1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2019 Intel Corporation
5 * Author: Luis Carlos Cobo <luisca@cozybit.com>
6 */
7 #include <linux/gfp.h>
8 #include <linux/kernel.h>
9 #include <linux/random.h>
10 #include <linux/rculist.h>
11
12 #include "ieee80211_i.h"
13 #include "rate.h"
14 #include "mesh.h"
15
16 #define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
17 #define PLINK_GET_LLID(p) (p + 2)
18 #define PLINK_GET_PLID(p) (p + 4)
19
20 #define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
21 jiffies + msecs_to_jiffies(t)))
22
23 enum 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
35 static 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
45 static 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
57 /* We only need a valid sta if user configured a minimum rssi_threshold. */
rssi_threshold_check(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)58 static 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 ||
63 (sta &&
64 (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) >
65 rssi_threshold);
66 }
67
68 /**
69 * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
70 *
71 * @sta: mesh peer link to restart
72 *
73 * Locking: this function must be called holding sta->mesh->plink_lock
74 */
mesh_plink_fsm_restart(struct sta_info * sta)75 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
76 {
77 lockdep_assert_held(&sta->mesh->plink_lock);
78 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
79 sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
80 sta->mesh->plink_retries = 0;
81 }
82
83 /*
84 * mesh_set_short_slot_time - enable / disable ERP short slot time.
85 *
86 * The standard indirectly mandates mesh STAs to turn off short slot time by
87 * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
88 * can't be sneaky about it. Enable short slot time if all mesh STAs in the
89 * MBSS support ERP rates.
90 *
91 * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
92 */
mesh_set_short_slot_time(struct ieee80211_sub_if_data * sdata)93 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
94 {
95 struct ieee80211_local *local = sdata->local;
96 struct ieee80211_supported_band *sband;
97 struct sta_info *sta;
98 u32 erp_rates = 0, changed = 0;
99 int i;
100 bool short_slot = false;
101
102 sband = ieee80211_get_sband(sdata);
103 if (!sband)
104 return changed;
105
106 if (sband->band == NL80211_BAND_5GHZ) {
107 /* (IEEE 802.11-2012 19.4.5) */
108 short_slot = true;
109 goto out;
110 } else if (sband->band != NL80211_BAND_2GHZ) {
111 goto out;
112 }
113
114 for (i = 0; i < sband->n_bitrates; i++)
115 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
116 erp_rates |= BIT(i);
117
118 if (!erp_rates)
119 goto out;
120
121 rcu_read_lock();
122 list_for_each_entry_rcu(sta, &local->sta_list, list) {
123 if (sdata != sta->sdata ||
124 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
125 continue;
126
127 short_slot = false;
128 if (erp_rates & sta->sta.supp_rates[sband->band])
129 short_slot = true;
130 else
131 break;
132 }
133 rcu_read_unlock();
134
135 out:
136 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
137 sdata->vif.bss_conf.use_short_slot = short_slot;
138 changed = BSS_CHANGED_ERP_SLOT;
139 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
140 sdata->vif.addr, short_slot);
141 }
142 return changed;
143 }
144
145 /**
146 * mesh_set_ht_prot_mode - set correct HT protection mode
147 *
148 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
149 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
150 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
151 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
152 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
153 * HT20 peer is present. Otherwise no-protection mode is selected.
154 */
mesh_set_ht_prot_mode(struct ieee80211_sub_if_data * sdata)155 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
156 {
157 struct ieee80211_local *local = sdata->local;
158 struct sta_info *sta;
159 u16 ht_opmode;
160 bool non_ht_sta = false, ht20_sta = false;
161
162 switch (sdata->vif.bss_conf.chandef.width) {
163 case NL80211_CHAN_WIDTH_20_NOHT:
164 case NL80211_CHAN_WIDTH_5:
165 case NL80211_CHAN_WIDTH_10:
166 return 0;
167 default:
168 break;
169 }
170
171 rcu_read_lock();
172 list_for_each_entry_rcu(sta, &local->sta_list, list) {
173 if (sdata != sta->sdata ||
174 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
175 continue;
176
177 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
178 continue;
179
180 if (!sta->sta.ht_cap.ht_supported) {
181 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
182 sta->sta.addr);
183 non_ht_sta = true;
184 break;
185 }
186
187 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
188 ht20_sta = true;
189 }
190 rcu_read_unlock();
191
192 if (non_ht_sta)
193 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
194 else if (ht20_sta &&
195 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
196 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
197 else
198 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
199
200 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
201 return 0;
202
203 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
204 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
205 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
206 return BSS_CHANGED_HT;
207 }
208
mesh_plink_frame_tx(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,enum ieee80211_self_protected_actioncode action,u8 * da,u16 llid,u16 plid,u16 reason)209 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
210 struct sta_info *sta,
211 enum ieee80211_self_protected_actioncode action,
212 u8 *da, u16 llid, u16 plid, u16 reason)
213 {
214 struct ieee80211_local *local = sdata->local;
215 struct sk_buff *skb;
216 struct ieee80211_tx_info *info;
217 struct ieee80211_mgmt *mgmt;
218 bool include_plid = false;
219 u16 peering_proto = 0;
220 u8 *pos, ie_len = 4;
221 u8 ie_len_he_cap;
222 int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
223 int err = -ENOMEM;
224
225 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
226 NL80211_IFTYPE_MESH_POINT);
227 skb = dev_alloc_skb(local->tx_headroom +
228 hdr_len +
229 2 + /* capability info */
230 2 + /* AID */
231 2 + 8 + /* supported rates */
232 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
233 2 + sdata->u.mesh.mesh_id_len +
234 2 + sizeof(struct ieee80211_meshconf_ie) +
235 2 + sizeof(struct ieee80211_ht_cap) +
236 2 + sizeof(struct ieee80211_ht_operation) +
237 2 + sizeof(struct ieee80211_vht_cap) +
238 2 + sizeof(struct ieee80211_vht_operation) +
239 ie_len_he_cap +
240 2 + 1 + sizeof(struct ieee80211_he_operation) +
241 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
242 2 + 8 + /* peering IE */
243 sdata->u.mesh.ie_len);
244 if (!skb)
245 return err;
246 info = IEEE80211_SKB_CB(skb);
247 skb_reserve(skb, local->tx_headroom);
248 mgmt = skb_put_zero(skb, hdr_len);
249 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
250 IEEE80211_STYPE_ACTION);
251 memcpy(mgmt->da, da, ETH_ALEN);
252 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
253 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
254 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
255 mgmt->u.action.u.self_prot.action_code = action;
256
257 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
258 struct ieee80211_supported_band *sband;
259 enum nl80211_band band;
260
261 sband = ieee80211_get_sband(sdata);
262 if (!sband) {
263 err = -EINVAL;
264 goto free;
265 }
266 band = sband->band;
267
268 /* capability info */
269 pos = skb_put_zero(skb, 2);
270 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
271 /* AID */
272 pos = skb_put(skb, 2);
273 put_unaligned_le16(sta->sta.aid, pos);
274 }
275 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
276 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
277 mesh_add_rsn_ie(sdata, skb) ||
278 mesh_add_meshid_ie(sdata, skb) ||
279 mesh_add_meshconf_ie(sdata, skb))
280 goto free;
281 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
282 info->flags |= IEEE80211_TX_CTL_NO_ACK;
283 if (mesh_add_meshid_ie(sdata, skb))
284 goto free;
285 }
286
287 /* Add Mesh Peering Management element */
288 switch (action) {
289 case WLAN_SP_MESH_PEERING_OPEN:
290 break;
291 case WLAN_SP_MESH_PEERING_CONFIRM:
292 ie_len += 2;
293 include_plid = true;
294 break;
295 case WLAN_SP_MESH_PEERING_CLOSE:
296 if (plid) {
297 ie_len += 2;
298 include_plid = true;
299 }
300 ie_len += 2; /* reason code */
301 break;
302 default:
303 err = -EINVAL;
304 goto free;
305 }
306
307 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
308 goto free;
309
310 pos = skb_put(skb, 2 + ie_len);
311 *pos++ = WLAN_EID_PEER_MGMT;
312 *pos++ = ie_len;
313 memcpy(pos, &peering_proto, 2);
314 pos += 2;
315 put_unaligned_le16(llid, pos);
316 pos += 2;
317 if (include_plid) {
318 put_unaligned_le16(plid, pos);
319 pos += 2;
320 }
321 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
322 put_unaligned_le16(reason, pos);
323 pos += 2;
324 }
325
326 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
327 if (mesh_add_ht_cap_ie(sdata, skb) ||
328 mesh_add_ht_oper_ie(sdata, skb) ||
329 mesh_add_vht_cap_ie(sdata, skb) ||
330 mesh_add_vht_oper_ie(sdata, skb) ||
331 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
332 mesh_add_he_oper_ie(sdata, skb) ||
333 mesh_add_he_6ghz_cap_ie(sdata, skb))
334 goto free;
335 }
336
337 if (mesh_add_vendor_ies(sdata, skb))
338 goto free;
339
340 ieee80211_tx_skb(sdata, skb);
341 return 0;
342 free:
343 kfree_skb(skb);
344 return err;
345 }
346
347 /**
348 * __mesh_plink_deactivate - deactivate mesh peer link
349 *
350 * @sta: mesh peer link to deactivate
351 *
352 * Mesh paths with this peer as next hop should be flushed
353 * by the caller outside of plink_lock.
354 *
355 * Returns beacon changed flag if the beacon content changed.
356 *
357 * Locking: the caller must hold sta->mesh->plink_lock
358 */
__mesh_plink_deactivate(struct sta_info * sta)359 static u32 __mesh_plink_deactivate(struct sta_info *sta)
360 {
361 struct ieee80211_sub_if_data *sdata = sta->sdata;
362 u32 changed = 0;
363
364 lockdep_assert_held(&sta->mesh->plink_lock);
365
366 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
367 changed = mesh_plink_dec_estab_count(sdata);
368 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
369
370 ieee80211_mps_sta_status_update(sta);
371 changed |= ieee80211_mps_set_sta_local_pm(sta,
372 NL80211_MESH_POWER_UNKNOWN);
373
374 return changed;
375 }
376
377 /**
378 * mesh_plink_deactivate - deactivate mesh peer link
379 *
380 * @sta: mesh peer link to deactivate
381 *
382 * All mesh paths with this peer as next hop will be flushed
383 */
mesh_plink_deactivate(struct sta_info * sta)384 u32 mesh_plink_deactivate(struct sta_info *sta)
385 {
386 struct ieee80211_sub_if_data *sdata = sta->sdata;
387 u32 changed;
388
389 spin_lock_bh(&sta->mesh->plink_lock);
390 changed = __mesh_plink_deactivate(sta);
391
392 if (!sdata->u.mesh.user_mpm) {
393 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
394 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
395 sta->sta.addr, sta->mesh->llid,
396 sta->mesh->plid, sta->mesh->reason);
397 }
398 spin_unlock_bh(&sta->mesh->plink_lock);
399 if (!sdata->u.mesh.user_mpm)
400 del_timer_sync(&sta->mesh->plink_timer);
401 mesh_path_flush_by_nexthop(sta);
402
403 /* make sure no readers can access nexthop sta from here on */
404 synchronize_net();
405
406 return changed;
407 }
408
mesh_sta_info_init(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee802_11_elems * elems)409 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
410 struct sta_info *sta,
411 struct ieee802_11_elems *elems)
412 {
413 struct ieee80211_local *local = sdata->local;
414 struct ieee80211_supported_band *sband;
415 u32 rates, basic_rates = 0, changed = 0;
416 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
417
418 sband = ieee80211_get_sband(sdata);
419 if (!sband)
420 return;
421
422 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
423 &basic_rates);
424
425 spin_lock_bh(&sta->mesh->plink_lock);
426 sta->rx_stats.last_rx = jiffies;
427
428 /* rates and capabilities don't change during peering */
429 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
430 sta->mesh->processed_beacon)
431 goto out;
432 sta->mesh->processed_beacon = true;
433
434 if (sta->sta.supp_rates[sband->band] != rates)
435 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
436 sta->sta.supp_rates[sband->band] = rates;
437
438 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
439 elems->ht_cap_elem, sta))
440 changed |= IEEE80211_RC_BW_CHANGED;
441
442 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
443 elems->vht_cap_elem, sta);
444
445 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
446 elems->he_cap_len, sta);
447
448 if (bw != sta->sta.bandwidth)
449 changed |= IEEE80211_RC_BW_CHANGED;
450
451 /* HT peer is operating 20MHz-only */
452 if (elems->ht_operation &&
453 !(elems->ht_operation->ht_param &
454 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
455 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
456 changed |= IEEE80211_RC_BW_CHANGED;
457 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
458 }
459
460 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
461 rate_control_rate_init(sta);
462 else
463 rate_control_rate_update(local, sband, sta, changed);
464 out:
465 spin_unlock_bh(&sta->mesh->plink_lock);
466 }
467
mesh_allocate_aid(struct ieee80211_sub_if_data * sdata)468 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
469 {
470 struct sta_info *sta;
471 unsigned long *aid_map;
472 int aid;
473
474 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
475 sizeof(*aid_map), GFP_KERNEL);
476 if (!aid_map)
477 return -ENOMEM;
478
479 /* reserve aid 0 for mcast indication */
480 __set_bit(0, aid_map);
481
482 rcu_read_lock();
483 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
484 __set_bit(sta->sta.aid, aid_map);
485 rcu_read_unlock();
486
487 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
488 kfree(aid_map);
489
490 if (aid > IEEE80211_MAX_AID)
491 return -ENOBUFS;
492
493 return aid;
494 }
495
496 static struct sta_info *
__mesh_sta_info_alloc(struct ieee80211_sub_if_data * sdata,u8 * hw_addr)497 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
498 {
499 struct sta_info *sta;
500 int aid;
501
502 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
503 return NULL;
504
505 aid = mesh_allocate_aid(sdata);
506 if (aid < 0)
507 return NULL;
508
509 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
510 if (!sta)
511 return NULL;
512
513 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
514 sta->sta.wme = true;
515 sta->sta.aid = aid;
516
517 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
518 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
519 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
520
521 return sta;
522 }
523
524 static struct sta_info *
mesh_sta_info_alloc(struct ieee80211_sub_if_data * sdata,u8 * addr,struct ieee802_11_elems * elems,struct ieee80211_rx_status * rx_status)525 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
526 struct ieee802_11_elems *elems,
527 struct ieee80211_rx_status *rx_status)
528 {
529 struct sta_info *sta = NULL;
530
531 /* Userspace handles station allocation */
532 if (sdata->u.mesh.user_mpm ||
533 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
534 if (mesh_peer_accepts_plinks(elems) &&
535 mesh_plink_availables(sdata)) {
536 int sig = 0;
537
538 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
539 sig = rx_status->signal;
540
541 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
542 elems->ie_start,
543 elems->total_len,
544 sig, GFP_KERNEL);
545 }
546 } else
547 sta = __mesh_sta_info_alloc(sdata, addr);
548
549 return sta;
550 }
551
552 /*
553 * mesh_sta_info_get - return mesh sta info entry for @addr.
554 *
555 * @sdata: local meshif
556 * @addr: peer's address
557 * @elems: IEs from beacon or mesh peering frame.
558 * @rx_status: rx status for the frame for signal reporting
559 *
560 * Return existing or newly allocated sta_info under RCU read lock.
561 * (re)initialize with given IEs.
562 */
563 static struct sta_info *
mesh_sta_info_get(struct ieee80211_sub_if_data * sdata,u8 * addr,struct ieee802_11_elems * elems,struct ieee80211_rx_status * rx_status)564 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
565 u8 *addr, struct ieee802_11_elems *elems,
566 struct ieee80211_rx_status *rx_status) __acquires(RCU)
567 {
568 struct sta_info *sta = NULL;
569
570 rcu_read_lock();
571 sta = sta_info_get(sdata, addr);
572 if (sta) {
573 mesh_sta_info_init(sdata, sta, elems);
574 } else {
575 rcu_read_unlock();
576 /* can't run atomic */
577 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
578 if (!sta) {
579 rcu_read_lock();
580 return NULL;
581 }
582
583 mesh_sta_info_init(sdata, sta, elems);
584
585 if (sta_info_insert_rcu(sta))
586 return NULL;
587 }
588
589 return sta;
590 }
591
592 /*
593 * mesh_neighbour_update - update or initialize new mesh neighbor.
594 *
595 * @sdata: local meshif
596 * @addr: peer's address
597 * @elems: IEs from beacon or mesh peering frame
598 * @rx_status: rx status for the frame for signal reporting
599 *
600 * Initiates peering if appropriate.
601 */
mesh_neighbour_update(struct ieee80211_sub_if_data * sdata,u8 * hw_addr,struct ieee802_11_elems * elems,struct ieee80211_rx_status * rx_status)602 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
603 u8 *hw_addr,
604 struct ieee802_11_elems *elems,
605 struct ieee80211_rx_status *rx_status)
606 {
607 struct sta_info *sta;
608 u32 changed = 0;
609
610 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
611 if (!sta)
612 goto out;
613
614 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
615 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
616
617 if (mesh_peer_accepts_plinks(elems) &&
618 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
619 sdata->u.mesh.accepting_plinks &&
620 sdata->u.mesh.mshcfg.auto_open_plinks &&
621 rssi_threshold_check(sdata, sta))
622 changed = mesh_plink_open(sta);
623
624 ieee80211_mps_frame_release(sta, elems);
625 out:
626 rcu_read_unlock();
627 ieee80211_mbss_info_change_notify(sdata, changed);
628 }
629
mesh_plink_timer(struct timer_list * t)630 void mesh_plink_timer(struct timer_list *t)
631 {
632 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
633 struct sta_info *sta;
634 u16 reason = 0;
635 struct ieee80211_sub_if_data *sdata;
636 struct mesh_config *mshcfg;
637 enum ieee80211_self_protected_actioncode action = 0;
638
639 /*
640 * This STA is valid because sta_info_destroy() will
641 * del_timer_sync() this timer after having made sure
642 * it cannot be readded (by deleting the plink.)
643 */
644 sta = mesh->plink_sta;
645
646 if (sta->sdata->local->quiescing)
647 return;
648
649 spin_lock_bh(&sta->mesh->plink_lock);
650
651 /* If a timer fires just before a state transition on another CPU,
652 * we may have already extended the timeout and changed state by the
653 * time we've acquired the lock and arrived here. In that case,
654 * skip this timer and wait for the new one.
655 */
656 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
657 mpl_dbg(sta->sdata,
658 "Ignoring timer for %pM in state %s (timer adjusted)",
659 sta->sta.addr, mplstates[sta->mesh->plink_state]);
660 spin_unlock_bh(&sta->mesh->plink_lock);
661 return;
662 }
663
664 /* del_timer() and handler may race when entering these states */
665 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
666 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
667 mpl_dbg(sta->sdata,
668 "Ignoring timer for %pM in state %s (timer deleted)",
669 sta->sta.addr, mplstates[sta->mesh->plink_state]);
670 spin_unlock_bh(&sta->mesh->plink_lock);
671 return;
672 }
673
674 mpl_dbg(sta->sdata,
675 "Mesh plink timer for %pM fired on state %s\n",
676 sta->sta.addr, mplstates[sta->mesh->plink_state]);
677 sdata = sta->sdata;
678 mshcfg = &sdata->u.mesh.mshcfg;
679
680 switch (sta->mesh->plink_state) {
681 case NL80211_PLINK_OPN_RCVD:
682 case NL80211_PLINK_OPN_SNT:
683 /* retry timer */
684 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
685 u32 rand;
686 mpl_dbg(sta->sdata,
687 "Mesh plink for %pM (retry, timeout): %d %d\n",
688 sta->sta.addr, sta->mesh->plink_retries,
689 sta->mesh->plink_timeout);
690 get_random_bytes(&rand, sizeof(u32));
691 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
692 rand % sta->mesh->plink_timeout;
693 ++sta->mesh->plink_retries;
694 mod_plink_timer(sta, sta->mesh->plink_timeout);
695 action = WLAN_SP_MESH_PEERING_OPEN;
696 break;
697 }
698 reason = WLAN_REASON_MESH_MAX_RETRIES;
699 /* fall through */
700 case NL80211_PLINK_CNF_RCVD:
701 /* confirm timer */
702 if (!reason)
703 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
704 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
705 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
706 action = WLAN_SP_MESH_PEERING_CLOSE;
707 break;
708 case NL80211_PLINK_HOLDING:
709 /* holding timer */
710 del_timer(&sta->mesh->plink_timer);
711 mesh_plink_fsm_restart(sta);
712 break;
713 default:
714 break;
715 }
716 spin_unlock_bh(&sta->mesh->plink_lock);
717 if (action)
718 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
719 sta->mesh->llid, sta->mesh->plid, reason);
720 }
721
mesh_plink_timer_set(struct sta_info * sta,u32 timeout)722 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
723 {
724 sta->mesh->plink_timeout = timeout;
725 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
726 }
727
llid_in_use(struct ieee80211_sub_if_data * sdata,u16 llid)728 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
729 u16 llid)
730 {
731 struct ieee80211_local *local = sdata->local;
732 bool in_use = false;
733 struct sta_info *sta;
734
735 rcu_read_lock();
736 list_for_each_entry_rcu(sta, &local->sta_list, list) {
737 if (sdata != sta->sdata)
738 continue;
739
740 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
741 in_use = true;
742 break;
743 }
744 }
745 rcu_read_unlock();
746
747 return in_use;
748 }
749
mesh_get_new_llid(struct ieee80211_sub_if_data * sdata)750 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
751 {
752 u16 llid;
753
754 do {
755 get_random_bytes(&llid, sizeof(llid));
756 } while (llid_in_use(sdata, llid));
757
758 return llid;
759 }
760
mesh_plink_open(struct sta_info * sta)761 u32 mesh_plink_open(struct sta_info *sta)
762 {
763 struct ieee80211_sub_if_data *sdata = sta->sdata;
764 u32 changed;
765
766 if (!test_sta_flag(sta, WLAN_STA_AUTH))
767 return 0;
768
769 spin_lock_bh(&sta->mesh->plink_lock);
770 sta->mesh->llid = mesh_get_new_llid(sdata);
771 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
772 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
773 spin_unlock_bh(&sta->mesh->plink_lock);
774 return 0;
775 }
776 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
777 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
778 spin_unlock_bh(&sta->mesh->plink_lock);
779 mpl_dbg(sdata,
780 "Mesh plink: starting establishment with %pM\n",
781 sta->sta.addr);
782
783 /* set the non-peer mode to active during peering */
784 changed = ieee80211_mps_local_status_update(sdata);
785
786 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
787 sta->sta.addr, sta->mesh->llid, 0, 0);
788 return changed;
789 }
790
mesh_plink_block(struct sta_info * sta)791 u32 mesh_plink_block(struct sta_info *sta)
792 {
793 u32 changed;
794
795 spin_lock_bh(&sta->mesh->plink_lock);
796 changed = __mesh_plink_deactivate(sta);
797 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
798 spin_unlock_bh(&sta->mesh->plink_lock);
799 mesh_path_flush_by_nexthop(sta);
800
801 return changed;
802 }
803
mesh_plink_close(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,enum plink_event event)804 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
805 struct sta_info *sta,
806 enum plink_event event)
807 {
808 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
809 u16 reason = (event == CLS_ACPT) ?
810 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
811
812 sta->mesh->reason = reason;
813 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
814 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
815 }
816
mesh_plink_establish(struct ieee80211_sub_if_data * sdata,struct sta_info * sta)817 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
818 struct sta_info *sta)
819 {
820 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
821 u32 changed = 0;
822
823 del_timer(&sta->mesh->plink_timer);
824 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
825 changed |= mesh_plink_inc_estab_count(sdata);
826 changed |= mesh_set_ht_prot_mode(sdata);
827 changed |= mesh_set_short_slot_time(sdata);
828 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
829 ieee80211_mps_sta_status_update(sta);
830 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
831 return changed;
832 }
833
834 /**
835 * mesh_plink_fsm - step @sta MPM based on @event
836 *
837 * @sdata: interface
838 * @sta: mesh neighbor
839 * @event: peering event
840 *
841 * Return: changed MBSS flags
842 */
mesh_plink_fsm(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,enum plink_event event)843 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
844 struct sta_info *sta, enum plink_event event)
845 {
846 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
847 enum ieee80211_self_protected_actioncode action = 0;
848 u32 changed = 0;
849 bool flush = false;
850
851 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
852 mplstates[sta->mesh->plink_state], mplevents[event]);
853
854 spin_lock_bh(&sta->mesh->plink_lock);
855 switch (sta->mesh->plink_state) {
856 case NL80211_PLINK_LISTEN:
857 switch (event) {
858 case CLS_ACPT:
859 mesh_plink_fsm_restart(sta);
860 break;
861 case OPN_ACPT:
862 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
863 sta->mesh->llid = mesh_get_new_llid(sdata);
864 mesh_plink_timer_set(sta,
865 mshcfg->dot11MeshRetryTimeout);
866
867 /* set the non-peer mode to active during peering */
868 changed |= ieee80211_mps_local_status_update(sdata);
869 action = WLAN_SP_MESH_PEERING_OPEN;
870 break;
871 default:
872 break;
873 }
874 break;
875 case NL80211_PLINK_OPN_SNT:
876 switch (event) {
877 case OPN_RJCT:
878 case CNF_RJCT:
879 case CLS_ACPT:
880 mesh_plink_close(sdata, sta, event);
881 action = WLAN_SP_MESH_PEERING_CLOSE;
882 break;
883 case OPN_ACPT:
884 /* retry timer is left untouched */
885 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
886 action = WLAN_SP_MESH_PEERING_CONFIRM;
887 break;
888 case CNF_ACPT:
889 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
890 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
891 break;
892 default:
893 break;
894 }
895 break;
896 case NL80211_PLINK_OPN_RCVD:
897 switch (event) {
898 case OPN_RJCT:
899 case CNF_RJCT:
900 case CLS_ACPT:
901 mesh_plink_close(sdata, sta, event);
902 action = WLAN_SP_MESH_PEERING_CLOSE;
903 break;
904 case OPN_ACPT:
905 action = WLAN_SP_MESH_PEERING_CONFIRM;
906 break;
907 case CNF_ACPT:
908 changed |= mesh_plink_establish(sdata, sta);
909 break;
910 default:
911 break;
912 }
913 break;
914 case NL80211_PLINK_CNF_RCVD:
915 switch (event) {
916 case OPN_RJCT:
917 case CNF_RJCT:
918 case CLS_ACPT:
919 mesh_plink_close(sdata, sta, event);
920 action = WLAN_SP_MESH_PEERING_CLOSE;
921 break;
922 case OPN_ACPT:
923 changed |= mesh_plink_establish(sdata, sta);
924 action = WLAN_SP_MESH_PEERING_CONFIRM;
925 break;
926 default:
927 break;
928 }
929 break;
930 case NL80211_PLINK_ESTAB:
931 switch (event) {
932 case CLS_ACPT:
933 changed |= __mesh_plink_deactivate(sta);
934 changed |= mesh_set_ht_prot_mode(sdata);
935 changed |= mesh_set_short_slot_time(sdata);
936 mesh_plink_close(sdata, sta, event);
937 action = WLAN_SP_MESH_PEERING_CLOSE;
938 flush = true;
939 break;
940 case OPN_ACPT:
941 action = WLAN_SP_MESH_PEERING_CONFIRM;
942 break;
943 default:
944 break;
945 }
946 break;
947 case NL80211_PLINK_HOLDING:
948 switch (event) {
949 case CLS_ACPT:
950 del_timer(&sta->mesh->plink_timer);
951 mesh_plink_fsm_restart(sta);
952 break;
953 case OPN_ACPT:
954 case CNF_ACPT:
955 case OPN_RJCT:
956 case CNF_RJCT:
957 action = WLAN_SP_MESH_PEERING_CLOSE;
958 break;
959 default:
960 break;
961 }
962 break;
963 default:
964 /* should not get here, PLINK_BLOCKED is dealt with at the
965 * beginning of the function
966 */
967 break;
968 }
969 spin_unlock_bh(&sta->mesh->plink_lock);
970 if (flush)
971 mesh_path_flush_by_nexthop(sta);
972 if (action) {
973 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
974 sta->mesh->llid, sta->mesh->plid,
975 sta->mesh->reason);
976
977 /* also send confirm in open case */
978 if (action == WLAN_SP_MESH_PEERING_OPEN) {
979 mesh_plink_frame_tx(sdata, sta,
980 WLAN_SP_MESH_PEERING_CONFIRM,
981 sta->sta.addr, sta->mesh->llid,
982 sta->mesh->plid, 0);
983 }
984 }
985
986 return changed;
987 }
988
989 /*
990 * mesh_plink_get_event - get correct MPM event
991 *
992 * @sdata: interface
993 * @sta: peer, leave NULL if processing a frame from a new suitable peer
994 * @elems: peering management IEs
995 * @ftype: frame type
996 * @llid: peer's peer link ID
997 * @plid: peer's local link ID
998 *
999 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1000 * an error.
1001 */
1002 static enum plink_event
mesh_plink_get_event(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee802_11_elems * elems,enum ieee80211_self_protected_actioncode ftype,u16 llid,u16 plid)1003 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1004 struct sta_info *sta,
1005 struct ieee802_11_elems *elems,
1006 enum ieee80211_self_protected_actioncode ftype,
1007 u16 llid, u16 plid)
1008 {
1009 enum plink_event event = PLINK_UNDEFINED;
1010 u8 ie_len = elems->peering_len;
1011 bool matches_local;
1012
1013 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1014 mesh_matches_local(sdata, elems));
1015
1016 /* deny open request from non-matching peer */
1017 if (!matches_local && !sta) {
1018 event = OPN_RJCT;
1019 goto out;
1020 }
1021
1022 if (!sta) {
1023 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1024 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1025 goto out;
1026 }
1027 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1028 if (!mesh_plink_free_count(sdata)) {
1029 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1030 goto out;
1031 }
1032
1033 /* new matching peer */
1034 event = OPN_ACPT;
1035 goto out;
1036 } else {
1037 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1038 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1039 goto out;
1040 }
1041 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1042 goto out;
1043 }
1044
1045 switch (ftype) {
1046 case WLAN_SP_MESH_PEERING_OPEN:
1047 if (!matches_local)
1048 event = OPN_RJCT;
1049 else if (!mesh_plink_free_count(sdata) ||
1050 (sta->mesh->plid && sta->mesh->plid != plid))
1051 event = OPN_IGNR;
1052 else
1053 event = OPN_ACPT;
1054 break;
1055 case WLAN_SP_MESH_PEERING_CONFIRM:
1056 if (!matches_local)
1057 event = CNF_RJCT;
1058 else if (!mesh_plink_free_count(sdata) ||
1059 sta->mesh->llid != llid ||
1060 (sta->mesh->plid && sta->mesh->plid != plid))
1061 event = CNF_IGNR;
1062 else
1063 event = CNF_ACPT;
1064 break;
1065 case WLAN_SP_MESH_PEERING_CLOSE:
1066 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1067 /* Do not check for llid or plid. This does not
1068 * follow the standard but since multiple plinks
1069 * per sta are not supported, it is necessary in
1070 * order to avoid a livelock when MP A sees an
1071 * establish peer link to MP B but MP B does not
1072 * see it. This can be caused by a timeout in
1073 * B's peer link establishment or B beign
1074 * restarted.
1075 */
1076 event = CLS_ACPT;
1077 else if (sta->mesh->plid != plid)
1078 event = CLS_IGNR;
1079 else if (ie_len == 8 && sta->mesh->llid != llid)
1080 event = CLS_IGNR;
1081 else
1082 event = CLS_ACPT;
1083 break;
1084 default:
1085 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1086 break;
1087 }
1088
1089 out:
1090 return event;
1091 }
1092
1093 static void
mesh_process_plink_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,struct ieee802_11_elems * elems,struct ieee80211_rx_status * rx_status)1094 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1095 struct ieee80211_mgmt *mgmt,
1096 struct ieee802_11_elems *elems,
1097 struct ieee80211_rx_status *rx_status)
1098 {
1099
1100 struct sta_info *sta;
1101 enum plink_event event;
1102 enum ieee80211_self_protected_actioncode ftype;
1103 u32 changed = 0;
1104 u8 ie_len = elems->peering_len;
1105 u16 plid, llid = 0;
1106
1107 if (!elems->peering) {
1108 mpl_dbg(sdata,
1109 "Mesh plink: missing necessary peer link ie\n");
1110 return;
1111 }
1112
1113 if (elems->rsn_len &&
1114 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1115 mpl_dbg(sdata,
1116 "Mesh plink: can't establish link with secure peer\n");
1117 return;
1118 }
1119
1120 ftype = mgmt->u.action.u.self_prot.action_code;
1121 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1122 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1123 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1124 && ie_len != 8)) {
1125 mpl_dbg(sdata,
1126 "Mesh plink: incorrect plink ie length %d %d\n",
1127 ftype, ie_len);
1128 return;
1129 }
1130
1131 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1132 (!elems->mesh_id || !elems->mesh_config)) {
1133 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1134 return;
1135 }
1136 /* Note the lines below are correct, the llid in the frame is the plid
1137 * from the point of view of this host.
1138 */
1139 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1140 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1141 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1142 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1143
1144 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1145 rcu_read_lock();
1146
1147 sta = sta_info_get(sdata, mgmt->sa);
1148
1149 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1150 !rssi_threshold_check(sdata, sta)) {
1151 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1152 mgmt->sa);
1153 goto unlock_rcu;
1154 }
1155
1156 /* Now we will figure out the appropriate event... */
1157 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1158
1159 if (event == OPN_ACPT) {
1160 rcu_read_unlock();
1161 /* allocate sta entry if necessary and update info */
1162 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
1163 if (!sta) {
1164 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1165 goto unlock_rcu;
1166 }
1167 sta->mesh->plid = plid;
1168 } else if (!sta && event == OPN_RJCT) {
1169 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1170 mgmt->sa, 0, plid,
1171 WLAN_REASON_MESH_CONFIG);
1172 goto unlock_rcu;
1173 } else if (!sta || event == PLINK_UNDEFINED) {
1174 /* something went wrong */
1175 goto unlock_rcu;
1176 }
1177
1178 if (event == CNF_ACPT) {
1179 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1180 if (!sta->mesh->plid)
1181 sta->mesh->plid = plid;
1182
1183 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1184 }
1185
1186 changed |= mesh_plink_fsm(sdata, sta, event);
1187
1188 unlock_rcu:
1189 rcu_read_unlock();
1190
1191 if (changed)
1192 ieee80211_mbss_info_change_notify(sdata, changed);
1193 }
1194
mesh_rx_plink_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1195 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1196 struct ieee80211_mgmt *mgmt, size_t len,
1197 struct ieee80211_rx_status *rx_status)
1198 {
1199 struct ieee802_11_elems elems;
1200 size_t baselen;
1201 u8 *baseaddr;
1202
1203 /* need action_code, aux */
1204 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1205 return;
1206
1207 if (sdata->u.mesh.user_mpm)
1208 /* userspace must register for these */
1209 return;
1210
1211 if (is_multicast_ether_addr(mgmt->da)) {
1212 mpl_dbg(sdata,
1213 "Mesh plink: ignore frame from multicast address\n");
1214 return;
1215 }
1216
1217 baseaddr = mgmt->u.action.u.self_prot.variable;
1218 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1219 if (mgmt->u.action.u.self_prot.action_code ==
1220 WLAN_SP_MESH_PEERING_CONFIRM) {
1221 baseaddr += 4;
1222 baselen += 4;
1223
1224 if (baselen > len)
1225 return;
1226 }
1227 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems,
1228 mgmt->bssid, NULL);
1229 mesh_process_plink_frame(sdata, mgmt, &elems, rx_status);
1230 }
1231