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