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ASoC: rsnd: move priv member settings to upper side
[deliverable/linux.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, \
20 jiffies + HZ * t / 1000))
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;
296fcba3
TP		 434
435 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
436 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
437 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
438
439 set_sta_flag(sta, WLAN_STA_WME);
6b5895d9 440 sta->sta.wme = true;
296fcba3
TP		 441
442 return sta;
443}
444
445static struct sta_info *
446mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
447 struct ieee802_11_elems *elems)
448{
449 struct sta_info *sta = NULL;
450
a6dad6a2
TP		 451 /* Userspace handles station allocation */
452 if (sdata->u.mesh.user_mpm ||
453 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
296fcba3
TP		 454 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
455 elems->ie_start,
456 elems->total_len,
457 GFP_KERNEL);
458 else
459 sta = __mesh_sta_info_alloc(sdata, addr);
460
54ab1ffb
TP		 461 return sta;
462}
463
296fcba3
TP		 464/*
465 * mesh_sta_info_get - return mesh sta info entry for @addr.
466 *
467 * @sdata: local meshif
468 * @addr: peer's address
469 * @elems: IEs from beacon or mesh peering frame.
470 *
471 * Return existing or newly allocated sta_info under RCU read lock.
472 * (re)initialize with given IEs.
473 */
474static struct sta_info *
475mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
476 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
477{
478 struct sta_info *sta = NULL;
479
480 rcu_read_lock();
481 sta = sta_info_get(sdata, addr);
482 if (sta) {
483 mesh_sta_info_init(sdata, sta, elems, false);
484 } else {
485 rcu_read_unlock();
486 /* can't run atomic */
487 sta = mesh_sta_info_alloc(sdata, addr, elems);
488 if (!sta) {
489 rcu_read_lock();
490 return NULL;
491 }
492
3b4797bc
TP		 493 mesh_sta_info_init(sdata, sta, elems, true);
494
296fcba3
TP		 495 if (sta_info_insert_rcu(sta))
496 return NULL;
497 }
498
499 return sta;
500}
501
502/*
503 * mesh_neighbour_update - update or initialize new mesh neighbor.
504 *
505 * @sdata: local meshif
506 * @addr: peer's address
507 * @elems: IEs from beacon or mesh peering frame
508 *
509 * Initiates peering if appropriate.
510 */
f743ff49
TP		 511void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
512 u8 *hw_addr,
54ab1ffb
TP		 513 struct ieee802_11_elems *elems)
514{
515 struct sta_info *sta;
39886b61 516 u32 changed = 0;
54ab1ffb 517
296fcba3 518 sta = mesh_sta_info_get(sdata, hw_addr, elems);
54ab1ffb
TP		 519 if (!sta)
520 goto out;
521
1570ca59 522 if (mesh_peer_accepts_plinks(elems) &&
54ab1ffb
TP		 523 sta->plink_state == NL80211_PLINK_LISTEN &&
524 sdata->u.mesh.accepting_plinks &&
525 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 526 rssi_threshold_check(sdata, sta))
39886b61 527 changed = mesh_plink_open(sta);
c3896d2c 528
3f52b7e3 529 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 530out:
d0709a65 531 rcu_read_unlock();
2b5e1967 532 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 533}
534
535static void mesh_plink_timer(unsigned long data)
536{
537 struct sta_info *sta;
6f101ef0 538 u16 reason = 0;
c3896d2c 539 struct ieee80211_sub_if_data *sdata;
453e66f2 540 struct mesh_config *mshcfg;
4efec451 541 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 542
d0709a65
JB		 543 /*
544 * This STA is valid because sta_info_destroy() will
545 * del_timer_sync() this timer after having made sure
546 * it cannot be readded (by deleting the plink.)
547 */
c3896d2c
LCC		 548 sta = (struct sta_info *) data;
549
690205f1 550 if (sta->sdata->local->quiescing)
5bb644a0 551 return;
5bb644a0 552
07346f81 553 spin_lock_bh(&sta->lock);
c3896d2c
LCC		 554 if (sta->ignore_plink_timer) {
555 sta->ignore_plink_timer = false;
07346f81 556 spin_unlock_bh(&sta->lock);
c3896d2c
LCC		 557 return;
558 }
bdcbd8e0 559 mpl_dbg(sta->sdata,
3088f7d2
TP		 560 "Mesh plink timer for %pM fired on state %s\n",
561 sta->sta.addr, mplstates[sta->plink_state]);
d0709a65 562 sdata = sta->sdata;
453e66f2 563 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c
LCC		 564
565 switch (sta->plink_state) {
57cf8043
JC		 566 case NL80211_PLINK_OPN_RCVD:
567 case NL80211_PLINK_OPN_SNT:
c3896d2c 568 /* retry timer */
453e66f2 569 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 570 u32 rand;
bdcbd8e0
JB		 571 mpl_dbg(sta->sdata,
572 "Mesh plink for %pM (retry, timeout): %d %d\n",
0c68ae26
JB		 573 sta->sta.addr, sta->plink_retries,
574 sta->plink_timeout);
c3896d2c
LCC		 575 get_random_bytes(&rand, sizeof(u32));
576 sta->plink_timeout = sta->plink_timeout +
577 rand % sta->plink_timeout;
578 ++sta->plink_retries;
d0709a65 579 mod_plink_timer(sta, sta->plink_timeout);
4efec451 580 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 581 break;
582 }
6f101ef0 583 reason = WLAN_REASON_MESH_MAX_RETRIES;
c3896d2c 584 /* fall through on else */
57cf8043 585 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 586 /* confirm timer */
587 if (!reason)
6f101ef0 588 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
57cf8043 589 sta->plink_state = NL80211_PLINK_HOLDING;
453e66f2 590 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 591 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 592 break;
57cf8043 593 case NL80211_PLINK_HOLDING:
c3896d2c 594 /* holding timer */
d0709a65 595 del_timer(&sta->plink_timer);
c3896d2c 596 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 597 break;
598 default:
c3896d2c
LCC		 599 break;
600 }
0f5ffd24 601 spin_unlock_bh(&sta->lock);
4efec451
TP		 602 if (action)
603 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
6f101ef0 604 sta->llid, sta->plid, reason);
c3896d2c
LCC		 605}
606
607static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
608{
609 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
610 sta->plink_timer.data = (unsigned long) sta;
611 sta->plink_timer.function = mesh_plink_timer;
612 sta->plink_timeout = timeout;
c3896d2c
LCC		 613 add_timer(&sta->plink_timer);
614}
615
204d1304 616static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 617 u16 llid)
204d1304
TP		 618{
619 struct ieee80211_local *local = sdata->local;
620 bool in_use = false;
621 struct sta_info *sta;
622
623 rcu_read_lock();
624 list_for_each_entry_rcu(sta, &local->sta_list, list) {
625 if (!memcmp(&sta->llid, &llid, sizeof(llid))) {
626 in_use = true;
627 break;
628 }
629 }
630 rcu_read_unlock();
631
632 return in_use;
633}
634
6f101ef0 635static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 636{
637 u16 llid;
638
639 do {
640 get_random_bytes(&llid, sizeof(llid));
641 /* for mesh PS we still only have the AID range for TIM bits */
642 llid = (llid % IEEE80211_MAX_AID) + 1;
6f101ef0 643 } while (llid_in_use(sdata, llid));
204d1304 644
6f101ef0 645 return llid;
204d1304
TP		 646}
647
39886b61 648u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 649{
d0709a65 650 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 651 u32 changed;
c3896d2c 652
c2c98fde 653 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 654 return 0;
53e80511 655
07346f81 656 spin_lock_bh(&sta->lock);
204d1304 657 sta->llid = mesh_get_new_llid(sdata);
9385d04f
CYY		 658 if (sta->plink_state != NL80211_PLINK_LISTEN &&
659 sta->plink_state != NL80211_PLINK_BLOCKED) {
07346f81 660 spin_unlock_bh(&sta->lock);
39886b61 661 return 0;
c3896d2c 662 }
57cf8043 663 sta->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 664 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
07346f81 665 spin_unlock_bh(&sta->lock);
bdcbd8e0
JB		 666 mpl_dbg(sdata,
667 "Mesh plink: starting establishment with %pM\n",
0c68ae26 668 sta->sta.addr);
c3896d2c 669
3f52b7e3 670 /* set the non-peer mode to active during peering */
39886b61 671 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 672
39886b61 673 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
204d1304 674 sta->sta.addr, sta->llid, 0, 0);
39886b61 675 return changed;
c3896d2c
LCC		 676}
677
39886b61 678u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 679{
df323818 680 u32 changed;
c9370197 681
07346f81 682 spin_lock_bh(&sta->lock);
df323818 683 changed = __mesh_plink_deactivate(sta);
57cf8043 684 sta->plink_state = NL80211_PLINK_BLOCKED;
07346f81 685 spin_unlock_bh(&sta->lock);
c9370197 686
39886b61 687 return changed;
c3896d2c
LCC		 688}
689
e76d67f0
BC		 690static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
691 struct sta_info *sta,
692 enum plink_event event)
693{
694 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
695
6f101ef0
CYY		 696 u16 reason = (event == CLS_ACPT) ?
697 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0
BC		 698
699 sta->reason = reason;
700 sta->plink_state = NL80211_PLINK_HOLDING;
272a9e26 701 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 702}
703
704static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
705 struct sta_info *sta)
706{
707 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
708 u32 changed = 0;
709
710 del_timer(&sta->plink_timer);
711 sta->plink_state = NL80211_PLINK_ESTAB;
712 changed |= mesh_plink_inc_estab_count(sdata);
713 changed |= mesh_set_ht_prot_mode(sdata);
714 changed |= mesh_set_short_slot_time(sdata);
715 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
716 ieee80211_mps_sta_status_update(sta);
717 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
718 return changed;
719}
720
c7e67811
TP		 721/**
722 * mesh_plink_fsm - step @sta MPM based on @event
723 *
724 * @sdata: interface
725 * @sta: mesh neighbor
726 * @event: peering event
727 *
728 * Return: changed MBSS flags
729 */
730static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
731 struct sta_info *sta, enum plink_event event)
732{
733 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
734 enum ieee80211_self_protected_actioncode action = 0;
735 u32 changed = 0;
736
737 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
738 mplstates[sta->plink_state], mplevents[event]);
739
740 spin_lock_bh(&sta->lock);
741 switch (sta->plink_state) {
742 case NL80211_PLINK_LISTEN:
743 switch (event) {
744 case CLS_ACPT:
745 mesh_plink_fsm_restart(sta);
746 break;
747 case OPN_ACPT:
748 sta->plink_state = NL80211_PLINK_OPN_RCVD;
204d1304 749 sta->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 750 mesh_plink_timer_set(sta,
751 mshcfg->dot11MeshRetryTimeout);
752
753 /* set the non-peer mode to active during peering */
754 changed |= ieee80211_mps_local_status_update(sdata);
755 action = WLAN_SP_MESH_PEERING_OPEN;
756 break;
757 default:
758 break;
759 }
760 break;
761 case NL80211_PLINK_OPN_SNT:
762 switch (event) {
763 case OPN_RJCT:
764 case CNF_RJCT:
765 case CLS_ACPT:
766 mesh_plink_close(sdata, sta, event);
767 action = WLAN_SP_MESH_PEERING_CLOSE;
768 break;
769 case OPN_ACPT:
770 /* retry timer is left untouched */
771 sta->plink_state = NL80211_PLINK_OPN_RCVD;
772 action = WLAN_SP_MESH_PEERING_CONFIRM;
773 break;
774 case CNF_ACPT:
775 sta->plink_state = NL80211_PLINK_CNF_RCVD;
776 if (!mod_plink_timer(sta,
777 mshcfg->dot11MeshConfirmTimeout))
778 sta->ignore_plink_timer = true;
779 break;
780 default:
781 break;
782 }
783 break;
784 case NL80211_PLINK_OPN_RCVD:
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 action = WLAN_SP_MESH_PEERING_CONFIRM;
794 break;
795 case CNF_ACPT:
796 changed |= mesh_plink_establish(sdata, sta);
797 break;
798 default:
799 break;
800 }
801 break;
802 case NL80211_PLINK_CNF_RCVD:
803 switch (event) {
804 case OPN_RJCT:
805 case CNF_RJCT:
806 case CLS_ACPT:
807 mesh_plink_close(sdata, sta, event);
808 action = WLAN_SP_MESH_PEERING_CLOSE;
809 break;
810 case OPN_ACPT:
811 changed |= mesh_plink_establish(sdata, sta);
812 action = WLAN_SP_MESH_PEERING_CONFIRM;
813 break;
814 default:
815 break;
816 }
817 break;
818 case NL80211_PLINK_ESTAB:
819 switch (event) {
820 case CLS_ACPT:
821 changed |= __mesh_plink_deactivate(sta);
822 changed |= mesh_set_ht_prot_mode(sdata);
823 changed |= mesh_set_short_slot_time(sdata);
824 mesh_plink_close(sdata, sta, event);
825 action = WLAN_SP_MESH_PEERING_CLOSE;
826 break;
827 case OPN_ACPT:
828 action = WLAN_SP_MESH_PEERING_CONFIRM;
829 break;
830 default:
831 break;
832 }
833 break;
834 case NL80211_PLINK_HOLDING:
835 switch (event) {
836 case CLS_ACPT:
837 if (del_timer(&sta->plink_timer))
838 sta->ignore_plink_timer = 1;
839 mesh_plink_fsm_restart(sta);
840 break;
841 case OPN_ACPT:
842 case CNF_ACPT:
843 case OPN_RJCT:
844 case CNF_RJCT:
845 action = WLAN_SP_MESH_PEERING_CLOSE;
846 break;
847 default:
848 break;
849 }
850 break;
851 default:
852 /* should not get here, PLINK_BLOCKED is dealt with at the
853 * beginning of the function
854 */
855 break;
856 }
857 spin_unlock_bh(&sta->lock);
858 if (action) {
859 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
860 sta->llid, sta->plid, sta->reason);
861
862 /* also send confirm in open case */
863 if (action == WLAN_SP_MESH_PEERING_OPEN) {
864 mesh_plink_frame_tx(sdata,
865 WLAN_SP_MESH_PEERING_CONFIRM,
866 sta->sta.addr, sta->llid,
867 sta->plid, 0);
868 }
869 }
870
871 return changed;
872}
873
c99a89ed
TP		 874/*
875 * mesh_plink_get_event - get correct MPM event
876 *
877 * @sdata: interface
878 * @sta: peer, leave NULL if processing a frame from a new suitable peer
879 * @elems: peering management IEs
880 * @ftype: frame type
881 * @llid: peer's peer link ID
882 * @plid: peer's local link ID
883 *
884 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
885 * an error.
886 */
887static enum plink_event
888mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
889 struct sta_info *sta,
890 struct ieee802_11_elems *elems,
891 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 892 u16 llid, u16 plid)
c99a89ed
TP		 893{
894 enum plink_event event = PLINK_UNDEFINED;
895 u8 ie_len = elems->peering_len;
896 bool matches_local;
897
898 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
899 mesh_matches_local(sdata, elems));
900
901 /* deny open request from non-matching peer */
902 if (!matches_local && !sta) {
903 event = OPN_RJCT;
904 goto out;
905 }
906
907 if (!sta) {
908 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
909 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
910 goto out;
911 }
912 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
913 if (!mesh_plink_free_count(sdata)) {
914 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
915 goto out;
916 }
917 } else {
918 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
919 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
920 goto out;
921 }
922 if (sta->plink_state == NL80211_PLINK_BLOCKED)
923 goto out;
924 }
925
926 /* new matching peer */
927 if (!sta) {
928 event = OPN_ACPT;
929 goto out;
930 }
931
932 switch (ftype) {
933 case WLAN_SP_MESH_PEERING_OPEN:
934 if (!matches_local)
935 event = OPN_RJCT;
936 if (!mesh_plink_free_count(sdata) ||
937 (sta->plid && sta->plid != plid))
938 event = OPN_IGNR;
939 else
940 event = OPN_ACPT;
941 break;
942 case WLAN_SP_MESH_PEERING_CONFIRM:
943 if (!matches_local)
944 event = CNF_RJCT;
945 if (!mesh_plink_free_count(sdata) ||
946 (sta->llid != llid || sta->plid != plid))
947 event = CNF_IGNR;
948 else
949 event = CNF_ACPT;
950 break;
951 case WLAN_SP_MESH_PEERING_CLOSE:
952 if (sta->plink_state == NL80211_PLINK_ESTAB)
953 /* Do not check for llid or plid. This does not
954 * follow the standard but since multiple plinks
955 * per sta are not supported, it is necessary in
956 * order to avoid a livelock when MP A sees an
957 * establish peer link to MP B but MP B does not
958 * see it. This can be caused by a timeout in
959 * B's peer link establishment or B beign
960 * restarted.
961 */
962 event = CLS_ACPT;
963 else if (sta->plid != plid)
964 event = CLS_IGNR;
965 else if (ie_len == 8 && sta->llid != llid)
966 event = CLS_IGNR;
967 else
968 event = CLS_ACPT;
969 break;
970 default:
971 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
972 break;
973 }
974
975out:
976 return event;
977}
978
05a23ae9
TP		 979static void
980mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
981 struct ieee80211_mgmt *mgmt,
982 struct ieee802_11_elems *elems)
c3896d2c 983{
05a23ae9 984
c3896d2c
LCC		 985 struct sta_info *sta;
986 enum plink_event event;
54ef656b 987 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 988 u32 changed = 0;
c99a89ed 989 u8 ie_len = elems->peering_len;
6f101ef0
CYY		 990 __le16 _plid, _llid;
991 u16 plid, llid = 0;
c3896d2c 992
05a23ae9 993 if (!elems->peering) {
bdcbd8e0
JB		 994 mpl_dbg(sdata,
995 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 996 return;
997 }
bf7cd94d 998
05a23ae9 999 if (elems->rsn_len &&
bf7cd94d 1000 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1001 mpl_dbg(sdata,
1002 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1003 return;
1004 }
c3896d2c 1005
8db09850 1006 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1007 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1008 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1009 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1010 && ie_len != 8)) {
bdcbd8e0
JB		 1011 mpl_dbg(sdata,
1012 "Mesh plink: incorrect plink ie length %d %d\n",
1013 ftype, ie_len);
c3896d2c
LCC		 1014 return;
1015 }
1016
54ef656b 1017 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1018 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1019 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1020 return;
1021 }
1022 /* Note the lines below are correct, the llid in the frame is the plid
1023 * from the point of view of this host.
1024 */
6f101ef0
CYY		 1025 memcpy(&_plid, PLINK_GET_LLID(elems->peering), sizeof(__le16));
1026 plid = le16_to_cpu(_plid);
54ef656b 1027 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
6f101ef0
CYY		 1028 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) {
1029 memcpy(&_llid, PLINK_GET_PLID(elems->peering), sizeof(__le16));
1030 llid = le16_to_cpu(_llid);
1031 }
c3896d2c 1032
296fcba3 1033 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1034 rcu_read_lock();
1035
abe60632 1036 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1037
55335137 1038 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1039 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1040 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1041 mgmt->sa);
fc10302e 1042 goto unlock_rcu;
55335137
AN		 1043 }
1044
c3896d2c 1045 /* Now we will figure out the appropriate event... */
c99a89ed 1046 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1047
1048 if (event == OPN_ACPT) {
296fcba3 1049 rcu_read_unlock();
54ab1ffb 1050 /* allocate sta entry if necessary and update info */
05a23ae9 1051 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
54ab1ffb 1052 if (!sta) {
bdcbd8e0 1053 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1054 goto unlock_rcu;
54ab1ffb 1055 }
5bbdd6c6 1056 sta->plid = plid;
c99a89ed
TP		 1057 } else if (!sta && event == OPN_RJCT) {
1058 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1059 mgmt->sa, 0, plid,
6f101ef0 1060 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1061 goto unlock_rcu;
1062 } else if (!sta || event == PLINK_UNDEFINED) {
1063 /* something went wrong */
1064 goto unlock_rcu;
c3896d2c
LCC		 1065 }
1066
c7e67811 1067 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1068
fc10302e 1069unlock_rcu:
d0709a65 1070 rcu_read_unlock();
57aac7c5 1071
ecccd072 1072 if (changed)
2b5e1967 1073 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1074}
05a23ae9
TP		 1075
1076void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1077 struct ieee80211_mgmt *mgmt, size_t len,
1078 struct ieee80211_rx_status *rx_status)
1079{
1080 struct ieee802_11_elems elems;
1081 size_t baselen;
1082 u8 *baseaddr;
1083
1084 /* need action_code, aux */
1085 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1086 return;
1087
1088 if (sdata->u.mesh.user_mpm)
1089 /* userspace must register for these */
1090 return;
1091
1092 if (is_multicast_ether_addr(mgmt->da)) {
1093 mpl_dbg(sdata,
1094 "Mesh plink: ignore frame from multicast address\n");
1095 return;
1096 }
1097
1098 baseaddr = mgmt->u.action.u.self_prot.variable;
1099 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1100 if (mgmt->u.action.u.self_prot.action_code ==
1101 WLAN_SP_MESH_PEERING_CONFIRM) {
1102 baseaddr += 4;
1103 baselen += 4;
1104 }
1105 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1106 mesh_process_plink_frame(sdata, mgmt, &elems);
1107}
Linux kernel - Deliverables
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