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Merge tag 'perf-tools-fixes-for-v6.4-1-2023-05-20' of git://git.kernel.org/pub/scm...
[linux-block.git] / net / mac80211 / mesh_plink.c
CommitLineData
d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
c3896d2c 2/*
264d9b7d 3 * Copyright (c) 2008, 2009 open80211s Ltd.
b4f85443 4 * Copyright (C) 2019, 2021-2022 Intel Corporation
c3896d2c 5 * Author: Luis Carlos Cobo <luisca@cozybit.com>
c3896d2c 6 */
5a0e3ad6 7#include <linux/gfp.h>
902acc78
JB		 8#include <linux/kernel.h>
9#include <linux/random.h>
b2d09103
IM		 10#include <linux/rculist.h>
11
c3896d2c 12#include "ieee80211_i.h"
2c8dccc7 13#include "rate.h"
c3896d2c 14#include "mesh.h"
c3896d2c 15
a69bd8e6 16#define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
8db09850
TP		 17#define PLINK_GET_LLID(p) (p + 2)
18#define PLINK_GET_PLID(p) (p + 4)
c3896d2c 19
433f5bc1 20#define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
cc57ac53 21 jiffies + msecs_to_jiffies(t)))
c3896d2c 22
c3896d2c
LCC		 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
95e48add
TP		 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
36c9bb29
BC		 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 ||
e5a9f8d0 63 (sta &&
046d2e7c
S		 64 (s8)-ewma_signal_read(&sta->deflink.rx_stats_avg.signal) >
65 rssi_threshold);
36c9bb29
BC		 66}
67
c3896d2c
LCC		 68/**
69 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
70 *
23c7a29c 71 * @sta: mesh peer link to restart
c3896d2c 72 *
433f5bc1 73 * Locking: this function must be called holding sta->mesh->plink_lock
c3896d2c
LCC		 74 */
75static inline void mesh_plink_fsm_restart(struct sta_info *sta)
76{
433f5bc1
JB		 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;
c3896d2c
LCC		 81}
82
3b144658
TP		 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;
21a8e9dd 96 struct ieee80211_supported_band *sband;
3b144658
TP		 97 struct sta_info *sta;
98 u32 erp_rates = 0, changed = 0;
99 int i;
100 bool short_slot = false;
101
21a8e9dd
MSS		 102 sband = ieee80211_get_sband(sdata);
103 if (!sband)
104 return changed;
105
106 if (sband->band == NL80211_BAND_5GHZ) {
3b144658
TP		 107 /* (IEEE 802.11-2012 19.4.5) */
108 short_slot = true;
109 goto out;
21a8e9dd 110 } else if (sband->band != NL80211_BAND_2GHZ) {
3b144658 111 goto out;
21a8e9dd 112 }
3b144658
TP		 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 ||
433f5bc1 124 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
3b144658
TP		 125 continue;
126
127 short_slot = false;
046d2e7c 128 if (erp_rates & sta->sta.deflink.supp_rates[sband->band])
3b144658
TP		 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
2c53040f 145/**
cbf9322e 146 * mesh_set_ht_prot_mode - set correct HT protection mode
21439b65 147 * @sdata: the (mesh) interface to handle
57aac7c5 148 *
cbf9322e
AN		 149 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
150 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
151 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
152 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
ab4040df 153 * is selected if all peers in our 20/40MHz MBSS support HT and at least one
cbf9322e 154 * HT20 peer is present. Otherwise no-protection mode is selected.
57aac7c5
AN		 155 */
156static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
157{
158 struct ieee80211_local *local = sdata->local;
159 struct sta_info *sta;
57aac7c5
AN		 160 u16 ht_opmode;
161 bool non_ht_sta = false, ht20_sta = false;
162
0418a445
SW		 163 switch (sdata->vif.bss_conf.chandef.width) {
164 case NL80211_CHAN_WIDTH_20_NOHT:
165 case NL80211_CHAN_WIDTH_5:
166 case NL80211_CHAN_WIDTH_10:
57aac7c5 167 return 0;
0418a445
SW		 168 default:
169 break;
170 }
57aac7c5
AN		 171
172 rcu_read_lock();
173 list_for_each_entry_rcu(sta, &local->sta_list, list) {
cbf9322e 174 if (sdata != sta->sdata ||
433f5bc1 175 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
cbf9322e
AN		 176 continue;
177
046d2e7c 178 if (sta->sta.deflink.bandwidth > IEEE80211_STA_RX_BW_20)
52ac8c48
TP		 179 continue;
180
046d2e7c 181 if (!sta->sta.deflink.ht_cap.ht_supported) {
52ac8c48
TP		 182 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
183 sta->sta.addr);
cbf9322e 184 non_ht_sta = true;
cbf9322e 185 break;
57aac7c5 186 }
52ac8c48
TP		 187
188 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
189 ht20_sta = true;
57aac7c5 190 }
57aac7c5
AN		 191 rcu_read_unlock();
192
193 if (non_ht_sta)
194 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
466f310d 195 else if (ht20_sta &&
4bf88530 196 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
57aac7c5
AN		 197 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
198 else
199 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
200
52ac8c48
TP		 201 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
202 return 0;
57aac7c5 203
52ac8c48
TP		 204 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
205 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
206 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
207 return BSS_CHANGED_HT;
57aac7c5
AN		 208}
209
f698d856 210static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
a69bd8e6 211 struct sta_info *sta,
bf7cd94d 212 enum ieee80211_self_protected_actioncode action,
6f101ef0 213 u8 *da, u16 llid, u16 plid, u16 reason)
bf7cd94d 214{
f698d856 215 struct ieee80211_local *local = sdata->local;
3b69a9c5 216 struct sk_buff *skb;
e7570dfb 217 struct ieee80211_tx_info *info;
c3896d2c
LCC		 218 struct ieee80211_mgmt *mgmt;
219 bool include_plid = false;
8db09850 220 u16 peering_proto = 0;
3b69a9c5 221 u8 *pos, ie_len = 4;
df1875c4 222 u8 ie_len_he_cap, ie_len_eht_cap;
4c121fd6 223 int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
f609a43d 224 int err = -ENOMEM;
3b69a9c5 225
60ad72da
SE		 226 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
227 NL80211_IFTYPE_MESH_POINT);
df1875c4
RL		 228 ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata,
229 NL80211_IFTYPE_MESH_POINT);
65e8b0cc 230 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 231 hdr_len +
232 2 + /* capability info */
233 2 + /* AID */
234 2 + 8 + /* supported rates */
235 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
236 2 + sdata->u.mesh.mesh_id_len +
237 2 + sizeof(struct ieee80211_meshconf_ie) +
176f3608 238 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 239 2 + sizeof(struct ieee80211_ht_operation) +
c85fb53c
BC		 240 2 + sizeof(struct ieee80211_vht_cap) +
241 2 + sizeof(struct ieee80211_vht_operation) +
60ad72da
SE		 242 ie_len_he_cap +
243 2 + 1 + sizeof(struct ieee80211_he_operation) +
d1b7524b 244 sizeof(struct ieee80211_he_6ghz_oper) +
24a2042c 245 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
df1875c4
RL		 246 ie_len_eht_cap +
247 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
248 offsetof(struct ieee80211_eht_operation_info, optional) +
3b69a9c5
TP		 249 2 + 8 + /* peering IE */
250 sdata->u.mesh.ie_len);
c3896d2c 251 if (!skb)
87d84c45 252 return err;
e7570dfb 253 info = IEEE80211_SKB_CB(skb);
65e8b0cc 254 skb_reserve(skb, local->tx_headroom);
b080db58 255 mgmt = skb_put_zero(skb, hdr_len);
e7827a70
HH		 256 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
257 IEEE80211_STYPE_ACTION);
c3896d2c 258 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 259 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 260 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 261 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
262 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 263
8db09850 264 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
21a8e9dd
MSS		 265 struct ieee80211_supported_band *sband;
266 enum nl80211_band band;
267
268 sband = ieee80211_get_sband(sdata);
269 if (!sband) {
270 err = -EINVAL;
271 goto free;
272 }
273 band = sband->band;
55de908a 274
8db09850 275 /* capability info */
e45a79da 276 pos = skb_put_zero(skb, 2);
54ef656b 277 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 278 /* AID */
279 pos = skb_put(skb, 2);
a69bd8e6 280 put_unaligned_le16(sta->sta.aid, pos);
c3896d2c 281 }
55de908a
JB		 282 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
283 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 284 mesh_add_rsn_ie(sdata, skb) ||
285 mesh_add_meshid_ie(sdata, skb) ||
286 mesh_add_meshconf_ie(sdata, skb))
f609a43d 287 goto free;
8db09850 288 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 289 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 290 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 291 goto free;
c3896d2c
LCC		 292 }
293
8db09850 294 /* Add Mesh Peering Management element */
c3896d2c 295 switch (action) {
54ef656b 296 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 297 break;
54ef656b 298 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 299 ie_len += 2;
c3896d2c
LCC		 300 include_plid = true;
301 break;
54ef656b 302 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 303 if (plid) {
304 ie_len += 2;
c3896d2c
LCC		 305 include_plid = true;
306 }
8db09850 307 ie_len += 2; /* reason code */
c3896d2c 308 break;
8db09850 309 default:
f609a43d
TP		 310 err = -EINVAL;
311 goto free;
c3896d2c
LCC		 312 }
313
8db09850 314 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 315 goto free;
8db09850 316
c3896d2c 317 pos = skb_put(skb, 2 + ie_len);
8db09850 318 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 319 *pos++ = ie_len;
8db09850
TP		 320 memcpy(pos, &peering_proto, 2);
321 pos += 2;
6f101ef0 322 put_unaligned_le16(llid, pos);
8db09850 323 pos += 2;
c3896d2c 324 if (include_plid) {
6f101ef0 325 put_unaligned_le16(plid, pos);
8db09850 326 pos += 2;
c3896d2c 327 }
54ef656b 328 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 329 put_unaligned_le16(reason, pos);
8db09850 330 pos += 2;
c3896d2c 331 }
176f3608
TP		 332
333 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d 334 if (mesh_add_ht_cap_ie(sdata, skb) ||
c85fb53c
BC		 335 mesh_add_ht_oper_ie(sdata, skb) ||
336 mesh_add_vht_cap_ie(sdata, skb) ||
60ad72da
SE		 337 mesh_add_vht_oper_ie(sdata, skb) ||
338 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
24a2042c 339 mesh_add_he_oper_ie(sdata, skb) ||
df1875c4
RL		 340 mesh_add_he_6ghz_cap_ie(sdata, skb) ||
341 mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
342 mesh_add_eht_oper_ie(sdata, skb))
f609a43d 343 goto free;
176f3608
TP		 344 }
345
bf7cd94d 346 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 347 goto free;
c3896d2c 348
62ae67be 349 ieee80211_tx_skb(sdata, skb);
c3896d2c 350 return 0;
f609a43d
TP		 351free:
352 kfree_skb(skb);
353 return err;
c3896d2c
LCC		 354}
355
fa87a656
BC		 356/**
357 * __mesh_plink_deactivate - deactivate mesh peer link
358 *
359 * @sta: mesh peer link to deactivate
360 *
e596af82
BC		 361 * Mesh paths with this peer as next hop should be flushed
362 * by the caller outside of plink_lock.
363 *
fa87a656
BC		 364 * Returns beacon changed flag if the beacon content changed.
365 *
366 * Locking: the caller must hold sta->mesh->plink_lock
367 */
368static u32 __mesh_plink_deactivate(struct sta_info *sta)
369{
370 struct ieee80211_sub_if_data *sdata = sta->sdata;
371 u32 changed = 0;
372
373 lockdep_assert_held(&sta->mesh->plink_lock);
374
375 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
376 changed = mesh_plink_dec_estab_count(sdata);
377 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
fa87a656
BC		 378
379 ieee80211_mps_sta_status_update(sta);
380 changed |= ieee80211_mps_set_sta_local_pm(sta,
381 NL80211_MESH_POWER_UNKNOWN);
382
383 return changed;
384}
385
386/**
387 * mesh_plink_deactivate - deactivate mesh peer link
388 *
389 * @sta: mesh peer link to deactivate
390 *
391 * All mesh paths with this peer as next hop will be flushed
392 */
393u32 mesh_plink_deactivate(struct sta_info *sta)
394{
395 struct ieee80211_sub_if_data *sdata = sta->sdata;
396 u32 changed;
397
398 spin_lock_bh(&sta->mesh->plink_lock);
399 changed = __mesh_plink_deactivate(sta);
efc401f4
BC		 400
401 if (!sdata->u.mesh.user_mpm) {
402 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
403 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
404 sta->sta.addr, sta->mesh->llid,
405 sta->mesh->plid, sta->mesh->reason);
406 }
fa87a656 407 spin_unlock_bh(&sta->mesh->plink_lock);
efc401f4
BC		 408 if (!sdata->u.mesh.user_mpm)
409 del_timer_sync(&sta->mesh->plink_timer);
e596af82 410 mesh_path_flush_by_nexthop(sta);
fa87a656 411
efc401f4
BC		 412 /* make sure no readers can access nexthop sta from here on */
413 synchronize_net();
414
fa87a656
BC		 415 return changed;
416}
417
296fcba3
TP		 418static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
419 struct sta_info *sta,
1d6741d8 420 struct ieee802_11_elems *elems)
c3896d2c 421{
f698d856 422 struct ieee80211_local *local = sdata->local;
54ab1ffb 423 struct ieee80211_supported_band *sband;
f68d776a 424 u32 rates, basic_rates = 0, changed = 0;
046d2e7c 425 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
c3896d2c 426
21a8e9dd
MSS		 427 sband = ieee80211_get_sband(sdata);
428 if (!sband)
429 return;
430
431 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
432 &basic_rates);
d0709a65 433
433f5bc1 434 spin_lock_bh(&sta->mesh->plink_lock);
046d2e7c 435 sta->deflink.rx_stats.last_rx = jiffies;
296fcba3
TP		 436
437 /* rates and capabilities don't change during peering */
433f5bc1
JB		 438 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
439 sta->mesh->processed_beacon)
296fcba3 440 goto out;
433f5bc1 441 sta->mesh->processed_beacon = true;
bae35d92 442
046d2e7c 443 if (sta->sta.deflink.supp_rates[sband->band] != rates)
f68d776a 444 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
046d2e7c 445 sta->sta.deflink.supp_rates[sband->band] = rates;
54ab1ffb 446
52ac8c48 447 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
c71420db
JB		 448 elems->ht_cap_elem,
449 &sta->deflink))
52ac8c48 450 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 451
c85fb53c 452 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
c71420db
JB		 453 elems->vht_cap_elem,
454 &sta->deflink);
c85fb53c 455
60ad72da 456 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
1bb9a8a4
JB		 457 elems->he_cap_len,
458 elems->he_6ghz_capa,
c71420db 459 &sta->deflink);
60ad72da 460
df1875c4
RL		 461 ieee80211_eht_cap_ie_to_sta_eht_cap(sdata, sband, elems->he_cap,
462 elems->he_cap_len,
463 elems->eht_cap, elems->eht_cap_len,
464 &sta->deflink);
465
046d2e7c 466 if (bw != sta->sta.deflink.bandwidth)
abcff6ef
JD		 467 changed |= IEEE80211_RC_BW_CHANGED;
468
52ac8c48
TP		 469 /* HT peer is operating 20MHz-only */
470 if (elems->ht_operation &&
471 !(elems->ht_operation->ht_param &
472 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
046d2e7c 473 if (sta->sta.deflink.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 474 changed |= IEEE80211_RC_BW_CHANGED;
046d2e7c 475 sta->sta.deflink.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 476 }
c7d25828 477
1d6741d8 478 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
59cf1d65 479 rate_control_rate_init(sta);
f68d776a 480 else
b4f85443 481 rate_control_rate_update(local, sband, sta, 0, changed);
296fcba3 482out:
433f5bc1 483 spin_unlock_bh(&sta->mesh->plink_lock);
296fcba3
TP		 484}
485
0e0060fc
BC		 486static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
487{
488 struct sta_info *sta;
489 unsigned long *aid_map;
490 int aid;
491
37babce9 492 aid_map = bitmap_zalloc(IEEE80211_MAX_AID + 1, GFP_KERNEL);
0e0060fc
BC		 493 if (!aid_map)
494 return -ENOMEM;
495
496 /* reserve aid 0 for mcast indication */
497 __set_bit(0, aid_map);
498
499 rcu_read_lock();
500 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
501 __set_bit(sta->sta.aid, aid_map);
502 rcu_read_unlock();
503
504 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
37babce9 505 bitmap_free(aid_map);
0e0060fc
BC		 506
507 if (aid > IEEE80211_MAX_AID)
508 return -ENOBUFS;
509
510 return aid;
511}
512
296fcba3
TP		 513static struct sta_info *
514__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
515{
516 struct sta_info *sta;
0e0060fc 517 int aid;
54ab1ffb 518
296fcba3 519 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 520 return NULL;
521
0e0060fc
BC		 522 aid = mesh_allocate_aid(sdata);
523 if (aid < 0)
524 return NULL;
525
f36fe0a2 526 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
296fcba3
TP		 527 if (!sta)
528 return NULL;
529
433f5bc1 530 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 531 sta->sta.wme = true;
0e0060fc 532 sta->sta.aid = aid;
296fcba3
TP		 533
534 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
535 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
536 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
537
296fcba3
TP		 538 return sta;
539}
540
541static struct sta_info *
542mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
ecbc12ad
BC		 543 struct ieee802_11_elems *elems,
544 struct ieee80211_rx_status *rx_status)
296fcba3
TP		 545{
546 struct sta_info *sta = NULL;
547
a6dad6a2
TP		 548 /* Userspace handles station allocation */
549 if (sdata->u.mesh.user_mpm ||
11197d00
MH		 550 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
551 if (mesh_peer_accepts_plinks(elems) &&
ecbc12ad
BC		 552 mesh_plink_availables(sdata)) {
553 int sig = 0;
554
555 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
556 sig = rx_status->signal;
557
11197d00
MH		 558 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
559 elems->ie_start,
560 elems->total_len,
ecbc12ad
BC		 561 sig, GFP_KERNEL);
562 }
11197d00 563 } else
296fcba3
TP		 564 sta = __mesh_sta_info_alloc(sdata, addr);
565
54ab1ffb
TP		 566 return sta;
567}
568
296fcba3
TP		 569/*
570 * mesh_sta_info_get - return mesh sta info entry for @addr.
571 *
572 * @sdata: local meshif
573 * @addr: peer's address
574 * @elems: IEs from beacon or mesh peering frame.
ecbc12ad 575 * @rx_status: rx status for the frame for signal reporting
296fcba3
TP		 576 *
577 * Return existing or newly allocated sta_info under RCU read lock.
578 * (re)initialize with given IEs.
579 */
580static struct sta_info *
581mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
ecbc12ad
BC		 582 u8 *addr, struct ieee802_11_elems *elems,
583 struct ieee80211_rx_status *rx_status) __acquires(RCU)
296fcba3
TP		 584{
585 struct sta_info *sta = NULL;
586
587 rcu_read_lock();
588 sta = sta_info_get(sdata, addr);
589 if (sta) {
1d6741d8 590 mesh_sta_info_init(sdata, sta, elems);
296fcba3
TP		 591 } else {
592 rcu_read_unlock();
593 /* can't run atomic */
ecbc12ad 594 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
296fcba3
TP		 595 if (!sta) {
596 rcu_read_lock();
597 return NULL;
598 }
599
1d6741d8 600 mesh_sta_info_init(sdata, sta, elems);
3b4797bc 601
296fcba3
TP		 602 if (sta_info_insert_rcu(sta))
603 return NULL;
604 }
605
606 return sta;
607}
608
609/*
610 * mesh_neighbour_update - update or initialize new mesh neighbor.
611 *
612 * @sdata: local meshif
613 * @addr: peer's address
614 * @elems: IEs from beacon or mesh peering frame
ecbc12ad 615 * @rx_status: rx status for the frame for signal reporting
296fcba3
TP		 616 *
617 * Initiates peering if appropriate.
618 */
f743ff49
TP		 619void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
620 u8 *hw_addr,
ecbc12ad
BC		 621 struct ieee802_11_elems *elems,
622 struct ieee80211_rx_status *rx_status)
54ab1ffb
TP		 623{
624 struct sta_info *sta;
39886b61 625 u32 changed = 0;
54ab1ffb 626
ecbc12ad 627 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
54ab1ffb
TP		 628 if (!sta)
629 goto out;
630
dbdaee7a
BC		 631 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
632 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
633
1570ca59 634 if (mesh_peer_accepts_plinks(elems) &&
433f5bc1 635 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
54ab1ffb
TP		 636 sdata->u.mesh.accepting_plinks &&
637 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 638 rssi_threshold_check(sdata, sta))
39886b61 639 changed = mesh_plink_open(sta);
c3896d2c 640
3f52b7e3 641 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 642out:
d0709a65 643 rcu_read_unlock();
2b5e1967 644 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 645}
646
4c02d62f 647void mesh_plink_timer(struct timer_list *t)
c3896d2c 648{
4c02d62f 649 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
c3896d2c 650 struct sta_info *sta;
6f101ef0 651 u16 reason = 0;
c3896d2c 652 struct ieee80211_sub_if_data *sdata;
453e66f2 653 struct mesh_config *mshcfg;
4efec451 654 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 655
d0709a65
JB		 656 /*
657 * This STA is valid because sta_info_destroy() will
658 * del_timer_sync() this timer after having made sure
659 * it cannot be readded (by deleting the plink.)
660 */
4c02d62f 661 sta = mesh->plink_sta;
c3896d2c 662
690205f1 663 if (sta->sdata->local->quiescing)
5bb644a0 664 return;
5bb644a0 665
433f5bc1 666 spin_lock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 667
668 /* If a timer fires just before a state transition on another CPU,
669 * we may have already extended the timeout and changed state by the
670 * time we've acquired the lock and arrived here. In that case,
671 * skip this timer and wait for the new one.
672 */
433f5bc1 673 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
2b470c39
BC		 674 mpl_dbg(sta->sdata,
675 "Ignoring timer for %pM in state %s (timer adjusted)",
433f5bc1
JB		 676 sta->sta.addr, mplstates[sta->mesh->plink_state]);
677 spin_unlock_bh(&sta->mesh->plink_lock);
c3896d2c
LCC		 678 return;
679 }
2b470c39
BC		 680
681 /* del_timer() and handler may race when entering these states */
433f5bc1
JB		 682 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
683 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
2b470c39
BC		 684 mpl_dbg(sta->sdata,
685 "Ignoring timer for %pM in state %s (timer deleted)",
433f5bc1
JB		 686 sta->sta.addr, mplstates[sta->mesh->plink_state]);
687 spin_unlock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 688 return;
689 }
690
bdcbd8e0 691 mpl_dbg(sta->sdata,
3088f7d2 692 "Mesh plink timer for %pM fired on state %s\n",
433f5bc1 693 sta->sta.addr, mplstates[sta->mesh->plink_state]);
d0709a65 694 sdata = sta->sdata;
453e66f2 695 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c 696
433f5bc1 697 switch (sta->mesh->plink_state) {
57cf8043
JC		 698 case NL80211_PLINK_OPN_RCVD:
699 case NL80211_PLINK_OPN_SNT:
c3896d2c 700 /* retry timer */
433f5bc1 701 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 702 u32 rand;
bdcbd8e0
JB		 703 mpl_dbg(sta->sdata,
704 "Mesh plink for %pM (retry, timeout): %d %d\n",
433f5bc1
JB		 705 sta->sta.addr, sta->mesh->plink_retries,
706 sta->mesh->plink_timeout);
c3896d2c 707 get_random_bytes(&rand, sizeof(u32));
433f5bc1
JB		 708 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
709 rand % sta->mesh->plink_timeout;
710 ++sta->mesh->plink_retries;
711 mod_plink_timer(sta, sta->mesh->plink_timeout);
4efec451 712 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 713 break;
714 }
6f101ef0 715 reason = WLAN_REASON_MESH_MAX_RETRIES;
fc0561dc 716 fallthrough;
57cf8043 717 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 718 /* confirm timer */
719 if (!reason)
6f101ef0 720 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
433f5bc1 721 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
453e66f2 722 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 723 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 724 break;
57cf8043 725 case NL80211_PLINK_HOLDING:
c3896d2c 726 /* holding timer */
433f5bc1 727 del_timer(&sta->mesh->plink_timer);
c3896d2c 728 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 729 break;
730 default:
c3896d2c
LCC		 731 break;
732 }
433f5bc1 733 spin_unlock_bh(&sta->mesh->plink_lock);
4efec451 734 if (action)
a69bd8e6 735 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1 736 sta->mesh->llid, sta->mesh->plid, reason);
c3896d2c
LCC		 737}
738
0df2f6c1 739static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 740{
433f5bc1 741 sta->mesh->plink_timeout = timeout;
4c02d62f 742 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
c3896d2c
LCC		 743}
744
204d1304 745static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 746 u16 llid)
204d1304
TP		 747{
748 struct ieee80211_local *local = sdata->local;
749 bool in_use = false;
750 struct sta_info *sta;
751
752 rcu_read_lock();
753 list_for_each_entry_rcu(sta, &local->sta_list, list) {
520c75dc
MS		 754 if (sdata != sta->sdata)
755 continue;
756
433f5bc1 757 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
204d1304
TP		 758 in_use = true;
759 break;
760 }
761 }
762 rcu_read_unlock();
763
764 return in_use;
765}
766
6f101ef0 767static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 768{
769 u16 llid;
770
771 do {
772 get_random_bytes(&llid, sizeof(llid));
6f101ef0 773 } while (llid_in_use(sdata, llid));
204d1304 774
6f101ef0 775 return llid;
204d1304
TP		 776}
777
39886b61 778u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 779{
d0709a65 780 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 781 u32 changed;
c3896d2c 782
c2c98fde 783 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 784 return 0;
53e80511 785
433f5bc1
JB		 786 spin_lock_bh(&sta->mesh->plink_lock);
787 sta->mesh->llid = mesh_get_new_llid(sdata);
788 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
789 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
790 spin_unlock_bh(&sta->mesh->plink_lock);
39886b61 791 return 0;
c3896d2c 792 }
433f5bc1 793 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 794 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
433f5bc1 795 spin_unlock_bh(&sta->mesh->plink_lock);
bdcbd8e0
JB		 796 mpl_dbg(sdata,
797 "Mesh plink: starting establishment with %pM\n",
0c68ae26 798 sta->sta.addr);
c3896d2c 799
3f52b7e3 800 /* set the non-peer mode to active during peering */
39886b61 801 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 802
a69bd8e6 803 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
433f5bc1 804 sta->sta.addr, sta->mesh->llid, 0, 0);
39886b61 805 return changed;
c3896d2c
LCC		 806}
807
39886b61 808u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 809{
df323818 810 u32 changed;
c9370197 811
433f5bc1 812 spin_lock_bh(&sta->mesh->plink_lock);
df323818 813 changed = __mesh_plink_deactivate(sta);
433f5bc1
JB		 814 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
815 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82 816 mesh_path_flush_by_nexthop(sta);
c9370197 817
39886b61 818 return changed;
c3896d2c
LCC		 819}
820
e76d67f0
BC		 821static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
822 struct sta_info *sta,
823 enum plink_event event)
824{
825 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
6f101ef0
CYY		 826 u16 reason = (event == CLS_ACPT) ?
827 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0 828
433f5bc1
JB		 829 sta->mesh->reason = reason;
830 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
272a9e26 831 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 832}
833
834static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
835 struct sta_info *sta)
836{
837 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
838 u32 changed = 0;
839
433f5bc1
JB		 840 del_timer(&sta->mesh->plink_timer);
841 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
e76d67f0
BC		 842 changed |= mesh_plink_inc_estab_count(sdata);
843 changed |= mesh_set_ht_prot_mode(sdata);
844 changed |= mesh_set_short_slot_time(sdata);
845 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
846 ieee80211_mps_sta_status_update(sta);
847 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
848 return changed;
849}
850
c7e67811
TP		 851/**
852 * mesh_plink_fsm - step @sta MPM based on @event
853 *
854 * @sdata: interface
855 * @sta: mesh neighbor
856 * @event: peering event
857 *
858 * Return: changed MBSS flags
859 */
860static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
861 struct sta_info *sta, enum plink_event event)
862{
863 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
864 enum ieee80211_self_protected_actioncode action = 0;
865 u32 changed = 0;
e596af82 866 bool flush = false;
c7e67811
TP		 867
868 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
433f5bc1 869 mplstates[sta->mesh->plink_state], mplevents[event]);
c7e67811 870
433f5bc1
JB		 871 spin_lock_bh(&sta->mesh->plink_lock);
872 switch (sta->mesh->plink_state) {
c7e67811
TP		 873 case NL80211_PLINK_LISTEN:
874 switch (event) {
875 case CLS_ACPT:
876 mesh_plink_fsm_restart(sta);
877 break;
878 case OPN_ACPT:
433f5bc1
JB		 879 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
880 sta->mesh->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 881 mesh_plink_timer_set(sta,
882 mshcfg->dot11MeshRetryTimeout);
883
884 /* set the non-peer mode to active during peering */
885 changed |= ieee80211_mps_local_status_update(sdata);
886 action = WLAN_SP_MESH_PEERING_OPEN;
887 break;
888 default:
889 break;
890 }
891 break;
892 case NL80211_PLINK_OPN_SNT:
893 switch (event) {
894 case OPN_RJCT:
895 case CNF_RJCT:
896 case CLS_ACPT:
897 mesh_plink_close(sdata, sta, event);
898 action = WLAN_SP_MESH_PEERING_CLOSE;
899 break;
900 case OPN_ACPT:
901 /* retry timer is left untouched */
433f5bc1 902 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
c7e67811
TP		 903 action = WLAN_SP_MESH_PEERING_CONFIRM;
904 break;
905 case CNF_ACPT:
433f5bc1 906 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 907 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 908 break;
909 default:
910 break;
911 }
912 break;
913 case NL80211_PLINK_OPN_RCVD:
914 switch (event) {
915 case OPN_RJCT:
916 case CNF_RJCT:
917 case CLS_ACPT:
918 mesh_plink_close(sdata, sta, event);
919 action = WLAN_SP_MESH_PEERING_CLOSE;
920 break;
921 case OPN_ACPT:
922 action = WLAN_SP_MESH_PEERING_CONFIRM;
923 break;
924 case CNF_ACPT:
925 changed |= mesh_plink_establish(sdata, sta);
926 break;
927 default:
928 break;
929 }
930 break;
931 case NL80211_PLINK_CNF_RCVD:
932 switch (event) {
933 case OPN_RJCT:
934 case CNF_RJCT:
935 case CLS_ACPT:
936 mesh_plink_close(sdata, sta, event);
937 action = WLAN_SP_MESH_PEERING_CLOSE;
938 break;
939 case OPN_ACPT:
940 changed |= mesh_plink_establish(sdata, sta);
941 action = WLAN_SP_MESH_PEERING_CONFIRM;
942 break;
943 default:
944 break;
945 }
946 break;
947 case NL80211_PLINK_ESTAB:
948 switch (event) {
949 case CLS_ACPT:
950 changed |= __mesh_plink_deactivate(sta);
951 changed |= mesh_set_ht_prot_mode(sdata);
952 changed |= mesh_set_short_slot_time(sdata);
953 mesh_plink_close(sdata, sta, event);
954 action = WLAN_SP_MESH_PEERING_CLOSE;
e596af82 955 flush = true;
c7e67811
TP		 956 break;
957 case OPN_ACPT:
958 action = WLAN_SP_MESH_PEERING_CONFIRM;
959 break;
960 default:
961 break;
962 }
963 break;
964 case NL80211_PLINK_HOLDING:
965 switch (event) {
966 case CLS_ACPT:
433f5bc1 967 del_timer(&sta->mesh->plink_timer);
c7e67811
TP		 968 mesh_plink_fsm_restart(sta);
969 break;
970 case OPN_ACPT:
971 case CNF_ACPT:
972 case OPN_RJCT:
973 case CNF_RJCT:
974 action = WLAN_SP_MESH_PEERING_CLOSE;
975 break;
976 default:
977 break;
978 }
979 break;
980 default:
981 /* should not get here, PLINK_BLOCKED is dealt with at the
982 * beginning of the function
983 */
984 break;
985 }
433f5bc1 986 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82
BC		 987 if (flush)
988 mesh_path_flush_by_nexthop(sta);
c7e67811 989 if (action) {
a69bd8e6 990 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1
JB		 991 sta->mesh->llid, sta->mesh->plid,
992 sta->mesh->reason);
c7e67811
TP		 993
994 /* also send confirm in open case */
995 if (action == WLAN_SP_MESH_PEERING_OPEN) {
a69bd8e6 996 mesh_plink_frame_tx(sdata, sta,
c7e67811 997 WLAN_SP_MESH_PEERING_CONFIRM,
433f5bc1
JB		 998 sta->sta.addr, sta->mesh->llid,
999 sta->mesh->plid, 0);
c7e67811
TP		 1000 }
1001 }
1002
1003 return changed;
1004}
1005
c99a89ed
TP		 1006/*
1007 * mesh_plink_get_event - get correct MPM event
1008 *
1009 * @sdata: interface
1010 * @sta: peer, leave NULL if processing a frame from a new suitable peer
1011 * @elems: peering management IEs
1012 * @ftype: frame type
1013 * @llid: peer's peer link ID
1014 * @plid: peer's local link ID
1015 *
1016 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1017 * an error.
1018 */
1019static enum plink_event
1020mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1021 struct sta_info *sta,
1022 struct ieee802_11_elems *elems,
1023 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 1024 u16 llid, u16 plid)
c99a89ed
TP		 1025{
1026 enum plink_event event = PLINK_UNDEFINED;
1027 u8 ie_len = elems->peering_len;
1028 bool matches_local;
1029
1030 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1031 mesh_matches_local(sdata, elems));
1032
1033 /* deny open request from non-matching peer */
1034 if (!matches_local && !sta) {
1035 event = OPN_RJCT;
1036 goto out;
1037 }
1038
1039 if (!sta) {
1040 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1041 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1042 goto out;
1043 }
1044 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1045 if (!mesh_plink_free_count(sdata)) {
1046 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1047 goto out;
1048 }
b8631c00
SS		 1049
1050 /* new matching peer */
1051 event = OPN_ACPT;
1052 goto out;
c99a89ed
TP		 1053 } else {
1054 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1055 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1056 goto out;
1057 }
433f5bc1 1058 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
c99a89ed
TP		 1059 goto out;
1060 }
1061
c99a89ed
TP		 1062 switch (ftype) {
1063 case WLAN_SP_MESH_PEERING_OPEN:
1064 if (!matches_local)
1065 event = OPN_RJCT;
1066 if (!mesh_plink_free_count(sdata) ||
433f5bc1 1067 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1068 event = OPN_IGNR;
1069 else
1070 event = OPN_ACPT;
1071 break;
1072 case WLAN_SP_MESH_PEERING_CONFIRM:
1073 if (!matches_local)
1074 event = CNF_RJCT;
1075 if (!mesh_plink_free_count(sdata) ||
433f5bc1
JB		 1076 sta->mesh->llid != llid ||
1077 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1078 event = CNF_IGNR;
1079 else
1080 event = CNF_ACPT;
1081 break;
1082 case WLAN_SP_MESH_PEERING_CLOSE:
433f5bc1 1083 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
c99a89ed
TP		 1084 /* Do not check for llid or plid. This does not
1085 * follow the standard but since multiple plinks
1086 * per sta are not supported, it is necessary in
1087 * order to avoid a livelock when MP A sees an
1088 * establish peer link to MP B but MP B does not
1089 * see it. This can be caused by a timeout in
1090 * B's peer link establishment or B beign
1091 * restarted.
1092 */
1093 event = CLS_ACPT;
433f5bc1 1094 else if (sta->mesh->plid != plid)
c99a89ed 1095 event = CLS_IGNR;
433f5bc1 1096 else if (ie_len == 8 && sta->mesh->llid != llid)
c99a89ed
TP		 1097 event = CLS_IGNR;
1098 else
1099 event = CLS_ACPT;
1100 break;
1101 default:
1102 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1103 break;
1104 }
1105
1106out:
1107 return event;
1108}
1109
05a23ae9
TP		 1110static void
1111mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1112 struct ieee80211_mgmt *mgmt,
ecbc12ad
BC		 1113 struct ieee802_11_elems *elems,
1114 struct ieee80211_rx_status *rx_status)
c3896d2c 1115{
05a23ae9 1116
c3896d2c
LCC		 1117 struct sta_info *sta;
1118 enum plink_event event;
54ef656b 1119 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 1120 u32 changed = 0;
c99a89ed 1121 u8 ie_len = elems->peering_len;
6f101ef0 1122 u16 plid, llid = 0;
c3896d2c 1123
05a23ae9 1124 if (!elems->peering) {
bdcbd8e0
JB		 1125 mpl_dbg(sdata,
1126 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1127 return;
1128 }
bf7cd94d 1129
05a23ae9 1130 if (elems->rsn_len &&
bf7cd94d 1131 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1132 mpl_dbg(sdata,
1133 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1134 return;
1135 }
c3896d2c 1136
8db09850 1137 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1138 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1139 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1140 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1141 && ie_len != 8)) {
bdcbd8e0
JB		 1142 mpl_dbg(sdata,
1143 "Mesh plink: incorrect plink ie length %d %d\n",
1144 ftype, ie_len);
c3896d2c
LCC		 1145 return;
1146 }
1147
54ef656b 1148 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1149 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1150 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1151 return;
1152 }
1153 /* Note the lines below are correct, the llid in the frame is the plid
1154 * from the point of view of this host.
1155 */
f8134fed 1156 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1157 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1158 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1159 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1160
296fcba3 1161 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1162 rcu_read_lock();
1163
abe60632 1164 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1165
55335137 1166 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1167 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1168 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1169 mgmt->sa);
fc10302e 1170 goto unlock_rcu;
55335137
AN		 1171 }
1172
c3896d2c 1173 /* Now we will figure out the appropriate event... */
c99a89ed 1174 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1175
1176 if (event == OPN_ACPT) {
296fcba3 1177 rcu_read_unlock();
54ab1ffb 1178 /* allocate sta entry if necessary and update info */
ecbc12ad 1179 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
54ab1ffb 1180 if (!sta) {
bdcbd8e0 1181 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1182 goto unlock_rcu;
54ab1ffb 1183 }
433f5bc1 1184 sta->mesh->plid = plid;
c99a89ed 1185 } else if (!sta && event == OPN_RJCT) {
a69bd8e6 1186 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
c99a89ed 1187 mgmt->sa, 0, plid,
6f101ef0 1188 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1189 goto unlock_rcu;
1190 } else if (!sta || event == PLINK_UNDEFINED) {
1191 /* something went wrong */
1192 goto unlock_rcu;
c3896d2c
LCC		 1193 }
1194
a69bd8e6
BC		 1195 if (event == CNF_ACPT) {
1196 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
0e0060fc 1197 if (!sta->mesh->plid)
a69bd8e6 1198 sta->mesh->plid = plid;
a69bd8e6
BC		 1199
1200 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1201 }
6c6fa496 1202
c7e67811 1203 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1204
fc10302e 1205unlock_rcu:
d0709a65 1206 rcu_read_unlock();
57aac7c5 1207
ecccd072 1208 if (changed)
2b5e1967 1209 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1210}
05a23ae9
TP		 1211
1212void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1213 struct ieee80211_mgmt *mgmt, size_t len,
1214 struct ieee80211_rx_status *rx_status)
1215{
5d24828d 1216 struct ieee802_11_elems *elems;
05a23ae9
TP		 1217 size_t baselen;
1218 u8 *baseaddr;
1219
1220 /* need action_code, aux */
1221 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1222 return;
1223
1224 if (sdata->u.mesh.user_mpm)
1225 /* userspace must register for these */
1226 return;
1227
1228 if (is_multicast_ether_addr(mgmt->da)) {
1229 mpl_dbg(sdata,
1230 "Mesh plink: ignore frame from multicast address\n");
1231 return;
1232 }
1233
1234 baseaddr = mgmt->u.action.u.self_prot.variable;
1235 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1236 if (mgmt->u.action.u.self_prot.action_code ==
1237 WLAN_SP_MESH_PEERING_CONFIRM) {
1238 baseaddr += 4;
1239 baselen += 4;
b3e7de87
BC		 1240
1241 if (baselen > len)
1242 return;
05a23ae9 1243 }
38c6aa29 1244 elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL);
5d24828d
JB		 1245 mesh_process_plink_frame(sdata, mgmt, elems, rx_status);
1246 kfree(elems);
05a23ae9 1247}
Linux 6.x block layer and io_uring tree(s)