drivers/staging/batman-adv/routing.c

   1 /*
   2  * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "routing.h"
  24 #include "send.h"
  25 #include "hash.h"
  26 #include "soft-interface.h"
  27 #include "hard-interface.h"
  28 #include "icmp_socket.h"
  29 #include "translation-table.h"
  30 #include "originator.h"
  31 #include "types.h"
  32 #include "ring_buffer.h"
  33 #include "vis.h"
  34 #include "aggregation.h"
  35 #include "unicast.h"
  36
  37 void slide_own_bcast_window(struct batman_if *batman_if)
  38 {
  39         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
  40         HASHIT(hashit);
  41         struct orig_node *orig_node;
  42         TYPE_OF_WORD *word;
  43         unsigned long flags;
  44
  45         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
  46
  47         while (hash_iterate(bat_priv->orig_hash, &hashit)) {
  48                 orig_node = hashit.bucket->data;
  49                 word = &(orig_node->bcast_own[batman_if->if_num * NUM_WORDS]);
  50
  51                 bit_get_packet(bat_priv, word, 1, 0);
  52                 orig_node->bcast_own_sum[batman_if->if_num] =
  53                         bit_packet_count(word);
  54         }
  55
  56         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
  57 }
  58
  59 static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node,
  60                        unsigned char *hna_buff, int hna_buff_len)
  61 {
  62         if ((hna_buff_len != orig_node->hna_buff_len) ||
  63             ((hna_buff_len > 0) &&
  64              (orig_node->hna_buff_len > 0) &&
  65              (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
  66
  67                 if (orig_node->hna_buff_len > 0)
  68                         hna_global_del_orig(bat_priv, orig_node,
  69                                             "originator changed hna");
  70
  71                 if ((hna_buff_len > 0) && (hna_buff != NULL))
  72                         hna_global_add_orig(bat_priv, orig_node,
  73                                             hna_buff, hna_buff_len);
  74         }
  75 }
  76
  77 static void update_route(struct bat_priv *bat_priv,
  78                          struct orig_node *orig_node,
  79                          struct neigh_node *neigh_node,
  80                          unsigned char *hna_buff, int hna_buff_len)
  81 {
  82         /* route deleted */
  83         if ((orig_node->router != NULL) && (neigh_node == NULL)) {
  84
  85                 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
  86                         orig_node->orig);
  87                 hna_global_del_orig(bat_priv, orig_node,
  88                                     "originator timed out");
  89
  90                 /* route added */
  91         } else if ((orig_node->router == NULL) && (neigh_node != NULL)) {
  92
  93                 bat_dbg(DBG_ROUTES, bat_priv,
  94                         "Adding route towards: %pM (via %pM)\n",
  95                         orig_node->orig, neigh_node->addr);
  96                 hna_global_add_orig(bat_priv, orig_node,
  97                                     hna_buff, hna_buff_len);
  98
  99                 /* route changed */
 100         } else {
 101                 bat_dbg(DBG_ROUTES, bat_priv,
 102                         "Changing route towards: %pM "
 103                         "(now via %pM - was via %pM)\n",
 104                         orig_node->orig, neigh_node->addr,
 105                         orig_node->router->addr);
 106         }
 107
 108         orig_node->router = neigh_node;
 109 }
 110
 111
 112 void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
 113                    struct neigh_node *neigh_node, unsigned char *hna_buff,
 114                    int hna_buff_len)
 115 {
 116
 117         if (orig_node == NULL)
 118                 return;
 119
 120         if (orig_node->router != neigh_node)
 121                 update_route(bat_priv, orig_node, neigh_node,
 122                              hna_buff, hna_buff_len);
 123         /* may be just HNA changed */
 124         else
 125                 update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
 126 }
 127
 128 static int is_bidirectional_neigh(struct orig_node *orig_node,
 129                                 struct orig_node *orig_neigh_node,
 130                                 struct batman_packet *batman_packet,
 131                                 struct batman_if *if_incoming)
 132 {
 133         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 134         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 135         unsigned char total_count;
 136
 137         if (orig_node == orig_neigh_node) {
 138                 list_for_each_entry(tmp_neigh_node,
 139                                     &orig_node->neigh_list,
 140                                     list) {
 141
 142                         if (compare_orig(tmp_neigh_node->addr,
 143                                          orig_neigh_node->orig) &&
 144                             (tmp_neigh_node->if_incoming == if_incoming))
 145                                 neigh_node = tmp_neigh_node;
 146                 }
 147
 148                 if (!neigh_node)
 149                         neigh_node = create_neighbor(orig_node,
 150                                                      orig_neigh_node,
 151                                                      orig_neigh_node->orig,
 152                                                      if_incoming);
 153                 /* create_neighbor failed, return 0 */
 154                 if (!neigh_node)
 155                         return 0;
 156
 157                 neigh_node->last_valid = jiffies;
 158         } else {
 159                 /* find packet count of corresponding one hop neighbor */
 160                 list_for_each_entry(tmp_neigh_node,
 161                                     &orig_neigh_node->neigh_list, list) {
 162
 163                         if (compare_orig(tmp_neigh_node->addr,
 164                                          orig_neigh_node->orig) &&
 165                             (tmp_neigh_node->if_incoming == if_incoming))
 166                                 neigh_node = tmp_neigh_node;
 167                 }
 168
 169                 if (!neigh_node)
 170                         neigh_node = create_neighbor(orig_neigh_node,
 171                                                      orig_neigh_node,
 172                                                      orig_neigh_node->orig,
 173                                                      if_incoming);
 174                 /* create_neighbor failed, return 0 */
 175                 if (!neigh_node)
 176                         return 0;
 177         }
 178
 179         orig_node->last_valid = jiffies;
 180
 181         /* pay attention to not get a value bigger than 100 % */
 182         total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
 183                        neigh_node->real_packet_count ?
 184                        neigh_node->real_packet_count :
 185                        orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
 186
 187         /* if we have too few packets (too less data) we set tq_own to zero */
 188         /* if we receive too few packets it is not considered bidirectional */
 189         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 190             (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 191                 orig_neigh_node->tq_own = 0;
 192         else
 193                 /* neigh_node->real_packet_count is never zero as we
 194                  * only purge old information when getting new
 195                  * information */
 196                 orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
 197                         neigh_node->real_packet_count;
 198
 199         /*
 200          * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 201          * affect the nearly-symmetric links only a little, but
 202          * punishes asymmetric links more.  This will give a value
 203          * between 0 and TQ_MAX_VALUE
 204          */
 205         orig_neigh_node->tq_asym_penalty =
 206                 TQ_MAX_VALUE -
 207                 (TQ_MAX_VALUE *
 208                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 209                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 210                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
 211                 (TQ_LOCAL_WINDOW_SIZE *
 212                  TQ_LOCAL_WINDOW_SIZE *
 213                  TQ_LOCAL_WINDOW_SIZE);
 214
 215         batman_packet->tq = ((batman_packet->tq *
 216                               orig_neigh_node->tq_own *
 217                               orig_neigh_node->tq_asym_penalty) /
 218                              (TQ_MAX_VALUE * TQ_MAX_VALUE));
 219
 220         bat_dbg(DBG_BATMAN, bat_priv,
 221                 "bidirectional: "
 222                 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
 223                 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
 224                 "total tq: %3i\n",
 225                 orig_node->orig, orig_neigh_node->orig, total_count,
 226                 neigh_node->real_packet_count, orig_neigh_node->tq_own,
 227                 orig_neigh_node->tq_asym_penalty, batman_packet->tq);
 228
 229         /* if link has the minimum required transmission quality
 230          * consider it bidirectional */
 231         if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 232                 return 1;
 233
 234         return 0;
 235 }
 236
 237 static void update_orig(struct bat_priv *bat_priv,
 238                         struct orig_node *orig_node,
 239                         struct ethhdr *ethhdr,
 240                         struct batman_packet *batman_packet,
 241                         struct batman_if *if_incoming,
 242                         unsigned char *hna_buff, int hna_buff_len,
 243                         char is_duplicate)
 244 {
 245         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 246         int tmp_hna_buff_len;
 247
 248         bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
 249                 "Searching and updating originator entry of received packet\n");
 250
 251         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 252                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 253                     (tmp_neigh_node->if_incoming == if_incoming)) {
 254                         neigh_node = tmp_neigh_node;
 255                         continue;
 256                 }
 257
 258                 if (is_duplicate)
 259                         continue;
 260
 261                 ring_buffer_set(tmp_neigh_node->tq_recv,
 262                                 &tmp_neigh_node->tq_index, 0);
 263                 tmp_neigh_node->tq_avg =
 264                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 265         }
 266
 267         if (!neigh_node) {
 268                 struct orig_node *orig_tmp;
 269
 270                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 271                 if (!orig_tmp)
 272                         return;
 273
 274                 neigh_node = create_neighbor(orig_node, orig_tmp,
 275                                              ethhdr->h_source, if_incoming);
 276                 if (!neigh_node)
 277                         return;
 278         } else
 279                 bat_dbg(DBG_BATMAN, bat_priv,
 280                         "Updating existing last-hop neighbor of originator\n");
 281
 282         orig_node->flags = batman_packet->flags;
 283         neigh_node->last_valid = jiffies;
 284
 285         ring_buffer_set(neigh_node->tq_recv,
 286                         &neigh_node->tq_index,
 287                         batman_packet->tq);
 288         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 289
 290         if (!is_duplicate) {
 291                 orig_node->last_ttl = batman_packet->ttl;
 292                 neigh_node->last_ttl = batman_packet->ttl;
 293         }
 294
 295         tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
 296                             batman_packet->num_hna * ETH_ALEN : hna_buff_len);
 297
 298         /* if this neighbor already is our next hop there is nothing
 299          * to change */
 300         if (orig_node->router == neigh_node)
 301                 goto update_hna;
 302
 303         /* if this neighbor does not offer a better TQ we won't consider it */
 304         if ((orig_node->router) &&
 305             (orig_node->router->tq_avg > neigh_node->tq_avg))
 306                 goto update_hna;
 307
 308         /* if the TQ is the same and the link not more symetric we
 309          * won't consider it either */
 310         if ((orig_node->router) &&
 311              ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
 312              (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
 313               >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
 314                 goto update_hna;
 315
 316         update_routes(bat_priv, orig_node, neigh_node,
 317                       hna_buff, tmp_hna_buff_len);
 318         return;
 319
 320 update_hna:
 321         update_routes(bat_priv, orig_node, orig_node->router,
 322                       hna_buff, tmp_hna_buff_len);
 323 }
 324
 325 /* checks whether the host restarted and is in the protection time.
 326  * returns:
 327  *  0 if the packet is to be accepted
 328  *  1 if the packet is to be ignored.
 329  */
 330 static int window_protected(struct bat_priv *bat_priv,
 331                             int32_t seq_num_diff,
 332                             unsigned long *last_reset)
 333 {
 334         if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
 335                 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
 336                 if (time_after(jiffies, *last_reset +
 337                         msecs_to_jiffies(RESET_PROTECTION_MS))) {
 338
 339                         *last_reset = jiffies;
 340                         bat_dbg(DBG_BATMAN, bat_priv,
 341                                 "old packet received, start protection\n");
 342
 343                         return 0;
 344                 } else
 345                         return 1;
 346         }
 347         return 0;
 348 }
 349
 350 /* processes a batman packet for all interfaces, adjusts the sequence number and
 351  * finds out whether it is a duplicate.
 352  * returns:
 353  *   1 the packet is a duplicate
 354  *   0 the packet has not yet been received
 355  *  -1 the packet is old and has been received while the seqno window
 356  *     was protected. Caller should drop it.
 357  */
 358 static char count_real_packets(struct ethhdr *ethhdr,
 359                                struct batman_packet *batman_packet,
 360                                struct batman_if *if_incoming)
 361 {
 362         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 363         struct orig_node *orig_node;
 364         struct neigh_node *tmp_neigh_node;
 365         char is_duplicate = 0;
 366         int32_t seq_diff;
 367         int need_update = 0;
 368         int set_mark;
 369
 370         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 371         if (orig_node == NULL)
 372                 return 0;
 373
 374         seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
 375
 376         /* signalize caller that the packet is to be dropped. */
 377         if (window_protected(bat_priv, seq_diff,
 378                              &orig_node->batman_seqno_reset))
 379                 return -1;
 380
 381         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 382
 383                 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
 384                                                orig_node->last_real_seqno,
 385                                                batman_packet->seqno);
 386
 387                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 388                     (tmp_neigh_node->if_incoming == if_incoming))
 389                         set_mark = 1;
 390                 else
 391                         set_mark = 0;
 392
 393                 /* if the window moved, set the update flag. */
 394                 need_update |= bit_get_packet(bat_priv,
 395                                               tmp_neigh_node->real_bits,
 396                                               seq_diff, set_mark);
 397
 398                 tmp_neigh_node->real_packet_count =
 399                         bit_packet_count(tmp_neigh_node->real_bits);
 400         }
 401
 402         if (need_update) {
 403                 bat_dbg(DBG_BATMAN, bat_priv,
 404                         "updating last_seqno: old %d, new %d\n",
 405                         orig_node->last_real_seqno, batman_packet->seqno);
 406                 orig_node->last_real_seqno = batman_packet->seqno;
 407         }
 408
 409         return is_duplicate;
 410 }
 411
 412 /* copy primary address for bonding */
 413 static void mark_bonding_address(struct bat_priv *bat_priv,
 414                                  struct orig_node *orig_node,
 415                                  struct orig_node *orig_neigh_node,
 416                                  struct batman_packet *batman_packet)
 417
 418 {
 419         if (batman_packet->flags & PRIMARIES_FIRST_HOP)
 420                 memcpy(orig_neigh_node->primary_addr,
 421                        orig_node->orig, ETH_ALEN);
 422
 423         return;
 424 }
 425
 426 /* mark possible bond.candidates in the neighbor list */
 427 void update_bonding_candidates(struct bat_priv *bat_priv,
 428                                struct orig_node *orig_node)
 429 {
 430         int candidates;
 431         int interference_candidate;
 432         int best_tq;
 433         struct neigh_node *tmp_neigh_node, *tmp_neigh_node2;
 434         struct neigh_node *first_candidate, *last_candidate;
 435
 436         /* update the candidates for this originator */
 437         if (!orig_node->router) {
 438                 orig_node->bond.candidates = 0;
 439                 return;
 440         }
 441
 442         best_tq = orig_node->router->tq_avg;
 443
 444         /* update bond.candidates */
 445
 446         candidates = 0;
 447
 448         /* mark other nodes which also received "PRIMARIES FIRST HOP" packets
 449          * as "bonding partner" */
 450
 451         /* first, zero the list */
 452         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 453                 tmp_neigh_node->next_bond_candidate = NULL;
 454         }
 455
 456         first_candidate = NULL;
 457         last_candidate = NULL;
 458         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 459
 460                 /* only consider if it has the same primary address ...  */
 461                 if (memcmp(orig_node->orig,
 462                                 tmp_neigh_node->orig_node->primary_addr,
 463                                 ETH_ALEN) != 0)
 464                         continue;
 465
 466                 /* ... and is good enough to be considered */
 467                 if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
 468                         continue;
 469
 470                 /* check if we have another candidate with the same
 471                  * mac address or interface. If we do, we won't
 472                  * select this candidate because of possible interference. */
 473
 474                 interference_candidate = 0;
 475                 list_for_each_entry(tmp_neigh_node2,
 476                                 &orig_node->neigh_list, list) {
 477
 478                         if (tmp_neigh_node2 == tmp_neigh_node)
 479                                 continue;
 480
 481                         /* we only care if the other candidate is even
 482                          * considered as candidate. */
 483                         if (tmp_neigh_node2->next_bond_candidate == NULL)
 484                                 continue;
 485
 486
 487                         if ((tmp_neigh_node->if_incoming ==
 488                                 tmp_neigh_node2->if_incoming)
 489                                 || (memcmp(tmp_neigh_node->addr,
 490                                 tmp_neigh_node2->addr, ETH_ALEN) == 0)) {
 491
 492                                 interference_candidate = 1;
 493                                 break;
 494                         }
 495                 }
 496                 /* don't care further if it is an interference candidate */
 497                 if (interference_candidate)
 498                         continue;
 499
 500                 if (first_candidate == NULL) {
 501                         first_candidate = tmp_neigh_node;
 502                         tmp_neigh_node->next_bond_candidate = first_candidate;
 503                 } else
 504                         tmp_neigh_node->next_bond_candidate = last_candidate;
 505
 506                 last_candidate = tmp_neigh_node;
 507
 508                 candidates++;
 509         }
 510
 511         if (candidates > 0) {
 512                 first_candidate->next_bond_candidate = last_candidate;
 513                 orig_node->bond.selected = first_candidate;
 514         }
 515
 516         orig_node->bond.candidates = candidates;
 517 }
 518
 519 void receive_bat_packet(struct ethhdr *ethhdr,
 520                                 struct batman_packet *batman_packet,
 521                                 unsigned char *hna_buff, int hna_buff_len,
 522                                 struct batman_if *if_incoming)
 523 {
 524         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 525         struct batman_if *batman_if;
 526         struct orig_node *orig_neigh_node, *orig_node;
 527         char has_directlink_flag;
 528         char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 529         char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 530         char is_duplicate;
 531         uint32_t if_incoming_seqno;
 532
 533         /* Silently drop when the batman packet is actually not a
 534          * correct packet.
 535          *
 536          * This might happen if a packet is padded (e.g. Ethernet has a
 537          * minimum frame length of 64 byte) and the aggregation interprets
 538          * it as an additional length.
 539          *
 540          * TODO: A more sane solution would be to have a bit in the
 541          * batman_packet to detect whether the packet is the last
 542          * packet in an aggregation.  Here we expect that the padding
 543          * is always zero (or not 0x01)
 544          */
 545         if (batman_packet->packet_type != BAT_PACKET)
 546                 return;
 547
 548         /* could be changed by schedule_own_packet() */
 549         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 550
 551         has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
 552
 553         is_single_hop_neigh = (compare_orig(ethhdr->h_source,
 554                                             batman_packet->orig) ? 1 : 0);
 555
 556         bat_dbg(DBG_BATMAN, bat_priv,
 557                 "Received BATMAN packet via NB: %pM, IF: %s [%pM] "
 558                 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
 559                 "TTL %d, V %d, IDF %d)\n",
 560                 ethhdr->h_source, if_incoming->net_dev->name,
 561                 if_incoming->net_dev->dev_addr, batman_packet->orig,
 562                 batman_packet->prev_sender, batman_packet->seqno,
 563                 batman_packet->tq, batman_packet->ttl, batman_packet->version,
 564                 has_directlink_flag);
 565
 566         rcu_read_lock();
 567         list_for_each_entry_rcu(batman_if, &if_list, list) {
 568                 if (batman_if->if_status != IF_ACTIVE)
 569                         continue;
 570
 571                 if (batman_if->soft_iface != if_incoming->soft_iface)
 572                         continue;
 573
 574                 if (compare_orig(ethhdr->h_source,
 575                                  batman_if->net_dev->dev_addr))
 576                         is_my_addr = 1;
 577
 578                 if (compare_orig(batman_packet->orig,
 579                                  batman_if->net_dev->dev_addr))
 580                         is_my_orig = 1;
 581
 582                 if (compare_orig(batman_packet->prev_sender,
 583                                  batman_if->net_dev->dev_addr))
 584                         is_my_oldorig = 1;
 585
 586                 if (compare_orig(ethhdr->h_source, broadcast_addr))
 587                         is_broadcast = 1;
 588         }
 589         rcu_read_unlock();
 590
 591         if (batman_packet->version != COMPAT_VERSION) {
 592                 bat_dbg(DBG_BATMAN, bat_priv,
 593                         "Drop packet: incompatible batman version (%i)\n",
 594                         batman_packet->version);
 595                 return;
 596         }
 597
 598         if (is_my_addr) {
 599                 bat_dbg(DBG_BATMAN, bat_priv,
 600                         "Drop packet: received my own broadcast (sender: %pM"
 601                         ")\n",
 602                         ethhdr->h_source);
 603                 return;
 604         }
 605
 606         if (is_broadcast) {
 607                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 608                 "ignoring all packets with broadcast source addr (sender: %pM"
 609                 ")\n", ethhdr->h_source);
 610                 return;
 611         }
 612
 613         if (is_my_orig) {
 614                 TYPE_OF_WORD *word;
 615                 int offset;
 616
 617                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
 618
 619                 if (!orig_neigh_node)
 620                         return;
 621
 622                 /* neighbor has to indicate direct link and it has to
 623                  * come via the corresponding interface */
 624                 /* if received seqno equals last send seqno save new
 625                  * seqno for bidirectional check */
 626                 if (has_directlink_flag &&
 627                     compare_orig(if_incoming->net_dev->dev_addr,
 628                                  batman_packet->orig) &&
 629                     (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
 630                         offset = if_incoming->if_num * NUM_WORDS;
 631                         word = &(orig_neigh_node->bcast_own[offset]);
 632                         bit_mark(word, 0);
 633                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
 634                                 bit_packet_count(word);
 635                 }
 636
 637                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 638                         "originator packet from myself (via neighbor)\n");
 639                 return;
 640         }
 641
 642         if (is_my_oldorig) {
 643                 bat_dbg(DBG_BATMAN, bat_priv,
 644                         "Drop packet: ignoring all rebroadcast echos (sender: "
 645                         "%pM)\n", ethhdr->h_source);
 646                 return;
 647         }
 648
 649         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 650         if (orig_node == NULL)
 651                 return;
 652
 653         is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
 654
 655         if (is_duplicate == -1) {
 656                 bat_dbg(DBG_BATMAN, bat_priv,
 657                         "Drop packet: packet within seqno protection time "
 658                         "(sender: %pM)\n", ethhdr->h_source);
 659                 return;
 660         }
 661
 662         if (batman_packet->tq == 0) {
 663                 bat_dbg(DBG_BATMAN, bat_priv,
 664                         "Drop packet: originator packet with tq equal 0\n");
 665                 return;
 666         }
 667
 668         /* avoid temporary routing loops */
 669         if ((orig_node->router) &&
 670             (orig_node->router->orig_node->router) &&
 671             (compare_orig(orig_node->router->addr,
 672                           batman_packet->prev_sender)) &&
 673             !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
 674             (compare_orig(orig_node->router->addr,
 675                           orig_node->router->orig_node->router->addr))) {
 676                 bat_dbg(DBG_BATMAN, bat_priv,
 677                         "Drop packet: ignoring all rebroadcast packets that "
 678                         "may make me loop (sender: %pM)\n", ethhdr->h_source);
 679                 return;
 680         }
 681
 682         /* if sender is a direct neighbor the sender mac equals
 683          * originator mac */
 684         orig_neigh_node = (is_single_hop_neigh ?
 685                            orig_node :
 686                            get_orig_node(bat_priv, ethhdr->h_source));
 687         if (orig_neigh_node == NULL)
 688                 return;
 689
 690         /* drop packet if sender is not a direct neighbor and if we
 691          * don't route towards it */
 692         if (!is_single_hop_neigh &&
 693             (orig_neigh_node->router == NULL)) {
 694                 bat_dbg(DBG_BATMAN, bat_priv,
 695                         "Drop packet: OGM via unknown neighbor!\n");
 696                 return;
 697         }
 698
 699         is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
 700                                                 batman_packet, if_incoming);
 701
 702         /* update ranking if it is not a duplicate or has the same
 703          * seqno and similar ttl as the non-duplicate */
 704         if (is_bidirectional &&
 705             (!is_duplicate ||
 706              ((orig_node->last_real_seqno == batman_packet->seqno) &&
 707               (orig_node->last_ttl - 3 <= batman_packet->ttl))))
 708                 update_orig(bat_priv, orig_node, ethhdr, batman_packet,
 709                             if_incoming, hna_buff, hna_buff_len, is_duplicate);
 710
 711         mark_bonding_address(bat_priv, orig_node,
 712                              orig_neigh_node, batman_packet);
 713         update_bonding_candidates(bat_priv, orig_node);
 714
 715         /* is single hop (direct) neighbor */
 716         if (is_single_hop_neigh) {
 717
 718                 /* mark direct link on incoming interface */
 719                 schedule_forward_packet(orig_node, ethhdr, batman_packet,
 720                                         1, hna_buff_len, if_incoming);
 721
 722                 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
 723                         "rebroadcast neighbor packet with direct link flag\n");
 724                 return;
 725         }
 726
 727         /* multihop originator */
 728         if (!is_bidirectional) {
 729                 bat_dbg(DBG_BATMAN, bat_priv,
 730                         "Drop packet: not received via bidirectional link\n");
 731                 return;
 732         }
 733
 734         if (is_duplicate) {
 735                 bat_dbg(DBG_BATMAN, bat_priv,
 736                         "Drop packet: duplicate packet received\n");
 737                 return;
 738         }
 739
 740         bat_dbg(DBG_BATMAN, bat_priv,
 741                 "Forwarding packet: rebroadcast originator packet\n");
 742         schedule_forward_packet(orig_node, ethhdr, batman_packet,
 743                                 0, hna_buff_len, if_incoming);
 744 }
 745
 746 int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
 747 {
 748         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 749         struct ethhdr *ethhdr;
 750         unsigned long flags;
 751
 752         /* drop packet if it has not necessary minimum size */
 753         if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
 754                 return NET_RX_DROP;
 755
 756         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 757
 758         /* packet with broadcast indication but unicast recipient */
 759         if (!is_bcast(ethhdr->h_dest))
 760                 return NET_RX_DROP;
 761
 762         /* packet with broadcast sender address */
 763         if (is_bcast(ethhdr->h_source))
 764                 return NET_RX_DROP;
 765
 766         /* create a copy of the skb, if needed, to modify it. */
 767         if (skb_cow(skb, 0) < 0)
 768                 return NET_RX_DROP;
 769
 770         /* keep skb linear */
 771         if (skb_linearize(skb) < 0)
 772                 return NET_RX_DROP;
 773
 774         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 775
 776         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 777         receive_aggr_bat_packet(ethhdr,
 778                                 skb->data,
 779                                 skb_headlen(skb),
 780                                 batman_if);
 781         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 782
 783         kfree_skb(skb);
 784         return NET_RX_SUCCESS;
 785 }
 786
 787 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
 788                                struct sk_buff *skb, size_t icmp_len)
 789 {
 790         struct orig_node *orig_node;
 791         struct icmp_packet_rr *icmp_packet;
 792         struct ethhdr *ethhdr;
 793         struct batman_if *batman_if;
 794         int ret;
 795         unsigned long flags;
 796         uint8_t dstaddr[ETH_ALEN];
 797
 798         icmp_packet = (struct icmp_packet_rr *)skb->data;
 799         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 800
 801         /* add data to device queue */
 802         if (icmp_packet->msg_type != ECHO_REQUEST) {
 803                 bat_socket_receive_packet(icmp_packet, icmp_len);
 804                 return NET_RX_DROP;
 805         }
 806
 807         if (!bat_priv->primary_if)
 808                 return NET_RX_DROP;
 809
 810         /* answer echo request (ping) */
 811         /* get routing information */
 812         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 813         orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
 814                                                    icmp_packet->orig));
 815         ret = NET_RX_DROP;
 816
 817         if ((orig_node != NULL) &&
 818             (orig_node->router != NULL)) {
 819
 820                 /* don't lock while sending the packets ... we therefore
 821                  * copy the required data before sending */
 822                 batman_if = orig_node->router->if_incoming;
 823                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 824                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 825
 826                 /* create a copy of the skb, if needed, to modify it. */
 827                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 828                         return NET_RX_DROP;
 829
 830                 icmp_packet = (struct icmp_packet_rr *)skb->data;
 831                 ethhdr = (struct ethhdr *)skb_mac_header(skb);
 832
 833                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 834                 memcpy(icmp_packet->orig,
 835                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 836                 icmp_packet->msg_type = ECHO_REPLY;
 837                 icmp_packet->ttl = TTL;
 838
 839                 send_skb_packet(skb, batman_if, dstaddr);
 840                 ret = NET_RX_SUCCESS;
 841
 842         } else
 843                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 844
 845         return ret;
 846 }
 847
 848 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
 849                                   struct sk_buff *skb, size_t icmp_len)
 850 {
 851         struct orig_node *orig_node;
 852         struct icmp_packet *icmp_packet;
 853         struct ethhdr *ethhdr;
 854         struct batman_if *batman_if;
 855         int ret;
 856         unsigned long flags;
 857         uint8_t dstaddr[ETH_ALEN];
 858
 859         icmp_packet = (struct icmp_packet *)skb->data;
 860         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 861
 862         /* send TTL exceeded if packet is an echo request (traceroute) */
 863         if (icmp_packet->msg_type != ECHO_REQUEST) {
 864                 pr_debug("Warning - can't forward icmp packet from %pM to "
 865                          "%pM: ttl exceeded\n", icmp_packet->orig,
 866                          icmp_packet->dst);
 867                 return NET_RX_DROP;
 868         }
 869
 870         if (!bat_priv->primary_if)
 871                 return NET_RX_DROP;
 872
 873         /* get routing information */
 874         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 875         orig_node = ((struct orig_node *)
 876                      hash_find(bat_priv->orig_hash, icmp_packet->orig));
 877         ret = NET_RX_DROP;
 878
 879         if ((orig_node != NULL) &&
 880             (orig_node->router != NULL)) {
 881
 882                 /* don't lock while sending the packets ... we therefore
 883                  * copy the required data before sending */
 884                 batman_if = orig_node->router->if_incoming;
 885                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 886                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 887
 888                 /* create a copy of the skb, if needed, to modify it. */
 889                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 890                         return NET_RX_DROP;
 891
 892                 icmp_packet = (struct icmp_packet *) skb->data;
 893                 ethhdr = (struct ethhdr *)skb_mac_header(skb);
 894
 895                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 896                 memcpy(icmp_packet->orig,
 897                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 898                 icmp_packet->msg_type = TTL_EXCEEDED;
 899                 icmp_packet->ttl = TTL;
 900
 901                 send_skb_packet(skb, batman_if, dstaddr);
 902                 ret = NET_RX_SUCCESS;
 903
 904         } else
 905                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 906
 907         return ret;
 908 }
 909
 910
 911 int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
 912 {
 913         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
 914         struct icmp_packet_rr *icmp_packet;
 915         struct ethhdr *ethhdr;
 916         struct orig_node *orig_node;
 917         struct batman_if *batman_if;
 918         int hdr_size = sizeof(struct icmp_packet);
 919         int ret;
 920         unsigned long flags;
 921         uint8_t dstaddr[ETH_ALEN];
 922
 923         /**
 924          * we truncate all incoming icmp packets if they don't match our size
 925          */
 926         if (skb->len >= sizeof(struct icmp_packet_rr))
 927                 hdr_size = sizeof(struct icmp_packet_rr);
 928
 929         /* drop packet if it has not necessary minimum size */
 930         if (unlikely(!pskb_may_pull(skb, hdr_size)))
 931                 return NET_RX_DROP;
 932
 933         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 934
 935         /* packet with unicast indication but broadcast recipient */
 936         if (is_bcast(ethhdr->h_dest))
 937                 return NET_RX_DROP;
 938
 939         /* packet with broadcast sender address */
 940         if (is_bcast(ethhdr->h_source))
 941                 return NET_RX_DROP;
 942
 943         /* not for me */
 944         if (!is_my_mac(ethhdr->h_dest))
 945                 return NET_RX_DROP;
 946
 947         icmp_packet = (struct icmp_packet_rr *)skb->data;
 948
 949         /* add record route information if not full */
 950         if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
 951             (icmp_packet->rr_cur < BAT_RR_LEN)) {
 952                 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
 953                         ethhdr->h_dest, ETH_ALEN);
 954                 icmp_packet->rr_cur++;
 955         }
 956
 957         /* packet for me */
 958         if (is_my_mac(icmp_packet->dst))
 959                 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
 960
 961         /* TTL exceeded */
 962         if (icmp_packet->ttl < 2)
 963                 return recv_icmp_ttl_exceeded(bat_priv, skb, hdr_size);
 964
 965         ret = NET_RX_DROP;
 966
 967         /* get routing information */
 968         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 969         orig_node = ((struct orig_node *)
 970                      hash_find(bat_priv->orig_hash, icmp_packet->dst));
 971
 972         if ((orig_node != NULL) &&
 973             (orig_node->router != NULL)) {
 974
 975                 /* don't lock while sending the packets ... we therefore
 976                  * copy the required data before sending */
 977                 batman_if = orig_node->router->if_incoming;
 978                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 979                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 980
 981                 /* create a copy of the skb, if needed, to modify it. */
 982                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 983                         return NET_RX_DROP;
 984
 985                 icmp_packet = (struct icmp_packet_rr *)skb->data;
 986                 ethhdr = (struct ethhdr *)skb_mac_header(skb);
 987
 988                 /* decrement ttl */
 989                 icmp_packet->ttl--;
 990
 991                 /* route it */
 992                 send_skb_packet(skb, batman_if, dstaddr);
 993                 ret = NET_RX_SUCCESS;
 994
 995         } else
 996                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 997
 998         return ret;
 999 }
1000
1001 /* find a suitable router for this originator, and use
1002  * bonding if possible. */
1003 struct neigh_node *find_router(struct bat_priv *bat_priv,
1004                                struct orig_node *orig_node,
1005                                struct batman_if *recv_if)
1006 {
1007         struct orig_node *primary_orig_node;
1008         struct orig_node *router_orig;
1009         struct neigh_node *router, *first_candidate, *best_router;
1010         static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1011         int bonding_enabled;
1012
1013         if (!orig_node)
1014                 return NULL;
1015
1016         if (!orig_node->router)
1017                 return NULL;
1018
1019         /* without bonding, the first node should
1020          * always choose the default router. */
1021
1022         bonding_enabled = atomic_read(&bat_priv->bonding_enabled);
1023
1024         if ((!recv_if) && (!bonding_enabled))
1025                 return orig_node->router;
1026
1027         router_orig = orig_node->router->orig_node;
1028
1029         /* if we have something in the primary_addr, we can search
1030          * for a potential bonding candidate. */
1031         if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
1032                 return orig_node->router;
1033
1034         /* find the orig_node which has the primary interface. might
1035          * even be the same as our router_orig in many cases */
1036
1037         if (memcmp(router_orig->primary_addr,
1038                                 router_orig->orig, ETH_ALEN) == 0) {
1039                 primary_orig_node = router_orig;
1040         } else {
1041                 primary_orig_node = hash_find(bat_priv->orig_hash,
1042                                                 router_orig->primary_addr);
1043
1044                 if (!primary_orig_node)
1045                         return orig_node->router;
1046         }
1047
1048         /* with less than 2 candidates, we can't do any
1049          * bonding and prefer the original router. */
1050
1051         if (primary_orig_node->bond.candidates < 2)
1052                 return orig_node->router;
1053
1054
1055         /* all nodes between should choose a candidate which
1056          * is is not on the interface where the packet came
1057          * in. */
1058         first_candidate = primary_orig_node->bond.selected;
1059         router = first_candidate;
1060
1061         if (bonding_enabled) {
1062                 /* in the bonding case, send the packets in a round
1063                  * robin fashion over the remaining interfaces. */
1064                 do {
1065                         /* recv_if == NULL on the first node. */
1066                         if (router->if_incoming != recv_if)
1067                                 break;
1068
1069                         router = router->next_bond_candidate;
1070                 } while (router != first_candidate);
1071
1072                 primary_orig_node->bond.selected = router->next_bond_candidate;
1073
1074         } else {
1075                 /* if bonding is disabled, use the best of the
1076                  * remaining candidates which are not using
1077                  * this interface. */
1078                 best_router = first_candidate;
1079
1080                 do {
1081                         /* recv_if == NULL on the first node. */
1082                         if ((router->if_incoming != recv_if) &&
1083                                 (router->tq_avg > best_router->tq_avg))
1084                                         best_router = router;
1085
1086                         router = router->next_bond_candidate;
1087                 } while (router != first_candidate);
1088
1089                 router = best_router;
1090         }
1091
1092         return router;
1093 }
1094
1095 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1096 {
1097         struct ethhdr *ethhdr;
1098
1099         /* drop packet if it has not necessary minimum size */
1100         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1101                 return -1;
1102
1103         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1104
1105         /* packet with unicast indication but broadcast recipient */
1106         if (is_bcast(ethhdr->h_dest))
1107                 return -1;
1108
1109         /* packet with broadcast sender address */
1110         if (is_bcast(ethhdr->h_source))
1111                 return -1;
1112
1113         /* not for me */
1114         if (!is_my_mac(ethhdr->h_dest))
1115                 return -1;
1116
1117         return 0;
1118 }
1119
1120 static int route_unicast_packet(struct sk_buff *skb,
1121                                 struct batman_if *recv_if, int hdr_size)
1122 {
1123         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1124         struct orig_node *orig_node;
1125         struct neigh_node *router;
1126         struct batman_if *batman_if;
1127         uint8_t dstaddr[ETH_ALEN];
1128         unsigned long flags;
1129         struct unicast_packet *unicast_packet;
1130         struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
1131
1132         unicast_packet = (struct unicast_packet *)skb->data;
1133
1134         /* packet for me */
1135         if (is_my_mac(unicast_packet->dest)) {
1136                 interface_rx(recv_if->soft_iface, skb, hdr_size);
1137                 return NET_RX_SUCCESS;
1138         }
1139
1140         /* TTL exceeded */
1141         if (unicast_packet->ttl < 2) {
1142                 pr_debug("Warning - can't forward unicast packet from %pM to "
1143                          "%pM: ttl exceeded\n", ethhdr->h_source,
1144                          unicast_packet->dest);
1145                 return NET_RX_DROP;
1146         }
1147
1148         /* get routing information */
1149         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
1150         orig_node = ((struct orig_node *)
1151                      hash_find(bat_priv->orig_hash, unicast_packet->dest));
1152
1153         router = find_router(bat_priv, orig_node, recv_if);
1154
1155         if (!router) {
1156                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1157                 return NET_RX_DROP;
1158         }
1159
1160         /* don't lock while sending the packets ... we therefore
1161          * copy the required data before sending */
1162
1163         batman_if = router->if_incoming;
1164         memcpy(dstaddr, router->addr, ETH_ALEN);
1165
1166         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1167
1168         /* create a copy of the skb, if needed, to modify it. */
1169         if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1170                 return NET_RX_DROP;
1171
1172         unicast_packet = (struct unicast_packet *)skb->data;
1173         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1174
1175         /* decrement ttl */
1176         unicast_packet->ttl--;
1177
1178         /* route it */
1179         send_skb_packet(skb, batman_if, dstaddr);
1180
1181         return NET_RX_SUCCESS;
1182 }
1183
1184 int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1185 {
1186         struct unicast_packet *unicast_packet;
1187         int hdr_size = sizeof(struct unicast_packet);
1188
1189         if (check_unicast_packet(skb, hdr_size) < 0)
1190                 return NET_RX_DROP;
1191
1192         unicast_packet = (struct unicast_packet *)skb->data;
1193
1194         /* packet for me */
1195         if (is_my_mac(unicast_packet->dest)) {
1196                 interface_rx(recv_if->soft_iface, skb, hdr_size);
1197                 return NET_RX_SUCCESS;
1198         }
1199
1200         return route_unicast_packet(skb, recv_if, hdr_size);
1201 }
1202
1203 int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
1204 {
1205         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1206         struct unicast_frag_packet *unicast_packet;
1207         struct orig_node *orig_node;
1208         struct frag_packet_list_entry *tmp_frag_entry;
1209         int hdr_size = sizeof(struct unicast_frag_packet);
1210         unsigned long flags;
1211
1212         if (check_unicast_packet(skb, hdr_size) < 0)
1213                 return NET_RX_DROP;
1214
1215         unicast_packet = (struct unicast_frag_packet *)skb->data;
1216
1217         /* packet for me */
1218         if (is_my_mac(unicast_packet->dest)) {
1219
1220                 spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
1221                 orig_node = ((struct orig_node *)
1222                         hash_find(bat_priv->orig_hash, unicast_packet->orig));
1223
1224                 if (!orig_node) {
1225                         pr_debug("couldn't find orig node for fragmentation\n");
1226                         spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
1227                                                flags);
1228                         return NET_RX_DROP;
1229                 }
1230
1231                 orig_node->last_frag_packet = jiffies;
1232
1233                 if (list_empty(&orig_node->frag_list) &&
1234                         create_frag_buffer(&orig_node->frag_list)) {
1235                         spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
1236                                                flags);
1237                         return NET_RX_DROP;
1238                 }
1239
1240                 tmp_frag_entry =
1241                         search_frag_packet(&orig_node->frag_list,
1242                                            unicast_packet);
1243
1244                 if (!tmp_frag_entry) {
1245                         create_frag_entry(&orig_node->frag_list, skb);
1246                         spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
1247                                                flags);
1248                         return NET_RX_SUCCESS;
1249                 }
1250
1251                 skb = merge_frag_packet(&orig_node->frag_list,
1252                                         tmp_frag_entry, skb);
1253                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1254                 if (!skb)
1255                         return NET_RX_DROP;
1256
1257                 interface_rx(recv_if->soft_iface, skb, hdr_size);
1258                 return NET_RX_SUCCESS;
1259         }
1260
1261         return route_unicast_packet(skb, recv_if, hdr_size);
1262 }
1263
1264
1265 int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1266 {
1267         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1268         struct orig_node *orig_node;
1269         struct bcast_packet *bcast_packet;
1270         struct ethhdr *ethhdr;
1271         int hdr_size = sizeof(struct bcast_packet);
1272         int32_t seq_diff;
1273         unsigned long flags;
1274
1275         /* drop packet if it has not necessary minimum size */
1276         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1277                 return NET_RX_DROP;
1278
1279         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1280
1281         /* packet with broadcast indication but unicast recipient */
1282         if (!is_bcast(ethhdr->h_dest))
1283                 return NET_RX_DROP;
1284
1285         /* packet with broadcast sender address */
1286         if (is_bcast(ethhdr->h_source))
1287                 return NET_RX_DROP;
1288
1289         /* ignore broadcasts sent by myself */
1290         if (is_my_mac(ethhdr->h_source))
1291                 return NET_RX_DROP;
1292
1293         bcast_packet = (struct bcast_packet *)skb->data;
1294
1295         /* ignore broadcasts originated by myself */
1296         if (is_my_mac(bcast_packet->orig))
1297                 return NET_RX_DROP;
1298
1299         if (bcast_packet->ttl < 2)
1300                 return NET_RX_DROP;
1301
1302         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
1303         orig_node = ((struct orig_node *)
1304                      hash_find(bat_priv->orig_hash, bcast_packet->orig));
1305
1306         if (orig_node == NULL) {
1307                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1308                 return NET_RX_DROP;
1309         }
1310
1311         /* check whether the packet is a duplicate */
1312         if (get_bit_status(orig_node->bcast_bits,
1313                            orig_node->last_bcast_seqno,
1314                            ntohl(bcast_packet->seqno))) {
1315                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1316                 return NET_RX_DROP;
1317         }
1318
1319         seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1320
1321         /* check whether the packet is old and the host just restarted. */
1322         if (window_protected(bat_priv, seq_diff,
1323                              &orig_node->bcast_seqno_reset)) {
1324                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1325                 return NET_RX_DROP;
1326         }
1327
1328         /* mark broadcast in flood history, update window position
1329          * if required. */
1330         if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1331                 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1332
1333         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1334         /* rebroadcast packet */
1335         add_bcast_packet_to_list(bat_priv, skb);
1336
1337         /* broadcast for me */
1338         interface_rx(recv_if->soft_iface, skb, hdr_size);
1339
1340         return NET_RX_SUCCESS;
1341 }
1342
1343 int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if)
1344 {
1345         struct vis_packet *vis_packet;
1346         struct ethhdr *ethhdr;
1347         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1348         int hdr_size = sizeof(struct vis_packet);
1349
1350         /* keep skb linear */
1351         if (skb_linearize(skb) < 0)
1352                 return NET_RX_DROP;
1353
1354         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1355                 return NET_RX_DROP;
1356
1357         vis_packet = (struct vis_packet *)skb->data;
1358         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1359
1360         /* not for me */
1361         if (!is_my_mac(ethhdr->h_dest))
1362                 return NET_RX_DROP;
1363
1364         /* ignore own packets */
1365         if (is_my_mac(vis_packet->vis_orig))
1366                 return NET_RX_DROP;
1367
1368         if (is_my_mac(vis_packet->sender_orig))
1369                 return NET_RX_DROP;
1370
1371         switch (vis_packet->vis_type) {
1372         case VIS_TYPE_SERVER_SYNC:
1373                 receive_server_sync_packet(bat_priv, vis_packet,
1374                                            skb_headlen(skb));
1375                 break;
1376
1377         case VIS_TYPE_CLIENT_UPDATE:
1378                 receive_client_update_packet(bat_priv, vis_packet,
1379                                              skb_headlen(skb));
1380                 break;
1381
1382         default:        /* ignore unknown packet */
1383                 break;
1384         }
1385
1386         /* We take a copy of the data in the packet, so we should
1387            always free the skbuf. */
1388         return NET_RX_DROP;
1389 }