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mac80211: move beacon_loss_count into ifmgd
[linux-2.6-block.git] / net / mac80211 / mesh_plink.c
CommitLineData
c3896d2c 1/*
264d9b7d 2 * Copyright (c) 2008, 2009 open80211s Ltd.
c3896d2c
LCC		 3 * Author: Luis Carlos Cobo <luisca@cozybit.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
5a0e3ad6 9#include <linux/gfp.h>
902acc78
JB		 10#include <linux/kernel.h>
11#include <linux/random.h>
c3896d2c 12#include "ieee80211_i.h"
2c8dccc7 13#include "rate.h"
c3896d2c 14#include "mesh.h"
c3896d2c 15
a69bd8e6 16#define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
8db09850
TP		 17#define PLINK_GET_LLID(p) (p + 2)
18#define PLINK_GET_PLID(p) (p + 4)
c3896d2c 19
433f5bc1 20#define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
cc57ac53 21 jiffies + msecs_to_jiffies(t)))
c3896d2c 22
c3896d2c
LCC		 23enum plink_event {
24 PLINK_UNDEFINED,
25 OPN_ACPT,
26 OPN_RJCT,
27 OPN_IGNR,
28 CNF_ACPT,
29 CNF_RJCT,
30 CNF_IGNR,
31 CLS_ACPT,
32 CLS_IGNR
33};
34
95e48add
TP		 35static const char * const mplstates[] = {
36 [NL80211_PLINK_LISTEN] = "LISTEN",
37 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
38 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
39 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
40 [NL80211_PLINK_ESTAB] = "ESTAB",
41 [NL80211_PLINK_HOLDING] = "HOLDING",
42 [NL80211_PLINK_BLOCKED] = "BLOCKED"
43};
44
45static const char * const mplevents[] = {
46 [PLINK_UNDEFINED] = "NONE",
47 [OPN_ACPT] = "OPN_ACPT",
48 [OPN_RJCT] = "OPN_RJCT",
49 [OPN_IGNR] = "OPN_IGNR",
50 [CNF_ACPT] = "CNF_ACPT",
51 [CNF_RJCT] = "CNF_RJCT",
52 [CNF_IGNR] = "CNF_IGNR",
53 [CLS_ACPT] = "CLS_ACPT",
54 [CLS_IGNR] = "CLS_IGNR"
55};
56
36c9bb29
BC		 57/* We only need a valid sta if user configured a minimum rssi_threshold. */
58static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
59 struct sta_info *sta)
60{
61 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
62 return rssi_threshold == 0 ||
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) +
c85fb53c
BC		 229 2 + sizeof(struct ieee80211_vht_cap) +
230 2 + sizeof(struct ieee80211_vht_operation) +
3b69a9c5
TP		 231 2 + 8 + /* peering IE */
232 sdata->u.mesh.ie_len);
c3896d2c 233 if (!skb)
87d84c45 234 return err;
e7570dfb 235 info = IEEE80211_SKB_CB(skb);
65e8b0cc 236 skb_reserve(skb, local->tx_headroom);
3b69a9c5
TP		 237 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
238 memset(mgmt, 0, hdr_len);
e7827a70
HH		 239 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
240 IEEE80211_STYPE_ACTION);
c3896d2c 241 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 242 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 243 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 244 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
245 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 246
8db09850 247 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
55de908a
JB		 248 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
249
8db09850
TP		 250 /* capability info */
251 pos = skb_put(skb, 2);
252 memset(pos, 0, 2);
54ef656b 253 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 254 /* AID */
255 pos = skb_put(skb, 2);
a69bd8e6 256 put_unaligned_le16(sta->sta.aid, pos);
c3896d2c 257 }
55de908a
JB		 258 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
259 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 260 mesh_add_rsn_ie(sdata, skb) ||
261 mesh_add_meshid_ie(sdata, skb) ||
262 mesh_add_meshconf_ie(sdata, skb))
f609a43d 263 goto free;
8db09850 264 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 265 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 266 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 267 goto free;
c3896d2c
LCC		 268 }
269
8db09850 270 /* Add Mesh Peering Management element */
c3896d2c 271 switch (action) {
54ef656b 272 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 273 break;
54ef656b 274 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 275 ie_len += 2;
c3896d2c
LCC		 276 include_plid = true;
277 break;
54ef656b 278 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 279 if (plid) {
280 ie_len += 2;
c3896d2c
LCC		 281 include_plid = true;
282 }
8db09850 283 ie_len += 2; /* reason code */
c3896d2c 284 break;
8db09850 285 default:
f609a43d
TP		 286 err = -EINVAL;
287 goto free;
c3896d2c
LCC		 288 }
289
8db09850 290 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 291 goto free;
8db09850 292
c3896d2c 293 pos = skb_put(skb, 2 + ie_len);
8db09850 294 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 295 *pos++ = ie_len;
8db09850
TP		 296 memcpy(pos, &peering_proto, 2);
297 pos += 2;
6f101ef0 298 put_unaligned_le16(llid, pos);
8db09850 299 pos += 2;
c3896d2c 300 if (include_plid) {
6f101ef0 301 put_unaligned_le16(plid, pos);
8db09850 302 pos += 2;
c3896d2c 303 }
54ef656b 304 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 305 put_unaligned_le16(reason, pos);
8db09850 306 pos += 2;
c3896d2c 307 }
176f3608
TP		 308
309 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d 310 if (mesh_add_ht_cap_ie(sdata, skb) ||
c85fb53c
BC		 311 mesh_add_ht_oper_ie(sdata, skb) ||
312 mesh_add_vht_cap_ie(sdata, skb) ||
313 mesh_add_vht_oper_ie(sdata, skb))
f609a43d 314 goto free;
176f3608
TP		 315 }
316
bf7cd94d 317 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 318 goto free;
c3896d2c 319
62ae67be 320 ieee80211_tx_skb(sdata, skb);
c3896d2c 321 return 0;
f609a43d
TP		 322free:
323 kfree_skb(skb);
324 return err;
c3896d2c
LCC		 325}
326
fa87a656
BC		 327/**
328 * __mesh_plink_deactivate - deactivate mesh peer link
329 *
330 * @sta: mesh peer link to deactivate
331 *
332 * All mesh paths with this peer as next hop will be flushed
333 * Returns beacon changed flag if the beacon content changed.
334 *
335 * Locking: the caller must hold sta->mesh->plink_lock
336 */
337static u32 __mesh_plink_deactivate(struct sta_info *sta)
338{
339 struct ieee80211_sub_if_data *sdata = sta->sdata;
340 u32 changed = 0;
341
342 lockdep_assert_held(&sta->mesh->plink_lock);
343
344 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
345 changed = mesh_plink_dec_estab_count(sdata);
346 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
347 mesh_path_flush_by_nexthop(sta);
348
349 ieee80211_mps_sta_status_update(sta);
350 changed |= ieee80211_mps_set_sta_local_pm(sta,
351 NL80211_MESH_POWER_UNKNOWN);
352
353 return changed;
354}
355
356/**
357 * mesh_plink_deactivate - deactivate mesh peer link
358 *
359 * @sta: mesh peer link to deactivate
360 *
361 * All mesh paths with this peer as next hop will be flushed
362 */
363u32 mesh_plink_deactivate(struct sta_info *sta)
364{
365 struct ieee80211_sub_if_data *sdata = sta->sdata;
366 u32 changed;
367
368 spin_lock_bh(&sta->mesh->plink_lock);
369 changed = __mesh_plink_deactivate(sta);
370 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
a69bd8e6 371 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
fa87a656
BC		 372 sta->sta.addr, sta->mesh->llid, sta->mesh->plid,
373 sta->mesh->reason);
374 spin_unlock_bh(&sta->mesh->plink_lock);
375
376 return changed;
377}
378
296fcba3
TP		 379static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
380 struct sta_info *sta,
381 struct ieee802_11_elems *elems, bool insert)
c3896d2c 382{
f698d856 383 struct ieee80211_local *local = sdata->local;
55de908a 384 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
54ab1ffb 385 struct ieee80211_supported_band *sband;
f68d776a 386 u32 rates, basic_rates = 0, changed = 0;
abcff6ef 387 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
c3896d2c 388
f743ff49 389 sband = local->hw.wiphy->bands[band];
2103dec1 390 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
d0709a65 391
433f5bc1 392 spin_lock_bh(&sta->mesh->plink_lock);
c3896d2c 393 sta->last_rx = jiffies;
296fcba3
TP		 394
395 /* rates and capabilities don't change during peering */
433f5bc1
JB		 396 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
397 sta->mesh->processed_beacon)
296fcba3 398 goto out;
433f5bc1 399 sta->mesh->processed_beacon = true;
bae35d92 400
f68d776a
TP		 401 if (sta->sta.supp_rates[band] != rates)
402 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
f743ff49 403 sta->sta.supp_rates[band] = rates;
54ab1ffb 404
52ac8c48
TP		 405 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
406 elems->ht_cap_elem, sta))
407 changed |= IEEE80211_RC_BW_CHANGED;
4bf88530 408
c85fb53c
BC		 409 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
410 elems->vht_cap_elem, sta);
411
abcff6ef
JD		 412 if (bw != sta->sta.bandwidth)
413 changed |= IEEE80211_RC_BW_CHANGED;
414
52ac8c48
TP		 415 /* HT peer is operating 20MHz-only */
416 if (elems->ht_operation &&
417 !(elems->ht_operation->ht_param &
418 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
419 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
f68d776a 420 changed |= IEEE80211_RC_BW_CHANGED;
52ac8c48 421 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
57aac7c5 422 }
c7d25828 423
59cf1d65
HS		 424 if (insert)
425 rate_control_rate_init(sta);
f68d776a
TP		 426 else
427 rate_control_rate_update(local, sband, sta, changed);
296fcba3 428out:
433f5bc1 429 spin_unlock_bh(&sta->mesh->plink_lock);
296fcba3
TP		 430}
431
0e0060fc
BC		 432static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
433{
434 struct sta_info *sta;
435 unsigned long *aid_map;
436 int aid;
437
438 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
439 sizeof(*aid_map), GFP_KERNEL);
440 if (!aid_map)
441 return -ENOMEM;
442
443 /* reserve aid 0 for mcast indication */
444 __set_bit(0, aid_map);
445
446 rcu_read_lock();
447 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
448 __set_bit(sta->sta.aid, aid_map);
449 rcu_read_unlock();
450
451 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
452 kfree(aid_map);
453
454 if (aid > IEEE80211_MAX_AID)
455 return -ENOBUFS;
456
457 return aid;
458}
459
296fcba3
TP		 460static struct sta_info *
461__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
462{
463 struct sta_info *sta;
0e0060fc 464 int aid;
54ab1ffb 465
296fcba3 466 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 467 return NULL;
468
0e0060fc
BC		 469 aid = mesh_allocate_aid(sdata);
470 if (aid < 0)
471 return NULL;
472
296fcba3
TP		 473 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
474 if (!sta)
475 return NULL;
476
433f5bc1 477 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 478 sta->sta.wme = true;
0e0060fc 479 sta->sta.aid = aid;
296fcba3
TP		 480
481 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
482 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
483 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
484
296fcba3
TP		 485 return sta;
486}
487
488static struct sta_info *
489mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
490 struct ieee802_11_elems *elems)
491{
492 struct sta_info *sta = NULL;
493
a6dad6a2
TP		 494 /* Userspace handles station allocation */
495 if (sdata->u.mesh.user_mpm ||
496 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
296fcba3
TP		 497 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
498 elems->ie_start,
499 elems->total_len,
500 GFP_KERNEL);
501 else
502 sta = __mesh_sta_info_alloc(sdata, addr);
503
54ab1ffb
TP		 504 return sta;
505}
506
296fcba3
TP		 507/*
508 * mesh_sta_info_get - return mesh sta info entry for @addr.
509 *
510 * @sdata: local meshif
511 * @addr: peer's address
512 * @elems: IEs from beacon or mesh peering frame.
513 *
514 * Return existing or newly allocated sta_info under RCU read lock.
515 * (re)initialize with given IEs.
516 */
517static struct sta_info *
518mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
519 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
520{
521 struct sta_info *sta = NULL;
522
523 rcu_read_lock();
524 sta = sta_info_get(sdata, addr);
525 if (sta) {
526 mesh_sta_info_init(sdata, sta, elems, false);
527 } else {
528 rcu_read_unlock();
529 /* can't run atomic */
530 sta = mesh_sta_info_alloc(sdata, addr, elems);
531 if (!sta) {
532 rcu_read_lock();
533 return NULL;
534 }
535
3b4797bc
TP		 536 mesh_sta_info_init(sdata, sta, elems, true);
537
296fcba3
TP		 538 if (sta_info_insert_rcu(sta))
539 return NULL;
540 }
541
542 return sta;
543}
544
545/*
546 * mesh_neighbour_update - update or initialize new mesh neighbor.
547 *
548 * @sdata: local meshif
549 * @addr: peer's address
550 * @elems: IEs from beacon or mesh peering frame
551 *
552 * Initiates peering if appropriate.
553 */
f743ff49
TP		 554void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
555 u8 *hw_addr,
54ab1ffb
TP		 556 struct ieee802_11_elems *elems)
557{
558 struct sta_info *sta;
39886b61 559 u32 changed = 0;
54ab1ffb 560
296fcba3 561 sta = mesh_sta_info_get(sdata, hw_addr, elems);
54ab1ffb
TP		 562 if (!sta)
563 goto out;
564
1570ca59 565 if (mesh_peer_accepts_plinks(elems) &&
433f5bc1 566 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
54ab1ffb
TP		 567 sdata->u.mesh.accepting_plinks &&
568 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 569 rssi_threshold_check(sdata, sta))
39886b61 570 changed = mesh_plink_open(sta);
c3896d2c 571
3f52b7e3 572 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 573out:
d0709a65 574 rcu_read_unlock();
2b5e1967 575 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 576}
577
578static void mesh_plink_timer(unsigned long data)
579{
580 struct sta_info *sta;
6f101ef0 581 u16 reason = 0;
c3896d2c 582 struct ieee80211_sub_if_data *sdata;
453e66f2 583 struct mesh_config *mshcfg;
4efec451 584 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 585
d0709a65
JB		 586 /*
587 * This STA is valid because sta_info_destroy() will
588 * del_timer_sync() this timer after having made sure
589 * it cannot be readded (by deleting the plink.)
590 */
c3896d2c
LCC		 591 sta = (struct sta_info *) data;
592
690205f1 593 if (sta->sdata->local->quiescing)
5bb644a0 594 return;
5bb644a0 595
433f5bc1 596 spin_lock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 597
598 /* If a timer fires just before a state transition on another CPU,
599 * we may have already extended the timeout and changed state by the
600 * time we've acquired the lock and arrived here. In that case,
601 * skip this timer and wait for the new one.
602 */
433f5bc1 603 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
2b470c39
BC		 604 mpl_dbg(sta->sdata,
605 "Ignoring timer for %pM in state %s (timer adjusted)",
433f5bc1
JB		 606 sta->sta.addr, mplstates[sta->mesh->plink_state]);
607 spin_unlock_bh(&sta->mesh->plink_lock);
c3896d2c
LCC		 608 return;
609 }
2b470c39
BC		 610
611 /* del_timer() and handler may race when entering these states */
433f5bc1
JB		 612 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
613 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
2b470c39
BC		 614 mpl_dbg(sta->sdata,
615 "Ignoring timer for %pM in state %s (timer deleted)",
433f5bc1
JB		 616 sta->sta.addr, mplstates[sta->mesh->plink_state]);
617 spin_unlock_bh(&sta->mesh->plink_lock);
2b470c39
BC		 618 return;
619 }
620
bdcbd8e0 621 mpl_dbg(sta->sdata,
3088f7d2 622 "Mesh plink timer for %pM fired on state %s\n",
433f5bc1 623 sta->sta.addr, mplstates[sta->mesh->plink_state]);
d0709a65 624 sdata = sta->sdata;
453e66f2 625 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c 626
433f5bc1 627 switch (sta->mesh->plink_state) {
57cf8043
JC		 628 case NL80211_PLINK_OPN_RCVD:
629 case NL80211_PLINK_OPN_SNT:
c3896d2c 630 /* retry timer */
433f5bc1 631 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 632 u32 rand;
bdcbd8e0
JB		 633 mpl_dbg(sta->sdata,
634 "Mesh plink for %pM (retry, timeout): %d %d\n",
433f5bc1
JB		 635 sta->sta.addr, sta->mesh->plink_retries,
636 sta->mesh->plink_timeout);
c3896d2c 637 get_random_bytes(&rand, sizeof(u32));
433f5bc1
JB		 638 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
639 rand % sta->mesh->plink_timeout;
640 ++sta->mesh->plink_retries;
641 mod_plink_timer(sta, sta->mesh->plink_timeout);
4efec451 642 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 643 break;
644 }
6f101ef0 645 reason = WLAN_REASON_MESH_MAX_RETRIES;
c3896d2c 646 /* fall through on else */
57cf8043 647 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 648 /* confirm timer */
649 if (!reason)
6f101ef0 650 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
433f5bc1 651 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
453e66f2 652 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 653 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 654 break;
57cf8043 655 case NL80211_PLINK_HOLDING:
c3896d2c 656 /* holding timer */
433f5bc1 657 del_timer(&sta->mesh->plink_timer);
c3896d2c 658 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 659 break;
660 default:
c3896d2c
LCC		 661 break;
662 }
433f5bc1 663 spin_unlock_bh(&sta->mesh->plink_lock);
4efec451 664 if (action)
a69bd8e6 665 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1 666 sta->mesh->llid, sta->mesh->plid, reason);
c3896d2c
LCC		 667}
668
0df2f6c1 669static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 670{
433f5bc1
JB		 671 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
672 sta->mesh->plink_timer.data = (unsigned long) sta;
673 sta->mesh->plink_timer.function = mesh_plink_timer;
674 sta->mesh->plink_timeout = timeout;
675 add_timer(&sta->mesh->plink_timer);
c3896d2c
LCC		 676}
677
204d1304 678static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 679 u16 llid)
204d1304
TP		 680{
681 struct ieee80211_local *local = sdata->local;
682 bool in_use = false;
683 struct sta_info *sta;
684
685 rcu_read_lock();
686 list_for_each_entry_rcu(sta, &local->sta_list, list) {
433f5bc1 687 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
204d1304
TP		 688 in_use = true;
689 break;
690 }
691 }
692 rcu_read_unlock();
693
694 return in_use;
695}
696
6f101ef0 697static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 698{
699 u16 llid;
700
701 do {
702 get_random_bytes(&llid, sizeof(llid));
6f101ef0 703 } while (llid_in_use(sdata, llid));
204d1304 704
6f101ef0 705 return llid;
204d1304
TP		 706}
707
39886b61 708u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 709{
d0709a65 710 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 711 u32 changed;
c3896d2c 712
c2c98fde 713 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 714 return 0;
53e80511 715
433f5bc1
JB		 716 spin_lock_bh(&sta->mesh->plink_lock);
717 sta->mesh->llid = mesh_get_new_llid(sdata);
718 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
719 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
720 spin_unlock_bh(&sta->mesh->plink_lock);
39886b61 721 return 0;
c3896d2c 722 }
433f5bc1 723 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 724 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
433f5bc1 725 spin_unlock_bh(&sta->mesh->plink_lock);
bdcbd8e0
JB		 726 mpl_dbg(sdata,
727 "Mesh plink: starting establishment with %pM\n",
0c68ae26 728 sta->sta.addr);
c3896d2c 729
3f52b7e3 730 /* set the non-peer mode to active during peering */
39886b61 731 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 732
a69bd8e6 733 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
433f5bc1 734 sta->sta.addr, sta->mesh->llid, 0, 0);
39886b61 735 return changed;
c3896d2c
LCC		 736}
737
39886b61 738u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 739{
df323818 740 u32 changed;
c9370197 741
433f5bc1 742 spin_lock_bh(&sta->mesh->plink_lock);
df323818 743 changed = __mesh_plink_deactivate(sta);
433f5bc1
JB		 744 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
745 spin_unlock_bh(&sta->mesh->plink_lock);
c9370197 746
39886b61 747 return changed;
c3896d2c
LCC		 748}
749
e76d67f0
BC		 750static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
751 struct sta_info *sta,
752 enum plink_event event)
753{
754 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
6f101ef0
CYY		 755 u16 reason = (event == CLS_ACPT) ?
756 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0 757
433f5bc1
JB		 758 sta->mesh->reason = reason;
759 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
272a9e26 760 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 761}
762
763static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
764 struct sta_info *sta)
765{
766 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
767 u32 changed = 0;
768
433f5bc1
JB		 769 del_timer(&sta->mesh->plink_timer);
770 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
e76d67f0
BC		 771 changed |= mesh_plink_inc_estab_count(sdata);
772 changed |= mesh_set_ht_prot_mode(sdata);
773 changed |= mesh_set_short_slot_time(sdata);
774 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
775 ieee80211_mps_sta_status_update(sta);
776 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
777 return changed;
778}
779
c7e67811
TP		 780/**
781 * mesh_plink_fsm - step @sta MPM based on @event
782 *
783 * @sdata: interface
784 * @sta: mesh neighbor
785 * @event: peering event
786 *
787 * Return: changed MBSS flags
788 */
789static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
790 struct sta_info *sta, enum plink_event event)
791{
792 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
793 enum ieee80211_self_protected_actioncode action = 0;
794 u32 changed = 0;
795
796 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
433f5bc1 797 mplstates[sta->mesh->plink_state], mplevents[event]);
c7e67811 798
433f5bc1
JB		 799 spin_lock_bh(&sta->mesh->plink_lock);
800 switch (sta->mesh->plink_state) {
c7e67811
TP		 801 case NL80211_PLINK_LISTEN:
802 switch (event) {
803 case CLS_ACPT:
804 mesh_plink_fsm_restart(sta);
805 break;
806 case OPN_ACPT:
433f5bc1
JB		 807 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
808 sta->mesh->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 809 mesh_plink_timer_set(sta,
810 mshcfg->dot11MeshRetryTimeout);
811
812 /* set the non-peer mode to active during peering */
813 changed |= ieee80211_mps_local_status_update(sdata);
814 action = WLAN_SP_MESH_PEERING_OPEN;
815 break;
816 default:
817 break;
818 }
819 break;
820 case NL80211_PLINK_OPN_SNT:
821 switch (event) {
822 case OPN_RJCT:
823 case CNF_RJCT:
824 case CLS_ACPT:
825 mesh_plink_close(sdata, sta, event);
826 action = WLAN_SP_MESH_PEERING_CLOSE;
827 break;
828 case OPN_ACPT:
829 /* retry timer is left untouched */
433f5bc1 830 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
c7e67811
TP		 831 action = WLAN_SP_MESH_PEERING_CONFIRM;
832 break;
833 case CNF_ACPT:
433f5bc1 834 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 835 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 836 break;
837 default:
838 break;
839 }
840 break;
841 case NL80211_PLINK_OPN_RCVD:
842 switch (event) {
843 case OPN_RJCT:
844 case CNF_RJCT:
845 case CLS_ACPT:
846 mesh_plink_close(sdata, sta, event);
847 action = WLAN_SP_MESH_PEERING_CLOSE;
848 break;
849 case OPN_ACPT:
850 action = WLAN_SP_MESH_PEERING_CONFIRM;
851 break;
852 case CNF_ACPT:
853 changed |= mesh_plink_establish(sdata, sta);
854 break;
855 default:
856 break;
857 }
858 break;
859 case NL80211_PLINK_CNF_RCVD:
860 switch (event) {
861 case OPN_RJCT:
862 case CNF_RJCT:
863 case CLS_ACPT:
864 mesh_plink_close(sdata, sta, event);
865 action = WLAN_SP_MESH_PEERING_CLOSE;
866 break;
867 case OPN_ACPT:
868 changed |= mesh_plink_establish(sdata, sta);
869 action = WLAN_SP_MESH_PEERING_CONFIRM;
870 break;
871 default:
872 break;
873 }
874 break;
875 case NL80211_PLINK_ESTAB:
876 switch (event) {
877 case CLS_ACPT:
878 changed |= __mesh_plink_deactivate(sta);
879 changed |= mesh_set_ht_prot_mode(sdata);
880 changed |= mesh_set_short_slot_time(sdata);
881 mesh_plink_close(sdata, sta, event);
882 action = WLAN_SP_MESH_PEERING_CLOSE;
883 break;
884 case OPN_ACPT:
885 action = WLAN_SP_MESH_PEERING_CONFIRM;
886 break;
887 default:
888 break;
889 }
890 break;
891 case NL80211_PLINK_HOLDING:
892 switch (event) {
893 case CLS_ACPT:
433f5bc1 894 del_timer(&sta->mesh->plink_timer);
c7e67811
TP		 895 mesh_plink_fsm_restart(sta);
896 break;
897 case OPN_ACPT:
898 case CNF_ACPT:
899 case OPN_RJCT:
900 case CNF_RJCT:
901 action = WLAN_SP_MESH_PEERING_CLOSE;
902 break;
903 default:
904 break;
905 }
906 break;
907 default:
908 /* should not get here, PLINK_BLOCKED is dealt with at the
909 * beginning of the function
910 */
911 break;
912 }
433f5bc1 913 spin_unlock_bh(&sta->mesh->plink_lock);
c7e67811 914 if (action) {
a69bd8e6 915 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
433f5bc1
JB		 916 sta->mesh->llid, sta->mesh->plid,
917 sta->mesh->reason);
c7e67811
TP		 918
919 /* also send confirm in open case */
920 if (action == WLAN_SP_MESH_PEERING_OPEN) {
a69bd8e6 921 mesh_plink_frame_tx(sdata, sta,
c7e67811 922 WLAN_SP_MESH_PEERING_CONFIRM,
433f5bc1
JB		 923 sta->sta.addr, sta->mesh->llid,
924 sta->mesh->plid, 0);
c7e67811
TP		 925 }
926 }
927
928 return changed;
929}
930
c99a89ed
TP		 931/*
932 * mesh_plink_get_event - get correct MPM event
933 *
934 * @sdata: interface
935 * @sta: peer, leave NULL if processing a frame from a new suitable peer
936 * @elems: peering management IEs
937 * @ftype: frame type
938 * @llid: peer's peer link ID
939 * @plid: peer's local link ID
940 *
941 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
942 * an error.
943 */
944static enum plink_event
945mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
946 struct sta_info *sta,
947 struct ieee802_11_elems *elems,
948 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 949 u16 llid, u16 plid)
c99a89ed
TP		 950{
951 enum plink_event event = PLINK_UNDEFINED;
952 u8 ie_len = elems->peering_len;
953 bool matches_local;
954
955 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
956 mesh_matches_local(sdata, elems));
957
958 /* deny open request from non-matching peer */
959 if (!matches_local && !sta) {
960 event = OPN_RJCT;
961 goto out;
962 }
963
964 if (!sta) {
965 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
966 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
967 goto out;
968 }
969 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
970 if (!mesh_plink_free_count(sdata)) {
971 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
972 goto out;
973 }
974 } else {
975 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
976 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
977 goto out;
978 }
433f5bc1 979 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
c99a89ed
TP		 980 goto out;
981 }
982
983 /* new matching peer */
984 if (!sta) {
985 event = OPN_ACPT;
986 goto out;
987 }
988
989 switch (ftype) {
990 case WLAN_SP_MESH_PEERING_OPEN:
991 if (!matches_local)
992 event = OPN_RJCT;
993 if (!mesh_plink_free_count(sdata) ||
433f5bc1 994 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 995 event = OPN_IGNR;
996 else
997 event = OPN_ACPT;
998 break;
999 case WLAN_SP_MESH_PEERING_CONFIRM:
1000 if (!matches_local)
1001 event = CNF_RJCT;
1002 if (!mesh_plink_free_count(sdata) ||
433f5bc1
JB		 1003 sta->mesh->llid != llid ||
1004 (sta->mesh->plid && sta->mesh->plid != plid))
c99a89ed
TP		 1005 event = CNF_IGNR;
1006 else
1007 event = CNF_ACPT;
1008 break;
1009 case WLAN_SP_MESH_PEERING_CLOSE:
433f5bc1 1010 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
c99a89ed
TP		 1011 /* Do not check for llid or plid. This does not
1012 * follow the standard but since multiple plinks
1013 * per sta are not supported, it is necessary in
1014 * order to avoid a livelock when MP A sees an
1015 * establish peer link to MP B but MP B does not
1016 * see it. This can be caused by a timeout in
1017 * B's peer link establishment or B beign
1018 * restarted.
1019 */
1020 event = CLS_ACPT;
433f5bc1 1021 else if (sta->mesh->plid != plid)
c99a89ed 1022 event = CLS_IGNR;
433f5bc1 1023 else if (ie_len == 8 && sta->mesh->llid != llid)
c99a89ed
TP		 1024 event = CLS_IGNR;
1025 else
1026 event = CLS_ACPT;
1027 break;
1028 default:
1029 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1030 break;
1031 }
1032
1033out:
1034 return event;
1035}
1036
05a23ae9
TP		 1037static void
1038mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1039 struct ieee80211_mgmt *mgmt,
1040 struct ieee802_11_elems *elems)
c3896d2c 1041{
05a23ae9 1042
c3896d2c
LCC		 1043 struct sta_info *sta;
1044 enum plink_event event;
54ef656b 1045 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 1046 u32 changed = 0;
c99a89ed 1047 u8 ie_len = elems->peering_len;
6f101ef0 1048 u16 plid, llid = 0;
c3896d2c 1049
05a23ae9 1050 if (!elems->peering) {
bdcbd8e0
JB		 1051 mpl_dbg(sdata,
1052 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1053 return;
1054 }
bf7cd94d 1055
05a23ae9 1056 if (elems->rsn_len &&
bf7cd94d 1057 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1058 mpl_dbg(sdata,
1059 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1060 return;
1061 }
c3896d2c 1062
8db09850 1063 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1064 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1065 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1066 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1067 && ie_len != 8)) {
bdcbd8e0
JB		 1068 mpl_dbg(sdata,
1069 "Mesh plink: incorrect plink ie length %d %d\n",
1070 ftype, ie_len);
c3896d2c
LCC		 1071 return;
1072 }
1073
54ef656b 1074 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1075 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1076 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1077 return;
1078 }
1079 /* Note the lines below are correct, the llid in the frame is the plid
1080 * from the point of view of this host.
1081 */
f8134fed 1082 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1083 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1084 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1085 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1086
296fcba3 1087 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1088 rcu_read_lock();
1089
abe60632 1090 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1091
55335137 1092 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1093 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1094 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1095 mgmt->sa);
fc10302e 1096 goto unlock_rcu;
55335137
AN		 1097 }
1098
c3896d2c 1099 /* Now we will figure out the appropriate event... */
c99a89ed 1100 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1101
1102 if (event == OPN_ACPT) {
296fcba3 1103 rcu_read_unlock();
54ab1ffb 1104 /* allocate sta entry if necessary and update info */
05a23ae9 1105 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
54ab1ffb 1106 if (!sta) {
bdcbd8e0 1107 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1108 goto unlock_rcu;
54ab1ffb 1109 }
433f5bc1 1110 sta->mesh->plid = plid;
c99a89ed 1111 } else if (!sta && event == OPN_RJCT) {
a69bd8e6 1112 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
c99a89ed 1113 mgmt->sa, 0, plid,
6f101ef0 1114 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1115 goto unlock_rcu;
1116 } else if (!sta || event == PLINK_UNDEFINED) {
1117 /* something went wrong */
1118 goto unlock_rcu;
c3896d2c
LCC		 1119 }
1120
a69bd8e6
BC		 1121 if (event == CNF_ACPT) {
1122 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
0e0060fc 1123 if (!sta->mesh->plid)
a69bd8e6 1124 sta->mesh->plid = plid;
a69bd8e6
BC		 1125
1126 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1127 }
6c6fa496 1128
c7e67811 1129 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1130
fc10302e 1131unlock_rcu:
d0709a65 1132 rcu_read_unlock();
57aac7c5 1133
ecccd072 1134 if (changed)
2b5e1967 1135 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1136}
05a23ae9
TP		 1137
1138void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1139 struct ieee80211_mgmt *mgmt, size_t len,
1140 struct ieee80211_rx_status *rx_status)
1141{
1142 struct ieee802_11_elems elems;
1143 size_t baselen;
1144 u8 *baseaddr;
1145
1146 /* need action_code, aux */
1147 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1148 return;
1149
1150 if (sdata->u.mesh.user_mpm)
1151 /* userspace must register for these */
1152 return;
1153
1154 if (is_multicast_ether_addr(mgmt->da)) {
1155 mpl_dbg(sdata,
1156 "Mesh plink: ignore frame from multicast address\n");
1157 return;
1158 }
1159
1160 baseaddr = mgmt->u.action.u.self_prot.variable;
1161 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1162 if (mgmt->u.action.u.self_prot.action_code ==
1163 WLAN_SP_MESH_PEERING_CONFIRM) {
1164 baseaddr += 4;
1165 baselen += 4;
b3e7de87
BC		 1166
1167 if (baselen > len)
1168 return;
05a23ae9
TP		 1169 }
1170 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1171 mesh_process_plink_frame(sdata, mgmt, &elems);
1172}
Linux 6.x block layer and io_uring tree(s)