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wifi: mac80211: mesh: fix some kdoc warnings
[linux-2.6-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.
15ddba5f 4 * Copyright (C) 2019, 2021-2023 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
0418a445
SW		 166 switch (sdata->vif.bss_conf.chandef.width) {
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 &&
4bf88530 199 sdata->vif.bss_conf.chandef.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
60ad72da
SE		 229 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
230 NL80211_IFTYPE_MESH_POINT);
df1875c4
RL		 231 ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata,
232 NL80211_IFTYPE_MESH_POINT);
65e8b0cc 233 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 234 hdr_len +
235 2 + /* capability info */
236 2 + /* AID */
237 2 + 8 + /* supported rates */
238 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
239 2 + sdata->u.mesh.mesh_id_len +
240 2 + sizeof(struct ieee80211_meshconf_ie) +
176f3608 241 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 242 2 + sizeof(struct ieee80211_ht_operation) +
c85fb53c
BC		 243 2 + sizeof(struct ieee80211_vht_cap) +
244 2 + sizeof(struct ieee80211_vht_operation) +
60ad72da
SE		 245 ie_len_he_cap +
246 2 + 1 + sizeof(struct ieee80211_he_operation) +
d1b7524b 247 sizeof(struct ieee80211_he_6ghz_oper) +
24a2042c 248 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
df1875c4
RL		 249 ie_len_eht_cap +
250 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
251 offsetof(struct ieee80211_eht_operation_info, optional) +
3b69a9c5
TP		 252 2 + 8 + /* peering IE */
253 sdata->u.mesh.ie_len);
c3896d2c 254 if (!skb)
87d84c45 255 return err;
e7570dfb 256 info = IEEE80211_SKB_CB(skb);
65e8b0cc 257 skb_reserve(skb, local->tx_headroom);
b080db58 258 mgmt = skb_put_zero(skb, hdr_len);
e7827a70
HH		 259 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
260 IEEE80211_STYPE_ACTION);
c3896d2c 261 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 262 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 263 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 264 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
265 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 266
8db09850 267 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
21a8e9dd
MSS		 268 struct ieee80211_supported_band *sband;
269 enum nl80211_band band;
270
271 sband = ieee80211_get_sband(sdata);
272 if (!sband) {
273 err = -EINVAL;
274 goto free;
275 }
276 band = sband->band;
55de908a 277
8db09850 278 /* capability info */
e45a79da 279 pos = skb_put_zero(skb, 2);
54ef656b 280 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 281 /* AID */
282 pos = skb_put(skb, 2);
a69bd8e6 283 put_unaligned_le16(sta->sta.aid, pos);
c3896d2c 284 }
55de908a
JB		 285 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
286 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 287 mesh_add_rsn_ie(sdata, skb) ||
288 mesh_add_meshid_ie(sdata, skb) ||
289 mesh_add_meshconf_ie(sdata, skb))
f609a43d 290 goto free;
8db09850 291 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 292 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 293 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 294 goto free;
c3896d2c
LCC		 295 }
296
8db09850 297 /* Add Mesh Peering Management element */
c3896d2c 298 switch (action) {
54ef656b 299 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 300 break;
54ef656b 301 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 302 ie_len += 2;
c3896d2c
LCC		 303 include_plid = true;
304 break;
54ef656b 305 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 306 if (plid) {
307 ie_len += 2;
c3896d2c
LCC		 308 include_plid = true;
309 }
8db09850 310 ie_len += 2; /* reason code */
c3896d2c 311 break;
8db09850 312 default:
f609a43d
TP		 313 err = -EINVAL;
314 goto free;
c3896d2c
LCC		 315 }
316
8db09850 317 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 318 goto free;
8db09850 319
c3896d2c 320 pos = skb_put(skb, 2 + ie_len);
8db09850 321 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 322 *pos++ = ie_len;
8db09850
TP		 323 memcpy(pos, &peering_proto, 2);
324 pos += 2;
6f101ef0 325 put_unaligned_le16(llid, pos);
8db09850 326 pos += 2;
c3896d2c 327 if (include_plid) {
6f101ef0 328 put_unaligned_le16(plid, pos);
8db09850 329 pos += 2;
c3896d2c 330 }
54ef656b 331 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 332 put_unaligned_le16(reason, pos);
8db09850 333 pos += 2;
c3896d2c 334 }
176f3608
TP		 335
336 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d 337 if (mesh_add_ht_cap_ie(sdata, skb) ||
c85fb53c
BC		 338 mesh_add_ht_oper_ie(sdata, skb) ||
339 mesh_add_vht_cap_ie(sdata, skb) ||
60ad72da
SE		 340 mesh_add_vht_oper_ie(sdata, skb) ||
341 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
24a2042c 342 mesh_add_he_oper_ie(sdata, skb) ||
df1875c4
RL		 343 mesh_add_he_6ghz_cap_ie(sdata, skb) ||
344 mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
345 mesh_add_eht_oper_ie(sdata, skb))
f609a43d 346 goto free;
176f3608
TP		 347 }
348
bf7cd94d 349 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 350 goto free;
c3896d2c 351
62ae67be 352 ieee80211_tx_skb(sdata, skb);
c3896d2c 353 return 0;
f609a43d
TP		 354free:
355 kfree_skb(skb);
356 return err;
c3896d2c
LCC		 357}
358
fa87a656
BC		 359/**
360 * __mesh_plink_deactivate - deactivate mesh peer link
361 *
362 * @sta: mesh peer link to deactivate
363 *
e596af82
BC		 364 * Mesh paths with this peer as next hop should be flushed
365 * by the caller outside of plink_lock.
366 *
c00de1c4 367 * Returns: beacon changed flag if the beacon content changed.
fa87a656
BC		 368 *
369 * Locking: the caller must hold sta->mesh->plink_lock
370 */
15ddba5f 371static u64 __mesh_plink_deactivate(struct sta_info *sta)
fa87a656
BC		 372{
373 struct ieee80211_sub_if_data *sdata = sta->sdata;
15ddba5f 374 u64 changed = 0;
fa87a656
BC		 375
376 lockdep_assert_held(&sta->mesh->plink_lock);
377
378 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
379 changed = mesh_plink_dec_estab_count(sdata);
380 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
fa87a656
BC		 381
382 ieee80211_mps_sta_status_update(sta);
383 changed |= ieee80211_mps_set_sta_local_pm(sta,
384 NL80211_MESH_POWER_UNKNOWN);
385
386 return changed;
387}
388
389/**
390 * mesh_plink_deactivate - deactivate mesh peer link
391 *
392 * @sta: mesh peer link to deactivate
393 *
394 * All mesh paths with this peer as next hop will be flushed
c00de1c4
BB		 395 *
396 * Returns: beacon changed flag if the beacon content changed.
fa87a656 397 */
15ddba5f 398u64 mesh_plink_deactivate(struct sta_info *sta)
fa87a656
BC		 399{
400 struct ieee80211_sub_if_data *sdata = sta->sdata;
15ddba5f 401 u64 changed;
fa87a656
BC		 402
403 spin_lock_bh(&sta->mesh->plink_lock);
404 changed = __mesh_plink_deactivate(sta);
efc401f4
BC		 405
406 if (!sdata->u.mesh.user_mpm) {
407 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
408 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
409 sta->sta.addr, sta->mesh->llid,
410 sta->mesh->plid, sta->mesh->reason);
411 }
fa87a656 412 spin_unlock_bh(&sta->mesh->plink_lock);
efc401f4
BC		 413 if (!sdata->u.mesh.user_mpm)
414 del_timer_sync(&sta->mesh->plink_timer);
e596af82 415 mesh_path_flush_by_nexthop(sta);
fa87a656 416
efc401f4
BC		 417 /* make sure no readers can access nexthop sta from here on */
418 synchronize_net();
419
fa87a656
BC		 420 return changed;
421}
422
296fcba3
TP		 423static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
424 struct sta_info *sta,
1d6741d8 425 struct ieee802_11_elems *elems)
c3896d2c 426{
f698d856 427 struct ieee80211_local *local = sdata->local;
54ab1ffb 428 struct ieee80211_supported_band *sband;
f68d776a 429 u32 rates, basic_rates = 0, changed = 0;
046d2e7c 430 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
c3896d2c 431
21a8e9dd
MSS		 432 sband = ieee80211_get_sband(sdata);
433 if (!sband)
434 return;
435
436 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
437 &basic_rates);
d0709a65 438
433f5bc1 439 spin_lock_bh(&sta->mesh->plink_lock);
046d2e7c 440 sta->deflink.rx_stats.last_rx = jiffies;
296fcba3
TP		 441
442 /* rates and capabilities don't change during peering */
433f5bc1
JB		 443 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
444 sta->mesh->processed_beacon)
296fcba3 445 goto out;
433f5bc1 446 sta->mesh->processed_beacon = true;
bae35d92 447
046d2e7c 448 if (sta->sta.deflink.supp_rates[sband->band] != rates)
f68d776a 449 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
046d2e7c 450 sta->sta.deflink.supp_rates[sband->band] = rates;
54ab1ffb 451
52ac8c48 452 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
c71420db
JB		 453 elems->ht_cap_elem,
454 &sta->deflink))
52ac8c48 455 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 456
c85fb53c 457 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
084cf2ae 458 elems->vht_cap_elem, NULL,
c71420db 459 &sta->deflink);
c85fb53c 460
60ad72da 461 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
1bb9a8a4
JB		 462 elems->he_cap_len,
463 elems->he_6ghz_capa,
c71420db 464 &sta->deflink);
60ad72da 465
df1875c4
RL		 466 ieee80211_eht_cap_ie_to_sta_eht_cap(sdata, sband, elems->he_cap,
467 elems->he_cap_len,
468 elems->eht_cap, elems->eht_cap_len,
469 &sta->deflink);
470
046d2e7c 471 if (bw != sta->sta.deflink.bandwidth)
abcff6ef
JD		 472 changed |= IEEE80211_RC_BW_CHANGED;
473
52ac8c48
TP		 474 /* HT peer is operating 20MHz-only */
475 if (elems->ht_operation &&
476 !(elems->ht_operation->ht_param &
477 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
046d2e7c 478 if (sta->sta.deflink.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 479 changed |= IEEE80211_RC_BW_CHANGED;
046d2e7c 480 sta->sta.deflink.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 481 }
c7d25828 482
1d6741d8 483 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
59cf1d65 484 rate_control_rate_init(sta);
f68d776a 485 else
b4f85443 486 rate_control_rate_update(local, sband, sta, 0, changed);
296fcba3 487out:
433f5bc1 488 spin_unlock_bh(&sta->mesh->plink_lock);
296fcba3
TP		 489}
490
0e0060fc
BC		 491static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
492{
493 struct sta_info *sta;
494 unsigned long *aid_map;
495 int aid;
496
37babce9 497 aid_map = bitmap_zalloc(IEEE80211_MAX_AID + 1, GFP_KERNEL);
0e0060fc
BC		 498 if (!aid_map)
499 return -ENOMEM;
500
501 /* reserve aid 0 for mcast indication */
502 __set_bit(0, aid_map);
503
504 rcu_read_lock();
505 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
506 __set_bit(sta->sta.aid, aid_map);
507 rcu_read_unlock();
508
509 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
37babce9 510 bitmap_free(aid_map);
0e0060fc
BC		 511
512 if (aid > IEEE80211_MAX_AID)
513 return -ENOBUFS;
514
515 return aid;
516}
517
296fcba3
TP		 518static struct sta_info *
519__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
520{
521 struct sta_info *sta;
0e0060fc 522 int aid;
54ab1ffb 523
296fcba3 524 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 525 return NULL;
526
0e0060fc
BC		 527 aid = mesh_allocate_aid(sdata);
528 if (aid < 0)
529 return NULL;
530
f36fe0a2 531 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
296fcba3
TP		 532 if (!sta)
533 return NULL;
534
433f5bc1 535 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 536 sta->sta.wme = true;
0e0060fc 537 sta->sta.aid = aid;
296fcba3
TP		 538
539 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
540 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
541 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
542
296fcba3
TP		 543 return sta;
544}
545
546static struct sta_info *
547mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
ecbc12ad
BC		 548 struct ieee802_11_elems *elems,
549 struct ieee80211_rx_status *rx_status)
296fcba3
TP		 550{
551 struct sta_info *sta = NULL;
552
a6dad6a2
TP		 553 /* Userspace handles station allocation */
554 if (sdata->u.mesh.user_mpm ||
11197d00
MH		 555 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
556 if (mesh_peer_accepts_plinks(elems) &&
ecbc12ad
BC		 557 mesh_plink_availables(sdata)) {
558 int sig = 0;
559
560 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
561 sig = rx_status->signal;
562
11197d00
MH		 563 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
564 elems->ie_start,
565 elems->total_len,
ecbc12ad
BC		 566 sig, GFP_KERNEL);
567 }
11197d00 568 } else
296fcba3
TP		 569 sta = __mesh_sta_info_alloc(sdata, addr);
570
54ab1ffb
TP		 571 return sta;
572}
573
296fcba3
TP		 574/*
575 * mesh_sta_info_get - return mesh sta info entry for @addr.
576 *
577 * @sdata: local meshif
578 * @addr: peer's address
579 * @elems: IEs from beacon or mesh peering frame.
ecbc12ad 580 * @rx_status: rx status for the frame for signal reporting
296fcba3
TP		 581 *
582 * Return existing or newly allocated sta_info under RCU read lock.
583 * (re)initialize with given IEs.
584 */
585static struct sta_info *
586mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
ecbc12ad
BC		 587 u8 *addr, struct ieee802_11_elems *elems,
588 struct ieee80211_rx_status *rx_status) __acquires(RCU)
296fcba3
TP		 589{
590 struct sta_info *sta = NULL;
591
592 rcu_read_lock();
593 sta = sta_info_get(sdata, addr);
594 if (sta) {
1d6741d8 595 mesh_sta_info_init(sdata, sta, elems);
296fcba3
TP		 596 } else {
597 rcu_read_unlock();
598 /* can't run atomic */
ecbc12ad 599 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
296fcba3
TP		 600 if (!sta) {
601 rcu_read_lock();
602 return NULL;
603 }
604
1d6741d8 605 mesh_sta_info_init(sdata, sta, elems);
3b4797bc 606
296fcba3
TP		 607 if (sta_info_insert_rcu(sta))
608 return NULL;
609 }
610
611 return sta;
612}
613
614/*
615 * mesh_neighbour_update - update or initialize new mesh neighbor.
616 *
617 * @sdata: local meshif
618 * @addr: peer's address
619 * @elems: IEs from beacon or mesh peering frame
ecbc12ad 620 * @rx_status: rx status for the frame for signal reporting
296fcba3
TP		 621 *
622 * Initiates peering if appropriate.
623 */
f743ff49
TP		 624void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
625 u8 *hw_addr,
ecbc12ad
BC		 626 struct ieee802_11_elems *elems,
627 struct ieee80211_rx_status *rx_status)
54ab1ffb
TP		 628{
629 struct sta_info *sta;
15ddba5f 630 u64 changed = 0;
54ab1ffb 631
ecbc12ad 632 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
54ab1ffb
TP		 633 if (!sta)
634 goto out;
635
dbdaee7a
BC		 636 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
637 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
638
1570ca59 639 if (mesh_peer_accepts_plinks(elems) &&
433f5bc1 640 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
54ab1ffb
TP		 641 sdata->u.mesh.accepting_plinks &&
642 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 643 rssi_threshold_check(sdata, sta))
39886b61 644 changed = mesh_plink_open(sta);
c3896d2c 645
3f52b7e3 646 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 647out:
d0709a65 648 rcu_read_unlock();
2b5e1967 649 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 650}
651
4c02d62f 652void mesh_plink_timer(struct timer_list *t)
c3896d2c 653{
4c02d62f 654 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
c3896d2c 655 struct sta_info *sta;
6f101ef0 656 u16 reason = 0;
c3896d2c 657 struct ieee80211_sub_if_data *sdata;
453e66f2 658 struct mesh_config *mshcfg;
4efec451 659 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 660
d0709a65
JB		 661 /*
662 * This STA is valid because sta_info_destroy() will
663 * del_timer_sync() this timer after having made sure
664 * it cannot be readded (by deleting the plink.)
665 */
4c02d62f 666 sta = mesh->plink_sta;
c3896d2c 667
690205f1 668 if (sta->sdata->local->quiescing)
5bb644a0 669 return;
5bb644a0 670
433f5bc1 671 spin_lock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 672
673 /* If a timer fires just before a state transition on another CPU,
674 * we may have already extended the timeout and changed state by the
675 * time we've acquired the lock and arrived here. In that case,
676 * skip this timer and wait for the new one.
677 */
433f5bc1 678 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
2b470c39
BC		 679 mpl_dbg(sta->sdata,
680 "Ignoring timer for %pM in state %s (timer adjusted)",
433f5bc1
JB		 681 sta->sta.addr, mplstates[sta->mesh->plink_state]);
682 spin_unlock_bh(&sta->mesh->plink_lock);
c3896d2c
LCC		 683 return;
684 }
2b470c39
BC		 685
686 /* del_timer() and handler may race when entering these states */
433f5bc1
JB		 687 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
688 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
2b470c39
BC		 689 mpl_dbg(sta->sdata,
690 "Ignoring timer for %pM in state %s (timer deleted)",
433f5bc1
JB		 691 sta->sta.addr, mplstates[sta->mesh->plink_state]);
692 spin_unlock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 693 return;
694 }
695
bdcbd8e0 696 mpl_dbg(sta->sdata,
3088f7d2 697 "Mesh plink timer for %pM fired on state %s\n",
433f5bc1 698 sta->sta.addr, mplstates[sta->mesh->plink_state]);
d0709a65 699 sdata = sta->sdata;
453e66f2 700 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c 701
433f5bc1 702 switch (sta->mesh->plink_state) {
57cf8043
JC		 703 case NL80211_PLINK_OPN_RCVD:
704 case NL80211_PLINK_OPN_SNT:
c3896d2c 705 /* retry timer */
433f5bc1 706 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 707 u32 rand;
bdcbd8e0
JB		 708 mpl_dbg(sta->sdata,
709 "Mesh plink for %pM (retry, timeout): %d %d\n",
433f5bc1
JB		 710 sta->sta.addr, sta->mesh->plink_retries,
711 sta->mesh->plink_timeout);
c3896d2c 712 get_random_bytes(&rand, sizeof(u32));
433f5bc1
JB		 713 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
714 rand % sta->mesh->plink_timeout;
715 ++sta->mesh->plink_retries;
716 mod_plink_timer(sta, sta->mesh->plink_timeout);
4efec451 717 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 718 break;
719 }
6f101ef0 720 reason = WLAN_REASON_MESH_MAX_RETRIES;
fc0561dc 721 fallthrough;
57cf8043 722 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 723 /* confirm timer */
724 if (!reason)
6f101ef0 725 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
433f5bc1 726 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
453e66f2 727 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 728 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 729 break;
57cf8043 730 case NL80211_PLINK_HOLDING:
c3896d2c 731 /* holding timer */
433f5bc1 732 del_timer(&sta->mesh->plink_timer);
c3896d2c 733 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 734 break;
735 default:
c3896d2c
LCC		 736 break;
737 }
433f5bc1 738 spin_unlock_bh(&sta->mesh->plink_lock);
4efec451 739 if (action)
a69bd8e6 740 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1 741 sta->mesh->llid, sta->mesh->plid, reason);
c3896d2c
LCC		 742}
743
0df2f6c1 744static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 745{
433f5bc1 746 sta->mesh->plink_timeout = timeout;
4c02d62f 747 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
c3896d2c
LCC		 748}
749
204d1304 750static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 751 u16 llid)
204d1304
TP		 752{
753 struct ieee80211_local *local = sdata->local;
754 bool in_use = false;
755 struct sta_info *sta;
756
757 rcu_read_lock();
758 list_for_each_entry_rcu(sta, &local->sta_list, list) {
520c75dc
MS		 759 if (sdata != sta->sdata)
760 continue;
761
433f5bc1 762 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
204d1304
TP		 763 in_use = true;
764 break;
765 }
766 }
767 rcu_read_unlock();
768
769 return in_use;
770}
771
6f101ef0 772static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 773{
774 u16 llid;
775
776 do {
777 get_random_bytes(&llid, sizeof(llid));
6f101ef0 778 } while (llid_in_use(sdata, llid));
204d1304 779
6f101ef0 780 return llid;
204d1304
TP		 781}
782
15ddba5f 783u64 mesh_plink_open(struct sta_info *sta)
c3896d2c 784{
d0709a65 785 struct ieee80211_sub_if_data *sdata = sta->sdata;
15ddba5f 786 u64 changed;
c3896d2c 787
c2c98fde 788 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 789 return 0;
53e80511 790
433f5bc1
JB		 791 spin_lock_bh(&sta->mesh->plink_lock);
792 sta->mesh->llid = mesh_get_new_llid(sdata);
793 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
794 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
795 spin_unlock_bh(&sta->mesh->plink_lock);
39886b61 796 return 0;
c3896d2c 797 }
433f5bc1 798 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 799 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
433f5bc1 800 spin_unlock_bh(&sta->mesh->plink_lock);
bdcbd8e0
JB		 801 mpl_dbg(sdata,
802 "Mesh plink: starting establishment with %pM\n",
0c68ae26 803 sta->sta.addr);
c3896d2c 804
3f52b7e3 805 /* set the non-peer mode to active during peering */
39886b61 806 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 807
a69bd8e6 808 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
433f5bc1 809 sta->sta.addr, sta->mesh->llid, 0, 0);
39886b61 810 return changed;
c3896d2c
LCC		 811}
812
15ddba5f 813u64 mesh_plink_block(struct sta_info *sta)
c3896d2c 814{
15ddba5f 815 u64 changed;
c9370197 816
433f5bc1 817 spin_lock_bh(&sta->mesh->plink_lock);
df323818 818 changed = __mesh_plink_deactivate(sta);
433f5bc1
JB		 819 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
820 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82 821 mesh_path_flush_by_nexthop(sta);
c9370197 822
39886b61 823 return changed;
c3896d2c
LCC		 824}
825
e76d67f0
BC		 826static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
827 struct sta_info *sta,
828 enum plink_event event)
829{
830 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
6f101ef0
CYY		 831 u16 reason = (event == CLS_ACPT) ?
832 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0 833
433f5bc1
JB		 834 sta->mesh->reason = reason;
835 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
272a9e26 836 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 837}
838
15ddba5f 839static u64 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
e76d67f0
BC		 840 struct sta_info *sta)
841{
842 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
15ddba5f 843 u64 changed = 0;
e76d67f0 844
433f5bc1
JB		 845 del_timer(&sta->mesh->plink_timer);
846 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
e76d67f0
BC		 847 changed |= mesh_plink_inc_estab_count(sdata);
848 changed |= mesh_set_ht_prot_mode(sdata);
849 changed |= mesh_set_short_slot_time(sdata);
850 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
851 ieee80211_mps_sta_status_update(sta);
852 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
853 return changed;
854}
855
c7e67811
TP		 856/**
857 * mesh_plink_fsm - step @sta MPM based on @event
858 *
859 * @sdata: interface
860 * @sta: mesh neighbor
861 * @event: peering event
862 *
863 * Return: changed MBSS flags
864 */
15ddba5f 865static u64 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
c7e67811
TP		 866 struct sta_info *sta, enum plink_event event)
867{
868 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
869 enum ieee80211_self_protected_actioncode action = 0;
15ddba5f 870 u64 changed = 0;
e596af82 871 bool flush = false;
c7e67811
TP		 872
873 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
433f5bc1 874 mplstates[sta->mesh->plink_state], mplevents[event]);
c7e67811 875
433f5bc1
JB		 876 spin_lock_bh(&sta->mesh->plink_lock);
877 switch (sta->mesh->plink_state) {
c7e67811
TP		 878 case NL80211_PLINK_LISTEN:
879 switch (event) {
880 case CLS_ACPT:
881 mesh_plink_fsm_restart(sta);
882 break;
883 case OPN_ACPT:
433f5bc1
JB		 884 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
885 sta->mesh->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 886 mesh_plink_timer_set(sta,
887 mshcfg->dot11MeshRetryTimeout);
888
889 /* set the non-peer mode to active during peering */
890 changed |= ieee80211_mps_local_status_update(sdata);
891 action = WLAN_SP_MESH_PEERING_OPEN;
892 break;
893 default:
894 break;
895 }
896 break;
897 case NL80211_PLINK_OPN_SNT:
898 switch (event) {
899 case OPN_RJCT:
900 case CNF_RJCT:
901 case CLS_ACPT:
902 mesh_plink_close(sdata, sta, event);
903 action = WLAN_SP_MESH_PEERING_CLOSE;
904 break;
905 case OPN_ACPT:
906 /* retry timer is left untouched */
433f5bc1 907 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
c7e67811
TP		 908 action = WLAN_SP_MESH_PEERING_CONFIRM;
909 break;
910 case CNF_ACPT:
433f5bc1 911 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 912 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 913 break;
914 default:
915 break;
916 }
917 break;
918 case NL80211_PLINK_OPN_RCVD:
919 switch (event) {
920 case OPN_RJCT:
921 case CNF_RJCT:
922 case CLS_ACPT:
923 mesh_plink_close(sdata, sta, event);
924 action = WLAN_SP_MESH_PEERING_CLOSE;
925 break;
926 case OPN_ACPT:
927 action = WLAN_SP_MESH_PEERING_CONFIRM;
928 break;
929 case CNF_ACPT:
930 changed |= mesh_plink_establish(sdata, sta);
931 break;
932 default:
933 break;
934 }
935 break;
936 case NL80211_PLINK_CNF_RCVD:
937 switch (event) {
938 case OPN_RJCT:
939 case CNF_RJCT:
940 case CLS_ACPT:
941 mesh_plink_close(sdata, sta, event);
942 action = WLAN_SP_MESH_PEERING_CLOSE;
943 break;
944 case OPN_ACPT:
945 changed |= mesh_plink_establish(sdata, sta);
946 action = WLAN_SP_MESH_PEERING_CONFIRM;
947 break;
948 default:
949 break;
950 }
951 break;
952 case NL80211_PLINK_ESTAB:
953 switch (event) {
954 case CLS_ACPT:
955 changed |= __mesh_plink_deactivate(sta);
956 changed |= mesh_set_ht_prot_mode(sdata);
957 changed |= mesh_set_short_slot_time(sdata);
958 mesh_plink_close(sdata, sta, event);
959 action = WLAN_SP_MESH_PEERING_CLOSE;
e596af82 960 flush = true;
c7e67811
TP		 961 break;
962 case OPN_ACPT:
963 action = WLAN_SP_MESH_PEERING_CONFIRM;
964 break;
965 default:
966 break;
967 }
968 break;
969 case NL80211_PLINK_HOLDING:
970 switch (event) {
971 case CLS_ACPT:
433f5bc1 972 del_timer(&sta->mesh->plink_timer);
c7e67811
TP		 973 mesh_plink_fsm_restart(sta);
974 break;
975 case OPN_ACPT:
976 case CNF_ACPT:
977 case OPN_RJCT:
978 case CNF_RJCT:
979 action = WLAN_SP_MESH_PEERING_CLOSE;
980 break;
981 default:
982 break;
983 }
984 break;
985 default:
986 /* should not get here, PLINK_BLOCKED is dealt with at the
987 * beginning of the function
988 */
989 break;
990 }
433f5bc1 991 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82
BC		 992 if (flush)
993 mesh_path_flush_by_nexthop(sta);
c7e67811 994 if (action) {
a69bd8e6 995 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1
JB		 996 sta->mesh->llid, sta->mesh->plid,
997 sta->mesh->reason);
c7e67811
TP		 998
999 /* also send confirm in open case */
1000 if (action == WLAN_SP_MESH_PEERING_OPEN) {
a69bd8e6 1001 mesh_plink_frame_tx(sdata, sta,
c7e67811 1002 WLAN_SP_MESH_PEERING_CONFIRM,
433f5bc1
JB		 1003 sta->sta.addr, sta->mesh->llid,
1004 sta->mesh->plid, 0);
c7e67811
TP		 1005 }
1006 }
1007
1008 return changed;
1009}
1010
c99a89ed
TP		 1011/*
1012 * mesh_plink_get_event - get correct MPM event
1013 *
1014 * @sdata: interface
1015 * @sta: peer, leave NULL if processing a frame from a new suitable peer
1016 * @elems: peering management IEs
1017 * @ftype: frame type
1018 * @llid: peer's peer link ID
1019 * @plid: peer's local link ID
1020 *
1021 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1022 * an error.
1023 */
1024static enum plink_event
1025mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1026 struct sta_info *sta,
1027 struct ieee802_11_elems *elems,
1028 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 1029 u16 llid, u16 plid)
c99a89ed
TP		 1030{
1031 enum plink_event event = PLINK_UNDEFINED;
1032 u8 ie_len = elems->peering_len;
1033 bool matches_local;
1034
1035 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1036 mesh_matches_local(sdata, elems));
1037
1038 /* deny open request from non-matching peer */
1039 if (!matches_local && !sta) {
1040 event = OPN_RJCT;
1041 goto out;
1042 }
1043
1044 if (!sta) {
1045 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1046 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1047 goto out;
1048 }
1049 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1050 if (!mesh_plink_free_count(sdata)) {
1051 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1052 goto out;
1053 }
b8631c00
SS		 1054
1055 /* new matching peer */
1056 event = OPN_ACPT;
1057 goto out;
c99a89ed
TP		 1058 } else {
1059 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1060 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1061 goto out;
1062 }
433f5bc1 1063 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
c99a89ed
TP		 1064 goto out;
1065 }
1066
c99a89ed
TP		 1067 switch (ftype) {
1068 case WLAN_SP_MESH_PEERING_OPEN:
1069 if (!matches_local)
1070 event = OPN_RJCT;
1071 if (!mesh_plink_free_count(sdata) ||
433f5bc1 1072 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1073 event = OPN_IGNR;
1074 else
1075 event = OPN_ACPT;
1076 break;
1077 case WLAN_SP_MESH_PEERING_CONFIRM:
1078 if (!matches_local)
1079 event = CNF_RJCT;
1080 if (!mesh_plink_free_count(sdata) ||
433f5bc1
JB		 1081 sta->mesh->llid != llid ||
1082 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1083 event = CNF_IGNR;
1084 else
1085 event = CNF_ACPT;
1086 break;
1087 case WLAN_SP_MESH_PEERING_CLOSE:
433f5bc1 1088 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
c99a89ed
TP		 1089 /* Do not check for llid or plid. This does not
1090 * follow the standard but since multiple plinks
1091 * per sta are not supported, it is necessary in
1092 * order to avoid a livelock when MP A sees an
1093 * establish peer link to MP B but MP B does not
1094 * see it. This can be caused by a timeout in
1095 * B's peer link establishment or B beign
1096 * restarted.
1097 */
1098 event = CLS_ACPT;
433f5bc1 1099 else if (sta->mesh->plid != plid)
c99a89ed 1100 event = CLS_IGNR;
433f5bc1 1101 else if (ie_len == 8 && sta->mesh->llid != llid)
c99a89ed
TP		 1102 event = CLS_IGNR;
1103 else
1104 event = CLS_ACPT;
1105 break;
1106 default:
1107 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1108 break;
1109 }
1110
1111out:
1112 return event;
1113}
1114
05a23ae9
TP		 1115static void
1116mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1117 struct ieee80211_mgmt *mgmt,
ecbc12ad
BC		 1118 struct ieee802_11_elems *elems,
1119 struct ieee80211_rx_status *rx_status)
c3896d2c 1120{
05a23ae9 1121
c3896d2c
LCC		 1122 struct sta_info *sta;
1123 enum plink_event event;
54ef656b 1124 enum ieee80211_self_protected_actioncode ftype;
15ddba5f 1125 u64 changed = 0;
c99a89ed 1126 u8 ie_len = elems->peering_len;
6f101ef0 1127 u16 plid, llid = 0;
c3896d2c 1128
05a23ae9 1129 if (!elems->peering) {
bdcbd8e0
JB		 1130 mpl_dbg(sdata,
1131 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1132 return;
1133 }
bf7cd94d 1134
05a23ae9 1135 if (elems->rsn_len &&
bf7cd94d 1136 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1137 mpl_dbg(sdata,
1138 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1139 return;
1140 }
c3896d2c 1141
8db09850 1142 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1143 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1144 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1145 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1146 && ie_len != 8)) {
bdcbd8e0
JB		 1147 mpl_dbg(sdata,
1148 "Mesh plink: incorrect plink ie length %d %d\n",
1149 ftype, ie_len);
c3896d2c
LCC		 1150 return;
1151 }
1152
54ef656b 1153 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1154 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1155 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1156 return;
1157 }
1158 /* Note the lines below are correct, the llid in the frame is the plid
1159 * from the point of view of this host.
1160 */
f8134fed 1161 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1162 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1163 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1164 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1165
296fcba3 1166 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1167 rcu_read_lock();
1168
abe60632 1169 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1170
55335137 1171 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1172 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1173 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1174 mgmt->sa);
fc10302e 1175 goto unlock_rcu;
55335137
AN		 1176 }
1177
c3896d2c 1178 /* Now we will figure out the appropriate event... */
c99a89ed 1179 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1180
1181 if (event == OPN_ACPT) {
296fcba3 1182 rcu_read_unlock();
54ab1ffb 1183 /* allocate sta entry if necessary and update info */
ecbc12ad 1184 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
54ab1ffb 1185 if (!sta) {
bdcbd8e0 1186 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1187 goto unlock_rcu;
54ab1ffb 1188 }
433f5bc1 1189 sta->mesh->plid = plid;
c99a89ed 1190 } else if (!sta && event == OPN_RJCT) {
a69bd8e6 1191 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
c99a89ed 1192 mgmt->sa, 0, plid,
6f101ef0 1193 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1194 goto unlock_rcu;
1195 } else if (!sta || event == PLINK_UNDEFINED) {
1196 /* something went wrong */
1197 goto unlock_rcu;
c3896d2c
LCC		 1198 }
1199
a69bd8e6
BC		 1200 if (event == CNF_ACPT) {
1201 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
0e0060fc 1202 if (!sta->mesh->plid)
a69bd8e6 1203 sta->mesh->plid = plid;
a69bd8e6
BC		 1204
1205 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1206 }
6c6fa496 1207
c7e67811 1208 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1209
fc10302e 1210unlock_rcu:
d0709a65 1211 rcu_read_unlock();
57aac7c5 1212
ecccd072 1213 if (changed)
2b5e1967 1214 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1215}
05a23ae9
TP		 1216
1217void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1218 struct ieee80211_mgmt *mgmt, size_t len,
1219 struct ieee80211_rx_status *rx_status)
1220{
5d24828d 1221 struct ieee802_11_elems *elems;
05a23ae9
TP		 1222 size_t baselen;
1223 u8 *baseaddr;
1224
1225 /* need action_code, aux */
1226 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1227 return;
1228
1229 if (sdata->u.mesh.user_mpm)
1230 /* userspace must register for these */
1231 return;
1232
1233 if (is_multicast_ether_addr(mgmt->da)) {
1234 mpl_dbg(sdata,
1235 "Mesh plink: ignore frame from multicast address\n");
1236 return;
1237 }
1238
1239 baseaddr = mgmt->u.action.u.self_prot.variable;
1240 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1241 if (mgmt->u.action.u.self_prot.action_code ==
1242 WLAN_SP_MESH_PEERING_CONFIRM) {
1243 baseaddr += 4;
1244 baselen += 4;
b3e7de87
BC		 1245
1246 if (baselen > len)
1247 return;
05a23ae9 1248 }
38c6aa29 1249 elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL);
5d24828d
JB		 1250 mesh_process_plink_frame(sdata, mgmt, elems, rx_status);
1251 kfree(elems);
05a23ae9 1252}
Linux 6.x block layer and io_uring tree(s)