1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2018 - 2023 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 "wme.h"
14 #include "driver-ops.h"
15
16 static int mesh_allocated;
17 static struct kmem_cache *rm_cache;
18
mesh_action_is_path_sel(struct ieee80211_mgmt * mgmt)19 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
20 {
21 return (mgmt->u.action.u.mesh_action.action_code ==
22 WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
23 }
24
ieee80211s_init(void)25 void ieee80211s_init(void)
26 {
27 mesh_allocated = 1;
28 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
29 0, 0, NULL);
30 }
31
ieee80211s_stop(void)32 void ieee80211s_stop(void)
33 {
34 if (!mesh_allocated)
35 return;
36 kmem_cache_destroy(rm_cache);
37 }
38
ieee80211_mesh_housekeeping_timer(struct timer_list * t)39 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t)
40 {
41 struct ieee80211_sub_if_data *sdata =
42 from_timer(sdata, t, u.mesh.housekeeping_timer);
43 struct ieee80211_local *local = sdata->local;
44 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
45
46 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
47
48 wiphy_work_queue(local->hw.wiphy, &sdata->work);
49 }
50
51 /**
52 * mesh_matches_local - check if the config of a mesh point matches ours
53 *
54 * @sdata: local mesh subif
55 * @ie: information elements of a management frame from the mesh peer
56 *
57 * This function checks if the mesh configuration of a mesh point matches the
58 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
59 */
mesh_matches_local(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * ie)60 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
61 struct ieee802_11_elems *ie)
62 {
63 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
64 u32 basic_rates = 0;
65 struct cfg80211_chan_def sta_chan_def;
66 struct ieee80211_supported_band *sband;
67 u32 vht_cap_info = 0;
68
69 /*
70 * As support for each feature is added, check for matching
71 * - On mesh config capabilities
72 * - Power Save Support En
73 * - Sync support enabled
74 * - Sync support active
75 * - Sync support required from peer
76 * - MDA enabled
77 * - Power management control on fc
78 */
79 if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
80 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
81 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
82 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
83 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
84 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
85 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
86 return false;
87
88 sband = ieee80211_get_sband(sdata);
89 if (!sband)
90 return false;
91
92 ieee80211_sta_get_rates(sdata, ie, sband->band,
93 &basic_rates);
94
95 if (sdata->vif.bss_conf.basic_rates != basic_rates)
96 return false;
97
98 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
99 NL80211_CHAN_NO_HT);
100 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
101
102 if (ie->vht_cap_elem)
103 vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info);
104
105 ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
106 ie->vht_operation, ie->ht_operation,
107 &sta_chan_def);
108 ieee80211_chandef_he_6ghz_oper(sdata, ie->he_operation, ie->eht_operation,
109 &sta_chan_def);
110
111 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
112 &sta_chan_def))
113 return false;
114
115 return true;
116 }
117
118 /**
119 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
120 *
121 * @ie: information elements of a management frame from the mesh peer
122 */
mesh_peer_accepts_plinks(struct ieee802_11_elems * ie)123 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
124 {
125 return (ie->mesh_config->meshconf_cap &
126 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
127 }
128
129 /**
130 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
131 *
132 * @sdata: mesh interface in which mesh beacons are going to be updated
133 *
134 * Returns: beacon changed flag if the beacon content changed.
135 */
mesh_accept_plinks_update(struct ieee80211_sub_if_data * sdata)136 u64 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
137 {
138 bool free_plinks;
139 u64 changed = 0;
140
141 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
142 * the mesh interface might be able to establish plinks with peers that
143 * are already on the table but are not on PLINK_ESTAB state. However,
144 * in general the mesh interface is not accepting peer link requests
145 * from new peers, and that must be reflected in the beacon
146 */
147 free_plinks = mesh_plink_availables(sdata);
148
149 if (free_plinks != sdata->u.mesh.accepting_plinks) {
150 sdata->u.mesh.accepting_plinks = free_plinks;
151 changed = BSS_CHANGED_BEACON;
152 }
153
154 return changed;
155 }
156
157 /*
158 * mesh_sta_cleanup - clean up any mesh sta state
159 *
160 * @sta: mesh sta to clean up.
161 */
mesh_sta_cleanup(struct sta_info * sta)162 void mesh_sta_cleanup(struct sta_info *sta)
163 {
164 struct ieee80211_sub_if_data *sdata = sta->sdata;
165 u64 changed = mesh_plink_deactivate(sta);
166
167 if (changed)
168 ieee80211_mbss_info_change_notify(sdata, changed);
169 }
170
mesh_rmc_init(struct ieee80211_sub_if_data * sdata)171 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
172 {
173 int i;
174
175 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
176 if (!sdata->u.mesh.rmc)
177 return -ENOMEM;
178 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
179 for (i = 0; i < RMC_BUCKETS; i++)
180 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
181 return 0;
182 }
183
mesh_rmc_free(struct ieee80211_sub_if_data * sdata)184 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
185 {
186 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
187 struct rmc_entry *p;
188 struct hlist_node *n;
189 int i;
190
191 if (!sdata->u.mesh.rmc)
192 return;
193
194 for (i = 0; i < RMC_BUCKETS; i++) {
195 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
196 hlist_del(&p->list);
197 kmem_cache_free(rm_cache, p);
198 }
199 }
200
201 kfree(rmc);
202 sdata->u.mesh.rmc = NULL;
203 }
204
205 /**
206 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
207 *
208 * @sdata: interface
209 * @sa: source address
210 * @mesh_hdr: mesh_header
211 *
212 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
213 *
214 * Checks using the source address and the mesh sequence number if we have
215 * received this frame lately. If the frame is not in the cache, it is added to
216 * it.
217 */
mesh_rmc_check(struct ieee80211_sub_if_data * sdata,const u8 * sa,struct ieee80211s_hdr * mesh_hdr)218 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
219 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
220 {
221 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
222 u32 seqnum = 0;
223 int entries = 0;
224 u8 idx;
225 struct rmc_entry *p;
226 struct hlist_node *n;
227
228 if (!rmc)
229 return -1;
230
231 /* Don't care about endianness since only match matters */
232 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
233 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
234 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
235 ++entries;
236 if (time_after(jiffies, p->exp_time) ||
237 entries == RMC_QUEUE_MAX_LEN) {
238 hlist_del(&p->list);
239 kmem_cache_free(rm_cache, p);
240 --entries;
241 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
242 return -1;
243 }
244
245 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
246 if (!p)
247 return 0;
248
249 p->seqnum = seqnum;
250 p->exp_time = jiffies + RMC_TIMEOUT;
251 memcpy(p->sa, sa, ETH_ALEN);
252 hlist_add_head(&p->list, &rmc->bucket[idx]);
253 return 0;
254 }
255
mesh_add_meshconf_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)256 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
257 struct sk_buff *skb)
258 {
259 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
260 u8 *pos, neighbors;
261 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
262 bool is_connected_to_gate = ifmsh->num_gates > 0 ||
263 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
264 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
265 bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
266
267 if (skb_tailroom(skb) < 2 + meshconf_len)
268 return -ENOMEM;
269
270 pos = skb_put(skb, 2 + meshconf_len);
271 *pos++ = WLAN_EID_MESH_CONFIG;
272 *pos++ = meshconf_len;
273
274 /* save a pointer for quick updates in pre-tbtt */
275 ifmsh->meshconf_offset = pos - skb->data;
276
277 /* Active path selection protocol ID */
278 *pos++ = ifmsh->mesh_pp_id;
279 /* Active path selection metric ID */
280 *pos++ = ifmsh->mesh_pm_id;
281 /* Congestion control mode identifier */
282 *pos++ = ifmsh->mesh_cc_id;
283 /* Synchronization protocol identifier */
284 *pos++ = ifmsh->mesh_sp_id;
285 /* Authentication Protocol identifier */
286 *pos++ = ifmsh->mesh_auth_id;
287 /* Mesh Formation Info - number of neighbors */
288 neighbors = atomic_read(&ifmsh->estab_plinks);
289 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
290 *pos++ = (is_connected_to_as << 7) |
291 (neighbors << 1) |
292 is_connected_to_gate;
293 /* Mesh capability */
294 *pos = 0x00;
295 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
296 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
297 *pos |= ifmsh->accepting_plinks ?
298 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
299 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
300 *pos |= ifmsh->ps_peers_deep_sleep ?
301 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
302 return 0;
303 }
304
mesh_add_meshid_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)305 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
306 {
307 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
308 u8 *pos;
309
310 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
311 return -ENOMEM;
312
313 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
314 *pos++ = WLAN_EID_MESH_ID;
315 *pos++ = ifmsh->mesh_id_len;
316 if (ifmsh->mesh_id_len)
317 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
318
319 return 0;
320 }
321
mesh_add_awake_window_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)322 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
323 struct sk_buff *skb)
324 {
325 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
326 u8 *pos;
327
328 /* see IEEE802.11-2012 13.14.6 */
329 if (ifmsh->ps_peers_light_sleep == 0 &&
330 ifmsh->ps_peers_deep_sleep == 0 &&
331 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
332 return 0;
333
334 if (skb_tailroom(skb) < 4)
335 return -ENOMEM;
336
337 pos = skb_put(skb, 2 + 2);
338 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
339 *pos++ = 2;
340 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
341
342 return 0;
343 }
344
mesh_add_vendor_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)345 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
346 struct sk_buff *skb)
347 {
348 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
349 u8 offset, len;
350 const u8 *data;
351
352 if (!ifmsh->ie || !ifmsh->ie_len)
353 return 0;
354
355 /* fast-forward to vendor IEs */
356 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
357
358 if (offset < ifmsh->ie_len) {
359 len = ifmsh->ie_len - offset;
360 data = ifmsh->ie + offset;
361 if (skb_tailroom(skb) < len)
362 return -ENOMEM;
363 skb_put_data(skb, data, len);
364 }
365
366 return 0;
367 }
368
mesh_add_rsn_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)369 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
370 {
371 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
372 u8 len = 0;
373 const u8 *data;
374
375 if (!ifmsh->ie || !ifmsh->ie_len)
376 return 0;
377
378 /* find RSN IE */
379 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
380 if (!data)
381 return 0;
382
383 len = data[1] + 2;
384
385 if (skb_tailroom(skb) < len)
386 return -ENOMEM;
387 skb_put_data(skb, data, len);
388
389 return 0;
390 }
391
mesh_add_ds_params_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)392 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
393 struct sk_buff *skb)
394 {
395 struct ieee80211_chanctx_conf *chanctx_conf;
396 struct ieee80211_channel *chan;
397 u8 *pos;
398
399 if (skb_tailroom(skb) < 3)
400 return -ENOMEM;
401
402 rcu_read_lock();
403 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
404 if (WARN_ON(!chanctx_conf)) {
405 rcu_read_unlock();
406 return -EINVAL;
407 }
408 chan = chanctx_conf->def.chan;
409 rcu_read_unlock();
410
411 pos = skb_put(skb, 2 + 1);
412 *pos++ = WLAN_EID_DS_PARAMS;
413 *pos++ = 1;
414 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
415
416 return 0;
417 }
418
mesh_add_ht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)419 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
420 struct sk_buff *skb)
421 {
422 struct ieee80211_supported_band *sband;
423 u8 *pos;
424
425 sband = ieee80211_get_sband(sdata);
426 if (!sband)
427 return -EINVAL;
428
429 /* HT not allowed in 6 GHz */
430 if (sband->band == NL80211_BAND_6GHZ)
431 return 0;
432
433 if (!sband->ht_cap.ht_supported ||
434 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
435 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
436 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
437 return 0;
438
439 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
440 return -ENOMEM;
441
442 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
443 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
444
445 return 0;
446 }
447
mesh_add_ht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)448 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
449 struct sk_buff *skb)
450 {
451 struct ieee80211_local *local = sdata->local;
452 struct ieee80211_chanctx_conf *chanctx_conf;
453 struct ieee80211_channel *channel;
454 struct ieee80211_supported_band *sband;
455 struct ieee80211_sta_ht_cap *ht_cap;
456 u8 *pos;
457
458 rcu_read_lock();
459 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
460 if (WARN_ON(!chanctx_conf)) {
461 rcu_read_unlock();
462 return -EINVAL;
463 }
464 channel = chanctx_conf->def.chan;
465 rcu_read_unlock();
466
467 sband = local->hw.wiphy->bands[channel->band];
468 ht_cap = &sband->ht_cap;
469
470 /* HT not allowed in 6 GHz */
471 if (sband->band == NL80211_BAND_6GHZ)
472 return 0;
473
474 if (!ht_cap->ht_supported ||
475 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
476 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
477 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
478 return 0;
479
480 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
481 return -ENOMEM;
482
483 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
484 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
485 sdata->vif.bss_conf.ht_operation_mode,
486 false);
487
488 return 0;
489 }
490
mesh_add_vht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)491 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
492 struct sk_buff *skb)
493 {
494 struct ieee80211_supported_band *sband;
495 u8 *pos;
496
497 sband = ieee80211_get_sband(sdata);
498 if (!sband)
499 return -EINVAL;
500
501 /* VHT not allowed in 6 GHz */
502 if (sband->band == NL80211_BAND_6GHZ)
503 return 0;
504
505 if (!sband->vht_cap.vht_supported ||
506 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
507 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
508 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
509 return 0;
510
511 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
512 return -ENOMEM;
513
514 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
515 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
516
517 return 0;
518 }
519
mesh_add_vht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)520 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
521 struct sk_buff *skb)
522 {
523 struct ieee80211_local *local = sdata->local;
524 struct ieee80211_chanctx_conf *chanctx_conf;
525 struct ieee80211_channel *channel;
526 struct ieee80211_supported_band *sband;
527 struct ieee80211_sta_vht_cap *vht_cap;
528 u8 *pos;
529
530 rcu_read_lock();
531 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
532 if (WARN_ON(!chanctx_conf)) {
533 rcu_read_unlock();
534 return -EINVAL;
535 }
536 channel = chanctx_conf->def.chan;
537 rcu_read_unlock();
538
539 sband = local->hw.wiphy->bands[channel->band];
540 vht_cap = &sband->vht_cap;
541
542 /* VHT not allowed in 6 GHz */
543 if (sband->band == NL80211_BAND_6GHZ)
544 return 0;
545
546 if (!vht_cap->vht_supported ||
547 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
548 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
549 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
550 return 0;
551
552 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
553 return -ENOMEM;
554
555 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
556 ieee80211_ie_build_vht_oper(pos, vht_cap,
557 &sdata->vif.bss_conf.chandef);
558
559 return 0;
560 }
561
mesh_add_he_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u8 ie_len)562 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
563 struct sk_buff *skb, u8 ie_len)
564 {
565 const struct ieee80211_sta_he_cap *he_cap;
566 struct ieee80211_supported_band *sband;
567 u8 *pos;
568
569 sband = ieee80211_get_sband(sdata);
570 if (!sband)
571 return -EINVAL;
572
573 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
574
575 if (!he_cap ||
576 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
577 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
578 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
579 return 0;
580
581 if (skb_tailroom(skb) < ie_len)
582 return -ENOMEM;
583
584 pos = skb_put(skb, ie_len);
585 ieee80211_ie_build_he_cap(0, pos, he_cap, pos + ie_len);
586
587 return 0;
588 }
589
mesh_add_he_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)590 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
591 struct sk_buff *skb)
592 {
593 const struct ieee80211_sta_he_cap *he_cap;
594 struct ieee80211_supported_band *sband;
595 u32 len;
596 u8 *pos;
597
598 sband = ieee80211_get_sband(sdata);
599 if (!sband)
600 return -EINVAL;
601
602 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
603 if (!he_cap ||
604 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
605 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
606 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
607 return 0;
608
609 len = 2 + 1 + sizeof(struct ieee80211_he_operation);
610 if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ)
611 len += sizeof(struct ieee80211_he_6ghz_oper);
612
613 if (skb_tailroom(skb) < len)
614 return -ENOMEM;
615
616 pos = skb_put(skb, len);
617 ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef);
618
619 return 0;
620 }
621
mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)622 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
623 struct sk_buff *skb)
624 {
625 struct ieee80211_supported_band *sband;
626 const struct ieee80211_sband_iftype_data *iftd;
627
628 sband = ieee80211_get_sband(sdata);
629 if (!sband)
630 return -EINVAL;
631
632 iftd = ieee80211_get_sband_iftype_data(sband,
633 NL80211_IFTYPE_MESH_POINT);
634 /* The device doesn't support HE in mesh mode or at all */
635 if (!iftd)
636 return 0;
637
638 ieee80211_ie_build_he_6ghz_cap(sdata, sdata->deflink.smps_mode, skb);
639 return 0;
640 }
641
mesh_add_eht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u8 ie_len)642 int mesh_add_eht_cap_ie(struct ieee80211_sub_if_data *sdata,
643 struct sk_buff *skb, u8 ie_len)
644 {
645 const struct ieee80211_sta_he_cap *he_cap;
646 const struct ieee80211_sta_eht_cap *eht_cap;
647 struct ieee80211_supported_band *sband;
648 u8 *pos;
649
650 sband = ieee80211_get_sband(sdata);
651 if (!sband)
652 return -EINVAL;
653
654 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
655 eht_cap = ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
656 if (!he_cap || !eht_cap ||
657 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
658 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
659 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
660 return 0;
661
662 if (skb_tailroom(skb) < ie_len)
663 return -ENOMEM;
664
665 pos = skb_put(skb, ie_len);
666 ieee80211_ie_build_eht_cap(pos, he_cap, eht_cap, pos + ie_len, false);
667
668 return 0;
669 }
670
mesh_add_eht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)671 int mesh_add_eht_oper_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
672 {
673 const struct ieee80211_sta_eht_cap *eht_cap;
674 struct ieee80211_supported_band *sband;
675 u32 len;
676 u8 *pos;
677
678 sband = ieee80211_get_sband(sdata);
679 if (!sband)
680 return -EINVAL;
681
682 eht_cap = ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
683 if (!eht_cap ||
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 0;
688
689 len = 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
690 offsetof(struct ieee80211_eht_operation_info, optional);
691
692 if (skb_tailroom(skb) < len)
693 return -ENOMEM;
694
695 pos = skb_put(skb, len);
696 ieee80211_ie_build_eht_oper(pos, &sdata->vif.bss_conf.chandef, eht_cap);
697
698 return 0;
699 }
700
ieee80211_mesh_path_timer(struct timer_list * t)701 static void ieee80211_mesh_path_timer(struct timer_list *t)
702 {
703 struct ieee80211_sub_if_data *sdata =
704 from_timer(sdata, t, u.mesh.mesh_path_timer);
705
706 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
707 }
708
ieee80211_mesh_path_root_timer(struct timer_list * t)709 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
710 {
711 struct ieee80211_sub_if_data *sdata =
712 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
713 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
714
715 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
716
717 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
718 }
719
ieee80211_mesh_root_setup(struct ieee80211_if_mesh * ifmsh)720 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
721 {
722 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
723 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
724 else {
725 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
726 /* stop running timer */
727 del_timer_sync(&ifmsh->mesh_path_root_timer);
728 }
729 }
730
731 static void
ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data * sdata,u8 * ie,u8 ie_len)732 ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
733 u8 *ie, u8 ie_len)
734 {
735 struct ieee80211_supported_band *sband;
736 const struct element *cap;
737 const struct ieee80211_he_operation *he_oper = NULL;
738
739 sband = ieee80211_get_sband(sdata);
740 if (!sband)
741 return;
742
743 if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) ||
744 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
745 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
746 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
747 return;
748
749 sdata->vif.bss_conf.he_support = true;
750
751 cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
752 if (cap && cap->datalen >= 1 + sizeof(*he_oper) &&
753 cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1))
754 he_oper = (void *)(cap->data + 1);
755
756 if (he_oper)
757 sdata->vif.bss_conf.he_oper.params =
758 __le32_to_cpu(he_oper->he_oper_params);
759
760 sdata->vif.bss_conf.eht_support =
761 !!ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
762 }
763
ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 ctrl_flags)764 bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
765 struct sk_buff *skb, u32 ctrl_flags)
766 {
767 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
768 struct ieee80211_mesh_fast_tx_key key = {
769 .type = MESH_FAST_TX_TYPE_LOCAL
770 };
771 struct ieee80211_mesh_fast_tx *entry;
772 struct ieee80211s_hdr *meshhdr;
773 u8 sa[ETH_ALEN] __aligned(2);
774 struct tid_ampdu_tx *tid_tx;
775 struct sta_info *sta;
776 bool copy_sa = false;
777 u16 ethertype;
778 u8 tid;
779
780 if (ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP)
781 return false;
782
783 if (ifmsh->mshcfg.dot11MeshNolearn)
784 return false;
785
786 /* Add support for these cases later */
787 if (ifmsh->ps_peers_light_sleep || ifmsh->ps_peers_deep_sleep)
788 return false;
789
790 if (is_multicast_ether_addr(skb->data))
791 return false;
792
793 ethertype = (skb->data[12] << 8) | skb->data[13];
794 if (ethertype < ETH_P_802_3_MIN)
795 return false;
796
797 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
798 return false;
799
800 if (skb->ip_summed == CHECKSUM_PARTIAL) {
801 skb_set_transport_header(skb, skb_checksum_start_offset(skb));
802 if (skb_checksum_help(skb))
803 return false;
804 }
805
806 ether_addr_copy(key.addr, skb->data);
807 if (!ether_addr_equal(skb->data + ETH_ALEN, sdata->vif.addr))
808 key.type = MESH_FAST_TX_TYPE_PROXIED;
809 entry = mesh_fast_tx_get(sdata, &key);
810 if (!entry)
811 return false;
812
813 if (skb_headroom(skb) < entry->hdrlen + entry->fast_tx.hdr_len)
814 return false;
815
816 sta = rcu_dereference(entry->mpath->next_hop);
817 if (!sta)
818 return false;
819
820 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
821 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
822 if (tid_tx) {
823 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
824 return false;
825 if (tid_tx->timeout)
826 tid_tx->last_tx = jiffies;
827 }
828
829 skb = skb_share_check(skb, GFP_ATOMIC);
830 if (!skb)
831 return true;
832
833 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb));
834
835 meshhdr = (struct ieee80211s_hdr *)entry->hdr;
836 if ((meshhdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) {
837 /* preserve SA from eth header for 6-addr frames */
838 ether_addr_copy(sa, skb->data + ETH_ALEN);
839 copy_sa = true;
840 }
841
842 memcpy(skb_push(skb, entry->hdrlen - 2 * ETH_ALEN), entry->hdr,
843 entry->hdrlen);
844
845 meshhdr = (struct ieee80211s_hdr *)skb->data;
846 put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
847 &meshhdr->seqnum);
848 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
849 if (copy_sa)
850 ether_addr_copy(meshhdr->eaddr2, sa);
851
852 skb_push(skb, 2 * ETH_ALEN);
853 __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
854 entry->mpath->dst, sdata->vif.addr);
855
856 return true;
857 }
858
859 /**
860 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
861 * @hdr: 802.11 frame header
862 * @fc: frame control field
863 * @meshda: destination address in the mesh
864 * @meshsa: source address in the mesh. Same as TA, as frame is
865 * locally originated.
866 *
867 * Return the length of the 802.11 (does not include a mesh control header)
868 */
ieee80211_fill_mesh_addresses(struct ieee80211_hdr * hdr,__le16 * fc,const u8 * meshda,const u8 * meshsa)869 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
870 const u8 *meshda, const u8 *meshsa)
871 {
872 if (is_multicast_ether_addr(meshda)) {
873 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
874 /* DA TA SA */
875 memcpy(hdr->addr1, meshda, ETH_ALEN);
876 memcpy(hdr->addr2, meshsa, ETH_ALEN);
877 memcpy(hdr->addr3, meshsa, ETH_ALEN);
878 return 24;
879 } else {
880 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
881 /* RA TA DA SA */
882 eth_zero_addr(hdr->addr1); /* RA is resolved later */
883 memcpy(hdr->addr2, meshsa, ETH_ALEN);
884 memcpy(hdr->addr3, meshda, ETH_ALEN);
885 memcpy(hdr->addr4, meshsa, ETH_ALEN);
886 return 30;
887 }
888 }
889
890 /**
891 * ieee80211_new_mesh_header - create a new mesh header
892 * @sdata: mesh interface to be used
893 * @meshhdr: uninitialized mesh header
894 * @addr4or5: 1st address in the ae header, which may correspond to address 4
895 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
896 * be NULL.
897 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
898 * mesh frame
899 *
900 * Return the header length.
901 */
ieee80211_new_mesh_header(struct ieee80211_sub_if_data * sdata,struct ieee80211s_hdr * meshhdr,const char * addr4or5,const char * addr6)902 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
903 struct ieee80211s_hdr *meshhdr,
904 const char *addr4or5, const char *addr6)
905 {
906 if (WARN_ON(!addr4or5 && addr6))
907 return 0;
908
909 memset(meshhdr, 0, sizeof(*meshhdr));
910
911 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
912
913 put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
914 &meshhdr->seqnum);
915 if (addr4or5 && !addr6) {
916 meshhdr->flags |= MESH_FLAGS_AE_A4;
917 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
918 return 2 * ETH_ALEN;
919 } else if (addr4or5 && addr6) {
920 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
921 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
922 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
923 return 3 * ETH_ALEN;
924 }
925
926 return ETH_ALEN;
927 }
928
ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data * sdata)929 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
930 {
931 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
932 u64 changed;
933
934 if (ifmsh->mshcfg.plink_timeout > 0)
935 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
936 mesh_path_expire(sdata);
937
938 changed = mesh_accept_plinks_update(sdata);
939 ieee80211_mbss_info_change_notify(sdata, changed);
940
941 mesh_fast_tx_gc(sdata);
942
943 mod_timer(&ifmsh->housekeeping_timer,
944 round_jiffies(jiffies +
945 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
946 }
947
ieee80211_mesh_rootpath(struct ieee80211_sub_if_data * sdata)948 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
949 {
950 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
951 u32 interval;
952
953 mesh_path_tx_root_frame(sdata);
954
955 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
956 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
957 else
958 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
959
960 mod_timer(&ifmsh->mesh_path_root_timer,
961 round_jiffies(TU_TO_EXP_TIME(interval)));
962 }
963
964 static int
ieee80211_mesh_build_beacon(struct ieee80211_if_mesh * ifmsh)965 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
966 {
967 struct beacon_data *bcn;
968 int head_len, tail_len;
969 struct sk_buff *skb;
970 struct ieee80211_mgmt *mgmt;
971 struct ieee80211_chanctx_conf *chanctx_conf;
972 struct mesh_csa_settings *csa;
973 enum nl80211_band band;
974 u8 ie_len_he_cap, ie_len_eht_cap;
975 u8 *pos;
976 struct ieee80211_sub_if_data *sdata;
977 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
978
979 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
980 rcu_read_lock();
981 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
982 band = chanctx_conf->def.chan->band;
983 rcu_read_unlock();
984
985 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
986 NL80211_IFTYPE_MESH_POINT);
987 ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata,
988 NL80211_IFTYPE_MESH_POINT);
989 head_len = hdr_len +
990 2 + /* NULL SSID */
991 /* Channel Switch Announcement */
992 2 + sizeof(struct ieee80211_channel_sw_ie) +
993 /* Mesh Channel Switch Parameters */
994 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
995 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
996 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
997 2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
998 2 + 8 + /* supported rates */
999 2 + 3; /* DS params */
1000 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
1001 2 + sizeof(struct ieee80211_ht_cap) +
1002 2 + sizeof(struct ieee80211_ht_operation) +
1003 2 + ifmsh->mesh_id_len +
1004 2 + sizeof(struct ieee80211_meshconf_ie) +
1005 2 + sizeof(__le16) + /* awake window */
1006 2 + sizeof(struct ieee80211_vht_cap) +
1007 2 + sizeof(struct ieee80211_vht_operation) +
1008 ie_len_he_cap +
1009 2 + 1 + sizeof(struct ieee80211_he_operation) +
1010 sizeof(struct ieee80211_he_6ghz_oper) +
1011 2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
1012 ie_len_eht_cap +
1013 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
1014 offsetof(struct ieee80211_eht_operation_info, optional) +
1015 ifmsh->ie_len;
1016
1017 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
1018 /* need an skb for IE builders to operate on */
1019 skb = __dev_alloc_skb(max(head_len, tail_len), GFP_KERNEL);
1020
1021 if (!bcn || !skb)
1022 goto out_free;
1023
1024 /*
1025 * pointers go into the block we allocated,
1026 * memory is | beacon_data | head | tail |
1027 */
1028 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
1029
1030 /* fill in the head */
1031 mgmt = skb_put_zero(skb, hdr_len);
1032 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1033 IEEE80211_STYPE_BEACON);
1034 eth_broadcast_addr(mgmt->da);
1035 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1036 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
1037 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
1038 mgmt->u.beacon.beacon_int =
1039 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
1040 mgmt->u.beacon.capab_info |= cpu_to_le16(
1041 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
1042
1043 pos = skb_put(skb, 2);
1044 *pos++ = WLAN_EID_SSID;
1045 *pos++ = 0x0;
1046
1047 rcu_read_lock();
1048 csa = rcu_dereference(ifmsh->csa);
1049 if (csa) {
1050 enum nl80211_channel_type ct;
1051 struct cfg80211_chan_def *chandef;
1052 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
1053 2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
1054
1055 pos = skb_put_zero(skb, ie_len);
1056 *pos++ = WLAN_EID_CHANNEL_SWITCH;
1057 *pos++ = 3;
1058 *pos++ = 0x0;
1059 *pos++ = ieee80211_frequency_to_channel(
1060 csa->settings.chandef.chan->center_freq);
1061 bcn->cntdwn_current_counter = csa->settings.count;
1062 bcn->cntdwn_counter_offsets[0] = hdr_len + 6;
1063 *pos++ = csa->settings.count;
1064 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
1065 *pos++ = 6;
1066 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
1067 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
1068 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1069 } else {
1070 *pos++ = ifmsh->chsw_ttl;
1071 }
1072 *pos++ |= csa->settings.block_tx ?
1073 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
1074 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
1075 pos += 2;
1076 put_unaligned_le16(ifmsh->pre_value, pos);
1077 pos += 2;
1078
1079 switch (csa->settings.chandef.width) {
1080 case NL80211_CHAN_WIDTH_40:
1081 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1082 pos = skb_put_zero(skb, ie_len);
1083
1084 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
1085 *pos++ = 1; /* len */
1086 ct = cfg80211_get_chandef_type(&csa->settings.chandef);
1087 if (ct == NL80211_CHAN_HT40PLUS)
1088 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1089 else
1090 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1091 break;
1092 case NL80211_CHAN_WIDTH_80:
1093 case NL80211_CHAN_WIDTH_80P80:
1094 case NL80211_CHAN_WIDTH_160:
1095 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
1096 ie_len = 2 + 2 +
1097 sizeof(struct ieee80211_wide_bw_chansw_ie);
1098 pos = skb_put_zero(skb, ie_len);
1099
1100 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
1101 *pos++ = 5; /* len */
1102 /* put sub IE */
1103 chandef = &csa->settings.chandef;
1104 ieee80211_ie_build_wide_bw_cs(pos, chandef);
1105 break;
1106 default:
1107 break;
1108 }
1109 }
1110 rcu_read_unlock();
1111
1112 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
1113 mesh_add_ds_params_ie(sdata, skb))
1114 goto out_free;
1115
1116 bcn->head_len = skb->len;
1117 memcpy(bcn->head, skb->data, bcn->head_len);
1118
1119 /* now the tail */
1120 skb_trim(skb, 0);
1121 bcn->tail = bcn->head + bcn->head_len;
1122
1123 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
1124 mesh_add_rsn_ie(sdata, skb) ||
1125 mesh_add_ht_cap_ie(sdata, skb) ||
1126 mesh_add_ht_oper_ie(sdata, skb) ||
1127 mesh_add_meshid_ie(sdata, skb) ||
1128 mesh_add_meshconf_ie(sdata, skb) ||
1129 mesh_add_awake_window_ie(sdata, skb) ||
1130 mesh_add_vht_cap_ie(sdata, skb) ||
1131 mesh_add_vht_oper_ie(sdata, skb) ||
1132 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
1133 mesh_add_he_oper_ie(sdata, skb) ||
1134 mesh_add_he_6ghz_cap_ie(sdata, skb) ||
1135 mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
1136 mesh_add_eht_oper_ie(sdata, skb) ||
1137 mesh_add_vendor_ies(sdata, skb))
1138 goto out_free;
1139
1140 bcn->tail_len = skb->len;
1141 memcpy(bcn->tail, skb->data, bcn->tail_len);
1142 ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len);
1143 bcn->meshconf = (struct ieee80211_meshconf_ie *)
1144 (bcn->tail + ifmsh->meshconf_offset);
1145
1146 dev_kfree_skb(skb);
1147 rcu_assign_pointer(ifmsh->beacon, bcn);
1148 return 0;
1149 out_free:
1150 kfree(bcn);
1151 dev_kfree_skb(skb);
1152 return -ENOMEM;
1153 }
1154
1155 static int
ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data * sdata)1156 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
1157 {
1158 struct beacon_data *old_bcn;
1159 int ret;
1160
1161 old_bcn = sdata_dereference(sdata->u.mesh.beacon, sdata);
1162 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
1163 if (ret)
1164 /* just reuse old beacon */
1165 return ret;
1166
1167 if (old_bcn)
1168 kfree_rcu(old_bcn, rcu_head);
1169 return 0;
1170 }
1171
ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data * sdata,u64 changed)1172 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1173 u64 changed)
1174 {
1175 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1176 unsigned long bits = changed;
1177 u32 bit;
1178
1179 if (!bits)
1180 return;
1181
1182 /* if we race with running work, worst case this work becomes a noop */
1183 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
1184 set_bit(bit, ifmsh->mbss_changed);
1185 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
1186 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1187 }
1188
ieee80211_start_mesh(struct ieee80211_sub_if_data * sdata)1189 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
1190 {
1191 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1192 struct ieee80211_local *local = sdata->local;
1193 u64 changed = BSS_CHANGED_BEACON |
1194 BSS_CHANGED_BEACON_ENABLED |
1195 BSS_CHANGED_HT |
1196 BSS_CHANGED_BASIC_RATES |
1197 BSS_CHANGED_BEACON_INT |
1198 BSS_CHANGED_MCAST_RATE;
1199
1200 local->fif_other_bss++;
1201 /* mesh ifaces must set allmulti to forward mcast traffic */
1202 atomic_inc(&local->iff_allmultis);
1203 ieee80211_configure_filter(local);
1204
1205 ifmsh->mesh_cc_id = 0; /* Disabled */
1206 /* register sync ops from extensible synchronization framework */
1207 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1208 ifmsh->sync_offset_clockdrift_max = 0;
1209 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1210 ieee80211_mesh_root_setup(ifmsh);
1211 wiphy_work_queue(local->hw.wiphy, &sdata->work);
1212 sdata->vif.bss_conf.ht_operation_mode =
1213 ifmsh->mshcfg.ht_opmode;
1214 sdata->vif.bss_conf.enable_beacon = true;
1215
1216 changed |= ieee80211_mps_local_status_update(sdata);
1217
1218 if (ieee80211_mesh_build_beacon(ifmsh)) {
1219 ieee80211_stop_mesh(sdata);
1220 return -ENOMEM;
1221 }
1222
1223 ieee80211_recalc_dtim(local, sdata);
1224 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1225
1226 netif_carrier_on(sdata->dev);
1227 return 0;
1228 }
1229
ieee80211_stop_mesh(struct ieee80211_sub_if_data * sdata)1230 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1231 {
1232 struct ieee80211_local *local = sdata->local;
1233 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1234 struct beacon_data *bcn;
1235
1236 netif_carrier_off(sdata->dev);
1237
1238 /* flush STAs and mpaths on this iface */
1239 sta_info_flush(sdata);
1240 ieee80211_free_keys(sdata, true);
1241 mesh_path_flush_by_iface(sdata);
1242
1243 /* stop the beacon */
1244 ifmsh->mesh_id_len = 0;
1245 sdata->vif.bss_conf.enable_beacon = false;
1246 sdata->beacon_rate_set = false;
1247 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1248 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1249 BSS_CHANGED_BEACON_ENABLED);
1250
1251 /* remove beacon */
1252 bcn = sdata_dereference(ifmsh->beacon, sdata);
1253 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1254 kfree_rcu(bcn, rcu_head);
1255
1256 /* free all potentially still buffered group-addressed frames */
1257 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1258 skb_queue_purge(&ifmsh->ps.bc_buf);
1259
1260 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1261 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1262 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1263
1264 /* clear any mesh work (for next join) we may have accrued */
1265 ifmsh->wrkq_flags = 0;
1266 memset(ifmsh->mbss_changed, 0, sizeof(ifmsh->mbss_changed));
1267
1268 local->fif_other_bss--;
1269 atomic_dec(&local->iff_allmultis);
1270 ieee80211_configure_filter(local);
1271 }
1272
ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data * sdata)1273 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1274 {
1275 int err;
1276
1277 /* if the current channel is a DFS channel, mark the channel as
1278 * unavailable.
1279 */
1280 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1281 &sdata->vif.bss_conf.chandef,
1282 NL80211_IFTYPE_MESH_POINT);
1283 if (err > 0)
1284 cfg80211_radar_event(sdata->local->hw.wiphy,
1285 &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1286 }
1287
1288 static bool
ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)1289 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1290 struct ieee802_11_elems *elems, bool beacon)
1291 {
1292 struct cfg80211_csa_settings params;
1293 struct ieee80211_csa_ie csa_ie;
1294 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1295 struct ieee80211_supported_band *sband;
1296 int err;
1297 ieee80211_conn_flags_t conn_flags = 0;
1298 u32 vht_cap_info = 0;
1299
1300 sdata_assert_lock(sdata);
1301
1302 sband = ieee80211_get_sband(sdata);
1303 if (!sband)
1304 return false;
1305
1306 switch (sdata->vif.bss_conf.chandef.width) {
1307 case NL80211_CHAN_WIDTH_20_NOHT:
1308 conn_flags |= IEEE80211_CONN_DISABLE_HT;
1309 fallthrough;
1310 case NL80211_CHAN_WIDTH_20:
1311 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
1312 fallthrough;
1313 case NL80211_CHAN_WIDTH_40:
1314 conn_flags |= IEEE80211_CONN_DISABLE_VHT;
1315 break;
1316 default:
1317 break;
1318 }
1319
1320 if (elems->vht_cap_elem)
1321 vht_cap_info =
1322 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1323
1324 memset(¶ms, 0, sizeof(params));
1325 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1326 vht_cap_info,
1327 conn_flags, sdata->vif.addr,
1328 &csa_ie);
1329 if (err < 0)
1330 return false;
1331 if (err)
1332 return false;
1333
1334 /* Mark the channel unavailable if the reason for the switch is
1335 * regulatory.
1336 */
1337 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1338 ieee80211_mesh_csa_mark_radar(sdata);
1339
1340 params.chandef = csa_ie.chandef;
1341 params.count = csa_ie.count;
1342
1343 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
1344 IEEE80211_CHAN_DISABLED) ||
1345 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
1346 NL80211_IFTYPE_MESH_POINT)) {
1347 sdata_info(sdata,
1348 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1349 sdata->vif.addr,
1350 params.chandef.chan->center_freq,
1351 params.chandef.width,
1352 params.chandef.center_freq1,
1353 params.chandef.center_freq2);
1354 return false;
1355 }
1356
1357 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1358 ¶ms.chandef,
1359 NL80211_IFTYPE_MESH_POINT);
1360 if (err < 0)
1361 return false;
1362 if (err > 0 && !ifmsh->userspace_handles_dfs) {
1363 sdata_info(sdata,
1364 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1365 sdata->vif.addr,
1366 params.chandef.chan->center_freq,
1367 params.chandef.width,
1368 params.chandef.center_freq1,
1369 params.chandef.center_freq2);
1370 return false;
1371 }
1372
1373 params.radar_required = err;
1374
1375 if (cfg80211_chandef_identical(¶ms.chandef,
1376 &sdata->vif.bss_conf.chandef)) {
1377 mcsa_dbg(sdata,
1378 "received csa with an identical chandef, ignoring\n");
1379 return true;
1380 }
1381
1382 mcsa_dbg(sdata,
1383 "received channel switch announcement to go to channel %d MHz\n",
1384 params.chandef.chan->center_freq);
1385
1386 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1387 if (beacon) {
1388 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1389 if (ifmsh->pre_value >= csa_ie.pre_value)
1390 return false;
1391 ifmsh->pre_value = csa_ie.pre_value;
1392 }
1393
1394 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1395 return false;
1396
1397 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1398
1399 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1400 ¶ms) < 0)
1401 return false;
1402
1403 return true;
1404 }
1405
1406 static void
ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1407 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1408 struct ieee80211_mgmt *mgmt, size_t len)
1409 {
1410 struct ieee80211_local *local = sdata->local;
1411 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1412 struct sk_buff *presp;
1413 struct beacon_data *bcn;
1414 struct ieee80211_mgmt *hdr;
1415 struct ieee802_11_elems *elems;
1416 size_t baselen;
1417 u8 *pos;
1418
1419 pos = mgmt->u.probe_req.variable;
1420 baselen = (u8 *) pos - (u8 *) mgmt;
1421 if (baselen > len)
1422 return;
1423
1424 elems = ieee802_11_parse_elems(pos, len - baselen, false, NULL);
1425 if (!elems)
1426 return;
1427
1428 if (!elems->mesh_id)
1429 goto free;
1430
1431 /* 802.11-2012 10.1.4.3.2 */
1432 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1433 !is_broadcast_ether_addr(mgmt->da)) ||
1434 elems->ssid_len != 0)
1435 goto free;
1436
1437 if (elems->mesh_id_len != 0 &&
1438 (elems->mesh_id_len != ifmsh->mesh_id_len ||
1439 memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1440 goto free;
1441
1442 rcu_read_lock();
1443 bcn = rcu_dereference(ifmsh->beacon);
1444
1445 if (!bcn)
1446 goto out;
1447
1448 presp = dev_alloc_skb(local->tx_headroom +
1449 bcn->head_len + bcn->tail_len);
1450 if (!presp)
1451 goto out;
1452
1453 skb_reserve(presp, local->tx_headroom);
1454 skb_put_data(presp, bcn->head, bcn->head_len);
1455 skb_put_data(presp, bcn->tail, bcn->tail_len);
1456 hdr = (struct ieee80211_mgmt *) presp->data;
1457 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1458 IEEE80211_STYPE_PROBE_RESP);
1459 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1460 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1461 ieee80211_tx_skb(sdata, presp);
1462 out:
1463 rcu_read_unlock();
1464 free:
1465 kfree(elems);
1466 }
1467
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)1468 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1469 u16 stype,
1470 struct ieee80211_mgmt *mgmt,
1471 size_t len,
1472 struct ieee80211_rx_status *rx_status)
1473 {
1474 struct ieee80211_local *local = sdata->local;
1475 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1476 struct ieee802_11_elems *elems;
1477 struct ieee80211_channel *channel;
1478 size_t baselen;
1479 int freq;
1480 enum nl80211_band band = rx_status->band;
1481
1482 /* ignore ProbeResp to foreign address */
1483 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1484 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1485 return;
1486
1487 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1488 if (baselen > len)
1489 return;
1490
1491 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1492 len - baselen,
1493 false, NULL);
1494 if (!elems)
1495 return;
1496
1497 /* ignore non-mesh or secure / unsecure mismatch */
1498 if ((!elems->mesh_id || !elems->mesh_config) ||
1499 (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1500 (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1501 goto free;
1502
1503 if (elems->ds_params)
1504 freq = ieee80211_channel_to_frequency(elems->ds_params[0], band);
1505 else
1506 freq = rx_status->freq;
1507
1508 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1509
1510 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1511 goto free;
1512
1513 if (mesh_matches_local(sdata, elems)) {
1514 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1515 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1516 if (!sdata->u.mesh.user_mpm ||
1517 sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1518 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1519 mesh_neighbour_update(sdata, mgmt->sa, elems,
1520 rx_status);
1521
1522 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1523 !sdata->vif.bss_conf.csa_active)
1524 ieee80211_mesh_process_chnswitch(sdata, elems, true);
1525 }
1526
1527 if (ifmsh->sync_ops)
1528 ifmsh->sync_ops->rx_bcn_presp(sdata, stype, mgmt, len,
1529 elems->mesh_config, rx_status);
1530 free:
1531 kfree(elems);
1532 }
1533
ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data * sdata,u64 * changed)1534 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
1535 {
1536 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1537 struct mesh_csa_settings *tmp_csa_settings;
1538 int ret = 0;
1539
1540 /* Reset the TTL value and Initiator flag */
1541 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1542 ifmsh->chsw_ttl = 0;
1543
1544 /* Remove the CSA and MCSP elements from the beacon */
1545 tmp_csa_settings = sdata_dereference(ifmsh->csa, sdata);
1546 RCU_INIT_POINTER(ifmsh->csa, NULL);
1547 if (tmp_csa_settings)
1548 kfree_rcu(tmp_csa_settings, rcu_head);
1549 ret = ieee80211_mesh_rebuild_beacon(sdata);
1550 if (ret)
1551 return -EINVAL;
1552
1553 *changed |= BSS_CHANGED_BEACON;
1554
1555 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1556 sdata->vif.bss_conf.chandef.chan->center_freq);
1557 return 0;
1558 }
1559
ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings,u64 * changed)1560 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1561 struct cfg80211_csa_settings *csa_settings,
1562 u64 *changed)
1563 {
1564 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1565 struct mesh_csa_settings *tmp_csa_settings;
1566 int ret = 0;
1567
1568 lockdep_assert_held(&sdata->wdev.mtx);
1569
1570 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1571 GFP_ATOMIC);
1572 if (!tmp_csa_settings)
1573 return -ENOMEM;
1574
1575 memcpy(&tmp_csa_settings->settings, csa_settings,
1576 sizeof(struct cfg80211_csa_settings));
1577
1578 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1579
1580 ret = ieee80211_mesh_rebuild_beacon(sdata);
1581 if (ret) {
1582 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1583 RCU_INIT_POINTER(ifmsh->csa, NULL);
1584 kfree_rcu(tmp_csa_settings, rcu_head);
1585 return ret;
1586 }
1587
1588 *changed |= BSS_CHANGED_BEACON;
1589 return 0;
1590 }
1591
mesh_fwd_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee802_11_elems * elems)1592 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1593 struct ieee80211_mgmt *mgmt, size_t len,
1594 struct ieee802_11_elems *elems)
1595 {
1596 struct ieee80211_mgmt *mgmt_fwd;
1597 struct sk_buff *skb;
1598 struct ieee80211_local *local = sdata->local;
1599
1600 skb = dev_alloc_skb(local->tx_headroom + len);
1601 if (!skb)
1602 return -ENOMEM;
1603 skb_reserve(skb, local->tx_headroom);
1604 mgmt_fwd = skb_put(skb, len);
1605
1606 elems->mesh_chansw_params_ie->mesh_ttl--;
1607 elems->mesh_chansw_params_ie->mesh_flags &=
1608 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1609
1610 memcpy(mgmt_fwd, mgmt, len);
1611 eth_broadcast_addr(mgmt_fwd->da);
1612 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1613 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1614
1615 ieee80211_tx_skb(sdata, skb);
1616 return 0;
1617 }
1618
mesh_rx_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1619 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1620 struct ieee80211_mgmt *mgmt, size_t len)
1621 {
1622 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1623 struct ieee802_11_elems *elems;
1624 u16 pre_value;
1625 bool fwd_csa = true;
1626 size_t baselen;
1627 u8 *pos;
1628
1629 if (mgmt->u.action.u.measurement.action_code !=
1630 WLAN_ACTION_SPCT_CHL_SWITCH)
1631 return;
1632
1633 pos = mgmt->u.action.u.chan_switch.variable;
1634 baselen = offsetof(struct ieee80211_mgmt,
1635 u.action.u.chan_switch.variable);
1636 elems = ieee802_11_parse_elems(pos, len - baselen, true, NULL);
1637 if (!elems)
1638 return;
1639
1640 if (!mesh_matches_local(sdata, elems))
1641 goto free;
1642
1643 ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl;
1644 if (!--ifmsh->chsw_ttl)
1645 fwd_csa = false;
1646
1647 pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value);
1648 if (ifmsh->pre_value >= pre_value)
1649 goto free;
1650
1651 ifmsh->pre_value = pre_value;
1652
1653 if (!sdata->vif.bss_conf.csa_active &&
1654 !ieee80211_mesh_process_chnswitch(sdata, elems, false)) {
1655 mcsa_dbg(sdata, "Failed to process CSA action frame");
1656 goto free;
1657 }
1658
1659 /* forward or re-broadcast the CSA frame */
1660 if (fwd_csa) {
1661 if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0)
1662 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1663 }
1664 free:
1665 kfree(elems);
1666 }
1667
ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1668 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1669 struct ieee80211_mgmt *mgmt,
1670 size_t len,
1671 struct ieee80211_rx_status *rx_status)
1672 {
1673 switch (mgmt->u.action.category) {
1674 case WLAN_CATEGORY_SELF_PROTECTED:
1675 switch (mgmt->u.action.u.self_prot.action_code) {
1676 case WLAN_SP_MESH_PEERING_OPEN:
1677 case WLAN_SP_MESH_PEERING_CLOSE:
1678 case WLAN_SP_MESH_PEERING_CONFIRM:
1679 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1680 break;
1681 }
1682 break;
1683 case WLAN_CATEGORY_MESH_ACTION:
1684 if (mesh_action_is_path_sel(mgmt))
1685 mesh_rx_path_sel_frame(sdata, mgmt, len);
1686 break;
1687 case WLAN_CATEGORY_SPECTRUM_MGMT:
1688 mesh_rx_csa_frame(sdata, mgmt, len);
1689 break;
1690 }
1691 }
1692
ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1693 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1694 struct sk_buff *skb)
1695 {
1696 struct ieee80211_rx_status *rx_status;
1697 struct ieee80211_mgmt *mgmt;
1698 u16 stype;
1699
1700 sdata_lock(sdata);
1701
1702 /* mesh already went down */
1703 if (!sdata->u.mesh.mesh_id_len)
1704 goto out;
1705
1706 rx_status = IEEE80211_SKB_RXCB(skb);
1707 mgmt = (struct ieee80211_mgmt *) skb->data;
1708 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1709
1710 switch (stype) {
1711 case IEEE80211_STYPE_PROBE_RESP:
1712 case IEEE80211_STYPE_BEACON:
1713 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1714 rx_status);
1715 break;
1716 case IEEE80211_STYPE_PROBE_REQ:
1717 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1718 break;
1719 case IEEE80211_STYPE_ACTION:
1720 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1721 break;
1722 }
1723 out:
1724 sdata_unlock(sdata);
1725 }
1726
mesh_bss_info_changed(struct ieee80211_sub_if_data * sdata)1727 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1728 {
1729 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1730 u32 bit;
1731 u64 changed = 0;
1732
1733 for_each_set_bit(bit, ifmsh->mbss_changed,
1734 sizeof(changed) * BITS_PER_BYTE) {
1735 clear_bit(bit, ifmsh->mbss_changed);
1736 changed |= BIT(bit);
1737 }
1738
1739 if (sdata->vif.bss_conf.enable_beacon &&
1740 (changed & (BSS_CHANGED_BEACON |
1741 BSS_CHANGED_HT |
1742 BSS_CHANGED_BASIC_RATES |
1743 BSS_CHANGED_BEACON_INT)))
1744 if (ieee80211_mesh_rebuild_beacon(sdata))
1745 return;
1746
1747 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1748 }
1749
ieee80211_mesh_work(struct ieee80211_sub_if_data * sdata)1750 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1751 {
1752 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1753
1754 sdata_lock(sdata);
1755
1756 /* mesh already went down */
1757 if (!sdata->u.mesh.mesh_id_len)
1758 goto out;
1759
1760 if (ifmsh->preq_queue_len &&
1761 time_after(jiffies,
1762 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1763 mesh_path_start_discovery(sdata);
1764
1765 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1766 ieee80211_mesh_housekeeping(sdata);
1767
1768 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1769 ieee80211_mesh_rootpath(sdata);
1770
1771 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1772 mesh_sync_adjust_tsf(sdata);
1773
1774 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1775 mesh_bss_info_changed(sdata);
1776 out:
1777 sdata_unlock(sdata);
1778 }
1779
1780
ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data * sdata)1781 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1782 {
1783 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1784 static u8 zero_addr[ETH_ALEN] = {};
1785
1786 timer_setup(&ifmsh->housekeeping_timer,
1787 ieee80211_mesh_housekeeping_timer, 0);
1788
1789 ifmsh->accepting_plinks = true;
1790 atomic_set(&ifmsh->mpaths, 0);
1791 mesh_rmc_init(sdata);
1792 ifmsh->last_preq = jiffies;
1793 ifmsh->next_perr = jiffies;
1794 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1795 ifmsh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
1796 /* Allocate all mesh structures when creating the first mesh interface. */
1797 if (!mesh_allocated)
1798 ieee80211s_init();
1799
1800 mesh_pathtbl_init(sdata);
1801
1802 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1803 timer_setup(&ifmsh->mesh_path_root_timer,
1804 ieee80211_mesh_path_root_timer, 0);
1805 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1806 skb_queue_head_init(&ifmsh->ps.bc_buf);
1807 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1808 spin_lock_init(&ifmsh->sync_offset_lock);
1809 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1810
1811 sdata->vif.bss_conf.bssid = zero_addr;
1812 }
1813
ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data * sdata)1814 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1815 {
1816 mesh_rmc_free(sdata);
1817 mesh_pathtbl_unregister(sdata);
1818 }
1819