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