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