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Merge tag 'pm-6.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
[linux-2.6-block.git] / net / mac80211 / mesh_plink.c
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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2019, 2021-2024 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->deflink.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 u64 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;
99 u64 changed = 0;
100 int i;
101 bool short_slot = false;
102
103 sband = ieee80211_get_sband(sdata);
104 if (!sband)
105 return changed;
106
107 if (sband->band == NL80211_BAND_5GHZ) {
108 /* (IEEE 802.11-2012 19.4.5) */
109 short_slot = true;
110 goto out;
111 } else if (sband->band != NL80211_BAND_2GHZ) {
112 goto out;
113 }
114
115 for (i = 0; i < sband->n_bitrates; i++)
116 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
117 erp_rates |= BIT(i);
118
119 if (!erp_rates)
120 goto out;
121
122 rcu_read_lock();
123 list_for_each_entry_rcu(sta, &local->sta_list, list) {
124 if (sdata != sta->sdata ||
125 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
126 continue;
127
128 short_slot = false;
129 if (erp_rates & sta->sta.deflink.supp_rates[sband->band])
130 short_slot = true;
131 else
132 break;
133 }
134 rcu_read_unlock();
135
136out:
137 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
138 sdata->vif.bss_conf.use_short_slot = short_slot;
139 changed = BSS_CHANGED_ERP_SLOT;
140 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
141 sdata->vif.addr, short_slot);
142 }
143 return changed;
144}
145
146/**
147 * mesh_set_ht_prot_mode - set correct HT protection mode
148 * @sdata: the (mesh) interface to handle
149 *
150 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
151 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
152 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
153 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
154 * is selected if all peers in our 20/40MHz MBSS support HT and at least one
155 * HT20 peer is present. Otherwise no-protection mode is selected.
156 *
157 * Returns: BSS_CHANGED_HT or 0 for no change
158 */
159static u64 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
160{
161 struct ieee80211_local *local = sdata->local;
162 struct sta_info *sta;
163 u16 ht_opmode;
164 bool non_ht_sta = false, ht20_sta = false;
165
166 switch (sdata->vif.bss_conf.chanreq.oper.width) {
167 case NL80211_CHAN_WIDTH_20_NOHT:
168 case NL80211_CHAN_WIDTH_5:
169 case NL80211_CHAN_WIDTH_10:
170 return 0;
171 default:
172 break;
173 }
174
175 rcu_read_lock();
176 list_for_each_entry_rcu(sta, &local->sta_list, list) {
177 if (sdata != sta->sdata ||
178 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
179 continue;
180
181 if (sta->sta.deflink.bandwidth > IEEE80211_STA_RX_BW_20)
182 continue;
183
184 if (!sta->sta.deflink.ht_cap.ht_supported) {
185 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
186 sta->sta.addr);
187 non_ht_sta = true;
188 break;
189 }
190
191 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
192 ht20_sta = true;
193 }
194 rcu_read_unlock();
195
196 if (non_ht_sta)
197 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
198 else if (ht20_sta &&
199 sdata->vif.bss_conf.chanreq.oper.width > NL80211_CHAN_WIDTH_20)
200 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
201 else
202 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
203
204 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
205 return 0;
206
207 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
208 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
209 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
210 return BSS_CHANGED_HT;
211}
212
213static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
214 struct sta_info *sta,
215 enum ieee80211_self_protected_actioncode action,
216 u8 *da, u16 llid, u16 plid, u16 reason)
217{
218 struct ieee80211_local *local = sdata->local;
219 struct sk_buff *skb;
220 struct ieee80211_tx_info *info;
221 struct ieee80211_mgmt *mgmt;
222 bool include_plid = false;
223 u16 peering_proto = 0;
224 u8 *pos, ie_len = 4;
225 u8 ie_len_he_cap, ie_len_eht_cap;
226 int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
227 int err = -ENOMEM;
228
229 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata);
230 ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata);
231 skb = dev_alloc_skb(local->tx_headroom +
232 hdr_len +
233 2 + /* capability info */
234 2 + /* AID */
235 2 + 8 + /* supported rates */
236 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
237 2 + sdata->u.mesh.mesh_id_len +
238 2 + sizeof(struct ieee80211_meshconf_ie) +
239 2 + sizeof(struct ieee80211_ht_cap) +
240 2 + sizeof(struct ieee80211_ht_operation) +
241 2 + sizeof(struct ieee80211_vht_cap) +
242 2 + sizeof(struct ieee80211_vht_operation) +
243 ie_len_he_cap +
244 2 + 1 + sizeof(struct ieee80211_he_operation) +
245 sizeof(struct ieee80211_he_6ghz_oper) +
246 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
247 ie_len_eht_cap +
248 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
249 offsetof(struct ieee80211_eht_operation_info, optional) +
250 2 + 8 + /* peering IE */
251 sdata->u.mesh.ie_len);
252 if (!skb)
253 return err;
254 info = IEEE80211_SKB_CB(skb);
255 skb_reserve(skb, local->tx_headroom);
256 mgmt = skb_put_zero(skb, hdr_len);
257 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
258 IEEE80211_STYPE_ACTION);
259 memcpy(mgmt->da, da, ETH_ALEN);
260 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
261 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
262 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
263 mgmt->u.action.u.self_prot.action_code = action;
264
265 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
266 struct ieee80211_supported_band *sband;
267 u32 basic_rates;
268
269 sband = ieee80211_get_sband(sdata);
270 if (!sband) {
271 err = -EINVAL;
272 goto free;
273 }
274
275 /* capability info */
276 pos = skb_put_zero(skb, 2);
277 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
278 /* AID */
279 pos = skb_put(skb, 2);
280 put_unaligned_le16(sta->sta.aid, pos);
281 }
282
283 basic_rates = sdata->vif.bss_conf.basic_rates;
284
285 if (ieee80211_put_srates_elem(skb, sband, basic_rates,
286 0, WLAN_EID_SUPP_RATES) ||
287 ieee80211_put_srates_elem(skb, sband, basic_rates,
288 0, WLAN_EID_EXT_SUPP_RATES) ||
289 mesh_add_rsn_ie(sdata, skb) ||
290 mesh_add_meshid_ie(sdata, skb) ||
291 mesh_add_meshconf_ie(sdata, skb))
292 goto free;
293 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
294 info->flags |= IEEE80211_TX_CTL_NO_ACK;
295 if (mesh_add_meshid_ie(sdata, skb))
296 goto free;
297 }
298
299 /* Add Mesh Peering Management element */
300 switch (action) {
301 case WLAN_SP_MESH_PEERING_OPEN:
302 break;
303 case WLAN_SP_MESH_PEERING_CONFIRM:
304 ie_len += 2;
305 include_plid = true;
306 break;
307 case WLAN_SP_MESH_PEERING_CLOSE:
308 if (plid) {
309 ie_len += 2;
310 include_plid = true;
311 }
312 ie_len += 2; /* reason code */
313 break;
314 default:
315 err = -EINVAL;
316 goto free;
317 }
318
319 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
320 goto free;
321
322 pos = skb_put(skb, 2 + ie_len);
323 *pos++ = WLAN_EID_PEER_MGMT;
324 *pos++ = ie_len;
325 memcpy(pos, &peering_proto, 2);
326 pos += 2;
327 put_unaligned_le16(llid, pos);
328 pos += 2;
329 if (include_plid) {
330 put_unaligned_le16(plid, pos);
331 pos += 2;
332 }
333 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
334 put_unaligned_le16(reason, pos);
335 pos += 2;
336 }
337
338 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
339 if (mesh_add_ht_cap_ie(sdata, skb) ||
340 mesh_add_ht_oper_ie(sdata, skb) ||
341 mesh_add_vht_cap_ie(sdata, skb) ||
342 mesh_add_vht_oper_ie(sdata, skb) ||
343 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
344 mesh_add_he_oper_ie(sdata, skb) ||
345 mesh_add_he_6ghz_cap_ie(sdata, skb) ||
346 mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
347 mesh_add_eht_oper_ie(sdata, skb))
348 goto free;
349 }
350
351 if (mesh_add_vendor_ies(sdata, skb))
352 goto free;
353
354 ieee80211_tx_skb(sdata, skb);
355 return 0;
356free:
357 kfree_skb(skb);
358 return err;
359}
360
361/**
362 * __mesh_plink_deactivate - deactivate mesh peer link
363 *
364 * @sta: mesh peer link to deactivate
365 *
366 * Mesh paths with this peer as next hop should be flushed
367 * by the caller outside of plink_lock.
368 *
369 * Returns: beacon changed flag if the beacon content changed.
370 *
371 * Locking: the caller must hold sta->mesh->plink_lock
372 */
373static u64 __mesh_plink_deactivate(struct sta_info *sta)
374{
375 struct ieee80211_sub_if_data *sdata = sta->sdata;
376 u64 changed = 0;
377
378 lockdep_assert_held(&sta->mesh->plink_lock);
379
380 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
381 changed = mesh_plink_dec_estab_count(sdata);
382 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
383
384 ieee80211_mps_sta_status_update(sta);
385 changed |= ieee80211_mps_set_sta_local_pm(sta,
386 NL80211_MESH_POWER_UNKNOWN);
387
388 return changed;
389}
390
391/**
392 * mesh_plink_deactivate - deactivate mesh peer link
393 *
394 * @sta: mesh peer link to deactivate
395 *
396 * All mesh paths with this peer as next hop will be flushed
397 *
398 * Returns: beacon changed flag if the beacon content changed.
399 */
400u64 mesh_plink_deactivate(struct sta_info *sta)
401{
402 struct ieee80211_sub_if_data *sdata = sta->sdata;
403 u64 changed;
404
405 spin_lock_bh(&sta->mesh->plink_lock);
406 changed = __mesh_plink_deactivate(sta);
407
408 if (!sdata->u.mesh.user_mpm) {
409 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
410 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
411 sta->sta.addr, sta->mesh->llid,
412 sta->mesh->plid, sta->mesh->reason);
413 }
414 spin_unlock_bh(&sta->mesh->plink_lock);
415 if (!sdata->u.mesh.user_mpm)
416 timer_delete_sync(&sta->mesh->plink_timer);
417 mesh_path_flush_by_nexthop(sta);
418
419 /* make sure no readers can access nexthop sta from here on */
420 synchronize_net();
421
422 return changed;
423}
424
425static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
426 struct sta_info *sta,
427 struct ieee802_11_elems *elems)
428{
429 struct ieee80211_local *local = sdata->local;
430 struct ieee80211_supported_band *sband;
431 u32 rates, changed = 0;
432 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
433
434 sband = ieee80211_get_sband(sdata);
435 if (!sband)
436 return;
437
438 rates = ieee80211_sta_get_rates(sdata, elems, sband->band, NULL);
439
440 spin_lock_bh(&sta->mesh->plink_lock);
441 sta->deflink.rx_stats.last_rx = jiffies;
442
443 /* rates and capabilities don't change during peering */
444 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
445 sta->mesh->processed_beacon)
446 goto out;
447 sta->mesh->processed_beacon = true;
448
449 if (sta->sta.deflink.supp_rates[sband->band] != rates)
450 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
451 sta->sta.deflink.supp_rates[sband->band] = rates;
452
453 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
454 elems->ht_cap_elem,
455 &sta->deflink))
456 changed |= IEEE80211_RC_BW_CHANGED;
457
458 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
459 elems->vht_cap_elem, NULL,
460 &sta->deflink);
461
462 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
463 elems->he_cap_len,
464 elems->he_6ghz_capa,
465 &sta->deflink);
466
467 ieee80211_eht_cap_ie_to_sta_eht_cap(sdata, sband, elems->he_cap,
468 elems->he_cap_len,
469 elems->eht_cap, elems->eht_cap_len,
470 &sta->deflink);
471
472 if (bw != sta->sta.deflink.bandwidth)
473 changed |= IEEE80211_RC_BW_CHANGED;
474
475 /* HT peer is operating 20MHz-only */
476 if (elems->ht_operation &&
477 !(elems->ht_operation->ht_param &
478 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
479 if (sta->sta.deflink.bandwidth != IEEE80211_STA_RX_BW_20)
480 changed |= IEEE80211_RC_BW_CHANGED;
481 sta->sta.deflink.bandwidth = IEEE80211_STA_RX_BW_20;
482 }
483
484 /* FIXME: this check is wrong without SW rate control */
485 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
486 rate_control_rate_init(&sta->deflink);
487 else
488 rate_control_rate_update(local, sband, &sta->deflink, changed);
489out:
490 spin_unlock_bh(&sta->mesh->plink_lock);
491}
492
493static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
494{
495 struct sta_info *sta;
496 unsigned long *aid_map;
497 int aid;
498
499 aid_map = bitmap_zalloc(IEEE80211_MAX_AID + 1, GFP_KERNEL);
500 if (!aid_map)
501 return -ENOMEM;
502
503 /* reserve aid 0 for mcast indication */
504 __set_bit(0, aid_map);
505
506 rcu_read_lock();
507 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
508 __set_bit(sta->sta.aid, aid_map);
509 rcu_read_unlock();
510
511 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
512 bitmap_free(aid_map);
513
514 if (aid > IEEE80211_MAX_AID)
515 return -ENOBUFS;
516
517 return aid;
518}
519
520static struct sta_info *
521__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
522{
523 struct sta_info *sta;
524 int aid;
525
526 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
527 return NULL;
528
529 aid = mesh_allocate_aid(sdata);
530 if (aid < 0)
531 return NULL;
532
533 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
534 if (!sta)
535 return NULL;
536
537 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
538 sta->sta.wme = true;
539 sta->sta.aid = aid;
540
541 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
542 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
543 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
544
545 return sta;
546}
547
548static struct sta_info *
549mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
550 struct ieee802_11_elems *elems,
551 struct ieee80211_rx_status *rx_status)
552{
553 struct sta_info *sta = NULL;
554
555 /* Userspace handles station allocation */
556 if (sdata->u.mesh.user_mpm ||
557 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
558 if (mesh_peer_accepts_plinks(elems) &&
559 mesh_plink_availables(sdata)) {
560 int sig = 0;
561
562 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
563 sig = rx_status->signal;
564
565 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
566 elems->ie_start,
567 elems->total_len,
568 sig, GFP_KERNEL);
569 }
570 } else
571 sta = __mesh_sta_info_alloc(sdata, addr);
572
573 return sta;
574}
575
576/*
577 * mesh_sta_info_get - return mesh sta info entry for @addr.
578 *
579 * @sdata: local meshif
580 * @addr: peer's address
581 * @elems: IEs from beacon or mesh peering frame.
582 * @rx_status: rx status for the frame for signal reporting
583 *
584 * Return existing or newly allocated sta_info under RCU read lock.
585 * (re)initialize with given IEs.
586 */
587static struct sta_info *
588mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
589 u8 *addr, struct ieee802_11_elems *elems,
590 struct ieee80211_rx_status *rx_status) __acquires(RCU)
591{
592 struct sta_info *sta = NULL;
593
594 rcu_read_lock();
595 sta = sta_info_get(sdata, addr);
596 if (sta) {
597 mesh_sta_info_init(sdata, sta, elems);
598 } else {
599 rcu_read_unlock();
600 /* can't run atomic */
601 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
602 if (!sta) {
603 rcu_read_lock();
604 return NULL;
605 }
606
607 mesh_sta_info_init(sdata, sta, elems);
608
609 if (sta_info_insert_rcu(sta))
610 return NULL;
611 }
612
613 return sta;
614}
615
616/*
617 * mesh_neighbour_update - update or initialize new mesh neighbor.
618 *
619 * @sdata: local meshif
620 * @addr: peer's address
621 * @elems: IEs from beacon or mesh peering frame
622 * @rx_status: rx status for the frame for signal reporting
623 *
624 * Initiates peering if appropriate.
625 */
626void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
627 u8 *hw_addr,
628 struct ieee802_11_elems *elems,
629 struct ieee80211_rx_status *rx_status)
630{
631 struct sta_info *sta;
632 u64 changed = 0;
633
634 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
635 if (!sta)
636 goto out;
637
638 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
639 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
640
641 if (mesh_peer_accepts_plinks(elems) &&
642 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
643 sdata->u.mesh.accepting_plinks &&
644 sdata->u.mesh.mshcfg.auto_open_plinks &&
645 rssi_threshold_check(sdata, sta))
646 changed = mesh_plink_open(sta);
647
648 ieee80211_mps_frame_release(sta, elems);
649out:
650 rcu_read_unlock();
651 ieee80211_mbss_info_change_notify(sdata, changed);
652}
653
654void mesh_plink_timer(struct timer_list *t)
655{
656 struct mesh_sta *mesh = timer_container_of(mesh, t, plink_timer);
657 struct sta_info *sta;
658 u16 reason = 0;
659 struct ieee80211_sub_if_data *sdata;
660 struct mesh_config *mshcfg;
661 enum ieee80211_self_protected_actioncode action = 0;
662
663 /*
664 * This STA is valid because sta_info_destroy() will
665 * timer_delete_sync() this timer after having made sure
666 * it cannot be re-added (by deleting the plink.)
667 */
668 sta = mesh->plink_sta;
669
670 if (sta->sdata->local->quiescing)
671 return;
672
673 spin_lock_bh(&sta->mesh->plink_lock);
674
675 /* If a timer fires just before a state transition on another CPU,
676 * we may have already extended the timeout and changed state by the
677 * time we've acquired the lock and arrived here. In that case,
678 * skip this timer and wait for the new one.
679 */
680 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
681 mpl_dbg(sta->sdata,
682 "Ignoring timer for %pM in state %s (timer adjusted)",
683 sta->sta.addr, mplstates[sta->mesh->plink_state]);
684 spin_unlock_bh(&sta->mesh->plink_lock);
685 return;
686 }
687
688 /* timer_delete() and handler may race when entering these states */
689 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
690 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
691 mpl_dbg(sta->sdata,
692 "Ignoring timer for %pM in state %s (timer deleted)",
693 sta->sta.addr, mplstates[sta->mesh->plink_state]);
694 spin_unlock_bh(&sta->mesh->plink_lock);
695 return;
696 }
697
698 mpl_dbg(sta->sdata,
699 "Mesh plink timer for %pM fired on state %s\n",
700 sta->sta.addr, mplstates[sta->mesh->plink_state]);
701 sdata = sta->sdata;
702 mshcfg = &sdata->u.mesh.mshcfg;
703
704 switch (sta->mesh->plink_state) {
705 case NL80211_PLINK_OPN_RCVD:
706 case NL80211_PLINK_OPN_SNT:
707 /* retry timer */
708 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
709 u32 rand;
710 mpl_dbg(sta->sdata,
711 "Mesh plink for %pM (retry, timeout): %d %d\n",
712 sta->sta.addr, sta->mesh->plink_retries,
713 sta->mesh->plink_timeout);
714 get_random_bytes(&rand, sizeof(u32));
715 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
716 rand % sta->mesh->plink_timeout;
717 ++sta->mesh->plink_retries;
718 mod_plink_timer(sta, sta->mesh->plink_timeout);
719 action = WLAN_SP_MESH_PEERING_OPEN;
720 break;
721 }
722 reason = WLAN_REASON_MESH_MAX_RETRIES;
723 fallthrough;
724 case NL80211_PLINK_CNF_RCVD:
725 /* confirm timer */
726 if (!reason)
727 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
728 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
729 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
730 action = WLAN_SP_MESH_PEERING_CLOSE;
731 break;
732 case NL80211_PLINK_HOLDING:
733 /* holding timer */
734 timer_delete(&sta->mesh->plink_timer);
735 mesh_plink_fsm_restart(sta);
736 break;
737 default:
738 break;
739 }
740 spin_unlock_bh(&sta->mesh->plink_lock);
741 if (action)
742 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
743 sta->mesh->llid, sta->mesh->plid, reason);
744}
745
746static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
747{
748 sta->mesh->plink_timeout = timeout;
749 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
750}
751
752static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
753 u16 llid)
754{
755 struct ieee80211_local *local = sdata->local;
756 bool in_use = false;
757 struct sta_info *sta;
758
759 rcu_read_lock();
760 list_for_each_entry_rcu(sta, &local->sta_list, list) {
761 if (sdata != sta->sdata)
762 continue;
763
764 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
765 in_use = true;
766 break;
767 }
768 }
769 rcu_read_unlock();
770
771 return in_use;
772}
773
774static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
775{
776 u16 llid;
777
778 do {
779 get_random_bytes(&llid, sizeof(llid));
780 } while (llid_in_use(sdata, llid));
781
782 return llid;
783}
784
785u64 mesh_plink_open(struct sta_info *sta)
786{
787 struct ieee80211_sub_if_data *sdata = sta->sdata;
788 u64 changed;
789
790 if (!test_sta_flag(sta, WLAN_STA_AUTH))
791 return 0;
792
793 spin_lock_bh(&sta->mesh->plink_lock);
794 sta->mesh->llid = mesh_get_new_llid(sdata);
795 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
796 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
797 spin_unlock_bh(&sta->mesh->plink_lock);
798 return 0;
799 }
800 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
801 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
802 spin_unlock_bh(&sta->mesh->plink_lock);
803 mpl_dbg(sdata,
804 "Mesh plink: starting establishment with %pM\n",
805 sta->sta.addr);
806
807 /* set the non-peer mode to active during peering */
808 changed = ieee80211_mps_local_status_update(sdata);
809
810 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
811 sta->sta.addr, sta->mesh->llid, 0, 0);
812 return changed;
813}
814
815u64 mesh_plink_block(struct sta_info *sta)
816{
817 u64 changed;
818
819 spin_lock_bh(&sta->mesh->plink_lock);
820 changed = __mesh_plink_deactivate(sta);
821 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
822 spin_unlock_bh(&sta->mesh->plink_lock);
823 mesh_path_flush_by_nexthop(sta);
824
825 return changed;
826}
827
828static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
829 struct sta_info *sta,
830 enum plink_event event)
831{
832 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
833 u16 reason = (event == CLS_ACPT) ?
834 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
835
836 sta->mesh->reason = reason;
837 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
838 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
839}
840
841static u64 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
842 struct sta_info *sta)
843{
844 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
845 u64 changed = 0;
846
847 timer_delete(&sta->mesh->plink_timer);
848 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
849 changed |= mesh_plink_inc_estab_count(sdata);
850 changed |= mesh_set_ht_prot_mode(sdata);
851 changed |= mesh_set_short_slot_time(sdata);
852 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
853 ieee80211_mps_sta_status_update(sta);
854 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
855 return changed;
856}
857
858/**
859 * mesh_plink_fsm - step @sta MPM based on @event
860 *
861 * @sdata: interface
862 * @sta: mesh neighbor
863 * @event: peering event
864 *
865 * Return: changed MBSS flags
866 */
867static u64 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
868 struct sta_info *sta, enum plink_event event)
869{
870 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
871 enum ieee80211_self_protected_actioncode action = 0;
872 u64 changed = 0;
873 bool flush = false;
874
875 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
876 mplstates[sta->mesh->plink_state], mplevents[event]);
877
878 spin_lock_bh(&sta->mesh->plink_lock);
879 switch (sta->mesh->plink_state) {
880 case NL80211_PLINK_LISTEN:
881 switch (event) {
882 case CLS_ACPT:
883 mesh_plink_fsm_restart(sta);
884 break;
885 case OPN_ACPT:
886 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
887 sta->mesh->llid = mesh_get_new_llid(sdata);
888 mesh_plink_timer_set(sta,
889 mshcfg->dot11MeshRetryTimeout);
890
891 /* set the non-peer mode to active during peering */
892 changed |= ieee80211_mps_local_status_update(sdata);
893 action = WLAN_SP_MESH_PEERING_OPEN;
894 break;
895 default:
896 break;
897 }
898 break;
899 case NL80211_PLINK_OPN_SNT:
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 /* retry timer is left untouched */
909 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
910 action = WLAN_SP_MESH_PEERING_CONFIRM;
911 break;
912 case CNF_ACPT:
913 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
914 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
915 break;
916 default:
917 break;
918 }
919 break;
920 case NL80211_PLINK_OPN_RCVD:
921 switch (event) {
922 case OPN_RJCT:
923 case CNF_RJCT:
924 case CLS_ACPT:
925 mesh_plink_close(sdata, sta, event);
926 action = WLAN_SP_MESH_PEERING_CLOSE;
927 break;
928 case OPN_ACPT:
929 action = WLAN_SP_MESH_PEERING_CONFIRM;
930 break;
931 case CNF_ACPT:
932 changed |= mesh_plink_establish(sdata, sta);
933 break;
934 default:
935 break;
936 }
937 break;
938 case NL80211_PLINK_CNF_RCVD:
939 switch (event) {
940 case OPN_RJCT:
941 case CNF_RJCT:
942 case CLS_ACPT:
943 mesh_plink_close(sdata, sta, event);
944 action = WLAN_SP_MESH_PEERING_CLOSE;
945 break;
946 case OPN_ACPT:
947 changed |= mesh_plink_establish(sdata, sta);
948 action = WLAN_SP_MESH_PEERING_CONFIRM;
949 break;
950 default:
951 break;
952 }
953 break;
954 case NL80211_PLINK_ESTAB:
955 switch (event) {
956 case CLS_ACPT:
957 changed |= __mesh_plink_deactivate(sta);
958 changed |= mesh_set_ht_prot_mode(sdata);
959 changed |= mesh_set_short_slot_time(sdata);
960 mesh_plink_close(sdata, sta, event);
961 action = WLAN_SP_MESH_PEERING_CLOSE;
962 flush = true;
963 break;
964 case OPN_ACPT:
965 action = WLAN_SP_MESH_PEERING_CONFIRM;
966 break;
967 default:
968 break;
969 }
970 break;
971 case NL80211_PLINK_HOLDING:
972 switch (event) {
973 case CLS_ACPT:
974 timer_delete(&sta->mesh->plink_timer);
975 mesh_plink_fsm_restart(sta);
976 break;
977 case OPN_ACPT:
978 case CNF_ACPT:
979 case OPN_RJCT:
980 case CNF_RJCT:
981 action = WLAN_SP_MESH_PEERING_CLOSE;
982 break;
983 default:
984 break;
985 }
986 break;
987 default:
988 /* should not get here, PLINK_BLOCKED is dealt with at the
989 * beginning of the function
990 */
991 break;
992 }
993 spin_unlock_bh(&sta->mesh->plink_lock);
994 if (flush)
995 mesh_path_flush_by_nexthop(sta);
996 if (action) {
997 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
998 sta->mesh->llid, sta->mesh->plid,
999 sta->mesh->reason);
1000
1001 /* also send confirm in open case */
1002 if (action == WLAN_SP_MESH_PEERING_OPEN) {
1003 mesh_plink_frame_tx(sdata, sta,
1004 WLAN_SP_MESH_PEERING_CONFIRM,
1005 sta->sta.addr, sta->mesh->llid,
1006 sta->mesh->plid, 0);
1007 }
1008 }
1009
1010 return changed;
1011}
1012
1013/*
1014 * mesh_plink_get_event - get correct MPM event
1015 *
1016 * @sdata: interface
1017 * @sta: peer, leave NULL if processing a frame from a new suitable peer
1018 * @elems: peering management IEs
1019 * @ftype: frame type
1020 * @llid: peer's peer link ID
1021 * @plid: peer's local link ID
1022 *
1023 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1024 * an error.
1025 */
1026static enum plink_event
1027mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1028 struct sta_info *sta,
1029 struct ieee802_11_elems *elems,
1030 enum ieee80211_self_protected_actioncode ftype,
1031 u16 llid, u16 plid)
1032{
1033 enum plink_event event = PLINK_UNDEFINED;
1034 u8 ie_len = elems->peering_len;
1035 bool matches_local;
1036
1037 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1038 mesh_matches_local(sdata, elems));
1039
1040 /* deny open request from non-matching peer */
1041 if (!matches_local && !sta) {
1042 event = OPN_RJCT;
1043 goto out;
1044 }
1045
1046 if (!sta) {
1047 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1048 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1049 goto out;
1050 }
1051 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1052 if (!mesh_plink_free_count(sdata)) {
1053 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1054 goto out;
1055 }
1056
1057 /* new matching peer */
1058 event = OPN_ACPT;
1059 goto out;
1060 } else {
1061 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1062 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1063 goto out;
1064 }
1065 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1066 goto out;
1067 }
1068
1069 switch (ftype) {
1070 case WLAN_SP_MESH_PEERING_OPEN:
1071 if (!matches_local)
1072 event = OPN_RJCT;
1073 else if (!mesh_plink_free_count(sdata) ||
1074 (sta->mesh->plid && sta->mesh->plid != plid))
1075 event = OPN_IGNR;
1076 else
1077 event = OPN_ACPT;
1078 break;
1079 case WLAN_SP_MESH_PEERING_CONFIRM:
1080 if (!matches_local)
1081 event = CNF_RJCT;
1082 else if (!mesh_plink_free_count(sdata) ||
1083 sta->mesh->llid != llid ||
1084 (sta->mesh->plid && sta->mesh->plid != plid))
1085 event = CNF_IGNR;
1086 else
1087 event = CNF_ACPT;
1088 break;
1089 case WLAN_SP_MESH_PEERING_CLOSE:
1090 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1091 /* Do not check for llid or plid. This does not
1092 * follow the standard but since multiple plinks
1093 * per sta are not supported, it is necessary in
1094 * order to avoid a livelock when MP A sees an
1095 * establish peer link to MP B but MP B does not
1096 * see it. This can be caused by a timeout in
1097 * B's peer link establishment or B beign
1098 * restarted.
1099 */
1100 event = CLS_ACPT;
1101 else if (sta->mesh->plid != plid)
1102 event = CLS_IGNR;
1103 else if (ie_len == 8 && sta->mesh->llid != llid)
1104 event = CLS_IGNR;
1105 else
1106 event = CLS_ACPT;
1107 break;
1108 default:
1109 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1110 break;
1111 }
1112
1113out:
1114 return event;
1115}
1116
1117static void
1118mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1119 struct ieee80211_mgmt *mgmt,
1120 struct ieee802_11_elems *elems,
1121 struct ieee80211_rx_status *rx_status)
1122{
1123
1124 struct sta_info *sta;
1125 enum plink_event event;
1126 enum ieee80211_self_protected_actioncode ftype;
1127 u64 changed = 0;
1128 u8 ie_len = elems->peering_len;
1129 u16 plid, llid = 0;
1130
1131 if (!elems->peering) {
1132 mpl_dbg(sdata,
1133 "Mesh plink: missing necessary peer link ie\n");
1134 return;
1135 }
1136
1137 if (elems->rsn_len &&
1138 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1139 mpl_dbg(sdata,
1140 "Mesh plink: can't establish link with secure peer\n");
1141 return;
1142 }
1143
1144 ftype = mgmt->u.action.u.self_prot.action_code;
1145 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1146 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1147 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1148 && ie_len != 8)) {
1149 mpl_dbg(sdata,
1150 "Mesh plink: incorrect plink ie length %d %d\n",
1151 ftype, ie_len);
1152 return;
1153 }
1154
1155 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1156 (!elems->mesh_id || !elems->mesh_config)) {
1157 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1158 return;
1159 }
1160 /* Note the lines below are correct, the llid in the frame is the plid
1161 * from the point of view of this host.
1162 */
1163 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1164 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1165 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1166 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1167
1168 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1169 rcu_read_lock();
1170
1171 sta = sta_info_get(sdata, mgmt->sa);
1172
1173 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1174 !rssi_threshold_check(sdata, sta)) {
1175 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1176 mgmt->sa);
1177 goto unlock_rcu;
1178 }
1179
1180 /* Now we will figure out the appropriate event... */
1181 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1182
1183 if (event == OPN_ACPT) {
1184 rcu_read_unlock();
1185 /* allocate sta entry if necessary and update info */
1186 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
1187 if (!sta) {
1188 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1189 goto unlock_rcu;
1190 }
1191 sta->mesh->plid = plid;
1192 } else if (!sta && event == OPN_RJCT) {
1193 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1194 mgmt->sa, 0, plid,
1195 WLAN_REASON_MESH_CONFIG);
1196 goto unlock_rcu;
1197 } else if (!sta || event == PLINK_UNDEFINED) {
1198 /* something went wrong */
1199 goto unlock_rcu;
1200 }
1201
1202 if (event == CNF_ACPT) {
1203 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1204 if (!sta->mesh->plid)
1205 sta->mesh->plid = plid;
1206
1207 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1208 }
1209
1210 changed |= mesh_plink_fsm(sdata, sta, event);
1211
1212unlock_rcu:
1213 rcu_read_unlock();
1214
1215 if (changed)
1216 ieee80211_mbss_info_change_notify(sdata, changed);
1217}
1218
1219void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1220 struct ieee80211_mgmt *mgmt, size_t len,
1221 struct ieee80211_rx_status *rx_status)
1222{
1223 struct ieee802_11_elems *elems;
1224 size_t baselen;
1225 u8 *baseaddr;
1226
1227 /* need action_code, aux */
1228 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1229 return;
1230
1231 if (sdata->u.mesh.user_mpm)
1232 /* userspace must register for these */
1233 return;
1234
1235 if (is_multicast_ether_addr(mgmt->da)) {
1236 mpl_dbg(sdata,
1237 "Mesh plink: ignore frame from multicast address\n");
1238 return;
1239 }
1240
1241 baseaddr = mgmt->u.action.u.self_prot.variable;
1242 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1243 if (mgmt->u.action.u.self_prot.action_code ==
1244 WLAN_SP_MESH_PEERING_CONFIRM) {
1245 baseaddr += 4;
1246 baselen += 4;
1247
1248 if (baselen > len)
1249 return;
1250 }
1251 elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL);
1252 if (elems) {
1253 mesh_process_plink_frame(sdata, mgmt, elems, rx_status);
1254 kfree(elems);
1255 }
1256}
Linux 6.x block layer and io_uring tree(s)