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#include "driver-ops.h" 16 17static int mesh_allocated; 18static struct kmem_cache *rm_cache; 19 20bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt) 21{ 22 return (mgmt->u.action.u.mesh_action.action_code == 23 WLAN_MESH_ACTION_HWMP_PATH_SELECTION); 24} 25 26void ieee80211s_init(void) 27{ 28 mesh_pathtbl_init(); 29 mesh_allocated = 1; 30 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry), 31 0, 0, NULL); 32} 33 34void ieee80211s_stop(void) 35{ 36 if (!mesh_allocated) 37 return; 38 mesh_pathtbl_unregister(); 39 kmem_cache_destroy(rm_cache); 40} 41 42static void ieee80211_mesh_housekeeping_timer(unsigned long data) 43{ 44 struct ieee80211_sub_if_data *sdata = (void *) data; 45 struct ieee80211_local *local = sdata->local; 46 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 47 48 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 49 50 ieee80211_queue_work(&local->hw, &sdata->work); 51} 52 53/** 54 * mesh_matches_local - check if the config of a mesh point matches ours 55 * 56 * @sdata: local mesh subif 57 * @ie: information elements of a management frame from the mesh peer 58 * 59 * This function checks if the mesh configuration of a mesh point matches the 60 * local mesh configuration, i.e. if both nodes belong to the same mesh network. 61 */ 62bool mesh_matches_local(struct ieee80211_sub_if_data *sdata, 63 struct ieee802_11_elems *ie) 64{ 65 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 66 u32 basic_rates = 0; 67 struct cfg80211_chan_def sta_chan_def; 68 69 /* 70 * As support for each feature is added, check for matching 71 * - On mesh config capabilities 72 * - Power Save Support En 73 * - Sync support enabled 74 * - Sync support active 75 * - Sync support required from peer 76 * - MDA enabled 77 * - Power management control on fc 78 */ 79 if (!(ifmsh->mesh_id_len == ie->mesh_id_len && 80 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 && 81 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) && 82 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) && 83 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) && 84 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) && 85 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))) 86 return false; 87 88 ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata), 89 &basic_rates); 90 91 if (sdata->vif.bss_conf.basic_rates != basic_rates) 92 return false; 93 94 ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan, 95 ie->ht_operation, &sta_chan_def); 96 97 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef, 98 &sta_chan_def)) 99 return false; 100 101 return true; 102} 103 104/** 105 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links 106 * 107 * @ie: information elements of a management frame from the mesh peer 108 */ 109bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) 110{ 111 return (ie->mesh_config->meshconf_cap & 112 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0; 113} 114 115/** 116 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons 117 * 118 * @sdata: mesh interface in which mesh beacons are going to be updated 119 * 120 * Returns: beacon changed flag if the beacon content changed. 121 */ 122u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) 123{ 124 bool free_plinks; 125 u32 changed = 0; 126 127 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, 128 * the mesh interface might be able to establish plinks with peers that 129 * are already on the table but are not on PLINK_ESTAB state. However, 130 * in general the mesh interface is not accepting peer link requests 131 * from new peers, and that must be reflected in the beacon 132 */ 133 free_plinks = mesh_plink_availables(sdata); 134 135 if (free_plinks != sdata->u.mesh.accepting_plinks) { 136 sdata->u.mesh.accepting_plinks = free_plinks; 137 changed = BSS_CHANGED_BEACON; 138 } 139 140 return changed; 141} 142 143/* 144 * mesh_sta_cleanup - clean up any mesh sta state 145 * 146 * @sta: mesh sta to clean up. 147 */ 148void mesh_sta_cleanup(struct sta_info *sta) 149{ 150 struct ieee80211_sub_if_data *sdata = sta->sdata; 151 u32 changed; 152 153 /* 154 * maybe userspace handles peer allocation and peering, but in either 155 * case the beacon is still generated by the kernel and we might need 156 * an update. 157 */ 158 changed = mesh_accept_plinks_update(sdata); 159 if (!sdata->u.mesh.user_mpm) { 160 changed |= mesh_plink_deactivate(sta); 161 del_timer_sync(&sta->plink_timer); 162 } 163 164 if (changed) 165 ieee80211_mbss_info_change_notify(sdata, changed); 166} 167 168int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) 169{ 170 int i; 171 172 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); 173 if (!sdata->u.mesh.rmc) 174 return -ENOMEM; 175 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; 176 for (i = 0; i < RMC_BUCKETS; i++) 177 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]); 178 return 0; 179} 180 181void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) 182{ 183 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 184 struct rmc_entry *p, *n; 185 int i; 186 187 if (!sdata->u.mesh.rmc) 188 return; 189 190 for (i = 0; i < RMC_BUCKETS; i++) { 191 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) { 192 list_del(&p->list); 193 kmem_cache_free(rm_cache, p); 194 } 195 } 196 197 kfree(rmc); 198 sdata->u.mesh.rmc = NULL; 199} 200 201/** 202 * mesh_rmc_check - Check frame in recent multicast cache and add if absent. 203 * 204 * @sdata: interface 205 * @sa: source address 206 * @mesh_hdr: mesh_header 207 * 208 * Returns: 0 if the frame is not in the cache, nonzero otherwise. 209 * 210 * Checks using the source address and the mesh sequence number if we have 211 * received this frame lately. If the frame is not in the cache, it is added to 212 * it. 213 */ 214int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 215 const u8 *sa, struct ieee80211s_hdr *mesh_hdr) 216{ 217 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 218 u32 seqnum = 0; 219 int entries = 0; 220 u8 idx; 221 struct rmc_entry *p, *n; 222 223 /* Don't care about endianness since only match matters */ 224 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); 225 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; 226 list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) { 227 ++entries; 228 if (time_after(jiffies, p->exp_time) || 229 entries == RMC_QUEUE_MAX_LEN) { 230 list_del(&p->list); 231 kmem_cache_free(rm_cache, p); 232 --entries; 233 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa)) 234 return -1; 235 } 236 237 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); 238 if (!p) 239 return 0; 240 241 p->seqnum = seqnum; 242 p->exp_time = jiffies + RMC_TIMEOUT; 243 memcpy(p->sa, sa, ETH_ALEN); 244 list_add(&p->list, &rmc->bucket[idx]); 245 return 0; 246} 247 248int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 249 struct sk_buff *skb) 250{ 251 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 252 u8 *pos, neighbors; 253 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie); 254 255 if (skb_tailroom(skb) < 2 + meshconf_len) 256 return -ENOMEM; 257 258 pos = skb_put(skb, 2 + meshconf_len); 259 *pos++ = WLAN_EID_MESH_CONFIG; 260 *pos++ = meshconf_len; 261 262 /* save a pointer for quick updates in pre-tbtt */ 263 ifmsh->meshconf_offset = pos - skb->data; 264 265 /* Active path selection protocol ID */ 266 *pos++ = ifmsh->mesh_pp_id; 267 /* Active path selection metric ID */ 268 *pos++ = ifmsh->mesh_pm_id; 269 /* Congestion control mode identifier */ 270 *pos++ = ifmsh->mesh_cc_id; 271 /* Synchronization protocol identifier */ 272 *pos++ = ifmsh->mesh_sp_id; 273 /* Authentication Protocol identifier */ 274 *pos++ = ifmsh->mesh_auth_id; 275 /* Mesh Formation Info - number of neighbors */ 276 neighbors = atomic_read(&ifmsh->estab_plinks); 277 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS); 278 *pos++ = neighbors << 1; 279 /* Mesh capability */ 280 *pos = 0x00; 281 *pos |= ifmsh->mshcfg.dot11MeshForwarding ? 282 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00; 283 *pos |= ifmsh->accepting_plinks ? 284 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; 285 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */ 286 *pos |= ifmsh->ps_peers_deep_sleep ? 287 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00; 288 *pos++ |= ifmsh->adjusting_tbtt ? 289 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00; 290 *pos++ = 0x00; 291 292 return 0; 293} 294 295int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 296{ 297 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 298 u8 *pos; 299 300 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len) 301 return -ENOMEM; 302 303 pos = skb_put(skb, 2 + ifmsh->mesh_id_len); 304 *pos++ = WLAN_EID_MESH_ID; 305 *pos++ = ifmsh->mesh_id_len; 306 if (ifmsh->mesh_id_len) 307 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len); 308 309 return 0; 310} 311 312static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata, 313 struct sk_buff *skb) 314{ 315 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 316 u8 *pos; 317 318 /* see IEEE802.11-2012 13.14.6 */ 319 if (ifmsh->ps_peers_light_sleep == 0 && 320 ifmsh->ps_peers_deep_sleep == 0 && 321 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE) 322 return 0; 323 324 if (skb_tailroom(skb) < 4) 325 return -ENOMEM; 326 327 pos = skb_put(skb, 2 + 2); 328 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW; 329 *pos++ = 2; 330 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos); 331 332 return 0; 333} 334 335int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 336 struct sk_buff *skb) 337{ 338 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 339 u8 offset, len; 340 const u8 *data; 341 342 if (!ifmsh->ie || !ifmsh->ie_len) 343 return 0; 344 345 /* fast-forward to vendor IEs */ 346 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0); 347 348 if (offset) { 349 len = ifmsh->ie_len - offset; 350 data = ifmsh->ie + offset; 351 if (skb_tailroom(skb) < len) 352 return -ENOMEM; 353 memcpy(skb_put(skb, len), data, len); 354 } 355 356 return 0; 357} 358 359int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 360{ 361 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 362 u8 len = 0; 363 const u8 *data; 364 365 if (!ifmsh->ie || !ifmsh->ie_len) 366 return 0; 367 368 /* find RSN IE */ 369 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len); 370 if (!data) 371 return 0; 372 373 len = data[1] + 2; 374 375 if (skb_tailroom(skb) < len) 376 return -ENOMEM; 377 memcpy(skb_put(skb, len), data, len); 378 379 return 0; 380} 381 382static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata, 383 struct sk_buff *skb) 384{ 385 struct ieee80211_chanctx_conf *chanctx_conf; 386 struct ieee80211_channel *chan; 387 u8 *pos; 388 389 if (skb_tailroom(skb) < 3) 390 return -ENOMEM; 391 392 rcu_read_lock(); 393 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 394 if (WARN_ON(!chanctx_conf)) { 395 rcu_read_unlock(); 396 return -EINVAL; 397 } 398 chan = chanctx_conf->def.chan; 399 rcu_read_unlock(); 400 401 pos = skb_put(skb, 2 + 1); 402 *pos++ = WLAN_EID_DS_PARAMS; 403 *pos++ = 1; 404 *pos++ = ieee80211_frequency_to_channel(chan->center_freq); 405 406 return 0; 407} 408 409int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 410 struct sk_buff *skb) 411{ 412 struct ieee80211_local *local = sdata->local; 413 enum ieee80211_band band = ieee80211_get_sdata_band(sdata); 414 struct ieee80211_supported_band *sband; 415 u8 *pos; 416 417 sband = local->hw.wiphy->bands[band]; 418 if (!sband->ht_cap.ht_supported || 419 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 420 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 421 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 422 return 0; 423 424 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap)) 425 return -ENOMEM; 426 427 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap)); 428 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap); 429 430 return 0; 431} 432 433int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 434 struct sk_buff *skb) 435{ 436 struct ieee80211_local *local = sdata->local; 437 struct ieee80211_chanctx_conf *chanctx_conf; 438 struct ieee80211_channel *channel; 439 enum nl80211_channel_type channel_type = 440 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef); 441 struct ieee80211_supported_band *sband; 442 struct ieee80211_sta_ht_cap *ht_cap; 443 u8 *pos; 444 445 rcu_read_lock(); 446 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 447 if (WARN_ON(!chanctx_conf)) { 448 rcu_read_unlock(); 449 return -EINVAL; 450 } 451 channel = chanctx_conf->def.chan; 452 rcu_read_unlock(); 453 454 sband = local->hw.wiphy->bands[channel->band]; 455 ht_cap = &sband->ht_cap; 456 457 if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT) 458 return 0; 459 460 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation)) 461 return -ENOMEM; 462 463 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 464 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef, 465 sdata->vif.bss_conf.ht_operation_mode); 466 467 return 0; 468} 469 470static void ieee80211_mesh_path_timer(unsigned long data) 471{ 472 struct ieee80211_sub_if_data *sdata = 473 (struct ieee80211_sub_if_data *) data; 474 475 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 476} 477 478static void ieee80211_mesh_path_root_timer(unsigned long data) 479{ 480 struct ieee80211_sub_if_data *sdata = 481 (struct ieee80211_sub_if_data *) data; 482 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 483 484 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 485 486 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 487} 488 489void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh) 490{ 491 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT) 492 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 493 else { 494 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 495 /* stop running timer */ 496 del_timer_sync(&ifmsh->mesh_path_root_timer); 497 } 498} 499 500/** 501 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame 502 * @hdr: 802.11 frame header 503 * @fc: frame control field 504 * @meshda: destination address in the mesh 505 * @meshsa: source address address in the mesh. Same as TA, as frame is 506 * locally originated. 507 * 508 * Return the length of the 802.11 (does not include a mesh control header) 509 */ 510int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 511 const u8 *meshda, const u8 *meshsa) 512{ 513 if (is_multicast_ether_addr(meshda)) { 514 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 515 /* DA TA SA */ 516 memcpy(hdr->addr1, meshda, ETH_ALEN); 517 memcpy(hdr->addr2, meshsa, ETH_ALEN); 518 memcpy(hdr->addr3, meshsa, ETH_ALEN); 519 return 24; 520 } else { 521 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 522 /* RA TA DA SA */ 523 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */ 524 memcpy(hdr->addr2, meshsa, ETH_ALEN); 525 memcpy(hdr->addr3, meshda, ETH_ALEN); 526 memcpy(hdr->addr4, meshsa, ETH_ALEN); 527 return 30; 528 } 529} 530 531/** 532 * ieee80211_new_mesh_header - create a new mesh header 533 * @sdata: mesh interface to be used 534 * @meshhdr: uninitialized mesh header 535 * @addr4or5: 1st address in the ae header, which may correspond to address 4 536 * (if addr6 is NULL) or address 5 (if addr6 is present). It may 537 * be NULL. 538 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the 539 * mesh frame 540 * 541 * Return the header length. 542 */ 543int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 544 struct ieee80211s_hdr *meshhdr, 545 const char *addr4or5, const char *addr6) 546{ 547 if (WARN_ON(!addr4or5 && addr6)) 548 return 0; 549 550 memset(meshhdr, 0, sizeof(*meshhdr)); 551 552 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; 553 554 /* FIXME: racy -- TX on multiple queues can be concurrent */ 555 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); 556 sdata->u.mesh.mesh_seqnum++; 557 558 if (addr4or5 && !addr6) { 559 meshhdr->flags |= MESH_FLAGS_AE_A4; 560 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 561 return 2 * ETH_ALEN; 562 } else if (addr4or5 && addr6) { 563 meshhdr->flags |= MESH_FLAGS_AE_A5_A6; 564 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 565 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); 566 return 3 * ETH_ALEN; 567 } 568 569 return ETH_ALEN; 570} 571 572static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata) 573{ 574 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 575 u32 changed; 576 577 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ); 578 mesh_path_expire(sdata); 579 580 changed = mesh_accept_plinks_update(sdata); 581 ieee80211_mbss_info_change_notify(sdata, changed); 582 583 mod_timer(&ifmsh->housekeeping_timer, 584 round_jiffies(jiffies + 585 IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); 586} 587 588static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) 589{ 590 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 591 u32 interval; 592 593 mesh_path_tx_root_frame(sdata); 594 595 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN) 596 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; 597 else 598 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval; 599 600 mod_timer(&ifmsh->mesh_path_root_timer, 601 round_jiffies(TU_TO_EXP_TIME(interval))); 602} 603 604static int 605ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh) 606{ 607 struct beacon_data *bcn; 608 int head_len, tail_len; 609 struct sk_buff *skb; 610 struct ieee80211_mgmt *mgmt; 611 struct ieee80211_chanctx_conf *chanctx_conf; 612 struct mesh_csa_settings *csa; 613 enum ieee80211_band band; 614 u8 *pos; 615 struct ieee80211_sub_if_data *sdata; 616 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 617 sizeof(mgmt->u.beacon); 618 619 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh); 620 rcu_read_lock(); 621 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 622 band = chanctx_conf->def.chan->band; 623 rcu_read_unlock(); 624 625 head_len = hdr_len + 626 2 + /* NULL SSID */ 627 /* Channel Switch Announcement */ 628 2 + sizeof(struct ieee80211_channel_sw_ie) + 629 /* Mesh Channel Swith Parameters */ 630 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) + 631 2 + 8 + /* supported rates */ 632 2 + 3; /* DS params */ 633 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 634 2 + sizeof(struct ieee80211_ht_cap) + 635 2 + sizeof(struct ieee80211_ht_operation) + 636 2 + ifmsh->mesh_id_len + 637 2 + sizeof(struct ieee80211_meshconf_ie) + 638 2 + sizeof(__le16) + /* awake window */ 639 ifmsh->ie_len; 640 641 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL); 642 /* need an skb for IE builders to operate on */ 643 skb = dev_alloc_skb(max(head_len, tail_len)); 644 645 if (!bcn || !skb) 646 goto out_free; 647 648 /* 649 * pointers go into the block we allocated, 650 * memory is | beacon_data | head | tail | 651 */ 652 bcn->head = ((u8 *) bcn) + sizeof(*bcn); 653 654 /* fill in the head */ 655 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 656 memset(mgmt, 0, hdr_len); 657 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 658 IEEE80211_STYPE_BEACON); 659 eth_broadcast_addr(mgmt->da); 660 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 661 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 662 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt); 663 mgmt->u.beacon.beacon_int = 664 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 665 mgmt->u.beacon.capab_info |= cpu_to_le16( 666 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 667 668 pos = skb_put(skb, 2); 669 *pos++ = WLAN_EID_SSID; 670 *pos++ = 0x0; 671 672 rcu_read_lock(); 673 csa = rcu_dereference(ifmsh->csa); 674 if (csa) { 675 pos = skb_put(skb, 13); 676 memset(pos, 0, 13); 677 *pos++ = WLAN_EID_CHANNEL_SWITCH; 678 *pos++ = 3; 679 *pos++ = 0x0; 680 *pos++ = ieee80211_frequency_to_channel( 681 csa->settings.chandef.chan->center_freq); 682 bcn->csa_counter_offsets[0] = hdr_len + 6; 683 *pos++ = csa->settings.count; 684 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; 685 *pos++ = 6; 686 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) { 687 *pos++ = ifmsh->mshcfg.dot11MeshTTL; 688 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 689 } else { 690 *pos++ = ifmsh->chsw_ttl; 691 } 692 *pos++ |= csa->settings.block_tx ? 693 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00; 694 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); 695 pos += 2; 696 put_unaligned_le16(ifmsh->pre_value, pos); 697 pos += 2; 698 } 699 rcu_read_unlock(); 700 701 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 702 mesh_add_ds_params_ie(sdata, skb)) 703 goto out_free; 704 705 bcn->head_len = skb->len; 706 memcpy(bcn->head, skb->data, bcn->head_len); 707 708 /* now the tail */ 709 skb_trim(skb, 0); 710 bcn->tail = bcn->head + bcn->head_len; 711 712 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 713 mesh_add_rsn_ie(sdata, skb) || 714 mesh_add_ht_cap_ie(sdata, skb) || 715 mesh_add_ht_oper_ie(sdata, skb) || 716 mesh_add_meshid_ie(sdata, skb) || 717 mesh_add_meshconf_ie(sdata, skb) || 718 mesh_add_awake_window_ie(sdata, skb) || 719 mesh_add_vendor_ies(sdata, skb)) 720 goto out_free; 721 722 bcn->tail_len = skb->len; 723 memcpy(bcn->tail, skb->data, bcn->tail_len); 724 bcn->meshconf = (struct ieee80211_meshconf_ie *) 725 (bcn->tail + ifmsh->meshconf_offset); 726 727 dev_kfree_skb(skb); 728 rcu_assign_pointer(ifmsh->beacon, bcn); 729 return 0; 730out_free: 731 kfree(bcn); 732 dev_kfree_skb(skb); 733 return -ENOMEM; 734} 735 736static int 737ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata) 738{ 739 struct beacon_data *old_bcn; 740 int ret; 741 742 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon, 743 lockdep_is_held(&sdata->wdev.mtx)); 744 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh); 745 if (ret) 746 /* just reuse old beacon */ 747 return ret; 748 749 if (old_bcn) 750 kfree_rcu(old_bcn, rcu_head); 751 return 0; 752} 753 754void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 755 u32 changed) 756{ 757 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 758 unsigned long bits = changed; 759 u32 bit; 760 761 if (!bits) 762 return; 763 764 /* if we race with running work, worst case this work becomes a noop */ 765 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE) 766 set_bit(bit, &ifmsh->mbss_changed); 767 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags); 768 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 769} 770 771int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 772{ 773 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 774 struct ieee80211_local *local = sdata->local; 775 u32 changed = BSS_CHANGED_BEACON | 776 BSS_CHANGED_BEACON_ENABLED | 777 BSS_CHANGED_HT | 778 BSS_CHANGED_BASIC_RATES | 779 BSS_CHANGED_BEACON_INT; 780 781 local->fif_other_bss++; 782 /* mesh ifaces must set allmulti to forward mcast traffic */ 783 atomic_inc(&local->iff_allmultis); 784 ieee80211_configure_filter(local); 785 786 ifmsh->mesh_cc_id = 0; /* Disabled */ 787 /* register sync ops from extensible synchronization framework */ 788 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id); 789 ifmsh->adjusting_tbtt = false; 790 ifmsh->sync_offset_clockdrift_max = 0; 791 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 792 ieee80211_mesh_root_setup(ifmsh); 793 ieee80211_queue_work(&local->hw, &sdata->work); 794 sdata->vif.bss_conf.ht_operation_mode = 795 ifmsh->mshcfg.ht_opmode; 796 sdata->vif.bss_conf.enable_beacon = true; 797 798 changed |= ieee80211_mps_local_status_update(sdata); 799 800 if (ieee80211_mesh_build_beacon(ifmsh)) { 801 ieee80211_stop_mesh(sdata); 802 return -ENOMEM; 803 } 804 805 ieee80211_recalc_dtim(local, sdata); 806 ieee80211_bss_info_change_notify(sdata, changed); 807 808 netif_carrier_on(sdata->dev); 809 return 0; 810} 811 812void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 813{ 814 struct ieee80211_local *local = sdata->local; 815 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 816 struct beacon_data *bcn; 817 818 netif_carrier_off(sdata->dev); 819 820 /* stop the beacon */ 821 ifmsh->mesh_id_len = 0; 822 sdata->vif.bss_conf.enable_beacon = false; 823 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 824 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); 825 bcn = rcu_dereference_protected(ifmsh->beacon, 826 lockdep_is_held(&sdata->wdev.mtx)); 827 RCU_INIT_POINTER(ifmsh->beacon, NULL); 828 kfree_rcu(bcn, rcu_head); 829 830 /* flush STAs and mpaths on this iface */ 831 sta_info_flush(sdata); 832 mesh_path_flush_by_iface(sdata); 833 834 /* free all potentially still buffered group-addressed frames */ 835 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf); 836 skb_queue_purge(&ifmsh->ps.bc_buf); 837 838 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 839 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 840 del_timer_sync(&sdata->u.mesh.mesh_path_timer); 841 842 /* clear any mesh work (for next join) we may have accrued */ 843 ifmsh->wrkq_flags = 0; 844 ifmsh->mbss_changed = 0; 845 846 local->fif_other_bss--; 847 atomic_dec(&local->iff_allmultis); 848 ieee80211_configure_filter(local); 849} 850 851static bool 852ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata, 853 struct ieee802_11_elems *elems, bool beacon) 854{ 855 struct cfg80211_csa_settings params; 856 struct ieee80211_csa_ie csa_ie; 857 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 858 enum ieee80211_band band = ieee80211_get_sdata_band(sdata); 859 int err; 860 u32 sta_flags; 861 862 sdata_assert_lock(sdata); 863 864 sta_flags = IEEE80211_STA_DISABLE_VHT; 865 switch (sdata->vif.bss_conf.chandef.width) { 866 case NL80211_CHAN_WIDTH_20_NOHT: 867 sta_flags |= IEEE80211_STA_DISABLE_HT; 868 case NL80211_CHAN_WIDTH_20: 869 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 870 break; 871 default: 872 break; 873 } 874 875 memset(¶ms, 0, sizeof(params)); 876 memset(&csa_ie, 0, sizeof(csa_ie)); 877 err = ieee80211_parse_ch_switch_ie(sdata, elems, band, 878 sta_flags, sdata->vif.addr, 879 &csa_ie); 880 if (err < 0) 881 return false; 882 if (err) 883 return false; 884 885 params.chandef = csa_ie.chandef; 886 params.count = csa_ie.count; 887 888 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, 889 IEEE80211_CHAN_DISABLED)) { 890 sdata_info(sdata, 891 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 892 sdata->vif.addr, 893 params.chandef.chan->center_freq, 894 params.chandef.width, 895 params.chandef.center_freq1, 896 params.chandef.center_freq2); 897 return false; 898 } 899 900 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 901 ¶ms.chandef, 902 NL80211_IFTYPE_MESH_POINT); 903 if (err < 0) 904 return false; 905 if (err > 0) 906 /* TODO: DFS not (yet) supported */ 907 return false; 908 909 params.radar_required = err; 910 911 if (cfg80211_chandef_identical(¶ms.chandef, 912 &sdata->vif.bss_conf.chandef)) { 913 mcsa_dbg(sdata, 914 "received csa with an identical chandef, ignoring\n"); 915 return true; 916 } 917 918 mcsa_dbg(sdata, 919 "received channel switch announcement to go to channel %d MHz\n", 920 params.chandef.chan->center_freq); 921 922 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT; 923 if (beacon) { 924 ifmsh->chsw_ttl = csa_ie.ttl - 1; 925 if (ifmsh->pre_value >= csa_ie.pre_value) 926 return false; 927 ifmsh->pre_value = csa_ie.pre_value; 928 } 929 930 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) 931 return false; 932 933 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; 934 935 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 936 ¶ms) < 0) 937 return false; 938 939 return true; 940} 941 942static void 943ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, 944 struct ieee80211_mgmt *mgmt, size_t len) 945{ 946 struct ieee80211_local *local = sdata->local; 947 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 948 struct sk_buff *presp; 949 struct beacon_data *bcn; 950 struct ieee80211_mgmt *hdr; 951 struct ieee802_11_elems elems; 952 size_t baselen; 953 u8 *pos; 954 955 pos = mgmt->u.probe_req.variable; 956 baselen = (u8 *) pos - (u8 *) mgmt; 957 if (baselen > len) 958 return; 959 960 ieee802_11_parse_elems(pos, len - baselen, false, &elems); 961 962 if (!elems.mesh_id) 963 return; 964 965 /* 802.11-2012 10.1.4.3.2 */ 966 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && 967 !is_broadcast_ether_addr(mgmt->da)) || 968 elems.ssid_len != 0) 969 return; 970 971 if (elems.mesh_id_len != 0 && 972 (elems.mesh_id_len != ifmsh->mesh_id_len || 973 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) 974 return; 975 976 rcu_read_lock(); 977 bcn = rcu_dereference(ifmsh->beacon); 978 979 if (!bcn) 980 goto out; 981 982 presp = dev_alloc_skb(local->tx_headroom + 983 bcn->head_len + bcn->tail_len); 984 if (!presp) 985 goto out; 986 987 skb_reserve(presp, local->tx_headroom); 988 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len); 989 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len); 990 hdr = (struct ieee80211_mgmt *) presp->data; 991 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 992 IEEE80211_STYPE_PROBE_RESP); 993 memcpy(hdr->da, mgmt->sa, ETH_ALEN); 994 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 995 ieee80211_tx_skb(sdata, presp); 996out: 997 rcu_read_unlock(); 998} 999 1000static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 1001 u16 stype, 1002 struct ieee80211_mgmt *mgmt, 1003 size_t len, 1004 struct ieee80211_rx_status *rx_status) 1005{ 1006 struct ieee80211_local *local = sdata->local; 1007 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1008 struct ieee802_11_elems elems; 1009 struct ieee80211_channel *channel; 1010 size_t baselen; 1011 int freq; 1012 enum ieee80211_band band = rx_status->band; 1013 1014 /* ignore ProbeResp to foreign address */ 1015 if (stype == IEEE80211_STYPE_PROBE_RESP && 1016 !ether_addr_equal(mgmt->da, sdata->vif.addr)) 1017 return; 1018 1019 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1020 if (baselen > len) 1021 return; 1022 1023 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1024 false, &elems); 1025 1026 /* ignore non-mesh or secure / unsecure mismatch */ 1027 if ((!elems.mesh_id || !elems.mesh_config) || 1028 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) || 1029 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)) 1030 return; 1031 1032 if (elems.ds_params) 1033 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band); 1034 else 1035 freq = rx_status->freq; 1036 1037 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1038 1039 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1040 return; 1041 1042 if (mesh_matches_local(sdata, &elems)) 1043 mesh_neighbour_update(sdata, mgmt->sa, &elems); 1044 1045 if (ifmsh->sync_ops) 1046 ifmsh->sync_ops->rx_bcn_presp(sdata, 1047 stype, mgmt, &elems, rx_status); 1048 1049 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && 1050 !sdata->vif.csa_active) 1051 ieee80211_mesh_process_chnswitch(sdata, &elems, true); 1052} 1053 1054int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata) 1055{ 1056 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1057 struct mesh_csa_settings *tmp_csa_settings; 1058 int ret = 0; 1059 int changed = 0; 1060 1061 /* Reset the TTL value and Initiator flag */ 1062 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1063 ifmsh->chsw_ttl = 0; 1064 1065 /* Remove the CSA and MCSP elements from the beacon */ 1066 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1067 RCU_INIT_POINTER(ifmsh->csa, NULL); 1068 if (tmp_csa_settings) 1069 kfree_rcu(tmp_csa_settings, rcu_head); 1070 ret = ieee80211_mesh_rebuild_beacon(sdata); 1071 if (ret) 1072 return -EINVAL; 1073 1074 changed |= BSS_CHANGED_BEACON; 1075 1076 mcsa_dbg(sdata, "complete switching to center freq %d MHz", 1077 sdata->vif.bss_conf.chandef.chan->center_freq); 1078 return changed; 1079} 1080 1081int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, 1082 struct cfg80211_csa_settings *csa_settings) 1083{ 1084 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1085 struct mesh_csa_settings *tmp_csa_settings; 1086 int ret = 0; 1087 1088 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings), 1089 GFP_ATOMIC); 1090 if (!tmp_csa_settings) 1091 return -ENOMEM; 1092 1093 memcpy(&tmp_csa_settings->settings, csa_settings, 1094 sizeof(struct cfg80211_csa_settings)); 1095 1096 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings); 1097 1098 ret = ieee80211_mesh_rebuild_beacon(sdata); 1099 if (ret) { 1100 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1101 RCU_INIT_POINTER(ifmsh->csa, NULL); 1102 kfree_rcu(tmp_csa_settings, rcu_head); 1103 return ret; 1104 } 1105 1106 return BSS_CHANGED_BEACON; 1107} 1108 1109static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata, 1110 struct ieee80211_mgmt *mgmt, size_t len) 1111{ 1112 struct ieee80211_mgmt *mgmt_fwd; 1113 struct sk_buff *skb; 1114 struct ieee80211_local *local = sdata->local; 1115 u8 *pos = mgmt->u.action.u.chan_switch.variable; 1116 size_t offset_ttl; 1117 1118 skb = dev_alloc_skb(local->tx_headroom + len); 1119 if (!skb) 1120 return -ENOMEM; 1121 skb_reserve(skb, local->tx_headroom); 1122 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len); 1123 1124 /* offset_ttl is based on whether the secondary channel 1125 * offset is available or not. Subtract 1 from the mesh TTL 1126 * and disable the initiator flag before forwarding. 1127 */ 1128 offset_ttl = (len < 42) ? 7 : 10; 1129 *(pos + offset_ttl) -= 1; 1130 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 1131 1132 memcpy(mgmt_fwd, mgmt, len); 1133 eth_broadcast_addr(mgmt_fwd->da); 1134 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN); 1135 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN); 1136 1137 ieee80211_tx_skb(sdata, skb); 1138 return 0; 1139} 1140 1141static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata, 1142 struct ieee80211_mgmt *mgmt, size_t len) 1143{ 1144 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1145 struct ieee802_11_elems elems; 1146 u16 pre_value; 1147 bool fwd_csa = true; 1148 size_t baselen; 1149 u8 *pos; 1150 1151 if (mgmt->u.action.u.measurement.action_code != 1152 WLAN_ACTION_SPCT_CHL_SWITCH) 1153 return; 1154 1155 pos = mgmt->u.action.u.chan_switch.variable; 1156 baselen = offsetof(struct ieee80211_mgmt, 1157 u.action.u.chan_switch.variable); 1158 ieee802_11_parse_elems(pos, len - baselen, false, &elems); 1159 1160 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl; 1161 if (!--ifmsh->chsw_ttl) 1162 fwd_csa = false; 1163 1164 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value); 1165 if (ifmsh->pre_value >= pre_value) 1166 return; 1167 1168 ifmsh->pre_value = pre_value; 1169 1170 if (!sdata->vif.csa_active && 1171 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) { 1172 mcsa_dbg(sdata, "Failed to process CSA action frame"); 1173 return; 1174 } 1175 1176 /* forward or re-broadcast the CSA frame */ 1177 if (fwd_csa) { 1178 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0) 1179 mcsa_dbg(sdata, "Failed to forward the CSA frame"); 1180 } 1181} 1182 1183static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 1184 struct ieee80211_mgmt *mgmt, 1185 size_t len, 1186 struct ieee80211_rx_status *rx_status) 1187{ 1188 switch (mgmt->u.action.category) { 1189 case WLAN_CATEGORY_SELF_PROTECTED: 1190 switch (mgmt->u.action.u.self_prot.action_code) { 1191 case WLAN_SP_MESH_PEERING_OPEN: 1192 case WLAN_SP_MESH_PEERING_CLOSE: 1193 case WLAN_SP_MESH_PEERING_CONFIRM: 1194 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 1195 break; 1196 } 1197 break; 1198 case WLAN_CATEGORY_MESH_ACTION: 1199 if (mesh_action_is_path_sel(mgmt)) 1200 mesh_rx_path_sel_frame(sdata, mgmt, len); 1201 break; 1202 case WLAN_CATEGORY_SPECTRUM_MGMT: 1203 mesh_rx_csa_frame(sdata, mgmt, len); 1204 break; 1205 } 1206} 1207 1208void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1209 struct sk_buff *skb) 1210{ 1211 struct ieee80211_rx_status *rx_status; 1212 struct ieee80211_mgmt *mgmt; 1213 u16 stype; 1214 1215 sdata_lock(sdata); 1216 1217 /* mesh already went down */ 1218 if (!sdata->u.mesh.mesh_id_len) 1219 goto out; 1220 1221 rx_status = IEEE80211_SKB_RXCB(skb); 1222 mgmt = (struct ieee80211_mgmt *) skb->data; 1223 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 1224 1225 switch (stype) { 1226 case IEEE80211_STYPE_PROBE_RESP: 1227 case IEEE80211_STYPE_BEACON: 1228 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 1229 rx_status); 1230 break; 1231 case IEEE80211_STYPE_PROBE_REQ: 1232 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); 1233 break; 1234 case IEEE80211_STYPE_ACTION: 1235 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 1236 break; 1237 } 1238out: 1239 sdata_unlock(sdata); 1240} 1241 1242static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) 1243{ 1244 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1245 u32 bit, changed = 0; 1246 1247 for_each_set_bit(bit, &ifmsh->mbss_changed, 1248 sizeof(changed) * BITS_PER_BYTE) { 1249 clear_bit(bit, &ifmsh->mbss_changed); 1250 changed |= BIT(bit); 1251 } 1252 1253 if (sdata->vif.bss_conf.enable_beacon && 1254 (changed & (BSS_CHANGED_BEACON | 1255 BSS_CHANGED_HT | 1256 BSS_CHANGED_BASIC_RATES | 1257 BSS_CHANGED_BEACON_INT))) 1258 if (ieee80211_mesh_rebuild_beacon(sdata)) 1259 return; 1260 1261 ieee80211_bss_info_change_notify(sdata, changed); 1262} 1263 1264void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 1265{ 1266 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1267 1268 sdata_lock(sdata); 1269 1270 /* mesh already went down */ 1271 if (!sdata->u.mesh.mesh_id_len) 1272 goto out; 1273 1274 if (ifmsh->preq_queue_len && 1275 time_after(jiffies, 1276 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 1277 mesh_path_start_discovery(sdata); 1278 1279 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags)) 1280 mesh_mpath_table_grow(); 1281 1282 if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags)) 1283 mesh_mpp_table_grow(); 1284 1285 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 1286 ieee80211_mesh_housekeeping(sdata); 1287 1288 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 1289 ieee80211_mesh_rootpath(sdata); 1290 1291 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags)) 1292 mesh_sync_adjust_tbtt(sdata); 1293 1294 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) 1295 mesh_bss_info_changed(sdata); 1296out: 1297 sdata_unlock(sdata); 1298} 1299 1300void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) 1301{ 1302 struct ieee80211_sub_if_data *sdata; 1303 1304 rcu_read_lock(); 1305 list_for_each_entry_rcu(sdata, &local->interfaces, list) 1306 if (ieee80211_vif_is_mesh(&sdata->vif) && 1307 ieee80211_sdata_running(sdata)) 1308 ieee80211_queue_work(&local->hw, &sdata->work); 1309 rcu_read_unlock(); 1310} 1311 1312void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 1313{ 1314 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1315 static u8 zero_addr[ETH_ALEN] = {}; 1316 1317 setup_timer(&ifmsh->housekeeping_timer, 1318 ieee80211_mesh_housekeeping_timer, 1319 (unsigned long) sdata); 1320 1321 ifmsh->accepting_plinks = true; 1322 atomic_set(&ifmsh->mpaths, 0); 1323 mesh_rmc_init(sdata); 1324 ifmsh->last_preq = jiffies; 1325 ifmsh->next_perr = jiffies; 1326 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1327 /* Allocate all mesh structures when creating the first mesh interface. */ 1328 if (!mesh_allocated) 1329 ieee80211s_init(); 1330 setup_timer(&ifmsh->mesh_path_timer, 1331 ieee80211_mesh_path_timer, 1332 (unsigned long) sdata); 1333 setup_timer(&ifmsh->mesh_path_root_timer, 1334 ieee80211_mesh_path_root_timer, 1335 (unsigned long) sdata); 1336 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 1337 skb_queue_head_init(&ifmsh->ps.bc_buf); 1338 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 1339 spin_lock_init(&ifmsh->sync_offset_lock); 1340 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1341 1342 sdata->vif.bss_conf.bssid = zero_addr; 1343} 1344