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   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->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 static 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 /**
 152  * __mesh_plink_deactivate - deactivate mesh peer link
 153  *
 154  * @sta: mesh peer link to deactivate
 155  *
 156  * All mesh paths with this peer as next hop will be flushed
 157  */
 158 void mesh_plink_deactivate(struct sta_info *sta)
 159 {
 160         spin_lock_bh(&sta->plink_lock);
 161         __mesh_plink_deactivate(sta);
 162         spin_unlock_bh(&sta->plink_lock);
 163 }
 164
 165 static int mesh_plink_frame_tx(struct net_device *dev,
 166                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
 167                 __le16 reason) {
 168         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 169         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 170         struct ieee80211_mgmt *mgmt;
 171         bool include_plid = false;
 172         u8 *pos;
 173         int ie_len;
 174
 175         if (!skb)
 176                 return -1;
 177         skb_reserve(skb, local->hw.extra_tx_headroom);
 178         /* 25 is the size of the common mgmt part (24) plus the size of the
 179          * common action part (1)
 180          */
 181         mgmt = (struct ieee80211_mgmt *)
 182                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
 183         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
 184         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 185                                            IEEE80211_STYPE_ACTION);
 186         memcpy(mgmt->da, da, ETH_ALEN);
 187         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 188         /* BSSID is left zeroed, wildcard value */
 189         mgmt->u.action.category = PLINK_CATEGORY;
 190         mgmt->u.action.u.plink_action.action_code = action;
 191
 192         if (action == PLINK_CLOSE)
 193                 mgmt->u.action.u.plink_action.aux = reason;
 194         else {
 195                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
 196                 if (action == PLINK_CONFIRM) {
 197                         pos = skb_put(skb, 4);
 198                         /* two-byte status code followed by two-byte AID */
 199                         memset(pos, 0, 4);
 200                 }
 201                 mesh_mgmt_ies_add(skb, dev);
 202         }
 203
 204         /* Add Peer Link Management element */
 205         switch (action) {
 206         case PLINK_OPEN:
 207                 ie_len = 3;
 208                 break;
 209         case PLINK_CONFIRM:
 210                 ie_len = 5;
 211                 include_plid = true;
 212                 break;
 213         case PLINK_CLOSE:
 214         default:
 215                 if (!plid)
 216                         ie_len = 5;
 217                 else {
 218                         ie_len = 7;
 219                         include_plid = true;
 220                 }
 221                 break;
 222         }
 223
 224         pos = skb_put(skb, 2 + ie_len);
 225         *pos++ = WLAN_EID_PEER_LINK;
 226         *pos++ = ie_len;
 227         *pos++ = action;
 228         memcpy(pos, &llid, 2);
 229         if (include_plid) {
 230                 pos += 2;
 231                 memcpy(pos, &plid, 2);
 232         }
 233         if (action == PLINK_CLOSE) {
 234                 pos += 2;
 235                 memcpy(pos, &reason, 2);
 236         }
 237
 238         ieee80211_sta_tx(dev, skb, 0);
 239         return 0;
 240 }
 241
 242 void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev,
 243                            bool peer_accepting_plinks)
 244 {
 245         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 246         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 247         struct sta_info *sta;
 248
 249         sta = sta_info_get(local, hw_addr);
 250         if (!sta) {
 251                 sta = mesh_plink_add(hw_addr, rates, dev);
 252                 if (IS_ERR(sta))
 253                         return;
 254         }
 255
 256         sta->last_rx = jiffies;
 257         sta->supp_rates[local->hw.conf.channel->band] = rates;
 258         if (peer_accepting_plinks && sta->plink_state == LISTEN &&
 259                         sdata->u.sta.accepting_plinks &&
 260                         sdata->u.sta.mshcfg.auto_open_plinks)
 261                 mesh_plink_open(sta);
 262
 263         sta_info_put(sta);
 264 }
 265
 266 static void mesh_plink_timer(unsigned long data)
 267 {
 268         struct sta_info *sta;
 269         __le16 llid, plid, reason;
 270         struct net_device *dev = NULL;
 271         struct ieee80211_sub_if_data *sdata;
 272 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 273         DECLARE_MAC_BUF(mac);
 274 #endif
 275
 276         sta = (struct sta_info *) data;
 277
 278         spin_lock_bh(&sta->plink_lock);
 279         if (sta->ignore_plink_timer) {
 280                 sta->ignore_plink_timer = false;
 281                 spin_unlock_bh(&sta->plink_lock);
 282                 return;
 283         }
 284         mpl_dbg("Mesh plink timer for %s fired on state %d\n",
 285                         print_mac(mac, sta->addr), sta->plink_state);
 286         reason = 0;
 287         llid = sta->llid;
 288         plid = sta->plid;
 289         dev = sta->dev;
 290         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 291
 292         switch (sta->plink_state) {
 293         case OPN_RCVD:
 294         case OPN_SNT:
 295                 /* retry timer */
 296                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
 297                         u32 rand;
 298                         mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n",
 299                                         print_mac(mac, sta->addr),
 300                                         sta->plink_retries, sta->plink_timeout);
 301                         get_random_bytes(&rand, sizeof(u32));
 302                         sta->plink_timeout = sta->plink_timeout +
 303                                              rand % sta->plink_timeout;
 304                         ++sta->plink_retries;
 305                         if (!mod_plink_timer(sta, sta->plink_timeout))
 306                                 __sta_info_get(sta);
 307                         spin_unlock_bh(&sta->plink_lock);
 308                         mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid,
 309                                             0, 0);
 310                         break;
 311                 }
 312                 reason = cpu_to_le16(MESH_MAX_RETRIES);
 313                 /* fall through on else */
 314         case CNF_RCVD:
 315                 /* confirm timer */
 316                 if (!reason)
 317                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
 318                 sta->plink_state = HOLDING;
 319                 if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
 320                         __sta_info_get(sta);
 321                 spin_unlock_bh(&sta->plink_lock);
 322                 mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid,
 323                                     reason);
 324                 break;
 325         case HOLDING:
 326                 /* holding timer */
 327                 if (del_timer(&sta->plink_timer))
 328                         sta_info_put(sta);
 329                 mesh_plink_fsm_restart(sta);
 330                 spin_unlock_bh(&sta->plink_lock);
 331                 break;
 332         default:
 333                 spin_unlock_bh(&sta->plink_lock);
 334                 break;
 335         }
 336
 337         sta_info_put(sta);
 338 }
 339
 340 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
 341 {
 342         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
 343         sta->plink_timer.data = (unsigned long) sta;
 344         sta->plink_timer.function = mesh_plink_timer;
 345         sta->plink_timeout = timeout;
 346         __sta_info_get(sta);
 347         add_timer(&sta->plink_timer);
 348 }
 349
 350 int mesh_plink_open(struct sta_info *sta)
 351 {
 352         __le16 llid;
 353         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 354 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 355         DECLARE_MAC_BUF(mac);
 356 #endif
 357
 358         spin_lock_bh(&sta->plink_lock);
 359         get_random_bytes(&llid, 2);
 360         sta->llid = llid;
 361         if (sta->plink_state != LISTEN) {
 362                 spin_unlock_bh(&sta->plink_lock);
 363                 sta_info_put(sta);
 364                 return -EBUSY;
 365         }
 366         sta->plink_state = OPN_SNT;
 367         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 368         spin_unlock_bh(&sta->plink_lock);
 369         mpl_dbg("Mesh plink: starting establishment with %s\n",
 370                 print_mac(mac, sta->addr));
 371
 372         return mesh_plink_frame_tx(sta->dev, PLINK_OPEN, sta->addr, llid, 0, 0);
 373 }
 374
 375 void mesh_plink_block(struct sta_info *sta)
 376 {
 377 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 378         DECLARE_MAC_BUF(mac);
 379 #endif
 380
 381         spin_lock_bh(&sta->plink_lock);
 382         __mesh_plink_deactivate(sta);
 383         sta->plink_state = BLOCKED;
 384         spin_unlock_bh(&sta->plink_lock);
 385 }
 386
 387 int mesh_plink_close(struct sta_info *sta)
 388 {
 389         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 390         int llid, plid, reason;
 391 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 392         DECLARE_MAC_BUF(mac);
 393 #endif
 394
 395         mpl_dbg("Mesh plink: closing link with %s\n",
 396                         print_mac(mac, sta->addr));
 397         spin_lock_bh(&sta->plink_lock);
 398         sta->reason = cpu_to_le16(MESH_LINK_CANCELLED);
 399         reason = sta->reason;
 400
 401         if (sta->plink_state == LISTEN || sta->plink_state == BLOCKED) {
 402                 mesh_plink_fsm_restart(sta);
 403                 spin_unlock_bh(&sta->plink_lock);
 404                 sta_info_put(sta);
 405                 return 0;
 406         } else if (sta->plink_state == ESTAB) {
 407                 __mesh_plink_deactivate(sta);
 408                 /* The timer should not be running */
 409                 if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
 410                         __sta_info_get(sta);
 411         } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
 412                 sta->ignore_plink_timer = true;
 413
 414         sta->plink_state = HOLDING;
 415         llid = sta->llid;
 416         plid = sta->plid;
 417         spin_unlock_bh(&sta->plink_lock);
 418         mesh_plink_frame_tx(sta->dev, PLINK_CLOSE, sta->addr, llid, plid,
 419                             reason);
 420         return 0;
 421 }
 422
 423 void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt,
 424                          size_t len, struct ieee80211_rx_status *rx_status)
 425 {
 426         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 427         struct ieee802_11_elems elems;
 428         struct sta_info *sta;
 429         enum plink_event event;
 430         enum plink_frame_type ftype;
 431         size_t baselen;
 432         u8 ie_len;
 433         u8 *baseaddr;
 434         __le16 plid, llid, reason;
 435 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 436         DECLARE_MAC_BUF(mac);
 437 #endif
 438         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 439
 440         if (is_multicast_ether_addr(mgmt->da)) {
 441                 mpl_dbg("Mesh plink: ignore frame from multicast address");
 442                 return;
 443         }
 444
 445         baseaddr = mgmt->u.action.u.plink_action.variable;
 446         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
 447         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
 448                 baseaddr += 4;
 449                 baselen -= 4;
 450         }
 451         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
 452         if (!elems.peer_link) {
 453                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
 454                 return;
 455         }
 456
 457         ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link));
 458         ie_len = elems.peer_link_len;
 459         if ((ftype == PLINK_OPEN && ie_len != 3) ||
 460             (ftype == PLINK_CONFIRM && ie_len != 5) ||
 461             (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) {
 462                 mpl_dbg("Mesh plink: incorrect plink ie length\n");
 463                 return;
 464         }
 465
 466         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
 467                 mpl_dbg("Mesh plink: missing necessary ie\n");
 468                 return;
 469         }
 470         /* Note the lines below are correct, the llid in the frame is the plid
 471          * from the point of view of this host.
 472          */
 473         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
 474         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7))
 475                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
 476
 477         sta = sta_info_get(local, mgmt->sa);
 478         if (!sta && ftype != PLINK_OPEN) {
 479                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
 480                 return;
 481         }
 482
 483         if (sta && sta->plink_state == BLOCKED) {
 484                 sta_info_put(sta);
 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, dev))) {
 491                 switch (ftype) {
 492                 case PLINK_OPEN:
 493                         event = OPN_RJCT;
 494                         break;
 495                 case PLINK_CONFIRM:
 496                         event = CNF_RJCT;
 497                         break;
 498                 case PLINK_CLOSE:
 499                         /* avoid warning */
 500                         break;
 501                 }
 502                 spin_lock_bh(&sta->plink_lock);
 503         } else if (!sta) {
 504                 /* ftype == PLINK_OPEN */
 505                 u64 rates;
 506                 if (!mesh_plink_free_count(sdata)) {
 507                         mpl_dbg("Mesh plink error: no more free plinks\n");
 508                         return;
 509                 }
 510
 511                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
 512                 sta = mesh_plink_add(mgmt->sa, rates, dev);
 513                 if (IS_ERR(sta)) {
 514                         mpl_dbg("Mesh plink error: plink table full\n");
 515                         return;
 516                 }
 517                 event = OPN_ACPT;
 518                 spin_lock_bh(&sta->plink_lock);
 519         } else {
 520                 spin_lock_bh(&sta->plink_lock);
 521                 switch (ftype) {
 522                 case PLINK_OPEN:
 523                         if (!mesh_plink_free_count(sdata) ||
 524                                         (sta->plid && sta->plid != plid))
 525                                 event = OPN_IGNR;
 526                         else
 527                                 event = OPN_ACPT;
 528                         break;
 529                 case PLINK_CONFIRM:
 530                         if (!mesh_plink_free_count(sdata) ||
 531                                 (sta->llid != llid || sta->plid != plid))
 532                                 event = CNF_IGNR;
 533                         else
 534                                 event = CNF_ACPT;
 535                         break;
 536                 case PLINK_CLOSE:
 537                         if (sta->plink_state == ESTAB)
 538                                 /* Do not check for llid or plid. This does not
 539                                  * follow the standard but since multiple plinks
 540                                  * per sta are not supported, it is necessary in
 541                                  * order to avoid a livelock when MP A sees an
 542                                  * establish peer link to MP B but MP B does not
 543                                  * see it. This can be caused by a timeout in
 544                                  * B's peer link establishment or B beign
 545                                  * restarted.
 546                                  */
 547                                 event = CLS_ACPT;
 548                         else if (sta->plid != plid)
 549                                 event = CLS_IGNR;
 550                         else if (ie_len == 7 && sta->llid != llid)
 551                                 event = CLS_IGNR;
 552                         else
 553                                 event = CLS_ACPT;
 554                         break;
 555                 default:
 556                         mpl_dbg("Mesh plink: unknown frame subtype\n");
 557                         spin_unlock_bh(&sta->plink_lock);
 558                         sta_info_put(sta);
 559                         return;
 560                 }
 561         }
 562
 563         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n",
 564                         print_mac(mac, mgmt->sa), sta->plink_state,
 565                         __le16_to_cpu(sta->llid), __le16_to_cpu(sta->plid),
 566                         event);
 567         reason = 0;
 568         switch (sta->plink_state) {
 569                 /* spin_unlock as soon as state is updated at each case */
 570         case LISTEN:
 571                 switch (event) {
 572                 case CLS_ACPT:
 573                         mesh_plink_fsm_restart(sta);
 574                         spin_unlock_bh(&sta->plink_lock);
 575                         break;
 576                 case OPN_ACPT:
 577                         sta->plink_state = OPN_RCVD;
 578                         sta->plid = plid;
 579                         get_random_bytes(&llid, 2);
 580                         sta->llid = llid;
 581                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 582                         spin_unlock_bh(&sta->plink_lock);
 583                         mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid,
 584                                             0, 0);
 585                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr,
 586                                             llid, plid, 0);
 587                         break;
 588                 default:
 589                         spin_unlock_bh(&sta->plink_lock);
 590                         break;
 591                 }
 592                 break;
 593
 594         case OPN_SNT:
 595                 switch (event) {
 596                 case OPN_RJCT:
 597                 case CNF_RJCT:
 598                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 599                 case CLS_ACPT:
 600                         if (!reason)
 601                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 602                         sta->reason = reason;
 603                         sta->plink_state = HOLDING;
 604                         if (!mod_plink_timer(sta,
 605                                              dot11MeshHoldingTimeout(sdata)))
 606                                 sta->ignore_plink_timer = true;
 607
 608                         llid = sta->llid;
 609                         spin_unlock_bh(&sta->plink_lock);
 610                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 611                                             plid, reason);
 612                         break;
 613                 case OPN_ACPT:
 614                         /* retry timer is left untouched */
 615                         sta->plink_state = OPN_RCVD;
 616                         sta->plid = plid;
 617                         llid = sta->llid;
 618                         spin_unlock_bh(&sta->plink_lock);
 619                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 620                                             plid, 0);
 621                         break;
 622                 case CNF_ACPT:
 623                         sta->plink_state = CNF_RCVD;
 624                         if (!mod_plink_timer(sta,
 625                                              dot11MeshConfirmTimeout(sdata)))
 626                                 sta->ignore_plink_timer = true;
 627
 628                         spin_unlock_bh(&sta->plink_lock);
 629                         break;
 630                 default:
 631                         spin_unlock_bh(&sta->plink_lock);
 632                         break;
 633                 }
 634                 break;
 635
 636         case OPN_RCVD:
 637                 switch (event) {
 638                 case OPN_RJCT:
 639                 case CNF_RJCT:
 640                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 641                 case CLS_ACPT:
 642                         if (!reason)
 643                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 644                         sta->reason = reason;
 645                         sta->plink_state = HOLDING;
 646                         if (!mod_plink_timer(sta,
 647                                              dot11MeshHoldingTimeout(sdata)))
 648                                 sta->ignore_plink_timer = true;
 649
 650                         llid = sta->llid;
 651                         spin_unlock_bh(&sta->plink_lock);
 652                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 653                                             plid, reason);
 654                         break;
 655                 case OPN_ACPT:
 656                         llid = sta->llid;
 657                         spin_unlock_bh(&sta->plink_lock);
 658                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 659                                             plid, 0);
 660                         break;
 661                 case CNF_ACPT:
 662                         if (del_timer(&sta->plink_timer))
 663                                 sta_info_put(sta);
 664                         sta->plink_state = ESTAB;
 665                         mesh_plink_inc_estab_count(sdata);
 666                         spin_unlock_bh(&sta->plink_lock);
 667                         mpl_dbg("Mesh plink with %s ESTABLISHED\n",
 668                                         print_mac(mac, sta->addr));
 669                         break;
 670                 default:
 671                         spin_unlock_bh(&sta->plink_lock);
 672                         break;
 673                 }
 674                 break;
 675
 676         case CNF_RCVD:
 677                 switch (event) {
 678                 case OPN_RJCT:
 679                 case CNF_RJCT:
 680                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 681                 case CLS_ACPT:
 682                         if (!reason)
 683                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 684                         sta->reason = reason;
 685                         sta->plink_state = HOLDING;
 686                         if (!mod_plink_timer(sta,
 687                                              dot11MeshHoldingTimeout(sdata)))
 688                                 sta->ignore_plink_timer = true;
 689
 690                         llid = sta->llid;
 691                         spin_unlock_bh(&sta->plink_lock);
 692                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 693                                             plid, reason);
 694                         break;
 695                 case OPN_ACPT:
 696                         if (del_timer(&sta->plink_timer))
 697                                 sta_info_put(sta);
 698                         sta->plink_state = ESTAB;
 699                         mesh_plink_inc_estab_count(sdata);
 700                         spin_unlock_bh(&sta->plink_lock);
 701                         mpl_dbg("Mesh plink with %s ESTABLISHED\n",
 702                                         print_mac(mac, sta->addr));
 703                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 704                                             plid, 0);
 705                         break;
 706                 default:
 707                         spin_unlock_bh(&sta->plink_lock);
 708                         break;
 709                 }
 710                 break;
 711
 712         case ESTAB:
 713                 switch (event) {
 714                 case CLS_ACPT:
 715                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
 716                         sta->reason = reason;
 717                         __mesh_plink_deactivate(sta);
 718                         sta->plink_state = HOLDING;
 719                         llid = sta->llid;
 720                         if (!mod_plink_timer(sta,
 721                                         dot11MeshHoldingTimeout(sdata)))
 722                                 __sta_info_get(sta);
 723                         spin_unlock_bh(&sta->plink_lock);
 724                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 725                                             plid, reason);
 726                         break;
 727                 case OPN_ACPT:
 728                         llid = sta->llid;
 729                         spin_unlock_bh(&sta->plink_lock);
 730                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 731                                             plid, 0);
 732                         break;
 733                 default:
 734                         spin_unlock_bh(&sta->plink_lock);
 735                         break;
 736                 }
 737                 break;
 738         case HOLDING:
 739                 switch (event) {
 740                 case CLS_ACPT:
 741                         if (del_timer(&sta->plink_timer)) {
 742                                 sta->ignore_plink_timer = 1;
 743                                 sta_info_put(sta);
 744                         }
 745                         mesh_plink_fsm_restart(sta);
 746                         spin_unlock_bh(&sta->plink_lock);
 747                         break;
 748                 case OPN_ACPT:
 749                 case CNF_ACPT:
 750                 case OPN_RJCT:
 751                 case CNF_RJCT:
 752                         llid = sta->llid;
 753                         reason = sta->reason;
 754                         spin_unlock_bh(&sta->plink_lock);
 755                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 756                                             plid, reason);
 757                         break;
 758                 default:
 759                         spin_unlock_bh(&sta->plink_lock);
 760                 }
 761                 break;
 762         default:
 763                 /* should not get here, BLOCKED is dealt with at the beggining
 764                  * of the function
 765                  */
 766                 spin_unlock_bh(&sta->plink_lock);
 767                 break;
 768         }
 769         sta_info_put(sta);
 770 }