1 /* 2 * Copyright (c) 2008, 2009 open80211s Ltd. 3 * Author: Luis Carlos Cobo <luisca@cozybit.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 #include <linux/gfp.h> 10 #include <linux/kernel.h> 11 #include <linux/random.h> 12 #include "ieee80211_i.h" 13 #include "rate.h" 14 #include "mesh.h" 15 16 #define PLINK_GET_LLID(p) (p + 2) 17 #define PLINK_GET_PLID(p) (p + 4) 18 19 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \ 20 jiffies + HZ * t / 1000)) 21 22 #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries) 23 #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout) 24 #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout) 25 #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout) 26 #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks) 27 28 /* We only need a valid sta if user configured a minimum rssi_threshold. */ 29 #define rssi_threshold_check(sta, sdata) \ 30 (sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\ 31 (sta && (s8) -ewma_read(&sta->avg_signal) > \ 32 sdata->u.mesh.mshcfg.rssi_threshold)) 33 34 enum plink_event { 35 PLINK_UNDEFINED, 36 OPN_ACPT, 37 OPN_RJCT, 38 OPN_IGNR, 39 CNF_ACPT, 40 CNF_RJCT, 41 CNF_IGNR, 42 CLS_ACPT, 43 CLS_IGNR 44 }; 45 46 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, 47 enum ieee80211_self_protected_actioncode action, 48 u8 *da, __le16 llid, __le16 plid, __le16 reason); 49 50 static inline 51 void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) 52 { 53 atomic_inc(&sdata->u.mesh.mshstats.estab_plinks); 54 mesh_accept_plinks_update(sdata); 55 } 56 57 static inline 58 void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) 59 { 60 atomic_dec(&sdata->u.mesh.mshstats.estab_plinks); 61 mesh_accept_plinks_update(sdata); 62 } 63 64 /** 65 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine 66 * 67 * @sta: mesh peer link to restart 68 * 69 * Locking: this function must be called holding sta->lock 70 */ 71 static inline void mesh_plink_fsm_restart(struct sta_info *sta) 72 { 73 sta->plink_state = NL80211_PLINK_LISTEN; 74 sta->llid = sta->plid = sta->reason = 0; 75 sta->plink_retries = 0; 76 } 77 78 /* 79 * Allocate mesh sta entry and insert into station table 80 */ 81 static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, 82 u8 *hw_addr) 83 { 84 struct sta_info *sta; 85 86 if (sdata->local->num_sta >= MESH_MAX_PLINKS) 87 return NULL; 88 89 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); 90 if (!sta) 91 return NULL; 92 93 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 94 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 95 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 96 97 set_sta_flag(sta, WLAN_STA_WME); 98 99 return sta; 100 } 101 102 /** 103 * mesh_set_ht_prot_mode - set correct HT protection mode 104 * 105 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT 106 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT 107 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is 108 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode 109 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one 110 * HT20 peer is present. Otherwise no-protection mode is selected. 111 */ 112 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata) 113 { 114 struct ieee80211_local *local = sdata->local; 115 struct sta_info *sta; 116 u32 changed = 0; 117 u16 ht_opmode; 118 bool non_ht_sta = false, ht20_sta = false; 119 120 if (local->_oper_channel_type == NL80211_CHAN_NO_HT) 121 return 0; 122 123 rcu_read_lock(); 124 list_for_each_entry_rcu(sta, &local->sta_list, list) { 125 if (sdata != sta->sdata || 126 sta->plink_state != NL80211_PLINK_ESTAB) 127 continue; 128 129 switch (sta->ch_type) { 130 case NL80211_CHAN_NO_HT: 131 mpl_dbg(sdata, 132 "mesh_plink %pM: nonHT sta (%pM) is present\n", 133 sdata->vif.addr, sta->sta.addr); 134 non_ht_sta = true; 135 goto out; 136 case NL80211_CHAN_HT20: 137 mpl_dbg(sdata, 138 "mesh_plink %pM: HT20 sta (%pM) is present\n", 139 sdata->vif.addr, sta->sta.addr); 140 ht20_sta = true; 141 default: 142 break; 143 } 144 } 145 out: 146 rcu_read_unlock(); 147 148 if (non_ht_sta) 149 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED; 150 else if (ht20_sta && local->_oper_channel_type > NL80211_CHAN_HT20) 151 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ; 152 else 153 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE; 154 155 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { 156 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 157 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode; 158 changed = BSS_CHANGED_HT; 159 mpl_dbg(sdata, 160 "mesh_plink %pM: protection mode changed to %d\n", 161 sdata->vif.addr, ht_opmode); 162 } 163 164 return changed; 165 } 166 167 /** 168 * __mesh_plink_deactivate - deactivate mesh peer link 169 * 170 * @sta: mesh peer link to deactivate 171 * 172 * All mesh paths with this peer as next hop will be flushed 173 * 174 * Locking: the caller must hold sta->lock 175 */ 176 static bool __mesh_plink_deactivate(struct sta_info *sta) 177 { 178 struct ieee80211_sub_if_data *sdata = sta->sdata; 179 bool deactivated = false; 180 181 if (sta->plink_state == NL80211_PLINK_ESTAB) { 182 mesh_plink_dec_estab_count(sdata); 183 deactivated = true; 184 } 185 sta->plink_state = NL80211_PLINK_BLOCKED; 186 mesh_path_flush_by_nexthop(sta); 187 188 return deactivated; 189 } 190 191 /** 192 * mesh_plink_deactivate - deactivate mesh peer link 193 * 194 * @sta: mesh peer link to deactivate 195 * 196 * All mesh paths with this peer as next hop will be flushed 197 */ 198 void mesh_plink_deactivate(struct sta_info *sta) 199 { 200 struct ieee80211_sub_if_data *sdata = sta->sdata; 201 bool deactivated; 202 203 spin_lock_bh(&sta->lock); 204 deactivated = __mesh_plink_deactivate(sta); 205 sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED); 206 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 207 sta->sta.addr, sta->llid, sta->plid, 208 sta->reason); 209 spin_unlock_bh(&sta->lock); 210 211 if (deactivated) 212 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); 213 } 214 215 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, 216 enum ieee80211_self_protected_actioncode action, 217 u8 *da, __le16 llid, __le16 plid, __le16 reason) { 218 struct ieee80211_local *local = sdata->local; 219 struct sk_buff *skb; 220 struct ieee80211_mgmt *mgmt; 221 bool include_plid = false; 222 u16 peering_proto = 0; 223 u8 *pos, ie_len = 4; 224 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + 225 sizeof(mgmt->u.action.u.self_prot); 226 227 skb = dev_alloc_skb(local->tx_headroom + 228 hdr_len + 229 2 + /* capability info */ 230 2 + /* AID */ 231 2 + 8 + /* supported rates */ 232 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 233 2 + sdata->u.mesh.mesh_id_len + 234 2 + sizeof(struct ieee80211_meshconf_ie) + 235 2 + sizeof(struct ieee80211_ht_cap) + 236 2 + sizeof(struct ieee80211_ht_operation) + 237 2 + 8 + /* peering IE */ 238 sdata->u.mesh.ie_len); 239 if (!skb) 240 return -1; 241 skb_reserve(skb, local->tx_headroom); 242 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 243 memset(mgmt, 0, hdr_len); 244 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 245 IEEE80211_STYPE_ACTION); 246 memcpy(mgmt->da, da, ETH_ALEN); 247 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 248 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 249 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; 250 mgmt->u.action.u.self_prot.action_code = action; 251 252 if (action != WLAN_SP_MESH_PEERING_CLOSE) { 253 /* capability info */ 254 pos = skb_put(skb, 2); 255 memset(pos, 0, 2); 256 if (action == WLAN_SP_MESH_PEERING_CONFIRM) { 257 /* AID */ 258 pos = skb_put(skb, 2); 259 memcpy(pos + 2, &plid, 2); 260 } 261 if (ieee80211_add_srates_ie(sdata, skb, true) || 262 ieee80211_add_ext_srates_ie(sdata, skb, true) || 263 mesh_add_rsn_ie(skb, sdata) || 264 mesh_add_meshid_ie(skb, sdata) || 265 mesh_add_meshconf_ie(skb, sdata)) 266 return -1; 267 } else { /* WLAN_SP_MESH_PEERING_CLOSE */ 268 if (mesh_add_meshid_ie(skb, sdata)) 269 return -1; 270 } 271 272 /* Add Mesh Peering Management element */ 273 switch (action) { 274 case WLAN_SP_MESH_PEERING_OPEN: 275 break; 276 case WLAN_SP_MESH_PEERING_CONFIRM: 277 ie_len += 2; 278 include_plid = true; 279 break; 280 case WLAN_SP_MESH_PEERING_CLOSE: 281 if (plid) { 282 ie_len += 2; 283 include_plid = true; 284 } 285 ie_len += 2; /* reason code */ 286 break; 287 default: 288 return -EINVAL; 289 } 290 291 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) 292 return -ENOMEM; 293 294 pos = skb_put(skb, 2 + ie_len); 295 *pos++ = WLAN_EID_PEER_MGMT; 296 *pos++ = ie_len; 297 memcpy(pos, &peering_proto, 2); 298 pos += 2; 299 memcpy(pos, &llid, 2); 300 pos += 2; 301 if (include_plid) { 302 memcpy(pos, &plid, 2); 303 pos += 2; 304 } 305 if (action == WLAN_SP_MESH_PEERING_CLOSE) { 306 memcpy(pos, &reason, 2); 307 pos += 2; 308 } 309 310 if (action != WLAN_SP_MESH_PEERING_CLOSE) { 311 if (mesh_add_ht_cap_ie(skb, sdata) || 312 mesh_add_ht_oper_ie(skb, sdata)) 313 return -1; 314 } 315 316 if (mesh_add_vendor_ies(skb, sdata)) 317 return -1; 318 319 ieee80211_tx_skb(sdata, skb); 320 return 0; 321 } 322 323 /** 324 * mesh_peer_init - initialize new mesh peer and return resulting sta_info 325 * 326 * @sdata: local meshif 327 * @addr: peer's address 328 * @elems: IEs from beacon or mesh peering frame 329 * 330 * call under RCU 331 */ 332 static struct sta_info *mesh_peer_init(struct ieee80211_sub_if_data *sdata, 333 u8 *addr, 334 struct ieee802_11_elems *elems) 335 { 336 struct ieee80211_local *local = sdata->local; 337 enum ieee80211_band band = local->oper_channel->band; 338 struct ieee80211_supported_band *sband; 339 u32 rates, basic_rates = 0; 340 struct sta_info *sta; 341 bool insert = false; 342 343 sband = local->hw.wiphy->bands[band]; 344 rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates); 345 346 sta = sta_info_get(sdata, addr); 347 if (!sta) { 348 /* Userspace handles peer allocation when security is enabled */ 349 if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) { 350 cfg80211_notify_new_peer_candidate(sdata->dev, addr, 351 elems->ie_start, 352 elems->total_len, 353 GFP_ATOMIC); 354 return NULL; 355 } 356 357 sta = mesh_plink_alloc(sdata, addr); 358 if (!sta) 359 return NULL; 360 insert = true; 361 } 362 363 spin_lock_bh(&sta->lock); 364 sta->last_rx = jiffies; 365 sta->sta.supp_rates[band] = rates; 366 if (elems->ht_cap_elem && 367 sdata->local->_oper_channel_type != NL80211_CHAN_NO_HT) 368 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 369 elems->ht_cap_elem, 370 &sta->sta.ht_cap); 371 else 372 memset(&sta->sta.ht_cap, 0, sizeof(sta->sta.ht_cap)); 373 374 if (elems->ht_operation) { 375 if (!(elems->ht_operation->ht_param & 376 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) 377 sta->sta.ht_cap.cap &= 378 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 379 sta->ch_type = 380 ieee80211_ht_oper_to_channel_type(elems->ht_operation); 381 } 382 383 rate_control_rate_init(sta); 384 spin_unlock_bh(&sta->lock); 385 386 if (insert && sta_info_insert(sta)) 387 return NULL; 388 389 return sta; 390 } 391 392 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, 393 u8 *hw_addr, 394 struct ieee802_11_elems *elems) 395 { 396 struct sta_info *sta; 397 398 rcu_read_lock(); 399 sta = mesh_peer_init(sdata, hw_addr, elems); 400 if (!sta) 401 goto out; 402 403 if (mesh_peer_accepts_plinks(elems) && 404 sta->plink_state == NL80211_PLINK_LISTEN && 405 sdata->u.mesh.accepting_plinks && 406 sdata->u.mesh.mshcfg.auto_open_plinks && 407 rssi_threshold_check(sta, sdata)) 408 mesh_plink_open(sta); 409 410 out: 411 rcu_read_unlock(); 412 } 413 414 static void mesh_plink_timer(unsigned long data) 415 { 416 struct sta_info *sta; 417 __le16 llid, plid, reason; 418 struct ieee80211_sub_if_data *sdata; 419 420 /* 421 * This STA is valid because sta_info_destroy() will 422 * del_timer_sync() this timer after having made sure 423 * it cannot be readded (by deleting the plink.) 424 */ 425 sta = (struct sta_info *) data; 426 427 if (sta->sdata->local->quiescing) { 428 sta->plink_timer_was_running = true; 429 return; 430 } 431 432 spin_lock_bh(&sta->lock); 433 if (sta->ignore_plink_timer) { 434 sta->ignore_plink_timer = false; 435 spin_unlock_bh(&sta->lock); 436 return; 437 } 438 mpl_dbg(sta->sdata, 439 "Mesh plink timer for %pM fired on state %d\n", 440 sta->sta.addr, sta->plink_state); 441 reason = 0; 442 llid = sta->llid; 443 plid = sta->plid; 444 sdata = sta->sdata; 445 446 switch (sta->plink_state) { 447 case NL80211_PLINK_OPN_RCVD: 448 case NL80211_PLINK_OPN_SNT: 449 /* retry timer */ 450 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { 451 u32 rand; 452 mpl_dbg(sta->sdata, 453 "Mesh plink for %pM (retry, timeout): %d %d\n", 454 sta->sta.addr, sta->plink_retries, 455 sta->plink_timeout); 456 get_random_bytes(&rand, sizeof(u32)); 457 sta->plink_timeout = sta->plink_timeout + 458 rand % sta->plink_timeout; 459 ++sta->plink_retries; 460 mod_plink_timer(sta, sta->plink_timeout); 461 spin_unlock_bh(&sta->lock); 462 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, 463 sta->sta.addr, llid, 0, 0); 464 break; 465 } 466 reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES); 467 /* fall through on else */ 468 case NL80211_PLINK_CNF_RCVD: 469 /* confirm timer */ 470 if (!reason) 471 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT); 472 sta->plink_state = NL80211_PLINK_HOLDING; 473 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); 474 spin_unlock_bh(&sta->lock); 475 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 476 sta->sta.addr, llid, plid, reason); 477 break; 478 case NL80211_PLINK_HOLDING: 479 /* holding timer */ 480 del_timer(&sta->plink_timer); 481 mesh_plink_fsm_restart(sta); 482 spin_unlock_bh(&sta->lock); 483 break; 484 default: 485 spin_unlock_bh(&sta->lock); 486 break; 487 } 488 } 489 490 #ifdef CONFIG_PM 491 void mesh_plink_quiesce(struct sta_info *sta) 492 { 493 if (del_timer_sync(&sta->plink_timer)) 494 sta->plink_timer_was_running = true; 495 } 496 497 void mesh_plink_restart(struct sta_info *sta) 498 { 499 if (sta->plink_timer_was_running) { 500 add_timer(&sta->plink_timer); 501 sta->plink_timer_was_running = false; 502 } 503 } 504 #endif 505 506 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) 507 { 508 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); 509 sta->plink_timer.data = (unsigned long) sta; 510 sta->plink_timer.function = mesh_plink_timer; 511 sta->plink_timeout = timeout; 512 add_timer(&sta->plink_timer); 513 } 514 515 int mesh_plink_open(struct sta_info *sta) 516 { 517 __le16 llid; 518 struct ieee80211_sub_if_data *sdata = sta->sdata; 519 520 if (!test_sta_flag(sta, WLAN_STA_AUTH)) 521 return -EPERM; 522 523 spin_lock_bh(&sta->lock); 524 get_random_bytes(&llid, 2); 525 sta->llid = llid; 526 if (sta->plink_state != NL80211_PLINK_LISTEN) { 527 spin_unlock_bh(&sta->lock); 528 return -EBUSY; 529 } 530 sta->plink_state = NL80211_PLINK_OPN_SNT; 531 mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); 532 spin_unlock_bh(&sta->lock); 533 mpl_dbg(sdata, 534 "Mesh plink: starting establishment with %pM\n", 535 sta->sta.addr); 536 537 return mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, 538 sta->sta.addr, llid, 0, 0); 539 } 540 541 void mesh_plink_block(struct sta_info *sta) 542 { 543 struct ieee80211_sub_if_data *sdata = sta->sdata; 544 bool deactivated; 545 546 spin_lock_bh(&sta->lock); 547 deactivated = __mesh_plink_deactivate(sta); 548 sta->plink_state = NL80211_PLINK_BLOCKED; 549 spin_unlock_bh(&sta->lock); 550 551 if (deactivated) 552 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); 553 } 554 555 556 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, 557 size_t len, struct ieee80211_rx_status *rx_status) 558 { 559 struct ieee802_11_elems elems; 560 struct sta_info *sta; 561 enum plink_event event; 562 enum ieee80211_self_protected_actioncode ftype; 563 size_t baselen; 564 bool matches_local = true; 565 u8 ie_len; 566 u8 *baseaddr; 567 u32 changed = 0; 568 __le16 plid, llid, reason; 569 static const char *mplstates[] = { 570 [NL80211_PLINK_LISTEN] = "LISTEN", 571 [NL80211_PLINK_OPN_SNT] = "OPN-SNT", 572 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD", 573 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD", 574 [NL80211_PLINK_ESTAB] = "ESTAB", 575 [NL80211_PLINK_HOLDING] = "HOLDING", 576 [NL80211_PLINK_BLOCKED] = "BLOCKED" 577 }; 578 579 /* need action_code, aux */ 580 if (len < IEEE80211_MIN_ACTION_SIZE + 3) 581 return; 582 583 if (is_multicast_ether_addr(mgmt->da)) { 584 mpl_dbg(sdata, 585 "Mesh plink: ignore frame from multicast address\n"); 586 return; 587 } 588 589 baseaddr = mgmt->u.action.u.self_prot.variable; 590 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; 591 if (mgmt->u.action.u.self_prot.action_code == 592 WLAN_SP_MESH_PEERING_CONFIRM) { 593 baseaddr += 4; 594 baselen += 4; 595 } 596 ieee802_11_parse_elems(baseaddr, len - baselen, &elems); 597 if (!elems.peering) { 598 mpl_dbg(sdata, 599 "Mesh plink: missing necessary peer link ie\n"); 600 return; 601 } 602 if (elems.rsn_len && 603 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { 604 mpl_dbg(sdata, 605 "Mesh plink: can't establish link with secure peer\n"); 606 return; 607 } 608 609 ftype = mgmt->u.action.u.self_prot.action_code; 610 ie_len = elems.peering_len; 611 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || 612 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || 613 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 614 && ie_len != 8)) { 615 mpl_dbg(sdata, 616 "Mesh plink: incorrect plink ie length %d %d\n", 617 ftype, ie_len); 618 return; 619 } 620 621 if (ftype != WLAN_SP_MESH_PEERING_CLOSE && 622 (!elems.mesh_id || !elems.mesh_config)) { 623 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n"); 624 return; 625 } 626 /* Note the lines below are correct, the llid in the frame is the plid 627 * from the point of view of this host. 628 */ 629 memcpy(&plid, PLINK_GET_LLID(elems.peering), 2); 630 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || 631 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) 632 memcpy(&llid, PLINK_GET_PLID(elems.peering), 2); 633 634 rcu_read_lock(); 635 636 sta = sta_info_get(sdata, mgmt->sa); 637 if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) { 638 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n"); 639 rcu_read_unlock(); 640 return; 641 } 642 643 if (ftype == WLAN_SP_MESH_PEERING_OPEN && 644 !rssi_threshold_check(sta, sdata)) { 645 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n", 646 mgmt->sa); 647 rcu_read_unlock(); 648 return; 649 } 650 651 if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) { 652 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n"); 653 rcu_read_unlock(); 654 return; 655 } 656 657 if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) { 658 rcu_read_unlock(); 659 return; 660 } 661 662 /* Now we will figure out the appropriate event... */ 663 event = PLINK_UNDEFINED; 664 if (ftype != WLAN_SP_MESH_PEERING_CLOSE && 665 !mesh_matches_local(sdata, &elems)) { 666 matches_local = false; 667 switch (ftype) { 668 case WLAN_SP_MESH_PEERING_OPEN: 669 event = OPN_RJCT; 670 break; 671 case WLAN_SP_MESH_PEERING_CONFIRM: 672 event = CNF_RJCT; 673 break; 674 default: 675 break; 676 } 677 } 678 679 if (!sta && !matches_local) { 680 rcu_read_unlock(); 681 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 682 llid = 0; 683 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 684 mgmt->sa, llid, plid, reason); 685 return; 686 } else if (!sta) { 687 /* ftype == WLAN_SP_MESH_PEERING_OPEN */ 688 if (!mesh_plink_free_count(sdata)) { 689 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n"); 690 rcu_read_unlock(); 691 return; 692 } 693 event = OPN_ACPT; 694 } else if (matches_local) { 695 switch (ftype) { 696 case WLAN_SP_MESH_PEERING_OPEN: 697 if (!mesh_plink_free_count(sdata) || 698 (sta->plid && sta->plid != plid)) 699 event = OPN_IGNR; 700 else 701 event = OPN_ACPT; 702 break; 703 case WLAN_SP_MESH_PEERING_CONFIRM: 704 if (!mesh_plink_free_count(sdata) || 705 (sta->llid != llid || sta->plid != plid)) 706 event = CNF_IGNR; 707 else 708 event = CNF_ACPT; 709 break; 710 case WLAN_SP_MESH_PEERING_CLOSE: 711 if (sta->plink_state == NL80211_PLINK_ESTAB) 712 /* Do not check for llid or plid. This does not 713 * follow the standard but since multiple plinks 714 * per sta are not supported, it is necessary in 715 * order to avoid a livelock when MP A sees an 716 * establish peer link to MP B but MP B does not 717 * see it. This can be caused by a timeout in 718 * B's peer link establishment or B beign 719 * restarted. 720 */ 721 event = CLS_ACPT; 722 else if (sta->plid != plid) 723 event = CLS_IGNR; 724 else if (ie_len == 7 && sta->llid != llid) 725 event = CLS_IGNR; 726 else 727 event = CLS_ACPT; 728 break; 729 default: 730 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n"); 731 rcu_read_unlock(); 732 return; 733 } 734 } 735 736 if (event == OPN_ACPT) { 737 /* allocate sta entry if necessary and update info */ 738 sta = mesh_peer_init(sdata, mgmt->sa, &elems); 739 if (!sta) { 740 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n"); 741 rcu_read_unlock(); 742 return; 743 } 744 } 745 746 mpl_dbg(sdata, 747 "Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n", 748 mgmt->sa, mplstates[sta->plink_state], 749 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), 750 event); 751 reason = 0; 752 spin_lock_bh(&sta->lock); 753 switch (sta->plink_state) { 754 /* spin_unlock as soon as state is updated at each case */ 755 case NL80211_PLINK_LISTEN: 756 switch (event) { 757 case CLS_ACPT: 758 mesh_plink_fsm_restart(sta); 759 spin_unlock_bh(&sta->lock); 760 break; 761 case OPN_ACPT: 762 sta->plink_state = NL80211_PLINK_OPN_RCVD; 763 sta->plid = plid; 764 get_random_bytes(&llid, 2); 765 sta->llid = llid; 766 mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); 767 spin_unlock_bh(&sta->lock); 768 mesh_plink_frame_tx(sdata, 769 WLAN_SP_MESH_PEERING_OPEN, 770 sta->sta.addr, llid, 0, 0); 771 mesh_plink_frame_tx(sdata, 772 WLAN_SP_MESH_PEERING_CONFIRM, 773 sta->sta.addr, llid, plid, 0); 774 break; 775 default: 776 spin_unlock_bh(&sta->lock); 777 break; 778 } 779 break; 780 781 case NL80211_PLINK_OPN_SNT: 782 switch (event) { 783 case OPN_RJCT: 784 case CNF_RJCT: 785 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 786 case CLS_ACPT: 787 if (!reason) 788 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 789 sta->reason = reason; 790 sta->plink_state = NL80211_PLINK_HOLDING; 791 if (!mod_plink_timer(sta, 792 dot11MeshHoldingTimeout(sdata))) 793 sta->ignore_plink_timer = true; 794 795 llid = sta->llid; 796 spin_unlock_bh(&sta->lock); 797 mesh_plink_frame_tx(sdata, 798 WLAN_SP_MESH_PEERING_CLOSE, 799 sta->sta.addr, llid, plid, reason); 800 break; 801 case OPN_ACPT: 802 /* retry timer is left untouched */ 803 sta->plink_state = NL80211_PLINK_OPN_RCVD; 804 sta->plid = plid; 805 llid = sta->llid; 806 spin_unlock_bh(&sta->lock); 807 mesh_plink_frame_tx(sdata, 808 WLAN_SP_MESH_PEERING_CONFIRM, 809 sta->sta.addr, llid, plid, 0); 810 break; 811 case CNF_ACPT: 812 sta->plink_state = NL80211_PLINK_CNF_RCVD; 813 if (!mod_plink_timer(sta, 814 dot11MeshConfirmTimeout(sdata))) 815 sta->ignore_plink_timer = true; 816 817 spin_unlock_bh(&sta->lock); 818 break; 819 default: 820 spin_unlock_bh(&sta->lock); 821 break; 822 } 823 break; 824 825 case NL80211_PLINK_OPN_RCVD: 826 switch (event) { 827 case OPN_RJCT: 828 case CNF_RJCT: 829 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 830 case CLS_ACPT: 831 if (!reason) 832 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 833 sta->reason = reason; 834 sta->plink_state = NL80211_PLINK_HOLDING; 835 if (!mod_plink_timer(sta, 836 dot11MeshHoldingTimeout(sdata))) 837 sta->ignore_plink_timer = true; 838 839 llid = sta->llid; 840 spin_unlock_bh(&sta->lock); 841 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 842 sta->sta.addr, llid, plid, reason); 843 break; 844 case OPN_ACPT: 845 llid = sta->llid; 846 spin_unlock_bh(&sta->lock); 847 mesh_plink_frame_tx(sdata, 848 WLAN_SP_MESH_PEERING_CONFIRM, 849 sta->sta.addr, llid, plid, 0); 850 break; 851 case CNF_ACPT: 852 del_timer(&sta->plink_timer); 853 sta->plink_state = NL80211_PLINK_ESTAB; 854 spin_unlock_bh(&sta->lock); 855 mesh_plink_inc_estab_count(sdata); 856 changed |= mesh_set_ht_prot_mode(sdata); 857 changed |= BSS_CHANGED_BEACON; 858 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", 859 sta->sta.addr); 860 break; 861 default: 862 spin_unlock_bh(&sta->lock); 863 break; 864 } 865 break; 866 867 case NL80211_PLINK_CNF_RCVD: 868 switch (event) { 869 case OPN_RJCT: 870 case CNF_RJCT: 871 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 872 case CLS_ACPT: 873 if (!reason) 874 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 875 sta->reason = reason; 876 sta->plink_state = NL80211_PLINK_HOLDING; 877 if (!mod_plink_timer(sta, 878 dot11MeshHoldingTimeout(sdata))) 879 sta->ignore_plink_timer = true; 880 881 llid = sta->llid; 882 spin_unlock_bh(&sta->lock); 883 mesh_plink_frame_tx(sdata, 884 WLAN_SP_MESH_PEERING_CLOSE, 885 sta->sta.addr, llid, plid, reason); 886 break; 887 case OPN_ACPT: 888 del_timer(&sta->plink_timer); 889 sta->plink_state = NL80211_PLINK_ESTAB; 890 spin_unlock_bh(&sta->lock); 891 mesh_plink_inc_estab_count(sdata); 892 changed |= mesh_set_ht_prot_mode(sdata); 893 changed |= BSS_CHANGED_BEACON; 894 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", 895 sta->sta.addr); 896 mesh_plink_frame_tx(sdata, 897 WLAN_SP_MESH_PEERING_CONFIRM, 898 sta->sta.addr, llid, plid, 0); 899 break; 900 default: 901 spin_unlock_bh(&sta->lock); 902 break; 903 } 904 break; 905 906 case NL80211_PLINK_ESTAB: 907 switch (event) { 908 case CLS_ACPT: 909 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 910 sta->reason = reason; 911 __mesh_plink_deactivate(sta); 912 sta->plink_state = NL80211_PLINK_HOLDING; 913 llid = sta->llid; 914 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); 915 spin_unlock_bh(&sta->lock); 916 changed |= mesh_set_ht_prot_mode(sdata); 917 changed |= BSS_CHANGED_BEACON; 918 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 919 sta->sta.addr, llid, plid, reason); 920 break; 921 case OPN_ACPT: 922 llid = sta->llid; 923 spin_unlock_bh(&sta->lock); 924 mesh_plink_frame_tx(sdata, 925 WLAN_SP_MESH_PEERING_CONFIRM, 926 sta->sta.addr, llid, plid, 0); 927 break; 928 default: 929 spin_unlock_bh(&sta->lock); 930 break; 931 } 932 break; 933 case NL80211_PLINK_HOLDING: 934 switch (event) { 935 case CLS_ACPT: 936 if (del_timer(&sta->plink_timer)) 937 sta->ignore_plink_timer = 1; 938 mesh_plink_fsm_restart(sta); 939 spin_unlock_bh(&sta->lock); 940 break; 941 case OPN_ACPT: 942 case CNF_ACPT: 943 case OPN_RJCT: 944 case CNF_RJCT: 945 llid = sta->llid; 946 reason = sta->reason; 947 spin_unlock_bh(&sta->lock); 948 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 949 sta->sta.addr, llid, plid, reason); 950 break; 951 default: 952 spin_unlock_bh(&sta->lock); 953 } 954 break; 955 default: 956 /* should not get here, PLINK_BLOCKED is dealt with at the 957 * beginning of the function 958 */ 959 spin_unlock_bh(&sta->lock); 960 break; 961 } 962 963 rcu_read_unlock(); 964 965 if (changed) 966 ieee80211_bss_info_change_notify(sdata, changed); 967 } 968