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 char *skb_buff;
 733         unsigned long new_direct_link_flag;
 734
 735         skb_buff = skb_put_data(forw_packet_aggr->skb, packet_buff,
 736                                 packet_len);
 737         forw_packet_aggr->packet_len += packet_len;
 738         forw_packet_aggr->num_packets++;
 739
 740         /* save packet direct link flag status */
 741         if (direct_link) {
 742                 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 743                 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 744         }
 745 }
 746
 747 /**
 748  * batadv_iv_ogm_queue_add - queue up an OGM for transmission
 749  * @bat_priv: the bat priv with all the soft interface information
 750  * @packet_buff: pointer to the OGM
 751  * @packet_len: (total) length of the OGM
 752  * @if_incoming: interface where the packet was received
 753  * @if_outgoing: interface for which the retransmission should be considered
 754  * @own_packet: true if it is a self-generated ogm
 755  * @send_time: timestamp (jiffies) when the packet is to be sent
 756  */
 757 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 758                                     unsigned char *packet_buff,
 759                                     int packet_len,
 760                                     struct batadv_hard_iface *if_incoming,
 761                                     struct batadv_hard_iface *if_outgoing,
 762                                     int own_packet, unsigned long send_time)
 763 {
 764         /* _aggr -> pointer to the packet we want to aggregate with
 765          * _pos -> pointer to the position in the queue
 766          */
 767         struct batadv_forw_packet *forw_packet_aggr = NULL;
 768         struct batadv_forw_packet *forw_packet_pos = NULL;
 769         struct batadv_ogm_packet *batadv_ogm_packet;
 770         bool direct_link;
 771         unsigned long max_aggregation_jiffies;
 772
 773         batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 774         direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK);
 775         max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 776
 777         /* find position for the packet in the forward queue */
 778         spin_lock_bh(&bat_priv->forw_bat_list_lock);
 779         /* own packets are not to be aggregated */
 780         if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) {
 781                 hlist_for_each_entry(forw_packet_pos,
 782                                      &bat_priv->forw_bat_list, list) {
 783                         if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 784                                                         bat_priv, packet_len,
 785                                                         send_time, direct_link,
 786                                                         if_incoming,
 787                                                         if_outgoing,
 788                                                         forw_packet_pos)) {
 789                                 forw_packet_aggr = forw_packet_pos;
 790                                 break;
 791                         }
 792                 }
 793         }
 794
 795         /* nothing to aggregate with - either aggregation disabled or no
 796          * suitable aggregation packet found
 797          */
 798         if (!forw_packet_aggr) {
 799                 /* the following section can run without the lock */
 800                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 801
 802                 /* if we could not aggregate this packet with one of the others
 803                  * we hold it back for a while, so that it might be aggregated
 804                  * later on
 805                  */
 806                 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 807                         send_time += max_aggregation_jiffies;
 808
 809                 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 810                                             send_time, direct_link,
 811                                             if_incoming, if_outgoing,
 812                                             own_packet);
 813         } else {
 814                 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 815                                         packet_len, direct_link);
 816                 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 817         }
 818 }
 819
 820 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 821                                   const struct ethhdr *ethhdr,
 822                                   struct batadv_ogm_packet *batadv_ogm_packet,
 823                                   bool is_single_hop_neigh,
 824                                   bool is_from_best_next_hop,
 825                                   struct batadv_hard_iface *if_incoming,
 826                                   struct batadv_hard_iface *if_outgoing)
 827 {
 828         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 829         u16 tvlv_len;
 830
 831         if (batadv_ogm_packet->ttl <= 1) {
 832                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 833                 return;
 834         }
 835
 836         if (!is_from_best_next_hop) {
 837                 /* Mark the forwarded packet when it is not coming from our
 838                  * best next hop. We still need to forward the packet for our
 839                  * neighbor link quality detection to work in case the packet
 840                  * originated from a single hop neighbor. Otherwise we can
 841                  * simply drop the ogm.
 842                  */
 843                 if (is_single_hop_neigh)
 844                         batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 845                 else
 846                         return;
 847         }
 848
 849         tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 850
 851         batadv_ogm_packet->ttl--;
 852         ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 853
 854         /* apply hop penalty */
 855         batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 856                                                    bat_priv);
 857
 858         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 859                    "Forwarding packet: tq: %i, ttl: %i\n",
 860                    batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
 861
 862         if (is_single_hop_neigh)
 863                 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 864         else
 865                 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 866
 867         batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 868                                 BATADV_OGM_HLEN + tvlv_len,
 869                                 if_incoming, if_outgoing, 0,
 870                                 batadv_iv_ogm_fwd_send_time());
 871 }
 872
 873 /**
 874  * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
 875  * the given interface
 876  * @hard_iface: the interface for which the windows have to be shifted
 877  */
 878 static void
 879 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
 880 {
 881         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 882         struct batadv_hashtable *hash = bat_priv->orig_hash;
 883         struct hlist_head *head;
 884         struct batadv_orig_node *orig_node;
 885         unsigned long *word;
 886         u32 i;
 887         size_t word_index;
 888         u8 *w;
 889         int if_num;
 890
 891         for (i = 0; i < hash->size; i++) {
 892                 head = &hash->table[i];
 893
 894                 rcu_read_lock();
 895                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 896                         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 897                         word_index = hard_iface->if_num * BATADV_NUM_WORDS;
 898                         word = &orig_node->bat_iv.bcast_own[word_index];
 899
 900                         batadv_bit_get_packet(bat_priv, word, 1, 0);
 901                         if_num = hard_iface->if_num;
 902                         w = &orig_node->bat_iv.bcast_own_sum[if_num];
 903                         *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
 904                         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
 905                 }
 906                 rcu_read_unlock();
 907         }
 908 }
 909
 910 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 911 {
 912         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 913         unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
 914         struct batadv_ogm_packet *batadv_ogm_packet;
 915         struct batadv_hard_iface *primary_if, *tmp_hard_iface;
 916         int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
 917         u32 seqno;
 918         u16 tvlv_len = 0;
 919         unsigned long send_time;
 920
 921         if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) ||
 922             (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
 923                 return;
 924
 925         /* the interface gets activated here to avoid race conditions between
 926          * the moment of activating the interface in
 927          * hardif_activate_interface() where the originator mac is set and
 928          * outdated packets (especially uninitialized mac addresses) in the
 929          * packet queue
 930          */
 931         if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
 932                 hard_iface->if_status = BATADV_IF_ACTIVE;
 933
 934         primary_if = batadv_primary_if_get_selected(bat_priv);
 935
 936         if (hard_iface == primary_if) {
 937                 /* tt changes have to be committed before the tvlv data is
 938                  * appended as it may alter the tt tvlv container
 939                  */
 940                 batadv_tt_local_commit_changes(bat_priv);
 941                 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
 942                                                             ogm_buff_len,
 943                                                             BATADV_OGM_HLEN);
 944         }
 945
 946         batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
 947         batadv_ogm_packet->tvlv_len = htons(tvlv_len);
 948
 949         /* change sequence number to network order */
 950         seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno);
 951         batadv_ogm_packet->seqno = htonl(seqno);
 952         atomic_inc(&hard_iface->bat_iv.ogm_seqno);
 953
 954         batadv_iv_ogm_slide_own_bcast_window(hard_iface);
 955
 956         send_time = batadv_iv_ogm_emit_send_time(bat_priv);
 957
 958         if (hard_iface != primary_if) {
 959                 /* OGMs from secondary interfaces are only scheduled on their
 960                  * respective interfaces.
 961                  */
 962                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
 963                                         hard_iface, hard_iface, 1, send_time);
 964                 goto out;
 965         }
 966
 967         /* OGMs from primary interfaces are scheduled on all
 968          * interfaces.
 969          */
 970         rcu_read_lock();
 971         list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 972                 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 973                         continue;
 974
 975                 if (!kref_get_unless_zero(&tmp_hard_iface->refcount))
 976                         continue;
 977
 978                 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 979                                         *ogm_buff_len, hard_iface,
 980                                         tmp_hard_iface, 1, send_time);
 981
 982                 batadv_hardif_put(tmp_hard_iface);
 983         }
 984         rcu_read_unlock();
 985
 986 out:
 987         if (primary_if)
 988                 batadv_hardif_put(primary_if);
 989 }
 990
 991 /**
 992  * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
 993  *  originator
 994  * @bat_priv: the bat priv with all the soft interface information
 995  * @orig_node: the orig node who originally emitted the ogm packet
 996  * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
 997  * @ethhdr: Ethernet header of the OGM
 998  * @batadv_ogm_packet: the ogm packet
 999  * @if_incoming: interface where the packet was received
1000  * @if_outgoing: interface for which the retransmission should be considered
1001  * @dup_status: the duplicate status of this ogm packet.
1002  */
1003 static void
1004 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
1005                           struct batadv_orig_node *orig_node,
1006                           struct batadv_orig_ifinfo *orig_ifinfo,
1007                           const struct ethhdr *ethhdr,
1008                           const struct batadv_ogm_packet *batadv_ogm_packet,
1009                           struct batadv_hard_iface *if_incoming,
1010                           struct batadv_hard_iface *if_outgoing,
1011                           enum batadv_dup_status dup_status)
1012 {
1013         struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
1014         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1015         struct batadv_neigh_node *neigh_node = NULL;
1016         struct batadv_neigh_node *tmp_neigh_node = NULL;
1017         struct batadv_neigh_node *router = NULL;
1018         struct batadv_orig_node *orig_node_tmp;
1019         int if_num;
1020         u8 sum_orig, sum_neigh;
1021         u8 *neigh_addr;
1022         u8 tq_avg;
1023
1024         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1025                    "%s(): Searching and updating originator entry of received packet\n",
1026                    __func__);
1027
1028         rcu_read_lock();
1029         hlist_for_each_entry_rcu(tmp_neigh_node,
1030                                  &orig_node->neigh_list, list) {
1031                 neigh_addr = tmp_neigh_node->addr;
1032                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1033                     tmp_neigh_node->if_incoming == if_incoming &&
1034                     kref_get_unless_zero(&tmp_neigh_node->refcount)) {
1035                         if (WARN(neigh_node, "too many matching neigh_nodes"))
1036                                 batadv_neigh_node_put(neigh_node);
1037                         neigh_node = tmp_neigh_node;
1038                         continue;
1039                 }
1040
1041                 if (dup_status != BATADV_NO_DUP)
1042                         continue;
1043
1044                 /* only update the entry for this outgoing interface */
1045                 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1046                                                        if_outgoing);
1047                 if (!neigh_ifinfo)
1048                         continue;
1049
1050                 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1051                 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1052                                        &neigh_ifinfo->bat_iv.tq_index, 0);
1053                 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1054                 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1055                 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1056
1057                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1058                 neigh_ifinfo = NULL;
1059         }
1060
1061         if (!neigh_node) {
1062                 struct batadv_orig_node *orig_tmp;
1063
1064                 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1065                 if (!orig_tmp)
1066                         goto unlock;
1067
1068                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1069                                                      ethhdr->h_source,
1070                                                      orig_node, orig_tmp);
1071
1072                 batadv_orig_node_put(orig_tmp);
1073                 if (!neigh_node)
1074                         goto unlock;
1075         } else {
1076                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1077                            "Updating existing last-hop neighbor of originator\n");
1078         }
1079
1080         rcu_read_unlock();
1081         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1082         if (!neigh_ifinfo)
1083                 goto out;
1084
1085         neigh_node->last_seen = jiffies;
1086
1087         spin_lock_bh(&neigh_node->ifinfo_lock);
1088         batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1089                                &neigh_ifinfo->bat_iv.tq_index,
1090                                batadv_ogm_packet->tq);
1091         tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1092         neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1093         spin_unlock_bh(&neigh_node->ifinfo_lock);
1094
1095         if (dup_status == BATADV_NO_DUP) {
1096                 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1097                 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1098         }
1099
1100         /* if this neighbor already is our next hop there is nothing
1101          * to change
1102          */
1103         router = batadv_orig_router_get(orig_node, if_outgoing);
1104         if (router == neigh_node)
1105                 goto out;
1106
1107         if (router) {
1108                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1109                 if (!router_ifinfo)
1110                         goto out;
1111
1112                 /* if this neighbor does not offer a better TQ we won't
1113                  * consider it
1114                  */
1115                 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1116                         goto out;
1117         }
1118
1119         /* if the TQ is the same and the link not more symmetric we
1120          * won't consider it either
1121          */
1122         if (router_ifinfo &&
1123             neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) {
1124                 orig_node_tmp = router->orig_node;
1125                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1126                 if_num = router->if_incoming->if_num;
1127                 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1128                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1129
1130                 orig_node_tmp = neigh_node->orig_node;
1131                 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1132                 if_num = neigh_node->if_incoming->if_num;
1133                 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1134                 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1135
1136                 if (sum_orig >= sum_neigh)
1137                         goto out;
1138         }
1139
1140         batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1141         goto out;
1142
1143 unlock:
1144         rcu_read_unlock();
1145 out:
1146         if (neigh_node)
1147                 batadv_neigh_node_put(neigh_node);
1148         if (router)
1149                 batadv_neigh_node_put(router);
1150         if (neigh_ifinfo)
1151                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1152         if (router_ifinfo)
1153                 batadv_neigh_ifinfo_put(router_ifinfo);
1154 }
1155
1156 /**
1157  * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1158  * @orig_node: the orig node who originally emitted the ogm packet
1159  * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1160  * @batadv_ogm_packet: the ogm packet
1161  * @if_incoming: interface where the packet was received
1162  * @if_outgoing: interface for which the retransmission should be considered
1163  *
1164  * Return: true if the link can be considered bidirectional, false otherwise
1165  */
1166 static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1167                                   struct batadv_orig_node *orig_neigh_node,
1168                                   struct batadv_ogm_packet *batadv_ogm_packet,
1169                                   struct batadv_hard_iface *if_incoming,
1170                                   struct batadv_hard_iface *if_outgoing)
1171 {
1172         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1173         struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1174         struct batadv_neigh_ifinfo *neigh_ifinfo;
1175         u8 total_count;
1176         u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1177         unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1178         int if_num;
1179         unsigned int tq_asym_penalty, inv_asym_penalty;
1180         unsigned int combined_tq;
1181         unsigned int tq_iface_penalty;
1182         bool ret = false;
1183
1184         /* find corresponding one hop neighbor */
1185         rcu_read_lock();
1186         hlist_for_each_entry_rcu(tmp_neigh_node,
1187                                  &orig_neigh_node->neigh_list, list) {
1188                 if (!batadv_compare_eth(tmp_neigh_node->addr,
1189                                         orig_neigh_node->orig))
1190                         continue;
1191
1192                 if (tmp_neigh_node->if_incoming != if_incoming)
1193                         continue;
1194
1195                 if (!kref_get_unless_zero(&tmp_neigh_node->refcount))
1196                         continue;
1197
1198                 neigh_node = tmp_neigh_node;
1199                 break;
1200         }
1201         rcu_read_unlock();
1202
1203         if (!neigh_node)
1204                 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1205                                                      orig_neigh_node->orig,
1206                                                      orig_neigh_node,
1207                                                      orig_neigh_node);
1208
1209         if (!neigh_node)
1210                 goto out;
1211
1212         /* if orig_node is direct neighbor update neigh_node last_seen */
1213         if (orig_node == orig_neigh_node)
1214                 neigh_node->last_seen = jiffies;
1215
1216         orig_node->last_seen = jiffies;
1217
1218         /* find packet count of corresponding one hop neighbor */
1219         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1220         if_num = if_incoming->if_num;
1221         orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1222         neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1223         if (neigh_ifinfo) {
1224                 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1225                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1226         } else {
1227                 neigh_rq_count = 0;
1228         }
1229         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1230
1231         /* pay attention to not get a value bigger than 100 % */
1232         if (orig_eq_count > neigh_rq_count)
1233                 total_count = neigh_rq_count;
1234         else
1235                 total_count = orig_eq_count;
1236
1237         /* if we have too few packets (too less data) we set tq_own to zero
1238          * if we receive too few packets it is not considered bidirectional
1239          */
1240         if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1241             neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1242                 tq_own = 0;
1243         else
1244                 /* neigh_node->real_packet_count is never zero as we
1245                  * only purge old information when getting new
1246                  * information
1247                  */
1248                 tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
1249
1250         /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1251          * affect the nearly-symmetric links only a little, but
1252          * punishes asymmetric links more.  This will give a value
1253          * between 0 and TQ_MAX_VALUE
1254          */
1255         neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1256         neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1257         neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1258                             BATADV_TQ_LOCAL_WINDOW_SIZE *
1259                             BATADV_TQ_LOCAL_WINDOW_SIZE;
1260         inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1261         inv_asym_penalty /= neigh_rq_max_cube;
1262         tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1263
1264         /* penalize if the OGM is forwarded on the same interface. WiFi
1265          * interfaces and other half duplex devices suffer from throughput
1266          * drops as they can't send and receive at the same time.
1267          */
1268         tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1269         if (if_outgoing && (if_incoming == if_outgoing) &&
1270             batadv_is_wifi_hardif(if_outgoing))
1271                 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1272                                                       bat_priv);
1273
1274         combined_tq = batadv_ogm_packet->tq *
1275                       tq_own *
1276                       tq_asym_penalty *
1277                       tq_iface_penalty;
1278         combined_tq /= BATADV_TQ_MAX_VALUE *
1279                        BATADV_TQ_MAX_VALUE *
1280                        BATADV_TQ_MAX_VALUE;
1281         batadv_ogm_packet->tq = combined_tq;
1282
1283         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1284                    "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n",
1285                    orig_node->orig, orig_neigh_node->orig, total_count,
1286                    neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1287                    batadv_ogm_packet->tq, if_incoming->net_dev->name,
1288                    if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1289
1290         /* if link has the minimum required transmission quality
1291          * consider it bidirectional
1292          */
1293         if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1294                 ret = true;
1295
1296 out:
1297         if (neigh_node)
1298                 batadv_neigh_node_put(neigh_node);
1299         return ret;
1300 }
1301
1302 /**
1303  * batadv_iv_ogm_update_seqnos -  process a batman packet for all interfaces,
1304  *  adjust the sequence number and find out whether it is a duplicate
1305  * @ethhdr: ethernet header of the packet
1306  * @batadv_ogm_packet: OGM packet to be considered
1307  * @if_incoming: interface on which the OGM packet was received
1308  * @if_outgoing: interface for which the retransmission should be considered
1309  *
1310  * Return: duplicate status as enum batadv_dup_status
1311  */
1312 static enum batadv_dup_status
1313 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1314                             const struct batadv_ogm_packet *batadv_ogm_packet,
1315                             const struct batadv_hard_iface *if_incoming,
1316                             struct batadv_hard_iface *if_outgoing)
1317 {
1318         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1319         struct batadv_orig_node *orig_node;
1320         struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1321         struct batadv_neigh_node *neigh_node;
1322         struct batadv_neigh_ifinfo *neigh_ifinfo;
1323         bool is_dup;
1324         s32 seq_diff;
1325         bool need_update = false;
1326         int set_mark;
1327         enum batadv_dup_status ret = BATADV_NO_DUP;
1328         u32 seqno = ntohl(batadv_ogm_packet->seqno);
1329         u8 *neigh_addr;
1330         u8 packet_count;
1331         unsigned long *bitmap;
1332
1333         orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1334         if (!orig_node)
1335                 return BATADV_NO_DUP;
1336
1337         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1338         if (WARN_ON(!orig_ifinfo)) {
1339                 batadv_orig_node_put(orig_node);
1340                 return 0;
1341         }
1342
1343         spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1344         seq_diff = seqno - orig_ifinfo->last_real_seqno;
1345
1346         /* signalize caller that the packet is to be dropped. */
1347         if (!hlist_empty(&orig_node->neigh_list) &&
1348             batadv_window_protected(bat_priv, seq_diff,
1349                                     BATADV_TQ_LOCAL_WINDOW_SIZE,
1350                                     &orig_ifinfo->batman_seqno_reset, NULL)) {
1351                 ret = BATADV_PROTECTED;
1352                 goto out;
1353         }
1354
1355         rcu_read_lock();
1356         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1357                 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1358                                                        if_outgoing);
1359                 if (!neigh_ifinfo)
1360                         continue;
1361
1362                 neigh_addr = neigh_node->addr;
1363                 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1364                                          orig_ifinfo->last_real_seqno,
1365                                          seqno);
1366
1367                 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1368                     neigh_node->if_incoming == if_incoming) {
1369                         set_mark = 1;
1370                         if (is_dup)
1371                                 ret = BATADV_NEIGH_DUP;
1372                 } else {
1373                         set_mark = 0;
1374                         if (is_dup && (ret != BATADV_NEIGH_DUP))
1375                                 ret = BATADV_ORIG_DUP;
1376                 }
1377
1378                 /* if the window moved, set the update flag. */
1379                 bitmap = neigh_ifinfo->bat_iv.real_bits;
1380                 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1381                                                      seq_diff, set_mark);
1382
1383                 packet_count = bitmap_weight(bitmap,
1384                                              BATADV_TQ_LOCAL_WINDOW_SIZE);
1385                 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1386                 batadv_neigh_ifinfo_put(neigh_ifinfo);
1387         }
1388         rcu_read_unlock();
1389
1390         if (need_update) {
1391                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1392                            "%s updating last_seqno: old %u, new %u\n",
1393                            if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1394                            orig_ifinfo->last_real_seqno, seqno);
1395                 orig_ifinfo->last_real_seqno = seqno;
1396         }
1397
1398 out:
1399         spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1400         batadv_orig_node_put(orig_node);
1401         batadv_orig_ifinfo_put(orig_ifinfo);
1402         return ret;
1403 }
1404
1405 /**
1406  * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1407  * @skb: the skb containing the OGM
1408  * @ogm_offset: offset from skb->data to start of ogm header
1409  * @orig_node: the (cached) orig node for the originator of this OGM
1410  * @if_incoming: the interface where this packet was received
1411  * @if_outgoing: the interface for which the packet should be considered
1412  */
1413 static void
1414 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1415                                 struct batadv_orig_node *orig_node,
1416                                 struct batadv_hard_iface *if_incoming,
1417                                 struct batadv_hard_iface *if_outgoing)
1418 {
1419         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1420         struct batadv_hardif_neigh_node *hardif_neigh = NULL;
1421         struct batadv_neigh_node *router = NULL;
1422         struct batadv_neigh_node *router_router = NULL;
1423         struct batadv_orig_node *orig_neigh_node;
1424         struct batadv_orig_ifinfo *orig_ifinfo;
1425         struct batadv_neigh_node *orig_neigh_router = NULL;
1426         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1427         struct batadv_ogm_packet *ogm_packet;
1428         enum batadv_dup_status dup_status;
1429         bool is_from_best_next_hop = false;
1430         bool is_single_hop_neigh = false;
1431         bool sameseq, similar_ttl;
1432         struct sk_buff *skb_priv;
1433         struct ethhdr *ethhdr;
1434         u8 *prev_sender;
1435         bool is_bidirect;
1436
1437         /* create a private copy of the skb, as some functions change tq value
1438          * and/or flags.
1439          */
1440         skb_priv = skb_copy(skb, GFP_ATOMIC);
1441         if (!skb_priv)
1442                 return;
1443
1444         ethhdr = eth_hdr(skb_priv);
1445         ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1446
1447         dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1448                                                  if_incoming, if_outgoing);
1449         if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1450                 is_single_hop_neigh = true;
1451
1452         if (dup_status == BATADV_PROTECTED) {
1453                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1454                            "Drop packet: packet within seqno protection time (sender: %pM)\n",
1455                            ethhdr->h_source);
1456                 goto out;
1457         }
1458
1459         if (ogm_packet->tq == 0) {
1460                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1461                            "Drop packet: originator packet with tq equal 0\n");
1462                 goto out;
1463         }
1464
1465         if (is_single_hop_neigh) {
1466                 hardif_neigh = batadv_hardif_neigh_get(if_incoming,
1467                                                        ethhdr->h_source);
1468                 if (hardif_neigh)
1469                         hardif_neigh->last_seen = jiffies;
1470         }
1471
1472         router = batadv_orig_router_get(orig_node, if_outgoing);
1473         if (router) {
1474                 router_router = batadv_orig_router_get(router->orig_node,
1475                                                        if_outgoing);
1476                 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1477         }
1478
1479         if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1480             (batadv_compare_eth(router->addr, ethhdr->h_source)))
1481                 is_from_best_next_hop = true;
1482
1483         prev_sender = ogm_packet->prev_sender;
1484         /* avoid temporary routing loops */
1485         if (router && router_router &&
1486             (batadv_compare_eth(router->addr, prev_sender)) &&
1487             !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1488             (batadv_compare_eth(router->addr, router_router->addr))) {
1489                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1490                            "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1491                            ethhdr->h_source);
1492                 goto out;
1493         }
1494
1495         if (if_outgoing == BATADV_IF_DEFAULT)
1496                 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1497
1498         /* if sender is a direct neighbor the sender mac equals
1499          * originator mac
1500          */
1501         if (is_single_hop_neigh)
1502                 orig_neigh_node = orig_node;
1503         else
1504                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1505                                                          ethhdr->h_source);
1506
1507         if (!orig_neigh_node)
1508                 goto out;
1509
1510         /* Update nc_nodes of the originator */
1511         batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1512                                  ogm_packet, is_single_hop_neigh);
1513
1514         orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1515                                                    if_outgoing);
1516
1517         /* drop packet if sender is not a direct neighbor and if we
1518          * don't route towards it
1519          */
1520         if (!is_single_hop_neigh && (!orig_neigh_router)) {
1521                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1522                            "Drop packet: OGM via unknown neighbor!\n");
1523                 goto out_neigh;
1524         }
1525
1526         is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1527                                             ogm_packet, if_incoming,
1528                                             if_outgoing);
1529
1530         /* update ranking if it is not a duplicate or has the same
1531          * seqno and similar ttl as the non-duplicate
1532          */
1533         orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1534         if (!orig_ifinfo)
1535                 goto out_neigh;
1536
1537         sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1538         similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1539
1540         if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1541                             (sameseq && similar_ttl))) {
1542                 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1543                                           orig_ifinfo, ethhdr,
1544                                           ogm_packet, if_incoming,
1545                                           if_outgoing, dup_status);
1546         }
1547         batadv_orig_ifinfo_put(orig_ifinfo);
1548
1549         /* only forward for specific interface, not for the default one. */
1550         if (if_outgoing == BATADV_IF_DEFAULT)
1551                 goto out_neigh;
1552
1553         /* is single hop (direct) neighbor */
1554         if (is_single_hop_neigh) {
1555                 /* OGMs from secondary interfaces should only scheduled once
1556                  * per interface where it has been received, not multiple times
1557                  */
1558                 if ((ogm_packet->ttl <= 2) &&
1559                     (if_incoming != if_outgoing)) {
1560                         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1561                                    "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1562                         goto out_neigh;
1563                 }
1564                 /* mark direct link on incoming interface */
1565                 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1566                                       is_single_hop_neigh,
1567                                       is_from_best_next_hop, if_incoming,
1568                                       if_outgoing);
1569
1570                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1571                            "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1572                 goto out_neigh;
1573         }
1574
1575         /* multihop originator */
1576         if (!is_bidirect) {
1577                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1578                            "Drop packet: not received via bidirectional link\n");
1579                 goto out_neigh;
1580         }
1581
1582         if (dup_status == BATADV_NEIGH_DUP) {
1583                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1584                            "Drop packet: duplicate packet received\n");
1585                 goto out_neigh;
1586         }
1587
1588         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1589                    "Forwarding packet: rebroadcast originator packet\n");
1590         batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1591                               is_single_hop_neigh, is_from_best_next_hop,
1592                               if_incoming, if_outgoing);
1593
1594 out_neigh:
1595         if ((orig_neigh_node) && (!is_single_hop_neigh))
1596                 batadv_orig_node_put(orig_neigh_node);
1597 out:
1598         if (router_ifinfo)
1599                 batadv_neigh_ifinfo_put(router_ifinfo);
1600         if (router)
1601                 batadv_neigh_node_put(router);
1602         if (router_router)
1603                 batadv_neigh_node_put(router_router);
1604         if (orig_neigh_router)
1605                 batadv_neigh_node_put(orig_neigh_router);
1606         if (hardif_neigh)
1607                 batadv_hardif_neigh_put(hardif_neigh);
1608
1609         consume_skb(skb_priv);
1610 }
1611
1612 /**
1613  * batadv_iv_ogm_process - process an incoming batman iv OGM
1614  * @skb: the skb containing the OGM
1615  * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1616  * @if_incoming: the interface where this packet was receved
1617  */
1618 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1619                                   struct batadv_hard_iface *if_incoming)
1620 {
1621         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1622         struct batadv_orig_node *orig_neigh_node, *orig_node;
1623         struct batadv_hard_iface *hard_iface;
1624         struct batadv_ogm_packet *ogm_packet;
1625         u32 if_incoming_seqno;
1626         bool has_directlink_flag;
1627         struct ethhdr *ethhdr;
1628         bool is_my_oldorig = false;
1629         bool is_my_addr = false;
1630         bool is_my_orig = false;
1631
1632         ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1633         ethhdr = eth_hdr(skb);
1634
1635         /* Silently drop when the batman packet is actually not a
1636          * correct packet.
1637          *
1638          * This might happen if a packet is padded (e.g. Ethernet has a
1639          * minimum frame length of 64 byte) and the aggregation interprets
1640          * it as an additional length.
1641          *
1642          * TODO: A more sane solution would be to have a bit in the
1643          * batadv_ogm_packet to detect whether the packet is the last
1644          * packet in an aggregation.  Here we expect that the padding
1645          * is always zero (or not 0x01)
1646          */
1647         if (ogm_packet->packet_type != BATADV_IV_OGM)
1648                 return;
1649
1650         /* could be changed by schedule_own_packet() */
1651         if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1652
1653         if (ogm_packet->flags & BATADV_DIRECTLINK)
1654                 has_directlink_flag = true;
1655         else
1656                 has_directlink_flag = false;
1657
1658         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1659                    "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",
1660                    ethhdr->h_source, if_incoming->net_dev->name,
1661                    if_incoming->net_dev->dev_addr, ogm_packet->orig,
1662                    ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1663                    ogm_packet->tq, ogm_packet->ttl,
1664                    ogm_packet->version, has_directlink_flag);
1665
1666         rcu_read_lock();
1667         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1668                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1669                         continue;
1670
1671                 if (hard_iface->soft_iface != if_incoming->soft_iface)
1672                         continue;
1673
1674                 if (batadv_compare_eth(ethhdr->h_source,
1675                                        hard_iface->net_dev->dev_addr))
1676                         is_my_addr = true;
1677
1678                 if (batadv_compare_eth(ogm_packet->orig,
1679                                        hard_iface->net_dev->dev_addr))
1680                         is_my_orig = true;
1681
1682                 if (batadv_compare_eth(ogm_packet->prev_sender,
1683                                        hard_iface->net_dev->dev_addr))
1684                         is_my_oldorig = true;
1685         }
1686         rcu_read_unlock();
1687
1688         if (is_my_addr) {
1689                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1690                            "Drop packet: received my own broadcast (sender: %pM)\n",
1691                            ethhdr->h_source);
1692                 return;
1693         }
1694
1695         if (is_my_orig) {
1696                 unsigned long *word;
1697                 int offset;
1698                 s32 bit_pos;
1699                 s16 if_num;
1700                 u8 *weight;
1701
1702                 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1703                                                          ethhdr->h_source);
1704                 if (!orig_neigh_node)
1705                         return;
1706
1707                 /* neighbor has to indicate direct link and it has to
1708                  * come via the corresponding interface
1709                  * save packet seqno for bidirectional check
1710                  */
1711                 if (has_directlink_flag &&
1712                     batadv_compare_eth(if_incoming->net_dev->dev_addr,
1713                                        ogm_packet->orig)) {
1714                         if_num = if_incoming->if_num;
1715                         offset = if_num * BATADV_NUM_WORDS;
1716
1717                         spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1718                         word = &orig_neigh_node->bat_iv.bcast_own[offset];
1719                         bit_pos = if_incoming_seqno - 2;
1720                         bit_pos -= ntohl(ogm_packet->seqno);
1721                         batadv_set_bit(word, bit_pos);
1722                         weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1723                         *weight = bitmap_weight(word,
1724                                                 BATADV_TQ_LOCAL_WINDOW_SIZE);
1725                         spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1726                 }
1727
1728                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1729                            "Drop packet: originator packet from myself (via neighbor)\n");
1730                 batadv_orig_node_put(orig_neigh_node);
1731                 return;
1732         }
1733
1734         if (is_my_oldorig) {
1735                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1736                            "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1737                            ethhdr->h_source);
1738                 return;
1739         }
1740
1741         if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1742                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1743                            "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1744                            ethhdr->h_source);
1745                 return;
1746         }
1747
1748         orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1749         if (!orig_node)
1750                 return;
1751
1752         batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1753                                         if_incoming, BATADV_IF_DEFAULT);
1754
1755         rcu_read_lock();
1756         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1757                 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1758                         continue;
1759
1760                 if (hard_iface->soft_iface != bat_priv->soft_iface)
1761                         continue;
1762
1763                 if (!kref_get_unless_zero(&hard_iface->refcount))
1764                         continue;
1765
1766                 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1767                                                 if_incoming, hard_iface);
1768
1769                 batadv_hardif_put(hard_iface);
1770         }
1771         rcu_read_unlock();
1772
1773         batadv_orig_node_put(orig_node);
1774 }
1775
1776 static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work)
1777 {
1778         struct delayed_work *delayed_work;
1779         struct batadv_forw_packet *forw_packet;
1780         struct batadv_priv *bat_priv;
1781         bool dropped = false;
1782
1783         delayed_work = to_delayed_work(work);
1784         forw_packet = container_of(delayed_work, struct batadv_forw_packet,
1785                                    delayed_work);
1786         bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
1787
1788         if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) {
1789                 dropped = true;
1790                 goto out;
1791         }
1792
1793         batadv_iv_ogm_emit(forw_packet);
1794
1795         /* we have to have at least one packet in the queue to determine the
1796          * queues wake up time unless we are shutting down.
1797          *
1798          * only re-schedule if this is the "original" copy, e.g. the OGM of the
1799          * primary interface should only be rescheduled once per period, but
1800          * this function will be called for the forw_packet instances of the
1801          * other secondary interfaces as well.
1802          */
1803         if (forw_packet->own &&
1804             forw_packet->if_incoming == forw_packet->if_outgoing)
1805                 batadv_iv_ogm_schedule(forw_packet->if_incoming);
1806
1807 out:
1808         /* do we get something for free()? */
1809         if (batadv_forw_packet_steal(forw_packet,
1810                                      &bat_priv->forw_bat_list_lock))
1811                 batadv_forw_packet_free(forw_packet, dropped);
1812 }
1813
1814 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1815                                  struct batadv_hard_iface *if_incoming)
1816 {
1817         struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1818         struct batadv_ogm_packet *ogm_packet;
1819         u8 *packet_pos;
1820         int ogm_offset;
1821         bool res;
1822         int ret = NET_RX_DROP;
1823
1824         res = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1825         if (!res)
1826                 goto free_skb;
1827
1828         /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1829          * that does not have B.A.T.M.A.N. IV enabled ?
1830          */
1831         if (bat_priv->algo_ops->iface.enable != batadv_iv_ogm_iface_enable)
1832                 goto free_skb;
1833
1834         batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1835         batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1836                            skb->len + ETH_HLEN);
1837
1838         ogm_offset = 0;
1839         ogm_packet = (struct batadv_ogm_packet *)skb->data;
1840
1841         /* unpack the aggregated packets and process them one by one */
1842         while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1843                                          ogm_packet->tvlv_len)) {
1844                 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1845
1846                 ogm_offset += BATADV_OGM_HLEN;
1847                 ogm_offset += ntohs(ogm_packet->tvlv_len);
1848
1849                 packet_pos = skb->data + ogm_offset;
1850                 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1851         }
1852
1853         ret = NET_RX_SUCCESS;
1854
1855 free_skb:
1856         if (ret == NET_RX_SUCCESS)
1857                 consume_skb(skb);
1858         else
1859                 kfree_skb(skb);
1860
1861         return ret;
1862 }
1863
1864 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1865 /**
1866  * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1867  * @orig_node: the orig_node for which the neighbors are printed
1868  * @if_outgoing: outgoing interface for these entries
1869  * @seq: debugfs table seq_file struct
1870  *
1871  * Must be called while holding an rcu lock.
1872  */
1873 static void
1874 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1875                                struct batadv_hard_iface *if_outgoing,
1876                                struct seq_file *seq)
1877 {
1878         struct batadv_neigh_node *neigh_node;
1879         struct batadv_neigh_ifinfo *n_ifinfo;
1880
1881         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1882                 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1883                 if (!n_ifinfo)
1884                         continue;
1885
1886                 seq_printf(seq, " %pM (%3i)",
1887                            neigh_node->addr,
1888                            n_ifinfo->bat_iv.tq_avg);
1889
1890                 batadv_neigh_ifinfo_put(n_ifinfo);
1891         }
1892 }
1893
1894 /**
1895  * batadv_iv_ogm_orig_print - print the originator table
1896  * @bat_priv: the bat priv with all the soft interface information
1897  * @seq: debugfs table seq_file struct
1898  * @if_outgoing: the outgoing interface for which this should be printed
1899  */
1900 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1901                                      struct seq_file *seq,
1902                                      struct batadv_hard_iface *if_outgoing)
1903 {
1904         struct batadv_neigh_node *neigh_node;
1905         struct batadv_hashtable *hash = bat_priv->orig_hash;
1906         int last_seen_msecs, last_seen_secs;
1907         struct batadv_orig_node *orig_node;
1908         struct batadv_neigh_ifinfo *n_ifinfo;
1909         unsigned long last_seen_jiffies;
1910         struct hlist_head *head;
1911         int batman_count = 0;
1912         u32 i;
1913
1914         seq_puts(seq,
1915                  "  Originator      last-seen (#/255)           Nexthop [outgoingIF]:   Potential nexthops ...\n");
1916
1917         for (i = 0; i < hash->size; i++) {
1918                 head = &hash->table[i];
1919
1920                 rcu_read_lock();
1921                 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1922                         neigh_node = batadv_orig_router_get(orig_node,
1923                                                             if_outgoing);
1924                         if (!neigh_node)
1925                                 continue;
1926
1927                         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1928                                                            if_outgoing);
1929                         if (!n_ifinfo)
1930                                 goto next;
1931
1932                         if (n_ifinfo->bat_iv.tq_avg == 0)
1933                                 goto next;
1934
1935                         last_seen_jiffies = jiffies - orig_node->last_seen;
1936                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1937                         last_seen_secs = last_seen_msecs / 1000;
1938                         last_seen_msecs = last_seen_msecs % 1000;
1939
1940                         seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
1941                                    orig_node->orig, last_seen_secs,
1942                                    last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1943                                    neigh_node->addr,
1944                                    neigh_node->if_incoming->net_dev->name);
1945
1946                         batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1947                                                        seq);
1948                         seq_putc(seq, '\n');
1949                         batman_count++;
1950
1951 next:
1952                         batadv_neigh_node_put(neigh_node);
1953                         if (n_ifinfo)
1954                                 batadv_neigh_ifinfo_put(n_ifinfo);
1955                 }
1956                 rcu_read_unlock();
1957         }
1958
1959         if (batman_count == 0)
1960                 seq_puts(seq, "No batman nodes in range ...\n");
1961 }
1962 #endif
1963
1964 /**
1965  * batadv_iv_ogm_neigh_get_tq_avg - Get the TQ average for a neighbour on a
1966  *  given outgoing interface.
1967  * @neigh_node: Neighbour of interest
1968  * @if_outgoing: Outgoing interface of interest
1969  * @tq_avg: Pointer of where to store the TQ average
1970  *
1971  * Return: False if no average TQ available, otherwise true.
1972  */
1973 static bool
1974 batadv_iv_ogm_neigh_get_tq_avg(struct batadv_neigh_node *neigh_node,
1975                                struct batadv_hard_iface *if_outgoing,
1976                                u8 *tq_avg)
1977 {
1978         struct batadv_neigh_ifinfo *n_ifinfo;
1979
1980         n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1981         if (!n_ifinfo)
1982                 return false;
1983
1984         *tq_avg = n_ifinfo->bat_iv.tq_avg;
1985         batadv_neigh_ifinfo_put(n_ifinfo);
1986
1987         return true;
1988 }
1989
1990 /**
1991  * batadv_iv_ogm_orig_dump_subentry - Dump an originator subentry into a
1992  *  message
1993  * @msg: Netlink message to dump into
1994  * @portid: Port making netlink request
1995  * @seq: Sequence number of netlink message
1996  * @bat_priv: The bat priv with all the soft interface information
1997  * @if_outgoing: Limit dump to entries with this outgoing interface
1998  * @orig_node: Originator to dump
1999  * @neigh_node: Single hops neighbour
2000  * @best: Is the best originator
2001  *
2002  * Return: Error code, or 0 on success
2003  */
2004 static int
2005 batadv_iv_ogm_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
2006                                  struct batadv_priv *bat_priv,
2007                                  struct batadv_hard_iface *if_outgoing,
2008                                  struct batadv_orig_node *orig_node,
2009                                  struct batadv_neigh_node *neigh_node,
2010                                  bool best)
2011 {
2012         void *hdr;
2013         u8 tq_avg;
2014         unsigned int last_seen_msecs;
2015
2016         last_seen_msecs = jiffies_to_msecs(jiffies - orig_node->last_seen);
2017
2018         if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node, if_outgoing, &tq_avg))
2019                 return 0;
2020
2021         if (if_outgoing != BATADV_IF_DEFAULT &&
2022             if_outgoing != neigh_node->if_incoming)
2023                 return 0;
2024
2025         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2026                           NLM_F_MULTI, BATADV_CMD_GET_ORIGINATORS);
2027         if (!hdr)
2028                 return -ENOBUFS;
2029
2030         if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2031                     orig_node->orig) ||
2032             nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
2033                     neigh_node->addr) ||
2034             nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
2035                         neigh_node->if_incoming->net_dev->ifindex) ||
2036             nla_put_u8(msg, BATADV_ATTR_TQ, tq_avg) ||
2037             nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
2038                         last_seen_msecs))
2039                 goto nla_put_failure;
2040
2041         if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
2042                 goto nla_put_failure;
2043
2044         genlmsg_end(msg, hdr);
2045         return 0;
2046
2047  nla_put_failure:
2048         genlmsg_cancel(msg, hdr);
2049         return -EMSGSIZE;
2050 }
2051
2052 /**
2053  * batadv_iv_ogm_orig_dump_entry - Dump an originator entry into a message
2054  * @msg: Netlink message to dump into
2055  * @portid: Port making netlink request
2056  * @seq: Sequence number of netlink message
2057  * @bat_priv: The bat priv with all the soft interface information
2058  * @if_outgoing: Limit dump to entries with this outgoing interface
2059  * @orig_node: Originator to dump
2060  * @sub_s: Number of sub entries to skip
2061  *
2062  * This function assumes the caller holds rcu_read_lock().
2063  *
2064  * Return: Error code, or 0 on success
2065  */
2066 static int
2067 batadv_iv_ogm_orig_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2068                               struct batadv_priv *bat_priv,
2069                               struct batadv_hard_iface *if_outgoing,
2070                               struct batadv_orig_node *orig_node, int *sub_s)
2071 {
2072         struct batadv_neigh_node *neigh_node_best;
2073         struct batadv_neigh_node *neigh_node;
2074         int sub = 0;
2075         bool best;
2076         u8 tq_avg_best;
2077
2078         neigh_node_best = batadv_orig_router_get(orig_node, if_outgoing);
2079         if (!neigh_node_best)
2080                 goto out;
2081
2082         if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node_best, if_outgoing,
2083                                             &tq_avg_best))
2084                 goto out;
2085
2086         if (tq_avg_best == 0)
2087                 goto out;
2088
2089         hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
2090                 if (sub++ < *sub_s)
2091                         continue;
2092
2093                 best = (neigh_node == neigh_node_best);
2094
2095                 if (batadv_iv_ogm_orig_dump_subentry(msg, portid, seq,
2096                                                      bat_priv, if_outgoing,
2097                                                      orig_node, neigh_node,
2098                                                      best)) {
2099                         batadv_neigh_node_put(neigh_node_best);
2100
2101                         *sub_s = sub - 1;
2102                         return -EMSGSIZE;
2103                 }
2104         }
2105
2106  out:
2107         if (neigh_node_best)
2108                 batadv_neigh_node_put(neigh_node_best);
2109
2110         *sub_s = 0;
2111         return 0;
2112 }
2113
2114 /**
2115  * batadv_iv_ogm_orig_dump_bucket - Dump an originator bucket into a
2116  *  message
2117  * @msg: Netlink message to dump into
2118  * @portid: Port making netlink request
2119  * @seq: Sequence number of netlink message
2120  * @bat_priv: The bat priv with all the soft interface information
2121  * @if_outgoing: Limit dump to entries with this outgoing interface
2122  * @head: Bucket to be dumped
2123  * @idx_s: Number of entries to be skipped
2124  * @sub: Number of sub entries to be skipped
2125  *
2126  * Return: Error code, or 0 on success
2127  */
2128 static int
2129 batadv_iv_ogm_orig_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2130                                struct batadv_priv *bat_priv,
2131                                struct batadv_hard_iface *if_outgoing,
2132                                struct hlist_head *head, int *idx_s, int *sub)
2133 {
2134         struct batadv_orig_node *orig_node;
2135         int idx = 0;
2136
2137         rcu_read_lock();
2138         hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
2139                 if (idx++ < *idx_s)
2140                         continue;
2141
2142                 if (batadv_iv_ogm_orig_dump_entry(msg, portid, seq, bat_priv,
2143                                                   if_outgoing, orig_node,
2144                                                   sub)) {
2145                         rcu_read_unlock();
2146                         *idx_s = idx - 1;
2147                         return -EMSGSIZE;
2148                 }
2149         }
2150         rcu_read_unlock();
2151
2152         *idx_s = 0;
2153         *sub = 0;
2154         return 0;
2155 }
2156
2157 /**
2158  * batadv_iv_ogm_orig_dump - Dump the originators into a message
2159  * @msg: Netlink message to dump into
2160  * @cb: Control block containing additional options
2161  * @bat_priv: The bat priv with all the soft interface information
2162  * @if_outgoing: Limit dump to entries with this outgoing interface
2163  */
2164 static void
2165 batadv_iv_ogm_orig_dump(struct sk_buff *msg, struct netlink_callback *cb,
2166                         struct batadv_priv *bat_priv,
2167                         struct batadv_hard_iface *if_outgoing)
2168 {
2169         struct batadv_hashtable *hash = bat_priv->orig_hash;
2170         struct hlist_head *head;
2171         int bucket = cb->args[0];
2172         int idx = cb->args[1];
2173         int sub = cb->args[2];
2174         int portid = NETLINK_CB(cb->skb).portid;
2175
2176         while (bucket < hash->size) {
2177                 head = &hash->table[bucket];
2178
2179                 if (batadv_iv_ogm_orig_dump_bucket(msg, portid,
2180                                                    cb->nlh->nlmsg_seq,
2181                                                    bat_priv, if_outgoing, head,
2182                                                    &idx, &sub))
2183                         break;
2184
2185                 bucket++;
2186         }
2187
2188         cb->args[0] = bucket;
2189         cb->args[1] = idx;
2190         cb->args[2] = sub;
2191 }
2192
2193 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2194 /**
2195  * batadv_iv_hardif_neigh_print - print a single hop neighbour node
2196  * @seq: neighbour table seq_file struct
2197  * @hardif_neigh: hardif neighbour information
2198  */
2199 static void
2200 batadv_iv_hardif_neigh_print(struct seq_file *seq,
2201                              struct batadv_hardif_neigh_node *hardif_neigh)
2202 {
2203         int last_secs, last_msecs;
2204
2205         last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
2206         last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
2207
2208         seq_printf(seq, "   %10s   %pM %4i.%03is\n",
2209                    hardif_neigh->if_incoming->net_dev->name,
2210                    hardif_neigh->addr, last_secs, last_msecs);
2211 }
2212
2213 /**
2214  * batadv_iv_ogm_neigh_print - print the single hop neighbour list
2215  * @bat_priv: the bat priv with all the soft interface information
2216  * @seq: neighbour table seq_file struct
2217  */
2218 static void batadv_iv_neigh_print(struct batadv_priv *bat_priv,
2219                                   struct seq_file *seq)
2220 {
2221         struct net_device *net_dev = (struct net_device *)seq->private;
2222         struct batadv_hardif_neigh_node *hardif_neigh;
2223         struct batadv_hard_iface *hard_iface;
2224         int batman_count = 0;
2225
2226         seq_puts(seq, "           IF        Neighbor      last-seen\n");
2227
2228         rcu_read_lock();
2229         list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
2230                 if (hard_iface->soft_iface != net_dev)
2231                         continue;
2232
2233                 hlist_for_each_entry_rcu(hardif_neigh,
2234                                          &hard_iface->neigh_list, list) {
2235                         batadv_iv_hardif_neigh_print(seq, hardif_neigh);
2236                         batman_count++;
2237                 }
2238         }
2239         rcu_read_unlock();
2240
2241         if (batman_count == 0)
2242                 seq_puts(seq, "No batman nodes in range ...\n");
2243 }
2244 #endif
2245
2246 /**
2247  * batadv_iv_ogm_neigh_diff - calculate tq difference of two neighbors
2248  * @neigh1: the first neighbor object of the comparison
2249  * @if_outgoing1: outgoing interface for the first neighbor
2250  * @neigh2: the second neighbor object of the comparison
2251  * @if_outgoing2: outgoing interface for the second neighbor
2252  * @diff: pointer to integer receiving the calculated difference
2253  *
2254  * The content of *@diff is only valid when this function returns true.
2255  * It is less, equal to or greater than 0 if the metric via neigh1 is lower,
2256  * the same as or higher than the metric via neigh2
2257  *
2258  * Return: true when the difference could be calculated, false otherwise
2259  */
2260 static bool batadv_iv_ogm_neigh_diff(struct batadv_neigh_node *neigh1,
2261                                      struct batadv_hard_iface *if_outgoing1,
2262                                      struct batadv_neigh_node *neigh2,
2263                                      struct batadv_hard_iface *if_outgoing2,
2264                                      int *diff)
2265 {
2266         struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
2267         u8 tq1, tq2;
2268         bool ret = true;
2269
2270         neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
2271         neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
2272
2273         if (!neigh1_ifinfo || !neigh2_ifinfo) {
2274                 ret = false;
2275                 goto out;
2276         }
2277
2278         tq1 = neigh1_ifinfo->bat_iv.tq_avg;
2279         tq2 = neigh2_ifinfo->bat_iv.tq_avg;
2280         *diff = (int)tq1 - (int)tq2;
2281
2282 out:
2283         if (neigh1_ifinfo)
2284                 batadv_neigh_ifinfo_put(neigh1_ifinfo);
2285         if (neigh2_ifinfo)
2286                 batadv_neigh_ifinfo_put(neigh2_ifinfo);
2287
2288         return ret;
2289 }
2290
2291 /**
2292  * batadv_iv_ogm_neigh_dump_neigh - Dump a neighbour into a netlink message
2293  * @msg: Netlink message to dump into
2294  * @portid: Port making netlink request
2295  * @seq: Sequence number of netlink message
2296  * @hardif_neigh: Neighbour to be dumped
2297  *
2298  * Return: Error code, or 0 on success
2299  */
2300 static int
2301 batadv_iv_ogm_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq,
2302                                struct batadv_hardif_neigh_node *hardif_neigh)
2303 {
2304         void *hdr;
2305         unsigned int last_seen_msecs;
2306
2307         last_seen_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen);
2308
2309         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2310                           NLM_F_MULTI, BATADV_CMD_GET_NEIGHBORS);
2311         if (!hdr)
2312                 return -ENOBUFS;
2313
2314         if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
2315                     hardif_neigh->addr) ||
2316             nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
2317                         hardif_neigh->if_incoming->net_dev->ifindex) ||
2318             nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
2319                         last_seen_msecs))
2320                 goto nla_put_failure;
2321
2322         genlmsg_end(msg, hdr);
2323         return 0;
2324
2325  nla_put_failure:
2326         genlmsg_cancel(msg, hdr);
2327         return -EMSGSIZE;
2328 }
2329
2330 /**
2331  * batadv_iv_ogm_neigh_dump_hardif - Dump the neighbours of a hard interface
2332  *  into a message
2333  * @msg: Netlink message to dump into
2334  * @portid: Port making netlink request
2335  * @seq: Sequence number of netlink message
2336  * @bat_priv: The bat priv with all the soft interface information
2337  * @hard_iface: Hard interface to dump the neighbours for
2338  * @idx_s: Number of entries to skip
2339  *
2340  * This function assumes the caller holds rcu_read_lock().
2341  *
2342  * Return: Error code, or 0 on success
2343  */
2344 static int
2345 batadv_iv_ogm_neigh_dump_hardif(struct sk_buff *msg, u32 portid, u32 seq,
2346                                 struct batadv_priv *bat_priv,
2347                                 struct batadv_hard_iface *hard_iface,
2348                                 int *idx_s)
2349 {
2350         struct batadv_hardif_neigh_node *hardif_neigh;
2351         int idx = 0;
2352
2353         hlist_for_each_entry_rcu(hardif_neigh,
2354                                  &hard_iface->neigh_list, list) {
2355                 if (idx++ < *idx_s)
2356                         continue;
2357
2358                 if (batadv_iv_ogm_neigh_dump_neigh(msg, portid, seq,
2359                                                    hardif_neigh)) {
2360                         *idx_s = idx - 1;
2361                         return -EMSGSIZE;
2362                 }
2363         }
2364
2365         *idx_s = 0;
2366         return 0;
2367 }
2368
2369 /**
2370  * batadv_iv_ogm_neigh_dump - Dump the neighbours into a message
2371  * @msg: Netlink message to dump into
2372  * @cb: Control block containing additional options
2373  * @bat_priv: The bat priv with all the soft interface information
2374  * @single_hardif: Limit dump to this hard interfaace
2375  */
2376 static void
2377 batadv_iv_ogm_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb,
2378                          struct batadv_priv *bat_priv,
2379                          struct batadv_hard_iface *single_hardif)
2380 {
2381         struct batadv_hard_iface *hard_iface;
2382         int i_hardif = 0;
2383         int i_hardif_s = cb->args[0];
2384         int idx = cb->args[1];
2385         int portid = NETLINK_CB(cb->skb).portid;
2386
2387         rcu_read_lock();
2388         if (single_hardif) {
2389                 if (i_hardif_s == 0) {
2390                         if (batadv_iv_ogm_neigh_dump_hardif(msg, portid,
2391                                                             cb->nlh->nlmsg_seq,
2392                                                             bat_priv,
2393                                                             single_hardif,
2394                                                             &idx) == 0)
2395                                 i_hardif++;
2396                 }
2397         } else {
2398                 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list,
2399                                         list) {
2400                         if (hard_iface->soft_iface != bat_priv->soft_iface)
2401                                 continue;
2402
2403                         if (i_hardif++ < i_hardif_s)
2404                                 continue;
2405
2406                         if (batadv_iv_ogm_neigh_dump_hardif(msg, portid,
2407                                                             cb->nlh->nlmsg_seq,
2408                                                             bat_priv,
2409                                                             hard_iface, &idx)) {
2410                                 i_hardif--;
2411                                 break;
2412                         }
2413                 }
2414         }
2415         rcu_read_unlock();
2416
2417         cb->args[0] = i_hardif;
2418         cb->args[1] = idx;
2419 }
2420
2421 /**
2422  * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
2423  * @neigh1: the first neighbor object of the comparison
2424  * @if_outgoing1: outgoing interface for the first neighbor
2425  * @neigh2: the second neighbor object of the comparison
2426  * @if_outgoing2: outgoing interface for the second neighbor
2427  *
2428  * Return: a value less, equal to or greater than 0 if the metric via neigh1 is
2429  * lower, the same as or higher than the metric via neigh2
2430  */
2431 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
2432                                    struct batadv_hard_iface *if_outgoing1,
2433                                    struct batadv_neigh_node *neigh2,
2434                                    struct batadv_hard_iface *if_outgoing2)
2435 {
2436         bool ret;
2437         int diff;
2438
2439         ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2,
2440                                        if_outgoing2, &diff);
2441         if (!ret)
2442                 return 0;
2443
2444         return diff;
2445 }
2446
2447 /**
2448  * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better
2449  *  than neigh2 from the metric prospective
2450  * @neigh1: the first neighbor object of the comparison
2451  * @if_outgoing1: outgoing interface for the first neighbor
2452  * @neigh2: the second neighbor object of the comparison
2453  * @if_outgoing2: outgoing interface for the second neighbor
2454  *
2455  * Return: true if the metric via neigh1 is equally good or better than
2456  * the metric via neigh2, false otherwise.
2457  */
2458 static bool
2459 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1,
2460                            struct batadv_hard_iface *if_outgoing1,
2461                            struct batadv_neigh_node *neigh2,
2462                            struct batadv_hard_iface *if_outgoing2)
2463 {
2464         bool ret;
2465         int diff;
2466
2467         ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2,
2468                                        if_outgoing2, &diff);
2469         if (!ret)
2470                 return false;
2471
2472         ret = diff > -BATADV_TQ_SIMILARITY_THRESHOLD;
2473         return ret;
2474 }
2475
2476 static void batadv_iv_iface_activate(struct batadv_hard_iface *hard_iface)
2477 {
2478         /* begin scheduling originator messages on that interface */
2479         batadv_iv_ogm_schedule(hard_iface);
2480 }
2481
2482 /**
2483  * batadv_iv_init_sel_class - initialize GW selection class
2484  * @bat_priv: the bat priv with all the soft interface information
2485  */
2486 static void batadv_iv_init_sel_class(struct batadv_priv *bat_priv)
2487 {
2488         /* set default TQ difference threshold to 20 */
2489         atomic_set(&bat_priv->gw.sel_class, 20);
2490 }
2491
2492 static struct batadv_gw_node *
2493 batadv_iv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
2494 {
2495         struct batadv_neigh_node *router;
2496         struct batadv_neigh_ifinfo *router_ifinfo;
2497         struct batadv_gw_node *gw_node, *curr_gw = NULL;
2498         u64 max_gw_factor = 0;
2499         u64 tmp_gw_factor = 0;
2500         u8 max_tq = 0;
2501         u8 tq_avg;
2502         struct batadv_orig_node *orig_node;
2503
2504         rcu_read_lock();
2505         hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) {
2506                 orig_node = gw_node->orig_node;
2507                 router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
2508                 if (!router)
2509                         continue;
2510
2511                 router_ifinfo = batadv_neigh_ifinfo_get(router,
2512                                                         BATADV_IF_DEFAULT);
2513                 if (!router_ifinfo)
2514                         goto next;
2515
2516                 if (!kref_get_unless_zero(&gw_node->refcount))
2517                         goto next;
2518
2519                 tq_avg = router_ifinfo->bat_iv.tq_avg;
2520
2521                 switch (atomic_read(&bat_priv->gw.sel_class)) {
2522                 case 1: /* fast connection */
2523                         tmp_gw_factor = tq_avg * tq_avg;
2524                         tmp_gw_factor *= gw_node->bandwidth_down;
2525                         tmp_gw_factor *= 100 * 100;
2526                         tmp_gw_factor >>= 18;
2527
2528                         if ((tmp_gw_factor > max_gw_factor) ||
2529                             ((tmp_gw_factor == max_gw_factor) &&
2530                              (tq_avg > max_tq))) {
2531                                 if (curr_gw)
2532                                         batadv_gw_node_put(curr_gw);
2533                                 curr_gw = gw_node;
2534                                 kref_get(&curr_gw->refcount);
2535                         }
2536                         break;
2537
2538                 default: /* 2:  stable connection (use best statistic)
2539                           * 3:  fast-switch (use best statistic but change as
2540                           *     soon as a better gateway appears)
2541                           * XX: late-switch (use best statistic but change as
2542                           *     soon as a better gateway appears which has
2543                           *     $routing_class more tq points)
2544                           */
2545                         if (tq_avg > max_tq) {
2546                                 if (curr_gw)
2547                                         batadv_gw_node_put(curr_gw);
2548                                 curr_gw = gw_node;
2549                                 kref_get(&curr_gw->refcount);
2550                         }
2551                         break;
2552                 }
2553
2554                 if (tq_avg > max_tq)
2555                         max_tq = tq_avg;
2556
2557                 if (tmp_gw_factor > max_gw_factor)
2558                         max_gw_factor = tmp_gw_factor;
2559
2560                 batadv_gw_node_put(gw_node);
2561
2562 next:
2563                 batadv_neigh_node_put(router);
2564                 if (router_ifinfo)
2565                         batadv_neigh_ifinfo_put(router_ifinfo);
2566         }
2567         rcu_read_unlock();
2568
2569         return curr_gw;
2570 }
2571
2572 static bool batadv_iv_gw_is_eligible(struct batadv_priv *bat_priv,
2573                                      struct batadv_orig_node *curr_gw_orig,
2574                                      struct batadv_orig_node *orig_node)
2575 {
2576         struct batadv_neigh_ifinfo *router_orig_ifinfo = NULL;
2577         struct batadv_neigh_ifinfo *router_gw_ifinfo = NULL;
2578         struct batadv_neigh_node *router_gw = NULL;
2579         struct batadv_neigh_node *router_orig = NULL;
2580         u8 gw_tq_avg, orig_tq_avg;
2581         bool ret = false;
2582
2583         /* dynamic re-election is performed only on fast or late switch */
2584         if (atomic_read(&bat_priv->gw.sel_class) <= 2)
2585                 return false;
2586
2587         router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT);
2588         if (!router_gw) {
2589                 ret = true;
2590                 goto out;
2591         }
2592
2593         router_gw_ifinfo = batadv_neigh_ifinfo_get(router_gw,
2594                                                    BATADV_IF_DEFAULT);
2595         if (!router_gw_ifinfo) {
2596                 ret = true;
2597                 goto out;
2598         }
2599
2600         router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
2601         if (!router_orig)
2602                 goto out;
2603
2604         router_orig_ifinfo = batadv_neigh_ifinfo_get(router_orig,
2605                                                      BATADV_IF_DEFAULT);
2606         if (!router_orig_ifinfo)
2607                 goto out;
2608
2609         gw_tq_avg = router_gw_ifinfo->bat_iv.tq_avg;
2610         orig_tq_avg = router_orig_ifinfo->bat_iv.tq_avg;
2611
2612         /* the TQ value has to be better */
2613         if (orig_tq_avg < gw_tq_avg)
2614                 goto out;
2615
2616         /* if the routing class is greater than 3 the value tells us how much
2617          * greater the TQ value of the new gateway must be
2618          */
2619         if ((atomic_read(&bat_priv->gw.sel_class) > 3) &&
2620             (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw.sel_class)))
2621                 goto out;
2622
2623         batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
2624                    "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n",
2625                    gw_tq_avg, orig_tq_avg);
2626
2627         ret = true;
2628 out:
2629         if (router_gw_ifinfo)
2630                 batadv_neigh_ifinfo_put(router_gw_ifinfo);
2631         if (router_orig_ifinfo)
2632                 batadv_neigh_ifinfo_put(router_orig_ifinfo);
2633         if (router_gw)
2634                 batadv_neigh_node_put(router_gw);
2635         if (router_orig)
2636                 batadv_neigh_node_put(router_orig);
2637
2638         return ret;
2639 }
2640
2641 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2642 /* fails if orig_node has no router */
2643 static int batadv_iv_gw_write_buffer_text(struct batadv_priv *bat_priv,
2644                                           struct seq_file *seq,
2645                                           const struct batadv_gw_node *gw_node)
2646 {
2647         struct batadv_gw_node *curr_gw;
2648         struct batadv_neigh_node *router;
2649         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
2650         int ret = -1;
2651
2652         router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
2653         if (!router)
2654                 goto out;
2655
2656         router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
2657         if (!router_ifinfo)
2658                 goto out;
2659
2660         curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
2661
2662         seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n",
2663                    (curr_gw == gw_node ? "=>" : "  "),
2664                    gw_node->orig_node->orig,
2665                    router_ifinfo->bat_iv.tq_avg, router->addr,
2666                    router->if_incoming->net_dev->name,
2667                    gw_node->bandwidth_down / 10,
2668                    gw_node->bandwidth_down % 10,
2669                    gw_node->bandwidth_up / 10,
2670                    gw_node->bandwidth_up % 10);
2671         ret = seq_has_overflowed(seq) ? -1 : 0;
2672
2673         if (curr_gw)
2674                 batadv_gw_node_put(curr_gw);
2675 out:
2676         if (router_ifinfo)
2677                 batadv_neigh_ifinfo_put(router_ifinfo);
2678         if (router)
2679                 batadv_neigh_node_put(router);
2680         return ret;
2681 }
2682
2683 static void batadv_iv_gw_print(struct batadv_priv *bat_priv,
2684                                struct seq_file *seq)
2685 {
2686         struct batadv_gw_node *gw_node;
2687         int gw_count = 0;
2688
2689         seq_puts(seq,
2690                  "      Gateway      (#/255)           Nexthop [outgoingIF]: advertised uplink bandwidth\n");
2691
2692         rcu_read_lock();
2693         hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) {
2694                 /* fails if orig_node has no router */
2695                 if (batadv_iv_gw_write_buffer_text(bat_priv, seq, gw_node) < 0)
2696                         continue;
2697
2698                 gw_count++;
2699         }
2700         rcu_read_unlock();
2701
2702         if (gw_count == 0)
2703                 seq_puts(seq, "No gateways in range ...\n");
2704 }
2705 #endif
2706
2707 /**
2708  * batadv_iv_gw_dump_entry - Dump a gateway into a message
2709  * @msg: Netlink message to dump into
2710  * @portid: Port making netlink request
2711  * @seq: Sequence number of netlink message
2712  * @bat_priv: The bat priv with all the soft interface information
2713  * @gw_node: Gateway to be dumped
2714  *
2715  * Return: Error code, or 0 on success
2716  */
2717 static int batadv_iv_gw_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2718                                    struct batadv_priv *bat_priv,
2719                                    struct batadv_gw_node *gw_node)
2720 {
2721         struct batadv_neigh_ifinfo *router_ifinfo = NULL;
2722         struct batadv_neigh_node *router;
2723         struct batadv_gw_node *curr_gw;
2724         int ret = -EINVAL;
2725         void *hdr;
2726
2727         router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
2728         if (!router)
2729                 goto out;
2730
2731         router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
2732         if (!router_ifinfo)
2733                 goto out;
2734
2735         curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
2736
2737         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2738                           NLM_F_MULTI, BATADV_CMD_GET_GATEWAYS);
2739         if (!hdr) {
2740                 ret = -ENOBUFS;
2741                 goto out;
2742         }
2743
2744         ret = -EMSGSIZE;
2745
2746         if (curr_gw == gw_node)
2747                 if (nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) {
2748                         genlmsg_cancel(msg, hdr);
2749                         goto out;
2750                 }
2751
2752         if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2753                     gw_node->orig_node->orig) ||
2754             nla_put_u8(msg, BATADV_ATTR_TQ, router_ifinfo->bat_iv.tq_avg) ||
2755             nla_put(msg, BATADV_ATTR_ROUTER, ETH_ALEN,
2756                     router->addr) ||
2757             nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
2758                            router->if_incoming->net_dev->name) ||
2759             nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN,
2760                         gw_node->bandwidth_down) ||
2761             nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP,
2762                         gw_node->bandwidth_up)) {
2763                 genlmsg_cancel(msg, hdr);
2764                 goto out;
2765         }
2766
2767         genlmsg_end(msg, hdr);
2768         ret = 0;
2769
2770 out:
2771         if (router_ifinfo)
2772                 batadv_neigh_ifinfo_put(router_ifinfo);
2773         if (router)
2774                 batadv_neigh_node_put(router);
2775         return ret;
2776 }
2777
2778 /**
2779  * batadv_iv_gw_dump - Dump gateways into a message
2780  * @msg: Netlink message to dump into
2781  * @cb: Control block containing additional options
2782  * @bat_priv: The bat priv with all the soft interface information
2783  */
2784 static void batadv_iv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb,
2785                               struct batadv_priv *bat_priv)
2786 {
2787         int portid = NETLINK_CB(cb->skb).portid;
2788         struct batadv_gw_node *gw_node;
2789         int idx_skip = cb->args[0];
2790         int idx = 0;
2791
2792         rcu_read_lock();
2793         hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) {
2794                 if (idx++ < idx_skip)
2795                         continue;
2796
2797                 if (batadv_iv_gw_dump_entry(msg, portid, cb->nlh->nlmsg_seq,
2798                                             bat_priv, gw_node)) {
2799                         idx_skip = idx - 1;
2800                         goto unlock;
2801                 }
2802         }
2803
2804         idx_skip = idx;
2805 unlock:
2806         rcu_read_unlock();
2807
2808         cb->args[0] = idx_skip;
2809 }
2810
2811 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
2812         .name = "BATMAN_IV",
2813         .iface = {
2814                 .activate = batadv_iv_iface_activate,
2815                 .enable = batadv_iv_ogm_iface_enable,
2816                 .disable = batadv_iv_ogm_iface_disable,
2817                 .update_mac = batadv_iv_ogm_iface_update_mac,
2818                 .primary_set = batadv_iv_ogm_primary_iface_set,
2819         },
2820         .neigh = {
2821                 .cmp = batadv_iv_ogm_neigh_cmp,
2822                 .is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
2823 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2824                 .print = batadv_iv_neigh_print,
2825 #endif
2826                 .dump = batadv_iv_ogm_neigh_dump,
2827         },
2828         .orig = {
2829 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2830                 .print = batadv_iv_ogm_orig_print,
2831 #endif
2832                 .dump = batadv_iv_ogm_orig_dump,
2833                 .free = batadv_iv_ogm_orig_free,
2834                 .add_if = batadv_iv_ogm_orig_add_if,
2835                 .del_if = batadv_iv_ogm_orig_del_if,
2836         },
2837         .gw = {
2838                 .init_sel_class = batadv_iv_init_sel_class,
2839                 .get_best_gw_node = batadv_iv_gw_get_best_gw_node,
2840                 .is_eligible = batadv_iv_gw_is_eligible,
2841 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2842                 .print = batadv_iv_gw_print,
2843 #endif
2844                 .dump = batadv_iv_gw_dump,
2845         },
2846 };
2847
2848 int __init batadv_iv_init(void)
2849 {
2850         int ret;
2851
2852         /* batman originator packet */
2853         ret = batadv_recv_handler_register(BATADV_IV_OGM,
2854                                            batadv_iv_ogm_receive);
2855         if (ret < 0)
2856                 goto out;
2857
2858         ret = batadv_algo_register(&batadv_batman_iv);
2859         if (ret < 0)
2860                 goto handler_unregister;
2861
2862         goto out;
2863
2864 handler_unregister:
2865         batadv_recv_handler_unregister(BATADV_IV_OGM);
2866 out:
2867         return ret;
2868 }