1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2018 - 2022 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, NULL,
108 &sta_chan_def);
109
110 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
111 &sta_chan_def))
112 return false;
113
114 return true;
115 }
116
117 /**
118 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
119 *
120 * @ie: information elements of a management frame from the mesh peer
121 */
mesh_peer_accepts_plinks(struct ieee802_11_elems * ie)122 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
123 {
124 return (ie->mesh_config->meshconf_cap &
125 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
126 }
127
128 /**
129 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
130 *
131 * @sdata: mesh interface in which mesh beacons are going to be updated
132 *
133 * Returns: beacon changed flag if the beacon content changed.
134 */
mesh_accept_plinks_update(struct ieee80211_sub_if_data * sdata)135 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
136 {
137 bool free_plinks;
138 u32 changed = 0;
139
140 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
141 * the mesh interface might be able to establish plinks with peers that
142 * are already on the table but are not on PLINK_ESTAB state. However,
143 * in general the mesh interface is not accepting peer link requests
144 * from new peers, and that must be reflected in the beacon
145 */
146 free_plinks = mesh_plink_availables(sdata);
147
148 if (free_plinks != sdata->u.mesh.accepting_plinks) {
149 sdata->u.mesh.accepting_plinks = free_plinks;
150 changed = BSS_CHANGED_BEACON;
151 }
152
153 return changed;
154 }
155
156 /*
157 * mesh_sta_cleanup - clean up any mesh sta state
158 *
159 * @sta: mesh sta to clean up.
160 */
mesh_sta_cleanup(struct sta_info * sta)161 void mesh_sta_cleanup(struct sta_info *sta)
162 {
163 struct ieee80211_sub_if_data *sdata = sta->sdata;
164 u32 changed = mesh_plink_deactivate(sta);
165
166 if (changed)
167 ieee80211_mbss_info_change_notify(sdata, changed);
168 }
169
mesh_rmc_init(struct ieee80211_sub_if_data * sdata)170 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
171 {
172 int i;
173
174 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
175 if (!sdata->u.mesh.rmc)
176 return -ENOMEM;
177 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
178 for (i = 0; i < RMC_BUCKETS; i++)
179 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
180 return 0;
181 }
182
mesh_rmc_free(struct ieee80211_sub_if_data * sdata)183 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
184 {
185 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
186 struct rmc_entry *p;
187 struct hlist_node *n;
188 int i;
189
190 if (!sdata->u.mesh.rmc)
191 return;
192
193 for (i = 0; i < RMC_BUCKETS; i++) {
194 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
195 hlist_del(&p->list);
196 kmem_cache_free(rm_cache, p);
197 }
198 }
199
200 kfree(rmc);
201 sdata->u.mesh.rmc = NULL;
202 }
203
204 /**
205 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
206 *
207 * @sdata: interface
208 * @sa: source address
209 * @mesh_hdr: mesh_header
210 *
211 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
212 *
213 * Checks using the source address and the mesh sequence number if we have
214 * received this frame lately. If the frame is not in the cache, it is added to
215 * it.
216 */
mesh_rmc_check(struct ieee80211_sub_if_data * sdata,const u8 * sa,struct ieee80211s_hdr * mesh_hdr)217 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
218 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
219 {
220 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
221 u32 seqnum = 0;
222 int entries = 0;
223 u8 idx;
224 struct rmc_entry *p;
225 struct hlist_node *n;
226
227 if (!rmc)
228 return -1;
229
230 /* Don't care about endianness since only match matters */
231 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
232 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
233 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
234 ++entries;
235 if (time_after(jiffies, p->exp_time) ||
236 entries == RMC_QUEUE_MAX_LEN) {
237 hlist_del(&p->list);
238 kmem_cache_free(rm_cache, p);
239 --entries;
240 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
241 return -1;
242 }
243
244 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
245 if (!p)
246 return 0;
247
248 p->seqnum = seqnum;
249 p->exp_time = jiffies + RMC_TIMEOUT;
250 memcpy(p->sa, sa, ETH_ALEN);
251 hlist_add_head(&p->list, &rmc->bucket[idx]);
252 return 0;
253 }
254
mesh_add_meshconf_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)255 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
256 struct sk_buff *skb)
257 {
258 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
259 u8 *pos, neighbors;
260 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
261 bool is_connected_to_gate = ifmsh->num_gates > 0 ||
262 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
263 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
264 bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
265
266 if (skb_tailroom(skb) < 2 + meshconf_len)
267 return -ENOMEM;
268
269 pos = skb_put(skb, 2 + meshconf_len);
270 *pos++ = WLAN_EID_MESH_CONFIG;
271 *pos++ = meshconf_len;
272
273 /* save a pointer for quick updates in pre-tbtt */
274 ifmsh->meshconf_offset = pos - skb->data;
275
276 /* Active path selection protocol ID */
277 *pos++ = ifmsh->mesh_pp_id;
278 /* Active path selection metric ID */
279 *pos++ = ifmsh->mesh_pm_id;
280 /* Congestion control mode identifier */
281 *pos++ = ifmsh->mesh_cc_id;
282 /* Synchronization protocol identifier */
283 *pos++ = ifmsh->mesh_sp_id;
284 /* Authentication Protocol identifier */
285 *pos++ = ifmsh->mesh_auth_id;
286 /* Mesh Formation Info - number of neighbors */
287 neighbors = atomic_read(&ifmsh->estab_plinks);
288 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
289 *pos++ = (is_connected_to_as << 7) |
290 (neighbors << 1) |
291 is_connected_to_gate;
292 /* Mesh capability */
293 *pos = 0x00;
294 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
295 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
296 *pos |= ifmsh->accepting_plinks ?
297 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
298 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
299 *pos |= ifmsh->ps_peers_deep_sleep ?
300 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
301 return 0;
302 }
303
mesh_add_meshid_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)304 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
305 {
306 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
307 u8 *pos;
308
309 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
310 return -ENOMEM;
311
312 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
313 *pos++ = WLAN_EID_MESH_ID;
314 *pos++ = ifmsh->mesh_id_len;
315 if (ifmsh->mesh_id_len)
316 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
317
318 return 0;
319 }
320
mesh_add_awake_window_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)321 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
322 struct sk_buff *skb)
323 {
324 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
325 u8 *pos;
326
327 /* see IEEE802.11-2012 13.14.6 */
328 if (ifmsh->ps_peers_light_sleep == 0 &&
329 ifmsh->ps_peers_deep_sleep == 0 &&
330 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
331 return 0;
332
333 if (skb_tailroom(skb) < 4)
334 return -ENOMEM;
335
336 pos = skb_put(skb, 2 + 2);
337 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
338 *pos++ = 2;
339 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
340
341 return 0;
342 }
343
mesh_add_vendor_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)344 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
345 struct sk_buff *skb)
346 {
347 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
348 u8 offset, len;
349 const u8 *data;
350
351 if (!ifmsh->ie || !ifmsh->ie_len)
352 return 0;
353
354 /* fast-forward to vendor IEs */
355 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
356
357 if (offset < ifmsh->ie_len) {
358 len = ifmsh->ie_len - offset;
359 data = ifmsh->ie + offset;
360 if (skb_tailroom(skb) < len)
361 return -ENOMEM;
362 skb_put_data(skb, data, len);
363 }
364
365 return 0;
366 }
367
mesh_add_rsn_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)368 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
369 {
370 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
371 u8 len = 0;
372 const u8 *data;
373
374 if (!ifmsh->ie || !ifmsh->ie_len)
375 return 0;
376
377 /* find RSN IE */
378 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
379 if (!data)
380 return 0;
381
382 len = data[1] + 2;
383
384 if (skb_tailroom(skb) < len)
385 return -ENOMEM;
386 skb_put_data(skb, data, len);
387
388 return 0;
389 }
390
mesh_add_ds_params_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)391 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
392 struct sk_buff *skb)
393 {
394 struct ieee80211_chanctx_conf *chanctx_conf;
395 struct ieee80211_channel *chan;
396 u8 *pos;
397
398 if (skb_tailroom(skb) < 3)
399 return -ENOMEM;
400
401 rcu_read_lock();
402 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
403 if (WARN_ON(!chanctx_conf)) {
404 rcu_read_unlock();
405 return -EINVAL;
406 }
407 chan = chanctx_conf->def.chan;
408 rcu_read_unlock();
409
410 pos = skb_put(skb, 2 + 1);
411 *pos++ = WLAN_EID_DS_PARAMS;
412 *pos++ = 1;
413 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
414
415 return 0;
416 }
417
mesh_add_ht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)418 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
419 struct sk_buff *skb)
420 {
421 struct ieee80211_supported_band *sband;
422 u8 *pos;
423
424 sband = ieee80211_get_sband(sdata);
425 if (!sband)
426 return -EINVAL;
427
428 /* HT not allowed in 6 GHz */
429 if (sband->band == NL80211_BAND_6GHZ)
430 return 0;
431
432 if (!sband->ht_cap.ht_supported ||
433 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
434 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
435 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
436 return 0;
437
438 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
439 return -ENOMEM;
440
441 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
442 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
443
444 return 0;
445 }
446
mesh_add_ht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)447 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
448 struct sk_buff *skb)
449 {
450 struct ieee80211_local *local = sdata->local;
451 struct ieee80211_chanctx_conf *chanctx_conf;
452 struct ieee80211_channel *channel;
453 struct ieee80211_supported_band *sband;
454 struct ieee80211_sta_ht_cap *ht_cap;
455 u8 *pos;
456
457 rcu_read_lock();
458 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
459 if (WARN_ON(!chanctx_conf)) {
460 rcu_read_unlock();
461 return -EINVAL;
462 }
463 channel = chanctx_conf->def.chan;
464 rcu_read_unlock();
465
466 sband = local->hw.wiphy->bands[channel->band];
467 ht_cap = &sband->ht_cap;
468
469 /* HT not allowed in 6 GHz */
470 if (sband->band == NL80211_BAND_6GHZ)
471 return 0;
472
473 if (!ht_cap->ht_supported ||
474 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
475 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
476 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
477 return 0;
478
479 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
480 return -ENOMEM;
481
482 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
483 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
484 sdata->vif.bss_conf.ht_operation_mode,
485 false);
486
487 return 0;
488 }
489
mesh_add_vht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)490 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
491 struct sk_buff *skb)
492 {
493 struct ieee80211_supported_band *sband;
494 u8 *pos;
495
496 sband = ieee80211_get_sband(sdata);
497 if (!sband)
498 return -EINVAL;
499
500 /* VHT not allowed in 6 GHz */
501 if (sband->band == NL80211_BAND_6GHZ)
502 return 0;
503
504 if (!sband->vht_cap.vht_supported ||
505 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
506 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
507 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
508 return 0;
509
510 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
511 return -ENOMEM;
512
513 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
514 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
515
516 return 0;
517 }
518
mesh_add_vht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)519 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
520 struct sk_buff *skb)
521 {
522 struct ieee80211_local *local = sdata->local;
523 struct ieee80211_chanctx_conf *chanctx_conf;
524 struct ieee80211_channel *channel;
525 struct ieee80211_supported_band *sband;
526 struct ieee80211_sta_vht_cap *vht_cap;
527 u8 *pos;
528
529 rcu_read_lock();
530 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
531 if (WARN_ON(!chanctx_conf)) {
532 rcu_read_unlock();
533 return -EINVAL;
534 }
535 channel = chanctx_conf->def.chan;
536 rcu_read_unlock();
537
538 sband = local->hw.wiphy->bands[channel->band];
539 vht_cap = &sband->vht_cap;
540
541 /* VHT not allowed in 6 GHz */
542 if (sband->band == NL80211_BAND_6GHZ)
543 return 0;
544
545 if (!vht_cap->vht_supported ||
546 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
547 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
548 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
549 return 0;
550
551 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
552 return -ENOMEM;
553
554 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
555 ieee80211_ie_build_vht_oper(pos, vht_cap,
556 &sdata->vif.bss_conf.chandef);
557
558 return 0;
559 }
560
mesh_add_he_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u8 ie_len)561 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
562 struct sk_buff *skb, u8 ie_len)
563 {
564 const struct ieee80211_sta_he_cap *he_cap;
565 struct ieee80211_supported_band *sband;
566 u8 *pos;
567
568 sband = ieee80211_get_sband(sdata);
569 if (!sband)
570 return -EINVAL;
571
572 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
573
574 if (!he_cap ||
575 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
576 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
577 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
578 return 0;
579
580 if (skb_tailroom(skb) < ie_len)
581 return -ENOMEM;
582
583 pos = skb_put(skb, ie_len);
584 ieee80211_ie_build_he_cap(0, pos, he_cap, pos + ie_len);
585
586 return 0;
587 }
588
mesh_add_he_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)589 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
590 struct sk_buff *skb)
591 {
592 const struct ieee80211_sta_he_cap *he_cap;
593 struct ieee80211_supported_band *sband;
594 u32 len;
595 u8 *pos;
596
597 sband = ieee80211_get_sband(sdata);
598 if (!sband)
599 return -EINVAL;
600
601 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
602 if (!he_cap ||
603 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
604 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
605 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
606 return 0;
607
608 len = 2 + 1 + sizeof(struct ieee80211_he_operation);
609 if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ)
610 len += sizeof(struct ieee80211_he_6ghz_oper);
611
612 if (skb_tailroom(skb) < len)
613 return -ENOMEM;
614
615 pos = skb_put(skb, len);
616 ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef);
617
618 return 0;
619 }
620
mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)621 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
622 struct sk_buff *skb)
623 {
624 struct ieee80211_supported_band *sband;
625 const struct ieee80211_sband_iftype_data *iftd;
626
627 sband = ieee80211_get_sband(sdata);
628 if (!sband)
629 return -EINVAL;
630
631 iftd = ieee80211_get_sband_iftype_data(sband,
632 NL80211_IFTYPE_MESH_POINT);
633 /* The device doesn't support HE in mesh mode or at all */
634 if (!iftd)
635 return 0;
636
637 ieee80211_ie_build_he_6ghz_cap(sdata, skb);
638 return 0;
639 }
640
ieee80211_mesh_path_timer(struct timer_list * t)641 static void ieee80211_mesh_path_timer(struct timer_list *t)
642 {
643 struct ieee80211_sub_if_data *sdata =
644 from_timer(sdata, t, u.mesh.mesh_path_timer);
645
646 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
647 }
648
ieee80211_mesh_path_root_timer(struct timer_list * t)649 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
650 {
651 struct ieee80211_sub_if_data *sdata =
652 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
653 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
654
655 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
656
657 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
658 }
659
ieee80211_mesh_root_setup(struct ieee80211_if_mesh * ifmsh)660 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
661 {
662 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
663 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
664 else {
665 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
666 /* stop running timer */
667 del_timer_sync(&ifmsh->mesh_path_root_timer);
668 }
669 }
670
671 static void
ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data * sdata,u8 * ie,u8 ie_len)672 ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
673 u8 *ie, u8 ie_len)
674 {
675 struct ieee80211_supported_band *sband;
676 const struct element *cap;
677 const struct ieee80211_he_operation *he_oper = NULL;
678
679 sband = ieee80211_get_sband(sdata);
680 if (!sband)
681 return;
682
683 if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) ||
684 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
685 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
686 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
687 return;
688
689 sdata->vif.bss_conf.he_support = true;
690
691 cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
692 if (cap && cap->datalen >= 1 + sizeof(*he_oper) &&
693 cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1))
694 he_oper = (void *)(cap->data + 1);
695
696 if (he_oper)
697 sdata->vif.bss_conf.he_oper.params =
698 __le32_to_cpu(he_oper->he_oper_params);
699 }
700
701 /**
702 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
703 * @hdr: 802.11 frame header
704 * @fc: frame control field
705 * @meshda: destination address in the mesh
706 * @meshsa: source address in the mesh. Same as TA, as frame is
707 * locally originated.
708 *
709 * Return the length of the 802.11 (does not include a mesh control header)
710 */
ieee80211_fill_mesh_addresses(struct ieee80211_hdr * hdr,__le16 * fc,const u8 * meshda,const u8 * meshsa)711 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
712 const u8 *meshda, const u8 *meshsa)
713 {
714 if (is_multicast_ether_addr(meshda)) {
715 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
716 /* DA TA SA */
717 memcpy(hdr->addr1, meshda, ETH_ALEN);
718 memcpy(hdr->addr2, meshsa, ETH_ALEN);
719 memcpy(hdr->addr3, meshsa, ETH_ALEN);
720 return 24;
721 } else {
722 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
723 /* RA TA DA SA */
724 eth_zero_addr(hdr->addr1); /* RA is resolved later */
725 memcpy(hdr->addr2, meshsa, ETH_ALEN);
726 memcpy(hdr->addr3, meshda, ETH_ALEN);
727 memcpy(hdr->addr4, meshsa, ETH_ALEN);
728 return 30;
729 }
730 }
731
732 /**
733 * ieee80211_new_mesh_header - create a new mesh header
734 * @sdata: mesh interface to be used
735 * @meshhdr: uninitialized mesh header
736 * @addr4or5: 1st address in the ae header, which may correspond to address 4
737 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
738 * be NULL.
739 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
740 * mesh frame
741 *
742 * Return the header length.
743 */
ieee80211_new_mesh_header(struct ieee80211_sub_if_data * sdata,struct ieee80211s_hdr * meshhdr,const char * addr4or5,const char * addr6)744 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
745 struct ieee80211s_hdr *meshhdr,
746 const char *addr4or5, const char *addr6)
747 {
748 if (WARN_ON(!addr4or5 && addr6))
749 return 0;
750
751 memset(meshhdr, 0, sizeof(*meshhdr));
752
753 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
754
755 /* FIXME: racy -- TX on multiple queues can be concurrent */
756 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
757 sdata->u.mesh.mesh_seqnum++;
758
759 if (addr4or5 && !addr6) {
760 meshhdr->flags |= MESH_FLAGS_AE_A4;
761 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
762 return 2 * ETH_ALEN;
763 } else if (addr4or5 && addr6) {
764 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
765 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
766 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
767 return 3 * ETH_ALEN;
768 }
769
770 return ETH_ALEN;
771 }
772
ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data * sdata)773 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
774 {
775 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
776 u32 changed;
777
778 if (ifmsh->mshcfg.plink_timeout > 0)
779 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
780 mesh_path_expire(sdata);
781
782 changed = mesh_accept_plinks_update(sdata);
783 ieee80211_mbss_info_change_notify(sdata, changed);
784
785 mod_timer(&ifmsh->housekeeping_timer,
786 round_jiffies(jiffies +
787 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
788 }
789
ieee80211_mesh_rootpath(struct ieee80211_sub_if_data * sdata)790 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
791 {
792 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
793 u32 interval;
794
795 mesh_path_tx_root_frame(sdata);
796
797 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
798 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
799 else
800 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
801
802 mod_timer(&ifmsh->mesh_path_root_timer,
803 round_jiffies(TU_TO_EXP_TIME(interval)));
804 }
805
806 static int
ieee80211_mesh_build_beacon(struct ieee80211_if_mesh * ifmsh)807 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
808 {
809 struct beacon_data *bcn;
810 int head_len, tail_len;
811 struct sk_buff *skb;
812 struct ieee80211_mgmt *mgmt;
813 struct ieee80211_chanctx_conf *chanctx_conf;
814 struct mesh_csa_settings *csa;
815 enum nl80211_band band;
816 u8 ie_len_he_cap;
817 u8 *pos;
818 struct ieee80211_sub_if_data *sdata;
819 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
820
821 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
822 rcu_read_lock();
823 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
824 band = chanctx_conf->def.chan->band;
825 rcu_read_unlock();
826
827 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
828 NL80211_IFTYPE_MESH_POINT);
829 head_len = hdr_len +
830 2 + /* NULL SSID */
831 /* Channel Switch Announcement */
832 2 + sizeof(struct ieee80211_channel_sw_ie) +
833 /* Mesh Channel Switch Parameters */
834 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
835 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
836 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
837 2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
838 2 + 8 + /* supported rates */
839 2 + 3; /* DS params */
840 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
841 2 + sizeof(struct ieee80211_ht_cap) +
842 2 + sizeof(struct ieee80211_ht_operation) +
843 2 + ifmsh->mesh_id_len +
844 2 + sizeof(struct ieee80211_meshconf_ie) +
845 2 + sizeof(__le16) + /* awake window */
846 2 + sizeof(struct ieee80211_vht_cap) +
847 2 + sizeof(struct ieee80211_vht_operation) +
848 ie_len_he_cap +
849 2 + 1 + sizeof(struct ieee80211_he_operation) +
850 sizeof(struct ieee80211_he_6ghz_oper) +
851 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
852 ifmsh->ie_len;
853
854 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
855 /* need an skb for IE builders to operate on */
856 skb = __dev_alloc_skb(max(head_len, tail_len), GFP_KERNEL);
857
858 if (!bcn || !skb)
859 goto out_free;
860
861 /*
862 * pointers go into the block we allocated,
863 * memory is | beacon_data | head | tail |
864 */
865 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
866
867 /* fill in the head */
868 mgmt = skb_put_zero(skb, hdr_len);
869 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
870 IEEE80211_STYPE_BEACON);
871 eth_broadcast_addr(mgmt->da);
872 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
873 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
874 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
875 mgmt->u.beacon.beacon_int =
876 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
877 mgmt->u.beacon.capab_info |= cpu_to_le16(
878 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
879
880 pos = skb_put(skb, 2);
881 *pos++ = WLAN_EID_SSID;
882 *pos++ = 0x0;
883
884 rcu_read_lock();
885 csa = rcu_dereference(ifmsh->csa);
886 if (csa) {
887 enum nl80211_channel_type ct;
888 struct cfg80211_chan_def *chandef;
889 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
890 2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
891
892 pos = skb_put_zero(skb, ie_len);
893 *pos++ = WLAN_EID_CHANNEL_SWITCH;
894 *pos++ = 3;
895 *pos++ = 0x0;
896 *pos++ = ieee80211_frequency_to_channel(
897 csa->settings.chandef.chan->center_freq);
898 bcn->cntdwn_current_counter = csa->settings.count;
899 bcn->cntdwn_counter_offsets[0] = hdr_len + 6;
900 *pos++ = csa->settings.count;
901 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
902 *pos++ = 6;
903 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
904 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
905 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
906 } else {
907 *pos++ = ifmsh->chsw_ttl;
908 }
909 *pos++ |= csa->settings.block_tx ?
910 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
911 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
912 pos += 2;
913 put_unaligned_le16(ifmsh->pre_value, pos);
914 pos += 2;
915
916 switch (csa->settings.chandef.width) {
917 case NL80211_CHAN_WIDTH_40:
918 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
919 pos = skb_put_zero(skb, ie_len);
920
921 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
922 *pos++ = 1; /* len */
923 ct = cfg80211_get_chandef_type(&csa->settings.chandef);
924 if (ct == NL80211_CHAN_HT40PLUS)
925 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
926 else
927 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
928 break;
929 case NL80211_CHAN_WIDTH_80:
930 case NL80211_CHAN_WIDTH_80P80:
931 case NL80211_CHAN_WIDTH_160:
932 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
933 ie_len = 2 + 2 +
934 sizeof(struct ieee80211_wide_bw_chansw_ie);
935 pos = skb_put_zero(skb, ie_len);
936
937 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
938 *pos++ = 5; /* len */
939 /* put sub IE */
940 chandef = &csa->settings.chandef;
941 ieee80211_ie_build_wide_bw_cs(pos, chandef);
942 break;
943 default:
944 break;
945 }
946 }
947 rcu_read_unlock();
948
949 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
950 mesh_add_ds_params_ie(sdata, skb))
951 goto out_free;
952
953 bcn->head_len = skb->len;
954 memcpy(bcn->head, skb->data, bcn->head_len);
955
956 /* now the tail */
957 skb_trim(skb, 0);
958 bcn->tail = bcn->head + bcn->head_len;
959
960 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
961 mesh_add_rsn_ie(sdata, skb) ||
962 mesh_add_ht_cap_ie(sdata, skb) ||
963 mesh_add_ht_oper_ie(sdata, skb) ||
964 mesh_add_meshid_ie(sdata, skb) ||
965 mesh_add_meshconf_ie(sdata, skb) ||
966 mesh_add_awake_window_ie(sdata, skb) ||
967 mesh_add_vht_cap_ie(sdata, skb) ||
968 mesh_add_vht_oper_ie(sdata, skb) ||
969 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
970 mesh_add_he_oper_ie(sdata, skb) ||
971 mesh_add_he_6ghz_cap_ie(sdata, skb) ||
972 mesh_add_vendor_ies(sdata, skb))
973 goto out_free;
974
975 bcn->tail_len = skb->len;
976 memcpy(bcn->tail, skb->data, bcn->tail_len);
977 ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len);
978 bcn->meshconf = (struct ieee80211_meshconf_ie *)
979 (bcn->tail + ifmsh->meshconf_offset);
980
981 dev_kfree_skb(skb);
982 rcu_assign_pointer(ifmsh->beacon, bcn);
983 return 0;
984 out_free:
985 kfree(bcn);
986 dev_kfree_skb(skb);
987 return -ENOMEM;
988 }
989
990 static int
ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data * sdata)991 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
992 {
993 struct beacon_data *old_bcn;
994 int ret;
995
996 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
997 lockdep_is_held(&sdata->wdev.mtx));
998 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
999 if (ret)
1000 /* just reuse old beacon */
1001 return ret;
1002
1003 if (old_bcn)
1004 kfree_rcu(old_bcn, rcu_head);
1005 return 0;
1006 }
1007
ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data * sdata,u32 changed)1008 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1009 u32 changed)
1010 {
1011 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1012 unsigned long bits = changed;
1013 u32 bit;
1014
1015 if (!bits)
1016 return;
1017
1018 /* if we race with running work, worst case this work becomes a noop */
1019 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
1020 set_bit(bit, &ifmsh->mbss_changed);
1021 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
1022 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1023 }
1024
ieee80211_start_mesh(struct ieee80211_sub_if_data * sdata)1025 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
1026 {
1027 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1028 struct ieee80211_local *local = sdata->local;
1029 u32 changed = BSS_CHANGED_BEACON |
1030 BSS_CHANGED_BEACON_ENABLED |
1031 BSS_CHANGED_HT |
1032 BSS_CHANGED_BASIC_RATES |
1033 BSS_CHANGED_BEACON_INT |
1034 BSS_CHANGED_MCAST_RATE;
1035
1036 local->fif_other_bss++;
1037 /* mesh ifaces must set allmulti to forward mcast traffic */
1038 atomic_inc(&local->iff_allmultis);
1039 ieee80211_configure_filter(local);
1040
1041 ifmsh->mesh_cc_id = 0; /* Disabled */
1042 /* register sync ops from extensible synchronization framework */
1043 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1044 ifmsh->sync_offset_clockdrift_max = 0;
1045 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1046 ieee80211_mesh_root_setup(ifmsh);
1047 ieee80211_queue_work(&local->hw, &sdata->work);
1048 sdata->vif.bss_conf.ht_operation_mode =
1049 ifmsh->mshcfg.ht_opmode;
1050 sdata->vif.bss_conf.enable_beacon = true;
1051
1052 changed |= ieee80211_mps_local_status_update(sdata);
1053
1054 if (ieee80211_mesh_build_beacon(ifmsh)) {
1055 ieee80211_stop_mesh(sdata);
1056 return -ENOMEM;
1057 }
1058
1059 ieee80211_recalc_dtim(local, sdata);
1060 ieee80211_bss_info_change_notify(sdata, changed);
1061
1062 netif_carrier_on(sdata->dev);
1063 return 0;
1064 }
1065
ieee80211_stop_mesh(struct ieee80211_sub_if_data * sdata)1066 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1067 {
1068 struct ieee80211_local *local = sdata->local;
1069 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1070 struct beacon_data *bcn;
1071
1072 netif_carrier_off(sdata->dev);
1073
1074 /* flush STAs and mpaths on this iface */
1075 sta_info_flush(sdata);
1076 ieee80211_free_keys(sdata, true);
1077 mesh_path_flush_by_iface(sdata);
1078
1079 /* stop the beacon */
1080 ifmsh->mesh_id_len = 0;
1081 sdata->vif.bss_conf.enable_beacon = false;
1082 sdata->beacon_rate_set = false;
1083 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1084 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
1085
1086 /* remove beacon */
1087 bcn = rcu_dereference_protected(ifmsh->beacon,
1088 lockdep_is_held(&sdata->wdev.mtx));
1089 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1090 kfree_rcu(bcn, rcu_head);
1091
1092 /* free all potentially still buffered group-addressed frames */
1093 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1094 skb_queue_purge(&ifmsh->ps.bc_buf);
1095
1096 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1097 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1098 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1099
1100 /* clear any mesh work (for next join) we may have accrued */
1101 ifmsh->wrkq_flags = 0;
1102 ifmsh->mbss_changed = 0;
1103
1104 local->fif_other_bss--;
1105 atomic_dec(&local->iff_allmultis);
1106 ieee80211_configure_filter(local);
1107 }
1108
ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data * sdata)1109 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1110 {
1111 int err;
1112
1113 /* if the current channel is a DFS channel, mark the channel as
1114 * unavailable.
1115 */
1116 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1117 &sdata->vif.bss_conf.chandef,
1118 NL80211_IFTYPE_MESH_POINT);
1119 if (err > 0)
1120 cfg80211_radar_event(sdata->local->hw.wiphy,
1121 &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1122 }
1123
1124 static bool
ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)1125 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1126 struct ieee802_11_elems *elems, bool beacon)
1127 {
1128 struct cfg80211_csa_settings params;
1129 struct ieee80211_csa_ie csa_ie;
1130 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1131 struct ieee80211_supported_band *sband;
1132 int err;
1133 u32 sta_flags, vht_cap_info = 0;
1134
1135 sdata_assert_lock(sdata);
1136
1137 sband = ieee80211_get_sband(sdata);
1138 if (!sband)
1139 return false;
1140
1141 sta_flags = 0;
1142 switch (sdata->vif.bss_conf.chandef.width) {
1143 case NL80211_CHAN_WIDTH_20_NOHT:
1144 sta_flags |= IEEE80211_STA_DISABLE_HT;
1145 fallthrough;
1146 case NL80211_CHAN_WIDTH_20:
1147 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
1148 fallthrough;
1149 case NL80211_CHAN_WIDTH_40:
1150 sta_flags |= IEEE80211_STA_DISABLE_VHT;
1151 break;
1152 default:
1153 break;
1154 }
1155
1156 if (elems->vht_cap_elem)
1157 vht_cap_info =
1158 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1159
1160 memset(¶ms, 0, sizeof(params));
1161 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1162 vht_cap_info,
1163 sta_flags, sdata->vif.addr,
1164 &csa_ie);
1165 if (err < 0)
1166 return false;
1167 if (err)
1168 return false;
1169
1170 /* Mark the channel unavailable if the reason for the switch is
1171 * regulatory.
1172 */
1173 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1174 ieee80211_mesh_csa_mark_radar(sdata);
1175
1176 params.chandef = csa_ie.chandef;
1177 params.count = csa_ie.count;
1178
1179 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
1180 IEEE80211_CHAN_DISABLED) ||
1181 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
1182 NL80211_IFTYPE_MESH_POINT)) {
1183 sdata_info(sdata,
1184 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1185 sdata->vif.addr,
1186 params.chandef.chan->center_freq,
1187 params.chandef.width,
1188 params.chandef.center_freq1,
1189 params.chandef.center_freq2);
1190 return false;
1191 }
1192
1193 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1194 ¶ms.chandef,
1195 NL80211_IFTYPE_MESH_POINT);
1196 if (err < 0)
1197 return false;
1198 if (err > 0 && !ifmsh->userspace_handles_dfs) {
1199 sdata_info(sdata,
1200 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1201 sdata->vif.addr,
1202 params.chandef.chan->center_freq,
1203 params.chandef.width,
1204 params.chandef.center_freq1,
1205 params.chandef.center_freq2);
1206 return false;
1207 }
1208
1209 params.radar_required = err;
1210
1211 if (cfg80211_chandef_identical(¶ms.chandef,
1212 &sdata->vif.bss_conf.chandef)) {
1213 mcsa_dbg(sdata,
1214 "received csa with an identical chandef, ignoring\n");
1215 return true;
1216 }
1217
1218 mcsa_dbg(sdata,
1219 "received channel switch announcement to go to channel %d MHz\n",
1220 params.chandef.chan->center_freq);
1221
1222 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1223 if (beacon) {
1224 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1225 if (ifmsh->pre_value >= csa_ie.pre_value)
1226 return false;
1227 ifmsh->pre_value = csa_ie.pre_value;
1228 }
1229
1230 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1231 return false;
1232
1233 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1234
1235 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1236 ¶ms) < 0)
1237 return false;
1238
1239 return true;
1240 }
1241
1242 static void
ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1243 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1244 struct ieee80211_mgmt *mgmt, size_t len)
1245 {
1246 struct ieee80211_local *local = sdata->local;
1247 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1248 struct sk_buff *presp;
1249 struct beacon_data *bcn;
1250 struct ieee80211_mgmt *hdr;
1251 struct ieee802_11_elems *elems;
1252 size_t baselen;
1253 u8 *pos;
1254
1255 pos = mgmt->u.probe_req.variable;
1256 baselen = (u8 *) pos - (u8 *) mgmt;
1257 if (baselen > len)
1258 return;
1259
1260 elems = ieee802_11_parse_elems(pos, len - baselen, false, mgmt->bssid,
1261 NULL);
1262 if (!elems)
1263 return;
1264
1265 if (!elems->mesh_id)
1266 goto free;
1267
1268 /* 802.11-2012 10.1.4.3.2 */
1269 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1270 !is_broadcast_ether_addr(mgmt->da)) ||
1271 elems->ssid_len != 0)
1272 goto free;
1273
1274 if (elems->mesh_id_len != 0 &&
1275 (elems->mesh_id_len != ifmsh->mesh_id_len ||
1276 memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1277 goto free;
1278
1279 rcu_read_lock();
1280 bcn = rcu_dereference(ifmsh->beacon);
1281
1282 if (!bcn)
1283 goto out;
1284
1285 presp = dev_alloc_skb(local->tx_headroom +
1286 bcn->head_len + bcn->tail_len);
1287 if (!presp)
1288 goto out;
1289
1290 skb_reserve(presp, local->tx_headroom);
1291 skb_put_data(presp, bcn->head, bcn->head_len);
1292 skb_put_data(presp, bcn->tail, bcn->tail_len);
1293 hdr = (struct ieee80211_mgmt *) presp->data;
1294 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1295 IEEE80211_STYPE_PROBE_RESP);
1296 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1297 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1298 ieee80211_tx_skb(sdata, presp);
1299 out:
1300 rcu_read_unlock();
1301 free:
1302 kfree(elems);
1303 }
1304
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)1305 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1306 u16 stype,
1307 struct ieee80211_mgmt *mgmt,
1308 size_t len,
1309 struct ieee80211_rx_status *rx_status)
1310 {
1311 struct ieee80211_local *local = sdata->local;
1312 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1313 struct ieee802_11_elems *elems;
1314 struct ieee80211_channel *channel;
1315 size_t baselen;
1316 int freq;
1317 enum nl80211_band band = rx_status->band;
1318
1319 /* ignore ProbeResp to foreign address */
1320 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1321 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1322 return;
1323
1324 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1325 if (baselen > len)
1326 return;
1327
1328 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1329 len - baselen,
1330 false, mgmt->bssid, NULL);
1331 if (!elems)
1332 return;
1333
1334 /* ignore non-mesh or secure / unsecure mismatch */
1335 if ((!elems->mesh_id || !elems->mesh_config) ||
1336 (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1337 (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1338 goto free;
1339
1340 if (elems->ds_params)
1341 freq = ieee80211_channel_to_frequency(elems->ds_params[0], band);
1342 else
1343 freq = rx_status->freq;
1344
1345 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1346
1347 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1348 goto free;
1349
1350 if (mesh_matches_local(sdata, elems)) {
1351 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1352 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1353 if (!sdata->u.mesh.user_mpm ||
1354 sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1355 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1356 mesh_neighbour_update(sdata, mgmt->sa, elems,
1357 rx_status);
1358
1359 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1360 !sdata->vif.bss_conf.csa_active)
1361 ieee80211_mesh_process_chnswitch(sdata, elems, true);
1362 }
1363
1364 if (ifmsh->sync_ops)
1365 ifmsh->sync_ops->rx_bcn_presp(sdata, stype, mgmt, len,
1366 elems->mesh_config, rx_status);
1367 free:
1368 kfree(elems);
1369 }
1370
ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data * sdata)1371 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1372 {
1373 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1374 struct mesh_csa_settings *tmp_csa_settings;
1375 int ret = 0;
1376 int changed = 0;
1377
1378 /* Reset the TTL value and Initiator flag */
1379 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1380 ifmsh->chsw_ttl = 0;
1381
1382 /* Remove the CSA and MCSP elements from the beacon */
1383 tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
1384 lockdep_is_held(&sdata->wdev.mtx));
1385 RCU_INIT_POINTER(ifmsh->csa, NULL);
1386 if (tmp_csa_settings)
1387 kfree_rcu(tmp_csa_settings, rcu_head);
1388 ret = ieee80211_mesh_rebuild_beacon(sdata);
1389 if (ret)
1390 return -EINVAL;
1391
1392 changed |= BSS_CHANGED_BEACON;
1393
1394 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1395 sdata->vif.bss_conf.chandef.chan->center_freq);
1396 return changed;
1397 }
1398
ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)1399 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1400 struct cfg80211_csa_settings *csa_settings)
1401 {
1402 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1403 struct mesh_csa_settings *tmp_csa_settings;
1404 int ret = 0;
1405
1406 lockdep_assert_held(&sdata->wdev.mtx);
1407
1408 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1409 GFP_ATOMIC);
1410 if (!tmp_csa_settings)
1411 return -ENOMEM;
1412
1413 memcpy(&tmp_csa_settings->settings, csa_settings,
1414 sizeof(struct cfg80211_csa_settings));
1415
1416 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1417
1418 ret = ieee80211_mesh_rebuild_beacon(sdata);
1419 if (ret) {
1420 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1421 RCU_INIT_POINTER(ifmsh->csa, NULL);
1422 kfree_rcu(tmp_csa_settings, rcu_head);
1423 return ret;
1424 }
1425
1426 return BSS_CHANGED_BEACON;
1427 }
1428
mesh_fwd_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee802_11_elems * elems)1429 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1430 struct ieee80211_mgmt *mgmt, size_t len,
1431 struct ieee802_11_elems *elems)
1432 {
1433 struct ieee80211_mgmt *mgmt_fwd;
1434 struct sk_buff *skb;
1435 struct ieee80211_local *local = sdata->local;
1436
1437 skb = dev_alloc_skb(local->tx_headroom + len);
1438 if (!skb)
1439 return -ENOMEM;
1440 skb_reserve(skb, local->tx_headroom);
1441 mgmt_fwd = skb_put(skb, len);
1442
1443 elems->mesh_chansw_params_ie->mesh_ttl--;
1444 elems->mesh_chansw_params_ie->mesh_flags &=
1445 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1446
1447 memcpy(mgmt_fwd, mgmt, len);
1448 eth_broadcast_addr(mgmt_fwd->da);
1449 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1450 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1451
1452 ieee80211_tx_skb(sdata, skb);
1453 return 0;
1454 }
1455
mesh_rx_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1456 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1457 struct ieee80211_mgmt *mgmt, size_t len)
1458 {
1459 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1460 struct ieee802_11_elems *elems;
1461 u16 pre_value;
1462 bool fwd_csa = true;
1463 size_t baselen;
1464 u8 *pos;
1465
1466 if (mgmt->u.action.u.measurement.action_code !=
1467 WLAN_ACTION_SPCT_CHL_SWITCH)
1468 return;
1469
1470 pos = mgmt->u.action.u.chan_switch.variable;
1471 baselen = offsetof(struct ieee80211_mgmt,
1472 u.action.u.chan_switch.variable);
1473 elems = ieee802_11_parse_elems(pos, len - baselen, true,
1474 mgmt->bssid, NULL);
1475 if (!elems)
1476 return;
1477
1478 if (!mesh_matches_local(sdata, elems))
1479 goto free;
1480
1481 ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl;
1482 if (!--ifmsh->chsw_ttl)
1483 fwd_csa = false;
1484
1485 pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value);
1486 if (ifmsh->pre_value >= pre_value)
1487 goto free;
1488
1489 ifmsh->pre_value = pre_value;
1490
1491 if (!sdata->vif.bss_conf.csa_active &&
1492 !ieee80211_mesh_process_chnswitch(sdata, elems, false)) {
1493 mcsa_dbg(sdata, "Failed to process CSA action frame");
1494 goto free;
1495 }
1496
1497 /* forward or re-broadcast the CSA frame */
1498 if (fwd_csa) {
1499 if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0)
1500 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1501 }
1502 free:
1503 kfree(elems);
1504 }
1505
ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1506 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1507 struct ieee80211_mgmt *mgmt,
1508 size_t len,
1509 struct ieee80211_rx_status *rx_status)
1510 {
1511 switch (mgmt->u.action.category) {
1512 case WLAN_CATEGORY_SELF_PROTECTED:
1513 switch (mgmt->u.action.u.self_prot.action_code) {
1514 case WLAN_SP_MESH_PEERING_OPEN:
1515 case WLAN_SP_MESH_PEERING_CLOSE:
1516 case WLAN_SP_MESH_PEERING_CONFIRM:
1517 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1518 break;
1519 }
1520 break;
1521 case WLAN_CATEGORY_MESH_ACTION:
1522 if (mesh_action_is_path_sel(mgmt))
1523 mesh_rx_path_sel_frame(sdata, mgmt, len);
1524 break;
1525 case WLAN_CATEGORY_SPECTRUM_MGMT:
1526 mesh_rx_csa_frame(sdata, mgmt, len);
1527 break;
1528 }
1529 }
1530
ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1531 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1532 struct sk_buff *skb)
1533 {
1534 struct ieee80211_rx_status *rx_status;
1535 struct ieee80211_mgmt *mgmt;
1536 u16 stype;
1537
1538 sdata_lock(sdata);
1539
1540 /* mesh already went down */
1541 if (!sdata->u.mesh.mesh_id_len)
1542 goto out;
1543
1544 rx_status = IEEE80211_SKB_RXCB(skb);
1545 mgmt = (struct ieee80211_mgmt *) skb->data;
1546 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1547
1548 switch (stype) {
1549 case IEEE80211_STYPE_PROBE_RESP:
1550 case IEEE80211_STYPE_BEACON:
1551 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1552 rx_status);
1553 break;
1554 case IEEE80211_STYPE_PROBE_REQ:
1555 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1556 break;
1557 case IEEE80211_STYPE_ACTION:
1558 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1559 break;
1560 }
1561 out:
1562 sdata_unlock(sdata);
1563 }
1564
mesh_bss_info_changed(struct ieee80211_sub_if_data * sdata)1565 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1566 {
1567 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1568 u32 bit, changed = 0;
1569
1570 for_each_set_bit(bit, &ifmsh->mbss_changed,
1571 sizeof(changed) * BITS_PER_BYTE) {
1572 clear_bit(bit, &ifmsh->mbss_changed);
1573 changed |= BIT(bit);
1574 }
1575
1576 if (sdata->vif.bss_conf.enable_beacon &&
1577 (changed & (BSS_CHANGED_BEACON |
1578 BSS_CHANGED_HT |
1579 BSS_CHANGED_BASIC_RATES |
1580 BSS_CHANGED_BEACON_INT)))
1581 if (ieee80211_mesh_rebuild_beacon(sdata))
1582 return;
1583
1584 ieee80211_bss_info_change_notify(sdata, changed);
1585 }
1586
ieee80211_mesh_work(struct ieee80211_sub_if_data * sdata)1587 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1588 {
1589 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1590
1591 sdata_lock(sdata);
1592
1593 /* mesh already went down */
1594 if (!sdata->u.mesh.mesh_id_len)
1595 goto out;
1596
1597 if (ifmsh->preq_queue_len &&
1598 time_after(jiffies,
1599 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1600 mesh_path_start_discovery(sdata);
1601
1602 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1603 ieee80211_mesh_housekeeping(sdata);
1604
1605 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1606 ieee80211_mesh_rootpath(sdata);
1607
1608 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1609 mesh_sync_adjust_tsf(sdata);
1610
1611 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1612 mesh_bss_info_changed(sdata);
1613 out:
1614 sdata_unlock(sdata);
1615 }
1616
1617
ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data * sdata)1618 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1619 {
1620 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1621 static u8 zero_addr[ETH_ALEN] = {};
1622
1623 timer_setup(&ifmsh->housekeeping_timer,
1624 ieee80211_mesh_housekeeping_timer, 0);
1625
1626 ifmsh->accepting_plinks = true;
1627 atomic_set(&ifmsh->mpaths, 0);
1628 mesh_rmc_init(sdata);
1629 ifmsh->last_preq = jiffies;
1630 ifmsh->next_perr = jiffies;
1631 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1632 /* Allocate all mesh structures when creating the first mesh interface. */
1633 if (!mesh_allocated)
1634 ieee80211s_init();
1635
1636 mesh_pathtbl_init(sdata);
1637
1638 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1639 timer_setup(&ifmsh->mesh_path_root_timer,
1640 ieee80211_mesh_path_root_timer, 0);
1641 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1642 skb_queue_head_init(&ifmsh->ps.bc_buf);
1643 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1644 spin_lock_init(&ifmsh->sync_offset_lock);
1645 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1646
1647 sdata->vif.bss_conf.bssid = zero_addr;
1648 }
1649
ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data * sdata)1650 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1651 {
1652 mesh_rmc_free(sdata);
1653 mesh_pathtbl_unregister(sdata);
1654 }
1655