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[SCSI] qla2xxx: Add setting of driver version string for vendor application.
[linux-2.6/btrfs-unstable.git] / net / mac80211 / mesh_plink.c
blob02c05fa15c203b9a51dc576579f7455979fe0376
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/gfp.h>
10 #include <linux/kernel.h>
11 #include <linux/random.h>
12 #include "ieee80211_i.h"
13 #include "rate.h"
14 #include "mesh.h"
15
16 #define PLINK_GET_LLID(p) (p + 2)
17 #define PLINK_GET_PLID(p) (p + 4)
18
19 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
20 jiffies + HZ * t / 1000))
21
22 /* We only need a valid sta if user configured a minimum rssi_threshold. */
23 #define rssi_threshold_check(sta, sdata) \
24 (sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\
25 (sta && (s8) -ewma_read(&sta->avg_signal) > \
26 sdata->u.mesh.mshcfg.rssi_threshold))
27
28 enum plink_event {
29 PLINK_UNDEFINED,
30 OPN_ACPT,
31 OPN_RJCT,
32 OPN_IGNR,
33 CNF_ACPT,
34 CNF_RJCT,
35 CNF_IGNR,
36 CLS_ACPT,
37 CLS_IGNR
38 };
39
40 static const char * const mplstates[] = {
41 [NL80211_PLINK_LISTEN] = "LISTEN",
42 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
43 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
44 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
45 [NL80211_PLINK_ESTAB] = "ESTAB",
46 [NL80211_PLINK_HOLDING] = "HOLDING",
47 [NL80211_PLINK_BLOCKED] = "BLOCKED"
48 };
49
50 static const char * const mplevents[] = {
51 [PLINK_UNDEFINED] = "NONE",
52 [OPN_ACPT] = "OPN_ACPT",
53 [OPN_RJCT] = "OPN_RJCT",
54 [OPN_IGNR] = "OPN_IGNR",
55 [CNF_ACPT] = "CNF_ACPT",
56 [CNF_RJCT] = "CNF_RJCT",
57 [CNF_IGNR] = "CNF_IGNR",
58 [CLS_ACPT] = "CLS_ACPT",
59 [CLS_IGNR] = "CLS_IGNR"
60 };
61
62 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
63 enum ieee80211_self_protected_actioncode action,
64 u8 *da, __le16 llid, __le16 plid, __le16 reason);
65
66 /**
67 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
68 *
69 * @sta: mesh peer link to restart
70 *
71 * Locking: this function must be called holding sta->lock
72 */
73 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
74 {
75 sta->plink_state = NL80211_PLINK_LISTEN;
76 sta->llid = sta->plid = sta->reason = 0;
77 sta->plink_retries = 0;
78 }
79
80 /*
81 * mesh_set_short_slot_time - enable / disable ERP short slot time.
82 *
83 * The standard indirectly mandates mesh STAs to turn off short slot time by
84 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
85 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
86 * MBSS support ERP rates.
87 *
88 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
89 */
90 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
91 {
92 struct ieee80211_local *local = sdata->local;
93 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
94 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
95 struct sta_info *sta;
96 u32 erp_rates = 0, changed = 0;
97 int i;
98 bool short_slot = false;
99
100 if (band == IEEE80211_BAND_5GHZ) {
101 /* (IEEE 802.11-2012 19.4.5) */
102 short_slot = true;
103 goto out;
104 } else if (band != IEEE80211_BAND_2GHZ ||
105 (band == IEEE80211_BAND_2GHZ &&
106 local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
107 goto out;
108
109 for (i = 0; i < sband->n_bitrates; i++)
110 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
111 erp_rates |= BIT(i);
112
113 if (!erp_rates)
114 goto out;
115
116 rcu_read_lock();
117 list_for_each_entry_rcu(sta, &local->sta_list, list) {
118 if (sdata != sta->sdata ||
119 sta->plink_state != NL80211_PLINK_ESTAB)
120 continue;
121
122 short_slot = false;
123 if (erp_rates & sta->sta.supp_rates[band])
124 short_slot = true;
125 else
126 break;
127 }
128 rcu_read_unlock();
129
130 out:
131 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
132 sdata->vif.bss_conf.use_short_slot = short_slot;
133 changed = BSS_CHANGED_ERP_SLOT;
134 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
135 sdata->vif.addr, short_slot);
136 }
137 return changed;
138 }
139
140 /**
141 * mesh_set_ht_prot_mode - set correct HT protection mode
142 *
143 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
144 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
145 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
146 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
147 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
148 * HT20 peer is present. Otherwise no-protection mode is selected.
149 */
150 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
151 {
152 struct ieee80211_local *local = sdata->local;
153 struct sta_info *sta;
154 u16 ht_opmode;
155 bool non_ht_sta = false, ht20_sta = false;
156
157 switch (sdata->vif.bss_conf.chandef.width) {
158 case NL80211_CHAN_WIDTH_20_NOHT:
159 case NL80211_CHAN_WIDTH_5:
160 case NL80211_CHAN_WIDTH_10:
161 return 0;
162 default:
163 break;
164 }
165
166 rcu_read_lock();
167 list_for_each_entry_rcu(sta, &local->sta_list, list) {
168 if (sdata != sta->sdata ||
169 sta->plink_state != NL80211_PLINK_ESTAB)
170 continue;
171
172 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
173 continue;
174
175 if (!sta->sta.ht_cap.ht_supported) {
176 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
177 sta->sta.addr);
178 non_ht_sta = true;
179 break;
180 }
181
182 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
183 ht20_sta = true;
184 }
185 rcu_read_unlock();
186
187 if (non_ht_sta)
188 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
189 else if (ht20_sta &&
190 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
191 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
192 else
193 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
194
195 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
196 return 0;
197
198 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
199 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
200 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
201 return BSS_CHANGED_HT;
202 }
203
204 /**
205 * __mesh_plink_deactivate - deactivate mesh peer link
206 *
207 * @sta: mesh peer link to deactivate
208 *
209 * All mesh paths with this peer as next hop will be flushed
210 * Returns beacon changed flag if the beacon content changed.
211 *
212 * Locking: the caller must hold sta->lock
213 */
214 static u32 __mesh_plink_deactivate(struct sta_info *sta)
215 {
216 struct ieee80211_sub_if_data *sdata = sta->sdata;
217 u32 changed = 0;
218
219 if (sta->plink_state == NL80211_PLINK_ESTAB)
220 changed = mesh_plink_dec_estab_count(sdata);
221 sta->plink_state = NL80211_PLINK_BLOCKED;
222 mesh_path_flush_by_nexthop(sta);
223
224 ieee80211_mps_sta_status_update(sta);
225 changed |= ieee80211_mps_local_status_update(sdata);
226
227 return changed;
228 }
229
230 /**
231 * mesh_plink_deactivate - deactivate mesh peer link
232 *
233 * @sta: mesh peer link to deactivate
234 *
235 * All mesh paths with this peer as next hop will be flushed
236 */
237 u32 mesh_plink_deactivate(struct sta_info *sta)
238 {
239 struct ieee80211_sub_if_data *sdata = sta->sdata;
240 u32 changed;
241
242 spin_lock_bh(&sta->lock);
243 changed = __mesh_plink_deactivate(sta);
244 sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED);
245 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
246 sta->sta.addr, sta->llid, sta->plid,
247 sta->reason);
248 spin_unlock_bh(&sta->lock);
249
250 return changed;
251 }
252
253 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
254 enum ieee80211_self_protected_actioncode action,
255 u8 *da, __le16 llid, __le16 plid, __le16 reason)
256 {
257 struct ieee80211_local *local = sdata->local;
258 struct sk_buff *skb;
259 struct ieee80211_tx_info *info;
260 struct ieee80211_mgmt *mgmt;
261 bool include_plid = false;
262 u16 peering_proto = 0;
263 u8 *pos, ie_len = 4;
264 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
265 sizeof(mgmt->u.action.u.self_prot);
266 int err = -ENOMEM;
267
268 skb = dev_alloc_skb(local->tx_headroom +
269 hdr_len +
270 2 + /* capability info */
271 2 + /* AID */
272 2 + 8 + /* supported rates */
273 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
274 2 + sdata->u.mesh.mesh_id_len +
275 2 + sizeof(struct ieee80211_meshconf_ie) +
276 2 + sizeof(struct ieee80211_ht_cap) +
277 2 + sizeof(struct ieee80211_ht_operation) +
278 2 + 8 + /* peering IE */
279 sdata->u.mesh.ie_len);
280 if (!skb)
281 return -1;
282 info = IEEE80211_SKB_CB(skb);
283 skb_reserve(skb, local->tx_headroom);
284 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
285 memset(mgmt, 0, hdr_len);
286 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
287 IEEE80211_STYPE_ACTION);
288 memcpy(mgmt->da, da, ETH_ALEN);
289 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
290 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
291 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
292 mgmt->u.action.u.self_prot.action_code = action;
293
294 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
295 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
296
297 /* capability info */
298 pos = skb_put(skb, 2);
299 memset(pos, 0, 2);
300 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
301 /* AID */
302 pos = skb_put(skb, 2);
303 memcpy(pos + 2, &plid, 2);
304 }
305 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
306 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
307 mesh_add_rsn_ie(sdata, skb) ||
308 mesh_add_meshid_ie(sdata, skb) ||
309 mesh_add_meshconf_ie(sdata, skb))
310 goto free;
311 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
312 info->flags |= IEEE80211_TX_CTL_NO_ACK;
313 if (mesh_add_meshid_ie(sdata, skb))
314 goto free;
315 }
316
317 /* Add Mesh Peering Management element */
318 switch (action) {
319 case WLAN_SP_MESH_PEERING_OPEN:
320 break;
321 case WLAN_SP_MESH_PEERING_CONFIRM:
322 ie_len += 2;
323 include_plid = true;
324 break;
325 case WLAN_SP_MESH_PEERING_CLOSE:
326 if (plid) {
327 ie_len += 2;
328 include_plid = true;
329 }
330 ie_len += 2; /* reason code */
331 break;
332 default:
333 err = -EINVAL;
334 goto free;
335 }
336
337 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
338 goto free;
339
340 pos = skb_put(skb, 2 + ie_len);
341 *pos++ = WLAN_EID_PEER_MGMT;
342 *pos++ = ie_len;
343 memcpy(pos, &peering_proto, 2);
344 pos += 2;
345 memcpy(pos, &llid, 2);
346 pos += 2;
347 if (include_plid) {
348 memcpy(pos, &plid, 2);
349 pos += 2;
350 }
351 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
352 memcpy(pos, &reason, 2);
353 pos += 2;
354 }
355
356 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
357 if (mesh_add_ht_cap_ie(sdata, skb) ||
358 mesh_add_ht_oper_ie(sdata, skb))
359 goto free;
360 }
361
362 if (mesh_add_vendor_ies(sdata, skb))
363 goto free;
364
365 ieee80211_tx_skb(sdata, skb);
366 return 0;
367 free:
368 kfree_skb(skb);
369 return err;
370 }
371
372 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
373 struct sta_info *sta,
374 struct ieee802_11_elems *elems, bool insert)
375 {
376 struct ieee80211_local *local = sdata->local;
377 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
378 struct ieee80211_supported_band *sband;
379 u32 rates, basic_rates = 0, changed = 0;
380
381 sband = local->hw.wiphy->bands[band];
382 rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates);
383
384 spin_lock_bh(&sta->lock);
385 sta->last_rx = jiffies;
386
387 /* rates and capabilities don't change during peering */
388 if (sta->plink_state == NL80211_PLINK_ESTAB)
389 goto out;
390
391 if (sta->sta.supp_rates[band] != rates)
392 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
393 sta->sta.supp_rates[band] = rates;
394
395 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
396 elems->ht_cap_elem, sta))
397 changed |= IEEE80211_RC_BW_CHANGED;
398
399 /* HT peer is operating 20MHz-only */
400 if (elems->ht_operation &&
401 !(elems->ht_operation->ht_param &
402 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
403 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
404 changed |= IEEE80211_RC_BW_CHANGED;
405 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
406 }
407
408 if (insert)
409 rate_control_rate_init(sta);
410 else
411 rate_control_rate_update(local, sband, sta, changed);
412 out:
413 spin_unlock_bh(&sta->lock);
414 }
415
416 static struct sta_info *
417 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
418 {
419 struct sta_info *sta;
420
421 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
422 return NULL;
423
424 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
425 if (!sta)
426 return NULL;
427
428 sta->plink_state = NL80211_PLINK_LISTEN;
429
430 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
431 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
432 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
433
434 set_sta_flag(sta, WLAN_STA_WME);
435
436 return sta;
437 }
438
439 static struct sta_info *
440 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
441 struct ieee802_11_elems *elems)
442 {
443 struct sta_info *sta = NULL;
444
445 /* Userspace handles station allocation */
446 if (sdata->u.mesh.user_mpm ||
447 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
448 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
449 elems->ie_start,
450 elems->total_len,
451 GFP_KERNEL);
452 else
453 sta = __mesh_sta_info_alloc(sdata, addr);
454
455 return sta;
456 }
457
458 /*
459 * mesh_sta_info_get - return mesh sta info entry for @addr.
460 *
461 * @sdata: local meshif
462 * @addr: peer's address
463 * @elems: IEs from beacon or mesh peering frame.
464 *
465 * Return existing or newly allocated sta_info under RCU read lock.
466 * (re)initialize with given IEs.
467 */
468 static struct sta_info *
469 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
470 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
471 {
472 struct sta_info *sta = NULL;
473
474 rcu_read_lock();
475 sta = sta_info_get(sdata, addr);
476 if (sta) {
477 mesh_sta_info_init(sdata, sta, elems, false);
478 } else {
479 rcu_read_unlock();
480 /* can't run atomic */
481 sta = mesh_sta_info_alloc(sdata, addr, elems);
482 if (!sta) {
483 rcu_read_lock();
484 return NULL;
485 }
486
487 mesh_sta_info_init(sdata, sta, elems, true);
488
489 if (sta_info_insert_rcu(sta))
490 return NULL;
491 }
492
493 return sta;
494 }
495
496 /*
497 * mesh_neighbour_update - update or initialize new mesh neighbor.
498 *
499 * @sdata: local meshif
500 * @addr: peer's address
501 * @elems: IEs from beacon or mesh peering frame
502 *
503 * Initiates peering if appropriate.
504 */
505 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
506 u8 *hw_addr,
507 struct ieee802_11_elems *elems)
508 {
509 struct sta_info *sta;
510 u32 changed = 0;
511
512 sta = mesh_sta_info_get(sdata, hw_addr, elems);
513 if (!sta)
514 goto out;
515
516 if (mesh_peer_accepts_plinks(elems) &&
517 sta->plink_state == NL80211_PLINK_LISTEN &&
518 sdata->u.mesh.accepting_plinks &&
519 sdata->u.mesh.mshcfg.auto_open_plinks &&
520 rssi_threshold_check(sta, sdata))
521 changed = mesh_plink_open(sta);
522
523 ieee80211_mps_frame_release(sta, elems);
524 out:
525 rcu_read_unlock();
526 ieee80211_mbss_info_change_notify(sdata, changed);
527 }
528
529 static void mesh_plink_timer(unsigned long data)
530 {
531 struct sta_info *sta;
532 __le16 llid, plid, reason;
533 struct ieee80211_sub_if_data *sdata;
534 struct mesh_config *mshcfg;
535
536 /*
537 * This STA is valid because sta_info_destroy() will
538 * del_timer_sync() this timer after having made sure
539 * it cannot be readded (by deleting the plink.)
540 */
541 sta = (struct sta_info *) data;
542
543 if (sta->sdata->local->quiescing)
544 return;
545
546 spin_lock_bh(&sta->lock);
547 if (sta->ignore_plink_timer) {
548 sta->ignore_plink_timer = false;
549 spin_unlock_bh(&sta->lock);
550 return;
551 }
552 mpl_dbg(sta->sdata,
553 "Mesh plink timer for %pM fired on state %s\n",
554 sta->sta.addr, mplstates[sta->plink_state]);
555 reason = 0;
556 llid = sta->llid;
557 plid = sta->plid;
558 sdata = sta->sdata;
559 mshcfg = &sdata->u.mesh.mshcfg;
560
561 switch (sta->plink_state) {
562 case NL80211_PLINK_OPN_RCVD:
563 case NL80211_PLINK_OPN_SNT:
564 /* retry timer */
565 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
566 u32 rand;
567 mpl_dbg(sta->sdata,
568 "Mesh plink for %pM (retry, timeout): %d %d\n",
569 sta->sta.addr, sta->plink_retries,
570 sta->plink_timeout);
571 get_random_bytes(&rand, sizeof(u32));
572 sta->plink_timeout = sta->plink_timeout +
573 rand % sta->plink_timeout;
574 ++sta->plink_retries;
575 mod_plink_timer(sta, sta->plink_timeout);
576 spin_unlock_bh(&sta->lock);
577 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
578 sta->sta.addr, llid, 0, 0);
579 break;
580 }
581 reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES);
582 /* fall through on else */
583 case NL80211_PLINK_CNF_RCVD:
584 /* confirm timer */
585 if (!reason)
586 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT);
587 sta->plink_state = NL80211_PLINK_HOLDING;
588 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
589 spin_unlock_bh(&sta->lock);
590 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
591 sta->sta.addr, llid, plid, reason);
592 break;
593 case NL80211_PLINK_HOLDING:
594 /* holding timer */
595 del_timer(&sta->plink_timer);
596 mesh_plink_fsm_restart(sta);
597 spin_unlock_bh(&sta->lock);
598 break;
599 default:
600 spin_unlock_bh(&sta->lock);
601 break;
602 }
603 }
604
605 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
606 {
607 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
608 sta->plink_timer.data = (unsigned long) sta;
609 sta->plink_timer.function = mesh_plink_timer;
610 sta->plink_timeout = timeout;
611 add_timer(&sta->plink_timer);
612 }
613
614 u32 mesh_plink_open(struct sta_info *sta)
615 {
616 __le16 llid;
617 struct ieee80211_sub_if_data *sdata = sta->sdata;
618 u32 changed;
619
620 if (!test_sta_flag(sta, WLAN_STA_AUTH))
621 return 0;
622
623 spin_lock_bh(&sta->lock);
624 get_random_bytes(&llid, 2);
625 sta->llid = llid;
626 if (sta->plink_state != NL80211_PLINK_LISTEN &&
627 sta->plink_state != NL80211_PLINK_BLOCKED) {
628 spin_unlock_bh(&sta->lock);
629 return 0;
630 }
631 sta->plink_state = NL80211_PLINK_OPN_SNT;
632 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
633 spin_unlock_bh(&sta->lock);
634 mpl_dbg(sdata,
635 "Mesh plink: starting establishment with %pM\n",
636 sta->sta.addr);
637
638 /* set the non-peer mode to active during peering */
639 changed = ieee80211_mps_local_status_update(sdata);
640
641 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
642 sta->sta.addr, llid, 0, 0);
643 return changed;
644 }
645
646 u32 mesh_plink_block(struct sta_info *sta)
647 {
648 u32 changed;
649
650 spin_lock_bh(&sta->lock);
651 changed = __mesh_plink_deactivate(sta);
652 sta->plink_state = NL80211_PLINK_BLOCKED;
653 spin_unlock_bh(&sta->lock);
654
655 return changed;
656 }
657
658
659 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
660 struct ieee80211_mgmt *mgmt, size_t len,
661 struct ieee80211_rx_status *rx_status)
662 {
663 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
664 struct ieee802_11_elems elems;
665 struct sta_info *sta;
666 enum plink_event event;
667 enum ieee80211_self_protected_actioncode ftype;
668 size_t baselen;
669 bool matches_local = true;
670 u8 ie_len;
671 u8 *baseaddr;
672 u32 changed = 0;
673 __le16 plid, llid, reason;
674
675 /* need action_code, aux */
676 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
677 return;
678
679 if (sdata->u.mesh.user_mpm)
680 /* userspace must register for these */
681 return;
682
683 if (is_multicast_ether_addr(mgmt->da)) {
684 mpl_dbg(sdata,
685 "Mesh plink: ignore frame from multicast address\n");
686 return;
687 }
688
689 baseaddr = mgmt->u.action.u.self_prot.variable;
690 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
691 if (mgmt->u.action.u.self_prot.action_code ==
692 WLAN_SP_MESH_PEERING_CONFIRM) {
693 baseaddr += 4;
694 baselen += 4;
695 }
696 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
697
698 if (!elems.peering) {
699 mpl_dbg(sdata,
700 "Mesh plink: missing necessary peer link ie\n");
701 return;
702 }
703
704 if (elems.rsn_len &&
705 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
706 mpl_dbg(sdata,
707 "Mesh plink: can't establish link with secure peer\n");
708 return;
709 }
710
711 ftype = mgmt->u.action.u.self_prot.action_code;
712 ie_len = elems.peering_len;
713 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
714 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
715 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
716 && ie_len != 8)) {
717 mpl_dbg(sdata,
718 "Mesh plink: incorrect plink ie length %d %d\n",
719 ftype, ie_len);
720 return;
721 }
722
723 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
724 (!elems.mesh_id || !elems.mesh_config)) {
725 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
726 return;
727 }
728 /* Note the lines below are correct, the llid in the frame is the plid
729 * from the point of view of this host.
730 */
731 memcpy(&plid, PLINK_GET_LLID(elems.peering), 2);
732 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
733 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
734 memcpy(&llid, PLINK_GET_PLID(elems.peering), 2);
735
736 /* WARNING: Only for sta pointer, is dropped & re-acquired */
737 rcu_read_lock();
738
739 sta = sta_info_get(sdata, mgmt->sa);
740 if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) {
741 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
742 rcu_read_unlock();
743 return;
744 }
745
746 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
747 !rssi_threshold_check(sta, sdata)) {
748 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
749 mgmt->sa);
750 rcu_read_unlock();
751 return;
752 }
753
754 if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) {
755 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
756 rcu_read_unlock();
757 return;
758 }
759
760 if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) {
761 rcu_read_unlock();
762 return;
763 }
764
765 /* Now we will figure out the appropriate event... */
766 event = PLINK_UNDEFINED;
767 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
768 !mesh_matches_local(sdata, &elems)) {
769 matches_local = false;
770 switch (ftype) {
771 case WLAN_SP_MESH_PEERING_OPEN:
772 event = OPN_RJCT;
773 break;
774 case WLAN_SP_MESH_PEERING_CONFIRM:
775 event = CNF_RJCT;
776 break;
777 default:
778 break;
779 }
780 }
781
782 if (!sta && !matches_local) {
783 rcu_read_unlock();
784 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
785 llid = 0;
786 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
787 mgmt->sa, llid, plid, reason);
788 return;
789 } else if (!sta) {
790 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
791 if (!mesh_plink_free_count(sdata)) {
792 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
793 rcu_read_unlock();
794 return;
795 }
796 event = OPN_ACPT;
797 } else if (matches_local) {
798 switch (ftype) {
799 case WLAN_SP_MESH_PEERING_OPEN:
800 if (!mesh_plink_free_count(sdata) ||
801 (sta->plid && sta->plid != plid))
802 event = OPN_IGNR;
803 else
804 event = OPN_ACPT;
805 break;
806 case WLAN_SP_MESH_PEERING_CONFIRM:
807 if (!mesh_plink_free_count(sdata) ||
808 (sta->llid != llid || sta->plid != plid))
809 event = CNF_IGNR;
810 else
811 event = CNF_ACPT;
812 break;
813 case WLAN_SP_MESH_PEERING_CLOSE:
814 if (sta->plink_state == NL80211_PLINK_ESTAB)
815 /* Do not check for llid or plid. This does not
816 * follow the standard but since multiple plinks
817 * per sta are not supported, it is necessary in
818 * order to avoid a livelock when MP A sees an
819 * establish peer link to MP B but MP B does not
820 * see it. This can be caused by a timeout in
821 * B's peer link establishment or B beign
822 * restarted.
823 */
824 event = CLS_ACPT;
825 else if (sta->plid != plid)
826 event = CLS_IGNR;
827 else if (ie_len == 7 && sta->llid != llid)
828 event = CLS_IGNR;
829 else
830 event = CLS_ACPT;
831 break;
832 default:
833 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
834 rcu_read_unlock();
835 return;
836 }
837 }
838
839 if (event == OPN_ACPT) {
840 rcu_read_unlock();
841 /* allocate sta entry if necessary and update info */
842 sta = mesh_sta_info_get(sdata, mgmt->sa, &elems);
843 if (!sta) {
844 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
845 rcu_read_unlock();
846 return;
847 }
848 }
849
850 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", mgmt->sa,
851 mplstates[sta->plink_state], mplevents[event]);
852 reason = 0;
853 spin_lock_bh(&sta->lock);
854 switch (sta->plink_state) {
855 /* spin_unlock as soon as state is updated at each case */
856 case NL80211_PLINK_LISTEN:
857 switch (event) {
858 case CLS_ACPT:
859 mesh_plink_fsm_restart(sta);
860 spin_unlock_bh(&sta->lock);
861 break;
862 case OPN_ACPT:
863 sta->plink_state = NL80211_PLINK_OPN_RCVD;
864 sta->plid = plid;
865 get_random_bytes(&llid, 2);
866 sta->llid = llid;
867 mesh_plink_timer_set(sta,
868 mshcfg->dot11MeshRetryTimeout);
869
870 /* set the non-peer mode to active during peering */
871 changed |= ieee80211_mps_local_status_update(sdata);
872
873 spin_unlock_bh(&sta->lock);
874 mesh_plink_frame_tx(sdata,
875 WLAN_SP_MESH_PEERING_OPEN,
876 sta->sta.addr, llid, 0, 0);
877 mesh_plink_frame_tx(sdata,
878 WLAN_SP_MESH_PEERING_CONFIRM,
879 sta->sta.addr, llid, plid, 0);
880 break;
881 default:
882 spin_unlock_bh(&sta->lock);
883 break;
884 }
885 break;
886
887 case NL80211_PLINK_OPN_SNT:
888 switch (event) {
889 case OPN_RJCT:
890 case CNF_RJCT:
891 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
892 case CLS_ACPT:
893 if (!reason)
894 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
895 sta->reason = reason;
896 sta->plink_state = NL80211_PLINK_HOLDING;
897 if (!mod_plink_timer(sta,
898 mshcfg->dot11MeshHoldingTimeout))
899 sta->ignore_plink_timer = true;
900
901 llid = sta->llid;
902 spin_unlock_bh(&sta->lock);
903 mesh_plink_frame_tx(sdata,
904 WLAN_SP_MESH_PEERING_CLOSE,
905 sta->sta.addr, llid, plid, reason);
906 break;
907 case OPN_ACPT:
908 /* retry timer is left untouched */
909 sta->plink_state = NL80211_PLINK_OPN_RCVD;
910 sta->plid = plid;
911 llid = sta->llid;
912 spin_unlock_bh(&sta->lock);
913 mesh_plink_frame_tx(sdata,
914 WLAN_SP_MESH_PEERING_CONFIRM,
915 sta->sta.addr, llid, plid, 0);
916 break;
917 case CNF_ACPT:
918 sta->plink_state = NL80211_PLINK_CNF_RCVD;
919 if (!mod_plink_timer(sta,
920 mshcfg->dot11MeshConfirmTimeout))
921 sta->ignore_plink_timer = true;
922
923 spin_unlock_bh(&sta->lock);
924 break;
925 default:
926 spin_unlock_bh(&sta->lock);
927 break;
928 }
929 break;
930
931 case NL80211_PLINK_OPN_RCVD:
932 switch (event) {
933 case OPN_RJCT:
934 case CNF_RJCT:
935 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
936 case CLS_ACPT:
937 if (!reason)
938 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
939 sta->reason = reason;
940 sta->plink_state = NL80211_PLINK_HOLDING;
941 if (!mod_plink_timer(sta,
942 mshcfg->dot11MeshHoldingTimeout))
943 sta->ignore_plink_timer = true;
944
945 llid = sta->llid;
946 spin_unlock_bh(&sta->lock);
947 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
948 sta->sta.addr, llid, plid, reason);
949 break;
950 case OPN_ACPT:
951 llid = sta->llid;
952 spin_unlock_bh(&sta->lock);
953 mesh_plink_frame_tx(sdata,
954 WLAN_SP_MESH_PEERING_CONFIRM,
955 sta->sta.addr, llid, plid, 0);
956 break;
957 case CNF_ACPT:
958 del_timer(&sta->plink_timer);
959 sta->plink_state = NL80211_PLINK_ESTAB;
960 spin_unlock_bh(&sta->lock);
961 changed |= mesh_plink_inc_estab_count(sdata);
962 changed |= mesh_set_ht_prot_mode(sdata);
963 changed |= mesh_set_short_slot_time(sdata);
964 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n",
965 sta->sta.addr);
966 ieee80211_mps_sta_status_update(sta);
967 changed |= ieee80211_mps_set_sta_local_pm(sta,
968 mshcfg->power_mode);
969 break;
970 default:
971 spin_unlock_bh(&sta->lock);
972 break;
973 }
974 break;
975
976 case NL80211_PLINK_CNF_RCVD:
977 switch (event) {
978 case OPN_RJCT:
979 case CNF_RJCT:
980 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
981 case CLS_ACPT:
982 if (!reason)
983 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
984 sta->reason = reason;
985 sta->plink_state = NL80211_PLINK_HOLDING;
986 if (!mod_plink_timer(sta,
987 mshcfg->dot11MeshHoldingTimeout))
988 sta->ignore_plink_timer = true;
989
990 llid = sta->llid;
991 spin_unlock_bh(&sta->lock);
992 mesh_plink_frame_tx(sdata,
993 WLAN_SP_MESH_PEERING_CLOSE,
994 sta->sta.addr, llid, plid, reason);
995 break;
996 case OPN_ACPT:
997 del_timer(&sta->plink_timer);
998 sta->plink_state = NL80211_PLINK_ESTAB;
999 spin_unlock_bh(&sta->lock);
1000 changed |= mesh_plink_inc_estab_count(sdata);
1001 changed |= mesh_set_ht_prot_mode(sdata);
1002 changed |= mesh_set_short_slot_time(sdata);
1003 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n",
1004 sta->sta.addr);
1005 mesh_plink_frame_tx(sdata,
1006 WLAN_SP_MESH_PEERING_CONFIRM,
1007 sta->sta.addr, llid, plid, 0);
1008 ieee80211_mps_sta_status_update(sta);
1009 changed |= ieee80211_mps_set_sta_local_pm(sta,
1010 mshcfg->power_mode);
1011 break;
1012 default:
1013 spin_unlock_bh(&sta->lock);
1014 break;
1015 }
1016 break;
1017
1018 case NL80211_PLINK_ESTAB:
1019 switch (event) {
1020 case CLS_ACPT:
1021 reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
1022 sta->reason = reason;
1023 changed |= __mesh_plink_deactivate(sta);
1024 sta->plink_state = NL80211_PLINK_HOLDING;
1025 llid = sta->llid;
1026 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
1027 spin_unlock_bh(&sta->lock);
1028 changed |= mesh_set_ht_prot_mode(sdata);
1029 changed |= mesh_set_short_slot_time(sdata);
1030 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1031 sta->sta.addr, llid, plid, reason);
1032 break;
1033 case OPN_ACPT:
1034 llid = sta->llid;
1035 spin_unlock_bh(&sta->lock);
1036 mesh_plink_frame_tx(sdata,
1037 WLAN_SP_MESH_PEERING_CONFIRM,
1038 sta->sta.addr, llid, plid, 0);
1039 break;
1040 default:
1041 spin_unlock_bh(&sta->lock);
1042 break;
1043 }
1044 break;
1045 case NL80211_PLINK_HOLDING:
1046 switch (event) {
1047 case CLS_ACPT:
1048 if (del_timer(&sta->plink_timer))
1049 sta->ignore_plink_timer = 1;
1050 mesh_plink_fsm_restart(sta);
1051 spin_unlock_bh(&sta->lock);
1052 break;
1053 case OPN_ACPT:
1054 case CNF_ACPT:
1055 case OPN_RJCT:
1056 case CNF_RJCT:
1057 llid = sta->llid;
1058 reason = sta->reason;
1059 spin_unlock_bh(&sta->lock);
1060 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1061 sta->sta.addr, llid, plid, reason);
1062 break;
1063 default:
1064 spin_unlock_bh(&sta->lock);
1065 }
1066 break;
1067 default:
1068 /* should not get here, PLINK_BLOCKED is dealt with at the
1069 * beginning of the function
1070 */
1071 spin_unlock_bh(&sta->lock);
1072 break;
1073 }
1074
1075 rcu_read_unlock();
1076
1077 if (changed)
1078 ieee80211_mbss_info_change_notify(sdata, changed);
1079 }
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