projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
blk-mq: clear q->mq_ops if init fail
[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
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
JB		 63 (sta &&
64 (s8)-ewma_signal_read(&sta->rx_stats.avg_signal) >
65 rssi_threshold);
36c9bb29
BC		 66}
67
c3896d2c
LCC		 68/**
69 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
70 *
23c7a29c 71 * @sta: mesh peer link to restart
c3896d2c 72 *
433f5bc1 73 * Locking: this function must be called holding sta->mesh->plink_lock
c3896d2c
LCC		 74 */
75static inline void mesh_plink_fsm_restart(struct sta_info *sta)
76{
433f5bc1
JB		 77 lockdep_assert_held(&sta->mesh->plink_lock);
78 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
79 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
80 sta->mesh->plink_retries = 0;
c3896d2c
LCC		 81}
82
3b144658
TP		 83/*
84 * mesh_set_short_slot_time - enable / disable ERP short slot time.
85 *
86 * The standard indirectly mandates mesh STAs to turn off short slot time by
87 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
88 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
89 * MBSS support ERP rates.
90 *
91 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
92 */
93static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
94{
95 struct ieee80211_local *local = sdata->local;
96 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
97 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
98 struct sta_info *sta;
99 u32 erp_rates = 0, changed = 0;
100 int i;
101 bool short_slot = false;
102
103 if (band == IEEE80211_BAND_5GHZ) {
104 /* (IEEE 802.11-2012 19.4.5) */
105 short_slot = true;
106 goto out;
ea1b2b45 107 } else if (band != IEEE80211_BAND_2GHZ)
3b144658
TP		 108 goto out;
109
110 for (i = 0; i < sband->n_bitrates; i++)
111 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
112 erp_rates |= BIT(i);
113
114 if (!erp_rates)
115 goto out;
116
117 rcu_read_lock();
118 list_for_each_entry_rcu(sta, &local->sta_list, list) {
119 if (sdata != sta->sdata ||
433f5bc1 120 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
3b144658
TP		 121 continue;
122
123 short_slot = false;
124 if (erp_rates & sta->sta.supp_rates[band])
125 short_slot = true;
126 else
127 break;
128 }
129 rcu_read_unlock();
130
131out:
132 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
133 sdata->vif.bss_conf.use_short_slot = short_slot;
134 changed = BSS_CHANGED_ERP_SLOT;
135 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
136 sdata->vif.addr, short_slot);
137 }
138 return changed;
139}
140
2c53040f 141/**
cbf9322e 142 * mesh_set_ht_prot_mode - set correct HT protection mode
57aac7c5 143 *
cbf9322e
AN		 144 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
145 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
146 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
147 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
148 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
149 * HT20 peer is present. Otherwise no-protection mode is selected.
57aac7c5
AN		 150 */
151static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
152{
153 struct ieee80211_local *local = sdata->local;
154 struct sta_info *sta;
57aac7c5
AN		 155 u16 ht_opmode;
156 bool non_ht_sta = false, ht20_sta = false;
157
0418a445
SW		 158 switch (sdata->vif.bss_conf.chandef.width) {
159 case NL80211_CHAN_WIDTH_20_NOHT:
160 case NL80211_CHAN_WIDTH_5:
161 case NL80211_CHAN_WIDTH_10:
57aac7c5 162 return 0;
0418a445
SW		 163 default:
164 break;
165 }
57aac7c5
AN		 166
167 rcu_read_lock();
168 list_for_each_entry_rcu(sta, &local->sta_list, list) {
cbf9322e 169 if (sdata != sta->sdata ||
433f5bc1 170 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
cbf9322e
AN		 171 continue;
172
52ac8c48
TP		 173 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
174 continue;
175
176 if (!sta->sta.ht_cap.ht_supported) {
177 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
178 sta->sta.addr);
cbf9322e 179 non_ht_sta = true;
cbf9322e 180 break;
57aac7c5 181 }
52ac8c48
TP		 182
183 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
184 ht20_sta = true;
57aac7c5 185 }
57aac7c5
AN		 186 rcu_read_unlock();
187
188 if (non_ht_sta)
189 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
466f310d 190 else if (ht20_sta &&
4bf88530 191 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
57aac7c5
AN		 192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
193 else
194 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
195
52ac8c48
TP		 196 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
197 return 0;
57aac7c5 198
52ac8c48
TP		 199 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
200 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
201 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
202 return BSS_CHANGED_HT;
57aac7c5
AN		 203}
204
f698d856 205static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
a69bd8e6 206 struct sta_info *sta,
bf7cd94d 207 enum ieee80211_self_protected_actioncode action,
6f101ef0 208 u8 *da, u16 llid, u16 plid, u16 reason)
bf7cd94d 209{
f698d856 210 struct ieee80211_local *local = sdata->local;
3b69a9c5 211 struct sk_buff *skb;
e7570dfb 212 struct ieee80211_tx_info *info;
c3896d2c
LCC		 213 struct ieee80211_mgmt *mgmt;
214 bool include_plid = false;
8db09850 215 u16 peering_proto = 0;
3b69a9c5
TP		 216 u8 *pos, ie_len = 4;
217 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
218 sizeof(mgmt->u.action.u.self_prot);
f609a43d 219 int err = -ENOMEM;
3b69a9c5 220
65e8b0cc 221 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 222 hdr_len +
223 2 + /* capability info */
224 2 + /* AID */
225 2 + 8 + /* supported rates */
226 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
227 2 + sdata->u.mesh.mesh_id_len +
228 2 + sizeof(struct ieee80211_meshconf_ie) +
176f3608 229 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 230 2 + sizeof(struct ieee80211_ht_operation) +
c85fb53c
BC		 231 2 + sizeof(struct ieee80211_vht_cap) +
232 2 + sizeof(struct ieee80211_vht_operation) +
3b69a9c5
TP		 233 2 + 8 + /* peering IE */
234 sdata->u.mesh.ie_len);
c3896d2c 235 if (!skb)
87d84c45 236 return err;
e7570dfb 237 info = IEEE80211_SKB_CB(skb);
65e8b0cc 238 skb_reserve(skb, local->tx_headroom);
3b69a9c5
TP		 239 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
240 memset(mgmt, 0, hdr_len);
e7827a70
HH		 241 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
242 IEEE80211_STYPE_ACTION);
c3896d2c 243 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 244 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 245 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 246 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
247 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 248
8db09850 249 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
55de908a
JB		 250 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
251
8db09850
TP		 252 /* capability info */
253 pos = skb_put(skb, 2);
254 memset(pos, 0, 2);
54ef656b 255 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 256 /* AID */
257 pos = skb_put(skb, 2);
a69bd8e6 258 put_unaligned_le16(sta->sta.aid, pos);
c3896d2c 259 }
55de908a
JB		 260 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
261 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 262 mesh_add_rsn_ie(sdata, skb) ||
263 mesh_add_meshid_ie(sdata, skb) ||
264 mesh_add_meshconf_ie(sdata, skb))
f609a43d 265 goto free;
8db09850 266 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 267 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 268 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 269 goto free;
c3896d2c
LCC		 270 }
271
8db09850 272 /* Add Mesh Peering Management element */
c3896d2c 273 switch (action) {
54ef656b 274 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 275 break;
54ef656b 276 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 277 ie_len += 2;
c3896d2c
LCC		 278 include_plid = true;
279 break;
54ef656b 280 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 281 if (plid) {
282 ie_len += 2;
c3896d2c
LCC		 283 include_plid = true;
284 }
8db09850 285 ie_len += 2; /* reason code */
c3896d2c 286 break;
8db09850 287 default:
f609a43d
TP		 288 err = -EINVAL;
289 goto free;
c3896d2c
LCC		 290 }
291
8db09850 292 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 293 goto free;
8db09850 294
c3896d2c 295 pos = skb_put(skb, 2 + ie_len);
8db09850 296 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 297 *pos++ = ie_len;
8db09850
TP		 298 memcpy(pos, &peering_proto, 2);
299 pos += 2;
6f101ef0 300 put_unaligned_le16(llid, pos);
8db09850 301 pos += 2;
c3896d2c 302 if (include_plid) {
6f101ef0 303 put_unaligned_le16(plid, pos);
8db09850 304 pos += 2;
c3896d2c 305 }
54ef656b 306 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 307 put_unaligned_le16(reason, pos);
8db09850 308 pos += 2;
c3896d2c 309 }
176f3608
TP		 310
311 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d 312 if (mesh_add_ht_cap_ie(sdata, skb) ||
c85fb53c
BC		 313 mesh_add_ht_oper_ie(sdata, skb) ||
314 mesh_add_vht_cap_ie(sdata, skb) ||
315 mesh_add_vht_oper_ie(sdata, skb))
f609a43d 316 goto free;
176f3608
TP		 317 }
318
bf7cd94d 319 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 320 goto free;
c3896d2c 321
62ae67be 322 ieee80211_tx_skb(sdata, skb);
c3896d2c 323 return 0;
f609a43d
TP		 324free:
325 kfree_skb(skb);
326 return err;
c3896d2c
LCC		 327}
328
fa87a656
BC		 329/**
330 * __mesh_plink_deactivate - deactivate mesh peer link
331 *
332 * @sta: mesh peer link to deactivate
333 *
334 * All mesh paths with this peer as next hop will be flushed
335 * Returns beacon changed flag if the beacon content changed.
336 *
337 * Locking: the caller must hold sta->mesh->plink_lock
338 */
339static u32 __mesh_plink_deactivate(struct sta_info *sta)
340{
341 struct ieee80211_sub_if_data *sdata = sta->sdata;
342 u32 changed = 0;
343
344 lockdep_assert_held(&sta->mesh->plink_lock);
345
346 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
347 changed = mesh_plink_dec_estab_count(sdata);
348 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
349 mesh_path_flush_by_nexthop(sta);
350
351 ieee80211_mps_sta_status_update(sta);
352 changed |= ieee80211_mps_set_sta_local_pm(sta,
353 NL80211_MESH_POWER_UNKNOWN);
354
355 return changed;
356}
357
358/**
359 * mesh_plink_deactivate - deactivate mesh peer link
360 *
361 * @sta: mesh peer link to deactivate
362 *
363 * All mesh paths with this peer as next hop will be flushed
364 */
365u32 mesh_plink_deactivate(struct sta_info *sta)
366{
367 struct ieee80211_sub_if_data *sdata = sta->sdata;
368 u32 changed;
369
370 spin_lock_bh(&sta->mesh->plink_lock);
371 changed = __mesh_plink_deactivate(sta);
372 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
a69bd8e6 373 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
fa87a656
BC		 374 sta->sta.addr, sta->mesh->llid, sta->mesh->plid,
375 sta->mesh->reason);
376 spin_unlock_bh(&sta->mesh->plink_lock);
377
378 return changed;
379}
380
296fcba3
TP		 381static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
382 struct sta_info *sta,
383 struct ieee802_11_elems *elems, bool insert)
c3896d2c 384{
f698d856 385 struct ieee80211_local *local = sdata->local;
55de908a 386 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
54ab1ffb 387 struct ieee80211_supported_band *sband;
f68d776a 388 u32 rates, basic_rates = 0, changed = 0;
abcff6ef 389 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
c3896d2c 390
f743ff49 391 sband = local->hw.wiphy->bands[band];
2103dec1 392 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
d0709a65 393
433f5bc1 394 spin_lock_bh(&sta->mesh->plink_lock);
e5a9f8d0 395 sta->rx_stats.last_rx = jiffies;
296fcba3
TP		 396
397 /* rates and capabilities don't change during peering */
433f5bc1
JB		 398 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
399 sta->mesh->processed_beacon)
296fcba3 400 goto out;
433f5bc1 401 sta->mesh->processed_beacon = true;
bae35d92 402
f68d776a
TP		 403 if (sta->sta.supp_rates[band] != rates)
404 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
f743ff49 405 sta->sta.supp_rates[band] = rates;
54ab1ffb 406
52ac8c48
TP		 407 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
408 elems->ht_cap_elem, sta))
409 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 410
c85fb53c
BC		 411 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
412 elems->vht_cap_elem, sta);
413
abcff6ef
JD		 414 if (bw != sta->sta.bandwidth)
415 changed |= IEEE80211_RC_BW_CHANGED;
416
52ac8c48
TP		 417 /* HT peer is operating 20MHz-only */
418 if (elems->ht_operation &&
419 !(elems->ht_operation->ht_param &
420 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
421 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 422 changed |= IEEE80211_RC_BW_CHANGED;
52ac8c48 423 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 424 }
c7d25828 425
59cf1d65
HS		 426 if (insert)
427 rate_control_rate_init(sta);
f68d776a
TP		 428 else
429 rate_control_rate_update(local, sband, sta, changed);
296fcba3 430out:
433f5bc1 431 spin_unlock_bh(&sta->mesh->plink_lock);
296fcba3
TP		 432}
433
0e0060fc
BC		 434static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
435{
436 struct sta_info *sta;
437 unsigned long *aid_map;
438 int aid;
439
440 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
441 sizeof(*aid_map), GFP_KERNEL);
442 if (!aid_map)
443 return -ENOMEM;
444
445 /* reserve aid 0 for mcast indication */
446 __set_bit(0, aid_map);
447
448 rcu_read_lock();
449 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
450 __set_bit(sta->sta.aid, aid_map);
451 rcu_read_unlock();
452
453 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
454 kfree(aid_map);
455
456 if (aid > IEEE80211_MAX_AID)
457 return -ENOBUFS;
458
459 return aid;
460}
461
296fcba3
TP		 462static struct sta_info *
463__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
464{
465 struct sta_info *sta;
0e0060fc 466 int aid;
54ab1ffb 467
296fcba3 468 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 469 return NULL;
470
0e0060fc
BC		 471 aid = mesh_allocate_aid(sdata);
472 if (aid < 0)
473 return NULL;
474
296fcba3
TP		 475 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
476 if (!sta)
477 return NULL;
478
433f5bc1 479 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 480 sta->sta.wme = true;
0e0060fc 481 sta->sta.aid = aid;
296fcba3
TP		 482
483 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
484 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
485 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
486
296fcba3
TP		 487 return sta;
488}
489
490static struct sta_info *
491mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
492 struct ieee802_11_elems *elems)
493{
494 struct sta_info *sta = NULL;
495
a6dad6a2
TP		 496 /* Userspace handles station allocation */
497 if (sdata->u.mesh.user_mpm ||
498 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
296fcba3
TP		 499 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
500 elems->ie_start,
501 elems->total_len,
502 GFP_KERNEL);
503 else
504 sta = __mesh_sta_info_alloc(sdata, addr);
505
54ab1ffb
TP		 506 return sta;
507}
508
296fcba3
TP		 509/*
510 * mesh_sta_info_get - return mesh sta info entry for @addr.
511 *
512 * @sdata: local meshif
513 * @addr: peer's address
514 * @elems: IEs from beacon or mesh peering frame.
515 *
516 * Return existing or newly allocated sta_info under RCU read lock.
517 * (re)initialize with given IEs.
518 */
519static struct sta_info *
520mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
521 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
522{
523 struct sta_info *sta = NULL;
524
525 rcu_read_lock();
526 sta = sta_info_get(sdata, addr);
527 if (sta) {
528 mesh_sta_info_init(sdata, sta, elems, false);
529 } else {
530 rcu_read_unlock();
531 /* can't run atomic */
532 sta = mesh_sta_info_alloc(sdata, addr, elems);
533 if (!sta) {
534 rcu_read_lock();
535 return NULL;
536 }
537
3b4797bc
TP		 538 mesh_sta_info_init(sdata, sta, elems, true);
539
296fcba3
TP		 540 if (sta_info_insert_rcu(sta))
541 return NULL;
542 }
543
544 return sta;
545}
546
547/*
548 * mesh_neighbour_update - update or initialize new mesh neighbor.
549 *
550 * @sdata: local meshif
551 * @addr: peer's address
552 * @elems: IEs from beacon or mesh peering frame
553 *
554 * Initiates peering if appropriate.
555 */
f743ff49
TP		 556void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
557 u8 *hw_addr,
54ab1ffb
TP		 558 struct ieee802_11_elems *elems)
559{
560 struct sta_info *sta;
39886b61 561 u32 changed = 0;
54ab1ffb 562
296fcba3 563 sta = mesh_sta_info_get(sdata, hw_addr, elems);
54ab1ffb
TP		 564 if (!sta)
565 goto out;
566
1570ca59 567 if (mesh_peer_accepts_plinks(elems) &&
433f5bc1 568 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
54ab1ffb
TP		 569 sdata->u.mesh.accepting_plinks &&
570 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 571 rssi_threshold_check(sdata, sta))
39886b61 572 changed = mesh_plink_open(sta);
c3896d2c 573
3f52b7e3 574 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 575out:
d0709a65 576 rcu_read_unlock();
2b5e1967 577 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 578}
579
580static void mesh_plink_timer(unsigned long data)
581{
582 struct sta_info *sta;
6f101ef0 583 u16 reason = 0;
c3896d2c 584 struct ieee80211_sub_if_data *sdata;
453e66f2 585 struct mesh_config *mshcfg;
4efec451 586 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 587
d0709a65
JB		 588 /*
589 * This STA is valid because sta_info_destroy() will
590 * del_timer_sync() this timer after having made sure
591 * it cannot be readded (by deleting the plink.)
592 */
c3896d2c
LCC		 593 sta = (struct sta_info *) data;
594
690205f1 595 if (sta->sdata->local->quiescing)
5bb644a0 596 return;
5bb644a0 597
433f5bc1 598 spin_lock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 599
600 /* If a timer fires just before a state transition on another CPU,
601 * we may have already extended the timeout and changed state by the
602 * time we've acquired the lock and arrived here. In that case,
603 * skip this timer and wait for the new one.
604 */
433f5bc1 605 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
2b470c39
BC		 606 mpl_dbg(sta->sdata,
607 "Ignoring timer for %pM in state %s (timer adjusted)",
433f5bc1
JB		 608 sta->sta.addr, mplstates[sta->mesh->plink_state]);
609 spin_unlock_bh(&sta->mesh->plink_lock);
c3896d2c
LCC		 610 return;
611 }
2b470c39
BC		 612
613 /* del_timer() and handler may race when entering these states */
433f5bc1
JB		 614 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
615 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
2b470c39
BC		 616 mpl_dbg(sta->sdata,
617 "Ignoring timer for %pM in state %s (timer deleted)",
433f5bc1
JB		 618 sta->sta.addr, mplstates[sta->mesh->plink_state]);
619 spin_unlock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 620 return;
621 }
622
bdcbd8e0 623 mpl_dbg(sta->sdata,
3088f7d2 624 "Mesh plink timer for %pM fired on state %s\n",
433f5bc1 625 sta->sta.addr, mplstates[sta->mesh->plink_state]);
d0709a65 626 sdata = sta->sdata;
453e66f2 627 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c 628
433f5bc1 629 switch (sta->mesh->plink_state) {
57cf8043
JC		 630 case NL80211_PLINK_OPN_RCVD:
631 case NL80211_PLINK_OPN_SNT:
c3896d2c 632 /* retry timer */
433f5bc1 633 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 634 u32 rand;
bdcbd8e0
JB		 635 mpl_dbg(sta->sdata,
636 "Mesh plink for %pM (retry, timeout): %d %d\n",
433f5bc1
JB		 637 sta->sta.addr, sta->mesh->plink_retries,
638 sta->mesh->plink_timeout);
c3896d2c 639 get_random_bytes(&rand, sizeof(u32));
433f5bc1
JB		 640 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
641 rand % sta->mesh->plink_timeout;
642 ++sta->mesh->plink_retries;
643 mod_plink_timer(sta, sta->mesh->plink_timeout);
4efec451 644 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 645 break;
646 }
6f101ef0 647 reason = WLAN_REASON_MESH_MAX_RETRIES;
c3896d2c 648 /* fall through on else */
57cf8043 649 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 650 /* confirm timer */
651 if (!reason)
6f101ef0 652 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
433f5bc1 653 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
453e66f2 654 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 655 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 656 break;
57cf8043 657 case NL80211_PLINK_HOLDING:
c3896d2c 658 /* holding timer */
433f5bc1 659 del_timer(&sta->mesh->plink_timer);
c3896d2c 660 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 661 break;
662 default:
c3896d2c
LCC		 663 break;
664 }
433f5bc1 665 spin_unlock_bh(&sta->mesh->plink_lock);
4efec451 666 if (action)
a69bd8e6 667 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1 668 sta->mesh->llid, sta->mesh->plid, reason);
c3896d2c
LCC		 669}
670
0df2f6c1 671static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 672{
433f5bc1
JB		 673 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
674 sta->mesh->plink_timer.data = (unsigned long) sta;
675 sta->mesh->plink_timer.function = mesh_plink_timer;
676 sta->mesh->plink_timeout = timeout;
677 add_timer(&sta->mesh->plink_timer);
c3896d2c
LCC		 678}
679
204d1304 680static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 681 u16 llid)
204d1304
TP		 682{
683 struct ieee80211_local *local = sdata->local;
684 bool in_use = false;
685 struct sta_info *sta;
686
687 rcu_read_lock();
688 list_for_each_entry_rcu(sta, &local->sta_list, list) {
520c75dc
MS		 689 if (sdata != sta->sdata)
690 continue;
691
433f5bc1 692 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
204d1304
TP		 693 in_use = true;
694 break;
695 }
696 }
697 rcu_read_unlock();
698
699 return in_use;
700}
701
6f101ef0 702static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 703{
704 u16 llid;
705
706 do {
707 get_random_bytes(&llid, sizeof(llid));
6f101ef0 708 } while (llid_in_use(sdata, llid));
204d1304 709
6f101ef0 710 return llid;
204d1304
TP		 711}
712
39886b61 713u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 714{
d0709a65 715 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 716 u32 changed;
c3896d2c 717
c2c98fde 718 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 719 return 0;
53e80511 720
433f5bc1
JB		 721 spin_lock_bh(&sta->mesh->plink_lock);
722 sta->mesh->llid = mesh_get_new_llid(sdata);
723 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
724 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
725 spin_unlock_bh(&sta->mesh->plink_lock);
39886b61 726 return 0;
c3896d2c 727 }
433f5bc1 728 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 729 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
433f5bc1 730 spin_unlock_bh(&sta->mesh->plink_lock);
bdcbd8e0
JB		 731 mpl_dbg(sdata,
732 "Mesh plink: starting establishment with %pM\n",
0c68ae26 733 sta->sta.addr);
c3896d2c 734
3f52b7e3 735 /* set the non-peer mode to active during peering */
39886b61 736 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 737
a69bd8e6 738 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
433f5bc1 739 sta->sta.addr, sta->mesh->llid, 0, 0);
39886b61 740 return changed;
c3896d2c
LCC		 741}
742
39886b61 743u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 744{
df323818 745 u32 changed;
c9370197 746
433f5bc1 747 spin_lock_bh(&sta->mesh->plink_lock);
df323818 748 changed = __mesh_plink_deactivate(sta);
433f5bc1
JB		 749 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
750 spin_unlock_bh(&sta->mesh->plink_lock);
c9370197 751
39886b61 752 return changed;
c3896d2c
LCC		 753}
754
e76d67f0
BC		 755static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
756 struct sta_info *sta,
757 enum plink_event event)
758{
759 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
6f101ef0
CYY		 760 u16 reason = (event == CLS_ACPT) ?
761 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0 762
433f5bc1
JB		 763 sta->mesh->reason = reason;
764 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
272a9e26 765 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 766}
767
768static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
769 struct sta_info *sta)
770{
771 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
772 u32 changed = 0;
773
433f5bc1
JB		 774 del_timer(&sta->mesh->plink_timer);
775 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
e76d67f0
BC		 776 changed |= mesh_plink_inc_estab_count(sdata);
777 changed |= mesh_set_ht_prot_mode(sdata);
778 changed |= mesh_set_short_slot_time(sdata);
779 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
780 ieee80211_mps_sta_status_update(sta);
781 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
782 return changed;
783}
784
c7e67811
TP		 785/**
786 * mesh_plink_fsm - step @sta MPM based on @event
787 *
788 * @sdata: interface
789 * @sta: mesh neighbor
790 * @event: peering event
791 *
792 * Return: changed MBSS flags
793 */
794static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
795 struct sta_info *sta, enum plink_event event)
796{
797 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
798 enum ieee80211_self_protected_actioncode action = 0;
799 u32 changed = 0;
800
801 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
433f5bc1 802 mplstates[sta->mesh->plink_state], mplevents[event]);
c7e67811 803
433f5bc1
JB		 804 spin_lock_bh(&sta->mesh->plink_lock);
805 switch (sta->mesh->plink_state) {
c7e67811
TP		 806 case NL80211_PLINK_LISTEN:
807 switch (event) {
808 case CLS_ACPT:
809 mesh_plink_fsm_restart(sta);
810 break;
811 case OPN_ACPT:
433f5bc1
JB		 812 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
813 sta->mesh->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 814 mesh_plink_timer_set(sta,
815 mshcfg->dot11MeshRetryTimeout);
816
817 /* set the non-peer mode to active during peering */
818 changed |= ieee80211_mps_local_status_update(sdata);
819 action = WLAN_SP_MESH_PEERING_OPEN;
820 break;
821 default:
822 break;
823 }
824 break;
825 case NL80211_PLINK_OPN_SNT:
826 switch (event) {
827 case OPN_RJCT:
828 case CNF_RJCT:
829 case CLS_ACPT:
830 mesh_plink_close(sdata, sta, event);
831 action = WLAN_SP_MESH_PEERING_CLOSE;
832 break;
833 case OPN_ACPT:
834 /* retry timer is left untouched */
433f5bc1 835 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
c7e67811
TP		 836 action = WLAN_SP_MESH_PEERING_CONFIRM;
837 break;
838 case CNF_ACPT:
433f5bc1 839 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 840 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 841 break;
842 default:
843 break;
844 }
845 break;
846 case NL80211_PLINK_OPN_RCVD:
847 switch (event) {
848 case OPN_RJCT:
849 case CNF_RJCT:
850 case CLS_ACPT:
851 mesh_plink_close(sdata, sta, event);
852 action = WLAN_SP_MESH_PEERING_CLOSE;
853 break;
854 case OPN_ACPT:
855 action = WLAN_SP_MESH_PEERING_CONFIRM;
856 break;
857 case CNF_ACPT:
858 changed |= mesh_plink_establish(sdata, sta);
859 break;
860 default:
861 break;
862 }
863 break;
864 case NL80211_PLINK_CNF_RCVD:
865 switch (event) {
866 case OPN_RJCT:
867 case CNF_RJCT:
868 case CLS_ACPT:
869 mesh_plink_close(sdata, sta, event);
870 action = WLAN_SP_MESH_PEERING_CLOSE;
871 break;
872 case OPN_ACPT:
873 changed |= mesh_plink_establish(sdata, sta);
874 action = WLAN_SP_MESH_PEERING_CONFIRM;
875 break;
876 default:
877 break;
878 }
879 break;
880 case NL80211_PLINK_ESTAB:
881 switch (event) {
882 case CLS_ACPT:
883 changed |= __mesh_plink_deactivate(sta);
884 changed |= mesh_set_ht_prot_mode(sdata);
885 changed |= mesh_set_short_slot_time(sdata);
886 mesh_plink_close(sdata, sta, event);
887 action = WLAN_SP_MESH_PEERING_CLOSE;
888 break;
889 case OPN_ACPT:
890 action = WLAN_SP_MESH_PEERING_CONFIRM;
891 break;
892 default:
893 break;
894 }
895 break;
896 case NL80211_PLINK_HOLDING:
897 switch (event) {
898 case CLS_ACPT:
433f5bc1 899 del_timer(&sta->mesh->plink_timer);
c7e67811
TP		 900 mesh_plink_fsm_restart(sta);
901 break;
902 case OPN_ACPT:
903 case CNF_ACPT:
904 case OPN_RJCT:
905 case CNF_RJCT:
906 action = WLAN_SP_MESH_PEERING_CLOSE;
907 break;
908 default:
909 break;
910 }
911 break;
912 default:
913 /* should not get here, PLINK_BLOCKED is dealt with at the
914 * beginning of the function
915 */
916 break;
917 }
433f5bc1 918 spin_unlock_bh(&sta->mesh->plink_lock);
c7e67811 919 if (action) {
a69bd8e6 920 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1
JB		 921 sta->mesh->llid, sta->mesh->plid,
922 sta->mesh->reason);
c7e67811
TP		 923
924 /* also send confirm in open case */
925 if (action == WLAN_SP_MESH_PEERING_OPEN) {
a69bd8e6 926 mesh_plink_frame_tx(sdata, sta,
c7e67811 927 WLAN_SP_MESH_PEERING_CONFIRM,
433f5bc1
JB		 928 sta->sta.addr, sta->mesh->llid,
929 sta->mesh->plid, 0);
c7e67811
TP		 930 }
931 }
932
933 return changed;
934}
935
c99a89ed
TP		 936/*
937 * mesh_plink_get_event - get correct MPM event
938 *
939 * @sdata: interface
940 * @sta: peer, leave NULL if processing a frame from a new suitable peer
941 * @elems: peering management IEs
942 * @ftype: frame type
943 * @llid: peer's peer link ID
944 * @plid: peer's local link ID
945 *
946 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
947 * an error.
948 */
949static enum plink_event
950mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
951 struct sta_info *sta,
952 struct ieee802_11_elems *elems,
953 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 954 u16 llid, u16 plid)
c99a89ed
TP		 955{
956 enum plink_event event = PLINK_UNDEFINED;
957 u8 ie_len = elems->peering_len;
958 bool matches_local;
959
960 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
961 mesh_matches_local(sdata, elems));
962
963 /* deny open request from non-matching peer */
964 if (!matches_local && !sta) {
965 event = OPN_RJCT;
966 goto out;
967 }
968
969 if (!sta) {
970 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
971 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
972 goto out;
973 }
974 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
975 if (!mesh_plink_free_count(sdata)) {
976 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
977 goto out;
978 }
b8631c00
SS		 979
980 /* new matching peer */
981 event = OPN_ACPT;
982 goto out;
c99a89ed
TP		 983 } else {
984 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
985 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
986 goto out;
987 }
433f5bc1 988 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
c99a89ed
TP		 989 goto out;
990 }
991
c99a89ed
TP		 992 switch (ftype) {
993 case WLAN_SP_MESH_PEERING_OPEN:
994 if (!matches_local)
995 event = OPN_RJCT;
996 if (!mesh_plink_free_count(sdata) ||
433f5bc1 997 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 998 event = OPN_IGNR;
999 else
1000 event = OPN_ACPT;
1001 break;
1002 case WLAN_SP_MESH_PEERING_CONFIRM:
1003 if (!matches_local)
1004 event = CNF_RJCT;
1005 if (!mesh_plink_free_count(sdata) ||
433f5bc1
JB		 1006 sta->mesh->llid != llid ||
1007 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1008 event = CNF_IGNR;
1009 else
1010 event = CNF_ACPT;
1011 break;
1012 case WLAN_SP_MESH_PEERING_CLOSE:
433f5bc1 1013 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
c99a89ed
TP		 1014 /* Do not check for llid or plid. This does not
1015 * follow the standard but since multiple plinks
1016 * per sta are not supported, it is necessary in
1017 * order to avoid a livelock when MP A sees an
1018 * establish peer link to MP B but MP B does not
1019 * see it. This can be caused by a timeout in
1020 * B's peer link establishment or B beign
1021 * restarted.
1022 */
1023 event = CLS_ACPT;
433f5bc1 1024 else if (sta->mesh->plid != plid)
c99a89ed 1025 event = CLS_IGNR;
433f5bc1 1026 else if (ie_len == 8 && sta->mesh->llid != llid)
c99a89ed
TP		 1027 event = CLS_IGNR;
1028 else
1029 event = CLS_ACPT;
1030 break;
1031 default:
1032 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1033 break;
1034 }
1035
1036out:
1037 return event;
1038}
1039
05a23ae9
TP		 1040static void
1041mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1042 struct ieee80211_mgmt *mgmt,
1043 struct ieee802_11_elems *elems)
c3896d2c 1044{
05a23ae9 1045
c3896d2c
LCC		 1046 struct sta_info *sta;
1047 enum plink_event event;
54ef656b 1048 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 1049 u32 changed = 0;
c99a89ed 1050 u8 ie_len = elems->peering_len;
6f101ef0 1051 u16 plid, llid = 0;
c3896d2c 1052
05a23ae9 1053 if (!elems->peering) {
bdcbd8e0
JB		 1054 mpl_dbg(sdata,
1055 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1056 return;
1057 }
bf7cd94d 1058
05a23ae9 1059 if (elems->rsn_len &&
bf7cd94d 1060 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1061 mpl_dbg(sdata,
1062 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1063 return;
1064 }
c3896d2c 1065
8db09850 1066 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1067 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1068 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1069 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1070 && ie_len != 8)) {
bdcbd8e0
JB		 1071 mpl_dbg(sdata,
1072 "Mesh plink: incorrect plink ie length %d %d\n",
1073 ftype, ie_len);
c3896d2c
LCC		 1074 return;
1075 }
1076
54ef656b 1077 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1078 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1079 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1080 return;
1081 }
1082 /* Note the lines below are correct, the llid in the frame is the plid
1083 * from the point of view of this host.
1084 */
f8134fed 1085 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1086 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1087 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1088 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1089
296fcba3 1090 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1091 rcu_read_lock();
1092
abe60632 1093 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1094
55335137 1095 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1096 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1097 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1098 mgmt->sa);
fc10302e 1099 goto unlock_rcu;
55335137
AN		 1100 }
1101
c3896d2c 1102 /* Now we will figure out the appropriate event... */
c99a89ed 1103 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1104
1105 if (event == OPN_ACPT) {
296fcba3 1106 rcu_read_unlock();
54ab1ffb 1107 /* allocate sta entry if necessary and update info */
05a23ae9 1108 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
54ab1ffb 1109 if (!sta) {
bdcbd8e0 1110 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1111 goto unlock_rcu;
54ab1ffb 1112 }
433f5bc1 1113 sta->mesh->plid = plid;
c99a89ed 1114 } else if (!sta && event == OPN_RJCT) {
a69bd8e6 1115 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
c99a89ed 1116 mgmt->sa, 0, plid,
6f101ef0 1117 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1118 goto unlock_rcu;
1119 } else if (!sta || event == PLINK_UNDEFINED) {
1120 /* something went wrong */
1121 goto unlock_rcu;
c3896d2c
LCC		 1122 }
1123
a69bd8e6
BC		 1124 if (event == CNF_ACPT) {
1125 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
0e0060fc 1126 if (!sta->mesh->plid)
a69bd8e6 1127 sta->mesh->plid = plid;
a69bd8e6
BC		 1128
1129 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1130 }
6c6fa496 1131
c7e67811 1132 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1133
fc10302e 1134unlock_rcu:
d0709a65 1135 rcu_read_unlock();
57aac7c5 1136
ecccd072 1137 if (changed)
2b5e1967 1138 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1139}
05a23ae9
TP		 1140
1141void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1142 struct ieee80211_mgmt *mgmt, size_t len,
1143 struct ieee80211_rx_status *rx_status)
1144{
1145 struct ieee802_11_elems elems;
1146 size_t baselen;
1147 u8 *baseaddr;
1148
1149 /* need action_code, aux */
1150 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1151 return;
1152
1153 if (sdata->u.mesh.user_mpm)
1154 /* userspace must register for these */
1155 return;
1156
1157 if (is_multicast_ether_addr(mgmt->da)) {
1158 mpl_dbg(sdata,
1159 "Mesh plink: ignore frame from multicast address\n");
1160 return;
1161 }
1162
1163 baseaddr = mgmt->u.action.u.self_prot.variable;
1164 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1165 if (mgmt->u.action.u.self_prot.action_code ==
1166 WLAN_SP_MESH_PEERING_CONFIRM) {
1167 baseaddr += 4;
1168 baselen += 4;
b3e7de87
BC		 1169
1170 if (baselen > len)
1171 return;
05a23ae9
TP		 1172 }
1173 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1174 mesh_process_plink_frame(sdata, mgmt, &elems);
1175}
Linux 6.x block layer and io_uring tree(s)