net/batman-adv/routing.c

   1 /*
   2  * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "routing.h"
  24 #include "send.h"
  25 #include "hash.h"
  26 #include "soft-interface.h"
  27 #include "hard-interface.h"
  28 #include "icmp_socket.h"
  29 #include "translation-table.h"
  30 #include "originator.h"
  31 #include "types.h"
  32 #include "ring_buffer.h"
  33 #include "vis.h"
  34 #include "aggregation.h"
  35 #include "gateway_common.h"
  36 #include "gateway_client.h"
  37 #include "unicast.h"
  38
  39 void slide_own_bcast_window(struct batman_if *batman_if)
  40 {
  41         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
  42         struct hashtable_t *hash = bat_priv->orig_hash;
  43         struct hlist_node *walk;
  44         struct hlist_head *head;
  45         struct element_t *bucket;
  46         struct orig_node *orig_node;
  47         unsigned long *word;
  48         int i;
  49         size_t word_index;
  50
  51         spin_lock_bh(&bat_priv->orig_hash_lock);
  52
  53         for (i = 0; i < hash->size; i++) {
  54                 head = &hash->table[i];
  55
  56                 hlist_for_each_entry(bucket, walk, head, hlist) {
  57                         orig_node = bucket->data;
  58                         word_index = batman_if->if_num * NUM_WORDS;
  59                         word = &(orig_node->bcast_own[word_index]);
  60
  61                         bit_get_packet(bat_priv, word, 1, 0);
  62                         orig_node->bcast_own_sum[batman_if->if_num] =
  63                                 bit_packet_count(word);
  64                 }
  65         }
  66
  67         spin_unlock_bh(&bat_priv->orig_hash_lock);
  68 }
  69
  70 static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node,
  71                        unsigned char *hna_buff, int hna_buff_len)
  72 {
  73         if ((hna_buff_len != orig_node->hna_buff_len) ||
  74             ((hna_buff_len > 0) &&
  75              (orig_node->hna_buff_len > 0) &&
  76              (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
  77
  78                 if (orig_node->hna_buff_len > 0)
  79                         hna_global_del_orig(bat_priv, orig_node,
  80                                             "originator changed hna");
  81
  82                 if ((hna_buff_len > 0) && (hna_buff))
  83                         hna_global_add_orig(bat_priv, orig_node,
  84                                             hna_buff, hna_buff_len);
  85         }
  86 }
  87
  88 static void update_route(struct bat_priv *bat_priv,
  89                          struct orig_node *orig_node,
  90                          struct neigh_node *neigh_node,
  91                          unsigned char *hna_buff, int hna_buff_len)
  92 {
  93         /* route deleted */
  94         if ((orig_node->router) && (!neigh_node)) {
  95
  96                 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
  97                         orig_node->orig);
  98                 hna_global_del_orig(bat_priv, orig_node,
  99                                     "originator timed out");
 100
 101                 /* route added */
 102         } else if ((!orig_node->router) && (neigh_node)) {
 103
 104                 bat_dbg(DBG_ROUTES, bat_priv,
 105                         "Adding route towards: %pM (via %pM)\n",
 106                         orig_node->orig, neigh_node->addr);
 107                 hna_global_add_orig(bat_priv, orig_node,
 108                                     hna_buff, hna_buff_len);
 109
 110                 /* route changed */
 111         } else {
 112                 bat_dbg(DBG_ROUTES, bat_priv,
 113                         "Changing route towards: %pM "
 114                         "(now via %pM - was via %pM)\n",
 115                         orig_node->orig, neigh_node->addr,
 116                         orig_node->router->addr);
 117         }
 118
 119         orig_node->router = neigh_node;
 120 }
 121
 122
 123 void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
 124                    struct neigh_node *neigh_node, unsigned char *hna_buff,
 125                    int hna_buff_len)
 126 {
 127
 128         if (!orig_node)
 129                 return;
 130
 131         if (orig_node->router != neigh_node)
 132                 update_route(bat_priv, orig_node, neigh_node,
 133                              hna_buff, hna_buff_len);
 134         /* may be just HNA changed */
 135         else
 136                 update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
 137 }
 138
 139 static int is_bidirectional_neigh(struct orig_node *orig_node,
 140                                 struct orig_node *orig_neigh_node,
 141                                 struct batman_packet *batman_packet,
 142                                 struct batman_if *if_incoming)
 143 {
 144         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 145         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 146         unsigned char total_count;
 147
 148         if (orig_node == orig_neigh_node) {
 149                 list_for_each_entry(tmp_neigh_node,
 150                                     &orig_node->neigh_list,
 151                                     list) {
 152
 153                         if (compare_orig(tmp_neigh_node->addr,
 154                                          orig_neigh_node->orig) &&
 155                             (tmp_neigh_node->if_incoming == if_incoming))
 156                                 neigh_node = tmp_neigh_node;
 157                 }
 158
 159                 if (!neigh_node)
 160                         neigh_node = create_neighbor(orig_node,
 161                                                      orig_neigh_node,
 162                                                      orig_neigh_node->orig,
 163                                                      if_incoming);
 164                 /* create_neighbor failed, return 0 */
 165                 if (!neigh_node)
 166                         return 0;
 167
 168                 neigh_node->last_valid = jiffies;
 169         } else {
 170                 /* find packet count of corresponding one hop neighbor */
 171                 list_for_each_entry(tmp_neigh_node,
 172                                     &orig_neigh_node->neigh_list, list) {
 173
 174                         if (compare_orig(tmp_neigh_node->addr,
 175                                          orig_neigh_node->orig) &&
 176                             (tmp_neigh_node->if_incoming == if_incoming))
 177                                 neigh_node = tmp_neigh_node;
 178                 }
 179
 180                 if (!neigh_node)
 181                         neigh_node = create_neighbor(orig_neigh_node,
 182                                                      orig_neigh_node,
 183                                                      orig_neigh_node->orig,
 184                                                      if_incoming);
 185                 /* create_neighbor failed, return 0 */
 186                 if (!neigh_node)
 187                         return 0;
 188         }
 189
 190         orig_node->last_valid = jiffies;
 191
 192         /* pay attention to not get a value bigger than 100 % */
 193         total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
 194                        neigh_node->real_packet_count ?
 195                        neigh_node->real_packet_count :
 196                        orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
 197
 198         /* if we have too few packets (too less data) we set tq_own to zero */
 199         /* if we receive too few packets it is not considered bidirectional */
 200         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 201             (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 202                 orig_neigh_node->tq_own = 0;
 203         else
 204                 /* neigh_node->real_packet_count is never zero as we
 205                  * only purge old information when getting new
 206                  * information */
 207                 orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
 208                         neigh_node->real_packet_count;
 209
 210         /*
 211          * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 212          * affect the nearly-symmetric links only a little, but
 213          * punishes asymmetric links more.  This will give a value
 214          * between 0 and TQ_MAX_VALUE
 215          */
 216         orig_neigh_node->tq_asym_penalty =
 217                 TQ_MAX_VALUE -
 218                 (TQ_MAX_VALUE *
 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 - neigh_node->real_packet_count)) /
 222                 (TQ_LOCAL_WINDOW_SIZE *
 223                  TQ_LOCAL_WINDOW_SIZE *
 224                  TQ_LOCAL_WINDOW_SIZE);
 225
 226         batman_packet->tq = ((batman_packet->tq *
 227                               orig_neigh_node->tq_own *
 228                               orig_neigh_node->tq_asym_penalty) /
 229                              (TQ_MAX_VALUE * TQ_MAX_VALUE));
 230
 231         bat_dbg(DBG_BATMAN, bat_priv,
 232                 "bidirectional: "
 233                 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
 234                 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
 235                 "total tq: %3i\n",
 236                 orig_node->orig, orig_neigh_node->orig, total_count,
 237                 neigh_node->real_packet_count, orig_neigh_node->tq_own,
 238                 orig_neigh_node->tq_asym_penalty, batman_packet->tq);
 239
 240         /* if link has the minimum required transmission quality
 241          * consider it bidirectional */
 242         if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 243                 return 1;
 244
 245         return 0;
 246 }
 247
 248 static void update_orig(struct bat_priv *bat_priv,
 249                         struct orig_node *orig_node,
 250                         struct ethhdr *ethhdr,
 251                         struct batman_packet *batman_packet,
 252                         struct batman_if *if_incoming,
 253                         unsigned char *hna_buff, int hna_buff_len,
 254                         char is_duplicate)
 255 {
 256         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 257         int tmp_hna_buff_len;
 258
 259         bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
 260                 "Searching and updating originator entry of received packet\n");
 261
 262         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 263                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 264                     (tmp_neigh_node->if_incoming == if_incoming)) {
 265                         neigh_node = tmp_neigh_node;
 266                         continue;
 267                 }
 268
 269                 if (is_duplicate)
 270                         continue;
 271
 272                 ring_buffer_set(tmp_neigh_node->tq_recv,
 273                                 &tmp_neigh_node->tq_index, 0);
 274                 tmp_neigh_node->tq_avg =
 275                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 276         }
 277
 278         if (!neigh_node) {
 279                 struct orig_node *orig_tmp;
 280
 281                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 282                 if (!orig_tmp)
 283                         return;
 284
 285                 neigh_node = create_neighbor(orig_node, orig_tmp,
 286                                              ethhdr->h_source, if_incoming);
 287                 if (!neigh_node)
 288                         return;
 289         } else
 290                 bat_dbg(DBG_BATMAN, bat_priv,
 291                         "Updating existing last-hop neighbor of originator\n");
 292
 293         orig_node->flags = batman_packet->flags;
 294         neigh_node->last_valid = jiffies;
 295
 296         ring_buffer_set(neigh_node->tq_recv,
 297                         &neigh_node->tq_index,
 298                         batman_packet->tq);
 299         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 300
 301         if (!is_duplicate) {
 302                 orig_node->last_ttl = batman_packet->ttl;
 303                 neigh_node->last_ttl = batman_packet->ttl;
 304         }
 305
 306         tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
 307                             batman_packet->num_hna * ETH_ALEN : hna_buff_len);
 308
 309         /* if this neighbor already is our next hop there is nothing
 310          * to change */
 311         if (orig_node->router == neigh_node)
 312                 goto update_hna;
 313
 314         /* if this neighbor does not offer a better TQ we won't consider it */
 315         if ((orig_node->router) &&
 316             (orig_node->router->tq_avg > neigh_node->tq_avg))
 317                 goto update_hna;
 318
 319         /* if the TQ is the same and the link not more symetric we
 320          * won't consider it either */
 321         if ((orig_node->router) &&
 322              ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
 323              (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
 324               >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
 325                 goto update_hna;
 326
 327         update_routes(bat_priv, orig_node, neigh_node,
 328                       hna_buff, tmp_hna_buff_len);
 329         goto update_gw;
 330
 331 update_hna:
 332         update_routes(bat_priv, orig_node, orig_node->router,
 333                       hna_buff, tmp_hna_buff_len);
 334
 335 update_gw:
 336         if (orig_node->gw_flags != batman_packet->gw_flags)
 337                 gw_node_update(bat_priv, orig_node, batman_packet->gw_flags);
 338
 339         orig_node->gw_flags = batman_packet->gw_flags;
 340
 341         /* restart gateway selection if fast or late switching was enabled */
 342         if ((orig_node->gw_flags) &&
 343             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 344             (atomic_read(&bat_priv->gw_sel_class) > 2))
 345                 gw_check_election(bat_priv, orig_node);
 346 }
 347
 348 /* checks whether the host restarted and is in the protection time.
 349  * returns:
 350  *  0 if the packet is to be accepted
 351  *  1 if the packet is to be ignored.
 352  */
 353 static int window_protected(struct bat_priv *bat_priv,
 354                             int32_t seq_num_diff,
 355                             unsigned long *last_reset)
 356 {
 357         if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
 358                 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
 359                 if (time_after(jiffies, *last_reset +
 360                         msecs_to_jiffies(RESET_PROTECTION_MS))) {
 361
 362                         *last_reset = jiffies;
 363                         bat_dbg(DBG_BATMAN, bat_priv,
 364                                 "old packet received, start protection\n");
 365
 366                         return 0;
 367                 } else
 368                         return 1;
 369         }
 370         return 0;
 371 }
 372
 373 /* processes a batman packet for all interfaces, adjusts the sequence number and
 374  * finds out whether it is a duplicate.
 375  * returns:
 376  *   1 the packet is a duplicate
 377  *   0 the packet has not yet been received
 378  *  -1 the packet is old and has been received while the seqno window
 379  *     was protected. Caller should drop it.
 380  */
 381 static char count_real_packets(struct ethhdr *ethhdr,
 382                                struct batman_packet *batman_packet,
 383                                struct batman_if *if_incoming)
 384 {
 385         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 386         struct orig_node *orig_node;
 387         struct neigh_node *tmp_neigh_node;
 388         char is_duplicate = 0;
 389         int32_t seq_diff;
 390         int need_update = 0;
 391         int set_mark;
 392
 393         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 394         if (!orig_node)
 395                 return 0;
 396
 397         seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
 398
 399         /* signalize caller that the packet is to be dropped. */
 400         if (window_protected(bat_priv, seq_diff,
 401                              &orig_node->batman_seqno_reset))
 402                 return -1;
 403
 404         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 405
 406                 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
 407                                                orig_node->last_real_seqno,
 408                                                batman_packet->seqno);
 409
 410                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 411                     (tmp_neigh_node->if_incoming == if_incoming))
 412                         set_mark = 1;
 413                 else
 414                         set_mark = 0;
 415
 416                 /* if the window moved, set the update flag. */
 417                 need_update |= bit_get_packet(bat_priv,
 418                                               tmp_neigh_node->real_bits,
 419                                               seq_diff, set_mark);
 420
 421                 tmp_neigh_node->real_packet_count =
 422                         bit_packet_count(tmp_neigh_node->real_bits);
 423         }
 424
 425         if (need_update) {
 426                 bat_dbg(DBG_BATMAN, bat_priv,
 427                         "updating last_seqno: old %d, new %d\n",
 428                         orig_node->last_real_seqno, batman_packet->seqno);
 429                 orig_node->last_real_seqno = batman_packet->seqno;
 430         }
 431
 432         return is_duplicate;
 433 }
 434
 435 /* copy primary address for bonding */
 436 static void mark_bonding_address(struct orig_node *orig_node,
 437                                  struct orig_node *orig_neigh_node,
 438                                  struct batman_packet *batman_packet)
 439
 440 {
 441         if (batman_packet->flags & PRIMARIES_FIRST_HOP)
 442                 memcpy(orig_neigh_node->primary_addr,
 443                        orig_node->orig, ETH_ALEN);
 444
 445         return;
 446 }
 447
 448 /* mark possible bond.candidates in the neighbor list */
 449 void update_bonding_candidates(struct orig_node *orig_node)
 450 {
 451         int candidates;
 452         int interference_candidate;
 453         int best_tq;
 454         struct neigh_node *tmp_neigh_node, *tmp_neigh_node2;
 455         struct neigh_node *first_candidate, *last_candidate;
 456
 457         /* update the candidates for this originator */
 458         if (!orig_node->router) {
 459                 orig_node->bond.candidates = 0;
 460                 return;
 461         }
 462
 463         best_tq = orig_node->router->tq_avg;
 464
 465         /* update bond.candidates */
 466
 467         candidates = 0;
 468
 469         /* mark other nodes which also received "PRIMARIES FIRST HOP" packets
 470          * as "bonding partner" */
 471
 472         /* first, zero the list */
 473         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 474                 tmp_neigh_node->next_bond_candidate = NULL;
 475         }
 476
 477         first_candidate = NULL;
 478         last_candidate = NULL;
 479         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 480
 481                 /* only consider if it has the same primary address ...  */
 482                 if (memcmp(orig_node->orig,
 483                                 tmp_neigh_node->orig_node->primary_addr,
 484                                 ETH_ALEN) != 0)
 485                         continue;
 486
 487                 /* ... and is good enough to be considered */
 488                 if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
 489                         continue;
 490
 491                 /* check if we have another candidate with the same
 492                  * mac address or interface. If we do, we won't
 493                  * select this candidate because of possible interference. */
 494
 495                 interference_candidate = 0;
 496                 list_for_each_entry(tmp_neigh_node2,
 497                                 &orig_node->neigh_list, list) {
 498
 499                         if (tmp_neigh_node2 == tmp_neigh_node)
 500                                 continue;
 501
 502                         /* we only care if the other candidate is even
 503                          * considered as candidate. */
 504                         if (!tmp_neigh_node2->next_bond_candidate)
 505                                 continue;
 506
 507
 508                         if ((tmp_neigh_node->if_incoming ==
 509                                 tmp_neigh_node2->if_incoming)
 510                                 || (memcmp(tmp_neigh_node->addr,
 511                                 tmp_neigh_node2->addr, ETH_ALEN) == 0)) {
 512
 513                                 interference_candidate = 1;
 514                                 break;
 515                         }
 516                 }
 517                 /* don't care further if it is an interference candidate */
 518                 if (interference_candidate)
 519                         continue;
 520
 521                 if (!first_candidate) {
 522                         first_candidate = tmp_neigh_node;
 523                         tmp_neigh_node->next_bond_candidate = first_candidate;
 524                 } else
 525                         tmp_neigh_node->next_bond_candidate = last_candidate;
 526
 527                 last_candidate = tmp_neigh_node;
 528
 529                 candidates++;
 530         }
 531
 532         if (candidates > 0) {
 533                 first_candidate->next_bond_candidate = last_candidate;
 534                 orig_node->bond.selected = first_candidate;
 535         }
 536
 537         orig_node->bond.candidates = candidates;
 538 }
 539
 540 void receive_bat_packet(struct ethhdr *ethhdr,
 541                                 struct batman_packet *batman_packet,
 542                                 unsigned char *hna_buff, int hna_buff_len,
 543                                 struct batman_if *if_incoming)
 544 {
 545         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 546         struct batman_if *batman_if;
 547         struct orig_node *orig_neigh_node, *orig_node;
 548         char has_directlink_flag;
 549         char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 550         char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 551         char is_duplicate;
 552         uint32_t if_incoming_seqno;
 553
 554         /* Silently drop when the batman packet is actually not a
 555          * correct packet.
 556          *
 557          * This might happen if a packet is padded (e.g. Ethernet has a
 558          * minimum frame length of 64 byte) and the aggregation interprets
 559          * it as an additional length.
 560          *
 561          * TODO: A more sane solution would be to have a bit in the
 562          * batman_packet to detect whether the packet is the last
 563          * packet in an aggregation.  Here we expect that the padding
 564          * is always zero (or not 0x01)
 565          */
 566         if (batman_packet->packet_type != BAT_PACKET)
 567                 return;
 568
 569         /* could be changed by schedule_own_packet() */
 570         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 571
 572         has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
 573
 574         is_single_hop_neigh = (compare_orig(ethhdr->h_source,
 575                                             batman_packet->orig) ? 1 : 0);
 576
 577         bat_dbg(DBG_BATMAN, bat_priv,
 578                 "Received BATMAN packet via NB: %pM, IF: %s [%pM] "
 579                 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
 580                 "TTL %d, V %d, IDF %d)\n",
 581                 ethhdr->h_source, if_incoming->net_dev->name,
 582                 if_incoming->net_dev->dev_addr, batman_packet->orig,
 583                 batman_packet->prev_sender, batman_packet->seqno,
 584                 batman_packet->tq, batman_packet->ttl, batman_packet->version,
 585                 has_directlink_flag);
 586
 587         rcu_read_lock();
 588         list_for_each_entry_rcu(batman_if, &if_list, list) {
 589                 if (batman_if->if_status != IF_ACTIVE)
 590                         continue;
 591
 592                 if (batman_if->soft_iface != if_incoming->soft_iface)
 593                         continue;
 594
 595                 if (compare_orig(ethhdr->h_source,
 596                                  batman_if->net_dev->dev_addr))
 597                         is_my_addr = 1;
 598
 599                 if (compare_orig(batman_packet->orig,
 600                                  batman_if->net_dev->dev_addr))
 601                         is_my_orig = 1;
 602
 603                 if (compare_orig(batman_packet->prev_sender,
 604                                  batman_if->net_dev->dev_addr))
 605                         is_my_oldorig = 1;
 606
 607                 if (compare_orig(ethhdr->h_source, broadcast_addr))
 608                         is_broadcast = 1;
 609         }
 610         rcu_read_unlock();
 611
 612         if (batman_packet->version != COMPAT_VERSION) {
 613                 bat_dbg(DBG_BATMAN, bat_priv,
 614                         "Drop packet: incompatible batman version (%i)\n",
 615                         batman_packet->version);
 616                 return;
 617         }
 618
 619         if (is_my_addr) {
 620                 bat_dbg(DBG_BATMAN, bat_priv,
 621                         "Drop packet: received my own broadcast (sender: %pM"
 622                         ")\n",
 623                         ethhdr->h_source);
 624                 return;
 625         }
 626
 627         if (is_broadcast) {
 628                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 629                 "ignoring all packets with broadcast source addr (sender: %pM"
 630                 ")\n", ethhdr->h_source);
 631                 return;
 632         }
 633
 634         if (is_my_orig) {
 635                 unsigned long *word;
 636                 int offset;
 637
 638                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
 639
 640                 if (!orig_neigh_node)
 641                         return;
 642
 643                 /* neighbor has to indicate direct link and it has to
 644                  * come via the corresponding interface */
 645                 /* if received seqno equals last send seqno save new
 646                  * seqno for bidirectional check */
 647                 if (has_directlink_flag &&
 648                     compare_orig(if_incoming->net_dev->dev_addr,
 649                                  batman_packet->orig) &&
 650                     (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
 651                         offset = if_incoming->if_num * NUM_WORDS;
 652                         word = &(orig_neigh_node->bcast_own[offset]);
 653                         bit_mark(word, 0);
 654                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
 655                                 bit_packet_count(word);
 656                 }
 657
 658                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 659                         "originator packet from myself (via neighbor)\n");
 660                 return;
 661         }
 662
 663         if (is_my_oldorig) {
 664                 bat_dbg(DBG_BATMAN, bat_priv,
 665                         "Drop packet: ignoring all rebroadcast echos (sender: "
 666                         "%pM)\n", ethhdr->h_source);
 667                 return;
 668         }
 669
 670         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 671         if (!orig_node)
 672                 return;
 673
 674         is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
 675
 676         if (is_duplicate == -1) {
 677                 bat_dbg(DBG_BATMAN, bat_priv,
 678                         "Drop packet: packet within seqno protection time "
 679                         "(sender: %pM)\n", ethhdr->h_source);
 680                 return;
 681         }
 682
 683         if (batman_packet->tq == 0) {
 684                 bat_dbg(DBG_BATMAN, bat_priv,
 685                         "Drop packet: originator packet with tq equal 0\n");
 686                 return;
 687         }
 688
 689         /* avoid temporary routing loops */
 690         if ((orig_node->router) &&
 691             (orig_node->router->orig_node->router) &&
 692             (compare_orig(orig_node->router->addr,
 693                           batman_packet->prev_sender)) &&
 694             !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
 695             (compare_orig(orig_node->router->addr,
 696                           orig_node->router->orig_node->router->addr))) {
 697                 bat_dbg(DBG_BATMAN, bat_priv,
 698                         "Drop packet: ignoring all rebroadcast packets that "
 699                         "may make me loop (sender: %pM)\n", ethhdr->h_source);
 700                 return;
 701         }
 702
 703         /* if sender is a direct neighbor the sender mac equals
 704          * originator mac */
 705         orig_neigh_node = (is_single_hop_neigh ?
 706                            orig_node :
 707                            get_orig_node(bat_priv, ethhdr->h_source));
 708         if (!orig_neigh_node)
 709                 return;
 710
 711         /* drop packet if sender is not a direct neighbor and if we
 712          * don't route towards it */
 713         if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
 714                 bat_dbg(DBG_BATMAN, bat_priv,
 715                         "Drop packet: OGM via unknown neighbor!\n");
 716                 return;
 717         }
 718
 719         is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
 720                                                 batman_packet, if_incoming);
 721
 722         /* update ranking if it is not a duplicate or has the same
 723          * seqno and similar ttl as the non-duplicate */
 724         if (is_bidirectional &&
 725             (!is_duplicate ||
 726              ((orig_node->last_real_seqno == batman_packet->seqno) &&
 727               (orig_node->last_ttl - 3 <= batman_packet->ttl))))
 728                 update_orig(bat_priv, orig_node, ethhdr, batman_packet,
 729                             if_incoming, hna_buff, hna_buff_len, is_duplicate);
 730
 731         mark_bonding_address(orig_node, orig_neigh_node, batman_packet);
 732         update_bonding_candidates(orig_node);
 733
 734         /* is single hop (direct) neighbor */
 735         if (is_single_hop_neigh) {
 736
 737                 /* mark direct link on incoming interface */
 738                 schedule_forward_packet(orig_node, ethhdr, batman_packet,
 739                                         1, hna_buff_len, if_incoming);
 740
 741                 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
 742                         "rebroadcast neighbor packet with direct link flag\n");
 743                 return;
 744         }
 745
 746         /* multihop originator */
 747         if (!is_bidirectional) {
 748                 bat_dbg(DBG_BATMAN, bat_priv,
 749                         "Drop packet: not received via bidirectional link\n");
 750                 return;
 751         }
 752
 753         if (is_duplicate) {
 754                 bat_dbg(DBG_BATMAN, bat_priv,
 755                         "Drop packet: duplicate packet received\n");
 756                 return;
 757         }
 758
 759         bat_dbg(DBG_BATMAN, bat_priv,
 760                 "Forwarding packet: rebroadcast originator packet\n");
 761         schedule_forward_packet(orig_node, ethhdr, batman_packet,
 762                                 0, hna_buff_len, if_incoming);
 763 }
 764
 765 int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
 766 {
 767         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 768         struct ethhdr *ethhdr;
 769
 770         /* drop packet if it has not necessary minimum size */
 771         if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
 772                 return NET_RX_DROP;
 773
 774         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 775
 776         /* packet with broadcast indication but unicast recipient */
 777         if (!is_broadcast_ether_addr(ethhdr->h_dest))
 778                 return NET_RX_DROP;
 779
 780         /* packet with broadcast sender address */
 781         if (is_broadcast_ether_addr(ethhdr->h_source))
 782                 return NET_RX_DROP;
 783
 784         /* create a copy of the skb, if needed, to modify it. */
 785         if (skb_cow(skb, 0) < 0)
 786                 return NET_RX_DROP;
 787
 788         /* keep skb linear */
 789         if (skb_linearize(skb) < 0)
 790                 return NET_RX_DROP;
 791
 792         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 793
 794         spin_lock_bh(&bat_priv->orig_hash_lock);
 795         receive_aggr_bat_packet(ethhdr,
 796                                 skb->data,
 797                                 skb_headlen(skb),
 798                                 batman_if);
 799         spin_unlock_bh(&bat_priv->orig_hash_lock);
 800
 801         kfree_skb(skb);
 802         return NET_RX_SUCCESS;
 803 }
 804
 805 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
 806                                struct sk_buff *skb, size_t icmp_len)
 807 {
 808         struct orig_node *orig_node;
 809         struct icmp_packet_rr *icmp_packet;
 810         struct batman_if *batman_if;
 811         int ret;
 812         uint8_t dstaddr[ETH_ALEN];
 813
 814         icmp_packet = (struct icmp_packet_rr *)skb->data;
 815
 816         /* add data to device queue */
 817         if (icmp_packet->msg_type != ECHO_REQUEST) {
 818                 bat_socket_receive_packet(icmp_packet, icmp_len);
 819                 return NET_RX_DROP;
 820         }
 821
 822         if (!bat_priv->primary_if)
 823                 return NET_RX_DROP;
 824
 825         /* answer echo request (ping) */
 826         /* get routing information */
 827         spin_lock_bh(&bat_priv->orig_hash_lock);
 828         orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
 829                                                    compare_orig, choose_orig,
 830                                                    icmp_packet->orig));
 831         ret = NET_RX_DROP;
 832
 833         if ((orig_node) && (orig_node->router)) {
 834
 835                 /* don't lock while sending the packets ... we therefore
 836                  * copy the required data before sending */
 837                 batman_if = orig_node->router->if_incoming;
 838                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 839                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 840
 841                 /* create a copy of the skb, if needed, to modify it. */
 842                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 843                         return NET_RX_DROP;
 844
 845                 icmp_packet = (struct icmp_packet_rr *)skb->data;
 846
 847                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 848                 memcpy(icmp_packet->orig,
 849                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 850                 icmp_packet->msg_type = ECHO_REPLY;
 851                 icmp_packet->ttl = TTL;
 852
 853                 send_skb_packet(skb, batman_if, dstaddr);
 854                 ret = NET_RX_SUCCESS;
 855
 856         } else
 857                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 858
 859         return ret;
 860 }
 861
 862 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
 863                                   struct sk_buff *skb)
 864 {
 865         struct orig_node *orig_node;
 866         struct icmp_packet *icmp_packet;
 867         struct batman_if *batman_if;
 868         int ret;
 869         uint8_t dstaddr[ETH_ALEN];
 870
 871         icmp_packet = (struct icmp_packet *)skb->data;
 872
 873         /* send TTL exceeded if packet is an echo request (traceroute) */
 874         if (icmp_packet->msg_type != ECHO_REQUEST) {
 875                 pr_debug("Warning - can't forward icmp packet from %pM to "
 876                          "%pM: ttl exceeded\n", icmp_packet->orig,
 877                          icmp_packet->dst);
 878                 return NET_RX_DROP;
 879         }
 880
 881         if (!bat_priv->primary_if)
 882                 return NET_RX_DROP;
 883
 884         /* get routing information */
 885         spin_lock_bh(&bat_priv->orig_hash_lock);
 886         orig_node = ((struct orig_node *)
 887                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
 888                                icmp_packet->orig));
 889         ret = NET_RX_DROP;
 890
 891         if ((orig_node) && (orig_node->router)) {
 892
 893                 /* don't lock while sending the packets ... we therefore
 894                  * copy the required data before sending */
 895                 batman_if = orig_node->router->if_incoming;
 896                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 897                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 898
 899                 /* create a copy of the skb, if needed, to modify it. */
 900                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 901                         return NET_RX_DROP;
 902
 903                 icmp_packet = (struct icmp_packet *) skb->data;
 904
 905                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 906                 memcpy(icmp_packet->orig,
 907                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 908                 icmp_packet->msg_type = TTL_EXCEEDED;
 909                 icmp_packet->ttl = TTL;
 910
 911                 send_skb_packet(skb, batman_if, dstaddr);
 912                 ret = NET_RX_SUCCESS;
 913
 914         } else
 915                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 916
 917         return ret;
 918 }
 919
 920
 921 int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
 922 {
 923         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
 924         struct icmp_packet_rr *icmp_packet;
 925         struct ethhdr *ethhdr;
 926         struct orig_node *orig_node;
 927         struct batman_if *batman_if;
 928         int hdr_size = sizeof(struct icmp_packet);
 929         int ret;
 930         uint8_t dstaddr[ETH_ALEN];
 931
 932         /**
 933          * we truncate all incoming icmp packets if they don't match our size
 934          */
 935         if (skb->len >= sizeof(struct icmp_packet_rr))
 936                 hdr_size = sizeof(struct icmp_packet_rr);
 937
 938         /* drop packet if it has not necessary minimum size */
 939         if (unlikely(!pskb_may_pull(skb, hdr_size)))
 940                 return NET_RX_DROP;
 941
 942         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 943
 944         /* packet with unicast indication but broadcast recipient */
 945         if (is_broadcast_ether_addr(ethhdr->h_dest))
 946                 return NET_RX_DROP;
 947
 948         /* packet with broadcast sender address */
 949         if (is_broadcast_ether_addr(ethhdr->h_source))
 950                 return NET_RX_DROP;
 951
 952         /* not for me */
 953         if (!is_my_mac(ethhdr->h_dest))
 954                 return NET_RX_DROP;
 955
 956         icmp_packet = (struct icmp_packet_rr *)skb->data;
 957
 958         /* add record route information if not full */
 959         if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
 960             (icmp_packet->rr_cur < BAT_RR_LEN)) {
 961                 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
 962                         ethhdr->h_dest, ETH_ALEN);
 963                 icmp_packet->rr_cur++;
 964         }
 965
 966         /* packet for me */
 967         if (is_my_mac(icmp_packet->dst))
 968                 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
 969
 970         /* TTL exceeded */
 971         if (icmp_packet->ttl < 2)
 972                 return recv_icmp_ttl_exceeded(bat_priv, skb);
 973
 974         ret = NET_RX_DROP;
 975
 976         /* get routing information */
 977         spin_lock_bh(&bat_priv->orig_hash_lock);
 978         orig_node = ((struct orig_node *)
 979                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
 980                                icmp_packet->dst));
 981
 982         if ((orig_node) && (orig_node->router)) {
 983
 984                 /* don't lock while sending the packets ... we therefore
 985                  * copy the required data before sending */
 986                 batman_if = orig_node->router->if_incoming;
 987                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 988                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 989
 990                 /* create a copy of the skb, if needed, to modify it. */
 991                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 992                         return NET_RX_DROP;
 993
 994                 icmp_packet = (struct icmp_packet_rr *)skb->data;
 995
 996                 /* decrement ttl */
 997                 icmp_packet->ttl--;
 998
 999                 /* route it */
1000                 send_skb_packet(skb, batman_if, dstaddr);
1001                 ret = NET_RX_SUCCESS;
1002
1003         } else
1004                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1005
1006         return ret;
1007 }
1008
1009 /* find a suitable router for this originator, and use
1010  * bonding if possible. */
1011 struct neigh_node *find_router(struct bat_priv *bat_priv,
1012                                struct orig_node *orig_node,
1013                                struct batman_if *recv_if)
1014 {
1015         struct orig_node *primary_orig_node;
1016         struct orig_node *router_orig;
1017         struct neigh_node *router, *first_candidate, *best_router;
1018         static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1019         int bonding_enabled;
1020
1021         if (!orig_node)
1022                 return NULL;
1023
1024         if (!orig_node->router)
1025                 return NULL;
1026
1027         /* without bonding, the first node should
1028          * always choose the default router. */
1029
1030         bonding_enabled = atomic_read(&bat_priv->bonding);
1031
1032         if ((!recv_if) && (!bonding_enabled))
1033                 return orig_node->router;
1034
1035         router_orig = orig_node->router->orig_node;
1036
1037         /* if we have something in the primary_addr, we can search
1038          * for a potential bonding candidate. */
1039         if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
1040                 return orig_node->router;
1041
1042         /* find the orig_node which has the primary interface. might
1043          * even be the same as our router_orig in many cases */
1044
1045         if (memcmp(router_orig->primary_addr,
1046                                 router_orig->orig, ETH_ALEN) == 0) {
1047                 primary_orig_node = router_orig;
1048         } else {
1049                 primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig,
1050                                                choose_orig,
1051                                                router_orig->primary_addr);
1052
1053                 if (!primary_orig_node)
1054                         return orig_node->router;
1055         }
1056
1057         /* with less than 2 candidates, we can't do any
1058          * bonding and prefer the original router. */
1059
1060         if (primary_orig_node->bond.candidates < 2)
1061                 return orig_node->router;
1062
1063
1064         /* all nodes between should choose a candidate which
1065          * is is not on the interface where the packet came
1066          * in. */
1067         first_candidate = primary_orig_node->bond.selected;
1068         router = first_candidate;
1069
1070         if (bonding_enabled) {
1071                 /* in the bonding case, send the packets in a round
1072                  * robin fashion over the remaining interfaces. */
1073                 do {
1074                         /* recv_if == NULL on the first node. */
1075                         if (router->if_incoming != recv_if)
1076                                 break;
1077
1078                         router = router->next_bond_candidate;
1079                 } while (router != first_candidate);
1080
1081                 primary_orig_node->bond.selected = router->next_bond_candidate;
1082
1083         } else {
1084                 /* if bonding is disabled, use the best of the
1085                  * remaining candidates which are not using
1086                  * this interface. */
1087                 best_router = first_candidate;
1088
1089                 do {
1090                         /* recv_if == NULL on the first node. */
1091                         if ((router->if_incoming != recv_if) &&
1092                                 (router->tq_avg > best_router->tq_avg))
1093                                         best_router = router;
1094
1095                         router = router->next_bond_candidate;
1096                 } while (router != first_candidate);
1097
1098                 router = best_router;
1099         }
1100
1101         return router;
1102 }
1103
1104 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1105 {
1106         struct ethhdr *ethhdr;
1107
1108         /* drop packet if it has not necessary minimum size */
1109         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1110                 return -1;
1111
1112         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1113
1114         /* packet with unicast indication but broadcast recipient */
1115         if (is_broadcast_ether_addr(ethhdr->h_dest))
1116                 return -1;
1117
1118         /* packet with broadcast sender address */
1119         if (is_broadcast_ether_addr(ethhdr->h_source))
1120                 return -1;
1121
1122         /* not for me */
1123         if (!is_my_mac(ethhdr->h_dest))
1124                 return -1;
1125
1126         return 0;
1127 }
1128
1129 int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
1130                          int hdr_size)
1131 {
1132         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1133         struct orig_node *orig_node;
1134         struct neigh_node *router;
1135         struct batman_if *batman_if;
1136         uint8_t dstaddr[ETH_ALEN];
1137         struct unicast_packet *unicast_packet;
1138         struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
1139         int ret;
1140         struct sk_buff *new_skb;
1141
1142         unicast_packet = (struct unicast_packet *)skb->data;
1143
1144         /* TTL exceeded */
1145         if (unicast_packet->ttl < 2) {
1146                 pr_debug("Warning - can't forward unicast packet from %pM to "
1147                          "%pM: ttl exceeded\n", ethhdr->h_source,
1148                          unicast_packet->dest);
1149                 return NET_RX_DROP;
1150         }
1151
1152         /* get routing information */
1153         spin_lock_bh(&bat_priv->orig_hash_lock);
1154         orig_node = ((struct orig_node *)
1155                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
1156                                unicast_packet->dest));
1157
1158         router = find_router(bat_priv, orig_node, recv_if);
1159
1160         if (!router) {
1161                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1162                 return NET_RX_DROP;
1163         }
1164
1165         /* don't lock while sending the packets ... we therefore
1166          * copy the required data before sending */
1167
1168         batman_if = router->if_incoming;
1169         memcpy(dstaddr, router->addr, ETH_ALEN);
1170
1171         spin_unlock_bh(&bat_priv->orig_hash_lock);
1172
1173         /* create a copy of the skb, if needed, to modify it. */
1174         if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1175                 return NET_RX_DROP;
1176
1177         unicast_packet = (struct unicast_packet *)skb->data;
1178
1179         if (unicast_packet->packet_type == BAT_UNICAST &&
1180             atomic_read(&bat_priv->fragmentation) &&
1181             skb->len > batman_if->net_dev->mtu)
1182                 return frag_send_skb(skb, bat_priv, batman_if,
1183                                      dstaddr);
1184
1185         if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
1186             frag_can_reassemble(skb, batman_if->net_dev->mtu)) {
1187
1188                 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1189
1190                 if (ret == NET_RX_DROP)
1191                         return NET_RX_DROP;
1192
1193                 /* packet was buffered for late merge */
1194                 if (!new_skb)
1195                         return NET_RX_SUCCESS;
1196
1197                 skb = new_skb;
1198                 unicast_packet = (struct unicast_packet *)skb->data;
1199         }
1200
1201         /* decrement ttl */
1202         unicast_packet->ttl--;
1203
1204         /* route it */
1205         send_skb_packet(skb, batman_if, dstaddr);
1206
1207         return NET_RX_SUCCESS;
1208 }
1209
1210 int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1211 {
1212         struct unicast_packet *unicast_packet;
1213         int hdr_size = sizeof(struct unicast_packet);
1214
1215         if (check_unicast_packet(skb, hdr_size) < 0)
1216                 return NET_RX_DROP;
1217
1218         unicast_packet = (struct unicast_packet *)skb->data;
1219
1220         /* packet for me */
1221         if (is_my_mac(unicast_packet->dest)) {
1222                 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1223                 return NET_RX_SUCCESS;
1224         }
1225
1226         return route_unicast_packet(skb, recv_if, hdr_size);
1227 }
1228
1229 int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
1230 {
1231         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1232         struct unicast_frag_packet *unicast_packet;
1233         int hdr_size = sizeof(struct unicast_frag_packet);
1234         struct sk_buff *new_skb = NULL;
1235         int ret;
1236
1237         if (check_unicast_packet(skb, hdr_size) < 0)
1238                 return NET_RX_DROP;
1239
1240         unicast_packet = (struct unicast_frag_packet *)skb->data;
1241
1242         /* packet for me */
1243         if (is_my_mac(unicast_packet->dest)) {
1244
1245                 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1246
1247                 if (ret == NET_RX_DROP)
1248                         return NET_RX_DROP;
1249
1250                 /* packet was buffered for late merge */
1251                 if (!new_skb)
1252                         return NET_RX_SUCCESS;
1253
1254                 interface_rx(recv_if->soft_iface, new_skb, recv_if,
1255                              sizeof(struct unicast_packet));
1256                 return NET_RX_SUCCESS;
1257         }
1258
1259         return route_unicast_packet(skb, recv_if, hdr_size);
1260 }
1261
1262
1263 int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1264 {
1265         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1266         struct orig_node *orig_node;
1267         struct bcast_packet *bcast_packet;
1268         struct ethhdr *ethhdr;
1269         int hdr_size = sizeof(struct bcast_packet);
1270         int32_t seq_diff;
1271
1272         /* drop packet if it has not necessary minimum size */
1273         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1274                 return NET_RX_DROP;
1275
1276         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1277
1278         /* packet with broadcast indication but unicast recipient */
1279         if (!is_broadcast_ether_addr(ethhdr->h_dest))
1280                 return NET_RX_DROP;
1281
1282         /* packet with broadcast sender address */
1283         if (is_broadcast_ether_addr(ethhdr->h_source))
1284                 return NET_RX_DROP;
1285
1286         /* ignore broadcasts sent by myself */
1287         if (is_my_mac(ethhdr->h_source))
1288                 return NET_RX_DROP;
1289
1290         bcast_packet = (struct bcast_packet *)skb->data;
1291
1292         /* ignore broadcasts originated by myself */
1293         if (is_my_mac(bcast_packet->orig))
1294                 return NET_RX_DROP;
1295
1296         if (bcast_packet->ttl < 2)
1297                 return NET_RX_DROP;
1298
1299         spin_lock_bh(&bat_priv->orig_hash_lock);
1300         orig_node = ((struct orig_node *)
1301                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
1302                                bcast_packet->orig));
1303
1304         if (!orig_node) {
1305                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1306                 return NET_RX_DROP;
1307         }
1308
1309         /* check whether the packet is a duplicate */
1310         if (get_bit_status(orig_node->bcast_bits,
1311                            orig_node->last_bcast_seqno,
1312                            ntohl(bcast_packet->seqno))) {
1313                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1314                 return NET_RX_DROP;
1315         }
1316
1317         seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1318
1319         /* check whether the packet is old and the host just restarted. */
1320         if (window_protected(bat_priv, seq_diff,
1321                              &orig_node->bcast_seqno_reset)) {
1322                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1323                 return NET_RX_DROP;
1324         }
1325
1326         /* mark broadcast in flood history, update window position
1327          * if required. */
1328         if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1329                 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1330
1331         spin_unlock_bh(&bat_priv->orig_hash_lock);
1332         /* rebroadcast packet */
1333         add_bcast_packet_to_list(bat_priv, skb);
1334
1335         /* broadcast for me */
1336         interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1337
1338         return NET_RX_SUCCESS;
1339 }
1340
1341 int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if)
1342 {
1343         struct vis_packet *vis_packet;
1344         struct ethhdr *ethhdr;
1345         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1346         int hdr_size = sizeof(struct vis_packet);
1347
1348         /* keep skb linear */
1349         if (skb_linearize(skb) < 0)
1350                 return NET_RX_DROP;
1351
1352         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1353                 return NET_RX_DROP;
1354
1355         vis_packet = (struct vis_packet *)skb->data;
1356         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1357
1358         /* not for me */
1359         if (!is_my_mac(ethhdr->h_dest))
1360                 return NET_RX_DROP;
1361
1362         /* ignore own packets */
1363         if (is_my_mac(vis_packet->vis_orig))
1364                 return NET_RX_DROP;
1365
1366         if (is_my_mac(vis_packet->sender_orig))
1367                 return NET_RX_DROP;
1368
1369         switch (vis_packet->vis_type) {
1370         case VIS_TYPE_SERVER_SYNC:
1371                 receive_server_sync_packet(bat_priv, vis_packet,
1372                                            skb_headlen(skb));
1373                 break;
1374
1375         case VIS_TYPE_CLIENT_UPDATE:
1376                 receive_client_update_packet(bat_priv, vis_packet,
1377                                              skb_headlen(skb));
1378                 break;
1379
1380         default:        /* ignore unknown packet */
1381                 break;
1382         }
1383
1384         /* We take a copy of the data in the packet, so we should
1385            always free the skbuf. */
1386         return NET_RX_DROP;
1387 }