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Merge tag 'riscv-for-linus-6.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel...
[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.
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;
996c15bd 267 u32 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 282
147ceae2
JB		 283 basic_rates = sdata->vif.bss_conf.basic_rates;
284
285 if (ieee80211_put_srates_elem(skb, sband, basic_rates,
996c15bd 286 0, WLAN_EID_SUPP_RATES) ||
147ceae2 287 ieee80211_put_srates_elem(skb, sband, basic_rates,
996c15bd 288 0, WLAN_EID_EXT_SUPP_RATES) ||
bf7cd94d
JB		 289 mesh_add_rsn_ie(sdata, skb) ||
290 mesh_add_meshid_ie(sdata, skb) ||
291 mesh_add_meshconf_ie(sdata, skb))
f609a43d 292 goto free;
8db09850 293 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 294 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 295 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 296 goto free;
c3896d2c
LCC		 297 }
298
8db09850 299 /* Add Mesh Peering Management element */
c3896d2c 300 switch (action) {
54ef656b 301 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 302 break;
54ef656b 303 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 304 ie_len += 2;
c3896d2c
LCC		 305 include_plid = true;
306 break;
54ef656b 307 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 308 if (plid) {
309 ie_len += 2;
c3896d2c
LCC		 310 include_plid = true;
311 }
8db09850 312 ie_len += 2; /* reason code */
c3896d2c 313 break;
8db09850 314 default:
f609a43d
TP		 315 err = -EINVAL;
316 goto free;
c3896d2c
LCC		 317 }
318
8db09850 319 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 320 goto free;
8db09850 321
c3896d2c 322 pos = skb_put(skb, 2 + ie_len);
8db09850 323 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 324 *pos++ = ie_len;
8db09850
TP		 325 memcpy(pos, &peering_proto, 2);
326 pos += 2;
6f101ef0 327 put_unaligned_le16(llid, pos);
8db09850 328 pos += 2;
c3896d2c 329 if (include_plid) {
6f101ef0 330 put_unaligned_le16(plid, pos);
8db09850 331 pos += 2;
c3896d2c 332 }
54ef656b 333 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 334 put_unaligned_le16(reason, pos);
8db09850 335 pos += 2;
c3896d2c 336 }
176f3608
TP		 337
338 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d 339 if (mesh_add_ht_cap_ie(sdata, skb) ||
c85fb53c
BC		 340 mesh_add_ht_oper_ie(sdata, skb) ||
341 mesh_add_vht_cap_ie(sdata, skb) ||
60ad72da
SE		 342 mesh_add_vht_oper_ie(sdata, skb) ||
343 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
24a2042c 344 mesh_add_he_oper_ie(sdata, skb) ||
df1875c4
RL		 345 mesh_add_he_6ghz_cap_ie(sdata, skb) ||
346 mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
347 mesh_add_eht_oper_ie(sdata, skb))
f609a43d 348 goto free;
176f3608
TP		 349 }
350
bf7cd94d 351 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 352 goto free;
c3896d2c 353
62ae67be 354 ieee80211_tx_skb(sdata, skb);
c3896d2c 355 return 0;
f609a43d
TP		 356free:
357 kfree_skb(skb);
358 return err;
c3896d2c
LCC		 359}
360
fa87a656
BC		 361/**
362 * __mesh_plink_deactivate - deactivate mesh peer link
363 *
364 * @sta: mesh peer link to deactivate
365 *
e596af82
BC		 366 * Mesh paths with this peer as next hop should be flushed
367 * by the caller outside of plink_lock.
368 *
c00de1c4 369 * Returns: beacon changed flag if the beacon content changed.
fa87a656
BC		 370 *
371 * Locking: the caller must hold sta->mesh->plink_lock
372 */
15ddba5f 373static u64 __mesh_plink_deactivate(struct sta_info *sta)
fa87a656
BC		 374{
375 struct ieee80211_sub_if_data *sdata = sta->sdata;
15ddba5f 376 u64 changed = 0;
fa87a656
BC		 377
378 lockdep_assert_held(&sta->mesh->plink_lock);
379
380 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
381 changed = mesh_plink_dec_estab_count(sdata);
382 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
fa87a656
BC		 383
384 ieee80211_mps_sta_status_update(sta);
385 changed |= ieee80211_mps_set_sta_local_pm(sta,
386 NL80211_MESH_POWER_UNKNOWN);
387
388 return changed;
389}
390
391/**
392 * mesh_plink_deactivate - deactivate mesh peer link
393 *
394 * @sta: mesh peer link to deactivate
395 *
396 * All mesh paths with this peer as next hop will be flushed
c00de1c4
BB		 397 *
398 * Returns: beacon changed flag if the beacon content changed.
fa87a656 399 */
15ddba5f 400u64 mesh_plink_deactivate(struct sta_info *sta)
fa87a656
BC		 401{
402 struct ieee80211_sub_if_data *sdata = sta->sdata;
15ddba5f 403 u64 changed;
fa87a656
BC		 404
405 spin_lock_bh(&sta->mesh->plink_lock);
406 changed = __mesh_plink_deactivate(sta);
efc401f4
BC		 407
408 if (!sdata->u.mesh.user_mpm) {
409 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
410 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
411 sta->sta.addr, sta->mesh->llid,
412 sta->mesh->plid, sta->mesh->reason);
413 }
fa87a656 414 spin_unlock_bh(&sta->mesh->plink_lock);
efc401f4 415 if (!sdata->u.mesh.user_mpm)
8fa7292f 416 timer_delete_sync(&sta->mesh->plink_timer);
e596af82 417 mesh_path_flush_by_nexthop(sta);
fa87a656 418
efc401f4
BC		 419 /* make sure no readers can access nexthop sta from here on */
420 synchronize_net();
421
fa87a656
BC		 422 return changed;
423}
424
296fcba3
TP		 425static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
426 struct sta_info *sta,
1d6741d8 427 struct ieee802_11_elems *elems)
c3896d2c 428{
f698d856 429 struct ieee80211_local *local = sdata->local;
54ab1ffb 430 struct ieee80211_supported_band *sband;
c30e9a85 431 u32 rates, changed = 0;
046d2e7c 432 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
c3896d2c 433
21a8e9dd
MSS		 434 sband = ieee80211_get_sband(sdata);
435 if (!sband)
436 return;
437
c30e9a85 438 rates = ieee80211_sta_get_rates(sdata, elems, sband->band, NULL);
d0709a65 439
433f5bc1 440 spin_lock_bh(&sta->mesh->plink_lock);
046d2e7c 441 sta->deflink.rx_stats.last_rx = jiffies;
296fcba3
TP		 442
443 /* rates and capabilities don't change during peering */
433f5bc1
JB		 444 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
445 sta->mesh->processed_beacon)
296fcba3 446 goto out;
433f5bc1 447 sta->mesh->processed_beacon = true;
bae35d92 448
046d2e7c 449 if (sta->sta.deflink.supp_rates[sband->band] != rates)
f68d776a 450 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
046d2e7c 451 sta->sta.deflink.supp_rates[sband->band] = rates;
54ab1ffb 452
52ac8c48 453 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
c71420db
JB		 454 elems->ht_cap_elem,
455 &sta->deflink))
52ac8c48 456 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 457
c85fb53c 458 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
084cf2ae 459 elems->vht_cap_elem, NULL,
c71420db 460 &sta->deflink);
c85fb53c 461
60ad72da 462 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
1bb9a8a4
JB		 463 elems->he_cap_len,
464 elems->he_6ghz_capa,
c71420db 465 &sta->deflink);
60ad72da 466
df1875c4
RL		 467 ieee80211_eht_cap_ie_to_sta_eht_cap(sdata, sband, elems->he_cap,
468 elems->he_cap_len,
469 elems->eht_cap, elems->eht_cap_len,
470 &sta->deflink);
471
046d2e7c 472 if (bw != sta->sta.deflink.bandwidth)
abcff6ef
JD		 473 changed |= IEEE80211_RC_BW_CHANGED;
474
52ac8c48
TP		 475 /* HT peer is operating 20MHz-only */
476 if (elems->ht_operation &&
477 !(elems->ht_operation->ht_param &
478 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
046d2e7c 479 if (sta->sta.deflink.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 480 changed |= IEEE80211_RC_BW_CHANGED;
046d2e7c 481 sta->sta.deflink.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 482 }
c7d25828 483
88b67e91 484 /* FIXME: this check is wrong without SW rate control */
1d6741d8 485 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
f828deb7 486 rate_control_rate_init(&sta->deflink);
f68d776a 487 else
88b67e91 488 rate_control_rate_update(local, sband, &sta->deflink, changed);
296fcba3 489out:
433f5bc1 490 spin_unlock_bh(&sta->mesh->plink_lock);
296fcba3
TP		 491}
492
0e0060fc
BC		 493static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
494{
495 struct sta_info *sta;
496 unsigned long *aid_map;
497 int aid;
498
37babce9 499 aid_map = bitmap_zalloc(IEEE80211_MAX_AID + 1, GFP_KERNEL);
0e0060fc
BC		 500 if (!aid_map)
501 return -ENOMEM;
502
503 /* reserve aid 0 for mcast indication */
504 __set_bit(0, aid_map);
505
506 rcu_read_lock();
507 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
508 __set_bit(sta->sta.aid, aid_map);
509 rcu_read_unlock();
510
511 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
37babce9 512 bitmap_free(aid_map);
0e0060fc
BC		 513
514 if (aid > IEEE80211_MAX_AID)
515 return -ENOBUFS;
516
517 return aid;
518}
519
296fcba3
TP		 520static struct sta_info *
521__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
522{
523 struct sta_info *sta;
0e0060fc 524 int aid;
54ab1ffb 525
296fcba3 526 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 527 return NULL;
528
0e0060fc
BC		 529 aid = mesh_allocate_aid(sdata);
530 if (aid < 0)
531 return NULL;
532
f36fe0a2 533 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
296fcba3
TP		 534 if (!sta)
535 return NULL;
536
433f5bc1 537 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 538 sta->sta.wme = true;
0e0060fc 539 sta->sta.aid = aid;
296fcba3
TP		 540
541 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
542 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
543 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
544
296fcba3
TP		 545 return sta;
546}
547
548static struct sta_info *
549mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
ecbc12ad
BC		 550 struct ieee802_11_elems *elems,
551 struct ieee80211_rx_status *rx_status)
296fcba3
TP		 552{
553 struct sta_info *sta = NULL;
554
a6dad6a2
TP		 555 /* Userspace handles station allocation */
556 if (sdata->u.mesh.user_mpm ||
11197d00
MH		 557 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
558 if (mesh_peer_accepts_plinks(elems) &&
ecbc12ad
BC		 559 mesh_plink_availables(sdata)) {
560 int sig = 0;
561
562 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
563 sig = rx_status->signal;
564
11197d00
MH		 565 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
566 elems->ie_start,
567 elems->total_len,
ecbc12ad
BC		 568 sig, GFP_KERNEL);
569 }
11197d00 570 } else
296fcba3
TP		 571 sta = __mesh_sta_info_alloc(sdata, addr);
572
54ab1ffb
TP		 573 return sta;
574}
575
296fcba3
TP		 576/*
577 * mesh_sta_info_get - return mesh sta info entry for @addr.
578 *
579 * @sdata: local meshif
580 * @addr: peer's address
581 * @elems: IEs from beacon or mesh peering frame.
ecbc12ad 582 * @rx_status: rx status for the frame for signal reporting
296fcba3
TP		 583 *
584 * Return existing or newly allocated sta_info under RCU read lock.
585 * (re)initialize with given IEs.
586 */
587static struct sta_info *
588mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
ecbc12ad
BC		 589 u8 *addr, struct ieee802_11_elems *elems,
590 struct ieee80211_rx_status *rx_status) __acquires(RCU)
296fcba3
TP		 591{
592 struct sta_info *sta = NULL;
593
594 rcu_read_lock();
595 sta = sta_info_get(sdata, addr);
596 if (sta) {
1d6741d8 597 mesh_sta_info_init(sdata, sta, elems);
296fcba3
TP		 598 } else {
599 rcu_read_unlock();
600 /* can't run atomic */
ecbc12ad 601 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
296fcba3
TP		 602 if (!sta) {
603 rcu_read_lock();
604 return NULL;
605 }
606
1d6741d8 607 mesh_sta_info_init(sdata, sta, elems);
3b4797bc 608
296fcba3
TP		 609 if (sta_info_insert_rcu(sta))
610 return NULL;
611 }
612
613 return sta;
614}
615
616/*
617 * mesh_neighbour_update - update or initialize new mesh neighbor.
618 *
619 * @sdata: local meshif
620 * @addr: peer's address
621 * @elems: IEs from beacon or mesh peering frame
ecbc12ad 622 * @rx_status: rx status for the frame for signal reporting
296fcba3
TP		 623 *
624 * Initiates peering if appropriate.
625 */
f743ff49
TP		 626void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
627 u8 *hw_addr,
ecbc12ad
BC		 628 struct ieee802_11_elems *elems,
629 struct ieee80211_rx_status *rx_status)
54ab1ffb
TP		 630{
631 struct sta_info *sta;
15ddba5f 632 u64 changed = 0;
54ab1ffb 633
ecbc12ad 634 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
54ab1ffb
TP		 635 if (!sta)
636 goto out;
637
dbdaee7a
BC		 638 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
639 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
640
1570ca59 641 if (mesh_peer_accepts_plinks(elems) &&
433f5bc1 642 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
54ab1ffb
TP		 643 sdata->u.mesh.accepting_plinks &&
644 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 645 rssi_threshold_check(sdata, sta))
39886b61 646 changed = mesh_plink_open(sta);
c3896d2c 647
3f52b7e3 648 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 649out:
d0709a65 650 rcu_read_unlock();
2b5e1967 651 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 652}
653
4c02d62f 654void mesh_plink_timer(struct timer_list *t)
c3896d2c 655{
41cb0855 656 struct mesh_sta *mesh = timer_container_of(mesh, t, plink_timer);
c3896d2c 657 struct sta_info *sta;
6f101ef0 658 u16 reason = 0;
c3896d2c 659 struct ieee80211_sub_if_data *sdata;
453e66f2 660 struct mesh_config *mshcfg;
4efec451 661 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 662
d0709a65
JB		 663 /*
664 * This STA is valid because sta_info_destroy() will
8fa7292f 665 * timer_delete_sync() this timer after having made sure
4b482281 666 * it cannot be re-added (by deleting the plink.)
d0709a65 667 */
4c02d62f 668 sta = mesh->plink_sta;
c3896d2c 669
690205f1 670 if (sta->sdata->local->quiescing)
5bb644a0 671 return;
5bb644a0 672
433f5bc1 673 spin_lock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 674
675 /* If a timer fires just before a state transition on another CPU,
676 * we may have already extended the timeout and changed state by the
677 * time we've acquired the lock and arrived here. In that case,
678 * skip this timer and wait for the new one.
679 */
433f5bc1 680 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
2b470c39
BC		 681 mpl_dbg(sta->sdata,
682 "Ignoring timer for %pM in state %s (timer adjusted)",
433f5bc1
JB		 683 sta->sta.addr, mplstates[sta->mesh->plink_state]);
684 spin_unlock_bh(&sta->mesh->plink_lock);
c3896d2c
LCC		 685 return;
686 }
2b470c39 687
8fa7292f 688 /* timer_delete() and handler may race when entering these states */
433f5bc1
JB		 689 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
690 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
2b470c39
BC		 691 mpl_dbg(sta->sdata,
692 "Ignoring timer for %pM in state %s (timer deleted)",
433f5bc1
JB		 693 sta->sta.addr, mplstates[sta->mesh->plink_state]);
694 spin_unlock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 695 return;
696 }
697
bdcbd8e0 698 mpl_dbg(sta->sdata,
3088f7d2 699 "Mesh plink timer for %pM fired on state %s\n",
433f5bc1 700 sta->sta.addr, mplstates[sta->mesh->plink_state]);
d0709a65 701 sdata = sta->sdata;
453e66f2 702 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c 703
433f5bc1 704 switch (sta->mesh->plink_state) {
57cf8043
JC		 705 case NL80211_PLINK_OPN_RCVD:
706 case NL80211_PLINK_OPN_SNT:
c3896d2c 707 /* retry timer */
433f5bc1 708 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 709 u32 rand;
bdcbd8e0
JB		 710 mpl_dbg(sta->sdata,
711 "Mesh plink for %pM (retry, timeout): %d %d\n",
433f5bc1
JB		 712 sta->sta.addr, sta->mesh->plink_retries,
713 sta->mesh->plink_timeout);
c3896d2c 714 get_random_bytes(&rand, sizeof(u32));
433f5bc1
JB		 715 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
716 rand % sta->mesh->plink_timeout;
717 ++sta->mesh->plink_retries;
718 mod_plink_timer(sta, sta->mesh->plink_timeout);
4efec451 719 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 720 break;
721 }
6f101ef0 722 reason = WLAN_REASON_MESH_MAX_RETRIES;
fc0561dc 723 fallthrough;
57cf8043 724 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 725 /* confirm timer */
726 if (!reason)
6f101ef0 727 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
433f5bc1 728 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
453e66f2 729 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 730 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 731 break;
57cf8043 732 case NL80211_PLINK_HOLDING:
c3896d2c 733 /* holding timer */
8fa7292f 734 timer_delete(&sta->mesh->plink_timer);
c3896d2c 735 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 736 break;
737 default:
c3896d2c
LCC		 738 break;
739 }
433f5bc1 740 spin_unlock_bh(&sta->mesh->plink_lock);
4efec451 741 if (action)
a69bd8e6 742 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1 743 sta->mesh->llid, sta->mesh->plid, reason);
c3896d2c
LCC		 744}
745
0df2f6c1 746static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 747{
433f5bc1 748 sta->mesh->plink_timeout = timeout;
4c02d62f 749 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
c3896d2c
LCC		 750}
751
204d1304 752static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 753 u16 llid)
204d1304
TP		 754{
755 struct ieee80211_local *local = sdata->local;
756 bool in_use = false;
757 struct sta_info *sta;
758
759 rcu_read_lock();
760 list_for_each_entry_rcu(sta, &local->sta_list, list) {
520c75dc
MS		 761 if (sdata != sta->sdata)
762 continue;
763
433f5bc1 764 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
204d1304
TP		 765 in_use = true;
766 break;
767 }
768 }
769 rcu_read_unlock();
770
771 return in_use;
772}
773
6f101ef0 774static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 775{
776 u16 llid;
777
778 do {
779 get_random_bytes(&llid, sizeof(llid));
6f101ef0 780 } while (llid_in_use(sdata, llid));
204d1304 781
6f101ef0 782 return llid;
204d1304
TP		 783}
784
15ddba5f 785u64 mesh_plink_open(struct sta_info *sta)
c3896d2c 786{
d0709a65 787 struct ieee80211_sub_if_data *sdata = sta->sdata;
15ddba5f 788 u64 changed;
c3896d2c 789
c2c98fde 790 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 791 return 0;
53e80511 792
433f5bc1
JB		 793 spin_lock_bh(&sta->mesh->plink_lock);
794 sta->mesh->llid = mesh_get_new_llid(sdata);
795 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
796 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
797 spin_unlock_bh(&sta->mesh->plink_lock);
39886b61 798 return 0;
c3896d2c 799 }
433f5bc1 800 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 801 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
433f5bc1 802 spin_unlock_bh(&sta->mesh->plink_lock);
bdcbd8e0
JB		 803 mpl_dbg(sdata,
804 "Mesh plink: starting establishment with %pM\n",
0c68ae26 805 sta->sta.addr);
c3896d2c 806
3f52b7e3 807 /* set the non-peer mode to active during peering */
39886b61 808 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 809
a69bd8e6 810 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
433f5bc1 811 sta->sta.addr, sta->mesh->llid, 0, 0);
39886b61 812 return changed;
c3896d2c
LCC		 813}
814
15ddba5f 815u64 mesh_plink_block(struct sta_info *sta)
c3896d2c 816{
15ddba5f 817 u64 changed;
c9370197 818
433f5bc1 819 spin_lock_bh(&sta->mesh->plink_lock);
df323818 820 changed = __mesh_plink_deactivate(sta);
433f5bc1
JB		 821 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
822 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82 823 mesh_path_flush_by_nexthop(sta);
c9370197 824
39886b61 825 return changed;
c3896d2c
LCC		 826}
827
e76d67f0
BC		 828static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
829 struct sta_info *sta,
830 enum plink_event event)
831{
832 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
6f101ef0
CYY		 833 u16 reason = (event == CLS_ACPT) ?
834 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0 835
433f5bc1
JB		 836 sta->mesh->reason = reason;
837 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
272a9e26 838 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 839}
840
15ddba5f 841static u64 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
e76d67f0
BC		 842 struct sta_info *sta)
843{
844 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
15ddba5f 845 u64 changed = 0;
e76d67f0 846
8fa7292f 847 timer_delete(&sta->mesh->plink_timer);
433f5bc1 848 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
e76d67f0
BC		 849 changed |= mesh_plink_inc_estab_count(sdata);
850 changed |= mesh_set_ht_prot_mode(sdata);
851 changed |= mesh_set_short_slot_time(sdata);
852 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
853 ieee80211_mps_sta_status_update(sta);
854 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
855 return changed;
856}
857
c7e67811
TP		 858/**
859 * mesh_plink_fsm - step @sta MPM based on @event
860 *
861 * @sdata: interface
862 * @sta: mesh neighbor
863 * @event: peering event
864 *
865 * Return: changed MBSS flags
866 */
15ddba5f 867static u64 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
c7e67811
TP		 868 struct sta_info *sta, enum plink_event event)
869{
870 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
871 enum ieee80211_self_protected_actioncode action = 0;
15ddba5f 872 u64 changed = 0;
e596af82 873 bool flush = false;
c7e67811
TP		 874
875 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
433f5bc1 876 mplstates[sta->mesh->plink_state], mplevents[event]);
c7e67811 877
433f5bc1
JB		 878 spin_lock_bh(&sta->mesh->plink_lock);
879 switch (sta->mesh->plink_state) {
c7e67811
TP		 880 case NL80211_PLINK_LISTEN:
881 switch (event) {
882 case CLS_ACPT:
883 mesh_plink_fsm_restart(sta);
884 break;
885 case OPN_ACPT:
433f5bc1
JB		 886 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
887 sta->mesh->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 888 mesh_plink_timer_set(sta,
889 mshcfg->dot11MeshRetryTimeout);
890
891 /* set the non-peer mode to active during peering */
892 changed |= ieee80211_mps_local_status_update(sdata);
893 action = WLAN_SP_MESH_PEERING_OPEN;
894 break;
895 default:
896 break;
897 }
898 break;
899 case NL80211_PLINK_OPN_SNT:
900 switch (event) {
901 case OPN_RJCT:
902 case CNF_RJCT:
903 case CLS_ACPT:
904 mesh_plink_close(sdata, sta, event);
905 action = WLAN_SP_MESH_PEERING_CLOSE;
906 break;
907 case OPN_ACPT:
908 /* retry timer is left untouched */
433f5bc1 909 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
c7e67811
TP		 910 action = WLAN_SP_MESH_PEERING_CONFIRM;
911 break;
912 case CNF_ACPT:
433f5bc1 913 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 914 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 915 break;
916 default:
917 break;
918 }
919 break;
920 case NL80211_PLINK_OPN_RCVD:
921 switch (event) {
922 case OPN_RJCT:
923 case CNF_RJCT:
924 case CLS_ACPT:
925 mesh_plink_close(sdata, sta, event);
926 action = WLAN_SP_MESH_PEERING_CLOSE;
927 break;
928 case OPN_ACPT:
929 action = WLAN_SP_MESH_PEERING_CONFIRM;
930 break;
931 case CNF_ACPT:
932 changed |= mesh_plink_establish(sdata, sta);
933 break;
934 default:
935 break;
936 }
937 break;
938 case NL80211_PLINK_CNF_RCVD:
939 switch (event) {
940 case OPN_RJCT:
941 case CNF_RJCT:
942 case CLS_ACPT:
943 mesh_plink_close(sdata, sta, event);
944 action = WLAN_SP_MESH_PEERING_CLOSE;
945 break;
946 case OPN_ACPT:
947 changed |= mesh_plink_establish(sdata, sta);
948 action = WLAN_SP_MESH_PEERING_CONFIRM;
949 break;
950 default:
951 break;
952 }
953 break;
954 case NL80211_PLINK_ESTAB:
955 switch (event) {
956 case CLS_ACPT:
957 changed |= __mesh_plink_deactivate(sta);
958 changed |= mesh_set_ht_prot_mode(sdata);
959 changed |= mesh_set_short_slot_time(sdata);
960 mesh_plink_close(sdata, sta, event);
961 action = WLAN_SP_MESH_PEERING_CLOSE;
e596af82 962 flush = true;
c7e67811
TP		 963 break;
964 case OPN_ACPT:
965 action = WLAN_SP_MESH_PEERING_CONFIRM;
966 break;
967 default:
968 break;
969 }
970 break;
971 case NL80211_PLINK_HOLDING:
972 switch (event) {
973 case CLS_ACPT:
8fa7292f 974 timer_delete(&sta->mesh->plink_timer);
c7e67811
TP		 975 mesh_plink_fsm_restart(sta);
976 break;
977 case OPN_ACPT:
978 case CNF_ACPT:
979 case OPN_RJCT:
980 case CNF_RJCT:
981 action = WLAN_SP_MESH_PEERING_CLOSE;
982 break;
983 default:
984 break;
985 }
986 break;
987 default:
988 /* should not get here, PLINK_BLOCKED is dealt with at the
989 * beginning of the function
990 */
991 break;
992 }
433f5bc1 993 spin_unlock_bh(&sta->mesh->plink_lock);
e596af82
BC		 994 if (flush)
995 mesh_path_flush_by_nexthop(sta);
c7e67811 996 if (action) {
a69bd8e6 997 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1
JB		 998 sta->mesh->llid, sta->mesh->plid,
999 sta->mesh->reason);
c7e67811
TP		 1000
1001 /* also send confirm in open case */
1002 if (action == WLAN_SP_MESH_PEERING_OPEN) {
a69bd8e6 1003 mesh_plink_frame_tx(sdata, sta,
c7e67811 1004 WLAN_SP_MESH_PEERING_CONFIRM,
433f5bc1
JB		 1005 sta->sta.addr, sta->mesh->llid,
1006 sta->mesh->plid, 0);
c7e67811
TP		 1007 }
1008 }
1009
1010 return changed;
1011}
1012
c99a89ed
TP		 1013/*
1014 * mesh_plink_get_event - get correct MPM event
1015 *
1016 * @sdata: interface
1017 * @sta: peer, leave NULL if processing a frame from a new suitable peer
1018 * @elems: peering management IEs
1019 * @ftype: frame type
1020 * @llid: peer's peer link ID
1021 * @plid: peer's local link ID
1022 *
1023 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1024 * an error.
1025 */
1026static enum plink_event
1027mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1028 struct sta_info *sta,
1029 struct ieee802_11_elems *elems,
1030 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 1031 u16 llid, u16 plid)
c99a89ed
TP		 1032{
1033 enum plink_event event = PLINK_UNDEFINED;
1034 u8 ie_len = elems->peering_len;
1035 bool matches_local;
1036
1037 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1038 mesh_matches_local(sdata, elems));
1039
1040 /* deny open request from non-matching peer */
1041 if (!matches_local && !sta) {
1042 event = OPN_RJCT;
1043 goto out;
1044 }
1045
1046 if (!sta) {
1047 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1048 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1049 goto out;
1050 }
1051 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1052 if (!mesh_plink_free_count(sdata)) {
1053 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1054 goto out;
1055 }
b8631c00
SS		 1056
1057 /* new matching peer */
1058 event = OPN_ACPT;
1059 goto out;
c99a89ed
TP		 1060 } else {
1061 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1062 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1063 goto out;
1064 }
433f5bc1 1065 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
c99a89ed
TP		 1066 goto out;
1067 }
1068
c99a89ed
TP		 1069 switch (ftype) {
1070 case WLAN_SP_MESH_PEERING_OPEN:
1071 if (!matches_local)
1072 event = OPN_RJCT;
8c386b16
JB		 1073 else if (!mesh_plink_free_count(sdata) ||
1074 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1075 event = OPN_IGNR;
1076 else
1077 event = OPN_ACPT;
1078 break;
1079 case WLAN_SP_MESH_PEERING_CONFIRM:
1080 if (!matches_local)
1081 event = CNF_RJCT;
8c386b16
JB		 1082 else if (!mesh_plink_free_count(sdata) ||
1083 sta->mesh->llid != llid ||
1084 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1085 event = CNF_IGNR;
1086 else
1087 event = CNF_ACPT;
1088 break;
1089 case WLAN_SP_MESH_PEERING_CLOSE:
433f5bc1 1090 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
c99a89ed
TP		 1091 /* Do not check for llid or plid. This does not
1092 * follow the standard but since multiple plinks
1093 * per sta are not supported, it is necessary in
1094 * order to avoid a livelock when MP A sees an
1095 * establish peer link to MP B but MP B does not
1096 * see it. This can be caused by a timeout in
1097 * B's peer link establishment or B beign
1098 * restarted.
1099 */
1100 event = CLS_ACPT;
433f5bc1 1101 else if (sta->mesh->plid != plid)
c99a89ed 1102 event = CLS_IGNR;
433f5bc1 1103 else if (ie_len == 8 && sta->mesh->llid != llid)
c99a89ed
TP		 1104 event = CLS_IGNR;
1105 else
1106 event = CLS_ACPT;
1107 break;
1108 default:
1109 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1110 break;
1111 }
1112
1113out:
1114 return event;
1115}
1116
05a23ae9
TP		 1117static void
1118mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1119 struct ieee80211_mgmt *mgmt,
ecbc12ad
BC		 1120 struct ieee802_11_elems *elems,
1121 struct ieee80211_rx_status *rx_status)
c3896d2c 1122{
05a23ae9 1123
c3896d2c
LCC		 1124 struct sta_info *sta;
1125 enum plink_event event;
54ef656b 1126 enum ieee80211_self_protected_actioncode ftype;
15ddba5f 1127 u64 changed = 0;
c99a89ed 1128 u8 ie_len = elems->peering_len;
6f101ef0 1129 u16 plid, llid = 0;
c3896d2c 1130
05a23ae9 1131 if (!elems->peering) {
bdcbd8e0
JB		 1132 mpl_dbg(sdata,
1133 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1134 return;
1135 }
bf7cd94d 1136
05a23ae9 1137 if (elems->rsn_len &&
bf7cd94d 1138 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1139 mpl_dbg(sdata,
1140 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1141 return;
1142 }
c3896d2c 1143
8db09850 1144 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1145 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1146 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1147 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1148 && ie_len != 8)) {
bdcbd8e0
JB		 1149 mpl_dbg(sdata,
1150 "Mesh plink: incorrect plink ie length %d %d\n",
1151 ftype, ie_len);
c3896d2c
LCC		 1152 return;
1153 }
1154
54ef656b 1155 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1156 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1157 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1158 return;
1159 }
1160 /* Note the lines below are correct, the llid in the frame is the plid
1161 * from the point of view of this host.
1162 */
f8134fed 1163 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1164 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1165 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1166 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1167
296fcba3 1168 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1169 rcu_read_lock();
1170
abe60632 1171 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1172
55335137 1173 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1174 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1175 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1176 mgmt->sa);
fc10302e 1177 goto unlock_rcu;
55335137
AN		 1178 }
1179
c3896d2c 1180 /* Now we will figure out the appropriate event... */
c99a89ed 1181 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1182
1183 if (event == OPN_ACPT) {
296fcba3 1184 rcu_read_unlock();
54ab1ffb 1185 /* allocate sta entry if necessary and update info */
ecbc12ad 1186 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
54ab1ffb 1187 if (!sta) {
bdcbd8e0 1188 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1189 goto unlock_rcu;
54ab1ffb 1190 }
433f5bc1 1191 sta->mesh->plid = plid;
c99a89ed 1192 } else if (!sta && event == OPN_RJCT) {
a69bd8e6 1193 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
c99a89ed 1194 mgmt->sa, 0, plid,
6f101ef0 1195 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1196 goto unlock_rcu;
1197 } else if (!sta || event == PLINK_UNDEFINED) {
1198 /* something went wrong */
1199 goto unlock_rcu;
c3896d2c
LCC		 1200 }
1201
a69bd8e6
BC		 1202 if (event == CNF_ACPT) {
1203 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
0e0060fc 1204 if (!sta->mesh->plid)
a69bd8e6 1205 sta->mesh->plid = plid;
a69bd8e6
BC		 1206
1207 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1208 }
6c6fa496 1209
c7e67811 1210 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1211
fc10302e 1212unlock_rcu:
d0709a65 1213 rcu_read_unlock();
57aac7c5 1214
ecccd072 1215 if (changed)
2b5e1967 1216 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1217}
05a23ae9
TP		 1218
1219void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1220 struct ieee80211_mgmt *mgmt, size_t len,
1221 struct ieee80211_rx_status *rx_status)
1222{
5d24828d 1223 struct ieee802_11_elems *elems;
05a23ae9
TP		 1224 size_t baselen;
1225 u8 *baseaddr;
1226
1227 /* need action_code, aux */
1228 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1229 return;
1230
1231 if (sdata->u.mesh.user_mpm)
1232 /* userspace must register for these */
1233 return;
1234
1235 if (is_multicast_ether_addr(mgmt->da)) {
1236 mpl_dbg(sdata,
1237 "Mesh plink: ignore frame from multicast address\n");
1238 return;
1239 }
1240
1241 baseaddr = mgmt->u.action.u.self_prot.variable;
1242 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1243 if (mgmt->u.action.u.self_prot.action_code ==
1244 WLAN_SP_MESH_PEERING_CONFIRM) {
1245 baseaddr += 4;
1246 baselen += 4;
b3e7de87
BC		 1247
1248 if (baselen > len)
1249 return;
05a23ae9 1250 }
38c6aa29 1251 elems = ieee802_11_parse_elems(baseaddr, len - baselen, true, NULL);
1fc4a3ee
JB		 1252 if (elems) {
1253 mesh_process_plink_frame(sdata, mgmt, elems, rx_status);
1254 kfree(elems);
1255 }
05a23ae9 1256}
Linux 6.x block layer and io_uring tree(s)