1 /* Copyright (C) 2007-2013 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 /* hash class keys */ 33 static struct lock_class_key batadv_tt_local_hash_lock_class_key; 34 static struct lock_class_key batadv_tt_global_hash_lock_class_key; 35 36 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, 37 struct batadv_orig_node *orig_node); 38 static void batadv_tt_purge(struct work_struct *work); 39 static void 40 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry); 41 static void batadv_tt_global_del(struct batadv_priv *bat_priv, 42 struct batadv_orig_node *orig_node, 43 const unsigned char *addr, 44 const char *message, bool roaming); 45 46 /* returns 1 if they are the same mac addr */ 47 static int batadv_compare_tt(const struct hlist_node *node, const void *data2) 48 { 49 const void *data1 = container_of(node, struct batadv_tt_common_entry, 50 hash_entry); 51 52 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); 53 } 54 55 static struct batadv_tt_common_entry * 56 batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data) 57 { 58 struct hlist_head *head; 59 struct batadv_tt_common_entry *tt_common_entry; 60 struct batadv_tt_common_entry *tt_common_entry_tmp = NULL; 61 uint32_t index; 62 63 if (!hash) 64 return NULL; 65 66 index = batadv_choose_orig(data, hash->size); 67 head = &hash->table[index]; 68 69 rcu_read_lock(); 70 hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) { 71 if (!batadv_compare_eth(tt_common_entry, data)) 72 continue; 73 74 if (!atomic_inc_not_zero(&tt_common_entry->refcount)) 75 continue; 76 77 tt_common_entry_tmp = tt_common_entry; 78 break; 79 } 80 rcu_read_unlock(); 81 82 return tt_common_entry_tmp; 83 } 84 85 static struct batadv_tt_local_entry * 86 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data) 87 { 88 struct batadv_tt_common_entry *tt_common_entry; 89 struct batadv_tt_local_entry *tt_local_entry = NULL; 90 91 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data); 92 if (tt_common_entry) 93 tt_local_entry = container_of(tt_common_entry, 94 struct batadv_tt_local_entry, 95 common); 96 return tt_local_entry; 97 } 98 99 static struct batadv_tt_global_entry * 100 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data) 101 { 102 struct batadv_tt_common_entry *tt_common_entry; 103 struct batadv_tt_global_entry *tt_global_entry = NULL; 104 105 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data); 106 if (tt_common_entry) 107 tt_global_entry = container_of(tt_common_entry, 108 struct batadv_tt_global_entry, 109 common); 110 return tt_global_entry; 111 } 112 113 static void 114 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry) 115 { 116 if (atomic_dec_and_test(&tt_local_entry->common.refcount)) 117 kfree_rcu(tt_local_entry, common.rcu); 118 } 119 120 static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) 121 { 122 struct batadv_tt_common_entry *tt_common_entry; 123 struct batadv_tt_global_entry *tt_global_entry; 124 125 tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu); 126 tt_global_entry = container_of(tt_common_entry, 127 struct batadv_tt_global_entry, common); 128 129 kfree(tt_global_entry); 130 } 131 132 static void 133 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry) 134 { 135 if (atomic_dec_and_test(&tt_global_entry->common.refcount)) { 136 batadv_tt_global_del_orig_list(tt_global_entry); 137 call_rcu(&tt_global_entry->common.rcu, 138 batadv_tt_global_entry_free_rcu); 139 } 140 } 141 142 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) 143 { 144 struct batadv_tt_orig_list_entry *orig_entry; 145 146 orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu); 147 148 /* We are in an rcu callback here, therefore we cannot use 149 * batadv_orig_node_free_ref() and its call_rcu(): 150 * An rcu_barrier() wouldn't wait for that to finish 151 */ 152 batadv_orig_node_free_ref_now(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 batadv_hash_set_lock_class(bat_priv->tt.local_hash, 239 &batadv_tt_local_hash_lock_class_key); 240 241 return 0; 242 } 243 244 static void batadv_tt_global_free(struct batadv_priv *bat_priv, 245 struct batadv_tt_global_entry *tt_global, 246 const char *message) 247 { 248 batadv_dbg(BATADV_DBG_TT, bat_priv, 249 "Deleting global tt entry %pM: %s\n", 250 tt_global->common.addr, message); 251 252 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt, 253 batadv_choose_orig, tt_global->common.addr); 254 batadv_tt_global_entry_free_ref(tt_global); 255 } 256 257 void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, 258 int ifindex) 259 { 260 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 261 struct batadv_tt_local_entry *tt_local; 262 struct batadv_tt_global_entry *tt_global; 263 struct hlist_head *head; 264 struct batadv_tt_orig_list_entry *orig_entry; 265 int hash_added; 266 bool roamed_back = false; 267 268 tt_local = batadv_tt_local_hash_find(bat_priv, addr); 269 tt_global = batadv_tt_global_hash_find(bat_priv, addr); 270 271 if (tt_local) { 272 tt_local->last_seen = jiffies; 273 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) { 274 batadv_dbg(BATADV_DBG_TT, bat_priv, 275 "Re-adding pending client %pM\n", addr); 276 /* whatever the reason why the PENDING flag was set, 277 * this is a client which was enqueued to be removed in 278 * this orig_interval. Since it popped up again, the 279 * flag can be reset like it was never enqueued 280 */ 281 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING; 282 goto add_event; 283 } 284 285 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) { 286 batadv_dbg(BATADV_DBG_TT, bat_priv, 287 "Roaming client %pM came back to its original location\n", 288 addr); 289 /* the ROAM flag is set because this client roamed away 290 * and the node got a roaming_advertisement message. Now 291 * that the client popped up again at its original 292 * location such flag can be unset 293 */ 294 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM; 295 roamed_back = true; 296 } 297 goto check_roaming; 298 } 299 300 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC); 301 if (!tt_local) 302 goto out; 303 304 batadv_dbg(BATADV_DBG_TT, bat_priv, 305 "Creating new local tt entry: %pM (ttvn: %d)\n", addr, 306 (uint8_t)atomic_read(&bat_priv->tt.vn)); 307 308 memcpy(tt_local->common.addr, addr, ETH_ALEN); 309 /* The local entry has to be marked as NEW to avoid to send it in 310 * a full table response going out before the next ttvn increment 311 * (consistency check) 312 */ 313 tt_local->common.flags = BATADV_TT_CLIENT_NEW; 314 if (batadv_is_wifi_iface(ifindex)) 315 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; 316 atomic_set(&tt_local->common.refcount, 2); 317 tt_local->last_seen = jiffies; 318 tt_local->common.added_at = tt_local->last_seen; 319 320 /* the batman interface mac address should never be purged */ 321 if (batadv_compare_eth(addr, soft_iface->dev_addr)) 322 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE; 323 324 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt, 325 batadv_choose_orig, &tt_local->common, 326 &tt_local->common.hash_entry); 327 328 if (unlikely(hash_added != 0)) { 329 /* remove the reference for the hash */ 330 batadv_tt_local_entry_free_ref(tt_local); 331 goto out; 332 } 333 334 add_event: 335 batadv_tt_local_event(bat_priv, addr, tt_local->common.flags); 336 337 check_roaming: 338 /* Check whether it is a roaming, but don't do anything if the roaming 339 * process has already been handled 340 */ 341 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) { 342 /* These node are probably going to update their tt table */ 343 head = &tt_global->orig_list; 344 rcu_read_lock(); 345 hlist_for_each_entry_rcu(orig_entry, head, list) { 346 batadv_send_roam_adv(bat_priv, tt_global->common.addr, 347 orig_entry->orig_node); 348 } 349 rcu_read_unlock(); 350 if (roamed_back) { 351 batadv_tt_global_free(bat_priv, tt_global, 352 "Roaming canceled"); 353 tt_global = NULL; 354 } else { 355 /* The global entry has to be marked as ROAMING and 356 * has to be kept for consistency purpose 357 */ 358 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM; 359 tt_global->roam_at = jiffies; 360 } 361 } 362 363 out: 364 if (tt_local) 365 batadv_tt_local_entry_free_ref(tt_local); 366 if (tt_global) 367 batadv_tt_global_entry_free_ref(tt_global); 368 } 369 370 static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff, 371 int *packet_buff_len, 372 int min_packet_len, 373 int new_packet_len) 374 { 375 unsigned char *new_buff; 376 377 new_buff = kmalloc(new_packet_len, GFP_ATOMIC); 378 379 /* keep old buffer if kmalloc should fail */ 380 if (new_buff) { 381 memcpy(new_buff, *packet_buff, min_packet_len); 382 kfree(*packet_buff); 383 *packet_buff = new_buff; 384 *packet_buff_len = new_packet_len; 385 } 386 } 387 388 static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv, 389 unsigned char **packet_buff, 390 int *packet_buff_len, 391 int min_packet_len) 392 { 393 int req_len; 394 395 req_len = min_packet_len; 396 req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes)); 397 398 /* if we have too many changes for one packet don't send any 399 * and wait for the tt table request which will be fragmented 400 */ 401 if (req_len > bat_priv->soft_iface->mtu) 402 req_len = min_packet_len; 403 404 batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, 405 min_packet_len, req_len); 406 } 407 408 static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv, 409 unsigned char **packet_buff, 410 int *packet_buff_len, 411 int min_packet_len) 412 { 413 struct batadv_tt_change_node *entry, *safe; 414 int count = 0, tot_changes = 0, new_len; 415 unsigned char *tt_buff; 416 417 batadv_tt_prepare_packet_buff(bat_priv, packet_buff, 418 packet_buff_len, min_packet_len); 419 420 new_len = *packet_buff_len - min_packet_len; 421 tt_buff = *packet_buff + min_packet_len; 422 423 if (new_len > 0) 424 tot_changes = new_len / batadv_tt_len(1); 425 426 spin_lock_bh(&bat_priv->tt.changes_list_lock); 427 atomic_set(&bat_priv->tt.local_changes, 0); 428 429 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, 430 list) { 431 if (count < tot_changes) { 432 memcpy(tt_buff + batadv_tt_len(count), 433 &entry->change, sizeof(struct batadv_tt_change)); 434 count++; 435 } 436 list_del(&entry->list); 437 kfree(entry); 438 } 439 spin_unlock_bh(&bat_priv->tt.changes_list_lock); 440 441 /* Keep the buffer for possible tt_request */ 442 spin_lock_bh(&bat_priv->tt.last_changeset_lock); 443 kfree(bat_priv->tt.last_changeset); 444 bat_priv->tt.last_changeset_len = 0; 445 bat_priv->tt.last_changeset = NULL; 446 /* check whether this new OGM has no changes due to size problems */ 447 if (new_len > 0) { 448 /* if kmalloc() fails we will reply with the full table 449 * instead of providing the diff 450 */ 451 bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC); 452 if (bat_priv->tt.last_changeset) { 453 memcpy(bat_priv->tt.last_changeset, tt_buff, new_len); 454 bat_priv->tt.last_changeset_len = new_len; 455 } 456 } 457 spin_unlock_bh(&bat_priv->tt.last_changeset_lock); 458 459 return count; 460 } 461 462 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) 463 { 464 struct net_device *net_dev = (struct net_device *)seq->private; 465 struct batadv_priv *bat_priv = netdev_priv(net_dev); 466 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 467 struct batadv_tt_common_entry *tt_common_entry; 468 struct batadv_tt_local_entry *tt_local; 469 struct batadv_hard_iface *primary_if; 470 struct hlist_head *head; 471 uint32_t i; 472 int last_seen_secs; 473 int last_seen_msecs; 474 unsigned long last_seen_jiffies; 475 bool no_purge; 476 uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE; 477 478 primary_if = batadv_seq_print_text_primary_if_get(seq); 479 if (!primary_if) 480 goto out; 481 482 seq_printf(seq, 483 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u CRC: %#.4x):\n", 484 net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn), 485 bat_priv->tt.local_crc); 486 seq_printf(seq, " %-13s %-7s %-10s\n", "Client", "Flags", 487 "Last seen"); 488 489 for (i = 0; i < hash->size; i++) { 490 head = &hash->table[i]; 491 492 rcu_read_lock(); 493 hlist_for_each_entry_rcu(tt_common_entry, 494 head, hash_entry) { 495 tt_local = container_of(tt_common_entry, 496 struct batadv_tt_local_entry, 497 common); 498 last_seen_jiffies = jiffies - tt_local->last_seen; 499 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); 500 last_seen_secs = last_seen_msecs / 1000; 501 last_seen_msecs = last_seen_msecs % 1000; 502 503 no_purge = tt_common_entry->flags & np_flag; 504 505 seq_printf(seq, " * %pM [%c%c%c%c%c] %3u.%03u\n", 506 tt_common_entry->addr, 507 (tt_common_entry->flags & 508 BATADV_TT_CLIENT_ROAM ? 'R' : '.'), 509 no_purge ? 'P' : '.', 510 (tt_common_entry->flags & 511 BATADV_TT_CLIENT_NEW ? 'N' : '.'), 512 (tt_common_entry->flags & 513 BATADV_TT_CLIENT_PENDING ? 'X' : '.'), 514 (tt_common_entry->flags & 515 BATADV_TT_CLIENT_WIFI ? 'W' : '.'), 516 no_purge ? 0 : last_seen_secs, 517 no_purge ? 0 : last_seen_msecs); 518 } 519 rcu_read_unlock(); 520 } 521 out: 522 if (primary_if) 523 batadv_hardif_free_ref(primary_if); 524 return 0; 525 } 526 527 static void 528 batadv_tt_local_set_pending(struct batadv_priv *bat_priv, 529 struct batadv_tt_local_entry *tt_local_entry, 530 uint16_t flags, const char *message) 531 { 532 batadv_tt_local_event(bat_priv, tt_local_entry->common.addr, 533 tt_local_entry->common.flags | flags); 534 535 /* The local client has to be marked as "pending to be removed" but has 536 * to be kept in the table in order to send it in a full table 537 * response issued before the net ttvn increment (consistency check) 538 */ 539 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; 540 541 batadv_dbg(BATADV_DBG_TT, bat_priv, 542 "Local tt entry (%pM) pending to be removed: %s\n", 543 tt_local_entry->common.addr, message); 544 } 545 546 /** 547 * batadv_tt_local_remove - logically remove an entry from the local table 548 * @bat_priv: the bat priv with all the soft interface information 549 * @addr: the MAC address of the client to remove 550 * @message: message to append to the log on deletion 551 * @roaming: true if the deletion is due to a roaming event 552 * 553 * Returns the flags assigned to the local entry before being deleted 554 */ 555 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv, 556 const uint8_t *addr, const char *message, 557 bool roaming) 558 { 559 struct batadv_tt_local_entry *tt_local_entry; 560 uint16_t flags, curr_flags = BATADV_NO_FLAGS; 561 562 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); 563 if (!tt_local_entry) 564 goto out; 565 566 curr_flags = tt_local_entry->common.flags; 567 568 flags = BATADV_TT_CLIENT_DEL; 569 /* if this global entry addition is due to a roaming, the node has to 570 * mark the local entry as "roamed" in order to correctly reroute 571 * packets later 572 */ 573 if (roaming) { 574 flags |= BATADV_TT_CLIENT_ROAM; 575 /* mark the local client as ROAMed */ 576 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM; 577 } 578 579 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) { 580 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, 581 message); 582 goto out; 583 } 584 /* if this client has been added right now, it is possible to 585 * immediately purge it 586 */ 587 batadv_tt_local_event(bat_priv, tt_local_entry->common.addr, 588 curr_flags | BATADV_TT_CLIENT_DEL); 589 hlist_del_rcu(&tt_local_entry->common.hash_entry); 590 batadv_tt_local_entry_free_ref(tt_local_entry); 591 592 out: 593 if (tt_local_entry) 594 batadv_tt_local_entry_free_ref(tt_local_entry); 595 596 return curr_flags; 597 } 598 599 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, 600 struct hlist_head *head) 601 { 602 struct batadv_tt_local_entry *tt_local_entry; 603 struct batadv_tt_common_entry *tt_common_entry; 604 struct hlist_node *node_tmp; 605 606 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head, 607 hash_entry) { 608 tt_local_entry = container_of(tt_common_entry, 609 struct batadv_tt_local_entry, 610 common); 611 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) 612 continue; 613 614 /* entry already marked for deletion */ 615 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) 616 continue; 617 618 if (!batadv_has_timed_out(tt_local_entry->last_seen, 619 BATADV_TT_LOCAL_TIMEOUT)) 620 continue; 621 622 batadv_tt_local_set_pending(bat_priv, tt_local_entry, 623 BATADV_TT_CLIENT_DEL, "timed out"); 624 } 625 } 626 627 static void batadv_tt_local_purge(struct batadv_priv *bat_priv) 628 { 629 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 630 struct hlist_head *head; 631 spinlock_t *list_lock; /* protects write access to the hash lists */ 632 uint32_t i; 633 634 for (i = 0; i < hash->size; i++) { 635 head = &hash->table[i]; 636 list_lock = &hash->list_locks[i]; 637 638 spin_lock_bh(list_lock); 639 batadv_tt_local_purge_list(bat_priv, head); 640 spin_unlock_bh(list_lock); 641 } 642 } 643 644 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) 645 { 646 struct batadv_hashtable *hash; 647 spinlock_t *list_lock; /* protects write access to the hash lists */ 648 struct batadv_tt_common_entry *tt_common_entry; 649 struct batadv_tt_local_entry *tt_local; 650 struct hlist_node *node_tmp; 651 struct hlist_head *head; 652 uint32_t i; 653 654 if (!bat_priv->tt.local_hash) 655 return; 656 657 hash = bat_priv->tt.local_hash; 658 659 for (i = 0; i < hash->size; i++) { 660 head = &hash->table[i]; 661 list_lock = &hash->list_locks[i]; 662 663 spin_lock_bh(list_lock); 664 hlist_for_each_entry_safe(tt_common_entry, node_tmp, 665 head, hash_entry) { 666 hlist_del_rcu(&tt_common_entry->hash_entry); 667 tt_local = container_of(tt_common_entry, 668 struct batadv_tt_local_entry, 669 common); 670 batadv_tt_local_entry_free_ref(tt_local); 671 } 672 spin_unlock_bh(list_lock); 673 } 674 675 batadv_hash_destroy(hash); 676 677 bat_priv->tt.local_hash = NULL; 678 } 679 680 static int batadv_tt_global_init(struct batadv_priv *bat_priv) 681 { 682 if (bat_priv->tt.global_hash) 683 return 0; 684 685 bat_priv->tt.global_hash = batadv_hash_new(1024); 686 687 if (!bat_priv->tt.global_hash) 688 return -ENOMEM; 689 690 batadv_hash_set_lock_class(bat_priv->tt.global_hash, 691 &batadv_tt_global_hash_lock_class_key); 692 693 return 0; 694 } 695 696 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) 697 { 698 struct batadv_tt_change_node *entry, *safe; 699 700 spin_lock_bh(&bat_priv->tt.changes_list_lock); 701 702 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, 703 list) { 704 list_del(&entry->list); 705 kfree(entry); 706 } 707 708 atomic_set(&bat_priv->tt.local_changes, 0); 709 spin_unlock_bh(&bat_priv->tt.changes_list_lock); 710 } 711 712 /* retrieves the orig_tt_list_entry belonging to orig_node from the 713 * batadv_tt_global_entry list 714 * 715 * returns it with an increased refcounter, NULL if not found 716 */ 717 static struct batadv_tt_orig_list_entry * 718 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, 719 const struct batadv_orig_node *orig_node) 720 { 721 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL; 722 const struct hlist_head *head; 723 724 rcu_read_lock(); 725 head = &entry->orig_list; 726 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) { 727 if (tmp_orig_entry->orig_node != orig_node) 728 continue; 729 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount)) 730 continue; 731 732 orig_entry = tmp_orig_entry; 733 break; 734 } 735 rcu_read_unlock(); 736 737 return orig_entry; 738 } 739 740 /* find out if an orig_node is already in the list of a tt_global_entry. 741 * returns true if found, false otherwise 742 */ 743 static bool 744 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, 745 const struct batadv_orig_node *orig_node) 746 { 747 struct batadv_tt_orig_list_entry *orig_entry; 748 bool found = false; 749 750 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node); 751 if (orig_entry) { 752 found = true; 753 batadv_tt_orig_list_entry_free_ref(orig_entry); 754 } 755 756 return found; 757 } 758 759 static void 760 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, 761 struct batadv_orig_node *orig_node, int ttvn) 762 { 763 struct batadv_tt_orig_list_entry *orig_entry; 764 765 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node); 766 if (orig_entry) { 767 /* refresh the ttvn: the current value could be a bogus one that 768 * was added during a "temporary client detection" 769 */ 770 orig_entry->ttvn = ttvn; 771 goto out; 772 } 773 774 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); 775 if (!orig_entry) 776 goto out; 777 778 INIT_HLIST_NODE(&orig_entry->list); 779 atomic_inc(&orig_node->refcount); 780 atomic_inc(&orig_node->tt_size); 781 orig_entry->orig_node = orig_node; 782 orig_entry->ttvn = ttvn; 783 atomic_set(&orig_entry->refcount, 2); 784 785 spin_lock_bh(&tt_global->list_lock); 786 hlist_add_head_rcu(&orig_entry->list, 787 &tt_global->orig_list); 788 spin_unlock_bh(&tt_global->list_lock); 789 out: 790 if (orig_entry) 791 batadv_tt_orig_list_entry_free_ref(orig_entry); 792 } 793 794 /* caller must hold orig_node refcount */ 795 int batadv_tt_global_add(struct batadv_priv *bat_priv, 796 struct batadv_orig_node *orig_node, 797 const unsigned char *tt_addr, uint8_t flags, 798 uint8_t ttvn) 799 { 800 struct batadv_tt_global_entry *tt_global_entry; 801 struct batadv_tt_local_entry *tt_local_entry; 802 int ret = 0; 803 int hash_added; 804 struct batadv_tt_common_entry *common; 805 uint16_t local_flags; 806 807 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); 808 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr); 809 810 /* if the node already has a local client for this entry, it has to wait 811 * for a roaming advertisement instead of manually messing up the global 812 * table 813 */ 814 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry && 815 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) 816 goto out; 817 818 if (!tt_global_entry) { 819 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC); 820 if (!tt_global_entry) 821 goto out; 822 823 common = &tt_global_entry->common; 824 memcpy(common->addr, tt_addr, ETH_ALEN); 825 826 common->flags = flags; 827 tt_global_entry->roam_at = 0; 828 /* node must store current time in case of roaming. This is 829 * needed to purge this entry out on timeout (if nobody claims 830 * it) 831 */ 832 if (flags & BATADV_TT_CLIENT_ROAM) 833 tt_global_entry->roam_at = jiffies; 834 atomic_set(&common->refcount, 2); 835 common->added_at = jiffies; 836 837 INIT_HLIST_HEAD(&tt_global_entry->orig_list); 838 spin_lock_init(&tt_global_entry->list_lock); 839 840 hash_added = batadv_hash_add(bat_priv->tt.global_hash, 841 batadv_compare_tt, 842 batadv_choose_orig, common, 843 &common->hash_entry); 844 845 if (unlikely(hash_added != 0)) { 846 /* remove the reference for the hash */ 847 batadv_tt_global_entry_free_ref(tt_global_entry); 848 goto out_remove; 849 } 850 } else { 851 common = &tt_global_entry->common; 852 /* If there is already a global entry, we can use this one for 853 * our processing. 854 * But if we are trying to add a temporary client then here are 855 * two options at this point: 856 * 1) the global client is not a temporary client: the global 857 * client has to be left as it is, temporary information 858 * should never override any already known client state 859 * 2) the global client is a temporary client: purge the 860 * originator list and add the new one orig_entry 861 */ 862 if (flags & BATADV_TT_CLIENT_TEMP) { 863 if (!(common->flags & BATADV_TT_CLIENT_TEMP)) 864 goto out; 865 if (batadv_tt_global_entry_has_orig(tt_global_entry, 866 orig_node)) 867 goto out_remove; 868 batadv_tt_global_del_orig_list(tt_global_entry); 869 goto add_orig_entry; 870 } 871 872 /* if the client was temporary added before receiving the first 873 * OGM announcing it, we have to clear the TEMP flag 874 */ 875 common->flags &= ~BATADV_TT_CLIENT_TEMP; 876 877 /* the change can carry possible "attribute" flags like the 878 * TT_CLIENT_WIFI, therefore they have to be copied in the 879 * client entry 880 */ 881 tt_global_entry->common.flags |= flags; 882 883 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only 884 * one originator left in the list and we previously received a 885 * delete + roaming change for this originator. 886 * 887 * We should first delete the old originator before adding the 888 * new one. 889 */ 890 if (common->flags & BATADV_TT_CLIENT_ROAM) { 891 batadv_tt_global_del_orig_list(tt_global_entry); 892 common->flags &= ~BATADV_TT_CLIENT_ROAM; 893 tt_global_entry->roam_at = 0; 894 } 895 } 896 add_orig_entry: 897 /* add the new orig_entry (if needed) or update it */ 898 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn); 899 900 batadv_dbg(BATADV_DBG_TT, bat_priv, 901 "Creating new global tt entry: %pM (via %pM)\n", 902 common->addr, orig_node->orig); 903 ret = 1; 904 905 out_remove: 906 907 /* remove address from local hash if present */ 908 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, 909 "global tt received", 910 flags & BATADV_TT_CLIENT_ROAM); 911 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI; 912 913 if (!(flags & BATADV_TT_CLIENT_ROAM)) 914 /* this is a normal global add. Therefore the client is not in a 915 * roaming state anymore. 916 */ 917 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; 918 919 out: 920 if (tt_global_entry) 921 batadv_tt_global_entry_free_ref(tt_global_entry); 922 if (tt_local_entry) 923 batadv_tt_local_entry_free_ref(tt_local_entry); 924 return ret; 925 } 926 927 /* batadv_transtable_best_orig - Get best originator list entry from tt entry 928 * @tt_global_entry: global translation table entry to be analyzed 929 * 930 * This functon assumes the caller holds rcu_read_lock(). 931 * Returns best originator list entry or NULL on errors. 932 */ 933 static struct batadv_tt_orig_list_entry * 934 batadv_transtable_best_orig(struct batadv_tt_global_entry *tt_global_entry) 935 { 936 struct batadv_neigh_node *router = NULL; 937 struct hlist_head *head; 938 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL; 939 int best_tq = 0; 940 941 head = &tt_global_entry->orig_list; 942 hlist_for_each_entry_rcu(orig_entry, head, list) { 943 router = batadv_orig_node_get_router(orig_entry->orig_node); 944 if (!router) 945 continue; 946 947 if (router->tq_avg > best_tq) { 948 best_entry = orig_entry; 949 best_tq = router->tq_avg; 950 } 951 952 batadv_neigh_node_free_ref(router); 953 } 954 955 return best_entry; 956 } 957 958 /* batadv_tt_global_print_entry - print all orig nodes who announce the address 959 * for this global entry 960 * @tt_global_entry: global translation table entry to be printed 961 * @seq: debugfs table seq_file struct 962 * 963 * This functon assumes the caller holds rcu_read_lock(). 964 */ 965 static void 966 batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry, 967 struct seq_file *seq) 968 { 969 struct hlist_head *head; 970 struct batadv_tt_orig_list_entry *orig_entry, *best_entry; 971 struct batadv_tt_common_entry *tt_common_entry; 972 uint16_t flags; 973 uint8_t last_ttvn; 974 975 tt_common_entry = &tt_global_entry->common; 976 flags = tt_common_entry->flags; 977 978 best_entry = batadv_transtable_best_orig(tt_global_entry); 979 if (best_entry) { 980 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn); 981 seq_printf(seq, 982 " %c %pM (%3u) via %pM (%3u) (%#.4x) [%c%c%c]\n", 983 '*', tt_global_entry->common.addr, 984 best_entry->ttvn, best_entry->orig_node->orig, 985 last_ttvn, best_entry->orig_node->tt_crc, 986 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), 987 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), 988 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); 989 } 990 991 head = &tt_global_entry->orig_list; 992 993 hlist_for_each_entry_rcu(orig_entry, head, list) { 994 if (best_entry == orig_entry) 995 continue; 996 997 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); 998 seq_printf(seq, " %c %pM (%3u) via %pM (%3u) [%c%c%c]\n", 999 '+', tt_global_entry->common.addr, 1000 orig_entry->ttvn, orig_entry->orig_node->orig, 1001 last_ttvn, 1002 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), 1003 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), 1004 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); 1005 } 1006 } 1007 1008 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) 1009 { 1010 struct net_device *net_dev = (struct net_device *)seq->private; 1011 struct batadv_priv *bat_priv = netdev_priv(net_dev); 1012 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 1013 struct batadv_tt_common_entry *tt_common_entry; 1014 struct batadv_tt_global_entry *tt_global; 1015 struct batadv_hard_iface *primary_if; 1016 struct hlist_head *head; 1017 uint32_t i; 1018 1019 primary_if = batadv_seq_print_text_primary_if_get(seq); 1020 if (!primary_if) 1021 goto out; 1022 1023 seq_printf(seq, 1024 "Globally announced TT entries received via the mesh %s\n", 1025 net_dev->name); 1026 seq_printf(seq, " %-13s %s %-15s %s (%-6s) %s\n", 1027 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "CRC", 1028 "Flags"); 1029 1030 for (i = 0; i < hash->size; i++) { 1031 head = &hash->table[i]; 1032 1033 rcu_read_lock(); 1034 hlist_for_each_entry_rcu(tt_common_entry, 1035 head, hash_entry) { 1036 tt_global = container_of(tt_common_entry, 1037 struct batadv_tt_global_entry, 1038 common); 1039 batadv_tt_global_print_entry(tt_global, seq); 1040 } 1041 rcu_read_unlock(); 1042 } 1043 out: 1044 if (primary_if) 1045 batadv_hardif_free_ref(primary_if); 1046 return 0; 1047 } 1048 1049 /* deletes the orig list of a tt_global_entry */ 1050 static void 1051 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) 1052 { 1053 struct hlist_head *head; 1054 struct hlist_node *safe; 1055 struct batadv_tt_orig_list_entry *orig_entry; 1056 1057 spin_lock_bh(&tt_global_entry->list_lock); 1058 head = &tt_global_entry->orig_list; 1059 hlist_for_each_entry_safe(orig_entry, safe, head, list) { 1060 hlist_del_rcu(&orig_entry->list); 1061 batadv_tt_orig_list_entry_free_ref(orig_entry); 1062 } 1063 spin_unlock_bh(&tt_global_entry->list_lock); 1064 } 1065 1066 static void 1067 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, 1068 struct batadv_tt_global_entry *tt_global_entry, 1069 struct batadv_orig_node *orig_node, 1070 const char *message) 1071 { 1072 struct hlist_head *head; 1073 struct hlist_node *safe; 1074 struct batadv_tt_orig_list_entry *orig_entry; 1075 1076 spin_lock_bh(&tt_global_entry->list_lock); 1077 head = &tt_global_entry->orig_list; 1078 hlist_for_each_entry_safe(orig_entry, safe, head, list) { 1079 if (orig_entry->orig_node == orig_node) { 1080 batadv_dbg(BATADV_DBG_TT, bat_priv, 1081 "Deleting %pM from global tt entry %pM: %s\n", 1082 orig_node->orig, 1083 tt_global_entry->common.addr, message); 1084 hlist_del_rcu(&orig_entry->list); 1085 batadv_tt_orig_list_entry_free_ref(orig_entry); 1086 } 1087 } 1088 spin_unlock_bh(&tt_global_entry->list_lock); 1089 } 1090 1091 /* If the client is to be deleted, we check if it is the last origantor entry 1092 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the 1093 * timer, otherwise we simply remove the originator scheduled for deletion. 1094 */ 1095 static void 1096 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, 1097 struct batadv_tt_global_entry *tt_global_entry, 1098 struct batadv_orig_node *orig_node, 1099 const char *message) 1100 { 1101 bool last_entry = true; 1102 struct hlist_head *head; 1103 struct batadv_tt_orig_list_entry *orig_entry; 1104 1105 /* no local entry exists, case 1: 1106 * Check if this is the last one or if other entries exist. 1107 */ 1108 1109 rcu_read_lock(); 1110 head = &tt_global_entry->orig_list; 1111 hlist_for_each_entry_rcu(orig_entry, head, list) { 1112 if (orig_entry->orig_node != orig_node) { 1113 last_entry = false; 1114 break; 1115 } 1116 } 1117 rcu_read_unlock(); 1118 1119 if (last_entry) { 1120 /* its the last one, mark for roaming. */ 1121 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; 1122 tt_global_entry->roam_at = jiffies; 1123 } else 1124 /* there is another entry, we can simply delete this 1125 * one and can still use the other one. 1126 */ 1127 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, 1128 orig_node, message); 1129 } 1130 1131 1132 1133 static void batadv_tt_global_del(struct batadv_priv *bat_priv, 1134 struct batadv_orig_node *orig_node, 1135 const unsigned char *addr, 1136 const char *message, bool roaming) 1137 { 1138 struct batadv_tt_global_entry *tt_global_entry; 1139 struct batadv_tt_local_entry *local_entry = NULL; 1140 1141 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); 1142 if (!tt_global_entry) 1143 goto out; 1144 1145 if (!roaming) { 1146 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, 1147 orig_node, message); 1148 1149 if (hlist_empty(&tt_global_entry->orig_list)) 1150 batadv_tt_global_free(bat_priv, tt_global_entry, 1151 message); 1152 1153 goto out; 1154 } 1155 1156 /* if we are deleting a global entry due to a roam 1157 * event, there are two possibilities: 1158 * 1) the client roamed from node A to node B => if there 1159 * is only one originator left for this client, we mark 1160 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we 1161 * wait for node B to claim it. In case of timeout 1162 * the entry is purged. 1163 * 1164 * If there are other originators left, we directly delete 1165 * the originator. 1166 * 2) the client roamed to us => we can directly delete 1167 * the global entry, since it is useless now. 1168 */ 1169 local_entry = batadv_tt_local_hash_find(bat_priv, 1170 tt_global_entry->common.addr); 1171 if (local_entry) { 1172 /* local entry exists, case 2: client roamed to us. */ 1173 batadv_tt_global_del_orig_list(tt_global_entry); 1174 batadv_tt_global_free(bat_priv, tt_global_entry, message); 1175 } else 1176 /* no local entry exists, case 1: check for roaming */ 1177 batadv_tt_global_del_roaming(bat_priv, tt_global_entry, 1178 orig_node, message); 1179 1180 1181 out: 1182 if (tt_global_entry) 1183 batadv_tt_global_entry_free_ref(tt_global_entry); 1184 if (local_entry) 1185 batadv_tt_local_entry_free_ref(local_entry); 1186 } 1187 1188 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, 1189 struct batadv_orig_node *orig_node, 1190 const char *message) 1191 { 1192 struct batadv_tt_global_entry *tt_global; 1193 struct batadv_tt_common_entry *tt_common_entry; 1194 uint32_t i; 1195 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 1196 struct hlist_node *safe; 1197 struct hlist_head *head; 1198 spinlock_t *list_lock; /* protects write access to the hash lists */ 1199 1200 if (!hash) 1201 return; 1202 1203 for (i = 0; i < hash->size; i++) { 1204 head = &hash->table[i]; 1205 list_lock = &hash->list_locks[i]; 1206 1207 spin_lock_bh(list_lock); 1208 hlist_for_each_entry_safe(tt_common_entry, safe, 1209 head, hash_entry) { 1210 tt_global = container_of(tt_common_entry, 1211 struct batadv_tt_global_entry, 1212 common); 1213 1214 batadv_tt_global_del_orig_entry(bat_priv, tt_global, 1215 orig_node, message); 1216 1217 if (hlist_empty(&tt_global->orig_list)) { 1218 batadv_dbg(BATADV_DBG_TT, bat_priv, 1219 "Deleting global tt entry %pM: %s\n", 1220 tt_global->common.addr, message); 1221 hlist_del_rcu(&tt_common_entry->hash_entry); 1222 batadv_tt_global_entry_free_ref(tt_global); 1223 } 1224 } 1225 spin_unlock_bh(list_lock); 1226 } 1227 orig_node->tt_initialised = false; 1228 } 1229 1230 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global, 1231 char **msg) 1232 { 1233 bool purge = false; 1234 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT; 1235 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT; 1236 1237 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) && 1238 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) { 1239 purge = true; 1240 *msg = "Roaming timeout\n"; 1241 } 1242 1243 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) && 1244 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) { 1245 purge = true; 1246 *msg = "Temporary client timeout\n"; 1247 } 1248 1249 return purge; 1250 } 1251 1252 static void batadv_tt_global_purge(struct batadv_priv *bat_priv) 1253 { 1254 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 1255 struct hlist_head *head; 1256 struct hlist_node *node_tmp; 1257 spinlock_t *list_lock; /* protects write access to the hash lists */ 1258 uint32_t i; 1259 char *msg = NULL; 1260 struct batadv_tt_common_entry *tt_common; 1261 struct batadv_tt_global_entry *tt_global; 1262 1263 for (i = 0; i < hash->size; i++) { 1264 head = &hash->table[i]; 1265 list_lock = &hash->list_locks[i]; 1266 1267 spin_lock_bh(list_lock); 1268 hlist_for_each_entry_safe(tt_common, node_tmp, head, 1269 hash_entry) { 1270 tt_global = container_of(tt_common, 1271 struct batadv_tt_global_entry, 1272 common); 1273 1274 if (!batadv_tt_global_to_purge(tt_global, &msg)) 1275 continue; 1276 1277 batadv_dbg(BATADV_DBG_TT, bat_priv, 1278 "Deleting global tt entry (%pM): %s\n", 1279 tt_global->common.addr, msg); 1280 1281 hlist_del_rcu(&tt_common->hash_entry); 1282 1283 batadv_tt_global_entry_free_ref(tt_global); 1284 } 1285 spin_unlock_bh(list_lock); 1286 } 1287 } 1288 1289 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) 1290 { 1291 struct batadv_hashtable *hash; 1292 spinlock_t *list_lock; /* protects write access to the hash lists */ 1293 struct batadv_tt_common_entry *tt_common_entry; 1294 struct batadv_tt_global_entry *tt_global; 1295 struct hlist_node *node_tmp; 1296 struct hlist_head *head; 1297 uint32_t i; 1298 1299 if (!bat_priv->tt.global_hash) 1300 return; 1301 1302 hash = bat_priv->tt.global_hash; 1303 1304 for (i = 0; i < hash->size; i++) { 1305 head = &hash->table[i]; 1306 list_lock = &hash->list_locks[i]; 1307 1308 spin_lock_bh(list_lock); 1309 hlist_for_each_entry_safe(tt_common_entry, node_tmp, 1310 head, hash_entry) { 1311 hlist_del_rcu(&tt_common_entry->hash_entry); 1312 tt_global = container_of(tt_common_entry, 1313 struct batadv_tt_global_entry, 1314 common); 1315 batadv_tt_global_entry_free_ref(tt_global); 1316 } 1317 spin_unlock_bh(list_lock); 1318 } 1319 1320 batadv_hash_destroy(hash); 1321 1322 bat_priv->tt.global_hash = NULL; 1323 } 1324 1325 static bool 1326 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, 1327 struct batadv_tt_global_entry *tt_global_entry) 1328 { 1329 bool ret = false; 1330 1331 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && 1332 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) 1333 ret = true; 1334 1335 return ret; 1336 } 1337 1338 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, 1339 const uint8_t *src, 1340 const uint8_t *addr) 1341 { 1342 struct batadv_tt_local_entry *tt_local_entry = NULL; 1343 struct batadv_tt_global_entry *tt_global_entry = NULL; 1344 struct batadv_orig_node *orig_node = NULL; 1345 struct batadv_tt_orig_list_entry *best_entry; 1346 1347 if (src && atomic_read(&bat_priv->ap_isolation)) { 1348 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); 1349 if (!tt_local_entry || 1350 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)) 1351 goto out; 1352 } 1353 1354 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); 1355 if (!tt_global_entry) 1356 goto out; 1357 1358 /* check whether the clients should not communicate due to AP 1359 * isolation 1360 */ 1361 if (tt_local_entry && 1362 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) 1363 goto out; 1364 1365 rcu_read_lock(); 1366 best_entry = batadv_transtable_best_orig(tt_global_entry); 1367 /* found anything? */ 1368 if (best_entry) 1369 orig_node = best_entry->orig_node; 1370 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) 1371 orig_node = NULL; 1372 rcu_read_unlock(); 1373 1374 out: 1375 if (tt_global_entry) 1376 batadv_tt_global_entry_free_ref(tt_global_entry); 1377 if (tt_local_entry) 1378 batadv_tt_local_entry_free_ref(tt_local_entry); 1379 1380 return orig_node; 1381 } 1382 1383 /* Calculates the checksum of the local table of a given orig_node */ 1384 static uint16_t batadv_tt_global_crc(struct batadv_priv *bat_priv, 1385 struct batadv_orig_node *orig_node) 1386 { 1387 uint16_t total = 0, total_one; 1388 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 1389 struct batadv_tt_common_entry *tt_common; 1390 struct batadv_tt_global_entry *tt_global; 1391 struct hlist_head *head; 1392 uint32_t i; 1393 int j; 1394 1395 for (i = 0; i < hash->size; i++) { 1396 head = &hash->table[i]; 1397 1398 rcu_read_lock(); 1399 hlist_for_each_entry_rcu(tt_common, head, hash_entry) { 1400 tt_global = container_of(tt_common, 1401 struct batadv_tt_global_entry, 1402 common); 1403 /* Roaming clients are in the global table for 1404 * consistency only. They don't have to be 1405 * taken into account while computing the 1406 * global crc 1407 */ 1408 if (tt_common->flags & BATADV_TT_CLIENT_ROAM) 1409 continue; 1410 /* Temporary clients have not been announced yet, so 1411 * they have to be skipped while computing the global 1412 * crc 1413 */ 1414 if (tt_common->flags & BATADV_TT_CLIENT_TEMP) 1415 continue; 1416 1417 /* find out if this global entry is announced by this 1418 * originator 1419 */ 1420 if (!batadv_tt_global_entry_has_orig(tt_global, 1421 orig_node)) 1422 continue; 1423 1424 total_one = 0; 1425 for (j = 0; j < ETH_ALEN; j++) 1426 total_one = crc16_byte(total_one, 1427 tt_common->addr[j]); 1428 total ^= total_one; 1429 } 1430 rcu_read_unlock(); 1431 } 1432 1433 return total; 1434 } 1435 1436 /* Calculates the checksum of the local table */ 1437 static uint16_t batadv_tt_local_crc(struct batadv_priv *bat_priv) 1438 { 1439 uint16_t total = 0, total_one; 1440 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 1441 struct batadv_tt_common_entry *tt_common; 1442 struct hlist_head *head; 1443 uint32_t i; 1444 int j; 1445 1446 for (i = 0; i < hash->size; i++) { 1447 head = &hash->table[i]; 1448 1449 rcu_read_lock(); 1450 hlist_for_each_entry_rcu(tt_common, head, hash_entry) { 1451 /* not yet committed clients have not to be taken into 1452 * account while computing the CRC 1453 */ 1454 if (tt_common->flags & BATADV_TT_CLIENT_NEW) 1455 continue; 1456 total_one = 0; 1457 for (j = 0; j < ETH_ALEN; j++) 1458 total_one = crc16_byte(total_one, 1459 tt_common->addr[j]); 1460 total ^= total_one; 1461 } 1462 rcu_read_unlock(); 1463 } 1464 1465 return total; 1466 } 1467 1468 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) 1469 { 1470 struct batadv_tt_req_node *node, *safe; 1471 1472 spin_lock_bh(&bat_priv->tt.req_list_lock); 1473 1474 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { 1475 list_del(&node->list); 1476 kfree(node); 1477 } 1478 1479 spin_unlock_bh(&bat_priv->tt.req_list_lock); 1480 } 1481 1482 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, 1483 struct batadv_orig_node *orig_node, 1484 const unsigned char *tt_buff, 1485 uint8_t tt_num_changes) 1486 { 1487 uint16_t tt_buff_len = batadv_tt_len(tt_num_changes); 1488 1489 /* Replace the old buffer only if I received something in the 1490 * last OGM (the OGM could carry no changes) 1491 */ 1492 spin_lock_bh(&orig_node->tt_buff_lock); 1493 if (tt_buff_len > 0) { 1494 kfree(orig_node->tt_buff); 1495 orig_node->tt_buff_len = 0; 1496 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); 1497 if (orig_node->tt_buff) { 1498 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); 1499 orig_node->tt_buff_len = tt_buff_len; 1500 } 1501 } 1502 spin_unlock_bh(&orig_node->tt_buff_lock); 1503 } 1504 1505 static void batadv_tt_req_purge(struct batadv_priv *bat_priv) 1506 { 1507 struct batadv_tt_req_node *node, *safe; 1508 1509 spin_lock_bh(&bat_priv->tt.req_list_lock); 1510 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { 1511 if (batadv_has_timed_out(node->issued_at, 1512 BATADV_TT_REQUEST_TIMEOUT)) { 1513 list_del(&node->list); 1514 kfree(node); 1515 } 1516 } 1517 spin_unlock_bh(&bat_priv->tt.req_list_lock); 1518 } 1519 1520 /* returns the pointer to the new tt_req_node struct if no request 1521 * has already been issued for this orig_node, NULL otherwise 1522 */ 1523 static struct batadv_tt_req_node * 1524 batadv_new_tt_req_node(struct batadv_priv *bat_priv, 1525 struct batadv_orig_node *orig_node) 1526 { 1527 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; 1528 1529 spin_lock_bh(&bat_priv->tt.req_list_lock); 1530 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { 1531 if (batadv_compare_eth(tt_req_node_tmp, orig_node) && 1532 !batadv_has_timed_out(tt_req_node_tmp->issued_at, 1533 BATADV_TT_REQUEST_TIMEOUT)) 1534 goto unlock; 1535 } 1536 1537 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); 1538 if (!tt_req_node) 1539 goto unlock; 1540 1541 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); 1542 tt_req_node->issued_at = jiffies; 1543 1544 list_add(&tt_req_node->list, &bat_priv->tt.req_list); 1545 unlock: 1546 spin_unlock_bh(&bat_priv->tt.req_list_lock); 1547 return tt_req_node; 1548 } 1549 1550 /* data_ptr is useless here, but has to be kept to respect the prototype */ 1551 static int batadv_tt_local_valid_entry(const void *entry_ptr, 1552 const void *data_ptr) 1553 { 1554 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; 1555 1556 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) 1557 return 0; 1558 return 1; 1559 } 1560 1561 static int batadv_tt_global_valid(const void *entry_ptr, 1562 const void *data_ptr) 1563 { 1564 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; 1565 const struct batadv_tt_global_entry *tt_global_entry; 1566 const struct batadv_orig_node *orig_node = data_ptr; 1567 1568 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM || 1569 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP) 1570 return 0; 1571 1572 tt_global_entry = container_of(tt_common_entry, 1573 struct batadv_tt_global_entry, 1574 common); 1575 1576 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node); 1577 } 1578 1579 static struct sk_buff * 1580 batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, 1581 struct batadv_hashtable *hash, 1582 struct batadv_priv *bat_priv, 1583 int (*valid_cb)(const void *, const void *), 1584 void *cb_data) 1585 { 1586 struct batadv_tt_common_entry *tt_common_entry; 1587 struct batadv_tt_query_packet *tt_response; 1588 struct batadv_tt_change *tt_change; 1589 struct hlist_head *head; 1590 struct sk_buff *skb = NULL; 1591 uint16_t tt_tot, tt_count; 1592 ssize_t tt_query_size = sizeof(struct batadv_tt_query_packet); 1593 uint32_t i; 1594 size_t len; 1595 1596 if (tt_query_size + tt_len > bat_priv->soft_iface->mtu) { 1597 tt_len = bat_priv->soft_iface->mtu - tt_query_size; 1598 tt_len -= tt_len % sizeof(struct batadv_tt_change); 1599 } 1600 tt_tot = tt_len / sizeof(struct batadv_tt_change); 1601 1602 len = tt_query_size + tt_len; 1603 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN); 1604 if (!skb) 1605 goto out; 1606 1607 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); 1608 tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len); 1609 tt_response->ttvn = ttvn; 1610 1611 tt_change = (struct batadv_tt_change *)(skb->data + tt_query_size); 1612 tt_count = 0; 1613 1614 rcu_read_lock(); 1615 for (i = 0; i < hash->size; i++) { 1616 head = &hash->table[i]; 1617 1618 hlist_for_each_entry_rcu(tt_common_entry, 1619 head, hash_entry) { 1620 if (tt_count == tt_tot) 1621 break; 1622 1623 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) 1624 continue; 1625 1626 memcpy(tt_change->addr, tt_common_entry->addr, 1627 ETH_ALEN); 1628 tt_change->flags = tt_common_entry->flags; 1629 1630 tt_count++; 1631 tt_change++; 1632 } 1633 } 1634 rcu_read_unlock(); 1635 1636 /* store in the message the number of entries we have successfully 1637 * copied 1638 */ 1639 tt_response->tt_data = htons(tt_count); 1640 1641 out: 1642 return skb; 1643 } 1644 1645 static int batadv_send_tt_request(struct batadv_priv *bat_priv, 1646 struct batadv_orig_node *dst_orig_node, 1647 uint8_t ttvn, uint16_t tt_crc, 1648 bool full_table) 1649 { 1650 struct sk_buff *skb = NULL; 1651 struct batadv_tt_query_packet *tt_request; 1652 struct batadv_hard_iface *primary_if; 1653 struct batadv_tt_req_node *tt_req_node = NULL; 1654 int ret = 1; 1655 size_t tt_req_len; 1656 1657 primary_if = batadv_primary_if_get_selected(bat_priv); 1658 if (!primary_if) 1659 goto out; 1660 1661 /* The new tt_req will be issued only if I'm not waiting for a 1662 * reply from the same orig_node yet 1663 */ 1664 tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node); 1665 if (!tt_req_node) 1666 goto out; 1667 1668 skb = dev_alloc_skb(sizeof(*tt_request) + ETH_HLEN + NET_IP_ALIGN); 1669 if (!skb) 1670 goto out; 1671 1672 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); 1673 1674 tt_req_len = sizeof(*tt_request); 1675 tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len); 1676 1677 tt_request->header.packet_type = BATADV_TT_QUERY; 1678 tt_request->header.version = BATADV_COMPAT_VERSION; 1679 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); 1680 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); 1681 tt_request->header.ttl = BATADV_TTL; 1682 tt_request->ttvn = ttvn; 1683 tt_request->tt_data = htons(tt_crc); 1684 tt_request->flags = BATADV_TT_REQUEST; 1685 1686 if (full_table) 1687 tt_request->flags |= BATADV_TT_FULL_TABLE; 1688 1689 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n", 1690 dst_orig_node->orig, (full_table ? 'F' : '.')); 1691 1692 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); 1693 1694 if (batadv_send_skb_to_orig(skb, dst_orig_node, NULL)) 1695 ret = 0; 1696 1697 out: 1698 if (primary_if) 1699 batadv_hardif_free_ref(primary_if); 1700 if (ret) 1701 kfree_skb(skb); 1702 if (ret && tt_req_node) { 1703 spin_lock_bh(&bat_priv->tt.req_list_lock); 1704 list_del(&tt_req_node->list); 1705 spin_unlock_bh(&bat_priv->tt.req_list_lock); 1706 kfree(tt_req_node); 1707 } 1708 return ret; 1709 } 1710 1711 static bool 1712 batadv_send_other_tt_response(struct batadv_priv *bat_priv, 1713 struct batadv_tt_query_packet *tt_request) 1714 { 1715 struct batadv_orig_node *req_dst_orig_node; 1716 struct batadv_orig_node *res_dst_orig_node = NULL; 1717 uint8_t orig_ttvn, req_ttvn, ttvn; 1718 int ret = false; 1719 unsigned char *tt_buff; 1720 bool full_table; 1721 uint16_t tt_len, tt_tot; 1722 struct sk_buff *skb = NULL; 1723 struct batadv_tt_query_packet *tt_response; 1724 uint8_t *packet_pos; 1725 size_t len; 1726 1727 batadv_dbg(BATADV_DBG_TT, bat_priv, 1728 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", 1729 tt_request->src, tt_request->ttvn, tt_request->dst, 1730 (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); 1731 1732 /* Let's get the orig node of the REAL destination */ 1733 req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst); 1734 if (!req_dst_orig_node) 1735 goto out; 1736 1737 res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); 1738 if (!res_dst_orig_node) 1739 goto out; 1740 1741 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); 1742 req_ttvn = tt_request->ttvn; 1743 1744 /* I don't have the requested data */ 1745 if (orig_ttvn != req_ttvn || 1746 tt_request->tt_data != htons(req_dst_orig_node->tt_crc)) 1747 goto out; 1748 1749 /* If the full table has been explicitly requested */ 1750 if (tt_request->flags & BATADV_TT_FULL_TABLE || 1751 !req_dst_orig_node->tt_buff) 1752 full_table = true; 1753 else 1754 full_table = false; 1755 1756 /* In this version, fragmentation is not implemented, then 1757 * I'll send only one packet with as much TT entries as I can 1758 */ 1759 if (!full_table) { 1760 spin_lock_bh(&req_dst_orig_node->tt_buff_lock); 1761 tt_len = req_dst_orig_node->tt_buff_len; 1762 tt_tot = tt_len / sizeof(struct batadv_tt_change); 1763 1764 len = sizeof(*tt_response) + tt_len; 1765 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN); 1766 if (!skb) 1767 goto unlock; 1768 1769 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); 1770 packet_pos = skb_put(skb, len); 1771 tt_response = (struct batadv_tt_query_packet *)packet_pos; 1772 tt_response->ttvn = req_ttvn; 1773 tt_response->tt_data = htons(tt_tot); 1774 1775 tt_buff = skb->data + sizeof(*tt_response); 1776 /* Copy the last orig_node's OGM buffer */ 1777 memcpy(tt_buff, req_dst_orig_node->tt_buff, 1778 req_dst_orig_node->tt_buff_len); 1779 1780 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); 1781 } else { 1782 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size); 1783 tt_len *= sizeof(struct batadv_tt_change); 1784 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); 1785 1786 skb = batadv_tt_response_fill_table(tt_len, ttvn, 1787 bat_priv->tt.global_hash, 1788 bat_priv, 1789 batadv_tt_global_valid, 1790 req_dst_orig_node); 1791 if (!skb) 1792 goto out; 1793 1794 tt_response = (struct batadv_tt_query_packet *)skb->data; 1795 } 1796 1797 tt_response->header.packet_type = BATADV_TT_QUERY; 1798 tt_response->header.version = BATADV_COMPAT_VERSION; 1799 tt_response->header.ttl = BATADV_TTL; 1800 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); 1801 memcpy(tt_response->dst, tt_request->src, ETH_ALEN); 1802 tt_response->flags = BATADV_TT_RESPONSE; 1803 1804 if (full_table) 1805 tt_response->flags |= BATADV_TT_FULL_TABLE; 1806 1807 batadv_dbg(BATADV_DBG_TT, bat_priv, 1808 "Sending TT_RESPONSE %pM for %pM (ttvn: %u)\n", 1809 res_dst_orig_node->orig, req_dst_orig_node->orig, req_ttvn); 1810 1811 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); 1812 1813 if (batadv_send_skb_to_orig(skb, res_dst_orig_node, NULL)) 1814 ret = true; 1815 goto out; 1816 1817 unlock: 1818 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); 1819 1820 out: 1821 if (res_dst_orig_node) 1822 batadv_orig_node_free_ref(res_dst_orig_node); 1823 if (req_dst_orig_node) 1824 batadv_orig_node_free_ref(req_dst_orig_node); 1825 if (!ret) 1826 kfree_skb(skb); 1827 return ret; 1828 } 1829 1830 static bool 1831 batadv_send_my_tt_response(struct batadv_priv *bat_priv, 1832 struct batadv_tt_query_packet *tt_request) 1833 { 1834 struct batadv_orig_node *orig_node; 1835 struct batadv_hard_iface *primary_if = NULL; 1836 uint8_t my_ttvn, req_ttvn, ttvn; 1837 int ret = false; 1838 unsigned char *tt_buff; 1839 bool full_table; 1840 uint16_t tt_len, tt_tot; 1841 struct sk_buff *skb = NULL; 1842 struct batadv_tt_query_packet *tt_response; 1843 uint8_t *packet_pos; 1844 size_t len; 1845 1846 batadv_dbg(BATADV_DBG_TT, bat_priv, 1847 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", 1848 tt_request->src, tt_request->ttvn, 1849 (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); 1850 1851 1852 my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); 1853 req_ttvn = tt_request->ttvn; 1854 1855 orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); 1856 if (!orig_node) 1857 goto out; 1858 1859 primary_if = batadv_primary_if_get_selected(bat_priv); 1860 if (!primary_if) 1861 goto out; 1862 1863 /* If the full table has been explicitly requested or the gap 1864 * is too big send the whole local translation table 1865 */ 1866 if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || 1867 !bat_priv->tt.last_changeset) 1868 full_table = true; 1869 else 1870 full_table = false; 1871 1872 /* In this version, fragmentation is not implemented, then 1873 * I'll send only one packet with as much TT entries as I can 1874 */ 1875 if (!full_table) { 1876 spin_lock_bh(&bat_priv->tt.last_changeset_lock); 1877 tt_len = bat_priv->tt.last_changeset_len; 1878 tt_tot = tt_len / sizeof(struct batadv_tt_change); 1879 1880 len = sizeof(*tt_response) + tt_len; 1881 skb = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN); 1882 if (!skb) 1883 goto unlock; 1884 1885 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); 1886 packet_pos = skb_put(skb, len); 1887 tt_response = (struct batadv_tt_query_packet *)packet_pos; 1888 tt_response->ttvn = req_ttvn; 1889 tt_response->tt_data = htons(tt_tot); 1890 1891 tt_buff = skb->data + sizeof(*tt_response); 1892 memcpy(tt_buff, bat_priv->tt.last_changeset, 1893 bat_priv->tt.last_changeset_len); 1894 spin_unlock_bh(&bat_priv->tt.last_changeset_lock); 1895 } else { 1896 tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num); 1897 tt_len *= sizeof(struct batadv_tt_change); 1898 ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); 1899 1900 skb = batadv_tt_response_fill_table(tt_len, ttvn, 1901 bat_priv->tt.local_hash, 1902 bat_priv, 1903 batadv_tt_local_valid_entry, 1904 NULL); 1905 if (!skb) 1906 goto out; 1907 1908 tt_response = (struct batadv_tt_query_packet *)skb->data; 1909 } 1910 1911 tt_response->header.packet_type = BATADV_TT_QUERY; 1912 tt_response->header.version = BATADV_COMPAT_VERSION; 1913 tt_response->header.ttl = BATADV_TTL; 1914 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); 1915 memcpy(tt_response->dst, tt_request->src, ETH_ALEN); 1916 tt_response->flags = BATADV_TT_RESPONSE; 1917 1918 if (full_table) 1919 tt_response->flags |= BATADV_TT_FULL_TABLE; 1920 1921 batadv_dbg(BATADV_DBG_TT, bat_priv, 1922 "Sending TT_RESPONSE to %pM [%c]\n", 1923 orig_node->orig, 1924 (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); 1925 1926 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); 1927 1928 if (batadv_send_skb_to_orig(skb, orig_node, NULL)) 1929 ret = true; 1930 goto out; 1931 1932 unlock: 1933 spin_unlock_bh(&bat_priv->tt.last_changeset_lock); 1934 out: 1935 if (orig_node) 1936 batadv_orig_node_free_ref(orig_node); 1937 if (primary_if) 1938 batadv_hardif_free_ref(primary_if); 1939 if (!ret) 1940 kfree_skb(skb); 1941 /* This packet was for me, so it doesn't need to be re-routed */ 1942 return true; 1943 } 1944 1945 bool batadv_send_tt_response(struct batadv_priv *bat_priv, 1946 struct batadv_tt_query_packet *tt_request) 1947 { 1948 if (batadv_is_my_mac(bat_priv, tt_request->dst)) { 1949 /* don't answer backbone gws! */ 1950 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src)) 1951 return true; 1952 1953 return batadv_send_my_tt_response(bat_priv, tt_request); 1954 } else { 1955 return batadv_send_other_tt_response(bat_priv, tt_request); 1956 } 1957 } 1958 1959 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, 1960 struct batadv_orig_node *orig_node, 1961 struct batadv_tt_change *tt_change, 1962 uint16_t tt_num_changes, uint8_t ttvn) 1963 { 1964 int i; 1965 int roams; 1966 1967 for (i = 0; i < tt_num_changes; i++) { 1968 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { 1969 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; 1970 batadv_tt_global_del(bat_priv, orig_node, 1971 (tt_change + i)->addr, 1972 "tt removed by changes", 1973 roams); 1974 } else { 1975 if (!batadv_tt_global_add(bat_priv, orig_node, 1976 (tt_change + i)->addr, 1977 (tt_change + i)->flags, ttvn)) 1978 /* In case of problem while storing a 1979 * global_entry, we stop the updating 1980 * procedure without committing the 1981 * ttvn change. This will avoid to send 1982 * corrupted data on tt_request 1983 */ 1984 return; 1985 } 1986 } 1987 orig_node->tt_initialised = true; 1988 } 1989 1990 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, 1991 struct batadv_tt_query_packet *tt_response) 1992 { 1993 struct batadv_orig_node *orig_node; 1994 1995 orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); 1996 if (!orig_node) 1997 goto out; 1998 1999 /* Purge the old table first.. */ 2000 batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); 2001 2002 _batadv_tt_update_changes(bat_priv, orig_node, 2003 (struct batadv_tt_change *)(tt_response + 1), 2004 ntohs(tt_response->tt_data), 2005 tt_response->ttvn); 2006 2007 spin_lock_bh(&orig_node->tt_buff_lock); 2008 kfree(orig_node->tt_buff); 2009 orig_node->tt_buff_len = 0; 2010 orig_node->tt_buff = NULL; 2011 spin_unlock_bh(&orig_node->tt_buff_lock); 2012 2013 atomic_set(&orig_node->last_ttvn, tt_response->ttvn); 2014 2015 out: 2016 if (orig_node) 2017 batadv_orig_node_free_ref(orig_node); 2018 } 2019 2020 static void batadv_tt_update_changes(struct batadv_priv *bat_priv, 2021 struct batadv_orig_node *orig_node, 2022 uint16_t tt_num_changes, uint8_t ttvn, 2023 struct batadv_tt_change *tt_change) 2024 { 2025 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, 2026 tt_num_changes, ttvn); 2027 2028 batadv_tt_save_orig_buffer(bat_priv, orig_node, 2029 (unsigned char *)tt_change, tt_num_changes); 2030 atomic_set(&orig_node->last_ttvn, ttvn); 2031 } 2032 2033 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr) 2034 { 2035 struct batadv_tt_local_entry *tt_local_entry; 2036 bool ret = false; 2037 2038 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); 2039 if (!tt_local_entry) 2040 goto out; 2041 /* Check if the client has been logically deleted (but is kept for 2042 * consistency purpose) 2043 */ 2044 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) || 2045 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM)) 2046 goto out; 2047 ret = true; 2048 out: 2049 if (tt_local_entry) 2050 batadv_tt_local_entry_free_ref(tt_local_entry); 2051 return ret; 2052 } 2053 2054 void batadv_handle_tt_response(struct batadv_priv *bat_priv, 2055 struct batadv_tt_query_packet *tt_response) 2056 { 2057 struct batadv_tt_req_node *node, *safe; 2058 struct batadv_orig_node *orig_node = NULL; 2059 struct batadv_tt_change *tt_change; 2060 2061 batadv_dbg(BATADV_DBG_TT, bat_priv, 2062 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", 2063 tt_response->src, tt_response->ttvn, 2064 ntohs(tt_response->tt_data), 2065 (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); 2066 2067 /* we should have never asked a backbone gw */ 2068 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src)) 2069 goto out; 2070 2071 orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); 2072 if (!orig_node) 2073 goto out; 2074 2075 if (tt_response->flags & BATADV_TT_FULL_TABLE) { 2076 batadv_tt_fill_gtable(bat_priv, tt_response); 2077 } else { 2078 tt_change = (struct batadv_tt_change *)(tt_response + 1); 2079 batadv_tt_update_changes(bat_priv, orig_node, 2080 ntohs(tt_response->tt_data), 2081 tt_response->ttvn, tt_change); 2082 } 2083 2084 /* Delete the tt_req_node from pending tt_requests list */ 2085 spin_lock_bh(&bat_priv->tt.req_list_lock); 2086 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { 2087 if (!batadv_compare_eth(node->addr, tt_response->src)) 2088 continue; 2089 list_del(&node->list); 2090 kfree(node); 2091 } 2092 spin_unlock_bh(&bat_priv->tt.req_list_lock); 2093 2094 /* Recalculate the CRC for this orig_node and store it */ 2095 orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); 2096 out: 2097 if (orig_node) 2098 batadv_orig_node_free_ref(orig_node); 2099 } 2100 2101 int batadv_tt_init(struct batadv_priv *bat_priv) 2102 { 2103 int ret; 2104 2105 ret = batadv_tt_local_init(bat_priv); 2106 if (ret < 0) 2107 return ret; 2108 2109 ret = batadv_tt_global_init(bat_priv); 2110 if (ret < 0) 2111 return ret; 2112 2113 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge); 2114 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, 2115 msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); 2116 2117 return 1; 2118 } 2119 2120 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) 2121 { 2122 struct batadv_tt_roam_node *node, *safe; 2123 2124 spin_lock_bh(&bat_priv->tt.roam_list_lock); 2125 2126 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { 2127 list_del(&node->list); 2128 kfree(node); 2129 } 2130 2131 spin_unlock_bh(&bat_priv->tt.roam_list_lock); 2132 } 2133 2134 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) 2135 { 2136 struct batadv_tt_roam_node *node, *safe; 2137 2138 spin_lock_bh(&bat_priv->tt.roam_list_lock); 2139 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { 2140 if (!batadv_has_timed_out(node->first_time, 2141 BATADV_ROAMING_MAX_TIME)) 2142 continue; 2143 2144 list_del(&node->list); 2145 kfree(node); 2146 } 2147 spin_unlock_bh(&bat_priv->tt.roam_list_lock); 2148 } 2149 2150 /* This function checks whether the client already reached the 2151 * maximum number of possible roaming phases. In this case the ROAMING_ADV 2152 * will not be sent. 2153 * 2154 * returns true if the ROAMING_ADV can be sent, false otherwise 2155 */ 2156 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, 2157 uint8_t *client) 2158 { 2159 struct batadv_tt_roam_node *tt_roam_node; 2160 bool ret = false; 2161 2162 spin_lock_bh(&bat_priv->tt.roam_list_lock); 2163 /* The new tt_req will be issued only if I'm not waiting for a 2164 * reply from the same orig_node yet 2165 */ 2166 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) { 2167 if (!batadv_compare_eth(tt_roam_node->addr, client)) 2168 continue; 2169 2170 if (batadv_has_timed_out(tt_roam_node->first_time, 2171 BATADV_ROAMING_MAX_TIME)) 2172 continue; 2173 2174 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) 2175 /* Sorry, you roamed too many times! */ 2176 goto unlock; 2177 ret = true; 2178 break; 2179 } 2180 2181 if (!ret) { 2182 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); 2183 if (!tt_roam_node) 2184 goto unlock; 2185 2186 tt_roam_node->first_time = jiffies; 2187 atomic_set(&tt_roam_node->counter, 2188 BATADV_ROAMING_MAX_COUNT - 1); 2189 memcpy(tt_roam_node->addr, client, ETH_ALEN); 2190 2191 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list); 2192 ret = true; 2193 } 2194 2195 unlock: 2196 spin_unlock_bh(&bat_priv->tt.roam_list_lock); 2197 return ret; 2198 } 2199 2200 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, 2201 struct batadv_orig_node *orig_node) 2202 { 2203 struct sk_buff *skb = NULL; 2204 struct batadv_roam_adv_packet *roam_adv_packet; 2205 int ret = 1; 2206 struct batadv_hard_iface *primary_if; 2207 size_t len = sizeof(*roam_adv_packet); 2208 2209 /* before going on we have to check whether the client has 2210 * already roamed to us too many times 2211 */ 2212 if (!batadv_tt_check_roam_count(bat_priv, client)) 2213 goto out; 2214 2215 skb = dev_alloc_skb(sizeof(*roam_adv_packet) + ETH_HLEN + NET_IP_ALIGN); 2216 if (!skb) 2217 goto out; 2218 2219 skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); 2220 2221 roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len); 2222 2223 roam_adv_packet->header.packet_type = BATADV_ROAM_ADV; 2224 roam_adv_packet->header.version = BATADV_COMPAT_VERSION; 2225 roam_adv_packet->header.ttl = BATADV_TTL; 2226 roam_adv_packet->reserved = 0; 2227 primary_if = batadv_primary_if_get_selected(bat_priv); 2228 if (!primary_if) 2229 goto out; 2230 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); 2231 batadv_hardif_free_ref(primary_if); 2232 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); 2233 memcpy(roam_adv_packet->client, client, ETH_ALEN); 2234 2235 batadv_dbg(BATADV_DBG_TT, bat_priv, 2236 "Sending ROAMING_ADV to %pM (client %pM)\n", 2237 orig_node->orig, client); 2238 2239 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); 2240 2241 if (batadv_send_skb_to_orig(skb, orig_node, NULL)) 2242 ret = 0; 2243 2244 out: 2245 if (ret && skb) 2246 kfree_skb(skb); 2247 return; 2248 } 2249 2250 static void batadv_tt_purge(struct work_struct *work) 2251 { 2252 struct delayed_work *delayed_work; 2253 struct batadv_priv_tt *priv_tt; 2254 struct batadv_priv *bat_priv; 2255 2256 delayed_work = container_of(work, struct delayed_work, work); 2257 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work); 2258 bat_priv = container_of(priv_tt, struct batadv_priv, tt); 2259 2260 batadv_tt_local_purge(bat_priv); 2261 batadv_tt_global_purge(bat_priv); 2262 batadv_tt_req_purge(bat_priv); 2263 batadv_tt_roam_purge(bat_priv); 2264 2265 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, 2266 msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); 2267 } 2268 2269 void batadv_tt_free(struct batadv_priv *bat_priv) 2270 { 2271 cancel_delayed_work_sync(&bat_priv->tt.work); 2272 2273 batadv_tt_local_table_free(bat_priv); 2274 batadv_tt_global_table_free(bat_priv); 2275 batadv_tt_req_list_free(bat_priv); 2276 batadv_tt_changes_list_free(bat_priv); 2277 batadv_tt_roam_list_free(bat_priv); 2278 2279 kfree(bat_priv->tt.last_changeset); 2280 } 2281 2282 /* This function will enable or disable the specified flags for all the entries 2283 * in the given hash table and returns the number of modified entries 2284 */ 2285 static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash, 2286 uint16_t flags, bool enable) 2287 { 2288 uint32_t i; 2289 uint16_t changed_num = 0; 2290 struct hlist_head *head; 2291 struct batadv_tt_common_entry *tt_common_entry; 2292 2293 if (!hash) 2294 goto out; 2295 2296 for (i = 0; i < hash->size; i++) { 2297 head = &hash->table[i]; 2298 2299 rcu_read_lock(); 2300 hlist_for_each_entry_rcu(tt_common_entry, 2301 head, hash_entry) { 2302 if (enable) { 2303 if ((tt_common_entry->flags & flags) == flags) 2304 continue; 2305 tt_common_entry->flags |= flags; 2306 } else { 2307 if (!(tt_common_entry->flags & flags)) 2308 continue; 2309 tt_common_entry->flags &= ~flags; 2310 } 2311 changed_num++; 2312 } 2313 rcu_read_unlock(); 2314 } 2315 out: 2316 return changed_num; 2317 } 2318 2319 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ 2320 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) 2321 { 2322 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 2323 struct batadv_tt_common_entry *tt_common; 2324 struct batadv_tt_local_entry *tt_local; 2325 struct hlist_node *node_tmp; 2326 struct hlist_head *head; 2327 spinlock_t *list_lock; /* protects write access to the hash lists */ 2328 uint32_t i; 2329 2330 if (!hash) 2331 return; 2332 2333 for (i = 0; i < hash->size; i++) { 2334 head = &hash->table[i]; 2335 list_lock = &hash->list_locks[i]; 2336 2337 spin_lock_bh(list_lock); 2338 hlist_for_each_entry_safe(tt_common, node_tmp, head, 2339 hash_entry) { 2340 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) 2341 continue; 2342 2343 batadv_dbg(BATADV_DBG_TT, bat_priv, 2344 "Deleting local tt entry (%pM): pending\n", 2345 tt_common->addr); 2346 2347 atomic_dec(&bat_priv->tt.local_entry_num); 2348 hlist_del_rcu(&tt_common->hash_entry); 2349 tt_local = container_of(tt_common, 2350 struct batadv_tt_local_entry, 2351 common); 2352 batadv_tt_local_entry_free_ref(tt_local); 2353 } 2354 spin_unlock_bh(list_lock); 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: %#.4x last_crc: %#.4x 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 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, 2555 struct batadv_orig_node *orig_node, 2556 const unsigned char *addr) 2557 { 2558 bool ret = false; 2559 2560 /* if the originator is a backbone node (meaning it belongs to the same 2561 * LAN of this node) the temporary client must not be added because to 2562 * reach such destination the node must use the LAN instead of the mesh 2563 */ 2564 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) 2565 goto out; 2566 2567 if (!batadv_tt_global_add(bat_priv, orig_node, addr, 2568 BATADV_TT_CLIENT_TEMP, 2569 atomic_read(&orig_node->last_ttvn))) 2570 goto out; 2571 2572 batadv_dbg(BATADV_DBG_TT, bat_priv, 2573 "Added temporary global client (addr: %pM orig: %pM)\n", 2574 addr, orig_node->orig); 2575 ret = true; 2576 out: 2577 return ret; 2578 } 2579