1 /* Copyright (C) 2007-2014 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, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include "main.h" 19 #include "translation-table.h" 20 #include "originator.h" 21 #include "routing.h" 22 #include "gateway_common.h" 23 #include "gateway_client.h" 24 #include "hard-interface.h" 25 #include "send.h" 26 #include "bat_algo.h" 27 #include "network-coding.h" 28 29 30 /** 31 * batadv_dup_status - duplicate status 32 * @BATADV_NO_DUP: the packet is a duplicate 33 * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the 34 * neighbor) 35 * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor 36 * @BATADV_PROTECTED: originator is currently protected (after reboot) 37 */ 38 enum batadv_dup_status { 39 BATADV_NO_DUP = 0, 40 BATADV_ORIG_DUP, 41 BATADV_NEIGH_DUP, 42 BATADV_PROTECTED, 43 }; 44 45 /** 46 * batadv_ring_buffer_set - update the ring buffer with the given value 47 * @lq_recv: pointer to the ring buffer 48 * @lq_index: index to store the value at 49 * @value: value to store in the ring buffer 50 */ 51 static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, 52 uint8_t value) 53 { 54 lq_recv[*lq_index] = value; 55 *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; 56 } 57 58 /** 59 * batadv_ring_buffer_set - compute the average of all non-zero values stored 60 * in the given ring buffer 61 * @lq_recv: pointer to the ring buffer 62 * 63 * Returns computed average value. 64 */ 65 static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]) 66 { 67 const uint8_t *ptr; 68 uint16_t count = 0, i = 0, sum = 0; 69 70 ptr = lq_recv; 71 72 while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { 73 if (*ptr != 0) { 74 count++; 75 sum += *ptr; 76 } 77 78 i++; 79 ptr++; 80 } 81 82 if (count == 0) 83 return 0; 84 85 return (uint8_t)(sum / count); 86 } 87 88 /** 89 * batadv_iv_ogm_orig_free - free the private resources allocated for this 90 * orig_node 91 * @orig_node: the orig_node for which the resources have to be free'd 92 */ 93 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node) 94 { 95 kfree(orig_node->bat_iv.bcast_own); 96 kfree(orig_node->bat_iv.bcast_own_sum); 97 } 98 99 /** 100 * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to 101 * include the new hard-interface 102 * @orig_node: the orig_node that has to be changed 103 * @max_if_num: the current amount of interfaces 104 * 105 * Returns 0 on success, a negative error code otherwise. 106 */ 107 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, 108 int max_if_num) 109 { 110 void *data_ptr; 111 size_t data_size, old_size; 112 int ret = -ENOMEM; 113 114 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 115 116 data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS; 117 old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; 118 data_ptr = kmalloc(data_size, GFP_ATOMIC); 119 if (!data_ptr) 120 goto unlock; 121 122 memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size); 123 kfree(orig_node->bat_iv.bcast_own); 124 orig_node->bat_iv.bcast_own = data_ptr; 125 126 data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); 127 if (!data_ptr) { 128 kfree(orig_node->bat_iv.bcast_own); 129 goto unlock; 130 } 131 132 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, 133 (max_if_num - 1) * sizeof(uint8_t)); 134 kfree(orig_node->bat_iv.bcast_own_sum); 135 orig_node->bat_iv.bcast_own_sum = data_ptr; 136 137 ret = 0; 138 139 unlock: 140 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 141 142 return ret; 143 } 144 145 /** 146 * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to 147 * exclude the removed interface 148 * @orig_node: the orig_node that has to be changed 149 * @max_if_num: the current amount of interfaces 150 * @del_if_num: the index of the interface being removed 151 * 152 * Returns 0 on success, a negative error code otherwise. 153 */ 154 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, 155 int max_if_num, int del_if_num) 156 { 157 int chunk_size, ret = -ENOMEM, if_offset; 158 void *data_ptr = NULL; 159 160 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 161 162 /* last interface was removed */ 163 if (max_if_num == 0) 164 goto free_bcast_own; 165 166 chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; 167 data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC); 168 if (!data_ptr) 169 goto unlock; 170 171 /* copy first part */ 172 memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); 173 174 /* copy second part */ 175 memcpy((char *)data_ptr + del_if_num * chunk_size, 176 orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size), 177 (max_if_num - del_if_num) * chunk_size); 178 179 free_bcast_own: 180 kfree(orig_node->bat_iv.bcast_own); 181 orig_node->bat_iv.bcast_own = data_ptr; 182 183 if (max_if_num == 0) 184 goto free_own_sum; 185 186 data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC); 187 if (!data_ptr) { 188 kfree(orig_node->bat_iv.bcast_own); 189 goto unlock; 190 } 191 192 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, 193 del_if_num * sizeof(uint8_t)); 194 195 if_offset = (del_if_num + 1) * sizeof(uint8_t); 196 memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t), 197 orig_node->bat_iv.bcast_own_sum + if_offset, 198 (max_if_num - del_if_num) * sizeof(uint8_t)); 199 200 free_own_sum: 201 kfree(orig_node->bat_iv.bcast_own_sum); 202 orig_node->bat_iv.bcast_own_sum = data_ptr; 203 204 ret = 0; 205 unlock: 206 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 207 208 return ret; 209 } 210 211 /** 212 * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator 213 * @bat_priv: the bat priv with all the soft interface information 214 * @addr: mac address of the originator 215 * 216 * Returns the originator object corresponding to the passed mac address or NULL 217 * on failure. 218 * If the object does not exists it is created an initialised. 219 */ 220 static struct batadv_orig_node * 221 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr) 222 { 223 struct batadv_orig_node *orig_node; 224 int size, hash_added; 225 226 orig_node = batadv_orig_hash_find(bat_priv, addr); 227 if (orig_node) 228 return orig_node; 229 230 orig_node = batadv_orig_node_new(bat_priv, addr); 231 if (!orig_node) 232 return NULL; 233 234 spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock); 235 236 size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; 237 orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC); 238 if (!orig_node->bat_iv.bcast_own) 239 goto free_orig_node; 240 241 size = bat_priv->num_ifaces * sizeof(uint8_t); 242 orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC); 243 if (!orig_node->bat_iv.bcast_own_sum) 244 goto free_orig_node; 245 246 hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, 247 batadv_choose_orig, orig_node, 248 &orig_node->hash_entry); 249 if (hash_added != 0) 250 goto free_orig_node; 251 252 return orig_node; 253 254 free_orig_node: 255 /* free twice, as batadv_orig_node_new sets refcount to 2 */ 256 batadv_orig_node_free_ref(orig_node); 257 batadv_orig_node_free_ref(orig_node); 258 259 return NULL; 260 } 261 262 static struct batadv_neigh_node * 263 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, 264 const uint8_t *neigh_addr, 265 struct batadv_orig_node *orig_node, 266 struct batadv_orig_node *orig_neigh) 267 { 268 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 269 struct batadv_neigh_node *neigh_node, *tmp_neigh_node; 270 271 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node); 272 if (!neigh_node) 273 goto out; 274 275 if (!atomic_inc_not_zero(&hard_iface->refcount)) { 276 kfree(neigh_node); 277 neigh_node = NULL; 278 goto out; 279 } 280 281 neigh_node->orig_node = orig_neigh; 282 neigh_node->if_incoming = hard_iface; 283 284 spin_lock_bh(&orig_node->neigh_list_lock); 285 tmp_neigh_node = batadv_neigh_node_get(orig_node, hard_iface, 286 neigh_addr); 287 if (!tmp_neigh_node) { 288 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); 289 } else { 290 kfree(neigh_node); 291 batadv_hardif_free_ref(hard_iface); 292 neigh_node = tmp_neigh_node; 293 } 294 spin_unlock_bh(&orig_node->neigh_list_lock); 295 296 if (!tmp_neigh_node) 297 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 298 "Creating new neighbor %pM for orig_node %pM on interface %s\n", 299 neigh_addr, orig_node->orig, 300 hard_iface->net_dev->name); 301 302 out: 303 return neigh_node; 304 } 305 306 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) 307 { 308 struct batadv_ogm_packet *batadv_ogm_packet; 309 unsigned char *ogm_buff; 310 uint32_t random_seqno; 311 int res = -ENOMEM; 312 313 /* randomize initial seqno to avoid collision */ 314 get_random_bytes(&random_seqno, sizeof(random_seqno)); 315 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); 316 317 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; 318 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); 319 if (!ogm_buff) 320 goto out; 321 322 hard_iface->bat_iv.ogm_buff = ogm_buff; 323 324 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 325 batadv_ogm_packet->packet_type = BATADV_IV_OGM; 326 batadv_ogm_packet->version = BATADV_COMPAT_VERSION; 327 batadv_ogm_packet->ttl = 2; 328 batadv_ogm_packet->flags = BATADV_NO_FLAGS; 329 batadv_ogm_packet->reserved = 0; 330 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; 331 332 res = 0; 333 334 out: 335 return res; 336 } 337 338 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) 339 { 340 kfree(hard_iface->bat_iv.ogm_buff); 341 hard_iface->bat_iv.ogm_buff = NULL; 342 } 343 344 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) 345 { 346 struct batadv_ogm_packet *batadv_ogm_packet; 347 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; 348 349 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 350 ether_addr_copy(batadv_ogm_packet->orig, 351 hard_iface->net_dev->dev_addr); 352 ether_addr_copy(batadv_ogm_packet->prev_sender, 353 hard_iface->net_dev->dev_addr); 354 } 355 356 static void 357 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) 358 { 359 struct batadv_ogm_packet *batadv_ogm_packet; 360 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; 361 362 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 363 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; 364 batadv_ogm_packet->ttl = BATADV_TTL; 365 } 366 367 /* when do we schedule our own ogm to be sent */ 368 static unsigned long 369 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) 370 { 371 unsigned int msecs; 372 373 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; 374 msecs += prandom_u32() % (2 * BATADV_JITTER); 375 376 return jiffies + msecs_to_jiffies(msecs); 377 } 378 379 /* when do we schedule a ogm packet to be sent */ 380 static unsigned long batadv_iv_ogm_fwd_send_time(void) 381 { 382 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); 383 } 384 385 /* apply hop penalty for a normal link */ 386 static uint8_t batadv_hop_penalty(uint8_t tq, 387 const struct batadv_priv *bat_priv) 388 { 389 int hop_penalty = atomic_read(&bat_priv->hop_penalty); 390 int new_tq; 391 392 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); 393 new_tq /= BATADV_TQ_MAX_VALUE; 394 395 return new_tq; 396 } 397 398 /* is there another aggregated packet here? */ 399 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, 400 __be16 tvlv_len) 401 { 402 int next_buff_pos = 0; 403 404 next_buff_pos += buff_pos + BATADV_OGM_HLEN; 405 next_buff_pos += ntohs(tvlv_len); 406 407 return (next_buff_pos <= packet_len) && 408 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); 409 } 410 411 /* send a batman ogm to a given interface */ 412 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, 413 struct batadv_hard_iface *hard_iface) 414 { 415 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 416 char *fwd_str; 417 uint8_t packet_num; 418 int16_t buff_pos; 419 struct batadv_ogm_packet *batadv_ogm_packet; 420 struct sk_buff *skb; 421 uint8_t *packet_pos; 422 423 if (hard_iface->if_status != BATADV_IF_ACTIVE) 424 return; 425 426 packet_num = 0; 427 buff_pos = 0; 428 packet_pos = forw_packet->skb->data; 429 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 430 431 /* adjust all flags and log packets */ 432 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, 433 batadv_ogm_packet->tvlv_len)) { 434 /* we might have aggregated direct link packets with an 435 * ordinary base packet 436 */ 437 if (forw_packet->direct_link_flags & BIT(packet_num) && 438 forw_packet->if_incoming == hard_iface) 439 batadv_ogm_packet->flags |= BATADV_DIRECTLINK; 440 else 441 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; 442 443 if (packet_num > 0 || !forw_packet->own) 444 fwd_str = "Forwarding"; 445 else 446 fwd_str = "Sending own"; 447 448 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 449 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n", 450 fwd_str, (packet_num > 0 ? "aggregated " : ""), 451 batadv_ogm_packet->orig, 452 ntohl(batadv_ogm_packet->seqno), 453 batadv_ogm_packet->tq, batadv_ogm_packet->ttl, 454 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 455 "on" : "off"), 456 hard_iface->net_dev->name, 457 hard_iface->net_dev->dev_addr); 458 459 buff_pos += BATADV_OGM_HLEN; 460 buff_pos += ntohs(batadv_ogm_packet->tvlv_len); 461 packet_num++; 462 packet_pos = forw_packet->skb->data + buff_pos; 463 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 464 } 465 466 /* create clone because function is called more than once */ 467 skb = skb_clone(forw_packet->skb, GFP_ATOMIC); 468 if (skb) { 469 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); 470 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, 471 skb->len + ETH_HLEN); 472 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); 473 } 474 } 475 476 /* send a batman ogm packet */ 477 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) 478 { 479 struct net_device *soft_iface; 480 struct batadv_priv *bat_priv; 481 struct batadv_hard_iface *primary_if = NULL; 482 483 if (!forw_packet->if_incoming) { 484 pr_err("Error - can't forward packet: incoming iface not specified\n"); 485 goto out; 486 } 487 488 soft_iface = forw_packet->if_incoming->soft_iface; 489 bat_priv = netdev_priv(soft_iface); 490 491 if (WARN_ON(!forw_packet->if_outgoing)) 492 goto out; 493 494 if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface)) 495 goto out; 496 497 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) 498 goto out; 499 500 primary_if = batadv_primary_if_get_selected(bat_priv); 501 if (!primary_if) 502 goto out; 503 504 /* only for one specific outgoing interface */ 505 batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing); 506 507 out: 508 if (primary_if) 509 batadv_hardif_free_ref(primary_if); 510 } 511 512 /** 513 * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an 514 * existing forward packet 515 * @new_bat_ogm_packet: OGM packet to be aggregated 516 * @bat_priv: the bat priv with all the soft interface information 517 * @packet_len: (total) length of the OGM 518 * @send_time: timestamp (jiffies) when the packet is to be sent 519 * @direktlink: true if this is a direct link packet 520 * @if_incoming: interface where the packet was received 521 * @if_outgoing: interface for which the retransmission should be considered 522 * @forw_packet: the forwarded packet which should be checked 523 * 524 * Returns true if new_packet can be aggregated with forw_packet 525 */ 526 static bool 527 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, 528 struct batadv_priv *bat_priv, 529 int packet_len, unsigned long send_time, 530 bool directlink, 531 const struct batadv_hard_iface *if_incoming, 532 const struct batadv_hard_iface *if_outgoing, 533 const struct batadv_forw_packet *forw_packet) 534 { 535 struct batadv_ogm_packet *batadv_ogm_packet; 536 int aggregated_bytes = forw_packet->packet_len + packet_len; 537 struct batadv_hard_iface *primary_if = NULL; 538 bool res = false; 539 unsigned long aggregation_end_time; 540 541 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; 542 aggregation_end_time = send_time; 543 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); 544 545 /* we can aggregate the current packet to this aggregated packet 546 * if: 547 * 548 * - the send time is within our MAX_AGGREGATION_MS time 549 * - the resulting packet wont be bigger than 550 * MAX_AGGREGATION_BYTES 551 */ 552 if (time_before(send_time, forw_packet->send_time) && 553 time_after_eq(aggregation_end_time, forw_packet->send_time) && 554 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) { 555 /* check aggregation compatibility 556 * -> direct link packets are broadcasted on 557 * their interface only 558 * -> aggregate packet if the current packet is 559 * a "global" packet as well as the base 560 * packet 561 */ 562 primary_if = batadv_primary_if_get_selected(bat_priv); 563 if (!primary_if) 564 goto out; 565 566 /* packet is not leaving on the same interface. */ 567 if (forw_packet->if_outgoing != if_outgoing) 568 goto out; 569 570 /* packets without direct link flag and high TTL 571 * are flooded through the net 572 */ 573 if ((!directlink) && 574 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) && 575 (batadv_ogm_packet->ttl != 1) && 576 577 /* own packets originating non-primary 578 * interfaces leave only that interface 579 */ 580 ((!forw_packet->own) || 581 (forw_packet->if_incoming == primary_if))) { 582 res = true; 583 goto out; 584 } 585 586 /* if the incoming packet is sent via this one 587 * interface only - we still can aggregate 588 */ 589 if ((directlink) && 590 (new_bat_ogm_packet->ttl == 1) && 591 (forw_packet->if_incoming == if_incoming) && 592 593 /* packets from direct neighbors or 594 * own secondary interface packets 595 * (= secondary interface packets in general) 596 */ 597 (batadv_ogm_packet->flags & BATADV_DIRECTLINK || 598 (forw_packet->own && 599 forw_packet->if_incoming != primary_if))) { 600 res = true; 601 goto out; 602 } 603 } 604 605 out: 606 if (primary_if) 607 batadv_hardif_free_ref(primary_if); 608 return res; 609 } 610 611 /** 612 * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this 613 * packet to it. 614 * @packet_buff: pointer to the OGM 615 * @packet_len: (total) length of the OGM 616 * @send_time: timestamp (jiffies) when the packet is to be sent 617 * @direct_link: whether this OGM has direct link status 618 * @if_incoming: interface where the packet was received 619 * @if_outgoing: interface for which the retransmission should be considered 620 * @own_packet: true if it is a self-generated ogm 621 */ 622 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, 623 int packet_len, unsigned long send_time, 624 bool direct_link, 625 struct batadv_hard_iface *if_incoming, 626 struct batadv_hard_iface *if_outgoing, 627 int own_packet) 628 { 629 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 630 struct batadv_forw_packet *forw_packet_aggr; 631 unsigned char *skb_buff; 632 unsigned int skb_size; 633 634 if (!atomic_inc_not_zero(&if_incoming->refcount)) 635 return; 636 637 if (!atomic_inc_not_zero(&if_outgoing->refcount)) 638 goto out_free_incoming; 639 640 /* own packet should always be scheduled */ 641 if (!own_packet) { 642 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { 643 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 644 "batman packet queue full\n"); 645 goto out; 646 } 647 } 648 649 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); 650 if (!forw_packet_aggr) { 651 if (!own_packet) 652 atomic_inc(&bat_priv->batman_queue_left); 653 goto out; 654 } 655 656 if ((atomic_read(&bat_priv->aggregated_ogms)) && 657 (packet_len < BATADV_MAX_AGGREGATION_BYTES)) 658 skb_size = BATADV_MAX_AGGREGATION_BYTES; 659 else 660 skb_size = packet_len; 661 662 skb_size += ETH_HLEN; 663 664 forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size); 665 if (!forw_packet_aggr->skb) { 666 if (!own_packet) 667 atomic_inc(&bat_priv->batman_queue_left); 668 kfree(forw_packet_aggr); 669 goto out; 670 } 671 forw_packet_aggr->skb->priority = TC_PRIO_CONTROL; 672 skb_reserve(forw_packet_aggr->skb, ETH_HLEN); 673 674 skb_buff = skb_put(forw_packet_aggr->skb, packet_len); 675 forw_packet_aggr->packet_len = packet_len; 676 memcpy(skb_buff, packet_buff, packet_len); 677 678 forw_packet_aggr->own = own_packet; 679 forw_packet_aggr->if_incoming = if_incoming; 680 forw_packet_aggr->if_outgoing = if_outgoing; 681 forw_packet_aggr->num_packets = 0; 682 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; 683 forw_packet_aggr->send_time = send_time; 684 685 /* save packet direct link flag status */ 686 if (direct_link) 687 forw_packet_aggr->direct_link_flags |= 1; 688 689 /* add new packet to packet list */ 690 spin_lock_bh(&bat_priv->forw_bat_list_lock); 691 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); 692 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 693 694 /* start timer for this packet */ 695 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, 696 batadv_send_outstanding_bat_ogm_packet); 697 queue_delayed_work(batadv_event_workqueue, 698 &forw_packet_aggr->delayed_work, 699 send_time - jiffies); 700 701 return; 702 out: 703 batadv_hardif_free_ref(if_outgoing); 704 out_free_incoming: 705 batadv_hardif_free_ref(if_incoming); 706 } 707 708 /* aggregate a new packet into the existing ogm packet */ 709 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, 710 const unsigned char *packet_buff, 711 int packet_len, bool direct_link) 712 { 713 unsigned char *skb_buff; 714 unsigned long new_direct_link_flag; 715 716 skb_buff = skb_put(forw_packet_aggr->skb, packet_len); 717 memcpy(skb_buff, packet_buff, packet_len); 718 forw_packet_aggr->packet_len += packet_len; 719 forw_packet_aggr->num_packets++; 720 721 /* save packet direct link flag status */ 722 if (direct_link) { 723 new_direct_link_flag = BIT(forw_packet_aggr->num_packets); 724 forw_packet_aggr->direct_link_flags |= new_direct_link_flag; 725 } 726 } 727 728 /** 729 * batadv_iv_ogm_queue_add - queue up an OGM for transmission 730 * @bat_priv: the bat priv with all the soft interface information 731 * @packet_buff: pointer to the OGM 732 * @packet_len: (total) length of the OGM 733 * @if_incoming: interface where the packet was received 734 * @if_outgoing: interface for which the retransmission should be considered 735 * @own_packet: true if it is a self-generated ogm 736 * @send_time: timestamp (jiffies) when the packet is to be sent 737 */ 738 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, 739 unsigned char *packet_buff, 740 int packet_len, 741 struct batadv_hard_iface *if_incoming, 742 struct batadv_hard_iface *if_outgoing, 743 int own_packet, unsigned long send_time) 744 { 745 /* _aggr -> pointer to the packet we want to aggregate with 746 * _pos -> pointer to the position in the queue 747 */ 748 struct batadv_forw_packet *forw_packet_aggr = NULL; 749 struct batadv_forw_packet *forw_packet_pos = NULL; 750 struct batadv_ogm_packet *batadv_ogm_packet; 751 bool direct_link; 752 unsigned long max_aggregation_jiffies; 753 754 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; 755 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0; 756 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); 757 758 /* find position for the packet in the forward queue */ 759 spin_lock_bh(&bat_priv->forw_bat_list_lock); 760 /* own packets are not to be aggregated */ 761 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { 762 hlist_for_each_entry(forw_packet_pos, 763 &bat_priv->forw_bat_list, list) { 764 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, 765 bat_priv, packet_len, 766 send_time, direct_link, 767 if_incoming, 768 if_outgoing, 769 forw_packet_pos)) { 770 forw_packet_aggr = forw_packet_pos; 771 break; 772 } 773 } 774 } 775 776 /* nothing to aggregate with - either aggregation disabled or no 777 * suitable aggregation packet found 778 */ 779 if (!forw_packet_aggr) { 780 /* the following section can run without the lock */ 781 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 782 783 /* if we could not aggregate this packet with one of the others 784 * we hold it back for a while, so that it might be aggregated 785 * later on 786 */ 787 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) 788 send_time += max_aggregation_jiffies; 789 790 batadv_iv_ogm_aggregate_new(packet_buff, packet_len, 791 send_time, direct_link, 792 if_incoming, if_outgoing, 793 own_packet); 794 } else { 795 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, 796 packet_len, direct_link); 797 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 798 } 799 } 800 801 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, 802 const struct ethhdr *ethhdr, 803 struct batadv_ogm_packet *batadv_ogm_packet, 804 bool is_single_hop_neigh, 805 bool is_from_best_next_hop, 806 struct batadv_hard_iface *if_incoming, 807 struct batadv_hard_iface *if_outgoing) 808 { 809 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 810 uint16_t tvlv_len; 811 812 if (batadv_ogm_packet->ttl <= 1) { 813 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); 814 return; 815 } 816 817 if (!is_from_best_next_hop) { 818 /* Mark the forwarded packet when it is not coming from our 819 * best next hop. We still need to forward the packet for our 820 * neighbor link quality detection to work in case the packet 821 * originated from a single hop neighbor. Otherwise we can 822 * simply drop the ogm. 823 */ 824 if (is_single_hop_neigh) 825 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; 826 else 827 return; 828 } 829 830 tvlv_len = ntohs(batadv_ogm_packet->tvlv_len); 831 832 batadv_ogm_packet->ttl--; 833 ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source); 834 835 /* apply hop penalty */ 836 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, 837 bat_priv); 838 839 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 840 "Forwarding packet: tq: %i, ttl: %i\n", 841 batadv_ogm_packet->tq, batadv_ogm_packet->ttl); 842 843 /* switch of primaries first hop flag when forwarding */ 844 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; 845 if (is_single_hop_neigh) 846 batadv_ogm_packet->flags |= BATADV_DIRECTLINK; 847 else 848 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; 849 850 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, 851 BATADV_OGM_HLEN + tvlv_len, 852 if_incoming, if_outgoing, 0, 853 batadv_iv_ogm_fwd_send_time()); 854 } 855 856 /** 857 * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for 858 * the given interface 859 * @hard_iface: the interface for which the windows have to be shifted 860 */ 861 static void 862 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) 863 { 864 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 865 struct batadv_hashtable *hash = bat_priv->orig_hash; 866 struct hlist_head *head; 867 struct batadv_orig_node *orig_node; 868 unsigned long *word; 869 uint32_t i; 870 size_t word_index; 871 uint8_t *w; 872 int if_num; 873 874 for (i = 0; i < hash->size; i++) { 875 head = &hash->table[i]; 876 877 rcu_read_lock(); 878 hlist_for_each_entry_rcu(orig_node, head, hash_entry) { 879 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 880 word_index = hard_iface->if_num * BATADV_NUM_WORDS; 881 word = &(orig_node->bat_iv.bcast_own[word_index]); 882 883 batadv_bit_get_packet(bat_priv, word, 1, 0); 884 if_num = hard_iface->if_num; 885 w = &orig_node->bat_iv.bcast_own_sum[if_num]; 886 *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); 887 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 888 } 889 rcu_read_unlock(); 890 } 891 } 892 893 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) 894 { 895 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 896 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; 897 struct batadv_ogm_packet *batadv_ogm_packet; 898 struct batadv_hard_iface *primary_if, *tmp_hard_iface; 899 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; 900 uint32_t seqno; 901 uint16_t tvlv_len = 0; 902 unsigned long send_time; 903 904 primary_if = batadv_primary_if_get_selected(bat_priv); 905 906 if (hard_iface == primary_if) { 907 /* tt changes have to be committed before the tvlv data is 908 * appended as it may alter the tt tvlv container 909 */ 910 batadv_tt_local_commit_changes(bat_priv); 911 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff, 912 ogm_buff_len, 913 BATADV_OGM_HLEN); 914 } 915 916 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); 917 batadv_ogm_packet->tvlv_len = htons(tvlv_len); 918 919 /* change sequence number to network order */ 920 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno); 921 batadv_ogm_packet->seqno = htonl(seqno); 922 atomic_inc(&hard_iface->bat_iv.ogm_seqno); 923 924 batadv_iv_ogm_slide_own_bcast_window(hard_iface); 925 926 send_time = batadv_iv_ogm_emit_send_time(bat_priv); 927 928 if (hard_iface != primary_if) { 929 /* OGMs from secondary interfaces are only scheduled on their 930 * respective interfaces. 931 */ 932 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len, 933 hard_iface, hard_iface, 1, send_time); 934 goto out; 935 } 936 937 /* OGMs from primary interfaces are scheduled on all 938 * interfaces. 939 */ 940 rcu_read_lock(); 941 list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) { 942 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface) 943 continue; 944 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, 945 *ogm_buff_len, hard_iface, 946 tmp_hard_iface, 1, send_time); 947 } 948 rcu_read_unlock(); 949 950 out: 951 if (primary_if) 952 batadv_hardif_free_ref(primary_if); 953 } 954 955 /** 956 * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an 957 * originator 958 * @bat_priv: the bat priv with all the soft interface information 959 * @orig_node: the orig node who originally emitted the ogm packet 960 * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node 961 * @ethhdr: Ethernet header of the OGM 962 * @batadv_ogm_packet: the ogm packet 963 * @if_incoming: interface where the packet was received 964 * @if_outgoing: interface for which the retransmission should be considered 965 * @dup_status: the duplicate status of this ogm packet. 966 */ 967 static void 968 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, 969 struct batadv_orig_node *orig_node, 970 struct batadv_orig_ifinfo *orig_ifinfo, 971 const struct ethhdr *ethhdr, 972 const struct batadv_ogm_packet *batadv_ogm_packet, 973 struct batadv_hard_iface *if_incoming, 974 struct batadv_hard_iface *if_outgoing, 975 enum batadv_dup_status dup_status) 976 { 977 struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; 978 struct batadv_neigh_ifinfo *router_ifinfo = NULL; 979 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; 980 struct batadv_neigh_node *router = NULL; 981 struct batadv_orig_node *orig_node_tmp; 982 int if_num; 983 uint8_t sum_orig, sum_neigh; 984 uint8_t *neigh_addr; 985 uint8_t tq_avg; 986 987 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 988 "update_originator(): Searching and updating originator entry of received packet\n"); 989 990 rcu_read_lock(); 991 hlist_for_each_entry_rcu(tmp_neigh_node, 992 &orig_node->neigh_list, list) { 993 neigh_addr = tmp_neigh_node->addr; 994 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && 995 tmp_neigh_node->if_incoming == if_incoming && 996 atomic_inc_not_zero(&tmp_neigh_node->refcount)) { 997 if (WARN(neigh_node, "too many matching neigh_nodes")) 998 batadv_neigh_node_free_ref(neigh_node); 999 neigh_node = tmp_neigh_node; 1000 continue; 1001 } 1002 1003 if (dup_status != BATADV_NO_DUP) 1004 continue; 1005 1006 /* only update the entry for this outgoing interface */ 1007 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node, 1008 if_outgoing); 1009 if (!neigh_ifinfo) 1010 continue; 1011 1012 spin_lock_bh(&tmp_neigh_node->ifinfo_lock); 1013 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, 1014 &neigh_ifinfo->bat_iv.tq_index, 0); 1015 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); 1016 neigh_ifinfo->bat_iv.tq_avg = tq_avg; 1017 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock); 1018 1019 batadv_neigh_ifinfo_free_ref(neigh_ifinfo); 1020 neigh_ifinfo = NULL; 1021 } 1022 1023 if (!neigh_node) { 1024 struct batadv_orig_node *orig_tmp; 1025 1026 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); 1027 if (!orig_tmp) 1028 goto unlock; 1029 1030 neigh_node = batadv_iv_ogm_neigh_new(if_incoming, 1031 ethhdr->h_source, 1032 orig_node, orig_tmp); 1033 1034 batadv_orig_node_free_ref(orig_tmp); 1035 if (!neigh_node) 1036 goto unlock; 1037 } else 1038 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1039 "Updating existing last-hop neighbor of originator\n"); 1040 1041 rcu_read_unlock(); 1042 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); 1043 if (!neigh_ifinfo) 1044 goto out; 1045 1046 neigh_node->last_seen = jiffies; 1047 1048 spin_lock_bh(&neigh_node->ifinfo_lock); 1049 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, 1050 &neigh_ifinfo->bat_iv.tq_index, 1051 batadv_ogm_packet->tq); 1052 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); 1053 neigh_ifinfo->bat_iv.tq_avg = tq_avg; 1054 spin_unlock_bh(&neigh_node->ifinfo_lock); 1055 1056 if (dup_status == BATADV_NO_DUP) { 1057 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl; 1058 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl; 1059 } 1060 1061 /* if this neighbor already is our next hop there is nothing 1062 * to change 1063 */ 1064 router = batadv_orig_router_get(orig_node, if_outgoing); 1065 if (router == neigh_node) 1066 goto out; 1067 1068 if (router) { 1069 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); 1070 if (!router_ifinfo) 1071 goto out; 1072 1073 /* if this neighbor does not offer a better TQ we won't 1074 * consider it 1075 */ 1076 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg) 1077 goto out; 1078 } 1079 1080 /* if the TQ is the same and the link not more symmetric we 1081 * won't consider it either 1082 */ 1083 if (router_ifinfo && 1084 (neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg)) { 1085 orig_node_tmp = router->orig_node; 1086 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1087 if_num = router->if_incoming->if_num; 1088 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; 1089 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1090 1091 orig_node_tmp = neigh_node->orig_node; 1092 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1093 if_num = neigh_node->if_incoming->if_num; 1094 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; 1095 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1096 1097 if (sum_orig >= sum_neigh) 1098 goto out; 1099 } 1100 1101 batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); 1102 goto out; 1103 1104 unlock: 1105 rcu_read_unlock(); 1106 out: 1107 if (neigh_node) 1108 batadv_neigh_node_free_ref(neigh_node); 1109 if (router) 1110 batadv_neigh_node_free_ref(router); 1111 if (neigh_ifinfo) 1112 batadv_neigh_ifinfo_free_ref(neigh_ifinfo); 1113 if (router_ifinfo) 1114 batadv_neigh_ifinfo_free_ref(router_ifinfo); 1115 } 1116 1117 /** 1118 * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet 1119 * @orig_node: the orig node who originally emitted the ogm packet 1120 * @orig_neigh_node: the orig node struct of the neighbor who sent the packet 1121 * @batadv_ogm_packet: the ogm packet 1122 * @if_incoming: interface where the packet was received 1123 * @if_outgoing: interface for which the retransmission should be considered 1124 * 1125 * Returns 1 if the link can be considered bidirectional, 0 otherwise 1126 */ 1127 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, 1128 struct batadv_orig_node *orig_neigh_node, 1129 struct batadv_ogm_packet *batadv_ogm_packet, 1130 struct batadv_hard_iface *if_incoming, 1131 struct batadv_hard_iface *if_outgoing) 1132 { 1133 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1134 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; 1135 struct batadv_neigh_ifinfo *neigh_ifinfo; 1136 uint8_t total_count; 1137 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; 1138 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; 1139 int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0; 1140 unsigned int combined_tq; 1141 int tq_iface_penalty; 1142 1143 /* find corresponding one hop neighbor */ 1144 rcu_read_lock(); 1145 hlist_for_each_entry_rcu(tmp_neigh_node, 1146 &orig_neigh_node->neigh_list, list) { 1147 if (!batadv_compare_eth(tmp_neigh_node->addr, 1148 orig_neigh_node->orig)) 1149 continue; 1150 1151 if (tmp_neigh_node->if_incoming != if_incoming) 1152 continue; 1153 1154 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) 1155 continue; 1156 1157 neigh_node = tmp_neigh_node; 1158 break; 1159 } 1160 rcu_read_unlock(); 1161 1162 if (!neigh_node) 1163 neigh_node = batadv_iv_ogm_neigh_new(if_incoming, 1164 orig_neigh_node->orig, 1165 orig_neigh_node, 1166 orig_neigh_node); 1167 1168 if (!neigh_node) 1169 goto out; 1170 1171 /* if orig_node is direct neighbor update neigh_node last_seen */ 1172 if (orig_node == orig_neigh_node) 1173 neigh_node->last_seen = jiffies; 1174 1175 orig_node->last_seen = jiffies; 1176 1177 /* find packet count of corresponding one hop neighbor */ 1178 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1179 if_num = if_incoming->if_num; 1180 orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num]; 1181 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); 1182 if (neigh_ifinfo) { 1183 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count; 1184 batadv_neigh_ifinfo_free_ref(neigh_ifinfo); 1185 } else { 1186 neigh_rq_count = 0; 1187 } 1188 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1189 1190 /* pay attention to not get a value bigger than 100 % */ 1191 if (orig_eq_count > neigh_rq_count) 1192 total_count = neigh_rq_count; 1193 else 1194 total_count = orig_eq_count; 1195 1196 /* if we have too few packets (too less data) we set tq_own to zero 1197 * if we receive too few packets it is not considered bidirectional 1198 */ 1199 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || 1200 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) 1201 tq_own = 0; 1202 else 1203 /* neigh_node->real_packet_count is never zero as we 1204 * only purge old information when getting new 1205 * information 1206 */ 1207 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; 1208 1209 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does 1210 * affect the nearly-symmetric links only a little, but 1211 * punishes asymmetric links more. This will give a value 1212 * between 0 and TQ_MAX_VALUE 1213 */ 1214 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; 1215 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; 1216 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * 1217 BATADV_TQ_LOCAL_WINDOW_SIZE * 1218 BATADV_TQ_LOCAL_WINDOW_SIZE; 1219 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; 1220 inv_asym_penalty /= neigh_rq_max_cube; 1221 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; 1222 1223 /* penalize if the OGM is forwarded on the same interface. WiFi 1224 * interfaces and other half duplex devices suffer from throughput 1225 * drops as they can't send and receive at the same time. 1226 */ 1227 tq_iface_penalty = BATADV_TQ_MAX_VALUE; 1228 if (if_outgoing && (if_incoming == if_outgoing) && 1229 batadv_is_wifi_netdev(if_outgoing->net_dev)) 1230 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE, 1231 bat_priv); 1232 1233 combined_tq = batadv_ogm_packet->tq * 1234 tq_own * 1235 tq_asym_penalty * 1236 tq_iface_penalty; 1237 combined_tq /= BATADV_TQ_MAX_VALUE * 1238 BATADV_TQ_MAX_VALUE * 1239 BATADV_TQ_MAX_VALUE; 1240 batadv_ogm_packet->tq = combined_tq; 1241 1242 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1243 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n", 1244 orig_node->orig, orig_neigh_node->orig, total_count, 1245 neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty, 1246 batadv_ogm_packet->tq, if_incoming->net_dev->name, 1247 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT"); 1248 1249 /* if link has the minimum required transmission quality 1250 * consider it bidirectional 1251 */ 1252 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) 1253 ret = 1; 1254 1255 out: 1256 if (neigh_node) 1257 batadv_neigh_node_free_ref(neigh_node); 1258 return ret; 1259 } 1260 1261 /** 1262 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces, 1263 * adjust the sequence number and find out whether it is a duplicate 1264 * @ethhdr: ethernet header of the packet 1265 * @batadv_ogm_packet: OGM packet to be considered 1266 * @if_incoming: interface on which the OGM packet was received 1267 * @if_outgoing: interface for which the retransmission should be considered 1268 * 1269 * Returns duplicate status as enum batadv_dup_status 1270 */ 1271 static enum batadv_dup_status 1272 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, 1273 const struct batadv_ogm_packet *batadv_ogm_packet, 1274 const struct batadv_hard_iface *if_incoming, 1275 struct batadv_hard_iface *if_outgoing) 1276 { 1277 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1278 struct batadv_orig_node *orig_node; 1279 struct batadv_orig_ifinfo *orig_ifinfo = NULL; 1280 struct batadv_neigh_node *neigh_node; 1281 struct batadv_neigh_ifinfo *neigh_ifinfo; 1282 int is_dup; 1283 int32_t seq_diff; 1284 int need_update = 0; 1285 int set_mark; 1286 enum batadv_dup_status ret = BATADV_NO_DUP; 1287 uint32_t seqno = ntohl(batadv_ogm_packet->seqno); 1288 uint8_t *neigh_addr; 1289 uint8_t packet_count; 1290 unsigned long *bitmap; 1291 1292 orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); 1293 if (!orig_node) 1294 return BATADV_NO_DUP; 1295 1296 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); 1297 if (WARN_ON(!orig_ifinfo)) { 1298 batadv_orig_node_free_ref(orig_node); 1299 return 0; 1300 } 1301 1302 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1303 seq_diff = seqno - orig_ifinfo->last_real_seqno; 1304 1305 /* signalize caller that the packet is to be dropped. */ 1306 if (!hlist_empty(&orig_node->neigh_list) && 1307 batadv_window_protected(bat_priv, seq_diff, 1308 &orig_ifinfo->batman_seqno_reset)) { 1309 ret = BATADV_PROTECTED; 1310 goto out; 1311 } 1312 1313 rcu_read_lock(); 1314 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { 1315 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, 1316 if_outgoing); 1317 if (!neigh_ifinfo) 1318 continue; 1319 1320 neigh_addr = neigh_node->addr; 1321 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits, 1322 orig_ifinfo->last_real_seqno, 1323 seqno); 1324 1325 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && 1326 neigh_node->if_incoming == if_incoming) { 1327 set_mark = 1; 1328 if (is_dup) 1329 ret = BATADV_NEIGH_DUP; 1330 } else { 1331 set_mark = 0; 1332 if (is_dup && (ret != BATADV_NEIGH_DUP)) 1333 ret = BATADV_ORIG_DUP; 1334 } 1335 1336 /* if the window moved, set the update flag. */ 1337 bitmap = neigh_ifinfo->bat_iv.real_bits; 1338 need_update |= batadv_bit_get_packet(bat_priv, bitmap, 1339 seq_diff, set_mark); 1340 1341 packet_count = bitmap_weight(bitmap, 1342 BATADV_TQ_LOCAL_WINDOW_SIZE); 1343 neigh_ifinfo->bat_iv.real_packet_count = packet_count; 1344 batadv_neigh_ifinfo_free_ref(neigh_ifinfo); 1345 } 1346 rcu_read_unlock(); 1347 1348 if (need_update) { 1349 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1350 "%s updating last_seqno: old %u, new %u\n", 1351 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT", 1352 orig_ifinfo->last_real_seqno, seqno); 1353 orig_ifinfo->last_real_seqno = seqno; 1354 } 1355 1356 out: 1357 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1358 batadv_orig_node_free_ref(orig_node); 1359 if (orig_ifinfo) 1360 batadv_orig_ifinfo_free_ref(orig_ifinfo); 1361 return ret; 1362 } 1363 1364 1365 /** 1366 * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if 1367 * @skb: the skb containing the OGM 1368 * @orig_node: the (cached) orig node for the originator of this OGM 1369 * @if_incoming: the interface where this packet was received 1370 * @if_outgoing: the interface for which the packet should be considered 1371 */ 1372 static void 1373 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, 1374 struct batadv_orig_node *orig_node, 1375 struct batadv_hard_iface *if_incoming, 1376 struct batadv_hard_iface *if_outgoing) 1377 { 1378 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1379 struct batadv_neigh_node *router = NULL, *router_router = NULL; 1380 struct batadv_orig_node *orig_neigh_node; 1381 struct batadv_orig_ifinfo *orig_ifinfo; 1382 struct batadv_neigh_node *orig_neigh_router = NULL; 1383 struct batadv_neigh_ifinfo *router_ifinfo = NULL; 1384 struct batadv_ogm_packet *ogm_packet; 1385 enum batadv_dup_status dup_status; 1386 bool is_from_best_next_hop = false; 1387 bool is_single_hop_neigh = false; 1388 bool sameseq, similar_ttl; 1389 struct sk_buff *skb_priv; 1390 struct ethhdr *ethhdr; 1391 uint8_t *prev_sender; 1392 int is_bidirect; 1393 1394 /* create a private copy of the skb, as some functions change tq value 1395 * and/or flags. 1396 */ 1397 skb_priv = skb_copy(skb, GFP_ATOMIC); 1398 if (!skb_priv) 1399 return; 1400 1401 ethhdr = eth_hdr(skb_priv); 1402 ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset); 1403 1404 dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet, 1405 if_incoming, if_outgoing); 1406 if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig)) 1407 is_single_hop_neigh = true; 1408 1409 if (dup_status == BATADV_PROTECTED) { 1410 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1411 "Drop packet: packet within seqno protection time (sender: %pM)\n", 1412 ethhdr->h_source); 1413 goto out; 1414 } 1415 1416 if (ogm_packet->tq == 0) { 1417 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1418 "Drop packet: originator packet with tq equal 0\n"); 1419 goto out; 1420 } 1421 1422 router = batadv_orig_router_get(orig_node, if_outgoing); 1423 if (router) { 1424 router_router = batadv_orig_router_get(router->orig_node, 1425 if_outgoing); 1426 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); 1427 } 1428 1429 if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) && 1430 (batadv_compare_eth(router->addr, ethhdr->h_source))) 1431 is_from_best_next_hop = true; 1432 1433 prev_sender = ogm_packet->prev_sender; 1434 /* avoid temporary routing loops */ 1435 if (router && router_router && 1436 (batadv_compare_eth(router->addr, prev_sender)) && 1437 !(batadv_compare_eth(ogm_packet->orig, prev_sender)) && 1438 (batadv_compare_eth(router->addr, router_router->addr))) { 1439 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1440 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", 1441 ethhdr->h_source); 1442 goto out; 1443 } 1444 1445 if (if_outgoing == BATADV_IF_DEFAULT) 1446 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node); 1447 1448 /* if sender is a direct neighbor the sender mac equals 1449 * originator mac 1450 */ 1451 if (is_single_hop_neigh) 1452 orig_neigh_node = orig_node; 1453 else 1454 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, 1455 ethhdr->h_source); 1456 1457 if (!orig_neigh_node) 1458 goto out; 1459 1460 /* Update nc_nodes of the originator */ 1461 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, 1462 ogm_packet, is_single_hop_neigh); 1463 1464 orig_neigh_router = batadv_orig_router_get(orig_neigh_node, 1465 if_outgoing); 1466 1467 /* drop packet if sender is not a direct neighbor and if we 1468 * don't route towards it 1469 */ 1470 if (!is_single_hop_neigh && (!orig_neigh_router)) { 1471 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1472 "Drop packet: OGM via unknown neighbor!\n"); 1473 goto out_neigh; 1474 } 1475 1476 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, 1477 ogm_packet, if_incoming, 1478 if_outgoing); 1479 1480 /* update ranking if it is not a duplicate or has the same 1481 * seqno and similar ttl as the non-duplicate 1482 */ 1483 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); 1484 if (!orig_ifinfo) 1485 goto out_neigh; 1486 1487 sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno); 1488 similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl; 1489 1490 if (is_bidirect && ((dup_status == BATADV_NO_DUP) || 1491 (sameseq && similar_ttl))) { 1492 batadv_iv_ogm_orig_update(bat_priv, orig_node, 1493 orig_ifinfo, ethhdr, 1494 ogm_packet, if_incoming, 1495 if_outgoing, dup_status); 1496 } 1497 batadv_orig_ifinfo_free_ref(orig_ifinfo); 1498 1499 /* only forward for specific interface, not for the default one. */ 1500 if (if_outgoing == BATADV_IF_DEFAULT) 1501 goto out_neigh; 1502 1503 /* is single hop (direct) neighbor */ 1504 if (is_single_hop_neigh) { 1505 /* OGMs from secondary interfaces should only scheduled once 1506 * per interface where it has been received, not multiple times 1507 */ 1508 if ((ogm_packet->ttl <= 2) && 1509 (if_incoming != if_outgoing)) { 1510 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1511 "Drop packet: OGM from secondary interface and wrong outgoing interface\n"); 1512 goto out_neigh; 1513 } 1514 /* mark direct link on incoming interface */ 1515 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, 1516 is_single_hop_neigh, 1517 is_from_best_next_hop, if_incoming, 1518 if_outgoing); 1519 1520 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1521 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); 1522 goto out_neigh; 1523 } 1524 1525 /* multihop originator */ 1526 if (!is_bidirect) { 1527 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1528 "Drop packet: not received via bidirectional link\n"); 1529 goto out_neigh; 1530 } 1531 1532 if (dup_status == BATADV_NEIGH_DUP) { 1533 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1534 "Drop packet: duplicate packet received\n"); 1535 goto out_neigh; 1536 } 1537 1538 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1539 "Forwarding packet: rebroadcast originator packet\n"); 1540 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, 1541 is_single_hop_neigh, is_from_best_next_hop, 1542 if_incoming, if_outgoing); 1543 1544 out_neigh: 1545 if ((orig_neigh_node) && (!is_single_hop_neigh)) 1546 batadv_orig_node_free_ref(orig_neigh_node); 1547 out: 1548 if (router_ifinfo) 1549 batadv_neigh_ifinfo_free_ref(router_ifinfo); 1550 if (router) 1551 batadv_neigh_node_free_ref(router); 1552 if (router_router) 1553 batadv_neigh_node_free_ref(router_router); 1554 if (orig_neigh_router) 1555 batadv_neigh_node_free_ref(orig_neigh_router); 1556 1557 kfree_skb(skb_priv); 1558 } 1559 1560 /** 1561 * batadv_iv_ogm_process - process an incoming batman iv OGM 1562 * @skb: the skb containing the OGM 1563 * @ogm_offset: offset to the OGM which should be processed (for aggregates) 1564 * @if_incoming: the interface where this packet was receved 1565 */ 1566 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, 1567 struct batadv_hard_iface *if_incoming) 1568 { 1569 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1570 struct batadv_orig_node *orig_neigh_node, *orig_node; 1571 struct batadv_hard_iface *hard_iface; 1572 struct batadv_ogm_packet *ogm_packet; 1573 uint32_t if_incoming_seqno; 1574 bool has_directlink_flag; 1575 struct ethhdr *ethhdr; 1576 bool is_my_oldorig = false; 1577 bool is_my_addr = false; 1578 bool is_my_orig = false; 1579 1580 ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset); 1581 ethhdr = eth_hdr(skb); 1582 1583 /* Silently drop when the batman packet is actually not a 1584 * correct packet. 1585 * 1586 * This might happen if a packet is padded (e.g. Ethernet has a 1587 * minimum frame length of 64 byte) and the aggregation interprets 1588 * it as an additional length. 1589 * 1590 * TODO: A more sane solution would be to have a bit in the 1591 * batadv_ogm_packet to detect whether the packet is the last 1592 * packet in an aggregation. Here we expect that the padding 1593 * is always zero (or not 0x01) 1594 */ 1595 if (ogm_packet->packet_type != BATADV_IV_OGM) 1596 return; 1597 1598 /* could be changed by schedule_own_packet() */ 1599 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); 1600 1601 if (ogm_packet->flags & BATADV_DIRECTLINK) 1602 has_directlink_flag = true; 1603 else 1604 has_directlink_flag = false; 1605 1606 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1607 "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, tq %d, TTL %d, V %d, IDF %d)\n", 1608 ethhdr->h_source, if_incoming->net_dev->name, 1609 if_incoming->net_dev->dev_addr, ogm_packet->orig, 1610 ogm_packet->prev_sender, ntohl(ogm_packet->seqno), 1611 ogm_packet->tq, ogm_packet->ttl, 1612 ogm_packet->version, has_directlink_flag); 1613 1614 rcu_read_lock(); 1615 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 1616 if (hard_iface->if_status != BATADV_IF_ACTIVE) 1617 continue; 1618 1619 if (hard_iface->soft_iface != if_incoming->soft_iface) 1620 continue; 1621 1622 if (batadv_compare_eth(ethhdr->h_source, 1623 hard_iface->net_dev->dev_addr)) 1624 is_my_addr = true; 1625 1626 if (batadv_compare_eth(ogm_packet->orig, 1627 hard_iface->net_dev->dev_addr)) 1628 is_my_orig = true; 1629 1630 if (batadv_compare_eth(ogm_packet->prev_sender, 1631 hard_iface->net_dev->dev_addr)) 1632 is_my_oldorig = true; 1633 } 1634 rcu_read_unlock(); 1635 1636 if (is_my_addr) { 1637 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1638 "Drop packet: received my own broadcast (sender: %pM)\n", 1639 ethhdr->h_source); 1640 return; 1641 } 1642 1643 if (is_my_orig) { 1644 unsigned long *word; 1645 int offset; 1646 int32_t bit_pos; 1647 int16_t if_num; 1648 uint8_t *weight; 1649 1650 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, 1651 ethhdr->h_source); 1652 if (!orig_neigh_node) 1653 return; 1654 1655 /* neighbor has to indicate direct link and it has to 1656 * come via the corresponding interface 1657 * save packet seqno for bidirectional check 1658 */ 1659 if (has_directlink_flag && 1660 batadv_compare_eth(if_incoming->net_dev->dev_addr, 1661 ogm_packet->orig)) { 1662 if_num = if_incoming->if_num; 1663 offset = if_num * BATADV_NUM_WORDS; 1664 1665 spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); 1666 word = &(orig_neigh_node->bat_iv.bcast_own[offset]); 1667 bit_pos = if_incoming_seqno - 2; 1668 bit_pos -= ntohl(ogm_packet->seqno); 1669 batadv_set_bit(word, bit_pos); 1670 weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num]; 1671 *weight = bitmap_weight(word, 1672 BATADV_TQ_LOCAL_WINDOW_SIZE); 1673 spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); 1674 } 1675 1676 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1677 "Drop packet: originator packet from myself (via neighbor)\n"); 1678 batadv_orig_node_free_ref(orig_neigh_node); 1679 return; 1680 } 1681 1682 if (is_my_oldorig) { 1683 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1684 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", 1685 ethhdr->h_source); 1686 return; 1687 } 1688 1689 if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { 1690 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1691 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", 1692 ethhdr->h_source); 1693 return; 1694 } 1695 1696 orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig); 1697 if (!orig_node) 1698 return; 1699 1700 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, 1701 if_incoming, BATADV_IF_DEFAULT); 1702 1703 rcu_read_lock(); 1704 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 1705 if (hard_iface->if_status != BATADV_IF_ACTIVE) 1706 continue; 1707 1708 if (hard_iface->soft_iface != bat_priv->soft_iface) 1709 continue; 1710 1711 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, 1712 if_incoming, hard_iface); 1713 } 1714 rcu_read_unlock(); 1715 1716 batadv_orig_node_free_ref(orig_node); 1717 } 1718 1719 static int batadv_iv_ogm_receive(struct sk_buff *skb, 1720 struct batadv_hard_iface *if_incoming) 1721 { 1722 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1723 struct batadv_ogm_packet *ogm_packet; 1724 uint8_t *packet_pos; 1725 int ogm_offset; 1726 bool ret; 1727 1728 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); 1729 if (!ret) 1730 return NET_RX_DROP; 1731 1732 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface 1733 * that does not have B.A.T.M.A.N. IV enabled ? 1734 */ 1735 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) 1736 return NET_RX_DROP; 1737 1738 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); 1739 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, 1740 skb->len + ETH_HLEN); 1741 1742 ogm_offset = 0; 1743 ogm_packet = (struct batadv_ogm_packet *)skb->data; 1744 1745 /* unpack the aggregated packets and process them one by one */ 1746 while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb), 1747 ogm_packet->tvlv_len)) { 1748 batadv_iv_ogm_process(skb, ogm_offset, if_incoming); 1749 1750 ogm_offset += BATADV_OGM_HLEN; 1751 ogm_offset += ntohs(ogm_packet->tvlv_len); 1752 1753 packet_pos = skb->data + ogm_offset; 1754 ogm_packet = (struct batadv_ogm_packet *)packet_pos; 1755 } 1756 1757 kfree_skb(skb); 1758 return NET_RX_SUCCESS; 1759 } 1760 1761 /** 1762 * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table 1763 * @orig_node: the orig_node for which the neighbors are printed 1764 * @if_outgoing: outgoing interface for these entries 1765 * @seq: debugfs table seq_file struct 1766 * 1767 * Must be called while holding an rcu lock. 1768 */ 1769 static void 1770 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node, 1771 struct batadv_hard_iface *if_outgoing, 1772 struct seq_file *seq) 1773 { 1774 struct batadv_neigh_node *neigh_node; 1775 struct batadv_neigh_ifinfo *n_ifinfo; 1776 1777 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { 1778 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); 1779 if (!n_ifinfo) 1780 continue; 1781 1782 seq_printf(seq, " %pM (%3i)", 1783 neigh_node->addr, 1784 n_ifinfo->bat_iv.tq_avg); 1785 1786 batadv_neigh_ifinfo_free_ref(n_ifinfo); 1787 } 1788 } 1789 1790 /** 1791 * batadv_iv_ogm_orig_print - print the originator table 1792 * @bat_priv: the bat priv with all the soft interface information 1793 * @seq: debugfs table seq_file struct 1794 * @if_outgoing: the outgoing interface for which this should be printed 1795 */ 1796 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, 1797 struct seq_file *seq, 1798 struct batadv_hard_iface *if_outgoing) 1799 { 1800 struct batadv_neigh_node *neigh_node; 1801 struct batadv_hashtable *hash = bat_priv->orig_hash; 1802 int last_seen_msecs, last_seen_secs; 1803 struct batadv_orig_node *orig_node; 1804 struct batadv_neigh_ifinfo *n_ifinfo; 1805 unsigned long last_seen_jiffies; 1806 struct hlist_head *head; 1807 int batman_count = 0; 1808 uint32_t i; 1809 1810 seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n", 1811 "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE, 1812 "Nexthop", "outgoingIF", "Potential nexthops"); 1813 1814 for (i = 0; i < hash->size; i++) { 1815 head = &hash->table[i]; 1816 1817 rcu_read_lock(); 1818 hlist_for_each_entry_rcu(orig_node, head, hash_entry) { 1819 neigh_node = batadv_orig_router_get(orig_node, 1820 if_outgoing); 1821 if (!neigh_node) 1822 continue; 1823 1824 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, 1825 if_outgoing); 1826 if (!n_ifinfo) 1827 goto next; 1828 1829 if (n_ifinfo->bat_iv.tq_avg == 0) 1830 goto next; 1831 1832 last_seen_jiffies = jiffies - orig_node->last_seen; 1833 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); 1834 last_seen_secs = last_seen_msecs / 1000; 1835 last_seen_msecs = last_seen_msecs % 1000; 1836 1837 seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", 1838 orig_node->orig, last_seen_secs, 1839 last_seen_msecs, n_ifinfo->bat_iv.tq_avg, 1840 neigh_node->addr, 1841 neigh_node->if_incoming->net_dev->name); 1842 1843 batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing, 1844 seq); 1845 seq_puts(seq, "\n"); 1846 batman_count++; 1847 1848 next: 1849 batadv_neigh_node_free_ref(neigh_node); 1850 if (n_ifinfo) 1851 batadv_neigh_ifinfo_free_ref(n_ifinfo); 1852 } 1853 rcu_read_unlock(); 1854 } 1855 1856 if (batman_count == 0) 1857 seq_puts(seq, "No batman nodes in range ...\n"); 1858 } 1859 1860 /** 1861 * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors 1862 * @neigh1: the first neighbor object of the comparison 1863 * @if_outgoing1: outgoing interface for the first neighbor 1864 * @neigh2: the second neighbor object of the comparison 1865 * @if_outgoing2: outgoing interface for the second neighbor 1866 * 1867 * Returns a value less, equal to or greater than 0 if the metric via neigh1 is 1868 * lower, the same as or higher than the metric via neigh2 1869 */ 1870 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, 1871 struct batadv_hard_iface *if_outgoing1, 1872 struct batadv_neigh_node *neigh2, 1873 struct batadv_hard_iface *if_outgoing2) 1874 { 1875 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; 1876 uint8_t tq1, tq2; 1877 int diff; 1878 1879 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); 1880 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); 1881 1882 if (!neigh1_ifinfo || !neigh2_ifinfo) { 1883 diff = 0; 1884 goto out; 1885 } 1886 1887 tq1 = neigh1_ifinfo->bat_iv.tq_avg; 1888 tq2 = neigh2_ifinfo->bat_iv.tq_avg; 1889 diff = tq1 - tq2; 1890 1891 out: 1892 if (neigh1_ifinfo) 1893 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo); 1894 if (neigh2_ifinfo) 1895 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo); 1896 1897 return diff; 1898 } 1899 1900 /** 1901 * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than 1902 * neigh2 from the metric prospective 1903 * @neigh1: the first neighbor object of the comparison 1904 * @if_outgoing: outgoing interface for the first neighbor 1905 * @neigh2: the second neighbor object of the comparison 1906 * @if_outgoing2: outgoing interface for the second neighbor 1907 1908 * Returns true if the metric via neigh1 is equally good or better than 1909 * the metric via neigh2, false otherwise. 1910 */ 1911 static bool 1912 batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1, 1913 struct batadv_hard_iface *if_outgoing1, 1914 struct batadv_neigh_node *neigh2, 1915 struct batadv_hard_iface *if_outgoing2) 1916 { 1917 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; 1918 uint8_t tq1, tq2; 1919 bool ret; 1920 1921 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); 1922 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); 1923 1924 /* we can't say that the metric is better */ 1925 if (!neigh1_ifinfo || !neigh2_ifinfo) { 1926 ret = false; 1927 goto out; 1928 } 1929 1930 tq1 = neigh1_ifinfo->bat_iv.tq_avg; 1931 tq2 = neigh2_ifinfo->bat_iv.tq_avg; 1932 ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD; 1933 1934 out: 1935 if (neigh1_ifinfo) 1936 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo); 1937 if (neigh2_ifinfo) 1938 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo); 1939 1940 return ret; 1941 } 1942 1943 static struct batadv_algo_ops batadv_batman_iv __read_mostly = { 1944 .name = "BATMAN_IV", 1945 .bat_iface_enable = batadv_iv_ogm_iface_enable, 1946 .bat_iface_disable = batadv_iv_ogm_iface_disable, 1947 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, 1948 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, 1949 .bat_ogm_schedule = batadv_iv_ogm_schedule, 1950 .bat_ogm_emit = batadv_iv_ogm_emit, 1951 .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp, 1952 .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob, 1953 .bat_orig_print = batadv_iv_ogm_orig_print, 1954 .bat_orig_free = batadv_iv_ogm_orig_free, 1955 .bat_orig_add_if = batadv_iv_ogm_orig_add_if, 1956 .bat_orig_del_if = batadv_iv_ogm_orig_del_if, 1957 }; 1958 1959 int __init batadv_iv_init(void) 1960 { 1961 int ret; 1962 1963 /* batman originator packet */ 1964 ret = batadv_recv_handler_register(BATADV_IV_OGM, 1965 batadv_iv_ogm_receive); 1966 if (ret < 0) 1967 goto out; 1968 1969 ret = batadv_algo_register(&batadv_batman_iv); 1970 if (ret < 0) 1971 goto handler_unregister; 1972 1973 goto out; 1974 1975 handler_unregister: 1976 batadv_recv_handler_unregister(BATADV_IV_OGM); 1977 out: 1978 return ret; 1979 } 1980