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Merge branch 'inet-frag-fixes'
[linux-2.6-block.git] / net / mac80211 / mesh_plink.c
CommitLineData
c3896d2c 1/*
264d9b7d 2 * Copyright (c) 2008, 2009 open80211s Ltd.
c3896d2c
LCC		 3 * Author: Luis Carlos Cobo <luisca@cozybit.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
5a0e3ad6 9#include <linux/gfp.h>
902acc78
JB		 10#include <linux/kernel.h>
11#include <linux/random.h>
c3896d2c 12#include "ieee80211_i.h"
2c8dccc7 13#include "rate.h"
c3896d2c 14#include "mesh.h"
c3896d2c 15
8db09850
TP		 16#define PLINK_GET_LLID(p) (p + 2)
17#define PLINK_GET_PLID(p) (p + 4)
c3896d2c
LCC		 18
19#define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
cc57ac53 20 jiffies + msecs_to_jiffies(t)))
c3896d2c 21
c3896d2c
LCC		 22enum plink_event {
23 PLINK_UNDEFINED,
24 OPN_ACPT,
25 OPN_RJCT,
26 OPN_IGNR,
27 CNF_ACPT,
28 CNF_RJCT,
29 CNF_IGNR,
30 CLS_ACPT,
31 CLS_IGNR
32};
33
95e48add
TP		 34static const char * const mplstates[] = {
35 [NL80211_PLINK_LISTEN] = "LISTEN",
36 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
37 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
38 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
39 [NL80211_PLINK_ESTAB] = "ESTAB",
40 [NL80211_PLINK_HOLDING] = "HOLDING",
41 [NL80211_PLINK_BLOCKED] = "BLOCKED"
42};
43
44static const char * const mplevents[] = {
45 [PLINK_UNDEFINED] = "NONE",
46 [OPN_ACPT] = "OPN_ACPT",
47 [OPN_RJCT] = "OPN_RJCT",
48 [OPN_IGNR] = "OPN_IGNR",
49 [CNF_ACPT] = "CNF_ACPT",
50 [CNF_RJCT] = "CNF_RJCT",
51 [CNF_IGNR] = "CNF_IGNR",
52 [CLS_ACPT] = "CLS_ACPT",
53 [CLS_IGNR] = "CLS_IGNR"
54};
55
ba4a14e1 56static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
bf7cd94d 57 enum ieee80211_self_protected_actioncode action,
6f101ef0 58 u8 *da, u16 llid, u16 plid, u16 reason);
ba4a14e1 59
36c9bb29
BC		 60
61/* We only need a valid sta if user configured a minimum rssi_threshold. */
62static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
63 struct sta_info *sta)
64{
65 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
66 return rssi_threshold == 0 ||
67 (sta && (s8) -ewma_read(&sta->avg_signal) > rssi_threshold);
68}
69
c3896d2c
LCC		 70/**
71 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
72 *
23c7a29c 73 * @sta: mesh peer link to restart
c3896d2c 74 *
48bf6bed 75 * Locking: this function must be called holding sta->plink_lock
c3896d2c
LCC		 76 */
77static inline void mesh_plink_fsm_restart(struct sta_info *sta)
78{
48bf6bed 79 lockdep_assert_held(&sta->plink_lock);
57cf8043 80 sta->plink_state = NL80211_PLINK_LISTEN;
37659ff8
LCC		 81 sta->llid = sta->plid = sta->reason = 0;
82 sta->plink_retries = 0;
c3896d2c
LCC		 83}
84
3b144658
TP		 85/*
86 * mesh_set_short_slot_time - enable / disable ERP short slot time.
87 *
88 * The standard indirectly mandates mesh STAs to turn off short slot time by
89 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
90 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
91 * MBSS support ERP rates.
92 *
93 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
94 */
95static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
96{
97 struct ieee80211_local *local = sdata->local;
98 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
99 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
100 struct sta_info *sta;
101 u32 erp_rates = 0, changed = 0;
102 int i;
103 bool short_slot = false;
104
105 if (band == IEEE80211_BAND_5GHZ) {
106 /* (IEEE 802.11-2012 19.4.5) */
107 short_slot = true;
108 goto out;
ea1b2b45 109 } else if (band != IEEE80211_BAND_2GHZ)
3b144658
TP		 110 goto out;
111
112 for (i = 0; i < sband->n_bitrates; i++)
113 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
114 erp_rates |= BIT(i);
115
116 if (!erp_rates)
117 goto out;
118
119 rcu_read_lock();
120 list_for_each_entry_rcu(sta, &local->sta_list, list) {
121 if (sdata != sta->sdata ||
122 sta->plink_state != NL80211_PLINK_ESTAB)
123 continue;
124
125 short_slot = false;
126 if (erp_rates & sta->sta.supp_rates[band])
127 short_slot = true;
128 else
129 break;
130 }
131 rcu_read_unlock();
132
133out:
134 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
135 sdata->vif.bss_conf.use_short_slot = short_slot;
136 changed = BSS_CHANGED_ERP_SLOT;
137 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
138 sdata->vif.addr, short_slot);
139 }
140 return changed;
141}
142
2c53040f 143/**
cbf9322e 144 * mesh_set_ht_prot_mode - set correct HT protection mode
57aac7c5 145 *
cbf9322e
AN		 146 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
147 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
148 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
149 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
150 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
151 * HT20 peer is present. Otherwise no-protection mode is selected.
57aac7c5
AN		 152 */
153static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
154{
155 struct ieee80211_local *local = sdata->local;
156 struct sta_info *sta;
57aac7c5
AN		 157 u16 ht_opmode;
158 bool non_ht_sta = false, ht20_sta = false;
159
0418a445
SW		 160 switch (sdata->vif.bss_conf.chandef.width) {
161 case NL80211_CHAN_WIDTH_20_NOHT:
162 case NL80211_CHAN_WIDTH_5:
163 case NL80211_CHAN_WIDTH_10:
57aac7c5 164 return 0;
0418a445
SW		 165 default:
166 break;
167 }
57aac7c5
AN		 168
169 rcu_read_lock();
170 list_for_each_entry_rcu(sta, &local->sta_list, list) {
cbf9322e
AN		 171 if (sdata != sta->sdata ||
172 sta->plink_state != NL80211_PLINK_ESTAB)
173 continue;
174
52ac8c48
TP		 175 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
176 continue;
177
178 if (!sta->sta.ht_cap.ht_supported) {
179 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
180 sta->sta.addr);
cbf9322e 181 non_ht_sta = true;
cbf9322e 182 break;
57aac7c5 183 }
52ac8c48
TP		 184
185 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
186 ht20_sta = true;
57aac7c5 187 }
57aac7c5
AN		 188 rcu_read_unlock();
189
190 if (non_ht_sta)
191 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
466f310d 192 else if (ht20_sta &&
4bf88530 193 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
57aac7c5
AN		 194 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
195 else
196 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
197
52ac8c48
TP		 198 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
199 return 0;
57aac7c5 200
52ac8c48
TP		 201 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
202 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
203 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
204 return BSS_CHANGED_HT;
57aac7c5
AN		 205}
206
c3896d2c 207/**
c9370197 208 * __mesh_plink_deactivate - deactivate mesh peer link
c3896d2c
LCC		 209 *
210 * @sta: mesh peer link to deactivate
211 *
212 * All mesh paths with this peer as next hop will be flushed
df323818 213 * Returns beacon changed flag if the beacon content changed.
c3896d2c 214 *
48bf6bed 215 * Locking: the caller must hold sta->plink_lock
c3896d2c 216 */
df323818 217static u32 __mesh_plink_deactivate(struct sta_info *sta)
c3896d2c 218{
d0709a65 219 struct ieee80211_sub_if_data *sdata = sta->sdata;
df323818 220 u32 changed = 0;
d0709a65 221
48bf6bed
BC		 222 lockdep_assert_held(&sta->plink_lock);
223
df323818
MP		 224 if (sta->plink_state == NL80211_PLINK_ESTAB)
225 changed = mesh_plink_dec_estab_count(sdata);
57cf8043 226 sta->plink_state = NL80211_PLINK_BLOCKED;
c3896d2c 227 mesh_path_flush_by_nexthop(sta);
c9370197 228
3f52b7e3 229 ieee80211_mps_sta_status_update(sta);
446075d7
MP		 230 changed |= ieee80211_mps_set_sta_local_pm(sta,
231 NL80211_MESH_POWER_UNKNOWN);
3f52b7e3 232
df323818 233 return changed;
c3896d2c
LCC		 234}
235
902acc78 236/**
c9370197 237 * mesh_plink_deactivate - deactivate mesh peer link
902acc78
JB		 238 *
239 * @sta: mesh peer link to deactivate
240 *
241 * All mesh paths with this peer as next hop will be flushed
242 */
45b5028e 243u32 mesh_plink_deactivate(struct sta_info *sta)
902acc78 244{
c9370197 245 struct ieee80211_sub_if_data *sdata = sta->sdata;
df323818 246 u32 changed;
c9370197 247
48bf6bed 248 spin_lock_bh(&sta->plink_lock);
df323818 249 changed = __mesh_plink_deactivate(sta);
6f101ef0 250 sta->reason = WLAN_REASON_MESH_PEER_CANCELED;
ba4a14e1
TP		 251 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
252 sta->sta.addr, sta->llid, sta->plid,
253 sta->reason);
48bf6bed 254 spin_unlock_bh(&sta->plink_lock);
c9370197 255
45b5028e 256 return changed;
902acc78
JB		 257}
258
f698d856 259static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
bf7cd94d 260 enum ieee80211_self_protected_actioncode action,
6f101ef0 261 u8 *da, u16 llid, u16 plid, u16 reason)
bf7cd94d 262{
f698d856 263 struct ieee80211_local *local = sdata->local;
3b69a9c5 264 struct sk_buff *skb;
e7570dfb 265 struct ieee80211_tx_info *info;
c3896d2c
LCC		 266 struct ieee80211_mgmt *mgmt;
267 bool include_plid = false;
8db09850 268 u16 peering_proto = 0;
3b69a9c5
TP		 269 u8 *pos, ie_len = 4;
270 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
271 sizeof(mgmt->u.action.u.self_prot);
f609a43d 272 int err = -ENOMEM;
3b69a9c5 273
65e8b0cc 274 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 275 hdr_len +
276 2 + /* capability info */
277 2 + /* AID */
278 2 + 8 + /* supported rates */
279 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
280 2 + sdata->u.mesh.mesh_id_len +
281 2 + sizeof(struct ieee80211_meshconf_ie) +
176f3608 282 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 283 2 + sizeof(struct ieee80211_ht_operation) +
3b69a9c5
TP		 284 2 + 8 + /* peering IE */
285 sdata->u.mesh.ie_len);
c3896d2c 286 if (!skb)
87d84c45 287 return err;
e7570dfb 288 info = IEEE80211_SKB_CB(skb);
65e8b0cc 289 skb_reserve(skb, local->tx_headroom);
3b69a9c5
TP		 290 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
291 memset(mgmt, 0, hdr_len);
e7827a70
HH		 292 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
293 IEEE80211_STYPE_ACTION);
c3896d2c 294 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 295 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 296 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 297 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
298 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 299
8db09850 300 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
55de908a
JB		 301 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
302
8db09850
TP		 303 /* capability info */
304 pos = skb_put(skb, 2);
305 memset(pos, 0, 2);
54ef656b 306 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 307 /* AID */
308 pos = skb_put(skb, 2);
2ea752cd 309 put_unaligned_le16(plid, pos);
c3896d2c 310 }
55de908a
JB		 311 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
312 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 313 mesh_add_rsn_ie(sdata, skb) ||
314 mesh_add_meshid_ie(sdata, skb) ||
315 mesh_add_meshconf_ie(sdata, skb))
f609a43d 316 goto free;
8db09850 317 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 318 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 319 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 320 goto free;
c3896d2c
LCC		 321 }
322
8db09850 323 /* Add Mesh Peering Management element */
c3896d2c 324 switch (action) {
54ef656b 325 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 326 break;
54ef656b 327 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 328 ie_len += 2;
c3896d2c
LCC		 329 include_plid = true;
330 break;
54ef656b 331 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 332 if (plid) {
333 ie_len += 2;
c3896d2c
LCC		 334 include_plid = true;
335 }
8db09850 336 ie_len += 2; /* reason code */
c3896d2c 337 break;
8db09850 338 default:
f609a43d
TP		 339 err = -EINVAL;
340 goto free;
c3896d2c
LCC		 341 }
342
8db09850 343 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 344 goto free;
8db09850 345
c3896d2c 346 pos = skb_put(skb, 2 + ie_len);
8db09850 347 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 348 *pos++ = ie_len;
8db09850
TP		 349 memcpy(pos, &peering_proto, 2);
350 pos += 2;
6f101ef0 351 put_unaligned_le16(llid, pos);
8db09850 352 pos += 2;
c3896d2c 353 if (include_plid) {
6f101ef0 354 put_unaligned_le16(plid, pos);
8db09850 355 pos += 2;
c3896d2c 356 }
54ef656b 357 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 358 put_unaligned_le16(reason, pos);
8db09850 359 pos += 2;
c3896d2c 360 }
176f3608
TP		 361
362 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d
JB		 363 if (mesh_add_ht_cap_ie(sdata, skb) ||
364 mesh_add_ht_oper_ie(sdata, skb))
f609a43d 365 goto free;
176f3608
TP		 366 }
367
bf7cd94d 368 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 369 goto free;
c3896d2c 370
62ae67be 371 ieee80211_tx_skb(sdata, skb);
c3896d2c 372 return 0;
f609a43d
TP		 373free:
374 kfree_skb(skb);
375 return err;
c3896d2c
LCC		 376}
377
296fcba3
TP		 378static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
379 struct sta_info *sta,
380 struct ieee802_11_elems *elems, bool insert)
c3896d2c 381{
f698d856 382 struct ieee80211_local *local = sdata->local;
55de908a 383 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
54ab1ffb 384 struct ieee80211_supported_band *sband;
f68d776a 385 u32 rates, basic_rates = 0, changed = 0;
abcff6ef 386 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
c3896d2c 387
f743ff49 388 sband = local->hw.wiphy->bands[band];
2103dec1 389 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
d0709a65 390
48bf6bed 391 spin_lock_bh(&sta->plink_lock);
c3896d2c 392 sta->last_rx = jiffies;
296fcba3
TP		 393
394 /* rates and capabilities don't change during peering */
e060e7ad 395 if (sta->plink_state == NL80211_PLINK_ESTAB && sta->processed_beacon)
296fcba3 396 goto out;
e060e7ad 397 sta->processed_beacon = true;
bae35d92 398
f68d776a
TP		 399 if (sta->sta.supp_rates[band] != rates)
400 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
f743ff49 401 sta->sta.supp_rates[band] = rates;
54ab1ffb 402
52ac8c48
TP		 403 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
404 elems->ht_cap_elem, sta))
405 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 406
abcff6ef
JD		 407 if (bw != sta->sta.bandwidth)
408 changed |= IEEE80211_RC_BW_CHANGED;
409
52ac8c48
TP		 410 /* HT peer is operating 20MHz-only */
411 if (elems->ht_operation &&
412 !(elems->ht_operation->ht_param &
413 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
414 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 415 changed |= IEEE80211_RC_BW_CHANGED;
52ac8c48 416 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 417 }
c7d25828 418
59cf1d65
HS		 419 if (insert)
420 rate_control_rate_init(sta);
f68d776a
TP		 421 else
422 rate_control_rate_update(local, sband, sta, changed);
296fcba3 423out:
48bf6bed 424 spin_unlock_bh(&sta->plink_lock);
296fcba3
TP		 425}
426
427static struct sta_info *
428__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
429{
430 struct sta_info *sta;
54ab1ffb 431
296fcba3 432 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 433 return NULL;
434
296fcba3
TP		 435 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
436 if (!sta)
437 return NULL;
438
439 sta->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 440 sta->sta.wme = true;
296fcba3
TP		 441
442 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
443 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
444 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
445
296fcba3
TP		 446 return sta;
447}
448
449static struct sta_info *
450mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
451 struct ieee802_11_elems *elems)
452{
453 struct sta_info *sta = NULL;
454
a6dad6a2
TP		 455 /* Userspace handles station allocation */
456 if (sdata->u.mesh.user_mpm ||
457 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
296fcba3
TP		 458 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
459 elems->ie_start,
460 elems->total_len,
461 GFP_KERNEL);
462 else
463 sta = __mesh_sta_info_alloc(sdata, addr);
464
54ab1ffb
TP		 465 return sta;
466}
467
296fcba3
TP		 468/*
469 * mesh_sta_info_get - return mesh sta info entry for @addr.
470 *
471 * @sdata: local meshif
472 * @addr: peer's address
473 * @elems: IEs from beacon or mesh peering frame.
474 *
475 * Return existing or newly allocated sta_info under RCU read lock.
476 * (re)initialize with given IEs.
477 */
478static struct sta_info *
479mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
480 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
481{
482 struct sta_info *sta = NULL;
483
484 rcu_read_lock();
485 sta = sta_info_get(sdata, addr);
486 if (sta) {
487 mesh_sta_info_init(sdata, sta, elems, false);
488 } else {
489 rcu_read_unlock();
490 /* can't run atomic */
491 sta = mesh_sta_info_alloc(sdata, addr, elems);
492 if (!sta) {
493 rcu_read_lock();
494 return NULL;
495 }
496
3b4797bc
TP		 497 mesh_sta_info_init(sdata, sta, elems, true);
498
296fcba3
TP		 499 if (sta_info_insert_rcu(sta))
500 return NULL;
501 }
502
503 return sta;
504}
505
506/*
507 * mesh_neighbour_update - update or initialize new mesh neighbor.
508 *
509 * @sdata: local meshif
510 * @addr: peer's address
511 * @elems: IEs from beacon or mesh peering frame
512 *
513 * Initiates peering if appropriate.
514 */
f743ff49
TP		 515void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
516 u8 *hw_addr,
54ab1ffb
TP		 517 struct ieee802_11_elems *elems)
518{
519 struct sta_info *sta;
39886b61 520 u32 changed = 0;
54ab1ffb 521
296fcba3 522 sta = mesh_sta_info_get(sdata, hw_addr, elems);
54ab1ffb
TP		 523 if (!sta)
524 goto out;
525
1570ca59 526 if (mesh_peer_accepts_plinks(elems) &&
54ab1ffb
TP		 527 sta->plink_state == NL80211_PLINK_LISTEN &&
528 sdata->u.mesh.accepting_plinks &&
529 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 530 rssi_threshold_check(sdata, sta))
39886b61 531 changed = mesh_plink_open(sta);
c3896d2c 532
3f52b7e3 533 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 534out:
d0709a65 535 rcu_read_unlock();
2b5e1967 536 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 537}
538
539static void mesh_plink_timer(unsigned long data)
540{
541 struct sta_info *sta;
6f101ef0 542 u16 reason = 0;
c3896d2c 543 struct ieee80211_sub_if_data *sdata;
453e66f2 544 struct mesh_config *mshcfg;
4efec451 545 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 546
d0709a65
JB		 547 /*
548 * This STA is valid because sta_info_destroy() will
549 * del_timer_sync() this timer after having made sure
550 * it cannot be readded (by deleting the plink.)
551 */
c3896d2c
LCC		 552 sta = (struct sta_info *) data;
553
690205f1 554 if (sta->sdata->local->quiescing)
5bb644a0 555 return;
5bb644a0 556
48bf6bed 557 spin_lock_bh(&sta->plink_lock);
2b470c39
BC		 558
559 /* If a timer fires just before a state transition on another CPU,
560 * we may have already extended the timeout and changed state by the
561 * time we've acquired the lock and arrived here. In that case,
562 * skip this timer and wait for the new one.
563 */
564 if (time_before(jiffies, sta->plink_timer.expires)) {
565 mpl_dbg(sta->sdata,
566 "Ignoring timer for %pM in state %s (timer adjusted)",
567 sta->sta.addr, mplstates[sta->plink_state]);
48bf6bed 568 spin_unlock_bh(&sta->plink_lock);
c3896d2c
LCC		 569 return;
570 }
2b470c39
BC		 571
572 /* del_timer() and handler may race when entering these states */
573 if (sta->plink_state == NL80211_PLINK_LISTEN ||
574 sta->plink_state == NL80211_PLINK_ESTAB) {
575 mpl_dbg(sta->sdata,
576 "Ignoring timer for %pM in state %s (timer deleted)",
577 sta->sta.addr, mplstates[sta->plink_state]);
48bf6bed 578 spin_unlock_bh(&sta->plink_lock);
2b470c39
BC		 579 return;
580 }
581
bdcbd8e0 582 mpl_dbg(sta->sdata,
3088f7d2
TP		 583 "Mesh plink timer for %pM fired on state %s\n",
584 sta->sta.addr, mplstates[sta->plink_state]);
d0709a65 585 sdata = sta->sdata;
453e66f2 586 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c
LCC		 587
588 switch (sta->plink_state) {
57cf8043
JC		 589 case NL80211_PLINK_OPN_RCVD:
590 case NL80211_PLINK_OPN_SNT:
c3896d2c 591 /* retry timer */
453e66f2 592 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 593 u32 rand;
bdcbd8e0
JB		 594 mpl_dbg(sta->sdata,
595 "Mesh plink for %pM (retry, timeout): %d %d\n",
0c68ae26
JB		 596 sta->sta.addr, sta->plink_retries,
597 sta->plink_timeout);
c3896d2c
LCC		 598 get_random_bytes(&rand, sizeof(u32));
599 sta->plink_timeout = sta->plink_timeout +
600 rand % sta->plink_timeout;
601 ++sta->plink_retries;
d0709a65 602 mod_plink_timer(sta, sta->plink_timeout);
4efec451 603 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 604 break;
605 }
6f101ef0 606 reason = WLAN_REASON_MESH_MAX_RETRIES;
c3896d2c 607 /* fall through on else */
57cf8043 608 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 609 /* confirm timer */
610 if (!reason)
6f101ef0 611 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
57cf8043 612 sta->plink_state = NL80211_PLINK_HOLDING;
453e66f2 613 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 614 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 615 break;
57cf8043 616 case NL80211_PLINK_HOLDING:
c3896d2c 617 /* holding timer */
d0709a65 618 del_timer(&sta->plink_timer);
c3896d2c 619 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 620 break;
621 default:
c3896d2c
LCC		 622 break;
623 }
48bf6bed 624 spin_unlock_bh(&sta->plink_lock);
4efec451
TP		 625 if (action)
626 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
6f101ef0 627 sta->llid, sta->plid, reason);
c3896d2c
LCC		 628}
629
0df2f6c1 630static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 631{
cc57ac53 632 sta->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
c3896d2c
LCC		 633 sta->plink_timer.data = (unsigned long) sta;
634 sta->plink_timer.function = mesh_plink_timer;
635 sta->plink_timeout = timeout;
c3896d2c
LCC		 636 add_timer(&sta->plink_timer);
637}
638
204d1304 639static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 640 u16 llid)
204d1304
TP		 641{
642 struct ieee80211_local *local = sdata->local;
643 bool in_use = false;
644 struct sta_info *sta;
645
646 rcu_read_lock();
647 list_for_each_entry_rcu(sta, &local->sta_list, list) {
648 if (!memcmp(&sta->llid, &llid, sizeof(llid))) {
649 in_use = true;
650 break;
651 }
652 }
653 rcu_read_unlock();
654
655 return in_use;
656}
657
6f101ef0 658static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 659{
660 u16 llid;
661
662 do {
663 get_random_bytes(&llid, sizeof(llid));
664 /* for mesh PS we still only have the AID range for TIM bits */
665 llid = (llid % IEEE80211_MAX_AID) + 1;
6f101ef0 666 } while (llid_in_use(sdata, llid));
204d1304 667
6f101ef0 668 return llid;
204d1304
TP		 669}
670
39886b61 671u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 672{
d0709a65 673 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 674 u32 changed;
c3896d2c 675
c2c98fde 676 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 677 return 0;
53e80511 678
48bf6bed 679 spin_lock_bh(&sta->plink_lock);
204d1304 680 sta->llid = mesh_get_new_llid(sdata);
9385d04f
CYY		 681 if (sta->plink_state != NL80211_PLINK_LISTEN &&
682 sta->plink_state != NL80211_PLINK_BLOCKED) {
48bf6bed 683 spin_unlock_bh(&sta->plink_lock);
39886b61 684 return 0;
c3896d2c 685 }
57cf8043 686 sta->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 687 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
48bf6bed 688 spin_unlock_bh(&sta->plink_lock);
bdcbd8e0
JB		 689 mpl_dbg(sdata,
690 "Mesh plink: starting establishment with %pM\n",
0c68ae26 691 sta->sta.addr);
c3896d2c 692
3f52b7e3 693 /* set the non-peer mode to active during peering */
39886b61 694 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 695
39886b61 696 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
204d1304 697 sta->sta.addr, sta->llid, 0, 0);
39886b61 698 return changed;
c3896d2c
LCC		 699}
700
39886b61 701u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 702{
df323818 703 u32 changed;
c9370197 704
48bf6bed 705 spin_lock_bh(&sta->plink_lock);
df323818 706 changed = __mesh_plink_deactivate(sta);
57cf8043 707 sta->plink_state = NL80211_PLINK_BLOCKED;
48bf6bed 708 spin_unlock_bh(&sta->plink_lock);
c9370197 709
39886b61 710 return changed;
c3896d2c
LCC		 711}
712
e76d67f0
BC		 713static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
714 struct sta_info *sta,
715 enum plink_event event)
716{
717 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
718
6f101ef0
CYY		 719 u16 reason = (event == CLS_ACPT) ?
720 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0
BC		 721
722 sta->reason = reason;
723 sta->plink_state = NL80211_PLINK_HOLDING;
272a9e26 724 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 725}
726
727static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
728 struct sta_info *sta)
729{
730 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
731 u32 changed = 0;
732
733 del_timer(&sta->plink_timer);
734 sta->plink_state = NL80211_PLINK_ESTAB;
735 changed |= mesh_plink_inc_estab_count(sdata);
736 changed |= mesh_set_ht_prot_mode(sdata);
737 changed |= mesh_set_short_slot_time(sdata);
738 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
739 ieee80211_mps_sta_status_update(sta);
740 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
741 return changed;
742}
743
c7e67811
TP		 744/**
745 * mesh_plink_fsm - step @sta MPM based on @event
746 *
747 * @sdata: interface
748 * @sta: mesh neighbor
749 * @event: peering event
750 *
751 * Return: changed MBSS flags
752 */
753static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
754 struct sta_info *sta, enum plink_event event)
755{
756 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
757 enum ieee80211_self_protected_actioncode action = 0;
758 u32 changed = 0;
759
760 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
761 mplstates[sta->plink_state], mplevents[event]);
762
48bf6bed 763 spin_lock_bh(&sta->plink_lock);
c7e67811
TP		 764 switch (sta->plink_state) {
765 case NL80211_PLINK_LISTEN:
766 switch (event) {
767 case CLS_ACPT:
768 mesh_plink_fsm_restart(sta);
769 break;
770 case OPN_ACPT:
771 sta->plink_state = NL80211_PLINK_OPN_RCVD;
204d1304 772 sta->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 773 mesh_plink_timer_set(sta,
774 mshcfg->dot11MeshRetryTimeout);
775
776 /* set the non-peer mode to active during peering */
777 changed |= ieee80211_mps_local_status_update(sdata);
778 action = WLAN_SP_MESH_PEERING_OPEN;
779 break;
780 default:
781 break;
782 }
783 break;
784 case NL80211_PLINK_OPN_SNT:
785 switch (event) {
786 case OPN_RJCT:
787 case CNF_RJCT:
788 case CLS_ACPT:
789 mesh_plink_close(sdata, sta, event);
790 action = WLAN_SP_MESH_PEERING_CLOSE;
791 break;
792 case OPN_ACPT:
793 /* retry timer is left untouched */
794 sta->plink_state = NL80211_PLINK_OPN_RCVD;
795 action = WLAN_SP_MESH_PEERING_CONFIRM;
796 break;
797 case CNF_ACPT:
798 sta->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 799 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 800 break;
801 default:
802 break;
803 }
804 break;
805 case NL80211_PLINK_OPN_RCVD:
806 switch (event) {
807 case OPN_RJCT:
808 case CNF_RJCT:
809 case CLS_ACPT:
810 mesh_plink_close(sdata, sta, event);
811 action = WLAN_SP_MESH_PEERING_CLOSE;
812 break;
813 case OPN_ACPT:
814 action = WLAN_SP_MESH_PEERING_CONFIRM;
815 break;
816 case CNF_ACPT:
817 changed |= mesh_plink_establish(sdata, sta);
818 break;
819 default:
820 break;
821 }
822 break;
823 case NL80211_PLINK_CNF_RCVD:
824 switch (event) {
825 case OPN_RJCT:
826 case CNF_RJCT:
827 case CLS_ACPT:
828 mesh_plink_close(sdata, sta, event);
829 action = WLAN_SP_MESH_PEERING_CLOSE;
830 break;
831 case OPN_ACPT:
832 changed |= mesh_plink_establish(sdata, sta);
833 action = WLAN_SP_MESH_PEERING_CONFIRM;
834 break;
835 default:
836 break;
837 }
838 break;
839 case NL80211_PLINK_ESTAB:
840 switch (event) {
841 case CLS_ACPT:
842 changed |= __mesh_plink_deactivate(sta);
843 changed |= mesh_set_ht_prot_mode(sdata);
844 changed |= mesh_set_short_slot_time(sdata);
845 mesh_plink_close(sdata, sta, event);
846 action = WLAN_SP_MESH_PEERING_CLOSE;
847 break;
848 case OPN_ACPT:
849 action = WLAN_SP_MESH_PEERING_CONFIRM;
850 break;
851 default:
852 break;
853 }
854 break;
855 case NL80211_PLINK_HOLDING:
856 switch (event) {
857 case CLS_ACPT:
2b470c39 858 del_timer(&sta->plink_timer);
c7e67811
TP		 859 mesh_plink_fsm_restart(sta);
860 break;
861 case OPN_ACPT:
862 case CNF_ACPT:
863 case OPN_RJCT:
864 case CNF_RJCT:
865 action = WLAN_SP_MESH_PEERING_CLOSE;
866 break;
867 default:
868 break;
869 }
870 break;
871 default:
872 /* should not get here, PLINK_BLOCKED is dealt with at the
873 * beginning of the function
874 */
875 break;
876 }
48bf6bed 877 spin_unlock_bh(&sta->plink_lock);
c7e67811
TP		 878 if (action) {
879 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
880 sta->llid, sta->plid, sta->reason);
881
882 /* also send confirm in open case */
883 if (action == WLAN_SP_MESH_PEERING_OPEN) {
884 mesh_plink_frame_tx(sdata,
885 WLAN_SP_MESH_PEERING_CONFIRM,
886 sta->sta.addr, sta->llid,
887 sta->plid, 0);
888 }
889 }
890
891 return changed;
892}
893
c99a89ed
TP		 894/*
895 * mesh_plink_get_event - get correct MPM event
896 *
897 * @sdata: interface
898 * @sta: peer, leave NULL if processing a frame from a new suitable peer
899 * @elems: peering management IEs
900 * @ftype: frame type
901 * @llid: peer's peer link ID
902 * @plid: peer's local link ID
903 *
904 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
905 * an error.
906 */
907static enum plink_event
908mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
909 struct sta_info *sta,
910 struct ieee802_11_elems *elems,
911 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 912 u16 llid, u16 plid)
c99a89ed
TP		 913{
914 enum plink_event event = PLINK_UNDEFINED;
915 u8 ie_len = elems->peering_len;
916 bool matches_local;
917
918 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
919 mesh_matches_local(sdata, elems));
920
921 /* deny open request from non-matching peer */
922 if (!matches_local && !sta) {
923 event = OPN_RJCT;
924 goto out;
925 }
926
927 if (!sta) {
928 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
929 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
930 goto out;
931 }
932 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
933 if (!mesh_plink_free_count(sdata)) {
934 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
935 goto out;
936 }
937 } else {
938 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
939 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
940 goto out;
941 }
942 if (sta->plink_state == NL80211_PLINK_BLOCKED)
943 goto out;
944 }
945
946 /* new matching peer */
947 if (!sta) {
948 event = OPN_ACPT;
949 goto out;
950 }
951
952 switch (ftype) {
953 case WLAN_SP_MESH_PEERING_OPEN:
954 if (!matches_local)
955 event = OPN_RJCT;
956 if (!mesh_plink_free_count(sdata) ||
957 (sta->plid && sta->plid != plid))
958 event = OPN_IGNR;
959 else
960 event = OPN_ACPT;
961 break;
962 case WLAN_SP_MESH_PEERING_CONFIRM:
963 if (!matches_local)
964 event = CNF_RJCT;
965 if (!mesh_plink_free_count(sdata) ||
6c6fa496
BC		 966 sta->llid != llid ||
967 (sta->plid && sta->plid != plid))
c99a89ed
TP		 968 event = CNF_IGNR;
969 else
970 event = CNF_ACPT;
971 break;
972 case WLAN_SP_MESH_PEERING_CLOSE:
973 if (sta->plink_state == NL80211_PLINK_ESTAB)
974 /* Do not check for llid or plid. This does not
975 * follow the standard but since multiple plinks
976 * per sta are not supported, it is necessary in
977 * order to avoid a livelock when MP A sees an
978 * establish peer link to MP B but MP B does not
979 * see it. This can be caused by a timeout in
980 * B's peer link establishment or B beign
981 * restarted.
982 */
983 event = CLS_ACPT;
984 else if (sta->plid != plid)
985 event = CLS_IGNR;
986 else if (ie_len == 8 && sta->llid != llid)
987 event = CLS_IGNR;
988 else
989 event = CLS_ACPT;
990 break;
991 default:
992 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
993 break;
994 }
995
996out:
997 return event;
998}
999
05a23ae9
TP		 1000static void
1001mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1002 struct ieee80211_mgmt *mgmt,
1003 struct ieee802_11_elems *elems)
c3896d2c 1004{
05a23ae9 1005
c3896d2c
LCC		 1006 struct sta_info *sta;
1007 enum plink_event event;
54ef656b 1008 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 1009 u32 changed = 0;
c99a89ed 1010 u8 ie_len = elems->peering_len;
6f101ef0 1011 u16 plid, llid = 0;
c3896d2c 1012
05a23ae9 1013 if (!elems->peering) {
bdcbd8e0
JB		 1014 mpl_dbg(sdata,
1015 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1016 return;
1017 }
bf7cd94d 1018
05a23ae9 1019 if (elems->rsn_len &&
bf7cd94d 1020 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1021 mpl_dbg(sdata,
1022 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1023 return;
1024 }
c3896d2c 1025
8db09850 1026 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1027 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1028 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1029 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1030 && ie_len != 8)) {
bdcbd8e0
JB		 1031 mpl_dbg(sdata,
1032 "Mesh plink: incorrect plink ie length %d %d\n",
1033 ftype, ie_len);
c3896d2c
LCC		 1034 return;
1035 }
1036
54ef656b 1037 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1038 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1039 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1040 return;
1041 }
1042 /* Note the lines below are correct, the llid in the frame is the plid
1043 * from the point of view of this host.
1044 */
f8134fed 1045 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1046 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1047 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1048 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1049
296fcba3 1050 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1051 rcu_read_lock();
1052
abe60632 1053 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1054
55335137 1055 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1056 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1057 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1058 mgmt->sa);
fc10302e 1059 goto unlock_rcu;
55335137
AN		 1060 }
1061
c3896d2c 1062 /* Now we will figure out the appropriate event... */
c99a89ed 1063 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1064
1065 if (event == OPN_ACPT) {
296fcba3 1066 rcu_read_unlock();
54ab1ffb 1067 /* allocate sta entry if necessary and update info */
05a23ae9 1068 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
54ab1ffb 1069 if (!sta) {
bdcbd8e0 1070 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1071 goto unlock_rcu;
54ab1ffb 1072 }
5bbdd6c6 1073 sta->plid = plid;
c99a89ed
TP		 1074 } else if (!sta && event == OPN_RJCT) {
1075 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1076 mgmt->sa, 0, plid,
6f101ef0 1077 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1078 goto unlock_rcu;
1079 } else if (!sta || event == PLINK_UNDEFINED) {
1080 /* something went wrong */
1081 goto unlock_rcu;
c3896d2c
LCC		 1082 }
1083
6c6fa496
BC		 1084 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1085 if (!sta->plid && event == CNF_ACPT)
1086 sta->plid = plid;
1087
c7e67811 1088 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1089
fc10302e 1090unlock_rcu:
d0709a65 1091 rcu_read_unlock();
57aac7c5 1092
ecccd072 1093 if (changed)
2b5e1967 1094 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1095}
05a23ae9
TP		 1096
1097void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1098 struct ieee80211_mgmt *mgmt, size_t len,
1099 struct ieee80211_rx_status *rx_status)
1100{
1101 struct ieee802_11_elems elems;
1102 size_t baselen;
1103 u8 *baseaddr;
1104
1105 /* need action_code, aux */
1106 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1107 return;
1108
1109 if (sdata->u.mesh.user_mpm)
1110 /* userspace must register for these */
1111 return;
1112
1113 if (is_multicast_ether_addr(mgmt->da)) {
1114 mpl_dbg(sdata,
1115 "Mesh plink: ignore frame from multicast address\n");
1116 return;
1117 }
1118
1119 baseaddr = mgmt->u.action.u.self_prot.variable;
1120 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1121 if (mgmt->u.action.u.self_prot.action_code ==
1122 WLAN_SP_MESH_PEERING_CONFIRM) {
1123 baseaddr += 4;
1124 baselen += 4;
b3e7de87
BC		 1125
1126 if (baselen > len)
1127 return;
05a23ae9
TP		 1128 }
1129 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1130 mesh_process_plink_frame(sdata, mgmt, &elems);
1131}
Linux 6.x block layer and io_uring tree(s)