net/mac80211/mesh_plink.c

   1 /*
   2  * Copyright (c) 2008 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/kernel.h>
  10 #include <linux/random.h>
  11 #include "ieee80211_i.h"
  12 #include "rate.h"
  13 #include "mesh.h"
  14
  15 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
  16 #define mpl_dbg(fmt, args...)   printk(KERN_DEBUG fmt, ##args)
  17 #else
  18 #define mpl_dbg(fmt, args...)   do { (void)(0); } while (0)
  19 #endif
  20
  21 #define PLINK_GET_LLID(p) (p + 4)
  22 #define PLINK_GET_PLID(p) (p + 6)
  23
  24 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
  25                                 jiffies + HZ * t / 1000))
  26
  27 /* Peer link cancel reasons, all subject to ANA approval */
  28 #define MESH_LINK_CANCELLED                     2
  29 #define MESH_MAX_NEIGHBORS                      3
  30 #define MESH_CAPABILITY_POLICY_VIOLATION        4
  31 #define MESH_CLOSE_RCVD                         5
  32 #define MESH_MAX_RETRIES                        6
  33 #define MESH_CONFIRM_TIMEOUT                    7
  34 #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS  8
  35 #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9
  36 #define MESH_SECURITY_FAILED_VERIFICATION       10
  37
  38 #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries)
  39 #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout)
  40 #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout)
  41 #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout)
  42 #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks)
  43
  44 enum plink_frame_type {
  45         PLINK_OPEN = 0,
  46         PLINK_CONFIRM,
  47         PLINK_CLOSE
  48 };
  49
  50 enum plink_event {
  51         PLINK_UNDEFINED,
  52         OPN_ACPT,
  53         OPN_RJCT,
  54         OPN_IGNR,
  55         CNF_ACPT,
  56         CNF_RJCT,
  57         CNF_IGNR,
  58         CLS_ACPT,
  59         CLS_IGNR
  60 };
  61
  62 static inline
  63 void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
  64 {
  65         atomic_inc(&sdata->u.mesh.mshstats.estab_plinks);
  66         mesh_accept_plinks_update(sdata);
  67         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
  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         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
  76 }
  77
  78 /**
  79  * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
  80  *
  81  * @sta: mesh peer link to restart
  82  *
  83  * Locking: this function must be called holding sta->lock
  84  */
  85 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
  86 {
  87         sta->plink_state = PLINK_LISTEN;
  88         sta->llid = sta->plid = sta->reason = 0;
  89         sta->plink_retries = 0;
  90 }
  91
  92 /*
  93  * NOTE: This is just an alias for sta_info_alloc(), see notes
  94  *       on it in the lifecycle management section!
  95  */
  96 static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
  97                                          u8 *hw_addr, u32 rates)
  98 {
  99         struct ieee80211_local *local = sdata->local;
 100         struct sta_info *sta;
 101
 102         if (local->num_sta >= MESH_MAX_PLINKS)
 103                 return NULL;
 104
 105         sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC);
 106         if (!sta)
 107                 return NULL;
 108
 109         sta->flags = WLAN_STA_AUTHORIZED;
 110         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
 111         rate_control_rate_init(sta);
 112
 113         return sta;
 114 }
 115
 116 /**
 117  * mesh_plink_deactivate - deactivate mesh peer link
 118  *
 119  * @sta: mesh peer link to deactivate
 120  *
 121  * All mesh paths with this peer as next hop will be flushed
 122  *
 123  * Locking: the caller must hold sta->lock
 124  */
 125 static void __mesh_plink_deactivate(struct sta_info *sta)
 126 {
 127         struct ieee80211_sub_if_data *sdata = sta->sdata;
 128
 129         if (sta->plink_state == PLINK_ESTAB)
 130                 mesh_plink_dec_estab_count(sdata);
 131         sta->plink_state = PLINK_BLOCKED;
 132         mesh_path_flush_by_nexthop(sta);
 133 }
 134
 135 /**
 136  * __mesh_plink_deactivate - deactivate mesh peer link
 137  *
 138  * @sta: mesh peer link to deactivate
 139  *
 140  * All mesh paths with this peer as next hop will be flushed
 141  */
 142 void mesh_plink_deactivate(struct sta_info *sta)
 143 {
 144         spin_lock_bh(&sta->lock);
 145         __mesh_plink_deactivate(sta);
 146         spin_unlock_bh(&sta->lock);
 147 }
 148
 149 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
 150                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
 151                 __le16 reason) {
 152         struct ieee80211_local *local = sdata->local;
 153         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 154         struct ieee80211_mgmt *mgmt;
 155         bool include_plid = false;
 156         static const u8 meshpeeringproto[] = { 0x00, 0x0F, 0xAC, 0x2A };
 157         u8 *pos;
 158         int ie_len;
 159
 160         if (!skb)
 161                 return -1;
 162         skb_reserve(skb, local->hw.extra_tx_headroom);
 163         /* 25 is the size of the common mgmt part (24) plus the size of the
 164          * common action part (1)
 165          */
 166         mgmt = (struct ieee80211_mgmt *)
 167                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
 168         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
 169         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 170                                           IEEE80211_STYPE_ACTION);
 171         memcpy(mgmt->da, da, ETH_ALEN);
 172         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 173         /* BSSID is left zeroed, wildcard value */
 174         mgmt->u.action.category = MESH_PLINK_CATEGORY;
 175         mgmt->u.action.u.plink_action.action_code = action;
 176
 177         if (action == PLINK_CLOSE)
 178                 mgmt->u.action.u.plink_action.aux = reason;
 179         else {
 180                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
 181                 if (action == PLINK_CONFIRM) {
 182                         pos = skb_put(skb, 4);
 183                         /* two-byte status code followed by two-byte AID */
 184                         memset(pos, 0, 4);
 185                 }
 186                 mesh_mgmt_ies_add(skb, sdata);
 187         }
 188
 189         /* Add Peer Link Management element */
 190         switch (action) {
 191         case PLINK_OPEN:
 192                 ie_len = 6;
 193                 break;
 194         case PLINK_CONFIRM:
 195                 ie_len = 8;
 196                 include_plid = true;
 197                 break;
 198         case PLINK_CLOSE:
 199         default:
 200                 if (!plid)
 201                         ie_len = 8;
 202                 else {
 203                         ie_len = 10;
 204                         include_plid = true;
 205                 }
 206                 break;
 207         }
 208
 209         pos = skb_put(skb, 2 + ie_len);
 210         *pos++ = WLAN_EID_PEER_LINK;
 211         *pos++ = ie_len;
 212         memcpy(pos, meshpeeringproto, sizeof(meshpeeringproto));
 213         pos += 4;
 214         memcpy(pos, &llid, 2);
 215         if (include_plid) {
 216                 pos += 2;
 217                 memcpy(pos, &plid, 2);
 218         }
 219         if (action == PLINK_CLOSE) {
 220                 pos += 2;
 221                 memcpy(pos, &reason, 2);
 222         }
 223
 224         ieee80211_tx_skb(sdata, skb, 1);
 225         return 0;
 226 }
 227
 228 void mesh_neighbour_update(u8 *hw_addr, u32 rates, struct ieee80211_sub_if_data *sdata,
 229                            bool peer_accepting_plinks)
 230 {
 231         struct ieee80211_local *local = sdata->local;
 232         struct sta_info *sta;
 233
 234         rcu_read_lock();
 235
 236         sta = sta_info_get(local, hw_addr);
 237         if (!sta) {
 238                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
 239                 if (!sta) {
 240                         rcu_read_unlock();
 241                         return;
 242                 }
 243                 if (sta_info_insert(sta)) {
 244                         rcu_read_unlock();
 245                         return;
 246                 }
 247         }
 248
 249         sta->last_rx = jiffies;
 250         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
 251         if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN &&
 252                         sdata->u.mesh.accepting_plinks &&
 253                         sdata->u.mesh.mshcfg.auto_open_plinks)
 254                 mesh_plink_open(sta);
 255
 256         rcu_read_unlock();
 257 }
 258
 259 static void mesh_plink_timer(unsigned long data)
 260 {
 261         struct sta_info *sta;
 262         __le16 llid, plid, reason;
 263         struct ieee80211_sub_if_data *sdata;
 264
 265         /*
 266          * This STA is valid because sta_info_destroy() will
 267          * del_timer_sync() this timer after having made sure
 268          * it cannot be readded (by deleting the plink.)
 269          */
 270         sta = (struct sta_info *) data;
 271
 272         if (sta->sdata->local->quiescing) {
 273                 sta->plink_timer_was_running = true;
 274                 return;
 275         }
 276
 277         spin_lock_bh(&sta->lock);
 278         if (sta->ignore_plink_timer) {
 279                 sta->ignore_plink_timer = false;
 280                 spin_unlock_bh(&sta->lock);
 281                 return;
 282         }
 283         mpl_dbg("Mesh plink timer for %pM fired on state %d\n",
 284                 sta->sta.addr, sta->plink_state);
 285         reason = 0;
 286         llid = sta->llid;
 287         plid = sta->plid;
 288         sdata = sta->sdata;
 289
 290         switch (sta->plink_state) {
 291         case PLINK_OPN_RCVD:
 292         case PLINK_OPN_SNT:
 293                 /* retry timer */
 294                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
 295                         u32 rand;
 296                         mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n",
 297                                 sta->sta.addr, sta->plink_retries,
 298                                 sta->plink_timeout);
 299                         get_random_bytes(&rand, sizeof(u32));
 300                         sta->plink_timeout = sta->plink_timeout +
 301                                              rand % sta->plink_timeout;
 302                         ++sta->plink_retries;
 303                         mod_plink_timer(sta, sta->plink_timeout);
 304                         spin_unlock_bh(&sta->lock);
 305                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
 306                                             0, 0);
 307                         break;
 308                 }
 309                 reason = cpu_to_le16(MESH_MAX_RETRIES);
 310                 /* fall through on else */
 311         case PLINK_CNF_RCVD:
 312                 /* confirm timer */
 313                 if (!reason)
 314                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
 315                 sta->plink_state = PLINK_HOLDING;
 316                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 317                 spin_unlock_bh(&sta->lock);
 318                 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid,
 319                                     reason);
 320                 break;
 321         case PLINK_HOLDING:
 322                 /* holding timer */
 323                 del_timer(&sta->plink_timer);
 324                 mesh_plink_fsm_restart(sta);
 325                 spin_unlock_bh(&sta->lock);
 326                 break;
 327         default:
 328                 spin_unlock_bh(&sta->lock);
 329                 break;
 330         }
 331 }
 332
 333 #ifdef CONFIG_PM
 334 void mesh_plink_quiesce(struct sta_info *sta)
 335 {
 336         if (del_timer_sync(&sta->plink_timer))
 337                 sta->plink_timer_was_running = true;
 338 }
 339
 340 void mesh_plink_restart(struct sta_info *sta)
 341 {
 342         if (sta->plink_timer_was_running) {
 343                 add_timer(&sta->plink_timer);
 344                 sta->plink_timer_was_running = false;
 345         }
 346 }
 347 #endif
 348
 349 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
 350 {
 351         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
 352         sta->plink_timer.data = (unsigned long) sta;
 353         sta->plink_timer.function = mesh_plink_timer;
 354         sta->plink_timeout = timeout;
 355         add_timer(&sta->plink_timer);
 356 }
 357
 358 int mesh_plink_open(struct sta_info *sta)
 359 {
 360         __le16 llid;
 361         struct ieee80211_sub_if_data *sdata = sta->sdata;
 362
 363         spin_lock_bh(&sta->lock);
 364         get_random_bytes(&llid, 2);
 365         sta->llid = llid;
 366         if (sta->plink_state != PLINK_LISTEN) {
 367                 spin_unlock_bh(&sta->lock);
 368                 return -EBUSY;
 369         }
 370         sta->plink_state = PLINK_OPN_SNT;
 371         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 372         spin_unlock_bh(&sta->lock);
 373         mpl_dbg("Mesh plink: starting establishment with %pM\n",
 374                 sta->sta.addr);
 375
 376         return mesh_plink_frame_tx(sdata, PLINK_OPEN,
 377                                    sta->sta.addr, llid, 0, 0);
 378 }
 379
 380 void mesh_plink_block(struct sta_info *sta)
 381 {
 382         spin_lock_bh(&sta->lock);
 383         __mesh_plink_deactivate(sta);
 384         sta->plink_state = PLINK_BLOCKED;
 385         spin_unlock_bh(&sta->lock);
 386 }
 387
 388
 389 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
 390                          size_t len, struct ieee80211_rx_status *rx_status)
 391 {
 392         struct ieee80211_local *local = sdata->local;
 393         struct ieee802_11_elems elems;
 394         struct sta_info *sta;
 395         enum plink_event event;
 396         enum plink_frame_type ftype;
 397         size_t baselen;
 398         u8 ie_len;
 399         u8 *baseaddr;
 400         __le16 plid, llid, reason;
 401 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 402         static const char *mplstates[] = {
 403                 [PLINK_LISTEN] = "LISTEN",
 404                 [PLINK_OPN_SNT] = "OPN-SNT",
 405                 [PLINK_OPN_RCVD] = "OPN-RCVD",
 406                 [PLINK_CNF_RCVD] = "CNF_RCVD",
 407                 [PLINK_ESTAB] = "ESTAB",
 408                 [PLINK_HOLDING] = "HOLDING",
 409                 [PLINK_BLOCKED] = "BLOCKED"
 410         };
 411 #endif
 412
 413         /* need action_code, aux */
 414         if (len < IEEE80211_MIN_ACTION_SIZE + 3)
 415                 return;
 416
 417         if (is_multicast_ether_addr(mgmt->da)) {
 418                 mpl_dbg("Mesh plink: ignore frame from multicast address");
 419                 return;
 420         }
 421
 422         baseaddr = mgmt->u.action.u.plink_action.variable;
 423         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
 424         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
 425                 baseaddr += 4;
 426                 baselen += 4;
 427         }
 428         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
 429         if (!elems.peer_link) {
 430                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
 431                 return;
 432         }
 433
 434         ftype = mgmt->u.action.u.plink_action.action_code;
 435         ie_len = elems.peer_link_len;
 436         if ((ftype == PLINK_OPEN && ie_len != 6) ||
 437             (ftype == PLINK_CONFIRM && ie_len != 8) ||
 438             (ftype == PLINK_CLOSE && ie_len != 8 && ie_len != 10)) {
 439                 mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n",
 440                     ftype, ie_len);
 441                 return;
 442         }
 443
 444         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
 445                 mpl_dbg("Mesh plink: missing necessary ie\n");
 446                 return;
 447         }
 448         /* Note the lines below are correct, the llid in the frame is the plid
 449          * from the point of view of this host.
 450          */
 451         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
 452         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 10))
 453                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
 454
 455         rcu_read_lock();
 456
 457         sta = sta_info_get(local, mgmt->sa);
 458         if (!sta && ftype != PLINK_OPEN) {
 459                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
 460                 rcu_read_unlock();
 461                 return;
 462         }
 463
 464         if (sta && sta->plink_state == PLINK_BLOCKED) {
 465                 rcu_read_unlock();
 466                 return;
 467         }
 468
 469         /* Now we will figure out the appropriate event... */
 470         event = PLINK_UNDEFINED;
 471         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) {
 472                 switch (ftype) {
 473                 case PLINK_OPEN:
 474                         event = OPN_RJCT;
 475                         break;
 476                 case PLINK_CONFIRM:
 477                         event = CNF_RJCT;
 478                         break;
 479                 case PLINK_CLOSE:
 480                         /* avoid warning */
 481                         break;
 482                 }
 483                 spin_lock_bh(&sta->lock);
 484         } else if (!sta) {
 485                 /* ftype == PLINK_OPEN */
 486                 u32 rates;
 487                 if (!mesh_plink_free_count(sdata)) {
 488                         mpl_dbg("Mesh plink error: no more free plinks\n");
 489                         rcu_read_unlock();
 490                         return;
 491                 }
 492
 493                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
 494                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
 495                 if (!sta) {
 496                         mpl_dbg("Mesh plink error: plink table full\n");
 497                         rcu_read_unlock();
 498                         return;
 499                 }
 500                 if (sta_info_insert(sta)) {
 501                         rcu_read_unlock();
 502                         return;
 503                 }
 504                 event = OPN_ACPT;
 505                 spin_lock_bh(&sta->lock);
 506         } else {
 507                 spin_lock_bh(&sta->lock);
 508                 switch (ftype) {
 509                 case PLINK_OPEN:
 510                         if (!mesh_plink_free_count(sdata) ||
 511                             (sta->plid && sta->plid != plid))
 512                                 event = OPN_IGNR;
 513                         else
 514                                 event = OPN_ACPT;
 515                         break;
 516                 case PLINK_CONFIRM:
 517                         if (!mesh_plink_free_count(sdata) ||
 518                             (sta->llid != llid || sta->plid != plid))
 519                                 event = CNF_IGNR;
 520                         else
 521                                 event = CNF_ACPT;
 522                         break;
 523                 case PLINK_CLOSE:
 524                         if (sta->plink_state == PLINK_ESTAB)
 525                                 /* Do not check for llid or plid. This does not
 526                                  * follow the standard but since multiple plinks
 527                                  * per sta are not supported, it is necessary in
 528                                  * order to avoid a livelock when MP A sees an
 529                                  * establish peer link to MP B but MP B does not
 530                                  * see it. This can be caused by a timeout in
 531                                  * B's peer link establishment or B beign
 532                                  * restarted.
 533                                  */
 534                                 event = CLS_ACPT;
 535                         else if (sta->plid != plid)
 536                                 event = CLS_IGNR;
 537                         else if (ie_len == 7 && sta->llid != llid)
 538                                 event = CLS_IGNR;
 539                         else
 540                                 event = CLS_ACPT;
 541                         break;
 542                 default:
 543                         mpl_dbg("Mesh plink: unknown frame subtype\n");
 544                         spin_unlock_bh(&sta->lock);
 545                         rcu_read_unlock();
 546                         return;
 547                 }
 548         }
 549
 550         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
 551                 mgmt->sa, mplstates[sta->plink_state],
 552                 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
 553                 event);
 554         reason = 0;
 555         switch (sta->plink_state) {
 556                 /* spin_unlock as soon as state is updated at each case */
 557         case PLINK_LISTEN:
 558                 switch (event) {
 559                 case CLS_ACPT:
 560                         mesh_plink_fsm_restart(sta);
 561                         spin_unlock_bh(&sta->lock);
 562                         break;
 563                 case OPN_ACPT:
 564                         sta->plink_state = PLINK_OPN_RCVD;
 565                         sta->plid = plid;
 566                         get_random_bytes(&llid, 2);
 567                         sta->llid = llid;
 568                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 569                         spin_unlock_bh(&sta->lock);
 570                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
 571                                             0, 0);
 572                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr,
 573                                             llid, plid, 0);
 574                         break;
 575                 default:
 576                         spin_unlock_bh(&sta->lock);
 577                         break;
 578                 }
 579                 break;
 580
 581         case PLINK_OPN_SNT:
 582                 switch (event) {
 583                 case OPN_RJCT:
 584                 case CNF_RJCT:
 585                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 586                 case CLS_ACPT:
 587                         if (!reason)
 588                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 589                         sta->reason = reason;
 590                         sta->plink_state = PLINK_HOLDING;
 591                         if (!mod_plink_timer(sta,
 592                                              dot11MeshHoldingTimeout(sdata)))
 593                                 sta->ignore_plink_timer = true;
 594
 595                         llid = sta->llid;
 596                         spin_unlock_bh(&sta->lock);
 597                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 598                                             plid, reason);
 599                         break;
 600                 case OPN_ACPT:
 601                         /* retry timer is left untouched */
 602                         sta->plink_state = PLINK_OPN_RCVD;
 603                         sta->plid = plid;
 604                         llid = sta->llid;
 605                         spin_unlock_bh(&sta->lock);
 606                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 607                                             plid, 0);
 608                         break;
 609                 case CNF_ACPT:
 610                         sta->plink_state = PLINK_CNF_RCVD;
 611                         if (!mod_plink_timer(sta,
 612                                              dot11MeshConfirmTimeout(sdata)))
 613                                 sta->ignore_plink_timer = true;
 614
 615                         spin_unlock_bh(&sta->lock);
 616                         break;
 617                 default:
 618                         spin_unlock_bh(&sta->lock);
 619                         break;
 620                 }
 621                 break;
 622
 623         case PLINK_OPN_RCVD:
 624                 switch (event) {
 625                 case OPN_RJCT:
 626                 case CNF_RJCT:
 627                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 628                 case CLS_ACPT:
 629                         if (!reason)
 630                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 631                         sta->reason = reason;
 632                         sta->plink_state = PLINK_HOLDING;
 633                         if (!mod_plink_timer(sta,
 634                                              dot11MeshHoldingTimeout(sdata)))
 635                                 sta->ignore_plink_timer = true;
 636
 637                         llid = sta->llid;
 638                         spin_unlock_bh(&sta->lock);
 639                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 640                                             plid, reason);
 641                         break;
 642                 case OPN_ACPT:
 643                         llid = sta->llid;
 644                         spin_unlock_bh(&sta->lock);
 645                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 646                                             plid, 0);
 647                         break;
 648                 case CNF_ACPT:
 649                         del_timer(&sta->plink_timer);
 650                         sta->plink_state = PLINK_ESTAB;
 651                         mesh_plink_inc_estab_count(sdata);
 652                         spin_unlock_bh(&sta->lock);
 653                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
 654                                 sta->sta.addr);
 655                         break;
 656                 default:
 657                         spin_unlock_bh(&sta->lock);
 658                         break;
 659                 }
 660                 break;
 661
 662         case PLINK_CNF_RCVD:
 663                 switch (event) {
 664                 case OPN_RJCT:
 665                 case CNF_RJCT:
 666                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 667                 case CLS_ACPT:
 668                         if (!reason)
 669                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 670                         sta->reason = reason;
 671                         sta->plink_state = PLINK_HOLDING;
 672                         if (!mod_plink_timer(sta,
 673                                              dot11MeshHoldingTimeout(sdata)))
 674                                 sta->ignore_plink_timer = true;
 675
 676                         llid = sta->llid;
 677                         spin_unlock_bh(&sta->lock);
 678                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 679                                             plid, reason);
 680                         break;
 681                 case OPN_ACPT:
 682                         del_timer(&sta->plink_timer);
 683                         sta->plink_state = PLINK_ESTAB;
 684                         mesh_plink_inc_estab_count(sdata);
 685                         spin_unlock_bh(&sta->lock);
 686                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
 687                                 sta->sta.addr);
 688                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 689                                             plid, 0);
 690                         break;
 691                 default:
 692                         spin_unlock_bh(&sta->lock);
 693                         break;
 694                 }
 695                 break;
 696
 697         case PLINK_ESTAB:
 698                 switch (event) {
 699                 case CLS_ACPT:
 700                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
 701                         sta->reason = reason;
 702                         __mesh_plink_deactivate(sta);
 703                         sta->plink_state = PLINK_HOLDING;
 704                         llid = sta->llid;
 705                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 706                         spin_unlock_bh(&sta->lock);
 707                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 708                                             plid, reason);
 709                         break;
 710                 case OPN_ACPT:
 711                         llid = sta->llid;
 712                         spin_unlock_bh(&sta->lock);
 713                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 714                                             plid, 0);
 715                         break;
 716                 default:
 717                         spin_unlock_bh(&sta->lock);
 718                         break;
 719                 }
 720                 break;
 721         case PLINK_HOLDING:
 722                 switch (event) {
 723                 case CLS_ACPT:
 724                         if (del_timer(&sta->plink_timer))
 725                                 sta->ignore_plink_timer = 1;
 726                         mesh_plink_fsm_restart(sta);
 727                         spin_unlock_bh(&sta->lock);
 728                         break;
 729                 case OPN_ACPT:
 730                 case CNF_ACPT:
 731                 case OPN_RJCT:
 732                 case CNF_RJCT:
 733                         llid = sta->llid;
 734                         reason = sta->reason;
 735                         spin_unlock_bh(&sta->lock);
 736                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr,
 737                                             llid, plid, reason);
 738                         break;
 739                 default:
 740                         spin_unlock_bh(&sta->lock);
 741                 }
 742                 break;
 743         default:
 744                 /* should not get here, PLINK_BLOCKED is dealt with at the
 745                  * beggining of the function
 746                  */
 747                 spin_unlock_bh(&sta->lock);
 748                 break;
 749         }
 750
 751         rcu_read_unlock();
 752 }