projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'for-davem' into for-next
[deliverable/linux.git] / net / mac80211 / mesh_plink.c
CommitLineData
c3896d2c 1/*
264d9b7d 2 * Copyright (c) 2008, 2009 open80211s Ltd.
c3896d2c
LCC		 3 * Author: Luis Carlos Cobo <luisca@cozybit.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
5a0e3ad6 9#include <linux/gfp.h>
902acc78
JB		 10#include <linux/kernel.h>
11#include <linux/random.h>
c3896d2c 12#include "ieee80211_i.h"
2c8dccc7 13#include "rate.h"
c3896d2c 14#include "mesh.h"
c3896d2c 15
8db09850
TP		 16#define PLINK_GET_LLID(p) (p + 2)
17#define PLINK_GET_PLID(p) (p + 4)
c3896d2c
LCC		 18
19#define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
cc57ac53 20 jiffies + msecs_to_jiffies(t)))
c3896d2c 21
c3896d2c
LCC		 22enum plink_event {
23 PLINK_UNDEFINED,
24 OPN_ACPT,
25 OPN_RJCT,
26 OPN_IGNR,
27 CNF_ACPT,
28 CNF_RJCT,
29 CNF_IGNR,
30 CLS_ACPT,
31 CLS_IGNR
32};
33
95e48add
TP		 34static const char * const mplstates[] = {
35 [NL80211_PLINK_LISTEN] = "LISTEN",
36 [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
37 [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
38 [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
39 [NL80211_PLINK_ESTAB] = "ESTAB",
40 [NL80211_PLINK_HOLDING] = "HOLDING",
41 [NL80211_PLINK_BLOCKED] = "BLOCKED"
42};
43
44static const char * const mplevents[] = {
45 [PLINK_UNDEFINED] = "NONE",
46 [OPN_ACPT] = "OPN_ACPT",
47 [OPN_RJCT] = "OPN_RJCT",
48 [OPN_IGNR] = "OPN_IGNR",
49 [CNF_ACPT] = "CNF_ACPT",
50 [CNF_RJCT] = "CNF_RJCT",
51 [CNF_IGNR] = "CNF_IGNR",
52 [CLS_ACPT] = "CLS_ACPT",
53 [CLS_IGNR] = "CLS_IGNR"
54};
55
ba4a14e1 56static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
bf7cd94d 57 enum ieee80211_self_protected_actioncode action,
6f101ef0 58 u8 *da, u16 llid, u16 plid, u16 reason);
ba4a14e1 59
36c9bb29
BC		 60
61/* We only need a valid sta if user configured a minimum rssi_threshold. */
62static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
63 struct sta_info *sta)
64{
65 s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
66 return rssi_threshold == 0 ||
67 (sta && (s8) -ewma_read(&sta->avg_signal) > rssi_threshold);
68}
69
c3896d2c
LCC		 70/**
71 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
72 *
23c7a29c 73 * @sta: mesh peer link to restart
c3896d2c 74 *
07346f81 75 * Locking: this function must be called holding sta->lock
c3896d2c
LCC		 76 */
77static inline void mesh_plink_fsm_restart(struct sta_info *sta)
78{
57cf8043 79 sta->plink_state = NL80211_PLINK_LISTEN;
37659ff8
LCC		 80 sta->llid = sta->plid = sta->reason = 0;
81 sta->plink_retries = 0;
c3896d2c
LCC		 82}
83
3b144658
TP		 84/*
85 * mesh_set_short_slot_time - enable / disable ERP short slot time.
86 *
87 * The standard indirectly mandates mesh STAs to turn off short slot time by
88 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
89 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
90 * MBSS support ERP rates.
91 *
92 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
93 */
94static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
95{
96 struct ieee80211_local *local = sdata->local;
97 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
98 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
99 struct sta_info *sta;
100 u32 erp_rates = 0, changed = 0;
101 int i;
102 bool short_slot = false;
103
104 if (band == IEEE80211_BAND_5GHZ) {
105 /* (IEEE 802.11-2012 19.4.5) */
106 short_slot = true;
107 goto out;
108 } else if (band != IEEE80211_BAND_2GHZ ||
109 (band == IEEE80211_BAND_2GHZ &&
110 local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
111 goto out;
112
113 for (i = 0; i < sband->n_bitrates; i++)
114 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
115 erp_rates |= BIT(i);
116
117 if (!erp_rates)
118 goto out;
119
120 rcu_read_lock();
121 list_for_each_entry_rcu(sta, &local->sta_list, list) {
122 if (sdata != sta->sdata ||
123 sta->plink_state != NL80211_PLINK_ESTAB)
124 continue;
125
126 short_slot = false;
127 if (erp_rates & sta->sta.supp_rates[band])
128 short_slot = true;
129 else
130 break;
131 }
132 rcu_read_unlock();
133
134out:
135 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
136 sdata->vif.bss_conf.use_short_slot = short_slot;
137 changed = BSS_CHANGED_ERP_SLOT;
138 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
139 sdata->vif.addr, short_slot);
140 }
141 return changed;
142}
143
2c53040f 144/**
cbf9322e 145 * mesh_set_ht_prot_mode - set correct HT protection mode
57aac7c5 146 *
cbf9322e
AN		 147 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
148 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
149 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
150 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
151 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
152 * HT20 peer is present. Otherwise no-protection mode is selected.
57aac7c5
AN		 153 */
154static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
155{
156 struct ieee80211_local *local = sdata->local;
157 struct sta_info *sta;
57aac7c5
AN		 158 u16 ht_opmode;
159 bool non_ht_sta = false, ht20_sta = false;
160
0418a445
SW		 161 switch (sdata->vif.bss_conf.chandef.width) {
162 case NL80211_CHAN_WIDTH_20_NOHT:
163 case NL80211_CHAN_WIDTH_5:
164 case NL80211_CHAN_WIDTH_10:
57aac7c5 165 return 0;
0418a445
SW		 166 default:
167 break;
168 }
57aac7c5
AN		 169
170 rcu_read_lock();
171 list_for_each_entry_rcu(sta, &local->sta_list, list) {
cbf9322e
AN		 172 if (sdata != sta->sdata ||
173 sta->plink_state != NL80211_PLINK_ESTAB)
174 continue;
175
52ac8c48
TP		 176 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
177 continue;
178
179 if (!sta->sta.ht_cap.ht_supported) {
180 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
181 sta->sta.addr);
cbf9322e 182 non_ht_sta = true;
cbf9322e 183 break;
57aac7c5 184 }
52ac8c48
TP		 185
186 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
187 ht20_sta = true;
57aac7c5 188 }
57aac7c5
AN		 189 rcu_read_unlock();
190
191 if (non_ht_sta)
192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
466f310d 193 else if (ht20_sta &&
4bf88530 194 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
57aac7c5
AN		 195 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
196 else
197 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
198
52ac8c48
TP		 199 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
200 return 0;
57aac7c5 201
52ac8c48
TP		 202 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
203 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
204 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
205 return BSS_CHANGED_HT;
57aac7c5
AN		 206}
207
c3896d2c 208/**
c9370197 209 * __mesh_plink_deactivate - deactivate mesh peer link
c3896d2c
LCC		 210 *
211 * @sta: mesh peer link to deactivate
212 *
213 * All mesh paths with this peer as next hop will be flushed
df323818 214 * Returns beacon changed flag if the beacon content changed.
c3896d2c 215 *
07346f81 216 * Locking: the caller must hold sta->lock
c3896d2c 217 */
df323818 218static u32 __mesh_plink_deactivate(struct sta_info *sta)
c3896d2c 219{
d0709a65 220 struct ieee80211_sub_if_data *sdata = sta->sdata;
df323818 221 u32 changed = 0;
d0709a65 222
df323818
MP		 223 if (sta->plink_state == NL80211_PLINK_ESTAB)
224 changed = mesh_plink_dec_estab_count(sdata);
57cf8043 225 sta->plink_state = NL80211_PLINK_BLOCKED;
c3896d2c 226 mesh_path_flush_by_nexthop(sta);
c9370197 227
3f52b7e3 228 ieee80211_mps_sta_status_update(sta);
446075d7
MP		 229 changed |= ieee80211_mps_set_sta_local_pm(sta,
230 NL80211_MESH_POWER_UNKNOWN);
3f52b7e3 231
df323818 232 return changed;
c3896d2c
LCC		 233}
234
902acc78 235/**
c9370197 236 * mesh_plink_deactivate - deactivate mesh peer link
902acc78
JB		 237 *
238 * @sta: mesh peer link to deactivate
239 *
240 * All mesh paths with this peer as next hop will be flushed
241 */
45b5028e 242u32 mesh_plink_deactivate(struct sta_info *sta)
902acc78 243{
c9370197 244 struct ieee80211_sub_if_data *sdata = sta->sdata;
df323818 245 u32 changed;
c9370197 246
07346f81 247 spin_lock_bh(&sta->lock);
df323818 248 changed = __mesh_plink_deactivate(sta);
6f101ef0 249 sta->reason = WLAN_REASON_MESH_PEER_CANCELED;
ba4a14e1
TP		 250 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
251 sta->sta.addr, sta->llid, sta->plid,
252 sta->reason);
07346f81 253 spin_unlock_bh(&sta->lock);
c9370197 254
45b5028e 255 return changed;
902acc78
JB		 256}
257
f698d856 258static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
bf7cd94d 259 enum ieee80211_self_protected_actioncode action,
6f101ef0 260 u8 *da, u16 llid, u16 plid, u16 reason)
bf7cd94d 261{
f698d856 262 struct ieee80211_local *local = sdata->local;
3b69a9c5 263 struct sk_buff *skb;
e7570dfb 264 struct ieee80211_tx_info *info;
c3896d2c
LCC		 265 struct ieee80211_mgmt *mgmt;
266 bool include_plid = false;
8db09850 267 u16 peering_proto = 0;
3b69a9c5
TP		 268 u8 *pos, ie_len = 4;
269 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
270 sizeof(mgmt->u.action.u.self_prot);
f609a43d 271 int err = -ENOMEM;
3b69a9c5 272
65e8b0cc 273 skb = dev_alloc_skb(local->tx_headroom +
3b69a9c5
TP		 274 hdr_len +
275 2 + /* capability info */
276 2 + /* AID */
277 2 + 8 + /* supported rates */
278 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
279 2 + sdata->u.mesh.mesh_id_len +
280 2 + sizeof(struct ieee80211_meshconf_ie) +
176f3608 281 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 282 2 + sizeof(struct ieee80211_ht_operation) +
3b69a9c5
TP		 283 2 + 8 + /* peering IE */
284 sdata->u.mesh.ie_len);
c3896d2c 285 if (!skb)
87d84c45 286 return err;
e7570dfb 287 info = IEEE80211_SKB_CB(skb);
65e8b0cc 288 skb_reserve(skb, local->tx_headroom);
3b69a9c5
TP		 289 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
290 memset(mgmt, 0, hdr_len);
e7827a70
HH		 291 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
292 IEEE80211_STYPE_ACTION);
c3896d2c 293 memcpy(mgmt->da, da, ETH_ALEN);
47846c9b 294 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
915b5c50 295 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
8db09850
TP		 296 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
297 mgmt->u.action.u.self_prot.action_code = action;
c3896d2c 298
8db09850 299 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
55de908a
JB		 300 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
301
8db09850
TP		 302 /* capability info */
303 pos = skb_put(skb, 2);
304 memset(pos, 0, 2);
54ef656b 305 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
8db09850
TP		 306 /* AID */
307 pos = skb_put(skb, 2);
6f101ef0 308 put_unaligned_le16(plid, pos + 2);
c3896d2c 309 }
55de908a
JB		 310 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
311 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
bf7cd94d
JB		 312 mesh_add_rsn_ie(sdata, skb) ||
313 mesh_add_meshid_ie(sdata, skb) ||
314 mesh_add_meshconf_ie(sdata, skb))
f609a43d 315 goto free;
8db09850 316 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
e7570dfb 317 info->flags |= IEEE80211_TX_CTL_NO_ACK;
bf7cd94d 318 if (mesh_add_meshid_ie(sdata, skb))
f609a43d 319 goto free;
c3896d2c
LCC		 320 }
321
8db09850 322 /* Add Mesh Peering Management element */
c3896d2c 323 switch (action) {
54ef656b 324 case WLAN_SP_MESH_PEERING_OPEN:
c3896d2c 325 break;
54ef656b 326 case WLAN_SP_MESH_PEERING_CONFIRM:
8db09850 327 ie_len += 2;
c3896d2c
LCC		 328 include_plid = true;
329 break;
54ef656b 330 case WLAN_SP_MESH_PEERING_CLOSE:
8db09850
TP		 331 if (plid) {
332 ie_len += 2;
c3896d2c
LCC		 333 include_plid = true;
334 }
8db09850 335 ie_len += 2; /* reason code */
c3896d2c 336 break;
8db09850 337 default:
f609a43d
TP		 338 err = -EINVAL;
339 goto free;
c3896d2c
LCC		 340 }
341
8db09850 342 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
f609a43d 343 goto free;
8db09850 344
c3896d2c 345 pos = skb_put(skb, 2 + ie_len);
8db09850 346 *pos++ = WLAN_EID_PEER_MGMT;
c3896d2c 347 *pos++ = ie_len;
8db09850
TP		 348 memcpy(pos, &peering_proto, 2);
349 pos += 2;
6f101ef0 350 put_unaligned_le16(llid, pos);
8db09850 351 pos += 2;
c3896d2c 352 if (include_plid) {
6f101ef0 353 put_unaligned_le16(plid, pos);
8db09850 354 pos += 2;
c3896d2c 355 }
54ef656b 356 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
6f101ef0 357 put_unaligned_le16(reason, pos);
8db09850 358 pos += 2;
c3896d2c 359 }
176f3608
TP		 360
361 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
bf7cd94d
JB		 362 if (mesh_add_ht_cap_ie(sdata, skb) ||
363 mesh_add_ht_oper_ie(sdata, skb))
f609a43d 364 goto free;
176f3608
TP		 365 }
366
bf7cd94d 367 if (mesh_add_vendor_ies(sdata, skb))
f609a43d 368 goto free;
c3896d2c 369
62ae67be 370 ieee80211_tx_skb(sdata, skb);
c3896d2c 371 return 0;
f609a43d
TP		 372free:
373 kfree_skb(skb);
374 return err;
c3896d2c
LCC		 375}
376
296fcba3
TP		 377static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
378 struct sta_info *sta,
379 struct ieee802_11_elems *elems, bool insert)
c3896d2c 380{
f698d856 381 struct ieee80211_local *local = sdata->local;
55de908a 382 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
54ab1ffb 383 struct ieee80211_supported_band *sband;
f68d776a 384 u32 rates, basic_rates = 0, changed = 0;
abcff6ef 385 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
c3896d2c 386
f743ff49 387 sband = local->hw.wiphy->bands[band];
2103dec1 388 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
d0709a65 389
54ab1ffb 390 spin_lock_bh(&sta->lock);
c3896d2c 391 sta->last_rx = jiffies;
296fcba3
TP		 392
393 /* rates and capabilities don't change during peering */
394 if (sta->plink_state == NL80211_PLINK_ESTAB)
395 goto out;
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:
54ab1ffb 422 spin_unlock_bh(&sta->lock);
296fcba3
TP		 423}
424
425static struct sta_info *
426__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
427{
428 struct sta_info *sta;
54ab1ffb 429
296fcba3 430 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
e87278e7
TP		 431 return NULL;
432
296fcba3
TP		 433 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
434 if (!sta)
435 return NULL;
436
437 sta->plink_state = NL80211_PLINK_LISTEN;
a74a8c84 438 sta->sta.wme = true;
296fcba3
TP		 439
440 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
441 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
442 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
443
296fcba3
TP		 444 return sta;
445}
446
447static struct sta_info *
448mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
449 struct ieee802_11_elems *elems)
450{
451 struct sta_info *sta = NULL;
452
a6dad6a2
TP		 453 /* Userspace handles station allocation */
454 if (sdata->u.mesh.user_mpm ||
455 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
296fcba3
TP		 456 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
457 elems->ie_start,
458 elems->total_len,
459 GFP_KERNEL);
460 else
461 sta = __mesh_sta_info_alloc(sdata, addr);
462
54ab1ffb
TP		 463 return sta;
464}
465
296fcba3
TP		 466/*
467 * mesh_sta_info_get - return mesh sta info entry for @addr.
468 *
469 * @sdata: local meshif
470 * @addr: peer's address
471 * @elems: IEs from beacon or mesh peering frame.
472 *
473 * Return existing or newly allocated sta_info under RCU read lock.
474 * (re)initialize with given IEs.
475 */
476static struct sta_info *
477mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
478 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
479{
480 struct sta_info *sta = NULL;
481
482 rcu_read_lock();
483 sta = sta_info_get(sdata, addr);
484 if (sta) {
485 mesh_sta_info_init(sdata, sta, elems, false);
486 } else {
487 rcu_read_unlock();
488 /* can't run atomic */
489 sta = mesh_sta_info_alloc(sdata, addr, elems);
490 if (!sta) {
491 rcu_read_lock();
492 return NULL;
493 }
494
3b4797bc
TP		 495 mesh_sta_info_init(sdata, sta, elems, true);
496
296fcba3
TP		 497 if (sta_info_insert_rcu(sta))
498 return NULL;
499 }
500
501 return sta;
502}
503
504/*
505 * mesh_neighbour_update - update or initialize new mesh neighbor.
506 *
507 * @sdata: local meshif
508 * @addr: peer's address
509 * @elems: IEs from beacon or mesh peering frame
510 *
511 * Initiates peering if appropriate.
512 */
f743ff49
TP		 513void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
514 u8 *hw_addr,
54ab1ffb
TP		 515 struct ieee802_11_elems *elems)
516{
517 struct sta_info *sta;
39886b61 518 u32 changed = 0;
54ab1ffb 519
296fcba3 520 sta = mesh_sta_info_get(sdata, hw_addr, elems);
54ab1ffb
TP		 521 if (!sta)
522 goto out;
523
1570ca59 524 if (mesh_peer_accepts_plinks(elems) &&
54ab1ffb
TP		 525 sta->plink_state == NL80211_PLINK_LISTEN &&
526 sdata->u.mesh.accepting_plinks &&
527 sdata->u.mesh.mshcfg.auto_open_plinks &&
36c9bb29 528 rssi_threshold_check(sdata, sta))
39886b61 529 changed = mesh_plink_open(sta);
c3896d2c 530
3f52b7e3 531 ieee80211_mps_frame_release(sta, elems);
54ab1ffb 532out:
d0709a65 533 rcu_read_unlock();
2b5e1967 534 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c
LCC		 535}
536
537static void mesh_plink_timer(unsigned long data)
538{
539 struct sta_info *sta;
6f101ef0 540 u16 reason = 0;
c3896d2c 541 struct ieee80211_sub_if_data *sdata;
453e66f2 542 struct mesh_config *mshcfg;
4efec451 543 enum ieee80211_self_protected_actioncode action = 0;
c3896d2c 544
d0709a65
JB		 545 /*
546 * This STA is valid because sta_info_destroy() will
547 * del_timer_sync() this timer after having made sure
548 * it cannot be readded (by deleting the plink.)
549 */
c3896d2c
LCC		 550 sta = (struct sta_info *) data;
551
690205f1 552 if (sta->sdata->local->quiescing)
5bb644a0 553 return;
5bb644a0 554
07346f81 555 spin_lock_bh(&sta->lock);
2b470c39
BC		 556
557 /* If a timer fires just before a state transition on another CPU,
558 * we may have already extended the timeout and changed state by the
559 * time we've acquired the lock and arrived here. In that case,
560 * skip this timer and wait for the new one.
561 */
562 if (time_before(jiffies, sta->plink_timer.expires)) {
563 mpl_dbg(sta->sdata,
564 "Ignoring timer for %pM in state %s (timer adjusted)",
565 sta->sta.addr, mplstates[sta->plink_state]);
07346f81 566 spin_unlock_bh(&sta->lock);
c3896d2c
LCC		 567 return;
568 }
2b470c39
BC		 569
570 /* del_timer() and handler may race when entering these states */
571 if (sta->plink_state == NL80211_PLINK_LISTEN ||
572 sta->plink_state == NL80211_PLINK_ESTAB) {
573 mpl_dbg(sta->sdata,
574 "Ignoring timer for %pM in state %s (timer deleted)",
575 sta->sta.addr, mplstates[sta->plink_state]);
576 spin_unlock_bh(&sta->lock);
577 return;
578 }
579
bdcbd8e0 580 mpl_dbg(sta->sdata,
3088f7d2
TP		 581 "Mesh plink timer for %pM fired on state %s\n",
582 sta->sta.addr, mplstates[sta->plink_state]);
d0709a65 583 sdata = sta->sdata;
453e66f2 584 mshcfg = &sdata->u.mesh.mshcfg;
c3896d2c
LCC		 585
586 switch (sta->plink_state) {
57cf8043
JC		 587 case NL80211_PLINK_OPN_RCVD:
588 case NL80211_PLINK_OPN_SNT:
c3896d2c 589 /* retry timer */
453e66f2 590 if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) {
c3896d2c 591 u32 rand;
bdcbd8e0
JB		 592 mpl_dbg(sta->sdata,
593 "Mesh plink for %pM (retry, timeout): %d %d\n",
0c68ae26
JB		 594 sta->sta.addr, sta->plink_retries,
595 sta->plink_timeout);
c3896d2c
LCC		 596 get_random_bytes(&rand, sizeof(u32));
597 sta->plink_timeout = sta->plink_timeout +
598 rand % sta->plink_timeout;
599 ++sta->plink_retries;
d0709a65 600 mod_plink_timer(sta, sta->plink_timeout);
4efec451 601 action = WLAN_SP_MESH_PEERING_OPEN;
c3896d2c
LCC		 602 break;
603 }
6f101ef0 604 reason = WLAN_REASON_MESH_MAX_RETRIES;
c3896d2c 605 /* fall through on else */
57cf8043 606 case NL80211_PLINK_CNF_RCVD:
c3896d2c
LCC		 607 /* confirm timer */
608 if (!reason)
6f101ef0 609 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
57cf8043 610 sta->plink_state = NL80211_PLINK_HOLDING;
453e66f2 611 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
4efec451 612 action = WLAN_SP_MESH_PEERING_CLOSE;
c3896d2c 613 break;
57cf8043 614 case NL80211_PLINK_HOLDING:
c3896d2c 615 /* holding timer */
d0709a65 616 del_timer(&sta->plink_timer);
c3896d2c 617 mesh_plink_fsm_restart(sta);
c3896d2c
LCC		 618 break;
619 default:
c3896d2c
LCC		 620 break;
621 }
0f5ffd24 622 spin_unlock_bh(&sta->lock);
4efec451
TP		 623 if (action)
624 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
6f101ef0 625 sta->llid, sta->plid, reason);
c3896d2c
LCC		 626}
627
0df2f6c1 628static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
c3896d2c 629{
cc57ac53 630 sta->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
c3896d2c
LCC		 631 sta->plink_timer.data = (unsigned long) sta;
632 sta->plink_timer.function = mesh_plink_timer;
633 sta->plink_timeout = timeout;
c3896d2c
LCC		 634 add_timer(&sta->plink_timer);
635}
636
204d1304 637static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
6f101ef0 638 u16 llid)
204d1304
TP		 639{
640 struct ieee80211_local *local = sdata->local;
641 bool in_use = false;
642 struct sta_info *sta;
643
644 rcu_read_lock();
645 list_for_each_entry_rcu(sta, &local->sta_list, list) {
646 if (!memcmp(&sta->llid, &llid, sizeof(llid))) {
647 in_use = true;
648 break;
649 }
650 }
651 rcu_read_unlock();
652
653 return in_use;
654}
655
6f101ef0 656static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
204d1304
TP		 657{
658 u16 llid;
659
660 do {
661 get_random_bytes(&llid, sizeof(llid));
662 /* for mesh PS we still only have the AID range for TIM bits */
663 llid = (llid % IEEE80211_MAX_AID) + 1;
6f101ef0 664 } while (llid_in_use(sdata, llid));
204d1304 665
6f101ef0 666 return llid;
204d1304
TP		 667}
668
39886b61 669u32 mesh_plink_open(struct sta_info *sta)
c3896d2c 670{
d0709a65 671 struct ieee80211_sub_if_data *sdata = sta->sdata;
39886b61 672 u32 changed;
c3896d2c 673
c2c98fde 674 if (!test_sta_flag(sta, WLAN_STA_AUTH))
39886b61 675 return 0;
53e80511 676
07346f81 677 spin_lock_bh(&sta->lock);
204d1304 678 sta->llid = mesh_get_new_llid(sdata);
9385d04f
CYY		 679 if (sta->plink_state != NL80211_PLINK_LISTEN &&
680 sta->plink_state != NL80211_PLINK_BLOCKED) {
07346f81 681 spin_unlock_bh(&sta->lock);
39886b61 682 return 0;
c3896d2c 683 }
57cf8043 684 sta->plink_state = NL80211_PLINK_OPN_SNT;
453e66f2 685 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
07346f81 686 spin_unlock_bh(&sta->lock);
bdcbd8e0
JB		 687 mpl_dbg(sdata,
688 "Mesh plink: starting establishment with %pM\n",
0c68ae26 689 sta->sta.addr);
c3896d2c 690
3f52b7e3 691 /* set the non-peer mode to active during peering */
39886b61 692 changed = ieee80211_mps_local_status_update(sdata);
3f52b7e3 693
39886b61 694 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
204d1304 695 sta->sta.addr, sta->llid, 0, 0);
39886b61 696 return changed;
c3896d2c
LCC		 697}
698
39886b61 699u32 mesh_plink_block(struct sta_info *sta)
c3896d2c 700{
df323818 701 u32 changed;
c9370197 702
07346f81 703 spin_lock_bh(&sta->lock);
df323818 704 changed = __mesh_plink_deactivate(sta);
57cf8043 705 sta->plink_state = NL80211_PLINK_BLOCKED;
07346f81 706 spin_unlock_bh(&sta->lock);
c9370197 707
39886b61 708 return changed;
c3896d2c
LCC		 709}
710
e76d67f0
BC		 711static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
712 struct sta_info *sta,
713 enum plink_event event)
714{
715 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
716
6f101ef0
CYY		 717 u16 reason = (event == CLS_ACPT) ?
718 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
e76d67f0
BC		 719
720 sta->reason = reason;
721 sta->plink_state = NL80211_PLINK_HOLDING;
272a9e26 722 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
e76d67f0
BC		 723}
724
725static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
726 struct sta_info *sta)
727{
728 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
729 u32 changed = 0;
730
731 del_timer(&sta->plink_timer);
732 sta->plink_state = NL80211_PLINK_ESTAB;
733 changed |= mesh_plink_inc_estab_count(sdata);
734 changed |= mesh_set_ht_prot_mode(sdata);
735 changed |= mesh_set_short_slot_time(sdata);
736 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
737 ieee80211_mps_sta_status_update(sta);
738 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
739 return changed;
740}
741
c7e67811
TP		 742/**
743 * mesh_plink_fsm - step @sta MPM based on @event
744 *
745 * @sdata: interface
746 * @sta: mesh neighbor
747 * @event: peering event
748 *
749 * Return: changed MBSS flags
750 */
751static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
752 struct sta_info *sta, enum plink_event event)
753{
754 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
755 enum ieee80211_self_protected_actioncode action = 0;
756 u32 changed = 0;
757
758 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
759 mplstates[sta->plink_state], mplevents[event]);
760
761 spin_lock_bh(&sta->lock);
762 switch (sta->plink_state) {
763 case NL80211_PLINK_LISTEN:
764 switch (event) {
765 case CLS_ACPT:
766 mesh_plink_fsm_restart(sta);
767 break;
768 case OPN_ACPT:
769 sta->plink_state = NL80211_PLINK_OPN_RCVD;
204d1304 770 sta->llid = mesh_get_new_llid(sdata);
c7e67811
TP		 771 mesh_plink_timer_set(sta,
772 mshcfg->dot11MeshRetryTimeout);
773
774 /* set the non-peer mode to active during peering */
775 changed |= ieee80211_mps_local_status_update(sdata);
776 action = WLAN_SP_MESH_PEERING_OPEN;
777 break;
778 default:
779 break;
780 }
781 break;
782 case NL80211_PLINK_OPN_SNT:
783 switch (event) {
784 case OPN_RJCT:
785 case CNF_RJCT:
786 case CLS_ACPT:
787 mesh_plink_close(sdata, sta, event);
788 action = WLAN_SP_MESH_PEERING_CLOSE;
789 break;
790 case OPN_ACPT:
791 /* retry timer is left untouched */
792 sta->plink_state = NL80211_PLINK_OPN_RCVD;
793 action = WLAN_SP_MESH_PEERING_CONFIRM;
794 break;
795 case CNF_ACPT:
796 sta->plink_state = NL80211_PLINK_CNF_RCVD;
2b470c39 797 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
c7e67811
TP		 798 break;
799 default:
800 break;
801 }
802 break;
803 case NL80211_PLINK_OPN_RCVD:
804 switch (event) {
805 case OPN_RJCT:
806 case CNF_RJCT:
807 case CLS_ACPT:
808 mesh_plink_close(sdata, sta, event);
809 action = WLAN_SP_MESH_PEERING_CLOSE;
810 break;
811 case OPN_ACPT:
812 action = WLAN_SP_MESH_PEERING_CONFIRM;
813 break;
814 case CNF_ACPT:
815 changed |= mesh_plink_establish(sdata, sta);
816 break;
817 default:
818 break;
819 }
820 break;
821 case NL80211_PLINK_CNF_RCVD:
822 switch (event) {
823 case OPN_RJCT:
824 case CNF_RJCT:
825 case CLS_ACPT:
826 mesh_plink_close(sdata, sta, event);
827 action = WLAN_SP_MESH_PEERING_CLOSE;
828 break;
829 case OPN_ACPT:
830 changed |= mesh_plink_establish(sdata, sta);
831 action = WLAN_SP_MESH_PEERING_CONFIRM;
832 break;
833 default:
834 break;
835 }
836 break;
837 case NL80211_PLINK_ESTAB:
838 switch (event) {
839 case CLS_ACPT:
840 changed |= __mesh_plink_deactivate(sta);
841 changed |= mesh_set_ht_prot_mode(sdata);
842 changed |= mesh_set_short_slot_time(sdata);
843 mesh_plink_close(sdata, sta, event);
844 action = WLAN_SP_MESH_PEERING_CLOSE;
845 break;
846 case OPN_ACPT:
847 action = WLAN_SP_MESH_PEERING_CONFIRM;
848 break;
849 default:
850 break;
851 }
852 break;
853 case NL80211_PLINK_HOLDING:
854 switch (event) {
855 case CLS_ACPT:
2b470c39 856 del_timer(&sta->plink_timer);
c7e67811
TP		 857 mesh_plink_fsm_restart(sta);
858 break;
859 case OPN_ACPT:
860 case CNF_ACPT:
861 case OPN_RJCT:
862 case CNF_RJCT:
863 action = WLAN_SP_MESH_PEERING_CLOSE;
864 break;
865 default:
866 break;
867 }
868 break;
869 default:
870 /* should not get here, PLINK_BLOCKED is dealt with at the
871 * beginning of the function
872 */
873 break;
874 }
875 spin_unlock_bh(&sta->lock);
876 if (action) {
877 mesh_plink_frame_tx(sdata, action, sta->sta.addr,
878 sta->llid, sta->plid, sta->reason);
879
880 /* also send confirm in open case */
881 if (action == WLAN_SP_MESH_PEERING_OPEN) {
882 mesh_plink_frame_tx(sdata,
883 WLAN_SP_MESH_PEERING_CONFIRM,
884 sta->sta.addr, sta->llid,
885 sta->plid, 0);
886 }
887 }
888
889 return changed;
890}
891
c99a89ed
TP		 892/*
893 * mesh_plink_get_event - get correct MPM event
894 *
895 * @sdata: interface
896 * @sta: peer, leave NULL if processing a frame from a new suitable peer
897 * @elems: peering management IEs
898 * @ftype: frame type
899 * @llid: peer's peer link ID
900 * @plid: peer's local link ID
901 *
902 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
903 * an error.
904 */
905static enum plink_event
906mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
907 struct sta_info *sta,
908 struct ieee802_11_elems *elems,
909 enum ieee80211_self_protected_actioncode ftype,
6f101ef0 910 u16 llid, u16 plid)
c99a89ed
TP		 911{
912 enum plink_event event = PLINK_UNDEFINED;
913 u8 ie_len = elems->peering_len;
914 bool matches_local;
915
916 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
917 mesh_matches_local(sdata, elems));
918
919 /* deny open request from non-matching peer */
920 if (!matches_local && !sta) {
921 event = OPN_RJCT;
922 goto out;
923 }
924
925 if (!sta) {
926 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
927 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
928 goto out;
929 }
930 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
931 if (!mesh_plink_free_count(sdata)) {
932 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
933 goto out;
934 }
935 } else {
936 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
937 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
938 goto out;
939 }
940 if (sta->plink_state == NL80211_PLINK_BLOCKED)
941 goto out;
942 }
943
944 /* new matching peer */
945 if (!sta) {
946 event = OPN_ACPT;
947 goto out;
948 }
949
950 switch (ftype) {
951 case WLAN_SP_MESH_PEERING_OPEN:
952 if (!matches_local)
953 event = OPN_RJCT;
954 if (!mesh_plink_free_count(sdata) ||
955 (sta->plid && sta->plid != plid))
956 event = OPN_IGNR;
957 else
958 event = OPN_ACPT;
959 break;
960 case WLAN_SP_MESH_PEERING_CONFIRM:
961 if (!matches_local)
962 event = CNF_RJCT;
963 if (!mesh_plink_free_count(sdata) ||
6c6fa496
BC		 964 sta->llid != llid ||
965 (sta->plid && sta->plid != plid))
c99a89ed
TP		 966 event = CNF_IGNR;
967 else
968 event = CNF_ACPT;
969 break;
970 case WLAN_SP_MESH_PEERING_CLOSE:
971 if (sta->plink_state == NL80211_PLINK_ESTAB)
972 /* Do not check for llid or plid. This does not
973 * follow the standard but since multiple plinks
974 * per sta are not supported, it is necessary in
975 * order to avoid a livelock when MP A sees an
976 * establish peer link to MP B but MP B does not
977 * see it. This can be caused by a timeout in
978 * B's peer link establishment or B beign
979 * restarted.
980 */
981 event = CLS_ACPT;
982 else if (sta->plid != plid)
983 event = CLS_IGNR;
984 else if (ie_len == 8 && sta->llid != llid)
985 event = CLS_IGNR;
986 else
987 event = CLS_ACPT;
988 break;
989 default:
990 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
991 break;
992 }
993
994out:
995 return event;
996}
997
05a23ae9
TP		 998static void
999mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1000 struct ieee80211_mgmt *mgmt,
1001 struct ieee802_11_elems *elems)
c3896d2c 1002{
05a23ae9 1003
c3896d2c
LCC		 1004 struct sta_info *sta;
1005 enum plink_event event;
54ef656b 1006 enum ieee80211_self_protected_actioncode ftype;
57aac7c5 1007 u32 changed = 0;
c99a89ed 1008 u8 ie_len = elems->peering_len;
6f101ef0 1009 u16 plid, llid = 0;
c3896d2c 1010
05a23ae9 1011 if (!elems->peering) {
bdcbd8e0
JB		 1012 mpl_dbg(sdata,
1013 "Mesh plink: missing necessary peer link ie\n");
c3896d2c
LCC		 1014 return;
1015 }
bf7cd94d 1016
05a23ae9 1017 if (elems->rsn_len &&
bf7cd94d 1018 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
bdcbd8e0
JB		 1019 mpl_dbg(sdata,
1020 "Mesh plink: can't establish link with secure peer\n");
5cff5e01
JC		 1021 return;
1022 }
c3896d2c 1023
8db09850 1024 ftype = mgmt->u.action.u.self_prot.action_code;
8db09850
TP		 1025 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1026 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1027 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1028 && ie_len != 8)) {
bdcbd8e0
JB		 1029 mpl_dbg(sdata,
1030 "Mesh plink: incorrect plink ie length %d %d\n",
1031 ftype, ie_len);
c3896d2c
LCC		 1032 return;
1033 }
1034
54ef656b 1035 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
05a23ae9 1036 (!elems->mesh_id || !elems->mesh_config)) {
bdcbd8e0 1037 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
c3896d2c
LCC		 1038 return;
1039 }
1040 /* Note the lines below are correct, the llid in the frame is the plid
1041 * from the point of view of this host.
1042 */
f8134fed 1043 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
54ef656b 1044 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
f8134fed
BC		 1045 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1046 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
c3896d2c 1047
296fcba3 1048 /* WARNING: Only for sta pointer, is dropped & re-acquired */
d0709a65
JB		 1049 rcu_read_lock();
1050
abe60632 1051 sta = sta_info_get(sdata, mgmt->sa);
32cb05bf 1052
55335137 1053 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
36c9bb29 1054 !rssi_threshold_check(sdata, sta)) {
bdcbd8e0 1055 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
3d4f9699 1056 mgmt->sa);
fc10302e 1057 goto unlock_rcu;
55335137
AN		 1058 }
1059
c3896d2c 1060 /* Now we will figure out the appropriate event... */
c99a89ed 1061 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
54ab1ffb
TP		 1062
1063 if (event == OPN_ACPT) {
296fcba3 1064 rcu_read_unlock();
54ab1ffb 1065 /* allocate sta entry if necessary and update info */
05a23ae9 1066 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
54ab1ffb 1067 if (!sta) {
bdcbd8e0 1068 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
fc10302e 1069 goto unlock_rcu;
54ab1ffb 1070 }
5bbdd6c6 1071 sta->plid = plid;
c99a89ed
TP		 1072 } else if (!sta && event == OPN_RJCT) {
1073 mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
1074 mgmt->sa, 0, plid,
6f101ef0 1075 WLAN_REASON_MESH_CONFIG);
c99a89ed
TP		 1076 goto unlock_rcu;
1077 } else if (!sta || event == PLINK_UNDEFINED) {
1078 /* something went wrong */
1079 goto unlock_rcu;
c3896d2c
LCC		 1080 }
1081
6c6fa496
BC		 1082 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1083 if (!sta->plid && event == CNF_ACPT)
1084 sta->plid = plid;
1085
c7e67811 1086 changed |= mesh_plink_fsm(sdata, sta, event);
d0709a65 1087
fc10302e 1088unlock_rcu:
d0709a65 1089 rcu_read_unlock();
57aac7c5 1090
ecccd072 1091 if (changed)
2b5e1967 1092 ieee80211_mbss_info_change_notify(sdata, changed);
c3896d2c 1093}
05a23ae9
TP		 1094
1095void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1096 struct ieee80211_mgmt *mgmt, size_t len,
1097 struct ieee80211_rx_status *rx_status)
1098{
1099 struct ieee802_11_elems elems;
1100 size_t baselen;
1101 u8 *baseaddr;
1102
1103 /* need action_code, aux */
1104 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1105 return;
1106
1107 if (sdata->u.mesh.user_mpm)
1108 /* userspace must register for these */
1109 return;
1110
1111 if (is_multicast_ether_addr(mgmt->da)) {
1112 mpl_dbg(sdata,
1113 "Mesh plink: ignore frame from multicast address\n");
1114 return;
1115 }
1116
1117 baseaddr = mgmt->u.action.u.self_prot.variable;
1118 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1119 if (mgmt->u.action.u.self_prot.action_code ==
1120 WLAN_SP_MESH_PEERING_CONFIRM) {
1121 baseaddr += 4;
1122 baselen += 4;
1123 }
1124 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1125 mesh_process_plink_frame(sdata, mgmt, &elems);
1126}
Linux kernel - Deliverables
This page took 0.569765 seconds and 5 git commands to generate.