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
mesh_action_is_path_sel(struct ieee80211_mgmt * mgmt)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
ieee80211s_init(void)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
ieee80211s_stop(void)31 void ieee80211s_stop(void)
32 {
33 if (!mesh_allocated)
34 return;
35 kmem_cache_destroy(rm_cache);
36 }
37
ieee80211_mesh_housekeeping_timer(struct timer_list * t)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 */
mesh_matches_local(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * ie)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 */
mesh_peer_accepts_plinks(struct ieee802_11_elems * ie)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 */
mesh_accept_plinks_update(struct ieee80211_sub_if_data * sdata)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 */
mesh_sta_cleanup(struct sta_info * sta)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
mesh_rmc_init(struct ieee80211_sub_if_data * sdata)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
mesh_rmc_free(struct ieee80211_sub_if_data * sdata)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 */
mesh_rmc_check(struct ieee80211_sub_if_data * sdata,const u8 * sa,struct ieee80211s_hdr * mesh_hdr)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
mesh_add_meshconf_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_meshid_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_awake_window_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_vendor_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_rsn_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_ds_params_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_ht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_ht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_vht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_vht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_he_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u8 ie_len)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
mesh_add_he_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)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
ieee80211_mesh_path_timer(struct timer_list * t)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
ieee80211_mesh_path_root_timer(struct timer_list * t)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
ieee80211_mesh_root_setup(struct ieee80211_if_mesh * ifmsh)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 /**
671 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
672 * @hdr: 802.11 frame header
673 * @fc: frame control field
674 * @meshda: destination address in the mesh
675 * @meshsa: source address in the mesh. Same as TA, as frame is
676 * locally originated.
677 *
678 * Return the length of the 802.11 (does not include a mesh control header)
679 */
ieee80211_fill_mesh_addresses(struct ieee80211_hdr * hdr,__le16 * fc,const u8 * meshda,const u8 * meshsa)680 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
681 const u8 *meshda, const u8 *meshsa)
682 {
683 if (is_multicast_ether_addr(meshda)) {
684 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
685 /* DA TA SA */
686 memcpy(hdr->addr1, meshda, ETH_ALEN);
687 memcpy(hdr->addr2, meshsa, ETH_ALEN);
688 memcpy(hdr->addr3, meshsa, ETH_ALEN);
689 return 24;
690 } else {
691 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
692 /* RA TA DA SA */
693 eth_zero_addr(hdr->addr1); /* RA is resolved later */
694 memcpy(hdr->addr2, meshsa, ETH_ALEN);
695 memcpy(hdr->addr3, meshda, ETH_ALEN);
696 memcpy(hdr->addr4, meshsa, ETH_ALEN);
697 return 30;
698 }
699 }
700
701 /**
702 * ieee80211_new_mesh_header - create a new mesh header
703 * @sdata: mesh interface to be used
704 * @meshhdr: uninitialized mesh header
705 * @addr4or5: 1st address in the ae header, which may correspond to address 4
706 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
707 * be NULL.
708 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
709 * mesh frame
710 *
711 * Return the header length.
712 */
ieee80211_new_mesh_header(struct ieee80211_sub_if_data * sdata,struct ieee80211s_hdr * meshhdr,const char * addr4or5,const char * addr6)713 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
714 struct ieee80211s_hdr *meshhdr,
715 const char *addr4or5, const char *addr6)
716 {
717 if (WARN_ON(!addr4or5 && addr6))
718 return 0;
719
720 memset(meshhdr, 0, sizeof(*meshhdr));
721
722 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
723
724 /* FIXME: racy -- TX on multiple queues can be concurrent */
725 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
726 sdata->u.mesh.mesh_seqnum++;
727
728 if (addr4or5 && !addr6) {
729 meshhdr->flags |= MESH_FLAGS_AE_A4;
730 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
731 return 2 * ETH_ALEN;
732 } else if (addr4or5 && addr6) {
733 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
734 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
735 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
736 return 3 * ETH_ALEN;
737 }
738
739 return ETH_ALEN;
740 }
741
ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data * sdata)742 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
743 {
744 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
745 u32 changed;
746
747 if (ifmsh->mshcfg.plink_timeout > 0)
748 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
749 mesh_path_expire(sdata);
750
751 changed = mesh_accept_plinks_update(sdata);
752 ieee80211_mbss_info_change_notify(sdata, changed);
753
754 mod_timer(&ifmsh->housekeeping_timer,
755 round_jiffies(jiffies +
756 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
757 }
758
ieee80211_mesh_rootpath(struct ieee80211_sub_if_data * sdata)759 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
760 {
761 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
762 u32 interval;
763
764 mesh_path_tx_root_frame(sdata);
765
766 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
767 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
768 else
769 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
770
771 mod_timer(&ifmsh->mesh_path_root_timer,
772 round_jiffies(TU_TO_EXP_TIME(interval)));
773 }
774
775 static int
ieee80211_mesh_build_beacon(struct ieee80211_if_mesh * ifmsh)776 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
777 {
778 struct beacon_data *bcn;
779 int head_len, tail_len;
780 struct sk_buff *skb;
781 struct ieee80211_mgmt *mgmt;
782 struct ieee80211_chanctx_conf *chanctx_conf;
783 struct mesh_csa_settings *csa;
784 enum nl80211_band band;
785 u8 ie_len_he_cap;
786 u8 *pos;
787 struct ieee80211_sub_if_data *sdata;
788 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
789
790 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
791 rcu_read_lock();
792 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
793 band = chanctx_conf->def.chan->band;
794 rcu_read_unlock();
795
796 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
797 NL80211_IFTYPE_MESH_POINT);
798 head_len = hdr_len +
799 2 + /* NULL SSID */
800 /* Channel Switch Announcement */
801 2 + sizeof(struct ieee80211_channel_sw_ie) +
802 /* Mesh Channel Switch Parameters */
803 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
804 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
805 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
806 2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
807 2 + 8 + /* supported rates */
808 2 + 3; /* DS params */
809 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
810 2 + sizeof(struct ieee80211_ht_cap) +
811 2 + sizeof(struct ieee80211_ht_operation) +
812 2 + ifmsh->mesh_id_len +
813 2 + sizeof(struct ieee80211_meshconf_ie) +
814 2 + sizeof(__le16) + /* awake window */
815 2 + sizeof(struct ieee80211_vht_cap) +
816 2 + sizeof(struct ieee80211_vht_operation) +
817 ie_len_he_cap +
818 2 + 1 + sizeof(struct ieee80211_he_operation) +
819 sizeof(struct ieee80211_he_6ghz_oper) +
820 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
821 ifmsh->ie_len;
822
823 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
824 /* need an skb for IE builders to operate on */
825 skb = dev_alloc_skb(max(head_len, tail_len));
826
827 if (!bcn || !skb)
828 goto out_free;
829
830 /*
831 * pointers go into the block we allocated,
832 * memory is | beacon_data | head | tail |
833 */
834 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
835
836 /* fill in the head */
837 mgmt = skb_put_zero(skb, hdr_len);
838 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
839 IEEE80211_STYPE_BEACON);
840 eth_broadcast_addr(mgmt->da);
841 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
842 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
843 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
844 mgmt->u.beacon.beacon_int =
845 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
846 mgmt->u.beacon.capab_info |= cpu_to_le16(
847 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
848
849 pos = skb_put(skb, 2);
850 *pos++ = WLAN_EID_SSID;
851 *pos++ = 0x0;
852
853 rcu_read_lock();
854 csa = rcu_dereference(ifmsh->csa);
855 if (csa) {
856 enum nl80211_channel_type ct;
857 struct cfg80211_chan_def *chandef;
858 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
859 2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
860
861 pos = skb_put_zero(skb, ie_len);
862 *pos++ = WLAN_EID_CHANNEL_SWITCH;
863 *pos++ = 3;
864 *pos++ = 0x0;
865 *pos++ = ieee80211_frequency_to_channel(
866 csa->settings.chandef.chan->center_freq);
867 bcn->cntdwn_current_counter = csa->settings.count;
868 bcn->cntdwn_counter_offsets[0] = hdr_len + 6;
869 *pos++ = csa->settings.count;
870 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
871 *pos++ = 6;
872 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
873 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
874 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
875 } else {
876 *pos++ = ifmsh->chsw_ttl;
877 }
878 *pos++ |= csa->settings.block_tx ?
879 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
880 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
881 pos += 2;
882 put_unaligned_le16(ifmsh->pre_value, pos);
883 pos += 2;
884
885 switch (csa->settings.chandef.width) {
886 case NL80211_CHAN_WIDTH_40:
887 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
888 pos = skb_put_zero(skb, ie_len);
889
890 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
891 *pos++ = 1; /* len */
892 ct = cfg80211_get_chandef_type(&csa->settings.chandef);
893 if (ct == NL80211_CHAN_HT40PLUS)
894 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
895 else
896 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
897 break;
898 case NL80211_CHAN_WIDTH_80:
899 case NL80211_CHAN_WIDTH_80P80:
900 case NL80211_CHAN_WIDTH_160:
901 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
902 ie_len = 2 + 2 +
903 sizeof(struct ieee80211_wide_bw_chansw_ie);
904 pos = skb_put_zero(skb, ie_len);
905
906 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
907 *pos++ = 5; /* len */
908 /* put sub IE */
909 chandef = &csa->settings.chandef;
910 ieee80211_ie_build_wide_bw_cs(pos, chandef);
911 break;
912 default:
913 break;
914 }
915 }
916 rcu_read_unlock();
917
918 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
919 mesh_add_ds_params_ie(sdata, skb))
920 goto out_free;
921
922 bcn->head_len = skb->len;
923 memcpy(bcn->head, skb->data, bcn->head_len);
924
925 /* now the tail */
926 skb_trim(skb, 0);
927 bcn->tail = bcn->head + bcn->head_len;
928
929 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
930 mesh_add_rsn_ie(sdata, skb) ||
931 mesh_add_ht_cap_ie(sdata, skb) ||
932 mesh_add_ht_oper_ie(sdata, skb) ||
933 mesh_add_meshid_ie(sdata, skb) ||
934 mesh_add_meshconf_ie(sdata, skb) ||
935 mesh_add_awake_window_ie(sdata, skb) ||
936 mesh_add_vht_cap_ie(sdata, skb) ||
937 mesh_add_vht_oper_ie(sdata, skb) ||
938 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
939 mesh_add_he_oper_ie(sdata, skb) ||
940 mesh_add_he_6ghz_cap_ie(sdata, skb) ||
941 mesh_add_vendor_ies(sdata, skb))
942 goto out_free;
943
944 bcn->tail_len = skb->len;
945 memcpy(bcn->tail, skb->data, bcn->tail_len);
946 bcn->meshconf = (struct ieee80211_meshconf_ie *)
947 (bcn->tail + ifmsh->meshconf_offset);
948
949 dev_kfree_skb(skb);
950 rcu_assign_pointer(ifmsh->beacon, bcn);
951 return 0;
952 out_free:
953 kfree(bcn);
954 dev_kfree_skb(skb);
955 return -ENOMEM;
956 }
957
958 static int
ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data * sdata)959 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
960 {
961 struct beacon_data *old_bcn;
962 int ret;
963
964 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
965 lockdep_is_held(&sdata->wdev.mtx));
966 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
967 if (ret)
968 /* just reuse old beacon */
969 return ret;
970
971 if (old_bcn)
972 kfree_rcu(old_bcn, rcu_head);
973 return 0;
974 }
975
ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data * sdata,u32 changed)976 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
977 u32 changed)
978 {
979 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
980 unsigned long bits = changed;
981 u32 bit;
982
983 if (!bits)
984 return;
985
986 /* if we race with running work, worst case this work becomes a noop */
987 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
988 set_bit(bit, &ifmsh->mbss_changed);
989 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
990 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
991 }
992
ieee80211_start_mesh(struct ieee80211_sub_if_data * sdata)993 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
994 {
995 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
996 struct ieee80211_local *local = sdata->local;
997 u32 changed = BSS_CHANGED_BEACON |
998 BSS_CHANGED_BEACON_ENABLED |
999 BSS_CHANGED_HT |
1000 BSS_CHANGED_BASIC_RATES |
1001 BSS_CHANGED_BEACON_INT |
1002 BSS_CHANGED_MCAST_RATE;
1003
1004 local->fif_other_bss++;
1005 /* mesh ifaces must set allmulti to forward mcast traffic */
1006 atomic_inc(&local->iff_allmultis);
1007 ieee80211_configure_filter(local);
1008
1009 ifmsh->mesh_cc_id = 0; /* Disabled */
1010 /* register sync ops from extensible synchronization framework */
1011 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1012 ifmsh->sync_offset_clockdrift_max = 0;
1013 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1014 ieee80211_mesh_root_setup(ifmsh);
1015 ieee80211_queue_work(&local->hw, &sdata->work);
1016 sdata->vif.bss_conf.ht_operation_mode =
1017 ifmsh->mshcfg.ht_opmode;
1018 sdata->vif.bss_conf.enable_beacon = true;
1019
1020 changed |= ieee80211_mps_local_status_update(sdata);
1021
1022 if (ieee80211_mesh_build_beacon(ifmsh)) {
1023 ieee80211_stop_mesh(sdata);
1024 return -ENOMEM;
1025 }
1026
1027 ieee80211_recalc_dtim(local, sdata);
1028 ieee80211_bss_info_change_notify(sdata, changed);
1029
1030 netif_carrier_on(sdata->dev);
1031 return 0;
1032 }
1033
ieee80211_stop_mesh(struct ieee80211_sub_if_data * sdata)1034 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1035 {
1036 struct ieee80211_local *local = sdata->local;
1037 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1038 struct beacon_data *bcn;
1039
1040 netif_carrier_off(sdata->dev);
1041
1042 /* flush STAs and mpaths on this iface */
1043 sta_info_flush(sdata);
1044 ieee80211_free_keys(sdata, true);
1045 mesh_path_flush_by_iface(sdata);
1046
1047 /* stop the beacon */
1048 ifmsh->mesh_id_len = 0;
1049 sdata->vif.bss_conf.enable_beacon = false;
1050 sdata->beacon_rate_set = false;
1051 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1052 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
1053
1054 /* remove beacon */
1055 bcn = rcu_dereference_protected(ifmsh->beacon,
1056 lockdep_is_held(&sdata->wdev.mtx));
1057 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1058 kfree_rcu(bcn, rcu_head);
1059
1060 /* free all potentially still buffered group-addressed frames */
1061 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1062 skb_queue_purge(&ifmsh->ps.bc_buf);
1063
1064 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1065 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1066 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1067
1068 /* clear any mesh work (for next join) we may have accrued */
1069 ifmsh->wrkq_flags = 0;
1070 ifmsh->mbss_changed = 0;
1071
1072 local->fif_other_bss--;
1073 atomic_dec(&local->iff_allmultis);
1074 ieee80211_configure_filter(local);
1075 }
1076
ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data * sdata)1077 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1078 {
1079 int err;
1080
1081 /* if the current channel is a DFS channel, mark the channel as
1082 * unavailable.
1083 */
1084 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1085 &sdata->vif.bss_conf.chandef,
1086 NL80211_IFTYPE_MESH_POINT);
1087 if (err > 0)
1088 cfg80211_radar_event(sdata->local->hw.wiphy,
1089 &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1090 }
1091
1092 static bool
ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)1093 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1094 struct ieee802_11_elems *elems, bool beacon)
1095 {
1096 struct cfg80211_csa_settings params;
1097 struct ieee80211_csa_ie csa_ie;
1098 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1099 struct ieee80211_supported_band *sband;
1100 int err;
1101 u32 sta_flags, vht_cap_info = 0;
1102
1103 sdata_assert_lock(sdata);
1104
1105 sband = ieee80211_get_sband(sdata);
1106 if (!sband)
1107 return false;
1108
1109 sta_flags = 0;
1110 switch (sdata->vif.bss_conf.chandef.width) {
1111 case NL80211_CHAN_WIDTH_20_NOHT:
1112 sta_flags |= IEEE80211_STA_DISABLE_HT;
1113 fallthrough;
1114 case NL80211_CHAN_WIDTH_20:
1115 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
1116 fallthrough;
1117 case NL80211_CHAN_WIDTH_40:
1118 sta_flags |= IEEE80211_STA_DISABLE_VHT;
1119 break;
1120 default:
1121 break;
1122 }
1123
1124 if (elems->vht_cap_elem)
1125 vht_cap_info =
1126 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1127
1128 memset(¶ms, 0, sizeof(params));
1129 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1130 vht_cap_info,
1131 sta_flags, sdata->vif.addr,
1132 &csa_ie);
1133 if (err < 0)
1134 return false;
1135 if (err)
1136 return false;
1137
1138 /* Mark the channel unavailable if the reason for the switch is
1139 * regulatory.
1140 */
1141 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1142 ieee80211_mesh_csa_mark_radar(sdata);
1143
1144 params.chandef = csa_ie.chandef;
1145 params.count = csa_ie.count;
1146
1147 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
1148 IEEE80211_CHAN_DISABLED) ||
1149 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
1150 NL80211_IFTYPE_MESH_POINT)) {
1151 sdata_info(sdata,
1152 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1153 sdata->vif.addr,
1154 params.chandef.chan->center_freq,
1155 params.chandef.width,
1156 params.chandef.center_freq1,
1157 params.chandef.center_freq2);
1158 return false;
1159 }
1160
1161 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1162 ¶ms.chandef,
1163 NL80211_IFTYPE_MESH_POINT);
1164 if (err < 0)
1165 return false;
1166 if (err > 0 && !ifmsh->userspace_handles_dfs) {
1167 sdata_info(sdata,
1168 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1169 sdata->vif.addr,
1170 params.chandef.chan->center_freq,
1171 params.chandef.width,
1172 params.chandef.center_freq1,
1173 params.chandef.center_freq2);
1174 return false;
1175 }
1176
1177 params.radar_required = err;
1178
1179 if (cfg80211_chandef_identical(¶ms.chandef,
1180 &sdata->vif.bss_conf.chandef)) {
1181 mcsa_dbg(sdata,
1182 "received csa with an identical chandef, ignoring\n");
1183 return true;
1184 }
1185
1186 mcsa_dbg(sdata,
1187 "received channel switch announcement to go to channel %d MHz\n",
1188 params.chandef.chan->center_freq);
1189
1190 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1191 if (beacon) {
1192 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1193 if (ifmsh->pre_value >= csa_ie.pre_value)
1194 return false;
1195 ifmsh->pre_value = csa_ie.pre_value;
1196 }
1197
1198 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1199 return false;
1200
1201 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1202
1203 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1204 ¶ms) < 0)
1205 return false;
1206
1207 return true;
1208 }
1209
1210 static void
ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1211 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1212 struct ieee80211_mgmt *mgmt, size_t len)
1213 {
1214 struct ieee80211_local *local = sdata->local;
1215 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1216 struct sk_buff *presp;
1217 struct beacon_data *bcn;
1218 struct ieee80211_mgmt *hdr;
1219 struct ieee802_11_elems elems;
1220 size_t baselen;
1221 u8 *pos;
1222
1223 pos = mgmt->u.probe_req.variable;
1224 baselen = (u8 *) pos - (u8 *) mgmt;
1225 if (baselen > len)
1226 return;
1227
1228 ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid,
1229 NULL);
1230
1231 if (!elems.mesh_id)
1232 return;
1233
1234 /* 802.11-2012 10.1.4.3.2 */
1235 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1236 !is_broadcast_ether_addr(mgmt->da)) ||
1237 elems.ssid_len != 0)
1238 return;
1239
1240 if (elems.mesh_id_len != 0 &&
1241 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1242 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1243 return;
1244
1245 rcu_read_lock();
1246 bcn = rcu_dereference(ifmsh->beacon);
1247
1248 if (!bcn)
1249 goto out;
1250
1251 presp = dev_alloc_skb(local->tx_headroom +
1252 bcn->head_len + bcn->tail_len);
1253 if (!presp)
1254 goto out;
1255
1256 skb_reserve(presp, local->tx_headroom);
1257 skb_put_data(presp, bcn->head, bcn->head_len);
1258 skb_put_data(presp, bcn->tail, bcn->tail_len);
1259 hdr = (struct ieee80211_mgmt *) presp->data;
1260 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1261 IEEE80211_STYPE_PROBE_RESP);
1262 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1263 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1264 ieee80211_tx_skb(sdata, presp);
1265 out:
1266 rcu_read_unlock();
1267 }
1268
ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data * sdata,u16 stype,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1269 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1270 u16 stype,
1271 struct ieee80211_mgmt *mgmt,
1272 size_t len,
1273 struct ieee80211_rx_status *rx_status)
1274 {
1275 struct ieee80211_local *local = sdata->local;
1276 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1277 struct ieee802_11_elems elems;
1278 struct ieee80211_channel *channel;
1279 size_t baselen;
1280 int freq;
1281 enum nl80211_band band = rx_status->band;
1282
1283 /* ignore ProbeResp to foreign address */
1284 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1285 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1286 return;
1287
1288 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1289 if (baselen > len)
1290 return;
1291
1292 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1293 false, &elems, mgmt->bssid, NULL);
1294
1295 /* ignore non-mesh or secure / unsecure mismatch */
1296 if ((!elems.mesh_id || !elems.mesh_config) ||
1297 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1298 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1299 return;
1300
1301 if (elems.ds_params)
1302 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1303 else
1304 freq = rx_status->freq;
1305
1306 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1307
1308 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1309 return;
1310
1311 if (mesh_matches_local(sdata, &elems)) {
1312 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1313 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1314 if (!sdata->u.mesh.user_mpm ||
1315 sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1316 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1317 mesh_neighbour_update(sdata, mgmt->sa, &elems,
1318 rx_status);
1319
1320 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1321 !sdata->vif.csa_active)
1322 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1323 }
1324
1325 if (ifmsh->sync_ops)
1326 ifmsh->sync_ops->rx_bcn_presp(sdata,
1327 stype, mgmt, &elems, rx_status);
1328 }
1329
ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data * sdata)1330 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1331 {
1332 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1333 struct mesh_csa_settings *tmp_csa_settings;
1334 int ret = 0;
1335 int changed = 0;
1336
1337 /* Reset the TTL value and Initiator flag */
1338 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1339 ifmsh->chsw_ttl = 0;
1340
1341 /* Remove the CSA and MCSP elements from the beacon */
1342 tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
1343 lockdep_is_held(&sdata->wdev.mtx));
1344 RCU_INIT_POINTER(ifmsh->csa, NULL);
1345 if (tmp_csa_settings)
1346 kfree_rcu(tmp_csa_settings, rcu_head);
1347 ret = ieee80211_mesh_rebuild_beacon(sdata);
1348 if (ret)
1349 return -EINVAL;
1350
1351 changed |= BSS_CHANGED_BEACON;
1352
1353 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1354 sdata->vif.bss_conf.chandef.chan->center_freq);
1355 return changed;
1356 }
1357
ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)1358 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1359 struct cfg80211_csa_settings *csa_settings)
1360 {
1361 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1362 struct mesh_csa_settings *tmp_csa_settings;
1363 int ret = 0;
1364
1365 lockdep_assert_held(&sdata->wdev.mtx);
1366
1367 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1368 GFP_ATOMIC);
1369 if (!tmp_csa_settings)
1370 return -ENOMEM;
1371
1372 memcpy(&tmp_csa_settings->settings, csa_settings,
1373 sizeof(struct cfg80211_csa_settings));
1374
1375 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1376
1377 ret = ieee80211_mesh_rebuild_beacon(sdata);
1378 if (ret) {
1379 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1380 RCU_INIT_POINTER(ifmsh->csa, NULL);
1381 kfree_rcu(tmp_csa_settings, rcu_head);
1382 return ret;
1383 }
1384
1385 return BSS_CHANGED_BEACON;
1386 }
1387
mesh_fwd_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee802_11_elems * elems)1388 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1389 struct ieee80211_mgmt *mgmt, size_t len,
1390 struct ieee802_11_elems *elems)
1391 {
1392 struct ieee80211_mgmt *mgmt_fwd;
1393 struct sk_buff *skb;
1394 struct ieee80211_local *local = sdata->local;
1395
1396 skb = dev_alloc_skb(local->tx_headroom + len);
1397 if (!skb)
1398 return -ENOMEM;
1399 skb_reserve(skb, local->tx_headroom);
1400 mgmt_fwd = skb_put(skb, len);
1401
1402 elems->mesh_chansw_params_ie->mesh_ttl--;
1403 elems->mesh_chansw_params_ie->mesh_flags &=
1404 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1405
1406 memcpy(mgmt_fwd, mgmt, len);
1407 eth_broadcast_addr(mgmt_fwd->da);
1408 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1409 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1410
1411 ieee80211_tx_skb(sdata, skb);
1412 return 0;
1413 }
1414
mesh_rx_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1415 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1416 struct ieee80211_mgmt *mgmt, size_t len)
1417 {
1418 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1419 struct ieee802_11_elems elems;
1420 u16 pre_value;
1421 bool fwd_csa = true;
1422 size_t baselen;
1423 u8 *pos;
1424
1425 if (mgmt->u.action.u.measurement.action_code !=
1426 WLAN_ACTION_SPCT_CHL_SWITCH)
1427 return;
1428
1429 pos = mgmt->u.action.u.chan_switch.variable;
1430 baselen = offsetof(struct ieee80211_mgmt,
1431 u.action.u.chan_switch.variable);
1432 ieee802_11_parse_elems(pos, len - baselen, true, &elems,
1433 mgmt->bssid, NULL);
1434
1435 if (!mesh_matches_local(sdata, &elems))
1436 return;
1437
1438 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1439 if (!--ifmsh->chsw_ttl)
1440 fwd_csa = false;
1441
1442 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1443 if (ifmsh->pre_value >= pre_value)
1444 return;
1445
1446 ifmsh->pre_value = pre_value;
1447
1448 if (!sdata->vif.csa_active &&
1449 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1450 mcsa_dbg(sdata, "Failed to process CSA action frame");
1451 return;
1452 }
1453
1454 /* forward or re-broadcast the CSA frame */
1455 if (fwd_csa) {
1456 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0)
1457 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1458 }
1459 }
1460
ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1461 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1462 struct ieee80211_mgmt *mgmt,
1463 size_t len,
1464 struct ieee80211_rx_status *rx_status)
1465 {
1466 switch (mgmt->u.action.category) {
1467 case WLAN_CATEGORY_SELF_PROTECTED:
1468 switch (mgmt->u.action.u.self_prot.action_code) {
1469 case WLAN_SP_MESH_PEERING_OPEN:
1470 case WLAN_SP_MESH_PEERING_CLOSE:
1471 case WLAN_SP_MESH_PEERING_CONFIRM:
1472 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1473 break;
1474 }
1475 break;
1476 case WLAN_CATEGORY_MESH_ACTION:
1477 if (mesh_action_is_path_sel(mgmt))
1478 mesh_rx_path_sel_frame(sdata, mgmt, len);
1479 break;
1480 case WLAN_CATEGORY_SPECTRUM_MGMT:
1481 mesh_rx_csa_frame(sdata, mgmt, len);
1482 break;
1483 }
1484 }
1485
ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1486 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1487 struct sk_buff *skb)
1488 {
1489 struct ieee80211_rx_status *rx_status;
1490 struct ieee80211_mgmt *mgmt;
1491 u16 stype;
1492
1493 sdata_lock(sdata);
1494
1495 /* mesh already went down */
1496 if (!sdata->u.mesh.mesh_id_len)
1497 goto out;
1498
1499 rx_status = IEEE80211_SKB_RXCB(skb);
1500 mgmt = (struct ieee80211_mgmt *) skb->data;
1501 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1502
1503 switch (stype) {
1504 case IEEE80211_STYPE_PROBE_RESP:
1505 case IEEE80211_STYPE_BEACON:
1506 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1507 rx_status);
1508 break;
1509 case IEEE80211_STYPE_PROBE_REQ:
1510 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1511 break;
1512 case IEEE80211_STYPE_ACTION:
1513 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1514 break;
1515 }
1516 out:
1517 sdata_unlock(sdata);
1518 }
1519
mesh_bss_info_changed(struct ieee80211_sub_if_data * sdata)1520 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1521 {
1522 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1523 u32 bit, changed = 0;
1524
1525 for_each_set_bit(bit, &ifmsh->mbss_changed,
1526 sizeof(changed) * BITS_PER_BYTE) {
1527 clear_bit(bit, &ifmsh->mbss_changed);
1528 changed |= BIT(bit);
1529 }
1530
1531 if (sdata->vif.bss_conf.enable_beacon &&
1532 (changed & (BSS_CHANGED_BEACON |
1533 BSS_CHANGED_HT |
1534 BSS_CHANGED_BASIC_RATES |
1535 BSS_CHANGED_BEACON_INT)))
1536 if (ieee80211_mesh_rebuild_beacon(sdata))
1537 return;
1538
1539 ieee80211_bss_info_change_notify(sdata, changed);
1540 }
1541
ieee80211_mesh_work(struct ieee80211_sub_if_data * sdata)1542 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1543 {
1544 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1545
1546 sdata_lock(sdata);
1547
1548 /* mesh already went down */
1549 if (!sdata->u.mesh.mesh_id_len)
1550 goto out;
1551
1552 if (ifmsh->preq_queue_len &&
1553 time_after(jiffies,
1554 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1555 mesh_path_start_discovery(sdata);
1556
1557 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1558 ieee80211_mesh_housekeeping(sdata);
1559
1560 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1561 ieee80211_mesh_rootpath(sdata);
1562
1563 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1564 mesh_sync_adjust_tsf(sdata);
1565
1566 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1567 mesh_bss_info_changed(sdata);
1568 out:
1569 sdata_unlock(sdata);
1570 }
1571
1572
ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data * sdata)1573 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1574 {
1575 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1576 static u8 zero_addr[ETH_ALEN] = {};
1577
1578 timer_setup(&ifmsh->housekeeping_timer,
1579 ieee80211_mesh_housekeeping_timer, 0);
1580
1581 ifmsh->accepting_plinks = true;
1582 atomic_set(&ifmsh->mpaths, 0);
1583 mesh_rmc_init(sdata);
1584 ifmsh->last_preq = jiffies;
1585 ifmsh->next_perr = jiffies;
1586 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1587 /* Allocate all mesh structures when creating the first mesh interface. */
1588 if (!mesh_allocated)
1589 ieee80211s_init();
1590
1591 mesh_pathtbl_init(sdata);
1592
1593 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1594 timer_setup(&ifmsh->mesh_path_root_timer,
1595 ieee80211_mesh_path_root_timer, 0);
1596 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1597 skb_queue_head_init(&ifmsh->ps.bc_buf);
1598 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1599 spin_lock_init(&ifmsh->sync_offset_lock);
1600 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1601
1602 sdata->vif.bss_conf.bssid = zero_addr;
1603 }
1604
ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data * sdata)1605 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1606 {
1607 mesh_rmc_free(sdata);
1608 mesh_pathtbl_unregister(sdata);
1609 }
1610
