drivers/staging/batman-adv/routing.c

   1 /*
   2  * Copyright (C) 2007-2009 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 "device.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 "compat.h"
  36
  37 DECLARE_WAIT_QUEUE_HEAD(thread_wait);
  38
  39 static atomic_t data_ready_cond;
  40 atomic_t exit_cond;
  41 void slide_own_bcast_window(struct batman_if *batman_if)
  42 {
  43         struct hash_it_t *hashit = NULL;
  44         struct orig_node *orig_node;
  45         TYPE_OF_WORD *word;
  46
  47         spin_lock(&orig_hash_lock);
  48
  49         while (NULL != (hashit = hash_iterate(orig_hash, hashit))) {
  50                 orig_node = hashit->bucket->data;
  51                 word = &(orig_node->bcast_own[batman_if->if_num * NUM_WORDS]);
  52
  53                 bit_get_packet(word, 1, 0);
  54                 orig_node->bcast_own_sum[batman_if->if_num] =
  55                         bit_packet_count(word);
  56         }
  57
  58         spin_unlock(&orig_hash_lock);
  59 }
  60
  61 static void update_HNA(struct orig_node *orig_node,
  62                        unsigned char *hna_buff, int hna_buff_len)
  63 {
  64         if ((hna_buff_len != orig_node->hna_buff_len) ||
  65             ((hna_buff_len > 0) &&
  66              (orig_node->hna_buff_len > 0) &&
  67              (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
  68
  69                 if (orig_node->hna_buff_len > 0)
  70                         hna_global_del_orig(orig_node,
  71                                             "originator changed hna");
  72
  73                 if ((hna_buff_len > 0) && (hna_buff != NULL))
  74                         hna_global_add_orig(orig_node, hna_buff, hna_buff_len);
  75         }
  76 }
  77
  78 static void update_route(struct orig_node *orig_node,
  79                          struct neigh_node *neigh_node,
  80                          unsigned char *hna_buff, int hna_buff_len)
  81 {
  82         char orig_str[ETH_STR_LEN], neigh_str[ETH_STR_LEN];
  83         char router_str[ETH_STR_LEN];
  84
  85         addr_to_string(orig_str, orig_node->orig);
  86
  87         /* route deleted */
  88         if ((orig_node->router != NULL) && (neigh_node == NULL)) {
  89
  90                 bat_dbg(DBG_ROUTES, "Deleting route towards: %s\n",
  91                         orig_str);
  92                 hna_global_del_orig(orig_node, "originator timed out");
  93
  94                 /* route added */
  95         } else if ((orig_node->router == NULL) && (neigh_node != NULL)) {
  96
  97                 addr_to_string(neigh_str, neigh_node->addr);
  98                 bat_dbg(DBG_ROUTES,
  99                         "Adding route towards: %s (via %s)\n",
 100                         orig_str, neigh_str);
 101                 hna_global_add_orig(orig_node, hna_buff, hna_buff_len);
 102
 103                 /* route changed */
 104         } else {
 105                 addr_to_string(neigh_str, neigh_node->addr);
 106                 addr_to_string(router_str, orig_node->router->addr);
 107                 bat_dbg(DBG_ROUTES, "Changing route towards: %s (now via %s - was via %s)\n", orig_str, neigh_str, router_str);
 108         }
 109
 110         if (neigh_node != NULL)
 111                 orig_node->batman_if = neigh_node->if_incoming;
 112         else
 113                 orig_node->batman_if = NULL;
 114
 115         orig_node->router = neigh_node;
 116 }
 117
 118
 119 void update_routes(struct orig_node *orig_node,
 120                           struct neigh_node *neigh_node,
 121                           unsigned char *hna_buff, int hna_buff_len)
 122 {
 123
 124         if (orig_node == NULL)
 125                 return;
 126
 127         if (orig_node->router != neigh_node)
 128                 update_route(orig_node, neigh_node, hna_buff, hna_buff_len);
 129         /* may be just HNA changed */
 130         else
 131                 update_HNA(orig_node, hna_buff, hna_buff_len);
 132 }
 133
 134 static int isBidirectionalNeigh(struct orig_node *orig_node,
 135                                 struct orig_node *orig_neigh_node,
 136                                 struct batman_packet *batman_packet,
 137                                 struct batman_if *if_incoming)
 138 {
 139         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 140         char orig_str[ETH_STR_LEN], neigh_str[ETH_STR_LEN];
 141         unsigned char total_count;
 142
 143         addr_to_string(orig_str, orig_node->orig);
 144         addr_to_string(neigh_str, orig_neigh_node->orig);
 145
 146         if (orig_node == orig_neigh_node) {
 147                 list_for_each_entry(tmp_neigh_node,
 148                                     &orig_node->neigh_list,
 149                                     list) {
 150
 151                         if (compare_orig(tmp_neigh_node->addr,
 152                                          orig_neigh_node->orig) &&
 153                             (tmp_neigh_node->if_incoming == if_incoming))
 154                                 neigh_node = tmp_neigh_node;
 155                 }
 156
 157                 if (neigh_node == NULL)
 158                         neigh_node = create_neighbor(orig_node,
 159                                                      orig_neigh_node,
 160                                                      orig_neigh_node->orig,
 161                                                      if_incoming);
 162
 163                 neigh_node->last_valid = jiffies;
 164         } else {
 165                 /* find packet count of corresponding one hop neighbor */
 166                 list_for_each_entry(tmp_neigh_node,
 167                                     &orig_neigh_node->neigh_list, list) {
 168
 169                         if (compare_orig(tmp_neigh_node->addr,
 170                                          orig_neigh_node->orig) &&
 171                             (tmp_neigh_node->if_incoming == if_incoming))
 172                                 neigh_node = tmp_neigh_node;
 173                 }
 174
 175                 if (neigh_node == NULL)
 176                         neigh_node = create_neighbor(orig_neigh_node,
 177                                                      orig_neigh_node,
 178                                                      orig_neigh_node->orig,
 179                                                      if_incoming);
 180         }
 181
 182         orig_node->last_valid = jiffies;
 183
 184         /* pay attention to not get a value bigger than 100 % */
 185         total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
 186                        neigh_node->real_packet_count ?
 187                        neigh_node->real_packet_count :
 188                        orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
 189
 190         /* if we have too few packets (too less data) we set tq_own to zero */
 191         /* if we receive too few packets it is not considered bidirectional */
 192         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
 193             (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
 194                 orig_neigh_node->tq_own = 0;
 195         else
 196                 /* neigh_node->real_packet_count is never zero as we
 197                  * only purge old information when getting new
 198                  * information */
 199                 orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
 200                         neigh_node->real_packet_count;
 201
 202         /*
 203          * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 204          * affect the nearly-symmetric links only a little, but
 205          * punishes asymmetric links more.  This will give a value
 206          * between 0 and TQ_MAX_VALUE
 207          */
 208         orig_neigh_node->tq_asym_penalty =
 209                 TQ_MAX_VALUE -
 210                 (TQ_MAX_VALUE *
 211                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 212                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
 213                  (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
 214                 (TQ_LOCAL_WINDOW_SIZE *
 215                  TQ_LOCAL_WINDOW_SIZE *
 216                  TQ_LOCAL_WINDOW_SIZE);
 217
 218         batman_packet->tq = ((batman_packet->tq *
 219                               orig_neigh_node->tq_own *
 220                               orig_neigh_node->tq_asym_penalty) /
 221                              (TQ_MAX_VALUE *     TQ_MAX_VALUE));
 222
 223         bat_dbg(DBG_BATMAN, "bidirectional: orig = %-15s neigh = %-15s => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i \n",
 224                 orig_str, neigh_str, total_count,
 225                 neigh_node->real_packet_count, orig_neigh_node->tq_own,
 226                 orig_neigh_node->tq_asym_penalty, batman_packet->tq);
 227
 228         /* if link has the minimum required transmission quality
 229          * consider it bidirectional */
 230         if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
 231                 return 1;
 232
 233         return 0;
 234 }
 235
 236 static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr,
 237                         struct batman_packet *batman_packet,
 238                         struct batman_if *if_incoming,
 239                         unsigned char *hna_buff, int hna_buff_len,
 240                         char is_duplicate)
 241 {
 242         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 243         int tmp_hna_buff_len;
 244
 245         bat_dbg(DBG_BATMAN, "update_originator(): Searching and updating originator entry of received packet \n");
 246
 247         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 248                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 249                     (tmp_neigh_node->if_incoming == if_incoming)) {
 250                         neigh_node = tmp_neigh_node;
 251                         continue;
 252                 }
 253
 254                 if (is_duplicate)
 255                         continue;
 256
 257                 ring_buffer_set(tmp_neigh_node->tq_recv,
 258                                 &tmp_neigh_node->tq_index, 0);
 259                 tmp_neigh_node->tq_avg =
 260                         ring_buffer_avg(tmp_neigh_node->tq_recv);
 261         }
 262
 263         if (neigh_node == NULL)
 264                 neigh_node = create_neighbor(orig_node,
 265                                              get_orig_node(ethhdr->h_source),
 266                                              ethhdr->h_source, if_incoming);
 267         else
 268                 bat_dbg(DBG_BATMAN,
 269                         "Updating existing last-hop neighbour of originator\n");
 270
 271         orig_node->flags = batman_packet->flags;
 272         neigh_node->last_valid = jiffies;
 273
 274         ring_buffer_set(neigh_node->tq_recv,
 275                         &neigh_node->tq_index,
 276                         batman_packet->tq);
 277         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
 278
 279         if (!is_duplicate) {
 280                 orig_node->last_ttl = batman_packet->ttl;
 281                 neigh_node->last_ttl = batman_packet->ttl;
 282         }
 283
 284         tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
 285                             batman_packet->num_hna * ETH_ALEN : hna_buff_len);
 286
 287         /* if this neighbor already is our next hop there is nothing
 288          * to change */
 289         if (orig_node->router == neigh_node)
 290                 goto update_hna;
 291
 292         /* if this neighbor does not offer a better TQ we won't consider it */
 293         if ((orig_node->router) &&
 294             (orig_node->router->tq_avg > neigh_node->tq_avg))
 295                 goto update_hna;
 296
 297         /* if the TQ is the same and the link not more symetric we
 298          * won't consider it either */
 299         if ((orig_node->router) &&
 300              ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
 301              (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
 302               >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
 303                 goto update_hna;
 304
 305         update_routes(orig_node, neigh_node, hna_buff, tmp_hna_buff_len);
 306         return;
 307
 308 update_hna:
 309         update_routes(orig_node, orig_node->router, hna_buff, tmp_hna_buff_len);
 310         return;
 311 }
 312
 313 static char count_real_packets(struct ethhdr *ethhdr,
 314                                struct batman_packet *batman_packet,
 315                                struct batman_if *if_incoming)
 316 {
 317         struct orig_node *orig_node;
 318         struct neigh_node *tmp_neigh_node;
 319         char is_duplicate = 0;
 320         uint16_t seq_diff;
 321
 322         orig_node = get_orig_node(batman_packet->orig);
 323         if (orig_node == NULL)
 324                 return 0;
 325
 326         list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
 327
 328                 if (!is_duplicate)
 329                         is_duplicate =
 330                                 get_bit_status(tmp_neigh_node->real_bits,
 331                                                orig_node->last_real_seqno,
 332                                                batman_packet->seqno);
 333                 seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
 334                 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
 335                     (tmp_neigh_node->if_incoming == if_incoming))
 336                         bit_get_packet(tmp_neigh_node->real_bits, seq_diff, 1);
 337                 else
 338                         bit_get_packet(tmp_neigh_node->real_bits, seq_diff, 0);
 339
 340                 tmp_neigh_node->real_packet_count =
 341                         bit_packet_count(tmp_neigh_node->real_bits);
 342         }
 343
 344         if (!is_duplicate) {
 345                 bat_dbg(DBG_BATMAN, "updating last_seqno: old %d, new %d \n",
 346                         orig_node->last_real_seqno, batman_packet->seqno);
 347                 orig_node->last_real_seqno = batman_packet->seqno;
 348         }
 349
 350         return is_duplicate;
 351 }
 352
 353 void receive_bat_packet(struct ethhdr *ethhdr,
 354                         struct batman_packet *batman_packet,
 355                         unsigned char *hna_buff,
 356                         int hna_buff_len,
 357                         struct batman_if *if_incoming)
 358 {
 359         struct batman_if *batman_if;
 360         struct orig_node *orig_neigh_node, *orig_node;
 361         char orig_str[ETH_STR_LEN], prev_sender_str[ETH_STR_LEN];
 362         char neigh_str[ETH_STR_LEN];
 363         char has_directlink_flag;
 364         char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 365         char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
 366         char is_duplicate;
 367         unsigned short if_incoming_seqno;
 368
 369         /* Silently drop when the batman packet is actually not a
 370          * correct packet.
 371          *
 372          * This might happen if a packet is padded (e.g. Ethernet has a
 373          * minimum frame length of 64 byte) and the aggregation interprets
 374          * it as an additional length.
 375          *
 376          * TODO: A more sane solution would be to have a bit in the
 377          * batman_packet to detect whether the packet is the last
 378          * packet in an aggregation.  Here we expect that the padding
 379          * is always zero (or not 0x01)
 380          */
 381         if (batman_packet->packet_type != BAT_PACKET)
 382                 return;
 383
 384         /* could be changed by schedule_own_packet() */
 385         if_incoming_seqno = atomic_read(&if_incoming->seqno);
 386
 387         addr_to_string(orig_str, batman_packet->orig);
 388         addr_to_string(prev_sender_str, batman_packet->prev_sender);
 389         addr_to_string(neigh_str, ethhdr->h_source);
 390
 391         has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
 392
 393         is_single_hop_neigh = (compare_orig(ethhdr->h_source,
 394                                             batman_packet->orig) ? 1 : 0);
 395
 396         bat_dbg(DBG_BATMAN, "Received BATMAN packet via NB: %s, IF: %s [%s] (from OG: %s, via prev OG: %s, seqno %d, tq %d, TTL %d, V %d, IDF %d) \n",
 397                 neigh_str, if_incoming->dev, if_incoming->addr_str,
 398                 orig_str, prev_sender_str, batman_packet->seqno,
 399                 batman_packet->tq, batman_packet->ttl, batman_packet->version,
 400                 has_directlink_flag);
 401
 402         list_for_each_entry_rcu(batman_if, &if_list, list) {
 403                 if (batman_if->if_active != IF_ACTIVE)
 404                         continue;
 405
 406                 if (compare_orig(ethhdr->h_source,
 407                                  batman_if->net_dev->dev_addr))
 408                         is_my_addr = 1;
 409
 410                 if (compare_orig(batman_packet->orig,
 411                                  batman_if->net_dev->dev_addr))
 412                         is_my_orig = 1;
 413
 414                 if (compare_orig(batman_packet->prev_sender,
 415                                  batman_if->net_dev->dev_addr))
 416                         is_my_oldorig = 1;
 417
 418                 if (compare_orig(ethhdr->h_source, broadcastAddr))
 419                         is_broadcast = 1;
 420         }
 421
 422         if (batman_packet->version != COMPAT_VERSION) {
 423                 bat_dbg(DBG_BATMAN,
 424                         "Drop packet: incompatible batman version (%i)\n",
 425                         batman_packet->version);
 426                 return;
 427         }
 428
 429         if (is_my_addr) {
 430                 bat_dbg(DBG_BATMAN,
 431                         "Drop packet: received my own broadcast (sender: %s)\n",
 432                         neigh_str);
 433                 return;
 434         }
 435
 436         if (is_broadcast) {
 437                 bat_dbg(DBG_BATMAN, "Drop packet: ignoring all packets with broadcast source addr (sender: %s) \n", neigh_str);
 438                 return;
 439         }
 440
 441         if (is_my_orig) {
 442                 TYPE_OF_WORD *word;
 443                 int offset;
 444
 445                 orig_neigh_node = get_orig_node(ethhdr->h_source);
 446
 447                 /* neighbour has to indicate direct link and it has to
 448                  * come via the corresponding interface */
 449                 /* if received seqno equals last send seqno save new
 450                  * seqno for bidirectional check */
 451                 if (has_directlink_flag &&
 452                     compare_orig(if_incoming->net_dev->dev_addr,
 453                                  batman_packet->orig) &&
 454                     (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
 455                         offset = if_incoming->if_num * NUM_WORDS;
 456                         word = &(orig_neigh_node->bcast_own[offset]);
 457                         bit_mark(word, 0);
 458                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
 459                                 bit_packet_count(word);
 460                 }
 461
 462                 bat_dbg(DBG_BATMAN, "Drop packet: originator packet from myself (via neighbour) \n");
 463                 return;
 464         }
 465
 466         if (batman_packet->tq == 0) {
 467                 count_real_packets(ethhdr, batman_packet, if_incoming);
 468
 469                 bat_dbg(DBG_BATMAN, "Drop packet: originator packet with tq equal 0 \n");
 470                 return;
 471         }
 472
 473         if (is_my_oldorig) {
 474                 bat_dbg(DBG_BATMAN, "Drop packet: ignoring all rebroadcast echos (sender: %s) \n", neigh_str);
 475                 return;
 476         }
 477
 478         is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
 479
 480         orig_node = get_orig_node(batman_packet->orig);
 481         if (orig_node == NULL)
 482                 return;
 483
 484         /* avoid temporary routing loops */
 485         if ((orig_node->router) &&
 486             (orig_node->router->orig_node->router) &&
 487             (compare_orig(orig_node->router->addr,
 488                           batman_packet->prev_sender)) &&
 489             !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
 490             (compare_orig(orig_node->router->addr,
 491                           orig_node->router->orig_node->router->addr))) {
 492                 bat_dbg(DBG_BATMAN, "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %s) \n", neigh_str);
 493                 return;
 494         }
 495
 496         /* if sender is a direct neighbor the sender mac equals
 497          * originator mac */
 498         orig_neigh_node = (is_single_hop_neigh ?
 499                            orig_node : get_orig_node(ethhdr->h_source));
 500         if (orig_neigh_node == NULL)
 501                 return;
 502
 503         /* drop packet if sender is not a direct neighbor and if we
 504          * don't route towards it */
 505         if (!is_single_hop_neigh &&
 506             (orig_neigh_node->router == NULL)) {
 507                 bat_dbg(DBG_BATMAN, "Drop packet: OGM via unknown neighbor!\n");
 508                 return;
 509         }
 510
 511         is_bidirectional = isBidirectionalNeigh(orig_node, orig_neigh_node,
 512                                                 batman_packet, if_incoming);
 513
 514         /* update ranking if it is not a duplicate or has the same
 515          * seqno and similar ttl as the non-duplicate */
 516         if (is_bidirectional &&
 517             (!is_duplicate ||
 518              ((orig_node->last_real_seqno == batman_packet->seqno) &&
 519               (orig_node->last_ttl - 3 <= batman_packet->ttl))))
 520                 update_orig(orig_node, ethhdr, batman_packet,
 521                             if_incoming, hna_buff, hna_buff_len, is_duplicate);
 522
 523         /* is single hop (direct) neighbour */
 524         if (is_single_hop_neigh) {
 525
 526                 /* mark direct link on incoming interface */
 527                 schedule_forward_packet(orig_node, ethhdr, batman_packet,
 528                                         1, hna_buff_len, if_incoming);
 529
 530                 bat_dbg(DBG_BATMAN, "Forwarding packet: rebroadcast neighbour packet with direct link flag\n");
 531                 return;
 532         }
 533
 534         /* multihop originator */
 535         if (!is_bidirectional) {
 536                 bat_dbg(DBG_BATMAN,
 537                         "Drop packet: not received via bidirectional link\n");
 538                 return;
 539         }
 540
 541         if (is_duplicate) {
 542                 bat_dbg(DBG_BATMAN, "Drop packet: duplicate packet received\n");
 543                 return;
 544         }
 545
 546         bat_dbg(DBG_BATMAN,
 547                 "Forwarding packet: rebroadcast originator packet\n");
 548         schedule_forward_packet(orig_node, ethhdr, batman_packet,
 549                                 0, hna_buff_len, if_incoming);
 550 }
 551
 552
 553 static int receive_raw_packet(struct socket *raw_sock,
 554                               unsigned char *packet_buff, int packet_buff_len)
 555 {
 556         struct kvec iov;
 557         struct msghdr msg;
 558
 559         iov.iov_base = packet_buff;
 560         iov.iov_len = packet_buff_len;
 561
 562         msg.msg_flags = MSG_DONTWAIT;   /* non-blocking */
 563         msg.msg_name = NULL;
 564         msg.msg_namelen = 0;
 565         msg.msg_control = NULL;
 566
 567         return kernel_recvmsg(raw_sock, &msg, &iov, 1, packet_buff_len,
 568                               MSG_DONTWAIT);
 569 }
 570
 571 static void recv_bat_packet(struct ethhdr *ethhdr,
 572                             unsigned char *packet_buff,
 573                             int result,
 574                             struct batman_if *batman_if)
 575 {
 576         /* packet with broadcast indication but unicast recipient */
 577         if (!is_bcast(ethhdr->h_dest))
 578                 return;
 579
 580         /* packet with broadcast sender address */
 581         if (is_bcast(ethhdr->h_source))
 582                 return;
 583
 584         /* drop packet if it has not at least one batman packet as payload */
 585         if (result < sizeof(struct ethhdr) + sizeof(struct batman_packet))
 586                 return;
 587
 588         spin_lock(&orig_hash_lock);
 589         receive_aggr_bat_packet(ethhdr,
 590                                 packet_buff + sizeof(struct ethhdr),
 591                                 result - sizeof(struct ethhdr),
 592                                 batman_if);
 593         spin_unlock(&orig_hash_lock);
 594 }
 595
 596 static void recv_my_icmp_packet(struct ethhdr *ethhdr,
 597                                 struct icmp_packet *icmp_packet,
 598                                 unsigned char *packet_buff,
 599                                 int result)
 600 {
 601         struct orig_node *orig_node;
 602
 603         /* add data to device queue */
 604         if (icmp_packet->msg_type != ECHO_REQUEST) {
 605                 bat_device_receive_packet(icmp_packet);
 606                 return;
 607         }
 608
 609         /* answer echo request (ping) */
 610         /* get routing information */
 611         spin_lock(&orig_hash_lock);
 612         orig_node = ((struct orig_node *)hash_find(orig_hash,
 613                                                    icmp_packet->orig));
 614
 615         if ((orig_node != NULL) &&
 616             (orig_node->batman_if != NULL) &&
 617             (orig_node->router != NULL)) {
 618                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 619                 memcpy(icmp_packet->orig, ethhdr->h_dest, ETH_ALEN);
 620                 icmp_packet->msg_type = ECHO_REPLY;
 621                 icmp_packet->ttl = TTL;
 622
 623                 send_raw_packet(packet_buff + sizeof(struct ethhdr),
 624                                 result - sizeof(struct ethhdr),
 625                                 orig_node->batman_if,
 626                                 orig_node->router->addr);
 627         }
 628
 629         spin_unlock(&orig_hash_lock);
 630         return;
 631 }
 632
 633 static void recv_icmp_ttl_exceeded(struct icmp_packet *icmp_packet,
 634                                    struct ethhdr *ethhdr,
 635                                    unsigned char *packet_buff,
 636                                    int result,
 637                                    struct batman_if *batman_if)
 638 {
 639         unsigned char src_str[ETH_STR_LEN], dst_str[ETH_STR_LEN];
 640         struct orig_node *orig_node;
 641
 642         addr_to_string(src_str, icmp_packet->orig);
 643         addr_to_string(dst_str, icmp_packet->dst);
 644
 645         printk(KERN_WARNING "batman-adv:Warning - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str);
 646
 647         /* send TTL exceeded if packet is an echo request (traceroute) */
 648         if (icmp_packet->msg_type != ECHO_REQUEST)
 649                 return;
 650
 651         /* get routing information */
 652         spin_lock(&orig_hash_lock);
 653         orig_node = ((struct orig_node *)
 654                      hash_find(orig_hash, icmp_packet->orig));
 655
 656         if ((orig_node != NULL) &&
 657             (orig_node->batman_if != NULL) &&
 658             (orig_node->router != NULL)) {
 659                 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
 660                 memcpy(icmp_packet->orig, ethhdr->h_dest, ETH_ALEN);
 661                 icmp_packet->msg_type = TTL_EXCEEDED;
 662                 icmp_packet->ttl = TTL;
 663
 664                 send_raw_packet(packet_buff + sizeof(struct ethhdr),
 665                                 result - sizeof(struct ethhdr),
 666                                 orig_node->batman_if,
 667                                 orig_node->router->addr);
 668
 669         }
 670
 671         spin_unlock(&orig_hash_lock);
 672 }
 673
 674
 675
 676 static void recv_icmp_packet(struct ethhdr *ethhdr,
 677                              unsigned char *packet_buff,
 678                              int result,
 679                              struct batman_if *batman_if)
 680 {
 681         struct icmp_packet *icmp_packet;
 682         struct orig_node *orig_node;
 683
 684         /* packet with unicast indication but broadcast recipient */
 685         if (is_bcast(ethhdr->h_dest))
 686                 return;
 687
 688         /* packet with broadcast sender address */
 689         if (is_bcast(ethhdr->h_source))
 690                 return;
 691
 692         /* not for me */
 693         if (!is_my_mac(ethhdr->h_dest))
 694                 return;
 695
 696         /* drop packet if it has not necessary minimum size */
 697         if (result < sizeof(struct ethhdr) + sizeof(struct icmp_packet))
 698                 return;
 699
 700         icmp_packet = (struct icmp_packet *)
 701                 (packet_buff + sizeof(struct ethhdr));
 702
 703         /* packet for me */
 704         if (is_my_mac(icmp_packet->dst))
 705                 recv_my_icmp_packet(ethhdr, icmp_packet, packet_buff, result);
 706
 707         /* TTL exceeded */
 708         if (icmp_packet->ttl < 2) {
 709                 recv_icmp_ttl_exceeded(icmp_packet, ethhdr, packet_buff, result,
 710                                        batman_if);
 711                 return;
 712
 713         }
 714
 715         /* get routing information */
 716         spin_lock(&orig_hash_lock);
 717         orig_node = ((struct orig_node *)
 718                      hash_find(orig_hash, icmp_packet->dst));
 719
 720         if ((orig_node != NULL) &&
 721             (orig_node->batman_if != NULL) &&
 722             (orig_node->router != NULL)) {
 723
 724                 /* decrement ttl */
 725                 icmp_packet->ttl--;
 726
 727                 /* route it */
 728                 send_raw_packet(packet_buff + sizeof(struct ethhdr),
 729                                 result - sizeof(struct ethhdr),
 730                                 orig_node->batman_if,
 731                                 orig_node->router->addr);
 732         }
 733         spin_unlock(&orig_hash_lock);
 734 }
 735
 736 static void recv_unicast_packet(struct ethhdr *ethhdr,
 737                                 unsigned char *packet_buff,
 738                                 int result,
 739                                 struct batman_if *batman_if)
 740 {
 741         struct unicast_packet *unicast_packet;
 742         unsigned char src_str[ETH_STR_LEN], dst_str[ETH_STR_LEN];
 743         struct orig_node *orig_node;
 744         int hdr_size = sizeof(struct ethhdr) + sizeof(struct unicast_packet);
 745
 746         /* packet with unicast indication but broadcast recipient */
 747         if (is_bcast(ethhdr->h_dest))
 748                 return;
 749
 750         /* packet with broadcast sender address */
 751         if (is_bcast(ethhdr->h_source))
 752                 return;
 753
 754         /* not for me */
 755         if (!is_my_mac(ethhdr->h_dest))
 756                 return;
 757
 758         /* drop packet if it has not necessary minimum size */
 759         if (result < hdr_size)
 760                 return;
 761
 762         unicast_packet = (struct unicast_packet *)
 763                 (packet_buff + sizeof(struct ethhdr));
 764
 765         /* packet for me */
 766         if (is_my_mac(unicast_packet->dest)) {
 767                 interface_rx(soft_device, packet_buff + hdr_size,
 768                              result - hdr_size);
 769                 return;
 770
 771         }
 772
 773         /* TTL exceeded */
 774         if (unicast_packet->ttl < 2) {
 775                 addr_to_string(src_str, ((struct ethhdr *)
 776                                          (unicast_packet + 1))->h_source);
 777                 addr_to_string(dst_str, unicast_packet->dest);
 778
 779                 printk(KERN_WARNING "batman-adv:Warning - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str);
 780                 return;
 781         }
 782
 783         /* get routing information */
 784         spin_lock(&orig_hash_lock);
 785         orig_node = ((struct orig_node *)
 786                      hash_find(orig_hash, unicast_packet->dest));
 787
 788         if ((orig_node != NULL) &&
 789             (orig_node->batman_if != NULL) &&
 790             (orig_node->router != NULL)) {
 791                 /* decrement ttl */
 792                 unicast_packet->ttl--;
 793
 794                 /* route it */
 795                 send_raw_packet(packet_buff + sizeof(struct ethhdr),
 796                                 result - sizeof(struct ethhdr),
 797                                 orig_node->batman_if,
 798                                 orig_node->router->addr);
 799         }
 800         spin_unlock(&orig_hash_lock);
 801 }
 802
 803
 804 static void recv_bcast_packet(struct ethhdr *ethhdr,
 805                               unsigned char *packet_buff,
 806                               int result,
 807                               struct batman_if *batman_if)
 808 {
 809         struct orig_node *orig_node;
 810         struct bcast_packet *bcast_packet;
 811         int hdr_size = sizeof(struct ethhdr) + sizeof(struct bcast_packet);
 812
 813         /* packet with broadcast indication but unicast recipient */
 814         if (!is_bcast(ethhdr->h_dest))
 815                 return;
 816
 817         /* packet with broadcast sender address */
 818         if (is_bcast(ethhdr->h_source))
 819                 return;
 820
 821         /* drop packet if it has not necessary minimum size */
 822         if (result < hdr_size)
 823                 return;
 824
 825         /* ignore broadcasts sent by myself */
 826         if (is_my_mac(ethhdr->h_source))
 827                 return;
 828
 829         bcast_packet = (struct bcast_packet *)
 830                 (packet_buff + sizeof(struct ethhdr));
 831
 832         /* ignore broadcasts originated by myself */
 833         if (is_my_mac(bcast_packet->orig))
 834                 return;
 835
 836         spin_lock(&orig_hash_lock);
 837         orig_node = ((struct orig_node *)
 838                      hash_find(orig_hash, bcast_packet->orig));
 839
 840         if (orig_node == NULL) {
 841                 spin_unlock(&orig_hash_lock);
 842                 return;
 843         }
 844
 845         /* check flood history */
 846         if (get_bit_status(orig_node->bcast_bits,
 847                            orig_node->last_bcast_seqno,
 848                            ntohs(bcast_packet->seqno))) {
 849                 spin_unlock(&orig_hash_lock);
 850                 return;
 851         }
 852
 853         /* mark broadcast in flood history */
 854         if (bit_get_packet(orig_node->bcast_bits,
 855                            ntohs(bcast_packet->seqno) -
 856                            orig_node->last_bcast_seqno, 1))
 857                 orig_node->last_bcast_seqno = ntohs(bcast_packet->seqno);
 858
 859         spin_unlock(&orig_hash_lock);
 860
 861         /* broadcast for me */
 862         interface_rx(soft_device, packet_buff + hdr_size, result - hdr_size);
 863
 864         /* rebroadcast packet */
 865         add_bcast_packet_to_list(packet_buff + sizeof(struct ethhdr),
 866                                  result - sizeof(struct ethhdr));
 867 }
 868
 869 static void recv_vis_packet(struct ethhdr *ethhdr,
 870                             unsigned char *packet_buff,
 871                             int result)
 872 {
 873         struct vis_packet *vis_packet;
 874         int hdr_size = sizeof(struct ethhdr) + sizeof(struct vis_packet);
 875         int vis_info_len;
 876
 877         /* drop if too short. */
 878         if (result < hdr_size)
 879                 return;
 880
 881         /* not for me */
 882         if (!is_my_mac(ethhdr->h_dest))
 883                 return;
 884
 885         vis_packet = (struct vis_packet *)(packet_buff + sizeof(struct ethhdr));
 886         vis_info_len = result  - hdr_size;
 887
 888         /* ignore own packets */
 889         if (is_my_mac(vis_packet->vis_orig))
 890                 return;
 891
 892         if (is_my_mac(vis_packet->sender_orig))
 893                 return;
 894
 895         switch (vis_packet->vis_type) {
 896         case VIS_TYPE_SERVER_SYNC:
 897                 receive_server_sync_packet(vis_packet, vis_info_len);
 898                 break;
 899
 900         case VIS_TYPE_CLIENT_UPDATE:
 901                 receive_client_update_packet(vis_packet, vis_info_len);
 902                 break;
 903
 904         default:        /* ignore unknown packet */
 905                 break;
 906         }
 907 }
 908
 909 static int recv_one_packet(struct batman_if *batman_if,
 910                            unsigned char *packet_buff)
 911 {
 912         int result;
 913         struct ethhdr *ethhdr;
 914         struct batman_packet *batman_packet;
 915
 916         result = receive_raw_packet(batman_if->raw_sock, packet_buff,
 917                                     PACKBUFF_SIZE);
 918         if (result <= 0)
 919                 return result;
 920
 921         if (result < sizeof(struct ethhdr) + 2)
 922                 return 0;
 923
 924         ethhdr = (struct ethhdr *)packet_buff;
 925         batman_packet = (struct batman_packet *)
 926                 (packet_buff + sizeof(struct ethhdr));
 927
 928         if (batman_packet->version != COMPAT_VERSION) {
 929                 bat_dbg(DBG_BATMAN,
 930                         "Drop packet: incompatible batman version (%i)\n",
 931                         batman_packet->version);
 932                 return 0;
 933         }
 934
 935         switch (batman_packet->packet_type) {
 936                 /* batman originator packet */
 937         case BAT_PACKET:
 938                 recv_bat_packet(ethhdr, packet_buff, result, batman_if);
 939                 break;
 940
 941                 /* batman icmp packet */
 942         case BAT_ICMP:
 943                 recv_icmp_packet(ethhdr, packet_buff, result, batman_if);
 944                 break;
 945
 946                 /* unicast packet */
 947         case BAT_UNICAST:
 948                 recv_unicast_packet(ethhdr, packet_buff, result, batman_if);
 949                 break;
 950
 951                 /* broadcast packet */
 952         case BAT_BCAST:
 953                 recv_bcast_packet(ethhdr,
 954                                   packet_buff, result, batman_if);
 955                 break;
 956
 957                 /* vis packet */
 958         case BAT_VIS:
 959                 recv_vis_packet(ethhdr, packet_buff, result);
 960                 break;
 961         }
 962         return 0;
 963 }
 964
 965
 966 static int discard_one_packet(struct batman_if *batman_if,
 967                               unsigned char *packet_buff)
 968 {
 969         int result = -EAGAIN;
 970
 971         if (batman_if->raw_sock) {
 972                 result = receive_raw_packet(batman_if->raw_sock,
 973                                             packet_buff,
 974                                             PACKBUFF_SIZE);
 975         }
 976         return result;
 977 }
 978
 979
 980 static bool is_interface_active(struct batman_if *batman_if)
 981 {
 982         if (batman_if->if_active != IF_ACTIVE)
 983                 return false;
 984
 985         return true;
 986 }
 987
 988 static void service_interface(struct batman_if *batman_if,
 989                               unsigned char *packet_buff)
 990
 991 {
 992         int result;
 993
 994         do {
 995                 if (is_interface_active(batman_if))
 996                         result = recv_one_packet(batman_if, packet_buff);
 997                 else
 998                         result = discard_one_packet(batman_if, packet_buff);
 999         } while (result >= 0);
1000
1001         /* we perform none blocking reads, so EAGAIN indicates there
1002            are no more packets to read. Anything else is a real
1003            error.*/
1004
1005         if ((result < 0) && (result != -EAGAIN))
1006                 printk(KERN_ERR "batman-adv:Could not receive packet from interface %s: %i\n", batman_if->dev, result);
1007 }
1008
1009 static void service_interfaces(unsigned char *packet_buffer)
1010 {
1011         struct batman_if *batman_if;
1012         rcu_read_lock();
1013         list_for_each_entry_rcu(batman_if, &if_list, list) {
1014                 rcu_read_unlock();
1015                 service_interface(batman_if, packet_buffer);
1016                 rcu_read_lock();
1017         }
1018         rcu_read_unlock();
1019 }
1020
1021
1022 int packet_recv_thread(void *data)
1023 {
1024         unsigned char *packet_buff;
1025
1026         atomic_set(&data_ready_cond, 0);
1027         atomic_set(&exit_cond, 0);
1028         packet_buff = kmalloc(PACKBUFF_SIZE, GFP_KERNEL);
1029         if (!packet_buff) {
1030                 printk(KERN_ERR"batman-adv:Could allocate memory for the packet buffer. :(\n");
1031                 return -1;
1032         }
1033
1034         while ((!kthread_should_stop()) && (!atomic_read(&exit_cond))) {
1035
1036                 wait_event_interruptible(thread_wait,
1037                                          (atomic_read(&data_ready_cond) ||
1038                                           atomic_read(&exit_cond)));
1039
1040                 atomic_set(&data_ready_cond, 0);
1041
1042                 if (kthread_should_stop() || atomic_read(&exit_cond))
1043                         break;
1044
1045                 service_interfaces(packet_buff);
1046         }
1047         kfree(packet_buff);
1048
1049         /* do not exit until kthread_stop() is actually called,
1050          * otherwise it will wait for us forever. */
1051         while (!kthread_should_stop())
1052                 schedule();
1053
1054         return 0;
1055 }
1056
1057 void batman_data_ready(struct sock *sk, int len)
1058 {
1059         void (*data_ready)(struct sock *, int) = sk->sk_user_data;
1060
1061         data_ready(sk, len);
1062
1063         atomic_set(&data_ready_cond, 1);
1064         wake_up_interruptible(&thread_wait);
1065 }
1066