1 /* 2 * Copyright (c) 2008, 2009 open80211s Ltd. 3 * Authors: Luis Carlos Cobo <luisca@cozybit.com> 4 * Javier Cardona <javier@cozybit.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <linux/slab.h> 12 #include <asm/unaligned.h> 13 #include "ieee80211_i.h" 14 #include "mesh.h" 15 16 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ) 17 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ) 18 #define IEEE80211_MESH_RANN_INTERVAL (1 * HZ) 19 20 #define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01 21 #define MESHCONF_CAPAB_FORWARDING 0x08 22 23 #define TMR_RUNNING_HK 0 24 #define TMR_RUNNING_MP 1 25 #define TMR_RUNNING_MPR 2 26 27 int mesh_allocated; 28 static struct kmem_cache *rm_cache; 29 30 void ieee80211s_init(void) 31 { 32 mesh_pathtbl_init(); 33 mesh_allocated = 1; 34 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry), 35 0, 0, NULL); 36 } 37 38 void ieee80211s_stop(void) 39 { 40 mesh_pathtbl_unregister(); 41 kmem_cache_destroy(rm_cache); 42 } 43 44 static void ieee80211_mesh_housekeeping_timer(unsigned long data) 45 { 46 struct ieee80211_sub_if_data *sdata = (void *) data; 47 struct ieee80211_local *local = sdata->local; 48 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 49 50 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 51 52 if (local->quiescing) { 53 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running); 54 return; 55 } 56 57 ieee80211_queue_work(&local->hw, &ifmsh->work); 58 } 59 60 /** 61 * mesh_matches_local - check if the config of a mesh point matches ours 62 * 63 * @ie: information elements of a management frame from the mesh peer 64 * @sdata: local mesh subif 65 * 66 * This function checks if the mesh configuration of a mesh point matches the 67 * local mesh configuration, i.e. if both nodes belong to the same mesh network. 68 */ 69 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata) 70 { 71 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 72 73 /* 74 * As support for each feature is added, check for matching 75 * - On mesh config capabilities 76 * - Power Save Support En 77 * - Sync support enabled 78 * - Sync support active 79 * - Sync support required from peer 80 * - MDA enabled 81 * - Power management control on fc 82 */ 83 if (ifmsh->mesh_id_len == ie->mesh_id_len && 84 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 && 85 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) && 86 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) && 87 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) && 88 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) && 89 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)) 90 return true; 91 92 return false; 93 } 94 95 /** 96 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links 97 * 98 * @ie: information elements of a management frame from the mesh peer 99 */ 100 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) 101 { 102 return (ie->mesh_config->meshconf_cap & 103 MESHCONF_CAPAB_ACCEPT_PLINKS) != 0; 104 } 105 106 /** 107 * mesh_accept_plinks_update: update accepting_plink in local mesh beacons 108 * 109 * @sdata: mesh interface in which mesh beacons are going to be updated 110 */ 111 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) 112 { 113 bool free_plinks; 114 115 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, 116 * the mesh interface might be able to establish plinks with peers that 117 * are already on the table but are not on PLINK_ESTAB state. However, 118 * in general the mesh interface is not accepting peer link requests 119 * from new peers, and that must be reflected in the beacon 120 */ 121 free_plinks = mesh_plink_availables(sdata); 122 123 if (free_plinks != sdata->u.mesh.accepting_plinks) 124 ieee80211_mesh_housekeeping_timer((unsigned long) sdata); 125 } 126 127 void mesh_ids_set_default(struct ieee80211_if_mesh *sta) 128 { 129 sta->mesh_pp_id = 0; /* HWMP */ 130 sta->mesh_pm_id = 0; /* Airtime */ 131 sta->mesh_cc_id = 0; /* Disabled */ 132 sta->mesh_sp_id = 0; /* Neighbor Offset */ 133 sta->mesh_auth_id = 0; /* Disabled */ 134 } 135 136 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) 137 { 138 int i; 139 140 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); 141 if (!sdata->u.mesh.rmc) 142 return -ENOMEM; 143 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; 144 for (i = 0; i < RMC_BUCKETS; i++) 145 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list); 146 return 0; 147 } 148 149 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) 150 { 151 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 152 struct rmc_entry *p, *n; 153 int i; 154 155 if (!sdata->u.mesh.rmc) 156 return; 157 158 for (i = 0; i < RMC_BUCKETS; i++) 159 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) { 160 list_del(&p->list); 161 kmem_cache_free(rm_cache, p); 162 } 163 164 kfree(rmc); 165 sdata->u.mesh.rmc = NULL; 166 } 167 168 /** 169 * mesh_rmc_check - Check frame in recent multicast cache and add if absent. 170 * 171 * @sa: source address 172 * @mesh_hdr: mesh_header 173 * 174 * Returns: 0 if the frame is not in the cache, nonzero otherwise. 175 * 176 * Checks using the source address and the mesh sequence number if we have 177 * received this frame lately. If the frame is not in the cache, it is added to 178 * it. 179 */ 180 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr, 181 struct ieee80211_sub_if_data *sdata) 182 { 183 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 184 u32 seqnum = 0; 185 int entries = 0; 186 u8 idx; 187 struct rmc_entry *p, *n; 188 189 /* Don't care about endianness since only match matters */ 190 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); 191 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; 192 list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) { 193 ++entries; 194 if (time_after(jiffies, p->exp_time) || 195 (entries == RMC_QUEUE_MAX_LEN)) { 196 list_del(&p->list); 197 kmem_cache_free(rm_cache, p); 198 --entries; 199 } else if ((seqnum == p->seqnum) && 200 (memcmp(sa, p->sa, ETH_ALEN) == 0)) 201 return -1; 202 } 203 204 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); 205 if (!p) { 206 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n"); 207 return 0; 208 } 209 p->seqnum = seqnum; 210 p->exp_time = jiffies + RMC_TIMEOUT; 211 memcpy(p->sa, sa, ETH_ALEN); 212 list_add(&p->list, &rmc->bucket[idx].list); 213 return 0; 214 } 215 216 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) 217 { 218 struct ieee80211_local *local = sdata->local; 219 struct ieee80211_supported_band *sband; 220 u8 *pos; 221 int len, i, rate; 222 u8 neighbors; 223 224 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 225 len = sband->n_bitrates; 226 if (len > 8) 227 len = 8; 228 pos = skb_put(skb, len + 2); 229 *pos++ = WLAN_EID_SUPP_RATES; 230 *pos++ = len; 231 for (i = 0; i < len; i++) { 232 rate = sband->bitrates[i].bitrate; 233 *pos++ = (u8) (rate / 5); 234 } 235 236 if (sband->n_bitrates > len) { 237 pos = skb_put(skb, sband->n_bitrates - len + 2); 238 *pos++ = WLAN_EID_EXT_SUPP_RATES; 239 *pos++ = sband->n_bitrates - len; 240 for (i = len; i < sband->n_bitrates; i++) { 241 rate = sband->bitrates[i].bitrate; 242 *pos++ = (u8) (rate / 5); 243 } 244 } 245 246 if (sband->band == IEEE80211_BAND_2GHZ) { 247 pos = skb_put(skb, 2 + 1); 248 *pos++ = WLAN_EID_DS_PARAMS; 249 *pos++ = 1; 250 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq); 251 } 252 253 pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len); 254 *pos++ = WLAN_EID_MESH_ID; 255 *pos++ = sdata->u.mesh.mesh_id_len; 256 if (sdata->u.mesh.mesh_id_len) 257 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len); 258 259 pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie)); 260 *pos++ = WLAN_EID_MESH_CONFIG; 261 *pos++ = sizeof(struct ieee80211_meshconf_ie); 262 263 /* Active path selection protocol ID */ 264 *pos++ = sdata->u.mesh.mesh_pp_id; 265 266 /* Active path selection metric ID */ 267 *pos++ = sdata->u.mesh.mesh_pm_id; 268 269 /* Congestion control mode identifier */ 270 *pos++ = sdata->u.mesh.mesh_cc_id; 271 272 /* Synchronization protocol identifier */ 273 *pos++ = sdata->u.mesh.mesh_sp_id; 274 275 /* Authentication Protocol identifier */ 276 *pos++ = sdata->u.mesh.mesh_auth_id; 277 278 /* Mesh Formation Info - number of neighbors */ 279 neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks); 280 /* Number of neighbor mesh STAs or 15 whichever is smaller */ 281 neighbors = (neighbors > 15) ? 15 : neighbors; 282 *pos++ = neighbors << 1; 283 284 /* Mesh capability */ 285 sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata); 286 *pos = MESHCONF_CAPAB_FORWARDING; 287 *pos++ |= sdata->u.mesh.accepting_plinks ? 288 MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; 289 *pos++ = 0x00; 290 291 return; 292 } 293 294 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl) 295 { 296 /* Use last four bytes of hw addr and interface index as hash index */ 297 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd) 298 & tbl->hash_mask; 299 } 300 301 struct mesh_table *mesh_table_alloc(int size_order) 302 { 303 int i; 304 struct mesh_table *newtbl; 305 306 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL); 307 if (!newtbl) 308 return NULL; 309 310 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) * 311 (1 << size_order), GFP_KERNEL); 312 313 if (!newtbl->hash_buckets) { 314 kfree(newtbl); 315 return NULL; 316 } 317 318 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) * 319 (1 << size_order), GFP_KERNEL); 320 if (!newtbl->hashwlock) { 321 kfree(newtbl->hash_buckets); 322 kfree(newtbl); 323 return NULL; 324 } 325 326 newtbl->size_order = size_order; 327 newtbl->hash_mask = (1 << size_order) - 1; 328 atomic_set(&newtbl->entries, 0); 329 get_random_bytes(&newtbl->hash_rnd, 330 sizeof(newtbl->hash_rnd)); 331 for (i = 0; i <= newtbl->hash_mask; i++) 332 spin_lock_init(&newtbl->hashwlock[i]); 333 334 return newtbl; 335 } 336 337 338 static void ieee80211_mesh_path_timer(unsigned long data) 339 { 340 struct ieee80211_sub_if_data *sdata = 341 (struct ieee80211_sub_if_data *) data; 342 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 343 struct ieee80211_local *local = sdata->local; 344 345 if (local->quiescing) { 346 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running); 347 return; 348 } 349 350 ieee80211_queue_work(&local->hw, &ifmsh->work); 351 } 352 353 static void ieee80211_mesh_path_root_timer(unsigned long data) 354 { 355 struct ieee80211_sub_if_data *sdata = 356 (struct ieee80211_sub_if_data *) data; 357 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 358 struct ieee80211_local *local = sdata->local; 359 360 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 361 362 if (local->quiescing) { 363 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running); 364 return; 365 } 366 367 ieee80211_queue_work(&local->hw, &ifmsh->work); 368 } 369 370 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh) 371 { 372 if (ifmsh->mshcfg.dot11MeshHWMPRootMode) 373 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 374 else { 375 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 376 /* stop running timer */ 377 del_timer_sync(&ifmsh->mesh_path_root_timer); 378 } 379 } 380 381 /** 382 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame 383 * @hdr: 802.11 frame header 384 * @fc: frame control field 385 * @meshda: destination address in the mesh 386 * @meshsa: source address address in the mesh. Same as TA, as frame is 387 * locally originated. 388 * 389 * Return the length of the 802.11 (does not include a mesh control header) 390 */ 391 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 392 const u8 *meshda, const u8 *meshsa) 393 { 394 if (is_multicast_ether_addr(meshda)) { 395 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 396 /* DA TA SA */ 397 memcpy(hdr->addr1, meshda, ETH_ALEN); 398 memcpy(hdr->addr2, meshsa, ETH_ALEN); 399 memcpy(hdr->addr3, meshsa, ETH_ALEN); 400 return 24; 401 } else { 402 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 403 IEEE80211_FCTL_TODS); 404 /* RA TA DA SA */ 405 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */ 406 memcpy(hdr->addr2, meshsa, ETH_ALEN); 407 memcpy(hdr->addr3, meshda, ETH_ALEN); 408 memcpy(hdr->addr4, meshsa, ETH_ALEN); 409 return 30; 410 } 411 } 412 413 /** 414 * ieee80211_new_mesh_header - create a new mesh header 415 * @meshhdr: uninitialized mesh header 416 * @sdata: mesh interface to be used 417 * @addr4: addr4 of the mesh frame (1st in ae header) 418 * may be NULL 419 * @addr5: addr5 of the mesh frame (1st or 2nd in ae header) 420 * may be NULL unless addr6 is present 421 * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header) 422 * may be NULL unless addr5 is present 423 * 424 * Return the header length. 425 */ 426 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr, 427 struct ieee80211_sub_if_data *sdata, char *addr4, 428 char *addr5, char *addr6) 429 { 430 int aelen = 0; 431 memset(meshhdr, 0, sizeof(*meshhdr)); 432 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; 433 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); 434 sdata->u.mesh.mesh_seqnum++; 435 if (addr4) { 436 meshhdr->flags |= MESH_FLAGS_AE_A4; 437 aelen += ETH_ALEN; 438 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN); 439 } 440 if (addr5 && addr6) { 441 meshhdr->flags |= MESH_FLAGS_AE_A5_A6; 442 aelen += 2 * ETH_ALEN; 443 if (!addr4) { 444 memcpy(meshhdr->eaddr1, addr5, ETH_ALEN); 445 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); 446 } else { 447 memcpy(meshhdr->eaddr2, addr5, ETH_ALEN); 448 memcpy(meshhdr->eaddr3, addr6, ETH_ALEN); 449 } 450 } 451 return 6 + aelen; 452 } 453 454 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata, 455 struct ieee80211_if_mesh *ifmsh) 456 { 457 bool free_plinks; 458 459 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 460 printk(KERN_DEBUG "%s: running mesh housekeeping\n", 461 sdata->name); 462 #endif 463 464 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT); 465 mesh_path_expire(sdata); 466 467 free_plinks = mesh_plink_availables(sdata); 468 if (free_plinks != sdata->u.mesh.accepting_plinks) 469 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); 470 471 mod_timer(&ifmsh->housekeeping_timer, 472 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); 473 } 474 475 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) 476 { 477 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 478 479 mesh_path_tx_root_frame(sdata); 480 mod_timer(&ifmsh->mesh_path_root_timer, 481 round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL)); 482 } 483 484 #ifdef CONFIG_PM 485 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata) 486 { 487 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 488 489 /* might restart the timer but that doesn't matter */ 490 cancel_work_sync(&ifmsh->work); 491 492 /* use atomic bitops in case both timers fire at the same time */ 493 494 if (del_timer_sync(&ifmsh->housekeeping_timer)) 495 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running); 496 if (del_timer_sync(&ifmsh->mesh_path_timer)) 497 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running); 498 if (del_timer_sync(&ifmsh->mesh_path_root_timer)) 499 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running); 500 } 501 502 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata) 503 { 504 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 505 506 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running)) 507 add_timer(&ifmsh->housekeeping_timer); 508 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running)) 509 add_timer(&ifmsh->mesh_path_timer); 510 if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running)) 511 add_timer(&ifmsh->mesh_path_root_timer); 512 ieee80211_mesh_root_setup(ifmsh); 513 } 514 #endif 515 516 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 517 { 518 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 519 struct ieee80211_local *local = sdata->local; 520 521 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 522 ieee80211_mesh_root_setup(ifmsh); 523 ieee80211_queue_work(&local->hw, &ifmsh->work); 524 sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL; 525 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON | 526 BSS_CHANGED_BEACON_ENABLED | 527 BSS_CHANGED_BEACON_INT); 528 } 529 530 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 531 { 532 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 533 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 534 /* 535 * If the timer fired while we waited for it, it will have 536 * requeued the work. Now the work will be running again 537 * but will not rearm the timer again because it checks 538 * whether the interface is running, which, at this point, 539 * it no longer is. 540 */ 541 cancel_work_sync(&sdata->u.mesh.work); 542 543 /* 544 * When we get here, the interface is marked down. 545 * Call synchronize_rcu() to wait for the RX path 546 * should it be using the interface and enqueuing 547 * frames at this very time on another CPU. 548 */ 549 rcu_barrier(); /* Wait for RX path and call_rcu()'s */ 550 skb_queue_purge(&sdata->u.mesh.skb_queue); 551 } 552 553 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 554 u16 stype, 555 struct ieee80211_mgmt *mgmt, 556 size_t len, 557 struct ieee80211_rx_status *rx_status) 558 { 559 struct ieee80211_local *local = sdata->local; 560 struct ieee802_11_elems elems; 561 struct ieee80211_channel *channel; 562 u32 supp_rates = 0; 563 size_t baselen; 564 int freq; 565 enum ieee80211_band band = rx_status->band; 566 567 /* ignore ProbeResp to foreign address */ 568 if (stype == IEEE80211_STYPE_PROBE_RESP && 569 compare_ether_addr(mgmt->da, sdata->vif.addr)) 570 return; 571 572 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 573 if (baselen > len) 574 return; 575 576 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 577 &elems); 578 579 if (elems.ds_params && elems.ds_params_len == 1) 580 freq = ieee80211_channel_to_frequency(elems.ds_params[0]); 581 else 582 freq = rx_status->freq; 583 584 channel = ieee80211_get_channel(local->hw.wiphy, freq); 585 586 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 587 return; 588 589 if (elems.mesh_id && elems.mesh_config && 590 mesh_matches_local(&elems, sdata)) { 591 supp_rates = ieee80211_sta_get_rates(local, &elems, band); 592 593 mesh_neighbour_update(mgmt->sa, supp_rates, sdata, 594 mesh_peer_accepts_plinks(&elems)); 595 } 596 } 597 598 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 599 struct ieee80211_mgmt *mgmt, 600 size_t len, 601 struct ieee80211_rx_status *rx_status) 602 { 603 switch (mgmt->u.action.category) { 604 case MESH_PLINK_CATEGORY: 605 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 606 break; 607 case MESH_PATH_SEL_CATEGORY: 608 mesh_rx_path_sel_frame(sdata, mgmt, len); 609 break; 610 } 611 } 612 613 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 614 struct sk_buff *skb) 615 { 616 struct ieee80211_rx_status *rx_status; 617 struct ieee80211_if_mesh *ifmsh; 618 struct ieee80211_mgmt *mgmt; 619 u16 stype; 620 621 ifmsh = &sdata->u.mesh; 622 623 rx_status = IEEE80211_SKB_RXCB(skb); 624 mgmt = (struct ieee80211_mgmt *) skb->data; 625 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 626 627 switch (stype) { 628 case IEEE80211_STYPE_PROBE_RESP: 629 case IEEE80211_STYPE_BEACON: 630 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 631 rx_status); 632 break; 633 case IEEE80211_STYPE_ACTION: 634 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 635 break; 636 } 637 638 kfree_skb(skb); 639 } 640 641 static void ieee80211_mesh_work(struct work_struct *work) 642 { 643 struct ieee80211_sub_if_data *sdata = 644 container_of(work, struct ieee80211_sub_if_data, u.mesh.work); 645 struct ieee80211_local *local = sdata->local; 646 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 647 struct sk_buff *skb; 648 649 if (!ieee80211_sdata_running(sdata)) 650 return; 651 652 if (local->scanning) 653 return; 654 655 while ((skb = skb_dequeue(&ifmsh->skb_queue))) 656 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 657 658 if (ifmsh->preq_queue_len && 659 time_after(jiffies, 660 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 661 mesh_path_start_discovery(sdata); 662 663 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags)) 664 mesh_mpath_table_grow(); 665 666 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags)) 667 mesh_mpp_table_grow(); 668 669 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 670 ieee80211_mesh_housekeeping(sdata, ifmsh); 671 672 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 673 ieee80211_mesh_rootpath(sdata); 674 } 675 676 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) 677 { 678 struct ieee80211_sub_if_data *sdata; 679 680 rcu_read_lock(); 681 list_for_each_entry_rcu(sdata, &local->interfaces, list) 682 if (ieee80211_vif_is_mesh(&sdata->vif)) 683 ieee80211_queue_work(&local->hw, &sdata->u.mesh.work); 684 rcu_read_unlock(); 685 } 686 687 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 688 { 689 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 690 691 INIT_WORK(&ifmsh->work, ieee80211_mesh_work); 692 setup_timer(&ifmsh->housekeeping_timer, 693 ieee80211_mesh_housekeeping_timer, 694 (unsigned long) sdata); 695 skb_queue_head_init(&sdata->u.mesh.skb_queue); 696 697 ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T; 698 ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T; 699 ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T; 700 ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR; 701 ifmsh->mshcfg.dot11MeshTTL = MESH_TTL; 702 ifmsh->mshcfg.auto_open_plinks = true; 703 ifmsh->mshcfg.dot11MeshMaxPeerLinks = 704 MESH_MAX_ESTAB_PLINKS; 705 ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout = 706 MESH_PATH_TIMEOUT; 707 ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval = 708 MESH_PREQ_MIN_INT; 709 ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime = 710 MESH_DIAM_TRAVERSAL_TIME; 711 ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries = 712 MESH_MAX_PREQ_RETRIES; 713 ifmsh->mshcfg.path_refresh_time = 714 MESH_PATH_REFRESH_TIME; 715 ifmsh->mshcfg.min_discovery_timeout = 716 MESH_MIN_DISCOVERY_TIMEOUT; 717 ifmsh->accepting_plinks = true; 718 ifmsh->preq_id = 0; 719 ifmsh->sn = 0; 720 atomic_set(&ifmsh->mpaths, 0); 721 mesh_rmc_init(sdata); 722 ifmsh->last_preq = jiffies; 723 /* Allocate all mesh structures when creating the first mesh interface. */ 724 if (!mesh_allocated) 725 ieee80211s_init(); 726 mesh_ids_set_default(ifmsh); 727 setup_timer(&ifmsh->mesh_path_timer, 728 ieee80211_mesh_path_timer, 729 (unsigned long) sdata); 730 setup_timer(&ifmsh->mesh_path_root_timer, 731 ieee80211_mesh_path_root_timer, 732 (unsigned long) sdata); 733 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 734 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 735 } 736 737 ieee80211_rx_result 738 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 739 { 740 struct ieee80211_local *local = sdata->local; 741 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 742 struct ieee80211_mgmt *mgmt; 743 u16 fc; 744 745 if (skb->len < 24) 746 return RX_DROP_MONITOR; 747 748 mgmt = (struct ieee80211_mgmt *) skb->data; 749 fc = le16_to_cpu(mgmt->frame_control); 750 751 switch (fc & IEEE80211_FCTL_STYPE) { 752 case IEEE80211_STYPE_ACTION: 753 if (skb->len < IEEE80211_MIN_ACTION_SIZE) 754 return RX_DROP_MONITOR; 755 /* fall through */ 756 case IEEE80211_STYPE_PROBE_RESP: 757 case IEEE80211_STYPE_BEACON: 758 skb_queue_tail(&ifmsh->skb_queue, skb); 759 ieee80211_queue_work(&local->hw, &ifmsh->work); 760 return RX_QUEUED; 761 } 762 763 return RX_CONTINUE; 764 } 765