err.no Git - linux-2.6/blob - 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 "ieee80211_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 IEEE80211_FC(type, stype) cpu_to_le16(type | stype)
  22 #define PLINK_GET_FRAME_SUBTYPE(p) (p)
  23 #define PLINK_GET_LLID(p) (p + 1)
  24 #define PLINK_GET_PLID(p) (p + 3)
  25
  26 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
  27                                 jiffies + HZ * t / 1000))
  28
  29 /* Peer link cancel reasons, all subject to ANA approval */
  30 #define MESH_LINK_CANCELLED                     2
  31 #define MESH_MAX_NEIGHBORS                      3
  32 #define MESH_CAPABILITY_POLICY_VIOLATION        4
  33 #define MESH_CLOSE_RCVD                         5
  34 #define MESH_MAX_RETRIES                        6
  35 #define MESH_CONFIRM_TIMEOUT                    7
  36 #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS  8
  37 #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9
  38 #define MESH_SECURITY_FAILED_VERIFICATION       10
  39
  40 #define dot11MeshMaxRetries(s) (s->u.sta.mshcfg.dot11MeshMaxRetries)
  41 #define dot11MeshRetryTimeout(s) (s->u.sta.mshcfg.dot11MeshRetryTimeout)
  42 #define dot11MeshConfirmTimeout(s) (s->u.sta.mshcfg.dot11MeshConfirmTimeout)
  43 #define dot11MeshHoldingTimeout(s) (s->u.sta.mshcfg.dot11MeshHoldingTimeout)
  44 #define dot11MeshMaxPeerLinks(s) (s->u.sta.mshcfg.dot11MeshMaxPeerLinks)
  45
  46 enum plink_frame_type {
  47         PLINK_OPEN = 0,
  48         PLINK_CONFIRM,
  49         PLINK_CLOSE
  50 };
  51
  52 enum plink_event {
  53         PLINK_UNDEFINED,
  54         OPN_ACPT,
  55         OPN_RJCT,
  56         OPN_IGNR,
  57         CNF_ACPT,
  58         CNF_RJCT,
  59         CNF_IGNR,
  60         CLS_ACPT,
  61         CLS_IGNR
  62 };
  63
  64 static inline
  65 void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
  66 {
  67         atomic_inc(&sdata->u.sta.mshstats.estab_plinks);
  68         mesh_accept_plinks_update(sdata);
  69 }
  70
  71 static inline
  72 void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
  73 {
  74         atomic_dec(&sdata->u.sta.mshstats.estab_plinks);
  75         mesh_accept_plinks_update(sdata);
  76 }
  77
  78 /**
  79  * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
  80  *
  81  * @sta: mes peer link to restart
  82  *
  83  * Locking: this function must be called holding sta->plink_lock
  84  */
  85 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
  86 {
  87         sta->plink_state = LISTEN;
  88         sta->llid = sta->plid = sta->reason = sta->plink_retries = 0;
  89 }
  90
  91 static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
  92                                          u8 *hw_addr, u64 rates)
  93 {
  94         struct ieee80211_local *local = sdata->local;
  95         struct sta_info *sta;
  96
  97         if (local->num_sta >= MESH_MAX_PLINKS)
  98                 return NULL;
  99
 100         sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC);
 101         if (!sta)
 102                 return NULL;
 103
 104         sta->flags |= WLAN_STA_AUTHORIZED;
 105         sta->supp_rates[local->hw.conf.channel->band] = rates;
 106
 107         return sta;
 108 }
 109
 110 /**
 111  * mesh_plink_deactivate - deactivate mesh peer link
 112  *
 113  * @sta: mesh peer link to deactivate
 114  *
 115  * All mesh paths with this peer as next hop will be flushed
 116  *
 117  * Locking: the caller must hold sta->plink_lock
 118  */
 119 static void __mesh_plink_deactivate(struct sta_info *sta)
 120 {
 121         struct ieee80211_sub_if_data *sdata = sta->sdata;
 122
 123         if (sta->plink_state == ESTAB)
 124                 mesh_plink_dec_estab_count(sdata);
 125         sta->plink_state = BLOCKED;
 126         mesh_path_flush_by_nexthop(sta);
 127 }
 128
 129 /**
 130  * __mesh_plink_deactivate - deactivate mesh peer link
 131  *
 132  * @sta: mesh peer link to deactivate
 133  *
 134  * All mesh paths with this peer as next hop will be flushed
 135  */
 136 void mesh_plink_deactivate(struct sta_info *sta)
 137 {
 138         spin_lock_bh(&sta->plink_lock);
 139         __mesh_plink_deactivate(sta);
 140         spin_unlock_bh(&sta->plink_lock);
 141 }
 142
 143 static int mesh_plink_frame_tx(struct net_device *dev,
 144                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
 145                 __le16 reason) {
 146         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 147         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 148         struct ieee80211_mgmt *mgmt;
 149         bool include_plid = false;
 150         u8 *pos;
 151         int ie_len;
 152
 153         if (!skb)
 154                 return -1;
 155         skb_reserve(skb, local->hw.extra_tx_headroom);
 156         /* 25 is the size of the common mgmt part (24) plus the size of the
 157          * common action part (1)
 158          */
 159         mgmt = (struct ieee80211_mgmt *)
 160                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
 161         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
 162         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 163                                            IEEE80211_STYPE_ACTION);
 164         memcpy(mgmt->da, da, ETH_ALEN);
 165         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 166         /* BSSID is left zeroed, wildcard value */
 167         mgmt->u.action.category = PLINK_CATEGORY;
 168         mgmt->u.action.u.plink_action.action_code = action;
 169
 170         if (action == PLINK_CLOSE)
 171                 mgmt->u.action.u.plink_action.aux = reason;
 172         else {
 173                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
 174                 if (action == PLINK_CONFIRM) {
 175                         pos = skb_put(skb, 4);
 176                         /* two-byte status code followed by two-byte AID */
 177                         memset(pos, 0, 4);
 178                 }
 179                 mesh_mgmt_ies_add(skb, dev);
 180         }
 181
 182         /* Add Peer Link Management element */
 183         switch (action) {
 184         case PLINK_OPEN:
 185                 ie_len = 3;
 186                 break;
 187         case PLINK_CONFIRM:
 188                 ie_len = 5;
 189                 include_plid = true;
 190                 break;
 191         case PLINK_CLOSE:
 192         default:
 193                 if (!plid)
 194                         ie_len = 5;
 195                 else {
 196                         ie_len = 7;
 197                         include_plid = true;
 198                 }
 199                 break;
 200         }
 201
 202         pos = skb_put(skb, 2 + ie_len);
 203         *pos++ = WLAN_EID_PEER_LINK;
 204         *pos++ = ie_len;
 205         *pos++ = action;
 206         memcpy(pos, &llid, 2);
 207         if (include_plid) {
 208                 pos += 2;
 209                 memcpy(pos, &plid, 2);
 210         }
 211         if (action == PLINK_CLOSE) {
 212                 pos += 2;
 213                 memcpy(pos, &reason, 2);
 214         }
 215
 216         ieee80211_sta_tx(dev, skb, 0);
 217         return 0;
 218 }
 219
 220 void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev,
 221                            bool peer_accepting_plinks)
 222 {
 223         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 224         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 225         struct sta_info *sta;
 226
 227         rcu_read_lock();
 228
 229         sta = sta_info_get(local, hw_addr);
 230         if (!sta) {
 231                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
 232                 if (!sta) {
 233                         rcu_read_unlock();
 234                         return;
 235                 }
 236                 if (sta_info_insert(sta)) {
 237                         sta_info_destroy(sta);
 238                         rcu_read_unlock();
 239                         return;
 240                 }
 241         }
 242
 243         sta->last_rx = jiffies;
 244         sta->supp_rates[local->hw.conf.channel->band] = rates;
 245         if (peer_accepting_plinks && sta->plink_state == LISTEN &&
 246                         sdata->u.sta.accepting_plinks &&
 247                         sdata->u.sta.mshcfg.auto_open_plinks)
 248                 mesh_plink_open(sta);
 249
 250         rcu_read_unlock();
 251 }
 252
 253 static void mesh_plink_timer(unsigned long data)
 254 {
 255         struct sta_info *sta;
 256         __le16 llid, plid, reason;
 257         struct net_device *dev = NULL;
 258         struct ieee80211_sub_if_data *sdata;
 259 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 260         DECLARE_MAC_BUF(mac);
 261 #endif
 262
 263         /*
 264          * This STA is valid because sta_info_destroy() will
 265          * del_timer_sync() this timer after having made sure
 266          * it cannot be readded (by deleting the plink.)
 267          */
 268         sta = (struct sta_info *) data;
 269
 270         spin_lock_bh(&sta->plink_lock);
 271         if (sta->ignore_plink_timer) {
 272                 sta->ignore_plink_timer = false;
 273                 spin_unlock_bh(&sta->plink_lock);
 274                 return;
 275         }
 276         mpl_dbg("Mesh plink timer for %s fired on state %d\n",
 277                         print_mac(mac, sta->addr), sta->plink_state);
 278         reason = 0;
 279         llid = sta->llid;
 280         plid = sta->plid;
 281         sdata = sta->sdata;
 282         dev = sdata->dev;
 283
 284         switch (sta->plink_state) {
 285         case OPN_RCVD:
 286         case OPN_SNT:
 287                 /* retry timer */
 288                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
 289                         u32 rand;
 290                         mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n",
 291                                         print_mac(mac, sta->addr),
 292                                         sta->plink_retries, sta->plink_timeout);
 293                         get_random_bytes(&rand, sizeof(u32));
 294                         sta->plink_timeout = sta->plink_timeout +
 295                                              rand % sta->plink_timeout;
 296                         ++sta->plink_retries;
 297                         mod_plink_timer(sta, sta->plink_timeout);
 298                         spin_unlock_bh(&sta->plink_lock);
 299                         mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid,
 300                                             0, 0);
 301                         break;
 302                 }
 303                 reason = cpu_to_le16(MESH_MAX_RETRIES);
 304                 /* fall through on else */
 305         case CNF_RCVD:
 306                 /* confirm timer */
 307                 if (!reason)
 308                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
 309                 sta->plink_state = HOLDING;
 310                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 311                 spin_unlock_bh(&sta->plink_lock);
 312                 mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid,
 313                                     reason);
 314                 break;
 315         case HOLDING:
 316                 /* holding timer */
 317                 del_timer(&sta->plink_timer);
 318                 mesh_plink_fsm_restart(sta);
 319                 spin_unlock_bh(&sta->plink_lock);
 320                 break;
 321         default:
 322                 spin_unlock_bh(&sta->plink_lock);
 323                 break;
 324         }
 325 }
 326
 327 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
 328 {
 329         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
 330         sta->plink_timer.data = (unsigned long) sta;
 331         sta->plink_timer.function = mesh_plink_timer;
 332         sta->plink_timeout = timeout;
 333         add_timer(&sta->plink_timer);
 334 }
 335
 336 int mesh_plink_open(struct sta_info *sta)
 337 {
 338         __le16 llid;
 339         struct ieee80211_sub_if_data *sdata = sta->sdata;
 340 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 341         DECLARE_MAC_BUF(mac);
 342 #endif
 343
 344         spin_lock_bh(&sta->plink_lock);
 345         get_random_bytes(&llid, 2);
 346         sta->llid = llid;
 347         if (sta->plink_state != LISTEN) {
 348                 spin_unlock_bh(&sta->plink_lock);
 349                 return -EBUSY;
 350         }
 351         sta->plink_state = OPN_SNT;
 352         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 353         spin_unlock_bh(&sta->plink_lock);
 354         mpl_dbg("Mesh plink: starting establishment with %s\n",
 355                 print_mac(mac, sta->addr));
 356
 357         return mesh_plink_frame_tx(sdata->dev, PLINK_OPEN,
 358                                    sta->addr, llid, 0, 0);
 359 }
 360
 361 void mesh_plink_block(struct sta_info *sta)
 362 {
 363 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 364         DECLARE_MAC_BUF(mac);
 365 #endif
 366
 367         spin_lock_bh(&sta->plink_lock);
 368         __mesh_plink_deactivate(sta);
 369         sta->plink_state = BLOCKED;
 370         spin_unlock_bh(&sta->plink_lock);
 371 }
 372
 373 int mesh_plink_close(struct sta_info *sta)
 374 {
 375         struct ieee80211_sub_if_data *sdata = sta->sdata;
 376         int llid, plid, reason;
 377 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 378         DECLARE_MAC_BUF(mac);
 379 #endif
 380
 381         mpl_dbg("Mesh plink: closing link with %s\n",
 382                         print_mac(mac, sta->addr));
 383         spin_lock_bh(&sta->plink_lock);
 384         sta->reason = cpu_to_le16(MESH_LINK_CANCELLED);
 385         reason = sta->reason;
 386
 387         if (sta->plink_state == LISTEN || sta->plink_state == BLOCKED) {
 388                 mesh_plink_fsm_restart(sta);
 389                 spin_unlock_bh(&sta->plink_lock);
 390                 return 0;
 391         } else if (sta->plink_state == ESTAB) {
 392                 __mesh_plink_deactivate(sta);
 393                 /* The timer should not be running */
 394                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 395         } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
 396                 sta->ignore_plink_timer = true;
 397
 398         sta->plink_state = HOLDING;
 399         llid = sta->llid;
 400         plid = sta->plid;
 401         spin_unlock_bh(&sta->plink_lock);
 402         mesh_plink_frame_tx(sta->sdata->dev, PLINK_CLOSE, sta->addr, llid,
 403                             plid, reason);
 404         return 0;
 405 }
 406
 407 void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt,
 408                          size_t len, struct ieee80211_rx_status *rx_status)
 409 {
 410         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 411         struct ieee80211_local *local = sdata->local;
 412         struct ieee802_11_elems elems;
 413         struct sta_info *sta;
 414         enum plink_event event;
 415         enum plink_frame_type ftype;
 416         size_t baselen;
 417         u8 ie_len;
 418         u8 *baseaddr;
 419         __le16 plid, llid, reason;
 420 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 421         DECLARE_MAC_BUF(mac);
 422 #endif
 423
 424         if (is_multicast_ether_addr(mgmt->da)) {
 425                 mpl_dbg("Mesh plink: ignore frame from multicast address");
 426                 return;
 427         }
 428
 429         baseaddr = mgmt->u.action.u.plink_action.variable;
 430         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
 431         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
 432                 baseaddr += 4;
 433                 baselen -= 4;
 434         }
 435         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
 436         if (!elems.peer_link) {
 437                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
 438                 return;
 439         }
 440
 441         ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link));
 442         ie_len = elems.peer_link_len;
 443         if ((ftype == PLINK_OPEN && ie_len != 3) ||
 444             (ftype == PLINK_CONFIRM && ie_len != 5) ||
 445             (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) {
 446                 mpl_dbg("Mesh plink: incorrect plink ie length\n");
 447                 return;
 448         }
 449
 450         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
 451                 mpl_dbg("Mesh plink: missing necessary ie\n");
 452                 return;
 453         }
 454         /* Note the lines below are correct, the llid in the frame is the plid
 455          * from the point of view of this host.
 456          */
 457         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
 458         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7))
 459                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
 460
 461         rcu_read_lock();
 462
 463         sta = sta_info_get(local, mgmt->sa);
 464         if (!sta && ftype != PLINK_OPEN) {
 465                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
 466                 rcu_read_unlock();
 467                 return;
 468         }
 469
 470         if (sta && sta->plink_state == BLOCKED) {
 471                 rcu_read_unlock();
 472                 return;
 473         }
 474
 475         /* Now we will figure out the appropriate event... */
 476         event = PLINK_UNDEFINED;
 477         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, dev))) {
 478                 switch (ftype) {
 479                 case PLINK_OPEN:
 480                         event = OPN_RJCT;
 481                         break;
 482                 case PLINK_CONFIRM:
 483                         event = CNF_RJCT;
 484                         break;
 485                 case PLINK_CLOSE:
 486                         /* avoid warning */
 487                         break;
 488                 }
 489                 spin_lock_bh(&sta->plink_lock);
 490         } else if (!sta) {
 491                 /* ftype == PLINK_OPEN */
 492                 u64 rates;
 493                 if (!mesh_plink_free_count(sdata)) {
 494                         mpl_dbg("Mesh plink error: no more free plinks\n");
 495                         rcu_read_unlock();
 496                         return;
 497                 }
 498
 499                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
 500                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
 501                 if (!sta) {
 502                         mpl_dbg("Mesh plink error: plink table full\n");
 503                         rcu_read_unlock();
 504                         return;
 505                 }
 506                 if (sta_info_insert(sta)) {
 507                         sta_info_destroy(sta);
 508                         rcu_read_unlock();
 509                         return;
 510                 }
 511                 event = OPN_ACPT;
 512                 spin_lock_bh(&sta->plink_lock);
 513         } else {
 514                 spin_lock_bh(&sta->plink_lock);
 515                 switch (ftype) {
 516                 case PLINK_OPEN:
 517                         if (!mesh_plink_free_count(sdata) ||
 518                             (sta->plid && sta->plid != plid))
 519                                 event = OPN_IGNR;
 520                         else
 521                                 event = OPN_ACPT;
 522                         break;
 523                 case PLINK_CONFIRM:
 524                         if (!mesh_plink_free_count(sdata) ||
 525                             (sta->llid != llid || sta->plid != plid))
 526                                 event = CNF_IGNR;
 527                         else
 528                                 event = CNF_ACPT;
 529                         break;
 530                 case PLINK_CLOSE:
 531                         if (sta->plink_state == ESTAB)
 532                                 /* Do not check for llid or plid. This does not
 533                                  * follow the standard but since multiple plinks
 534                                  * per sta are not supported, it is necessary in
 535                                  * order to avoid a livelock when MP A sees an
 536                                  * establish peer link to MP B but MP B does not
 537                                  * see it. This can be caused by a timeout in
 538                                  * B's peer link establishment or B beign
 539                                  * restarted.
 540                                  */
 541                                 event = CLS_ACPT;
 542                         else if (sta->plid != plid)
 543                                 event = CLS_IGNR;
 544                         else if (ie_len == 7 && sta->llid != llid)
 545                                 event = CLS_IGNR;
 546                         else
 547                                 event = CLS_ACPT;
 548                         break;
 549                 default:
 550                         mpl_dbg("Mesh plink: unknown frame subtype\n");
 551                         spin_unlock_bh(&sta->plink_lock);
 552                         rcu_read_unlock();
 553                         return;
 554                 }
 555         }
 556
 557         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n",
 558                         print_mac(mac, mgmt->sa), sta->plink_state,
 559                         __le16_to_cpu(sta->llid), __le16_to_cpu(sta->plid),
 560                         event);
 561         reason = 0;
 562         switch (sta->plink_state) {
 563                 /* spin_unlock as soon as state is updated at each case */
 564         case LISTEN:
 565                 switch (event) {
 566                 case CLS_ACPT:
 567                         mesh_plink_fsm_restart(sta);
 568                         spin_unlock_bh(&sta->plink_lock);
 569                         break;
 570                 case OPN_ACPT:
 571                         sta->plink_state = OPN_RCVD;
 572                         sta->plid = plid;
 573                         get_random_bytes(&llid, 2);
 574                         sta->llid = llid;
 575                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 576                         spin_unlock_bh(&sta->plink_lock);
 577                         mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid,
 578                                             0, 0);
 579                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr,
 580                                             llid, plid, 0);
 581                         break;
 582                 default:
 583                         spin_unlock_bh(&sta->plink_lock);
 584                         break;
 585                 }
 586                 break;
 587
 588         case OPN_SNT:
 589                 switch (event) {
 590                 case OPN_RJCT:
 591                 case CNF_RJCT:
 592                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 593                 case CLS_ACPT:
 594                         if (!reason)
 595                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 596                         sta->reason = reason;
 597                         sta->plink_state = HOLDING;
 598                         if (!mod_plink_timer(sta,
 599                                              dot11MeshHoldingTimeout(sdata)))
 600                                 sta->ignore_plink_timer = true;
 601
 602                         llid = sta->llid;
 603                         spin_unlock_bh(&sta->plink_lock);
 604                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 605                                             plid, reason);
 606                         break;
 607                 case OPN_ACPT:
 608                         /* retry timer is left untouched */
 609                         sta->plink_state = OPN_RCVD;
 610                         sta->plid = plid;
 611                         llid = sta->llid;
 612                         spin_unlock_bh(&sta->plink_lock);
 613                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 614                                             plid, 0);
 615                         break;
 616                 case CNF_ACPT:
 617                         sta->plink_state = CNF_RCVD;
 618                         if (!mod_plink_timer(sta,
 619                                              dot11MeshConfirmTimeout(sdata)))
 620                                 sta->ignore_plink_timer = true;
 621
 622                         spin_unlock_bh(&sta->plink_lock);
 623                         break;
 624                 default:
 625                         spin_unlock_bh(&sta->plink_lock);
 626                         break;
 627                 }
 628                 break;
 629
 630         case OPN_RCVD:
 631                 switch (event) {
 632                 case OPN_RJCT:
 633                 case CNF_RJCT:
 634                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 635                 case CLS_ACPT:
 636                         if (!reason)
 637                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 638                         sta->reason = reason;
 639                         sta->plink_state = HOLDING;
 640                         if (!mod_plink_timer(sta,
 641                                              dot11MeshHoldingTimeout(sdata)))
 642                                 sta->ignore_plink_timer = true;
 643
 644                         llid = sta->llid;
 645                         spin_unlock_bh(&sta->plink_lock);
 646                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 647                                             plid, reason);
 648                         break;
 649                 case OPN_ACPT:
 650                         llid = sta->llid;
 651                         spin_unlock_bh(&sta->plink_lock);
 652                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 653                                             plid, 0);
 654                         break;
 655                 case CNF_ACPT:
 656                         del_timer(&sta->plink_timer);
 657                         sta->plink_state = ESTAB;
 658                         mesh_plink_inc_estab_count(sdata);
 659                         spin_unlock_bh(&sta->plink_lock);
 660                         mpl_dbg("Mesh plink with %s ESTABLISHED\n",
 661                                         print_mac(mac, sta->addr));
 662                         break;
 663                 default:
 664                         spin_unlock_bh(&sta->plink_lock);
 665                         break;
 666                 }
 667                 break;
 668
 669         case CNF_RCVD:
 670                 switch (event) {
 671                 case OPN_RJCT:
 672                 case CNF_RJCT:
 673                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 674                 case CLS_ACPT:
 675                         if (!reason)
 676                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 677                         sta->reason = reason;
 678                         sta->plink_state = HOLDING;
 679                         if (!mod_plink_timer(sta,
 680                                              dot11MeshHoldingTimeout(sdata)))
 681                                 sta->ignore_plink_timer = true;
 682
 683                         llid = sta->llid;
 684                         spin_unlock_bh(&sta->plink_lock);
 685                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 686                                             plid, reason);
 687                         break;
 688                 case OPN_ACPT:
 689                         del_timer(&sta->plink_timer);
 690                         sta->plink_state = ESTAB;
 691                         mesh_plink_inc_estab_count(sdata);
 692                         spin_unlock_bh(&sta->plink_lock);
 693                         mpl_dbg("Mesh plink with %s ESTABLISHED\n",
 694                                         print_mac(mac, sta->addr));
 695                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 696                                             plid, 0);
 697                         break;
 698                 default:
 699                         spin_unlock_bh(&sta->plink_lock);
 700                         break;
 701                 }
 702                 break;
 703
 704         case ESTAB:
 705                 switch (event) {
 706                 case CLS_ACPT:
 707                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
 708                         sta->reason = reason;
 709                         __mesh_plink_deactivate(sta);
 710                         sta->plink_state = HOLDING;
 711                         llid = sta->llid;
 712                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 713                         spin_unlock_bh(&sta->plink_lock);
 714                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 715                                             plid, reason);
 716                         break;
 717                 case OPN_ACPT:
 718                         llid = sta->llid;
 719                         spin_unlock_bh(&sta->plink_lock);
 720                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 721                                             plid, 0);
 722                         break;
 723                 default:
 724                         spin_unlock_bh(&sta->plink_lock);
 725                         break;
 726                 }
 727                 break;
 728         case HOLDING:
 729                 switch (event) {
 730                 case CLS_ACPT:
 731                         if (del_timer(&sta->plink_timer))
 732                                 sta->ignore_plink_timer = 1;
 733                         mesh_plink_fsm_restart(sta);
 734                         spin_unlock_bh(&sta->plink_lock);
 735                         break;
 736                 case OPN_ACPT:
 737                 case CNF_ACPT:
 738                 case OPN_RJCT:
 739                 case CNF_RJCT:
 740                         llid = sta->llid;
 741                         reason = sta->reason;
 742                         spin_unlock_bh(&sta->plink_lock);
 743                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 744                                             plid, reason);
 745                         break;
 746                 default:
 747                         spin_unlock_bh(&sta->plink_lock);
 748                 }
 749                 break;
 750         default:
 751                 /* should not get here, BLOCKED is dealt with at the beggining
 752                  * of the function
 753                  */
 754                 spin_unlock_bh(&sta->plink_lock);
 755                 break;
 756         }
 757
 758         rcu_read_unlock();
 759 }