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