1 /* 2 * Copyright (c) 2008, 2009 open80211s Ltd. 3 * Copyright (C) 2018 - 2019 Intel Corporation 4 * Authors: Luis Carlos Cobo <luisca@cozybit.com> 5 * Javier Cardona <javier@cozybit.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/slab.h> 13 #include <asm/unaligned.h> 14 #include "ieee80211_i.h" 15 #include "mesh.h" 16 #include "driver-ops.h" 17 18 static int mesh_allocated; 19 static struct kmem_cache *rm_cache; 20 21 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt) 22 { 23 return (mgmt->u.action.u.mesh_action.action_code == 24 WLAN_MESH_ACTION_HWMP_PATH_SELECTION); 25 } 26 27 void ieee80211s_init(void) 28 { 29 mesh_allocated = 1; 30 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry), 31 0, 0, NULL); 32 } 33 34 void ieee80211s_stop(void) 35 { 36 if (!mesh_allocated) 37 return; 38 kmem_cache_destroy(rm_cache); 39 } 40 41 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t) 42 { 43 struct ieee80211_sub_if_data *sdata = 44 from_timer(sdata, t, u.mesh.housekeeping_timer); 45 struct ieee80211_local *local = sdata->local; 46 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 47 48 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 49 50 ieee80211_queue_work(&local->hw, &sdata->work); 51 } 52 53 /** 54 * mesh_matches_local - check if the config of a mesh point matches ours 55 * 56 * @sdata: local mesh subif 57 * @ie: information elements of a management frame from the mesh peer 58 * 59 * This function checks if the mesh configuration of a mesh point matches the 60 * local mesh configuration, i.e. if both nodes belong to the same mesh network. 61 */ 62 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata, 63 struct ieee802_11_elems *ie) 64 { 65 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 66 u32 basic_rates = 0; 67 struct cfg80211_chan_def sta_chan_def; 68 struct ieee80211_supported_band *sband; 69 70 /* 71 * As support for each feature is added, check for matching 72 * - On mesh config capabilities 73 * - Power Save Support En 74 * - Sync support enabled 75 * - Sync support active 76 * - Sync support required from peer 77 * - MDA enabled 78 * - Power management control on fc 79 */ 80 if (!(ifmsh->mesh_id_len == ie->mesh_id_len && 81 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 && 82 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) && 83 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) && 84 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) && 85 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) && 86 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))) 87 return false; 88 89 sband = ieee80211_get_sband(sdata); 90 if (!sband) 91 return false; 92 93 ieee80211_sta_get_rates(sdata, ie, sband->band, 94 &basic_rates); 95 96 if (sdata->vif.bss_conf.basic_rates != basic_rates) 97 return false; 98 99 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan, 100 NL80211_CHAN_NO_HT); 101 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def); 102 ieee80211_chandef_vht_oper(&sdata->local->hw, 103 ie->vht_operation, ie->ht_operation, 104 &sta_chan_def); 105 106 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef, 107 &sta_chan_def)) 108 return false; 109 110 return true; 111 } 112 113 /** 114 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links 115 * 116 * @ie: information elements of a management frame from the mesh peer 117 */ 118 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) 119 { 120 return (ie->mesh_config->meshconf_cap & 121 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0; 122 } 123 124 /** 125 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons 126 * 127 * @sdata: mesh interface in which mesh beacons are going to be updated 128 * 129 * Returns: beacon changed flag if the beacon content changed. 130 */ 131 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) 132 { 133 bool free_plinks; 134 u32 changed = 0; 135 136 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, 137 * the mesh interface might be able to establish plinks with peers that 138 * are already on the table but are not on PLINK_ESTAB state. However, 139 * in general the mesh interface is not accepting peer link requests 140 * from new peers, and that must be reflected in the beacon 141 */ 142 free_plinks = mesh_plink_availables(sdata); 143 144 if (free_plinks != sdata->u.mesh.accepting_plinks) { 145 sdata->u.mesh.accepting_plinks = free_plinks; 146 changed = BSS_CHANGED_BEACON; 147 } 148 149 return changed; 150 } 151 152 /* 153 * mesh_sta_cleanup - clean up any mesh sta state 154 * 155 * @sta: mesh sta to clean up. 156 */ 157 void mesh_sta_cleanup(struct sta_info *sta) 158 { 159 struct ieee80211_sub_if_data *sdata = sta->sdata; 160 u32 changed = mesh_plink_deactivate(sta); 161 162 if (changed) 163 ieee80211_mbss_info_change_notify(sdata, changed); 164 } 165 166 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) 167 { 168 int i; 169 170 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); 171 if (!sdata->u.mesh.rmc) 172 return -ENOMEM; 173 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; 174 for (i = 0; i < RMC_BUCKETS; i++) 175 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]); 176 return 0; 177 } 178 179 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) 180 { 181 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 182 struct rmc_entry *p; 183 struct hlist_node *n; 184 int i; 185 186 if (!sdata->u.mesh.rmc) 187 return; 188 189 for (i = 0; i < RMC_BUCKETS; i++) { 190 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) { 191 hlist_del(&p->list); 192 kmem_cache_free(rm_cache, p); 193 } 194 } 195 196 kfree(rmc); 197 sdata->u.mesh.rmc = NULL; 198 } 199 200 /** 201 * mesh_rmc_check - Check frame in recent multicast cache and add if absent. 202 * 203 * @sdata: interface 204 * @sa: source address 205 * @mesh_hdr: mesh_header 206 * 207 * Returns: 0 if the frame is not in the cache, nonzero otherwise. 208 * 209 * Checks using the source address and the mesh sequence number if we have 210 * received this frame lately. If the frame is not in the cache, it is added to 211 * it. 212 */ 213 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 214 const u8 *sa, struct ieee80211s_hdr *mesh_hdr) 215 { 216 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 217 u32 seqnum = 0; 218 int entries = 0; 219 u8 idx; 220 struct rmc_entry *p; 221 struct hlist_node *n; 222 223 if (!rmc) 224 return -1; 225 226 /* Don't care about endianness since only match matters */ 227 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); 228 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; 229 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) { 230 ++entries; 231 if (time_after(jiffies, p->exp_time) || 232 entries == RMC_QUEUE_MAX_LEN) { 233 hlist_del(&p->list); 234 kmem_cache_free(rm_cache, p); 235 --entries; 236 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa)) 237 return -1; 238 } 239 240 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); 241 if (!p) 242 return 0; 243 244 p->seqnum = seqnum; 245 p->exp_time = jiffies + RMC_TIMEOUT; 246 memcpy(p->sa, sa, ETH_ALEN); 247 hlist_add_head(&p->list, &rmc->bucket[idx]); 248 return 0; 249 } 250 251 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 252 struct sk_buff *skb) 253 { 254 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 255 u8 *pos, neighbors; 256 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie); 257 bool is_connected_to_gate = ifmsh->num_gates > 0 || 258 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol || 259 ifmsh->mshcfg.dot11MeshConnectedToMeshGate; 260 261 if (skb_tailroom(skb) < 2 + meshconf_len) 262 return -ENOMEM; 263 264 pos = skb_put(skb, 2 + meshconf_len); 265 *pos++ = WLAN_EID_MESH_CONFIG; 266 *pos++ = meshconf_len; 267 268 /* save a pointer for quick updates in pre-tbtt */ 269 ifmsh->meshconf_offset = pos - skb->data; 270 271 /* Active path selection protocol ID */ 272 *pos++ = ifmsh->mesh_pp_id; 273 /* Active path selection metric ID */ 274 *pos++ = ifmsh->mesh_pm_id; 275 /* Congestion control mode identifier */ 276 *pos++ = ifmsh->mesh_cc_id; 277 /* Synchronization protocol identifier */ 278 *pos++ = ifmsh->mesh_sp_id; 279 /* Authentication Protocol identifier */ 280 *pos++ = ifmsh->mesh_auth_id; 281 /* Mesh Formation Info - number of neighbors */ 282 neighbors = atomic_read(&ifmsh->estab_plinks); 283 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS); 284 *pos++ = (neighbors << 1) | is_connected_to_gate; 285 /* Mesh capability */ 286 *pos = 0x00; 287 *pos |= ifmsh->mshcfg.dot11MeshForwarding ? 288 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00; 289 *pos |= ifmsh->accepting_plinks ? 290 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; 291 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */ 292 *pos |= ifmsh->ps_peers_deep_sleep ? 293 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00; 294 return 0; 295 } 296 297 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 298 { 299 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 300 u8 *pos; 301 302 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len) 303 return -ENOMEM; 304 305 pos = skb_put(skb, 2 + ifmsh->mesh_id_len); 306 *pos++ = WLAN_EID_MESH_ID; 307 *pos++ = ifmsh->mesh_id_len; 308 if (ifmsh->mesh_id_len) 309 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len); 310 311 return 0; 312 } 313 314 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata, 315 struct sk_buff *skb) 316 { 317 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 318 u8 *pos; 319 320 /* see IEEE802.11-2012 13.14.6 */ 321 if (ifmsh->ps_peers_light_sleep == 0 && 322 ifmsh->ps_peers_deep_sleep == 0 && 323 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE) 324 return 0; 325 326 if (skb_tailroom(skb) < 4) 327 return -ENOMEM; 328 329 pos = skb_put(skb, 2 + 2); 330 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW; 331 *pos++ = 2; 332 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos); 333 334 return 0; 335 } 336 337 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 338 struct sk_buff *skb) 339 { 340 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 341 u8 offset, len; 342 const u8 *data; 343 344 if (!ifmsh->ie || !ifmsh->ie_len) 345 return 0; 346 347 /* fast-forward to vendor IEs */ 348 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0); 349 350 if (offset < ifmsh->ie_len) { 351 len = ifmsh->ie_len - offset; 352 data = ifmsh->ie + offset; 353 if (skb_tailroom(skb) < len) 354 return -ENOMEM; 355 skb_put_data(skb, data, len); 356 } 357 358 return 0; 359 } 360 361 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 362 { 363 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 364 u8 len = 0; 365 const u8 *data; 366 367 if (!ifmsh->ie || !ifmsh->ie_len) 368 return 0; 369 370 /* find RSN IE */ 371 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len); 372 if (!data) 373 return 0; 374 375 len = data[1] + 2; 376 377 if (skb_tailroom(skb) < len) 378 return -ENOMEM; 379 skb_put_data(skb, data, len); 380 381 return 0; 382 } 383 384 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata, 385 struct sk_buff *skb) 386 { 387 struct ieee80211_chanctx_conf *chanctx_conf; 388 struct ieee80211_channel *chan; 389 u8 *pos; 390 391 if (skb_tailroom(skb) < 3) 392 return -ENOMEM; 393 394 rcu_read_lock(); 395 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 396 if (WARN_ON(!chanctx_conf)) { 397 rcu_read_unlock(); 398 return -EINVAL; 399 } 400 chan = chanctx_conf->def.chan; 401 rcu_read_unlock(); 402 403 pos = skb_put(skb, 2 + 1); 404 *pos++ = WLAN_EID_DS_PARAMS; 405 *pos++ = 1; 406 *pos++ = ieee80211_frequency_to_channel(chan->center_freq); 407 408 return 0; 409 } 410 411 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 412 struct sk_buff *skb) 413 { 414 struct ieee80211_supported_band *sband; 415 u8 *pos; 416 417 sband = ieee80211_get_sband(sdata); 418 if (!sband) 419 return -EINVAL; 420 421 if (!sband->ht_cap.ht_supported || 422 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 423 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 424 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 425 return 0; 426 427 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap)) 428 return -ENOMEM; 429 430 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap)); 431 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap); 432 433 return 0; 434 } 435 436 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 437 struct sk_buff *skb) 438 { 439 struct ieee80211_local *local = sdata->local; 440 struct ieee80211_chanctx_conf *chanctx_conf; 441 struct ieee80211_channel *channel; 442 struct ieee80211_supported_band *sband; 443 struct ieee80211_sta_ht_cap *ht_cap; 444 u8 *pos; 445 446 rcu_read_lock(); 447 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 448 if (WARN_ON(!chanctx_conf)) { 449 rcu_read_unlock(); 450 return -EINVAL; 451 } 452 channel = chanctx_conf->def.chan; 453 rcu_read_unlock(); 454 455 sband = local->hw.wiphy->bands[channel->band]; 456 ht_cap = &sband->ht_cap; 457 458 if (!ht_cap->ht_supported || 459 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 460 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 461 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 462 return 0; 463 464 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation)) 465 return -ENOMEM; 466 467 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 468 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef, 469 sdata->vif.bss_conf.ht_operation_mode, 470 false); 471 472 return 0; 473 } 474 475 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, 476 struct sk_buff *skb) 477 { 478 struct ieee80211_supported_band *sband; 479 u8 *pos; 480 481 sband = ieee80211_get_sband(sdata); 482 if (!sband) 483 return -EINVAL; 484 485 if (!sband->vht_cap.vht_supported || 486 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 487 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 488 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 489 return 0; 490 491 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap)) 492 return -ENOMEM; 493 494 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap)); 495 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap); 496 497 return 0; 498 } 499 500 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, 501 struct sk_buff *skb) 502 { 503 struct ieee80211_local *local = sdata->local; 504 struct ieee80211_chanctx_conf *chanctx_conf; 505 struct ieee80211_channel *channel; 506 struct ieee80211_supported_band *sband; 507 struct ieee80211_sta_vht_cap *vht_cap; 508 u8 *pos; 509 510 rcu_read_lock(); 511 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 512 if (WARN_ON(!chanctx_conf)) { 513 rcu_read_unlock(); 514 return -EINVAL; 515 } 516 channel = chanctx_conf->def.chan; 517 rcu_read_unlock(); 518 519 sband = local->hw.wiphy->bands[channel->band]; 520 vht_cap = &sband->vht_cap; 521 522 if (!vht_cap->vht_supported || 523 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 524 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 525 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 526 return 0; 527 528 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation)) 529 return -ENOMEM; 530 531 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 532 ieee80211_ie_build_vht_oper(pos, vht_cap, 533 &sdata->vif.bss_conf.chandef); 534 535 return 0; 536 } 537 538 static void ieee80211_mesh_path_timer(struct timer_list *t) 539 { 540 struct ieee80211_sub_if_data *sdata = 541 from_timer(sdata, t, u.mesh.mesh_path_timer); 542 543 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 544 } 545 546 static void ieee80211_mesh_path_root_timer(struct timer_list *t) 547 { 548 struct ieee80211_sub_if_data *sdata = 549 from_timer(sdata, t, u.mesh.mesh_path_root_timer); 550 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 551 552 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 553 554 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 555 } 556 557 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh) 558 { 559 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT) 560 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 561 else { 562 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 563 /* stop running timer */ 564 del_timer_sync(&ifmsh->mesh_path_root_timer); 565 } 566 } 567 568 /** 569 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame 570 * @hdr: 802.11 frame header 571 * @fc: frame control field 572 * @meshda: destination address in the mesh 573 * @meshsa: source address address in the mesh. Same as TA, as frame is 574 * locally originated. 575 * 576 * Return the length of the 802.11 (does not include a mesh control header) 577 */ 578 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 579 const u8 *meshda, const u8 *meshsa) 580 { 581 if (is_multicast_ether_addr(meshda)) { 582 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 583 /* DA TA SA */ 584 memcpy(hdr->addr1, meshda, ETH_ALEN); 585 memcpy(hdr->addr2, meshsa, ETH_ALEN); 586 memcpy(hdr->addr3, meshsa, ETH_ALEN); 587 return 24; 588 } else { 589 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 590 /* RA TA DA SA */ 591 eth_zero_addr(hdr->addr1); /* RA is resolved later */ 592 memcpy(hdr->addr2, meshsa, ETH_ALEN); 593 memcpy(hdr->addr3, meshda, ETH_ALEN); 594 memcpy(hdr->addr4, meshsa, ETH_ALEN); 595 return 30; 596 } 597 } 598 599 /** 600 * ieee80211_new_mesh_header - create a new mesh header 601 * @sdata: mesh interface to be used 602 * @meshhdr: uninitialized mesh header 603 * @addr4or5: 1st address in the ae header, which may correspond to address 4 604 * (if addr6 is NULL) or address 5 (if addr6 is present). It may 605 * be NULL. 606 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the 607 * mesh frame 608 * 609 * Return the header length. 610 */ 611 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 612 struct ieee80211s_hdr *meshhdr, 613 const char *addr4or5, const char *addr6) 614 { 615 if (WARN_ON(!addr4or5 && addr6)) 616 return 0; 617 618 memset(meshhdr, 0, sizeof(*meshhdr)); 619 620 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; 621 622 /* FIXME: racy -- TX on multiple queues can be concurrent */ 623 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); 624 sdata->u.mesh.mesh_seqnum++; 625 626 if (addr4or5 && !addr6) { 627 meshhdr->flags |= MESH_FLAGS_AE_A4; 628 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 629 return 2 * ETH_ALEN; 630 } else if (addr4or5 && addr6) { 631 meshhdr->flags |= MESH_FLAGS_AE_A5_A6; 632 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 633 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); 634 return 3 * ETH_ALEN; 635 } 636 637 return ETH_ALEN; 638 } 639 640 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata) 641 { 642 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 643 u32 changed; 644 645 if (ifmsh->mshcfg.plink_timeout > 0) 646 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ); 647 mesh_path_expire(sdata); 648 649 changed = mesh_accept_plinks_update(sdata); 650 ieee80211_mbss_info_change_notify(sdata, changed); 651 652 mod_timer(&ifmsh->housekeeping_timer, 653 round_jiffies(jiffies + 654 IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); 655 } 656 657 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) 658 { 659 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 660 u32 interval; 661 662 mesh_path_tx_root_frame(sdata); 663 664 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN) 665 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; 666 else 667 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval; 668 669 mod_timer(&ifmsh->mesh_path_root_timer, 670 round_jiffies(TU_TO_EXP_TIME(interval))); 671 } 672 673 static int 674 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh) 675 { 676 struct beacon_data *bcn; 677 int head_len, tail_len; 678 struct sk_buff *skb; 679 struct ieee80211_mgmt *mgmt; 680 struct ieee80211_chanctx_conf *chanctx_conf; 681 struct mesh_csa_settings *csa; 682 enum nl80211_band band; 683 u8 *pos; 684 struct ieee80211_sub_if_data *sdata; 685 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon); 686 687 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh); 688 rcu_read_lock(); 689 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 690 band = chanctx_conf->def.chan->band; 691 rcu_read_unlock(); 692 693 head_len = hdr_len + 694 2 + /* NULL SSID */ 695 /* Channel Switch Announcement */ 696 2 + sizeof(struct ieee80211_channel_sw_ie) + 697 /* Mesh Channel Switch Parameters */ 698 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) + 699 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */ 700 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) + 701 2 + sizeof(struct ieee80211_sec_chan_offs_ie) + 702 2 + 8 + /* supported rates */ 703 2 + 3; /* DS params */ 704 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 705 2 + sizeof(struct ieee80211_ht_cap) + 706 2 + sizeof(struct ieee80211_ht_operation) + 707 2 + ifmsh->mesh_id_len + 708 2 + sizeof(struct ieee80211_meshconf_ie) + 709 2 + sizeof(__le16) + /* awake window */ 710 2 + sizeof(struct ieee80211_vht_cap) + 711 2 + sizeof(struct ieee80211_vht_operation) + 712 ifmsh->ie_len; 713 714 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL); 715 /* need an skb for IE builders to operate on */ 716 skb = dev_alloc_skb(max(head_len, tail_len)); 717 718 if (!bcn || !skb) 719 goto out_free; 720 721 /* 722 * pointers go into the block we allocated, 723 * memory is | beacon_data | head | tail | 724 */ 725 bcn->head = ((u8 *) bcn) + sizeof(*bcn); 726 727 /* fill in the head */ 728 mgmt = skb_put_zero(skb, hdr_len); 729 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 730 IEEE80211_STYPE_BEACON); 731 eth_broadcast_addr(mgmt->da); 732 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 733 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 734 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt); 735 mgmt->u.beacon.beacon_int = 736 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 737 mgmt->u.beacon.capab_info |= cpu_to_le16( 738 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 739 740 pos = skb_put(skb, 2); 741 *pos++ = WLAN_EID_SSID; 742 *pos++ = 0x0; 743 744 rcu_read_lock(); 745 csa = rcu_dereference(ifmsh->csa); 746 if (csa) { 747 enum nl80211_channel_type ct; 748 struct cfg80211_chan_def *chandef; 749 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) + 750 2 + sizeof(struct ieee80211_mesh_chansw_params_ie); 751 752 pos = skb_put_zero(skb, ie_len); 753 *pos++ = WLAN_EID_CHANNEL_SWITCH; 754 *pos++ = 3; 755 *pos++ = 0x0; 756 *pos++ = ieee80211_frequency_to_channel( 757 csa->settings.chandef.chan->center_freq); 758 bcn->csa_current_counter = csa->settings.count; 759 bcn->csa_counter_offsets[0] = hdr_len + 6; 760 *pos++ = csa->settings.count; 761 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; 762 *pos++ = 6; 763 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) { 764 *pos++ = ifmsh->mshcfg.dot11MeshTTL; 765 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 766 } else { 767 *pos++ = ifmsh->chsw_ttl; 768 } 769 *pos++ |= csa->settings.block_tx ? 770 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00; 771 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); 772 pos += 2; 773 put_unaligned_le16(ifmsh->pre_value, pos); 774 pos += 2; 775 776 switch (csa->settings.chandef.width) { 777 case NL80211_CHAN_WIDTH_40: 778 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie); 779 pos = skb_put_zero(skb, ie_len); 780 781 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */ 782 *pos++ = 1; /* len */ 783 ct = cfg80211_get_chandef_type(&csa->settings.chandef); 784 if (ct == NL80211_CHAN_HT40PLUS) 785 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE; 786 else 787 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW; 788 break; 789 case NL80211_CHAN_WIDTH_80: 790 case NL80211_CHAN_WIDTH_80P80: 791 case NL80211_CHAN_WIDTH_160: 792 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */ 793 ie_len = 2 + 2 + 794 sizeof(struct ieee80211_wide_bw_chansw_ie); 795 pos = skb_put_zero(skb, ie_len); 796 797 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */ 798 *pos++ = 5; /* len */ 799 /* put sub IE */ 800 chandef = &csa->settings.chandef; 801 ieee80211_ie_build_wide_bw_cs(pos, chandef); 802 break; 803 default: 804 break; 805 } 806 } 807 rcu_read_unlock(); 808 809 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 810 mesh_add_ds_params_ie(sdata, skb)) 811 goto out_free; 812 813 bcn->head_len = skb->len; 814 memcpy(bcn->head, skb->data, bcn->head_len); 815 816 /* now the tail */ 817 skb_trim(skb, 0); 818 bcn->tail = bcn->head + bcn->head_len; 819 820 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 821 mesh_add_rsn_ie(sdata, skb) || 822 mesh_add_ht_cap_ie(sdata, skb) || 823 mesh_add_ht_oper_ie(sdata, skb) || 824 mesh_add_meshid_ie(sdata, skb) || 825 mesh_add_meshconf_ie(sdata, skb) || 826 mesh_add_awake_window_ie(sdata, skb) || 827 mesh_add_vht_cap_ie(sdata, skb) || 828 mesh_add_vht_oper_ie(sdata, skb) || 829 mesh_add_vendor_ies(sdata, skb)) 830 goto out_free; 831 832 bcn->tail_len = skb->len; 833 memcpy(bcn->tail, skb->data, bcn->tail_len); 834 bcn->meshconf = (struct ieee80211_meshconf_ie *) 835 (bcn->tail + ifmsh->meshconf_offset); 836 837 dev_kfree_skb(skb); 838 rcu_assign_pointer(ifmsh->beacon, bcn); 839 return 0; 840 out_free: 841 kfree(bcn); 842 dev_kfree_skb(skb); 843 return -ENOMEM; 844 } 845 846 static int 847 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata) 848 { 849 struct beacon_data *old_bcn; 850 int ret; 851 852 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon, 853 lockdep_is_held(&sdata->wdev.mtx)); 854 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh); 855 if (ret) 856 /* just reuse old beacon */ 857 return ret; 858 859 if (old_bcn) 860 kfree_rcu(old_bcn, rcu_head); 861 return 0; 862 } 863 864 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 865 u32 changed) 866 { 867 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 868 unsigned long bits = changed; 869 u32 bit; 870 871 if (!bits) 872 return; 873 874 /* if we race with running work, worst case this work becomes a noop */ 875 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE) 876 set_bit(bit, &ifmsh->mbss_changed); 877 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags); 878 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 879 } 880 881 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 882 { 883 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 884 struct ieee80211_local *local = sdata->local; 885 u32 changed = BSS_CHANGED_BEACON | 886 BSS_CHANGED_BEACON_ENABLED | 887 BSS_CHANGED_HT | 888 BSS_CHANGED_BASIC_RATES | 889 BSS_CHANGED_BEACON_INT | 890 BSS_CHANGED_MCAST_RATE; 891 892 local->fif_other_bss++; 893 /* mesh ifaces must set allmulti to forward mcast traffic */ 894 atomic_inc(&local->iff_allmultis); 895 ieee80211_configure_filter(local); 896 897 ifmsh->mesh_cc_id = 0; /* Disabled */ 898 /* register sync ops from extensible synchronization framework */ 899 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id); 900 ifmsh->sync_offset_clockdrift_max = 0; 901 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 902 ieee80211_mesh_root_setup(ifmsh); 903 ieee80211_queue_work(&local->hw, &sdata->work); 904 sdata->vif.bss_conf.ht_operation_mode = 905 ifmsh->mshcfg.ht_opmode; 906 sdata->vif.bss_conf.enable_beacon = true; 907 908 changed |= ieee80211_mps_local_status_update(sdata); 909 910 if (ieee80211_mesh_build_beacon(ifmsh)) { 911 ieee80211_stop_mesh(sdata); 912 return -ENOMEM; 913 } 914 915 ieee80211_recalc_dtim(local, sdata); 916 ieee80211_bss_info_change_notify(sdata, changed); 917 918 netif_carrier_on(sdata->dev); 919 return 0; 920 } 921 922 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 923 { 924 struct ieee80211_local *local = sdata->local; 925 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 926 struct beacon_data *bcn; 927 928 netif_carrier_off(sdata->dev); 929 930 /* flush STAs and mpaths on this iface */ 931 sta_info_flush(sdata); 932 mesh_path_flush_by_iface(sdata); 933 934 /* stop the beacon */ 935 ifmsh->mesh_id_len = 0; 936 sdata->vif.bss_conf.enable_beacon = false; 937 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 938 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); 939 940 /* remove beacon */ 941 bcn = rcu_dereference_protected(ifmsh->beacon, 942 lockdep_is_held(&sdata->wdev.mtx)); 943 RCU_INIT_POINTER(ifmsh->beacon, NULL); 944 kfree_rcu(bcn, rcu_head); 945 946 /* free all potentially still buffered group-addressed frames */ 947 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf); 948 skb_queue_purge(&ifmsh->ps.bc_buf); 949 950 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 951 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 952 del_timer_sync(&sdata->u.mesh.mesh_path_timer); 953 954 /* clear any mesh work (for next join) we may have accrued */ 955 ifmsh->wrkq_flags = 0; 956 ifmsh->mbss_changed = 0; 957 958 local->fif_other_bss--; 959 atomic_dec(&local->iff_allmultis); 960 ieee80211_configure_filter(local); 961 } 962 963 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 964 { 965 int err; 966 967 /* if the current channel is a DFS channel, mark the channel as 968 * unavailable. 969 */ 970 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 971 &sdata->vif.bss_conf.chandef, 972 NL80211_IFTYPE_MESH_POINT); 973 if (err > 0) 974 cfg80211_radar_event(sdata->local->hw.wiphy, 975 &sdata->vif.bss_conf.chandef, GFP_ATOMIC); 976 } 977 978 static bool 979 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata, 980 struct ieee802_11_elems *elems, bool beacon) 981 { 982 struct cfg80211_csa_settings params; 983 struct ieee80211_csa_ie csa_ie; 984 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 985 struct ieee80211_supported_band *sband; 986 int err; 987 u32 sta_flags; 988 989 sdata_assert_lock(sdata); 990 991 sband = ieee80211_get_sband(sdata); 992 if (!sband) 993 return false; 994 995 sta_flags = 0; 996 switch (sdata->vif.bss_conf.chandef.width) { 997 case NL80211_CHAN_WIDTH_20_NOHT: 998 sta_flags |= IEEE80211_STA_DISABLE_HT; 999 /* fall through */ 1000 case NL80211_CHAN_WIDTH_20: 1001 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 1002 /* fall through */ 1003 case NL80211_CHAN_WIDTH_40: 1004 sta_flags |= IEEE80211_STA_DISABLE_VHT; 1005 break; 1006 default: 1007 break; 1008 } 1009 1010 memset(¶ms, 0, sizeof(params)); 1011 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band, 1012 sta_flags, sdata->vif.addr, 1013 &csa_ie); 1014 if (err < 0) 1015 return false; 1016 if (err) 1017 return false; 1018 1019 /* Mark the channel unavailable if the reason for the switch is 1020 * regulatory. 1021 */ 1022 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY) 1023 ieee80211_mesh_csa_mark_radar(sdata); 1024 1025 params.chandef = csa_ie.chandef; 1026 params.count = csa_ie.count; 1027 1028 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, 1029 IEEE80211_CHAN_DISABLED) || 1030 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 1031 NL80211_IFTYPE_MESH_POINT)) { 1032 sdata_info(sdata, 1033 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 1034 sdata->vif.addr, 1035 params.chandef.chan->center_freq, 1036 params.chandef.width, 1037 params.chandef.center_freq1, 1038 params.chandef.center_freq2); 1039 return false; 1040 } 1041 1042 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 1043 ¶ms.chandef, 1044 NL80211_IFTYPE_MESH_POINT); 1045 if (err < 0) 1046 return false; 1047 if (err > 0 && !ifmsh->userspace_handles_dfs) { 1048 sdata_info(sdata, 1049 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 1050 sdata->vif.addr, 1051 params.chandef.chan->center_freq, 1052 params.chandef.width, 1053 params.chandef.center_freq1, 1054 params.chandef.center_freq2); 1055 return false; 1056 } 1057 1058 params.radar_required = err; 1059 1060 if (cfg80211_chandef_identical(¶ms.chandef, 1061 &sdata->vif.bss_conf.chandef)) { 1062 mcsa_dbg(sdata, 1063 "received csa with an identical chandef, ignoring\n"); 1064 return true; 1065 } 1066 1067 mcsa_dbg(sdata, 1068 "received channel switch announcement to go to channel %d MHz\n", 1069 params.chandef.chan->center_freq); 1070 1071 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT; 1072 if (beacon) { 1073 ifmsh->chsw_ttl = csa_ie.ttl - 1; 1074 if (ifmsh->pre_value >= csa_ie.pre_value) 1075 return false; 1076 ifmsh->pre_value = csa_ie.pre_value; 1077 } 1078 1079 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) 1080 return false; 1081 1082 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; 1083 1084 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 1085 ¶ms) < 0) 1086 return false; 1087 1088 return true; 1089 } 1090 1091 static void 1092 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, 1093 struct ieee80211_mgmt *mgmt, size_t len) 1094 { 1095 struct ieee80211_local *local = sdata->local; 1096 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1097 struct sk_buff *presp; 1098 struct beacon_data *bcn; 1099 struct ieee80211_mgmt *hdr; 1100 struct ieee802_11_elems elems; 1101 size_t baselen; 1102 u8 *pos; 1103 1104 pos = mgmt->u.probe_req.variable; 1105 baselen = (u8 *) pos - (u8 *) mgmt; 1106 if (baselen > len) 1107 return; 1108 1109 ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid, 1110 NULL); 1111 1112 if (!elems.mesh_id) 1113 return; 1114 1115 /* 802.11-2012 10.1.4.3.2 */ 1116 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && 1117 !is_broadcast_ether_addr(mgmt->da)) || 1118 elems.ssid_len != 0) 1119 return; 1120 1121 if (elems.mesh_id_len != 0 && 1122 (elems.mesh_id_len != ifmsh->mesh_id_len || 1123 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) 1124 return; 1125 1126 rcu_read_lock(); 1127 bcn = rcu_dereference(ifmsh->beacon); 1128 1129 if (!bcn) 1130 goto out; 1131 1132 presp = dev_alloc_skb(local->tx_headroom + 1133 bcn->head_len + bcn->tail_len); 1134 if (!presp) 1135 goto out; 1136 1137 skb_reserve(presp, local->tx_headroom); 1138 skb_put_data(presp, bcn->head, bcn->head_len); 1139 skb_put_data(presp, bcn->tail, bcn->tail_len); 1140 hdr = (struct ieee80211_mgmt *) presp->data; 1141 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1142 IEEE80211_STYPE_PROBE_RESP); 1143 memcpy(hdr->da, mgmt->sa, ETH_ALEN); 1144 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1145 ieee80211_tx_skb(sdata, presp); 1146 out: 1147 rcu_read_unlock(); 1148 } 1149 1150 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 1151 u16 stype, 1152 struct ieee80211_mgmt *mgmt, 1153 size_t len, 1154 struct ieee80211_rx_status *rx_status) 1155 { 1156 struct ieee80211_local *local = sdata->local; 1157 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1158 struct ieee802_11_elems elems; 1159 struct ieee80211_channel *channel; 1160 size_t baselen; 1161 int freq; 1162 enum nl80211_band band = rx_status->band; 1163 1164 /* ignore ProbeResp to foreign address */ 1165 if (stype == IEEE80211_STYPE_PROBE_RESP && 1166 !ether_addr_equal(mgmt->da, sdata->vif.addr)) 1167 return; 1168 1169 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1170 if (baselen > len) 1171 return; 1172 1173 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1174 false, &elems, mgmt->bssid, NULL); 1175 1176 /* ignore non-mesh or secure / unsecure mismatch */ 1177 if ((!elems.mesh_id || !elems.mesh_config) || 1178 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) || 1179 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)) 1180 return; 1181 1182 if (elems.ds_params) 1183 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band); 1184 else 1185 freq = rx_status->freq; 1186 1187 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1188 1189 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1190 return; 1191 1192 if (mesh_matches_local(sdata, &elems)) { 1193 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n", 1194 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal); 1195 if (!sdata->u.mesh.user_mpm || 1196 sdata->u.mesh.mshcfg.rssi_threshold == 0 || 1197 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal) 1198 mesh_neighbour_update(sdata, mgmt->sa, &elems, 1199 rx_status); 1200 } 1201 1202 if (ifmsh->sync_ops) 1203 ifmsh->sync_ops->rx_bcn_presp(sdata, 1204 stype, mgmt, &elems, rx_status); 1205 1206 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && 1207 !sdata->vif.csa_active) 1208 ieee80211_mesh_process_chnswitch(sdata, &elems, true); 1209 } 1210 1211 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata) 1212 { 1213 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1214 struct mesh_csa_settings *tmp_csa_settings; 1215 int ret = 0; 1216 int changed = 0; 1217 1218 /* Reset the TTL value and Initiator flag */ 1219 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1220 ifmsh->chsw_ttl = 0; 1221 1222 /* Remove the CSA and MCSP elements from the beacon */ 1223 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1224 RCU_INIT_POINTER(ifmsh->csa, NULL); 1225 if (tmp_csa_settings) 1226 kfree_rcu(tmp_csa_settings, rcu_head); 1227 ret = ieee80211_mesh_rebuild_beacon(sdata); 1228 if (ret) 1229 return -EINVAL; 1230 1231 changed |= BSS_CHANGED_BEACON; 1232 1233 mcsa_dbg(sdata, "complete switching to center freq %d MHz", 1234 sdata->vif.bss_conf.chandef.chan->center_freq); 1235 return changed; 1236 } 1237 1238 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, 1239 struct cfg80211_csa_settings *csa_settings) 1240 { 1241 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1242 struct mesh_csa_settings *tmp_csa_settings; 1243 int ret = 0; 1244 1245 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings), 1246 GFP_ATOMIC); 1247 if (!tmp_csa_settings) 1248 return -ENOMEM; 1249 1250 memcpy(&tmp_csa_settings->settings, csa_settings, 1251 sizeof(struct cfg80211_csa_settings)); 1252 1253 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings); 1254 1255 ret = ieee80211_mesh_rebuild_beacon(sdata); 1256 if (ret) { 1257 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1258 RCU_INIT_POINTER(ifmsh->csa, NULL); 1259 kfree_rcu(tmp_csa_settings, rcu_head); 1260 return ret; 1261 } 1262 1263 return BSS_CHANGED_BEACON; 1264 } 1265 1266 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata, 1267 struct ieee80211_mgmt *mgmt, size_t len, 1268 struct ieee802_11_elems *elems) 1269 { 1270 struct ieee80211_mgmt *mgmt_fwd; 1271 struct sk_buff *skb; 1272 struct ieee80211_local *local = sdata->local; 1273 1274 skb = dev_alloc_skb(local->tx_headroom + len); 1275 if (!skb) 1276 return -ENOMEM; 1277 skb_reserve(skb, local->tx_headroom); 1278 mgmt_fwd = skb_put(skb, len); 1279 1280 elems->mesh_chansw_params_ie->mesh_ttl--; 1281 elems->mesh_chansw_params_ie->mesh_flags &= 1282 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 1283 1284 memcpy(mgmt_fwd, mgmt, len); 1285 eth_broadcast_addr(mgmt_fwd->da); 1286 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN); 1287 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN); 1288 1289 ieee80211_tx_skb(sdata, skb); 1290 return 0; 1291 } 1292 1293 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata, 1294 struct ieee80211_mgmt *mgmt, size_t len) 1295 { 1296 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1297 struct ieee802_11_elems elems; 1298 u16 pre_value; 1299 bool fwd_csa = true; 1300 size_t baselen; 1301 u8 *pos; 1302 1303 if (mgmt->u.action.u.measurement.action_code != 1304 WLAN_ACTION_SPCT_CHL_SWITCH) 1305 return; 1306 1307 pos = mgmt->u.action.u.chan_switch.variable; 1308 baselen = offsetof(struct ieee80211_mgmt, 1309 u.action.u.chan_switch.variable); 1310 ieee802_11_parse_elems(pos, len - baselen, true, &elems, 1311 mgmt->bssid, NULL); 1312 1313 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl; 1314 if (!--ifmsh->chsw_ttl) 1315 fwd_csa = false; 1316 1317 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value); 1318 if (ifmsh->pre_value >= pre_value) 1319 return; 1320 1321 ifmsh->pre_value = pre_value; 1322 1323 if (!sdata->vif.csa_active && 1324 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) { 1325 mcsa_dbg(sdata, "Failed to process CSA action frame"); 1326 return; 1327 } 1328 1329 /* forward or re-broadcast the CSA frame */ 1330 if (fwd_csa) { 1331 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0) 1332 mcsa_dbg(sdata, "Failed to forward the CSA frame"); 1333 } 1334 } 1335 1336 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 1337 struct ieee80211_mgmt *mgmt, 1338 size_t len, 1339 struct ieee80211_rx_status *rx_status) 1340 { 1341 switch (mgmt->u.action.category) { 1342 case WLAN_CATEGORY_SELF_PROTECTED: 1343 switch (mgmt->u.action.u.self_prot.action_code) { 1344 case WLAN_SP_MESH_PEERING_OPEN: 1345 case WLAN_SP_MESH_PEERING_CLOSE: 1346 case WLAN_SP_MESH_PEERING_CONFIRM: 1347 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 1348 break; 1349 } 1350 break; 1351 case WLAN_CATEGORY_MESH_ACTION: 1352 if (mesh_action_is_path_sel(mgmt)) 1353 mesh_rx_path_sel_frame(sdata, mgmt, len); 1354 break; 1355 case WLAN_CATEGORY_SPECTRUM_MGMT: 1356 mesh_rx_csa_frame(sdata, mgmt, len); 1357 break; 1358 } 1359 } 1360 1361 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1362 struct sk_buff *skb) 1363 { 1364 struct ieee80211_rx_status *rx_status; 1365 struct ieee80211_mgmt *mgmt; 1366 u16 stype; 1367 1368 sdata_lock(sdata); 1369 1370 /* mesh already went down */ 1371 if (!sdata->u.mesh.mesh_id_len) 1372 goto out; 1373 1374 rx_status = IEEE80211_SKB_RXCB(skb); 1375 mgmt = (struct ieee80211_mgmt *) skb->data; 1376 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 1377 1378 switch (stype) { 1379 case IEEE80211_STYPE_PROBE_RESP: 1380 case IEEE80211_STYPE_BEACON: 1381 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 1382 rx_status); 1383 break; 1384 case IEEE80211_STYPE_PROBE_REQ: 1385 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); 1386 break; 1387 case IEEE80211_STYPE_ACTION: 1388 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 1389 break; 1390 } 1391 out: 1392 sdata_unlock(sdata); 1393 } 1394 1395 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) 1396 { 1397 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1398 u32 bit, changed = 0; 1399 1400 for_each_set_bit(bit, &ifmsh->mbss_changed, 1401 sizeof(changed) * BITS_PER_BYTE) { 1402 clear_bit(bit, &ifmsh->mbss_changed); 1403 changed |= BIT(bit); 1404 } 1405 1406 if (sdata->vif.bss_conf.enable_beacon && 1407 (changed & (BSS_CHANGED_BEACON | 1408 BSS_CHANGED_HT | 1409 BSS_CHANGED_BASIC_RATES | 1410 BSS_CHANGED_BEACON_INT))) 1411 if (ieee80211_mesh_rebuild_beacon(sdata)) 1412 return; 1413 1414 ieee80211_bss_info_change_notify(sdata, changed); 1415 } 1416 1417 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 1418 { 1419 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1420 1421 sdata_lock(sdata); 1422 1423 /* mesh already went down */ 1424 if (!sdata->u.mesh.mesh_id_len) 1425 goto out; 1426 1427 if (ifmsh->preq_queue_len && 1428 time_after(jiffies, 1429 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 1430 mesh_path_start_discovery(sdata); 1431 1432 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 1433 ieee80211_mesh_housekeeping(sdata); 1434 1435 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 1436 ieee80211_mesh_rootpath(sdata); 1437 1438 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags)) 1439 mesh_sync_adjust_tsf(sdata); 1440 1441 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) 1442 mesh_bss_info_changed(sdata); 1443 out: 1444 sdata_unlock(sdata); 1445 } 1446 1447 1448 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 1449 { 1450 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1451 static u8 zero_addr[ETH_ALEN] = {}; 1452 1453 timer_setup(&ifmsh->housekeeping_timer, 1454 ieee80211_mesh_housekeeping_timer, 0); 1455 1456 ifmsh->accepting_plinks = true; 1457 atomic_set(&ifmsh->mpaths, 0); 1458 mesh_rmc_init(sdata); 1459 ifmsh->last_preq = jiffies; 1460 ifmsh->next_perr = jiffies; 1461 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1462 /* Allocate all mesh structures when creating the first mesh interface. */ 1463 if (!mesh_allocated) 1464 ieee80211s_init(); 1465 1466 mesh_pathtbl_init(sdata); 1467 1468 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0); 1469 timer_setup(&ifmsh->mesh_path_root_timer, 1470 ieee80211_mesh_path_root_timer, 0); 1471 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 1472 skb_queue_head_init(&ifmsh->ps.bc_buf); 1473 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 1474 spin_lock_init(&ifmsh->sync_offset_lock); 1475 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1476 1477 sdata->vif.bss_conf.bssid = zero_addr; 1478 } 1479 1480 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1481 { 1482 mesh_rmc_free(sdata); 1483 mesh_pathtbl_unregister(sdata); 1484 } 1485