net/batman-adv/bat_iv_ogm.c

   1 /* Copyright (C) 2007-2017  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/netlink.h>
  39 #include <linux/pkt_sched.h>
  40 #include <linux/printk.h>
  41 #include <linux/random.h>
  42 #include <linux/rculist.h>
  43 #include <linux/rcupdate.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/slab.h>
  47 #include <linux/spinlock.h>
  48 #include <linux/stddef.h>
  49 #include <linux/string.h>
  50 #include <linux/types.h>
  51 #include <linux/workqueue.h>
  52 #include <net/genetlink.h>
  53 #include <net/netlink.h>
  54 #include <uapi/linux/batman_adv.h>
  55
  56 #include "bat_algo.h"
  57 #include "bitarray.h"
  58 #include "gateway_client.h"
  59 #include "hard-interface.h"
  60 #include "hash.h"
  61 #include "log.h"
  62 #include "netlink.h"
  63 #include "network-coding.h"
  64 #include "originator.h"
  65 #include "packet.h"
  66 #include "routing.h"
  67 #include "send.h"
  68 #include "translation-table.h"
  69 #include "tvlv.h"
  70
  71 static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work);
  72
  73 /**
  74  * enum batadv_dup_status - duplicate status
  75  * @BATADV_NO_DUP: the packet is no duplicate
  76  * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
  77  *  neighbor)
  78  * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
  79  * @BATADV_PROTECTED: originator is currently protected (after reboot)
  80  */
  81 enum batadv_dup_status {
  82         BATADV_NO_DUP = 0,
  83         BATADV_ORIG_DUP,
  84         BATADV_NEIGH_DUP,
  85         BATADV_PROTECTED,
  86 };
  87
  88 /**
  89  * batadv_ring_buffer_set - update the ring buffer with the given value
  90  * @lq_recv: pointer to the ring buffer
  91  * @lq_index: index to store the value at
  92  * @value: value to store in the ring buffer
  93  */
  94 static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value)
  95 {
  96         lq_recv[*lq_index] = value;
  97         *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
  98 }
  99
 100 /**
 101  * batadv_ring_buffer_avg - compute the average of all non-zero values stored
 102  * in the given ring buffer
 103  * @lq_recv: pointer to the ring buffer
 104  *
 105  * Return: computed average value.
 106  */
 107 static u8 batadv_ring_buffer_avg(const u8 lq_recv[])
 108 {
 109         const u8 *ptr;
 110         u16 count = 0;
 111         u16 i = 0;
 112         u16 sum = 0;
 113
 114         ptr = lq_recv;
 115
 116         while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
 117                 if (*ptr != 0) {
 118                         count++;
 119                         sum += *ptr;
 120                 }
 121
 122                 i++;
 123                 ptr++;
 124         }
 125
 126         if (count == 0)
 127                 return 0;
 128
 129         return (u8)(sum / count);
 130 }
 131
 132 /**
 133  * batadv_iv_ogm_orig_free - free the private resources allocated for this
 134  *  orig_node
 135  * @orig_node: the orig_node for which the resources have to be free'd
 136  */
 137 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
 138 {
 139         kfree(orig_node->bat_iv.bcast_own);
 140         kfree(orig_node->bat_iv.bcast_own_sum);
 141 }
 142
 143 /**
 144  * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
 145  *  include the new hard-interface
 146  * @orig_node: the orig_node that has to be changed
 147  * @max_if_num: the current amount of interfaces
 148  *
 149  * Return: 0 on success, a negative error code otherwise.
 150  */
 151 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
 152                                      int max_if_num)
 153 {
 154         void *data_ptr;
 155         size_t old_size;
 156         int ret = -ENOMEM;
 157
 158         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 159
 160         old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
 161         data_ptr = kmalloc_array(max_if_num,
 162                                  BATADV_NUM_WORDS * sizeof(unsigned long),
 163                                  GFP_ATOMIC);
 164         if (!data_ptr)
 165                 goto unlock;
 166
 167         memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
 168         kfree(orig_node->bat_iv.bcast_own);
 169         orig_node->bat_iv.bcast_own = data_ptr;
 170
 171         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 172         if (!data_ptr)
 173                 goto unlock;
 174
 175         memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
 176                (max_if_num - 1) * sizeof(u8));
 177         kfree(orig_node->bat_iv.bcast_own_sum);
 178         orig_node->bat_iv.bcast_own_sum = data_ptr;
 179
 180         ret = 0;
 181
 182 unlock:
 183         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 184
 185         return ret;
 186 }
 187
 188 /**
 189  * batadv_iv_ogm_drop_bcast_own_entry - drop section of bcast_own
 190  * @orig_node: the orig_node that has to be changed
 191  * @max_if_num: the current amount of interfaces
 192  * @del_if_num: the index of the interface being removed
 193  */
 194 static void
 195 batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node,
 196                                    int max_if_num, int del_if_num)
 197 {
 198         size_t chunk_size;
 199         size_t if_offset;
 200         void *data_ptr;
 201
 202         lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);
 203
 204         chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
 205         data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
 206         if (!data_ptr)
 207                 /* use old buffer when new one could not be allocated */
 208                 data_ptr = orig_node->bat_iv.bcast_own;
 209
 210         /* copy first part */
 211         memmove(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
 212
 213         /* copy second part */
 214         if_offset = (del_if_num + 1) * chunk_size;
 215         memmove((char *)data_ptr + del_if_num * chunk_size,
 216                 (uint8_t *)orig_node->bat_iv.bcast_own + if_offset,
 217                 (max_if_num - del_if_num) * chunk_size);
 218
 219         /* bcast_own was shrunk down in new buffer; free old one */
 220         if (orig_node->bat_iv.bcast_own != data_ptr) {
 221                 kfree(orig_node->bat_iv.bcast_own);
 222                 orig_node->bat_iv.bcast_own = data_ptr;
 223         }
 224 }
 225
 226 /**
 227  * batadv_iv_ogm_drop_bcast_own_sum_entry - drop section of bcast_own_sum
 228  * @orig_node: the orig_node that has to be changed
 229  * @max_if_num: the current amount of interfaces
 230  * @del_if_num: the index of the interface being removed
 231  */
 232 static void
 233 batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node,
 234                                        int max_if_num, int del_if_num)
 235 {
 236         size_t if_offset;
 237         void *data_ptr;
 238
 239         lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);
 240
 241         data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
 242         if (!data_ptr)
 243                 /* use old buffer when new one could not be allocated */
 244                 data_ptr = orig_node->bat_iv.bcast_own_sum;
 245
 246         memmove(data_ptr, orig_node->bat_iv.bcast_own_sum,
 247                 del_if_num * sizeof(u8));
 248
 249         if_offset = (del_if_num + 1) * sizeof(u8);
 250         memmove((char *)data_ptr + del_if_num * sizeof(u8),
 251                 orig_node->bat_iv.bcast_own_sum + if_offset,
 252                 (max_if_num - del_if_num) * sizeof(u8));
 253
 254         /* bcast_own_sum was shrunk down in new buffer; free old one */
 255         if (orig_node->bat_iv.bcast_own_sum != data_ptr) {
 256                 kfree(orig_node->bat_iv.bcast_own_sum);
 257                 orig_node->bat_iv.bcast_own_sum = data_ptr;
 258         }
 259 }
 260
 261 /**
 262  * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
 263  *  exclude the removed interface
 264  * @orig_node: the orig_node that has to be changed
 265  * @max_if_num: the current amount of interfaces
 266  * @del_if_num: the index of the interface being removed
 267  *
 268  * Return: 0 on success, a negative error code otherwise.
 269  */
 270 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
 271                                      int max_if_num, int del_if_num)
 272 {
 273         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 274
 275         if (max_if_num == 0) {
 276                 kfree(orig_node->bat_iv.bcast_own);
 277                 kfree(orig_node->bat_iv.bcast_own_sum);
 278                 orig_node->bat_iv.bcast_own = NULL;
 279                 orig_node->bat_iv.bcast_own_sum = NULL;
 280         } else {
 281                 batadv_iv_ogm_drop_bcast_own_entry(orig_node, max_if_num,
 282                                                    del_if_num);
 283                 batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node, max_if_num,
 284                                                        del_if_num);
 285         }
 286
 287         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 288
 289         return 0;
 290 }
 291
 292 /**
 293  * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
 294  * @bat_priv: the bat priv with all the soft interface information
 295  * @addr: mac address of the originator
 296  *
 297  * Return: the originator object corresponding to the passed mac address or NULL
 298  * on failure.
 299  * If the object does not exists it is created an initialised.
 300  */
 301 static struct batadv_orig_node *
 302 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr)
 303 {
 304         struct batadv_orig_node *orig_node;
 305         int size, hash_added;
 306
 307         orig_node = batadv_orig_hash_find(bat_priv, addr);
 308         if (orig_node)
 309                 return orig_node;
 310
 311         orig_node = batadv_orig_node_new(bat_priv, addr);
 312         if (!orig_node)
 313                 return NULL;
 314
 315         spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
 316
 317         size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
 318         orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
 319         if (!orig_node->bat_iv.bcast_own)
 320                 goto free_orig_node;
 321
 322         size = bat_priv->num_ifaces * sizeof(u8);
 323         orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 324         if (!orig_node->bat_iv.bcast_own_sum)
 325                 goto free_orig_node;
 326
 327         kref_get(&orig_node->refcount);
 328         hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
 329                                      batadv_choose_orig, orig_node,
 330                                      &orig_node->hash_entry);
 331         if (hash_added != 0)
 332                 goto free_orig_node_hash;
 333
 334         return orig_node;
 335
 336 free_orig_node_hash:
 337         batadv_orig_node_put(orig_node);
 338 free_orig_node:
 339         batadv_orig_node_put(orig_node);
 340
 341         return NULL;
 342 }
 343
 344 static struct batadv_neigh_node *
 345 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
 346                         const u8 *neigh_addr,
 347                         struct batadv_orig_node *orig_node,
 348                         struct batadv_orig_node *orig_neigh)
 349 {
 350         struct batadv_neigh_node *neigh_node;
 351
 352         neigh_node = batadv_neigh_node_get_or_create(orig_node,
 353                                                      hard_iface, neigh_addr);
 354         if (!neigh_node)
 355                 goto out;
 356
 357         neigh_node->orig_node = orig_neigh;
 358
 359 out:
 360         return neigh_node;
 361 }
 362
 363 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
 364 {
 365         struct batadv_ogm_packet *batadv_ogm_packet;
 366         unsigned char *ogm_buff;
 367         u32 random_seqno;
 368
 369         /* randomize initial seqno to avoid collision */
 370         get_random_bytes(&random_seqno, sizeof(random_seqno));
 371         atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
 372
 373         hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
 374         ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
 375         if (!ogm_buff)
 376                 return -ENOMEM;
 377
 378         hard_iface->bat_iv.ogm_buff = ogm_buff;
 379
 380         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 381         batadv_ogm_packet->packet_type = BATADV_IV_OGM;
 382         batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
 383         batadv_ogm_packet->ttl = 2;
 384         batadv_ogm_packet->flags = BATADV_NO_FLAGS;
 385         batadv_ogm_packet->reserved = 0;
 386         batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
 387
 388         return 0;
 389 }
 390
 391 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 392 {
 393         kfree(hard_iface->bat_iv.ogm_buff);
 394         hard_iface->bat_iv.ogm_buff = NULL;
 395 }
 396
 397 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 398 {
 399         struct batadv_ogm_packet *batadv_ogm_packet;
 400         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 401
 402         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 403         ether_addr_copy(batadv_ogm_packet->orig,
 404                         hard_iface->net_dev->dev_addr);
 405         ether_addr_copy(batadv_ogm_packet->prev_sender,
 406                         hard_iface->net_dev->dev_addr);
 407 }
 408
 409 static void
 410 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 411 {
 412         struct batadv_ogm_packet *batadv_ogm_packet;
 413         unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 414
 415         batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
 416         batadv_ogm_packet->ttl = BATADV_TTL;
 417 }
 418
 419 /* when do we schedule our own ogm to be sent */
 420 static unsigned long
 421 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 422 {
 423         unsigned int msecs;
 424
 425         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 426         msecs += prandom_u32() % (2 * BATADV_JITTER);
 427
 428         return jiffies + msecs_to_jiffies(msecs);
 429 }
 430
 431 /* when do we schedule a ogm packet to be sent */
 432 static unsigned long batadv_iv_ogm_fwd_send_time(void)
 433 {
 434         return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
 435 }
 436
 437 /* apply hop penalty for a normal link */
 438 static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv)
 439 {
 440         int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 441         int new_tq;
 442
 443         new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 444         new_tq /= BATADV_TQ_MAX_VALUE;
 445
 446         return new_tq;
 447 }
 448
 449 /**
 450  * batadv_iv_ogm_aggr_packet - checks if there is another OGM attached
 451  * @buff_pos: current position in the skb
 452  * @packet_len: total length of the skb
 453  * @tvlv_len: tvlv length of the previously considered OGM
 454  *
 455  * Return: true if there is enough space for another OGM, false otherwise.
 456  */
 457 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 458                                       __be16 tvlv_len)
 459 {
 460         int next_buff_pos = 0;
 461
 462         next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 463         next_buff_pos += ntohs(tvlv_len);
 464
 465         return (next_buff_pos <= packet_len) &&
 466                (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 467 }
 468
 469 /* send a batman ogm to a given interface */
 470 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 471                                      struct batadv_hard_iface *hard_iface)
 472 {
 473         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 474         const char *fwd_str;
 475         u8 packet_num;
 476         s16 buff_pos;
 477         struct batadv_ogm_packet *batadv_ogm_packet;
 478         struct sk_buff *skb;
 479         u8 *packet_pos;
 480
 481         if (hard_iface->if_status != BATADV_IF_ACTIVE)
 482                 return;
 483
 484         packet_num = 0;
 485         buff_pos = 0;
 486         packet_pos = forw_packet->skb->data;
 487         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 488
 489         /* adjust all flags and log packets */
 490         while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 491                                          batadv_ogm_packet->tvlv_len)) {
 492                 /* we might have aggregated direct link packets with an
 493                  * ordinary base packet
 494                  */
 495                 if (forw_packet->direct_link_flags & BIT(packet_num) &&
 496                     forw_packet->if_incoming == hard_iface)
 497                         batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 498                 else
 499                         batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 500
 501                 if (packet_num > 0 || !forw_packet->own)
 502                         fwd_str = "Forwarding";
 503                 else
 504                         fwd_str = "Sending own";
 505
 506                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 507                            "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
 508                            fwd_str, (packet_num > 0 ? "aggregated " : ""),
 509                            batadv_ogm_packet->orig,
 510                            ntohl(batadv_ogm_packet->seqno),
 511                            batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
 512                            ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ?
 513                             "on" : "off"),
 514                            hard_iface->net_dev->name,
 515                            hard_iface->net_dev->dev_addr);
 516
 517                 buff_pos += BATADV_OGM_HLEN;
 518                 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
 519                 packet_num++;
 520                 packet_pos = forw_packet->skb->data + buff_pos;
 521                 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 522         }
 523
 524         /* create clone because function is called more than once */
 525         skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 526         if (skb) {
 527                 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 528                 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 529                                    skb->len + ETH_HLEN);
 530                 batadv_send_broadcast_skb(skb, hard_iface);
 531         }
 532 }
 533
 534 /* send a batman ogm packet */
 535 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 536 {
 537         struct net_device *soft_iface;
 538
 539         if (!forw_packet->if_incoming) {
 540                 pr_err("Error - can't forward packet: incoming iface not specified\n");
 541                 return;
 542         }
 543
 544         soft_iface = forw_packet->if_incoming->soft_iface;
 545
 546         if (WARN_ON(!forw_packet->if_outgoing))
 547                 return;
 548
 549         if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
 550                 return;
 551
 552         if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 553                 return;
 554
 555         /* only for one specific outgoing interface */
 556         batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
 557 }
 558
 559 /**
 560  * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
 561  *  existing forward packet
 562  * @new_bat_ogm_packet: OGM packet to be aggregated
 563  * @bat_priv: the bat priv with all the soft interface information
 564  * @packet_len: (total) length of the OGM
 565  * @send_time: timestamp (jiffies) when the packet is to be sent
 566  * @directlink: true if this is a direct link packet
 567  * @if_incoming: interface where the packet was received
 568  * @if_outgoing: interface for which the retransmission should be considered
 569  * @forw_packet: the forwarded packet which should be checked
 570  *
 571  * Return: true if new_packet can be aggregated with forw_packet
 572  */
 573 static bool
 574 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 575                             struct batadv_priv *bat_priv,
 576                             int packet_len, unsigned long send_time,
 577                             bool directlink,
 578                             const struct batadv_hard_iface *if_incoming,
 579                             const struct batadv_hard_iface *if_outgoing,
 580                             const struct batadv_forw_packet *forw_packet)
 581 {
 582         struct batadv_ogm_packet *batadv_ogm_packet;
 583         int aggregated_bytes = forw_packet->packet_len + packet_len;
 584         struct batadv_hard_iface *primary_if = NULL;
 585         bool res = false;
 586         unsigned long aggregation_end_time;
 587
 588         batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 589         aggregation_end_time = send_time;
 590         aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 591
 592         /* we can aggregate the current packet to this aggregated packet
 593          * if:
 594          *
 595          * - the send time is within our MAX_AGGREGATION_MS time
 596          * - the resulting packet wont be bigger than
 597          *   MAX_AGGREGATION_BYTES
 598          * otherwise aggregation is not possible
 599          */
 600         if (!time_before(send_time, forw_packet->send_time) ||
 601             !time_after_eq(aggregation_end_time, forw_packet->send_time))
 602                 return false;
 603
 604         if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
 605                 return false;
 606
 607         /* packet is not leaving on the same interface. */
 608         if (forw_packet->if_outgoing != if_outgoing)
 609                 return false;
 610
 611         /* check aggregation compatibility
 612          * -> direct link packets are broadcasted on
 613          *    their interface only
 614          * -> aggregate packet if the current packet is
 615          *    a "global" packet as well as the base
 616          *    packet
 617          */
 618         primary_if = batadv_primary_if_get_selected(bat_priv);
 619         if (!primary_if)
 620                 return false;
 621
 622         /* packets without direct link flag and high TTL
 623          * are flooded through the net
 624          */
 625         if (!directlink &&
 626             !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) &&
 627             batadv_ogm_packet->ttl != 1 &&
 628
 629             /* own packets originating non-primary
 630              * interfaces leave only that interface
 631              */
 632             (!forw_packet->own ||
 633              forw_packet->if_incoming == primary_if)) {
 634                 res = true;
 635                 goto out;
 636         }
 637
 638         /* if the incoming packet is sent via this one
 639          * interface only - we still can aggregate
 640          */
 641         if (directlink &&
 642             new_bat_ogm_packet->ttl == 1 &&
 643             forw_packet->if_incoming == if_incoming &&
 644
 645             /* packets from direct neighbors or
 646              * own secondary interface packets
 647              * (= secondary interface packets in general)
 648              */
 649             (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 650              (forw_packet->own &&
 651               forw_packet->if_incoming != primary_if))) {
 652                 res = true;
 653                 goto out;
 654         }
 655
 656 out:
 657         if (primary_if)
 658                 batadv_hardif_put(primary_if);
 659         return res;
 660 }
 661
 662 /**
 663  * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
 664  *  packet to it.
 665  * @packet_buff: pointer to the OGM
 666  * @packet_len: (total) length of the OGM
 667  * @send_time: timestamp (jiffies) when the packet is to be sent
 668  * @direct_link: whether this OGM has direct link status
 669  * @if_incoming: interface where the packet was received
 670  * @if_outgoing: interface for which the retransmission should be considered
 671  * @own_packet: true if it is a self-generated ogm
 672  */
 673 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 674                                         int packet_len, unsigned long send_time,
 675                                         bool direct_link,
 676                                         struct batadv_hard_iface *if_incoming,
 677                                         struct batadv_hard_iface *if_outgoing,
 678                                         int own_packet)
 679 {
 680         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 681         struct batadv_forw_packet *forw_packet_aggr;
 682         struct sk_buff *skb;
 683         unsigned char *skb_buff;
 684         unsigned int skb_size;
 685         atomic_t *queue_left = own_packet ? NULL : &bat_priv->batman_queue_left;
 686
 687         if (atomic_read(&bat_priv->aggregated_ogms) &&
 688             packet_len < BATADV_MAX_AGGREGATION_BYTES)
 689                 skb_size = BATADV_MAX_AGGREGATION_BYTES;
 690         else
 691                 skb_size = packet_len;
 692
 693         skb_size += ETH_HLEN;
 694
 695         skb = netdev_alloc_skb_ip_align(NULL, skb_size);
 696         if (!skb)
 697                 return;
 698
 699         forw_packet_aggr = batadv_forw_packet_alloc(if_incoming, if_outgoing,
 700                                                     queue_left, bat_priv, skb);
 701         if (!forw_packet_aggr) {
 702                 kfree_skb(skb);
 703                 return;
 704         }
 705
 706         forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
 707         skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 708
 709         skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 710         forw_packet_aggr->packet_len = packet_len;
 711         memcpy(skb_buff, packet_buff, packet_len);
 712
 713         forw_packet_aggr->own = own_packet;
 714         forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 715         forw_packet_aggr->send_time = send_time;
 716
 717         /* save packet direct link flag status */
 718         if (direct_link)
 719                 forw_packet_aggr->direct_link_flags |= 1;
 720
 721         INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 722                           batadv_iv_send_outstanding_bat_ogm_packet);
 723
 724         batadv_forw_packet_ogmv1_queue(bat_priv, forw_packet_aggr, send_time);
 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 long new_direct_link_flag;
 733
 734         skb_put_data(forw_packet_aggr->skb, packet_buff, packet_len);
 735         forw_packet_aggr->packet_len += packet_len;
 736         forw_packet_aggr->num_packets++;
 737
 738         /* save packet direct link flag status */
 739         if (direct_link) {
 740                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 741                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 742         }
 743 }
 744
 745 /**
 746  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 747  * @bat_priv: the bat priv with all the soft interface information
 748  * @packet_buff: pointer to the OGM
 749  * @packet_len: (total) length of the OGM
 750  * @if_incoming: interface where the packet was received
 751  * @if_outgoing: interface for which the retransmission should be considered
 752  * @own_packet: true if it is a self-generated ogm
 753  * @send_time: timestamp (jiffies) when the packet is to be sent
 754  */
 755 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 756                                     unsigned char *packet_buff,
 757                                     int packet_len,
 758                                     struct batadv_hard_iface *if_incoming,
 759                                     struct batadv_hard_iface *if_outgoing,
 760                                     int own_packet, unsigned long send_time)
 761 {
 762         /* _aggr -> pointer to the packet we want to aggregate with
 763          * _pos -> pointer to the position in the queue
 764          */
 765         struct batadv_forw_packet *forw_packet_aggr = NULL;
 766         struct batadv_forw_packet *forw_packet_pos = NULL;
 767         struct batadv_ogm_packet *batadv_ogm_packet;
 768         bool direct_link;
 769         unsigned long max_aggregation_jiffies;
 770
 771         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 772         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 773         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 774
 775         /* find position for the packet in the forward queue */
 776         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 777         /* own packets are not to be aggregated */
 778         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 779                 hlist_for_each_entry(forw_packet_pos,
 780                                      &bat_priv->forw_bat_list, list) {
 781                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 782                                                         bat_priv, packet_len,
 783                                                         send_time, direct_link,
 784                                                         if_incoming,
 785                                                         if_outgoing,
 786                                                         forw_packet_pos)) {
 787                                 forw_packet_aggr = forw_packet_pos;
 788                                 break;
 789                         }
 790                 }
 791         }
 792
 793         /* nothing to aggregate with - either aggregation disabled or no
 794          * suitable aggregation packet found
 795          */
 796         if (!forw_packet_aggr) {
 797                 /* the following section can run without the lock */
 798                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 799
 800                 /* if we could not aggregate this packet with one of the others
 801                  * we hold it back for a while, so that it might be aggregated
 802                  * later on
 803                  */
 804                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 805                         send_time += max_aggregation_jiffies;
 806
 807                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 808                                             send_time, direct_link,
 809                                             if_incoming, if_outgoing,
 810                                             own_packet);
 811         } else {
 812                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 813                                         packet_len, direct_link);
 814                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 815         }
 816 }
 817
 818 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 819                                   const struct ethhdr *ethhdr,
 820                                   struct batadv_ogm_packet *batadv_ogm_packet,
 821                                   bool is_single_hop_neigh,
 822                                   bool is_from_best_next_hop,
 823                                   struct batadv_hard_iface *if_incoming,
 824                                   struct batadv_hard_iface *if_outgoing)
 825 {
 826         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 827         u16 tvlv_len;
 828
 829         if (batadv_ogm_packet->ttl <= 1) {
 830                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 831                 return;
 832         }
 833
 834         if (!is_from_best_next_hop) {
 835                 /* Mark the forwarded packet when it is not coming from our
 836                  * best next hop. We still need to forward the packet for our
 837                  * neighbor link quality detection to work in case the packet
 838                  * originated from a single hop neighbor. Otherwise we can
 839                  * simply drop the ogm.
 840                  */
 841                 if (is_single_hop_neigh)
 842                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 843                 else
 844                         return;
 845         }
 846
 847         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 848
 849         batadv_ogm_packet->ttl--;
 850         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 851
 852         /* apply hop penalty */
 853         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 854                                                    bat_priv);
 855
 856         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 857                    "Forwarding packet: tq: %i, ttl: %i\n",
 858                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 859
 860         if (is_single_hop_neigh)
 861                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 862         else
 863                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 864
 865         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 866                                 BATADV_OGM_HLEN + tvlv_len,
 867                                 if_incoming, if_outgoing, 0,
 868                                 batadv_iv_ogm_fwd_send_time());
 869 }
 870
 871 /**
 872  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 873  * the given interface
 874  * @hard_iface: the interface for which the windows have to be shifted
 875  */
 876 static void
 877 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 878 {
 879         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 880         struct batadv_hashtable *hash = bat_priv->orig_hash;
 881         struct hlist_head *head;
 882         struct batadv_orig_node *orig_node;
 883         unsigned long *word;
 884         u32 i;
 885         size_t word_index;
 886         u8 *w;
 887         int if_num;
 888
 889         for (i = 0; i < hash->size; i++) {
 890                 head = &hash->table[i];
 891
 892                 rcu_read_lock();
 893                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 894                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 895                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 896                         word = &orig_node->bat_iv.bcast_own[word_index];
 897
 898                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 899                         if_num = hard_iface->if_num;
 900                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 901                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 902                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 903                 }
 904                 rcu_read_unlock();
 905         }
 906 }
 907
 908 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 909 {
 910         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 911         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 912         struct batadv_ogm_packet *batadv_ogm_packet;
 913         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 914         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 915         u32 seqno;
 916         u16 tvlv_len = 0;
 917         unsigned long send_time;
 918
 919         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE ||
 920             hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)
 921                 return;
 922
 923         /* the interface gets activated here to avoid race conditions between
 924          * the moment of activating the interface in
 925          * hardif_activate_interface() where the originator mac is set and
 926          * outdated packets (especially uninitialized mac addresses) in the
 927          * packet queue
 928          */
 929         if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
 930                 hard_iface->if_status = BATADV_IF_ACTIVE;
 931
 932         primary_if = batadv_primary_if_get_selected(bat_priv);
 933
 934         if (hard_iface == primary_if) {
 935                 /* tt changes have to be committed before the tvlv data is
 936                  * appended as it may alter the tt tvlv container
 937                  */
 938                 batadv_tt_local_commit_changes(bat_priv);
 939                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 940                                                             ogm_buff_len,
 941                                                             BATADV_OGM_HLEN);
 942         }
 943
 944         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 945         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 946
 947         /* change sequence number to network order */
 948         seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 949         batadv_ogm_packet->seqno = htonl(seqno);
 950         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 951
 952         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 953
 954         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 955
 956         if (hard_iface != primary_if) {
 957                 /* OGMs from secondary interfaces are only scheduled on their
 958                  * respective interfaces.
 959                  */
 960                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 961                                         hard_iface, hard_iface, 1, send_time);
 962                 goto out;
 963         }
 964
 965         /* OGMs from primary interfaces are scheduled on all
 966          * interfaces.
 967          */
 968         rcu_read_lock();
 969         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 970                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 971                         continue;
 972
 973                 if (!kref_get_unless_zero(&tmp_hard_iface->refcount))
 974                         continue;
 975
 976                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 977                                         *ogm_buff_len, hard_iface,
 978                                         tmp_hard_iface, 1, send_time);
 979
 980                 batadv_hardif_put(tmp_hard_iface);
 981         }
 982         rcu_read_unlock();
 983
 984 out:
 985         if (primary_if)
 986                 batadv_hardif_put(primary_if);
 987 }
 988
 989 /**
 990  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
 991  *  originator
 992  * @bat_priv: the bat priv with all the soft interface information
 993  * @orig_node: the orig node who originally emitted the ogm packet
 994  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
 995  * @ethhdr: Ethernet header of the OGM
 996  * @batadv_ogm_packet: the ogm packet
 997  * @if_incoming: interface where the packet was received
 998  * @if_outgoing: interface for which the retransmission should be considered
 999  * @dup_status: the duplicate status of this ogm packet.
1000  */
1001 static void
1002 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
1003                           struct batadv_orig_node *orig_node,
1004                           struct batadv_orig_ifinfo *orig_ifinfo,
1005                           const struct ethhdr *ethhdr,
1006                           const struct batadv_ogm_packet *batadv_ogm_packet,
1007                           struct batadv_hard_iface *if_incoming,
1008                           struct batadv_hard_iface *if_outgoing,
1009                           enum batadv_dup_status dup_status)
1010 {
1011         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
1012         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1013         struct batadv_neigh_node *neigh_node = NULL;
1014         struct batadv_neigh_node *tmp_neigh_node = NULL;
1015         struct batadv_neigh_node *router = NULL;
1016         struct batadv_orig_node *orig_node_tmp;
1017         int if_num;
1018         u8 sum_orig, sum_neigh;
1019         u8 *neigh_addr;
1020         u8 tq_avg;
1021
1022         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1023                    "%s(): Searching and updating originator entry of received packet\n",
1024                    __func__);
1025
1026         rcu_read_lock();
1027         hlist_for_each_entry_rcu(tmp_neigh_node,
1028                                  &orig_node->neigh_list, list) {
1029                 neigh_addr = tmp_neigh_node->addr;
1030                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1031                     tmp_neigh_node->if_incoming == if_incoming &&
1032                     kref_get_unless_zero(&tmp_neigh_node->refcount)) {
1033                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1034                                 batadv_neigh_node_put(neigh_node);
1035                         neigh_node = tmp_neigh_node;
1036                         continue;
1037                 }
1038
1039                 if (dup_status != BATADV_NO_DUP)
1040                         continue;
1041
1042                 /* only update the entry for this outgoing interface */
1043                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1044                                                        if_outgoing);
1045                 if (!neigh_ifinfo)
1046                         continue;
1047
1048                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1049                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1050                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1051                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1052                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1053                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1054
1055                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1056                 neigh_ifinfo = NULL;
1057         }
1058
1059         if (!neigh_node) {
1060                 struct batadv_orig_node *orig_tmp;
1061
1062                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1063                 if (!orig_tmp)
1064                         goto unlock;
1065
1066                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1067                                                      ethhdr->h_source,
1068                                                      orig_node, orig_tmp);
1069
1070                 batadv_orig_node_put(orig_tmp);
1071                 if (!neigh_node)
1072                         goto unlock;
1073         } else {
1074                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1075                            "Updating existing last-hop neighbor of originator\n");
1076         }
1077
1078         rcu_read_unlock();
1079         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1080         if (!neigh_ifinfo)
1081                 goto out;
1082
1083         neigh_node->last_seen = jiffies;
1084
1085         spin_lock_bh(&neigh_node->ifinfo_lock);
1086         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1087                                &neigh_ifinfo->bat_iv.tq_index,
1088                                batadv_ogm_packet->tq);
1089         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1090         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1091         spin_unlock_bh(&neigh_node->ifinfo_lock);
1092
1093         if (dup_status == BATADV_NO_DUP) {
1094                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1095                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1096         }
1097
1098         /* if this neighbor already is our next hop there is nothing
1099          * to change
1100          */
1101         router = batadv_orig_router_get(orig_node, if_outgoing);
1102         if (router == neigh_node)
1103                 goto out;
1104
1105         if (router) {
1106                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1107                 if (!router_ifinfo)
1108                         goto out;
1109
1110                 /* if this neighbor does not offer a better TQ we won't
1111                  * consider it
1112                  */
1113                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1114                         goto out;
1115         }
1116
1117         /* if the TQ is the same and the link not more symmetric we
1118          * won't consider it either
1119          */
1120         if (router_ifinfo &&
1121             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1122                 orig_node_tmp = router->orig_node;
1123                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1124                 if_num = router->if_incoming->if_num;
1125                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1126                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1127
1128                 orig_node_tmp = neigh_node->orig_node;
1129                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1130                 if_num = neigh_node->if_incoming->if_num;
1131                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1132                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1133
1134                 if (sum_orig >= sum_neigh)
1135                         goto out;
1136         }
1137
1138         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1139         goto out;
1140
1141 unlock:
1142         rcu_read_unlock();
1143 out:
1144         if (neigh_node)
1145                 batadv_neigh_node_put(neigh_node);
1146         if (router)
1147                 batadv_neigh_node_put(router);
1148         if (neigh_ifinfo)
1149                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1150         if (router_ifinfo)
1151                 batadv_neigh_ifinfo_put(router_ifinfo);
1152 }
1153
1154 /**
1155  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1156  * @orig_node: the orig node who originally emitted the ogm packet
1157  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1158  * @batadv_ogm_packet: the ogm packet
1159  * @if_incoming: interface where the packet was received
1160  * @if_outgoing: interface for which the retransmission should be considered
1161  *
1162  * Return: true if the link can be considered bidirectional, false otherwise
1163  */
1164 static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1165                                   struct batadv_orig_node *orig_neigh_node,
1166                                   struct batadv_ogm_packet *batadv_ogm_packet,
1167                                   struct batadv_hard_iface *if_incoming,
1168                                   struct batadv_hard_iface *if_outgoing)
1169 {
1170         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1171         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1172         struct batadv_neigh_ifinfo *neigh_ifinfo;
1173         u8 total_count;
1174         u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1175         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1176         int if_num;
1177         unsigned int tq_asym_penalty, inv_asym_penalty;
1178         unsigned int combined_tq;
1179         unsigned int tq_iface_penalty;
1180         bool ret = false;
1181
1182         /* find corresponding one hop neighbor */
1183         rcu_read_lock();
1184         hlist_for_each_entry_rcu(tmp_neigh_node,
1185                                  &orig_neigh_node->neigh_list, list) {
1186                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1187                                         orig_neigh_node->orig))
1188                         continue;
1189
1190                 if (tmp_neigh_node->if_incoming != if_incoming)
1191                         continue;
1192
1193                 if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
1194                         continue;
1195
1196                 neigh_node = tmp_neigh_node;
1197                 break;
1198         }
1199         rcu_read_unlock();
1200
1201         if (!neigh_node)
1202                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1203                                                      orig_neigh_node->orig,
1204                                                      orig_neigh_node,
1205                                                      orig_neigh_node);
1206
1207         if (!neigh_node)
1208                 goto out;
1209
1210         /* if orig_node is direct neighbor update neigh_node last_seen */
1211         if (orig_node == orig_neigh_node)
1212                 neigh_node->last_seen = jiffies;
1213
1214         orig_node->last_seen = jiffies;
1215
1216         /* find packet count of corresponding one hop neighbor */
1217         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1218         if_num = if_incoming->if_num;
1219         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1220         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1221         if (neigh_ifinfo) {
1222                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1223                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1224         } else {
1225                 neigh_rq_count = 0;
1226         }
1227         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1228
1229         /* pay attention to not get a value bigger than 100 % */
1230         if (orig_eq_count > neigh_rq_count)
1231                 total_count = neigh_rq_count;
1232         else
1233                 total_count = orig_eq_count;
1234
1235         /* if we have too few packets (too less data) we set tq_own to zero
1236          * if we receive too few packets it is not considered bidirectional
1237          */
1238         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1239             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1240                 tq_own = 0;
1241         else
1242                 /* neigh_node->real_packet_count is never zero as we
1243                  * only purge old information when getting new
1244                  * information
1245                  */
1246                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1247
1248         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1249          * affect the nearly-symmetric links only a little, but
1250          * punishes asymmetric links more.  This will give a value
1251          * between 0 and TQ_MAX_VALUE
1252          */
1253         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1254         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1255         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1256                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1257                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1258         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1259         inv_asym_penalty /= neigh_rq_max_cube;
1260         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1261
1262         /* penalize if the OGM is forwarded on the same interface. WiFi
1263          * interfaces and other half duplex devices suffer from throughput
1264          * drops as they can't send and receive at the same time.
1265          */
1266         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1267         if (if_outgoing && if_incoming == if_outgoing &&
1268             batadv_is_wifi_hardif(if_outgoing))
1269                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1270                                                       bat_priv);
1271
1272         combined_tq = batadv_ogm_packet->tq *
1273                       tq_own *
1274                       tq_asym_penalty *
1275                       tq_iface_penalty;
1276         combined_tq /= BATADV_TQ_MAX_VALUE *
1277                        BATADV_TQ_MAX_VALUE *
1278                        BATADV_TQ_MAX_VALUE;
1279         batadv_ogm_packet->tq = combined_tq;
1280
1281         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1282                    "bidirectional: orig = %pM neigh = %pM => 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",
1283                    orig_node->orig, orig_neigh_node->orig, total_count,
1284                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1285                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1286                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1287
1288         /* if link has the minimum required transmission quality
1289          * consider it bidirectional
1290          */
1291         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1292                 ret = true;
1293
1294 out:
1295         if (neigh_node)
1296                 batadv_neigh_node_put(neigh_node);
1297         return ret;
1298 }
1299
1300 /**
1301  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1302  *  adjust the sequence number and find out whether it is a duplicate
1303  * @ethhdr: ethernet header of the packet
1304  * @batadv_ogm_packet: OGM packet to be considered
1305  * @if_incoming: interface on which the OGM packet was received
1306  * @if_outgoing: interface for which the retransmission should be considered
1307  *
1308  * Return: duplicate status as enum batadv_dup_status
1309  */
1310 static enum batadv_dup_status
1311 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1312                             const struct batadv_ogm_packet *batadv_ogm_packet,
1313                             const struct batadv_hard_iface *if_incoming,
1314                             struct batadv_hard_iface *if_outgoing)
1315 {
1316         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1317         struct batadv_orig_node *orig_node;
1318         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1319         struct batadv_neigh_node *neigh_node;
1320         struct batadv_neigh_ifinfo *neigh_ifinfo;
1321         bool is_dup;
1322         s32 seq_diff;
1323         bool need_update = false;
1324         int set_mark;
1325         enum batadv_dup_status ret = BATADV_NO_DUP;
1326         u32 seqno = ntohl(batadv_ogm_packet->seqno);
1327         u8 *neigh_addr;
1328         u8 packet_count;
1329         unsigned long *bitmap;
1330
1331         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1332         if (!orig_node)
1333                 return BATADV_NO_DUP;
1334
1335         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1336         if (WARN_ON(!orig_ifinfo)) {
1337                 batadv_orig_node_put(orig_node);
1338                 return 0;
1339         }
1340
1341         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1342         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1343
1344         /* signalize caller that the packet is to be dropped. */
1345         if (!hlist_empty(&orig_node->neigh_list) &&
1346             batadv_window_protected(bat_priv, seq_diff,
1347                                     BATADV_TQ_LOCAL_WINDOW_SIZE,
1348                                     &orig_ifinfo->batman_seqno_reset, NULL)) {
1349                 ret = BATADV_PROTECTED;
1350                 goto out;
1351         }
1352
1353         rcu_read_lock();
1354         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1355                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1356                                                        if_outgoing);
1357                 if (!neigh_ifinfo)
1358                         continue;
1359
1360                 neigh_addr = neigh_node->addr;
1361                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1362                                          orig_ifinfo->last_real_seqno,
1363                                          seqno);
1364
1365                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1366                     neigh_node->if_incoming == if_incoming) {
1367                         set_mark = 1;
1368                         if (is_dup)
1369                                 ret = BATADV_NEIGH_DUP;
1370                 } else {
1371                         set_mark = 0;
1372                         if (is_dup && ret != BATADV_NEIGH_DUP)
1373                                 ret = BATADV_ORIG_DUP;
1374                 }
1375
1376                 /* if the window moved, set the update flag. */
1377                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1378                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1379                                                      seq_diff, set_mark);
1380
1381                 packet_count = bitmap_weight(bitmap,
1382                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1383                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1384                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1385         }
1386         rcu_read_unlock();
1387
1388         if (need_update) {
1389                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1390                            "%s updating last_seqno: old %u, new %u\n",
1391                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1392                            orig_ifinfo->last_real_seqno, seqno);
1393                 orig_ifinfo->last_real_seqno = seqno;
1394         }
1395
1396 out:
1397         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1398         batadv_orig_node_put(orig_node);
1399         batadv_orig_ifinfo_put(orig_ifinfo);
1400         return ret;
1401 }
1402
1403 /**
1404  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1405  * @skb: the skb containing the OGM
1406  * @ogm_offset: offset from skb->data to start of ogm header
1407  * @orig_node: the (cached) orig node for the originator of this OGM
1408  * @if_incoming: the interface where this packet was received
1409  * @if_outgoing: the interface for which the packet should be considered
1410  */
1411 static void
1412 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1413                                 struct batadv_orig_node *orig_node,
1414                                 struct batadv_hard_iface *if_incoming,
1415                                 struct batadv_hard_iface *if_outgoing)
1416 {
1417         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1418         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
1419         struct batadv_neigh_node *router = NULL;
1420         struct batadv_neigh_node *router_router = NULL;
1421         struct batadv_orig_node *orig_neigh_node;
1422         struct batadv_orig_ifinfo *orig_ifinfo;
1423         struct batadv_neigh_node *orig_neigh_router = NULL;
1424         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1425         struct batadv_ogm_packet *ogm_packet;
1426         enum batadv_dup_status dup_status;
1427         bool is_from_best_next_hop = false;
1428         bool is_single_hop_neigh = false;
1429         bool sameseq, similar_ttl;
1430         struct sk_buff *skb_priv;
1431         struct ethhdr *ethhdr;
1432         u8 *prev_sender;
1433         bool is_bidirect;
1434
1435         /* create a private copy of the skb, as some functions change tq value
1436          * and/or flags.
1437          */
1438         skb_priv = skb_copy(skb, GFP_ATOMIC);
1439         if (!skb_priv)
1440                 return;
1441
1442         ethhdr = eth_hdr(skb_priv);
1443         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1444
1445         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1446                                                  if_incoming, if_outgoing);
1447         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1448                 is_single_hop_neigh = true;
1449
1450         if (dup_status == BATADV_PROTECTED) {
1451                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1452                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1453                            ethhdr->h_source);
1454                 goto out;
1455         }
1456
1457         if (ogm_packet->tq == 0) {
1458                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1459                            "Drop packet: originator packet with tq equal 0\n");
1460                 goto out;
1461         }
1462
1463         if (is_single_hop_neigh) {
1464                 hardif_neigh = batadv_hardif_neigh_get(if_incoming,
1465                                                        ethhdr->h_source);
1466                 if (hardif_neigh)
1467                         hardif_neigh->last_seen = jiffies;
1468         }
1469
1470         router = batadv_orig_router_get(orig_node, if_outgoing);
1471         if (router) {
1472                 router_router = batadv_orig_router_get(router->orig_node,
1473                                                        if_outgoing);
1474                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1475         }
1476
1477         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1478             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1479                 is_from_best_next_hop = true;
1480
1481         prev_sender = ogm_packet->prev_sender;
1482         /* avoid temporary routing loops */
1483         if (router && router_router &&
1484             (batadv_compare_eth(router->addr, prev_sender)) &&
1485             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1486             (batadv_compare_eth(router->addr, router_router->addr))) {
1487                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1488                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1489                            ethhdr->h_source);
1490                 goto out;
1491         }
1492
1493         if (if_outgoing == BATADV_IF_DEFAULT)
1494                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1495
1496         /* if sender is a direct neighbor the sender mac equals
1497          * originator mac
1498          */
1499         if (is_single_hop_neigh)
1500                 orig_neigh_node = orig_node;
1501         else
1502                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1503                                                          ethhdr->h_source);
1504
1505         if (!orig_neigh_node)
1506                 goto out;
1507
1508         /* Update nc_nodes of the originator */
1509         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1510                                  ogm_packet, is_single_hop_neigh);
1511
1512         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1513                                                    if_outgoing);
1514
1515         /* drop packet if sender is not a direct neighbor and if we
1516          * don't route towards it
1517          */
1518         if (!is_single_hop_neigh && !orig_neigh_router) {
1519                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1520                            "Drop packet: OGM via unknown neighbor!\n");
1521                 goto out_neigh;
1522         }
1523
1524         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1525                                             ogm_packet, if_incoming,
1526                                             if_outgoing);
1527
1528         /* update ranking if it is not a duplicate or has the same
1529          * seqno and similar ttl as the non-duplicate
1530          */
1531         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1532         if (!orig_ifinfo)
1533                 goto out_neigh;
1534
1535         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1536         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1537
1538         if (is_bidirect && (dup_status == BATADV_NO_DUP ||
1539                             (sameseq && similar_ttl))) {
1540                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1541                                           orig_ifinfo, ethhdr,
1542                                           ogm_packet, if_incoming,
1543                                           if_outgoing, dup_status);
1544         }
1545         batadv_orig_ifinfo_put(orig_ifinfo);
1546
1547         /* only forward for specific interface, not for the default one. */
1548         if (if_outgoing == BATADV_IF_DEFAULT)
1549                 goto out_neigh;
1550
1551         /* is single hop (direct) neighbor */
1552         if (is_single_hop_neigh) {
1553                 /* OGMs from secondary interfaces should only scheduled once
1554                  * per interface where it has been received, not multiple times
1555                  */
1556                 if (ogm_packet->ttl <= 2 &&
1557                     if_incoming != if_outgoing) {
1558                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1559                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1560                         goto out_neigh;
1561                 }
1562                 /* mark direct link on incoming interface */
1563                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1564                                       is_single_hop_neigh,
1565                                       is_from_best_next_hop, if_incoming,
1566                                       if_outgoing);
1567
1568                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1569                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1570                 goto out_neigh;
1571         }
1572
1573         /* multihop originator */
1574         if (!is_bidirect) {
1575                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1576                            "Drop packet: not received via bidirectional link\n");
1577                 goto out_neigh;
1578         }
1579
1580         if (dup_status == BATADV_NEIGH_DUP) {
1581                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1582                            "Drop packet: duplicate packet received\n");
1583                 goto out_neigh;
1584         }
1585
1586         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1587                    "Forwarding packet: rebroadcast originator packet\n");
1588         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1589                               is_single_hop_neigh, is_from_best_next_hop,
1590                               if_incoming, if_outgoing);
1591
1592 out_neigh:
1593         if (orig_neigh_node && !is_single_hop_neigh)
1594                 batadv_orig_node_put(orig_neigh_node);
1595 out:
1596         if (router_ifinfo)
1597                 batadv_neigh_ifinfo_put(router_ifinfo);
1598         if (router)
1599                 batadv_neigh_node_put(router);
1600         if (router_router)
1601                 batadv_neigh_node_put(router_router);
1602         if (orig_neigh_router)
1603                 batadv_neigh_node_put(orig_neigh_router);
1604         if (hardif_neigh)
1605                 batadv_hardif_neigh_put(hardif_neigh);
1606
1607         consume_skb(skb_priv);
1608 }
1609
1610 /**
1611  * batadv_iv_ogm_process - process an incoming batman iv OGM
1612  * @skb: the skb containing the OGM
1613  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1614  * @if_incoming: the interface where this packet was receved
1615  */
1616 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1617                                   struct batadv_hard_iface *if_incoming)
1618 {
1619         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1620         struct batadv_orig_node *orig_neigh_node, *orig_node;
1621         struct batadv_hard_iface *hard_iface;
1622         struct batadv_ogm_packet *ogm_packet;
1623         u32 if_incoming_seqno;
1624         bool has_directlink_flag;
1625         struct ethhdr *ethhdr;
1626         bool is_my_oldorig = false;
1627         bool is_my_addr = false;
1628         bool is_my_orig = false;
1629
1630         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1631         ethhdr = eth_hdr(skb);
1632
1633         /* Silently drop when the batman packet is actually not a
1634          * correct packet.
1635          *
1636          * This might happen if a packet is padded (e.g. Ethernet has a
1637          * minimum frame length of 64 byte) and the aggregation interprets
1638          * it as an additional length.
1639          *
1640          * TODO: A more sane solution would be to have a bit in the
1641          * batadv_ogm_packet to detect whether the packet is the last
1642          * packet in an aggregation.  Here we expect that the padding
1643          * is always zero (or not 0x01)
1644          */
1645         if (ogm_packet->packet_type != BATADV_IV_OGM)
1646                 return;
1647
1648         /* could be changed by schedule_own_packet() */
1649         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1650
1651         if (ogm_packet->flags & BATADV_DIRECTLINK)
1652                 has_directlink_flag = true;
1653         else
1654                 has_directlink_flag = false;
1655
1656         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1657                    "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",
1658                    ethhdr->h_source, if_incoming->net_dev->name,
1659                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1660                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1661                    ogm_packet->tq, ogm_packet->ttl,
1662                    ogm_packet->version, has_directlink_flag);
1663
1664         rcu_read_lock();
1665         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1666                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1667                         continue;
1668
1669                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1670                         continue;
1671
1672                 if (batadv_compare_eth(ethhdr->h_source,
1673                                        hard_iface->net_dev->dev_addr))
1674                         is_my_addr = true;
1675
1676                 if (batadv_compare_eth(ogm_packet->orig,
1677                                        hard_iface->net_dev->dev_addr))
1678                         is_my_orig = true;
1679
1680                 if (batadv_compare_eth(ogm_packet->prev_sender,
1681                                        hard_iface->net_dev->dev_addr))
1682                         is_my_oldorig = true;
1683         }
1684         rcu_read_unlock();
1685
1686         if (is_my_addr) {
1687                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1688                            "Drop packet: received my own broadcast (sender: %pM)\n",
1689                            ethhdr->h_source);
1690                 return;
1691         }
1692
1693         if (is_my_orig) {
1694                 unsigned long *word;
1695                 int offset;
1696                 s32 bit_pos;
1697                 s16 if_num;
1698                 u8 *weight;
1699
1700                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1701                                                          ethhdr->h_source);
1702                 if (!orig_neigh_node)
1703                         return;
1704
1705                 /* neighbor has to indicate direct link and it has to
1706                  * come via the corresponding interface
1707                  * save packet seqno for bidirectional check
1708                  */
1709                 if (has_directlink_flag &&
1710                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1711                                        ogm_packet->orig)) {
1712                         if_num = if_incoming->if_num;
1713                         offset = if_num * BATADV_NUM_WORDS;
1714
1715                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1716                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1717                         bit_pos = if_incoming_seqno - 2;
1718                         bit_pos -= ntohl(ogm_packet->seqno);
1719                         batadv_set_bit(word, bit_pos);
1720                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1721                         *weight = bitmap_weight(word,
1722                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1723                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1724                 }
1725
1726                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1727                            "Drop packet: originator packet from myself (via neighbor)\n");
1728                 batadv_orig_node_put(orig_neigh_node);
1729                 return;
1730         }
1731
1732         if (is_my_oldorig) {
1733                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1734                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1735                            ethhdr->h_source);
1736                 return;
1737         }
1738
1739         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1740                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1741                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1742                            ethhdr->h_source);
1743                 return;
1744         }
1745
1746         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1747         if (!orig_node)
1748                 return;
1749
1750         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1751                                         if_incoming, BATADV_IF_DEFAULT);
1752
1753         rcu_read_lock();
1754         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1755                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1756                         continue;
1757
1758                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1759                         continue;
1760
1761                 if (!kref_get_unless_zero(&hard_iface->refcount))
1762                         continue;
1763
1764                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1765                                                 if_incoming, hard_iface);
1766
1767                 batadv_hardif_put(hard_iface);
1768         }
1769         rcu_read_unlock();
1770
1771         batadv_orig_node_put(orig_node);
1772 }
1773
1774 static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work)
1775 {
1776         struct delayed_work *delayed_work;
1777         struct batadv_forw_packet *forw_packet;
1778         struct batadv_priv *bat_priv;
1779         bool dropped = false;
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
1786         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) {
1787                 dropped = true;
1788                 goto out;
1789         }
1790
1791         batadv_iv_ogm_emit(forw_packet);
1792
1793         /* we have to have at least one packet in the queue to determine the
1794          * queues wake up time unless we are shutting down.
1795          *
1796          * only re-schedule if this is the "original" copy, e.g. the OGM of the
1797          * primary interface should only be rescheduled once per period, but
1798          * this function will be called for the forw_packet instances of the
1799          * other secondary interfaces as well.
1800          */
1801         if (forw_packet->own &&
1802             forw_packet->if_incoming == forw_packet->if_outgoing)
1803                 batadv_iv_ogm_schedule(forw_packet->if_incoming);
1804
1805 out:
1806         /* do we get something for free()? */
1807         if (batadv_forw_packet_steal(forw_packet,
1808                                      &bat_priv->forw_bat_list_lock))
1809                 batadv_forw_packet_free(forw_packet, dropped);
1810 }
1811
1812 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1813                                  struct batadv_hard_iface *if_incoming)
1814 {
1815         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1816         struct batadv_ogm_packet *ogm_packet;
1817         u8 *packet_pos;
1818         int ogm_offset;
1819         bool res;
1820         int ret = NET_RX_DROP;
1821
1822         res = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1823         if (!res)
1824                 goto free_skb;
1825
1826         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1827          * that does not have B.A.T.M.A.N. IV enabled ?
1828          */
1829         if (bat_priv->algo_ops->iface.enable != batadv_iv_ogm_iface_enable)
1830                 goto free_skb;
1831
1832         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1833         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1834                            skb->len + ETH_HLEN);
1835
1836         ogm_offset = 0;
1837         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1838
1839         /* unpack the aggregated packets and process them one by one */
1840         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1841                                          ogm_packet->tvlv_len)) {
1842                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1843
1844                 ogm_offset += BATADV_OGM_HLEN;
1845                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1846
1847                 packet_pos = skb->data + ogm_offset;
1848                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1849         }
1850
1851         ret = NET_RX_SUCCESS;
1852
1853 free_skb:
1854         if (ret == NET_RX_SUCCESS)
1855                 consume_skb(skb);
1856         else
1857                 kfree_skb(skb);
1858
1859         return ret;
1860 }
1861
1862 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1863 /**
1864  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1865  * @orig_node: the orig_node for which the neighbors are printed
1866  * @if_outgoing: outgoing interface for these entries
1867  * @seq: debugfs table seq_file struct
1868  *
1869  * Must be called while holding an rcu lock.
1870  */
1871 static void
1872 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1873                                struct batadv_hard_iface *if_outgoing,
1874                                struct seq_file *seq)
1875 {
1876         struct batadv_neigh_node *neigh_node;
1877         struct batadv_neigh_ifinfo *n_ifinfo;
1878
1879         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1880                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1881                 if (!n_ifinfo)
1882                         continue;
1883
1884                 seq_printf(seq, " %pM (%3i)",
1885                            neigh_node->addr,
1886                            n_ifinfo->bat_iv.tq_avg);
1887
1888                 batadv_neigh_ifinfo_put(n_ifinfo);
1889         }
1890 }
1891
1892 /**
1893  * batadv_iv_ogm_orig_print - print the originator table
1894  * @bat_priv: the bat priv with all the soft interface information
1895  * @seq: debugfs table seq_file struct
1896  * @if_outgoing: the outgoing interface for which this should be printed
1897  */
1898 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1899                                      struct seq_file *seq,
1900                                      struct batadv_hard_iface *if_outgoing)
1901 {
1902         struct batadv_neigh_node *neigh_node;
1903         struct batadv_hashtable *hash = bat_priv->orig_hash;
1904         int last_seen_msecs, last_seen_secs;
1905         struct batadv_orig_node *orig_node;
1906         struct batadv_neigh_ifinfo *n_ifinfo;
1907         unsigned long last_seen_jiffies;
1908         struct hlist_head *head;
1909         int batman_count = 0;
1910         u32 i;
1911
1912         seq_puts(seq,
1913                  "  Originator      last-seen (#/255)           Nexthop [outgoingIF]:   Potential nexthops ...\n");
1914
1915         for (i = 0; i < hash->size; i++) {
1916                 head = &hash->table[i];
1917
1918                 rcu_read_lock();
1919                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1920                         neigh_node = batadv_orig_router_get(orig_node,
1921                                                             if_outgoing);
1922                         if (!neigh_node)
1923                                 continue;
1924
1925                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1926                                                            if_outgoing);
1927                         if (!n_ifinfo)
1928                                 goto next;
1929
1930                         if (n_ifinfo->bat_iv.tq_avg == 0)
1931                                 goto next;
1932
1933                         last_seen_jiffies = jiffies - orig_node->last_seen;
1934                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1935                         last_seen_secs = last_seen_msecs / 1000;
1936                         last_seen_msecs = last_seen_msecs % 1000;
1937
1938                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1939                                    orig_node->orig, last_seen_secs,
1940                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1941                                    neigh_node->addr,
1942                                    neigh_node->if_incoming->net_dev->name);
1943
1944                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1945                                                        seq);
1946                         seq_putc(seq, '\n');
1947                         batman_count++;
1948
1949 next:
1950                         batadv_neigh_node_put(neigh_node);
1951                         if (n_ifinfo)
1952                                 batadv_neigh_ifinfo_put(n_ifinfo);
1953                 }
1954                 rcu_read_unlock();
1955         }
1956
1957         if (batman_count == 0)
1958                 seq_puts(seq, "No batman nodes in range ...\n");
1959 }
1960 #endif
1961
1962 /**
1963  * batadv_iv_ogm_neigh_get_tq_avg - Get the TQ average for a neighbour on a
1964  *  given outgoing interface.
1965  * @neigh_node: Neighbour of interest
1966  * @if_outgoing: Outgoing interface of interest
1967  * @tq_avg: Pointer of where to store the TQ average
1968  *
1969  * Return: False if no average TQ available, otherwise true.
1970  */
1971 static bool
1972 batadv_iv_ogm_neigh_get_tq_avg(struct batadv_neigh_node *neigh_node,
1973                                struct batadv_hard_iface *if_outgoing,
1974                                u8 *tq_avg)
1975 {
1976         struct batadv_neigh_ifinfo *n_ifinfo;
1977
1978         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1979         if (!n_ifinfo)
1980                 return false;
1981
1982         *tq_avg = n_ifinfo->bat_iv.tq_avg;
1983         batadv_neigh_ifinfo_put(n_ifinfo);
1984
1985         return true;
1986 }
1987
1988 /**
1989  * batadv_iv_ogm_orig_dump_subentry - Dump an originator subentry into a
1990  *  message
1991  * @msg: Netlink message to dump into
1992  * @portid: Port making netlink request
1993  * @seq: Sequence number of netlink message
1994  * @bat_priv: The bat priv with all the soft interface information
1995  * @if_outgoing: Limit dump to entries with this outgoing interface
1996  * @orig_node: Originator to dump
1997  * @neigh_node: Single hops neighbour
1998  * @best: Is the best originator
1999  *
2000  * Return: Error code, or 0 on success
2001  */
2002 static int
2003 batadv_iv_ogm_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
2004                                  struct batadv_priv *bat_priv,
2005                                  struct batadv_hard_iface *if_outgoing,
2006                                  struct batadv_orig_node *orig_node,
2007                                  struct batadv_neigh_node *neigh_node,
2008                                  bool best)
2009 {
2010         void *hdr;
2011         u8 tq_avg;
2012         unsigned int last_seen_msecs;
2013
2014         last_seen_msecs = jiffies_to_msecs(jiffies - orig_node->last_seen);
2015
2016         if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node, if_outgoing, &tq_avg))
2017                 return 0;
2018
2019         if (if_outgoing != BATADV_IF_DEFAULT &&
2020             if_outgoing != neigh_node->if_incoming)
2021                 return 0;
2022
2023         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2024                           NLM_F_MULTI, BATADV_CMD_GET_ORIGINATORS);
2025         if (!hdr)
2026                 return -ENOBUFS;
2027
2028         if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2029                     orig_node->orig) ||
2030             nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
2031                     neigh_node->addr) ||
2032             nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
2033                         neigh_node->if_incoming->net_dev->ifindex) ||
2034             nla_put_u8(msg, BATADV_ATTR_TQ, tq_avg) ||
2035             nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
2036                         last_seen_msecs))
2037                 goto nla_put_failure;
2038
2039         if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
2040                 goto nla_put_failure;
2041
2042         genlmsg_end(msg, hdr);
2043         return 0;
2044
2045  nla_put_failure:
2046         genlmsg_cancel(msg, hdr);
2047         return -EMSGSIZE;
2048 }
2049
2050 /**
2051  * batadv_iv_ogm_orig_dump_entry - Dump an originator entry into a message
2052  * @msg: Netlink message to dump into
2053  * @portid: Port making netlink request
2054  * @seq: Sequence number of netlink message
2055  * @bat_priv: The bat priv with all the soft interface information
2056  * @if_outgoing: Limit dump to entries with this outgoing interface
2057  * @orig_node: Originator to dump
2058  * @sub_s: Number of sub entries to skip
2059  *
2060  * This function assumes the caller holds rcu_read_lock().
2061  *
2062  * Return: Error code, or 0 on success
2063  */
2064 static int
2065 batadv_iv_ogm_orig_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2066                               struct batadv_priv *bat_priv,
2067                               struct batadv_hard_iface *if_outgoing,
2068                               struct batadv_orig_node *orig_node, int *sub_s)
2069 {
2070         struct batadv_neigh_node *neigh_node_best;
2071         struct batadv_neigh_node *neigh_node;
2072         int sub = 0;
2073         bool best;
2074         u8 tq_avg_best;
2075
2076         neigh_node_best = batadv_orig_router_get(orig_node, if_outgoing);
2077         if (!neigh_node_best)
2078                 goto out;
2079
2080         if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node_best, if_outgoing,
2081                                             &tq_avg_best))
2082                 goto out;
2083
2084         if (tq_avg_best == 0)
2085                 goto out;
2086
2087         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
2088                 if (sub++ < *sub_s)
2089                         continue;
2090
2091                 best = (neigh_node == neigh_node_best);
2092
2093                 if (batadv_iv_ogm_orig_dump_subentry(msg, portid, seq,
2094                                                      bat_priv, if_outgoing,
2095                                                      orig_node, neigh_node,
2096                                                      best)) {
2097                         batadv_neigh_node_put(neigh_node_best);
2098
2099                         *sub_s = sub - 1;
2100                         return -EMSGSIZE;
2101                 }
2102         }
2103
2104  out:
2105         if (neigh_node_best)
2106                 batadv_neigh_node_put(neigh_node_best);
2107
2108         *sub_s = 0;
2109         return 0;
2110 }
2111
2112 /**
2113  * batadv_iv_ogm_orig_dump_bucket - Dump an originator bucket into a
2114  *  message
2115  * @msg: Netlink message to dump into
2116  * @portid: Port making netlink request
2117  * @seq: Sequence number of netlink message
2118  * @bat_priv: The bat priv with all the soft interface information
2119  * @if_outgoing: Limit dump to entries with this outgoing interface
2120  * @head: Bucket to be dumped
2121  * @idx_s: Number of entries to be skipped
2122  * @sub: Number of sub entries to be skipped
2123  *
2124  * Return: Error code, or 0 on success
2125  */
2126 static int
2127 batadv_iv_ogm_orig_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2128                                struct batadv_priv *bat_priv,
2129                                struct batadv_hard_iface *if_outgoing,
2130                                struct hlist_head *head, int *idx_s, int *sub)
2131 {
2132         struct batadv_orig_node *orig_node;
2133         int idx = 0;
2134
2135         rcu_read_lock();
2136         hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
2137                 if (idx++ < *idx_s)
2138                         continue;
2139
2140                 if (batadv_iv_ogm_orig_dump_entry(msg, portid, seq, bat_priv,
2141                                                   if_outgoing, orig_node,
2142                                                   sub)) {
2143                         rcu_read_unlock();
2144                         *idx_s = idx - 1;
2145                         return -EMSGSIZE;
2146                 }
2147         }
2148         rcu_read_unlock();
2149
2150         *idx_s = 0;
2151         *sub = 0;
2152         return 0;
2153 }
2154
2155 /**
2156  * batadv_iv_ogm_orig_dump - Dump the originators into a message
2157  * @msg: Netlink message to dump into
2158  * @cb: Control block containing additional options
2159  * @bat_priv: The bat priv with all the soft interface information
2160  * @if_outgoing: Limit dump to entries with this outgoing interface
2161  */
2162 static void
2163 batadv_iv_ogm_orig_dump(struct sk_buff *msg, struct netlink_callback *cb,
2164                         struct batadv_priv *bat_priv,
2165                         struct batadv_hard_iface *if_outgoing)
2166 {
2167         struct batadv_hashtable *hash = bat_priv->orig_hash;
2168         struct hlist_head *head;
2169         int bucket = cb->args[0];
2170         int idx = cb->args[1];
2171         int sub = cb->args[2];
2172         int portid = NETLINK_CB(cb->skb).portid;
2173
2174         while (bucket < hash->size) {
2175                 head = &hash->table[bucket];
2176
2177                 if (batadv_iv_ogm_orig_dump_bucket(msg, portid,
2178                                                    cb->nlh->nlmsg_seq,
2179                                                    bat_priv, if_outgoing, head,
2180                                                    &idx, &sub))
2181                         break;
2182
2183                 bucket++;
2184         }
2185
2186         cb->args[0] = bucket;
2187         cb->args[1] = idx;
2188         cb->args[2] = sub;
2189 }
2190
2191 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2192 /**
2193  * batadv_iv_hardif_neigh_print - print a single hop neighbour node
2194  * @seq: neighbour table seq_file struct
2195  * @hardif_neigh: hardif neighbour information
2196  */
2197 static void
2198 batadv_iv_hardif_neigh_print(struct seq_file *seq,
2199                              struct batadv_hardif_neigh_node *hardif_neigh)
2200 {
2201         int last_secs, last_msecs;
2202
2203         last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
2204         last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
2205
2206         seq_printf(seq, "   %10s   %pM %4i.%03is\n",
2207                    hardif_neigh->if_incoming->net_dev->name,
2208                    hardif_neigh->addr, last_secs, last_msecs);
2209 }
2210
2211 /**
2212  * batadv_iv_ogm_neigh_print - print the single hop neighbour list
2213  * @bat_priv: the bat priv with all the soft interface information
2214  * @seq: neighbour table seq_file struct
2215  */
2216 static void batadv_iv_neigh_print(struct batadv_priv *bat_priv,
2217                                   struct seq_file *seq)
2218 {
2219         struct net_device *net_dev = (struct net_device *)seq->private;
2220         struct batadv_hardif_neigh_node *hardif_neigh;
2221         struct batadv_hard_iface *hard_iface;
2222         int batman_count = 0;
2223
2224         seq_puts(seq, "           IF        Neighbor      last-seen\n");
2225
2226         rcu_read_lock();
2227         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
2228                 if (hard_iface->soft_iface != net_dev)
2229                         continue;
2230
2231                 hlist_for_each_entry_rcu(hardif_neigh,
2232                                          &hard_iface->neigh_list, list) {
2233                         batadv_iv_hardif_neigh_print(seq, hardif_neigh);
2234                         batman_count++;
2235                 }
2236         }
2237         rcu_read_unlock();
2238
2239         if (batman_count == 0)
2240                 seq_puts(seq, "No batman nodes in range ...\n");
2241 }
2242 #endif
2243
2244 /**
2245  * batadv_iv_ogm_neigh_diff - calculate tq difference of two neighbors
2246  * @neigh1: the first neighbor object of the comparison
2247  * @if_outgoing1: outgoing interface for the first neighbor
2248  * @neigh2: the second neighbor object of the comparison
2249  * @if_outgoing2: outgoing interface for the second neighbor
2250  * @diff: pointer to integer receiving the calculated difference
2251  *
2252  * The content of *@diff is only valid when this function returns true.
2253  * It is less, equal to or greater than 0 if the metric via neigh1 is lower,
2254  * the same as or higher than the metric via neigh2
2255  *
2256  * Return: true when the difference could be calculated, false otherwise
2257  */
2258 static bool batadv_iv_ogm_neigh_diff(struct batadv_neigh_node *neigh1,
2259                                      struct batadv_hard_iface *if_outgoing1,
2260                                      struct batadv_neigh_node *neigh2,
2261                                      struct batadv_hard_iface *if_outgoing2,
2262                                      int *diff)
2263 {
2264         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
2265         u8 tq1, tq2;
2266         bool ret = true;
2267
2268         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
2269         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
2270
2271         if (!neigh1_ifinfo || !neigh2_ifinfo) {
2272                 ret = false;
2273                 goto out;
2274         }
2275
2276         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2277         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2278         *diff = (int)tq1 - (int)tq2;
2279
2280 out:
2281         if (neigh1_ifinfo)
2282                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
2283         if (neigh2_ifinfo)
2284                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
2285
2286         return ret;
2287 }
2288
2289 /**
2290  * batadv_iv_ogm_neigh_dump_neigh - Dump a neighbour into a netlink message
2291  * @msg: Netlink message to dump into
2292  * @portid: Port making netlink request
2293  * @seq: Sequence number of netlink message
2294  * @hardif_neigh: Neighbour to be dumped
2295  *
2296  * Return: Error code, or 0 on success
2297  */
2298 static int
2299 batadv_iv_ogm_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq,
2300                                struct batadv_hardif_neigh_node *hardif_neigh)
2301 {
2302         void *hdr;
2303         unsigned int last_seen_msecs;
2304
2305         last_seen_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen);
2306
2307         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2308                           NLM_F_MULTI, BATADV_CMD_GET_NEIGHBORS);
2309         if (!hdr)
2310                 return -ENOBUFS;
2311
2312         if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
2313                     hardif_neigh->addr) ||
2314             nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
2315                         hardif_neigh->if_incoming->net_dev->ifindex) ||
2316             nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
2317                         last_seen_msecs))
2318                 goto nla_put_failure;
2319
2320         genlmsg_end(msg, hdr);
2321         return 0;
2322
2323  nla_put_failure:
2324         genlmsg_cancel(msg, hdr);
2325         return -EMSGSIZE;
2326 }
2327
2328 /**
2329  * batadv_iv_ogm_neigh_dump_hardif - Dump the neighbours of a hard interface
2330  *  into a message
2331  * @msg: Netlink message to dump into
2332  * @portid: Port making netlink request
2333  * @seq: Sequence number of netlink message
2334  * @bat_priv: The bat priv with all the soft interface information
2335  * @hard_iface: Hard interface to dump the neighbours for
2336  * @idx_s: Number of entries to skip
2337  *
2338  * This function assumes the caller holds rcu_read_lock().
2339  *
2340  * Return: Error code, or 0 on success
2341  */
2342 static int
2343 batadv_iv_ogm_neigh_dump_hardif(struct sk_buff *msg, u32 portid, u32 seq,
2344                                 struct batadv_priv *bat_priv,
2345                                 struct batadv_hard_iface *hard_iface,
2346                                 int *idx_s)
2347 {
2348         struct batadv_hardif_neigh_node *hardif_neigh;
2349         int idx = 0;
2350
2351         hlist_for_each_entry_rcu(hardif_neigh,
2352                                  &hard_iface->neigh_list, list) {
2353                 if (idx++ < *idx_s)
2354                         continue;
2355
2356                 if (batadv_iv_ogm_neigh_dump_neigh(msg, portid, seq,
2357                                                    hardif_neigh)) {
2358                         *idx_s = idx - 1;
2359                         return -EMSGSIZE;
2360                 }
2361         }
2362
2363         *idx_s = 0;
2364         return 0;
2365 }
2366
2367 /**
2368  * batadv_iv_ogm_neigh_dump - Dump the neighbours into a message
2369  * @msg: Netlink message to dump into
2370  * @cb: Control block containing additional options
2371  * @bat_priv: The bat priv with all the soft interface information
2372  * @single_hardif: Limit dump to this hard interfaace
2373  */
2374 static void
2375 batadv_iv_ogm_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb,
2376                          struct batadv_priv *bat_priv,
2377                          struct batadv_hard_iface *single_hardif)
2378 {
2379         struct batadv_hard_iface *hard_iface;
2380         int i_hardif = 0;
2381         int i_hardif_s = cb->args[0];
2382         int idx = cb->args[1];
2383         int portid = NETLINK_CB(cb->skb).portid;
2384
2385         rcu_read_lock();
2386         if (single_hardif) {
2387                 if (i_hardif_s == 0) {
2388                         if (batadv_iv_ogm_neigh_dump_hardif(msg, portid,
2389                                                             cb->nlh->nlmsg_seq,
2390                                                             bat_priv,
2391                                                             single_hardif,
2392                                                             &idx) == 0)
2393                                 i_hardif++;
2394                 }
2395         } else {
2396                 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list,
2397                                         list) {
2398                         if (hard_iface->soft_iface != bat_priv->soft_iface)
2399                                 continue;
2400
2401                         if (i_hardif++ < i_hardif_s)
2402                                 continue;
2403
2404                         if (batadv_iv_ogm_neigh_dump_hardif(msg, portid,
2405                                                             cb->nlh->nlmsg_seq,
2406                                                             bat_priv,
2407                                                             hard_iface, &idx)) {
2408                                 i_hardif--;
2409                                 break;
2410                         }
2411                 }
2412         }
2413         rcu_read_unlock();
2414
2415         cb->args[0] = i_hardif;
2416         cb->args[1] = idx;
2417 }
2418
2419 /**
2420  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
2421  * @neigh1: the first neighbor object of the comparison
2422  * @if_outgoing1: outgoing interface for the first neighbor
2423  * @neigh2: the second neighbor object of the comparison
2424  * @if_outgoing2: outgoing interface for the second neighbor
2425  *
2426  * Return: a value less, equal to or greater than 0 if the metric via neigh1 is
2427  * lower, the same as or higher than the metric via neigh2
2428  */
2429 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
2430                                    struct batadv_hard_iface *if_outgoing1,
2431                                    struct batadv_neigh_node *neigh2,
2432                                    struct batadv_hard_iface *if_outgoing2)
2433 {
2434         bool ret;
2435         int diff;
2436
2437         ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2,
2438                                        if_outgoing2, &diff);
2439         if (!ret)
2440                 return 0;
2441
2442         return diff;
2443 }
2444
2445 /**
2446  * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better
2447  *  than neigh2 from the metric prospective
2448  * @neigh1: the first neighbor object of the comparison
2449  * @if_outgoing1: outgoing interface for the first neighbor
2450  * @neigh2: the second neighbor object of the comparison
2451  * @if_outgoing2: outgoing interface for the second neighbor
2452  *
2453  * Return: true if the metric via neigh1 is equally good or better than
2454  * the metric via neigh2, false otherwise.
2455  */
2456 static bool
2457 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1,
2458                            struct batadv_hard_iface *if_outgoing1,
2459                            struct batadv_neigh_node *neigh2,
2460                            struct batadv_hard_iface *if_outgoing2)
2461 {
2462         bool ret;
2463         int diff;
2464
2465         ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2,
2466                                        if_outgoing2, &diff);
2467         if (!ret)
2468                 return false;
2469
2470         ret = diff > -BATADV_TQ_SIMILARITY_THRESHOLD;
2471         return ret;
2472 }
2473
2474 static void batadv_iv_iface_activate(struct batadv_hard_iface *hard_iface)
2475 {
2476         /* begin scheduling originator messages on that interface */
2477         batadv_iv_ogm_schedule(hard_iface);
2478 }
2479
2480 /**
2481  * batadv_iv_init_sel_class - initialize GW selection class
2482  * @bat_priv: the bat priv with all the soft interface information
2483  */
2484 static void batadv_iv_init_sel_class(struct batadv_priv *bat_priv)
2485 {
2486         /* set default TQ difference threshold to 20 */
2487         atomic_set(&bat_priv->gw.sel_class, 20);
2488 }
2489
2490 static struct batadv_gw_node *
2491 batadv_iv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
2492 {
2493         struct batadv_neigh_node *router;
2494         struct batadv_neigh_ifinfo *router_ifinfo;
2495         struct batadv_gw_node *gw_node, *curr_gw = NULL;
2496         u64 max_gw_factor = 0;
2497         u64 tmp_gw_factor = 0;
2498         u8 max_tq = 0;
2499         u8 tq_avg;
2500         struct batadv_orig_node *orig_node;
2501
2502         rcu_read_lock();
2503         hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) {
2504                 orig_node = gw_node->orig_node;
2505                 router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
2506                 if (!router)
2507                         continue;
2508
2509                 router_ifinfo = batadv_neigh_ifinfo_get(router,
2510                                                         BATADV_IF_DEFAULT);
2511                 if (!router_ifinfo)
2512                         goto next;
2513
2514                 if (!kref_get_unless_zero(&gw_node->refcount))
2515                         goto next;
2516
2517                 tq_avg = router_ifinfo->bat_iv.tq_avg;
2518
2519                 switch (atomic_read(&bat_priv->gw.sel_class)) {
2520                 case 1: /* fast connection */
2521                         tmp_gw_factor = tq_avg * tq_avg;
2522                         tmp_gw_factor *= gw_node->bandwidth_down;
2523                         tmp_gw_factor *= 100 * 100;
2524                         tmp_gw_factor >>= 18;
2525
2526                         if (tmp_gw_factor > max_gw_factor ||
2527                             (tmp_gw_factor == max_gw_factor &&
2528                              tq_avg > max_tq)) {
2529                                 if (curr_gw)
2530                                         batadv_gw_node_put(curr_gw);
2531                                 curr_gw = gw_node;
2532                                 kref_get(&curr_gw->refcount);
2533                         }
2534                         break;
2535
2536                 default: /* 2:  stable connection (use best statistic)
2537                           * 3:  fast-switch (use best statistic but change as
2538                           *     soon as a better gateway appears)
2539                           * XX: late-switch (use best statistic but change as
2540                           *     soon as a better gateway appears which has
2541                           *     $routing_class more tq points)
2542                           */
2543                         if (tq_avg > max_tq) {
2544                                 if (curr_gw)
2545                                         batadv_gw_node_put(curr_gw);
2546                                 curr_gw = gw_node;
2547                                 kref_get(&curr_gw->refcount);
2548                         }
2549                         break;
2550                 }
2551
2552                 if (tq_avg > max_tq)
2553                         max_tq = tq_avg;
2554
2555                 if (tmp_gw_factor > max_gw_factor)
2556                         max_gw_factor = tmp_gw_factor;
2557
2558                 batadv_gw_node_put(gw_node);
2559
2560 next:
2561                 batadv_neigh_node_put(router);
2562                 if (router_ifinfo)
2563                         batadv_neigh_ifinfo_put(router_ifinfo);
2564         }
2565         rcu_read_unlock();
2566
2567         return curr_gw;
2568 }
2569
2570 static bool batadv_iv_gw_is_eligible(struct batadv_priv *bat_priv,
2571                                      struct batadv_orig_node *curr_gw_orig,
2572                                      struct batadv_orig_node *orig_node)
2573 {
2574         struct batadv_neigh_ifinfo *router_orig_ifinfo = NULL;
2575         struct batadv_neigh_ifinfo *router_gw_ifinfo = NULL;
2576         struct batadv_neigh_node *router_gw = NULL;
2577         struct batadv_neigh_node *router_orig = NULL;
2578         u8 gw_tq_avg, orig_tq_avg;
2579         bool ret = false;
2580
2581         /* dynamic re-election is performed only on fast or late switch */
2582         if (atomic_read(&bat_priv->gw.sel_class) <= 2)
2583                 return false;
2584
2585         router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT);
2586         if (!router_gw) {
2587                 ret = true;
2588                 goto out;
2589         }
2590
2591         router_gw_ifinfo = batadv_neigh_ifinfo_get(router_gw,
2592                                                    BATADV_IF_DEFAULT);
2593         if (!router_gw_ifinfo) {
2594                 ret = true;
2595                 goto out;
2596         }
2597
2598         router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
2599         if (!router_orig)
2600                 goto out;
2601
2602         router_orig_ifinfo = batadv_neigh_ifinfo_get(router_orig,
2603                                                      BATADV_IF_DEFAULT);
2604         if (!router_orig_ifinfo)
2605                 goto out;
2606
2607         gw_tq_avg = router_gw_ifinfo->bat_iv.tq_avg;
2608         orig_tq_avg = router_orig_ifinfo->bat_iv.tq_avg;
2609
2610         /* the TQ value has to be better */
2611         if (orig_tq_avg < gw_tq_avg)
2612                 goto out;
2613
2614         /* if the routing class is greater than 3 the value tells us how much
2615          * greater the TQ value of the new gateway must be
2616          */
2617         if ((atomic_read(&bat_priv->gw.sel_class) > 3) &&
2618             (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw.sel_class)))
2619                 goto out;
2620
2621         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
2622                    "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n",
2623                    gw_tq_avg, orig_tq_avg);
2624
2625         ret = true;
2626 out:
2627         if (router_gw_ifinfo)
2628                 batadv_neigh_ifinfo_put(router_gw_ifinfo);
2629         if (router_orig_ifinfo)
2630                 batadv_neigh_ifinfo_put(router_orig_ifinfo);
2631         if (router_gw)
2632                 batadv_neigh_node_put(router_gw);
2633         if (router_orig)
2634                 batadv_neigh_node_put(router_orig);
2635
2636         return ret;
2637 }
2638
2639 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2640 /* fails if orig_node has no router */
2641 static int batadv_iv_gw_write_buffer_text(struct batadv_priv *bat_priv,
2642                                           struct seq_file *seq,
2643                                           const struct batadv_gw_node *gw_node)
2644 {
2645         struct batadv_gw_node *curr_gw;
2646         struct batadv_neigh_node *router;
2647         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
2648         int ret = -1;
2649
2650         router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
2651         if (!router)
2652                 goto out;
2653
2654         router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
2655         if (!router_ifinfo)
2656                 goto out;
2657
2658         curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
2659
2660         seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n",
2661                    (curr_gw == gw_node ? "=>" : "  "),
2662                    gw_node->orig_node->orig,
2663                    router_ifinfo->bat_iv.tq_avg, router->addr,
2664                    router->if_incoming->net_dev->name,
2665                    gw_node->bandwidth_down / 10,
2666                    gw_node->bandwidth_down % 10,
2667                    gw_node->bandwidth_up / 10,
2668                    gw_node->bandwidth_up % 10);
2669         ret = seq_has_overflowed(seq) ? -1 : 0;
2670
2671         if (curr_gw)
2672                 batadv_gw_node_put(curr_gw);
2673 out:
2674         if (router_ifinfo)
2675                 batadv_neigh_ifinfo_put(router_ifinfo);
2676         if (router)
2677                 batadv_neigh_node_put(router);
2678         return ret;
2679 }
2680
2681 static void batadv_iv_gw_print(struct batadv_priv *bat_priv,
2682                                struct seq_file *seq)
2683 {
2684         struct batadv_gw_node *gw_node;
2685         int gw_count = 0;
2686
2687         seq_puts(seq,
2688                  "      Gateway      (#/255)           Nexthop [outgoingIF]: advertised uplink bandwidth\n");
2689
2690         rcu_read_lock();
2691         hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) {
2692                 /* fails if orig_node has no router */
2693                 if (batadv_iv_gw_write_buffer_text(bat_priv, seq, gw_node) < 0)
2694                         continue;
2695
2696                 gw_count++;
2697         }
2698         rcu_read_unlock();
2699
2700         if (gw_count == 0)
2701                 seq_puts(seq, "No gateways in range ...\n");
2702 }
2703 #endif
2704
2705 /**
2706  * batadv_iv_gw_dump_entry - Dump a gateway into a message
2707  * @msg: Netlink message to dump into
2708  * @portid: Port making netlink request
2709  * @seq: Sequence number of netlink message
2710  * @bat_priv: The bat priv with all the soft interface information
2711  * @gw_node: Gateway to be dumped
2712  *
2713  * Return: Error code, or 0 on success
2714  */
2715 static int batadv_iv_gw_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2716                                    struct batadv_priv *bat_priv,
2717                                    struct batadv_gw_node *gw_node)
2718 {
2719         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
2720         struct batadv_neigh_node *router;
2721         struct batadv_gw_node *curr_gw;
2722         int ret = -EINVAL;
2723         void *hdr;
2724
2725         router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
2726         if (!router)
2727                 goto out;
2728
2729         router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
2730         if (!router_ifinfo)
2731                 goto out;
2732
2733         curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
2734
2735         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2736                           NLM_F_MULTI, BATADV_CMD_GET_GATEWAYS);
2737         if (!hdr) {
2738                 ret = -ENOBUFS;
2739                 goto out;
2740         }
2741
2742         ret = -EMSGSIZE;
2743
2744         if (curr_gw == gw_node)
2745                 if (nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) {
2746                         genlmsg_cancel(msg, hdr);
2747                         goto out;
2748                 }
2749
2750         if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2751                     gw_node->orig_node->orig) ||
2752             nla_put_u8(msg, BATADV_ATTR_TQ, router_ifinfo->bat_iv.tq_avg) ||
2753             nla_put(msg, BATADV_ATTR_ROUTER, ETH_ALEN,
2754                     router->addr) ||
2755             nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
2756                            router->if_incoming->net_dev->name) ||
2757             nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN,
2758                         gw_node->bandwidth_down) ||
2759             nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP,
2760                         gw_node->bandwidth_up)) {
2761                 genlmsg_cancel(msg, hdr);
2762                 goto out;
2763         }
2764
2765         genlmsg_end(msg, hdr);
2766         ret = 0;
2767
2768 out:
2769         if (router_ifinfo)
2770                 batadv_neigh_ifinfo_put(router_ifinfo);
2771         if (router)
2772                 batadv_neigh_node_put(router);
2773         return ret;
2774 }
2775
2776 /**
2777  * batadv_iv_gw_dump - Dump gateways into a message
2778  * @msg: Netlink message to dump into
2779  * @cb: Control block containing additional options
2780  * @bat_priv: The bat priv with all the soft interface information
2781  */
2782 static void batadv_iv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb,
2783                               struct batadv_priv *bat_priv)
2784 {
2785         int portid = NETLINK_CB(cb->skb).portid;
2786         struct batadv_gw_node *gw_node;
2787         int idx_skip = cb->args[0];
2788         int idx = 0;
2789
2790         rcu_read_lock();
2791         hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) {
2792                 if (idx++ < idx_skip)
2793                         continue;
2794
2795                 if (batadv_iv_gw_dump_entry(msg, portid, cb->nlh->nlmsg_seq,
2796                                             bat_priv, gw_node)) {
2797                         idx_skip = idx - 1;
2798                         goto unlock;
2799                 }
2800         }
2801
2802         idx_skip = idx;
2803 unlock:
2804         rcu_read_unlock();
2805
2806         cb->args[0] = idx_skip;
2807 }
2808
2809 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
2810         .name = "BATMAN_IV",
2811         .iface = {
2812                 .activate = batadv_iv_iface_activate,
2813                 .enable = batadv_iv_ogm_iface_enable,
2814                 .disable = batadv_iv_ogm_iface_disable,
2815                 .update_mac = batadv_iv_ogm_iface_update_mac,
2816                 .primary_set = batadv_iv_ogm_primary_iface_set,
2817         },
2818         .neigh = {
2819                 .cmp = batadv_iv_ogm_neigh_cmp,
2820                 .is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
2821 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2822                 .print = batadv_iv_neigh_print,
2823 #endif
2824                 .dump = batadv_iv_ogm_neigh_dump,
2825         },
2826         .orig = {
2827 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2828                 .print = batadv_iv_ogm_orig_print,
2829 #endif
2830                 .dump = batadv_iv_ogm_orig_dump,
2831                 .free = batadv_iv_ogm_orig_free,
2832                 .add_if = batadv_iv_ogm_orig_add_if,
2833                 .del_if = batadv_iv_ogm_orig_del_if,
2834         },
2835         .gw = {
2836                 .init_sel_class = batadv_iv_init_sel_class,
2837                 .get_best_gw_node = batadv_iv_gw_get_best_gw_node,
2838                 .is_eligible = batadv_iv_gw_is_eligible,
2839 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2840                 .print = batadv_iv_gw_print,
2841 #endif
2842                 .dump = batadv_iv_gw_dump,
2843         },
2844 };
2845
2846 int __init batadv_iv_init(void)
2847 {
2848         int ret;
2849
2850         /* batman originator packet */
2851         ret = batadv_recv_handler_register(BATADV_IV_OGM,
2852                                            batadv_iv_ogm_receive);
2853         if (ret < 0)
2854                 goto out;
2855
2856         ret = batadv_algo_register(&batadv_batman_iv);
2857         if (ret < 0)
2858                 goto handler_unregister;
2859
2860         goto out;
2861
2862 handler_unregister:
2863         batadv_recv_handler_unregister(BATADV_IV_OGM);
2864 out:
2865         return ret;
2866 }