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         struct neigh_node *neigh_node_tmp;
  93
  94         /* route deleted */
  95         if ((orig_node->router) && (!neigh_node)) {
  96
  97                 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
  98                         orig_node->orig);
  99                 hna_global_del_orig(bat_priv, orig_node,
 100                                     "originator timed out");
 101
 102                 /* route added */
 103         } else if ((!orig_node->router) && (neigh_node)) {
 104
 105                 bat_dbg(DBG_ROUTES, bat_priv,
 106                         "Adding route towards: %pM (via %pM)\n",
 107                         orig_node->orig, neigh_node->addr);
 108                 hna_global_add_orig(bat_priv, orig_node,
 109                                     hna_buff, hna_buff_len);
 110
 111                 /* route changed */
 112         } else {
 113                 bat_dbg(DBG_ROUTES, bat_priv,
 114                         "Changing route towards: %pM "
 115                         "(now via %pM - was via %pM)\n",
 116                         orig_node->orig, neigh_node->addr,
 117                         orig_node->router->addr);
 118         }
 119
 120         if (neigh_node)
 121                 kref_get(&neigh_node->refcount);
 122         neigh_node_tmp = orig_node->router;
 123         orig_node->router = neigh_node;
 124         if (neigh_node_tmp)
 125                 kref_put(&neigh_node_tmp->refcount, neigh_node_free_ref);
 126 }
 127
 128
 129 void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
 130                    struct neigh_node *neigh_node, unsigned char *hna_buff,
 131                    int hna_buff_len)
 132 {
 133
 134         if (!orig_node)
 135                 return;
 136
 137         if (orig_node->router != neigh_node)
 138                 update_route(bat_priv, orig_node, neigh_node,
 139                              hna_buff, hna_buff_len);
 140         /* may be just HNA changed */
 141         else
 142                 update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
 143 }
 144
 145 static int is_bidirectional_neigh(struct orig_node *orig_node,
 146                                 struct orig_node *orig_neigh_node,
 147                                 struct batman_packet *batman_packet,
 148                                 struct batman_if *if_incoming)
 149 {
 150         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 151         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 152         unsigned char total_count;
 153
 154         if (orig_node == orig_neigh_node) {
 155                 list_for_each_entry(tmp_neigh_node,
 156                                     &orig_node->neigh_list,
 157                                     list) {
 158
 159                         if (compare_orig(tmp_neigh_node->addr,
 160                                          orig_neigh_node->orig) &&
 161                             (tmp_neigh_node->if_incoming == if_incoming))
 162                                 neigh_node = tmp_neigh_node;
 163                 }
 164
 165                 if (!neigh_node)
 166                         neigh_node = create_neighbor(orig_node,
 167                                                      orig_neigh_node,
 168                                                      orig_neigh_node->orig,
 169                                                      if_incoming);
 170                 /* create_neighbor failed, return 0 */
 171                 if (!neigh_node)
 172                         return 0;
 173
 174                 neigh_node->last_valid = jiffies;
 175         } else {
 176                 /* find packet count of corresponding one hop neighbor */
 177                 list_for_each_entry(tmp_neigh_node,
 178                                     &orig_neigh_node->neigh_list, list) {
 179
 180                         if (compare_orig(tmp_neigh_node->addr,
 181                                          orig_neigh_node->orig) &&
 182                             (tmp_neigh_node->if_incoming == if_incoming))
 183                                 neigh_node = tmp_neigh_node;
 184                 }
 185
 186                 if (!neigh_node)
 187                         neigh_node = create_neighbor(orig_neigh_node,
 188                                                      orig_neigh_node,
 189                                                      orig_neigh_node->orig,
 190                                                      if_incoming);
 191                 /* create_neighbor failed, return 0 */
 192                 if (!neigh_node)
 193                         return 0;
 194         }
 195
 196         orig_node->last_valid = jiffies;
 197
 198         /* pay attention to not get a value bigger than 100 % */
 199         total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
 200                        neigh_node->real_packet_count ?
 201                        neigh_node->real_packet_count :
 202                        orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
 203
 204         /* if we have too few packets (too less data) we set tq_own to zero */
 205         /* if we receive too few packets it is not considered bidirectional */
 206         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 207             (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 208                 orig_neigh_node->tq_own = 0;
 209         else
 210                 /* neigh_node->real_packet_count is never zero as we
 211                  * only purge old information when getting new
 212                  * information */
 213                 orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
 214                         neigh_node->real_packet_count;
 215
 216         /*
 217          * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 218          * affect the nearly-symmetric links only a little, but
 219          * punishes asymmetric links more.  This will give a value
 220          * between 0 and TQ_MAX_VALUE
 221          */
 222         orig_neigh_node->tq_asym_penalty =
 223                 TQ_MAX_VALUE -
 224                 (TQ_MAX_VALUE *
 225                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 226                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 227                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
 228                 (TQ_LOCAL_WINDOW_SIZE *
 229                  TQ_LOCAL_WINDOW_SIZE *
 230                  TQ_LOCAL_WINDOW_SIZE);
 231
 232         batman_packet->tq = ((batman_packet->tq *
 233                               orig_neigh_node->tq_own *
 234                               orig_neigh_node->tq_asym_penalty) /
 235                              (TQ_MAX_VALUE * TQ_MAX_VALUE));
 236
 237         bat_dbg(DBG_BATMAN, bat_priv,
 238                 "bidirectional: "
 239                 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
 240                 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
 241                 "total tq: %3i\n",
 242                 orig_node->orig, orig_neigh_node->orig, total_count,
 243                 neigh_node->real_packet_count, orig_neigh_node->tq_own,
 244                 orig_neigh_node->tq_asym_penalty, batman_packet->tq);
 245
 246         /* if link has the minimum required transmission quality
 247          * consider it bidirectional */
 248         if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 249                 return 1;
 250
 251         return 0;
 252 }
 253
 254 static void update_orig(struct bat_priv *bat_priv,
 255                         struct orig_node *orig_node,
 256                         struct ethhdr *ethhdr,
 257                         struct batman_packet *batman_packet,
 258                         struct batman_if *if_incoming,
 259                         unsigned char *hna_buff, int hna_buff_len,
 260                         char is_duplicate)
 261 {
 262         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 263         int tmp_hna_buff_len;
 264
 265         bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
 266                 "Searching and updating originator entry of received packet\n");
 267
 268         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 269                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 270                     (tmp_neigh_node->if_incoming == if_incoming)) {
 271                         neigh_node = tmp_neigh_node;
 272                         continue;
 273                 }
 274
 275                 if (is_duplicate)
 276                         continue;
 277
 278                 ring_buffer_set(tmp_neigh_node->tq_recv,
 279                                 &tmp_neigh_node->tq_index, 0);
 280                 tmp_neigh_node->tq_avg =
 281                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 282         }
 283
 284         if (!neigh_node) {
 285                 struct orig_node *orig_tmp;
 286
 287                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 288                 if (!orig_tmp)
 289                         return;
 290
 291                 neigh_node = create_neighbor(orig_node, orig_tmp,
 292                                              ethhdr->h_source, if_incoming);
 293                 if (!neigh_node)
 294                         return;
 295         } else
 296                 bat_dbg(DBG_BATMAN, bat_priv,
 297                         "Updating existing last-hop neighbor of originator\n");
 298
 299         orig_node->flags = batman_packet->flags;
 300         neigh_node->last_valid = jiffies;
 301
 302         ring_buffer_set(neigh_node->tq_recv,
 303                         &neigh_node->tq_index,
 304                         batman_packet->tq);
 305         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 306
 307         if (!is_duplicate) {
 308                 orig_node->last_ttl = batman_packet->ttl;
 309                 neigh_node->last_ttl = batman_packet->ttl;
 310         }
 311
 312         tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
 313                             batman_packet->num_hna * ETH_ALEN : hna_buff_len);
 314
 315         /* if this neighbor already is our next hop there is nothing
 316          * to change */
 317         if (orig_node->router == neigh_node)
 318                 goto update_hna;
 319
 320         /* if this neighbor does not offer a better TQ we won't consider it */
 321         if ((orig_node->router) &&
 322             (orig_node->router->tq_avg > neigh_node->tq_avg))
 323                 goto update_hna;
 324
 325         /* if the TQ is the same and the link not more symetric we
 326          * won't consider it either */
 327         if ((orig_node->router) &&
 328              ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
 329              (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
 330               >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
 331                 goto update_hna;
 332
 333         update_routes(bat_priv, orig_node, neigh_node,
 334                       hna_buff, tmp_hna_buff_len);
 335         goto update_gw;
 336
 337 update_hna:
 338         update_routes(bat_priv, orig_node, orig_node->router,
 339                       hna_buff, tmp_hna_buff_len);
 340
 341 update_gw:
 342         if (orig_node->gw_flags != batman_packet->gw_flags)
 343                 gw_node_update(bat_priv, orig_node, batman_packet->gw_flags);
 344
 345         orig_node->gw_flags = batman_packet->gw_flags;
 346
 347         /* restart gateway selection if fast or late switching was enabled */
 348         if ((orig_node->gw_flags) &&
 349             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 350             (atomic_read(&bat_priv->gw_sel_class) > 2))
 351                 gw_check_election(bat_priv, orig_node);
 352 }
 353
 354 /* checks whether the host restarted and is in the protection time.
 355  * returns:
 356  *  0 if the packet is to be accepted
 357  *  1 if the packet is to be ignored.
 358  */
 359 static int window_protected(struct bat_priv *bat_priv,
 360                             int32_t seq_num_diff,
 361                             unsigned long *last_reset)
 362 {
 363         if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
 364                 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
 365                 if (time_after(jiffies, *last_reset +
 366                         msecs_to_jiffies(RESET_PROTECTION_MS))) {
 367
 368                         *last_reset = jiffies;
 369                         bat_dbg(DBG_BATMAN, bat_priv,
 370                                 "old packet received, start protection\n");
 371
 372                         return 0;
 373                 } else
 374                         return 1;
 375         }
 376         return 0;
 377 }
 378
 379 /* processes a batman packet for all interfaces, adjusts the sequence number and
 380  * finds out whether it is a duplicate.
 381  * returns:
 382  *   1 the packet is a duplicate
 383  *   0 the packet has not yet been received
 384  *  -1 the packet is old and has been received while the seqno window
 385  *     was protected. Caller should drop it.
 386  */
 387 static char count_real_packets(struct ethhdr *ethhdr,
 388                                struct batman_packet *batman_packet,
 389                                struct batman_if *if_incoming)
 390 {
 391         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 392         struct orig_node *orig_node;
 393         struct neigh_node *tmp_neigh_node;
 394         char is_duplicate = 0;
 395         int32_t seq_diff;
 396         int need_update = 0;
 397         int set_mark;
 398
 399         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 400         if (!orig_node)
 401                 return 0;
 402
 403         seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
 404
 405         /* signalize caller that the packet is to be dropped. */
 406         if (window_protected(bat_priv, seq_diff,
 407                              &orig_node->batman_seqno_reset))
 408                 return -1;
 409
 410         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 411
 412                 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
 413                                                orig_node->last_real_seqno,
 414                                                batman_packet->seqno);
 415
 416                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 417                     (tmp_neigh_node->if_incoming == if_incoming))
 418                         set_mark = 1;
 419                 else
 420                         set_mark = 0;
 421
 422                 /* if the window moved, set the update flag. */
 423                 need_update |= bit_get_packet(bat_priv,
 424                                               tmp_neigh_node->real_bits,
 425                                               seq_diff, set_mark);
 426
 427                 tmp_neigh_node->real_packet_count =
 428                         bit_packet_count(tmp_neigh_node->real_bits);
 429         }
 430
 431         if (need_update) {
 432                 bat_dbg(DBG_BATMAN, bat_priv,
 433                         "updating last_seqno: old %d, new %d\n",
 434                         orig_node->last_real_seqno, batman_packet->seqno);
 435                 orig_node->last_real_seqno = batman_packet->seqno;
 436         }
 437
 438         return is_duplicate;
 439 }
 440
 441 /* copy primary address for bonding */
 442 static void mark_bonding_address(struct orig_node *orig_node,
 443                                  struct orig_node *orig_neigh_node,
 444                                  struct batman_packet *batman_packet)
 445
 446 {
 447         if (batman_packet->flags & PRIMARIES_FIRST_HOP)
 448                 memcpy(orig_neigh_node->primary_addr,
 449                        orig_node->orig, ETH_ALEN);
 450
 451         return;
 452 }
 453
 454 /* mark possible bond.candidates in the neighbor list */
 455 void update_bonding_candidates(struct orig_node *orig_node)
 456 {
 457         int candidates;
 458         int interference_candidate;
 459         int best_tq;
 460         struct neigh_node *tmp_neigh_node, *tmp_neigh_node2;
 461         struct neigh_node *first_candidate, *last_candidate;
 462
 463         /* update the candidates for this originator */
 464         if (!orig_node->router) {
 465                 orig_node->bond.candidates = 0;
 466                 return;
 467         }
 468
 469         best_tq = orig_node->router->tq_avg;
 470
 471         /* update bond.candidates */
 472
 473         candidates = 0;
 474
 475         /* mark other nodes which also received "PRIMARIES FIRST HOP" packets
 476          * as "bonding partner" */
 477
 478         /* first, zero the list */
 479         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 480                 tmp_neigh_node->next_bond_candidate = NULL;
 481         }
 482
 483         first_candidate = NULL;
 484         last_candidate = NULL;
 485         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 486
 487                 /* only consider if it has the same primary address ...  */
 488                 if (memcmp(orig_node->orig,
 489                                 tmp_neigh_node->orig_node->primary_addr,
 490                                 ETH_ALEN) != 0)
 491                         continue;
 492
 493                 /* ... and is good enough to be considered */
 494                 if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
 495                         continue;
 496
 497                 /* check if we have another candidate with the same
 498                  * mac address or interface. If we do, we won't
 499                  * select this candidate because of possible interference. */
 500
 501                 interference_candidate = 0;
 502                 list_for_each_entry(tmp_neigh_node2,
 503                                 &orig_node->neigh_list, list) {
 504
 505                         if (tmp_neigh_node2 == tmp_neigh_node)
 506                                 continue;
 507
 508                         /* we only care if the other candidate is even
 509                          * considered as candidate. */
 510                         if (!tmp_neigh_node2->next_bond_candidate)
 511                                 continue;
 512
 513
 514                         if ((tmp_neigh_node->if_incoming ==
 515                                 tmp_neigh_node2->if_incoming)
 516                                 || (memcmp(tmp_neigh_node->addr,
 517                                 tmp_neigh_node2->addr, ETH_ALEN) == 0)) {
 518
 519                                 interference_candidate = 1;
 520                                 break;
 521                         }
 522                 }
 523                 /* don't care further if it is an interference candidate */
 524                 if (interference_candidate)
 525                         continue;
 526
 527                 if (!first_candidate) {
 528                         first_candidate = tmp_neigh_node;
 529                         tmp_neigh_node->next_bond_candidate = first_candidate;
 530                 } else
 531                         tmp_neigh_node->next_bond_candidate = last_candidate;
 532
 533                 last_candidate = tmp_neigh_node;
 534
 535                 candidates++;
 536         }
 537
 538         if (candidates > 0) {
 539                 first_candidate->next_bond_candidate = last_candidate;
 540                 orig_node->bond.selected = first_candidate;
 541         }
 542
 543         orig_node->bond.candidates = candidates;
 544 }
 545
 546 void receive_bat_packet(struct ethhdr *ethhdr,
 547                                 struct batman_packet *batman_packet,
 548                                 unsigned char *hna_buff, int hna_buff_len,
 549                                 struct batman_if *if_incoming)
 550 {
 551         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 552         struct batman_if *batman_if;
 553         struct orig_node *orig_neigh_node, *orig_node;
 554         char has_directlink_flag;
 555         char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 556         char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 557         char is_duplicate;
 558         uint32_t if_incoming_seqno;
 559
 560         /* Silently drop when the batman packet is actually not a
 561          * correct packet.
 562          *
 563          * This might happen if a packet is padded (e.g. Ethernet has a
 564          * minimum frame length of 64 byte) and the aggregation interprets
 565          * it as an additional length.
 566          *
 567          * TODO: A more sane solution would be to have a bit in the
 568          * batman_packet to detect whether the packet is the last
 569          * packet in an aggregation.  Here we expect that the padding
 570          * is always zero (or not 0x01)
 571          */
 572         if (batman_packet->packet_type != BAT_PACKET)
 573                 return;
 574
 575         /* could be changed by schedule_own_packet() */
 576         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 577
 578         has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
 579
 580         is_single_hop_neigh = (compare_orig(ethhdr->h_source,
 581                                             batman_packet->orig) ? 1 : 0);
 582
 583         bat_dbg(DBG_BATMAN, bat_priv,
 584                 "Received BATMAN packet via NB: %pM, IF: %s [%pM] "
 585                 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
 586                 "TTL %d, V %d, IDF %d)\n",
 587                 ethhdr->h_source, if_incoming->net_dev->name,
 588                 if_incoming->net_dev->dev_addr, batman_packet->orig,
 589                 batman_packet->prev_sender, batman_packet->seqno,
 590                 batman_packet->tq, batman_packet->ttl, batman_packet->version,
 591                 has_directlink_flag);
 592
 593         rcu_read_lock();
 594         list_for_each_entry_rcu(batman_if, &if_list, list) {
 595                 if (batman_if->if_status != IF_ACTIVE)
 596                         continue;
 597
 598                 if (batman_if->soft_iface != if_incoming->soft_iface)
 599                         continue;
 600
 601                 if (compare_orig(ethhdr->h_source,
 602                                  batman_if->net_dev->dev_addr))
 603                         is_my_addr = 1;
 604
 605                 if (compare_orig(batman_packet->orig,
 606                                  batman_if->net_dev->dev_addr))
 607                         is_my_orig = 1;
 608
 609                 if (compare_orig(batman_packet->prev_sender,
 610                                  batman_if->net_dev->dev_addr))
 611                         is_my_oldorig = 1;
 612
 613                 if (compare_orig(ethhdr->h_source, broadcast_addr))
 614                         is_broadcast = 1;
 615         }
 616         rcu_read_unlock();
 617
 618         if (batman_packet->version != COMPAT_VERSION) {
 619                 bat_dbg(DBG_BATMAN, bat_priv,
 620                         "Drop packet: incompatible batman version (%i)\n",
 621                         batman_packet->version);
 622                 return;
 623         }
 624
 625         if (is_my_addr) {
 626                 bat_dbg(DBG_BATMAN, bat_priv,
 627                         "Drop packet: received my own broadcast (sender: %pM"
 628                         ")\n",
 629                         ethhdr->h_source);
 630                 return;
 631         }
 632
 633         if (is_broadcast) {
 634                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 635                 "ignoring all packets with broadcast source addr (sender: %pM"
 636                 ")\n", ethhdr->h_source);
 637                 return;
 638         }
 639
 640         if (is_my_orig) {
 641                 unsigned long *word;
 642                 int offset;
 643
 644                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
 645
 646                 if (!orig_neigh_node)
 647                         return;
 648
 649                 /* neighbor has to indicate direct link and it has to
 650                  * come via the corresponding interface */
 651                 /* if received seqno equals last send seqno save new
 652                  * seqno for bidirectional check */
 653                 if (has_directlink_flag &&
 654                     compare_orig(if_incoming->net_dev->dev_addr,
 655                                  batman_packet->orig) &&
 656                     (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
 657                         offset = if_incoming->if_num * NUM_WORDS;
 658                         word = &(orig_neigh_node->bcast_own[offset]);
 659                         bit_mark(word, 0);
 660                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
 661                                 bit_packet_count(word);
 662                 }
 663
 664                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 665                         "originator packet from myself (via neighbor)\n");
 666                 return;
 667         }
 668
 669         if (is_my_oldorig) {
 670                 bat_dbg(DBG_BATMAN, bat_priv,
 671                         "Drop packet: ignoring all rebroadcast echos (sender: "
 672                         "%pM)\n", ethhdr->h_source);
 673                 return;
 674         }
 675
 676         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 677         if (!orig_node)
 678                 return;
 679
 680         is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
 681
 682         if (is_duplicate == -1) {
 683                 bat_dbg(DBG_BATMAN, bat_priv,
 684                         "Drop packet: packet within seqno protection time "
 685                         "(sender: %pM)\n", ethhdr->h_source);
 686                 return;
 687         }
 688
 689         if (batman_packet->tq == 0) {
 690                 bat_dbg(DBG_BATMAN, bat_priv,
 691                         "Drop packet: originator packet with tq equal 0\n");
 692                 return;
 693         }
 694
 695         /* avoid temporary routing loops */
 696         if ((orig_node->router) &&
 697             (orig_node->router->orig_node->router) &&
 698             (compare_orig(orig_node->router->addr,
 699                           batman_packet->prev_sender)) &&
 700             !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
 701             (compare_orig(orig_node->router->addr,
 702                           orig_node->router->orig_node->router->addr))) {
 703                 bat_dbg(DBG_BATMAN, bat_priv,
 704                         "Drop packet: ignoring all rebroadcast packets that "
 705                         "may make me loop (sender: %pM)\n", ethhdr->h_source);
 706                 return;
 707         }
 708
 709         /* if sender is a direct neighbor the sender mac equals
 710          * originator mac */
 711         orig_neigh_node = (is_single_hop_neigh ?
 712                            orig_node :
 713                            get_orig_node(bat_priv, ethhdr->h_source));
 714         if (!orig_neigh_node)
 715                 return;
 716
 717         /* drop packet if sender is not a direct neighbor and if we
 718          * don't route towards it */
 719         if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
 720                 bat_dbg(DBG_BATMAN, bat_priv,
 721                         "Drop packet: OGM via unknown neighbor!\n");
 722                 return;
 723         }
 724
 725         is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
 726                                                 batman_packet, if_incoming);
 727
 728         /* update ranking if it is not a duplicate or has the same
 729          * seqno and similar ttl as the non-duplicate */
 730         if (is_bidirectional &&
 731             (!is_duplicate ||
 732              ((orig_node->last_real_seqno == batman_packet->seqno) &&
 733               (orig_node->last_ttl - 3 <= batman_packet->ttl))))
 734                 update_orig(bat_priv, orig_node, ethhdr, batman_packet,
 735                             if_incoming, hna_buff, hna_buff_len, is_duplicate);
 736
 737         mark_bonding_address(orig_node, orig_neigh_node, batman_packet);
 738         update_bonding_candidates(orig_node);
 739
 740         /* is single hop (direct) neighbor */
 741         if (is_single_hop_neigh) {
 742
 743                 /* mark direct link on incoming interface */
 744                 schedule_forward_packet(orig_node, ethhdr, batman_packet,
 745                                         1, hna_buff_len, if_incoming);
 746
 747                 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
 748                         "rebroadcast neighbor packet with direct link flag\n");
 749                 return;
 750         }
 751
 752         /* multihop originator */
 753         if (!is_bidirectional) {
 754                 bat_dbg(DBG_BATMAN, bat_priv,
 755                         "Drop packet: not received via bidirectional link\n");
 756                 return;
 757         }
 758
 759         if (is_duplicate) {
 760                 bat_dbg(DBG_BATMAN, bat_priv,
 761                         "Drop packet: duplicate packet received\n");
 762                 return;
 763         }
 764
 765         bat_dbg(DBG_BATMAN, bat_priv,
 766                 "Forwarding packet: rebroadcast originator packet\n");
 767         schedule_forward_packet(orig_node, ethhdr, batman_packet,
 768                                 0, hna_buff_len, if_incoming);
 769 }
 770
 771 int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
 772 {
 773         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 774         struct ethhdr *ethhdr;
 775
 776         /* drop packet if it has not necessary minimum size */
 777         if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
 778                 return NET_RX_DROP;
 779
 780         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 781
 782         /* packet with broadcast indication but unicast recipient */
 783         if (!is_broadcast_ether_addr(ethhdr->h_dest))
 784                 return NET_RX_DROP;
 785
 786         /* packet with broadcast sender address */
 787         if (is_broadcast_ether_addr(ethhdr->h_source))
 788                 return NET_RX_DROP;
 789
 790         /* create a copy of the skb, if needed, to modify it. */
 791         if (skb_cow(skb, 0) < 0)
 792                 return NET_RX_DROP;
 793
 794         /* keep skb linear */
 795         if (skb_linearize(skb) < 0)
 796                 return NET_RX_DROP;
 797
 798         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 799
 800         spin_lock_bh(&bat_priv->orig_hash_lock);
 801         receive_aggr_bat_packet(ethhdr,
 802                                 skb->data,
 803                                 skb_headlen(skb),
 804                                 batman_if);
 805         spin_unlock_bh(&bat_priv->orig_hash_lock);
 806
 807         kfree_skb(skb);
 808         return NET_RX_SUCCESS;
 809 }
 810
 811 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
 812                                struct sk_buff *skb, size_t icmp_len)
 813 {
 814         struct orig_node *orig_node;
 815         struct icmp_packet_rr *icmp_packet;
 816         struct batman_if *batman_if;
 817         int ret;
 818         uint8_t dstaddr[ETH_ALEN];
 819
 820         icmp_packet = (struct icmp_packet_rr *)skb->data;
 821
 822         /* add data to device queue */
 823         if (icmp_packet->msg_type != ECHO_REQUEST) {
 824                 bat_socket_receive_packet(icmp_packet, icmp_len);
 825                 return NET_RX_DROP;
 826         }
 827
 828         if (!bat_priv->primary_if)
 829                 return NET_RX_DROP;
 830
 831         /* answer echo request (ping) */
 832         /* get routing information */
 833         spin_lock_bh(&bat_priv->orig_hash_lock);
 834         orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
 835                                                    compare_orig, choose_orig,
 836                                                    icmp_packet->orig));
 837         ret = NET_RX_DROP;
 838
 839         if ((orig_node) && (orig_node->router)) {
 840
 841                 /* don't lock while sending the packets ... we therefore
 842                  * copy the required data before sending */
 843                 batman_if = orig_node->router->if_incoming;
 844                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 845                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 846
 847                 /* create a copy of the skb, if needed, to modify it. */
 848                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 849                         return NET_RX_DROP;
 850
 851                 icmp_packet = (struct icmp_packet_rr *)skb->data;
 852
 853                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 854                 memcpy(icmp_packet->orig,
 855                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 856                 icmp_packet->msg_type = ECHO_REPLY;
 857                 icmp_packet->ttl = TTL;
 858
 859                 send_skb_packet(skb, batman_if, dstaddr);
 860                 ret = NET_RX_SUCCESS;
 861
 862         } else
 863                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 864
 865         return ret;
 866 }
 867
 868 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
 869                                   struct sk_buff *skb)
 870 {
 871         struct orig_node *orig_node;
 872         struct icmp_packet *icmp_packet;
 873         struct batman_if *batman_if;
 874         int ret;
 875         uint8_t dstaddr[ETH_ALEN];
 876
 877         icmp_packet = (struct icmp_packet *)skb->data;
 878
 879         /* send TTL exceeded if packet is an echo request (traceroute) */
 880         if (icmp_packet->msg_type != ECHO_REQUEST) {
 881                 pr_debug("Warning - can't forward icmp packet from %pM to "
 882                          "%pM: ttl exceeded\n", icmp_packet->orig,
 883                          icmp_packet->dst);
 884                 return NET_RX_DROP;
 885         }
 886
 887         if (!bat_priv->primary_if)
 888                 return NET_RX_DROP;
 889
 890         /* get routing information */
 891         spin_lock_bh(&bat_priv->orig_hash_lock);
 892         orig_node = ((struct orig_node *)
 893                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
 894                                icmp_packet->orig));
 895         ret = NET_RX_DROP;
 896
 897         if ((orig_node) && (orig_node->router)) {
 898
 899                 /* don't lock while sending the packets ... we therefore
 900                  * copy the required data before sending */
 901                 batman_if = orig_node->router->if_incoming;
 902                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 903                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 904
 905                 /* create a copy of the skb, if needed, to modify it. */
 906                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 907                         return NET_RX_DROP;
 908
 909                 icmp_packet = (struct icmp_packet *) skb->data;
 910
 911                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 912                 memcpy(icmp_packet->orig,
 913                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 914                 icmp_packet->msg_type = TTL_EXCEEDED;
 915                 icmp_packet->ttl = TTL;
 916
 917                 send_skb_packet(skb, batman_if, dstaddr);
 918                 ret = NET_RX_SUCCESS;
 919
 920         } else
 921                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 922
 923         return ret;
 924 }
 925
 926
 927 int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
 928 {
 929         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
 930         struct icmp_packet_rr *icmp_packet;
 931         struct ethhdr *ethhdr;
 932         struct orig_node *orig_node;
 933         struct batman_if *batman_if;
 934         int hdr_size = sizeof(struct icmp_packet);
 935         int ret;
 936         uint8_t dstaddr[ETH_ALEN];
 937
 938         /**
 939          * we truncate all incoming icmp packets if they don't match our size
 940          */
 941         if (skb->len >= sizeof(struct icmp_packet_rr))
 942                 hdr_size = sizeof(struct icmp_packet_rr);
 943
 944         /* drop packet if it has not necessary minimum size */
 945         if (unlikely(!pskb_may_pull(skb, hdr_size)))
 946                 return NET_RX_DROP;
 947
 948         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 949
 950         /* packet with unicast indication but broadcast recipient */
 951         if (is_broadcast_ether_addr(ethhdr->h_dest))
 952                 return NET_RX_DROP;
 953
 954         /* packet with broadcast sender address */
 955         if (is_broadcast_ether_addr(ethhdr->h_source))
 956                 return NET_RX_DROP;
 957
 958         /* not for me */
 959         if (!is_my_mac(ethhdr->h_dest))
 960                 return NET_RX_DROP;
 961
 962         icmp_packet = (struct icmp_packet_rr *)skb->data;
 963
 964         /* add record route information if not full */
 965         if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
 966             (icmp_packet->rr_cur < BAT_RR_LEN)) {
 967                 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
 968                         ethhdr->h_dest, ETH_ALEN);
 969                 icmp_packet->rr_cur++;
 970         }
 971
 972         /* packet for me */
 973         if (is_my_mac(icmp_packet->dst))
 974                 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
 975
 976         /* TTL exceeded */
 977         if (icmp_packet->ttl < 2)
 978                 return recv_icmp_ttl_exceeded(bat_priv, skb);
 979
 980         ret = NET_RX_DROP;
 981
 982         /* get routing information */
 983         spin_lock_bh(&bat_priv->orig_hash_lock);
 984         orig_node = ((struct orig_node *)
 985                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
 986                                icmp_packet->dst));
 987
 988         if ((orig_node) && (orig_node->router)) {
 989
 990                 /* don't lock while sending the packets ... we therefore
 991                  * copy the required data before sending */
 992                 batman_if = orig_node->router->if_incoming;
 993                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 994                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 995
 996                 /* create a copy of the skb, if needed, to modify it. */
 997                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 998                         return NET_RX_DROP;
 999
1000                 icmp_packet = (struct icmp_packet_rr *)skb->data;
1001
1002                 /* decrement ttl */
1003                 icmp_packet->ttl--;
1004
1005                 /* route it */
1006                 send_skb_packet(skb, batman_if, dstaddr);
1007                 ret = NET_RX_SUCCESS;
1008
1009         } else
1010                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1011
1012         return ret;
1013 }
1014
1015 /* find a suitable router for this originator, and use
1016  * bonding if possible. */
1017 struct neigh_node *find_router(struct bat_priv *bat_priv,
1018                                struct orig_node *orig_node,
1019                                struct batman_if *recv_if)
1020 {
1021         struct orig_node *primary_orig_node;
1022         struct orig_node *router_orig;
1023         struct neigh_node *router, *first_candidate, *best_router;
1024         static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1025         int bonding_enabled;
1026
1027         if (!orig_node)
1028                 return NULL;
1029
1030         if (!orig_node->router)
1031                 return NULL;
1032
1033         /* without bonding, the first node should
1034          * always choose the default router. */
1035
1036         bonding_enabled = atomic_read(&bat_priv->bonding);
1037
1038         if ((!recv_if) && (!bonding_enabled))
1039                 return orig_node->router;
1040
1041         router_orig = orig_node->router->orig_node;
1042
1043         /* if we have something in the primary_addr, we can search
1044          * for a potential bonding candidate. */
1045         if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
1046                 return orig_node->router;
1047
1048         /* find the orig_node which has the primary interface. might
1049          * even be the same as our router_orig in many cases */
1050
1051         if (memcmp(router_orig->primary_addr,
1052                                 router_orig->orig, ETH_ALEN) == 0) {
1053                 primary_orig_node = router_orig;
1054         } else {
1055                 primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig,
1056                                                choose_orig,
1057                                                router_orig->primary_addr);
1058
1059                 if (!primary_orig_node)
1060                         return orig_node->router;
1061         }
1062
1063         /* with less than 2 candidates, we can't do any
1064          * bonding and prefer the original router. */
1065
1066         if (primary_orig_node->bond.candidates < 2)
1067                 return orig_node->router;
1068
1069
1070         /* all nodes between should choose a candidate which
1071          * is is not on the interface where the packet came
1072          * in. */
1073         first_candidate = primary_orig_node->bond.selected;
1074         router = first_candidate;
1075
1076         if (bonding_enabled) {
1077                 /* in the bonding case, send the packets in a round
1078                  * robin fashion over the remaining interfaces. */
1079                 do {
1080                         /* recv_if == NULL on the first node. */
1081                         if (router->if_incoming != recv_if)
1082                                 break;
1083
1084                         router = router->next_bond_candidate;
1085                 } while (router != first_candidate);
1086
1087                 primary_orig_node->bond.selected = router->next_bond_candidate;
1088
1089         } else {
1090                 /* if bonding is disabled, use the best of the
1091                  * remaining candidates which are not using
1092                  * this interface. */
1093                 best_router = first_candidate;
1094
1095                 do {
1096                         /* recv_if == NULL on the first node. */
1097                         if ((router->if_incoming != recv_if) &&
1098                                 (router->tq_avg > best_router->tq_avg))
1099                                         best_router = router;
1100
1101                         router = router->next_bond_candidate;
1102                 } while (router != first_candidate);
1103
1104                 router = best_router;
1105         }
1106
1107         return router;
1108 }
1109
1110 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1111 {
1112         struct ethhdr *ethhdr;
1113
1114         /* drop packet if it has not necessary minimum size */
1115         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1116                 return -1;
1117
1118         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1119
1120         /* packet with unicast indication but broadcast recipient */
1121         if (is_broadcast_ether_addr(ethhdr->h_dest))
1122                 return -1;
1123
1124         /* packet with broadcast sender address */
1125         if (is_broadcast_ether_addr(ethhdr->h_source))
1126                 return -1;
1127
1128         /* not for me */
1129         if (!is_my_mac(ethhdr->h_dest))
1130                 return -1;
1131
1132         return 0;
1133 }
1134
1135 int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
1136                          int hdr_size)
1137 {
1138         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1139         struct orig_node *orig_node;
1140         struct neigh_node *router;
1141         struct batman_if *batman_if;
1142         uint8_t dstaddr[ETH_ALEN];
1143         struct unicast_packet *unicast_packet;
1144         struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
1145         int ret;
1146         struct sk_buff *new_skb;
1147
1148         unicast_packet = (struct unicast_packet *)skb->data;
1149
1150         /* TTL exceeded */
1151         if (unicast_packet->ttl < 2) {
1152                 pr_debug("Warning - can't forward unicast packet from %pM to "
1153                          "%pM: ttl exceeded\n", ethhdr->h_source,
1154                          unicast_packet->dest);
1155                 return NET_RX_DROP;
1156         }
1157
1158         /* get routing information */
1159         spin_lock_bh(&bat_priv->orig_hash_lock);
1160         orig_node = ((struct orig_node *)
1161                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
1162                                unicast_packet->dest));
1163
1164         router = find_router(bat_priv, orig_node, recv_if);
1165
1166         if (!router) {
1167                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1168                 return NET_RX_DROP;
1169         }
1170
1171         /* don't lock while sending the packets ... we therefore
1172          * copy the required data before sending */
1173
1174         batman_if = router->if_incoming;
1175         memcpy(dstaddr, router->addr, ETH_ALEN);
1176
1177         spin_unlock_bh(&bat_priv->orig_hash_lock);
1178
1179         /* create a copy of the skb, if needed, to modify it. */
1180         if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1181                 return NET_RX_DROP;
1182
1183         unicast_packet = (struct unicast_packet *)skb->data;
1184
1185         if (unicast_packet->packet_type == BAT_UNICAST &&
1186             atomic_read(&bat_priv->fragmentation) &&
1187             skb->len > batman_if->net_dev->mtu)
1188                 return frag_send_skb(skb, bat_priv, batman_if,
1189                                      dstaddr);
1190
1191         if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
1192             frag_can_reassemble(skb, batman_if->net_dev->mtu)) {
1193
1194                 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1195
1196                 if (ret == NET_RX_DROP)
1197                         return NET_RX_DROP;
1198
1199                 /* packet was buffered for late merge */
1200                 if (!new_skb)
1201                         return NET_RX_SUCCESS;
1202
1203                 skb = new_skb;
1204                 unicast_packet = (struct unicast_packet *)skb->data;
1205         }
1206
1207         /* decrement ttl */
1208         unicast_packet->ttl--;
1209
1210         /* route it */
1211         send_skb_packet(skb, batman_if, dstaddr);
1212
1213         return NET_RX_SUCCESS;
1214 }
1215
1216 int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1217 {
1218         struct unicast_packet *unicast_packet;
1219         int hdr_size = sizeof(struct unicast_packet);
1220
1221         if (check_unicast_packet(skb, hdr_size) < 0)
1222                 return NET_RX_DROP;
1223
1224         unicast_packet = (struct unicast_packet *)skb->data;
1225
1226         /* packet for me */
1227         if (is_my_mac(unicast_packet->dest)) {
1228                 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1229                 return NET_RX_SUCCESS;
1230         }
1231
1232         return route_unicast_packet(skb, recv_if, hdr_size);
1233 }
1234
1235 int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
1236 {
1237         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1238         struct unicast_frag_packet *unicast_packet;
1239         int hdr_size = sizeof(struct unicast_frag_packet);
1240         struct sk_buff *new_skb = NULL;
1241         int ret;
1242
1243         if (check_unicast_packet(skb, hdr_size) < 0)
1244                 return NET_RX_DROP;
1245
1246         unicast_packet = (struct unicast_frag_packet *)skb->data;
1247
1248         /* packet for me */
1249         if (is_my_mac(unicast_packet->dest)) {
1250
1251                 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1252
1253                 if (ret == NET_RX_DROP)
1254                         return NET_RX_DROP;
1255
1256                 /* packet was buffered for late merge */
1257                 if (!new_skb)
1258                         return NET_RX_SUCCESS;
1259
1260                 interface_rx(recv_if->soft_iface, new_skb, recv_if,
1261                              sizeof(struct unicast_packet));
1262                 return NET_RX_SUCCESS;
1263         }
1264
1265         return route_unicast_packet(skb, recv_if, hdr_size);
1266 }
1267
1268
1269 int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1270 {
1271         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1272         struct orig_node *orig_node;
1273         struct bcast_packet *bcast_packet;
1274         struct ethhdr *ethhdr;
1275         int hdr_size = sizeof(struct bcast_packet);
1276         int32_t seq_diff;
1277
1278         /* drop packet if it has not necessary minimum size */
1279         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1280                 return NET_RX_DROP;
1281
1282         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1283
1284         /* packet with broadcast indication but unicast recipient */
1285         if (!is_broadcast_ether_addr(ethhdr->h_dest))
1286                 return NET_RX_DROP;
1287
1288         /* packet with broadcast sender address */
1289         if (is_broadcast_ether_addr(ethhdr->h_source))
1290                 return NET_RX_DROP;
1291
1292         /* ignore broadcasts sent by myself */
1293         if (is_my_mac(ethhdr->h_source))
1294                 return NET_RX_DROP;
1295
1296         bcast_packet = (struct bcast_packet *)skb->data;
1297
1298         /* ignore broadcasts originated by myself */
1299         if (is_my_mac(bcast_packet->orig))
1300                 return NET_RX_DROP;
1301
1302         if (bcast_packet->ttl < 2)
1303                 return NET_RX_DROP;
1304
1305         spin_lock_bh(&bat_priv->orig_hash_lock);
1306         orig_node = ((struct orig_node *)
1307                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
1308                                bcast_packet->orig));
1309
1310         if (!orig_node) {
1311                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1312                 return NET_RX_DROP;
1313         }
1314
1315         /* check whether the packet is a duplicate */
1316         if (get_bit_status(orig_node->bcast_bits,
1317                            orig_node->last_bcast_seqno,
1318                            ntohl(bcast_packet->seqno))) {
1319                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1320                 return NET_RX_DROP;
1321         }
1322
1323         seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1324
1325         /* check whether the packet is old and the host just restarted. */
1326         if (window_protected(bat_priv, seq_diff,
1327                              &orig_node->bcast_seqno_reset)) {
1328                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1329                 return NET_RX_DROP;
1330         }
1331
1332         /* mark broadcast in flood history, update window position
1333          * if required. */
1334         if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1335                 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1336
1337         spin_unlock_bh(&bat_priv->orig_hash_lock);
1338         /* rebroadcast packet */
1339         add_bcast_packet_to_list(bat_priv, skb);
1340
1341         /* broadcast for me */
1342         interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1343
1344         return NET_RX_SUCCESS;
1345 }
1346
1347 int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if)
1348 {
1349         struct vis_packet *vis_packet;
1350         struct ethhdr *ethhdr;
1351         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1352         int hdr_size = sizeof(struct vis_packet);
1353
1354         /* keep skb linear */
1355         if (skb_linearize(skb) < 0)
1356                 return NET_RX_DROP;
1357
1358         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1359                 return NET_RX_DROP;
1360
1361         vis_packet = (struct vis_packet *)skb->data;
1362         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1363
1364         /* not for me */
1365         if (!is_my_mac(ethhdr->h_dest))
1366                 return NET_RX_DROP;
1367
1368         /* ignore own packets */
1369         if (is_my_mac(vis_packet->vis_orig))
1370                 return NET_RX_DROP;
1371
1372         if (is_my_mac(vis_packet->sender_orig))
1373                 return NET_RX_DROP;
1374
1375         switch (vis_packet->vis_type) {
1376         case VIS_TYPE_SERVER_SYNC:
1377                 receive_server_sync_packet(bat_priv, vis_packet,
1378                                            skb_headlen(skb));
1379                 break;
1380
1381         case VIS_TYPE_CLIENT_UPDATE:
1382                 receive_client_update_packet(bat_priv, vis_packet,
1383                                              skb_headlen(skb));
1384                 break;
1385
1386         default:        /* ignore unknown packet */
1387                 break;
1388         }
1389
1390         /* We take a copy of the data in the packet, so we should
1391            always free the skbuf. */
1392         return NET_RX_DROP;
1393 }