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Linux/net/mac80211/mesh_plink.c

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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 <linux/rculist.h>
 13 
 14 #include "ieee80211_i.h"
 15 #include "rate.h"
 16 #include "mesh.h"
 17 
 18 #define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)
 19 #define PLINK_GET_LLID(p) (p + 2)
 20 #define PLINK_GET_PLID(p) (p + 4)
 21 
 22 #define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
 23                                 jiffies + msecs_to_jiffies(t)))
 24 
 25 enum plink_event {
 26         PLINK_UNDEFINED,
 27         OPN_ACPT,
 28         OPN_RJCT,
 29         OPN_IGNR,
 30         CNF_ACPT,
 31         CNF_RJCT,
 32         CNF_IGNR,
 33         CLS_ACPT,
 34         CLS_IGNR
 35 };
 36 
 37 static const char * const mplstates[] = {
 38         [NL80211_PLINK_LISTEN] = "LISTEN",
 39         [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
 40         [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
 41         [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
 42         [NL80211_PLINK_ESTAB] = "ESTAB",
 43         [NL80211_PLINK_HOLDING] = "HOLDING",
 44         [NL80211_PLINK_BLOCKED] = "BLOCKED"
 45 };
 46 
 47 static const char * const mplevents[] = {
 48         [PLINK_UNDEFINED] = "NONE",
 49         [OPN_ACPT] = "OPN_ACPT",
 50         [OPN_RJCT] = "OPN_RJCT",
 51         [OPN_IGNR] = "OPN_IGNR",
 52         [CNF_ACPT] = "CNF_ACPT",
 53         [CNF_RJCT] = "CNF_RJCT",
 54         [CNF_IGNR] = "CNF_IGNR",
 55         [CLS_ACPT] = "CLS_ACPT",
 56         [CLS_IGNR] = "CLS_IGNR"
 57 };
 58 
 59 /* We only need a valid sta if user configured a minimum rssi_threshold. */
 60 static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
 61                                  struct sta_info *sta)
 62 {
 63         s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
 64         return rssi_threshold == 0 ||
 65                (sta &&
 66                 (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) >
 67                                                 rssi_threshold);
 68 }
 69 
 70 /**
 71  * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
 72  *
 73  * @sta: mesh peer link to restart
 74  *
 75  * Locking: this function must be called holding sta->mesh->plink_lock
 76  */
 77 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
 78 {
 79         lockdep_assert_held(&sta->mesh->plink_lock);
 80         sta->mesh->plink_state = NL80211_PLINK_LISTEN;
 81         sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0;
 82         sta->mesh->plink_retries = 0;
 83 }
 84 
 85 /*
 86  * mesh_set_short_slot_time - enable / disable ERP short slot time.
 87  *
 88  * The standard indirectly mandates mesh STAs to turn off short slot time by
 89  * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
 90  * can't be sneaky about it. Enable short slot time if all mesh STAs in the
 91  * MBSS support ERP rates.
 92  *
 93  * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
 94  */
 95 static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
 96 {
 97         struct ieee80211_local *local = sdata->local;
 98         struct ieee80211_supported_band *sband;
 99         struct sta_info *sta;
100         u32 erp_rates = 0, changed = 0;
101         int i;
102         bool short_slot = false;
103 
104         sband = ieee80211_get_sband(sdata);
105         if (!sband)
106                 return changed;
107 
108         if (sband->band == NL80211_BAND_5GHZ) {
109                 /* (IEEE 802.11-2012 19.4.5) */
110                 short_slot = true;
111                 goto out;
112         } else if (sband->band != NL80211_BAND_2GHZ) {
113                 goto out;
114         }
115 
116         for (i = 0; i < sband->n_bitrates; i++)
117                 if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
118                         erp_rates |= BIT(i);
119 
120         if (!erp_rates)
121                 goto out;
122 
123         rcu_read_lock();
124         list_for_each_entry_rcu(sta, &local->sta_list, list) {
125                 if (sdata != sta->sdata ||
126                     sta->mesh->plink_state != NL80211_PLINK_ESTAB)
127                         continue;
128 
129                 short_slot = false;
130                 if (erp_rates & sta->sta.supp_rates[sband->band])
131                         short_slot = true;
132                  else
133                         break;
134         }
135         rcu_read_unlock();
136 
137 out:
138         if (sdata->vif.bss_conf.use_short_slot != short_slot) {
139                 sdata->vif.bss_conf.use_short_slot = short_slot;
140                 changed = BSS_CHANGED_ERP_SLOT;
141                 mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
142                         sdata->vif.addr, short_slot);
143         }
144         return changed;
145 }
146 
147 /**
148  * mesh_set_ht_prot_mode - set correct HT protection mode
149  *
150  * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
151  * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
152  * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
153  * selected if any non-HT peers are present in our MBSS.  20MHz-protection mode
154  * is selected if all peers in our 20/40MHz MBSS support HT and atleast one
155  * HT20 peer is present. Otherwise no-protection mode is selected.
156  */
157 static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
158 {
159         struct ieee80211_local *local = sdata->local;
160         struct sta_info *sta;
161         u16 ht_opmode;
162         bool non_ht_sta = false, ht20_sta = false;
163 
164         switch (sdata->vif.bss_conf.chandef.width) {
165         case NL80211_CHAN_WIDTH_20_NOHT:
166         case NL80211_CHAN_WIDTH_5:
167         case NL80211_CHAN_WIDTH_10:
168                 return 0;
169         default:
170                 break;
171         }
172 
173         rcu_read_lock();
174         list_for_each_entry_rcu(sta, &local->sta_list, list) {
175                 if (sdata != sta->sdata ||
176                     sta->mesh->plink_state != NL80211_PLINK_ESTAB)
177                         continue;
178 
179                 if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
180                         continue;
181 
182                 if (!sta->sta.ht_cap.ht_supported) {
183                         mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
184                                        sta->sta.addr);
185                         non_ht_sta = true;
186                         break;
187                 }
188 
189                 mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
190                 ht20_sta = true;
191         }
192         rcu_read_unlock();
193 
194         if (non_ht_sta)
195                 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
196         else if (ht20_sta &&
197                  sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
198                 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
199         else
200                 ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
201 
202         if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
203                 return 0;
204 
205         sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
206         sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
207         mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
208         return BSS_CHANGED_HT;
209 }
210 
211 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
212                                struct sta_info *sta,
213                                enum ieee80211_self_protected_actioncode action,
214                                u8 *da, u16 llid, u16 plid, u16 reason)
215 {
216         struct ieee80211_local *local = sdata->local;
217         struct sk_buff *skb;
218         struct ieee80211_tx_info *info;
219         struct ieee80211_mgmt *mgmt;
220         bool include_plid = false;
221         u16 peering_proto = 0;
222         u8 *pos, ie_len = 4;
223         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
224                       sizeof(mgmt->u.action.u.self_prot);
225         int err = -ENOMEM;
226 
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                             2 + 8 + /* peering IE */
240                             sdata->u.mesh.ie_len);
241         if (!skb)
242                 return err;
243         info = IEEE80211_SKB_CB(skb);
244         skb_reserve(skb, local->tx_headroom);
245         mgmt = skb_put_zero(skb, hdr_len);
246         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
247                                           IEEE80211_STYPE_ACTION);
248         memcpy(mgmt->da, da, ETH_ALEN);
249         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
250         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
251         mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
252         mgmt->u.action.u.self_prot.action_code = action;
253 
254         if (action != WLAN_SP_MESH_PEERING_CLOSE) {
255                 struct ieee80211_supported_band *sband;
256                 enum nl80211_band band;
257 
258                 sband = ieee80211_get_sband(sdata);
259                 if (!sband) {
260                         err = -EINVAL;
261                         goto free;
262                 }
263                 band = sband->band;
264 
265                 /* capability info */
266                 pos = skb_put_zero(skb, 2);
267                 if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
268                         /* AID */
269                         pos = skb_put(skb, 2);
270                         put_unaligned_le16(sta->sta.aid, pos);
271                 }
272                 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
273                     ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
274                     mesh_add_rsn_ie(sdata, skb) ||
275                     mesh_add_meshid_ie(sdata, skb) ||
276                     mesh_add_meshconf_ie(sdata, skb))
277                         goto free;
278         } else {        /* WLAN_SP_MESH_PEERING_CLOSE */
279                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
280                 if (mesh_add_meshid_ie(sdata, skb))
281                         goto free;
282         }
283 
284         /* Add Mesh Peering Management element */
285         switch (action) {
286         case WLAN_SP_MESH_PEERING_OPEN:
287                 break;
288         case WLAN_SP_MESH_PEERING_CONFIRM:
289                 ie_len += 2;
290                 include_plid = true;
291                 break;
292         case WLAN_SP_MESH_PEERING_CLOSE:
293                 if (plid) {
294                         ie_len += 2;
295                         include_plid = true;
296                 }
297                 ie_len += 2;    /* reason code */
298                 break;
299         default:
300                 err = -EINVAL;
301                 goto free;
302         }
303 
304         if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
305                 goto free;
306 
307         pos = skb_put(skb, 2 + ie_len);
308         *pos++ = WLAN_EID_PEER_MGMT;
309         *pos++ = ie_len;
310         memcpy(pos, &peering_proto, 2);
311         pos += 2;
312         put_unaligned_le16(llid, pos);
313         pos += 2;
314         if (include_plid) {
315                 put_unaligned_le16(plid, pos);
316                 pos += 2;
317         }
318         if (action == WLAN_SP_MESH_PEERING_CLOSE) {
319                 put_unaligned_le16(reason, pos);
320                 pos += 2;
321         }
322 
323         if (action != WLAN_SP_MESH_PEERING_CLOSE) {
324                 if (mesh_add_ht_cap_ie(sdata, skb) ||
325                     mesh_add_ht_oper_ie(sdata, skb) ||
326                     mesh_add_vht_cap_ie(sdata, skb) ||
327                     mesh_add_vht_oper_ie(sdata, skb))
328                         goto free;
329         }
330 
331         if (mesh_add_vendor_ies(sdata, skb))
332                 goto free;
333 
334         ieee80211_tx_skb(sdata, skb);
335         return 0;
336 free:
337         kfree_skb(skb);
338         return err;
339 }
340 
341 /**
342  * __mesh_plink_deactivate - deactivate mesh peer link
343  *
344  * @sta: mesh peer link to deactivate
345  *
346  * Mesh paths with this peer as next hop should be flushed
347  * by the caller outside of plink_lock.
348  *
349  * Returns beacon changed flag if the beacon content changed.
350  *
351  * Locking: the caller must hold sta->mesh->plink_lock
352  */
353 static u32 __mesh_plink_deactivate(struct sta_info *sta)
354 {
355         struct ieee80211_sub_if_data *sdata = sta->sdata;
356         u32 changed = 0;
357 
358         lockdep_assert_held(&sta->mesh->plink_lock);
359 
360         if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
361                 changed = mesh_plink_dec_estab_count(sdata);
362         sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
363 
364         ieee80211_mps_sta_status_update(sta);
365         changed |= ieee80211_mps_set_sta_local_pm(sta,
366                         NL80211_MESH_POWER_UNKNOWN);
367 
368         return changed;
369 }
370 
371 /**
372  * mesh_plink_deactivate - deactivate mesh peer link
373  *
374  * @sta: mesh peer link to deactivate
375  *
376  * All mesh paths with this peer as next hop will be flushed
377  */
378 u32 mesh_plink_deactivate(struct sta_info *sta)
379 {
380         struct ieee80211_sub_if_data *sdata = sta->sdata;
381         u32 changed;
382 
383         spin_lock_bh(&sta->mesh->plink_lock);
384         changed = __mesh_plink_deactivate(sta);
385 
386         if (!sdata->u.mesh.user_mpm) {
387                 sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED;
388                 mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE,
389                                     sta->sta.addr, sta->mesh->llid,
390                                     sta->mesh->plid, sta->mesh->reason);
391         }
392         spin_unlock_bh(&sta->mesh->plink_lock);
393         if (!sdata->u.mesh.user_mpm)
394                 del_timer_sync(&sta->mesh->plink_timer);
395         mesh_path_flush_by_nexthop(sta);
396 
397         /* make sure no readers can access nexthop sta from here on */
398         synchronize_net();
399 
400         return changed;
401 }
402 
403 static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
404                                struct sta_info *sta,
405                                struct ieee802_11_elems *elems, bool insert)
406 {
407         struct ieee80211_local *local = sdata->local;
408         struct ieee80211_supported_band *sband;
409         u32 rates, basic_rates = 0, changed = 0;
410         enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
411 
412         sband = ieee80211_get_sband(sdata);
413         if (!sband)
414                 return;
415 
416         rates = ieee80211_sta_get_rates(sdata, elems, sband->band,
417                                         &basic_rates);
418 
419         spin_lock_bh(&sta->mesh->plink_lock);
420         sta->rx_stats.last_rx = jiffies;
421 
422         /* rates and capabilities don't change during peering */
423         if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
424             sta->mesh->processed_beacon)
425                 goto out;
426         sta->mesh->processed_beacon = true;
427 
428         if (sta->sta.supp_rates[sband->band] != rates)
429                 changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
430         sta->sta.supp_rates[sband->band] = rates;
431 
432         if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
433                                               elems->ht_cap_elem, sta))
434                 changed |= IEEE80211_RC_BW_CHANGED;
435 
436         ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
437                                             elems->vht_cap_elem, sta);
438 
439         if (bw != sta->sta.bandwidth)
440                 changed |= IEEE80211_RC_BW_CHANGED;
441 
442         /* HT peer is operating 20MHz-only */
443         if (elems->ht_operation &&
444             !(elems->ht_operation->ht_param &
445               IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
446                 if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
447                         changed |= IEEE80211_RC_BW_CHANGED;
448                 sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
449         }
450 
451         if (insert)
452                 rate_control_rate_init(sta);
453         else
454                 rate_control_rate_update(local, sband, sta, changed);
455 out:
456         spin_unlock_bh(&sta->mesh->plink_lock);
457 }
458 
459 static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
460 {
461         struct sta_info *sta;
462         unsigned long *aid_map;
463         int aid;
464 
465         aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
466                           sizeof(*aid_map), GFP_KERNEL);
467         if (!aid_map)
468                 return -ENOMEM;
469 
470         /* reserve aid 0 for mcast indication */
471         __set_bit(0, aid_map);
472 
473         rcu_read_lock();
474         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list)
475                 __set_bit(sta->sta.aid, aid_map);
476         rcu_read_unlock();
477 
478         aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
479         kfree(aid_map);
480 
481         if (aid > IEEE80211_MAX_AID)
482                 return -ENOBUFS;
483 
484         return aid;
485 }
486 
487 static struct sta_info *
488 __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
489 {
490         struct sta_info *sta;
491         int aid;
492 
493         if (sdata->local->num_sta >= MESH_MAX_PLINKS)
494                 return NULL;
495 
496         aid = mesh_allocate_aid(sdata);
497         if (aid < 0)
498                 return NULL;
499 
500         sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
501         if (!sta)
502                 return NULL;
503 
504         sta->mesh->plink_state = NL80211_PLINK_LISTEN;
505         sta->sta.wme = true;
506         sta->sta.aid = aid;
507 
508         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
509         sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
510         sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
511 
512         return sta;
513 }
514 
515 static struct sta_info *
516 mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
517                     struct ieee802_11_elems *elems)
518 {
519         struct sta_info *sta = NULL;
520 
521         /* Userspace handles station allocation */
522         if (sdata->u.mesh.user_mpm ||
523             sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
524                 if (mesh_peer_accepts_plinks(elems) &&
525                     mesh_plink_availables(sdata))
526                         cfg80211_notify_new_peer_candidate(sdata->dev, addr,
527                                                            elems->ie_start,
528                                                            elems->total_len,
529                                                            GFP_KERNEL);
530         } else
531                 sta = __mesh_sta_info_alloc(sdata, addr);
532 
533         return sta;
534 }
535 
536 /*
537  * mesh_sta_info_get - return mesh sta info entry for @addr.
538  *
539  * @sdata: local meshif
540  * @addr: peer's address
541  * @elems: IEs from beacon or mesh peering frame.
542  *
543  * Return existing or newly allocated sta_info under RCU read lock.
544  * (re)initialize with given IEs.
545  */
546 static struct sta_info *
547 mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
548                   u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
549 {
550         struct sta_info *sta = NULL;
551 
552         rcu_read_lock();
553         sta = sta_info_get(sdata, addr);
554         if (sta) {
555                 mesh_sta_info_init(sdata, sta, elems, false);
556         } else {
557                 rcu_read_unlock();
558                 /* can't run atomic */
559                 sta = mesh_sta_info_alloc(sdata, addr, elems);
560                 if (!sta) {
561                         rcu_read_lock();
562                         return NULL;
563                 }
564 
565                 mesh_sta_info_init(sdata, sta, elems, true);
566 
567                 if (sta_info_insert_rcu(sta))
568                         return NULL;
569         }
570 
571         return sta;
572 }
573 
574 /*
575  * mesh_neighbour_update - update or initialize new mesh neighbor.
576  *
577  * @sdata: local meshif
578  * @addr: peer's address
579  * @elems: IEs from beacon or mesh peering frame
580  *
581  * Initiates peering if appropriate.
582  */
583 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
584                            u8 *hw_addr,
585                            struct ieee802_11_elems *elems)
586 {
587         struct sta_info *sta;
588         u32 changed = 0;
589 
590         sta = mesh_sta_info_get(sdata, hw_addr, elems);
591         if (!sta)
592                 goto out;
593 
594         if (mesh_peer_accepts_plinks(elems) &&
595             sta->mesh->plink_state == NL80211_PLINK_LISTEN &&
596             sdata->u.mesh.accepting_plinks &&
597             sdata->u.mesh.mshcfg.auto_open_plinks &&
598             rssi_threshold_check(sdata, sta))
599                 changed = mesh_plink_open(sta);
600 
601         ieee80211_mps_frame_release(sta, elems);
602 out:
603         rcu_read_unlock();
604         ieee80211_mbss_info_change_notify(sdata, changed);
605 }
606 
607 static void mesh_plink_timer(unsigned long data)
608 {
609         struct sta_info *sta;
610         u16 reason = 0;
611         struct ieee80211_sub_if_data *sdata;
612         struct mesh_config *mshcfg;
613         enum ieee80211_self_protected_actioncode action = 0;
614 
615         /*
616          * This STA is valid because sta_info_destroy() will
617          * del_timer_sync() this timer after having made sure
618          * it cannot be readded (by deleting the plink.)
619          */
620         sta = (struct sta_info *) data;
621 
622         if (sta->sdata->local->quiescing)
623                 return;
624 
625         spin_lock_bh(&sta->mesh->plink_lock);
626 
627         /* If a timer fires just before a state transition on another CPU,
628          * we may have already extended the timeout and changed state by the
629          * time we've acquired the lock and arrived  here.  In that case,
630          * skip this timer and wait for the new one.
631          */
632         if (time_before(jiffies, sta->mesh->plink_timer.expires)) {
633                 mpl_dbg(sta->sdata,
634                         "Ignoring timer for %pM in state %s (timer adjusted)",
635                         sta->sta.addr, mplstates[sta->mesh->plink_state]);
636                 spin_unlock_bh(&sta->mesh->plink_lock);
637                 return;
638         }
639 
640         /* del_timer() and handler may race when entering these states */
641         if (sta->mesh->plink_state == NL80211_PLINK_LISTEN ||
642             sta->mesh->plink_state == NL80211_PLINK_ESTAB) {
643                 mpl_dbg(sta->sdata,
644                         "Ignoring timer for %pM in state %s (timer deleted)",
645                         sta->sta.addr, mplstates[sta->mesh->plink_state]);
646                 spin_unlock_bh(&sta->mesh->plink_lock);
647                 return;
648         }
649 
650         mpl_dbg(sta->sdata,
651                 "Mesh plink timer for %pM fired on state %s\n",
652                 sta->sta.addr, mplstates[sta->mesh->plink_state]);
653         sdata = sta->sdata;
654         mshcfg = &sdata->u.mesh.mshcfg;
655 
656         switch (sta->mesh->plink_state) {
657         case NL80211_PLINK_OPN_RCVD:
658         case NL80211_PLINK_OPN_SNT:
659                 /* retry timer */
660                 if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) {
661                         u32 rand;
662                         mpl_dbg(sta->sdata,
663                                 "Mesh plink for %pM (retry, timeout): %d %d\n",
664                                 sta->sta.addr, sta->mesh->plink_retries,
665                                 sta->mesh->plink_timeout);
666                         get_random_bytes(&rand, sizeof(u32));
667                         sta->mesh->plink_timeout = sta->mesh->plink_timeout +
668                                              rand % sta->mesh->plink_timeout;
669                         ++sta->mesh->plink_retries;
670                         mod_plink_timer(sta, sta->mesh->plink_timeout);
671                         action = WLAN_SP_MESH_PEERING_OPEN;
672                         break;
673                 }
674                 reason = WLAN_REASON_MESH_MAX_RETRIES;
675                 /* fall through on else */
676         case NL80211_PLINK_CNF_RCVD:
677                 /* confirm timer */
678                 if (!reason)
679                         reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
680                 sta->mesh->plink_state = NL80211_PLINK_HOLDING;
681                 mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
682                 action = WLAN_SP_MESH_PEERING_CLOSE;
683                 break;
684         case NL80211_PLINK_HOLDING:
685                 /* holding timer */
686                 del_timer(&sta->mesh->plink_timer);
687                 mesh_plink_fsm_restart(sta);
688                 break;
689         default:
690                 break;
691         }
692         spin_unlock_bh(&sta->mesh->plink_lock);
693         if (action)
694                 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
695                                     sta->mesh->llid, sta->mesh->plid, reason);
696 }
697 
698 static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout)
699 {
700         sta->mesh->plink_timer.expires = jiffies + msecs_to_jiffies(timeout);
701         sta->mesh->plink_timer.data = (unsigned long) sta;
702         sta->mesh->plink_timer.function = mesh_plink_timer;
703         sta->mesh->plink_timeout = timeout;
704         add_timer(&sta->mesh->plink_timer);
705 }
706 
707 static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
708                         u16 llid)
709 {
710         struct ieee80211_local *local = sdata->local;
711         bool in_use = false;
712         struct sta_info *sta;
713 
714         rcu_read_lock();
715         list_for_each_entry_rcu(sta, &local->sta_list, list) {
716                 if (sdata != sta->sdata)
717                         continue;
718 
719                 if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) {
720                         in_use = true;
721                         break;
722                 }
723         }
724         rcu_read_unlock();
725 
726         return in_use;
727 }
728 
729 static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
730 {
731         u16 llid;
732 
733         do {
734                 get_random_bytes(&llid, sizeof(llid));
735         } while (llid_in_use(sdata, llid));
736 
737         return llid;
738 }
739 
740 u32 mesh_plink_open(struct sta_info *sta)
741 {
742         struct ieee80211_sub_if_data *sdata = sta->sdata;
743         u32 changed;
744 
745         if (!test_sta_flag(sta, WLAN_STA_AUTH))
746                 return 0;
747 
748         spin_lock_bh(&sta->mesh->plink_lock);
749         sta->mesh->llid = mesh_get_new_llid(sdata);
750         if (sta->mesh->plink_state != NL80211_PLINK_LISTEN &&
751             sta->mesh->plink_state != NL80211_PLINK_BLOCKED) {
752                 spin_unlock_bh(&sta->mesh->plink_lock);
753                 return 0;
754         }
755         sta->mesh->plink_state = NL80211_PLINK_OPN_SNT;
756         mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
757         spin_unlock_bh(&sta->mesh->plink_lock);
758         mpl_dbg(sdata,
759                 "Mesh plink: starting establishment with %pM\n",
760                 sta->sta.addr);
761 
762         /* set the non-peer mode to active during peering */
763         changed = ieee80211_mps_local_status_update(sdata);
764 
765         mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN,
766                             sta->sta.addr, sta->mesh->llid, 0, 0);
767         return changed;
768 }
769 
770 u32 mesh_plink_block(struct sta_info *sta)
771 {
772         u32 changed;
773 
774         spin_lock_bh(&sta->mesh->plink_lock);
775         changed = __mesh_plink_deactivate(sta);
776         sta->mesh->plink_state = NL80211_PLINK_BLOCKED;
777         spin_unlock_bh(&sta->mesh->plink_lock);
778         mesh_path_flush_by_nexthop(sta);
779 
780         return changed;
781 }
782 
783 static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
784                              struct sta_info *sta,
785                              enum plink_event event)
786 {
787         struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
788         u16 reason = (event == CLS_ACPT) ?
789                      WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
790 
791         sta->mesh->reason = reason;
792         sta->mesh->plink_state = NL80211_PLINK_HOLDING;
793         mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
794 }
795 
796 static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
797                                 struct sta_info *sta)
798 {
799         struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
800         u32 changed = 0;
801 
802         del_timer(&sta->mesh->plink_timer);
803         sta->mesh->plink_state = NL80211_PLINK_ESTAB;
804         changed |= mesh_plink_inc_estab_count(sdata);
805         changed |= mesh_set_ht_prot_mode(sdata);
806         changed |= mesh_set_short_slot_time(sdata);
807         mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
808         ieee80211_mps_sta_status_update(sta);
809         changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
810         return changed;
811 }
812 
813 /**
814  * mesh_plink_fsm - step @sta MPM based on @event
815  *
816  * @sdata: interface
817  * @sta: mesh neighbor
818  * @event: peering event
819  *
820  * Return: changed MBSS flags
821  */
822 static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
823                           struct sta_info *sta, enum plink_event event)
824 {
825         struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
826         enum ieee80211_self_protected_actioncode action = 0;
827         u32 changed = 0;
828         bool flush = false;
829 
830         mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
831                 mplstates[sta->mesh->plink_state], mplevents[event]);
832 
833         spin_lock_bh(&sta->mesh->plink_lock);
834         switch (sta->mesh->plink_state) {
835         case NL80211_PLINK_LISTEN:
836                 switch (event) {
837                 case CLS_ACPT:
838                         mesh_plink_fsm_restart(sta);
839                         break;
840                 case OPN_ACPT:
841                         sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
842                         sta->mesh->llid = mesh_get_new_llid(sdata);
843                         mesh_plink_timer_set(sta,
844                                              mshcfg->dot11MeshRetryTimeout);
845 
846                         /* set the non-peer mode to active during peering */
847                         changed |= ieee80211_mps_local_status_update(sdata);
848                         action = WLAN_SP_MESH_PEERING_OPEN;
849                         break;
850                 default:
851                         break;
852                 }
853                 break;
854         case NL80211_PLINK_OPN_SNT:
855                 switch (event) {
856                 case OPN_RJCT:
857                 case CNF_RJCT:
858                 case CLS_ACPT:
859                         mesh_plink_close(sdata, sta, event);
860                         action = WLAN_SP_MESH_PEERING_CLOSE;
861                         break;
862                 case OPN_ACPT:
863                         /* retry timer is left untouched */
864                         sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD;
865                         action = WLAN_SP_MESH_PEERING_CONFIRM;
866                         break;
867                 case CNF_ACPT:
868                         sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD;
869                         mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout);
870                         break;
871                 default:
872                         break;
873                 }
874                 break;
875         case NL80211_PLINK_OPN_RCVD:
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                         action = WLAN_SP_MESH_PEERING_CONFIRM;
885                         break;
886                 case CNF_ACPT:
887                         changed |= mesh_plink_establish(sdata, sta);
888                         break;
889                 default:
890                         break;
891                 }
892                 break;
893         case NL80211_PLINK_CNF_RCVD:
894                 switch (event) {
895                 case OPN_RJCT:
896                 case CNF_RJCT:
897                 case CLS_ACPT:
898                         mesh_plink_close(sdata, sta, event);
899                         action = WLAN_SP_MESH_PEERING_CLOSE;
900                         break;
901                 case OPN_ACPT:
902                         changed |= mesh_plink_establish(sdata, sta);
903                         action = WLAN_SP_MESH_PEERING_CONFIRM;
904                         break;
905                 default:
906                         break;
907                 }
908                 break;
909         case NL80211_PLINK_ESTAB:
910                 switch (event) {
911                 case CLS_ACPT:
912                         changed |= __mesh_plink_deactivate(sta);
913                         changed |= mesh_set_ht_prot_mode(sdata);
914                         changed |= mesh_set_short_slot_time(sdata);
915                         mesh_plink_close(sdata, sta, event);
916                         action = WLAN_SP_MESH_PEERING_CLOSE;
917                         flush = true;
918                         break;
919                 case OPN_ACPT:
920                         action = WLAN_SP_MESH_PEERING_CONFIRM;
921                         break;
922                 default:
923                         break;
924                 }
925                 break;
926         case NL80211_PLINK_HOLDING:
927                 switch (event) {
928                 case CLS_ACPT:
929                         del_timer(&sta->mesh->plink_timer);
930                         mesh_plink_fsm_restart(sta);
931                         break;
932                 case OPN_ACPT:
933                 case CNF_ACPT:
934                 case OPN_RJCT:
935                 case CNF_RJCT:
936                         action = WLAN_SP_MESH_PEERING_CLOSE;
937                         break;
938                 default:
939                         break;
940                 }
941                 break;
942         default:
943                 /* should not get here, PLINK_BLOCKED is dealt with at the
944                  * beginning of the function
945                  */
946                 break;
947         }
948         spin_unlock_bh(&sta->mesh->plink_lock);
949         if (flush)
950                 mesh_path_flush_by_nexthop(sta);
951         if (action) {
952                 mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr,
953                                     sta->mesh->llid, sta->mesh->plid,
954                                     sta->mesh->reason);
955 
956                 /* also send confirm in open case */
957                 if (action == WLAN_SP_MESH_PEERING_OPEN) {
958                         mesh_plink_frame_tx(sdata, sta,
959                                             WLAN_SP_MESH_PEERING_CONFIRM,
960                                             sta->sta.addr, sta->mesh->llid,
961                                             sta->mesh->plid, 0);
962                 }
963         }
964 
965         return changed;
966 }
967 
968 /*
969  * mesh_plink_get_event - get correct MPM event
970  *
971  * @sdata: interface
972  * @sta: peer, leave NULL if processing a frame from a new suitable peer
973  * @elems: peering management IEs
974  * @ftype: frame type
975  * @llid: peer's peer link ID
976  * @plid: peer's local link ID
977  *
978  * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
979  * an error.
980  */
981 static enum plink_event
982 mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
983                      struct sta_info *sta,
984                      struct ieee802_11_elems *elems,
985                      enum ieee80211_self_protected_actioncode ftype,
986                      u16 llid, u16 plid)
987 {
988         enum plink_event event = PLINK_UNDEFINED;
989         u8 ie_len = elems->peering_len;
990         bool matches_local;
991 
992         matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
993                          mesh_matches_local(sdata, elems));
994 
995         /* deny open request from non-matching peer */
996         if (!matches_local && !sta) {
997                 event = OPN_RJCT;
998                 goto out;
999         }
1000 
1001         if (!sta) {
1002                 if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
1003                         mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
1004                         goto out;
1005                 }
1006                 /* ftype == WLAN_SP_MESH_PEERING_OPEN */
1007                 if (!mesh_plink_free_count(sdata)) {
1008                         mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
1009                         goto out;
1010                 }
1011 
1012                 /* new matching peer */
1013                 event = OPN_ACPT;
1014                 goto out;
1015         } else {
1016                 if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
1017                         mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
1018                         goto out;
1019                 }
1020                 if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED)
1021                         goto out;
1022         }
1023 
1024         switch (ftype) {
1025         case WLAN_SP_MESH_PEERING_OPEN:
1026                 if (!matches_local)
1027                         event = OPN_RJCT;
1028                 if (!mesh_plink_free_count(sdata) ||
1029                     (sta->mesh->plid && sta->mesh->plid != plid))
1030                         event = OPN_IGNR;
1031                 else
1032                         event = OPN_ACPT;
1033                 break;
1034         case WLAN_SP_MESH_PEERING_CONFIRM:
1035                 if (!matches_local)
1036                         event = CNF_RJCT;
1037                 if (!mesh_plink_free_count(sdata) ||
1038                     sta->mesh->llid != llid ||
1039                     (sta->mesh->plid && sta->mesh->plid != plid))
1040                         event = CNF_IGNR;
1041                 else
1042                         event = CNF_ACPT;
1043                 break;
1044         case WLAN_SP_MESH_PEERING_CLOSE:
1045                 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
1046                         /* Do not check for llid or plid. This does not
1047                          * follow the standard but since multiple plinks
1048                          * per sta are not supported, it is necessary in
1049                          * order to avoid a livelock when MP A sees an
1050                          * establish peer link to MP B but MP B does not
1051                          * see it. This can be caused by a timeout in
1052                          * B's peer link establishment or B beign
1053                          * restarted.
1054                          */
1055                         event = CLS_ACPT;
1056                 else if (sta->mesh->plid != plid)
1057                         event = CLS_IGNR;
1058                 else if (ie_len == 8 && sta->mesh->llid != llid)
1059                         event = CLS_IGNR;
1060                 else
1061                         event = CLS_ACPT;
1062                 break;
1063         default:
1064                 mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
1065                 break;
1066         }
1067 
1068 out:
1069         return event;
1070 }
1071 
1072 static void
1073 mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
1074                          struct ieee80211_mgmt *mgmt,
1075                          struct ieee802_11_elems *elems)
1076 {
1077 
1078         struct sta_info *sta;
1079         enum plink_event event;
1080         enum ieee80211_self_protected_actioncode ftype;
1081         u32 changed = 0;
1082         u8 ie_len = elems->peering_len;
1083         u16 plid, llid = 0;
1084 
1085         if (!elems->peering) {
1086                 mpl_dbg(sdata,
1087                         "Mesh plink: missing necessary peer link ie\n");
1088                 return;
1089         }
1090 
1091         if (elems->rsn_len &&
1092             sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
1093                 mpl_dbg(sdata,
1094                         "Mesh plink: can't establish link with secure peer\n");
1095                 return;
1096         }
1097 
1098         ftype = mgmt->u.action.u.self_prot.action_code;
1099         if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
1100             (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
1101             (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
1102                                                         && ie_len != 8)) {
1103                 mpl_dbg(sdata,
1104                         "Mesh plink: incorrect plink ie length %d %d\n",
1105                         ftype, ie_len);
1106                 return;
1107         }
1108 
1109         if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
1110             (!elems->mesh_id || !elems->mesh_config)) {
1111                 mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
1112                 return;
1113         }
1114         /* Note the lines below are correct, the llid in the frame is the plid
1115          * from the point of view of this host.
1116          */
1117         plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering));
1118         if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
1119             (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
1120                 llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering));
1121 
1122         /* WARNING: Only for sta pointer, is dropped & re-acquired */
1123         rcu_read_lock();
1124 
1125         sta = sta_info_get(sdata, mgmt->sa);
1126 
1127         if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
1128             !rssi_threshold_check(sdata, sta)) {
1129                 mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
1130                         mgmt->sa);
1131                 goto unlock_rcu;
1132         }
1133 
1134         /* Now we will figure out the appropriate event... */
1135         event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
1136 
1137         if (event == OPN_ACPT) {
1138                 rcu_read_unlock();
1139                 /* allocate sta entry if necessary and update info */
1140                 sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
1141                 if (!sta) {
1142                         mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
1143                         goto unlock_rcu;
1144                 }
1145                 sta->mesh->plid = plid;
1146         } else if (!sta && event == OPN_RJCT) {
1147                 mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE,
1148                                     mgmt->sa, 0, plid,
1149                                     WLAN_REASON_MESH_CONFIG);
1150                 goto unlock_rcu;
1151         } else if (!sta || event == PLINK_UNDEFINED) {
1152                 /* something went wrong */
1153                 goto unlock_rcu;
1154         }
1155 
1156         if (event == CNF_ACPT) {
1157                 /* 802.11-2012 13.3.7.2 - update plid on CNF if not set */
1158                 if (!sta->mesh->plid)
1159                         sta->mesh->plid = plid;
1160 
1161                 sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt));
1162         }
1163 
1164         changed |= mesh_plink_fsm(sdata, sta, event);
1165 
1166 unlock_rcu:
1167         rcu_read_unlock();
1168 
1169         if (changed)
1170                 ieee80211_mbss_info_change_notify(sdata, changed);
1171 }
1172 
1173 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
1174                          struct ieee80211_mgmt *mgmt, size_t len,
1175                          struct ieee80211_rx_status *rx_status)
1176 {
1177         struct ieee802_11_elems elems;
1178         size_t baselen;
1179         u8 *baseaddr;
1180 
1181         /* need action_code, aux */
1182         if (len < IEEE80211_MIN_ACTION_SIZE + 3)
1183                 return;
1184 
1185         if (sdata->u.mesh.user_mpm)
1186                 /* userspace must register for these */
1187                 return;
1188 
1189         if (is_multicast_ether_addr(mgmt->da)) {
1190                 mpl_dbg(sdata,
1191                         "Mesh plink: ignore frame from multicast address\n");
1192                 return;
1193         }
1194 
1195         baseaddr = mgmt->u.action.u.self_prot.variable;
1196         baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
1197         if (mgmt->u.action.u.self_prot.action_code ==
1198                                                 WLAN_SP_MESH_PEERING_CONFIRM) {
1199                 baseaddr += 4;
1200                 baselen += 4;
1201 
1202                 if (baselen > len)
1203                         return;
1204         }
1205         ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
1206         mesh_process_plink_frame(sdata, mgmt, &elems);
1207 }
1208 

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