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 /** 671 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame 672 * @hdr: 802.11 frame header 673 * @fc: frame control field 674 * @meshda: destination address in the mesh 675 * @meshsa: source address in the mesh. Same as TA, as frame is 676 * locally originated. 677 * 678 * Return the length of the 802.11 (does not include a mesh control header) 679 */ 680 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 681 const u8 *meshda, const u8 *meshsa) 682 { 683 if (is_multicast_ether_addr(meshda)) { 684 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 685 /* DA TA SA */ 686 memcpy(hdr->addr1, meshda, ETH_ALEN); 687 memcpy(hdr->addr2, meshsa, ETH_ALEN); 688 memcpy(hdr->addr3, meshsa, ETH_ALEN); 689 return 24; 690 } else { 691 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 692 /* RA TA DA SA */ 693 eth_zero_addr(hdr->addr1); /* RA is resolved later */ 694 memcpy(hdr->addr2, meshsa, ETH_ALEN); 695 memcpy(hdr->addr3, meshda, ETH_ALEN); 696 memcpy(hdr->addr4, meshsa, ETH_ALEN); 697 return 30; 698 } 699 } 700 701 /** 702 * ieee80211_new_mesh_header - create a new mesh header 703 * @sdata: mesh interface to be used 704 * @meshhdr: uninitialized mesh header 705 * @addr4or5: 1st address in the ae header, which may correspond to address 4 706 * (if addr6 is NULL) or address 5 (if addr6 is present). It may 707 * be NULL. 708 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the 709 * mesh frame 710 * 711 * Return the header length. 712 */ 713 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 714 struct ieee80211s_hdr *meshhdr, 715 const char *addr4or5, const char *addr6) 716 { 717 if (WARN_ON(!addr4or5 && addr6)) 718 return 0; 719 720 memset(meshhdr, 0, sizeof(*meshhdr)); 721 722 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; 723 724 /* FIXME: racy -- TX on multiple queues can be concurrent */ 725 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); 726 sdata->u.mesh.mesh_seqnum++; 727 728 if (addr4or5 && !addr6) { 729 meshhdr->flags |= MESH_FLAGS_AE_A4; 730 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 731 return 2 * ETH_ALEN; 732 } else if (addr4or5 && addr6) { 733 meshhdr->flags |= MESH_FLAGS_AE_A5_A6; 734 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 735 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); 736 return 3 * ETH_ALEN; 737 } 738 739 return ETH_ALEN; 740 } 741 742 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata) 743 { 744 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 745 u32 changed; 746 747 if (ifmsh->mshcfg.plink_timeout > 0) 748 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ); 749 mesh_path_expire(sdata); 750 751 changed = mesh_accept_plinks_update(sdata); 752 ieee80211_mbss_info_change_notify(sdata, changed); 753 754 mod_timer(&ifmsh->housekeeping_timer, 755 round_jiffies(jiffies + 756 IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); 757 } 758 759 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) 760 { 761 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 762 u32 interval; 763 764 mesh_path_tx_root_frame(sdata); 765 766 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN) 767 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; 768 else 769 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval; 770 771 mod_timer(&ifmsh->mesh_path_root_timer, 772 round_jiffies(TU_TO_EXP_TIME(interval))); 773 } 774 775 static int 776 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh) 777 { 778 struct beacon_data *bcn; 779 int head_len, tail_len; 780 struct sk_buff *skb; 781 struct ieee80211_mgmt *mgmt; 782 struct ieee80211_chanctx_conf *chanctx_conf; 783 struct mesh_csa_settings *csa; 784 enum nl80211_band band; 785 u8 ie_len_he_cap; 786 u8 *pos; 787 struct ieee80211_sub_if_data *sdata; 788 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon); 789 790 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh); 791 rcu_read_lock(); 792 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 793 band = chanctx_conf->def.chan->band; 794 rcu_read_unlock(); 795 796 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata, 797 NL80211_IFTYPE_MESH_POINT); 798 head_len = hdr_len + 799 2 + /* NULL SSID */ 800 /* Channel Switch Announcement */ 801 2 + sizeof(struct ieee80211_channel_sw_ie) + 802 /* Mesh Channel Switch Parameters */ 803 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) + 804 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */ 805 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) + 806 2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 807 2 + 8 + /* supported rates */ 808 2 + 3; /* DS params */ 809 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 810 2 + sizeof(struct ieee80211_ht_cap) + 811 2 + sizeof(struct ieee80211_ht_operation) + 812 2 + ifmsh->mesh_id_len + 813 2 + sizeof(struct ieee80211_meshconf_ie) + 814 2 + sizeof(__le16) + /* awake window */ 815 2 + sizeof(struct ieee80211_vht_cap) + 816 2 + sizeof(struct ieee80211_vht_operation) + 817 ie_len_he_cap + 818 2 + 1 + sizeof(struct ieee80211_he_operation) + 819 sizeof(struct ieee80211_he_6ghz_oper) + 820 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) + 821 ifmsh->ie_len; 822 823 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL); 824 /* need an skb for IE builders to operate on */ 825 skb = dev_alloc_skb(max(head_len, tail_len)); 826 827 if (!bcn || !skb) 828 goto out_free; 829 830 /* 831 * pointers go into the block we allocated, 832 * memory is | beacon_data | head | tail | 833 */ 834 bcn->head = ((u8 *) bcn) + sizeof(*bcn); 835 836 /* fill in the head */ 837 mgmt = skb_put_zero(skb, hdr_len); 838 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 839 IEEE80211_STYPE_BEACON); 840 eth_broadcast_addr(mgmt->da); 841 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 842 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 843 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt); 844 mgmt->u.beacon.beacon_int = 845 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 846 mgmt->u.beacon.capab_info |= cpu_to_le16( 847 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 848 849 pos = skb_put(skb, 2); 850 *pos++ = WLAN_EID_SSID; 851 *pos++ = 0x0; 852 853 rcu_read_lock(); 854 csa = rcu_dereference(ifmsh->csa); 855 if (csa) { 856 enum nl80211_channel_type ct; 857 struct cfg80211_chan_def *chandef; 858 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) + 859 2 + sizeof(struct ieee80211_mesh_chansw_params_ie); 860 861 pos = skb_put_zero(skb, ie_len); 862 *pos++ = WLAN_EID_CHANNEL_SWITCH; 863 *pos++ = 3; 864 *pos++ = 0x0; 865 *pos++ = ieee80211_frequency_to_channel( 866 csa->settings.chandef.chan->center_freq); 867 bcn->cntdwn_current_counter = csa->settings.count; 868 bcn->cntdwn_counter_offsets[0] = hdr_len + 6; 869 *pos++ = csa->settings.count; 870 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; 871 *pos++ = 6; 872 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) { 873 *pos++ = ifmsh->mshcfg.dot11MeshTTL; 874 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 875 } else { 876 *pos++ = ifmsh->chsw_ttl; 877 } 878 *pos++ |= csa->settings.block_tx ? 879 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00; 880 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); 881 pos += 2; 882 put_unaligned_le16(ifmsh->pre_value, pos); 883 pos += 2; 884 885 switch (csa->settings.chandef.width) { 886 case NL80211_CHAN_WIDTH_40: 887 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 888 pos = skb_put_zero(skb, ie_len); 889 890 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */ 891 *pos++ = 1; /* len */ 892 ct = cfg80211_get_chandef_type(&csa->settings.chandef); 893 if (ct == NL80211_CHAN_HT40PLUS) 894 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE; 895 else 896 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW; 897 break; 898 case NL80211_CHAN_WIDTH_80: 899 case NL80211_CHAN_WIDTH_80P80: 900 case NL80211_CHAN_WIDTH_160: 901 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */ 902 ie_len = 2 + 2 + 903 sizeof(struct ieee80211_wide_bw_chansw_ie); 904 pos = skb_put_zero(skb, ie_len); 905 906 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */ 907 *pos++ = 5; /* len */ 908 /* put sub IE */ 909 chandef = &csa->settings.chandef; 910 ieee80211_ie_build_wide_bw_cs(pos, chandef); 911 break; 912 default: 913 break; 914 } 915 } 916 rcu_read_unlock(); 917 918 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 919 mesh_add_ds_params_ie(sdata, skb)) 920 goto out_free; 921 922 bcn->head_len = skb->len; 923 memcpy(bcn->head, skb->data, bcn->head_len); 924 925 /* now the tail */ 926 skb_trim(skb, 0); 927 bcn->tail = bcn->head + bcn->head_len; 928 929 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 930 mesh_add_rsn_ie(sdata, skb) || 931 mesh_add_ht_cap_ie(sdata, skb) || 932 mesh_add_ht_oper_ie(sdata, skb) || 933 mesh_add_meshid_ie(sdata, skb) || 934 mesh_add_meshconf_ie(sdata, skb) || 935 mesh_add_awake_window_ie(sdata, skb) || 936 mesh_add_vht_cap_ie(sdata, skb) || 937 mesh_add_vht_oper_ie(sdata, skb) || 938 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) || 939 mesh_add_he_oper_ie(sdata, skb) || 940 mesh_add_he_6ghz_cap_ie(sdata, skb) || 941 mesh_add_vendor_ies(sdata, skb)) 942 goto out_free; 943 944 bcn->tail_len = skb->len; 945 memcpy(bcn->tail, skb->data, bcn->tail_len); 946 bcn->meshconf = (struct ieee80211_meshconf_ie *) 947 (bcn->tail + ifmsh->meshconf_offset); 948 949 dev_kfree_skb(skb); 950 rcu_assign_pointer(ifmsh->beacon, bcn); 951 return 0; 952 out_free: 953 kfree(bcn); 954 dev_kfree_skb(skb); 955 return -ENOMEM; 956 } 957 958 static int 959 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata) 960 { 961 struct beacon_data *old_bcn; 962 int ret; 963 964 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon, 965 lockdep_is_held(&sdata->wdev.mtx)); 966 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh); 967 if (ret) 968 /* just reuse old beacon */ 969 return ret; 970 971 if (old_bcn) 972 kfree_rcu(old_bcn, rcu_head); 973 return 0; 974 } 975 976 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 977 u32 changed) 978 { 979 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 980 unsigned long bits = changed; 981 u32 bit; 982 983 if (!bits) 984 return; 985 986 /* if we race with running work, worst case this work becomes a noop */ 987 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE) 988 set_bit(bit, &ifmsh->mbss_changed); 989 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags); 990 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 991 } 992 993 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 994 { 995 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 996 struct ieee80211_local *local = sdata->local; 997 u32 changed = BSS_CHANGED_BEACON | 998 BSS_CHANGED_BEACON_ENABLED | 999 BSS_CHANGED_HT | 1000 BSS_CHANGED_BASIC_RATES | 1001 BSS_CHANGED_BEACON_INT | 1002 BSS_CHANGED_MCAST_RATE; 1003 1004 local->fif_other_bss++; 1005 /* mesh ifaces must set allmulti to forward mcast traffic */ 1006 atomic_inc(&local->iff_allmultis); 1007 ieee80211_configure_filter(local); 1008 1009 ifmsh->mesh_cc_id = 0; /* Disabled */ 1010 /* register sync ops from extensible synchronization framework */ 1011 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id); 1012 ifmsh->sync_offset_clockdrift_max = 0; 1013 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 1014 ieee80211_mesh_root_setup(ifmsh); 1015 ieee80211_queue_work(&local->hw, &sdata->work); 1016 sdata->vif.bss_conf.ht_operation_mode = 1017 ifmsh->mshcfg.ht_opmode; 1018 sdata->vif.bss_conf.enable_beacon = true; 1019 1020 changed |= ieee80211_mps_local_status_update(sdata); 1021 1022 if (ieee80211_mesh_build_beacon(ifmsh)) { 1023 ieee80211_stop_mesh(sdata); 1024 return -ENOMEM; 1025 } 1026 1027 ieee80211_recalc_dtim(local, sdata); 1028 ieee80211_bss_info_change_notify(sdata, changed); 1029 1030 netif_carrier_on(sdata->dev); 1031 return 0; 1032 } 1033 1034 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 1035 { 1036 struct ieee80211_local *local = sdata->local; 1037 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1038 struct beacon_data *bcn; 1039 1040 netif_carrier_off(sdata->dev); 1041 1042 /* flush STAs and mpaths on this iface */ 1043 sta_info_flush(sdata); 1044 ieee80211_free_keys(sdata, true); 1045 mesh_path_flush_by_iface(sdata); 1046 1047 /* stop the beacon */ 1048 ifmsh->mesh_id_len = 0; 1049 sdata->vif.bss_conf.enable_beacon = false; 1050 sdata->beacon_rate_set = false; 1051 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 1052 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); 1053 1054 /* remove beacon */ 1055 bcn = rcu_dereference_protected(ifmsh->beacon, 1056 lockdep_is_held(&sdata->wdev.mtx)); 1057 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1058 kfree_rcu(bcn, rcu_head); 1059 1060 /* free all potentially still buffered group-addressed frames */ 1061 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf); 1062 skb_queue_purge(&ifmsh->ps.bc_buf); 1063 1064 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 1065 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 1066 del_timer_sync(&sdata->u.mesh.mesh_path_timer); 1067 1068 /* clear any mesh work (for next join) we may have accrued */ 1069 ifmsh->wrkq_flags = 0; 1070 ifmsh->mbss_changed = 0; 1071 1072 local->fif_other_bss--; 1073 atomic_dec(&local->iff_allmultis); 1074 ieee80211_configure_filter(local); 1075 } 1076 1077 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 1078 { 1079 int err; 1080 1081 /* if the current channel is a DFS channel, mark the channel as 1082 * unavailable. 1083 */ 1084 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 1085 &sdata->vif.bss_conf.chandef, 1086 NL80211_IFTYPE_MESH_POINT); 1087 if (err > 0) 1088 cfg80211_radar_event(sdata->local->hw.wiphy, 1089 &sdata->vif.bss_conf.chandef, GFP_ATOMIC); 1090 } 1091 1092 static bool 1093 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata, 1094 struct ieee802_11_elems *elems, bool beacon) 1095 { 1096 struct cfg80211_csa_settings params; 1097 struct ieee80211_csa_ie csa_ie; 1098 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1099 struct ieee80211_supported_band *sband; 1100 int err; 1101 u32 sta_flags, vht_cap_info = 0; 1102 1103 sdata_assert_lock(sdata); 1104 1105 sband = ieee80211_get_sband(sdata); 1106 if (!sband) 1107 return false; 1108 1109 sta_flags = 0; 1110 switch (sdata->vif.bss_conf.chandef.width) { 1111 case NL80211_CHAN_WIDTH_20_NOHT: 1112 sta_flags |= IEEE80211_STA_DISABLE_HT; 1113 fallthrough; 1114 case NL80211_CHAN_WIDTH_20: 1115 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 1116 fallthrough; 1117 case NL80211_CHAN_WIDTH_40: 1118 sta_flags |= IEEE80211_STA_DISABLE_VHT; 1119 break; 1120 default: 1121 break; 1122 } 1123 1124 if (elems->vht_cap_elem) 1125 vht_cap_info = 1126 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1127 1128 memset(¶ms, 0, sizeof(params)); 1129 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band, 1130 vht_cap_info, 1131 sta_flags, sdata->vif.addr, 1132 &csa_ie); 1133 if (err < 0) 1134 return false; 1135 if (err) 1136 return false; 1137 1138 /* Mark the channel unavailable if the reason for the switch is 1139 * regulatory. 1140 */ 1141 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY) 1142 ieee80211_mesh_csa_mark_radar(sdata); 1143 1144 params.chandef = csa_ie.chandef; 1145 params.count = csa_ie.count; 1146 1147 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, 1148 IEEE80211_CHAN_DISABLED) || 1149 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 1150 NL80211_IFTYPE_MESH_POINT)) { 1151 sdata_info(sdata, 1152 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 1153 sdata->vif.addr, 1154 params.chandef.chan->center_freq, 1155 params.chandef.width, 1156 params.chandef.center_freq1, 1157 params.chandef.center_freq2); 1158 return false; 1159 } 1160 1161 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 1162 ¶ms.chandef, 1163 NL80211_IFTYPE_MESH_POINT); 1164 if (err < 0) 1165 return false; 1166 if (err > 0 && !ifmsh->userspace_handles_dfs) { 1167 sdata_info(sdata, 1168 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 1169 sdata->vif.addr, 1170 params.chandef.chan->center_freq, 1171 params.chandef.width, 1172 params.chandef.center_freq1, 1173 params.chandef.center_freq2); 1174 return false; 1175 } 1176 1177 params.radar_required = err; 1178 1179 if (cfg80211_chandef_identical(¶ms.chandef, 1180 &sdata->vif.bss_conf.chandef)) { 1181 mcsa_dbg(sdata, 1182 "received csa with an identical chandef, ignoring\n"); 1183 return true; 1184 } 1185 1186 mcsa_dbg(sdata, 1187 "received channel switch announcement to go to channel %d MHz\n", 1188 params.chandef.chan->center_freq); 1189 1190 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT; 1191 if (beacon) { 1192 ifmsh->chsw_ttl = csa_ie.ttl - 1; 1193 if (ifmsh->pre_value >= csa_ie.pre_value) 1194 return false; 1195 ifmsh->pre_value = csa_ie.pre_value; 1196 } 1197 1198 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) 1199 return false; 1200 1201 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; 1202 1203 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 1204 ¶ms) < 0) 1205 return false; 1206 1207 return true; 1208 } 1209 1210 static void 1211 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, 1212 struct ieee80211_mgmt *mgmt, size_t len) 1213 { 1214 struct ieee80211_local *local = sdata->local; 1215 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1216 struct sk_buff *presp; 1217 struct beacon_data *bcn; 1218 struct ieee80211_mgmt *hdr; 1219 struct ieee802_11_elems elems; 1220 size_t baselen; 1221 u8 *pos; 1222 1223 pos = mgmt->u.probe_req.variable; 1224 baselen = (u8 *) pos - (u8 *) mgmt; 1225 if (baselen > len) 1226 return; 1227 1228 ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid, 1229 NULL); 1230 1231 if (!elems.mesh_id) 1232 return; 1233 1234 /* 802.11-2012 10.1.4.3.2 */ 1235 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && 1236 !is_broadcast_ether_addr(mgmt->da)) || 1237 elems.ssid_len != 0) 1238 return; 1239 1240 if (elems.mesh_id_len != 0 && 1241 (elems.mesh_id_len != ifmsh->mesh_id_len || 1242 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) 1243 return; 1244 1245 rcu_read_lock(); 1246 bcn = rcu_dereference(ifmsh->beacon); 1247 1248 if (!bcn) 1249 goto out; 1250 1251 presp = dev_alloc_skb(local->tx_headroom + 1252 bcn->head_len + bcn->tail_len); 1253 if (!presp) 1254 goto out; 1255 1256 skb_reserve(presp, local->tx_headroom); 1257 skb_put_data(presp, bcn->head, bcn->head_len); 1258 skb_put_data(presp, bcn->tail, bcn->tail_len); 1259 hdr = (struct ieee80211_mgmt *) presp->data; 1260 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1261 IEEE80211_STYPE_PROBE_RESP); 1262 memcpy(hdr->da, mgmt->sa, ETH_ALEN); 1263 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1264 ieee80211_tx_skb(sdata, presp); 1265 out: 1266 rcu_read_unlock(); 1267 } 1268 1269 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 1270 u16 stype, 1271 struct ieee80211_mgmt *mgmt, 1272 size_t len, 1273 struct ieee80211_rx_status *rx_status) 1274 { 1275 struct ieee80211_local *local = sdata->local; 1276 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1277 struct ieee802_11_elems elems; 1278 struct ieee80211_channel *channel; 1279 size_t baselen; 1280 int freq; 1281 enum nl80211_band band = rx_status->band; 1282 1283 /* ignore ProbeResp to foreign address */ 1284 if (stype == IEEE80211_STYPE_PROBE_RESP && 1285 !ether_addr_equal(mgmt->da, sdata->vif.addr)) 1286 return; 1287 1288 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1289 if (baselen > len) 1290 return; 1291 1292 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1293 false, &elems, mgmt->bssid, NULL); 1294 1295 /* ignore non-mesh or secure / unsecure mismatch */ 1296 if ((!elems.mesh_id || !elems.mesh_config) || 1297 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) || 1298 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)) 1299 return; 1300 1301 if (elems.ds_params) 1302 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band); 1303 else 1304 freq = rx_status->freq; 1305 1306 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1307 1308 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1309 return; 1310 1311 if (mesh_matches_local(sdata, &elems)) { 1312 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n", 1313 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal); 1314 if (!sdata->u.mesh.user_mpm || 1315 sdata->u.mesh.mshcfg.rssi_threshold == 0 || 1316 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal) 1317 mesh_neighbour_update(sdata, mgmt->sa, &elems, 1318 rx_status); 1319 1320 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && 1321 !sdata->vif.csa_active) 1322 ieee80211_mesh_process_chnswitch(sdata, &elems, true); 1323 } 1324 1325 if (ifmsh->sync_ops) 1326 ifmsh->sync_ops->rx_bcn_presp(sdata, 1327 stype, mgmt, &elems, rx_status); 1328 } 1329 1330 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata) 1331 { 1332 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1333 struct mesh_csa_settings *tmp_csa_settings; 1334 int ret = 0; 1335 int changed = 0; 1336 1337 /* Reset the TTL value and Initiator flag */ 1338 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1339 ifmsh->chsw_ttl = 0; 1340 1341 /* Remove the CSA and MCSP elements from the beacon */ 1342 tmp_csa_settings = rcu_dereference_protected(ifmsh->csa, 1343 lockdep_is_held(&sdata->wdev.mtx)); 1344 RCU_INIT_POINTER(ifmsh->csa, NULL); 1345 if (tmp_csa_settings) 1346 kfree_rcu(tmp_csa_settings, rcu_head); 1347 ret = ieee80211_mesh_rebuild_beacon(sdata); 1348 if (ret) 1349 return -EINVAL; 1350 1351 changed |= BSS_CHANGED_BEACON; 1352 1353 mcsa_dbg(sdata, "complete switching to center freq %d MHz", 1354 sdata->vif.bss_conf.chandef.chan->center_freq); 1355 return changed; 1356 } 1357 1358 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, 1359 struct cfg80211_csa_settings *csa_settings) 1360 { 1361 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1362 struct mesh_csa_settings *tmp_csa_settings; 1363 int ret = 0; 1364 1365 lockdep_assert_held(&sdata->wdev.mtx); 1366 1367 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings), 1368 GFP_ATOMIC); 1369 if (!tmp_csa_settings) 1370 return -ENOMEM; 1371 1372 memcpy(&tmp_csa_settings->settings, csa_settings, 1373 sizeof(struct cfg80211_csa_settings)); 1374 1375 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings); 1376 1377 ret = ieee80211_mesh_rebuild_beacon(sdata); 1378 if (ret) { 1379 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1380 RCU_INIT_POINTER(ifmsh->csa, NULL); 1381 kfree_rcu(tmp_csa_settings, rcu_head); 1382 return ret; 1383 } 1384 1385 return BSS_CHANGED_BEACON; 1386 } 1387 1388 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata, 1389 struct ieee80211_mgmt *mgmt, size_t len, 1390 struct ieee802_11_elems *elems) 1391 { 1392 struct ieee80211_mgmt *mgmt_fwd; 1393 struct sk_buff *skb; 1394 struct ieee80211_local *local = sdata->local; 1395 1396 skb = dev_alloc_skb(local->tx_headroom + len); 1397 if (!skb) 1398 return -ENOMEM; 1399 skb_reserve(skb, local->tx_headroom); 1400 mgmt_fwd = skb_put(skb, len); 1401 1402 elems->mesh_chansw_params_ie->mesh_ttl--; 1403 elems->mesh_chansw_params_ie->mesh_flags &= 1404 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 1405 1406 memcpy(mgmt_fwd, mgmt, len); 1407 eth_broadcast_addr(mgmt_fwd->da); 1408 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN); 1409 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN); 1410 1411 ieee80211_tx_skb(sdata, skb); 1412 return 0; 1413 } 1414 1415 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata, 1416 struct ieee80211_mgmt *mgmt, size_t len) 1417 { 1418 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1419 struct ieee802_11_elems elems; 1420 u16 pre_value; 1421 bool fwd_csa = true; 1422 size_t baselen; 1423 u8 *pos; 1424 1425 if (mgmt->u.action.u.measurement.action_code != 1426 WLAN_ACTION_SPCT_CHL_SWITCH) 1427 return; 1428 1429 pos = mgmt->u.action.u.chan_switch.variable; 1430 baselen = offsetof(struct ieee80211_mgmt, 1431 u.action.u.chan_switch.variable); 1432 ieee802_11_parse_elems(pos, len - baselen, true, &elems, 1433 mgmt->bssid, NULL); 1434 1435 if (!mesh_matches_local(sdata, &elems)) 1436 return; 1437 1438 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl; 1439 if (!--ifmsh->chsw_ttl) 1440 fwd_csa = false; 1441 1442 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value); 1443 if (ifmsh->pre_value >= pre_value) 1444 return; 1445 1446 ifmsh->pre_value = pre_value; 1447 1448 if (!sdata->vif.csa_active && 1449 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) { 1450 mcsa_dbg(sdata, "Failed to process CSA action frame"); 1451 return; 1452 } 1453 1454 /* forward or re-broadcast the CSA frame */ 1455 if (fwd_csa) { 1456 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0) 1457 mcsa_dbg(sdata, "Failed to forward the CSA frame"); 1458 } 1459 } 1460 1461 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 1462 struct ieee80211_mgmt *mgmt, 1463 size_t len, 1464 struct ieee80211_rx_status *rx_status) 1465 { 1466 switch (mgmt->u.action.category) { 1467 case WLAN_CATEGORY_SELF_PROTECTED: 1468 switch (mgmt->u.action.u.self_prot.action_code) { 1469 case WLAN_SP_MESH_PEERING_OPEN: 1470 case WLAN_SP_MESH_PEERING_CLOSE: 1471 case WLAN_SP_MESH_PEERING_CONFIRM: 1472 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 1473 break; 1474 } 1475 break; 1476 case WLAN_CATEGORY_MESH_ACTION: 1477 if (mesh_action_is_path_sel(mgmt)) 1478 mesh_rx_path_sel_frame(sdata, mgmt, len); 1479 break; 1480 case WLAN_CATEGORY_SPECTRUM_MGMT: 1481 mesh_rx_csa_frame(sdata, mgmt, len); 1482 break; 1483 } 1484 } 1485 1486 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1487 struct sk_buff *skb) 1488 { 1489 struct ieee80211_rx_status *rx_status; 1490 struct ieee80211_mgmt *mgmt; 1491 u16 stype; 1492 1493 sdata_lock(sdata); 1494 1495 /* mesh already went down */ 1496 if (!sdata->u.mesh.mesh_id_len) 1497 goto out; 1498 1499 rx_status = IEEE80211_SKB_RXCB(skb); 1500 mgmt = (struct ieee80211_mgmt *) skb->data; 1501 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 1502 1503 switch (stype) { 1504 case IEEE80211_STYPE_PROBE_RESP: 1505 case IEEE80211_STYPE_BEACON: 1506 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 1507 rx_status); 1508 break; 1509 case IEEE80211_STYPE_PROBE_REQ: 1510 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); 1511 break; 1512 case IEEE80211_STYPE_ACTION: 1513 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 1514 break; 1515 } 1516 out: 1517 sdata_unlock(sdata); 1518 } 1519 1520 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) 1521 { 1522 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1523 u32 bit, changed = 0; 1524 1525 for_each_set_bit(bit, &ifmsh->mbss_changed, 1526 sizeof(changed) * BITS_PER_BYTE) { 1527 clear_bit(bit, &ifmsh->mbss_changed); 1528 changed |= BIT(bit); 1529 } 1530 1531 if (sdata->vif.bss_conf.enable_beacon && 1532 (changed & (BSS_CHANGED_BEACON | 1533 BSS_CHANGED_HT | 1534 BSS_CHANGED_BASIC_RATES | 1535 BSS_CHANGED_BEACON_INT))) 1536 if (ieee80211_mesh_rebuild_beacon(sdata)) 1537 return; 1538 1539 ieee80211_bss_info_change_notify(sdata, changed); 1540 } 1541 1542 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 1543 { 1544 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1545 1546 sdata_lock(sdata); 1547 1548 /* mesh already went down */ 1549 if (!sdata->u.mesh.mesh_id_len) 1550 goto out; 1551 1552 if (ifmsh->preq_queue_len && 1553 time_after(jiffies, 1554 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 1555 mesh_path_start_discovery(sdata); 1556 1557 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 1558 ieee80211_mesh_housekeeping(sdata); 1559 1560 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 1561 ieee80211_mesh_rootpath(sdata); 1562 1563 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags)) 1564 mesh_sync_adjust_tsf(sdata); 1565 1566 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) 1567 mesh_bss_info_changed(sdata); 1568 out: 1569 sdata_unlock(sdata); 1570 } 1571 1572 1573 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 1574 { 1575 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1576 static u8 zero_addr[ETH_ALEN] = {}; 1577 1578 timer_setup(&ifmsh->housekeeping_timer, 1579 ieee80211_mesh_housekeeping_timer, 0); 1580 1581 ifmsh->accepting_plinks = true; 1582 atomic_set(&ifmsh->mpaths, 0); 1583 mesh_rmc_init(sdata); 1584 ifmsh->last_preq = jiffies; 1585 ifmsh->next_perr = jiffies; 1586 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1587 /* Allocate all mesh structures when creating the first mesh interface. */ 1588 if (!mesh_allocated) 1589 ieee80211s_init(); 1590 1591 mesh_pathtbl_init(sdata); 1592 1593 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0); 1594 timer_setup(&ifmsh->mesh_path_root_timer, 1595 ieee80211_mesh_path_root_timer, 0); 1596 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 1597 skb_queue_head_init(&ifmsh->ps.bc_buf); 1598 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 1599 spin_lock_init(&ifmsh->sync_offset_lock); 1600 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1601 1602 sdata->vif.bss_conf.bssid = zero_addr; 1603 } 1604 1605 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1606 { 1607 mesh_rmc_free(sdata); 1608 mesh_pathtbl_unregister(sdata); 1609 } 1610