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 = 0; 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 if (sdata->u.mesh.user_mpm && 159 sta->mesh->plink_state == NL80211_PLINK_ESTAB) 160 changed |= mesh_plink_dec_estab_count(sdata); 161 changed |= mesh_accept_plinks_update(sdata); 162 if (!sdata->u.mesh.user_mpm) { 163 changed |= mesh_plink_deactivate(sta); 164 del_timer_sync(&sta->mesh->plink_timer); 165 } 166 167 /* make sure no readers can access nexthop sta from here on */ 168 mesh_path_flush_by_nexthop(sta); 169 synchronize_net(); 170 171 if (changed) 172 ieee80211_mbss_info_change_notify(sdata, changed); 173 } 174 175 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) 176 { 177 int i; 178 179 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); 180 if (!sdata->u.mesh.rmc) 181 return -ENOMEM; 182 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; 183 for (i = 0; i < RMC_BUCKETS; i++) 184 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]); 185 return 0; 186 } 187 188 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) 189 { 190 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 191 struct rmc_entry *p; 192 struct hlist_node *n; 193 int i; 194 195 if (!sdata->u.mesh.rmc) 196 return; 197 198 for (i = 0; i < RMC_BUCKETS; i++) { 199 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) { 200 hlist_del(&p->list); 201 kmem_cache_free(rm_cache, p); 202 } 203 } 204 205 kfree(rmc); 206 sdata->u.mesh.rmc = NULL; 207 } 208 209 /** 210 * mesh_rmc_check - Check frame in recent multicast cache and add if absent. 211 * 212 * @sdata: interface 213 * @sa: source address 214 * @mesh_hdr: mesh_header 215 * 216 * Returns: 0 if the frame is not in the cache, nonzero otherwise. 217 * 218 * Checks using the source address and the mesh sequence number if we have 219 * received this frame lately. If the frame is not in the cache, it is added to 220 * it. 221 */ 222 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 223 const u8 *sa, struct ieee80211s_hdr *mesh_hdr) 224 { 225 struct mesh_rmc *rmc = sdata->u.mesh.rmc; 226 u32 seqnum = 0; 227 int entries = 0; 228 u8 idx; 229 struct rmc_entry *p; 230 struct hlist_node *n; 231 232 if (!rmc) 233 return -1; 234 235 /* Don't care about endianness since only match matters */ 236 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); 237 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; 238 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) { 239 ++entries; 240 if (time_after(jiffies, p->exp_time) || 241 entries == RMC_QUEUE_MAX_LEN) { 242 hlist_del(&p->list); 243 kmem_cache_free(rm_cache, p); 244 --entries; 245 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa)) 246 return -1; 247 } 248 249 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); 250 if (!p) 251 return 0; 252 253 p->seqnum = seqnum; 254 p->exp_time = jiffies + RMC_TIMEOUT; 255 memcpy(p->sa, sa, ETH_ALEN); 256 hlist_add_head(&p->list, &rmc->bucket[idx]); 257 return 0; 258 } 259 260 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 261 struct sk_buff *skb) 262 { 263 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 264 u8 *pos, neighbors; 265 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie); 266 267 if (skb_tailroom(skb) < 2 + meshconf_len) 268 return -ENOMEM; 269 270 pos = skb_put(skb, 2 + meshconf_len); 271 *pos++ = WLAN_EID_MESH_CONFIG; 272 *pos++ = meshconf_len; 273 274 /* save a pointer for quick updates in pre-tbtt */ 275 ifmsh->meshconf_offset = pos - skb->data; 276 277 /* Active path selection protocol ID */ 278 *pos++ = ifmsh->mesh_pp_id; 279 /* Active path selection metric ID */ 280 *pos++ = ifmsh->mesh_pm_id; 281 /* Congestion control mode identifier */ 282 *pos++ = ifmsh->mesh_cc_id; 283 /* Synchronization protocol identifier */ 284 *pos++ = ifmsh->mesh_sp_id; 285 /* Authentication Protocol identifier */ 286 *pos++ = ifmsh->mesh_auth_id; 287 /* Mesh Formation Info - number of neighbors */ 288 neighbors = atomic_read(&ifmsh->estab_plinks); 289 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS); 290 *pos++ = neighbors << 1; 291 /* Mesh capability */ 292 *pos = 0x00; 293 *pos |= ifmsh->mshcfg.dot11MeshForwarding ? 294 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00; 295 *pos |= ifmsh->accepting_plinks ? 296 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; 297 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */ 298 *pos |= ifmsh->ps_peers_deep_sleep ? 299 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00; 300 *pos++ |= ifmsh->adjusting_tbtt ? 301 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00; 302 *pos++ = 0x00; 303 304 return 0; 305 } 306 307 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 308 { 309 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 310 u8 *pos; 311 312 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len) 313 return -ENOMEM; 314 315 pos = skb_put(skb, 2 + ifmsh->mesh_id_len); 316 *pos++ = WLAN_EID_MESH_ID; 317 *pos++ = ifmsh->mesh_id_len; 318 if (ifmsh->mesh_id_len) 319 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len); 320 321 return 0; 322 } 323 324 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata, 325 struct sk_buff *skb) 326 { 327 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 328 u8 *pos; 329 330 /* see IEEE802.11-2012 13.14.6 */ 331 if (ifmsh->ps_peers_light_sleep == 0 && 332 ifmsh->ps_peers_deep_sleep == 0 && 333 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE) 334 return 0; 335 336 if (skb_tailroom(skb) < 4) 337 return -ENOMEM; 338 339 pos = skb_put(skb, 2 + 2); 340 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW; 341 *pos++ = 2; 342 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos); 343 344 return 0; 345 } 346 347 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 348 struct sk_buff *skb) 349 { 350 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 351 u8 offset, len; 352 const u8 *data; 353 354 if (!ifmsh->ie || !ifmsh->ie_len) 355 return 0; 356 357 /* fast-forward to vendor IEs */ 358 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0); 359 360 if (offset) { 361 len = ifmsh->ie_len - offset; 362 data = ifmsh->ie + offset; 363 if (skb_tailroom(skb) < len) 364 return -ENOMEM; 365 memcpy(skb_put(skb, len), data, len); 366 } 367 368 return 0; 369 } 370 371 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 372 { 373 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 374 u8 len = 0; 375 const u8 *data; 376 377 if (!ifmsh->ie || !ifmsh->ie_len) 378 return 0; 379 380 /* find RSN IE */ 381 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len); 382 if (!data) 383 return 0; 384 385 len = data[1] + 2; 386 387 if (skb_tailroom(skb) < len) 388 return -ENOMEM; 389 memcpy(skb_put(skb, len), data, len); 390 391 return 0; 392 } 393 394 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata, 395 struct sk_buff *skb) 396 { 397 struct ieee80211_chanctx_conf *chanctx_conf; 398 struct ieee80211_channel *chan; 399 u8 *pos; 400 401 if (skb_tailroom(skb) < 3) 402 return -ENOMEM; 403 404 rcu_read_lock(); 405 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 406 if (WARN_ON(!chanctx_conf)) { 407 rcu_read_unlock(); 408 return -EINVAL; 409 } 410 chan = chanctx_conf->def.chan; 411 rcu_read_unlock(); 412 413 pos = skb_put(skb, 2 + 1); 414 *pos++ = WLAN_EID_DS_PARAMS; 415 *pos++ = 1; 416 *pos++ = ieee80211_frequency_to_channel(chan->center_freq); 417 418 return 0; 419 } 420 421 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 422 struct sk_buff *skb) 423 { 424 struct ieee80211_local *local = sdata->local; 425 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 426 struct ieee80211_supported_band *sband; 427 u8 *pos; 428 429 sband = local->hw.wiphy->bands[band]; 430 if (!sband->ht_cap.ht_supported || 431 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 432 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 433 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 434 return 0; 435 436 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap)) 437 return -ENOMEM; 438 439 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap)); 440 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap); 441 442 return 0; 443 } 444 445 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 446 struct sk_buff *skb) 447 { 448 struct ieee80211_local *local = sdata->local; 449 struct ieee80211_chanctx_conf *chanctx_conf; 450 struct ieee80211_channel *channel; 451 struct ieee80211_supported_band *sband; 452 struct ieee80211_sta_ht_cap *ht_cap; 453 u8 *pos; 454 455 rcu_read_lock(); 456 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 457 if (WARN_ON(!chanctx_conf)) { 458 rcu_read_unlock(); 459 return -EINVAL; 460 } 461 channel = chanctx_conf->def.chan; 462 rcu_read_unlock(); 463 464 sband = local->hw.wiphy->bands[channel->band]; 465 ht_cap = &sband->ht_cap; 466 467 if (!ht_cap->ht_supported || 468 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 469 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 470 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 471 return 0; 472 473 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation)) 474 return -ENOMEM; 475 476 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); 477 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef, 478 sdata->vif.bss_conf.ht_operation_mode, 479 false); 480 481 return 0; 482 } 483 484 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, 485 struct sk_buff *skb) 486 { 487 struct ieee80211_local *local = sdata->local; 488 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 489 struct ieee80211_supported_band *sband; 490 u8 *pos; 491 492 sband = local->hw.wiphy->bands[band]; 493 if (!sband->vht_cap.vht_supported || 494 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 495 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 496 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 497 return 0; 498 499 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap)) 500 return -ENOMEM; 501 502 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap)); 503 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap); 504 505 return 0; 506 } 507 508 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, 509 struct sk_buff *skb) 510 { 511 struct ieee80211_local *local = sdata->local; 512 struct ieee80211_chanctx_conf *chanctx_conf; 513 struct ieee80211_channel *channel; 514 struct ieee80211_supported_band *sband; 515 struct ieee80211_sta_vht_cap *vht_cap; 516 u8 *pos; 517 518 rcu_read_lock(); 519 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 520 if (WARN_ON(!chanctx_conf)) { 521 rcu_read_unlock(); 522 return -EINVAL; 523 } 524 channel = chanctx_conf->def.chan; 525 rcu_read_unlock(); 526 527 sband = local->hw.wiphy->bands[channel->band]; 528 vht_cap = &sband->vht_cap; 529 530 if (!vht_cap->vht_supported || 531 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 532 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 || 533 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10) 534 return 0; 535 536 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation)) 537 return -ENOMEM; 538 539 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); 540 ieee80211_ie_build_vht_oper(pos, vht_cap, 541 &sdata->vif.bss_conf.chandef); 542 543 return 0; 544 } 545 546 static void ieee80211_mesh_path_timer(unsigned long data) 547 { 548 struct ieee80211_sub_if_data *sdata = 549 (struct ieee80211_sub_if_data *) data; 550 551 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 552 } 553 554 static void ieee80211_mesh_path_root_timer(unsigned long data) 555 { 556 struct ieee80211_sub_if_data *sdata = 557 (struct ieee80211_sub_if_data *) data; 558 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 559 560 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 561 562 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 563 } 564 565 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh) 566 { 567 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT) 568 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 569 else { 570 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); 571 /* stop running timer */ 572 del_timer_sync(&ifmsh->mesh_path_root_timer); 573 } 574 } 575 576 /** 577 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame 578 * @hdr: 802.11 frame header 579 * @fc: frame control field 580 * @meshda: destination address in the mesh 581 * @meshsa: source address address in the mesh. Same as TA, as frame is 582 * locally originated. 583 * 584 * Return the length of the 802.11 (does not include a mesh control header) 585 */ 586 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 587 const u8 *meshda, const u8 *meshsa) 588 { 589 if (is_multicast_ether_addr(meshda)) { 590 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 591 /* DA TA SA */ 592 memcpy(hdr->addr1, meshda, ETH_ALEN); 593 memcpy(hdr->addr2, meshsa, ETH_ALEN); 594 memcpy(hdr->addr3, meshsa, ETH_ALEN); 595 return 24; 596 } else { 597 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 598 /* RA TA DA SA */ 599 eth_zero_addr(hdr->addr1); /* RA is resolved later */ 600 memcpy(hdr->addr2, meshsa, ETH_ALEN); 601 memcpy(hdr->addr3, meshda, ETH_ALEN); 602 memcpy(hdr->addr4, meshsa, ETH_ALEN); 603 return 30; 604 } 605 } 606 607 /** 608 * ieee80211_new_mesh_header - create a new mesh header 609 * @sdata: mesh interface to be used 610 * @meshhdr: uninitialized mesh header 611 * @addr4or5: 1st address in the ae header, which may correspond to address 4 612 * (if addr6 is NULL) or address 5 (if addr6 is present). It may 613 * be NULL. 614 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the 615 * mesh frame 616 * 617 * Return the header length. 618 */ 619 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 620 struct ieee80211s_hdr *meshhdr, 621 const char *addr4or5, const char *addr6) 622 { 623 if (WARN_ON(!addr4or5 && addr6)) 624 return 0; 625 626 memset(meshhdr, 0, sizeof(*meshhdr)); 627 628 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; 629 630 /* FIXME: racy -- TX on multiple queues can be concurrent */ 631 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); 632 sdata->u.mesh.mesh_seqnum++; 633 634 if (addr4or5 && !addr6) { 635 meshhdr->flags |= MESH_FLAGS_AE_A4; 636 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 637 return 2 * ETH_ALEN; 638 } else if (addr4or5 && addr6) { 639 meshhdr->flags |= MESH_FLAGS_AE_A5_A6; 640 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN); 641 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); 642 return 3 * ETH_ALEN; 643 } 644 645 return ETH_ALEN; 646 } 647 648 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata) 649 { 650 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 651 u32 changed; 652 653 if (ifmsh->mshcfg.plink_timeout > 0) 654 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ); 655 mesh_path_expire(sdata); 656 657 changed = mesh_accept_plinks_update(sdata); 658 ieee80211_mbss_info_change_notify(sdata, changed); 659 660 mod_timer(&ifmsh->housekeeping_timer, 661 round_jiffies(jiffies + 662 IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); 663 } 664 665 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) 666 { 667 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 668 u32 interval; 669 670 mesh_path_tx_root_frame(sdata); 671 672 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN) 673 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; 674 else 675 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval; 676 677 mod_timer(&ifmsh->mesh_path_root_timer, 678 round_jiffies(TU_TO_EXP_TIME(interval))); 679 } 680 681 static int 682 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh) 683 { 684 struct beacon_data *bcn; 685 int head_len, tail_len; 686 struct sk_buff *skb; 687 struct ieee80211_mgmt *mgmt; 688 struct ieee80211_chanctx_conf *chanctx_conf; 689 struct mesh_csa_settings *csa; 690 enum nl80211_band band; 691 u8 *pos; 692 struct ieee80211_sub_if_data *sdata; 693 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 694 sizeof(mgmt->u.beacon); 695 696 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh); 697 rcu_read_lock(); 698 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 699 band = chanctx_conf->def.chan->band; 700 rcu_read_unlock(); 701 702 head_len = hdr_len + 703 2 + /* NULL SSID */ 704 /* Channel Switch Announcement */ 705 2 + sizeof(struct ieee80211_channel_sw_ie) + 706 /* Mesh Channel Swith Parameters */ 707 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) + 708 2 + 8 + /* supported rates */ 709 2 + 3; /* DS params */ 710 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 711 2 + sizeof(struct ieee80211_ht_cap) + 712 2 + sizeof(struct ieee80211_ht_operation) + 713 2 + ifmsh->mesh_id_len + 714 2 + sizeof(struct ieee80211_meshconf_ie) + 715 2 + sizeof(__le16) + /* awake window */ 716 2 + sizeof(struct ieee80211_vht_cap) + 717 2 + sizeof(struct ieee80211_vht_operation) + 718 ifmsh->ie_len; 719 720 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL); 721 /* need an skb for IE builders to operate on */ 722 skb = dev_alloc_skb(max(head_len, tail_len)); 723 724 if (!bcn || !skb) 725 goto out_free; 726 727 /* 728 * pointers go into the block we allocated, 729 * memory is | beacon_data | head | tail | 730 */ 731 bcn->head = ((u8 *) bcn) + sizeof(*bcn); 732 733 /* fill in the head */ 734 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 735 memset(mgmt, 0, hdr_len); 736 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 737 IEEE80211_STYPE_BEACON); 738 eth_broadcast_addr(mgmt->da); 739 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 740 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 741 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt); 742 mgmt->u.beacon.beacon_int = 743 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 744 mgmt->u.beacon.capab_info |= cpu_to_le16( 745 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 746 747 pos = skb_put(skb, 2); 748 *pos++ = WLAN_EID_SSID; 749 *pos++ = 0x0; 750 751 rcu_read_lock(); 752 csa = rcu_dereference(ifmsh->csa); 753 if (csa) { 754 pos = skb_put(skb, 13); 755 memset(pos, 0, 13); 756 *pos++ = WLAN_EID_CHANNEL_SWITCH; 757 *pos++ = 3; 758 *pos++ = 0x0; 759 *pos++ = ieee80211_frequency_to_channel( 760 csa->settings.chandef.chan->center_freq); 761 bcn->csa_current_counter = csa->settings.count; 762 bcn->csa_counter_offsets[0] = hdr_len + 6; 763 *pos++ = csa->settings.count; 764 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; 765 *pos++ = 6; 766 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) { 767 *pos++ = ifmsh->mshcfg.dot11MeshTTL; 768 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 769 } else { 770 *pos++ = ifmsh->chsw_ttl; 771 } 772 *pos++ |= csa->settings.block_tx ? 773 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00; 774 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); 775 pos += 2; 776 put_unaligned_le16(ifmsh->pre_value, pos); 777 pos += 2; 778 } 779 rcu_read_unlock(); 780 781 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 782 mesh_add_ds_params_ie(sdata, skb)) 783 goto out_free; 784 785 bcn->head_len = skb->len; 786 memcpy(bcn->head, skb->data, bcn->head_len); 787 788 /* now the tail */ 789 skb_trim(skb, 0); 790 bcn->tail = bcn->head + bcn->head_len; 791 792 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 793 mesh_add_rsn_ie(sdata, skb) || 794 mesh_add_ht_cap_ie(sdata, skb) || 795 mesh_add_ht_oper_ie(sdata, skb) || 796 mesh_add_meshid_ie(sdata, skb) || 797 mesh_add_meshconf_ie(sdata, skb) || 798 mesh_add_awake_window_ie(sdata, skb) || 799 mesh_add_vht_cap_ie(sdata, skb) || 800 mesh_add_vht_oper_ie(sdata, skb) || 801 mesh_add_vendor_ies(sdata, skb)) 802 goto out_free; 803 804 bcn->tail_len = skb->len; 805 memcpy(bcn->tail, skb->data, bcn->tail_len); 806 bcn->meshconf = (struct ieee80211_meshconf_ie *) 807 (bcn->tail + ifmsh->meshconf_offset); 808 809 dev_kfree_skb(skb); 810 rcu_assign_pointer(ifmsh->beacon, bcn); 811 return 0; 812 out_free: 813 kfree(bcn); 814 dev_kfree_skb(skb); 815 return -ENOMEM; 816 } 817 818 static int 819 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata) 820 { 821 struct beacon_data *old_bcn; 822 int ret; 823 824 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon, 825 lockdep_is_held(&sdata->wdev.mtx)); 826 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh); 827 if (ret) 828 /* just reuse old beacon */ 829 return ret; 830 831 if (old_bcn) 832 kfree_rcu(old_bcn, rcu_head); 833 return 0; 834 } 835 836 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 837 u32 changed) 838 { 839 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 840 unsigned long bits = changed; 841 u32 bit; 842 843 if (!bits) 844 return; 845 846 /* if we race with running work, worst case this work becomes a noop */ 847 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE) 848 set_bit(bit, &ifmsh->mbss_changed); 849 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags); 850 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 851 } 852 853 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) 854 { 855 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 856 struct ieee80211_local *local = sdata->local; 857 u32 changed = BSS_CHANGED_BEACON | 858 BSS_CHANGED_BEACON_ENABLED | 859 BSS_CHANGED_HT | 860 BSS_CHANGED_BASIC_RATES | 861 BSS_CHANGED_BEACON_INT; 862 863 local->fif_other_bss++; 864 /* mesh ifaces must set allmulti to forward mcast traffic */ 865 atomic_inc(&local->iff_allmultis); 866 ieee80211_configure_filter(local); 867 868 ifmsh->mesh_cc_id = 0; /* Disabled */ 869 /* register sync ops from extensible synchronization framework */ 870 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id); 871 ifmsh->adjusting_tbtt = false; 872 ifmsh->sync_offset_clockdrift_max = 0; 873 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); 874 ieee80211_mesh_root_setup(ifmsh); 875 ieee80211_queue_work(&local->hw, &sdata->work); 876 sdata->vif.bss_conf.ht_operation_mode = 877 ifmsh->mshcfg.ht_opmode; 878 sdata->vif.bss_conf.enable_beacon = true; 879 880 changed |= ieee80211_mps_local_status_update(sdata); 881 882 if (ieee80211_mesh_build_beacon(ifmsh)) { 883 ieee80211_stop_mesh(sdata); 884 return -ENOMEM; 885 } 886 887 ieee80211_recalc_dtim(local, sdata); 888 ieee80211_bss_info_change_notify(sdata, changed); 889 890 netif_carrier_on(sdata->dev); 891 return 0; 892 } 893 894 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 895 { 896 struct ieee80211_local *local = sdata->local; 897 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 898 struct beacon_data *bcn; 899 900 netif_carrier_off(sdata->dev); 901 902 /* stop the beacon */ 903 ifmsh->mesh_id_len = 0; 904 sdata->vif.bss_conf.enable_beacon = false; 905 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 906 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); 907 bcn = rcu_dereference_protected(ifmsh->beacon, 908 lockdep_is_held(&sdata->wdev.mtx)); 909 RCU_INIT_POINTER(ifmsh->beacon, NULL); 910 kfree_rcu(bcn, rcu_head); 911 912 /* flush STAs and mpaths on this iface */ 913 sta_info_flush(sdata); 914 mesh_path_flush_by_iface(sdata); 915 916 /* free all potentially still buffered group-addressed frames */ 917 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf); 918 skb_queue_purge(&ifmsh->ps.bc_buf); 919 920 del_timer_sync(&sdata->u.mesh.housekeeping_timer); 921 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); 922 del_timer_sync(&sdata->u.mesh.mesh_path_timer); 923 924 /* clear any mesh work (for next join) we may have accrued */ 925 ifmsh->wrkq_flags = 0; 926 ifmsh->mbss_changed = 0; 927 928 local->fif_other_bss--; 929 atomic_dec(&local->iff_allmultis); 930 ieee80211_configure_filter(local); 931 } 932 933 static bool 934 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata, 935 struct ieee802_11_elems *elems, bool beacon) 936 { 937 struct cfg80211_csa_settings params; 938 struct ieee80211_csa_ie csa_ie; 939 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 940 enum nl80211_band band = ieee80211_get_sdata_band(sdata); 941 int err; 942 u32 sta_flags; 943 944 sdata_assert_lock(sdata); 945 946 sta_flags = IEEE80211_STA_DISABLE_VHT; 947 switch (sdata->vif.bss_conf.chandef.width) { 948 case NL80211_CHAN_WIDTH_20_NOHT: 949 sta_flags |= IEEE80211_STA_DISABLE_HT; 950 case NL80211_CHAN_WIDTH_20: 951 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 952 break; 953 default: 954 break; 955 } 956 957 memset(¶ms, 0, sizeof(params)); 958 memset(&csa_ie, 0, sizeof(csa_ie)); 959 err = ieee80211_parse_ch_switch_ie(sdata, elems, band, 960 sta_flags, sdata->vif.addr, 961 &csa_ie); 962 if (err < 0) 963 return false; 964 if (err) 965 return false; 966 967 params.chandef = csa_ie.chandef; 968 params.count = csa_ie.count; 969 970 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef, 971 IEEE80211_CHAN_DISABLED)) { 972 sdata_info(sdata, 973 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n", 974 sdata->vif.addr, 975 params.chandef.chan->center_freq, 976 params.chandef.width, 977 params.chandef.center_freq1, 978 params.chandef.center_freq2); 979 return false; 980 } 981 982 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 983 ¶ms.chandef, 984 NL80211_IFTYPE_MESH_POINT); 985 if (err < 0) 986 return false; 987 if (err > 0) 988 /* TODO: DFS not (yet) supported */ 989 return false; 990 991 params.radar_required = err; 992 993 if (cfg80211_chandef_identical(¶ms.chandef, 994 &sdata->vif.bss_conf.chandef)) { 995 mcsa_dbg(sdata, 996 "received csa with an identical chandef, ignoring\n"); 997 return true; 998 } 999 1000 mcsa_dbg(sdata, 1001 "received channel switch announcement to go to channel %d MHz\n", 1002 params.chandef.chan->center_freq); 1003 1004 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT; 1005 if (beacon) { 1006 ifmsh->chsw_ttl = csa_ie.ttl - 1; 1007 if (ifmsh->pre_value >= csa_ie.pre_value) 1008 return false; 1009 ifmsh->pre_value = csa_ie.pre_value; 1010 } 1011 1012 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL) 1013 return false; 1014 1015 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER; 1016 1017 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 1018 ¶ms) < 0) 1019 return false; 1020 1021 return true; 1022 } 1023 1024 static void 1025 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, 1026 struct ieee80211_mgmt *mgmt, size_t len) 1027 { 1028 struct ieee80211_local *local = sdata->local; 1029 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1030 struct sk_buff *presp; 1031 struct beacon_data *bcn; 1032 struct ieee80211_mgmt *hdr; 1033 struct ieee802_11_elems elems; 1034 size_t baselen; 1035 u8 *pos; 1036 1037 pos = mgmt->u.probe_req.variable; 1038 baselen = (u8 *) pos - (u8 *) mgmt; 1039 if (baselen > len) 1040 return; 1041 1042 ieee802_11_parse_elems(pos, len - baselen, false, &elems); 1043 1044 if (!elems.mesh_id) 1045 return; 1046 1047 /* 802.11-2012 10.1.4.3.2 */ 1048 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && 1049 !is_broadcast_ether_addr(mgmt->da)) || 1050 elems.ssid_len != 0) 1051 return; 1052 1053 if (elems.mesh_id_len != 0 && 1054 (elems.mesh_id_len != ifmsh->mesh_id_len || 1055 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) 1056 return; 1057 1058 rcu_read_lock(); 1059 bcn = rcu_dereference(ifmsh->beacon); 1060 1061 if (!bcn) 1062 goto out; 1063 1064 presp = dev_alloc_skb(local->tx_headroom + 1065 bcn->head_len + bcn->tail_len); 1066 if (!presp) 1067 goto out; 1068 1069 skb_reserve(presp, local->tx_headroom); 1070 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len); 1071 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len); 1072 hdr = (struct ieee80211_mgmt *) presp->data; 1073 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1074 IEEE80211_STYPE_PROBE_RESP); 1075 memcpy(hdr->da, mgmt->sa, ETH_ALEN); 1076 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1077 ieee80211_tx_skb(sdata, presp); 1078 out: 1079 rcu_read_unlock(); 1080 } 1081 1082 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, 1083 u16 stype, 1084 struct ieee80211_mgmt *mgmt, 1085 size_t len, 1086 struct ieee80211_rx_status *rx_status) 1087 { 1088 struct ieee80211_local *local = sdata->local; 1089 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1090 struct ieee802_11_elems elems; 1091 struct ieee80211_channel *channel; 1092 size_t baselen; 1093 int freq; 1094 enum nl80211_band band = rx_status->band; 1095 1096 /* ignore ProbeResp to foreign address */ 1097 if (stype == IEEE80211_STYPE_PROBE_RESP && 1098 !ether_addr_equal(mgmt->da, sdata->vif.addr)) 1099 return; 1100 1101 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1102 if (baselen > len) 1103 return; 1104 1105 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1106 false, &elems); 1107 1108 /* ignore non-mesh or secure / unsecure mismatch */ 1109 if ((!elems.mesh_id || !elems.mesh_config) || 1110 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) || 1111 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)) 1112 return; 1113 1114 if (elems.ds_params) 1115 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band); 1116 else 1117 freq = rx_status->freq; 1118 1119 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1120 1121 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1122 return; 1123 1124 if (mesh_matches_local(sdata, &elems)) 1125 mesh_neighbour_update(sdata, mgmt->sa, &elems); 1126 1127 if (ifmsh->sync_ops) 1128 ifmsh->sync_ops->rx_bcn_presp(sdata, 1129 stype, mgmt, &elems, rx_status); 1130 1131 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT && 1132 !sdata->vif.csa_active) 1133 ieee80211_mesh_process_chnswitch(sdata, &elems, true); 1134 } 1135 1136 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata) 1137 { 1138 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1139 struct mesh_csa_settings *tmp_csa_settings; 1140 int ret = 0; 1141 int changed = 0; 1142 1143 /* Reset the TTL value and Initiator flag */ 1144 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1145 ifmsh->chsw_ttl = 0; 1146 1147 /* Remove the CSA and MCSP elements from the beacon */ 1148 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1149 RCU_INIT_POINTER(ifmsh->csa, NULL); 1150 if (tmp_csa_settings) 1151 kfree_rcu(tmp_csa_settings, rcu_head); 1152 ret = ieee80211_mesh_rebuild_beacon(sdata); 1153 if (ret) 1154 return -EINVAL; 1155 1156 changed |= BSS_CHANGED_BEACON; 1157 1158 mcsa_dbg(sdata, "complete switching to center freq %d MHz", 1159 sdata->vif.bss_conf.chandef.chan->center_freq); 1160 return changed; 1161 } 1162 1163 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata, 1164 struct cfg80211_csa_settings *csa_settings) 1165 { 1166 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1167 struct mesh_csa_settings *tmp_csa_settings; 1168 int ret = 0; 1169 1170 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings), 1171 GFP_ATOMIC); 1172 if (!tmp_csa_settings) 1173 return -ENOMEM; 1174 1175 memcpy(&tmp_csa_settings->settings, csa_settings, 1176 sizeof(struct cfg80211_csa_settings)); 1177 1178 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings); 1179 1180 ret = ieee80211_mesh_rebuild_beacon(sdata); 1181 if (ret) { 1182 tmp_csa_settings = rcu_dereference(ifmsh->csa); 1183 RCU_INIT_POINTER(ifmsh->csa, NULL); 1184 kfree_rcu(tmp_csa_settings, rcu_head); 1185 return ret; 1186 } 1187 1188 return BSS_CHANGED_BEACON; 1189 } 1190 1191 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata, 1192 struct ieee80211_mgmt *mgmt, size_t len) 1193 { 1194 struct ieee80211_mgmt *mgmt_fwd; 1195 struct sk_buff *skb; 1196 struct ieee80211_local *local = sdata->local; 1197 u8 *pos = mgmt->u.action.u.chan_switch.variable; 1198 size_t offset_ttl; 1199 1200 skb = dev_alloc_skb(local->tx_headroom + len); 1201 if (!skb) 1202 return -ENOMEM; 1203 skb_reserve(skb, local->tx_headroom); 1204 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len); 1205 1206 /* offset_ttl is based on whether the secondary channel 1207 * offset is available or not. Subtract 1 from the mesh TTL 1208 * and disable the initiator flag before forwarding. 1209 */ 1210 offset_ttl = (len < 42) ? 7 : 10; 1211 *(pos + offset_ttl) -= 1; 1212 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 1213 1214 memcpy(mgmt_fwd, mgmt, len); 1215 eth_broadcast_addr(mgmt_fwd->da); 1216 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN); 1217 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN); 1218 1219 ieee80211_tx_skb(sdata, skb); 1220 return 0; 1221 } 1222 1223 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata, 1224 struct ieee80211_mgmt *mgmt, size_t len) 1225 { 1226 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1227 struct ieee802_11_elems elems; 1228 u16 pre_value; 1229 bool fwd_csa = true; 1230 size_t baselen; 1231 u8 *pos; 1232 1233 if (mgmt->u.action.u.measurement.action_code != 1234 WLAN_ACTION_SPCT_CHL_SWITCH) 1235 return; 1236 1237 pos = mgmt->u.action.u.chan_switch.variable; 1238 baselen = offsetof(struct ieee80211_mgmt, 1239 u.action.u.chan_switch.variable); 1240 ieee802_11_parse_elems(pos, len - baselen, false, &elems); 1241 1242 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl; 1243 if (!--ifmsh->chsw_ttl) 1244 fwd_csa = false; 1245 1246 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value); 1247 if (ifmsh->pre_value >= pre_value) 1248 return; 1249 1250 ifmsh->pre_value = pre_value; 1251 1252 if (!sdata->vif.csa_active && 1253 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) { 1254 mcsa_dbg(sdata, "Failed to process CSA action frame"); 1255 return; 1256 } 1257 1258 /* forward or re-broadcast the CSA frame */ 1259 if (fwd_csa) { 1260 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0) 1261 mcsa_dbg(sdata, "Failed to forward the CSA frame"); 1262 } 1263 } 1264 1265 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 1266 struct ieee80211_mgmt *mgmt, 1267 size_t len, 1268 struct ieee80211_rx_status *rx_status) 1269 { 1270 switch (mgmt->u.action.category) { 1271 case WLAN_CATEGORY_SELF_PROTECTED: 1272 switch (mgmt->u.action.u.self_prot.action_code) { 1273 case WLAN_SP_MESH_PEERING_OPEN: 1274 case WLAN_SP_MESH_PEERING_CLOSE: 1275 case WLAN_SP_MESH_PEERING_CONFIRM: 1276 mesh_rx_plink_frame(sdata, mgmt, len, rx_status); 1277 break; 1278 } 1279 break; 1280 case WLAN_CATEGORY_MESH_ACTION: 1281 if (mesh_action_is_path_sel(mgmt)) 1282 mesh_rx_path_sel_frame(sdata, mgmt, len); 1283 break; 1284 case WLAN_CATEGORY_SPECTRUM_MGMT: 1285 mesh_rx_csa_frame(sdata, mgmt, len); 1286 break; 1287 } 1288 } 1289 1290 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1291 struct sk_buff *skb) 1292 { 1293 struct ieee80211_rx_status *rx_status; 1294 struct ieee80211_mgmt *mgmt; 1295 u16 stype; 1296 1297 sdata_lock(sdata); 1298 1299 /* mesh already went down */ 1300 if (!sdata->u.mesh.mesh_id_len) 1301 goto out; 1302 1303 rx_status = IEEE80211_SKB_RXCB(skb); 1304 mgmt = (struct ieee80211_mgmt *) skb->data; 1305 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 1306 1307 switch (stype) { 1308 case IEEE80211_STYPE_PROBE_RESP: 1309 case IEEE80211_STYPE_BEACON: 1310 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, 1311 rx_status); 1312 break; 1313 case IEEE80211_STYPE_PROBE_REQ: 1314 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); 1315 break; 1316 case IEEE80211_STYPE_ACTION: 1317 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); 1318 break; 1319 } 1320 out: 1321 sdata_unlock(sdata); 1322 } 1323 1324 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata) 1325 { 1326 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1327 u32 bit, changed = 0; 1328 1329 for_each_set_bit(bit, &ifmsh->mbss_changed, 1330 sizeof(changed) * BITS_PER_BYTE) { 1331 clear_bit(bit, &ifmsh->mbss_changed); 1332 changed |= BIT(bit); 1333 } 1334 1335 if (sdata->vif.bss_conf.enable_beacon && 1336 (changed & (BSS_CHANGED_BEACON | 1337 BSS_CHANGED_HT | 1338 BSS_CHANGED_BASIC_RATES | 1339 BSS_CHANGED_BEACON_INT))) 1340 if (ieee80211_mesh_rebuild_beacon(sdata)) 1341 return; 1342 1343 ieee80211_bss_info_change_notify(sdata, changed); 1344 } 1345 1346 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 1347 { 1348 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1349 1350 sdata_lock(sdata); 1351 1352 /* mesh already went down */ 1353 if (!sdata->u.mesh.mesh_id_len) 1354 goto out; 1355 1356 if (ifmsh->preq_queue_len && 1357 time_after(jiffies, 1358 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) 1359 mesh_path_start_discovery(sdata); 1360 1361 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) 1362 ieee80211_mesh_housekeeping(sdata); 1363 1364 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) 1365 ieee80211_mesh_rootpath(sdata); 1366 1367 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags)) 1368 mesh_sync_adjust_tbtt(sdata); 1369 1370 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags)) 1371 mesh_bss_info_changed(sdata); 1372 out: 1373 sdata_unlock(sdata); 1374 } 1375 1376 1377 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 1378 { 1379 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1380 static u8 zero_addr[ETH_ALEN] = {}; 1381 1382 setup_timer(&ifmsh->housekeeping_timer, 1383 ieee80211_mesh_housekeeping_timer, 1384 (unsigned long) sdata); 1385 1386 ifmsh->accepting_plinks = true; 1387 atomic_set(&ifmsh->mpaths, 0); 1388 mesh_rmc_init(sdata); 1389 ifmsh->last_preq = jiffies; 1390 ifmsh->next_perr = jiffies; 1391 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE; 1392 /* Allocate all mesh structures when creating the first mesh interface. */ 1393 if (!mesh_allocated) 1394 ieee80211s_init(); 1395 1396 mesh_pathtbl_init(sdata); 1397 1398 setup_timer(&ifmsh->mesh_path_timer, 1399 ieee80211_mesh_path_timer, 1400 (unsigned long) sdata); 1401 setup_timer(&ifmsh->mesh_path_root_timer, 1402 ieee80211_mesh_path_root_timer, 1403 (unsigned long) sdata); 1404 INIT_LIST_HEAD(&ifmsh->preq_queue.list); 1405 skb_queue_head_init(&ifmsh->ps.bc_buf); 1406 spin_lock_init(&ifmsh->mesh_preq_queue_lock); 1407 spin_lock_init(&ifmsh->sync_offset_lock); 1408 RCU_INIT_POINTER(ifmsh->beacon, NULL); 1409 1410 sdata->vif.bss_conf.bssid = zero_addr; 1411 } 1412 1413 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata) 1414 { 1415 mesh_rmc_free(sdata); 1416 mesh_pathtbl_unregister(sdata); 1417 } 1418