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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  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
  4  *             Javier Cardona <javier@cozybit.com>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #include <linux/slab.h>
 12 #include <asm/unaligned.h>
 13 #include "ieee80211_i.h"
 14 #include "mesh.h"
 15 #include "driver-ops.h"
 16 
 17 static int mesh_allocated;
 18 static struct kmem_cache *rm_cache;
 19 
 20 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
 21 {
 22         return (mgmt->u.action.u.mesh_action.action_code ==
 23                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
 24 }
 25 
 26 void ieee80211s_init(void)
 27 {
 28         mesh_pathtbl_init();
 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         mesh_pathtbl_unregister();
 39         kmem_cache_destroy(rm_cache);
 40 }
 41 
 42 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
 43 {
 44         struct ieee80211_sub_if_data *sdata = (void *) data;
 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 
 69         /*
 70          * As support for each feature is added, check for matching
 71          * - On mesh config capabilities
 72          *   - Power Save Support En
 73          *   - Sync support enabled
 74          *   - Sync support active
 75          *   - Sync support required from peer
 76          *   - MDA enabled
 77          * - Power management control on fc
 78          */
 79         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
 80              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
 81              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
 82              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
 83              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
 84              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
 85              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
 86                 return false;
 87 
 88         ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata),
 89                                 &basic_rates);
 90 
 91         if (sdata->vif.bss_conf.basic_rates != basic_rates)
 92                 return false;
 93 
 94         ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
 95                                      ie->ht_operation, &sta_chan_def);
 96 
 97         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 98                                          &sta_chan_def))
 99                 return false;
100 
101         return true;
102 }
103 
104 /**
105  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
106  *
107  * @ie: information elements of a management frame from the mesh peer
108  */
109 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
110 {
111         return (ie->mesh_config->meshconf_cap &
112                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
113 }
114 
115 /**
116  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
117  *
118  * @sdata: mesh interface in which mesh beacons are going to be updated
119  *
120  * Returns: beacon changed flag if the beacon content changed.
121  */
122 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
123 {
124         bool free_plinks;
125         u32 changed = 0;
126 
127         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
128          * the mesh interface might be able to establish plinks with peers that
129          * are already on the table but are not on PLINK_ESTAB state. However,
130          * in general the mesh interface is not accepting peer link requests
131          * from new peers, and that must be reflected in the beacon
132          */
133         free_plinks = mesh_plink_availables(sdata);
134 
135         if (free_plinks != sdata->u.mesh.accepting_plinks) {
136                 sdata->u.mesh.accepting_plinks = free_plinks;
137                 changed = BSS_CHANGED_BEACON;
138         }
139 
140         return changed;
141 }
142 
143 /*
144  * mesh_sta_cleanup - clean up any mesh sta state
145  *
146  * @sta: mesh sta to clean up.
147  */
148 void mesh_sta_cleanup(struct sta_info *sta)
149 {
150         struct ieee80211_sub_if_data *sdata = sta->sdata;
151         u32 changed;
152 
153         /*
154          * maybe userspace handles peer allocation and peering, but in either
155          * case the beacon is still generated by the kernel and we might need
156          * an update.
157          */
158         changed = mesh_accept_plinks_update(sdata);
159         if (!sdata->u.mesh.user_mpm) {
160                 changed |= mesh_plink_deactivate(sta);
161                 del_timer_sync(&sta->plink_timer);
162         }
163 
164         if (changed)
165                 ieee80211_mbss_info_change_notify(sdata, changed);
166 }
167 
168 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
169 {
170         int i;
171 
172         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
173         if (!sdata->u.mesh.rmc)
174                 return -ENOMEM;
175         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
176         for (i = 0; i < RMC_BUCKETS; i++)
177                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
178         return 0;
179 }
180 
181 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
182 {
183         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
184         struct rmc_entry *p, *n;
185         int i;
186 
187         if (!sdata->u.mesh.rmc)
188                 return;
189 
190         for (i = 0; i < RMC_BUCKETS; i++) {
191                 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
192                         list_del(&p->list);
193                         kmem_cache_free(rm_cache, p);
194                 }
195         }
196 
197         kfree(rmc);
198         sdata->u.mesh.rmc = NULL;
199 }
200 
201 /**
202  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
203  *
204  * @sdata:      interface
205  * @sa:         source address
206  * @mesh_hdr:   mesh_header
207  *
208  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
209  *
210  * Checks using the source address and the mesh sequence number if we have
211  * received this frame lately. If the frame is not in the cache, it is added to
212  * it.
213  */
214 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
215                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
216 {
217         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
218         u32 seqnum = 0;
219         int entries = 0;
220         u8 idx;
221         struct rmc_entry *p, *n;
222 
223         /* Don't care about endianness since only match matters */
224         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
225         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
226         list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
227                 ++entries;
228                 if (time_after(jiffies, p->exp_time) ||
229                     entries == RMC_QUEUE_MAX_LEN) {
230                         list_del(&p->list);
231                         kmem_cache_free(rm_cache, p);
232                         --entries;
233                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
234                         return -1;
235         }
236 
237         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
238         if (!p)
239                 return 0;
240 
241         p->seqnum = seqnum;
242         p->exp_time = jiffies + RMC_TIMEOUT;
243         memcpy(p->sa, sa, ETH_ALEN);
244         list_add(&p->list, &rmc->bucket[idx]);
245         return 0;
246 }
247 
248 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
249                          struct sk_buff *skb)
250 {
251         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
252         u8 *pos, neighbors;
253         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
254 
255         if (skb_tailroom(skb) < 2 + meshconf_len)
256                 return -ENOMEM;
257 
258         pos = skb_put(skb, 2 + meshconf_len);
259         *pos++ = WLAN_EID_MESH_CONFIG;
260         *pos++ = meshconf_len;
261 
262         /* Active path selection protocol ID */
263         *pos++ = ifmsh->mesh_pp_id;
264         /* Active path selection metric ID   */
265         *pos++ = ifmsh->mesh_pm_id;
266         /* Congestion control mode identifier */
267         *pos++ = ifmsh->mesh_cc_id;
268         /* Synchronization protocol identifier */
269         *pos++ = ifmsh->mesh_sp_id;
270         /* Authentication Protocol identifier */
271         *pos++ = ifmsh->mesh_auth_id;
272         /* Mesh Formation Info - number of neighbors */
273         neighbors = atomic_read(&ifmsh->estab_plinks);
274         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
275         *pos++ = neighbors << 1;
276         /* Mesh capability */
277         *pos = 0x00;
278         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
279                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
280         *pos |= ifmsh->accepting_plinks ?
281                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
282         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
283         *pos |= ifmsh->ps_peers_deep_sleep ?
284                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
285         *pos++ |= ifmsh->adjusting_tbtt ?
286                         IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
287         *pos++ = 0x00;
288 
289         return 0;
290 }
291 
292 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
293 {
294         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
295         u8 *pos;
296 
297         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
298                 return -ENOMEM;
299 
300         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
301         *pos++ = WLAN_EID_MESH_ID;
302         *pos++ = ifmsh->mesh_id_len;
303         if (ifmsh->mesh_id_len)
304                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
305 
306         return 0;
307 }
308 
309 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
310                                     struct sk_buff *skb)
311 {
312         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
313         u8 *pos;
314 
315         /* see IEEE802.11-2012 13.14.6 */
316         if (ifmsh->ps_peers_light_sleep == 0 &&
317             ifmsh->ps_peers_deep_sleep == 0 &&
318             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
319                 return 0;
320 
321         if (skb_tailroom(skb) < 4)
322                 return -ENOMEM;
323 
324         pos = skb_put(skb, 2 + 2);
325         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
326         *pos++ = 2;
327         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
328 
329         return 0;
330 }
331 
332 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
333                         struct sk_buff *skb)
334 {
335         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
336         u8 offset, len;
337         const u8 *data;
338 
339         if (!ifmsh->ie || !ifmsh->ie_len)
340                 return 0;
341 
342         /* fast-forward to vendor IEs */
343         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
344 
345         if (offset) {
346                 len = ifmsh->ie_len - offset;
347                 data = ifmsh->ie + offset;
348                 if (skb_tailroom(skb) < len)
349                         return -ENOMEM;
350                 memcpy(skb_put(skb, len), data, len);
351         }
352 
353         return 0;
354 }
355 
356 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
357 {
358         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
359         u8 len = 0;
360         const u8 *data;
361 
362         if (!ifmsh->ie || !ifmsh->ie_len)
363                 return 0;
364 
365         /* find RSN IE */
366         data = ifmsh->ie;
367         while (data < ifmsh->ie + ifmsh->ie_len) {
368                 if (*data == WLAN_EID_RSN) {
369                         len = data[1] + 2;
370                         break;
371                 }
372                 data++;
373         }
374 
375         if (len) {
376                 if (skb_tailroom(skb) < len)
377                         return -ENOMEM;
378                 memcpy(skb_put(skb, len), data, len);
379         }
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_local *local = sdata->local;
415         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
416         struct ieee80211_supported_band *sband;
417         u8 *pos;
418 
419         sband = local->hw.wiphy->bands[band];
420         if (!sband->ht_cap.ht_supported ||
421             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
422             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
423             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
424                 return 0;
425 
426         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
427                 return -ENOMEM;
428 
429         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
430         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
431 
432         return 0;
433 }
434 
435 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
436                         struct sk_buff *skb)
437 {
438         struct ieee80211_local *local = sdata->local;
439         struct ieee80211_chanctx_conf *chanctx_conf;
440         struct ieee80211_channel *channel;
441         enum nl80211_channel_type channel_type =
442                 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
443         struct ieee80211_supported_band *sband;
444         struct ieee80211_sta_ht_cap *ht_cap;
445         u8 *pos;
446 
447         rcu_read_lock();
448         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
449         if (WARN_ON(!chanctx_conf)) {
450                 rcu_read_unlock();
451                 return -EINVAL;
452         }
453         channel = chanctx_conf->def.chan;
454         rcu_read_unlock();
455 
456         sband = local->hw.wiphy->bands[channel->band];
457         ht_cap = &sband->ht_cap;
458 
459         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
460                 return 0;
461 
462         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
463                 return -ENOMEM;
464 
465         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
466         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
467                                    sdata->vif.bss_conf.ht_operation_mode);
468 
469         return 0;
470 }
471 
472 static void ieee80211_mesh_path_timer(unsigned long data)
473 {
474         struct ieee80211_sub_if_data *sdata =
475                 (struct ieee80211_sub_if_data *) data;
476 
477         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
478 }
479 
480 static void ieee80211_mesh_path_root_timer(unsigned long data)
481 {
482         struct ieee80211_sub_if_data *sdata =
483                 (struct ieee80211_sub_if_data *) data;
484         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
485 
486         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
487 
488         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
489 }
490 
491 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
492 {
493         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
494                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
495         else {
496                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
497                 /* stop running timer */
498                 del_timer_sync(&ifmsh->mesh_path_root_timer);
499         }
500 }
501 
502 /**
503  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
504  * @hdr:        802.11 frame header
505  * @fc:         frame control field
506  * @meshda:     destination address in the mesh
507  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
508  *              locally originated.
509  *
510  * Return the length of the 802.11 (does not include a mesh control header)
511  */
512 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
513                                   const u8 *meshda, const u8 *meshsa)
514 {
515         if (is_multicast_ether_addr(meshda)) {
516                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
517                 /* DA TA SA */
518                 memcpy(hdr->addr1, meshda, ETH_ALEN);
519                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
520                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
521                 return 24;
522         } else {
523                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
524                 /* RA TA DA SA */
525                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
526                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
527                 memcpy(hdr->addr3, meshda, ETH_ALEN);
528                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
529                 return 30;
530         }
531 }
532 
533 /**
534  * ieee80211_new_mesh_header - create a new mesh header
535  * @sdata:      mesh interface to be used
536  * @meshhdr:    uninitialized mesh header
537  * @addr4or5:   1st address in the ae header, which may correspond to address 4
538  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
539  *              be NULL.
540  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
541  *              mesh frame
542  *
543  * Return the header length.
544  */
545 int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
546                               struct ieee80211s_hdr *meshhdr,
547                               const char *addr4or5, const char *addr6)
548 {
549         if (WARN_ON(!addr4or5 && addr6))
550                 return 0;
551 
552         memset(meshhdr, 0, sizeof(*meshhdr));
553 
554         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
555 
556         /* FIXME: racy -- TX on multiple queues can be concurrent */
557         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
558         sdata->u.mesh.mesh_seqnum++;
559 
560         if (addr4or5 && !addr6) {
561                 meshhdr->flags |= MESH_FLAGS_AE_A4;
562                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
563                 return 2 * ETH_ALEN;
564         } else if (addr4or5 && addr6) {
565                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
566                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
567                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
568                 return 3 * ETH_ALEN;
569         }
570 
571         return ETH_ALEN;
572 }
573 
574 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
575 {
576         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
577         u32 changed;
578 
579         ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
580         mesh_path_expire(sdata);
581 
582         changed = mesh_accept_plinks_update(sdata);
583         ieee80211_mbss_info_change_notify(sdata, changed);
584 
585         mod_timer(&ifmsh->housekeeping_timer,
586                   round_jiffies(jiffies +
587                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
588 }
589 
590 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
591 {
592         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
593         u32 interval;
594 
595         mesh_path_tx_root_frame(sdata);
596 
597         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
598                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
599         else
600                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
601 
602         mod_timer(&ifmsh->mesh_path_root_timer,
603                   round_jiffies(TU_TO_EXP_TIME(interval)));
604 }
605 
606 static int
607 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
608 {
609         struct beacon_data *bcn;
610         int head_len, tail_len;
611         struct sk_buff *skb;
612         struct ieee80211_mgmt *mgmt;
613         struct ieee80211_chanctx_conf *chanctx_conf;
614         struct mesh_csa_settings *csa;
615         enum ieee80211_band band;
616         u8 *pos;
617         struct ieee80211_sub_if_data *sdata;
618         int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
619                       sizeof(mgmt->u.beacon);
620 
621         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
622         rcu_read_lock();
623         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
624         band = chanctx_conf->def.chan->band;
625         rcu_read_unlock();
626 
627         head_len = hdr_len +
628                    2 + /* NULL SSID */
629                    /* Channel Switch Announcement */
630                    2 + sizeof(struct ieee80211_channel_sw_ie) +
631                    /* Mesh Channel Swith Parameters */
632                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
633                    2 + 8 + /* supported rates */
634                    2 + 3; /* DS params */
635         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
636                    2 + sizeof(struct ieee80211_ht_cap) +
637                    2 + sizeof(struct ieee80211_ht_operation) +
638                    2 + ifmsh->mesh_id_len +
639                    2 + sizeof(struct ieee80211_meshconf_ie) +
640                    2 + sizeof(__le16) + /* awake window */
641                    ifmsh->ie_len;
642 
643         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
644         /* need an skb for IE builders to operate on */
645         skb = dev_alloc_skb(max(head_len, tail_len));
646 
647         if (!bcn || !skb)
648                 goto out_free;
649 
650         /*
651          * pointers go into the block we allocated,
652          * memory is | beacon_data | head | tail |
653          */
654         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
655 
656         /* fill in the head */
657         mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
658         memset(mgmt, 0, hdr_len);
659         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
660                                           IEEE80211_STYPE_BEACON);
661         eth_broadcast_addr(mgmt->da);
662         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
663         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
664         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
665         mgmt->u.beacon.beacon_int =
666                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
667         mgmt->u.beacon.capab_info |= cpu_to_le16(
668                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
669 
670         pos = skb_put(skb, 2);
671         *pos++ = WLAN_EID_SSID;
672         *pos++ = 0x0;
673 
674         rcu_read_lock();
675         csa = rcu_dereference(ifmsh->csa);
676         if (csa) {
677                 __le16 pre_value;
678 
679                 pos = skb_put(skb, 13);
680                 memset(pos, 0, 13);
681                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
682                 *pos++ = 3;
683                 *pos++ = 0x0;
684                 *pos++ = ieee80211_frequency_to_channel(
685                                 csa->settings.chandef.chan->center_freq);
686                 sdata->csa_counter_offset_beacon = hdr_len + 6;
687                 *pos++ = csa->settings.count;
688                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
689                 *pos++ = 6;
690                 if (ifmsh->chsw_init) {
691                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
692                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
693                 } else {
694                         *pos++ = ifmsh->chsw_ttl;
695                 }
696                 *pos++ |= csa->settings.block_tx ?
697                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
698                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
699                 pos += 2;
700                 pre_value = cpu_to_le16(ifmsh->pre_value);
701                 memcpy(pos, &pre_value, 2);
702                 pos += 2;
703         }
704         rcu_read_unlock();
705 
706         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
707             mesh_add_ds_params_ie(sdata, skb))
708                 goto out_free;
709 
710         bcn->head_len = skb->len;
711         memcpy(bcn->head, skb->data, bcn->head_len);
712 
713         /* now the tail */
714         skb_trim(skb, 0);
715         bcn->tail = bcn->head + bcn->head_len;
716 
717         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
718             mesh_add_rsn_ie(sdata, skb) ||
719             mesh_add_ht_cap_ie(sdata, skb) ||
720             mesh_add_ht_oper_ie(sdata, skb) ||
721             mesh_add_meshid_ie(sdata, skb) ||
722             mesh_add_meshconf_ie(sdata, skb) ||
723             mesh_add_awake_window_ie(sdata, skb) ||
724             mesh_add_vendor_ies(sdata, skb))
725                 goto out_free;
726 
727         bcn->tail_len = skb->len;
728         memcpy(bcn->tail, skb->data, bcn->tail_len);
729 
730         dev_kfree_skb(skb);
731         rcu_assign_pointer(ifmsh->beacon, bcn);
732         return 0;
733 out_free:
734         kfree(bcn);
735         dev_kfree_skb(skb);
736         return -ENOMEM;
737 }
738 
739 static int
740 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
741 {
742         struct beacon_data *old_bcn;
743         int ret;
744 
745         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
746                                             lockdep_is_held(&sdata->wdev.mtx));
747         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
748         if (ret)
749                 /* just reuse old beacon */
750                 return ret;
751 
752         if (old_bcn)
753                 kfree_rcu(old_bcn, rcu_head);
754         return 0;
755 }
756 
757 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
758                                        u32 changed)
759 {
760         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
761         unsigned long bits = changed;
762         u32 bit;
763 
764         if (!bits)
765                 return;
766 
767         /* if we race with running work, worst case this work becomes a noop */
768         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
769                 set_bit(bit, &ifmsh->mbss_changed);
770         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
771         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
772 }
773 
774 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
775 {
776         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
777         struct ieee80211_local *local = sdata->local;
778         u32 changed = BSS_CHANGED_BEACON |
779                       BSS_CHANGED_BEACON_ENABLED |
780                       BSS_CHANGED_HT |
781                       BSS_CHANGED_BASIC_RATES |
782                       BSS_CHANGED_BEACON_INT;
783 
784         local->fif_other_bss++;
785         /* mesh ifaces must set allmulti to forward mcast traffic */
786         atomic_inc(&local->iff_allmultis);
787         ieee80211_configure_filter(local);
788 
789         ifmsh->mesh_cc_id = 0;  /* Disabled */
790         /* register sync ops from extensible synchronization framework */
791         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
792         ifmsh->adjusting_tbtt = false;
793         ifmsh->sync_offset_clockdrift_max = 0;
794         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
795         ieee80211_mesh_root_setup(ifmsh);
796         ieee80211_queue_work(&local->hw, &sdata->work);
797         sdata->vif.bss_conf.ht_operation_mode =
798                                 ifmsh->mshcfg.ht_opmode;
799         sdata->vif.bss_conf.enable_beacon = true;
800 
801         changed |= ieee80211_mps_local_status_update(sdata);
802 
803         if (ieee80211_mesh_build_beacon(ifmsh)) {
804                 ieee80211_stop_mesh(sdata);
805                 return -ENOMEM;
806         }
807 
808         ieee80211_bss_info_change_notify(sdata, changed);
809 
810         netif_carrier_on(sdata->dev);
811         return 0;
812 }
813 
814 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
815 {
816         struct ieee80211_local *local = sdata->local;
817         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
818         struct beacon_data *bcn;
819 
820         netif_carrier_off(sdata->dev);
821 
822         /* stop the beacon */
823         ifmsh->mesh_id_len = 0;
824         sdata->vif.bss_conf.enable_beacon = false;
825         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
826         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
827         bcn = rcu_dereference_protected(ifmsh->beacon,
828                                         lockdep_is_held(&sdata->wdev.mtx));
829         rcu_assign_pointer(ifmsh->beacon, NULL);
830         kfree_rcu(bcn, rcu_head);
831 
832         /* flush STAs and mpaths on this iface */
833         sta_info_flush(sdata);
834         mesh_path_flush_by_iface(sdata);
835 
836         /* free all potentially still buffered group-addressed frames */
837         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
838         skb_queue_purge(&ifmsh->ps.bc_buf);
839 
840         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
841         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
842         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
843 
844         /* clear any mesh work (for next join) we may have accrued */
845         ifmsh->wrkq_flags = 0;
846         ifmsh->mbss_changed = 0;
847 
848         local->fif_other_bss--;
849         atomic_dec(&local->iff_allmultis);
850         ieee80211_configure_filter(local);
851 }
852 
853 static bool
854 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
855                                  struct ieee802_11_elems *elems, bool beacon)
856 {
857         struct cfg80211_csa_settings params;
858         struct ieee80211_csa_ie csa_ie;
859         struct ieee80211_chanctx_conf *chanctx_conf;
860         struct ieee80211_chanctx *chanctx;
861         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
862         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
863         int err, num_chanctx;
864         u32 sta_flags;
865 
866         if (sdata->vif.csa_active)
867                 return true;
868 
869         if (!ifmsh->mesh_id)
870                 return false;
871 
872         sta_flags = IEEE80211_STA_DISABLE_VHT;
873         switch (sdata->vif.bss_conf.chandef.width) {
874         case NL80211_CHAN_WIDTH_20_NOHT:
875                 sta_flags |= IEEE80211_STA_DISABLE_HT;
876         case NL80211_CHAN_WIDTH_20:
877                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
878                 break;
879         default:
880                 break;
881         }
882 
883         memset(&params, 0, sizeof(params));
884         memset(&csa_ie, 0, sizeof(csa_ie));
885         err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, band,
886                                            sta_flags, sdata->vif.addr,
887                                            &csa_ie);
888         if (err < 0)
889                 return false;
890         if (err)
891                 return false;
892 
893         params.chandef = csa_ie.chandef;
894         params.count = csa_ie.count;
895 
896         if (sdata->vif.bss_conf.chandef.chan->band !=
897             params.chandef.chan->band)
898                 return false;
899 
900         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
901                                      IEEE80211_CHAN_DISABLED)) {
902                 sdata_info(sdata,
903                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
904                            sdata->vif.addr,
905                            params.chandef.chan->center_freq,
906                            params.chandef.width,
907                            params.chandef.center_freq1,
908                            params.chandef.center_freq2);
909                 return false;
910         }
911 
912         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
913                                             &params.chandef);
914         if (err < 0)
915                 return false;
916         if (err) {
917                 params.radar_required = true;
918                 /* TODO: DFS not (yet) supported */
919                 return false;
920         }
921 
922         rcu_read_lock();
923         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
924         if (!chanctx_conf)
925                 goto failed_chswitch;
926 
927         /* don't handle for multi-VIF cases */
928         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
929         if (chanctx->refcount > 1)
930                 goto failed_chswitch;
931 
932         num_chanctx = 0;
933         list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
934                 num_chanctx++;
935 
936         if (num_chanctx > 1)
937                 goto failed_chswitch;
938 
939         rcu_read_unlock();
940 
941         mcsa_dbg(sdata,
942                  "received channel switch announcement to go to channel %d MHz\n",
943                  params.chandef.chan->center_freq);
944 
945         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
946         if (beacon) {
947                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
948                 if (ifmsh->pre_value >= csa_ie.pre_value)
949                         return false;
950                 ifmsh->pre_value = csa_ie.pre_value;
951         }
952 
953         if (ifmsh->chsw_ttl < ifmsh->mshcfg.dot11MeshTTL) {
954                 if (ieee80211_mesh_csa_beacon(sdata, &params, false) < 0)
955                         return false;
956         } else {
957                 return false;
958         }
959 
960         sdata->csa_radar_required = params.radar_required;
961 
962         if (params.block_tx)
963                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
964                                 IEEE80211_MAX_QUEUE_MAP,
965                                 IEEE80211_QUEUE_STOP_REASON_CSA);
966 
967         sdata->local->csa_chandef = params.chandef;
968         sdata->vif.csa_active = true;
969 
970         ieee80211_bss_info_change_notify(sdata, err);
971         drv_channel_switch_beacon(sdata, &params.chandef);
972 
973         return true;
974 failed_chswitch:
975         rcu_read_unlock();
976         return false;
977 }
978 
979 static void
980 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
981                             struct ieee80211_mgmt *mgmt, size_t len)
982 {
983         struct ieee80211_local *local = sdata->local;
984         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
985         struct sk_buff *presp;
986         struct beacon_data *bcn;
987         struct ieee80211_mgmt *hdr;
988         struct ieee802_11_elems elems;
989         size_t baselen;
990         u8 *pos;
991 
992         pos = mgmt->u.probe_req.variable;
993         baselen = (u8 *) pos - (u8 *) mgmt;
994         if (baselen > len)
995                 return;
996 
997         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
998 
999         if (!elems.mesh_id)
1000                 return;
1001 
1002         /* 802.11-2012 10.1.4.3.2 */
1003         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1004              !is_broadcast_ether_addr(mgmt->da)) ||
1005             elems.ssid_len != 0)
1006                 return;
1007 
1008         if (elems.mesh_id_len != 0 &&
1009             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1010              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1011                 return;
1012 
1013         rcu_read_lock();
1014         bcn = rcu_dereference(ifmsh->beacon);
1015 
1016         if (!bcn)
1017                 goto out;
1018 
1019         presp = dev_alloc_skb(local->tx_headroom +
1020                               bcn->head_len + bcn->tail_len);
1021         if (!presp)
1022                 goto out;
1023 
1024         skb_reserve(presp, local->tx_headroom);
1025         memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1026         memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1027         hdr = (struct ieee80211_mgmt *) presp->data;
1028         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1029                                          IEEE80211_STYPE_PROBE_RESP);
1030         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1031         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1032         ieee80211_tx_skb(sdata, presp);
1033 out:
1034         rcu_read_unlock();
1035 }
1036 
1037 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1038                                         u16 stype,
1039                                         struct ieee80211_mgmt *mgmt,
1040                                         size_t len,
1041                                         struct ieee80211_rx_status *rx_status)
1042 {
1043         struct ieee80211_local *local = sdata->local;
1044         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1045         struct ieee802_11_elems elems;
1046         struct ieee80211_channel *channel;
1047         size_t baselen;
1048         int freq;
1049         enum ieee80211_band band = rx_status->band;
1050 
1051         /* ignore ProbeResp to foreign address */
1052         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1053             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1054                 return;
1055 
1056         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1057         if (baselen > len)
1058                 return;
1059 
1060         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1061                                false, &elems);
1062 
1063         /* ignore non-mesh or secure / unsecure mismatch */
1064         if ((!elems.mesh_id || !elems.mesh_config) ||
1065             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1066             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1067                 return;
1068 
1069         if (elems.ds_params)
1070                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1071         else
1072                 freq = rx_status->freq;
1073 
1074         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1075 
1076         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1077                 return;
1078 
1079         if (mesh_matches_local(sdata, &elems))
1080                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1081 
1082         if (ifmsh->sync_ops)
1083                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1084                         stype, mgmt, &elems, rx_status);
1085 
1086         if (!ifmsh->chsw_init)
1087                 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1088 }
1089 
1090 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1091 {
1092         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1093         struct mesh_csa_settings *tmp_csa_settings;
1094         int ret = 0;
1095 
1096         /* Reset the TTL value and Initiator flag */
1097         ifmsh->chsw_init = false;
1098         ifmsh->chsw_ttl = 0;
1099 
1100         /* Remove the CSA and MCSP elements from the beacon */
1101         tmp_csa_settings = rcu_dereference(ifmsh->csa);
1102         rcu_assign_pointer(ifmsh->csa, NULL);
1103         kfree_rcu(tmp_csa_settings, rcu_head);
1104         ret = ieee80211_mesh_rebuild_beacon(sdata);
1105         if (ret)
1106                 return -EINVAL;
1107 
1108         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
1109 
1110         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1111                  sdata->vif.bss_conf.chandef.chan->center_freq);
1112         return 0;
1113 }
1114 
1115 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1116                               struct cfg80211_csa_settings *csa_settings,
1117                               bool csa_action)
1118 {
1119         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1120         struct mesh_csa_settings *tmp_csa_settings;
1121         int ret = 0;
1122 
1123         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1124                                    GFP_ATOMIC);
1125         if (!tmp_csa_settings)
1126                 return -ENOMEM;
1127 
1128         memcpy(&tmp_csa_settings->settings, csa_settings,
1129                sizeof(struct cfg80211_csa_settings));
1130 
1131         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1132 
1133         ret = ieee80211_mesh_rebuild_beacon(sdata);
1134         if (ret) {
1135                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1136                 rcu_assign_pointer(ifmsh->csa, NULL);
1137                 kfree_rcu(tmp_csa_settings, rcu_head);
1138                 return ret;
1139         }
1140 
1141         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
1142 
1143         if (csa_action)
1144                 ieee80211_send_action_csa(sdata, csa_settings);
1145 
1146         return 0;
1147 }
1148 
1149 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1150                                struct ieee80211_mgmt *mgmt, size_t len)
1151 {
1152         struct ieee80211_mgmt *mgmt_fwd;
1153         struct sk_buff *skb;
1154         struct ieee80211_local *local = sdata->local;
1155         u8 *pos = mgmt->u.action.u.chan_switch.variable;
1156         size_t offset_ttl;
1157 
1158         skb = dev_alloc_skb(local->tx_headroom + len);
1159         if (!skb)
1160                 return -ENOMEM;
1161         skb_reserve(skb, local->tx_headroom);
1162         mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1163 
1164         /* offset_ttl is based on whether the secondary channel
1165          * offset is available or not. Substract 1 from the mesh TTL
1166          * and disable the initiator flag before forwarding.
1167          */
1168         offset_ttl = (len < 42) ? 7 : 10;
1169         *(pos + offset_ttl) -= 1;
1170         *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1171 
1172         memcpy(mgmt_fwd, mgmt, len);
1173         eth_broadcast_addr(mgmt_fwd->da);
1174         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1175         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1176 
1177         ieee80211_tx_skb(sdata, skb);
1178         return 0;
1179 }
1180 
1181 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1182                               struct ieee80211_mgmt *mgmt, size_t len)
1183 {
1184         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1185         struct ieee802_11_elems elems;
1186         u16 pre_value;
1187         bool fwd_csa = true;
1188         size_t baselen;
1189         u8 *pos;
1190 
1191         if (mgmt->u.action.u.measurement.action_code !=
1192             WLAN_ACTION_SPCT_CHL_SWITCH)
1193                 return;
1194 
1195         pos = mgmt->u.action.u.chan_switch.variable;
1196         baselen = offsetof(struct ieee80211_mgmt,
1197                            u.action.u.chan_switch.variable);
1198         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1199 
1200         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1201         if (!--ifmsh->chsw_ttl)
1202                 fwd_csa = false;
1203 
1204         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1205         if (ifmsh->pre_value >= pre_value)
1206                 return;
1207 
1208         ifmsh->pre_value = pre_value;
1209 
1210         if (!ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1211                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1212                 return;
1213         }
1214 
1215         /* forward or re-broadcast the CSA frame */
1216         if (fwd_csa) {
1217                 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1218                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1219         }
1220 }
1221 
1222 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1223                                           struct ieee80211_mgmt *mgmt,
1224                                           size_t len,
1225                                           struct ieee80211_rx_status *rx_status)
1226 {
1227         switch (mgmt->u.action.category) {
1228         case WLAN_CATEGORY_SELF_PROTECTED:
1229                 switch (mgmt->u.action.u.self_prot.action_code) {
1230                 case WLAN_SP_MESH_PEERING_OPEN:
1231                 case WLAN_SP_MESH_PEERING_CLOSE:
1232                 case WLAN_SP_MESH_PEERING_CONFIRM:
1233                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1234                         break;
1235                 }
1236                 break;
1237         case WLAN_CATEGORY_MESH_ACTION:
1238                 if (mesh_action_is_path_sel(mgmt))
1239                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1240                 break;
1241         case WLAN_CATEGORY_SPECTRUM_MGMT:
1242                 mesh_rx_csa_frame(sdata, mgmt, len);
1243                 break;
1244         }
1245 }
1246 
1247 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1248                                    struct sk_buff *skb)
1249 {
1250         struct ieee80211_rx_status *rx_status;
1251         struct ieee80211_mgmt *mgmt;
1252         u16 stype;
1253 
1254         sdata_lock(sdata);
1255 
1256         /* mesh already went down */
1257         if (!sdata->wdev.mesh_id_len)
1258                 goto out;
1259 
1260         rx_status = IEEE80211_SKB_RXCB(skb);
1261         mgmt = (struct ieee80211_mgmt *) skb->data;
1262         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1263 
1264         switch (stype) {
1265         case IEEE80211_STYPE_PROBE_RESP:
1266         case IEEE80211_STYPE_BEACON:
1267                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1268                                             rx_status);
1269                 break;
1270         case IEEE80211_STYPE_PROBE_REQ:
1271                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1272                 break;
1273         case IEEE80211_STYPE_ACTION:
1274                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1275                 break;
1276         }
1277 out:
1278         sdata_unlock(sdata);
1279 }
1280 
1281 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1282 {
1283         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1284         u32 bit, changed = 0;
1285 
1286         for_each_set_bit(bit, &ifmsh->mbss_changed,
1287                          sizeof(changed) * BITS_PER_BYTE) {
1288                 clear_bit(bit, &ifmsh->mbss_changed);
1289                 changed |= BIT(bit);
1290         }
1291 
1292         if (sdata->vif.bss_conf.enable_beacon &&
1293             (changed & (BSS_CHANGED_BEACON |
1294                         BSS_CHANGED_HT |
1295                         BSS_CHANGED_BASIC_RATES |
1296                         BSS_CHANGED_BEACON_INT)))
1297                 if (ieee80211_mesh_rebuild_beacon(sdata))
1298                         return;
1299 
1300         ieee80211_bss_info_change_notify(sdata, changed);
1301 }
1302 
1303 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1304 {
1305         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1306 
1307         sdata_lock(sdata);
1308 
1309         /* mesh already went down */
1310         if (!sdata->wdev.mesh_id_len)
1311                 goto out;
1312 
1313         if (ifmsh->preq_queue_len &&
1314             time_after(jiffies,
1315                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1316                 mesh_path_start_discovery(sdata);
1317 
1318         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
1319                 mesh_mpath_table_grow();
1320 
1321         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
1322                 mesh_mpp_table_grow();
1323 
1324         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1325                 ieee80211_mesh_housekeeping(sdata);
1326 
1327         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1328                 ieee80211_mesh_rootpath(sdata);
1329 
1330         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1331                 mesh_sync_adjust_tbtt(sdata);
1332 
1333         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1334                 mesh_bss_info_changed(sdata);
1335 out:
1336         sdata_unlock(sdata);
1337 }
1338 
1339 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
1340 {
1341         struct ieee80211_sub_if_data *sdata;
1342 
1343         rcu_read_lock();
1344         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1345                 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1346                     ieee80211_sdata_running(sdata))
1347                         ieee80211_queue_work(&local->hw, &sdata->work);
1348         rcu_read_unlock();
1349 }
1350 
1351 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1352 {
1353         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1354         static u8 zero_addr[ETH_ALEN] = {};
1355 
1356         setup_timer(&ifmsh->housekeeping_timer,
1357                     ieee80211_mesh_housekeeping_timer,
1358                     (unsigned long) sdata);
1359 
1360         ifmsh->accepting_plinks = true;
1361         atomic_set(&ifmsh->mpaths, 0);
1362         mesh_rmc_init(sdata);
1363         ifmsh->last_preq = jiffies;
1364         ifmsh->next_perr = jiffies;
1365         ifmsh->chsw_init = false;
1366         /* Allocate all mesh structures when creating the first mesh interface. */
1367         if (!mesh_allocated)
1368                 ieee80211s_init();
1369         setup_timer(&ifmsh->mesh_path_timer,
1370                     ieee80211_mesh_path_timer,
1371                     (unsigned long) sdata);
1372         setup_timer(&ifmsh->mesh_path_root_timer,
1373                     ieee80211_mesh_path_root_timer,
1374                     (unsigned long) sdata);
1375         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1376         skb_queue_head_init(&ifmsh->ps.bc_buf);
1377         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1378         spin_lock_init(&ifmsh->sync_offset_lock);
1379         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1380 
1381         sdata->vif.bss_conf.bssid = zero_addr;
1382 }
1383 

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