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 = 0;
  89         sta->plink_retries = 0;
  90 }
  91
  92 static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
  93                                          u8 *hw_addr, u64 rates)
  94 {
  95         struct ieee80211_local *local = sdata->local;
  96         struct sta_info *sta;
  97
  98         if (local->num_sta >= MESH_MAX_PLINKS)
  99                 return NULL;
 100
 101         sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC);
 102         if (!sta)
 103                 return NULL;
 104
 105         sta->flags |= WLAN_STA_AUTHORIZED;
 106         sta->supp_rates[local->hw.conf.channel->band] = rates;
 107
 108         return sta;
 109 }
 110
 111 /**
 112  * mesh_plink_deactivate - deactivate mesh peer link
 113  *
 114  * @sta: mesh peer link to deactivate
 115  *
 116  * All mesh paths with this peer as next hop will be flushed
 117  *
 118  * Locking: the caller must hold sta->plink_lock
 119  */
 120 static void __mesh_plink_deactivate(struct sta_info *sta)
 121 {
 122         struct ieee80211_sub_if_data *sdata = sta->sdata;
 123
 124         if (sta->plink_state == ESTAB)
 125                 mesh_plink_dec_estab_count(sdata);
 126         sta->plink_state = BLOCKED;
 127         mesh_path_flush_by_nexthop(sta);
 128 }
 129
 130 /**
 131  * __mesh_plink_deactivate - deactivate mesh peer link
 132  *
 133  * @sta: mesh peer link to deactivate
 134  *
 135  * All mesh paths with this peer as next hop will be flushed
 136  */
 137 void mesh_plink_deactivate(struct sta_info *sta)
 138 {
 139         spin_lock_bh(&sta->plink_lock);
 140         __mesh_plink_deactivate(sta);
 141         spin_unlock_bh(&sta->plink_lock);
 142 }
 143
 144 static int mesh_plink_frame_tx(struct net_device *dev,
 145                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
 146                 __le16 reason) {
 147         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 148         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 149         struct ieee80211_mgmt *mgmt;
 150         bool include_plid = false;
 151         u8 *pos;
 152         int ie_len;
 153
 154         if (!skb)
 155                 return -1;
 156         skb_reserve(skb, local->hw.extra_tx_headroom);
 157         /* 25 is the size of the common mgmt part (24) plus the size of the
 158          * common action part (1)
 159          */
 160         mgmt = (struct ieee80211_mgmt *)
 161                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
 162         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
 163         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 164                                            IEEE80211_STYPE_ACTION);
 165         memcpy(mgmt->da, da, ETH_ALEN);
 166         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 167         /* BSSID is left zeroed, wildcard value */
 168         mgmt->u.action.category = PLINK_CATEGORY;
 169         mgmt->u.action.u.plink_action.action_code = action;
 170
 171         if (action == PLINK_CLOSE)
 172                 mgmt->u.action.u.plink_action.aux = reason;
 173         else {
 174                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
 175                 if (action == PLINK_CONFIRM) {
 176                         pos = skb_put(skb, 4);
 177                         /* two-byte status code followed by two-byte AID */
 178                         memset(pos, 0, 4);
 179                 }
 180                 mesh_mgmt_ies_add(skb, dev);
 181         }
 182
 183         /* Add Peer Link Management element */
 184         switch (action) {
 185         case PLINK_OPEN:
 186                 ie_len = 3;
 187                 break;
 188         case PLINK_CONFIRM:
 189                 ie_len = 5;
 190                 include_plid = true;
 191                 break;
 192         case PLINK_CLOSE:
 193         default:
 194                 if (!plid)
 195                         ie_len = 5;
 196                 else {
 197                         ie_len = 7;
 198                         include_plid = true;
 199                 }
 200                 break;
 201         }
 202
 203         pos = skb_put(skb, 2 + ie_len);
 204         *pos++ = WLAN_EID_PEER_LINK;
 205         *pos++ = ie_len;
 206         *pos++ = action;
 207         memcpy(pos, &llid, 2);
 208         if (include_plid) {
 209                 pos += 2;
 210                 memcpy(pos, &plid, 2);
 211         }
 212         if (action == PLINK_CLOSE) {
 213                 pos += 2;
 214                 memcpy(pos, &reason, 2);
 215         }
 216
 217         ieee80211_sta_tx(dev, skb, 0);
 218         return 0;
 219 }
 220
 221 void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev,
 222                            bool peer_accepting_plinks)
 223 {
 224         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 225         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 226         struct sta_info *sta;
 227
 228         rcu_read_lock();
 229
 230         sta = sta_info_get(local, hw_addr);
 231         if (!sta) {
 232                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
 233                 if (!sta) {
 234                         rcu_read_unlock();
 235                         return;
 236                 }
 237                 if (sta_info_insert(sta)) {
 238                         sta_info_destroy(sta);
 239                         rcu_read_unlock();
 240                         return;
 241                 }
 242         }
 243
 244         sta->last_rx = jiffies;
 245         sta->supp_rates[local->hw.conf.channel->band] = rates;
 246         if (peer_accepting_plinks && sta->plink_state == LISTEN &&
 247                         sdata->u.sta.accepting_plinks &&
 248                         sdata->u.sta.mshcfg.auto_open_plinks)
 249                 mesh_plink_open(sta);
 250
 251         rcu_read_unlock();
 252 }
 253
 254 static void mesh_plink_timer(unsigned long data)
 255 {
 256         struct sta_info *sta;
 257         __le16 llid, plid, reason;
 258         struct net_device *dev = NULL;
 259         struct ieee80211_sub_if_data *sdata;
 260 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 261         DECLARE_MAC_BUF(mac);
 262 #endif
 263
 264         /*
 265          * This STA is valid because sta_info_destroy() will
 266          * del_timer_sync() this timer after having made sure
 267          * it cannot be readded (by deleting the plink.)
 268          */
 269         sta = (struct sta_info *) data;
 270
 271         spin_lock_bh(&sta->plink_lock);
 272         if (sta->ignore_plink_timer) {
 273                 sta->ignore_plink_timer = false;
 274                 spin_unlock_bh(&sta->plink_lock);
 275                 return;
 276         }
 277         mpl_dbg("Mesh plink timer for %s fired on state %d\n",
 278                         print_mac(mac, sta->addr), sta->plink_state);
 279         reason = 0;
 280         llid = sta->llid;
 281         plid = sta->plid;
 282         sdata = sta->sdata;
 283         dev = sdata->dev;
 284
 285         switch (sta->plink_state) {
 286         case OPN_RCVD:
 287         case OPN_SNT:
 288                 /* retry timer */
 289                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
 290                         u32 rand;
 291                         mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n",
 292                                         print_mac(mac, sta->addr),
 293                                         sta->plink_retries, sta->plink_timeout);
 294                         get_random_bytes(&rand, sizeof(u32));
 295                         sta->plink_timeout = sta->plink_timeout +
 296                                              rand % sta->plink_timeout;
 297                         ++sta->plink_retries;
 298                         mod_plink_timer(sta, sta->plink_timeout);
 299                         spin_unlock_bh(&sta->plink_lock);
 300                         mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid,
 301                                             0, 0);
 302                         break;
 303                 }
 304                 reason = cpu_to_le16(MESH_MAX_RETRIES);
 305                 /* fall through on else */
 306         case CNF_RCVD:
 307                 /* confirm timer */
 308                 if (!reason)
 309                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
 310                 sta->plink_state = HOLDING;
 311                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 312                 spin_unlock_bh(&sta->plink_lock);
 313                 mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid,
 314                                     reason);
 315                 break;
 316         case HOLDING:
 317                 /* holding timer */
 318                 del_timer(&sta->plink_timer);
 319                 mesh_plink_fsm_restart(sta);
 320                 spin_unlock_bh(&sta->plink_lock);
 321                 break;
 322         default:
 323                 spin_unlock_bh(&sta->plink_lock);
 324                 break;
 325         }
 326 }
 327
 328 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
 329 {
 330         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
 331         sta->plink_timer.data = (unsigned long) sta;
 332         sta->plink_timer.function = mesh_plink_timer;
 333         sta->plink_timeout = timeout;
 334         add_timer(&sta->plink_timer);
 335 }
 336
 337 int mesh_plink_open(struct sta_info *sta)
 338 {
 339         __le16 llid;
 340         struct ieee80211_sub_if_data *sdata = sta->sdata;
 341 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 342         DECLARE_MAC_BUF(mac);
 343 #endif
 344
 345         spin_lock_bh(&sta->plink_lock);
 346         get_random_bytes(&llid, 2);
 347         sta->llid = llid;
 348         if (sta->plink_state != LISTEN) {
 349                 spin_unlock_bh(&sta->plink_lock);
 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(sdata->dev, PLINK_OPEN,
 359                                    sta->addr, llid, 0, 0);
 360 }
 361
 362 void mesh_plink_block(struct sta_info *sta)
 363 {
 364 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 365         DECLARE_MAC_BUF(mac);
 366 #endif
 367
 368         spin_lock_bh(&sta->plink_lock);
 369         __mesh_plink_deactivate(sta);
 370         sta->plink_state = BLOCKED;
 371         spin_unlock_bh(&sta->plink_lock);
 372 }
 373
 374 int mesh_plink_close(struct sta_info *sta)
 375 {
 376         struct ieee80211_sub_if_data *sdata = sta->sdata;
 377         __le16 llid, plid, reason;
 378 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 379         DECLARE_MAC_BUF(mac);
 380 #endif
 381
 382         mpl_dbg("Mesh plink: closing link with %s\n",
 383                         print_mac(mac, sta->addr));
 384         spin_lock_bh(&sta->plink_lock);
 385         sta->reason = cpu_to_le16(MESH_LINK_CANCELLED);
 386         reason = sta->reason;
 387
 388         if (sta->plink_state == LISTEN || sta->plink_state == BLOCKED) {
 389                 mesh_plink_fsm_restart(sta);
 390                 spin_unlock_bh(&sta->plink_lock);
 391                 return 0;
 392         } else if (sta->plink_state == ESTAB) {
 393                 __mesh_plink_deactivate(sta);
 394                 /* The timer should not be running */
 395                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 396         } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
 397                 sta->ignore_plink_timer = true;
 398
 399         sta->plink_state = HOLDING;
 400         llid = sta->llid;
 401         plid = sta->plid;
 402         spin_unlock_bh(&sta->plink_lock);
 403         mesh_plink_frame_tx(sta->sdata->dev, PLINK_CLOSE, sta->addr, llid,
 404                             plid, reason);
 405         return 0;
 406 }
 407
 408 void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt,
 409                          size_t len, struct ieee80211_rx_status *rx_status)
 410 {
 411         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 412         struct ieee80211_local *local = sdata->local;
 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
 425         if (is_multicast_ether_addr(mgmt->da)) {
 426                 mpl_dbg("Mesh plink: ignore frame from multicast address");
 427                 return;
 428         }
 429
 430         baseaddr = mgmt->u.action.u.plink_action.variable;
 431         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
 432         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
 433                 baseaddr += 4;
 434                 baselen -= 4;
 435         }
 436         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
 437         if (!elems.peer_link) {
 438                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
 439                 return;
 440         }
 441
 442         ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link));
 443         ie_len = elems.peer_link_len;
 444         if ((ftype == PLINK_OPEN && ie_len != 3) ||
 445             (ftype == PLINK_CONFIRM && ie_len != 5) ||
 446             (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) {
 447                 mpl_dbg("Mesh plink: incorrect plink ie length\n");
 448                 return;
 449         }
 450
 451         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
 452                 mpl_dbg("Mesh plink: missing necessary ie\n");
 453                 return;
 454         }
 455         /* Note the lines below are correct, the llid in the frame is the plid
 456          * from the point of view of this host.
 457          */
 458         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
 459         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7))
 460                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
 461
 462         rcu_read_lock();
 463
 464         sta = sta_info_get(local, mgmt->sa);
 465         if (!sta && ftype != PLINK_OPEN) {
 466                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
 467                 rcu_read_unlock();
 468                 return;
 469         }
 470
 471         if (sta && sta->plink_state == BLOCKED) {
 472                 rcu_read_unlock();
 473                 return;
 474         }
 475
 476         /* Now we will figure out the appropriate event... */
 477         event = PLINK_UNDEFINED;
 478         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, dev))) {
 479                 switch (ftype) {
 480                 case PLINK_OPEN:
 481                         event = OPN_RJCT;
 482                         break;
 483                 case PLINK_CONFIRM:
 484                         event = CNF_RJCT;
 485                         break;
 486                 case PLINK_CLOSE:
 487                         /* avoid warning */
 488                         break;
 489                 }
 490                 spin_lock_bh(&sta->plink_lock);
 491         } else if (!sta) {
 492                 /* ftype == PLINK_OPEN */
 493                 u64 rates;
 494                 if (!mesh_plink_free_count(sdata)) {
 495                         mpl_dbg("Mesh plink error: no more free plinks\n");
 496                         rcu_read_unlock();
 497                         return;
 498                 }
 499
 500                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
 501                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
 502                 if (!sta) {
 503                         mpl_dbg("Mesh plink error: plink table full\n");
 504                         rcu_read_unlock();
 505                         return;
 506                 }
 507                 if (sta_info_insert(sta)) {
 508                         sta_info_destroy(sta);
 509                         rcu_read_unlock();
 510                         return;
 511                 }
 512                 event = OPN_ACPT;
 513                 spin_lock_bh(&sta->plink_lock);
 514         } else {
 515                 spin_lock_bh(&sta->plink_lock);
 516                 switch (ftype) {
 517                 case PLINK_OPEN:
 518                         if (!mesh_plink_free_count(sdata) ||
 519                             (sta->plid && sta->plid != plid))
 520                                 event = OPN_IGNR;
 521                         else
 522                                 event = OPN_ACPT;
 523                         break;
 524                 case PLINK_CONFIRM:
 525                         if (!mesh_plink_free_count(sdata) ||
 526                             (sta->llid != llid || sta->plid != plid))
 527                                 event = CNF_IGNR;
 528                         else
 529                                 event = CNF_ACPT;
 530                         break;
 531                 case PLINK_CLOSE:
 532                         if (sta->plink_state == ESTAB)
 533                                 /* Do not check for llid or plid. This does not
 534                                  * follow the standard but since multiple plinks
 535                                  * per sta are not supported, it is necessary in
 536                                  * order to avoid a livelock when MP A sees an
 537                                  * establish peer link to MP B but MP B does not
 538                                  * see it. This can be caused by a timeout in
 539                                  * B's peer link establishment or B beign
 540                                  * restarted.
 541                                  */
 542                                 event = CLS_ACPT;
 543                         else if (sta->plid != plid)
 544                                 event = CLS_IGNR;
 545                         else if (ie_len == 7 && sta->llid != llid)
 546                                 event = CLS_IGNR;
 547                         else
 548                                 event = CLS_ACPT;
 549                         break;
 550                 default:
 551                         mpl_dbg("Mesh plink: unknown frame subtype\n");
 552                         spin_unlock_bh(&sta->plink_lock);
 553                         rcu_read_unlock();
 554                         return;
 555                 }
 556         }
 557
 558         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n",
 559                         print_mac(mac, mgmt->sa), sta->plink_state,
 560                         __le16_to_cpu(sta->llid), __le16_to_cpu(sta->plid),
 561                         event);
 562         reason = 0;
 563         switch (sta->plink_state) {
 564                 /* spin_unlock as soon as state is updated at each case */
 565         case LISTEN:
 566                 switch (event) {
 567                 case CLS_ACPT:
 568                         mesh_plink_fsm_restart(sta);
 569                         spin_unlock_bh(&sta->plink_lock);
 570                         break;
 571                 case OPN_ACPT:
 572                         sta->plink_state = OPN_RCVD;
 573                         sta->plid = plid;
 574                         get_random_bytes(&llid, 2);
 575                         sta->llid = llid;
 576                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 577                         spin_unlock_bh(&sta->plink_lock);
 578                         mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid,
 579                                             0, 0);
 580                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr,
 581                                             llid, plid, 0);
 582                         break;
 583                 default:
 584                         spin_unlock_bh(&sta->plink_lock);
 585                         break;
 586                 }
 587                 break;
 588
 589         case OPN_SNT:
 590                 switch (event) {
 591                 case OPN_RJCT:
 592                 case CNF_RJCT:
 593                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 594                 case CLS_ACPT:
 595                         if (!reason)
 596                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 597                         sta->reason = reason;
 598                         sta->plink_state = HOLDING;
 599                         if (!mod_plink_timer(sta,
 600                                              dot11MeshHoldingTimeout(sdata)))
 601                                 sta->ignore_plink_timer = true;
 602
 603                         llid = sta->llid;
 604                         spin_unlock_bh(&sta->plink_lock);
 605                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 606                                             plid, reason);
 607                         break;
 608                 case OPN_ACPT:
 609                         /* retry timer is left untouched */
 610                         sta->plink_state = OPN_RCVD;
 611                         sta->plid = plid;
 612                         llid = sta->llid;
 613                         spin_unlock_bh(&sta->plink_lock);
 614                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 615                                             plid, 0);
 616                         break;
 617                 case CNF_ACPT:
 618                         sta->plink_state = CNF_RCVD;
 619                         if (!mod_plink_timer(sta,
 620                                              dot11MeshConfirmTimeout(sdata)))
 621                                 sta->ignore_plink_timer = true;
 622
 623                         spin_unlock_bh(&sta->plink_lock);
 624                         break;
 625                 default:
 626                         spin_unlock_bh(&sta->plink_lock);
 627                         break;
 628                 }
 629                 break;
 630
 631         case OPN_RCVD:
 632                 switch (event) {
 633                 case OPN_RJCT:
 634                 case CNF_RJCT:
 635                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 636                 case CLS_ACPT:
 637                         if (!reason)
 638                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 639                         sta->reason = reason;
 640                         sta->plink_state = HOLDING;
 641                         if (!mod_plink_timer(sta,
 642                                              dot11MeshHoldingTimeout(sdata)))
 643                                 sta->ignore_plink_timer = true;
 644
 645                         llid = sta->llid;
 646                         spin_unlock_bh(&sta->plink_lock);
 647                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 648                                             plid, reason);
 649                         break;
 650                 case OPN_ACPT:
 651                         llid = sta->llid;
 652                         spin_unlock_bh(&sta->plink_lock);
 653                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 654                                             plid, 0);
 655                         break;
 656                 case CNF_ACPT:
 657                         del_timer(&sta->plink_timer);
 658                         sta->plink_state = ESTAB;
 659                         mesh_plink_inc_estab_count(sdata);
 660                         spin_unlock_bh(&sta->plink_lock);
 661                         mpl_dbg("Mesh plink with %s ESTABLISHED\n",
 662                                         print_mac(mac, sta->addr));
 663                         break;
 664                 default:
 665                         spin_unlock_bh(&sta->plink_lock);
 666                         break;
 667                 }
 668                 break;
 669
 670         case CNF_RCVD:
 671                 switch (event) {
 672                 case OPN_RJCT:
 673                 case CNF_RJCT:
 674                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 675                 case CLS_ACPT:
 676                         if (!reason)
 677                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 678                         sta->reason = reason;
 679                         sta->plink_state = HOLDING;
 680                         if (!mod_plink_timer(sta,
 681                                              dot11MeshHoldingTimeout(sdata)))
 682                                 sta->ignore_plink_timer = true;
 683
 684                         llid = sta->llid;
 685                         spin_unlock_bh(&sta->plink_lock);
 686                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 687                                             plid, reason);
 688                         break;
 689                 case OPN_ACPT:
 690                         del_timer(&sta->plink_timer);
 691                         sta->plink_state = ESTAB;
 692                         mesh_plink_inc_estab_count(sdata);
 693                         spin_unlock_bh(&sta->plink_lock);
 694                         mpl_dbg("Mesh plink with %s ESTABLISHED\n",
 695                                         print_mac(mac, sta->addr));
 696                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 697                                             plid, 0);
 698                         break;
 699                 default:
 700                         spin_unlock_bh(&sta->plink_lock);
 701                         break;
 702                 }
 703                 break;
 704
 705         case ESTAB:
 706                 switch (event) {
 707                 case CLS_ACPT:
 708                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
 709                         sta->reason = reason;
 710                         __mesh_plink_deactivate(sta);
 711                         sta->plink_state = HOLDING;
 712                         llid = sta->llid;
 713                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 714                         spin_unlock_bh(&sta->plink_lock);
 715                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 716                                             plid, reason);
 717                         break;
 718                 case OPN_ACPT:
 719                         llid = sta->llid;
 720                         spin_unlock_bh(&sta->plink_lock);
 721                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 722                                             plid, 0);
 723                         break;
 724                 default:
 725                         spin_unlock_bh(&sta->plink_lock);
 726                         break;
 727                 }
 728                 break;
 729         case HOLDING:
 730                 switch (event) {
 731                 case CLS_ACPT:
 732                         if (del_timer(&sta->plink_timer))
 733                                 sta->ignore_plink_timer = 1;
 734                         mesh_plink_fsm_restart(sta);
 735                         spin_unlock_bh(&sta->plink_lock);
 736                         break;
 737                 case OPN_ACPT:
 738                 case CNF_ACPT:
 739                 case OPN_RJCT:
 740                 case CNF_RJCT:
 741                         llid = sta->llid;
 742                         reason = sta->reason;
 743                         spin_unlock_bh(&sta->plink_lock);
 744                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 745                                             plid, reason);
 746                         break;
 747                 default:
 748                         spin_unlock_bh(&sta->plink_lock);
 749                 }
 750                 break;
 751         default:
 752                 /* should not get here, BLOCKED is dealt with at the beggining
 753                  * of the function
 754                  */
 755                 spin_unlock_bh(&sta->plink_lock);
 756                 break;
 757         }
 758
 759         rcu_read_unlock();
 760 }