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 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG 17 #define mpl_dbg(fmt, args...) printk(KERN_DEBUG fmt, ##args) 18 #else 19 #define mpl_dbg(fmt, args...) do { (void)(0); } while (0) 20 #endif 21 22 #define PLINK_GET_LLID(p) (p + 2) 23 #define PLINK_GET_PLID(p) (p + 4) 24 25 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \ 26 jiffies + HZ * t / 1000)) 27 28 #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries) 29 #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout) 30 #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout) 31 #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout) 32 #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks) 33 34 /* We only need a valid sta if user configured a minimum rssi_threshold. */ 35 #define rssi_threshold_check(sta, sdata) \ 36 (sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\ 37 (sta && (s8) -ewma_read(&sta->avg_signal) > \ 38 sdata->u.mesh.mshcfg.rssi_threshold)) 39 40 enum plink_event { 41 PLINK_UNDEFINED, 42 OPN_ACPT, 43 OPN_RJCT, 44 OPN_IGNR, 45 CNF_ACPT, 46 CNF_RJCT, 47 CNF_IGNR, 48 CLS_ACPT, 49 CLS_IGNR 50 }; 51 52 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, 53 enum ieee80211_self_protected_actioncode action, 54 u8 *da, __le16 llid, __le16 plid, __le16 reason); 55 56 static inline 57 void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) 58 { 59 atomic_inc(&sdata->u.mesh.mshstats.estab_plinks); 60 mesh_accept_plinks_update(sdata); 61 } 62 63 static inline 64 void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) 65 { 66 atomic_dec(&sdata->u.mesh.mshstats.estab_plinks); 67 mesh_accept_plinks_update(sdata); 68 } 69 70 /** 71 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine 72 * 73 * @sta: mesh peer link to restart 74 * 75 * Locking: this function must be called holding sta->lock 76 */ 77 static inline void mesh_plink_fsm_restart(struct sta_info *sta) 78 { 79 sta->plink_state = NL80211_PLINK_LISTEN; 80 sta->llid = sta->plid = sta->reason = 0; 81 sta->plink_retries = 0; 82 } 83 84 /* 85 * Allocate mesh sta entry and insert into station table 86 */ 87 static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, 88 u8 *hw_addr) 89 { 90 struct sta_info *sta; 91 92 if (sdata->local->num_sta >= MESH_MAX_PLINKS) 93 return NULL; 94 95 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); 96 if (!sta) 97 return NULL; 98 99 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 100 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 101 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 102 103 set_sta_flag(sta, WLAN_STA_WME); 104 105 return sta; 106 } 107 108 /* 109 * mesh_set_ht_prot_mode - set correct HT protection mode 110 * 111 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT 112 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT 113 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is 114 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode 115 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one 116 * HT20 peer is present. Otherwise no-protection mode is selected. 117 */ 118 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata) 119 { 120 struct ieee80211_local *local = sdata->local; 121 struct sta_info *sta; 122 u32 changed = 0; 123 u16 ht_opmode; 124 bool non_ht_sta = false, ht20_sta = false; 125 126 if (local->_oper_channel_type == NL80211_CHAN_NO_HT) 127 return 0; 128 129 rcu_read_lock(); 130 list_for_each_entry_rcu(sta, &local->sta_list, list) { 131 if (sdata != sta->sdata || 132 sta->plink_state != NL80211_PLINK_ESTAB) 133 continue; 134 135 switch (sta->ch_type) { 136 case NL80211_CHAN_NO_HT: 137 mpl_dbg("mesh_plink %pM: nonHT sta (%pM) is present", 138 sdata->vif.addr, sta->sta.addr); 139 non_ht_sta = true; 140 goto out; 141 case NL80211_CHAN_HT20: 142 mpl_dbg("mesh_plink %pM: HT20 sta (%pM) is present", 143 sdata->vif.addr, sta->sta.addr); 144 ht20_sta = true; 145 default: 146 break; 147 } 148 } 149 out: 150 rcu_read_unlock(); 151 152 if (non_ht_sta) 153 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED; 154 else if (ht20_sta && local->_oper_channel_type > NL80211_CHAN_HT20) 155 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ; 156 else 157 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE; 158 159 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { 160 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 161 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode; 162 changed = BSS_CHANGED_HT; 163 mpl_dbg("mesh_plink %pM: protection mode changed to %d", 164 sdata->vif.addr, ht_opmode); 165 } 166 167 return changed; 168 } 169 170 /** 171 * __mesh_plink_deactivate - deactivate mesh peer link 172 * 173 * @sta: mesh peer link to deactivate 174 * 175 * All mesh paths with this peer as next hop will be flushed 176 * 177 * Locking: the caller must hold sta->lock 178 */ 179 static bool __mesh_plink_deactivate(struct sta_info *sta) 180 { 181 struct ieee80211_sub_if_data *sdata = sta->sdata; 182 bool deactivated = false; 183 184 if (sta->plink_state == NL80211_PLINK_ESTAB) { 185 mesh_plink_dec_estab_count(sdata); 186 deactivated = true; 187 } 188 sta->plink_state = NL80211_PLINK_BLOCKED; 189 mesh_path_flush_by_nexthop(sta); 190 191 return deactivated; 192 } 193 194 /** 195 * mesh_plink_deactivate - deactivate mesh peer link 196 * 197 * @sta: mesh peer link to deactivate 198 * 199 * All mesh paths with this peer as next hop will be flushed 200 */ 201 void mesh_plink_deactivate(struct sta_info *sta) 202 { 203 struct ieee80211_sub_if_data *sdata = sta->sdata; 204 bool deactivated; 205 206 spin_lock_bh(&sta->lock); 207 deactivated = __mesh_plink_deactivate(sta); 208 sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED); 209 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 210 sta->sta.addr, sta->llid, sta->plid, 211 sta->reason); 212 spin_unlock_bh(&sta->lock); 213 214 if (deactivated) 215 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); 216 } 217 218 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, 219 enum ieee80211_self_protected_actioncode action, 220 u8 *da, __le16 llid, __le16 plid, __le16 reason) { 221 struct ieee80211_local *local = sdata->local; 222 struct sk_buff *skb; 223 struct ieee80211_mgmt *mgmt; 224 bool include_plid = false; 225 u16 peering_proto = 0; 226 u8 *pos, ie_len = 4; 227 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + 228 sizeof(mgmt->u.action.u.self_prot); 229 230 skb = dev_alloc_skb(local->tx_headroom + 231 hdr_len + 232 2 + /* capability info */ 233 2 + /* AID */ 234 2 + 8 + /* supported rates */ 235 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 236 2 + sdata->u.mesh.mesh_id_len + 237 2 + sizeof(struct ieee80211_meshconf_ie) + 238 2 + sizeof(struct ieee80211_ht_cap) + 239 2 + sizeof(struct ieee80211_ht_operation) + 240 2 + 8 + /* peering IE */ 241 sdata->u.mesh.ie_len); 242 if (!skb) 243 return -1; 244 skb_reserve(skb, local->tx_headroom); 245 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 246 memset(mgmt, 0, hdr_len); 247 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 248 IEEE80211_STYPE_ACTION); 249 memcpy(mgmt->da, da, ETH_ALEN); 250 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 251 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 252 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; 253 mgmt->u.action.u.self_prot.action_code = action; 254 255 if (action != WLAN_SP_MESH_PEERING_CLOSE) { 256 /* capability info */ 257 pos = skb_put(skb, 2); 258 memset(pos, 0, 2); 259 if (action == WLAN_SP_MESH_PEERING_CONFIRM) { 260 /* AID */ 261 pos = skb_put(skb, 2); 262 memcpy(pos + 2, &plid, 2); 263 } 264 if (ieee80211_add_srates_ie(&sdata->vif, skb, true) || 265 ieee80211_add_ext_srates_ie(&sdata->vif, skb, true) || 266 mesh_add_rsn_ie(skb, sdata) || 267 mesh_add_meshid_ie(skb, sdata) || 268 mesh_add_meshconf_ie(skb, sdata)) 269 return -1; 270 } else { /* WLAN_SP_MESH_PEERING_CLOSE */ 271 if (mesh_add_meshid_ie(skb, sdata)) 272 return -1; 273 } 274 275 /* Add Mesh Peering Management element */ 276 switch (action) { 277 case WLAN_SP_MESH_PEERING_OPEN: 278 break; 279 case WLAN_SP_MESH_PEERING_CONFIRM: 280 ie_len += 2; 281 include_plid = true; 282 break; 283 case WLAN_SP_MESH_PEERING_CLOSE: 284 if (plid) { 285 ie_len += 2; 286 include_plid = true; 287 } 288 ie_len += 2; /* reason code */ 289 break; 290 default: 291 return -EINVAL; 292 } 293 294 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) 295 return -ENOMEM; 296 297 pos = skb_put(skb, 2 + ie_len); 298 *pos++ = WLAN_EID_PEER_MGMT; 299 *pos++ = ie_len; 300 memcpy(pos, &peering_proto, 2); 301 pos += 2; 302 memcpy(pos, &llid, 2); 303 pos += 2; 304 if (include_plid) { 305 memcpy(pos, &plid, 2); 306 pos += 2; 307 } 308 if (action == WLAN_SP_MESH_PEERING_CLOSE) { 309 memcpy(pos, &reason, 2); 310 pos += 2; 311 } 312 313 if (action != WLAN_SP_MESH_PEERING_CLOSE) { 314 if (mesh_add_ht_cap_ie(skb, sdata) || 315 mesh_add_ht_oper_ie(skb, sdata)) 316 return -1; 317 } 318 319 if (mesh_add_vendor_ies(skb, sdata)) 320 return -1; 321 322 ieee80211_tx_skb(sdata, skb); 323 return 0; 324 } 325 326 /* mesh_peer_init - initialize new mesh peer and return resulting sta_info 327 * 328 * @sdata: local meshif 329 * @addr: peer's address 330 * @elems: IEs from beacon or mesh peering frame 331 * 332 * call under RCU 333 */ 334 static struct sta_info *mesh_peer_init(struct ieee80211_sub_if_data *sdata, 335 u8 *addr, 336 struct ieee802_11_elems *elems) 337 { 338 struct ieee80211_local *local = sdata->local; 339 enum ieee80211_band band = local->oper_channel->band; 340 struct ieee80211_supported_band *sband; 341 u32 rates, basic_rates = 0; 342 struct sta_info *sta; 343 bool insert = false; 344 345 sband = local->hw.wiphy->bands[band]; 346 rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates); 347 348 sta = sta_info_get(sdata, addr); 349 if (!sta) { 350 /* Userspace handles peer allocation when security is enabled */ 351 if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) { 352 cfg80211_notify_new_peer_candidate(sdata->dev, addr, 353 elems->ie_start, 354 elems->total_len, 355 GFP_ATOMIC); 356 return NULL; 357 } 358 359 sta = mesh_plink_alloc(sdata, addr); 360 if (!sta) 361 return NULL; 362 insert = true; 363 } 364 365 spin_lock_bh(&sta->lock); 366 sta->last_rx = jiffies; 367 sta->sta.supp_rates[band] = rates; 368 if (elems->ht_cap_elem && 369 sdata->local->_oper_channel_type != NL80211_CHAN_NO_HT) 370 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 371 elems->ht_cap_elem, 372 &sta->sta.ht_cap); 373 else 374 memset(&sta->sta.ht_cap, 0, sizeof(sta->sta.ht_cap)); 375 376 if (elems->ht_operation) { 377 if (!(elems->ht_operation->ht_param & 378 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) 379 sta->sta.ht_cap.cap &= 380 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 381 sta->ch_type = 382 ieee80211_ht_oper_to_channel_type(elems->ht_operation); 383 } 384 385 rate_control_rate_init(sta); 386 spin_unlock_bh(&sta->lock); 387 388 if (insert && sta_info_insert(sta)) 389 return NULL; 390 391 return sta; 392 } 393 394 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, 395 u8 *hw_addr, 396 struct ieee802_11_elems *elems) 397 { 398 struct sta_info *sta; 399 400 rcu_read_lock(); 401 sta = mesh_peer_init(sdata, hw_addr, elems); 402 if (!sta) 403 goto out; 404 405 if (mesh_peer_accepts_plinks(elems) && 406 sta->plink_state == NL80211_PLINK_LISTEN && 407 sdata->u.mesh.accepting_plinks && 408 sdata->u.mesh.mshcfg.auto_open_plinks && 409 rssi_threshold_check(sta, sdata)) 410 mesh_plink_open(sta); 411 412 out: 413 rcu_read_unlock(); 414 } 415 416 static void mesh_plink_timer(unsigned long data) 417 { 418 struct sta_info *sta; 419 __le16 llid, plid, reason; 420 struct ieee80211_sub_if_data *sdata; 421 422 /* 423 * This STA is valid because sta_info_destroy() will 424 * del_timer_sync() this timer after having made sure 425 * it cannot be readded (by deleting the plink.) 426 */ 427 sta = (struct sta_info *) data; 428 429 if (sta->sdata->local->quiescing) { 430 sta->plink_timer_was_running = true; 431 return; 432 } 433 434 spin_lock_bh(&sta->lock); 435 if (sta->ignore_plink_timer) { 436 sta->ignore_plink_timer = false; 437 spin_unlock_bh(&sta->lock); 438 return; 439 } 440 mpl_dbg("Mesh plink timer for %pM fired on state %d\n", 441 sta->sta.addr, sta->plink_state); 442 reason = 0; 443 llid = sta->llid; 444 plid = sta->plid; 445 sdata = sta->sdata; 446 447 switch (sta->plink_state) { 448 case NL80211_PLINK_OPN_RCVD: 449 case NL80211_PLINK_OPN_SNT: 450 /* retry timer */ 451 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { 452 u32 rand; 453 mpl_dbg("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("Mesh plink: starting establishment with %pM\n", 534 sta->sta.addr); 535 536 return mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, 537 sta->sta.addr, llid, 0, 0); 538 } 539 540 void mesh_plink_block(struct sta_info *sta) 541 { 542 struct ieee80211_sub_if_data *sdata = sta->sdata; 543 bool deactivated; 544 545 spin_lock_bh(&sta->lock); 546 deactivated = __mesh_plink_deactivate(sta); 547 sta->plink_state = NL80211_PLINK_BLOCKED; 548 spin_unlock_bh(&sta->lock); 549 550 if (deactivated) 551 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); 552 } 553 554 555 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, 556 size_t len, struct ieee80211_rx_status *rx_status) 557 { 558 struct ieee802_11_elems elems; 559 struct sta_info *sta; 560 enum plink_event event; 561 enum ieee80211_self_protected_actioncode ftype; 562 size_t baselen; 563 bool matches_local = true; 564 u8 ie_len; 565 u8 *baseaddr; 566 u32 changed = 0; 567 __le16 plid, llid, reason; 568 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG 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 #endif 579 580 /* need action_code, aux */ 581 if (len < IEEE80211_MIN_ACTION_SIZE + 3) 582 return; 583 584 if (is_multicast_ether_addr(mgmt->da)) { 585 mpl_dbg("Mesh plink: ignore frame from multicast address"); 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("Mesh plink: missing necessary peer link ie\n"); 599 return; 600 } 601 if (elems.rsn_len && 602 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { 603 mpl_dbg("Mesh plink: can't establish link with secure peer\n"); 604 return; 605 } 606 607 ftype = mgmt->u.action.u.self_prot.action_code; 608 ie_len = elems.peering_len; 609 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || 610 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || 611 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 612 && ie_len != 8)) { 613 mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n", 614 ftype, ie_len); 615 return; 616 } 617 618 if (ftype != WLAN_SP_MESH_PEERING_CLOSE && 619 (!elems.mesh_id || !elems.mesh_config)) { 620 mpl_dbg("Mesh plink: missing necessary ie\n"); 621 return; 622 } 623 /* Note the lines below are correct, the llid in the frame is the plid 624 * from the point of view of this host. 625 */ 626 memcpy(&plid, PLINK_GET_LLID(elems.peering), 2); 627 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || 628 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) 629 memcpy(&llid, PLINK_GET_PLID(elems.peering), 2); 630 631 rcu_read_lock(); 632 633 sta = sta_info_get(sdata, mgmt->sa); 634 if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) { 635 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); 636 rcu_read_unlock(); 637 return; 638 } 639 640 if (ftype == WLAN_SP_MESH_PEERING_OPEN && 641 !rssi_threshold_check(sta, sdata)) { 642 mpl_dbg("Mesh plink: %pM does not meet rssi threshold\n", 643 mgmt->sa); 644 rcu_read_unlock(); 645 return; 646 } 647 648 if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) { 649 mpl_dbg("Mesh plink: Action frame from non-authed peer\n"); 650 rcu_read_unlock(); 651 return; 652 } 653 654 if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) { 655 rcu_read_unlock(); 656 return; 657 } 658 659 /* Now we will figure out the appropriate event... */ 660 event = PLINK_UNDEFINED; 661 if (ftype != WLAN_SP_MESH_PEERING_CLOSE && 662 !mesh_matches_local(sdata, &elems)) { 663 matches_local = false; 664 switch (ftype) { 665 case WLAN_SP_MESH_PEERING_OPEN: 666 event = OPN_RJCT; 667 break; 668 case WLAN_SP_MESH_PEERING_CONFIRM: 669 event = CNF_RJCT; 670 break; 671 default: 672 break; 673 } 674 } 675 676 if (!sta && !matches_local) { 677 rcu_read_unlock(); 678 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 679 llid = 0; 680 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 681 mgmt->sa, llid, plid, reason); 682 return; 683 } else if (!sta) { 684 /* ftype == WLAN_SP_MESH_PEERING_OPEN */ 685 if (!mesh_plink_free_count(sdata)) { 686 mpl_dbg("Mesh plink error: no more free plinks\n"); 687 rcu_read_unlock(); 688 return; 689 } 690 event = OPN_ACPT; 691 } else if (matches_local) { 692 switch (ftype) { 693 case WLAN_SP_MESH_PEERING_OPEN: 694 if (!mesh_plink_free_count(sdata) || 695 (sta->plid && sta->plid != plid)) 696 event = OPN_IGNR; 697 else 698 event = OPN_ACPT; 699 break; 700 case WLAN_SP_MESH_PEERING_CONFIRM: 701 if (!mesh_plink_free_count(sdata) || 702 (sta->llid != llid || sta->plid != plid)) 703 event = CNF_IGNR; 704 else 705 event = CNF_ACPT; 706 break; 707 case WLAN_SP_MESH_PEERING_CLOSE: 708 if (sta->plink_state == NL80211_PLINK_ESTAB) 709 /* Do not check for llid or plid. This does not 710 * follow the standard but since multiple plinks 711 * per sta are not supported, it is necessary in 712 * order to avoid a livelock when MP A sees an 713 * establish peer link to MP B but MP B does not 714 * see it. This can be caused by a timeout in 715 * B's peer link establishment or B beign 716 * restarted. 717 */ 718 event = CLS_ACPT; 719 else if (sta->plid != plid) 720 event = CLS_IGNR; 721 else if (ie_len == 7 && sta->llid != llid) 722 event = CLS_IGNR; 723 else 724 event = CLS_ACPT; 725 break; 726 default: 727 mpl_dbg("Mesh plink: unknown frame subtype\n"); 728 rcu_read_unlock(); 729 return; 730 } 731 } 732 733 if (event == OPN_ACPT) { 734 /* allocate sta entry if necessary and update info */ 735 sta = mesh_peer_init(sdata, mgmt->sa, &elems); 736 if (!sta) { 737 mpl_dbg("Mesh plink: failed to init peer!\n"); 738 rcu_read_unlock(); 739 return; 740 } 741 } 742 743 mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n", 744 mgmt->sa, mplstates[sta->plink_state], 745 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), 746 event); 747 reason = 0; 748 spin_lock_bh(&sta->lock); 749 switch (sta->plink_state) { 750 /* spin_unlock as soon as state is updated at each case */ 751 case NL80211_PLINK_LISTEN: 752 switch (event) { 753 case CLS_ACPT: 754 mesh_plink_fsm_restart(sta); 755 spin_unlock_bh(&sta->lock); 756 break; 757 case OPN_ACPT: 758 sta->plink_state = NL80211_PLINK_OPN_RCVD; 759 sta->plid = plid; 760 get_random_bytes(&llid, 2); 761 sta->llid = llid; 762 mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); 763 spin_unlock_bh(&sta->lock); 764 mesh_plink_frame_tx(sdata, 765 WLAN_SP_MESH_PEERING_OPEN, 766 sta->sta.addr, llid, 0, 0); 767 mesh_plink_frame_tx(sdata, 768 WLAN_SP_MESH_PEERING_CONFIRM, 769 sta->sta.addr, llid, plid, 0); 770 break; 771 default: 772 spin_unlock_bh(&sta->lock); 773 break; 774 } 775 break; 776 777 case NL80211_PLINK_OPN_SNT: 778 switch (event) { 779 case OPN_RJCT: 780 case CNF_RJCT: 781 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 782 case CLS_ACPT: 783 if (!reason) 784 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 785 sta->reason = reason; 786 sta->plink_state = NL80211_PLINK_HOLDING; 787 if (!mod_plink_timer(sta, 788 dot11MeshHoldingTimeout(sdata))) 789 sta->ignore_plink_timer = true; 790 791 llid = sta->llid; 792 spin_unlock_bh(&sta->lock); 793 mesh_plink_frame_tx(sdata, 794 WLAN_SP_MESH_PEERING_CLOSE, 795 sta->sta.addr, llid, plid, reason); 796 break; 797 case OPN_ACPT: 798 /* retry timer is left untouched */ 799 sta->plink_state = NL80211_PLINK_OPN_RCVD; 800 sta->plid = plid; 801 llid = sta->llid; 802 spin_unlock_bh(&sta->lock); 803 mesh_plink_frame_tx(sdata, 804 WLAN_SP_MESH_PEERING_CONFIRM, 805 sta->sta.addr, llid, plid, 0); 806 break; 807 case CNF_ACPT: 808 sta->plink_state = NL80211_PLINK_CNF_RCVD; 809 if (!mod_plink_timer(sta, 810 dot11MeshConfirmTimeout(sdata))) 811 sta->ignore_plink_timer = true; 812 813 spin_unlock_bh(&sta->lock); 814 break; 815 default: 816 spin_unlock_bh(&sta->lock); 817 break; 818 } 819 break; 820 821 case NL80211_PLINK_OPN_RCVD: 822 switch (event) { 823 case OPN_RJCT: 824 case CNF_RJCT: 825 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 826 case CLS_ACPT: 827 if (!reason) 828 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 829 sta->reason = reason; 830 sta->plink_state = NL80211_PLINK_HOLDING; 831 if (!mod_plink_timer(sta, 832 dot11MeshHoldingTimeout(sdata))) 833 sta->ignore_plink_timer = true; 834 835 llid = sta->llid; 836 spin_unlock_bh(&sta->lock); 837 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 838 sta->sta.addr, llid, plid, reason); 839 break; 840 case OPN_ACPT: 841 llid = sta->llid; 842 spin_unlock_bh(&sta->lock); 843 mesh_plink_frame_tx(sdata, 844 WLAN_SP_MESH_PEERING_CONFIRM, 845 sta->sta.addr, llid, plid, 0); 846 break; 847 case CNF_ACPT: 848 del_timer(&sta->plink_timer); 849 sta->plink_state = NL80211_PLINK_ESTAB; 850 spin_unlock_bh(&sta->lock); 851 mesh_plink_inc_estab_count(sdata); 852 changed |= mesh_set_ht_prot_mode(sdata); 853 changed |= BSS_CHANGED_BEACON; 854 mpl_dbg("Mesh plink with %pM ESTABLISHED\n", 855 sta->sta.addr); 856 break; 857 default: 858 spin_unlock_bh(&sta->lock); 859 break; 860 } 861 break; 862 863 case NL80211_PLINK_CNF_RCVD: 864 switch (event) { 865 case OPN_RJCT: 866 case CNF_RJCT: 867 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 868 case CLS_ACPT: 869 if (!reason) 870 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 871 sta->reason = reason; 872 sta->plink_state = NL80211_PLINK_HOLDING; 873 if (!mod_plink_timer(sta, 874 dot11MeshHoldingTimeout(sdata))) 875 sta->ignore_plink_timer = true; 876 877 llid = sta->llid; 878 spin_unlock_bh(&sta->lock); 879 mesh_plink_frame_tx(sdata, 880 WLAN_SP_MESH_PEERING_CLOSE, 881 sta->sta.addr, llid, plid, reason); 882 break; 883 case OPN_ACPT: 884 del_timer(&sta->plink_timer); 885 sta->plink_state = NL80211_PLINK_ESTAB; 886 spin_unlock_bh(&sta->lock); 887 mesh_plink_inc_estab_count(sdata); 888 changed |= mesh_set_ht_prot_mode(sdata); 889 changed |= BSS_CHANGED_BEACON; 890 mpl_dbg("Mesh plink with %pM ESTABLISHED\n", 891 sta->sta.addr); 892 mesh_plink_frame_tx(sdata, 893 WLAN_SP_MESH_PEERING_CONFIRM, 894 sta->sta.addr, llid, plid, 0); 895 break; 896 default: 897 spin_unlock_bh(&sta->lock); 898 break; 899 } 900 break; 901 902 case NL80211_PLINK_ESTAB: 903 switch (event) { 904 case CLS_ACPT: 905 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 906 sta->reason = reason; 907 __mesh_plink_deactivate(sta); 908 sta->plink_state = NL80211_PLINK_HOLDING; 909 llid = sta->llid; 910 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); 911 spin_unlock_bh(&sta->lock); 912 changed |= mesh_set_ht_prot_mode(sdata); 913 changed |= BSS_CHANGED_BEACON; 914 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 915 sta->sta.addr, llid, plid, reason); 916 break; 917 case OPN_ACPT: 918 llid = sta->llid; 919 spin_unlock_bh(&sta->lock); 920 mesh_plink_frame_tx(sdata, 921 WLAN_SP_MESH_PEERING_CONFIRM, 922 sta->sta.addr, llid, plid, 0); 923 break; 924 default: 925 spin_unlock_bh(&sta->lock); 926 break; 927 } 928 break; 929 case NL80211_PLINK_HOLDING: 930 switch (event) { 931 case CLS_ACPT: 932 if (del_timer(&sta->plink_timer)) 933 sta->ignore_plink_timer = 1; 934 mesh_plink_fsm_restart(sta); 935 spin_unlock_bh(&sta->lock); 936 break; 937 case OPN_ACPT: 938 case CNF_ACPT: 939 case OPN_RJCT: 940 case CNF_RJCT: 941 llid = sta->llid; 942 reason = sta->reason; 943 spin_unlock_bh(&sta->lock); 944 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 945 sta->sta.addr, llid, plid, reason); 946 break; 947 default: 948 spin_unlock_bh(&sta->lock); 949 } 950 break; 951 default: 952 /* should not get here, PLINK_BLOCKED is dealt with at the 953 * beginning of the function 954 */ 955 spin_unlock_bh(&sta->lock); 956 break; 957 } 958 959 rcu_read_unlock(); 960 961 if (changed) 962 ieee80211_bss_info_change_notify(sdata, changed); 963 } 964