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