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mac80211: factor out plink event gathering
[mirror_ubuntu-zesty-kernel.git] / net / mac80211 / mesh_plink.c
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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
JB		 57 enum ieee80211_self_protected_actioncode action,
58 u8 *da, __le16 llid, __le16 plid, __le16 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);
ba4a14e1
TP		 249 sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED);
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
JB		 259 enum ieee80211_self_protected_actioncode action,
260 u8 *da, __le16 llid, __le16 plid, __le16 reason)
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);
77fa76bb 308 memcpy(pos + 2, &plid, 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;
c3896d2c 350 memcpy(pos, &llid, 2);
8db09850 351 pos += 2;
c3896d2c 352 if (include_plid) {
c3896d2c 353 memcpy(pos, &plid, 2);
8db09850 354 pos += 2;
c3896d2c 355 }
54ef656b 356 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
c3896d2c 357 memcpy(pos, &reason, 2);
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);
440
441 return sta;
442}
443
444static struct sta_info *
445mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
446 struct ieee802_11_elems *elems)
447{
448 struct sta_info *sta = NULL;
449
a6dad6a2
TP		 450 /* Userspace handles station allocation */
451 if (sdata->u.mesh.user_mpm ||
452 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
296fcba3
TP		 453 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
454 elems->ie_start,
455 elems->total_len,
456 GFP_KERNEL);
457 else
458 sta = __mesh_sta_info_alloc(sdata, addr);
459
54ab1ffb
TP		 460 return sta;
461}
462
296fcba3
TP		 463/*
464 * mesh_sta_info_get - return mesh sta info entry for @addr.
465 *
466 * @sdata: local meshif
467 * @addr: peer's address
468 * @elems: IEs from beacon or mesh peering frame.
469 *
470 * Return existing or newly allocated sta_info under RCU read lock.
471 * (re)initialize with given IEs.
472 */
473static struct sta_info *
474mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
475 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
476{
477 struct sta_info *sta = NULL;
478
479 rcu_read_lock();
480 sta = sta_info_get(sdata, addr);
481 if (sta) {
482 mesh_sta_info_init(sdata, sta, elems, false);
483 } else {
484 rcu_read_unlock();
485 /* can't run atomic */
486 sta = mesh_sta_info_alloc(sdata, addr, elems);
487 if (!sta) {
488 rcu_read_lock();
489 return NULL;
490 }
491
3b4797bc
TP		 492 mesh_sta_info_init(sdata, sta, elems, true);
493
296fcba3
TP		 494 if (sta_info_insert_rcu(sta))
495 return NULL;
496 }
497
498 return sta;
499}
500
501/*
502 * mesh_neighbour_update - update or initialize new mesh neighbor.
503 *
504 * @sdata: local meshif
505 * @addr: peer's address
506 * @elems: IEs from beacon or mesh peering frame
507 *
508 * Initiates peering if appropriate.
509 */
f743ff49
TP		 510void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
511 u8 *hw_addr,
54ab1ffb
TP		 512 struct ieee802_11_elems *elems)
513{
514 struct sta_info *sta;
39886b61 515 u32 changed = 0;
54ab1ffb 516
296fcba3 517 sta = mesh_sta_info_get(sdata, hw_addr, elems);
54ab1ffb
TP		 518 if (!sta)
519 goto out;
520
1570ca59 521 if (mesh_peer_accepts_plinks(elems) &&
54ab1ffb
TP		 522 sta->plink_state == NL80211_PLINK_LISTEN &&
523 sdata->u.mesh.accepting_plinks &&
524 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 525 rssi_threshold_check(sdata, sta))
39886b61 526 changed = mesh_plink_open(sta);
c3896d2c 527
3f52b7e3 528 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 529out:
d0709a65 530 rcu_read_unlock();
2b5e1967 531 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 532}
533
534static void mesh_plink_timer(unsigned long data)
535{
536 struct sta_info *sta;
537 __le16 llid, plid, reason;
c3896d2c 538 struct ieee80211_sub_if_data *sdata;
453e66f2 539 struct mesh_config *mshcfg;
4efec451 540 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 541
d0709a65
JB		 542 /*
543 * This STA is valid because sta_info_destroy() will
544 * del_timer_sync() this timer after having made sure
545 * it cannot be readded (by deleting the plink.)
546 */
c3896d2c
LCC		 547 sta = (struct sta_info *) data;
548
690205f1 549 if (sta->sdata->local->quiescing)
5bb644a0 550 return;
5bb644a0 551
07346f81 552 spin_lock_bh(&sta->lock);
c3896d2c
LCC		 553 if (sta->ignore_plink_timer) {
554 sta->ignore_plink_timer = false;
07346f81 555 spin_unlock_bh(&sta->lock);
c3896d2c
LCC		 556 return;
557 }
bdcbd8e0 558 mpl_dbg(sta->sdata,
3088f7d2
TP		 559 "Mesh plink timer for %pM fired on state %s\n",
560 sta->sta.addr, mplstates[sta->plink_state]);
c3896d2c
LCC		 561 reason = 0;
562 llid = sta->llid;
563 plid = sta->plid;
d0709a65 564 sdata = sta->sdata;
453e66f2 565 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c
LCC		 566
567 switch (sta->plink_state) {
57cf8043
JC		 568 case NL80211_PLINK_OPN_RCVD:
569 case NL80211_PLINK_OPN_SNT:
c3896d2c 570 /* retry timer */
453e66f2 571 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 572 u32 rand;
bdcbd8e0
JB		 573 mpl_dbg(sta->sdata,
574 "Mesh plink for %pM (retry, timeout): %d %d\n",
0c68ae26
JB		 575 sta->sta.addr, sta->plink_retries,
576 sta->plink_timeout);
c3896d2c
LCC		 577 get_random_bytes(&rand, sizeof(u32));
578 sta->plink_timeout = sta->plink_timeout +
579 rand % sta->plink_timeout;
580 ++sta->plink_retries;
d0709a65 581 mod_plink_timer(sta, sta->plink_timeout);
4efec451 582 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 583 break;
584 }
54ef656b 585 reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES);
c3896d2c 586 /* fall through on else */
57cf8043 587 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 588 /* confirm timer */
589 if (!reason)
54ef656b 590 reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT);
57cf8043 591 sta->plink_state = NL80211_PLINK_HOLDING;
453e66f2 592 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 593 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 594 break;
57cf8043 595 case NL80211_PLINK_HOLDING:
c3896d2c 596 /* holding timer */
d0709a65 597 del_timer(&sta->plink_timer);
c3896d2c 598 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 599 break;
600 default:
c3896d2c
LCC		 601 break;
602 }
0f5ffd24 603 spin_unlock_bh(&sta->lock);
4efec451
TP		 604 if (action)
605 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
606 llid, plid, reason);
c3896d2c
LCC		 607}
608
609static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
610{
611 sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
612 sta->plink_timer.data = (unsigned long) sta;
613 sta->plink_timer.function = mesh_plink_timer;
614 sta->plink_timeout = timeout;
c3896d2c
LCC		 615 add_timer(&sta->plink_timer);
616}
617
39886b61 618u32 mesh_plink_open(struct sta_info *sta)
c3896d2c
LCC		 619{
620 __le16 llid;
d0709a65 621 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 622 u32 changed;
c3896d2c 623
c2c98fde 624 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 625 return 0;
53e80511 626
07346f81 627 spin_lock_bh(&sta->lock);
c3896d2c
LCC		 628 get_random_bytes(&llid, 2);
629 sta->llid = llid;
9385d04f
CYY		 630 if (sta->plink_state != NL80211_PLINK_LISTEN &&
631 sta->plink_state != NL80211_PLINK_BLOCKED) {
07346f81 632 spin_unlock_bh(&sta->lock);
39886b61 633 return 0;
c3896d2c 634 }
57cf8043 635 sta->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 636 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
07346f81 637 spin_unlock_bh(&sta->lock);
bdcbd8e0
JB		 638 mpl_dbg(sdata,
639 "Mesh plink: starting establishment with %pM\n",
0c68ae26 640 sta->sta.addr);
c3896d2c 641
3f52b7e3 642 /* set the non-peer mode to active during peering */
39886b61 643 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 644
39886b61
TP		 645 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
646 sta->sta.addr, llid, 0, 0);
647 return changed;
c3896d2c
LCC		 648}
649
39886b61 650u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 651{
df323818 652 u32 changed;
c9370197 653
07346f81 654 spin_lock_bh(&sta->lock);
df323818 655 changed = __mesh_plink_deactivate(sta);
57cf8043 656 sta->plink_state = NL80211_PLINK_BLOCKED;
07346f81 657 spin_unlock_bh(&sta->lock);
c9370197 658
39886b61 659 return changed;
c3896d2c
LCC		 660}
661
e76d67f0
BC		 662static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
663 struct sta_info *sta,
664 enum plink_event event)
665{
666 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
667
668 __le16 reason = (event == CLS_ACPT) ?
669 cpu_to_le16(WLAN_REASON_MESH_CLOSE) :
670 cpu_to_le16(WLAN_REASON_MESH_CONFIG);
671
672 sta->reason = reason;
673 sta->plink_state = NL80211_PLINK_HOLDING;
272a9e26 674 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 675}
676
677static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
678 struct sta_info *sta)
679{
680 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
681 u32 changed = 0;
682
683 del_timer(&sta->plink_timer);
684 sta->plink_state = NL80211_PLINK_ESTAB;
685 changed |= mesh_plink_inc_estab_count(sdata);
686 changed |= mesh_set_ht_prot_mode(sdata);
687 changed |= mesh_set_short_slot_time(sdata);
688 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
689 ieee80211_mps_sta_status_update(sta);
690 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
691 return changed;
692}
693
c7e67811
TP		 694/**
695 * mesh_plink_fsm - step @sta MPM based on @event
696 *
697 * @sdata: interface
698 * @sta: mesh neighbor
699 * @event: peering event
700 *
701 * Return: changed MBSS flags
702 */
703static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
704 struct sta_info *sta, enum plink_event event)
705{
706 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
707 enum ieee80211_self_protected_actioncode action = 0;
708 u32 changed = 0;
709
710 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
711 mplstates[sta->plink_state], mplevents[event]);
712
713 spin_lock_bh(&sta->lock);
714 switch (sta->plink_state) {
715 case NL80211_PLINK_LISTEN:
716 switch (event) {
717 case CLS_ACPT:
718 mesh_plink_fsm_restart(sta);
719 break;
720 case OPN_ACPT:
721 sta->plink_state = NL80211_PLINK_OPN_RCVD;
722 get_random_bytes(&sta->llid, 2);
723 mesh_plink_timer_set(sta,
724 mshcfg->dot11MeshRetryTimeout);
725
726 /* set the non-peer mode to active during peering */
727 changed |= ieee80211_mps_local_status_update(sdata);
728 action = WLAN_SP_MESH_PEERING_OPEN;
729 break;
730 default:
731 break;
732 }
733 break;
734 case NL80211_PLINK_OPN_SNT:
735 switch (event) {
736 case OPN_RJCT:
737 case CNF_RJCT:
738 case CLS_ACPT:
739 mesh_plink_close(sdata, sta, event);
740 action = WLAN_SP_MESH_PEERING_CLOSE;
741 break;
742 case OPN_ACPT:
743 /* retry timer is left untouched */
744 sta->plink_state = NL80211_PLINK_OPN_RCVD;
745 action = WLAN_SP_MESH_PEERING_CONFIRM;
746 break;
747 case CNF_ACPT:
748 sta->plink_state = NL80211_PLINK_CNF_RCVD;
749 if (!mod_plink_timer(sta,
750 mshcfg->dot11MeshConfirmTimeout))
751 sta->ignore_plink_timer = true;
752 break;
753 default:
754 break;
755 }
756 break;
757 case NL80211_PLINK_OPN_RCVD:
758 switch (event) {
759 case OPN_RJCT:
760 case CNF_RJCT:
761 case CLS_ACPT:
762 mesh_plink_close(sdata, sta, event);
763 action = WLAN_SP_MESH_PEERING_CLOSE;
764 break;
765 case OPN_ACPT:
766 action = WLAN_SP_MESH_PEERING_CONFIRM;
767 break;
768 case CNF_ACPT:
769 changed |= mesh_plink_establish(sdata, sta);
770 break;
771 default:
772 break;
773 }
774 break;
775 case NL80211_PLINK_CNF_RCVD:
776 switch (event) {
777 case OPN_RJCT:
778 case CNF_RJCT:
779 case CLS_ACPT:
780 mesh_plink_close(sdata, sta, event);
781 action = WLAN_SP_MESH_PEERING_CLOSE;
782 break;
783 case OPN_ACPT:
784 changed |= mesh_plink_establish(sdata, sta);
785 action = WLAN_SP_MESH_PEERING_CONFIRM;
786 break;
787 default:
788 break;
789 }
790 break;
791 case NL80211_PLINK_ESTAB:
792 switch (event) {
793 case CLS_ACPT:
794 changed |= __mesh_plink_deactivate(sta);
795 changed |= mesh_set_ht_prot_mode(sdata);
796 changed |= mesh_set_short_slot_time(sdata);
797 mesh_plink_close(sdata, sta, event);
798 action = WLAN_SP_MESH_PEERING_CLOSE;
799 break;
800 case OPN_ACPT:
801 action = WLAN_SP_MESH_PEERING_CONFIRM;
802 break;
803 default:
804 break;
805 }
806 break;
807 case NL80211_PLINK_HOLDING:
808 switch (event) {
809 case CLS_ACPT:
810 if (del_timer(&sta->plink_timer))
811 sta->ignore_plink_timer = 1;
812 mesh_plink_fsm_restart(sta);
813 break;
814 case OPN_ACPT:
815 case CNF_ACPT:
816 case OPN_RJCT:
817 case CNF_RJCT:
818 action = WLAN_SP_MESH_PEERING_CLOSE;
819 break;
820 default:
821 break;
822 }
823 break;
824 default:
825 /* should not get here, PLINK_BLOCKED is dealt with at the
826 * beginning of the function
827 */
828 break;
829 }
830 spin_unlock_bh(&sta->lock);
831 if (action) {
832 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
833 sta->llid, sta->plid, sta->reason);
834
835 /* also send confirm in open case */
836 if (action == WLAN_SP_MESH_PEERING_OPEN) {
837 mesh_plink_frame_tx(sdata,
838 WLAN_SP_MESH_PEERING_CONFIRM,
839 sta->sta.addr, sta->llid,
840 sta->plid, 0);
841 }
842 }
843
844 return changed;
845}
846
c99a89ed
TP		 847/*
848 * mesh_plink_get_event - get correct MPM event
849 *
850 * @sdata: interface
851 * @sta: peer, leave NULL if processing a frame from a new suitable peer
852 * @elems: peering management IEs
853 * @ftype: frame type
854 * @llid: peer's peer link ID
855 * @plid: peer's local link ID
856 *
857 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
858 * an error.
859 */
860static enum plink_event
861mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
862 struct sta_info *sta,
863 struct ieee802_11_elems *elems,
864 enum ieee80211_self_protected_actioncode ftype,
865 __le16 llid, __le16 plid)
866{
867 enum plink_event event = PLINK_UNDEFINED;
868 u8 ie_len = elems->peering_len;
869 bool matches_local;
870
871 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
872 mesh_matches_local(sdata, elems));
873
874 /* deny open request from non-matching peer */
875 if (!matches_local && !sta) {
876 event = OPN_RJCT;
877 goto out;
878 }
879
880 if (!sta) {
881 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
882 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
883 goto out;
884 }
885 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
886 if (!mesh_plink_free_count(sdata)) {
887 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
888 goto out;
889 }
890 } else {
891 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
892 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
893 goto out;
894 }
895 if (sta->plink_state == NL80211_PLINK_BLOCKED)
896 goto out;
897 }
898
899 /* new matching peer */
900 if (!sta) {
901 event = OPN_ACPT;
902 goto out;
903 }
904
905 switch (ftype) {
906 case WLAN_SP_MESH_PEERING_OPEN:
907 if (!matches_local)
908 event = OPN_RJCT;
909 if (!mesh_plink_free_count(sdata) ||
910 (sta->plid && sta->plid != plid))
911 event = OPN_IGNR;
912 else
913 event = OPN_ACPT;
914 break;
915 case WLAN_SP_MESH_PEERING_CONFIRM:
916 if (!matches_local)
917 event = CNF_RJCT;
918 if (!mesh_plink_free_count(sdata) ||
919 (sta->llid != llid || sta->plid != plid))
920 event = CNF_IGNR;
921 else
922 event = CNF_ACPT;
923 break;
924 case WLAN_SP_MESH_PEERING_CLOSE:
925 if (sta->plink_state == NL80211_PLINK_ESTAB)
926 /* Do not check for llid or plid. This does not
927 * follow the standard but since multiple plinks
928 * per sta are not supported, it is necessary in
929 * order to avoid a livelock when MP A sees an
930 * establish peer link to MP B but MP B does not
931 * see it. This can be caused by a timeout in
932 * B's peer link establishment or B beign
933 * restarted.
934 */
935 event = CLS_ACPT;
936 else if (sta->plid != plid)
937 event = CLS_IGNR;
938 else if (ie_len == 8 && sta->llid != llid)
939 event = CLS_IGNR;
940 else
941 event = CLS_ACPT;
942 break;
943 default:
944 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
945 break;
946 }
947
948out:
949 return event;
950}
951
05a23ae9
TP		 952static void
953mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
954 struct ieee80211_mgmt *mgmt,
955 struct ieee802_11_elems *elems)
c3896d2c 956{
05a23ae9 957
c3896d2c
LCC		 958 struct sta_info *sta;
959 enum plink_event event;
54ef656b 960 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 961 u32 changed = 0;
c99a89ed 962 u8 ie_len = elems->peering_len;
c7e67811 963 __le16 plid, llid = 0;
c3896d2c 964
05a23ae9 965 if (!elems->peering) {
bdcbd8e0
JB		 966 mpl_dbg(sdata,
967 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 968 return;
969 }
bf7cd94d 970
05a23ae9 971 if (elems->rsn_len &&
bf7cd94d 972 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 973 mpl_dbg(sdata,
974 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 975 return;
976 }
c3896d2c 977
8db09850 978 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 979 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
980 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
981 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
982 && ie_len != 8)) {
bdcbd8e0
JB		 983 mpl_dbg(sdata,
984 "Mesh plink: incorrect plink ie length %d %d\n",
985 ftype, ie_len);
c3896d2c
LCC		 986 return;
987 }
988
54ef656b 989 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 990 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 991 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 992 return;
993 }
994 /* Note the lines below are correct, the llid in the frame is the plid
995 * from the point of view of this host.
996 */
05a23ae9 997 memcpy(&plid, PLINK_GET_LLID(elems->peering), 2);
54ef656b 998 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
8db09850 999 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
05a23ae9 1000 memcpy(&llid, PLINK_GET_PLID(elems->peering), 2);
c3896d2c 1001
296fcba3 1002 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1003 rcu_read_lock();
1004
abe60632 1005 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1006
55335137 1007 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1008 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1009 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1010 mgmt->sa);
fc10302e 1011 goto unlock_rcu;
55335137
AN		 1012 }
1013
c3896d2c 1014 /* Now we will figure out the appropriate event... */
c99a89ed 1015 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1016
1017 if (event == OPN_ACPT) {
296fcba3 1018 rcu_read_unlock();
54ab1ffb 1019 /* allocate sta entry if necessary and update info */
05a23ae9 1020 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
54ab1ffb 1021 if (!sta) {
bdcbd8e0 1022 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1023 goto unlock_rcu;
54ab1ffb 1024 }
5bbdd6c6 1025 sta->plid = plid;
c99a89ed
TP		 1026 } else if (!sta && event == OPN_RJCT) {
1027 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1028 mgmt->sa, 0, plid,
1029 cpu_to_le16(WLAN_REASON_MESH_CONFIG));
1030 goto unlock_rcu;
1031 } else if (!sta || event == PLINK_UNDEFINED) {
1032 /* something went wrong */
1033 goto unlock_rcu;
c3896d2c
LCC		 1034 }
1035
c7e67811 1036 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1037
fc10302e 1038unlock_rcu:
d0709a65 1039 rcu_read_unlock();
57aac7c5 1040
ecccd072 1041 if (changed)
2b5e1967 1042 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1043}
05a23ae9
TP		 1044
1045void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1046 struct ieee80211_mgmt *mgmt, size_t len,
1047 struct ieee80211_rx_status *rx_status)
1048{
1049 struct ieee802_11_elems elems;
1050 size_t baselen;
1051 u8 *baseaddr;
1052
1053 /* need action_code, aux */
1054 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1055 return;
1056
1057 if (sdata->u.mesh.user_mpm)
1058 /* userspace must register for these */
1059 return;
1060
1061 if (is_multicast_ether_addr(mgmt->da)) {
1062 mpl_dbg(sdata,
1063 "Mesh plink: ignore frame from multicast address\n");
1064 return;
1065 }
1066
1067 baseaddr = mgmt->u.action.u.self_prot.variable;
1068 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1069 if (mgmt->u.action.u.self_prot.action_code ==
1070 WLAN_SP_MESH_PEERING_CONFIRM) {
1071 baseaddr += 4;
1072 baselen += 4;
1073 }
1074 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1075 mesh_process_plink_frame(sdata, mgmt, &elems);
1076}
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