7985e51508987393667dad0feb934bbdec0d09b0
[linux-2.6.git] / 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->vif.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(sdata, 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(sdata, 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 }