net/batman-adv/routing.c

   1 /*
   2  * Copyright (C) 2007-2011 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 "ring_buffer.h"
  32 #include "vis.h"
  33 #include "aggregation.h"
  34 #include "gateway_common.h"
  35 #include "gateway_client.h"
  36 #include "unicast.h"
  37
  38 void slide_own_bcast_window(struct batman_if *batman_if)
  39 {
  40         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
  41         struct hashtable_t *hash = bat_priv->orig_hash;
  42         struct hlist_node *walk;
  43         struct hlist_head *head;
  44         struct element_t *bucket;
  45         struct orig_node *orig_node;
  46         unsigned long *word;
  47         int i;
  48         size_t word_index;
  49
  50         spin_lock_bh(&bat_priv->orig_hash_lock);
  51
  52         for (i = 0; i < hash->size; i++) {
  53                 head = &hash->table[i];
  54
  55                 hlist_for_each_entry(bucket, walk, head, hlist) {
  56                         orig_node = bucket->data;
  57                         word_index = batman_if->if_num * NUM_WORDS;
  58                         word = &(orig_node->bcast_own[word_index]);
  59
  60                         bit_get_packet(bat_priv, word, 1, 0);
  61                         orig_node->bcast_own_sum[batman_if->if_num] =
  62                                 bit_packet_count(word);
  63                 }
  64         }
  65
  66         spin_unlock_bh(&bat_priv->orig_hash_lock);
  67 }
  68
  69 static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node,
  70                        unsigned char *hna_buff, int hna_buff_len)
  71 {
  72         if ((hna_buff_len != orig_node->hna_buff_len) ||
  73             ((hna_buff_len > 0) &&
  74              (orig_node->hna_buff_len > 0) &&
  75              (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
  76
  77                 if (orig_node->hna_buff_len > 0)
  78                         hna_global_del_orig(bat_priv, orig_node,
  79                                             "originator changed hna");
  80
  81                 if ((hna_buff_len > 0) && (hna_buff))
  82                         hna_global_add_orig(bat_priv, orig_node,
  83                                             hna_buff, hna_buff_len);
  84         }
  85 }
  86
  87 static void update_route(struct bat_priv *bat_priv,
  88                          struct orig_node *orig_node,
  89                          struct neigh_node *neigh_node,
  90                          unsigned char *hna_buff, int hna_buff_len)
  91 {
  92         /* route deleted */
  93         if ((orig_node->router) && (!neigh_node)) {
  94
  95                 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
  96                         orig_node->orig);
  97                 hna_global_del_orig(bat_priv, orig_node,
  98                                     "originator timed out");
  99
 100                 /* route added */
 101         } else if ((!orig_node->router) && (neigh_node)) {
 102
 103                 bat_dbg(DBG_ROUTES, bat_priv,
 104                         "Adding route towards: %pM (via %pM)\n",
 105                         orig_node->orig, neigh_node->addr);
 106                 hna_global_add_orig(bat_priv, orig_node,
 107                                     hna_buff, hna_buff_len);
 108
 109                 /* route changed */
 110         } else {
 111                 bat_dbg(DBG_ROUTES, bat_priv,
 112                         "Changing route towards: %pM "
 113                         "(now via %pM - was via %pM)\n",
 114                         orig_node->orig, neigh_node->addr,
 115                         orig_node->router->addr);
 116         }
 117
 118         orig_node->router = neigh_node;
 119 }
 120
 121
 122 void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
 123                    struct neigh_node *neigh_node, unsigned char *hna_buff,
 124                    int hna_buff_len)
 125 {
 126
 127         if (!orig_node)
 128                 return;
 129
 130         if (orig_node->router != neigh_node)
 131                 update_route(bat_priv, orig_node, neigh_node,
 132                              hna_buff, hna_buff_len);
 133         /* may be just HNA changed */
 134         else
 135                 update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
 136 }
 137
 138 static int is_bidirectional_neigh(struct orig_node *orig_node,
 139                                 struct orig_node *orig_neigh_node,
 140                                 struct batman_packet *batman_packet,
 141                                 struct batman_if *if_incoming)
 142 {
 143         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 144         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 145         unsigned char total_count;
 146
 147         if (orig_node == orig_neigh_node) {
 148                 list_for_each_entry(tmp_neigh_node,
 149                                     &orig_node->neigh_list,
 150                                     list) {
 151
 152                         if (compare_orig(tmp_neigh_node->addr,
 153                                          orig_neigh_node->orig) &&
 154                             (tmp_neigh_node->if_incoming == if_incoming))
 155                                 neigh_node = tmp_neigh_node;
 156                 }
 157
 158                 if (!neigh_node)
 159                         neigh_node = create_neighbor(orig_node,
 160                                                      orig_neigh_node,
 161                                                      orig_neigh_node->orig,
 162                                                      if_incoming);
 163                 /* create_neighbor failed, return 0 */
 164                 if (!neigh_node)
 165                         return 0;
 166
 167                 neigh_node->last_valid = jiffies;
 168         } else {
 169                 /* find packet count of corresponding one hop neighbor */
 170                 list_for_each_entry(tmp_neigh_node,
 171                                     &orig_neigh_node->neigh_list, list) {
 172
 173                         if (compare_orig(tmp_neigh_node->addr,
 174                                          orig_neigh_node->orig) &&
 175                             (tmp_neigh_node->if_incoming == if_incoming))
 176                                 neigh_node = tmp_neigh_node;
 177                 }
 178
 179                 if (!neigh_node)
 180                         neigh_node = create_neighbor(orig_neigh_node,
 181                                                      orig_neigh_node,
 182                                                      orig_neigh_node->orig,
 183                                                      if_incoming);
 184                 /* create_neighbor failed, return 0 */
 185                 if (!neigh_node)
 186                         return 0;
 187         }
 188
 189         orig_node->last_valid = jiffies;
 190
 191         /* pay attention to not get a value bigger than 100 % */
 192         total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
 193                        neigh_node->real_packet_count ?
 194                        neigh_node->real_packet_count :
 195                        orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
 196
 197         /* if we have too few packets (too less data) we set tq_own to zero */
 198         /* if we receive too few packets it is not considered bidirectional */
 199         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 200             (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 201                 orig_neigh_node->tq_own = 0;
 202         else
 203                 /* neigh_node->real_packet_count is never zero as we
 204                  * only purge old information when getting new
 205                  * information */
 206                 orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
 207                         neigh_node->real_packet_count;
 208
 209         /*
 210          * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 211          * affect the nearly-symmetric links only a little, but
 212          * punishes asymmetric links more.  This will give a value
 213          * between 0 and TQ_MAX_VALUE
 214          */
 215         orig_neigh_node->tq_asym_penalty =
 216                 TQ_MAX_VALUE -
 217                 (TQ_MAX_VALUE *
 218                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 219                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 220                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
 221                 (TQ_LOCAL_WINDOW_SIZE *
 222                  TQ_LOCAL_WINDOW_SIZE *
 223                  TQ_LOCAL_WINDOW_SIZE);
 224
 225         batman_packet->tq = ((batman_packet->tq *
 226                               orig_neigh_node->tq_own *
 227                               orig_neigh_node->tq_asym_penalty) /
 228                              (TQ_MAX_VALUE * TQ_MAX_VALUE));
 229
 230         bat_dbg(DBG_BATMAN, bat_priv,
 231                 "bidirectional: "
 232                 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
 233                 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
 234                 "total tq: %3i\n",
 235                 orig_node->orig, orig_neigh_node->orig, total_count,
 236                 neigh_node->real_packet_count, orig_neigh_node->tq_own,
 237                 orig_neigh_node->tq_asym_penalty, batman_packet->tq);
 238
 239         /* if link has the minimum required transmission quality
 240          * consider it bidirectional */
 241         if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 242                 return 1;
 243
 244         return 0;
 245 }
 246
 247 static void update_orig(struct bat_priv *bat_priv,
 248                         struct orig_node *orig_node,
 249                         struct ethhdr *ethhdr,
 250                         struct batman_packet *batman_packet,
 251                         struct batman_if *if_incoming,
 252                         unsigned char *hna_buff, int hna_buff_len,
 253                         char is_duplicate)
 254 {
 255         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 256         int tmp_hna_buff_len;
 257
 258         bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
 259                 "Searching and updating originator entry of received packet\n");
 260
 261         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 262                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 263                     (tmp_neigh_node->if_incoming == if_incoming)) {
 264                         neigh_node = tmp_neigh_node;
 265                         continue;
 266                 }
 267
 268                 if (is_duplicate)
 269                         continue;
 270
 271                 ring_buffer_set(tmp_neigh_node->tq_recv,
 272                                 &tmp_neigh_node->tq_index, 0);
 273                 tmp_neigh_node->tq_avg =
 274                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 275         }
 276
 277         if (!neigh_node) {
 278                 struct orig_node *orig_tmp;
 279
 280                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 281                 if (!orig_tmp)
 282                         return;
 283
 284                 neigh_node = create_neighbor(orig_node, orig_tmp,
 285                                              ethhdr->h_source, if_incoming);
 286                 if (!neigh_node)
 287                         return;
 288         } else
 289                 bat_dbg(DBG_BATMAN, bat_priv,
 290                         "Updating existing last-hop neighbor of originator\n");
 291
 292         orig_node->flags = batman_packet->flags;
 293         neigh_node->last_valid = jiffies;
 294
 295         ring_buffer_set(neigh_node->tq_recv,
 296                         &neigh_node->tq_index,
 297                         batman_packet->tq);
 298         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 299
 300         if (!is_duplicate) {
 301                 orig_node->last_ttl = batman_packet->ttl;
 302                 neigh_node->last_ttl = batman_packet->ttl;
 303         }
 304
 305         tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
 306                             batman_packet->num_hna * ETH_ALEN : hna_buff_len);
 307
 308         /* if this neighbor already is our next hop there is nothing
 309          * to change */
 310         if (orig_node->router == neigh_node)
 311                 goto update_hna;
 312
 313         /* if this neighbor does not offer a better TQ we won't consider it */
 314         if ((orig_node->router) &&
 315             (orig_node->router->tq_avg > neigh_node->tq_avg))
 316                 goto update_hna;
 317
 318         /* if the TQ is the same and the link not more symetric we
 319          * won't consider it either */
 320         if ((orig_node->router) &&
 321              ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
 322              (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
 323               >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
 324                 goto update_hna;
 325
 326         update_routes(bat_priv, orig_node, neigh_node,
 327                       hna_buff, tmp_hna_buff_len);
 328         goto update_gw;
 329
 330 update_hna:
 331         update_routes(bat_priv, orig_node, orig_node->router,
 332                       hna_buff, tmp_hna_buff_len);
 333
 334 update_gw:
 335         if (orig_node->gw_flags != batman_packet->gw_flags)
 336                 gw_node_update(bat_priv, orig_node, batman_packet->gw_flags);
 337
 338         orig_node->gw_flags = batman_packet->gw_flags;
 339
 340         /* restart gateway selection if fast or late switching was enabled */
 341         if ((orig_node->gw_flags) &&
 342             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 343             (atomic_read(&bat_priv->gw_sel_class) > 2))
 344                 gw_check_election(bat_priv, orig_node);
 345 }
 346
 347 /* checks whether the host restarted and is in the protection time.
 348  * returns:
 349  *  0 if the packet is to be accepted
 350  *  1 if the packet is to be ignored.
 351  */
 352 static int window_protected(struct bat_priv *bat_priv,
 353                             int32_t seq_num_diff,
 354                             unsigned long *last_reset)
 355 {
 356         if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
 357                 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
 358                 if (time_after(jiffies, *last_reset +
 359                         msecs_to_jiffies(RESET_PROTECTION_MS))) {
 360
 361                         *last_reset = jiffies;
 362                         bat_dbg(DBG_BATMAN, bat_priv,
 363                                 "old packet received, start protection\n");
 364
 365                         return 0;
 366                 } else
 367                         return 1;
 368         }
 369         return 0;
 370 }
 371
 372 /* processes a batman packet for all interfaces, adjusts the sequence number and
 373  * finds out whether it is a duplicate.
 374  * returns:
 375  *   1 the packet is a duplicate
 376  *   0 the packet has not yet been received
 377  *  -1 the packet is old and has been received while the seqno window
 378  *     was protected. Caller should drop it.
 379  */
 380 static char count_real_packets(struct ethhdr *ethhdr,
 381                                struct batman_packet *batman_packet,
 382                                struct batman_if *if_incoming)
 383 {
 384         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 385         struct orig_node *orig_node;
 386         struct neigh_node *tmp_neigh_node;
 387         char is_duplicate = 0;
 388         int32_t seq_diff;
 389         int need_update = 0;
 390         int set_mark;
 391
 392         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 393         if (!orig_node)
 394                 return 0;
 395
 396         seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
 397
 398         /* signalize caller that the packet is to be dropped. */
 399         if (window_protected(bat_priv, seq_diff,
 400                              &orig_node->batman_seqno_reset))
 401                 return -1;
 402
 403         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 404
 405                 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
 406                                                orig_node->last_real_seqno,
 407                                                batman_packet->seqno);
 408
 409                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 410                     (tmp_neigh_node->if_incoming == if_incoming))
 411                         set_mark = 1;
 412                 else
 413                         set_mark = 0;
 414
 415                 /* if the window moved, set the update flag. */
 416                 need_update |= bit_get_packet(bat_priv,
 417                                               tmp_neigh_node->real_bits,
 418                                               seq_diff, set_mark);
 419
 420                 tmp_neigh_node->real_packet_count =
 421                         bit_packet_count(tmp_neigh_node->real_bits);
 422         }
 423
 424         if (need_update) {
 425                 bat_dbg(DBG_BATMAN, bat_priv,
 426                         "updating last_seqno: old %d, new %d\n",
 427                         orig_node->last_real_seqno, batman_packet->seqno);
 428                 orig_node->last_real_seqno = batman_packet->seqno;
 429         }
 430
 431         return is_duplicate;
 432 }
 433
 434 /* copy primary address for bonding */
 435 static void mark_bonding_address(struct orig_node *orig_node,
 436                                  struct orig_node *orig_neigh_node,
 437                                  struct batman_packet *batman_packet)
 438
 439 {
 440         if (batman_packet->flags & PRIMARIES_FIRST_HOP)
 441                 memcpy(orig_neigh_node->primary_addr,
 442                        orig_node->orig, ETH_ALEN);
 443
 444         return;
 445 }
 446
 447 /* mark possible bond.candidates in the neighbor list */
 448 void update_bonding_candidates(struct orig_node *orig_node)
 449 {
 450         int candidates;
 451         int interference_candidate;
 452         int best_tq;
 453         struct neigh_node *tmp_neigh_node, *tmp_neigh_node2;
 454         struct neigh_node *first_candidate, *last_candidate;
 455
 456         /* update the candidates for this originator */
 457         if (!orig_node->router) {
 458                 orig_node->bond.candidates = 0;
 459                 return;
 460         }
 461
 462         best_tq = orig_node->router->tq_avg;
 463
 464         /* update bond.candidates */
 465
 466         candidates = 0;
 467
 468         /* mark other nodes which also received "PRIMARIES FIRST HOP" packets
 469          * as "bonding partner" */
 470
 471         /* first, zero the list */
 472         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 473                 tmp_neigh_node->next_bond_candidate = NULL;
 474         }
 475
 476         first_candidate = NULL;
 477         last_candidate = NULL;
 478         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 479
 480                 /* only consider if it has the same primary address ...  */
 481                 if (memcmp(orig_node->orig,
 482                                 tmp_neigh_node->orig_node->primary_addr,
 483                                 ETH_ALEN) != 0)
 484                         continue;
 485
 486                 /* ... and is good enough to be considered */
 487                 if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
 488                         continue;
 489
 490                 /* check if we have another candidate with the same
 491                  * mac address or interface. If we do, we won't
 492                  * select this candidate because of possible interference. */
 493
 494                 interference_candidate = 0;
 495                 list_for_each_entry(tmp_neigh_node2,
 496                                 &orig_node->neigh_list, list) {
 497
 498                         if (tmp_neigh_node2 == tmp_neigh_node)
 499                                 continue;
 500
 501                         /* we only care if the other candidate is even
 502                          * considered as candidate. */
 503                         if (!tmp_neigh_node2->next_bond_candidate)
 504                                 continue;
 505
 506
 507                         if ((tmp_neigh_node->if_incoming ==
 508                                 tmp_neigh_node2->if_incoming)
 509                                 || (memcmp(tmp_neigh_node->addr,
 510                                 tmp_neigh_node2->addr, ETH_ALEN) == 0)) {
 511
 512                                 interference_candidate = 1;
 513                                 break;
 514                         }
 515                 }
 516                 /* don't care further if it is an interference candidate */
 517                 if (interference_candidate)
 518                         continue;
 519
 520                 if (!first_candidate) {
 521                         first_candidate = tmp_neigh_node;
 522                         tmp_neigh_node->next_bond_candidate = first_candidate;
 523                 } else
 524                         tmp_neigh_node->next_bond_candidate = last_candidate;
 525
 526                 last_candidate = tmp_neigh_node;
 527
 528                 candidates++;
 529         }
 530
 531         if (candidates > 0) {
 532                 first_candidate->next_bond_candidate = last_candidate;
 533                 orig_node->bond.selected = first_candidate;
 534         }
 535
 536         orig_node->bond.candidates = candidates;
 537 }
 538
 539 void receive_bat_packet(struct ethhdr *ethhdr,
 540                                 struct batman_packet *batman_packet,
 541                                 unsigned char *hna_buff, int hna_buff_len,
 542                                 struct batman_if *if_incoming)
 543 {
 544         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 545         struct batman_if *batman_if;
 546         struct orig_node *orig_neigh_node, *orig_node;
 547         char has_directlink_flag;
 548         char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 549         char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 550         char is_duplicate;
 551         uint32_t if_incoming_seqno;
 552
 553         /* Silently drop when the batman packet is actually not a
 554          * correct packet.
 555          *
 556          * This might happen if a packet is padded (e.g. Ethernet has a
 557          * minimum frame length of 64 byte) and the aggregation interprets
 558          * it as an additional length.
 559          *
 560          * TODO: A more sane solution would be to have a bit in the
 561          * batman_packet to detect whether the packet is the last
 562          * packet in an aggregation.  Here we expect that the padding
 563          * is always zero (or not 0x01)
 564          */
 565         if (batman_packet->packet_type != BAT_PACKET)
 566                 return;
 567
 568         /* could be changed by schedule_own_packet() */
 569         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 570
 571         has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
 572
 573         is_single_hop_neigh = (compare_orig(ethhdr->h_source,
 574                                             batman_packet->orig) ? 1 : 0);
 575
 576         bat_dbg(DBG_BATMAN, bat_priv,
 577                 "Received BATMAN packet via NB: %pM, IF: %s [%pM] "
 578                 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
 579                 "TTL %d, V %d, IDF %d)\n",
 580                 ethhdr->h_source, if_incoming->net_dev->name,
 581                 if_incoming->net_dev->dev_addr, batman_packet->orig,
 582                 batman_packet->prev_sender, batman_packet->seqno,
 583                 batman_packet->tq, batman_packet->ttl, batman_packet->version,
 584                 has_directlink_flag);
 585
 586         rcu_read_lock();
 587         list_for_each_entry_rcu(batman_if, &if_list, list) {
 588                 if (batman_if->if_status != IF_ACTIVE)
 589                         continue;
 590
 591                 if (batman_if->soft_iface != if_incoming->soft_iface)
 592                         continue;
 593
 594                 if (compare_orig(ethhdr->h_source,
 595                                  batman_if->net_dev->dev_addr))
 596                         is_my_addr = 1;
 597
 598                 if (compare_orig(batman_packet->orig,
 599                                  batman_if->net_dev->dev_addr))
 600                         is_my_orig = 1;
 601
 602                 if (compare_orig(batman_packet->prev_sender,
 603                                  batman_if->net_dev->dev_addr))
 604                         is_my_oldorig = 1;
 605
 606                 if (compare_orig(ethhdr->h_source, broadcast_addr))
 607                         is_broadcast = 1;
 608         }
 609         rcu_read_unlock();
 610
 611         if (batman_packet->version != COMPAT_VERSION) {
 612                 bat_dbg(DBG_BATMAN, bat_priv,
 613                         "Drop packet: incompatible batman version (%i)\n",
 614                         batman_packet->version);
 615                 return;
 616         }
 617
 618         if (is_my_addr) {
 619                 bat_dbg(DBG_BATMAN, bat_priv,
 620                         "Drop packet: received my own broadcast (sender: %pM"
 621                         ")\n",
 622                         ethhdr->h_source);
 623                 return;
 624         }
 625
 626         if (is_broadcast) {
 627                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 628                 "ignoring all packets with broadcast source addr (sender: %pM"
 629                 ")\n", ethhdr->h_source);
 630                 return;
 631         }
 632
 633         if (is_my_orig) {
 634                 unsigned long *word;
 635                 int offset;
 636
 637                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
 638
 639                 if (!orig_neigh_node)
 640                         return;
 641
 642                 /* neighbor has to indicate direct link and it has to
 643                  * come via the corresponding interface */
 644                 /* if received seqno equals last send seqno save new
 645                  * seqno for bidirectional check */
 646                 if (has_directlink_flag &&
 647                     compare_orig(if_incoming->net_dev->dev_addr,
 648                                  batman_packet->orig) &&
 649                     (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
 650                         offset = if_incoming->if_num * NUM_WORDS;
 651                         word = &(orig_neigh_node->bcast_own[offset]);
 652                         bit_mark(word, 0);
 653                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
 654                                 bit_packet_count(word);
 655                 }
 656
 657                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 658                         "originator packet from myself (via neighbor)\n");
 659                 return;
 660         }
 661
 662         if (is_my_oldorig) {
 663                 bat_dbg(DBG_BATMAN, bat_priv,
 664                         "Drop packet: ignoring all rebroadcast echos (sender: "
 665                         "%pM)\n", ethhdr->h_source);
 666                 return;
 667         }
 668
 669         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 670         if (!orig_node)
 671                 return;
 672
 673         is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
 674
 675         if (is_duplicate == -1) {
 676                 bat_dbg(DBG_BATMAN, bat_priv,
 677                         "Drop packet: packet within seqno protection time "
 678                         "(sender: %pM)\n", ethhdr->h_source);
 679                 return;
 680         }
 681
 682         if (batman_packet->tq == 0) {
 683                 bat_dbg(DBG_BATMAN, bat_priv,
 684                         "Drop packet: originator packet with tq equal 0\n");
 685                 return;
 686         }
 687
 688         /* avoid temporary routing loops */
 689         if ((orig_node->router) &&
 690             (orig_node->router->orig_node->router) &&
 691             (compare_orig(orig_node->router->addr,
 692                           batman_packet->prev_sender)) &&
 693             !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
 694             (compare_orig(orig_node->router->addr,
 695                           orig_node->router->orig_node->router->addr))) {
 696                 bat_dbg(DBG_BATMAN, bat_priv,
 697                         "Drop packet: ignoring all rebroadcast packets that "
 698                         "may make me loop (sender: %pM)\n", ethhdr->h_source);
 699                 return;
 700         }
 701
 702         /* if sender is a direct neighbor the sender mac equals
 703          * originator mac */
 704         orig_neigh_node = (is_single_hop_neigh ?
 705                            orig_node :
 706                            get_orig_node(bat_priv, ethhdr->h_source));
 707         if (!orig_neigh_node)
 708                 return;
 709
 710         /* drop packet if sender is not a direct neighbor and if we
 711          * don't route towards it */
 712         if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
 713                 bat_dbg(DBG_BATMAN, bat_priv,
 714                         "Drop packet: OGM via unknown neighbor!\n");
 715                 return;
 716         }
 717
 718         is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
 719                                                 batman_packet, if_incoming);
 720
 721         /* update ranking if it is not a duplicate or has the same
 722          * seqno and similar ttl as the non-duplicate */
 723         if (is_bidirectional &&
 724             (!is_duplicate ||
 725              ((orig_node->last_real_seqno == batman_packet->seqno) &&
 726               (orig_node->last_ttl - 3 <= batman_packet->ttl))))
 727                 update_orig(bat_priv, orig_node, ethhdr, batman_packet,
 728                             if_incoming, hna_buff, hna_buff_len, is_duplicate);
 729
 730         mark_bonding_address(orig_node, orig_neigh_node, batman_packet);
 731         update_bonding_candidates(orig_node);
 732
 733         /* is single hop (direct) neighbor */
 734         if (is_single_hop_neigh) {
 735
 736                 /* mark direct link on incoming interface */
 737                 schedule_forward_packet(orig_node, ethhdr, batman_packet,
 738                                         1, hna_buff_len, if_incoming);
 739
 740                 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
 741                         "rebroadcast neighbor packet with direct link flag\n");
 742                 return;
 743         }
 744
 745         /* multihop originator */
 746         if (!is_bidirectional) {
 747                 bat_dbg(DBG_BATMAN, bat_priv,
 748                         "Drop packet: not received via bidirectional link\n");
 749                 return;
 750         }
 751
 752         if (is_duplicate) {
 753                 bat_dbg(DBG_BATMAN, bat_priv,
 754                         "Drop packet: duplicate packet received\n");
 755                 return;
 756         }
 757
 758         bat_dbg(DBG_BATMAN, bat_priv,
 759                 "Forwarding packet: rebroadcast originator packet\n");
 760         schedule_forward_packet(orig_node, ethhdr, batman_packet,
 761                                 0, hna_buff_len, if_incoming);
 762 }
 763
 764 int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
 765 {
 766         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 767         struct ethhdr *ethhdr;
 768
 769         /* drop packet if it has not necessary minimum size */
 770         if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
 771                 return NET_RX_DROP;
 772
 773         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 774
 775         /* packet with broadcast indication but unicast recipient */
 776         if (!is_broadcast_ether_addr(ethhdr->h_dest))
 777                 return NET_RX_DROP;
 778
 779         /* packet with broadcast sender address */
 780         if (is_broadcast_ether_addr(ethhdr->h_source))
 781                 return NET_RX_DROP;
 782
 783         /* create a copy of the skb, if needed, to modify it. */
 784         if (skb_cow(skb, 0) < 0)
 785                 return NET_RX_DROP;
 786
 787         /* keep skb linear */
 788         if (skb_linearize(skb) < 0)
 789                 return NET_RX_DROP;
 790
 791         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 792
 793         spin_lock_bh(&bat_priv->orig_hash_lock);
 794         receive_aggr_bat_packet(ethhdr,
 795                                 skb->data,
 796                                 skb_headlen(skb),
 797                                 batman_if);
 798         spin_unlock_bh(&bat_priv->orig_hash_lock);
 799
 800         kfree_skb(skb);
 801         return NET_RX_SUCCESS;
 802 }
 803
 804 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
 805                                struct sk_buff *skb, size_t icmp_len)
 806 {
 807         struct orig_node *orig_node;
 808         struct icmp_packet_rr *icmp_packet;
 809         struct batman_if *batman_if;
 810         int ret;
 811         uint8_t dstaddr[ETH_ALEN];
 812
 813         icmp_packet = (struct icmp_packet_rr *)skb->data;
 814
 815         /* add data to device queue */
 816         if (icmp_packet->msg_type != ECHO_REQUEST) {
 817                 bat_socket_receive_packet(icmp_packet, icmp_len);
 818                 return NET_RX_DROP;
 819         }
 820
 821         if (!bat_priv->primary_if)
 822                 return NET_RX_DROP;
 823
 824         /* answer echo request (ping) */
 825         /* get routing information */
 826         spin_lock_bh(&bat_priv->orig_hash_lock);
 827         orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
 828                                                    compare_orig, choose_orig,
 829                                                    icmp_packet->orig));
 830         ret = NET_RX_DROP;
 831
 832         if ((orig_node) && (orig_node->router)) {
 833
 834                 /* don't lock while sending the packets ... we therefore
 835                  * copy the required data before sending */
 836                 batman_if = orig_node->router->if_incoming;
 837                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 838                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 839
 840                 /* create a copy of the skb, if needed, to modify it. */
 841                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 842                         return NET_RX_DROP;
 843
 844                 icmp_packet = (struct icmp_packet_rr *)skb->data;
 845
 846                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 847                 memcpy(icmp_packet->orig,
 848                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 849                 icmp_packet->msg_type = ECHO_REPLY;
 850                 icmp_packet->ttl = TTL;
 851
 852                 send_skb_packet(skb, batman_if, dstaddr);
 853                 ret = NET_RX_SUCCESS;
 854
 855         } else
 856                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 857
 858         return ret;
 859 }
 860
 861 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
 862                                   struct sk_buff *skb)
 863 {
 864         struct orig_node *orig_node;
 865         struct icmp_packet *icmp_packet;
 866         struct batman_if *batman_if;
 867         int ret;
 868         uint8_t dstaddr[ETH_ALEN];
 869
 870         icmp_packet = (struct icmp_packet *)skb->data;
 871
 872         /* send TTL exceeded if packet is an echo request (traceroute) */
 873         if (icmp_packet->msg_type != ECHO_REQUEST) {
 874                 pr_debug("Warning - can't forward icmp packet from %pM to "
 875                          "%pM: ttl exceeded\n", icmp_packet->orig,
 876                          icmp_packet->dst);
 877                 return NET_RX_DROP;
 878         }
 879
 880         if (!bat_priv->primary_if)
 881                 return NET_RX_DROP;
 882
 883         /* get routing information */
 884         spin_lock_bh(&bat_priv->orig_hash_lock);
 885         orig_node = ((struct orig_node *)
 886                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
 887                                icmp_packet->orig));
 888         ret = NET_RX_DROP;
 889
 890         if ((orig_node) && (orig_node->router)) {
 891
 892                 /* don't lock while sending the packets ... we therefore
 893                  * copy the required data before sending */
 894                 batman_if = orig_node->router->if_incoming;
 895                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 896                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 897
 898                 /* create a copy of the skb, if needed, to modify it. */
 899                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 900                         return NET_RX_DROP;
 901
 902                 icmp_packet = (struct icmp_packet *) skb->data;
 903
 904                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 905                 memcpy(icmp_packet->orig,
 906                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 907                 icmp_packet->msg_type = TTL_EXCEEDED;
 908                 icmp_packet->ttl = TTL;
 909
 910                 send_skb_packet(skb, batman_if, dstaddr);
 911                 ret = NET_RX_SUCCESS;
 912
 913         } else
 914                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 915
 916         return ret;
 917 }
 918
 919
 920 int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
 921 {
 922         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
 923         struct icmp_packet_rr *icmp_packet;
 924         struct ethhdr *ethhdr;
 925         struct orig_node *orig_node;
 926         struct batman_if *batman_if;
 927         int hdr_size = sizeof(struct icmp_packet);
 928         int ret;
 929         uint8_t dstaddr[ETH_ALEN];
 930
 931         /**
 932          * we truncate all incoming icmp packets if they don't match our size
 933          */
 934         if (skb->len >= sizeof(struct icmp_packet_rr))
 935                 hdr_size = sizeof(struct icmp_packet_rr);
 936
 937         /* drop packet if it has not necessary minimum size */
 938         if (unlikely(!pskb_may_pull(skb, hdr_size)))
 939                 return NET_RX_DROP;
 940
 941         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 942
 943         /* packet with unicast indication but broadcast recipient */
 944         if (is_broadcast_ether_addr(ethhdr->h_dest))
 945                 return NET_RX_DROP;
 946
 947         /* packet with broadcast sender address */
 948         if (is_broadcast_ether_addr(ethhdr->h_source))
 949                 return NET_RX_DROP;
 950
 951         /* not for me */
 952         if (!is_my_mac(ethhdr->h_dest))
 953                 return NET_RX_DROP;
 954
 955         icmp_packet = (struct icmp_packet_rr *)skb->data;
 956
 957         /* add record route information if not full */
 958         if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
 959             (icmp_packet->rr_cur < BAT_RR_LEN)) {
 960                 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
 961                         ethhdr->h_dest, ETH_ALEN);
 962                 icmp_packet->rr_cur++;
 963         }
 964
 965         /* packet for me */
 966         if (is_my_mac(icmp_packet->dst))
 967                 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
 968
 969         /* TTL exceeded */
 970         if (icmp_packet->ttl < 2)
 971                 return recv_icmp_ttl_exceeded(bat_priv, skb);
 972
 973         ret = NET_RX_DROP;
 974
 975         /* get routing information */
 976         spin_lock_bh(&bat_priv->orig_hash_lock);
 977         orig_node = ((struct orig_node *)
 978                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
 979                                icmp_packet->dst));
 980
 981         if ((orig_node) && (orig_node->router)) {
 982
 983                 /* don't lock while sending the packets ... we therefore
 984                  * copy the required data before sending */
 985                 batman_if = orig_node->router->if_incoming;
 986                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 987                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 988
 989                 /* create a copy of the skb, if needed, to modify it. */
 990                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 991                         return NET_RX_DROP;
 992
 993                 icmp_packet = (struct icmp_packet_rr *)skb->data;
 994
 995                 /* decrement ttl */
 996                 icmp_packet->ttl--;
 997
 998                 /* route it */
 999                 send_skb_packet(skb, batman_if, dstaddr);
1000                 ret = NET_RX_SUCCESS;
1001
1002         } else
1003                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1004
1005         return ret;
1006 }
1007
1008 /* find a suitable router for this originator, and use
1009  * bonding if possible. */
1010 struct neigh_node *find_router(struct bat_priv *bat_priv,
1011                                struct orig_node *orig_node,
1012                                struct batman_if *recv_if)
1013 {
1014         struct orig_node *primary_orig_node;
1015         struct orig_node *router_orig;
1016         struct neigh_node *router, *first_candidate, *best_router;
1017         static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1018         int bonding_enabled;
1019
1020         if (!orig_node)
1021                 return NULL;
1022
1023         if (!orig_node->router)
1024                 return NULL;
1025
1026         /* without bonding, the first node should
1027          * always choose the default router. */
1028
1029         bonding_enabled = atomic_read(&bat_priv->bonding);
1030
1031         if ((!recv_if) && (!bonding_enabled))
1032                 return orig_node->router;
1033
1034         router_orig = orig_node->router->orig_node;
1035
1036         /* if we have something in the primary_addr, we can search
1037          * for a potential bonding candidate. */
1038         if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
1039                 return orig_node->router;
1040
1041         /* find the orig_node which has the primary interface. might
1042          * even be the same as our router_orig in many cases */
1043
1044         if (memcmp(router_orig->primary_addr,
1045                                 router_orig->orig, ETH_ALEN) == 0) {
1046                 primary_orig_node = router_orig;
1047         } else {
1048                 primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig,
1049                                                choose_orig,
1050                                                router_orig->primary_addr);
1051
1052                 if (!primary_orig_node)
1053                         return orig_node->router;
1054         }
1055
1056         /* with less than 2 candidates, we can't do any
1057          * bonding and prefer the original router. */
1058
1059         if (primary_orig_node->bond.candidates < 2)
1060                 return orig_node->router;
1061
1062
1063         /* all nodes between should choose a candidate which
1064          * is is not on the interface where the packet came
1065          * in. */
1066         first_candidate = primary_orig_node->bond.selected;
1067         router = first_candidate;
1068
1069         if (bonding_enabled) {
1070                 /* in the bonding case, send the packets in a round
1071                  * robin fashion over the remaining interfaces. */
1072                 do {
1073                         /* recv_if == NULL on the first node. */
1074                         if (router->if_incoming != recv_if)
1075                                 break;
1076
1077                         router = router->next_bond_candidate;
1078                 } while (router != first_candidate);
1079
1080                 primary_orig_node->bond.selected = router->next_bond_candidate;
1081
1082         } else {
1083                 /* if bonding is disabled, use the best of the
1084                  * remaining candidates which are not using
1085                  * this interface. */
1086                 best_router = first_candidate;
1087
1088                 do {
1089                         /* recv_if == NULL on the first node. */
1090                         if ((router->if_incoming != recv_if) &&
1091                                 (router->tq_avg > best_router->tq_avg))
1092                                         best_router = router;
1093
1094                         router = router->next_bond_candidate;
1095                 } while (router != first_candidate);
1096
1097                 router = best_router;
1098         }
1099
1100         return router;
1101 }
1102
1103 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1104 {
1105         struct ethhdr *ethhdr;
1106
1107         /* drop packet if it has not necessary minimum size */
1108         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1109                 return -1;
1110
1111         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1112
1113         /* packet with unicast indication but broadcast recipient */
1114         if (is_broadcast_ether_addr(ethhdr->h_dest))
1115                 return -1;
1116
1117         /* packet with broadcast sender address */
1118         if (is_broadcast_ether_addr(ethhdr->h_source))
1119                 return -1;
1120
1121         /* not for me */
1122         if (!is_my_mac(ethhdr->h_dest))
1123                 return -1;
1124
1125         return 0;
1126 }
1127
1128 int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
1129                          int hdr_size)
1130 {
1131         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1132         struct orig_node *orig_node;
1133         struct neigh_node *router;
1134         struct batman_if *batman_if;
1135         uint8_t dstaddr[ETH_ALEN];
1136         struct unicast_packet *unicast_packet;
1137         struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
1138         int ret;
1139         struct sk_buff *new_skb;
1140
1141         unicast_packet = (struct unicast_packet *)skb->data;
1142
1143         /* TTL exceeded */
1144         if (unicast_packet->ttl < 2) {
1145                 pr_debug("Warning - can't forward unicast packet from %pM to "
1146                          "%pM: ttl exceeded\n", ethhdr->h_source,
1147                          unicast_packet->dest);
1148                 return NET_RX_DROP;
1149         }
1150
1151         /* get routing information */
1152         spin_lock_bh(&bat_priv->orig_hash_lock);
1153         orig_node = ((struct orig_node *)
1154                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
1155                                unicast_packet->dest));
1156
1157         router = find_router(bat_priv, orig_node, recv_if);
1158
1159         if (!router) {
1160                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1161                 return NET_RX_DROP;
1162         }
1163
1164         /* don't lock while sending the packets ... we therefore
1165          * copy the required data before sending */
1166
1167         batman_if = router->if_incoming;
1168         memcpy(dstaddr, router->addr, ETH_ALEN);
1169
1170         spin_unlock_bh(&bat_priv->orig_hash_lock);
1171
1172         /* create a copy of the skb, if needed, to modify it. */
1173         if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1174                 return NET_RX_DROP;
1175
1176         unicast_packet = (struct unicast_packet *)skb->data;
1177
1178         if (unicast_packet->packet_type == BAT_UNICAST &&
1179             atomic_read(&bat_priv->fragmentation) &&
1180             skb->len > batman_if->net_dev->mtu)
1181                 return frag_send_skb(skb, bat_priv, batman_if,
1182                                      dstaddr);
1183
1184         if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
1185             frag_can_reassemble(skb, batman_if->net_dev->mtu)) {
1186
1187                 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1188
1189                 if (ret == NET_RX_DROP)
1190                         return NET_RX_DROP;
1191
1192                 /* packet was buffered for late merge */
1193                 if (!new_skb)
1194                         return NET_RX_SUCCESS;
1195
1196                 skb = new_skb;
1197                 unicast_packet = (struct unicast_packet *)skb->data;
1198         }
1199
1200         /* decrement ttl */
1201         unicast_packet->ttl--;
1202
1203         /* route it */
1204         send_skb_packet(skb, batman_if, dstaddr);
1205
1206         return NET_RX_SUCCESS;
1207 }
1208
1209 int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1210 {
1211         struct unicast_packet *unicast_packet;
1212         int hdr_size = sizeof(struct unicast_packet);
1213
1214         if (check_unicast_packet(skb, hdr_size) < 0)
1215                 return NET_RX_DROP;
1216
1217         unicast_packet = (struct unicast_packet *)skb->data;
1218
1219         /* packet for me */
1220         if (is_my_mac(unicast_packet->dest)) {
1221                 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1222                 return NET_RX_SUCCESS;
1223         }
1224
1225         return route_unicast_packet(skb, recv_if, hdr_size);
1226 }
1227
1228 int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
1229 {
1230         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1231         struct unicast_frag_packet *unicast_packet;
1232         int hdr_size = sizeof(struct unicast_frag_packet);
1233         struct sk_buff *new_skb = NULL;
1234         int ret;
1235
1236         if (check_unicast_packet(skb, hdr_size) < 0)
1237                 return NET_RX_DROP;
1238
1239         unicast_packet = (struct unicast_frag_packet *)skb->data;
1240
1241         /* packet for me */
1242         if (is_my_mac(unicast_packet->dest)) {
1243
1244                 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1245
1246                 if (ret == NET_RX_DROP)
1247                         return NET_RX_DROP;
1248
1249                 /* packet was buffered for late merge */
1250                 if (!new_skb)
1251                         return NET_RX_SUCCESS;
1252
1253                 interface_rx(recv_if->soft_iface, new_skb, recv_if,
1254                              sizeof(struct unicast_packet));
1255                 return NET_RX_SUCCESS;
1256         }
1257
1258         return route_unicast_packet(skb, recv_if, hdr_size);
1259 }
1260
1261
1262 int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1263 {
1264         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1265         struct orig_node *orig_node;
1266         struct bcast_packet *bcast_packet;
1267         struct ethhdr *ethhdr;
1268         int hdr_size = sizeof(struct bcast_packet);
1269         int32_t seq_diff;
1270
1271         /* drop packet if it has not necessary minimum size */
1272         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1273                 return NET_RX_DROP;
1274
1275         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1276
1277         /* packet with broadcast indication but unicast recipient */
1278         if (!is_broadcast_ether_addr(ethhdr->h_dest))
1279                 return NET_RX_DROP;
1280
1281         /* packet with broadcast sender address */
1282         if (is_broadcast_ether_addr(ethhdr->h_source))
1283                 return NET_RX_DROP;
1284
1285         /* ignore broadcasts sent by myself */
1286         if (is_my_mac(ethhdr->h_source))
1287                 return NET_RX_DROP;
1288
1289         bcast_packet = (struct bcast_packet *)skb->data;
1290
1291         /* ignore broadcasts originated by myself */
1292         if (is_my_mac(bcast_packet->orig))
1293                 return NET_RX_DROP;
1294
1295         if (bcast_packet->ttl < 2)
1296                 return NET_RX_DROP;
1297
1298         spin_lock_bh(&bat_priv->orig_hash_lock);
1299         orig_node = ((struct orig_node *)
1300                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
1301                                bcast_packet->orig));
1302
1303         if (!orig_node) {
1304                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1305                 return NET_RX_DROP;
1306         }
1307
1308         /* check whether the packet is a duplicate */
1309         if (get_bit_status(orig_node->bcast_bits,
1310                            orig_node->last_bcast_seqno,
1311                            ntohl(bcast_packet->seqno))) {
1312                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1313                 return NET_RX_DROP;
1314         }
1315
1316         seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1317
1318         /* check whether the packet is old and the host just restarted. */
1319         if (window_protected(bat_priv, seq_diff,
1320                              &orig_node->bcast_seqno_reset)) {
1321                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1322                 return NET_RX_DROP;
1323         }
1324
1325         /* mark broadcast in flood history, update window position
1326          * if required. */
1327         if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1328                 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1329
1330         spin_unlock_bh(&bat_priv->orig_hash_lock);
1331         /* rebroadcast packet */
1332         add_bcast_packet_to_list(bat_priv, skb);
1333
1334         /* broadcast for me */
1335         interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1336
1337         return NET_RX_SUCCESS;
1338 }
1339
1340 int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if)
1341 {
1342         struct vis_packet *vis_packet;
1343         struct ethhdr *ethhdr;
1344         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1345         int hdr_size = sizeof(struct vis_packet);
1346
1347         /* keep skb linear */
1348         if (skb_linearize(skb) < 0)
1349                 return NET_RX_DROP;
1350
1351         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1352                 return NET_RX_DROP;
1353
1354         vis_packet = (struct vis_packet *)skb->data;
1355         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1356
1357         /* not for me */
1358         if (!is_my_mac(ethhdr->h_dest))
1359                 return NET_RX_DROP;
1360
1361         /* ignore own packets */
1362         if (is_my_mac(vis_packet->vis_orig))
1363                 return NET_RX_DROP;
1364
1365         if (is_my_mac(vis_packet->sender_orig))
1366                 return NET_RX_DROP;
1367
1368         switch (vis_packet->vis_type) {
1369         case VIS_TYPE_SERVER_SYNC:
1370                 receive_server_sync_packet(bat_priv, vis_packet,
1371                                            skb_headlen(skb));
1372                 break;
1373
1374         case VIS_TYPE_CLIENT_UPDATE:
1375                 receive_client_update_packet(bat_priv, vis_packet,
1376                                              skb_headlen(skb));
1377                 break;
1378
1379         default:        /* ignore unknown packet */
1380                 break;
1381         }
1382
1383         /* We take a copy of the data in the packet, so we should
1384            always free the skbuf. */
1385         return NET_RX_DROP;
1386 }