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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2019 Intel Corporation
5 * Author: Luis Carlos Cobo <luisca@cozybit.com>
6 */
7#include <linux/gfp.h>
8#include <linux/kernel.h>
9#include <linux/random.h>
10#include <linux/rculist.h>
11
12#include "ieee80211_i.h"
13#include "rate.h"
14#include "mesh.h"
15
16#define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
17#define PLINK_GET_LLID(p) (p + 2)
18#define PLINK_GET_PLID(p) (p + 4)
19
20#define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
21 jiffies + msecs_to_jiffies(t)))
22
23enum plink_event {
24 PLINK_UNDEFINED,
25 OPN_ACPT,
26 OPN_RJCT,
27 OPN_IGNR,
28 CNF_ACPT,
29 CNF_RJCT,
30 CNF_IGNR,
31 CLS_ACPT,
32 CLS_IGNR
33};
34
35static const char * const mplstates[] = {
36 [NL80211_PLINK_LISTEN] = "LISTEN",
37 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
38 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
39 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
40 [NL80211_PLINK_ESTAB] = "ESTAB",
41 [NL80211_PLINK_HOLDING] = "HOLDING",
42 [NL80211_PLINK_BLOCKED] = "BLOCKED"
43};
44
45static const char * const mplevents[] = {
46 [PLINK_UNDEFINED] = "NONE",
47 [OPN_ACPT] = "OPN_ACPT",
48 [OPN_RJCT] = "OPN_RJCT",
49 [OPN_IGNR] = "OPN_IGNR",
50 [CNF_ACPT] = "CNF_ACPT",
51 [CNF_RJCT] = "CNF_RJCT",
52 [CNF_IGNR] = "CNF_IGNR",
53 [CLS_ACPT] = "CLS_ACPT",
54 [CLS_IGNR] = "CLS_IGNR"
55};
56
57/* We only need a valid sta if user configured a minimum rssi_threshold. */
58static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
59 struct sta_info *sta)
60{
61 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
62 return rssi_threshold == 0 ||
63 (sta &&
64 (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) >
65 rssi_threshold);
66}
67
68/**
69 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
70 *
71 * @sta: mesh peer link to restart
72 *
73 * Locking: this function must be called holding sta->mesh->plink_lock
74 */
75static inline void mesh_plink_fsm_restart(struct sta_info *sta)
76{
77 lockdep_assert_held(&sta->mesh->plink_lock);
78 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
79 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
80 sta->mesh->plink_retries = 0;
81}
82
83/*
84 * mesh_set_short_slot_time - enable / disable ERP short slot time.
85 *
86 * The standard indirectly mandates mesh STAs to turn off short slot time by
87 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
88 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
89 * MBSS support ERP rates.
90 *
91 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
92 */
93static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
94{
95 struct ieee80211_local *local = sdata->local;
96 struct ieee80211_supported_band *sband;
97 struct sta_info *sta;
98 u32 erp_rates = 0, changed = 0;
99 int i;
100 bool short_slot = false;
101
102 sband = ieee80211_get_sband(sdata);
103 if (!sband)
104 return changed;
105
106 if (sband->band == NL80211_BAND_5GHZ) {
107 /* (IEEE 802.11-2012 19.4.5) */
108 short_slot = true;
109 goto out;
110 } else if (sband->band != NL80211_BAND_2GHZ) {
111 goto out;
112 }
113
114 for (i = 0; i < sband->n_bitrates; i++)
115 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
116 erp_rates |= BIT(i);
117
118 if (!erp_rates)
119 goto out;
120
121 rcu_read_lock();
122 list_for_each_entry_rcu(sta, &local->sta_list, list) {
123 if (sdata != sta->sdata ||
124 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
125 continue;
126
127 short_slot = false;
128 if (erp_rates & sta->sta.supp_rates[sband->band])
129 short_slot = true;
130 else
131 break;
132 }
133 rcu_read_unlock();
134
135out:
136 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
137 sdata->vif.bss_conf.use_short_slot = short_slot;
138 changed = BSS_CHANGED_ERP_SLOT;
139 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
140 sdata->vif.addr, short_slot);
141 }
142 return changed;
143}
144
145/**
146 * mesh_set_ht_prot_mode - set correct HT protection mode
147 *
148 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
149 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
150 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
151 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
152 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
153 * HT20 peer is present. Otherwise no-protection mode is selected.
154 */
155static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
156{
157 struct ieee80211_local *local = sdata->local;
158 struct sta_info *sta;
159 u16 ht_opmode;
160 bool non_ht_sta = false, ht20_sta = false;
161
162 switch (sdata->vif.bss_conf.chandef.width) {
163 case NL80211_CHAN_WIDTH_20_NOHT:
164 case NL80211_CHAN_WIDTH_5:
165 case NL80211_CHAN_WIDTH_10:
166 return 0;
167 default:
168 break;
169 }
170
171 rcu_read_lock();
172 list_for_each_entry_rcu(sta, &local->sta_list, list) {
173 if (sdata != sta->sdata ||
174 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
175 continue;
176
177 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
178 continue;
179
180 if (!sta->sta.ht_cap.ht_supported) {
181 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
182 sta->sta.addr);
183 non_ht_sta = true;
184 break;
185 }
186
187 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
188 ht20_sta = true;
189 }
190 rcu_read_unlock();
191
192 if (non_ht_sta)
193 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
194 else if (ht20_sta &&
195 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
196 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
197 else
198 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
199
200 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
201 return 0;
202
203 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
204 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
205 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
206 return BSS_CHANGED_HT;
207}
208
209static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
210 struct sta_info *sta,
211 enum ieee80211_self_protected_actioncode action,
212 u8 *da, u16 llid, u16 plid, u16 reason)
213{
214 struct ieee80211_local *local = sdata->local;
215 struct sk_buff *skb;
216 struct ieee80211_tx_info *info;
217 struct ieee80211_mgmt *mgmt;
218 bool include_plid = false;
219 u16 peering_proto = 0;
220 u8 *pos, ie_len = 4;
221 u8 ie_len_he_cap;
222 int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
223 int err = -ENOMEM;
224
225 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
226 NL80211_IFTYPE_MESH_POINT);
227 skb = dev_alloc_skb(local->tx_headroom +
228 hdr_len +
229 2 + /* capability info */
230 2 + /* AID */
231 2 + 8 + /* supported rates */
232 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
233 2 + sdata->u.mesh.mesh_id_len +
234 2 + sizeof(struct ieee80211_meshconf_ie) +
235 2 + sizeof(struct ieee80211_ht_cap) +
236 2 + sizeof(struct ieee80211_ht_operation) +
237 2 + sizeof(struct ieee80211_vht_cap) +
238 2 + sizeof(struct ieee80211_vht_operation) +
239 ie_len_he_cap +
240 2 + 1 + sizeof(struct ieee80211_he_operation) +
241 sizeof(struct ieee80211_he_6ghz_oper) +
242 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
243 2 + 8 + /* peering IE */
244 sdata->u.mesh.ie_len);
245 if (!skb)
246 return err;
247 info = IEEE80211_SKB_CB(skb);
248 skb_reserve(skb, local->tx_headroom);
249 mgmt = skb_put_zero(skb, hdr_len);
250 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
251 IEEE80211_STYPE_ACTION);
252 memcpy(mgmt->da, da, ETH_ALEN);
253 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
254 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
255 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
256 mgmt->u.action.u.self_prot.action_code = action;
257
258 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
259 struct ieee80211_supported_band *sband;
260 enum nl80211_band band;
261
262 sband = ieee80211_get_sband(sdata);
263 if (!sband) {
264 err = -EINVAL;
265 goto free;
266 }
267 band = sband->band;
268
269 /* capability info */
270 pos = skb_put_zero(skb, 2);
271 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
272 /* AID */
273 pos = skb_put(skb, 2);
274 put_unaligned_le16(sta->sta.aid, pos);
275 }
276 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
277 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
278 mesh_add_rsn_ie(sdata, skb) ||
279 mesh_add_meshid_ie(sdata, skb) ||
280 mesh_add_meshconf_ie(sdata, skb))
281 goto free;
282 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
283 info->flags |= IEEE80211_TX_CTL_NO_ACK;
284 if (mesh_add_meshid_ie(sdata, skb))
285 goto free;
286 }
287
288 /* Add Mesh Peering Management element */
289 switch (action) {
290 case WLAN_SP_MESH_PEERING_OPEN:
291 break;
292 case WLAN_SP_MESH_PEERING_CONFIRM:
293 ie_len += 2;
294 include_plid = true;
295 break;
296 case WLAN_SP_MESH_PEERING_CLOSE:
297 if (plid) {
298 ie_len += 2;
299 include_plid = true;
300 }
301 ie_len += 2; /* reason code */
302 break;
303 default:
304 err = -EINVAL;
305 goto free;
306 }
307
308 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
309 goto free;
310
311 pos = skb_put(skb, 2 + ie_len);
312 *pos++ = WLAN_EID_PEER_MGMT;
313 *pos++ = ie_len;
314 memcpy(pos, &peering_proto, 2);
315 pos += 2;
316 put_unaligned_le16(llid, pos);
317 pos += 2;
318 if (include_plid) {
319 put_unaligned_le16(plid, pos);
320 pos += 2;
321 }
322 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
323 put_unaligned_le16(reason, pos);
324 pos += 2;
325 }
326
327 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
328 if (mesh_add_ht_cap_ie(sdata, skb) ||
329 mesh_add_ht_oper_ie(sdata, skb) ||
330 mesh_add_vht_cap_ie(sdata, skb) ||
331 mesh_add_vht_oper_ie(sdata, skb) ||
332 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
333 mesh_add_he_oper_ie(sdata, skb) ||
334 mesh_add_he_6ghz_cap_ie(sdata, skb))
335 goto free;
336 }
337
338 if (mesh_add_vendor_ies(sdata, skb))
339 goto free;
340
341 ieee80211_tx_skb(sdata, skb);
342 return 0;
343free:
344 kfree_skb(skb);
345 return err;
346}
347
348/**
349 * __mesh_plink_deactivate - deactivate mesh peer link
350 *
351 * @sta: mesh peer link to deactivate
352 *
353 * Mesh paths with this peer as next hop should be flushed
354 * by the caller outside of plink_lock.
355 *
356 * Returns beacon changed flag if the beacon content changed.
357 *
358 * Locking: the caller must hold sta->mesh->plink_lock
359 */
360static u32 __mesh_plink_deactivate(struct sta_info *sta)
361{
362 struct ieee80211_sub_if_data *sdata = sta->sdata;
363 u32 changed = 0;
364
365 lockdep_assert_held(&sta->mesh->plink_lock);
366
367 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
368 changed = mesh_plink_dec_estab_count(sdata);
369 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
370
371 ieee80211_mps_sta_status_update(sta);
372 changed |= ieee80211_mps_set_sta_local_pm(sta,
373 NL80211_MESH_POWER_UNKNOWN);
374
375 return changed;
376}
377
378/**
379 * mesh_plink_deactivate - deactivate mesh peer link
380 *
381 * @sta: mesh peer link to deactivate
382 *
383 * All mesh paths with this peer as next hop will be flushed
384 */
385u32 mesh_plink_deactivate(struct sta_info *sta)
386{
387 struct ieee80211_sub_if_data *sdata = sta->sdata;
388 u32 changed;
389
390 spin_lock_bh(&sta->mesh->plink_lock);
391 changed = __mesh_plink_deactivate(sta);
392
393 if (!sdata->u.mesh.user_mpm) {
394 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
395 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
396 sta->sta.addr, sta->mesh->llid,
397 sta->mesh->plid, sta->mesh->reason);
398 }
399 spin_unlock_bh(&sta->mesh->plink_lock);
400 if (!sdata->u.mesh.user_mpm)
401 del_timer_sync(&sta->mesh->plink_timer);
402 mesh_path_flush_by_nexthop(sta);
403
404 /* make sure no readers can access nexthop sta from here on */
405 synchronize_net();
406
407 return changed;
408}
409
410static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
411 struct sta_info *sta,
412 struct ieee802_11_elems *elems)
413{
414 struct ieee80211_local *local = sdata->local;
415 struct ieee80211_supported_band *sband;
416 u32 rates, basic_rates = 0, changed = 0;
417 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
418
419 sband = ieee80211_get_sband(sdata);
420 if (!sband)
421 return;
422
423 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
424 &basic_rates);
425
426 spin_lock_bh(&sta->mesh->plink_lock);
427 sta->rx_stats.last_rx = jiffies;
428
429 /* rates and capabilities don't change during peering */
430 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
431 sta->mesh->processed_beacon)
432 goto out;
433 sta->mesh->processed_beacon = true;
434
435 if (sta->sta.supp_rates[sband->band] != rates)
436 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
437 sta->sta.supp_rates[sband->band] = rates;
438
439 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
440 elems->ht_cap_elem, sta))
441 changed |= IEEE80211_RC_BW_CHANGED;
442
443 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
444 elems->vht_cap_elem, sta);
445
446 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
447 elems->he_cap_len,
448 elems->he_6ghz_capa,
449 sta);
450
451 if (bw != sta->sta.bandwidth)
452 changed |= IEEE80211_RC_BW_CHANGED;
453
454 /* HT peer is operating 20MHz-only */
455 if (elems->ht_operation &&
456 !(elems->ht_operation->ht_param &
457 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
458 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
459 changed |= IEEE80211_RC_BW_CHANGED;
460 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
461 }
462
463 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
464 rate_control_rate_init(sta);
465 else
466 rate_control_rate_update(local, sband, sta, changed);
467out:
468 spin_unlock_bh(&sta->mesh->plink_lock);
469}
470
471static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
472{
473 struct sta_info *sta;
474 unsigned long *aid_map;
475 int aid;
476
477 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
478 sizeof(*aid_map), GFP_KERNEL);
479 if (!aid_map)
480 return -ENOMEM;
481
482 /* reserve aid 0 for mcast indication */
483 __set_bit(0, aid_map);
484
485 rcu_read_lock();
486 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
487 __set_bit(sta->sta.aid, aid_map);
488 rcu_read_unlock();
489
490 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
491 kfree(aid_map);
492
493 if (aid > IEEE80211_MAX_AID)
494 return -ENOBUFS;
495
496 return aid;
497}
498
499static struct sta_info *
500__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
501{
502 struct sta_info *sta;
503 int aid;
504
505 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
506 return NULL;
507
508 aid = mesh_allocate_aid(sdata);
509 if (aid < 0)
510 return NULL;
511
512 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
513 if (!sta)
514 return NULL;
515
516 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
517 sta->sta.wme = true;
518 sta->sta.aid = aid;
519
520 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
521 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
522 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
523
524 return sta;
525}
526
527static struct sta_info *
528mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
529 struct ieee802_11_elems *elems,
530 struct ieee80211_rx_status *rx_status)
531{
532 struct sta_info *sta = NULL;
533
534 /* Userspace handles station allocation */
535 if (sdata->u.mesh.user_mpm ||
536 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
537 if (mesh_peer_accepts_plinks(elems) &&
538 mesh_plink_availables(sdata)) {
539 int sig = 0;
540
541 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
542 sig = rx_status->signal;
543
544 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
545 elems->ie_start,
546 elems->total_len,
547 sig, GFP_KERNEL);
548 }
549 } else
550 sta = __mesh_sta_info_alloc(sdata, addr);
551
552 return sta;
553}
554
555/*
556 * mesh_sta_info_get - return mesh sta info entry for @addr.
557 *
558 * @sdata: local meshif
559 * @addr: peer's address
560 * @elems: IEs from beacon or mesh peering frame.
561 * @rx_status: rx status for the frame for signal reporting
562 *
563 * Return existing or newly allocated sta_info under RCU read lock.
564 * (re)initialize with given IEs.
565 */
566static struct sta_info *
567mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
568 u8 *addr, struct ieee802_11_elems *elems,
569 struct ieee80211_rx_status *rx_status) __acquires(RCU)
570{
571 struct sta_info *sta = NULL;
572
573 rcu_read_lock();
574 sta = sta_info_get(sdata, addr);
575 if (sta) {
576 mesh_sta_info_init(sdata, sta, elems);
577 } else {
578 rcu_read_unlock();
579 /* can't run atomic */
580 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
581 if (!sta) {
582 rcu_read_lock();
583 return NULL;
584 }
585
586 mesh_sta_info_init(sdata, sta, elems);
587
588 if (sta_info_insert_rcu(sta))
589 return NULL;
590 }
591
592 return sta;
593}
594
595/*
596 * mesh_neighbour_update - update or initialize new mesh neighbor.
597 *
598 * @sdata: local meshif
599 * @addr: peer's address
600 * @elems: IEs from beacon or mesh peering frame
601 * @rx_status: rx status for the frame for signal reporting
602 *
603 * Initiates peering if appropriate.
604 */
605void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
606 u8 *hw_addr,
607 struct ieee802_11_elems *elems,
608 struct ieee80211_rx_status *rx_status)
609{
610 struct sta_info *sta;
611 u32 changed = 0;
612
613 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
614 if (!sta)
615 goto out;
616
617 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
618 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
619
620 if (mesh_peer_accepts_plinks(elems) &&
621 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
622 sdata->u.mesh.accepting_plinks &&
623 sdata->u.mesh.mshcfg.auto_open_plinks &&
624 rssi_threshold_check(sdata, sta))
625 changed = mesh_plink_open(sta);
626
627 ieee80211_mps_frame_release(sta, elems);
628out:
629 rcu_read_unlock();
630 ieee80211_mbss_info_change_notify(sdata, changed);
631}
632
633void mesh_plink_timer(struct timer_list *t)
634{
635 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
636 struct sta_info *sta;
637 u16 reason = 0;
638 struct ieee80211_sub_if_data *sdata;
639 struct mesh_config *mshcfg;
640 enum ieee80211_self_protected_actioncode action = 0;
641
642 /*
643 * This STA is valid because sta_info_destroy() will
644 * del_timer_sync() this timer after having made sure
645 * it cannot be readded (by deleting the plink.)
646 */
647 sta = mesh->plink_sta;
648
649 if (sta->sdata->local->quiescing)
650 return;
651
652 spin_lock_bh(&sta->mesh->plink_lock);
653
654 /* If a timer fires just before a state transition on another CPU,
655 * we may have already extended the timeout and changed state by the
656 * time we've acquired the lock and arrived here. In that case,
657 * skip this timer and wait for the new one.
658 */
659 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
660 mpl_dbg(sta->sdata,
661 "Ignoring timer for %pM in state %s (timer adjusted)",
662 sta->sta.addr, mplstates[sta->mesh->plink_state]);
663 spin_unlock_bh(&sta->mesh->plink_lock);
664 return;
665 }
666
667 /* del_timer() and handler may race when entering these states */
668 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
669 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
670 mpl_dbg(sta->sdata,
671 "Ignoring timer for %pM in state %s (timer deleted)",
672 sta->sta.addr, mplstates[sta->mesh->plink_state]);
673 spin_unlock_bh(&sta->mesh->plink_lock);
674 return;
675 }
676
677 mpl_dbg(sta->sdata,
678 "Mesh plink timer for %pM fired on state %s\n",
679 sta->sta.addr, mplstates[sta->mesh->plink_state]);
680 sdata = sta->sdata;
681 mshcfg = &sdata->u.mesh.mshcfg;
682
683 switch (sta->mesh->plink_state) {
684 case NL80211_PLINK_OPN_RCVD:
685 case NL80211_PLINK_OPN_SNT:
686 /* retry timer */
687 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
688 u32 rand;
689 mpl_dbg(sta->sdata,
690 "Mesh plink for %pM (retry, timeout): %d %d\n",
691 sta->sta.addr, sta->mesh->plink_retries,
692 sta->mesh->plink_timeout);
693 get_random_bytes(&rand, sizeof(u32));
694 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
695 rand % sta->mesh->plink_timeout;
696 ++sta->mesh->plink_retries;
697 mod_plink_timer(sta, sta->mesh->plink_timeout);
698 action = WLAN_SP_MESH_PEERING_OPEN;
699 break;
700 }
701 reason = WLAN_REASON_MESH_MAX_RETRIES;
702 fallthrough;
703 case NL80211_PLINK_CNF_RCVD:
704 /* confirm timer */
705 if (!reason)
706 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
707 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
708 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
709 action = WLAN_SP_MESH_PEERING_CLOSE;
710 break;
711 case NL80211_PLINK_HOLDING:
712 /* holding timer */
713 del_timer(&sta->mesh->plink_timer);
714 mesh_plink_fsm_restart(sta);
715 break;
716 default:
717 break;
718 }
719 spin_unlock_bh(&sta->mesh->plink_lock);
720 if (action)
721 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
722 sta->mesh->llid, sta->mesh->plid, reason);
723}
724
725static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
726{
727 sta->mesh->plink_timeout = timeout;
728 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
729}
730
731static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
732 u16 llid)
733{
734 struct ieee80211_local *local = sdata->local;
735 bool in_use = false;
736 struct sta_info *sta;
737
738 rcu_read_lock();
739 list_for_each_entry_rcu(sta, &local->sta_list, list) {
740 if (sdata != sta->sdata)
741 continue;
742
743 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
744 in_use = true;
745 break;
746 }
747 }
748 rcu_read_unlock();
749
750 return in_use;
751}
752
753static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
754{
755 u16 llid;
756
757 do {
758 get_random_bytes(&llid, sizeof(llid));
759 } while (llid_in_use(sdata, llid));
760
761 return llid;
762}
763
764u32 mesh_plink_open(struct sta_info *sta)
765{
766 struct ieee80211_sub_if_data *sdata = sta->sdata;
767 u32 changed;
768
769 if (!test_sta_flag(sta, WLAN_STA_AUTH))
770 return 0;
771
772 spin_lock_bh(&sta->mesh->plink_lock);
773 sta->mesh->llid = mesh_get_new_llid(sdata);
774 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
775 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
776 spin_unlock_bh(&sta->mesh->plink_lock);
777 return 0;
778 }
779 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
780 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
781 spin_unlock_bh(&sta->mesh->plink_lock);
782 mpl_dbg(sdata,
783 "Mesh plink: starting establishment with %pM\n",
784 sta->sta.addr);
785
786 /* set the non-peer mode to active during peering */
787 changed = ieee80211_mps_local_status_update(sdata);
788
789 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
790 sta->sta.addr, sta->mesh->llid, 0, 0);
791 return changed;
792}
793
794u32 mesh_plink_block(struct sta_info *sta)
795{
796 u32 changed;
797
798 spin_lock_bh(&sta->mesh->plink_lock);
799 changed = __mesh_plink_deactivate(sta);
800 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
801 spin_unlock_bh(&sta->mesh->plink_lock);
802 mesh_path_flush_by_nexthop(sta);
803
804 return changed;
805}
806
807static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
808 struct sta_info *sta,
809 enum plink_event event)
810{
811 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
812 u16 reason = (event == CLS_ACPT) ?
813 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
814
815 sta->mesh->reason = reason;
816 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
817 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
818}
819
820static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
821 struct sta_info *sta)
822{
823 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
824 u32 changed = 0;
825
826 del_timer(&sta->mesh->plink_timer);
827 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
828 changed |= mesh_plink_inc_estab_count(sdata);
829 changed |= mesh_set_ht_prot_mode(sdata);
830 changed |= mesh_set_short_slot_time(sdata);
831 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
832 ieee80211_mps_sta_status_update(sta);
833 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
834 return changed;
835}
836
837/**
838 * mesh_plink_fsm - step @sta MPM based on @event
839 *
840 * @sdata: interface
841 * @sta: mesh neighbor
842 * @event: peering event
843 *
844 * Return: changed MBSS flags
845 */
846static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
847 struct sta_info *sta, enum plink_event event)
848{
849 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
850 enum ieee80211_self_protected_actioncode action = 0;
851 u32 changed = 0;
852 bool flush = false;
853
854 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
855 mplstates[sta->mesh->plink_state], mplevents[event]);
856
857 spin_lock_bh(&sta->mesh->plink_lock);
858 switch (sta->mesh->plink_state) {
859 case NL80211_PLINK_LISTEN:
860 switch (event) {
861 case CLS_ACPT:
862 mesh_plink_fsm_restart(sta);
863 break;
864 case OPN_ACPT:
865 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
866 sta->mesh->llid = mesh_get_new_llid(sdata);
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 action = WLAN_SP_MESH_PEERING_OPEN;
873 break;
874 default:
875 break;
876 }
877 break;
878 case NL80211_PLINK_OPN_SNT:
879 switch (event) {
880 case OPN_RJCT:
881 case CNF_RJCT:
882 case CLS_ACPT:
883 mesh_plink_close(sdata, sta, event);
884 action = WLAN_SP_MESH_PEERING_CLOSE;
885 break;
886 case OPN_ACPT:
887 /* retry timer is left untouched */
888 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
889 action = WLAN_SP_MESH_PEERING_CONFIRM;
890 break;
891 case CNF_ACPT:
892 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
893 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
894 break;
895 default:
896 break;
897 }
898 break;
899 case NL80211_PLINK_OPN_RCVD:
900 switch (event) {
901 case OPN_RJCT:
902 case CNF_RJCT:
903 case CLS_ACPT:
904 mesh_plink_close(sdata, sta, event);
905 action = WLAN_SP_MESH_PEERING_CLOSE;
906 break;
907 case OPN_ACPT:
908 action = WLAN_SP_MESH_PEERING_CONFIRM;
909 break;
910 case CNF_ACPT:
911 changed |= mesh_plink_establish(sdata, sta);
912 break;
913 default:
914 break;
915 }
916 break;
917 case NL80211_PLINK_CNF_RCVD:
918 switch (event) {
919 case OPN_RJCT:
920 case CNF_RJCT:
921 case CLS_ACPT:
922 mesh_plink_close(sdata, sta, event);
923 action = WLAN_SP_MESH_PEERING_CLOSE;
924 break;
925 case OPN_ACPT:
926 changed |= mesh_plink_establish(sdata, sta);
927 action = WLAN_SP_MESH_PEERING_CONFIRM;
928 break;
929 default:
930 break;
931 }
932 break;
933 case NL80211_PLINK_ESTAB:
934 switch (event) {
935 case CLS_ACPT:
936 changed |= __mesh_plink_deactivate(sta);
937 changed |= mesh_set_ht_prot_mode(sdata);
938 changed |= mesh_set_short_slot_time(sdata);
939 mesh_plink_close(sdata, sta, event);
940 action = WLAN_SP_MESH_PEERING_CLOSE;
941 flush = true;
942 break;
943 case OPN_ACPT:
944 action = WLAN_SP_MESH_PEERING_CONFIRM;
945 break;
946 default:
947 break;
948 }
949 break;
950 case NL80211_PLINK_HOLDING:
951 switch (event) {
952 case CLS_ACPT:
953 del_timer(&sta->mesh->plink_timer);
954 mesh_plink_fsm_restart(sta);
955 break;
956 case OPN_ACPT:
957 case CNF_ACPT:
958 case OPN_RJCT:
959 case CNF_RJCT:
960 action = WLAN_SP_MESH_PEERING_CLOSE;
961 break;
962 default:
963 break;
964 }
965 break;
966 default:
967 /* should not get here, PLINK_BLOCKED is dealt with at the
968 * beginning of the function
969 */
970 break;
971 }
972 spin_unlock_bh(&sta->mesh->plink_lock);
973 if (flush)
974 mesh_path_flush_by_nexthop(sta);
975 if (action) {
976 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
977 sta->mesh->llid, sta->mesh->plid,
978 sta->mesh->reason);
979
980 /* also send confirm in open case */
981 if (action == WLAN_SP_MESH_PEERING_OPEN) {
982 mesh_plink_frame_tx(sdata, sta,
983 WLAN_SP_MESH_PEERING_CONFIRM,
984 sta->sta.addr, sta->mesh->llid,
985 sta->mesh->plid, 0);
986 }
987 }
988
989 return changed;
990}
991
992/*
993 * mesh_plink_get_event - get correct MPM event
994 *
995 * @sdata: interface
996 * @sta: peer, leave NULL if processing a frame from a new suitable peer
997 * @elems: peering management IEs
998 * @ftype: frame type
999 * @llid: peer's peer link ID
1000 * @plid: peer's local link ID
1001 *
1002 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1003 * an error.
1004 */
1005static enum plink_event
1006mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1007 struct sta_info *sta,
1008 struct ieee802_11_elems *elems,
1009 enum ieee80211_self_protected_actioncode ftype,
1010 u16 llid, u16 plid)
1011{
1012 enum plink_event event = PLINK_UNDEFINED;
1013 u8 ie_len = elems->peering_len;
1014 bool matches_local;
1015
1016 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1017 mesh_matches_local(sdata, elems));
1018
1019 /* deny open request from non-matching peer */
1020 if (!matches_local && !sta) {
1021 event = OPN_RJCT;
1022 goto out;
1023 }
1024
1025 if (!sta) {
1026 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1027 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1028 goto out;
1029 }
1030 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1031 if (!mesh_plink_free_count(sdata)) {
1032 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1033 goto out;
1034 }
1035
1036 /* new matching peer */
1037 event = OPN_ACPT;
1038 goto out;
1039 } else {
1040 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1041 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1042 goto out;
1043 }
1044 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1045 goto out;
1046 }
1047
1048 switch (ftype) {
1049 case WLAN_SP_MESH_PEERING_OPEN:
1050 if (!matches_local)
1051 event = OPN_RJCT;
1052 if (!mesh_plink_free_count(sdata) ||
1053 (sta->mesh->plid && sta->mesh->plid != plid))
1054 event = OPN_IGNR;
1055 else
1056 event = OPN_ACPT;
1057 break;
1058 case WLAN_SP_MESH_PEERING_CONFIRM:
1059 if (!matches_local)
1060 event = CNF_RJCT;
1061 if (!mesh_plink_free_count(sdata) ||
1062 sta->mesh->llid != llid ||
1063 (sta->mesh->plid && sta->mesh->plid != plid))
1064 event = CNF_IGNR;
1065 else
1066 event = CNF_ACPT;
1067 break;
1068 case WLAN_SP_MESH_PEERING_CLOSE:
1069 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1070 /* Do not check for llid or plid. This does not
1071 * follow the standard but since multiple plinks
1072 * per sta are not supported, it is necessary in
1073 * order to avoid a livelock when MP A sees an
1074 * establish peer link to MP B but MP B does not
1075 * see it. This can be caused by a timeout in
1076 * B's peer link establishment or B beign
1077 * restarted.
1078 */
1079 event = CLS_ACPT;
1080 else if (sta->mesh->plid != plid)
1081 event = CLS_IGNR;
1082 else if (ie_len == 8 && sta->mesh->llid != llid)
1083 event = CLS_IGNR;
1084 else
1085 event = CLS_ACPT;
1086 break;
1087 default:
1088 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1089 break;
1090 }
1091
1092out:
1093 return event;
1094}
1095
1096static void
1097mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1098 struct ieee80211_mgmt *mgmt,
1099 struct ieee802_11_elems *elems,
1100 struct ieee80211_rx_status *rx_status)
1101{
1102
1103 struct sta_info *sta;
1104 enum plink_event event;
1105 enum ieee80211_self_protected_actioncode ftype;
1106 u32 changed = 0;
1107 u8 ie_len = elems->peering_len;
1108 u16 plid, llid = 0;
1109
1110 if (!elems->peering) {
1111 mpl_dbg(sdata,
1112 "Mesh plink: missing necessary peer link ie\n");
1113 return;
1114 }
1115
1116 if (elems->rsn_len &&
1117 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1118 mpl_dbg(sdata,
1119 "Mesh plink: can't establish link with secure peer\n");
1120 return;
1121 }
1122
1123 ftype = mgmt->u.action.u.self_prot.action_code;
1124 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1125 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1126 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1127 && ie_len != 8)) {
1128 mpl_dbg(sdata,
1129 "Mesh plink: incorrect plink ie length %d %d\n",
1130 ftype, ie_len);
1131 return;
1132 }
1133
1134 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1135 (!elems->mesh_id || !elems->mesh_config)) {
1136 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1137 return;
1138 }
1139 /* Note the lines below are correct, the llid in the frame is the plid
1140 * from the point of view of this host.
1141 */
1142 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1143 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1144 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1145 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1146
1147 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1148 rcu_read_lock();
1149
1150 sta = sta_info_get(sdata, mgmt->sa);
1151
1152 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1153 !rssi_threshold_check(sdata, sta)) {
1154 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1155 mgmt->sa);
1156 goto unlock_rcu;
1157 }
1158
1159 /* Now we will figure out the appropriate event... */
1160 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1161
1162 if (event == OPN_ACPT) {
1163 rcu_read_unlock();
1164 /* allocate sta entry if necessary and update info */
1165 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
1166 if (!sta) {
1167 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1168 goto unlock_rcu;
1169 }
1170 sta->mesh->plid = plid;
1171 } else if (!sta && event == OPN_RJCT) {
1172 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1173 mgmt->sa, 0, plid,
1174 WLAN_REASON_MESH_CONFIG);
1175 goto unlock_rcu;
1176 } else if (!sta || event == PLINK_UNDEFINED) {
1177 /* something went wrong */
1178 goto unlock_rcu;
1179 }
1180
1181 if (event == CNF_ACPT) {
1182 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1183 if (!sta->mesh->plid)
1184 sta->mesh->plid = plid;
1185
1186 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1187 }
1188
1189 changed |= mesh_plink_fsm(sdata, sta, event);
1190
1191unlock_rcu:
1192 rcu_read_unlock();
1193
1194 if (changed)
1195 ieee80211_mbss_info_change_notify(sdata, changed);
1196}
1197
1198void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1199 struct ieee80211_mgmt *mgmt, size_t len,
1200 struct ieee80211_rx_status *rx_status)
1201{
1202 struct ieee802_11_elems elems;
1203 size_t baselen;
1204 u8 *baseaddr;
1205
1206 /* need action_code, aux */
1207 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1208 return;
1209
1210 if (sdata->u.mesh.user_mpm)
1211 /* userspace must register for these */
1212 return;
1213
1214 if (is_multicast_ether_addr(mgmt->da)) {
1215 mpl_dbg(sdata,
1216 "Mesh plink: ignore frame from multicast address\n");
1217 return;
1218 }
1219
1220 baseaddr = mgmt->u.action.u.self_prot.variable;
1221 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1222 if (mgmt->u.action.u.self_prot.action_code ==
1223 WLAN_SP_MESH_PEERING_CONFIRM) {
1224 baseaddr += 4;
1225 baselen += 4;
1226
1227 if (baselen > len)
1228 return;
1229 }
1230 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems,
1231 mgmt->bssid, NULL);
1232 mesh_process_plink_frame(sdata, mgmt, &elems, rx_status);
1233}
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#ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
17#define mpl_dbg(fmt, args...) printk(KERN_DEBUG fmt, ##args)
18#else
19#define mpl_dbg(fmt, args...) do { (void)(0); } while (0)
20#endif
21
22#define PLINK_GET_LLID(p) (p + 4)
23#define PLINK_GET_PLID(p) (p + 6)
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
45enum plink_frame_type {
46 PLINK_OPEN = 1,
47 PLINK_CONFIRM,
48 PLINK_CLOSE
49};
50
51enum 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
63static inline
64void 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
70static inline
71void 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: mesh peer link to restart
81 *
82 * Locking: this function must be called holding sta->lock
83 */
84static inline void mesh_plink_fsm_restart(struct sta_info *sta)
85{
86 sta->plink_state = NL80211_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 */
95static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
96 u8 *hw_addr, u32 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_KERNEL);
105 if (!sta)
106 return NULL;
107
108 sta->flags = WLAN_STA_AUTHORIZED | WLAN_STA_AUTH;
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 */
124static bool __mesh_plink_deactivate(struct sta_info *sta)
125{
126 struct ieee80211_sub_if_data *sdata = sta->sdata;
127 bool deactivated = false;
128
129 if (sta->plink_state == NL80211_PLINK_ESTAB) {
130 mesh_plink_dec_estab_count(sdata);
131 deactivated = true;
132 }
133 sta->plink_state = NL80211_PLINK_BLOCKED;
134 mesh_path_flush_by_nexthop(sta);
135
136 return deactivated;
137}
138
139/**
140 * mesh_plink_deactivate - deactivate mesh peer link
141 *
142 * @sta: mesh peer link to deactivate
143 *
144 * All mesh paths with this peer as next hop will be flushed
145 */
146void mesh_plink_deactivate(struct sta_info *sta)
147{
148 struct ieee80211_sub_if_data *sdata = sta->sdata;
149 bool deactivated;
150
151 spin_lock_bh(&sta->lock);
152 deactivated = __mesh_plink_deactivate(sta);
153 spin_unlock_bh(&sta->lock);
154
155 if (deactivated)
156 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
157}
158
159static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
160 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
161 __le16 reason) {
162 struct ieee80211_local *local = sdata->local;
163 struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
164 sdata->u.mesh.ie_len);
165 struct ieee80211_mgmt *mgmt;
166 bool include_plid = false;
167 static const u8 meshpeeringproto[] = { 0x00, 0x0F, 0xAC, 0x2A };
168 u8 *pos;
169 int ie_len;
170
171 if (!skb)
172 return -1;
173 skb_reserve(skb, local->hw.extra_tx_headroom);
174 /* 25 is the size of the common mgmt part (24) plus the size of the
175 * common action part (1)
176 */
177 mgmt = (struct ieee80211_mgmt *)
178 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
179 memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
180 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
181 IEEE80211_STYPE_ACTION);
182 memcpy(mgmt->da, da, ETH_ALEN);
183 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
184 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
185 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
186 mgmt->u.action.u.plink_action.action_code = action;
187
188 if (action == PLINK_CLOSE)
189 mgmt->u.action.u.plink_action.aux = reason;
190 else {
191 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
192 if (action == PLINK_CONFIRM) {
193 pos = skb_put(skb, 4);
194 /* two-byte status code followed by two-byte AID */
195 memset(pos, 0, 2);
196 memcpy(pos + 2, &plid, 2);
197 }
198 mesh_mgmt_ies_add(skb, sdata);
199 }
200
201 /* Add Peer Link Management element */
202 switch (action) {
203 case PLINK_OPEN:
204 ie_len = 6;
205 break;
206 case PLINK_CONFIRM:
207 ie_len = 8;
208 include_plid = true;
209 break;
210 case PLINK_CLOSE:
211 default:
212 if (!plid)
213 ie_len = 8;
214 else {
215 ie_len = 10;
216 include_plid = true;
217 }
218 break;
219 }
220
221 pos = skb_put(skb, 2 + ie_len);
222 *pos++ = WLAN_EID_PEER_LINK;
223 *pos++ = ie_len;
224 memcpy(pos, meshpeeringproto, sizeof(meshpeeringproto));
225 pos += 4;
226 memcpy(pos, &llid, 2);
227 if (include_plid) {
228 pos += 2;
229 memcpy(pos, &plid, 2);
230 }
231 if (action == PLINK_CLOSE) {
232 pos += 2;
233 memcpy(pos, &reason, 2);
234 }
235
236 ieee80211_tx_skb(sdata, skb);
237 return 0;
238}
239
240void mesh_neighbour_update(u8 *hw_addr, u32 rates,
241 struct ieee80211_sub_if_data *sdata,
242 struct ieee802_11_elems *elems)
243{
244 struct ieee80211_local *local = sdata->local;
245 struct sta_info *sta;
246
247 rcu_read_lock();
248
249 sta = sta_info_get(sdata, hw_addr);
250 if (!sta) {
251 rcu_read_unlock();
252 /* Userspace handles peer allocation when security is enabled
253 * */
254 if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
255 cfg80211_notify_new_peer_candidate(sdata->dev, hw_addr,
256 elems->ie_start, elems->total_len,
257 GFP_KERNEL);
258 else
259 sta = mesh_plink_alloc(sdata, hw_addr, rates);
260 if (!sta)
261 return;
262 if (sta_info_insert_rcu(sta)) {
263 rcu_read_unlock();
264 return;
265 }
266 }
267
268 sta->last_rx = jiffies;
269 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
270 if (mesh_peer_accepts_plinks(elems) &&
271 sta->plink_state == NL80211_PLINK_LISTEN &&
272 sdata->u.mesh.accepting_plinks &&
273 sdata->u.mesh.mshcfg.auto_open_plinks)
274 mesh_plink_open(sta);
275
276 rcu_read_unlock();
277}
278
279static void mesh_plink_timer(unsigned long data)
280{
281 struct sta_info *sta;
282 __le16 llid, plid, reason;
283 struct ieee80211_sub_if_data *sdata;
284
285 /*
286 * This STA is valid because sta_info_destroy() will
287 * del_timer_sync() this timer after having made sure
288 * it cannot be readded (by deleting the plink.)
289 */
290 sta = (struct sta_info *) data;
291
292 if (sta->sdata->local->quiescing) {
293 sta->plink_timer_was_running = true;
294 return;
295 }
296
297 spin_lock_bh(&sta->lock);
298 if (sta->ignore_plink_timer) {
299 sta->ignore_plink_timer = false;
300 spin_unlock_bh(&sta->lock);
301 return;
302 }
303 mpl_dbg("Mesh plink timer for %pM fired on state %d\n",
304 sta->sta.addr, sta->plink_state);
305 reason = 0;
306 llid = sta->llid;
307 plid = sta->plid;
308 sdata = sta->sdata;
309
310 switch (sta->plink_state) {
311 case NL80211_PLINK_OPN_RCVD:
312 case NL80211_PLINK_OPN_SNT:
313 /* retry timer */
314 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
315 u32 rand;
316 mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n",
317 sta->sta.addr, sta->plink_retries,
318 sta->plink_timeout);
319 get_random_bytes(&rand, sizeof(u32));
320 sta->plink_timeout = sta->plink_timeout +
321 rand % sta->plink_timeout;
322 ++sta->plink_retries;
323 mod_plink_timer(sta, sta->plink_timeout);
324 spin_unlock_bh(&sta->lock);
325 mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
326 0, 0);
327 break;
328 }
329 reason = cpu_to_le16(MESH_MAX_RETRIES);
330 /* fall through on else */
331 case NL80211_PLINK_CNF_RCVD:
332 /* confirm timer */
333 if (!reason)
334 reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
335 sta->plink_state = NL80211_PLINK_HOLDING;
336 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
337 spin_unlock_bh(&sta->lock);
338 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid,
339 reason);
340 break;
341 case NL80211_PLINK_HOLDING:
342 /* holding timer */
343 del_timer(&sta->plink_timer);
344 mesh_plink_fsm_restart(sta);
345 spin_unlock_bh(&sta->lock);
346 break;
347 default:
348 spin_unlock_bh(&sta->lock);
349 break;
350 }
351}
352
353#ifdef CONFIG_PM
354void mesh_plink_quiesce(struct sta_info *sta)
355{
356 if (del_timer_sync(&sta->plink_timer))
357 sta->plink_timer_was_running = true;
358}
359
360void mesh_plink_restart(struct sta_info *sta)
361{
362 if (sta->plink_timer_was_running) {
363 add_timer(&sta->plink_timer);
364 sta->plink_timer_was_running = false;
365 }
366}
367#endif
368
369static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
370{
371 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
372 sta->plink_timer.data = (unsigned long) sta;
373 sta->plink_timer.function = mesh_plink_timer;
374 sta->plink_timeout = timeout;
375 add_timer(&sta->plink_timer);
376}
377
378int mesh_plink_open(struct sta_info *sta)
379{
380 __le16 llid;
381 struct ieee80211_sub_if_data *sdata = sta->sdata;
382
383 if (!test_sta_flags(sta, WLAN_STA_AUTH))
384 return -EPERM;
385
386 spin_lock_bh(&sta->lock);
387 get_random_bytes(&llid, 2);
388 sta->llid = llid;
389 if (sta->plink_state != NL80211_PLINK_LISTEN) {
390 spin_unlock_bh(&sta->lock);
391 return -EBUSY;
392 }
393 sta->plink_state = NL80211_PLINK_OPN_SNT;
394 mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
395 spin_unlock_bh(&sta->lock);
396 mpl_dbg("Mesh plink: starting establishment with %pM\n",
397 sta->sta.addr);
398
399 return mesh_plink_frame_tx(sdata, PLINK_OPEN,
400 sta->sta.addr, llid, 0, 0);
401}
402
403void mesh_plink_block(struct sta_info *sta)
404{
405 struct ieee80211_sub_if_data *sdata = sta->sdata;
406 bool deactivated;
407
408 spin_lock_bh(&sta->lock);
409 deactivated = __mesh_plink_deactivate(sta);
410 sta->plink_state = NL80211_PLINK_BLOCKED;
411 spin_unlock_bh(&sta->lock);
412
413 if (deactivated)
414 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
415}
416
417
418void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
419 size_t len, struct ieee80211_rx_status *rx_status)
420{
421 struct ieee80211_local *local = sdata->local;
422 struct ieee802_11_elems elems;
423 struct sta_info *sta;
424 enum plink_event event;
425 enum plink_frame_type ftype;
426 size_t baselen;
427 bool deactivated, matches_local = true;
428 u8 ie_len;
429 u8 *baseaddr;
430 __le16 plid, llid, reason;
431#ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
432 static const char *mplstates[] = {
433 [NL80211_PLINK_LISTEN] = "LISTEN",
434 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
435 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
436 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
437 [NL80211_PLINK_ESTAB] = "ESTAB",
438 [NL80211_PLINK_HOLDING] = "HOLDING",
439 [NL80211_PLINK_BLOCKED] = "BLOCKED"
440 };
441#endif
442
443 /* need action_code, aux */
444 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
445 return;
446
447 if (is_multicast_ether_addr(mgmt->da)) {
448 mpl_dbg("Mesh plink: ignore frame from multicast address");
449 return;
450 }
451
452 baseaddr = mgmt->u.action.u.plink_action.variable;
453 baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
454 if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
455 baseaddr += 4;
456 baselen += 4;
457 }
458 ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
459 if (!elems.peer_link) {
460 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
461 return;
462 }
463 if (elems.rsn_len &&
464 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
465 mpl_dbg("Mesh plink: can't establish link with secure peer\n");
466 return;
467 }
468
469 ftype = mgmt->u.action.u.plink_action.action_code;
470 ie_len = elems.peer_link_len;
471 if ((ftype == PLINK_OPEN && ie_len != 6) ||
472 (ftype == PLINK_CONFIRM && ie_len != 8) ||
473 (ftype == PLINK_CLOSE && ie_len != 8 && ie_len != 10)) {
474 mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n",
475 ftype, ie_len);
476 return;
477 }
478
479 if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
480 mpl_dbg("Mesh plink: missing necessary ie\n");
481 return;
482 }
483 /* Note the lines below are correct, the llid in the frame is the plid
484 * from the point of view of this host.
485 */
486 memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
487 if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 10))
488 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
489
490 rcu_read_lock();
491
492 sta = sta_info_get(sdata, mgmt->sa);
493 if (!sta && ftype != PLINK_OPEN) {
494 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
495 rcu_read_unlock();
496 return;
497 }
498
499 if (sta && !test_sta_flags(sta, WLAN_STA_AUTH)) {
500 mpl_dbg("Mesh plink: Action frame from non-authed peer\n");
501 rcu_read_unlock();
502 return;
503 }
504
505 if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) {
506 rcu_read_unlock();
507 return;
508 }
509
510 /* Now we will figure out the appropriate event... */
511 event = PLINK_UNDEFINED;
512 if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) {
513 matches_local = false;
514 switch (ftype) {
515 case PLINK_OPEN:
516 event = OPN_RJCT;
517 break;
518 case PLINK_CONFIRM:
519 event = CNF_RJCT;
520 break;
521 case PLINK_CLOSE:
522 /* avoid warning */
523 break;
524 }
525 }
526
527 if (!sta && !matches_local) {
528 rcu_read_unlock();
529 reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
530 llid = 0;
531 mesh_plink_frame_tx(sdata, PLINK_CLOSE, mgmt->sa, llid,
532 plid, reason);
533 return;
534 } else if (!sta) {
535 /* ftype == PLINK_OPEN */
536 u32 rates;
537
538 rcu_read_unlock();
539
540 if (!mesh_plink_free_count(sdata)) {
541 mpl_dbg("Mesh plink error: no more free plinks\n");
542 return;
543 }
544
545 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
546 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
547 if (!sta) {
548 mpl_dbg("Mesh plink error: plink table full\n");
549 return;
550 }
551 if (sta_info_insert_rcu(sta)) {
552 rcu_read_unlock();
553 return;
554 }
555 event = OPN_ACPT;
556 spin_lock_bh(&sta->lock);
557 } else if (matches_local) {
558 spin_lock_bh(&sta->lock);
559 switch (ftype) {
560 case PLINK_OPEN:
561 if (!mesh_plink_free_count(sdata) ||
562 (sta->plid && sta->plid != plid))
563 event = OPN_IGNR;
564 else
565 event = OPN_ACPT;
566 break;
567 case PLINK_CONFIRM:
568 if (!mesh_plink_free_count(sdata) ||
569 (sta->llid != llid || sta->plid != plid))
570 event = CNF_IGNR;
571 else
572 event = CNF_ACPT;
573 break;
574 case PLINK_CLOSE:
575 if (sta->plink_state == NL80211_PLINK_ESTAB)
576 /* Do not check for llid or plid. This does not
577 * follow the standard but since multiple plinks
578 * per sta are not supported, it is necessary in
579 * order to avoid a livelock when MP A sees an
580 * establish peer link to MP B but MP B does not
581 * see it. This can be caused by a timeout in
582 * B's peer link establishment or B beign
583 * restarted.
584 */
585 event = CLS_ACPT;
586 else if (sta->plid != plid)
587 event = CLS_IGNR;
588 else if (ie_len == 7 && sta->llid != llid)
589 event = CLS_IGNR;
590 else
591 event = CLS_ACPT;
592 break;
593 default:
594 mpl_dbg("Mesh plink: unknown frame subtype\n");
595 spin_unlock_bh(&sta->lock);
596 rcu_read_unlock();
597 return;
598 }
599 } else {
600 spin_lock_bh(&sta->lock);
601 }
602
603 mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
604 mgmt->sa, mplstates[sta->plink_state],
605 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
606 event);
607 reason = 0;
608 switch (sta->plink_state) {
609 /* spin_unlock as soon as state is updated at each case */
610 case NL80211_PLINK_LISTEN:
611 switch (event) {
612 case CLS_ACPT:
613 mesh_plink_fsm_restart(sta);
614 spin_unlock_bh(&sta->lock);
615 break;
616 case OPN_ACPT:
617 sta->plink_state = NL80211_PLINK_OPN_RCVD;
618 sta->plid = plid;
619 get_random_bytes(&llid, 2);
620 sta->llid = llid;
621 mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
622 spin_unlock_bh(&sta->lock);
623 mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
624 0, 0);
625 mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr,
626 llid, plid, 0);
627 break;
628 default:
629 spin_unlock_bh(&sta->lock);
630 break;
631 }
632 break;
633
634 case NL80211_PLINK_OPN_SNT:
635 switch (event) {
636 case OPN_RJCT:
637 case CNF_RJCT:
638 reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
639 case CLS_ACPT:
640 if (!reason)
641 reason = cpu_to_le16(MESH_CLOSE_RCVD);
642 sta->reason = reason;
643 sta->plink_state = NL80211_PLINK_HOLDING;
644 if (!mod_plink_timer(sta,
645 dot11MeshHoldingTimeout(sdata)))
646 sta->ignore_plink_timer = true;
647
648 llid = sta->llid;
649 spin_unlock_bh(&sta->lock);
650 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
651 plid, reason);
652 break;
653 case OPN_ACPT:
654 /* retry timer is left untouched */
655 sta->plink_state = NL80211_PLINK_OPN_RCVD;
656 sta->plid = plid;
657 llid = sta->llid;
658 spin_unlock_bh(&sta->lock);
659 mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
660 plid, 0);
661 break;
662 case CNF_ACPT:
663 sta->plink_state = NL80211_PLINK_CNF_RCVD;
664 if (!mod_plink_timer(sta,
665 dot11MeshConfirmTimeout(sdata)))
666 sta->ignore_plink_timer = true;
667
668 spin_unlock_bh(&sta->lock);
669 break;
670 default:
671 spin_unlock_bh(&sta->lock);
672 break;
673 }
674 break;
675
676 case NL80211_PLINK_OPN_RCVD:
677 switch (event) {
678 case OPN_RJCT:
679 case CNF_RJCT:
680 reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
681 case CLS_ACPT:
682 if (!reason)
683 reason = cpu_to_le16(MESH_CLOSE_RCVD);
684 sta->reason = reason;
685 sta->plink_state = NL80211_PLINK_HOLDING;
686 if (!mod_plink_timer(sta,
687 dot11MeshHoldingTimeout(sdata)))
688 sta->ignore_plink_timer = true;
689
690 llid = sta->llid;
691 spin_unlock_bh(&sta->lock);
692 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
693 plid, reason);
694 break;
695 case OPN_ACPT:
696 llid = sta->llid;
697 spin_unlock_bh(&sta->lock);
698 mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
699 plid, 0);
700 break;
701 case CNF_ACPT:
702 del_timer(&sta->plink_timer);
703 sta->plink_state = NL80211_PLINK_ESTAB;
704 spin_unlock_bh(&sta->lock);
705 mesh_plink_inc_estab_count(sdata);
706 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
707 mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
708 sta->sta.addr);
709 break;
710 default:
711 spin_unlock_bh(&sta->lock);
712 break;
713 }
714 break;
715
716 case NL80211_PLINK_CNF_RCVD:
717 switch (event) {
718 case OPN_RJCT:
719 case CNF_RJCT:
720 reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
721 case CLS_ACPT:
722 if (!reason)
723 reason = cpu_to_le16(MESH_CLOSE_RCVD);
724 sta->reason = reason;
725 sta->plink_state = NL80211_PLINK_HOLDING;
726 if (!mod_plink_timer(sta,
727 dot11MeshHoldingTimeout(sdata)))
728 sta->ignore_plink_timer = true;
729
730 llid = sta->llid;
731 spin_unlock_bh(&sta->lock);
732 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
733 plid, reason);
734 break;
735 case OPN_ACPT:
736 del_timer(&sta->plink_timer);
737 sta->plink_state = NL80211_PLINK_ESTAB;
738 spin_unlock_bh(&sta->lock);
739 mesh_plink_inc_estab_count(sdata);
740 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
741 mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
742 sta->sta.addr);
743 mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
744 plid, 0);
745 break;
746 default:
747 spin_unlock_bh(&sta->lock);
748 break;
749 }
750 break;
751
752 case NL80211_PLINK_ESTAB:
753 switch (event) {
754 case CLS_ACPT:
755 reason = cpu_to_le16(MESH_CLOSE_RCVD);
756 sta->reason = reason;
757 deactivated = __mesh_plink_deactivate(sta);
758 sta->plink_state = NL80211_PLINK_HOLDING;
759 llid = sta->llid;
760 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
761 spin_unlock_bh(&sta->lock);
762 if (deactivated)
763 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
764 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
765 plid, reason);
766 break;
767 case OPN_ACPT:
768 llid = sta->llid;
769 spin_unlock_bh(&sta->lock);
770 mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
771 plid, 0);
772 break;
773 default:
774 spin_unlock_bh(&sta->lock);
775 break;
776 }
777 break;
778 case NL80211_PLINK_HOLDING:
779 switch (event) {
780 case CLS_ACPT:
781 if (del_timer(&sta->plink_timer))
782 sta->ignore_plink_timer = 1;
783 mesh_plink_fsm_restart(sta);
784 spin_unlock_bh(&sta->lock);
785 break;
786 case OPN_ACPT:
787 case CNF_ACPT:
788 case OPN_RJCT:
789 case CNF_RJCT:
790 llid = sta->llid;
791 reason = sta->reason;
792 spin_unlock_bh(&sta->lock);
793 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr,
794 llid, plid, reason);
795 break;
796 default:
797 spin_unlock_bh(&sta->lock);
798 }
799 break;
800 default:
801 /* should not get here, PLINK_BLOCKED is dealt with at the
802 * beginning of the function
803 */
804 spin_unlock_bh(&sta->lock);
805 break;
806 }
807
808 rcu_read_unlock();
809}