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mesh_plink: use msecs_to_jiffies for proper time conversion
[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 *
07346f81 75 * Locking: this function must be called holding sta->lock
c3896d2c
LCC		 76 */
77static inline void mesh_plink_fsm_restart(struct sta_info *sta)
78{
57cf8043 79 sta->plink_state = NL80211_PLINK_LISTEN;
37659ff8
LCC		 80 sta->llid = sta->plid = sta->reason = 0;
81 sta->plink_retries = 0;
c3896d2c
LCC		 82}
83
3b144658
TP		 84/*
85 * mesh_set_short_slot_time - enable / disable ERP short slot time.
86 *
87 * The standard indirectly mandates mesh STAs to turn off short slot time by
88 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
89 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
90 * MBSS support ERP rates.
91 *
92 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
93 */
94static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
95{
96 struct ieee80211_local *local = sdata->local;
97 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
98 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
99 struct sta_info *sta;
100 u32 erp_rates = 0, changed = 0;
101 int i;
102 bool short_slot = false;
103
104 if (band == IEEE80211_BAND_5GHZ) {
105 /* (IEEE 802.11-2012 19.4.5) */
106 short_slot = true;
107 goto out;
108 } else if (band != IEEE80211_BAND_2GHZ ||
109 (band == IEEE80211_BAND_2GHZ &&
110 local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
111 goto out;
112
113 for (i = 0; i < sband->n_bitrates; i++)
114 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
115 erp_rates |= BIT(i);
116
117 if (!erp_rates)
118 goto out;
119
120 rcu_read_lock();
121 list_for_each_entry_rcu(sta, &local->sta_list, list) {
122 if (sdata != sta->sdata ||
123 sta->plink_state != NL80211_PLINK_ESTAB)
124 continue;
125
126 short_slot = false;
127 if (erp_rates & sta->sta.supp_rates[band])
128 short_slot = true;
129 else
130 break;
131 }
132 rcu_read_unlock();
133
134out:
135 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
136 sdata->vif.bss_conf.use_short_slot = short_slot;
137 changed = BSS_CHANGED_ERP_SLOT;
138 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
139 sdata->vif.addr, short_slot);
140 }
141 return changed;
142}
143
2c53040f 144/**
cbf9322e 145 * mesh_set_ht_prot_mode - set correct HT protection mode
57aac7c5 146 *
cbf9322e
AN		 147 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
148 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
149 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
150 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
151 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
152 * HT20 peer is present. Otherwise no-protection mode is selected.
57aac7c5
AN		 153 */
154static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
155{
156 struct ieee80211_local *local = sdata->local;
157 struct sta_info *sta;
57aac7c5
AN		 158 u16 ht_opmode;
159 bool non_ht_sta = false, ht20_sta = false;
160
0418a445
SW		 161 switch (sdata->vif.bss_conf.chandef.width) {
162 case NL80211_CHAN_WIDTH_20_NOHT:
163 case NL80211_CHAN_WIDTH_5:
164 case NL80211_CHAN_WIDTH_10:
57aac7c5 165 return 0;
0418a445
SW		 166 default:
167 break;
168 }
57aac7c5
AN		 169
170 rcu_read_lock();
171 list_for_each_entry_rcu(sta, &local->sta_list, list) {
cbf9322e
AN		 172 if (sdata != sta->sdata ||
173 sta->plink_state != NL80211_PLINK_ESTAB)
174 continue;
175
52ac8c48
TP		 176 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
177 continue;
178
179 if (!sta->sta.ht_cap.ht_supported) {
180 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
181 sta->sta.addr);
cbf9322e 182 non_ht_sta = true;
cbf9322e 183 break;
57aac7c5 184 }
52ac8c48
TP		 185
186 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
187 ht20_sta = true;
57aac7c5 188 }
57aac7c5
AN		 189 rcu_read_unlock();
190
191 if (non_ht_sta)
192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
466f310d 193 else if (ht20_sta &&
4bf88530 194 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
57aac7c5
AN		 195 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
196 else
197 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
198
52ac8c48
TP		 199 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
200 return 0;
57aac7c5 201
52ac8c48
TP		 202 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
203 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
204 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
205 return BSS_CHANGED_HT;
57aac7c5
AN		 206}
207
c3896d2c 208/**
c9370197 209 * __mesh_plink_deactivate - deactivate mesh peer link
c3896d2c
LCC		 210 *
211 * @sta: mesh peer link to deactivate
212 *
213 * All mesh paths with this peer as next hop will be flushed
df323818 214 * Returns beacon changed flag if the beacon content changed.
c3896d2c 215 *
07346f81 216 * Locking: the caller must hold sta->lock
c3896d2c 217 */
df323818 218static u32 __mesh_plink_deactivate(struct sta_info *sta)
c3896d2c 219{
d0709a65 220 struct ieee80211_sub_if_data *sdata = sta->sdata;
df323818 221 u32 changed = 0;
d0709a65 222
df323818
MP		 223 if (sta->plink_state == NL80211_PLINK_ESTAB)
224 changed = mesh_plink_dec_estab_count(sdata);
57cf8043 225 sta->plink_state = NL80211_PLINK_BLOCKED;
c3896d2c 226 mesh_path_flush_by_nexthop(sta);
c9370197 227
3f52b7e3 228 ieee80211_mps_sta_status_update(sta);
446075d7
MP		 229 changed |= ieee80211_mps_set_sta_local_pm(sta,
230 NL80211_MESH_POWER_UNKNOWN);
3f52b7e3 231
df323818 232 return changed;
c3896d2c
LCC		 233}
234
902acc78 235/**
c9370197 236 * mesh_plink_deactivate - deactivate mesh peer link
902acc78
JB		 237 *
238 * @sta: mesh peer link to deactivate
239 *
240 * All mesh paths with this peer as next hop will be flushed
241 */
45b5028e 242u32 mesh_plink_deactivate(struct sta_info *sta)
902acc78 243{
c9370197 244 struct ieee80211_sub_if_data *sdata = sta->sdata;
df323818 245 u32 changed;
c9370197 246
07346f81 247 spin_lock_bh(&sta->lock);
df323818 248 changed = __mesh_plink_deactivate(sta);
6f101ef0 249 sta->reason = WLAN_REASON_MESH_PEER_CANCELED;
ba4a14e1
TP		 250 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
251 sta->sta.addr, sta->llid, sta->plid,
252 sta->reason);
07346f81 253 spin_unlock_bh(&sta->lock);
c9370197 254
45b5028e 255 return changed;
902acc78
JB		 256}
257
f698d856 258static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
bf7cd94d 259 enum ieee80211_self_protected_actioncode action,
6f101ef0 260 u8 *da, u16 llid, u16 plid, u16 reason)
bf7cd94d 261{
f698d856 262 struct ieee80211_local *local = sdata->local;
3b69a9c5 263 struct sk_buff *skb;
e7570dfb 264 struct ieee80211_tx_info *info;
c3896d2c
LCC		 265 struct ieee80211_mgmt *mgmt;
266 bool include_plid = false;
8db09850 267 u16 peering_proto = 0;
3b69a9c5
TP		 268 u8 *pos, ie_len = 4;
269 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
270 sizeof(mgmt->u.action.u.self_prot);
f609a43d 271 int err = -ENOMEM;
3b69a9c5 272
65e8b0cc 273 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 274 hdr_len +
275 2 + /* capability info */
276 2 + /* AID */
277 2 + 8 + /* supported rates */
278 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
279 2 + sdata->u.mesh.mesh_id_len +
280 2 + sizeof(struct ieee80211_meshconf_ie) +
176f3608 281 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 282 2 + sizeof(struct ieee80211_ht_operation) +
3b69a9c5
TP		 283 2 + 8 + /* peering IE */
284 sdata->u.mesh.ie_len);
c3896d2c 285 if (!skb)
87d84c45 286 return err;
e7570dfb 287 info = IEEE80211_SKB_CB(skb);
65e8b0cc 288 skb_reserve(skb, local->tx_headroom);
3b69a9c5
TP		 289 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
290 memset(mgmt, 0, hdr_len);
e7827a70
HH		 291 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
292 IEEE80211_STYPE_ACTION);
c3896d2c 293 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 294 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 295 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 296 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
297 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 298
8db09850 299 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
55de908a
JB		 300 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
301
8db09850
TP		 302 /* capability info */
303 pos = skb_put(skb, 2);
304 memset(pos, 0, 2);
54ef656b 305 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 306 /* AID */
307 pos = skb_put(skb, 2);
6f101ef0 308 put_unaligned_le16(plid, pos + 2);
c3896d2c 309 }
55de908a
JB		 310 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
311 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 312 mesh_add_rsn_ie(sdata, skb) ||
313 mesh_add_meshid_ie(sdata, skb) ||
314 mesh_add_meshconf_ie(sdata, skb))
f609a43d 315 goto free;
8db09850 316 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 317 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 318 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 319 goto free;
c3896d2c
LCC		 320 }
321
8db09850 322 /* Add Mesh Peering Management element */
c3896d2c 323 switch (action) {
54ef656b 324 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 325 break;
54ef656b 326 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 327 ie_len += 2;
c3896d2c
LCC		 328 include_plid = true;
329 break;
54ef656b 330 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 331 if (plid) {
332 ie_len += 2;
c3896d2c
LCC		 333 include_plid = true;
334 }
8db09850 335 ie_len += 2; /* reason code */
c3896d2c 336 break;
8db09850 337 default:
f609a43d
TP		 338 err = -EINVAL;
339 goto free;
c3896d2c
LCC		 340 }
341
8db09850 342 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 343 goto free;
8db09850 344
c3896d2c 345 pos = skb_put(skb, 2 + ie_len);
8db09850 346 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 347 *pos++ = ie_len;
8db09850
TP		 348 memcpy(pos, &peering_proto, 2);
349 pos += 2;
6f101ef0 350 put_unaligned_le16(llid, pos);
8db09850 351 pos += 2;
c3896d2c 352 if (include_plid) {
6f101ef0 353 put_unaligned_le16(plid, pos);
8db09850 354 pos += 2;
c3896d2c 355 }
54ef656b 356 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 357 put_unaligned_le16(reason, pos);
8db09850 358 pos += 2;
c3896d2c 359 }
176f3608
TP		 360
361 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d
JB		 362 if (mesh_add_ht_cap_ie(sdata, skb) ||
363 mesh_add_ht_oper_ie(sdata, skb))
f609a43d 364 goto free;
176f3608
TP		 365 }
366
bf7cd94d 367 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 368 goto free;
c3896d2c 369
62ae67be 370 ieee80211_tx_skb(sdata, skb);
c3896d2c 371 return 0;
f609a43d
TP		 372free:
373 kfree_skb(skb);
374 return err;
c3896d2c
LCC		 375}
376
296fcba3
TP		 377static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
378 struct sta_info *sta,
379 struct ieee802_11_elems *elems, bool insert)
c3896d2c 380{
f698d856 381 struct ieee80211_local *local = sdata->local;
55de908a 382 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
54ab1ffb 383 struct ieee80211_supported_band *sband;
f68d776a 384 u32 rates, basic_rates = 0, changed = 0;
c3896d2c 385
f743ff49 386 sband = local->hw.wiphy->bands[band];
2103dec1 387 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
d0709a65 388
54ab1ffb 389 spin_lock_bh(&sta->lock);
c3896d2c 390 sta->last_rx = jiffies;
296fcba3
TP		 391
392 /* rates and capabilities don't change during peering */
393 if (sta->plink_state == NL80211_PLINK_ESTAB)
394 goto out;
bae35d92 395
f68d776a
TP		 396 if (sta->sta.supp_rates[band] != rates)
397 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
f743ff49 398 sta->sta.supp_rates[band] = rates;
54ab1ffb 399
52ac8c48
TP		 400 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
401 elems->ht_cap_elem, sta))
402 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 403
52ac8c48
TP		 404 /* HT peer is operating 20MHz-only */
405 if (elems->ht_operation &&
406 !(elems->ht_operation->ht_param &
407 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
408 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 409 changed |= IEEE80211_RC_BW_CHANGED;
52ac8c48 410 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 411 }
c7d25828 412
59cf1d65
HS		 413 if (insert)
414 rate_control_rate_init(sta);
f68d776a
TP		 415 else
416 rate_control_rate_update(local, sband, sta, changed);
296fcba3 417out:
54ab1ffb 418 spin_unlock_bh(&sta->lock);
296fcba3
TP		 419}
420
421static struct sta_info *
422__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
423{
424 struct sta_info *sta;
54ab1ffb 425
296fcba3 426 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 427 return NULL;
428
296fcba3
TP		 429 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
430 if (!sta)
431 return NULL;
432
433 sta->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 434 sta->sta.wme = true;
296fcba3
TP		 435
436 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
437 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
438 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
439
296fcba3
TP		 440 return sta;
441}
442
443static struct sta_info *
444mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
445 struct ieee802_11_elems *elems)
446{
447 struct sta_info *sta = NULL;
448
a6dad6a2
TP		 449 /* Userspace handles station allocation */
450 if (sdata->u.mesh.user_mpm ||
451 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
296fcba3
TP		 452 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
453 elems->ie_start,
454 elems->total_len,
455 GFP_KERNEL);
456 else
457 sta = __mesh_sta_info_alloc(sdata, addr);
458
54ab1ffb
TP		 459 return sta;
460}
461
296fcba3
TP		 462/*
463 * mesh_sta_info_get - return mesh sta info entry for @addr.
464 *
465 * @sdata: local meshif
466 * @addr: peer's address
467 * @elems: IEs from beacon or mesh peering frame.
468 *
469 * Return existing or newly allocated sta_info under RCU read lock.
470 * (re)initialize with given IEs.
471 */
472static struct sta_info *
473mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
474 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
475{
476 struct sta_info *sta = NULL;
477
478 rcu_read_lock();
479 sta = sta_info_get(sdata, addr);
480 if (sta) {
481 mesh_sta_info_init(sdata, sta, elems, false);
482 } else {
483 rcu_read_unlock();
484 /* can't run atomic */
485 sta = mesh_sta_info_alloc(sdata, addr, elems);
486 if (!sta) {
487 rcu_read_lock();
488 return NULL;
489 }
490
3b4797bc
TP		 491 mesh_sta_info_init(sdata, sta, elems, true);
492
296fcba3
TP		 493 if (sta_info_insert_rcu(sta))
494 return NULL;
495 }
496
497 return sta;
498}
499
500/*
501 * mesh_neighbour_update - update or initialize new mesh neighbor.
502 *
503 * @sdata: local meshif
504 * @addr: peer's address
505 * @elems: IEs from beacon or mesh peering frame
506 *
507 * Initiates peering if appropriate.
508 */
f743ff49
TP		 509void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
510 u8 *hw_addr,
54ab1ffb
TP		 511 struct ieee802_11_elems *elems)
512{
513 struct sta_info *sta;
39886b61 514 u32 changed = 0;
54ab1ffb 515
296fcba3 516 sta = mesh_sta_info_get(sdata, hw_addr, elems);
54ab1ffb
TP		 517 if (!sta)
518 goto out;
519
1570ca59 520 if (mesh_peer_accepts_plinks(elems) &&
54ab1ffb
TP		 521 sta->plink_state == NL80211_PLINK_LISTEN &&
522 sdata->u.mesh.accepting_plinks &&
523 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 524 rssi_threshold_check(sdata, sta))
39886b61 525 changed = mesh_plink_open(sta);
c3896d2c 526
3f52b7e3 527 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 528out:
d0709a65 529 rcu_read_unlock();
2b5e1967 530 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 531}
532
533static void mesh_plink_timer(unsigned long data)
534{
535 struct sta_info *sta;
6f101ef0 536 u16 reason = 0;
c3896d2c 537 struct ieee80211_sub_if_data *sdata;
453e66f2 538 struct mesh_config *mshcfg;
4efec451 539 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 540
d0709a65
JB		 541 /*
542 * This STA is valid because sta_info_destroy() will
543 * del_timer_sync() this timer after having made sure
544 * it cannot be readded (by deleting the plink.)
545 */
c3896d2c
LCC		 546 sta = (struct sta_info *) data;
547
690205f1 548 if (sta->sdata->local->quiescing)
5bb644a0 549 return;
5bb644a0 550
07346f81 551 spin_lock_bh(&sta->lock);
2b470c39
BC		 552
553 /* If a timer fires just before a state transition on another CPU,
554 * we may have already extended the timeout and changed state by the
555 * time we've acquired the lock and arrived here. In that case,
556 * skip this timer and wait for the new one.
557 */
558 if (time_before(jiffies, sta->plink_timer.expires)) {
559 mpl_dbg(sta->sdata,
560 "Ignoring timer for %pM in state %s (timer adjusted)",
561 sta->sta.addr, mplstates[sta->plink_state]);
07346f81 562 spin_unlock_bh(&sta->lock);
c3896d2c
LCC		 563 return;
564 }
2b470c39
BC		 565
566 /* del_timer() and handler may race when entering these states */
567 if (sta->plink_state == NL80211_PLINK_LISTEN ||
568 sta->plink_state == NL80211_PLINK_ESTAB) {
569 mpl_dbg(sta->sdata,
570 "Ignoring timer for %pM in state %s (timer deleted)",
571 sta->sta.addr, mplstates[sta->plink_state]);
572 spin_unlock_bh(&sta->lock);
573 return;
574 }
575
bdcbd8e0 576 mpl_dbg(sta->sdata,
3088f7d2
TP		 577 "Mesh plink timer for %pM fired on state %s\n",
578 sta->sta.addr, mplstates[sta->plink_state]);
d0709a65 579 sdata = sta->sdata;
453e66f2 580 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c
LCC		 581
582 switch (sta->plink_state) {
57cf8043
JC		 583 case NL80211_PLINK_OPN_RCVD:
584 case NL80211_PLINK_OPN_SNT:
c3896d2c 585 /* retry timer */
453e66f2 586 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 587 u32 rand;
bdcbd8e0
JB		 588 mpl_dbg(sta->sdata,
589 "Mesh plink for %pM (retry, timeout): %d %d\n",
0c68ae26
JB		 590 sta->sta.addr, sta->plink_retries,
591 sta->plink_timeout);
c3896d2c
LCC		 592 get_random_bytes(&rand, sizeof(u32));
593 sta->plink_timeout = sta->plink_timeout +
594 rand % sta->plink_timeout;
595 ++sta->plink_retries;
d0709a65 596 mod_plink_timer(sta, sta->plink_timeout);
4efec451 597 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 598 break;
599 }
6f101ef0 600 reason = WLAN_REASON_MESH_MAX_RETRIES;
c3896d2c 601 /* fall through on else */
57cf8043 602 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 603 /* confirm timer */
604 if (!reason)
6f101ef0 605 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
57cf8043 606 sta->plink_state = NL80211_PLINK_HOLDING;
453e66f2 607 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 608 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 609 break;
57cf8043 610 case NL80211_PLINK_HOLDING:
c3896d2c 611 /* holding timer */
d0709a65 612 del_timer(&sta->plink_timer);
c3896d2c 613 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 614 break;
615 default:
c3896d2c
LCC		 616 break;
617 }
0f5ffd24 618 spin_unlock_bh(&sta->lock);
4efec451
TP		 619 if (action)
620 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
6f101ef0 621 sta->llid, sta->plid, reason);
c3896d2c
LCC		 622}
623
624static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
625{
cc57ac53 626 sta->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
c3896d2c
LCC		 627 sta->plink_timer.data = (unsigned long) sta;
628 sta->plink_timer.function = mesh_plink_timer;
629 sta->plink_timeout = timeout;
c3896d2c
LCC		 630 add_timer(&sta->plink_timer);
631}
632
204d1304 633static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 634 u16 llid)
204d1304
TP		 635{
636 struct ieee80211_local *local = sdata->local;
637 bool in_use = false;
638 struct sta_info *sta;
639
640 rcu_read_lock();
641 list_for_each_entry_rcu(sta, &local->sta_list, list) {
642 if (!memcmp(&sta->llid, &llid, sizeof(llid))) {
643 in_use = true;
644 break;
645 }
646 }
647 rcu_read_unlock();
648
649 return in_use;
650}
651
6f101ef0 652static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 653{
654 u16 llid;
655
656 do {
657 get_random_bytes(&llid, sizeof(llid));
658 /* for mesh PS we still only have the AID range for TIM bits */
659 llid = (llid % IEEE80211_MAX_AID) + 1;
6f101ef0 660 } while (llid_in_use(sdata, llid));
204d1304 661
6f101ef0 662 return llid;
204d1304
TP		 663}
664
39886b61 665u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 666{
d0709a65 667 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 668 u32 changed;
c3896d2c 669
c2c98fde 670 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 671 return 0;
53e80511 672
07346f81 673 spin_lock_bh(&sta->lock);
204d1304 674 sta->llid = mesh_get_new_llid(sdata);
9385d04f
CYY		 675 if (sta->plink_state != NL80211_PLINK_LISTEN &&
676 sta->plink_state != NL80211_PLINK_BLOCKED) {
07346f81 677 spin_unlock_bh(&sta->lock);
39886b61 678 return 0;
c3896d2c 679 }
57cf8043 680 sta->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 681 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
07346f81 682 spin_unlock_bh(&sta->lock);
bdcbd8e0
JB		 683 mpl_dbg(sdata,
684 "Mesh plink: starting establishment with %pM\n",
0c68ae26 685 sta->sta.addr);
c3896d2c 686
3f52b7e3 687 /* set the non-peer mode to active during peering */
39886b61 688 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 689
39886b61 690 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
204d1304 691 sta->sta.addr, sta->llid, 0, 0);
39886b61 692 return changed;
c3896d2c
LCC		 693}
694
39886b61 695u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 696{
df323818 697 u32 changed;
c9370197 698
07346f81 699 spin_lock_bh(&sta->lock);
df323818 700 changed = __mesh_plink_deactivate(sta);
57cf8043 701 sta->plink_state = NL80211_PLINK_BLOCKED;
07346f81 702 spin_unlock_bh(&sta->lock);
c9370197 703
39886b61 704 return changed;
c3896d2c
LCC		 705}
706
e76d67f0
BC		 707static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
708 struct sta_info *sta,
709 enum plink_event event)
710{
711 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
712
6f101ef0
CYY		 713 u16 reason = (event == CLS_ACPT) ?
714 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0
BC		 715
716 sta->reason = reason;
717 sta->plink_state = NL80211_PLINK_HOLDING;
272a9e26 718 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 719}
720
721static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
722 struct sta_info *sta)
723{
724 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
725 u32 changed = 0;
726
727 del_timer(&sta->plink_timer);
728 sta->plink_state = NL80211_PLINK_ESTAB;
729 changed |= mesh_plink_inc_estab_count(sdata);
730 changed |= mesh_set_ht_prot_mode(sdata);
731 changed |= mesh_set_short_slot_time(sdata);
732 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
733 ieee80211_mps_sta_status_update(sta);
734 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
735 return changed;
736}
737
c7e67811
TP		 738/**
739 * mesh_plink_fsm - step @sta MPM based on @event
740 *
741 * @sdata: interface
742 * @sta: mesh neighbor
743 * @event: peering event
744 *
745 * Return: changed MBSS flags
746 */
747static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
748 struct sta_info *sta, enum plink_event event)
749{
750 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
751 enum ieee80211_self_protected_actioncode action = 0;
752 u32 changed = 0;
753
754 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
755 mplstates[sta->plink_state], mplevents[event]);
756
757 spin_lock_bh(&sta->lock);
758 switch (sta->plink_state) {
759 case NL80211_PLINK_LISTEN:
760 switch (event) {
761 case CLS_ACPT:
762 mesh_plink_fsm_restart(sta);
763 break;
764 case OPN_ACPT:
765 sta->plink_state = NL80211_PLINK_OPN_RCVD;
204d1304 766 sta->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 767 mesh_plink_timer_set(sta,
768 mshcfg->dot11MeshRetryTimeout);
769
770 /* set the non-peer mode to active during peering */
771 changed |= ieee80211_mps_local_status_update(sdata);
772 action = WLAN_SP_MESH_PEERING_OPEN;
773 break;
774 default:
775 break;
776 }
777 break;
778 case NL80211_PLINK_OPN_SNT:
779 switch (event) {
780 case OPN_RJCT:
781 case CNF_RJCT:
782 case CLS_ACPT:
783 mesh_plink_close(sdata, sta, event);
784 action = WLAN_SP_MESH_PEERING_CLOSE;
785 break;
786 case OPN_ACPT:
787 /* retry timer is left untouched */
788 sta->plink_state = NL80211_PLINK_OPN_RCVD;
789 action = WLAN_SP_MESH_PEERING_CONFIRM;
790 break;
791 case CNF_ACPT:
792 sta->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 793 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 794 break;
795 default:
796 break;
797 }
798 break;
799 case NL80211_PLINK_OPN_RCVD:
800 switch (event) {
801 case OPN_RJCT:
802 case CNF_RJCT:
803 case CLS_ACPT:
804 mesh_plink_close(sdata, sta, event);
805 action = WLAN_SP_MESH_PEERING_CLOSE;
806 break;
807 case OPN_ACPT:
808 action = WLAN_SP_MESH_PEERING_CONFIRM;
809 break;
810 case CNF_ACPT:
811 changed |= mesh_plink_establish(sdata, sta);
812 break;
813 default:
814 break;
815 }
816 break;
817 case NL80211_PLINK_CNF_RCVD:
818 switch (event) {
819 case OPN_RJCT:
820 case CNF_RJCT:
821 case CLS_ACPT:
822 mesh_plink_close(sdata, sta, event);
823 action = WLAN_SP_MESH_PEERING_CLOSE;
824 break;
825 case OPN_ACPT:
826 changed |= mesh_plink_establish(sdata, sta);
827 action = WLAN_SP_MESH_PEERING_CONFIRM;
828 break;
829 default:
830 break;
831 }
832 break;
833 case NL80211_PLINK_ESTAB:
834 switch (event) {
835 case CLS_ACPT:
836 changed |= __mesh_plink_deactivate(sta);
837 changed |= mesh_set_ht_prot_mode(sdata);
838 changed |= mesh_set_short_slot_time(sdata);
839 mesh_plink_close(sdata, sta, event);
840 action = WLAN_SP_MESH_PEERING_CLOSE;
841 break;
842 case OPN_ACPT:
843 action = WLAN_SP_MESH_PEERING_CONFIRM;
844 break;
845 default:
846 break;
847 }
848 break;
849 case NL80211_PLINK_HOLDING:
850 switch (event) {
851 case CLS_ACPT:
2b470c39 852 del_timer(&sta->plink_timer);
c7e67811
TP		 853 mesh_plink_fsm_restart(sta);
854 break;
855 case OPN_ACPT:
856 case CNF_ACPT:
857 case OPN_RJCT:
858 case CNF_RJCT:
859 action = WLAN_SP_MESH_PEERING_CLOSE;
860 break;
861 default:
862 break;
863 }
864 break;
865 default:
866 /* should not get here, PLINK_BLOCKED is dealt with at the
867 * beginning of the function
868 */
869 break;
870 }
871 spin_unlock_bh(&sta->lock);
872 if (action) {
873 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
874 sta->llid, sta->plid, sta->reason);
875
876 /* also send confirm in open case */
877 if (action == WLAN_SP_MESH_PEERING_OPEN) {
878 mesh_plink_frame_tx(sdata,
879 WLAN_SP_MESH_PEERING_CONFIRM,
880 sta->sta.addr, sta->llid,
881 sta->plid, 0);
882 }
883 }
884
885 return changed;
886}
887
c99a89ed
TP		 888/*
889 * mesh_plink_get_event - get correct MPM event
890 *
891 * @sdata: interface
892 * @sta: peer, leave NULL if processing a frame from a new suitable peer
893 * @elems: peering management IEs
894 * @ftype: frame type
895 * @llid: peer's peer link ID
896 * @plid: peer's local link ID
897 *
898 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
899 * an error.
900 */
901static enum plink_event
902mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
903 struct sta_info *sta,
904 struct ieee802_11_elems *elems,
905 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 906 u16 llid, u16 plid)
c99a89ed
TP		 907{
908 enum plink_event event = PLINK_UNDEFINED;
909 u8 ie_len = elems->peering_len;
910 bool matches_local;
911
912 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
913 mesh_matches_local(sdata, elems));
914
915 /* deny open request from non-matching peer */
916 if (!matches_local && !sta) {
917 event = OPN_RJCT;
918 goto out;
919 }
920
921 if (!sta) {
922 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
923 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
924 goto out;
925 }
926 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
927 if (!mesh_plink_free_count(sdata)) {
928 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
929 goto out;
930 }
931 } else {
932 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
933 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
934 goto out;
935 }
936 if (sta->plink_state == NL80211_PLINK_BLOCKED)
937 goto out;
938 }
939
940 /* new matching peer */
941 if (!sta) {
942 event = OPN_ACPT;
943 goto out;
944 }
945
946 switch (ftype) {
947 case WLAN_SP_MESH_PEERING_OPEN:
948 if (!matches_local)
949 event = OPN_RJCT;
950 if (!mesh_plink_free_count(sdata) ||
951 (sta->plid && sta->plid != plid))
952 event = OPN_IGNR;
953 else
954 event = OPN_ACPT;
955 break;
956 case WLAN_SP_MESH_PEERING_CONFIRM:
957 if (!matches_local)
958 event = CNF_RJCT;
959 if (!mesh_plink_free_count(sdata) ||
6c6fa496
BC		 960 sta->llid != llid ||
961 (sta->plid && sta->plid != plid))
c99a89ed
TP		 962 event = CNF_IGNR;
963 else
964 event = CNF_ACPT;
965 break;
966 case WLAN_SP_MESH_PEERING_CLOSE:
967 if (sta->plink_state == NL80211_PLINK_ESTAB)
968 /* Do not check for llid or plid. This does not
969 * follow the standard but since multiple plinks
970 * per sta are not supported, it is necessary in
971 * order to avoid a livelock when MP A sees an
972 * establish peer link to MP B but MP B does not
973 * see it. This can be caused by a timeout in
974 * B's peer link establishment or B beign
975 * restarted.
976 */
977 event = CLS_ACPT;
978 else if (sta->plid != plid)
979 event = CLS_IGNR;
980 else if (ie_len == 8 && sta->llid != llid)
981 event = CLS_IGNR;
982 else
983 event = CLS_ACPT;
984 break;
985 default:
986 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
987 break;
988 }
989
990out:
991 return event;
992}
993
05a23ae9
TP		 994static void
995mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
996 struct ieee80211_mgmt *mgmt,
997 struct ieee802_11_elems *elems)
c3896d2c 998{
05a23ae9 999
c3896d2c
LCC		 1000 struct sta_info *sta;
1001 enum plink_event event;
54ef656b 1002 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 1003 u32 changed = 0;
c99a89ed 1004 u8 ie_len = elems->peering_len;
6f101ef0 1005 u16 plid, llid = 0;
c3896d2c 1006
05a23ae9 1007 if (!elems->peering) {
bdcbd8e0
JB		 1008 mpl_dbg(sdata,
1009 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1010 return;
1011 }
bf7cd94d 1012
05a23ae9 1013 if (elems->rsn_len &&
bf7cd94d 1014 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1015 mpl_dbg(sdata,
1016 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1017 return;
1018 }
c3896d2c 1019
8db09850 1020 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1021 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1022 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1023 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1024 && ie_len != 8)) {
bdcbd8e0
JB		 1025 mpl_dbg(sdata,
1026 "Mesh plink: incorrect plink ie length %d %d\n",
1027 ftype, ie_len);
c3896d2c
LCC		 1028 return;
1029 }
1030
54ef656b 1031 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1032 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1033 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1034 return;
1035 }
1036 /* Note the lines below are correct, the llid in the frame is the plid
1037 * from the point of view of this host.
1038 */
f8134fed 1039 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1040 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1041 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1042 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1043
296fcba3 1044 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1045 rcu_read_lock();
1046
abe60632 1047 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1048
55335137 1049 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1050 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1051 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1052 mgmt->sa);
fc10302e 1053 goto unlock_rcu;
55335137
AN		 1054 }
1055
c3896d2c 1056 /* Now we will figure out the appropriate event... */
c99a89ed 1057 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1058
1059 if (event == OPN_ACPT) {
296fcba3 1060 rcu_read_unlock();
54ab1ffb 1061 /* allocate sta entry if necessary and update info */
05a23ae9 1062 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
54ab1ffb 1063 if (!sta) {
bdcbd8e0 1064 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1065 goto unlock_rcu;
54ab1ffb 1066 }
5bbdd6c6 1067 sta->plid = plid;
c99a89ed
TP		 1068 } else if (!sta && event == OPN_RJCT) {
1069 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1070 mgmt->sa, 0, plid,
6f101ef0 1071 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1072 goto unlock_rcu;
1073 } else if (!sta || event == PLINK_UNDEFINED) {
1074 /* something went wrong */
1075 goto unlock_rcu;
c3896d2c
LCC		 1076 }
1077
6c6fa496
BC		 1078 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1079 if (!sta->plid && event == CNF_ACPT)
1080 sta->plid = plid;
1081
c7e67811 1082 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1083
fc10302e 1084unlock_rcu:
d0709a65 1085 rcu_read_unlock();
57aac7c5 1086
ecccd072 1087 if (changed)
2b5e1967 1088 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1089}
05a23ae9
TP		 1090
1091void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1092 struct ieee80211_mgmt *mgmt, size_t len,
1093 struct ieee80211_rx_status *rx_status)
1094{
1095 struct ieee802_11_elems elems;
1096 size_t baselen;
1097 u8 *baseaddr;
1098
1099 /* need action_code, aux */
1100 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1101 return;
1102
1103 if (sdata->u.mesh.user_mpm)
1104 /* userspace must register for these */
1105 return;
1106
1107 if (is_multicast_ether_addr(mgmt->da)) {
1108 mpl_dbg(sdata,
1109 "Mesh plink: ignore frame from multicast address\n");
1110 return;
1111 }
1112
1113 baseaddr = mgmt->u.action.u.self_prot.variable;
1114 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1115 if (mgmt->u.action.u.self_prot.action_code ==
1116 WLAN_SP_MESH_PEERING_CONFIRM) {
1117 baseaddr += 4;
1118 baselen += 4;
1119 }
1120 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1121 mesh_process_plink_frame(sdata, mgmt, &elems);
1122}
Linux 6.x block layer and io_uring tree(s)