1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2008, 2009 open80211s Ltd. 4 * Copyright (C) 2018 - 2019 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 67 /* 68 * As support for each feature is added, check for matching 69 * - On mesh config capabilities 70 * - Power Save Support En 71 * - Sync support enabled 72 * - Sync support active 73 * - Sync support required from peer 74 * - MDA enabled 75 * - Power management control on fc 76 */ 77 if (!(ifmsh->mesh_id_len == ie->mesh_id_len && 78 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 && 79 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) && 80 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) && 81 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) && 82 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) && 83 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))) 84 return false; 85 86 sband = ieee80211_get_sband(sdata); 87 if (!sband) 88 return false; 89 90 ieee80211_sta_get_rates(sdata, ie, sband->band, 91 &basic_rates); 92 93 if (sdata->vif.bss_conf.basic_rates != basic_rates) 94 return false; 95 96 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan, 97 NL80211_CHAN_NO_HT); 98 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def); 99 ieee80211_chandef_vht_oper(&sdata->local->hw, 100 ie->vht_operation, ie->ht_operation, 101 &sta_chan_def); 102 103 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef, 104 &sta_chan_def)) 105 return false; 106 107 return true; 108 } 109 110 /** 111 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links 112 * 113 * @ie: information elements of a management frame from the mesh peer 114 */ 115 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) 116 { 117 return (ie->mesh_config->meshconf_cap & 118 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0; 119 } 120 121 /** 122 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons 123 * 124 * @sdata: mesh interface in which mesh beacons are going to be updated 125 * 126 * Returns: beacon changed flag if the beacon content changed. 127 */ 128 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) 129 { 130 bool free_plinks; 131 u32 changed = 0; 132 133 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, 134 * the mesh interface might be able to establish plinks with peers that 135 * are already on the table but are not on PLINK_ESTAB state. However, 136 * in general the mesh interface is not accepting peer link requests 137 * from new peers, and that must be reflected in the beacon 138 */ 139 free_plinks = mesh_plink_availables(sdata); 140 141 if (free_plinks != sdata->u.mesh.accepting_plinks) { 142 sdata->u.mesh.accepting_plinks = free_plinks; 143 changed = BSS_CHANGED_BEACON; 144 } 145 146 return changed; 147 } 148 149 /* 150 * mesh_sta_cleanup - clean up any mesh sta state 151 * 152 * @sta: mesh sta to clean up. 153 */ 154 void mesh_sta_cleanup(struct sta_info *sta) 155 { 156 struct ieee80211_sub_if_data *sdata = sta->sdata; 157 u32 changed = mesh_plink_deactivate(sta); 158 159 if (changed) 160 ieee80211_mbss_info_change_notify(sdata, changed); 161 } 162 163 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) 164 { 165 int i; 166 167 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); 168 if (!sdata->u.mesh.rmc) 169 return -ENOMEM; 170 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; 171 for (i = 0; i < RMC_BUCKETS; i++) 172 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]); 173 return 0; 174 } 175 176 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) 177 { 178 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 179 struct rmc_entry *p; 180 struct hlist_node *n; 181 int i; 182 183 if (!sdata->u.mesh.rmc) 184 return; 185 186 for (i = 0; i < RMC_BUCKETS; i++) { 187 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) { 188 hlist_del(&p->list); 189 kmem_cache_free(rm_cache, p); 190 } 191 } 192 193 kfree(rmc); 194 sdata->u.mesh.rmc = NULL; 195 } 196 197 /** 198 * mesh_rmc_check - Check frame in recent multicast cache and add if absent. 199 * 200 * @sdata: interface 201 * @sa: source address 202 * @mesh_hdr: mesh_header 203 * 204 * Returns: 0 if the frame is not in the cache, nonzero otherwise. 205 * 206 * Checks using the source address and the mesh sequence number if we have 207 * received this frame lately. If the frame is not in the cache, it is added to 208 * it. 209 */ 210 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 211 const u8 *sa, struct ieee80211s_hdr *mesh_hdr) 212 { 213 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 214 u32 seqnum = 0; 215 int entries = 0; 216 u8 idx; 217 struct rmc_entry *p; 218 struct hlist_node *n; 219 220 if (!rmc) 221 return -1; 222 223 /* Don't care about endianness since only match matters */ 224 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); 225 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; 226 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) { 227 ++entries; 228 if (time_after(jiffies, p->exp_time) || 229 entries == RMC_QUEUE_MAX_LEN) { 230 hlist_del(&p->list); 231 kmem_cache_free(rm_cache, p); 232 --entries; 233 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa)) 234 return -1; 235 } 236 237 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); 238 if (!p) 239 return 0; 240 241 p->seqnum = seqnum; 242 p->exp_time = jiffies + RMC_TIMEOUT; 243 memcpy(p->sa, sa, ETH_ALEN); 244 hlist_add_head(&p->list, &rmc->bucket[idx]); 245 return 0; 246 } 247 248 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 249 struct sk_buff *skb) 250 { 251 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 252 u8 *pos, neighbors; 253 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie); 254 bool is_connected_to_gate = ifmsh->num_gates > 0 || 255 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol || 256 ifmsh->mshcfg.dot11MeshConnectedToMeshGate; 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) | is_connected_to_gate; 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 ieee80211_free_keys(sdata, true); 930 mesh_path_flush_by_iface(sdata); 931 932 /* stop the beacon */ 933 ifmsh->mesh_id_len = 0; 934 sdata->vif.bss_conf.enable_beacon = false; 935 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 936 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); 937 938 /* remove beacon */ 939 bcn = rcu_dereference_protected(ifmsh->beacon, 940 lockdep_is_held(&sdata->wdev.mtx)); 941 RCU_INIT_POINTER(ifmsh->beacon, NULL); 942 kfree_rcu(bcn, rcu_head); 943 944 /* free all potentially still buffered group-addressed frames */ 945 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf); 946 skb_queue_purge(&ifmsh->ps.bc_buf); 947 948 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 949 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 950 del_timer_sync(&sdata->u.mesh.mesh_path_timer); 951 952 /* clear any mesh work (for next join) we may have accrued */ 953 ifmsh->wrkq_flags = 0; 954 ifmsh->mbss_changed = 0; 955 956 local->fif_other_bss--; 957 atomic_dec(&local->iff_allmultis); 958 ieee80211_configure_filter(local); 959 } 960 961 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 962 { 963 int err; 964 965 /* if the current channel is a DFS channel, mark the channel as 966 * unavailable. 967 */ 968 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 969 &sdata->vif.bss_conf.chandef, 970 NL80211_IFTYPE_MESH_POINT); 971 if (err > 0) 972 cfg80211_radar_event(sdata->local->hw.wiphy, 973 &sdata->vif.bss_conf.chandef, GFP_ATOMIC); 974 } 975 976 static bool 977 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata, 978 struct ieee802_11_elems *elems, bool beacon) 979 { 980 struct cfg80211_csa_settings params; 981 struct ieee80211_csa_ie csa_ie; 982 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 983 struct ieee80211_supported_band *sband; 984 int err; 985 u32 sta_flags; 986 987 sdata_assert_lock(sdata); 988 989 sband = ieee80211_get_sband(sdata); 990 if (!sband) 991 return false; 992 993 sta_flags = 0; 994 switch (sdata->vif.bss_conf.chandef.width) { 995 case NL80211_CHAN_WIDTH_20_NOHT: 996 sta_flags |= IEEE80211_STA_DISABLE_HT; 997 /* fall through */ 998 case NL80211_CHAN_WIDTH_20: 999 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 1000 /* fall through */ 1001 case NL80211_CHAN_WIDTH_40: 1002 sta_flags |= IEEE80211_STA_DISABLE_VHT; 1003 break; 1004 default: 1005 break; 1006 } 1007 1008 memset(¶ms, 0, sizeof(params)); 1009 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band, 1010 sta_flags, sdata->vif.addr, 1011 &csa_ie); 1012 if (err < 0) 1013 return false; 1014 if (err) 1015 return false; 1016 1017 /* Mark the channel unavailable if the reason for the switch is 1018 * regulatory. 1019 */ 1020 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY) 1021 ieee80211_mesh_csa_mark_radar(sdata); 1022 1023 params.chandef = csa_ie.chandef; 1024 params.count = csa_ie.count; 1025 1026 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, 1027 IEEE80211_CHAN_DISABLED) || 1028 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 1029 NL80211_IFTYPE_MESH_POINT)) { 1030 sdata_info(sdata, 1031 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 1032 sdata->vif.addr, 1033 params.chandef.chan->center_freq, 1034 params.chandef.width, 1035 params.chandef.center_freq1, 1036 params.chandef.center_freq2); 1037 return false; 1038 } 1039 1040 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 1041 ¶ms.chandef, 1042 NL80211_IFTYPE_MESH_POINT); 1043 if (err < 0) 1044 return false; 1045 if (err > 0 && !ifmsh->userspace_handles_dfs) { 1046 sdata_info(sdata, 1047 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 1048 sdata->vif.addr, 1049 params.chandef.chan->center_freq, 1050 params.chandef.width, 1051 params.chandef.center_freq1, 1052 params.chandef.center_freq2); 1053 return false; 1054 } 1055 1056 params.radar_required = err; 1057 1058 if (cfg80211_chandef_identical(¶ms.chandef, 1059 &sdata->vif.bss_conf.chandef)) { 1060 mcsa_dbg(sdata, 1061 "received csa with an identical chandef, ignoring\n"); 1062 return true; 1063 } 1064 1065 mcsa_dbg(sdata, 1066 "received channel switch announcement to go to channel %d MHz\n", 1067 params.chandef.chan->center_freq); 1068 1069 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT; 1070 if (beacon) { 1071 ifmsh->chsw_ttl = csa_ie.ttl - 1; 1072 if (ifmsh->pre_value >= csa_ie.pre_value) 1073 return false; 1074 ifmsh->pre_value = csa_ie.pre_value; 1075 } 1076 1077 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) 1078 return false; 1079 1080 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; 1081 1082 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 1083 ¶ms) < 0) 1084 return false; 1085 1086 return true; 1087 } 1088 1089 static void 1090 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, 1091 struct ieee80211_mgmt *mgmt, size_t len) 1092 { 1093 struct ieee80211_local *local = sdata->local; 1094 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1095 struct sk_buff *presp; 1096 struct beacon_data *bcn; 1097 struct ieee80211_mgmt *hdr; 1098 struct ieee802_11_elems elems; 1099 size_t baselen; 1100 u8 *pos; 1101 1102 pos = mgmt->u.probe_req.variable; 1103 baselen = (u8 *) pos - (u8 *) mgmt; 1104 if (baselen > len) 1105 return; 1106 1107 ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid, 1108 NULL); 1109 1110 if (!elems.mesh_id) 1111 return; 1112 1113 /* 802.11-2012 10.1.4.3.2 */ 1114 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && 1115 !is_broadcast_ether_addr(mgmt->da)) || 1116 elems.ssid_len != 0) 1117 return; 1118 1119 if (elems.mesh_id_len != 0 && 1120 (elems.mesh_id_len != ifmsh->mesh_id_len || 1121 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) 1122 return; 1123 1124 rcu_read_lock(); 1125 bcn = rcu_dereference(ifmsh->beacon); 1126 1127 if (!bcn) 1128 goto out; 1129 1130 presp = dev_alloc_skb(local->tx_headroom + 1131 bcn->head_len + bcn->tail_len); 1132 if (!presp) 1133 goto out; 1134 1135 skb_reserve(presp, local->tx_headroom); 1136 skb_put_data(presp, bcn->head, bcn->head_len); 1137 skb_put_data(presp, bcn->tail, bcn->tail_len); 1138 hdr = (struct ieee80211_mgmt *) presp->data; 1139 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1140 IEEE80211_STYPE_PROBE_RESP); 1141 memcpy(hdr->da, mgmt->sa, ETH_ALEN); 1142 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1143 ieee80211_tx_skb(sdata, presp); 1144 out: 1145 rcu_read_unlock(); 1146 } 1147 1148 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 1149 u16 stype, 1150 struct ieee80211_mgmt *mgmt, 1151 size_t len, 1152 struct ieee80211_rx_status *rx_status) 1153 { 1154 struct ieee80211_local *local = sdata->local; 1155 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1156 struct ieee802_11_elems elems; 1157 struct ieee80211_channel *channel; 1158 size_t baselen; 1159 int freq; 1160 enum nl80211_band band = rx_status->band; 1161 1162 /* ignore ProbeResp to foreign address */ 1163 if (stype == IEEE80211_STYPE_PROBE_RESP && 1164 !ether_addr_equal(mgmt->da, sdata->vif.addr)) 1165 return; 1166 1167 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1168 if (baselen > len) 1169 return; 1170 1171 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1172 false, &elems, mgmt->bssid, NULL); 1173 1174 /* ignore non-mesh or secure / unsecure mismatch */ 1175 if ((!elems.mesh_id || !elems.mesh_config) || 1176 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) || 1177 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)) 1178 return; 1179 1180 if (elems.ds_params) 1181 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band); 1182 else 1183 freq = rx_status->freq; 1184 1185 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1186 1187 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1188 return; 1189 1190 if (mesh_matches_local(sdata, &elems)) { 1191 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n", 1192 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal); 1193 if (!sdata->u.mesh.user_mpm || 1194 sdata->u.mesh.mshcfg.rssi_threshold == 0 || 1195 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal) 1196 mesh_neighbour_update(sdata, mgmt->sa, &elems, 1197 rx_status); 1198 } 1199 1200 if (ifmsh->sync_ops) 1201 ifmsh->sync_ops->rx_bcn_presp(sdata, 1202 stype, mgmt, &elems, rx_status); 1203 1204 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && 1205 !sdata->vif.csa_active) 1206 ieee80211_mesh_process_chnswitch(sdata, &elems, true); 1207 } 1208 1209 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata) 1210 { 1211 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1212 struct mesh_csa_settings *tmp_csa_settings; 1213 int ret = 0; 1214 int changed = 0; 1215 1216 /* Reset the TTL value and Initiator flag */ 1217 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1218 ifmsh->chsw_ttl = 0; 1219 1220 /* Remove the CSA and MCSP elements from the beacon */ 1221 tmp_csa_settings = rcu_dereference_protected(ifmsh->csa, 1222 lockdep_is_held(&sdata->wdev.mtx)); 1223 RCU_INIT_POINTER(ifmsh->csa, NULL); 1224 if (tmp_csa_settings) 1225 kfree_rcu(tmp_csa_settings, rcu_head); 1226 ret = ieee80211_mesh_rebuild_beacon(sdata); 1227 if (ret) 1228 return -EINVAL; 1229 1230 changed |= BSS_CHANGED_BEACON; 1231 1232 mcsa_dbg(sdata, "complete switching to center freq %d MHz", 1233 sdata->vif.bss_conf.chandef.chan->center_freq); 1234 return changed; 1235 } 1236 1237 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, 1238 struct cfg80211_csa_settings *csa_settings) 1239 { 1240 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1241 struct mesh_csa_settings *tmp_csa_settings; 1242 int ret = 0; 1243 1244 lockdep_assert_held(&sdata->wdev.mtx); 1245 1246 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings), 1247 GFP_ATOMIC); 1248 if (!tmp_csa_settings) 1249 return -ENOMEM; 1250 1251 memcpy(&tmp_csa_settings->settings, csa_settings, 1252 sizeof(struct cfg80211_csa_settings)); 1253 1254 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings); 1255 1256 ret = ieee80211_mesh_rebuild_beacon(sdata); 1257 if (ret) { 1258 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1259 RCU_INIT_POINTER(ifmsh->csa, NULL); 1260 kfree_rcu(tmp_csa_settings, rcu_head); 1261 return ret; 1262 } 1263 1264 return BSS_CHANGED_BEACON; 1265 } 1266 1267 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata, 1268 struct ieee80211_mgmt *mgmt, size_t len, 1269 struct ieee802_11_elems *elems) 1270 { 1271 struct ieee80211_mgmt *mgmt_fwd; 1272 struct sk_buff *skb; 1273 struct ieee80211_local *local = sdata->local; 1274 1275 skb = dev_alloc_skb(local->tx_headroom + len); 1276 if (!skb) 1277 return -ENOMEM; 1278 skb_reserve(skb, local->tx_headroom); 1279 mgmt_fwd = skb_put(skb, len); 1280 1281 elems->mesh_chansw_params_ie->mesh_ttl--; 1282 elems->mesh_chansw_params_ie->mesh_flags &= 1283 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 1284 1285 memcpy(mgmt_fwd, mgmt, len); 1286 eth_broadcast_addr(mgmt_fwd->da); 1287 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN); 1288 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN); 1289 1290 ieee80211_tx_skb(sdata, skb); 1291 return 0; 1292 } 1293 1294 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata, 1295 struct ieee80211_mgmt *mgmt, size_t len) 1296 { 1297 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1298 struct ieee802_11_elems elems; 1299 u16 pre_value; 1300 bool fwd_csa = true; 1301 size_t baselen; 1302 u8 *pos; 1303 1304 if (mgmt->u.action.u.measurement.action_code != 1305 WLAN_ACTION_SPCT_CHL_SWITCH) 1306 return; 1307 1308 pos = mgmt->u.action.u.chan_switch.variable; 1309 baselen = offsetof(struct ieee80211_mgmt, 1310 u.action.u.chan_switch.variable); 1311 ieee802_11_parse_elems(pos, len - baselen, true, &elems, 1312 mgmt->bssid, NULL); 1313 1314 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl; 1315 if (!--ifmsh->chsw_ttl) 1316 fwd_csa = false; 1317 1318 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value); 1319 if (ifmsh->pre_value >= pre_value) 1320 return; 1321 1322 ifmsh->pre_value = pre_value; 1323 1324 if (!sdata->vif.csa_active && 1325 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) { 1326 mcsa_dbg(sdata, "Failed to process CSA action frame"); 1327 return; 1328 } 1329 1330 /* forward or re-broadcast the CSA frame */ 1331 if (fwd_csa) { 1332 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0) 1333 mcsa_dbg(sdata, "Failed to forward the CSA frame"); 1334 } 1335 } 1336 1337 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 1338 struct ieee80211_mgmt *mgmt, 1339 size_t len, 1340 struct ieee80211_rx_status *rx_status) 1341 { 1342 switch (mgmt->u.action.category) { 1343 case WLAN_CATEGORY_SELF_PROTECTED: 1344 switch (mgmt->u.action.u.self_prot.action_code) { 1345 case WLAN_SP_MESH_PEERING_OPEN: 1346 case WLAN_SP_MESH_PEERING_CLOSE: 1347 case WLAN_SP_MESH_PEERING_CONFIRM: 1348 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 1349 break; 1350 } 1351 break; 1352 case WLAN_CATEGORY_MESH_ACTION: 1353 if (mesh_action_is_path_sel(mgmt)) 1354 mesh_rx_path_sel_frame(sdata, mgmt, len); 1355 break; 1356 case WLAN_CATEGORY_SPECTRUM_MGMT: 1357 mesh_rx_csa_frame(sdata, mgmt, len); 1358 break; 1359 } 1360 } 1361 1362 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1363 struct sk_buff *skb) 1364 { 1365 struct ieee80211_rx_status *rx_status; 1366 struct ieee80211_mgmt *mgmt; 1367 u16 stype; 1368 1369 sdata_lock(sdata); 1370 1371 /* mesh already went down */ 1372 if (!sdata->u.mesh.mesh_id_len) 1373 goto out; 1374 1375 rx_status = IEEE80211_SKB_RXCB(skb); 1376 mgmt = (struct ieee80211_mgmt *) skb->data; 1377 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 1378 1379 switch (stype) { 1380 case IEEE80211_STYPE_PROBE_RESP: 1381 case IEEE80211_STYPE_BEACON: 1382 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 1383 rx_status); 1384 break; 1385 case IEEE80211_STYPE_PROBE_REQ: 1386 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); 1387 break; 1388 case IEEE80211_STYPE_ACTION: 1389 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 1390 break; 1391 } 1392 out: 1393 sdata_unlock(sdata); 1394 } 1395 1396 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) 1397 { 1398 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1399 u32 bit, changed = 0; 1400 1401 for_each_set_bit(bit, &ifmsh->mbss_changed, 1402 sizeof(changed) * BITS_PER_BYTE) { 1403 clear_bit(bit, &ifmsh->mbss_changed); 1404 changed |= BIT(bit); 1405 } 1406 1407 if (sdata->vif.bss_conf.enable_beacon && 1408 (changed & (BSS_CHANGED_BEACON | 1409 BSS_CHANGED_HT | 1410 BSS_CHANGED_BASIC_RATES | 1411 BSS_CHANGED_BEACON_INT))) 1412 if (ieee80211_mesh_rebuild_beacon(sdata)) 1413 return; 1414 1415 ieee80211_bss_info_change_notify(sdata, changed); 1416 } 1417 1418 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 1419 { 1420 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1421 1422 sdata_lock(sdata); 1423 1424 /* mesh already went down */ 1425 if (!sdata->u.mesh.mesh_id_len) 1426 goto out; 1427 1428 if (ifmsh->preq_queue_len && 1429 time_after(jiffies, 1430 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 1431 mesh_path_start_discovery(sdata); 1432 1433 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 1434 ieee80211_mesh_housekeeping(sdata); 1435 1436 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 1437 ieee80211_mesh_rootpath(sdata); 1438 1439 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags)) 1440 mesh_sync_adjust_tsf(sdata); 1441 1442 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) 1443 mesh_bss_info_changed(sdata); 1444 out: 1445 sdata_unlock(sdata); 1446 } 1447 1448 1449 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 1450 { 1451 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1452 static u8 zero_addr[ETH_ALEN] = {}; 1453 1454 timer_setup(&ifmsh->housekeeping_timer, 1455 ieee80211_mesh_housekeeping_timer, 0); 1456 1457 ifmsh->accepting_plinks = true; 1458 atomic_set(&ifmsh->mpaths, 0); 1459 mesh_rmc_init(sdata); 1460 ifmsh->last_preq = jiffies; 1461 ifmsh->next_perr = jiffies; 1462 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1463 /* Allocate all mesh structures when creating the first mesh interface. */ 1464 if (!mesh_allocated) 1465 ieee80211s_init(); 1466 1467 mesh_pathtbl_init(sdata); 1468 1469 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0); 1470 timer_setup(&ifmsh->mesh_path_root_timer, 1471 ieee80211_mesh_path_root_timer, 0); 1472 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 1473 skb_queue_head_init(&ifmsh->ps.bc_buf); 1474 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 1475 spin_lock_init(&ifmsh->sync_offset_lock); 1476 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1477 1478 sdata->vif.bss_conf.bssid = zero_addr; 1479 } 1480 1481 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1482 { 1483 mesh_rmc_free(sdata); 1484 mesh_pathtbl_unregister(sdata); 1485 } 1486