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wifi: mac80211_hwsim: implement sta_state for MLO
[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;
60ad72da 222 u8 ie_len_he_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);
65e8b0cc 228 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 229 hdr_len +
230 2 + /* capability info */
231 2 + /* AID */
232 2 + 8 + /* supported rates */
233 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
234 2 + sdata->u.mesh.mesh_id_len +
235 2 + sizeof(struct ieee80211_meshconf_ie) +
176f3608 236 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 237 2 + sizeof(struct ieee80211_ht_operation) +
c85fb53c
BC		 238 2 + sizeof(struct ieee80211_vht_cap) +
239 2 + sizeof(struct ieee80211_vht_operation) +
60ad72da
SE		 240 ie_len_he_cap +
241 2 + 1 + sizeof(struct ieee80211_he_operation) +
d1b7524b 242 sizeof(struct ieee80211_he_6ghz_oper) +
24a2042c 243 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
3b69a9c5
TP		 244 2 + 8 + /* peering IE */
245 sdata->u.mesh.ie_len);
c3896d2c 246 if (!skb)
87d84c45 247 return err;
e7570dfb 248 info = IEEE80211_SKB_CB(skb);
65e8b0cc 249 skb_reserve(skb, local->tx_headroom);
b080db58 250 mgmt = skb_put_zero(skb, hdr_len);
e7827a70
HH		 251 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
252 IEEE80211_STYPE_ACTION);
c3896d2c 253 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 254 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 255 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 256 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
257 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 258
8db09850 259 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
21a8e9dd
MSS		 260 struct ieee80211_supported_band *sband;
261 enum nl80211_band band;
262
263 sband = ieee80211_get_sband(sdata);
264 if (!sband) {
265 err = -EINVAL;
266 goto free;
267 }
268 band = sband->band;
55de908a 269
8db09850 270 /* capability info */
e45a79da 271 pos = skb_put_zero(skb, 2);
54ef656b 272 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 273 /* AID */
274 pos = skb_put(skb, 2);
a69bd8e6 275 put_unaligned_le16(sta->sta.aid, pos);
c3896d2c 276 }
55de908a
JB		 277 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
278 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 279 mesh_add_rsn_ie(sdata, skb) ||
280 mesh_add_meshid_ie(sdata, skb) ||
281 mesh_add_meshconf_ie(sdata, skb))
f609a43d 282 goto free;
8db09850 283 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 284 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 285 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 286 goto free;
c3896d2c
LCC		 287 }
288
8db09850 289 /* Add Mesh Peering Management element */
c3896d2c 290 switch (action) {
54ef656b 291 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 292 break;
54ef656b 293 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 294 ie_len += 2;
c3896d2c
LCC		 295 include_plid = true;
296 break;
54ef656b 297 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 298 if (plid) {
299 ie_len += 2;
c3896d2c
LCC		 300 include_plid = true;
301 }
8db09850 302 ie_len += 2; /* reason code */
c3896d2c 303 break;
8db09850 304 default:
f609a43d
TP		 305 err = -EINVAL;
306 goto free;
c3896d2c
LCC		 307 }
308
8db09850 309 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 310 goto free;
8db09850 311
c3896d2c 312 pos = skb_put(skb, 2 + ie_len);
8db09850 313 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 314 *pos++ = ie_len;
8db09850
TP		 315 memcpy(pos, &peering_proto, 2);
316 pos += 2;
6f101ef0 317 put_unaligned_le16(llid, pos);
8db09850 318 pos += 2;
c3896d2c 319 if (include_plid) {
6f101ef0 320 put_unaligned_le16(plid, pos);
8db09850 321 pos += 2;
c3896d2c 322 }
54ef656b 323 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 324 put_unaligned_le16(reason, pos);
8db09850 325 pos += 2;
c3896d2c 326 }
176f3608
TP		 327
328 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d 329 if (mesh_add_ht_cap_ie(sdata, skb) ||
c85fb53c
BC		 330 mesh_add_ht_oper_ie(sdata, skb) ||
331 mesh_add_vht_cap_ie(sdata, skb) ||
60ad72da
SE		 332 mesh_add_vht_oper_ie(sdata, skb) ||
333 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
24a2042c
RM		 334 mesh_add_he_oper_ie(sdata, skb) ||
335 mesh_add_he_6ghz_cap_ie(sdata, skb))
f609a43d 336 goto free;
176f3608
TP		 337 }
338
bf7cd94d 339 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 340 goto free;
c3896d2c 341
62ae67be 342 ieee80211_tx_skb(sdata, skb);
c3896d2c 343 return 0;
f609a43d
TP		 344free:
345 kfree_skb(skb);
346 return err;
c3896d2c
LCC		 347}
348
fa87a656
BC		 349/**
350 * __mesh_plink_deactivate - deactivate mesh peer link
351 *
352 * @sta: mesh peer link to deactivate
353 *
e596af82
BC		 354 * Mesh paths with this peer as next hop should be flushed
355 * by the caller outside of plink_lock.
356 *
fa87a656
BC		 357 * Returns beacon changed flag if the beacon content changed.
358 *
359 * Locking: the caller must hold sta->mesh->plink_lock
360 */
361static u32 __mesh_plink_deactivate(struct sta_info *sta)
362{
363 struct ieee80211_sub_if_data *sdata = sta->sdata;
364 u32 changed = 0;
365
366 lockdep_assert_held(&sta->mesh->plink_lock);
367
368 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
369 changed = mesh_plink_dec_estab_count(sdata);
370 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
fa87a656
BC		 371
372 ieee80211_mps_sta_status_update(sta);
373 changed |= ieee80211_mps_set_sta_local_pm(sta,
374 NL80211_MESH_POWER_UNKNOWN);
375
376 return changed;
377}
378
379/**
380 * mesh_plink_deactivate - deactivate mesh peer link
381 *
382 * @sta: mesh peer link to deactivate
383 *
384 * All mesh paths with this peer as next hop will be flushed
385 */
386u32 mesh_plink_deactivate(struct sta_info *sta)
387{
388 struct ieee80211_sub_if_data *sdata = sta->sdata;
389 u32 changed;
390
391 spin_lock_bh(&sta->mesh->plink_lock);
392 changed = __mesh_plink_deactivate(sta);
efc401f4
BC		 393
394 if (!sdata->u.mesh.user_mpm) {
395 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
396 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
397 sta->sta.addr, sta->mesh->llid,
398 sta->mesh->plid, sta->mesh->reason);
399 }
fa87a656 400 spin_unlock_bh(&sta->mesh->plink_lock);
efc401f4
BC		 401 if (!sdata->u.mesh.user_mpm)
402 del_timer_sync(&sta->mesh->plink_timer);
e596af82 403 mesh_path_flush_by_nexthop(sta);
fa87a656 404
efc401f4
BC		 405 /* make sure no readers can access nexthop sta from here on */
406 synchronize_net();
407
fa87a656
BC		 408 return changed;
409}
410
296fcba3
TP		 411static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
412 struct sta_info *sta,
1d6741d8 413 struct ieee802_11_elems *elems)
c3896d2c 414{
f698d856 415 struct ieee80211_local *local = sdata->local;
54ab1ffb 416 struct ieee80211_supported_band *sband;
f68d776a 417 u32 rates, basic_rates = 0, changed = 0;
046d2e7c 418 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
c3896d2c 419
21a8e9dd
MSS		 420 sband = ieee80211_get_sband(sdata);
421 if (!sband)
422 return;
423
424 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
425 &basic_rates);
d0709a65 426
433f5bc1 427 spin_lock_bh(&sta->mesh->plink_lock);
046d2e7c 428 sta->deflink.rx_stats.last_rx = jiffies;
296fcba3
TP		 429
430 /* rates and capabilities don't change during peering */
433f5bc1
JB		 431 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
432 sta->mesh->processed_beacon)
296fcba3 433 goto out;
433f5bc1 434 sta->mesh->processed_beacon = true;
bae35d92 435
046d2e7c 436 if (sta->sta.deflink.supp_rates[sband->band] != rates)
f68d776a 437 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
046d2e7c 438 sta->sta.deflink.supp_rates[sband->band] = rates;
54ab1ffb 439
52ac8c48 440 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
c71420db
JB		 441 elems->ht_cap_elem,
442 &sta->deflink))
52ac8c48 443 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 444
c85fb53c 445 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
c71420db
JB		 446 elems->vht_cap_elem,
447 &sta->deflink);
c85fb53c 448
60ad72da 449 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
1bb9a8a4
JB		 450 elems->he_cap_len,
451 elems->he_6ghz_capa,
c71420db 452 &sta->deflink);
60ad72da 453
046d2e7c 454 if (bw != sta->sta.deflink.bandwidth)
abcff6ef
JD		 455 changed |= IEEE80211_RC_BW_CHANGED;
456
52ac8c48
TP		 457 /* HT peer is operating 20MHz-only */
458 if (elems->ht_operation &&
459 !(elems->ht_operation->ht_param &
460 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
046d2e7c 461 if (sta->sta.deflink.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 462 changed |= IEEE80211_RC_BW_CHANGED;
046d2e7c 463 sta->sta.deflink.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 464 }
c7d25828 465
1d6741d8 466 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
59cf1d65 467 rate_control_rate_init(sta);
f68d776a 468 else
b4f85443 469 rate_control_rate_update(local, sband, sta, 0, changed);
296fcba3 470out:
433f5bc1 471 spin_unlock_bh(&sta->mesh->plink_lock);
296fcba3
TP		 472}
473
0e0060fc
BC		 474static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
475{
476 struct sta_info *sta;
477 unsigned long *aid_map;
478 int aid;
479
37babce9 480 aid_map = bitmap_zalloc(IEEE80211_MAX_AID + 1, GFP_KERNEL);
0e0060fc
BC		 481 if (!aid_map)
482 return -ENOMEM;
483
484 /* reserve aid 0 for mcast indication */
485 __set_bit(0, aid_map);
486
487 rcu_read_lock();
488 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
489 __set_bit(sta->sta.aid, aid_map);
490 rcu_read_unlock();
491
492 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
37babce9 493 bitmap_free(aid_map);
0e0060fc
BC		 494
495 if (aid > IEEE80211_MAX_AID)
496 return -ENOBUFS;
497
498 return aid;
499}
500
296fcba3
TP		 501static struct sta_info *
502__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
503{
504 struct sta_info *sta;
0e0060fc 505 int aid;
54ab1ffb 506
296fcba3 507 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 508 return NULL;
509
0e0060fc
BC		 510 aid = mesh_allocate_aid(sdata);
511 if (aid < 0)
512 return NULL;
513
cb71f1d1 514 sta = sta_info_alloc(sdata, hw_addr, -1, GFP_KERNEL);
296fcba3
TP		 515 if (!sta)
516 return NULL;
517
433f5bc1 518 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 519 sta->sta.wme = true;
0e0060fc 520 sta->sta.aid = aid;
296fcba3
TP		 521
522 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
523 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
524 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
525
296fcba3
TP		 526 return sta;
527}
528
529static struct sta_info *
530mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
ecbc12ad
BC		 531 struct ieee802_11_elems *elems,
532 struct ieee80211_rx_status *rx_status)
296fcba3
TP		 533{
534 struct sta_info *sta = NULL;
535
a6dad6a2
TP		 536 /* Userspace handles station allocation */
537 if (sdata->u.mesh.user_mpm ||
11197d00
MH		 538 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
539 if (mesh_peer_accepts_plinks(elems) &&
ecbc12ad
BC		 540 mesh_plink_availables(sdata)) {
541 int sig = 0;
542
543 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
544 sig = rx_status->signal;
545
11197d00
MH		 546 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
547 elems->ie_start,
548 elems->total_len,
ecbc12ad
BC		 549 sig, GFP_KERNEL);
550 }
11197d00 551 } else
296fcba3
TP		 552 sta = __mesh_sta_info_alloc(sdata, addr);
553
54ab1ffb
TP		 554 return sta;
555}
556
296fcba3
TP		 557/*
558 * mesh_sta_info_get - return mesh sta info entry for @addr.
559 *
560 * @sdata: local meshif
561 * @addr: peer's address
562 * @elems: IEs from beacon or mesh peering frame.
ecbc12ad 563 * @rx_status: rx status for the frame for signal reporting
296fcba3
TP		 564 *
565 * Return existing or newly allocated sta_info under RCU read lock.
566 * (re)initialize with given IEs.
567 */
568static struct sta_info *
569mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
ecbc12ad
BC		 570 u8 *addr, struct ieee802_11_elems *elems,
571 struct ieee80211_rx_status *rx_status) __acquires(RCU)
296fcba3
TP		 572{
573 struct sta_info *sta = NULL;
574
575 rcu_read_lock();
576 sta = sta_info_get(sdata, addr);
577 if (sta) {
1d6741d8 578 mesh_sta_info_init(sdata, sta, elems);
296fcba3
TP		 579 } else {
580 rcu_read_unlock();
581 /* can't run atomic */
ecbc12ad 582 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
296fcba3
TP		 583 if (!sta) {
584 rcu_read_lock();
585 return NULL;
586 }
587
1d6741d8 588 mesh_sta_info_init(sdata, sta, elems);
3b4797bc 589
296fcba3
TP		 590 if (sta_info_insert_rcu(sta))
591 return NULL;
592 }
593
594 return sta;
595}
596
597/*
598 * mesh_neighbour_update - update or initialize new mesh neighbor.
599 *
600 * @sdata: local meshif
601 * @addr: peer's address
602 * @elems: IEs from beacon or mesh peering frame
ecbc12ad 603 * @rx_status: rx status for the frame for signal reporting
296fcba3
TP		 604 *
605 * Initiates peering if appropriate.
606 */
f743ff49
TP		 607void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
608 u8 *hw_addr,
ecbc12ad
BC		 609 struct ieee802_11_elems *elems,
610 struct ieee80211_rx_status *rx_status)
54ab1ffb
TP		 611{
612 struct sta_info *sta;
39886b61 613 u32 changed = 0;
54ab1ffb 614
ecbc12ad 615 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
54ab1ffb
TP		 616 if (!sta)
617 goto out;
618
dbdaee7a
BC		 619 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
620 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
621
1570ca59 622 if (mesh_peer_accepts_plinks(elems) &&
433f5bc1 623 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
54ab1ffb
TP		 624 sdata->u.mesh.accepting_plinks &&
625 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 626 rssi_threshold_check(sdata, sta))
39886b61 627 changed = mesh_plink_open(sta);
c3896d2c 628
3f52b7e3 629 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 630out:
d0709a65 631 rcu_read_unlock();
2b5e1967 632 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 633}
634
4c02d62f 635void mesh_plink_timer(struct timer_list *t)
c3896d2c 636{
4c02d62f 637 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
c3896d2c 638 struct sta_info *sta;
6f101ef0 639 u16 reason = 0;
c3896d2c 640 struct ieee80211_sub_if_data *sdata;
453e66f2 641 struct mesh_config *mshcfg;
4efec451 642 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 643
d0709a65
JB		 644 /*
645 * This STA is valid because sta_info_destroy() will
646 * del_timer_sync() this timer after having made sure
647 * it cannot be readded (by deleting the plink.)
648 */
4c02d62f 649 sta = mesh->plink_sta;
c3896d2c 650
690205f1 651 if (sta->sdata->local->quiescing)
5bb644a0 652 return;
5bb644a0 653
433f5bc1 654 spin_lock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 655
656 /* If a timer fires just before a state transition on another CPU,
657 * we may have already extended the timeout and changed state by the
658 * time we've acquired the lock and arrived here. In that case,
659 * skip this timer and wait for the new one.
660 */
433f5bc1 661 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
2b470c39
BC		 662 mpl_dbg(sta->sdata,
663 "Ignoring timer for %pM in state %s (timer adjusted)",
433f5bc1
JB		 664 sta->sta.addr, mplstates[sta->mesh->plink_state]);
665 spin_unlock_bh(&sta->mesh->plink_lock);
c3896d2c
LCC		 666 return;
667 }
2b470c39
BC		 668
669 /* del_timer() and handler may race when entering these states */
433f5bc1
JB		 670 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
671 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
2b470c39
BC		 672 mpl_dbg(sta->sdata,
673 "Ignoring timer for %pM in state %s (timer deleted)",
433f5bc1
JB		 674 sta->sta.addr, mplstates[sta->mesh->plink_state]);
675 spin_unlock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 676 return;
677 }
678
bdcbd8e0 679 mpl_dbg(sta->sdata,
3088f7d2 680 "Mesh plink timer for %pM fired on state %s\n",
433f5bc1 681 sta->sta.addr, mplstates[sta->mesh->plink_state]);
d0709a65 682 sdata = sta->sdata;
453e66f2 683 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c 684
433f5bc1 685 switch (sta->mesh->plink_state) {
57cf8043
JC		 686 case NL80211_PLINK_OPN_RCVD:
687 case NL80211_PLINK_OPN_SNT:
c3896d2c 688 /* retry timer */
433f5bc1 689 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 690 u32 rand;
bdcbd8e0
JB		 691 mpl_dbg(sta->sdata,
692 "Mesh plink for %pM (retry, timeout): %d %d\n",
433f5bc1
JB		 693 sta->sta.addr, sta->mesh->plink_retries,
694 sta->mesh->plink_timeout);
c3896d2c 695 get_random_bytes(&rand, sizeof(u32));
433f5bc1
JB		 696 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
697 rand % sta->mesh->plink_timeout;
698 ++sta->mesh->plink_retries;
699 mod_plink_timer(sta, sta->mesh->plink_timeout);
4efec451 700 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 701 break;
702 }
6f101ef0 703 reason = WLAN_REASON_MESH_MAX_RETRIES;
fc0561dc 704 fallthrough;
57cf8043 705 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 706 /* confirm timer */
707 if (!reason)
6f101ef0 708 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
433f5bc1 709 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
453e66f2 710 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 711 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 712 break;
57cf8043 713 case NL80211_PLINK_HOLDING:
c3896d2c 714 /* holding timer */
433f5bc1 715 del_timer(&sta->mesh->plink_timer);
c3896d2c 716 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 717 break;
718 default:
c3896d2c
LCC		 719 break;
720 }
433f5bc1 721 spin_unlock_bh(&sta->mesh->plink_lock);
4efec451 722 if (action)
a69bd8e6 723 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1 724 sta->mesh->llid, sta->mesh->plid, reason);
c3896d2c
LCC		 725}
726
0df2f6c1 727static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 728{
433f5bc1 729 sta->mesh->plink_timeout = timeout;
4c02d62f 730 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
c3896d2c
LCC		 731}
732
204d1304 733static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 734 u16 llid)
204d1304
TP		 735{
736 struct ieee80211_local *local = sdata->local;
737 bool in_use = false;
738 struct sta_info *sta;
739
740 rcu_read_lock();
741 list_for_each_entry_rcu(sta, &local->sta_list, list) {
520c75dc
MS		 742 if (sdata != sta->sdata)
743 continue;
744
433f5bc1 745 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
204d1304
TP		 746 in_use = true;
747 break;
748 }
749 }
750 rcu_read_unlock();
751
752 return in_use;
753}
754
6f101ef0 755static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 756{
757 u16 llid;
758
759 do {
760 get_random_bytes(&llid, sizeof(llid));
6f101ef0 761 } while (llid_in_use(sdata, llid));
204d1304 762
6f101ef0 763 return llid;
204d1304
TP		 764}
765
39886b61 766u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 767{
d0709a65 768 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 769 u32 changed;
c3896d2c 770
c2c98fde 771 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 772 return 0;
53e80511 773
433f5bc1
JB		 774 spin_lock_bh(&sta->mesh->plink_lock);
775 sta->mesh->llid = mesh_get_new_llid(sdata);
776 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
777 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
778 spin_unlock_bh(&sta->mesh->plink_lock);
39886b61 779 return 0;
c3896d2c 780 }
433f5bc1 781 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 782 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
433f5bc1 783 spin_unlock_bh(&sta->mesh->plink_lock);
bdcbd8e0
JB		 784 mpl_dbg(sdata,
785 "Mesh plink: starting establishment with %pM\n",
0c68ae26 786 sta->sta.addr);
c3896d2c 787
3f52b7e3 788 /* set the non-peer mode to active during peering */
39886b61 789 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 790
a69bd8e6 791 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
433f5bc1 792 sta->sta.addr, sta->mesh->llid, 0, 0);
39886b61 793 return changed;
c3896d2c
LCC		 794}
795
39886b61 796u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 797{
df323818 798 u32 changed;
c9370197 799
433f5bc1 800 spin_lock_bh(&sta->mesh->plink_lock);
df323818 801 changed = __mesh_plink_deactivate(sta);
433f5bc1
JB		 802 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
803 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82 804 mesh_path_flush_by_nexthop(sta);
c9370197 805
39886b61 806 return changed;
c3896d2c
LCC		 807}
808
e76d67f0
BC		 809static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
810 struct sta_info *sta,
811 enum plink_event event)
812{
813 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
6f101ef0
CYY		 814 u16 reason = (event == CLS_ACPT) ?
815 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0 816
433f5bc1
JB		 817 sta->mesh->reason = reason;
818 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
272a9e26 819 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 820}
821
822static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
823 struct sta_info *sta)
824{
825 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
826 u32 changed = 0;
827
433f5bc1
JB		 828 del_timer(&sta->mesh->plink_timer);
829 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
e76d67f0
BC		 830 changed |= mesh_plink_inc_estab_count(sdata);
831 changed |= mesh_set_ht_prot_mode(sdata);
832 changed |= mesh_set_short_slot_time(sdata);
833 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
834 ieee80211_mps_sta_status_update(sta);
835 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
836 return changed;
837}
838
c7e67811
TP		 839/**
840 * mesh_plink_fsm - step @sta MPM based on @event
841 *
842 * @sdata: interface
843 * @sta: mesh neighbor
844 * @event: peering event
845 *
846 * Return: changed MBSS flags
847 */
848static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
849 struct sta_info *sta, enum plink_event event)
850{
851 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
852 enum ieee80211_self_protected_actioncode action = 0;
853 u32 changed = 0;
e596af82 854 bool flush = false;
c7e67811
TP		 855
856 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
433f5bc1 857 mplstates[sta->mesh->plink_state], mplevents[event]);
c7e67811 858
433f5bc1
JB		 859 spin_lock_bh(&sta->mesh->plink_lock);
860 switch (sta->mesh->plink_state) {
c7e67811
TP		 861 case NL80211_PLINK_LISTEN:
862 switch (event) {
863 case CLS_ACPT:
864 mesh_plink_fsm_restart(sta);
865 break;
866 case OPN_ACPT:
433f5bc1
JB		 867 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
868 sta->mesh->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 869 mesh_plink_timer_set(sta,
870 mshcfg->dot11MeshRetryTimeout);
871
872 /* set the non-peer mode to active during peering */
873 changed |= ieee80211_mps_local_status_update(sdata);
874 action = WLAN_SP_MESH_PEERING_OPEN;
875 break;
876 default:
877 break;
878 }
879 break;
880 case NL80211_PLINK_OPN_SNT:
881 switch (event) {
882 case OPN_RJCT:
883 case CNF_RJCT:
884 case CLS_ACPT:
885 mesh_plink_close(sdata, sta, event);
886 action = WLAN_SP_MESH_PEERING_CLOSE;
887 break;
888 case OPN_ACPT:
889 /* retry timer is left untouched */
433f5bc1 890 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
c7e67811
TP		 891 action = WLAN_SP_MESH_PEERING_CONFIRM;
892 break;
893 case CNF_ACPT:
433f5bc1 894 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 895 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 896 break;
897 default:
898 break;
899 }
900 break;
901 case NL80211_PLINK_OPN_RCVD:
902 switch (event) {
903 case OPN_RJCT:
904 case CNF_RJCT:
905 case CLS_ACPT:
906 mesh_plink_close(sdata, sta, event);
907 action = WLAN_SP_MESH_PEERING_CLOSE;
908 break;
909 case OPN_ACPT:
910 action = WLAN_SP_MESH_PEERING_CONFIRM;
911 break;
912 case CNF_ACPT:
913 changed |= mesh_plink_establish(sdata, sta);
914 break;
915 default:
916 break;
917 }
918 break;
919 case NL80211_PLINK_CNF_RCVD:
920 switch (event) {
921 case OPN_RJCT:
922 case CNF_RJCT:
923 case CLS_ACPT:
924 mesh_plink_close(sdata, sta, event);
925 action = WLAN_SP_MESH_PEERING_CLOSE;
926 break;
927 case OPN_ACPT:
928 changed |= mesh_plink_establish(sdata, sta);
929 action = WLAN_SP_MESH_PEERING_CONFIRM;
930 break;
931 default:
932 break;
933 }
934 break;
935 case NL80211_PLINK_ESTAB:
936 switch (event) {
937 case CLS_ACPT:
938 changed |= __mesh_plink_deactivate(sta);
939 changed |= mesh_set_ht_prot_mode(sdata);
940 changed |= mesh_set_short_slot_time(sdata);
941 mesh_plink_close(sdata, sta, event);
942 action = WLAN_SP_MESH_PEERING_CLOSE;
e596af82 943 flush = true;
c7e67811
TP		 944 break;
945 case OPN_ACPT:
946 action = WLAN_SP_MESH_PEERING_CONFIRM;
947 break;
948 default:
949 break;
950 }
951 break;
952 case NL80211_PLINK_HOLDING:
953 switch (event) {
954 case CLS_ACPT:
433f5bc1 955 del_timer(&sta->mesh->plink_timer);
c7e67811
TP		 956 mesh_plink_fsm_restart(sta);
957 break;
958 case OPN_ACPT:
959 case CNF_ACPT:
960 case OPN_RJCT:
961 case CNF_RJCT:
962 action = WLAN_SP_MESH_PEERING_CLOSE;
963 break;
964 default:
965 break;
966 }
967 break;
968 default:
969 /* should not get here, PLINK_BLOCKED is dealt with at the
970 * beginning of the function
971 */
972 break;
973 }
433f5bc1 974 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82
BC		 975 if (flush)
976 mesh_path_flush_by_nexthop(sta);
c7e67811 977 if (action) {
a69bd8e6 978 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1
JB		 979 sta->mesh->llid, sta->mesh->plid,
980 sta->mesh->reason);
c7e67811
TP		 981
982 /* also send confirm in open case */
983 if (action == WLAN_SP_MESH_PEERING_OPEN) {
a69bd8e6 984 mesh_plink_frame_tx(sdata, sta,
c7e67811 985 WLAN_SP_MESH_PEERING_CONFIRM,
433f5bc1
JB		 986 sta->sta.addr, sta->mesh->llid,
987 sta->mesh->plid, 0);
c7e67811
TP		 988 }
989 }
990
991 return changed;
992}
993
c99a89ed
TP		 994/*
995 * mesh_plink_get_event - get correct MPM event
996 *
997 * @sdata: interface
998 * @sta: peer, leave NULL if processing a frame from a new suitable peer
999 * @elems: peering management IEs
1000 * @ftype: frame type
1001 * @llid: peer's peer link ID
1002 * @plid: peer's local link ID
1003 *
1004 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1005 * an error.
1006 */
1007static enum plink_event
1008mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1009 struct sta_info *sta,
1010 struct ieee802_11_elems *elems,
1011 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 1012 u16 llid, u16 plid)
c99a89ed
TP		 1013{
1014 enum plink_event event = PLINK_UNDEFINED;
1015 u8 ie_len = elems->peering_len;
1016 bool matches_local;
1017
1018 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1019 mesh_matches_local(sdata, elems));
1020
1021 /* deny open request from non-matching peer */
1022 if (!matches_local && !sta) {
1023 event = OPN_RJCT;
1024 goto out;
1025 }
1026
1027 if (!sta) {
1028 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1029 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1030 goto out;
1031 }
1032 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1033 if (!mesh_plink_free_count(sdata)) {
1034 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1035 goto out;
1036 }
b8631c00
SS		 1037
1038 /* new matching peer */
1039 event = OPN_ACPT;
1040 goto out;
c99a89ed
TP		 1041 } else {
1042 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1043 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1044 goto out;
1045 }
433f5bc1 1046 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
c99a89ed
TP		 1047 goto out;
1048 }
1049
c99a89ed
TP		 1050 switch (ftype) {
1051 case WLAN_SP_MESH_PEERING_OPEN:
1052 if (!matches_local)
1053 event = OPN_RJCT;
1054 if (!mesh_plink_free_count(sdata) ||
433f5bc1 1055 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1056 event = OPN_IGNR;
1057 else
1058 event = OPN_ACPT;
1059 break;
1060 case WLAN_SP_MESH_PEERING_CONFIRM:
1061 if (!matches_local)
1062 event = CNF_RJCT;
1063 if (!mesh_plink_free_count(sdata) ||
433f5bc1
JB		 1064 sta->mesh->llid != llid ||
1065 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1066 event = CNF_IGNR;
1067 else
1068 event = CNF_ACPT;
1069 break;
1070 case WLAN_SP_MESH_PEERING_CLOSE:
433f5bc1 1071 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
c99a89ed
TP		 1072 /* Do not check for llid or plid. This does not
1073 * follow the standard but since multiple plinks
1074 * per sta are not supported, it is necessary in
1075 * order to avoid a livelock when MP A sees an
1076 * establish peer link to MP B but MP B does not
1077 * see it. This can be caused by a timeout in
1078 * B's peer link establishment or B beign
1079 * restarted.
1080 */
1081 event = CLS_ACPT;
433f5bc1 1082 else if (sta->mesh->plid != plid)
c99a89ed 1083 event = CLS_IGNR;
433f5bc1 1084 else if (ie_len == 8 && sta->mesh->llid != llid)
c99a89ed
TP		 1085 event = CLS_IGNR;
1086 else
1087 event = CLS_ACPT;
1088 break;
1089 default:
1090 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1091 break;
1092 }
1093
1094out:
1095 return event;
1096}
1097
05a23ae9
TP		 1098static void
1099mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1100 struct ieee80211_mgmt *mgmt,
ecbc12ad
BC		 1101 struct ieee802_11_elems *elems,
1102 struct ieee80211_rx_status *rx_status)
c3896d2c 1103{
05a23ae9 1104
c3896d2c
LCC		 1105 struct sta_info *sta;
1106 enum plink_event event;
54ef656b 1107 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 1108 u32 changed = 0;
c99a89ed 1109 u8 ie_len = elems->peering_len;
6f101ef0 1110 u16 plid, llid = 0;
c3896d2c 1111
05a23ae9 1112 if (!elems->peering) {
bdcbd8e0
JB		 1113 mpl_dbg(sdata,
1114 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1115 return;
1116 }
bf7cd94d 1117
05a23ae9 1118 if (elems->rsn_len &&
bf7cd94d 1119 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1120 mpl_dbg(sdata,
1121 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1122 return;
1123 }
c3896d2c 1124
8db09850 1125 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1126 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1127 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1128 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1129 && ie_len != 8)) {
bdcbd8e0
JB		 1130 mpl_dbg(sdata,
1131 "Mesh plink: incorrect plink ie length %d %d\n",
1132 ftype, ie_len);
c3896d2c
LCC		 1133 return;
1134 }
1135
54ef656b 1136 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1137 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1138 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1139 return;
1140 }
1141 /* Note the lines below are correct, the llid in the frame is the plid
1142 * from the point of view of this host.
1143 */
f8134fed 1144 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1145 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1146 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1147 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1148
296fcba3 1149 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1150 rcu_read_lock();
1151
abe60632 1152 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1153
55335137 1154 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1155 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1156 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1157 mgmt->sa);
fc10302e 1158 goto unlock_rcu;
55335137
AN		 1159 }
1160
c3896d2c 1161 /* Now we will figure out the appropriate event... */
c99a89ed 1162 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1163
1164 if (event == OPN_ACPT) {
296fcba3 1165 rcu_read_unlock();
54ab1ffb 1166 /* allocate sta entry if necessary and update info */
ecbc12ad 1167 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
54ab1ffb 1168 if (!sta) {
bdcbd8e0 1169 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1170 goto unlock_rcu;
54ab1ffb 1171 }
433f5bc1 1172 sta->mesh->plid = plid;
c99a89ed 1173 } else if (!sta && event == OPN_RJCT) {
a69bd8e6 1174 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
c99a89ed 1175 mgmt->sa, 0, plid,
6f101ef0 1176 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1177 goto unlock_rcu;
1178 } else if (!sta || event == PLINK_UNDEFINED) {
1179 /* something went wrong */
1180 goto unlock_rcu;
c3896d2c
LCC		 1181 }
1182
a69bd8e6
BC		 1183 if (event == CNF_ACPT) {
1184 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
0e0060fc 1185 if (!sta->mesh->plid)
a69bd8e6 1186 sta->mesh->plid = plid;
a69bd8e6
BC		 1187
1188 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1189 }
6c6fa496 1190
c7e67811 1191 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1192
fc10302e 1193unlock_rcu:
d0709a65 1194 rcu_read_unlock();
57aac7c5 1195
ecccd072 1196 if (changed)
2b5e1967 1197 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1198}
05a23ae9
TP		 1199
1200void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1201 struct ieee80211_mgmt *mgmt, size_t len,
1202 struct ieee80211_rx_status *rx_status)
1203{
5d24828d 1204 struct ieee802_11_elems *elems;
05a23ae9
TP		 1205 size_t baselen;
1206 u8 *baseaddr;
1207
1208 /* need action_code, aux */
1209 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1210 return;
1211
1212 if (sdata->u.mesh.user_mpm)
1213 /* userspace must register for these */
1214 return;
1215
1216 if (is_multicast_ether_addr(mgmt->da)) {
1217 mpl_dbg(sdata,
1218 "Mesh plink: ignore frame from multicast address\n");
1219 return;
1220 }
1221
1222 baseaddr = mgmt->u.action.u.self_prot.variable;
1223 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1224 if (mgmt->u.action.u.self_prot.action_code ==
1225 WLAN_SP_MESH_PEERING_CONFIRM) {
1226 baseaddr += 4;
1227 baselen += 4;
b3e7de87
BC		 1228
1229 if (baselen > len)
1230 return;
05a23ae9 1231 }
38c6aa29 1232 elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL);
5d24828d
JB		 1233 mesh_process_plink_frame(sdata, mgmt, elems, rx_status);
1234 kfree(elems);
05a23ae9 1235}
Linux 6.x block layer and io_uring tree(s)