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1/*
2 * Copyright (c) 2008, 2009 open80211s Ltd.
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 */
9#include <linux/gfp.h>
10#include <linux/kernel.h>
11#include <linux/random.h>
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
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
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
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 ||
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 */
75static 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 */
93static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
94{
95 struct ieee80211_local *local = sdata->local;
96 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
97 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
98 struct sta_info *sta;
99 u32 erp_rates = 0, changed = 0;
100 int i;
101 bool short_slot = false;
102
103 if (band == NL80211_BAND_5GHZ) {
104 /* (IEEE 802.11-2012 19.4.5) */
105 short_slot = true;
106 goto out;
107 } else if (band != NL80211_BAND_2GHZ)
108 goto out;
109
110 for (i = 0; i < sband->n_bitrates; i++)
111 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
112 erp_rates |= BIT(i);
113
114 if (!erp_rates)
115 goto out;
116
117 rcu_read_lock();
118 list_for_each_entry_rcu(sta, &local->sta_list, list) {
119 if (sdata != sta->sdata ||
120 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
121 continue;
122
123 short_slot = false;
124 if (erp_rates & sta->sta.supp_rates[band])
125 short_slot = true;
126 else
127 break;
128 }
129 rcu_read_unlock();
130
131out:
132 if (sdata->vif.bss_conf.use_short_slot != short_slot) {
133 sdata->vif.bss_conf.use_short_slot = short_slot;
134 changed = BSS_CHANGED_ERP_SLOT;
135 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
136 sdata->vif.addr, short_slot);
137 }
138 return changed;
139}
140
141/**
142 * mesh_set_ht_prot_mode - set correct HT protection mode
143 *
144 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
145 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
146 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
147 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
148 * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
149 * HT20 peer is present. Otherwise no-protection mode is selected.
150 */
151static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
152{
153 struct ieee80211_local *local = sdata->local;
154 struct sta_info *sta;
155 u16 ht_opmode;
156 bool non_ht_sta = false, ht20_sta = false;
157
158 switch (sdata->vif.bss_conf.chandef.width) {
159 case NL80211_CHAN_WIDTH_20_NOHT:
160 case NL80211_CHAN_WIDTH_5:
161 case NL80211_CHAN_WIDTH_10:
162 return 0;
163 default:
164 break;
165 }
166
167 rcu_read_lock();
168 list_for_each_entry_rcu(sta, &local->sta_list, list) {
169 if (sdata != sta->sdata ||
170 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
171 continue;
172
173 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
174 continue;
175
176 if (!sta->sta.ht_cap.ht_supported) {
177 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
178 sta->sta.addr);
179 non_ht_sta = true;
180 break;
181 }
182
183 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
184 ht20_sta = true;
185 }
186 rcu_read_unlock();
187
188 if (non_ht_sta)
189 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
190 else if (ht20_sta &&
191 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
192 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
193 else
194 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
195
196 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
197 return 0;
198
199 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
200 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
201 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
202 return BSS_CHANGED_HT;
203}
204
205static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
206 struct sta_info *sta,
207 enum ieee80211_self_protected_actioncode action,
208 u8 *da, u16 llid, u16 plid, u16 reason)
209{
210 struct ieee80211_local *local = sdata->local;
211 struct sk_buff *skb;
212 struct ieee80211_tx_info *info;
213 struct ieee80211_mgmt *mgmt;
214 bool include_plid = false;
215 u16 peering_proto = 0;
216 u8 *pos, ie_len = 4;
217 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
218 sizeof(mgmt->u.action.u.self_prot);
219 int err = -ENOMEM;
220
221 skb = dev_alloc_skb(local->tx_headroom +
222 hdr_len +
223 2 + /* capability info */
224 2 + /* AID */
225 2 + 8 + /* supported rates */
226 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
227 2 + sdata->u.mesh.mesh_id_len +
228 2 + sizeof(struct ieee80211_meshconf_ie) +
229 2 + sizeof(struct ieee80211_ht_cap) +
230 2 + sizeof(struct ieee80211_ht_operation) +
231 2 + sizeof(struct ieee80211_vht_cap) +
232 2 + sizeof(struct ieee80211_vht_operation) +
233 2 + 8 + /* peering IE */
234 sdata->u.mesh.ie_len);
235 if (!skb)
236 return err;
237 info = IEEE80211_SKB_CB(skb);
238 skb_reserve(skb, local->tx_headroom);
239 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
240 memset(mgmt, 0, hdr_len);
241 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
242 IEEE80211_STYPE_ACTION);
243 memcpy(mgmt->da, da, ETH_ALEN);
244 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
245 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
246 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
247 mgmt->u.action.u.self_prot.action_code = action;
248
249 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
250 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
251
252 /* capability info */
253 pos = skb_put(skb, 2);
254 memset(pos, 0, 2);
255 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
256 /* AID */
257 pos = skb_put(skb, 2);
258 put_unaligned_le16(sta->sta.aid, pos);
259 }
260 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
261 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
262 mesh_add_rsn_ie(sdata, skb) ||
263 mesh_add_meshid_ie(sdata, skb) ||
264 mesh_add_meshconf_ie(sdata, skb))
265 goto free;
266 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
267 info->flags |= IEEE80211_TX_CTL_NO_ACK;
268 if (mesh_add_meshid_ie(sdata, skb))
269 goto free;
270 }
271
272 /* Add Mesh Peering Management element */
273 switch (action) {
274 case WLAN_SP_MESH_PEERING_OPEN:
275 break;
276 case WLAN_SP_MESH_PEERING_CONFIRM:
277 ie_len += 2;
278 include_plid = true;
279 break;
280 case WLAN_SP_MESH_PEERING_CLOSE:
281 if (plid) {
282 ie_len += 2;
283 include_plid = true;
284 }
285 ie_len += 2; /* reason code */
286 break;
287 default:
288 err = -EINVAL;
289 goto free;
290 }
291
292 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
293 goto free;
294
295 pos = skb_put(skb, 2 + ie_len);
296 *pos++ = WLAN_EID_PEER_MGMT;
297 *pos++ = ie_len;
298 memcpy(pos, &peering_proto, 2);
299 pos += 2;
300 put_unaligned_le16(llid, pos);
301 pos += 2;
302 if (include_plid) {
303 put_unaligned_le16(plid, pos);
304 pos += 2;
305 }
306 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
307 put_unaligned_le16(reason, pos);
308 pos += 2;
309 }
310
311 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
312 if (mesh_add_ht_cap_ie(sdata, skb) ||
313 mesh_add_ht_oper_ie(sdata, skb) ||
314 mesh_add_vht_cap_ie(sdata, skb) ||
315 mesh_add_vht_oper_ie(sdata, skb))
316 goto free;
317 }
318
319 if (mesh_add_vendor_ies(sdata, skb))
320 goto free;
321
322 ieee80211_tx_skb(sdata, skb);
323 return 0;
324free:
325 kfree_skb(skb);
326 return err;
327}
328
329/**
330 * __mesh_plink_deactivate - deactivate mesh peer link
331 *
332 * @sta: mesh peer link to deactivate
333 *
334 * Mesh paths with this peer as next hop should be flushed
335 * by the caller outside of plink_lock.
336 *
337 * Returns beacon changed flag if the beacon content changed.
338 *
339 * Locking: the caller must hold sta->mesh->plink_lock
340 */
341static u32 __mesh_plink_deactivate(struct sta_info *sta)
342{
343 struct ieee80211_sub_if_data *sdata = sta->sdata;
344 u32 changed = 0;
345
346 lockdep_assert_held(&sta->mesh->plink_lock);
347
348 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
349 changed = mesh_plink_dec_estab_count(sdata);
350 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
351
352 ieee80211_mps_sta_status_update(sta);
353 changed |= ieee80211_mps_set_sta_local_pm(sta,
354 NL80211_MESH_POWER_UNKNOWN);
355
356 return changed;
357}
358
359/**
360 * mesh_plink_deactivate - deactivate mesh peer link
361 *
362 * @sta: mesh peer link to deactivate
363 *
364 * All mesh paths with this peer as next hop will be flushed
365 */
366u32 mesh_plink_deactivate(struct sta_info *sta)
367{
368 struct ieee80211_sub_if_data *sdata = sta->sdata;
369 u32 changed;
370
371 spin_lock_bh(&sta->mesh->plink_lock);
372 changed = __mesh_plink_deactivate(sta);
373
374 if (!sdata->u.mesh.user_mpm) {
375 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
376 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
377 sta->sta.addr, sta->mesh->llid,
378 sta->mesh->plid, sta->mesh->reason);
379 }
380 spin_unlock_bh(&sta->mesh->plink_lock);
381 if (!sdata->u.mesh.user_mpm)
382 del_timer_sync(&sta->mesh->plink_timer);
383 mesh_path_flush_by_nexthop(sta);
384
385 /* make sure no readers can access nexthop sta from here on */
386 synchronize_net();
387
388 return changed;
389}
390
391static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
392 struct sta_info *sta,
393 struct ieee802_11_elems *elems, bool insert)
394{
395 struct ieee80211_local *local = sdata->local;
396 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
397 struct ieee80211_supported_band *sband;
398 u32 rates, basic_rates = 0, changed = 0;
399 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
400
401 sband = local->hw.wiphy->bands[band];
402 rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
403
404 spin_lock_bh(&sta->mesh->plink_lock);
405 sta->rx_stats.last_rx = jiffies;
406
407 /* rates and capabilities don't change during peering */
408 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
409 sta->mesh->processed_beacon)
410 goto out;
411 sta->mesh->processed_beacon = true;
412
413 if (sta->sta.supp_rates[band] != rates)
414 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
415 sta->sta.supp_rates[band] = rates;
416
417 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
418 elems->ht_cap_elem, sta))
419 changed |= IEEE80211_RC_BW_CHANGED;
420
421 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
422 elems->vht_cap_elem, sta);
423
424 if (bw != sta->sta.bandwidth)
425 changed |= IEEE80211_RC_BW_CHANGED;
426
427 /* HT peer is operating 20MHz-only */
428 if (elems->ht_operation &&
429 !(elems->ht_operation->ht_param &
430 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
431 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
432 changed |= IEEE80211_RC_BW_CHANGED;
433 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
434 }
435
436 if (insert)
437 rate_control_rate_init(sta);
438 else
439 rate_control_rate_update(local, sband, sta, changed);
440out:
441 spin_unlock_bh(&sta->mesh->plink_lock);
442}
443
444static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
445{
446 struct sta_info *sta;
447 unsigned long *aid_map;
448 int aid;
449
450 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
451 sizeof(*aid_map), GFP_KERNEL);
452 if (!aid_map)
453 return -ENOMEM;
454
455 /* reserve aid 0 for mcast indication */
456 __set_bit(0, aid_map);
457
458 rcu_read_lock();
459 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
460 __set_bit(sta->sta.aid, aid_map);
461 rcu_read_unlock();
462
463 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
464 kfree(aid_map);
465
466 if (aid > IEEE80211_MAX_AID)
467 return -ENOBUFS;
468
469 return aid;
470}
471
472static struct sta_info *
473__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
474{
475 struct sta_info *sta;
476 int aid;
477
478 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
479 return NULL;
480
481 aid = mesh_allocate_aid(sdata);
482 if (aid < 0)
483 return NULL;
484
485 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
486 if (!sta)
487 return NULL;
488
489 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
490 sta->sta.wme = true;
491 sta->sta.aid = aid;
492
493 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
494 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
495 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
496
497 return sta;
498}
499
500static struct sta_info *
501mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
502 struct ieee802_11_elems *elems)
503{
504 struct sta_info *sta = NULL;
505
506 /* Userspace handles station allocation */
507 if (sdata->u.mesh.user_mpm ||
508 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
509 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
510 elems->ie_start,
511 elems->total_len,
512 GFP_KERNEL);
513 else
514 sta = __mesh_sta_info_alloc(sdata, addr);
515
516 return sta;
517}
518
519/*
520 * mesh_sta_info_get - return mesh sta info entry for @addr.
521 *
522 * @sdata: local meshif
523 * @addr: peer's address
524 * @elems: IEs from beacon or mesh peering frame.
525 *
526 * Return existing or newly allocated sta_info under RCU read lock.
527 * (re)initialize with given IEs.
528 */
529static struct sta_info *
530mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
531 u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
532{
533 struct sta_info *sta = NULL;
534
535 rcu_read_lock();
536 sta = sta_info_get(sdata, addr);
537 if (sta) {
538 mesh_sta_info_init(sdata, sta, elems, false);
539 } else {
540 rcu_read_unlock();
541 /* can't run atomic */
542 sta = mesh_sta_info_alloc(sdata, addr, elems);
543 if (!sta) {
544 rcu_read_lock();
545 return NULL;
546 }
547
548 mesh_sta_info_init(sdata, sta, elems, true);
549
550 if (sta_info_insert_rcu(sta))
551 return NULL;
552 }
553
554 return sta;
555}
556
557/*
558 * mesh_neighbour_update - update or initialize new mesh neighbor.
559 *
560 * @sdata: local meshif
561 * @addr: peer's address
562 * @elems: IEs from beacon or mesh peering frame
563 *
564 * Initiates peering if appropriate.
565 */
566void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
567 u8 *hw_addr,
568 struct ieee802_11_elems *elems)
569{
570 struct sta_info *sta;
571 u32 changed = 0;
572
573 sta = mesh_sta_info_get(sdata, hw_addr, elems);
574 if (!sta)
575 goto out;
576
577 if (mesh_peer_accepts_plinks(elems) &&
578 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
579 sdata->u.mesh.accepting_plinks &&
580 sdata->u.mesh.mshcfg.auto_open_plinks &&
581 rssi_threshold_check(sdata, sta))
582 changed = mesh_plink_open(sta);
583
584 ieee80211_mps_frame_release(sta, elems);
585out:
586 rcu_read_unlock();
587 ieee80211_mbss_info_change_notify(sdata, changed);
588}
589
590static void mesh_plink_timer(unsigned long data)
591{
592 struct sta_info *sta;
593 u16 reason = 0;
594 struct ieee80211_sub_if_data *sdata;
595 struct mesh_config *mshcfg;
596 enum ieee80211_self_protected_actioncode action = 0;
597
598 /*
599 * This STA is valid because sta_info_destroy() will
600 * del_timer_sync() this timer after having made sure
601 * it cannot be readded (by deleting the plink.)
602 */
603 sta = (struct sta_info *) data;
604
605 if (sta->sdata->local->quiescing)
606 return;
607
608 spin_lock_bh(&sta->mesh->plink_lock);
609
610 /* If a timer fires just before a state transition on another CPU,
611 * we may have already extended the timeout and changed state by the
612 * time we've acquired the lock and arrived here. In that case,
613 * skip this timer and wait for the new one.
614 */
615 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
616 mpl_dbg(sta->sdata,
617 "Ignoring timer for %pM in state %s (timer adjusted)",
618 sta->sta.addr, mplstates[sta->mesh->plink_state]);
619 spin_unlock_bh(&sta->mesh->plink_lock);
620 return;
621 }
622
623 /* del_timer() and handler may race when entering these states */
624 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
625 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
626 mpl_dbg(sta->sdata,
627 "Ignoring timer for %pM in state %s (timer deleted)",
628 sta->sta.addr, mplstates[sta->mesh->plink_state]);
629 spin_unlock_bh(&sta->mesh->plink_lock);
630 return;
631 }
632
633 mpl_dbg(sta->sdata,
634 "Mesh plink timer for %pM fired on state %s\n",
635 sta->sta.addr, mplstates[sta->mesh->plink_state]);
636 sdata = sta->sdata;
637 mshcfg = &sdata->u.mesh.mshcfg;
638
639 switch (sta->mesh->plink_state) {
640 case NL80211_PLINK_OPN_RCVD:
641 case NL80211_PLINK_OPN_SNT:
642 /* retry timer */
643 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
644 u32 rand;
645 mpl_dbg(sta->sdata,
646 "Mesh plink for %pM (retry, timeout): %d %d\n",
647 sta->sta.addr, sta->mesh->plink_retries,
648 sta->mesh->plink_timeout);
649 get_random_bytes(&rand, sizeof(u32));
650 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
651 rand % sta->mesh->plink_timeout;
652 ++sta->mesh->plink_retries;
653 mod_plink_timer(sta, sta->mesh->plink_timeout);
654 action = WLAN_SP_MESH_PEERING_OPEN;
655 break;
656 }
657 reason = WLAN_REASON_MESH_MAX_RETRIES;
658 /* fall through on else */
659 case NL80211_PLINK_CNF_RCVD:
660 /* confirm timer */
661 if (!reason)
662 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
663 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
664 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
665 action = WLAN_SP_MESH_PEERING_CLOSE;
666 break;
667 case NL80211_PLINK_HOLDING:
668 /* holding timer */
669 del_timer(&sta->mesh->plink_timer);
670 mesh_plink_fsm_restart(sta);
671 break;
672 default:
673 break;
674 }
675 spin_unlock_bh(&sta->mesh->plink_lock);
676 if (action)
677 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
678 sta->mesh->llid, sta->mesh->plid, reason);
679}
680
681static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
682{
683 sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
684 sta->mesh->plink_timer.data = (unsigned long) sta;
685 sta->mesh->plink_timer.function = mesh_plink_timer;
686 sta->mesh->plink_timeout = timeout;
687 add_timer(&sta->mesh->plink_timer);
688}
689
690static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
691 u16 llid)
692{
693 struct ieee80211_local *local = sdata->local;
694 bool in_use = false;
695 struct sta_info *sta;
696
697 rcu_read_lock();
698 list_for_each_entry_rcu(sta, &local->sta_list, list) {
699 if (sdata != sta->sdata)
700 continue;
701
702 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
703 in_use = true;
704 break;
705 }
706 }
707 rcu_read_unlock();
708
709 return in_use;
710}
711
712static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
713{
714 u16 llid;
715
716 do {
717 get_random_bytes(&llid, sizeof(llid));
718 } while (llid_in_use(sdata, llid));
719
720 return llid;
721}
722
723u32 mesh_plink_open(struct sta_info *sta)
724{
725 struct ieee80211_sub_if_data *sdata = sta->sdata;
726 u32 changed;
727
728 if (!test_sta_flag(sta, WLAN_STA_AUTH))
729 return 0;
730
731 spin_lock_bh(&sta->mesh->plink_lock);
732 sta->mesh->llid = mesh_get_new_llid(sdata);
733 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
734 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
735 spin_unlock_bh(&sta->mesh->plink_lock);
736 return 0;
737 }
738 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
739 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
740 spin_unlock_bh(&sta->mesh->plink_lock);
741 mpl_dbg(sdata,
742 "Mesh plink: starting establishment with %pM\n",
743 sta->sta.addr);
744
745 /* set the non-peer mode to active during peering */
746 changed = ieee80211_mps_local_status_update(sdata);
747
748 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
749 sta->sta.addr, sta->mesh->llid, 0, 0);
750 return changed;
751}
752
753u32 mesh_plink_block(struct sta_info *sta)
754{
755 u32 changed;
756
757 spin_lock_bh(&sta->mesh->plink_lock);
758 changed = __mesh_plink_deactivate(sta);
759 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
760 spin_unlock_bh(&sta->mesh->plink_lock);
761 mesh_path_flush_by_nexthop(sta);
762
763 return changed;
764}
765
766static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
767 struct sta_info *sta,
768 enum plink_event event)
769{
770 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
771 u16 reason = (event == CLS_ACPT) ?
772 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
773
774 sta->mesh->reason = reason;
775 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
776 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
777}
778
779static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
780 struct sta_info *sta)
781{
782 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
783 u32 changed = 0;
784
785 del_timer(&sta->mesh->plink_timer);
786 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
787 changed |= mesh_plink_inc_estab_count(sdata);
788 changed |= mesh_set_ht_prot_mode(sdata);
789 changed |= mesh_set_short_slot_time(sdata);
790 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
791 ieee80211_mps_sta_status_update(sta);
792 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
793 return changed;
794}
795
796/**
797 * mesh_plink_fsm - step @sta MPM based on @event
798 *
799 * @sdata: interface
800 * @sta: mesh neighbor
801 * @event: peering event
802 *
803 * Return: changed MBSS flags
804 */
805static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
806 struct sta_info *sta, enum plink_event event)
807{
808 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
809 enum ieee80211_self_protected_actioncode action = 0;
810 u32 changed = 0;
811 bool flush = false;
812
813 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
814 mplstates[sta->mesh->plink_state], mplevents[event]);
815
816 spin_lock_bh(&sta->mesh->plink_lock);
817 switch (sta->mesh->plink_state) {
818 case NL80211_PLINK_LISTEN:
819 switch (event) {
820 case CLS_ACPT:
821 mesh_plink_fsm_restart(sta);
822 break;
823 case OPN_ACPT:
824 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
825 sta->mesh->llid = mesh_get_new_llid(sdata);
826 mesh_plink_timer_set(sta,
827 mshcfg->dot11MeshRetryTimeout);
828
829 /* set the non-peer mode to active during peering */
830 changed |= ieee80211_mps_local_status_update(sdata);
831 action = WLAN_SP_MESH_PEERING_OPEN;
832 break;
833 default:
834 break;
835 }
836 break;
837 case NL80211_PLINK_OPN_SNT:
838 switch (event) {
839 case OPN_RJCT:
840 case CNF_RJCT:
841 case CLS_ACPT:
842 mesh_plink_close(sdata, sta, event);
843 action = WLAN_SP_MESH_PEERING_CLOSE;
844 break;
845 case OPN_ACPT:
846 /* retry timer is left untouched */
847 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
848 action = WLAN_SP_MESH_PEERING_CONFIRM;
849 break;
850 case CNF_ACPT:
851 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
852 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
853 break;
854 default:
855 break;
856 }
857 break;
858 case NL80211_PLINK_OPN_RCVD:
859 switch (event) {
860 case OPN_RJCT:
861 case CNF_RJCT:
862 case CLS_ACPT:
863 mesh_plink_close(sdata, sta, event);
864 action = WLAN_SP_MESH_PEERING_CLOSE;
865 break;
866 case OPN_ACPT:
867 action = WLAN_SP_MESH_PEERING_CONFIRM;
868 break;
869 case CNF_ACPT:
870 changed |= mesh_plink_establish(sdata, sta);
871 break;
872 default:
873 break;
874 }
875 break;
876 case NL80211_PLINK_CNF_RCVD:
877 switch (event) {
878 case OPN_RJCT:
879 case CNF_RJCT:
880 case CLS_ACPT:
881 mesh_plink_close(sdata, sta, event);
882 action = WLAN_SP_MESH_PEERING_CLOSE;
883 break;
884 case OPN_ACPT:
885 changed |= mesh_plink_establish(sdata, sta);
886 action = WLAN_SP_MESH_PEERING_CONFIRM;
887 break;
888 default:
889 break;
890 }
891 break;
892 case NL80211_PLINK_ESTAB:
893 switch (event) {
894 case CLS_ACPT:
895 changed |= __mesh_plink_deactivate(sta);
896 changed |= mesh_set_ht_prot_mode(sdata);
897 changed |= mesh_set_short_slot_time(sdata);
898 mesh_plink_close(sdata, sta, event);
899 action = WLAN_SP_MESH_PEERING_CLOSE;
900 flush = true;
901 break;
902 case OPN_ACPT:
903 action = WLAN_SP_MESH_PEERING_CONFIRM;
904 break;
905 default:
906 break;
907 }
908 break;
909 case NL80211_PLINK_HOLDING:
910 switch (event) {
911 case CLS_ACPT:
912 del_timer(&sta->mesh->plink_timer);
913 mesh_plink_fsm_restart(sta);
914 break;
915 case OPN_ACPT:
916 case CNF_ACPT:
917 case OPN_RJCT:
918 case CNF_RJCT:
919 action = WLAN_SP_MESH_PEERING_CLOSE;
920 break;
921 default:
922 break;
923 }
924 break;
925 default:
926 /* should not get here, PLINK_BLOCKED is dealt with at the
927 * beginning of the function
928 */
929 break;
930 }
931 spin_unlock_bh(&sta->mesh->plink_lock);
932 if (flush)
933 mesh_path_flush_by_nexthop(sta);
934 if (action) {
935 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
936 sta->mesh->llid, sta->mesh->plid,
937 sta->mesh->reason);
938
939 /* also send confirm in open case */
940 if (action == WLAN_SP_MESH_PEERING_OPEN) {
941 mesh_plink_frame_tx(sdata, sta,
942 WLAN_SP_MESH_PEERING_CONFIRM,
943 sta->sta.addr, sta->mesh->llid,
944 sta->mesh->plid, 0);
945 }
946 }
947
948 return changed;
949}
950
951/*
952 * mesh_plink_get_event - get correct MPM event
953 *
954 * @sdata: interface
955 * @sta: peer, leave NULL if processing a frame from a new suitable peer
956 * @elems: peering management IEs
957 * @ftype: frame type
958 * @llid: peer's peer link ID
959 * @plid: peer's local link ID
960 *
961 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
962 * an error.
963 */
964static enum plink_event
965mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
966 struct sta_info *sta,
967 struct ieee802_11_elems *elems,
968 enum ieee80211_self_protected_actioncode ftype,
969 u16 llid, u16 plid)
970{
971 enum plink_event event = PLINK_UNDEFINED;
972 u8 ie_len = elems->peering_len;
973 bool matches_local;
974
975 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
976 mesh_matches_local(sdata, elems));
977
978 /* deny open request from non-matching peer */
979 if (!matches_local && !sta) {
980 event = OPN_RJCT;
981 goto out;
982 }
983
984 if (!sta) {
985 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
986 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
987 goto out;
988 }
989 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
990 if (!mesh_plink_free_count(sdata)) {
991 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
992 goto out;
993 }
994
995 /* new matching peer */
996 event = OPN_ACPT;
997 goto out;
998 } else {
999 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1000 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1001 goto out;
1002 }
1003 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1004 goto out;
1005 }
1006
1007 switch (ftype) {
1008 case WLAN_SP_MESH_PEERING_OPEN:
1009 if (!matches_local)
1010 event = OPN_RJCT;
1011 if (!mesh_plink_free_count(sdata) ||
1012 (sta->mesh->plid && sta->mesh->plid != plid))
1013 event = OPN_IGNR;
1014 else
1015 event = OPN_ACPT;
1016 break;
1017 case WLAN_SP_MESH_PEERING_CONFIRM:
1018 if (!matches_local)
1019 event = CNF_RJCT;
1020 if (!mesh_plink_free_count(sdata) ||
1021 sta->mesh->llid != llid ||
1022 (sta->mesh->plid && sta->mesh->plid != plid))
1023 event = CNF_IGNR;
1024 else
1025 event = CNF_ACPT;
1026 break;
1027 case WLAN_SP_MESH_PEERING_CLOSE:
1028 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1029 /* Do not check for llid or plid. This does not
1030 * follow the standard but since multiple plinks
1031 * per sta are not supported, it is necessary in
1032 * order to avoid a livelock when MP A sees an
1033 * establish peer link to MP B but MP B does not
1034 * see it. This can be caused by a timeout in
1035 * B's peer link establishment or B beign
1036 * restarted.
1037 */
1038 event = CLS_ACPT;
1039 else if (sta->mesh->plid != plid)
1040 event = CLS_IGNR;
1041 else if (ie_len == 8 && sta->mesh->llid != llid)
1042 event = CLS_IGNR;
1043 else
1044 event = CLS_ACPT;
1045 break;
1046 default:
1047 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1048 break;
1049 }
1050
1051out:
1052 return event;
1053}
1054
1055static void
1056mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1057 struct ieee80211_mgmt *mgmt,
1058 struct ieee802_11_elems *elems)
1059{
1060
1061 struct sta_info *sta;
1062 enum plink_event event;
1063 enum ieee80211_self_protected_actioncode ftype;
1064 u32 changed = 0;
1065 u8 ie_len = elems->peering_len;
1066 u16 plid, llid = 0;
1067
1068 if (!elems->peering) {
1069 mpl_dbg(sdata,
1070 "Mesh plink: missing necessary peer link ie\n");
1071 return;
1072 }
1073
1074 if (elems->rsn_len &&
1075 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1076 mpl_dbg(sdata,
1077 "Mesh plink: can't establish link with secure peer\n");
1078 return;
1079 }
1080
1081 ftype = mgmt->u.action.u.self_prot.action_code;
1082 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1083 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1084 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1085 && ie_len != 8)) {
1086 mpl_dbg(sdata,
1087 "Mesh plink: incorrect plink ie length %d %d\n",
1088 ftype, ie_len);
1089 return;
1090 }
1091
1092 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1093 (!elems->mesh_id || !elems->mesh_config)) {
1094 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1095 return;
1096 }
1097 /* Note the lines below are correct, the llid in the frame is the plid
1098 * from the point of view of this host.
1099 */
1100 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1101 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1102 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1103 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1104
1105 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1106 rcu_read_lock();
1107
1108 sta = sta_info_get(sdata, mgmt->sa);
1109
1110 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1111 !rssi_threshold_check(sdata, sta)) {
1112 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1113 mgmt->sa);
1114 goto unlock_rcu;
1115 }
1116
1117 /* Now we will figure out the appropriate event... */
1118 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1119
1120 if (event == OPN_ACPT) {
1121 rcu_read_unlock();
1122 /* allocate sta entry if necessary and update info */
1123 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
1124 if (!sta) {
1125 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1126 goto unlock_rcu;
1127 }
1128 sta->mesh->plid = plid;
1129 } else if (!sta && event == OPN_RJCT) {
1130 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1131 mgmt->sa, 0, plid,
1132 WLAN_REASON_MESH_CONFIG);
1133 goto unlock_rcu;
1134 } else if (!sta || event == PLINK_UNDEFINED) {
1135 /* something went wrong */
1136 goto unlock_rcu;
1137 }
1138
1139 if (event == CNF_ACPT) {
1140 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1141 if (!sta->mesh->plid)
1142 sta->mesh->plid = plid;
1143
1144 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1145 }
1146
1147 changed |= mesh_plink_fsm(sdata, sta, event);
1148
1149unlock_rcu:
1150 rcu_read_unlock();
1151
1152 if (changed)
1153 ieee80211_mbss_info_change_notify(sdata, changed);
1154}
1155
1156void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1157 struct ieee80211_mgmt *mgmt, size_t len,
1158 struct ieee80211_rx_status *rx_status)
1159{
1160 struct ieee802_11_elems elems;
1161 size_t baselen;
1162 u8 *baseaddr;
1163
1164 /* need action_code, aux */
1165 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1166 return;
1167
1168 if (sdata->u.mesh.user_mpm)
1169 /* userspace must register for these */
1170 return;
1171
1172 if (is_multicast_ether_addr(mgmt->da)) {
1173 mpl_dbg(sdata,
1174 "Mesh plink: ignore frame from multicast address\n");
1175 return;
1176 }
1177
1178 baseaddr = mgmt->u.action.u.self_prot.variable;
1179 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1180 if (mgmt->u.action.u.self_prot.action_code ==
1181 WLAN_SP_MESH_PEERING_CONFIRM) {
1182 baseaddr += 4;
1183 baselen += 4;
1184
1185 if (baselen > len)
1186 return;
1187 }
1188 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1189 mesh_process_plink_frame(sdata, mgmt, &elems);
1190}
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
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
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
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 ||
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 */
75static 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 */
93static 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
135out:
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 * @sdata: the (mesh) interface to handle
148 *
149 * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
150 * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
151 * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
152 * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
153 * is selected if all peers in our 20/40MHz MBSS support HT and at least one
154 * HT20 peer is present. Otherwise no-protection mode is selected.
155 */
156static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
157{
158 struct ieee80211_local *local = sdata->local;
159 struct sta_info *sta;
160 u16 ht_opmode;
161 bool non_ht_sta = false, ht20_sta = false;
162
163 switch (sdata->vif.bss_conf.chandef.width) {
164 case NL80211_CHAN_WIDTH_20_NOHT:
165 case NL80211_CHAN_WIDTH_5:
166 case NL80211_CHAN_WIDTH_10:
167 return 0;
168 default:
169 break;
170 }
171
172 rcu_read_lock();
173 list_for_each_entry_rcu(sta, &local->sta_list, list) {
174 if (sdata != sta->sdata ||
175 sta->mesh->plink_state != NL80211_PLINK_ESTAB)
176 continue;
177
178 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
179 continue;
180
181 if (!sta->sta.ht_cap.ht_supported) {
182 mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
183 sta->sta.addr);
184 non_ht_sta = true;
185 break;
186 }
187
188 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
189 ht20_sta = true;
190 }
191 rcu_read_unlock();
192
193 if (non_ht_sta)
194 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
195 else if (ht20_sta &&
196 sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
197 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
198 else
199 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
200
201 if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
202 return 0;
203
204 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
205 sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
206 mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
207 return BSS_CHANGED_HT;
208}
209
210static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
211 struct sta_info *sta,
212 enum ieee80211_self_protected_actioncode action,
213 u8 *da, u16 llid, u16 plid, u16 reason)
214{
215 struct ieee80211_local *local = sdata->local;
216 struct sk_buff *skb;
217 struct ieee80211_tx_info *info;
218 struct ieee80211_mgmt *mgmt;
219 bool include_plid = false;
220 u16 peering_proto = 0;
221 u8 *pos, ie_len = 4;
222 u8 ie_len_he_cap;
223 int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
224 int err = -ENOMEM;
225
226 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
227 NL80211_IFTYPE_MESH_POINT);
228 skb = dev_alloc_skb(local->tx_headroom +
229 hdr_len +
230 2 + /* capability info */
231 2 + /* AID */
232 2 + 8 + /* supported rates */
233 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
234 2 + sdata->u.mesh.mesh_id_len +
235 2 + sizeof(struct ieee80211_meshconf_ie) +
236 2 + sizeof(struct ieee80211_ht_cap) +
237 2 + sizeof(struct ieee80211_ht_operation) +
238 2 + sizeof(struct ieee80211_vht_cap) +
239 2 + sizeof(struct ieee80211_vht_operation) +
240 ie_len_he_cap +
241 2 + 1 + sizeof(struct ieee80211_he_operation) +
242 sizeof(struct ieee80211_he_6ghz_oper) +
243 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
244 2 + 8 + /* peering IE */
245 sdata->u.mesh.ie_len);
246 if (!skb)
247 return err;
248 info = IEEE80211_SKB_CB(skb);
249 skb_reserve(skb, local->tx_headroom);
250 mgmt = skb_put_zero(skb, hdr_len);
251 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
252 IEEE80211_STYPE_ACTION);
253 memcpy(mgmt->da, da, ETH_ALEN);
254 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
255 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
256 mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
257 mgmt->u.action.u.self_prot.action_code = action;
258
259 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
260 struct ieee80211_supported_band *sband;
261 enum nl80211_band band;
262
263 sband = ieee80211_get_sband(sdata);
264 if (!sband) {
265 err = -EINVAL;
266 goto free;
267 }
268 band = sband->band;
269
270 /* capability info */
271 pos = skb_put_zero(skb, 2);
272 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
273 /* AID */
274 pos = skb_put(skb, 2);
275 put_unaligned_le16(sta->sta.aid, pos);
276 }
277 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
278 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
279 mesh_add_rsn_ie(sdata, skb) ||
280 mesh_add_meshid_ie(sdata, skb) ||
281 mesh_add_meshconf_ie(sdata, skb))
282 goto free;
283 } else { /* WLAN_SP_MESH_PEERING_CLOSE */
284 info->flags |= IEEE80211_TX_CTL_NO_ACK;
285 if (mesh_add_meshid_ie(sdata, skb))
286 goto free;
287 }
288
289 /* Add Mesh Peering Management element */
290 switch (action) {
291 case WLAN_SP_MESH_PEERING_OPEN:
292 break;
293 case WLAN_SP_MESH_PEERING_CONFIRM:
294 ie_len += 2;
295 include_plid = true;
296 break;
297 case WLAN_SP_MESH_PEERING_CLOSE:
298 if (plid) {
299 ie_len += 2;
300 include_plid = true;
301 }
302 ie_len += 2; /* reason code */
303 break;
304 default:
305 err = -EINVAL;
306 goto free;
307 }
308
309 if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
310 goto free;
311
312 pos = skb_put(skb, 2 + ie_len);
313 *pos++ = WLAN_EID_PEER_MGMT;
314 *pos++ = ie_len;
315 memcpy(pos, &peering_proto, 2);
316 pos += 2;
317 put_unaligned_le16(llid, pos);
318 pos += 2;
319 if (include_plid) {
320 put_unaligned_le16(plid, pos);
321 pos += 2;
322 }
323 if (action == WLAN_SP_MESH_PEERING_CLOSE) {
324 put_unaligned_le16(reason, pos);
325 pos += 2;
326 }
327
328 if (action != WLAN_SP_MESH_PEERING_CLOSE) {
329 if (mesh_add_ht_cap_ie(sdata, skb) ||
330 mesh_add_ht_oper_ie(sdata, skb) ||
331 mesh_add_vht_cap_ie(sdata, skb) ||
332 mesh_add_vht_oper_ie(sdata, skb) ||
333 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
334 mesh_add_he_oper_ie(sdata, skb) ||
335 mesh_add_he_6ghz_cap_ie(sdata, skb))
336 goto free;
337 }
338
339 if (mesh_add_vendor_ies(sdata, skb))
340 goto free;
341
342 ieee80211_tx_skb(sdata, skb);
343 return 0;
344free:
345 kfree_skb(skb);
346 return err;
347}
348
349/**
350 * __mesh_plink_deactivate - deactivate mesh peer link
351 *
352 * @sta: mesh peer link to deactivate
353 *
354 * Mesh paths with this peer as next hop should be flushed
355 * by the caller outside of plink_lock.
356 *
357 * Returns beacon changed flag if the beacon content changed.
358 *
359 * Locking: the caller must hold sta->mesh->plink_lock
360 */
361static u32 __mesh_plink_deactivate(struct sta_info *sta)
362{
363 struct ieee80211_sub_if_data *sdata = sta->sdata;
364 u32 changed = 0;
365
366 lockdep_assert_held(&sta->mesh->plink_lock);
367
368 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
369 changed = mesh_plink_dec_estab_count(sdata);
370 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
371
372 ieee80211_mps_sta_status_update(sta);
373 changed |= ieee80211_mps_set_sta_local_pm(sta,
374 NL80211_MESH_POWER_UNKNOWN);
375
376 return changed;
377}
378
379/**
380 * mesh_plink_deactivate - deactivate mesh peer link
381 *
382 * @sta: mesh peer link to deactivate
383 *
384 * All mesh paths with this peer as next hop will be flushed
385 */
386u32 mesh_plink_deactivate(struct sta_info *sta)
387{
388 struct ieee80211_sub_if_data *sdata = sta->sdata;
389 u32 changed;
390
391 spin_lock_bh(&sta->mesh->plink_lock);
392 changed = __mesh_plink_deactivate(sta);
393
394 if (!sdata->u.mesh.user_mpm) {
395 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
396 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
397 sta->sta.addr, sta->mesh->llid,
398 sta->mesh->plid, sta->mesh->reason);
399 }
400 spin_unlock_bh(&sta->mesh->plink_lock);
401 if (!sdata->u.mesh.user_mpm)
402 del_timer_sync(&sta->mesh->plink_timer);
403 mesh_path_flush_by_nexthop(sta);
404
405 /* make sure no readers can access nexthop sta from here on */
406 synchronize_net();
407
408 return changed;
409}
410
411static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
412 struct sta_info *sta,
413 struct ieee802_11_elems *elems)
414{
415 struct ieee80211_local *local = sdata->local;
416 struct ieee80211_supported_band *sband;
417 u32 rates, basic_rates = 0, changed = 0;
418 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
419
420 sband = ieee80211_get_sband(sdata);
421 if (!sband)
422 return;
423
424 rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
425 &basic_rates);
426
427 spin_lock_bh(&sta->mesh->plink_lock);
428 sta->rx_stats.last_rx = jiffies;
429
430 /* rates and capabilities don't change during peering */
431 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
432 sta->mesh->processed_beacon)
433 goto out;
434 sta->mesh->processed_beacon = true;
435
436 if (sta->sta.supp_rates[sband->band] != rates)
437 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
438 sta->sta.supp_rates[sband->band] = rates;
439
440 if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
441 elems->ht_cap_elem, sta))
442 changed |= IEEE80211_RC_BW_CHANGED;
443
444 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
445 elems->vht_cap_elem, sta);
446
447 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap,
448 elems->he_cap_len,
449 elems->he_6ghz_capa,
450 sta);
451
452 if (bw != sta->sta.bandwidth)
453 changed |= IEEE80211_RC_BW_CHANGED;
454
455 /* HT peer is operating 20MHz-only */
456 if (elems->ht_operation &&
457 !(elems->ht_operation->ht_param &
458 IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
459 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
460 changed |= IEEE80211_RC_BW_CHANGED;
461 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
462 }
463
464 if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
465 rate_control_rate_init(sta);
466 else
467 rate_control_rate_update(local, sband, sta, changed);
468out:
469 spin_unlock_bh(&sta->mesh->plink_lock);
470}
471
472static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
473{
474 struct sta_info *sta;
475 unsigned long *aid_map;
476 int aid;
477
478 aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
479 sizeof(*aid_map), GFP_KERNEL);
480 if (!aid_map)
481 return -ENOMEM;
482
483 /* reserve aid 0 for mcast indication */
484 __set_bit(0, aid_map);
485
486 rcu_read_lock();
487 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
488 __set_bit(sta->sta.aid, aid_map);
489 rcu_read_unlock();
490
491 aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
492 kfree(aid_map);
493
494 if (aid > IEEE80211_MAX_AID)
495 return -ENOBUFS;
496
497 return aid;
498}
499
500static struct sta_info *
501__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
502{
503 struct sta_info *sta;
504 int aid;
505
506 if (sdata->local->num_sta >= MESH_MAX_PLINKS)
507 return NULL;
508
509 aid = mesh_allocate_aid(sdata);
510 if (aid < 0)
511 return NULL;
512
513 sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
514 if (!sta)
515 return NULL;
516
517 sta->mesh->plink_state = NL80211_PLINK_LISTEN;
518 sta->sta.wme = true;
519 sta->sta.aid = aid;
520
521 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
522 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
523 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
524
525 return sta;
526}
527
528static struct sta_info *
529mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
530 struct ieee802_11_elems *elems,
531 struct ieee80211_rx_status *rx_status)
532{
533 struct sta_info *sta = NULL;
534
535 /* Userspace handles station allocation */
536 if (sdata->u.mesh.user_mpm ||
537 sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
538 if (mesh_peer_accepts_plinks(elems) &&
539 mesh_plink_availables(sdata)) {
540 int sig = 0;
541
542 if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM))
543 sig = rx_status->signal;
544
545 cfg80211_notify_new_peer_candidate(sdata->dev, addr,
546 elems->ie_start,
547 elems->total_len,
548 sig, GFP_KERNEL);
549 }
550 } else
551 sta = __mesh_sta_info_alloc(sdata, addr);
552
553 return sta;
554}
555
556/*
557 * mesh_sta_info_get - return mesh sta info entry for @addr.
558 *
559 * @sdata: local meshif
560 * @addr: peer's address
561 * @elems: IEs from beacon or mesh peering frame.
562 * @rx_status: rx status for the frame for signal reporting
563 *
564 * Return existing or newly allocated sta_info under RCU read lock.
565 * (re)initialize with given IEs.
566 */
567static struct sta_info *
568mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
569 u8 *addr, struct ieee802_11_elems *elems,
570 struct ieee80211_rx_status *rx_status) __acquires(RCU)
571{
572 struct sta_info *sta = NULL;
573
574 rcu_read_lock();
575 sta = sta_info_get(sdata, addr);
576 if (sta) {
577 mesh_sta_info_init(sdata, sta, elems);
578 } else {
579 rcu_read_unlock();
580 /* can't run atomic */
581 sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status);
582 if (!sta) {
583 rcu_read_lock();
584 return NULL;
585 }
586
587 mesh_sta_info_init(sdata, sta, elems);
588
589 if (sta_info_insert_rcu(sta))
590 return NULL;
591 }
592
593 return sta;
594}
595
596/*
597 * mesh_neighbour_update - update or initialize new mesh neighbor.
598 *
599 * @sdata: local meshif
600 * @addr: peer's address
601 * @elems: IEs from beacon or mesh peering frame
602 * @rx_status: rx status for the frame for signal reporting
603 *
604 * Initiates peering if appropriate.
605 */
606void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
607 u8 *hw_addr,
608 struct ieee802_11_elems *elems,
609 struct ieee80211_rx_status *rx_status)
610{
611 struct sta_info *sta;
612 u32 changed = 0;
613
614 sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status);
615 if (!sta)
616 goto out;
617
618 sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form &
619 IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE;
620
621 if (mesh_peer_accepts_plinks(elems) &&
622 sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
623 sdata->u.mesh.accepting_plinks &&
624 sdata->u.mesh.mshcfg.auto_open_plinks &&
625 rssi_threshold_check(sdata, sta))
626 changed = mesh_plink_open(sta);
627
628 ieee80211_mps_frame_release(sta, elems);
629out:
630 rcu_read_unlock();
631 ieee80211_mbss_info_change_notify(sdata, changed);
632}
633
634void mesh_plink_timer(struct timer_list *t)
635{
636 struct mesh_sta *mesh = from_timer(mesh, t, plink_timer);
637 struct sta_info *sta;
638 u16 reason = 0;
639 struct ieee80211_sub_if_data *sdata;
640 struct mesh_config *mshcfg;
641 enum ieee80211_self_protected_actioncode action = 0;
642
643 /*
644 * This STA is valid because sta_info_destroy() will
645 * del_timer_sync() this timer after having made sure
646 * it cannot be readded (by deleting the plink.)
647 */
648 sta = mesh->plink_sta;
649
650 if (sta->sdata->local->quiescing)
651 return;
652
653 spin_lock_bh(&sta->mesh->plink_lock);
654
655 /* If a timer fires just before a state transition on another CPU,
656 * we may have already extended the timeout and changed state by the
657 * time we've acquired the lock and arrived here. In that case,
658 * skip this timer and wait for the new one.
659 */
660 if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
661 mpl_dbg(sta->sdata,
662 "Ignoring timer for %pM in state %s (timer adjusted)",
663 sta->sta.addr, mplstates[sta->mesh->plink_state]);
664 spin_unlock_bh(&sta->mesh->plink_lock);
665 return;
666 }
667
668 /* del_timer() and handler may race when entering these states */
669 if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
670 sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
671 mpl_dbg(sta->sdata,
672 "Ignoring timer for %pM in state %s (timer deleted)",
673 sta->sta.addr, mplstates[sta->mesh->plink_state]);
674 spin_unlock_bh(&sta->mesh->plink_lock);
675 return;
676 }
677
678 mpl_dbg(sta->sdata,
679 "Mesh plink timer for %pM fired on state %s\n",
680 sta->sta.addr, mplstates[sta->mesh->plink_state]);
681 sdata = sta->sdata;
682 mshcfg = &sdata->u.mesh.mshcfg;
683
684 switch (sta->mesh->plink_state) {
685 case NL80211_PLINK_OPN_RCVD:
686 case NL80211_PLINK_OPN_SNT:
687 /* retry timer */
688 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
689 u32 rand;
690 mpl_dbg(sta->sdata,
691 "Mesh plink for %pM (retry, timeout): %d %d\n",
692 sta->sta.addr, sta->mesh->plink_retries,
693 sta->mesh->plink_timeout);
694 get_random_bytes(&rand, sizeof(u32));
695 sta->mesh->plink_timeout = sta->mesh->plink_timeout +
696 rand % sta->mesh->plink_timeout;
697 ++sta->mesh->plink_retries;
698 mod_plink_timer(sta, sta->mesh->plink_timeout);
699 action = WLAN_SP_MESH_PEERING_OPEN;
700 break;
701 }
702 reason = WLAN_REASON_MESH_MAX_RETRIES;
703 fallthrough;
704 case NL80211_PLINK_CNF_RCVD:
705 /* confirm timer */
706 if (!reason)
707 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
708 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
709 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
710 action = WLAN_SP_MESH_PEERING_CLOSE;
711 break;
712 case NL80211_PLINK_HOLDING:
713 /* holding timer */
714 del_timer(&sta->mesh->plink_timer);
715 mesh_plink_fsm_restart(sta);
716 break;
717 default:
718 break;
719 }
720 spin_unlock_bh(&sta->mesh->plink_lock);
721 if (action)
722 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
723 sta->mesh->llid, sta->mesh->plid, reason);
724}
725
726static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
727{
728 sta->mesh->plink_timeout = timeout;
729 mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout));
730}
731
732static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
733 u16 llid)
734{
735 struct ieee80211_local *local = sdata->local;
736 bool in_use = false;
737 struct sta_info *sta;
738
739 rcu_read_lock();
740 list_for_each_entry_rcu(sta, &local->sta_list, list) {
741 if (sdata != sta->sdata)
742 continue;
743
744 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
745 in_use = true;
746 break;
747 }
748 }
749 rcu_read_unlock();
750
751 return in_use;
752}
753
754static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
755{
756 u16 llid;
757
758 do {
759 get_random_bytes(&llid, sizeof(llid));
760 } while (llid_in_use(sdata, llid));
761
762 return llid;
763}
764
765u32 mesh_plink_open(struct sta_info *sta)
766{
767 struct ieee80211_sub_if_data *sdata = sta->sdata;
768 u32 changed;
769
770 if (!test_sta_flag(sta, WLAN_STA_AUTH))
771 return 0;
772
773 spin_lock_bh(&sta->mesh->plink_lock);
774 sta->mesh->llid = mesh_get_new_llid(sdata);
775 if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
776 sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
777 spin_unlock_bh(&sta->mesh->plink_lock);
778 return 0;
779 }
780 sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
781 mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
782 spin_unlock_bh(&sta->mesh->plink_lock);
783 mpl_dbg(sdata,
784 "Mesh plink: starting establishment with %pM\n",
785 sta->sta.addr);
786
787 /* set the non-peer mode to active during peering */
788 changed = ieee80211_mps_local_status_update(sdata);
789
790 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
791 sta->sta.addr, sta->mesh->llid, 0, 0);
792 return changed;
793}
794
795u32 mesh_plink_block(struct sta_info *sta)
796{
797 u32 changed;
798
799 spin_lock_bh(&sta->mesh->plink_lock);
800 changed = __mesh_plink_deactivate(sta);
801 sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
802 spin_unlock_bh(&sta->mesh->plink_lock);
803 mesh_path_flush_by_nexthop(sta);
804
805 return changed;
806}
807
808static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
809 struct sta_info *sta,
810 enum plink_event event)
811{
812 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
813 u16 reason = (event == CLS_ACPT) ?
814 WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
815
816 sta->mesh->reason = reason;
817 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
818 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
819}
820
821static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
822 struct sta_info *sta)
823{
824 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
825 u32 changed = 0;
826
827 del_timer(&sta->mesh->plink_timer);
828 sta->mesh->plink_state = NL80211_PLINK_ESTAB;
829 changed |= mesh_plink_inc_estab_count(sdata);
830 changed |= mesh_set_ht_prot_mode(sdata);
831 changed |= mesh_set_short_slot_time(sdata);
832 mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
833 ieee80211_mps_sta_status_update(sta);
834 changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
835 return changed;
836}
837
838/**
839 * mesh_plink_fsm - step @sta MPM based on @event
840 *
841 * @sdata: interface
842 * @sta: mesh neighbor
843 * @event: peering event
844 *
845 * Return: changed MBSS flags
846 */
847static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
848 struct sta_info *sta, enum plink_event event)
849{
850 struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
851 enum ieee80211_self_protected_actioncode action = 0;
852 u32 changed = 0;
853 bool flush = false;
854
855 mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
856 mplstates[sta->mesh->plink_state], mplevents[event]);
857
858 spin_lock_bh(&sta->mesh->plink_lock);
859 switch (sta->mesh->plink_state) {
860 case NL80211_PLINK_LISTEN:
861 switch (event) {
862 case CLS_ACPT:
863 mesh_plink_fsm_restart(sta);
864 break;
865 case OPN_ACPT:
866 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
867 sta->mesh->llid = mesh_get_new_llid(sdata);
868 mesh_plink_timer_set(sta,
869 mshcfg->dot11MeshRetryTimeout);
870
871 /* set the non-peer mode to active during peering */
872 changed |= ieee80211_mps_local_status_update(sdata);
873 action = WLAN_SP_MESH_PEERING_OPEN;
874 break;
875 default:
876 break;
877 }
878 break;
879 case NL80211_PLINK_OPN_SNT:
880 switch (event) {
881 case OPN_RJCT:
882 case CNF_RJCT:
883 case CLS_ACPT:
884 mesh_plink_close(sdata, sta, event);
885 action = WLAN_SP_MESH_PEERING_CLOSE;
886 break;
887 case OPN_ACPT:
888 /* retry timer is left untouched */
889 sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
890 action = WLAN_SP_MESH_PEERING_CONFIRM;
891 break;
892 case CNF_ACPT:
893 sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
894 mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
895 break;
896 default:
897 break;
898 }
899 break;
900 case NL80211_PLINK_OPN_RCVD:
901 switch (event) {
902 case OPN_RJCT:
903 case CNF_RJCT:
904 case CLS_ACPT:
905 mesh_plink_close(sdata, sta, event);
906 action = WLAN_SP_MESH_PEERING_CLOSE;
907 break;
908 case OPN_ACPT:
909 action = WLAN_SP_MESH_PEERING_CONFIRM;
910 break;
911 case CNF_ACPT:
912 changed |= mesh_plink_establish(sdata, sta);
913 break;
914 default:
915 break;
916 }
917 break;
918 case NL80211_PLINK_CNF_RCVD:
919 switch (event) {
920 case OPN_RJCT:
921 case CNF_RJCT:
922 case CLS_ACPT:
923 mesh_plink_close(sdata, sta, event);
924 action = WLAN_SP_MESH_PEERING_CLOSE;
925 break;
926 case OPN_ACPT:
927 changed |= mesh_plink_establish(sdata, sta);
928 action = WLAN_SP_MESH_PEERING_CONFIRM;
929 break;
930 default:
931 break;
932 }
933 break;
934 case NL80211_PLINK_ESTAB:
935 switch (event) {
936 case CLS_ACPT:
937 changed |= __mesh_plink_deactivate(sta);
938 changed |= mesh_set_ht_prot_mode(sdata);
939 changed |= mesh_set_short_slot_time(sdata);
940 mesh_plink_close(sdata, sta, event);
941 action = WLAN_SP_MESH_PEERING_CLOSE;
942 flush = true;
943 break;
944 case OPN_ACPT:
945 action = WLAN_SP_MESH_PEERING_CONFIRM;
946 break;
947 default:
948 break;
949 }
950 break;
951 case NL80211_PLINK_HOLDING:
952 switch (event) {
953 case CLS_ACPT:
954 del_timer(&sta->mesh->plink_timer);
955 mesh_plink_fsm_restart(sta);
956 break;
957 case OPN_ACPT:
958 case CNF_ACPT:
959 case OPN_RJCT:
960 case CNF_RJCT:
961 action = WLAN_SP_MESH_PEERING_CLOSE;
962 break;
963 default:
964 break;
965 }
966 break;
967 default:
968 /* should not get here, PLINK_BLOCKED is dealt with at the
969 * beginning of the function
970 */
971 break;
972 }
973 spin_unlock_bh(&sta->mesh->plink_lock);
974 if (flush)
975 mesh_path_flush_by_nexthop(sta);
976 if (action) {
977 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
978 sta->mesh->llid, sta->mesh->plid,
979 sta->mesh->reason);
980
981 /* also send confirm in open case */
982 if (action == WLAN_SP_MESH_PEERING_OPEN) {
983 mesh_plink_frame_tx(sdata, sta,
984 WLAN_SP_MESH_PEERING_CONFIRM,
985 sta->sta.addr, sta->mesh->llid,
986 sta->mesh->plid, 0);
987 }
988 }
989
990 return changed;
991}
992
993/*
994 * mesh_plink_get_event - get correct MPM event
995 *
996 * @sdata: interface
997 * @sta: peer, leave NULL if processing a frame from a new suitable peer
998 * @elems: peering management IEs
999 * @ftype: frame type
1000 * @llid: peer's peer link ID
1001 * @plid: peer's local link ID
1002 *
1003 * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
1004 * an error.
1005 */
1006static enum plink_event
1007mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
1008 struct sta_info *sta,
1009 struct ieee802_11_elems *elems,
1010 enum ieee80211_self_protected_actioncode ftype,
1011 u16 llid, u16 plid)
1012{
1013 enum plink_event event = PLINK_UNDEFINED;
1014 u8 ie_len = elems->peering_len;
1015 bool matches_local;
1016
1017 matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
1018 mesh_matches_local(sdata, elems));
1019
1020 /* deny open request from non-matching peer */
1021 if (!matches_local && !sta) {
1022 event = OPN_RJCT;
1023 goto out;
1024 }
1025
1026 if (!sta) {
1027 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1028 mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1029 goto out;
1030 }
1031 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1032 if (!mesh_plink_free_count(sdata)) {
1033 mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1034 goto out;
1035 }
1036
1037 /* new matching peer */
1038 event = OPN_ACPT;
1039 goto out;
1040 } else {
1041 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1042 mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1043 goto out;
1044 }
1045 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1046 goto out;
1047 }
1048
1049 switch (ftype) {
1050 case WLAN_SP_MESH_PEERING_OPEN:
1051 if (!matches_local)
1052 event = OPN_RJCT;
1053 if (!mesh_plink_free_count(sdata) ||
1054 (sta->mesh->plid && sta->mesh->plid != plid))
1055 event = OPN_IGNR;
1056 else
1057 event = OPN_ACPT;
1058 break;
1059 case WLAN_SP_MESH_PEERING_CONFIRM:
1060 if (!matches_local)
1061 event = CNF_RJCT;
1062 if (!mesh_plink_free_count(sdata) ||
1063 sta->mesh->llid != llid ||
1064 (sta->mesh->plid && sta->mesh->plid != plid))
1065 event = CNF_IGNR;
1066 else
1067 event = CNF_ACPT;
1068 break;
1069 case WLAN_SP_MESH_PEERING_CLOSE:
1070 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1071 /* Do not check for llid or plid. This does not
1072 * follow the standard but since multiple plinks
1073 * per sta are not supported, it is necessary in
1074 * order to avoid a livelock when MP A sees an
1075 * establish peer link to MP B but MP B does not
1076 * see it. This can be caused by a timeout in
1077 * B's peer link establishment or B beign
1078 * restarted.
1079 */
1080 event = CLS_ACPT;
1081 else if (sta->mesh->plid != plid)
1082 event = CLS_IGNR;
1083 else if (ie_len == 8 && sta->mesh->llid != llid)
1084 event = CLS_IGNR;
1085 else
1086 event = CLS_ACPT;
1087 break;
1088 default:
1089 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1090 break;
1091 }
1092
1093out:
1094 return event;
1095}
1096
1097static void
1098mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1099 struct ieee80211_mgmt *mgmt,
1100 struct ieee802_11_elems *elems,
1101 struct ieee80211_rx_status *rx_status)
1102{
1103
1104 struct sta_info *sta;
1105 enum plink_event event;
1106 enum ieee80211_self_protected_actioncode ftype;
1107 u32 changed = 0;
1108 u8 ie_len = elems->peering_len;
1109 u16 plid, llid = 0;
1110
1111 if (!elems->peering) {
1112 mpl_dbg(sdata,
1113 "Mesh plink: missing necessary peer link ie\n");
1114 return;
1115 }
1116
1117 if (elems->rsn_len &&
1118 sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1119 mpl_dbg(sdata,
1120 "Mesh plink: can't establish link with secure peer\n");
1121 return;
1122 }
1123
1124 ftype = mgmt->u.action.u.self_prot.action_code;
1125 if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1126 (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1127 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1128 && ie_len != 8)) {
1129 mpl_dbg(sdata,
1130 "Mesh plink: incorrect plink ie length %d %d\n",
1131 ftype, ie_len);
1132 return;
1133 }
1134
1135 if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1136 (!elems->mesh_id || !elems->mesh_config)) {
1137 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1138 return;
1139 }
1140 /* Note the lines below are correct, the llid in the frame is the plid
1141 * from the point of view of this host.
1142 */
1143 plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1144 if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1145 (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1146 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1147
1148 /* WARNING: Only for sta pointer, is dropped & re-acquired */
1149 rcu_read_lock();
1150
1151 sta = sta_info_get(sdata, mgmt->sa);
1152
1153 if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1154 !rssi_threshold_check(sdata, sta)) {
1155 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1156 mgmt->sa);
1157 goto unlock_rcu;
1158 }
1159
1160 /* Now we will figure out the appropriate event... */
1161 event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1162
1163 if (event == OPN_ACPT) {
1164 rcu_read_unlock();
1165 /* allocate sta entry if necessary and update info */
1166 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
1167 if (!sta) {
1168 mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1169 goto unlock_rcu;
1170 }
1171 sta->mesh->plid = plid;
1172 } else if (!sta && event == OPN_RJCT) {
1173 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1174 mgmt->sa, 0, plid,
1175 WLAN_REASON_MESH_CONFIG);
1176 goto unlock_rcu;
1177 } else if (!sta || event == PLINK_UNDEFINED) {
1178 /* something went wrong */
1179 goto unlock_rcu;
1180 }
1181
1182 if (event == CNF_ACPT) {
1183 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1184 if (!sta->mesh->plid)
1185 sta->mesh->plid = plid;
1186
1187 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1188 }
1189
1190 changed |= mesh_plink_fsm(sdata, sta, event);
1191
1192unlock_rcu:
1193 rcu_read_unlock();
1194
1195 if (changed)
1196 ieee80211_mbss_info_change_notify(sdata, changed);
1197}
1198
1199void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1200 struct ieee80211_mgmt *mgmt, size_t len,
1201 struct ieee80211_rx_status *rx_status)
1202{
1203 struct ieee802_11_elems elems;
1204 size_t baselen;
1205 u8 *baseaddr;
1206
1207 /* need action_code, aux */
1208 if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1209 return;
1210
1211 if (sdata->u.mesh.user_mpm)
1212 /* userspace must register for these */
1213 return;
1214
1215 if (is_multicast_ether_addr(mgmt->da)) {
1216 mpl_dbg(sdata,
1217 "Mesh plink: ignore frame from multicast address\n");
1218 return;
1219 }
1220
1221 baseaddr = mgmt->u.action.u.self_prot.variable;
1222 baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1223 if (mgmt->u.action.u.self_prot.action_code ==
1224 WLAN_SP_MESH_PEERING_CONFIRM) {
1225 baseaddr += 4;
1226 baselen += 4;
1227
1228 if (baselen > len)
1229 return;
1230 }
1231 ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems,
1232 mgmt->bssid, NULL);
1233 mesh_process_plink_frame(sdata, mgmt, &elems, rx_status);
1234}