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Linux 6.10-rc3
[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.
90233160 4 * Copyright (C) 2019, 2021-2024 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 */
15ddba5f 93static u64 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
3b144658
TP		 94{
95 struct ieee80211_local *local = sdata->local;
21a8e9dd 96 struct ieee80211_supported_band *sband;
3b144658 97 struct sta_info *sta;
15ddba5f
A		 98 u32 erp_rates = 0;
99 u64 changed = 0;
3b144658
TP		 100 int i;
101 bool short_slot = false;
102
21a8e9dd
MSS		 103 sband = ieee80211_get_sband(sdata);
104 if (!sband)
105 return changed;
106
107 if (sband->band == NL80211_BAND_5GHZ) {
3b144658
TP		 108 /* (IEEE 802.11-2012 19.4.5) */
109 short_slot = true;
110 goto out;
21a8e9dd 111 } else if (sband->band != NL80211_BAND_2GHZ) {
3b144658 112 goto out;
21a8e9dd 113 }
3b144658
TP		 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 ||
433f5bc1 125 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
3b144658
TP		 126 continue;
127
128 short_slot = false;
046d2e7c 129 if (erp_rates & sta->sta.deflink.supp_rates[sband->band])
3b144658
TP		 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
2c53040f 146/**
cbf9322e 147 * mesh_set_ht_prot_mode - set correct HT protection mode
21439b65 148 * @sdata: the (mesh) interface to handle
57aac7c5 149 *
cbf9322e
AN		 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
ab4040df 154 * is selected if all peers in our 20/40MHz MBSS support HT and at least one
cbf9322e 155 * HT20 peer is present. Otherwise no-protection mode is selected.
c00de1c4
BB		 156 *
157 * Returns: BSS_CHANGED_HT or 0 for no change
57aac7c5 158 */
15ddba5f 159static u64 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
57aac7c5
AN		 160{
161 struct ieee80211_local *local = sdata->local;
162 struct sta_info *sta;
57aac7c5
AN		 163 u16 ht_opmode;
164 bool non_ht_sta = false, ht20_sta = false;
165
6092077a 166 switch (sdata->vif.bss_conf.chanreq.oper.width) {
0418a445
SW		 167 case NL80211_CHAN_WIDTH_20_NOHT:
168 case NL80211_CHAN_WIDTH_5:
169 case NL80211_CHAN_WIDTH_10:
57aac7c5 170 return 0;
0418a445
SW		 171 default:
172 break;
173 }
57aac7c5
AN		 174
175 rcu_read_lock();
176 list_for_each_entry_rcu(sta, &local->sta_list, list) {
cbf9322e 177 if (sdata != sta->sdata ||
433f5bc1 178 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
cbf9322e
AN		 179 continue;
180
046d2e7c 181 if (sta->sta.deflink.bandwidth > IEEE80211_STA_RX_BW_20)
52ac8c48
TP		 182 continue;
183
046d2e7c 184 if (!sta->sta.deflink.ht_cap.ht_supported) {
52ac8c48
TP		 185 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
186 sta->sta.addr);
cbf9322e 187 non_ht_sta = true;
cbf9322e 188 break;
57aac7c5 189 }
52ac8c48
TP		 190
191 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
192 ht20_sta = true;
57aac7c5 193 }
57aac7c5
AN		 194 rcu_read_unlock();
195
196 if (non_ht_sta)
197 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
466f310d 198 else if (ht20_sta &&
6092077a 199 sdata->vif.bss_conf.chanreq.oper.width > NL80211_CHAN_WIDTH_20)
57aac7c5
AN		 200 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
201 else
202 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
203
52ac8c48
TP		 204 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
205 return 0;
57aac7c5 206
52ac8c48
TP		 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;
57aac7c5
AN		 211}
212
f698d856 213static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
a69bd8e6 214 struct sta_info *sta,
bf7cd94d 215 enum ieee80211_self_protected_actioncode action,
6f101ef0 216 u8 *da, u16 llid, u16 plid, u16 reason)
bf7cd94d 217{
f698d856 218 struct ieee80211_local *local = sdata->local;
3b69a9c5 219 struct sk_buff *skb;
e7570dfb 220 struct ieee80211_tx_info *info;
c3896d2c
LCC		 221 struct ieee80211_mgmt *mgmt;
222 bool include_plid = false;
8db09850 223 u16 peering_proto = 0;
3b69a9c5 224 u8 *pos, ie_len = 4;
df1875c4 225 u8 ie_len_he_cap, ie_len_eht_cap;
4c121fd6 226 int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
f609a43d 227 int err = -ENOMEM;
3b69a9c5 228
90233160
JB		 229 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata);
230 ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata);
65e8b0cc 231 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 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) +
176f3608 239 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 240 2 + sizeof(struct ieee80211_ht_operation) +
c85fb53c
BC		 241 2 + sizeof(struct ieee80211_vht_cap) +
242 2 + sizeof(struct ieee80211_vht_operation) +
60ad72da
SE		 243 ie_len_he_cap +
244 2 + 1 + sizeof(struct ieee80211_he_operation) +
d1b7524b 245 sizeof(struct ieee80211_he_6ghz_oper) +
24a2042c 246 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
df1875c4
RL		 247 ie_len_eht_cap +
248 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
249 offsetof(struct ieee80211_eht_operation_info, optional) +
3b69a9c5
TP		 250 2 + 8 + /* peering IE */
251 sdata->u.mesh.ie_len);
c3896d2c 252 if (!skb)
87d84c45 253 return err;
e7570dfb 254 info = IEEE80211_SKB_CB(skb);
65e8b0cc 255 skb_reserve(skb, local->tx_headroom);
b080db58 256 mgmt = skb_put_zero(skb, hdr_len);
e7827a70
HH		 257 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
258 IEEE80211_STYPE_ACTION);
c3896d2c 259 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 260 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 261 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 262 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
263 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 264
8db09850 265 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
21a8e9dd 266 struct ieee80211_supported_band *sband;
147ceae2 267 u32 rate_flags, basic_rates;
21a8e9dd
MSS		 268
269 sband = ieee80211_get_sband(sdata);
270 if (!sband) {
271 err = -EINVAL;
272 goto free;
273 }
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 }
147ceae2
JB		 282
283 rate_flags =
284 ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chanreq.oper);
285 basic_rates = sdata->vif.bss_conf.basic_rates;
286
287 if (ieee80211_put_srates_elem(skb, sband, basic_rates,
288 rate_flags, 0,
289 WLAN_EID_SUPP_RATES) ||
290 ieee80211_put_srates_elem(skb, sband, basic_rates,
291 rate_flags, 0,
292 WLAN_EID_EXT_SUPP_RATES) ||
bf7cd94d
JB		 293 mesh_add_rsn_ie(sdata, skb) ||
294 mesh_add_meshid_ie(sdata, skb) ||
295 mesh_add_meshconf_ie(sdata, skb))
f609a43d 296 goto free;
8db09850 297 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 298 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 299 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 300 goto free;
c3896d2c
LCC		 301 }
302
8db09850 303 /* Add Mesh Peering Management element */
c3896d2c 304 switch (action) {
54ef656b 305 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 306 break;
54ef656b 307 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 308 ie_len += 2;
c3896d2c
LCC		 309 include_plid = true;
310 break;
54ef656b 311 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 312 if (plid) {
313 ie_len += 2;
c3896d2c
LCC		 314 include_plid = true;
315 }
8db09850 316 ie_len += 2; /* reason code */
c3896d2c 317 break;
8db09850 318 default:
f609a43d
TP		 319 err = -EINVAL;
320 goto free;
c3896d2c
LCC		 321 }
322
8db09850 323 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 324 goto free;
8db09850 325
c3896d2c 326 pos = skb_put(skb, 2 + ie_len);
8db09850 327 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 328 *pos++ = ie_len;
8db09850
TP		 329 memcpy(pos, &peering_proto, 2);
330 pos += 2;
6f101ef0 331 put_unaligned_le16(llid, pos);
8db09850 332 pos += 2;
c3896d2c 333 if (include_plid) {
6f101ef0 334 put_unaligned_le16(plid, pos);
8db09850 335 pos += 2;
c3896d2c 336 }
54ef656b 337 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 338 put_unaligned_le16(reason, pos);
8db09850 339 pos += 2;
c3896d2c 340 }
176f3608
TP		 341
342 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d 343 if (mesh_add_ht_cap_ie(sdata, skb) ||
c85fb53c
BC		 344 mesh_add_ht_oper_ie(sdata, skb) ||
345 mesh_add_vht_cap_ie(sdata, skb) ||
60ad72da
SE		 346 mesh_add_vht_oper_ie(sdata, skb) ||
347 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
24a2042c 348 mesh_add_he_oper_ie(sdata, skb) ||
df1875c4
RL		 349 mesh_add_he_6ghz_cap_ie(sdata, skb) ||
350 mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
351 mesh_add_eht_oper_ie(sdata, skb))
f609a43d 352 goto free;
176f3608
TP		 353 }
354
bf7cd94d 355 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 356 goto free;
c3896d2c 357
62ae67be 358 ieee80211_tx_skb(sdata, skb);
c3896d2c 359 return 0;
f609a43d
TP		 360free:
361 kfree_skb(skb);
362 return err;
c3896d2c
LCC		 363}
364
fa87a656
BC		 365/**
366 * __mesh_plink_deactivate - deactivate mesh peer link
367 *
368 * @sta: mesh peer link to deactivate
369 *
e596af82
BC		 370 * Mesh paths with this peer as next hop should be flushed
371 * by the caller outside of plink_lock.
372 *
c00de1c4 373 * Returns: beacon changed flag if the beacon content changed.
fa87a656
BC		 374 *
375 * Locking: the caller must hold sta->mesh->plink_lock
376 */
15ddba5f 377static u64 __mesh_plink_deactivate(struct sta_info *sta)
fa87a656
BC		 378{
379 struct ieee80211_sub_if_data *sdata = sta->sdata;
15ddba5f 380 u64 changed = 0;
fa87a656
BC		 381
382 lockdep_assert_held(&sta->mesh->plink_lock);
383
384 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
385 changed = mesh_plink_dec_estab_count(sdata);
386 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
fa87a656
BC		 387
388 ieee80211_mps_sta_status_update(sta);
389 changed |= ieee80211_mps_set_sta_local_pm(sta,
390 NL80211_MESH_POWER_UNKNOWN);
391
392 return changed;
393}
394
395/**
396 * mesh_plink_deactivate - deactivate mesh peer link
397 *
398 * @sta: mesh peer link to deactivate
399 *
400 * All mesh paths with this peer as next hop will be flushed
c00de1c4
BB		 401 *
402 * Returns: beacon changed flag if the beacon content changed.
fa87a656 403 */
15ddba5f 404u64 mesh_plink_deactivate(struct sta_info *sta)
fa87a656
BC		 405{
406 struct ieee80211_sub_if_data *sdata = sta->sdata;
15ddba5f 407 u64 changed;
fa87a656
BC		 408
409 spin_lock_bh(&sta->mesh->plink_lock);
410 changed = __mesh_plink_deactivate(sta);
efc401f4
BC		 411
412 if (!sdata->u.mesh.user_mpm) {
413 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
414 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
415 sta->sta.addr, sta->mesh->llid,
416 sta->mesh->plid, sta->mesh->reason);
417 }
fa87a656 418 spin_unlock_bh(&sta->mesh->plink_lock);
efc401f4
BC		 419 if (!sdata->u.mesh.user_mpm)
420 del_timer_sync(&sta->mesh->plink_timer);
e596af82 421 mesh_path_flush_by_nexthop(sta);
fa87a656 422
efc401f4
BC		 423 /* make sure no readers can access nexthop sta from here on */
424 synchronize_net();
425
fa87a656
BC		 426 return changed;
427}
428
296fcba3
TP		 429static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
430 struct sta_info *sta,
1d6741d8 431 struct ieee802_11_elems *elems)
c3896d2c 432{
f698d856 433 struct ieee80211_local *local = sdata->local;
54ab1ffb 434 struct ieee80211_supported_band *sband;
f68d776a 435 u32 rates, basic_rates = 0, changed = 0;
046d2e7c 436 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
c3896d2c 437
21a8e9dd
MSS		 438 sband = ieee80211_get_sband(sdata);
439 if (!sband)
440 return;
441
442 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
443 &basic_rates);
d0709a65 444
433f5bc1 445 spin_lock_bh(&sta->mesh->plink_lock);
046d2e7c 446 sta->deflink.rx_stats.last_rx = jiffies;
296fcba3
TP		 447
448 /* rates and capabilities don't change during peering */
433f5bc1
JB		 449 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
450 sta->mesh->processed_beacon)
296fcba3 451 goto out;
433f5bc1 452 sta->mesh->processed_beacon = true;
bae35d92 453
046d2e7c 454 if (sta->sta.deflink.supp_rates[sband->band] != rates)
f68d776a 455 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
046d2e7c 456 sta->sta.deflink.supp_rates[sband->band] = rates;
54ab1ffb 457
52ac8c48 458 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
c71420db
JB		 459 elems->ht_cap_elem,
460 &sta->deflink))
52ac8c48 461 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 462
c85fb53c 463 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
084cf2ae 464 elems->vht_cap_elem, NULL,
c71420db 465 &sta->deflink);
c85fb53c 466
60ad72da 467 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
1bb9a8a4
JB		 468 elems->he_cap_len,
469 elems->he_6ghz_capa,
c71420db 470 &sta->deflink);
60ad72da 471
df1875c4
RL		 472 ieee80211_eht_cap_ie_to_sta_eht_cap(sdata, sband, elems->he_cap,
473 elems->he_cap_len,
474 elems->eht_cap, elems->eht_cap_len,
475 &sta->deflink);
476
046d2e7c 477 if (bw != sta->sta.deflink.bandwidth)
abcff6ef
JD		 478 changed |= IEEE80211_RC_BW_CHANGED;
479
52ac8c48
TP		 480 /* HT peer is operating 20MHz-only */
481 if (elems->ht_operation &&
482 !(elems->ht_operation->ht_param &
483 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
046d2e7c 484 if (sta->sta.deflink.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 485 changed |= IEEE80211_RC_BW_CHANGED;
046d2e7c 486 sta->sta.deflink.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 487 }
c7d25828 488
1d6741d8 489 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
59cf1d65 490 rate_control_rate_init(sta);
f68d776a 491 else
b4f85443 492 rate_control_rate_update(local, sband, sta, 0, changed);
296fcba3 493out:
433f5bc1 494 spin_unlock_bh(&sta->mesh->plink_lock);
296fcba3
TP		 495}
496
0e0060fc
BC		 497static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
498{
499 struct sta_info *sta;
500 unsigned long *aid_map;
501 int aid;
502
37babce9 503 aid_map = bitmap_zalloc(IEEE80211_MAX_AID + 1, GFP_KERNEL);
0e0060fc
BC		 504 if (!aid_map)
505 return -ENOMEM;
506
507 /* reserve aid 0 for mcast indication */
508 __set_bit(0, aid_map);
509
510 rcu_read_lock();
511 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
512 __set_bit(sta->sta.aid, aid_map);
513 rcu_read_unlock();
514
515 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
37babce9 516 bitmap_free(aid_map);
0e0060fc
BC		 517
518 if (aid > IEEE80211_MAX_AID)
519 return -ENOBUFS;
520
521 return aid;
522}
523
296fcba3
TP		 524static struct sta_info *
525__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
526{
527 struct sta_info *sta;
0e0060fc 528 int aid;
54ab1ffb 529
296fcba3 530 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 531 return NULL;
532
0e0060fc
BC		 533 aid = mesh_allocate_aid(sdata);
534 if (aid < 0)
535 return NULL;
536
f36fe0a2 537 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
296fcba3
TP		 538 if (!sta)
539 return NULL;
540
433f5bc1 541 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 542 sta->sta.wme = true;
0e0060fc 543 sta->sta.aid = aid;
296fcba3
TP		 544
545 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
546 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
547 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
548
296fcba3
TP		 549 return sta;
550}
551
552static struct sta_info *
553mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
ecbc12ad
BC		 554 struct ieee802_11_elems *elems,
555 struct ieee80211_rx_status *rx_status)
296fcba3
TP		 556{
557 struct sta_info *sta = NULL;
558
a6dad6a2
TP		 559 /* Userspace handles station allocation */
560 if (sdata->u.mesh.user_mpm ||
11197d00
MH		 561 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
562 if (mesh_peer_accepts_plinks(elems) &&
ecbc12ad
BC		 563 mesh_plink_availables(sdata)) {
564 int sig = 0;
565
566 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
567 sig = rx_status->signal;
568
11197d00
MH		 569 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
570 elems->ie_start,
571 elems->total_len,
ecbc12ad
BC		 572 sig, GFP_KERNEL);
573 }
11197d00 574 } else
296fcba3
TP		 575 sta = __mesh_sta_info_alloc(sdata, addr);
576
54ab1ffb
TP		 577 return sta;
578}
579
296fcba3
TP		 580/*
581 * mesh_sta_info_get - return mesh sta info entry for @addr.
582 *
583 * @sdata: local meshif
584 * @addr: peer's address
585 * @elems: IEs from beacon or mesh peering frame.
ecbc12ad 586 * @rx_status: rx status for the frame for signal reporting
296fcba3
TP		 587 *
588 * Return existing or newly allocated sta_info under RCU read lock.
589 * (re)initialize with given IEs.
590 */
591static struct sta_info *
592mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
ecbc12ad
BC		 593 u8 *addr, struct ieee802_11_elems *elems,
594 struct ieee80211_rx_status *rx_status) __acquires(RCU)
296fcba3
TP		 595{
596 struct sta_info *sta = NULL;
597
598 rcu_read_lock();
599 sta = sta_info_get(sdata, addr);
600 if (sta) {
1d6741d8 601 mesh_sta_info_init(sdata, sta, elems);
296fcba3
TP		 602 } else {
603 rcu_read_unlock();
604 /* can't run atomic */
ecbc12ad 605 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
296fcba3
TP		 606 if (!sta) {
607 rcu_read_lock();
608 return NULL;
609 }
610
1d6741d8 611 mesh_sta_info_init(sdata, sta, elems);
3b4797bc 612
296fcba3
TP		 613 if (sta_info_insert_rcu(sta))
614 return NULL;
615 }
616
617 return sta;
618}
619
620/*
621 * mesh_neighbour_update - update or initialize new mesh neighbor.
622 *
623 * @sdata: local meshif
624 * @addr: peer's address
625 * @elems: IEs from beacon or mesh peering frame
ecbc12ad 626 * @rx_status: rx status for the frame for signal reporting
296fcba3
TP		 627 *
628 * Initiates peering if appropriate.
629 */
f743ff49
TP		 630void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
631 u8 *hw_addr,
ecbc12ad
BC		 632 struct ieee802_11_elems *elems,
633 struct ieee80211_rx_status *rx_status)
54ab1ffb
TP		 634{
635 struct sta_info *sta;
15ddba5f 636 u64 changed = 0;
54ab1ffb 637
ecbc12ad 638 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
54ab1ffb
TP		 639 if (!sta)
640 goto out;
641
dbdaee7a
BC		 642 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
643 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
644
1570ca59 645 if (mesh_peer_accepts_plinks(elems) &&
433f5bc1 646 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
54ab1ffb
TP		 647 sdata->u.mesh.accepting_plinks &&
648 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 649 rssi_threshold_check(sdata, sta))
39886b61 650 changed = mesh_plink_open(sta);
c3896d2c 651
3f52b7e3 652 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 653out:
d0709a65 654 rcu_read_unlock();
2b5e1967 655 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 656}
657
4c02d62f 658void mesh_plink_timer(struct timer_list *t)
c3896d2c 659{
4c02d62f 660 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
c3896d2c 661 struct sta_info *sta;
6f101ef0 662 u16 reason = 0;
c3896d2c 663 struct ieee80211_sub_if_data *sdata;
453e66f2 664 struct mesh_config *mshcfg;
4efec451 665 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 666
d0709a65
JB		 667 /*
668 * This STA is valid because sta_info_destroy() will
669 * del_timer_sync() this timer after having made sure
670 * it cannot be readded (by deleting the plink.)
671 */
4c02d62f 672 sta = mesh->plink_sta;
c3896d2c 673
690205f1 674 if (sta->sdata->local->quiescing)
5bb644a0 675 return;
5bb644a0 676
433f5bc1 677 spin_lock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 678
679 /* If a timer fires just before a state transition on another CPU,
680 * we may have already extended the timeout and changed state by the
681 * time we've acquired the lock and arrived here. In that case,
682 * skip this timer and wait for the new one.
683 */
433f5bc1 684 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
2b470c39
BC		 685 mpl_dbg(sta->sdata,
686 "Ignoring timer for %pM in state %s (timer adjusted)",
433f5bc1
JB		 687 sta->sta.addr, mplstates[sta->mesh->plink_state]);
688 spin_unlock_bh(&sta->mesh->plink_lock);
c3896d2c
LCC		 689 return;
690 }
2b470c39
BC		 691
692 /* del_timer() and handler may race when entering these states */
433f5bc1
JB		 693 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
694 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
2b470c39
BC		 695 mpl_dbg(sta->sdata,
696 "Ignoring timer for %pM in state %s (timer deleted)",
433f5bc1
JB		 697 sta->sta.addr, mplstates[sta->mesh->plink_state]);
698 spin_unlock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 699 return;
700 }
701
bdcbd8e0 702 mpl_dbg(sta->sdata,
3088f7d2 703 "Mesh plink timer for %pM fired on state %s\n",
433f5bc1 704 sta->sta.addr, mplstates[sta->mesh->plink_state]);
d0709a65 705 sdata = sta->sdata;
453e66f2 706 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c 707
433f5bc1 708 switch (sta->mesh->plink_state) {
57cf8043
JC		 709 case NL80211_PLINK_OPN_RCVD:
710 case NL80211_PLINK_OPN_SNT:
c3896d2c 711 /* retry timer */
433f5bc1 712 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 713 u32 rand;
bdcbd8e0
JB		 714 mpl_dbg(sta->sdata,
715 "Mesh plink for %pM (retry, timeout): %d %d\n",
433f5bc1
JB		 716 sta->sta.addr, sta->mesh->plink_retries,
717 sta->mesh->plink_timeout);
c3896d2c 718 get_random_bytes(&rand, sizeof(u32));
433f5bc1
JB		 719 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
720 rand % sta->mesh->plink_timeout;
721 ++sta->mesh->plink_retries;
722 mod_plink_timer(sta, sta->mesh->plink_timeout);
4efec451 723 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 724 break;
725 }
6f101ef0 726 reason = WLAN_REASON_MESH_MAX_RETRIES;
fc0561dc 727 fallthrough;
57cf8043 728 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 729 /* confirm timer */
730 if (!reason)
6f101ef0 731 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
433f5bc1 732 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
453e66f2 733 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 734 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 735 break;
57cf8043 736 case NL80211_PLINK_HOLDING:
c3896d2c 737 /* holding timer */
433f5bc1 738 del_timer(&sta->mesh->plink_timer);
c3896d2c 739 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 740 break;
741 default:
c3896d2c
LCC		 742 break;
743 }
433f5bc1 744 spin_unlock_bh(&sta->mesh->plink_lock);
4efec451 745 if (action)
a69bd8e6 746 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1 747 sta->mesh->llid, sta->mesh->plid, reason);
c3896d2c
LCC		 748}
749
0df2f6c1 750static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 751{
433f5bc1 752 sta->mesh->plink_timeout = timeout;
4c02d62f 753 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
c3896d2c
LCC		 754}
755
204d1304 756static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 757 u16 llid)
204d1304
TP		 758{
759 struct ieee80211_local *local = sdata->local;
760 bool in_use = false;
761 struct sta_info *sta;
762
763 rcu_read_lock();
764 list_for_each_entry_rcu(sta, &local->sta_list, list) {
520c75dc
MS		 765 if (sdata != sta->sdata)
766 continue;
767
433f5bc1 768 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
204d1304
TP		 769 in_use = true;
770 break;
771 }
772 }
773 rcu_read_unlock();
774
775 return in_use;
776}
777
6f101ef0 778static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 779{
780 u16 llid;
781
782 do {
783 get_random_bytes(&llid, sizeof(llid));
6f101ef0 784 } while (llid_in_use(sdata, llid));
204d1304 785
6f101ef0 786 return llid;
204d1304
TP		 787}
788
15ddba5f 789u64 mesh_plink_open(struct sta_info *sta)
c3896d2c 790{
d0709a65 791 struct ieee80211_sub_if_data *sdata = sta->sdata;
15ddba5f 792 u64 changed;
c3896d2c 793
c2c98fde 794 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 795 return 0;
53e80511 796
433f5bc1
JB		 797 spin_lock_bh(&sta->mesh->plink_lock);
798 sta->mesh->llid = mesh_get_new_llid(sdata);
799 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
800 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
801 spin_unlock_bh(&sta->mesh->plink_lock);
39886b61 802 return 0;
c3896d2c 803 }
433f5bc1 804 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 805 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
433f5bc1 806 spin_unlock_bh(&sta->mesh->plink_lock);
bdcbd8e0
JB		 807 mpl_dbg(sdata,
808 "Mesh plink: starting establishment with %pM\n",
0c68ae26 809 sta->sta.addr);
c3896d2c 810
3f52b7e3 811 /* set the non-peer mode to active during peering */
39886b61 812 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 813
a69bd8e6 814 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
433f5bc1 815 sta->sta.addr, sta->mesh->llid, 0, 0);
39886b61 816 return changed;
c3896d2c
LCC		 817}
818
15ddba5f 819u64 mesh_plink_block(struct sta_info *sta)
c3896d2c 820{
15ddba5f 821 u64 changed;
c9370197 822
433f5bc1 823 spin_lock_bh(&sta->mesh->plink_lock);
df323818 824 changed = __mesh_plink_deactivate(sta);
433f5bc1
JB		 825 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
826 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82 827 mesh_path_flush_by_nexthop(sta);
c9370197 828
39886b61 829 return changed;
c3896d2c
LCC		 830}
831
e76d67f0
BC		 832static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
833 struct sta_info *sta,
834 enum plink_event event)
835{
836 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
6f101ef0
CYY		 837 u16 reason = (event == CLS_ACPT) ?
838 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0 839
433f5bc1
JB		 840 sta->mesh->reason = reason;
841 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
272a9e26 842 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 843}
844
15ddba5f 845static u64 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
e76d67f0
BC		 846 struct sta_info *sta)
847{
848 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
15ddba5f 849 u64 changed = 0;
e76d67f0 850
433f5bc1
JB		 851 del_timer(&sta->mesh->plink_timer);
852 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
e76d67f0
BC		 853 changed |= mesh_plink_inc_estab_count(sdata);
854 changed |= mesh_set_ht_prot_mode(sdata);
855 changed |= mesh_set_short_slot_time(sdata);
856 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
857 ieee80211_mps_sta_status_update(sta);
858 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
859 return changed;
860}
861
c7e67811
TP		 862/**
863 * mesh_plink_fsm - step @sta MPM based on @event
864 *
865 * @sdata: interface
866 * @sta: mesh neighbor
867 * @event: peering event
868 *
869 * Return: changed MBSS flags
870 */
15ddba5f 871static u64 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
c7e67811
TP		 872 struct sta_info *sta, enum plink_event event)
873{
874 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
875 enum ieee80211_self_protected_actioncode action = 0;
15ddba5f 876 u64 changed = 0;
e596af82 877 bool flush = false;
c7e67811
TP		 878
879 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
433f5bc1 880 mplstates[sta->mesh->plink_state], mplevents[event]);
c7e67811 881
433f5bc1
JB		 882 spin_lock_bh(&sta->mesh->plink_lock);
883 switch (sta->mesh->plink_state) {
c7e67811
TP		 884 case NL80211_PLINK_LISTEN:
885 switch (event) {
886 case CLS_ACPT:
887 mesh_plink_fsm_restart(sta);
888 break;
889 case OPN_ACPT:
433f5bc1
JB		 890 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
891 sta->mesh->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 892 mesh_plink_timer_set(sta,
893 mshcfg->dot11MeshRetryTimeout);
894
895 /* set the non-peer mode to active during peering */
896 changed |= ieee80211_mps_local_status_update(sdata);
897 action = WLAN_SP_MESH_PEERING_OPEN;
898 break;
899 default:
900 break;
901 }
902 break;
903 case NL80211_PLINK_OPN_SNT:
904 switch (event) {
905 case OPN_RJCT:
906 case CNF_RJCT:
907 case CLS_ACPT:
908 mesh_plink_close(sdata, sta, event);
909 action = WLAN_SP_MESH_PEERING_CLOSE;
910 break;
911 case OPN_ACPT:
912 /* retry timer is left untouched */
433f5bc1 913 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
c7e67811
TP		 914 action = WLAN_SP_MESH_PEERING_CONFIRM;
915 break;
916 case CNF_ACPT:
433f5bc1 917 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 918 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 919 break;
920 default:
921 break;
922 }
923 break;
924 case NL80211_PLINK_OPN_RCVD:
925 switch (event) {
926 case OPN_RJCT:
927 case CNF_RJCT:
928 case CLS_ACPT:
929 mesh_plink_close(sdata, sta, event);
930 action = WLAN_SP_MESH_PEERING_CLOSE;
931 break;
932 case OPN_ACPT:
933 action = WLAN_SP_MESH_PEERING_CONFIRM;
934 break;
935 case CNF_ACPT:
936 changed |= mesh_plink_establish(sdata, sta);
937 break;
938 default:
939 break;
940 }
941 break;
942 case NL80211_PLINK_CNF_RCVD:
943 switch (event) {
944 case OPN_RJCT:
945 case CNF_RJCT:
946 case CLS_ACPT:
947 mesh_plink_close(sdata, sta, event);
948 action = WLAN_SP_MESH_PEERING_CLOSE;
949 break;
950 case OPN_ACPT:
951 changed |= mesh_plink_establish(sdata, sta);
952 action = WLAN_SP_MESH_PEERING_CONFIRM;
953 break;
954 default:
955 break;
956 }
957 break;
958 case NL80211_PLINK_ESTAB:
959 switch (event) {
960 case CLS_ACPT:
961 changed |= __mesh_plink_deactivate(sta);
962 changed |= mesh_set_ht_prot_mode(sdata);
963 changed |= mesh_set_short_slot_time(sdata);
964 mesh_plink_close(sdata, sta, event);
965 action = WLAN_SP_MESH_PEERING_CLOSE;
e596af82 966 flush = true;
c7e67811
TP		 967 break;
968 case OPN_ACPT:
969 action = WLAN_SP_MESH_PEERING_CONFIRM;
970 break;
971 default:
972 break;
973 }
974 break;
975 case NL80211_PLINK_HOLDING:
976 switch (event) {
977 case CLS_ACPT:
433f5bc1 978 del_timer(&sta->mesh->plink_timer);
c7e67811
TP		 979 mesh_plink_fsm_restart(sta);
980 break;
981 case OPN_ACPT:
982 case CNF_ACPT:
983 case OPN_RJCT:
984 case CNF_RJCT:
985 action = WLAN_SP_MESH_PEERING_CLOSE;
986 break;
987 default:
988 break;
989 }
990 break;
991 default:
992 /* should not get here, PLINK_BLOCKED is dealt with at the
993 * beginning of the function
994 */
995 break;
996 }
433f5bc1 997 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82
BC		 998 if (flush)
999 mesh_path_flush_by_nexthop(sta);
c7e67811 1000 if (action) {
a69bd8e6 1001 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1
JB		 1002 sta->mesh->llid, sta->mesh->plid,
1003 sta->mesh->reason);
c7e67811
TP		 1004
1005 /* also send confirm in open case */
1006 if (action == WLAN_SP_MESH_PEERING_OPEN) {
a69bd8e6 1007 mesh_plink_frame_tx(sdata, sta,
c7e67811 1008 WLAN_SP_MESH_PEERING_CONFIRM,
433f5bc1
JB		 1009 sta->sta.addr, sta->mesh->llid,
1010 sta->mesh->plid, 0);
c7e67811
TP		 1011 }
1012 }
1013
1014 return changed;
1015}
1016
c99a89ed
TP		 1017/*
1018 * mesh_plink_get_event - get correct MPM event
1019 *
1020 * @sdata: interface
1021 * @sta: peer, leave NULL if processing a frame from a new suitable peer
1022 * @elems: peering management IEs
1023 * @ftype: frame type
1024 * @llid: peer's peer link ID
1025 * @plid: peer's local link ID
1026 *
1027 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1028 * an error.
1029 */
1030static enum plink_event
1031mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1032 struct sta_info *sta,
1033 struct ieee802_11_elems *elems,
1034 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 1035 u16 llid, u16 plid)
c99a89ed
TP		 1036{
1037 enum plink_event event = PLINK_UNDEFINED;
1038 u8 ie_len = elems->peering_len;
1039 bool matches_local;
1040
1041 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1042 mesh_matches_local(sdata, elems));
1043
1044 /* deny open request from non-matching peer */
1045 if (!matches_local && !sta) {
1046 event = OPN_RJCT;
1047 goto out;
1048 }
1049
1050 if (!sta) {
1051 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1052 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1053 goto out;
1054 }
1055 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1056 if (!mesh_plink_free_count(sdata)) {
1057 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1058 goto out;
1059 }
b8631c00
SS		 1060
1061 /* new matching peer */
1062 event = OPN_ACPT;
1063 goto out;
c99a89ed
TP		 1064 } else {
1065 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1066 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1067 goto out;
1068 }
433f5bc1 1069 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
c99a89ed
TP		 1070 goto out;
1071 }
1072
c99a89ed
TP		 1073 switch (ftype) {
1074 case WLAN_SP_MESH_PEERING_OPEN:
1075 if (!matches_local)
1076 event = OPN_RJCT;
8c386b16
JB		 1077 else if (!mesh_plink_free_count(sdata) ||
1078 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1079 event = OPN_IGNR;
1080 else
1081 event = OPN_ACPT;
1082 break;
1083 case WLAN_SP_MESH_PEERING_CONFIRM:
1084 if (!matches_local)
1085 event = CNF_RJCT;
8c386b16
JB		 1086 else if (!mesh_plink_free_count(sdata) ||
1087 sta->mesh->llid != llid ||
1088 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1089 event = CNF_IGNR;
1090 else
1091 event = CNF_ACPT;
1092 break;
1093 case WLAN_SP_MESH_PEERING_CLOSE:
433f5bc1 1094 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
c99a89ed
TP		 1095 /* Do not check for llid or plid. This does not
1096 * follow the standard but since multiple plinks
1097 * per sta are not supported, it is necessary in
1098 * order to avoid a livelock when MP A sees an
1099 * establish peer link to MP B but MP B does not
1100 * see it. This can be caused by a timeout in
1101 * B's peer link establishment or B beign
1102 * restarted.
1103 */
1104 event = CLS_ACPT;
433f5bc1 1105 else if (sta->mesh->plid != plid)
c99a89ed 1106 event = CLS_IGNR;
433f5bc1 1107 else if (ie_len == 8 && sta->mesh->llid != llid)
c99a89ed
TP		 1108 event = CLS_IGNR;
1109 else
1110 event = CLS_ACPT;
1111 break;
1112 default:
1113 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1114 break;
1115 }
1116
1117out:
1118 return event;
1119}
1120
05a23ae9
TP		 1121static void
1122mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1123 struct ieee80211_mgmt *mgmt,
ecbc12ad
BC		 1124 struct ieee802_11_elems *elems,
1125 struct ieee80211_rx_status *rx_status)
c3896d2c 1126{
05a23ae9 1127
c3896d2c
LCC		 1128 struct sta_info *sta;
1129 enum plink_event event;
54ef656b 1130 enum ieee80211_self_protected_actioncode ftype;
15ddba5f 1131 u64 changed = 0;
c99a89ed 1132 u8 ie_len = elems->peering_len;
6f101ef0 1133 u16 plid, llid = 0;
c3896d2c 1134
05a23ae9 1135 if (!elems->peering) {
bdcbd8e0
JB		 1136 mpl_dbg(sdata,
1137 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1138 return;
1139 }
bf7cd94d 1140
05a23ae9 1141 if (elems->rsn_len &&
bf7cd94d 1142 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1143 mpl_dbg(sdata,
1144 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1145 return;
1146 }
c3896d2c 1147
8db09850 1148 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1149 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1150 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1151 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1152 && ie_len != 8)) {
bdcbd8e0
JB		 1153 mpl_dbg(sdata,
1154 "Mesh plink: incorrect plink ie length %d %d\n",
1155 ftype, ie_len);
c3896d2c
LCC		 1156 return;
1157 }
1158
54ef656b 1159 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1160 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1161 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1162 return;
1163 }
1164 /* Note the lines below are correct, the llid in the frame is the plid
1165 * from the point of view of this host.
1166 */
f8134fed 1167 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1168 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1169 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1170 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1171
296fcba3 1172 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1173 rcu_read_lock();
1174
abe60632 1175 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1176
55335137 1177 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1178 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1179 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1180 mgmt->sa);
fc10302e 1181 goto unlock_rcu;
55335137
AN		 1182 }
1183
c3896d2c 1184 /* Now we will figure out the appropriate event... */
c99a89ed 1185 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1186
1187 if (event == OPN_ACPT) {
296fcba3 1188 rcu_read_unlock();
54ab1ffb 1189 /* allocate sta entry if necessary and update info */
ecbc12ad 1190 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
54ab1ffb 1191 if (!sta) {
bdcbd8e0 1192 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1193 goto unlock_rcu;
54ab1ffb 1194 }
433f5bc1 1195 sta->mesh->plid = plid;
c99a89ed 1196 } else if (!sta && event == OPN_RJCT) {
a69bd8e6 1197 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
c99a89ed 1198 mgmt->sa, 0, plid,
6f101ef0 1199 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1200 goto unlock_rcu;
1201 } else if (!sta || event == PLINK_UNDEFINED) {
1202 /* something went wrong */
1203 goto unlock_rcu;
c3896d2c
LCC		 1204 }
1205
a69bd8e6
BC		 1206 if (event == CNF_ACPT) {
1207 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
0e0060fc 1208 if (!sta->mesh->plid)
a69bd8e6 1209 sta->mesh->plid = plid;
a69bd8e6
BC		 1210
1211 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1212 }
6c6fa496 1213
c7e67811 1214 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1215
fc10302e 1216unlock_rcu:
d0709a65 1217 rcu_read_unlock();
57aac7c5 1218
ecccd072 1219 if (changed)
2b5e1967 1220 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1221}
05a23ae9
TP		 1222
1223void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1224 struct ieee80211_mgmt *mgmt, size_t len,
1225 struct ieee80211_rx_status *rx_status)
1226{
5d24828d 1227 struct ieee802_11_elems *elems;
05a23ae9
TP		 1228 size_t baselen;
1229 u8 *baseaddr;
1230
1231 /* need action_code, aux */
1232 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1233 return;
1234
1235 if (sdata->u.mesh.user_mpm)
1236 /* userspace must register for these */
1237 return;
1238
1239 if (is_multicast_ether_addr(mgmt->da)) {
1240 mpl_dbg(sdata,
1241 "Mesh plink: ignore frame from multicast address\n");
1242 return;
1243 }
1244
1245 baseaddr = mgmt->u.action.u.self_prot.variable;
1246 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1247 if (mgmt->u.action.u.self_prot.action_code ==
1248 WLAN_SP_MESH_PEERING_CONFIRM) {
1249 baseaddr += 4;
1250 baselen += 4;
b3e7de87
BC		 1251
1252 if (baselen > len)
1253 return;
05a23ae9 1254 }
38c6aa29 1255 elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL);
1fc4a3ee
JB		 1256 if (elems) {
1257 mesh_process_plink_frame(sdata, mgmt, elems, rx_status);
1258 kfree(elems);
1259 }
05a23ae9 1260}
Linux 6.x block layer and io_uring tree(s)