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                         sdata->u.mesh.vendor_ie_len);
 165         struct ieee80211_mgmt *mgmt;
 166         bool include_plid = false;
 167         static const u8 meshpeeringproto[] = { 0x00, 0x0F, 0xAC, 0x2A };
 168         u8 *pos;
 169         int ie_len;
 170
 171         if (!skb)
 172                 return -1;
 173         skb_reserve(skb, local->hw.extra_tx_headroom);
 174         /* 25 is the size of the common mgmt part (24) plus the size of the
 175          * common action part (1)
 176          */
 177         mgmt = (struct ieee80211_mgmt *)
 178                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
 179         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
 180         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 181                                           IEEE80211_STYPE_ACTION);
 182         memcpy(mgmt->da, da, ETH_ALEN);
 183         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 184         /* BSSID is left zeroed, wildcard value */
 185         mgmt->u.action.category = WLAN_CATEGORY_MESH_PLINK;
 186         mgmt->u.action.u.plink_action.action_code = action;
 187
 188         if (action == PLINK_CLOSE)
 189                 mgmt->u.action.u.plink_action.aux = reason;
 190         else {
 191                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
 192                 if (action == PLINK_CONFIRM) {
 193                         pos = skb_put(skb, 4);
 194                         /* two-byte status code followed by two-byte AID */
 195                         memset(pos, 0, 2);
 196                         memcpy(pos + 2, &plid, 2);
 197                 }
 198                 mesh_mgmt_ies_add(skb, sdata);
 199         }
 200
 201         /* Add Peer Link Management element */
 202         switch (action) {
 203         case PLINK_OPEN:
 204                 ie_len = 6;
 205                 break;
 206         case PLINK_CONFIRM:
 207                 ie_len = 8;
 208                 include_plid = true;
 209                 break;
 210         case PLINK_CLOSE:
 211         default:
 212                 if (!plid)
 213                         ie_len = 8;
 214                 else {
 215                         ie_len = 10;
 216                         include_plid = true;
 217                 }
 218                 break;
 219         }
 220
 221         pos = skb_put(skb, 2 + ie_len);
 222         *pos++ = WLAN_EID_PEER_LINK;
 223         *pos++ = ie_len;
 224         memcpy(pos, meshpeeringproto, sizeof(meshpeeringproto));
 225         pos += 4;
 226         memcpy(pos, &llid, 2);
 227         if (include_plid) {
 228                 pos += 2;
 229                 memcpy(pos, &plid, 2);
 230         }
 231         if (action == PLINK_CLOSE) {
 232                 pos += 2;
 233                 memcpy(pos, &reason, 2);
 234         }
 235
 236         ieee80211_tx_skb(sdata, skb);
 237         return 0;
 238 }
 239
 240 void mesh_neighbour_update(u8 *hw_addr, u32 rates, struct ieee80211_sub_if_data *sdata,
 241                            bool peer_accepting_plinks)
 242 {
 243         struct ieee80211_local *local = sdata->local;
 244         struct sta_info *sta;
 245
 246         rcu_read_lock();
 247
 248         sta = sta_info_get(sdata, hw_addr);
 249         if (!sta) {
 250                 rcu_read_unlock();
 251
 252                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
 253                 if (!sta)
 254                         return;
 255                 if (sta_info_insert_rcu(sta)) {
 256                         rcu_read_unlock();
 257                         return;
 258                 }
 259         }
 260
 261         sta->last_rx = jiffies;
 262         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
 263         if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN &&
 264                         sdata->u.mesh.accepting_plinks &&
 265                         sdata->u.mesh.mshcfg.auto_open_plinks)
 266                 mesh_plink_open(sta);
 267
 268         rcu_read_unlock();
 269 }
 270
 271 static void mesh_plink_timer(unsigned long data)
 272 {
 273         struct sta_info *sta;
 274         __le16 llid, plid, reason;
 275         struct ieee80211_sub_if_data *sdata;
 276
 277         /*
 278          * This STA is valid because sta_info_destroy() will
 279          * del_timer_sync() this timer after having made sure
 280          * it cannot be readded (by deleting the plink.)
 281          */
 282         sta = (struct sta_info *) data;
 283
 284         if (sta->sdata->local->quiescing) {
 285                 sta->plink_timer_was_running = true;
 286                 return;
 287         }
 288
 289         spin_lock_bh(&sta->lock);
 290         if (sta->ignore_plink_timer) {
 291                 sta->ignore_plink_timer = false;
 292                 spin_unlock_bh(&sta->lock);
 293                 return;
 294         }
 295         mpl_dbg("Mesh plink timer for %pM fired on state %d\n",
 296                 sta->sta.addr, sta->plink_state);
 297         reason = 0;
 298         llid = sta->llid;
 299         plid = sta->plid;
 300         sdata = sta->sdata;
 301
 302         switch (sta->plink_state) {
 303         case PLINK_OPN_RCVD:
 304         case PLINK_OPN_SNT:
 305                 /* retry timer */
 306                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
 307                         u32 rand;
 308                         mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n",
 309                                 sta->sta.addr, sta->plink_retries,
 310                                 sta->plink_timeout);
 311                         get_random_bytes(&rand, sizeof(u32));
 312                         sta->plink_timeout = sta->plink_timeout +
 313                                              rand % sta->plink_timeout;
 314                         ++sta->plink_retries;
 315                         mod_plink_timer(sta, sta->plink_timeout);
 316                         spin_unlock_bh(&sta->lock);
 317                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
 318                                             0, 0);
 319                         break;
 320                 }
 321                 reason = cpu_to_le16(MESH_MAX_RETRIES);
 322                 /* fall through on else */
 323         case PLINK_CNF_RCVD:
 324                 /* confirm timer */
 325                 if (!reason)
 326                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
 327                 sta->plink_state = PLINK_HOLDING;
 328                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 329                 spin_unlock_bh(&sta->lock);
 330                 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid,
 331                                     reason);
 332                 break;
 333         case PLINK_HOLDING:
 334                 /* holding timer */
 335                 del_timer(&sta->plink_timer);
 336                 mesh_plink_fsm_restart(sta);
 337                 spin_unlock_bh(&sta->lock);
 338                 break;
 339         default:
 340                 spin_unlock_bh(&sta->lock);
 341                 break;
 342         }
 343 }
 344
 345 #ifdef CONFIG_PM
 346 void mesh_plink_quiesce(struct sta_info *sta)
 347 {
 348         if (del_timer_sync(&sta->plink_timer))
 349                 sta->plink_timer_was_running = true;
 350 }
 351
 352 void mesh_plink_restart(struct sta_info *sta)
 353 {
 354         if (sta->plink_timer_was_running) {
 355                 add_timer(&sta->plink_timer);
 356                 sta->plink_timer_was_running = false;
 357         }
 358 }
 359 #endif
 360
 361 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
 362 {
 363         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
 364         sta->plink_timer.data = (unsigned long) sta;
 365         sta->plink_timer.function = mesh_plink_timer;
 366         sta->plink_timeout = timeout;
 367         add_timer(&sta->plink_timer);
 368 }
 369
 370 int mesh_plink_open(struct sta_info *sta)
 371 {
 372         __le16 llid;
 373         struct ieee80211_sub_if_data *sdata = sta->sdata;
 374
 375         spin_lock_bh(&sta->lock);
 376         get_random_bytes(&llid, 2);
 377         sta->llid = llid;
 378         if (sta->plink_state != PLINK_LISTEN) {
 379                 spin_unlock_bh(&sta->lock);
 380                 return -EBUSY;
 381         }
 382         sta->plink_state = PLINK_OPN_SNT;
 383         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 384         spin_unlock_bh(&sta->lock);
 385         mpl_dbg("Mesh plink: starting establishment with %pM\n",
 386                 sta->sta.addr);
 387
 388         return mesh_plink_frame_tx(sdata, PLINK_OPEN,
 389                                    sta->sta.addr, llid, 0, 0);
 390 }
 391
 392 void mesh_plink_block(struct sta_info *sta)
 393 {
 394         struct ieee80211_sub_if_data *sdata = sta->sdata;
 395         bool deactivated;
 396
 397         spin_lock_bh(&sta->lock);
 398         deactivated = __mesh_plink_deactivate(sta);
 399         sta->plink_state = PLINK_BLOCKED;
 400         spin_unlock_bh(&sta->lock);
 401
 402         if (deactivated)
 403                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 404 }
 405
 406
 407 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
 408                          size_t len, struct ieee80211_rx_status *rx_status)
 409 {
 410         struct ieee80211_local *local = sdata->local;
 411         struct ieee802_11_elems elems;
 412         struct sta_info *sta;
 413         enum plink_event event;
 414         enum plink_frame_type ftype;
 415         size_t baselen;
 416         bool deactivated, matches_local = true;
 417         u8 ie_len;
 418         u8 *baseaddr;
 419         __le16 plid, llid, reason;
 420 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 421         static const char *mplstates[] = {
 422                 [PLINK_LISTEN] = "LISTEN",
 423                 [PLINK_OPN_SNT] = "OPN-SNT",
 424                 [PLINK_OPN_RCVD] = "OPN-RCVD",
 425                 [PLINK_CNF_RCVD] = "CNF_RCVD",
 426                 [PLINK_ESTAB] = "ESTAB",
 427                 [PLINK_HOLDING] = "HOLDING",
 428                 [PLINK_BLOCKED] = "BLOCKED"
 429         };
 430 #endif
 431
 432         /* need action_code, aux */
 433         if (len < IEEE80211_MIN_ACTION_SIZE + 3)
 434                 return;
 435
 436         if (is_multicast_ether_addr(mgmt->da)) {
 437                 mpl_dbg("Mesh plink: ignore frame from multicast address");
 438                 return;
 439         }
 440
 441         baseaddr = mgmt->u.action.u.plink_action.variable;
 442         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
 443         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
 444                 baseaddr += 4;
 445                 baselen += 4;
 446         }
 447         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
 448         if (!elems.peer_link) {
 449                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
 450                 return;
 451         }
 452
 453         ftype = mgmt->u.action.u.plink_action.action_code;
 454         ie_len = elems.peer_link_len;
 455         if ((ftype == PLINK_OPEN && ie_len != 6) ||
 456             (ftype == PLINK_CONFIRM && ie_len != 8) ||
 457             (ftype == PLINK_CLOSE && ie_len != 8 && ie_len != 10)) {
 458                 mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n",
 459                     ftype, ie_len);
 460                 return;
 461         }
 462
 463         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
 464                 mpl_dbg("Mesh plink: missing necessary ie\n");
 465                 return;
 466         }
 467         /* Note the lines below are correct, the llid in the frame is the plid
 468          * from the point of view of this host.
 469          */
 470         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
 471         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 10))
 472                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
 473
 474         rcu_read_lock();
 475
 476         sta = sta_info_get(sdata, mgmt->sa);
 477         if (!sta && ftype != PLINK_OPEN) {
 478                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
 479                 rcu_read_unlock();
 480                 return;
 481         }
 482
 483         if (sta && sta->plink_state == PLINK_BLOCKED) {
 484                 rcu_read_unlock();
 485                 return;
 486         }
 487
 488         /* Now we will figure out the appropriate event... */
 489         event = PLINK_UNDEFINED;
 490         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) {
 491                 matches_local = false;
 492                 switch (ftype) {
 493                 case PLINK_OPEN:
 494                         event = OPN_RJCT;
 495                         break;
 496                 case PLINK_CONFIRM:
 497                         event = CNF_RJCT;
 498                         break;
 499                 case PLINK_CLOSE:
 500                         /* avoid warning */
 501                         break;
 502                 }
 503         }
 504
 505         if (!sta && !matches_local) {
 506                 rcu_read_unlock();
 507                 reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 508                 llid = 0;
 509                 mesh_plink_frame_tx(sdata, PLINK_CLOSE, mgmt->sa, llid,
 510                                     plid, reason);
 511                 return;
 512         } else if (!sta) {
 513                 /* ftype == PLINK_OPEN */
 514                 u32 rates;
 515
 516                 rcu_read_unlock();
 517
 518                 if (!mesh_plink_free_count(sdata)) {
 519                         mpl_dbg("Mesh plink error: no more free plinks\n");
 520                         return;
 521                 }
 522
 523                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
 524                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
 525                 if (!sta) {
 526                         mpl_dbg("Mesh plink error: plink table full\n");
 527                         return;
 528                 }
 529                 if (sta_info_insert_rcu(sta)) {
 530                         rcu_read_unlock();
 531                         return;
 532                 }
 533                 event = OPN_ACPT;
 534                 spin_lock_bh(&sta->lock);
 535         } else if (matches_local) {
 536                 spin_lock_bh(&sta->lock);
 537                 switch (ftype) {
 538                 case PLINK_OPEN:
 539                         if (!mesh_plink_free_count(sdata) ||
 540                             (sta->plid && sta->plid != plid))
 541                                 event = OPN_IGNR;
 542                         else
 543                                 event = OPN_ACPT;
 544                         break;
 545                 case PLINK_CONFIRM:
 546                         if (!mesh_plink_free_count(sdata) ||
 547                             (sta->llid != llid || sta->plid != plid))
 548                                 event = CNF_IGNR;
 549                         else
 550                                 event = CNF_ACPT;
 551                         break;
 552                 case PLINK_CLOSE:
 553                         if (sta->plink_state == PLINK_ESTAB)
 554                                 /* Do not check for llid or plid. This does not
 555                                  * follow the standard but since multiple plinks
 556                                  * per sta are not supported, it is necessary in
 557                                  * order to avoid a livelock when MP A sees an
 558                                  * establish peer link to MP B but MP B does not
 559                                  * see it. This can be caused by a timeout in
 560                                  * B's peer link establishment or B beign
 561                                  * restarted.
 562                                  */
 563                                 event = CLS_ACPT;
 564                         else if (sta->plid != plid)
 565                                 event = CLS_IGNR;
 566                         else if (ie_len == 7 && sta->llid != llid)
 567                                 event = CLS_IGNR;
 568                         else
 569                                 event = CLS_ACPT;
 570                         break;
 571                 default:
 572                         mpl_dbg("Mesh plink: unknown frame subtype\n");
 573                         spin_unlock_bh(&sta->lock);
 574                         rcu_read_unlock();
 575                         return;
 576                 }
 577         } else {
 578                 spin_lock_bh(&sta->lock);
 579         }
 580
 581         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
 582                 mgmt->sa, mplstates[sta->plink_state],
 583                 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
 584                 event);
 585         reason = 0;
 586         switch (sta->plink_state) {
 587                 /* spin_unlock as soon as state is updated at each case */
 588         case PLINK_LISTEN:
 589                 switch (event) {
 590                 case CLS_ACPT:
 591                         mesh_plink_fsm_restart(sta);
 592                         spin_unlock_bh(&sta->lock);
 593                         break;
 594                 case OPN_ACPT:
 595                         sta->plink_state = PLINK_OPN_RCVD;
 596                         sta->plid = plid;
 597                         get_random_bytes(&llid, 2);
 598                         sta->llid = llid;
 599                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 600                         spin_unlock_bh(&sta->lock);
 601                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
 602                                             0, 0);
 603                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr,
 604                                             llid, plid, 0);
 605                         break;
 606                 default:
 607                         spin_unlock_bh(&sta->lock);
 608                         break;
 609                 }
 610                 break;
 611
 612         case PLINK_OPN_SNT:
 613                 switch (event) {
 614                 case OPN_RJCT:
 615                 case CNF_RJCT:
 616                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 617                 case CLS_ACPT:
 618                         if (!reason)
 619                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 620                         sta->reason = reason;
 621                         sta->plink_state = PLINK_HOLDING;
 622                         if (!mod_plink_timer(sta,
 623                                              dot11MeshHoldingTimeout(sdata)))
 624                                 sta->ignore_plink_timer = true;
 625
 626                         llid = sta->llid;
 627                         spin_unlock_bh(&sta->lock);
 628                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 629                                             plid, reason);
 630                         break;
 631                 case OPN_ACPT:
 632                         /* retry timer is left untouched */
 633                         sta->plink_state = PLINK_OPN_RCVD;
 634                         sta->plid = plid;
 635                         llid = sta->llid;
 636                         spin_unlock_bh(&sta->lock);
 637                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 638                                             plid, 0);
 639                         break;
 640                 case CNF_ACPT:
 641                         sta->plink_state = PLINK_CNF_RCVD;
 642                         if (!mod_plink_timer(sta,
 643                                              dot11MeshConfirmTimeout(sdata)))
 644                                 sta->ignore_plink_timer = true;
 645
 646                         spin_unlock_bh(&sta->lock);
 647                         break;
 648                 default:
 649                         spin_unlock_bh(&sta->lock);
 650                         break;
 651                 }
 652                 break;
 653
 654         case PLINK_OPN_RCVD:
 655                 switch (event) {
 656                 case OPN_RJCT:
 657                 case CNF_RJCT:
 658                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 659                 case CLS_ACPT:
 660                         if (!reason)
 661                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 662                         sta->reason = reason;
 663                         sta->plink_state = PLINK_HOLDING;
 664                         if (!mod_plink_timer(sta,
 665                                              dot11MeshHoldingTimeout(sdata)))
 666                                 sta->ignore_plink_timer = true;
 667
 668                         llid = sta->llid;
 669                         spin_unlock_bh(&sta->lock);
 670                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 671                                             plid, reason);
 672                         break;
 673                 case OPN_ACPT:
 674                         llid = sta->llid;
 675                         spin_unlock_bh(&sta->lock);
 676                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 677                                             plid, 0);
 678                         break;
 679                 case CNF_ACPT:
 680                         del_timer(&sta->plink_timer);
 681                         sta->plink_state = PLINK_ESTAB;
 682                         spin_unlock_bh(&sta->lock);
 683                         mesh_plink_inc_estab_count(sdata);
 684                         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 685                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
 686                                 sta->sta.addr);
 687                         break;
 688                 default:
 689                         spin_unlock_bh(&sta->lock);
 690                         break;
 691                 }
 692                 break;
 693
 694         case PLINK_CNF_RCVD:
 695                 switch (event) {
 696                 case OPN_RJCT:
 697                 case CNF_RJCT:
 698                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 699                 case CLS_ACPT:
 700                         if (!reason)
 701                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 702                         sta->reason = reason;
 703                         sta->plink_state = PLINK_HOLDING;
 704                         if (!mod_plink_timer(sta,
 705                                              dot11MeshHoldingTimeout(sdata)))
 706                                 sta->ignore_plink_timer = true;
 707
 708                         llid = sta->llid;
 709                         spin_unlock_bh(&sta->lock);
 710                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 711                                             plid, reason);
 712                         break;
 713                 case OPN_ACPT:
 714                         del_timer(&sta->plink_timer);
 715                         sta->plink_state = PLINK_ESTAB;
 716                         spin_unlock_bh(&sta->lock);
 717                         mesh_plink_inc_estab_count(sdata);
 718                         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 719                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
 720                                 sta->sta.addr);
 721                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 722                                             plid, 0);
 723                         break;
 724                 default:
 725                         spin_unlock_bh(&sta->lock);
 726                         break;
 727                 }
 728                 break;
 729
 730         case PLINK_ESTAB:
 731                 switch (event) {
 732                 case CLS_ACPT:
 733                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
 734                         sta->reason = reason;
 735                         deactivated = __mesh_plink_deactivate(sta);
 736                         sta->plink_state = PLINK_HOLDING;
 737                         llid = sta->llid;
 738                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 739                         spin_unlock_bh(&sta->lock);
 740                         if (deactivated)
 741                                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 742                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 743                                             plid, reason);
 744                         break;
 745                 case OPN_ACPT:
 746                         llid = sta->llid;
 747                         spin_unlock_bh(&sta->lock);
 748                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 749                                             plid, 0);
 750                         break;
 751                 default:
 752                         spin_unlock_bh(&sta->lock);
 753                         break;
 754                 }
 755                 break;
 756         case PLINK_HOLDING:
 757                 switch (event) {
 758                 case CLS_ACPT:
 759                         if (del_timer(&sta->plink_timer))
 760                                 sta->ignore_plink_timer = 1;
 761                         mesh_plink_fsm_restart(sta);
 762                         spin_unlock_bh(&sta->lock);
 763                         break;
 764                 case OPN_ACPT:
 765                 case CNF_ACPT:
 766                 case OPN_RJCT:
 767                 case CNF_RJCT:
 768                         llid = sta->llid;
 769                         reason = sta->reason;
 770                         spin_unlock_bh(&sta->lock);
 771                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr,
 772                                             llid, plid, reason);
 773                         break;
 774                 default:
 775                         spin_unlock_bh(&sta->lock);
 776                 }
 777                 break;
 778         default:
 779                 /* should not get here, PLINK_BLOCKED is dealt with at the
 780                  * beginning of the function
 781                  */
 782                 spin_unlock_bh(&sta->lock);
 783                 break;
 784         }
 785
 786         rcu_read_unlock();
 787 }