1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: 2 * 3 * Marek Lindner, Simon Wunderlich 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of version 2 of the GNU General Public 7 * License as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 17 * 02110-1301, USA 18 */ 19 20 #include "main.h" 21 #include "translation-table.h" 22 #include "ring_buffer.h" 23 #include "originator.h" 24 #include "routing.h" 25 #include "gateway_common.h" 26 #include "gateway_client.h" 27 #include "hard-interface.h" 28 #include "send.h" 29 #include "bat_algo.h" 30 31 static struct batadv_neigh_node * 32 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, 33 const uint8_t *neigh_addr, 34 struct batadv_orig_node *orig_node, 35 struct batadv_orig_node *orig_neigh, __be32 seqno) 36 { 37 struct batadv_neigh_node *neigh_node; 38 39 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, 40 ntohl(seqno)); 41 if (!neigh_node) 42 goto out; 43 44 INIT_LIST_HEAD(&neigh_node->bonding_list); 45 46 neigh_node->orig_node = orig_neigh; 47 neigh_node->if_incoming = hard_iface; 48 49 spin_lock_bh(&orig_node->neigh_list_lock); 50 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); 51 spin_unlock_bh(&orig_node->neigh_list_lock); 52 53 out: 54 return neigh_node; 55 } 56 57 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) 58 { 59 struct batadv_ogm_packet *batadv_ogm_packet; 60 unsigned char *ogm_buff; 61 uint32_t random_seqno; 62 int res = -ENOMEM; 63 64 /* randomize initial seqno to avoid collision */ 65 get_random_bytes(&random_seqno, sizeof(random_seqno)); 66 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); 67 68 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; 69 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); 70 if (!ogm_buff) 71 goto out; 72 73 hard_iface->bat_iv.ogm_buff = ogm_buff; 74 75 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 76 batadv_ogm_packet->header.packet_type = BATADV_IV_OGM; 77 batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION; 78 batadv_ogm_packet->header.ttl = 2; 79 batadv_ogm_packet->flags = BATADV_NO_FLAGS; 80 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; 81 batadv_ogm_packet->tt_num_changes = 0; 82 batadv_ogm_packet->ttvn = 0; 83 84 res = 0; 85 86 out: 87 return res; 88 } 89 90 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) 91 { 92 kfree(hard_iface->bat_iv.ogm_buff); 93 hard_iface->bat_iv.ogm_buff = NULL; 94 } 95 96 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) 97 { 98 struct batadv_ogm_packet *batadv_ogm_packet; 99 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; 100 101 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 102 memcpy(batadv_ogm_packet->orig, 103 hard_iface->net_dev->dev_addr, ETH_ALEN); 104 memcpy(batadv_ogm_packet->prev_sender, 105 hard_iface->net_dev->dev_addr, ETH_ALEN); 106 } 107 108 static void 109 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) 110 { 111 struct batadv_ogm_packet *batadv_ogm_packet; 112 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; 113 114 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 115 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; 116 batadv_ogm_packet->header.ttl = BATADV_TTL; 117 } 118 119 /* when do we schedule our own ogm to be sent */ 120 static unsigned long 121 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) 122 { 123 unsigned int msecs; 124 125 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; 126 msecs += random32() % (2 * BATADV_JITTER); 127 128 return jiffies + msecs_to_jiffies(msecs); 129 } 130 131 /* when do we schedule a ogm packet to be sent */ 132 static unsigned long batadv_iv_ogm_fwd_send_time(void) 133 { 134 return jiffies + msecs_to_jiffies(random32() % (BATADV_JITTER / 2)); 135 } 136 137 /* apply hop penalty for a normal link */ 138 static uint8_t batadv_hop_penalty(uint8_t tq, 139 const struct batadv_priv *bat_priv) 140 { 141 int hop_penalty = atomic_read(&bat_priv->hop_penalty); 142 int new_tq; 143 144 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); 145 new_tq /= BATADV_TQ_MAX_VALUE; 146 147 return new_tq; 148 } 149 150 /* is there another aggregated packet here? */ 151 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, 152 int tt_num_changes) 153 { 154 int next_buff_pos = 0; 155 156 next_buff_pos += buff_pos + BATADV_OGM_HLEN; 157 next_buff_pos += batadv_tt_len(tt_num_changes); 158 159 return (next_buff_pos <= packet_len) && 160 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); 161 } 162 163 /* send a batman ogm to a given interface */ 164 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, 165 struct batadv_hard_iface *hard_iface) 166 { 167 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 168 char *fwd_str; 169 uint8_t packet_num; 170 int16_t buff_pos; 171 struct batadv_ogm_packet *batadv_ogm_packet; 172 struct sk_buff *skb; 173 uint8_t *packet_pos; 174 175 if (hard_iface->if_status != BATADV_IF_ACTIVE) 176 return; 177 178 packet_num = 0; 179 buff_pos = 0; 180 packet_pos = forw_packet->skb->data; 181 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 182 183 /* adjust all flags and log packets */ 184 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, 185 batadv_ogm_packet->tt_num_changes)) { 186 187 /* we might have aggregated direct link packets with an 188 * ordinary base packet 189 */ 190 if (forw_packet->direct_link_flags & BIT(packet_num) && 191 forw_packet->if_incoming == hard_iface) 192 batadv_ogm_packet->flags |= BATADV_DIRECTLINK; 193 else 194 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; 195 196 if (packet_num > 0 || !forw_packet->own) 197 fwd_str = "Forwarding"; 198 else 199 fwd_str = "Sending own"; 200 201 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 202 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n", 203 fwd_str, (packet_num > 0 ? "aggregated " : ""), 204 batadv_ogm_packet->orig, 205 ntohl(batadv_ogm_packet->seqno), 206 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl, 207 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 208 "on" : "off"), 209 batadv_ogm_packet->ttvn, hard_iface->net_dev->name, 210 hard_iface->net_dev->dev_addr); 211 212 buff_pos += BATADV_OGM_HLEN; 213 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); 214 packet_num++; 215 packet_pos = forw_packet->skb->data + buff_pos; 216 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 217 } 218 219 /* create clone because function is called more than once */ 220 skb = skb_clone(forw_packet->skb, GFP_ATOMIC); 221 if (skb) { 222 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); 223 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, 224 skb->len + ETH_HLEN); 225 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); 226 } 227 } 228 229 /* send a batman ogm packet */ 230 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) 231 { 232 struct batadv_hard_iface *hard_iface; 233 struct net_device *soft_iface; 234 struct batadv_priv *bat_priv; 235 struct batadv_hard_iface *primary_if = NULL; 236 struct batadv_ogm_packet *batadv_ogm_packet; 237 unsigned char directlink; 238 uint8_t *packet_pos; 239 240 packet_pos = forw_packet->skb->data; 241 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 242 directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0); 243 244 if (!forw_packet->if_incoming) { 245 pr_err("Error - can't forward packet: incoming iface not specified\n"); 246 goto out; 247 } 248 249 soft_iface = forw_packet->if_incoming->soft_iface; 250 bat_priv = netdev_priv(soft_iface); 251 252 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) 253 goto out; 254 255 primary_if = batadv_primary_if_get_selected(bat_priv); 256 if (!primary_if) 257 goto out; 258 259 /* multihomed peer assumed 260 * non-primary OGMs are only broadcasted on their interface 261 */ 262 if ((directlink && (batadv_ogm_packet->header.ttl == 1)) || 263 (forw_packet->own && (forw_packet->if_incoming != primary_if))) { 264 265 /* FIXME: what about aggregated packets ? */ 266 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 267 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", 268 (forw_packet->own ? "Sending own" : "Forwarding"), 269 batadv_ogm_packet->orig, 270 ntohl(batadv_ogm_packet->seqno), 271 batadv_ogm_packet->header.ttl, 272 forw_packet->if_incoming->net_dev->name, 273 forw_packet->if_incoming->net_dev->dev_addr); 274 275 /* skb is only used once and than forw_packet is free'd */ 276 batadv_send_skb_packet(forw_packet->skb, 277 forw_packet->if_incoming, 278 batadv_broadcast_addr); 279 forw_packet->skb = NULL; 280 281 goto out; 282 } 283 284 /* broadcast on every interface */ 285 rcu_read_lock(); 286 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 287 if (hard_iface->soft_iface != soft_iface) 288 continue; 289 290 batadv_iv_ogm_send_to_if(forw_packet, hard_iface); 291 } 292 rcu_read_unlock(); 293 294 out: 295 if (primary_if) 296 batadv_hardif_free_ref(primary_if); 297 } 298 299 /* return true if new_packet can be aggregated with forw_packet */ 300 static bool 301 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, 302 struct batadv_priv *bat_priv, 303 int packet_len, unsigned long send_time, 304 bool directlink, 305 const struct batadv_hard_iface *if_incoming, 306 const struct batadv_forw_packet *forw_packet) 307 { 308 struct batadv_ogm_packet *batadv_ogm_packet; 309 int aggregated_bytes = forw_packet->packet_len + packet_len; 310 struct batadv_hard_iface *primary_if = NULL; 311 bool res = false; 312 unsigned long aggregation_end_time; 313 314 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; 315 aggregation_end_time = send_time; 316 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); 317 318 /* we can aggregate the current packet to this aggregated packet 319 * if: 320 * 321 * - the send time is within our MAX_AGGREGATION_MS time 322 * - the resulting packet wont be bigger than 323 * MAX_AGGREGATION_BYTES 324 */ 325 if (time_before(send_time, forw_packet->send_time) && 326 time_after_eq(aggregation_end_time, forw_packet->send_time) && 327 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) { 328 329 /* check aggregation compatibility 330 * -> direct link packets are broadcasted on 331 * their interface only 332 * -> aggregate packet if the current packet is 333 * a "global" packet as well as the base 334 * packet 335 */ 336 primary_if = batadv_primary_if_get_selected(bat_priv); 337 if (!primary_if) 338 goto out; 339 340 /* packets without direct link flag and high TTL 341 * are flooded through the net 342 */ 343 if ((!directlink) && 344 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) && 345 (batadv_ogm_packet->header.ttl != 1) && 346 347 /* own packets originating non-primary 348 * interfaces leave only that interface 349 */ 350 ((!forw_packet->own) || 351 (forw_packet->if_incoming == primary_if))) { 352 res = true; 353 goto out; 354 } 355 356 /* if the incoming packet is sent via this one 357 * interface only - we still can aggregate 358 */ 359 if ((directlink) && 360 (new_bat_ogm_packet->header.ttl == 1) && 361 (forw_packet->if_incoming == if_incoming) && 362 363 /* packets from direct neighbors or 364 * own secondary interface packets 365 * (= secondary interface packets in general) 366 */ 367 (batadv_ogm_packet->flags & BATADV_DIRECTLINK || 368 (forw_packet->own && 369 forw_packet->if_incoming != primary_if))) { 370 res = true; 371 goto out; 372 } 373 } 374 375 out: 376 if (primary_if) 377 batadv_hardif_free_ref(primary_if); 378 return res; 379 } 380 381 /* create a new aggregated packet and add this packet to it */ 382 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, 383 int packet_len, unsigned long send_time, 384 bool direct_link, 385 struct batadv_hard_iface *if_incoming, 386 int own_packet) 387 { 388 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 389 struct batadv_forw_packet *forw_packet_aggr; 390 unsigned char *skb_buff; 391 unsigned int skb_size; 392 393 if (!atomic_inc_not_zero(&if_incoming->refcount)) 394 return; 395 396 /* own packet should always be scheduled */ 397 if (!own_packet) { 398 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { 399 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 400 "batman packet queue full\n"); 401 goto out; 402 } 403 } 404 405 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); 406 if (!forw_packet_aggr) { 407 if (!own_packet) 408 atomic_inc(&bat_priv->batman_queue_left); 409 goto out; 410 } 411 412 if ((atomic_read(&bat_priv->aggregated_ogms)) && 413 (packet_len < BATADV_MAX_AGGREGATION_BYTES)) 414 skb_size = BATADV_MAX_AGGREGATION_BYTES; 415 else 416 skb_size = packet_len; 417 418 skb_size += ETH_HLEN + NET_IP_ALIGN; 419 420 forw_packet_aggr->skb = dev_alloc_skb(skb_size); 421 if (!forw_packet_aggr->skb) { 422 if (!own_packet) 423 atomic_inc(&bat_priv->batman_queue_left); 424 kfree(forw_packet_aggr); 425 goto out; 426 } 427 skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN); 428 429 INIT_HLIST_NODE(&forw_packet_aggr->list); 430 431 skb_buff = skb_put(forw_packet_aggr->skb, packet_len); 432 forw_packet_aggr->packet_len = packet_len; 433 memcpy(skb_buff, packet_buff, packet_len); 434 435 forw_packet_aggr->own = own_packet; 436 forw_packet_aggr->if_incoming = if_incoming; 437 forw_packet_aggr->num_packets = 0; 438 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; 439 forw_packet_aggr->send_time = send_time; 440 441 /* save packet direct link flag status */ 442 if (direct_link) 443 forw_packet_aggr->direct_link_flags |= 1; 444 445 /* add new packet to packet list */ 446 spin_lock_bh(&bat_priv->forw_bat_list_lock); 447 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); 448 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 449 450 /* start timer for this packet */ 451 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, 452 batadv_send_outstanding_bat_ogm_packet); 453 queue_delayed_work(batadv_event_workqueue, 454 &forw_packet_aggr->delayed_work, 455 send_time - jiffies); 456 457 return; 458 out: 459 batadv_hardif_free_ref(if_incoming); 460 } 461 462 /* aggregate a new packet into the existing ogm packet */ 463 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, 464 const unsigned char *packet_buff, 465 int packet_len, bool direct_link) 466 { 467 unsigned char *skb_buff; 468 unsigned long new_direct_link_flag; 469 470 skb_buff = skb_put(forw_packet_aggr->skb, packet_len); 471 memcpy(skb_buff, packet_buff, packet_len); 472 forw_packet_aggr->packet_len += packet_len; 473 forw_packet_aggr->num_packets++; 474 475 /* save packet direct link flag status */ 476 if (direct_link) { 477 new_direct_link_flag = BIT(forw_packet_aggr->num_packets); 478 forw_packet_aggr->direct_link_flags |= new_direct_link_flag; 479 } 480 } 481 482 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, 483 unsigned char *packet_buff, 484 int packet_len, 485 struct batadv_hard_iface *if_incoming, 486 int own_packet, unsigned long send_time) 487 { 488 /* _aggr -> pointer to the packet we want to aggregate with 489 * _pos -> pointer to the position in the queue 490 */ 491 struct batadv_forw_packet *forw_packet_aggr = NULL; 492 struct batadv_forw_packet *forw_packet_pos = NULL; 493 struct hlist_node *tmp_node; 494 struct batadv_ogm_packet *batadv_ogm_packet; 495 bool direct_link; 496 unsigned long max_aggregation_jiffies; 497 498 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; 499 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0; 500 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); 501 502 /* find position for the packet in the forward queue */ 503 spin_lock_bh(&bat_priv->forw_bat_list_lock); 504 /* own packets are not to be aggregated */ 505 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { 506 hlist_for_each_entry(forw_packet_pos, tmp_node, 507 &bat_priv->forw_bat_list, list) { 508 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, 509 bat_priv, packet_len, 510 send_time, direct_link, 511 if_incoming, 512 forw_packet_pos)) { 513 forw_packet_aggr = forw_packet_pos; 514 break; 515 } 516 } 517 } 518 519 /* nothing to aggregate with - either aggregation disabled or no 520 * suitable aggregation packet found 521 */ 522 if (!forw_packet_aggr) { 523 /* the following section can run without the lock */ 524 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 525 526 /* if we could not aggregate this packet with one of the others 527 * we hold it back for a while, so that it might be aggregated 528 * later on 529 */ 530 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) 531 send_time += max_aggregation_jiffies; 532 533 batadv_iv_ogm_aggregate_new(packet_buff, packet_len, 534 send_time, direct_link, 535 if_incoming, own_packet); 536 } else { 537 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, 538 packet_len, direct_link); 539 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 540 } 541 } 542 543 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, 544 const struct ethhdr *ethhdr, 545 struct batadv_ogm_packet *batadv_ogm_packet, 546 bool is_single_hop_neigh, 547 bool is_from_best_next_hop, 548 struct batadv_hard_iface *if_incoming) 549 { 550 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 551 uint8_t tt_num_changes; 552 553 if (batadv_ogm_packet->header.ttl <= 1) { 554 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); 555 return; 556 } 557 558 if (!is_from_best_next_hop) { 559 /* Mark the forwarded packet when it is not coming from our 560 * best next hop. We still need to forward the packet for our 561 * neighbor link quality detection to work in case the packet 562 * originated from a single hop neighbor. Otherwise we can 563 * simply drop the ogm. 564 */ 565 if (is_single_hop_neigh) 566 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; 567 else 568 return; 569 } 570 571 tt_num_changes = batadv_ogm_packet->tt_num_changes; 572 573 batadv_ogm_packet->header.ttl--; 574 memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); 575 576 /* apply hop penalty */ 577 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, 578 bat_priv); 579 580 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 581 "Forwarding packet: tq: %i, ttl: %i\n", 582 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl); 583 584 /* switch of primaries first hop flag when forwarding */ 585 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; 586 if (is_single_hop_neigh) 587 batadv_ogm_packet->flags |= BATADV_DIRECTLINK; 588 else 589 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; 590 591 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, 592 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes), 593 if_incoming, 0, batadv_iv_ogm_fwd_send_time()); 594 } 595 596 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) 597 { 598 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 599 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; 600 struct batadv_ogm_packet *batadv_ogm_packet; 601 struct batadv_hard_iface *primary_if; 602 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; 603 int vis_server, tt_num_changes = 0; 604 uint32_t seqno; 605 uint8_t bandwidth; 606 607 vis_server = atomic_read(&bat_priv->vis_mode); 608 primary_if = batadv_primary_if_get_selected(bat_priv); 609 610 if (hard_iface == primary_if) 611 tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff, 612 ogm_buff_len, 613 BATADV_OGM_HLEN); 614 615 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); 616 617 /* change sequence number to network order */ 618 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno); 619 batadv_ogm_packet->seqno = htonl(seqno); 620 atomic_inc(&hard_iface->bat_iv.ogm_seqno); 621 622 batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn); 623 batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc); 624 if (tt_num_changes >= 0) 625 batadv_ogm_packet->tt_num_changes = tt_num_changes; 626 627 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC) 628 batadv_ogm_packet->flags |= BATADV_VIS_SERVER; 629 else 630 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER; 631 632 if (hard_iface == primary_if && 633 atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) { 634 bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth); 635 batadv_ogm_packet->gw_flags = bandwidth; 636 } else { 637 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS; 638 } 639 640 batadv_slide_own_bcast_window(hard_iface); 641 batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff, 642 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1, 643 batadv_iv_ogm_emit_send_time(bat_priv)); 644 645 if (primary_if) 646 batadv_hardif_free_ref(primary_if); 647 } 648 649 static void 650 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, 651 struct batadv_orig_node *orig_node, 652 const struct ethhdr *ethhdr, 653 const struct batadv_ogm_packet *batadv_ogm_packet, 654 struct batadv_hard_iface *if_incoming, 655 const unsigned char *tt_buff, 656 int is_duplicate) 657 { 658 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; 659 struct batadv_neigh_node *router = NULL; 660 struct batadv_orig_node *orig_node_tmp; 661 struct hlist_node *node; 662 int if_num; 663 uint8_t sum_orig, sum_neigh; 664 uint8_t *neigh_addr; 665 uint8_t tq_avg; 666 667 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 668 "update_originator(): Searching and updating originator entry of received packet\n"); 669 670 rcu_read_lock(); 671 hlist_for_each_entry_rcu(tmp_neigh_node, node, 672 &orig_node->neigh_list, list) { 673 neigh_addr = tmp_neigh_node->addr; 674 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && 675 tmp_neigh_node->if_incoming == if_incoming && 676 atomic_inc_not_zero(&tmp_neigh_node->refcount)) { 677 if (neigh_node) 678 batadv_neigh_node_free_ref(neigh_node); 679 neigh_node = tmp_neigh_node; 680 continue; 681 } 682 683 if (is_duplicate) 684 continue; 685 686 spin_lock_bh(&tmp_neigh_node->lq_update_lock); 687 batadv_ring_buffer_set(tmp_neigh_node->tq_recv, 688 &tmp_neigh_node->tq_index, 0); 689 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); 690 tmp_neigh_node->tq_avg = tq_avg; 691 spin_unlock_bh(&tmp_neigh_node->lq_update_lock); 692 } 693 694 if (!neigh_node) { 695 struct batadv_orig_node *orig_tmp; 696 697 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); 698 if (!orig_tmp) 699 goto unlock; 700 701 neigh_node = batadv_iv_ogm_neigh_new(if_incoming, 702 ethhdr->h_source, 703 orig_node, orig_tmp, 704 batadv_ogm_packet->seqno); 705 706 batadv_orig_node_free_ref(orig_tmp); 707 if (!neigh_node) 708 goto unlock; 709 } else 710 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 711 "Updating existing last-hop neighbor of originator\n"); 712 713 rcu_read_unlock(); 714 715 orig_node->flags = batadv_ogm_packet->flags; 716 neigh_node->last_seen = jiffies; 717 718 spin_lock_bh(&neigh_node->lq_update_lock); 719 batadv_ring_buffer_set(neigh_node->tq_recv, 720 &neigh_node->tq_index, 721 batadv_ogm_packet->tq); 722 neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); 723 spin_unlock_bh(&neigh_node->lq_update_lock); 724 725 if (!is_duplicate) { 726 orig_node->last_ttl = batadv_ogm_packet->header.ttl; 727 neigh_node->last_ttl = batadv_ogm_packet->header.ttl; 728 } 729 730 batadv_bonding_candidate_add(orig_node, neigh_node); 731 732 /* if this neighbor already is our next hop there is nothing 733 * to change 734 */ 735 router = batadv_orig_node_get_router(orig_node); 736 if (router == neigh_node) 737 goto update_tt; 738 739 /* if this neighbor does not offer a better TQ we won't consider it */ 740 if (router && (router->tq_avg > neigh_node->tq_avg)) 741 goto update_tt; 742 743 /* if the TQ is the same and the link not more symmetric we 744 * won't consider it either 745 */ 746 if (router && (neigh_node->tq_avg == router->tq_avg)) { 747 orig_node_tmp = router->orig_node; 748 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); 749 if_num = router->if_incoming->if_num; 750 sum_orig = orig_node_tmp->bcast_own_sum[if_num]; 751 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); 752 753 orig_node_tmp = neigh_node->orig_node; 754 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); 755 if_num = neigh_node->if_incoming->if_num; 756 sum_neigh = orig_node_tmp->bcast_own_sum[if_num]; 757 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); 758 759 if (sum_orig >= sum_neigh) 760 goto update_tt; 761 } 762 763 batadv_update_route(bat_priv, orig_node, neigh_node); 764 765 update_tt: 766 /* I have to check for transtable changes only if the OGM has been 767 * sent through a primary interface 768 */ 769 if (((batadv_ogm_packet->orig != ethhdr->h_source) && 770 (batadv_ogm_packet->header.ttl > 2)) || 771 (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) 772 batadv_tt_update_orig(bat_priv, orig_node, tt_buff, 773 batadv_ogm_packet->tt_num_changes, 774 batadv_ogm_packet->ttvn, 775 ntohs(batadv_ogm_packet->tt_crc)); 776 777 if (orig_node->gw_flags != batadv_ogm_packet->gw_flags) 778 batadv_gw_node_update(bat_priv, orig_node, 779 batadv_ogm_packet->gw_flags); 780 781 orig_node->gw_flags = batadv_ogm_packet->gw_flags; 782 783 /* restart gateway selection if fast or late switching was enabled */ 784 if ((orig_node->gw_flags) && 785 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && 786 (atomic_read(&bat_priv->gw_sel_class) > 2)) 787 batadv_gw_check_election(bat_priv, orig_node); 788 789 goto out; 790 791 unlock: 792 rcu_read_unlock(); 793 out: 794 if (neigh_node) 795 batadv_neigh_node_free_ref(neigh_node); 796 if (router) 797 batadv_neigh_node_free_ref(router); 798 } 799 800 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, 801 struct batadv_orig_node *orig_neigh_node, 802 struct batadv_ogm_packet *batadv_ogm_packet, 803 struct batadv_hard_iface *if_incoming) 804 { 805 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 806 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; 807 struct hlist_node *node; 808 uint8_t total_count; 809 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; 810 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; 811 int tq_asym_penalty, inv_asym_penalty, ret = 0; 812 unsigned int combined_tq; 813 814 /* find corresponding one hop neighbor */ 815 rcu_read_lock(); 816 hlist_for_each_entry_rcu(tmp_neigh_node, node, 817 &orig_neigh_node->neigh_list, list) { 818 819 if (!batadv_compare_eth(tmp_neigh_node->addr, 820 orig_neigh_node->orig)) 821 continue; 822 823 if (tmp_neigh_node->if_incoming != if_incoming) 824 continue; 825 826 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) 827 continue; 828 829 neigh_node = tmp_neigh_node; 830 break; 831 } 832 rcu_read_unlock(); 833 834 if (!neigh_node) 835 neigh_node = batadv_iv_ogm_neigh_new(if_incoming, 836 orig_neigh_node->orig, 837 orig_neigh_node, 838 orig_neigh_node, 839 batadv_ogm_packet->seqno); 840 841 if (!neigh_node) 842 goto out; 843 844 /* if orig_node is direct neighbor update neigh_node last_seen */ 845 if (orig_node == orig_neigh_node) 846 neigh_node->last_seen = jiffies; 847 848 orig_node->last_seen = jiffies; 849 850 /* find packet count of corresponding one hop neighbor */ 851 spin_lock_bh(&orig_node->ogm_cnt_lock); 852 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; 853 neigh_rq_count = neigh_node->real_packet_count; 854 spin_unlock_bh(&orig_node->ogm_cnt_lock); 855 856 /* pay attention to not get a value bigger than 100 % */ 857 if (orig_eq_count > neigh_rq_count) 858 total_count = neigh_rq_count; 859 else 860 total_count = orig_eq_count; 861 862 /* if we have too few packets (too less data) we set tq_own to zero 863 * if we receive too few packets it is not considered bidirectional 864 */ 865 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || 866 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) 867 tq_own = 0; 868 else 869 /* neigh_node->real_packet_count is never zero as we 870 * only purge old information when getting new 871 * information 872 */ 873 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; 874 875 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does 876 * affect the nearly-symmetric links only a little, but 877 * punishes asymmetric links more. This will give a value 878 * between 0 and TQ_MAX_VALUE 879 */ 880 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; 881 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; 882 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * 883 BATADV_TQ_LOCAL_WINDOW_SIZE * 884 BATADV_TQ_LOCAL_WINDOW_SIZE; 885 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; 886 inv_asym_penalty /= neigh_rq_max_cube; 887 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; 888 889 combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty; 890 combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE; 891 batadv_ogm_packet->tq = combined_tq; 892 893 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 894 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", 895 orig_node->orig, orig_neigh_node->orig, total_count, 896 neigh_rq_count, tq_own, 897 tq_asym_penalty, batadv_ogm_packet->tq); 898 899 /* if link has the minimum required transmission quality 900 * consider it bidirectional 901 */ 902 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) 903 ret = 1; 904 905 out: 906 if (neigh_node) 907 batadv_neigh_node_free_ref(neigh_node); 908 return ret; 909 } 910 911 /* processes a batman packet for all interfaces, adjusts the sequence number and 912 * finds out whether it is a duplicate. 913 * returns: 914 * 1 the packet is a duplicate 915 * 0 the packet has not yet been received 916 * -1 the packet is old and has been received while the seqno window 917 * was protected. Caller should drop it. 918 */ 919 static int 920 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, 921 const struct batadv_ogm_packet *batadv_ogm_packet, 922 const struct batadv_hard_iface *if_incoming) 923 { 924 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 925 struct batadv_orig_node *orig_node; 926 struct batadv_neigh_node *tmp_neigh_node; 927 struct hlist_node *node; 928 int is_duplicate = 0; 929 int32_t seq_diff; 930 int need_update = 0; 931 int set_mark, ret = -1; 932 uint32_t seqno = ntohl(batadv_ogm_packet->seqno); 933 uint8_t *neigh_addr; 934 uint8_t packet_count; 935 936 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); 937 if (!orig_node) 938 return 0; 939 940 spin_lock_bh(&orig_node->ogm_cnt_lock); 941 seq_diff = seqno - orig_node->last_real_seqno; 942 943 /* signalize caller that the packet is to be dropped. */ 944 if (!hlist_empty(&orig_node->neigh_list) && 945 batadv_window_protected(bat_priv, seq_diff, 946 &orig_node->batman_seqno_reset)) 947 goto out; 948 949 rcu_read_lock(); 950 hlist_for_each_entry_rcu(tmp_neigh_node, node, 951 &orig_node->neigh_list, list) { 952 953 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits, 954 orig_node->last_real_seqno, 955 seqno); 956 957 neigh_addr = tmp_neigh_node->addr; 958 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && 959 tmp_neigh_node->if_incoming == if_incoming) 960 set_mark = 1; 961 else 962 set_mark = 0; 963 964 /* if the window moved, set the update flag. */ 965 need_update |= batadv_bit_get_packet(bat_priv, 966 tmp_neigh_node->real_bits, 967 seq_diff, set_mark); 968 969 packet_count = bitmap_weight(tmp_neigh_node->real_bits, 970 BATADV_TQ_LOCAL_WINDOW_SIZE); 971 tmp_neigh_node->real_packet_count = packet_count; 972 } 973 rcu_read_unlock(); 974 975 if (need_update) { 976 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 977 "updating last_seqno: old %u, new %u\n", 978 orig_node->last_real_seqno, seqno); 979 orig_node->last_real_seqno = seqno; 980 } 981 982 ret = is_duplicate; 983 984 out: 985 spin_unlock_bh(&orig_node->ogm_cnt_lock); 986 batadv_orig_node_free_ref(orig_node); 987 return ret; 988 } 989 990 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, 991 struct batadv_ogm_packet *batadv_ogm_packet, 992 const unsigned char *tt_buff, 993 struct batadv_hard_iface *if_incoming) 994 { 995 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 996 struct batadv_hard_iface *hard_iface; 997 struct batadv_orig_node *orig_neigh_node, *orig_node; 998 struct batadv_neigh_node *router = NULL, *router_router = NULL; 999 struct batadv_neigh_node *orig_neigh_router = NULL; 1000 int has_directlink_flag; 1001 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; 1002 int is_broadcast = 0, is_bidirect; 1003 bool is_single_hop_neigh = false; 1004 bool is_from_best_next_hop = false; 1005 int is_duplicate, sameseq, simlar_ttl; 1006 uint32_t if_incoming_seqno; 1007 uint8_t *prev_sender; 1008 1009 /* Silently drop when the batman packet is actually not a 1010 * correct packet. 1011 * 1012 * This might happen if a packet is padded (e.g. Ethernet has a 1013 * minimum frame length of 64 byte) and the aggregation interprets 1014 * it as an additional length. 1015 * 1016 * TODO: A more sane solution would be to have a bit in the 1017 * batadv_ogm_packet to detect whether the packet is the last 1018 * packet in an aggregation. Here we expect that the padding 1019 * is always zero (or not 0x01) 1020 */ 1021 if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM) 1022 return; 1023 1024 /* could be changed by schedule_own_packet() */ 1025 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); 1026 1027 if (batadv_ogm_packet->flags & BATADV_DIRECTLINK) 1028 has_directlink_flag = 1; 1029 else 1030 has_directlink_flag = 0; 1031 1032 if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig)) 1033 is_single_hop_neigh = true; 1034 1035 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1036 "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n", 1037 ethhdr->h_source, if_incoming->net_dev->name, 1038 if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig, 1039 batadv_ogm_packet->prev_sender, 1040 ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn, 1041 ntohs(batadv_ogm_packet->tt_crc), 1042 batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq, 1043 batadv_ogm_packet->header.ttl, 1044 batadv_ogm_packet->header.version, has_directlink_flag); 1045 1046 rcu_read_lock(); 1047 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 1048 if (hard_iface->if_status != BATADV_IF_ACTIVE) 1049 continue; 1050 1051 if (hard_iface->soft_iface != if_incoming->soft_iface) 1052 continue; 1053 1054 if (batadv_compare_eth(ethhdr->h_source, 1055 hard_iface->net_dev->dev_addr)) 1056 is_my_addr = 1; 1057 1058 if (batadv_compare_eth(batadv_ogm_packet->orig, 1059 hard_iface->net_dev->dev_addr)) 1060 is_my_orig = 1; 1061 1062 if (batadv_compare_eth(batadv_ogm_packet->prev_sender, 1063 hard_iface->net_dev->dev_addr)) 1064 is_my_oldorig = 1; 1065 1066 if (is_broadcast_ether_addr(ethhdr->h_source)) 1067 is_broadcast = 1; 1068 } 1069 rcu_read_unlock(); 1070 1071 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { 1072 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1073 "Drop packet: incompatible batman version (%i)\n", 1074 batadv_ogm_packet->header.version); 1075 return; 1076 } 1077 1078 if (is_my_addr) { 1079 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1080 "Drop packet: received my own broadcast (sender: %pM)\n", 1081 ethhdr->h_source); 1082 return; 1083 } 1084 1085 if (is_broadcast) { 1086 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1087 "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n", 1088 ethhdr->h_source); 1089 return; 1090 } 1091 1092 if (is_my_orig) { 1093 unsigned long *word; 1094 int offset; 1095 int32_t bit_pos; 1096 int16_t if_num; 1097 uint8_t *weight; 1098 1099 orig_neigh_node = batadv_get_orig_node(bat_priv, 1100 ethhdr->h_source); 1101 if (!orig_neigh_node) 1102 return; 1103 1104 /* neighbor has to indicate direct link and it has to 1105 * come via the corresponding interface 1106 * save packet seqno for bidirectional check 1107 */ 1108 if (has_directlink_flag && 1109 batadv_compare_eth(if_incoming->net_dev->dev_addr, 1110 batadv_ogm_packet->orig)) { 1111 if_num = if_incoming->if_num; 1112 offset = if_num * BATADV_NUM_WORDS; 1113 1114 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); 1115 word = &(orig_neigh_node->bcast_own[offset]); 1116 bit_pos = if_incoming_seqno - 2; 1117 bit_pos -= ntohl(batadv_ogm_packet->seqno); 1118 batadv_set_bit(word, bit_pos); 1119 weight = &orig_neigh_node->bcast_own_sum[if_num]; 1120 *weight = bitmap_weight(word, 1121 BATADV_TQ_LOCAL_WINDOW_SIZE); 1122 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); 1123 } 1124 1125 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1126 "Drop packet: originator packet from myself (via neighbor)\n"); 1127 batadv_orig_node_free_ref(orig_neigh_node); 1128 return; 1129 } 1130 1131 if (is_my_oldorig) { 1132 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1133 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", 1134 ethhdr->h_source); 1135 return; 1136 } 1137 1138 if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { 1139 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1140 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", 1141 ethhdr->h_source); 1142 return; 1143 } 1144 1145 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); 1146 if (!orig_node) 1147 return; 1148 1149 is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet, 1150 if_incoming); 1151 1152 if (is_duplicate == -1) { 1153 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1154 "Drop packet: packet within seqno protection time (sender: %pM)\n", 1155 ethhdr->h_source); 1156 goto out; 1157 } 1158 1159 if (batadv_ogm_packet->tq == 0) { 1160 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1161 "Drop packet: originator packet with tq equal 0\n"); 1162 goto out; 1163 } 1164 1165 router = batadv_orig_node_get_router(orig_node); 1166 if (router) 1167 router_router = batadv_orig_node_get_router(router->orig_node); 1168 1169 if ((router && router->tq_avg != 0) && 1170 (batadv_compare_eth(router->addr, ethhdr->h_source))) 1171 is_from_best_next_hop = true; 1172 1173 prev_sender = batadv_ogm_packet->prev_sender; 1174 /* avoid temporary routing loops */ 1175 if (router && router_router && 1176 (batadv_compare_eth(router->addr, prev_sender)) && 1177 !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) && 1178 (batadv_compare_eth(router->addr, router_router->addr))) { 1179 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1180 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", 1181 ethhdr->h_source); 1182 goto out; 1183 } 1184 1185 /* if sender is a direct neighbor the sender mac equals 1186 * originator mac 1187 */ 1188 if (is_single_hop_neigh) 1189 orig_neigh_node = orig_node; 1190 else 1191 orig_neigh_node = batadv_get_orig_node(bat_priv, 1192 ethhdr->h_source); 1193 1194 if (!orig_neigh_node) 1195 goto out; 1196 1197 orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); 1198 1199 /* drop packet if sender is not a direct neighbor and if we 1200 * don't route towards it 1201 */ 1202 if (!is_single_hop_neigh && (!orig_neigh_router)) { 1203 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1204 "Drop packet: OGM via unknown neighbor!\n"); 1205 goto out_neigh; 1206 } 1207 1208 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, 1209 batadv_ogm_packet, if_incoming); 1210 1211 batadv_bonding_save_primary(orig_node, orig_neigh_node, 1212 batadv_ogm_packet); 1213 1214 /* update ranking if it is not a duplicate or has the same 1215 * seqno and similar ttl as the non-duplicate 1216 */ 1217 sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno); 1218 simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl; 1219 if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl))) 1220 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, 1221 batadv_ogm_packet, if_incoming, 1222 tt_buff, is_duplicate); 1223 1224 /* is single hop (direct) neighbor */ 1225 if (is_single_hop_neigh) { 1226 1227 /* mark direct link on incoming interface */ 1228 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, 1229 is_single_hop_neigh, 1230 is_from_best_next_hop, if_incoming); 1231 1232 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1233 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); 1234 goto out_neigh; 1235 } 1236 1237 /* multihop originator */ 1238 if (!is_bidirect) { 1239 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1240 "Drop packet: not received via bidirectional link\n"); 1241 goto out_neigh; 1242 } 1243 1244 if (is_duplicate) { 1245 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1246 "Drop packet: duplicate packet received\n"); 1247 goto out_neigh; 1248 } 1249 1250 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1251 "Forwarding packet: rebroadcast originator packet\n"); 1252 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, 1253 is_single_hop_neigh, is_from_best_next_hop, 1254 if_incoming); 1255 1256 out_neigh: 1257 if ((orig_neigh_node) && (!is_single_hop_neigh)) 1258 batadv_orig_node_free_ref(orig_neigh_node); 1259 out: 1260 if (router) 1261 batadv_neigh_node_free_ref(router); 1262 if (router_router) 1263 batadv_neigh_node_free_ref(router_router); 1264 if (orig_neigh_router) 1265 batadv_neigh_node_free_ref(orig_neigh_router); 1266 1267 batadv_orig_node_free_ref(orig_node); 1268 } 1269 1270 static int batadv_iv_ogm_receive(struct sk_buff *skb, 1271 struct batadv_hard_iface *if_incoming) 1272 { 1273 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1274 struct batadv_ogm_packet *batadv_ogm_packet; 1275 struct ethhdr *ethhdr; 1276 int buff_pos = 0, packet_len; 1277 unsigned char *tt_buff, *packet_buff; 1278 bool ret; 1279 uint8_t *packet_pos; 1280 1281 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); 1282 if (!ret) 1283 return NET_RX_DROP; 1284 1285 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface 1286 * that does not have B.A.T.M.A.N. IV enabled ? 1287 */ 1288 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) 1289 return NET_RX_DROP; 1290 1291 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); 1292 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, 1293 skb->len + ETH_HLEN); 1294 1295 packet_len = skb_headlen(skb); 1296 ethhdr = (struct ethhdr *)skb_mac_header(skb); 1297 packet_buff = skb->data; 1298 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; 1299 1300 /* unpack the aggregated packets and process them one by one */ 1301 do { 1302 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN; 1303 1304 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff, 1305 if_incoming); 1306 1307 buff_pos += BATADV_OGM_HLEN; 1308 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); 1309 1310 packet_pos = packet_buff + buff_pos; 1311 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 1312 } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, 1313 batadv_ogm_packet->tt_num_changes)); 1314 1315 kfree_skb(skb); 1316 return NET_RX_SUCCESS; 1317 } 1318 1319 static struct batadv_algo_ops batadv_batman_iv __read_mostly = { 1320 .name = "BATMAN_IV", 1321 .bat_iface_enable = batadv_iv_ogm_iface_enable, 1322 .bat_iface_disable = batadv_iv_ogm_iface_disable, 1323 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, 1324 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, 1325 .bat_ogm_schedule = batadv_iv_ogm_schedule, 1326 .bat_ogm_emit = batadv_iv_ogm_emit, 1327 }; 1328 1329 int __init batadv_iv_init(void) 1330 { 1331 int ret; 1332 1333 /* batman originator packet */ 1334 ret = batadv_recv_handler_register(BATADV_IV_OGM, 1335 batadv_iv_ogm_receive); 1336 if (ret < 0) 1337 goto out; 1338 1339 ret = batadv_algo_register(&batadv_batman_iv); 1340 if (ret < 0) 1341 goto handler_unregister; 1342 1343 goto out; 1344 1345 handler_unregister: 1346 batadv_recv_handler_unregister(BATADV_IV_OGM); 1347 out: 1348 return ret; 1349 } 1350