1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2008, 2009 open80211s Ltd. 4 * Copyright (C) 2018 - 2020 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, &sta_chan_def); 108 109 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef, 110 &sta_chan_def)) 111 return false; 112 113 return true; 114 } 115 116 /** 117 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links 118 * 119 * @ie: information elements of a management frame from the mesh peer 120 */ 121 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) 122 { 123 return (ie->mesh_config->meshconf_cap & 124 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0; 125 } 126 127 /** 128 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons 129 * 130 * @sdata: mesh interface in which mesh beacons are going to be updated 131 * 132 * Returns: beacon changed flag if the beacon content changed. 133 */ 134 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) 135 { 136 bool free_plinks; 137 u32 changed = 0; 138 139 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, 140 * the mesh interface might be able to establish plinks with peers that 141 * are already on the table but are not on PLINK_ESTAB state. However, 142 * in general the mesh interface is not accepting peer link requests 143 * from new peers, and that must be reflected in the beacon 144 */ 145 free_plinks = mesh_plink_availables(sdata); 146 147 if (free_plinks != sdata->u.mesh.accepting_plinks) { 148 sdata->u.mesh.accepting_plinks = free_plinks; 149 changed = BSS_CHANGED_BEACON; 150 } 151 152 return changed; 153 } 154 155 /* 156 * mesh_sta_cleanup - clean up any mesh sta state 157 * 158 * @sta: mesh sta to clean up. 159 */ 160 void mesh_sta_cleanup(struct sta_info *sta) 161 { 162 struct ieee80211_sub_if_data *sdata = sta->sdata; 163 u32 changed = mesh_plink_deactivate(sta); 164 165 if (changed) 166 ieee80211_mbss_info_change_notify(sdata, changed); 167 } 168 169 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) 170 { 171 int i; 172 173 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); 174 if (!sdata->u.mesh.rmc) 175 return -ENOMEM; 176 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; 177 for (i = 0; i < RMC_BUCKETS; i++) 178 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]); 179 return 0; 180 } 181 182 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) 183 { 184 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 185 struct rmc_entry *p; 186 struct hlist_node *n; 187 int i; 188 189 if (!sdata->u.mesh.rmc) 190 return; 191 192 for (i = 0; i < RMC_BUCKETS; i++) { 193 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) { 194 hlist_del(&p->list); 195 kmem_cache_free(rm_cache, p); 196 } 197 } 198 199 kfree(rmc); 200 sdata->u.mesh.rmc = NULL; 201 } 202 203 /** 204 * mesh_rmc_check - Check frame in recent multicast cache and add if absent. 205 * 206 * @sdata: interface 207 * @sa: source address 208 * @mesh_hdr: mesh_header 209 * 210 * Returns: 0 if the frame is not in the cache, nonzero otherwise. 211 * 212 * Checks using the source address and the mesh sequence number if we have 213 * received this frame lately. If the frame is not in the cache, it is added to 214 * it. 215 */ 216 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 217 const u8 *sa, struct ieee80211s_hdr *mesh_hdr) 218 { 219 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 220 u32 seqnum = 0; 221 int entries = 0; 222 u8 idx; 223 struct rmc_entry *p; 224 struct hlist_node *n; 225 226 if (!rmc) 227 return -1; 228 229 /* Don't care about endianness since only match matters */ 230 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); 231 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; 232 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) { 233 ++entries; 234 if (time_after(jiffies, p->exp_time) || 235 entries == RMC_QUEUE_MAX_LEN) { 236 hlist_del(&p->list); 237 kmem_cache_free(rm_cache, p); 238 --entries; 239 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa)) 240 return -1; 241 } 242 243 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); 244 if (!p) 245 return 0; 246 247 p->seqnum = seqnum; 248 p->exp_time = jiffies + RMC_TIMEOUT; 249 memcpy(p->sa, sa, ETH_ALEN); 250 hlist_add_head(&p->list, &rmc->bucket[idx]); 251 return 0; 252 } 253 254 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 255 struct sk_buff *skb) 256 { 257 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 258 u8 *pos, neighbors; 259 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie); 260 bool is_connected_to_gate = ifmsh->num_gates > 0 || 261 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol || 262 ifmsh->mshcfg.dot11MeshConnectedToMeshGate; 263 bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer; 264 265 if (skb_tailroom(skb) < 2 + meshconf_len) 266 return -ENOMEM; 267 268 pos = skb_put(skb, 2 + meshconf_len); 269 *pos++ = WLAN_EID_MESH_CONFIG; 270 *pos++ = meshconf_len; 271 272 /* save a pointer for quick updates in pre-tbtt */ 273 ifmsh->meshconf_offset = pos - skb->data; 274 275 /* Active path selection protocol ID */ 276 *pos++ = ifmsh->mesh_pp_id; 277 /* Active path selection metric ID */ 278 *pos++ = ifmsh->mesh_pm_id; 279 /* Congestion control mode identifier */ 280 *pos++ = ifmsh->mesh_cc_id; 281 /* Synchronization protocol identifier */ 282 *pos++ = ifmsh->mesh_sp_id; 283 /* Authentication Protocol identifier */ 284 *pos++ = ifmsh->mesh_auth_id; 285 /* Mesh Formation Info - number of neighbors */ 286 neighbors = atomic_read(&ifmsh->estab_plinks); 287 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS); 288 *pos++ = (is_connected_to_as << 7) | 289 (neighbors << 1) | 290 is_connected_to_gate; 291 /* Mesh capability */ 292 *pos = 0x00; 293 *pos |= ifmsh->mshcfg.dot11MeshForwarding ? 294 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00; 295 *pos |= ifmsh->accepting_plinks ? 296 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; 297 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */ 298 *pos |= ifmsh->ps_peers_deep_sleep ? 299 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00; 300 return 0; 301 } 302 303 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 304 { 305 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 306 u8 *pos; 307 308 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len) 309 return -ENOMEM; 310 311 pos = skb_put(skb, 2 + ifmsh->mesh_id_len); 312 *pos++ = WLAN_EID_MESH_ID; 313 *pos++ = ifmsh->mesh_id_len; 314 if (ifmsh->mesh_id_len) 315 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len); 316 317 return 0; 318 } 319 320 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata, 321 struct sk_buff *skb) 322 { 323 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 324 u8 *pos; 325 326 /* see IEEE802.11-2012 13.14.6 */ 327 if (ifmsh->ps_peers_light_sleep == 0 && 328 ifmsh->ps_peers_deep_sleep == 0 && 329 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE) 330 return 0; 331 332 if (skb_tailroom(skb) < 4) 333 return -ENOMEM; 334 335 pos = skb_put(skb, 2 + 2); 336 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW; 337 *pos++ = 2; 338 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos); 339 340 return 0; 341 } 342 343 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 344 struct sk_buff *skb) 345 { 346 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 347 u8 offset, len; 348 const u8 *data; 349 350 if (!ifmsh->ie || !ifmsh->ie_len) 351 return 0; 352 353 /* fast-forward to vendor IEs */ 354 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0); 355 356 if (offset < ifmsh->ie_len) { 357 len = ifmsh->ie_len - offset; 358 data = ifmsh->ie + offset; 359 if (skb_tailroom(skb) < len) 360 return -ENOMEM; 361 skb_put_data(skb, data, len); 362 } 363 364 return 0; 365 } 366 367 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 368 { 369 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 370 u8 len = 0; 371 const u8 *data; 372 373 if (!ifmsh->ie || !ifmsh->ie_len) 374 return 0; 375 376 /* find RSN IE */ 377 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len); 378 if (!data) 379 return 0; 380 381 len = data[1] + 2; 382 383 if (skb_tailroom(skb) < len) 384 return -ENOMEM; 385 skb_put_data(skb, data, len); 386 387 return 0; 388 } 389 390 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata, 391 struct sk_buff *skb) 392 { 393 struct ieee80211_chanctx_conf *chanctx_conf; 394 struct ieee80211_channel *chan; 395 u8 *pos; 396 397 if (skb_tailroom(skb) < 3) 398 return -ENOMEM; 399 400 rcu_read_lock(); 401 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 402 if (WARN_ON(!chanctx_conf)) { 403 rcu_read_unlock(); 404 return -EINVAL; 405 } 406 chan = chanctx_conf->def.chan; 407 rcu_read_unlock(); 408 409 pos = skb_put(skb, 2 + 1); 410 *pos++ = WLAN_EID_DS_PARAMS; 411 *pos++ = 1; 412 *pos++ = ieee80211_frequency_to_channel(chan->center_freq); 413 414 return 0; 415 } 416 417 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 418 struct sk_buff *skb) 419 { 420 struct ieee80211_supported_band *sband; 421 u8 *pos; 422 423 sband = ieee80211_get_sband(sdata); 424 if (!sband) 425 return -EINVAL; 426 427 /* HT not allowed in 6 GHz */ 428 if (sband->band == NL80211_BAND_6GHZ) 429 return 0; 430 431 if (!sband->ht_cap.ht_supported || 432 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 433 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 434 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 435 return 0; 436 437 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap)) 438 return -ENOMEM; 439 440 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap)); 441 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap); 442 443 return 0; 444 } 445 446 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 447 struct sk_buff *skb) 448 { 449 struct ieee80211_local *local = sdata->local; 450 struct ieee80211_chanctx_conf *chanctx_conf; 451 struct ieee80211_channel *channel; 452 struct ieee80211_supported_band *sband; 453 struct ieee80211_sta_ht_cap *ht_cap; 454 u8 *pos; 455 456 rcu_read_lock(); 457 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 458 if (WARN_ON(!chanctx_conf)) { 459 rcu_read_unlock(); 460 return -EINVAL; 461 } 462 channel = chanctx_conf->def.chan; 463 rcu_read_unlock(); 464 465 sband = local->hw.wiphy->bands[channel->band]; 466 ht_cap = &sband->ht_cap; 467 468 /* HT not allowed in 6 GHz */ 469 if (sband->band == NL80211_BAND_6GHZ) 470 return 0; 471 472 if (!ht_cap->ht_supported || 473 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 474 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 475 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 476 return 0; 477 478 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation)) 479 return -ENOMEM; 480 481 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 482 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef, 483 sdata->vif.bss_conf.ht_operation_mode, 484 false); 485 486 return 0; 487 } 488 489 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, 490 struct sk_buff *skb) 491 { 492 struct ieee80211_supported_band *sband; 493 u8 *pos; 494 495 sband = ieee80211_get_sband(sdata); 496 if (!sband) 497 return -EINVAL; 498 499 /* VHT not allowed in 6 GHz */ 500 if (sband->band == NL80211_BAND_6GHZ) 501 return 0; 502 503 if (!sband->vht_cap.vht_supported || 504 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 505 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 506 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 507 return 0; 508 509 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap)) 510 return -ENOMEM; 511 512 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap)); 513 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap); 514 515 return 0; 516 } 517 518 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, 519 struct sk_buff *skb) 520 { 521 struct ieee80211_local *local = sdata->local; 522 struct ieee80211_chanctx_conf *chanctx_conf; 523 struct ieee80211_channel *channel; 524 struct ieee80211_supported_band *sband; 525 struct ieee80211_sta_vht_cap *vht_cap; 526 u8 *pos; 527 528 rcu_read_lock(); 529 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 530 if (WARN_ON(!chanctx_conf)) { 531 rcu_read_unlock(); 532 return -EINVAL; 533 } 534 channel = chanctx_conf->def.chan; 535 rcu_read_unlock(); 536 537 sband = local->hw.wiphy->bands[channel->band]; 538 vht_cap = &sband->vht_cap; 539 540 /* VHT not allowed in 6 GHz */ 541 if (sband->band == NL80211_BAND_6GHZ) 542 return 0; 543 544 if (!vht_cap->vht_supported || 545 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 546 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 547 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 548 return 0; 549 550 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation)) 551 return -ENOMEM; 552 553 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 554 ieee80211_ie_build_vht_oper(pos, vht_cap, 555 &sdata->vif.bss_conf.chandef); 556 557 return 0; 558 } 559 560 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata, 561 struct sk_buff *skb, u8 ie_len) 562 { 563 const struct ieee80211_sta_he_cap *he_cap; 564 struct ieee80211_supported_band *sband; 565 u8 *pos; 566 567 sband = ieee80211_get_sband(sdata); 568 if (!sband) 569 return -EINVAL; 570 571 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT); 572 573 if (!he_cap || 574 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 575 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 576 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 577 return 0; 578 579 if (skb_tailroom(skb) < ie_len) 580 return -ENOMEM; 581 582 pos = skb_put(skb, ie_len); 583 ieee80211_ie_build_he_cap(pos, he_cap, pos + ie_len); 584 585 return 0; 586 } 587 588 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata, 589 struct sk_buff *skb) 590 { 591 const struct ieee80211_sta_he_cap *he_cap; 592 struct ieee80211_supported_band *sband; 593 u32 len; 594 u8 *pos; 595 596 sband = ieee80211_get_sband(sdata); 597 if (!sband) 598 return -EINVAL; 599 600 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT); 601 if (!he_cap || 602 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 603 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 604 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 605 return 0; 606 607 len = 2 + 1 + sizeof(struct ieee80211_he_operation); 608 if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ) 609 len += sizeof(struct ieee80211_he_6ghz_oper); 610 611 if (skb_tailroom(skb) < len) 612 return -ENOMEM; 613 614 pos = skb_put(skb, len); 615 ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef); 616 617 return 0; 618 } 619 620 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata, 621 struct sk_buff *skb) 622 { 623 struct ieee80211_supported_band *sband; 624 const struct ieee80211_sband_iftype_data *iftd; 625 626 sband = ieee80211_get_sband(sdata); 627 if (!sband) 628 return -EINVAL; 629 630 iftd = ieee80211_get_sband_iftype_data(sband, 631 NL80211_IFTYPE_MESH_POINT); 632 /* The device doesn't support HE in mesh mode or at all */ 633 if (!iftd) 634 return 0; 635 636 ieee80211_ie_build_he_6ghz_cap(sdata, skb); 637 return 0; 638 } 639 640 static void ieee80211_mesh_path_timer(struct timer_list *t) 641 { 642 struct ieee80211_sub_if_data *sdata = 643 from_timer(sdata, t, u.mesh.mesh_path_timer); 644 645 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 646 } 647 648 static void ieee80211_mesh_path_root_timer(struct timer_list *t) 649 { 650 struct ieee80211_sub_if_data *sdata = 651 from_timer(sdata, t, u.mesh.mesh_path_root_timer); 652 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 653 654 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 655 656 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 657 } 658 659 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh) 660 { 661 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT) 662 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 663 else { 664 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 665 /* stop running timer */ 666 del_timer_sync(&ifmsh->mesh_path_root_timer); 667 } 668 } 669 670 static void 671 ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata, 672 u8 *ie, u8 ie_len) 673 { 674 struct ieee80211_supported_band *sband; 675 const struct element *cap; 676 const struct ieee80211_he_operation *he_oper = NULL; 677 678 sband = ieee80211_get_sband(sdata); 679 if (!sband) 680 return; 681 682 if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) || 683 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 684 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 685 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 686 return; 687 688 sdata->vif.bss_conf.he_support = true; 689 690 cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len); 691 if (cap && cap->datalen >= 1 + sizeof(*he_oper) && 692 cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1)) 693 he_oper = (void *)(cap->data + 1); 694 695 if (he_oper) 696 sdata->vif.bss_conf.he_oper.params = 697 __le32_to_cpu(he_oper->he_oper_params); 698 } 699 700 /** 701 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame 702 * @hdr: 802.11 frame header 703 * @fc: frame control field 704 * @meshda: destination address in the mesh 705 * @meshsa: source address in the mesh. Same as TA, as frame is 706 * locally originated. 707 * 708 * Return the length of the 802.11 (does not include a mesh control header) 709 */ 710 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 711 const u8 *meshda, const u8 *meshsa) 712 { 713 if (is_multicast_ether_addr(meshda)) { 714 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 715 /* DA TA SA */ 716 memcpy(hdr->addr1, meshda, ETH_ALEN); 717 memcpy(hdr->addr2, meshsa, ETH_ALEN); 718 memcpy(hdr->addr3, meshsa, ETH_ALEN); 719 return 24; 720 } else { 721 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 722 /* RA TA DA SA */ 723 eth_zero_addr(hdr->addr1); /* RA is resolved later */ 724 memcpy(hdr->addr2, meshsa, ETH_ALEN); 725 memcpy(hdr->addr3, meshda, ETH_ALEN); 726 memcpy(hdr->addr4, meshsa, ETH_ALEN); 727 return 30; 728 } 729 } 730 731 /** 732 * ieee80211_new_mesh_header - create a new mesh header 733 * @sdata: mesh interface to be used 734 * @meshhdr: uninitialized mesh header 735 * @addr4or5: 1st address in the ae header, which may correspond to address 4 736 * (if addr6 is NULL) or address 5 (if addr6 is present). It may 737 * be NULL. 738 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the 739 * mesh frame 740 * 741 * Return the header length. 742 */ 743 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 744 struct ieee80211s_hdr *meshhdr, 745 const char *addr4or5, const char *addr6) 746 { 747 if (WARN_ON(!addr4or5 && addr6)) 748 return 0; 749 750 memset(meshhdr, 0, sizeof(*meshhdr)); 751 752 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; 753 754 /* FIXME: racy -- TX on multiple queues can be concurrent */ 755 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); 756 sdata->u.mesh.mesh_seqnum++; 757 758 if (addr4or5 && !addr6) { 759 meshhdr->flags |= MESH_FLAGS_AE_A4; 760 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 761 return 2 * ETH_ALEN; 762 } else if (addr4or5 && addr6) { 763 meshhdr->flags |= MESH_FLAGS_AE_A5_A6; 764 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 765 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); 766 return 3 * ETH_ALEN; 767 } 768 769 return ETH_ALEN; 770 } 771 772 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata) 773 { 774 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 775 u32 changed; 776 777 if (ifmsh->mshcfg.plink_timeout > 0) 778 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ); 779 mesh_path_expire(sdata); 780 781 changed = mesh_accept_plinks_update(sdata); 782 ieee80211_mbss_info_change_notify(sdata, changed); 783 784 mod_timer(&ifmsh->housekeeping_timer, 785 round_jiffies(jiffies + 786 IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); 787 } 788 789 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) 790 { 791 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 792 u32 interval; 793 794 mesh_path_tx_root_frame(sdata); 795 796 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN) 797 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; 798 else 799 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval; 800 801 mod_timer(&ifmsh->mesh_path_root_timer, 802 round_jiffies(TU_TO_EXP_TIME(interval))); 803 } 804 805 static int 806 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh) 807 { 808 struct beacon_data *bcn; 809 int head_len, tail_len; 810 struct sk_buff *skb; 811 struct ieee80211_mgmt *mgmt; 812 struct ieee80211_chanctx_conf *chanctx_conf; 813 struct mesh_csa_settings *csa; 814 enum nl80211_band band; 815 u8 ie_len_he_cap; 816 u8 *pos; 817 struct ieee80211_sub_if_data *sdata; 818 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon); 819 820 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh); 821 rcu_read_lock(); 822 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 823 band = chanctx_conf->def.chan->band; 824 rcu_read_unlock(); 825 826 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata, 827 NL80211_IFTYPE_MESH_POINT); 828 head_len = hdr_len + 829 2 + /* NULL SSID */ 830 /* Channel Switch Announcement */ 831 2 + sizeof(struct ieee80211_channel_sw_ie) + 832 /* Mesh Channel Switch Parameters */ 833 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) + 834 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */ 835 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) + 836 2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 837 2 + 8 + /* supported rates */ 838 2 + 3; /* DS params */ 839 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 840 2 + sizeof(struct ieee80211_ht_cap) + 841 2 + sizeof(struct ieee80211_ht_operation) + 842 2 + ifmsh->mesh_id_len + 843 2 + sizeof(struct ieee80211_meshconf_ie) + 844 2 + sizeof(__le16) + /* awake window */ 845 2 + sizeof(struct ieee80211_vht_cap) + 846 2 + sizeof(struct ieee80211_vht_operation) + 847 ie_len_he_cap + 848 2 + 1 + sizeof(struct ieee80211_he_operation) + 849 sizeof(struct ieee80211_he_6ghz_oper) + 850 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) + 851 ifmsh->ie_len; 852 853 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL); 854 /* need an skb for IE builders to operate on */ 855 skb = dev_alloc_skb(max(head_len, tail_len)); 856 857 if (!bcn || !skb) 858 goto out_free; 859 860 /* 861 * pointers go into the block we allocated, 862 * memory is | beacon_data | head | tail | 863 */ 864 bcn->head = ((u8 *) bcn) + sizeof(*bcn); 865 866 /* fill in the head */ 867 mgmt = skb_put_zero(skb, hdr_len); 868 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 869 IEEE80211_STYPE_BEACON); 870 eth_broadcast_addr(mgmt->da); 871 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 872 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 873 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt); 874 mgmt->u.beacon.beacon_int = 875 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 876 mgmt->u.beacon.capab_info |= cpu_to_le16( 877 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 878 879 pos = skb_put(skb, 2); 880 *pos++ = WLAN_EID_SSID; 881 *pos++ = 0x0; 882 883 rcu_read_lock(); 884 csa = rcu_dereference(ifmsh->csa); 885 if (csa) { 886 enum nl80211_channel_type ct; 887 struct cfg80211_chan_def *chandef; 888 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) + 889 2 + sizeof(struct ieee80211_mesh_chansw_params_ie); 890 891 pos = skb_put_zero(skb, ie_len); 892 *pos++ = WLAN_EID_CHANNEL_SWITCH; 893 *pos++ = 3; 894 *pos++ = 0x0; 895 *pos++ = ieee80211_frequency_to_channel( 896 csa->settings.chandef.chan->center_freq); 897 bcn->cntdwn_current_counter = csa->settings.count; 898 bcn->cntdwn_counter_offsets[0] = hdr_len + 6; 899 *pos++ = csa->settings.count; 900 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; 901 *pos++ = 6; 902 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) { 903 *pos++ = ifmsh->mshcfg.dot11MeshTTL; 904 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 905 } else { 906 *pos++ = ifmsh->chsw_ttl; 907 } 908 *pos++ |= csa->settings.block_tx ? 909 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00; 910 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); 911 pos += 2; 912 put_unaligned_le16(ifmsh->pre_value, pos); 913 pos += 2; 914 915 switch (csa->settings.chandef.width) { 916 case NL80211_CHAN_WIDTH_40: 917 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 918 pos = skb_put_zero(skb, ie_len); 919 920 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */ 921 *pos++ = 1; /* len */ 922 ct = cfg80211_get_chandef_type(&csa->settings.chandef); 923 if (ct == NL80211_CHAN_HT40PLUS) 924 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE; 925 else 926 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW; 927 break; 928 case NL80211_CHAN_WIDTH_80: 929 case NL80211_CHAN_WIDTH_80P80: 930 case NL80211_CHAN_WIDTH_160: 931 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */ 932 ie_len = 2 + 2 + 933 sizeof(struct ieee80211_wide_bw_chansw_ie); 934 pos = skb_put_zero(skb, ie_len); 935 936 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */ 937 *pos++ = 5; /* len */ 938 /* put sub IE */ 939 chandef = &csa->settings.chandef; 940 ieee80211_ie_build_wide_bw_cs(pos, chandef); 941 break; 942 default: 943 break; 944 } 945 } 946 rcu_read_unlock(); 947 948 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 949 mesh_add_ds_params_ie(sdata, skb)) 950 goto out_free; 951 952 bcn->head_len = skb->len; 953 memcpy(bcn->head, skb->data, bcn->head_len); 954 955 /* now the tail */ 956 skb_trim(skb, 0); 957 bcn->tail = bcn->head + bcn->head_len; 958 959 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 960 mesh_add_rsn_ie(sdata, skb) || 961 mesh_add_ht_cap_ie(sdata, skb) || 962 mesh_add_ht_oper_ie(sdata, skb) || 963 mesh_add_meshid_ie(sdata, skb) || 964 mesh_add_meshconf_ie(sdata, skb) || 965 mesh_add_awake_window_ie(sdata, skb) || 966 mesh_add_vht_cap_ie(sdata, skb) || 967 mesh_add_vht_oper_ie(sdata, skb) || 968 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) || 969 mesh_add_he_oper_ie(sdata, skb) || 970 mesh_add_he_6ghz_cap_ie(sdata, skb) || 971 mesh_add_vendor_ies(sdata, skb)) 972 goto out_free; 973 974 bcn->tail_len = skb->len; 975 memcpy(bcn->tail, skb->data, bcn->tail_len); 976 ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len); 977 bcn->meshconf = (struct ieee80211_meshconf_ie *) 978 (bcn->tail + ifmsh->meshconf_offset); 979 980 dev_kfree_skb(skb); 981 rcu_assign_pointer(ifmsh->beacon, bcn); 982 return 0; 983 out_free: 984 kfree(bcn); 985 dev_kfree_skb(skb); 986 return -ENOMEM; 987 } 988 989 static int 990 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata) 991 { 992 struct beacon_data *old_bcn; 993 int ret; 994 995 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon, 996 lockdep_is_held(&sdata->wdev.mtx)); 997 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh); 998 if (ret) 999 /* just reuse old beacon */ 1000 return ret; 1001 1002 if (old_bcn) 1003 kfree_rcu(old_bcn, rcu_head); 1004 return 0; 1005 } 1006 1007 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 1008 u32 changed) 1009 { 1010 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1011 unsigned long bits = changed; 1012 u32 bit; 1013 1014 if (!bits) 1015 return; 1016 1017 /* if we race with running work, worst case this work becomes a noop */ 1018 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE) 1019 set_bit(bit, &ifmsh->mbss_changed); 1020 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags); 1021 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1022 } 1023 1024 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 1025 { 1026 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1027 struct ieee80211_local *local = sdata->local; 1028 u32 changed = BSS_CHANGED_BEACON | 1029 BSS_CHANGED_BEACON_ENABLED | 1030 BSS_CHANGED_HT | 1031 BSS_CHANGED_BASIC_RATES | 1032 BSS_CHANGED_BEACON_INT | 1033 BSS_CHANGED_MCAST_RATE; 1034 1035 local->fif_other_bss++; 1036 /* mesh ifaces must set allmulti to forward mcast traffic */ 1037 atomic_inc(&local->iff_allmultis); 1038 ieee80211_configure_filter(local); 1039 1040 ifmsh->mesh_cc_id = 0; /* Disabled */ 1041 /* register sync ops from extensible synchronization framework */ 1042 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id); 1043 ifmsh->sync_offset_clockdrift_max = 0; 1044 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 1045 ieee80211_mesh_root_setup(ifmsh); 1046 ieee80211_queue_work(&local->hw, &sdata->work); 1047 sdata->vif.bss_conf.ht_operation_mode = 1048 ifmsh->mshcfg.ht_opmode; 1049 sdata->vif.bss_conf.enable_beacon = true; 1050 1051 changed |= ieee80211_mps_local_status_update(sdata); 1052 1053 if (ieee80211_mesh_build_beacon(ifmsh)) { 1054 ieee80211_stop_mesh(sdata); 1055 return -ENOMEM; 1056 } 1057 1058 ieee80211_recalc_dtim(local, sdata); 1059 ieee80211_bss_info_change_notify(sdata, changed); 1060 1061 netif_carrier_on(sdata->dev); 1062 return 0; 1063 } 1064 1065 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 1066 { 1067 struct ieee80211_local *local = sdata->local; 1068 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1069 struct beacon_data *bcn; 1070 1071 netif_carrier_off(sdata->dev); 1072 1073 /* flush STAs and mpaths on this iface */ 1074 sta_info_flush(sdata); 1075 ieee80211_free_keys(sdata, true); 1076 mesh_path_flush_by_iface(sdata); 1077 1078 /* stop the beacon */ 1079 ifmsh->mesh_id_len = 0; 1080 sdata->vif.bss_conf.enable_beacon = false; 1081 sdata->beacon_rate_set = false; 1082 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 1083 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); 1084 1085 /* remove beacon */ 1086 bcn = rcu_dereference_protected(ifmsh->beacon, 1087 lockdep_is_held(&sdata->wdev.mtx)); 1088 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1089 kfree_rcu(bcn, rcu_head); 1090 1091 /* free all potentially still buffered group-addressed frames */ 1092 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf); 1093 skb_queue_purge(&ifmsh->ps.bc_buf); 1094 1095 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 1096 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 1097 del_timer_sync(&sdata->u.mesh.mesh_path_timer); 1098 1099 /* clear any mesh work (for next join) we may have accrued */ 1100 ifmsh->wrkq_flags = 0; 1101 ifmsh->mbss_changed = 0; 1102 1103 local->fif_other_bss--; 1104 atomic_dec(&local->iff_allmultis); 1105 ieee80211_configure_filter(local); 1106 } 1107 1108 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 1109 { 1110 int err; 1111 1112 /* if the current channel is a DFS channel, mark the channel as 1113 * unavailable. 1114 */ 1115 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 1116 &sdata->vif.bss_conf.chandef, 1117 NL80211_IFTYPE_MESH_POINT); 1118 if (err > 0) 1119 cfg80211_radar_event(sdata->local->hw.wiphy, 1120 &sdata->vif.bss_conf.chandef, GFP_ATOMIC); 1121 } 1122 1123 static bool 1124 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata, 1125 struct ieee802_11_elems *elems, bool beacon) 1126 { 1127 struct cfg80211_csa_settings params; 1128 struct ieee80211_csa_ie csa_ie; 1129 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1130 struct ieee80211_supported_band *sband; 1131 int err; 1132 u32 sta_flags, vht_cap_info = 0; 1133 1134 sdata_assert_lock(sdata); 1135 1136 sband = ieee80211_get_sband(sdata); 1137 if (!sband) 1138 return false; 1139 1140 sta_flags = 0; 1141 switch (sdata->vif.bss_conf.chandef.width) { 1142 case NL80211_CHAN_WIDTH_20_NOHT: 1143 sta_flags |= IEEE80211_STA_DISABLE_HT; 1144 fallthrough; 1145 case NL80211_CHAN_WIDTH_20: 1146 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 1147 fallthrough; 1148 case NL80211_CHAN_WIDTH_40: 1149 sta_flags |= IEEE80211_STA_DISABLE_VHT; 1150 break; 1151 default: 1152 break; 1153 } 1154 1155 if (elems->vht_cap_elem) 1156 vht_cap_info = 1157 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1158 1159 memset(¶ms, 0, sizeof(params)); 1160 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band, 1161 vht_cap_info, 1162 sta_flags, sdata->vif.addr, 1163 &csa_ie); 1164 if (err < 0) 1165 return false; 1166 if (err) 1167 return false; 1168 1169 /* Mark the channel unavailable if the reason for the switch is 1170 * regulatory. 1171 */ 1172 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY) 1173 ieee80211_mesh_csa_mark_radar(sdata); 1174 1175 params.chandef = csa_ie.chandef; 1176 params.count = csa_ie.count; 1177 1178 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, 1179 IEEE80211_CHAN_DISABLED) || 1180 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 1181 NL80211_IFTYPE_MESH_POINT)) { 1182 sdata_info(sdata, 1183 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 1184 sdata->vif.addr, 1185 params.chandef.chan->center_freq, 1186 params.chandef.width, 1187 params.chandef.center_freq1, 1188 params.chandef.center_freq2); 1189 return false; 1190 } 1191 1192 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 1193 ¶ms.chandef, 1194 NL80211_IFTYPE_MESH_POINT); 1195 if (err < 0) 1196 return false; 1197 if (err > 0 && !ifmsh->userspace_handles_dfs) { 1198 sdata_info(sdata, 1199 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 1200 sdata->vif.addr, 1201 params.chandef.chan->center_freq, 1202 params.chandef.width, 1203 params.chandef.center_freq1, 1204 params.chandef.center_freq2); 1205 return false; 1206 } 1207 1208 params.radar_required = err; 1209 1210 if (cfg80211_chandef_identical(¶ms.chandef, 1211 &sdata->vif.bss_conf.chandef)) { 1212 mcsa_dbg(sdata, 1213 "received csa with an identical chandef, ignoring\n"); 1214 return true; 1215 } 1216 1217 mcsa_dbg(sdata, 1218 "received channel switch announcement to go to channel %d MHz\n", 1219 params.chandef.chan->center_freq); 1220 1221 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT; 1222 if (beacon) { 1223 ifmsh->chsw_ttl = csa_ie.ttl - 1; 1224 if (ifmsh->pre_value >= csa_ie.pre_value) 1225 return false; 1226 ifmsh->pre_value = csa_ie.pre_value; 1227 } 1228 1229 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) 1230 return false; 1231 1232 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; 1233 1234 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 1235 ¶ms) < 0) 1236 return false; 1237 1238 return true; 1239 } 1240 1241 static void 1242 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, 1243 struct ieee80211_mgmt *mgmt, size_t len) 1244 { 1245 struct ieee80211_local *local = sdata->local; 1246 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1247 struct sk_buff *presp; 1248 struct beacon_data *bcn; 1249 struct ieee80211_mgmt *hdr; 1250 struct ieee802_11_elems *elems; 1251 size_t baselen; 1252 u8 *pos; 1253 1254 pos = mgmt->u.probe_req.variable; 1255 baselen = (u8 *) pos - (u8 *) mgmt; 1256 if (baselen > len) 1257 return; 1258 1259 elems = ieee802_11_parse_elems(pos, len - baselen, false, mgmt->bssid, 1260 NULL); 1261 if (!elems) 1262 return; 1263 1264 if (!elems->mesh_id) 1265 goto free; 1266 1267 /* 802.11-2012 10.1.4.3.2 */ 1268 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && 1269 !is_broadcast_ether_addr(mgmt->da)) || 1270 elems->ssid_len != 0) 1271 goto free; 1272 1273 if (elems->mesh_id_len != 0 && 1274 (elems->mesh_id_len != ifmsh->mesh_id_len || 1275 memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) 1276 goto free; 1277 1278 rcu_read_lock(); 1279 bcn = rcu_dereference(ifmsh->beacon); 1280 1281 if (!bcn) 1282 goto out; 1283 1284 presp = dev_alloc_skb(local->tx_headroom + 1285 bcn->head_len + bcn->tail_len); 1286 if (!presp) 1287 goto out; 1288 1289 skb_reserve(presp, local->tx_headroom); 1290 skb_put_data(presp, bcn->head, bcn->head_len); 1291 skb_put_data(presp, bcn->tail, bcn->tail_len); 1292 hdr = (struct ieee80211_mgmt *) presp->data; 1293 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1294 IEEE80211_STYPE_PROBE_RESP); 1295 memcpy(hdr->da, mgmt->sa, ETH_ALEN); 1296 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1297 ieee80211_tx_skb(sdata, presp); 1298 out: 1299 rcu_read_unlock(); 1300 free: 1301 kfree(elems); 1302 } 1303 1304 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 1305 u16 stype, 1306 struct ieee80211_mgmt *mgmt, 1307 size_t len, 1308 struct ieee80211_rx_status *rx_status) 1309 { 1310 struct ieee80211_local *local = sdata->local; 1311 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1312 struct ieee802_11_elems *elems; 1313 struct ieee80211_channel *channel; 1314 size_t baselen; 1315 int freq; 1316 enum nl80211_band band = rx_status->band; 1317 1318 /* ignore ProbeResp to foreign address */ 1319 if (stype == IEEE80211_STYPE_PROBE_RESP && 1320 !ether_addr_equal(mgmt->da, sdata->vif.addr)) 1321 return; 1322 1323 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1324 if (baselen > len) 1325 return; 1326 1327 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1328 len - baselen, 1329 false, mgmt->bssid, NULL); 1330 if (!elems) 1331 return; 1332 1333 /* ignore non-mesh or secure / unsecure mismatch */ 1334 if ((!elems->mesh_id || !elems->mesh_config) || 1335 (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) || 1336 (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)) 1337 goto free; 1338 1339 if (elems->ds_params) 1340 freq = ieee80211_channel_to_frequency(elems->ds_params[0], band); 1341 else 1342 freq = rx_status->freq; 1343 1344 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1345 1346 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1347 goto free; 1348 1349 if (mesh_matches_local(sdata, elems)) { 1350 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n", 1351 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal); 1352 if (!sdata->u.mesh.user_mpm || 1353 sdata->u.mesh.mshcfg.rssi_threshold == 0 || 1354 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal) 1355 mesh_neighbour_update(sdata, mgmt->sa, elems, 1356 rx_status); 1357 1358 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && 1359 !sdata->vif.csa_active) 1360 ieee80211_mesh_process_chnswitch(sdata, elems, true); 1361 } 1362 1363 if (ifmsh->sync_ops) 1364 ifmsh->sync_ops->rx_bcn_presp(sdata, stype, mgmt, len, 1365 elems->mesh_config, rx_status); 1366 free: 1367 kfree(elems); 1368 } 1369 1370 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata) 1371 { 1372 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1373 struct mesh_csa_settings *tmp_csa_settings; 1374 int ret = 0; 1375 int changed = 0; 1376 1377 /* Reset the TTL value and Initiator flag */ 1378 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1379 ifmsh->chsw_ttl = 0; 1380 1381 /* Remove the CSA and MCSP elements from the beacon */ 1382 tmp_csa_settings = rcu_dereference_protected(ifmsh->csa, 1383 lockdep_is_held(&sdata->wdev.mtx)); 1384 RCU_INIT_POINTER(ifmsh->csa, NULL); 1385 if (tmp_csa_settings) 1386 kfree_rcu(tmp_csa_settings, rcu_head); 1387 ret = ieee80211_mesh_rebuild_beacon(sdata); 1388 if (ret) 1389 return -EINVAL; 1390 1391 changed |= BSS_CHANGED_BEACON; 1392 1393 mcsa_dbg(sdata, "complete switching to center freq %d MHz", 1394 sdata->vif.bss_conf.chandef.chan->center_freq); 1395 return changed; 1396 } 1397 1398 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, 1399 struct cfg80211_csa_settings *csa_settings) 1400 { 1401 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1402 struct mesh_csa_settings *tmp_csa_settings; 1403 int ret = 0; 1404 1405 lockdep_assert_held(&sdata->wdev.mtx); 1406 1407 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings), 1408 GFP_ATOMIC); 1409 if (!tmp_csa_settings) 1410 return -ENOMEM; 1411 1412 memcpy(&tmp_csa_settings->settings, csa_settings, 1413 sizeof(struct cfg80211_csa_settings)); 1414 1415 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings); 1416 1417 ret = ieee80211_mesh_rebuild_beacon(sdata); 1418 if (ret) { 1419 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1420 RCU_INIT_POINTER(ifmsh->csa, NULL); 1421 kfree_rcu(tmp_csa_settings, rcu_head); 1422 return ret; 1423 } 1424 1425 return BSS_CHANGED_BEACON; 1426 } 1427 1428 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata, 1429 struct ieee80211_mgmt *mgmt, size_t len, 1430 struct ieee802_11_elems *elems) 1431 { 1432 struct ieee80211_mgmt *mgmt_fwd; 1433 struct sk_buff *skb; 1434 struct ieee80211_local *local = sdata->local; 1435 1436 skb = dev_alloc_skb(local->tx_headroom + len); 1437 if (!skb) 1438 return -ENOMEM; 1439 skb_reserve(skb, local->tx_headroom); 1440 mgmt_fwd = skb_put(skb, len); 1441 1442 elems->mesh_chansw_params_ie->mesh_ttl--; 1443 elems->mesh_chansw_params_ie->mesh_flags &= 1444 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 1445 1446 memcpy(mgmt_fwd, mgmt, len); 1447 eth_broadcast_addr(mgmt_fwd->da); 1448 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN); 1449 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN); 1450 1451 ieee80211_tx_skb(sdata, skb); 1452 return 0; 1453 } 1454 1455 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata, 1456 struct ieee80211_mgmt *mgmt, size_t len) 1457 { 1458 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1459 struct ieee802_11_elems *elems; 1460 u16 pre_value; 1461 bool fwd_csa = true; 1462 size_t baselen; 1463 u8 *pos; 1464 1465 if (mgmt->u.action.u.measurement.action_code != 1466 WLAN_ACTION_SPCT_CHL_SWITCH) 1467 return; 1468 1469 pos = mgmt->u.action.u.chan_switch.variable; 1470 baselen = offsetof(struct ieee80211_mgmt, 1471 u.action.u.chan_switch.variable); 1472 elems = ieee802_11_parse_elems(pos, len - baselen, true, 1473 mgmt->bssid, NULL); 1474 if (!elems) 1475 return; 1476 1477 if (!mesh_matches_local(sdata, elems)) 1478 goto free; 1479 1480 ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl; 1481 if (!--ifmsh->chsw_ttl) 1482 fwd_csa = false; 1483 1484 pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value); 1485 if (ifmsh->pre_value >= pre_value) 1486 goto free; 1487 1488 ifmsh->pre_value = pre_value; 1489 1490 if (!sdata->vif.csa_active && 1491 !ieee80211_mesh_process_chnswitch(sdata, elems, false)) { 1492 mcsa_dbg(sdata, "Failed to process CSA action frame"); 1493 goto free; 1494 } 1495 1496 /* forward or re-broadcast the CSA frame */ 1497 if (fwd_csa) { 1498 if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0) 1499 mcsa_dbg(sdata, "Failed to forward the CSA frame"); 1500 } 1501 free: 1502 kfree(elems); 1503 } 1504 1505 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 1506 struct ieee80211_mgmt *mgmt, 1507 size_t len, 1508 struct ieee80211_rx_status *rx_status) 1509 { 1510 switch (mgmt->u.action.category) { 1511 case WLAN_CATEGORY_SELF_PROTECTED: 1512 switch (mgmt->u.action.u.self_prot.action_code) { 1513 case WLAN_SP_MESH_PEERING_OPEN: 1514 case WLAN_SP_MESH_PEERING_CLOSE: 1515 case WLAN_SP_MESH_PEERING_CONFIRM: 1516 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 1517 break; 1518 } 1519 break; 1520 case WLAN_CATEGORY_MESH_ACTION: 1521 if (mesh_action_is_path_sel(mgmt)) 1522 mesh_rx_path_sel_frame(sdata, mgmt, len); 1523 break; 1524 case WLAN_CATEGORY_SPECTRUM_MGMT: 1525 mesh_rx_csa_frame(sdata, mgmt, len); 1526 break; 1527 } 1528 } 1529 1530 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1531 struct sk_buff *skb) 1532 { 1533 struct ieee80211_rx_status *rx_status; 1534 struct ieee80211_mgmt *mgmt; 1535 u16 stype; 1536 1537 sdata_lock(sdata); 1538 1539 /* mesh already went down */ 1540 if (!sdata->u.mesh.mesh_id_len) 1541 goto out; 1542 1543 rx_status = IEEE80211_SKB_RXCB(skb); 1544 mgmt = (struct ieee80211_mgmt *) skb->data; 1545 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 1546 1547 switch (stype) { 1548 case IEEE80211_STYPE_PROBE_RESP: 1549 case IEEE80211_STYPE_BEACON: 1550 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 1551 rx_status); 1552 break; 1553 case IEEE80211_STYPE_PROBE_REQ: 1554 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); 1555 break; 1556 case IEEE80211_STYPE_ACTION: 1557 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 1558 break; 1559 } 1560 out: 1561 sdata_unlock(sdata); 1562 } 1563 1564 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) 1565 { 1566 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1567 u32 bit, changed = 0; 1568 1569 for_each_set_bit(bit, &ifmsh->mbss_changed, 1570 sizeof(changed) * BITS_PER_BYTE) { 1571 clear_bit(bit, &ifmsh->mbss_changed); 1572 changed |= BIT(bit); 1573 } 1574 1575 if (sdata->vif.bss_conf.enable_beacon && 1576 (changed & (BSS_CHANGED_BEACON | 1577 BSS_CHANGED_HT | 1578 BSS_CHANGED_BASIC_RATES | 1579 BSS_CHANGED_BEACON_INT))) 1580 if (ieee80211_mesh_rebuild_beacon(sdata)) 1581 return; 1582 1583 ieee80211_bss_info_change_notify(sdata, changed); 1584 } 1585 1586 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 1587 { 1588 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1589 1590 sdata_lock(sdata); 1591 1592 /* mesh already went down */ 1593 if (!sdata->u.mesh.mesh_id_len) 1594 goto out; 1595 1596 if (ifmsh->preq_queue_len && 1597 time_after(jiffies, 1598 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 1599 mesh_path_start_discovery(sdata); 1600 1601 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 1602 ieee80211_mesh_housekeeping(sdata); 1603 1604 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 1605 ieee80211_mesh_rootpath(sdata); 1606 1607 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags)) 1608 mesh_sync_adjust_tsf(sdata); 1609 1610 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) 1611 mesh_bss_info_changed(sdata); 1612 out: 1613 sdata_unlock(sdata); 1614 } 1615 1616 1617 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 1618 { 1619 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1620 static u8 zero_addr[ETH_ALEN] = {}; 1621 1622 timer_setup(&ifmsh->housekeeping_timer, 1623 ieee80211_mesh_housekeeping_timer, 0); 1624 1625 ifmsh->accepting_plinks = true; 1626 atomic_set(&ifmsh->mpaths, 0); 1627 mesh_rmc_init(sdata); 1628 ifmsh->last_preq = jiffies; 1629 ifmsh->next_perr = jiffies; 1630 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1631 /* Allocate all mesh structures when creating the first mesh interface. */ 1632 if (!mesh_allocated) 1633 ieee80211s_init(); 1634 1635 mesh_pathtbl_init(sdata); 1636 1637 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0); 1638 timer_setup(&ifmsh->mesh_path_root_timer, 1639 ieee80211_mesh_path_root_timer, 0); 1640 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 1641 skb_queue_head_init(&ifmsh->ps.bc_buf); 1642 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 1643 spin_lock_init(&ifmsh->sync_offset_lock); 1644 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1645 1646 sdata->vif.bss_conf.bssid = zero_addr; 1647 } 1648 1649 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1650 { 1651 mesh_rmc_free(sdata); 1652 mesh_pathtbl_unregister(sdata); 1653 } 1654