Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / 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
111         return sta;
112 }
113
114 /**
115  * mesh_plink_deactivate - deactivate mesh peer link
116  *
117  * @sta: mesh peer link to deactivate
118  *
119  * All mesh paths with this peer as next hop will be flushed
120  *
121  * Locking: the caller must hold sta->lock
122  */
123 static void __mesh_plink_deactivate(struct sta_info *sta)
124 {
125         struct ieee80211_sub_if_data *sdata = sta->sdata;
126
127         if (sta->plink_state == PLINK_ESTAB)
128                 mesh_plink_dec_estab_count(sdata);
129         sta->plink_state = PLINK_BLOCKED;
130         mesh_path_flush_by_nexthop(sta);
131 }
132
133 /**
134  * __mesh_plink_deactivate - deactivate mesh peer link
135  *
136  * @sta: mesh peer link to deactivate
137  *
138  * All mesh paths with this peer as next hop will be flushed
139  */
140 void mesh_plink_deactivate(struct sta_info *sta)
141 {
142         spin_lock_bh(&sta->lock);
143         __mesh_plink_deactivate(sta);
144         spin_unlock_bh(&sta->lock);
145 }
146
147 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
148                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
149                 __le16 reason) {
150         struct ieee80211_local *local = sdata->local;
151         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
152         struct ieee80211_mgmt *mgmt;
153         bool include_plid = false;
154         u8 *pos;
155         int ie_len;
156
157         if (!skb)
158                 return -1;
159         skb_reserve(skb, local->hw.extra_tx_headroom);
160         /* 25 is the size of the common mgmt part (24) plus the size of the
161          * common action part (1)
162          */
163         mgmt = (struct ieee80211_mgmt *)
164                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
165         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
166         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
167                                           IEEE80211_STYPE_ACTION);
168         memcpy(mgmt->da, da, ETH_ALEN);
169         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
170         /* BSSID is left zeroed, wildcard value */
171         mgmt->u.action.category = PLINK_CATEGORY;
172         mgmt->u.action.u.plink_action.action_code = action;
173
174         if (action == PLINK_CLOSE)
175                 mgmt->u.action.u.plink_action.aux = reason;
176         else {
177                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
178                 if (action == PLINK_CONFIRM) {
179                         pos = skb_put(skb, 4);
180                         /* two-byte status code followed by two-byte AID */
181                         memset(pos, 0, 4);
182                 }
183                 mesh_mgmt_ies_add(skb, sdata);
184         }
185
186         /* Add Peer Link Management element */
187         switch (action) {
188         case PLINK_OPEN:
189                 ie_len = 3;
190                 break;
191         case PLINK_CONFIRM:
192                 ie_len = 5;
193                 include_plid = true;
194                 break;
195         case PLINK_CLOSE:
196         default:
197                 if (!plid)
198                         ie_len = 5;
199                 else {
200                         ie_len = 7;
201                         include_plid = true;
202                 }
203                 break;
204         }
205
206         pos = skb_put(skb, 2 + ie_len);
207         *pos++ = WLAN_EID_PEER_LINK;
208         *pos++ = ie_len;
209         *pos++ = action;
210         memcpy(pos, &llid, 2);
211         if (include_plid) {
212                 pos += 2;
213                 memcpy(pos, &plid, 2);
214         }
215         if (action == PLINK_CLOSE) {
216                 pos += 2;
217                 memcpy(pos, &reason, 2);
218         }
219
220         ieee80211_tx_skb(sdata, skb, 0);
221         return 0;
222 }
223
224 void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct ieee80211_sub_if_data *sdata,
225                            bool peer_accepting_plinks)
226 {
227         struct ieee80211_local *local = sdata->local;
228         struct sta_info *sta;
229
230         rcu_read_lock();
231
232         sta = sta_info_get(local, hw_addr);
233         if (!sta) {
234                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
235                 if (!sta) {
236                         rcu_read_unlock();
237                         return;
238                 }
239                 if (sta_info_insert(sta)) {
240                         rcu_read_unlock();
241                         return;
242                 }
243         }
244
245         sta->last_rx = jiffies;
246         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
247         if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN &&
248                         sdata->u.mesh.accepting_plinks &&
249                         sdata->u.mesh.mshcfg.auto_open_plinks)
250                 mesh_plink_open(sta);
251
252         rcu_read_unlock();
253 }
254
255 static void mesh_plink_timer(unsigned long data)
256 {
257         struct sta_info *sta;
258         __le16 llid, plid, reason;
259         struct ieee80211_sub_if_data *sdata;
260
261         /*
262          * This STA is valid because sta_info_destroy() will
263          * del_timer_sync() this timer after having made sure
264          * it cannot be readded (by deleting the plink.)
265          */
266         sta = (struct sta_info *) data;
267
268         spin_lock_bh(&sta->lock);
269         if (sta->ignore_plink_timer) {
270                 sta->ignore_plink_timer = false;
271                 spin_unlock_bh(&sta->lock);
272                 return;
273         }
274         mpl_dbg("Mesh plink timer for %pM fired on state %d\n",
275                 sta->sta.addr, sta->plink_state);
276         reason = 0;
277         llid = sta->llid;
278         plid = sta->plid;
279         sdata = sta->sdata;
280
281         switch (sta->plink_state) {
282         case PLINK_OPN_RCVD:
283         case PLINK_OPN_SNT:
284                 /* retry timer */
285                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
286                         u32 rand;
287                         mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n",
288                                 sta->sta.addr, sta->plink_retries,
289                                 sta->plink_timeout);
290                         get_random_bytes(&rand, sizeof(u32));
291                         sta->plink_timeout = sta->plink_timeout +
292                                              rand % sta->plink_timeout;
293                         ++sta->plink_retries;
294                         mod_plink_timer(sta, sta->plink_timeout);
295                         spin_unlock_bh(&sta->lock);
296                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
297                                             0, 0);
298                         break;
299                 }
300                 reason = cpu_to_le16(MESH_MAX_RETRIES);
301                 /* fall through on else */
302         case PLINK_CNF_RCVD:
303                 /* confirm timer */
304                 if (!reason)
305                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
306                 sta->plink_state = PLINK_HOLDING;
307                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
308                 spin_unlock_bh(&sta->lock);
309                 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid,
310                                     reason);
311                 break;
312         case PLINK_HOLDING:
313                 /* holding timer */
314                 del_timer(&sta->plink_timer);
315                 mesh_plink_fsm_restart(sta);
316                 spin_unlock_bh(&sta->lock);
317                 break;
318         default:
319                 spin_unlock_bh(&sta->lock);
320                 break;
321         }
322 }
323
324 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
325 {
326         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
327         sta->plink_timer.data = (unsigned long) sta;
328         sta->plink_timer.function = mesh_plink_timer;
329         sta->plink_timeout = timeout;
330         add_timer(&sta->plink_timer);
331 }
332
333 int mesh_plink_open(struct sta_info *sta)
334 {
335         __le16 llid;
336         struct ieee80211_sub_if_data *sdata = sta->sdata;
337
338         spin_lock_bh(&sta->lock);
339         get_random_bytes(&llid, 2);
340         sta->llid = llid;
341         if (sta->plink_state != PLINK_LISTEN) {
342                 spin_unlock_bh(&sta->lock);
343                 return -EBUSY;
344         }
345         sta->plink_state = PLINK_OPN_SNT;
346         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
347         spin_unlock_bh(&sta->lock);
348         mpl_dbg("Mesh plink: starting establishment with %pM\n",
349                 sta->sta.addr);
350
351         return mesh_plink_frame_tx(sdata, PLINK_OPEN,
352                                    sta->sta.addr, llid, 0, 0);
353 }
354
355 void mesh_plink_block(struct sta_info *sta)
356 {
357         spin_lock_bh(&sta->lock);
358         __mesh_plink_deactivate(sta);
359         sta->plink_state = PLINK_BLOCKED;
360         spin_unlock_bh(&sta->lock);
361 }
362
363 int mesh_plink_close(struct sta_info *sta)
364 {
365         struct ieee80211_sub_if_data *sdata = sta->sdata;
366         __le16 llid, plid, reason;
367
368         mpl_dbg("Mesh plink: closing link with %pM\n", sta->sta.addr);
369         spin_lock_bh(&sta->lock);
370         sta->reason = cpu_to_le16(MESH_LINK_CANCELLED);
371         reason = sta->reason;
372
373         if (sta->plink_state == PLINK_LISTEN ||
374             sta->plink_state == PLINK_BLOCKED) {
375                 mesh_plink_fsm_restart(sta);
376                 spin_unlock_bh(&sta->lock);
377                 return 0;
378         } else if (sta->plink_state == PLINK_ESTAB) {
379                 __mesh_plink_deactivate(sta);
380                 /* The timer should not be running */
381                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
382         } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)))
383                 sta->ignore_plink_timer = true;
384
385         sta->plink_state = PLINK_HOLDING;
386         llid = sta->llid;
387         plid = sta->plid;
388         spin_unlock_bh(&sta->lock);
389         mesh_plink_frame_tx(sta->sdata, PLINK_CLOSE, sta->sta.addr, llid,
390                             plid, reason);
391         return 0;
392 }
393
394 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
395                          size_t len, struct ieee80211_rx_status *rx_status)
396 {
397         struct ieee80211_local *local = sdata->local;
398         struct ieee802_11_elems elems;
399         struct sta_info *sta;
400         enum plink_event event;
401         enum plink_frame_type ftype;
402         size_t baselen;
403         u8 ie_len;
404         u8 *baseaddr;
405         __le16 plid, llid, reason;
406
407         /* need action_code, aux */
408         if (len < IEEE80211_MIN_ACTION_SIZE + 3)
409                 return;
410
411         if (is_multicast_ether_addr(mgmt->da)) {
412                 mpl_dbg("Mesh plink: ignore frame from multicast address");
413                 return;
414         }
415
416         baseaddr = mgmt->u.action.u.plink_action.variable;
417         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
418         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
419                 baseaddr += 4;
420                 baselen -= 4;
421         }
422         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
423         if (!elems.peer_link) {
424                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
425                 return;
426         }
427
428         ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link));
429         ie_len = elems.peer_link_len;
430         if ((ftype == PLINK_OPEN && ie_len != 3) ||
431             (ftype == PLINK_CONFIRM && ie_len != 5) ||
432             (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) {
433                 mpl_dbg("Mesh plink: incorrect plink ie length\n");
434                 return;
435         }
436
437         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
438                 mpl_dbg("Mesh plink: missing necessary ie\n");
439                 return;
440         }
441         /* Note the lines below are correct, the llid in the frame is the plid
442          * from the point of view of this host.
443          */
444         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
445         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7))
446                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
447
448         rcu_read_lock();
449
450         sta = sta_info_get(local, mgmt->sa);
451         if (!sta && ftype != PLINK_OPEN) {
452                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
453                 rcu_read_unlock();
454                 return;
455         }
456
457         if (sta && sta->plink_state == PLINK_BLOCKED) {
458                 rcu_read_unlock();
459                 return;
460         }
461
462         /* Now we will figure out the appropriate event... */
463         event = PLINK_UNDEFINED;
464         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) {
465                 switch (ftype) {
466                 case PLINK_OPEN:
467                         event = OPN_RJCT;
468                         break;
469                 case PLINK_CONFIRM:
470                         event = CNF_RJCT;
471                         break;
472                 case PLINK_CLOSE:
473                         /* avoid warning */
474                         break;
475                 }
476                 spin_lock_bh(&sta->lock);
477         } else if (!sta) {
478                 /* ftype == PLINK_OPEN */
479                 u64 rates;
480                 if (!mesh_plink_free_count(sdata)) {
481                         mpl_dbg("Mesh plink error: no more free plinks\n");
482                         rcu_read_unlock();
483                         return;
484                 }
485
486                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
487                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
488                 if (!sta) {
489                         mpl_dbg("Mesh plink error: plink table full\n");
490                         rcu_read_unlock();
491                         return;
492                 }
493                 if (sta_info_insert(sta)) {
494                         rcu_read_unlock();
495                         return;
496                 }
497                 event = OPN_ACPT;
498                 spin_lock_bh(&sta->lock);
499         } else {
500                 spin_lock_bh(&sta->lock);
501                 switch (ftype) {
502                 case PLINK_OPEN:
503                         if (!mesh_plink_free_count(sdata) ||
504                             (sta->plid && sta->plid != plid))
505                                 event = OPN_IGNR;
506                         else
507                                 event = OPN_ACPT;
508                         break;
509                 case PLINK_CONFIRM:
510                         if (!mesh_plink_free_count(sdata) ||
511                             (sta->llid != llid || sta->plid != plid))
512                                 event = CNF_IGNR;
513                         else
514                                 event = CNF_ACPT;
515                         break;
516                 case PLINK_CLOSE:
517                         if (sta->plink_state == PLINK_ESTAB)
518                                 /* Do not check for llid or plid. This does not
519                                  * follow the standard but since multiple plinks
520                                  * per sta are not supported, it is necessary in
521                                  * order to avoid a livelock when MP A sees an
522                                  * establish peer link to MP B but MP B does not
523                                  * see it. This can be caused by a timeout in
524                                  * B's peer link establishment or B beign
525                                  * restarted.
526                                  */
527                                 event = CLS_ACPT;
528                         else if (sta->plid != plid)
529                                 event = CLS_IGNR;
530                         else if (ie_len == 7 && sta->llid != llid)
531                                 event = CLS_IGNR;
532                         else
533                                 event = CLS_ACPT;
534                         break;
535                 default:
536                         mpl_dbg("Mesh plink: unknown frame subtype\n");
537                         spin_unlock_bh(&sta->lock);
538                         rcu_read_unlock();
539                         return;
540                 }
541         }
542
543         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %d %d %d %d\n",
544                 mgmt->sa, sta->plink_state,
545                 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
546                 event);
547         reason = 0;
548         switch (sta->plink_state) {
549                 /* spin_unlock as soon as state is updated at each case */
550         case PLINK_LISTEN:
551                 switch (event) {
552                 case CLS_ACPT:
553                         mesh_plink_fsm_restart(sta);
554                         spin_unlock_bh(&sta->lock);
555                         break;
556                 case OPN_ACPT:
557                         sta->plink_state = PLINK_OPN_RCVD;
558                         sta->plid = plid;
559                         get_random_bytes(&llid, 2);
560                         sta->llid = llid;
561                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
562                         spin_unlock_bh(&sta->lock);
563                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
564                                             0, 0);
565                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr,
566                                             llid, plid, 0);
567                         break;
568                 default:
569                         spin_unlock_bh(&sta->lock);
570                         break;
571                 }
572                 break;
573
574         case PLINK_OPN_SNT:
575                 switch (event) {
576                 case OPN_RJCT:
577                 case CNF_RJCT:
578                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
579                 case CLS_ACPT:
580                         if (!reason)
581                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
582                         sta->reason = reason;
583                         sta->plink_state = PLINK_HOLDING;
584                         if (!mod_plink_timer(sta,
585                                              dot11MeshHoldingTimeout(sdata)))
586                                 sta->ignore_plink_timer = true;
587
588                         llid = sta->llid;
589                         spin_unlock_bh(&sta->lock);
590                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
591                                             plid, reason);
592                         break;
593                 case OPN_ACPT:
594                         /* retry timer is left untouched */
595                         sta->plink_state = PLINK_OPN_RCVD;
596                         sta->plid = plid;
597                         llid = sta->llid;
598                         spin_unlock_bh(&sta->lock);
599                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
600                                             plid, 0);
601                         break;
602                 case CNF_ACPT:
603                         sta->plink_state = PLINK_CNF_RCVD;
604                         if (!mod_plink_timer(sta,
605                                              dot11MeshConfirmTimeout(sdata)))
606                                 sta->ignore_plink_timer = true;
607
608                         spin_unlock_bh(&sta->lock);
609                         break;
610                 default:
611                         spin_unlock_bh(&sta->lock);
612                         break;
613                 }
614                 break;
615
616         case PLINK_OPN_RCVD:
617                 switch (event) {
618                 case OPN_RJCT:
619                 case CNF_RJCT:
620                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
621                 case CLS_ACPT:
622                         if (!reason)
623                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
624                         sta->reason = reason;
625                         sta->plink_state = PLINK_HOLDING;
626                         if (!mod_plink_timer(sta,
627                                              dot11MeshHoldingTimeout(sdata)))
628                                 sta->ignore_plink_timer = true;
629
630                         llid = sta->llid;
631                         spin_unlock_bh(&sta->lock);
632                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
633                                             plid, reason);
634                         break;
635                 case OPN_ACPT:
636                         llid = sta->llid;
637                         spin_unlock_bh(&sta->lock);
638                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
639                                             plid, 0);
640                         break;
641                 case CNF_ACPT:
642                         del_timer(&sta->plink_timer);
643                         sta->plink_state = PLINK_ESTAB;
644                         mesh_plink_inc_estab_count(sdata);
645                         spin_unlock_bh(&sta->lock);
646                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
647                                 sta->sta.addr);
648                         break;
649                 default:
650                         spin_unlock_bh(&sta->lock);
651                         break;
652                 }
653                 break;
654
655         case PLINK_CNF_RCVD:
656                 switch (event) {
657                 case OPN_RJCT:
658                 case CNF_RJCT:
659                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
660                 case CLS_ACPT:
661                         if (!reason)
662                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
663                         sta->reason = reason;
664                         sta->plink_state = PLINK_HOLDING;
665                         if (!mod_plink_timer(sta,
666                                              dot11MeshHoldingTimeout(sdata)))
667                                 sta->ignore_plink_timer = true;
668
669                         llid = sta->llid;
670                         spin_unlock_bh(&sta->lock);
671                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
672                                             plid, reason);
673                         break;
674                 case OPN_ACPT:
675                         del_timer(&sta->plink_timer);
676                         sta->plink_state = PLINK_ESTAB;
677                         mesh_plink_inc_estab_count(sdata);
678                         spin_unlock_bh(&sta->lock);
679                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
680                                 sta->sta.addr);
681                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
682                                             plid, 0);
683                         break;
684                 default:
685                         spin_unlock_bh(&sta->lock);
686                         break;
687                 }
688                 break;
689
690         case PLINK_ESTAB:
691                 switch (event) {
692                 case CLS_ACPT:
693                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
694                         sta->reason = reason;
695                         __mesh_plink_deactivate(sta);
696                         sta->plink_state = PLINK_HOLDING;
697                         llid = sta->llid;
698                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
699                         spin_unlock_bh(&sta->lock);
700                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
701                                             plid, reason);
702                         break;
703                 case OPN_ACPT:
704                         llid = sta->llid;
705                         spin_unlock_bh(&sta->lock);
706                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
707                                             plid, 0);
708                         break;
709                 default:
710                         spin_unlock_bh(&sta->lock);
711                         break;
712                 }
713                 break;
714         case PLINK_HOLDING:
715                 switch (event) {
716                 case CLS_ACPT:
717                         if (del_timer(&sta->plink_timer))
718                                 sta->ignore_plink_timer = 1;
719                         mesh_plink_fsm_restart(sta);
720                         spin_unlock_bh(&sta->lock);
721                         break;
722                 case OPN_ACPT:
723                 case CNF_ACPT:
724                 case OPN_RJCT:
725                 case CNF_RJCT:
726                         llid = sta->llid;
727                         reason = sta->reason;
728                         spin_unlock_bh(&sta->lock);
729                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr,
730                                             llid, plid, reason);
731                         break;
732                 default:
733                         spin_unlock_bh(&sta->lock);
734                 }
735                 break;
736         default:
737                 /* should not get here, PLINK_BLOCKED is dealt with at the
738                  * beggining of the function
739                  */
740                 spin_unlock_bh(&sta->lock);
741                 break;
742         }
743
744         rcu_read_unlock();
745 }