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 static DECLARE_WAIT_QUEUE_HEAD(thread_wait);
  38
  39 void slide_own_bcast_window(struct batman_if *batman_if)
  40 {
  41         HASHIT(hashit);
  42         struct orig_node *orig_node;
  43         TYPE_OF_WORD *word;
  44         unsigned long flags;
  45
  46         spin_lock_irqsave(&orig_hash_lock, flags);
  47
  48         while (hash_iterate(orig_hash, &hashit)) {
  49                 orig_node = hashit.bucket->data;
  50                 word = &(orig_node->bcast_own[batman_if->if_num * NUM_WORDS]);
  51
  52                 bit_get_packet(word, 1, 0);
  53                 orig_node->bcast_own_sum[batman_if->if_num] =
  54                         bit_packet_count(word);
  55         }
  56
  57         spin_unlock_irqrestore(&orig_hash_lock, flags);
  58 }
  59
  60 static void update_HNA(struct orig_node *orig_node,
  61                        unsigned char *hna_buff, int hna_buff_len)
  62 {
  63         if ((hna_buff_len != orig_node->hna_buff_len) ||
  64             ((hna_buff_len > 0) &&
  65              (orig_node->hna_buff_len > 0) &&
  66              (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
  67
  68                 if (orig_node->hna_buff_len > 0)
  69                         hna_global_del_orig(orig_node,
  70                                             "originator changed hna");
  71
  72                 if ((hna_buff_len > 0) && (hna_buff != NULL))
  73                         hna_global_add_orig(orig_node, hna_buff, hna_buff_len);
  74         }
  75 }
  76
  77 static void update_route(struct orig_node *orig_node,
  78                          struct neigh_node *neigh_node,
  79                          unsigned char *hna_buff, int hna_buff_len)
  80 {
  81         /* FIXME: each orig_node->batman_if will be attached to a softif */
  82         struct bat_priv *bat_priv = netdev_priv(soft_device);
  83
  84         /* route deleted */
  85         if ((orig_node->router != NULL) && (neigh_node == NULL)) {
  86
  87                 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
  88                         orig_node->orig);
  89                 hna_global_del_orig(orig_node, "originator timed out");
  90
  91                 /* route added */
  92         } else if ((orig_node->router == NULL) && (neigh_node != NULL)) {
  93
  94                 bat_dbg(DBG_ROUTES, bat_priv,
  95                         "Adding route towards: %pM (via %pM)\n",
  96                         orig_node->orig, neigh_node->addr);
  97                 hna_global_add_orig(orig_node, 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 orig_node *orig_node,
 113                           struct neigh_node *neigh_node,
 114                           unsigned char *hna_buff, int hna_buff_len)
 115 {
 116
 117         if (orig_node == NULL)
 118                 return;
 119
 120         if (orig_node->router != neigh_node)
 121                 update_route(orig_node, neigh_node, hna_buff, hna_buff_len);
 122         /* may be just HNA changed */
 123         else
 124                 update_HNA(orig_node, hna_buff, hna_buff_len);
 125 }
 126
 127 static int is_bidirectional_neigh(struct orig_node *orig_node,
 128                                 struct orig_node *orig_neigh_node,
 129                                 struct batman_packet *batman_packet,
 130                                 struct batman_if *if_incoming)
 131 {
 132         /* FIXME: each orig_node->batman_if will be attached to a softif */
 133         struct bat_priv *bat_priv = netdev_priv(soft_device);
 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 orig_node *orig_node, struct ethhdr *ethhdr,
 238                         struct batman_packet *batman_packet,
 239                         struct batman_if *if_incoming,
 240                         unsigned char *hna_buff, int hna_buff_len,
 241                         char is_duplicate)
 242 {
 243         /* FIXME: get bat_priv */
 244         struct bat_priv *bat_priv = netdev_priv(soft_device);
 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(ethhdr->h_source);
 271                 if (!orig_tmp)
 272                         return;
 273
 274                 neigh_node = create_neighbor(orig_node,
 275                                              orig_tmp,
 276                                              ethhdr->h_source, if_incoming);
 277                 if (!neigh_node)
 278                         return;
 279         } else
 280                 bat_dbg(DBG_BATMAN, bat_priv,
 281                         "Updating existing last-hop neighbor of originator\n");
 282
 283         orig_node->flags = batman_packet->flags;
 284         neigh_node->last_valid = jiffies;
 285
 286         ring_buffer_set(neigh_node->tq_recv,
 287                         &neigh_node->tq_index,
 288                         batman_packet->tq);
 289         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 290
 291         if (!is_duplicate) {
 292                 orig_node->last_ttl = batman_packet->ttl;
 293                 neigh_node->last_ttl = batman_packet->ttl;
 294         }
 295
 296         tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
 297                             batman_packet->num_hna * ETH_ALEN : hna_buff_len);
 298
 299         /* if this neighbor already is our next hop there is nothing
 300          * to change */
 301         if (orig_node->router == neigh_node)
 302                 goto update_hna;
 303
 304         /* if this neighbor does not offer a better TQ we won't consider it */
 305         if ((orig_node->router) &&
 306             (orig_node->router->tq_avg > neigh_node->tq_avg))
 307                 goto update_hna;
 308
 309         /* if the TQ is the same and the link not more symetric we
 310          * won't consider it either */
 311         if ((orig_node->router) &&
 312              ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
 313              (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
 314               >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
 315                 goto update_hna;
 316
 317         update_routes(orig_node, neigh_node, hna_buff, tmp_hna_buff_len);
 318         return;
 319
 320 update_hna:
 321         update_routes(orig_node, orig_node->router, hna_buff, tmp_hna_buff_len);
 322 }
 323
 324 /* checks whether the host restarted and is in the protection time.
 325  * returns:
 326  *  0 if the packet is to be accepted
 327  *  1 if the packet is to be ignored.
 328  */
 329 static int window_protected(int32_t seq_num_diff,
 330                                 unsigned long *last_reset)
 331 {
 332         /* FIXME: each orig_node->batman_if will be attached to a softif */
 333         struct bat_priv *bat_priv = netdev_priv(soft_device);
 334
 335         if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
 336                 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
 337                 if (time_after(jiffies, *last_reset +
 338                         msecs_to_jiffies(RESET_PROTECTION_MS))) {
 339
 340                         *last_reset = jiffies;
 341                         bat_dbg(DBG_BATMAN, bat_priv,
 342                                 "old packet received, start protection\n");
 343
 344                         return 0;
 345                 } else
 346                         return 1;
 347         }
 348         return 0;
 349 }
 350
 351 /* processes a batman packet for all interfaces, adjusts the sequence number and
 352  * finds out whether it is a duplicate.
 353  * returns:
 354  *   1 the packet is a duplicate
 355  *   0 the packet has not yet been received
 356  *  -1 the packet is old and has been received while the seqno window
 357  *     was protected. Caller should drop it.
 358  */
 359 static char count_real_packets(struct ethhdr *ethhdr,
 360                                struct batman_packet *batman_packet,
 361                                struct batman_if *if_incoming)
 362 {
 363         /* FIXME: each orig_node->batman_if will be attached to a softif */
 364         struct bat_priv *bat_priv = netdev_priv(soft_device);
 365         struct orig_node *orig_node;
 366         struct neigh_node *tmp_neigh_node;
 367         char is_duplicate = 0;
 368         int32_t seq_diff;
 369         int need_update = 0;
 370         int set_mark;
 371
 372         orig_node = get_orig_node(batman_packet->orig);
 373         if (orig_node == NULL)
 374                 return 0;
 375
 376         seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
 377
 378         /* signalize caller that the packet is to be dropped. */
 379         if (window_protected(seq_diff, &orig_node->batman_seqno_reset))
 380                 return -1;
 381
 382         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 383
 384                 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
 385                                                orig_node->last_real_seqno,
 386                                                batman_packet->seqno);
 387
 388                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 389                     (tmp_neigh_node->if_incoming == if_incoming))
 390                         set_mark = 1;
 391                 else
 392                         set_mark = 0;
 393
 394                 /* if the window moved, set the update flag. */
 395                 need_update |= bit_get_packet(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         /* FIXME: each orig_node->batman_if will be attached to a softif */
 525         struct bat_priv *bat_priv = netdev_priv(soft_device);
 526         struct batman_if *batman_if;
 527         struct orig_node *orig_neigh_node, *orig_node;
 528         char has_directlink_flag;
 529         char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 530         char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 531         char is_duplicate;
 532         uint32_t if_incoming_seqno;
 533
 534         /* Silently drop when the batman packet is actually not a
 535          * correct packet.
 536          *
 537          * This might happen if a packet is padded (e.g. Ethernet has a
 538          * minimum frame length of 64 byte) and the aggregation interprets
 539          * it as an additional length.
 540          *
 541          * TODO: A more sane solution would be to have a bit in the
 542          * batman_packet to detect whether the packet is the last
 543          * packet in an aggregation.  Here we expect that the padding
 544          * is always zero (or not 0x01)
 545          */
 546         if (batman_packet->packet_type != BAT_PACKET)
 547                 return;
 548
 549         /* could be changed by schedule_own_packet() */
 550         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 551
 552         has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
 553
 554         is_single_hop_neigh = (compare_orig(ethhdr->h_source,
 555                                             batman_packet->orig) ? 1 : 0);
 556
 557         bat_dbg(DBG_BATMAN, bat_priv,
 558                 "Received BATMAN packet via NB: %pM, IF: %s [%s] "
 559                 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
 560                 "TTL %d, V %d, IDF %d)\n",
 561                 ethhdr->h_source, if_incoming->dev, if_incoming->addr_str,
 562                 batman_packet->orig, batman_packet->prev_sender,
 563                 batman_packet->seqno, batman_packet->tq, batman_packet->ttl,
 564                 batman_packet->version, 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 (compare_orig(ethhdr->h_source,
 571                                  batman_if->net_dev->dev_addr))
 572                         is_my_addr = 1;
 573
 574                 if (compare_orig(batman_packet->orig,
 575                                  batman_if->net_dev->dev_addr))
 576                         is_my_orig = 1;
 577
 578                 if (compare_orig(batman_packet->prev_sender,
 579                                  batman_if->net_dev->dev_addr))
 580                         is_my_oldorig = 1;
 581
 582                 if (compare_orig(ethhdr->h_source, broadcast_addr))
 583                         is_broadcast = 1;
 584         }
 585
 586         if (batman_packet->version != COMPAT_VERSION) {
 587                 bat_dbg(DBG_BATMAN, bat_priv,
 588                         "Drop packet: incompatible batman version (%i)\n",
 589                         batman_packet->version);
 590                 return;
 591         }
 592
 593         if (is_my_addr) {
 594                 bat_dbg(DBG_BATMAN, bat_priv,
 595                         "Drop packet: received my own broadcast (sender: %pM"
 596                         ")\n",
 597                         ethhdr->h_source);
 598                 return;
 599         }
 600
 601         if (is_broadcast) {
 602                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 603                 "ignoring all packets with broadcast source addr (sender: %pM"
 604                 ")\n", ethhdr->h_source);
 605                 return;
 606         }
 607
 608         if (is_my_orig) {
 609                 TYPE_OF_WORD *word;
 610                 int offset;
 611
 612                 orig_neigh_node = get_orig_node(ethhdr->h_source);
 613
 614                 if (!orig_neigh_node)
 615                         return;
 616
 617                 /* neighbor has to indicate direct link and it has to
 618                  * come via the corresponding interface */
 619                 /* if received seqno equals last send seqno save new
 620                  * seqno for bidirectional check */
 621                 if (has_directlink_flag &&
 622                     compare_orig(if_incoming->net_dev->dev_addr,
 623                                  batman_packet->orig) &&
 624                     (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
 625                         offset = if_incoming->if_num * NUM_WORDS;
 626                         word = &(orig_neigh_node->bcast_own[offset]);
 627                         bit_mark(word, 0);
 628                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
 629                                 bit_packet_count(word);
 630                 }
 631
 632                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 633                         "originator packet from myself (via neighbor)\n");
 634                 return;
 635         }
 636
 637         if (is_my_oldorig) {
 638                 bat_dbg(DBG_BATMAN, bat_priv,
 639                         "Drop packet: ignoring all rebroadcast echos (sender: "
 640                         "%pM)\n", ethhdr->h_source);
 641                 return;
 642         }
 643
 644         orig_node = get_orig_node(batman_packet->orig);
 645         if (orig_node == NULL)
 646                 return;
 647
 648         is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
 649
 650         if (is_duplicate == -1) {
 651                 bat_dbg(DBG_BATMAN, bat_priv,
 652                         "Drop packet: packet within seqno protection time "
 653                         "(sender: %pM)\n", ethhdr->h_source);
 654                 return;
 655         }
 656
 657         if (batman_packet->tq == 0) {
 658                 bat_dbg(DBG_BATMAN, bat_priv,
 659                         "Drop packet: originator packet with tq equal 0\n");
 660                 return;
 661         }
 662
 663         /* avoid temporary routing loops */
 664         if ((orig_node->router) &&
 665             (orig_node->router->orig_node->router) &&
 666             (compare_orig(orig_node->router->addr,
 667                           batman_packet->prev_sender)) &&
 668             !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
 669             (compare_orig(orig_node->router->addr,
 670                           orig_node->router->orig_node->router->addr))) {
 671                 bat_dbg(DBG_BATMAN, bat_priv,
 672                         "Drop packet: ignoring all rebroadcast packets that "
 673                         "may make me loop (sender: %pM)\n", ethhdr->h_source);
 674                 return;
 675         }
 676
 677         /* if sender is a direct neighbor the sender mac equals
 678          * originator mac */
 679         orig_neigh_node = (is_single_hop_neigh ?
 680                            orig_node : get_orig_node(ethhdr->h_source));
 681         if (orig_neigh_node == NULL)
 682                 return;
 683
 684         /* drop packet if sender is not a direct neighbor and if we
 685          * don't route towards it */
 686         if (!is_single_hop_neigh &&
 687             (orig_neigh_node->router == NULL)) {
 688                 bat_dbg(DBG_BATMAN, bat_priv,
 689                         "Drop packet: OGM via unknown neighbor!\n");
 690                 return;
 691         }
 692
 693         is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
 694                                                 batman_packet, if_incoming);
 695
 696         /* update ranking if it is not a duplicate or has the same
 697          * seqno and similar ttl as the non-duplicate */
 698         if (is_bidirectional &&
 699             (!is_duplicate ||
 700              ((orig_node->last_real_seqno == batman_packet->seqno) &&
 701               (orig_node->last_ttl - 3 <= batman_packet->ttl))))
 702                 update_orig(orig_node, ethhdr, batman_packet,
 703                             if_incoming, hna_buff, hna_buff_len, is_duplicate);
 704
 705         mark_bonding_address(bat_priv, orig_node,
 706                              orig_neigh_node, batman_packet);
 707         update_bonding_candidates(bat_priv, orig_node);
 708
 709         /* is single hop (direct) neighbor */
 710         if (is_single_hop_neigh) {
 711
 712                 /* mark direct link on incoming interface */
 713                 schedule_forward_packet(orig_node, ethhdr, batman_packet,
 714                                         1, hna_buff_len, if_incoming);
 715
 716                 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
 717                         "rebroadcast neighbor packet with direct link flag\n");
 718                 return;
 719         }
 720
 721         /* multihop originator */
 722         if (!is_bidirectional) {
 723                 bat_dbg(DBG_BATMAN, bat_priv,
 724                         "Drop packet: not received via bidirectional link\n");
 725                 return;
 726         }
 727
 728         if (is_duplicate) {
 729                 bat_dbg(DBG_BATMAN, bat_priv,
 730                         "Drop packet: duplicate packet received\n");
 731                 return;
 732         }
 733
 734         bat_dbg(DBG_BATMAN, bat_priv,
 735                 "Forwarding packet: rebroadcast originator packet\n");
 736         schedule_forward_packet(orig_node, ethhdr, batman_packet,
 737                                 0, hna_buff_len, if_incoming);
 738 }
 739
 740 int recv_bat_packet(struct sk_buff *skb,
 741                                 struct batman_if *batman_if)
 742 {
 743         struct ethhdr *ethhdr;
 744         unsigned long flags;
 745         struct sk_buff *skb_old;
 746
 747         /* drop packet if it has not necessary minimum size */
 748         if (skb_headlen(skb) < sizeof(struct batman_packet))
 749                 return NET_RX_DROP;
 750
 751         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 752
 753         /* packet with broadcast indication but unicast recipient */
 754         if (!is_bcast(ethhdr->h_dest))
 755                 return NET_RX_DROP;
 756
 757         /* packet with broadcast sender address */
 758         if (is_bcast(ethhdr->h_source))
 759                 return NET_RX_DROP;
 760
 761         /* TODO: we use headlen instead of "length", because
 762          * only this data is paged in. */
 763
 764         /* create a copy of the skb, if needed, to modify it. */
 765         if (!skb_clone_writable(skb, skb_headlen(skb))) {
 766                 skb_old = skb;
 767                 skb = skb_copy(skb, GFP_ATOMIC);
 768                 if (!skb)
 769                         return NET_RX_DROP;
 770                 ethhdr = (struct ethhdr *)skb_mac_header(skb);
 771                 kfree_skb(skb_old);
 772         }
 773
 774         spin_lock_irqsave(&orig_hash_lock, flags);
 775         receive_aggr_bat_packet(ethhdr,
 776                                 skb->data,
 777                                 skb_headlen(skb),
 778                                 batman_if);
 779         spin_unlock_irqrestore(&orig_hash_lock, flags);
 780
 781         kfree_skb(skb);
 782         return NET_RX_SUCCESS;
 783 }
 784
 785 static int recv_my_icmp_packet(struct sk_buff *skb, size_t icmp_len)
 786 {
 787         /* FIXME: each batman_if will be attached to a softif */
 788         struct bat_priv *bat_priv = netdev_priv(soft_device);
 789         struct orig_node *orig_node;
 790         struct icmp_packet_rr *icmp_packet;
 791         struct ethhdr *ethhdr;
 792         struct sk_buff *skb_old;
 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(&orig_hash_lock, flags);
 813         orig_node = ((struct orig_node *)hash_find(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(&orig_hash_lock, flags);
 825
 826                 /* create a copy of the skb, if needed, to modify it. */
 827                 skb_old = NULL;
 828                 if (!skb_clone_writable(skb, icmp_len)) {
 829                         skb_old = skb;
 830                         skb = skb_copy(skb, GFP_ATOMIC);
 831                         if (!skb)
 832                                 return NET_RX_DROP;
 833                         icmp_packet = (struct icmp_packet_rr *)skb->data;
 834                         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 835                         kfree_skb(skb_old);
 836                 }
 837
 838                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 839                 memcpy(icmp_packet->orig,
 840                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 841                 icmp_packet->msg_type = ECHO_REPLY;
 842                 icmp_packet->ttl = TTL;
 843
 844                 send_skb_packet(skb, batman_if, dstaddr);
 845                 ret = NET_RX_SUCCESS;
 846
 847         } else
 848                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 849
 850         return ret;
 851 }
 852
 853 static int recv_icmp_ttl_exceeded(struct sk_buff *skb, size_t icmp_len)
 854 {
 855         /* FIXME: each batman_if will be attached to a softif */
 856         struct bat_priv *bat_priv = netdev_priv(soft_device);
 857         struct orig_node *orig_node;
 858         struct icmp_packet *icmp_packet;
 859         struct ethhdr *ethhdr;
 860         struct sk_buff *skb_old;
 861         struct batman_if *batman_if;
 862         int ret;
 863         unsigned long flags;
 864         uint8_t dstaddr[ETH_ALEN];
 865
 866         icmp_packet = (struct icmp_packet *)skb->data;
 867         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 868
 869         /* send TTL exceeded if packet is an echo request (traceroute) */
 870         if (icmp_packet->msg_type != ECHO_REQUEST) {
 871                 pr_warning("Warning - can't forward icmp packet from %pM to "
 872                            "%pM: ttl exceeded\n", icmp_packet->orig,
 873                            icmp_packet->dst);
 874                 return NET_RX_DROP;
 875         }
 876
 877         if (!bat_priv->primary_if)
 878                 return NET_RX_DROP;
 879
 880         /* get routing information */
 881         spin_lock_irqsave(&orig_hash_lock, flags);
 882         orig_node = ((struct orig_node *)
 883                      hash_find(orig_hash, icmp_packet->orig));
 884         ret = NET_RX_DROP;
 885
 886         if ((orig_node != NULL) &&
 887             (orig_node->router != NULL)) {
 888
 889                 /* don't lock while sending the packets ... we therefore
 890                  * copy the required data before sending */
 891                 batman_if = orig_node->router->if_incoming;
 892                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 893                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 894
 895                 /* create a copy of the skb, if needed, to modify it. */
 896                 if (!skb_clone_writable(skb, icmp_len)) {
 897                         skb_old = skb;
 898                         skb = skb_copy(skb, GFP_ATOMIC);
 899                         if (!skb)
 900                                 return NET_RX_DROP;
 901                         icmp_packet = (struct icmp_packet *) skb->data;
 902                         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 903                         kfree_skb(skb_old);
 904                 }
 905
 906                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 907                 memcpy(icmp_packet->orig,
 908                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 909                 icmp_packet->msg_type = TTL_EXCEEDED;
 910                 icmp_packet->ttl = TTL;
 911
 912                 send_skb_packet(skb, batman_if, dstaddr);
 913                 ret = NET_RX_SUCCESS;
 914
 915         } else
 916                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 917
 918         return ret;
 919 }
 920
 921
 922 int recv_icmp_packet(struct sk_buff *skb)
 923 {
 924         struct icmp_packet_rr *icmp_packet;
 925         struct ethhdr *ethhdr;
 926         struct orig_node *orig_node;
 927         struct sk_buff *skb_old;
 928         struct batman_if *batman_if;
 929         int hdr_size = sizeof(struct icmp_packet);
 930         int ret;
 931         unsigned long flags;
 932         uint8_t dstaddr[ETH_ALEN];
 933
 934         /**
 935          * we truncate all incoming icmp packets if they don't match our size
 936          */
 937         if (skb_headlen(skb) >= sizeof(struct icmp_packet_rr))
 938                 hdr_size = sizeof(struct icmp_packet_rr);
 939
 940         /* drop packet if it has not necessary minimum size */
 941         if (skb_headlen(skb) < hdr_size)
 942                 return NET_RX_DROP;
 943
 944         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 945
 946         /* packet with unicast indication but broadcast recipient */
 947         if (is_bcast(ethhdr->h_dest))
 948                 return NET_RX_DROP;
 949
 950         /* packet with broadcast sender address */
 951         if (is_bcast(ethhdr->h_source))
 952                 return NET_RX_DROP;
 953
 954         /* not for me */
 955         if (!is_my_mac(ethhdr->h_dest))
 956                 return NET_RX_DROP;
 957
 958         icmp_packet = (struct icmp_packet_rr *)skb->data;
 959
 960         /* add record route information if not full */
 961         if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
 962             (icmp_packet->rr_cur < BAT_RR_LEN)) {
 963                 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
 964                         ethhdr->h_dest, ETH_ALEN);
 965                 icmp_packet->rr_cur++;
 966         }
 967
 968         /* packet for me */
 969         if (is_my_mac(icmp_packet->dst))
 970                 return recv_my_icmp_packet(skb, hdr_size);
 971
 972         /* TTL exceeded */
 973         if (icmp_packet->ttl < 2)
 974                 return recv_icmp_ttl_exceeded(skb, hdr_size);
 975
 976         ret = NET_RX_DROP;
 977
 978         /* get routing information */
 979         spin_lock_irqsave(&orig_hash_lock, flags);
 980         orig_node = ((struct orig_node *)
 981                      hash_find(orig_hash, icmp_packet->dst));
 982
 983         if ((orig_node != NULL) &&
 984             (orig_node->router != NULL)) {
 985
 986                 /* don't lock while sending the packets ... we therefore
 987                  * copy the required data before sending */
 988                 batman_if = orig_node->router->if_incoming;
 989                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 990                 spin_unlock_irqrestore(&orig_hash_lock, flags);
 991
 992                 /* create a copy of the skb, if needed, to modify it. */
 993                 if (!skb_clone_writable(skb, hdr_size)) {
 994                         skb_old = skb;
 995                         skb = skb_copy(skb, GFP_ATOMIC);
 996                         if (!skb)
 997                                 return NET_RX_DROP;
 998                         icmp_packet = (struct icmp_packet_rr *)skb->data;
 999                         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1000                         kfree_skb(skb_old);
1001                 }
1002
1003                 /* decrement ttl */
1004                 icmp_packet->ttl--;
1005
1006                 /* route it */
1007                 send_skb_packet(skb, batman_if, dstaddr);
1008                 ret = NET_RX_SUCCESS;
1009
1010         } else
1011                 spin_unlock_irqrestore(&orig_hash_lock, flags);
1012
1013         return ret;
1014 }
1015
1016 /* find a suitable router for this originator, and use
1017  * bonding if possible. */
1018 struct neigh_node *find_router(struct orig_node *orig_node,
1019                 struct batman_if *recv_if)
1020 {
1021         /* FIXME: each orig_node->batman_if will be attached to a softif */
1022         struct bat_priv *bat_priv = netdev_priv(soft_device);
1023         struct orig_node *primary_orig_node;
1024         struct orig_node *router_orig;
1025         struct neigh_node *router, *first_candidate, *best_router;
1026         static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1027         int bonding_enabled;
1028
1029         if (!orig_node)
1030                 return NULL;
1031
1032         if (!orig_node->router)
1033                 return NULL;
1034
1035         /* without bonding, the first node should
1036          * always choose the default router. */
1037
1038         bonding_enabled = atomic_read(&bat_priv->bonding_enabled);
1039         if (!bonding_enabled && (recv_if == NULL))
1040                         return orig_node->router;
1041
1042         router_orig = orig_node->router->orig_node;
1043
1044         /* if we have something in the primary_addr, we can search
1045          * for a potential bonding candidate. */
1046         if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
1047                 return orig_node->router;
1048
1049         /* find the orig_node which has the primary interface. might
1050          * even be the same as our router_orig in many cases */
1051
1052         if (memcmp(router_orig->primary_addr,
1053                                 router_orig->orig, ETH_ALEN) == 0) {
1054                 primary_orig_node = router_orig;
1055         } else {
1056                 primary_orig_node = hash_find(orig_hash,
1057                                                 router_orig->primary_addr);
1058                 if (!primary_orig_node)
1059                         return orig_node->router;
1060         }
1061
1062         /* with less than 2 candidates, we can't do any
1063          * bonding and prefer the original router. */
1064
1065         if (primary_orig_node->bond.candidates < 2)
1066                 return orig_node->router;
1067
1068
1069         /* all nodes between should choose a candidate which
1070          * is is not on the interface where the packet came
1071          * in. */
1072         first_candidate = primary_orig_node->bond.selected;
1073         router = first_candidate;
1074
1075         if (bonding_enabled) {
1076                 /* in the bonding case, send the packets in a round
1077                  * robin fashion over the remaining interfaces. */
1078                 do {
1079                         /* recv_if == NULL on the first node. */
1080                         if (router->if_incoming != recv_if)
1081                                 break;
1082
1083                         router = router->next_bond_candidate;
1084                 } while (router != first_candidate);
1085
1086                 primary_orig_node->bond.selected = router->next_bond_candidate;
1087
1088         } else {
1089                 /* if bonding is disabled, use the best of the
1090                  * remaining candidates which are not using
1091                  * this interface. */
1092                 best_router = first_candidate;
1093
1094                 do {
1095                         /* recv_if == NULL on the first node. */
1096                         if ((router->if_incoming != recv_if) &&
1097                                 (router->tq_avg > best_router->tq_avg))
1098                                         best_router = router;
1099
1100                         router = router->next_bond_candidate;
1101                 } while (router != first_candidate);
1102
1103                 router = best_router;
1104         }
1105
1106         return router;
1107 }
1108
1109 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1110 {
1111         struct ethhdr *ethhdr;
1112
1113         /* drop packet if it has not necessary minimum size */
1114         if (skb_headlen(skb) < hdr_size)
1115                 return -1;
1116
1117         ethhdr = (struct ethhdr *) skb_mac_header(skb);
1118
1119         /* packet with unicast indication but broadcast recipient */
1120         if (is_bcast(ethhdr->h_dest))
1121                 return -1;
1122
1123         /* packet with broadcast sender address */
1124         if (is_bcast(ethhdr->h_source))
1125                 return -1;
1126
1127         /* not for me */
1128         if (!is_my_mac(ethhdr->h_dest))
1129                 return -1;
1130
1131         return 0;
1132 }
1133
1134 static int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
1135                 int hdr_size)
1136 {
1137         struct orig_node *orig_node;
1138         struct neigh_node *router;
1139         struct batman_if *batman_if;
1140         struct sk_buff *skb_old;
1141         uint8_t dstaddr[ETH_ALEN];
1142         unsigned long flags;
1143         struct unicast_packet *unicast_packet =
1144                 (struct unicast_packet *) skb->data;
1145         struct ethhdr *ethhdr = (struct ethhdr *) skb_mac_header(skb);
1146
1147         /* TTL exceeded */
1148         if (unicast_packet->ttl < 2) {
1149                 pr_warning("Warning - can't forward unicast packet from %pM to "
1150                            "%pM: ttl exceeded\n", ethhdr->h_source,
1151                            unicast_packet->dest);
1152                 return NET_RX_DROP;
1153         }
1154
1155         /* get routing information */
1156         spin_lock_irqsave(&orig_hash_lock, flags);
1157         orig_node = ((struct orig_node *)
1158                      hash_find(orig_hash, unicast_packet->dest));
1159
1160         router = find_router(orig_node, recv_if);
1161
1162         if (!router) {
1163                 spin_unlock_irqrestore(&orig_hash_lock, flags);
1164                 return NET_RX_DROP;
1165         }
1166
1167         /* don't lock while sending the packets ... we therefore
1168          * copy the required data before sending */
1169
1170         batman_if = router->if_incoming;
1171         memcpy(dstaddr, router->addr, ETH_ALEN);
1172
1173         spin_unlock_irqrestore(&orig_hash_lock, flags);
1174
1175         /* create a copy of the skb, if needed, to modify it. */
1176         if (!skb_clone_writable(skb, hdr_size)) {
1177                 skb_old = skb;
1178                 skb = skb_copy(skb, GFP_ATOMIC);
1179                 if (!skb)
1180                         return NET_RX_DROP;
1181                 unicast_packet = (struct unicast_packet *) skb->data;
1182                 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1183                 kfree_skb(skb_old);
1184         }
1185
1186         /* decrement ttl */
1187         unicast_packet->ttl--;
1188
1189         /* route it */
1190         send_skb_packet(skb, batman_if, dstaddr);
1191
1192         return NET_RX_SUCCESS;
1193 }
1194
1195 int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1196 {
1197         struct unicast_packet *unicast_packet;
1198         int hdr_size = sizeof(struct unicast_packet);
1199
1200         if (check_unicast_packet(skb, hdr_size) < 0)
1201                 return NET_RX_DROP;
1202
1203         unicast_packet = (struct unicast_packet *) skb->data;
1204
1205         /* packet for me */
1206         if (is_my_mac(unicast_packet->dest)) {
1207                 interface_rx(skb, hdr_size);
1208                 return NET_RX_SUCCESS;
1209         }
1210
1211         return route_unicast_packet(skb, recv_if, hdr_size);
1212 }
1213
1214 int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
1215 {
1216         struct unicast_frag_packet *unicast_packet;
1217         struct orig_node *orig_node;
1218         struct frag_packet_list_entry *tmp_frag_entry;
1219         int hdr_size = sizeof(struct unicast_frag_packet);
1220         unsigned long flags;
1221
1222         if (check_unicast_packet(skb, hdr_size) < 0)
1223                 return NET_RX_DROP;
1224
1225         unicast_packet = (struct unicast_frag_packet *) skb->data;
1226
1227         /* packet for me */
1228         if (is_my_mac(unicast_packet->dest)) {
1229
1230                 spin_lock_irqsave(&orig_hash_lock, flags);
1231                 orig_node = ((struct orig_node *)
1232                         hash_find(orig_hash, unicast_packet->orig));
1233
1234                 if (!orig_node) {
1235                         pr_warning("couldn't find orig node for "
1236                                 "fragmentation\n");
1237                         spin_unlock_irqrestore(&orig_hash_lock, flags);
1238                         return NET_RX_DROP;
1239                 }
1240
1241                 orig_node->last_frag_packet = jiffies;
1242
1243                 if (list_empty(&orig_node->frag_list))
1244                         create_frag_buffer(&orig_node->frag_list);
1245
1246                 tmp_frag_entry =
1247                         search_frag_packet(&orig_node->frag_list,
1248                         unicast_packet);
1249
1250                 if (!tmp_frag_entry) {
1251                         create_frag_entry(&orig_node->frag_list, skb);
1252                         spin_unlock_irqrestore(&orig_hash_lock, flags);
1253                         return NET_RX_SUCCESS;
1254                 }
1255
1256                 skb = merge_frag_packet(&orig_node->frag_list,
1257                         tmp_frag_entry, skb);
1258                 spin_unlock_irqrestore(&orig_hash_lock, flags);
1259                 if (!skb)
1260                         return NET_RX_DROP;
1261
1262                 interface_rx(skb, hdr_size);
1263                 return NET_RX_SUCCESS;
1264         }
1265
1266         return route_unicast_packet(skb, recv_if, hdr_size);
1267 }
1268
1269 int recv_bcast_packet(struct sk_buff *skb)
1270 {
1271         struct orig_node *orig_node;
1272         struct bcast_packet *bcast_packet;
1273         struct ethhdr *ethhdr;
1274         int hdr_size = sizeof(struct bcast_packet);
1275         int32_t seq_diff;
1276         unsigned long flags;
1277
1278         /* drop packet if it has not necessary minimum size */
1279         if (skb_headlen(skb) < hdr_size)
1280                 return NET_RX_DROP;
1281
1282         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1283
1284         /* packet with broadcast indication but unicast recipient */
1285         if (!is_bcast(ethhdr->h_dest))
1286                 return NET_RX_DROP;
1287
1288         /* packet with broadcast sender address */
1289         if (is_bcast(ethhdr->h_source))
1290                 return NET_RX_DROP;
1291
1292         /* ignore broadcasts sent by myself */
1293         if (is_my_mac(ethhdr->h_source))
1294                 return NET_RX_DROP;
1295
1296         bcast_packet = (struct bcast_packet *)skb->data;
1297
1298         /* ignore broadcasts originated by myself */
1299         if (is_my_mac(bcast_packet->orig))
1300                 return NET_RX_DROP;
1301
1302         if (bcast_packet->ttl < 2)
1303                 return NET_RX_DROP;
1304
1305         spin_lock_irqsave(&orig_hash_lock, flags);
1306         orig_node = ((struct orig_node *)
1307                      hash_find(orig_hash, bcast_packet->orig));
1308
1309         if (orig_node == NULL) {
1310                 spin_unlock_irqrestore(&orig_hash_lock, flags);
1311                 return NET_RX_DROP;
1312         }
1313
1314         /* check whether the packet is a duplicate */
1315         if (get_bit_status(orig_node->bcast_bits,
1316                            orig_node->last_bcast_seqno,
1317                            ntohl(bcast_packet->seqno))) {
1318                 spin_unlock_irqrestore(&orig_hash_lock, flags);
1319                 return NET_RX_DROP;
1320         }
1321
1322         seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1323
1324         /* check whether the packet is old and the host just restarted. */
1325         if (window_protected(seq_diff, &orig_node->bcast_seqno_reset)) {
1326                 spin_unlock_irqrestore(&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(orig_node->bcast_bits, seq_diff, 1))
1333                 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1334
1335         spin_unlock_irqrestore(&orig_hash_lock, flags);
1336         /* rebroadcast packet */
1337         add_bcast_packet_to_list(skb);
1338
1339         /* broadcast for me */
1340         interface_rx(skb, hdr_size);
1341
1342         return NET_RX_SUCCESS;
1343 }
1344
1345 int recv_vis_packet(struct sk_buff *skb)
1346 {
1347         struct vis_packet *vis_packet;
1348         struct ethhdr *ethhdr;
1349         struct bat_priv *bat_priv;
1350         int hdr_size = sizeof(struct vis_packet);
1351
1352         if (skb_headlen(skb) < hdr_size)
1353                 return NET_RX_DROP;
1354
1355         vis_packet = (struct vis_packet *) skb->data;
1356         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1357
1358         /* not for me */
1359         if (!is_my_mac(ethhdr->h_dest))
1360                 return NET_RX_DROP;
1361
1362         /* ignore own packets */
1363         if (is_my_mac(vis_packet->vis_orig))
1364                 return NET_RX_DROP;
1365
1366         if (is_my_mac(vis_packet->sender_orig))
1367                 return NET_RX_DROP;
1368
1369         /* FIXME: each batman_if will be attached to a softif */
1370         bat_priv = netdev_priv(soft_device);
1371
1372         switch (vis_packet->vis_type) {
1373         case VIS_TYPE_SERVER_SYNC:
1374                 /* TODO: handle fragmented skbs properly */
1375                 receive_server_sync_packet(bat_priv, vis_packet,
1376                                            skb_headlen(skb));
1377                 break;
1378
1379         case VIS_TYPE_CLIENT_UPDATE:
1380                 /* TODO: handle fragmented skbs properly */
1381                 receive_client_update_packet(bat_priv, vis_packet,
1382                                              skb_headlen(skb));
1383                 break;
1384
1385         default:        /* ignore unknown packet */
1386                 break;
1387         }
1388
1389         /* We take a copy of the data in the packet, so we should
1390            always free the skbuf. */
1391         return NET_RX_DROP;
1392 }