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 memcpy(skb_put(skb, len), 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 memcpy(skb_put(skb, len), 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 = offsetof(struct ieee80211_mgmt, u.beacon) + 679 sizeof(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 2 + 8 + /* supported rates */ 694 2 + 3; /* DS params */ 695 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 696 2 + sizeof(struct ieee80211_ht_cap) + 697 2 + sizeof(struct ieee80211_ht_operation) + 698 2 + ifmsh->mesh_id_len + 699 2 + sizeof(struct ieee80211_meshconf_ie) + 700 2 + sizeof(__le16) + /* awake window */ 701 2 + sizeof(struct ieee80211_vht_cap) + 702 2 + sizeof(struct ieee80211_vht_operation) + 703 ifmsh->ie_len; 704 705 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL); 706 /* need an skb for IE builders to operate on */ 707 skb = dev_alloc_skb(max(head_len, tail_len)); 708 709 if (!bcn || !skb) 710 goto out_free; 711 712 /* 713 * pointers go into the block we allocated, 714 * memory is | beacon_data | head | tail | 715 */ 716 bcn->head = ((u8 *) bcn) + sizeof(*bcn); 717 718 /* fill in the head */ 719 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 720 memset(mgmt, 0, hdr_len); 721 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 722 IEEE80211_STYPE_BEACON); 723 eth_broadcast_addr(mgmt->da); 724 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 725 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 726 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt); 727 mgmt->u.beacon.beacon_int = 728 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 729 mgmt->u.beacon.capab_info |= cpu_to_le16( 730 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 731 732 pos = skb_put(skb, 2); 733 *pos++ = WLAN_EID_SSID; 734 *pos++ = 0x0; 735 736 rcu_read_lock(); 737 csa = rcu_dereference(ifmsh->csa); 738 if (csa) { 739 pos = skb_put(skb, 13); 740 memset(pos, 0, 13); 741 *pos++ = WLAN_EID_CHANNEL_SWITCH; 742 *pos++ = 3; 743 *pos++ = 0x0; 744 *pos++ = ieee80211_frequency_to_channel( 745 csa->settings.chandef.chan->center_freq); 746 bcn->csa_current_counter = csa->settings.count; 747 bcn->csa_counter_offsets[0] = hdr_len + 6; 748 *pos++ = csa->settings.count; 749 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; 750 *pos++ = 6; 751 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) { 752 *pos++ = ifmsh->mshcfg.dot11MeshTTL; 753 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 754 } else { 755 *pos++ = ifmsh->chsw_ttl; 756 } 757 *pos++ |= csa->settings.block_tx ? 758 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00; 759 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); 760 pos += 2; 761 put_unaligned_le16(ifmsh->pre_value, pos); 762 pos += 2; 763 } 764 rcu_read_unlock(); 765 766 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 767 mesh_add_ds_params_ie(sdata, skb)) 768 goto out_free; 769 770 bcn->head_len = skb->len; 771 memcpy(bcn->head, skb->data, bcn->head_len); 772 773 /* now the tail */ 774 skb_trim(skb, 0); 775 bcn->tail = bcn->head + bcn->head_len; 776 777 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 778 mesh_add_rsn_ie(sdata, skb) || 779 mesh_add_ht_cap_ie(sdata, skb) || 780 mesh_add_ht_oper_ie(sdata, skb) || 781 mesh_add_meshid_ie(sdata, skb) || 782 mesh_add_meshconf_ie(sdata, skb) || 783 mesh_add_awake_window_ie(sdata, skb) || 784 mesh_add_vht_cap_ie(sdata, skb) || 785 mesh_add_vht_oper_ie(sdata, skb) || 786 mesh_add_vendor_ies(sdata, skb)) 787 goto out_free; 788 789 bcn->tail_len = skb->len; 790 memcpy(bcn->tail, skb->data, bcn->tail_len); 791 bcn->meshconf = (struct ieee80211_meshconf_ie *) 792 (bcn->tail + ifmsh->meshconf_offset); 793 794 dev_kfree_skb(skb); 795 rcu_assign_pointer(ifmsh->beacon, bcn); 796 return 0; 797 out_free: 798 kfree(bcn); 799 dev_kfree_skb(skb); 800 return -ENOMEM; 801 } 802 803 static int 804 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata) 805 { 806 struct beacon_data *old_bcn; 807 int ret; 808 809 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon, 810 lockdep_is_held(&sdata->wdev.mtx)); 811 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh); 812 if (ret) 813 /* just reuse old beacon */ 814 return ret; 815 816 if (old_bcn) 817 kfree_rcu(old_bcn, rcu_head); 818 return 0; 819 } 820 821 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 822 u32 changed) 823 { 824 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 825 unsigned long bits = changed; 826 u32 bit; 827 828 if (!bits) 829 return; 830 831 /* if we race with running work, worst case this work becomes a noop */ 832 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE) 833 set_bit(bit, &ifmsh->mbss_changed); 834 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags); 835 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 836 } 837 838 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 839 { 840 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 841 struct ieee80211_local *local = sdata->local; 842 u32 changed = BSS_CHANGED_BEACON | 843 BSS_CHANGED_BEACON_ENABLED | 844 BSS_CHANGED_HT | 845 BSS_CHANGED_BASIC_RATES | 846 BSS_CHANGED_BEACON_INT; 847 848 local->fif_other_bss++; 849 /* mesh ifaces must set allmulti to forward mcast traffic */ 850 atomic_inc(&local->iff_allmultis); 851 ieee80211_configure_filter(local); 852 853 ifmsh->mesh_cc_id = 0; /* Disabled */ 854 /* register sync ops from extensible synchronization framework */ 855 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id); 856 ifmsh->sync_offset_clockdrift_max = 0; 857 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 858 ieee80211_mesh_root_setup(ifmsh); 859 ieee80211_queue_work(&local->hw, &sdata->work); 860 sdata->vif.bss_conf.ht_operation_mode = 861 ifmsh->mshcfg.ht_opmode; 862 sdata->vif.bss_conf.enable_beacon = true; 863 864 changed |= ieee80211_mps_local_status_update(sdata); 865 866 if (ieee80211_mesh_build_beacon(ifmsh)) { 867 ieee80211_stop_mesh(sdata); 868 return -ENOMEM; 869 } 870 871 ieee80211_recalc_dtim(local, sdata); 872 ieee80211_bss_info_change_notify(sdata, changed); 873 874 netif_carrier_on(sdata->dev); 875 return 0; 876 } 877 878 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 879 { 880 struct ieee80211_local *local = sdata->local; 881 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 882 struct beacon_data *bcn; 883 884 netif_carrier_off(sdata->dev); 885 886 /* flush STAs and mpaths on this iface */ 887 sta_info_flush(sdata); 888 mesh_path_flush_by_iface(sdata); 889 890 /* stop the beacon */ 891 ifmsh->mesh_id_len = 0; 892 sdata->vif.bss_conf.enable_beacon = false; 893 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 894 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); 895 896 /* remove beacon */ 897 bcn = rcu_dereference_protected(ifmsh->beacon, 898 lockdep_is_held(&sdata->wdev.mtx)); 899 RCU_INIT_POINTER(ifmsh->beacon, NULL); 900 kfree_rcu(bcn, rcu_head); 901 902 /* free all potentially still buffered group-addressed frames */ 903 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf); 904 skb_queue_purge(&ifmsh->ps.bc_buf); 905 906 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 907 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 908 del_timer_sync(&sdata->u.mesh.mesh_path_timer); 909 910 /* clear any mesh work (for next join) we may have accrued */ 911 ifmsh->wrkq_flags = 0; 912 ifmsh->mbss_changed = 0; 913 914 local->fif_other_bss--; 915 atomic_dec(&local->iff_allmultis); 916 ieee80211_configure_filter(local); 917 } 918 919 static bool 920 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata, 921 struct ieee802_11_elems *elems, bool beacon) 922 { 923 struct cfg80211_csa_settings params; 924 struct ieee80211_csa_ie csa_ie; 925 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 926 struct ieee80211_supported_band *sband; 927 int err; 928 u32 sta_flags; 929 930 sdata_assert_lock(sdata); 931 932 sband = ieee80211_get_sband(sdata); 933 if (!sband) 934 return false; 935 936 sta_flags = IEEE80211_STA_DISABLE_VHT; 937 switch (sdata->vif.bss_conf.chandef.width) { 938 case NL80211_CHAN_WIDTH_20_NOHT: 939 sta_flags |= IEEE80211_STA_DISABLE_HT; 940 case NL80211_CHAN_WIDTH_20: 941 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 942 break; 943 default: 944 break; 945 } 946 947 memset(¶ms, 0, sizeof(params)); 948 memset(&csa_ie, 0, sizeof(csa_ie)); 949 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band, 950 sta_flags, sdata->vif.addr, 951 &csa_ie); 952 if (err < 0) 953 return false; 954 if (err) 955 return false; 956 957 params.chandef = csa_ie.chandef; 958 params.count = csa_ie.count; 959 960 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, 961 IEEE80211_CHAN_DISABLED)) { 962 sdata_info(sdata, 963 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 964 sdata->vif.addr, 965 params.chandef.chan->center_freq, 966 params.chandef.width, 967 params.chandef.center_freq1, 968 params.chandef.center_freq2); 969 return false; 970 } 971 972 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 973 ¶ms.chandef, 974 NL80211_IFTYPE_MESH_POINT); 975 if (err < 0) 976 return false; 977 if (err > 0) 978 /* TODO: DFS not (yet) supported */ 979 return false; 980 981 params.radar_required = err; 982 983 if (cfg80211_chandef_identical(¶ms.chandef, 984 &sdata->vif.bss_conf.chandef)) { 985 mcsa_dbg(sdata, 986 "received csa with an identical chandef, ignoring\n"); 987 return true; 988 } 989 990 mcsa_dbg(sdata, 991 "received channel switch announcement to go to channel %d MHz\n", 992 params.chandef.chan->center_freq); 993 994 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT; 995 if (beacon) { 996 ifmsh->chsw_ttl = csa_ie.ttl - 1; 997 if (ifmsh->pre_value >= csa_ie.pre_value) 998 return false; 999 ifmsh->pre_value = csa_ie.pre_value; 1000 } 1001 1002 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) 1003 return false; 1004 1005 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; 1006 1007 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 1008 ¶ms) < 0) 1009 return false; 1010 1011 return true; 1012 } 1013 1014 static void 1015 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, 1016 struct ieee80211_mgmt *mgmt, size_t len) 1017 { 1018 struct ieee80211_local *local = sdata->local; 1019 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1020 struct sk_buff *presp; 1021 struct beacon_data *bcn; 1022 struct ieee80211_mgmt *hdr; 1023 struct ieee802_11_elems elems; 1024 size_t baselen; 1025 u8 *pos; 1026 1027 pos = mgmt->u.probe_req.variable; 1028 baselen = (u8 *) pos - (u8 *) mgmt; 1029 if (baselen > len) 1030 return; 1031 1032 ieee802_11_parse_elems(pos, len - baselen, false, &elems); 1033 1034 if (!elems.mesh_id) 1035 return; 1036 1037 /* 802.11-2012 10.1.4.3.2 */ 1038 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && 1039 !is_broadcast_ether_addr(mgmt->da)) || 1040 elems.ssid_len != 0) 1041 return; 1042 1043 if (elems.mesh_id_len != 0 && 1044 (elems.mesh_id_len != ifmsh->mesh_id_len || 1045 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) 1046 return; 1047 1048 rcu_read_lock(); 1049 bcn = rcu_dereference(ifmsh->beacon); 1050 1051 if (!bcn) 1052 goto out; 1053 1054 presp = dev_alloc_skb(local->tx_headroom + 1055 bcn->head_len + bcn->tail_len); 1056 if (!presp) 1057 goto out; 1058 1059 skb_reserve(presp, local->tx_headroom); 1060 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len); 1061 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len); 1062 hdr = (struct ieee80211_mgmt *) presp->data; 1063 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1064 IEEE80211_STYPE_PROBE_RESP); 1065 memcpy(hdr->da, mgmt->sa, ETH_ALEN); 1066 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1067 ieee80211_tx_skb(sdata, presp); 1068 out: 1069 rcu_read_unlock(); 1070 } 1071 1072 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 1073 u16 stype, 1074 struct ieee80211_mgmt *mgmt, 1075 size_t len, 1076 struct ieee80211_rx_status *rx_status) 1077 { 1078 struct ieee80211_local *local = sdata->local; 1079 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1080 struct ieee802_11_elems elems; 1081 struct ieee80211_channel *channel; 1082 size_t baselen; 1083 int freq; 1084 enum nl80211_band band = rx_status->band; 1085 1086 /* ignore ProbeResp to foreign address */ 1087 if (stype == IEEE80211_STYPE_PROBE_RESP && 1088 !ether_addr_equal(mgmt->da, sdata->vif.addr)) 1089 return; 1090 1091 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1092 if (baselen > len) 1093 return; 1094 1095 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1096 false, &elems); 1097 1098 /* ignore non-mesh or secure / unsecure mismatch */ 1099 if ((!elems.mesh_id || !elems.mesh_config) || 1100 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) || 1101 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)) 1102 return; 1103 1104 if (elems.ds_params) 1105 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band); 1106 else 1107 freq = rx_status->freq; 1108 1109 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1110 1111 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1112 return; 1113 1114 if (mesh_matches_local(sdata, &elems)) { 1115 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n", 1116 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal); 1117 if (!sdata->u.mesh.user_mpm || 1118 sdata->u.mesh.mshcfg.rssi_threshold == 0 || 1119 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal) 1120 mesh_neighbour_update(sdata, mgmt->sa, &elems); 1121 } 1122 1123 if (ifmsh->sync_ops) 1124 ifmsh->sync_ops->rx_bcn_presp(sdata, 1125 stype, mgmt, &elems, rx_status); 1126 1127 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && 1128 !sdata->vif.csa_active) 1129 ieee80211_mesh_process_chnswitch(sdata, &elems, true); 1130 } 1131 1132 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata) 1133 { 1134 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1135 struct mesh_csa_settings *tmp_csa_settings; 1136 int ret = 0; 1137 int changed = 0; 1138 1139 /* Reset the TTL value and Initiator flag */ 1140 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1141 ifmsh->chsw_ttl = 0; 1142 1143 /* Remove the CSA and MCSP elements from the beacon */ 1144 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1145 RCU_INIT_POINTER(ifmsh->csa, NULL); 1146 if (tmp_csa_settings) 1147 kfree_rcu(tmp_csa_settings, rcu_head); 1148 ret = ieee80211_mesh_rebuild_beacon(sdata); 1149 if (ret) 1150 return -EINVAL; 1151 1152 changed |= BSS_CHANGED_BEACON; 1153 1154 mcsa_dbg(sdata, "complete switching to center freq %d MHz", 1155 sdata->vif.bss_conf.chandef.chan->center_freq); 1156 return changed; 1157 } 1158 1159 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, 1160 struct cfg80211_csa_settings *csa_settings) 1161 { 1162 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1163 struct mesh_csa_settings *tmp_csa_settings; 1164 int ret = 0; 1165 1166 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings), 1167 GFP_ATOMIC); 1168 if (!tmp_csa_settings) 1169 return -ENOMEM; 1170 1171 memcpy(&tmp_csa_settings->settings, csa_settings, 1172 sizeof(struct cfg80211_csa_settings)); 1173 1174 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings); 1175 1176 ret = ieee80211_mesh_rebuild_beacon(sdata); 1177 if (ret) { 1178 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1179 RCU_INIT_POINTER(ifmsh->csa, NULL); 1180 kfree_rcu(tmp_csa_settings, rcu_head); 1181 return ret; 1182 } 1183 1184 return BSS_CHANGED_BEACON; 1185 } 1186 1187 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata, 1188 struct ieee80211_mgmt *mgmt, size_t len) 1189 { 1190 struct ieee80211_mgmt *mgmt_fwd; 1191 struct sk_buff *skb; 1192 struct ieee80211_local *local = sdata->local; 1193 u8 *pos = mgmt->u.action.u.chan_switch.variable; 1194 size_t offset_ttl; 1195 1196 skb = dev_alloc_skb(local->tx_headroom + len); 1197 if (!skb) 1198 return -ENOMEM; 1199 skb_reserve(skb, local->tx_headroom); 1200 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len); 1201 1202 /* offset_ttl is based on whether the secondary channel 1203 * offset is available or not. Subtract 1 from the mesh TTL 1204 * and disable the initiator flag before forwarding. 1205 */ 1206 offset_ttl = (len < 42) ? 7 : 10; 1207 *(pos + offset_ttl) -= 1; 1208 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 1209 1210 memcpy(mgmt_fwd, mgmt, len); 1211 eth_broadcast_addr(mgmt_fwd->da); 1212 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN); 1213 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN); 1214 1215 ieee80211_tx_skb(sdata, skb); 1216 return 0; 1217 } 1218 1219 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata, 1220 struct ieee80211_mgmt *mgmt, size_t len) 1221 { 1222 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1223 struct ieee802_11_elems elems; 1224 u16 pre_value; 1225 bool fwd_csa = true; 1226 size_t baselen; 1227 u8 *pos; 1228 1229 if (mgmt->u.action.u.measurement.action_code != 1230 WLAN_ACTION_SPCT_CHL_SWITCH) 1231 return; 1232 1233 pos = mgmt->u.action.u.chan_switch.variable; 1234 baselen = offsetof(struct ieee80211_mgmt, 1235 u.action.u.chan_switch.variable); 1236 ieee802_11_parse_elems(pos, len - baselen, false, &elems); 1237 1238 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl; 1239 if (!--ifmsh->chsw_ttl) 1240 fwd_csa = false; 1241 1242 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value); 1243 if (ifmsh->pre_value >= pre_value) 1244 return; 1245 1246 ifmsh->pre_value = pre_value; 1247 1248 if (!sdata->vif.csa_active && 1249 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) { 1250 mcsa_dbg(sdata, "Failed to process CSA action frame"); 1251 return; 1252 } 1253 1254 /* forward or re-broadcast the CSA frame */ 1255 if (fwd_csa) { 1256 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0) 1257 mcsa_dbg(sdata, "Failed to forward the CSA frame"); 1258 } 1259 } 1260 1261 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 1262 struct ieee80211_mgmt *mgmt, 1263 size_t len, 1264 struct ieee80211_rx_status *rx_status) 1265 { 1266 switch (mgmt->u.action.category) { 1267 case WLAN_CATEGORY_SELF_PROTECTED: 1268 switch (mgmt->u.action.u.self_prot.action_code) { 1269 case WLAN_SP_MESH_PEERING_OPEN: 1270 case WLAN_SP_MESH_PEERING_CLOSE: 1271 case WLAN_SP_MESH_PEERING_CONFIRM: 1272 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 1273 break; 1274 } 1275 break; 1276 case WLAN_CATEGORY_MESH_ACTION: 1277 if (mesh_action_is_path_sel(mgmt)) 1278 mesh_rx_path_sel_frame(sdata, mgmt, len); 1279 break; 1280 case WLAN_CATEGORY_SPECTRUM_MGMT: 1281 mesh_rx_csa_frame(sdata, mgmt, len); 1282 break; 1283 } 1284 } 1285 1286 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1287 struct sk_buff *skb) 1288 { 1289 struct ieee80211_rx_status *rx_status; 1290 struct ieee80211_mgmt *mgmt; 1291 u16 stype; 1292 1293 sdata_lock(sdata); 1294 1295 /* mesh already went down */ 1296 if (!sdata->u.mesh.mesh_id_len) 1297 goto out; 1298 1299 rx_status = IEEE80211_SKB_RXCB(skb); 1300 mgmt = (struct ieee80211_mgmt *) skb->data; 1301 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 1302 1303 switch (stype) { 1304 case IEEE80211_STYPE_PROBE_RESP: 1305 case IEEE80211_STYPE_BEACON: 1306 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 1307 rx_status); 1308 break; 1309 case IEEE80211_STYPE_PROBE_REQ: 1310 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); 1311 break; 1312 case IEEE80211_STYPE_ACTION: 1313 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 1314 break; 1315 } 1316 out: 1317 sdata_unlock(sdata); 1318 } 1319 1320 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) 1321 { 1322 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1323 u32 bit, changed = 0; 1324 1325 for_each_set_bit(bit, &ifmsh->mbss_changed, 1326 sizeof(changed) * BITS_PER_BYTE) { 1327 clear_bit(bit, &ifmsh->mbss_changed); 1328 changed |= BIT(bit); 1329 } 1330 1331 if (sdata->vif.bss_conf.enable_beacon && 1332 (changed & (BSS_CHANGED_BEACON | 1333 BSS_CHANGED_HT | 1334 BSS_CHANGED_BASIC_RATES | 1335 BSS_CHANGED_BEACON_INT))) 1336 if (ieee80211_mesh_rebuild_beacon(sdata)) 1337 return; 1338 1339 ieee80211_bss_info_change_notify(sdata, changed); 1340 } 1341 1342 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 1343 { 1344 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1345 1346 sdata_lock(sdata); 1347 1348 /* mesh already went down */ 1349 if (!sdata->u.mesh.mesh_id_len) 1350 goto out; 1351 1352 if (ifmsh->preq_queue_len && 1353 time_after(jiffies, 1354 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 1355 mesh_path_start_discovery(sdata); 1356 1357 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 1358 ieee80211_mesh_housekeeping(sdata); 1359 1360 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 1361 ieee80211_mesh_rootpath(sdata); 1362 1363 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags)) 1364 mesh_sync_adjust_tsf(sdata); 1365 1366 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) 1367 mesh_bss_info_changed(sdata); 1368 out: 1369 sdata_unlock(sdata); 1370 } 1371 1372 1373 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 1374 { 1375 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1376 static u8 zero_addr[ETH_ALEN] = {}; 1377 1378 setup_timer(&ifmsh->housekeeping_timer, 1379 ieee80211_mesh_housekeeping_timer, 1380 (unsigned long) sdata); 1381 1382 ifmsh->accepting_plinks = true; 1383 atomic_set(&ifmsh->mpaths, 0); 1384 mesh_rmc_init(sdata); 1385 ifmsh->last_preq = jiffies; 1386 ifmsh->next_perr = jiffies; 1387 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1388 /* Allocate all mesh structures when creating the first mesh interface. */ 1389 if (!mesh_allocated) 1390 ieee80211s_init(); 1391 1392 mesh_pathtbl_init(sdata); 1393 1394 setup_timer(&ifmsh->mesh_path_timer, 1395 ieee80211_mesh_path_timer, 1396 (unsigned long) sdata); 1397 setup_timer(&ifmsh->mesh_path_root_timer, 1398 ieee80211_mesh_path_root_timer, 1399 (unsigned long) sdata); 1400 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 1401 skb_queue_head_init(&ifmsh->ps.bc_buf); 1402 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 1403 spin_lock_init(&ifmsh->sync_offset_lock); 1404 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1405 1406 sdata->vif.bss_conf.bssid = zero_addr; 1407 } 1408 1409 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1410 { 1411 mesh_rmc_free(sdata); 1412 mesh_pathtbl_unregister(sdata); 1413 } 1414