1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: 2 * 3 * Marek Lindner, Simon Wunderlich, Antonio Quartulli 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of version 2 of the GNU General Public 7 * License as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 17 * 02110-1301, USA 18 */ 19 20 #include "main.h" 21 #include "translation-table.h" 22 #include "soft-interface.h" 23 #include "hard-interface.h" 24 #include "send.h" 25 #include "hash.h" 26 #include "originator.h" 27 #include "routing.h" 28 #include "bridge_loop_avoidance.h" 29 30 #include <linux/crc16.h> 31 32 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, 33 struct batadv_orig_node *orig_node); 34 static void batadv_tt_purge(struct work_struct *work); 35 static void 36 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry); 37 static void batadv_tt_global_del(struct batadv_priv *bat_priv, 38 struct batadv_orig_node *orig_node, 39 const unsigned char *addr, 40 const char *message, bool roaming); 41 42 /* returns 1 if they are the same mac addr */ 43 static int batadv_compare_tt(const struct hlist_node *node, const void *data2) 44 { 45 const void *data1 = container_of(node, struct batadv_tt_common_entry, 46 hash_entry); 47 48 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); 49 } 50 51 static void batadv_tt_start_timer(struct batadv_priv *bat_priv) 52 { 53 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge); 54 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, 55 msecs_to_jiffies(5000)); 56 } 57 58 static struct batadv_tt_common_entry * 59 batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data) 60 { 61 struct hlist_head *head; 62 struct hlist_node *node; 63 struct batadv_tt_common_entry *tt_common_entry; 64 struct batadv_tt_common_entry *tt_common_entry_tmp = NULL; 65 uint32_t index; 66 67 if (!hash) 68 return NULL; 69 70 index = batadv_choose_orig(data, hash->size); 71 head = &hash->table[index]; 72 73 rcu_read_lock(); 74 hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) { 75 if (!batadv_compare_eth(tt_common_entry, data)) 76 continue; 77 78 if (!atomic_inc_not_zero(&tt_common_entry->refcount)) 79 continue; 80 81 tt_common_entry_tmp = tt_common_entry; 82 break; 83 } 84 rcu_read_unlock(); 85 86 return tt_common_entry_tmp; 87 } 88 89 static struct batadv_tt_local_entry * 90 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data) 91 { 92 struct batadv_tt_common_entry *tt_common_entry; 93 struct batadv_tt_local_entry *tt_local_entry = NULL; 94 95 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data); 96 if (tt_common_entry) 97 tt_local_entry = container_of(tt_common_entry, 98 struct batadv_tt_local_entry, 99 common); 100 return tt_local_entry; 101 } 102 103 static struct batadv_tt_global_entry * 104 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data) 105 { 106 struct batadv_tt_common_entry *tt_common_entry; 107 struct batadv_tt_global_entry *tt_global_entry = NULL; 108 109 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data); 110 if (tt_common_entry) 111 tt_global_entry = container_of(tt_common_entry, 112 struct batadv_tt_global_entry, 113 common); 114 return tt_global_entry; 115 116 } 117 118 static void 119 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry) 120 { 121 if (atomic_dec_and_test(&tt_local_entry->common.refcount)) 122 kfree_rcu(tt_local_entry, common.rcu); 123 } 124 125 static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) 126 { 127 struct batadv_tt_common_entry *tt_common_entry; 128 struct batadv_tt_global_entry *tt_global_entry; 129 130 tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu); 131 tt_global_entry = container_of(tt_common_entry, 132 struct batadv_tt_global_entry, common); 133 134 kfree(tt_global_entry); 135 } 136 137 static void 138 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry) 139 { 140 if (atomic_dec_and_test(&tt_global_entry->common.refcount)) { 141 batadv_tt_global_del_orig_list(tt_global_entry); 142 call_rcu(&tt_global_entry->common.rcu, 143 batadv_tt_global_entry_free_rcu); 144 } 145 } 146 147 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) 148 { 149 struct batadv_tt_orig_list_entry *orig_entry; 150 151 orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu); 152 batadv_orig_node_free_ref(orig_entry->orig_node); 153 kfree(orig_entry); 154 } 155 156 static void 157 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry) 158 { 159 if (!atomic_dec_and_test(&orig_entry->refcount)) 160 return; 161 /* to avoid race conditions, immediately decrease the tt counter */ 162 atomic_dec(&orig_entry->orig_node->tt_size); 163 call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu); 164 } 165 166 static void batadv_tt_local_event(struct batadv_priv *bat_priv, 167 const uint8_t *addr, uint8_t flags) 168 { 169 struct batadv_tt_change_node *tt_change_node, *entry, *safe; 170 bool event_removed = false; 171 bool del_op_requested, del_op_entry; 172 173 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); 174 175 if (!tt_change_node) 176 return; 177 178 tt_change_node->change.flags = flags; 179 memcpy(tt_change_node->change.addr, addr, ETH_ALEN); 180 181 del_op_requested = flags & BATADV_TT_CLIENT_DEL; 182 183 /* check for ADD+DEL or DEL+ADD events */ 184 spin_lock_bh(&bat_priv->tt.changes_list_lock); 185 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, 186 list) { 187 if (!batadv_compare_eth(entry->change.addr, addr)) 188 continue; 189 190 /* DEL+ADD in the same orig interval have no effect and can be 191 * removed to avoid silly behaviour on the receiver side. The 192 * other way around (ADD+DEL) can happen in case of roaming of 193 * a client still in the NEW state. Roaming of NEW clients is 194 * now possible due to automatically recognition of "temporary" 195 * clients 196 */ 197 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL; 198 if (!del_op_requested && del_op_entry) 199 goto del; 200 if (del_op_requested && !del_op_entry) 201 goto del; 202 continue; 203 del: 204 list_del(&entry->list); 205 kfree(entry); 206 kfree(tt_change_node); 207 event_removed = true; 208 goto unlock; 209 } 210 211 /* track the change in the OGMinterval list */ 212 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list); 213 214 unlock: 215 spin_unlock_bh(&bat_priv->tt.changes_list_lock); 216 217 if (event_removed) 218 atomic_dec(&bat_priv->tt.local_changes); 219 else 220 atomic_inc(&bat_priv->tt.local_changes); 221 } 222 223 int batadv_tt_len(int changes_num) 224 { 225 return changes_num * sizeof(struct batadv_tt_change); 226 } 227 228 static int batadv_tt_local_init(struct batadv_priv *bat_priv) 229 { 230 if (bat_priv->tt.local_hash) 231 return 0; 232 233 bat_priv->tt.local_hash = batadv_hash_new(1024); 234 235 if (!bat_priv->tt.local_hash) 236 return -ENOMEM; 237 238 return 0; 239 } 240 241 static void batadv_tt_global_free(struct batadv_priv *bat_priv, 242 struct batadv_tt_global_entry *tt_global, 243 const char *message) 244 { 245 batadv_dbg(BATADV_DBG_TT, bat_priv, 246 "Deleting global tt entry %pM: %s\n", 247 tt_global->common.addr, message); 248 249 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt, 250 batadv_choose_orig, tt_global->common.addr); 251 batadv_tt_global_entry_free_ref(tt_global); 252 253 } 254 255 void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, 256 int ifindex) 257 { 258 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 259 struct batadv_tt_local_entry *tt_local; 260 struct batadv_tt_global_entry *tt_global; 261 struct hlist_head *head; 262 struct hlist_node *node; 263 struct batadv_tt_orig_list_entry *orig_entry; 264 int hash_added; 265 bool roamed_back = false; 266 267 tt_local = batadv_tt_local_hash_find(bat_priv, addr); 268 tt_global = batadv_tt_global_hash_find(bat_priv, addr); 269 270 if (tt_local) { 271 tt_local->last_seen = jiffies; 272 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) { 273 batadv_dbg(BATADV_DBG_TT, bat_priv, 274 "Re-adding pending client %pM\n", addr); 275 /* whatever the reason why the PENDING flag was set, 276 * this is a client which was enqueued to be removed in 277 * this orig_interval. Since it popped up again, the 278 * flag can be reset like it was never enqueued 279 */ 280 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING; 281 goto add_event; 282 } 283 284 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) { 285 batadv_dbg(BATADV_DBG_TT, bat_priv, 286 "Roaming client %pM came back to its original location\n", 287 addr); 288 /* the ROAM flag is set because this client roamed away 289 * and the node got a roaming_advertisement message. Now 290 * that the client popped up again at its original 291 * location such flag can be unset 292 */ 293 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM; 294 roamed_back = true; 295 } 296 goto check_roaming; 297 } 298 299 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC); 300 if (!tt_local) 301 goto out; 302 303 batadv_dbg(BATADV_DBG_TT, bat_priv, 304 "Creating new local tt entry: %pM (ttvn: %d)\n", addr, 305 (uint8_t)atomic_read(&bat_priv->tt.vn)); 306 307 memcpy(tt_local->common.addr, addr, ETH_ALEN); 308 tt_local->common.flags = BATADV_NO_FLAGS; 309 if (batadv_is_wifi_iface(ifindex)) 310 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; 311 atomic_set(&tt_local->common.refcount, 2); 312 tt_local->last_seen = jiffies; 313 tt_local->common.added_at = tt_local->last_seen; 314 315 /* the batman interface mac address should never be purged */ 316 if (batadv_compare_eth(addr, soft_iface->dev_addr)) 317 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE; 318 319 /* The local entry has to be marked as NEW to avoid to send it in 320 * a full table response going out before the next ttvn increment 321 * (consistency check) 322 */ 323 tt_local->common.flags |= BATADV_TT_CLIENT_NEW; 324 325 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt, 326 batadv_choose_orig, &tt_local->common, 327 &tt_local->common.hash_entry); 328 329 if (unlikely(hash_added != 0)) { 330 /* remove the reference for the hash */ 331 batadv_tt_local_entry_free_ref(tt_local); 332 goto out; 333 } 334 335 add_event: 336 batadv_tt_local_event(bat_priv, addr, tt_local->common.flags); 337 338 check_roaming: 339 /* Check whether it is a roaming, but don't do anything if the roaming 340 * process has already been handled 341 */ 342 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) { 343 /* These node are probably going to update their tt table */ 344 head = &tt_global->orig_list; 345 rcu_read_lock(); 346 hlist_for_each_entry_rcu(orig_entry, node, head, list) { 347 batadv_send_roam_adv(bat_priv, tt_global->common.addr, 348 orig_entry->orig_node); 349 } 350 rcu_read_unlock(); 351 if (roamed_back) { 352 batadv_tt_global_free(bat_priv, tt_global, 353 "Roaming canceled"); 354 tt_global = NULL; 355 } else { 356 /* The global entry has to be marked as ROAMING and 357 * has to be kept for consistency purpose 358 */ 359 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM; 360 tt_global->roam_at = jiffies; 361 } 362 } 363 364 out: 365 if (tt_local) 366 batadv_tt_local_entry_free_ref(tt_local); 367 if (tt_global) 368 batadv_tt_global_entry_free_ref(tt_global); 369 } 370 371 static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff, 372 int *packet_buff_len, 373 int min_packet_len, 374 int new_packet_len) 375 { 376 unsigned char *new_buff; 377 378 new_buff = kmalloc(new_packet_len, GFP_ATOMIC); 379 380 /* keep old buffer if kmalloc should fail */ 381 if (new_buff) { 382 memcpy(new_buff, *packet_buff, min_packet_len); 383 kfree(*packet_buff); 384 *packet_buff = new_buff; 385 *packet_buff_len = new_packet_len; 386 } 387 } 388 389 static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv, 390 unsigned char **packet_buff, 391 int *packet_buff_len, 392 int min_packet_len) 393 { 394 struct batadv_hard_iface *primary_if; 395 int req_len; 396 397 primary_if = batadv_primary_if_get_selected(bat_priv); 398 399 req_len = min_packet_len; 400 req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes)); 401 402 /* if we have too many changes for one packet don't send any 403 * and wait for the tt table request which will be fragmented 404 */ 405 if ((!primary_if) || (req_len > primary_if->soft_iface->mtu)) 406 req_len = min_packet_len; 407 408 batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, 409 min_packet_len, req_len); 410 411 if (primary_if) 412 batadv_hardif_free_ref(primary_if); 413 } 414 415 static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv, 416 unsigned char **packet_buff, 417 int *packet_buff_len, 418 int min_packet_len) 419 { 420 struct batadv_tt_change_node *entry, *safe; 421 int count = 0, tot_changes = 0, new_len; 422 unsigned char *tt_buff; 423 424 batadv_tt_prepare_packet_buff(bat_priv, packet_buff, 425 packet_buff_len, min_packet_len); 426 427 new_len = *packet_buff_len - min_packet_len; 428 tt_buff = *packet_buff + min_packet_len; 429 430 if (new_len > 0) 431 tot_changes = new_len / batadv_tt_len(1); 432 433 spin_lock_bh(&bat_priv->tt.changes_list_lock); 434 atomic_set(&bat_priv->tt.local_changes, 0); 435 436 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, 437 list) { 438 if (count < tot_changes) { 439 memcpy(tt_buff + batadv_tt_len(count), 440 &entry->change, sizeof(struct batadv_tt_change)); 441 count++; 442 } 443 list_del(&entry->list); 444 kfree(entry); 445 } 446 spin_unlock_bh(&bat_priv->tt.changes_list_lock); 447 448 /* Keep the buffer for possible tt_request */ 449 spin_lock_bh(&bat_priv->tt.last_changeset_lock); 450 kfree(bat_priv->tt.last_changeset); 451 bat_priv->tt.last_changeset_len = 0; 452 bat_priv->tt.last_changeset = NULL; 453 /* check whether this new OGM has no changes due to size problems */ 454 if (new_len > 0) { 455 /* if kmalloc() fails we will reply with the full table 456 * instead of providing the diff 457 */ 458 bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC); 459 if (bat_priv->tt.last_changeset) { 460 memcpy(bat_priv->tt.last_changeset, tt_buff, new_len); 461 bat_priv->tt.last_changeset_len = new_len; 462 } 463 } 464 spin_unlock_bh(&bat_priv->tt.last_changeset_lock); 465 466 return count; 467 } 468 469 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) 470 { 471 struct net_device *net_dev = (struct net_device *)seq->private; 472 struct batadv_priv *bat_priv = netdev_priv(net_dev); 473 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 474 struct batadv_tt_common_entry *tt_common_entry; 475 struct batadv_hard_iface *primary_if; 476 struct hlist_node *node; 477 struct hlist_head *head; 478 uint32_t i; 479 480 primary_if = batadv_seq_print_text_primary_if_get(seq); 481 if (!primary_if) 482 goto out; 483 484 seq_printf(seq, 485 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", 486 net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn)); 487 488 for (i = 0; i < hash->size; i++) { 489 head = &hash->table[i]; 490 491 rcu_read_lock(); 492 hlist_for_each_entry_rcu(tt_common_entry, node, 493 head, hash_entry) { 494 seq_printf(seq, " * %pM [%c%c%c%c%c]\n", 495 tt_common_entry->addr, 496 (tt_common_entry->flags & 497 BATADV_TT_CLIENT_ROAM ? 'R' : '.'), 498 (tt_common_entry->flags & 499 BATADV_TT_CLIENT_NOPURGE ? 'P' : '.'), 500 (tt_common_entry->flags & 501 BATADV_TT_CLIENT_NEW ? 'N' : '.'), 502 (tt_common_entry->flags & 503 BATADV_TT_CLIENT_PENDING ? 'X' : '.'), 504 (tt_common_entry->flags & 505 BATADV_TT_CLIENT_WIFI ? 'W' : '.')); 506 } 507 rcu_read_unlock(); 508 } 509 out: 510 if (primary_if) 511 batadv_hardif_free_ref(primary_if); 512 return 0; 513 } 514 515 static void 516 batadv_tt_local_set_pending(struct batadv_priv *bat_priv, 517 struct batadv_tt_local_entry *tt_local_entry, 518 uint16_t flags, const char *message) 519 { 520 batadv_tt_local_event(bat_priv, tt_local_entry->common.addr, 521 tt_local_entry->common.flags | flags); 522 523 /* The local client has to be marked as "pending to be removed" but has 524 * to be kept in the table in order to send it in a full table 525 * response issued before the net ttvn increment (consistency check) 526 */ 527 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; 528 529 batadv_dbg(BATADV_DBG_TT, bat_priv, 530 "Local tt entry (%pM) pending to be removed: %s\n", 531 tt_local_entry->common.addr, message); 532 } 533 534 /** 535 * batadv_tt_local_remove - logically remove an entry from the local table 536 * @bat_priv: the bat priv with all the soft interface information 537 * @addr: the MAC address of the client to remove 538 * @message: message to append to the log on deletion 539 * @roaming: true if the deletion is due to a roaming event 540 * 541 * Returns the flags assigned to the local entry before being deleted 542 */ 543 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv, 544 const uint8_t *addr, const char *message, 545 bool roaming) 546 { 547 struct batadv_tt_local_entry *tt_local_entry; 548 uint16_t flags, curr_flags = BATADV_NO_FLAGS; 549 550 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); 551 if (!tt_local_entry) 552 goto out; 553 554 curr_flags = tt_local_entry->common.flags; 555 556 flags = BATADV_TT_CLIENT_DEL; 557 /* if this global entry addition is due to a roaming, the node has to 558 * mark the local entry as "roamed" in order to correctly reroute 559 * packets later 560 */ 561 if (roaming) { 562 flags |= BATADV_TT_CLIENT_ROAM; 563 /* mark the local client as ROAMed */ 564 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM; 565 } 566 567 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) { 568 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, 569 message); 570 goto out; 571 } 572 /* if this client has been added right now, it is possible to 573 * immediately purge it 574 */ 575 batadv_tt_local_event(bat_priv, tt_local_entry->common.addr, 576 curr_flags | BATADV_TT_CLIENT_DEL); 577 hlist_del_rcu(&tt_local_entry->common.hash_entry); 578 batadv_tt_local_entry_free_ref(tt_local_entry); 579 580 out: 581 if (tt_local_entry) 582 batadv_tt_local_entry_free_ref(tt_local_entry); 583 584 return curr_flags; 585 } 586 587 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, 588 struct hlist_head *head) 589 { 590 struct batadv_tt_local_entry *tt_local_entry; 591 struct batadv_tt_common_entry *tt_common_entry; 592 struct hlist_node *node, *node_tmp; 593 594 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head, 595 hash_entry) { 596 tt_local_entry = container_of(tt_common_entry, 597 struct batadv_tt_local_entry, 598 common); 599 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) 600 continue; 601 602 /* entry already marked for deletion */ 603 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) 604 continue; 605 606 if (!batadv_has_timed_out(tt_local_entry->last_seen, 607 BATADV_TT_LOCAL_TIMEOUT)) 608 continue; 609 610 batadv_tt_local_set_pending(bat_priv, tt_local_entry, 611 BATADV_TT_CLIENT_DEL, "timed out"); 612 } 613 } 614 615 static void batadv_tt_local_purge(struct batadv_priv *bat_priv) 616 { 617 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 618 struct hlist_head *head; 619 spinlock_t *list_lock; /* protects write access to the hash lists */ 620 uint32_t i; 621 622 for (i = 0; i < hash->size; i++) { 623 head = &hash->table[i]; 624 list_lock = &hash->list_locks[i]; 625 626 spin_lock_bh(list_lock); 627 batadv_tt_local_purge_list(bat_priv, head); 628 spin_unlock_bh(list_lock); 629 } 630 631 } 632 633 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) 634 { 635 struct batadv_hashtable *hash; 636 spinlock_t *list_lock; /* protects write access to the hash lists */ 637 struct batadv_tt_common_entry *tt_common_entry; 638 struct batadv_tt_local_entry *tt_local; 639 struct hlist_node *node, *node_tmp; 640 struct hlist_head *head; 641 uint32_t i; 642 643 if (!bat_priv->tt.local_hash) 644 return; 645 646 hash = bat_priv->tt.local_hash; 647 648 for (i = 0; i < hash->size; i++) { 649 head = &hash->table[i]; 650 list_lock = &hash->list_locks[i]; 651 652 spin_lock_bh(list_lock); 653 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, 654 head, hash_entry) { 655 hlist_del_rcu(node); 656 tt_local = container_of(tt_common_entry, 657 struct batadv_tt_local_entry, 658 common); 659 batadv_tt_local_entry_free_ref(tt_local); 660 } 661 spin_unlock_bh(list_lock); 662 } 663 664 batadv_hash_destroy(hash); 665 666 bat_priv->tt.local_hash = NULL; 667 } 668 669 static int batadv_tt_global_init(struct batadv_priv *bat_priv) 670 { 671 if (bat_priv->tt.global_hash) 672 return 0; 673 674 bat_priv->tt.global_hash = batadv_hash_new(1024); 675 676 if (!bat_priv->tt.global_hash) 677 return -ENOMEM; 678 679 return 0; 680 } 681 682 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) 683 { 684 struct batadv_tt_change_node *entry, *safe; 685 686 spin_lock_bh(&bat_priv->tt.changes_list_lock); 687 688 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, 689 list) { 690 list_del(&entry->list); 691 kfree(entry); 692 } 693 694 atomic_set(&bat_priv->tt.local_changes, 0); 695 spin_unlock_bh(&bat_priv->tt.changes_list_lock); 696 } 697 698 /* retrieves the orig_tt_list_entry belonging to orig_node from the 699 * batadv_tt_global_entry list 700 * 701 * returns it with an increased refcounter, NULL if not found 702 */ 703 static struct batadv_tt_orig_list_entry * 704 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, 705 const struct batadv_orig_node *orig_node) 706 { 707 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL; 708 const struct hlist_head *head; 709 struct hlist_node *node; 710 711 rcu_read_lock(); 712 head = &entry->orig_list; 713 hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) { 714 if (tmp_orig_entry->orig_node != orig_node) 715 continue; 716 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount)) 717 continue; 718 719 orig_entry = tmp_orig_entry; 720 break; 721 } 722 rcu_read_unlock(); 723 724 return orig_entry; 725 } 726 727 /* find out if an orig_node is already in the list of a tt_global_entry. 728 * returns true if found, false otherwise 729 */ 730 static bool 731 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, 732 const struct batadv_orig_node *orig_node) 733 { 734 struct batadv_tt_orig_list_entry *orig_entry; 735 bool found = false; 736 737 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node); 738 if (orig_entry) { 739 found = true; 740 batadv_tt_orig_list_entry_free_ref(orig_entry); 741 } 742 743 return found; 744 } 745 746 static void 747 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, 748 struct batadv_orig_node *orig_node, int ttvn) 749 { 750 struct batadv_tt_orig_list_entry *orig_entry; 751 752 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node); 753 if (orig_entry) { 754 /* refresh the ttvn: the current value could be a bogus one that 755 * was added during a "temporary client detection" 756 */ 757 orig_entry->ttvn = ttvn; 758 goto out; 759 } 760 761 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); 762 if (!orig_entry) 763 goto out; 764 765 INIT_HLIST_NODE(&orig_entry->list); 766 atomic_inc(&orig_node->refcount); 767 atomic_inc(&orig_node->tt_size); 768 orig_entry->orig_node = orig_node; 769 orig_entry->ttvn = ttvn; 770 atomic_set(&orig_entry->refcount, 2); 771 772 spin_lock_bh(&tt_global->list_lock); 773 hlist_add_head_rcu(&orig_entry->list, 774 &tt_global->orig_list); 775 spin_unlock_bh(&tt_global->list_lock); 776 out: 777 if (orig_entry) 778 batadv_tt_orig_list_entry_free_ref(orig_entry); 779 } 780 781 /* caller must hold orig_node refcount */ 782 int batadv_tt_global_add(struct batadv_priv *bat_priv, 783 struct batadv_orig_node *orig_node, 784 const unsigned char *tt_addr, uint8_t flags, 785 uint8_t ttvn) 786 { 787 struct batadv_tt_global_entry *tt_global_entry; 788 struct batadv_tt_local_entry *tt_local_entry; 789 int ret = 0; 790 int hash_added; 791 struct batadv_tt_common_entry *common; 792 uint16_t local_flags; 793 794 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); 795 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr); 796 797 /* if the node already has a local client for this entry, it has to wait 798 * for a roaming advertisement instead of manually messing up the global 799 * table 800 */ 801 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry && 802 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) 803 goto out; 804 805 if (!tt_global_entry) { 806 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC); 807 if (!tt_global_entry) 808 goto out; 809 810 common = &tt_global_entry->common; 811 memcpy(common->addr, tt_addr, ETH_ALEN); 812 813 common->flags = flags; 814 tt_global_entry->roam_at = 0; 815 /* node must store current time in case of roaming. This is 816 * needed to purge this entry out on timeout (if nobody claims 817 * it) 818 */ 819 if (flags & BATADV_TT_CLIENT_ROAM) 820 tt_global_entry->roam_at = jiffies; 821 atomic_set(&common->refcount, 2); 822 common->added_at = jiffies; 823 824 INIT_HLIST_HEAD(&tt_global_entry->orig_list); 825 spin_lock_init(&tt_global_entry->list_lock); 826 827 hash_added = batadv_hash_add(bat_priv->tt.global_hash, 828 batadv_compare_tt, 829 batadv_choose_orig, common, 830 &common->hash_entry); 831 832 if (unlikely(hash_added != 0)) { 833 /* remove the reference for the hash */ 834 batadv_tt_global_entry_free_ref(tt_global_entry); 835 goto out_remove; 836 } 837 } else { 838 common = &tt_global_entry->common; 839 /* If there is already a global entry, we can use this one for 840 * our processing. 841 * But if we are trying to add a temporary client then here are 842 * two options at this point: 843 * 1) the global client is not a temporary client: the global 844 * client has to be left as it is, temporary information 845 * should never override any already known client state 846 * 2) the global client is a temporary client: purge the 847 * originator list and add the new one orig_entry 848 */ 849 if (flags & BATADV_TT_CLIENT_TEMP) { 850 if (!(common->flags & BATADV_TT_CLIENT_TEMP)) 851 goto out; 852 if (batadv_tt_global_entry_has_orig(tt_global_entry, 853 orig_node)) 854 goto out_remove; 855 batadv_tt_global_del_orig_list(tt_global_entry); 856 goto add_orig_entry; 857 } 858 859 /* if the client was temporary added before receiving the first 860 * OGM announcing it, we have to clear the TEMP flag 861 */ 862 common->flags &= ~BATADV_TT_CLIENT_TEMP; 863 864 /* the change can carry possible "attribute" flags like the 865 * TT_CLIENT_WIFI, therefore they have to be copied in the 866 * client entry 867 */ 868 tt_global_entry->common.flags |= flags; 869 870 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only 871 * one originator left in the list and we previously received a 872 * delete + roaming change for this originator. 873 * 874 * We should first delete the old originator before adding the 875 * new one. 876 */ 877 if (common->flags & BATADV_TT_CLIENT_ROAM) { 878 batadv_tt_global_del_orig_list(tt_global_entry); 879 common->flags &= ~BATADV_TT_CLIENT_ROAM; 880 tt_global_entry->roam_at = 0; 881 } 882 } 883 add_orig_entry: 884 /* add the new orig_entry (if needed) or update it */ 885 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn); 886 887 batadv_dbg(BATADV_DBG_TT, bat_priv, 888 "Creating new global tt entry: %pM (via %pM)\n", 889 common->addr, orig_node->orig); 890 ret = 1; 891 892 out_remove: 893 894 /* remove address from local hash if present */ 895 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, 896 "global tt received", 897 !!(flags & BATADV_TT_CLIENT_ROAM)); 898 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI; 899 900 if (!(flags & BATADV_TT_CLIENT_ROAM)) 901 /* this is a normal global add. Therefore the client is not in a 902 * roaming state anymore. 903 */ 904 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; 905 906 out: 907 if (tt_global_entry) 908 batadv_tt_global_entry_free_ref(tt_global_entry); 909 if (tt_local_entry) 910 batadv_tt_local_entry_free_ref(tt_local_entry); 911 return ret; 912 } 913 914 /* batadv_transtable_best_orig - Get best originator list entry from tt entry 915 * @tt_global_entry: global translation table entry to be analyzed 916 * 917 * This functon assumes the caller holds rcu_read_lock(). 918 * Returns best originator list entry or NULL on errors. 919 */ 920 static struct batadv_tt_orig_list_entry * 921 batadv_transtable_best_orig(struct batadv_tt_global_entry *tt_global_entry) 922 { 923 struct batadv_neigh_node *router = NULL; 924 struct hlist_head *head; 925 struct hlist_node *node; 926 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL; 927 int best_tq = 0; 928 929 head = &tt_global_entry->orig_list; 930 hlist_for_each_entry_rcu(orig_entry, node, head, list) { 931 router = batadv_orig_node_get_router(orig_entry->orig_node); 932 if (!router) 933 continue; 934 935 if (router->tq_avg > best_tq) { 936 best_entry = orig_entry; 937 best_tq = router->tq_avg; 938 } 939 940 batadv_neigh_node_free_ref(router); 941 } 942 943 return best_entry; 944 } 945 946 /* batadv_tt_global_print_entry - print all orig nodes who announce the address 947 * for this global entry 948 * @tt_global_entry: global translation table entry to be printed 949 * @seq: debugfs table seq_file struct 950 * 951 * This functon assumes the caller holds rcu_read_lock(). 952 */ 953 static void 954 batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry, 955 struct seq_file *seq) 956 { 957 struct hlist_head *head; 958 struct hlist_node *node; 959 struct batadv_tt_orig_list_entry *orig_entry, *best_entry; 960 struct batadv_tt_common_entry *tt_common_entry; 961 uint16_t flags; 962 uint8_t last_ttvn; 963 964 tt_common_entry = &tt_global_entry->common; 965 flags = tt_common_entry->flags; 966 967 best_entry = batadv_transtable_best_orig(tt_global_entry); 968 if (best_entry) { 969 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn); 970 seq_printf(seq, " %c %pM (%3u) via %pM (%3u) [%c%c%c]\n", 971 '*', tt_global_entry->common.addr, 972 best_entry->ttvn, best_entry->orig_node->orig, 973 last_ttvn, 974 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), 975 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), 976 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); 977 } 978 979 head = &tt_global_entry->orig_list; 980 981 hlist_for_each_entry_rcu(orig_entry, node, head, list) { 982 if (best_entry == orig_entry) 983 continue; 984 985 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); 986 seq_printf(seq, " %c %pM (%3u) via %pM (%3u) [%c%c%c]\n", 987 '+', tt_global_entry->common.addr, 988 orig_entry->ttvn, orig_entry->orig_node->orig, 989 last_ttvn, 990 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), 991 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), 992 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); 993 } 994 } 995 996 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) 997 { 998 struct net_device *net_dev = (struct net_device *)seq->private; 999 struct batadv_priv *bat_priv = netdev_priv(net_dev); 1000 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 1001 struct batadv_tt_common_entry *tt_common_entry; 1002 struct batadv_tt_global_entry *tt_global; 1003 struct batadv_hard_iface *primary_if; 1004 struct hlist_node *node; 1005 struct hlist_head *head; 1006 uint32_t i; 1007 1008 primary_if = batadv_seq_print_text_primary_if_get(seq); 1009 if (!primary_if) 1010 goto out; 1011 1012 seq_printf(seq, 1013 "Globally announced TT entries received via the mesh %s\n", 1014 net_dev->name); 1015 seq_printf(seq, " %-13s %s %-15s %s %s\n", 1016 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); 1017 1018 for (i = 0; i < hash->size; i++) { 1019 head = &hash->table[i]; 1020 1021 rcu_read_lock(); 1022 hlist_for_each_entry_rcu(tt_common_entry, node, 1023 head, hash_entry) { 1024 tt_global = container_of(tt_common_entry, 1025 struct batadv_tt_global_entry, 1026 common); 1027 batadv_tt_global_print_entry(tt_global, seq); 1028 } 1029 rcu_read_unlock(); 1030 } 1031 out: 1032 if (primary_if) 1033 batadv_hardif_free_ref(primary_if); 1034 return 0; 1035 } 1036 1037 /* deletes the orig list of a tt_global_entry */ 1038 static void 1039 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) 1040 { 1041 struct hlist_head *head; 1042 struct hlist_node *node, *safe; 1043 struct batadv_tt_orig_list_entry *orig_entry; 1044 1045 spin_lock_bh(&tt_global_entry->list_lock); 1046 head = &tt_global_entry->orig_list; 1047 hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { 1048 hlist_del_rcu(node); 1049 batadv_tt_orig_list_entry_free_ref(orig_entry); 1050 } 1051 spin_unlock_bh(&tt_global_entry->list_lock); 1052 1053 } 1054 1055 static void 1056 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, 1057 struct batadv_tt_global_entry *tt_global_entry, 1058 struct batadv_orig_node *orig_node, 1059 const char *message) 1060 { 1061 struct hlist_head *head; 1062 struct hlist_node *node, *safe; 1063 struct batadv_tt_orig_list_entry *orig_entry; 1064 1065 spin_lock_bh(&tt_global_entry->list_lock); 1066 head = &tt_global_entry->orig_list; 1067 hlist_for_each_entry_safe(orig_entry, node, safe, head, list) { 1068 if (orig_entry->orig_node == orig_node) { 1069 batadv_dbg(BATADV_DBG_TT, bat_priv, 1070 "Deleting %pM from global tt entry %pM: %s\n", 1071 orig_node->orig, 1072 tt_global_entry->common.addr, message); 1073 hlist_del_rcu(node); 1074 batadv_tt_orig_list_entry_free_ref(orig_entry); 1075 } 1076 } 1077 spin_unlock_bh(&tt_global_entry->list_lock); 1078 } 1079 1080 /* If the client is to be deleted, we check if it is the last origantor entry 1081 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the 1082 * timer, otherwise we simply remove the originator scheduled for deletion. 1083 */ 1084 static void 1085 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, 1086 struct batadv_tt_global_entry *tt_global_entry, 1087 struct batadv_orig_node *orig_node, 1088 const char *message) 1089 { 1090 bool last_entry = true; 1091 struct hlist_head *head; 1092 struct hlist_node *node; 1093 struct batadv_tt_orig_list_entry *orig_entry; 1094 1095 /* no local entry exists, case 1: 1096 * Check if this is the last one or if other entries exist. 1097 */ 1098 1099 rcu_read_lock(); 1100 head = &tt_global_entry->orig_list; 1101 hlist_for_each_entry_rcu(orig_entry, node, head, list) { 1102 if (orig_entry->orig_node != orig_node) { 1103 last_entry = false; 1104 break; 1105 } 1106 } 1107 rcu_read_unlock(); 1108 1109 if (last_entry) { 1110 /* its the last one, mark for roaming. */ 1111 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; 1112 tt_global_entry->roam_at = jiffies; 1113 } else 1114 /* there is another entry, we can simply delete this 1115 * one and can still use the other one. 1116 */ 1117 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, 1118 orig_node, message); 1119 } 1120 1121 1122 1123 static void batadv_tt_global_del(struct batadv_priv *bat_priv, 1124 struct batadv_orig_node *orig_node, 1125 const unsigned char *addr, 1126 const char *message, bool roaming) 1127 { 1128 struct batadv_tt_global_entry *tt_global_entry; 1129 struct batadv_tt_local_entry *local_entry = NULL; 1130 1131 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); 1132 if (!tt_global_entry) 1133 goto out; 1134 1135 if (!roaming) { 1136 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, 1137 orig_node, message); 1138 1139 if (hlist_empty(&tt_global_entry->orig_list)) 1140 batadv_tt_global_free(bat_priv, tt_global_entry, 1141 message); 1142 1143 goto out; 1144 } 1145 1146 /* if we are deleting a global entry due to a roam 1147 * event, there are two possibilities: 1148 * 1) the client roamed from node A to node B => if there 1149 * is only one originator left for this client, we mark 1150 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we 1151 * wait for node B to claim it. In case of timeout 1152 * the entry is purged. 1153 * 1154 * If there are other originators left, we directly delete 1155 * the originator. 1156 * 2) the client roamed to us => we can directly delete 1157 * the global entry, since it is useless now. 1158 */ 1159 local_entry = batadv_tt_local_hash_find(bat_priv, 1160 tt_global_entry->common.addr); 1161 if (local_entry) { 1162 /* local entry exists, case 2: client roamed to us. */ 1163 batadv_tt_global_del_orig_list(tt_global_entry); 1164 batadv_tt_global_free(bat_priv, tt_global_entry, message); 1165 } else 1166 /* no local entry exists, case 1: check for roaming */ 1167 batadv_tt_global_del_roaming(bat_priv, tt_global_entry, 1168 orig_node, message); 1169 1170 1171 out: 1172 if (tt_global_entry) 1173 batadv_tt_global_entry_free_ref(tt_global_entry); 1174 if (local_entry) 1175 batadv_tt_local_entry_free_ref(local_entry); 1176 } 1177 1178 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, 1179 struct batadv_orig_node *orig_node, 1180 const char *message) 1181 { 1182 struct batadv_tt_global_entry *tt_global; 1183 struct batadv_tt_common_entry *tt_common_entry; 1184 uint32_t i; 1185 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 1186 struct hlist_node *node, *safe; 1187 struct hlist_head *head; 1188 spinlock_t *list_lock; /* protects write access to the hash lists */ 1189 1190 if (!hash) 1191 return; 1192 1193 for (i = 0; i < hash->size; i++) { 1194 head = &hash->table[i]; 1195 list_lock = &hash->list_locks[i]; 1196 1197 spin_lock_bh(list_lock); 1198 hlist_for_each_entry_safe(tt_common_entry, node, safe, 1199 head, hash_entry) { 1200 tt_global = container_of(tt_common_entry, 1201 struct batadv_tt_global_entry, 1202 common); 1203 1204 batadv_tt_global_del_orig_entry(bat_priv, tt_global, 1205 orig_node, message); 1206 1207 if (hlist_empty(&tt_global->orig_list)) { 1208 batadv_dbg(BATADV_DBG_TT, bat_priv, 1209 "Deleting global tt entry %pM: %s\n", 1210 tt_global->common.addr, message); 1211 hlist_del_rcu(node); 1212 batadv_tt_global_entry_free_ref(tt_global); 1213 } 1214 } 1215 spin_unlock_bh(list_lock); 1216 } 1217 orig_node->tt_initialised = false; 1218 } 1219 1220 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global, 1221 char **msg) 1222 { 1223 bool purge = false; 1224 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT; 1225 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT; 1226 1227 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) && 1228 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) { 1229 purge = true; 1230 *msg = "Roaming timeout\n"; 1231 } 1232 1233 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) && 1234 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) { 1235 purge = true; 1236 *msg = "Temporary client timeout\n"; 1237 } 1238 1239 return purge; 1240 } 1241 1242 static void batadv_tt_global_purge(struct batadv_priv *bat_priv) 1243 { 1244 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 1245 struct hlist_head *head; 1246 struct hlist_node *node, *node_tmp; 1247 spinlock_t *list_lock; /* protects write access to the hash lists */ 1248 uint32_t i; 1249 char *msg = NULL; 1250 struct batadv_tt_common_entry *tt_common; 1251 struct batadv_tt_global_entry *tt_global; 1252 1253 for (i = 0; i < hash->size; i++) { 1254 head = &hash->table[i]; 1255 list_lock = &hash->list_locks[i]; 1256 1257 spin_lock_bh(list_lock); 1258 hlist_for_each_entry_safe(tt_common, node, node_tmp, head, 1259 hash_entry) { 1260 tt_global = container_of(tt_common, 1261 struct batadv_tt_global_entry, 1262 common); 1263 1264 if (!batadv_tt_global_to_purge(tt_global, &msg)) 1265 continue; 1266 1267 batadv_dbg(BATADV_DBG_TT, bat_priv, 1268 "Deleting global tt entry (%pM): %s\n", 1269 tt_global->common.addr, msg); 1270 1271 hlist_del_rcu(node); 1272 1273 batadv_tt_global_entry_free_ref(tt_global); 1274 } 1275 spin_unlock_bh(list_lock); 1276 } 1277 } 1278 1279 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) 1280 { 1281 struct batadv_hashtable *hash; 1282 spinlock_t *list_lock; /* protects write access to the hash lists */ 1283 struct batadv_tt_common_entry *tt_common_entry; 1284 struct batadv_tt_global_entry *tt_global; 1285 struct hlist_node *node, *node_tmp; 1286 struct hlist_head *head; 1287 uint32_t i; 1288 1289 if (!bat_priv->tt.global_hash) 1290 return; 1291 1292 hash = bat_priv->tt.global_hash; 1293 1294 for (i = 0; i < hash->size; i++) { 1295 head = &hash->table[i]; 1296 list_lock = &hash->list_locks[i]; 1297 1298 spin_lock_bh(list_lock); 1299 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, 1300 head, hash_entry) { 1301 hlist_del_rcu(node); 1302 tt_global = container_of(tt_common_entry, 1303 struct batadv_tt_global_entry, 1304 common); 1305 batadv_tt_global_entry_free_ref(tt_global); 1306 } 1307 spin_unlock_bh(list_lock); 1308 } 1309 1310 batadv_hash_destroy(hash); 1311 1312 bat_priv->tt.global_hash = NULL; 1313 } 1314 1315 static bool 1316 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, 1317 struct batadv_tt_global_entry *tt_global_entry) 1318 { 1319 bool ret = false; 1320 1321 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && 1322 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) 1323 ret = true; 1324 1325 return ret; 1326 } 1327 1328 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, 1329 const uint8_t *src, 1330 const uint8_t *addr) 1331 { 1332 struct batadv_tt_local_entry *tt_local_entry = NULL; 1333 struct batadv_tt_global_entry *tt_global_entry = NULL; 1334 struct batadv_orig_node *orig_node = NULL; 1335 struct batadv_tt_orig_list_entry *best_entry; 1336 1337 if (src && atomic_read(&bat_priv->ap_isolation)) { 1338 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); 1339 if (!tt_local_entry || 1340 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)) 1341 goto out; 1342 } 1343 1344 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); 1345 if (!tt_global_entry) 1346 goto out; 1347 1348 /* check whether the clients should not communicate due to AP 1349 * isolation 1350 */ 1351 if (tt_local_entry && 1352 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) 1353 goto out; 1354 1355 rcu_read_lock(); 1356 best_entry = batadv_transtable_best_orig(tt_global_entry); 1357 /* found anything? */ 1358 if (best_entry) 1359 orig_node = best_entry->orig_node; 1360 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) 1361 orig_node = NULL; 1362 rcu_read_unlock(); 1363 1364 out: 1365 if (tt_global_entry) 1366 batadv_tt_global_entry_free_ref(tt_global_entry); 1367 if (tt_local_entry) 1368 batadv_tt_local_entry_free_ref(tt_local_entry); 1369 1370 return orig_node; 1371 } 1372 1373 /* Calculates the checksum of the local table of a given orig_node */ 1374 static uint16_t batadv_tt_global_crc(struct batadv_priv *bat_priv, 1375 struct batadv_orig_node *orig_node) 1376 { 1377 uint16_t total = 0, total_one; 1378 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 1379 struct batadv_tt_common_entry *tt_common; 1380 struct batadv_tt_global_entry *tt_global; 1381 struct hlist_node *node; 1382 struct hlist_head *head; 1383 uint32_t i; 1384 int j; 1385 1386 for (i = 0; i < hash->size; i++) { 1387 head = &hash->table[i]; 1388 1389 rcu_read_lock(); 1390 hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) { 1391 tt_global = container_of(tt_common, 1392 struct batadv_tt_global_entry, 1393 common); 1394 /* Roaming clients are in the global table for 1395 * consistency only. They don't have to be 1396 * taken into account while computing the 1397 * global crc 1398 */ 1399 if (tt_common->flags & BATADV_TT_CLIENT_ROAM) 1400 continue; 1401 /* Temporary clients have not been announced yet, so 1402 * they have to be skipped while computing the global 1403 * crc 1404 */ 1405 if (tt_common->flags & BATADV_TT_CLIENT_TEMP) 1406 continue; 1407 1408 /* find out if this global entry is announced by this 1409 * originator 1410 */ 1411 if (!batadv_tt_global_entry_has_orig(tt_global, 1412 orig_node)) 1413 continue; 1414 1415 total_one = 0; 1416 for (j = 0; j < ETH_ALEN; j++) 1417 total_one = crc16_byte(total_one, 1418 tt_common->addr[j]); 1419 total ^= total_one; 1420 } 1421 rcu_read_unlock(); 1422 } 1423 1424 return total; 1425 } 1426 1427 /* Calculates the checksum of the local table */ 1428 static uint16_t batadv_tt_local_crc(struct batadv_priv *bat_priv) 1429 { 1430 uint16_t total = 0, total_one; 1431 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 1432 struct batadv_tt_common_entry *tt_common; 1433 struct hlist_node *node; 1434 struct hlist_head *head; 1435 uint32_t i; 1436 int j; 1437 1438 for (i = 0; i < hash->size; i++) { 1439 head = &hash->table[i]; 1440 1441 rcu_read_lock(); 1442 hlist_for_each_entry_rcu(tt_common, node, head, hash_entry) { 1443 /* not yet committed clients have not to be taken into 1444 * account while computing the CRC 1445 */ 1446 if (tt_common->flags & BATADV_TT_CLIENT_NEW) 1447 continue; 1448 total_one = 0; 1449 for (j = 0; j < ETH_ALEN; j++) 1450 total_one = crc16_byte(total_one, 1451 tt_common->addr[j]); 1452 total ^= total_one; 1453 } 1454 rcu_read_unlock(); 1455 } 1456 1457 return total; 1458 } 1459 1460 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) 1461 { 1462 struct batadv_tt_req_node *node, *safe; 1463 1464 spin_lock_bh(&bat_priv->tt.req_list_lock); 1465 1466 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { 1467 list_del(&node->list); 1468 kfree(node); 1469 } 1470 1471 spin_unlock_bh(&bat_priv->tt.req_list_lock); 1472 } 1473 1474 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, 1475 struct batadv_orig_node *orig_node, 1476 const unsigned char *tt_buff, 1477 uint8_t tt_num_changes) 1478 { 1479 uint16_t tt_buff_len = batadv_tt_len(tt_num_changes); 1480 1481 /* Replace the old buffer only if I received something in the 1482 * last OGM (the OGM could carry no changes) 1483 */ 1484 spin_lock_bh(&orig_node->tt_buff_lock); 1485 if (tt_buff_len > 0) { 1486 kfree(orig_node->tt_buff); 1487 orig_node->tt_buff_len = 0; 1488 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); 1489 if (orig_node->tt_buff) { 1490 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); 1491 orig_node->tt_buff_len = tt_buff_len; 1492 } 1493 } 1494 spin_unlock_bh(&orig_node->tt_buff_lock); 1495 } 1496 1497 static void batadv_tt_req_purge(struct batadv_priv *bat_priv) 1498 { 1499 struct batadv_tt_req_node *node, *safe; 1500 1501 spin_lock_bh(&bat_priv->tt.req_list_lock); 1502 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { 1503 if (batadv_has_timed_out(node->issued_at, 1504 BATADV_TT_REQUEST_TIMEOUT)) { 1505 list_del(&node->list); 1506 kfree(node); 1507 } 1508 } 1509 spin_unlock_bh(&bat_priv->tt.req_list_lock); 1510 } 1511 1512 /* returns the pointer to the new tt_req_node struct if no request 1513 * has already been issued for this orig_node, NULL otherwise 1514 */ 1515 static struct batadv_tt_req_node * 1516 batadv_new_tt_req_node(struct batadv_priv *bat_priv, 1517 struct batadv_orig_node *orig_node) 1518 { 1519 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; 1520 1521 spin_lock_bh(&bat_priv->tt.req_list_lock); 1522 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { 1523 if (batadv_compare_eth(tt_req_node_tmp, orig_node) && 1524 !batadv_has_timed_out(tt_req_node_tmp->issued_at, 1525 BATADV_TT_REQUEST_TIMEOUT)) 1526 goto unlock; 1527 } 1528 1529 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); 1530 if (!tt_req_node) 1531 goto unlock; 1532 1533 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); 1534 tt_req_node->issued_at = jiffies; 1535 1536 list_add(&tt_req_node->list, &bat_priv->tt.req_list); 1537 unlock: 1538 spin_unlock_bh(&bat_priv->tt.req_list_lock); 1539 return tt_req_node; 1540 } 1541 1542 /* data_ptr is useless here, but has to be kept to respect the prototype */ 1543 static int batadv_tt_local_valid_entry(const void *entry_ptr, 1544 const void *data_ptr) 1545 { 1546 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; 1547 1548 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) 1549 return 0; 1550 return 1; 1551 } 1552 1553 static int batadv_tt_global_valid(const void *entry_ptr, 1554 const void *data_ptr) 1555 { 1556 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; 1557 const struct batadv_tt_global_entry *tt_global_entry; 1558 const struct batadv_orig_node *orig_node = data_ptr; 1559 1560 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM || 1561 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP) 1562 return 0; 1563 1564 tt_global_entry = container_of(tt_common_entry, 1565 struct batadv_tt_global_entry, 1566 common); 1567 1568 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node); 1569 } 1570 1571 static struct sk_buff * 1572 batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, 1573 struct batadv_hashtable *hash, 1574 struct batadv_hard_iface *primary_if, 1575 int (*valid_cb)(const void *, const void *), 1576 void *cb_data) 1577 { 1578 struct batadv_tt_common_entry *tt_common_entry; 1579 struct batadv_tt_query_packet *tt_response; 1580 struct batadv_tt_change *tt_change; 1581 struct hlist_node *node; 1582 struct hlist_head *head; 1583 struct sk_buff *skb = NULL; 1584 uint16_t tt_tot, tt_count; 1585 ssize_t tt_query_size = sizeof(struct batadv_tt_query_packet); 1586 uint32_t i; 1587 size_t len; 1588 1589 if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { 1590 tt_len = primary_if->soft_iface->mtu - tt_query_size; 1591 tt_len -= tt_len % sizeof(struct batadv_tt_change); 1592 } 1593 tt_tot = tt_len / sizeof(struct batadv_tt_change); 1594 1595 len = tt_query_size + tt_len; 1596 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN); 1597 if (!skb) 1598 goto out; 1599 1600 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); 1601 tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len); 1602 tt_response->ttvn = ttvn; 1603 1604 tt_change = (struct batadv_tt_change *)(skb->data + tt_query_size); 1605 tt_count = 0; 1606 1607 rcu_read_lock(); 1608 for (i = 0; i < hash->size; i++) { 1609 head = &hash->table[i]; 1610 1611 hlist_for_each_entry_rcu(tt_common_entry, node, 1612 head, hash_entry) { 1613 if (tt_count == tt_tot) 1614 break; 1615 1616 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) 1617 continue; 1618 1619 memcpy(tt_change->addr, tt_common_entry->addr, 1620 ETH_ALEN); 1621 tt_change->flags = tt_common_entry->flags; 1622 1623 tt_count++; 1624 tt_change++; 1625 } 1626 } 1627 rcu_read_unlock(); 1628 1629 /* store in the message the number of entries we have successfully 1630 * copied 1631 */ 1632 tt_response->tt_data = htons(tt_count); 1633 1634 out: 1635 return skb; 1636 } 1637 1638 static int batadv_send_tt_request(struct batadv_priv *bat_priv, 1639 struct batadv_orig_node *dst_orig_node, 1640 uint8_t ttvn, uint16_t tt_crc, 1641 bool full_table) 1642 { 1643 struct sk_buff *skb = NULL; 1644 struct batadv_tt_query_packet *tt_request; 1645 struct batadv_hard_iface *primary_if; 1646 struct batadv_tt_req_node *tt_req_node = NULL; 1647 int ret = 1; 1648 size_t tt_req_len; 1649 1650 primary_if = batadv_primary_if_get_selected(bat_priv); 1651 if (!primary_if) 1652 goto out; 1653 1654 /* The new tt_req will be issued only if I'm not waiting for a 1655 * reply from the same orig_node yet 1656 */ 1657 tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node); 1658 if (!tt_req_node) 1659 goto out; 1660 1661 skb = dev_alloc_skb(sizeof(*tt_request) + ETH_HLEN + NET_IP_ALIGN); 1662 if (!skb) 1663 goto out; 1664 1665 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); 1666 1667 tt_req_len = sizeof(*tt_request); 1668 tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len); 1669 1670 tt_request->header.packet_type = BATADV_TT_QUERY; 1671 tt_request->header.version = BATADV_COMPAT_VERSION; 1672 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); 1673 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); 1674 tt_request->header.ttl = BATADV_TTL; 1675 tt_request->ttvn = ttvn; 1676 tt_request->tt_data = htons(tt_crc); 1677 tt_request->flags = BATADV_TT_REQUEST; 1678 1679 if (full_table) 1680 tt_request->flags |= BATADV_TT_FULL_TABLE; 1681 1682 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n", 1683 dst_orig_node->orig, (full_table ? 'F' : '.')); 1684 1685 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); 1686 1687 if (batadv_send_skb_to_orig(skb, dst_orig_node, NULL)) 1688 ret = 0; 1689 1690 out: 1691 if (primary_if) 1692 batadv_hardif_free_ref(primary_if); 1693 if (ret) 1694 kfree_skb(skb); 1695 if (ret && tt_req_node) { 1696 spin_lock_bh(&bat_priv->tt.req_list_lock); 1697 list_del(&tt_req_node->list); 1698 spin_unlock_bh(&bat_priv->tt.req_list_lock); 1699 kfree(tt_req_node); 1700 } 1701 return ret; 1702 } 1703 1704 static bool 1705 batadv_send_other_tt_response(struct batadv_priv *bat_priv, 1706 struct batadv_tt_query_packet *tt_request) 1707 { 1708 struct batadv_orig_node *req_dst_orig_node; 1709 struct batadv_orig_node *res_dst_orig_node = NULL; 1710 struct batadv_hard_iface *primary_if = NULL; 1711 uint8_t orig_ttvn, req_ttvn, ttvn; 1712 int ret = false; 1713 unsigned char *tt_buff; 1714 bool full_table; 1715 uint16_t tt_len, tt_tot; 1716 struct sk_buff *skb = NULL; 1717 struct batadv_tt_query_packet *tt_response; 1718 uint8_t *packet_pos; 1719 size_t len; 1720 1721 batadv_dbg(BATADV_DBG_TT, bat_priv, 1722 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", 1723 tt_request->src, tt_request->ttvn, tt_request->dst, 1724 (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); 1725 1726 /* Let's get the orig node of the REAL destination */ 1727 req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst); 1728 if (!req_dst_orig_node) 1729 goto out; 1730 1731 res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); 1732 if (!res_dst_orig_node) 1733 goto out; 1734 1735 primary_if = batadv_primary_if_get_selected(bat_priv); 1736 if (!primary_if) 1737 goto out; 1738 1739 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); 1740 req_ttvn = tt_request->ttvn; 1741 1742 /* I don't have the requested data */ 1743 if (orig_ttvn != req_ttvn || 1744 tt_request->tt_data != htons(req_dst_orig_node->tt_crc)) 1745 goto out; 1746 1747 /* If the full table has been explicitly requested */ 1748 if (tt_request->flags & BATADV_TT_FULL_TABLE || 1749 !req_dst_orig_node->tt_buff) 1750 full_table = true; 1751 else 1752 full_table = false; 1753 1754 /* In this version, fragmentation is not implemented, then 1755 * I'll send only one packet with as much TT entries as I can 1756 */ 1757 if (!full_table) { 1758 spin_lock_bh(&req_dst_orig_node->tt_buff_lock); 1759 tt_len = req_dst_orig_node->tt_buff_len; 1760 tt_tot = tt_len / sizeof(struct batadv_tt_change); 1761 1762 len = sizeof(*tt_response) + tt_len; 1763 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN); 1764 if (!skb) 1765 goto unlock; 1766 1767 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); 1768 packet_pos = skb_put(skb, len); 1769 tt_response = (struct batadv_tt_query_packet *)packet_pos; 1770 tt_response->ttvn = req_ttvn; 1771 tt_response->tt_data = htons(tt_tot); 1772 1773 tt_buff = skb->data + sizeof(*tt_response); 1774 /* Copy the last orig_node's OGM buffer */ 1775 memcpy(tt_buff, req_dst_orig_node->tt_buff, 1776 req_dst_orig_node->tt_buff_len); 1777 1778 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); 1779 } else { 1780 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size); 1781 tt_len *= sizeof(struct batadv_tt_change); 1782 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); 1783 1784 skb = batadv_tt_response_fill_table(tt_len, ttvn, 1785 bat_priv->tt.global_hash, 1786 primary_if, 1787 batadv_tt_global_valid, 1788 req_dst_orig_node); 1789 if (!skb) 1790 goto out; 1791 1792 tt_response = (struct batadv_tt_query_packet *)skb->data; 1793 } 1794 1795 tt_response->header.packet_type = BATADV_TT_QUERY; 1796 tt_response->header.version = BATADV_COMPAT_VERSION; 1797 tt_response->header.ttl = BATADV_TTL; 1798 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); 1799 memcpy(tt_response->dst, tt_request->src, ETH_ALEN); 1800 tt_response->flags = BATADV_TT_RESPONSE; 1801 1802 if (full_table) 1803 tt_response->flags |= BATADV_TT_FULL_TABLE; 1804 1805 batadv_dbg(BATADV_DBG_TT, bat_priv, 1806 "Sending TT_RESPONSE %pM for %pM (ttvn: %u)\n", 1807 res_dst_orig_node->orig, req_dst_orig_node->orig, req_ttvn); 1808 1809 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); 1810 1811 if (batadv_send_skb_to_orig(skb, res_dst_orig_node, NULL)) 1812 ret = true; 1813 goto out; 1814 1815 unlock: 1816 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); 1817 1818 out: 1819 if (res_dst_orig_node) 1820 batadv_orig_node_free_ref(res_dst_orig_node); 1821 if (req_dst_orig_node) 1822 batadv_orig_node_free_ref(req_dst_orig_node); 1823 if (primary_if) 1824 batadv_hardif_free_ref(primary_if); 1825 if (!ret) 1826 kfree_skb(skb); 1827 return ret; 1828 1829 } 1830 1831 static bool 1832 batadv_send_my_tt_response(struct batadv_priv *bat_priv, 1833 struct batadv_tt_query_packet *tt_request) 1834 { 1835 struct batadv_orig_node *orig_node; 1836 struct batadv_hard_iface *primary_if = NULL; 1837 uint8_t my_ttvn, req_ttvn, ttvn; 1838 int ret = false; 1839 unsigned char *tt_buff; 1840 bool full_table; 1841 uint16_t tt_len, tt_tot; 1842 struct sk_buff *skb = NULL; 1843 struct batadv_tt_query_packet *tt_response; 1844 uint8_t *packet_pos; 1845 size_t len; 1846 1847 batadv_dbg(BATADV_DBG_TT, bat_priv, 1848 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", 1849 tt_request->src, tt_request->ttvn, 1850 (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); 1851 1852 1853 my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); 1854 req_ttvn = tt_request->ttvn; 1855 1856 orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); 1857 if (!orig_node) 1858 goto out; 1859 1860 primary_if = batadv_primary_if_get_selected(bat_priv); 1861 if (!primary_if) 1862 goto out; 1863 1864 /* If the full table has been explicitly requested or the gap 1865 * is too big send the whole local translation table 1866 */ 1867 if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || 1868 !bat_priv->tt.last_changeset) 1869 full_table = true; 1870 else 1871 full_table = false; 1872 1873 /* In this version, fragmentation is not implemented, then 1874 * I'll send only one packet with as much TT entries as I can 1875 */ 1876 if (!full_table) { 1877 spin_lock_bh(&bat_priv->tt.last_changeset_lock); 1878 tt_len = bat_priv->tt.last_changeset_len; 1879 tt_tot = tt_len / sizeof(struct batadv_tt_change); 1880 1881 len = sizeof(*tt_response) + tt_len; 1882 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN); 1883 if (!skb) 1884 goto unlock; 1885 1886 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); 1887 packet_pos = skb_put(skb, len); 1888 tt_response = (struct batadv_tt_query_packet *)packet_pos; 1889 tt_response->ttvn = req_ttvn; 1890 tt_response->tt_data = htons(tt_tot); 1891 1892 tt_buff = skb->data + sizeof(*tt_response); 1893 memcpy(tt_buff, bat_priv->tt.last_changeset, 1894 bat_priv->tt.last_changeset_len); 1895 spin_unlock_bh(&bat_priv->tt.last_changeset_lock); 1896 } else { 1897 tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num); 1898 tt_len *= sizeof(struct batadv_tt_change); 1899 ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); 1900 1901 skb = batadv_tt_response_fill_table(tt_len, ttvn, 1902 bat_priv->tt.local_hash, 1903 primary_if, 1904 batadv_tt_local_valid_entry, 1905 NULL); 1906 if (!skb) 1907 goto out; 1908 1909 tt_response = (struct batadv_tt_query_packet *)skb->data; 1910 } 1911 1912 tt_response->header.packet_type = BATADV_TT_QUERY; 1913 tt_response->header.version = BATADV_COMPAT_VERSION; 1914 tt_response->header.ttl = BATADV_TTL; 1915 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); 1916 memcpy(tt_response->dst, tt_request->src, ETH_ALEN); 1917 tt_response->flags = BATADV_TT_RESPONSE; 1918 1919 if (full_table) 1920 tt_response->flags |= BATADV_TT_FULL_TABLE; 1921 1922 batadv_dbg(BATADV_DBG_TT, bat_priv, 1923 "Sending TT_RESPONSE to %pM [%c]\n", 1924 orig_node->orig, 1925 (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); 1926 1927 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); 1928 1929 if (batadv_send_skb_to_orig(skb, orig_node, NULL)) 1930 ret = true; 1931 goto out; 1932 1933 unlock: 1934 spin_unlock_bh(&bat_priv->tt.last_changeset_lock); 1935 out: 1936 if (orig_node) 1937 batadv_orig_node_free_ref(orig_node); 1938 if (primary_if) 1939 batadv_hardif_free_ref(primary_if); 1940 if (!ret) 1941 kfree_skb(skb); 1942 /* This packet was for me, so it doesn't need to be re-routed */ 1943 return true; 1944 } 1945 1946 bool batadv_send_tt_response(struct batadv_priv *bat_priv, 1947 struct batadv_tt_query_packet *tt_request) 1948 { 1949 if (batadv_is_my_mac(tt_request->dst)) { 1950 /* don't answer backbone gws! */ 1951 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src)) 1952 return true; 1953 1954 return batadv_send_my_tt_response(bat_priv, tt_request); 1955 } else { 1956 return batadv_send_other_tt_response(bat_priv, tt_request); 1957 } 1958 } 1959 1960 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, 1961 struct batadv_orig_node *orig_node, 1962 struct batadv_tt_change *tt_change, 1963 uint16_t tt_num_changes, uint8_t ttvn) 1964 { 1965 int i; 1966 int roams; 1967 1968 for (i = 0; i < tt_num_changes; i++) { 1969 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { 1970 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; 1971 batadv_tt_global_del(bat_priv, orig_node, 1972 (tt_change + i)->addr, 1973 "tt removed by changes", 1974 roams); 1975 } else { 1976 if (!batadv_tt_global_add(bat_priv, orig_node, 1977 (tt_change + i)->addr, 1978 (tt_change + i)->flags, ttvn)) 1979 /* In case of problem while storing a 1980 * global_entry, we stop the updating 1981 * procedure without committing the 1982 * ttvn change. This will avoid to send 1983 * corrupted data on tt_request 1984 */ 1985 return; 1986 } 1987 } 1988 orig_node->tt_initialised = true; 1989 } 1990 1991 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, 1992 struct batadv_tt_query_packet *tt_response) 1993 { 1994 struct batadv_orig_node *orig_node; 1995 1996 orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); 1997 if (!orig_node) 1998 goto out; 1999 2000 /* Purge the old table first.. */ 2001 batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); 2002 2003 _batadv_tt_update_changes(bat_priv, orig_node, 2004 (struct batadv_tt_change *)(tt_response + 1), 2005 ntohs(tt_response->tt_data), 2006 tt_response->ttvn); 2007 2008 spin_lock_bh(&orig_node->tt_buff_lock); 2009 kfree(orig_node->tt_buff); 2010 orig_node->tt_buff_len = 0; 2011 orig_node->tt_buff = NULL; 2012 spin_unlock_bh(&orig_node->tt_buff_lock); 2013 2014 atomic_set(&orig_node->last_ttvn, tt_response->ttvn); 2015 2016 out: 2017 if (orig_node) 2018 batadv_orig_node_free_ref(orig_node); 2019 } 2020 2021 static void batadv_tt_update_changes(struct batadv_priv *bat_priv, 2022 struct batadv_orig_node *orig_node, 2023 uint16_t tt_num_changes, uint8_t ttvn, 2024 struct batadv_tt_change *tt_change) 2025 { 2026 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, 2027 tt_num_changes, ttvn); 2028 2029 batadv_tt_save_orig_buffer(bat_priv, orig_node, 2030 (unsigned char *)tt_change, tt_num_changes); 2031 atomic_set(&orig_node->last_ttvn, ttvn); 2032 } 2033 2034 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr) 2035 { 2036 struct batadv_tt_local_entry *tt_local_entry; 2037 bool ret = false; 2038 2039 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); 2040 if (!tt_local_entry) 2041 goto out; 2042 /* Check if the client has been logically deleted (but is kept for 2043 * consistency purpose) 2044 */ 2045 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) || 2046 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM)) 2047 goto out; 2048 ret = true; 2049 out: 2050 if (tt_local_entry) 2051 batadv_tt_local_entry_free_ref(tt_local_entry); 2052 return ret; 2053 } 2054 2055 void batadv_handle_tt_response(struct batadv_priv *bat_priv, 2056 struct batadv_tt_query_packet *tt_response) 2057 { 2058 struct batadv_tt_req_node *node, *safe; 2059 struct batadv_orig_node *orig_node = NULL; 2060 struct batadv_tt_change *tt_change; 2061 2062 batadv_dbg(BATADV_DBG_TT, bat_priv, 2063 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", 2064 tt_response->src, tt_response->ttvn, 2065 ntohs(tt_response->tt_data), 2066 (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); 2067 2068 /* we should have never asked a backbone gw */ 2069 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src)) 2070 goto out; 2071 2072 orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); 2073 if (!orig_node) 2074 goto out; 2075 2076 if (tt_response->flags & BATADV_TT_FULL_TABLE) { 2077 batadv_tt_fill_gtable(bat_priv, tt_response); 2078 } else { 2079 tt_change = (struct batadv_tt_change *)(tt_response + 1); 2080 batadv_tt_update_changes(bat_priv, orig_node, 2081 ntohs(tt_response->tt_data), 2082 tt_response->ttvn, tt_change); 2083 } 2084 2085 /* Delete the tt_req_node from pending tt_requests list */ 2086 spin_lock_bh(&bat_priv->tt.req_list_lock); 2087 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { 2088 if (!batadv_compare_eth(node->addr, tt_response->src)) 2089 continue; 2090 list_del(&node->list); 2091 kfree(node); 2092 } 2093 spin_unlock_bh(&bat_priv->tt.req_list_lock); 2094 2095 /* Recalculate the CRC for this orig_node and store it */ 2096 orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); 2097 out: 2098 if (orig_node) 2099 batadv_orig_node_free_ref(orig_node); 2100 } 2101 2102 int batadv_tt_init(struct batadv_priv *bat_priv) 2103 { 2104 int ret; 2105 2106 ret = batadv_tt_local_init(bat_priv); 2107 if (ret < 0) 2108 return ret; 2109 2110 ret = batadv_tt_global_init(bat_priv); 2111 if (ret < 0) 2112 return ret; 2113 2114 batadv_tt_start_timer(bat_priv); 2115 2116 return 1; 2117 } 2118 2119 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) 2120 { 2121 struct batadv_tt_roam_node *node, *safe; 2122 2123 spin_lock_bh(&bat_priv->tt.roam_list_lock); 2124 2125 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { 2126 list_del(&node->list); 2127 kfree(node); 2128 } 2129 2130 spin_unlock_bh(&bat_priv->tt.roam_list_lock); 2131 } 2132 2133 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) 2134 { 2135 struct batadv_tt_roam_node *node, *safe; 2136 2137 spin_lock_bh(&bat_priv->tt.roam_list_lock); 2138 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { 2139 if (!batadv_has_timed_out(node->first_time, 2140 BATADV_ROAMING_MAX_TIME)) 2141 continue; 2142 2143 list_del(&node->list); 2144 kfree(node); 2145 } 2146 spin_unlock_bh(&bat_priv->tt.roam_list_lock); 2147 } 2148 2149 /* This function checks whether the client already reached the 2150 * maximum number of possible roaming phases. In this case the ROAMING_ADV 2151 * will not be sent. 2152 * 2153 * returns true if the ROAMING_ADV can be sent, false otherwise 2154 */ 2155 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, 2156 uint8_t *client) 2157 { 2158 struct batadv_tt_roam_node *tt_roam_node; 2159 bool ret = false; 2160 2161 spin_lock_bh(&bat_priv->tt.roam_list_lock); 2162 /* The new tt_req will be issued only if I'm not waiting for a 2163 * reply from the same orig_node yet 2164 */ 2165 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) { 2166 if (!batadv_compare_eth(tt_roam_node->addr, client)) 2167 continue; 2168 2169 if (batadv_has_timed_out(tt_roam_node->first_time, 2170 BATADV_ROAMING_MAX_TIME)) 2171 continue; 2172 2173 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) 2174 /* Sorry, you roamed too many times! */ 2175 goto unlock; 2176 ret = true; 2177 break; 2178 } 2179 2180 if (!ret) { 2181 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); 2182 if (!tt_roam_node) 2183 goto unlock; 2184 2185 tt_roam_node->first_time = jiffies; 2186 atomic_set(&tt_roam_node->counter, 2187 BATADV_ROAMING_MAX_COUNT - 1); 2188 memcpy(tt_roam_node->addr, client, ETH_ALEN); 2189 2190 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list); 2191 ret = true; 2192 } 2193 2194 unlock: 2195 spin_unlock_bh(&bat_priv->tt.roam_list_lock); 2196 return ret; 2197 } 2198 2199 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, 2200 struct batadv_orig_node *orig_node) 2201 { 2202 struct sk_buff *skb = NULL; 2203 struct batadv_roam_adv_packet *roam_adv_packet; 2204 int ret = 1; 2205 struct batadv_hard_iface *primary_if; 2206 size_t len = sizeof(*roam_adv_packet); 2207 2208 /* before going on we have to check whether the client has 2209 * already roamed to us too many times 2210 */ 2211 if (!batadv_tt_check_roam_count(bat_priv, client)) 2212 goto out; 2213 2214 skb = dev_alloc_skb(sizeof(*roam_adv_packet) + ETH_HLEN + NET_IP_ALIGN); 2215 if (!skb) 2216 goto out; 2217 2218 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); 2219 2220 roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len); 2221 2222 roam_adv_packet->header.packet_type = BATADV_ROAM_ADV; 2223 roam_adv_packet->header.version = BATADV_COMPAT_VERSION; 2224 roam_adv_packet->header.ttl = BATADV_TTL; 2225 roam_adv_packet->reserved = 0; 2226 primary_if = batadv_primary_if_get_selected(bat_priv); 2227 if (!primary_if) 2228 goto out; 2229 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); 2230 batadv_hardif_free_ref(primary_if); 2231 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); 2232 memcpy(roam_adv_packet->client, client, ETH_ALEN); 2233 2234 batadv_dbg(BATADV_DBG_TT, bat_priv, 2235 "Sending ROAMING_ADV to %pM (client %pM)\n", 2236 orig_node->orig, client); 2237 2238 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); 2239 2240 if (batadv_send_skb_to_orig(skb, orig_node, NULL)) 2241 ret = 0; 2242 2243 out: 2244 if (ret && skb) 2245 kfree_skb(skb); 2246 return; 2247 } 2248 2249 static void batadv_tt_purge(struct work_struct *work) 2250 { 2251 struct delayed_work *delayed_work; 2252 struct batadv_priv_tt *priv_tt; 2253 struct batadv_priv *bat_priv; 2254 2255 delayed_work = container_of(work, struct delayed_work, work); 2256 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work); 2257 bat_priv = container_of(priv_tt, struct batadv_priv, tt); 2258 2259 batadv_tt_local_purge(bat_priv); 2260 batadv_tt_global_purge(bat_priv); 2261 batadv_tt_req_purge(bat_priv); 2262 batadv_tt_roam_purge(bat_priv); 2263 2264 batadv_tt_start_timer(bat_priv); 2265 } 2266 2267 void batadv_tt_free(struct batadv_priv *bat_priv) 2268 { 2269 cancel_delayed_work_sync(&bat_priv->tt.work); 2270 2271 batadv_tt_local_table_free(bat_priv); 2272 batadv_tt_global_table_free(bat_priv); 2273 batadv_tt_req_list_free(bat_priv); 2274 batadv_tt_changes_list_free(bat_priv); 2275 batadv_tt_roam_list_free(bat_priv); 2276 2277 kfree(bat_priv->tt.last_changeset); 2278 } 2279 2280 /* This function will enable or disable the specified flags for all the entries 2281 * in the given hash table and returns the number of modified entries 2282 */ 2283 static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash, 2284 uint16_t flags, bool enable) 2285 { 2286 uint32_t i; 2287 uint16_t changed_num = 0; 2288 struct hlist_head *head; 2289 struct hlist_node *node; 2290 struct batadv_tt_common_entry *tt_common_entry; 2291 2292 if (!hash) 2293 goto out; 2294 2295 for (i = 0; i < hash->size; i++) { 2296 head = &hash->table[i]; 2297 2298 rcu_read_lock(); 2299 hlist_for_each_entry_rcu(tt_common_entry, node, 2300 head, hash_entry) { 2301 if (enable) { 2302 if ((tt_common_entry->flags & flags) == flags) 2303 continue; 2304 tt_common_entry->flags |= flags; 2305 } else { 2306 if (!(tt_common_entry->flags & flags)) 2307 continue; 2308 tt_common_entry->flags &= ~flags; 2309 } 2310 changed_num++; 2311 } 2312 rcu_read_unlock(); 2313 } 2314 out: 2315 return changed_num; 2316 } 2317 2318 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ 2319 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) 2320 { 2321 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 2322 struct batadv_tt_common_entry *tt_common; 2323 struct batadv_tt_local_entry *tt_local; 2324 struct hlist_node *node, *node_tmp; 2325 struct hlist_head *head; 2326 spinlock_t *list_lock; /* protects write access to the hash lists */ 2327 uint32_t i; 2328 2329 if (!hash) 2330 return; 2331 2332 for (i = 0; i < hash->size; i++) { 2333 head = &hash->table[i]; 2334 list_lock = &hash->list_locks[i]; 2335 2336 spin_lock_bh(list_lock); 2337 hlist_for_each_entry_safe(tt_common, node, node_tmp, head, 2338 hash_entry) { 2339 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) 2340 continue; 2341 2342 batadv_dbg(BATADV_DBG_TT, bat_priv, 2343 "Deleting local tt entry (%pM): pending\n", 2344 tt_common->addr); 2345 2346 atomic_dec(&bat_priv->tt.local_entry_num); 2347 hlist_del_rcu(node); 2348 tt_local = container_of(tt_common, 2349 struct batadv_tt_local_entry, 2350 common); 2351 batadv_tt_local_entry_free_ref(tt_local); 2352 } 2353 spin_unlock_bh(list_lock); 2354 } 2355 2356 } 2357 2358 static int batadv_tt_commit_changes(struct batadv_priv *bat_priv, 2359 unsigned char **packet_buff, 2360 int *packet_buff_len, int packet_min_len) 2361 { 2362 uint16_t changed_num = 0; 2363 2364 if (atomic_read(&bat_priv->tt.local_changes) < 1) 2365 return -ENOENT; 2366 2367 changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash, 2368 BATADV_TT_CLIENT_NEW, false); 2369 2370 /* all reset entries have to be counted as local entries */ 2371 atomic_add(changed_num, &bat_priv->tt.local_entry_num); 2372 batadv_tt_local_purge_pending_clients(bat_priv); 2373 bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv); 2374 2375 /* Increment the TTVN only once per OGM interval */ 2376 atomic_inc(&bat_priv->tt.vn); 2377 batadv_dbg(BATADV_DBG_TT, bat_priv, 2378 "Local changes committed, updating to ttvn %u\n", 2379 (uint8_t)atomic_read(&bat_priv->tt.vn)); 2380 2381 /* reset the sending counter */ 2382 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); 2383 2384 return batadv_tt_changes_fill_buff(bat_priv, packet_buff, 2385 packet_buff_len, packet_min_len); 2386 } 2387 2388 /* when calling this function (hard_iface == primary_if) has to be true */ 2389 int batadv_tt_append_diff(struct batadv_priv *bat_priv, 2390 unsigned char **packet_buff, int *packet_buff_len, 2391 int packet_min_len) 2392 { 2393 int tt_num_changes; 2394 2395 /* if at least one change happened */ 2396 tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff, 2397 packet_buff_len, 2398 packet_min_len); 2399 2400 /* if the changes have been sent often enough */ 2401 if ((tt_num_changes < 0) && 2402 (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))) { 2403 batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, 2404 packet_min_len, packet_min_len); 2405 tt_num_changes = 0; 2406 } 2407 2408 return tt_num_changes; 2409 } 2410 2411 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src, 2412 uint8_t *dst) 2413 { 2414 struct batadv_tt_local_entry *tt_local_entry = NULL; 2415 struct batadv_tt_global_entry *tt_global_entry = NULL; 2416 bool ret = false; 2417 2418 if (!atomic_read(&bat_priv->ap_isolation)) 2419 goto out; 2420 2421 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst); 2422 if (!tt_local_entry) 2423 goto out; 2424 2425 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src); 2426 if (!tt_global_entry) 2427 goto out; 2428 2429 if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) 2430 goto out; 2431 2432 ret = true; 2433 2434 out: 2435 if (tt_global_entry) 2436 batadv_tt_global_entry_free_ref(tt_global_entry); 2437 if (tt_local_entry) 2438 batadv_tt_local_entry_free_ref(tt_local_entry); 2439 return ret; 2440 } 2441 2442 void batadv_tt_update_orig(struct batadv_priv *bat_priv, 2443 struct batadv_orig_node *orig_node, 2444 const unsigned char *tt_buff, uint8_t tt_num_changes, 2445 uint8_t ttvn, uint16_t tt_crc) 2446 { 2447 uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); 2448 bool full_table = true; 2449 struct batadv_tt_change *tt_change; 2450 2451 /* don't care about a backbone gateways updates. */ 2452 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) 2453 return; 2454 2455 /* orig table not initialised AND first diff is in the OGM OR the ttvn 2456 * increased by one -> we can apply the attached changes 2457 */ 2458 if ((!orig_node->tt_initialised && ttvn == 1) || 2459 ttvn - orig_ttvn == 1) { 2460 /* the OGM could not contain the changes due to their size or 2461 * because they have already been sent BATADV_TT_OGM_APPEND_MAX 2462 * times. 2463 * In this case send a tt request 2464 */ 2465 if (!tt_num_changes) { 2466 full_table = false; 2467 goto request_table; 2468 } 2469 2470 tt_change = (struct batadv_tt_change *)tt_buff; 2471 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, 2472 ttvn, tt_change); 2473 2474 /* Even if we received the precomputed crc with the OGM, we 2475 * prefer to recompute it to spot any possible inconsistency 2476 * in the global table 2477 */ 2478 orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); 2479 2480 /* The ttvn alone is not enough to guarantee consistency 2481 * because a single value could represent different states 2482 * (due to the wrap around). Thus a node has to check whether 2483 * the resulting table (after applying the changes) is still 2484 * consistent or not. E.g. a node could disconnect while its 2485 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case 2486 * checking the CRC value is mandatory to detect the 2487 * inconsistency 2488 */ 2489 if (orig_node->tt_crc != tt_crc) 2490 goto request_table; 2491 } else { 2492 /* if we missed more than one change or our tables are not 2493 * in sync anymore -> request fresh tt data 2494 */ 2495 if (!orig_node->tt_initialised || ttvn != orig_ttvn || 2496 orig_node->tt_crc != tt_crc) { 2497 request_table: 2498 batadv_dbg(BATADV_DBG_TT, bat_priv, 2499 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n", 2500 orig_node->orig, ttvn, orig_ttvn, tt_crc, 2501 orig_node->tt_crc, tt_num_changes); 2502 batadv_send_tt_request(bat_priv, orig_node, ttvn, 2503 tt_crc, full_table); 2504 return; 2505 } 2506 } 2507 } 2508 2509 /* returns true whether we know that the client has moved from its old 2510 * originator to another one. This entry is kept is still kept for consistency 2511 * purposes 2512 */ 2513 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, 2514 uint8_t *addr) 2515 { 2516 struct batadv_tt_global_entry *tt_global_entry; 2517 bool ret = false; 2518 2519 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); 2520 if (!tt_global_entry) 2521 goto out; 2522 2523 ret = !!(tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM); 2524 batadv_tt_global_entry_free_ref(tt_global_entry); 2525 out: 2526 return ret; 2527 } 2528 2529 /** 2530 * batadv_tt_local_client_is_roaming - tells whether the client is roaming 2531 * @bat_priv: the bat priv with all the soft interface information 2532 * @addr: the MAC address of the local client to query 2533 * 2534 * Returns true if the local client is known to be roaming (it is not served by 2535 * this node anymore) or not. If yes, the client is still present in the table 2536 * to keep the latter consistent with the node TTVN 2537 */ 2538 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv, 2539 uint8_t *addr) 2540 { 2541 struct batadv_tt_local_entry *tt_local_entry; 2542 bool ret = false; 2543 2544 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); 2545 if (!tt_local_entry) 2546 goto out; 2547 2548 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM; 2549 batadv_tt_local_entry_free_ref(tt_local_entry); 2550 out: 2551 return ret; 2552 2553 } 2554 2555 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, 2556 struct batadv_orig_node *orig_node, 2557 const unsigned char *addr) 2558 { 2559 bool ret = false; 2560 2561 /* if the originator is a backbone node (meaning it belongs to the same 2562 * LAN of this node) the temporary client must not be added because to 2563 * reach such destination the node must use the LAN instead of the mesh 2564 */ 2565 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) 2566 goto out; 2567 2568 if (!batadv_tt_global_add(bat_priv, orig_node, addr, 2569 BATADV_TT_CLIENT_TEMP, 2570 atomic_read(&orig_node->last_ttvn))) 2571 goto out; 2572 2573 batadv_dbg(BATADV_DBG_TT, bat_priv, 2574 "Added temporary global client (addr: %pM orig: %pM)\n", 2575 addr, orig_node->orig); 2576 ret = true; 2577 out: 2578 return ret; 2579 } 2580