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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
22enum plink_event {
23 PLINK_UNDEFINED,
24 OPN_ACPT,
25 OPN_RJCT,
26 OPN_IGNR,
27 CNF_ACPT,
28 CNF_RJCT,
29 CNF_IGNR,
30 CLS_ACPT,
31 CLS_IGNR
32};
33
34static const char * const mplstates[] = {
35 [NL80211_PLINK_LISTEN] = "LISTEN",
36 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
37 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
38 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
39 [NL80211_PLINK_ESTAB] = "ESTAB",
40 [NL80211_PLINK_HOLDING] = "HOLDING",
41 [NL80211_PLINK_BLOCKED] = "BLOCKED"
42};
43
44static const char * const mplevents[] = {
45 [PLINK_UNDEFINED] = "NONE",
46 [OPN_ACPT] = "OPN_ACPT",
47 [OPN_RJCT] = "OPN_RJCT",
48 [OPN_IGNR] = "OPN_IGNR",
49 [CNF_ACPT] = "CNF_ACPT",
50 [CNF_RJCT] = "CNF_RJCT",
51 [CNF_IGNR] = "CNF_IGNR",
52 [CLS_ACPT] = "CLS_ACPT",
53 [CLS_IGNR] = "CLS_IGNR"
54};
55
56static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
57 enum ieee80211_self_protected_actioncode action,
58 u8 *da, u16 llid, u16 plid, u16 reason);
59
60
61
62static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
63 struct sta_info *sta)
64{
65 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
66 return rssi_threshold == 0 ||
67 (sta && (s8) -ewma_read(&sta->avg_signal) > rssi_threshold);
68}
69
70
71
72
73
74
75
76
77static inline void mesh_plink_fsm_restart(struct sta_info *sta)
78{
79 sta->plink_state = NL80211_PLINK_LISTEN;
80 sta->llid = sta->plid = sta->reason = 0;
81 sta->plink_retries = 0;
82}
83
84
85
86
87
88
89
90
91
92
93
94static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
95{
96 struct ieee80211_local *local = sdata->local;
97 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
98 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
99 struct sta_info *sta;
100 u32 erp_rates = 0, changed = 0;
101 int i;
102 bool short_slot = false;
103
104 if (band == IEEE80211_BAND_5GHZ) {
105
106 short_slot = true;
107 goto out;
108 } else if (band != IEEE80211_BAND_2GHZ ||
109 (band == IEEE80211_BAND_2GHZ &&
110 local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
111 goto out;
112
113 for (i = 0; i < sband->n_bitrates; i++)
114 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
115 erp_rates |= BIT(i);
116
117 if (!erp_rates)
118 goto out;
119
120 rcu_read_lock();
121 list_for_each_entry_rcu(sta, &local->sta_list, list) {
122 if (sdata != sta->sdata ||
123 sta->plink_state != NL80211_PLINK_ESTAB)
124 continue;
125
126 short_slot = false;
127 if (erp_rates & sta->sta.supp_rates[band])
128 short_slot = true;
129 else
130 break;
131 }
132 rcu_read_unlock();
133
134out:
135 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
136 sdata->vif.bss_conf.use_short_slot = short_slot;
137 changed = BSS_CHANGED_ERP_SLOT;
138 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
139 sdata->vif.addr, short_slot);
140 }
141 return changed;
142}
143
144
145
146
147
148
149
150
151
152
153
154static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
155{
156 struct ieee80211_local *local = sdata->local;
157 struct sta_info *sta;
158 u16 ht_opmode;
159 bool non_ht_sta = false, ht20_sta = false;
160
161 switch (sdata->vif.bss_conf.chandef.width) {
162 case NL80211_CHAN_WIDTH_20_NOHT:
163 case NL80211_CHAN_WIDTH_5:
164 case NL80211_CHAN_WIDTH_10:
165 return 0;
166 default:
167 break;
168 }
169
170 rcu_read_lock();
171 list_for_each_entry_rcu(sta, &local->sta_list, list) {
172 if (sdata != sta->sdata ||
173 sta->plink_state != NL80211_PLINK_ESTAB)
174 continue;
175
176 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
177 continue;
178
179 if (!sta->sta.ht_cap.ht_supported) {
180 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
181 sta->sta.addr);
182 non_ht_sta = true;
183 break;
184 }
185
186 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
187 ht20_sta = true;
188 }
189 rcu_read_unlock();
190
191 if (non_ht_sta)
192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
193 else if (ht20_sta &&
194 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
195 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
196 else
197 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
198
199 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
200 return 0;
201
202 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
203 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
204 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
205 return BSS_CHANGED_HT;
206}
207
208
209
210
211
212
213
214
215
216
217
218static u32 __mesh_plink_deactivate(struct sta_info *sta)
219{
220 struct ieee80211_sub_if_data *sdata = sta->sdata;
221 u32 changed = 0;
222
223 if (sta->plink_state == NL80211_PLINK_ESTAB)
224 changed = mesh_plink_dec_estab_count(sdata);
225 sta->plink_state = NL80211_PLINK_BLOCKED;
226 mesh_path_flush_by_nexthop(sta);
227
228 ieee80211_mps_sta_status_update(sta);
229 changed |= ieee80211_mps_set_sta_local_pm(sta,
230 NL80211_MESH_POWER_UNKNOWN);
231
232 return changed;
233}
234
235
236
237
238
239
240
241
242u32 mesh_plink_deactivate(struct sta_info *sta)
243{
244 struct ieee80211_sub_if_data *sdata = sta->sdata;
245 u32 changed;
246
247 spin_lock_bh(&sta->lock);
248 changed = __mesh_plink_deactivate(sta);
249 sta->reason = WLAN_REASON_MESH_PEER_CANCELED;
250 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
251 sta->sta.addr, sta->llid, sta->plid,
252 sta->reason);
253 spin_unlock_bh(&sta->lock);
254
255 return changed;
256}
257
258static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
259 enum ieee80211_self_protected_actioncode action,
260 u8 *da, u16 llid, u16 plid, u16 reason)
261{
262 struct ieee80211_local *local = sdata->local;
263 struct sk_buff *skb;
264 struct ieee80211_tx_info *info;
265 struct ieee80211_mgmt *mgmt;
266 bool include_plid = false;
267 u16 peering_proto = 0;
268 u8 *pos, ie_len = 4;
269 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
270 sizeof(mgmt->u.action.u.self_prot);
271 int err = -ENOMEM;
272
273 skb = dev_alloc_skb(local->tx_headroom +
274 hdr_len +
275 2 +
276 2 +
277 2 + 8 +
278 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
279 2 + sdata->u.mesh.mesh_id_len +
280 2 + sizeof(struct ieee80211_meshconf_ie) +
281 2 + sizeof(struct ieee80211_ht_cap) +
282 2 + sizeof(struct ieee80211_ht_operation) +
283 2 + 8 +
284 sdata->u.mesh.ie_len);
285 if (!skb)
286 return err;
287 info = IEEE80211_SKB_CB(skb);
288 skb_reserve(skb, local->tx_headroom);
289 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
290 memset(mgmt, 0, hdr_len);
291 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
292 IEEE80211_STYPE_ACTION);
293 memcpy(mgmt->da, da, ETH_ALEN);
294 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
295 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
296 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
297 mgmt->u.action.u.self_prot.action_code = action;
298
299 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
300 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
301
302
303 pos = skb_put(skb, 2);
304 memset(pos, 0, 2);
305 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
306
307 pos = skb_put(skb, 2);
308 put_unaligned_le16(plid, pos + 2);
309 }
310 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
311 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
312 mesh_add_rsn_ie(sdata, skb) ||
313 mesh_add_meshid_ie(sdata, skb) ||
314 mesh_add_meshconf_ie(sdata, skb))
315 goto free;
316 } else {
317 info->flags |= IEEE80211_TX_CTL_NO_ACK;
318 if (mesh_add_meshid_ie(sdata, skb))
319 goto free;
320 }
321
322
323 switch (action) {
324 case WLAN_SP_MESH_PEERING_OPEN:
325 break;
326 case WLAN_SP_MESH_PEERING_CONFIRM:
327 ie_len += 2;
328 include_plid = true;
329 break;
330 case WLAN_SP_MESH_PEERING_CLOSE:
331 if (plid) {
332 ie_len += 2;
333 include_plid = true;
334 }
335 ie_len += 2;
336 break;
337 default:
338 err = -EINVAL;
339 goto free;
340 }
341
342 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
343 goto free;
344
345 pos = skb_put(skb, 2 + ie_len);
346 *pos++ = WLAN_EID_PEER_MGMT;
347 *pos++ = ie_len;
348 memcpy(pos, &peering_proto, 2);
349 pos += 2;
350 put_unaligned_le16(llid, pos);
351 pos += 2;
352 if (include_plid) {
353 put_unaligned_le16(plid, pos);
354 pos += 2;
355 }
356 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
357 put_unaligned_le16(reason, pos);
358 pos += 2;
359 }
360
361 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
362 if (mesh_add_ht_cap_ie(sdata, skb) ||
363 mesh_add_ht_oper_ie(sdata, skb))
364 goto free;
365 }
366
367 if (mesh_add_vendor_ies(sdata, skb))
368 goto free;
369
370 ieee80211_tx_skb(sdata, skb);
371 return 0;
372free:
373 kfree_skb(skb);
374 return err;
375}
376
377static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
378 struct sta_info *sta,
379 struct ieee802_11_elems *elems, bool insert)
380{
381 struct ieee80211_local *local = sdata->local;
382 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
383 struct ieee80211_supported_band *sband;
384 u32 rates, basic_rates = 0, changed = 0;
385
386 sband = local->hw.wiphy->bands[band];
387 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
388
389 spin_lock_bh(&sta->lock);
390 sta->last_rx = jiffies;
391
392
393 if (sta->plink_state == NL80211_PLINK_ESTAB)
394 goto out;
395
396 if (sta->sta.supp_rates[band] != rates)
397 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
398 sta->sta.supp_rates[band] = rates;
399
400 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
401 elems->ht_cap_elem, sta))
402 changed |= IEEE80211_RC_BW_CHANGED;
403
404
405 if (elems->ht_operation &&
406 !(elems->ht_operation->ht_param &
407 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
408 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
409 changed |= IEEE80211_RC_BW_CHANGED;
410 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
411 }
412
413 if (insert)
414 rate_control_rate_init(sta);
415 else
416 rate_control_rate_update(local, sband, sta, changed);
417out:
418 spin_unlock_bh(&sta->lock);
419}
420
421static struct sta_info *
422__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
423{
424 struct sta_info *sta;
425
426 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
427 return NULL;
428
429 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
430 if (!sta)
431 return NULL;
432
433 sta->plink_state = NL80211_PLINK_LISTEN;
434
435 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
436 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
437 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
438
439 set_sta_flag(sta, WLAN_STA_WME);
440 sta->sta.wme = true;
441
442 return sta;
443}
444
445static struct sta_info *
446mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
447 struct ieee802_11_elems *elems)
448{
449 struct sta_info *sta = NULL;
450
451
452 if (sdata->u.mesh.user_mpm ||
453 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
454 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
455 elems->ie_start,
456 elems->total_len,
457 GFP_KERNEL);
458 else
459 sta = __mesh_sta_info_alloc(sdata, addr);
460
461 return sta;
462}
463
464
465
466
467
468
469
470
471
472
473
474static struct sta_info *
475mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
476 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
477{
478 struct sta_info *sta = NULL;
479
480 rcu_read_lock();
481 sta = sta_info_get(sdata, addr);
482 if (sta) {
483 mesh_sta_info_init(sdata, sta, elems, false);
484 } else {
485 rcu_read_unlock();
486
487 sta = mesh_sta_info_alloc(sdata, addr, elems);
488 if (!sta) {
489 rcu_read_lock();
490 return NULL;
491 }
492
493 mesh_sta_info_init(sdata, sta, elems, true);
494
495 if (sta_info_insert_rcu(sta))
496 return NULL;
497 }
498
499 return sta;
500}
501
502
503
504
505
506
507
508
509
510
511void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
512 u8 *hw_addr,
513 struct ieee802_11_elems *elems)
514{
515 struct sta_info *sta;
516 u32 changed = 0;
517
518 sta = mesh_sta_info_get(sdata, hw_addr, elems);
519 if (!sta)
520 goto out;
521
522 if (mesh_peer_accepts_plinks(elems) &&
523 sta->plink_state == NL80211_PLINK_LISTEN &&
524 sdata->u.mesh.accepting_plinks &&
525 sdata->u.mesh.mshcfg.auto_open_plinks &&
526 rssi_threshold_check(sdata, sta))
527 changed = mesh_plink_open(sta);
528
529 ieee80211_mps_frame_release(sta, elems);
530out:
531 rcu_read_unlock();
532 ieee80211_mbss_info_change_notify(sdata, changed);
533}
534
535static void mesh_plink_timer(unsigned long data)
536{
537 struct sta_info *sta;
538 u16 reason = 0;
539 struct ieee80211_sub_if_data *sdata;
540 struct mesh_config *mshcfg;
541 enum ieee80211_self_protected_actioncode action = 0;
542
543
544
545
546
547
548 sta = (struct sta_info *) data;
549
550 if (sta->sdata->local->quiescing)
551 return;
552
553 spin_lock_bh(&sta->lock);
554 if (sta->ignore_plink_timer) {
555 sta->ignore_plink_timer = false;
556 spin_unlock_bh(&sta->lock);
557 return;
558 }
559 mpl_dbg(sta->sdata,
560 "Mesh plink timer for %pM fired on state %s\n",
561 sta->sta.addr, mplstates[sta->plink_state]);
562 sdata = sta->sdata;
563 mshcfg = &sdata->u.mesh.mshcfg;
564
565 switch (sta->plink_state) {
566 case NL80211_PLINK_OPN_RCVD:
567 case NL80211_PLINK_OPN_SNT:
568
569 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
570 u32 rand;
571 mpl_dbg(sta->sdata,
572 "Mesh plink for %pM (retry, timeout): %d %d\n",
573 sta->sta.addr, sta->plink_retries,
574 sta->plink_timeout);
575 get_random_bytes(&rand, sizeof(u32));
576 sta->plink_timeout = sta->plink_timeout +
577 rand % sta->plink_timeout;
578 ++sta->plink_retries;
579 mod_plink_timer(sta, sta->plink_timeout);
580 action = WLAN_SP_MESH_PEERING_OPEN;
581 break;
582 }
583 reason = WLAN_REASON_MESH_MAX_RETRIES;
584
585 case NL80211_PLINK_CNF_RCVD:
586
587 if (!reason)
588 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
589 sta->plink_state = NL80211_PLINK_HOLDING;
590 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
591 action = WLAN_SP_MESH_PEERING_CLOSE;
592 break;
593 case NL80211_PLINK_HOLDING:
594
595 del_timer(&sta->plink_timer);
596 mesh_plink_fsm_restart(sta);
597 break;
598 default:
599 break;
600 }
601 spin_unlock_bh(&sta->lock);
602 if (action)
603 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
604 sta->llid, sta->plid, reason);
605}
606
607static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
608{
609 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
610 sta->plink_timer.data = (unsigned long) sta;
611 sta->plink_timer.function = mesh_plink_timer;
612 sta->plink_timeout = timeout;
613 add_timer(&sta->plink_timer);
614}
615
616static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
617 u16 llid)
618{
619 struct ieee80211_local *local = sdata->local;
620 bool in_use = false;
621 struct sta_info *sta;
622
623 rcu_read_lock();
624 list_for_each_entry_rcu(sta, &local->sta_list, list) {
625 if (!memcmp(&sta->llid, &llid, sizeof(llid))) {
626 in_use = true;
627 break;
628 }
629 }
630 rcu_read_unlock();
631
632 return in_use;
633}
634
635static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
636{
637 u16 llid;
638
639 do {
640 get_random_bytes(&llid, sizeof(llid));
641
642 llid = (llid % IEEE80211_MAX_AID) + 1;
643 } while (llid_in_use(sdata, llid));
644
645 return llid;
646}
647
648u32 mesh_plink_open(struct sta_info *sta)
649{
650 struct ieee80211_sub_if_data *sdata = sta->sdata;
651 u32 changed;
652
653 if (!test_sta_flag(sta, WLAN_STA_AUTH))
654 return 0;
655
656 spin_lock_bh(&sta->lock);
657 sta->llid = mesh_get_new_llid(sdata);
658 if (sta->plink_state != NL80211_PLINK_LISTEN &&
659 sta->plink_state != NL80211_PLINK_BLOCKED) {
660 spin_unlock_bh(&sta->lock);
661 return 0;
662 }
663 sta->plink_state = NL80211_PLINK_OPN_SNT;
664 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
665 spin_unlock_bh(&sta->lock);
666 mpl_dbg(sdata,
667 "Mesh plink: starting establishment with %pM\n",
668 sta->sta.addr);
669
670
671 changed = ieee80211_mps_local_status_update(sdata);
672
673 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
674 sta->sta.addr, sta->llid, 0, 0);
675 return changed;
676}
677
678u32 mesh_plink_block(struct sta_info *sta)
679{
680 u32 changed;
681
682 spin_lock_bh(&sta->lock);
683 changed = __mesh_plink_deactivate(sta);
684 sta->plink_state = NL80211_PLINK_BLOCKED;
685 spin_unlock_bh(&sta->lock);
686
687 return changed;
688}
689
690static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
691 struct sta_info *sta,
692 enum plink_event event)
693{
694 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
695
696 u16 reason = (event == CLS_ACPT) ?
697 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
698
699 sta->reason = reason;
700 sta->plink_state = NL80211_PLINK_HOLDING;
701 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
702}
703
704static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
705 struct sta_info *sta)
706{
707 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
708 u32 changed = 0;
709
710 del_timer(&sta->plink_timer);
711 sta->plink_state = NL80211_PLINK_ESTAB;
712 changed |= mesh_plink_inc_estab_count(sdata);
713 changed |= mesh_set_ht_prot_mode(sdata);
714 changed |= mesh_set_short_slot_time(sdata);
715 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
716 ieee80211_mps_sta_status_update(sta);
717 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
718 return changed;
719}
720
721
722
723
724
725
726
727
728
729
730static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
731 struct sta_info *sta, enum plink_event event)
732{
733 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
734 enum ieee80211_self_protected_actioncode action = 0;
735 u32 changed = 0;
736
737 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
738 mplstates[sta->plink_state], mplevents[event]);
739
740 spin_lock_bh(&sta->lock);
741 switch (sta->plink_state) {
742 case NL80211_PLINK_LISTEN:
743 switch (event) {
744 case CLS_ACPT:
745 mesh_plink_fsm_restart(sta);
746 break;
747 case OPN_ACPT:
748 sta->plink_state = NL80211_PLINK_OPN_RCVD;
749 sta->llid = mesh_get_new_llid(sdata);
750 mesh_plink_timer_set(sta,
751 mshcfg->dot11MeshRetryTimeout);
752
753
754 changed |= ieee80211_mps_local_status_update(sdata);
755 action = WLAN_SP_MESH_PEERING_OPEN;
756 break;
757 default:
758 break;
759 }
760 break;
761 case NL80211_PLINK_OPN_SNT:
762 switch (event) {
763 case OPN_RJCT:
764 case CNF_RJCT:
765 case CLS_ACPT:
766 mesh_plink_close(sdata, sta, event);
767 action = WLAN_SP_MESH_PEERING_CLOSE;
768 break;
769 case OPN_ACPT:
770
771 sta->plink_state = NL80211_PLINK_OPN_RCVD;
772 action = WLAN_SP_MESH_PEERING_CONFIRM;
773 break;
774 case CNF_ACPT:
775 sta->plink_state = NL80211_PLINK_CNF_RCVD;
776 if (!mod_plink_timer(sta,
777 mshcfg->dot11MeshConfirmTimeout))
778 sta->ignore_plink_timer = true;
779 break;
780 default:
781 break;
782 }
783 break;
784 case NL80211_PLINK_OPN_RCVD:
785 switch (event) {
786 case OPN_RJCT:
787 case CNF_RJCT:
788 case CLS_ACPT:
789 mesh_plink_close(sdata, sta, event);
790 action = WLAN_SP_MESH_PEERING_CLOSE;
791 break;
792 case OPN_ACPT:
793 action = WLAN_SP_MESH_PEERING_CONFIRM;
794 break;
795 case CNF_ACPT:
796 changed |= mesh_plink_establish(sdata, sta);
797 break;
798 default:
799 break;
800 }
801 break;
802 case NL80211_PLINK_CNF_RCVD:
803 switch (event) {
804 case OPN_RJCT:
805 case CNF_RJCT:
806 case CLS_ACPT:
807 mesh_plink_close(sdata, sta, event);
808 action = WLAN_SP_MESH_PEERING_CLOSE;
809 break;
810 case OPN_ACPT:
811 changed |= mesh_plink_establish(sdata, sta);
812 action = WLAN_SP_MESH_PEERING_CONFIRM;
813 break;
814 default:
815 break;
816 }
817 break;
818 case NL80211_PLINK_ESTAB:
819 switch (event) {
820 case CLS_ACPT:
821 changed |= __mesh_plink_deactivate(sta);
822 changed |= mesh_set_ht_prot_mode(sdata);
823 changed |= mesh_set_short_slot_time(sdata);
824 mesh_plink_close(sdata, sta, event);
825 action = WLAN_SP_MESH_PEERING_CLOSE;
826 break;
827 case OPN_ACPT:
828 action = WLAN_SP_MESH_PEERING_CONFIRM;
829 break;
830 default:
831 break;
832 }
833 break;
834 case NL80211_PLINK_HOLDING:
835 switch (event) {
836 case CLS_ACPT:
837 if (del_timer(&sta->plink_timer))
838 sta->ignore_plink_timer = 1;
839 mesh_plink_fsm_restart(sta);
840 break;
841 case OPN_ACPT:
842 case CNF_ACPT:
843 case OPN_RJCT:
844 case CNF_RJCT:
845 action = WLAN_SP_MESH_PEERING_CLOSE;
846 break;
847 default:
848 break;
849 }
850 break;
851 default:
852
853
854
855 break;
856 }
857 spin_unlock_bh(&sta->lock);
858 if (action) {
859 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
860 sta->llid, sta->plid, sta->reason);
861
862
863 if (action == WLAN_SP_MESH_PEERING_OPEN) {
864 mesh_plink_frame_tx(sdata,
865 WLAN_SP_MESH_PEERING_CONFIRM,
866 sta->sta.addr, sta->llid,
867 sta->plid, 0);
868 }
869 }
870
871 return changed;
872}
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887static enum plink_event
888mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
889 struct sta_info *sta,
890 struct ieee802_11_elems *elems,
891 enum ieee80211_self_protected_actioncode ftype,
892 u16 llid, u16 plid)
893{
894 enum plink_event event = PLINK_UNDEFINED;
895 u8 ie_len = elems->peering_len;
896 bool matches_local;
897
898 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
899 mesh_matches_local(sdata, elems));
900
901
902 if (!matches_local && !sta) {
903 event = OPN_RJCT;
904 goto out;
905 }
906
907 if (!sta) {
908 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
909 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
910 goto out;
911 }
912
913 if (!mesh_plink_free_count(sdata)) {
914 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
915 goto out;
916 }
917 } else {
918 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
919 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
920 goto out;
921 }
922 if (sta->plink_state == NL80211_PLINK_BLOCKED)
923 goto out;
924 }
925
926
927 if (!sta) {
928 event = OPN_ACPT;
929 goto out;
930 }
931
932 switch (ftype) {
933 case WLAN_SP_MESH_PEERING_OPEN:
934 if (!matches_local)
935 event = OPN_RJCT;
936 if (!mesh_plink_free_count(sdata) ||
937 (sta->plid && sta->plid != plid))
938 event = OPN_IGNR;
939 else
940 event = OPN_ACPT;
941 break;
942 case WLAN_SP_MESH_PEERING_CONFIRM:
943 if (!matches_local)
944 event = CNF_RJCT;
945 if (!mesh_plink_free_count(sdata) ||
946 (sta->llid != llid || sta->plid != plid))
947 event = CNF_IGNR;
948 else
949 event = CNF_ACPT;
950 break;
951 case WLAN_SP_MESH_PEERING_CLOSE:
952 if (sta->plink_state == NL80211_PLINK_ESTAB)
953
954
955
956
957
958
959
960
961
962 event = CLS_ACPT;
963 else if (sta->plid != plid)
964 event = CLS_IGNR;
965 else if (ie_len == 8 && sta->llid != llid)
966 event = CLS_IGNR;
967 else
968 event = CLS_ACPT;
969 break;
970 default:
971 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
972 break;
973 }
974
975out:
976 return event;
977}
978
979static void
980mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
981 struct ieee80211_mgmt *mgmt,
982 struct ieee802_11_elems *elems)
983{
984
985 struct sta_info *sta;
986 enum plink_event event;
987 enum ieee80211_self_protected_actioncode ftype;
988 u32 changed = 0;
989 u8 ie_len = elems->peering_len;
990 __le16 _plid, _llid;
991 u16 plid, llid = 0;
992
993 if (!elems->peering) {
994 mpl_dbg(sdata,
995 "Mesh plink: missing necessary peer link ie\n");
996 return;
997 }
998
999 if (elems->rsn_len &&
1000 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1001 mpl_dbg(sdata,
1002 "Mesh plink: can't establish link with secure peer\n");
1003 return;
1004 }
1005
1006 ftype = mgmt->u.action.u.self_prot.action_code;
1007 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1008 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1009 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1010 && ie_len != 8)) {
1011 mpl_dbg(sdata,
1012 "Mesh plink: incorrect plink ie length %d %d\n",
1013 ftype, ie_len);
1014 return;
1015 }
1016
1017 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1018 (!elems->mesh_id || !elems->mesh_config)) {
1019 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1020 return;
1021 }
1022
1023
1024
1025 memcpy(&_plid, PLINK_GET_LLID(elems->peering), sizeof(__le16));
1026 plid = le16_to_cpu(_plid);
1027 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1028 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) {
1029 memcpy(&_llid, PLINK_GET_PLID(elems->peering), sizeof(__le16));
1030 llid = le16_to_cpu(_llid);
1031 }
1032
1033
1034 rcu_read_lock();
1035
1036 sta = sta_info_get(sdata, mgmt->sa);
1037
1038 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1039 !rssi_threshold_check(sdata, sta)) {
1040 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1041 mgmt->sa);
1042 goto unlock_rcu;
1043 }
1044
1045
1046 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1047
1048 if (event == OPN_ACPT) {
1049 rcu_read_unlock();
1050
1051 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
1052 if (!sta) {
1053 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1054 goto unlock_rcu;
1055 }
1056 sta->plid = plid;
1057 } else if (!sta && event == OPN_RJCT) {
1058 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1059 mgmt->sa, 0, plid,
1060 WLAN_REASON_MESH_CONFIG);
1061 goto unlock_rcu;
1062 } else if (!sta || event == PLINK_UNDEFINED) {
1063
1064 goto unlock_rcu;
1065 }
1066
1067 changed |= mesh_plink_fsm(sdata, sta, event);
1068
1069unlock_rcu:
1070 rcu_read_unlock();
1071
1072 if (changed)
1073 ieee80211_mbss_info_change_notify(sdata, changed);
1074}
1075
1076void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1077 struct ieee80211_mgmt *mgmt, size_t len,
1078 struct ieee80211_rx_status *rx_status)
1079{
1080 struct ieee802_11_elems elems;
1081 size_t baselen;
1082 u8 *baseaddr;
1083
1084
1085 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1086 return;
1087
1088 if (sdata->u.mesh.user_mpm)
1089
1090 return;
1091
1092 if (is_multicast_ether_addr(mgmt->da)) {
1093 mpl_dbg(sdata,
1094 "Mesh plink: ignore frame from multicast address\n");
1095 return;
1096 }
1097
1098 baseaddr = mgmt->u.action.u.self_prot.variable;
1099 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1100 if (mgmt->u.action.u.self_prot.action_code ==
1101 WLAN_SP_MESH_PEERING_CONFIRM) {
1102 baseaddr += 4;
1103 baselen += 4;
1104 }
1105 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1106 mesh_process_plink_frame(sdata, mgmt, &elems);
1107}
1108
