859                  * originated from a single hop neighbor. Otherwise we can
 860                  * simply drop the ogm.
 861                  */
 862                 if (is_single_hop_neigh)
 863                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 864                 else
 865                         return;
 866         }
 867
 868         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 869
 870         batadv_ogm_packet->ttl--;
 871         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 872
 873         /* apply hop penalty */
 874         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 875                                                    bat_priv);
 876
 877         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 878                    "Forwarding packet: tq: %i, ttl: %i\n",
 879                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 880
 881         if (is_single_hop_neigh)
 882                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 883         else
 884                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 885
 886         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 887                                 BATADV_OGM_HLEN + tvlv_len,
 888                                 if_incoming, if_outgoing, 0,
 889                                 batadv_iv_ogm_fwd_send_time());
 890 }
 891
 892 /**
 893  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 894  * the given interface
 895  * @hard_iface: the interface for which the windows have to be shifted
 896  */
 897 static void
 898 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 899 {
 900         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 901         struct batadv_hashtable *hash = bat_priv->orig_hash;
 902         struct hlist_head *head;
 903         struct batadv_orig_node *orig_node;
 904         unsigned long *word;
 905         u32 i;
 906         size_t word_index;
 907         u8 *w;
 908         int if_num;
 909
 910         for (i = 0; i < hash->size; i++) {
 911                 head = &hash->table[i];
 912
 913                 rcu_read_lock();
 914                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 915                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 916                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 917                         word = &orig_node->bat_iv.bcast_own[word_index];
 918
 919                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 920                         if_num = hard_iface->if_num;
 921                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 922                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 923                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 924                 }
 925                 rcu_read_unlock();
 926         }
 927 }
 928
 929 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 930 {
 931         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 932         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 933         struct batadv_ogm_packet *batadv_ogm_packet;
 934         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 935         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 936         u32 seqno;
 937         u16 tvlv_len = 0;
 938         unsigned long send_time;
 939
 940         primary_if = batadv_primary_if_get_selected(bat_priv);
 941
 942         if (hard_iface == primary_if) {
 943                 /* tt changes have to be committed before the tvlv data is
 944                  * appended as it may alter the tt tvlv container
 945                  */
 946                 batadv_tt_local_commit_changes(bat_priv);
 947                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 948                                                             ogm_buff_len,
 949                                                             BATADV_OGM_HLEN);
 950         }
 951
 952         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 953         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 954
 955         /* change sequence number to network order */
 956         seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 957         batadv_ogm_packet->seqno = htonl(seqno);
 958         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 959
 960         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 961
 962         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 963
 964         if (hard_iface != primary_if) {
 965                 /* OGMs from secondary interfaces are only scheduled on their
 966                  * respective interfaces.
 967                  */
 968                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 969                                         hard_iface, hard_iface, 1, send_time);
 970                 goto out;
 971         }
 972
 973         /* OGMs from primary interfaces are scheduled on all
 974          * interfaces.
 975          */
 976         rcu_read_lock();
 977         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 978                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 979                         continue;
 980
 981                 if (!kref_get_unless_zero(&tmp_hard_iface->refcount))
 982                         continue;
 983
 984                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 985                                         *ogm_buff_len, hard_iface,
 986                                         tmp_hard_iface, 1, send_time);
 987
 988                 batadv_hardif_put(tmp_hard_iface);
 989         }
 990         rcu_read_unlock();
 991
 992 out:
 993         if (primary_if)
 994                 batadv_hardif_put(primary_if);
 995 }
 996
 997 /**
 998  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
 999  *  originator
1000  * @bat_priv: the bat priv with all the soft interface information
1001  * @orig_node: the orig node who originally emitted the ogm packet
1002  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
1003  * @ethhdr: Ethernet header of the OGM
1004  * @batadv_ogm_packet: the ogm packet
1005  * @if_incoming: interface where the packet was received
1006  * @if_outgoing: interface for which the retransmission should be considered
1007  * @dup_status: the duplicate status of this ogm packet.
1008  */
1009 static void
1010 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
1011                           struct batadv_orig_node *orig_node,
1012                           struct batadv_orig_ifinfo *orig_ifinfo,
1013                           const struct ethhdr *ethhdr,
1014                           const struct batadv_ogm_packet *batadv_ogm_packet,
1015                           struct batadv_hard_iface *if_incoming,
1016                           struct batadv_hard_iface *if_outgoing,
1017                           enum batadv_dup_status dup_status)
1018 {
1019         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
1020         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1021         struct batadv_neigh_node *neigh_node = NULL;
1022         struct batadv_neigh_node *tmp_neigh_node = NULL;
1023         struct batadv_neigh_node *router = NULL;
1024         struct batadv_orig_node *orig_node_tmp;
1025         int if_num;
1026         u8 sum_orig, sum_neigh;
1027         u8 *neigh_addr;
1028         u8 tq_avg;
1029
1030         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1031                    "update_originator(): Searching and updating originator entry of received packet\n");
1032
1033         rcu_read_lock();
1034         hlist_for_each_entry_rcu(tmp_neigh_node,
1035                                  &orig_node->neigh_list, list) {
1036                 neigh_addr = tmp_neigh_node->addr;
1037                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1038                     tmp_neigh_node->if_incoming == if_incoming &&
1039                     kref_get_unless_zero(&tmp_neigh_node->refcount)) {
1040                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1041                                 batadv_neigh_node_put(neigh_node);
1042                         neigh_node = tmp_neigh_node;
1043                         continue;
1044                 }
1045
1046                 if (dup_status != BATADV_NO_DUP)
1047                         continue;
1048
1049                 /* only update the entry for this outgoing interface */
1050                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1051                                                        if_outgoing);
1052                 if (!neigh_ifinfo)
1053                         continue;
1054
1055                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1056                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1057                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1058                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1059                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1060                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1061
1062                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1063                 neigh_ifinfo = NULL;
1064         }
1065
1066         if (!neigh_node) {
1067                 struct batadv_orig_node *orig_tmp;
1068
1069                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1070                 if (!orig_tmp)
1071                         goto unlock;
1072
1073                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1074                                                      ethhdr->h_source,
1075                                                      orig_node, orig_tmp);
1076
1077                 batadv_orig_node_put(orig_tmp);
1078                 if (!neigh_node)
1079                         goto unlock;
1080         } else {
1081                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1082                            "Updating existing last-hop neighbor of originator\n");
1083         }
1084
1085         rcu_read_unlock();
1086         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1087         if (!neigh_ifinfo)
1088                 goto out;
1089
1090         neigh_node->last_seen = jiffies;
1091
1092         spin_lock_bh(&neigh_node->ifinfo_lock);
1093         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1094                                &neigh_ifinfo->bat_iv.tq_index,
1095                                batadv_ogm_packet->tq);
1096         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1097         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1098         spin_unlock_bh(&neigh_node->ifinfo_lock);
1099
1100         if (dup_status == BATADV_NO_DUP) {
1101                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1102                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1103         }
1104
1105         /* if this neighbor already is our next hop there is nothing
1106          * to change
1107          */
1108         router = batadv_orig_router_get(orig_node, if_outgoing);
1109         if (router == neigh_node)
1110                 goto out;
1111
1112         if (router) {
1113                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1114                 if (!router_ifinfo)
1115                         goto out;
1116
1117                 /* if this neighbor does not offer a better TQ we won't
1118                  * consider it
1119                  */
1120                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1121                         goto out;
1122         }
1123
1124         /* if the TQ is the same and the link not more symmetric we
1125          * won't consider it either
1126          */
1127         if (router_ifinfo &&
1128             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1129                 orig_node_tmp = router->orig_node;
1130                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1131                 if_num = router->if_incoming->if_num;
1132                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1133                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1134
1135                 orig_node_tmp = neigh_node->orig_node;
1136                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1137                 if_num = neigh_node->if_incoming->if_num;
1138                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1139                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1140
1141                 if (sum_orig >= sum_neigh)
1142                         goto out;
1143         }
1144
1145         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1146         goto out;
1147
1148 unlock:
1149         rcu_read_unlock();
1150 out:
1151         if (neigh_node)
1152                 batadv_neigh_node_put(neigh_node);
1153         if (router)
1154                 batadv_neigh_node_put(router);
1155         if (neigh_ifinfo)
1156                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1157         if (router_ifinfo)
1158                 batadv_neigh_ifinfo_put(router_ifinfo);
1159 }
1160
1161 /**
1162  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1163  * @orig_node: the orig node who originally emitted the ogm packet
1164  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1165  * @batadv_ogm_packet: the ogm packet
1166  * @if_incoming: interface where the packet was received
1167  * @if_outgoing: interface for which the retransmission should be considered
1168  *
1169  * Return: true if the link can be considered bidirectional, false otherwise
1170  */
1171 static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1172                                   struct batadv_orig_node *orig_neigh_node,
1173                                   struct batadv_ogm_packet *batadv_ogm_packet,
1174                                   struct batadv_hard_iface *if_incoming,
1175                                   struct batadv_hard_iface *if_outgoing)
1176 {
1177         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1178         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1179         struct batadv_neigh_ifinfo *neigh_ifinfo;
1180         u8 total_count;
1181         u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1182         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1183         int if_num;
1184         unsigned int tq_asym_penalty, inv_asym_penalty;
1185         unsigned int combined_tq;
1186         unsigned int tq_iface_penalty;
1187         bool ret = false;
1188
1189         /* find corresponding one hop neighbor */
1190         rcu_read_lock();
1191         hlist_for_each_entry_rcu(tmp_neigh_node,
1192                                  &orig_neigh_node->neigh_list, list) {
1193                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1194                                         orig_neigh_node->orig))
1195                         continue;
1196
1197                 if (tmp_neigh_node->if_incoming != if_incoming)
1198                         continue;
1199
1200                 if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
1201                         continue;
1202
1203                 neigh_node = tmp_neigh_node;
1204                 break;
1205         }
1206         rcu_read_unlock();
1207
1208         if (!neigh_node)
1209                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1210                                                      orig_neigh_node->orig,
1211                                                      orig_neigh_node,
1212                                                      orig_neigh_node);
1213
1214         if (!neigh_node)
1215                 goto out;
1216
1217         /* if orig_node is direct neighbor update neigh_node last_seen */
1218         if (orig_node == orig_neigh_node)
1219                 neigh_node->last_seen = jiffies;
1220
1221         orig_node->last_seen = jiffies;
1222
1223         /* find packet count of corresponding one hop neighbor */
1224         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1225         if_num = if_incoming->if_num;
1226         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1227         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1228         if (neigh_ifinfo) {
1229                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1230                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1231         } else {
1232                 neigh_rq_count = 0;
1233         }
1234         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1235
1236         /* pay attention to not get a value bigger than 100 % */
1237         if (orig_eq_count > neigh_rq_count)
1238                 total_count = neigh_rq_count;
1239         else
1240                 total_count = orig_eq_count;
1241
1242         /* if we have too few packets (too less data) we set tq_own to zero
1243          * if we receive too few packets it is not considered bidirectional
1244          */
1245         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1246             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1247                 tq_own = 0;
1248         else
1249                 /* neigh_node->real_packet_count is never zero as we
1250                  * only purge old information when getting new
1251                  * information
1252                  */
1253                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1254
1255         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1256          * affect the nearly-symmetric links only a little, but
1257          * punishes asymmetric links more.  This will give a value
1258          * between 0 and TQ_MAX_VALUE
1259          */
1260         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1261         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1262         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1263                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1264                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1265         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1266         inv_asym_penalty /= neigh_rq_max_cube;
1267         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1268
1269         /* penalize if the OGM is forwarded on the same interface. WiFi
1270          * interfaces and other half duplex devices suffer from throughput
1271          * drops as they can't send and receive at the same time.
1272          */
1273         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1274         if (if_outgoing && (if_incoming == if_outgoing) &&
1275             batadv_is_wifi_netdev(if_outgoing->net_dev))
1276                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1277                                                       bat_priv);
1278
1279         combined_tq = batadv_ogm_packet->tq *
1280                       tq_own *
1281                       tq_asym_penalty *
1282                       tq_iface_penalty;
1283         combined_tq /= BATADV_TQ_MAX_VALUE *
1284                        BATADV_TQ_MAX_VALUE *
1285                        BATADV_TQ_MAX_VALUE;
1286         batadv_ogm_packet->tq = combined_tq;
1287
1288         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1289                    "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",
1290                    orig_node->orig, orig_neigh_node->orig, total_count,
1291                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1292                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1293                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1294
1295         /* if link has the minimum required transmission quality
1296          * consider it bidirectional
1297          */
1298         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1299                 ret = true;
1300
1301 out:
1302         if (neigh_node)
1303                 batadv_neigh_node_put(neigh_node);
1304         return ret;
1305 }
1306
1307 /**
1308  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1309  *  adjust the sequence number and find out whether it is a duplicate
1310  * @ethhdr: ethernet header of the packet
1311  * @batadv_ogm_packet: OGM packet to be considered
1312  * @if_incoming: interface on which the OGM packet was received
1313  * @if_outgoing: interface for which the retransmission should be considered
1314  *
1315  * Return: duplicate status as enum batadv_dup_status
1316  */
1317 static enum batadv_dup_status
1318 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1319                             const struct batadv_ogm_packet *batadv_ogm_packet,
1320                             const struct batadv_hard_iface *if_incoming,
1321                             struct batadv_hard_iface *if_outgoing)
1322 {
1323         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1324         struct batadv_orig_node *orig_node;
1325         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1326         struct batadv_neigh_node *neigh_node;
1327         struct batadv_neigh_ifinfo *neigh_ifinfo;
1328         bool is_dup;
1329         s32 seq_diff;
1330         bool need_update = false;
1331         int set_mark;
1332         enum batadv_dup_status ret = BATADV_NO_DUP;
1333         u32 seqno = ntohl(batadv_ogm_packet->seqno);
1334         u8 *neigh_addr;
1335         u8 packet_count;
1336         unsigned long *bitmap;
1337
1338         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1339         if (!orig_node)
1340                 return BATADV_NO_DUP;
1341
1342         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1343         if (WARN_ON(!orig_ifinfo)) {
1344                 batadv_orig_node_put(orig_node);
1345                 return 0;
1346         }
1347
1348         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1349         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1350
1351         /* signalize caller that the packet is to be dropped. */
1352         if (!hlist_empty(&orig_node->neigh_list) &&
1353             batadv_window_protected(bat_priv, seq_diff,
1354                                     BATADV_TQ_LOCAL_WINDOW_SIZE,
1355                                     &orig_ifinfo->batman_seqno_reset, NULL)) {
1356                 ret = BATADV_PROTECTED;
1357                 goto out;
1358         }
1359
1360         rcu_read_lock();
1361         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1362                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1363                                                        if_outgoing);
1364                 if (!neigh_ifinfo)
1365                         continue;
1366
1367                 neigh_addr = neigh_node->addr;
1368                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1369                                          orig_ifinfo->last_real_seqno,
1370                                          seqno);
1371
1372                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1373                     neigh_node->if_incoming == if_incoming) {
1374                         set_mark = 1;
1375                         if (is_dup)
1376                                 ret = BATADV_NEIGH_DUP;
1377                 } else {
1378                         set_mark = 0;
1379                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1380                                 ret = BATADV_ORIG_DUP;
1381                 }
1382
1383                 /* if the window moved, set the update flag. */
1384                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1385                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1386                                                      seq_diff, set_mark);
1387
1388                 packet_count = bitmap_weight(bitmap,
1389                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1390                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1391                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1392         }
1393         rcu_read_unlock();
1394
1395         if (need_update) {
1396                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1397                            "%s updating last_seqno: old %u, new %u\n",
1398                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1399                            orig_ifinfo->last_real_seqno, seqno);
1400                 orig_ifinfo->last_real_seqno = seqno;
1401         }
1402
1403 out:
1404         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1405         batadv_orig_node_put(orig_node);
1406         batadv_orig_ifinfo_put(orig_ifinfo);
1407         return ret;
1408 }
1409
1410 /**
1411  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1412  * @skb: the skb containing the OGM
1413  * @ogm_offset: offset from skb->data to start of ogm header
1414  * @orig_node: the (cached) orig node for the originator of this OGM
1415  * @if_incoming: the interface where this packet was received
1416  * @if_outgoing: the interface for which the packet should be considered
1417  */
1418 static void
1419 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1420                                 struct batadv_orig_node *orig_node,
1421                                 struct batadv_hard_iface *if_incoming,
1422                                 struct batadv_hard_iface *if_outgoing)
1423 {
1424         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1425         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
1426         struct batadv_neigh_node *router = NULL;
1427         struct batadv_neigh_node *router_router = NULL;
1428         struct batadv_orig_node *orig_neigh_node;
1429         struct batadv_orig_ifinfo *orig_ifinfo;
1430         struct batadv_neigh_node *orig_neigh_router = NULL;
1431         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1432         struct batadv_ogm_packet *ogm_packet;
1433         enum batadv_dup_status dup_status;
1434         bool is_from_best_next_hop = false;
1435         bool is_single_hop_neigh = false;
1436         bool sameseq, similar_ttl;
1437         struct sk_buff *skb_priv;
1438         struct ethhdr *ethhdr;
1439         u8 *prev_sender;
1440         bool is_bidirect;
1441
1442         /* create a private copy of the skb, as some functions change tq value
1443          * and/or flags.
1444          */
1445         skb_priv = skb_copy(skb, GFP_ATOMIC);
1446         if (!skb_priv)
1447                 return;
1448
1449         ethhdr = eth_hdr(skb_priv);
1450         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1451
1452         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1453                                                  if_incoming, if_outgoing);
1454         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1455                 is_single_hop_neigh = true;
1456
1457         if (dup_status == BATADV_PROTECTED) {
1458                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1459                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1460                            ethhdr->h_source);
1461                 goto out;
1462         }
1463
1464         if (ogm_packet->tq == 0) {
1465                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1466                            "Drop packet: originator packet with tq equal 0\n");
1467                 goto out;
1468         }
1469
1470         if (is_single_hop_neigh) {
1471                 hardif_neigh = batadv_hardif_neigh_get(if_incoming,
1472                                                        ethhdr->h_source);
1473                 if (hardif_neigh)
1474                         hardif_neigh->last_seen = jiffies;
1475         }
1476
1477         router = batadv_orig_router_get(orig_node, if_outgoing);
1478         if (router) {
1479                 router_router = batadv_orig_router_get(router->orig_node,
1480                                                        if_outgoing);
1481                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1482         }
1483
1484         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1485             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1486                 is_from_best_next_hop = true;
1487
1488         prev_sender = ogm_packet->prev_sender;
1489         /* avoid temporary routing loops */
1490         if (router && router_router &&
1491             (batadv_compare_eth(router->addr, prev_sender)) &&
1492             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1493             (batadv_compare_eth(router->addr, router_router->addr))) {
1494                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1495                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1496                            ethhdr->h_source);
1497                 goto out;
1498         }
1499
1500         if (if_outgoing == BATADV_IF_DEFAULT)
1501                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1502
1503         /* if sender is a direct neighbor the sender mac equals
1504          * originator mac
1505          */
1506         if (is_single_hop_neigh)
1507                 orig_neigh_node = orig_node;
1508         else
1509                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1510                                                          ethhdr->h_source);
1511
1512         if (!orig_neigh_node)
1513                 goto out;
1514
1515         /* Update nc_nodes of the originator */
1516         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1517                                  ogm_packet, is_single_hop_neigh);
1518
1519         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1520                                                    if_outgoing);
1521
1522         /* drop packet if sender is not a direct neighbor and if we
1523          * don't route towards it
1524          */
1525         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1526                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1527                            "Drop packet: OGM via unknown neighbor!\n");
1528                 goto out_neigh;
1529         }
1530
1531         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1532                                             ogm_packet, if_incoming,
1533                                             if_outgoing);
1534
1535         /* update ranking if it is not a duplicate or has the same
1536          * seqno and similar ttl as the non-duplicate
1537          */
1538         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1539         if (!orig_ifinfo)
1540                 goto out_neigh;
1541
1542         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1543         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1544
1545         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1546                             (sameseq && similar_ttl))) {
1547                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1548                                           orig_ifinfo, ethhdr,
1549                                           ogm_packet, if_incoming,
1550                                           if_outgoing, dup_status);
1551         }
1552         batadv_orig_ifinfo_put(orig_ifinfo);
1553
1554         /* only forward for specific interface, not for the default one. */
1555         if (if_outgoing == BATADV_IF_DEFAULT)
1556                 goto out_neigh;
1557
1558         /* is single hop (direct) neighbor */
1559         if (is_single_hop_neigh) {
1560                 /* OGMs from secondary interfaces should only scheduled once
1561                  * per interface where it has been received, not multiple times
1562                  */
1563                 if ((ogm_packet->ttl <= 2) &&
1564                     (if_incoming != if_outgoing)) {
1565                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1566                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1567                         goto out_neigh;
1568                 }
1569                 /* mark direct link on incoming interface */
1570                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1571                                       is_single_hop_neigh,
1572                                       is_from_best_next_hop, if_incoming,
1573                                       if_outgoing);
1574
1575                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1576                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1577                 goto out_neigh;
1578         }
1579
1580         /* multihop originator */
1581         if (!is_bidirect) {
1582                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1583                            "Drop packet: not received via bidirectional link\n");
1584                 goto out_neigh;
1585         }
1586
1587         if (dup_status == BATADV_NEIGH_DUP) {
1588                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1589                            "Drop packet: duplicate packet received\n");
1590                 goto out_neigh;
1591         }
1592
1593         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1594                    "Forwarding packet: rebroadcast originator packet\n");
1595         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1596                               is_single_hop_neigh, is_from_best_next_hop,
1597                               if_incoming, if_outgoing);
1598
1599 out_neigh:
1600         if ((orig_neigh_node) && (!is_single_hop_neigh))
1601                 batadv_orig_node_put(orig_neigh_node);
1602 out:
1603         if (router_ifinfo)
1604                 batadv_neigh_ifinfo_put(router_ifinfo);
1605         if (router)
1606                 batadv_neigh_node_put(router);
1607         if (router_router)
1608                 batadv_neigh_node_put(router_router);
1609         if (orig_neigh_router)
1610                 batadv_neigh_node_put(orig_neigh_router);
1611         if (hardif_neigh)
1612                 batadv_hardif_neigh_put(hardif_neigh);
1613
1614         kfree_skb(skb_priv);
1615 }
1616
1617 /**
1618  * batadv_iv_ogm_process - process an incoming batman iv OGM
1619  * @skb: the skb containing the OGM
1620  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1621  * @if_incoming: the interface where this packet was receved
1622  */
1623 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1624                                   struct batadv_hard_iface *if_incoming)
1625 {
1626         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1627         struct batadv_orig_node *orig_neigh_node, *orig_node;
1628         struct batadv_hard_iface *hard_iface;
1629         struct batadv_ogm_packet *ogm_packet;
1630         u32 if_incoming_seqno;
1631         bool has_directlink_flag;
1632         struct ethhdr *ethhdr;
1633         bool is_my_oldorig = false;
1634         bool is_my_addr = false;
1635         bool is_my_orig = false;
1636
1637         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1638         ethhdr = eth_hdr(skb);
1639
1640         /* Silently drop when the batman packet is actually not a
1641          * correct packet.
1642          *
1643          * This might happen if a packet is padded (e.g. Ethernet has a
1644          * minimum frame length of 64 byte) and the aggregation interprets
1645          * it as an additional length.
1646          *
1647          * TODO: A more sane solution would be to have a bit in the
1648          * batadv_ogm_packet to detect whether the packet is the last
1649          * packet in an aggregation.  Here we expect that the padding
1650          * is always zero (or not 0x01)
1651          */
1652         if (ogm_packet->packet_type != BATADV_IV_OGM)
1653                 return;
1654
1655         /* could be changed by schedule_own_packet() */
1656         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1657
1658         if (ogm_packet->flags & BATADV_DIRECTLINK)
1659                 has_directlink_flag = true;
1660         else
1661                 has_directlink_flag = false;
1662
1663         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1664                    "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",
1665                    ethhdr->h_source, if_incoming->net_dev->name,
1666                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1667                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1668                    ogm_packet->tq, ogm_packet->ttl,
1669                    ogm_packet->version, has_directlink_flag);
1670
1671         rcu_read_lock();
1672         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1673                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1674                         continue;
1675
1676                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1677                         continue;
1678
1679                 if (batadv_compare_eth(ethhdr->h_source,
1680                                        hard_iface->net_dev->dev_addr))
1681                         is_my_addr = true;
1682
1683                 if (batadv_compare_eth(ogm_packet->orig,
1684                                        hard_iface->net_dev->dev_addr))
1685                         is_my_orig = true;
1686
1687                 if (batadv_compare_eth(ogm_packet->prev_sender,
1688                                        hard_iface->net_dev->dev_addr))
1689                         is_my_oldorig = true;
1690         }
1691         rcu_read_unlock();
1692
1693         if (is_my_addr) {
1694                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1695                            "Drop packet: received my own broadcast (sender: %pM)\n",
1696                            ethhdr->h_source);
1697                 return;
1698         }
1699
1700         if (is_my_orig) {
1701                 unsigned long *word;
1702                 int offset;
1703                 s32 bit_pos;
1704                 s16 if_num;
1705                 u8 *weight;
1706
1707                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1708                                                          ethhdr->h_source);
1709                 if (!orig_neigh_node)
1710                         return;
1711
1712                 /* neighbor has to indicate direct link and it has to
1713                  * come via the corresponding interface
1714                  * save packet seqno for bidirectional check
1715                  */
1716                 if (has_directlink_flag &&
1717                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1718                                        ogm_packet->orig)) {
1719                         if_num = if_incoming->if_num;
1720                         offset = if_num * BATADV_NUM_WORDS;
1721
1722                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1723                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1724                         bit_pos = if_incoming_seqno - 2;
1725                         bit_pos -= ntohl(ogm_packet->seqno);
1726                         batadv_set_bit(word, bit_pos);
1727                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1728                         *weight = bitmap_weight(word,
1729                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1730                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1731                 }
1732
1733                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1734                            "Drop packet: originator packet from myself (via neighbor)\n");
1735                 batadv_orig_node_put(orig_neigh_node);
1736                 return;
1737         }
1738
1739         if (is_my_oldorig) {
1740                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1741                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1742                            ethhdr->h_source);
1743                 return;
1744         }
1745
1746         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1747                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1748                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1749                            ethhdr->h_source);
1750                 return;
1751         }
1752
1753         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1754         if (!orig_node)
1755                 return;
1756
1757         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1758                                         if_incoming, BATADV_IF_DEFAULT);
1759
1760         rcu_read_lock();
1761         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1762                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1763                         continue;
1764
1765                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1766                         continue;
1767
1768                 if (!kref_get_unless_zero(&hard_iface->refcount))
1769                         continue;
1770
1771                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1772                                                 if_incoming, hard_iface);
1773
1774                 batadv_hardif_put(hard_iface);
1775         }
1776         rcu_read_unlock();
1777
1778         batadv_orig_node_put(orig_node);
1779 }
1780
1781 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1782                                  struct batadv_hard_iface *if_incoming)
1783 {
1784         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1785         struct batadv_ogm_packet *ogm_packet;
1786         u8 *packet_pos;
1787         int ogm_offset;
1788         bool ret;
1789
1790         ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1791         if (!ret)
1792                 return NET_RX_DROP;
1793
1794         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1795          * that does not have B.A.T.M.A.N. IV enabled ?
1796          */
1797         if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1798                 return NET_RX_DROP;
1799
1800         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1801         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1802                            skb->len + ETH_HLEN);
1803
1804         ogm_offset = 0;
1805         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1806
1807         /* unpack the aggregated packets and process them one by one */
1808         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1809                                          ogm_packet->tvlv_len)) {
1810                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1811
1812                 ogm_offset += BATADV_OGM_HLEN;
1813                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1814
1815                 packet_pos = skb->data + ogm_offset;
1816                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1817         }
1818
1819         kfree_skb(skb);
1820         return NET_RX_SUCCESS;
1821 }
1822
1823 /**
1824  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1825  * @orig_node: the orig_node for which the neighbors are printed
1826  * @if_outgoing: outgoing interface for these entries
1827  * @seq: debugfs table seq_file struct
1828  *
1829  * Must be called while holding an rcu lock.
1830  */
1831 static void
1832 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1833                                struct batadv_hard_iface *if_outgoing,
1834                                struct seq_file *seq)
1835 {
1836         struct batadv_neigh_node *neigh_node;
1837         struct batadv_neigh_ifinfo *n_ifinfo;
1838
1839         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1840                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1841                 if (!n_ifinfo)
1842                         continue;
1843
1844                 seq_printf(seq, " %pM (%3i)",
1845                            neigh_node->addr,
1846                            n_ifinfo->bat_iv.tq_avg);
1847
1848                 batadv_neigh_ifinfo_put(n_ifinfo);
1849         }
1850 }
1851
1852 /**
1853  * batadv_iv_ogm_orig_print - print the originator table
1854  * @bat_priv: the bat priv with all the soft interface information
1855  * @seq: debugfs table seq_file struct
1856  * @if_outgoing: the outgoing interface for which this should be printed
1857  */
1858 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1859                                      struct seq_file *seq,
1860                                      struct batadv_hard_iface *if_outgoing)
1861 {
1862         struct batadv_neigh_node *neigh_node;
1863         struct batadv_hashtable *hash = bat_priv->orig_hash;
1864         int last_seen_msecs, last_seen_secs;
1865         struct batadv_orig_node *orig_node;
1866         struct batadv_neigh_ifinfo *n_ifinfo;
1867         unsigned long last_seen_jiffies;
1868         struct hlist_head *head;
1869         int batman_count = 0;
1870         u32 i;
1871
1872         seq_puts(seq,
1873                  "  Originator      last-seen (#/255)           Nexthop [outgoingIF]:   Potential nexthops ...\n");
1874
1875         for (i = 0; i < hash->size; i++) {
1876                 head = &hash->table[i];
1877
1878                 rcu_read_lock();
1879                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1880                         neigh_node = batadv_orig_router_get(orig_node,
1881                                                             if_outgoing);
1882                         if (!neigh_node)
1883                                 continue;
1884
1885                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1886                                                            if_outgoing);
1887                         if (!n_ifinfo)
1888                                 goto next;
1889
1890                         if (n_ifinfo->bat_iv.tq_avg == 0)
1891                                 goto next;
1892
1893                         last_seen_jiffies = jiffies - orig_node->last_seen;
1894                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1895                         last_seen_secs = last_seen_msecs / 1000;
1896                         last_seen_msecs = last_seen_msecs % 1000;
1897
1898                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1899                                    orig_node->orig, last_seen_secs,
1900                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1901                                    neigh_node->addr,
1902                                    neigh_node->if_incoming->net_dev->name);
1903
1904                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1905                                                        seq);
1906                         seq_puts(seq, "\n");
1907                         batman_count++;
1908
1909 next:
1910                         batadv_neigh_node_put(neigh_node);
1911                         if (n_ifinfo)
1912                                 batadv_neigh_ifinfo_put(n_ifinfo);
1913                 }
1914                 rcu_read_unlock();
1915         }
1916
1917         if (batman_count == 0)
1918                 seq_puts(seq, "No batman nodes in range ...\n");
1919 }
1920
1921 /**
1922  * batadv_iv_hardif_neigh_print - print a single hop neighbour node
1923  * @seq: neighbour table seq_file struct
1924  * @hardif_neigh: hardif neighbour information
1925  */
1926 static void
1927 batadv_iv_hardif_neigh_print(struct seq_file *seq,
1928                              struct batadv_hardif_neigh_node *hardif_neigh)
1929 {
1930         int last_secs, last_msecs;
1931
1932         last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
1933         last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
1934
1935         seq_printf(seq, "   %10s   %pM %4i.%03is\n",
1936                    hardif_neigh->if_incoming->net_dev->name,
1937                    hardif_neigh->addr, last_secs, last_msecs);
1938 }
1939
1940 /**
1941  * batadv_iv_ogm_neigh_print - print the single hop neighbour list
1942  * @bat_priv: the bat priv with all the soft interface information
1943  * @seq: neighbour table seq_file struct
1944  */
1945 static void batadv_iv_neigh_print(struct batadv_priv *bat_priv,
1946                                   struct seq_file *seq)
1947 {
1948         struct net_device *net_dev = (struct net_device *)seq->private;
1949         struct batadv_hardif_neigh_node *hardif_neigh;
1950         struct batadv_hard_iface *hard_iface;
1951         int batman_count = 0;
1952
1953         seq_puts(seq, "           IF        Neighbor      last-seen\n");
1954
1955         rcu_read_lock();
1956         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1957                 if (hard_iface->soft_iface != net_dev)
1958                         continue;
1959
1960                 hlist_for_each_entry_rcu(hardif_neigh,
1961                                          &hard_iface->neigh_list, list) {
1962                         batadv_iv_hardif_neigh_print(seq, hardif_neigh);
1963                         batman_count++;
1964                 }
1965         }
1966         rcu_read_unlock();
1967
1968         if (batman_count == 0)
1969                 seq_puts(seq, "No batman nodes in range ...\n");
1970 }
1971
1972 /**
1973  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1974  * @neigh1: the first neighbor object of the comparison
1975  * @if_outgoing1: outgoing interface for the first neighbor
1976  * @neigh2: the second neighbor object of the comparison
1977  * @if_outgoing2: outgoing interface for the second neighbor
1978  *
1979  * Return: a value less, equal to or greater than 0 if the metric via neigh1 is
1980  * lower, the same as or higher than the metric via neigh2
1981  */
1982 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1983                                    struct batadv_hard_iface *if_outgoing1,
1984                                    struct batadv_neigh_node *neigh2,
1985                                    struct batadv_hard_iface *if_outgoing2)
1986 {
1987         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1988         u8 tq1, tq2;
1989         int diff;
1990
1991         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1992         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1993
1994         if (!neigh1_ifinfo || !neigh2_ifinfo) {
1995                 diff = 0;
1996                 goto out;
1997         }
1998
1999         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2000         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2001         diff = tq1 - tq2;
2002
2003 out:
2004         if (neigh1_ifinfo)
2005                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
2006         if (neigh2_ifinfo)
2007                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
2008
2009         return diff;
2010 }
2011
2012 /**
2013  * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better
2014  *  than neigh2 from the metric prospective
2015  * @neigh1: the first neighbor object of the comparison
2016  * @if_outgoing1: outgoing interface for the first neighbor
2017  * @neigh2: the second neighbor object of the comparison
2018  * @if_outgoing2: outgoing interface for the second neighbor
2019  *
2020  * Return: true if the metric via neigh1 is equally good or better than
2021  * the metric via neigh2, false otherwise.
2022  */
2023 static bool
2024 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1,
2025                            struct batadv_hard_iface *if_outgoing1,
2026                            struct batadv_neigh_node *neigh2,
2027                            struct batadv_hard_iface *if_outgoing2)
2028 {
2029         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
2030         u8 tq1, tq2;
2031         bool ret;
2032
2033         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
2034         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
2035
2036         /* we can't say that the metric is better */
2037         if (!neigh1_ifinfo || !neigh2_ifinfo) {
2038                 ret = false;
2039                 goto out;
2040         }
2041
2042         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2043         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2044         ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
2045
2046 out:
2047         if (neigh1_ifinfo)
2048                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
2049         if (neigh2_ifinfo)
2050                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
2051
2052         return ret;
2053 }
2054
2055 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
2056         .name = "BATMAN_IV",
2057         .bat_iface_enable = batadv_iv_ogm_iface_enable,
2058         .bat_iface_disable = batadv_iv_ogm_iface_disable,
2059         .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
2060         .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
2061         .bat_ogm_schedule = batadv_iv_ogm_schedule,
2062         .bat_ogm_emit = batadv_iv_ogm_emit,
2063         .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
2064         .bat_neigh_is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
2065         .bat_neigh_print = batadv_iv_neigh_print,
2066         .bat_orig_print = batadv_iv_ogm_orig_print,
2067         .bat_orig_free = batadv_iv_ogm_orig_free,
2068         .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
2069         .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
2070 };
2071
2072 int __init batadv_iv_init(void)
2073 {
2074         int ret;
2075
2076         /* batman originator packet */
2077         ret = batadv_recv_handler_register(BATADV_IV_OGM,
2078                                            batadv_iv_ogm_receive);
2079         if (ret < 0)
2080                 goto out;
2081
2082         ret = batadv_algo_register(&batadv_batman_iv);
2083         if (ret < 0)
2084                 goto handler_unregister;
2085
2086         goto out;
2087
2088 handler_unregister:
2089         batadv_recv_handler_unregister(BATADV_IV_OGM);
2090 out:
2091         return ret;
2092 }