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 [%s] "
 558                 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
 559                 "TTL %d, V %d, IDF %d)\n",
 560                 ethhdr->h_source, if_incoming->net_dev->name,
 561                 if_incoming->addr_str, 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         list_for_each_entry_rcu(batman_if, &if_list, list) {
 567                 if (batman_if->if_status != IF_ACTIVE)
 568                         continue;
 569
 570                 if (batman_if->soft_iface != if_incoming->soft_iface)
 571                         continue;
 572
 573                 if (compare_orig(ethhdr->h_source,
 574                                  batman_if->net_dev->dev_addr))
 575                         is_my_addr = 1;
 576
 577                 if (compare_orig(batman_packet->orig,
 578                                  batman_if->net_dev->dev_addr))
 579                         is_my_orig = 1;
 580
 581                 if (compare_orig(batman_packet->prev_sender,
 582                                  batman_if->net_dev->dev_addr))
 583                         is_my_oldorig = 1;
 584
 585                 if (compare_orig(ethhdr->h_source, broadcast_addr))
 586                         is_broadcast = 1;
 587         }
 588
 589         if (batman_packet->version != COMPAT_VERSION) {
 590                 bat_dbg(DBG_BATMAN, bat_priv,
 591                         "Drop packet: incompatible batman version (%i)\n",
 592                         batman_packet->version);
 593                 return;
 594         }
 595
 596         if (is_my_addr) {
 597                 bat_dbg(DBG_BATMAN, bat_priv,
 598                         "Drop packet: received my own broadcast (sender: %pM"
 599                         ")\n",
 600                         ethhdr->h_source);
 601                 return;
 602         }
 603
 604         if (is_broadcast) {
 605                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 606                 "ignoring all packets with broadcast source addr (sender: %pM"
 607                 ")\n", ethhdr->h_source);
 608                 return;
 609         }
 610
 611         if (is_my_orig) {
 612                 TYPE_OF_WORD *word;
 613                 int offset;
 614
 615                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
 616
 617                 if (!orig_neigh_node)
 618                         return;
 619
 620                 /* neighbor has to indicate direct link and it has to
 621                  * come via the corresponding interface */
 622                 /* if received seqno equals last send seqno save new
 623                  * seqno for bidirectional check */
 624                 if (has_directlink_flag &&
 625                     compare_orig(if_incoming->net_dev->dev_addr,
 626                                  batman_packet->orig) &&
 627                     (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
 628                         offset = if_incoming->if_num * NUM_WORDS;
 629                         word = &(orig_neigh_node->bcast_own[offset]);
 630                         bit_mark(word, 0);
 631                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
 632                                 bit_packet_count(word);
 633                 }
 634
 635                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 636                         "originator packet from myself (via neighbor)\n");
 637                 return;
 638         }
 639
 640         if (is_my_oldorig) {
 641                 bat_dbg(DBG_BATMAN, bat_priv,
 642                         "Drop packet: ignoring all rebroadcast echos (sender: "
 643                         "%pM)\n", ethhdr->h_source);
 644                 return;
 645         }
 646
 647         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 648         if (orig_node == NULL)
 649                 return;
 650
 651         is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
 652
 653         if (is_duplicate == -1) {
 654                 bat_dbg(DBG_BATMAN, bat_priv,
 655                         "Drop packet: packet within seqno protection time "
 656                         "(sender: %pM)\n", ethhdr->h_source);
 657                 return;
 658         }
 659
 660         if (batman_packet->tq == 0) {
 661                 bat_dbg(DBG_BATMAN, bat_priv,
 662                         "Drop packet: originator packet with tq equal 0\n");
 663                 return;
 664         }
 665
 666         /* avoid temporary routing loops */
 667         if ((orig_node->router) &&
 668             (orig_node->router->orig_node->router) &&
 669             (compare_orig(orig_node->router->addr,
 670                           batman_packet->prev_sender)) &&
 671             !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
 672             (compare_orig(orig_node->router->addr,
 673                           orig_node->router->orig_node->router->addr))) {
 674                 bat_dbg(DBG_BATMAN, bat_priv,
 675                         "Drop packet: ignoring all rebroadcast packets that "
 676                         "may make me loop (sender: %pM)\n", ethhdr->h_source);
 677                 return;
 678         }
 679
 680         /* if sender is a direct neighbor the sender mac equals
 681          * originator mac */
 682         orig_neigh_node = (is_single_hop_neigh ?
 683                            orig_node :
 684                            get_orig_node(bat_priv, ethhdr->h_source));
 685         if (orig_neigh_node == NULL)
 686                 return;
 687
 688         /* drop packet if sender is not a direct neighbor and if we
 689          * don't route towards it */
 690         if (!is_single_hop_neigh &&
 691             (orig_neigh_node->router == NULL)) {
 692                 bat_dbg(DBG_BATMAN, bat_priv,
 693                         "Drop packet: OGM via unknown neighbor!\n");
 694                 return;
 695         }
 696
 697         is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
 698                                                 batman_packet, if_incoming);
 699
 700         /* update ranking if it is not a duplicate or has the same
 701          * seqno and similar ttl as the non-duplicate */
 702         if (is_bidirectional &&
 703             (!is_duplicate ||
 704              ((orig_node->last_real_seqno == batman_packet->seqno) &&
 705               (orig_node->last_ttl - 3 <= batman_packet->ttl))))
 706                 update_orig(bat_priv, orig_node, ethhdr, batman_packet,
 707                             if_incoming, hna_buff, hna_buff_len, is_duplicate);
 708
 709         mark_bonding_address(bat_priv, orig_node,
 710                              orig_neigh_node, batman_packet);
 711         update_bonding_candidates(bat_priv, orig_node);
 712
 713         /* is single hop (direct) neighbor */
 714         if (is_single_hop_neigh) {
 715
 716                 /* mark direct link on incoming interface */
 717                 schedule_forward_packet(orig_node, ethhdr, batman_packet,
 718                                         1, hna_buff_len, if_incoming);
 719
 720                 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
 721                         "rebroadcast neighbor packet with direct link flag\n");
 722                 return;
 723         }
 724
 725         /* multihop originator */
 726         if (!is_bidirectional) {
 727                 bat_dbg(DBG_BATMAN, bat_priv,
 728                         "Drop packet: not received via bidirectional link\n");
 729                 return;
 730         }
 731
 732         if (is_duplicate) {
 733                 bat_dbg(DBG_BATMAN, bat_priv,
 734                         "Drop packet: duplicate packet received\n");
 735                 return;
 736         }
 737
 738         bat_dbg(DBG_BATMAN, bat_priv,
 739                 "Forwarding packet: rebroadcast originator packet\n");
 740         schedule_forward_packet(orig_node, ethhdr, batman_packet,
 741                                 0, hna_buff_len, if_incoming);
 742 }
 743
 744 int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
 745 {
 746         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 747         struct ethhdr *ethhdr;
 748         unsigned long flags;
 749
 750         /* drop packet if it has not necessary minimum size */
 751         if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
 752                 return NET_RX_DROP;
 753
 754         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 755
 756         /* packet with broadcast indication but unicast recipient */
 757         if (!is_bcast(ethhdr->h_dest))
 758                 return NET_RX_DROP;
 759
 760         /* packet with broadcast sender address */
 761         if (is_bcast(ethhdr->h_source))
 762                 return NET_RX_DROP;
 763
 764         /* create a copy of the skb, if needed, to modify it. */
 765         if (skb_cow(skb, 0) < 0)
 766                 return NET_RX_DROP;
 767
 768         /* keep skb linear */
 769         if (skb_linearize(skb) < 0)
 770                 return NET_RX_DROP;
 771
 772         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 773
 774         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 775         receive_aggr_bat_packet(ethhdr,
 776                                 skb->data,
 777                                 skb_headlen(skb),
 778                                 batman_if);
 779         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 780
 781         kfree_skb(skb);
 782         return NET_RX_SUCCESS;
 783 }
 784
 785 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
 786                                struct sk_buff *skb, size_t icmp_len)
 787 {
 788         struct orig_node *orig_node;
 789         struct icmp_packet_rr *icmp_packet;
 790         struct ethhdr *ethhdr;
 791         struct batman_if *batman_if;
 792         int ret;
 793         unsigned long flags;
 794         uint8_t dstaddr[ETH_ALEN];
 795
 796         icmp_packet = (struct icmp_packet_rr *)skb->data;
 797         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 798
 799         /* add data to device queue */
 800         if (icmp_packet->msg_type != ECHO_REQUEST) {
 801                 bat_socket_receive_packet(icmp_packet, icmp_len);
 802                 return NET_RX_DROP;
 803         }
 804
 805         if (!bat_priv->primary_if)
 806                 return NET_RX_DROP;
 807
 808         /* answer echo request (ping) */
 809         /* get routing information */
 810         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 811         orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
 812                                                    icmp_packet->orig));
 813         ret = NET_RX_DROP;
 814
 815         if ((orig_node != NULL) &&
 816             (orig_node->router != NULL)) {
 817
 818                 /* don't lock while sending the packets ... we therefore
 819                  * copy the required data before sending */
 820                 batman_if = orig_node->router->if_incoming;
 821                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 822                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 823
 824                 /* create a copy of the skb, if needed, to modify it. */
 825                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 826                         return NET_RX_DROP;
 827
 828                 icmp_packet = (struct icmp_packet_rr *)skb->data;
 829                 ethhdr = (struct ethhdr *)skb_mac_header(skb);
 830
 831                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 832                 memcpy(icmp_packet->orig,
 833                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 834                 icmp_packet->msg_type = ECHO_REPLY;
 835                 icmp_packet->ttl = TTL;
 836
 837                 send_skb_packet(skb, batman_if, dstaddr);
 838                 ret = NET_RX_SUCCESS;
 839
 840         } else
 841                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 842
 843         return ret;
 844 }
 845
 846 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
 847                                   struct sk_buff *skb, size_t icmp_len)
 848 {
 849         struct orig_node *orig_node;
 850         struct icmp_packet *icmp_packet;
 851         struct ethhdr *ethhdr;
 852         struct batman_if *batman_if;
 853         int ret;
 854         unsigned long flags;
 855         uint8_t dstaddr[ETH_ALEN];
 856
 857         icmp_packet = (struct icmp_packet *)skb->data;
 858         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 859
 860         /* send TTL exceeded if packet is an echo request (traceroute) */
 861         if (icmp_packet->msg_type != ECHO_REQUEST) {
 862                 pr_debug("Warning - can't forward icmp packet from %pM to "
 863                          "%pM: ttl exceeded\n", icmp_packet->orig,
 864                          icmp_packet->dst);
 865                 return NET_RX_DROP;
 866         }
 867
 868         if (!bat_priv->primary_if)
 869                 return NET_RX_DROP;
 870
 871         /* get routing information */
 872         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 873         orig_node = ((struct orig_node *)
 874                      hash_find(bat_priv->orig_hash, icmp_packet->orig));
 875         ret = NET_RX_DROP;
 876
 877         if ((orig_node != NULL) &&
 878             (orig_node->router != NULL)) {
 879
 880                 /* don't lock while sending the packets ... we therefore
 881                  * copy the required data before sending */
 882                 batman_if = orig_node->router->if_incoming;
 883                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 884                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 885
 886                 /* create a copy of the skb, if needed, to modify it. */
 887                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 888                         return NET_RX_DROP;
 889
 890                 icmp_packet = (struct icmp_packet *) skb->data;
 891                 ethhdr = (struct ethhdr *)skb_mac_header(skb);
 892
 893                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 894                 memcpy(icmp_packet->orig,
 895                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 896                 icmp_packet->msg_type = TTL_EXCEEDED;
 897                 icmp_packet->ttl = TTL;
 898
 899                 send_skb_packet(skb, batman_if, dstaddr);
 900                 ret = NET_RX_SUCCESS;
 901
 902         } else
 903                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 904
 905         return ret;
 906 }
 907
 908
 909 int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
 910 {
 911         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
 912         struct icmp_packet_rr *icmp_packet;
 913         struct ethhdr *ethhdr;
 914         struct orig_node *orig_node;
 915         struct batman_if *batman_if;
 916         int hdr_size = sizeof(struct icmp_packet);
 917         int ret;
 918         unsigned long flags;
 919         uint8_t dstaddr[ETH_ALEN];
 920
 921         /**
 922          * we truncate all incoming icmp packets if they don't match our size
 923          */
 924         if (skb->len >= sizeof(struct icmp_packet_rr))
 925                 hdr_size = sizeof(struct icmp_packet_rr);
 926
 927         /* drop packet if it has not necessary minimum size */
 928         if (unlikely(!pskb_may_pull(skb, hdr_size)))
 929                 return NET_RX_DROP;
 930
 931         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 932
 933         /* packet with unicast indication but broadcast recipient */
 934         if (is_bcast(ethhdr->h_dest))
 935                 return NET_RX_DROP;
 936
 937         /* packet with broadcast sender address */
 938         if (is_bcast(ethhdr->h_source))
 939                 return NET_RX_DROP;
 940
 941         /* not for me */
 942         if (!is_my_mac(ethhdr->h_dest))
 943                 return NET_RX_DROP;
 944
 945         icmp_packet = (struct icmp_packet_rr *)skb->data;
 946
 947         /* add record route information if not full */
 948         if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
 949             (icmp_packet->rr_cur < BAT_RR_LEN)) {
 950                 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
 951                         ethhdr->h_dest, ETH_ALEN);
 952                 icmp_packet->rr_cur++;
 953         }
 954
 955         /* packet for me */
 956         if (is_my_mac(icmp_packet->dst))
 957                 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
 958
 959         /* TTL exceeded */
 960         if (icmp_packet->ttl < 2)
 961                 return recv_icmp_ttl_exceeded(bat_priv, skb, hdr_size);
 962
 963         ret = NET_RX_DROP;
 964
 965         /* get routing information */
 966         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
 967         orig_node = ((struct orig_node *)
 968                      hash_find(bat_priv->orig_hash, icmp_packet->dst));
 969
 970         if ((orig_node != NULL) &&
 971             (orig_node->router != NULL)) {
 972
 973                 /* don't lock while sending the packets ... we therefore
 974                  * copy the required data before sending */
 975                 batman_if = orig_node->router->if_incoming;
 976                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 977                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 978
 979                 /* create a copy of the skb, if needed, to modify it. */
 980                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 981                         return NET_RX_DROP;
 982
 983                 icmp_packet = (struct icmp_packet_rr *)skb->data;
 984                 ethhdr = (struct ethhdr *)skb_mac_header(skb);
 985
 986                 /* decrement ttl */
 987                 icmp_packet->ttl--;
 988
 989                 /* route it */
 990                 send_skb_packet(skb, batman_if, dstaddr);
 991                 ret = NET_RX_SUCCESS;
 992
 993         } else
 994                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
 995
 996         return ret;
 997 }
 998
 999 /* find a suitable router for this originator, and use
1000  * bonding if possible. */
1001 struct neigh_node *find_router(struct orig_node *orig_node,
1002                                struct batman_if *recv_if)
1003 {
1004         struct bat_priv *bat_priv;
1005         struct orig_node *primary_orig_node;
1006         struct orig_node *router_orig;
1007         struct neigh_node *router, *first_candidate, *best_router;
1008         static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1009         int bonding_enabled;
1010
1011         if (!orig_node)
1012                 return NULL;
1013
1014         if (!orig_node->router)
1015                 return NULL;
1016
1017         /* without bonding, the first node should
1018          * always choose the default router. */
1019
1020         if (!recv_if)
1021                 return orig_node->router;
1022
1023         bat_priv = netdev_priv(recv_if->soft_iface);
1024         bonding_enabled = atomic_read(&bat_priv->bonding_enabled);
1025
1026         if (!bonding_enabled)
1027                 return orig_node->router;
1028
1029         router_orig = orig_node->router->orig_node;
1030
1031         /* if we have something in the primary_addr, we can search
1032          * for a potential bonding candidate. */
1033         if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
1034                 return orig_node->router;
1035
1036         /* find the orig_node which has the primary interface. might
1037          * even be the same as our router_orig in many cases */
1038
1039         if (memcmp(router_orig->primary_addr,
1040                                 router_orig->orig, ETH_ALEN) == 0) {
1041                 primary_orig_node = router_orig;
1042         } else {
1043                 primary_orig_node = hash_find(bat_priv->orig_hash,
1044                                                 router_orig->primary_addr);
1045
1046                 if (!primary_orig_node)
1047                         return orig_node->router;
1048         }
1049
1050         /* with less than 2 candidates, we can't do any
1051          * bonding and prefer the original router. */
1052
1053         if (primary_orig_node->bond.candidates < 2)
1054                 return orig_node->router;
1055
1056
1057         /* all nodes between should choose a candidate which
1058          * is is not on the interface where the packet came
1059          * in. */
1060         first_candidate = primary_orig_node->bond.selected;
1061         router = first_candidate;
1062
1063         if (bonding_enabled) {
1064                 /* in the bonding case, send the packets in a round
1065                  * robin fashion over the remaining interfaces. */
1066                 do {
1067                         /* recv_if == NULL on the first node. */
1068                         if (router->if_incoming != recv_if)
1069                                 break;
1070
1071                         router = router->next_bond_candidate;
1072                 } while (router != first_candidate);
1073
1074                 primary_orig_node->bond.selected = router->next_bond_candidate;
1075
1076         } else {
1077                 /* if bonding is disabled, use the best of the
1078                  * remaining candidates which are not using
1079                  * this interface. */
1080                 best_router = first_candidate;
1081
1082                 do {
1083                         /* recv_if == NULL on the first node. */
1084                         if ((router->if_incoming != recv_if) &&
1085                                 (router->tq_avg > best_router->tq_avg))
1086                                         best_router = router;
1087
1088                         router = router->next_bond_candidate;
1089                 } while (router != first_candidate);
1090
1091                 router = best_router;
1092         }
1093
1094         return router;
1095 }
1096
1097 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1098 {
1099         struct ethhdr *ethhdr;
1100
1101         /* drop packet if it has not necessary minimum size */
1102         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1103                 return -1;
1104
1105         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1106
1107         /* packet with unicast indication but broadcast recipient */
1108         if (is_bcast(ethhdr->h_dest))
1109                 return -1;
1110
1111         /* packet with broadcast sender address */
1112         if (is_bcast(ethhdr->h_source))
1113                 return -1;
1114
1115         /* not for me */
1116         if (!is_my_mac(ethhdr->h_dest))
1117                 return -1;
1118
1119         return 0;
1120 }
1121
1122 static int route_unicast_packet(struct sk_buff *skb,
1123                                 struct batman_if *recv_if, int hdr_size)
1124 {
1125         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1126         struct orig_node *orig_node;
1127         struct neigh_node *router;
1128         struct batman_if *batman_if;
1129         uint8_t dstaddr[ETH_ALEN];
1130         unsigned long flags;
1131         struct unicast_packet *unicast_packet;
1132         struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
1133
1134         unicast_packet = (struct unicast_packet *)skb->data;
1135
1136         /* packet for me */
1137         if (is_my_mac(unicast_packet->dest)) {
1138                 interface_rx(recv_if->soft_iface, skb, hdr_size);
1139                 return NET_RX_SUCCESS;
1140         }
1141
1142         /* TTL exceeded */
1143         if (unicast_packet->ttl < 2) {
1144                 pr_debug("Warning - can't forward unicast packet from %pM to "
1145                          "%pM: ttl exceeded\n", ethhdr->h_source,
1146                          unicast_packet->dest);
1147                 return NET_RX_DROP;
1148         }
1149
1150         /* get routing information */
1151         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
1152         orig_node = ((struct orig_node *)
1153                      hash_find(bat_priv->orig_hash, unicast_packet->dest));
1154
1155         router = find_router(orig_node, recv_if);
1156
1157         if (!router) {
1158                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1159                 return NET_RX_DROP;
1160         }
1161
1162         /* don't lock while sending the packets ... we therefore
1163          * copy the required data before sending */
1164
1165         batman_if = router->if_incoming;
1166         memcpy(dstaddr, router->addr, ETH_ALEN);
1167
1168         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1169
1170         /* create a copy of the skb, if needed, to modify it. */
1171         if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1172                 return NET_RX_DROP;
1173
1174         unicast_packet = (struct unicast_packet *)skb->data;
1175         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1176
1177         /* decrement ttl */
1178         unicast_packet->ttl--;
1179
1180         /* route it */
1181         send_skb_packet(skb, batman_if, dstaddr);
1182
1183         return NET_RX_SUCCESS;
1184 }
1185
1186 int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1187 {
1188         struct unicast_packet *unicast_packet;
1189         int hdr_size = sizeof(struct unicast_packet);
1190
1191         if (check_unicast_packet(skb, hdr_size) < 0)
1192                 return NET_RX_DROP;
1193
1194         unicast_packet = (struct unicast_packet *)skb->data;
1195
1196         /* packet for me */
1197         if (is_my_mac(unicast_packet->dest)) {
1198                 interface_rx(recv_if->soft_iface, skb, hdr_size);
1199                 return NET_RX_SUCCESS;
1200         }
1201
1202         return route_unicast_packet(skb, recv_if, hdr_size);
1203 }
1204
1205 int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
1206 {
1207         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1208         struct unicast_frag_packet *unicast_packet;
1209         struct orig_node *orig_node;
1210         struct frag_packet_list_entry *tmp_frag_entry;
1211         int hdr_size = sizeof(struct unicast_frag_packet);
1212         unsigned long flags;
1213
1214         if (check_unicast_packet(skb, hdr_size) < 0)
1215                 return NET_RX_DROP;
1216
1217         unicast_packet = (struct unicast_frag_packet *)skb->data;
1218
1219         /* packet for me */
1220         if (is_my_mac(unicast_packet->dest)) {
1221
1222                 spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
1223                 orig_node = ((struct orig_node *)
1224                         hash_find(bat_priv->orig_hash, unicast_packet->orig));
1225
1226                 if (!orig_node) {
1227                         pr_debug("couldn't find orig node for fragmentation\n");
1228                         spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
1229                                                flags);
1230                         return NET_RX_DROP;
1231                 }
1232
1233                 orig_node->last_frag_packet = jiffies;
1234
1235                 if (list_empty(&orig_node->frag_list) &&
1236                         create_frag_buffer(&orig_node->frag_list)) {
1237                         spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
1238                                                flags);
1239                         return NET_RX_DROP;
1240                 }
1241
1242                 tmp_frag_entry =
1243                         search_frag_packet(&orig_node->frag_list,
1244                                            unicast_packet);
1245
1246                 if (!tmp_frag_entry) {
1247                         create_frag_entry(&orig_node->frag_list, skb);
1248                         spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
1249                                                flags);
1250                         return NET_RX_SUCCESS;
1251                 }
1252
1253                 skb = merge_frag_packet(&orig_node->frag_list,
1254                                         tmp_frag_entry, skb);
1255                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1256                 if (!skb)
1257                         return NET_RX_DROP;
1258
1259                 interface_rx(recv_if->soft_iface, skb, hdr_size);
1260                 return NET_RX_SUCCESS;
1261         }
1262
1263         return route_unicast_packet(skb, recv_if, hdr_size);
1264 }
1265
1266
1267 int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1268 {
1269         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1270         struct orig_node *orig_node;
1271         struct bcast_packet *bcast_packet;
1272         struct ethhdr *ethhdr;
1273         int hdr_size = sizeof(struct bcast_packet);
1274         int32_t seq_diff;
1275         unsigned long flags;
1276
1277         /* drop packet if it has not necessary minimum size */
1278         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1279                 return NET_RX_DROP;
1280
1281         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1282
1283         /* packet with broadcast indication but unicast recipient */
1284         if (!is_bcast(ethhdr->h_dest))
1285                 return NET_RX_DROP;
1286
1287         /* packet with broadcast sender address */
1288         if (is_bcast(ethhdr->h_source))
1289                 return NET_RX_DROP;
1290
1291         /* ignore broadcasts sent by myself */
1292         if (is_my_mac(ethhdr->h_source))
1293                 return NET_RX_DROP;
1294
1295         bcast_packet = (struct bcast_packet *)skb->data;
1296
1297         /* ignore broadcasts originated by myself */
1298         if (is_my_mac(bcast_packet->orig))
1299                 return NET_RX_DROP;
1300
1301         if (bcast_packet->ttl < 2)
1302                 return NET_RX_DROP;
1303
1304         spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
1305         orig_node = ((struct orig_node *)
1306                      hash_find(bat_priv->orig_hash, bcast_packet->orig));
1307
1308         if (orig_node == NULL) {
1309                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1310                 return NET_RX_DROP;
1311         }
1312
1313         /* check whether the packet is a duplicate */
1314         if (get_bit_status(orig_node->bcast_bits,
1315                            orig_node->last_bcast_seqno,
1316                            ntohl(bcast_packet->seqno))) {
1317                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1318                 return NET_RX_DROP;
1319         }
1320
1321         seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1322
1323         /* check whether the packet is old and the host just restarted. */
1324         if (window_protected(bat_priv, seq_diff,
1325                              &orig_node->bcast_seqno_reset)) {
1326                 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1327                 return NET_RX_DROP;
1328         }
1329
1330         /* mark broadcast in flood history, update window position
1331          * if required. */
1332         if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1333                 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1334
1335         spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1336         /* rebroadcast packet */
1337         add_bcast_packet_to_list(bat_priv, skb);
1338
1339         /* broadcast for me */
1340         interface_rx(recv_if->soft_iface, skb, hdr_size);
1341
1342         return NET_RX_SUCCESS;
1343 }
1344
1345 int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if)
1346 {
1347         struct vis_packet *vis_packet;
1348         struct ethhdr *ethhdr;
1349         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1350         int hdr_size = sizeof(struct vis_packet);
1351
1352         /* keep skb linear */
1353         if (skb_linearize(skb) < 0)
1354                 return NET_RX_DROP;
1355
1356         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1357                 return NET_RX_DROP;
1358
1359         vis_packet = (struct vis_packet *)skb->data;
1360         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1361
1362         /* not for me */
1363         if (!is_my_mac(ethhdr->h_dest))
1364                 return NET_RX_DROP;
1365
1366         /* ignore own packets */
1367         if (is_my_mac(vis_packet->vis_orig))
1368                 return NET_RX_DROP;
1369
1370         if (is_my_mac(vis_packet->sender_orig))
1371                 return NET_RX_DROP;
1372
1373         switch (vis_packet->vis_type) {
1374         case VIS_TYPE_SERVER_SYNC:
1375                 receive_server_sync_packet(bat_priv, vis_packet,
1376                                            skb_headlen(skb));
1377                 break;
1378
1379         case VIS_TYPE_CLIENT_UPDATE:
1380                 receive_client_update_packet(bat_priv, vis_packet,
1381                                              skb_headlen(skb));
1382                 break;
1383
1384         default:        /* ignore unknown packet */
1385                 break;
1386         }
1387
1388         /* We take a copy of the data in the packet, so we should
1389            always free the skbuf. */
1390         return NET_RX_DROP;
1391 }