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 } 291 292 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl) 293 { 294 /* Use last four bytes of hw addr and interface index as hash index */ 295 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd) 296 & tbl->hash_mask; 297 } 298 299 struct mesh_table *mesh_table_alloc(int size_order) 300 { 301 int i; 302 struct mesh_table *newtbl; 303 304 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL); 305 if (!newtbl) 306 return NULL; 307 308 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) * 309 (1 << size_order), GFP_KERNEL); 310 311 if (!newtbl->hash_buckets) { 312 kfree(newtbl); 313 return NULL; 314 } 315 316 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) * 317 (1 << size_order), GFP_KERNEL); 318 if (!newtbl->hashwlock) { 319 kfree(newtbl->hash_buckets); 320 kfree(newtbl); 321 return NULL; 322 } 323 324 newtbl->size_order = size_order; 325 newtbl->hash_mask = (1 << size_order) - 1; 326 atomic_set(&newtbl->entries, 0); 327 get_random_bytes(&newtbl->hash_rnd, 328 sizeof(newtbl->hash_rnd)); 329 for (i = 0; i <= newtbl->hash_mask; i++) 330 spin_lock_init(&newtbl->hashwlock[i]); 331 332 return newtbl; 333 } 334 335 336 static void ieee80211_mesh_path_timer(unsigned long data) 337 { 338 struct ieee80211_sub_if_data *sdata = 339 (struct ieee80211_sub_if_data *) data; 340 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 341 struct ieee80211_local *local = sdata->local; 342 343 if (local->quiescing) { 344 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running); 345 return; 346 } 347 348 ieee80211_queue_work(&local->hw, &ifmsh->work); 349 } 350 351 static void ieee80211_mesh_path_root_timer(unsigned long data) 352 { 353 struct ieee80211_sub_if_data *sdata = 354 (struct ieee80211_sub_if_data *) data; 355 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 356 struct ieee80211_local *local = sdata->local; 357 358 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 359 360 if (local->quiescing) { 361 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running); 362 return; 363 } 364 365 ieee80211_queue_work(&local->hw, &ifmsh->work); 366 } 367 368 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh) 369 { 370 if (ifmsh->mshcfg.dot11MeshHWMPRootMode) 371 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 372 else { 373 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 374 /* stop running timer */ 375 del_timer_sync(&ifmsh->mesh_path_root_timer); 376 } 377 } 378 379 /** 380 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame 381 * @hdr: 802.11 frame header 382 * @fc: frame control field 383 * @meshda: destination address in the mesh 384 * @meshsa: source address address in the mesh. Same as TA, as frame is 385 * locally originated. 386 * 387 * Return the length of the 802.11 (does not include a mesh control header) 388 */ 389 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 390 const u8 *meshda, const u8 *meshsa) 391 { 392 if (is_multicast_ether_addr(meshda)) { 393 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 394 /* DA TA SA */ 395 memcpy(hdr->addr1, meshda, ETH_ALEN); 396 memcpy(hdr->addr2, meshsa, ETH_ALEN); 397 memcpy(hdr->addr3, meshsa, ETH_ALEN); 398 return 24; 399 } else { 400 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 401 IEEE80211_FCTL_TODS); 402 /* RA TA DA SA */ 403 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */ 404 memcpy(hdr->addr2, meshsa, ETH_ALEN); 405 memcpy(hdr->addr3, meshda, ETH_ALEN); 406 memcpy(hdr->addr4, meshsa, ETH_ALEN); 407 return 30; 408 } 409 } 410 411 /** 412 * ieee80211_new_mesh_header - create a new mesh header 413 * @meshhdr: uninitialized mesh header 414 * @sdata: mesh interface to be used 415 * @addr4: addr4 of the mesh frame (1st in ae header) 416 * may be NULL 417 * @addr5: addr5 of the mesh frame (1st or 2nd in ae header) 418 * may be NULL unless addr6 is present 419 * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header) 420 * may be NULL unless addr5 is present 421 * 422 * Return the header length. 423 */ 424 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr, 425 struct ieee80211_sub_if_data *sdata, char *addr4, 426 char *addr5, char *addr6) 427 { 428 int aelen = 0; 429 memset(meshhdr, 0, sizeof(*meshhdr)); 430 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; 431 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); 432 sdata->u.mesh.mesh_seqnum++; 433 if (addr4) { 434 meshhdr->flags |= MESH_FLAGS_AE_A4; 435 aelen += ETH_ALEN; 436 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN); 437 } 438 if (addr5 && addr6) { 439 meshhdr->flags |= MESH_FLAGS_AE_A5_A6; 440 aelen += 2 * ETH_ALEN; 441 if (!addr4) { 442 memcpy(meshhdr->eaddr1, addr5, ETH_ALEN); 443 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); 444 } else { 445 memcpy(meshhdr->eaddr2, addr5, ETH_ALEN); 446 memcpy(meshhdr->eaddr3, addr6, ETH_ALEN); 447 } 448 } 449 return 6 + aelen; 450 } 451 452 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata, 453 struct ieee80211_if_mesh *ifmsh) 454 { 455 bool free_plinks; 456 457 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 458 printk(KERN_DEBUG "%s: running mesh housekeeping\n", 459 sdata->name); 460 #endif 461 462 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT); 463 mesh_path_expire(sdata); 464 465 free_plinks = mesh_plink_availables(sdata); 466 if (free_plinks != sdata->u.mesh.accepting_plinks) 467 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); 468 469 mod_timer(&ifmsh->housekeeping_timer, 470 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); 471 } 472 473 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) 474 { 475 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 476 477 mesh_path_tx_root_frame(sdata); 478 mod_timer(&ifmsh->mesh_path_root_timer, 479 round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL)); 480 } 481 482 #ifdef CONFIG_PM 483 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata) 484 { 485 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 486 487 /* might restart the timer but that doesn't matter */ 488 cancel_work_sync(&ifmsh->work); 489 490 /* use atomic bitops in case both timers fire at the same time */ 491 492 if (del_timer_sync(&ifmsh->housekeeping_timer)) 493 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running); 494 if (del_timer_sync(&ifmsh->mesh_path_timer)) 495 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running); 496 if (del_timer_sync(&ifmsh->mesh_path_root_timer)) 497 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running); 498 } 499 500 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata) 501 { 502 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 503 504 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running)) 505 add_timer(&ifmsh->housekeeping_timer); 506 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running)) 507 add_timer(&ifmsh->mesh_path_timer); 508 if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running)) 509 add_timer(&ifmsh->mesh_path_root_timer); 510 ieee80211_mesh_root_setup(ifmsh); 511 } 512 #endif 513 514 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 515 { 516 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 517 struct ieee80211_local *local = sdata->local; 518 519 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 520 ieee80211_mesh_root_setup(ifmsh); 521 ieee80211_queue_work(&local->hw, &ifmsh->work); 522 sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL; 523 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON | 524 BSS_CHANGED_BEACON_ENABLED | 525 BSS_CHANGED_BEACON_INT); 526 } 527 528 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 529 { 530 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 531 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 532 /* 533 * If the timer fired while we waited for it, it will have 534 * requeued the work. Now the work will be running again 535 * but will not rearm the timer again because it checks 536 * whether the interface is running, which, at this point, 537 * it no longer is. 538 */ 539 cancel_work_sync(&sdata->u.mesh.work); 540 541 /* 542 * When we get here, the interface is marked down. 543 * Call synchronize_rcu() to wait for the RX path 544 * should it be using the interface and enqueuing 545 * frames at this very time on another CPU. 546 */ 547 rcu_barrier(); /* Wait for RX path and call_rcu()'s */ 548 skb_queue_purge(&sdata->u.mesh.skb_queue); 549 } 550 551 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 552 u16 stype, 553 struct ieee80211_mgmt *mgmt, 554 size_t len, 555 struct ieee80211_rx_status *rx_status) 556 { 557 struct ieee80211_local *local = sdata->local; 558 struct ieee802_11_elems elems; 559 struct ieee80211_channel *channel; 560 u32 supp_rates = 0; 561 size_t baselen; 562 int freq; 563 enum ieee80211_band band = rx_status->band; 564 565 /* ignore ProbeResp to foreign address */ 566 if (stype == IEEE80211_STYPE_PROBE_RESP && 567 compare_ether_addr(mgmt->da, sdata->vif.addr)) 568 return; 569 570 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 571 if (baselen > len) 572 return; 573 574 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 575 &elems); 576 577 if (elems.ds_params && elems.ds_params_len == 1) 578 freq = ieee80211_channel_to_frequency(elems.ds_params[0]); 579 else 580 freq = rx_status->freq; 581 582 channel = ieee80211_get_channel(local->hw.wiphy, freq); 583 584 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 585 return; 586 587 if (elems.mesh_id && elems.mesh_config && 588 mesh_matches_local(&elems, sdata)) { 589 supp_rates = ieee80211_sta_get_rates(local, &elems, band); 590 591 mesh_neighbour_update(mgmt->sa, supp_rates, sdata, 592 mesh_peer_accepts_plinks(&elems)); 593 } 594 } 595 596 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 597 struct ieee80211_mgmt *mgmt, 598 size_t len, 599 struct ieee80211_rx_status *rx_status) 600 { 601 switch (mgmt->u.action.category) { 602 case WLAN_CATEGORY_MESH_PLINK: 603 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 604 break; 605 case WLAN_CATEGORY_MESH_PATH_SEL: 606 mesh_rx_path_sel_frame(sdata, mgmt, len); 607 break; 608 } 609 } 610 611 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 612 struct sk_buff *skb) 613 { 614 struct ieee80211_rx_status *rx_status; 615 struct ieee80211_if_mesh *ifmsh; 616 struct ieee80211_mgmt *mgmt; 617 u16 stype; 618 619 ifmsh = &sdata->u.mesh; 620 621 rx_status = IEEE80211_SKB_RXCB(skb); 622 mgmt = (struct ieee80211_mgmt *) skb->data; 623 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 624 625 switch (stype) { 626 case IEEE80211_STYPE_PROBE_RESP: 627 case IEEE80211_STYPE_BEACON: 628 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 629 rx_status); 630 break; 631 case IEEE80211_STYPE_ACTION: 632 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 633 break; 634 } 635 636 kfree_skb(skb); 637 } 638 639 static void ieee80211_mesh_work(struct work_struct *work) 640 { 641 struct ieee80211_sub_if_data *sdata = 642 container_of(work, struct ieee80211_sub_if_data, u.mesh.work); 643 struct ieee80211_local *local = sdata->local; 644 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 645 struct sk_buff *skb; 646 647 if (!ieee80211_sdata_running(sdata)) 648 return; 649 650 if (local->scanning) 651 return; 652 653 while ((skb = skb_dequeue(&ifmsh->skb_queue))) 654 ieee80211_mesh_rx_queued_mgmt(sdata, skb); 655 656 if (ifmsh->preq_queue_len && 657 time_after(jiffies, 658 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 659 mesh_path_start_discovery(sdata); 660 661 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags)) 662 mesh_mpath_table_grow(); 663 664 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags)) 665 mesh_mpp_table_grow(); 666 667 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 668 ieee80211_mesh_housekeeping(sdata, ifmsh); 669 670 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 671 ieee80211_mesh_rootpath(sdata); 672 } 673 674 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) 675 { 676 struct ieee80211_sub_if_data *sdata; 677 678 rcu_read_lock(); 679 list_for_each_entry_rcu(sdata, &local->interfaces, list) 680 if (ieee80211_vif_is_mesh(&sdata->vif)) 681 ieee80211_queue_work(&local->hw, &sdata->u.mesh.work); 682 rcu_read_unlock(); 683 } 684 685 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 686 { 687 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 688 689 INIT_WORK(&ifmsh->work, ieee80211_mesh_work); 690 setup_timer(&ifmsh->housekeeping_timer, 691 ieee80211_mesh_housekeeping_timer, 692 (unsigned long) sdata); 693 skb_queue_head_init(&sdata->u.mesh.skb_queue); 694 695 ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T; 696 ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T; 697 ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T; 698 ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR; 699 ifmsh->mshcfg.dot11MeshTTL = MESH_TTL; 700 ifmsh->mshcfg.auto_open_plinks = true; 701 ifmsh->mshcfg.dot11MeshMaxPeerLinks = 702 MESH_MAX_ESTAB_PLINKS; 703 ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout = 704 MESH_PATH_TIMEOUT; 705 ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval = 706 MESH_PREQ_MIN_INT; 707 ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime = 708 MESH_DIAM_TRAVERSAL_TIME; 709 ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries = 710 MESH_MAX_PREQ_RETRIES; 711 ifmsh->mshcfg.path_refresh_time = 712 MESH_PATH_REFRESH_TIME; 713 ifmsh->mshcfg.min_discovery_timeout = 714 MESH_MIN_DISCOVERY_TIMEOUT; 715 ifmsh->accepting_plinks = true; 716 ifmsh->preq_id = 0; 717 ifmsh->sn = 0; 718 atomic_set(&ifmsh->mpaths, 0); 719 mesh_rmc_init(sdata); 720 ifmsh->last_preq = jiffies; 721 /* Allocate all mesh structures when creating the first mesh interface. */ 722 if (!mesh_allocated) 723 ieee80211s_init(); 724 mesh_ids_set_default(ifmsh); 725 setup_timer(&ifmsh->mesh_path_timer, 726 ieee80211_mesh_path_timer, 727 (unsigned long) sdata); 728 setup_timer(&ifmsh->mesh_path_root_timer, 729 ieee80211_mesh_path_root_timer, 730 (unsigned long) sdata); 731 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 732 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 733 } 734 735 ieee80211_rx_result 736 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 737 { 738 struct ieee80211_local *local = sdata->local; 739 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 740 struct ieee80211_mgmt *mgmt; 741 u16 fc; 742 743 if (skb->len < 24) 744 return RX_DROP_MONITOR; 745 746 mgmt = (struct ieee80211_mgmt *) skb->data; 747 fc = le16_to_cpu(mgmt->frame_control); 748 749 switch (fc & IEEE80211_FCTL_STYPE) { 750 case IEEE80211_STYPE_ACTION: 751 case IEEE80211_STYPE_PROBE_RESP: 752 case IEEE80211_STYPE_BEACON: 753 skb_queue_tail(&ifmsh->skb_queue, skb); 754 ieee80211_queue_work(&local->hw, &ifmsh->work); 755 return RX_QUEUED; 756 } 757 758 return RX_CONTINUE; 759 } 760