1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2008, 2009 open80211s Ltd. 4 * Copyright (C) 2018 - 2021 Intel Corporation 5 * Authors: Luis Carlos Cobo <luisca@cozybit.com> 6 * Javier Cardona <javier@cozybit.com> 7 */ 8 9 #include <linux/slab.h> 10 #include <asm/unaligned.h> 11 #include "ieee80211_i.h" 12 #include "mesh.h" 13 #include "driver-ops.h" 14 15 static int mesh_allocated; 16 static struct kmem_cache *rm_cache; 17 18 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt) 19 { 20 return (mgmt->u.action.u.mesh_action.action_code == 21 WLAN_MESH_ACTION_HWMP_PATH_SELECTION); 22 } 23 24 void ieee80211s_init(void) 25 { 26 mesh_allocated = 1; 27 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry), 28 0, 0, NULL); 29 } 30 31 void ieee80211s_stop(void) 32 { 33 if (!mesh_allocated) 34 return; 35 kmem_cache_destroy(rm_cache); 36 } 37 38 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t) 39 { 40 struct ieee80211_sub_if_data *sdata = 41 from_timer(sdata, t, u.mesh.housekeeping_timer); 42 struct ieee80211_local *local = sdata->local; 43 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 44 45 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 46 47 ieee80211_queue_work(&local->hw, &sdata->work); 48 } 49 50 /** 51 * mesh_matches_local - check if the config of a mesh point matches ours 52 * 53 * @sdata: local mesh subif 54 * @ie: information elements of a management frame from the mesh peer 55 * 56 * This function checks if the mesh configuration of a mesh point matches the 57 * local mesh configuration, i.e. if both nodes belong to the same mesh network. 58 */ 59 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata, 60 struct ieee802_11_elems *ie) 61 { 62 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 63 u32 basic_rates = 0; 64 struct cfg80211_chan_def sta_chan_def; 65 struct ieee80211_supported_band *sband; 66 u32 vht_cap_info = 0; 67 68 /* 69 * As support for each feature is added, check for matching 70 * - On mesh config capabilities 71 * - Power Save Support En 72 * - Sync support enabled 73 * - Sync support active 74 * - Sync support required from peer 75 * - MDA enabled 76 * - Power management control on fc 77 */ 78 if (!(ifmsh->mesh_id_len == ie->mesh_id_len && 79 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 && 80 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) && 81 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) && 82 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) && 83 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) && 84 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))) 85 return false; 86 87 sband = ieee80211_get_sband(sdata); 88 if (!sband) 89 return false; 90 91 ieee80211_sta_get_rates(sdata, ie, sband->band, 92 &basic_rates); 93 94 if (sdata->vif.bss_conf.basic_rates != basic_rates) 95 return false; 96 97 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan, 98 NL80211_CHAN_NO_HT); 99 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def); 100 101 if (ie->vht_cap_elem) 102 vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info); 103 104 ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info, 105 ie->vht_operation, ie->ht_operation, 106 &sta_chan_def); 107 ieee80211_chandef_he_6ghz_oper(sdata, ie->he_operation, NULL, 108 &sta_chan_def); 109 110 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef, 111 &sta_chan_def)) 112 return false; 113 114 return true; 115 } 116 117 /** 118 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links 119 * 120 * @ie: information elements of a management frame from the mesh peer 121 */ 122 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) 123 { 124 return (ie->mesh_config->meshconf_cap & 125 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0; 126 } 127 128 /** 129 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons 130 * 131 * @sdata: mesh interface in which mesh beacons are going to be updated 132 * 133 * Returns: beacon changed flag if the beacon content changed. 134 */ 135 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) 136 { 137 bool free_plinks; 138 u32 changed = 0; 139 140 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, 141 * the mesh interface might be able to establish plinks with peers that 142 * are already on the table but are not on PLINK_ESTAB state. However, 143 * in general the mesh interface is not accepting peer link requests 144 * from new peers, and that must be reflected in the beacon 145 */ 146 free_plinks = mesh_plink_availables(sdata); 147 148 if (free_plinks != sdata->u.mesh.accepting_plinks) { 149 sdata->u.mesh.accepting_plinks = free_plinks; 150 changed = BSS_CHANGED_BEACON; 151 } 152 153 return changed; 154 } 155 156 /* 157 * mesh_sta_cleanup - clean up any mesh sta state 158 * 159 * @sta: mesh sta to clean up. 160 */ 161 void mesh_sta_cleanup(struct sta_info *sta) 162 { 163 struct ieee80211_sub_if_data *sdata = sta->sdata; 164 u32 changed = mesh_plink_deactivate(sta); 165 166 if (changed) 167 ieee80211_mbss_info_change_notify(sdata, changed); 168 } 169 170 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) 171 { 172 int i; 173 174 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); 175 if (!sdata->u.mesh.rmc) 176 return -ENOMEM; 177 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; 178 for (i = 0; i < RMC_BUCKETS; i++) 179 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]); 180 return 0; 181 } 182 183 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) 184 { 185 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 186 struct rmc_entry *p; 187 struct hlist_node *n; 188 int i; 189 190 if (!sdata->u.mesh.rmc) 191 return; 192 193 for (i = 0; i < RMC_BUCKETS; i++) { 194 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) { 195 hlist_del(&p->list); 196 kmem_cache_free(rm_cache, p); 197 } 198 } 199 200 kfree(rmc); 201 sdata->u.mesh.rmc = NULL; 202 } 203 204 /** 205 * mesh_rmc_check - Check frame in recent multicast cache and add if absent. 206 * 207 * @sdata: interface 208 * @sa: source address 209 * @mesh_hdr: mesh_header 210 * 211 * Returns: 0 if the frame is not in the cache, nonzero otherwise. 212 * 213 * Checks using the source address and the mesh sequence number if we have 214 * received this frame lately. If the frame is not in the cache, it is added to 215 * it. 216 */ 217 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 218 const u8 *sa, struct ieee80211s_hdr *mesh_hdr) 219 { 220 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 221 u32 seqnum = 0; 222 int entries = 0; 223 u8 idx; 224 struct rmc_entry *p; 225 struct hlist_node *n; 226 227 if (!rmc) 228 return -1; 229 230 /* Don't care about endianness since only match matters */ 231 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); 232 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; 233 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) { 234 ++entries; 235 if (time_after(jiffies, p->exp_time) || 236 entries == RMC_QUEUE_MAX_LEN) { 237 hlist_del(&p->list); 238 kmem_cache_free(rm_cache, p); 239 --entries; 240 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa)) 241 return -1; 242 } 243 244 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); 245 if (!p) 246 return 0; 247 248 p->seqnum = seqnum; 249 p->exp_time = jiffies + RMC_TIMEOUT; 250 memcpy(p->sa, sa, ETH_ALEN); 251 hlist_add_head(&p->list, &rmc->bucket[idx]); 252 return 0; 253 } 254 255 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 256 struct sk_buff *skb) 257 { 258 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 259 u8 *pos, neighbors; 260 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie); 261 bool is_connected_to_gate = ifmsh->num_gates > 0 || 262 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol || 263 ifmsh->mshcfg.dot11MeshConnectedToMeshGate; 264 bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer; 265 266 if (skb_tailroom(skb) < 2 + meshconf_len) 267 return -ENOMEM; 268 269 pos = skb_put(skb, 2 + meshconf_len); 270 *pos++ = WLAN_EID_MESH_CONFIG; 271 *pos++ = meshconf_len; 272 273 /* save a pointer for quick updates in pre-tbtt */ 274 ifmsh->meshconf_offset = pos - skb->data; 275 276 /* Active path selection protocol ID */ 277 *pos++ = ifmsh->mesh_pp_id; 278 /* Active path selection metric ID */ 279 *pos++ = ifmsh->mesh_pm_id; 280 /* Congestion control mode identifier */ 281 *pos++ = ifmsh->mesh_cc_id; 282 /* Synchronization protocol identifier */ 283 *pos++ = ifmsh->mesh_sp_id; 284 /* Authentication Protocol identifier */ 285 *pos++ = ifmsh->mesh_auth_id; 286 /* Mesh Formation Info - number of neighbors */ 287 neighbors = atomic_read(&ifmsh->estab_plinks); 288 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS); 289 *pos++ = (is_connected_to_as << 7) | 290 (neighbors << 1) | 291 is_connected_to_gate; 292 /* Mesh capability */ 293 *pos = 0x00; 294 *pos |= ifmsh->mshcfg.dot11MeshForwarding ? 295 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00; 296 *pos |= ifmsh->accepting_plinks ? 297 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; 298 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */ 299 *pos |= ifmsh->ps_peers_deep_sleep ? 300 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00; 301 return 0; 302 } 303 304 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 305 { 306 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 307 u8 *pos; 308 309 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len) 310 return -ENOMEM; 311 312 pos = skb_put(skb, 2 + ifmsh->mesh_id_len); 313 *pos++ = WLAN_EID_MESH_ID; 314 *pos++ = ifmsh->mesh_id_len; 315 if (ifmsh->mesh_id_len) 316 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len); 317 318 return 0; 319 } 320 321 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata, 322 struct sk_buff *skb) 323 { 324 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 325 u8 *pos; 326 327 /* see IEEE802.11-2012 13.14.6 */ 328 if (ifmsh->ps_peers_light_sleep == 0 && 329 ifmsh->ps_peers_deep_sleep == 0 && 330 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE) 331 return 0; 332 333 if (skb_tailroom(skb) < 4) 334 return -ENOMEM; 335 336 pos = skb_put(skb, 2 + 2); 337 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW; 338 *pos++ = 2; 339 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos); 340 341 return 0; 342 } 343 344 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 345 struct sk_buff *skb) 346 { 347 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 348 u8 offset, len; 349 const u8 *data; 350 351 if (!ifmsh->ie || !ifmsh->ie_len) 352 return 0; 353 354 /* fast-forward to vendor IEs */ 355 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0); 356 357 if (offset < ifmsh->ie_len) { 358 len = ifmsh->ie_len - offset; 359 data = ifmsh->ie + offset; 360 if (skb_tailroom(skb) < len) 361 return -ENOMEM; 362 skb_put_data(skb, data, len); 363 } 364 365 return 0; 366 } 367 368 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 369 { 370 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 371 u8 len = 0; 372 const u8 *data; 373 374 if (!ifmsh->ie || !ifmsh->ie_len) 375 return 0; 376 377 /* find RSN IE */ 378 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len); 379 if (!data) 380 return 0; 381 382 len = data[1] + 2; 383 384 if (skb_tailroom(skb) < len) 385 return -ENOMEM; 386 skb_put_data(skb, data, len); 387 388 return 0; 389 } 390 391 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata, 392 struct sk_buff *skb) 393 { 394 struct ieee80211_chanctx_conf *chanctx_conf; 395 struct ieee80211_channel *chan; 396 u8 *pos; 397 398 if (skb_tailroom(skb) < 3) 399 return -ENOMEM; 400 401 rcu_read_lock(); 402 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 403 if (WARN_ON(!chanctx_conf)) { 404 rcu_read_unlock(); 405 return -EINVAL; 406 } 407 chan = chanctx_conf->def.chan; 408 rcu_read_unlock(); 409 410 pos = skb_put(skb, 2 + 1); 411 *pos++ = WLAN_EID_DS_PARAMS; 412 *pos++ = 1; 413 *pos++ = ieee80211_frequency_to_channel(chan->center_freq); 414 415 return 0; 416 } 417 418 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 419 struct sk_buff *skb) 420 { 421 struct ieee80211_supported_band *sband; 422 u8 *pos; 423 424 sband = ieee80211_get_sband(sdata); 425 if (!sband) 426 return -EINVAL; 427 428 /* HT not allowed in 6 GHz */ 429 if (sband->band == NL80211_BAND_6GHZ) 430 return 0; 431 432 if (!sband->ht_cap.ht_supported || 433 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 434 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 435 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 436 return 0; 437 438 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap)) 439 return -ENOMEM; 440 441 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap)); 442 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap); 443 444 return 0; 445 } 446 447 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 448 struct sk_buff *skb) 449 { 450 struct ieee80211_local *local = sdata->local; 451 struct ieee80211_chanctx_conf *chanctx_conf; 452 struct ieee80211_channel *channel; 453 struct ieee80211_supported_band *sband; 454 struct ieee80211_sta_ht_cap *ht_cap; 455 u8 *pos; 456 457 rcu_read_lock(); 458 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 459 if (WARN_ON(!chanctx_conf)) { 460 rcu_read_unlock(); 461 return -EINVAL; 462 } 463 channel = chanctx_conf->def.chan; 464 rcu_read_unlock(); 465 466 sband = local->hw.wiphy->bands[channel->band]; 467 ht_cap = &sband->ht_cap; 468 469 /* HT not allowed in 6 GHz */ 470 if (sband->band == NL80211_BAND_6GHZ) 471 return 0; 472 473 if (!ht_cap->ht_supported || 474 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 475 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 476 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 477 return 0; 478 479 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation)) 480 return -ENOMEM; 481 482 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 483 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef, 484 sdata->vif.bss_conf.ht_operation_mode, 485 false); 486 487 return 0; 488 } 489 490 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, 491 struct sk_buff *skb) 492 { 493 struct ieee80211_supported_band *sband; 494 u8 *pos; 495 496 sband = ieee80211_get_sband(sdata); 497 if (!sband) 498 return -EINVAL; 499 500 /* VHT not allowed in 6 GHz */ 501 if (sband->band == NL80211_BAND_6GHZ) 502 return 0; 503 504 if (!sband->vht_cap.vht_supported || 505 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 506 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 507 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 508 return 0; 509 510 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap)) 511 return -ENOMEM; 512 513 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap)); 514 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap); 515 516 return 0; 517 } 518 519 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, 520 struct sk_buff *skb) 521 { 522 struct ieee80211_local *local = sdata->local; 523 struct ieee80211_chanctx_conf *chanctx_conf; 524 struct ieee80211_channel *channel; 525 struct ieee80211_supported_band *sband; 526 struct ieee80211_sta_vht_cap *vht_cap; 527 u8 *pos; 528 529 rcu_read_lock(); 530 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 531 if (WARN_ON(!chanctx_conf)) { 532 rcu_read_unlock(); 533 return -EINVAL; 534 } 535 channel = chanctx_conf->def.chan; 536 rcu_read_unlock(); 537 538 sband = local->hw.wiphy->bands[channel->band]; 539 vht_cap = &sband->vht_cap; 540 541 /* VHT not allowed in 6 GHz */ 542 if (sband->band == NL80211_BAND_6GHZ) 543 return 0; 544 545 if (!vht_cap->vht_supported || 546 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 547 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 548 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 549 return 0; 550 551 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation)) 552 return -ENOMEM; 553 554 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 555 ieee80211_ie_build_vht_oper(pos, vht_cap, 556 &sdata->vif.bss_conf.chandef); 557 558 return 0; 559 } 560 561 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata, 562 struct sk_buff *skb, u8 ie_len) 563 { 564 const struct ieee80211_sta_he_cap *he_cap; 565 struct ieee80211_supported_band *sband; 566 u8 *pos; 567 568 sband = ieee80211_get_sband(sdata); 569 if (!sband) 570 return -EINVAL; 571 572 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT); 573 574 if (!he_cap || 575 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 576 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 577 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 578 return 0; 579 580 if (skb_tailroom(skb) < ie_len) 581 return -ENOMEM; 582 583 pos = skb_put(skb, ie_len); 584 ieee80211_ie_build_he_cap(0, pos, he_cap, pos + ie_len); 585 586 return 0; 587 } 588 589 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata, 590 struct sk_buff *skb) 591 { 592 const struct ieee80211_sta_he_cap *he_cap; 593 struct ieee80211_supported_band *sband; 594 u32 len; 595 u8 *pos; 596 597 sband = ieee80211_get_sband(sdata); 598 if (!sband) 599 return -EINVAL; 600 601 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT); 602 if (!he_cap || 603 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 604 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 605 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 606 return 0; 607 608 len = 2 + 1 + sizeof(struct ieee80211_he_operation); 609 if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ) 610 len += sizeof(struct ieee80211_he_6ghz_oper); 611 612 if (skb_tailroom(skb) < len) 613 return -ENOMEM; 614 615 pos = skb_put(skb, len); 616 ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef); 617 618 return 0; 619 } 620 621 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata, 622 struct sk_buff *skb) 623 { 624 struct ieee80211_supported_band *sband; 625 const struct ieee80211_sband_iftype_data *iftd; 626 627 sband = ieee80211_get_sband(sdata); 628 if (!sband) 629 return -EINVAL; 630 631 iftd = ieee80211_get_sband_iftype_data(sband, 632 NL80211_IFTYPE_MESH_POINT); 633 /* The device doesn't support HE in mesh mode or at all */ 634 if (!iftd) 635 return 0; 636 637 ieee80211_ie_build_he_6ghz_cap(sdata, skb); 638 return 0; 639 } 640 641 static void ieee80211_mesh_path_timer(struct timer_list *t) 642 { 643 struct ieee80211_sub_if_data *sdata = 644 from_timer(sdata, t, u.mesh.mesh_path_timer); 645 646 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 647 } 648 649 static void ieee80211_mesh_path_root_timer(struct timer_list *t) 650 { 651 struct ieee80211_sub_if_data *sdata = 652 from_timer(sdata, t, u.mesh.mesh_path_root_timer); 653 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 654 655 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 656 657 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 658 } 659 660 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh) 661 { 662 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT) 663 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 664 else { 665 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 666 /* stop running timer */ 667 del_timer_sync(&ifmsh->mesh_path_root_timer); 668 } 669 } 670 671 static void 672 ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata, 673 u8 *ie, u8 ie_len) 674 { 675 struct ieee80211_supported_band *sband; 676 const struct element *cap; 677 const struct ieee80211_he_operation *he_oper = NULL; 678 679 sband = ieee80211_get_sband(sdata); 680 if (!sband) 681 return; 682 683 if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) || 684 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 685 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 686 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 687 return; 688 689 sdata->vif.bss_conf.he_support = true; 690 691 cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len); 692 if (cap && cap->datalen >= 1 + sizeof(*he_oper) && 693 cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1)) 694 he_oper = (void *)(cap->data + 1); 695 696 if (he_oper) 697 sdata->vif.bss_conf.he_oper.params = 698 __le32_to_cpu(he_oper->he_oper_params); 699 } 700 701 /** 702 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame 703 * @hdr: 802.11 frame header 704 * @fc: frame control field 705 * @meshda: destination address in the mesh 706 * @meshsa: source address in the mesh. Same as TA, as frame is 707 * locally originated. 708 * 709 * Return the length of the 802.11 (does not include a mesh control header) 710 */ 711 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 712 const u8 *meshda, const u8 *meshsa) 713 { 714 if (is_multicast_ether_addr(meshda)) { 715 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 716 /* DA TA SA */ 717 memcpy(hdr->addr1, meshda, ETH_ALEN); 718 memcpy(hdr->addr2, meshsa, ETH_ALEN); 719 memcpy(hdr->addr3, meshsa, ETH_ALEN); 720 return 24; 721 } else { 722 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 723 /* RA TA DA SA */ 724 eth_zero_addr(hdr->addr1); /* RA is resolved later */ 725 memcpy(hdr->addr2, meshsa, ETH_ALEN); 726 memcpy(hdr->addr3, meshda, ETH_ALEN); 727 memcpy(hdr->addr4, meshsa, ETH_ALEN); 728 return 30; 729 } 730 } 731 732 /** 733 * ieee80211_new_mesh_header - create a new mesh header 734 * @sdata: mesh interface to be used 735 * @meshhdr: uninitialized mesh header 736 * @addr4or5: 1st address in the ae header, which may correspond to address 4 737 * (if addr6 is NULL) or address 5 (if addr6 is present). It may 738 * be NULL. 739 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the 740 * mesh frame 741 * 742 * Return the header length. 743 */ 744 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 745 struct ieee80211s_hdr *meshhdr, 746 const char *addr4or5, const char *addr6) 747 { 748 if (WARN_ON(!addr4or5 && addr6)) 749 return 0; 750 751 memset(meshhdr, 0, sizeof(*meshhdr)); 752 753 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; 754 755 /* FIXME: racy -- TX on multiple queues can be concurrent */ 756 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); 757 sdata->u.mesh.mesh_seqnum++; 758 759 if (addr4or5 && !addr6) { 760 meshhdr->flags |= MESH_FLAGS_AE_A4; 761 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 762 return 2 * ETH_ALEN; 763 } else if (addr4or5 && addr6) { 764 meshhdr->flags |= MESH_FLAGS_AE_A5_A6; 765 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 766 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); 767 return 3 * ETH_ALEN; 768 } 769 770 return ETH_ALEN; 771 } 772 773 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata) 774 { 775 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 776 u32 changed; 777 778 if (ifmsh->mshcfg.plink_timeout > 0) 779 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ); 780 mesh_path_expire(sdata); 781 782 changed = mesh_accept_plinks_update(sdata); 783 ieee80211_mbss_info_change_notify(sdata, changed); 784 785 mod_timer(&ifmsh->housekeeping_timer, 786 round_jiffies(jiffies + 787 IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); 788 } 789 790 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) 791 { 792 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 793 u32 interval; 794 795 mesh_path_tx_root_frame(sdata); 796 797 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN) 798 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; 799 else 800 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval; 801 802 mod_timer(&ifmsh->mesh_path_root_timer, 803 round_jiffies(TU_TO_EXP_TIME(interval))); 804 } 805 806 static int 807 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh) 808 { 809 struct beacon_data *bcn; 810 int head_len, tail_len; 811 struct sk_buff *skb; 812 struct ieee80211_mgmt *mgmt; 813 struct ieee80211_chanctx_conf *chanctx_conf; 814 struct mesh_csa_settings *csa; 815 enum nl80211_band band; 816 u8 ie_len_he_cap; 817 u8 *pos; 818 struct ieee80211_sub_if_data *sdata; 819 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon); 820 821 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh); 822 rcu_read_lock(); 823 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 824 band = chanctx_conf->def.chan->band; 825 rcu_read_unlock(); 826 827 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata, 828 NL80211_IFTYPE_MESH_POINT); 829 head_len = hdr_len + 830 2 + /* NULL SSID */ 831 /* Channel Switch Announcement */ 832 2 + sizeof(struct ieee80211_channel_sw_ie) + 833 /* Mesh Channel Switch Parameters */ 834 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) + 835 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */ 836 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) + 837 2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 838 2 + 8 + /* supported rates */ 839 2 + 3; /* DS params */ 840 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 841 2 + sizeof(struct ieee80211_ht_cap) + 842 2 + sizeof(struct ieee80211_ht_operation) + 843 2 + ifmsh->mesh_id_len + 844 2 + sizeof(struct ieee80211_meshconf_ie) + 845 2 + sizeof(__le16) + /* awake window */ 846 2 + sizeof(struct ieee80211_vht_cap) + 847 2 + sizeof(struct ieee80211_vht_operation) + 848 ie_len_he_cap + 849 2 + 1 + sizeof(struct ieee80211_he_operation) + 850 sizeof(struct ieee80211_he_6ghz_oper) + 851 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) + 852 ifmsh->ie_len; 853 854 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL); 855 /* need an skb for IE builders to operate on */ 856 skb = __dev_alloc_skb(max(head_len, tail_len), GFP_KERNEL); 857 858 if (!bcn || !skb) 859 goto out_free; 860 861 /* 862 * pointers go into the block we allocated, 863 * memory is | beacon_data | head | tail | 864 */ 865 bcn->head = ((u8 *) bcn) + sizeof(*bcn); 866 867 /* fill in the head */ 868 mgmt = skb_put_zero(skb, hdr_len); 869 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 870 IEEE80211_STYPE_BEACON); 871 eth_broadcast_addr(mgmt->da); 872 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 873 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 874 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt); 875 mgmt->u.beacon.beacon_int = 876 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 877 mgmt->u.beacon.capab_info |= cpu_to_le16( 878 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 879 880 pos = skb_put(skb, 2); 881 *pos++ = WLAN_EID_SSID; 882 *pos++ = 0x0; 883 884 rcu_read_lock(); 885 csa = rcu_dereference(ifmsh->csa); 886 if (csa) { 887 enum nl80211_channel_type ct; 888 struct cfg80211_chan_def *chandef; 889 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) + 890 2 + sizeof(struct ieee80211_mesh_chansw_params_ie); 891 892 pos = skb_put_zero(skb, ie_len); 893 *pos++ = WLAN_EID_CHANNEL_SWITCH; 894 *pos++ = 3; 895 *pos++ = 0x0; 896 *pos++ = ieee80211_frequency_to_channel( 897 csa->settings.chandef.chan->center_freq); 898 bcn->cntdwn_current_counter = csa->settings.count; 899 bcn->cntdwn_counter_offsets[0] = hdr_len + 6; 900 *pos++ = csa->settings.count; 901 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; 902 *pos++ = 6; 903 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) { 904 *pos++ = ifmsh->mshcfg.dot11MeshTTL; 905 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 906 } else { 907 *pos++ = ifmsh->chsw_ttl; 908 } 909 *pos++ |= csa->settings.block_tx ? 910 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00; 911 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); 912 pos += 2; 913 put_unaligned_le16(ifmsh->pre_value, pos); 914 pos += 2; 915 916 switch (csa->settings.chandef.width) { 917 case NL80211_CHAN_WIDTH_40: 918 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 919 pos = skb_put_zero(skb, ie_len); 920 921 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */ 922 *pos++ = 1; /* len */ 923 ct = cfg80211_get_chandef_type(&csa->settings.chandef); 924 if (ct == NL80211_CHAN_HT40PLUS) 925 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE; 926 else 927 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW; 928 break; 929 case NL80211_CHAN_WIDTH_80: 930 case NL80211_CHAN_WIDTH_80P80: 931 case NL80211_CHAN_WIDTH_160: 932 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */ 933 ie_len = 2 + 2 + 934 sizeof(struct ieee80211_wide_bw_chansw_ie); 935 pos = skb_put_zero(skb, ie_len); 936 937 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */ 938 *pos++ = 5; /* len */ 939 /* put sub IE */ 940 chandef = &csa->settings.chandef; 941 ieee80211_ie_build_wide_bw_cs(pos, chandef); 942 break; 943 default: 944 break; 945 } 946 } 947 rcu_read_unlock(); 948 949 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 950 mesh_add_ds_params_ie(sdata, skb)) 951 goto out_free; 952 953 bcn->head_len = skb->len; 954 memcpy(bcn->head, skb->data, bcn->head_len); 955 956 /* now the tail */ 957 skb_trim(skb, 0); 958 bcn->tail = bcn->head + bcn->head_len; 959 960 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 961 mesh_add_rsn_ie(sdata, skb) || 962 mesh_add_ht_cap_ie(sdata, skb) || 963 mesh_add_ht_oper_ie(sdata, skb) || 964 mesh_add_meshid_ie(sdata, skb) || 965 mesh_add_meshconf_ie(sdata, skb) || 966 mesh_add_awake_window_ie(sdata, skb) || 967 mesh_add_vht_cap_ie(sdata, skb) || 968 mesh_add_vht_oper_ie(sdata, skb) || 969 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) || 970 mesh_add_he_oper_ie(sdata, skb) || 971 mesh_add_he_6ghz_cap_ie(sdata, skb) || 972 mesh_add_vendor_ies(sdata, skb)) 973 goto out_free; 974 975 bcn->tail_len = skb->len; 976 memcpy(bcn->tail, skb->data, bcn->tail_len); 977 ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len); 978 bcn->meshconf = (struct ieee80211_meshconf_ie *) 979 (bcn->tail + ifmsh->meshconf_offset); 980 981 dev_kfree_skb(skb); 982 rcu_assign_pointer(ifmsh->beacon, bcn); 983 return 0; 984 out_free: 985 kfree(bcn); 986 dev_kfree_skb(skb); 987 return -ENOMEM; 988 } 989 990 static int 991 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata) 992 { 993 struct beacon_data *old_bcn; 994 int ret; 995 996 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon, 997 lockdep_is_held(&sdata->wdev.mtx)); 998 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh); 999 if (ret) 1000 /* just reuse old beacon */ 1001 return ret; 1002 1003 if (old_bcn) 1004 kfree_rcu(old_bcn, rcu_head); 1005 return 0; 1006 } 1007 1008 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 1009 u32 changed) 1010 { 1011 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1012 unsigned long bits = changed; 1013 u32 bit; 1014 1015 if (!bits) 1016 return; 1017 1018 /* if we race with running work, worst case this work becomes a noop */ 1019 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE) 1020 set_bit(bit, &ifmsh->mbss_changed); 1021 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags); 1022 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1023 } 1024 1025 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 1026 { 1027 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1028 struct ieee80211_local *local = sdata->local; 1029 u32 changed = BSS_CHANGED_BEACON | 1030 BSS_CHANGED_BEACON_ENABLED | 1031 BSS_CHANGED_HT | 1032 BSS_CHANGED_BASIC_RATES | 1033 BSS_CHANGED_BEACON_INT | 1034 BSS_CHANGED_MCAST_RATE; 1035 1036 local->fif_other_bss++; 1037 /* mesh ifaces must set allmulti to forward mcast traffic */ 1038 atomic_inc(&local->iff_allmultis); 1039 ieee80211_configure_filter(local); 1040 1041 ifmsh->mesh_cc_id = 0; /* Disabled */ 1042 /* register sync ops from extensible synchronization framework */ 1043 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id); 1044 ifmsh->sync_offset_clockdrift_max = 0; 1045 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 1046 ieee80211_mesh_root_setup(ifmsh); 1047 ieee80211_queue_work(&local->hw, &sdata->work); 1048 sdata->vif.bss_conf.ht_operation_mode = 1049 ifmsh->mshcfg.ht_opmode; 1050 sdata->vif.bss_conf.enable_beacon = true; 1051 1052 changed |= ieee80211_mps_local_status_update(sdata); 1053 1054 if (ieee80211_mesh_build_beacon(ifmsh)) { 1055 ieee80211_stop_mesh(sdata); 1056 return -ENOMEM; 1057 } 1058 1059 ieee80211_recalc_dtim(local, sdata); 1060 ieee80211_bss_info_change_notify(sdata, changed); 1061 1062 netif_carrier_on(sdata->dev); 1063 return 0; 1064 } 1065 1066 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 1067 { 1068 struct ieee80211_local *local = sdata->local; 1069 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1070 struct beacon_data *bcn; 1071 1072 netif_carrier_off(sdata->dev); 1073 1074 /* flush STAs and mpaths on this iface */ 1075 sta_info_flush(sdata); 1076 ieee80211_free_keys(sdata, true); 1077 mesh_path_flush_by_iface(sdata); 1078 1079 /* stop the beacon */ 1080 ifmsh->mesh_id_len = 0; 1081 sdata->vif.bss_conf.enable_beacon = false; 1082 sdata->beacon_rate_set = false; 1083 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 1084 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); 1085 1086 /* remove beacon */ 1087 bcn = rcu_dereference_protected(ifmsh->beacon, 1088 lockdep_is_held(&sdata->wdev.mtx)); 1089 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1090 kfree_rcu(bcn, rcu_head); 1091 1092 /* free all potentially still buffered group-addressed frames */ 1093 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf); 1094 skb_queue_purge(&ifmsh->ps.bc_buf); 1095 1096 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 1097 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 1098 del_timer_sync(&sdata->u.mesh.mesh_path_timer); 1099 1100 /* clear any mesh work (for next join) we may have accrued */ 1101 ifmsh->wrkq_flags = 0; 1102 ifmsh->mbss_changed = 0; 1103 1104 local->fif_other_bss--; 1105 atomic_dec(&local->iff_allmultis); 1106 ieee80211_configure_filter(local); 1107 } 1108 1109 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 1110 { 1111 int err; 1112 1113 /* if the current channel is a DFS channel, mark the channel as 1114 * unavailable. 1115 */ 1116 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 1117 &sdata->vif.bss_conf.chandef, 1118 NL80211_IFTYPE_MESH_POINT); 1119 if (err > 0) 1120 cfg80211_radar_event(sdata->local->hw.wiphy, 1121 &sdata->vif.bss_conf.chandef, GFP_ATOMIC); 1122 } 1123 1124 static bool 1125 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata, 1126 struct ieee802_11_elems *elems, bool beacon) 1127 { 1128 struct cfg80211_csa_settings params; 1129 struct ieee80211_csa_ie csa_ie; 1130 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1131 struct ieee80211_supported_band *sband; 1132 int err; 1133 u32 sta_flags, vht_cap_info = 0; 1134 1135 sdata_assert_lock(sdata); 1136 1137 sband = ieee80211_get_sband(sdata); 1138 if (!sband) 1139 return false; 1140 1141 sta_flags = 0; 1142 switch (sdata->vif.bss_conf.chandef.width) { 1143 case NL80211_CHAN_WIDTH_20_NOHT: 1144 sta_flags |= IEEE80211_STA_DISABLE_HT; 1145 fallthrough; 1146 case NL80211_CHAN_WIDTH_20: 1147 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 1148 fallthrough; 1149 case NL80211_CHAN_WIDTH_40: 1150 sta_flags |= IEEE80211_STA_DISABLE_VHT; 1151 break; 1152 default: 1153 break; 1154 } 1155 1156 if (elems->vht_cap_elem) 1157 vht_cap_info = 1158 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1159 1160 memset(¶ms, 0, sizeof(params)); 1161 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band, 1162 vht_cap_info, 1163 sta_flags, sdata->vif.addr, 1164 &csa_ie); 1165 if (err < 0) 1166 return false; 1167 if (err) 1168 return false; 1169 1170 /* Mark the channel unavailable if the reason for the switch is 1171 * regulatory. 1172 */ 1173 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY) 1174 ieee80211_mesh_csa_mark_radar(sdata); 1175 1176 params.chandef = csa_ie.chandef; 1177 params.count = csa_ie.count; 1178 1179 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, 1180 IEEE80211_CHAN_DISABLED) || 1181 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 1182 NL80211_IFTYPE_MESH_POINT)) { 1183 sdata_info(sdata, 1184 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 1185 sdata->vif.addr, 1186 params.chandef.chan->center_freq, 1187 params.chandef.width, 1188 params.chandef.center_freq1, 1189 params.chandef.center_freq2); 1190 return false; 1191 } 1192 1193 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 1194 ¶ms.chandef, 1195 NL80211_IFTYPE_MESH_POINT); 1196 if (err < 0) 1197 return false; 1198 if (err > 0 && !ifmsh->userspace_handles_dfs) { 1199 sdata_info(sdata, 1200 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 1201 sdata->vif.addr, 1202 params.chandef.chan->center_freq, 1203 params.chandef.width, 1204 params.chandef.center_freq1, 1205 params.chandef.center_freq2); 1206 return false; 1207 } 1208 1209 params.radar_required = err; 1210 1211 if (cfg80211_chandef_identical(¶ms.chandef, 1212 &sdata->vif.bss_conf.chandef)) { 1213 mcsa_dbg(sdata, 1214 "received csa with an identical chandef, ignoring\n"); 1215 return true; 1216 } 1217 1218 mcsa_dbg(sdata, 1219 "received channel switch announcement to go to channel %d MHz\n", 1220 params.chandef.chan->center_freq); 1221 1222 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT; 1223 if (beacon) { 1224 ifmsh->chsw_ttl = csa_ie.ttl - 1; 1225 if (ifmsh->pre_value >= csa_ie.pre_value) 1226 return false; 1227 ifmsh->pre_value = csa_ie.pre_value; 1228 } 1229 1230 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) 1231 return false; 1232 1233 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; 1234 1235 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 1236 ¶ms) < 0) 1237 return false; 1238 1239 return true; 1240 } 1241 1242 static void 1243 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, 1244 struct ieee80211_mgmt *mgmt, size_t len) 1245 { 1246 struct ieee80211_local *local = sdata->local; 1247 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1248 struct sk_buff *presp; 1249 struct beacon_data *bcn; 1250 struct ieee80211_mgmt *hdr; 1251 struct ieee802_11_elems *elems; 1252 size_t baselen; 1253 u8 *pos; 1254 1255 pos = mgmt->u.probe_req.variable; 1256 baselen = (u8 *) pos - (u8 *) mgmt; 1257 if (baselen > len) 1258 return; 1259 1260 elems = ieee802_11_parse_elems(pos, len - baselen, false, mgmt->bssid, 1261 NULL); 1262 if (!elems) 1263 return; 1264 1265 if (!elems->mesh_id) 1266 goto free; 1267 1268 /* 802.11-2012 10.1.4.3.2 */ 1269 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && 1270 !is_broadcast_ether_addr(mgmt->da)) || 1271 elems->ssid_len != 0) 1272 goto free; 1273 1274 if (elems->mesh_id_len != 0 && 1275 (elems->mesh_id_len != ifmsh->mesh_id_len || 1276 memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) 1277 goto free; 1278 1279 rcu_read_lock(); 1280 bcn = rcu_dereference(ifmsh->beacon); 1281 1282 if (!bcn) 1283 goto out; 1284 1285 presp = dev_alloc_skb(local->tx_headroom + 1286 bcn->head_len + bcn->tail_len); 1287 if (!presp) 1288 goto out; 1289 1290 skb_reserve(presp, local->tx_headroom); 1291 skb_put_data(presp, bcn->head, bcn->head_len); 1292 skb_put_data(presp, bcn->tail, bcn->tail_len); 1293 hdr = (struct ieee80211_mgmt *) presp->data; 1294 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1295 IEEE80211_STYPE_PROBE_RESP); 1296 memcpy(hdr->da, mgmt->sa, ETH_ALEN); 1297 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1298 ieee80211_tx_skb(sdata, presp); 1299 out: 1300 rcu_read_unlock(); 1301 free: 1302 kfree(elems); 1303 } 1304 1305 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 1306 u16 stype, 1307 struct ieee80211_mgmt *mgmt, 1308 size_t len, 1309 struct ieee80211_rx_status *rx_status) 1310 { 1311 struct ieee80211_local *local = sdata->local; 1312 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1313 struct ieee802_11_elems *elems; 1314 struct ieee80211_channel *channel; 1315 size_t baselen; 1316 int freq; 1317 enum nl80211_band band = rx_status->band; 1318 1319 /* ignore ProbeResp to foreign address */ 1320 if (stype == IEEE80211_STYPE_PROBE_RESP && 1321 !ether_addr_equal(mgmt->da, sdata->vif.addr)) 1322 return; 1323 1324 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1325 if (baselen > len) 1326 return; 1327 1328 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1329 len - baselen, 1330 false, mgmt->bssid, NULL); 1331 if (!elems) 1332 return; 1333 1334 /* ignore non-mesh or secure / unsecure mismatch */ 1335 if ((!elems->mesh_id || !elems->mesh_config) || 1336 (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) || 1337 (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)) 1338 goto free; 1339 1340 if (elems->ds_params) 1341 freq = ieee80211_channel_to_frequency(elems->ds_params[0], band); 1342 else 1343 freq = rx_status->freq; 1344 1345 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1346 1347 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1348 goto free; 1349 1350 if (mesh_matches_local(sdata, elems)) { 1351 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n", 1352 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal); 1353 if (!sdata->u.mesh.user_mpm || 1354 sdata->u.mesh.mshcfg.rssi_threshold == 0 || 1355 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal) 1356 mesh_neighbour_update(sdata, mgmt->sa, elems, 1357 rx_status); 1358 1359 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && 1360 !sdata->vif.csa_active) 1361 ieee80211_mesh_process_chnswitch(sdata, elems, true); 1362 } 1363 1364 if (ifmsh->sync_ops) 1365 ifmsh->sync_ops->rx_bcn_presp(sdata, stype, mgmt, len, 1366 elems->mesh_config, rx_status); 1367 free: 1368 kfree(elems); 1369 } 1370 1371 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata) 1372 { 1373 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1374 struct mesh_csa_settings *tmp_csa_settings; 1375 int ret = 0; 1376 int changed = 0; 1377 1378 /* Reset the TTL value and Initiator flag */ 1379 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1380 ifmsh->chsw_ttl = 0; 1381 1382 /* Remove the CSA and MCSP elements from the beacon */ 1383 tmp_csa_settings = rcu_dereference_protected(ifmsh->csa, 1384 lockdep_is_held(&sdata->wdev.mtx)); 1385 RCU_INIT_POINTER(ifmsh->csa, NULL); 1386 if (tmp_csa_settings) 1387 kfree_rcu(tmp_csa_settings, rcu_head); 1388 ret = ieee80211_mesh_rebuild_beacon(sdata); 1389 if (ret) 1390 return -EINVAL; 1391 1392 changed |= BSS_CHANGED_BEACON; 1393 1394 mcsa_dbg(sdata, "complete switching to center freq %d MHz", 1395 sdata->vif.bss_conf.chandef.chan->center_freq); 1396 return changed; 1397 } 1398 1399 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, 1400 struct cfg80211_csa_settings *csa_settings) 1401 { 1402 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1403 struct mesh_csa_settings *tmp_csa_settings; 1404 int ret = 0; 1405 1406 lockdep_assert_held(&sdata->wdev.mtx); 1407 1408 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings), 1409 GFP_ATOMIC); 1410 if (!tmp_csa_settings) 1411 return -ENOMEM; 1412 1413 memcpy(&tmp_csa_settings->settings, csa_settings, 1414 sizeof(struct cfg80211_csa_settings)); 1415 1416 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings); 1417 1418 ret = ieee80211_mesh_rebuild_beacon(sdata); 1419 if (ret) { 1420 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1421 RCU_INIT_POINTER(ifmsh->csa, NULL); 1422 kfree_rcu(tmp_csa_settings, rcu_head); 1423 return ret; 1424 } 1425 1426 return BSS_CHANGED_BEACON; 1427 } 1428 1429 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata, 1430 struct ieee80211_mgmt *mgmt, size_t len, 1431 struct ieee802_11_elems *elems) 1432 { 1433 struct ieee80211_mgmt *mgmt_fwd; 1434 struct sk_buff *skb; 1435 struct ieee80211_local *local = sdata->local; 1436 1437 skb = dev_alloc_skb(local->tx_headroom + len); 1438 if (!skb) 1439 return -ENOMEM; 1440 skb_reserve(skb, local->tx_headroom); 1441 mgmt_fwd = skb_put(skb, len); 1442 1443 elems->mesh_chansw_params_ie->mesh_ttl--; 1444 elems->mesh_chansw_params_ie->mesh_flags &= 1445 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 1446 1447 memcpy(mgmt_fwd, mgmt, len); 1448 eth_broadcast_addr(mgmt_fwd->da); 1449 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN); 1450 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN); 1451 1452 ieee80211_tx_skb(sdata, skb); 1453 return 0; 1454 } 1455 1456 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata, 1457 struct ieee80211_mgmt *mgmt, size_t len) 1458 { 1459 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1460 struct ieee802_11_elems *elems; 1461 u16 pre_value; 1462 bool fwd_csa = true; 1463 size_t baselen; 1464 u8 *pos; 1465 1466 if (mgmt->u.action.u.measurement.action_code != 1467 WLAN_ACTION_SPCT_CHL_SWITCH) 1468 return; 1469 1470 pos = mgmt->u.action.u.chan_switch.variable; 1471 baselen = offsetof(struct ieee80211_mgmt, 1472 u.action.u.chan_switch.variable); 1473 elems = ieee802_11_parse_elems(pos, len - baselen, true, 1474 mgmt->bssid, NULL); 1475 if (!elems) 1476 return; 1477 1478 if (!mesh_matches_local(sdata, elems)) 1479 goto free; 1480 1481 ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl; 1482 if (!--ifmsh->chsw_ttl) 1483 fwd_csa = false; 1484 1485 pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value); 1486 if (ifmsh->pre_value >= pre_value) 1487 goto free; 1488 1489 ifmsh->pre_value = pre_value; 1490 1491 if (!sdata->vif.csa_active && 1492 !ieee80211_mesh_process_chnswitch(sdata, elems, false)) { 1493 mcsa_dbg(sdata, "Failed to process CSA action frame"); 1494 goto free; 1495 } 1496 1497 /* forward or re-broadcast the CSA frame */ 1498 if (fwd_csa) { 1499 if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0) 1500 mcsa_dbg(sdata, "Failed to forward the CSA frame"); 1501 } 1502 free: 1503 kfree(elems); 1504 } 1505 1506 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 1507 struct ieee80211_mgmt *mgmt, 1508 size_t len, 1509 struct ieee80211_rx_status *rx_status) 1510 { 1511 switch (mgmt->u.action.category) { 1512 case WLAN_CATEGORY_SELF_PROTECTED: 1513 switch (mgmt->u.action.u.self_prot.action_code) { 1514 case WLAN_SP_MESH_PEERING_OPEN: 1515 case WLAN_SP_MESH_PEERING_CLOSE: 1516 case WLAN_SP_MESH_PEERING_CONFIRM: 1517 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 1518 break; 1519 } 1520 break; 1521 case WLAN_CATEGORY_MESH_ACTION: 1522 if (mesh_action_is_path_sel(mgmt)) 1523 mesh_rx_path_sel_frame(sdata, mgmt, len); 1524 break; 1525 case WLAN_CATEGORY_SPECTRUM_MGMT: 1526 mesh_rx_csa_frame(sdata, mgmt, len); 1527 break; 1528 } 1529 } 1530 1531 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1532 struct sk_buff *skb) 1533 { 1534 struct ieee80211_rx_status *rx_status; 1535 struct ieee80211_mgmt *mgmt; 1536 u16 stype; 1537 1538 sdata_lock(sdata); 1539 1540 /* mesh already went down */ 1541 if (!sdata->u.mesh.mesh_id_len) 1542 goto out; 1543 1544 rx_status = IEEE80211_SKB_RXCB(skb); 1545 mgmt = (struct ieee80211_mgmt *) skb->data; 1546 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 1547 1548 switch (stype) { 1549 case IEEE80211_STYPE_PROBE_RESP: 1550 case IEEE80211_STYPE_BEACON: 1551 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 1552 rx_status); 1553 break; 1554 case IEEE80211_STYPE_PROBE_REQ: 1555 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); 1556 break; 1557 case IEEE80211_STYPE_ACTION: 1558 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 1559 break; 1560 } 1561 out: 1562 sdata_unlock(sdata); 1563 } 1564 1565 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) 1566 { 1567 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1568 u32 bit, changed = 0; 1569 1570 for_each_set_bit(bit, &ifmsh->mbss_changed, 1571 sizeof(changed) * BITS_PER_BYTE) { 1572 clear_bit(bit, &ifmsh->mbss_changed); 1573 changed |= BIT(bit); 1574 } 1575 1576 if (sdata->vif.bss_conf.enable_beacon && 1577 (changed & (BSS_CHANGED_BEACON | 1578 BSS_CHANGED_HT | 1579 BSS_CHANGED_BASIC_RATES | 1580 BSS_CHANGED_BEACON_INT))) 1581 if (ieee80211_mesh_rebuild_beacon(sdata)) 1582 return; 1583 1584 ieee80211_bss_info_change_notify(sdata, changed); 1585 } 1586 1587 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 1588 { 1589 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1590 1591 sdata_lock(sdata); 1592 1593 /* mesh already went down */ 1594 if (!sdata->u.mesh.mesh_id_len) 1595 goto out; 1596 1597 if (ifmsh->preq_queue_len && 1598 time_after(jiffies, 1599 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 1600 mesh_path_start_discovery(sdata); 1601 1602 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 1603 ieee80211_mesh_housekeeping(sdata); 1604 1605 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 1606 ieee80211_mesh_rootpath(sdata); 1607 1608 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags)) 1609 mesh_sync_adjust_tsf(sdata); 1610 1611 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) 1612 mesh_bss_info_changed(sdata); 1613 out: 1614 sdata_unlock(sdata); 1615 } 1616 1617 1618 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 1619 { 1620 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1621 static u8 zero_addr[ETH_ALEN] = {}; 1622 1623 timer_setup(&ifmsh->housekeeping_timer, 1624 ieee80211_mesh_housekeeping_timer, 0); 1625 1626 ifmsh->accepting_plinks = true; 1627 atomic_set(&ifmsh->mpaths, 0); 1628 mesh_rmc_init(sdata); 1629 ifmsh->last_preq = jiffies; 1630 ifmsh->next_perr = jiffies; 1631 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1632 /* Allocate all mesh structures when creating the first mesh interface. */ 1633 if (!mesh_allocated) 1634 ieee80211s_init(); 1635 1636 mesh_pathtbl_init(sdata); 1637 1638 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0); 1639 timer_setup(&ifmsh->mesh_path_root_timer, 1640 ieee80211_mesh_path_root_timer, 0); 1641 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 1642 skb_queue_head_init(&ifmsh->ps.bc_buf); 1643 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 1644 spin_lock_init(&ifmsh->sync_offset_lock); 1645 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1646 1647 sdata->vif.bss_conf.bssid = zero_addr; 1648 } 1649 1650 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1651 { 1652 mesh_rmc_free(sdata); 1653 mesh_pathtbl_unregister(sdata); 1654 } 1655