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 /* make sure no readers can access nexthop sta from here on */ 165 mesh_path_flush_by_nexthop(sta); 166 synchronize_net(); 167 168 if (changed) 169 ieee80211_mbss_info_change_notify(sdata, changed); 170 } 171 172 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) 173 { 174 int i; 175 176 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); 177 if (!sdata->u.mesh.rmc) 178 return -ENOMEM; 179 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; 180 for (i = 0; i < RMC_BUCKETS; i++) 181 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]); 182 return 0; 183 } 184 185 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) 186 { 187 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 188 struct rmc_entry *p; 189 struct hlist_node *n; 190 int i; 191 192 if (!sdata->u.mesh.rmc) 193 return; 194 195 for (i = 0; i < RMC_BUCKETS; i++) { 196 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) { 197 hlist_del(&p->list); 198 kmem_cache_free(rm_cache, p); 199 } 200 } 201 202 kfree(rmc); 203 sdata->u.mesh.rmc = NULL; 204 } 205 206 /** 207 * mesh_rmc_check - Check frame in recent multicast cache and add if absent. 208 * 209 * @sdata: interface 210 * @sa: source address 211 * @mesh_hdr: mesh_header 212 * 213 * Returns: 0 if the frame is not in the cache, nonzero otherwise. 214 * 215 * Checks using the source address and the mesh sequence number if we have 216 * received this frame lately. If the frame is not in the cache, it is added to 217 * it. 218 */ 219 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 220 const u8 *sa, struct ieee80211s_hdr *mesh_hdr) 221 { 222 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 223 u32 seqnum = 0; 224 int entries = 0; 225 u8 idx; 226 struct rmc_entry *p; 227 struct hlist_node *n; 228 229 if (!rmc) 230 return -1; 231 232 /* Don't care about endianness since only match matters */ 233 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); 234 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; 235 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) { 236 ++entries; 237 if (time_after(jiffies, p->exp_time) || 238 entries == RMC_QUEUE_MAX_LEN) { 239 hlist_del(&p->list); 240 kmem_cache_free(rm_cache, p); 241 --entries; 242 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa)) 243 return -1; 244 } 245 246 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); 247 if (!p) 248 return 0; 249 250 p->seqnum = seqnum; 251 p->exp_time = jiffies + RMC_TIMEOUT; 252 memcpy(p->sa, sa, ETH_ALEN); 253 hlist_add_head(&p->list, &rmc->bucket[idx]); 254 return 0; 255 } 256 257 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 258 struct sk_buff *skb) 259 { 260 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 261 u8 *pos, neighbors; 262 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie); 263 264 if (skb_tailroom(skb) < 2 + meshconf_len) 265 return -ENOMEM; 266 267 pos = skb_put(skb, 2 + meshconf_len); 268 *pos++ = WLAN_EID_MESH_CONFIG; 269 *pos++ = meshconf_len; 270 271 /* save a pointer for quick updates in pre-tbtt */ 272 ifmsh->meshconf_offset = pos - skb->data; 273 274 /* Active path selection protocol ID */ 275 *pos++ = ifmsh->mesh_pp_id; 276 /* Active path selection metric ID */ 277 *pos++ = ifmsh->mesh_pm_id; 278 /* Congestion control mode identifier */ 279 *pos++ = ifmsh->mesh_cc_id; 280 /* Synchronization protocol identifier */ 281 *pos++ = ifmsh->mesh_sp_id; 282 /* Authentication Protocol identifier */ 283 *pos++ = ifmsh->mesh_auth_id; 284 /* Mesh Formation Info - number of neighbors */ 285 neighbors = atomic_read(&ifmsh->estab_plinks); 286 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS); 287 *pos++ = neighbors << 1; 288 /* Mesh capability */ 289 *pos = 0x00; 290 *pos |= ifmsh->mshcfg.dot11MeshForwarding ? 291 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00; 292 *pos |= ifmsh->accepting_plinks ? 293 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; 294 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */ 295 *pos |= ifmsh->ps_peers_deep_sleep ? 296 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00; 297 *pos++ |= ifmsh->adjusting_tbtt ? 298 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00; 299 *pos++ = 0x00; 300 301 return 0; 302 } 303 304 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 305 { 306 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 307 u8 *pos; 308 309 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len) 310 return -ENOMEM; 311 312 pos = skb_put(skb, 2 + ifmsh->mesh_id_len); 313 *pos++ = WLAN_EID_MESH_ID; 314 *pos++ = ifmsh->mesh_id_len; 315 if (ifmsh->mesh_id_len) 316 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len); 317 318 return 0; 319 } 320 321 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata, 322 struct sk_buff *skb) 323 { 324 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 325 u8 *pos; 326 327 /* see IEEE802.11-2012 13.14.6 */ 328 if (ifmsh->ps_peers_light_sleep == 0 && 329 ifmsh->ps_peers_deep_sleep == 0 && 330 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE) 331 return 0; 332 333 if (skb_tailroom(skb) < 4) 334 return -ENOMEM; 335 336 pos = skb_put(skb, 2 + 2); 337 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW; 338 *pos++ = 2; 339 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos); 340 341 return 0; 342 } 343 344 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 345 struct sk_buff *skb) 346 { 347 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 348 u8 offset, len; 349 const u8 *data; 350 351 if (!ifmsh->ie || !ifmsh->ie_len) 352 return 0; 353 354 /* fast-forward to vendor IEs */ 355 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0); 356 357 if (offset) { 358 len = ifmsh->ie_len - offset; 359 data = ifmsh->ie + offset; 360 if (skb_tailroom(skb) < len) 361 return -ENOMEM; 362 memcpy(skb_put(skb, len), data, len); 363 } 364 365 return 0; 366 } 367 368 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 369 { 370 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 371 u8 len = 0; 372 const u8 *data; 373 374 if (!ifmsh->ie || !ifmsh->ie_len) 375 return 0; 376 377 /* find RSN IE */ 378 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len); 379 if (!data) 380 return 0; 381 382 len = data[1] + 2; 383 384 if (skb_tailroom(skb) < len) 385 return -ENOMEM; 386 memcpy(skb_put(skb, len), data, len); 387 388 return 0; 389 } 390 391 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata, 392 struct sk_buff *skb) 393 { 394 struct ieee80211_chanctx_conf *chanctx_conf; 395 struct ieee80211_channel *chan; 396 u8 *pos; 397 398 if (skb_tailroom(skb) < 3) 399 return -ENOMEM; 400 401 rcu_read_lock(); 402 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 403 if (WARN_ON(!chanctx_conf)) { 404 rcu_read_unlock(); 405 return -EINVAL; 406 } 407 chan = chanctx_conf->def.chan; 408 rcu_read_unlock(); 409 410 pos = skb_put(skb, 2 + 1); 411 *pos++ = WLAN_EID_DS_PARAMS; 412 *pos++ = 1; 413 *pos++ = ieee80211_frequency_to_channel(chan->center_freq); 414 415 return 0; 416 } 417 418 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 419 struct sk_buff *skb) 420 { 421 struct ieee80211_local *local = sdata->local; 422 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 423 struct ieee80211_supported_band *sband; 424 u8 *pos; 425 426 sband = local->hw.wiphy->bands[band]; 427 if (!sband->ht_cap.ht_supported || 428 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 429 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 430 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 431 return 0; 432 433 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap)) 434 return -ENOMEM; 435 436 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap)); 437 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap); 438 439 return 0; 440 } 441 442 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 443 struct sk_buff *skb) 444 { 445 struct ieee80211_local *local = sdata->local; 446 struct ieee80211_chanctx_conf *chanctx_conf; 447 struct ieee80211_channel *channel; 448 struct ieee80211_supported_band *sband; 449 struct ieee80211_sta_ht_cap *ht_cap; 450 u8 *pos; 451 452 rcu_read_lock(); 453 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 454 if (WARN_ON(!chanctx_conf)) { 455 rcu_read_unlock(); 456 return -EINVAL; 457 } 458 channel = chanctx_conf->def.chan; 459 rcu_read_unlock(); 460 461 sband = local->hw.wiphy->bands[channel->band]; 462 ht_cap = &sband->ht_cap; 463 464 if (!ht_cap->ht_supported || 465 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 466 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 467 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 468 return 0; 469 470 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation)) 471 return -ENOMEM; 472 473 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 474 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef, 475 sdata->vif.bss_conf.ht_operation_mode, 476 false); 477 478 return 0; 479 } 480 481 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, 482 struct sk_buff *skb) 483 { 484 struct ieee80211_local *local = sdata->local; 485 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 486 struct ieee80211_supported_band *sband; 487 u8 *pos; 488 489 sband = local->hw.wiphy->bands[band]; 490 if (!sband->vht_cap.vht_supported || 491 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 492 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 493 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 494 return 0; 495 496 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap)) 497 return -ENOMEM; 498 499 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap)); 500 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap); 501 502 return 0; 503 } 504 505 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, 506 struct sk_buff *skb) 507 { 508 struct ieee80211_local *local = sdata->local; 509 struct ieee80211_chanctx_conf *chanctx_conf; 510 struct ieee80211_channel *channel; 511 struct ieee80211_supported_band *sband; 512 struct ieee80211_sta_vht_cap *vht_cap; 513 u8 *pos; 514 515 rcu_read_lock(); 516 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 517 if (WARN_ON(!chanctx_conf)) { 518 rcu_read_unlock(); 519 return -EINVAL; 520 } 521 channel = chanctx_conf->def.chan; 522 rcu_read_unlock(); 523 524 sband = local->hw.wiphy->bands[channel->band]; 525 vht_cap = &sband->vht_cap; 526 527 if (!vht_cap->vht_supported || 528 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 529 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 530 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 531 return 0; 532 533 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation)) 534 return -ENOMEM; 535 536 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 537 ieee80211_ie_build_vht_oper(pos, vht_cap, 538 &sdata->vif.bss_conf.chandef); 539 540 return 0; 541 } 542 543 static void ieee80211_mesh_path_timer(unsigned long data) 544 { 545 struct ieee80211_sub_if_data *sdata = 546 (struct ieee80211_sub_if_data *) data; 547 548 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 549 } 550 551 static void ieee80211_mesh_path_root_timer(unsigned long data) 552 { 553 struct ieee80211_sub_if_data *sdata = 554 (struct ieee80211_sub_if_data *) data; 555 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 556 557 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 558 559 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 560 } 561 562 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh) 563 { 564 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT) 565 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 566 else { 567 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 568 /* stop running timer */ 569 del_timer_sync(&ifmsh->mesh_path_root_timer); 570 } 571 } 572 573 /** 574 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame 575 * @hdr: 802.11 frame header 576 * @fc: frame control field 577 * @meshda: destination address in the mesh 578 * @meshsa: source address address in the mesh. Same as TA, as frame is 579 * locally originated. 580 * 581 * Return the length of the 802.11 (does not include a mesh control header) 582 */ 583 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 584 const u8 *meshda, const u8 *meshsa) 585 { 586 if (is_multicast_ether_addr(meshda)) { 587 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 588 /* DA TA SA */ 589 memcpy(hdr->addr1, meshda, ETH_ALEN); 590 memcpy(hdr->addr2, meshsa, ETH_ALEN); 591 memcpy(hdr->addr3, meshsa, ETH_ALEN); 592 return 24; 593 } else { 594 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 595 /* RA TA DA SA */ 596 eth_zero_addr(hdr->addr1); /* RA is resolved later */ 597 memcpy(hdr->addr2, meshsa, ETH_ALEN); 598 memcpy(hdr->addr3, meshda, ETH_ALEN); 599 memcpy(hdr->addr4, meshsa, ETH_ALEN); 600 return 30; 601 } 602 } 603 604 /** 605 * ieee80211_new_mesh_header - create a new mesh header 606 * @sdata: mesh interface to be used 607 * @meshhdr: uninitialized mesh header 608 * @addr4or5: 1st address in the ae header, which may correspond to address 4 609 * (if addr6 is NULL) or address 5 (if addr6 is present). It may 610 * be NULL. 611 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the 612 * mesh frame 613 * 614 * Return the header length. 615 */ 616 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 617 struct ieee80211s_hdr *meshhdr, 618 const char *addr4or5, const char *addr6) 619 { 620 if (WARN_ON(!addr4or5 && addr6)) 621 return 0; 622 623 memset(meshhdr, 0, sizeof(*meshhdr)); 624 625 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; 626 627 /* FIXME: racy -- TX on multiple queues can be concurrent */ 628 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); 629 sdata->u.mesh.mesh_seqnum++; 630 631 if (addr4or5 && !addr6) { 632 meshhdr->flags |= MESH_FLAGS_AE_A4; 633 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 634 return 2 * ETH_ALEN; 635 } else if (addr4or5 && addr6) { 636 meshhdr->flags |= MESH_FLAGS_AE_A5_A6; 637 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 638 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); 639 return 3 * ETH_ALEN; 640 } 641 642 return ETH_ALEN; 643 } 644 645 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata) 646 { 647 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 648 u32 changed; 649 650 if (ifmsh->mshcfg.plink_timeout > 0) 651 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ); 652 mesh_path_expire(sdata); 653 654 changed = mesh_accept_plinks_update(sdata); 655 ieee80211_mbss_info_change_notify(sdata, changed); 656 657 mod_timer(&ifmsh->housekeeping_timer, 658 round_jiffies(jiffies + 659 IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); 660 } 661 662 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) 663 { 664 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 665 u32 interval; 666 667 mesh_path_tx_root_frame(sdata); 668 669 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN) 670 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; 671 else 672 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval; 673 674 mod_timer(&ifmsh->mesh_path_root_timer, 675 round_jiffies(TU_TO_EXP_TIME(interval))); 676 } 677 678 static int 679 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh) 680 { 681 struct beacon_data *bcn; 682 int head_len, tail_len; 683 struct sk_buff *skb; 684 struct ieee80211_mgmt *mgmt; 685 struct ieee80211_chanctx_conf *chanctx_conf; 686 struct mesh_csa_settings *csa; 687 enum nl80211_band band; 688 u8 *pos; 689 struct ieee80211_sub_if_data *sdata; 690 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 691 sizeof(mgmt->u.beacon); 692 693 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh); 694 rcu_read_lock(); 695 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 696 band = chanctx_conf->def.chan->band; 697 rcu_read_unlock(); 698 699 head_len = hdr_len + 700 2 + /* NULL SSID */ 701 /* Channel Switch Announcement */ 702 2 + sizeof(struct ieee80211_channel_sw_ie) + 703 /* Mesh Channel Swith Parameters */ 704 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) + 705 2 + 8 + /* supported rates */ 706 2 + 3; /* DS params */ 707 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 708 2 + sizeof(struct ieee80211_ht_cap) + 709 2 + sizeof(struct ieee80211_ht_operation) + 710 2 + ifmsh->mesh_id_len + 711 2 + sizeof(struct ieee80211_meshconf_ie) + 712 2 + sizeof(__le16) + /* awake window */ 713 2 + sizeof(struct ieee80211_vht_cap) + 714 2 + sizeof(struct ieee80211_vht_operation) + 715 ifmsh->ie_len; 716 717 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL); 718 /* need an skb for IE builders to operate on */ 719 skb = dev_alloc_skb(max(head_len, tail_len)); 720 721 if (!bcn || !skb) 722 goto out_free; 723 724 /* 725 * pointers go into the block we allocated, 726 * memory is | beacon_data | head | tail | 727 */ 728 bcn->head = ((u8 *) bcn) + sizeof(*bcn); 729 730 /* fill in the head */ 731 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 732 memset(mgmt, 0, hdr_len); 733 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 734 IEEE80211_STYPE_BEACON); 735 eth_broadcast_addr(mgmt->da); 736 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 737 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 738 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt); 739 mgmt->u.beacon.beacon_int = 740 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 741 mgmt->u.beacon.capab_info |= cpu_to_le16( 742 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 743 744 pos = skb_put(skb, 2); 745 *pos++ = WLAN_EID_SSID; 746 *pos++ = 0x0; 747 748 rcu_read_lock(); 749 csa = rcu_dereference(ifmsh->csa); 750 if (csa) { 751 pos = skb_put(skb, 13); 752 memset(pos, 0, 13); 753 *pos++ = WLAN_EID_CHANNEL_SWITCH; 754 *pos++ = 3; 755 *pos++ = 0x0; 756 *pos++ = ieee80211_frequency_to_channel( 757 csa->settings.chandef.chan->center_freq); 758 bcn->csa_current_counter = csa->settings.count; 759 bcn->csa_counter_offsets[0] = hdr_len + 6; 760 *pos++ = csa->settings.count; 761 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; 762 *pos++ = 6; 763 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) { 764 *pos++ = ifmsh->mshcfg.dot11MeshTTL; 765 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 766 } else { 767 *pos++ = ifmsh->chsw_ttl; 768 } 769 *pos++ |= csa->settings.block_tx ? 770 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00; 771 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); 772 pos += 2; 773 put_unaligned_le16(ifmsh->pre_value, pos); 774 pos += 2; 775 } 776 rcu_read_unlock(); 777 778 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 779 mesh_add_ds_params_ie(sdata, skb)) 780 goto out_free; 781 782 bcn->head_len = skb->len; 783 memcpy(bcn->head, skb->data, bcn->head_len); 784 785 /* now the tail */ 786 skb_trim(skb, 0); 787 bcn->tail = bcn->head + bcn->head_len; 788 789 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 790 mesh_add_rsn_ie(sdata, skb) || 791 mesh_add_ht_cap_ie(sdata, skb) || 792 mesh_add_ht_oper_ie(sdata, skb) || 793 mesh_add_meshid_ie(sdata, skb) || 794 mesh_add_meshconf_ie(sdata, skb) || 795 mesh_add_awake_window_ie(sdata, skb) || 796 mesh_add_vht_cap_ie(sdata, skb) || 797 mesh_add_vht_oper_ie(sdata, skb) || 798 mesh_add_vendor_ies(sdata, skb)) 799 goto out_free; 800 801 bcn->tail_len = skb->len; 802 memcpy(bcn->tail, skb->data, bcn->tail_len); 803 bcn->meshconf = (struct ieee80211_meshconf_ie *) 804 (bcn->tail + ifmsh->meshconf_offset); 805 806 dev_kfree_skb(skb); 807 rcu_assign_pointer(ifmsh->beacon, bcn); 808 return 0; 809 out_free: 810 kfree(bcn); 811 dev_kfree_skb(skb); 812 return -ENOMEM; 813 } 814 815 static int 816 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata) 817 { 818 struct beacon_data *old_bcn; 819 int ret; 820 821 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon, 822 lockdep_is_held(&sdata->wdev.mtx)); 823 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh); 824 if (ret) 825 /* just reuse old beacon */ 826 return ret; 827 828 if (old_bcn) 829 kfree_rcu(old_bcn, rcu_head); 830 return 0; 831 } 832 833 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 834 u32 changed) 835 { 836 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 837 unsigned long bits = changed; 838 u32 bit; 839 840 if (!bits) 841 return; 842 843 /* if we race with running work, worst case this work becomes a noop */ 844 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE) 845 set_bit(bit, &ifmsh->mbss_changed); 846 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags); 847 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 848 } 849 850 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 851 { 852 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 853 struct ieee80211_local *local = sdata->local; 854 u32 changed = BSS_CHANGED_BEACON | 855 BSS_CHANGED_BEACON_ENABLED | 856 BSS_CHANGED_HT | 857 BSS_CHANGED_BASIC_RATES | 858 BSS_CHANGED_BEACON_INT; 859 860 local->fif_other_bss++; 861 /* mesh ifaces must set allmulti to forward mcast traffic */ 862 atomic_inc(&local->iff_allmultis); 863 ieee80211_configure_filter(local); 864 865 ifmsh->mesh_cc_id = 0; /* Disabled */ 866 /* register sync ops from extensible synchronization framework */ 867 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id); 868 ifmsh->adjusting_tbtt = false; 869 ifmsh->sync_offset_clockdrift_max = 0; 870 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 871 ieee80211_mesh_root_setup(ifmsh); 872 ieee80211_queue_work(&local->hw, &sdata->work); 873 sdata->vif.bss_conf.ht_operation_mode = 874 ifmsh->mshcfg.ht_opmode; 875 sdata->vif.bss_conf.enable_beacon = true; 876 877 changed |= ieee80211_mps_local_status_update(sdata); 878 879 if (ieee80211_mesh_build_beacon(ifmsh)) { 880 ieee80211_stop_mesh(sdata); 881 return -ENOMEM; 882 } 883 884 ieee80211_recalc_dtim(local, sdata); 885 ieee80211_bss_info_change_notify(sdata, changed); 886 887 netif_carrier_on(sdata->dev); 888 return 0; 889 } 890 891 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 892 { 893 struct ieee80211_local *local = sdata->local; 894 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 895 struct beacon_data *bcn; 896 897 netif_carrier_off(sdata->dev); 898 899 /* stop the beacon */ 900 ifmsh->mesh_id_len = 0; 901 sdata->vif.bss_conf.enable_beacon = false; 902 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 903 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); 904 bcn = rcu_dereference_protected(ifmsh->beacon, 905 lockdep_is_held(&sdata->wdev.mtx)); 906 RCU_INIT_POINTER(ifmsh->beacon, NULL); 907 kfree_rcu(bcn, rcu_head); 908 909 /* flush STAs and mpaths on this iface */ 910 sta_info_flush(sdata); 911 mesh_path_flush_by_iface(sdata); 912 913 /* free all potentially still buffered group-addressed frames */ 914 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf); 915 skb_queue_purge(&ifmsh->ps.bc_buf); 916 917 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 918 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 919 del_timer_sync(&sdata->u.mesh.mesh_path_timer); 920 921 /* clear any mesh work (for next join) we may have accrued */ 922 ifmsh->wrkq_flags = 0; 923 ifmsh->mbss_changed = 0; 924 925 local->fif_other_bss--; 926 atomic_dec(&local->iff_allmultis); 927 ieee80211_configure_filter(local); 928 } 929 930 static bool 931 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata, 932 struct ieee802_11_elems *elems, bool beacon) 933 { 934 struct cfg80211_csa_settings params; 935 struct ieee80211_csa_ie csa_ie; 936 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 937 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 938 int err; 939 u32 sta_flags; 940 941 sdata_assert_lock(sdata); 942 943 sta_flags = IEEE80211_STA_DISABLE_VHT; 944 switch (sdata->vif.bss_conf.chandef.width) { 945 case NL80211_CHAN_WIDTH_20_NOHT: 946 sta_flags |= IEEE80211_STA_DISABLE_HT; 947 case NL80211_CHAN_WIDTH_20: 948 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 949 break; 950 default: 951 break; 952 } 953 954 memset(¶ms, 0, sizeof(params)); 955 memset(&csa_ie, 0, sizeof(csa_ie)); 956 err = ieee80211_parse_ch_switch_ie(sdata, elems, band, 957 sta_flags, sdata->vif.addr, 958 &csa_ie); 959 if (err < 0) 960 return false; 961 if (err) 962 return false; 963 964 params.chandef = csa_ie.chandef; 965 params.count = csa_ie.count; 966 967 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, 968 IEEE80211_CHAN_DISABLED)) { 969 sdata_info(sdata, 970 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 971 sdata->vif.addr, 972 params.chandef.chan->center_freq, 973 params.chandef.width, 974 params.chandef.center_freq1, 975 params.chandef.center_freq2); 976 return false; 977 } 978 979 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 980 ¶ms.chandef, 981 NL80211_IFTYPE_MESH_POINT); 982 if (err < 0) 983 return false; 984 if (err > 0) 985 /* TODO: DFS not (yet) supported */ 986 return false; 987 988 params.radar_required = err; 989 990 if (cfg80211_chandef_identical(¶ms.chandef, 991 &sdata->vif.bss_conf.chandef)) { 992 mcsa_dbg(sdata, 993 "received csa with an identical chandef, ignoring\n"); 994 return true; 995 } 996 997 mcsa_dbg(sdata, 998 "received channel switch announcement to go to channel %d MHz\n", 999 params.chandef.chan->center_freq); 1000 1001 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT; 1002 if (beacon) { 1003 ifmsh->chsw_ttl = csa_ie.ttl - 1; 1004 if (ifmsh->pre_value >= csa_ie.pre_value) 1005 return false; 1006 ifmsh->pre_value = csa_ie.pre_value; 1007 } 1008 1009 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) 1010 return false; 1011 1012 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; 1013 1014 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 1015 ¶ms) < 0) 1016 return false; 1017 1018 return true; 1019 } 1020 1021 static void 1022 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, 1023 struct ieee80211_mgmt *mgmt, size_t len) 1024 { 1025 struct ieee80211_local *local = sdata->local; 1026 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1027 struct sk_buff *presp; 1028 struct beacon_data *bcn; 1029 struct ieee80211_mgmt *hdr; 1030 struct ieee802_11_elems elems; 1031 size_t baselen; 1032 u8 *pos; 1033 1034 pos = mgmt->u.probe_req.variable; 1035 baselen = (u8 *) pos - (u8 *) mgmt; 1036 if (baselen > len) 1037 return; 1038 1039 ieee802_11_parse_elems(pos, len - baselen, false, &elems); 1040 1041 if (!elems.mesh_id) 1042 return; 1043 1044 /* 802.11-2012 10.1.4.3.2 */ 1045 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && 1046 !is_broadcast_ether_addr(mgmt->da)) || 1047 elems.ssid_len != 0) 1048 return; 1049 1050 if (elems.mesh_id_len != 0 && 1051 (elems.mesh_id_len != ifmsh->mesh_id_len || 1052 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) 1053 return; 1054 1055 rcu_read_lock(); 1056 bcn = rcu_dereference(ifmsh->beacon); 1057 1058 if (!bcn) 1059 goto out; 1060 1061 presp = dev_alloc_skb(local->tx_headroom + 1062 bcn->head_len + bcn->tail_len); 1063 if (!presp) 1064 goto out; 1065 1066 skb_reserve(presp, local->tx_headroom); 1067 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len); 1068 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len); 1069 hdr = (struct ieee80211_mgmt *) presp->data; 1070 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1071 IEEE80211_STYPE_PROBE_RESP); 1072 memcpy(hdr->da, mgmt->sa, ETH_ALEN); 1073 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1074 ieee80211_tx_skb(sdata, presp); 1075 out: 1076 rcu_read_unlock(); 1077 } 1078 1079 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 1080 u16 stype, 1081 struct ieee80211_mgmt *mgmt, 1082 size_t len, 1083 struct ieee80211_rx_status *rx_status) 1084 { 1085 struct ieee80211_local *local = sdata->local; 1086 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1087 struct ieee802_11_elems elems; 1088 struct ieee80211_channel *channel; 1089 size_t baselen; 1090 int freq; 1091 enum nl80211_band band = rx_status->band; 1092 1093 /* ignore ProbeResp to foreign address */ 1094 if (stype == IEEE80211_STYPE_PROBE_RESP && 1095 !ether_addr_equal(mgmt->da, sdata->vif.addr)) 1096 return; 1097 1098 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1099 if (baselen > len) 1100 return; 1101 1102 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1103 false, &elems); 1104 1105 /* ignore non-mesh or secure / unsecure mismatch */ 1106 if ((!elems.mesh_id || !elems.mesh_config) || 1107 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) || 1108 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)) 1109 return; 1110 1111 if (elems.ds_params) 1112 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band); 1113 else 1114 freq = rx_status->freq; 1115 1116 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1117 1118 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1119 return; 1120 1121 if (mesh_matches_local(sdata, &elems)) 1122 mesh_neighbour_update(sdata, mgmt->sa, &elems); 1123 1124 if (ifmsh->sync_ops) 1125 ifmsh->sync_ops->rx_bcn_presp(sdata, 1126 stype, mgmt, &elems, rx_status); 1127 1128 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && 1129 !sdata->vif.csa_active) 1130 ieee80211_mesh_process_chnswitch(sdata, &elems, true); 1131 } 1132 1133 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata) 1134 { 1135 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1136 struct mesh_csa_settings *tmp_csa_settings; 1137 int ret = 0; 1138 int changed = 0; 1139 1140 /* Reset the TTL value and Initiator flag */ 1141 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1142 ifmsh->chsw_ttl = 0; 1143 1144 /* Remove the CSA and MCSP elements from the beacon */ 1145 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1146 RCU_INIT_POINTER(ifmsh->csa, NULL); 1147 if (tmp_csa_settings) 1148 kfree_rcu(tmp_csa_settings, rcu_head); 1149 ret = ieee80211_mesh_rebuild_beacon(sdata); 1150 if (ret) 1151 return -EINVAL; 1152 1153 changed |= BSS_CHANGED_BEACON; 1154 1155 mcsa_dbg(sdata, "complete switching to center freq %d MHz", 1156 sdata->vif.bss_conf.chandef.chan->center_freq); 1157 return changed; 1158 } 1159 1160 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, 1161 struct cfg80211_csa_settings *csa_settings) 1162 { 1163 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1164 struct mesh_csa_settings *tmp_csa_settings; 1165 int ret = 0; 1166 1167 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings), 1168 GFP_ATOMIC); 1169 if (!tmp_csa_settings) 1170 return -ENOMEM; 1171 1172 memcpy(&tmp_csa_settings->settings, csa_settings, 1173 sizeof(struct cfg80211_csa_settings)); 1174 1175 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings); 1176 1177 ret = ieee80211_mesh_rebuild_beacon(sdata); 1178 if (ret) { 1179 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1180 RCU_INIT_POINTER(ifmsh->csa, NULL); 1181 kfree_rcu(tmp_csa_settings, rcu_head); 1182 return ret; 1183 } 1184 1185 return BSS_CHANGED_BEACON; 1186 } 1187 1188 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata, 1189 struct ieee80211_mgmt *mgmt, size_t len) 1190 { 1191 struct ieee80211_mgmt *mgmt_fwd; 1192 struct sk_buff *skb; 1193 struct ieee80211_local *local = sdata->local; 1194 u8 *pos = mgmt->u.action.u.chan_switch.variable; 1195 size_t offset_ttl; 1196 1197 skb = dev_alloc_skb(local->tx_headroom + len); 1198 if (!skb) 1199 return -ENOMEM; 1200 skb_reserve(skb, local->tx_headroom); 1201 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len); 1202 1203 /* offset_ttl is based on whether the secondary channel 1204 * offset is available or not. Subtract 1 from the mesh TTL 1205 * and disable the initiator flag before forwarding. 1206 */ 1207 offset_ttl = (len < 42) ? 7 : 10; 1208 *(pos + offset_ttl) -= 1; 1209 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 1210 1211 memcpy(mgmt_fwd, mgmt, len); 1212 eth_broadcast_addr(mgmt_fwd->da); 1213 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN); 1214 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN); 1215 1216 ieee80211_tx_skb(sdata, skb); 1217 return 0; 1218 } 1219 1220 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata, 1221 struct ieee80211_mgmt *mgmt, size_t len) 1222 { 1223 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1224 struct ieee802_11_elems elems; 1225 u16 pre_value; 1226 bool fwd_csa = true; 1227 size_t baselen; 1228 u8 *pos; 1229 1230 if (mgmt->u.action.u.measurement.action_code != 1231 WLAN_ACTION_SPCT_CHL_SWITCH) 1232 return; 1233 1234 pos = mgmt->u.action.u.chan_switch.variable; 1235 baselen = offsetof(struct ieee80211_mgmt, 1236 u.action.u.chan_switch.variable); 1237 ieee802_11_parse_elems(pos, len - baselen, false, &elems); 1238 1239 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl; 1240 if (!--ifmsh->chsw_ttl) 1241 fwd_csa = false; 1242 1243 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value); 1244 if (ifmsh->pre_value >= pre_value) 1245 return; 1246 1247 ifmsh->pre_value = pre_value; 1248 1249 if (!sdata->vif.csa_active && 1250 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) { 1251 mcsa_dbg(sdata, "Failed to process CSA action frame"); 1252 return; 1253 } 1254 1255 /* forward or re-broadcast the CSA frame */ 1256 if (fwd_csa) { 1257 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0) 1258 mcsa_dbg(sdata, "Failed to forward the CSA frame"); 1259 } 1260 } 1261 1262 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 1263 struct ieee80211_mgmt *mgmt, 1264 size_t len, 1265 struct ieee80211_rx_status *rx_status) 1266 { 1267 switch (mgmt->u.action.category) { 1268 case WLAN_CATEGORY_SELF_PROTECTED: 1269 switch (mgmt->u.action.u.self_prot.action_code) { 1270 case WLAN_SP_MESH_PEERING_OPEN: 1271 case WLAN_SP_MESH_PEERING_CLOSE: 1272 case WLAN_SP_MESH_PEERING_CONFIRM: 1273 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 1274 break; 1275 } 1276 break; 1277 case WLAN_CATEGORY_MESH_ACTION: 1278 if (mesh_action_is_path_sel(mgmt)) 1279 mesh_rx_path_sel_frame(sdata, mgmt, len); 1280 break; 1281 case WLAN_CATEGORY_SPECTRUM_MGMT: 1282 mesh_rx_csa_frame(sdata, mgmt, len); 1283 break; 1284 } 1285 } 1286 1287 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1288 struct sk_buff *skb) 1289 { 1290 struct ieee80211_rx_status *rx_status; 1291 struct ieee80211_mgmt *mgmt; 1292 u16 stype; 1293 1294 sdata_lock(sdata); 1295 1296 /* mesh already went down */ 1297 if (!sdata->u.mesh.mesh_id_len) 1298 goto out; 1299 1300 rx_status = IEEE80211_SKB_RXCB(skb); 1301 mgmt = (struct ieee80211_mgmt *) skb->data; 1302 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 1303 1304 switch (stype) { 1305 case IEEE80211_STYPE_PROBE_RESP: 1306 case IEEE80211_STYPE_BEACON: 1307 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 1308 rx_status); 1309 break; 1310 case IEEE80211_STYPE_PROBE_REQ: 1311 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); 1312 break; 1313 case IEEE80211_STYPE_ACTION: 1314 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 1315 break; 1316 } 1317 out: 1318 sdata_unlock(sdata); 1319 } 1320 1321 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) 1322 { 1323 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1324 u32 bit, changed = 0; 1325 1326 for_each_set_bit(bit, &ifmsh->mbss_changed, 1327 sizeof(changed) * BITS_PER_BYTE) { 1328 clear_bit(bit, &ifmsh->mbss_changed); 1329 changed |= BIT(bit); 1330 } 1331 1332 if (sdata->vif.bss_conf.enable_beacon && 1333 (changed & (BSS_CHANGED_BEACON | 1334 BSS_CHANGED_HT | 1335 BSS_CHANGED_BASIC_RATES | 1336 BSS_CHANGED_BEACON_INT))) 1337 if (ieee80211_mesh_rebuild_beacon(sdata)) 1338 return; 1339 1340 ieee80211_bss_info_change_notify(sdata, changed); 1341 } 1342 1343 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 1344 { 1345 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1346 1347 sdata_lock(sdata); 1348 1349 /* mesh already went down */ 1350 if (!sdata->u.mesh.mesh_id_len) 1351 goto out; 1352 1353 if (ifmsh->preq_queue_len && 1354 time_after(jiffies, 1355 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 1356 mesh_path_start_discovery(sdata); 1357 1358 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 1359 ieee80211_mesh_housekeeping(sdata); 1360 1361 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 1362 ieee80211_mesh_rootpath(sdata); 1363 1364 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags)) 1365 mesh_sync_adjust_tbtt(sdata); 1366 1367 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) 1368 mesh_bss_info_changed(sdata); 1369 out: 1370 sdata_unlock(sdata); 1371 } 1372 1373 1374 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 1375 { 1376 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1377 static u8 zero_addr[ETH_ALEN] = {}; 1378 1379 setup_timer(&ifmsh->housekeeping_timer, 1380 ieee80211_mesh_housekeeping_timer, 1381 (unsigned long) sdata); 1382 1383 ifmsh->accepting_plinks = true; 1384 atomic_set(&ifmsh->mpaths, 0); 1385 mesh_rmc_init(sdata); 1386 ifmsh->last_preq = jiffies; 1387 ifmsh->next_perr = jiffies; 1388 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1389 /* Allocate all mesh structures when creating the first mesh interface. */ 1390 if (!mesh_allocated) 1391 ieee80211s_init(); 1392 1393 mesh_pathtbl_init(sdata); 1394 1395 setup_timer(&ifmsh->mesh_path_timer, 1396 ieee80211_mesh_path_timer, 1397 (unsigned long) sdata); 1398 setup_timer(&ifmsh->mesh_path_root_timer, 1399 ieee80211_mesh_path_root_timer, 1400 (unsigned long) sdata); 1401 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 1402 skb_queue_head_init(&ifmsh->ps.bc_buf); 1403 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 1404 spin_lock_init(&ifmsh->sync_offset_lock); 1405 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1406 1407 sdata->vif.bss_conf.bssid = zero_addr; 1408 } 1409 1410 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1411 { 1412 mesh_rmc_free(sdata); 1413 mesh_pathtbl_unregister(sdata); 1414 } 1415