net/mac80211/mesh_plink.c

   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 + 4)
  23 #define PLINK_GET_PLID(p) (p + 6)
  24
  25 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
  26                                 jiffies + HZ * t / 1000))
  27
  28 /* Peer link cancel reasons, all subject to ANA approval */
  29 #define MESH_LINK_CANCELLED                     2
  30 #define MESH_MAX_NEIGHBORS                      3
  31 #define MESH_CAPABILITY_POLICY_VIOLATION        4
  32 #define MESH_CLOSE_RCVD                         5
  33 #define MESH_MAX_RETRIES                        6
  34 #define MESH_CONFIRM_TIMEOUT                    7
  35 #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS  8
  36 #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9
  37 #define MESH_SECURITY_FAILED_VERIFICATION       10
  38
  39 #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries)
  40 #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout)
  41 #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout)
  42 #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout)
  43 #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks)
  44
  45 enum plink_frame_type {
  46         PLINK_OPEN = 0,
  47         PLINK_CONFIRM,
  48         PLINK_CLOSE
  49 };
  50
  51 enum plink_event {
  52         PLINK_UNDEFINED,
  53         OPN_ACPT,
  54         OPN_RJCT,
  55         OPN_IGNR,
  56         CNF_ACPT,
  57         CNF_RJCT,
  58         CNF_IGNR,
  59         CLS_ACPT,
  60         CLS_IGNR
  61 };
  62
  63 static inline
  64 void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
  65 {
  66         atomic_inc(&sdata->u.mesh.mshstats.estab_plinks);
  67         mesh_accept_plinks_update(sdata);
  68 }
  69
  70 static inline
  71 void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
  72 {
  73         atomic_dec(&sdata->u.mesh.mshstats.estab_plinks);
  74         mesh_accept_plinks_update(sdata);
  75 }
  76
  77 /**
  78  * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
  79  *
  80  * @sta: mesh peer link to restart
  81  *
  82  * Locking: this function must be called holding sta->lock
  83  */
  84 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
  85 {
  86         sta->plink_state = PLINK_LISTEN;
  87         sta->llid = sta->plid = sta->reason = 0;
  88         sta->plink_retries = 0;
  89 }
  90
  91 /*
  92  * NOTE: This is just an alias for sta_info_alloc(), see notes
  93  *       on it in the lifecycle management section!
  94  */
  95 static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
  96                                          u8 *hw_addr, u32 rates)
  97 {
  98         struct ieee80211_local *local = sdata->local;
  99         struct sta_info *sta;
 100
 101         if (local->num_sta >= MESH_MAX_PLINKS)
 102                 return NULL;
 103
 104         sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
 105         if (!sta)
 106                 return NULL;
 107
 108         sta->flags = WLAN_STA_AUTHORIZED;
 109         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
 110         rate_control_rate_init(sta);
 111
 112         return sta;
 113 }
 114
 115 /**
 116  * __mesh_plink_deactivate - deactivate mesh peer link
 117  *
 118  * @sta: mesh peer link to deactivate
 119  *
 120  * All mesh paths with this peer as next hop will be flushed
 121  *
 122  * Locking: the caller must hold sta->lock
 123  */
 124 static bool __mesh_plink_deactivate(struct sta_info *sta)
 125 {
 126         struct ieee80211_sub_if_data *sdata = sta->sdata;
 127         bool deactivated = false;
 128
 129         if (sta->plink_state == PLINK_ESTAB) {
 130                 mesh_plink_dec_estab_count(sdata);
 131                 deactivated = true;
 132         }
 133         sta->plink_state = PLINK_BLOCKED;
 134         mesh_path_flush_by_nexthop(sta);
 135
 136         return deactivated;
 137 }
 138
 139 /**
 140  * mesh_plink_deactivate - deactivate mesh peer link
 141  *
 142  * @sta: mesh peer link to deactivate
 143  *
 144  * All mesh paths with this peer as next hop will be flushed
 145  */
 146 void mesh_plink_deactivate(struct sta_info *sta)
 147 {
 148         struct ieee80211_sub_if_data *sdata = sta->sdata;
 149         bool deactivated;
 150
 151         spin_lock_bh(&sta->lock);
 152         deactivated = __mesh_plink_deactivate(sta);
 153         spin_unlock_bh(&sta->lock);
 154
 155         if (deactivated)
 156                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 157 }
 158
 159 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
 160                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
 161                 __le16 reason) {
 162         struct ieee80211_local *local = sdata->local;
 163         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 164         struct ieee80211_mgmt *mgmt;
 165         bool include_plid = false;
 166         static const u8 meshpeeringproto[] = { 0x00, 0x0F, 0xAC, 0x2A };
 167         u8 *pos;
 168         int ie_len;
 169
 170         if (!skb)
 171                 return -1;
 172         skb_reserve(skb, local->hw.extra_tx_headroom);
 173         /* 25 is the size of the common mgmt part (24) plus the size of the
 174          * common action part (1)
 175          */
 176         mgmt = (struct ieee80211_mgmt *)
 177                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
 178         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
 179         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 180                                           IEEE80211_STYPE_ACTION);
 181         memcpy(mgmt->da, da, ETH_ALEN);
 182         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 183         /* BSSID is left zeroed, wildcard value */
 184         mgmt->u.action.category = WLAN_CATEGORY_MESH_PLINK;
 185         mgmt->u.action.u.plink_action.action_code = action;
 186
 187         if (action == PLINK_CLOSE)
 188                 mgmt->u.action.u.plink_action.aux = reason;
 189         else {
 190                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
 191                 if (action == PLINK_CONFIRM) {
 192                         pos = skb_put(skb, 4);
 193                         /* two-byte status code followed by two-byte AID */
 194                         memset(pos, 0, 2);
 195                         memcpy(pos + 2, &plid, 2);
 196                 }
 197                 mesh_mgmt_ies_add(skb, sdata);
 198         }
 199
 200         /* Add Peer Link Management element */
 201         switch (action) {
 202         case PLINK_OPEN:
 203                 ie_len = 6;
 204                 break;
 205         case PLINK_CONFIRM:
 206                 ie_len = 8;
 207                 include_plid = true;
 208                 break;
 209         case PLINK_CLOSE:
 210         default:
 211                 if (!plid)
 212                         ie_len = 8;
 213                 else {
 214                         ie_len = 10;
 215                         include_plid = true;
 216                 }
 217                 break;
 218         }
 219
 220         pos = skb_put(skb, 2 + ie_len);
 221         *pos++ = WLAN_EID_PEER_LINK;
 222         *pos++ = ie_len;
 223         memcpy(pos, meshpeeringproto, sizeof(meshpeeringproto));
 224         pos += 4;
 225         memcpy(pos, &llid, 2);
 226         if (include_plid) {
 227                 pos += 2;
 228                 memcpy(pos, &plid, 2);
 229         }
 230         if (action == PLINK_CLOSE) {
 231                 pos += 2;
 232                 memcpy(pos, &reason, 2);
 233         }
 234
 235         ieee80211_tx_skb(sdata, skb);
 236         return 0;
 237 }
 238
 239 void mesh_neighbour_update(u8 *hw_addr, u32 rates, struct ieee80211_sub_if_data *sdata,
 240                            bool peer_accepting_plinks)
 241 {
 242         struct ieee80211_local *local = sdata->local;
 243         struct sta_info *sta;
 244
 245         rcu_read_lock();
 246
 247         sta = sta_info_get(sdata, hw_addr);
 248         if (!sta) {
 249                 rcu_read_unlock();
 250
 251                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
 252                 if (!sta)
 253                         return;
 254                 if (sta_info_insert_rcu(sta)) {
 255                         rcu_read_unlock();
 256                         return;
 257                 }
 258         }
 259
 260         sta->last_rx = jiffies;
 261         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
 262         if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN &&
 263                         sdata->u.mesh.accepting_plinks &&
 264                         sdata->u.mesh.mshcfg.auto_open_plinks)
 265                 mesh_plink_open(sta);
 266
 267         rcu_read_unlock();
 268 }
 269
 270 static void mesh_plink_timer(unsigned long data)
 271 {
 272         struct sta_info *sta;
 273         __le16 llid, plid, reason;
 274         struct ieee80211_sub_if_data *sdata;
 275
 276         /*
 277          * This STA is valid because sta_info_destroy() will
 278          * del_timer_sync() this timer after having made sure
 279          * it cannot be readded (by deleting the plink.)
 280          */
 281         sta = (struct sta_info *) data;
 282
 283         if (sta->sdata->local->quiescing) {
 284                 sta->plink_timer_was_running = true;
 285                 return;
 286         }
 287
 288         spin_lock_bh(&sta->lock);
 289         if (sta->ignore_plink_timer) {
 290                 sta->ignore_plink_timer = false;
 291                 spin_unlock_bh(&sta->lock);
 292                 return;
 293         }
 294         mpl_dbg("Mesh plink timer for %pM fired on state %d\n",
 295                 sta->sta.addr, sta->plink_state);
 296         reason = 0;
 297         llid = sta->llid;
 298         plid = sta->plid;
 299         sdata = sta->sdata;
 300
 301         switch (sta->plink_state) {
 302         case PLINK_OPN_RCVD:
 303         case PLINK_OPN_SNT:
 304                 /* retry timer */
 305                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
 306                         u32 rand;
 307                         mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n",
 308                                 sta->sta.addr, sta->plink_retries,
 309                                 sta->plink_timeout);
 310                         get_random_bytes(&rand, sizeof(u32));
 311                         sta->plink_timeout = sta->plink_timeout +
 312                                              rand % sta->plink_timeout;
 313                         ++sta->plink_retries;
 314                         mod_plink_timer(sta, sta->plink_timeout);
 315                         spin_unlock_bh(&sta->lock);
 316                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
 317                                             0, 0);
 318                         break;
 319                 }
 320                 reason = cpu_to_le16(MESH_MAX_RETRIES);
 321                 /* fall through on else */
 322         case PLINK_CNF_RCVD:
 323                 /* confirm timer */
 324                 if (!reason)
 325                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
 326                 sta->plink_state = PLINK_HOLDING;
 327                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 328                 spin_unlock_bh(&sta->lock);
 329                 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid,
 330                                     reason);
 331                 break;
 332         case PLINK_HOLDING:
 333                 /* holding timer */
 334                 del_timer(&sta->plink_timer);
 335                 mesh_plink_fsm_restart(sta);
 336                 spin_unlock_bh(&sta->lock);
 337                 break;
 338         default:
 339                 spin_unlock_bh(&sta->lock);
 340                 break;
 341         }
 342 }
 343
 344 #ifdef CONFIG_PM
 345 void mesh_plink_quiesce(struct sta_info *sta)
 346 {
 347         if (del_timer_sync(&sta->plink_timer))
 348                 sta->plink_timer_was_running = true;
 349 }
 350
 351 void mesh_plink_restart(struct sta_info *sta)
 352 {
 353         if (sta->plink_timer_was_running) {
 354                 add_timer(&sta->plink_timer);
 355                 sta->plink_timer_was_running = false;
 356         }
 357 }
 358 #endif
 359
 360 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
 361 {
 362         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
 363         sta->plink_timer.data = (unsigned long) sta;
 364         sta->plink_timer.function = mesh_plink_timer;
 365         sta->plink_timeout = timeout;
 366         add_timer(&sta->plink_timer);
 367 }
 368
 369 int mesh_plink_open(struct sta_info *sta)
 370 {
 371         __le16 llid;
 372         struct ieee80211_sub_if_data *sdata = sta->sdata;
 373
 374         spin_lock_bh(&sta->lock);
 375         get_random_bytes(&llid, 2);
 376         sta->llid = llid;
 377         if (sta->plink_state != PLINK_LISTEN) {
 378                 spin_unlock_bh(&sta->lock);
 379                 return -EBUSY;
 380         }
 381         sta->plink_state = PLINK_OPN_SNT;
 382         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 383         spin_unlock_bh(&sta->lock);
 384         mpl_dbg("Mesh plink: starting establishment with %pM\n",
 385                 sta->sta.addr);
 386
 387         return mesh_plink_frame_tx(sdata, PLINK_OPEN,
 388                                    sta->sta.addr, llid, 0, 0);
 389 }
 390
 391 void mesh_plink_block(struct sta_info *sta)
 392 {
 393         struct ieee80211_sub_if_data *sdata = sta->sdata;
 394         bool deactivated;
 395
 396         spin_lock_bh(&sta->lock);
 397         deactivated = __mesh_plink_deactivate(sta);
 398         sta->plink_state = PLINK_BLOCKED;
 399         spin_unlock_bh(&sta->lock);
 400
 401         if (deactivated)
 402                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 403 }
 404
 405
 406 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
 407                          size_t len, struct ieee80211_rx_status *rx_status)
 408 {
 409         struct ieee80211_local *local = sdata->local;
 410         struct ieee802_11_elems elems;
 411         struct sta_info *sta;
 412         enum plink_event event;
 413         enum plink_frame_type ftype;
 414         size_t baselen;
 415         bool deactivated, matches_local = true;
 416         u8 ie_len;
 417         u8 *baseaddr;
 418         __le16 plid, llid, reason;
 419 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 420         static const char *mplstates[] = {
 421                 [PLINK_LISTEN] = "LISTEN",
 422                 [PLINK_OPN_SNT] = "OPN-SNT",
 423                 [PLINK_OPN_RCVD] = "OPN-RCVD",
 424                 [PLINK_CNF_RCVD] = "CNF_RCVD",
 425                 [PLINK_ESTAB] = "ESTAB",
 426                 [PLINK_HOLDING] = "HOLDING",
 427                 [PLINK_BLOCKED] = "BLOCKED"
 428         };
 429 #endif
 430
 431         /* need action_code, aux */
 432         if (len < IEEE80211_MIN_ACTION_SIZE + 3)
 433                 return;
 434
 435         if (is_multicast_ether_addr(mgmt->da)) {
 436                 mpl_dbg("Mesh plink: ignore frame from multicast address");
 437                 return;
 438         }
 439
 440         baseaddr = mgmt->u.action.u.plink_action.variable;
 441         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
 442         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
 443                 baseaddr += 4;
 444                 baselen += 4;
 445         }
 446         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
 447         if (!elems.peer_link) {
 448                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
 449                 return;
 450         }
 451
 452         ftype = mgmt->u.action.u.plink_action.action_code;
 453         ie_len = elems.peer_link_len;
 454         if ((ftype == PLINK_OPEN && ie_len != 6) ||
 455             (ftype == PLINK_CONFIRM && ie_len != 8) ||
 456             (ftype == PLINK_CLOSE && ie_len != 8 && ie_len != 10)) {
 457                 mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n",
 458                     ftype, ie_len);
 459                 return;
 460         }
 461
 462         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
 463                 mpl_dbg("Mesh plink: missing necessary ie\n");
 464                 return;
 465         }
 466         /* Note the lines below are correct, the llid in the frame is the plid
 467          * from the point of view of this host.
 468          */
 469         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
 470         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 10))
 471                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
 472
 473         rcu_read_lock();
 474
 475         sta = sta_info_get(sdata, mgmt->sa);
 476         if (!sta && ftype != PLINK_OPEN) {
 477                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
 478                 rcu_read_unlock();
 479                 return;
 480         }
 481
 482         if (sta && sta->plink_state == PLINK_BLOCKED) {
 483                 rcu_read_unlock();
 484                 return;
 485         }
 486
 487         /* Now we will figure out the appropriate event... */
 488         event = PLINK_UNDEFINED;
 489         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) {
 490                 matches_local = false;
 491                 switch (ftype) {
 492                 case PLINK_OPEN:
 493                         event = OPN_RJCT;
 494                         break;
 495                 case PLINK_CONFIRM:
 496                         event = CNF_RJCT;
 497                         break;
 498                 case PLINK_CLOSE:
 499                         /* avoid warning */
 500                         break;
 501                 }
 502         }
 503
 504         if (!sta && !matches_local) {
 505                 rcu_read_unlock();
 506                 reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 507                 llid = 0;
 508                 mesh_plink_frame_tx(sdata, PLINK_CLOSE, mgmt->sa, llid,
 509                                     plid, reason);
 510                 return;
 511         } else if (!sta) {
 512                 /* ftype == PLINK_OPEN */
 513                 u32 rates;
 514
 515                 rcu_read_unlock();
 516
 517                 if (!mesh_plink_free_count(sdata)) {
 518                         mpl_dbg("Mesh plink error: no more free plinks\n");
 519                         return;
 520                 }
 521
 522                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
 523                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
 524                 if (!sta) {
 525                         mpl_dbg("Mesh plink error: plink table full\n");
 526                         return;
 527                 }
 528                 if (sta_info_insert_rcu(sta)) {
 529                         rcu_read_unlock();
 530                         return;
 531                 }
 532                 event = OPN_ACPT;
 533                 spin_lock_bh(&sta->lock);
 534         } else if (matches_local) {
 535                 spin_lock_bh(&sta->lock);
 536                 switch (ftype) {
 537                 case PLINK_OPEN:
 538                         if (!mesh_plink_free_count(sdata) ||
 539                             (sta->plid && sta->plid != plid))
 540                                 event = OPN_IGNR;
 541                         else
 542                                 event = OPN_ACPT;
 543                         break;
 544                 case PLINK_CONFIRM:
 545                         if (!mesh_plink_free_count(sdata) ||
 546                             (sta->llid != llid || sta->plid != plid))
 547                                 event = CNF_IGNR;
 548                         else
 549                                 event = CNF_ACPT;
 550                         break;
 551                 case PLINK_CLOSE:
 552                         if (sta->plink_state == PLINK_ESTAB)
 553                                 /* Do not check for llid or plid. This does not
 554                                  * follow the standard but since multiple plinks
 555                                  * per sta are not supported, it is necessary in
 556                                  * order to avoid a livelock when MP A sees an
 557                                  * establish peer link to MP B but MP B does not
 558                                  * see it. This can be caused by a timeout in
 559                                  * B's peer link establishment or B beign
 560                                  * restarted.
 561                                  */
 562                                 event = CLS_ACPT;
 563                         else if (sta->plid != plid)
 564                                 event = CLS_IGNR;
 565                         else if (ie_len == 7 && sta->llid != llid)
 566                                 event = CLS_IGNR;
 567                         else
 568                                 event = CLS_ACPT;
 569                         break;
 570                 default:
 571                         mpl_dbg("Mesh plink: unknown frame subtype\n");
 572                         spin_unlock_bh(&sta->lock);
 573                         rcu_read_unlock();
 574                         return;
 575                 }
 576         } else {
 577                 spin_lock_bh(&sta->lock);
 578         }
 579
 580         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
 581                 mgmt->sa, mplstates[sta->plink_state],
 582                 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
 583                 event);
 584         reason = 0;
 585         switch (sta->plink_state) {
 586                 /* spin_unlock as soon as state is updated at each case */
 587         case PLINK_LISTEN:
 588                 switch (event) {
 589                 case CLS_ACPT:
 590                         mesh_plink_fsm_restart(sta);
 591                         spin_unlock_bh(&sta->lock);
 592                         break;
 593                 case OPN_ACPT:
 594                         sta->plink_state = PLINK_OPN_RCVD;
 595                         sta->plid = plid;
 596                         get_random_bytes(&llid, 2);
 597                         sta->llid = llid;
 598                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 599                         spin_unlock_bh(&sta->lock);
 600                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
 601                                             0, 0);
 602                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr,
 603                                             llid, plid, 0);
 604                         break;
 605                 default:
 606                         spin_unlock_bh(&sta->lock);
 607                         break;
 608                 }
 609                 break;
 610
 611         case PLINK_OPN_SNT:
 612                 switch (event) {
 613                 case OPN_RJCT:
 614                 case CNF_RJCT:
 615                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 616                 case CLS_ACPT:
 617                         if (!reason)
 618                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 619                         sta->reason = reason;
 620                         sta->plink_state = PLINK_HOLDING;
 621                         if (!mod_plink_timer(sta,
 622                                              dot11MeshHoldingTimeout(sdata)))
 623                                 sta->ignore_plink_timer = true;
 624
 625                         llid = sta->llid;
 626                         spin_unlock_bh(&sta->lock);
 627                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 628                                             plid, reason);
 629                         break;
 630                 case OPN_ACPT:
 631                         /* retry timer is left untouched */
 632                         sta->plink_state = PLINK_OPN_RCVD;
 633                         sta->plid = plid;
 634                         llid = sta->llid;
 635                         spin_unlock_bh(&sta->lock);
 636                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 637                                             plid, 0);
 638                         break;
 639                 case CNF_ACPT:
 640                         sta->plink_state = PLINK_CNF_RCVD;
 641                         if (!mod_plink_timer(sta,
 642                                              dot11MeshConfirmTimeout(sdata)))
 643                                 sta->ignore_plink_timer = true;
 644
 645                         spin_unlock_bh(&sta->lock);
 646                         break;
 647                 default:
 648                         spin_unlock_bh(&sta->lock);
 649                         break;
 650                 }
 651                 break;
 652
 653         case PLINK_OPN_RCVD:
 654                 switch (event) {
 655                 case OPN_RJCT:
 656                 case CNF_RJCT:
 657                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 658                 case CLS_ACPT:
 659                         if (!reason)
 660                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 661                         sta->reason = reason;
 662                         sta->plink_state = PLINK_HOLDING;
 663                         if (!mod_plink_timer(sta,
 664                                              dot11MeshHoldingTimeout(sdata)))
 665                                 sta->ignore_plink_timer = true;
 666
 667                         llid = sta->llid;
 668                         spin_unlock_bh(&sta->lock);
 669                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 670                                             plid, reason);
 671                         break;
 672                 case OPN_ACPT:
 673                         llid = sta->llid;
 674                         spin_unlock_bh(&sta->lock);
 675                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 676                                             plid, 0);
 677                         break;
 678                 case CNF_ACPT:
 679                         del_timer(&sta->plink_timer);
 680                         sta->plink_state = PLINK_ESTAB;
 681                         spin_unlock_bh(&sta->lock);
 682                         mesh_plink_inc_estab_count(sdata);
 683                         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 684                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
 685                                 sta->sta.addr);
 686                         break;
 687                 default:
 688                         spin_unlock_bh(&sta->lock);
 689                         break;
 690                 }
 691                 break;
 692
 693         case PLINK_CNF_RCVD:
 694                 switch (event) {
 695                 case OPN_RJCT:
 696                 case CNF_RJCT:
 697                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 698                 case CLS_ACPT:
 699                         if (!reason)
 700                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 701                         sta->reason = reason;
 702                         sta->plink_state = PLINK_HOLDING;
 703                         if (!mod_plink_timer(sta,
 704                                              dot11MeshHoldingTimeout(sdata)))
 705                                 sta->ignore_plink_timer = true;
 706
 707                         llid = sta->llid;
 708                         spin_unlock_bh(&sta->lock);
 709                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 710                                             plid, reason);
 711                         break;
 712                 case OPN_ACPT:
 713                         del_timer(&sta->plink_timer);
 714                         sta->plink_state = PLINK_ESTAB;
 715                         spin_unlock_bh(&sta->lock);
 716                         mesh_plink_inc_estab_count(sdata);
 717                         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 718                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
 719                                 sta->sta.addr);
 720                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 721                                             plid, 0);
 722                         break;
 723                 default:
 724                         spin_unlock_bh(&sta->lock);
 725                         break;
 726                 }
 727                 break;
 728
 729         case PLINK_ESTAB:
 730                 switch (event) {
 731                 case CLS_ACPT:
 732                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
 733                         sta->reason = reason;
 734                         deactivated = __mesh_plink_deactivate(sta);
 735                         sta->plink_state = PLINK_HOLDING;
 736                         llid = sta->llid;
 737                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 738                         spin_unlock_bh(&sta->lock);
 739                         if (deactivated)
 740                                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 741                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 742                                             plid, reason);
 743                         break;
 744                 case OPN_ACPT:
 745                         llid = sta->llid;
 746                         spin_unlock_bh(&sta->lock);
 747                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 748                                             plid, 0);
 749                         break;
 750                 default:
 751                         spin_unlock_bh(&sta->lock);
 752                         break;
 753                 }
 754                 break;
 755         case PLINK_HOLDING:
 756                 switch (event) {
 757                 case CLS_ACPT:
 758                         if (del_timer(&sta->plink_timer))
 759                                 sta->ignore_plink_timer = 1;
 760                         mesh_plink_fsm_restart(sta);
 761                         spin_unlock_bh(&sta->lock);
 762                         break;
 763                 case OPN_ACPT:
 764                 case CNF_ACPT:
 765                 case OPN_RJCT:
 766                 case CNF_RJCT:
 767                         llid = sta->llid;
 768                         reason = sta->reason;
 769                         spin_unlock_bh(&sta->lock);
 770                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr,
 771                                             llid, plid, reason);
 772                         break;
 773                 default:
 774                         spin_unlock_bh(&sta->lock);
 775                 }
 776                 break;
 777         default:
 778                 /* should not get here, PLINK_BLOCKED is dealt with at the
 779                  * beginning of the function
 780                  */
 781                 spin_unlock_bh(&sta->lock);
 782                 break;
 783         }
 784
 785         rcu_read_unlock();
 786 }