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 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 ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata), 87 &basic_rates); 88 89 if (sdata->vif.bss_conf.basic_rates != basic_rates) 90 return false; 91 92 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan, 93 NL80211_CHAN_NO_HT); 94 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def); 95 ieee80211_chandef_vht_oper(ie->vht_operation, &sta_chan_def); 96 97 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef, 98 &sta_chan_def)) 99 return false; 100 101 return true; 102 } 103 104 /** 105 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links 106 * 107 * @ie: information elements of a management frame from the mesh peer 108 */ 109 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) 110 { 111 return (ie->mesh_config->meshconf_cap & 112 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0; 113 } 114 115 /** 116 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons 117 * 118 * @sdata: mesh interface in which mesh beacons are going to be updated 119 * 120 * Returns: beacon changed flag if the beacon content changed. 121 */ 122 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) 123 { 124 bool free_plinks; 125 u32 changed = 0; 126 127 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, 128 * the mesh interface might be able to establish plinks with peers that 129 * are already on the table but are not on PLINK_ESTAB state. However, 130 * in general the mesh interface is not accepting peer link requests 131 * from new peers, and that must be reflected in the beacon 132 */ 133 free_plinks = mesh_plink_availables(sdata); 134 135 if (free_plinks != sdata->u.mesh.accepting_plinks) { 136 sdata->u.mesh.accepting_plinks = free_plinks; 137 changed = BSS_CHANGED_BEACON; 138 } 139 140 return changed; 141 } 142 143 /* 144 * mesh_sta_cleanup - clean up any mesh sta state 145 * 146 * @sta: mesh sta to clean up. 147 */ 148 void mesh_sta_cleanup(struct sta_info *sta) 149 { 150 struct ieee80211_sub_if_data *sdata = sta->sdata; 151 u32 changed; 152 153 /* 154 * maybe userspace handles peer allocation and peering, but in either 155 * case the beacon is still generated by the kernel and we might need 156 * an update. 157 */ 158 changed = mesh_accept_plinks_update(sdata); 159 if (!sdata->u.mesh.user_mpm) { 160 changed |= mesh_plink_deactivate(sta); 161 del_timer_sync(&sta->mesh->plink_timer); 162 } 163 164 if (changed) 165 ieee80211_mbss_info_change_notify(sdata, changed); 166 } 167 168 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) 169 { 170 int i; 171 172 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); 173 if (!sdata->u.mesh.rmc) 174 return -ENOMEM; 175 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; 176 for (i = 0; i < RMC_BUCKETS; i++) 177 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]); 178 return 0; 179 } 180 181 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) 182 { 183 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 184 struct rmc_entry *p; 185 struct hlist_node *n; 186 int i; 187 188 if (!sdata->u.mesh.rmc) 189 return; 190 191 for (i = 0; i < RMC_BUCKETS; i++) { 192 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) { 193 hlist_del(&p->list); 194 kmem_cache_free(rm_cache, p); 195 } 196 } 197 198 kfree(rmc); 199 sdata->u.mesh.rmc = NULL; 200 } 201 202 /** 203 * mesh_rmc_check - Check frame in recent multicast cache and add if absent. 204 * 205 * @sdata: interface 206 * @sa: source address 207 * @mesh_hdr: mesh_header 208 * 209 * Returns: 0 if the frame is not in the cache, nonzero otherwise. 210 * 211 * Checks using the source address and the mesh sequence number if we have 212 * received this frame lately. If the frame is not in the cache, it is added to 213 * it. 214 */ 215 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 216 const u8 *sa, struct ieee80211s_hdr *mesh_hdr) 217 { 218 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 219 u32 seqnum = 0; 220 int entries = 0; 221 u8 idx; 222 struct rmc_entry *p; 223 struct hlist_node *n; 224 225 if (!rmc) 226 return -1; 227 228 /* Don't care about endianness since only match matters */ 229 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); 230 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; 231 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) { 232 ++entries; 233 if (time_after(jiffies, p->exp_time) || 234 entries == RMC_QUEUE_MAX_LEN) { 235 hlist_del(&p->list); 236 kmem_cache_free(rm_cache, p); 237 --entries; 238 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa)) 239 return -1; 240 } 241 242 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); 243 if (!p) 244 return 0; 245 246 p->seqnum = seqnum; 247 p->exp_time = jiffies + RMC_TIMEOUT; 248 memcpy(p->sa, sa, ETH_ALEN); 249 hlist_add_head(&p->list, &rmc->bucket[idx]); 250 return 0; 251 } 252 253 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 254 struct sk_buff *skb) 255 { 256 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 257 u8 *pos, neighbors; 258 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie); 259 260 if (skb_tailroom(skb) < 2 + meshconf_len) 261 return -ENOMEM; 262 263 pos = skb_put(skb, 2 + meshconf_len); 264 *pos++ = WLAN_EID_MESH_CONFIG; 265 *pos++ = meshconf_len; 266 267 /* save a pointer for quick updates in pre-tbtt */ 268 ifmsh->meshconf_offset = pos - skb->data; 269 270 /* Active path selection protocol ID */ 271 *pos++ = ifmsh->mesh_pp_id; 272 /* Active path selection metric ID */ 273 *pos++ = ifmsh->mesh_pm_id; 274 /* Congestion control mode identifier */ 275 *pos++ = ifmsh->mesh_cc_id; 276 /* Synchronization protocol identifier */ 277 *pos++ = ifmsh->mesh_sp_id; 278 /* Authentication Protocol identifier */ 279 *pos++ = ifmsh->mesh_auth_id; 280 /* Mesh Formation Info - number of neighbors */ 281 neighbors = atomic_read(&ifmsh->estab_plinks); 282 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS); 283 *pos++ = neighbors << 1; 284 /* Mesh capability */ 285 *pos = 0x00; 286 *pos |= ifmsh->mshcfg.dot11MeshForwarding ? 287 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00; 288 *pos |= ifmsh->accepting_plinks ? 289 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; 290 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */ 291 *pos |= ifmsh->ps_peers_deep_sleep ? 292 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00; 293 *pos++ |= ifmsh->adjusting_tbtt ? 294 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00; 295 *pos++ = 0x00; 296 297 return 0; 298 } 299 300 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 301 { 302 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 303 u8 *pos; 304 305 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len) 306 return -ENOMEM; 307 308 pos = skb_put(skb, 2 + ifmsh->mesh_id_len); 309 *pos++ = WLAN_EID_MESH_ID; 310 *pos++ = ifmsh->mesh_id_len; 311 if (ifmsh->mesh_id_len) 312 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len); 313 314 return 0; 315 } 316 317 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata, 318 struct sk_buff *skb) 319 { 320 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 321 u8 *pos; 322 323 /* see IEEE802.11-2012 13.14.6 */ 324 if (ifmsh->ps_peers_light_sleep == 0 && 325 ifmsh->ps_peers_deep_sleep == 0 && 326 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE) 327 return 0; 328 329 if (skb_tailroom(skb) < 4) 330 return -ENOMEM; 331 332 pos = skb_put(skb, 2 + 2); 333 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW; 334 *pos++ = 2; 335 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos); 336 337 return 0; 338 } 339 340 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 341 struct sk_buff *skb) 342 { 343 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 344 u8 offset, len; 345 const u8 *data; 346 347 if (!ifmsh->ie || !ifmsh->ie_len) 348 return 0; 349 350 /* fast-forward to vendor IEs */ 351 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0); 352 353 if (offset) { 354 len = ifmsh->ie_len - offset; 355 data = ifmsh->ie + offset; 356 if (skb_tailroom(skb) < len) 357 return -ENOMEM; 358 memcpy(skb_put(skb, len), data, len); 359 } 360 361 return 0; 362 } 363 364 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 365 { 366 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 367 u8 len = 0; 368 const u8 *data; 369 370 if (!ifmsh->ie || !ifmsh->ie_len) 371 return 0; 372 373 /* find RSN IE */ 374 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len); 375 if (!data) 376 return 0; 377 378 len = data[1] + 2; 379 380 if (skb_tailroom(skb) < len) 381 return -ENOMEM; 382 memcpy(skb_put(skb, len), data, len); 383 384 return 0; 385 } 386 387 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata, 388 struct sk_buff *skb) 389 { 390 struct ieee80211_chanctx_conf *chanctx_conf; 391 struct ieee80211_channel *chan; 392 u8 *pos; 393 394 if (skb_tailroom(skb) < 3) 395 return -ENOMEM; 396 397 rcu_read_lock(); 398 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 399 if (WARN_ON(!chanctx_conf)) { 400 rcu_read_unlock(); 401 return -EINVAL; 402 } 403 chan = chanctx_conf->def.chan; 404 rcu_read_unlock(); 405 406 pos = skb_put(skb, 2 + 1); 407 *pos++ = WLAN_EID_DS_PARAMS; 408 *pos++ = 1; 409 *pos++ = ieee80211_frequency_to_channel(chan->center_freq); 410 411 return 0; 412 } 413 414 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 415 struct sk_buff *skb) 416 { 417 struct ieee80211_local *local = sdata->local; 418 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 419 struct ieee80211_supported_band *sband; 420 u8 *pos; 421 422 sband = local->hw.wiphy->bands[band]; 423 if (!sband->ht_cap.ht_supported || 424 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 425 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 426 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 427 return 0; 428 429 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap)) 430 return -ENOMEM; 431 432 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap)); 433 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap); 434 435 return 0; 436 } 437 438 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 439 struct sk_buff *skb) 440 { 441 struct ieee80211_local *local = sdata->local; 442 struct ieee80211_chanctx_conf *chanctx_conf; 443 struct ieee80211_channel *channel; 444 struct ieee80211_supported_band *sband; 445 struct ieee80211_sta_ht_cap *ht_cap; 446 u8 *pos; 447 448 rcu_read_lock(); 449 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 450 if (WARN_ON(!chanctx_conf)) { 451 rcu_read_unlock(); 452 return -EINVAL; 453 } 454 channel = chanctx_conf->def.chan; 455 rcu_read_unlock(); 456 457 sband = local->hw.wiphy->bands[channel->band]; 458 ht_cap = &sband->ht_cap; 459 460 if (!ht_cap->ht_supported || 461 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 462 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 463 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 464 return 0; 465 466 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation)) 467 return -ENOMEM; 468 469 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 470 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef, 471 sdata->vif.bss_conf.ht_operation_mode, 472 false); 473 474 return 0; 475 } 476 477 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, 478 struct sk_buff *skb) 479 { 480 struct ieee80211_local *local = sdata->local; 481 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 482 struct ieee80211_supported_band *sband; 483 u8 *pos; 484 485 sband = local->hw.wiphy->bands[band]; 486 if (!sband->vht_cap.vht_supported || 487 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 488 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 489 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 490 return 0; 491 492 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap)) 493 return -ENOMEM; 494 495 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap)); 496 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap); 497 498 return 0; 499 } 500 501 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, 502 struct sk_buff *skb) 503 { 504 struct ieee80211_local *local = sdata->local; 505 struct ieee80211_chanctx_conf *chanctx_conf; 506 struct ieee80211_channel *channel; 507 struct ieee80211_supported_band *sband; 508 struct ieee80211_sta_vht_cap *vht_cap; 509 u8 *pos; 510 511 rcu_read_lock(); 512 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 513 if (WARN_ON(!chanctx_conf)) { 514 rcu_read_unlock(); 515 return -EINVAL; 516 } 517 channel = chanctx_conf->def.chan; 518 rcu_read_unlock(); 519 520 sband = local->hw.wiphy->bands[channel->band]; 521 vht_cap = &sband->vht_cap; 522 523 if (!vht_cap->vht_supported || 524 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 525 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 526 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 527 return 0; 528 529 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation)) 530 return -ENOMEM; 531 532 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 533 ieee80211_ie_build_vht_oper(pos, vht_cap, 534 &sdata->vif.bss_conf.chandef); 535 536 return 0; 537 } 538 539 static void ieee80211_mesh_path_timer(unsigned long data) 540 { 541 struct ieee80211_sub_if_data *sdata = 542 (struct ieee80211_sub_if_data *) data; 543 544 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 545 } 546 547 static void ieee80211_mesh_path_root_timer(unsigned long data) 548 { 549 struct ieee80211_sub_if_data *sdata = 550 (struct ieee80211_sub_if_data *) data; 551 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 552 553 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 554 555 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 556 } 557 558 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh) 559 { 560 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT) 561 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 562 else { 563 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 564 /* stop running timer */ 565 del_timer_sync(&ifmsh->mesh_path_root_timer); 566 } 567 } 568 569 /** 570 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame 571 * @hdr: 802.11 frame header 572 * @fc: frame control field 573 * @meshda: destination address in the mesh 574 * @meshsa: source address address in the mesh. Same as TA, as frame is 575 * locally originated. 576 * 577 * Return the length of the 802.11 (does not include a mesh control header) 578 */ 579 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 580 const u8 *meshda, const u8 *meshsa) 581 { 582 if (is_multicast_ether_addr(meshda)) { 583 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 584 /* DA TA SA */ 585 memcpy(hdr->addr1, meshda, ETH_ALEN); 586 memcpy(hdr->addr2, meshsa, ETH_ALEN); 587 memcpy(hdr->addr3, meshsa, ETH_ALEN); 588 return 24; 589 } else { 590 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 591 /* RA TA DA SA */ 592 eth_zero_addr(hdr->addr1); /* RA is resolved later */ 593 memcpy(hdr->addr2, meshsa, ETH_ALEN); 594 memcpy(hdr->addr3, meshda, ETH_ALEN); 595 memcpy(hdr->addr4, meshsa, ETH_ALEN); 596 return 30; 597 } 598 } 599 600 /** 601 * ieee80211_new_mesh_header - create a new mesh header 602 * @sdata: mesh interface to be used 603 * @meshhdr: uninitialized mesh header 604 * @addr4or5: 1st address in the ae header, which may correspond to address 4 605 * (if addr6 is NULL) or address 5 (if addr6 is present). It may 606 * be NULL. 607 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the 608 * mesh frame 609 * 610 * Return the header length. 611 */ 612 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 613 struct ieee80211s_hdr *meshhdr, 614 const char *addr4or5, const char *addr6) 615 { 616 if (WARN_ON(!addr4or5 && addr6)) 617 return 0; 618 619 memset(meshhdr, 0, sizeof(*meshhdr)); 620 621 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; 622 623 /* FIXME: racy -- TX on multiple queues can be concurrent */ 624 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); 625 sdata->u.mesh.mesh_seqnum++; 626 627 if (addr4or5 && !addr6) { 628 meshhdr->flags |= MESH_FLAGS_AE_A4; 629 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 630 return 2 * ETH_ALEN; 631 } else if (addr4or5 && addr6) { 632 meshhdr->flags |= MESH_FLAGS_AE_A5_A6; 633 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 634 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); 635 return 3 * ETH_ALEN; 636 } 637 638 return ETH_ALEN; 639 } 640 641 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata) 642 { 643 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 644 u32 changed; 645 646 if (ifmsh->mshcfg.plink_timeout > 0) 647 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ); 648 mesh_path_expire(sdata); 649 650 changed = mesh_accept_plinks_update(sdata); 651 ieee80211_mbss_info_change_notify(sdata, changed); 652 653 mod_timer(&ifmsh->housekeeping_timer, 654 round_jiffies(jiffies + 655 IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); 656 } 657 658 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) 659 { 660 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 661 u32 interval; 662 663 mesh_path_tx_root_frame(sdata); 664 665 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN) 666 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; 667 else 668 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval; 669 670 mod_timer(&ifmsh->mesh_path_root_timer, 671 round_jiffies(TU_TO_EXP_TIME(interval))); 672 } 673 674 static int 675 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh) 676 { 677 struct beacon_data *bcn; 678 int head_len, tail_len; 679 struct sk_buff *skb; 680 struct ieee80211_mgmt *mgmt; 681 struct ieee80211_chanctx_conf *chanctx_conf; 682 struct mesh_csa_settings *csa; 683 enum nl80211_band band; 684 u8 *pos; 685 struct ieee80211_sub_if_data *sdata; 686 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 687 sizeof(mgmt->u.beacon); 688 689 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh); 690 rcu_read_lock(); 691 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 692 band = chanctx_conf->def.chan->band; 693 rcu_read_unlock(); 694 695 head_len = hdr_len + 696 2 + /* NULL SSID */ 697 /* Channel Switch Announcement */ 698 2 + sizeof(struct ieee80211_channel_sw_ie) + 699 /* Mesh Channel Swith Parameters */ 700 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) + 701 2 + 8 + /* supported rates */ 702 2 + 3; /* DS params */ 703 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 704 2 + sizeof(struct ieee80211_ht_cap) + 705 2 + sizeof(struct ieee80211_ht_operation) + 706 2 + ifmsh->mesh_id_len + 707 2 + sizeof(struct ieee80211_meshconf_ie) + 708 2 + sizeof(__le16) + /* awake window */ 709 2 + sizeof(struct ieee80211_vht_cap) + 710 2 + sizeof(struct ieee80211_vht_operation) + 711 ifmsh->ie_len; 712 713 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL); 714 /* need an skb for IE builders to operate on */ 715 skb = dev_alloc_skb(max(head_len, tail_len)); 716 717 if (!bcn || !skb) 718 goto out_free; 719 720 /* 721 * pointers go into the block we allocated, 722 * memory is | beacon_data | head | tail | 723 */ 724 bcn->head = ((u8 *) bcn) + sizeof(*bcn); 725 726 /* fill in the head */ 727 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 728 memset(mgmt, 0, hdr_len); 729 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 730 IEEE80211_STYPE_BEACON); 731 eth_broadcast_addr(mgmt->da); 732 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 733 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 734 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt); 735 mgmt->u.beacon.beacon_int = 736 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 737 mgmt->u.beacon.capab_info |= cpu_to_le16( 738 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 739 740 pos = skb_put(skb, 2); 741 *pos++ = WLAN_EID_SSID; 742 *pos++ = 0x0; 743 744 rcu_read_lock(); 745 csa = rcu_dereference(ifmsh->csa); 746 if (csa) { 747 pos = skb_put(skb, 13); 748 memset(pos, 0, 13); 749 *pos++ = WLAN_EID_CHANNEL_SWITCH; 750 *pos++ = 3; 751 *pos++ = 0x0; 752 *pos++ = ieee80211_frequency_to_channel( 753 csa->settings.chandef.chan->center_freq); 754 bcn->csa_current_counter = csa->settings.count; 755 bcn->csa_counter_offsets[0] = hdr_len + 6; 756 *pos++ = csa->settings.count; 757 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; 758 *pos++ = 6; 759 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) { 760 *pos++ = ifmsh->mshcfg.dot11MeshTTL; 761 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 762 } else { 763 *pos++ = ifmsh->chsw_ttl; 764 } 765 *pos++ |= csa->settings.block_tx ? 766 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00; 767 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); 768 pos += 2; 769 put_unaligned_le16(ifmsh->pre_value, pos); 770 pos += 2; 771 } 772 rcu_read_unlock(); 773 774 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 775 mesh_add_ds_params_ie(sdata, skb)) 776 goto out_free; 777 778 bcn->head_len = skb->len; 779 memcpy(bcn->head, skb->data, bcn->head_len); 780 781 /* now the tail */ 782 skb_trim(skb, 0); 783 bcn->tail = bcn->head + bcn->head_len; 784 785 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 786 mesh_add_rsn_ie(sdata, skb) || 787 mesh_add_ht_cap_ie(sdata, skb) || 788 mesh_add_ht_oper_ie(sdata, skb) || 789 mesh_add_meshid_ie(sdata, skb) || 790 mesh_add_meshconf_ie(sdata, skb) || 791 mesh_add_awake_window_ie(sdata, skb) || 792 mesh_add_vht_cap_ie(sdata, skb) || 793 mesh_add_vht_oper_ie(sdata, skb) || 794 mesh_add_vendor_ies(sdata, skb)) 795 goto out_free; 796 797 bcn->tail_len = skb->len; 798 memcpy(bcn->tail, skb->data, bcn->tail_len); 799 bcn->meshconf = (struct ieee80211_meshconf_ie *) 800 (bcn->tail + ifmsh->meshconf_offset); 801 802 dev_kfree_skb(skb); 803 rcu_assign_pointer(ifmsh->beacon, bcn); 804 return 0; 805 out_free: 806 kfree(bcn); 807 dev_kfree_skb(skb); 808 return -ENOMEM; 809 } 810 811 static int 812 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata) 813 { 814 struct beacon_data *old_bcn; 815 int ret; 816 817 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon, 818 lockdep_is_held(&sdata->wdev.mtx)); 819 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh); 820 if (ret) 821 /* just reuse old beacon */ 822 return ret; 823 824 if (old_bcn) 825 kfree_rcu(old_bcn, rcu_head); 826 return 0; 827 } 828 829 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 830 u32 changed) 831 { 832 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 833 unsigned long bits = changed; 834 u32 bit; 835 836 if (!bits) 837 return; 838 839 /* if we race with running work, worst case this work becomes a noop */ 840 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE) 841 set_bit(bit, &ifmsh->mbss_changed); 842 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags); 843 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 844 } 845 846 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 847 { 848 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 849 struct ieee80211_local *local = sdata->local; 850 u32 changed = BSS_CHANGED_BEACON | 851 BSS_CHANGED_BEACON_ENABLED | 852 BSS_CHANGED_HT | 853 BSS_CHANGED_BASIC_RATES | 854 BSS_CHANGED_BEACON_INT; 855 856 local->fif_other_bss++; 857 /* mesh ifaces must set allmulti to forward mcast traffic */ 858 atomic_inc(&local->iff_allmultis); 859 ieee80211_configure_filter(local); 860 861 ifmsh->mesh_cc_id = 0; /* Disabled */ 862 /* register sync ops from extensible synchronization framework */ 863 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id); 864 ifmsh->adjusting_tbtt = false; 865 ifmsh->sync_offset_clockdrift_max = 0; 866 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 867 ieee80211_mesh_root_setup(ifmsh); 868 ieee80211_queue_work(&local->hw, &sdata->work); 869 sdata->vif.bss_conf.ht_operation_mode = 870 ifmsh->mshcfg.ht_opmode; 871 sdata->vif.bss_conf.enable_beacon = true; 872 873 changed |= ieee80211_mps_local_status_update(sdata); 874 875 if (ieee80211_mesh_build_beacon(ifmsh)) { 876 ieee80211_stop_mesh(sdata); 877 return -ENOMEM; 878 } 879 880 ieee80211_recalc_dtim(local, sdata); 881 ieee80211_bss_info_change_notify(sdata, changed); 882 883 netif_carrier_on(sdata->dev); 884 return 0; 885 } 886 887 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 888 { 889 struct ieee80211_local *local = sdata->local; 890 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 891 struct beacon_data *bcn; 892 893 netif_carrier_off(sdata->dev); 894 895 /* stop the beacon */ 896 ifmsh->mesh_id_len = 0; 897 sdata->vif.bss_conf.enable_beacon = false; 898 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 899 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); 900 bcn = rcu_dereference_protected(ifmsh->beacon, 901 lockdep_is_held(&sdata->wdev.mtx)); 902 RCU_INIT_POINTER(ifmsh->beacon, NULL); 903 kfree_rcu(bcn, rcu_head); 904 905 /* flush STAs and mpaths on this iface */ 906 sta_info_flush(sdata); 907 mesh_path_flush_by_iface(sdata); 908 909 /* free all potentially still buffered group-addressed frames */ 910 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf); 911 skb_queue_purge(&ifmsh->ps.bc_buf); 912 913 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 914 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 915 del_timer_sync(&sdata->u.mesh.mesh_path_timer); 916 917 /* clear any mesh work (for next join) we may have accrued */ 918 ifmsh->wrkq_flags = 0; 919 ifmsh->mbss_changed = 0; 920 921 local->fif_other_bss--; 922 atomic_dec(&local->iff_allmultis); 923 ieee80211_configure_filter(local); 924 } 925 926 static bool 927 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata, 928 struct ieee802_11_elems *elems, bool beacon) 929 { 930 struct cfg80211_csa_settings params; 931 struct ieee80211_csa_ie csa_ie; 932 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 933 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 934 int err; 935 u32 sta_flags; 936 937 sdata_assert_lock(sdata); 938 939 sta_flags = IEEE80211_STA_DISABLE_VHT; 940 switch (sdata->vif.bss_conf.chandef.width) { 941 case NL80211_CHAN_WIDTH_20_NOHT: 942 sta_flags |= IEEE80211_STA_DISABLE_HT; 943 case NL80211_CHAN_WIDTH_20: 944 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 945 break; 946 default: 947 break; 948 } 949 950 memset(¶ms, 0, sizeof(params)); 951 memset(&csa_ie, 0, sizeof(csa_ie)); 952 err = ieee80211_parse_ch_switch_ie(sdata, elems, band, 953 sta_flags, sdata->vif.addr, 954 &csa_ie); 955 if (err < 0) 956 return false; 957 if (err) 958 return false; 959 960 params.chandef = csa_ie.chandef; 961 params.count = csa_ie.count; 962 963 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, 964 IEEE80211_CHAN_DISABLED)) { 965 sdata_info(sdata, 966 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 967 sdata->vif.addr, 968 params.chandef.chan->center_freq, 969 params.chandef.width, 970 params.chandef.center_freq1, 971 params.chandef.center_freq2); 972 return false; 973 } 974 975 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 976 ¶ms.chandef, 977 NL80211_IFTYPE_MESH_POINT); 978 if (err < 0) 979 return false; 980 if (err > 0) 981 /* TODO: DFS not (yet) supported */ 982 return false; 983 984 params.radar_required = err; 985 986 if (cfg80211_chandef_identical(¶ms.chandef, 987 &sdata->vif.bss_conf.chandef)) { 988 mcsa_dbg(sdata, 989 "received csa with an identical chandef, ignoring\n"); 990 return true; 991 } 992 993 mcsa_dbg(sdata, 994 "received channel switch announcement to go to channel %d MHz\n", 995 params.chandef.chan->center_freq); 996 997 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT; 998 if (beacon) { 999 ifmsh->chsw_ttl = csa_ie.ttl - 1; 1000 if (ifmsh->pre_value >= csa_ie.pre_value) 1001 return false; 1002 ifmsh->pre_value = csa_ie.pre_value; 1003 } 1004 1005 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) 1006 return false; 1007 1008 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; 1009 1010 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 1011 ¶ms) < 0) 1012 return false; 1013 1014 return true; 1015 } 1016 1017 static void 1018 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, 1019 struct ieee80211_mgmt *mgmt, size_t len) 1020 { 1021 struct ieee80211_local *local = sdata->local; 1022 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1023 struct sk_buff *presp; 1024 struct beacon_data *bcn; 1025 struct ieee80211_mgmt *hdr; 1026 struct ieee802_11_elems elems; 1027 size_t baselen; 1028 u8 *pos; 1029 1030 pos = mgmt->u.probe_req.variable; 1031 baselen = (u8 *) pos - (u8 *) mgmt; 1032 if (baselen > len) 1033 return; 1034 1035 ieee802_11_parse_elems(pos, len - baselen, false, &elems); 1036 1037 if (!elems.mesh_id) 1038 return; 1039 1040 /* 802.11-2012 10.1.4.3.2 */ 1041 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && 1042 !is_broadcast_ether_addr(mgmt->da)) || 1043 elems.ssid_len != 0) 1044 return; 1045 1046 if (elems.mesh_id_len != 0 && 1047 (elems.mesh_id_len != ifmsh->mesh_id_len || 1048 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) 1049 return; 1050 1051 rcu_read_lock(); 1052 bcn = rcu_dereference(ifmsh->beacon); 1053 1054 if (!bcn) 1055 goto out; 1056 1057 presp = dev_alloc_skb(local->tx_headroom + 1058 bcn->head_len + bcn->tail_len); 1059 if (!presp) 1060 goto out; 1061 1062 skb_reserve(presp, local->tx_headroom); 1063 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len); 1064 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len); 1065 hdr = (struct ieee80211_mgmt *) presp->data; 1066 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1067 IEEE80211_STYPE_PROBE_RESP); 1068 memcpy(hdr->da, mgmt->sa, ETH_ALEN); 1069 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1070 ieee80211_tx_skb(sdata, presp); 1071 out: 1072 rcu_read_unlock(); 1073 } 1074 1075 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 1076 u16 stype, 1077 struct ieee80211_mgmt *mgmt, 1078 size_t len, 1079 struct ieee80211_rx_status *rx_status) 1080 { 1081 struct ieee80211_local *local = sdata->local; 1082 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1083 struct ieee802_11_elems elems; 1084 struct ieee80211_channel *channel; 1085 size_t baselen; 1086 int freq; 1087 enum nl80211_band band = rx_status->band; 1088 1089 /* ignore ProbeResp to foreign address */ 1090 if (stype == IEEE80211_STYPE_PROBE_RESP && 1091 !ether_addr_equal(mgmt->da, sdata->vif.addr)) 1092 return; 1093 1094 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1095 if (baselen > len) 1096 return; 1097 1098 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1099 false, &elems); 1100 1101 /* ignore non-mesh or secure / unsecure mismatch */ 1102 if ((!elems.mesh_id || !elems.mesh_config) || 1103 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) || 1104 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)) 1105 return; 1106 1107 if (elems.ds_params) 1108 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band); 1109 else 1110 freq = rx_status->freq; 1111 1112 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1113 1114 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1115 return; 1116 1117 if (mesh_matches_local(sdata, &elems)) 1118 mesh_neighbour_update(sdata, mgmt->sa, &elems); 1119 1120 if (ifmsh->sync_ops) 1121 ifmsh->sync_ops->rx_bcn_presp(sdata, 1122 stype, mgmt, &elems, rx_status); 1123 1124 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && 1125 !sdata->vif.csa_active) 1126 ieee80211_mesh_process_chnswitch(sdata, &elems, true); 1127 } 1128 1129 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata) 1130 { 1131 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1132 struct mesh_csa_settings *tmp_csa_settings; 1133 int ret = 0; 1134 int changed = 0; 1135 1136 /* Reset the TTL value and Initiator flag */ 1137 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1138 ifmsh->chsw_ttl = 0; 1139 1140 /* Remove the CSA and MCSP elements from the beacon */ 1141 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1142 RCU_INIT_POINTER(ifmsh->csa, NULL); 1143 if (tmp_csa_settings) 1144 kfree_rcu(tmp_csa_settings, rcu_head); 1145 ret = ieee80211_mesh_rebuild_beacon(sdata); 1146 if (ret) 1147 return -EINVAL; 1148 1149 changed |= BSS_CHANGED_BEACON; 1150 1151 mcsa_dbg(sdata, "complete switching to center freq %d MHz", 1152 sdata->vif.bss_conf.chandef.chan->center_freq); 1153 return changed; 1154 } 1155 1156 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, 1157 struct cfg80211_csa_settings *csa_settings) 1158 { 1159 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1160 struct mesh_csa_settings *tmp_csa_settings; 1161 int ret = 0; 1162 1163 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings), 1164 GFP_ATOMIC); 1165 if (!tmp_csa_settings) 1166 return -ENOMEM; 1167 1168 memcpy(&tmp_csa_settings->settings, csa_settings, 1169 sizeof(struct cfg80211_csa_settings)); 1170 1171 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings); 1172 1173 ret = ieee80211_mesh_rebuild_beacon(sdata); 1174 if (ret) { 1175 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1176 RCU_INIT_POINTER(ifmsh->csa, NULL); 1177 kfree_rcu(tmp_csa_settings, rcu_head); 1178 return ret; 1179 } 1180 1181 return BSS_CHANGED_BEACON; 1182 } 1183 1184 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata, 1185 struct ieee80211_mgmt *mgmt, size_t len) 1186 { 1187 struct ieee80211_mgmt *mgmt_fwd; 1188 struct sk_buff *skb; 1189 struct ieee80211_local *local = sdata->local; 1190 u8 *pos = mgmt->u.action.u.chan_switch.variable; 1191 size_t offset_ttl; 1192 1193 skb = dev_alloc_skb(local->tx_headroom + len); 1194 if (!skb) 1195 return -ENOMEM; 1196 skb_reserve(skb, local->tx_headroom); 1197 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len); 1198 1199 /* offset_ttl is based on whether the secondary channel 1200 * offset is available or not. Subtract 1 from the mesh TTL 1201 * and disable the initiator flag before forwarding. 1202 */ 1203 offset_ttl = (len < 42) ? 7 : 10; 1204 *(pos + offset_ttl) -= 1; 1205 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 1206 1207 memcpy(mgmt_fwd, mgmt, len); 1208 eth_broadcast_addr(mgmt_fwd->da); 1209 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN); 1210 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN); 1211 1212 ieee80211_tx_skb(sdata, skb); 1213 return 0; 1214 } 1215 1216 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata, 1217 struct ieee80211_mgmt *mgmt, size_t len) 1218 { 1219 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1220 struct ieee802_11_elems elems; 1221 u16 pre_value; 1222 bool fwd_csa = true; 1223 size_t baselen; 1224 u8 *pos; 1225 1226 if (mgmt->u.action.u.measurement.action_code != 1227 WLAN_ACTION_SPCT_CHL_SWITCH) 1228 return; 1229 1230 pos = mgmt->u.action.u.chan_switch.variable; 1231 baselen = offsetof(struct ieee80211_mgmt, 1232 u.action.u.chan_switch.variable); 1233 ieee802_11_parse_elems(pos, len - baselen, false, &elems); 1234 1235 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl; 1236 if (!--ifmsh->chsw_ttl) 1237 fwd_csa = false; 1238 1239 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value); 1240 if (ifmsh->pre_value >= pre_value) 1241 return; 1242 1243 ifmsh->pre_value = pre_value; 1244 1245 if (!sdata->vif.csa_active && 1246 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) { 1247 mcsa_dbg(sdata, "Failed to process CSA action frame"); 1248 return; 1249 } 1250 1251 /* forward or re-broadcast the CSA frame */ 1252 if (fwd_csa) { 1253 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0) 1254 mcsa_dbg(sdata, "Failed to forward the CSA frame"); 1255 } 1256 } 1257 1258 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 1259 struct ieee80211_mgmt *mgmt, 1260 size_t len, 1261 struct ieee80211_rx_status *rx_status) 1262 { 1263 switch (mgmt->u.action.category) { 1264 case WLAN_CATEGORY_SELF_PROTECTED: 1265 switch (mgmt->u.action.u.self_prot.action_code) { 1266 case WLAN_SP_MESH_PEERING_OPEN: 1267 case WLAN_SP_MESH_PEERING_CLOSE: 1268 case WLAN_SP_MESH_PEERING_CONFIRM: 1269 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 1270 break; 1271 } 1272 break; 1273 case WLAN_CATEGORY_MESH_ACTION: 1274 if (mesh_action_is_path_sel(mgmt)) 1275 mesh_rx_path_sel_frame(sdata, mgmt, len); 1276 break; 1277 case WLAN_CATEGORY_SPECTRUM_MGMT: 1278 mesh_rx_csa_frame(sdata, mgmt, len); 1279 break; 1280 } 1281 } 1282 1283 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1284 struct sk_buff *skb) 1285 { 1286 struct ieee80211_rx_status *rx_status; 1287 struct ieee80211_mgmt *mgmt; 1288 u16 stype; 1289 1290 sdata_lock(sdata); 1291 1292 /* mesh already went down */ 1293 if (!sdata->u.mesh.mesh_id_len) 1294 goto out; 1295 1296 rx_status = IEEE80211_SKB_RXCB(skb); 1297 mgmt = (struct ieee80211_mgmt *) skb->data; 1298 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 1299 1300 switch (stype) { 1301 case IEEE80211_STYPE_PROBE_RESP: 1302 case IEEE80211_STYPE_BEACON: 1303 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 1304 rx_status); 1305 break; 1306 case IEEE80211_STYPE_PROBE_REQ: 1307 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); 1308 break; 1309 case IEEE80211_STYPE_ACTION: 1310 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 1311 break; 1312 } 1313 out: 1314 sdata_unlock(sdata); 1315 } 1316 1317 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) 1318 { 1319 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1320 u32 bit, changed = 0; 1321 1322 for_each_set_bit(bit, &ifmsh->mbss_changed, 1323 sizeof(changed) * BITS_PER_BYTE) { 1324 clear_bit(bit, &ifmsh->mbss_changed); 1325 changed |= BIT(bit); 1326 } 1327 1328 if (sdata->vif.bss_conf.enable_beacon && 1329 (changed & (BSS_CHANGED_BEACON | 1330 BSS_CHANGED_HT | 1331 BSS_CHANGED_BASIC_RATES | 1332 BSS_CHANGED_BEACON_INT))) 1333 if (ieee80211_mesh_rebuild_beacon(sdata)) 1334 return; 1335 1336 ieee80211_bss_info_change_notify(sdata, changed); 1337 } 1338 1339 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 1340 { 1341 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1342 1343 sdata_lock(sdata); 1344 1345 /* mesh already went down */ 1346 if (!sdata->u.mesh.mesh_id_len) 1347 goto out; 1348 1349 if (ifmsh->preq_queue_len && 1350 time_after(jiffies, 1351 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 1352 mesh_path_start_discovery(sdata); 1353 1354 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 1355 ieee80211_mesh_housekeeping(sdata); 1356 1357 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 1358 ieee80211_mesh_rootpath(sdata); 1359 1360 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags)) 1361 mesh_sync_adjust_tbtt(sdata); 1362 1363 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) 1364 mesh_bss_info_changed(sdata); 1365 out: 1366 sdata_unlock(sdata); 1367 } 1368 1369 1370 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 1371 { 1372 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1373 static u8 zero_addr[ETH_ALEN] = {}; 1374 1375 setup_timer(&ifmsh->housekeeping_timer, 1376 ieee80211_mesh_housekeeping_timer, 1377 (unsigned long) sdata); 1378 1379 ifmsh->accepting_plinks = true; 1380 atomic_set(&ifmsh->mpaths, 0); 1381 mesh_rmc_init(sdata); 1382 ifmsh->last_preq = jiffies; 1383 ifmsh->next_perr = jiffies; 1384 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1385 /* Allocate all mesh structures when creating the first mesh interface. */ 1386 if (!mesh_allocated) 1387 ieee80211s_init(); 1388 1389 mesh_pathtbl_init(sdata); 1390 1391 setup_timer(&ifmsh->mesh_path_timer, 1392 ieee80211_mesh_path_timer, 1393 (unsigned long) sdata); 1394 setup_timer(&ifmsh->mesh_path_root_timer, 1395 ieee80211_mesh_path_root_timer, 1396 (unsigned long) sdata); 1397 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 1398 skb_queue_head_init(&ifmsh->ps.bc_buf); 1399 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 1400 spin_lock_init(&ifmsh->sync_offset_lock); 1401 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1402 1403 sdata->vif.bss_conf.bssid = zero_addr; 1404 } 1405 1406 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1407 { 1408 mesh_rmc_free(sdata); 1409 mesh_pathtbl_unregister(sdata); 1410 } 1411