net/batman-adv/routing.c

   1 /*
   2  * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "routing.h"
  24 #include "send.h"
  25 #include "hash.h"
  26 #include "soft-interface.h"
  27 #include "hard-interface.h"
  28 #include "icmp_socket.h"
  29 #include "translation-table.h"
  30 #include "originator.h"
  31 #include "ring_buffer.h"
  32 #include "vis.h"
  33 #include "aggregation.h"
  34 #include "gateway_common.h"
  35 #include "gateway_client.h"
  36 #include "unicast.h"
  37
  38 void slide_own_bcast_window(struct batman_if *batman_if)
  39 {
  40         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
  41         struct hashtable_t *hash = bat_priv->orig_hash;
  42         struct hlist_node *walk;
  43         struct hlist_head *head;
  44         struct element_t *bucket;
  45         struct orig_node *orig_node;
  46         unsigned long *word;
  47         int i;
  48         size_t word_index;
  49
  50         spin_lock_bh(&bat_priv->orig_hash_lock);
  51
  52         for (i = 0; i < hash->size; i++) {
  53                 head = &hash->table[i];
  54
  55                 rcu_read_lock();
  56                 hlist_for_each_entry_rcu(bucket, walk, head, hlist) {
  57                         orig_node = bucket->data;
  58                         word_index = batman_if->if_num * NUM_WORDS;
  59                         word = &(orig_node->bcast_own[word_index]);
  60
  61                         bit_get_packet(bat_priv, word, 1, 0);
  62                         orig_node->bcast_own_sum[batman_if->if_num] =
  63                                 bit_packet_count(word);
  64                 }
  65                 rcu_read_unlock();
  66         }
  67
  68         spin_unlock_bh(&bat_priv->orig_hash_lock);
  69 }
  70
  71 static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node,
  72                        unsigned char *hna_buff, int hna_buff_len)
  73 {
  74         if ((hna_buff_len != orig_node->hna_buff_len) ||
  75             ((hna_buff_len > 0) &&
  76              (orig_node->hna_buff_len > 0) &&
  77              (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
  78
  79                 if (orig_node->hna_buff_len > 0)
  80                         hna_global_del_orig(bat_priv, orig_node,
  81                                             "originator changed hna");
  82
  83                 if ((hna_buff_len > 0) && (hna_buff))
  84                         hna_global_add_orig(bat_priv, orig_node,
  85                                             hna_buff, hna_buff_len);
  86         }
  87 }
  88
  89 static void update_route(struct bat_priv *bat_priv,
  90                          struct orig_node *orig_node,
  91                          struct neigh_node *neigh_node,
  92                          unsigned char *hna_buff, int hna_buff_len)
  93 {
  94         struct neigh_node *neigh_node_tmp;
  95
  96         /* route deleted */
  97         if ((orig_node->router) && (!neigh_node)) {
  98
  99                 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
 100                         orig_node->orig);
 101                 hna_global_del_orig(bat_priv, orig_node,
 102                                     "originator timed out");
 103
 104                 /* route added */
 105         } else if ((!orig_node->router) && (neigh_node)) {
 106
 107                 bat_dbg(DBG_ROUTES, bat_priv,
 108                         "Adding route towards: %pM (via %pM)\n",
 109                         orig_node->orig, neigh_node->addr);
 110                 hna_global_add_orig(bat_priv, orig_node,
 111                                     hna_buff, hna_buff_len);
 112
 113                 /* route changed */
 114         } else {
 115                 bat_dbg(DBG_ROUTES, bat_priv,
 116                         "Changing route towards: %pM "
 117                         "(now via %pM - was via %pM)\n",
 118                         orig_node->orig, neigh_node->addr,
 119                         orig_node->router->addr);
 120         }
 121
 122         if (neigh_node)
 123                 kref_get(&neigh_node->refcount);
 124         neigh_node_tmp = orig_node->router;
 125         orig_node->router = neigh_node;
 126         if (neigh_node_tmp)
 127                 kref_put(&neigh_node_tmp->refcount, neigh_node_free_ref);
 128 }
 129
 130
 131 void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
 132                    struct neigh_node *neigh_node, unsigned char *hna_buff,
 133                    int hna_buff_len)
 134 {
 135
 136         if (!orig_node)
 137                 return;
 138
 139         if (orig_node->router != neigh_node)
 140                 update_route(bat_priv, orig_node, neigh_node,
 141                              hna_buff, hna_buff_len);
 142         /* may be just HNA changed */
 143         else
 144                 update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
 145 }
 146
 147 static int is_bidirectional_neigh(struct orig_node *orig_node,
 148                                 struct orig_node *orig_neigh_node,
 149                                 struct batman_packet *batman_packet,
 150                                 struct batman_if *if_incoming)
 151 {
 152         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 153         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 154         struct hlist_node *node;
 155         unsigned char total_count;
 156         int ret = 0;
 157
 158         if (orig_node == orig_neigh_node) {
 159                 rcu_read_lock();
 160                 hlist_for_each_entry_rcu(tmp_neigh_node, node,
 161                                          &orig_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_node,
 171                                                      orig_neigh_node,
 172                                                      orig_neigh_node->orig,
 173                                                      if_incoming);
 174                 /* create_neighbor failed, return 0 */
 175                 if (!neigh_node)
 176                         goto unlock;
 177
 178                 kref_get(&neigh_node->refcount);
 179                 rcu_read_unlock();
 180
 181                 neigh_node->last_valid = jiffies;
 182         } else {
 183                 /* find packet count of corresponding one hop neighbor */
 184                 rcu_read_lock();
 185                 hlist_for_each_entry_rcu(tmp_neigh_node, node,
 186                                          &orig_neigh_node->neigh_list, list) {
 187
 188                         if (compare_orig(tmp_neigh_node->addr,
 189                                          orig_neigh_node->orig) &&
 190                             (tmp_neigh_node->if_incoming == if_incoming))
 191                                 neigh_node = tmp_neigh_node;
 192                 }
 193
 194                 if (!neigh_node)
 195                         neigh_node = create_neighbor(orig_neigh_node,
 196                                                      orig_neigh_node,
 197                                                      orig_neigh_node->orig,
 198                                                      if_incoming);
 199                 /* create_neighbor failed, return 0 */
 200                 if (!neigh_node)
 201                         goto unlock;
 202
 203                 kref_get(&neigh_node->refcount);
 204                 rcu_read_unlock();
 205         }
 206
 207         orig_node->last_valid = jiffies;
 208
 209         /* pay attention to not get a value bigger than 100 % */
 210         total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
 211                        neigh_node->real_packet_count ?
 212                        neigh_node->real_packet_count :
 213                        orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
 214
 215         /* if we have too few packets (too less data) we set tq_own to zero */
 216         /* if we receive too few packets it is not considered bidirectional */
 217         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 218             (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 219                 orig_neigh_node->tq_own = 0;
 220         else
 221                 /* neigh_node->real_packet_count is never zero as we
 222                  * only purge old information when getting new
 223                  * information */
 224                 orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
 225                         neigh_node->real_packet_count;
 226
 227         /*
 228          * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 229          * affect the nearly-symmetric links only a little, but
 230          * punishes asymmetric links more.  This will give a value
 231          * between 0 and TQ_MAX_VALUE
 232          */
 233         orig_neigh_node->tq_asym_penalty =
 234                 TQ_MAX_VALUE -
 235                 (TQ_MAX_VALUE *
 236                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 237                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 238                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
 239                 (TQ_LOCAL_WINDOW_SIZE *
 240                  TQ_LOCAL_WINDOW_SIZE *
 241                  TQ_LOCAL_WINDOW_SIZE);
 242
 243         batman_packet->tq = ((batman_packet->tq *
 244                               orig_neigh_node->tq_own *
 245                               orig_neigh_node->tq_asym_penalty) /
 246                              (TQ_MAX_VALUE * TQ_MAX_VALUE));
 247
 248         bat_dbg(DBG_BATMAN, bat_priv,
 249                 "bidirectional: "
 250                 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
 251                 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
 252                 "total tq: %3i\n",
 253                 orig_node->orig, orig_neigh_node->orig, total_count,
 254                 neigh_node->real_packet_count, orig_neigh_node->tq_own,
 255                 orig_neigh_node->tq_asym_penalty, batman_packet->tq);
 256
 257         /* if link has the minimum required transmission quality
 258          * consider it bidirectional */
 259         if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 260                 ret = 1;
 261
 262         goto out;
 263
 264 unlock:
 265         rcu_read_unlock();
 266 out:
 267         if (neigh_node)
 268                 kref_put(&neigh_node->refcount, neigh_node_free_ref);
 269         return ret;
 270 }
 271
 272 static void update_orig(struct bat_priv *bat_priv,
 273                         struct orig_node *orig_node,
 274                         struct ethhdr *ethhdr,
 275                         struct batman_packet *batman_packet,
 276                         struct batman_if *if_incoming,
 277                         unsigned char *hna_buff, int hna_buff_len,
 278                         char is_duplicate)
 279 {
 280         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 281         struct hlist_node *node;
 282         int tmp_hna_buff_len;
 283
 284         bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
 285                 "Searching and updating originator entry of received packet\n");
 286
 287         rcu_read_lock();
 288         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 289                                  &orig_node->neigh_list, list) {
 290                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 291                     (tmp_neigh_node->if_incoming == if_incoming)) {
 292                         neigh_node = tmp_neigh_node;
 293                         continue;
 294                 }
 295
 296                 if (is_duplicate)
 297                         continue;
 298
 299                 ring_buffer_set(tmp_neigh_node->tq_recv,
 300                                 &tmp_neigh_node->tq_index, 0);
 301                 tmp_neigh_node->tq_avg =
 302                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 303         }
 304
 305         if (!neigh_node) {
 306                 struct orig_node *orig_tmp;
 307
 308                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
 309                 if (!orig_tmp)
 310                         goto unlock;
 311
 312                 neigh_node = create_neighbor(orig_node, orig_tmp,
 313                                              ethhdr->h_source, if_incoming);
 314                 if (!neigh_node)
 315                         goto unlock;
 316         } else
 317                 bat_dbg(DBG_BATMAN, bat_priv,
 318                         "Updating existing last-hop neighbor of originator\n");
 319
 320         kref_get(&neigh_node->refcount);
 321         rcu_read_unlock();
 322
 323         orig_node->flags = batman_packet->flags;
 324         neigh_node->last_valid = jiffies;
 325
 326         ring_buffer_set(neigh_node->tq_recv,
 327                         &neigh_node->tq_index,
 328                         batman_packet->tq);
 329         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 330
 331         if (!is_duplicate) {
 332                 orig_node->last_ttl = batman_packet->ttl;
 333                 neigh_node->last_ttl = batman_packet->ttl;
 334         }
 335
 336         tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
 337                             batman_packet->num_hna * ETH_ALEN : hna_buff_len);
 338
 339         /* if this neighbor already is our next hop there is nothing
 340          * to change */
 341         if (orig_node->router == neigh_node)
 342                 goto update_hna;
 343
 344         /* if this neighbor does not offer a better TQ we won't consider it */
 345         if ((orig_node->router) &&
 346             (orig_node->router->tq_avg > neigh_node->tq_avg))
 347                 goto update_hna;
 348
 349         /* if the TQ is the same and the link not more symetric we
 350          * won't consider it either */
 351         if ((orig_node->router) &&
 352              ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
 353              (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
 354               >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
 355                 goto update_hna;
 356
 357         update_routes(bat_priv, orig_node, neigh_node,
 358                       hna_buff, tmp_hna_buff_len);
 359         goto update_gw;
 360
 361 update_hna:
 362         update_routes(bat_priv, orig_node, orig_node->router,
 363                       hna_buff, tmp_hna_buff_len);
 364
 365 update_gw:
 366         if (orig_node->gw_flags != batman_packet->gw_flags)
 367                 gw_node_update(bat_priv, orig_node, batman_packet->gw_flags);
 368
 369         orig_node->gw_flags = batman_packet->gw_flags;
 370
 371         /* restart gateway selection if fast or late switching was enabled */
 372         if ((orig_node->gw_flags) &&
 373             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
 374             (atomic_read(&bat_priv->gw_sel_class) > 2))
 375                 gw_check_election(bat_priv, orig_node);
 376
 377         goto out;
 378
 379 unlock:
 380         rcu_read_unlock();
 381 out:
 382         if (neigh_node)
 383                 kref_put(&neigh_node->refcount, neigh_node_free_ref);
 384 }
 385
 386 /* checks whether the host restarted and is in the protection time.
 387  * returns:
 388  *  0 if the packet is to be accepted
 389  *  1 if the packet is to be ignored.
 390  */
 391 static int window_protected(struct bat_priv *bat_priv,
 392                             int32_t seq_num_diff,
 393                             unsigned long *last_reset)
 394 {
 395         if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
 396                 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
 397                 if (time_after(jiffies, *last_reset +
 398                         msecs_to_jiffies(RESET_PROTECTION_MS))) {
 399
 400                         *last_reset = jiffies;
 401                         bat_dbg(DBG_BATMAN, bat_priv,
 402                                 "old packet received, start protection\n");
 403
 404                         return 0;
 405                 } else
 406                         return 1;
 407         }
 408         return 0;
 409 }
 410
 411 /* processes a batman packet for all interfaces, adjusts the sequence number and
 412  * finds out whether it is a duplicate.
 413  * returns:
 414  *   1 the packet is a duplicate
 415  *   0 the packet has not yet been received
 416  *  -1 the packet is old and has been received while the seqno window
 417  *     was protected. Caller should drop it.
 418  */
 419 static char count_real_packets(struct ethhdr *ethhdr,
 420                                struct batman_packet *batman_packet,
 421                                struct batman_if *if_incoming)
 422 {
 423         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 424         struct orig_node *orig_node;
 425         struct neigh_node *tmp_neigh_node;
 426         struct hlist_node *node;
 427         char is_duplicate = 0;
 428         int32_t seq_diff;
 429         int need_update = 0;
 430         int set_mark;
 431
 432         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 433         if (!orig_node)
 434                 return 0;
 435
 436         seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
 437
 438         /* signalize caller that the packet is to be dropped. */
 439         if (window_protected(bat_priv, seq_diff,
 440                              &orig_node->batman_seqno_reset))
 441                 return -1;
 442
 443         rcu_read_lock();
 444         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 445                                  &orig_node->neigh_list, list) {
 446
 447                 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
 448                                                orig_node->last_real_seqno,
 449                                                batman_packet->seqno);
 450
 451                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 452                     (tmp_neigh_node->if_incoming == if_incoming))
 453                         set_mark = 1;
 454                 else
 455                         set_mark = 0;
 456
 457                 /* if the window moved, set the update flag. */
 458                 need_update |= bit_get_packet(bat_priv,
 459                                               tmp_neigh_node->real_bits,
 460                                               seq_diff, set_mark);
 461
 462                 tmp_neigh_node->real_packet_count =
 463                         bit_packet_count(tmp_neigh_node->real_bits);
 464         }
 465         rcu_read_unlock();
 466
 467         if (need_update) {
 468                 bat_dbg(DBG_BATMAN, bat_priv,
 469                         "updating last_seqno: old %d, new %d\n",
 470                         orig_node->last_real_seqno, batman_packet->seqno);
 471                 orig_node->last_real_seqno = batman_packet->seqno;
 472         }
 473
 474         return is_duplicate;
 475 }
 476
 477 /* copy primary address for bonding */
 478 static void mark_bonding_address(struct orig_node *orig_node,
 479                                  struct orig_node *orig_neigh_node,
 480                                  struct batman_packet *batman_packet)
 481
 482 {
 483         if (batman_packet->flags & PRIMARIES_FIRST_HOP)
 484                 memcpy(orig_neigh_node->primary_addr,
 485                        orig_node->orig, ETH_ALEN);
 486
 487         return;
 488 }
 489
 490 /* mark possible bond.candidates in the neighbor list */
 491 void update_bonding_candidates(struct orig_node *orig_node)
 492 {
 493         int candidates;
 494         int interference_candidate;
 495         int best_tq;
 496         struct hlist_node *node, *node2;
 497         struct neigh_node *tmp_neigh_node, *tmp_neigh_node2;
 498         struct neigh_node *first_candidate, *last_candidate;
 499
 500         /* update the candidates for this originator */
 501         if (!orig_node->router) {
 502                 orig_node->bond.candidates = 0;
 503                 return;
 504         }
 505
 506         best_tq = orig_node->router->tq_avg;
 507
 508         /* update bond.candidates */
 509
 510         candidates = 0;
 511
 512         /* mark other nodes which also received "PRIMARIES FIRST HOP" packets
 513          * as "bonding partner" */
 514
 515         /* first, zero the list */
 516         rcu_read_lock();
 517         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 518                                  &orig_node->neigh_list, list) {
 519                 tmp_neigh_node->next_bond_candidate = NULL;
 520         }
 521         rcu_read_unlock();
 522
 523         first_candidate = NULL;
 524         last_candidate = NULL;
 525
 526         rcu_read_lock();
 527         hlist_for_each_entry_rcu(tmp_neigh_node, node,
 528                                  &orig_node->neigh_list, list) {
 529
 530                 /* only consider if it has the same primary address ...  */
 531                 if (memcmp(orig_node->orig,
 532                                 tmp_neigh_node->orig_node->primary_addr,
 533                                 ETH_ALEN) != 0)
 534                         continue;
 535
 536                 /* ... and is good enough to be considered */
 537                 if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
 538                         continue;
 539
 540                 /* check if we have another candidate with the same
 541                  * mac address or interface. If we do, we won't
 542                  * select this candidate because of possible interference. */
 543
 544                 interference_candidate = 0;
 545                 hlist_for_each_entry_rcu(tmp_neigh_node2, node2,
 546                                          &orig_node->neigh_list, list) {
 547
 548                         if (tmp_neigh_node2 == tmp_neigh_node)
 549                                 continue;
 550
 551                         /* we only care if the other candidate is even
 552                          * considered as candidate. */
 553                         if (!tmp_neigh_node2->next_bond_candidate)
 554                                 continue;
 555
 556
 557                         if ((tmp_neigh_node->if_incoming ==
 558                                 tmp_neigh_node2->if_incoming)
 559                                 || (memcmp(tmp_neigh_node->addr,
 560                                 tmp_neigh_node2->addr, ETH_ALEN) == 0)) {
 561
 562                                 interference_candidate = 1;
 563                                 break;
 564                         }
 565                 }
 566                 /* don't care further if it is an interference candidate */
 567                 if (interference_candidate)
 568                         continue;
 569
 570                 if (!first_candidate) {
 571                         first_candidate = tmp_neigh_node;
 572                         tmp_neigh_node->next_bond_candidate = first_candidate;
 573                 } else
 574                         tmp_neigh_node->next_bond_candidate = last_candidate;
 575
 576                 last_candidate = tmp_neigh_node;
 577
 578                 candidates++;
 579         }
 580         rcu_read_unlock();
 581
 582         if (candidates > 0) {
 583                 first_candidate->next_bond_candidate = last_candidate;
 584                 orig_node->bond.selected = first_candidate;
 585         }
 586
 587         orig_node->bond.candidates = candidates;
 588 }
 589
 590 void receive_bat_packet(struct ethhdr *ethhdr,
 591                                 struct batman_packet *batman_packet,
 592                                 unsigned char *hna_buff, int hna_buff_len,
 593                                 struct batman_if *if_incoming)
 594 {
 595         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 596         struct batman_if *batman_if;
 597         struct orig_node *orig_neigh_node, *orig_node;
 598         char has_directlink_flag;
 599         char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 600         char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 601         char is_duplicate;
 602         uint32_t if_incoming_seqno;
 603
 604         /* Silently drop when the batman packet is actually not a
 605          * correct packet.
 606          *
 607          * This might happen if a packet is padded (e.g. Ethernet has a
 608          * minimum frame length of 64 byte) and the aggregation interprets
 609          * it as an additional length.
 610          *
 611          * TODO: A more sane solution would be to have a bit in the
 612          * batman_packet to detect whether the packet is the last
 613          * packet in an aggregation.  Here we expect that the padding
 614          * is always zero (or not 0x01)
 615          */
 616         if (batman_packet->packet_type != BAT_PACKET)
 617                 return;
 618
 619         /* could be changed by schedule_own_packet() */
 620         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 621
 622         has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
 623
 624         is_single_hop_neigh = (compare_orig(ethhdr->h_source,
 625                                             batman_packet->orig) ? 1 : 0);
 626
 627         bat_dbg(DBG_BATMAN, bat_priv,
 628                 "Received BATMAN packet via NB: %pM, IF: %s [%pM] "
 629                 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
 630                 "TTL %d, V %d, IDF %d)\n",
 631                 ethhdr->h_source, if_incoming->net_dev->name,
 632                 if_incoming->net_dev->dev_addr, batman_packet->orig,
 633                 batman_packet->prev_sender, batman_packet->seqno,
 634                 batman_packet->tq, batman_packet->ttl, batman_packet->version,
 635                 has_directlink_flag);
 636
 637         rcu_read_lock();
 638         list_for_each_entry_rcu(batman_if, &if_list, list) {
 639                 if (batman_if->if_status != IF_ACTIVE)
 640                         continue;
 641
 642                 if (batman_if->soft_iface != if_incoming->soft_iface)
 643                         continue;
 644
 645                 if (compare_orig(ethhdr->h_source,
 646                                  batman_if->net_dev->dev_addr))
 647                         is_my_addr = 1;
 648
 649                 if (compare_orig(batman_packet->orig,
 650                                  batman_if->net_dev->dev_addr))
 651                         is_my_orig = 1;
 652
 653                 if (compare_orig(batman_packet->prev_sender,
 654                                  batman_if->net_dev->dev_addr))
 655                         is_my_oldorig = 1;
 656
 657                 if (compare_orig(ethhdr->h_source, broadcast_addr))
 658                         is_broadcast = 1;
 659         }
 660         rcu_read_unlock();
 661
 662         if (batman_packet->version != COMPAT_VERSION) {
 663                 bat_dbg(DBG_BATMAN, bat_priv,
 664                         "Drop packet: incompatible batman version (%i)\n",
 665                         batman_packet->version);
 666                 return;
 667         }
 668
 669         if (is_my_addr) {
 670                 bat_dbg(DBG_BATMAN, bat_priv,
 671                         "Drop packet: received my own broadcast (sender: %pM"
 672                         ")\n",
 673                         ethhdr->h_source);
 674                 return;
 675         }
 676
 677         if (is_broadcast) {
 678                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 679                 "ignoring all packets with broadcast source addr (sender: %pM"
 680                 ")\n", ethhdr->h_source);
 681                 return;
 682         }
 683
 684         if (is_my_orig) {
 685                 unsigned long *word;
 686                 int offset;
 687
 688                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
 689
 690                 if (!orig_neigh_node)
 691                         return;
 692
 693                 /* neighbor has to indicate direct link and it has to
 694                  * come via the corresponding interface */
 695                 /* if received seqno equals last send seqno save new
 696                  * seqno for bidirectional check */
 697                 if (has_directlink_flag &&
 698                     compare_orig(if_incoming->net_dev->dev_addr,
 699                                  batman_packet->orig) &&
 700                     (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
 701                         offset = if_incoming->if_num * NUM_WORDS;
 702                         word = &(orig_neigh_node->bcast_own[offset]);
 703                         bit_mark(word, 0);
 704                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
 705                                 bit_packet_count(word);
 706                 }
 707
 708                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
 709                         "originator packet from myself (via neighbor)\n");
 710                 return;
 711         }
 712
 713         if (is_my_oldorig) {
 714                 bat_dbg(DBG_BATMAN, bat_priv,
 715                         "Drop packet: ignoring all rebroadcast echos (sender: "
 716                         "%pM)\n", ethhdr->h_source);
 717                 return;
 718         }
 719
 720         orig_node = get_orig_node(bat_priv, batman_packet->orig);
 721         if (!orig_node)
 722                 return;
 723
 724         is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
 725
 726         if (is_duplicate == -1) {
 727                 bat_dbg(DBG_BATMAN, bat_priv,
 728                         "Drop packet: packet within seqno protection time "
 729                         "(sender: %pM)\n", ethhdr->h_source);
 730                 return;
 731         }
 732
 733         if (batman_packet->tq == 0) {
 734                 bat_dbg(DBG_BATMAN, bat_priv,
 735                         "Drop packet: originator packet with tq equal 0\n");
 736                 return;
 737         }
 738
 739         /* avoid temporary routing loops */
 740         if ((orig_node->router) &&
 741             (orig_node->router->orig_node->router) &&
 742             (compare_orig(orig_node->router->addr,
 743                           batman_packet->prev_sender)) &&
 744             !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
 745             (compare_orig(orig_node->router->addr,
 746                           orig_node->router->orig_node->router->addr))) {
 747                 bat_dbg(DBG_BATMAN, bat_priv,
 748                         "Drop packet: ignoring all rebroadcast packets that "
 749                         "may make me loop (sender: %pM)\n", ethhdr->h_source);
 750                 return;
 751         }
 752
 753         /* if sender is a direct neighbor the sender mac equals
 754          * originator mac */
 755         orig_neigh_node = (is_single_hop_neigh ?
 756                            orig_node :
 757                            get_orig_node(bat_priv, ethhdr->h_source));
 758         if (!orig_neigh_node)
 759                 return;
 760
 761         /* drop packet if sender is not a direct neighbor and if we
 762          * don't route towards it */
 763         if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
 764                 bat_dbg(DBG_BATMAN, bat_priv,
 765                         "Drop packet: OGM via unknown neighbor!\n");
 766                 return;
 767         }
 768
 769         is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
 770                                                 batman_packet, if_incoming);
 771
 772         /* update ranking if it is not a duplicate or has the same
 773          * seqno and similar ttl as the non-duplicate */
 774         if (is_bidirectional &&
 775             (!is_duplicate ||
 776              ((orig_node->last_real_seqno == batman_packet->seqno) &&
 777               (orig_node->last_ttl - 3 <= batman_packet->ttl))))
 778                 update_orig(bat_priv, orig_node, ethhdr, batman_packet,
 779                             if_incoming, hna_buff, hna_buff_len, is_duplicate);
 780
 781         mark_bonding_address(orig_node, orig_neigh_node, batman_packet);
 782         update_bonding_candidates(orig_node);
 783
 784         /* is single hop (direct) neighbor */
 785         if (is_single_hop_neigh) {
 786
 787                 /* mark direct link on incoming interface */
 788                 schedule_forward_packet(orig_node, ethhdr, batman_packet,
 789                                         1, hna_buff_len, if_incoming);
 790
 791                 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
 792                         "rebroadcast neighbor packet with direct link flag\n");
 793                 return;
 794         }
 795
 796         /* multihop originator */
 797         if (!is_bidirectional) {
 798                 bat_dbg(DBG_BATMAN, bat_priv,
 799                         "Drop packet: not received via bidirectional link\n");
 800                 return;
 801         }
 802
 803         if (is_duplicate) {
 804                 bat_dbg(DBG_BATMAN, bat_priv,
 805                         "Drop packet: duplicate packet received\n");
 806                 return;
 807         }
 808
 809         bat_dbg(DBG_BATMAN, bat_priv,
 810                 "Forwarding packet: rebroadcast originator packet\n");
 811         schedule_forward_packet(orig_node, ethhdr, batman_packet,
 812                                 0, hna_buff_len, if_incoming);
 813 }
 814
 815 int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
 816 {
 817         struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
 818         struct ethhdr *ethhdr;
 819
 820         /* drop packet if it has not necessary minimum size */
 821         if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
 822                 return NET_RX_DROP;
 823
 824         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 825
 826         /* packet with broadcast indication but unicast recipient */
 827         if (!is_broadcast_ether_addr(ethhdr->h_dest))
 828                 return NET_RX_DROP;
 829
 830         /* packet with broadcast sender address */
 831         if (is_broadcast_ether_addr(ethhdr->h_source))
 832                 return NET_RX_DROP;
 833
 834         /* create a copy of the skb, if needed, to modify it. */
 835         if (skb_cow(skb, 0) < 0)
 836                 return NET_RX_DROP;
 837
 838         /* keep skb linear */
 839         if (skb_linearize(skb) < 0)
 840                 return NET_RX_DROP;
 841
 842         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 843
 844         spin_lock_bh(&bat_priv->orig_hash_lock);
 845         receive_aggr_bat_packet(ethhdr,
 846                                 skb->data,
 847                                 skb_headlen(skb),
 848                                 batman_if);
 849         spin_unlock_bh(&bat_priv->orig_hash_lock);
 850
 851         kfree_skb(skb);
 852         return NET_RX_SUCCESS;
 853 }
 854
 855 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
 856                                struct sk_buff *skb, size_t icmp_len)
 857 {
 858         struct orig_node *orig_node;
 859         struct icmp_packet_rr *icmp_packet;
 860         struct batman_if *batman_if;
 861         int ret;
 862         uint8_t dstaddr[ETH_ALEN];
 863
 864         icmp_packet = (struct icmp_packet_rr *)skb->data;
 865
 866         /* add data to device queue */
 867         if (icmp_packet->msg_type != ECHO_REQUEST) {
 868                 bat_socket_receive_packet(icmp_packet, icmp_len);
 869                 return NET_RX_DROP;
 870         }
 871
 872         if (!bat_priv->primary_if)
 873                 return NET_RX_DROP;
 874
 875         /* answer echo request (ping) */
 876         /* get routing information */
 877         spin_lock_bh(&bat_priv->orig_hash_lock);
 878         rcu_read_lock();
 879         orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
 880                                                    compare_orig, choose_orig,
 881                                                    icmp_packet->orig));
 882         rcu_read_unlock();
 883         ret = NET_RX_DROP;
 884
 885         if ((orig_node) && (orig_node->router)) {
 886
 887                 /* don't lock while sending the packets ... we therefore
 888                  * copy the required data before sending */
 889                 batman_if = orig_node->router->if_incoming;
 890                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 891                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 892
 893                 /* create a copy of the skb, if needed, to modify it. */
 894                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 895                         return NET_RX_DROP;
 896
 897                 icmp_packet = (struct icmp_packet_rr *)skb->data;
 898
 899                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 900                 memcpy(icmp_packet->orig,
 901                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 902                 icmp_packet->msg_type = ECHO_REPLY;
 903                 icmp_packet->ttl = TTL;
 904
 905                 send_skb_packet(skb, batman_if, dstaddr);
 906                 ret = NET_RX_SUCCESS;
 907
 908         } else
 909                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 910
 911         return ret;
 912 }
 913
 914 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
 915                                   struct sk_buff *skb)
 916 {
 917         struct orig_node *orig_node;
 918         struct icmp_packet *icmp_packet;
 919         struct batman_if *batman_if;
 920         int ret;
 921         uint8_t dstaddr[ETH_ALEN];
 922
 923         icmp_packet = (struct icmp_packet *)skb->data;
 924
 925         /* send TTL exceeded if packet is an echo request (traceroute) */
 926         if (icmp_packet->msg_type != ECHO_REQUEST) {
 927                 pr_debug("Warning - can't forward icmp packet from %pM to "
 928                          "%pM: ttl exceeded\n", icmp_packet->orig,
 929                          icmp_packet->dst);
 930                 return NET_RX_DROP;
 931         }
 932
 933         if (!bat_priv->primary_if)
 934                 return NET_RX_DROP;
 935
 936         /* get routing information */
 937         spin_lock_bh(&bat_priv->orig_hash_lock);
 938         rcu_read_lock();
 939         orig_node = ((struct orig_node *)
 940                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
 941                                icmp_packet->orig));
 942         rcu_read_unlock();
 943         ret = NET_RX_DROP;
 944
 945         if ((orig_node) && (orig_node->router)) {
 946
 947                 /* don't lock while sending the packets ... we therefore
 948                  * copy the required data before sending */
 949                 batman_if = orig_node->router->if_incoming;
 950                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
 951                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 952
 953                 /* create a copy of the skb, if needed, to modify it. */
 954                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
 955                         return NET_RX_DROP;
 956
 957                 icmp_packet = (struct icmp_packet *) skb->data;
 958
 959                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 960                 memcpy(icmp_packet->orig,
 961                        bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 962                 icmp_packet->msg_type = TTL_EXCEEDED;
 963                 icmp_packet->ttl = TTL;
 964
 965                 send_skb_packet(skb, batman_if, dstaddr);
 966                 ret = NET_RX_SUCCESS;
 967
 968         } else
 969                 spin_unlock_bh(&bat_priv->orig_hash_lock);
 970
 971         return ret;
 972 }
 973
 974
 975 int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
 976 {
 977         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
 978         struct icmp_packet_rr *icmp_packet;
 979         struct ethhdr *ethhdr;
 980         struct orig_node *orig_node;
 981         struct batman_if *batman_if;
 982         int hdr_size = sizeof(struct icmp_packet);
 983         int ret;
 984         uint8_t dstaddr[ETH_ALEN];
 985
 986         /**
 987          * we truncate all incoming icmp packets if they don't match our size
 988          */
 989         if (skb->len >= sizeof(struct icmp_packet_rr))
 990                 hdr_size = sizeof(struct icmp_packet_rr);
 991
 992         /* drop packet if it has not necessary minimum size */
 993         if (unlikely(!pskb_may_pull(skb, hdr_size)))
 994                 return NET_RX_DROP;
 995
 996         ethhdr = (struct ethhdr *)skb_mac_header(skb);
 997
 998         /* packet with unicast indication but broadcast recipient */
 999         if (is_broadcast_ether_addr(ethhdr->h_dest))
1000                 return NET_RX_DROP;
1001
1002         /* packet with broadcast sender address */
1003         if (is_broadcast_ether_addr(ethhdr->h_source))
1004                 return NET_RX_DROP;
1005
1006         /* not for me */
1007         if (!is_my_mac(ethhdr->h_dest))
1008                 return NET_RX_DROP;
1009
1010         icmp_packet = (struct icmp_packet_rr *)skb->data;
1011
1012         /* add record route information if not full */
1013         if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
1014             (icmp_packet->rr_cur < BAT_RR_LEN)) {
1015                 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
1016                         ethhdr->h_dest, ETH_ALEN);
1017                 icmp_packet->rr_cur++;
1018         }
1019
1020         /* packet for me */
1021         if (is_my_mac(icmp_packet->dst))
1022                 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
1023
1024         /* TTL exceeded */
1025         if (icmp_packet->ttl < 2)
1026                 return recv_icmp_ttl_exceeded(bat_priv, skb);
1027
1028         ret = NET_RX_DROP;
1029
1030         /* get routing information */
1031         spin_lock_bh(&bat_priv->orig_hash_lock);
1032         rcu_read_lock();
1033         orig_node = ((struct orig_node *)
1034                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
1035                                icmp_packet->dst));
1036         rcu_read_unlock();
1037
1038         if ((orig_node) && (orig_node->router)) {
1039
1040                 /* don't lock while sending the packets ... we therefore
1041                  * copy the required data before sending */
1042                 batman_if = orig_node->router->if_incoming;
1043                 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
1044                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1045
1046                 /* create a copy of the skb, if needed, to modify it. */
1047                 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1048                         return NET_RX_DROP;
1049
1050                 icmp_packet = (struct icmp_packet_rr *)skb->data;
1051
1052                 /* decrement ttl */
1053                 icmp_packet->ttl--;
1054
1055                 /* route it */
1056                 send_skb_packet(skb, batman_if, dstaddr);
1057                 ret = NET_RX_SUCCESS;
1058
1059         } else
1060                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1061
1062         return ret;
1063 }
1064
1065 /* find a suitable router for this originator, and use
1066  * bonding if possible. */
1067 struct neigh_node *find_router(struct bat_priv *bat_priv,
1068                                struct orig_node *orig_node,
1069                                struct batman_if *recv_if)
1070 {
1071         struct orig_node *primary_orig_node;
1072         struct orig_node *router_orig;
1073         struct neigh_node *router, *first_candidate, *best_router;
1074         static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1075         int bonding_enabled;
1076
1077         if (!orig_node)
1078                 return NULL;
1079
1080         if (!orig_node->router)
1081                 return NULL;
1082
1083         /* without bonding, the first node should
1084          * always choose the default router. */
1085
1086         bonding_enabled = atomic_read(&bat_priv->bonding);
1087
1088         if ((!recv_if) && (!bonding_enabled))
1089                 return orig_node->router;
1090
1091         router_orig = orig_node->router->orig_node;
1092
1093         /* if we have something in the primary_addr, we can search
1094          * for a potential bonding candidate. */
1095         if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
1096                 return orig_node->router;
1097
1098         /* find the orig_node which has the primary interface. might
1099          * even be the same as our router_orig in many cases */
1100
1101         if (memcmp(router_orig->primary_addr,
1102                                 router_orig->orig, ETH_ALEN) == 0) {
1103                 primary_orig_node = router_orig;
1104         } else {
1105                 rcu_read_lock();
1106                 primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig,
1107                                                choose_orig,
1108                                                router_orig->primary_addr);
1109                 rcu_read_unlock();
1110
1111                 if (!primary_orig_node)
1112                         return orig_node->router;
1113         }
1114
1115         /* with less than 2 candidates, we can't do any
1116          * bonding and prefer the original router. */
1117
1118         if (primary_orig_node->bond.candidates < 2)
1119                 return orig_node->router;
1120
1121
1122         /* all nodes between should choose a candidate which
1123          * is is not on the interface where the packet came
1124          * in. */
1125         first_candidate = primary_orig_node->bond.selected;
1126         router = first_candidate;
1127
1128         if (bonding_enabled) {
1129                 /* in the bonding case, send the packets in a round
1130                  * robin fashion over the remaining interfaces. */
1131                 do {
1132                         /* recv_if == NULL on the first node. */
1133                         if (router->if_incoming != recv_if)
1134                                 break;
1135
1136                         router = router->next_bond_candidate;
1137                 } while (router != first_candidate);
1138
1139                 primary_orig_node->bond.selected = router->next_bond_candidate;
1140
1141         } else {
1142                 /* if bonding is disabled, use the best of the
1143                  * remaining candidates which are not using
1144                  * this interface. */
1145                 best_router = first_candidate;
1146
1147                 do {
1148                         /* recv_if == NULL on the first node. */
1149                         if ((router->if_incoming != recv_if) &&
1150                                 (router->tq_avg > best_router->tq_avg))
1151                                         best_router = router;
1152
1153                         router = router->next_bond_candidate;
1154                 } while (router != first_candidate);
1155
1156                 router = best_router;
1157         }
1158
1159         return router;
1160 }
1161
1162 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1163 {
1164         struct ethhdr *ethhdr;
1165
1166         /* drop packet if it has not necessary minimum size */
1167         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1168                 return -1;
1169
1170         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1171
1172         /* packet with unicast indication but broadcast recipient */
1173         if (is_broadcast_ether_addr(ethhdr->h_dest))
1174                 return -1;
1175
1176         /* packet with broadcast sender address */
1177         if (is_broadcast_ether_addr(ethhdr->h_source))
1178                 return -1;
1179
1180         /* not for me */
1181         if (!is_my_mac(ethhdr->h_dest))
1182                 return -1;
1183
1184         return 0;
1185 }
1186
1187 int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
1188                          int hdr_size)
1189 {
1190         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1191         struct orig_node *orig_node;
1192         struct neigh_node *router;
1193         struct batman_if *batman_if;
1194         uint8_t dstaddr[ETH_ALEN];
1195         struct unicast_packet *unicast_packet;
1196         struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
1197         int ret;
1198         struct sk_buff *new_skb;
1199
1200         unicast_packet = (struct unicast_packet *)skb->data;
1201
1202         /* TTL exceeded */
1203         if (unicast_packet->ttl < 2) {
1204                 pr_debug("Warning - can't forward unicast packet from %pM to "
1205                          "%pM: ttl exceeded\n", ethhdr->h_source,
1206                          unicast_packet->dest);
1207                 return NET_RX_DROP;
1208         }
1209
1210         /* get routing information */
1211         spin_lock_bh(&bat_priv->orig_hash_lock);
1212         rcu_read_lock();
1213         orig_node = ((struct orig_node *)
1214                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
1215                                unicast_packet->dest));
1216         rcu_read_unlock();
1217
1218         router = find_router(bat_priv, orig_node, recv_if);
1219
1220         if (!router) {
1221                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1222                 return NET_RX_DROP;
1223         }
1224
1225         /* don't lock while sending the packets ... we therefore
1226          * copy the required data before sending */
1227
1228         batman_if = router->if_incoming;
1229         memcpy(dstaddr, router->addr, ETH_ALEN);
1230
1231         spin_unlock_bh(&bat_priv->orig_hash_lock);
1232
1233         /* create a copy of the skb, if needed, to modify it. */
1234         if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1235                 return NET_RX_DROP;
1236
1237         unicast_packet = (struct unicast_packet *)skb->data;
1238
1239         if (unicast_packet->packet_type == BAT_UNICAST &&
1240             atomic_read(&bat_priv->fragmentation) &&
1241             skb->len > batman_if->net_dev->mtu)
1242                 return frag_send_skb(skb, bat_priv, batman_if,
1243                                      dstaddr);
1244
1245         if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
1246             frag_can_reassemble(skb, batman_if->net_dev->mtu)) {
1247
1248                 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1249
1250                 if (ret == NET_RX_DROP)
1251                         return NET_RX_DROP;
1252
1253                 /* packet was buffered for late merge */
1254                 if (!new_skb)
1255                         return NET_RX_SUCCESS;
1256
1257                 skb = new_skb;
1258                 unicast_packet = (struct unicast_packet *)skb->data;
1259         }
1260
1261         /* decrement ttl */
1262         unicast_packet->ttl--;
1263
1264         /* route it */
1265         send_skb_packet(skb, batman_if, dstaddr);
1266
1267         return NET_RX_SUCCESS;
1268 }
1269
1270 int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1271 {
1272         struct unicast_packet *unicast_packet;
1273         int hdr_size = sizeof(struct unicast_packet);
1274
1275         if (check_unicast_packet(skb, hdr_size) < 0)
1276                 return NET_RX_DROP;
1277
1278         unicast_packet = (struct unicast_packet *)skb->data;
1279
1280         /* packet for me */
1281         if (is_my_mac(unicast_packet->dest)) {
1282                 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1283                 return NET_RX_SUCCESS;
1284         }
1285
1286         return route_unicast_packet(skb, recv_if, hdr_size);
1287 }
1288
1289 int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
1290 {
1291         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1292         struct unicast_frag_packet *unicast_packet;
1293         int hdr_size = sizeof(struct unicast_frag_packet);
1294         struct sk_buff *new_skb = NULL;
1295         int ret;
1296
1297         if (check_unicast_packet(skb, hdr_size) < 0)
1298                 return NET_RX_DROP;
1299
1300         unicast_packet = (struct unicast_frag_packet *)skb->data;
1301
1302         /* packet for me */
1303         if (is_my_mac(unicast_packet->dest)) {
1304
1305                 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1306
1307                 if (ret == NET_RX_DROP)
1308                         return NET_RX_DROP;
1309
1310                 /* packet was buffered for late merge */
1311                 if (!new_skb)
1312                         return NET_RX_SUCCESS;
1313
1314                 interface_rx(recv_if->soft_iface, new_skb, recv_if,
1315                              sizeof(struct unicast_packet));
1316                 return NET_RX_SUCCESS;
1317         }
1318
1319         return route_unicast_packet(skb, recv_if, hdr_size);
1320 }
1321
1322
1323 int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1324 {
1325         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1326         struct orig_node *orig_node;
1327         struct bcast_packet *bcast_packet;
1328         struct ethhdr *ethhdr;
1329         int hdr_size = sizeof(struct bcast_packet);
1330         int32_t seq_diff;
1331
1332         /* drop packet if it has not necessary minimum size */
1333         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1334                 return NET_RX_DROP;
1335
1336         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1337
1338         /* packet with broadcast indication but unicast recipient */
1339         if (!is_broadcast_ether_addr(ethhdr->h_dest))
1340                 return NET_RX_DROP;
1341
1342         /* packet with broadcast sender address */
1343         if (is_broadcast_ether_addr(ethhdr->h_source))
1344                 return NET_RX_DROP;
1345
1346         /* ignore broadcasts sent by myself */
1347         if (is_my_mac(ethhdr->h_source))
1348                 return NET_RX_DROP;
1349
1350         bcast_packet = (struct bcast_packet *)skb->data;
1351
1352         /* ignore broadcasts originated by myself */
1353         if (is_my_mac(bcast_packet->orig))
1354                 return NET_RX_DROP;
1355
1356         if (bcast_packet->ttl < 2)
1357                 return NET_RX_DROP;
1358
1359         spin_lock_bh(&bat_priv->orig_hash_lock);
1360         rcu_read_lock();
1361         orig_node = ((struct orig_node *)
1362                      hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
1363                                bcast_packet->orig));
1364         rcu_read_unlock();
1365
1366         if (!orig_node) {
1367                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1368                 return NET_RX_DROP;
1369         }
1370
1371         /* check whether the packet is a duplicate */
1372         if (get_bit_status(orig_node->bcast_bits,
1373                            orig_node->last_bcast_seqno,
1374                            ntohl(bcast_packet->seqno))) {
1375                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1376                 return NET_RX_DROP;
1377         }
1378
1379         seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1380
1381         /* check whether the packet is old and the host just restarted. */
1382         if (window_protected(bat_priv, seq_diff,
1383                              &orig_node->bcast_seqno_reset)) {
1384                 spin_unlock_bh(&bat_priv->orig_hash_lock);
1385                 return NET_RX_DROP;
1386         }
1387
1388         /* mark broadcast in flood history, update window position
1389          * if required. */
1390         if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1391                 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1392
1393         spin_unlock_bh(&bat_priv->orig_hash_lock);
1394         /* rebroadcast packet */
1395         add_bcast_packet_to_list(bat_priv, skb);
1396
1397         /* broadcast for me */
1398         interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1399
1400         return NET_RX_SUCCESS;
1401 }
1402
1403 int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if)
1404 {
1405         struct vis_packet *vis_packet;
1406         struct ethhdr *ethhdr;
1407         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1408         int hdr_size = sizeof(struct vis_packet);
1409
1410         /* keep skb linear */
1411         if (skb_linearize(skb) < 0)
1412                 return NET_RX_DROP;
1413
1414         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1415                 return NET_RX_DROP;
1416
1417         vis_packet = (struct vis_packet *)skb->data;
1418         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1419
1420         /* not for me */
1421         if (!is_my_mac(ethhdr->h_dest))
1422                 return NET_RX_DROP;
1423
1424         /* ignore own packets */
1425         if (is_my_mac(vis_packet->vis_orig))
1426                 return NET_RX_DROP;
1427
1428         if (is_my_mac(vis_packet->sender_orig))
1429                 return NET_RX_DROP;
1430
1431         switch (vis_packet->vis_type) {
1432         case VIS_TYPE_SERVER_SYNC:
1433                 receive_server_sync_packet(bat_priv, vis_packet,
1434                                            skb_headlen(skb));
1435                 break;
1436
1437         case VIS_TYPE_CLIENT_UPDATE:
1438                 receive_client_update_packet(bat_priv, vis_packet,
1439                                              skb_headlen(skb));
1440                 break;
1441
1442         default:        /* ignore unknown packet */
1443                 break;
1444         }
1445
1446         /* We take a copy of the data in the packet, so we should
1447            always free the skbuf. */
1448         return NET_RX_DROP;
1449 }