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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
17static int mesh_allocated;
18static struct kmem_cache *rm_cache;
19
20bool 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
26void ieee80211s_init(void)
27{
28 mesh_allocated = 1;
29 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
30 0, 0, NULL);
31}
32
33void ieee80211s_stop(void)
34{
35 if (!mesh_allocated)
36 return;
37 kmem_cache_destroy(rm_cache);
38}
39
40static void ieee80211_mesh_housekeeping_timer(unsigned long data)
41{
42 struct ieee80211_sub_if_data *sdata = (void *) data;
43 struct ieee80211_local *local = sdata->local;
44 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
45
46 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
47
48 ieee80211_queue_work(&local->hw, &sdata->work);
49}
50
51/**
52 * mesh_matches_local - check if the config of a mesh point matches ours
53 *
54 * @sdata: local mesh subif
55 * @ie: information elements of a management frame from the mesh peer
56 *
57 * This function checks if the mesh configuration of a mesh point matches the
58 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
59 */
60bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
61 struct ieee802_11_elems *ie)
62{
63 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
64 u32 basic_rates = 0;
65 struct cfg80211_chan_def sta_chan_def;
66
67 /*
68 * As support for each feature is added, check for matching
69 * - On mesh config capabilities
70 * - Power Save Support En
71 * - Sync support enabled
72 * - Sync support active
73 * - Sync support required from peer
74 * - MDA enabled
75 * - Power management control on fc
76 */
77 if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
78 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
79 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
80 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
81 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
82 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
83 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
84 return false;
85
86 ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata),
87 &basic_rates);
88
89 if (sdata->vif.bss_conf.basic_rates != basic_rates)
90 return false;
91
92 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
93 NL80211_CHAN_NO_HT);
94 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
95 ieee80211_chandef_vht_oper(ie->vht_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 */
109bool 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 */
122u32 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 */
148void mesh_sta_cleanup(struct sta_info *sta)
149{
150 struct ieee80211_sub_if_data *sdata = sta->sdata;
151 u32 changed = mesh_plink_deactivate(sta);
152
153 if (changed)
154 ieee80211_mbss_info_change_notify(sdata, changed);
155}
156
157int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
158{
159 int i;
160
161 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
162 if (!sdata->u.mesh.rmc)
163 return -ENOMEM;
164 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
165 for (i = 0; i < RMC_BUCKETS; i++)
166 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
167 return 0;
168}
169
170void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
171{
172 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
173 struct rmc_entry *p;
174 struct hlist_node *n;
175 int i;
176
177 if (!sdata->u.mesh.rmc)
178 return;
179
180 for (i = 0; i < RMC_BUCKETS; i++) {
181 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
182 hlist_del(&p->list);
183 kmem_cache_free(rm_cache, p);
184 }
185 }
186
187 kfree(rmc);
188 sdata->u.mesh.rmc = NULL;
189}
190
191/**
192 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
193 *
194 * @sdata: interface
195 * @sa: source address
196 * @mesh_hdr: mesh_header
197 *
198 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
199 *
200 * Checks using the source address and the mesh sequence number if we have
201 * received this frame lately. If the frame is not in the cache, it is added to
202 * it.
203 */
204int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
205 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
206{
207 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
208 u32 seqnum = 0;
209 int entries = 0;
210 u8 idx;
211 struct rmc_entry *p;
212 struct hlist_node *n;
213
214 if (!rmc)
215 return -1;
216
217 /* Don't care about endianness since only match matters */
218 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
219 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
220 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
221 ++entries;
222 if (time_after(jiffies, p->exp_time) ||
223 entries == RMC_QUEUE_MAX_LEN) {
224 hlist_del(&p->list);
225 kmem_cache_free(rm_cache, p);
226 --entries;
227 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
228 return -1;
229 }
230
231 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
232 if (!p)
233 return 0;
234
235 p->seqnum = seqnum;
236 p->exp_time = jiffies + RMC_TIMEOUT;
237 memcpy(p->sa, sa, ETH_ALEN);
238 hlist_add_head(&p->list, &rmc->bucket[idx]);
239 return 0;
240}
241
242int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
243 struct sk_buff *skb)
244{
245 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
246 u8 *pos, neighbors;
247 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
248
249 if (skb_tailroom(skb) < 2 + meshconf_len)
250 return -ENOMEM;
251
252 pos = skb_put(skb, 2 + meshconf_len);
253 *pos++ = WLAN_EID_MESH_CONFIG;
254 *pos++ = meshconf_len;
255
256 /* save a pointer for quick updates in pre-tbtt */
257 ifmsh->meshconf_offset = pos - skb->data;
258
259 /* Active path selection protocol ID */
260 *pos++ = ifmsh->mesh_pp_id;
261 /* Active path selection metric ID */
262 *pos++ = ifmsh->mesh_pm_id;
263 /* Congestion control mode identifier */
264 *pos++ = ifmsh->mesh_cc_id;
265 /* Synchronization protocol identifier */
266 *pos++ = ifmsh->mesh_sp_id;
267 /* Authentication Protocol identifier */
268 *pos++ = ifmsh->mesh_auth_id;
269 /* Mesh Formation Info - number of neighbors */
270 neighbors = atomic_read(&ifmsh->estab_plinks);
271 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
272 *pos++ = neighbors << 1;
273 /* Mesh capability */
274 *pos = 0x00;
275 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
276 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
277 *pos |= ifmsh->accepting_plinks ?
278 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
279 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
280 *pos |= ifmsh->ps_peers_deep_sleep ?
281 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
282 *pos++ |= ifmsh->adjusting_tbtt ?
283 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
284 *pos++ = 0x00;
285
286 return 0;
287}
288
289int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
290{
291 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
292 u8 *pos;
293
294 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
295 return -ENOMEM;
296
297 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
298 *pos++ = WLAN_EID_MESH_ID;
299 *pos++ = ifmsh->mesh_id_len;
300 if (ifmsh->mesh_id_len)
301 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
302
303 return 0;
304}
305
306static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
307 struct sk_buff *skb)
308{
309 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
310 u8 *pos;
311
312 /* see IEEE802.11-2012 13.14.6 */
313 if (ifmsh->ps_peers_light_sleep == 0 &&
314 ifmsh->ps_peers_deep_sleep == 0 &&
315 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
316 return 0;
317
318 if (skb_tailroom(skb) < 4)
319 return -ENOMEM;
320
321 pos = skb_put(skb, 2 + 2);
322 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
323 *pos++ = 2;
324 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
325
326 return 0;
327}
328
329int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
330 struct sk_buff *skb)
331{
332 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
333 u8 offset, len;
334 const u8 *data;
335
336 if (!ifmsh->ie || !ifmsh->ie_len)
337 return 0;
338
339 /* fast-forward to vendor IEs */
340 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
341
342 if (offset < ifmsh->ie_len) {
343 len = ifmsh->ie_len - offset;
344 data = ifmsh->ie + offset;
345 if (skb_tailroom(skb) < len)
346 return -ENOMEM;
347 memcpy(skb_put(skb, len), data, len);
348 }
349
350 return 0;
351}
352
353int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
354{
355 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
356 u8 len = 0;
357 const u8 *data;
358
359 if (!ifmsh->ie || !ifmsh->ie_len)
360 return 0;
361
362 /* find RSN IE */
363 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
364 if (!data)
365 return 0;
366
367 len = data[1] + 2;
368
369 if (skb_tailroom(skb) < len)
370 return -ENOMEM;
371 memcpy(skb_put(skb, len), data, len);
372
373 return 0;
374}
375
376static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
377 struct sk_buff *skb)
378{
379 struct ieee80211_chanctx_conf *chanctx_conf;
380 struct ieee80211_channel *chan;
381 u8 *pos;
382
383 if (skb_tailroom(skb) < 3)
384 return -ENOMEM;
385
386 rcu_read_lock();
387 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
388 if (WARN_ON(!chanctx_conf)) {
389 rcu_read_unlock();
390 return -EINVAL;
391 }
392 chan = chanctx_conf->def.chan;
393 rcu_read_unlock();
394
395 pos = skb_put(skb, 2 + 1);
396 *pos++ = WLAN_EID_DS_PARAMS;
397 *pos++ = 1;
398 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
399
400 return 0;
401}
402
403int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
404 struct sk_buff *skb)
405{
406 struct ieee80211_local *local = sdata->local;
407 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
408 struct ieee80211_supported_band *sband;
409 u8 *pos;
410
411 sband = local->hw.wiphy->bands[band];
412 if (!sband->ht_cap.ht_supported ||
413 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
414 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
415 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
416 return 0;
417
418 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
419 return -ENOMEM;
420
421 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
422 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
423
424 return 0;
425}
426
427int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
428 struct sk_buff *skb)
429{
430 struct ieee80211_local *local = sdata->local;
431 struct ieee80211_chanctx_conf *chanctx_conf;
432 struct ieee80211_channel *channel;
433 struct ieee80211_supported_band *sband;
434 struct ieee80211_sta_ht_cap *ht_cap;
435 u8 *pos;
436
437 rcu_read_lock();
438 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
439 if (WARN_ON(!chanctx_conf)) {
440 rcu_read_unlock();
441 return -EINVAL;
442 }
443 channel = chanctx_conf->def.chan;
444 rcu_read_unlock();
445
446 sband = local->hw.wiphy->bands[channel->band];
447 ht_cap = &sband->ht_cap;
448
449 if (!ht_cap->ht_supported ||
450 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
451 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
452 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
453 return 0;
454
455 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
456 return -ENOMEM;
457
458 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
459 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
460 sdata->vif.bss_conf.ht_operation_mode,
461 false);
462
463 return 0;
464}
465
466int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
467 struct sk_buff *skb)
468{
469 struct ieee80211_local *local = sdata->local;
470 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
471 struct ieee80211_supported_band *sband;
472 u8 *pos;
473
474 sband = local->hw.wiphy->bands[band];
475 if (!sband->vht_cap.vht_supported ||
476 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
477 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
478 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
479 return 0;
480
481 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
482 return -ENOMEM;
483
484 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
485 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
486
487 return 0;
488}
489
490int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
491 struct sk_buff *skb)
492{
493 struct ieee80211_local *local = sdata->local;
494 struct ieee80211_chanctx_conf *chanctx_conf;
495 struct ieee80211_channel *channel;
496 struct ieee80211_supported_band *sband;
497 struct ieee80211_sta_vht_cap *vht_cap;
498 u8 *pos;
499
500 rcu_read_lock();
501 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
502 if (WARN_ON(!chanctx_conf)) {
503 rcu_read_unlock();
504 return -EINVAL;
505 }
506 channel = chanctx_conf->def.chan;
507 rcu_read_unlock();
508
509 sband = local->hw.wiphy->bands[channel->band];
510 vht_cap = &sband->vht_cap;
511
512 if (!vht_cap->vht_supported ||
513 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
514 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
515 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
516 return 0;
517
518 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
519 return -ENOMEM;
520
521 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
522 ieee80211_ie_build_vht_oper(pos, vht_cap,
523 &sdata->vif.bss_conf.chandef);
524
525 return 0;
526}
527
528static void ieee80211_mesh_path_timer(unsigned long data)
529{
530 struct ieee80211_sub_if_data *sdata =
531 (struct ieee80211_sub_if_data *) data;
532
533 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
534}
535
536static void ieee80211_mesh_path_root_timer(unsigned long data)
537{
538 struct ieee80211_sub_if_data *sdata =
539 (struct ieee80211_sub_if_data *) data;
540 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
541
542 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
543
544 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
545}
546
547void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
548{
549 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
550 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
551 else {
552 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
553 /* stop running timer */
554 del_timer_sync(&ifmsh->mesh_path_root_timer);
555 }
556}
557
558/**
559 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
560 * @hdr: 802.11 frame header
561 * @fc: frame control field
562 * @meshda: destination address in the mesh
563 * @meshsa: source address address in the mesh. Same as TA, as frame is
564 * locally originated.
565 *
566 * Return the length of the 802.11 (does not include a mesh control header)
567 */
568int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
569 const u8 *meshda, const u8 *meshsa)
570{
571 if (is_multicast_ether_addr(meshda)) {
572 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
573 /* DA TA SA */
574 memcpy(hdr->addr1, meshda, ETH_ALEN);
575 memcpy(hdr->addr2, meshsa, ETH_ALEN);
576 memcpy(hdr->addr3, meshsa, ETH_ALEN);
577 return 24;
578 } else {
579 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
580 /* RA TA DA SA */
581 eth_zero_addr(hdr->addr1); /* RA is resolved later */
582 memcpy(hdr->addr2, meshsa, ETH_ALEN);
583 memcpy(hdr->addr3, meshda, ETH_ALEN);
584 memcpy(hdr->addr4, meshsa, ETH_ALEN);
585 return 30;
586 }
587}
588
589/**
590 * ieee80211_new_mesh_header - create a new mesh header
591 * @sdata: mesh interface to be used
592 * @meshhdr: uninitialized mesh header
593 * @addr4or5: 1st address in the ae header, which may correspond to address 4
594 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
595 * be NULL.
596 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
597 * mesh frame
598 *
599 * Return the header length.
600 */
601unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
602 struct ieee80211s_hdr *meshhdr,
603 const char *addr4or5, const char *addr6)
604{
605 if (WARN_ON(!addr4or5 && addr6))
606 return 0;
607
608 memset(meshhdr, 0, sizeof(*meshhdr));
609
610 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
611
612 /* FIXME: racy -- TX on multiple queues can be concurrent */
613 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
614 sdata->u.mesh.mesh_seqnum++;
615
616 if (addr4or5 && !addr6) {
617 meshhdr->flags |= MESH_FLAGS_AE_A4;
618 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
619 return 2 * ETH_ALEN;
620 } else if (addr4or5 && addr6) {
621 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
622 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
623 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
624 return 3 * ETH_ALEN;
625 }
626
627 return ETH_ALEN;
628}
629
630static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
631{
632 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
633 u32 changed;
634
635 if (ifmsh->mshcfg.plink_timeout > 0)
636 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
637 mesh_path_expire(sdata);
638
639 changed = mesh_accept_plinks_update(sdata);
640 ieee80211_mbss_info_change_notify(sdata, changed);
641
642 mod_timer(&ifmsh->housekeeping_timer,
643 round_jiffies(jiffies +
644 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
645}
646
647static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
648{
649 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
650 u32 interval;
651
652 mesh_path_tx_root_frame(sdata);
653
654 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
655 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
656 else
657 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
658
659 mod_timer(&ifmsh->mesh_path_root_timer,
660 round_jiffies(TU_TO_EXP_TIME(interval)));
661}
662
663static int
664ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
665{
666 struct beacon_data *bcn;
667 int head_len, tail_len;
668 struct sk_buff *skb;
669 struct ieee80211_mgmt *mgmt;
670 struct ieee80211_chanctx_conf *chanctx_conf;
671 struct mesh_csa_settings *csa;
672 enum nl80211_band band;
673 u8 *pos;
674 struct ieee80211_sub_if_data *sdata;
675 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
676 sizeof(mgmt->u.beacon);
677
678 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
679 rcu_read_lock();
680 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
681 band = chanctx_conf->def.chan->band;
682 rcu_read_unlock();
683
684 head_len = hdr_len +
685 2 + /* NULL SSID */
686 /* Channel Switch Announcement */
687 2 + sizeof(struct ieee80211_channel_sw_ie) +
688 /* Mesh Channel Swith Parameters */
689 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
690 2 + 8 + /* supported rates */
691 2 + 3; /* DS params */
692 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
693 2 + sizeof(struct ieee80211_ht_cap) +
694 2 + sizeof(struct ieee80211_ht_operation) +
695 2 + ifmsh->mesh_id_len +
696 2 + sizeof(struct ieee80211_meshconf_ie) +
697 2 + sizeof(__le16) + /* awake window */
698 2 + sizeof(struct ieee80211_vht_cap) +
699 2 + sizeof(struct ieee80211_vht_operation) +
700 ifmsh->ie_len;
701
702 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
703 /* need an skb for IE builders to operate on */
704 skb = dev_alloc_skb(max(head_len, tail_len));
705
706 if (!bcn || !skb)
707 goto out_free;
708
709 /*
710 * pointers go into the block we allocated,
711 * memory is | beacon_data | head | tail |
712 */
713 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
714
715 /* fill in the head */
716 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
717 memset(mgmt, 0, hdr_len);
718 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
719 IEEE80211_STYPE_BEACON);
720 eth_broadcast_addr(mgmt->da);
721 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
722 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
723 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
724 mgmt->u.beacon.beacon_int =
725 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
726 mgmt->u.beacon.capab_info |= cpu_to_le16(
727 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
728
729 pos = skb_put(skb, 2);
730 *pos++ = WLAN_EID_SSID;
731 *pos++ = 0x0;
732
733 rcu_read_lock();
734 csa = rcu_dereference(ifmsh->csa);
735 if (csa) {
736 pos = skb_put(skb, 13);
737 memset(pos, 0, 13);
738 *pos++ = WLAN_EID_CHANNEL_SWITCH;
739 *pos++ = 3;
740 *pos++ = 0x0;
741 *pos++ = ieee80211_frequency_to_channel(
742 csa->settings.chandef.chan->center_freq);
743 bcn->csa_current_counter = csa->settings.count;
744 bcn->csa_counter_offsets[0] = hdr_len + 6;
745 *pos++ = csa->settings.count;
746 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
747 *pos++ = 6;
748 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
749 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
750 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
751 } else {
752 *pos++ = ifmsh->chsw_ttl;
753 }
754 *pos++ |= csa->settings.block_tx ?
755 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
756 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
757 pos += 2;
758 put_unaligned_le16(ifmsh->pre_value, pos);
759 pos += 2;
760 }
761 rcu_read_unlock();
762
763 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
764 mesh_add_ds_params_ie(sdata, skb))
765 goto out_free;
766
767 bcn->head_len = skb->len;
768 memcpy(bcn->head, skb->data, bcn->head_len);
769
770 /* now the tail */
771 skb_trim(skb, 0);
772 bcn->tail = bcn->head + bcn->head_len;
773
774 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
775 mesh_add_rsn_ie(sdata, skb) ||
776 mesh_add_ht_cap_ie(sdata, skb) ||
777 mesh_add_ht_oper_ie(sdata, skb) ||
778 mesh_add_meshid_ie(sdata, skb) ||
779 mesh_add_meshconf_ie(sdata, skb) ||
780 mesh_add_awake_window_ie(sdata, skb) ||
781 mesh_add_vht_cap_ie(sdata, skb) ||
782 mesh_add_vht_oper_ie(sdata, skb) ||
783 mesh_add_vendor_ies(sdata, skb))
784 goto out_free;
785
786 bcn->tail_len = skb->len;
787 memcpy(bcn->tail, skb->data, bcn->tail_len);
788 bcn->meshconf = (struct ieee80211_meshconf_ie *)
789 (bcn->tail + ifmsh->meshconf_offset);
790
791 dev_kfree_skb(skb);
792 rcu_assign_pointer(ifmsh->beacon, bcn);
793 return 0;
794out_free:
795 kfree(bcn);
796 dev_kfree_skb(skb);
797 return -ENOMEM;
798}
799
800static int
801ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
802{
803 struct beacon_data *old_bcn;
804 int ret;
805
806 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
807 lockdep_is_held(&sdata->wdev.mtx));
808 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
809 if (ret)
810 /* just reuse old beacon */
811 return ret;
812
813 if (old_bcn)
814 kfree_rcu(old_bcn, rcu_head);
815 return 0;
816}
817
818void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
819 u32 changed)
820{
821 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
822 unsigned long bits = changed;
823 u32 bit;
824
825 if (!bits)
826 return;
827
828 /* if we race with running work, worst case this work becomes a noop */
829 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
830 set_bit(bit, &ifmsh->mbss_changed);
831 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
832 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
833}
834
835int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
836{
837 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
838 struct ieee80211_local *local = sdata->local;
839 u32 changed = BSS_CHANGED_BEACON |
840 BSS_CHANGED_BEACON_ENABLED |
841 BSS_CHANGED_HT |
842 BSS_CHANGED_BASIC_RATES |
843 BSS_CHANGED_BEACON_INT;
844
845 local->fif_other_bss++;
846 /* mesh ifaces must set allmulti to forward mcast traffic */
847 atomic_inc(&local->iff_allmultis);
848 ieee80211_configure_filter(local);
849
850 ifmsh->mesh_cc_id = 0; /* Disabled */
851 /* register sync ops from extensible synchronization framework */
852 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
853 ifmsh->adjusting_tbtt = false;
854 ifmsh->sync_offset_clockdrift_max = 0;
855 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
856 ieee80211_mesh_root_setup(ifmsh);
857 ieee80211_queue_work(&local->hw, &sdata->work);
858 sdata->vif.bss_conf.ht_operation_mode =
859 ifmsh->mshcfg.ht_opmode;
860 sdata->vif.bss_conf.enable_beacon = true;
861
862 changed |= ieee80211_mps_local_status_update(sdata);
863
864 if (ieee80211_mesh_build_beacon(ifmsh)) {
865 ieee80211_stop_mesh(sdata);
866 return -ENOMEM;
867 }
868
869 ieee80211_recalc_dtim(local, sdata);
870 ieee80211_bss_info_change_notify(sdata, changed);
871
872 netif_carrier_on(sdata->dev);
873 return 0;
874}
875
876void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
877{
878 struct ieee80211_local *local = sdata->local;
879 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
880 struct beacon_data *bcn;
881
882 netif_carrier_off(sdata->dev);
883
884 /* flush STAs and mpaths on this iface */
885 sta_info_flush(sdata);
886 mesh_path_flush_by_iface(sdata);
887
888 /* stop the beacon */
889 ifmsh->mesh_id_len = 0;
890 sdata->vif.bss_conf.enable_beacon = false;
891 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
892 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
893
894 /* remove beacon */
895 bcn = rcu_dereference_protected(ifmsh->beacon,
896 lockdep_is_held(&sdata->wdev.mtx));
897 RCU_INIT_POINTER(ifmsh->beacon, NULL);
898 kfree_rcu(bcn, rcu_head);
899
900 /* free all potentially still buffered group-addressed frames */
901 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
902 skb_queue_purge(&ifmsh->ps.bc_buf);
903
904 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
905 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
906 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
907
908 /* clear any mesh work (for next join) we may have accrued */
909 ifmsh->wrkq_flags = 0;
910 ifmsh->mbss_changed = 0;
911
912 local->fif_other_bss--;
913 atomic_dec(&local->iff_allmultis);
914 ieee80211_configure_filter(local);
915}
916
917static bool
918ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
919 struct ieee802_11_elems *elems, bool beacon)
920{
921 struct cfg80211_csa_settings params;
922 struct ieee80211_csa_ie csa_ie;
923 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
924 enum nl80211_band band = ieee80211_get_sdata_band(sdata);
925 int err;
926 u32 sta_flags;
927
928 sdata_assert_lock(sdata);
929
930 sta_flags = IEEE80211_STA_DISABLE_VHT;
931 switch (sdata->vif.bss_conf.chandef.width) {
932 case NL80211_CHAN_WIDTH_20_NOHT:
933 sta_flags |= IEEE80211_STA_DISABLE_HT;
934 case NL80211_CHAN_WIDTH_20:
935 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
936 break;
937 default:
938 break;
939 }
940
941 memset(¶ms, 0, sizeof(params));
942 memset(&csa_ie, 0, sizeof(csa_ie));
943 err = ieee80211_parse_ch_switch_ie(sdata, elems, band,
944 sta_flags, sdata->vif.addr,
945 &csa_ie);
946 if (err < 0)
947 return false;
948 if (err)
949 return false;
950
951 params.chandef = csa_ie.chandef;
952 params.count = csa_ie.count;
953
954 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
955 IEEE80211_CHAN_DISABLED)) {
956 sdata_info(sdata,
957 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
958 sdata->vif.addr,
959 params.chandef.chan->center_freq,
960 params.chandef.width,
961 params.chandef.center_freq1,
962 params.chandef.center_freq2);
963 return false;
964 }
965
966 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
967 ¶ms.chandef,
968 NL80211_IFTYPE_MESH_POINT);
969 if (err < 0)
970 return false;
971 if (err > 0)
972 /* TODO: DFS not (yet) supported */
973 return false;
974
975 params.radar_required = err;
976
977 if (cfg80211_chandef_identical(¶ms.chandef,
978 &sdata->vif.bss_conf.chandef)) {
979 mcsa_dbg(sdata,
980 "received csa with an identical chandef, ignoring\n");
981 return true;
982 }
983
984 mcsa_dbg(sdata,
985 "received channel switch announcement to go to channel %d MHz\n",
986 params.chandef.chan->center_freq);
987
988 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
989 if (beacon) {
990 ifmsh->chsw_ttl = csa_ie.ttl - 1;
991 if (ifmsh->pre_value >= csa_ie.pre_value)
992 return false;
993 ifmsh->pre_value = csa_ie.pre_value;
994 }
995
996 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
997 return false;
998
999 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1000
1001 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1002 ¶ms) < 0)
1003 return false;
1004
1005 return true;
1006}
1007
1008static void
1009ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1010 struct ieee80211_mgmt *mgmt, size_t len)
1011{
1012 struct ieee80211_local *local = sdata->local;
1013 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1014 struct sk_buff *presp;
1015 struct beacon_data *bcn;
1016 struct ieee80211_mgmt *hdr;
1017 struct ieee802_11_elems elems;
1018 size_t baselen;
1019 u8 *pos;
1020
1021 pos = mgmt->u.probe_req.variable;
1022 baselen = (u8 *) pos - (u8 *) mgmt;
1023 if (baselen > len)
1024 return;
1025
1026 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1027
1028 if (!elems.mesh_id)
1029 return;
1030
1031 /* 802.11-2012 10.1.4.3.2 */
1032 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1033 !is_broadcast_ether_addr(mgmt->da)) ||
1034 elems.ssid_len != 0)
1035 return;
1036
1037 if (elems.mesh_id_len != 0 &&
1038 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1039 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1040 return;
1041
1042 rcu_read_lock();
1043 bcn = rcu_dereference(ifmsh->beacon);
1044
1045 if (!bcn)
1046 goto out;
1047
1048 presp = dev_alloc_skb(local->tx_headroom +
1049 bcn->head_len + bcn->tail_len);
1050 if (!presp)
1051 goto out;
1052
1053 skb_reserve(presp, local->tx_headroom);
1054 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1055 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1056 hdr = (struct ieee80211_mgmt *) presp->data;
1057 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1058 IEEE80211_STYPE_PROBE_RESP);
1059 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1060 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1061 ieee80211_tx_skb(sdata, presp);
1062out:
1063 rcu_read_unlock();
1064}
1065
1066static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1067 u16 stype,
1068 struct ieee80211_mgmt *mgmt,
1069 size_t len,
1070 struct ieee80211_rx_status *rx_status)
1071{
1072 struct ieee80211_local *local = sdata->local;
1073 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1074 struct ieee802_11_elems elems;
1075 struct ieee80211_channel *channel;
1076 size_t baselen;
1077 int freq;
1078 enum nl80211_band band = rx_status->band;
1079
1080 /* ignore ProbeResp to foreign address */
1081 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1082 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1083 return;
1084
1085 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1086 if (baselen > len)
1087 return;
1088
1089 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1090 false, &elems);
1091
1092 /* ignore non-mesh or secure / unsecure mismatch */
1093 if ((!elems.mesh_id || !elems.mesh_config) ||
1094 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1095 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1096 return;
1097
1098 if (elems.ds_params)
1099 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1100 else
1101 freq = rx_status->freq;
1102
1103 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1104
1105 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1106 return;
1107
1108 if (mesh_matches_local(sdata, &elems))
1109 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1110
1111 if (ifmsh->sync_ops)
1112 ifmsh->sync_ops->rx_bcn_presp(sdata,
1113 stype, mgmt, &elems, rx_status);
1114
1115 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1116 !sdata->vif.csa_active)
1117 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1118}
1119
1120int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1121{
1122 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1123 struct mesh_csa_settings *tmp_csa_settings;
1124 int ret = 0;
1125 int changed = 0;
1126
1127 /* Reset the TTL value and Initiator flag */
1128 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1129 ifmsh->chsw_ttl = 0;
1130
1131 /* Remove the CSA and MCSP elements from the beacon */
1132 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1133 RCU_INIT_POINTER(ifmsh->csa, NULL);
1134 if (tmp_csa_settings)
1135 kfree_rcu(tmp_csa_settings, rcu_head);
1136 ret = ieee80211_mesh_rebuild_beacon(sdata);
1137 if (ret)
1138 return -EINVAL;
1139
1140 changed |= BSS_CHANGED_BEACON;
1141
1142 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1143 sdata->vif.bss_conf.chandef.chan->center_freq);
1144 return changed;
1145}
1146
1147int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1148 struct cfg80211_csa_settings *csa_settings)
1149{
1150 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1151 struct mesh_csa_settings *tmp_csa_settings;
1152 int ret = 0;
1153
1154 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1155 GFP_ATOMIC);
1156 if (!tmp_csa_settings)
1157 return -ENOMEM;
1158
1159 memcpy(&tmp_csa_settings->settings, csa_settings,
1160 sizeof(struct cfg80211_csa_settings));
1161
1162 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1163
1164 ret = ieee80211_mesh_rebuild_beacon(sdata);
1165 if (ret) {
1166 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1167 RCU_INIT_POINTER(ifmsh->csa, NULL);
1168 kfree_rcu(tmp_csa_settings, rcu_head);
1169 return ret;
1170 }
1171
1172 return BSS_CHANGED_BEACON;
1173}
1174
1175static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1176 struct ieee80211_mgmt *mgmt, size_t len)
1177{
1178 struct ieee80211_mgmt *mgmt_fwd;
1179 struct sk_buff *skb;
1180 struct ieee80211_local *local = sdata->local;
1181 u8 *pos = mgmt->u.action.u.chan_switch.variable;
1182 size_t offset_ttl;
1183
1184 skb = dev_alloc_skb(local->tx_headroom + len);
1185 if (!skb)
1186 return -ENOMEM;
1187 skb_reserve(skb, local->tx_headroom);
1188 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1189
1190 /* offset_ttl is based on whether the secondary channel
1191 * offset is available or not. Subtract 1 from the mesh TTL
1192 * and disable the initiator flag before forwarding.
1193 */
1194 offset_ttl = (len < 42) ? 7 : 10;
1195 *(pos + offset_ttl) -= 1;
1196 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1197
1198 memcpy(mgmt_fwd, mgmt, len);
1199 eth_broadcast_addr(mgmt_fwd->da);
1200 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1201 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1202
1203 ieee80211_tx_skb(sdata, skb);
1204 return 0;
1205}
1206
1207static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1208 struct ieee80211_mgmt *mgmt, size_t len)
1209{
1210 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1211 struct ieee802_11_elems elems;
1212 u16 pre_value;
1213 bool fwd_csa = true;
1214 size_t baselen;
1215 u8 *pos;
1216
1217 if (mgmt->u.action.u.measurement.action_code !=
1218 WLAN_ACTION_SPCT_CHL_SWITCH)
1219 return;
1220
1221 pos = mgmt->u.action.u.chan_switch.variable;
1222 baselen = offsetof(struct ieee80211_mgmt,
1223 u.action.u.chan_switch.variable);
1224 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1225
1226 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1227 if (!--ifmsh->chsw_ttl)
1228 fwd_csa = false;
1229
1230 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1231 if (ifmsh->pre_value >= pre_value)
1232 return;
1233
1234 ifmsh->pre_value = pre_value;
1235
1236 if (!sdata->vif.csa_active &&
1237 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1238 mcsa_dbg(sdata, "Failed to process CSA action frame");
1239 return;
1240 }
1241
1242 /* forward or re-broadcast the CSA frame */
1243 if (fwd_csa) {
1244 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1245 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1246 }
1247}
1248
1249static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1250 struct ieee80211_mgmt *mgmt,
1251 size_t len,
1252 struct ieee80211_rx_status *rx_status)
1253{
1254 switch (mgmt->u.action.category) {
1255 case WLAN_CATEGORY_SELF_PROTECTED:
1256 switch (mgmt->u.action.u.self_prot.action_code) {
1257 case WLAN_SP_MESH_PEERING_OPEN:
1258 case WLAN_SP_MESH_PEERING_CLOSE:
1259 case WLAN_SP_MESH_PEERING_CONFIRM:
1260 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1261 break;
1262 }
1263 break;
1264 case WLAN_CATEGORY_MESH_ACTION:
1265 if (mesh_action_is_path_sel(mgmt))
1266 mesh_rx_path_sel_frame(sdata, mgmt, len);
1267 break;
1268 case WLAN_CATEGORY_SPECTRUM_MGMT:
1269 mesh_rx_csa_frame(sdata, mgmt, len);
1270 break;
1271 }
1272}
1273
1274void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1275 struct sk_buff *skb)
1276{
1277 struct ieee80211_rx_status *rx_status;
1278 struct ieee80211_mgmt *mgmt;
1279 u16 stype;
1280
1281 sdata_lock(sdata);
1282
1283 /* mesh already went down */
1284 if (!sdata->u.mesh.mesh_id_len)
1285 goto out;
1286
1287 rx_status = IEEE80211_SKB_RXCB(skb);
1288 mgmt = (struct ieee80211_mgmt *) skb->data;
1289 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1290
1291 switch (stype) {
1292 case IEEE80211_STYPE_PROBE_RESP:
1293 case IEEE80211_STYPE_BEACON:
1294 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1295 rx_status);
1296 break;
1297 case IEEE80211_STYPE_PROBE_REQ:
1298 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1299 break;
1300 case IEEE80211_STYPE_ACTION:
1301 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1302 break;
1303 }
1304out:
1305 sdata_unlock(sdata);
1306}
1307
1308static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1309{
1310 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1311 u32 bit, changed = 0;
1312
1313 for_each_set_bit(bit, &ifmsh->mbss_changed,
1314 sizeof(changed) * BITS_PER_BYTE) {
1315 clear_bit(bit, &ifmsh->mbss_changed);
1316 changed |= BIT(bit);
1317 }
1318
1319 if (sdata->vif.bss_conf.enable_beacon &&
1320 (changed & (BSS_CHANGED_BEACON |
1321 BSS_CHANGED_HT |
1322 BSS_CHANGED_BASIC_RATES |
1323 BSS_CHANGED_BEACON_INT)))
1324 if (ieee80211_mesh_rebuild_beacon(sdata))
1325 return;
1326
1327 ieee80211_bss_info_change_notify(sdata, changed);
1328}
1329
1330void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1331{
1332 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1333
1334 sdata_lock(sdata);
1335
1336 /* mesh already went down */
1337 if (!sdata->u.mesh.mesh_id_len)
1338 goto out;
1339
1340 if (ifmsh->preq_queue_len &&
1341 time_after(jiffies,
1342 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1343 mesh_path_start_discovery(sdata);
1344
1345 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1346 ieee80211_mesh_housekeeping(sdata);
1347
1348 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1349 ieee80211_mesh_rootpath(sdata);
1350
1351 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1352 mesh_sync_adjust_tbtt(sdata);
1353
1354 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1355 mesh_bss_info_changed(sdata);
1356out:
1357 sdata_unlock(sdata);
1358}
1359
1360
1361void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1362{
1363 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1364 static u8 zero_addr[ETH_ALEN] = {};
1365
1366 setup_timer(&ifmsh->housekeeping_timer,
1367 ieee80211_mesh_housekeeping_timer,
1368 (unsigned long) sdata);
1369
1370 ifmsh->accepting_plinks = true;
1371 atomic_set(&ifmsh->mpaths, 0);
1372 mesh_rmc_init(sdata);
1373 ifmsh->last_preq = jiffies;
1374 ifmsh->next_perr = jiffies;
1375 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1376 /* Allocate all mesh structures when creating the first mesh interface. */
1377 if (!mesh_allocated)
1378 ieee80211s_init();
1379
1380 mesh_pathtbl_init(sdata);
1381
1382 setup_timer(&ifmsh->mesh_path_timer,
1383 ieee80211_mesh_path_timer,
1384 (unsigned long) sdata);
1385 setup_timer(&ifmsh->mesh_path_root_timer,
1386 ieee80211_mesh_path_root_timer,
1387 (unsigned long) sdata);
1388 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1389 skb_queue_head_init(&ifmsh->ps.bc_buf);
1390 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1391 spin_lock_init(&ifmsh->sync_offset_lock);
1392 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1393
1394 sdata->vif.bss_conf.bssid = zero_addr;
1395}
1396
1397void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1398{
1399 mesh_rmc_free(sdata);
1400 mesh_pathtbl_unregister(sdata);
1401}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2018 - 2019 Intel Corporation
5 * Authors: Luis Carlos Cobo <luisca@cozybit.com>
6 * Javier Cardona <javier@cozybit.com>
7 */
8
9#include <linux/slab.h>
10#include <asm/unaligned.h>
11#include "ieee80211_i.h"
12#include "mesh.h"
13#include "driver-ops.h"
14
15static int mesh_allocated;
16static struct kmem_cache *rm_cache;
17
18bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
19{
20 return (mgmt->u.action.u.mesh_action.action_code ==
21 WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
22}
23
24void ieee80211s_init(void)
25{
26 mesh_allocated = 1;
27 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
28 0, 0, NULL);
29}
30
31void ieee80211s_stop(void)
32{
33 if (!mesh_allocated)
34 return;
35 kmem_cache_destroy(rm_cache);
36}
37
38static void ieee80211_mesh_housekeeping_timer(struct timer_list *t)
39{
40 struct ieee80211_sub_if_data *sdata =
41 from_timer(sdata, t, u.mesh.housekeeping_timer);
42 struct ieee80211_local *local = sdata->local;
43 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
44
45 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
46
47 ieee80211_queue_work(&local->hw, &sdata->work);
48}
49
50/**
51 * mesh_matches_local - check if the config of a mesh point matches ours
52 *
53 * @sdata: local mesh subif
54 * @ie: information elements of a management frame from the mesh peer
55 *
56 * This function checks if the mesh configuration of a mesh point matches the
57 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
58 */
59bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
60 struct ieee802_11_elems *ie)
61{
62 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
63 u32 basic_rates = 0;
64 struct cfg80211_chan_def sta_chan_def;
65 struct ieee80211_supported_band *sband;
66
67 /*
68 * As support for each feature is added, check for matching
69 * - On mesh config capabilities
70 * - Power Save Support En
71 * - Sync support enabled
72 * - Sync support active
73 * - Sync support required from peer
74 * - MDA enabled
75 * - Power management control on fc
76 */
77 if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
78 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
79 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
80 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
81 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
82 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
83 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
84 return false;
85
86 sband = ieee80211_get_sband(sdata);
87 if (!sband)
88 return false;
89
90 ieee80211_sta_get_rates(sdata, ie, sband->band,
91 &basic_rates);
92
93 if (sdata->vif.bss_conf.basic_rates != basic_rates)
94 return false;
95
96 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
97 NL80211_CHAN_NO_HT);
98 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
99 ieee80211_chandef_vht_oper(&sdata->local->hw,
100 ie->vht_operation, ie->ht_operation,
101 &sta_chan_def);
102
103 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
104 &sta_chan_def))
105 return false;
106
107 return true;
108}
109
110/**
111 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
112 *
113 * @ie: information elements of a management frame from the mesh peer
114 */
115bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
116{
117 return (ie->mesh_config->meshconf_cap &
118 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
119}
120
121/**
122 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
123 *
124 * @sdata: mesh interface in which mesh beacons are going to be updated
125 *
126 * Returns: beacon changed flag if the beacon content changed.
127 */
128u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
129{
130 bool free_plinks;
131 u32 changed = 0;
132
133 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
134 * the mesh interface might be able to establish plinks with peers that
135 * are already on the table but are not on PLINK_ESTAB state. However,
136 * in general the mesh interface is not accepting peer link requests
137 * from new peers, and that must be reflected in the beacon
138 */
139 free_plinks = mesh_plink_availables(sdata);
140
141 if (free_plinks != sdata->u.mesh.accepting_plinks) {
142 sdata->u.mesh.accepting_plinks = free_plinks;
143 changed = BSS_CHANGED_BEACON;
144 }
145
146 return changed;
147}
148
149/*
150 * mesh_sta_cleanup - clean up any mesh sta state
151 *
152 * @sta: mesh sta to clean up.
153 */
154void mesh_sta_cleanup(struct sta_info *sta)
155{
156 struct ieee80211_sub_if_data *sdata = sta->sdata;
157 u32 changed = mesh_plink_deactivate(sta);
158
159 if (changed)
160 ieee80211_mbss_info_change_notify(sdata, changed);
161}
162
163int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
164{
165 int i;
166
167 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
168 if (!sdata->u.mesh.rmc)
169 return -ENOMEM;
170 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
171 for (i = 0; i < RMC_BUCKETS; i++)
172 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
173 return 0;
174}
175
176void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
177{
178 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
179 struct rmc_entry *p;
180 struct hlist_node *n;
181 int i;
182
183 if (!sdata->u.mesh.rmc)
184 return;
185
186 for (i = 0; i < RMC_BUCKETS; i++) {
187 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
188 hlist_del(&p->list);
189 kmem_cache_free(rm_cache, p);
190 }
191 }
192
193 kfree(rmc);
194 sdata->u.mesh.rmc = NULL;
195}
196
197/**
198 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
199 *
200 * @sdata: interface
201 * @sa: source address
202 * @mesh_hdr: mesh_header
203 *
204 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
205 *
206 * Checks using the source address and the mesh sequence number if we have
207 * received this frame lately. If the frame is not in the cache, it is added to
208 * it.
209 */
210int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
211 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
212{
213 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
214 u32 seqnum = 0;
215 int entries = 0;
216 u8 idx;
217 struct rmc_entry *p;
218 struct hlist_node *n;
219
220 if (!rmc)
221 return -1;
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 hlist_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 hlist_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 hlist_add_head(&p->list, &rmc->bucket[idx]);
245 return 0;
246}
247
248int 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 bool is_connected_to_gate = ifmsh->num_gates > 0 ||
255 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
256 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
257
258 if (skb_tailroom(skb) < 2 + meshconf_len)
259 return -ENOMEM;
260
261 pos = skb_put(skb, 2 + meshconf_len);
262 *pos++ = WLAN_EID_MESH_CONFIG;
263 *pos++ = meshconf_len;
264
265 /* save a pointer for quick updates in pre-tbtt */
266 ifmsh->meshconf_offset = pos - skb->data;
267
268 /* Active path selection protocol ID */
269 *pos++ = ifmsh->mesh_pp_id;
270 /* Active path selection metric ID */
271 *pos++ = ifmsh->mesh_pm_id;
272 /* Congestion control mode identifier */
273 *pos++ = ifmsh->mesh_cc_id;
274 /* Synchronization protocol identifier */
275 *pos++ = ifmsh->mesh_sp_id;
276 /* Authentication Protocol identifier */
277 *pos++ = ifmsh->mesh_auth_id;
278 /* Mesh Formation Info - number of neighbors */
279 neighbors = atomic_read(&ifmsh->estab_plinks);
280 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
281 *pos++ = (neighbors << 1) | is_connected_to_gate;
282 /* Mesh capability */
283 *pos = 0x00;
284 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
285 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
286 *pos |= ifmsh->accepting_plinks ?
287 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
288 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
289 *pos |= ifmsh->ps_peers_deep_sleep ?
290 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
291 return 0;
292}
293
294int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
295{
296 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
297 u8 *pos;
298
299 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
300 return -ENOMEM;
301
302 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
303 *pos++ = WLAN_EID_MESH_ID;
304 *pos++ = ifmsh->mesh_id_len;
305 if (ifmsh->mesh_id_len)
306 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
307
308 return 0;
309}
310
311static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
312 struct sk_buff *skb)
313{
314 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
315 u8 *pos;
316
317 /* see IEEE802.11-2012 13.14.6 */
318 if (ifmsh->ps_peers_light_sleep == 0 &&
319 ifmsh->ps_peers_deep_sleep == 0 &&
320 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
321 return 0;
322
323 if (skb_tailroom(skb) < 4)
324 return -ENOMEM;
325
326 pos = skb_put(skb, 2 + 2);
327 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
328 *pos++ = 2;
329 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
330
331 return 0;
332}
333
334int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
335 struct sk_buff *skb)
336{
337 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
338 u8 offset, len;
339 const u8 *data;
340
341 if (!ifmsh->ie || !ifmsh->ie_len)
342 return 0;
343
344 /* fast-forward to vendor IEs */
345 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
346
347 if (offset < ifmsh->ie_len) {
348 len = ifmsh->ie_len - offset;
349 data = ifmsh->ie + offset;
350 if (skb_tailroom(skb) < len)
351 return -ENOMEM;
352 skb_put_data(skb, data, len);
353 }
354
355 return 0;
356}
357
358int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
359{
360 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
361 u8 len = 0;
362 const u8 *data;
363
364 if (!ifmsh->ie || !ifmsh->ie_len)
365 return 0;
366
367 /* find RSN IE */
368 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
369 if (!data)
370 return 0;
371
372 len = data[1] + 2;
373
374 if (skb_tailroom(skb) < len)
375 return -ENOMEM;
376 skb_put_data(skb, data, len);
377
378 return 0;
379}
380
381static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
382 struct sk_buff *skb)
383{
384 struct ieee80211_chanctx_conf *chanctx_conf;
385 struct ieee80211_channel *chan;
386 u8 *pos;
387
388 if (skb_tailroom(skb) < 3)
389 return -ENOMEM;
390
391 rcu_read_lock();
392 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
393 if (WARN_ON(!chanctx_conf)) {
394 rcu_read_unlock();
395 return -EINVAL;
396 }
397 chan = chanctx_conf->def.chan;
398 rcu_read_unlock();
399
400 pos = skb_put(skb, 2 + 1);
401 *pos++ = WLAN_EID_DS_PARAMS;
402 *pos++ = 1;
403 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
404
405 return 0;
406}
407
408int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
409 struct sk_buff *skb)
410{
411 struct ieee80211_supported_band *sband;
412 u8 *pos;
413
414 sband = ieee80211_get_sband(sdata);
415 if (!sband)
416 return -EINVAL;
417
418 if (!sband->ht_cap.ht_supported ||
419 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
420 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
421 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
422 return 0;
423
424 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
425 return -ENOMEM;
426
427 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
428 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
429
430 return 0;
431}
432
433int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
434 struct sk_buff *skb)
435{
436 struct ieee80211_local *local = sdata->local;
437 struct ieee80211_chanctx_conf *chanctx_conf;
438 struct ieee80211_channel *channel;
439 struct ieee80211_supported_band *sband;
440 struct ieee80211_sta_ht_cap *ht_cap;
441 u8 *pos;
442
443 rcu_read_lock();
444 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
445 if (WARN_ON(!chanctx_conf)) {
446 rcu_read_unlock();
447 return -EINVAL;
448 }
449 channel = chanctx_conf->def.chan;
450 rcu_read_unlock();
451
452 sband = local->hw.wiphy->bands[channel->band];
453 ht_cap = &sband->ht_cap;
454
455 if (!ht_cap->ht_supported ||
456 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
457 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
458 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
459 return 0;
460
461 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
462 return -ENOMEM;
463
464 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
465 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
466 sdata->vif.bss_conf.ht_operation_mode,
467 false);
468
469 return 0;
470}
471
472int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
473 struct sk_buff *skb)
474{
475 struct ieee80211_supported_band *sband;
476 u8 *pos;
477
478 sband = ieee80211_get_sband(sdata);
479 if (!sband)
480 return -EINVAL;
481
482 if (!sband->vht_cap.vht_supported ||
483 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
484 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
485 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
486 return 0;
487
488 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
489 return -ENOMEM;
490
491 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
492 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
493
494 return 0;
495}
496
497int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
498 struct sk_buff *skb)
499{
500 struct ieee80211_local *local = sdata->local;
501 struct ieee80211_chanctx_conf *chanctx_conf;
502 struct ieee80211_channel *channel;
503 struct ieee80211_supported_band *sband;
504 struct ieee80211_sta_vht_cap *vht_cap;
505 u8 *pos;
506
507 rcu_read_lock();
508 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
509 if (WARN_ON(!chanctx_conf)) {
510 rcu_read_unlock();
511 return -EINVAL;
512 }
513 channel = chanctx_conf->def.chan;
514 rcu_read_unlock();
515
516 sband = local->hw.wiphy->bands[channel->band];
517 vht_cap = &sband->vht_cap;
518
519 if (!vht_cap->vht_supported ||
520 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
521 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
522 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
523 return 0;
524
525 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
526 return -ENOMEM;
527
528 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
529 ieee80211_ie_build_vht_oper(pos, vht_cap,
530 &sdata->vif.bss_conf.chandef);
531
532 return 0;
533}
534
535int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
536 struct sk_buff *skb, u8 ie_len)
537{
538 const struct ieee80211_sta_he_cap *he_cap;
539 struct ieee80211_supported_band *sband;
540 u8 *pos;
541
542 sband = ieee80211_get_sband(sdata);
543 if (!sband)
544 return -EINVAL;
545
546 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
547
548 if (!he_cap ||
549 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
550 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
551 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
552 return 0;
553
554 if (skb_tailroom(skb) < ie_len)
555 return -ENOMEM;
556
557 pos = skb_put(skb, ie_len);
558 ieee80211_ie_build_he_cap(pos, he_cap, pos + ie_len);
559
560 return 0;
561}
562
563int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
564 struct sk_buff *skb)
565{
566 const struct ieee80211_sta_he_cap *he_cap;
567 struct ieee80211_supported_band *sband;
568 u8 *pos;
569
570 sband = ieee80211_get_sband(sdata);
571 if (!sband)
572 return -EINVAL;
573
574 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
575 if (!he_cap ||
576 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
577 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
578 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
579 return 0;
580
581 if (skb_tailroom(skb) < 2 + 1 + sizeof(struct ieee80211_he_operation))
582 return -ENOMEM;
583
584 pos = skb_put(skb, 2 + 1 + sizeof(struct ieee80211_he_operation));
585 ieee80211_ie_build_he_oper(pos);
586
587 return 0;
588}
589
590static void ieee80211_mesh_path_timer(struct timer_list *t)
591{
592 struct ieee80211_sub_if_data *sdata =
593 from_timer(sdata, t, u.mesh.mesh_path_timer);
594
595 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
596}
597
598static void ieee80211_mesh_path_root_timer(struct timer_list *t)
599{
600 struct ieee80211_sub_if_data *sdata =
601 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
602 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
603
604 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
605
606 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
607}
608
609void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
610{
611 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
612 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
613 else {
614 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
615 /* stop running timer */
616 del_timer_sync(&ifmsh->mesh_path_root_timer);
617 }
618}
619
620/**
621 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
622 * @hdr: 802.11 frame header
623 * @fc: frame control field
624 * @meshda: destination address in the mesh
625 * @meshsa: source address address in the mesh. Same as TA, as frame is
626 * locally originated.
627 *
628 * Return the length of the 802.11 (does not include a mesh control header)
629 */
630int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
631 const u8 *meshda, const u8 *meshsa)
632{
633 if (is_multicast_ether_addr(meshda)) {
634 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
635 /* DA TA SA */
636 memcpy(hdr->addr1, meshda, ETH_ALEN);
637 memcpy(hdr->addr2, meshsa, ETH_ALEN);
638 memcpy(hdr->addr3, meshsa, ETH_ALEN);
639 return 24;
640 } else {
641 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
642 /* RA TA DA SA */
643 eth_zero_addr(hdr->addr1); /* RA is resolved later */
644 memcpy(hdr->addr2, meshsa, ETH_ALEN);
645 memcpy(hdr->addr3, meshda, ETH_ALEN);
646 memcpy(hdr->addr4, meshsa, ETH_ALEN);
647 return 30;
648 }
649}
650
651/**
652 * ieee80211_new_mesh_header - create a new mesh header
653 * @sdata: mesh interface to be used
654 * @meshhdr: uninitialized mesh header
655 * @addr4or5: 1st address in the ae header, which may correspond to address 4
656 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
657 * be NULL.
658 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
659 * mesh frame
660 *
661 * Return the header length.
662 */
663unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
664 struct ieee80211s_hdr *meshhdr,
665 const char *addr4or5, const char *addr6)
666{
667 if (WARN_ON(!addr4or5 && addr6))
668 return 0;
669
670 memset(meshhdr, 0, sizeof(*meshhdr));
671
672 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
673
674 /* FIXME: racy -- TX on multiple queues can be concurrent */
675 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
676 sdata->u.mesh.mesh_seqnum++;
677
678 if (addr4or5 && !addr6) {
679 meshhdr->flags |= MESH_FLAGS_AE_A4;
680 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
681 return 2 * ETH_ALEN;
682 } else if (addr4or5 && addr6) {
683 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
684 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
685 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
686 return 3 * ETH_ALEN;
687 }
688
689 return ETH_ALEN;
690}
691
692static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
693{
694 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
695 u32 changed;
696
697 if (ifmsh->mshcfg.plink_timeout > 0)
698 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
699 mesh_path_expire(sdata);
700
701 changed = mesh_accept_plinks_update(sdata);
702 ieee80211_mbss_info_change_notify(sdata, changed);
703
704 mod_timer(&ifmsh->housekeeping_timer,
705 round_jiffies(jiffies +
706 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
707}
708
709static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
710{
711 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
712 u32 interval;
713
714 mesh_path_tx_root_frame(sdata);
715
716 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
717 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
718 else
719 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
720
721 mod_timer(&ifmsh->mesh_path_root_timer,
722 round_jiffies(TU_TO_EXP_TIME(interval)));
723}
724
725static int
726ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
727{
728 struct beacon_data *bcn;
729 int head_len, tail_len;
730 struct sk_buff *skb;
731 struct ieee80211_mgmt *mgmt;
732 struct ieee80211_chanctx_conf *chanctx_conf;
733 struct mesh_csa_settings *csa;
734 enum nl80211_band band;
735 u8 ie_len_he_cap;
736 u8 *pos;
737 struct ieee80211_sub_if_data *sdata;
738 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
739
740 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
741 rcu_read_lock();
742 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
743 band = chanctx_conf->def.chan->band;
744 rcu_read_unlock();
745
746 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
747 NL80211_IFTYPE_MESH_POINT);
748 head_len = hdr_len +
749 2 + /* NULL SSID */
750 /* Channel Switch Announcement */
751 2 + sizeof(struct ieee80211_channel_sw_ie) +
752 /* Mesh Channel Switch Parameters */
753 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
754 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
755 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
756 2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
757 2 + 8 + /* supported rates */
758 2 + 3; /* DS params */
759 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
760 2 + sizeof(struct ieee80211_ht_cap) +
761 2 + sizeof(struct ieee80211_ht_operation) +
762 2 + ifmsh->mesh_id_len +
763 2 + sizeof(struct ieee80211_meshconf_ie) +
764 2 + sizeof(__le16) + /* awake window */
765 2 + sizeof(struct ieee80211_vht_cap) +
766 2 + sizeof(struct ieee80211_vht_operation) +
767 ie_len_he_cap +
768 2 + 1 + sizeof(struct ieee80211_he_operation) +
769 ifmsh->ie_len;
770
771 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
772 /* need an skb for IE builders to operate on */
773 skb = dev_alloc_skb(max(head_len, tail_len));
774
775 if (!bcn || !skb)
776 goto out_free;
777
778 /*
779 * pointers go into the block we allocated,
780 * memory is | beacon_data | head | tail |
781 */
782 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
783
784 /* fill in the head */
785 mgmt = skb_put_zero(skb, hdr_len);
786 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
787 IEEE80211_STYPE_BEACON);
788 eth_broadcast_addr(mgmt->da);
789 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
790 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
791 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
792 mgmt->u.beacon.beacon_int =
793 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
794 mgmt->u.beacon.capab_info |= cpu_to_le16(
795 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
796
797 pos = skb_put(skb, 2);
798 *pos++ = WLAN_EID_SSID;
799 *pos++ = 0x0;
800
801 rcu_read_lock();
802 csa = rcu_dereference(ifmsh->csa);
803 if (csa) {
804 enum nl80211_channel_type ct;
805 struct cfg80211_chan_def *chandef;
806 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
807 2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
808
809 pos = skb_put_zero(skb, ie_len);
810 *pos++ = WLAN_EID_CHANNEL_SWITCH;
811 *pos++ = 3;
812 *pos++ = 0x0;
813 *pos++ = ieee80211_frequency_to_channel(
814 csa->settings.chandef.chan->center_freq);
815 bcn->csa_current_counter = csa->settings.count;
816 bcn->csa_counter_offsets[0] = hdr_len + 6;
817 *pos++ = csa->settings.count;
818 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
819 *pos++ = 6;
820 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
821 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
822 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
823 } else {
824 *pos++ = ifmsh->chsw_ttl;
825 }
826 *pos++ |= csa->settings.block_tx ?
827 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
828 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
829 pos += 2;
830 put_unaligned_le16(ifmsh->pre_value, pos);
831 pos += 2;
832
833 switch (csa->settings.chandef.width) {
834 case NL80211_CHAN_WIDTH_40:
835 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
836 pos = skb_put_zero(skb, ie_len);
837
838 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
839 *pos++ = 1; /* len */
840 ct = cfg80211_get_chandef_type(&csa->settings.chandef);
841 if (ct == NL80211_CHAN_HT40PLUS)
842 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
843 else
844 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
845 break;
846 case NL80211_CHAN_WIDTH_80:
847 case NL80211_CHAN_WIDTH_80P80:
848 case NL80211_CHAN_WIDTH_160:
849 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
850 ie_len = 2 + 2 +
851 sizeof(struct ieee80211_wide_bw_chansw_ie);
852 pos = skb_put_zero(skb, ie_len);
853
854 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
855 *pos++ = 5; /* len */
856 /* put sub IE */
857 chandef = &csa->settings.chandef;
858 ieee80211_ie_build_wide_bw_cs(pos, chandef);
859 break;
860 default:
861 break;
862 }
863 }
864 rcu_read_unlock();
865
866 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
867 mesh_add_ds_params_ie(sdata, skb))
868 goto out_free;
869
870 bcn->head_len = skb->len;
871 memcpy(bcn->head, skb->data, bcn->head_len);
872
873 /* now the tail */
874 skb_trim(skb, 0);
875 bcn->tail = bcn->head + bcn->head_len;
876
877 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
878 mesh_add_rsn_ie(sdata, skb) ||
879 mesh_add_ht_cap_ie(sdata, skb) ||
880 mesh_add_ht_oper_ie(sdata, skb) ||
881 mesh_add_meshid_ie(sdata, skb) ||
882 mesh_add_meshconf_ie(sdata, skb) ||
883 mesh_add_awake_window_ie(sdata, skb) ||
884 mesh_add_vht_cap_ie(sdata, skb) ||
885 mesh_add_vht_oper_ie(sdata, skb) ||
886 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
887 mesh_add_he_oper_ie(sdata, skb) ||
888 mesh_add_vendor_ies(sdata, skb))
889 goto out_free;
890
891 bcn->tail_len = skb->len;
892 memcpy(bcn->tail, skb->data, bcn->tail_len);
893 bcn->meshconf = (struct ieee80211_meshconf_ie *)
894 (bcn->tail + ifmsh->meshconf_offset);
895
896 dev_kfree_skb(skb);
897 rcu_assign_pointer(ifmsh->beacon, bcn);
898 return 0;
899out_free:
900 kfree(bcn);
901 dev_kfree_skb(skb);
902 return -ENOMEM;
903}
904
905static int
906ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
907{
908 struct beacon_data *old_bcn;
909 int ret;
910
911 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
912 lockdep_is_held(&sdata->wdev.mtx));
913 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
914 if (ret)
915 /* just reuse old beacon */
916 return ret;
917
918 if (old_bcn)
919 kfree_rcu(old_bcn, rcu_head);
920 return 0;
921}
922
923void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
924 u32 changed)
925{
926 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
927 unsigned long bits = changed;
928 u32 bit;
929
930 if (!bits)
931 return;
932
933 /* if we race with running work, worst case this work becomes a noop */
934 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
935 set_bit(bit, &ifmsh->mbss_changed);
936 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
937 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
938}
939
940int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
941{
942 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
943 struct ieee80211_local *local = sdata->local;
944 u32 changed = BSS_CHANGED_BEACON |
945 BSS_CHANGED_BEACON_ENABLED |
946 BSS_CHANGED_HT |
947 BSS_CHANGED_BASIC_RATES |
948 BSS_CHANGED_BEACON_INT |
949 BSS_CHANGED_MCAST_RATE;
950
951 local->fif_other_bss++;
952 /* mesh ifaces must set allmulti to forward mcast traffic */
953 atomic_inc(&local->iff_allmultis);
954 ieee80211_configure_filter(local);
955
956 ifmsh->mesh_cc_id = 0; /* Disabled */
957 /* register sync ops from extensible synchronization framework */
958 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
959 ifmsh->sync_offset_clockdrift_max = 0;
960 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
961 ieee80211_mesh_root_setup(ifmsh);
962 ieee80211_queue_work(&local->hw, &sdata->work);
963 sdata->vif.bss_conf.ht_operation_mode =
964 ifmsh->mshcfg.ht_opmode;
965 sdata->vif.bss_conf.enable_beacon = true;
966
967 changed |= ieee80211_mps_local_status_update(sdata);
968
969 if (ieee80211_mesh_build_beacon(ifmsh)) {
970 ieee80211_stop_mesh(sdata);
971 return -ENOMEM;
972 }
973
974 ieee80211_recalc_dtim(local, sdata);
975 ieee80211_bss_info_change_notify(sdata, changed);
976
977 netif_carrier_on(sdata->dev);
978 return 0;
979}
980
981void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
982{
983 struct ieee80211_local *local = sdata->local;
984 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
985 struct beacon_data *bcn;
986
987 netif_carrier_off(sdata->dev);
988
989 /* flush STAs and mpaths on this iface */
990 sta_info_flush(sdata);
991 ieee80211_free_keys(sdata, true);
992 mesh_path_flush_by_iface(sdata);
993
994 /* stop the beacon */
995 ifmsh->mesh_id_len = 0;
996 sdata->vif.bss_conf.enable_beacon = false;
997 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
998 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
999
1000 /* remove beacon */
1001 bcn = rcu_dereference_protected(ifmsh->beacon,
1002 lockdep_is_held(&sdata->wdev.mtx));
1003 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1004 kfree_rcu(bcn, rcu_head);
1005
1006 /* free all potentially still buffered group-addressed frames */
1007 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1008 skb_queue_purge(&ifmsh->ps.bc_buf);
1009
1010 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1011 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1012 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1013
1014 /* clear any mesh work (for next join) we may have accrued */
1015 ifmsh->wrkq_flags = 0;
1016 ifmsh->mbss_changed = 0;
1017
1018 local->fif_other_bss--;
1019 atomic_dec(&local->iff_allmultis);
1020 ieee80211_configure_filter(local);
1021}
1022
1023static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1024{
1025 int err;
1026
1027 /* if the current channel is a DFS channel, mark the channel as
1028 * unavailable.
1029 */
1030 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1031 &sdata->vif.bss_conf.chandef,
1032 NL80211_IFTYPE_MESH_POINT);
1033 if (err > 0)
1034 cfg80211_radar_event(sdata->local->hw.wiphy,
1035 &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1036}
1037
1038static bool
1039ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1040 struct ieee802_11_elems *elems, bool beacon)
1041{
1042 struct cfg80211_csa_settings params;
1043 struct ieee80211_csa_ie csa_ie;
1044 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1045 struct ieee80211_supported_band *sband;
1046 int err;
1047 u32 sta_flags;
1048
1049 sdata_assert_lock(sdata);
1050
1051 sband = ieee80211_get_sband(sdata);
1052 if (!sband)
1053 return false;
1054
1055 sta_flags = 0;
1056 switch (sdata->vif.bss_conf.chandef.width) {
1057 case NL80211_CHAN_WIDTH_20_NOHT:
1058 sta_flags |= IEEE80211_STA_DISABLE_HT;
1059 /* fall through */
1060 case NL80211_CHAN_WIDTH_20:
1061 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
1062 /* fall through */
1063 case NL80211_CHAN_WIDTH_40:
1064 sta_flags |= IEEE80211_STA_DISABLE_VHT;
1065 break;
1066 default:
1067 break;
1068 }
1069
1070 memset(¶ms, 0, sizeof(params));
1071 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1072 sta_flags, sdata->vif.addr,
1073 &csa_ie);
1074 if (err < 0)
1075 return false;
1076 if (err)
1077 return false;
1078
1079 /* Mark the channel unavailable if the reason for the switch is
1080 * regulatory.
1081 */
1082 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1083 ieee80211_mesh_csa_mark_radar(sdata);
1084
1085 params.chandef = csa_ie.chandef;
1086 params.count = csa_ie.count;
1087
1088 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
1089 IEEE80211_CHAN_DISABLED) ||
1090 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
1091 NL80211_IFTYPE_MESH_POINT)) {
1092 sdata_info(sdata,
1093 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1094 sdata->vif.addr,
1095 params.chandef.chan->center_freq,
1096 params.chandef.width,
1097 params.chandef.center_freq1,
1098 params.chandef.center_freq2);
1099 return false;
1100 }
1101
1102 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1103 ¶ms.chandef,
1104 NL80211_IFTYPE_MESH_POINT);
1105 if (err < 0)
1106 return false;
1107 if (err > 0 && !ifmsh->userspace_handles_dfs) {
1108 sdata_info(sdata,
1109 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1110 sdata->vif.addr,
1111 params.chandef.chan->center_freq,
1112 params.chandef.width,
1113 params.chandef.center_freq1,
1114 params.chandef.center_freq2);
1115 return false;
1116 }
1117
1118 params.radar_required = err;
1119
1120 if (cfg80211_chandef_identical(¶ms.chandef,
1121 &sdata->vif.bss_conf.chandef)) {
1122 mcsa_dbg(sdata,
1123 "received csa with an identical chandef, ignoring\n");
1124 return true;
1125 }
1126
1127 mcsa_dbg(sdata,
1128 "received channel switch announcement to go to channel %d MHz\n",
1129 params.chandef.chan->center_freq);
1130
1131 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1132 if (beacon) {
1133 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1134 if (ifmsh->pre_value >= csa_ie.pre_value)
1135 return false;
1136 ifmsh->pre_value = csa_ie.pre_value;
1137 }
1138
1139 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1140 return false;
1141
1142 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1143
1144 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1145 ¶ms) < 0)
1146 return false;
1147
1148 return true;
1149}
1150
1151static void
1152ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1153 struct ieee80211_mgmt *mgmt, size_t len)
1154{
1155 struct ieee80211_local *local = sdata->local;
1156 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1157 struct sk_buff *presp;
1158 struct beacon_data *bcn;
1159 struct ieee80211_mgmt *hdr;
1160 struct ieee802_11_elems elems;
1161 size_t baselen;
1162 u8 *pos;
1163
1164 pos = mgmt->u.probe_req.variable;
1165 baselen = (u8 *) pos - (u8 *) mgmt;
1166 if (baselen > len)
1167 return;
1168
1169 ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid,
1170 NULL);
1171
1172 if (!elems.mesh_id)
1173 return;
1174
1175 /* 802.11-2012 10.1.4.3.2 */
1176 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1177 !is_broadcast_ether_addr(mgmt->da)) ||
1178 elems.ssid_len != 0)
1179 return;
1180
1181 if (elems.mesh_id_len != 0 &&
1182 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1183 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1184 return;
1185
1186 rcu_read_lock();
1187 bcn = rcu_dereference(ifmsh->beacon);
1188
1189 if (!bcn)
1190 goto out;
1191
1192 presp = dev_alloc_skb(local->tx_headroom +
1193 bcn->head_len + bcn->tail_len);
1194 if (!presp)
1195 goto out;
1196
1197 skb_reserve(presp, local->tx_headroom);
1198 skb_put_data(presp, bcn->head, bcn->head_len);
1199 skb_put_data(presp, bcn->tail, bcn->tail_len);
1200 hdr = (struct ieee80211_mgmt *) presp->data;
1201 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1202 IEEE80211_STYPE_PROBE_RESP);
1203 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1204 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1205 ieee80211_tx_skb(sdata, presp);
1206out:
1207 rcu_read_unlock();
1208}
1209
1210static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1211 u16 stype,
1212 struct ieee80211_mgmt *mgmt,
1213 size_t len,
1214 struct ieee80211_rx_status *rx_status)
1215{
1216 struct ieee80211_local *local = sdata->local;
1217 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1218 struct ieee802_11_elems elems;
1219 struct ieee80211_channel *channel;
1220 size_t baselen;
1221 int freq;
1222 enum nl80211_band band = rx_status->band;
1223
1224 /* ignore ProbeResp to foreign address */
1225 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1226 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1227 return;
1228
1229 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1230 if (baselen > len)
1231 return;
1232
1233 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1234 false, &elems, mgmt->bssid, NULL);
1235
1236 /* ignore non-mesh or secure / unsecure mismatch */
1237 if ((!elems.mesh_id || !elems.mesh_config) ||
1238 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1239 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1240 return;
1241
1242 if (elems.ds_params)
1243 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1244 else
1245 freq = rx_status->freq;
1246
1247 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1248
1249 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1250 return;
1251
1252 if (mesh_matches_local(sdata, &elems)) {
1253 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1254 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1255 if (!sdata->u.mesh.user_mpm ||
1256 sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1257 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1258 mesh_neighbour_update(sdata, mgmt->sa, &elems,
1259 rx_status);
1260 }
1261
1262 if (ifmsh->sync_ops)
1263 ifmsh->sync_ops->rx_bcn_presp(sdata,
1264 stype, mgmt, &elems, rx_status);
1265
1266 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1267 !sdata->vif.csa_active)
1268 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1269}
1270
1271int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1272{
1273 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1274 struct mesh_csa_settings *tmp_csa_settings;
1275 int ret = 0;
1276 int changed = 0;
1277
1278 /* Reset the TTL value and Initiator flag */
1279 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1280 ifmsh->chsw_ttl = 0;
1281
1282 /* Remove the CSA and MCSP elements from the beacon */
1283 tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
1284 lockdep_is_held(&sdata->wdev.mtx));
1285 RCU_INIT_POINTER(ifmsh->csa, NULL);
1286 if (tmp_csa_settings)
1287 kfree_rcu(tmp_csa_settings, rcu_head);
1288 ret = ieee80211_mesh_rebuild_beacon(sdata);
1289 if (ret)
1290 return -EINVAL;
1291
1292 changed |= BSS_CHANGED_BEACON;
1293
1294 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1295 sdata->vif.bss_conf.chandef.chan->center_freq);
1296 return changed;
1297}
1298
1299int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1300 struct cfg80211_csa_settings *csa_settings)
1301{
1302 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1303 struct mesh_csa_settings *tmp_csa_settings;
1304 int ret = 0;
1305
1306 lockdep_assert_held(&sdata->wdev.mtx);
1307
1308 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1309 GFP_ATOMIC);
1310 if (!tmp_csa_settings)
1311 return -ENOMEM;
1312
1313 memcpy(&tmp_csa_settings->settings, csa_settings,
1314 sizeof(struct cfg80211_csa_settings));
1315
1316 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1317
1318 ret = ieee80211_mesh_rebuild_beacon(sdata);
1319 if (ret) {
1320 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1321 RCU_INIT_POINTER(ifmsh->csa, NULL);
1322 kfree_rcu(tmp_csa_settings, rcu_head);
1323 return ret;
1324 }
1325
1326 return BSS_CHANGED_BEACON;
1327}
1328
1329static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1330 struct ieee80211_mgmt *mgmt, size_t len,
1331 struct ieee802_11_elems *elems)
1332{
1333 struct ieee80211_mgmt *mgmt_fwd;
1334 struct sk_buff *skb;
1335 struct ieee80211_local *local = sdata->local;
1336
1337 skb = dev_alloc_skb(local->tx_headroom + len);
1338 if (!skb)
1339 return -ENOMEM;
1340 skb_reserve(skb, local->tx_headroom);
1341 mgmt_fwd = skb_put(skb, len);
1342
1343 elems->mesh_chansw_params_ie->mesh_ttl--;
1344 elems->mesh_chansw_params_ie->mesh_flags &=
1345 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1346
1347 memcpy(mgmt_fwd, mgmt, len);
1348 eth_broadcast_addr(mgmt_fwd->da);
1349 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1350 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1351
1352 ieee80211_tx_skb(sdata, skb);
1353 return 0;
1354}
1355
1356static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1357 struct ieee80211_mgmt *mgmt, size_t len)
1358{
1359 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1360 struct ieee802_11_elems elems;
1361 u16 pre_value;
1362 bool fwd_csa = true;
1363 size_t baselen;
1364 u8 *pos;
1365
1366 if (mgmt->u.action.u.measurement.action_code !=
1367 WLAN_ACTION_SPCT_CHL_SWITCH)
1368 return;
1369
1370 pos = mgmt->u.action.u.chan_switch.variable;
1371 baselen = offsetof(struct ieee80211_mgmt,
1372 u.action.u.chan_switch.variable);
1373 ieee802_11_parse_elems(pos, len - baselen, true, &elems,
1374 mgmt->bssid, NULL);
1375
1376 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1377 if (!--ifmsh->chsw_ttl)
1378 fwd_csa = false;
1379
1380 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1381 if (ifmsh->pre_value >= pre_value)
1382 return;
1383
1384 ifmsh->pre_value = pre_value;
1385
1386 if (!sdata->vif.csa_active &&
1387 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1388 mcsa_dbg(sdata, "Failed to process CSA action frame");
1389 return;
1390 }
1391
1392 /* forward or re-broadcast the CSA frame */
1393 if (fwd_csa) {
1394 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0)
1395 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1396 }
1397}
1398
1399static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1400 struct ieee80211_mgmt *mgmt,
1401 size_t len,
1402 struct ieee80211_rx_status *rx_status)
1403{
1404 switch (mgmt->u.action.category) {
1405 case WLAN_CATEGORY_SELF_PROTECTED:
1406 switch (mgmt->u.action.u.self_prot.action_code) {
1407 case WLAN_SP_MESH_PEERING_OPEN:
1408 case WLAN_SP_MESH_PEERING_CLOSE:
1409 case WLAN_SP_MESH_PEERING_CONFIRM:
1410 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1411 break;
1412 }
1413 break;
1414 case WLAN_CATEGORY_MESH_ACTION:
1415 if (mesh_action_is_path_sel(mgmt))
1416 mesh_rx_path_sel_frame(sdata, mgmt, len);
1417 break;
1418 case WLAN_CATEGORY_SPECTRUM_MGMT:
1419 mesh_rx_csa_frame(sdata, mgmt, len);
1420 break;
1421 }
1422}
1423
1424void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1425 struct sk_buff *skb)
1426{
1427 struct ieee80211_rx_status *rx_status;
1428 struct ieee80211_mgmt *mgmt;
1429 u16 stype;
1430
1431 sdata_lock(sdata);
1432
1433 /* mesh already went down */
1434 if (!sdata->u.mesh.mesh_id_len)
1435 goto out;
1436
1437 rx_status = IEEE80211_SKB_RXCB(skb);
1438 mgmt = (struct ieee80211_mgmt *) skb->data;
1439 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1440
1441 switch (stype) {
1442 case IEEE80211_STYPE_PROBE_RESP:
1443 case IEEE80211_STYPE_BEACON:
1444 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1445 rx_status);
1446 break;
1447 case IEEE80211_STYPE_PROBE_REQ:
1448 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1449 break;
1450 case IEEE80211_STYPE_ACTION:
1451 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1452 break;
1453 }
1454out:
1455 sdata_unlock(sdata);
1456}
1457
1458static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1459{
1460 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1461 u32 bit, changed = 0;
1462
1463 for_each_set_bit(bit, &ifmsh->mbss_changed,
1464 sizeof(changed) * BITS_PER_BYTE) {
1465 clear_bit(bit, &ifmsh->mbss_changed);
1466 changed |= BIT(bit);
1467 }
1468
1469 if (sdata->vif.bss_conf.enable_beacon &&
1470 (changed & (BSS_CHANGED_BEACON |
1471 BSS_CHANGED_HT |
1472 BSS_CHANGED_BASIC_RATES |
1473 BSS_CHANGED_BEACON_INT)))
1474 if (ieee80211_mesh_rebuild_beacon(sdata))
1475 return;
1476
1477 ieee80211_bss_info_change_notify(sdata, changed);
1478}
1479
1480void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1481{
1482 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1483
1484 sdata_lock(sdata);
1485
1486 /* mesh already went down */
1487 if (!sdata->u.mesh.mesh_id_len)
1488 goto out;
1489
1490 if (ifmsh->preq_queue_len &&
1491 time_after(jiffies,
1492 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1493 mesh_path_start_discovery(sdata);
1494
1495 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1496 ieee80211_mesh_housekeeping(sdata);
1497
1498 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1499 ieee80211_mesh_rootpath(sdata);
1500
1501 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1502 mesh_sync_adjust_tsf(sdata);
1503
1504 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1505 mesh_bss_info_changed(sdata);
1506out:
1507 sdata_unlock(sdata);
1508}
1509
1510
1511void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1512{
1513 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1514 static u8 zero_addr[ETH_ALEN] = {};
1515
1516 timer_setup(&ifmsh->housekeeping_timer,
1517 ieee80211_mesh_housekeeping_timer, 0);
1518
1519 ifmsh->accepting_plinks = true;
1520 atomic_set(&ifmsh->mpaths, 0);
1521 mesh_rmc_init(sdata);
1522 ifmsh->last_preq = jiffies;
1523 ifmsh->next_perr = jiffies;
1524 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1525 /* Allocate all mesh structures when creating the first mesh interface. */
1526 if (!mesh_allocated)
1527 ieee80211s_init();
1528
1529 mesh_pathtbl_init(sdata);
1530
1531 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1532 timer_setup(&ifmsh->mesh_path_root_timer,
1533 ieee80211_mesh_path_root_timer, 0);
1534 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1535 skb_queue_head_init(&ifmsh->ps.bc_buf);
1536 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1537 spin_lock_init(&ifmsh->sync_offset_lock);
1538 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1539
1540 sdata->vif.bss_conf.bssid = zero_addr;
1541}
1542
1543void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1544{
1545 mesh_rmc_free(sdata);
1546 mesh_pathtbl_unregister(sdata);
1547}