mac80211: initialize RC data for all mesh links upon allocation
[linux-2.6.git] / 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 "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_FRAME_SUBTYPE(p) (p)
22 #define PLINK_GET_LLID(p) (p + 1)
23 #define PLINK_GET_PLID(p) (p + 3)
24
25 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
26                                 jiffies + HZ * t / 1000))
27
28 /* Peer link cancel reasons, all subject to ANA approval */
29 #define MESH_LINK_CANCELLED                     2
30 #define MESH_MAX_NEIGHBORS                      3
31 #define MESH_CAPABILITY_POLICY_VIOLATION        4
32 #define MESH_CLOSE_RCVD                         5
33 #define MESH_MAX_RETRIES                        6
34 #define MESH_CONFIRM_TIMEOUT                    7
35 #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS  8
36 #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9
37 #define MESH_SECURITY_FAILED_VERIFICATION       10
38
39 #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries)
40 #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout)
41 #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout)
42 #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout)
43 #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks)
44
45 enum plink_frame_type {
46         PLINK_OPEN = 0,
47         PLINK_CONFIRM,
48         PLINK_CLOSE
49 };
50
51 enum plink_event {
52         PLINK_UNDEFINED,
53         OPN_ACPT,
54         OPN_RJCT,
55         OPN_IGNR,
56         CNF_ACPT,
57         CNF_RJCT,
58         CNF_IGNR,
59         CLS_ACPT,
60         CLS_IGNR
61 };
62
63 static inline
64 void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
65 {
66         atomic_inc(&sdata->u.mesh.mshstats.estab_plinks);
67         mesh_accept_plinks_update(sdata);
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 }
76
77 /**
78  * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
79  *
80  * @sta: mes peer link to restart
81  *
82  * Locking: this function must be called holding sta->lock
83  */
84 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
85 {
86         sta->plink_state = PLINK_LISTEN;
87         sta->llid = sta->plid = sta->reason = 0;
88         sta->plink_retries = 0;
89 }
90
91 /*
92  * NOTE: This is just an alias for sta_info_alloc(), see notes
93  *       on it in the lifecycle management section!
94  */
95 static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
96                                          u8 *hw_addr, u64 rates)
97 {
98         struct ieee80211_local *local = sdata->local;
99         struct sta_info *sta;
100
101         if (local->num_sta >= MESH_MAX_PLINKS)
102                 return NULL;
103
104         sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC);
105         if (!sta)
106                 return NULL;
107
108         sta->flags = WLAN_STA_AUTHORIZED;
109         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
110         rate_control_rate_init(sta);
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->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->lock);
144         __mesh_plink_deactivate(sta);
145         spin_unlock_bh(&sta->lock);
146 }
147
148 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
149                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
150                 __le16 reason) {
151         struct ieee80211_local *local = sdata->local;
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 = cpu_to_le16(IEEE80211_FTYPE_MGMT |
168                                           IEEE80211_STYPE_ACTION);
169         memcpy(mgmt->da, da, ETH_ALEN);
170         memcpy(mgmt->sa, sdata->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, sdata);
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_tx_skb(sdata, skb, 0);
222         return 0;
223 }
224
225 void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct ieee80211_sub_if_data *sdata,
226                            bool peer_accepting_plinks)
227 {
228         struct ieee80211_local *local = sdata->local;
229         struct sta_info *sta;
230
231         rcu_read_lock();
232
233         sta = sta_info_get(local, hw_addr);
234         if (!sta) {
235                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
236                 if (!sta) {
237                         rcu_read_unlock();
238                         return;
239                 }
240                 if (sta_info_insert(sta)) {
241                         rcu_read_unlock();
242                         return;
243                 }
244         }
245
246         sta->last_rx = jiffies;
247         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
248         if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN &&
249                         sdata->u.mesh.accepting_plinks &&
250                         sdata->u.mesh.mshcfg.auto_open_plinks)
251                 mesh_plink_open(sta);
252
253         rcu_read_unlock();
254 }
255
256 static void mesh_plink_timer(unsigned long data)
257 {
258         struct sta_info *sta;
259         __le16 llid, plid, reason;
260         struct ieee80211_sub_if_data *sdata;
261
262         /*
263          * This STA is valid because sta_info_destroy() will
264          * del_timer_sync() this timer after having made sure
265          * it cannot be readded (by deleting the plink.)
266          */
267         sta = (struct sta_info *) data;
268
269         spin_lock_bh(&sta->lock);
270         if (sta->ignore_plink_timer) {
271                 sta->ignore_plink_timer = false;
272                 spin_unlock_bh(&sta->lock);
273                 return;
274         }
275         mpl_dbg("Mesh plink timer for %pM fired on state %d\n",
276                 sta->sta.addr, sta->plink_state);
277         reason = 0;
278         llid = sta->llid;
279         plid = sta->plid;
280         sdata = sta->sdata;
281
282         switch (sta->plink_state) {
283         case PLINK_OPN_RCVD:
284         case PLINK_OPN_SNT:
285                 /* retry timer */
286                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
287                         u32 rand;
288                         mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n",
289                                 sta->sta.addr, sta->plink_retries,
290                                 sta->plink_timeout);
291                         get_random_bytes(&rand, sizeof(u32));
292                         sta->plink_timeout = sta->plink_timeout +
293                                              rand % sta->plink_timeout;
294                         ++sta->plink_retries;
295                         mod_plink_timer(sta, sta->plink_timeout);
296                         spin_unlock_bh(&sta->lock);
297                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
298                                             0, 0);
299                         break;
300                 }
301                 reason = cpu_to_le16(MESH_MAX_RETRIES);
302                 /* fall through on else */
303         case PLINK_CNF_RCVD:
304                 /* confirm timer */
305                 if (!reason)
306                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
307                 sta->plink_state = PLINK_HOLDING;
308                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
309                 spin_unlock_bh(&sta->lock);
310                 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid,
311                                     reason);
312                 break;
313         case PLINK_HOLDING:
314                 /* holding timer */
315                 del_timer(&sta->plink_timer);
316                 mesh_plink_fsm_restart(sta);
317                 spin_unlock_bh(&sta->lock);
318                 break;
319         default:
320                 spin_unlock_bh(&sta->lock);
321                 break;
322         }
323 }
324
325 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
326 {
327         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
328         sta->plink_timer.data = (unsigned long) sta;
329         sta->plink_timer.function = mesh_plink_timer;
330         sta->plink_timeout = timeout;
331         add_timer(&sta->plink_timer);
332 }
333
334 int mesh_plink_open(struct sta_info *sta)
335 {
336         __le16 llid;
337         struct ieee80211_sub_if_data *sdata = sta->sdata;
338
339         spin_lock_bh(&sta->lock);
340         get_random_bytes(&llid, 2);
341         sta->llid = llid;
342         if (sta->plink_state != PLINK_LISTEN) {
343                 spin_unlock_bh(&sta->lock);
344                 return -EBUSY;
345         }
346         sta->plink_state = PLINK_OPN_SNT;
347         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
348         spin_unlock_bh(&sta->lock);
349         mpl_dbg("Mesh plink: starting establishment with %pM\n",
350                 sta->sta.addr);
351
352         return mesh_plink_frame_tx(sdata, PLINK_OPEN,
353                                    sta->sta.addr, llid, 0, 0);
354 }
355
356 void mesh_plink_block(struct sta_info *sta)
357 {
358         spin_lock_bh(&sta->lock);
359         __mesh_plink_deactivate(sta);
360         sta->plink_state = PLINK_BLOCKED;
361         spin_unlock_bh(&sta->lock);
362 }
363
364 int mesh_plink_close(struct sta_info *sta)
365 {
366         struct ieee80211_sub_if_data *sdata = sta->sdata;
367         __le16 llid, plid, reason;
368
369         mpl_dbg("Mesh plink: closing link with %pM\n", sta->sta.addr);
370         spin_lock_bh(&sta->lock);
371         sta->reason = cpu_to_le16(MESH_LINK_CANCELLED);
372         reason = sta->reason;
373
374         if (sta->plink_state == PLINK_LISTEN ||
375             sta->plink_state == PLINK_BLOCKED) {
376                 mesh_plink_fsm_restart(sta);
377                 spin_unlock_bh(&sta->lock);
378                 return 0;
379         } else if (sta->plink_state == PLINK_ESTAB) {
380                 __mesh_plink_deactivate(sta);
381                 /* The timer should not be running */
382                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
383         } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
384                 sta->ignore_plink_timer = true;
385
386         sta->plink_state = PLINK_HOLDING;
387         llid = sta->llid;
388         plid = sta->plid;
389         spin_unlock_bh(&sta->lock);
390         mesh_plink_frame_tx(sta->sdata, PLINK_CLOSE, sta->sta.addr, llid,
391                             plid, reason);
392         return 0;
393 }
394
395 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
396                          size_t len, struct ieee80211_rx_status *rx_status)
397 {
398         struct ieee80211_local *local = sdata->local;
399         struct ieee802_11_elems elems;
400         struct sta_info *sta;
401         enum plink_event event;
402         enum plink_frame_type ftype;
403         size_t baselen;
404         u8 ie_len;
405         u8 *baseaddr;
406         __le16 plid, llid, reason;
407
408         /* need action_code, aux */
409         if (len < IEEE80211_MIN_ACTION_SIZE + 3)
410                 return;
411
412         if (is_multicast_ether_addr(mgmt->da)) {
413                 mpl_dbg("Mesh plink: ignore frame from multicast address");
414                 return;
415         }
416
417         baseaddr = mgmt->u.action.u.plink_action.variable;
418         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
419         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
420                 baseaddr += 4;
421                 baselen -= 4;
422         }
423         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
424         if (!elems.peer_link) {
425                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
426                 return;
427         }
428
429         ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link));
430         ie_len = elems.peer_link_len;
431         if ((ftype == PLINK_OPEN && ie_len != 3) ||
432             (ftype == PLINK_CONFIRM && ie_len != 5) ||
433             (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) {
434                 mpl_dbg("Mesh plink: incorrect plink ie length\n");
435                 return;
436         }
437
438         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
439                 mpl_dbg("Mesh plink: missing necessary ie\n");
440                 return;
441         }
442         /* Note the lines below are correct, the llid in the frame is the plid
443          * from the point of view of this host.
444          */
445         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
446         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7))
447                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
448
449         rcu_read_lock();
450
451         sta = sta_info_get(local, mgmt->sa);
452         if (!sta && ftype != PLINK_OPEN) {
453                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
454                 rcu_read_unlock();
455                 return;
456         }
457
458         if (sta && sta->plink_state == PLINK_BLOCKED) {
459                 rcu_read_unlock();
460                 return;
461         }
462
463         /* Now we will figure out the appropriate event... */
464         event = PLINK_UNDEFINED;
465         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) {
466                 switch (ftype) {
467                 case PLINK_OPEN:
468                         event = OPN_RJCT;
469                         break;
470                 case PLINK_CONFIRM:
471                         event = CNF_RJCT;
472                         break;
473                 case PLINK_CLOSE:
474                         /* avoid warning */
475                         break;
476                 }
477                 spin_lock_bh(&sta->lock);
478         } else if (!sta) {
479                 /* ftype == PLINK_OPEN */
480                 u64 rates;
481                 if (!mesh_plink_free_count(sdata)) {
482                         mpl_dbg("Mesh plink error: no more free plinks\n");
483                         rcu_read_unlock();
484                         return;
485                 }
486
487                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
488                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
489                 if (!sta) {
490                         mpl_dbg("Mesh plink error: plink table full\n");
491                         rcu_read_unlock();
492                         return;
493                 }
494                 if (sta_info_insert(sta)) {
495                         rcu_read_unlock();
496                         return;
497                 }
498                 event = OPN_ACPT;
499                 spin_lock_bh(&sta->lock);
500         } else {
501                 spin_lock_bh(&sta->lock);
502                 switch (ftype) {
503                 case PLINK_OPEN:
504                         if (!mesh_plink_free_count(sdata) ||
505                             (sta->plid && sta->plid != plid))
506                                 event = OPN_IGNR;
507                         else
508                                 event = OPN_ACPT;
509                         break;
510                 case PLINK_CONFIRM:
511                         if (!mesh_plink_free_count(sdata) ||
512                             (sta->llid != llid || sta->plid != plid))
513                                 event = CNF_IGNR;
514                         else
515                                 event = CNF_ACPT;
516                         break;
517                 case PLINK_CLOSE:
518                         if (sta->plink_state == PLINK_ESTAB)
519                                 /* Do not check for llid or plid. This does not
520                                  * follow the standard but since multiple plinks
521                                  * per sta are not supported, it is necessary in
522                                  * order to avoid a livelock when MP A sees an
523                                  * establish peer link to MP B but MP B does not
524                                  * see it. This can be caused by a timeout in
525                                  * B's peer link establishment or B beign
526                                  * restarted.
527                                  */
528                                 event = CLS_ACPT;
529                         else if (sta->plid != plid)
530                                 event = CLS_IGNR;
531                         else if (ie_len == 7 && sta->llid != llid)
532                                 event = CLS_IGNR;
533                         else
534                                 event = CLS_ACPT;
535                         break;
536                 default:
537                         mpl_dbg("Mesh plink: unknown frame subtype\n");
538                         spin_unlock_bh(&sta->lock);
539                         rcu_read_unlock();
540                         return;
541                 }
542         }
543
544         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %d %d %d %d\n",
545                 mgmt->sa, sta->plink_state,
546                 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
547                 event);
548         reason = 0;
549         switch (sta->plink_state) {
550                 /* spin_unlock as soon as state is updated at each case */
551         case PLINK_LISTEN:
552                 switch (event) {
553                 case CLS_ACPT:
554                         mesh_plink_fsm_restart(sta);
555                         spin_unlock_bh(&sta->lock);
556                         break;
557                 case OPN_ACPT:
558                         sta->plink_state = PLINK_OPN_RCVD;
559                         sta->plid = plid;
560                         get_random_bytes(&llid, 2);
561                         sta->llid = llid;
562                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
563                         spin_unlock_bh(&sta->lock);
564                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
565                                             0, 0);
566                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr,
567                                             llid, plid, 0);
568                         break;
569                 default:
570                         spin_unlock_bh(&sta->lock);
571                         break;
572                 }
573                 break;
574
575         case PLINK_OPN_SNT:
576                 switch (event) {
577                 case OPN_RJCT:
578                 case CNF_RJCT:
579                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
580                 case CLS_ACPT:
581                         if (!reason)
582                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
583                         sta->reason = reason;
584                         sta->plink_state = PLINK_HOLDING;
585                         if (!mod_plink_timer(sta,
586                                              dot11MeshHoldingTimeout(sdata)))
587                                 sta->ignore_plink_timer = true;
588
589                         llid = sta->llid;
590                         spin_unlock_bh(&sta->lock);
591                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
592                                             plid, reason);
593                         break;
594                 case OPN_ACPT:
595                         /* retry timer is left untouched */
596                         sta->plink_state = PLINK_OPN_RCVD;
597                         sta->plid = plid;
598                         llid = sta->llid;
599                         spin_unlock_bh(&sta->lock);
600                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
601                                             plid, 0);
602                         break;
603                 case CNF_ACPT:
604                         sta->plink_state = PLINK_CNF_RCVD;
605                         if (!mod_plink_timer(sta,
606                                              dot11MeshConfirmTimeout(sdata)))
607                                 sta->ignore_plink_timer = true;
608
609                         spin_unlock_bh(&sta->lock);
610                         break;
611                 default:
612                         spin_unlock_bh(&sta->lock);
613                         break;
614                 }
615                 break;
616
617         case PLINK_OPN_RCVD:
618                 switch (event) {
619                 case OPN_RJCT:
620                 case CNF_RJCT:
621                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
622                 case CLS_ACPT:
623                         if (!reason)
624                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
625                         sta->reason = reason;
626                         sta->plink_state = PLINK_HOLDING;
627                         if (!mod_plink_timer(sta,
628                                              dot11MeshHoldingTimeout(sdata)))
629                                 sta->ignore_plink_timer = true;
630
631                         llid = sta->llid;
632                         spin_unlock_bh(&sta->lock);
633                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
634                                             plid, reason);
635                         break;
636                 case OPN_ACPT:
637                         llid = sta->llid;
638                         spin_unlock_bh(&sta->lock);
639                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
640                                             plid, 0);
641                         break;
642                 case CNF_ACPT:
643                         del_timer(&sta->plink_timer);
644                         sta->plink_state = PLINK_ESTAB;
645                         mesh_plink_inc_estab_count(sdata);
646                         spin_unlock_bh(&sta->lock);
647                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
648                                 sta->sta.addr);
649                         break;
650                 default:
651                         spin_unlock_bh(&sta->lock);
652                         break;
653                 }
654                 break;
655
656         case PLINK_CNF_RCVD:
657                 switch (event) {
658                 case OPN_RJCT:
659                 case CNF_RJCT:
660                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
661                 case CLS_ACPT:
662                         if (!reason)
663                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
664                         sta->reason = reason;
665                         sta->plink_state = PLINK_HOLDING;
666                         if (!mod_plink_timer(sta,
667                                              dot11MeshHoldingTimeout(sdata)))
668                                 sta->ignore_plink_timer = true;
669
670                         llid = sta->llid;
671                         spin_unlock_bh(&sta->lock);
672                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
673                                             plid, reason);
674                         break;
675                 case OPN_ACPT:
676                         del_timer(&sta->plink_timer);
677                         sta->plink_state = PLINK_ESTAB;
678                         mesh_plink_inc_estab_count(sdata);
679                         spin_unlock_bh(&sta->lock);
680                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
681                                 sta->sta.addr);
682                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
683                                             plid, 0);
684                         break;
685                 default:
686                         spin_unlock_bh(&sta->lock);
687                         break;
688                 }
689                 break;
690
691         case PLINK_ESTAB:
692                 switch (event) {
693                 case CLS_ACPT:
694                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
695                         sta->reason = reason;
696                         __mesh_plink_deactivate(sta);
697                         sta->plink_state = PLINK_HOLDING;
698                         llid = sta->llid;
699                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
700                         spin_unlock_bh(&sta->lock);
701                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
702                                             plid, reason);
703                         break;
704                 case OPN_ACPT:
705                         llid = sta->llid;
706                         spin_unlock_bh(&sta->lock);
707                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
708                                             plid, 0);
709                         break;
710                 default:
711                         spin_unlock_bh(&sta->lock);
712                         break;
713                 }
714                 break;
715         case PLINK_HOLDING:
716                 switch (event) {
717                 case CLS_ACPT:
718                         if (del_timer(&sta->plink_timer))
719                                 sta->ignore_plink_timer = 1;
720                         mesh_plink_fsm_restart(sta);
721                         spin_unlock_bh(&sta->lock);
722                         break;
723                 case OPN_ACPT:
724                 case CNF_ACPT:
725                 case OPN_RJCT:
726                 case CNF_RJCT:
727                         llid = sta->llid;
728                         reason = sta->reason;
729                         spin_unlock_bh(&sta->lock);
730                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr,
731                                             llid, plid, reason);
732                         break;
733                 default:
734                         spin_unlock_bh(&sta->lock);
735                 }
736                 break;
737         default:
738                 /* should not get here, PLINK_BLOCKED is dealt with at the
739                  * beggining of the function
740                  */
741                 spin_unlock_bh(&sta->lock);
742                 break;
743         }
744
745         rcu_read_unlock();
746 }