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