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TOMOYO Linux Cross Reference
Linux/net/mac80211/mesh.c

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  1 /*
  2  * Copyright (c) 2008, 2009 open80211s Ltd.
  3  * Copyright (C) 2018 - 2019 Intel Corporation
  4  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
  5  *             Javier Cardona <javier@cozybit.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  */
 11 
 12 #include <linux/slab.h>
 13 #include <asm/unaligned.h>
 14 #include "ieee80211_i.h"
 15 #include "mesh.h"
 16 #include "driver-ops.h"
 17 
 18 static int mesh_allocated;
 19 static struct kmem_cache *rm_cache;
 20 
 21 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
 22 {
 23         return (mgmt->u.action.u.mesh_action.action_code ==
 24                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
 25 }
 26 
 27 void ieee80211s_init(void)
 28 {
 29         mesh_allocated = 1;
 30         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
 31                                      0, 0, NULL);
 32 }
 33 
 34 void ieee80211s_stop(void)
 35 {
 36         if (!mesh_allocated)
 37                 return;
 38         kmem_cache_destroy(rm_cache);
 39 }
 40 
 41 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t)
 42 {
 43         struct ieee80211_sub_if_data *sdata =
 44                 from_timer(sdata, t, u.mesh.housekeeping_timer);
 45         struct ieee80211_local *local = sdata->local;
 46         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 47 
 48         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 49 
 50         ieee80211_queue_work(&local->hw, &sdata->work);
 51 }
 52 
 53 /**
 54  * mesh_matches_local - check if the config of a mesh point matches ours
 55  *
 56  * @sdata: local mesh subif
 57  * @ie: information elements of a management frame from the mesh peer
 58  *
 59  * This function checks if the mesh configuration of a mesh point matches the
 60  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
 61  */
 62 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
 63                         struct ieee802_11_elems *ie)
 64 {
 65         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 66         u32 basic_rates = 0;
 67         struct cfg80211_chan_def sta_chan_def;
 68         struct ieee80211_supported_band *sband;
 69 
 70         /*
 71          * As support for each feature is added, check for matching
 72          * - On mesh config capabilities
 73          *   - Power Save Support En
 74          *   - Sync support enabled
 75          *   - Sync support active
 76          *   - Sync support required from peer
 77          *   - MDA enabled
 78          * - Power management control on fc
 79          */
 80         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
 81              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
 82              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
 83              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
 84              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
 85              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
 86              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
 87                 return false;
 88 
 89         sband = ieee80211_get_sband(sdata);
 90         if (!sband)
 91                 return false;
 92 
 93         ieee80211_sta_get_rates(sdata, ie, sband->band,
 94                                 &basic_rates);
 95 
 96         if (sdata->vif.bss_conf.basic_rates != basic_rates)
 97                 return false;
 98 
 99         cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
100                                 NL80211_CHAN_NO_HT);
101         ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
102         ieee80211_chandef_vht_oper(&sdata->local->hw,
103                                    ie->vht_operation, ie->ht_operation,
104                                    &sta_chan_def);
105 
106         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
107                                          &sta_chan_def))
108                 return false;
109 
110         return true;
111 }
112 
113 /**
114  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
115  *
116  * @ie: information elements of a management frame from the mesh peer
117  */
118 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
119 {
120         return (ie->mesh_config->meshconf_cap &
121                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
122 }
123 
124 /**
125  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
126  *
127  * @sdata: mesh interface in which mesh beacons are going to be updated
128  *
129  * Returns: beacon changed flag if the beacon content changed.
130  */
131 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
132 {
133         bool free_plinks;
134         u32 changed = 0;
135 
136         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
137          * the mesh interface might be able to establish plinks with peers that
138          * are already on the table but are not on PLINK_ESTAB state. However,
139          * in general the mesh interface is not accepting peer link requests
140          * from new peers, and that must be reflected in the beacon
141          */
142         free_plinks = mesh_plink_availables(sdata);
143 
144         if (free_plinks != sdata->u.mesh.accepting_plinks) {
145                 sdata->u.mesh.accepting_plinks = free_plinks;
146                 changed = BSS_CHANGED_BEACON;
147         }
148 
149         return changed;
150 }
151 
152 /*
153  * mesh_sta_cleanup - clean up any mesh sta state
154  *
155  * @sta: mesh sta to clean up.
156  */
157 void mesh_sta_cleanup(struct sta_info *sta)
158 {
159         struct ieee80211_sub_if_data *sdata = sta->sdata;
160         u32 changed = mesh_plink_deactivate(sta);
161 
162         if (changed)
163                 ieee80211_mbss_info_change_notify(sdata, changed);
164 }
165 
166 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
167 {
168         int i;
169 
170         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
171         if (!sdata->u.mesh.rmc)
172                 return -ENOMEM;
173         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
174         for (i = 0; i < RMC_BUCKETS; i++)
175                 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
176         return 0;
177 }
178 
179 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
180 {
181         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
182         struct rmc_entry *p;
183         struct hlist_node *n;
184         int i;
185 
186         if (!sdata->u.mesh.rmc)
187                 return;
188 
189         for (i = 0; i < RMC_BUCKETS; i++) {
190                 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
191                         hlist_del(&p->list);
192                         kmem_cache_free(rm_cache, p);
193                 }
194         }
195 
196         kfree(rmc);
197         sdata->u.mesh.rmc = NULL;
198 }
199 
200 /**
201  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
202  *
203  * @sdata:      interface
204  * @sa:         source address
205  * @mesh_hdr:   mesh_header
206  *
207  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
208  *
209  * Checks using the source address and the mesh sequence number if we have
210  * received this frame lately. If the frame is not in the cache, it is added to
211  * it.
212  */
213 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
214                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
215 {
216         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
217         u32 seqnum = 0;
218         int entries = 0;
219         u8 idx;
220         struct rmc_entry *p;
221         struct hlist_node *n;
222 
223         if (!rmc)
224                 return -1;
225 
226         /* Don't care about endianness since only match matters */
227         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
228         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
229         hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
230                 ++entries;
231                 if (time_after(jiffies, p->exp_time) ||
232                     entries == RMC_QUEUE_MAX_LEN) {
233                         hlist_del(&p->list);
234                         kmem_cache_free(rm_cache, p);
235                         --entries;
236                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
237                         return -1;
238         }
239 
240         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
241         if (!p)
242                 return 0;
243 
244         p->seqnum = seqnum;
245         p->exp_time = jiffies + RMC_TIMEOUT;
246         memcpy(p->sa, sa, ETH_ALEN);
247         hlist_add_head(&p->list, &rmc->bucket[idx]);
248         return 0;
249 }
250 
251 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
252                          struct sk_buff *skb)
253 {
254         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
255         u8 *pos, neighbors;
256         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
257         bool is_connected_to_gate = ifmsh->num_gates > 0 ||
258                 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
259                 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
260 
261         if (skb_tailroom(skb) < 2 + meshconf_len)
262                 return -ENOMEM;
263 
264         pos = skb_put(skb, 2 + meshconf_len);
265         *pos++ = WLAN_EID_MESH_CONFIG;
266         *pos++ = meshconf_len;
267 
268         /* save a pointer for quick updates in pre-tbtt */
269         ifmsh->meshconf_offset = pos - skb->data;
270 
271         /* Active path selection protocol ID */
272         *pos++ = ifmsh->mesh_pp_id;
273         /* Active path selection metric ID   */
274         *pos++ = ifmsh->mesh_pm_id;
275         /* Congestion control mode identifier */
276         *pos++ = ifmsh->mesh_cc_id;
277         /* Synchronization protocol identifier */
278         *pos++ = ifmsh->mesh_sp_id;
279         /* Authentication Protocol identifier */
280         *pos++ = ifmsh->mesh_auth_id;
281         /* Mesh Formation Info - number of neighbors */
282         neighbors = atomic_read(&ifmsh->estab_plinks);
283         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
284         *pos++ = (neighbors << 1) | is_connected_to_gate;
285         /* Mesh capability */
286         *pos = 0x00;
287         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
288                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
289         *pos |= ifmsh->accepting_plinks ?
290                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
291         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
292         *pos |= ifmsh->ps_peers_deep_sleep ?
293                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
294         return 0;
295 }
296 
297 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
298 {
299         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
300         u8 *pos;
301 
302         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
303                 return -ENOMEM;
304 
305         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
306         *pos++ = WLAN_EID_MESH_ID;
307         *pos++ = ifmsh->mesh_id_len;
308         if (ifmsh->mesh_id_len)
309                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
310 
311         return 0;
312 }
313 
314 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
315                                     struct sk_buff *skb)
316 {
317         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
318         u8 *pos;
319 
320         /* see IEEE802.11-2012 13.14.6 */
321         if (ifmsh->ps_peers_light_sleep == 0 &&
322             ifmsh->ps_peers_deep_sleep == 0 &&
323             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
324                 return 0;
325 
326         if (skb_tailroom(skb) < 4)
327                 return -ENOMEM;
328 
329         pos = skb_put(skb, 2 + 2);
330         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
331         *pos++ = 2;
332         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
333 
334         return 0;
335 }
336 
337 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
338                         struct sk_buff *skb)
339 {
340         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
341         u8 offset, len;
342         const u8 *data;
343 
344         if (!ifmsh->ie || !ifmsh->ie_len)
345                 return 0;
346 
347         /* fast-forward to vendor IEs */
348         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
349 
350         if (offset < ifmsh->ie_len) {
351                 len = ifmsh->ie_len - offset;
352                 data = ifmsh->ie + offset;
353                 if (skb_tailroom(skb) < len)
354                         return -ENOMEM;
355                 skb_put_data(skb, data, len);
356         }
357 
358         return 0;
359 }
360 
361 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
362 {
363         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
364         u8 len = 0;
365         const u8 *data;
366 
367         if (!ifmsh->ie || !ifmsh->ie_len)
368                 return 0;
369 
370         /* find RSN IE */
371         data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
372         if (!data)
373                 return 0;
374 
375         len = data[1] + 2;
376 
377         if (skb_tailroom(skb) < len)
378                 return -ENOMEM;
379         skb_put_data(skb, data, len);
380 
381         return 0;
382 }
383 
384 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
385                                  struct sk_buff *skb)
386 {
387         struct ieee80211_chanctx_conf *chanctx_conf;
388         struct ieee80211_channel *chan;
389         u8 *pos;
390 
391         if (skb_tailroom(skb) < 3)
392                 return -ENOMEM;
393 
394         rcu_read_lock();
395         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
396         if (WARN_ON(!chanctx_conf)) {
397                 rcu_read_unlock();
398                 return -EINVAL;
399         }
400         chan = chanctx_conf->def.chan;
401         rcu_read_unlock();
402 
403         pos = skb_put(skb, 2 + 1);
404         *pos++ = WLAN_EID_DS_PARAMS;
405         *pos++ = 1;
406         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
407 
408         return 0;
409 }
410 
411 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
412                        struct sk_buff *skb)
413 {
414         struct ieee80211_supported_band *sband;
415         u8 *pos;
416 
417         sband = ieee80211_get_sband(sdata);
418         if (!sband)
419                 return -EINVAL;
420 
421         if (!sband->ht_cap.ht_supported ||
422             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
423             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
424             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
425                 return 0;
426 
427         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
428                 return -ENOMEM;
429 
430         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
431         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
432 
433         return 0;
434 }
435 
436 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
437                         struct sk_buff *skb)
438 {
439         struct ieee80211_local *local = sdata->local;
440         struct ieee80211_chanctx_conf *chanctx_conf;
441         struct ieee80211_channel *channel;
442         struct ieee80211_supported_band *sband;
443         struct ieee80211_sta_ht_cap *ht_cap;
444         u8 *pos;
445 
446         rcu_read_lock();
447         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
448         if (WARN_ON(!chanctx_conf)) {
449                 rcu_read_unlock();
450                 return -EINVAL;
451         }
452         channel = chanctx_conf->def.chan;
453         rcu_read_unlock();
454 
455         sband = local->hw.wiphy->bands[channel->band];
456         ht_cap = &sband->ht_cap;
457 
458         if (!ht_cap->ht_supported ||
459             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
460             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
461             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
462                 return 0;
463 
464         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
465                 return -ENOMEM;
466 
467         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
468         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
469                                    sdata->vif.bss_conf.ht_operation_mode,
470                                    false);
471 
472         return 0;
473 }
474 
475 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
476                         struct sk_buff *skb)
477 {
478         struct ieee80211_supported_band *sband;
479         u8 *pos;
480 
481         sband = ieee80211_get_sband(sdata);
482         if (!sband)
483                 return -EINVAL;
484 
485         if (!sband->vht_cap.vht_supported ||
486             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
487             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
488             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
489                 return 0;
490 
491         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
492                 return -ENOMEM;
493 
494         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
495         ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
496 
497         return 0;
498 }
499 
500 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
501                          struct sk_buff *skb)
502 {
503         struct ieee80211_local *local = sdata->local;
504         struct ieee80211_chanctx_conf *chanctx_conf;
505         struct ieee80211_channel *channel;
506         struct ieee80211_supported_band *sband;
507         struct ieee80211_sta_vht_cap *vht_cap;
508         u8 *pos;
509 
510         rcu_read_lock();
511         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
512         if (WARN_ON(!chanctx_conf)) {
513                 rcu_read_unlock();
514                 return -EINVAL;
515         }
516         channel = chanctx_conf->def.chan;
517         rcu_read_unlock();
518 
519         sband = local->hw.wiphy->bands[channel->band];
520         vht_cap = &sband->vht_cap;
521 
522         if (!vht_cap->vht_supported ||
523             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
524             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
525             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
526                 return 0;
527 
528         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
529                 return -ENOMEM;
530 
531         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
532         ieee80211_ie_build_vht_oper(pos, vht_cap,
533                                     &sdata->vif.bss_conf.chandef);
534 
535         return 0;
536 }
537 
538 static void ieee80211_mesh_path_timer(struct timer_list *t)
539 {
540         struct ieee80211_sub_if_data *sdata =
541                 from_timer(sdata, t, u.mesh.mesh_path_timer);
542 
543         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
544 }
545 
546 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
547 {
548         struct ieee80211_sub_if_data *sdata =
549                 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
550         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
551 
552         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
553 
554         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
555 }
556 
557 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
558 {
559         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
560                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
561         else {
562                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
563                 /* stop running timer */
564                 del_timer_sync(&ifmsh->mesh_path_root_timer);
565         }
566 }
567 
568 /**
569  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
570  * @hdr:        802.11 frame header
571  * @fc:         frame control field
572  * @meshda:     destination address in the mesh
573  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
574  *              locally originated.
575  *
576  * Return the length of the 802.11 (does not include a mesh control header)
577  */
578 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
579                                   const u8 *meshda, const u8 *meshsa)
580 {
581         if (is_multicast_ether_addr(meshda)) {
582                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
583                 /* DA TA SA */
584                 memcpy(hdr->addr1, meshda, ETH_ALEN);
585                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
586                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
587                 return 24;
588         } else {
589                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
590                 /* RA TA DA SA */
591                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
592                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
593                 memcpy(hdr->addr3, meshda, ETH_ALEN);
594                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
595                 return 30;
596         }
597 }
598 
599 /**
600  * ieee80211_new_mesh_header - create a new mesh header
601  * @sdata:      mesh interface to be used
602  * @meshhdr:    uninitialized mesh header
603  * @addr4or5:   1st address in the ae header, which may correspond to address 4
604  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
605  *              be NULL.
606  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
607  *              mesh frame
608  *
609  * Return the header length.
610  */
611 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
612                                        struct ieee80211s_hdr *meshhdr,
613                                        const char *addr4or5, const char *addr6)
614 {
615         if (WARN_ON(!addr4or5 && addr6))
616                 return 0;
617 
618         memset(meshhdr, 0, sizeof(*meshhdr));
619 
620         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
621 
622         /* FIXME: racy -- TX on multiple queues can be concurrent */
623         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
624         sdata->u.mesh.mesh_seqnum++;
625 
626         if (addr4or5 && !addr6) {
627                 meshhdr->flags |= MESH_FLAGS_AE_A4;
628                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
629                 return 2 * ETH_ALEN;
630         } else if (addr4or5 && addr6) {
631                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
632                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
633                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
634                 return 3 * ETH_ALEN;
635         }
636 
637         return ETH_ALEN;
638 }
639 
640 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
641 {
642         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
643         u32 changed;
644 
645         if (ifmsh->mshcfg.plink_timeout > 0)
646                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
647         mesh_path_expire(sdata);
648 
649         changed = mesh_accept_plinks_update(sdata);
650         ieee80211_mbss_info_change_notify(sdata, changed);
651 
652         mod_timer(&ifmsh->housekeeping_timer,
653                   round_jiffies(jiffies +
654                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
655 }
656 
657 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
658 {
659         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
660         u32 interval;
661 
662         mesh_path_tx_root_frame(sdata);
663 
664         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
665                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
666         else
667                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
668 
669         mod_timer(&ifmsh->mesh_path_root_timer,
670                   round_jiffies(TU_TO_EXP_TIME(interval)));
671 }
672 
673 static int
674 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
675 {
676         struct beacon_data *bcn;
677         int head_len, tail_len;
678         struct sk_buff *skb;
679         struct ieee80211_mgmt *mgmt;
680         struct ieee80211_chanctx_conf *chanctx_conf;
681         struct mesh_csa_settings *csa;
682         enum nl80211_band band;
683         u8 *pos;
684         struct ieee80211_sub_if_data *sdata;
685         int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
686 
687         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
688         rcu_read_lock();
689         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
690         band = chanctx_conf->def.chan->band;
691         rcu_read_unlock();
692 
693         head_len = hdr_len +
694                    2 + /* NULL SSID */
695                    /* Channel Switch Announcement */
696                    2 + sizeof(struct ieee80211_channel_sw_ie) +
697                    /* Mesh Channel Switch Parameters */
698                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
699                    /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
700                    2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
701                    2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
702                    2 + 8 + /* supported rates */
703                    2 + 3; /* DS params */
704         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
705                    2 + sizeof(struct ieee80211_ht_cap) +
706                    2 + sizeof(struct ieee80211_ht_operation) +
707                    2 + ifmsh->mesh_id_len +
708                    2 + sizeof(struct ieee80211_meshconf_ie) +
709                    2 + sizeof(__le16) + /* awake window */
710                    2 + sizeof(struct ieee80211_vht_cap) +
711                    2 + sizeof(struct ieee80211_vht_operation) +
712                    ifmsh->ie_len;
713 
714         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
715         /* need an skb for IE builders to operate on */
716         skb = dev_alloc_skb(max(head_len, tail_len));
717 
718         if (!bcn || !skb)
719                 goto out_free;
720 
721         /*
722          * pointers go into the block we allocated,
723          * memory is | beacon_data | head | tail |
724          */
725         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
726 
727         /* fill in the head */
728         mgmt = skb_put_zero(skb, hdr_len);
729         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
730                                           IEEE80211_STYPE_BEACON);
731         eth_broadcast_addr(mgmt->da);
732         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
733         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
734         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
735         mgmt->u.beacon.beacon_int =
736                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
737         mgmt->u.beacon.capab_info |= cpu_to_le16(
738                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
739 
740         pos = skb_put(skb, 2);
741         *pos++ = WLAN_EID_SSID;
742         *pos++ = 0x0;
743 
744         rcu_read_lock();
745         csa = rcu_dereference(ifmsh->csa);
746         if (csa) {
747                 enum nl80211_channel_type ct;
748                 struct cfg80211_chan_def *chandef;
749                 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
750                              2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
751 
752                 pos = skb_put_zero(skb, ie_len);
753                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
754                 *pos++ = 3;
755                 *pos++ = 0x0;
756                 *pos++ = ieee80211_frequency_to_channel(
757                                 csa->settings.chandef.chan->center_freq);
758                 bcn->csa_current_counter = csa->settings.count;
759                 bcn->csa_counter_offsets[0] = hdr_len + 6;
760                 *pos++ = csa->settings.count;
761                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
762                 *pos++ = 6;
763                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
764                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
765                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
766                 } else {
767                         *pos++ = ifmsh->chsw_ttl;
768                 }
769                 *pos++ |= csa->settings.block_tx ?
770                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
771                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
772                 pos += 2;
773                 put_unaligned_le16(ifmsh->pre_value, pos);
774                 pos += 2;
775 
776                 switch (csa->settings.chandef.width) {
777                 case NL80211_CHAN_WIDTH_40:
778                         ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
779                         pos = skb_put_zero(skb, ie_len);
780 
781                         *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
782                         *pos++ = 1;                                 /* len */
783                         ct = cfg80211_get_chandef_type(&csa->settings.chandef);
784                         if (ct == NL80211_CHAN_HT40PLUS)
785                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
786                         else
787                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
788                         break;
789                 case NL80211_CHAN_WIDTH_80:
790                 case NL80211_CHAN_WIDTH_80P80:
791                 case NL80211_CHAN_WIDTH_160:
792                         /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
793                         ie_len = 2 + 2 +
794                                  sizeof(struct ieee80211_wide_bw_chansw_ie);
795                         pos = skb_put_zero(skb, ie_len);
796 
797                         *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
798                         *pos++ = 5;                               /* len */
799                         /* put sub IE */
800                         chandef = &csa->settings.chandef;
801                         ieee80211_ie_build_wide_bw_cs(pos, chandef);
802                         break;
803                 default:
804                         break;
805                 }
806         }
807         rcu_read_unlock();
808 
809         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
810             mesh_add_ds_params_ie(sdata, skb))
811                 goto out_free;
812 
813         bcn->head_len = skb->len;
814         memcpy(bcn->head, skb->data, bcn->head_len);
815 
816         /* now the tail */
817         skb_trim(skb, 0);
818         bcn->tail = bcn->head + bcn->head_len;
819 
820         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
821             mesh_add_rsn_ie(sdata, skb) ||
822             mesh_add_ht_cap_ie(sdata, skb) ||
823             mesh_add_ht_oper_ie(sdata, skb) ||
824             mesh_add_meshid_ie(sdata, skb) ||
825             mesh_add_meshconf_ie(sdata, skb) ||
826             mesh_add_awake_window_ie(sdata, skb) ||
827             mesh_add_vht_cap_ie(sdata, skb) ||
828             mesh_add_vht_oper_ie(sdata, skb) ||
829             mesh_add_vendor_ies(sdata, skb))
830                 goto out_free;
831 
832         bcn->tail_len = skb->len;
833         memcpy(bcn->tail, skb->data, bcn->tail_len);
834         bcn->meshconf = (struct ieee80211_meshconf_ie *)
835                                         (bcn->tail + ifmsh->meshconf_offset);
836 
837         dev_kfree_skb(skb);
838         rcu_assign_pointer(ifmsh->beacon, bcn);
839         return 0;
840 out_free:
841         kfree(bcn);
842         dev_kfree_skb(skb);
843         return -ENOMEM;
844 }
845 
846 static int
847 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
848 {
849         struct beacon_data *old_bcn;
850         int ret;
851 
852         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
853                                             lockdep_is_held(&sdata->wdev.mtx));
854         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
855         if (ret)
856                 /* just reuse old beacon */
857                 return ret;
858 
859         if (old_bcn)
860                 kfree_rcu(old_bcn, rcu_head);
861         return 0;
862 }
863 
864 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
865                                        u32 changed)
866 {
867         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
868         unsigned long bits = changed;
869         u32 bit;
870 
871         if (!bits)
872                 return;
873 
874         /* if we race with running work, worst case this work becomes a noop */
875         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
876                 set_bit(bit, &ifmsh->mbss_changed);
877         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
878         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
879 }
880 
881 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
882 {
883         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
884         struct ieee80211_local *local = sdata->local;
885         u32 changed = BSS_CHANGED_BEACON |
886                       BSS_CHANGED_BEACON_ENABLED |
887                       BSS_CHANGED_HT |
888                       BSS_CHANGED_BASIC_RATES |
889                       BSS_CHANGED_BEACON_INT |
890                       BSS_CHANGED_MCAST_RATE;
891 
892         local->fif_other_bss++;
893         /* mesh ifaces must set allmulti to forward mcast traffic */
894         atomic_inc(&local->iff_allmultis);
895         ieee80211_configure_filter(local);
896 
897         ifmsh->mesh_cc_id = 0;  /* Disabled */
898         /* register sync ops from extensible synchronization framework */
899         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
900         ifmsh->sync_offset_clockdrift_max = 0;
901         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
902         ieee80211_mesh_root_setup(ifmsh);
903         ieee80211_queue_work(&local->hw, &sdata->work);
904         sdata->vif.bss_conf.ht_operation_mode =
905                                 ifmsh->mshcfg.ht_opmode;
906         sdata->vif.bss_conf.enable_beacon = true;
907 
908         changed |= ieee80211_mps_local_status_update(sdata);
909 
910         if (ieee80211_mesh_build_beacon(ifmsh)) {
911                 ieee80211_stop_mesh(sdata);
912                 return -ENOMEM;
913         }
914 
915         ieee80211_recalc_dtim(local, sdata);
916         ieee80211_bss_info_change_notify(sdata, changed);
917 
918         netif_carrier_on(sdata->dev);
919         return 0;
920 }
921 
922 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
923 {
924         struct ieee80211_local *local = sdata->local;
925         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
926         struct beacon_data *bcn;
927 
928         netif_carrier_off(sdata->dev);
929 
930         /* flush STAs and mpaths on this iface */
931         sta_info_flush(sdata);
932         ieee80211_free_keys(sdata, true);
933         mesh_path_flush_by_iface(sdata);
934 
935         /* stop the beacon */
936         ifmsh->mesh_id_len = 0;
937         sdata->vif.bss_conf.enable_beacon = false;
938         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
939         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
940 
941         /* remove beacon */
942         bcn = rcu_dereference_protected(ifmsh->beacon,
943                                         lockdep_is_held(&sdata->wdev.mtx));
944         RCU_INIT_POINTER(ifmsh->beacon, NULL);
945         kfree_rcu(bcn, rcu_head);
946 
947         /* free all potentially still buffered group-addressed frames */
948         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
949         skb_queue_purge(&ifmsh->ps.bc_buf);
950 
951         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
952         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
953         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
954 
955         /* clear any mesh work (for next join) we may have accrued */
956         ifmsh->wrkq_flags = 0;
957         ifmsh->mbss_changed = 0;
958 
959         local->fif_other_bss--;
960         atomic_dec(&local->iff_allmultis);
961         ieee80211_configure_filter(local);
962 }
963 
964 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
965 {
966         int err;
967 
968         /* if the current channel is a DFS channel, mark the channel as
969          * unavailable.
970          */
971         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
972                                             &sdata->vif.bss_conf.chandef,
973                                             NL80211_IFTYPE_MESH_POINT);
974         if (err > 0)
975                 cfg80211_radar_event(sdata->local->hw.wiphy,
976                                      &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
977 }
978 
979 static bool
980 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
981                                  struct ieee802_11_elems *elems, bool beacon)
982 {
983         struct cfg80211_csa_settings params;
984         struct ieee80211_csa_ie csa_ie;
985         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
986         struct ieee80211_supported_band *sband;
987         int err;
988         u32 sta_flags;
989 
990         sdata_assert_lock(sdata);
991 
992         sband = ieee80211_get_sband(sdata);
993         if (!sband)
994                 return false;
995 
996         sta_flags = 0;
997         switch (sdata->vif.bss_conf.chandef.width) {
998         case NL80211_CHAN_WIDTH_20_NOHT:
999                 sta_flags |= IEEE80211_STA_DISABLE_HT;
1000                 /* fall through */
1001         case NL80211_CHAN_WIDTH_20:
1002                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
1003                 /* fall through */
1004         case NL80211_CHAN_WIDTH_40:
1005                 sta_flags |= IEEE80211_STA_DISABLE_VHT;
1006                 break;
1007         default:
1008                 break;
1009         }
1010 
1011         memset(&params, 0, sizeof(params));
1012         err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1013                                            sta_flags, sdata->vif.addr,
1014                                            &csa_ie);
1015         if (err < 0)
1016                 return false;
1017         if (err)
1018                 return false;
1019 
1020         /* Mark the channel unavailable if the reason for the switch is
1021          * regulatory.
1022          */
1023         if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1024                 ieee80211_mesh_csa_mark_radar(sdata);
1025 
1026         params.chandef = csa_ie.chandef;
1027         params.count = csa_ie.count;
1028 
1029         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1030                                      IEEE80211_CHAN_DISABLED) ||
1031             !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1032                                      NL80211_IFTYPE_MESH_POINT)) {
1033                 sdata_info(sdata,
1034                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1035                            sdata->vif.addr,
1036                            params.chandef.chan->center_freq,
1037                            params.chandef.width,
1038                            params.chandef.center_freq1,
1039                            params.chandef.center_freq2);
1040                 return false;
1041         }
1042 
1043         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1044                                             &params.chandef,
1045                                             NL80211_IFTYPE_MESH_POINT);
1046         if (err < 0)
1047                 return false;
1048         if (err > 0 && !ifmsh->userspace_handles_dfs) {
1049                 sdata_info(sdata,
1050                            "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1051                            sdata->vif.addr,
1052                            params.chandef.chan->center_freq,
1053                            params.chandef.width,
1054                            params.chandef.center_freq1,
1055                            params.chandef.center_freq2);
1056                 return false;
1057         }
1058 
1059         params.radar_required = err;
1060 
1061         if (cfg80211_chandef_identical(&params.chandef,
1062                                        &sdata->vif.bss_conf.chandef)) {
1063                 mcsa_dbg(sdata,
1064                          "received csa with an identical chandef, ignoring\n");
1065                 return true;
1066         }
1067 
1068         mcsa_dbg(sdata,
1069                  "received channel switch announcement to go to channel %d MHz\n",
1070                  params.chandef.chan->center_freq);
1071 
1072         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1073         if (beacon) {
1074                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1075                 if (ifmsh->pre_value >= csa_ie.pre_value)
1076                         return false;
1077                 ifmsh->pre_value = csa_ie.pre_value;
1078         }
1079 
1080         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1081                 return false;
1082 
1083         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1084 
1085         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1086                                      &params) < 0)
1087                 return false;
1088 
1089         return true;
1090 }
1091 
1092 static void
1093 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1094                             struct ieee80211_mgmt *mgmt, size_t len)
1095 {
1096         struct ieee80211_local *local = sdata->local;
1097         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1098         struct sk_buff *presp;
1099         struct beacon_data *bcn;
1100         struct ieee80211_mgmt *hdr;
1101         struct ieee802_11_elems elems;
1102         size_t baselen;
1103         u8 *pos;
1104 
1105         pos = mgmt->u.probe_req.variable;
1106         baselen = (u8 *) pos - (u8 *) mgmt;
1107         if (baselen > len)
1108                 return;
1109 
1110         ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid,
1111                                NULL);
1112 
1113         if (!elems.mesh_id)
1114                 return;
1115 
1116         /* 802.11-2012 10.1.4.3.2 */
1117         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1118              !is_broadcast_ether_addr(mgmt->da)) ||
1119             elems.ssid_len != 0)
1120                 return;
1121 
1122         if (elems.mesh_id_len != 0 &&
1123             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1124              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1125                 return;
1126 
1127         rcu_read_lock();
1128         bcn = rcu_dereference(ifmsh->beacon);
1129 
1130         if (!bcn)
1131                 goto out;
1132 
1133         presp = dev_alloc_skb(local->tx_headroom +
1134                               bcn->head_len + bcn->tail_len);
1135         if (!presp)
1136                 goto out;
1137 
1138         skb_reserve(presp, local->tx_headroom);
1139         skb_put_data(presp, bcn->head, bcn->head_len);
1140         skb_put_data(presp, bcn->tail, bcn->tail_len);
1141         hdr = (struct ieee80211_mgmt *) presp->data;
1142         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1143                                          IEEE80211_STYPE_PROBE_RESP);
1144         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1145         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1146         ieee80211_tx_skb(sdata, presp);
1147 out:
1148         rcu_read_unlock();
1149 }
1150 
1151 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1152                                         u16 stype,
1153                                         struct ieee80211_mgmt *mgmt,
1154                                         size_t len,
1155                                         struct ieee80211_rx_status *rx_status)
1156 {
1157         struct ieee80211_local *local = sdata->local;
1158         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1159         struct ieee802_11_elems elems;
1160         struct ieee80211_channel *channel;
1161         size_t baselen;
1162         int freq;
1163         enum nl80211_band band = rx_status->band;
1164 
1165         /* ignore ProbeResp to foreign address */
1166         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1167             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1168                 return;
1169 
1170         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1171         if (baselen > len)
1172                 return;
1173 
1174         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1175                                false, &elems, mgmt->bssid, NULL);
1176 
1177         /* ignore non-mesh or secure / unsecure mismatch */
1178         if ((!elems.mesh_id || !elems.mesh_config) ||
1179             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1180             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1181                 return;
1182 
1183         if (elems.ds_params)
1184                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1185         else
1186                 freq = rx_status->freq;
1187 
1188         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1189 
1190         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1191                 return;
1192 
1193         if (mesh_matches_local(sdata, &elems)) {
1194                 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1195                         sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1196                 if (!sdata->u.mesh.user_mpm ||
1197                     sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1198                     sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1199                         mesh_neighbour_update(sdata, mgmt->sa, &elems,
1200                                               rx_status);
1201         }
1202 
1203         if (ifmsh->sync_ops)
1204                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1205                         stype, mgmt, &elems, rx_status);
1206 
1207         if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1208             !sdata->vif.csa_active)
1209                 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1210 }
1211 
1212 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1213 {
1214         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1215         struct mesh_csa_settings *tmp_csa_settings;
1216         int ret = 0;
1217         int changed = 0;
1218 
1219         /* Reset the TTL value and Initiator flag */
1220         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1221         ifmsh->chsw_ttl = 0;
1222 
1223         /* Remove the CSA and MCSP elements from the beacon */
1224         tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
1225                                             lockdep_is_held(&sdata->wdev.mtx));
1226         RCU_INIT_POINTER(ifmsh->csa, NULL);
1227         if (tmp_csa_settings)
1228                 kfree_rcu(tmp_csa_settings, rcu_head);
1229         ret = ieee80211_mesh_rebuild_beacon(sdata);
1230         if (ret)
1231                 return -EINVAL;
1232 
1233         changed |= BSS_CHANGED_BEACON;
1234 
1235         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1236                  sdata->vif.bss_conf.chandef.chan->center_freq);
1237         return changed;
1238 }
1239 
1240 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1241                               struct cfg80211_csa_settings *csa_settings)
1242 {
1243         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1244         struct mesh_csa_settings *tmp_csa_settings;
1245         int ret = 0;
1246 
1247         lockdep_assert_held(&sdata->wdev.mtx);
1248 
1249         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1250                                    GFP_ATOMIC);
1251         if (!tmp_csa_settings)
1252                 return -ENOMEM;
1253 
1254         memcpy(&tmp_csa_settings->settings, csa_settings,
1255                sizeof(struct cfg80211_csa_settings));
1256 
1257         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1258 
1259         ret = ieee80211_mesh_rebuild_beacon(sdata);
1260         if (ret) {
1261                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1262                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1263                 kfree_rcu(tmp_csa_settings, rcu_head);
1264                 return ret;
1265         }
1266 
1267         return BSS_CHANGED_BEACON;
1268 }
1269 
1270 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1271                                struct ieee80211_mgmt *mgmt, size_t len,
1272                                struct ieee802_11_elems *elems)
1273 {
1274         struct ieee80211_mgmt *mgmt_fwd;
1275         struct sk_buff *skb;
1276         struct ieee80211_local *local = sdata->local;
1277 
1278         skb = dev_alloc_skb(local->tx_headroom + len);
1279         if (!skb)
1280                 return -ENOMEM;
1281         skb_reserve(skb, local->tx_headroom);
1282         mgmt_fwd = skb_put(skb, len);
1283 
1284         elems->mesh_chansw_params_ie->mesh_ttl--;
1285         elems->mesh_chansw_params_ie->mesh_flags &=
1286                 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1287 
1288         memcpy(mgmt_fwd, mgmt, len);
1289         eth_broadcast_addr(mgmt_fwd->da);
1290         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1291         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1292 
1293         ieee80211_tx_skb(sdata, skb);
1294         return 0;
1295 }
1296 
1297 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1298                               struct ieee80211_mgmt *mgmt, size_t len)
1299 {
1300         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1301         struct ieee802_11_elems elems;
1302         u16 pre_value;
1303         bool fwd_csa = true;
1304         size_t baselen;
1305         u8 *pos;
1306 
1307         if (mgmt->u.action.u.measurement.action_code !=
1308             WLAN_ACTION_SPCT_CHL_SWITCH)
1309                 return;
1310 
1311         pos = mgmt->u.action.u.chan_switch.variable;
1312         baselen = offsetof(struct ieee80211_mgmt,
1313                            u.action.u.chan_switch.variable);
1314         ieee802_11_parse_elems(pos, len - baselen, true, &elems,
1315                                mgmt->bssid, NULL);
1316 
1317         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1318         if (!--ifmsh->chsw_ttl)
1319                 fwd_csa = false;
1320 
1321         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1322         if (ifmsh->pre_value >= pre_value)
1323                 return;
1324 
1325         ifmsh->pre_value = pre_value;
1326 
1327         if (!sdata->vif.csa_active &&
1328             !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1329                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1330                 return;
1331         }
1332 
1333         /* forward or re-broadcast the CSA frame */
1334         if (fwd_csa) {
1335                 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0)
1336                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1337         }
1338 }
1339 
1340 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1341                                           struct ieee80211_mgmt *mgmt,
1342                                           size_t len,
1343                                           struct ieee80211_rx_status *rx_status)
1344 {
1345         switch (mgmt->u.action.category) {
1346         case WLAN_CATEGORY_SELF_PROTECTED:
1347                 switch (mgmt->u.action.u.self_prot.action_code) {
1348                 case WLAN_SP_MESH_PEERING_OPEN:
1349                 case WLAN_SP_MESH_PEERING_CLOSE:
1350                 case WLAN_SP_MESH_PEERING_CONFIRM:
1351                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1352                         break;
1353                 }
1354                 break;
1355         case WLAN_CATEGORY_MESH_ACTION:
1356                 if (mesh_action_is_path_sel(mgmt))
1357                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1358                 break;
1359         case WLAN_CATEGORY_SPECTRUM_MGMT:
1360                 mesh_rx_csa_frame(sdata, mgmt, len);
1361                 break;
1362         }
1363 }
1364 
1365 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1366                                    struct sk_buff *skb)
1367 {
1368         struct ieee80211_rx_status *rx_status;
1369         struct ieee80211_mgmt *mgmt;
1370         u16 stype;
1371 
1372         sdata_lock(sdata);
1373 
1374         /* mesh already went down */
1375         if (!sdata->u.mesh.mesh_id_len)
1376                 goto out;
1377 
1378         rx_status = IEEE80211_SKB_RXCB(skb);
1379         mgmt = (struct ieee80211_mgmt *) skb->data;
1380         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1381 
1382         switch (stype) {
1383         case IEEE80211_STYPE_PROBE_RESP:
1384         case IEEE80211_STYPE_BEACON:
1385                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1386                                             rx_status);
1387                 break;
1388         case IEEE80211_STYPE_PROBE_REQ:
1389                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1390                 break;
1391         case IEEE80211_STYPE_ACTION:
1392                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1393                 break;
1394         }
1395 out:
1396         sdata_unlock(sdata);
1397 }
1398 
1399 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1400 {
1401         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1402         u32 bit, changed = 0;
1403 
1404         for_each_set_bit(bit, &ifmsh->mbss_changed,
1405                          sizeof(changed) * BITS_PER_BYTE) {
1406                 clear_bit(bit, &ifmsh->mbss_changed);
1407                 changed |= BIT(bit);
1408         }
1409 
1410         if (sdata->vif.bss_conf.enable_beacon &&
1411             (changed & (BSS_CHANGED_BEACON |
1412                         BSS_CHANGED_HT |
1413                         BSS_CHANGED_BASIC_RATES |
1414                         BSS_CHANGED_BEACON_INT)))
1415                 if (ieee80211_mesh_rebuild_beacon(sdata))
1416                         return;
1417 
1418         ieee80211_bss_info_change_notify(sdata, changed);
1419 }
1420 
1421 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1422 {
1423         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1424 
1425         sdata_lock(sdata);
1426 
1427         /* mesh already went down */
1428         if (!sdata->u.mesh.mesh_id_len)
1429                 goto out;
1430 
1431         if (ifmsh->preq_queue_len &&
1432             time_after(jiffies,
1433                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1434                 mesh_path_start_discovery(sdata);
1435 
1436         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1437                 ieee80211_mesh_housekeeping(sdata);
1438 
1439         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1440                 ieee80211_mesh_rootpath(sdata);
1441 
1442         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1443                 mesh_sync_adjust_tsf(sdata);
1444 
1445         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1446                 mesh_bss_info_changed(sdata);
1447 out:
1448         sdata_unlock(sdata);
1449 }
1450 
1451 
1452 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1453 {
1454         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1455         static u8 zero_addr[ETH_ALEN] = {};
1456 
1457         timer_setup(&ifmsh->housekeeping_timer,
1458                     ieee80211_mesh_housekeeping_timer, 0);
1459 
1460         ifmsh->accepting_plinks = true;
1461         atomic_set(&ifmsh->mpaths, 0);
1462         mesh_rmc_init(sdata);
1463         ifmsh->last_preq = jiffies;
1464         ifmsh->next_perr = jiffies;
1465         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1466         /* Allocate all mesh structures when creating the first mesh interface. */
1467         if (!mesh_allocated)
1468                 ieee80211s_init();
1469 
1470         mesh_pathtbl_init(sdata);
1471 
1472         timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1473         timer_setup(&ifmsh->mesh_path_root_timer,
1474                     ieee80211_mesh_path_root_timer, 0);
1475         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1476         skb_queue_head_init(&ifmsh->ps.bc_buf);
1477         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1478         spin_lock_init(&ifmsh->sync_offset_lock);
1479         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1480 
1481         sdata->vif.bss_conf.bssid = zero_addr;
1482 }
1483 
1484 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1485 {
1486         mesh_rmc_free(sdata);
1487         mesh_pathtbl_unregister(sdata);
1488 }
1489 

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