1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) 2007-2018 B.A.T.M.A.N. contributors: 3 * 4 * Marek Lindner, Simon Wunderlich 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of version 2 of the GNU General Public 8 * License as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "bat_iv_ogm.h" 20 #include "main.h" 21 22 #include <linux/atomic.h> 23 #include <linux/bitmap.h> 24 #include <linux/bitops.h> 25 #include <linux/bug.h> 26 #include <linux/byteorder/generic.h> 27 #include <linux/cache.h> 28 #include <linux/errno.h> 29 #include <linux/etherdevice.h> 30 #include <linux/gfp.h> 31 #include <linux/if_ether.h> 32 #include <linux/init.h> 33 #include <linux/jiffies.h> 34 #include <linux/kernel.h> 35 #include <linux/kref.h> 36 #include <linux/list.h> 37 #include <linux/lockdep.h> 38 #include <linux/netdevice.h> 39 #include <linux/netlink.h> 40 #include <linux/pkt_sched.h> 41 #include <linux/printk.h> 42 #include <linux/random.h> 43 #include <linux/rculist.h> 44 #include <linux/rcupdate.h> 45 #include <linux/seq_file.h> 46 #include <linux/skbuff.h> 47 #include <linux/slab.h> 48 #include <linux/spinlock.h> 49 #include <linux/stddef.h> 50 #include <linux/string.h> 51 #include <linux/types.h> 52 #include <linux/workqueue.h> 53 #include <net/genetlink.h> 54 #include <net/netlink.h> 55 #include <uapi/linux/batadv_packet.h> 56 #include <uapi/linux/batman_adv.h> 57 58 #include "bat_algo.h" 59 #include "bitarray.h" 60 #include "gateway_client.h" 61 #include "hard-interface.h" 62 #include "hash.h" 63 #include "log.h" 64 #include "netlink.h" 65 #include "network-coding.h" 66 #include "originator.h" 67 #include "routing.h" 68 #include "send.h" 69 #include "translation-table.h" 70 #include "tvlv.h" 71 72 static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work); 73 74 /** 75 * enum batadv_dup_status - duplicate status 76 */ 77 enum batadv_dup_status { 78 /** @BATADV_NO_DUP: the packet is no duplicate */ 79 BATADV_NO_DUP = 0, 80 81 /** 82 * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for 83 * the neighbor) 84 */ 85 BATADV_ORIG_DUP, 86 87 /** @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor */ 88 BATADV_NEIGH_DUP, 89 90 /** 91 * @BATADV_PROTECTED: originator is currently protected (after reboot) 92 */ 93 BATADV_PROTECTED, 94 }; 95 96 /** 97 * batadv_ring_buffer_set() - update the ring buffer with the given value 98 * @lq_recv: pointer to the ring buffer 99 * @lq_index: index to store the value at 100 * @value: value to store in the ring buffer 101 */ 102 static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value) 103 { 104 lq_recv[*lq_index] = value; 105 *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; 106 } 107 108 /** 109 * batadv_ring_buffer_avg() - compute the average of all non-zero values stored 110 * in the given ring buffer 111 * @lq_recv: pointer to the ring buffer 112 * 113 * Return: computed average value. 114 */ 115 static u8 batadv_ring_buffer_avg(const u8 lq_recv[]) 116 { 117 const u8 *ptr; 118 u16 count = 0; 119 u16 i = 0; 120 u16 sum = 0; 121 122 ptr = lq_recv; 123 124 while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { 125 if (*ptr != 0) { 126 count++; 127 sum += *ptr; 128 } 129 130 i++; 131 ptr++; 132 } 133 134 if (count == 0) 135 return 0; 136 137 return (u8)(sum / count); 138 } 139 140 /** 141 * batadv_iv_ogm_orig_free() - free the private resources allocated for this 142 * orig_node 143 * @orig_node: the orig_node for which the resources have to be free'd 144 */ 145 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node) 146 { 147 kfree(orig_node->bat_iv.bcast_own); 148 kfree(orig_node->bat_iv.bcast_own_sum); 149 } 150 151 /** 152 * batadv_iv_ogm_orig_add_if() - change the private structures of the orig_node 153 * to include the new hard-interface 154 * @orig_node: the orig_node that has to be changed 155 * @max_if_num: the current amount of interfaces 156 * 157 * Return: 0 on success, a negative error code otherwise. 158 */ 159 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, 160 unsigned int max_if_num) 161 { 162 void *data_ptr; 163 size_t old_size; 164 int ret = -ENOMEM; 165 166 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 167 168 old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS; 169 data_ptr = kmalloc_array(max_if_num, 170 BATADV_NUM_WORDS * sizeof(unsigned long), 171 GFP_ATOMIC); 172 if (!data_ptr) 173 goto unlock; 174 175 memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size); 176 kfree(orig_node->bat_iv.bcast_own); 177 orig_node->bat_iv.bcast_own = data_ptr; 178 179 data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC); 180 if (!data_ptr) 181 goto unlock; 182 183 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, 184 (max_if_num - 1) * sizeof(u8)); 185 kfree(orig_node->bat_iv.bcast_own_sum); 186 orig_node->bat_iv.bcast_own_sum = data_ptr; 187 188 ret = 0; 189 190 unlock: 191 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 192 193 return ret; 194 } 195 196 /** 197 * batadv_iv_ogm_drop_bcast_own_entry() - drop section of bcast_own 198 * @orig_node: the orig_node that has to be changed 199 * @max_if_num: the current amount of interfaces 200 * @del_if_num: the index of the interface being removed 201 */ 202 static void 203 batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node, 204 unsigned int max_if_num, 205 unsigned int del_if_num) 206 { 207 size_t chunk_size; 208 size_t if_offset; 209 void *data_ptr; 210 211 lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock); 212 213 chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; 214 data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC); 215 if (!data_ptr) 216 /* use old buffer when new one could not be allocated */ 217 data_ptr = orig_node->bat_iv.bcast_own; 218 219 /* copy first part */ 220 memmove(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); 221 222 /* copy second part */ 223 if_offset = (del_if_num + 1) * chunk_size; 224 memmove((char *)data_ptr + del_if_num * chunk_size, 225 (uint8_t *)orig_node->bat_iv.bcast_own + if_offset, 226 (max_if_num - del_if_num) * chunk_size); 227 228 /* bcast_own was shrunk down in new buffer; free old one */ 229 if (orig_node->bat_iv.bcast_own != data_ptr) { 230 kfree(orig_node->bat_iv.bcast_own); 231 orig_node->bat_iv.bcast_own = data_ptr; 232 } 233 } 234 235 /** 236 * batadv_iv_ogm_drop_bcast_own_sum_entry() - drop section of bcast_own_sum 237 * @orig_node: the orig_node that has to be changed 238 * @max_if_num: the current amount of interfaces 239 * @del_if_num: the index of the interface being removed 240 */ 241 static void 242 batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node, 243 unsigned int max_if_num, 244 unsigned int del_if_num) 245 { 246 size_t if_offset; 247 void *data_ptr; 248 249 lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock); 250 251 data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC); 252 if (!data_ptr) 253 /* use old buffer when new one could not be allocated */ 254 data_ptr = orig_node->bat_iv.bcast_own_sum; 255 256 memmove(data_ptr, orig_node->bat_iv.bcast_own_sum, 257 del_if_num * sizeof(u8)); 258 259 if_offset = (del_if_num + 1) * sizeof(u8); 260 memmove((char *)data_ptr + del_if_num * sizeof(u8), 261 orig_node->bat_iv.bcast_own_sum + if_offset, 262 (max_if_num - del_if_num) * sizeof(u8)); 263 264 /* bcast_own_sum was shrunk down in new buffer; free old one */ 265 if (orig_node->bat_iv.bcast_own_sum != data_ptr) { 266 kfree(orig_node->bat_iv.bcast_own_sum); 267 orig_node->bat_iv.bcast_own_sum = data_ptr; 268 } 269 } 270 271 /** 272 * batadv_iv_ogm_orig_del_if() - change the private structures of the orig_node 273 * to exclude the removed interface 274 * @orig_node: the orig_node that has to be changed 275 * @max_if_num: the current amount of interfaces 276 * @del_if_num: the index of the interface being removed 277 * 278 * Return: 0 on success, a negative error code otherwise. 279 */ 280 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, 281 unsigned int max_if_num, 282 unsigned int del_if_num) 283 { 284 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 285 286 if (max_if_num == 0) { 287 kfree(orig_node->bat_iv.bcast_own); 288 kfree(orig_node->bat_iv.bcast_own_sum); 289 orig_node->bat_iv.bcast_own = NULL; 290 orig_node->bat_iv.bcast_own_sum = NULL; 291 } else { 292 batadv_iv_ogm_drop_bcast_own_entry(orig_node, max_if_num, 293 del_if_num); 294 batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node, max_if_num, 295 del_if_num); 296 } 297 298 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 299 300 return 0; 301 } 302 303 /** 304 * batadv_iv_ogm_orig_get() - retrieve or create (if does not exist) an 305 * originator 306 * @bat_priv: the bat priv with all the soft interface information 307 * @addr: mac address of the originator 308 * 309 * Return: the originator object corresponding to the passed mac address or NULL 310 * on failure. 311 * If the object does not exists it is created an initialised. 312 */ 313 static struct batadv_orig_node * 314 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr) 315 { 316 struct batadv_orig_node *orig_node; 317 int hash_added; 318 size_t size; 319 320 orig_node = batadv_orig_hash_find(bat_priv, addr); 321 if (orig_node) 322 return orig_node; 323 324 orig_node = batadv_orig_node_new(bat_priv, addr); 325 if (!orig_node) 326 return NULL; 327 328 spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock); 329 330 size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS; 331 orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC); 332 if (!orig_node->bat_iv.bcast_own) 333 goto free_orig_node; 334 335 size = bat_priv->num_ifaces * sizeof(u8); 336 orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC); 337 if (!orig_node->bat_iv.bcast_own_sum) 338 goto free_orig_node; 339 340 kref_get(&orig_node->refcount); 341 hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, 342 batadv_choose_orig, orig_node, 343 &orig_node->hash_entry); 344 if (hash_added != 0) 345 goto free_orig_node_hash; 346 347 return orig_node; 348 349 free_orig_node_hash: 350 batadv_orig_node_put(orig_node); 351 free_orig_node: 352 batadv_orig_node_put(orig_node); 353 354 return NULL; 355 } 356 357 static struct batadv_neigh_node * 358 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, 359 const u8 *neigh_addr, 360 struct batadv_orig_node *orig_node, 361 struct batadv_orig_node *orig_neigh) 362 { 363 struct batadv_neigh_node *neigh_node; 364 365 neigh_node = batadv_neigh_node_get_or_create(orig_node, 366 hard_iface, neigh_addr); 367 if (!neigh_node) 368 goto out; 369 370 neigh_node->orig_node = orig_neigh; 371 372 out: 373 return neigh_node; 374 } 375 376 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) 377 { 378 struct batadv_ogm_packet *batadv_ogm_packet; 379 unsigned char *ogm_buff; 380 u32 random_seqno; 381 382 /* randomize initial seqno to avoid collision */ 383 get_random_bytes(&random_seqno, sizeof(random_seqno)); 384 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); 385 386 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; 387 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); 388 if (!ogm_buff) 389 return -ENOMEM; 390 391 hard_iface->bat_iv.ogm_buff = ogm_buff; 392 393 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 394 batadv_ogm_packet->packet_type = BATADV_IV_OGM; 395 batadv_ogm_packet->version = BATADV_COMPAT_VERSION; 396 batadv_ogm_packet->ttl = 2; 397 batadv_ogm_packet->flags = BATADV_NO_FLAGS; 398 batadv_ogm_packet->reserved = 0; 399 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; 400 401 return 0; 402 } 403 404 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) 405 { 406 kfree(hard_iface->bat_iv.ogm_buff); 407 hard_iface->bat_iv.ogm_buff = NULL; 408 } 409 410 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) 411 { 412 struct batadv_ogm_packet *batadv_ogm_packet; 413 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; 414 415 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 416 ether_addr_copy(batadv_ogm_packet->orig, 417 hard_iface->net_dev->dev_addr); 418 ether_addr_copy(batadv_ogm_packet->prev_sender, 419 hard_iface->net_dev->dev_addr); 420 } 421 422 static void 423 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) 424 { 425 struct batadv_ogm_packet *batadv_ogm_packet; 426 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; 427 428 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; 429 batadv_ogm_packet->ttl = BATADV_TTL; 430 } 431 432 /* when do we schedule our own ogm to be sent */ 433 static unsigned long 434 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) 435 { 436 unsigned int msecs; 437 438 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; 439 msecs += prandom_u32() % (2 * BATADV_JITTER); 440 441 return jiffies + msecs_to_jiffies(msecs); 442 } 443 444 /* when do we schedule a ogm packet to be sent */ 445 static unsigned long batadv_iv_ogm_fwd_send_time(void) 446 { 447 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2)); 448 } 449 450 /* apply hop penalty for a normal link */ 451 static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv) 452 { 453 int hop_penalty = atomic_read(&bat_priv->hop_penalty); 454 int new_tq; 455 456 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); 457 new_tq /= BATADV_TQ_MAX_VALUE; 458 459 return new_tq; 460 } 461 462 /** 463 * batadv_iv_ogm_aggr_packet() - checks if there is another OGM attached 464 * @buff_pos: current position in the skb 465 * @packet_len: total length of the skb 466 * @tvlv_len: tvlv length of the previously considered OGM 467 * 468 * Return: true if there is enough space for another OGM, false otherwise. 469 */ 470 static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, 471 __be16 tvlv_len) 472 { 473 int next_buff_pos = 0; 474 475 next_buff_pos += buff_pos + BATADV_OGM_HLEN; 476 next_buff_pos += ntohs(tvlv_len); 477 478 return (next_buff_pos <= packet_len) && 479 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); 480 } 481 482 /* send a batman ogm to a given interface */ 483 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, 484 struct batadv_hard_iface *hard_iface) 485 { 486 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 487 const char *fwd_str; 488 u8 packet_num; 489 s16 buff_pos; 490 struct batadv_ogm_packet *batadv_ogm_packet; 491 struct sk_buff *skb; 492 u8 *packet_pos; 493 494 if (hard_iface->if_status != BATADV_IF_ACTIVE) 495 return; 496 497 packet_num = 0; 498 buff_pos = 0; 499 packet_pos = forw_packet->skb->data; 500 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 501 502 /* adjust all flags and log packets */ 503 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, 504 batadv_ogm_packet->tvlv_len)) { 505 /* we might have aggregated direct link packets with an 506 * ordinary base packet 507 */ 508 if (forw_packet->direct_link_flags & BIT(packet_num) && 509 forw_packet->if_incoming == hard_iface) 510 batadv_ogm_packet->flags |= BATADV_DIRECTLINK; 511 else 512 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; 513 514 if (packet_num > 0 || !forw_packet->own) 515 fwd_str = "Forwarding"; 516 else 517 fwd_str = "Sending own"; 518 519 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 520 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n", 521 fwd_str, (packet_num > 0 ? "aggregated " : ""), 522 batadv_ogm_packet->orig, 523 ntohl(batadv_ogm_packet->seqno), 524 batadv_ogm_packet->tq, batadv_ogm_packet->ttl, 525 ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ? 526 "on" : "off"), 527 hard_iface->net_dev->name, 528 hard_iface->net_dev->dev_addr); 529 530 buff_pos += BATADV_OGM_HLEN; 531 buff_pos += ntohs(batadv_ogm_packet->tvlv_len); 532 packet_num++; 533 packet_pos = forw_packet->skb->data + buff_pos; 534 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; 535 } 536 537 /* create clone because function is called more than once */ 538 skb = skb_clone(forw_packet->skb, GFP_ATOMIC); 539 if (skb) { 540 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); 541 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, 542 skb->len + ETH_HLEN); 543 batadv_send_broadcast_skb(skb, hard_iface); 544 } 545 } 546 547 /* send a batman ogm packet */ 548 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) 549 { 550 struct net_device *soft_iface; 551 552 if (!forw_packet->if_incoming) { 553 pr_err("Error - can't forward packet: incoming iface not specified\n"); 554 return; 555 } 556 557 soft_iface = forw_packet->if_incoming->soft_iface; 558 559 if (WARN_ON(!forw_packet->if_outgoing)) 560 return; 561 562 if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface)) 563 return; 564 565 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) 566 return; 567 568 /* only for one specific outgoing interface */ 569 batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing); 570 } 571 572 /** 573 * batadv_iv_ogm_can_aggregate() - find out if an OGM can be aggregated on an 574 * existing forward packet 575 * @new_bat_ogm_packet: OGM packet to be aggregated 576 * @bat_priv: the bat priv with all the soft interface information 577 * @packet_len: (total) length of the OGM 578 * @send_time: timestamp (jiffies) when the packet is to be sent 579 * @directlink: true if this is a direct link packet 580 * @if_incoming: interface where the packet was received 581 * @if_outgoing: interface for which the retransmission should be considered 582 * @forw_packet: the forwarded packet which should be checked 583 * 584 * Return: true if new_packet can be aggregated with forw_packet 585 */ 586 static bool 587 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, 588 struct batadv_priv *bat_priv, 589 int packet_len, unsigned long send_time, 590 bool directlink, 591 const struct batadv_hard_iface *if_incoming, 592 const struct batadv_hard_iface *if_outgoing, 593 const struct batadv_forw_packet *forw_packet) 594 { 595 struct batadv_ogm_packet *batadv_ogm_packet; 596 int aggregated_bytes = forw_packet->packet_len + packet_len; 597 struct batadv_hard_iface *primary_if = NULL; 598 bool res = false; 599 unsigned long aggregation_end_time; 600 601 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; 602 aggregation_end_time = send_time; 603 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); 604 605 /* we can aggregate the current packet to this aggregated packet 606 * if: 607 * 608 * - the send time is within our MAX_AGGREGATION_MS time 609 * - the resulting packet wont be bigger than 610 * MAX_AGGREGATION_BYTES 611 * otherwise aggregation is not possible 612 */ 613 if (!time_before(send_time, forw_packet->send_time) || 614 !time_after_eq(aggregation_end_time, forw_packet->send_time)) 615 return false; 616 617 if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES) 618 return false; 619 620 /* packet is not leaving on the same interface. */ 621 if (forw_packet->if_outgoing != if_outgoing) 622 return false; 623 624 /* check aggregation compatibility 625 * -> direct link packets are broadcasted on 626 * their interface only 627 * -> aggregate packet if the current packet is 628 * a "global" packet as well as the base 629 * packet 630 */ 631 primary_if = batadv_primary_if_get_selected(bat_priv); 632 if (!primary_if) 633 return false; 634 635 /* packets without direct link flag and high TTL 636 * are flooded through the net 637 */ 638 if (!directlink && 639 !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) && 640 batadv_ogm_packet->ttl != 1 && 641 642 /* own packets originating non-primary 643 * interfaces leave only that interface 644 */ 645 (!forw_packet->own || 646 forw_packet->if_incoming == primary_if)) { 647 res = true; 648 goto out; 649 } 650 651 /* if the incoming packet is sent via this one 652 * interface only - we still can aggregate 653 */ 654 if (directlink && 655 new_bat_ogm_packet->ttl == 1 && 656 forw_packet->if_incoming == if_incoming && 657 658 /* packets from direct neighbors or 659 * own secondary interface packets 660 * (= secondary interface packets in general) 661 */ 662 (batadv_ogm_packet->flags & BATADV_DIRECTLINK || 663 (forw_packet->own && 664 forw_packet->if_incoming != primary_if))) { 665 res = true; 666 goto out; 667 } 668 669 out: 670 if (primary_if) 671 batadv_hardif_put(primary_if); 672 return res; 673 } 674 675 /** 676 * batadv_iv_ogm_aggregate_new() - create a new aggregated packet and add this 677 * packet to it. 678 * @packet_buff: pointer to the OGM 679 * @packet_len: (total) length of the OGM 680 * @send_time: timestamp (jiffies) when the packet is to be sent 681 * @direct_link: whether this OGM has direct link status 682 * @if_incoming: interface where the packet was received 683 * @if_outgoing: interface for which the retransmission should be considered 684 * @own_packet: true if it is a self-generated ogm 685 */ 686 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, 687 int packet_len, unsigned long send_time, 688 bool direct_link, 689 struct batadv_hard_iface *if_incoming, 690 struct batadv_hard_iface *if_outgoing, 691 int own_packet) 692 { 693 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 694 struct batadv_forw_packet *forw_packet_aggr; 695 struct sk_buff *skb; 696 unsigned char *skb_buff; 697 unsigned int skb_size; 698 atomic_t *queue_left = own_packet ? NULL : &bat_priv->batman_queue_left; 699 700 if (atomic_read(&bat_priv->aggregated_ogms) && 701 packet_len < BATADV_MAX_AGGREGATION_BYTES) 702 skb_size = BATADV_MAX_AGGREGATION_BYTES; 703 else 704 skb_size = packet_len; 705 706 skb_size += ETH_HLEN; 707 708 skb = netdev_alloc_skb_ip_align(NULL, skb_size); 709 if (!skb) 710 return; 711 712 forw_packet_aggr = batadv_forw_packet_alloc(if_incoming, if_outgoing, 713 queue_left, bat_priv, skb); 714 if (!forw_packet_aggr) { 715 kfree_skb(skb); 716 return; 717 } 718 719 forw_packet_aggr->skb->priority = TC_PRIO_CONTROL; 720 skb_reserve(forw_packet_aggr->skb, ETH_HLEN); 721 722 skb_buff = skb_put(forw_packet_aggr->skb, packet_len); 723 forw_packet_aggr->packet_len = packet_len; 724 memcpy(skb_buff, packet_buff, packet_len); 725 726 forw_packet_aggr->own = own_packet; 727 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; 728 forw_packet_aggr->send_time = send_time; 729 730 /* save packet direct link flag status */ 731 if (direct_link) 732 forw_packet_aggr->direct_link_flags |= 1; 733 734 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, 735 batadv_iv_send_outstanding_bat_ogm_packet); 736 737 batadv_forw_packet_ogmv1_queue(bat_priv, forw_packet_aggr, send_time); 738 } 739 740 /* aggregate a new packet into the existing ogm packet */ 741 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, 742 const unsigned char *packet_buff, 743 int packet_len, bool direct_link) 744 { 745 unsigned long new_direct_link_flag; 746 747 skb_put_data(forw_packet_aggr->skb, 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 u16 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 if (is_single_hop_neigh) 874 batadv_ogm_packet->flags |= BATADV_DIRECTLINK; 875 else 876 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; 877 878 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, 879 BATADV_OGM_HLEN + tvlv_len, 880 if_incoming, if_outgoing, 0, 881 batadv_iv_ogm_fwd_send_time()); 882 } 883 884 /** 885 * batadv_iv_ogm_slide_own_bcast_window() - bitshift own OGM broadcast windows 886 * for the given interface 887 * @hard_iface: the interface for which the windows have to be shifted 888 */ 889 static void 890 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) 891 { 892 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 893 struct batadv_hashtable *hash = bat_priv->orig_hash; 894 struct hlist_head *head; 895 struct batadv_orig_node *orig_node; 896 unsigned long *word; 897 u32 i; 898 size_t word_index; 899 u8 *w; 900 unsigned int if_num; 901 902 for (i = 0; i < hash->size; i++) { 903 head = &hash->table[i]; 904 905 rcu_read_lock(); 906 hlist_for_each_entry_rcu(orig_node, head, hash_entry) { 907 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 908 word_index = hard_iface->if_num * BATADV_NUM_WORDS; 909 word = &orig_node->bat_iv.bcast_own[word_index]; 910 911 batadv_bit_get_packet(bat_priv, word, 1, 0); 912 if_num = hard_iface->if_num; 913 w = &orig_node->bat_iv.bcast_own_sum[if_num]; 914 *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); 915 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 916 } 917 rcu_read_unlock(); 918 } 919 } 920 921 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) 922 { 923 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); 924 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; 925 struct batadv_ogm_packet *batadv_ogm_packet; 926 struct batadv_hard_iface *primary_if, *tmp_hard_iface; 927 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; 928 u32 seqno; 929 u16 tvlv_len = 0; 930 unsigned long send_time; 931 932 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE || 933 hard_iface->if_status == BATADV_IF_TO_BE_REMOVED) 934 return; 935 936 /* the interface gets activated here to avoid race conditions between 937 * the moment of activating the interface in 938 * hardif_activate_interface() where the originator mac is set and 939 * outdated packets (especially uninitialized mac addresses) in the 940 * packet queue 941 */ 942 if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) 943 hard_iface->if_status = BATADV_IF_ACTIVE; 944 945 primary_if = batadv_primary_if_get_selected(bat_priv); 946 947 if (hard_iface == primary_if) { 948 /* tt changes have to be committed before the tvlv data is 949 * appended as it may alter the tt tvlv container 950 */ 951 batadv_tt_local_commit_changes(bat_priv); 952 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff, 953 ogm_buff_len, 954 BATADV_OGM_HLEN); 955 } 956 957 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); 958 batadv_ogm_packet->tvlv_len = htons(tvlv_len); 959 960 /* change sequence number to network order */ 961 seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno); 962 batadv_ogm_packet->seqno = htonl(seqno); 963 atomic_inc(&hard_iface->bat_iv.ogm_seqno); 964 965 batadv_iv_ogm_slide_own_bcast_window(hard_iface); 966 967 send_time = batadv_iv_ogm_emit_send_time(bat_priv); 968 969 if (hard_iface != primary_if) { 970 /* OGMs from secondary interfaces are only scheduled on their 971 * respective interfaces. 972 */ 973 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len, 974 hard_iface, hard_iface, 1, send_time); 975 goto out; 976 } 977 978 /* OGMs from primary interfaces are scheduled on all 979 * interfaces. 980 */ 981 rcu_read_lock(); 982 list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) { 983 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface) 984 continue; 985 986 if (!kref_get_unless_zero(&tmp_hard_iface->refcount)) 987 continue; 988 989 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, 990 *ogm_buff_len, hard_iface, 991 tmp_hard_iface, 1, send_time); 992 993 batadv_hardif_put(tmp_hard_iface); 994 } 995 rcu_read_unlock(); 996 997 out: 998 if (primary_if) 999 batadv_hardif_put(primary_if); 1000 } 1001 1002 /** 1003 * batadv_iv_ogm_orig_update() - use OGM to update corresponding data in an 1004 * originator 1005 * @bat_priv: the bat priv with all the soft interface information 1006 * @orig_node: the orig node who originally emitted the ogm packet 1007 * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node 1008 * @ethhdr: Ethernet header of the OGM 1009 * @batadv_ogm_packet: the ogm packet 1010 * @if_incoming: interface where the packet was received 1011 * @if_outgoing: interface for which the retransmission should be considered 1012 * @dup_status: the duplicate status of this ogm packet. 1013 */ 1014 static void 1015 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, 1016 struct batadv_orig_node *orig_node, 1017 struct batadv_orig_ifinfo *orig_ifinfo, 1018 const struct ethhdr *ethhdr, 1019 const struct batadv_ogm_packet *batadv_ogm_packet, 1020 struct batadv_hard_iface *if_incoming, 1021 struct batadv_hard_iface *if_outgoing, 1022 enum batadv_dup_status dup_status) 1023 { 1024 struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; 1025 struct batadv_neigh_ifinfo *router_ifinfo = NULL; 1026 struct batadv_neigh_node *neigh_node = NULL; 1027 struct batadv_neigh_node *tmp_neigh_node = NULL; 1028 struct batadv_neigh_node *router = NULL; 1029 struct batadv_orig_node *orig_node_tmp; 1030 unsigned int if_num; 1031 u8 sum_orig, sum_neigh; 1032 u8 *neigh_addr; 1033 u8 tq_avg; 1034 1035 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1036 "%s(): Searching and updating originator entry of received packet\n", 1037 __func__); 1038 1039 rcu_read_lock(); 1040 hlist_for_each_entry_rcu(tmp_neigh_node, 1041 &orig_node->neigh_list, list) { 1042 neigh_addr = tmp_neigh_node->addr; 1043 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && 1044 tmp_neigh_node->if_incoming == if_incoming && 1045 kref_get_unless_zero(&tmp_neigh_node->refcount)) { 1046 if (WARN(neigh_node, "too many matching neigh_nodes")) 1047 batadv_neigh_node_put(neigh_node); 1048 neigh_node = tmp_neigh_node; 1049 continue; 1050 } 1051 1052 if (dup_status != BATADV_NO_DUP) 1053 continue; 1054 1055 /* only update the entry for this outgoing interface */ 1056 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node, 1057 if_outgoing); 1058 if (!neigh_ifinfo) 1059 continue; 1060 1061 spin_lock_bh(&tmp_neigh_node->ifinfo_lock); 1062 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, 1063 &neigh_ifinfo->bat_iv.tq_index, 0); 1064 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); 1065 neigh_ifinfo->bat_iv.tq_avg = tq_avg; 1066 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock); 1067 1068 batadv_neigh_ifinfo_put(neigh_ifinfo); 1069 neigh_ifinfo = NULL; 1070 } 1071 1072 if (!neigh_node) { 1073 struct batadv_orig_node *orig_tmp; 1074 1075 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); 1076 if (!orig_tmp) 1077 goto unlock; 1078 1079 neigh_node = batadv_iv_ogm_neigh_new(if_incoming, 1080 ethhdr->h_source, 1081 orig_node, orig_tmp); 1082 1083 batadv_orig_node_put(orig_tmp); 1084 if (!neigh_node) 1085 goto unlock; 1086 } else { 1087 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1088 "Updating existing last-hop neighbor of originator\n"); 1089 } 1090 1091 rcu_read_unlock(); 1092 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); 1093 if (!neigh_ifinfo) 1094 goto out; 1095 1096 neigh_node->last_seen = jiffies; 1097 1098 spin_lock_bh(&neigh_node->ifinfo_lock); 1099 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, 1100 &neigh_ifinfo->bat_iv.tq_index, 1101 batadv_ogm_packet->tq); 1102 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); 1103 neigh_ifinfo->bat_iv.tq_avg = tq_avg; 1104 spin_unlock_bh(&neigh_node->ifinfo_lock); 1105 1106 if (dup_status == BATADV_NO_DUP) { 1107 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl; 1108 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl; 1109 } 1110 1111 /* if this neighbor already is our next hop there is nothing 1112 * to change 1113 */ 1114 router = batadv_orig_router_get(orig_node, if_outgoing); 1115 if (router == neigh_node) 1116 goto out; 1117 1118 if (router) { 1119 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); 1120 if (!router_ifinfo) 1121 goto out; 1122 1123 /* if this neighbor does not offer a better TQ we won't 1124 * consider it 1125 */ 1126 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg) 1127 goto out; 1128 } 1129 1130 /* if the TQ is the same and the link not more symmetric we 1131 * won't consider it either 1132 */ 1133 if (router_ifinfo && 1134 neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) { 1135 orig_node_tmp = router->orig_node; 1136 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1137 if_num = router->if_incoming->if_num; 1138 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; 1139 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1140 1141 orig_node_tmp = neigh_node->orig_node; 1142 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1143 if_num = neigh_node->if_incoming->if_num; 1144 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num]; 1145 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock); 1146 1147 if (sum_orig >= sum_neigh) 1148 goto out; 1149 } 1150 1151 batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); 1152 goto out; 1153 1154 unlock: 1155 rcu_read_unlock(); 1156 out: 1157 if (neigh_node) 1158 batadv_neigh_node_put(neigh_node); 1159 if (router) 1160 batadv_neigh_node_put(router); 1161 if (neigh_ifinfo) 1162 batadv_neigh_ifinfo_put(neigh_ifinfo); 1163 if (router_ifinfo) 1164 batadv_neigh_ifinfo_put(router_ifinfo); 1165 } 1166 1167 /** 1168 * batadv_iv_ogm_calc_tq() - calculate tq for current received ogm packet 1169 * @orig_node: the orig node who originally emitted the ogm packet 1170 * @orig_neigh_node: the orig node struct of the neighbor who sent the packet 1171 * @batadv_ogm_packet: the ogm packet 1172 * @if_incoming: interface where the packet was received 1173 * @if_outgoing: interface for which the retransmission should be considered 1174 * 1175 * Return: true if the link can be considered bidirectional, false otherwise 1176 */ 1177 static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, 1178 struct batadv_orig_node *orig_neigh_node, 1179 struct batadv_ogm_packet *batadv_ogm_packet, 1180 struct batadv_hard_iface *if_incoming, 1181 struct batadv_hard_iface *if_outgoing) 1182 { 1183 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1184 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; 1185 struct batadv_neigh_ifinfo *neigh_ifinfo; 1186 u8 total_count; 1187 u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; 1188 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; 1189 unsigned int if_num; 1190 unsigned int tq_asym_penalty, inv_asym_penalty; 1191 unsigned int combined_tq; 1192 unsigned int tq_iface_penalty; 1193 bool ret = false; 1194 1195 /* find corresponding one hop neighbor */ 1196 rcu_read_lock(); 1197 hlist_for_each_entry_rcu(tmp_neigh_node, 1198 &orig_neigh_node->neigh_list, list) { 1199 if (!batadv_compare_eth(tmp_neigh_node->addr, 1200 orig_neigh_node->orig)) 1201 continue; 1202 1203 if (tmp_neigh_node->if_incoming != if_incoming) 1204 continue; 1205 1206 if (!kref_get_unless_zero(&tmp_neigh_node->refcount)) 1207 continue; 1208 1209 neigh_node = tmp_neigh_node; 1210 break; 1211 } 1212 rcu_read_unlock(); 1213 1214 if (!neigh_node) 1215 neigh_node = batadv_iv_ogm_neigh_new(if_incoming, 1216 orig_neigh_node->orig, 1217 orig_neigh_node, 1218 orig_neigh_node); 1219 1220 if (!neigh_node) 1221 goto out; 1222 1223 /* if orig_node is direct neighbor update neigh_node last_seen */ 1224 if (orig_node == orig_neigh_node) 1225 neigh_node->last_seen = jiffies; 1226 1227 orig_node->last_seen = jiffies; 1228 1229 /* find packet count of corresponding one hop neighbor */ 1230 spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); 1231 if_num = if_incoming->if_num; 1232 orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num]; 1233 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); 1234 if (neigh_ifinfo) { 1235 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count; 1236 batadv_neigh_ifinfo_put(neigh_ifinfo); 1237 } else { 1238 neigh_rq_count = 0; 1239 } 1240 spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); 1241 1242 /* pay attention to not get a value bigger than 100 % */ 1243 if (orig_eq_count > neigh_rq_count) 1244 total_count = neigh_rq_count; 1245 else 1246 total_count = orig_eq_count; 1247 1248 /* if we have too few packets (too less data) we set tq_own to zero 1249 * if we receive too few packets it is not considered bidirectional 1250 */ 1251 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || 1252 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) 1253 tq_own = 0; 1254 else 1255 /* neigh_node->real_packet_count is never zero as we 1256 * only purge old information when getting new 1257 * information 1258 */ 1259 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; 1260 1261 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does 1262 * affect the nearly-symmetric links only a little, but 1263 * punishes asymmetric links more. This will give a value 1264 * between 0 and TQ_MAX_VALUE 1265 */ 1266 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; 1267 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; 1268 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * 1269 BATADV_TQ_LOCAL_WINDOW_SIZE * 1270 BATADV_TQ_LOCAL_WINDOW_SIZE; 1271 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; 1272 inv_asym_penalty /= neigh_rq_max_cube; 1273 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; 1274 1275 /* penalize if the OGM is forwarded on the same interface. WiFi 1276 * interfaces and other half duplex devices suffer from throughput 1277 * drops as they can't send and receive at the same time. 1278 */ 1279 tq_iface_penalty = BATADV_TQ_MAX_VALUE; 1280 if (if_outgoing && if_incoming == if_outgoing && 1281 batadv_is_wifi_hardif(if_outgoing)) 1282 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE, 1283 bat_priv); 1284 1285 combined_tq = batadv_ogm_packet->tq * 1286 tq_own * 1287 tq_asym_penalty * 1288 tq_iface_penalty; 1289 combined_tq /= BATADV_TQ_MAX_VALUE * 1290 BATADV_TQ_MAX_VALUE * 1291 BATADV_TQ_MAX_VALUE; 1292 batadv_ogm_packet->tq = combined_tq; 1293 1294 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1295 "bidirectional: orig = %pM neigh = %pM => 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", 1296 orig_node->orig, orig_neigh_node->orig, total_count, 1297 neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty, 1298 batadv_ogm_packet->tq, if_incoming->net_dev->name, 1299 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT"); 1300 1301 /* if link has the minimum required transmission quality 1302 * consider it bidirectional 1303 */ 1304 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) 1305 ret = true; 1306 1307 out: 1308 if (neigh_node) 1309 batadv_neigh_node_put(neigh_node); 1310 return ret; 1311 } 1312 1313 /** 1314 * batadv_iv_ogm_update_seqnos() - process a batman packet for all interfaces, 1315 * adjust the sequence number and find out whether it is a duplicate 1316 * @ethhdr: ethernet header of the packet 1317 * @batadv_ogm_packet: OGM packet to be considered 1318 * @if_incoming: interface on which the OGM packet was received 1319 * @if_outgoing: interface for which the retransmission should be considered 1320 * 1321 * Return: duplicate status as enum batadv_dup_status 1322 */ 1323 static enum batadv_dup_status 1324 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, 1325 const struct batadv_ogm_packet *batadv_ogm_packet, 1326 const struct batadv_hard_iface *if_incoming, 1327 struct batadv_hard_iface *if_outgoing) 1328 { 1329 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1330 struct batadv_orig_node *orig_node; 1331 struct batadv_orig_ifinfo *orig_ifinfo = NULL; 1332 struct batadv_neigh_node *neigh_node; 1333 struct batadv_neigh_ifinfo *neigh_ifinfo; 1334 bool is_dup; 1335 s32 seq_diff; 1336 bool need_update = false; 1337 int set_mark; 1338 enum batadv_dup_status ret = BATADV_NO_DUP; 1339 u32 seqno = ntohl(batadv_ogm_packet->seqno); 1340 u8 *neigh_addr; 1341 u8 packet_count; 1342 unsigned long *bitmap; 1343 1344 orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); 1345 if (!orig_node) 1346 return BATADV_NO_DUP; 1347 1348 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); 1349 if (WARN_ON(!orig_ifinfo)) { 1350 batadv_orig_node_put(orig_node); 1351 return 0; 1352 } 1353 1354 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1355 seq_diff = seqno - orig_ifinfo->last_real_seqno; 1356 1357 /* signalize caller that the packet is to be dropped. */ 1358 if (!hlist_empty(&orig_node->neigh_list) && 1359 batadv_window_protected(bat_priv, seq_diff, 1360 BATADV_TQ_LOCAL_WINDOW_SIZE, 1361 &orig_ifinfo->batman_seqno_reset, NULL)) { 1362 ret = BATADV_PROTECTED; 1363 goto out; 1364 } 1365 1366 rcu_read_lock(); 1367 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { 1368 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, 1369 if_outgoing); 1370 if (!neigh_ifinfo) 1371 continue; 1372 1373 neigh_addr = neigh_node->addr; 1374 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits, 1375 orig_ifinfo->last_real_seqno, 1376 seqno); 1377 1378 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && 1379 neigh_node->if_incoming == if_incoming) { 1380 set_mark = 1; 1381 if (is_dup) 1382 ret = BATADV_NEIGH_DUP; 1383 } else { 1384 set_mark = 0; 1385 if (is_dup && ret != BATADV_NEIGH_DUP) 1386 ret = BATADV_ORIG_DUP; 1387 } 1388 1389 /* if the window moved, set the update flag. */ 1390 bitmap = neigh_ifinfo->bat_iv.real_bits; 1391 need_update |= batadv_bit_get_packet(bat_priv, bitmap, 1392 seq_diff, set_mark); 1393 1394 packet_count = bitmap_weight(bitmap, 1395 BATADV_TQ_LOCAL_WINDOW_SIZE); 1396 neigh_ifinfo->bat_iv.real_packet_count = packet_count; 1397 batadv_neigh_ifinfo_put(neigh_ifinfo); 1398 } 1399 rcu_read_unlock(); 1400 1401 if (need_update) { 1402 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1403 "%s updating last_seqno: old %u, new %u\n", 1404 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT", 1405 orig_ifinfo->last_real_seqno, seqno); 1406 orig_ifinfo->last_real_seqno = seqno; 1407 } 1408 1409 out: 1410 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); 1411 batadv_orig_node_put(orig_node); 1412 batadv_orig_ifinfo_put(orig_ifinfo); 1413 return ret; 1414 } 1415 1416 /** 1417 * batadv_iv_ogm_process_per_outif() - process a batman iv OGM for an outgoing 1418 * interface 1419 * @skb: the skb containing the OGM 1420 * @ogm_offset: offset from skb->data to start of ogm header 1421 * @orig_node: the (cached) orig node for the originator of this OGM 1422 * @if_incoming: the interface where this packet was received 1423 * @if_outgoing: the interface for which the packet should be considered 1424 */ 1425 static void 1426 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, 1427 struct batadv_orig_node *orig_node, 1428 struct batadv_hard_iface *if_incoming, 1429 struct batadv_hard_iface *if_outgoing) 1430 { 1431 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1432 struct batadv_hardif_neigh_node *hardif_neigh = NULL; 1433 struct batadv_neigh_node *router = NULL; 1434 struct batadv_neigh_node *router_router = NULL; 1435 struct batadv_orig_node *orig_neigh_node; 1436 struct batadv_orig_ifinfo *orig_ifinfo; 1437 struct batadv_neigh_node *orig_neigh_router = NULL; 1438 struct batadv_neigh_ifinfo *router_ifinfo = NULL; 1439 struct batadv_ogm_packet *ogm_packet; 1440 enum batadv_dup_status dup_status; 1441 bool is_from_best_next_hop = false; 1442 bool is_single_hop_neigh = false; 1443 bool sameseq, similar_ttl; 1444 struct sk_buff *skb_priv; 1445 struct ethhdr *ethhdr; 1446 u8 *prev_sender; 1447 bool is_bidirect; 1448 1449 /* create a private copy of the skb, as some functions change tq value 1450 * and/or flags. 1451 */ 1452 skb_priv = skb_copy(skb, GFP_ATOMIC); 1453 if (!skb_priv) 1454 return; 1455 1456 ethhdr = eth_hdr(skb_priv); 1457 ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset); 1458 1459 dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet, 1460 if_incoming, if_outgoing); 1461 if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig)) 1462 is_single_hop_neigh = true; 1463 1464 if (dup_status == BATADV_PROTECTED) { 1465 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1466 "Drop packet: packet within seqno protection time (sender: %pM)\n", 1467 ethhdr->h_source); 1468 goto out; 1469 } 1470 1471 if (ogm_packet->tq == 0) { 1472 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1473 "Drop packet: originator packet with tq equal 0\n"); 1474 goto out; 1475 } 1476 1477 if (is_single_hop_neigh) { 1478 hardif_neigh = batadv_hardif_neigh_get(if_incoming, 1479 ethhdr->h_source); 1480 if (hardif_neigh) 1481 hardif_neigh->last_seen = jiffies; 1482 } 1483 1484 router = batadv_orig_router_get(orig_node, if_outgoing); 1485 if (router) { 1486 router_router = batadv_orig_router_get(router->orig_node, 1487 if_outgoing); 1488 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); 1489 } 1490 1491 if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) && 1492 (batadv_compare_eth(router->addr, ethhdr->h_source))) 1493 is_from_best_next_hop = true; 1494 1495 prev_sender = ogm_packet->prev_sender; 1496 /* avoid temporary routing loops */ 1497 if (router && router_router && 1498 (batadv_compare_eth(router->addr, prev_sender)) && 1499 !(batadv_compare_eth(ogm_packet->orig, prev_sender)) && 1500 (batadv_compare_eth(router->addr, router_router->addr))) { 1501 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1502 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", 1503 ethhdr->h_source); 1504 goto out; 1505 } 1506 1507 if (if_outgoing == BATADV_IF_DEFAULT) 1508 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node); 1509 1510 /* if sender is a direct neighbor the sender mac equals 1511 * originator mac 1512 */ 1513 if (is_single_hop_neigh) 1514 orig_neigh_node = orig_node; 1515 else 1516 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, 1517 ethhdr->h_source); 1518 1519 if (!orig_neigh_node) 1520 goto out; 1521 1522 /* Update nc_nodes of the originator */ 1523 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, 1524 ogm_packet, is_single_hop_neigh); 1525 1526 orig_neigh_router = batadv_orig_router_get(orig_neigh_node, 1527 if_outgoing); 1528 1529 /* drop packet if sender is not a direct neighbor and if we 1530 * don't route towards it 1531 */ 1532 if (!is_single_hop_neigh && !orig_neigh_router) { 1533 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1534 "Drop packet: OGM via unknown neighbor!\n"); 1535 goto out_neigh; 1536 } 1537 1538 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, 1539 ogm_packet, if_incoming, 1540 if_outgoing); 1541 1542 /* update ranking if it is not a duplicate or has the same 1543 * seqno and similar ttl as the non-duplicate 1544 */ 1545 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); 1546 if (!orig_ifinfo) 1547 goto out_neigh; 1548 1549 sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno); 1550 similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl; 1551 1552 if (is_bidirect && (dup_status == BATADV_NO_DUP || 1553 (sameseq && similar_ttl))) { 1554 batadv_iv_ogm_orig_update(bat_priv, orig_node, 1555 orig_ifinfo, ethhdr, 1556 ogm_packet, if_incoming, 1557 if_outgoing, dup_status); 1558 } 1559 batadv_orig_ifinfo_put(orig_ifinfo); 1560 1561 /* only forward for specific interface, not for the default one. */ 1562 if (if_outgoing == BATADV_IF_DEFAULT) 1563 goto out_neigh; 1564 1565 /* is single hop (direct) neighbor */ 1566 if (is_single_hop_neigh) { 1567 /* OGMs from secondary interfaces should only scheduled once 1568 * per interface where it has been received, not multiple times 1569 */ 1570 if (ogm_packet->ttl <= 2 && 1571 if_incoming != if_outgoing) { 1572 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1573 "Drop packet: OGM from secondary interface and wrong outgoing interface\n"); 1574 goto out_neigh; 1575 } 1576 /* mark direct link on incoming interface */ 1577 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, 1578 is_single_hop_neigh, 1579 is_from_best_next_hop, if_incoming, 1580 if_outgoing); 1581 1582 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1583 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); 1584 goto out_neigh; 1585 } 1586 1587 /* multihop originator */ 1588 if (!is_bidirect) { 1589 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1590 "Drop packet: not received via bidirectional link\n"); 1591 goto out_neigh; 1592 } 1593 1594 if (dup_status == BATADV_NEIGH_DUP) { 1595 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1596 "Drop packet: duplicate packet received\n"); 1597 goto out_neigh; 1598 } 1599 1600 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1601 "Forwarding packet: rebroadcast originator packet\n"); 1602 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, 1603 is_single_hop_neigh, is_from_best_next_hop, 1604 if_incoming, if_outgoing); 1605 1606 out_neigh: 1607 if (orig_neigh_node && !is_single_hop_neigh) 1608 batadv_orig_node_put(orig_neigh_node); 1609 out: 1610 if (router_ifinfo) 1611 batadv_neigh_ifinfo_put(router_ifinfo); 1612 if (router) 1613 batadv_neigh_node_put(router); 1614 if (router_router) 1615 batadv_neigh_node_put(router_router); 1616 if (orig_neigh_router) 1617 batadv_neigh_node_put(orig_neigh_router); 1618 if (hardif_neigh) 1619 batadv_hardif_neigh_put(hardif_neigh); 1620 1621 consume_skb(skb_priv); 1622 } 1623 1624 /** 1625 * batadv_iv_ogm_process() - process an incoming batman iv OGM 1626 * @skb: the skb containing the OGM 1627 * @ogm_offset: offset to the OGM which should be processed (for aggregates) 1628 * @if_incoming: the interface where this packet was receved 1629 */ 1630 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, 1631 struct batadv_hard_iface *if_incoming) 1632 { 1633 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1634 struct batadv_orig_node *orig_neigh_node, *orig_node; 1635 struct batadv_hard_iface *hard_iface; 1636 struct batadv_ogm_packet *ogm_packet; 1637 u32 if_incoming_seqno; 1638 bool has_directlink_flag; 1639 struct ethhdr *ethhdr; 1640 bool is_my_oldorig = false; 1641 bool is_my_addr = false; 1642 bool is_my_orig = false; 1643 1644 ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset); 1645 ethhdr = eth_hdr(skb); 1646 1647 /* Silently drop when the batman packet is actually not a 1648 * correct packet. 1649 * 1650 * This might happen if a packet is padded (e.g. Ethernet has a 1651 * minimum frame length of 64 byte) and the aggregation interprets 1652 * it as an additional length. 1653 * 1654 * TODO: A more sane solution would be to have a bit in the 1655 * batadv_ogm_packet to detect whether the packet is the last 1656 * packet in an aggregation. Here we expect that the padding 1657 * is always zero (or not 0x01) 1658 */ 1659 if (ogm_packet->packet_type != BATADV_IV_OGM) 1660 return; 1661 1662 /* could be changed by schedule_own_packet() */ 1663 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); 1664 1665 if (ogm_packet->flags & BATADV_DIRECTLINK) 1666 has_directlink_flag = true; 1667 else 1668 has_directlink_flag = false; 1669 1670 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1671 "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", 1672 ethhdr->h_source, if_incoming->net_dev->name, 1673 if_incoming->net_dev->dev_addr, ogm_packet->orig, 1674 ogm_packet->prev_sender, ntohl(ogm_packet->seqno), 1675 ogm_packet->tq, ogm_packet->ttl, 1676 ogm_packet->version, has_directlink_flag); 1677 1678 rcu_read_lock(); 1679 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 1680 if (hard_iface->if_status != BATADV_IF_ACTIVE) 1681 continue; 1682 1683 if (hard_iface->soft_iface != if_incoming->soft_iface) 1684 continue; 1685 1686 if (batadv_compare_eth(ethhdr->h_source, 1687 hard_iface->net_dev->dev_addr)) 1688 is_my_addr = true; 1689 1690 if (batadv_compare_eth(ogm_packet->orig, 1691 hard_iface->net_dev->dev_addr)) 1692 is_my_orig = true; 1693 1694 if (batadv_compare_eth(ogm_packet->prev_sender, 1695 hard_iface->net_dev->dev_addr)) 1696 is_my_oldorig = true; 1697 } 1698 rcu_read_unlock(); 1699 1700 if (is_my_addr) { 1701 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1702 "Drop packet: received my own broadcast (sender: %pM)\n", 1703 ethhdr->h_source); 1704 return; 1705 } 1706 1707 if (is_my_orig) { 1708 unsigned long *word; 1709 size_t offset; 1710 s32 bit_pos; 1711 unsigned int if_num; 1712 u8 *weight; 1713 1714 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, 1715 ethhdr->h_source); 1716 if (!orig_neigh_node) 1717 return; 1718 1719 /* neighbor has to indicate direct link and it has to 1720 * come via the corresponding interface 1721 * save packet seqno for bidirectional check 1722 */ 1723 if (has_directlink_flag && 1724 batadv_compare_eth(if_incoming->net_dev->dev_addr, 1725 ogm_packet->orig)) { 1726 if_num = if_incoming->if_num; 1727 offset = if_num * BATADV_NUM_WORDS; 1728 1729 spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); 1730 word = &orig_neigh_node->bat_iv.bcast_own[offset]; 1731 bit_pos = if_incoming_seqno - 2; 1732 bit_pos -= ntohl(ogm_packet->seqno); 1733 batadv_set_bit(word, bit_pos); 1734 weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num]; 1735 *weight = bitmap_weight(word, 1736 BATADV_TQ_LOCAL_WINDOW_SIZE); 1737 spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock); 1738 } 1739 1740 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1741 "Drop packet: originator packet from myself (via neighbor)\n"); 1742 batadv_orig_node_put(orig_neigh_node); 1743 return; 1744 } 1745 1746 if (is_my_oldorig) { 1747 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1748 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", 1749 ethhdr->h_source); 1750 return; 1751 } 1752 1753 if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { 1754 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 1755 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", 1756 ethhdr->h_source); 1757 return; 1758 } 1759 1760 orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig); 1761 if (!orig_node) 1762 return; 1763 1764 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, 1765 if_incoming, BATADV_IF_DEFAULT); 1766 1767 rcu_read_lock(); 1768 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 1769 if (hard_iface->if_status != BATADV_IF_ACTIVE) 1770 continue; 1771 1772 if (hard_iface->soft_iface != bat_priv->soft_iface) 1773 continue; 1774 1775 if (!kref_get_unless_zero(&hard_iface->refcount)) 1776 continue; 1777 1778 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, 1779 if_incoming, hard_iface); 1780 1781 batadv_hardif_put(hard_iface); 1782 } 1783 rcu_read_unlock(); 1784 1785 batadv_orig_node_put(orig_node); 1786 } 1787 1788 static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work) 1789 { 1790 struct delayed_work *delayed_work; 1791 struct batadv_forw_packet *forw_packet; 1792 struct batadv_priv *bat_priv; 1793 bool dropped = false; 1794 1795 delayed_work = to_delayed_work(work); 1796 forw_packet = container_of(delayed_work, struct batadv_forw_packet, 1797 delayed_work); 1798 bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); 1799 1800 if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) { 1801 dropped = true; 1802 goto out; 1803 } 1804 1805 batadv_iv_ogm_emit(forw_packet); 1806 1807 /* we have to have at least one packet in the queue to determine the 1808 * queues wake up time unless we are shutting down. 1809 * 1810 * only re-schedule if this is the "original" copy, e.g. the OGM of the 1811 * primary interface should only be rescheduled once per period, but 1812 * this function will be called for the forw_packet instances of the 1813 * other secondary interfaces as well. 1814 */ 1815 if (forw_packet->own && 1816 forw_packet->if_incoming == forw_packet->if_outgoing) 1817 batadv_iv_ogm_schedule(forw_packet->if_incoming); 1818 1819 out: 1820 /* do we get something for free()? */ 1821 if (batadv_forw_packet_steal(forw_packet, 1822 &bat_priv->forw_bat_list_lock)) 1823 batadv_forw_packet_free(forw_packet, dropped); 1824 } 1825 1826 static int batadv_iv_ogm_receive(struct sk_buff *skb, 1827 struct batadv_hard_iface *if_incoming) 1828 { 1829 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); 1830 struct batadv_ogm_packet *ogm_packet; 1831 u8 *packet_pos; 1832 int ogm_offset; 1833 bool res; 1834 int ret = NET_RX_DROP; 1835 1836 res = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); 1837 if (!res) 1838 goto free_skb; 1839 1840 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface 1841 * that does not have B.A.T.M.A.N. IV enabled ? 1842 */ 1843 if (bat_priv->algo_ops->iface.enable != batadv_iv_ogm_iface_enable) 1844 goto free_skb; 1845 1846 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); 1847 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, 1848 skb->len + ETH_HLEN); 1849 1850 ogm_offset = 0; 1851 ogm_packet = (struct batadv_ogm_packet *)skb->data; 1852 1853 /* unpack the aggregated packets and process them one by one */ 1854 while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb), 1855 ogm_packet->tvlv_len)) { 1856 batadv_iv_ogm_process(skb, ogm_offset, if_incoming); 1857 1858 ogm_offset += BATADV_OGM_HLEN; 1859 ogm_offset += ntohs(ogm_packet->tvlv_len); 1860 1861 packet_pos = skb->data + ogm_offset; 1862 ogm_packet = (struct batadv_ogm_packet *)packet_pos; 1863 } 1864 1865 ret = NET_RX_SUCCESS; 1866 1867 free_skb: 1868 if (ret == NET_RX_SUCCESS) 1869 consume_skb(skb); 1870 else 1871 kfree_skb(skb); 1872 1873 return ret; 1874 } 1875 1876 #ifdef CONFIG_BATMAN_ADV_DEBUGFS 1877 /** 1878 * batadv_iv_ogm_orig_print_neigh() - print neighbors for the originator table 1879 * @orig_node: the orig_node for which the neighbors are printed 1880 * @if_outgoing: outgoing interface for these entries 1881 * @seq: debugfs table seq_file struct 1882 * 1883 * Must be called while holding an rcu lock. 1884 */ 1885 static void 1886 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node, 1887 struct batadv_hard_iface *if_outgoing, 1888 struct seq_file *seq) 1889 { 1890 struct batadv_neigh_node *neigh_node; 1891 struct batadv_neigh_ifinfo *n_ifinfo; 1892 1893 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { 1894 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); 1895 if (!n_ifinfo) 1896 continue; 1897 1898 seq_printf(seq, " %pM (%3i)", 1899 neigh_node->addr, 1900 n_ifinfo->bat_iv.tq_avg); 1901 1902 batadv_neigh_ifinfo_put(n_ifinfo); 1903 } 1904 } 1905 1906 /** 1907 * batadv_iv_ogm_orig_print() - print the originator table 1908 * @bat_priv: the bat priv with all the soft interface information 1909 * @seq: debugfs table seq_file struct 1910 * @if_outgoing: the outgoing interface for which this should be printed 1911 */ 1912 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, 1913 struct seq_file *seq, 1914 struct batadv_hard_iface *if_outgoing) 1915 { 1916 struct batadv_neigh_node *neigh_node; 1917 struct batadv_hashtable *hash = bat_priv->orig_hash; 1918 int last_seen_msecs, last_seen_secs; 1919 struct batadv_orig_node *orig_node; 1920 struct batadv_neigh_ifinfo *n_ifinfo; 1921 unsigned long last_seen_jiffies; 1922 struct hlist_head *head; 1923 int batman_count = 0; 1924 u32 i; 1925 1926 seq_puts(seq, 1927 " Originator last-seen (#/255) Nexthop [outgoingIF]: Potential nexthops ...\n"); 1928 1929 for (i = 0; i < hash->size; i++) { 1930 head = &hash->table[i]; 1931 1932 rcu_read_lock(); 1933 hlist_for_each_entry_rcu(orig_node, head, hash_entry) { 1934 neigh_node = batadv_orig_router_get(orig_node, 1935 if_outgoing); 1936 if (!neigh_node) 1937 continue; 1938 1939 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, 1940 if_outgoing); 1941 if (!n_ifinfo) 1942 goto next; 1943 1944 if (n_ifinfo->bat_iv.tq_avg == 0) 1945 goto next; 1946 1947 last_seen_jiffies = jiffies - orig_node->last_seen; 1948 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); 1949 last_seen_secs = last_seen_msecs / 1000; 1950 last_seen_msecs = last_seen_msecs % 1000; 1951 1952 seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", 1953 orig_node->orig, last_seen_secs, 1954 last_seen_msecs, n_ifinfo->bat_iv.tq_avg, 1955 neigh_node->addr, 1956 neigh_node->if_incoming->net_dev->name); 1957 1958 batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing, 1959 seq); 1960 seq_putc(seq, '\n'); 1961 batman_count++; 1962 1963 next: 1964 batadv_neigh_node_put(neigh_node); 1965 if (n_ifinfo) 1966 batadv_neigh_ifinfo_put(n_ifinfo); 1967 } 1968 rcu_read_unlock(); 1969 } 1970 1971 if (batman_count == 0) 1972 seq_puts(seq, "No batman nodes in range ...\n"); 1973 } 1974 #endif 1975 1976 /** 1977 * batadv_iv_ogm_neigh_get_tq_avg() - Get the TQ average for a neighbour on a 1978 * given outgoing interface. 1979 * @neigh_node: Neighbour of interest 1980 * @if_outgoing: Outgoing interface of interest 1981 * @tq_avg: Pointer of where to store the TQ average 1982 * 1983 * Return: False if no average TQ available, otherwise true. 1984 */ 1985 static bool 1986 batadv_iv_ogm_neigh_get_tq_avg(struct batadv_neigh_node *neigh_node, 1987 struct batadv_hard_iface *if_outgoing, 1988 u8 *tq_avg) 1989 { 1990 struct batadv_neigh_ifinfo *n_ifinfo; 1991 1992 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); 1993 if (!n_ifinfo) 1994 return false; 1995 1996 *tq_avg = n_ifinfo->bat_iv.tq_avg; 1997 batadv_neigh_ifinfo_put(n_ifinfo); 1998 1999 return true; 2000 } 2001 2002 /** 2003 * batadv_iv_ogm_orig_dump_subentry() - Dump an originator subentry into a 2004 * message 2005 * @msg: Netlink message to dump into 2006 * @portid: Port making netlink request 2007 * @seq: Sequence number of netlink message 2008 * @bat_priv: The bat priv with all the soft interface information 2009 * @if_outgoing: Limit dump to entries with this outgoing interface 2010 * @orig_node: Originator to dump 2011 * @neigh_node: Single hops neighbour 2012 * @best: Is the best originator 2013 * 2014 * Return: Error code, or 0 on success 2015 */ 2016 static int 2017 batadv_iv_ogm_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq, 2018 struct batadv_priv *bat_priv, 2019 struct batadv_hard_iface *if_outgoing, 2020 struct batadv_orig_node *orig_node, 2021 struct batadv_neigh_node *neigh_node, 2022 bool best) 2023 { 2024 void *hdr; 2025 u8 tq_avg; 2026 unsigned int last_seen_msecs; 2027 2028 last_seen_msecs = jiffies_to_msecs(jiffies - orig_node->last_seen); 2029 2030 if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node, if_outgoing, &tq_avg)) 2031 return 0; 2032 2033 if (if_outgoing != BATADV_IF_DEFAULT && 2034 if_outgoing != neigh_node->if_incoming) 2035 return 0; 2036 2037 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, 2038 NLM_F_MULTI, BATADV_CMD_GET_ORIGINATORS); 2039 if (!hdr) 2040 return -ENOBUFS; 2041 2042 if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, 2043 orig_node->orig) || 2044 nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN, 2045 neigh_node->addr) || 2046 nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, 2047 neigh_node->if_incoming->net_dev->ifindex) || 2048 nla_put_u8(msg, BATADV_ATTR_TQ, tq_avg) || 2049 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, 2050 last_seen_msecs)) 2051 goto nla_put_failure; 2052 2053 if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) 2054 goto nla_put_failure; 2055 2056 genlmsg_end(msg, hdr); 2057 return 0; 2058 2059 nla_put_failure: 2060 genlmsg_cancel(msg, hdr); 2061 return -EMSGSIZE; 2062 } 2063 2064 /** 2065 * batadv_iv_ogm_orig_dump_entry() - Dump an originator entry into a message 2066 * @msg: Netlink message to dump into 2067 * @portid: Port making netlink request 2068 * @seq: Sequence number of netlink message 2069 * @bat_priv: The bat priv with all the soft interface information 2070 * @if_outgoing: Limit dump to entries with this outgoing interface 2071 * @orig_node: Originator to dump 2072 * @sub_s: Number of sub entries to skip 2073 * 2074 * This function assumes the caller holds rcu_read_lock(). 2075 * 2076 * Return: Error code, or 0 on success 2077 */ 2078 static int 2079 batadv_iv_ogm_orig_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, 2080 struct batadv_priv *bat_priv, 2081 struct batadv_hard_iface *if_outgoing, 2082 struct batadv_orig_node *orig_node, int *sub_s) 2083 { 2084 struct batadv_neigh_node *neigh_node_best; 2085 struct batadv_neigh_node *neigh_node; 2086 int sub = 0; 2087 bool best; 2088 u8 tq_avg_best; 2089 2090 neigh_node_best = batadv_orig_router_get(orig_node, if_outgoing); 2091 if (!neigh_node_best) 2092 goto out; 2093 2094 if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node_best, if_outgoing, 2095 &tq_avg_best)) 2096 goto out; 2097 2098 if (tq_avg_best == 0) 2099 goto out; 2100 2101 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { 2102 if (sub++ < *sub_s) 2103 continue; 2104 2105 best = (neigh_node == neigh_node_best); 2106 2107 if (batadv_iv_ogm_orig_dump_subentry(msg, portid, seq, 2108 bat_priv, if_outgoing, 2109 orig_node, neigh_node, 2110 best)) { 2111 batadv_neigh_node_put(neigh_node_best); 2112 2113 *sub_s = sub - 1; 2114 return -EMSGSIZE; 2115 } 2116 } 2117 2118 out: 2119 if (neigh_node_best) 2120 batadv_neigh_node_put(neigh_node_best); 2121 2122 *sub_s = 0; 2123 return 0; 2124 } 2125 2126 /** 2127 * batadv_iv_ogm_orig_dump_bucket() - Dump an originator bucket into a 2128 * message 2129 * @msg: Netlink message to dump into 2130 * @portid: Port making netlink request 2131 * @seq: Sequence number of netlink message 2132 * @bat_priv: The bat priv with all the soft interface information 2133 * @if_outgoing: Limit dump to entries with this outgoing interface 2134 * @head: Bucket to be dumped 2135 * @idx_s: Number of entries to be skipped 2136 * @sub: Number of sub entries to be skipped 2137 * 2138 * Return: Error code, or 0 on success 2139 */ 2140 static int 2141 batadv_iv_ogm_orig_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, 2142 struct batadv_priv *bat_priv, 2143 struct batadv_hard_iface *if_outgoing, 2144 struct hlist_head *head, int *idx_s, int *sub) 2145 { 2146 struct batadv_orig_node *orig_node; 2147 int idx = 0; 2148 2149 rcu_read_lock(); 2150 hlist_for_each_entry_rcu(orig_node, head, hash_entry) { 2151 if (idx++ < *idx_s) 2152 continue; 2153 2154 if (batadv_iv_ogm_orig_dump_entry(msg, portid, seq, bat_priv, 2155 if_outgoing, orig_node, 2156 sub)) { 2157 rcu_read_unlock(); 2158 *idx_s = idx - 1; 2159 return -EMSGSIZE; 2160 } 2161 } 2162 rcu_read_unlock(); 2163 2164 *idx_s = 0; 2165 *sub = 0; 2166 return 0; 2167 } 2168 2169 /** 2170 * batadv_iv_ogm_orig_dump() - Dump the originators into a message 2171 * @msg: Netlink message to dump into 2172 * @cb: Control block containing additional options 2173 * @bat_priv: The bat priv with all the soft interface information 2174 * @if_outgoing: Limit dump to entries with this outgoing interface 2175 */ 2176 static void 2177 batadv_iv_ogm_orig_dump(struct sk_buff *msg, struct netlink_callback *cb, 2178 struct batadv_priv *bat_priv, 2179 struct batadv_hard_iface *if_outgoing) 2180 { 2181 struct batadv_hashtable *hash = bat_priv->orig_hash; 2182 struct hlist_head *head; 2183 int bucket = cb->args[0]; 2184 int idx = cb->args[1]; 2185 int sub = cb->args[2]; 2186 int portid = NETLINK_CB(cb->skb).portid; 2187 2188 while (bucket < hash->size) { 2189 head = &hash->table[bucket]; 2190 2191 if (batadv_iv_ogm_orig_dump_bucket(msg, portid, 2192 cb->nlh->nlmsg_seq, 2193 bat_priv, if_outgoing, head, 2194 &idx, &sub)) 2195 break; 2196 2197 bucket++; 2198 } 2199 2200 cb->args[0] = bucket; 2201 cb->args[1] = idx; 2202 cb->args[2] = sub; 2203 } 2204 2205 #ifdef CONFIG_BATMAN_ADV_DEBUGFS 2206 /** 2207 * batadv_iv_hardif_neigh_print() - print a single hop neighbour node 2208 * @seq: neighbour table seq_file struct 2209 * @hardif_neigh: hardif neighbour information 2210 */ 2211 static void 2212 batadv_iv_hardif_neigh_print(struct seq_file *seq, 2213 struct batadv_hardif_neigh_node *hardif_neigh) 2214 { 2215 int last_secs, last_msecs; 2216 2217 last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000; 2218 last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000; 2219 2220 seq_printf(seq, " %10s %pM %4i.%03is\n", 2221 hardif_neigh->if_incoming->net_dev->name, 2222 hardif_neigh->addr, last_secs, last_msecs); 2223 } 2224 2225 /** 2226 * batadv_iv_ogm_neigh_print() - print the single hop neighbour list 2227 * @bat_priv: the bat priv with all the soft interface information 2228 * @seq: neighbour table seq_file struct 2229 */ 2230 static void batadv_iv_neigh_print(struct batadv_priv *bat_priv, 2231 struct seq_file *seq) 2232 { 2233 struct net_device *net_dev = (struct net_device *)seq->private; 2234 struct batadv_hardif_neigh_node *hardif_neigh; 2235 struct batadv_hard_iface *hard_iface; 2236 int batman_count = 0; 2237 2238 seq_puts(seq, " IF Neighbor last-seen\n"); 2239 2240 rcu_read_lock(); 2241 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { 2242 if (hard_iface->soft_iface != net_dev) 2243 continue; 2244 2245 hlist_for_each_entry_rcu(hardif_neigh, 2246 &hard_iface->neigh_list, list) { 2247 batadv_iv_hardif_neigh_print(seq, hardif_neigh); 2248 batman_count++; 2249 } 2250 } 2251 rcu_read_unlock(); 2252 2253 if (batman_count == 0) 2254 seq_puts(seq, "No batman nodes in range ...\n"); 2255 } 2256 #endif 2257 2258 /** 2259 * batadv_iv_ogm_neigh_diff() - calculate tq difference of two neighbors 2260 * @neigh1: the first neighbor object of the comparison 2261 * @if_outgoing1: outgoing interface for the first neighbor 2262 * @neigh2: the second neighbor object of the comparison 2263 * @if_outgoing2: outgoing interface for the second neighbor 2264 * @diff: pointer to integer receiving the calculated difference 2265 * 2266 * The content of *@diff is only valid when this function returns true. 2267 * It is less, equal to or greater than 0 if the metric via neigh1 is lower, 2268 * the same as or higher than the metric via neigh2 2269 * 2270 * Return: true when the difference could be calculated, false otherwise 2271 */ 2272 static bool batadv_iv_ogm_neigh_diff(struct batadv_neigh_node *neigh1, 2273 struct batadv_hard_iface *if_outgoing1, 2274 struct batadv_neigh_node *neigh2, 2275 struct batadv_hard_iface *if_outgoing2, 2276 int *diff) 2277 { 2278 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; 2279 u8 tq1, tq2; 2280 bool ret = true; 2281 2282 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); 2283 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); 2284 2285 if (!neigh1_ifinfo || !neigh2_ifinfo) { 2286 ret = false; 2287 goto out; 2288 } 2289 2290 tq1 = neigh1_ifinfo->bat_iv.tq_avg; 2291 tq2 = neigh2_ifinfo->bat_iv.tq_avg; 2292 *diff = (int)tq1 - (int)tq2; 2293 2294 out: 2295 if (neigh1_ifinfo) 2296 batadv_neigh_ifinfo_put(neigh1_ifinfo); 2297 if (neigh2_ifinfo) 2298 batadv_neigh_ifinfo_put(neigh2_ifinfo); 2299 2300 return ret; 2301 } 2302 2303 /** 2304 * batadv_iv_ogm_neigh_dump_neigh() - Dump a neighbour into a netlink message 2305 * @msg: Netlink message to dump into 2306 * @portid: Port making netlink request 2307 * @seq: Sequence number of netlink message 2308 * @hardif_neigh: Neighbour to be dumped 2309 * 2310 * Return: Error code, or 0 on success 2311 */ 2312 static int 2313 batadv_iv_ogm_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq, 2314 struct batadv_hardif_neigh_node *hardif_neigh) 2315 { 2316 void *hdr; 2317 unsigned int last_seen_msecs; 2318 2319 last_seen_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen); 2320 2321 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, 2322 NLM_F_MULTI, BATADV_CMD_GET_NEIGHBORS); 2323 if (!hdr) 2324 return -ENOBUFS; 2325 2326 if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN, 2327 hardif_neigh->addr) || 2328 nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, 2329 hardif_neigh->if_incoming->net_dev->ifindex) || 2330 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, 2331 last_seen_msecs)) 2332 goto nla_put_failure; 2333 2334 genlmsg_end(msg, hdr); 2335 return 0; 2336 2337 nla_put_failure: 2338 genlmsg_cancel(msg, hdr); 2339 return -EMSGSIZE; 2340 } 2341 2342 /** 2343 * batadv_iv_ogm_neigh_dump_hardif() - Dump the neighbours of a hard interface 2344 * into a message 2345 * @msg: Netlink message to dump into 2346 * @portid: Port making netlink request 2347 * @seq: Sequence number of netlink message 2348 * @bat_priv: The bat priv with all the soft interface information 2349 * @hard_iface: Hard interface to dump the neighbours for 2350 * @idx_s: Number of entries to skip 2351 * 2352 * This function assumes the caller holds rcu_read_lock(). 2353 * 2354 * Return: Error code, or 0 on success 2355 */ 2356 static int 2357 batadv_iv_ogm_neigh_dump_hardif(struct sk_buff *msg, u32 portid, u32 seq, 2358 struct batadv_priv *bat_priv, 2359 struct batadv_hard_iface *hard_iface, 2360 int *idx_s) 2361 { 2362 struct batadv_hardif_neigh_node *hardif_neigh; 2363 int idx = 0; 2364 2365 hlist_for_each_entry_rcu(hardif_neigh, 2366 &hard_iface->neigh_list, list) { 2367 if (idx++ < *idx_s) 2368 continue; 2369 2370 if (batadv_iv_ogm_neigh_dump_neigh(msg, portid, seq, 2371 hardif_neigh)) { 2372 *idx_s = idx - 1; 2373 return -EMSGSIZE; 2374 } 2375 } 2376 2377 *idx_s = 0; 2378 return 0; 2379 } 2380 2381 /** 2382 * batadv_iv_ogm_neigh_dump() - Dump the neighbours into a message 2383 * @msg: Netlink message to dump into 2384 * @cb: Control block containing additional options 2385 * @bat_priv: The bat priv with all the soft interface information 2386 * @single_hardif: Limit dump to this hard interfaace 2387 */ 2388 static void 2389 batadv_iv_ogm_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb, 2390 struct batadv_priv *bat_priv, 2391 struct batadv_hard_iface *single_hardif) 2392 { 2393 struct batadv_hard_iface *hard_iface; 2394 int i_hardif = 0; 2395 int i_hardif_s = cb->args[0]; 2396 int idx = cb->args[1]; 2397 int portid = NETLINK_CB(cb->skb).portid; 2398 2399 rcu_read_lock(); 2400 if (single_hardif) { 2401 if (i_hardif_s == 0) { 2402 if (batadv_iv_ogm_neigh_dump_hardif(msg, portid, 2403 cb->nlh->nlmsg_seq, 2404 bat_priv, 2405 single_hardif, 2406 &idx) == 0) 2407 i_hardif++; 2408 } 2409 } else { 2410 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, 2411 list) { 2412 if (hard_iface->soft_iface != bat_priv->soft_iface) 2413 continue; 2414 2415 if (i_hardif++ < i_hardif_s) 2416 continue; 2417 2418 if (batadv_iv_ogm_neigh_dump_hardif(msg, portid, 2419 cb->nlh->nlmsg_seq, 2420 bat_priv, 2421 hard_iface, &idx)) { 2422 i_hardif--; 2423 break; 2424 } 2425 } 2426 } 2427 rcu_read_unlock(); 2428 2429 cb->args[0] = i_hardif; 2430 cb->args[1] = idx; 2431 } 2432 2433 /** 2434 * batadv_iv_ogm_neigh_cmp() - compare the metrics of two neighbors 2435 * @neigh1: the first neighbor object of the comparison 2436 * @if_outgoing1: outgoing interface for the first neighbor 2437 * @neigh2: the second neighbor object of the comparison 2438 * @if_outgoing2: outgoing interface for the second neighbor 2439 * 2440 * Return: a value less, equal to or greater than 0 if the metric via neigh1 is 2441 * lower, the same as or higher than the metric via neigh2 2442 */ 2443 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, 2444 struct batadv_hard_iface *if_outgoing1, 2445 struct batadv_neigh_node *neigh2, 2446 struct batadv_hard_iface *if_outgoing2) 2447 { 2448 bool ret; 2449 int diff; 2450 2451 ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2, 2452 if_outgoing2, &diff); 2453 if (!ret) 2454 return 0; 2455 2456 return diff; 2457 } 2458 2459 /** 2460 * batadv_iv_ogm_neigh_is_sob() - check if neigh1 is similarly good or better 2461 * than neigh2 from the metric prospective 2462 * @neigh1: the first neighbor object of the comparison 2463 * @if_outgoing1: outgoing interface for the first neighbor 2464 * @neigh2: the second neighbor object of the comparison 2465 * @if_outgoing2: outgoing interface for the second neighbor 2466 * 2467 * Return: true if the metric via neigh1 is equally good or better than 2468 * the metric via neigh2, false otherwise. 2469 */ 2470 static bool 2471 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1, 2472 struct batadv_hard_iface *if_outgoing1, 2473 struct batadv_neigh_node *neigh2, 2474 struct batadv_hard_iface *if_outgoing2) 2475 { 2476 bool ret; 2477 int diff; 2478 2479 ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2, 2480 if_outgoing2, &diff); 2481 if (!ret) 2482 return false; 2483 2484 ret = diff > -BATADV_TQ_SIMILARITY_THRESHOLD; 2485 return ret; 2486 } 2487 2488 static void batadv_iv_iface_activate(struct batadv_hard_iface *hard_iface) 2489 { 2490 /* begin scheduling originator messages on that interface */ 2491 batadv_iv_ogm_schedule(hard_iface); 2492 } 2493 2494 /** 2495 * batadv_iv_init_sel_class() - initialize GW selection class 2496 * @bat_priv: the bat priv with all the soft interface information 2497 */ 2498 static void batadv_iv_init_sel_class(struct batadv_priv *bat_priv) 2499 { 2500 /* set default TQ difference threshold to 20 */ 2501 atomic_set(&bat_priv->gw.sel_class, 20); 2502 } 2503 2504 static struct batadv_gw_node * 2505 batadv_iv_gw_get_best_gw_node(struct batadv_priv *bat_priv) 2506 { 2507 struct batadv_neigh_node *router; 2508 struct batadv_neigh_ifinfo *router_ifinfo; 2509 struct batadv_gw_node *gw_node, *curr_gw = NULL; 2510 u64 max_gw_factor = 0; 2511 u64 tmp_gw_factor = 0; 2512 u8 max_tq = 0; 2513 u8 tq_avg; 2514 struct batadv_orig_node *orig_node; 2515 2516 rcu_read_lock(); 2517 hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) { 2518 orig_node = gw_node->orig_node; 2519 router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); 2520 if (!router) 2521 continue; 2522 2523 router_ifinfo = batadv_neigh_ifinfo_get(router, 2524 BATADV_IF_DEFAULT); 2525 if (!router_ifinfo) 2526 goto next; 2527 2528 if (!kref_get_unless_zero(&gw_node->refcount)) 2529 goto next; 2530 2531 tq_avg = router_ifinfo->bat_iv.tq_avg; 2532 2533 switch (atomic_read(&bat_priv->gw.sel_class)) { 2534 case 1: /* fast connection */ 2535 tmp_gw_factor = tq_avg * tq_avg; 2536 tmp_gw_factor *= gw_node->bandwidth_down; 2537 tmp_gw_factor *= 100 * 100; 2538 tmp_gw_factor >>= 18; 2539 2540 if (tmp_gw_factor > max_gw_factor || 2541 (tmp_gw_factor == max_gw_factor && 2542 tq_avg > max_tq)) { 2543 if (curr_gw) 2544 batadv_gw_node_put(curr_gw); 2545 curr_gw = gw_node; 2546 kref_get(&curr_gw->refcount); 2547 } 2548 break; 2549 2550 default: /* 2: stable connection (use best statistic) 2551 * 3: fast-switch (use best statistic but change as 2552 * soon as a better gateway appears) 2553 * XX: late-switch (use best statistic but change as 2554 * soon as a better gateway appears which has 2555 * $routing_class more tq points) 2556 */ 2557 if (tq_avg > max_tq) { 2558 if (curr_gw) 2559 batadv_gw_node_put(curr_gw); 2560 curr_gw = gw_node; 2561 kref_get(&curr_gw->refcount); 2562 } 2563 break; 2564 } 2565 2566 if (tq_avg > max_tq) 2567 max_tq = tq_avg; 2568 2569 if (tmp_gw_factor > max_gw_factor) 2570 max_gw_factor = tmp_gw_factor; 2571 2572 batadv_gw_node_put(gw_node); 2573 2574 next: 2575 batadv_neigh_node_put(router); 2576 if (router_ifinfo) 2577 batadv_neigh_ifinfo_put(router_ifinfo); 2578 } 2579 rcu_read_unlock(); 2580 2581 return curr_gw; 2582 } 2583 2584 static bool batadv_iv_gw_is_eligible(struct batadv_priv *bat_priv, 2585 struct batadv_orig_node *curr_gw_orig, 2586 struct batadv_orig_node *orig_node) 2587 { 2588 struct batadv_neigh_ifinfo *router_orig_ifinfo = NULL; 2589 struct batadv_neigh_ifinfo *router_gw_ifinfo = NULL; 2590 struct batadv_neigh_node *router_gw = NULL; 2591 struct batadv_neigh_node *router_orig = NULL; 2592 u8 gw_tq_avg, orig_tq_avg; 2593 bool ret = false; 2594 2595 /* dynamic re-election is performed only on fast or late switch */ 2596 if (atomic_read(&bat_priv->gw.sel_class) <= 2) 2597 return false; 2598 2599 router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); 2600 if (!router_gw) { 2601 ret = true; 2602 goto out; 2603 } 2604 2605 router_gw_ifinfo = batadv_neigh_ifinfo_get(router_gw, 2606 BATADV_IF_DEFAULT); 2607 if (!router_gw_ifinfo) { 2608 ret = true; 2609 goto out; 2610 } 2611 2612 router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); 2613 if (!router_orig) 2614 goto out; 2615 2616 router_orig_ifinfo = batadv_neigh_ifinfo_get(router_orig, 2617 BATADV_IF_DEFAULT); 2618 if (!router_orig_ifinfo) 2619 goto out; 2620 2621 gw_tq_avg = router_gw_ifinfo->bat_iv.tq_avg; 2622 orig_tq_avg = router_orig_ifinfo->bat_iv.tq_avg; 2623 2624 /* the TQ value has to be better */ 2625 if (orig_tq_avg < gw_tq_avg) 2626 goto out; 2627 2628 /* if the routing class is greater than 3 the value tells us how much 2629 * greater the TQ value of the new gateway must be 2630 */ 2631 if ((atomic_read(&bat_priv->gw.sel_class) > 3) && 2632 (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw.sel_class))) 2633 goto out; 2634 2635 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, 2636 "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", 2637 gw_tq_avg, orig_tq_avg); 2638 2639 ret = true; 2640 out: 2641 if (router_gw_ifinfo) 2642 batadv_neigh_ifinfo_put(router_gw_ifinfo); 2643 if (router_orig_ifinfo) 2644 batadv_neigh_ifinfo_put(router_orig_ifinfo); 2645 if (router_gw) 2646 batadv_neigh_node_put(router_gw); 2647 if (router_orig) 2648 batadv_neigh_node_put(router_orig); 2649 2650 return ret; 2651 } 2652 2653 #ifdef CONFIG_BATMAN_ADV_DEBUGFS 2654 /* fails if orig_node has no router */ 2655 static int batadv_iv_gw_write_buffer_text(struct batadv_priv *bat_priv, 2656 struct seq_file *seq, 2657 const struct batadv_gw_node *gw_node) 2658 { 2659 struct batadv_gw_node *curr_gw; 2660 struct batadv_neigh_node *router; 2661 struct batadv_neigh_ifinfo *router_ifinfo = NULL; 2662 int ret = -1; 2663 2664 router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); 2665 if (!router) 2666 goto out; 2667 2668 router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); 2669 if (!router_ifinfo) 2670 goto out; 2671 2672 curr_gw = batadv_gw_get_selected_gw_node(bat_priv); 2673 2674 seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", 2675 (curr_gw == gw_node ? "=>" : " "), 2676 gw_node->orig_node->orig, 2677 router_ifinfo->bat_iv.tq_avg, router->addr, 2678 router->if_incoming->net_dev->name, 2679 gw_node->bandwidth_down / 10, 2680 gw_node->bandwidth_down % 10, 2681 gw_node->bandwidth_up / 10, 2682 gw_node->bandwidth_up % 10); 2683 ret = seq_has_overflowed(seq) ? -1 : 0; 2684 2685 if (curr_gw) 2686 batadv_gw_node_put(curr_gw); 2687 out: 2688 if (router_ifinfo) 2689 batadv_neigh_ifinfo_put(router_ifinfo); 2690 if (router) 2691 batadv_neigh_node_put(router); 2692 return ret; 2693 } 2694 2695 static void batadv_iv_gw_print(struct batadv_priv *bat_priv, 2696 struct seq_file *seq) 2697 { 2698 struct batadv_gw_node *gw_node; 2699 int gw_count = 0; 2700 2701 seq_puts(seq, 2702 " Gateway (#/255) Nexthop [outgoingIF]: advertised uplink bandwidth\n"); 2703 2704 rcu_read_lock(); 2705 hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) { 2706 /* fails if orig_node has no router */ 2707 if (batadv_iv_gw_write_buffer_text(bat_priv, seq, gw_node) < 0) 2708 continue; 2709 2710 gw_count++; 2711 } 2712 rcu_read_unlock(); 2713 2714 if (gw_count == 0) 2715 seq_puts(seq, "No gateways in range ...\n"); 2716 } 2717 #endif 2718 2719 /** 2720 * batadv_iv_gw_dump_entry() - Dump a gateway into a message 2721 * @msg: Netlink message to dump into 2722 * @portid: Port making netlink request 2723 * @seq: Sequence number of netlink message 2724 * @bat_priv: The bat priv with all the soft interface information 2725 * @gw_node: Gateway to be dumped 2726 * 2727 * Return: Error code, or 0 on success 2728 */ 2729 static int batadv_iv_gw_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, 2730 struct batadv_priv *bat_priv, 2731 struct batadv_gw_node *gw_node) 2732 { 2733 struct batadv_neigh_ifinfo *router_ifinfo = NULL; 2734 struct batadv_neigh_node *router; 2735 struct batadv_gw_node *curr_gw; 2736 int ret = 0; 2737 void *hdr; 2738 2739 router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); 2740 if (!router) 2741 goto out; 2742 2743 router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); 2744 if (!router_ifinfo) 2745 goto out; 2746 2747 curr_gw = batadv_gw_get_selected_gw_node(bat_priv); 2748 2749 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, 2750 NLM_F_MULTI, BATADV_CMD_GET_GATEWAYS); 2751 if (!hdr) { 2752 ret = -ENOBUFS; 2753 goto out; 2754 } 2755 2756 ret = -EMSGSIZE; 2757 2758 if (curr_gw == gw_node) 2759 if (nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) { 2760 genlmsg_cancel(msg, hdr); 2761 goto out; 2762 } 2763 2764 if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, 2765 gw_node->orig_node->orig) || 2766 nla_put_u8(msg, BATADV_ATTR_TQ, router_ifinfo->bat_iv.tq_avg) || 2767 nla_put(msg, BATADV_ATTR_ROUTER, ETH_ALEN, 2768 router->addr) || 2769 nla_put_string(msg, BATADV_ATTR_HARD_IFNAME, 2770 router->if_incoming->net_dev->name) || 2771 nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN, 2772 gw_node->bandwidth_down) || 2773 nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP, 2774 gw_node->bandwidth_up)) { 2775 genlmsg_cancel(msg, hdr); 2776 goto out; 2777 } 2778 2779 genlmsg_end(msg, hdr); 2780 ret = 0; 2781 2782 out: 2783 if (router_ifinfo) 2784 batadv_neigh_ifinfo_put(router_ifinfo); 2785 if (router) 2786 batadv_neigh_node_put(router); 2787 return ret; 2788 } 2789 2790 /** 2791 * batadv_iv_gw_dump() - Dump gateways into a message 2792 * @msg: Netlink message to dump into 2793 * @cb: Control block containing additional options 2794 * @bat_priv: The bat priv with all the soft interface information 2795 */ 2796 static void batadv_iv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb, 2797 struct batadv_priv *bat_priv) 2798 { 2799 int portid = NETLINK_CB(cb->skb).portid; 2800 struct batadv_gw_node *gw_node; 2801 int idx_skip = cb->args[0]; 2802 int idx = 0; 2803 2804 rcu_read_lock(); 2805 hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) { 2806 if (idx++ < idx_skip) 2807 continue; 2808 2809 if (batadv_iv_gw_dump_entry(msg, portid, cb->nlh->nlmsg_seq, 2810 bat_priv, gw_node)) { 2811 idx_skip = idx - 1; 2812 goto unlock; 2813 } 2814 } 2815 2816 idx_skip = idx; 2817 unlock: 2818 rcu_read_unlock(); 2819 2820 cb->args[0] = idx_skip; 2821 } 2822 2823 static struct batadv_algo_ops batadv_batman_iv __read_mostly = { 2824 .name = "BATMAN_IV", 2825 .iface = { 2826 .activate = batadv_iv_iface_activate, 2827 .enable = batadv_iv_ogm_iface_enable, 2828 .disable = batadv_iv_ogm_iface_disable, 2829 .update_mac = batadv_iv_ogm_iface_update_mac, 2830 .primary_set = batadv_iv_ogm_primary_iface_set, 2831 }, 2832 .neigh = { 2833 .cmp = batadv_iv_ogm_neigh_cmp, 2834 .is_similar_or_better = batadv_iv_ogm_neigh_is_sob, 2835 #ifdef CONFIG_BATMAN_ADV_DEBUGFS 2836 .print = batadv_iv_neigh_print, 2837 #endif 2838 .dump = batadv_iv_ogm_neigh_dump, 2839 }, 2840 .orig = { 2841 #ifdef CONFIG_BATMAN_ADV_DEBUGFS 2842 .print = batadv_iv_ogm_orig_print, 2843 #endif 2844 .dump = batadv_iv_ogm_orig_dump, 2845 .free = batadv_iv_ogm_orig_free, 2846 .add_if = batadv_iv_ogm_orig_add_if, 2847 .del_if = batadv_iv_ogm_orig_del_if, 2848 }, 2849 .gw = { 2850 .init_sel_class = batadv_iv_init_sel_class, 2851 .get_best_gw_node = batadv_iv_gw_get_best_gw_node, 2852 .is_eligible = batadv_iv_gw_is_eligible, 2853 #ifdef CONFIG_BATMAN_ADV_DEBUGFS 2854 .print = batadv_iv_gw_print, 2855 #endif 2856 .dump = batadv_iv_gw_dump, 2857 }, 2858 }; 2859 2860 /** 2861 * batadv_iv_init() - B.A.T.M.A.N. IV initialization function 2862 * 2863 * Return: 0 on success or negative error number in case of failure 2864 */ 2865 int __init batadv_iv_init(void) 2866 { 2867 int ret; 2868 2869 /* batman originator packet */ 2870 ret = batadv_recv_handler_register(BATADV_IV_OGM, 2871 batadv_iv_ogm_receive); 2872 if (ret < 0) 2873 goto out; 2874 2875 ret = batadv_algo_register(&batadv_batman_iv); 2876 if (ret < 0) 2877 goto handler_unregister; 2878 2879 goto out; 2880 2881 handler_unregister: 2882 batadv_recv_handler_unregister(BATADV_IV_OGM); 2883 out: 2884 return ret; 2885 } 2886