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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2018 - 2020 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
15 static int mesh_allocated;
16 static struct kmem_cache *rm_cache;
17
18 bool 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
24 void 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
31 void ieee80211s_stop(void)
32 {
33 if (!mesh_allocated)
34 return;
35 kmem_cache_destroy(rm_cache);
36 }
37
38 static 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 */
59 bool 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 u32 vht_cap_info = 0;
67
68 /*
69 * As support for each feature is added, check for matching
70 * - On mesh config capabilities
71 * - Power Save Support En
72 * - Sync support enabled
73 * - Sync support active
74 * - Sync support required from peer
75 * - MDA enabled
76 * - Power management control on fc
77 */
78 if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
79 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
80 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
81 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
82 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
83 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
84 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
85 return false;
86
87 sband = ieee80211_get_sband(sdata);
88 if (!sband)
89 return false;
90
91 ieee80211_sta_get_rates(sdata, ie, sband->band,
92 &basic_rates);
93
94 if (sdata->vif.bss_conf.basic_rates != basic_rates)
95 return false;
96
97 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
98 NL80211_CHAN_NO_HT);
99 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
100
101 if (ie->vht_cap_elem)
102 vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info);
103
104 ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
105 ie->vht_operation, ie->ht_operation,
106 &sta_chan_def);
107 ieee80211_chandef_he_6ghz_oper(sdata, ie->he_operation, &sta_chan_def);
108
109 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
110 &sta_chan_def))
111 return false;
112
113 return true;
114 }
115
116 /**
117 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
118 *
119 * @ie: information elements of a management frame from the mesh peer
120 */
121 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
122 {
123 return (ie->mesh_config->meshconf_cap &
124 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
125 }
126
127 /**
128 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
129 *
130 * @sdata: mesh interface in which mesh beacons are going to be updated
131 *
132 * Returns: beacon changed flag if the beacon content changed.
133 */
134 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
135 {
136 bool free_plinks;
137 u32 changed = 0;
138
139 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
140 * the mesh interface might be able to establish plinks with peers that
141 * are already on the table but are not on PLINK_ESTAB state. However,
142 * in general the mesh interface is not accepting peer link requests
143 * from new peers, and that must be reflected in the beacon
144 */
145 free_plinks = mesh_plink_availables(sdata);
146
147 if (free_plinks != sdata->u.mesh.accepting_plinks) {
148 sdata->u.mesh.accepting_plinks = free_plinks;
149 changed = BSS_CHANGED_BEACON;
150 }
151
152 return changed;
153 }
154
155 /*
156 * mesh_sta_cleanup - clean up any mesh sta state
157 *
158 * @sta: mesh sta to clean up.
159 */
160 void mesh_sta_cleanup(struct sta_info *sta)
161 {
162 struct ieee80211_sub_if_data *sdata = sta->sdata;
163 u32 changed = mesh_plink_deactivate(sta);
164
165 if (changed)
166 ieee80211_mbss_info_change_notify(sdata, changed);
167 }
168
169 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
170 {
171 int i;
172
173 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
174 if (!sdata->u.mesh.rmc)
175 return -ENOMEM;
176 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
177 for (i = 0; i < RMC_BUCKETS; i++)
178 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
179 return 0;
180 }
181
182 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
183 {
184 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
185 struct rmc_entry *p;
186 struct hlist_node *n;
187 int i;
188
189 if (!sdata->u.mesh.rmc)
190 return;
191
192 for (i = 0; i < RMC_BUCKETS; i++) {
193 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
194 hlist_del(&p->list);
195 kmem_cache_free(rm_cache, p);
196 }
197 }
198
199 kfree(rmc);
200 sdata->u.mesh.rmc = NULL;
201 }
202
203 /**
204 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
205 *
206 * @sdata: interface
207 * @sa: source address
208 * @mesh_hdr: mesh_header
209 *
210 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
211 *
212 * Checks using the source address and the mesh sequence number if we have
213 * received this frame lately. If the frame is not in the cache, it is added to
214 * it.
215 */
216 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
217 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
218 {
219 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
220 u32 seqnum = 0;
221 int entries = 0;
222 u8 idx;
223 struct rmc_entry *p;
224 struct hlist_node *n;
225
226 if (!rmc)
227 return -1;
228
229 /* Don't care about endianness since only match matters */
230 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
231 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
232 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
233 ++entries;
234 if (time_after(jiffies, p->exp_time) ||
235 entries == RMC_QUEUE_MAX_LEN) {
236 hlist_del(&p->list);
237 kmem_cache_free(rm_cache, p);
238 --entries;
239 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
240 return -1;
241 }
242
243 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
244 if (!p)
245 return 0;
246
247 p->seqnum = seqnum;
248 p->exp_time = jiffies + RMC_TIMEOUT;
249 memcpy(p->sa, sa, ETH_ALEN);
250 hlist_add_head(&p->list, &rmc->bucket[idx]);
251 return 0;
252 }
253
254 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
255 struct sk_buff *skb)
256 {
257 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
258 u8 *pos, neighbors;
259 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
260 bool is_connected_to_gate = ifmsh->num_gates > 0 ||
261 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
262 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
263 bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
264
265 if (skb_tailroom(skb) < 2 + meshconf_len)
266 return -ENOMEM;
267
268 pos = skb_put(skb, 2 + meshconf_len);
269 *pos++ = WLAN_EID_MESH_CONFIG;
270 *pos++ = meshconf_len;
271
272 /* save a pointer for quick updates in pre-tbtt */
273 ifmsh->meshconf_offset = pos - skb->data;
274
275 /* Active path selection protocol ID */
276 *pos++ = ifmsh->mesh_pp_id;
277 /* Active path selection metric ID */
278 *pos++ = ifmsh->mesh_pm_id;
279 /* Congestion control mode identifier */
280 *pos++ = ifmsh->mesh_cc_id;
281 /* Synchronization protocol identifier */
282 *pos++ = ifmsh->mesh_sp_id;
283 /* Authentication Protocol identifier */
284 *pos++ = ifmsh->mesh_auth_id;
285 /* Mesh Formation Info - number of neighbors */
286 neighbors = atomic_read(&ifmsh->estab_plinks);
287 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
288 *pos++ = (is_connected_to_as << 7) |
289 (neighbors << 1) |
290 is_connected_to_gate;
291 /* Mesh capability */
292 *pos = 0x00;
293 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
294 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
295 *pos |= ifmsh->accepting_plinks ?
296 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
297 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
298 *pos |= ifmsh->ps_peers_deep_sleep ?
299 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
300 return 0;
301 }
302
303 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
304 {
305 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
306 u8 *pos;
307
308 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
309 return -ENOMEM;
310
311 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
312 *pos++ = WLAN_EID_MESH_ID;
313 *pos++ = ifmsh->mesh_id_len;
314 if (ifmsh->mesh_id_len)
315 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
316
317 return 0;
318 }
319
320 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
321 struct sk_buff *skb)
322 {
323 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
324 u8 *pos;
325
326 /* see IEEE802.11-2012 13.14.6 */
327 if (ifmsh->ps_peers_light_sleep == 0 &&
328 ifmsh->ps_peers_deep_sleep == 0 &&
329 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
330 return 0;
331
332 if (skb_tailroom(skb) < 4)
333 return -ENOMEM;
334
335 pos = skb_put(skb, 2 + 2);
336 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
337 *pos++ = 2;
338 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
339
340 return 0;
341 }
342
343 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
344 struct sk_buff *skb)
345 {
346 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
347 u8 offset, len;
348 const u8 *data;
349
350 if (!ifmsh->ie || !ifmsh->ie_len)
351 return 0;
352
353 /* fast-forward to vendor IEs */
354 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
355
356 if (offset < ifmsh->ie_len) {
357 len = ifmsh->ie_len - offset;
358 data = ifmsh->ie + offset;
359 if (skb_tailroom(skb) < len)
360 return -ENOMEM;
361 skb_put_data(skb, data, len);
362 }
363
364 return 0;
365 }
366
367 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
368 {
369 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
370 u8 len = 0;
371 const u8 *data;
372
373 if (!ifmsh->ie || !ifmsh->ie_len)
374 return 0;
375
376 /* find RSN IE */
377 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
378 if (!data)
379 return 0;
380
381 len = data[1] + 2;
382
383 if (skb_tailroom(skb) < len)
384 return -ENOMEM;
385 skb_put_data(skb, data, len);
386
387 return 0;
388 }
389
390 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
391 struct sk_buff *skb)
392 {
393 struct ieee80211_chanctx_conf *chanctx_conf;
394 struct ieee80211_channel *chan;
395 u8 *pos;
396
397 if (skb_tailroom(skb) < 3)
398 return -ENOMEM;
399
400 rcu_read_lock();
401 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
402 if (WARN_ON(!chanctx_conf)) {
403 rcu_read_unlock();
404 return -EINVAL;
405 }
406 chan = chanctx_conf->def.chan;
407 rcu_read_unlock();
408
409 pos = skb_put(skb, 2 + 1);
410 *pos++ = WLAN_EID_DS_PARAMS;
411 *pos++ = 1;
412 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
413
414 return 0;
415 }
416
417 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
418 struct sk_buff *skb)
419 {
420 struct ieee80211_supported_band *sband;
421 u8 *pos;
422
423 sband = ieee80211_get_sband(sdata);
424 if (!sband)
425 return -EINVAL;
426
427 /* HT not allowed in 6 GHz */
428 if (sband->band == NL80211_BAND_6GHZ)
429 return 0;
430
431 if (!sband->ht_cap.ht_supported ||
432 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
433 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
434 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
435 return 0;
436
437 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
438 return -ENOMEM;
439
440 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
441 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
442
443 return 0;
444 }
445
446 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
447 struct sk_buff *skb)
448 {
449 struct ieee80211_local *local = sdata->local;
450 struct ieee80211_chanctx_conf *chanctx_conf;
451 struct ieee80211_channel *channel;
452 struct ieee80211_supported_band *sband;
453 struct ieee80211_sta_ht_cap *ht_cap;
454 u8 *pos;
455
456 rcu_read_lock();
457 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
458 if (WARN_ON(!chanctx_conf)) {
459 rcu_read_unlock();
460 return -EINVAL;
461 }
462 channel = chanctx_conf->def.chan;
463 rcu_read_unlock();
464
465 sband = local->hw.wiphy->bands[channel->band];
466 ht_cap = &sband->ht_cap;
467
468 /* HT not allowed in 6 GHz */
469 if (sband->band == NL80211_BAND_6GHZ)
470 return 0;
471
472 if (!ht_cap->ht_supported ||
473 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
474 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
475 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
476 return 0;
477
478 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
479 return -ENOMEM;
480
481 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
482 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
483 sdata->vif.bss_conf.ht_operation_mode,
484 false);
485
486 return 0;
487 }
488
489 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
490 struct sk_buff *skb)
491 {
492 struct ieee80211_supported_band *sband;
493 u8 *pos;
494
495 sband = ieee80211_get_sband(sdata);
496 if (!sband)
497 return -EINVAL;
498
499 /* VHT not allowed in 6 GHz */
500 if (sband->band == NL80211_BAND_6GHZ)
501 return 0;
502
503 if (!sband->vht_cap.vht_supported ||
504 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
505 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
506 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
507 return 0;
508
509 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
510 return -ENOMEM;
511
512 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
513 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
514
515 return 0;
516 }
517
518 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
519 struct sk_buff *skb)
520 {
521 struct ieee80211_local *local = sdata->local;
522 struct ieee80211_chanctx_conf *chanctx_conf;
523 struct ieee80211_channel *channel;
524 struct ieee80211_supported_band *sband;
525 struct ieee80211_sta_vht_cap *vht_cap;
526 u8 *pos;
527
528 rcu_read_lock();
529 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
530 if (WARN_ON(!chanctx_conf)) {
531 rcu_read_unlock();
532 return -EINVAL;
533 }
534 channel = chanctx_conf->def.chan;
535 rcu_read_unlock();
536
537 sband = local->hw.wiphy->bands[channel->band];
538 vht_cap = &sband->vht_cap;
539
540 /* VHT not allowed in 6 GHz */
541 if (sband->band == NL80211_BAND_6GHZ)
542 return 0;
543
544 if (!vht_cap->vht_supported ||
545 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
546 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
547 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
548 return 0;
549
550 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
551 return -ENOMEM;
552
553 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
554 ieee80211_ie_build_vht_oper(pos, vht_cap,
555 &sdata->vif.bss_conf.chandef);
556
557 return 0;
558 }
559
560 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
561 struct sk_buff *skb, u8 ie_len)
562 {
563 const struct ieee80211_sta_he_cap *he_cap;
564 struct ieee80211_supported_band *sband;
565 u8 *pos;
566
567 sband = ieee80211_get_sband(sdata);
568 if (!sband)
569 return -EINVAL;
570
571 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
572
573 if (!he_cap ||
574 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
575 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
576 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
577 return 0;
578
579 if (skb_tailroom(skb) < ie_len)
580 return -ENOMEM;
581
582 pos = skb_put(skb, ie_len);
583 ieee80211_ie_build_he_cap(pos, he_cap, pos + ie_len);
584
585 return 0;
586 }
587
588 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
589 struct sk_buff *skb)
590 {
591 const struct ieee80211_sta_he_cap *he_cap;
592 struct ieee80211_supported_band *sband;
593 u32 len;
594 u8 *pos;
595
596 sband = ieee80211_get_sband(sdata);
597 if (!sband)
598 return -EINVAL;
599
600 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
601 if (!he_cap ||
602 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
603 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
604 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
605 return 0;
606
607 len = 2 + 1 + sizeof(struct ieee80211_he_operation);
608 if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ)
609 len += sizeof(struct ieee80211_he_6ghz_oper);
610
611 if (skb_tailroom(skb) < len)
612 return -ENOMEM;
613
614 pos = skb_put(skb, len);
615 ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef);
616
617 return 0;
618 }
619
620 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
621 struct sk_buff *skb)
622 {
623 struct ieee80211_supported_band *sband;
624 const struct ieee80211_sband_iftype_data *iftd;
625
626 sband = ieee80211_get_sband(sdata);
627 if (!sband)
628 return -EINVAL;
629
630 iftd = ieee80211_get_sband_iftype_data(sband,
631 NL80211_IFTYPE_MESH_POINT);
632 /* The device doesn't support HE in mesh mode or at all */
633 if (!iftd)
634 return 0;
635
636 ieee80211_ie_build_he_6ghz_cap(sdata, skb);
637 return 0;
638 }
639
640 static void ieee80211_mesh_path_timer(struct timer_list *t)
641 {
642 struct ieee80211_sub_if_data *sdata =
643 from_timer(sdata, t, u.mesh.mesh_path_timer);
644
645 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
646 }
647
648 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
649 {
650 struct ieee80211_sub_if_data *sdata =
651 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
652 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
653
654 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
655
656 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
657 }
658
659 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
660 {
661 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
662 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
663 else {
664 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
665 /* stop running timer */
666 del_timer_sync(&ifmsh->mesh_path_root_timer);
667 }
668 }
669
670 static void
671 ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
672 u8 *ie, u8 ie_len)
673 {
674 struct ieee80211_supported_band *sband;
675 const u8 *cap;
676 const struct ieee80211_he_operation *he_oper = NULL;
677
678 sband = ieee80211_get_sband(sdata);
679 if (!sband)
680 return;
681
682 if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) ||
683 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
684 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
685 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
686 return;
687
688 sdata->vif.bss_conf.he_support = true;
689
690 cap = cfg80211_find_ext_ie(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
691 if (cap && cap[1] >= ieee80211_he_oper_size(&cap[3]))
692 he_oper = (void *)(cap + 3);
693
694 if (he_oper)
695 sdata->vif.bss_conf.he_oper.params =
696 __le32_to_cpu(he_oper->he_oper_params);
697 }
698
699 /**
700 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
701 * @hdr: 802.11 frame header
702 * @fc: frame control field
703 * @meshda: destination address in the mesh
704 * @meshsa: source address in the mesh. Same as TA, as frame is
705 * locally originated.
706 *
707 * Return the length of the 802.11 (does not include a mesh control header)
708 */
709 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
710 const u8 *meshda, const u8 *meshsa)
711 {
712 if (is_multicast_ether_addr(meshda)) {
713 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
714 /* DA TA SA */
715 memcpy(hdr->addr1, meshda, ETH_ALEN);
716 memcpy(hdr->addr2, meshsa, ETH_ALEN);
717 memcpy(hdr->addr3, meshsa, ETH_ALEN);
718 return 24;
719 } else {
720 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
721 /* RA TA DA SA */
722 eth_zero_addr(hdr->addr1); /* RA is resolved later */
723 memcpy(hdr->addr2, meshsa, ETH_ALEN);
724 memcpy(hdr->addr3, meshda, ETH_ALEN);
725 memcpy(hdr->addr4, meshsa, ETH_ALEN);
726 return 30;
727 }
728 }
729
730 /**
731 * ieee80211_new_mesh_header - create a new mesh header
732 * @sdata: mesh interface to be used
733 * @meshhdr: uninitialized mesh header
734 * @addr4or5: 1st address in the ae header, which may correspond to address 4
735 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
736 * be NULL.
737 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
738 * mesh frame
739 *
740 * Return the header length.
741 */
742 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
743 struct ieee80211s_hdr *meshhdr,
744 const char *addr4or5, const char *addr6)
745 {
746 if (WARN_ON(!addr4or5 && addr6))
747 return 0;
748
749 memset(meshhdr, 0, sizeof(*meshhdr));
750
751 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
752
753 /* FIXME: racy -- TX on multiple queues can be concurrent */
754 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
755 sdata->u.mesh.mesh_seqnum++;
756
757 if (addr4or5 && !addr6) {
758 meshhdr->flags |= MESH_FLAGS_AE_A4;
759 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
760 return 2 * ETH_ALEN;
761 } else if (addr4or5 && addr6) {
762 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
763 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
764 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
765 return 3 * ETH_ALEN;
766 }
767
768 return ETH_ALEN;
769 }
770
771 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
772 {
773 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
774 u32 changed;
775
776 if (ifmsh->mshcfg.plink_timeout > 0)
777 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
778 mesh_path_expire(sdata);
779
780 changed = mesh_accept_plinks_update(sdata);
781 ieee80211_mbss_info_change_notify(sdata, changed);
782
783 mod_timer(&ifmsh->housekeeping_timer,
784 round_jiffies(jiffies +
785 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
786 }
787
788 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
789 {
790 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
791 u32 interval;
792
793 mesh_path_tx_root_frame(sdata);
794
795 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
796 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
797 else
798 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
799
800 mod_timer(&ifmsh->mesh_path_root_timer,
801 round_jiffies(TU_TO_EXP_TIME(interval)));
802 }
803
804 static int
805 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
806 {
807 struct beacon_data *bcn;
808 int head_len, tail_len;
809 struct sk_buff *skb;
810 struct ieee80211_mgmt *mgmt;
811 struct ieee80211_chanctx_conf *chanctx_conf;
812 struct mesh_csa_settings *csa;
813 enum nl80211_band band;
814 u8 ie_len_he_cap;
815 u8 *pos;
816 struct ieee80211_sub_if_data *sdata;
817 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
818
819 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
820 rcu_read_lock();
821 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
822 band = chanctx_conf->def.chan->band;
823 rcu_read_unlock();
824
825 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
826 NL80211_IFTYPE_MESH_POINT);
827 head_len = hdr_len +
828 2 + /* NULL SSID */
829 /* Channel Switch Announcement */
830 2 + sizeof(struct ieee80211_channel_sw_ie) +
831 /* Mesh Channel Switch Parameters */
832 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
833 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
834 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
835 2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
836 2 + 8 + /* supported rates */
837 2 + 3; /* DS params */
838 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
839 2 + sizeof(struct ieee80211_ht_cap) +
840 2 + sizeof(struct ieee80211_ht_operation) +
841 2 + ifmsh->mesh_id_len +
842 2 + sizeof(struct ieee80211_meshconf_ie) +
843 2 + sizeof(__le16) + /* awake window */
844 2 + sizeof(struct ieee80211_vht_cap) +
845 2 + sizeof(struct ieee80211_vht_operation) +
846 ie_len_he_cap +
847 2 + 1 + sizeof(struct ieee80211_he_operation) +
848 sizeof(struct ieee80211_he_6ghz_oper) +
849 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
850 ifmsh->ie_len;
851
852 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
853 /* need an skb for IE builders to operate on */
854 skb = dev_alloc_skb(max(head_len, tail_len));
855
856 if (!bcn || !skb)
857 goto out_free;
858
859 /*
860 * pointers go into the block we allocated,
861 * memory is | beacon_data | head | tail |
862 */
863 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
864
865 /* fill in the head */
866 mgmt = skb_put_zero(skb, hdr_len);
867 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
868 IEEE80211_STYPE_BEACON);
869 eth_broadcast_addr(mgmt->da);
870 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
871 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
872 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
873 mgmt->u.beacon.beacon_int =
874 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
875 mgmt->u.beacon.capab_info |= cpu_to_le16(
876 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
877
878 pos = skb_put(skb, 2);
879 *pos++ = WLAN_EID_SSID;
880 *pos++ = 0x0;
881
882 rcu_read_lock();
883 csa = rcu_dereference(ifmsh->csa);
884 if (csa) {
885 enum nl80211_channel_type ct;
886 struct cfg80211_chan_def *chandef;
887 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
888 2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
889
890 pos = skb_put_zero(skb, ie_len);
891 *pos++ = WLAN_EID_CHANNEL_SWITCH;
892 *pos++ = 3;
893 *pos++ = 0x0;
894 *pos++ = ieee80211_frequency_to_channel(
895 csa->settings.chandef.chan->center_freq);
896 bcn->cntdwn_current_counter = csa->settings.count;
897 bcn->cntdwn_counter_offsets[0] = hdr_len + 6;
898 *pos++ = csa->settings.count;
899 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
900 *pos++ = 6;
901 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
902 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
903 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
904 } else {
905 *pos++ = ifmsh->chsw_ttl;
906 }
907 *pos++ |= csa->settings.block_tx ?
908 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
909 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
910 pos += 2;
911 put_unaligned_le16(ifmsh->pre_value, pos);
912 pos += 2;
913
914 switch (csa->settings.chandef.width) {
915 case NL80211_CHAN_WIDTH_40:
916 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
917 pos = skb_put_zero(skb, ie_len);
918
919 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
920 *pos++ = 1; /* len */
921 ct = cfg80211_get_chandef_type(&csa->settings.chandef);
922 if (ct == NL80211_CHAN_HT40PLUS)
923 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
924 else
925 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
926 break;
927 case NL80211_CHAN_WIDTH_80:
928 case NL80211_CHAN_WIDTH_80P80:
929 case NL80211_CHAN_WIDTH_160:
930 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
931 ie_len = 2 + 2 +
932 sizeof(struct ieee80211_wide_bw_chansw_ie);
933 pos = skb_put_zero(skb, ie_len);
934
935 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
936 *pos++ = 5; /* len */
937 /* put sub IE */
938 chandef = &csa->settings.chandef;
939 ieee80211_ie_build_wide_bw_cs(pos, chandef);
940 break;
941 default:
942 break;
943 }
944 }
945 rcu_read_unlock();
946
947 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
948 mesh_add_ds_params_ie(sdata, skb))
949 goto out_free;
950
951 bcn->head_len = skb->len;
952 memcpy(bcn->head, skb->data, bcn->head_len);
953
954 /* now the tail */
955 skb_trim(skb, 0);
956 bcn->tail = bcn->head + bcn->head_len;
957
958 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
959 mesh_add_rsn_ie(sdata, skb) ||
960 mesh_add_ht_cap_ie(sdata, skb) ||
961 mesh_add_ht_oper_ie(sdata, skb) ||
962 mesh_add_meshid_ie(sdata, skb) ||
963 mesh_add_meshconf_ie(sdata, skb) ||
964 mesh_add_awake_window_ie(sdata, skb) ||
965 mesh_add_vht_cap_ie(sdata, skb) ||
966 mesh_add_vht_oper_ie(sdata, skb) ||
967 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
968 mesh_add_he_oper_ie(sdata, skb) ||
969 mesh_add_he_6ghz_cap_ie(sdata, skb) ||
970 mesh_add_vendor_ies(sdata, skb))
971 goto out_free;
972
973 bcn->tail_len = skb->len;
974 memcpy(bcn->tail, skb->data, bcn->tail_len);
975 ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len);
976 bcn->meshconf = (struct ieee80211_meshconf_ie *)
977 (bcn->tail + ifmsh->meshconf_offset);
978
979 dev_kfree_skb(skb);
980 rcu_assign_pointer(ifmsh->beacon, bcn);
981 return 0;
982 out_free:
983 kfree(bcn);
984 dev_kfree_skb(skb);
985 return -ENOMEM;
986 }
987
988 static int
989 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
990 {
991 struct beacon_data *old_bcn;
992 int ret;
993
994 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
995 lockdep_is_held(&sdata->wdev.mtx));
996 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
997 if (ret)
998 /* just reuse old beacon */
999 return ret;
1000
1001 if (old_bcn)
1002 kfree_rcu(old_bcn, rcu_head);
1003 return 0;
1004 }
1005
1006 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1007 u32 changed)
1008 {
1009 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1010 unsigned long bits = changed;
1011 u32 bit;
1012
1013 if (!bits)
1014 return;
1015
1016 /* if we race with running work, worst case this work becomes a noop */
1017 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
1018 set_bit(bit, &ifmsh->mbss_changed);
1019 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
1020 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1021 }
1022
1023 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
1024 {
1025 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1026 struct ieee80211_local *local = sdata->local;
1027 u32 changed = BSS_CHANGED_BEACON |
1028 BSS_CHANGED_BEACON_ENABLED |
1029 BSS_CHANGED_HT |
1030 BSS_CHANGED_BASIC_RATES |
1031 BSS_CHANGED_BEACON_INT |
1032 BSS_CHANGED_MCAST_RATE;
1033
1034 local->fif_other_bss++;
1035 /* mesh ifaces must set allmulti to forward mcast traffic */
1036 atomic_inc(&local->iff_allmultis);
1037 ieee80211_configure_filter(local);
1038
1039 ifmsh->mesh_cc_id = 0; /* Disabled */
1040 /* register sync ops from extensible synchronization framework */
1041 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1042 ifmsh->sync_offset_clockdrift_max = 0;
1043 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1044 ieee80211_mesh_root_setup(ifmsh);
1045 ieee80211_queue_work(&local->hw, &sdata->work);
1046 sdata->vif.bss_conf.ht_operation_mode =
1047 ifmsh->mshcfg.ht_opmode;
1048 sdata->vif.bss_conf.enable_beacon = true;
1049
1050 changed |= ieee80211_mps_local_status_update(sdata);
1051
1052 if (ieee80211_mesh_build_beacon(ifmsh)) {
1053 ieee80211_stop_mesh(sdata);
1054 return -ENOMEM;
1055 }
1056
1057 ieee80211_recalc_dtim(local, sdata);
1058 ieee80211_bss_info_change_notify(sdata, changed);
1059
1060 netif_carrier_on(sdata->dev);
1061 return 0;
1062 }
1063
1064 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1065 {
1066 struct ieee80211_local *local = sdata->local;
1067 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1068 struct beacon_data *bcn;
1069
1070 netif_carrier_off(sdata->dev);
1071
1072 /* flush STAs and mpaths on this iface */
1073 sta_info_flush(sdata);
1074 ieee80211_free_keys(sdata, true);
1075 mesh_path_flush_by_iface(sdata);
1076
1077 /* stop the beacon */
1078 ifmsh->mesh_id_len = 0;
1079 sdata->vif.bss_conf.enable_beacon = false;
1080 sdata->beacon_rate_set = false;
1081 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1082 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
1083
1084 /* remove beacon */
1085 bcn = rcu_dereference_protected(ifmsh->beacon,
1086 lockdep_is_held(&sdata->wdev.mtx));
1087 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1088 kfree_rcu(bcn, rcu_head);
1089
1090 /* free all potentially still buffered group-addressed frames */
1091 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1092 skb_queue_purge(&ifmsh->ps.bc_buf);
1093
1094 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1095 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1096 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1097
1098 /* clear any mesh work (for next join) we may have accrued */
1099 ifmsh->wrkq_flags = 0;
1100 ifmsh->mbss_changed = 0;
1101
1102 local->fif_other_bss--;
1103 atomic_dec(&local->iff_allmultis);
1104 ieee80211_configure_filter(local);
1105 }
1106
1107 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1108 {
1109 int err;
1110
1111 /* if the current channel is a DFS channel, mark the channel as
1112 * unavailable.
1113 */
1114 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1115 &sdata->vif.bss_conf.chandef,
1116 NL80211_IFTYPE_MESH_POINT);
1117 if (err > 0)
1118 cfg80211_radar_event(sdata->local->hw.wiphy,
1119 &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1120 }
1121
1122 static bool
1123 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1124 struct ieee802_11_elems *elems, bool beacon)
1125 {
1126 struct cfg80211_csa_settings params;
1127 struct ieee80211_csa_ie csa_ie;
1128 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1129 struct ieee80211_supported_band *sband;
1130 int err;
1131 u32 sta_flags, vht_cap_info = 0;
1132
1133 sdata_assert_lock(sdata);
1134
1135 sband = ieee80211_get_sband(sdata);
1136 if (!sband)
1137 return false;
1138
1139 sta_flags = 0;
1140 switch (sdata->vif.bss_conf.chandef.width) {
1141 case NL80211_CHAN_WIDTH_20_NOHT:
1142 sta_flags |= IEEE80211_STA_DISABLE_HT;
1143 fallthrough;
1144 case NL80211_CHAN_WIDTH_20:
1145 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
1146 fallthrough;
1147 case NL80211_CHAN_WIDTH_40:
1148 sta_flags |= IEEE80211_STA_DISABLE_VHT;
1149 break;
1150 default:
1151 break;
1152 }
1153
1154 if (elems->vht_cap_elem)
1155 vht_cap_info =
1156 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1157
1158 memset(&params, 0, sizeof(params));
1159 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1160 vht_cap_info,
1161 sta_flags, sdata->vif.addr,
1162 &csa_ie);
1163 if (err < 0)
1164 return false;
1165 if (err)
1166 return false;
1167
1168 /* Mark the channel unavailable if the reason for the switch is
1169 * regulatory.
1170 */
1171 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1172 ieee80211_mesh_csa_mark_radar(sdata);
1173
1174 params.chandef = csa_ie.chandef;
1175 params.count = csa_ie.count;
1176
1177 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1178 IEEE80211_CHAN_DISABLED) ||
1179 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1180 NL80211_IFTYPE_MESH_POINT)) {
1181 sdata_info(sdata,
1182 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1183 sdata->vif.addr,
1184 params.chandef.chan->center_freq,
1185 params.chandef.width,
1186 params.chandef.center_freq1,
1187 params.chandef.center_freq2);
1188 return false;
1189 }
1190
1191 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1192 &params.chandef,
1193 NL80211_IFTYPE_MESH_POINT);
1194 if (err < 0)
1195 return false;
1196 if (err > 0 && !ifmsh->userspace_handles_dfs) {
1197 sdata_info(sdata,
1198 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1199 sdata->vif.addr,
1200 params.chandef.chan->center_freq,
1201 params.chandef.width,
1202 params.chandef.center_freq1,
1203 params.chandef.center_freq2);
1204 return false;
1205 }
1206
1207 params.radar_required = err;
1208
1209 if (cfg80211_chandef_identical(&params.chandef,
1210 &sdata->vif.bss_conf.chandef)) {
1211 mcsa_dbg(sdata,
1212 "received csa with an identical chandef, ignoring\n");
1213 return true;
1214 }
1215
1216 mcsa_dbg(sdata,
1217 "received channel switch announcement to go to channel %d MHz\n",
1218 params.chandef.chan->center_freq);
1219
1220 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1221 if (beacon) {
1222 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1223 if (ifmsh->pre_value >= csa_ie.pre_value)
1224 return false;
1225 ifmsh->pre_value = csa_ie.pre_value;
1226 }
1227
1228 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1229 return false;
1230
1231 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1232
1233 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1234 &params) < 0)
1235 return false;
1236
1237 return true;
1238 }
1239
1240 static void
1241 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1242 struct ieee80211_mgmt *mgmt, size_t len)
1243 {
1244 struct ieee80211_local *local = sdata->local;
1245 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1246 struct sk_buff *presp;
1247 struct beacon_data *bcn;
1248 struct ieee80211_mgmt *hdr;
1249 struct ieee802_11_elems elems;
1250 size_t baselen;
1251 u8 *pos;
1252
1253 pos = mgmt->u.probe_req.variable;
1254 baselen = (u8 *) pos - (u8 *) mgmt;
1255 if (baselen > len)
1256 return;
1257
1258 ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid,
1259 NULL);
1260
1261 if (!elems.mesh_id)
1262 return;
1263
1264 /* 802.11-2012 10.1.4.3.2 */
1265 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1266 !is_broadcast_ether_addr(mgmt->da)) ||
1267 elems.ssid_len != 0)
1268 return;
1269
1270 if (elems.mesh_id_len != 0 &&
1271 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1272 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1273 return;
1274
1275 rcu_read_lock();
1276 bcn = rcu_dereference(ifmsh->beacon);
1277
1278 if (!bcn)
1279 goto out;
1280
1281 presp = dev_alloc_skb(local->tx_headroom +
1282 bcn->head_len + bcn->tail_len);
1283 if (!presp)
1284 goto out;
1285
1286 skb_reserve(presp, local->tx_headroom);
1287 skb_put_data(presp, bcn->head, bcn->head_len);
1288 skb_put_data(presp, bcn->tail, bcn->tail_len);
1289 hdr = (struct ieee80211_mgmt *) presp->data;
1290 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1291 IEEE80211_STYPE_PROBE_RESP);
1292 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1293 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1294 ieee80211_tx_skb(sdata, presp);
1295 out:
1296 rcu_read_unlock();
1297 }
1298
1299 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1300 u16 stype,
1301 struct ieee80211_mgmt *mgmt,
1302 size_t len,
1303 struct ieee80211_rx_status *rx_status)
1304 {
1305 struct ieee80211_local *local = sdata->local;
1306 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1307 struct ieee802_11_elems elems;
1308 struct ieee80211_channel *channel;
1309 size_t baselen;
1310 int freq;
1311 enum nl80211_band band = rx_status->band;
1312
1313 /* ignore ProbeResp to foreign address */
1314 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1315 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1316 return;
1317
1318 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1319 if (baselen > len)
1320 return;
1321
1322 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1323 false, &elems, mgmt->bssid, NULL);
1324
1325 /* ignore non-mesh or secure / unsecure mismatch */
1326 if ((!elems.mesh_id || !elems.mesh_config) ||
1327 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1328 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1329 return;
1330
1331 if (elems.ds_params)
1332 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1333 else
1334 freq = rx_status->freq;
1335
1336 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1337
1338 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1339 return;
1340
1341 if (mesh_matches_local(sdata, &elems)) {
1342 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1343 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1344 if (!sdata->u.mesh.user_mpm ||
1345 sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1346 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1347 mesh_neighbour_update(sdata, mgmt->sa, &elems,
1348 rx_status);
1349
1350 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1351 !sdata->vif.csa_active)
1352 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1353 }
1354
1355 if (ifmsh->sync_ops)
1356 ifmsh->sync_ops->rx_bcn_presp(sdata,
1357 stype, mgmt, &elems, rx_status);
1358 }
1359
1360 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1361 {
1362 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1363 struct mesh_csa_settings *tmp_csa_settings;
1364 int ret = 0;
1365 int changed = 0;
1366
1367 /* Reset the TTL value and Initiator flag */
1368 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1369 ifmsh->chsw_ttl = 0;
1370
1371 /* Remove the CSA and MCSP elements from the beacon */
1372 tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
1373 lockdep_is_held(&sdata->wdev.mtx));
1374 RCU_INIT_POINTER(ifmsh->csa, NULL);
1375 if (tmp_csa_settings)
1376 kfree_rcu(tmp_csa_settings, rcu_head);
1377 ret = ieee80211_mesh_rebuild_beacon(sdata);
1378 if (ret)
1379 return -EINVAL;
1380
1381 changed |= BSS_CHANGED_BEACON;
1382
1383 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1384 sdata->vif.bss_conf.chandef.chan->center_freq);
1385 return changed;
1386 }
1387
1388 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1389 struct cfg80211_csa_settings *csa_settings)
1390 {
1391 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1392 struct mesh_csa_settings *tmp_csa_settings;
1393 int ret = 0;
1394
1395 lockdep_assert_held(&sdata->wdev.mtx);
1396
1397 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1398 GFP_ATOMIC);
1399 if (!tmp_csa_settings)
1400 return -ENOMEM;
1401
1402 memcpy(&tmp_csa_settings->settings, csa_settings,
1403 sizeof(struct cfg80211_csa_settings));
1404
1405 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1406
1407 ret = ieee80211_mesh_rebuild_beacon(sdata);
1408 if (ret) {
1409 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1410 RCU_INIT_POINTER(ifmsh->csa, NULL);
1411 kfree_rcu(tmp_csa_settings, rcu_head);
1412 return ret;
1413 }
1414
1415 return BSS_CHANGED_BEACON;
1416 }
1417
1418 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1419 struct ieee80211_mgmt *mgmt, size_t len,
1420 struct ieee802_11_elems *elems)
1421 {
1422 struct ieee80211_mgmt *mgmt_fwd;
1423 struct sk_buff *skb;
1424 struct ieee80211_local *local = sdata->local;
1425
1426 skb = dev_alloc_skb(local->tx_headroom + len);
1427 if (!skb)
1428 return -ENOMEM;
1429 skb_reserve(skb, local->tx_headroom);
1430 mgmt_fwd = skb_put(skb, len);
1431
1432 elems->mesh_chansw_params_ie->mesh_ttl--;
1433 elems->mesh_chansw_params_ie->mesh_flags &=
1434 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1435
1436 memcpy(mgmt_fwd, mgmt, len);
1437 eth_broadcast_addr(mgmt_fwd->da);
1438 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1439 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1440
1441 ieee80211_tx_skb(sdata, skb);
1442 return 0;
1443 }
1444
1445 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1446 struct ieee80211_mgmt *mgmt, size_t len)
1447 {
1448 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1449 struct ieee802_11_elems elems;
1450 u16 pre_value;
1451 bool fwd_csa = true;
1452 size_t baselen;
1453 u8 *pos;
1454
1455 if (mgmt->u.action.u.measurement.action_code !=
1456 WLAN_ACTION_SPCT_CHL_SWITCH)
1457 return;
1458
1459 pos = mgmt->u.action.u.chan_switch.variable;
1460 baselen = offsetof(struct ieee80211_mgmt,
1461 u.action.u.chan_switch.variable);
1462 ieee802_11_parse_elems(pos, len - baselen, true, &elems,
1463 mgmt->bssid, NULL);
1464
1465 if (!mesh_matches_local(sdata, &elems))
1466 return;
1467
1468 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1469 if (!--ifmsh->chsw_ttl)
1470 fwd_csa = false;
1471
1472 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1473 if (ifmsh->pre_value >= pre_value)
1474 return;
1475
1476 ifmsh->pre_value = pre_value;
1477
1478 if (!sdata->vif.csa_active &&
1479 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1480 mcsa_dbg(sdata, "Failed to process CSA action frame");
1481 return;
1482 }
1483
1484 /* forward or re-broadcast the CSA frame */
1485 if (fwd_csa) {
1486 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0)
1487 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1488 }
1489 }
1490
1491 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1492 struct ieee80211_mgmt *mgmt,
1493 size_t len,
1494 struct ieee80211_rx_status *rx_status)
1495 {
1496 switch (mgmt->u.action.category) {
1497 case WLAN_CATEGORY_SELF_PROTECTED:
1498 switch (mgmt->u.action.u.self_prot.action_code) {
1499 case WLAN_SP_MESH_PEERING_OPEN:
1500 case WLAN_SP_MESH_PEERING_CLOSE:
1501 case WLAN_SP_MESH_PEERING_CONFIRM:
1502 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1503 break;
1504 }
1505 break;
1506 case WLAN_CATEGORY_MESH_ACTION:
1507 if (mesh_action_is_path_sel(mgmt))
1508 mesh_rx_path_sel_frame(sdata, mgmt, len);
1509 break;
1510 case WLAN_CATEGORY_SPECTRUM_MGMT:
1511 mesh_rx_csa_frame(sdata, mgmt, len);
1512 break;
1513 }
1514 }
1515
1516 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1517 struct sk_buff *skb)
1518 {
1519 struct ieee80211_rx_status *rx_status;
1520 struct ieee80211_mgmt *mgmt;
1521 u16 stype;
1522
1523 sdata_lock(sdata);
1524
1525 /* mesh already went down */
1526 if (!sdata->u.mesh.mesh_id_len)
1527 goto out;
1528
1529 rx_status = IEEE80211_SKB_RXCB(skb);
1530 mgmt = (struct ieee80211_mgmt *) skb->data;
1531 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1532
1533 switch (stype) {
1534 case IEEE80211_STYPE_PROBE_RESP:
1535 case IEEE80211_STYPE_BEACON:
1536 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1537 rx_status);
1538 break;
1539 case IEEE80211_STYPE_PROBE_REQ:
1540 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1541 break;
1542 case IEEE80211_STYPE_ACTION:
1543 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1544 break;
1545 }
1546 out:
1547 sdata_unlock(sdata);
1548 }
1549
1550 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1551 {
1552 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1553 u32 bit, changed = 0;
1554
1555 for_each_set_bit(bit, &ifmsh->mbss_changed,
1556 sizeof(changed) * BITS_PER_BYTE) {
1557 clear_bit(bit, &ifmsh->mbss_changed);
1558 changed |= BIT(bit);
1559 }
1560
1561 if (sdata->vif.bss_conf.enable_beacon &&
1562 (changed & (BSS_CHANGED_BEACON |
1563 BSS_CHANGED_HT |
1564 BSS_CHANGED_BASIC_RATES |
1565 BSS_CHANGED_BEACON_INT)))
1566 if (ieee80211_mesh_rebuild_beacon(sdata))
1567 return;
1568
1569 ieee80211_bss_info_change_notify(sdata, changed);
1570 }
1571
1572 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1573 {
1574 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1575
1576 sdata_lock(sdata);
1577
1578 /* mesh already went down */
1579 if (!sdata->u.mesh.mesh_id_len)
1580 goto out;
1581
1582 if (ifmsh->preq_queue_len &&
1583 time_after(jiffies,
1584 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1585 mesh_path_start_discovery(sdata);
1586
1587 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1588 ieee80211_mesh_housekeeping(sdata);
1589
1590 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1591 ieee80211_mesh_rootpath(sdata);
1592
1593 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1594 mesh_sync_adjust_tsf(sdata);
1595
1596 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1597 mesh_bss_info_changed(sdata);
1598 out:
1599 sdata_unlock(sdata);
1600 }
1601
1602
1603 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1604 {
1605 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1606 static u8 zero_addr[ETH_ALEN] = {};
1607
1608 timer_setup(&ifmsh->housekeeping_timer,
1609 ieee80211_mesh_housekeeping_timer, 0);
1610
1611 ifmsh->accepting_plinks = true;
1612 atomic_set(&ifmsh->mpaths, 0);
1613 mesh_rmc_init(sdata);
1614 ifmsh->last_preq = jiffies;
1615 ifmsh->next_perr = jiffies;
1616 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1617 /* Allocate all mesh structures when creating the first mesh interface. */
1618 if (!mesh_allocated)
1619 ieee80211s_init();
1620
1621 mesh_pathtbl_init(sdata);
1622
1623 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1624 timer_setup(&ifmsh->mesh_path_root_timer,
1625 ieee80211_mesh_path_root_timer, 0);
1626 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1627 skb_queue_head_init(&ifmsh->ps.bc_buf);
1628 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1629 spin_lock_init(&ifmsh->sync_offset_lock);
1630 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1631
1632 sdata->vif.bss_conf.bssid = zero_addr;
1633 }
1634
1635 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1636 {
1637 mesh_rmc_free(sdata);
1638 mesh_pathtbl_unregister(sdata);
1639 }
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