net/mac80211/mesh_plink.c

   1 /*
   2  * Copyright (c) 2008, 2009 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 "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 PLINK_GET_LLID(p) (p + 4)
  22 #define PLINK_GET_PLID(p) (p + 6)
  23
  24 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
  25                                 jiffies + HZ * t / 1000))
  26
  27 /* Peer link cancel reasons, all subject to ANA approval */
  28 #define MESH_LINK_CANCELLED                     2
  29 #define MESH_MAX_NEIGHBORS                      3
  30 #define MESH_CAPABILITY_POLICY_VIOLATION        4
  31 #define MESH_CLOSE_RCVD                         5
  32 #define MESH_MAX_RETRIES                        6
  33 #define MESH_CONFIRM_TIMEOUT                    7
  34 #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS  8
  35 #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9
  36 #define MESH_SECURITY_FAILED_VERIFICATION       10
  37
  38 #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries)
  39 #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout)
  40 #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout)
  41 #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout)
  42 #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks)
  43
  44 enum plink_frame_type {
  45         PLINK_OPEN = 0,
  46         PLINK_CONFIRM,
  47         PLINK_CLOSE
  48 };
  49
  50 enum plink_event {
  51         PLINK_UNDEFINED,
  52         OPN_ACPT,
  53         OPN_RJCT,
  54         OPN_IGNR,
  55         CNF_ACPT,
  56         CNF_RJCT,
  57         CNF_IGNR,
  58         CLS_ACPT,
  59         CLS_IGNR
  60 };
  61
  62 static inline
  63 void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
  64 {
  65         atomic_inc(&sdata->u.mesh.mshstats.estab_plinks);
  66         mesh_accept_plinks_update(sdata);
  67         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
  68 }
  69
  70 static inline
  71 void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
  72 {
  73         atomic_dec(&sdata->u.mesh.mshstats.estab_plinks);
  74         mesh_accept_plinks_update(sdata);
  75         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
  76 }
  77
  78 /**
  79  * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
  80  *
  81  * @sta: mesh peer link to restart
  82  *
  83  * Locking: this function must be called holding sta->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, u32 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->sta.supp_rates[local->hw.conf.channel->band] = rates;
 111         rate_control_rate_init(sta);
 112
 113         return sta;
 114 }
 115
 116 /**
 117  * mesh_plink_deactivate - deactivate mesh peer link
 118  *
 119  * @sta: mesh peer link to deactivate
 120  *
 121  * All mesh paths with this peer as next hop will be flushed
 122  *
 123  * Locking: the caller must hold sta->lock
 124  */
 125 static void __mesh_plink_deactivate(struct sta_info *sta)
 126 {
 127         struct ieee80211_sub_if_data *sdata = sta->sdata;
 128
 129         if (sta->plink_state == PLINK_ESTAB)
 130                 mesh_plink_dec_estab_count(sdata);
 131         sta->plink_state = PLINK_BLOCKED;
 132         mesh_path_flush_by_nexthop(sta);
 133 }
 134
 135 /**
 136  * __mesh_plink_deactivate - deactivate mesh peer link
 137  *
 138  * @sta: mesh peer link to deactivate
 139  *
 140  * All mesh paths with this peer as next hop will be flushed
 141  */
 142 void mesh_plink_deactivate(struct sta_info *sta)
 143 {
 144         spin_lock_bh(&sta->lock);
 145         __mesh_plink_deactivate(sta);
 146         spin_unlock_bh(&sta->lock);
 147 }
 148
 149 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
 150                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
 151                 __le16 reason) {
 152         struct ieee80211_local *local = sdata->local;
 153         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 154         struct ieee80211_mgmt *mgmt;
 155         bool include_plid = false;
 156         static const u8 meshpeeringproto[] = { 0x00, 0x0F, 0xAC, 0x2A };
 157         u8 *pos;
 158         int ie_len;
 159
 160         if (!skb)
 161                 return -1;
 162         skb_reserve(skb, local->hw.extra_tx_headroom);
 163         /* 25 is the size of the common mgmt part (24) plus the size of the
 164          * common action part (1)
 165          */
 166         mgmt = (struct ieee80211_mgmt *)
 167                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
 168         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
 169         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 170                                           IEEE80211_STYPE_ACTION);
 171         memcpy(mgmt->da, da, ETH_ALEN);
 172         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 173         /* BSSID is left zeroed, wildcard value */
 174         mgmt->u.action.category = MESH_PLINK_CATEGORY;
 175         mgmt->u.action.u.plink_action.action_code = action;
 176
 177         if (action == PLINK_CLOSE)
 178                 mgmt->u.action.u.plink_action.aux = reason;
 179         else {
 180                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
 181                 if (action == PLINK_CONFIRM) {
 182                         pos = skb_put(skb, 4);
 183                         /* two-byte status code followed by two-byte AID */
 184                         memset(pos, 0, 2);
 185                         memcpy(pos + 2, &plid, 2);
 186                 }
 187                 mesh_mgmt_ies_add(skb, sdata);
 188         }
 189
 190         /* Add Peer Link Management element */
 191         switch (action) {
 192         case PLINK_OPEN:
 193                 ie_len = 6;
 194                 break;
 195         case PLINK_CONFIRM:
 196                 ie_len = 8;
 197                 include_plid = true;
 198                 break;
 199         case PLINK_CLOSE:
 200         default:
 201                 if (!plid)
 202                         ie_len = 8;
 203                 else {
 204                         ie_len = 10;
 205                         include_plid = true;
 206                 }
 207                 break;
 208         }
 209
 210         pos = skb_put(skb, 2 + ie_len);
 211         *pos++ = WLAN_EID_PEER_LINK;
 212         *pos++ = ie_len;
 213         memcpy(pos, meshpeeringproto, sizeof(meshpeeringproto));
 214         pos += 4;
 215         memcpy(pos, &llid, 2);
 216         if (include_plid) {
 217                 pos += 2;
 218                 memcpy(pos, &plid, 2);
 219         }
 220         if (action == PLINK_CLOSE) {
 221                 pos += 2;
 222                 memcpy(pos, &reason, 2);
 223         }
 224
 225         ieee80211_tx_skb(sdata, skb);
 226         return 0;
 227 }
 228
 229 void mesh_neighbour_update(u8 *hw_addr, u32 rates, struct ieee80211_sub_if_data *sdata,
 230                            bool peer_accepting_plinks)
 231 {
 232         struct ieee80211_local *local = sdata->local;
 233         struct sta_info *sta;
 234
 235         rcu_read_lock();
 236
 237         sta = sta_info_get(local, hw_addr);
 238         if (!sta) {
 239                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
 240                 if (!sta) {
 241                         rcu_read_unlock();
 242                         return;
 243                 }
 244                 if (sta_info_insert(sta)) {
 245                         rcu_read_unlock();
 246                         return;
 247                 }
 248         }
 249
 250         sta->last_rx = jiffies;
 251         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
 252         if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN &&
 253                         sdata->u.mesh.accepting_plinks &&
 254                         sdata->u.mesh.mshcfg.auto_open_plinks)
 255                 mesh_plink_open(sta);
 256
 257         rcu_read_unlock();
 258 }
 259
 260 static void mesh_plink_timer(unsigned long data)
 261 {
 262         struct sta_info *sta;
 263         __le16 llid, plid, reason;
 264         struct ieee80211_sub_if_data *sdata;
 265
 266         /*
 267          * This STA is valid because sta_info_destroy() will
 268          * del_timer_sync() this timer after having made sure
 269          * it cannot be readded (by deleting the plink.)
 270          */
 271         sta = (struct sta_info *) data;
 272
 273         if (sta->sdata->local->quiescing) {
 274                 sta->plink_timer_was_running = true;
 275                 return;
 276         }
 277
 278         spin_lock_bh(&sta->lock);
 279         if (sta->ignore_plink_timer) {
 280                 sta->ignore_plink_timer = false;
 281                 spin_unlock_bh(&sta->lock);
 282                 return;
 283         }
 284         mpl_dbg("Mesh plink timer for %pM fired on state %d\n",
 285                 sta->sta.addr, sta->plink_state);
 286         reason = 0;
 287         llid = sta->llid;
 288         plid = sta->plid;
 289         sdata = sta->sdata;
 290
 291         switch (sta->plink_state) {
 292         case PLINK_OPN_RCVD:
 293         case PLINK_OPN_SNT:
 294                 /* retry timer */
 295                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
 296                         u32 rand;
 297                         mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n",
 298                                 sta->sta.addr, sta->plink_retries,
 299                                 sta->plink_timeout);
 300                         get_random_bytes(&rand, sizeof(u32));
 301                         sta->plink_timeout = sta->plink_timeout +
 302                                              rand % sta->plink_timeout;
 303                         ++sta->plink_retries;
 304                         mod_plink_timer(sta, sta->plink_timeout);
 305                         spin_unlock_bh(&sta->lock);
 306                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
 307                                             0, 0);
 308                         break;
 309                 }
 310                 reason = cpu_to_le16(MESH_MAX_RETRIES);
 311                 /* fall through on else */
 312         case PLINK_CNF_RCVD:
 313                 /* confirm timer */
 314                 if (!reason)
 315                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
 316                 sta->plink_state = PLINK_HOLDING;
 317                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 318                 spin_unlock_bh(&sta->lock);
 319                 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid,
 320                                     reason);
 321                 break;
 322         case PLINK_HOLDING:
 323                 /* holding timer */
 324                 del_timer(&sta->plink_timer);
 325                 mesh_plink_fsm_restart(sta);
 326                 spin_unlock_bh(&sta->lock);
 327                 break;
 328         default:
 329                 spin_unlock_bh(&sta->lock);
 330                 break;
 331         }
 332 }
 333
 334 #ifdef CONFIG_PM
 335 void mesh_plink_quiesce(struct sta_info *sta)
 336 {
 337         if (del_timer_sync(&sta->plink_timer))
 338                 sta->plink_timer_was_running = true;
 339 }
 340
 341 void mesh_plink_restart(struct sta_info *sta)
 342 {
 343         if (sta->plink_timer_was_running) {
 344                 add_timer(&sta->plink_timer);
 345                 sta->plink_timer_was_running = false;
 346         }
 347 }
 348 #endif
 349
 350 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
 351 {
 352         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
 353         sta->plink_timer.data = (unsigned long) sta;
 354         sta->plink_timer.function = mesh_plink_timer;
 355         sta->plink_timeout = timeout;
 356         add_timer(&sta->plink_timer);
 357 }
 358
 359 int mesh_plink_open(struct sta_info *sta)
 360 {
 361         __le16 llid;
 362         struct ieee80211_sub_if_data *sdata = sta->sdata;
 363
 364         spin_lock_bh(&sta->lock);
 365         get_random_bytes(&llid, 2);
 366         sta->llid = llid;
 367         if (sta->plink_state != PLINK_LISTEN) {
 368                 spin_unlock_bh(&sta->lock);
 369                 return -EBUSY;
 370         }
 371         sta->plink_state = PLINK_OPN_SNT;
 372         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 373         spin_unlock_bh(&sta->lock);
 374         mpl_dbg("Mesh plink: starting establishment with %pM\n",
 375                 sta->sta.addr);
 376
 377         return mesh_plink_frame_tx(sdata, PLINK_OPEN,
 378                                    sta->sta.addr, llid, 0, 0);
 379 }
 380
 381 void mesh_plink_block(struct sta_info *sta)
 382 {
 383         spin_lock_bh(&sta->lock);
 384         __mesh_plink_deactivate(sta);
 385         sta->plink_state = PLINK_BLOCKED;
 386         spin_unlock_bh(&sta->lock);
 387 }
 388
 389
 390 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
 391                          size_t len, struct ieee80211_rx_status *rx_status)
 392 {
 393         struct ieee80211_local *local = sdata->local;
 394         struct ieee802_11_elems elems;
 395         struct sta_info *sta;
 396         enum plink_event event;
 397         enum plink_frame_type ftype;
 398         size_t baselen;
 399         u8 ie_len;
 400         u8 *baseaddr;
 401         __le16 plid, llid, reason;
 402 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
 403         static const char *mplstates[] = {
 404                 [PLINK_LISTEN] = "LISTEN",
 405                 [PLINK_OPN_SNT] = "OPN-SNT",
 406                 [PLINK_OPN_RCVD] = "OPN-RCVD",
 407                 [PLINK_CNF_RCVD] = "CNF_RCVD",
 408                 [PLINK_ESTAB] = "ESTAB",
 409                 [PLINK_HOLDING] = "HOLDING",
 410                 [PLINK_BLOCKED] = "BLOCKED"
 411         };
 412 #endif
 413
 414         /* need action_code, aux */
 415         if (len < IEEE80211_MIN_ACTION_SIZE + 3)
 416                 return;
 417
 418         if (is_multicast_ether_addr(mgmt->da)) {
 419                 mpl_dbg("Mesh plink: ignore frame from multicast address");
 420                 return;
 421         }
 422
 423         baseaddr = mgmt->u.action.u.plink_action.variable;
 424         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
 425         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
 426                 baseaddr += 4;
 427                 baselen += 4;
 428         }
 429         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
 430         if (!elems.peer_link) {
 431                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
 432                 return;
 433         }
 434
 435         ftype = mgmt->u.action.u.plink_action.action_code;
 436         ie_len = elems.peer_link_len;
 437         if ((ftype == PLINK_OPEN && ie_len != 6) ||
 438             (ftype == PLINK_CONFIRM && ie_len != 8) ||
 439             (ftype == PLINK_CLOSE && ie_len != 8 && ie_len != 10)) {
 440                 mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n",
 441                     ftype, ie_len);
 442                 return;
 443         }
 444
 445         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
 446                 mpl_dbg("Mesh plink: missing necessary ie\n");
 447                 return;
 448         }
 449         /* Note the lines below are correct, the llid in the frame is the plid
 450          * from the point of view of this host.
 451          */
 452         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
 453         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 10))
 454                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
 455
 456         rcu_read_lock();
 457
 458         sta = sta_info_get(local, mgmt->sa);
 459         if (!sta && ftype != PLINK_OPEN) {
 460                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
 461                 rcu_read_unlock();
 462                 return;
 463         }
 464
 465         if (sta && sta->plink_state == PLINK_BLOCKED) {
 466                 rcu_read_unlock();
 467                 return;
 468         }
 469
 470         /* Now we will figure out the appropriate event... */
 471         event = PLINK_UNDEFINED;
 472         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) {
 473                 switch (ftype) {
 474                 case PLINK_OPEN:
 475                         event = OPN_RJCT;
 476                         break;
 477                 case PLINK_CONFIRM:
 478                         event = CNF_RJCT;
 479                         break;
 480                 case PLINK_CLOSE:
 481                         /* avoid warning */
 482                         break;
 483                 }
 484                 spin_lock_bh(&sta->lock);
 485         } else if (!sta) {
 486                 /* ftype == PLINK_OPEN */
 487                 u32 rates;
 488                 if (!mesh_plink_free_count(sdata)) {
 489                         mpl_dbg("Mesh plink error: no more free plinks\n");
 490                         rcu_read_unlock();
 491                         return;
 492                 }
 493
 494                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
 495                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
 496                 if (!sta) {
 497                         mpl_dbg("Mesh plink error: plink table full\n");
 498                         rcu_read_unlock();
 499                         return;
 500                 }
 501                 if (sta_info_insert(sta)) {
 502                         rcu_read_unlock();
 503                         return;
 504                 }
 505                 event = OPN_ACPT;
 506                 spin_lock_bh(&sta->lock);
 507         } else {
 508                 spin_lock_bh(&sta->lock);
 509                 switch (ftype) {
 510                 case PLINK_OPEN:
 511                         if (!mesh_plink_free_count(sdata) ||
 512                             (sta->plid && sta->plid != plid))
 513                                 event = OPN_IGNR;
 514                         else
 515                                 event = OPN_ACPT;
 516                         break;
 517                 case PLINK_CONFIRM:
 518                         if (!mesh_plink_free_count(sdata) ||
 519                             (sta->llid != llid || sta->plid != plid))
 520                                 event = CNF_IGNR;
 521                         else
 522                                 event = CNF_ACPT;
 523                         break;
 524                 case PLINK_CLOSE:
 525                         if (sta->plink_state == PLINK_ESTAB)
 526                                 /* Do not check for llid or plid. This does not
 527                                  * follow the standard but since multiple plinks
 528                                  * per sta are not supported, it is necessary in
 529                                  * order to avoid a livelock when MP A sees an
 530                                  * establish peer link to MP B but MP B does not
 531                                  * see it. This can be caused by a timeout in
 532                                  * B's peer link establishment or B beign
 533                                  * restarted.
 534                                  */
 535                                 event = CLS_ACPT;
 536                         else if (sta->plid != plid)
 537                                 event = CLS_IGNR;
 538                         else if (ie_len == 7 && sta->llid != llid)
 539                                 event = CLS_IGNR;
 540                         else
 541                                 event = CLS_ACPT;
 542                         break;
 543                 default:
 544                         mpl_dbg("Mesh plink: unknown frame subtype\n");
 545                         spin_unlock_bh(&sta->lock);
 546                         rcu_read_unlock();
 547                         return;
 548                 }
 549         }
 550
 551         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
 552                 mgmt->sa, mplstates[sta->plink_state],
 553                 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
 554                 event);
 555         reason = 0;
 556         switch (sta->plink_state) {
 557                 /* spin_unlock as soon as state is updated at each case */
 558         case PLINK_LISTEN:
 559                 switch (event) {
 560                 case CLS_ACPT:
 561                         mesh_plink_fsm_restart(sta);
 562                         spin_unlock_bh(&sta->lock);
 563                         break;
 564                 case OPN_ACPT:
 565                         sta->plink_state = PLINK_OPN_RCVD;
 566                         sta->plid = plid;
 567                         get_random_bytes(&llid, 2);
 568                         sta->llid = llid;
 569                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
 570                         spin_unlock_bh(&sta->lock);
 571                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
 572                                             0, 0);
 573                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr,
 574                                             llid, plid, 0);
 575                         break;
 576                 default:
 577                         spin_unlock_bh(&sta->lock);
 578                         break;
 579                 }
 580                 break;
 581
 582         case PLINK_OPN_SNT:
 583                 switch (event) {
 584                 case OPN_RJCT:
 585                 case CNF_RJCT:
 586                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 587                 case CLS_ACPT:
 588                         if (!reason)
 589                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 590                         sta->reason = reason;
 591                         sta->plink_state = PLINK_HOLDING;
 592                         if (!mod_plink_timer(sta,
 593                                              dot11MeshHoldingTimeout(sdata)))
 594                                 sta->ignore_plink_timer = true;
 595
 596                         llid = sta->llid;
 597                         spin_unlock_bh(&sta->lock);
 598                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 599                                             plid, reason);
 600                         break;
 601                 case OPN_ACPT:
 602                         /* retry timer is left untouched */
 603                         sta->plink_state = PLINK_OPN_RCVD;
 604                         sta->plid = plid;
 605                         llid = sta->llid;
 606                         spin_unlock_bh(&sta->lock);
 607                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 608                                             plid, 0);
 609                         break;
 610                 case CNF_ACPT:
 611                         sta->plink_state = PLINK_CNF_RCVD;
 612                         if (!mod_plink_timer(sta,
 613                                              dot11MeshConfirmTimeout(sdata)))
 614                                 sta->ignore_plink_timer = true;
 615
 616                         spin_unlock_bh(&sta->lock);
 617                         break;
 618                 default:
 619                         spin_unlock_bh(&sta->lock);
 620                         break;
 621                 }
 622                 break;
 623
 624         case PLINK_OPN_RCVD:
 625                 switch (event) {
 626                 case OPN_RJCT:
 627                 case CNF_RJCT:
 628                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 629                 case CLS_ACPT:
 630                         if (!reason)
 631                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 632                         sta->reason = reason;
 633                         sta->plink_state = PLINK_HOLDING;
 634                         if (!mod_plink_timer(sta,
 635                                              dot11MeshHoldingTimeout(sdata)))
 636                                 sta->ignore_plink_timer = true;
 637
 638                         llid = sta->llid;
 639                         spin_unlock_bh(&sta->lock);
 640                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 641                                             plid, reason);
 642                         break;
 643                 case OPN_ACPT:
 644                         llid = sta->llid;
 645                         spin_unlock_bh(&sta->lock);
 646                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 647                                             plid, 0);
 648                         break;
 649                 case CNF_ACPT:
 650                         del_timer(&sta->plink_timer);
 651                         sta->plink_state = PLINK_ESTAB;
 652                         mesh_plink_inc_estab_count(sdata);
 653                         spin_unlock_bh(&sta->lock);
 654                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
 655                                 sta->sta.addr);
 656                         break;
 657                 default:
 658                         spin_unlock_bh(&sta->lock);
 659                         break;
 660                 }
 661                 break;
 662
 663         case PLINK_CNF_RCVD:
 664                 switch (event) {
 665                 case OPN_RJCT:
 666                 case CNF_RJCT:
 667                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
 668                 case CLS_ACPT:
 669                         if (!reason)
 670                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
 671                         sta->reason = reason;
 672                         sta->plink_state = PLINK_HOLDING;
 673                         if (!mod_plink_timer(sta,
 674                                              dot11MeshHoldingTimeout(sdata)))
 675                                 sta->ignore_plink_timer = true;
 676
 677                         llid = sta->llid;
 678                         spin_unlock_bh(&sta->lock);
 679                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 680                                             plid, reason);
 681                         break;
 682                 case OPN_ACPT:
 683                         del_timer(&sta->plink_timer);
 684                         sta->plink_state = PLINK_ESTAB;
 685                         mesh_plink_inc_estab_count(sdata);
 686                         spin_unlock_bh(&sta->lock);
 687                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
 688                                 sta->sta.addr);
 689                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 690                                             plid, 0);
 691                         break;
 692                 default:
 693                         spin_unlock_bh(&sta->lock);
 694                         break;
 695                 }
 696                 break;
 697
 698         case PLINK_ESTAB:
 699                 switch (event) {
 700                 case CLS_ACPT:
 701                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
 702                         sta->reason = reason;
 703                         __mesh_plink_deactivate(sta);
 704                         sta->plink_state = PLINK_HOLDING;
 705                         llid = sta->llid;
 706                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
 707                         spin_unlock_bh(&sta->lock);
 708                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
 709                                             plid, reason);
 710                         break;
 711                 case OPN_ACPT:
 712                         llid = sta->llid;
 713                         spin_unlock_bh(&sta->lock);
 714                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
 715                                             plid, 0);
 716                         break;
 717                 default:
 718                         spin_unlock_bh(&sta->lock);
 719                         break;
 720                 }
 721                 break;
 722         case PLINK_HOLDING:
 723                 switch (event) {
 724                 case CLS_ACPT:
 725                         if (del_timer(&sta->plink_timer))
 726                                 sta->ignore_plink_timer = 1;
 727                         mesh_plink_fsm_restart(sta);
 728                         spin_unlock_bh(&sta->lock);
 729                         break;
 730                 case OPN_ACPT:
 731                 case CNF_ACPT:
 732                 case OPN_RJCT:
 733                 case CNF_RJCT:
 734                         llid = sta->llid;
 735                         reason = sta->reason;
 736                         spin_unlock_bh(&sta->lock);
 737                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr,
 738                                             llid, plid, reason);
 739                         break;
 740                 default:
 741                         spin_unlock_bh(&sta->lock);
 742                 }
 743                 break;
 744         default:
 745                 /* should not get here, PLINK_BLOCKED is dealt with at the
 746                  * beggining of the function
 747                  */
 748                 spin_unlock_bh(&sta->lock);
 749                 break;
 750         }
 751
 752         rcu_read_unlock();
 753 }