drivers/staging/batman-adv/routing.c

   1 /*
   2  * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "routing.h"
  24 #include "send.h"
  25 #include "hash.h"
  26 #include "soft-interface.h"
  27 #include "hard-interface.h"
  28 #include "icmp_socket.h"
  29 #include "translation-table.h"
  30 #include "originator.h"
  31 #include "types.h"
  32 #include "ring_buffer.h"
  33 #include "vis.h"
  34 #include "aggregation.h"
  35
  36 static DECLARE_WAIT_QUEUE_HEAD(thread_wait);
  37
  38 void slide_own_bcast_window(struct batman_if *batman_if)
  39 {
  40         HASHIT(hashit);
  41         struct orig_node *orig_node;
  42         TYPE_OF_WORD *word;
  43         unsigned long flags;
  44
  45         spin_lock_irqsave(&orig_hash_lock, flags);
  46
  47         while (hash_iterate(orig_hash, &hashit)) {
  48                 orig_node = hashit.bucket->data;
  49                 word = &(orig_node->bcast_own[batman_if->if_num * NUM_WORDS]);
  50
  51                 bit_get_packet(word, 1, 0);
  52                 orig_node->bcast_own_sum[batman_if->if_num] =
  53                         bit_packet_count(word);
  54         }
  55
  56         spin_unlock_irqrestore(&orig_hash_lock, flags);
  57 }
  58
  59 static void update_HNA(struct orig_node *orig_node,
  60                        unsigned char *hna_buff, int hna_buff_len)
  61 {
  62         if ((hna_buff_len != orig_node->hna_buff_len) ||
  63             ((hna_buff_len > 0) &&
  64              (orig_node->hna_buff_len > 0) &&
  65              (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
  66
  67                 if (orig_node->hna_buff_len > 0)
  68                         hna_global_del_orig(orig_node,
  69                                             "originator changed hna");
  70
  71                 if ((hna_buff_len > 0) && (hna_buff != NULL))
  72                         hna_global_add_orig(orig_node, hna_buff, hna_buff_len);
  73         }
  74 }
  75
  76 static void update_route(struct orig_node *orig_node,
  77                          struct neigh_node *neigh_node,
  78                          unsigned char *hna_buff, int hna_buff_len)
  79 {
  80         /* FIXME: each orig_node->batman_if will be attached to a softif */
  81         struct bat_priv *bat_priv = netdev_priv(soft_device);
  82
  83         /* route deleted */
  84         if ((orig_node->router != NULL) && (neigh_node == NULL)) {
  85
  86                 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
  87                         orig_node->orig);
  88                 hna_global_del_orig(orig_node, "originator timed out");
  89
  90                 /* route added */
  91         } else if ((orig_node->router == NULL) && (neigh_node != NULL)) {
  92
  93                 bat_dbg(DBG_ROUTES, bat_priv,
  94                         "Adding route towards: %pM (via %pM)\n",
  95                         orig_node->orig, neigh_node->addr);
  96                 hna_global_add_orig(orig_node, hna_buff, hna_buff_len);
  97
  98                 /* route changed */
  99         } else {
 100                 bat_dbg(DBG_ROUTES, bat_priv,
 101                         "Changing route towards: %pM "
 102                         "(now via %pM - was via %pM)\n",
 103                         orig_node->orig, neigh_node->addr,
 104                         orig_node->router->addr);
 105         }
 106
 107         orig_node->router = neigh_node;
 108 }
 109
 110
 111 void update_routes(struct orig_node *orig_node,
 112                           struct neigh_node *neigh_node,
 113                           unsigned char *hna_buff, int hna_buff_len)
 114 {
 115
 116         if (orig_node == NULL)
 117                 return;
 118
 119         if (orig_node->router != neigh_node)
 120                 update_route(orig_node, neigh_node, hna_buff, hna_buff_len);
 121         /* may be just HNA changed */
 122         else
 123                 update_HNA(orig_node, hna_buff, hna_buff_len);
 124 }
 125
 126 static int is_bidirectional_neigh(struct orig_node *orig_node,
 127                                 struct orig_node *orig_neigh_node,
 128                                 struct batman_packet *batman_packet,
 129                                 struct batman_if *if_incoming)
 130 {
 131         /* FIXME: each orig_node->batman_if will be attached to a softif */
 132         struct bat_priv *bat_priv = netdev_priv(soft_device);
 133         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 134         unsigned char total_count;
 135
 136         if (orig_node == orig_neigh_node) {
 137                 list_for_each_entry(tmp_neigh_node,
 138                                     &orig_node->neigh_list,
 139                                     list) {
 140
 141                         if (compare_orig(tmp_neigh_node->addr,
 142                                          orig_neigh_node->orig) &&
 143                             (tmp_neigh_node->if_incoming == if_incoming))
 144                                 neigh_node = tmp_neigh_node;
 145                 }
 146
 147                 if (!neigh_node)
 148                         neigh_node = create_neighbor(orig_node,
 149                                                      orig_neigh_node,
 150                                                      orig_neigh_node->orig,
 151                                                      if_incoming);
 152                 /* create_neighbor failed, return 0 */
 153                 if (!neigh_node)
 154                         return 0;
 155
 156                 neigh_node->last_valid = jiffies;
 157         } else {
 158                 /* find packet count of corresponding one hop neighbor */
 159                 list_for_each_entry(tmp_neigh_node,
 160                                     &orig_neigh_node->neigh_list, list) {
 161
 162                         if (compare_orig(tmp_neigh_node->addr,
 163                                          orig_neigh_node->orig) &&
 164                             (tmp_neigh_node->if_incoming == if_incoming))
 165                                 neigh_node = tmp_neigh_node;
 166                 }
 167
 168                 if (!neigh_node)
 169                         neigh_node = create_neighbor(orig_neigh_node,
 170                                                      orig_neigh_node,
 171                                                      orig_neigh_node->orig,
 172                                                      if_incoming);
 173                 /* create_neighbor failed, return 0 */
 174                 if (!neigh_node)
 175                         return 0;
 176         }
 177
 178         orig_node->last_valid = jiffies;
 179
 180         /* pay attention to not get a value bigger than 100 % */
 181         total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
 182                        neigh_node->real_packet_count ?
 183                        neigh_node->real_packet_count :
 184                        orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
 185
 186         /* if we have too few packets (too less data) we set tq_own to zero */
 187         /* if we receive too few packets it is not considered bidirectional */
 188         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 189             (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 190                 orig_neigh_node->tq_own = 0;
 191         else
 192                 /* neigh_node->real_packet_count is never zero as we
 193                  * only purge old information when getting new
 194                  * information */
 195                 orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
 196                         neigh_node->real_packet_count;
 197
 198         /*
 199          * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 200          * affect the nearly-symmetric links only a little, but
 201          * punishes asymmetric links more.  This will give a value
 202          * between 0 and TQ_MAX_VALUE
 203          */
 204         orig_neigh_node->tq_asym_penalty =
 205                 TQ_MAX_VALUE -
 206                 (TQ_MAX_VALUE *
 207                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 208                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 209                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
 210                 (TQ_LOCAL_WINDOW_SIZE *
 211                  TQ_LOCAL_WINDOW_SIZE *
 212                  TQ_LOCAL_WINDOW_SIZE);
 213
 214         batman_packet->tq = ((batman_packet->tq *
 215                               orig_neigh_node->tq_own *
 216                               orig_neigh_node->tq_asym_penalty) /
 217                              (TQ_MAX_VALUE * TQ_MAX_VALUE));
 218
 219         bat_dbg(DBG_BATMAN, bat_priv,
 220                 "bidirectional: "
 221                 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
 222                 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
 223                 "total tq: %3i\n",
 224                 orig_node->orig, orig_neigh_node->orig, total_count,
 225                 neigh_node->real_packet_count, orig_neigh_node->tq_own,
 226                 orig_neigh_node->tq_asym_penalty, batman_packet->tq);
 227
 228         /* if link has the minimum required transmission quality
 229          * consider it bidirectional */
 230         if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 231                 return 1;
 232
 233         return 0;
 234 }
 235
 236 static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr,
 237                         struct batman_packet *batman_packet,
 238                         struct batman_if *if_incoming,
 239                         unsigned char *hna_buff, int hna_buff_len,
 240                         char is_duplicate)
 241 {
 242         /* FIXME: get bat_priv */
 243         struct bat_priv *bat_priv = netdev_priv(soft_device);
 244         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 245         int tmp_hna_buff_len;
 246
 247         bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
 248                 "Searching and updating originator entry of received packet\n");
 249
 250         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 251                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 252                     (tmp_neigh_node->if_incoming == if_incoming)) {
 253                         neigh_node = tmp_neigh_node;
 254                         continue;
 255                 }
 256
 257                 if (is_duplicate)
 258                         continue;
 259
 260                 ring_buffer_set(tmp_neigh_node->tq_recv,
 261                                 &tmp_neigh_node->tq_index, 0);
 262                 tmp_neigh_node->tq_avg =
 263                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 264         }
 265
 266         if (!neigh_node) {
 267                 struct orig_node *orig_tmp;
 268
 269                 orig_tmp = get_orig_node(ethhdr->h_source);
 270                 if (!orig_tmp)
 271                         return;
 272
 273                 neigh_node = create_neighbor(orig_node,
 274                                              orig_tmp,
 275                                              ethhdr->h_source, if_incoming);
 276                 if (!neigh_node)
 277                         return;
 278         } else
 279                 bat_dbg(DBG_BATMAN, bat_priv,
 280                         "Updating existing last-hop neighbor of originator\n");
 281
 282         orig_node->flags = batman_packet->flags;
 283         neigh_node->last_valid = jiffies;
 284
 285         ring_buffer_set(neigh_node->tq_recv,
 286                         &neigh_node->tq_index,
 287                         batman_packet->tq);
 288         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 289
 290         if (!is_duplicate) {
 291                 orig_node->last_ttl = batman_packet->ttl;
 292                 neigh_node->last_ttl = batman_packet->ttl;
 293         }
 294
 295         tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
 296                             batman_packet->num_hna * ETH_ALEN : hna_buff_len);
 297
 298         /* if this neighbor already is our next hop there is nothing
 299          * to change */
 300         if (orig_node->router == neigh_node)
 301                 goto update_hna;
 302
 303         /* if this neighbor does not offer a better TQ we won't consider it */
 304         if ((orig_node->router) &&
 305             (orig_node->router->tq_avg > neigh_node->tq_avg))
 306                 goto update_hna;
 307
 308         /* if the TQ is the same and the link not more symetric we
 309          * won't consider it either */
 310         if ((orig_node->router) &&
 311              ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
 312              (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
 313               >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
 314                 goto update_hna;
 315
 316         update_routes(orig_node, neigh_node, hna_buff, tmp_hna_buff_len);
 317         return;
 318
 319 update_hna:
 320         update_routes(orig_node, orig_node->router, hna_buff, tmp_hna_buff_len);
 321 }
 322
 323 /* checks whether the host restarted and is in the protection time.
 324  * returns:
 325  *  0 if the packet is to be accepted
 326  *  1 if the packet is to be ignored.
 327  */
 328 static int window_protected(int32_t seq_num_diff,
 329                                 unsigned long *last_reset)
 330 {
 331         /* FIXME: each orig_node->batman_if will be attached to a softif */
 332         struct bat_priv *bat_priv = netdev_priv(soft_device);
 333
 334         if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
 335                 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
 336                 if (time_after(jiffies, *last_reset +
 337                         msecs_to_jiffies(RESET_PROTECTION_MS))) {
 338
 339                         *last_reset = jiffies;
 340                         bat_dbg(DBG_BATMAN, bat_priv,
 341                                 "old packet received, start protection\n");
 342
 343                         return 0;
 344                 } else
 345                         return 1;
 346         }
 347         return 0;
 348 }
 349
 350 /* processes a batman packet for all interfaces, adjusts the sequence number and
 351  * finds out whether it is a duplicate.
 352  * returns:
 353  *   1 the packet is a duplicate
 354  *   0 the packet has not yet been received
 355  *  -1 the packet is old and has been received while the seqno window
 356  *     was protected. Caller should drop it.
 357  */
 358 static char count_real_packets(struct ethhdr *ethhdr,
 359                                struct batman_packet *batman_packet,
 360                                struct batman_if *if_incoming)
 361 {
 362         /* FIXME: each orig_node->batman_if will be attached to a softif */
 363         struct bat_priv *bat_priv = netdev_priv(soft_device);
 364         struct orig_node *orig_node;
 365         struct neigh_node *tmp_neigh_node;
 366         char is_duplicate = 0;
 367         int32_t seq_diff;
 368         int need_update = 0;
 369         int set_mark;
 370
 371         orig_node = get_orig_node(batman_packet->orig);
 372         if (orig_node == NULL)
 373                 return 0;
 374
 375         seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
 376
 377         /* signalize caller that the packet is to be dropped. */
 378         if (window_protected(seq_diff, &orig_node->batman_seqno_reset))
 379                 return -1;
 380
 381         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 382
 383                 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
 384                                                orig_node->last_real_seqno,
 385                                                batman_packet->seqno);
 386
 387                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 388                     (tmp_neigh_node->if_incoming == if_incoming))
 389                         set_mark = 1;
 390                 else
 391                         set_mark = 0;
 392
 393                 /* if the window moved, set the update flag. */
 394                 need_update |= bit_get_packet(tmp_neigh_node->real_bits,
 395                                                 seq_diff, set_mark);
 396
 397                 tmp_neigh_node->real_packet_count =
 398                         bit_packet_count(tmp_neigh_node->real_bits);
 399         }
 400
 401         if (need_update) {
 402                 bat_dbg(DBG_BATMAN, bat_priv,
 403                         "updating last_seqno: old %d, new %d\n",
 404                         orig_node->last_real_seqno, batman_packet->seqno);
 405                 orig_node->last_real_seqno = batman_packet->seqno;
 406         }
 407
 408         return is_duplicate;
 409 }
 410
 411 /* copy primary address for bonding */
 412 static void mark_bonding_address(struct bat_priv *bat_priv,
 413                                  struct orig_node *orig_node,
 414                                  struct orig_node *orig_neigh_node,
 415                                  struct batman_packet *batman_packet)
 416
 417 {
 418         if (batman_packet->flags & PRIMARIES_FIRST_HOP)
 419                 memcpy(orig_neigh_node->primary_addr,
 420                        orig_node->orig, ETH_ALEN);
 421
 422         return;
 423 }
 424
 425 /* mark possible bond.candidates in the neighbor list */
 426 void update_bonding_candidates(struct bat_priv *bat_priv,
 427                                struct orig_node *orig_node)
 428 {
 429         int candidates;
 430         int interference_candidate;
 431         int best_tq;
 432         struct neigh_node *tmp_neigh_node, *tmp_neigh_node2;
 433         struct neigh_node *first_candidate, *last_candidate;
 434
 435         /* update the candidates for this originator */
 436         if (!orig_node->router) {
 437                 orig_node->bond.candidates = 0;
 438                 return;
 439         }
 440
 441         best_tq = orig_node->router->tq_avg;
 442
 443         /* update bond.candidates */
 444
 445         candidates = 0;
 446
 447         /* mark other nodes which also received "PRIMARIES FIRST HOP" packets
 448          * as "bonding partner" */
 449
 450         /* first, zero the list */
 451         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 452                 tmp_neigh_node->next_bond_candidate = NULL;
 453         }
 454
 455         first_candidate = NULL;
 456         last_candidate = NULL;
 457         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 458
 459                 /* only consider if it has the same primary address ...  */
 460                 if (memcmp(orig_node->orig,
 461                                 tmp_neigh_node->orig_node->primary_addr,
 462                                 ETH_ALEN) != 0)
 463                         continue;
 464
 465                 /* ... and is good enough to be considered */
 466                 if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
 467                         continue;
 468
 469                 /* check if we have another candidate with the same
 470                  * mac address or interface. If we do, we won't
 471                  * select this candidate because of possible interference. */
 472
 473                 interference_candidate = 0;
 474                 list_for_each_entry(tmp_neigh_node2,
 475                                 &orig_node->neigh_list, list) {
 476
 477                         if (tmp_neigh_node2 == tmp_neigh_node)
 478                                 continue;
 479
 480                         /* we only care if the other candidate is even
 481                          * considered as candidate. */
 482                         if (tmp_neigh_node2->next_bond_candidate == NULL)
 483                                 continue;
 484
 485
 486                         if ((tmp_neigh_node->if_incoming ==
 487                                 tmp_neigh_node2->if_incoming)
 488                                 || (memcmp(tmp_neigh_node->addr,
 489                                 tmp_neigh_node2->addr, ETH_ALEN) == 0)) {
 490
 491                                 interference_candidate = 1;
 492                                 break;
 493                         }
 494                 }
 495                 /* don't care further if it is an interference candidate */
 496                 if (interference_candidate)
 497                         continue;
 498
 499                 if (first_candidate == NULL) {
 500                         first_candidate = tmp_neigh_node;
 501                         tmp_neigh_node->next_bond_candidate = first_candidate;
 502                 } else
 503                         tmp_neigh_node->next_bond_candidate = last_candidate;
 504
 505                 last_candidate = tmp_neigh_node;
 506
 507                 candidates++;
 508         }
 509
 510         if (candidates > 0) {
 511                 first_candidate->next_bond_candidate = last_candidate;
 512                 orig_node->bond.selected = first_candidate;
 513         }
 514
 515         orig_node->bond.candidates = candidates;
 516 }
 517
 518 void receive_bat_packet(struct ethhdr *ethhdr,
 519                                 struct batman_packet *batman_packet,
 520                                 unsigned char *hna_buff, int hna_buff_len,
 521                                 struct batman_if *if_incoming)
 522 {
 523         /* FIXME: each orig_node->batman_if will be attached to a softif */
 524         struct bat_priv *bat_priv = netdev_priv(soft_device);
 525         struct batman_if *batman_if;
 526         struct orig_node *orig_neigh_node, *orig_node;
 527         char has_directlink_flag;
 528         char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 529         char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 530         char is_duplicate;
 531         uint32_t if_incoming_seqno;
 532
 533         /* Silently drop when the batman packet is actually not a
 534          * correct packet.
 535          *
 536          * This might happen if a packet is padded (e.g. Ethernet has a
 537          * minimum frame length of 64 byte) and the aggregation interprets
 538          * it as an additional length.
 539          *
 540          * TODO: A more sane solution would be to have a bit in the
 541          * batman_packet to detect whether the packet is the last
 542          * packet in an aggregation.  Here we expect that the padding
 543          * is always zero (or not 0x01)
 544          */
 545         if (batman_packet->packet_type != BAT_PACKET)
 546                 return;
 547
 548         /* could be changed by schedule_own_packet() */
 549         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 550
 551         has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
 552
 553         is_single_hop_neigh = (compare_orig(ethhdr->h_source,
 554                                             batman_packet->orig) ? 1 : 0);
 555
 556         bat_dbg(DBG_BATMAN, bat_priv,
 557                 "Received BATMAN packet via NB: %pM, IF: %s [%s] "
 558                 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
 559                 "TTL %d, V %d, IDF %d)\n",
 560                 ethhdr->h_source, if_incoming->dev, if_incoming->addr_str,
 561                 batman_packet->orig, batman_packet->prev_sender,
 562                 batman_packet->seqno, batman_packet->tq, batman_packet->ttl,
 563                 batman_packet->version, has_directlink_flag);
 564
 565         list_for_each_entry_rcu(batman_if, &if_list, list) {
 566                 if (batman_if->if_status != IF_ACTIVE)
 567                         continue;
 568
 569                 if (compare_orig(ethhdr->h_source,
 570                                  batman_if->net_dev->dev_addr))
 571                         is_my_addr = 1;
 572
 573                 if (compare_orig(batman_packet->orig,
 574                                  batman_if->net_dev->dev_addr))
 575                         is_my_orig = 1;
 576
 577                 if (compare_orig(batman_packet->prev_sender,
 578                                  batman_if->net_dev->dev_addr))
 579                         is_my_oldorig = 1;
 580
 581                 if (compare_orig(ethhdr->h_source, broadcast_addr))
 582                         is_broadcast = 1;
 583         }
 584
 585         if (batman_packet->version != COMPAT_VERSION) {
 586                 bat_dbg(DBG_BATMAN, bat_priv,
 587                         "Drop packet: incompatible batman version (%i)\n",
 588                         batman_packet->version);
 589                 return;
 590         }
 591
 592         if (is_my_addr) {
 593                 bat_dbg(DBG_BATMAN, bat_priv,
 594                         "Drop packet: received my own broadcast (sender: %pM"
 595                         ")\n",
 596                         ethhdr->h_source);
 597                 return;
 598         }
 599
 600         if (is_broadcast) {
 601                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 602                 "ignoring all packets with broadcast source addr (sender: %pM"
 603                 ")\n", ethhdr->h_source);
 604                 return;
 605         }
 606
 607         if (is_my_orig) {
 608                 TYPE_OF_WORD *word;
 609                 int offset;
 610
 611                 orig_neigh_node = get_orig_node(ethhdr->h_source);
 612
 613                 if (!orig_neigh_node)
 614                         return;
 615
 616                 /* neighbor has to indicate direct link and it has to
 617                  * come via the corresponding interface */
 618                 /* if received seqno equals last send seqno save new
 619                  * seqno for bidirectional check */
 620                 if (has_directlink_flag &&
 621                     compare_orig(if_incoming->net_dev->dev_addr,
 622                                  batman_packet->orig) &&
 623                     (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
 624                         offset = if_incoming->if_num * NUM_WORDS;
 625                         word = &(orig_neigh_node->bcast_own[offset]);
 626                         bit_mark(word, 0);
 627                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
 628                                 bit_packet_count(word);
 629                 }
 630
 631                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 632                         "originator packet from myself (via neighbor)\n");
 633                 return;
 634         }
 635
 636         if (is_my_oldorig) {
 637                 bat_dbg(DBG_BATMAN, bat_priv,
 638                         "Drop packet: ignoring all rebroadcast echos (sender: "
 639                         "%pM)\n", ethhdr->h_source);
 640                 return;
 641         }
 642
 643         orig_node = get_orig_node(batman_packet->orig);
 644         if (orig_node == NULL)
 645                 return;
 646
 647         is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
 648
 649         if (is_duplicate == -1) {
 650                 bat_dbg(DBG_BATMAN, bat_priv,
 651                         "Drop packet: packet within seqno protection time "
 652                         "(sender: %pM)\n", ethhdr->h_source);
 653                 return;
 654         }
 655
 656         if (batman_packet->tq == 0) {
 657                 bat_dbg(DBG_BATMAN, bat_priv,
 658                         "Drop packet: originator packet with tq equal 0\n");
 659                 return;
 660         }
 661
 662         /* avoid temporary routing loops */
 663         if ((orig_node->router) &&
 664             (orig_node->router->orig_node->router) &&
 665             (compare_orig(orig_node->router->addr,
 666                           batman_packet->prev_sender)) &&
 667             !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
 668             (compare_orig(orig_node->router->addr,
 669                           orig_node->router->orig_node->router->addr))) {
 670                 bat_dbg(DBG_BATMAN, bat_priv,
 671                         "Drop packet: ignoring all rebroadcast packets that "
 672                         "may make me loop (sender: %pM)\n", ethhdr->h_source);
 673                 return;
 674         }
 675
 676         /* if sender is a direct neighbor the sender mac equals
 677          * originator mac */
 678         orig_neigh_node = (is_single_hop_neigh ?
 679                            orig_node : get_orig_node(ethhdr->h_source));
 680         if (orig_neigh_node == NULL)
 681                 return;
 682
 683         /* drop packet if sender is not a direct neighbor and if we
 684          * don't route towards it */
 685         if (!is_single_hop_neigh &&
 686             (orig_neigh_node->router == NULL)) {
 687                 bat_dbg(DBG_BATMAN, bat_priv,
 688                         "Drop packet: OGM via unknown neighbor!\n");
 689                 return;
 690         }
 691
 692         is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
 693                                                 batman_packet, if_incoming);
 694
 695         /* update ranking if it is not a duplicate or has the same
 696          * seqno and similar ttl as the non-duplicate */
 697         if (is_bidirectional &&
 698             (!is_duplicate ||
 699              ((orig_node->last_real_seqno == batman_packet->seqno) &&
 700               (orig_node->last_ttl - 3 <= batman_packet->ttl))))
 701                 update_orig(orig_node, ethhdr, batman_packet,
 702                             if_incoming, hna_buff, hna_buff_len, is_duplicate);
 703
 704         mark_bonding_address(bat_priv, orig_node,
 705                              orig_neigh_node, batman_packet);
 706         update_bonding_candidates(bat_priv, orig_node);
 707
 708         /* is single hop (direct) neighbor */
 709         if (is_single_hop_neigh) {
 710
 711                 /* mark direct link on incoming interface */
 712                 schedule_forward_packet(orig_node, ethhdr, batman_packet,
 713                                         1, hna_buff_len, if_incoming);
 714
 715                 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
 716                         "rebroadcast neighbor packet with direct link flag\n");
 717                 return;
 718         }
 719
 720         /* multihop originator */
 721         if (!is_bidirectional) {
 722                 bat_dbg(DBG_BATMAN, bat_priv,
 723                         "Drop packet: not received via bidirectional link\n");
 724                 return;
 725         }
 726
 727         if (is_duplicate) {
 728                 bat_dbg(DBG_BATMAN, bat_priv,
 729                         "Drop packet: duplicate packet received\n");
 730                 return;
 731         }
 732
 733         bat_dbg(DBG_BATMAN, bat_priv,
 734                 "Forwarding packet: rebroadcast originator packet\n");
 735         schedule_forward_packet(orig_node, ethhdr, batman_packet,
 736                                 0, hna_buff_len, if_incoming);
 737 }
 738
 739 int recv_bat_packet(struct sk_buff *skb,
 740                                 struct batman_if *batman_if)
 741 {
 742         struct ethhdr *ethhdr;
 743         unsigned long flags;
 744         struct sk_buff *skb_old;
 745
 746         /* drop packet if it has not necessary minimum size */
 747         if (skb_headlen(skb) < sizeof(struct batman_packet))
 748                 return NET_RX_DROP;
 749
 750         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 751
 752         /* packet with broadcast indication but unicast recipient */
 753         if (!is_bcast(ethhdr->h_dest))
 754                 return NET_RX_DROP;
 755
 756         /* packet with broadcast sender address */
 757         if (is_bcast(ethhdr->h_source))
 758                 return NET_RX_DROP;
 759
 760         /* TODO: we use headlen instead of "length", because
 761          * only this data is paged in. */
 762
 763         /* create a copy of the skb, if needed, to modify it. */
 764         if (!skb_clone_writable(skb, skb_headlen(skb))) {
 765                 skb_old = skb;
 766                 skb = skb_copy(skb, GFP_ATOMIC);
 767                 if (!skb)
 768                         return NET_RX_DROP;
 769                 ethhdr = (struct ethhdr *)skb_mac_header(skb);
 770                 kfree_skb(skb_old);
 771         }
 772
 773         spin_lock_irqsave(&orig_hash_lock, flags);
 774         receive_aggr_bat_packet(ethhdr,
 775                                 skb->data,
 776                                 skb_headlen(skb),
 777                                 batman_if);
 778         spin_unlock_irqrestore(&orig_hash_lock, flags);
 779
 780         kfree_skb(skb);
 781         return NET_RX_SUCCESS;
 782 }
 783
 784 static int recv_my_icmp_packet(struct sk_buff *skb, size_t icmp_len)
 785 {
 786         struct orig_node *orig_node;
 787         struct icmp_packet_rr *icmp_packet;
 788         struct ethhdr *ethhdr;
 789         struct sk_buff *skb_old;
 790         struct batman_if *batman_if;
 791         int ret;
 792         unsigned long flags;
 793         uint8_t dstaddr[ETH_ALEN];
 794
 795         icmp_packet = (struct icmp_packet_rr *)skb->data;
 796         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 797
 798         /* add data to device queue */
 799         if (icmp_packet->msg_type != ECHO_REQUEST) {
 800                 bat_socket_receive_packet(icmp_packet, icmp_len);
 801                 return NET_RX_DROP;
 802         }
 803
 804         /* answer echo request (ping) */
 805         /* get routing information */
 806         spin_lock_irqsave(&orig_hash_lock, flags);
 807         orig_node = ((struct orig_node *)hash_find(orig_hash,
 808                                                    icmp_packet->orig));
 809         ret = NET_RX_DROP;
 810
 811         if ((orig_node != NULL) &&
 812             (orig_node->router != NULL)) {
 813
 814                 /* don't lock while sending the packets ... we therefore
 815                  * copy the required data before sending */
 816                 batman_if = orig_node->router->if_incoming;
 817                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 818                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 819
 820                 /* create a copy of the skb, if needed, to modify it. */
 821                 skb_old = NULL;
 822                 if (!skb_clone_writable(skb, icmp_len)) {
 823                         skb_old = skb;
 824                         skb = skb_copy(skb, GFP_ATOMIC);
 825                         if (!skb)
 826                                 return NET_RX_DROP;
 827                         icmp_packet = (struct icmp_packet_rr *)skb->data;
 828                         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 829                         kfree_skb(skb_old);
 830                 }
 831
 832                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 833                 memcpy(icmp_packet->orig, ethhdr->h_dest, ETH_ALEN);
 834                 icmp_packet->msg_type = ECHO_REPLY;
 835                 icmp_packet->ttl = TTL;
 836
 837                 send_skb_packet(skb, batman_if, dstaddr);
 838                 ret = NET_RX_SUCCESS;
 839
 840         } else
 841                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 842
 843         return ret;
 844 }
 845
 846 static int recv_icmp_ttl_exceeded(struct sk_buff *skb, size_t icmp_len)
 847 {
 848         struct orig_node *orig_node;
 849         struct icmp_packet *icmp_packet;
 850         struct ethhdr *ethhdr;
 851         struct sk_buff *skb_old;
 852         struct batman_if *batman_if;
 853         int ret;
 854         unsigned long flags;
 855         uint8_t dstaddr[ETH_ALEN];
 856
 857         icmp_packet = (struct icmp_packet *)skb->data;
 858         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 859
 860         /* send TTL exceeded if packet is an echo request (traceroute) */
 861         if (icmp_packet->msg_type != ECHO_REQUEST) {
 862                 pr_warning("Warning - can't forward icmp packet from %pM to "
 863                            "%pM: ttl exceeded\n", icmp_packet->orig,
 864                            icmp_packet->dst);
 865                 return NET_RX_DROP;
 866         }
 867
 868         /* get routing information */
 869         spin_lock_irqsave(&orig_hash_lock, flags);
 870         orig_node = ((struct orig_node *)
 871                      hash_find(orig_hash, icmp_packet->orig));
 872         ret = NET_RX_DROP;
 873
 874         if ((orig_node != NULL) &&
 875             (orig_node->router != NULL)) {
 876
 877                 /* don't lock while sending the packets ... we therefore
 878                  * copy the required data before sending */
 879                 batman_if = orig_node->router->if_incoming;
 880                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 881                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 882
 883                 /* create a copy of the skb, if needed, to modify it. */
 884                 if (!skb_clone_writable(skb, icmp_len)) {
 885                         skb_old = skb;
 886                         skb = skb_copy(skb, GFP_ATOMIC);
 887                         if (!skb)
 888                                 return NET_RX_DROP;
 889                         icmp_packet = (struct icmp_packet *) skb->data;
 890                         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 891                         kfree_skb(skb_old);
 892                 }
 893
 894                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 895                 memcpy(icmp_packet->orig, ethhdr->h_dest, ETH_ALEN);
 896                 icmp_packet->msg_type = TTL_EXCEEDED;
 897                 icmp_packet->ttl = TTL;
 898
 899                 send_skb_packet(skb, batman_if, dstaddr);
 900                 ret = NET_RX_SUCCESS;
 901
 902         } else
 903                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 904
 905         return ret;
 906 }
 907
 908
 909 int recv_icmp_packet(struct sk_buff *skb)
 910 {
 911         struct icmp_packet_rr *icmp_packet;
 912         struct ethhdr *ethhdr;
 913         struct orig_node *orig_node;
 914         struct sk_buff *skb_old;
 915         struct batman_if *batman_if;
 916         int hdr_size = sizeof(struct icmp_packet);
 917         int ret;
 918         unsigned long flags;
 919         uint8_t dstaddr[ETH_ALEN];
 920
 921         /**
 922          * we truncate all incoming icmp packets if they don't match our size
 923          */
 924         if (skb_headlen(skb) >= sizeof(struct icmp_packet_rr))
 925                 hdr_size = sizeof(struct icmp_packet_rr);
 926
 927         /* drop packet if it has not necessary minimum size */
 928         if (skb_headlen(skb) < hdr_size)
 929                 return NET_RX_DROP;
 930
 931         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 932
 933         /* packet with unicast indication but broadcast recipient */
 934         if (is_bcast(ethhdr->h_dest))
 935                 return NET_RX_DROP;
 936
 937         /* packet with broadcast sender address */
 938         if (is_bcast(ethhdr->h_source))
 939                 return NET_RX_DROP;
 940
 941         /* not for me */
 942         if (!is_my_mac(ethhdr->h_dest))
 943                 return NET_RX_DROP;
 944
 945         icmp_packet = (struct icmp_packet_rr *)skb->data;
 946
 947         /* add record route information if not full */
 948         if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
 949             (icmp_packet->rr_cur < BAT_RR_LEN)) {
 950                 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
 951                         ethhdr->h_dest, ETH_ALEN);
 952                 icmp_packet->rr_cur++;
 953         }
 954
 955         /* packet for me */
 956         if (is_my_mac(icmp_packet->dst))
 957                 return recv_my_icmp_packet(skb, hdr_size);
 958
 959         /* TTL exceeded */
 960         if (icmp_packet->ttl < 2)
 961                 return recv_icmp_ttl_exceeded(skb, hdr_size);
 962
 963         ret = NET_RX_DROP;
 964
 965         /* get routing information */
 966         spin_lock_irqsave(&orig_hash_lock, flags);
 967         orig_node = ((struct orig_node *)
 968                      hash_find(orig_hash, icmp_packet->dst));
 969
 970         if ((orig_node != NULL) &&
 971             (orig_node->router != NULL)) {
 972
 973                 /* don't lock while sending the packets ... we therefore
 974                  * copy the required data before sending */
 975                 batman_if = orig_node->router->if_incoming;
 976                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 977                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 978
 979                 /* create a copy of the skb, if needed, to modify it. */
 980                 if (!skb_clone_writable(skb, hdr_size)) {
 981                         skb_old = skb;
 982                         skb = skb_copy(skb, GFP_ATOMIC);
 983                         if (!skb)
 984                                 return NET_RX_DROP;
 985                         icmp_packet = (struct icmp_packet_rr *)skb->data;
 986                         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 987                         kfree_skb(skb_old);
 988                 }
 989
 990                 /* decrement ttl */
 991                 icmp_packet->ttl--;
 992
 993                 /* route it */
 994                 send_skb_packet(skb, batman_if, dstaddr);
 995                 ret = NET_RX_SUCCESS;
 996
 997         } else
 998                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 999
1000         return ret;
1001 }
1002
1003 /* find a suitable router for this originator, and use
1004  * bonding if possible. */
1005 struct neigh_node *find_router(struct orig_node *orig_node,
1006                 struct batman_if *recv_if)
1007 {
1008         /* FIXME: each orig_node->batman_if will be attached to a softif */
1009         struct bat_priv *bat_priv = netdev_priv(soft_device);
1010         struct orig_node *primary_orig_node;
1011         struct orig_node *router_orig;
1012         struct neigh_node *router, *first_candidate, *best_router;
1013         static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1014         int bonding_enabled;
1015
1016         if (!orig_node)
1017                 return NULL;
1018
1019         if (!orig_node->router)
1020                 return NULL;
1021
1022         /* without bonding, the first node should
1023          * always choose the default router. */
1024
1025         bonding_enabled = atomic_read(&bat_priv->bonding_enabled);
1026         if (!bonding_enabled && (recv_if == NULL))
1027                         return orig_node->router;
1028
1029         router_orig = orig_node->router->orig_node;
1030
1031         /* if we have something in the primary_addr, we can search
1032          * for a potential bonding candidate. */
1033         if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
1034                 return orig_node->router;
1035
1036         /* find the orig_node which has the primary interface. might
1037          * even be the same as our router_orig in many cases */
1038
1039         if (memcmp(router_orig->primary_addr,
1040                                 router_orig->orig, ETH_ALEN) == 0) {
1041                 primary_orig_node = router_orig;
1042         } else {
1043                 primary_orig_node = hash_find(orig_hash,
1044                                                 router_orig->primary_addr);
1045                 if (!primary_orig_node)
1046                         return orig_node->router;
1047         }
1048
1049         /* with less than 2 candidates, we can't do any
1050          * bonding and prefer the original router. */
1051
1052         if (primary_orig_node->bond.candidates < 2)
1053                 return orig_node->router;
1054
1055
1056         /* all nodes between should choose a candidate which
1057          * is is not on the interface where the packet came
1058          * in. */
1059         first_candidate = primary_orig_node->bond.selected;
1060         router = first_candidate;
1061
1062         if (bonding_enabled) {
1063                 /* in the bonding case, send the packets in a round
1064                  * robin fashion over the remaining interfaces. */
1065                 do {
1066                         /* recv_if == NULL on the first node. */
1067                         if (router->if_incoming != recv_if)
1068                                 break;
1069
1070                         router = router->next_bond_candidate;
1071                 } while (router != first_candidate);
1072
1073                 primary_orig_node->bond.selected = router->next_bond_candidate;
1074
1075         } else {
1076                 /* if bonding is disabled, use the best of the
1077                  * remaining candidates which are not using
1078                  * this interface. */
1079                 best_router = first_candidate;
1080
1081                 do {
1082                         /* recv_if == NULL on the first node. */
1083                         if ((router->if_incoming != recv_if) &&
1084                                 (router->tq_avg > best_router->tq_avg))
1085                                         best_router = router;
1086
1087                         router = router->next_bond_candidate;
1088                 } while (router != first_candidate);
1089
1090                 router = best_router;
1091         }
1092
1093         return router;
1094 }
1095
1096 int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1097 {
1098         struct unicast_packet *unicast_packet;
1099         struct orig_node *orig_node;
1100         struct neigh_node *router;
1101         struct ethhdr *ethhdr;
1102         struct batman_if *batman_if;
1103         struct sk_buff *skb_old;
1104         uint8_t dstaddr[ETH_ALEN];
1105         int hdr_size = sizeof(struct unicast_packet);
1106         unsigned long flags;
1107
1108         /* drop packet if it has not necessary minimum size */
1109         if (skb_headlen(skb) < hdr_size)
1110                 return NET_RX_DROP;
1111
1112         ethhdr = (struct ethhdr *) skb_mac_header(skb);
1113
1114         /* packet with unicast indication but broadcast recipient */
1115         if (is_bcast(ethhdr->h_dest))
1116                 return NET_RX_DROP;
1117
1118         /* packet with broadcast sender address */
1119         if (is_bcast(ethhdr->h_source))
1120                 return NET_RX_DROP;
1121
1122         /* not for me */
1123         if (!is_my_mac(ethhdr->h_dest))
1124                 return NET_RX_DROP;
1125
1126         unicast_packet = (struct unicast_packet *) skb->data;
1127
1128         /* packet for me */
1129         if (is_my_mac(unicast_packet->dest)) {
1130                 interface_rx(skb, hdr_size);
1131                 return NET_RX_SUCCESS;
1132         }
1133
1134         /* TTL exceeded */
1135         if (unicast_packet->ttl < 2) {
1136                 pr_warning("Warning - can't forward unicast packet from %pM to "
1137                            "%pM: ttl exceeded\n", ethhdr->h_source,
1138                            unicast_packet->dest);
1139                 return NET_RX_DROP;
1140         }
1141
1142         /* get routing information */
1143         spin_lock_irqsave(&orig_hash_lock, flags);
1144         orig_node = ((struct orig_node *)
1145                      hash_find(orig_hash, unicast_packet->dest));
1146
1147         router = find_router(orig_node, recv_if);
1148
1149         if (!router) {
1150                 spin_unlock_irqrestore(&orig_hash_lock, flags);
1151                 return NET_RX_DROP;
1152         }
1153
1154         /* don't lock while sending the packets ... we therefore
1155          * copy the required data before sending */
1156
1157         batman_if = router->if_incoming;
1158         memcpy(dstaddr, router->addr, ETH_ALEN);
1159
1160         spin_unlock_irqrestore(&orig_hash_lock, flags);
1161
1162         /* create a copy of the skb, if needed, to modify it. */
1163         if (!skb_clone_writable(skb, sizeof(struct unicast_packet))) {
1164                 skb_old = skb;
1165                 skb = skb_copy(skb, GFP_ATOMIC);
1166                 if (!skb)
1167                         return NET_RX_DROP;
1168                 unicast_packet = (struct unicast_packet *) skb->data;
1169                 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1170                 kfree_skb(skb_old);
1171         }
1172
1173         /* decrement ttl */
1174         unicast_packet->ttl--;
1175
1176         /* route it */
1177         send_skb_packet(skb, batman_if, dstaddr);
1178
1179         return NET_RX_SUCCESS;
1180 }
1181
1182 int recv_bcast_packet(struct sk_buff *skb)
1183 {
1184         struct orig_node *orig_node;
1185         struct bcast_packet *bcast_packet;
1186         struct ethhdr *ethhdr;
1187         int hdr_size = sizeof(struct bcast_packet);
1188         int32_t seq_diff;
1189         unsigned long flags;
1190
1191         /* drop packet if it has not necessary minimum size */
1192         if (skb_headlen(skb) < hdr_size)
1193                 return NET_RX_DROP;
1194
1195         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1196
1197         /* packet with broadcast indication but unicast recipient */
1198         if (!is_bcast(ethhdr->h_dest))
1199                 return NET_RX_DROP;
1200
1201         /* packet with broadcast sender address */
1202         if (is_bcast(ethhdr->h_source))
1203                 return NET_RX_DROP;
1204
1205         /* ignore broadcasts sent by myself */
1206         if (is_my_mac(ethhdr->h_source))
1207                 return NET_RX_DROP;
1208
1209         bcast_packet = (struct bcast_packet *)skb->data;
1210
1211         /* ignore broadcasts originated by myself */
1212         if (is_my_mac(bcast_packet->orig))
1213                 return NET_RX_DROP;
1214
1215         if (bcast_packet->ttl < 2)
1216                 return NET_RX_DROP;
1217
1218         spin_lock_irqsave(&orig_hash_lock, flags);
1219         orig_node = ((struct orig_node *)
1220                      hash_find(orig_hash, bcast_packet->orig));
1221
1222         if (orig_node == NULL) {
1223                 spin_unlock_irqrestore(&orig_hash_lock, flags);
1224                 return NET_RX_DROP;
1225         }
1226
1227         /* check whether the packet is a duplicate */
1228         if (get_bit_status(orig_node->bcast_bits,
1229                            orig_node->last_bcast_seqno,
1230                            ntohl(bcast_packet->seqno))) {
1231                 spin_unlock_irqrestore(&orig_hash_lock, flags);
1232                 return NET_RX_DROP;
1233         }
1234
1235         seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1236
1237         /* check whether the packet is old and the host just restarted. */
1238         if (window_protected(seq_diff, &orig_node->bcast_seqno_reset)) {
1239                 spin_unlock_irqrestore(&orig_hash_lock, flags);
1240                 return NET_RX_DROP;
1241         }
1242
1243         /* mark broadcast in flood history, update window position
1244          * if required. */
1245         if (bit_get_packet(orig_node->bcast_bits, seq_diff, 1))
1246                 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1247
1248         spin_unlock_irqrestore(&orig_hash_lock, flags);
1249         /* rebroadcast packet */
1250         add_bcast_packet_to_list(skb);
1251
1252         /* broadcast for me */
1253         interface_rx(skb, hdr_size);
1254
1255         return NET_RX_SUCCESS;
1256 }
1257
1258 int recv_vis_packet(struct sk_buff *skb)
1259 {
1260         struct vis_packet *vis_packet;
1261         struct ethhdr *ethhdr;
1262         struct bat_priv *bat_priv;
1263         int hdr_size = sizeof(struct vis_packet);
1264
1265         if (skb_headlen(skb) < hdr_size)
1266                 return NET_RX_DROP;
1267
1268         vis_packet = (struct vis_packet *) skb->data;
1269         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1270
1271         /* not for me */
1272         if (!is_my_mac(ethhdr->h_dest))
1273                 return NET_RX_DROP;
1274
1275         /* ignore own packets */
1276         if (is_my_mac(vis_packet->vis_orig))
1277                 return NET_RX_DROP;
1278
1279         if (is_my_mac(vis_packet->sender_orig))
1280                 return NET_RX_DROP;
1281
1282         /* FIXME: each batman_if will be attached to a softif */
1283         bat_priv = netdev_priv(soft_device);
1284
1285         switch (vis_packet->vis_type) {
1286         case VIS_TYPE_SERVER_SYNC:
1287                 /* TODO: handle fragmented skbs properly */
1288                 receive_server_sync_packet(bat_priv, vis_packet,
1289                                            skb_headlen(skb));
1290                 break;
1291
1292         case VIS_TYPE_CLIENT_UPDATE:
1293                 /* TODO: handle fragmented skbs properly */
1294                 receive_client_update_packet(bat_priv, vis_packet,
1295                                              skb_headlen(skb));
1296                 break;
1297
1298         default:        /* ignore unknown packet */
1299                 break;
1300         }
1301
1302         /* We take a copy of the data in the packet, so we should
1303            always free the skbuf. */
1304         return NET_RX_DROP;
1305 }