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