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Merge branch 'for-rafael' of https://git.kernel.org/pub/scm/linux/kernel/git/mzx...
[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
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 ||
40d9a38a 63 (sta && (s8) -ewma_signal_read(&sta->avg_signal) > rssi_threshold);
36c9bb29
BC		 64}
65
c3896d2c
LCC		 66/**
67 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
68 *
23c7a29c 69 * @sta: mesh peer link to restart
c3896d2c 70 *
433f5bc1 71 * Locking: this function must be called holding sta->mesh->plink_lock
c3896d2c
LCC		 72 */
73static inline void mesh_plink_fsm_restart(struct sta_info *sta)
74{
433f5bc1
JB		 75 lockdep_assert_held(&sta->mesh->plink_lock);
76 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
77 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
78 sta->mesh->plink_retries = 0;
c3896d2c
LCC		 79}
80
3b144658
TP		 81/*
82 * mesh_set_short_slot_time - enable / disable ERP short slot time.
83 *
84 * The standard indirectly mandates mesh STAs to turn off short slot time by
85 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
86 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
87 * MBSS support ERP rates.
88 *
89 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
90 */
91static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
92{
93 struct ieee80211_local *local = sdata->local;
94 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
95 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
96 struct sta_info *sta;
97 u32 erp_rates = 0, changed = 0;
98 int i;
99 bool short_slot = false;
100
101 if (band == IEEE80211_BAND_5GHZ) {
102 /* (IEEE 802.11-2012 19.4.5) */
103 short_slot = true;
104 goto out;
ea1b2b45 105 } else if (band != IEEE80211_BAND_2GHZ)
3b144658
TP		 106 goto out;
107
108 for (i = 0; i < sband->n_bitrates; i++)
109 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
110 erp_rates |= BIT(i);
111
112 if (!erp_rates)
113 goto out;
114
115 rcu_read_lock();
116 list_for_each_entry_rcu(sta, &local->sta_list, list) {
117 if (sdata != sta->sdata ||
433f5bc1 118 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
3b144658
TP		 119 continue;
120
121 short_slot = false;
122 if (erp_rates & sta->sta.supp_rates[band])
123 short_slot = true;
124 else
125 break;
126 }
127 rcu_read_unlock();
128
129out:
130 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
131 sdata->vif.bss_conf.use_short_slot = short_slot;
132 changed = BSS_CHANGED_ERP_SLOT;
133 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
134 sdata->vif.addr, short_slot);
135 }
136 return changed;
137}
138
2c53040f 139/**
cbf9322e 140 * mesh_set_ht_prot_mode - set correct HT protection mode
57aac7c5 141 *
cbf9322e
AN		 142 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
143 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
144 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
145 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
146 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
147 * HT20 peer is present. Otherwise no-protection mode is selected.
57aac7c5
AN		 148 */
149static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
150{
151 struct ieee80211_local *local = sdata->local;
152 struct sta_info *sta;
57aac7c5
AN		 153 u16 ht_opmode;
154 bool non_ht_sta = false, ht20_sta = false;
155
0418a445
SW		 156 switch (sdata->vif.bss_conf.chandef.width) {
157 case NL80211_CHAN_WIDTH_20_NOHT:
158 case NL80211_CHAN_WIDTH_5:
159 case NL80211_CHAN_WIDTH_10:
57aac7c5 160 return 0;
0418a445
SW		 161 default:
162 break;
163 }
57aac7c5
AN		 164
165 rcu_read_lock();
166 list_for_each_entry_rcu(sta, &local->sta_list, list) {
cbf9322e 167 if (sdata != sta->sdata ||
433f5bc1 168 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
cbf9322e
AN		 169 continue;
170
52ac8c48
TP		 171 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
172 continue;
173
174 if (!sta->sta.ht_cap.ht_supported) {
175 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
176 sta->sta.addr);
cbf9322e 177 non_ht_sta = true;
cbf9322e 178 break;
57aac7c5 179 }
52ac8c48
TP		 180
181 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
182 ht20_sta = true;
57aac7c5 183 }
57aac7c5
AN		 184 rcu_read_unlock();
185
186 if (non_ht_sta)
187 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
466f310d 188 else if (ht20_sta &&
4bf88530 189 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
57aac7c5
AN		 190 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
191 else
192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
193
52ac8c48
TP		 194 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
195 return 0;
57aac7c5 196
52ac8c48
TP		 197 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
198 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
199 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
200 return BSS_CHANGED_HT;
57aac7c5
AN		 201}
202
f698d856 203static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
a69bd8e6 204 struct sta_info *sta,
bf7cd94d 205 enum ieee80211_self_protected_actioncode action,
6f101ef0 206 u8 *da, u16 llid, u16 plid, u16 reason)
bf7cd94d 207{
f698d856 208 struct ieee80211_local *local = sdata->local;
3b69a9c5 209 struct sk_buff *skb;
e7570dfb 210 struct ieee80211_tx_info *info;
c3896d2c
LCC		 211 struct ieee80211_mgmt *mgmt;
212 bool include_plid = false;
8db09850 213 u16 peering_proto = 0;
3b69a9c5
TP		 214 u8 *pos, ie_len = 4;
215 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
216 sizeof(mgmt->u.action.u.self_prot);
f609a43d 217 int err = -ENOMEM;
3b69a9c5 218
65e8b0cc 219 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 220 hdr_len +
221 2 + /* capability info */
222 2 + /* AID */
223 2 + 8 + /* supported rates */
224 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
225 2 + sdata->u.mesh.mesh_id_len +
226 2 + sizeof(struct ieee80211_meshconf_ie) +
176f3608 227 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 228 2 + sizeof(struct ieee80211_ht_operation) +
3b69a9c5
TP		 229 2 + 8 + /* peering IE */
230 sdata->u.mesh.ie_len);
c3896d2c 231 if (!skb)
87d84c45 232 return err;
e7570dfb 233 info = IEEE80211_SKB_CB(skb);
65e8b0cc 234 skb_reserve(skb, local->tx_headroom);
3b69a9c5
TP		 235 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
236 memset(mgmt, 0, hdr_len);
e7827a70
HH		 237 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
238 IEEE80211_STYPE_ACTION);
c3896d2c 239 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 240 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 241 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 242 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
243 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 244
8db09850 245 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
55de908a
JB		 246 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
247
8db09850
TP		 248 /* capability info */
249 pos = skb_put(skb, 2);
250 memset(pos, 0, 2);
54ef656b 251 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 252 /* AID */
253 pos = skb_put(skb, 2);
a69bd8e6 254 put_unaligned_le16(sta->sta.aid, pos);
c3896d2c 255 }
55de908a
JB		 256 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
257 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 258 mesh_add_rsn_ie(sdata, skb) ||
259 mesh_add_meshid_ie(sdata, skb) ||
260 mesh_add_meshconf_ie(sdata, skb))
f609a43d 261 goto free;
8db09850 262 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 263 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 264 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 265 goto free;
c3896d2c
LCC		 266 }
267
8db09850 268 /* Add Mesh Peering Management element */
c3896d2c 269 switch (action) {
54ef656b 270 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 271 break;
54ef656b 272 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 273 ie_len += 2;
c3896d2c
LCC		 274 include_plid = true;
275 break;
54ef656b 276 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 277 if (plid) {
278 ie_len += 2;
c3896d2c
LCC		 279 include_plid = true;
280 }
8db09850 281 ie_len += 2; /* reason code */
c3896d2c 282 break;
8db09850 283 default:
f609a43d
TP		 284 err = -EINVAL;
285 goto free;
c3896d2c
LCC		 286 }
287
8db09850 288 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 289 goto free;
8db09850 290
c3896d2c 291 pos = skb_put(skb, 2 + ie_len);
8db09850 292 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 293 *pos++ = ie_len;
8db09850
TP		 294 memcpy(pos, &peering_proto, 2);
295 pos += 2;
6f101ef0 296 put_unaligned_le16(llid, pos);
8db09850 297 pos += 2;
c3896d2c 298 if (include_plid) {
6f101ef0 299 put_unaligned_le16(plid, pos);
8db09850 300 pos += 2;
c3896d2c 301 }
54ef656b 302 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 303 put_unaligned_le16(reason, pos);
8db09850 304 pos += 2;
c3896d2c 305 }
176f3608
TP		 306
307 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d
JB		 308 if (mesh_add_ht_cap_ie(sdata, skb) ||
309 mesh_add_ht_oper_ie(sdata, skb))
f609a43d 310 goto free;
176f3608
TP		 311 }
312
bf7cd94d 313 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 314 goto free;
c3896d2c 315
62ae67be 316 ieee80211_tx_skb(sdata, skb);
c3896d2c 317 return 0;
f609a43d
TP		 318free:
319 kfree_skb(skb);
320 return err;
c3896d2c
LCC		 321}
322
fa87a656
BC		 323/**
324 * __mesh_plink_deactivate - deactivate mesh peer link
325 *
326 * @sta: mesh peer link to deactivate
327 *
328 * All mesh paths with this peer as next hop will be flushed
329 * Returns beacon changed flag if the beacon content changed.
330 *
331 * Locking: the caller must hold sta->mesh->plink_lock
332 */
333static u32 __mesh_plink_deactivate(struct sta_info *sta)
334{
335 struct ieee80211_sub_if_data *sdata = sta->sdata;
336 u32 changed = 0;
337
338 lockdep_assert_held(&sta->mesh->plink_lock);
339
340 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
341 changed = mesh_plink_dec_estab_count(sdata);
342 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
343 mesh_path_flush_by_nexthop(sta);
344
345 ieee80211_mps_sta_status_update(sta);
346 changed |= ieee80211_mps_set_sta_local_pm(sta,
347 NL80211_MESH_POWER_UNKNOWN);
348
349 return changed;
350}
351
352/**
353 * mesh_plink_deactivate - deactivate mesh peer link
354 *
355 * @sta: mesh peer link to deactivate
356 *
357 * All mesh paths with this peer as next hop will be flushed
358 */
359u32 mesh_plink_deactivate(struct sta_info *sta)
360{
361 struct ieee80211_sub_if_data *sdata = sta->sdata;
362 u32 changed;
363
364 spin_lock_bh(&sta->mesh->plink_lock);
365 changed = __mesh_plink_deactivate(sta);
366 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
a69bd8e6 367 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
fa87a656
BC		 368 sta->sta.addr, sta->mesh->llid, sta->mesh->plid,
369 sta->mesh->reason);
370 spin_unlock_bh(&sta->mesh->plink_lock);
371
372 return changed;
373}
374
296fcba3
TP		 375static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
376 struct sta_info *sta,
377 struct ieee802_11_elems *elems, bool insert)
c3896d2c 378{
f698d856 379 struct ieee80211_local *local = sdata->local;
55de908a 380 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
54ab1ffb 381 struct ieee80211_supported_band *sband;
f68d776a 382 u32 rates, basic_rates = 0, changed = 0;
abcff6ef 383 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
c3896d2c 384
f743ff49 385 sband = local->hw.wiphy->bands[band];
2103dec1 386 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
d0709a65 387
433f5bc1 388 spin_lock_bh(&sta->mesh->plink_lock);
c3896d2c 389 sta->last_rx = jiffies;
296fcba3
TP		 390
391 /* rates and capabilities don't change during peering */
433f5bc1
JB		 392 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
393 sta->mesh->processed_beacon)
296fcba3 394 goto out;
433f5bc1 395 sta->mesh->processed_beacon = true;
bae35d92 396
f68d776a
TP		 397 if (sta->sta.supp_rates[band] != rates)
398 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
f743ff49 399 sta->sta.supp_rates[band] = rates;
54ab1ffb 400
52ac8c48
TP		 401 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
402 elems->ht_cap_elem, sta))
403 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 404
abcff6ef
JD		 405 if (bw != sta->sta.bandwidth)
406 changed |= IEEE80211_RC_BW_CHANGED;
407
52ac8c48
TP		 408 /* HT peer is operating 20MHz-only */
409 if (elems->ht_operation &&
410 !(elems->ht_operation->ht_param &
411 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
412 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 413 changed |= IEEE80211_RC_BW_CHANGED;
52ac8c48 414 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 415 }
c7d25828 416
59cf1d65
HS		 417 if (insert)
418 rate_control_rate_init(sta);
f68d776a
TP		 419 else
420 rate_control_rate_update(local, sband, sta, changed);
296fcba3 421out:
433f5bc1 422 spin_unlock_bh(&sta->mesh->plink_lock);
296fcba3
TP		 423}
424
0e0060fc
BC		 425static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
426{
427 struct sta_info *sta;
428 unsigned long *aid_map;
429 int aid;
430
431 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
432 sizeof(*aid_map), GFP_KERNEL);
433 if (!aid_map)
434 return -ENOMEM;
435
436 /* reserve aid 0 for mcast indication */
437 __set_bit(0, aid_map);
438
439 rcu_read_lock();
440 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
441 __set_bit(sta->sta.aid, aid_map);
442 rcu_read_unlock();
443
444 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
445 kfree(aid_map);
446
447 if (aid > IEEE80211_MAX_AID)
448 return -ENOBUFS;
449
450 return aid;
451}
452
296fcba3
TP		 453static struct sta_info *
454__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
455{
456 struct sta_info *sta;
0e0060fc 457 int aid;
54ab1ffb 458
296fcba3 459 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 460 return NULL;
461
0e0060fc
BC		 462 aid = mesh_allocate_aid(sdata);
463 if (aid < 0)
464 return NULL;
465
296fcba3
TP		 466 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
467 if (!sta)
468 return NULL;
469
433f5bc1 470 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 471 sta->sta.wme = true;
0e0060fc 472 sta->sta.aid = aid;
296fcba3
TP		 473
474 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
475 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
476 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
477
296fcba3
TP		 478 return sta;
479}
480
481static struct sta_info *
482mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
483 struct ieee802_11_elems *elems)
484{
485 struct sta_info *sta = NULL;
486
a6dad6a2
TP		 487 /* Userspace handles station allocation */
488 if (sdata->u.mesh.user_mpm ||
489 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
296fcba3
TP		 490 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
491 elems->ie_start,
492 elems->total_len,
493 GFP_KERNEL);
494 else
495 sta = __mesh_sta_info_alloc(sdata, addr);
496
54ab1ffb
TP		 497 return sta;
498}
499
296fcba3
TP		 500/*
501 * mesh_sta_info_get - return mesh sta info entry for @addr.
502 *
503 * @sdata: local meshif
504 * @addr: peer's address
505 * @elems: IEs from beacon or mesh peering frame.
506 *
507 * Return existing or newly allocated sta_info under RCU read lock.
508 * (re)initialize with given IEs.
509 */
510static struct sta_info *
511mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
512 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
513{
514 struct sta_info *sta = NULL;
515
516 rcu_read_lock();
517 sta = sta_info_get(sdata, addr);
518 if (sta) {
519 mesh_sta_info_init(sdata, sta, elems, false);
520 } else {
521 rcu_read_unlock();
522 /* can't run atomic */
523 sta = mesh_sta_info_alloc(sdata, addr, elems);
524 if (!sta) {
525 rcu_read_lock();
526 return NULL;
527 }
528
3b4797bc
TP		 529 mesh_sta_info_init(sdata, sta, elems, true);
530
296fcba3
TP		 531 if (sta_info_insert_rcu(sta))
532 return NULL;
533 }
534
535 return sta;
536}
537
538/*
539 * mesh_neighbour_update - update or initialize new mesh neighbor.
540 *
541 * @sdata: local meshif
542 * @addr: peer's address
543 * @elems: IEs from beacon or mesh peering frame
544 *
545 * Initiates peering if appropriate.
546 */
f743ff49
TP		 547void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
548 u8 *hw_addr,
54ab1ffb
TP		 549 struct ieee802_11_elems *elems)
550{
551 struct sta_info *sta;
39886b61 552 u32 changed = 0;
54ab1ffb 553
296fcba3 554 sta = mesh_sta_info_get(sdata, hw_addr, elems);
54ab1ffb
TP		 555 if (!sta)
556 goto out;
557
1570ca59 558 if (mesh_peer_accepts_plinks(elems) &&
433f5bc1 559 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
54ab1ffb
TP		 560 sdata->u.mesh.accepting_plinks &&
561 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 562 rssi_threshold_check(sdata, sta))
39886b61 563 changed = mesh_plink_open(sta);
c3896d2c 564
3f52b7e3 565 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 566out:
d0709a65 567 rcu_read_unlock();
2b5e1967 568 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 569}
570
571static void mesh_plink_timer(unsigned long data)
572{
573 struct sta_info *sta;
6f101ef0 574 u16 reason = 0;
c3896d2c 575 struct ieee80211_sub_if_data *sdata;
453e66f2 576 struct mesh_config *mshcfg;
4efec451 577 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 578
d0709a65
JB		 579 /*
580 * This STA is valid because sta_info_destroy() will
581 * del_timer_sync() this timer after having made sure
582 * it cannot be readded (by deleting the plink.)
583 */
c3896d2c
LCC		 584 sta = (struct sta_info *) data;
585
690205f1 586 if (sta->sdata->local->quiescing)
5bb644a0 587 return;
5bb644a0 588
433f5bc1 589 spin_lock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 590
591 /* If a timer fires just before a state transition on another CPU,
592 * we may have already extended the timeout and changed state by the
593 * time we've acquired the lock and arrived here. In that case,
594 * skip this timer and wait for the new one.
595 */
433f5bc1 596 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
2b470c39
BC		 597 mpl_dbg(sta->sdata,
598 "Ignoring timer for %pM in state %s (timer adjusted)",
433f5bc1
JB		 599 sta->sta.addr, mplstates[sta->mesh->plink_state]);
600 spin_unlock_bh(&sta->mesh->plink_lock);
c3896d2c
LCC		 601 return;
602 }
2b470c39
BC		 603
604 /* del_timer() and handler may race when entering these states */
433f5bc1
JB		 605 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
606 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
2b470c39
BC		 607 mpl_dbg(sta->sdata,
608 "Ignoring timer for %pM in state %s (timer deleted)",
433f5bc1
JB		 609 sta->sta.addr, mplstates[sta->mesh->plink_state]);
610 spin_unlock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 611 return;
612 }
613
bdcbd8e0 614 mpl_dbg(sta->sdata,
3088f7d2 615 "Mesh plink timer for %pM fired on state %s\n",
433f5bc1 616 sta->sta.addr, mplstates[sta->mesh->plink_state]);
d0709a65 617 sdata = sta->sdata;
453e66f2 618 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c 619
433f5bc1 620 switch (sta->mesh->plink_state) {
57cf8043
JC		 621 case NL80211_PLINK_OPN_RCVD:
622 case NL80211_PLINK_OPN_SNT:
c3896d2c 623 /* retry timer */
433f5bc1 624 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 625 u32 rand;
bdcbd8e0
JB		 626 mpl_dbg(sta->sdata,
627 "Mesh plink for %pM (retry, timeout): %d %d\n",
433f5bc1
JB		 628 sta->sta.addr, sta->mesh->plink_retries,
629 sta->mesh->plink_timeout);
c3896d2c 630 get_random_bytes(&rand, sizeof(u32));
433f5bc1
JB		 631 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
632 rand % sta->mesh->plink_timeout;
633 ++sta->mesh->plink_retries;
634 mod_plink_timer(sta, sta->mesh->plink_timeout);
4efec451 635 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 636 break;
637 }
6f101ef0 638 reason = WLAN_REASON_MESH_MAX_RETRIES;
c3896d2c 639 /* fall through on else */
57cf8043 640 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 641 /* confirm timer */
642 if (!reason)
6f101ef0 643 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
433f5bc1 644 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
453e66f2 645 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 646 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 647 break;
57cf8043 648 case NL80211_PLINK_HOLDING:
c3896d2c 649 /* holding timer */
433f5bc1 650 del_timer(&sta->mesh->plink_timer);
c3896d2c 651 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 652 break;
653 default:
c3896d2c
LCC		 654 break;
655 }
433f5bc1 656 spin_unlock_bh(&sta->mesh->plink_lock);
4efec451 657 if (action)
a69bd8e6 658 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1 659 sta->mesh->llid, sta->mesh->plid, reason);
c3896d2c
LCC		 660}
661
0df2f6c1 662static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 663{
433f5bc1
JB		 664 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
665 sta->mesh->plink_timer.data = (unsigned long) sta;
666 sta->mesh->plink_timer.function = mesh_plink_timer;
667 sta->mesh->plink_timeout = timeout;
668 add_timer(&sta->mesh->plink_timer);
c3896d2c
LCC		 669}
670
204d1304 671static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 672 u16 llid)
204d1304
TP		 673{
674 struct ieee80211_local *local = sdata->local;
675 bool in_use = false;
676 struct sta_info *sta;
677
678 rcu_read_lock();
679 list_for_each_entry_rcu(sta, &local->sta_list, list) {
433f5bc1 680 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
204d1304
TP		 681 in_use = true;
682 break;
683 }
684 }
685 rcu_read_unlock();
686
687 return in_use;
688}
689
6f101ef0 690static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 691{
692 u16 llid;
693
694 do {
695 get_random_bytes(&llid, sizeof(llid));
6f101ef0 696 } while (llid_in_use(sdata, llid));
204d1304 697
6f101ef0 698 return llid;
204d1304
TP		 699}
700
39886b61 701u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 702{
d0709a65 703 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 704 u32 changed;
c3896d2c 705
c2c98fde 706 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 707 return 0;
53e80511 708
433f5bc1
JB		 709 spin_lock_bh(&sta->mesh->plink_lock);
710 sta->mesh->llid = mesh_get_new_llid(sdata);
711 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
712 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
713 spin_unlock_bh(&sta->mesh->plink_lock);
39886b61 714 return 0;
c3896d2c 715 }
433f5bc1 716 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 717 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
433f5bc1 718 spin_unlock_bh(&sta->mesh->plink_lock);
bdcbd8e0
JB		 719 mpl_dbg(sdata,
720 "Mesh plink: starting establishment with %pM\n",
0c68ae26 721 sta->sta.addr);
c3896d2c 722
3f52b7e3 723 /* set the non-peer mode to active during peering */
39886b61 724 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 725
a69bd8e6 726 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
433f5bc1 727 sta->sta.addr, sta->mesh->llid, 0, 0);
39886b61 728 return changed;
c3896d2c
LCC		 729}
730
39886b61 731u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 732{
df323818 733 u32 changed;
c9370197 734
433f5bc1 735 spin_lock_bh(&sta->mesh->plink_lock);
df323818 736 changed = __mesh_plink_deactivate(sta);
433f5bc1
JB		 737 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
738 spin_unlock_bh(&sta->mesh->plink_lock);
c9370197 739
39886b61 740 return changed;
c3896d2c
LCC		 741}
742
e76d67f0
BC		 743static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
744 struct sta_info *sta,
745 enum plink_event event)
746{
747 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
6f101ef0
CYY		 748 u16 reason = (event == CLS_ACPT) ?
749 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0 750
433f5bc1
JB		 751 sta->mesh->reason = reason;
752 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
272a9e26 753 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 754}
755
756static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
757 struct sta_info *sta)
758{
759 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
760 u32 changed = 0;
761
433f5bc1
JB		 762 del_timer(&sta->mesh->plink_timer);
763 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
e76d67f0
BC		 764 changed |= mesh_plink_inc_estab_count(sdata);
765 changed |= mesh_set_ht_prot_mode(sdata);
766 changed |= mesh_set_short_slot_time(sdata);
767 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
768 ieee80211_mps_sta_status_update(sta);
769 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
770 return changed;
771}
772
c7e67811
TP		 773/**
774 * mesh_plink_fsm - step @sta MPM based on @event
775 *
776 * @sdata: interface
777 * @sta: mesh neighbor
778 * @event: peering event
779 *
780 * Return: changed MBSS flags
781 */
782static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
783 struct sta_info *sta, enum plink_event event)
784{
785 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
786 enum ieee80211_self_protected_actioncode action = 0;
787 u32 changed = 0;
788
789 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
433f5bc1 790 mplstates[sta->mesh->plink_state], mplevents[event]);
c7e67811 791
433f5bc1
JB		 792 spin_lock_bh(&sta->mesh->plink_lock);
793 switch (sta->mesh->plink_state) {
c7e67811
TP		 794 case NL80211_PLINK_LISTEN:
795 switch (event) {
796 case CLS_ACPT:
797 mesh_plink_fsm_restart(sta);
798 break;
799 case OPN_ACPT:
433f5bc1
JB		 800 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
801 sta->mesh->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 802 mesh_plink_timer_set(sta,
803 mshcfg->dot11MeshRetryTimeout);
804
805 /* set the non-peer mode to active during peering */
806 changed |= ieee80211_mps_local_status_update(sdata);
807 action = WLAN_SP_MESH_PEERING_OPEN;
808 break;
809 default:
810 break;
811 }
812 break;
813 case NL80211_PLINK_OPN_SNT:
814 switch (event) {
815 case OPN_RJCT:
816 case CNF_RJCT:
817 case CLS_ACPT:
818 mesh_plink_close(sdata, sta, event);
819 action = WLAN_SP_MESH_PEERING_CLOSE;
820 break;
821 case OPN_ACPT:
822 /* retry timer is left untouched */
433f5bc1 823 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
c7e67811
TP		 824 action = WLAN_SP_MESH_PEERING_CONFIRM;
825 break;
826 case CNF_ACPT:
433f5bc1 827 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 828 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 829 break;
830 default:
831 break;
832 }
833 break;
834 case NL80211_PLINK_OPN_RCVD:
835 switch (event) {
836 case OPN_RJCT:
837 case CNF_RJCT:
838 case CLS_ACPT:
839 mesh_plink_close(sdata, sta, event);
840 action = WLAN_SP_MESH_PEERING_CLOSE;
841 break;
842 case OPN_ACPT:
843 action = WLAN_SP_MESH_PEERING_CONFIRM;
844 break;
845 case CNF_ACPT:
846 changed |= mesh_plink_establish(sdata, sta);
847 break;
848 default:
849 break;
850 }
851 break;
852 case NL80211_PLINK_CNF_RCVD:
853 switch (event) {
854 case OPN_RJCT:
855 case CNF_RJCT:
856 case CLS_ACPT:
857 mesh_plink_close(sdata, sta, event);
858 action = WLAN_SP_MESH_PEERING_CLOSE;
859 break;
860 case OPN_ACPT:
861 changed |= mesh_plink_establish(sdata, sta);
862 action = WLAN_SP_MESH_PEERING_CONFIRM;
863 break;
864 default:
865 break;
866 }
867 break;
868 case NL80211_PLINK_ESTAB:
869 switch (event) {
870 case CLS_ACPT:
871 changed |= __mesh_plink_deactivate(sta);
872 changed |= mesh_set_ht_prot_mode(sdata);
873 changed |= mesh_set_short_slot_time(sdata);
874 mesh_plink_close(sdata, sta, event);
875 action = WLAN_SP_MESH_PEERING_CLOSE;
876 break;
877 case OPN_ACPT:
878 action = WLAN_SP_MESH_PEERING_CONFIRM;
879 break;
880 default:
881 break;
882 }
883 break;
884 case NL80211_PLINK_HOLDING:
885 switch (event) {
886 case CLS_ACPT:
433f5bc1 887 del_timer(&sta->mesh->plink_timer);
c7e67811
TP		 888 mesh_plink_fsm_restart(sta);
889 break;
890 case OPN_ACPT:
891 case CNF_ACPT:
892 case OPN_RJCT:
893 case CNF_RJCT:
894 action = WLAN_SP_MESH_PEERING_CLOSE;
895 break;
896 default:
897 break;
898 }
899 break;
900 default:
901 /* should not get here, PLINK_BLOCKED is dealt with at the
902 * beginning of the function
903 */
904 break;
905 }
433f5bc1 906 spin_unlock_bh(&sta->mesh->plink_lock);
c7e67811 907 if (action) {
a69bd8e6 908 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1
JB		 909 sta->mesh->llid, sta->mesh->plid,
910 sta->mesh->reason);
c7e67811
TP		 911
912 /* also send confirm in open case */
913 if (action == WLAN_SP_MESH_PEERING_OPEN) {
a69bd8e6 914 mesh_plink_frame_tx(sdata, sta,
c7e67811 915 WLAN_SP_MESH_PEERING_CONFIRM,
433f5bc1
JB		 916 sta->sta.addr, sta->mesh->llid,
917 sta->mesh->plid, 0);
c7e67811
TP		 918 }
919 }
920
921 return changed;
922}
923
c99a89ed
TP		 924/*
925 * mesh_plink_get_event - get correct MPM event
926 *
927 * @sdata: interface
928 * @sta: peer, leave NULL if processing a frame from a new suitable peer
929 * @elems: peering management IEs
930 * @ftype: frame type
931 * @llid: peer's peer link ID
932 * @plid: peer's local link ID
933 *
934 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
935 * an error.
936 */
937static enum plink_event
938mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
939 struct sta_info *sta,
940 struct ieee802_11_elems *elems,
941 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 942 u16 llid, u16 plid)
c99a89ed
TP		 943{
944 enum plink_event event = PLINK_UNDEFINED;
945 u8 ie_len = elems->peering_len;
946 bool matches_local;
947
948 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
949 mesh_matches_local(sdata, elems));
950
951 /* deny open request from non-matching peer */
952 if (!matches_local && !sta) {
953 event = OPN_RJCT;
954 goto out;
955 }
956
957 if (!sta) {
958 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
959 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
960 goto out;
961 }
962 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
963 if (!mesh_plink_free_count(sdata)) {
964 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
965 goto out;
966 }
967 } else {
968 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
969 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
970 goto out;
971 }
433f5bc1 972 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
c99a89ed
TP		 973 goto out;
974 }
975
976 /* new matching peer */
977 if (!sta) {
978 event = OPN_ACPT;
979 goto out;
980 }
981
982 switch (ftype) {
983 case WLAN_SP_MESH_PEERING_OPEN:
984 if (!matches_local)
985 event = OPN_RJCT;
986 if (!mesh_plink_free_count(sdata) ||
433f5bc1 987 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 988 event = OPN_IGNR;
989 else
990 event = OPN_ACPT;
991 break;
992 case WLAN_SP_MESH_PEERING_CONFIRM:
993 if (!matches_local)
994 event = CNF_RJCT;
995 if (!mesh_plink_free_count(sdata) ||
433f5bc1
JB		 996 sta->mesh->llid != llid ||
997 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 998 event = CNF_IGNR;
999 else
1000 event = CNF_ACPT;
1001 break;
1002 case WLAN_SP_MESH_PEERING_CLOSE:
433f5bc1 1003 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
c99a89ed
TP		 1004 /* Do not check for llid or plid. This does not
1005 * follow the standard but since multiple plinks
1006 * per sta are not supported, it is necessary in
1007 * order to avoid a livelock when MP A sees an
1008 * establish peer link to MP B but MP B does not
1009 * see it. This can be caused by a timeout in
1010 * B's peer link establishment or B beign
1011 * restarted.
1012 */
1013 event = CLS_ACPT;
433f5bc1 1014 else if (sta->mesh->plid != plid)
c99a89ed 1015 event = CLS_IGNR;
433f5bc1 1016 else if (ie_len == 8 && sta->mesh->llid != llid)
c99a89ed
TP		 1017 event = CLS_IGNR;
1018 else
1019 event = CLS_ACPT;
1020 break;
1021 default:
1022 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1023 break;
1024 }
1025
1026out:
1027 return event;
1028}
1029
05a23ae9
TP		 1030static void
1031mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1032 struct ieee80211_mgmt *mgmt,
1033 struct ieee802_11_elems *elems)
c3896d2c 1034{
05a23ae9 1035
c3896d2c
LCC		 1036 struct sta_info *sta;
1037 enum plink_event event;
54ef656b 1038 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 1039 u32 changed = 0;
c99a89ed 1040 u8 ie_len = elems->peering_len;
6f101ef0 1041 u16 plid, llid = 0;
c3896d2c 1042
05a23ae9 1043 if (!elems->peering) {
bdcbd8e0
JB		 1044 mpl_dbg(sdata,
1045 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1046 return;
1047 }
bf7cd94d 1048
05a23ae9 1049 if (elems->rsn_len &&
bf7cd94d 1050 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1051 mpl_dbg(sdata,
1052 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1053 return;
1054 }
c3896d2c 1055
8db09850 1056 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1057 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1058 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1059 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1060 && ie_len != 8)) {
bdcbd8e0
JB		 1061 mpl_dbg(sdata,
1062 "Mesh plink: incorrect plink ie length %d %d\n",
1063 ftype, ie_len);
c3896d2c
LCC		 1064 return;
1065 }
1066
54ef656b 1067 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1068 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1069 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1070 return;
1071 }
1072 /* Note the lines below are correct, the llid in the frame is the plid
1073 * from the point of view of this host.
1074 */
f8134fed 1075 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1076 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1077 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1078 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1079
296fcba3 1080 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1081 rcu_read_lock();
1082
abe60632 1083 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1084
55335137 1085 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1086 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1087 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1088 mgmt->sa);
fc10302e 1089 goto unlock_rcu;
55335137
AN		 1090 }
1091
c3896d2c 1092 /* Now we will figure out the appropriate event... */
c99a89ed 1093 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1094
1095 if (event == OPN_ACPT) {
296fcba3 1096 rcu_read_unlock();
54ab1ffb 1097 /* allocate sta entry if necessary and update info */
05a23ae9 1098 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
54ab1ffb 1099 if (!sta) {
bdcbd8e0 1100 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1101 goto unlock_rcu;
54ab1ffb 1102 }
433f5bc1 1103 sta->mesh->plid = plid;
c99a89ed 1104 } else if (!sta && event == OPN_RJCT) {
a69bd8e6 1105 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
c99a89ed 1106 mgmt->sa, 0, plid,
6f101ef0 1107 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1108 goto unlock_rcu;
1109 } else if (!sta || event == PLINK_UNDEFINED) {
1110 /* something went wrong */
1111 goto unlock_rcu;
c3896d2c
LCC		 1112 }
1113
a69bd8e6
BC		 1114 if (event == CNF_ACPT) {
1115 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
0e0060fc 1116 if (!sta->mesh->plid)
a69bd8e6 1117 sta->mesh->plid = plid;
a69bd8e6
BC		 1118
1119 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1120 }
6c6fa496 1121
c7e67811 1122 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1123
fc10302e 1124unlock_rcu:
d0709a65 1125 rcu_read_unlock();
57aac7c5 1126
ecccd072 1127 if (changed)
2b5e1967 1128 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1129}
05a23ae9
TP		 1130
1131void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1132 struct ieee80211_mgmt *mgmt, size_t len,
1133 struct ieee80211_rx_status *rx_status)
1134{
1135 struct ieee802_11_elems elems;
1136 size_t baselen;
1137 u8 *baseaddr;
1138
1139 /* need action_code, aux */
1140 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1141 return;
1142
1143 if (sdata->u.mesh.user_mpm)
1144 /* userspace must register for these */
1145 return;
1146
1147 if (is_multicast_ether_addr(mgmt->da)) {
1148 mpl_dbg(sdata,
1149 "Mesh plink: ignore frame from multicast address\n");
1150 return;
1151 }
1152
1153 baseaddr = mgmt->u.action.u.self_prot.variable;
1154 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1155 if (mgmt->u.action.u.self_prot.action_code ==
1156 WLAN_SP_MESH_PEERING_CONFIRM) {
1157 baseaddr += 4;
1158 baselen += 4;
b3e7de87
BC		 1159
1160 if (baselen > len)
1161 return;
05a23ae9
TP		 1162 }
1163 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1164 mesh_process_plink_frame(sdata, mgmt, &elems);
1165}
Linux kernel - Deliverables
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