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 = PLINK_LISTEN;
  88         sta->llid = sta->plid = sta->reason = 0;
  89         sta->plink_retries = 0;
  90 }
  91
  92 /*
  93  * NOTE: This is just an alias for sta_info_alloc(), see notes
  94  *       on it in the lifecycle management section!
  95  */
  96 static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
  97                                          u8 *hw_addr, u64 rates)
  98 {
  99         struct ieee80211_local *local = sdata->local;
 100         struct sta_info *sta;
 101
 102         if (local->num_sta >= MESH_MAX_PLINKS)
 103                 return NULL;
 104
 105         sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC);
 106         if (!sta)
 107                 return NULL;
 108
 109         sta->flags |= WLAN_STA_AUTHORIZED;
 110         sta->supp_rates[local->hw.conf.channel->band] = rates;
 111
 112         return sta;
 113 }
 114
 115 /**
 116  * mesh_plink_deactivate - deactivate mesh peer link
 117  *
 118  * @sta: mesh peer link to deactivate
 119  *
 120  * All mesh paths with this peer as next hop will be flushed
 121  *
 122  * Locking: the caller must hold sta->plink_lock
 123  */
 124 static void __mesh_plink_deactivate(struct sta_info *sta)
 125 {
 126         struct ieee80211_sub_if_data *sdata = sta->sdata;
 127
 128         if (sta->plink_state == PLINK_ESTAB)
 129                 mesh_plink_dec_estab_count(sdata);
 130         sta->plink_state = PLINK_BLOCKED;
 131         mesh_path_flush_by_nexthop(sta);
 132 }
 133
 134 /**
 135  * __mesh_plink_deactivate - deactivate mesh peer link
 136  *
 137  * @sta: mesh peer link to deactivate
 138  *
 139  * All mesh paths with this peer as next hop will be flushed
 140  */
 141 void mesh_plink_deactivate(struct sta_info *sta)
 142 {
 143         spin_lock_bh(&sta->plink_lock);
 144         __mesh_plink_deactivate(sta);
 145         spin_unlock_bh(&sta->plink_lock);
 146 }
 147
 148 static int mesh_plink_frame_tx(struct net_device *dev,
 149                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
 150                 __le16 reason) {
 151         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 152         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 153         struct ieee80211_mgmt *mgmt;
 154         bool include_plid = false;
 155         u8 *pos;
 156         int ie_len;
 157
 158         if (!skb)
 159                 return -1;
 160         skb_reserve(skb, local->hw.extra_tx_headroom);
 161         /* 25 is the size of the common mgmt part (24) plus the size of the
 162          * common action part (1)
 163          */
 164         mgmt = (struct ieee80211_mgmt *)
 165                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
 166         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
 167         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 168                                            IEEE80211_STYPE_ACTION);
 169         memcpy(mgmt->da, da, ETH_ALEN);
 170         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 171         /* BSSID is left zeroed, wildcard value */
 172         mgmt->u.action.category = PLINK_CATEGORY;
 173         mgmt->u.action.u.plink_action.action_code = action;
 174
 175         if (action == PLINK_CLOSE)
 176                 mgmt->u.action.u.plink_action.aux = reason;
 177         else {
 178                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
 179                 if (action == PLINK_CONFIRM) {
 180                         pos = skb_put(skb, 4);
 181                         /* two-byte status code followed by two-byte AID */
 182                         memset(pos, 0, 4);
 183                 }
 184                 mesh_mgmt_ies_add(skb, dev);
 185         }
 186
 187         /* Add Peer Link Management element */
 188         switch (action) {
 189         case PLINK_OPEN:
 190                 ie_len = 3;
 191                 break;
 192         case PLINK_CONFIRM:
 193                 ie_len = 5;
 194                 include_plid = true;
 195                 break;
 196         case PLINK_CLOSE:
 197         default:
 198                 if (!plid)
 199                         ie_len = 5;
 200                 else {
 201                         ie_len = 7;
 202                         include_plid = true;
 203                 }
 204                 break;
 205         }
 206
 207         pos = skb_put(skb, 2 + ie_len);
 208         *pos++ = WLAN_EID_PEER_LINK;
 209         *pos++ = ie_len;
 210         *pos++ = action;
 211         memcpy(pos, &llid, 2);
 212         if (include_plid) {
 213                 pos += 2;
 214                 memcpy(pos, &plid, 2);
 215         }
 216         if (action == PLINK_CLOSE) {
 217                 pos += 2;
 218                 memcpy(pos, &reason, 2);
 219         }
 220
 221         ieee80211_sta_tx(dev, skb, 0);
 222         return 0;
 223 }
 224
 225 void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev,
 226                            bool peer_accepting_plinks)
 227 {
 228         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 229         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 230         struct sta_info *sta;
 231
 232         rcu_read_lock();
 233
 234         sta = sta_info_get(local, hw_addr);
 235         if (!sta) {
 236                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
 237                 if (!sta) {
 238                         rcu_read_unlock();
 239                         return;
 240                 }
 241                 if (sta_info_insert(sta)) {
 242                         rcu_read_unlock();
 243                         return;
 244                 }
 245         }
 246
 247         sta->last_rx = jiffies;
 248         sta->supp_rates[local->hw.conf.channel->band] = rates;
 249         if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN &&
 250                         sdata->u.sta.accepting_plinks &&
 251                         sdata->u.sta.mshcfg.auto_open_plinks)
 252                 mesh_plink_open(sta);
 253
 254         rcu_read_unlock();
 255 }
 256
 257 static void mesh_plink_timer(unsigned long data)
 258 {
 259         struct sta_info *sta;
 260         __le16 llid, plid, reason;
 261         struct net_device *dev = NULL;
 262         struct ieee80211_sub_if_data *sdata;
 263 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 264         DECLARE_MAC_BUF(mac);
 265 #endif
 266
 267         /*
 268          * This STA is valid because sta_info_destroy() will
 269          * del_timer_sync() this timer after having made sure
 270          * it cannot be readded (by deleting the plink.)
 271          */
 272         sta = (struct sta_info *) data;
 273
 274         spin_lock_bh(&sta->plink_lock);
 275         if (sta->ignore_plink_timer) {
 276                 sta->ignore_plink_timer = false;
 277                 spin_unlock_bh(&sta->plink_lock);
 278                 return;
 279         }
 280         mpl_dbg("Mesh plink timer for %s fired on state %d\n",
 281                         print_mac(mac, sta->addr), sta->plink_state);
 282         reason = 0;
 283         llid = sta->llid;
 284         plid = sta->plid;
 285         sdata = sta->sdata;
 286         dev = sdata->dev;
 287
 288         switch (sta->plink_state) {
 289         case PLINK_OPN_RCVD:
 290         case PLINK_OPN_SNT:
 291                 /* retry timer */
 292                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
 293                         u32 rand;
 294                         mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n",
 295                                         print_mac(mac, sta->addr),
 296                                         sta->plink_retries, sta->plink_timeout);
 297                         get_random_bytes(&rand, sizeof(u32));
 298                         sta->plink_timeout = sta->plink_timeout +
 299                                              rand % sta->plink_timeout;
 300                         ++sta->plink_retries;
 301                         mod_plink_timer(sta, sta->plink_timeout);
 302                         spin_unlock_bh(&sta->plink_lock);
 303                         mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid,
 304                                             0, 0);
 305                         break;
 306                 }
 307                 reason = cpu_to_le16(MESH_MAX_RETRIES);
 308                 /* fall through on else */
 309         case PLINK_CNF_RCVD:
 310                 /* confirm timer */
 311                 if (!reason)
 312                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
 313                 sta->plink_state = PLINK_HOLDING;
 314                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 315                 spin_unlock_bh(&sta->plink_lock);
 316                 mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid,
 317                                     reason);
 318                 break;
 319         case PLINK_HOLDING:
 320                 /* holding timer */
 321                 del_timer(&sta->plink_timer);
 322                 mesh_plink_fsm_restart(sta);
 323                 spin_unlock_bh(&sta->plink_lock);
 324                 break;
 325         default:
 326                 spin_unlock_bh(&sta->plink_lock);
 327                 break;
 328         }
 329 }
 330
 331 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
 332 {
 333         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
 334         sta->plink_timer.data = (unsigned long) sta;
 335         sta->plink_timer.function = mesh_plink_timer;
 336         sta->plink_timeout = timeout;
 337         add_timer(&sta->plink_timer);
 338 }
 339
 340 int mesh_plink_open(struct sta_info *sta)
 341 {
 342         __le16 llid;
 343         struct ieee80211_sub_if_data *sdata = sta->sdata;
 344 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 345         DECLARE_MAC_BUF(mac);
 346 #endif
 347
 348         spin_lock_bh(&sta->plink_lock);
 349         get_random_bytes(&llid, 2);
 350         sta->llid = llid;
 351         if (sta->plink_state != PLINK_LISTEN) {
 352                 spin_unlock_bh(&sta->plink_lock);
 353                 return -EBUSY;
 354         }
 355         sta->plink_state = PLINK_OPN_SNT;
 356         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 357         spin_unlock_bh(&sta->plink_lock);
 358         mpl_dbg("Mesh plink: starting establishment with %s\n",
 359                 print_mac(mac, sta->addr));
 360
 361         return mesh_plink_frame_tx(sdata->dev, PLINK_OPEN,
 362                                    sta->addr, llid, 0, 0);
 363 }
 364
 365 void mesh_plink_block(struct sta_info *sta)
 366 {
 367 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 368         DECLARE_MAC_BUF(mac);
 369 #endif
 370
 371         spin_lock_bh(&sta->plink_lock);
 372         __mesh_plink_deactivate(sta);
 373         sta->plink_state = PLINK_BLOCKED;
 374         spin_unlock_bh(&sta->plink_lock);
 375 }
 376
 377 int mesh_plink_close(struct sta_info *sta)
 378 {
 379         struct ieee80211_sub_if_data *sdata = sta->sdata;
 380         __le16 llid, plid, reason;
 381 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 382         DECLARE_MAC_BUF(mac);
 383 #endif
 384
 385         mpl_dbg("Mesh plink: closing link with %s\n",
 386                         print_mac(mac, sta->addr));
 387         spin_lock_bh(&sta->plink_lock);
 388         sta->reason = cpu_to_le16(MESH_LINK_CANCELLED);
 389         reason = sta->reason;
 390
 391         if (sta->plink_state == PLINK_LISTEN ||
 392             sta->plink_state == PLINK_BLOCKED) {
 393                 mesh_plink_fsm_restart(sta);
 394                 spin_unlock_bh(&sta->plink_lock);
 395                 return 0;
 396         } else if (sta->plink_state == PLINK_ESTAB) {
 397                 __mesh_plink_deactivate(sta);
 398                 /* The timer should not be running */
 399                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 400         } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
 401                 sta->ignore_plink_timer = true;
 402
 403         sta->plink_state = PLINK_HOLDING;
 404         llid = sta->llid;
 405         plid = sta->plid;
 406         spin_unlock_bh(&sta->plink_lock);
 407         mesh_plink_frame_tx(sta->sdata->dev, PLINK_CLOSE, sta->addr, llid,
 408                             plid, reason);
 409         return 0;
 410 }
 411
 412 void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt,
 413                          size_t len, struct ieee80211_rx_status *rx_status)
 414 {
 415         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 416         struct ieee80211_local *local = sdata->local;
 417         struct ieee802_11_elems elems;
 418         struct sta_info *sta;
 419         enum plink_event event;
 420         enum plink_frame_type ftype;
 421         size_t baselen;
 422         u8 ie_len;
 423         u8 *baseaddr;
 424         __le16 plid, llid, reason;
 425 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 426         DECLARE_MAC_BUF(mac);
 427 #endif
 428
 429         if (is_multicast_ether_addr(mgmt->da)) {
 430                 mpl_dbg("Mesh plink: ignore frame from multicast address");
 431                 return;
 432         }
 433
 434         baseaddr = mgmt->u.action.u.plink_action.variable;
 435         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
 436         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
 437                 baseaddr += 4;
 438                 baselen -= 4;
 439         }
 440         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
 441         if (!elems.peer_link) {
 442                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
 443                 return;
 444         }
 445
 446         ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link));
 447         ie_len = elems.peer_link_len;
 448         if ((ftype == PLINK_OPEN && ie_len != 3) ||
 449             (ftype == PLINK_CONFIRM && ie_len != 5) ||
 450             (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) {
 451                 mpl_dbg("Mesh plink: incorrect plink ie length\n");
 452                 return;
 453         }
 454
 455         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
 456                 mpl_dbg("Mesh plink: missing necessary ie\n");
 457                 return;
 458         }
 459         /* Note the lines below are correct, the llid in the frame is the plid
 460          * from the point of view of this host.
 461          */
 462         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
 463         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7))
 464                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
 465
 466         rcu_read_lock();
 467
 468         sta = sta_info_get(local, mgmt->sa);
 469         if (!sta && ftype != PLINK_OPEN) {
 470                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
 471                 rcu_read_unlock();
 472                 return;
 473         }
 474
 475         if (sta && sta->plink_state == PLINK_BLOCKED) {
 476                 rcu_read_unlock();
 477                 return;
 478         }
 479
 480         /* Now we will figure out the appropriate event... */
 481         event = PLINK_UNDEFINED;
 482         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, dev))) {
 483                 switch (ftype) {
 484                 case PLINK_OPEN:
 485                         event = OPN_RJCT;
 486                         break;
 487                 case PLINK_CONFIRM:
 488                         event = CNF_RJCT;
 489                         break;
 490                 case PLINK_CLOSE:
 491                         /* avoid warning */
 492                         break;
 493                 }
 494                 spin_lock_bh(&sta->plink_lock);
 495         } else if (!sta) {
 496                 /* ftype == PLINK_OPEN */
 497                 u64 rates;
 498                 if (!mesh_plink_free_count(sdata)) {
 499                         mpl_dbg("Mesh plink error: no more free plinks\n");
 500                         rcu_read_unlock();
 501                         return;
 502                 }
 503
 504                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
 505                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
 506                 if (!sta) {
 507                         mpl_dbg("Mesh plink error: plink table full\n");
 508                         rcu_read_unlock();
 509                         return;
 510                 }
 511                 if (sta_info_insert(sta)) {
 512                         rcu_read_unlock();
 513                         return;
 514                 }
 515                 event = OPN_ACPT;
 516                 spin_lock_bh(&sta->plink_lock);
 517         } else {
 518                 spin_lock_bh(&sta->plink_lock);
 519                 switch (ftype) {
 520                 case PLINK_OPEN:
 521                         if (!mesh_plink_free_count(sdata) ||
 522                             (sta->plid && sta->plid != plid))
 523                                 event = OPN_IGNR;
 524                         else
 525                                 event = OPN_ACPT;
 526                         break;
 527                 case PLINK_CONFIRM:
 528                         if (!mesh_plink_free_count(sdata) ||
 529                             (sta->llid != llid || sta->plid != plid))
 530                                 event = CNF_IGNR;
 531                         else
 532                                 event = CNF_ACPT;
 533                         break;
 534                 case PLINK_CLOSE:
 535                         if (sta->plink_state == PLINK_ESTAB)
 536                                 /* Do not check for llid or plid. This does not
 537                                  * follow the standard but since multiple plinks
 538                                  * per sta are not supported, it is necessary in
 539                                  * order to avoid a livelock when MP A sees an
 540                                  * establish peer link to MP B but MP B does not
 541                                  * see it. This can be caused by a timeout in
 542                                  * B's peer link establishment or B beign
 543                                  * restarted.
 544                                  */
 545                                 event = CLS_ACPT;
 546                         else if (sta->plid != plid)
 547                                 event = CLS_IGNR;
 548                         else if (ie_len == 7 && sta->llid != llid)
 549                                 event = CLS_IGNR;
 550                         else
 551                                 event = CLS_ACPT;
 552                         break;
 553                 default:
 554                         mpl_dbg("Mesh plink: unknown frame subtype\n");
 555                         spin_unlock_bh(&sta->plink_lock);
 556                         rcu_read_unlock();
 557                         return;
 558                 }
 559         }
 560
 561         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n",
 562                         print_mac(mac, mgmt->sa), sta->plink_state,
 563                         le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
 564                         event);
 565         reason = 0;
 566         switch (sta->plink_state) {
 567                 /* spin_unlock as soon as state is updated at each case */
 568         case PLINK_LISTEN:
 569                 switch (event) {
 570                 case CLS_ACPT:
 571                         mesh_plink_fsm_restart(sta);
 572                         spin_unlock_bh(&sta->plink_lock);
 573                         break;
 574                 case OPN_ACPT:
 575                         sta->plink_state = PLINK_OPN_RCVD;
 576                         sta->plid = plid;
 577                         get_random_bytes(&llid, 2);
 578                         sta->llid = llid;
 579                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 580                         spin_unlock_bh(&sta->plink_lock);
 581                         mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid,
 582                                             0, 0);
 583                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr,
 584                                             llid, plid, 0);
 585                         break;
 586                 default:
 587                         spin_unlock_bh(&sta->plink_lock);
 588                         break;
 589                 }
 590                 break;
 591
 592         case PLINK_OPN_SNT:
 593                 switch (event) {
 594                 case OPN_RJCT:
 595                 case CNF_RJCT:
 596                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 597                 case CLS_ACPT:
 598                         if (!reason)
 599                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 600                         sta->reason = reason;
 601                         sta->plink_state = PLINK_HOLDING;
 602                         if (!mod_plink_timer(sta,
 603                                              dot11MeshHoldingTimeout(sdata)))
 604                                 sta->ignore_plink_timer = true;
 605
 606                         llid = sta->llid;
 607                         spin_unlock_bh(&sta->plink_lock);
 608                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 609                                             plid, reason);
 610                         break;
 611                 case OPN_ACPT:
 612                         /* retry timer is left untouched */
 613                         sta->plink_state = PLINK_OPN_RCVD;
 614                         sta->plid = plid;
 615                         llid = sta->llid;
 616                         spin_unlock_bh(&sta->plink_lock);
 617                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 618                                             plid, 0);
 619                         break;
 620                 case CNF_ACPT:
 621                         sta->plink_state = PLINK_CNF_RCVD;
 622                         if (!mod_plink_timer(sta,
 623                                              dot11MeshConfirmTimeout(sdata)))
 624                                 sta->ignore_plink_timer = true;
 625
 626                         spin_unlock_bh(&sta->plink_lock);
 627                         break;
 628                 default:
 629                         spin_unlock_bh(&sta->plink_lock);
 630                         break;
 631                 }
 632                 break;
 633
 634         case PLINK_OPN_RCVD:
 635                 switch (event) {
 636                 case OPN_RJCT:
 637                 case CNF_RJCT:
 638                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 639                 case CLS_ACPT:
 640                         if (!reason)
 641                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 642                         sta->reason = reason;
 643                         sta->plink_state = PLINK_HOLDING;
 644                         if (!mod_plink_timer(sta,
 645                                              dot11MeshHoldingTimeout(sdata)))
 646                                 sta->ignore_plink_timer = true;
 647
 648                         llid = sta->llid;
 649                         spin_unlock_bh(&sta->plink_lock);
 650                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 651                                             plid, reason);
 652                         break;
 653                 case OPN_ACPT:
 654                         llid = sta->llid;
 655                         spin_unlock_bh(&sta->plink_lock);
 656                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 657                                             plid, 0);
 658                         break;
 659                 case CNF_ACPT:
 660                         del_timer(&sta->plink_timer);
 661                         sta->plink_state = PLINK_ESTAB;
 662                         mesh_plink_inc_estab_count(sdata);
 663                         spin_unlock_bh(&sta->plink_lock);
 664                         mpl_dbg("Mesh plink with %s ESTABLISHED\n",
 665                                         print_mac(mac, sta->addr));
 666                         break;
 667                 default:
 668                         spin_unlock_bh(&sta->plink_lock);
 669                         break;
 670                 }
 671                 break;
 672
 673         case PLINK_CNF_RCVD:
 674                 switch (event) {
 675                 case OPN_RJCT:
 676                 case CNF_RJCT:
 677                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 678                 case CLS_ACPT:
 679                         if (!reason)
 680                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 681                         sta->reason = reason;
 682                         sta->plink_state = PLINK_HOLDING;
 683                         if (!mod_plink_timer(sta,
 684                                              dot11MeshHoldingTimeout(sdata)))
 685                                 sta->ignore_plink_timer = true;
 686
 687                         llid = sta->llid;
 688                         spin_unlock_bh(&sta->plink_lock);
 689                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 690                                             plid, reason);
 691                         break;
 692                 case OPN_ACPT:
 693                         del_timer(&sta->plink_timer);
 694                         sta->plink_state = PLINK_ESTAB;
 695                         mesh_plink_inc_estab_count(sdata);
 696                         spin_unlock_bh(&sta->plink_lock);
 697                         mpl_dbg("Mesh plink with %s ESTABLISHED\n",
 698                                         print_mac(mac, sta->addr));
 699                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 700                                             plid, 0);
 701                         break;
 702                 default:
 703                         spin_unlock_bh(&sta->plink_lock);
 704                         break;
 705                 }
 706                 break;
 707
 708         case PLINK_ESTAB:
 709                 switch (event) {
 710                 case CLS_ACPT:
 711                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
 712                         sta->reason = reason;
 713                         __mesh_plink_deactivate(sta);
 714                         sta->plink_state = PLINK_HOLDING;
 715                         llid = sta->llid;
 716                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 717                         spin_unlock_bh(&sta->plink_lock);
 718                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 719                                             plid, reason);
 720                         break;
 721                 case OPN_ACPT:
 722                         llid = sta->llid;
 723                         spin_unlock_bh(&sta->plink_lock);
 724                         mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid,
 725                                             plid, 0);
 726                         break;
 727                 default:
 728                         spin_unlock_bh(&sta->plink_lock);
 729                         break;
 730                 }
 731                 break;
 732         case PLINK_HOLDING:
 733                 switch (event) {
 734                 case CLS_ACPT:
 735                         if (del_timer(&sta->plink_timer))
 736                                 sta->ignore_plink_timer = 1;
 737                         mesh_plink_fsm_restart(sta);
 738                         spin_unlock_bh(&sta->plink_lock);
 739                         break;
 740                 case OPN_ACPT:
 741                 case CNF_ACPT:
 742                 case OPN_RJCT:
 743                 case CNF_RJCT:
 744                         llid = sta->llid;
 745                         reason = sta->reason;
 746                         spin_unlock_bh(&sta->plink_lock);
 747                         mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 748                                             plid, reason);
 749                         break;
 750                 default:
 751                         spin_unlock_bh(&sta->plink_lock);
 752                 }
 753                 break;
 754         default:
 755                 /* should not get here, PLINK_BLOCKED is dealt with at the
 756                  * beggining of the function
 757                  */
 758                 spin_unlock_bh(&sta->plink_lock);
 759                 break;
 760         }
 761
 762         rcu_read_unlock();
 763 }