1 /* Copyright (C) 2007-2015 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 "bat_algo.h" 19 #include "main.h" 20 21 #include <linux/atomic.h> 22 #include <linux/bitmap.h> 23 #include <linux/bitops.h> 24 #include <linux/bug.h> 25 #include <linux/byteorder/generic.h> 26 #include <linux/cache.h> 27 #include <linux/errno.h> 28 #include <linux/etherdevice.h> 29 #include <linux/fs.h> 30 #include <linux/if_ether.h> 31 #include <linux/init.h> 32 #include <linux/jiffies.h> 33 #include <linux/list.h> 34 #include <linux/netdevice.h> 35 #include <linux/pkt_sched.h> 36 #include <linux/printk.h> 37 #include <linux/random.h> 38 #include <linux/rculist.h> 39 #include <linux/rcupdate.h> 40 #include <linux/seq_file.h> 41 #include <linux/skbuff.h> 42 #include <linux/slab.h> 43 #include <linux/spinlock.h> 44 #include <linux/stddef.h> 45 #include <linux/string.h> 46 #include <linux/types.h> 47 #include <linux/workqueue.h> 48 49 #include "bitarray.h" 50 #include "hard-interface.h" 51 #include "hash.h" 52 #include "network-coding.h" 53 #include "originator.h" 54 #include "packet.h" 55 #include "routing.h" 56 #include "send.h" 57 #include "translation-table.h" 58 59 /** 60 * enum batadv_dup_status - duplicate status 61 * @BATADV_NO_DUP: the packet is no duplicate 62 * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the 63 * neighbor) 64 * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor 65 * @BATADV_PROTECTED: originator is currently protected (after reboot) 66 */ 67 enum batadv_dup_status { 68 BATADV_NO_DUP = 0, 69 BATADV_ORIG_DUP, 70 BATADV_NEIGH_DUP, 71 BATADV_PROTECTED, 72 }; 73 74 /** 75 * batadv_ring_buffer_set - update the ring buffer with the given value 76 * @lq_recv: pointer to the ring buffer 77 * @lq_index: index to store the value at 78 * @value: value to store in the ring buffer 79 */ 80 static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index, 81 uint8_t value) 82 { 83 lq_recv[*lq_index] = value; 84 *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; 85 } 86 87 /** 88 * batadv_ring_buffer_avg - compute the average of all non-zero values stored 89 * in the given ring buffer 90 * @lq_recv: pointer to the ring buffer 91 * 92 * Returns computed average value. 93 */ 94 static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[]) 95 { 96 const uint8_t *ptr; 97 uint16_t count = 0; 98 uint16_t i = 0; 99 uint16_t sum = 0; 100 101 ptr = lq_recv; 102 103 while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { 104 if (*ptr != 0) { 105 count++; 106 sum += *ptr; 107 } 108 109 i++; 110 ptr++; 111 } 112 113 if (count == 0) 114 return 0; 115 116 return (uint8_t)(sum / count); 117 } 118 119 /** 120 * batadv_iv_ogm_orig_free - free the private resources allocated for this 121 * orig_node 122 * @orig_node: the orig_node for which the resources have to be free'd 123 */ 124 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node) 125 { 126 kfree(orig_node->bat_iv.bcast_own); 127 kfree(orig_node->bat_iv.bcast_own_sum); 128 } 129 130 /** 131 * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to 132 * include the new hard-interface 133 * @orig_node: the orig_node that has to be changed 134 * @max_if_num: the current amount of interfaces 135 * 136 * Returns 0 on success, a negative error code otherwise. 137 */ 138 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, 139 int max_if_num) 140 { 141 void *data_ptr; 142 size_t old_size; 143 int ret = -ENOMEM; 144 145 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 146 147 old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; 148 data_ptr = kmalloc_array(max_if_num, 149 BATADV_NUM_WORDS * sizeof(unsigned long), 150 GFP_ATOMIC); 151 if (!data_ptr) 152 goto unlock; 153 154 memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size); 155 kfree(orig_node->bat_iv.bcast_own); 156 orig_node->bat_iv.bcast_own = data_ptr; 157 158 data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC); 159 if (!data_ptr) { 160 kfree(orig_node->bat_iv.bcast_own); 161 goto unlock; 162 } 163 164 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, 165 (max_if_num - 1) * sizeof(uint8_t)); 166 kfree(orig_node->bat_iv.bcast_own_sum); 167 orig_node->bat_iv.bcast_own_sum = data_ptr; 168 169 ret = 0; 170 171 unlock: 172 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 173 174 return ret; 175 } 176 177 /** 178 * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to 179 * exclude the removed interface 180 * @orig_node: the orig_node that has to be changed 181 * @max_if_num: the current amount of interfaces 182 * @del_if_num: the index of the interface being removed 183 * 184 * Returns 0 on success, a negative error code otherwise. 185 */ 186 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, 187 int max_if_num, int del_if_num) 188 { 189 int chunk_size, ret = -ENOMEM, if_offset; 190 void *data_ptr = NULL; 191 192 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 193 194 /* last interface was removed */ 195 if (max_if_num == 0) 196 goto free_bcast_own; 197 198 chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; 199 data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC); 200 if (!data_ptr) 201 goto unlock; 202 203 /* copy first part */ 204 memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); 205 206 /* copy second part */ 207 memcpy((char *)data_ptr + del_if_num * chunk_size, 208 orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size), 209 (max_if_num - del_if_num) * chunk_size); 210 211 free_bcast_own: 212 kfree(orig_node->bat_iv.bcast_own); 213 orig_node->bat_iv.bcast_own = data_ptr; 214 215 if (max_if_num == 0) 216 goto free_own_sum; 217 218 data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC); 219 if (!data_ptr) { 220 kfree(orig_node->bat_iv.bcast_own); 221 goto unlock; 222 } 223 224 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, 225 del_if_num * sizeof(uint8_t)); 226 227 if_offset = (del_if_num + 1) * sizeof(uint8_t); 228 memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t), 229 orig_node->bat_iv.bcast_own_sum + if_offset, 230 (max_if_num - del_if_num) * sizeof(uint8_t)); 231 232 free_own_sum: 233 kfree(orig_node->bat_iv.bcast_own_sum); 234 orig_node->bat_iv.bcast_own_sum = data_ptr; 235 236 ret = 0; 237 unlock: 238 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 239 240 return ret; 241 } 242 243 /** 244 * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator 245 * @bat_priv: the bat priv with all the soft interface information 246 * @addr: mac address of the originator 247 * 248 * Returns the originator object corresponding to the passed mac address or NULL 249 * on failure. 250 * If the object does not exists it is created an initialised. 251 */ 252 static struct batadv_orig_node * 253 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr) 254 { 255 struct batadv_orig_node *orig_node; 256 int size, hash_added; 257 258 orig_node = batadv_orig_hash_find(bat_priv, addr); 259 if (orig_node) 260 return orig_node; 261 262 orig_node = batadv_orig_node_new(bat_priv, addr); 263 if (!orig_node) 264 return NULL; 265 266 spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock); 267 268 size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; 269 orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC); 270 if (!orig_node->bat_iv.bcast_own) 271 goto free_orig_node; 272 273 size = bat_priv->num_ifaces * sizeof(uint8_t); 274 orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC); 275 if (!orig_node->bat_iv.bcast_own_sum) 276 goto free_orig_node; 277 278 hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, 279 batadv_choose_orig, orig_node, 280 &orig_node->hash_entry); 281 if (hash_added != 0) 282 goto free_orig_node; 283 284 return orig_node; 285 286 free_orig_node: 287 /* free twice, as batadv_orig_node_new sets refcount to 2 */ 288 batadv_orig_node_free_ref(orig_node); 289 batadv_orig_node_free_ref(orig_node); 290 291 return NULL; 292 } 293 294 static struct batadv_neigh_node * 295 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, 296 const uint8_t *neigh_addr, 297 struct batadv_orig_node *orig_node, 298 struct batadv_orig_node *orig_neigh) 299 { 300 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 301 struct batadv_neigh_node *neigh_node, *tmp_neigh_node; 302 303 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node); 304 if (!neigh_node) 305 goto out; 306 307 if (!atomic_inc_not_zero(&hard_iface->refcount)) { 308 kfree(neigh_node); 309 neigh_node = NULL; 310 goto out; 311 } 312 313 neigh_node->orig_node = orig_neigh; 314 neigh_node->if_incoming = hard_iface; 315 316 spin_lock_bh(&orig_node->neigh_list_lock); 317 tmp_neigh_node = batadv_neigh_node_get(orig_node, hard_iface, 318 neigh_addr); 319 if (!tmp_neigh_node) { 320 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); 321 } else { 322 kfree(neigh_node); 323 batadv_hardif_free_ref(hard_iface); 324 neigh_node = tmp_neigh_node; 325 } 326 spin_unlock_bh(&orig_node->neigh_list_lock); 327 328 if (!tmp_neigh_node) 329 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 330 "Creating new neighbor %pM for orig_node %pM on interface %s\n", 331 neigh_addr, orig_node->orig, 332 hard_iface->net_dev->name); 333 334 out: 335 return neigh_node; 336 } 337 338 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) 339 { 340 struct batadv_ogm_packet *batadv_ogm_packet; 341 unsigned char *ogm_buff; 342 uint32_t random_seqno; 343 344 /* randomize initial seqno to avoid collision */ 345 get_random_bytes(&random_seqno, sizeof(random_seqno)); 346 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); 347 348 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; 349 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); 350 if (!ogm_buff) 351 return -ENOMEM; 352 353 hard_iface->bat_iv.ogm_buff = ogm_buff; 354 355 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 356 batadv_ogm_packet->packet_type = BATADV_IV_OGM; 357 batadv_ogm_packet->version = BATADV_COMPAT_VERSION; 358 batadv_ogm_packet->ttl = 2; 359 batadv_ogm_packet->flags = BATADV_NO_FLAGS; 360 batadv_ogm_packet->reserved = 0; 361 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; 362 363 return 0; 364 } 365 366 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) 367 { 368 kfree(hard_iface->bat_iv.ogm_buff); 369 hard_iface->bat_iv.ogm_buff = NULL; 370 } 371 372 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) 373 { 374 struct batadv_ogm_packet *batadv_ogm_packet; 375 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; 376 377 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 378 ether_addr_copy(batadv_ogm_packet->orig, 379 hard_iface->net_dev->dev_addr); 380 ether_addr_copy(batadv_ogm_packet->prev_sender, 381 hard_iface->net_dev->dev_addr); 382 } 383 384 static void 385 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) 386 { 387 struct batadv_ogm_packet *batadv_ogm_packet; 388 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; 389 390 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 391 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; 392 batadv_ogm_packet->ttl = BATADV_TTL; 393 } 394 395 /* when do we schedule our own ogm to be sent */ 396 static unsigned long 397 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) 398 { 399 unsigned int msecs; 400 401 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; 402 msecs += prandom_u32() % (2 * BATADV_JITTER); 403 404 return jiffies + msecs_to_jiffies(msecs); 405 } 406 407 /* when do we schedule a ogm packet to be sent */ 408 static unsigned long batadv_iv_ogm_fwd_send_time(void) 409 { 410 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); 411 } 412 413 /* apply hop penalty for a normal link */ 414 static uint8_t batadv_hop_penalty(uint8_t tq, 415 const struct batadv_priv *bat_priv) 416 { 417 int hop_penalty = atomic_read(&bat_priv->hop_penalty); 418 int new_tq; 419 420 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); 421 new_tq /= BATADV_TQ_MAX_VALUE; 422 423 return new_tq; 424 } 425 426 /* is there another aggregated packet here? */ 427 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, 428 __be16 tvlv_len) 429 { 430 int next_buff_pos = 0; 431 432 next_buff_pos += buff_pos + BATADV_OGM_HLEN; 433 next_buff_pos += ntohs(tvlv_len); 434 435 return (next_buff_pos <= packet_len) && 436 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); 437 } 438 439 /* send a batman ogm to a given interface */ 440 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, 441 struct batadv_hard_iface *hard_iface) 442 { 443 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 444 const char *fwd_str; 445 uint8_t packet_num; 446 int16_t buff_pos; 447 struct batadv_ogm_packet *batadv_ogm_packet; 448 struct sk_buff *skb; 449 uint8_t *packet_pos; 450 451 if (hard_iface->if_status != BATADV_IF_ACTIVE) 452 return; 453 454 packet_num = 0; 455 buff_pos = 0; 456 packet_pos = forw_packet->skb->data; 457 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 458 459 /* adjust all flags and log packets */ 460 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, 461 batadv_ogm_packet->tvlv_len)) { 462 /* we might have aggregated direct link packets with an 463 * ordinary base packet 464 */ 465 if (forw_packet->direct_link_flags & BIT(packet_num) && 466 forw_packet->if_incoming == hard_iface) 467 batadv_ogm_packet->flags |= BATADV_DIRECTLINK; 468 else 469 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; 470 471 if (packet_num > 0 || !forw_packet->own) 472 fwd_str = "Forwarding"; 473 else 474 fwd_str = "Sending own"; 475 476 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 477 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n", 478 fwd_str, (packet_num > 0 ? "aggregated " : ""), 479 batadv_ogm_packet->orig, 480 ntohl(batadv_ogm_packet->seqno), 481 batadv_ogm_packet->tq, batadv_ogm_packet->ttl, 482 ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ? 483 "on" : "off"), 484 hard_iface->net_dev->name, 485 hard_iface->net_dev->dev_addr); 486 487 buff_pos += BATADV_OGM_HLEN; 488 buff_pos += ntohs(batadv_ogm_packet->tvlv_len); 489 packet_num++; 490 packet_pos = forw_packet->skb->data + buff_pos; 491 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 492 } 493 494 /* create clone because function is called more than once */ 495 skb = skb_clone(forw_packet->skb, GFP_ATOMIC); 496 if (skb) { 497 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); 498 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, 499 skb->len + ETH_HLEN); 500 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); 501 } 502 } 503 504 /* send a batman ogm packet */ 505 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) 506 { 507 struct net_device *soft_iface; 508 struct batadv_priv *bat_priv; 509 struct batadv_hard_iface *primary_if = NULL; 510 511 if (!forw_packet->if_incoming) { 512 pr_err("Error - can't forward packet: incoming iface not specified\n"); 513 goto out; 514 } 515 516 soft_iface = forw_packet->if_incoming->soft_iface; 517 bat_priv = netdev_priv(soft_iface); 518 519 if (WARN_ON(!forw_packet->if_outgoing)) 520 goto out; 521 522 if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface)) 523 goto out; 524 525 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) 526 goto out; 527 528 primary_if = batadv_primary_if_get_selected(bat_priv); 529 if (!primary_if) 530 goto out; 531 532 /* only for one specific outgoing interface */ 533 batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing); 534 535 out: 536 if (primary_if) 537 batadv_hardif_free_ref(primary_if); 538 } 539 540 /** 541 * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an 542 * existing forward packet 543 * @new_bat_ogm_packet: OGM packet to be aggregated 544 * @bat_priv: the bat priv with all the soft interface information 545 * @packet_len: (total) length of the OGM 546 * @send_time: timestamp (jiffies) when the packet is to be sent 547 * @directlink: true if this is a direct link packet 548 * @if_incoming: interface where the packet was received 549 * @if_outgoing: interface for which the retransmission should be considered 550 * @forw_packet: the forwarded packet which should be checked 551 * 552 * Returns true if new_packet can be aggregated with forw_packet 553 */ 554 static bool 555 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, 556 struct batadv_priv *bat_priv, 557 int packet_len, unsigned long send_time, 558 bool directlink, 559 const struct batadv_hard_iface *if_incoming, 560 const struct batadv_hard_iface *if_outgoing, 561 const struct batadv_forw_packet *forw_packet) 562 { 563 struct batadv_ogm_packet *batadv_ogm_packet; 564 int aggregated_bytes = forw_packet->packet_len + packet_len; 565 struct batadv_hard_iface *primary_if = NULL; 566 bool res = false; 567 unsigned long aggregation_end_time; 568 569 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; 570 aggregation_end_time = send_time; 571 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); 572 573 /* we can aggregate the current packet to this aggregated packet 574 * if: 575 * 576 * - the send time is within our MAX_AGGREGATION_MS time 577 * - the resulting packet wont be bigger than 578 * MAX_AGGREGATION_BYTES 579 * otherwise aggregation is not possible 580 */ 581 if (!time_before(send_time, forw_packet->send_time) || 582 !time_after_eq(aggregation_end_time, forw_packet->send_time)) 583 return false; 584 585 if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES) 586 return false; 587 588 /* packet is not leaving on the same interface. */ 589 if (forw_packet->if_outgoing != if_outgoing) 590 return false; 591 592 /* check aggregation compatibility 593 * -> direct link packets are broadcasted on 594 * their interface only 595 * -> aggregate packet if the current packet is 596 * a "global" packet as well as the base 597 * packet 598 */ 599 primary_if = batadv_primary_if_get_selected(bat_priv); 600 if (!primary_if) 601 return false; 602 603 /* packets without direct link flag and high TTL 604 * are flooded through the net 605 */ 606 if (!directlink && 607 !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) && 608 batadv_ogm_packet->ttl != 1 && 609 610 /* own packets originating non-primary 611 * interfaces leave only that interface 612 */ 613 (!forw_packet->own || 614 forw_packet->if_incoming == primary_if)) { 615 res = true; 616 goto out; 617 } 618 619 /* if the incoming packet is sent via this one 620 * interface only - we still can aggregate 621 */ 622 if (directlink && 623 new_bat_ogm_packet->ttl == 1 && 624 forw_packet->if_incoming == if_incoming && 625 626 /* packets from direct neighbors or 627 * own secondary interface packets 628 * (= secondary interface packets in general) 629 */ 630 (batadv_ogm_packet->flags & BATADV_DIRECTLINK || 631 (forw_packet->own && 632 forw_packet->if_incoming != primary_if))) { 633 res = true; 634 goto out; 635 } 636 637 out: 638 if (primary_if) 639 batadv_hardif_free_ref(primary_if); 640 return res; 641 } 642 643 /** 644 * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this 645 * packet to it. 646 * @packet_buff: pointer to the OGM 647 * @packet_len: (total) length of the OGM 648 * @send_time: timestamp (jiffies) when the packet is to be sent 649 * @direct_link: whether this OGM has direct link status 650 * @if_incoming: interface where the packet was received 651 * @if_outgoing: interface for which the retransmission should be considered 652 * @own_packet: true if it is a self-generated ogm 653 */ 654 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, 655 int packet_len, unsigned long send_time, 656 bool direct_link, 657 struct batadv_hard_iface *if_incoming, 658 struct batadv_hard_iface *if_outgoing, 659 int own_packet) 660 { 661 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 662 struct batadv_forw_packet *forw_packet_aggr; 663 unsigned char *skb_buff; 664 unsigned int skb_size; 665 666 if (!atomic_inc_not_zero(&if_incoming->refcount)) 667 return; 668 669 if (!atomic_inc_not_zero(&if_outgoing->refcount)) 670 goto out_free_incoming; 671 672 /* own packet should always be scheduled */ 673 if (!own_packet) { 674 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { 675 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 676 "batman packet queue full\n"); 677 goto out_free_outgoing; 678 } 679 } 680 681 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); 682 if (!forw_packet_aggr) 683 goto out_nomem; 684 685 if (atomic_read(&bat_priv->aggregated_ogms) && 686 packet_len < BATADV_MAX_AGGREGATION_BYTES) 687 skb_size = BATADV_MAX_AGGREGATION_BYTES; 688 else 689 skb_size = packet_len; 690 691 skb_size += ETH_HLEN; 692 693 forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size); 694 if (!forw_packet_aggr->skb) 695 goto out_free_forw_packet; 696 forw_packet_aggr->skb->priority = TC_PRIO_CONTROL; 697 skb_reserve(forw_packet_aggr->skb, ETH_HLEN); 698 699 skb_buff = skb_put(forw_packet_aggr->skb, packet_len); 700 forw_packet_aggr->packet_len = packet_len; 701 memcpy(skb_buff, packet_buff, packet_len); 702 703 forw_packet_aggr->own = own_packet; 704 forw_packet_aggr->if_incoming = if_incoming; 705 forw_packet_aggr->if_outgoing = if_outgoing; 706 forw_packet_aggr->num_packets = 0; 707 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; 708 forw_packet_aggr->send_time = send_time; 709 710 /* save packet direct link flag status */ 711 if (direct_link) 712 forw_packet_aggr->direct_link_flags |= 1; 713 714 /* add new packet to packet list */ 715 spin_lock_bh(&bat_priv->forw_bat_list_lock); 716 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); 717 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 718 719 /* start timer for this packet */ 720 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, 721 batadv_send_outstanding_bat_ogm_packet); 722 queue_delayed_work(batadv_event_workqueue, 723 &forw_packet_aggr->delayed_work, 724 send_time - jiffies); 725 726 return; 727 out_free_forw_packet: 728 kfree(forw_packet_aggr); 729 out_nomem: 730 if (!own_packet) 731 atomic_inc(&bat_priv->batman_queue_left); 732 out_free_outgoing: 733 batadv_hardif_free_ref(if_outgoing); 734 out_free_incoming: 735 batadv_hardif_free_ref(if_incoming); 736 } 737 738 /* aggregate a new packet into the existing ogm packet */ 739 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, 740 const unsigned char *packet_buff, 741 int packet_len, bool direct_link) 742 { 743 unsigned char *skb_buff; 744 unsigned long new_direct_link_flag; 745 746 skb_buff = skb_put(forw_packet_aggr->skb, packet_len); 747 memcpy(skb_buff, packet_buff, packet_len); 748 forw_packet_aggr->packet_len += packet_len; 749 forw_packet_aggr->num_packets++; 750 751 /* save packet direct link flag status */ 752 if (direct_link) { 753 new_direct_link_flag = BIT(forw_packet_aggr->num_packets); 754 forw_packet_aggr->direct_link_flags |= new_direct_link_flag; 755 } 756 } 757 758 /** 759 * batadv_iv_ogm_queue_add - queue up an OGM for transmission 760 * @bat_priv: the bat priv with all the soft interface information 761 * @packet_buff: pointer to the OGM 762 * @packet_len: (total) length of the OGM 763 * @if_incoming: interface where the packet was received 764 * @if_outgoing: interface for which the retransmission should be considered 765 * @own_packet: true if it is a self-generated ogm 766 * @send_time: timestamp (jiffies) when the packet is to be sent 767 */ 768 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, 769 unsigned char *packet_buff, 770 int packet_len, 771 struct batadv_hard_iface *if_incoming, 772 struct batadv_hard_iface *if_outgoing, 773 int own_packet, unsigned long send_time) 774 { 775 /* _aggr -> pointer to the packet we want to aggregate with 776 * _pos -> pointer to the position in the queue 777 */ 778 struct batadv_forw_packet *forw_packet_aggr = NULL; 779 struct batadv_forw_packet *forw_packet_pos = NULL; 780 struct batadv_ogm_packet *batadv_ogm_packet; 781 bool direct_link; 782 unsigned long max_aggregation_jiffies; 783 784 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; 785 direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK); 786 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); 787 788 /* find position for the packet in the forward queue */ 789 spin_lock_bh(&bat_priv->forw_bat_list_lock); 790 /* own packets are not to be aggregated */ 791 if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) { 792 hlist_for_each_entry(forw_packet_pos, 793 &bat_priv->forw_bat_list, list) { 794 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, 795 bat_priv, packet_len, 796 send_time, direct_link, 797 if_incoming, 798 if_outgoing, 799 forw_packet_pos)) { 800 forw_packet_aggr = forw_packet_pos; 801 break; 802 } 803 } 804 } 805 806 /* nothing to aggregate with - either aggregation disabled or no 807 * suitable aggregation packet found 808 */ 809 if (!forw_packet_aggr) { 810 /* the following section can run without the lock */ 811 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 812 813 /* if we could not aggregate this packet with one of the others 814 * we hold it back for a while, so that it might be aggregated 815 * later on 816 */ 817 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) 818 send_time += max_aggregation_jiffies; 819 820 batadv_iv_ogm_aggregate_new(packet_buff, packet_len, 821 send_time, direct_link, 822 if_incoming, if_outgoing, 823 own_packet); 824 } else { 825 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, 826 packet_len, direct_link); 827 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 828 } 829 } 830 831 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, 832 const struct ethhdr *ethhdr, 833 struct batadv_ogm_packet *batadv_ogm_packet, 834 bool is_single_hop_neigh, 835 bool is_from_best_next_hop, 836 struct batadv_hard_iface *if_incoming, 837 struct batadv_hard_iface *if_outgoing) 838 { 839 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 840 uint16_t tvlv_len; 841 842 if (batadv_ogm_packet->ttl <= 1) { 843 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); 844 return; 845 } 846 847 if (!is_from_best_next_hop) { 848 /* Mark the forwarded packet when it is not coming from our 849 * best next hop. We still need to forward the packet for our 850 * neighbor link quality detection to work in case the packet 851 * originated from a single hop neighbor. Otherwise we can 852 * simply drop the ogm. 853 */ 854 if (is_single_hop_neigh) 855 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; 856 else 857 return; 858 } 859 860 tvlv_len = ntohs(batadv_ogm_packet->tvlv_len); 861 862 batadv_ogm_packet->ttl--; 863 ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source); 864 865 /* apply hop penalty */ 866 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, 867 bat_priv); 868 869 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 870 "Forwarding packet: tq: %i, ttl: %i\n", 871 batadv_ogm_packet->tq, batadv_ogm_packet->ttl); 872 873 /* switch of primaries first hop flag when forwarding */ 874 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; 875 if (is_single_hop_neigh) 876 batadv_ogm_packet->flags |= BATADV_DIRECTLINK; 877 else 878 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; 879 880 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, 881 BATADV_OGM_HLEN + tvlv_len, 882 if_incoming, if_outgoing, 0, 883 batadv_iv_ogm_fwd_send_time()); 884 } 885 886 /** 887 * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for 888 * the given interface 889 * @hard_iface: the interface for which the windows have to be shifted 890 */ 891 static void 892 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) 893 { 894 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 895 struct batadv_hashtable *hash = bat_priv->orig_hash; 896 struct hlist_head *head; 897 struct batadv_orig_node *orig_node; 898 unsigned long *word; 899 uint32_t i; 900 size_t word_index; 901 uint8_t *w; 902 int if_num; 903 904 for (i = 0; i < hash->size; i++) { 905 head = &hash->table[i]; 906 907 rcu_read_lock(); 908 hlist_for_each_entry_rcu(orig_node, head, hash_entry) { 909 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 910 word_index = hard_iface->if_num * BATADV_NUM_WORDS; 911 word = &orig_node->bat_iv.bcast_own[word_index]; 912 913 batadv_bit_get_packet(bat_priv, word, 1, 0); 914 if_num = hard_iface->if_num; 915 w = &orig_node->bat_iv.bcast_own_sum[if_num]; 916 *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); 917 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 918 } 919 rcu_read_unlock(); 920 } 921 } 922 923 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) 924 { 925 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 926 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; 927 struct batadv_ogm_packet *batadv_ogm_packet; 928 struct batadv_hard_iface *primary_if, *tmp_hard_iface; 929 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; 930 uint32_t seqno; 931 uint16_t tvlv_len = 0; 932 unsigned long send_time; 933 934 primary_if = batadv_primary_if_get_selected(bat_priv); 935 936 if (hard_iface == primary_if) { 937 /* tt changes have to be committed before the tvlv data is 938 * appended as it may alter the tt tvlv container 939 */ 940 batadv_tt_local_commit_changes(bat_priv); 941 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff, 942 ogm_buff_len, 943 BATADV_OGM_HLEN); 944 } 945 946 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); 947 batadv_ogm_packet->tvlv_len = htons(tvlv_len); 948 949 /* change sequence number to network order */ 950 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno); 951 batadv_ogm_packet->seqno = htonl(seqno); 952 atomic_inc(&hard_iface->bat_iv.ogm_seqno); 953 954 batadv_iv_ogm_slide_own_bcast_window(hard_iface); 955 956 send_time = batadv_iv_ogm_emit_send_time(bat_priv); 957 958 if (hard_iface != primary_if) { 959 /* OGMs from secondary interfaces are only scheduled on their 960 * respective interfaces. 961 */ 962 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len, 963 hard_iface, hard_iface, 1, send_time); 964 goto out; 965 } 966 967 /* OGMs from primary interfaces are scheduled on all 968 * interfaces. 969 */ 970 rcu_read_lock(); 971 list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) { 972 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface) 973 continue; 974 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, 975 *ogm_buff_len, hard_iface, 976 tmp_hard_iface, 1, send_time); 977 } 978 rcu_read_unlock(); 979 980 out: 981 if (primary_if) 982 batadv_hardif_free_ref(primary_if); 983 } 984 985 /** 986 * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an 987 * originator 988 * @bat_priv: the bat priv with all the soft interface information 989 * @orig_node: the orig node who originally emitted the ogm packet 990 * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node 991 * @ethhdr: Ethernet header of the OGM 992 * @batadv_ogm_packet: the ogm packet 993 * @if_incoming: interface where the packet was received 994 * @if_outgoing: interface for which the retransmission should be considered 995 * @dup_status: the duplicate status of this ogm packet. 996 */ 997 static void 998 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, 999 struct batadv_orig_node *orig_node, 1000 struct batadv_orig_ifinfo *orig_ifinfo, 1001 const struct ethhdr *ethhdr, 1002 const struct batadv_ogm_packet *batadv_ogm_packet, 1003 struct batadv_hard_iface *if_incoming, 1004 struct batadv_hard_iface *if_outgoing, 1005 enum batadv_dup_status dup_status) 1006 { 1007 struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; 1008 struct batadv_neigh_ifinfo *router_ifinfo = NULL; 1009 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; 1010 struct batadv_neigh_node *router = NULL; 1011 struct batadv_orig_node *orig_node_tmp; 1012 int if_num; 1013 uint8_t sum_orig, sum_neigh; 1014 uint8_t *neigh_addr; 1015 uint8_t tq_avg; 1016 1017 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1018 "update_originator(): Searching and updating originator entry of received packet\n"); 1019 1020 rcu_read_lock(); 1021 hlist_for_each_entry_rcu(tmp_neigh_node, 1022 &orig_node->neigh_list, list) { 1023 neigh_addr = tmp_neigh_node->addr; 1024 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && 1025 tmp_neigh_node->if_incoming == if_incoming && 1026 atomic_inc_not_zero(&tmp_neigh_node->refcount)) { 1027 if (WARN(neigh_node, "too many matching neigh_nodes")) 1028 batadv_neigh_node_free_ref(neigh_node); 1029 neigh_node = tmp_neigh_node; 1030 continue; 1031 } 1032 1033 if (dup_status != BATADV_NO_DUP) 1034 continue; 1035 1036 /* only update the entry for this outgoing interface */ 1037 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node, 1038 if_outgoing); 1039 if (!neigh_ifinfo) 1040 continue; 1041 1042 spin_lock_bh(&tmp_neigh_node->ifinfo_lock); 1043 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, 1044 &neigh_ifinfo->bat_iv.tq_index, 0); 1045 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); 1046 neigh_ifinfo->bat_iv.tq_avg = tq_avg; 1047 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock); 1048 1049 batadv_neigh_ifinfo_free_ref(neigh_ifinfo); 1050 neigh_ifinfo = NULL; 1051 } 1052 1053 if (!neigh_node) { 1054 struct batadv_orig_node *orig_tmp; 1055 1056 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); 1057 if (!orig_tmp) 1058 goto unlock; 1059 1060 neigh_node = batadv_iv_ogm_neigh_new(if_incoming, 1061 ethhdr->h_source, 1062 orig_node, orig_tmp); 1063 1064 batadv_orig_node_free_ref(orig_tmp); 1065 if (!neigh_node) 1066 goto unlock; 1067 } else { 1068 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1069 "Updating existing last-hop neighbor of originator\n"); 1070 } 1071 1072 rcu_read_unlock(); 1073 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); 1074 if (!neigh_ifinfo) 1075 goto out; 1076 1077 neigh_node->last_seen = jiffies; 1078 1079 spin_lock_bh(&neigh_node->ifinfo_lock); 1080 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, 1081 &neigh_ifinfo->bat_iv.tq_index, 1082 batadv_ogm_packet->tq); 1083 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); 1084 neigh_ifinfo->bat_iv.tq_avg = tq_avg; 1085 spin_unlock_bh(&neigh_node->ifinfo_lock); 1086 1087 if (dup_status == BATADV_NO_DUP) { 1088 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl; 1089 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl; 1090 } 1091 1092 /* if this neighbor already is our next hop there is nothing 1093 * to change 1094 */ 1095 router = batadv_orig_router_get(orig_node, if_outgoing); 1096 if (router == neigh_node) 1097 goto out; 1098 1099 if (router) { 1100 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); 1101 if (!router_ifinfo) 1102 goto out; 1103 1104 /* if this neighbor does not offer a better TQ we won't 1105 * consider it 1106 */ 1107 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg) 1108 goto out; 1109 } 1110 1111 /* if the TQ is the same and the link not more symmetric we 1112 * won't consider it either 1113 */ 1114 if (router_ifinfo && 1115 neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) { 1116 orig_node_tmp = router->orig_node; 1117 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1118 if_num = router->if_incoming->if_num; 1119 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; 1120 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1121 1122 orig_node_tmp = neigh_node->orig_node; 1123 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1124 if_num = neigh_node->if_incoming->if_num; 1125 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; 1126 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1127 1128 if (sum_orig >= sum_neigh) 1129 goto out; 1130 } 1131 1132 batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); 1133 goto out; 1134 1135 unlock: 1136 rcu_read_unlock(); 1137 out: 1138 if (neigh_node) 1139 batadv_neigh_node_free_ref(neigh_node); 1140 if (router) 1141 batadv_neigh_node_free_ref(router); 1142 if (neigh_ifinfo) 1143 batadv_neigh_ifinfo_free_ref(neigh_ifinfo); 1144 if (router_ifinfo) 1145 batadv_neigh_ifinfo_free_ref(router_ifinfo); 1146 } 1147 1148 /** 1149 * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet 1150 * @orig_node: the orig node who originally emitted the ogm packet 1151 * @orig_neigh_node: the orig node struct of the neighbor who sent the packet 1152 * @batadv_ogm_packet: the ogm packet 1153 * @if_incoming: interface where the packet was received 1154 * @if_outgoing: interface for which the retransmission should be considered 1155 * 1156 * Returns 1 if the link can be considered bidirectional, 0 otherwise 1157 */ 1158 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, 1159 struct batadv_orig_node *orig_neigh_node, 1160 struct batadv_ogm_packet *batadv_ogm_packet, 1161 struct batadv_hard_iface *if_incoming, 1162 struct batadv_hard_iface *if_outgoing) 1163 { 1164 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1165 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; 1166 struct batadv_neigh_ifinfo *neigh_ifinfo; 1167 uint8_t total_count; 1168 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; 1169 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; 1170 int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0; 1171 unsigned int combined_tq; 1172 int tq_iface_penalty; 1173 1174 /* find corresponding one hop neighbor */ 1175 rcu_read_lock(); 1176 hlist_for_each_entry_rcu(tmp_neigh_node, 1177 &orig_neigh_node->neigh_list, list) { 1178 if (!batadv_compare_eth(tmp_neigh_node->addr, 1179 orig_neigh_node->orig)) 1180 continue; 1181 1182 if (tmp_neigh_node->if_incoming != if_incoming) 1183 continue; 1184 1185 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) 1186 continue; 1187 1188 neigh_node = tmp_neigh_node; 1189 break; 1190 } 1191 rcu_read_unlock(); 1192 1193 if (!neigh_node) 1194 neigh_node = batadv_iv_ogm_neigh_new(if_incoming, 1195 orig_neigh_node->orig, 1196 orig_neigh_node, 1197 orig_neigh_node); 1198 1199 if (!neigh_node) 1200 goto out; 1201 1202 /* if orig_node is direct neighbor update neigh_node last_seen */ 1203 if (orig_node == orig_neigh_node) 1204 neigh_node->last_seen = jiffies; 1205 1206 orig_node->last_seen = jiffies; 1207 1208 /* find packet count of corresponding one hop neighbor */ 1209 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1210 if_num = if_incoming->if_num; 1211 orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num]; 1212 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); 1213 if (neigh_ifinfo) { 1214 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count; 1215 batadv_neigh_ifinfo_free_ref(neigh_ifinfo); 1216 } else { 1217 neigh_rq_count = 0; 1218 } 1219 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1220 1221 /* pay attention to not get a value bigger than 100 % */ 1222 if (orig_eq_count > neigh_rq_count) 1223 total_count = neigh_rq_count; 1224 else 1225 total_count = orig_eq_count; 1226 1227 /* if we have too few packets (too less data) we set tq_own to zero 1228 * if we receive too few packets it is not considered bidirectional 1229 */ 1230 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || 1231 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) 1232 tq_own = 0; 1233 else 1234 /* neigh_node->real_packet_count is never zero as we 1235 * only purge old information when getting new 1236 * information 1237 */ 1238 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; 1239 1240 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does 1241 * affect the nearly-symmetric links only a little, but 1242 * punishes asymmetric links more. This will give a value 1243 * between 0 and TQ_MAX_VALUE 1244 */ 1245 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; 1246 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; 1247 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * 1248 BATADV_TQ_LOCAL_WINDOW_SIZE * 1249 BATADV_TQ_LOCAL_WINDOW_SIZE; 1250 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; 1251 inv_asym_penalty /= neigh_rq_max_cube; 1252 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; 1253 1254 /* penalize if the OGM is forwarded on the same interface. WiFi 1255 * interfaces and other half duplex devices suffer from throughput 1256 * drops as they can't send and receive at the same time. 1257 */ 1258 tq_iface_penalty = BATADV_TQ_MAX_VALUE; 1259 if (if_outgoing && (if_incoming == if_outgoing) && 1260 batadv_is_wifi_netdev(if_outgoing->net_dev)) 1261 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE, 1262 bat_priv); 1263 1264 combined_tq = batadv_ogm_packet->tq * 1265 tq_own * 1266 tq_asym_penalty * 1267 tq_iface_penalty; 1268 combined_tq /= BATADV_TQ_MAX_VALUE * 1269 BATADV_TQ_MAX_VALUE * 1270 BATADV_TQ_MAX_VALUE; 1271 batadv_ogm_packet->tq = combined_tq; 1272 1273 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1274 "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", 1275 orig_node->orig, orig_neigh_node->orig, total_count, 1276 neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty, 1277 batadv_ogm_packet->tq, if_incoming->net_dev->name, 1278 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT"); 1279 1280 /* if link has the minimum required transmission quality 1281 * consider it bidirectional 1282 */ 1283 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) 1284 ret = 1; 1285 1286 out: 1287 if (neigh_node) 1288 batadv_neigh_node_free_ref(neigh_node); 1289 return ret; 1290 } 1291 1292 /** 1293 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces, 1294 * adjust the sequence number and find out whether it is a duplicate 1295 * @ethhdr: ethernet header of the packet 1296 * @batadv_ogm_packet: OGM packet to be considered 1297 * @if_incoming: interface on which the OGM packet was received 1298 * @if_outgoing: interface for which the retransmission should be considered 1299 * 1300 * Returns duplicate status as enum batadv_dup_status 1301 */ 1302 static enum batadv_dup_status 1303 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, 1304 const struct batadv_ogm_packet *batadv_ogm_packet, 1305 const struct batadv_hard_iface *if_incoming, 1306 struct batadv_hard_iface *if_outgoing) 1307 { 1308 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1309 struct batadv_orig_node *orig_node; 1310 struct batadv_orig_ifinfo *orig_ifinfo = NULL; 1311 struct batadv_neigh_node *neigh_node; 1312 struct batadv_neigh_ifinfo *neigh_ifinfo; 1313 int is_dup; 1314 int32_t seq_diff; 1315 int need_update = 0; 1316 int set_mark; 1317 enum batadv_dup_status ret = BATADV_NO_DUP; 1318 uint32_t seqno = ntohl(batadv_ogm_packet->seqno); 1319 uint8_t *neigh_addr; 1320 uint8_t packet_count; 1321 unsigned long *bitmap; 1322 1323 orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); 1324 if (!orig_node) 1325 return BATADV_NO_DUP; 1326 1327 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); 1328 if (WARN_ON(!orig_ifinfo)) { 1329 batadv_orig_node_free_ref(orig_node); 1330 return 0; 1331 } 1332 1333 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1334 seq_diff = seqno - orig_ifinfo->last_real_seqno; 1335 1336 /* signalize caller that the packet is to be dropped. */ 1337 if (!hlist_empty(&orig_node->neigh_list) && 1338 batadv_window_protected(bat_priv, seq_diff, 1339 &orig_ifinfo->batman_seqno_reset)) { 1340 ret = BATADV_PROTECTED; 1341 goto out; 1342 } 1343 1344 rcu_read_lock(); 1345 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { 1346 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, 1347 if_outgoing); 1348 if (!neigh_ifinfo) 1349 continue; 1350 1351 neigh_addr = neigh_node->addr; 1352 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits, 1353 orig_ifinfo->last_real_seqno, 1354 seqno); 1355 1356 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && 1357 neigh_node->if_incoming == if_incoming) { 1358 set_mark = 1; 1359 if (is_dup) 1360 ret = BATADV_NEIGH_DUP; 1361 } else { 1362 set_mark = 0; 1363 if (is_dup && (ret != BATADV_NEIGH_DUP)) 1364 ret = BATADV_ORIG_DUP; 1365 } 1366 1367 /* if the window moved, set the update flag. */ 1368 bitmap = neigh_ifinfo->bat_iv.real_bits; 1369 need_update |= batadv_bit_get_packet(bat_priv, bitmap, 1370 seq_diff, set_mark); 1371 1372 packet_count = bitmap_weight(bitmap, 1373 BATADV_TQ_LOCAL_WINDOW_SIZE); 1374 neigh_ifinfo->bat_iv.real_packet_count = packet_count; 1375 batadv_neigh_ifinfo_free_ref(neigh_ifinfo); 1376 } 1377 rcu_read_unlock(); 1378 1379 if (need_update) { 1380 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1381 "%s updating last_seqno: old %u, new %u\n", 1382 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT", 1383 orig_ifinfo->last_real_seqno, seqno); 1384 orig_ifinfo->last_real_seqno = seqno; 1385 } 1386 1387 out: 1388 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1389 batadv_orig_node_free_ref(orig_node); 1390 batadv_orig_ifinfo_free_ref(orig_ifinfo); 1391 return ret; 1392 } 1393 1394 /** 1395 * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if 1396 * @skb: the skb containing the OGM 1397 * @ogm_offset: offset from skb->data to start of ogm header 1398 * @orig_node: the (cached) orig node for the originator of this OGM 1399 * @if_incoming: the interface where this packet was received 1400 * @if_outgoing: the interface for which the packet should be considered 1401 */ 1402 static void 1403 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, 1404 struct batadv_orig_node *orig_node, 1405 struct batadv_hard_iface *if_incoming, 1406 struct batadv_hard_iface *if_outgoing) 1407 { 1408 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1409 struct batadv_neigh_node *router = NULL, *router_router = NULL; 1410 struct batadv_orig_node *orig_neigh_node; 1411 struct batadv_orig_ifinfo *orig_ifinfo; 1412 struct batadv_neigh_node *orig_neigh_router = NULL; 1413 struct batadv_neigh_ifinfo *router_ifinfo = NULL; 1414 struct batadv_ogm_packet *ogm_packet; 1415 enum batadv_dup_status dup_status; 1416 bool is_from_best_next_hop = false; 1417 bool is_single_hop_neigh = false; 1418 bool sameseq, similar_ttl; 1419 struct sk_buff *skb_priv; 1420 struct ethhdr *ethhdr; 1421 uint8_t *prev_sender; 1422 int is_bidirect; 1423 1424 /* create a private copy of the skb, as some functions change tq value 1425 * and/or flags. 1426 */ 1427 skb_priv = skb_copy(skb, GFP_ATOMIC); 1428 if (!skb_priv) 1429 return; 1430 1431 ethhdr = eth_hdr(skb_priv); 1432 ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset); 1433 1434 dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet, 1435 if_incoming, if_outgoing); 1436 if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig)) 1437 is_single_hop_neigh = true; 1438 1439 if (dup_status == BATADV_PROTECTED) { 1440 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1441 "Drop packet: packet within seqno protection time (sender: %pM)\n", 1442 ethhdr->h_source); 1443 goto out; 1444 } 1445 1446 if (ogm_packet->tq == 0) { 1447 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1448 "Drop packet: originator packet with tq equal 0\n"); 1449 goto out; 1450 } 1451 1452 router = batadv_orig_router_get(orig_node, if_outgoing); 1453 if (router) { 1454 router_router = batadv_orig_router_get(router->orig_node, 1455 if_outgoing); 1456 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); 1457 } 1458 1459 if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) && 1460 (batadv_compare_eth(router->addr, ethhdr->h_source))) 1461 is_from_best_next_hop = true; 1462 1463 prev_sender = ogm_packet->prev_sender; 1464 /* avoid temporary routing loops */ 1465 if (router && router_router && 1466 (batadv_compare_eth(router->addr, prev_sender)) && 1467 !(batadv_compare_eth(ogm_packet->orig, prev_sender)) && 1468 (batadv_compare_eth(router->addr, router_router->addr))) { 1469 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1470 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", 1471 ethhdr->h_source); 1472 goto out; 1473 } 1474 1475 if (if_outgoing == BATADV_IF_DEFAULT) 1476 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node); 1477 1478 /* if sender is a direct neighbor the sender mac equals 1479 * originator mac 1480 */ 1481 if (is_single_hop_neigh) 1482 orig_neigh_node = orig_node; 1483 else 1484 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, 1485 ethhdr->h_source); 1486 1487 if (!orig_neigh_node) 1488 goto out; 1489 1490 /* Update nc_nodes of the originator */ 1491 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, 1492 ogm_packet, is_single_hop_neigh); 1493 1494 orig_neigh_router = batadv_orig_router_get(orig_neigh_node, 1495 if_outgoing); 1496 1497 /* drop packet if sender is not a direct neighbor and if we 1498 * don't route towards it 1499 */ 1500 if (!is_single_hop_neigh && (!orig_neigh_router)) { 1501 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1502 "Drop packet: OGM via unknown neighbor!\n"); 1503 goto out_neigh; 1504 } 1505 1506 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, 1507 ogm_packet, if_incoming, 1508 if_outgoing); 1509 1510 /* update ranking if it is not a duplicate or has the same 1511 * seqno and similar ttl as the non-duplicate 1512 */ 1513 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); 1514 if (!orig_ifinfo) 1515 goto out_neigh; 1516 1517 sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno); 1518 similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl; 1519 1520 if (is_bidirect && ((dup_status == BATADV_NO_DUP) || 1521 (sameseq && similar_ttl))) { 1522 batadv_iv_ogm_orig_update(bat_priv, orig_node, 1523 orig_ifinfo, ethhdr, 1524 ogm_packet, if_incoming, 1525 if_outgoing, dup_status); 1526 } 1527 batadv_orig_ifinfo_free_ref(orig_ifinfo); 1528 1529 /* only forward for specific interface, not for the default one. */ 1530 if (if_outgoing == BATADV_IF_DEFAULT) 1531 goto out_neigh; 1532 1533 /* is single hop (direct) neighbor */ 1534 if (is_single_hop_neigh) { 1535 /* OGMs from secondary interfaces should only scheduled once 1536 * per interface where it has been received, not multiple times 1537 */ 1538 if ((ogm_packet->ttl <= 2) && 1539 (if_incoming != if_outgoing)) { 1540 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1541 "Drop packet: OGM from secondary interface and wrong outgoing interface\n"); 1542 goto out_neigh; 1543 } 1544 /* mark direct link on incoming interface */ 1545 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, 1546 is_single_hop_neigh, 1547 is_from_best_next_hop, if_incoming, 1548 if_outgoing); 1549 1550 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1551 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); 1552 goto out_neigh; 1553 } 1554 1555 /* multihop originator */ 1556 if (!is_bidirect) { 1557 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1558 "Drop packet: not received via bidirectional link\n"); 1559 goto out_neigh; 1560 } 1561 1562 if (dup_status == BATADV_NEIGH_DUP) { 1563 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1564 "Drop packet: duplicate packet received\n"); 1565 goto out_neigh; 1566 } 1567 1568 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1569 "Forwarding packet: rebroadcast originator packet\n"); 1570 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, 1571 is_single_hop_neigh, is_from_best_next_hop, 1572 if_incoming, if_outgoing); 1573 1574 out_neigh: 1575 if ((orig_neigh_node) && (!is_single_hop_neigh)) 1576 batadv_orig_node_free_ref(orig_neigh_node); 1577 out: 1578 if (router_ifinfo) 1579 batadv_neigh_ifinfo_free_ref(router_ifinfo); 1580 if (router) 1581 batadv_neigh_node_free_ref(router); 1582 if (router_router) 1583 batadv_neigh_node_free_ref(router_router); 1584 if (orig_neigh_router) 1585 batadv_neigh_node_free_ref(orig_neigh_router); 1586 1587 kfree_skb(skb_priv); 1588 } 1589 1590 /** 1591 * batadv_iv_ogm_process - process an incoming batman iv OGM 1592 * @skb: the skb containing the OGM 1593 * @ogm_offset: offset to the OGM which should be processed (for aggregates) 1594 * @if_incoming: the interface where this packet was receved 1595 */ 1596 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, 1597 struct batadv_hard_iface *if_incoming) 1598 { 1599 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1600 struct batadv_orig_node *orig_neigh_node, *orig_node; 1601 struct batadv_hard_iface *hard_iface; 1602 struct batadv_ogm_packet *ogm_packet; 1603 uint32_t if_incoming_seqno; 1604 bool has_directlink_flag; 1605 struct ethhdr *ethhdr; 1606 bool is_my_oldorig = false; 1607 bool is_my_addr = false; 1608 bool is_my_orig = false; 1609 1610 ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset); 1611 ethhdr = eth_hdr(skb); 1612 1613 /* Silently drop when the batman packet is actually not a 1614 * correct packet. 1615 * 1616 * This might happen if a packet is padded (e.g. Ethernet has a 1617 * minimum frame length of 64 byte) and the aggregation interprets 1618 * it as an additional length. 1619 * 1620 * TODO: A more sane solution would be to have a bit in the 1621 * batadv_ogm_packet to detect whether the packet is the last 1622 * packet in an aggregation. Here we expect that the padding 1623 * is always zero (or not 0x01) 1624 */ 1625 if (ogm_packet->packet_type != BATADV_IV_OGM) 1626 return; 1627 1628 /* could be changed by schedule_own_packet() */ 1629 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); 1630 1631 if (ogm_packet->flags & BATADV_DIRECTLINK) 1632 has_directlink_flag = true; 1633 else 1634 has_directlink_flag = false; 1635 1636 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1637 "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", 1638 ethhdr->h_source, if_incoming->net_dev->name, 1639 if_incoming->net_dev->dev_addr, ogm_packet->orig, 1640 ogm_packet->prev_sender, ntohl(ogm_packet->seqno), 1641 ogm_packet->tq, ogm_packet->ttl, 1642 ogm_packet->version, has_directlink_flag); 1643 1644 rcu_read_lock(); 1645 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 1646 if (hard_iface->if_status != BATADV_IF_ACTIVE) 1647 continue; 1648 1649 if (hard_iface->soft_iface != if_incoming->soft_iface) 1650 continue; 1651 1652 if (batadv_compare_eth(ethhdr->h_source, 1653 hard_iface->net_dev->dev_addr)) 1654 is_my_addr = true; 1655 1656 if (batadv_compare_eth(ogm_packet->orig, 1657 hard_iface->net_dev->dev_addr)) 1658 is_my_orig = true; 1659 1660 if (batadv_compare_eth(ogm_packet->prev_sender, 1661 hard_iface->net_dev->dev_addr)) 1662 is_my_oldorig = true; 1663 } 1664 rcu_read_unlock(); 1665 1666 if (is_my_addr) { 1667 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1668 "Drop packet: received my own broadcast (sender: %pM)\n", 1669 ethhdr->h_source); 1670 return; 1671 } 1672 1673 if (is_my_orig) { 1674 unsigned long *word; 1675 int offset; 1676 int32_t bit_pos; 1677 int16_t if_num; 1678 uint8_t *weight; 1679 1680 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, 1681 ethhdr->h_source); 1682 if (!orig_neigh_node) 1683 return; 1684 1685 /* neighbor has to indicate direct link and it has to 1686 * come via the corresponding interface 1687 * save packet seqno for bidirectional check 1688 */ 1689 if (has_directlink_flag && 1690 batadv_compare_eth(if_incoming->net_dev->dev_addr, 1691 ogm_packet->orig)) { 1692 if_num = if_incoming->if_num; 1693 offset = if_num * BATADV_NUM_WORDS; 1694 1695 spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); 1696 word = &orig_neigh_node->bat_iv.bcast_own[offset]; 1697 bit_pos = if_incoming_seqno - 2; 1698 bit_pos -= ntohl(ogm_packet->seqno); 1699 batadv_set_bit(word, bit_pos); 1700 weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num]; 1701 *weight = bitmap_weight(word, 1702 BATADV_TQ_LOCAL_WINDOW_SIZE); 1703 spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); 1704 } 1705 1706 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1707 "Drop packet: originator packet from myself (via neighbor)\n"); 1708 batadv_orig_node_free_ref(orig_neigh_node); 1709 return; 1710 } 1711 1712 if (is_my_oldorig) { 1713 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1714 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", 1715 ethhdr->h_source); 1716 return; 1717 } 1718 1719 if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { 1720 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1721 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", 1722 ethhdr->h_source); 1723 return; 1724 } 1725 1726 orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig); 1727 if (!orig_node) 1728 return; 1729 1730 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, 1731 if_incoming, BATADV_IF_DEFAULT); 1732 1733 rcu_read_lock(); 1734 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 1735 if (hard_iface->if_status != BATADV_IF_ACTIVE) 1736 continue; 1737 1738 if (hard_iface->soft_iface != bat_priv->soft_iface) 1739 continue; 1740 1741 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, 1742 if_incoming, hard_iface); 1743 } 1744 rcu_read_unlock(); 1745 1746 batadv_orig_node_free_ref(orig_node); 1747 } 1748 1749 static int batadv_iv_ogm_receive(struct sk_buff *skb, 1750 struct batadv_hard_iface *if_incoming) 1751 { 1752 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1753 struct batadv_ogm_packet *ogm_packet; 1754 uint8_t *packet_pos; 1755 int ogm_offset; 1756 bool ret; 1757 1758 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); 1759 if (!ret) 1760 return NET_RX_DROP; 1761 1762 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface 1763 * that does not have B.A.T.M.A.N. IV enabled ? 1764 */ 1765 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) 1766 return NET_RX_DROP; 1767 1768 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); 1769 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, 1770 skb->len + ETH_HLEN); 1771 1772 ogm_offset = 0; 1773 ogm_packet = (struct batadv_ogm_packet *)skb->data; 1774 1775 /* unpack the aggregated packets and process them one by one */ 1776 while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb), 1777 ogm_packet->tvlv_len)) { 1778 batadv_iv_ogm_process(skb, ogm_offset, if_incoming); 1779 1780 ogm_offset += BATADV_OGM_HLEN; 1781 ogm_offset += ntohs(ogm_packet->tvlv_len); 1782 1783 packet_pos = skb->data + ogm_offset; 1784 ogm_packet = (struct batadv_ogm_packet *)packet_pos; 1785 } 1786 1787 kfree_skb(skb); 1788 return NET_RX_SUCCESS; 1789 } 1790 1791 /** 1792 * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table 1793 * @orig_node: the orig_node for which the neighbors are printed 1794 * @if_outgoing: outgoing interface for these entries 1795 * @seq: debugfs table seq_file struct 1796 * 1797 * Must be called while holding an rcu lock. 1798 */ 1799 static void 1800 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node, 1801 struct batadv_hard_iface *if_outgoing, 1802 struct seq_file *seq) 1803 { 1804 struct batadv_neigh_node *neigh_node; 1805 struct batadv_neigh_ifinfo *n_ifinfo; 1806 1807 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { 1808 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); 1809 if (!n_ifinfo) 1810 continue; 1811 1812 seq_printf(seq, " %pM (%3i)", 1813 neigh_node->addr, 1814 n_ifinfo->bat_iv.tq_avg); 1815 1816 batadv_neigh_ifinfo_free_ref(n_ifinfo); 1817 } 1818 } 1819 1820 /** 1821 * batadv_iv_ogm_orig_print - print the originator table 1822 * @bat_priv: the bat priv with all the soft interface information 1823 * @seq: debugfs table seq_file struct 1824 * @if_outgoing: the outgoing interface for which this should be printed 1825 */ 1826 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, 1827 struct seq_file *seq, 1828 struct batadv_hard_iface *if_outgoing) 1829 { 1830 struct batadv_neigh_node *neigh_node; 1831 struct batadv_hashtable *hash = bat_priv->orig_hash; 1832 int last_seen_msecs, last_seen_secs; 1833 struct batadv_orig_node *orig_node; 1834 struct batadv_neigh_ifinfo *n_ifinfo; 1835 unsigned long last_seen_jiffies; 1836 struct hlist_head *head; 1837 int batman_count = 0; 1838 uint32_t i; 1839 1840 seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n", 1841 "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE, 1842 "Nexthop", "outgoingIF", "Potential nexthops"); 1843 1844 for (i = 0; i < hash->size; i++) { 1845 head = &hash->table[i]; 1846 1847 rcu_read_lock(); 1848 hlist_for_each_entry_rcu(orig_node, head, hash_entry) { 1849 neigh_node = batadv_orig_router_get(orig_node, 1850 if_outgoing); 1851 if (!neigh_node) 1852 continue; 1853 1854 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, 1855 if_outgoing); 1856 if (!n_ifinfo) 1857 goto next; 1858 1859 if (n_ifinfo->bat_iv.tq_avg == 0) 1860 goto next; 1861 1862 last_seen_jiffies = jiffies - orig_node->last_seen; 1863 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); 1864 last_seen_secs = last_seen_msecs / 1000; 1865 last_seen_msecs = last_seen_msecs % 1000; 1866 1867 seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", 1868 orig_node->orig, last_seen_secs, 1869 last_seen_msecs, n_ifinfo->bat_iv.tq_avg, 1870 neigh_node->addr, 1871 neigh_node->if_incoming->net_dev->name); 1872 1873 batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing, 1874 seq); 1875 seq_puts(seq, "\n"); 1876 batman_count++; 1877 1878 next: 1879 batadv_neigh_node_free_ref(neigh_node); 1880 if (n_ifinfo) 1881 batadv_neigh_ifinfo_free_ref(n_ifinfo); 1882 } 1883 rcu_read_unlock(); 1884 } 1885 1886 if (batman_count == 0) 1887 seq_puts(seq, "No batman nodes in range ...\n"); 1888 } 1889 1890 /** 1891 * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors 1892 * @neigh1: the first neighbor object of the comparison 1893 * @if_outgoing1: outgoing interface for the first neighbor 1894 * @neigh2: the second neighbor object of the comparison 1895 * @if_outgoing2: outgoing interface for the second neighbor 1896 * 1897 * Returns a value less, equal to or greater than 0 if the metric via neigh1 is 1898 * lower, the same as or higher than the metric via neigh2 1899 */ 1900 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, 1901 struct batadv_hard_iface *if_outgoing1, 1902 struct batadv_neigh_node *neigh2, 1903 struct batadv_hard_iface *if_outgoing2) 1904 { 1905 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; 1906 uint8_t tq1, tq2; 1907 int diff; 1908 1909 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); 1910 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); 1911 1912 if (!neigh1_ifinfo || !neigh2_ifinfo) { 1913 diff = 0; 1914 goto out; 1915 } 1916 1917 tq1 = neigh1_ifinfo->bat_iv.tq_avg; 1918 tq2 = neigh2_ifinfo->bat_iv.tq_avg; 1919 diff = tq1 - tq2; 1920 1921 out: 1922 if (neigh1_ifinfo) 1923 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo); 1924 if (neigh2_ifinfo) 1925 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo); 1926 1927 return diff; 1928 } 1929 1930 /** 1931 * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than 1932 * neigh2 from the metric prospective 1933 * @neigh1: the first neighbor object of the comparison 1934 * @if_outgoing1: outgoing interface for the first neighbor 1935 * @neigh2: the second neighbor object of the comparison 1936 * @if_outgoing2: outgoing interface for the second neighbor 1937 * 1938 * Returns true if the metric via neigh1 is equally good or better than 1939 * the metric via neigh2, false otherwise. 1940 */ 1941 static bool 1942 batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1, 1943 struct batadv_hard_iface *if_outgoing1, 1944 struct batadv_neigh_node *neigh2, 1945 struct batadv_hard_iface *if_outgoing2) 1946 { 1947 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; 1948 uint8_t tq1, tq2; 1949 bool ret; 1950 1951 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); 1952 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); 1953 1954 /* we can't say that the metric is better */ 1955 if (!neigh1_ifinfo || !neigh2_ifinfo) { 1956 ret = false; 1957 goto out; 1958 } 1959 1960 tq1 = neigh1_ifinfo->bat_iv.tq_avg; 1961 tq2 = neigh2_ifinfo->bat_iv.tq_avg; 1962 ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD; 1963 1964 out: 1965 if (neigh1_ifinfo) 1966 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo); 1967 if (neigh2_ifinfo) 1968 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo); 1969 1970 return ret; 1971 } 1972 1973 static struct batadv_algo_ops batadv_batman_iv __read_mostly = { 1974 .name = "BATMAN_IV", 1975 .bat_iface_enable = batadv_iv_ogm_iface_enable, 1976 .bat_iface_disable = batadv_iv_ogm_iface_disable, 1977 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, 1978 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, 1979 .bat_ogm_schedule = batadv_iv_ogm_schedule, 1980 .bat_ogm_emit = batadv_iv_ogm_emit, 1981 .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp, 1982 .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob, 1983 .bat_orig_print = batadv_iv_ogm_orig_print, 1984 .bat_orig_free = batadv_iv_ogm_orig_free, 1985 .bat_orig_add_if = batadv_iv_ogm_orig_add_if, 1986 .bat_orig_del_if = batadv_iv_ogm_orig_del_if, 1987 }; 1988 1989 int __init batadv_iv_init(void) 1990 { 1991 int ret; 1992 1993 /* batman originator packet */ 1994 ret = batadv_recv_handler_register(BATADV_IV_OGM, 1995 batadv_iv_ogm_receive); 1996 if (ret < 0) 1997 goto out; 1998 1999 ret = batadv_algo_register(&batadv_batman_iv); 2000 if (ret < 0) 2001 goto handler_unregister; 2002 2003 goto out; 2004 2005 handler_unregister: 2006 batadv_recv_handler_unregister(BATADV_IV_OGM); 2007 out: 2008 return ret; 2009 } 2010