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_FRAME_SUBTYPE(p) (p)
  22 #define PLINK_GET_LLID(p) (p + 1)
  23 #define PLINK_GET_PLID(p) (p + 3)
  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: mes 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, u64 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_ATOMIC);
 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 void __mesh_plink_deactivate(struct sta_info *sta)
 125 {
 126         struct ieee80211_sub_if_data *sdata = sta->sdata;
 127
 128         if (sta->plink_state == PLINK_ESTAB)
 129                 mesh_plink_dec_estab_count(sdata);
 130         sta->plink_state = PLINK_BLOCKED;
 131         mesh_path_flush_by_nexthop(sta);
 132 }
 133
 134 /**
 135  * __mesh_plink_deactivate - deactivate mesh peer link
 136  *
 137  * @sta: mesh peer link to deactivate
 138  *
 139  * All mesh paths with this peer as next hop will be flushed
 140  */
 141 void mesh_plink_deactivate(struct sta_info *sta)
 142 {
 143         spin_lock_bh(&sta->lock);
 144         __mesh_plink_deactivate(sta);
 145         spin_unlock_bh(&sta->lock);
 146 }
 147
 148 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
 149                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
 150                 __le16 reason) {
 151         struct ieee80211_local *local = sdata->local;
 152         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 153         struct ieee80211_mgmt *mgmt;
 154         bool include_plid = false;
 155         u8 *pos;
 156         int ie_len;
 157
 158         if (!skb)
 159                 return -1;
 160         skb_reserve(skb, local->hw.extra_tx_headroom);
 161         /* 25 is the size of the common mgmt part (24) plus the size of the
 162          * common action part (1)
 163          */
 164         mgmt = (struct ieee80211_mgmt *)
 165                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
 166         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
 167         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 168                                           IEEE80211_STYPE_ACTION);
 169         memcpy(mgmt->da, da, ETH_ALEN);
 170         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 171         /* BSSID is left zeroed, wildcard value */
 172         mgmt->u.action.category = PLINK_CATEGORY;
 173         mgmt->u.action.u.plink_action.action_code = action;
 174
 175         if (action == PLINK_CLOSE)
 176                 mgmt->u.action.u.plink_action.aux = reason;
 177         else {
 178                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
 179                 if (action == PLINK_CONFIRM) {
 180                         pos = skb_put(skb, 4);
 181                         /* two-byte status code followed by two-byte AID */
 182                         memset(pos, 0, 4);
 183                 }
 184                 mesh_mgmt_ies_add(skb, sdata);
 185         }
 186
 187         /* Add Peer Link Management element */
 188         switch (action) {
 189         case PLINK_OPEN:
 190                 ie_len = 3;
 191                 break;
 192         case PLINK_CONFIRM:
 193                 ie_len = 5;
 194                 include_plid = true;
 195                 break;
 196         case PLINK_CLOSE:
 197         default:
 198                 if (!plid)
 199                         ie_len = 5;
 200                 else {
 201                         ie_len = 7;
 202                         include_plid = true;
 203                 }
 204                 break;
 205         }
 206
 207         pos = skb_put(skb, 2 + ie_len);
 208         *pos++ = WLAN_EID_PEER_LINK;
 209         *pos++ = ie_len;
 210         *pos++ = action;
 211         memcpy(pos, &llid, 2);
 212         if (include_plid) {
 213                 pos += 2;
 214                 memcpy(pos, &plid, 2);
 215         }
 216         if (action == PLINK_CLOSE) {
 217                 pos += 2;
 218                 memcpy(pos, &reason, 2);
 219         }
 220
 221         ieee80211_tx_skb(sdata, skb, 0);
 222         return 0;
 223 }
 224
 225 void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct ieee80211_sub_if_data *sdata,
 226                            bool peer_accepting_plinks)
 227 {
 228         struct ieee80211_local *local = sdata->local;
 229         struct sta_info *sta;
 230
 231         rcu_read_lock();
 232
 233         sta = sta_info_get(local, hw_addr);
 234         if (!sta) {
 235                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
 236                 if (!sta) {
 237                         rcu_read_unlock();
 238                         return;
 239                 }
 240                 if (sta_info_insert(sta)) {
 241                         rcu_read_unlock();
 242                         return;
 243                 }
 244         }
 245
 246         sta->last_rx = jiffies;
 247         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
 248         if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN &&
 249                         sdata->u.mesh.accepting_plinks &&
 250                         sdata->u.mesh.mshcfg.auto_open_plinks)
 251                 mesh_plink_open(sta);
 252
 253         rcu_read_unlock();
 254 }
 255
 256 static void mesh_plink_timer(unsigned long data)
 257 {
 258         struct sta_info *sta;
 259         __le16 llid, plid, reason;
 260         struct ieee80211_sub_if_data *sdata;
 261
 262         /*
 263          * This STA is valid because sta_info_destroy() will
 264          * del_timer_sync() this timer after having made sure
 265          * it cannot be readded (by deleting the plink.)
 266          */
 267         sta = (struct sta_info *) data;
 268
 269         spin_lock_bh(&sta->lock);
 270         if (sta->ignore_plink_timer) {
 271                 sta->ignore_plink_timer = false;
 272                 spin_unlock_bh(&sta->lock);
 273                 return;
 274         }
 275         mpl_dbg("Mesh plink timer for %pM fired on state %d\n",
 276                 sta->sta.addr, sta->plink_state);
 277         reason = 0;
 278         llid = sta->llid;
 279         plid = sta->plid;
 280         sdata = sta->sdata;
 281
 282         switch (sta->plink_state) {
 283         case PLINK_OPN_RCVD:
 284         case PLINK_OPN_SNT:
 285                 /* retry timer */
 286                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
 287                         u32 rand;
 288                         mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n",
 289                                 sta->sta.addr, sta->plink_retries,
 290                                 sta->plink_timeout);
 291                         get_random_bytes(&rand, sizeof(u32));
 292                         sta->plink_timeout = sta->plink_timeout +
 293                                              rand % sta->plink_timeout;
 294                         ++sta->plink_retries;
 295                         mod_plink_timer(sta, sta->plink_timeout);
 296                         spin_unlock_bh(&sta->lock);
 297                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
 298                                             0, 0);
 299                         break;
 300                 }
 301                 reason = cpu_to_le16(MESH_MAX_RETRIES);
 302                 /* fall through on else */
 303         case PLINK_CNF_RCVD:
 304                 /* confirm timer */
 305                 if (!reason)
 306                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
 307                 sta->plink_state = PLINK_HOLDING;
 308                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 309                 spin_unlock_bh(&sta->lock);
 310                 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid,
 311                                     reason);
 312                 break;
 313         case PLINK_HOLDING:
 314                 /* holding timer */
 315                 del_timer(&sta->plink_timer);
 316                 mesh_plink_fsm_restart(sta);
 317                 spin_unlock_bh(&sta->lock);
 318                 break;
 319         default:
 320                 spin_unlock_bh(&sta->lock);
 321                 break;
 322         }
 323 }
 324
 325 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
 326 {
 327         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
 328         sta->plink_timer.data = (unsigned long) sta;
 329         sta->plink_timer.function = mesh_plink_timer;
 330         sta->plink_timeout = timeout;
 331         add_timer(&sta->plink_timer);
 332 }
 333
 334 int mesh_plink_open(struct sta_info *sta)
 335 {
 336         __le16 llid;
 337         struct ieee80211_sub_if_data *sdata = sta->sdata;
 338
 339         spin_lock_bh(&sta->lock);
 340         get_random_bytes(&llid, 2);
 341         sta->llid = llid;
 342         if (sta->plink_state != PLINK_LISTEN) {
 343                 spin_unlock_bh(&sta->lock);
 344                 return -EBUSY;
 345         }
 346         sta->plink_state = PLINK_OPN_SNT;
 347         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 348         spin_unlock_bh(&sta->lock);
 349         mpl_dbg("Mesh plink: starting establishment with %pM\n",
 350                 sta->sta.addr);
 351
 352         return mesh_plink_frame_tx(sdata, PLINK_OPEN,
 353                                    sta->sta.addr, llid, 0, 0);
 354 }
 355
 356 void mesh_plink_block(struct sta_info *sta)
 357 {
 358         spin_lock_bh(&sta->lock);
 359         __mesh_plink_deactivate(sta);
 360         sta->plink_state = PLINK_BLOCKED;
 361         spin_unlock_bh(&sta->lock);
 362 }
 363
 364 int mesh_plink_close(struct sta_info *sta)
 365 {
 366         struct ieee80211_sub_if_data *sdata = sta->sdata;
 367         __le16 llid, plid, reason;
 368
 369         mpl_dbg("Mesh plink: closing link with %pM\n", sta->sta.addr);
 370         spin_lock_bh(&sta->lock);
 371         sta->reason = cpu_to_le16(MESH_LINK_CANCELLED);
 372         reason = sta->reason;
 373
 374         if (sta->plink_state == PLINK_LISTEN ||
 375             sta->plink_state == PLINK_BLOCKED) {
 376                 mesh_plink_fsm_restart(sta);
 377                 spin_unlock_bh(&sta->lock);
 378                 return 0;
 379         } else if (sta->plink_state == PLINK_ESTAB) {
 380                 __mesh_plink_deactivate(sta);
 381                 /* The timer should not be running */
 382                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 383         } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
 384                 sta->ignore_plink_timer = true;
 385
 386         sta->plink_state = PLINK_HOLDING;
 387         llid = sta->llid;
 388         plid = sta->plid;
 389         spin_unlock_bh(&sta->lock);
 390         mesh_plink_frame_tx(sta->sdata, PLINK_CLOSE, sta->sta.addr, llid,
 391                             plid, reason);
 392         return 0;
 393 }
 394
 395 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
 396                          size_t len, struct ieee80211_rx_status *rx_status)
 397 {
 398         struct ieee80211_local *local = sdata->local;
 399         struct ieee802_11_elems elems;
 400         struct sta_info *sta;
 401         enum plink_event event;
 402         enum plink_frame_type ftype;
 403         size_t baselen;
 404         u8 ie_len;
 405         u8 *baseaddr;
 406         __le16 plid, llid, reason;
 407
 408         /* need action_code, aux */
 409         if (len < IEEE80211_MIN_ACTION_SIZE + 3)
 410                 return;
 411
 412         if (is_multicast_ether_addr(mgmt->da)) {
 413                 mpl_dbg("Mesh plink: ignore frame from multicast address");
 414                 return;
 415         }
 416
 417         baseaddr = mgmt->u.action.u.plink_action.variable;
 418         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
 419         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
 420                 baseaddr += 4;
 421                 baselen -= 4;
 422         }
 423         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
 424         if (!elems.peer_link) {
 425                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
 426                 return;
 427         }
 428
 429         ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link));
 430         ie_len = elems.peer_link_len;
 431         if ((ftype == PLINK_OPEN && ie_len != 3) ||
 432             (ftype == PLINK_CONFIRM && ie_len != 5) ||
 433             (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) {
 434                 mpl_dbg("Mesh plink: incorrect plink ie length\n");
 435                 return;
 436         }
 437
 438         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
 439                 mpl_dbg("Mesh plink: missing necessary ie\n");
 440                 return;
 441         }
 442         /* Note the lines below are correct, the llid in the frame is the plid
 443          * from the point of view of this host.
 444          */
 445         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
 446         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7))
 447                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
 448
 449         rcu_read_lock();
 450
 451         sta = sta_info_get(local, mgmt->sa);
 452         if (!sta && ftype != PLINK_OPEN) {
 453                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
 454                 rcu_read_unlock();
 455                 return;
 456         }
 457
 458         if (sta && sta->plink_state == PLINK_BLOCKED) {
 459                 rcu_read_unlock();
 460                 return;
 461         }
 462
 463         /* Now we will figure out the appropriate event... */
 464         event = PLINK_UNDEFINED;
 465         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) {
 466                 switch (ftype) {
 467                 case PLINK_OPEN:
 468                         event = OPN_RJCT;
 469                         break;
 470                 case PLINK_CONFIRM:
 471                         event = CNF_RJCT;
 472                         break;
 473                 case PLINK_CLOSE:
 474                         /* avoid warning */
 475                         break;
 476                 }
 477                 spin_lock_bh(&sta->lock);
 478         } else if (!sta) {
 479                 /* ftype == PLINK_OPEN */
 480                 u64 rates;
 481                 if (!mesh_plink_free_count(sdata)) {
 482                         mpl_dbg("Mesh plink error: no more free plinks\n");
 483                         rcu_read_unlock();
 484                         return;
 485                 }
 486
 487                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
 488                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
 489                 if (!sta) {
 490                         mpl_dbg("Mesh plink error: plink table full\n");
 491                         rcu_read_unlock();
 492                         return;
 493                 }
 494                 if (sta_info_insert(sta)) {
 495                         rcu_read_unlock();
 496                         return;
 497                 }
 498                 event = OPN_ACPT;
 499                 spin_lock_bh(&sta->lock);
 500         } else {
 501                 spin_lock_bh(&sta->lock);
 502                 switch (ftype) {
 503                 case PLINK_OPEN:
 504                         if (!mesh_plink_free_count(sdata) ||
 505                             (sta->plid && sta->plid != plid))
 506                                 event = OPN_IGNR;
 507                         else
 508                                 event = OPN_ACPT;
 509                         break;
 510                 case PLINK_CONFIRM:
 511                         if (!mesh_plink_free_count(sdata) ||
 512                             (sta->llid != llid || sta->plid != plid))
 513                                 event = CNF_IGNR;
 514                         else
 515                                 event = CNF_ACPT;
 516                         break;
 517                 case PLINK_CLOSE:
 518                         if (sta->plink_state == PLINK_ESTAB)
 519                                 /* Do not check for llid or plid. This does not
 520                                  * follow the standard but since multiple plinks
 521                                  * per sta are not supported, it is necessary in
 522                                  * order to avoid a livelock when MP A sees an
 523                                  * establish peer link to MP B but MP B does not
 524                                  * see it. This can be caused by a timeout in
 525                                  * B's peer link establishment or B beign
 526                                  * restarted.
 527                                  */
 528                                 event = CLS_ACPT;
 529                         else if (sta->plid != plid)
 530                                 event = CLS_IGNR;
 531                         else if (ie_len == 7 && sta->llid != llid)
 532                                 event = CLS_IGNR;
 533                         else
 534                                 event = CLS_ACPT;
 535                         break;
 536                 default:
 537                         mpl_dbg("Mesh plink: unknown frame subtype\n");
 538                         spin_unlock_bh(&sta->lock);
 539                         rcu_read_unlock();
 540                         return;
 541                 }
 542         }
 543
 544         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %d %d %d %d\n",
 545                 mgmt->sa, sta->plink_state,
 546                 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
 547                 event);
 548         reason = 0;
 549         switch (sta->plink_state) {
 550                 /* spin_unlock as soon as state is updated at each case */
 551         case PLINK_LISTEN:
 552                 switch (event) {
 553                 case CLS_ACPT:
 554                         mesh_plink_fsm_restart(sta);
 555                         spin_unlock_bh(&sta->lock);
 556                         break;
 557                 case OPN_ACPT:
 558                         sta->plink_state = PLINK_OPN_RCVD;
 559                         sta->plid = plid;
 560                         get_random_bytes(&llid, 2);
 561                         sta->llid = llid;
 562                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 563                         spin_unlock_bh(&sta->lock);
 564                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
 565                                             0, 0);
 566                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr,
 567                                             llid, plid, 0);
 568                         break;
 569                 default:
 570                         spin_unlock_bh(&sta->lock);
 571                         break;
 572                 }
 573                 break;
 574
 575         case PLINK_OPN_SNT:
 576                 switch (event) {
 577                 case OPN_RJCT:
 578                 case CNF_RJCT:
 579                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 580                 case CLS_ACPT:
 581                         if (!reason)
 582                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 583                         sta->reason = reason;
 584                         sta->plink_state = PLINK_HOLDING;
 585                         if (!mod_plink_timer(sta,
 586                                              dot11MeshHoldingTimeout(sdata)))
 587                                 sta->ignore_plink_timer = true;
 588
 589                         llid = sta->llid;
 590                         spin_unlock_bh(&sta->lock);
 591                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 592                                             plid, reason);
 593                         break;
 594                 case OPN_ACPT:
 595                         /* retry timer is left untouched */
 596                         sta->plink_state = PLINK_OPN_RCVD;
 597                         sta->plid = plid;
 598                         llid = sta->llid;
 599                         spin_unlock_bh(&sta->lock);
 600                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 601                                             plid, 0);
 602                         break;
 603                 case CNF_ACPT:
 604                         sta->plink_state = PLINK_CNF_RCVD;
 605                         if (!mod_plink_timer(sta,
 606                                              dot11MeshConfirmTimeout(sdata)))
 607                                 sta->ignore_plink_timer = true;
 608
 609                         spin_unlock_bh(&sta->lock);
 610                         break;
 611                 default:
 612                         spin_unlock_bh(&sta->lock);
 613                         break;
 614                 }
 615                 break;
 616
 617         case PLINK_OPN_RCVD:
 618                 switch (event) {
 619                 case OPN_RJCT:
 620                 case CNF_RJCT:
 621                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 622                 case CLS_ACPT:
 623                         if (!reason)
 624                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 625                         sta->reason = reason;
 626                         sta->plink_state = PLINK_HOLDING;
 627                         if (!mod_plink_timer(sta,
 628                                              dot11MeshHoldingTimeout(sdata)))
 629                                 sta->ignore_plink_timer = true;
 630
 631                         llid = sta->llid;
 632                         spin_unlock_bh(&sta->lock);
 633                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 634                                             plid, reason);
 635                         break;
 636                 case OPN_ACPT:
 637                         llid = sta->llid;
 638                         spin_unlock_bh(&sta->lock);
 639                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 640                                             plid, 0);
 641                         break;
 642                 case CNF_ACPT:
 643                         del_timer(&sta->plink_timer);
 644                         sta->plink_state = PLINK_ESTAB;
 645                         mesh_plink_inc_estab_count(sdata);
 646                         spin_unlock_bh(&sta->lock);
 647                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
 648                                 sta->sta.addr);
 649                         break;
 650                 default:
 651                         spin_unlock_bh(&sta->lock);
 652                         break;
 653                 }
 654                 break;
 655
 656         case PLINK_CNF_RCVD:
 657                 switch (event) {
 658                 case OPN_RJCT:
 659                 case CNF_RJCT:
 660                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 661                 case CLS_ACPT:
 662                         if (!reason)
 663                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 664                         sta->reason = reason;
 665                         sta->plink_state = PLINK_HOLDING;
 666                         if (!mod_plink_timer(sta,
 667                                              dot11MeshHoldingTimeout(sdata)))
 668                                 sta->ignore_plink_timer = true;
 669
 670                         llid = sta->llid;
 671                         spin_unlock_bh(&sta->lock);
 672                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 673                                             plid, reason);
 674                         break;
 675                 case OPN_ACPT:
 676                         del_timer(&sta->plink_timer);
 677                         sta->plink_state = PLINK_ESTAB;
 678                         mesh_plink_inc_estab_count(sdata);
 679                         spin_unlock_bh(&sta->lock);
 680                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
 681                                 sta->sta.addr);
 682                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 683                                             plid, 0);
 684                         break;
 685                 default:
 686                         spin_unlock_bh(&sta->lock);
 687                         break;
 688                 }
 689                 break;
 690
 691         case PLINK_ESTAB:
 692                 switch (event) {
 693                 case CLS_ACPT:
 694                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
 695                         sta->reason = reason;
 696                         __mesh_plink_deactivate(sta);
 697                         sta->plink_state = PLINK_HOLDING;
 698                         llid = sta->llid;
 699                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 700                         spin_unlock_bh(&sta->lock);
 701                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 702                                             plid, reason);
 703                         break;
 704                 case OPN_ACPT:
 705                         llid = sta->llid;
 706                         spin_unlock_bh(&sta->lock);
 707                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 708                                             plid, 0);
 709                         break;
 710                 default:
 711                         spin_unlock_bh(&sta->lock);
 712                         break;
 713                 }
 714                 break;
 715         case PLINK_HOLDING:
 716                 switch (event) {
 717                 case CLS_ACPT:
 718                         if (del_timer(&sta->plink_timer))
 719                                 sta->ignore_plink_timer = 1;
 720                         mesh_plink_fsm_restart(sta);
 721                         spin_unlock_bh(&sta->lock);
 722                         break;
 723                 case OPN_ACPT:
 724                 case CNF_ACPT:
 725                 case OPN_RJCT:
 726                 case CNF_RJCT:
 727                         llid = sta->llid;
 728                         reason = sta->reason;
 729                         spin_unlock_bh(&sta->lock);
 730                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr,
 731                                             llid, plid, reason);
 732                         break;
 733                 default:
 734                         spin_unlock_bh(&sta->lock);
 735                 }
 736                 break;
 737         default:
 738                 /* should not get here, PLINK_BLOCKED is dealt with at the
 739                  * beggining of the function
 740                  */
 741                 spin_unlock_bh(&sta->lock);
 742                 break;
 743         }
 744
 745         rcu_read_unlock();
 746 }