1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) B.A.T.M.A.N. contributors: 3 * 4 * Marek Lindner, Simon Wunderlich, Antonio Quartulli 5 */ 6 7 #include "translation-table.h" 8 #include "main.h" 9 10 #include <linux/atomic.h> 11 #include <linux/bitops.h> 12 #include <linux/build_bug.h> 13 #include <linux/byteorder/generic.h> 14 #include <linux/cache.h> 15 #include <linux/compiler.h> 16 #include <linux/crc32c.h> 17 #include <linux/errno.h> 18 #include <linux/etherdevice.h> 19 #include <linux/gfp.h> 20 #include <linux/if_ether.h> 21 #include <linux/init.h> 22 #include <linux/jhash.h> 23 #include <linux/jiffies.h> 24 #include <linux/kernel.h> 25 #include <linux/kref.h> 26 #include <linux/list.h> 27 #include <linux/lockdep.h> 28 #include <linux/net.h> 29 #include <linux/netdevice.h> 30 #include <linux/netlink.h> 31 #include <linux/rculist.h> 32 #include <linux/rcupdate.h> 33 #include <linux/skbuff.h> 34 #include <linux/slab.h> 35 #include <linux/spinlock.h> 36 #include <linux/stddef.h> 37 #include <linux/string.h> 38 #include <linux/workqueue.h> 39 #include <net/genetlink.h> 40 #include <net/netlink.h> 41 #include <net/sock.h> 42 #include <uapi/linux/batadv_packet.h> 43 #include <uapi/linux/batman_adv.h> 44 45 #include "bridge_loop_avoidance.h" 46 #include "hard-interface.h" 47 #include "hash.h" 48 #include "log.h" 49 #include "netlink.h" 50 #include "originator.h" 51 #include "soft-interface.h" 52 #include "tvlv.h" 53 54 static struct kmem_cache *batadv_tl_cache __read_mostly; 55 static struct kmem_cache *batadv_tg_cache __read_mostly; 56 static struct kmem_cache *batadv_tt_orig_cache __read_mostly; 57 static struct kmem_cache *batadv_tt_change_cache __read_mostly; 58 static struct kmem_cache *batadv_tt_req_cache __read_mostly; 59 static struct kmem_cache *batadv_tt_roam_cache __read_mostly; 60 61 /* hash class keys */ 62 static struct lock_class_key batadv_tt_local_hash_lock_class_key; 63 static struct lock_class_key batadv_tt_global_hash_lock_class_key; 64 65 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client, 66 unsigned short vid, 67 struct batadv_orig_node *orig_node); 68 static void batadv_tt_purge(struct work_struct *work); 69 static void 70 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry); 71 static void batadv_tt_global_del(struct batadv_priv *bat_priv, 72 struct batadv_orig_node *orig_node, 73 const unsigned char *addr, 74 unsigned short vid, const char *message, 75 bool roaming); 76 77 /** 78 * batadv_compare_tt() - check if two TT entries are the same 79 * @node: the list element pointer of the first TT entry 80 * @data2: pointer to the tt_common_entry of the second TT entry 81 * 82 * Compare the MAC address and the VLAN ID of the two TT entries and check if 83 * they are the same TT client. 84 * Return: true if the two TT clients are the same, false otherwise 85 */ 86 static bool batadv_compare_tt(const struct hlist_node *node, const void *data2) 87 { 88 const void *data1 = container_of(node, struct batadv_tt_common_entry, 89 hash_entry); 90 const struct batadv_tt_common_entry *tt1 = data1; 91 const struct batadv_tt_common_entry *tt2 = data2; 92 93 return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2); 94 } 95 96 /** 97 * batadv_choose_tt() - return the index of the tt entry in the hash table 98 * @data: pointer to the tt_common_entry object to map 99 * @size: the size of the hash table 100 * 101 * Return: the hash index where the object represented by 'data' should be 102 * stored at. 103 */ 104 static inline u32 batadv_choose_tt(const void *data, u32 size) 105 { 106 struct batadv_tt_common_entry *tt; 107 u32 hash = 0; 108 109 tt = (struct batadv_tt_common_entry *)data; 110 hash = jhash(&tt->addr, ETH_ALEN, hash); 111 hash = jhash(&tt->vid, sizeof(tt->vid), hash); 112 113 return hash % size; 114 } 115 116 /** 117 * batadv_tt_hash_find() - look for a client in the given hash table 118 * @hash: the hash table to search 119 * @addr: the mac address of the client to look for 120 * @vid: VLAN identifier 121 * 122 * Return: a pointer to the tt_common struct belonging to the searched client if 123 * found, NULL otherwise. 124 */ 125 static struct batadv_tt_common_entry * 126 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr, 127 unsigned short vid) 128 { 129 struct hlist_head *head; 130 struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL; 131 u32 index; 132 133 if (!hash) 134 return NULL; 135 136 ether_addr_copy(to_search.addr, addr); 137 to_search.vid = vid; 138 139 index = batadv_choose_tt(&to_search, hash->size); 140 head = &hash->table[index]; 141 142 rcu_read_lock(); 143 hlist_for_each_entry_rcu(tt, head, hash_entry) { 144 if (!batadv_compare_eth(tt, addr)) 145 continue; 146 147 if (tt->vid != vid) 148 continue; 149 150 if (!kref_get_unless_zero(&tt->refcount)) 151 continue; 152 153 tt_tmp = tt; 154 break; 155 } 156 rcu_read_unlock(); 157 158 return tt_tmp; 159 } 160 161 /** 162 * batadv_tt_local_hash_find() - search the local table for a given client 163 * @bat_priv: the bat priv with all the soft interface information 164 * @addr: the mac address of the client to look for 165 * @vid: VLAN identifier 166 * 167 * Return: a pointer to the corresponding tt_local_entry struct if the client is 168 * found, NULL otherwise. 169 */ 170 static struct batadv_tt_local_entry * 171 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr, 172 unsigned short vid) 173 { 174 struct batadv_tt_common_entry *tt_common_entry; 175 struct batadv_tt_local_entry *tt_local_entry = NULL; 176 177 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr, 178 vid); 179 if (tt_common_entry) 180 tt_local_entry = container_of(tt_common_entry, 181 struct batadv_tt_local_entry, 182 common); 183 return tt_local_entry; 184 } 185 186 /** 187 * batadv_tt_global_hash_find() - search the global table for a given client 188 * @bat_priv: the bat priv with all the soft interface information 189 * @addr: the mac address of the client to look for 190 * @vid: VLAN identifier 191 * 192 * Return: a pointer to the corresponding tt_global_entry struct if the client 193 * is found, NULL otherwise. 194 */ 195 struct batadv_tt_global_entry * 196 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr, 197 unsigned short vid) 198 { 199 struct batadv_tt_common_entry *tt_common_entry; 200 struct batadv_tt_global_entry *tt_global_entry = NULL; 201 202 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr, 203 vid); 204 if (tt_common_entry) 205 tt_global_entry = container_of(tt_common_entry, 206 struct batadv_tt_global_entry, 207 common); 208 return tt_global_entry; 209 } 210 211 /** 212 * batadv_tt_local_entry_free_rcu() - free the tt_local_entry 213 * @rcu: rcu pointer of the tt_local_entry 214 */ 215 static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu) 216 { 217 struct batadv_tt_local_entry *tt_local_entry; 218 219 tt_local_entry = container_of(rcu, struct batadv_tt_local_entry, 220 common.rcu); 221 222 kmem_cache_free(batadv_tl_cache, tt_local_entry); 223 } 224 225 /** 226 * batadv_tt_local_entry_release() - release tt_local_entry from lists and queue 227 * for free after rcu grace period 228 * @ref: kref pointer of the nc_node 229 */ 230 static void batadv_tt_local_entry_release(struct kref *ref) 231 { 232 struct batadv_tt_local_entry *tt_local_entry; 233 234 tt_local_entry = container_of(ref, struct batadv_tt_local_entry, 235 common.refcount); 236 237 batadv_softif_vlan_put(tt_local_entry->vlan); 238 239 call_rcu(&tt_local_entry->common.rcu, batadv_tt_local_entry_free_rcu); 240 } 241 242 /** 243 * batadv_tt_local_entry_put() - decrement the tt_local_entry refcounter and 244 * possibly release it 245 * @tt_local_entry: tt_local_entry to be free'd 246 */ 247 static void 248 batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry) 249 { 250 kref_put(&tt_local_entry->common.refcount, 251 batadv_tt_local_entry_release); 252 } 253 254 /** 255 * batadv_tt_global_entry_free_rcu() - free the tt_global_entry 256 * @rcu: rcu pointer of the tt_global_entry 257 */ 258 static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) 259 { 260 struct batadv_tt_global_entry *tt_global_entry; 261 262 tt_global_entry = container_of(rcu, struct batadv_tt_global_entry, 263 common.rcu); 264 265 kmem_cache_free(batadv_tg_cache, tt_global_entry); 266 } 267 268 /** 269 * batadv_tt_global_entry_release() - release tt_global_entry from lists and 270 * queue for free after rcu grace period 271 * @ref: kref pointer of the nc_node 272 */ 273 static void batadv_tt_global_entry_release(struct kref *ref) 274 { 275 struct batadv_tt_global_entry *tt_global_entry; 276 277 tt_global_entry = container_of(ref, struct batadv_tt_global_entry, 278 common.refcount); 279 280 batadv_tt_global_del_orig_list(tt_global_entry); 281 282 call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu); 283 } 284 285 /** 286 * batadv_tt_global_entry_put() - decrement the tt_global_entry refcounter and 287 * possibly release it 288 * @tt_global_entry: tt_global_entry to be free'd 289 */ 290 void batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry) 291 { 292 kref_put(&tt_global_entry->common.refcount, 293 batadv_tt_global_entry_release); 294 } 295 296 /** 297 * batadv_tt_global_hash_count() - count the number of orig entries 298 * @bat_priv: the bat priv with all the soft interface information 299 * @addr: the mac address of the client to count entries for 300 * @vid: VLAN identifier 301 * 302 * Return: the number of originators advertising the given address/data 303 * (excluding our self). 304 */ 305 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv, 306 const u8 *addr, unsigned short vid) 307 { 308 struct batadv_tt_global_entry *tt_global_entry; 309 int count; 310 311 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid); 312 if (!tt_global_entry) 313 return 0; 314 315 count = atomic_read(&tt_global_entry->orig_list_count); 316 batadv_tt_global_entry_put(tt_global_entry); 317 318 return count; 319 } 320 321 /** 322 * batadv_tt_local_size_mod() - change the size by v of the local table 323 * identified by vid 324 * @bat_priv: the bat priv with all the soft interface information 325 * @vid: the VLAN identifier of the sub-table to change 326 * @v: the amount to sum to the local table size 327 */ 328 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv, 329 unsigned short vid, int v) 330 { 331 struct batadv_softif_vlan *vlan; 332 333 vlan = batadv_softif_vlan_get(bat_priv, vid); 334 if (!vlan) 335 return; 336 337 atomic_add(v, &vlan->tt.num_entries); 338 339 batadv_softif_vlan_put(vlan); 340 } 341 342 /** 343 * batadv_tt_local_size_inc() - increase by one the local table size for the 344 * given vid 345 * @bat_priv: the bat priv with all the soft interface information 346 * @vid: the VLAN identifier 347 */ 348 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv, 349 unsigned short vid) 350 { 351 batadv_tt_local_size_mod(bat_priv, vid, 1); 352 } 353 354 /** 355 * batadv_tt_local_size_dec() - decrease by one the local table size for the 356 * given vid 357 * @bat_priv: the bat priv with all the soft interface information 358 * @vid: the VLAN identifier 359 */ 360 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv, 361 unsigned short vid) 362 { 363 batadv_tt_local_size_mod(bat_priv, vid, -1); 364 } 365 366 /** 367 * batadv_tt_global_size_mod() - change the size by v of the global table 368 * for orig_node identified by vid 369 * @orig_node: the originator for which the table has to be modified 370 * @vid: the VLAN identifier 371 * @v: the amount to sum to the global table size 372 */ 373 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node, 374 unsigned short vid, int v) 375 { 376 struct batadv_orig_node_vlan *vlan; 377 378 vlan = batadv_orig_node_vlan_new(orig_node, vid); 379 if (!vlan) 380 return; 381 382 if (atomic_add_return(v, &vlan->tt.num_entries) == 0) { 383 spin_lock_bh(&orig_node->vlan_list_lock); 384 if (!hlist_unhashed(&vlan->list)) { 385 hlist_del_init_rcu(&vlan->list); 386 batadv_orig_node_vlan_put(vlan); 387 } 388 spin_unlock_bh(&orig_node->vlan_list_lock); 389 } 390 391 batadv_orig_node_vlan_put(vlan); 392 } 393 394 /** 395 * batadv_tt_global_size_inc() - increase by one the global table size for the 396 * given vid 397 * @orig_node: the originator which global table size has to be decreased 398 * @vid: the vlan identifier 399 */ 400 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node, 401 unsigned short vid) 402 { 403 batadv_tt_global_size_mod(orig_node, vid, 1); 404 } 405 406 /** 407 * batadv_tt_global_size_dec() - decrease by one the global table size for the 408 * given vid 409 * @orig_node: the originator which global table size has to be decreased 410 * @vid: the vlan identifier 411 */ 412 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node, 413 unsigned short vid) 414 { 415 batadv_tt_global_size_mod(orig_node, vid, -1); 416 } 417 418 /** 419 * batadv_tt_orig_list_entry_free_rcu() - free the orig_entry 420 * @rcu: rcu pointer of the orig_entry 421 */ 422 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) 423 { 424 struct batadv_tt_orig_list_entry *orig_entry; 425 426 orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu); 427 428 kmem_cache_free(batadv_tt_orig_cache, orig_entry); 429 } 430 431 /** 432 * batadv_tt_orig_list_entry_release() - release tt orig entry from lists and 433 * queue for free after rcu grace period 434 * @ref: kref pointer of the tt orig entry 435 */ 436 static void batadv_tt_orig_list_entry_release(struct kref *ref) 437 { 438 struct batadv_tt_orig_list_entry *orig_entry; 439 440 orig_entry = container_of(ref, struct batadv_tt_orig_list_entry, 441 refcount); 442 443 batadv_orig_node_put(orig_entry->orig_node); 444 call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu); 445 } 446 447 /** 448 * batadv_tt_orig_list_entry_put() - decrement the tt orig entry refcounter and 449 * possibly release it 450 * @orig_entry: tt orig entry to be free'd 451 */ 452 static void 453 batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry) 454 { 455 kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release); 456 } 457 458 /** 459 * batadv_tt_local_event() - store a local TT event (ADD/DEL) 460 * @bat_priv: the bat priv with all the soft interface information 461 * @tt_local_entry: the TT entry involved in the event 462 * @event_flags: flags to store in the event structure 463 */ 464 static void batadv_tt_local_event(struct batadv_priv *bat_priv, 465 struct batadv_tt_local_entry *tt_local_entry, 466 u8 event_flags) 467 { 468 struct batadv_tt_change_node *tt_change_node, *entry, *safe; 469 struct batadv_tt_common_entry *common = &tt_local_entry->common; 470 u8 flags = common->flags | event_flags; 471 bool event_removed = false; 472 bool del_op_requested, del_op_entry; 473 474 tt_change_node = kmem_cache_alloc(batadv_tt_change_cache, GFP_ATOMIC); 475 if (!tt_change_node) 476 return; 477 478 tt_change_node->change.flags = flags; 479 memset(tt_change_node->change.reserved, 0, 480 sizeof(tt_change_node->change.reserved)); 481 ether_addr_copy(tt_change_node->change.addr, common->addr); 482 tt_change_node->change.vid = htons(common->vid); 483 484 del_op_requested = flags & BATADV_TT_CLIENT_DEL; 485 486 /* check for ADD+DEL or DEL+ADD events */ 487 spin_lock_bh(&bat_priv->tt.changes_list_lock); 488 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, 489 list) { 490 if (!batadv_compare_eth(entry->change.addr, common->addr)) 491 continue; 492 493 /* DEL+ADD in the same orig interval have no effect and can be 494 * removed to avoid silly behaviour on the receiver side. The 495 * other way around (ADD+DEL) can happen in case of roaming of 496 * a client still in the NEW state. Roaming of NEW clients is 497 * now possible due to automatically recognition of "temporary" 498 * clients 499 */ 500 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL; 501 if (!del_op_requested && del_op_entry) 502 goto del; 503 if (del_op_requested && !del_op_entry) 504 goto del; 505 506 /* this is a second add in the same originator interval. It 507 * means that flags have been changed: update them! 508 */ 509 if (!del_op_requested && !del_op_entry) 510 entry->change.flags = flags; 511 512 continue; 513 del: 514 list_del(&entry->list); 515 kmem_cache_free(batadv_tt_change_cache, entry); 516 kmem_cache_free(batadv_tt_change_cache, tt_change_node); 517 event_removed = true; 518 goto unlock; 519 } 520 521 /* track the change in the OGMinterval list */ 522 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list); 523 524 unlock: 525 spin_unlock_bh(&bat_priv->tt.changes_list_lock); 526 527 if (event_removed) 528 atomic_dec(&bat_priv->tt.local_changes); 529 else 530 atomic_inc(&bat_priv->tt.local_changes); 531 } 532 533 /** 534 * batadv_tt_len() - compute length in bytes of given number of tt changes 535 * @changes_num: number of tt changes 536 * 537 * Return: computed length in bytes. 538 */ 539 static int batadv_tt_len(int changes_num) 540 { 541 return changes_num * sizeof(struct batadv_tvlv_tt_change); 542 } 543 544 /** 545 * batadv_tt_entries() - compute the number of entries fitting in tt_len bytes 546 * @tt_len: available space 547 * 548 * Return: the number of entries. 549 */ 550 static u16 batadv_tt_entries(u16 tt_len) 551 { 552 return tt_len / batadv_tt_len(1); 553 } 554 555 /** 556 * batadv_tt_local_table_transmit_size() - calculates the local translation 557 * table size when transmitted over the air 558 * @bat_priv: the bat priv with all the soft interface information 559 * 560 * Return: local translation table size in bytes. 561 */ 562 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv) 563 { 564 u16 num_vlan = 0; 565 u16 tt_local_entries = 0; 566 struct batadv_softif_vlan *vlan; 567 int hdr_size; 568 569 rcu_read_lock(); 570 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { 571 num_vlan++; 572 tt_local_entries += atomic_read(&vlan->tt.num_entries); 573 } 574 rcu_read_unlock(); 575 576 /* header size of tvlv encapsulated tt response payload */ 577 hdr_size = sizeof(struct batadv_unicast_tvlv_packet); 578 hdr_size += sizeof(struct batadv_tvlv_hdr); 579 hdr_size += sizeof(struct batadv_tvlv_tt_data); 580 hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data); 581 582 return hdr_size + batadv_tt_len(tt_local_entries); 583 } 584 585 static int batadv_tt_local_init(struct batadv_priv *bat_priv) 586 { 587 if (bat_priv->tt.local_hash) 588 return 0; 589 590 bat_priv->tt.local_hash = batadv_hash_new(1024); 591 592 if (!bat_priv->tt.local_hash) 593 return -ENOMEM; 594 595 batadv_hash_set_lock_class(bat_priv->tt.local_hash, 596 &batadv_tt_local_hash_lock_class_key); 597 598 return 0; 599 } 600 601 static void batadv_tt_global_free(struct batadv_priv *bat_priv, 602 struct batadv_tt_global_entry *tt_global, 603 const char *message) 604 { 605 struct batadv_tt_global_entry *tt_removed_entry; 606 struct hlist_node *tt_removed_node; 607 608 batadv_dbg(BATADV_DBG_TT, bat_priv, 609 "Deleting global tt entry %pM (vid: %d): %s\n", 610 tt_global->common.addr, 611 batadv_print_vid(tt_global->common.vid), message); 612 613 tt_removed_node = batadv_hash_remove(bat_priv->tt.global_hash, 614 batadv_compare_tt, 615 batadv_choose_tt, 616 &tt_global->common); 617 if (!tt_removed_node) 618 return; 619 620 /* drop reference of remove hash entry */ 621 tt_removed_entry = hlist_entry(tt_removed_node, 622 struct batadv_tt_global_entry, 623 common.hash_entry); 624 batadv_tt_global_entry_put(tt_removed_entry); 625 } 626 627 /** 628 * batadv_tt_local_add() - add a new client to the local table or update an 629 * existing client 630 * @soft_iface: netdev struct of the mesh interface 631 * @addr: the mac address of the client to add 632 * @vid: VLAN identifier 633 * @ifindex: index of the interface where the client is connected to (useful to 634 * identify wireless clients) 635 * @mark: the value contained in the skb->mark field of the received packet (if 636 * any) 637 * 638 * Return: true if the client was successfully added, false otherwise. 639 */ 640 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr, 641 unsigned short vid, int ifindex, u32 mark) 642 { 643 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 644 struct batadv_tt_local_entry *tt_local; 645 struct batadv_tt_global_entry *tt_global = NULL; 646 struct net *net = dev_net(soft_iface); 647 struct batadv_softif_vlan *vlan; 648 struct net_device *in_dev = NULL; 649 struct batadv_hard_iface *in_hardif = NULL; 650 struct hlist_head *head; 651 struct batadv_tt_orig_list_entry *orig_entry; 652 int hash_added, table_size, packet_size_max; 653 bool ret = false; 654 bool roamed_back = false; 655 u8 remote_flags; 656 u32 match_mark; 657 658 if (ifindex != BATADV_NULL_IFINDEX) 659 in_dev = dev_get_by_index(net, ifindex); 660 661 if (in_dev) 662 in_hardif = batadv_hardif_get_by_netdev(in_dev); 663 664 tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid); 665 666 if (!is_multicast_ether_addr(addr)) 667 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid); 668 669 if (tt_local) { 670 tt_local->last_seen = jiffies; 671 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) { 672 batadv_dbg(BATADV_DBG_TT, bat_priv, 673 "Re-adding pending client %pM (vid: %d)\n", 674 addr, batadv_print_vid(vid)); 675 /* whatever the reason why the PENDING flag was set, 676 * this is a client which was enqueued to be removed in 677 * this orig_interval. Since it popped up again, the 678 * flag can be reset like it was never enqueued 679 */ 680 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING; 681 goto add_event; 682 } 683 684 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) { 685 batadv_dbg(BATADV_DBG_TT, bat_priv, 686 "Roaming client %pM (vid: %d) came back to its original location\n", 687 addr, batadv_print_vid(vid)); 688 /* the ROAM flag is set because this client roamed away 689 * and the node got a roaming_advertisement message. Now 690 * that the client popped up again at its original 691 * location such flag can be unset 692 */ 693 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM; 694 roamed_back = true; 695 } 696 goto check_roaming; 697 } 698 699 /* Ignore the client if we cannot send it in a full table response. */ 700 table_size = batadv_tt_local_table_transmit_size(bat_priv); 701 table_size += batadv_tt_len(1); 702 packet_size_max = atomic_read(&bat_priv->packet_size_max); 703 if (table_size > packet_size_max) { 704 net_ratelimited_function(batadv_info, soft_iface, 705 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n", 706 table_size, packet_size_max, addr); 707 goto out; 708 } 709 710 tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC); 711 if (!tt_local) 712 goto out; 713 714 /* increase the refcounter of the related vlan */ 715 vlan = batadv_softif_vlan_get(bat_priv, vid); 716 if (!vlan) { 717 net_ratelimited_function(batadv_info, soft_iface, 718 "adding TT local entry %pM to non-existent VLAN %d\n", 719 addr, batadv_print_vid(vid)); 720 kmem_cache_free(batadv_tl_cache, tt_local); 721 tt_local = NULL; 722 goto out; 723 } 724 725 batadv_dbg(BATADV_DBG_TT, bat_priv, 726 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n", 727 addr, batadv_print_vid(vid), 728 (u8)atomic_read(&bat_priv->tt.vn)); 729 730 ether_addr_copy(tt_local->common.addr, addr); 731 /* The local entry has to be marked as NEW to avoid to send it in 732 * a full table response going out before the next ttvn increment 733 * (consistency check) 734 */ 735 tt_local->common.flags = BATADV_TT_CLIENT_NEW; 736 tt_local->common.vid = vid; 737 if (batadv_is_wifi_hardif(in_hardif)) 738 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; 739 kref_init(&tt_local->common.refcount); 740 tt_local->last_seen = jiffies; 741 tt_local->common.added_at = tt_local->last_seen; 742 tt_local->vlan = vlan; 743 744 /* the batman interface mac and multicast addresses should never be 745 * purged 746 */ 747 if (batadv_compare_eth(addr, soft_iface->dev_addr) || 748 is_multicast_ether_addr(addr)) 749 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE; 750 751 kref_get(&tt_local->common.refcount); 752 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt, 753 batadv_choose_tt, &tt_local->common, 754 &tt_local->common.hash_entry); 755 756 if (unlikely(hash_added != 0)) { 757 /* remove the reference for the hash */ 758 batadv_tt_local_entry_put(tt_local); 759 goto out; 760 } 761 762 add_event: 763 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS); 764 765 check_roaming: 766 /* Check whether it is a roaming, but don't do anything if the roaming 767 * process has already been handled 768 */ 769 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) { 770 /* These node are probably going to update their tt table */ 771 head = &tt_global->orig_list; 772 rcu_read_lock(); 773 hlist_for_each_entry_rcu(orig_entry, head, list) { 774 batadv_send_roam_adv(bat_priv, tt_global->common.addr, 775 tt_global->common.vid, 776 orig_entry->orig_node); 777 } 778 rcu_read_unlock(); 779 if (roamed_back) { 780 batadv_tt_global_free(bat_priv, tt_global, 781 "Roaming canceled"); 782 tt_global = NULL; 783 } else { 784 /* The global entry has to be marked as ROAMING and 785 * has to be kept for consistency purpose 786 */ 787 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM; 788 tt_global->roam_at = jiffies; 789 } 790 } 791 792 /* store the current remote flags before altering them. This helps 793 * understanding is flags are changing or not 794 */ 795 remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK; 796 797 if (batadv_is_wifi_hardif(in_hardif)) 798 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; 799 else 800 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI; 801 802 /* check the mark in the skb: if it's equal to the configured 803 * isolation_mark, it means the packet is coming from an isolated 804 * non-mesh client 805 */ 806 match_mark = (mark & bat_priv->isolation_mark_mask); 807 if (bat_priv->isolation_mark_mask && 808 match_mark == bat_priv->isolation_mark) 809 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA; 810 else 811 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA; 812 813 /* if any "dynamic" flag has been modified, resend an ADD event for this 814 * entry so that all the nodes can get the new flags 815 */ 816 if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK)) 817 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS); 818 819 ret = true; 820 out: 821 if (in_hardif) 822 batadv_hardif_put(in_hardif); 823 if (in_dev) 824 dev_put(in_dev); 825 if (tt_local) 826 batadv_tt_local_entry_put(tt_local); 827 if (tt_global) 828 batadv_tt_global_entry_put(tt_global); 829 return ret; 830 } 831 832 /** 833 * batadv_tt_prepare_tvlv_global_data() - prepare the TVLV TT header to send 834 * within a TT Response directed to another node 835 * @orig_node: originator for which the TT data has to be prepared 836 * @tt_data: uninitialised pointer to the address of the TVLV buffer 837 * @tt_change: uninitialised pointer to the address of the area where the TT 838 * changed can be stored 839 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this 840 * function reserves the amount of space needed to send the entire global TT 841 * table. In case of success the value is updated with the real amount of 842 * reserved bytes 843 * Allocate the needed amount of memory for the entire TT TVLV and write its 844 * header made up of one tvlv_tt_data object and a series of tvlv_tt_vlan_data 845 * objects, one per active VLAN served by the originator node. 846 * 847 * Return: the size of the allocated buffer or 0 in case of failure. 848 */ 849 static u16 850 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node, 851 struct batadv_tvlv_tt_data **tt_data, 852 struct batadv_tvlv_tt_change **tt_change, 853 s32 *tt_len) 854 { 855 u16 num_vlan = 0; 856 u16 num_entries = 0; 857 u16 change_offset; 858 u16 tvlv_len; 859 struct batadv_tvlv_tt_vlan_data *tt_vlan; 860 struct batadv_orig_node_vlan *vlan; 861 u8 *tt_change_ptr; 862 863 spin_lock_bh(&orig_node->vlan_list_lock); 864 hlist_for_each_entry(vlan, &orig_node->vlan_list, list) { 865 num_vlan++; 866 num_entries += atomic_read(&vlan->tt.num_entries); 867 } 868 869 change_offset = sizeof(**tt_data); 870 change_offset += num_vlan * sizeof(*tt_vlan); 871 872 /* if tt_len is negative, allocate the space needed by the full table */ 873 if (*tt_len < 0) 874 *tt_len = batadv_tt_len(num_entries); 875 876 tvlv_len = *tt_len; 877 tvlv_len += change_offset; 878 879 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC); 880 if (!*tt_data) { 881 *tt_len = 0; 882 goto out; 883 } 884 885 (*tt_data)->flags = BATADV_NO_FLAGS; 886 (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn); 887 (*tt_data)->num_vlan = htons(num_vlan); 888 889 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1); 890 hlist_for_each_entry(vlan, &orig_node->vlan_list, list) { 891 tt_vlan->vid = htons(vlan->vid); 892 tt_vlan->crc = htonl(vlan->tt.crc); 893 tt_vlan->reserved = 0; 894 895 tt_vlan++; 896 } 897 898 tt_change_ptr = (u8 *)*tt_data + change_offset; 899 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr; 900 901 out: 902 spin_unlock_bh(&orig_node->vlan_list_lock); 903 return tvlv_len; 904 } 905 906 /** 907 * batadv_tt_prepare_tvlv_local_data() - allocate and prepare the TT TVLV for 908 * this node 909 * @bat_priv: the bat priv with all the soft interface information 910 * @tt_data: uninitialised pointer to the address of the TVLV buffer 911 * @tt_change: uninitialised pointer to the address of the area where the TT 912 * changes can be stored 913 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this 914 * function reserves the amount of space needed to send the entire local TT 915 * table. In case of success the value is updated with the real amount of 916 * reserved bytes 917 * 918 * Allocate the needed amount of memory for the entire TT TVLV and write its 919 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data 920 * objects, one per active VLAN. 921 * 922 * Return: the size of the allocated buffer or 0 in case of failure. 923 */ 924 static u16 925 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv, 926 struct batadv_tvlv_tt_data **tt_data, 927 struct batadv_tvlv_tt_change **tt_change, 928 s32 *tt_len) 929 { 930 struct batadv_tvlv_tt_vlan_data *tt_vlan; 931 struct batadv_softif_vlan *vlan; 932 u16 num_vlan = 0; 933 u16 vlan_entries = 0; 934 u16 total_entries = 0; 935 u16 tvlv_len; 936 u8 *tt_change_ptr; 937 int change_offset; 938 939 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 940 hlist_for_each_entry(vlan, &bat_priv->softif_vlan_list, list) { 941 vlan_entries = atomic_read(&vlan->tt.num_entries); 942 if (vlan_entries < 1) 943 continue; 944 945 num_vlan++; 946 total_entries += vlan_entries; 947 } 948 949 change_offset = sizeof(**tt_data); 950 change_offset += num_vlan * sizeof(*tt_vlan); 951 952 /* if tt_len is negative, allocate the space needed by the full table */ 953 if (*tt_len < 0) 954 *tt_len = batadv_tt_len(total_entries); 955 956 tvlv_len = *tt_len; 957 tvlv_len += change_offset; 958 959 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC); 960 if (!*tt_data) { 961 tvlv_len = 0; 962 goto out; 963 } 964 965 (*tt_data)->flags = BATADV_NO_FLAGS; 966 (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn); 967 (*tt_data)->num_vlan = htons(num_vlan); 968 969 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1); 970 hlist_for_each_entry(vlan, &bat_priv->softif_vlan_list, list) { 971 vlan_entries = atomic_read(&vlan->tt.num_entries); 972 if (vlan_entries < 1) 973 continue; 974 975 tt_vlan->vid = htons(vlan->vid); 976 tt_vlan->crc = htonl(vlan->tt.crc); 977 tt_vlan->reserved = 0; 978 979 tt_vlan++; 980 } 981 982 tt_change_ptr = (u8 *)*tt_data + change_offset; 983 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr; 984 985 out: 986 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 987 return tvlv_len; 988 } 989 990 /** 991 * batadv_tt_tvlv_container_update() - update the translation table tvlv 992 * container after local tt changes have been committed 993 * @bat_priv: the bat priv with all the soft interface information 994 */ 995 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) 996 { 997 struct batadv_tt_change_node *entry, *safe; 998 struct batadv_tvlv_tt_data *tt_data; 999 struct batadv_tvlv_tt_change *tt_change; 1000 int tt_diff_len, tt_change_len = 0; 1001 int tt_diff_entries_num = 0; 1002 int tt_diff_entries_count = 0; 1003 u16 tvlv_len; 1004 1005 tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes); 1006 tt_diff_len = batadv_tt_len(tt_diff_entries_num); 1007 1008 /* if we have too many changes for one packet don't send any 1009 * and wait for the tt table request which will be fragmented 1010 */ 1011 if (tt_diff_len > bat_priv->soft_iface->mtu) 1012 tt_diff_len = 0; 1013 1014 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data, 1015 &tt_change, &tt_diff_len); 1016 if (!tvlv_len) 1017 return; 1018 1019 tt_data->flags = BATADV_TT_OGM_DIFF; 1020 1021 if (tt_diff_len == 0) 1022 goto container_register; 1023 1024 spin_lock_bh(&bat_priv->tt.changes_list_lock); 1025 atomic_set(&bat_priv->tt.local_changes, 0); 1026 1027 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, 1028 list) { 1029 if (tt_diff_entries_count < tt_diff_entries_num) { 1030 memcpy(tt_change + tt_diff_entries_count, 1031 &entry->change, 1032 sizeof(struct batadv_tvlv_tt_change)); 1033 tt_diff_entries_count++; 1034 } 1035 list_del(&entry->list); 1036 kmem_cache_free(batadv_tt_change_cache, entry); 1037 } 1038 spin_unlock_bh(&bat_priv->tt.changes_list_lock); 1039 1040 /* Keep the buffer for possible tt_request */ 1041 spin_lock_bh(&bat_priv->tt.last_changeset_lock); 1042 kfree(bat_priv->tt.last_changeset); 1043 bat_priv->tt.last_changeset_len = 0; 1044 bat_priv->tt.last_changeset = NULL; 1045 tt_change_len = batadv_tt_len(tt_diff_entries_count); 1046 /* check whether this new OGM has no changes due to size problems */ 1047 if (tt_diff_entries_count > 0) { 1048 /* if kmalloc() fails we will reply with the full table 1049 * instead of providing the diff 1050 */ 1051 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC); 1052 if (bat_priv->tt.last_changeset) { 1053 memcpy(bat_priv->tt.last_changeset, 1054 tt_change, tt_change_len); 1055 bat_priv->tt.last_changeset_len = tt_diff_len; 1056 } 1057 } 1058 spin_unlock_bh(&bat_priv->tt.last_changeset_lock); 1059 1060 container_register: 1061 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data, 1062 tvlv_len); 1063 kfree(tt_data); 1064 } 1065 1066 /** 1067 * batadv_tt_local_dump_entry() - Dump one TT local entry into a message 1068 * @msg :Netlink message to dump into 1069 * @portid: Port making netlink request 1070 * @cb: Control block containing additional options 1071 * @bat_priv: The bat priv with all the soft interface information 1072 * @common: tt local & tt global common data 1073 * 1074 * Return: Error code, or 0 on success 1075 */ 1076 static int 1077 batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid, 1078 struct netlink_callback *cb, 1079 struct batadv_priv *bat_priv, 1080 struct batadv_tt_common_entry *common) 1081 { 1082 void *hdr; 1083 struct batadv_softif_vlan *vlan; 1084 struct batadv_tt_local_entry *local; 1085 unsigned int last_seen_msecs; 1086 u32 crc; 1087 1088 local = container_of(common, struct batadv_tt_local_entry, common); 1089 last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen); 1090 1091 vlan = batadv_softif_vlan_get(bat_priv, common->vid); 1092 if (!vlan) 1093 return 0; 1094 1095 crc = vlan->tt.crc; 1096 1097 batadv_softif_vlan_put(vlan); 1098 1099 hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, 1100 &batadv_netlink_family, NLM_F_MULTI, 1101 BATADV_CMD_GET_TRANSTABLE_LOCAL); 1102 if (!hdr) 1103 return -ENOBUFS; 1104 1105 genl_dump_check_consistent(cb, hdr); 1106 1107 if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) || 1108 nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) || 1109 nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) || 1110 nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags)) 1111 goto nla_put_failure; 1112 1113 if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) && 1114 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs)) 1115 goto nla_put_failure; 1116 1117 genlmsg_end(msg, hdr); 1118 return 0; 1119 1120 nla_put_failure: 1121 genlmsg_cancel(msg, hdr); 1122 return -EMSGSIZE; 1123 } 1124 1125 /** 1126 * batadv_tt_local_dump_bucket() - Dump one TT local bucket into a message 1127 * @msg: Netlink message to dump into 1128 * @portid: Port making netlink request 1129 * @cb: Control block containing additional options 1130 * @bat_priv: The bat priv with all the soft interface information 1131 * @hash: hash to dump 1132 * @bucket: bucket index to dump 1133 * @idx_s: Number of entries to skip 1134 * 1135 * Return: Error code, or 0 on success 1136 */ 1137 static int 1138 batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid, 1139 struct netlink_callback *cb, 1140 struct batadv_priv *bat_priv, 1141 struct batadv_hashtable *hash, unsigned int bucket, 1142 int *idx_s) 1143 { 1144 struct batadv_tt_common_entry *common; 1145 int idx = 0; 1146 1147 spin_lock_bh(&hash->list_locks[bucket]); 1148 cb->seq = atomic_read(&hash->generation) << 1 | 1; 1149 1150 hlist_for_each_entry(common, &hash->table[bucket], hash_entry) { 1151 if (idx++ < *idx_s) 1152 continue; 1153 1154 if (batadv_tt_local_dump_entry(msg, portid, cb, bat_priv, 1155 common)) { 1156 spin_unlock_bh(&hash->list_locks[bucket]); 1157 *idx_s = idx - 1; 1158 return -EMSGSIZE; 1159 } 1160 } 1161 spin_unlock_bh(&hash->list_locks[bucket]); 1162 1163 *idx_s = 0; 1164 return 0; 1165 } 1166 1167 /** 1168 * batadv_tt_local_dump() - Dump TT local entries into a message 1169 * @msg: Netlink message to dump into 1170 * @cb: Parameters from query 1171 * 1172 * Return: Error code, or 0 on success 1173 */ 1174 int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb) 1175 { 1176 struct net *net = sock_net(cb->skb->sk); 1177 struct net_device *soft_iface; 1178 struct batadv_priv *bat_priv; 1179 struct batadv_hard_iface *primary_if = NULL; 1180 struct batadv_hashtable *hash; 1181 int ret; 1182 int ifindex; 1183 int bucket = cb->args[0]; 1184 int idx = cb->args[1]; 1185 int portid = NETLINK_CB(cb->skb).portid; 1186 1187 ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); 1188 if (!ifindex) 1189 return -EINVAL; 1190 1191 soft_iface = dev_get_by_index(net, ifindex); 1192 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { 1193 ret = -ENODEV; 1194 goto out; 1195 } 1196 1197 bat_priv = netdev_priv(soft_iface); 1198 1199 primary_if = batadv_primary_if_get_selected(bat_priv); 1200 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { 1201 ret = -ENOENT; 1202 goto out; 1203 } 1204 1205 hash = bat_priv->tt.local_hash; 1206 1207 while (bucket < hash->size) { 1208 if (batadv_tt_local_dump_bucket(msg, portid, cb, bat_priv, 1209 hash, bucket, &idx)) 1210 break; 1211 1212 bucket++; 1213 } 1214 1215 ret = msg->len; 1216 1217 out: 1218 if (primary_if) 1219 batadv_hardif_put(primary_if); 1220 if (soft_iface) 1221 dev_put(soft_iface); 1222 1223 cb->args[0] = bucket; 1224 cb->args[1] = idx; 1225 1226 return ret; 1227 } 1228 1229 static void 1230 batadv_tt_local_set_pending(struct batadv_priv *bat_priv, 1231 struct batadv_tt_local_entry *tt_local_entry, 1232 u16 flags, const char *message) 1233 { 1234 batadv_tt_local_event(bat_priv, tt_local_entry, flags); 1235 1236 /* The local client has to be marked as "pending to be removed" but has 1237 * to be kept in the table in order to send it in a full table 1238 * response issued before the net ttvn increment (consistency check) 1239 */ 1240 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; 1241 1242 batadv_dbg(BATADV_DBG_TT, bat_priv, 1243 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n", 1244 tt_local_entry->common.addr, 1245 batadv_print_vid(tt_local_entry->common.vid), message); 1246 } 1247 1248 /** 1249 * batadv_tt_local_remove() - logically remove an entry from the local table 1250 * @bat_priv: the bat priv with all the soft interface information 1251 * @addr: the MAC address of the client to remove 1252 * @vid: VLAN identifier 1253 * @message: message to append to the log on deletion 1254 * @roaming: true if the deletion is due to a roaming event 1255 * 1256 * Return: the flags assigned to the local entry before being deleted 1257 */ 1258 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr, 1259 unsigned short vid, const char *message, 1260 bool roaming) 1261 { 1262 struct batadv_tt_local_entry *tt_removed_entry; 1263 struct batadv_tt_local_entry *tt_local_entry; 1264 u16 flags, curr_flags = BATADV_NO_FLAGS; 1265 struct hlist_node *tt_removed_node; 1266 1267 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid); 1268 if (!tt_local_entry) 1269 goto out; 1270 1271 curr_flags = tt_local_entry->common.flags; 1272 1273 flags = BATADV_TT_CLIENT_DEL; 1274 /* if this global entry addition is due to a roaming, the node has to 1275 * mark the local entry as "roamed" in order to correctly reroute 1276 * packets later 1277 */ 1278 if (roaming) { 1279 flags |= BATADV_TT_CLIENT_ROAM; 1280 /* mark the local client as ROAMed */ 1281 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM; 1282 } 1283 1284 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) { 1285 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, 1286 message); 1287 goto out; 1288 } 1289 /* if this client has been added right now, it is possible to 1290 * immediately purge it 1291 */ 1292 batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL); 1293 1294 tt_removed_node = batadv_hash_remove(bat_priv->tt.local_hash, 1295 batadv_compare_tt, 1296 batadv_choose_tt, 1297 &tt_local_entry->common); 1298 if (!tt_removed_node) 1299 goto out; 1300 1301 /* drop reference of remove hash entry */ 1302 tt_removed_entry = hlist_entry(tt_removed_node, 1303 struct batadv_tt_local_entry, 1304 common.hash_entry); 1305 batadv_tt_local_entry_put(tt_removed_entry); 1306 1307 out: 1308 if (tt_local_entry) 1309 batadv_tt_local_entry_put(tt_local_entry); 1310 1311 return curr_flags; 1312 } 1313 1314 /** 1315 * batadv_tt_local_purge_list() - purge inactive tt local entries 1316 * @bat_priv: the bat priv with all the soft interface information 1317 * @head: pointer to the list containing the local tt entries 1318 * @timeout: parameter deciding whether a given tt local entry is considered 1319 * inactive or not 1320 */ 1321 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, 1322 struct hlist_head *head, 1323 int timeout) 1324 { 1325 struct batadv_tt_local_entry *tt_local_entry; 1326 struct batadv_tt_common_entry *tt_common_entry; 1327 struct hlist_node *node_tmp; 1328 1329 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head, 1330 hash_entry) { 1331 tt_local_entry = container_of(tt_common_entry, 1332 struct batadv_tt_local_entry, 1333 common); 1334 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) 1335 continue; 1336 1337 /* entry already marked for deletion */ 1338 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) 1339 continue; 1340 1341 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout)) 1342 continue; 1343 1344 batadv_tt_local_set_pending(bat_priv, tt_local_entry, 1345 BATADV_TT_CLIENT_DEL, "timed out"); 1346 } 1347 } 1348 1349 /** 1350 * batadv_tt_local_purge() - purge inactive tt local entries 1351 * @bat_priv: the bat priv with all the soft interface information 1352 * @timeout: parameter deciding whether a given tt local entry is considered 1353 * inactive or not 1354 */ 1355 static void batadv_tt_local_purge(struct batadv_priv *bat_priv, 1356 int timeout) 1357 { 1358 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 1359 struct hlist_head *head; 1360 spinlock_t *list_lock; /* protects write access to the hash lists */ 1361 u32 i; 1362 1363 for (i = 0; i < hash->size; i++) { 1364 head = &hash->table[i]; 1365 list_lock = &hash->list_locks[i]; 1366 1367 spin_lock_bh(list_lock); 1368 batadv_tt_local_purge_list(bat_priv, head, timeout); 1369 spin_unlock_bh(list_lock); 1370 } 1371 } 1372 1373 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) 1374 { 1375 struct batadv_hashtable *hash; 1376 spinlock_t *list_lock; /* protects write access to the hash lists */ 1377 struct batadv_tt_common_entry *tt_common_entry; 1378 struct batadv_tt_local_entry *tt_local; 1379 struct hlist_node *node_tmp; 1380 struct hlist_head *head; 1381 u32 i; 1382 1383 if (!bat_priv->tt.local_hash) 1384 return; 1385 1386 hash = bat_priv->tt.local_hash; 1387 1388 for (i = 0; i < hash->size; i++) { 1389 head = &hash->table[i]; 1390 list_lock = &hash->list_locks[i]; 1391 1392 spin_lock_bh(list_lock); 1393 hlist_for_each_entry_safe(tt_common_entry, node_tmp, 1394 head, hash_entry) { 1395 hlist_del_rcu(&tt_common_entry->hash_entry); 1396 tt_local = container_of(tt_common_entry, 1397 struct batadv_tt_local_entry, 1398 common); 1399 1400 batadv_tt_local_entry_put(tt_local); 1401 } 1402 spin_unlock_bh(list_lock); 1403 } 1404 1405 batadv_hash_destroy(hash); 1406 1407 bat_priv->tt.local_hash = NULL; 1408 } 1409 1410 static int batadv_tt_global_init(struct batadv_priv *bat_priv) 1411 { 1412 if (bat_priv->tt.global_hash) 1413 return 0; 1414 1415 bat_priv->tt.global_hash = batadv_hash_new(1024); 1416 1417 if (!bat_priv->tt.global_hash) 1418 return -ENOMEM; 1419 1420 batadv_hash_set_lock_class(bat_priv->tt.global_hash, 1421 &batadv_tt_global_hash_lock_class_key); 1422 1423 return 0; 1424 } 1425 1426 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) 1427 { 1428 struct batadv_tt_change_node *entry, *safe; 1429 1430 spin_lock_bh(&bat_priv->tt.changes_list_lock); 1431 1432 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, 1433 list) { 1434 list_del(&entry->list); 1435 kmem_cache_free(batadv_tt_change_cache, entry); 1436 } 1437 1438 atomic_set(&bat_priv->tt.local_changes, 0); 1439 spin_unlock_bh(&bat_priv->tt.changes_list_lock); 1440 } 1441 1442 /** 1443 * batadv_tt_global_orig_entry_find() - find a TT orig_list_entry 1444 * @entry: the TT global entry where the orig_list_entry has to be 1445 * extracted from 1446 * @orig_node: the originator for which the orig_list_entry has to be found 1447 * 1448 * retrieve the orig_tt_list_entry belonging to orig_node from the 1449 * batadv_tt_global_entry list 1450 * 1451 * Return: it with an increased refcounter, NULL if not found 1452 */ 1453 static struct batadv_tt_orig_list_entry * 1454 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, 1455 const struct batadv_orig_node *orig_node) 1456 { 1457 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL; 1458 const struct hlist_head *head; 1459 1460 rcu_read_lock(); 1461 head = &entry->orig_list; 1462 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) { 1463 if (tmp_orig_entry->orig_node != orig_node) 1464 continue; 1465 if (!kref_get_unless_zero(&tmp_orig_entry->refcount)) 1466 continue; 1467 1468 orig_entry = tmp_orig_entry; 1469 break; 1470 } 1471 rcu_read_unlock(); 1472 1473 return orig_entry; 1474 } 1475 1476 /** 1477 * batadv_tt_global_entry_has_orig() - check if a TT global entry is also 1478 * handled by a given originator 1479 * @entry: the TT global entry to check 1480 * @orig_node: the originator to search in the list 1481 * @flags: a pointer to store TT flags for the given @entry received 1482 * from @orig_node 1483 * 1484 * find out if an orig_node is already in the list of a tt_global_entry. 1485 * 1486 * Return: true if found, false otherwise 1487 */ 1488 static bool 1489 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, 1490 const struct batadv_orig_node *orig_node, 1491 u8 *flags) 1492 { 1493 struct batadv_tt_orig_list_entry *orig_entry; 1494 bool found = false; 1495 1496 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node); 1497 if (orig_entry) { 1498 found = true; 1499 1500 if (flags) 1501 *flags = orig_entry->flags; 1502 1503 batadv_tt_orig_list_entry_put(orig_entry); 1504 } 1505 1506 return found; 1507 } 1508 1509 /** 1510 * batadv_tt_global_sync_flags() - update TT sync flags 1511 * @tt_global: the TT global entry to update sync flags in 1512 * 1513 * Updates the sync flag bits in the tt_global flag attribute with a logical 1514 * OR of all sync flags from any of its TT orig entries. 1515 */ 1516 static void 1517 batadv_tt_global_sync_flags(struct batadv_tt_global_entry *tt_global) 1518 { 1519 struct batadv_tt_orig_list_entry *orig_entry; 1520 const struct hlist_head *head; 1521 u16 flags = BATADV_NO_FLAGS; 1522 1523 rcu_read_lock(); 1524 head = &tt_global->orig_list; 1525 hlist_for_each_entry_rcu(orig_entry, head, list) 1526 flags |= orig_entry->flags; 1527 rcu_read_unlock(); 1528 1529 flags |= tt_global->common.flags & (~BATADV_TT_SYNC_MASK); 1530 tt_global->common.flags = flags; 1531 } 1532 1533 /** 1534 * batadv_tt_global_orig_entry_add() - add or update a TT orig entry 1535 * @tt_global: the TT global entry to add an orig entry in 1536 * @orig_node: the originator to add an orig entry for 1537 * @ttvn: translation table version number of this changeset 1538 * @flags: TT sync flags 1539 */ 1540 static void 1541 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, 1542 struct batadv_orig_node *orig_node, int ttvn, 1543 u8 flags) 1544 { 1545 struct batadv_tt_orig_list_entry *orig_entry; 1546 1547 spin_lock_bh(&tt_global->list_lock); 1548 1549 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node); 1550 if (orig_entry) { 1551 /* refresh the ttvn: the current value could be a bogus one that 1552 * was added during a "temporary client detection" 1553 */ 1554 orig_entry->ttvn = ttvn; 1555 orig_entry->flags = flags; 1556 goto sync_flags; 1557 } 1558 1559 orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC); 1560 if (!orig_entry) 1561 goto out; 1562 1563 INIT_HLIST_NODE(&orig_entry->list); 1564 kref_get(&orig_node->refcount); 1565 batadv_tt_global_size_inc(orig_node, tt_global->common.vid); 1566 orig_entry->orig_node = orig_node; 1567 orig_entry->ttvn = ttvn; 1568 orig_entry->flags = flags; 1569 kref_init(&orig_entry->refcount); 1570 1571 kref_get(&orig_entry->refcount); 1572 hlist_add_head_rcu(&orig_entry->list, 1573 &tt_global->orig_list); 1574 atomic_inc(&tt_global->orig_list_count); 1575 1576 sync_flags: 1577 batadv_tt_global_sync_flags(tt_global); 1578 out: 1579 if (orig_entry) 1580 batadv_tt_orig_list_entry_put(orig_entry); 1581 1582 spin_unlock_bh(&tt_global->list_lock); 1583 } 1584 1585 /** 1586 * batadv_tt_global_add() - add a new TT global entry or update an existing one 1587 * @bat_priv: the bat priv with all the soft interface information 1588 * @orig_node: the originator announcing the client 1589 * @tt_addr: the mac address of the non-mesh client 1590 * @vid: VLAN identifier 1591 * @flags: TT flags that have to be set for this non-mesh client 1592 * @ttvn: the tt version number ever announcing this non-mesh client 1593 * 1594 * Add a new TT global entry for the given originator. If the entry already 1595 * exists add a new reference to the given originator (a global entry can have 1596 * references to multiple originators) and adjust the flags attribute to reflect 1597 * the function argument. 1598 * If a TT local entry exists for this non-mesh client remove it. 1599 * 1600 * The caller must hold the orig_node refcount. 1601 * 1602 * Return: true if the new entry has been added, false otherwise 1603 */ 1604 static bool batadv_tt_global_add(struct batadv_priv *bat_priv, 1605 struct batadv_orig_node *orig_node, 1606 const unsigned char *tt_addr, 1607 unsigned short vid, u16 flags, u8 ttvn) 1608 { 1609 struct batadv_tt_global_entry *tt_global_entry; 1610 struct batadv_tt_local_entry *tt_local_entry; 1611 bool ret = false; 1612 int hash_added; 1613 struct batadv_tt_common_entry *common; 1614 u16 local_flags; 1615 1616 /* ignore global entries from backbone nodes */ 1617 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid)) 1618 return true; 1619 1620 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid); 1621 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid); 1622 1623 /* if the node already has a local client for this entry, it has to wait 1624 * for a roaming advertisement instead of manually messing up the global 1625 * table 1626 */ 1627 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry && 1628 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) 1629 goto out; 1630 1631 if (!tt_global_entry) { 1632 tt_global_entry = kmem_cache_zalloc(batadv_tg_cache, 1633 GFP_ATOMIC); 1634 if (!tt_global_entry) 1635 goto out; 1636 1637 common = &tt_global_entry->common; 1638 ether_addr_copy(common->addr, tt_addr); 1639 common->vid = vid; 1640 1641 if (!is_multicast_ether_addr(common->addr)) 1642 common->flags = flags & (~BATADV_TT_SYNC_MASK); 1643 1644 tt_global_entry->roam_at = 0; 1645 /* node must store current time in case of roaming. This is 1646 * needed to purge this entry out on timeout (if nobody claims 1647 * it) 1648 */ 1649 if (flags & BATADV_TT_CLIENT_ROAM) 1650 tt_global_entry->roam_at = jiffies; 1651 kref_init(&common->refcount); 1652 common->added_at = jiffies; 1653 1654 INIT_HLIST_HEAD(&tt_global_entry->orig_list); 1655 atomic_set(&tt_global_entry->orig_list_count, 0); 1656 spin_lock_init(&tt_global_entry->list_lock); 1657 1658 kref_get(&common->refcount); 1659 hash_added = batadv_hash_add(bat_priv->tt.global_hash, 1660 batadv_compare_tt, 1661 batadv_choose_tt, common, 1662 &common->hash_entry); 1663 1664 if (unlikely(hash_added != 0)) { 1665 /* remove the reference for the hash */ 1666 batadv_tt_global_entry_put(tt_global_entry); 1667 goto out_remove; 1668 } 1669 } else { 1670 common = &tt_global_entry->common; 1671 /* If there is already a global entry, we can use this one for 1672 * our processing. 1673 * But if we are trying to add a temporary client then here are 1674 * two options at this point: 1675 * 1) the global client is not a temporary client: the global 1676 * client has to be left as it is, temporary information 1677 * should never override any already known client state 1678 * 2) the global client is a temporary client: purge the 1679 * originator list and add the new one orig_entry 1680 */ 1681 if (flags & BATADV_TT_CLIENT_TEMP) { 1682 if (!(common->flags & BATADV_TT_CLIENT_TEMP)) 1683 goto out; 1684 if (batadv_tt_global_entry_has_orig(tt_global_entry, 1685 orig_node, NULL)) 1686 goto out_remove; 1687 batadv_tt_global_del_orig_list(tt_global_entry); 1688 goto add_orig_entry; 1689 } 1690 1691 /* if the client was temporary added before receiving the first 1692 * OGM announcing it, we have to clear the TEMP flag. Also, 1693 * remove the previous temporary orig node and re-add it 1694 * if required. If the orig entry changed, the new one which 1695 * is a non-temporary entry is preferred. 1696 */ 1697 if (common->flags & BATADV_TT_CLIENT_TEMP) { 1698 batadv_tt_global_del_orig_list(tt_global_entry); 1699 common->flags &= ~BATADV_TT_CLIENT_TEMP; 1700 } 1701 1702 /* the change can carry possible "attribute" flags like the 1703 * TT_CLIENT_TEMP, therefore they have to be copied in the 1704 * client entry 1705 */ 1706 if (!is_multicast_ether_addr(common->addr)) 1707 common->flags |= flags & (~BATADV_TT_SYNC_MASK); 1708 1709 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only 1710 * one originator left in the list and we previously received a 1711 * delete + roaming change for this originator. 1712 * 1713 * We should first delete the old originator before adding the 1714 * new one. 1715 */ 1716 if (common->flags & BATADV_TT_CLIENT_ROAM) { 1717 batadv_tt_global_del_orig_list(tt_global_entry); 1718 common->flags &= ~BATADV_TT_CLIENT_ROAM; 1719 tt_global_entry->roam_at = 0; 1720 } 1721 } 1722 add_orig_entry: 1723 /* add the new orig_entry (if needed) or update it */ 1724 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn, 1725 flags & BATADV_TT_SYNC_MASK); 1726 1727 batadv_dbg(BATADV_DBG_TT, bat_priv, 1728 "Creating new global tt entry: %pM (vid: %d, via %pM)\n", 1729 common->addr, batadv_print_vid(common->vid), 1730 orig_node->orig); 1731 ret = true; 1732 1733 out_remove: 1734 /* Do not remove multicast addresses from the local hash on 1735 * global additions 1736 */ 1737 if (is_multicast_ether_addr(tt_addr)) 1738 goto out; 1739 1740 /* remove address from local hash if present */ 1741 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid, 1742 "global tt received", 1743 flags & BATADV_TT_CLIENT_ROAM); 1744 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI; 1745 1746 if (!(flags & BATADV_TT_CLIENT_ROAM)) 1747 /* this is a normal global add. Therefore the client is not in a 1748 * roaming state anymore. 1749 */ 1750 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; 1751 1752 out: 1753 if (tt_global_entry) 1754 batadv_tt_global_entry_put(tt_global_entry); 1755 if (tt_local_entry) 1756 batadv_tt_local_entry_put(tt_local_entry); 1757 return ret; 1758 } 1759 1760 /** 1761 * batadv_transtable_best_orig() - Get best originator list entry from tt entry 1762 * @bat_priv: the bat priv with all the soft interface information 1763 * @tt_global_entry: global translation table entry to be analyzed 1764 * 1765 * This function assumes the caller holds rcu_read_lock(). 1766 * Return: best originator list entry or NULL on errors. 1767 */ 1768 static struct batadv_tt_orig_list_entry * 1769 batadv_transtable_best_orig(struct batadv_priv *bat_priv, 1770 struct batadv_tt_global_entry *tt_global_entry) 1771 { 1772 struct batadv_neigh_node *router, *best_router = NULL; 1773 struct batadv_algo_ops *bao = bat_priv->algo_ops; 1774 struct hlist_head *head; 1775 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL; 1776 1777 head = &tt_global_entry->orig_list; 1778 hlist_for_each_entry_rcu(orig_entry, head, list) { 1779 router = batadv_orig_router_get(orig_entry->orig_node, 1780 BATADV_IF_DEFAULT); 1781 if (!router) 1782 continue; 1783 1784 if (best_router && 1785 bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router, 1786 BATADV_IF_DEFAULT) <= 0) { 1787 batadv_neigh_node_put(router); 1788 continue; 1789 } 1790 1791 /* release the refcount for the "old" best */ 1792 if (best_router) 1793 batadv_neigh_node_put(best_router); 1794 1795 best_entry = orig_entry; 1796 best_router = router; 1797 } 1798 1799 if (best_router) 1800 batadv_neigh_node_put(best_router); 1801 1802 return best_entry; 1803 } 1804 1805 /** 1806 * batadv_tt_global_dump_subentry() - Dump all TT local entries into a message 1807 * @msg: Netlink message to dump into 1808 * @portid: Port making netlink request 1809 * @seq: Sequence number of netlink message 1810 * @common: tt local & tt global common data 1811 * @orig: Originator node announcing a non-mesh client 1812 * @best: Is the best originator for the TT entry 1813 * 1814 * Return: Error code, or 0 on success 1815 */ 1816 static int 1817 batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq, 1818 struct batadv_tt_common_entry *common, 1819 struct batadv_tt_orig_list_entry *orig, 1820 bool best) 1821 { 1822 u16 flags = (common->flags & (~BATADV_TT_SYNC_MASK)) | orig->flags; 1823 void *hdr; 1824 struct batadv_orig_node_vlan *vlan; 1825 u8 last_ttvn; 1826 u32 crc; 1827 1828 vlan = batadv_orig_node_vlan_get(orig->orig_node, 1829 common->vid); 1830 if (!vlan) 1831 return 0; 1832 1833 crc = vlan->tt.crc; 1834 1835 batadv_orig_node_vlan_put(vlan); 1836 1837 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, 1838 NLM_F_MULTI, 1839 BATADV_CMD_GET_TRANSTABLE_GLOBAL); 1840 if (!hdr) 1841 return -ENOBUFS; 1842 1843 last_ttvn = atomic_read(&orig->orig_node->last_ttvn); 1844 1845 if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) || 1846 nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, 1847 orig->orig_node->orig) || 1848 nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) || 1849 nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) || 1850 nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) || 1851 nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) || 1852 nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, flags)) 1853 goto nla_put_failure; 1854 1855 if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) 1856 goto nla_put_failure; 1857 1858 genlmsg_end(msg, hdr); 1859 return 0; 1860 1861 nla_put_failure: 1862 genlmsg_cancel(msg, hdr); 1863 return -EMSGSIZE; 1864 } 1865 1866 /** 1867 * batadv_tt_global_dump_entry() - Dump one TT global entry into a message 1868 * @msg: Netlink message to dump into 1869 * @portid: Port making netlink request 1870 * @seq: Sequence number of netlink message 1871 * @bat_priv: The bat priv with all the soft interface information 1872 * @common: tt local & tt global common data 1873 * @sub_s: Number of entries to skip 1874 * 1875 * This function assumes the caller holds rcu_read_lock(). 1876 * 1877 * Return: Error code, or 0 on success 1878 */ 1879 static int 1880 batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, 1881 struct batadv_priv *bat_priv, 1882 struct batadv_tt_common_entry *common, int *sub_s) 1883 { 1884 struct batadv_tt_orig_list_entry *orig_entry, *best_entry; 1885 struct batadv_tt_global_entry *global; 1886 struct hlist_head *head; 1887 int sub = 0; 1888 bool best; 1889 1890 global = container_of(common, struct batadv_tt_global_entry, common); 1891 best_entry = batadv_transtable_best_orig(bat_priv, global); 1892 head = &global->orig_list; 1893 1894 hlist_for_each_entry_rcu(orig_entry, head, list) { 1895 if (sub++ < *sub_s) 1896 continue; 1897 1898 best = (orig_entry == best_entry); 1899 1900 if (batadv_tt_global_dump_subentry(msg, portid, seq, common, 1901 orig_entry, best)) { 1902 *sub_s = sub - 1; 1903 return -EMSGSIZE; 1904 } 1905 } 1906 1907 *sub_s = 0; 1908 return 0; 1909 } 1910 1911 /** 1912 * batadv_tt_global_dump_bucket() - Dump one TT local bucket into a message 1913 * @msg: Netlink message to dump into 1914 * @portid: Port making netlink request 1915 * @seq: Sequence number of netlink message 1916 * @bat_priv: The bat priv with all the soft interface information 1917 * @head: Pointer to the list containing the global tt entries 1918 * @idx_s: Number of entries to skip 1919 * @sub: Number of entries to skip 1920 * 1921 * Return: Error code, or 0 on success 1922 */ 1923 static int 1924 batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, 1925 struct batadv_priv *bat_priv, 1926 struct hlist_head *head, int *idx_s, int *sub) 1927 { 1928 struct batadv_tt_common_entry *common; 1929 int idx = 0; 1930 1931 rcu_read_lock(); 1932 hlist_for_each_entry_rcu(common, head, hash_entry) { 1933 if (idx++ < *idx_s) 1934 continue; 1935 1936 if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv, 1937 common, sub)) { 1938 rcu_read_unlock(); 1939 *idx_s = idx - 1; 1940 return -EMSGSIZE; 1941 } 1942 } 1943 rcu_read_unlock(); 1944 1945 *idx_s = 0; 1946 *sub = 0; 1947 return 0; 1948 } 1949 1950 /** 1951 * batadv_tt_global_dump() - Dump TT global entries into a message 1952 * @msg: Netlink message to dump into 1953 * @cb: Parameters from query 1954 * 1955 * Return: Error code, or length of message on success 1956 */ 1957 int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb) 1958 { 1959 struct net *net = sock_net(cb->skb->sk); 1960 struct net_device *soft_iface; 1961 struct batadv_priv *bat_priv; 1962 struct batadv_hard_iface *primary_if = NULL; 1963 struct batadv_hashtable *hash; 1964 struct hlist_head *head; 1965 int ret; 1966 int ifindex; 1967 int bucket = cb->args[0]; 1968 int idx = cb->args[1]; 1969 int sub = cb->args[2]; 1970 int portid = NETLINK_CB(cb->skb).portid; 1971 1972 ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); 1973 if (!ifindex) 1974 return -EINVAL; 1975 1976 soft_iface = dev_get_by_index(net, ifindex); 1977 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { 1978 ret = -ENODEV; 1979 goto out; 1980 } 1981 1982 bat_priv = netdev_priv(soft_iface); 1983 1984 primary_if = batadv_primary_if_get_selected(bat_priv); 1985 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { 1986 ret = -ENOENT; 1987 goto out; 1988 } 1989 1990 hash = bat_priv->tt.global_hash; 1991 1992 while (bucket < hash->size) { 1993 head = &hash->table[bucket]; 1994 1995 if (batadv_tt_global_dump_bucket(msg, portid, 1996 cb->nlh->nlmsg_seq, bat_priv, 1997 head, &idx, &sub)) 1998 break; 1999 2000 bucket++; 2001 } 2002 2003 ret = msg->len; 2004 2005 out: 2006 if (primary_if) 2007 batadv_hardif_put(primary_if); 2008 if (soft_iface) 2009 dev_put(soft_iface); 2010 2011 cb->args[0] = bucket; 2012 cb->args[1] = idx; 2013 cb->args[2] = sub; 2014 2015 return ret; 2016 } 2017 2018 /** 2019 * _batadv_tt_global_del_orig_entry() - remove and free an orig_entry 2020 * @tt_global_entry: the global entry to remove the orig_entry from 2021 * @orig_entry: the orig entry to remove and free 2022 * 2023 * Remove an orig_entry from its list in the given tt_global_entry and 2024 * free this orig_entry afterwards. 2025 * 2026 * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is 2027 * part of a list. 2028 */ 2029 static void 2030 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry, 2031 struct batadv_tt_orig_list_entry *orig_entry) 2032 { 2033 lockdep_assert_held(&tt_global_entry->list_lock); 2034 2035 batadv_tt_global_size_dec(orig_entry->orig_node, 2036 tt_global_entry->common.vid); 2037 atomic_dec(&tt_global_entry->orig_list_count); 2038 /* requires holding tt_global_entry->list_lock and orig_entry->list 2039 * being part of a list 2040 */ 2041 hlist_del_rcu(&orig_entry->list); 2042 batadv_tt_orig_list_entry_put(orig_entry); 2043 } 2044 2045 /* deletes the orig list of a tt_global_entry */ 2046 static void 2047 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) 2048 { 2049 struct hlist_head *head; 2050 struct hlist_node *safe; 2051 struct batadv_tt_orig_list_entry *orig_entry; 2052 2053 spin_lock_bh(&tt_global_entry->list_lock); 2054 head = &tt_global_entry->orig_list; 2055 hlist_for_each_entry_safe(orig_entry, safe, head, list) 2056 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry); 2057 spin_unlock_bh(&tt_global_entry->list_lock); 2058 } 2059 2060 /** 2061 * batadv_tt_global_del_orig_node() - remove orig_node from a global tt entry 2062 * @bat_priv: the bat priv with all the soft interface information 2063 * @tt_global_entry: the global entry to remove the orig_node from 2064 * @orig_node: the originator announcing the client 2065 * @message: message to append to the log on deletion 2066 * 2067 * Remove the given orig_node and its according orig_entry from the given 2068 * global tt entry. 2069 */ 2070 static void 2071 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv, 2072 struct batadv_tt_global_entry *tt_global_entry, 2073 struct batadv_orig_node *orig_node, 2074 const char *message) 2075 { 2076 struct hlist_head *head; 2077 struct hlist_node *safe; 2078 struct batadv_tt_orig_list_entry *orig_entry; 2079 unsigned short vid; 2080 2081 spin_lock_bh(&tt_global_entry->list_lock); 2082 head = &tt_global_entry->orig_list; 2083 hlist_for_each_entry_safe(orig_entry, safe, head, list) { 2084 if (orig_entry->orig_node == orig_node) { 2085 vid = tt_global_entry->common.vid; 2086 batadv_dbg(BATADV_DBG_TT, bat_priv, 2087 "Deleting %pM from global tt entry %pM (vid: %d): %s\n", 2088 orig_node->orig, 2089 tt_global_entry->common.addr, 2090 batadv_print_vid(vid), message); 2091 _batadv_tt_global_del_orig_entry(tt_global_entry, 2092 orig_entry); 2093 } 2094 } 2095 spin_unlock_bh(&tt_global_entry->list_lock); 2096 } 2097 2098 /* If the client is to be deleted, we check if it is the last origantor entry 2099 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the 2100 * timer, otherwise we simply remove the originator scheduled for deletion. 2101 */ 2102 static void 2103 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, 2104 struct batadv_tt_global_entry *tt_global_entry, 2105 struct batadv_orig_node *orig_node, 2106 const char *message) 2107 { 2108 bool last_entry = true; 2109 struct hlist_head *head; 2110 struct batadv_tt_orig_list_entry *orig_entry; 2111 2112 /* no local entry exists, case 1: 2113 * Check if this is the last one or if other entries exist. 2114 */ 2115 2116 rcu_read_lock(); 2117 head = &tt_global_entry->orig_list; 2118 hlist_for_each_entry_rcu(orig_entry, head, list) { 2119 if (orig_entry->orig_node != orig_node) { 2120 last_entry = false; 2121 break; 2122 } 2123 } 2124 rcu_read_unlock(); 2125 2126 if (last_entry) { 2127 /* its the last one, mark for roaming. */ 2128 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; 2129 tt_global_entry->roam_at = jiffies; 2130 } else { 2131 /* there is another entry, we can simply delete this 2132 * one and can still use the other one. 2133 */ 2134 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry, 2135 orig_node, message); 2136 } 2137 } 2138 2139 /** 2140 * batadv_tt_global_del() - remove a client from the global table 2141 * @bat_priv: the bat priv with all the soft interface information 2142 * @orig_node: an originator serving this client 2143 * @addr: the mac address of the client 2144 * @vid: VLAN identifier 2145 * @message: a message explaining the reason for deleting the client to print 2146 * for debugging purpose 2147 * @roaming: true if the deletion has been triggered by a roaming event 2148 */ 2149 static void batadv_tt_global_del(struct batadv_priv *bat_priv, 2150 struct batadv_orig_node *orig_node, 2151 const unsigned char *addr, unsigned short vid, 2152 const char *message, bool roaming) 2153 { 2154 struct batadv_tt_global_entry *tt_global_entry; 2155 struct batadv_tt_local_entry *local_entry = NULL; 2156 2157 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid); 2158 if (!tt_global_entry) 2159 goto out; 2160 2161 if (!roaming) { 2162 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry, 2163 orig_node, message); 2164 2165 if (hlist_empty(&tt_global_entry->orig_list)) 2166 batadv_tt_global_free(bat_priv, tt_global_entry, 2167 message); 2168 2169 goto out; 2170 } 2171 2172 /* if we are deleting a global entry due to a roam 2173 * event, there are two possibilities: 2174 * 1) the client roamed from node A to node B => if there 2175 * is only one originator left for this client, we mark 2176 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we 2177 * wait for node B to claim it. In case of timeout 2178 * the entry is purged. 2179 * 2180 * If there are other originators left, we directly delete 2181 * the originator. 2182 * 2) the client roamed to us => we can directly delete 2183 * the global entry, since it is useless now. 2184 */ 2185 local_entry = batadv_tt_local_hash_find(bat_priv, 2186 tt_global_entry->common.addr, 2187 vid); 2188 if (local_entry) { 2189 /* local entry exists, case 2: client roamed to us. */ 2190 batadv_tt_global_del_orig_list(tt_global_entry); 2191 batadv_tt_global_free(bat_priv, tt_global_entry, message); 2192 } else { 2193 /* no local entry exists, case 1: check for roaming */ 2194 batadv_tt_global_del_roaming(bat_priv, tt_global_entry, 2195 orig_node, message); 2196 } 2197 2198 out: 2199 if (tt_global_entry) 2200 batadv_tt_global_entry_put(tt_global_entry); 2201 if (local_entry) 2202 batadv_tt_local_entry_put(local_entry); 2203 } 2204 2205 /** 2206 * batadv_tt_global_del_orig() - remove all the TT global entries belonging to 2207 * the given originator matching the provided vid 2208 * @bat_priv: the bat priv with all the soft interface information 2209 * @orig_node: the originator owning the entries to remove 2210 * @match_vid: the VLAN identifier to match. If negative all the entries will be 2211 * removed 2212 * @message: debug message to print as "reason" 2213 */ 2214 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, 2215 struct batadv_orig_node *orig_node, 2216 s32 match_vid, 2217 const char *message) 2218 { 2219 struct batadv_tt_global_entry *tt_global; 2220 struct batadv_tt_common_entry *tt_common_entry; 2221 u32 i; 2222 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 2223 struct hlist_node *safe; 2224 struct hlist_head *head; 2225 spinlock_t *list_lock; /* protects write access to the hash lists */ 2226 unsigned short vid; 2227 2228 if (!hash) 2229 return; 2230 2231 for (i = 0; i < hash->size; i++) { 2232 head = &hash->table[i]; 2233 list_lock = &hash->list_locks[i]; 2234 2235 spin_lock_bh(list_lock); 2236 hlist_for_each_entry_safe(tt_common_entry, safe, 2237 head, hash_entry) { 2238 /* remove only matching entries */ 2239 if (match_vid >= 0 && tt_common_entry->vid != match_vid) 2240 continue; 2241 2242 tt_global = container_of(tt_common_entry, 2243 struct batadv_tt_global_entry, 2244 common); 2245 2246 batadv_tt_global_del_orig_node(bat_priv, tt_global, 2247 orig_node, message); 2248 2249 if (hlist_empty(&tt_global->orig_list)) { 2250 vid = tt_global->common.vid; 2251 batadv_dbg(BATADV_DBG_TT, bat_priv, 2252 "Deleting global tt entry %pM (vid: %d): %s\n", 2253 tt_global->common.addr, 2254 batadv_print_vid(vid), message); 2255 hlist_del_rcu(&tt_common_entry->hash_entry); 2256 batadv_tt_global_entry_put(tt_global); 2257 } 2258 } 2259 spin_unlock_bh(list_lock); 2260 } 2261 clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized); 2262 } 2263 2264 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global, 2265 char **msg) 2266 { 2267 bool purge = false; 2268 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT; 2269 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT; 2270 2271 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) && 2272 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) { 2273 purge = true; 2274 *msg = "Roaming timeout\n"; 2275 } 2276 2277 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) && 2278 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) { 2279 purge = true; 2280 *msg = "Temporary client timeout\n"; 2281 } 2282 2283 return purge; 2284 } 2285 2286 static void batadv_tt_global_purge(struct batadv_priv *bat_priv) 2287 { 2288 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 2289 struct hlist_head *head; 2290 struct hlist_node *node_tmp; 2291 spinlock_t *list_lock; /* protects write access to the hash lists */ 2292 u32 i; 2293 char *msg = NULL; 2294 struct batadv_tt_common_entry *tt_common; 2295 struct batadv_tt_global_entry *tt_global; 2296 2297 for (i = 0; i < hash->size; i++) { 2298 head = &hash->table[i]; 2299 list_lock = &hash->list_locks[i]; 2300 2301 spin_lock_bh(list_lock); 2302 hlist_for_each_entry_safe(tt_common, node_tmp, head, 2303 hash_entry) { 2304 tt_global = container_of(tt_common, 2305 struct batadv_tt_global_entry, 2306 common); 2307 2308 if (!batadv_tt_global_to_purge(tt_global, &msg)) 2309 continue; 2310 2311 batadv_dbg(BATADV_DBG_TT, bat_priv, 2312 "Deleting global tt entry %pM (vid: %d): %s\n", 2313 tt_global->common.addr, 2314 batadv_print_vid(tt_global->common.vid), 2315 msg); 2316 2317 hlist_del_rcu(&tt_common->hash_entry); 2318 2319 batadv_tt_global_entry_put(tt_global); 2320 } 2321 spin_unlock_bh(list_lock); 2322 } 2323 } 2324 2325 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) 2326 { 2327 struct batadv_hashtable *hash; 2328 spinlock_t *list_lock; /* protects write access to the hash lists */ 2329 struct batadv_tt_common_entry *tt_common_entry; 2330 struct batadv_tt_global_entry *tt_global; 2331 struct hlist_node *node_tmp; 2332 struct hlist_head *head; 2333 u32 i; 2334 2335 if (!bat_priv->tt.global_hash) 2336 return; 2337 2338 hash = bat_priv->tt.global_hash; 2339 2340 for (i = 0; i < hash->size; i++) { 2341 head = &hash->table[i]; 2342 list_lock = &hash->list_locks[i]; 2343 2344 spin_lock_bh(list_lock); 2345 hlist_for_each_entry_safe(tt_common_entry, node_tmp, 2346 head, hash_entry) { 2347 hlist_del_rcu(&tt_common_entry->hash_entry); 2348 tt_global = container_of(tt_common_entry, 2349 struct batadv_tt_global_entry, 2350 common); 2351 batadv_tt_global_entry_put(tt_global); 2352 } 2353 spin_unlock_bh(list_lock); 2354 } 2355 2356 batadv_hash_destroy(hash); 2357 2358 bat_priv->tt.global_hash = NULL; 2359 } 2360 2361 static bool 2362 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, 2363 struct batadv_tt_global_entry *tt_global_entry) 2364 { 2365 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && 2366 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) 2367 return true; 2368 2369 /* check if the two clients are marked as isolated */ 2370 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA && 2371 tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA) 2372 return true; 2373 2374 return false; 2375 } 2376 2377 /** 2378 * batadv_transtable_search() - get the mesh destination for a given client 2379 * @bat_priv: the bat priv with all the soft interface information 2380 * @src: mac address of the source client 2381 * @addr: mac address of the destination client 2382 * @vid: VLAN identifier 2383 * 2384 * Return: a pointer to the originator that was selected as destination in the 2385 * mesh for contacting the client 'addr', NULL otherwise. 2386 * In case of multiple originators serving the same client, the function returns 2387 * the best one (best in terms of metric towards the destination node). 2388 * 2389 * If the two clients are AP isolated the function returns NULL. 2390 */ 2391 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, 2392 const u8 *src, 2393 const u8 *addr, 2394 unsigned short vid) 2395 { 2396 struct batadv_tt_local_entry *tt_local_entry = NULL; 2397 struct batadv_tt_global_entry *tt_global_entry = NULL; 2398 struct batadv_orig_node *orig_node = NULL; 2399 struct batadv_tt_orig_list_entry *best_entry; 2400 2401 if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) { 2402 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid); 2403 if (!tt_local_entry || 2404 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)) 2405 goto out; 2406 } 2407 2408 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid); 2409 if (!tt_global_entry) 2410 goto out; 2411 2412 /* check whether the clients should not communicate due to AP 2413 * isolation 2414 */ 2415 if (tt_local_entry && 2416 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) 2417 goto out; 2418 2419 rcu_read_lock(); 2420 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry); 2421 /* found anything? */ 2422 if (best_entry) 2423 orig_node = best_entry->orig_node; 2424 if (orig_node && !kref_get_unless_zero(&orig_node->refcount)) 2425 orig_node = NULL; 2426 rcu_read_unlock(); 2427 2428 out: 2429 if (tt_global_entry) 2430 batadv_tt_global_entry_put(tt_global_entry); 2431 if (tt_local_entry) 2432 batadv_tt_local_entry_put(tt_local_entry); 2433 2434 return orig_node; 2435 } 2436 2437 /** 2438 * batadv_tt_global_crc() - calculates the checksum of the local table belonging 2439 * to the given orig_node 2440 * @bat_priv: the bat priv with all the soft interface information 2441 * @orig_node: originator for which the CRC should be computed 2442 * @vid: VLAN identifier for which the CRC32 has to be computed 2443 * 2444 * This function computes the checksum for the global table corresponding to a 2445 * specific originator. In particular, the checksum is computed as follows: For 2446 * each client connected to the originator the CRC32C of the MAC address and the 2447 * VID is computed and then all the CRC32Cs of the various clients are xor'ed 2448 * together. 2449 * 2450 * The idea behind is that CRC32C should be used as much as possible in order to 2451 * produce a unique hash of the table, but since the order which is used to feed 2452 * the CRC32C function affects the result and since every node in the network 2453 * probably sorts the clients differently, the hash function cannot be directly 2454 * computed over the entire table. Hence the CRC32C is used only on 2455 * the single client entry, while all the results are then xor'ed together 2456 * because the XOR operation can combine them all while trying to reduce the 2457 * noise as much as possible. 2458 * 2459 * Return: the checksum of the global table of a given originator. 2460 */ 2461 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv, 2462 struct batadv_orig_node *orig_node, 2463 unsigned short vid) 2464 { 2465 struct batadv_hashtable *hash = bat_priv->tt.global_hash; 2466 struct batadv_tt_orig_list_entry *tt_orig; 2467 struct batadv_tt_common_entry *tt_common; 2468 struct batadv_tt_global_entry *tt_global; 2469 struct hlist_head *head; 2470 u32 i, crc_tmp, crc = 0; 2471 u8 flags; 2472 __be16 tmp_vid; 2473 2474 for (i = 0; i < hash->size; i++) { 2475 head = &hash->table[i]; 2476 2477 rcu_read_lock(); 2478 hlist_for_each_entry_rcu(tt_common, head, hash_entry) { 2479 tt_global = container_of(tt_common, 2480 struct batadv_tt_global_entry, 2481 common); 2482 /* compute the CRC only for entries belonging to the 2483 * VLAN identified by the vid passed as parameter 2484 */ 2485 if (tt_common->vid != vid) 2486 continue; 2487 2488 /* Roaming clients are in the global table for 2489 * consistency only. They don't have to be 2490 * taken into account while computing the 2491 * global crc 2492 */ 2493 if (tt_common->flags & BATADV_TT_CLIENT_ROAM) 2494 continue; 2495 /* Temporary clients have not been announced yet, so 2496 * they have to be skipped while computing the global 2497 * crc 2498 */ 2499 if (tt_common->flags & BATADV_TT_CLIENT_TEMP) 2500 continue; 2501 2502 /* find out if this global entry is announced by this 2503 * originator 2504 */ 2505 tt_orig = batadv_tt_global_orig_entry_find(tt_global, 2506 orig_node); 2507 if (!tt_orig) 2508 continue; 2509 2510 /* use network order to read the VID: this ensures that 2511 * every node reads the bytes in the same order. 2512 */ 2513 tmp_vid = htons(tt_common->vid); 2514 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid)); 2515 2516 /* compute the CRC on flags that have to be kept in sync 2517 * among nodes 2518 */ 2519 flags = tt_orig->flags; 2520 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags)); 2521 2522 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN); 2523 2524 batadv_tt_orig_list_entry_put(tt_orig); 2525 } 2526 rcu_read_unlock(); 2527 } 2528 2529 return crc; 2530 } 2531 2532 /** 2533 * batadv_tt_local_crc() - calculates the checksum of the local table 2534 * @bat_priv: the bat priv with all the soft interface information 2535 * @vid: VLAN identifier for which the CRC32 has to be computed 2536 * 2537 * For details about the computation, please refer to the documentation for 2538 * batadv_tt_global_crc(). 2539 * 2540 * Return: the checksum of the local table 2541 */ 2542 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv, 2543 unsigned short vid) 2544 { 2545 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 2546 struct batadv_tt_common_entry *tt_common; 2547 struct hlist_head *head; 2548 u32 i, crc_tmp, crc = 0; 2549 u8 flags; 2550 __be16 tmp_vid; 2551 2552 for (i = 0; i < hash->size; i++) { 2553 head = &hash->table[i]; 2554 2555 rcu_read_lock(); 2556 hlist_for_each_entry_rcu(tt_common, head, hash_entry) { 2557 /* compute the CRC only for entries belonging to the 2558 * VLAN identified by vid 2559 */ 2560 if (tt_common->vid != vid) 2561 continue; 2562 2563 /* not yet committed clients have not to be taken into 2564 * account while computing the CRC 2565 */ 2566 if (tt_common->flags & BATADV_TT_CLIENT_NEW) 2567 continue; 2568 2569 /* use network order to read the VID: this ensures that 2570 * every node reads the bytes in the same order. 2571 */ 2572 tmp_vid = htons(tt_common->vid); 2573 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid)); 2574 2575 /* compute the CRC on flags that have to be kept in sync 2576 * among nodes 2577 */ 2578 flags = tt_common->flags & BATADV_TT_SYNC_MASK; 2579 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags)); 2580 2581 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN); 2582 } 2583 rcu_read_unlock(); 2584 } 2585 2586 return crc; 2587 } 2588 2589 /** 2590 * batadv_tt_req_node_release() - free tt_req node entry 2591 * @ref: kref pointer of the tt req_node entry 2592 */ 2593 static void batadv_tt_req_node_release(struct kref *ref) 2594 { 2595 struct batadv_tt_req_node *tt_req_node; 2596 2597 tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount); 2598 2599 kmem_cache_free(batadv_tt_req_cache, tt_req_node); 2600 } 2601 2602 /** 2603 * batadv_tt_req_node_put() - decrement the tt_req_node refcounter and 2604 * possibly release it 2605 * @tt_req_node: tt_req_node to be free'd 2606 */ 2607 static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node) 2608 { 2609 kref_put(&tt_req_node->refcount, batadv_tt_req_node_release); 2610 } 2611 2612 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) 2613 { 2614 struct batadv_tt_req_node *node; 2615 struct hlist_node *safe; 2616 2617 spin_lock_bh(&bat_priv->tt.req_list_lock); 2618 2619 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { 2620 hlist_del_init(&node->list); 2621 batadv_tt_req_node_put(node); 2622 } 2623 2624 spin_unlock_bh(&bat_priv->tt.req_list_lock); 2625 } 2626 2627 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, 2628 struct batadv_orig_node *orig_node, 2629 const void *tt_buff, 2630 u16 tt_buff_len) 2631 { 2632 /* Replace the old buffer only if I received something in the 2633 * last OGM (the OGM could carry no changes) 2634 */ 2635 spin_lock_bh(&orig_node->tt_buff_lock); 2636 if (tt_buff_len > 0) { 2637 kfree(orig_node->tt_buff); 2638 orig_node->tt_buff_len = 0; 2639 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); 2640 if (orig_node->tt_buff) { 2641 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); 2642 orig_node->tt_buff_len = tt_buff_len; 2643 } 2644 } 2645 spin_unlock_bh(&orig_node->tt_buff_lock); 2646 } 2647 2648 static void batadv_tt_req_purge(struct batadv_priv *bat_priv) 2649 { 2650 struct batadv_tt_req_node *node; 2651 struct hlist_node *safe; 2652 2653 spin_lock_bh(&bat_priv->tt.req_list_lock); 2654 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { 2655 if (batadv_has_timed_out(node->issued_at, 2656 BATADV_TT_REQUEST_TIMEOUT)) { 2657 hlist_del_init(&node->list); 2658 batadv_tt_req_node_put(node); 2659 } 2660 } 2661 spin_unlock_bh(&bat_priv->tt.req_list_lock); 2662 } 2663 2664 /** 2665 * batadv_tt_req_node_new() - search and possibly create a tt_req_node object 2666 * @bat_priv: the bat priv with all the soft interface information 2667 * @orig_node: orig node this request is being issued for 2668 * 2669 * Return: the pointer to the new tt_req_node struct if no request 2670 * has already been issued for this orig_node, NULL otherwise. 2671 */ 2672 static struct batadv_tt_req_node * 2673 batadv_tt_req_node_new(struct batadv_priv *bat_priv, 2674 struct batadv_orig_node *orig_node) 2675 { 2676 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; 2677 2678 spin_lock_bh(&bat_priv->tt.req_list_lock); 2679 hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { 2680 if (batadv_compare_eth(tt_req_node_tmp, orig_node) && 2681 !batadv_has_timed_out(tt_req_node_tmp->issued_at, 2682 BATADV_TT_REQUEST_TIMEOUT)) 2683 goto unlock; 2684 } 2685 2686 tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC); 2687 if (!tt_req_node) 2688 goto unlock; 2689 2690 kref_init(&tt_req_node->refcount); 2691 ether_addr_copy(tt_req_node->addr, orig_node->orig); 2692 tt_req_node->issued_at = jiffies; 2693 2694 kref_get(&tt_req_node->refcount); 2695 hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list); 2696 unlock: 2697 spin_unlock_bh(&bat_priv->tt.req_list_lock); 2698 return tt_req_node; 2699 } 2700 2701 /** 2702 * batadv_tt_local_valid() - verify local tt entry and get flags 2703 * @entry_ptr: to be checked local tt entry 2704 * @data_ptr: not used but definition required to satisfy the callback prototype 2705 * @flags: a pointer to store TT flags for this client to 2706 * 2707 * Checks the validity of the given local TT entry. If it is, then the provided 2708 * flags pointer is updated. 2709 * 2710 * Return: true if the entry is a valid, false otherwise. 2711 */ 2712 static bool batadv_tt_local_valid(const void *entry_ptr, 2713 const void *data_ptr, 2714 u8 *flags) 2715 { 2716 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; 2717 2718 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) 2719 return false; 2720 2721 if (flags) 2722 *flags = tt_common_entry->flags; 2723 2724 return true; 2725 } 2726 2727 /** 2728 * batadv_tt_global_valid() - verify global tt entry and get flags 2729 * @entry_ptr: to be checked global tt entry 2730 * @data_ptr: an orig_node object (may be NULL) 2731 * @flags: a pointer to store TT flags for this client to 2732 * 2733 * Checks the validity of the given global TT entry. If it is, then the provided 2734 * flags pointer is updated either with the common (summed) TT flags if data_ptr 2735 * is NULL or the specific, per originator TT flags otherwise. 2736 * 2737 * Return: true if the entry is a valid, false otherwise. 2738 */ 2739 static bool batadv_tt_global_valid(const void *entry_ptr, 2740 const void *data_ptr, 2741 u8 *flags) 2742 { 2743 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; 2744 const struct batadv_tt_global_entry *tt_global_entry; 2745 const struct batadv_orig_node *orig_node = data_ptr; 2746 2747 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM || 2748 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP) 2749 return false; 2750 2751 tt_global_entry = container_of(tt_common_entry, 2752 struct batadv_tt_global_entry, 2753 common); 2754 2755 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node, 2756 flags); 2757 } 2758 2759 /** 2760 * batadv_tt_tvlv_generate() - fill the tvlv buff with the tt entries from the 2761 * specified tt hash 2762 * @bat_priv: the bat priv with all the soft interface information 2763 * @hash: hash table containing the tt entries 2764 * @tt_len: expected tvlv tt data buffer length in number of bytes 2765 * @tvlv_buff: pointer to the buffer to fill with the TT data 2766 * @valid_cb: function to filter tt change entries and to return TT flags 2767 * @cb_data: data passed to the filter function as argument 2768 * 2769 * Fills the tvlv buff with the tt entries from the specified hash. If valid_cb 2770 * is not provided then this becomes a no-op. 2771 */ 2772 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv, 2773 struct batadv_hashtable *hash, 2774 void *tvlv_buff, u16 tt_len, 2775 bool (*valid_cb)(const void *, 2776 const void *, 2777 u8 *flags), 2778 void *cb_data) 2779 { 2780 struct batadv_tt_common_entry *tt_common_entry; 2781 struct batadv_tvlv_tt_change *tt_change; 2782 struct hlist_head *head; 2783 u16 tt_tot, tt_num_entries = 0; 2784 u8 flags; 2785 bool ret; 2786 u32 i; 2787 2788 tt_tot = batadv_tt_entries(tt_len); 2789 tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff; 2790 2791 if (!valid_cb) 2792 return; 2793 2794 rcu_read_lock(); 2795 for (i = 0; i < hash->size; i++) { 2796 head = &hash->table[i]; 2797 2798 hlist_for_each_entry_rcu(tt_common_entry, 2799 head, hash_entry) { 2800 if (tt_tot == tt_num_entries) 2801 break; 2802 2803 ret = valid_cb(tt_common_entry, cb_data, &flags); 2804 if (!ret) 2805 continue; 2806 2807 ether_addr_copy(tt_change->addr, tt_common_entry->addr); 2808 tt_change->flags = flags; 2809 tt_change->vid = htons(tt_common_entry->vid); 2810 memset(tt_change->reserved, 0, 2811 sizeof(tt_change->reserved)); 2812 2813 tt_num_entries++; 2814 tt_change++; 2815 } 2816 } 2817 rcu_read_unlock(); 2818 } 2819 2820 /** 2821 * batadv_tt_global_check_crc() - check if all the CRCs are correct 2822 * @orig_node: originator for which the CRCs have to be checked 2823 * @tt_vlan: pointer to the first tvlv VLAN entry 2824 * @num_vlan: number of tvlv VLAN entries 2825 * 2826 * Return: true if all the received CRCs match the locally stored ones, false 2827 * otherwise 2828 */ 2829 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node, 2830 struct batadv_tvlv_tt_vlan_data *tt_vlan, 2831 u16 num_vlan) 2832 { 2833 struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp; 2834 struct batadv_orig_node_vlan *vlan; 2835 int i, orig_num_vlan; 2836 u32 crc; 2837 2838 /* check if each received CRC matches the locally stored one */ 2839 for (i = 0; i < num_vlan; i++) { 2840 tt_vlan_tmp = tt_vlan + i; 2841 2842 /* if orig_node is a backbone node for this VLAN, don't check 2843 * the CRC as we ignore all the global entries over it 2844 */ 2845 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv, 2846 orig_node->orig, 2847 ntohs(tt_vlan_tmp->vid))) 2848 continue; 2849 2850 vlan = batadv_orig_node_vlan_get(orig_node, 2851 ntohs(tt_vlan_tmp->vid)); 2852 if (!vlan) 2853 return false; 2854 2855 crc = vlan->tt.crc; 2856 batadv_orig_node_vlan_put(vlan); 2857 2858 if (crc != ntohl(tt_vlan_tmp->crc)) 2859 return false; 2860 } 2861 2862 /* check if any excess VLANs exist locally for the originator 2863 * which are not mentioned in the TVLV from the originator. 2864 */ 2865 rcu_read_lock(); 2866 orig_num_vlan = 0; 2867 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) 2868 orig_num_vlan++; 2869 rcu_read_unlock(); 2870 2871 if (orig_num_vlan > num_vlan) 2872 return false; 2873 2874 return true; 2875 } 2876 2877 /** 2878 * batadv_tt_local_update_crc() - update all the local CRCs 2879 * @bat_priv: the bat priv with all the soft interface information 2880 */ 2881 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv) 2882 { 2883 struct batadv_softif_vlan *vlan; 2884 2885 /* recompute the global CRC for each VLAN */ 2886 rcu_read_lock(); 2887 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { 2888 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid); 2889 } 2890 rcu_read_unlock(); 2891 } 2892 2893 /** 2894 * batadv_tt_global_update_crc() - update all the global CRCs for this orig_node 2895 * @bat_priv: the bat priv with all the soft interface information 2896 * @orig_node: the orig_node for which the CRCs have to be updated 2897 */ 2898 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv, 2899 struct batadv_orig_node *orig_node) 2900 { 2901 struct batadv_orig_node_vlan *vlan; 2902 u32 crc; 2903 2904 /* recompute the global CRC for each VLAN */ 2905 rcu_read_lock(); 2906 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) { 2907 /* if orig_node is a backbone node for this VLAN, don't compute 2908 * the CRC as we ignore all the global entries over it 2909 */ 2910 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, 2911 vlan->vid)) 2912 continue; 2913 2914 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid); 2915 vlan->tt.crc = crc; 2916 } 2917 rcu_read_unlock(); 2918 } 2919 2920 /** 2921 * batadv_send_tt_request() - send a TT Request message to a given node 2922 * @bat_priv: the bat priv with all the soft interface information 2923 * @dst_orig_node: the destination of the message 2924 * @ttvn: the version number that the source of the message is looking for 2925 * @tt_vlan: pointer to the first tvlv VLAN object to request 2926 * @num_vlan: number of tvlv VLAN entries 2927 * @full_table: ask for the entire translation table if true, while only for the 2928 * last TT diff otherwise 2929 * 2930 * Return: true if the TT Request was sent, false otherwise 2931 */ 2932 static bool batadv_send_tt_request(struct batadv_priv *bat_priv, 2933 struct batadv_orig_node *dst_orig_node, 2934 u8 ttvn, 2935 struct batadv_tvlv_tt_vlan_data *tt_vlan, 2936 u16 num_vlan, bool full_table) 2937 { 2938 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; 2939 struct batadv_tt_req_node *tt_req_node = NULL; 2940 struct batadv_tvlv_tt_vlan_data *tt_vlan_req; 2941 struct batadv_hard_iface *primary_if; 2942 bool ret = false; 2943 int i, size; 2944 2945 primary_if = batadv_primary_if_get_selected(bat_priv); 2946 if (!primary_if) 2947 goto out; 2948 2949 /* The new tt_req will be issued only if I'm not waiting for a 2950 * reply from the same orig_node yet 2951 */ 2952 tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node); 2953 if (!tt_req_node) 2954 goto out; 2955 2956 size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan; 2957 tvlv_tt_data = kzalloc(size, GFP_ATOMIC); 2958 if (!tvlv_tt_data) 2959 goto out; 2960 2961 tvlv_tt_data->flags = BATADV_TT_REQUEST; 2962 tvlv_tt_data->ttvn = ttvn; 2963 tvlv_tt_data->num_vlan = htons(num_vlan); 2964 2965 /* send all the CRCs within the request. This is needed by intermediate 2966 * nodes to ensure they have the correct table before replying 2967 */ 2968 tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1); 2969 for (i = 0; i < num_vlan; i++) { 2970 tt_vlan_req->vid = tt_vlan->vid; 2971 tt_vlan_req->crc = tt_vlan->crc; 2972 2973 tt_vlan_req++; 2974 tt_vlan++; 2975 } 2976 2977 if (full_table) 2978 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; 2979 2980 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n", 2981 dst_orig_node->orig, full_table ? 'F' : '.'); 2982 2983 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); 2984 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, 2985 dst_orig_node->orig, BATADV_TVLV_TT, 1, 2986 tvlv_tt_data, size); 2987 ret = true; 2988 2989 out: 2990 if (primary_if) 2991 batadv_hardif_put(primary_if); 2992 2993 if (ret && tt_req_node) { 2994 spin_lock_bh(&bat_priv->tt.req_list_lock); 2995 if (!hlist_unhashed(&tt_req_node->list)) { 2996 hlist_del_init(&tt_req_node->list); 2997 batadv_tt_req_node_put(tt_req_node); 2998 } 2999 spin_unlock_bh(&bat_priv->tt.req_list_lock); 3000 } 3001 3002 if (tt_req_node) 3003 batadv_tt_req_node_put(tt_req_node); 3004 3005 kfree(tvlv_tt_data); 3006 return ret; 3007 } 3008 3009 /** 3010 * batadv_send_other_tt_response() - send reply to tt request concerning another 3011 * node's translation table 3012 * @bat_priv: the bat priv with all the soft interface information 3013 * @tt_data: tt data containing the tt request information 3014 * @req_src: mac address of tt request sender 3015 * @req_dst: mac address of tt request recipient 3016 * 3017 * Return: true if tt request reply was sent, false otherwise. 3018 */ 3019 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, 3020 struct batadv_tvlv_tt_data *tt_data, 3021 u8 *req_src, u8 *req_dst) 3022 { 3023 struct batadv_orig_node *req_dst_orig_node; 3024 struct batadv_orig_node *res_dst_orig_node = NULL; 3025 struct batadv_tvlv_tt_change *tt_change; 3026 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; 3027 struct batadv_tvlv_tt_vlan_data *tt_vlan; 3028 bool ret = false, full_table; 3029 u8 orig_ttvn, req_ttvn; 3030 u16 tvlv_len; 3031 s32 tt_len; 3032 3033 batadv_dbg(BATADV_DBG_TT, bat_priv, 3034 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", 3035 req_src, tt_data->ttvn, req_dst, 3036 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.')); 3037 3038 /* Let's get the orig node of the REAL destination */ 3039 req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst); 3040 if (!req_dst_orig_node) 3041 goto out; 3042 3043 res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src); 3044 if (!res_dst_orig_node) 3045 goto out; 3046 3047 orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn); 3048 req_ttvn = tt_data->ttvn; 3049 3050 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1); 3051 /* this node doesn't have the requested data */ 3052 if (orig_ttvn != req_ttvn || 3053 !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan, 3054 ntohs(tt_data->num_vlan))) 3055 goto out; 3056 3057 /* If the full table has been explicitly requested */ 3058 if (tt_data->flags & BATADV_TT_FULL_TABLE || 3059 !req_dst_orig_node->tt_buff) 3060 full_table = true; 3061 else 3062 full_table = false; 3063 3064 /* TT fragmentation hasn't been implemented yet, so send as many 3065 * TT entries fit a single packet as possible only 3066 */ 3067 if (!full_table) { 3068 spin_lock_bh(&req_dst_orig_node->tt_buff_lock); 3069 tt_len = req_dst_orig_node->tt_buff_len; 3070 3071 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node, 3072 &tvlv_tt_data, 3073 &tt_change, 3074 &tt_len); 3075 if (!tt_len) 3076 goto unlock; 3077 3078 /* Copy the last orig_node's OGM buffer */ 3079 memcpy(tt_change, req_dst_orig_node->tt_buff, 3080 req_dst_orig_node->tt_buff_len); 3081 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); 3082 } else { 3083 /* allocate the tvlv, put the tt_data and all the tt_vlan_data 3084 * in the initial part 3085 */ 3086 tt_len = -1; 3087 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node, 3088 &tvlv_tt_data, 3089 &tt_change, 3090 &tt_len); 3091 if (!tt_len) 3092 goto out; 3093 3094 /* fill the rest of the tvlv with the real TT entries */ 3095 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash, 3096 tt_change, tt_len, 3097 batadv_tt_global_valid, 3098 req_dst_orig_node); 3099 } 3100 3101 /* Don't send the response, if larger than fragmented packet. */ 3102 tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len; 3103 if (tt_len > atomic_read(&bat_priv->packet_size_max)) { 3104 net_ratelimited_function(batadv_info, bat_priv->soft_iface, 3105 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n", 3106 res_dst_orig_node->orig); 3107 goto out; 3108 } 3109 3110 tvlv_tt_data->flags = BATADV_TT_RESPONSE; 3111 tvlv_tt_data->ttvn = req_ttvn; 3112 3113 if (full_table) 3114 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; 3115 3116 batadv_dbg(BATADV_DBG_TT, bat_priv, 3117 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n", 3118 res_dst_orig_node->orig, req_dst_orig_node->orig, 3119 full_table ? 'F' : '.', req_ttvn); 3120 3121 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); 3122 3123 batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig, 3124 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data, 3125 tvlv_len); 3126 3127 ret = true; 3128 goto out; 3129 3130 unlock: 3131 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); 3132 3133 out: 3134 if (res_dst_orig_node) 3135 batadv_orig_node_put(res_dst_orig_node); 3136 if (req_dst_orig_node) 3137 batadv_orig_node_put(req_dst_orig_node); 3138 kfree(tvlv_tt_data); 3139 return ret; 3140 } 3141 3142 /** 3143 * batadv_send_my_tt_response() - send reply to tt request concerning this 3144 * node's translation table 3145 * @bat_priv: the bat priv with all the soft interface information 3146 * @tt_data: tt data containing the tt request information 3147 * @req_src: mac address of tt request sender 3148 * 3149 * Return: true if tt request reply was sent, false otherwise. 3150 */ 3151 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv, 3152 struct batadv_tvlv_tt_data *tt_data, 3153 u8 *req_src) 3154 { 3155 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; 3156 struct batadv_hard_iface *primary_if = NULL; 3157 struct batadv_tvlv_tt_change *tt_change; 3158 struct batadv_orig_node *orig_node; 3159 u8 my_ttvn, req_ttvn; 3160 u16 tvlv_len; 3161 bool full_table; 3162 s32 tt_len; 3163 3164 batadv_dbg(BATADV_DBG_TT, bat_priv, 3165 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", 3166 req_src, tt_data->ttvn, 3167 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.')); 3168 3169 spin_lock_bh(&bat_priv->tt.commit_lock); 3170 3171 my_ttvn = (u8)atomic_read(&bat_priv->tt.vn); 3172 req_ttvn = tt_data->ttvn; 3173 3174 orig_node = batadv_orig_hash_find(bat_priv, req_src); 3175 if (!orig_node) 3176 goto out; 3177 3178 primary_if = batadv_primary_if_get_selected(bat_priv); 3179 if (!primary_if) 3180 goto out; 3181 3182 /* If the full table has been explicitly requested or the gap 3183 * is too big send the whole local translation table 3184 */ 3185 if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || 3186 !bat_priv->tt.last_changeset) 3187 full_table = true; 3188 else 3189 full_table = false; 3190 3191 /* TT fragmentation hasn't been implemented yet, so send as many 3192 * TT entries fit a single packet as possible only 3193 */ 3194 if (!full_table) { 3195 spin_lock_bh(&bat_priv->tt.last_changeset_lock); 3196 3197 tt_len = bat_priv->tt.last_changeset_len; 3198 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, 3199 &tvlv_tt_data, 3200 &tt_change, 3201 &tt_len); 3202 if (!tt_len || !tvlv_len) 3203 goto unlock; 3204 3205 /* Copy the last orig_node's OGM buffer */ 3206 memcpy(tt_change, bat_priv->tt.last_changeset, 3207 bat_priv->tt.last_changeset_len); 3208 spin_unlock_bh(&bat_priv->tt.last_changeset_lock); 3209 } else { 3210 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn); 3211 3212 /* allocate the tvlv, put the tt_data and all the tt_vlan_data 3213 * in the initial part 3214 */ 3215 tt_len = -1; 3216 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, 3217 &tvlv_tt_data, 3218 &tt_change, 3219 &tt_len); 3220 if (!tt_len || !tvlv_len) 3221 goto out; 3222 3223 /* fill the rest of the tvlv with the real TT entries */ 3224 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash, 3225 tt_change, tt_len, 3226 batadv_tt_local_valid, NULL); 3227 } 3228 3229 tvlv_tt_data->flags = BATADV_TT_RESPONSE; 3230 tvlv_tt_data->ttvn = req_ttvn; 3231 3232 if (full_table) 3233 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; 3234 3235 batadv_dbg(BATADV_DBG_TT, bat_priv, 3236 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n", 3237 orig_node->orig, full_table ? 'F' : '.', req_ttvn); 3238 3239 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); 3240 3241 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, 3242 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data, 3243 tvlv_len); 3244 3245 goto out; 3246 3247 unlock: 3248 spin_unlock_bh(&bat_priv->tt.last_changeset_lock); 3249 out: 3250 spin_unlock_bh(&bat_priv->tt.commit_lock); 3251 if (orig_node) 3252 batadv_orig_node_put(orig_node); 3253 if (primary_if) 3254 batadv_hardif_put(primary_if); 3255 kfree(tvlv_tt_data); 3256 /* The packet was for this host, so it doesn't need to be re-routed */ 3257 return true; 3258 } 3259 3260 /** 3261 * batadv_send_tt_response() - send reply to tt request 3262 * @bat_priv: the bat priv with all the soft interface information 3263 * @tt_data: tt data containing the tt request information 3264 * @req_src: mac address of tt request sender 3265 * @req_dst: mac address of tt request recipient 3266 * 3267 * Return: true if tt request reply was sent, false otherwise. 3268 */ 3269 static bool batadv_send_tt_response(struct batadv_priv *bat_priv, 3270 struct batadv_tvlv_tt_data *tt_data, 3271 u8 *req_src, u8 *req_dst) 3272 { 3273 if (batadv_is_my_mac(bat_priv, req_dst)) 3274 return batadv_send_my_tt_response(bat_priv, tt_data, req_src); 3275 return batadv_send_other_tt_response(bat_priv, tt_data, req_src, 3276 req_dst); 3277 } 3278 3279 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, 3280 struct batadv_orig_node *orig_node, 3281 struct batadv_tvlv_tt_change *tt_change, 3282 u16 tt_num_changes, u8 ttvn) 3283 { 3284 int i; 3285 int roams; 3286 3287 for (i = 0; i < tt_num_changes; i++) { 3288 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { 3289 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; 3290 batadv_tt_global_del(bat_priv, orig_node, 3291 (tt_change + i)->addr, 3292 ntohs((tt_change + i)->vid), 3293 "tt removed by changes", 3294 roams); 3295 } else { 3296 if (!batadv_tt_global_add(bat_priv, orig_node, 3297 (tt_change + i)->addr, 3298 ntohs((tt_change + i)->vid), 3299 (tt_change + i)->flags, ttvn)) 3300 /* In case of problem while storing a 3301 * global_entry, we stop the updating 3302 * procedure without committing the 3303 * ttvn change. This will avoid to send 3304 * corrupted data on tt_request 3305 */ 3306 return; 3307 } 3308 } 3309 set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized); 3310 } 3311 3312 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, 3313 struct batadv_tvlv_tt_change *tt_change, 3314 u8 ttvn, u8 *resp_src, 3315 u16 num_entries) 3316 { 3317 struct batadv_orig_node *orig_node; 3318 3319 orig_node = batadv_orig_hash_find(bat_priv, resp_src); 3320 if (!orig_node) 3321 goto out; 3322 3323 /* Purge the old table first.. */ 3324 batadv_tt_global_del_orig(bat_priv, orig_node, -1, 3325 "Received full table"); 3326 3327 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries, 3328 ttvn); 3329 3330 spin_lock_bh(&orig_node->tt_buff_lock); 3331 kfree(orig_node->tt_buff); 3332 orig_node->tt_buff_len = 0; 3333 orig_node->tt_buff = NULL; 3334 spin_unlock_bh(&orig_node->tt_buff_lock); 3335 3336 atomic_set(&orig_node->last_ttvn, ttvn); 3337 3338 out: 3339 if (orig_node) 3340 batadv_orig_node_put(orig_node); 3341 } 3342 3343 static void batadv_tt_update_changes(struct batadv_priv *bat_priv, 3344 struct batadv_orig_node *orig_node, 3345 u16 tt_num_changes, u8 ttvn, 3346 struct batadv_tvlv_tt_change *tt_change) 3347 { 3348 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, 3349 tt_num_changes, ttvn); 3350 3351 batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change, 3352 batadv_tt_len(tt_num_changes)); 3353 atomic_set(&orig_node->last_ttvn, ttvn); 3354 } 3355 3356 /** 3357 * batadv_is_my_client() - check if a client is served by the local node 3358 * @bat_priv: the bat priv with all the soft interface information 3359 * @addr: the mac address of the client to check 3360 * @vid: VLAN identifier 3361 * 3362 * Return: true if the client is served by this node, false otherwise. 3363 */ 3364 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr, 3365 unsigned short vid) 3366 { 3367 struct batadv_tt_local_entry *tt_local_entry; 3368 bool ret = false; 3369 3370 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid); 3371 if (!tt_local_entry) 3372 goto out; 3373 /* Check if the client has been logically deleted (but is kept for 3374 * consistency purpose) 3375 */ 3376 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) || 3377 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM)) 3378 goto out; 3379 ret = true; 3380 out: 3381 if (tt_local_entry) 3382 batadv_tt_local_entry_put(tt_local_entry); 3383 return ret; 3384 } 3385 3386 /** 3387 * batadv_handle_tt_response() - process incoming tt reply 3388 * @bat_priv: the bat priv with all the soft interface information 3389 * @tt_data: tt data containing the tt request information 3390 * @resp_src: mac address of tt reply sender 3391 * @num_entries: number of tt change entries appended to the tt data 3392 */ 3393 static void batadv_handle_tt_response(struct batadv_priv *bat_priv, 3394 struct batadv_tvlv_tt_data *tt_data, 3395 u8 *resp_src, u16 num_entries) 3396 { 3397 struct batadv_tt_req_node *node; 3398 struct hlist_node *safe; 3399 struct batadv_orig_node *orig_node = NULL; 3400 struct batadv_tvlv_tt_change *tt_change; 3401 u8 *tvlv_ptr = (u8 *)tt_data; 3402 u16 change_offset; 3403 3404 batadv_dbg(BATADV_DBG_TT, bat_priv, 3405 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", 3406 resp_src, tt_data->ttvn, num_entries, 3407 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.')); 3408 3409 orig_node = batadv_orig_hash_find(bat_priv, resp_src); 3410 if (!orig_node) 3411 goto out; 3412 3413 spin_lock_bh(&orig_node->tt_lock); 3414 3415 change_offset = sizeof(struct batadv_tvlv_tt_vlan_data); 3416 change_offset *= ntohs(tt_data->num_vlan); 3417 change_offset += sizeof(*tt_data); 3418 tvlv_ptr += change_offset; 3419 3420 tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr; 3421 if (tt_data->flags & BATADV_TT_FULL_TABLE) { 3422 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn, 3423 resp_src, num_entries); 3424 } else { 3425 batadv_tt_update_changes(bat_priv, orig_node, num_entries, 3426 tt_data->ttvn, tt_change); 3427 } 3428 3429 /* Recalculate the CRC for this orig_node and store it */ 3430 batadv_tt_global_update_crc(bat_priv, orig_node); 3431 3432 spin_unlock_bh(&orig_node->tt_lock); 3433 3434 /* Delete the tt_req_node from pending tt_requests list */ 3435 spin_lock_bh(&bat_priv->tt.req_list_lock); 3436 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { 3437 if (!batadv_compare_eth(node->addr, resp_src)) 3438 continue; 3439 hlist_del_init(&node->list); 3440 batadv_tt_req_node_put(node); 3441 } 3442 3443 spin_unlock_bh(&bat_priv->tt.req_list_lock); 3444 out: 3445 if (orig_node) 3446 batadv_orig_node_put(orig_node); 3447 } 3448 3449 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) 3450 { 3451 struct batadv_tt_roam_node *node, *safe; 3452 3453 spin_lock_bh(&bat_priv->tt.roam_list_lock); 3454 3455 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { 3456 list_del(&node->list); 3457 kmem_cache_free(batadv_tt_roam_cache, node); 3458 } 3459 3460 spin_unlock_bh(&bat_priv->tt.roam_list_lock); 3461 } 3462 3463 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) 3464 { 3465 struct batadv_tt_roam_node *node, *safe; 3466 3467 spin_lock_bh(&bat_priv->tt.roam_list_lock); 3468 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { 3469 if (!batadv_has_timed_out(node->first_time, 3470 BATADV_ROAMING_MAX_TIME)) 3471 continue; 3472 3473 list_del(&node->list); 3474 kmem_cache_free(batadv_tt_roam_cache, node); 3475 } 3476 spin_unlock_bh(&bat_priv->tt.roam_list_lock); 3477 } 3478 3479 /** 3480 * batadv_tt_check_roam_count() - check if a client has roamed too frequently 3481 * @bat_priv: the bat priv with all the soft interface information 3482 * @client: mac address of the roaming client 3483 * 3484 * This function checks whether the client already reached the 3485 * maximum number of possible roaming phases. In this case the ROAMING_ADV 3486 * will not be sent. 3487 * 3488 * Return: true if the ROAMING_ADV can be sent, false otherwise 3489 */ 3490 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client) 3491 { 3492 struct batadv_tt_roam_node *tt_roam_node; 3493 bool ret = false; 3494 3495 spin_lock_bh(&bat_priv->tt.roam_list_lock); 3496 /* The new tt_req will be issued only if I'm not waiting for a 3497 * reply from the same orig_node yet 3498 */ 3499 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) { 3500 if (!batadv_compare_eth(tt_roam_node->addr, client)) 3501 continue; 3502 3503 if (batadv_has_timed_out(tt_roam_node->first_time, 3504 BATADV_ROAMING_MAX_TIME)) 3505 continue; 3506 3507 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) 3508 /* Sorry, you roamed too many times! */ 3509 goto unlock; 3510 ret = true; 3511 break; 3512 } 3513 3514 if (!ret) { 3515 tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache, 3516 GFP_ATOMIC); 3517 if (!tt_roam_node) 3518 goto unlock; 3519 3520 tt_roam_node->first_time = jiffies; 3521 atomic_set(&tt_roam_node->counter, 3522 BATADV_ROAMING_MAX_COUNT - 1); 3523 ether_addr_copy(tt_roam_node->addr, client); 3524 3525 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list); 3526 ret = true; 3527 } 3528 3529 unlock: 3530 spin_unlock_bh(&bat_priv->tt.roam_list_lock); 3531 return ret; 3532 } 3533 3534 /** 3535 * batadv_send_roam_adv() - send a roaming advertisement message 3536 * @bat_priv: the bat priv with all the soft interface information 3537 * @client: mac address of the roaming client 3538 * @vid: VLAN identifier 3539 * @orig_node: message destination 3540 * 3541 * Send a ROAMING_ADV message to the node which was previously serving this 3542 * client. This is done to inform the node that from now on all traffic destined 3543 * for this particular roamed client has to be forwarded to the sender of the 3544 * roaming message. 3545 */ 3546 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client, 3547 unsigned short vid, 3548 struct batadv_orig_node *orig_node) 3549 { 3550 struct batadv_hard_iface *primary_if; 3551 struct batadv_tvlv_roam_adv tvlv_roam; 3552 3553 primary_if = batadv_primary_if_get_selected(bat_priv); 3554 if (!primary_if) 3555 goto out; 3556 3557 /* before going on we have to check whether the client has 3558 * already roamed to us too many times 3559 */ 3560 if (!batadv_tt_check_roam_count(bat_priv, client)) 3561 goto out; 3562 3563 batadv_dbg(BATADV_DBG_TT, bat_priv, 3564 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n", 3565 orig_node->orig, client, batadv_print_vid(vid)); 3566 3567 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); 3568 3569 memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client)); 3570 tvlv_roam.vid = htons(vid); 3571 3572 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, 3573 orig_node->orig, BATADV_TVLV_ROAM, 1, 3574 &tvlv_roam, sizeof(tvlv_roam)); 3575 3576 out: 3577 if (primary_if) 3578 batadv_hardif_put(primary_if); 3579 } 3580 3581 static void batadv_tt_purge(struct work_struct *work) 3582 { 3583 struct delayed_work *delayed_work; 3584 struct batadv_priv_tt *priv_tt; 3585 struct batadv_priv *bat_priv; 3586 3587 delayed_work = to_delayed_work(work); 3588 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work); 3589 bat_priv = container_of(priv_tt, struct batadv_priv, tt); 3590 3591 batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT); 3592 batadv_tt_global_purge(bat_priv); 3593 batadv_tt_req_purge(bat_priv); 3594 batadv_tt_roam_purge(bat_priv); 3595 3596 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, 3597 msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); 3598 } 3599 3600 /** 3601 * batadv_tt_free() - Free translation table of soft interface 3602 * @bat_priv: the bat priv with all the soft interface information 3603 */ 3604 void batadv_tt_free(struct batadv_priv *bat_priv) 3605 { 3606 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_ROAM, 1); 3607 3608 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1); 3609 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1); 3610 3611 cancel_delayed_work_sync(&bat_priv->tt.work); 3612 3613 batadv_tt_local_table_free(bat_priv); 3614 batadv_tt_global_table_free(bat_priv); 3615 batadv_tt_req_list_free(bat_priv); 3616 batadv_tt_changes_list_free(bat_priv); 3617 batadv_tt_roam_list_free(bat_priv); 3618 3619 kfree(bat_priv->tt.last_changeset); 3620 } 3621 3622 /** 3623 * batadv_tt_local_set_flags() - set or unset the specified flags on the local 3624 * table and possibly count them in the TT size 3625 * @bat_priv: the bat priv with all the soft interface information 3626 * @flags: the flag to switch 3627 * @enable: whether to set or unset the flag 3628 * @count: whether to increase the TT size by the number of changed entries 3629 */ 3630 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags, 3631 bool enable, bool count) 3632 { 3633 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 3634 struct batadv_tt_common_entry *tt_common_entry; 3635 struct hlist_head *head; 3636 u32 i; 3637 3638 if (!hash) 3639 return; 3640 3641 for (i = 0; i < hash->size; i++) { 3642 head = &hash->table[i]; 3643 3644 rcu_read_lock(); 3645 hlist_for_each_entry_rcu(tt_common_entry, 3646 head, hash_entry) { 3647 if (enable) { 3648 if ((tt_common_entry->flags & flags) == flags) 3649 continue; 3650 tt_common_entry->flags |= flags; 3651 } else { 3652 if (!(tt_common_entry->flags & flags)) 3653 continue; 3654 tt_common_entry->flags &= ~flags; 3655 } 3656 3657 if (!count) 3658 continue; 3659 3660 batadv_tt_local_size_inc(bat_priv, 3661 tt_common_entry->vid); 3662 } 3663 rcu_read_unlock(); 3664 } 3665 } 3666 3667 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ 3668 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) 3669 { 3670 struct batadv_hashtable *hash = bat_priv->tt.local_hash; 3671 struct batadv_tt_common_entry *tt_common; 3672 struct batadv_tt_local_entry *tt_local; 3673 struct hlist_node *node_tmp; 3674 struct hlist_head *head; 3675 spinlock_t *list_lock; /* protects write access to the hash lists */ 3676 u32 i; 3677 3678 if (!hash) 3679 return; 3680 3681 for (i = 0; i < hash->size; i++) { 3682 head = &hash->table[i]; 3683 list_lock = &hash->list_locks[i]; 3684 3685 spin_lock_bh(list_lock); 3686 hlist_for_each_entry_safe(tt_common, node_tmp, head, 3687 hash_entry) { 3688 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) 3689 continue; 3690 3691 batadv_dbg(BATADV_DBG_TT, bat_priv, 3692 "Deleting local tt entry (%pM, vid: %d): pending\n", 3693 tt_common->addr, 3694 batadv_print_vid(tt_common->vid)); 3695 3696 batadv_tt_local_size_dec(bat_priv, tt_common->vid); 3697 hlist_del_rcu(&tt_common->hash_entry); 3698 tt_local = container_of(tt_common, 3699 struct batadv_tt_local_entry, 3700 common); 3701 3702 batadv_tt_local_entry_put(tt_local); 3703 } 3704 spin_unlock_bh(list_lock); 3705 } 3706 } 3707 3708 /** 3709 * batadv_tt_local_commit_changes_nolock() - commit all pending local tt changes 3710 * which have been queued in the time since the last commit 3711 * @bat_priv: the bat priv with all the soft interface information 3712 * 3713 * Caller must hold tt->commit_lock. 3714 */ 3715 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv) 3716 { 3717 lockdep_assert_held(&bat_priv->tt.commit_lock); 3718 3719 if (atomic_read(&bat_priv->tt.local_changes) < 1) { 3720 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt)) 3721 batadv_tt_tvlv_container_update(bat_priv); 3722 return; 3723 } 3724 3725 batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true); 3726 3727 batadv_tt_local_purge_pending_clients(bat_priv); 3728 batadv_tt_local_update_crc(bat_priv); 3729 3730 /* Increment the TTVN only once per OGM interval */ 3731 atomic_inc(&bat_priv->tt.vn); 3732 batadv_dbg(BATADV_DBG_TT, bat_priv, 3733 "Local changes committed, updating to ttvn %u\n", 3734 (u8)atomic_read(&bat_priv->tt.vn)); 3735 3736 /* reset the sending counter */ 3737 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); 3738 batadv_tt_tvlv_container_update(bat_priv); 3739 } 3740 3741 /** 3742 * batadv_tt_local_commit_changes() - commit all pending local tt changes which 3743 * have been queued in the time since the last commit 3744 * @bat_priv: the bat priv with all the soft interface information 3745 */ 3746 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) 3747 { 3748 spin_lock_bh(&bat_priv->tt.commit_lock); 3749 batadv_tt_local_commit_changes_nolock(bat_priv); 3750 spin_unlock_bh(&bat_priv->tt.commit_lock); 3751 } 3752 3753 /** 3754 * batadv_is_ap_isolated() - Check if packet from upper layer should be dropped 3755 * @bat_priv: the bat priv with all the soft interface information 3756 * @src: source mac address of packet 3757 * @dst: destination mac address of packet 3758 * @vid: vlan id of packet 3759 * 3760 * Return: true when src+dst(+vid) pair should be isolated, false otherwise 3761 */ 3762 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst, 3763 unsigned short vid) 3764 { 3765 struct batadv_tt_local_entry *tt_local_entry; 3766 struct batadv_tt_global_entry *tt_global_entry; 3767 struct batadv_softif_vlan *vlan; 3768 bool ret = false; 3769 3770 vlan = batadv_softif_vlan_get(bat_priv, vid); 3771 if (!vlan) 3772 return false; 3773 3774 if (!atomic_read(&vlan->ap_isolation)) 3775 goto vlan_put; 3776 3777 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid); 3778 if (!tt_local_entry) 3779 goto vlan_put; 3780 3781 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid); 3782 if (!tt_global_entry) 3783 goto local_entry_put; 3784 3785 if (_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) 3786 ret = true; 3787 3788 batadv_tt_global_entry_put(tt_global_entry); 3789 local_entry_put: 3790 batadv_tt_local_entry_put(tt_local_entry); 3791 vlan_put: 3792 batadv_softif_vlan_put(vlan); 3793 return ret; 3794 } 3795 3796 /** 3797 * batadv_tt_update_orig() - update global translation table with new tt 3798 * information received via ogms 3799 * @bat_priv: the bat priv with all the soft interface information 3800 * @orig_node: the orig_node of the ogm 3801 * @tt_buff: pointer to the first tvlv VLAN entry 3802 * @tt_num_vlan: number of tvlv VLAN entries 3803 * @tt_change: pointer to the first entry in the TT buffer 3804 * @tt_num_changes: number of tt changes inside the tt buffer 3805 * @ttvn: translation table version number of this changeset 3806 */ 3807 static void batadv_tt_update_orig(struct batadv_priv *bat_priv, 3808 struct batadv_orig_node *orig_node, 3809 const void *tt_buff, u16 tt_num_vlan, 3810 struct batadv_tvlv_tt_change *tt_change, 3811 u16 tt_num_changes, u8 ttvn) 3812 { 3813 u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); 3814 struct batadv_tvlv_tt_vlan_data *tt_vlan; 3815 bool full_table = true; 3816 bool has_tt_init; 3817 3818 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff; 3819 has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT, 3820 &orig_node->capa_initialized); 3821 3822 /* orig table not initialised AND first diff is in the OGM OR the ttvn 3823 * increased by one -> we can apply the attached changes 3824 */ 3825 if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) { 3826 /* the OGM could not contain the changes due to their size or 3827 * because they have already been sent BATADV_TT_OGM_APPEND_MAX 3828 * times. 3829 * In this case send a tt request 3830 */ 3831 if (!tt_num_changes) { 3832 full_table = false; 3833 goto request_table; 3834 } 3835 3836 spin_lock_bh(&orig_node->tt_lock); 3837 3838 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, 3839 ttvn, tt_change); 3840 3841 /* Even if we received the precomputed crc with the OGM, we 3842 * prefer to recompute it to spot any possible inconsistency 3843 * in the global table 3844 */ 3845 batadv_tt_global_update_crc(bat_priv, orig_node); 3846 3847 spin_unlock_bh(&orig_node->tt_lock); 3848 3849 /* The ttvn alone is not enough to guarantee consistency 3850 * because a single value could represent different states 3851 * (due to the wrap around). Thus a node has to check whether 3852 * the resulting table (after applying the changes) is still 3853 * consistent or not. E.g. a node could disconnect while its 3854 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case 3855 * checking the CRC value is mandatory to detect the 3856 * inconsistency 3857 */ 3858 if (!batadv_tt_global_check_crc(orig_node, tt_vlan, 3859 tt_num_vlan)) 3860 goto request_table; 3861 } else { 3862 /* if we missed more than one change or our tables are not 3863 * in sync anymore -> request fresh tt data 3864 */ 3865 if (!has_tt_init || ttvn != orig_ttvn || 3866 !batadv_tt_global_check_crc(orig_node, tt_vlan, 3867 tt_num_vlan)) { 3868 request_table: 3869 batadv_dbg(BATADV_DBG_TT, bat_priv, 3870 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n", 3871 orig_node->orig, ttvn, orig_ttvn, 3872 tt_num_changes); 3873 batadv_send_tt_request(bat_priv, orig_node, ttvn, 3874 tt_vlan, tt_num_vlan, 3875 full_table); 3876 return; 3877 } 3878 } 3879 } 3880 3881 /** 3882 * batadv_tt_global_client_is_roaming() - check if a client is marked as roaming 3883 * @bat_priv: the bat priv with all the soft interface information 3884 * @addr: the mac address of the client to check 3885 * @vid: VLAN identifier 3886 * 3887 * Return: true if we know that the client has moved from its old originator 3888 * to another one. This entry is still kept for consistency purposes and will be 3889 * deleted later by a DEL or because of timeout 3890 */ 3891 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, 3892 u8 *addr, unsigned short vid) 3893 { 3894 struct batadv_tt_global_entry *tt_global_entry; 3895 bool ret = false; 3896 3897 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid); 3898 if (!tt_global_entry) 3899 goto out; 3900 3901 ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; 3902 batadv_tt_global_entry_put(tt_global_entry); 3903 out: 3904 return ret; 3905 } 3906 3907 /** 3908 * batadv_tt_local_client_is_roaming() - tells whether the client is roaming 3909 * @bat_priv: the bat priv with all the soft interface information 3910 * @addr: the mac address of the local client to query 3911 * @vid: VLAN identifier 3912 * 3913 * Return: true if the local client is known to be roaming (it is not served by 3914 * this node anymore) or not. If yes, the client is still present in the table 3915 * to keep the latter consistent with the node TTVN 3916 */ 3917 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv, 3918 u8 *addr, unsigned short vid) 3919 { 3920 struct batadv_tt_local_entry *tt_local_entry; 3921 bool ret = false; 3922 3923 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid); 3924 if (!tt_local_entry) 3925 goto out; 3926 3927 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM; 3928 batadv_tt_local_entry_put(tt_local_entry); 3929 out: 3930 return ret; 3931 } 3932 3933 /** 3934 * batadv_tt_add_temporary_global_entry() - Add temporary entry to global TT 3935 * @bat_priv: the bat priv with all the soft interface information 3936 * @orig_node: orig node which the temporary entry should be associated with 3937 * @addr: mac address of the client 3938 * @vid: VLAN id of the new temporary global translation table 3939 * 3940 * Return: true when temporary tt entry could be added, false otherwise 3941 */ 3942 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, 3943 struct batadv_orig_node *orig_node, 3944 const unsigned char *addr, 3945 unsigned short vid) 3946 { 3947 /* ignore loop detect macs, they are not supposed to be in the tt local 3948 * data as well. 3949 */ 3950 if (batadv_bla_is_loopdetect_mac(addr)) 3951 return false; 3952 3953 if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid, 3954 BATADV_TT_CLIENT_TEMP, 3955 atomic_read(&orig_node->last_ttvn))) 3956 return false; 3957 3958 batadv_dbg(BATADV_DBG_TT, bat_priv, 3959 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n", 3960 addr, batadv_print_vid(vid), orig_node->orig); 3961 3962 return true; 3963 } 3964 3965 /** 3966 * batadv_tt_local_resize_to_mtu() - resize the local translation table fit the 3967 * maximum packet size that can be transported through the mesh 3968 * @soft_iface: netdev struct of the mesh interface 3969 * 3970 * Remove entries older than 'timeout' and half timeout if more entries need 3971 * to be removed. 3972 */ 3973 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface) 3974 { 3975 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 3976 int packet_size_max = atomic_read(&bat_priv->packet_size_max); 3977 int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2; 3978 bool reduced = false; 3979 3980 spin_lock_bh(&bat_priv->tt.commit_lock); 3981 3982 while (true) { 3983 table_size = batadv_tt_local_table_transmit_size(bat_priv); 3984 if (packet_size_max >= table_size) 3985 break; 3986 3987 batadv_tt_local_purge(bat_priv, timeout); 3988 batadv_tt_local_purge_pending_clients(bat_priv); 3989 3990 timeout /= 2; 3991 reduced = true; 3992 net_ratelimited_function(batadv_info, soft_iface, 3993 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n", 3994 packet_size_max); 3995 } 3996 3997 /* commit these changes immediately, to avoid synchronization problem 3998 * with the TTVN 3999 */ 4000 if (reduced) 4001 batadv_tt_local_commit_changes_nolock(bat_priv); 4002 4003 spin_unlock_bh(&bat_priv->tt.commit_lock); 4004 } 4005 4006 /** 4007 * batadv_tt_tvlv_ogm_handler_v1() - process incoming tt tvlv container 4008 * @bat_priv: the bat priv with all the soft interface information 4009 * @orig: the orig_node of the ogm 4010 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) 4011 * @tvlv_value: tvlv buffer containing the gateway data 4012 * @tvlv_value_len: tvlv buffer length 4013 */ 4014 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, 4015 struct batadv_orig_node *orig, 4016 u8 flags, void *tvlv_value, 4017 u16 tvlv_value_len) 4018 { 4019 struct batadv_tvlv_tt_vlan_data *tt_vlan; 4020 struct batadv_tvlv_tt_change *tt_change; 4021 struct batadv_tvlv_tt_data *tt_data; 4022 u16 num_entries, num_vlan; 4023 4024 if (tvlv_value_len < sizeof(*tt_data)) 4025 return; 4026 4027 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value; 4028 tvlv_value_len -= sizeof(*tt_data); 4029 4030 num_vlan = ntohs(tt_data->num_vlan); 4031 4032 if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan) 4033 return; 4034 4035 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1); 4036 tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan); 4037 tvlv_value_len -= sizeof(*tt_vlan) * num_vlan; 4038 4039 num_entries = batadv_tt_entries(tvlv_value_len); 4040 4041 batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change, 4042 num_entries, tt_data->ttvn); 4043 } 4044 4045 /** 4046 * batadv_tt_tvlv_unicast_handler_v1() - process incoming (unicast) tt tvlv 4047 * container 4048 * @bat_priv: the bat priv with all the soft interface information 4049 * @src: mac address of tt tvlv sender 4050 * @dst: mac address of tt tvlv recipient 4051 * @tvlv_value: tvlv buffer containing the tt data 4052 * @tvlv_value_len: tvlv buffer length 4053 * 4054 * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS 4055 * otherwise. 4056 */ 4057 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, 4058 u8 *src, u8 *dst, 4059 void *tvlv_value, 4060 u16 tvlv_value_len) 4061 { 4062 struct batadv_tvlv_tt_data *tt_data; 4063 u16 tt_vlan_len, tt_num_entries; 4064 char tt_flag; 4065 bool ret; 4066 4067 if (tvlv_value_len < sizeof(*tt_data)) 4068 return NET_RX_SUCCESS; 4069 4070 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value; 4071 tvlv_value_len -= sizeof(*tt_data); 4072 4073 tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data); 4074 tt_vlan_len *= ntohs(tt_data->num_vlan); 4075 4076 if (tvlv_value_len < tt_vlan_len) 4077 return NET_RX_SUCCESS; 4078 4079 tvlv_value_len -= tt_vlan_len; 4080 tt_num_entries = batadv_tt_entries(tvlv_value_len); 4081 4082 switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) { 4083 case BATADV_TT_REQUEST: 4084 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); 4085 4086 /* If this node cannot provide a TT response the tt_request is 4087 * forwarded 4088 */ 4089 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst); 4090 if (!ret) { 4091 if (tt_data->flags & BATADV_TT_FULL_TABLE) 4092 tt_flag = 'F'; 4093 else 4094 tt_flag = '.'; 4095 4096 batadv_dbg(BATADV_DBG_TT, bat_priv, 4097 "Routing TT_REQUEST to %pM [%c]\n", 4098 dst, tt_flag); 4099 /* tvlv API will re-route the packet */ 4100 return NET_RX_DROP; 4101 } 4102 break; 4103 case BATADV_TT_RESPONSE: 4104 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); 4105 4106 if (batadv_is_my_mac(bat_priv, dst)) { 4107 batadv_handle_tt_response(bat_priv, tt_data, 4108 src, tt_num_entries); 4109 return NET_RX_SUCCESS; 4110 } 4111 4112 if (tt_data->flags & BATADV_TT_FULL_TABLE) 4113 tt_flag = 'F'; 4114 else 4115 tt_flag = '.'; 4116 4117 batadv_dbg(BATADV_DBG_TT, bat_priv, 4118 "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag); 4119 4120 /* tvlv API will re-route the packet */ 4121 return NET_RX_DROP; 4122 } 4123 4124 return NET_RX_SUCCESS; 4125 } 4126 4127 /** 4128 * batadv_roam_tvlv_unicast_handler_v1() - process incoming tt roam tvlv 4129 * container 4130 * @bat_priv: the bat priv with all the soft interface information 4131 * @src: mac address of tt tvlv sender 4132 * @dst: mac address of tt tvlv recipient 4133 * @tvlv_value: tvlv buffer containing the tt data 4134 * @tvlv_value_len: tvlv buffer length 4135 * 4136 * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS 4137 * otherwise. 4138 */ 4139 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, 4140 u8 *src, u8 *dst, 4141 void *tvlv_value, 4142 u16 tvlv_value_len) 4143 { 4144 struct batadv_tvlv_roam_adv *roaming_adv; 4145 struct batadv_orig_node *orig_node = NULL; 4146 4147 /* If this node is not the intended recipient of the 4148 * roaming advertisement the packet is forwarded 4149 * (the tvlv API will re-route the packet). 4150 */ 4151 if (!batadv_is_my_mac(bat_priv, dst)) 4152 return NET_RX_DROP; 4153 4154 if (tvlv_value_len < sizeof(*roaming_adv)) 4155 goto out; 4156 4157 orig_node = batadv_orig_hash_find(bat_priv, src); 4158 if (!orig_node) 4159 goto out; 4160 4161 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); 4162 roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value; 4163 4164 batadv_dbg(BATADV_DBG_TT, bat_priv, 4165 "Received ROAMING_ADV from %pM (client %pM)\n", 4166 src, roaming_adv->client); 4167 4168 batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client, 4169 ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM, 4170 atomic_read(&orig_node->last_ttvn) + 1); 4171 4172 out: 4173 if (orig_node) 4174 batadv_orig_node_put(orig_node); 4175 return NET_RX_SUCCESS; 4176 } 4177 4178 /** 4179 * batadv_tt_init() - initialise the translation table internals 4180 * @bat_priv: the bat priv with all the soft interface information 4181 * 4182 * Return: 0 on success or negative error number in case of failure. 4183 */ 4184 int batadv_tt_init(struct batadv_priv *bat_priv) 4185 { 4186 int ret; 4187 4188 /* synchronized flags must be remote */ 4189 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK)); 4190 4191 ret = batadv_tt_local_init(bat_priv); 4192 if (ret < 0) 4193 return ret; 4194 4195 ret = batadv_tt_global_init(bat_priv); 4196 if (ret < 0) 4197 return ret; 4198 4199 batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1, 4200 batadv_tt_tvlv_unicast_handler_v1, 4201 BATADV_TVLV_TT, 1, BATADV_NO_FLAGS); 4202 4203 batadv_tvlv_handler_register(bat_priv, NULL, 4204 batadv_roam_tvlv_unicast_handler_v1, 4205 BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS); 4206 4207 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge); 4208 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, 4209 msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); 4210 4211 return 1; 4212 } 4213 4214 /** 4215 * batadv_tt_global_is_isolated() - check if a client is marked as isolated 4216 * @bat_priv: the bat priv with all the soft interface information 4217 * @addr: the mac address of the client 4218 * @vid: the identifier of the VLAN where this client is connected 4219 * 4220 * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false 4221 * otherwise 4222 */ 4223 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv, 4224 const u8 *addr, unsigned short vid) 4225 { 4226 struct batadv_tt_global_entry *tt; 4227 bool ret; 4228 4229 tt = batadv_tt_global_hash_find(bat_priv, addr, vid); 4230 if (!tt) 4231 return false; 4232 4233 ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA; 4234 4235 batadv_tt_global_entry_put(tt); 4236 4237 return ret; 4238 } 4239 4240 /** 4241 * batadv_tt_cache_init() - Initialize tt memory object cache 4242 * 4243 * Return: 0 on success or negative error number in case of failure. 4244 */ 4245 int __init batadv_tt_cache_init(void) 4246 { 4247 size_t tl_size = sizeof(struct batadv_tt_local_entry); 4248 size_t tg_size = sizeof(struct batadv_tt_global_entry); 4249 size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry); 4250 size_t tt_change_size = sizeof(struct batadv_tt_change_node); 4251 size_t tt_req_size = sizeof(struct batadv_tt_req_node); 4252 size_t tt_roam_size = sizeof(struct batadv_tt_roam_node); 4253 4254 batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0, 4255 SLAB_HWCACHE_ALIGN, NULL); 4256 if (!batadv_tl_cache) 4257 return -ENOMEM; 4258 4259 batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0, 4260 SLAB_HWCACHE_ALIGN, NULL); 4261 if (!batadv_tg_cache) 4262 goto err_tt_tl_destroy; 4263 4264 batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache", 4265 tt_orig_size, 0, 4266 SLAB_HWCACHE_ALIGN, NULL); 4267 if (!batadv_tt_orig_cache) 4268 goto err_tt_tg_destroy; 4269 4270 batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache", 4271 tt_change_size, 0, 4272 SLAB_HWCACHE_ALIGN, NULL); 4273 if (!batadv_tt_change_cache) 4274 goto err_tt_orig_destroy; 4275 4276 batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache", 4277 tt_req_size, 0, 4278 SLAB_HWCACHE_ALIGN, NULL); 4279 if (!batadv_tt_req_cache) 4280 goto err_tt_change_destroy; 4281 4282 batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache", 4283 tt_roam_size, 0, 4284 SLAB_HWCACHE_ALIGN, NULL); 4285 if (!batadv_tt_roam_cache) 4286 goto err_tt_req_destroy; 4287 4288 return 0; 4289 4290 err_tt_req_destroy: 4291 kmem_cache_destroy(batadv_tt_req_cache); 4292 batadv_tt_req_cache = NULL; 4293 err_tt_change_destroy: 4294 kmem_cache_destroy(batadv_tt_change_cache); 4295 batadv_tt_change_cache = NULL; 4296 err_tt_orig_destroy: 4297 kmem_cache_destroy(batadv_tt_orig_cache); 4298 batadv_tt_orig_cache = NULL; 4299 err_tt_tg_destroy: 4300 kmem_cache_destroy(batadv_tg_cache); 4301 batadv_tg_cache = NULL; 4302 err_tt_tl_destroy: 4303 kmem_cache_destroy(batadv_tl_cache); 4304 batadv_tl_cache = NULL; 4305 4306 return -ENOMEM; 4307 } 4308 4309 /** 4310 * batadv_tt_cache_destroy() - Destroy tt memory object cache 4311 */ 4312 void batadv_tt_cache_destroy(void) 4313 { 4314 kmem_cache_destroy(batadv_tl_cache); 4315 kmem_cache_destroy(batadv_tg_cache); 4316 kmem_cache_destroy(batadv_tt_orig_cache); 4317 kmem_cache_destroy(batadv_tt_change_cache); 4318 kmem_cache_destroy(batadv_tt_req_cache); 4319 kmem_cache_destroy(batadv_tt_roam_cache); 4320 } 4321