SAFE public projects git trees. - safe/jmp/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
  10 #include "ieee80211_i.h"
  11 #include "ieee80211_rate.h"
  12 #include "mesh.h"
  13 #include <linux/random.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->dev);
  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->dev);
  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 /**
  92  * mesh_plink_add - allocate and add a new mesh peer link
  93  *
  94  * @hw_addr: hardware address (ETH_ALEN length)
  95  * @rates: rates the mesh peer supports
  96  * @dev: local mesh interface
  97  *
  98  * The initial state of the new plink is set to LISTEN
  99  *
 100  * Returns: non-NULL on success, ERR_PTR() on error.
 101  */
 102 struct sta_info *mesh_plink_add(u8 *hw_addr, u64 rates, struct net_device *dev)
 103 {
 104         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 105         struct sta_info *sta;
 106
 107         if (memcmp(hw_addr, dev->dev_addr, ETH_ALEN) == 0)
 108                 /* never add ourselves as neighbours */
 109                 return ERR_PTR(-EINVAL);
 110
 111         if (is_multicast_ether_addr(hw_addr))
 112                 return ERR_PTR(-EINVAL);
 113
 114         if (local->num_sta >= MESH_MAX_PLINKS)
 115                 return ERR_PTR(-ENOSPC);
 116
 117         sta = sta_info_add(local, dev, hw_addr, GFP_KERNEL);
 118         if (IS_ERR(sta))
 119                 return sta;
 120
 121         sta->plink_state = LISTEN;
 122         spin_lock_init(&sta->plink_lock);
 123         init_timer(&sta->plink_timer);
 124         sta->flags |= WLAN_STA_AUTHORIZED;
 125         sta->supp_rates[local->hw.conf.channel->band] = rates;
 126         rate_control_rate_init(sta, local);
 127
 128         mesh_accept_plinks_update(dev);
 129
 130         return sta;
 131 }
 132
 133 /**
 134  * mesh_plink_deactivate - deactivate mesh peer link
 135  *
 136  * @sta: mesh peer link to deactivate
 137  *
 138  * All mesh paths with this peer as next hop will be flushed
 139  *
 140  * Locking: the caller must hold sta->plink_lock
 141  */
 142 void mesh_plink_deactivate(struct sta_info *sta)
 143 {
 144         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 145         if (sta->plink_state == ESTAB)
 146                 mesh_plink_dec_estab_count(sdata);
 147         sta->plink_state = BLOCKED;
 148         mesh_path_flush_by_nexthop(sta);
 149 }
 150
 151 static int mesh_plink_frame_tx(struct net_device *dev,
 152                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
 153                 __le16 reason) {
 154         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 155         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 156         struct ieee80211_mgmt *mgmt;
 157         bool include_plid = false;
 158         u8 *pos;
 159         int ie_len;
 160
 161         if (!skb)
 162                 return -1;
 163         skb_reserve(skb, local->hw.extra_tx_headroom);
 164         /* 25 is the size of the common mgmt part (24) plus the size of the
 165          * common action part (1)
 166          */
 167         mgmt = (struct ieee80211_mgmt *)
 168                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
 169         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
 170         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 171                                            IEEE80211_STYPE_ACTION);
 172         memcpy(mgmt->da, da, ETH_ALEN);
 173         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 174         /* BSSID is left zeroed, wildcard value */
 175         mgmt->u.action.category = PLINK_CATEGORY;
 176         mgmt->u.action.u.plink_action.action_code = action;
 177
 178         if (action == PLINK_CLOSE)
 179                 mgmt->u.action.u.plink_action.aux = reason;
 180         else {
 181                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
 182                 if (action == PLINK_CONFIRM) {
 183                         pos = skb_put(skb, 4);
 184                         /* two-byte status code followed by two-byte AID */
 185                         memset(pos, 0, 4);
 186                 }
 187                 mesh_mgmt_ies_add(skb, dev);
 188         }
 189
 190         /* Add Peer Link Management element */
 191         switch (action) {
 192         case PLINK_OPEN:
 193                 ie_len = 3;
 194                 break;
 195         case PLINK_CONFIRM:
 196                 ie_len = 5;
 197                 include_plid = true;
 198                 break;
 199         case PLINK_CLOSE:
 200         default:
 201                 if (!plid)
 202                         ie_len = 5;
 203                 else {
 204                         ie_len = 7;
 205                         include_plid = true;
 206                 }
 207                 break;
 208         }
 209
 210         pos = skb_put(skb, 2 + ie_len);
 211         *pos++ = WLAN_EID_PEER_LINK;
 212         *pos++ = ie_len;
 213         *pos++ = action;
 214         memcpy(pos, &llid, 2);
 215         if (include_plid) {
 216                 pos += 2;
 217                 memcpy(pos, &plid, 2);
 218         }
 219         if (action == PLINK_CLOSE) {
 220                 pos += 2;
 221                 memcpy(pos, &reason, 2);
 222         }
 223
 224         ieee80211_sta_tx(dev, skb, 0);
 225         return 0;
 226 }
 227
 228 void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev,
 229                            bool peer_accepting_plinks)
 230 {
 231         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 232         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 233         struct sta_info *sta;
 234
 235         sta = sta_info_get(local, hw_addr);
 236         if (!sta) {
 237                 sta = mesh_plink_add(hw_addr, rates, dev);
 238                 if (IS_ERR(sta))
 239                         return;
 240         }
 241
 242         sta->last_rx = jiffies;
 243         sta->supp_rates[local->hw.conf.channel->band] = rates;
 244         if (peer_accepting_plinks && sta->plink_state == LISTEN &&
 245                         sdata->u.sta.accepting_plinks &&
 246                         sdata->u.sta.mshcfg.auto_open_plinks)
 247                 mesh_plink_open(sta);
 248
 249         sta_info_put(sta);
 250 }
 251
 252 static void mesh_plink_timer(unsigned long data)
 253 {
 254         struct sta_info *sta;
 255         __le16 llid, plid, reason;
 256         struct net_device *dev = NULL;
 257         struct ieee80211_sub_if_data *sdata;
 258 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 259         DECLARE_MAC_BUF(mac);
 260 #endif
 261
 262         sta = (struct sta_info *) data;
 263
 264         spin_lock_bh(&sta->plink_lock);
 265         if (sta->ignore_plink_timer) {
 266                 sta->ignore_plink_timer = false;
 267                 spin_unlock_bh(&sta->plink_lock);
 268                 return;
 269         }
 270         mpl_dbg("Mesh plink timer for %s fired on state %d\n",
 271                         print_mac(mac, sta->addr), sta->plink_state);
 272         reason = 0;
 273         llid = sta->llid;
 274         plid = sta->plid;
 275         dev = sta->dev;
 276         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 277
 278         switch (sta->plink_state) {
 279         case OPN_RCVD:
 280         case OPN_SNT:
 281                 /* retry timer */
 282                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
 283                         u32 rand;
 284                         mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n",
 285                                         print_mac(mac, sta->addr),
 286                                         sta->plink_retries, sta->plink_timeout);
 287                         get_random_bytes(&rand, sizeof(u32));
 288                         sta->plink_timeout = sta->plink_timeout +
 289                                              rand % sta->plink_timeout;
 290                         ++sta->plink_retries;
 291                         if (!mod_plink_timer(sta, sta->plink_timeout))
 292                                 __sta_info_get(sta);
 293                         spin_unlock_bh(&sta->plink_lock);
 294                         mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid,
 295                                             0, 0);
 296                         break;
 297                 }
 298                 reason = cpu_to_le16(MESH_MAX_RETRIES);
 299                 /* fall through on else */
 300         case CNF_RCVD:
 301                 /* confirm timer */
 302                 if (!reason)
 303                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
 304                 sta->plink_state = HOLDING;
 305                 if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
 306                         __sta_info_get(sta);
 307                 spin_unlock_bh(&sta->plink_lock);
 308                 mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid,
 309                                     reason);
 310                 break;
 311         case HOLDING:
 312                 /* holding timer */
 313                 if (del_timer(&sta->plink_timer))
 314                         sta_info_put(sta);
 315                 mesh_plink_fsm_restart(sta);
 316                 spin_unlock_bh(&sta->plink_lock);
 317                 break;
 318         default:
 319                 spin_unlock_bh(&sta->plink_lock);
 320                 break;
 321         }
 322
 323         sta_info_put(sta);
 324 }
 325
 326 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
 327 {
 328         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
 329         sta->plink_timer.data = (unsigned long) sta;
 330         sta->plink_timer.function = mesh_plink_timer;
 331         sta->plink_timeout = timeout;
 332         __sta_info_get(sta);
 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 = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 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                 sta_info_put(sta);
 350                 return -EBUSY;
 351         }
 352         sta->plink_state = OPN_SNT;
 353         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 354         spin_unlock_bh(&sta->plink_lock);
 355         mpl_dbg("Mesh plink: starting establishment with %s\n",
 356                 print_mac(mac, sta->addr));
 357
 358         return mesh_plink_frame_tx(sta->dev, PLINK_OPEN, 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 = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 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                 sta_info_put(sta);
 391                 return 0;
 392         } else if (sta->plink_state == ESTAB) {
 393                 mesh_plink_deactivate(sta);
 394                 /* The timer should not be running */
 395                 if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
 396                         __sta_info_get(sta);
 397         } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
 398                 sta->ignore_plink_timer = true;
 399
 400         sta->plink_state = HOLDING;
 401         llid = sta->llid;
 402         plid = sta->plid;
 403         spin_unlock_bh(&sta->plink_lock);
 404         mesh_plink_frame_tx(sta->dev, PLINK_CLOSE, sta->addr, llid, plid,
 405                             reason);
 406         return 0;
 407 }
 408
 409 void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt,
 410                          size_t len, struct ieee80211_rx_status *rx_status)
 411 {
 412         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 413         struct ieee802_11_elems elems;
 414         struct sta_info *sta;
 415         enum plink_event event;
 416         enum plink_frame_type ftype;
 417         size_t baselen;
 418         u8 ie_len;
 419         u8 *baseaddr;
 420         __le16 plid, llid, reason;
 421 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 422         DECLARE_MAC_BUF(mac);
 423 #endif
 424         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 425
 426         if (is_multicast_ether_addr(mgmt->da)) {
 427                 mpl_dbg("Mesh plink: ignore frame from multicast address");
 428                 return;
 429         }
 430
 431         baseaddr = mgmt->u.action.u.plink_action.variable;
 432         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
 433         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
 434                 baseaddr += 4;
 435                 baselen -= 4;
 436         }
 437         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
 438         if (!elems.peer_link) {
 439                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
 440                 return;
 441         }
 442
 443         ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link));
 444         ie_len = elems.peer_link_len;
 445         if ((ftype == PLINK_OPEN && ie_len != 3) ||
 446             (ftype == PLINK_CONFIRM && ie_len != 5) ||
 447             (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) {
 448                 mpl_dbg("Mesh plink: incorrect plink ie length\n");
 449                 return;
 450         }
 451
 452         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
 453                 mpl_dbg("Mesh plink: missing necessary ie\n");
 454                 return;
 455         }
 456         /* Note the lines below are correct, the llid in the frame is the plid
 457          * from the point of view of this host.
 458          */
 459         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
 460         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7))
 461                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
 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                 return;
 467         }
 468
 469         if (sta && sta->plink_state == BLOCKED) {
 470                 sta_info_put(sta);
 471                 return;
 472         }
 473
 474         /* Now we will figure out the appropriate event... */
 475         event = PLINK_UNDEFINED;
 476         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, dev))) {
 477                 switch (ftype) {
 478                 case PLINK_OPEN:
 479                         event = OPN_RJCT;
 480                         break;
 481                 case PLINK_CONFIRM:
 482                         event = CNF_RJCT;
 483                         break;
 484                 case PLINK_CLOSE:
 485                         /* avoid warning */
 486                         break;
 487                 }
 488                 spin_lock_bh(&sta->plink_lock);
 489         } else if (!sta) {
 490                 /* ftype == PLINK_OPEN */
 491                 u64 rates;
 492                 if (!mesh_plink_free_count(sdata)) {
 493                         mpl_dbg("Mesh plink error: no more free plinks\n");
 494                         return;
 495                 }
 496
 497                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
 498                 sta = mesh_plink_add(mgmt->sa, rates, dev);
 499                 if (IS_ERR(sta)) {
 500                         mpl_dbg("Mesh plink error: plink table full\n");
 501                         return;
 502                 }
 503                 event = OPN_ACPT;
 504                 spin_lock_bh(&sta->plink_lock);
 505         } else {
 506                 spin_lock_bh(&sta->plink_lock);
 507                 switch (ftype) {
 508                 case PLINK_OPEN:
 509                         if (!mesh_plink_free_count(sdata) ||
 510                                         (sta->plid && sta->plid != plid))
 511                                 event = OPN_IGNR;
 512                         else
 513                                 event = OPN_ACPT;
 514                         break;
 515                 case PLINK_CONFIRM:
 516                         if (!mesh_plink_free_count(sdata) ||
 517                                 (sta->llid != llid || sta->plid != plid))
 518                                 event = CNF_IGNR;
 519                         else
 520                                 event = CNF_ACPT;
 521                         break;
 522                 case PLINK_CLOSE:
 523                         if (sta->plink_state == ESTAB)
 524                                 /* Do not check for llid or plid. This does not
 525                                  * follow the standard but since multiple plinks
 526                                  * per sta are not supported, it is necessary in
 527                                  * order to avoid a livelock when MP A sees an
 528                                  * establish peer link to MP B but MP B does not
 529                                  * see it. This can be caused by a timeout in
 530                                  * B's peer link establishment or B beign
 531                                  * restarted.
 532                                  */
 533                                 event = CLS_ACPT;
 534                         else if (sta->plid != plid)
 535                                 event = CLS_IGNR;
 536                         else if (ie_len == 7 && sta->llid != llid)
 537                                 event = CLS_IGNR;
 538                         else
 539                                 event = CLS_ACPT;
 540                         break;
 541                 default:
 542                         mpl_dbg("Mesh plink: unknown frame subtype\n");
 543                         spin_unlock_bh(&sta->plink_lock);
 544                         sta_info_put(sta);
 545                         return;
 546                 }
 547         }
 548
 549         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n",
 550                         print_mac(mac, mgmt->sa), sta->plink_state,
 551                         __le16_to_cpu(sta->llid), __le16_to_cpu(sta->plid),
 552                         event);
 553         reason = 0;
 554         switch (sta->plink_state) {
 555                 /* spin_unlock as soon as state is updated at each case */
 556         case LISTEN:
 557                 switch (event) {
 558                 case CLS_ACPT:
 559                         mesh_plink_fsm_restart(sta);
 560                         spin_unlock_bh(&sta->plink_lock);
 561                         break;
 562                 case OPN_ACPT:
 563                         sta->plink_state = OPN_RCVD;
 564                         sta->plid = plid;
 565                         get_random_bytes(&llid, 2);
 566                         sta->llid = llid;
 567                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 568                         spin_unlock_bh(&sta->plink_lock);
 569                         mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid,
 570                                             0, 0);
 571                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr,
 572                                             llid, plid, 0);
 573                         break;
 574                 default:
 575                         spin_unlock_bh(&sta->plink_lock);
 576                         break;
 577                 }
 578                 break;
 579
 580         case OPN_SNT:
 581                 switch (event) {
 582                 case OPN_RJCT:
 583                 case CNF_RJCT:
 584                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 585                 case CLS_ACPT:
 586                         if (!reason)
 587                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 588                         sta->reason = reason;
 589                         sta->plink_state = HOLDING;
 590                         if (!mod_plink_timer(sta,
 591                                              dot11MeshHoldingTimeout(sdata)))
 592                                 sta->ignore_plink_timer = true;
 593
 594                         llid = sta->llid;
 595                         spin_unlock_bh(&sta->plink_lock);
 596                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 597                                             plid, reason);
 598                         break;
 599                 case OPN_ACPT:
 600                         /* retry timer is left untouched */
 601                         sta->plink_state = OPN_RCVD;
 602                         sta->plid = plid;
 603                         llid = sta->llid;
 604                         spin_unlock_bh(&sta->plink_lock);
 605                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 606                                             plid, 0);
 607                         break;
 608                 case CNF_ACPT:
 609                         sta->plink_state = CNF_RCVD;
 610                         if (!mod_plink_timer(sta,
 611                                              dot11MeshConfirmTimeout(sdata)))
 612                                 sta->ignore_plink_timer = true;
 613
 614                         spin_unlock_bh(&sta->plink_lock);
 615                         break;
 616                 default:
 617                         spin_unlock_bh(&sta->plink_lock);
 618                         break;
 619                 }
 620                 break;
 621
 622         case OPN_RCVD:
 623                 switch (event) {
 624                 case OPN_RJCT:
 625                 case CNF_RJCT:
 626                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 627                 case CLS_ACPT:
 628                         if (!reason)
 629                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 630                         sta->reason = reason;
 631                         sta->plink_state = HOLDING;
 632                         if (!mod_plink_timer(sta,
 633                                              dot11MeshHoldingTimeout(sdata)))
 634                                 sta->ignore_plink_timer = true;
 635
 636                         llid = sta->llid;
 637                         spin_unlock_bh(&sta->plink_lock);
 638                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 639                                             plid, reason);
 640                         break;
 641                 case OPN_ACPT:
 642                         llid = sta->llid;
 643                         spin_unlock_bh(&sta->plink_lock);
 644                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 645                                             plid, 0);
 646                         break;
 647                 case CNF_ACPT:
 648                         if (del_timer(&sta->plink_timer))
 649                                 sta_info_put(sta);
 650                         sta->plink_state = ESTAB;
 651                         mesh_plink_inc_estab_count(sdata);
 652                         spin_unlock_bh(&sta->plink_lock);
 653                         mpl_dbg("Mesh plink with %s ESTABLISHED\n",
 654                                         print_mac(mac, sta->addr));
 655                         break;
 656                 default:
 657                         spin_unlock_bh(&sta->plink_lock);
 658                         break;
 659                 }
 660                 break;
 661
 662         case CNF_RCVD:
 663                 switch (event) {
 664                 case OPN_RJCT:
 665                 case CNF_RJCT:
 666                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 667                 case CLS_ACPT:
 668                         if (!reason)
 669                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 670                         sta->reason = reason;
 671                         sta->plink_state = HOLDING;
 672                         if (!mod_plink_timer(sta,
 673                                              dot11MeshHoldingTimeout(sdata)))
 674                                 sta->ignore_plink_timer = true;
 675
 676                         llid = sta->llid;
 677                         spin_unlock_bh(&sta->plink_lock);
 678                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 679                                             plid, reason);
 680                 case OPN_ACPT:
 681                         if (del_timer(&sta->plink_timer))
 682                                 sta_info_put(sta);
 683                         sta->plink_state = ESTAB;
 684                         mesh_plink_inc_estab_count(sdata);
 685                         spin_unlock_bh(&sta->plink_lock);
 686                         mpl_dbg("Mesh plink with %s ESTABLISHED\n",
 687                                         print_mac(mac, sta->addr));
 688                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 689                                             plid, 0);
 690                         break;
 691                 default:
 692                         spin_unlock_bh(&sta->plink_lock);
 693                         break;
 694                 }
 695                 break;
 696
 697         case ESTAB:
 698                 switch (event) {
 699                 case CLS_ACPT:
 700                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
 701                         sta->reason = reason;
 702                         mesh_plink_deactivate(sta);
 703                         sta->plink_state = HOLDING;
 704                         llid = sta->llid;
 705                         if (!mod_plink_timer(sta,
 706                                         dot11MeshHoldingTimeout(sdata)))
 707                                 __sta_info_get(sta);
 708                         spin_unlock_bh(&sta->plink_lock);
 709                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 710                                             plid, reason);
 711                         break;
 712                 case OPN_ACPT:
 713                         llid = sta->llid;
 714                         spin_unlock_bh(&sta->plink_lock);
 715                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 716                                             plid, 0);
 717                         break;
 718                 default:
 719                         spin_unlock_bh(&sta->plink_lock);
 720                         break;
 721                 }
 722                 break;
 723         case HOLDING:
 724                 switch (event) {
 725                 case CLS_ACPT:
 726                         if (del_timer(&sta->plink_timer)) {
 727                                 sta->ignore_plink_timer = 1;
 728                                 sta_info_put(sta);
 729                         }
 730                         mesh_plink_fsm_restart(sta);
 731                         spin_unlock_bh(&sta->plink_lock);
 732                         break;
 733                 case OPN_ACPT:
 734                 case CNF_ACPT:
 735                 case OPN_RJCT:
 736                 case CNF_RJCT:
 737                         llid = sta->llid;
 738                         reason = sta->reason;
 739                         spin_unlock_bh(&sta->plink_lock);
 740                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 741                                             plid, reason);
 742                         break;
 743                 default:
 744                         spin_unlock_bh(&sta->plink_lock);
 745                 }
 746                 break;
 747         default:
 748                 /* should not get here, BLOCKED is dealt with at the beggining
 749                  * of the function
 750                  */
 751                 spin_unlock_bh(&sta->plink_lock);
 752                 break;
 753         }
 754         sta_info_put(sta);
 755 }