mesh_plink.c revision f5c5681424299add910aad86b01d6ffe7ca02c84
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 40enum 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 52static 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 56static inline 57void 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 63static inline 64void 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 */ 77static 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 */ 87static 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/** mesh_set_ht_prot_mode - set correct HT protection mode 109 * 110 * Section 9.23.3.5 of IEEE 80211s standard describes the protection rules for 111 * HT mesh STA in a MBSS. Three HT protection modes are supported for now, 112 * non-HT mixed mode, 20MHz-protection and no-protection mode. non-HT mixed 113 * mode is selected if any non-HT peers are present in our MBSS. 114 * 20MHz-protection mode is selected if all peers in our 20/40MHz MBSS support 115 * HT and atleast one HT20 peer is present. Otherwise no-protection mode is 116 * selected. 117 */ 118static 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 switch (sta->ch_type) { 134 case NL80211_CHAN_NO_HT: 135 mpl_dbg("mesh_plink %pM: nonHT sta (%pM) is present", 136 sdata->vif.addr, sta->sta.addr); 137 non_ht_sta = true; 138 goto out; 139 case NL80211_CHAN_HT20: 140 mpl_dbg("mesh_plink %pM: HT20 sta (%pM) is present", 141 sdata->vif.addr, sta->sta.addr); 142 ht20_sta = true; 143 default: 144 break; 145 } 146 } 147 } 148out: 149 rcu_read_unlock(); 150 151 if (non_ht_sta) 152 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED; 153 else if (ht20_sta && local->_oper_channel_type > NL80211_CHAN_HT20) 154 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ; 155 else 156 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE; 157 158 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { 159 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 160 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode; 161 changed = BSS_CHANGED_HT; 162 mpl_dbg("mesh_plink %pM: protection mode changed to %d", 163 sdata->vif.addr, ht_opmode); 164 } 165 166 return changed; 167} 168 169/** 170 * __mesh_plink_deactivate - deactivate mesh peer link 171 * 172 * @sta: mesh peer link to deactivate 173 * 174 * All mesh paths with this peer as next hop will be flushed 175 * 176 * Locking: the caller must hold sta->lock 177 */ 178static bool __mesh_plink_deactivate(struct sta_info *sta) 179{ 180 struct ieee80211_sub_if_data *sdata = sta->sdata; 181 bool deactivated = false; 182 183 if (sta->plink_state == NL80211_PLINK_ESTAB) { 184 mesh_plink_dec_estab_count(sdata); 185 deactivated = true; 186 } 187 sta->plink_state = NL80211_PLINK_BLOCKED; 188 mesh_path_flush_by_nexthop(sta); 189 190 return deactivated; 191} 192 193/** 194 * mesh_plink_deactivate - deactivate mesh peer link 195 * 196 * @sta: mesh peer link to deactivate 197 * 198 * All mesh paths with this peer as next hop will be flushed 199 */ 200void mesh_plink_deactivate(struct sta_info *sta) 201{ 202 struct ieee80211_sub_if_data *sdata = sta->sdata; 203 bool deactivated; 204 205 spin_lock_bh(&sta->lock); 206 deactivated = __mesh_plink_deactivate(sta); 207 sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED); 208 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 209 sta->sta.addr, sta->llid, sta->plid, 210 sta->reason); 211 spin_unlock_bh(&sta->lock); 212 213 if (deactivated) 214 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); 215} 216 217static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, 218 enum ieee80211_self_protected_actioncode action, 219 u8 *da, __le16 llid, __le16 plid, __le16 reason) { 220 struct ieee80211_local *local = sdata->local; 221 struct sk_buff *skb; 222 struct ieee80211_mgmt *mgmt; 223 bool include_plid = false; 224 u16 peering_proto = 0; 225 u8 *pos, ie_len = 4; 226 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + 227 sizeof(mgmt->u.action.u.self_prot); 228 229 skb = dev_alloc_skb(local->tx_headroom + 230 hdr_len + 231 2 + /* capability info */ 232 2 + /* AID */ 233 2 + 8 + /* supported rates */ 234 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 235 2 + sdata->u.mesh.mesh_id_len + 236 2 + sizeof(struct ieee80211_meshconf_ie) + 237 2 + sizeof(struct ieee80211_ht_cap) + 238 2 + sizeof(struct ieee80211_ht_operation) + 239 2 + 8 + /* peering IE */ 240 sdata->u.mesh.ie_len); 241 if (!skb) 242 return -1; 243 skb_reserve(skb, local->tx_headroom); 244 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 245 memset(mgmt, 0, hdr_len); 246 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 247 IEEE80211_STYPE_ACTION); 248 memcpy(mgmt->da, da, ETH_ALEN); 249 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 250 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 251 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; 252 mgmt->u.action.u.self_prot.action_code = action; 253 254 if (action != WLAN_SP_MESH_PEERING_CLOSE) { 255 /* capability info */ 256 pos = skb_put(skb, 2); 257 memset(pos, 0, 2); 258 if (action == WLAN_SP_MESH_PEERING_CONFIRM) { 259 /* AID */ 260 pos = skb_put(skb, 2); 261 memcpy(pos + 2, &plid, 2); 262 } 263 if (ieee80211_add_srates_ie(&sdata->vif, skb, true) || 264 ieee80211_add_ext_srates_ie(&sdata->vif, skb, true) || 265 mesh_add_rsn_ie(skb, sdata) || 266 mesh_add_meshid_ie(skb, sdata) || 267 mesh_add_meshconf_ie(skb, sdata)) 268 return -1; 269 } else { /* WLAN_SP_MESH_PEERING_CLOSE */ 270 if (mesh_add_meshid_ie(skb, sdata)) 271 return -1; 272 } 273 274 /* Add Mesh Peering Management element */ 275 switch (action) { 276 case WLAN_SP_MESH_PEERING_OPEN: 277 break; 278 case WLAN_SP_MESH_PEERING_CONFIRM: 279 ie_len += 2; 280 include_plid = true; 281 break; 282 case WLAN_SP_MESH_PEERING_CLOSE: 283 if (plid) { 284 ie_len += 2; 285 include_plid = true; 286 } 287 ie_len += 2; /* reason code */ 288 break; 289 default: 290 return -EINVAL; 291 } 292 293 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) 294 return -ENOMEM; 295 296 pos = skb_put(skb, 2 + ie_len); 297 *pos++ = WLAN_EID_PEER_MGMT; 298 *pos++ = ie_len; 299 memcpy(pos, &peering_proto, 2); 300 pos += 2; 301 memcpy(pos, &llid, 2); 302 pos += 2; 303 if (include_plid) { 304 memcpy(pos, &plid, 2); 305 pos += 2; 306 } 307 if (action == WLAN_SP_MESH_PEERING_CLOSE) { 308 memcpy(pos, &reason, 2); 309 pos += 2; 310 } 311 312 if (action != WLAN_SP_MESH_PEERING_CLOSE) { 313 if (mesh_add_ht_cap_ie(skb, sdata) || 314 mesh_add_ht_oper_ie(skb, sdata)) 315 return -1; 316 } 317 318 if (mesh_add_vendor_ies(skb, sdata)) 319 return -1; 320 321 ieee80211_tx_skb(sdata, skb); 322 return 0; 323} 324 325/* mesh_peer_init - initialize new mesh peer and return resulting sta_info 326 * 327 * @sdata: local meshif 328 * @addr: peer's address 329 * @elems: IEs from beacon or mesh peering frame 330 * 331 * call under RCU 332 */ 333static struct sta_info *mesh_peer_init(struct ieee80211_sub_if_data *sdata, 334 u8 *addr, 335 struct ieee802_11_elems *elems) 336{ 337 struct ieee80211_local *local = sdata->local; 338 enum ieee80211_band band = local->oper_channel->band; 339 struct ieee80211_supported_band *sband; 340 u32 rates, basic_rates = 0; 341 struct sta_info *sta; 342 bool insert = false; 343 344 sband = local->hw.wiphy->bands[band]; 345 rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates); 346 347 sta = sta_info_get(sdata, addr); 348 if (!sta) { 349 /* Userspace handles peer allocation when security is enabled */ 350 if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) { 351 cfg80211_notify_new_peer_candidate(sdata->dev, addr, 352 elems->ie_start, 353 elems->total_len, 354 GFP_ATOMIC); 355 return NULL; 356 } 357 358 sta = mesh_plink_alloc(sdata, addr); 359 if (!sta) 360 return NULL; 361 insert = true; 362 } 363 364 spin_lock_bh(&sta->lock); 365 sta->last_rx = jiffies; 366 sta->sta.supp_rates[band] = rates; 367 if (elems->ht_cap_elem && 368 sdata->local->_oper_channel_type != NL80211_CHAN_NO_HT) 369 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 370 elems->ht_cap_elem, 371 &sta->sta.ht_cap); 372 else 373 memset(&sta->sta.ht_cap, 0, sizeof(sta->sta.ht_cap)); 374 375 if (elems->ht_operation) { 376 if (!(elems->ht_operation->ht_param & 377 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) 378 sta->sta.ht_cap.cap &= 379 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 380 sta->ch_type = 381 ieee80211_ht_oper_to_channel_type(elems->ht_operation); 382 } 383 384 rate_control_rate_init(sta); 385 spin_unlock_bh(&sta->lock); 386 387 if (insert && sta_info_insert(sta)) 388 return NULL; 389 390 return sta; 391} 392 393void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, 394 u8 *hw_addr, 395 struct ieee802_11_elems *elems) 396{ 397 struct sta_info *sta; 398 399 rcu_read_lock(); 400 sta = mesh_peer_init(sdata, hw_addr, elems); 401 if (!sta) 402 goto out; 403 404 if (mesh_peer_accepts_plinks(elems) && 405 sta->plink_state == NL80211_PLINK_LISTEN && 406 sdata->u.mesh.accepting_plinks && 407 sdata->u.mesh.mshcfg.auto_open_plinks && 408 rssi_threshold_check(sta, sdata)) 409 mesh_plink_open(sta); 410 411out: 412 rcu_read_unlock(); 413} 414 415static void mesh_plink_timer(unsigned long data) 416{ 417 struct sta_info *sta; 418 __le16 llid, plid, reason; 419 struct ieee80211_sub_if_data *sdata; 420 421 /* 422 * This STA is valid because sta_info_destroy() will 423 * del_timer_sync() this timer after having made sure 424 * it cannot be readded (by deleting the plink.) 425 */ 426 sta = (struct sta_info *) data; 427 428 if (sta->sdata->local->quiescing) { 429 sta->plink_timer_was_running = true; 430 return; 431 } 432 433 spin_lock_bh(&sta->lock); 434 if (sta->ignore_plink_timer) { 435 sta->ignore_plink_timer = false; 436 spin_unlock_bh(&sta->lock); 437 return; 438 } 439 mpl_dbg("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("Mesh plink for %pM (retry, timeout): %d %d\n", 453 sta->sta.addr, sta->plink_retries, 454 sta->plink_timeout); 455 get_random_bytes(&rand, sizeof(u32)); 456 sta->plink_timeout = sta->plink_timeout + 457 rand % sta->plink_timeout; 458 ++sta->plink_retries; 459 mod_plink_timer(sta, sta->plink_timeout); 460 spin_unlock_bh(&sta->lock); 461 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, 462 sta->sta.addr, llid, 0, 0); 463 break; 464 } 465 reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES); 466 /* fall through on else */ 467 case NL80211_PLINK_CNF_RCVD: 468 /* confirm timer */ 469 if (!reason) 470 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT); 471 sta->plink_state = NL80211_PLINK_HOLDING; 472 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); 473 spin_unlock_bh(&sta->lock); 474 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 475 sta->sta.addr, llid, plid, reason); 476 break; 477 case NL80211_PLINK_HOLDING: 478 /* holding timer */ 479 del_timer(&sta->plink_timer); 480 mesh_plink_fsm_restart(sta); 481 spin_unlock_bh(&sta->lock); 482 break; 483 default: 484 spin_unlock_bh(&sta->lock); 485 break; 486 } 487} 488 489#ifdef CONFIG_PM 490void mesh_plink_quiesce(struct sta_info *sta) 491{ 492 if (del_timer_sync(&sta->plink_timer)) 493 sta->plink_timer_was_running = true; 494} 495 496void mesh_plink_restart(struct sta_info *sta) 497{ 498 if (sta->plink_timer_was_running) { 499 add_timer(&sta->plink_timer); 500 sta->plink_timer_was_running = false; 501 } 502} 503#endif 504 505static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) 506{ 507 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); 508 sta->plink_timer.data = (unsigned long) sta; 509 sta->plink_timer.function = mesh_plink_timer; 510 sta->plink_timeout = timeout; 511 add_timer(&sta->plink_timer); 512} 513 514int mesh_plink_open(struct sta_info *sta) 515{ 516 __le16 llid; 517 struct ieee80211_sub_if_data *sdata = sta->sdata; 518 519 if (!test_sta_flag(sta, WLAN_STA_AUTH)) 520 return -EPERM; 521 522 spin_lock_bh(&sta->lock); 523 get_random_bytes(&llid, 2); 524 sta->llid = llid; 525 if (sta->plink_state != NL80211_PLINK_LISTEN) { 526 spin_unlock_bh(&sta->lock); 527 return -EBUSY; 528 } 529 sta->plink_state = NL80211_PLINK_OPN_SNT; 530 mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); 531 spin_unlock_bh(&sta->lock); 532 mpl_dbg("Mesh plink: starting establishment with %pM\n", 533 sta->sta.addr); 534 535 return mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN, 536 sta->sta.addr, llid, 0, 0); 537} 538 539void mesh_plink_block(struct sta_info *sta) 540{ 541 struct ieee80211_sub_if_data *sdata = sta->sdata; 542 bool deactivated; 543 544 spin_lock_bh(&sta->lock); 545 deactivated = __mesh_plink_deactivate(sta); 546 sta->plink_state = NL80211_PLINK_BLOCKED; 547 spin_unlock_bh(&sta->lock); 548 549 if (deactivated) 550 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); 551} 552 553 554void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, 555 size_t len, struct ieee80211_rx_status *rx_status) 556{ 557 struct ieee802_11_elems elems; 558 struct sta_info *sta; 559 enum plink_event event; 560 enum ieee80211_self_protected_actioncode ftype; 561 size_t baselen; 562 bool matches_local = true; 563 u8 ie_len; 564 u8 *baseaddr; 565 u32 changed = 0; 566 __le16 plid, llid, reason; 567#ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG 568 static const char *mplstates[] = { 569 [NL80211_PLINK_LISTEN] = "LISTEN", 570 [NL80211_PLINK_OPN_SNT] = "OPN-SNT", 571 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD", 572 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD", 573 [NL80211_PLINK_ESTAB] = "ESTAB", 574 [NL80211_PLINK_HOLDING] = "HOLDING", 575 [NL80211_PLINK_BLOCKED] = "BLOCKED" 576 }; 577#endif 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("Mesh plink: ignore frame from multicast address"); 585 return; 586 } 587 588 baseaddr = mgmt->u.action.u.self_prot.variable; 589 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; 590 if (mgmt->u.action.u.self_prot.action_code == 591 WLAN_SP_MESH_PEERING_CONFIRM) { 592 baseaddr += 4; 593 baselen += 4; 594 } 595 ieee802_11_parse_elems(baseaddr, len - baselen, &elems); 596 if (!elems.peering) { 597 mpl_dbg("Mesh plink: missing necessary peer link ie\n"); 598 return; 599 } 600 if (elems.rsn_len && 601 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { 602 mpl_dbg("Mesh plink: can't establish link with secure peer\n"); 603 return; 604 } 605 606 ftype = mgmt->u.action.u.self_prot.action_code; 607 ie_len = elems.peering_len; 608 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || 609 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || 610 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 611 && ie_len != 8)) { 612 mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n", 613 ftype, ie_len); 614 return; 615 } 616 617 if (ftype != WLAN_SP_MESH_PEERING_CLOSE && 618 (!elems.mesh_id || !elems.mesh_config)) { 619 mpl_dbg("Mesh plink: missing necessary ie\n"); 620 return; 621 } 622 /* Note the lines below are correct, the llid in the frame is the plid 623 * from the point of view of this host. 624 */ 625 memcpy(&plid, PLINK_GET_LLID(elems.peering), 2); 626 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || 627 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) 628 memcpy(&llid, PLINK_GET_PLID(elems.peering), 2); 629 630 rcu_read_lock(); 631 632 sta = sta_info_get(sdata, mgmt->sa); 633 if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) { 634 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); 635 rcu_read_unlock(); 636 return; 637 } 638 639 if (ftype == WLAN_SP_MESH_PEERING_OPEN && 640 !rssi_threshold_check(sta, sdata)) { 641 mpl_dbg("Mesh plink: %pM does not meet rssi threshold\n", 642 mgmt->sa); 643 rcu_read_unlock(); 644 return; 645 } 646 647 if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) { 648 mpl_dbg("Mesh plink: Action frame from non-authed peer\n"); 649 rcu_read_unlock(); 650 return; 651 } 652 653 if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) { 654 rcu_read_unlock(); 655 return; 656 } 657 658 /* Now we will figure out the appropriate event... */ 659 event = PLINK_UNDEFINED; 660 if (ftype != WLAN_SP_MESH_PEERING_CLOSE && 661 !mesh_matches_local(sdata, &elems)) { 662 matches_local = false; 663 switch (ftype) { 664 case WLAN_SP_MESH_PEERING_OPEN: 665 event = OPN_RJCT; 666 break; 667 case WLAN_SP_MESH_PEERING_CONFIRM: 668 event = CNF_RJCT; 669 break; 670 default: 671 break; 672 } 673 } 674 675 if (!sta && !matches_local) { 676 rcu_read_unlock(); 677 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 678 llid = 0; 679 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 680 mgmt->sa, llid, plid, reason); 681 return; 682 } else if (!sta) { 683 /* ftype == WLAN_SP_MESH_PEERING_OPEN */ 684 if (!mesh_plink_free_count(sdata)) { 685 mpl_dbg("Mesh plink error: no more free plinks\n"); 686 rcu_read_unlock(); 687 return; 688 } 689 event = OPN_ACPT; 690 } else if (matches_local) { 691 switch (ftype) { 692 case WLAN_SP_MESH_PEERING_OPEN: 693 if (!mesh_plink_free_count(sdata) || 694 (sta->plid && sta->plid != plid)) 695 event = OPN_IGNR; 696 else 697 event = OPN_ACPT; 698 break; 699 case WLAN_SP_MESH_PEERING_CONFIRM: 700 if (!mesh_plink_free_count(sdata) || 701 (sta->llid != llid || sta->plid != plid)) 702 event = CNF_IGNR; 703 else 704 event = CNF_ACPT; 705 break; 706 case WLAN_SP_MESH_PEERING_CLOSE: 707 if (sta->plink_state == NL80211_PLINK_ESTAB) 708 /* Do not check for llid or plid. This does not 709 * follow the standard but since multiple plinks 710 * per sta are not supported, it is necessary in 711 * order to avoid a livelock when MP A sees an 712 * establish peer link to MP B but MP B does not 713 * see it. This can be caused by a timeout in 714 * B's peer link establishment or B beign 715 * restarted. 716 */ 717 event = CLS_ACPT; 718 else if (sta->plid != plid) 719 event = CLS_IGNR; 720 else if (ie_len == 7 && sta->llid != llid) 721 event = CLS_IGNR; 722 else 723 event = CLS_ACPT; 724 break; 725 default: 726 mpl_dbg("Mesh plink: unknown frame subtype\n"); 727 rcu_read_unlock(); 728 return; 729 } 730 } 731 732 if (event == OPN_ACPT) { 733 /* allocate sta entry if necessary and update info */ 734 sta = mesh_peer_init(sdata, mgmt->sa, &elems); 735 if (!sta) { 736 mpl_dbg("Mesh plink: failed to init peer!\n"); 737 rcu_read_unlock(); 738 return; 739 } 740 } 741 742 mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n", 743 mgmt->sa, mplstates[sta->plink_state], 744 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), 745 event); 746 reason = 0; 747 spin_lock_bh(&sta->lock); 748 switch (sta->plink_state) { 749 /* spin_unlock as soon as state is updated at each case */ 750 case NL80211_PLINK_LISTEN: 751 switch (event) { 752 case CLS_ACPT: 753 mesh_plink_fsm_restart(sta); 754 spin_unlock_bh(&sta->lock); 755 break; 756 case OPN_ACPT: 757 sta->plink_state = NL80211_PLINK_OPN_RCVD; 758 sta->plid = plid; 759 get_random_bytes(&llid, 2); 760 sta->llid = llid; 761 mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); 762 spin_unlock_bh(&sta->lock); 763 mesh_plink_frame_tx(sdata, 764 WLAN_SP_MESH_PEERING_OPEN, 765 sta->sta.addr, llid, 0, 0); 766 mesh_plink_frame_tx(sdata, 767 WLAN_SP_MESH_PEERING_CONFIRM, 768 sta->sta.addr, llid, plid, 0); 769 break; 770 default: 771 spin_unlock_bh(&sta->lock); 772 break; 773 } 774 break; 775 776 case NL80211_PLINK_OPN_SNT: 777 switch (event) { 778 case OPN_RJCT: 779 case CNF_RJCT: 780 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 781 case CLS_ACPT: 782 if (!reason) 783 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 784 sta->reason = reason; 785 sta->plink_state = NL80211_PLINK_HOLDING; 786 if (!mod_plink_timer(sta, 787 dot11MeshHoldingTimeout(sdata))) 788 sta->ignore_plink_timer = true; 789 790 llid = sta->llid; 791 spin_unlock_bh(&sta->lock); 792 mesh_plink_frame_tx(sdata, 793 WLAN_SP_MESH_PEERING_CLOSE, 794 sta->sta.addr, llid, plid, reason); 795 break; 796 case OPN_ACPT: 797 /* retry timer is left untouched */ 798 sta->plink_state = NL80211_PLINK_OPN_RCVD; 799 sta->plid = plid; 800 llid = sta->llid; 801 spin_unlock_bh(&sta->lock); 802 mesh_plink_frame_tx(sdata, 803 WLAN_SP_MESH_PEERING_CONFIRM, 804 sta->sta.addr, llid, plid, 0); 805 break; 806 case CNF_ACPT: 807 sta->plink_state = NL80211_PLINK_CNF_RCVD; 808 if (!mod_plink_timer(sta, 809 dot11MeshConfirmTimeout(sdata))) 810 sta->ignore_plink_timer = true; 811 812 spin_unlock_bh(&sta->lock); 813 break; 814 default: 815 spin_unlock_bh(&sta->lock); 816 break; 817 } 818 break; 819 820 case NL80211_PLINK_OPN_RCVD: 821 switch (event) { 822 case OPN_RJCT: 823 case CNF_RJCT: 824 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 825 case CLS_ACPT: 826 if (!reason) 827 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 828 sta->reason = reason; 829 sta->plink_state = NL80211_PLINK_HOLDING; 830 if (!mod_plink_timer(sta, 831 dot11MeshHoldingTimeout(sdata))) 832 sta->ignore_plink_timer = true; 833 834 llid = sta->llid; 835 spin_unlock_bh(&sta->lock); 836 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 837 sta->sta.addr, llid, plid, reason); 838 break; 839 case OPN_ACPT: 840 llid = sta->llid; 841 spin_unlock_bh(&sta->lock); 842 mesh_plink_frame_tx(sdata, 843 WLAN_SP_MESH_PEERING_CONFIRM, 844 sta->sta.addr, llid, plid, 0); 845 break; 846 case CNF_ACPT: 847 del_timer(&sta->plink_timer); 848 sta->plink_state = NL80211_PLINK_ESTAB; 849 spin_unlock_bh(&sta->lock); 850 mesh_plink_inc_estab_count(sdata); 851 changed |= mesh_set_ht_prot_mode(sdata); 852 changed |= BSS_CHANGED_BEACON; 853 mpl_dbg("Mesh plink with %pM ESTABLISHED\n", 854 sta->sta.addr); 855 break; 856 default: 857 spin_unlock_bh(&sta->lock); 858 break; 859 } 860 break; 861 862 case NL80211_PLINK_CNF_RCVD: 863 switch (event) { 864 case OPN_RJCT: 865 case CNF_RJCT: 866 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG); 867 case CLS_ACPT: 868 if (!reason) 869 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 870 sta->reason = reason; 871 sta->plink_state = NL80211_PLINK_HOLDING; 872 if (!mod_plink_timer(sta, 873 dot11MeshHoldingTimeout(sdata))) 874 sta->ignore_plink_timer = true; 875 876 llid = sta->llid; 877 spin_unlock_bh(&sta->lock); 878 mesh_plink_frame_tx(sdata, 879 WLAN_SP_MESH_PEERING_CLOSE, 880 sta->sta.addr, llid, plid, reason); 881 break; 882 case OPN_ACPT: 883 del_timer(&sta->plink_timer); 884 sta->plink_state = NL80211_PLINK_ESTAB; 885 spin_unlock_bh(&sta->lock); 886 mesh_plink_inc_estab_count(sdata); 887 changed |= mesh_set_ht_prot_mode(sdata); 888 changed |= BSS_CHANGED_BEACON; 889 mpl_dbg("Mesh plink with %pM ESTABLISHED\n", 890 sta->sta.addr); 891 mesh_plink_frame_tx(sdata, 892 WLAN_SP_MESH_PEERING_CONFIRM, 893 sta->sta.addr, llid, plid, 0); 894 break; 895 default: 896 spin_unlock_bh(&sta->lock); 897 break; 898 } 899 break; 900 901 case NL80211_PLINK_ESTAB: 902 switch (event) { 903 case CLS_ACPT: 904 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE); 905 sta->reason = reason; 906 __mesh_plink_deactivate(sta); 907 sta->plink_state = NL80211_PLINK_HOLDING; 908 llid = sta->llid; 909 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); 910 spin_unlock_bh(&sta->lock); 911 changed |= mesh_set_ht_prot_mode(sdata); 912 changed |= BSS_CHANGED_BEACON; 913 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 914 sta->sta.addr, llid, plid, reason); 915 break; 916 case OPN_ACPT: 917 llid = sta->llid; 918 spin_unlock_bh(&sta->lock); 919 mesh_plink_frame_tx(sdata, 920 WLAN_SP_MESH_PEERING_CONFIRM, 921 sta->sta.addr, llid, plid, 0); 922 break; 923 default: 924 spin_unlock_bh(&sta->lock); 925 break; 926 } 927 break; 928 case NL80211_PLINK_HOLDING: 929 switch (event) { 930 case CLS_ACPT: 931 if (del_timer(&sta->plink_timer)) 932 sta->ignore_plink_timer = 1; 933 mesh_plink_fsm_restart(sta); 934 spin_unlock_bh(&sta->lock); 935 break; 936 case OPN_ACPT: 937 case CNF_ACPT: 938 case OPN_RJCT: 939 case CNF_RJCT: 940 llid = sta->llid; 941 reason = sta->reason; 942 spin_unlock_bh(&sta->lock); 943 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, 944 sta->sta.addr, llid, plid, reason); 945 break; 946 default: 947 spin_unlock_bh(&sta->lock); 948 } 949 break; 950 default: 951 /* should not get here, PLINK_BLOCKED is dealt with at the 952 * beginning of the function 953 */ 954 spin_unlock_bh(&sta->lock); 955 break; 956 } 957 958 rcu_read_unlock(); 959 960 if (changed) 961 ieee80211_bss_info_change_notify(sdata, changed); 962} 963