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