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