1 /* Copyright (C) 2007-2016 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/kref.h> 35 #include <linux/netdevice.h> 36 #include <linux/pkt_sched.h> 37 #include <linux/printk.h> 38 #include <linux/random.h> 39 #include <linux/rculist.h> 40 #include <linux/rcupdate.h> 41 #include <linux/seq_file.h> 42 #include <linux/skbuff.h> 43 #include <linux/slab.h> 44 #include <linux/spinlock.h> 45 #include <linux/stddef.h> 46 #include <linux/string.h> 47 #include <linux/types.h> 48 #include <linux/workqueue.h> 49 50 #include "bitarray.h" 51 #include "hard-interface.h" 52 #include "hash.h" 53 #include "network-coding.h" 54 #include "originator.h" 55 #include "packet.h" 56 #include "routing.h" 57 #include "send.h" 58 #include "translation-table.h" 59 60 /** 61 * enum batadv_dup_status - duplicate status 62 * @BATADV_NO_DUP: the packet is no duplicate 63 * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the 64 * neighbor) 65 * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor 66 * @BATADV_PROTECTED: originator is currently protected (after reboot) 67 */ 68 enum batadv_dup_status { 69 BATADV_NO_DUP = 0, 70 BATADV_ORIG_DUP, 71 BATADV_NEIGH_DUP, 72 BATADV_PROTECTED, 73 }; 74 75 /** 76 * batadv_ring_buffer_set - update the ring buffer with the given value 77 * @lq_recv: pointer to the ring buffer 78 * @lq_index: index to store the value at 79 * @value: value to store in the ring buffer 80 */ 81 static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 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 * Return: computed average value. 93 */ 94 static u8 batadv_ring_buffer_avg(const u8 lq_recv[]) 95 { 96 const u8 *ptr; 97 u16 count = 0; 98 u16 i = 0; 99 u16 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 (u8)(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 * Return: 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(u8), 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(u8)); 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 * Return: 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 ret = -ENOMEM; 190 size_t chunk_size, if_offset; 191 void *data_ptr = NULL; 192 193 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 194 195 /* last interface was removed */ 196 if (max_if_num == 0) 197 goto free_bcast_own; 198 199 chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; 200 data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC); 201 if (!data_ptr) 202 goto unlock; 203 204 /* copy first part */ 205 memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); 206 207 /* copy second part */ 208 if_offset = (del_if_num + 1) * chunk_size; 209 memcpy((char *)data_ptr + del_if_num * chunk_size, 210 (uint8_t *)orig_node->bat_iv.bcast_own + if_offset, 211 (max_if_num - del_if_num) * chunk_size); 212 213 free_bcast_own: 214 kfree(orig_node->bat_iv.bcast_own); 215 orig_node->bat_iv.bcast_own = data_ptr; 216 217 if (max_if_num == 0) 218 goto free_own_sum; 219 220 data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC); 221 if (!data_ptr) { 222 kfree(orig_node->bat_iv.bcast_own); 223 goto unlock; 224 } 225 226 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, 227 del_if_num * sizeof(u8)); 228 229 if_offset = (del_if_num + 1) * sizeof(u8); 230 memcpy((char *)data_ptr + del_if_num * sizeof(u8), 231 orig_node->bat_iv.bcast_own_sum + if_offset, 232 (max_if_num - del_if_num) * sizeof(u8)); 233 234 free_own_sum: 235 kfree(orig_node->bat_iv.bcast_own_sum); 236 orig_node->bat_iv.bcast_own_sum = data_ptr; 237 238 ret = 0; 239 unlock: 240 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 241 242 return ret; 243 } 244 245 /** 246 * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator 247 * @bat_priv: the bat priv with all the soft interface information 248 * @addr: mac address of the originator 249 * 250 * Return: the originator object corresponding to the passed mac address or NULL 251 * on failure. 252 * If the object does not exists it is created an initialised. 253 */ 254 static struct batadv_orig_node * 255 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr) 256 { 257 struct batadv_orig_node *orig_node; 258 int size, hash_added; 259 260 orig_node = batadv_orig_hash_find(bat_priv, addr); 261 if (orig_node) 262 return orig_node; 263 264 orig_node = batadv_orig_node_new(bat_priv, addr); 265 if (!orig_node) 266 return NULL; 267 268 spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock); 269 270 size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; 271 orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC); 272 if (!orig_node->bat_iv.bcast_own) 273 goto free_orig_node; 274 275 size = bat_priv->num_ifaces * sizeof(u8); 276 orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC); 277 if (!orig_node->bat_iv.bcast_own_sum) 278 goto free_orig_node; 279 280 hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, 281 batadv_choose_orig, orig_node, 282 &orig_node->hash_entry); 283 if (hash_added != 0) 284 goto free_orig_node; 285 286 return orig_node; 287 288 free_orig_node: 289 /* free twice, as batadv_orig_node_new sets refcount to 2 */ 290 batadv_orig_node_put(orig_node); 291 batadv_orig_node_put(orig_node); 292 293 return NULL; 294 } 295 296 static struct batadv_neigh_node * 297 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, 298 const u8 *neigh_addr, 299 struct batadv_orig_node *orig_node, 300 struct batadv_orig_node *orig_neigh) 301 { 302 struct batadv_neigh_node *neigh_node; 303 304 neigh_node = batadv_neigh_node_new(orig_node, hard_iface, neigh_addr); 305 if (!neigh_node) 306 goto out; 307 308 neigh_node->orig_node = orig_neigh; 309 310 out: 311 return neigh_node; 312 } 313 314 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) 315 { 316 struct batadv_ogm_packet *batadv_ogm_packet; 317 unsigned char *ogm_buff; 318 u32 random_seqno; 319 320 /* randomize initial seqno to avoid collision */ 321 get_random_bytes(&random_seqno, sizeof(random_seqno)); 322 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); 323 324 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; 325 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); 326 if (!ogm_buff) 327 return -ENOMEM; 328 329 hard_iface->bat_iv.ogm_buff = ogm_buff; 330 331 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 332 batadv_ogm_packet->packet_type = BATADV_IV_OGM; 333 batadv_ogm_packet->version = BATADV_COMPAT_VERSION; 334 batadv_ogm_packet->ttl = 2; 335 batadv_ogm_packet->flags = BATADV_NO_FLAGS; 336 batadv_ogm_packet->reserved = 0; 337 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; 338 339 return 0; 340 } 341 342 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) 343 { 344 kfree(hard_iface->bat_iv.ogm_buff); 345 hard_iface->bat_iv.ogm_buff = NULL; 346 } 347 348 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) 349 { 350 struct batadv_ogm_packet *batadv_ogm_packet; 351 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; 352 353 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 354 ether_addr_copy(batadv_ogm_packet->orig, 355 hard_iface->net_dev->dev_addr); 356 ether_addr_copy(batadv_ogm_packet->prev_sender, 357 hard_iface->net_dev->dev_addr); 358 } 359 360 static void 361 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) 362 { 363 struct batadv_ogm_packet *batadv_ogm_packet; 364 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; 365 366 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 367 batadv_ogm_packet->ttl = BATADV_TTL; 368 } 369 370 /* when do we schedule our own ogm to be sent */ 371 static unsigned long 372 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) 373 { 374 unsigned int msecs; 375 376 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; 377 msecs += prandom_u32() % (2 * BATADV_JITTER); 378 379 return jiffies + msecs_to_jiffies(msecs); 380 } 381 382 /* when do we schedule a ogm packet to be sent */ 383 static unsigned long batadv_iv_ogm_fwd_send_time(void) 384 { 385 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); 386 } 387 388 /* apply hop penalty for a normal link */ 389 static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv) 390 { 391 int hop_penalty = atomic_read(&bat_priv->hop_penalty); 392 int new_tq; 393 394 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); 395 new_tq /= BATADV_TQ_MAX_VALUE; 396 397 return new_tq; 398 } 399 400 /** 401 * batadv_iv_ogm_aggr_packet - checks if there is another OGM attached 402 * @buff_pos: current position in the skb 403 * @packet_len: total length of the skb 404 * @tvlv_len: tvlv length of the previously considered OGM 405 * 406 * Return: true if there is enough space for another OGM, false otherwise. 407 */ 408 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, 409 __be16 tvlv_len) 410 { 411 int next_buff_pos = 0; 412 413 next_buff_pos += buff_pos + BATADV_OGM_HLEN; 414 next_buff_pos += ntohs(tvlv_len); 415 416 return (next_buff_pos <= packet_len) && 417 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); 418 } 419 420 /* send a batman ogm to a given interface */ 421 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, 422 struct batadv_hard_iface *hard_iface) 423 { 424 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 425 const char *fwd_str; 426 u8 packet_num; 427 s16 buff_pos; 428 struct batadv_ogm_packet *batadv_ogm_packet; 429 struct sk_buff *skb; 430 u8 *packet_pos; 431 432 if (hard_iface->if_status != BATADV_IF_ACTIVE) 433 return; 434 435 packet_num = 0; 436 buff_pos = 0; 437 packet_pos = forw_packet->skb->data; 438 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 439 440 /* adjust all flags and log packets */ 441 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, 442 batadv_ogm_packet->tvlv_len)) { 443 /* we might have aggregated direct link packets with an 444 * ordinary base packet 445 */ 446 if (forw_packet->direct_link_flags & BIT(packet_num) && 447 forw_packet->if_incoming == hard_iface) 448 batadv_ogm_packet->flags |= BATADV_DIRECTLINK; 449 else 450 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; 451 452 if (packet_num > 0 || !forw_packet->own) 453 fwd_str = "Forwarding"; 454 else 455 fwd_str = "Sending own"; 456 457 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 458 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n", 459 fwd_str, (packet_num > 0 ? "aggregated " : ""), 460 batadv_ogm_packet->orig, 461 ntohl(batadv_ogm_packet->seqno), 462 batadv_ogm_packet->tq, batadv_ogm_packet->ttl, 463 ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ? 464 "on" : "off"), 465 hard_iface->net_dev->name, 466 hard_iface->net_dev->dev_addr); 467 468 buff_pos += BATADV_OGM_HLEN; 469 buff_pos += ntohs(batadv_ogm_packet->tvlv_len); 470 packet_num++; 471 packet_pos = forw_packet->skb->data + buff_pos; 472 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 473 } 474 475 /* create clone because function is called more than once */ 476 skb = skb_clone(forw_packet->skb, GFP_ATOMIC); 477 if (skb) { 478 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); 479 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, 480 skb->len + ETH_HLEN); 481 batadv_send_broadcast_skb(skb, hard_iface); 482 } 483 } 484 485 /* send a batman ogm packet */ 486 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) 487 { 488 struct net_device *soft_iface; 489 struct batadv_priv *bat_priv; 490 struct batadv_hard_iface *primary_if = NULL; 491 492 if (!forw_packet->if_incoming) { 493 pr_err("Error - can't forward packet: incoming iface not specified\n"); 494 goto out; 495 } 496 497 soft_iface = forw_packet->if_incoming->soft_iface; 498 bat_priv = netdev_priv(soft_iface); 499 500 if (WARN_ON(!forw_packet->if_outgoing)) 501 goto out; 502 503 if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface)) 504 goto out; 505 506 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) 507 goto out; 508 509 primary_if = batadv_primary_if_get_selected(bat_priv); 510 if (!primary_if) 511 goto out; 512 513 /* only for one specific outgoing interface */ 514 batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing); 515 516 out: 517 if (primary_if) 518 batadv_hardif_put(primary_if); 519 } 520 521 /** 522 * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an 523 * existing forward packet 524 * @new_bat_ogm_packet: OGM packet to be aggregated 525 * @bat_priv: the bat priv with all the soft interface information 526 * @packet_len: (total) length of the OGM 527 * @send_time: timestamp (jiffies) when the packet is to be sent 528 * @directlink: true if this is a direct link packet 529 * @if_incoming: interface where the packet was received 530 * @if_outgoing: interface for which the retransmission should be considered 531 * @forw_packet: the forwarded packet which should be checked 532 * 533 * Return: true if new_packet can be aggregated with forw_packet 534 */ 535 static bool 536 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, 537 struct batadv_priv *bat_priv, 538 int packet_len, unsigned long send_time, 539 bool directlink, 540 const struct batadv_hard_iface *if_incoming, 541 const struct batadv_hard_iface *if_outgoing, 542 const struct batadv_forw_packet *forw_packet) 543 { 544 struct batadv_ogm_packet *batadv_ogm_packet; 545 int aggregated_bytes = forw_packet->packet_len + packet_len; 546 struct batadv_hard_iface *primary_if = NULL; 547 bool res = false; 548 unsigned long aggregation_end_time; 549 550 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; 551 aggregation_end_time = send_time; 552 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); 553 554 /* we can aggregate the current packet to this aggregated packet 555 * if: 556 * 557 * - the send time is within our MAX_AGGREGATION_MS time 558 * - the resulting packet wont be bigger than 559 * MAX_AGGREGATION_BYTES 560 * otherwise aggregation is not possible 561 */ 562 if (!time_before(send_time, forw_packet->send_time) || 563 !time_after_eq(aggregation_end_time, forw_packet->send_time)) 564 return false; 565 566 if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES) 567 return false; 568 569 /* packet is not leaving on the same interface. */ 570 if (forw_packet->if_outgoing != if_outgoing) 571 return false; 572 573 /* check aggregation compatibility 574 * -> direct link packets are broadcasted on 575 * their interface only 576 * -> aggregate packet if the current packet is 577 * a "global" packet as well as the base 578 * packet 579 */ 580 primary_if = batadv_primary_if_get_selected(bat_priv); 581 if (!primary_if) 582 return false; 583 584 /* packets without direct link flag and high TTL 585 * are flooded through the net 586 */ 587 if (!directlink && 588 !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) && 589 batadv_ogm_packet->ttl != 1 && 590 591 /* own packets originating non-primary 592 * interfaces leave only that interface 593 */ 594 (!forw_packet->own || 595 forw_packet->if_incoming == primary_if)) { 596 res = true; 597 goto out; 598 } 599 600 /* if the incoming packet is sent via this one 601 * interface only - we still can aggregate 602 */ 603 if (directlink && 604 new_bat_ogm_packet->ttl == 1 && 605 forw_packet->if_incoming == if_incoming && 606 607 /* packets from direct neighbors or 608 * own secondary interface packets 609 * (= secondary interface packets in general) 610 */ 611 (batadv_ogm_packet->flags & BATADV_DIRECTLINK || 612 (forw_packet->own && 613 forw_packet->if_incoming != primary_if))) { 614 res = true; 615 goto out; 616 } 617 618 out: 619 if (primary_if) 620 batadv_hardif_put(primary_if); 621 return res; 622 } 623 624 /** 625 * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this 626 * packet to it. 627 * @packet_buff: pointer to the OGM 628 * @packet_len: (total) length of the OGM 629 * @send_time: timestamp (jiffies) when the packet is to be sent 630 * @direct_link: whether this OGM has direct link status 631 * @if_incoming: interface where the packet was received 632 * @if_outgoing: interface for which the retransmission should be considered 633 * @own_packet: true if it is a self-generated ogm 634 */ 635 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, 636 int packet_len, unsigned long send_time, 637 bool direct_link, 638 struct batadv_hard_iface *if_incoming, 639 struct batadv_hard_iface *if_outgoing, 640 int own_packet) 641 { 642 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 643 struct batadv_forw_packet *forw_packet_aggr; 644 unsigned char *skb_buff; 645 unsigned int skb_size; 646 647 if (!kref_get_unless_zero(&if_incoming->refcount)) 648 return; 649 650 if (!kref_get_unless_zero(&if_outgoing->refcount)) 651 goto out_free_incoming; 652 653 /* own packet should always be scheduled */ 654 if (!own_packet) { 655 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { 656 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 657 "batman packet queue full\n"); 658 goto out_free_outgoing; 659 } 660 } 661 662 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); 663 if (!forw_packet_aggr) 664 goto out_nomem; 665 666 if (atomic_read(&bat_priv->aggregated_ogms) && 667 packet_len < BATADV_MAX_AGGREGATION_BYTES) 668 skb_size = BATADV_MAX_AGGREGATION_BYTES; 669 else 670 skb_size = packet_len; 671 672 skb_size += ETH_HLEN; 673 674 forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size); 675 if (!forw_packet_aggr->skb) 676 goto out_free_forw_packet; 677 forw_packet_aggr->skb->priority = TC_PRIO_CONTROL; 678 skb_reserve(forw_packet_aggr->skb, ETH_HLEN); 679 680 skb_buff = skb_put(forw_packet_aggr->skb, packet_len); 681 forw_packet_aggr->packet_len = packet_len; 682 memcpy(skb_buff, packet_buff, packet_len); 683 684 forw_packet_aggr->own = own_packet; 685 forw_packet_aggr->if_incoming = if_incoming; 686 forw_packet_aggr->if_outgoing = if_outgoing; 687 forw_packet_aggr->num_packets = 0; 688 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; 689 forw_packet_aggr->send_time = send_time; 690 691 /* save packet direct link flag status */ 692 if (direct_link) 693 forw_packet_aggr->direct_link_flags |= 1; 694 695 /* add new packet to packet list */ 696 spin_lock_bh(&bat_priv->forw_bat_list_lock); 697 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); 698 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 699 700 /* start timer for this packet */ 701 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, 702 batadv_send_outstanding_bat_ogm_packet); 703 queue_delayed_work(batadv_event_workqueue, 704 &forw_packet_aggr->delayed_work, 705 send_time - jiffies); 706 707 return; 708 out_free_forw_packet: 709 kfree(forw_packet_aggr); 710 out_nomem: 711 if (!own_packet) 712 atomic_inc(&bat_priv->batman_queue_left); 713 out_free_outgoing: 714 batadv_hardif_put(if_outgoing); 715 out_free_incoming: 716 batadv_hardif_put(if_incoming); 717 } 718 719 /* aggregate a new packet into the existing ogm packet */ 720 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, 721 const unsigned char *packet_buff, 722 int packet_len, bool direct_link) 723 { 724 unsigned char *skb_buff; 725 unsigned long new_direct_link_flag; 726 727 skb_buff = skb_put(forw_packet_aggr->skb, packet_len); 728 memcpy(skb_buff, packet_buff, packet_len); 729 forw_packet_aggr->packet_len += packet_len; 730 forw_packet_aggr->num_packets++; 731 732 /* save packet direct link flag status */ 733 if (direct_link) { 734 new_direct_link_flag = BIT(forw_packet_aggr->num_packets); 735 forw_packet_aggr->direct_link_flags |= new_direct_link_flag; 736 } 737 } 738 739 /** 740 * batadv_iv_ogm_queue_add - queue up an OGM for transmission 741 * @bat_priv: the bat priv with all the soft interface information 742 * @packet_buff: pointer to the OGM 743 * @packet_len: (total) length of the OGM 744 * @if_incoming: interface where the packet was received 745 * @if_outgoing: interface for which the retransmission should be considered 746 * @own_packet: true if it is a self-generated ogm 747 * @send_time: timestamp (jiffies) when the packet is to be sent 748 */ 749 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, 750 unsigned char *packet_buff, 751 int packet_len, 752 struct batadv_hard_iface *if_incoming, 753 struct batadv_hard_iface *if_outgoing, 754 int own_packet, unsigned long send_time) 755 { 756 /* _aggr -> pointer to the packet we want to aggregate with 757 * _pos -> pointer to the position in the queue 758 */ 759 struct batadv_forw_packet *forw_packet_aggr = NULL; 760 struct batadv_forw_packet *forw_packet_pos = NULL; 761 struct batadv_ogm_packet *batadv_ogm_packet; 762 bool direct_link; 763 unsigned long max_aggregation_jiffies; 764 765 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; 766 direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK); 767 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); 768 769 /* find position for the packet in the forward queue */ 770 spin_lock_bh(&bat_priv->forw_bat_list_lock); 771 /* own packets are not to be aggregated */ 772 if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) { 773 hlist_for_each_entry(forw_packet_pos, 774 &bat_priv->forw_bat_list, list) { 775 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, 776 bat_priv, packet_len, 777 send_time, direct_link, 778 if_incoming, 779 if_outgoing, 780 forw_packet_pos)) { 781 forw_packet_aggr = forw_packet_pos; 782 break; 783 } 784 } 785 } 786 787 /* nothing to aggregate with - either aggregation disabled or no 788 * suitable aggregation packet found 789 */ 790 if (!forw_packet_aggr) { 791 /* the following section can run without the lock */ 792 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 793 794 /* if we could not aggregate this packet with one of the others 795 * we hold it back for a while, so that it might be aggregated 796 * later on 797 */ 798 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) 799 send_time += max_aggregation_jiffies; 800 801 batadv_iv_ogm_aggregate_new(packet_buff, packet_len, 802 send_time, direct_link, 803 if_incoming, if_outgoing, 804 own_packet); 805 } else { 806 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, 807 packet_len, direct_link); 808 spin_unlock_bh(&bat_priv->forw_bat_list_lock); 809 } 810 } 811 812 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, 813 const struct ethhdr *ethhdr, 814 struct batadv_ogm_packet *batadv_ogm_packet, 815 bool is_single_hop_neigh, 816 bool is_from_best_next_hop, 817 struct batadv_hard_iface *if_incoming, 818 struct batadv_hard_iface *if_outgoing) 819 { 820 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 821 u16 tvlv_len; 822 823 if (batadv_ogm_packet->ttl <= 1) { 824 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); 825 return; 826 } 827 828 if (!is_from_best_next_hop) { 829 /* Mark the forwarded packet when it is not coming from our 830 * best next hop. We still need to forward the packet for our 831 * neighbor link quality detection to work in case the packet 832 * originated from a single hop neighbor. Otherwise we can 833 * simply drop the ogm. 834 */ 835 if (is_single_hop_neigh) 836 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; 837 else 838 return; 839 } 840 841 tvlv_len = ntohs(batadv_ogm_packet->tvlv_len); 842 843 batadv_ogm_packet->ttl--; 844 ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source); 845 846 /* apply hop penalty */ 847 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, 848 bat_priv); 849 850 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 851 "Forwarding packet: tq: %i, ttl: %i\n", 852 batadv_ogm_packet->tq, batadv_ogm_packet->ttl); 853 854 if (is_single_hop_neigh) 855 batadv_ogm_packet->flags |= BATADV_DIRECTLINK; 856 else 857 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; 858 859 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, 860 BATADV_OGM_HLEN + tvlv_len, 861 if_incoming, if_outgoing, 0, 862 batadv_iv_ogm_fwd_send_time()); 863 } 864 865 /** 866 * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for 867 * the given interface 868 * @hard_iface: the interface for which the windows have to be shifted 869 */ 870 static void 871 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) 872 { 873 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 874 struct batadv_hashtable *hash = bat_priv->orig_hash; 875 struct hlist_head *head; 876 struct batadv_orig_node *orig_node; 877 unsigned long *word; 878 u32 i; 879 size_t word_index; 880 u8 *w; 881 int if_num; 882 883 for (i = 0; i < hash->size; i++) { 884 head = &hash->table[i]; 885 886 rcu_read_lock(); 887 hlist_for_each_entry_rcu(orig_node, head, hash_entry) { 888 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 889 word_index = hard_iface->if_num * BATADV_NUM_WORDS; 890 word = &orig_node->bat_iv.bcast_own[word_index]; 891 892 batadv_bit_get_packet(bat_priv, word, 1, 0); 893 if_num = hard_iface->if_num; 894 w = &orig_node->bat_iv.bcast_own_sum[if_num]; 895 *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); 896 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 897 } 898 rcu_read_unlock(); 899 } 900 } 901 902 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) 903 { 904 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 905 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; 906 struct batadv_ogm_packet *batadv_ogm_packet; 907 struct batadv_hard_iface *primary_if, *tmp_hard_iface; 908 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; 909 u32 seqno; 910 u16 tvlv_len = 0; 911 unsigned long send_time; 912 913 primary_if = batadv_primary_if_get_selected(bat_priv); 914 915 if (hard_iface == primary_if) { 916 /* tt changes have to be committed before the tvlv data is 917 * appended as it may alter the tt tvlv container 918 */ 919 batadv_tt_local_commit_changes(bat_priv); 920 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff, 921 ogm_buff_len, 922 BATADV_OGM_HLEN); 923 } 924 925 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); 926 batadv_ogm_packet->tvlv_len = htons(tvlv_len); 927 928 /* change sequence number to network order */ 929 seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno); 930 batadv_ogm_packet->seqno = htonl(seqno); 931 atomic_inc(&hard_iface->bat_iv.ogm_seqno); 932 933 batadv_iv_ogm_slide_own_bcast_window(hard_iface); 934 935 send_time = batadv_iv_ogm_emit_send_time(bat_priv); 936 937 if (hard_iface != primary_if) { 938 /* OGMs from secondary interfaces are only scheduled on their 939 * respective interfaces. 940 */ 941 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len, 942 hard_iface, hard_iface, 1, send_time); 943 goto out; 944 } 945 946 /* OGMs from primary interfaces are scheduled on all 947 * interfaces. 948 */ 949 rcu_read_lock(); 950 list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) { 951 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface) 952 continue; 953 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, 954 *ogm_buff_len, hard_iface, 955 tmp_hard_iface, 1, send_time); 956 } 957 rcu_read_unlock(); 958 959 out: 960 if (primary_if) 961 batadv_hardif_put(primary_if); 962 } 963 964 /** 965 * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an 966 * originator 967 * @bat_priv: the bat priv with all the soft interface information 968 * @orig_node: the orig node who originally emitted the ogm packet 969 * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node 970 * @ethhdr: Ethernet header of the OGM 971 * @batadv_ogm_packet: the ogm packet 972 * @if_incoming: interface where the packet was received 973 * @if_outgoing: interface for which the retransmission should be considered 974 * @dup_status: the duplicate status of this ogm packet. 975 */ 976 static void 977 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, 978 struct batadv_orig_node *orig_node, 979 struct batadv_orig_ifinfo *orig_ifinfo, 980 const struct ethhdr *ethhdr, 981 const struct batadv_ogm_packet *batadv_ogm_packet, 982 struct batadv_hard_iface *if_incoming, 983 struct batadv_hard_iface *if_outgoing, 984 enum batadv_dup_status dup_status) 985 { 986 struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; 987 struct batadv_neigh_ifinfo *router_ifinfo = NULL; 988 struct batadv_neigh_node *neigh_node = NULL; 989 struct batadv_neigh_node *tmp_neigh_node = NULL; 990 struct batadv_neigh_node *router = NULL; 991 struct batadv_orig_node *orig_node_tmp; 992 int if_num; 993 u8 sum_orig, sum_neigh; 994 u8 *neigh_addr; 995 u8 tq_avg; 996 997 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 998 "update_originator(): Searching and updating originator entry of received packet\n"); 999 1000 rcu_read_lock(); 1001 hlist_for_each_entry_rcu(tmp_neigh_node, 1002 &orig_node->neigh_list, list) { 1003 neigh_addr = tmp_neigh_node->addr; 1004 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && 1005 tmp_neigh_node->if_incoming == if_incoming && 1006 kref_get_unless_zero(&tmp_neigh_node->refcount)) { 1007 if (WARN(neigh_node, "too many matching neigh_nodes")) 1008 batadv_neigh_node_put(neigh_node); 1009 neigh_node = tmp_neigh_node; 1010 continue; 1011 } 1012 1013 if (dup_status != BATADV_NO_DUP) 1014 continue; 1015 1016 /* only update the entry for this outgoing interface */ 1017 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node, 1018 if_outgoing); 1019 if (!neigh_ifinfo) 1020 continue; 1021 1022 spin_lock_bh(&tmp_neigh_node->ifinfo_lock); 1023 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, 1024 &neigh_ifinfo->bat_iv.tq_index, 0); 1025 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); 1026 neigh_ifinfo->bat_iv.tq_avg = tq_avg; 1027 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock); 1028 1029 batadv_neigh_ifinfo_put(neigh_ifinfo); 1030 neigh_ifinfo = NULL; 1031 } 1032 1033 if (!neigh_node) { 1034 struct batadv_orig_node *orig_tmp; 1035 1036 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); 1037 if (!orig_tmp) 1038 goto unlock; 1039 1040 neigh_node = batadv_iv_ogm_neigh_new(if_incoming, 1041 ethhdr->h_source, 1042 orig_node, orig_tmp); 1043 1044 batadv_orig_node_put(orig_tmp); 1045 if (!neigh_node) 1046 goto unlock; 1047 } else { 1048 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1049 "Updating existing last-hop neighbor of originator\n"); 1050 } 1051 1052 rcu_read_unlock(); 1053 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); 1054 if (!neigh_ifinfo) 1055 goto out; 1056 1057 neigh_node->last_seen = jiffies; 1058 1059 spin_lock_bh(&neigh_node->ifinfo_lock); 1060 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, 1061 &neigh_ifinfo->bat_iv.tq_index, 1062 batadv_ogm_packet->tq); 1063 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); 1064 neigh_ifinfo->bat_iv.tq_avg = tq_avg; 1065 spin_unlock_bh(&neigh_node->ifinfo_lock); 1066 1067 if (dup_status == BATADV_NO_DUP) { 1068 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl; 1069 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl; 1070 } 1071 1072 /* if this neighbor already is our next hop there is nothing 1073 * to change 1074 */ 1075 router = batadv_orig_router_get(orig_node, if_outgoing); 1076 if (router == neigh_node) 1077 goto out; 1078 1079 if (router) { 1080 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); 1081 if (!router_ifinfo) 1082 goto out; 1083 1084 /* if this neighbor does not offer a better TQ we won't 1085 * consider it 1086 */ 1087 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg) 1088 goto out; 1089 } 1090 1091 /* if the TQ is the same and the link not more symmetric we 1092 * won't consider it either 1093 */ 1094 if (router_ifinfo && 1095 neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) { 1096 orig_node_tmp = router->orig_node; 1097 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1098 if_num = router->if_incoming->if_num; 1099 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; 1100 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1101 1102 orig_node_tmp = neigh_node->orig_node; 1103 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1104 if_num = neigh_node->if_incoming->if_num; 1105 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; 1106 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1107 1108 if (sum_orig >= sum_neigh) 1109 goto out; 1110 } 1111 1112 batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); 1113 goto out; 1114 1115 unlock: 1116 rcu_read_unlock(); 1117 out: 1118 if (neigh_node) 1119 batadv_neigh_node_put(neigh_node); 1120 if (router) 1121 batadv_neigh_node_put(router); 1122 if (neigh_ifinfo) 1123 batadv_neigh_ifinfo_put(neigh_ifinfo); 1124 if (router_ifinfo) 1125 batadv_neigh_ifinfo_put(router_ifinfo); 1126 } 1127 1128 /** 1129 * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet 1130 * @orig_node: the orig node who originally emitted the ogm packet 1131 * @orig_neigh_node: the orig node struct of the neighbor who sent the packet 1132 * @batadv_ogm_packet: the ogm packet 1133 * @if_incoming: interface where the packet was received 1134 * @if_outgoing: interface for which the retransmission should be considered 1135 * 1136 * Return: 1 if the link can be considered bidirectional, 0 otherwise 1137 */ 1138 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, 1139 struct batadv_orig_node *orig_neigh_node, 1140 struct batadv_ogm_packet *batadv_ogm_packet, 1141 struct batadv_hard_iface *if_incoming, 1142 struct batadv_hard_iface *if_outgoing) 1143 { 1144 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1145 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; 1146 struct batadv_neigh_ifinfo *neigh_ifinfo; 1147 u8 total_count; 1148 u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; 1149 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; 1150 int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0; 1151 unsigned int combined_tq; 1152 int tq_iface_penalty; 1153 1154 /* find corresponding one hop neighbor */ 1155 rcu_read_lock(); 1156 hlist_for_each_entry_rcu(tmp_neigh_node, 1157 &orig_neigh_node->neigh_list, list) { 1158 if (!batadv_compare_eth(tmp_neigh_node->addr, 1159 orig_neigh_node->orig)) 1160 continue; 1161 1162 if (tmp_neigh_node->if_incoming != if_incoming) 1163 continue; 1164 1165 if (!kref_get_unless_zero(&tmp_neigh_node->refcount)) 1166 continue; 1167 1168 neigh_node = tmp_neigh_node; 1169 break; 1170 } 1171 rcu_read_unlock(); 1172 1173 if (!neigh_node) 1174 neigh_node = batadv_iv_ogm_neigh_new(if_incoming, 1175 orig_neigh_node->orig, 1176 orig_neigh_node, 1177 orig_neigh_node); 1178 1179 if (!neigh_node) 1180 goto out; 1181 1182 /* if orig_node is direct neighbor update neigh_node last_seen */ 1183 if (orig_node == orig_neigh_node) 1184 neigh_node->last_seen = jiffies; 1185 1186 orig_node->last_seen = jiffies; 1187 1188 /* find packet count of corresponding one hop neighbor */ 1189 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1190 if_num = if_incoming->if_num; 1191 orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num]; 1192 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); 1193 if (neigh_ifinfo) { 1194 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count; 1195 batadv_neigh_ifinfo_put(neigh_ifinfo); 1196 } else { 1197 neigh_rq_count = 0; 1198 } 1199 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1200 1201 /* pay attention to not get a value bigger than 100 % */ 1202 if (orig_eq_count > neigh_rq_count) 1203 total_count = neigh_rq_count; 1204 else 1205 total_count = orig_eq_count; 1206 1207 /* if we have too few packets (too less data) we set tq_own to zero 1208 * if we receive too few packets it is not considered bidirectional 1209 */ 1210 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || 1211 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) 1212 tq_own = 0; 1213 else 1214 /* neigh_node->real_packet_count is never zero as we 1215 * only purge old information when getting new 1216 * information 1217 */ 1218 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; 1219 1220 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does 1221 * affect the nearly-symmetric links only a little, but 1222 * punishes asymmetric links more. This will give a value 1223 * between 0 and TQ_MAX_VALUE 1224 */ 1225 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; 1226 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; 1227 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * 1228 BATADV_TQ_LOCAL_WINDOW_SIZE * 1229 BATADV_TQ_LOCAL_WINDOW_SIZE; 1230 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; 1231 inv_asym_penalty /= neigh_rq_max_cube; 1232 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; 1233 1234 /* penalize if the OGM is forwarded on the same interface. WiFi 1235 * interfaces and other half duplex devices suffer from throughput 1236 * drops as they can't send and receive at the same time. 1237 */ 1238 tq_iface_penalty = BATADV_TQ_MAX_VALUE; 1239 if (if_outgoing && (if_incoming == if_outgoing) && 1240 batadv_is_wifi_netdev(if_outgoing->net_dev)) 1241 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE, 1242 bat_priv); 1243 1244 combined_tq = batadv_ogm_packet->tq * 1245 tq_own * 1246 tq_asym_penalty * 1247 tq_iface_penalty; 1248 combined_tq /= BATADV_TQ_MAX_VALUE * 1249 BATADV_TQ_MAX_VALUE * 1250 BATADV_TQ_MAX_VALUE; 1251 batadv_ogm_packet->tq = combined_tq; 1252 1253 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1254 "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", 1255 orig_node->orig, orig_neigh_node->orig, total_count, 1256 neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty, 1257 batadv_ogm_packet->tq, if_incoming->net_dev->name, 1258 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT"); 1259 1260 /* if link has the minimum required transmission quality 1261 * consider it bidirectional 1262 */ 1263 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) 1264 ret = 1; 1265 1266 out: 1267 if (neigh_node) 1268 batadv_neigh_node_put(neigh_node); 1269 return ret; 1270 } 1271 1272 /** 1273 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces, 1274 * adjust the sequence number and find out whether it is a duplicate 1275 * @ethhdr: ethernet header of the packet 1276 * @batadv_ogm_packet: OGM packet to be considered 1277 * @if_incoming: interface on which the OGM packet was received 1278 * @if_outgoing: interface for which the retransmission should be considered 1279 * 1280 * Return: duplicate status as enum batadv_dup_status 1281 */ 1282 static enum batadv_dup_status 1283 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, 1284 const struct batadv_ogm_packet *batadv_ogm_packet, 1285 const struct batadv_hard_iface *if_incoming, 1286 struct batadv_hard_iface *if_outgoing) 1287 { 1288 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1289 struct batadv_orig_node *orig_node; 1290 struct batadv_orig_ifinfo *orig_ifinfo = NULL; 1291 struct batadv_neigh_node *neigh_node; 1292 struct batadv_neigh_ifinfo *neigh_ifinfo; 1293 int is_dup; 1294 s32 seq_diff; 1295 int need_update = 0; 1296 int set_mark; 1297 enum batadv_dup_status ret = BATADV_NO_DUP; 1298 u32 seqno = ntohl(batadv_ogm_packet->seqno); 1299 u8 *neigh_addr; 1300 u8 packet_count; 1301 unsigned long *bitmap; 1302 1303 orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); 1304 if (!orig_node) 1305 return BATADV_NO_DUP; 1306 1307 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); 1308 if (WARN_ON(!orig_ifinfo)) { 1309 batadv_orig_node_put(orig_node); 1310 return 0; 1311 } 1312 1313 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1314 seq_diff = seqno - orig_ifinfo->last_real_seqno; 1315 1316 /* signalize caller that the packet is to be dropped. */ 1317 if (!hlist_empty(&orig_node->neigh_list) && 1318 batadv_window_protected(bat_priv, seq_diff, 1319 BATADV_TQ_LOCAL_WINDOW_SIZE, 1320 &orig_ifinfo->batman_seqno_reset, NULL)) { 1321 ret = BATADV_PROTECTED; 1322 goto out; 1323 } 1324 1325 rcu_read_lock(); 1326 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { 1327 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, 1328 if_outgoing); 1329 if (!neigh_ifinfo) 1330 continue; 1331 1332 neigh_addr = neigh_node->addr; 1333 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits, 1334 orig_ifinfo->last_real_seqno, 1335 seqno); 1336 1337 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && 1338 neigh_node->if_incoming == if_incoming) { 1339 set_mark = 1; 1340 if (is_dup) 1341 ret = BATADV_NEIGH_DUP; 1342 } else { 1343 set_mark = 0; 1344 if (is_dup && (ret != BATADV_NEIGH_DUP)) 1345 ret = BATADV_ORIG_DUP; 1346 } 1347 1348 /* if the window moved, set the update flag. */ 1349 bitmap = neigh_ifinfo->bat_iv.real_bits; 1350 need_update |= batadv_bit_get_packet(bat_priv, bitmap, 1351 seq_diff, set_mark); 1352 1353 packet_count = bitmap_weight(bitmap, 1354 BATADV_TQ_LOCAL_WINDOW_SIZE); 1355 neigh_ifinfo->bat_iv.real_packet_count = packet_count; 1356 batadv_neigh_ifinfo_put(neigh_ifinfo); 1357 } 1358 rcu_read_unlock(); 1359 1360 if (need_update) { 1361 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1362 "%s updating last_seqno: old %u, new %u\n", 1363 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT", 1364 orig_ifinfo->last_real_seqno, seqno); 1365 orig_ifinfo->last_real_seqno = seqno; 1366 } 1367 1368 out: 1369 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1370 batadv_orig_node_put(orig_node); 1371 batadv_orig_ifinfo_put(orig_ifinfo); 1372 return ret; 1373 } 1374 1375 /** 1376 * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if 1377 * @skb: the skb containing the OGM 1378 * @ogm_offset: offset from skb->data to start of ogm header 1379 * @orig_node: the (cached) orig node for the originator of this OGM 1380 * @if_incoming: the interface where this packet was received 1381 * @if_outgoing: the interface for which the packet should be considered 1382 */ 1383 static void 1384 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, 1385 struct batadv_orig_node *orig_node, 1386 struct batadv_hard_iface *if_incoming, 1387 struct batadv_hard_iface *if_outgoing) 1388 { 1389 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1390 struct batadv_hardif_neigh_node *hardif_neigh = NULL; 1391 struct batadv_neigh_node *router = NULL; 1392 struct batadv_neigh_node *router_router = NULL; 1393 struct batadv_orig_node *orig_neigh_node; 1394 struct batadv_orig_ifinfo *orig_ifinfo; 1395 struct batadv_neigh_node *orig_neigh_router = NULL; 1396 struct batadv_neigh_ifinfo *router_ifinfo = NULL; 1397 struct batadv_ogm_packet *ogm_packet; 1398 enum batadv_dup_status dup_status; 1399 bool is_from_best_next_hop = false; 1400 bool is_single_hop_neigh = false; 1401 bool sameseq, similar_ttl; 1402 struct sk_buff *skb_priv; 1403 struct ethhdr *ethhdr; 1404 u8 *prev_sender; 1405 int is_bidirect; 1406 1407 /* create a private copy of the skb, as some functions change tq value 1408 * and/or flags. 1409 */ 1410 skb_priv = skb_copy(skb, GFP_ATOMIC); 1411 if (!skb_priv) 1412 return; 1413 1414 ethhdr = eth_hdr(skb_priv); 1415 ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset); 1416 1417 dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet, 1418 if_incoming, if_outgoing); 1419 if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig)) 1420 is_single_hop_neigh = true; 1421 1422 if (dup_status == BATADV_PROTECTED) { 1423 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1424 "Drop packet: packet within seqno protection time (sender: %pM)\n", 1425 ethhdr->h_source); 1426 goto out; 1427 } 1428 1429 if (ogm_packet->tq == 0) { 1430 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1431 "Drop packet: originator packet with tq equal 0\n"); 1432 goto out; 1433 } 1434 1435 if (is_single_hop_neigh) { 1436 hardif_neigh = batadv_hardif_neigh_get(if_incoming, 1437 ethhdr->h_source); 1438 if (hardif_neigh) 1439 hardif_neigh->last_seen = jiffies; 1440 } 1441 1442 router = batadv_orig_router_get(orig_node, if_outgoing); 1443 if (router) { 1444 router_router = batadv_orig_router_get(router->orig_node, 1445 if_outgoing); 1446 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); 1447 } 1448 1449 if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) && 1450 (batadv_compare_eth(router->addr, ethhdr->h_source))) 1451 is_from_best_next_hop = true; 1452 1453 prev_sender = ogm_packet->prev_sender; 1454 /* avoid temporary routing loops */ 1455 if (router && router_router && 1456 (batadv_compare_eth(router->addr, prev_sender)) && 1457 !(batadv_compare_eth(ogm_packet->orig, prev_sender)) && 1458 (batadv_compare_eth(router->addr, router_router->addr))) { 1459 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1460 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", 1461 ethhdr->h_source); 1462 goto out; 1463 } 1464 1465 if (if_outgoing == BATADV_IF_DEFAULT) 1466 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node); 1467 1468 /* if sender is a direct neighbor the sender mac equals 1469 * originator mac 1470 */ 1471 if (is_single_hop_neigh) 1472 orig_neigh_node = orig_node; 1473 else 1474 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, 1475 ethhdr->h_source); 1476 1477 if (!orig_neigh_node) 1478 goto out; 1479 1480 /* Update nc_nodes of the originator */ 1481 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, 1482 ogm_packet, is_single_hop_neigh); 1483 1484 orig_neigh_router = batadv_orig_router_get(orig_neigh_node, 1485 if_outgoing); 1486 1487 /* drop packet if sender is not a direct neighbor and if we 1488 * don't route towards it 1489 */ 1490 if (!is_single_hop_neigh && (!orig_neigh_router)) { 1491 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1492 "Drop packet: OGM via unknown neighbor!\n"); 1493 goto out_neigh; 1494 } 1495 1496 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, 1497 ogm_packet, if_incoming, 1498 if_outgoing); 1499 1500 /* update ranking if it is not a duplicate or has the same 1501 * seqno and similar ttl as the non-duplicate 1502 */ 1503 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); 1504 if (!orig_ifinfo) 1505 goto out_neigh; 1506 1507 sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno); 1508 similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl; 1509 1510 if (is_bidirect && ((dup_status == BATADV_NO_DUP) || 1511 (sameseq && similar_ttl))) { 1512 batadv_iv_ogm_orig_update(bat_priv, orig_node, 1513 orig_ifinfo, ethhdr, 1514 ogm_packet, if_incoming, 1515 if_outgoing, dup_status); 1516 } 1517 batadv_orig_ifinfo_put(orig_ifinfo); 1518 1519 /* only forward for specific interface, not for the default one. */ 1520 if (if_outgoing == BATADV_IF_DEFAULT) 1521 goto out_neigh; 1522 1523 /* is single hop (direct) neighbor */ 1524 if (is_single_hop_neigh) { 1525 /* OGMs from secondary interfaces should only scheduled once 1526 * per interface where it has been received, not multiple times 1527 */ 1528 if ((ogm_packet->ttl <= 2) && 1529 (if_incoming != if_outgoing)) { 1530 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1531 "Drop packet: OGM from secondary interface and wrong outgoing interface\n"); 1532 goto out_neigh; 1533 } 1534 /* mark direct link on incoming interface */ 1535 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, 1536 is_single_hop_neigh, 1537 is_from_best_next_hop, if_incoming, 1538 if_outgoing); 1539 1540 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1541 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); 1542 goto out_neigh; 1543 } 1544 1545 /* multihop originator */ 1546 if (!is_bidirect) { 1547 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1548 "Drop packet: not received via bidirectional link\n"); 1549 goto out_neigh; 1550 } 1551 1552 if (dup_status == BATADV_NEIGH_DUP) { 1553 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1554 "Drop packet: duplicate packet received\n"); 1555 goto out_neigh; 1556 } 1557 1558 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1559 "Forwarding packet: rebroadcast originator packet\n"); 1560 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, 1561 is_single_hop_neigh, is_from_best_next_hop, 1562 if_incoming, if_outgoing); 1563 1564 out_neigh: 1565 if ((orig_neigh_node) && (!is_single_hop_neigh)) 1566 batadv_orig_node_put(orig_neigh_node); 1567 out: 1568 if (router_ifinfo) 1569 batadv_neigh_ifinfo_put(router_ifinfo); 1570 if (router) 1571 batadv_neigh_node_put(router); 1572 if (router_router) 1573 batadv_neigh_node_put(router_router); 1574 if (orig_neigh_router) 1575 batadv_neigh_node_put(orig_neigh_router); 1576 if (hardif_neigh) 1577 batadv_hardif_neigh_put(hardif_neigh); 1578 1579 kfree_skb(skb_priv); 1580 } 1581 1582 /** 1583 * batadv_iv_ogm_process - process an incoming batman iv OGM 1584 * @skb: the skb containing the OGM 1585 * @ogm_offset: offset to the OGM which should be processed (for aggregates) 1586 * @if_incoming: the interface where this packet was receved 1587 */ 1588 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, 1589 struct batadv_hard_iface *if_incoming) 1590 { 1591 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1592 struct batadv_orig_node *orig_neigh_node, *orig_node; 1593 struct batadv_hard_iface *hard_iface; 1594 struct batadv_ogm_packet *ogm_packet; 1595 u32 if_incoming_seqno; 1596 bool has_directlink_flag; 1597 struct ethhdr *ethhdr; 1598 bool is_my_oldorig = false; 1599 bool is_my_addr = false; 1600 bool is_my_orig = false; 1601 1602 ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset); 1603 ethhdr = eth_hdr(skb); 1604 1605 /* Silently drop when the batman packet is actually not a 1606 * correct packet. 1607 * 1608 * This might happen if a packet is padded (e.g. Ethernet has a 1609 * minimum frame length of 64 byte) and the aggregation interprets 1610 * it as an additional length. 1611 * 1612 * TODO: A more sane solution would be to have a bit in the 1613 * batadv_ogm_packet to detect whether the packet is the last 1614 * packet in an aggregation. Here we expect that the padding 1615 * is always zero (or not 0x01) 1616 */ 1617 if (ogm_packet->packet_type != BATADV_IV_OGM) 1618 return; 1619 1620 /* could be changed by schedule_own_packet() */ 1621 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); 1622 1623 if (ogm_packet->flags & BATADV_DIRECTLINK) 1624 has_directlink_flag = true; 1625 else 1626 has_directlink_flag = false; 1627 1628 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1629 "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", 1630 ethhdr->h_source, if_incoming->net_dev->name, 1631 if_incoming->net_dev->dev_addr, ogm_packet->orig, 1632 ogm_packet->prev_sender, ntohl(ogm_packet->seqno), 1633 ogm_packet->tq, ogm_packet->ttl, 1634 ogm_packet->version, has_directlink_flag); 1635 1636 rcu_read_lock(); 1637 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 1638 if (hard_iface->if_status != BATADV_IF_ACTIVE) 1639 continue; 1640 1641 if (hard_iface->soft_iface != if_incoming->soft_iface) 1642 continue; 1643 1644 if (batadv_compare_eth(ethhdr->h_source, 1645 hard_iface->net_dev->dev_addr)) 1646 is_my_addr = true; 1647 1648 if (batadv_compare_eth(ogm_packet->orig, 1649 hard_iface->net_dev->dev_addr)) 1650 is_my_orig = true; 1651 1652 if (batadv_compare_eth(ogm_packet->prev_sender, 1653 hard_iface->net_dev->dev_addr)) 1654 is_my_oldorig = true; 1655 } 1656 rcu_read_unlock(); 1657 1658 if (is_my_addr) { 1659 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1660 "Drop packet: received my own broadcast (sender: %pM)\n", 1661 ethhdr->h_source); 1662 return; 1663 } 1664 1665 if (is_my_orig) { 1666 unsigned long *word; 1667 int offset; 1668 s32 bit_pos; 1669 s16 if_num; 1670 u8 *weight; 1671 1672 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, 1673 ethhdr->h_source); 1674 if (!orig_neigh_node) 1675 return; 1676 1677 /* neighbor has to indicate direct link and it has to 1678 * come via the corresponding interface 1679 * save packet seqno for bidirectional check 1680 */ 1681 if (has_directlink_flag && 1682 batadv_compare_eth(if_incoming->net_dev->dev_addr, 1683 ogm_packet->orig)) { 1684 if_num = if_incoming->if_num; 1685 offset = if_num * BATADV_NUM_WORDS; 1686 1687 spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); 1688 word = &orig_neigh_node->bat_iv.bcast_own[offset]; 1689 bit_pos = if_incoming_seqno - 2; 1690 bit_pos -= ntohl(ogm_packet->seqno); 1691 batadv_set_bit(word, bit_pos); 1692 weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num]; 1693 *weight = bitmap_weight(word, 1694 BATADV_TQ_LOCAL_WINDOW_SIZE); 1695 spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); 1696 } 1697 1698 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1699 "Drop packet: originator packet from myself (via neighbor)\n"); 1700 batadv_orig_node_put(orig_neigh_node); 1701 return; 1702 } 1703 1704 if (is_my_oldorig) { 1705 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1706 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", 1707 ethhdr->h_source); 1708 return; 1709 } 1710 1711 if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { 1712 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1713 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", 1714 ethhdr->h_source); 1715 return; 1716 } 1717 1718 orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig); 1719 if (!orig_node) 1720 return; 1721 1722 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, 1723 if_incoming, BATADV_IF_DEFAULT); 1724 1725 rcu_read_lock(); 1726 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 1727 if (hard_iface->if_status != BATADV_IF_ACTIVE) 1728 continue; 1729 1730 if (hard_iface->soft_iface != bat_priv->soft_iface) 1731 continue; 1732 1733 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, 1734 if_incoming, hard_iface); 1735 } 1736 rcu_read_unlock(); 1737 1738 batadv_orig_node_put(orig_node); 1739 } 1740 1741 static int batadv_iv_ogm_receive(struct sk_buff *skb, 1742 struct batadv_hard_iface *if_incoming) 1743 { 1744 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1745 struct batadv_ogm_packet *ogm_packet; 1746 u8 *packet_pos; 1747 int ogm_offset; 1748 bool ret; 1749 1750 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); 1751 if (!ret) 1752 return NET_RX_DROP; 1753 1754 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface 1755 * that does not have B.A.T.M.A.N. IV enabled ? 1756 */ 1757 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) 1758 return NET_RX_DROP; 1759 1760 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); 1761 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, 1762 skb->len + ETH_HLEN); 1763 1764 ogm_offset = 0; 1765 ogm_packet = (struct batadv_ogm_packet *)skb->data; 1766 1767 /* unpack the aggregated packets and process them one by one */ 1768 while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb), 1769 ogm_packet->tvlv_len)) { 1770 batadv_iv_ogm_process(skb, ogm_offset, if_incoming); 1771 1772 ogm_offset += BATADV_OGM_HLEN; 1773 ogm_offset += ntohs(ogm_packet->tvlv_len); 1774 1775 packet_pos = skb->data + ogm_offset; 1776 ogm_packet = (struct batadv_ogm_packet *)packet_pos; 1777 } 1778 1779 kfree_skb(skb); 1780 return NET_RX_SUCCESS; 1781 } 1782 1783 /** 1784 * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table 1785 * @orig_node: the orig_node for which the neighbors are printed 1786 * @if_outgoing: outgoing interface for these entries 1787 * @seq: debugfs table seq_file struct 1788 * 1789 * Must be called while holding an rcu lock. 1790 */ 1791 static void 1792 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node, 1793 struct batadv_hard_iface *if_outgoing, 1794 struct seq_file *seq) 1795 { 1796 struct batadv_neigh_node *neigh_node; 1797 struct batadv_neigh_ifinfo *n_ifinfo; 1798 1799 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { 1800 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); 1801 if (!n_ifinfo) 1802 continue; 1803 1804 seq_printf(seq, " %pM (%3i)", 1805 neigh_node->addr, 1806 n_ifinfo->bat_iv.tq_avg); 1807 1808 batadv_neigh_ifinfo_put(n_ifinfo); 1809 } 1810 } 1811 1812 /** 1813 * batadv_iv_ogm_orig_print - print the originator table 1814 * @bat_priv: the bat priv with all the soft interface information 1815 * @seq: debugfs table seq_file struct 1816 * @if_outgoing: the outgoing interface for which this should be printed 1817 */ 1818 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, 1819 struct seq_file *seq, 1820 struct batadv_hard_iface *if_outgoing) 1821 { 1822 struct batadv_neigh_node *neigh_node; 1823 struct batadv_hashtable *hash = bat_priv->orig_hash; 1824 int last_seen_msecs, last_seen_secs; 1825 struct batadv_orig_node *orig_node; 1826 struct batadv_neigh_ifinfo *n_ifinfo; 1827 unsigned long last_seen_jiffies; 1828 struct hlist_head *head; 1829 int batman_count = 0; 1830 u32 i; 1831 1832 seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n", 1833 "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE, 1834 "Nexthop", "outgoingIF", "Potential nexthops"); 1835 1836 for (i = 0; i < hash->size; i++) { 1837 head = &hash->table[i]; 1838 1839 rcu_read_lock(); 1840 hlist_for_each_entry_rcu(orig_node, head, hash_entry) { 1841 neigh_node = batadv_orig_router_get(orig_node, 1842 if_outgoing); 1843 if (!neigh_node) 1844 continue; 1845 1846 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, 1847 if_outgoing); 1848 if (!n_ifinfo) 1849 goto next; 1850 1851 if (n_ifinfo->bat_iv.tq_avg == 0) 1852 goto next; 1853 1854 last_seen_jiffies = jiffies - orig_node->last_seen; 1855 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); 1856 last_seen_secs = last_seen_msecs / 1000; 1857 last_seen_msecs = last_seen_msecs % 1000; 1858 1859 seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", 1860 orig_node->orig, last_seen_secs, 1861 last_seen_msecs, n_ifinfo->bat_iv.tq_avg, 1862 neigh_node->addr, 1863 neigh_node->if_incoming->net_dev->name); 1864 1865 batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing, 1866 seq); 1867 seq_puts(seq, "\n"); 1868 batman_count++; 1869 1870 next: 1871 batadv_neigh_node_put(neigh_node); 1872 if (n_ifinfo) 1873 batadv_neigh_ifinfo_put(n_ifinfo); 1874 } 1875 rcu_read_unlock(); 1876 } 1877 1878 if (batman_count == 0) 1879 seq_puts(seq, "No batman nodes in range ...\n"); 1880 } 1881 1882 /** 1883 * batadv_iv_hardif_neigh_print - print a single hop neighbour node 1884 * @seq: neighbour table seq_file struct 1885 * @hardif_neigh: hardif neighbour information 1886 */ 1887 static void 1888 batadv_iv_hardif_neigh_print(struct seq_file *seq, 1889 struct batadv_hardif_neigh_node *hardif_neigh) 1890 { 1891 int last_secs, last_msecs; 1892 1893 last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000; 1894 last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000; 1895 1896 seq_printf(seq, " %10s %pM %4i.%03is\n", 1897 hardif_neigh->if_incoming->net_dev->name, 1898 hardif_neigh->addr, last_secs, last_msecs); 1899 } 1900 1901 /** 1902 * batadv_iv_ogm_neigh_print - print the single hop neighbour list 1903 * @bat_priv: the bat priv with all the soft interface information 1904 * @seq: neighbour table seq_file struct 1905 */ 1906 static void batadv_iv_neigh_print(struct batadv_priv *bat_priv, 1907 struct seq_file *seq) 1908 { 1909 struct net_device *net_dev = (struct net_device *)seq->private; 1910 struct batadv_hardif_neigh_node *hardif_neigh; 1911 struct batadv_hard_iface *hard_iface; 1912 int batman_count = 0; 1913 1914 seq_printf(seq, " %10s %-13s %s\n", 1915 "IF", "Neighbor", "last-seen"); 1916 1917 rcu_read_lock(); 1918 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 1919 if (hard_iface->soft_iface != net_dev) 1920 continue; 1921 1922 hlist_for_each_entry_rcu(hardif_neigh, 1923 &hard_iface->neigh_list, list) { 1924 batadv_iv_hardif_neigh_print(seq, hardif_neigh); 1925 batman_count++; 1926 } 1927 } 1928 rcu_read_unlock(); 1929 1930 if (batman_count == 0) 1931 seq_puts(seq, "No batman nodes in range ...\n"); 1932 } 1933 1934 /** 1935 * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors 1936 * @neigh1: the first neighbor object of the comparison 1937 * @if_outgoing1: outgoing interface for the first neighbor 1938 * @neigh2: the second neighbor object of the comparison 1939 * @if_outgoing2: outgoing interface for the second neighbor 1940 * 1941 * Return: a value less, equal to or greater than 0 if the metric via neigh1 is 1942 * lower, the same as or higher than the metric via neigh2 1943 */ 1944 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, 1945 struct batadv_hard_iface *if_outgoing1, 1946 struct batadv_neigh_node *neigh2, 1947 struct batadv_hard_iface *if_outgoing2) 1948 { 1949 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; 1950 u8 tq1, tq2; 1951 int diff; 1952 1953 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); 1954 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); 1955 1956 if (!neigh1_ifinfo || !neigh2_ifinfo) { 1957 diff = 0; 1958 goto out; 1959 } 1960 1961 tq1 = neigh1_ifinfo->bat_iv.tq_avg; 1962 tq2 = neigh2_ifinfo->bat_iv.tq_avg; 1963 diff = tq1 - tq2; 1964 1965 out: 1966 if (neigh1_ifinfo) 1967 batadv_neigh_ifinfo_put(neigh1_ifinfo); 1968 if (neigh2_ifinfo) 1969 batadv_neigh_ifinfo_put(neigh2_ifinfo); 1970 1971 return diff; 1972 } 1973 1974 /** 1975 * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better 1976 * than neigh2 from the metric prospective 1977 * @neigh1: the first neighbor object of the comparison 1978 * @if_outgoing1: outgoing interface for the first neighbor 1979 * @neigh2: the second neighbor object of the comparison 1980 * @if_outgoing2: outgoing interface for the second neighbor 1981 * 1982 * Return: true if the metric via neigh1 is equally good or better than 1983 * the metric via neigh2, false otherwise. 1984 */ 1985 static bool 1986 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1, 1987 struct batadv_hard_iface *if_outgoing1, 1988 struct batadv_neigh_node *neigh2, 1989 struct batadv_hard_iface *if_outgoing2) 1990 { 1991 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; 1992 u8 tq1, tq2; 1993 bool ret; 1994 1995 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); 1996 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); 1997 1998 /* we can't say that the metric is better */ 1999 if (!neigh1_ifinfo || !neigh2_ifinfo) { 2000 ret = false; 2001 goto out; 2002 } 2003 2004 tq1 = neigh1_ifinfo->bat_iv.tq_avg; 2005 tq2 = neigh2_ifinfo->bat_iv.tq_avg; 2006 ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD; 2007 2008 out: 2009 if (neigh1_ifinfo) 2010 batadv_neigh_ifinfo_put(neigh1_ifinfo); 2011 if (neigh2_ifinfo) 2012 batadv_neigh_ifinfo_put(neigh2_ifinfo); 2013 2014 return ret; 2015 } 2016 2017 static struct batadv_algo_ops batadv_batman_iv __read_mostly = { 2018 .name = "BATMAN_IV", 2019 .bat_iface_enable = batadv_iv_ogm_iface_enable, 2020 .bat_iface_disable = batadv_iv_ogm_iface_disable, 2021 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, 2022 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, 2023 .bat_ogm_schedule = batadv_iv_ogm_schedule, 2024 .bat_ogm_emit = batadv_iv_ogm_emit, 2025 .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp, 2026 .bat_neigh_is_similar_or_better = batadv_iv_ogm_neigh_is_sob, 2027 .bat_neigh_print = batadv_iv_neigh_print, 2028 .bat_orig_print = batadv_iv_ogm_orig_print, 2029 .bat_orig_free = batadv_iv_ogm_orig_free, 2030 .bat_orig_add_if = batadv_iv_ogm_orig_add_if, 2031 .bat_orig_del_if = batadv_iv_ogm_orig_del_if, 2032 }; 2033 2034 int __init batadv_iv_init(void) 2035 { 2036 int ret; 2037 2038 /* batman originator packet */ 2039 ret = batadv_recv_handler_register(BATADV_IV_OGM, 2040 batadv_iv_ogm_receive); 2041 if (ret < 0) 2042 goto out; 2043 2044 ret = batadv_algo_register(&batadv_batman_iv); 2045 if (ret < 0) 2046 goto handler_unregister; 2047 2048 goto out; 2049 2050 handler_unregister: 2051 batadv_recv_handler_unregister(BATADV_IV_OGM); 2052 out: 2053 return ret; 2054 } 2055