1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2018 - 2019 Intel Corporation
5 * Authors: Luis Carlos Cobo <luisca@cozybit.com>
6 * Javier Cardona <javier@cozybit.com>
7 */
8
9 #include <linux/slab.h>
10 #include <asm/unaligned.h>
11 #include "ieee80211_i.h"
12 #include "mesh.h"
13 #include "driver-ops.h"
14
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
67 /*
68 * As support for each feature is added, check for matching
69 * - On mesh config capabilities
70 * - Power Save Support En
71 * - Sync support enabled
72 * - Sync support active
73 * - Sync support required from peer
74 * - MDA enabled
75 * - Power management control on fc
76 */
77 if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
78 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
79 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
80 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
81 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
82 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
83 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
84 return false;
85
86 sband = ieee80211_get_sband(sdata);
87 if (!sband)
88 return false;
89
90 ieee80211_sta_get_rates(sdata, ie, sband->band,
91 &basic_rates);
92
93 if (sdata->vif.bss_conf.basic_rates != basic_rates)
94 return false;
95
96 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
97 NL80211_CHAN_NO_HT);
98 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
99 ieee80211_chandef_vht_oper(&sdata->local->hw,
100 ie->vht_operation, ie->ht_operation,
101 &sta_chan_def);
102
103 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
104 &sta_chan_def))
105 return false;
106
107 return true;
108 }
109
110 /**
111 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
112 *
113 * @ie: information elements of a management frame from the mesh peer
114 */
mesh_peer_accepts_plinks(struct ieee802_11_elems * ie)115 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
116 {
117 return (ie->mesh_config->meshconf_cap &
118 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
119 }
120
121 /**
122 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
123 *
124 * @sdata: mesh interface in which mesh beacons are going to be updated
125 *
126 * Returns: beacon changed flag if the beacon content changed.
127 */
mesh_accept_plinks_update(struct ieee80211_sub_if_data * sdata)128 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
129 {
130 bool free_plinks;
131 u32 changed = 0;
132
133 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
134 * the mesh interface might be able to establish plinks with peers that
135 * are already on the table but are not on PLINK_ESTAB state. However,
136 * in general the mesh interface is not accepting peer link requests
137 * from new peers, and that must be reflected in the beacon
138 */
139 free_plinks = mesh_plink_availables(sdata);
140
141 if (free_plinks != sdata->u.mesh.accepting_plinks) {
142 sdata->u.mesh.accepting_plinks = free_plinks;
143 changed = BSS_CHANGED_BEACON;
144 }
145
146 return changed;
147 }
148
149 /*
150 * mesh_sta_cleanup - clean up any mesh sta state
151 *
152 * @sta: mesh sta to clean up.
153 */
mesh_sta_cleanup(struct sta_info * sta)154 void mesh_sta_cleanup(struct sta_info *sta)
155 {
156 struct ieee80211_sub_if_data *sdata = sta->sdata;
157 u32 changed = mesh_plink_deactivate(sta);
158
159 if (changed)
160 ieee80211_mbss_info_change_notify(sdata, changed);
161 }
162
mesh_rmc_init(struct ieee80211_sub_if_data * sdata)163 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
164 {
165 int i;
166
167 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
168 if (!sdata->u.mesh.rmc)
169 return -ENOMEM;
170 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
171 for (i = 0; i < RMC_BUCKETS; i++)
172 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
173 return 0;
174 }
175
mesh_rmc_free(struct ieee80211_sub_if_data * sdata)176 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
177 {
178 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
179 struct rmc_entry *p;
180 struct hlist_node *n;
181 int i;
182
183 if (!sdata->u.mesh.rmc)
184 return;
185
186 for (i = 0; i < RMC_BUCKETS; i++) {
187 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
188 hlist_del(&p->list);
189 kmem_cache_free(rm_cache, p);
190 }
191 }
192
193 kfree(rmc);
194 sdata->u.mesh.rmc = NULL;
195 }
196
197 /**
198 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
199 *
200 * @sdata: interface
201 * @sa: source address
202 * @mesh_hdr: mesh_header
203 *
204 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
205 *
206 * Checks using the source address and the mesh sequence number if we have
207 * received this frame lately. If the frame is not in the cache, it is added to
208 * it.
209 */
mesh_rmc_check(struct ieee80211_sub_if_data * sdata,const u8 * sa,struct ieee80211s_hdr * mesh_hdr)210 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
211 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
212 {
213 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
214 u32 seqnum = 0;
215 int entries = 0;
216 u8 idx;
217 struct rmc_entry *p;
218 struct hlist_node *n;
219
220 if (!rmc)
221 return -1;
222
223 /* Don't care about endianness since only match matters */
224 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
225 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
226 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
227 ++entries;
228 if (time_after(jiffies, p->exp_time) ||
229 entries == RMC_QUEUE_MAX_LEN) {
230 hlist_del(&p->list);
231 kmem_cache_free(rm_cache, p);
232 --entries;
233 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
234 return -1;
235 }
236
237 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
238 if (!p)
239 return 0;
240
241 p->seqnum = seqnum;
242 p->exp_time = jiffies + RMC_TIMEOUT;
243 memcpy(p->sa, sa, ETH_ALEN);
244 hlist_add_head(&p->list, &rmc->bucket[idx]);
245 return 0;
246 }
247
mesh_add_meshconf_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)248 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
249 struct sk_buff *skb)
250 {
251 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
252 u8 *pos, neighbors;
253 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
254 bool is_connected_to_gate = ifmsh->num_gates > 0 ||
255 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
256 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
257
258 if (skb_tailroom(skb) < 2 + meshconf_len)
259 return -ENOMEM;
260
261 pos = skb_put(skb, 2 + meshconf_len);
262 *pos++ = WLAN_EID_MESH_CONFIG;
263 *pos++ = meshconf_len;
264
265 /* save a pointer for quick updates in pre-tbtt */
266 ifmsh->meshconf_offset = pos - skb->data;
267
268 /* Active path selection protocol ID */
269 *pos++ = ifmsh->mesh_pp_id;
270 /* Active path selection metric ID */
271 *pos++ = ifmsh->mesh_pm_id;
272 /* Congestion control mode identifier */
273 *pos++ = ifmsh->mesh_cc_id;
274 /* Synchronization protocol identifier */
275 *pos++ = ifmsh->mesh_sp_id;
276 /* Authentication Protocol identifier */
277 *pos++ = ifmsh->mesh_auth_id;
278 /* Mesh Formation Info - number of neighbors */
279 neighbors = atomic_read(&ifmsh->estab_plinks);
280 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
281 *pos++ = (neighbors << 1) | is_connected_to_gate;
282 /* Mesh capability */
283 *pos = 0x00;
284 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
285 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
286 *pos |= ifmsh->accepting_plinks ?
287 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
288 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
289 *pos |= ifmsh->ps_peers_deep_sleep ?
290 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
291 return 0;
292 }
293
mesh_add_meshid_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)294 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
295 {
296 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
297 u8 *pos;
298
299 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
300 return -ENOMEM;
301
302 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
303 *pos++ = WLAN_EID_MESH_ID;
304 *pos++ = ifmsh->mesh_id_len;
305 if (ifmsh->mesh_id_len)
306 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
307
308 return 0;
309 }
310
mesh_add_awake_window_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)311 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
312 struct sk_buff *skb)
313 {
314 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
315 u8 *pos;
316
317 /* see IEEE802.11-2012 13.14.6 */
318 if (ifmsh->ps_peers_light_sleep == 0 &&
319 ifmsh->ps_peers_deep_sleep == 0 &&
320 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
321 return 0;
322
323 if (skb_tailroom(skb) < 4)
324 return -ENOMEM;
325
326 pos = skb_put(skb, 2 + 2);
327 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
328 *pos++ = 2;
329 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
330
331 return 0;
332 }
333
mesh_add_vendor_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)334 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
335 struct sk_buff *skb)
336 {
337 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
338 u8 offset, len;
339 const u8 *data;
340
341 if (!ifmsh->ie || !ifmsh->ie_len)
342 return 0;
343
344 /* fast-forward to vendor IEs */
345 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
346
347 if (offset < ifmsh->ie_len) {
348 len = ifmsh->ie_len - offset;
349 data = ifmsh->ie + offset;
350 if (skb_tailroom(skb) < len)
351 return -ENOMEM;
352 skb_put_data(skb, data, len);
353 }
354
355 return 0;
356 }
357
mesh_add_rsn_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)358 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
359 {
360 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
361 u8 len = 0;
362 const u8 *data;
363
364 if (!ifmsh->ie || !ifmsh->ie_len)
365 return 0;
366
367 /* find RSN IE */
368 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
369 if (!data)
370 return 0;
371
372 len = data[1] + 2;
373
374 if (skb_tailroom(skb) < len)
375 return -ENOMEM;
376 skb_put_data(skb, data, len);
377
378 return 0;
379 }
380
mesh_add_ds_params_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)381 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
382 struct sk_buff *skb)
383 {
384 struct ieee80211_chanctx_conf *chanctx_conf;
385 struct ieee80211_channel *chan;
386 u8 *pos;
387
388 if (skb_tailroom(skb) < 3)
389 return -ENOMEM;
390
391 rcu_read_lock();
392 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
393 if (WARN_ON(!chanctx_conf)) {
394 rcu_read_unlock();
395 return -EINVAL;
396 }
397 chan = chanctx_conf->def.chan;
398 rcu_read_unlock();
399
400 pos = skb_put(skb, 2 + 1);
401 *pos++ = WLAN_EID_DS_PARAMS;
402 *pos++ = 1;
403 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
404
405 return 0;
406 }
407
mesh_add_ht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)408 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
409 struct sk_buff *skb)
410 {
411 struct ieee80211_supported_band *sband;
412 u8 *pos;
413
414 sband = ieee80211_get_sband(sdata);
415 if (!sband)
416 return -EINVAL;
417
418 if (!sband->ht_cap.ht_supported ||
419 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
420 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
421 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
422 return 0;
423
424 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
425 return -ENOMEM;
426
427 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
428 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
429
430 return 0;
431 }
432
mesh_add_ht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)433 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
434 struct sk_buff *skb)
435 {
436 struct ieee80211_local *local = sdata->local;
437 struct ieee80211_chanctx_conf *chanctx_conf;
438 struct ieee80211_channel *channel;
439 struct ieee80211_supported_band *sband;
440 struct ieee80211_sta_ht_cap *ht_cap;
441 u8 *pos;
442
443 rcu_read_lock();
444 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
445 if (WARN_ON(!chanctx_conf)) {
446 rcu_read_unlock();
447 return -EINVAL;
448 }
449 channel = chanctx_conf->def.chan;
450 rcu_read_unlock();
451
452 sband = local->hw.wiphy->bands[channel->band];
453 ht_cap = &sband->ht_cap;
454
455 if (!ht_cap->ht_supported ||
456 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
457 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
458 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
459 return 0;
460
461 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
462 return -ENOMEM;
463
464 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
465 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
466 sdata->vif.bss_conf.ht_operation_mode,
467 false);
468
469 return 0;
470 }
471
mesh_add_vht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)472 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
473 struct sk_buff *skb)
474 {
475 struct ieee80211_supported_band *sband;
476 u8 *pos;
477
478 sband = ieee80211_get_sband(sdata);
479 if (!sband)
480 return -EINVAL;
481
482 if (!sband->vht_cap.vht_supported ||
483 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
484 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
485 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
486 return 0;
487
488 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
489 return -ENOMEM;
490
491 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
492 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
493
494 return 0;
495 }
496
mesh_add_vht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)497 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
498 struct sk_buff *skb)
499 {
500 struct ieee80211_local *local = sdata->local;
501 struct ieee80211_chanctx_conf *chanctx_conf;
502 struct ieee80211_channel *channel;
503 struct ieee80211_supported_band *sband;
504 struct ieee80211_sta_vht_cap *vht_cap;
505 u8 *pos;
506
507 rcu_read_lock();
508 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
509 if (WARN_ON(!chanctx_conf)) {
510 rcu_read_unlock();
511 return -EINVAL;
512 }
513 channel = chanctx_conf->def.chan;
514 rcu_read_unlock();
515
516 sband = local->hw.wiphy->bands[channel->band];
517 vht_cap = &sband->vht_cap;
518
519 if (!vht_cap->vht_supported ||
520 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
521 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
522 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
523 return 0;
524
525 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
526 return -ENOMEM;
527
528 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
529 ieee80211_ie_build_vht_oper(pos, vht_cap,
530 &sdata->vif.bss_conf.chandef);
531
532 return 0;
533 }
534
mesh_add_he_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u8 ie_len)535 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
536 struct sk_buff *skb, u8 ie_len)
537 {
538 const struct ieee80211_sta_he_cap *he_cap;
539 struct ieee80211_supported_band *sband;
540 u8 *pos;
541
542 sband = ieee80211_get_sband(sdata);
543 if (!sband)
544 return -EINVAL;
545
546 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
547
548 if (!he_cap ||
549 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
550 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
551 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
552 return 0;
553
554 if (skb_tailroom(skb) < ie_len)
555 return -ENOMEM;
556
557 pos = skb_put(skb, ie_len);
558 ieee80211_ie_build_he_cap(pos, he_cap, pos + ie_len);
559
560 return 0;
561 }
562
mesh_add_he_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)563 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
564 struct sk_buff *skb)
565 {
566 const struct ieee80211_sta_he_cap *he_cap;
567 struct ieee80211_supported_band *sband;
568 u8 *pos;
569
570 sband = ieee80211_get_sband(sdata);
571 if (!sband)
572 return -EINVAL;
573
574 he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
575 if (!he_cap ||
576 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
577 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
578 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
579 return 0;
580
581 if (skb_tailroom(skb) < 2 + 1 + sizeof(struct ieee80211_he_operation))
582 return -ENOMEM;
583
584 pos = skb_put(skb, 2 + 1 + sizeof(struct ieee80211_he_operation));
585 ieee80211_ie_build_he_oper(pos);
586
587 return 0;
588 }
589
ieee80211_mesh_path_timer(struct timer_list * t)590 static void ieee80211_mesh_path_timer(struct timer_list *t)
591 {
592 struct ieee80211_sub_if_data *sdata =
593 from_timer(sdata, t, u.mesh.mesh_path_timer);
594
595 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
596 }
597
ieee80211_mesh_path_root_timer(struct timer_list * t)598 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
599 {
600 struct ieee80211_sub_if_data *sdata =
601 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
602 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
603
604 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
605
606 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
607 }
608
ieee80211_mesh_root_setup(struct ieee80211_if_mesh * ifmsh)609 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
610 {
611 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
612 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
613 else {
614 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
615 /* stop running timer */
616 del_timer_sync(&ifmsh->mesh_path_root_timer);
617 }
618 }
619
620 /**
621 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
622 * @hdr: 802.11 frame header
623 * @fc: frame control field
624 * @meshda: destination address in the mesh
625 * @meshsa: source address address in the mesh. Same as TA, as frame is
626 * locally originated.
627 *
628 * Return the length of the 802.11 (does not include a mesh control header)
629 */
ieee80211_fill_mesh_addresses(struct ieee80211_hdr * hdr,__le16 * fc,const u8 * meshda,const u8 * meshsa)630 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
631 const u8 *meshda, const u8 *meshsa)
632 {
633 if (is_multicast_ether_addr(meshda)) {
634 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
635 /* DA TA SA */
636 memcpy(hdr->addr1, meshda, ETH_ALEN);
637 memcpy(hdr->addr2, meshsa, ETH_ALEN);
638 memcpy(hdr->addr3, meshsa, ETH_ALEN);
639 return 24;
640 } else {
641 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
642 /* RA TA DA SA */
643 eth_zero_addr(hdr->addr1); /* RA is resolved later */
644 memcpy(hdr->addr2, meshsa, ETH_ALEN);
645 memcpy(hdr->addr3, meshda, ETH_ALEN);
646 memcpy(hdr->addr4, meshsa, ETH_ALEN);
647 return 30;
648 }
649 }
650
651 /**
652 * ieee80211_new_mesh_header - create a new mesh header
653 * @sdata: mesh interface to be used
654 * @meshhdr: uninitialized mesh header
655 * @addr4or5: 1st address in the ae header, which may correspond to address 4
656 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
657 * be NULL.
658 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
659 * mesh frame
660 *
661 * Return the header length.
662 */
ieee80211_new_mesh_header(struct ieee80211_sub_if_data * sdata,struct ieee80211s_hdr * meshhdr,const char * addr4or5,const char * addr6)663 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
664 struct ieee80211s_hdr *meshhdr,
665 const char *addr4or5, const char *addr6)
666 {
667 if (WARN_ON(!addr4or5 && addr6))
668 return 0;
669
670 memset(meshhdr, 0, sizeof(*meshhdr));
671
672 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
673
674 /* FIXME: racy -- TX on multiple queues can be concurrent */
675 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
676 sdata->u.mesh.mesh_seqnum++;
677
678 if (addr4or5 && !addr6) {
679 meshhdr->flags |= MESH_FLAGS_AE_A4;
680 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
681 return 2 * ETH_ALEN;
682 } else if (addr4or5 && addr6) {
683 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
684 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
685 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
686 return 3 * ETH_ALEN;
687 }
688
689 return ETH_ALEN;
690 }
691
ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data * sdata)692 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
693 {
694 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
695 u32 changed;
696
697 if (ifmsh->mshcfg.plink_timeout > 0)
698 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
699 mesh_path_expire(sdata);
700
701 changed = mesh_accept_plinks_update(sdata);
702 ieee80211_mbss_info_change_notify(sdata, changed);
703
704 mod_timer(&ifmsh->housekeeping_timer,
705 round_jiffies(jiffies +
706 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
707 }
708
ieee80211_mesh_rootpath(struct ieee80211_sub_if_data * sdata)709 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
710 {
711 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
712 u32 interval;
713
714 mesh_path_tx_root_frame(sdata);
715
716 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
717 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
718 else
719 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
720
721 mod_timer(&ifmsh->mesh_path_root_timer,
722 round_jiffies(TU_TO_EXP_TIME(interval)));
723 }
724
725 static int
ieee80211_mesh_build_beacon(struct ieee80211_if_mesh * ifmsh)726 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
727 {
728 struct beacon_data *bcn;
729 int head_len, tail_len;
730 struct sk_buff *skb;
731 struct ieee80211_mgmt *mgmt;
732 struct ieee80211_chanctx_conf *chanctx_conf;
733 struct mesh_csa_settings *csa;
734 enum nl80211_band band;
735 u8 ie_len_he_cap;
736 u8 *pos;
737 struct ieee80211_sub_if_data *sdata;
738 int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
739
740 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
741 rcu_read_lock();
742 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
743 band = chanctx_conf->def.chan->band;
744 rcu_read_unlock();
745
746 ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
747 NL80211_IFTYPE_MESH_POINT);
748 head_len = hdr_len +
749 2 + /* NULL SSID */
750 /* Channel Switch Announcement */
751 2 + sizeof(struct ieee80211_channel_sw_ie) +
752 /* Mesh Channel Switch Parameters */
753 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
754 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
755 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
756 2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
757 2 + 8 + /* supported rates */
758 2 + 3; /* DS params */
759 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
760 2 + sizeof(struct ieee80211_ht_cap) +
761 2 + sizeof(struct ieee80211_ht_operation) +
762 2 + ifmsh->mesh_id_len +
763 2 + sizeof(struct ieee80211_meshconf_ie) +
764 2 + sizeof(__le16) + /* awake window */
765 2 + sizeof(struct ieee80211_vht_cap) +
766 2 + sizeof(struct ieee80211_vht_operation) +
767 ie_len_he_cap +
768 2 + 1 + sizeof(struct ieee80211_he_operation) +
769 ifmsh->ie_len;
770
771 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
772 /* need an skb for IE builders to operate on */
773 skb = dev_alloc_skb(max(head_len, tail_len));
774
775 if (!bcn || !skb)
776 goto out_free;
777
778 /*
779 * pointers go into the block we allocated,
780 * memory is | beacon_data | head | tail |
781 */
782 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
783
784 /* fill in the head */
785 mgmt = skb_put_zero(skb, hdr_len);
786 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
787 IEEE80211_STYPE_BEACON);
788 eth_broadcast_addr(mgmt->da);
789 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
790 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
791 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
792 mgmt->u.beacon.beacon_int =
793 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
794 mgmt->u.beacon.capab_info |= cpu_to_le16(
795 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
796
797 pos = skb_put(skb, 2);
798 *pos++ = WLAN_EID_SSID;
799 *pos++ = 0x0;
800
801 rcu_read_lock();
802 csa = rcu_dereference(ifmsh->csa);
803 if (csa) {
804 enum nl80211_channel_type ct;
805 struct cfg80211_chan_def *chandef;
806 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
807 2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
808
809 pos = skb_put_zero(skb, ie_len);
810 *pos++ = WLAN_EID_CHANNEL_SWITCH;
811 *pos++ = 3;
812 *pos++ = 0x0;
813 *pos++ = ieee80211_frequency_to_channel(
814 csa->settings.chandef.chan->center_freq);
815 bcn->csa_current_counter = csa->settings.count;
816 bcn->csa_counter_offsets[0] = hdr_len + 6;
817 *pos++ = csa->settings.count;
818 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
819 *pos++ = 6;
820 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
821 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
822 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
823 } else {
824 *pos++ = ifmsh->chsw_ttl;
825 }
826 *pos++ |= csa->settings.block_tx ?
827 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
828 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
829 pos += 2;
830 put_unaligned_le16(ifmsh->pre_value, pos);
831 pos += 2;
832
833 switch (csa->settings.chandef.width) {
834 case NL80211_CHAN_WIDTH_40:
835 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
836 pos = skb_put_zero(skb, ie_len);
837
838 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
839 *pos++ = 1; /* len */
840 ct = cfg80211_get_chandef_type(&csa->settings.chandef);
841 if (ct == NL80211_CHAN_HT40PLUS)
842 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
843 else
844 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
845 break;
846 case NL80211_CHAN_WIDTH_80:
847 case NL80211_CHAN_WIDTH_80P80:
848 case NL80211_CHAN_WIDTH_160:
849 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
850 ie_len = 2 + 2 +
851 sizeof(struct ieee80211_wide_bw_chansw_ie);
852 pos = skb_put_zero(skb, ie_len);
853
854 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
855 *pos++ = 5; /* len */
856 /* put sub IE */
857 chandef = &csa->settings.chandef;
858 ieee80211_ie_build_wide_bw_cs(pos, chandef);
859 break;
860 default:
861 break;
862 }
863 }
864 rcu_read_unlock();
865
866 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
867 mesh_add_ds_params_ie(sdata, skb))
868 goto out_free;
869
870 bcn->head_len = skb->len;
871 memcpy(bcn->head, skb->data, bcn->head_len);
872
873 /* now the tail */
874 skb_trim(skb, 0);
875 bcn->tail = bcn->head + bcn->head_len;
876
877 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
878 mesh_add_rsn_ie(sdata, skb) ||
879 mesh_add_ht_cap_ie(sdata, skb) ||
880 mesh_add_ht_oper_ie(sdata, skb) ||
881 mesh_add_meshid_ie(sdata, skb) ||
882 mesh_add_meshconf_ie(sdata, skb) ||
883 mesh_add_awake_window_ie(sdata, skb) ||
884 mesh_add_vht_cap_ie(sdata, skb) ||
885 mesh_add_vht_oper_ie(sdata, skb) ||
886 mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
887 mesh_add_he_oper_ie(sdata, skb) ||
888 mesh_add_vendor_ies(sdata, skb))
889 goto out_free;
890
891 bcn->tail_len = skb->len;
892 memcpy(bcn->tail, skb->data, bcn->tail_len);
893 bcn->meshconf = (struct ieee80211_meshconf_ie *)
894 (bcn->tail + ifmsh->meshconf_offset);
895
896 dev_kfree_skb(skb);
897 rcu_assign_pointer(ifmsh->beacon, bcn);
898 return 0;
899 out_free:
900 kfree(bcn);
901 dev_kfree_skb(skb);
902 return -ENOMEM;
903 }
904
905 static int
ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data * sdata)906 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
907 {
908 struct beacon_data *old_bcn;
909 int ret;
910
911 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
912 lockdep_is_held(&sdata->wdev.mtx));
913 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
914 if (ret)
915 /* just reuse old beacon */
916 return ret;
917
918 if (old_bcn)
919 kfree_rcu(old_bcn, rcu_head);
920 return 0;
921 }
922
ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data * sdata,u32 changed)923 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
924 u32 changed)
925 {
926 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
927 unsigned long bits = changed;
928 u32 bit;
929
930 if (!bits)
931 return;
932
933 /* if we race with running work, worst case this work becomes a noop */
934 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
935 set_bit(bit, &ifmsh->mbss_changed);
936 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
937 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
938 }
939
ieee80211_start_mesh(struct ieee80211_sub_if_data * sdata)940 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
941 {
942 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
943 struct ieee80211_local *local = sdata->local;
944 u32 changed = BSS_CHANGED_BEACON |
945 BSS_CHANGED_BEACON_ENABLED |
946 BSS_CHANGED_HT |
947 BSS_CHANGED_BASIC_RATES |
948 BSS_CHANGED_BEACON_INT |
949 BSS_CHANGED_MCAST_RATE;
950
951 local->fif_other_bss++;
952 /* mesh ifaces must set allmulti to forward mcast traffic */
953 atomic_inc(&local->iff_allmultis);
954 ieee80211_configure_filter(local);
955
956 ifmsh->mesh_cc_id = 0; /* Disabled */
957 /* register sync ops from extensible synchronization framework */
958 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
959 ifmsh->sync_offset_clockdrift_max = 0;
960 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
961 ieee80211_mesh_root_setup(ifmsh);
962 ieee80211_queue_work(&local->hw, &sdata->work);
963 sdata->vif.bss_conf.ht_operation_mode =
964 ifmsh->mshcfg.ht_opmode;
965 sdata->vif.bss_conf.enable_beacon = true;
966
967 changed |= ieee80211_mps_local_status_update(sdata);
968
969 if (ieee80211_mesh_build_beacon(ifmsh)) {
970 ieee80211_stop_mesh(sdata);
971 return -ENOMEM;
972 }
973
974 ieee80211_recalc_dtim(local, sdata);
975 ieee80211_bss_info_change_notify(sdata, changed);
976
977 netif_carrier_on(sdata->dev);
978 return 0;
979 }
980
ieee80211_stop_mesh(struct ieee80211_sub_if_data * sdata)981 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
982 {
983 struct ieee80211_local *local = sdata->local;
984 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
985 struct beacon_data *bcn;
986
987 netif_carrier_off(sdata->dev);
988
989 /* flush STAs and mpaths on this iface */
990 sta_info_flush(sdata);
991 ieee80211_free_keys(sdata, true);
992 mesh_path_flush_by_iface(sdata);
993
994 /* stop the beacon */
995 ifmsh->mesh_id_len = 0;
996 sdata->vif.bss_conf.enable_beacon = false;
997 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
998 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
999
1000 /* remove beacon */
1001 bcn = rcu_dereference_protected(ifmsh->beacon,
1002 lockdep_is_held(&sdata->wdev.mtx));
1003 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1004 kfree_rcu(bcn, rcu_head);
1005
1006 /* free all potentially still buffered group-addressed frames */
1007 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1008 skb_queue_purge(&ifmsh->ps.bc_buf);
1009
1010 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1011 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1012 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1013
1014 /* clear any mesh work (for next join) we may have accrued */
1015 ifmsh->wrkq_flags = 0;
1016 ifmsh->mbss_changed = 0;
1017
1018 local->fif_other_bss--;
1019 atomic_dec(&local->iff_allmultis);
1020 ieee80211_configure_filter(local);
1021 }
1022
ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data * sdata)1023 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1024 {
1025 int err;
1026
1027 /* if the current channel is a DFS channel, mark the channel as
1028 * unavailable.
1029 */
1030 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1031 &sdata->vif.bss_conf.chandef,
1032 NL80211_IFTYPE_MESH_POINT);
1033 if (err > 0)
1034 cfg80211_radar_event(sdata->local->hw.wiphy,
1035 &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1036 }
1037
1038 static bool
ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)1039 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1040 struct ieee802_11_elems *elems, bool beacon)
1041 {
1042 struct cfg80211_csa_settings params;
1043 struct ieee80211_csa_ie csa_ie;
1044 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1045 struct ieee80211_supported_band *sband;
1046 int err;
1047 u32 sta_flags;
1048
1049 sdata_assert_lock(sdata);
1050
1051 sband = ieee80211_get_sband(sdata);
1052 if (!sband)
1053 return false;
1054
1055 sta_flags = 0;
1056 switch (sdata->vif.bss_conf.chandef.width) {
1057 case NL80211_CHAN_WIDTH_20_NOHT:
1058 sta_flags |= IEEE80211_STA_DISABLE_HT;
1059 /* fall through */
1060 case NL80211_CHAN_WIDTH_20:
1061 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
1062 /* fall through */
1063 case NL80211_CHAN_WIDTH_40:
1064 sta_flags |= IEEE80211_STA_DISABLE_VHT;
1065 break;
1066 default:
1067 break;
1068 }
1069
1070 memset(¶ms, 0, sizeof(params));
1071 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1072 sta_flags, sdata->vif.addr,
1073 &csa_ie);
1074 if (err < 0)
1075 return false;
1076 if (err)
1077 return false;
1078
1079 /* Mark the channel unavailable if the reason for the switch is
1080 * regulatory.
1081 */
1082 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1083 ieee80211_mesh_csa_mark_radar(sdata);
1084
1085 params.chandef = csa_ie.chandef;
1086 params.count = csa_ie.count;
1087
1088 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
1089 IEEE80211_CHAN_DISABLED) ||
1090 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef,
1091 NL80211_IFTYPE_MESH_POINT)) {
1092 sdata_info(sdata,
1093 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1094 sdata->vif.addr,
1095 params.chandef.chan->center_freq,
1096 params.chandef.width,
1097 params.chandef.center_freq1,
1098 params.chandef.center_freq2);
1099 return false;
1100 }
1101
1102 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1103 ¶ms.chandef,
1104 NL80211_IFTYPE_MESH_POINT);
1105 if (err < 0)
1106 return false;
1107 if (err > 0 && !ifmsh->userspace_handles_dfs) {
1108 sdata_info(sdata,
1109 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1110 sdata->vif.addr,
1111 params.chandef.chan->center_freq,
1112 params.chandef.width,
1113 params.chandef.center_freq1,
1114 params.chandef.center_freq2);
1115 return false;
1116 }
1117
1118 params.radar_required = err;
1119
1120 if (cfg80211_chandef_identical(¶ms.chandef,
1121 &sdata->vif.bss_conf.chandef)) {
1122 mcsa_dbg(sdata,
1123 "received csa with an identical chandef, ignoring\n");
1124 return true;
1125 }
1126
1127 mcsa_dbg(sdata,
1128 "received channel switch announcement to go to channel %d MHz\n",
1129 params.chandef.chan->center_freq);
1130
1131 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1132 if (beacon) {
1133 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1134 if (ifmsh->pre_value >= csa_ie.pre_value)
1135 return false;
1136 ifmsh->pre_value = csa_ie.pre_value;
1137 }
1138
1139 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1140 return false;
1141
1142 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1143
1144 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1145 ¶ms) < 0)
1146 return false;
1147
1148 return true;
1149 }
1150
1151 static void
ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1152 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1153 struct ieee80211_mgmt *mgmt, size_t len)
1154 {
1155 struct ieee80211_local *local = sdata->local;
1156 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1157 struct sk_buff *presp;
1158 struct beacon_data *bcn;
1159 struct ieee80211_mgmt *hdr;
1160 struct ieee802_11_elems elems;
1161 size_t baselen;
1162 u8 *pos;
1163
1164 pos = mgmt->u.probe_req.variable;
1165 baselen = (u8 *) pos - (u8 *) mgmt;
1166 if (baselen > len)
1167 return;
1168
1169 ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid,
1170 NULL);
1171
1172 if (!elems.mesh_id)
1173 return;
1174
1175 /* 802.11-2012 10.1.4.3.2 */
1176 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1177 !is_broadcast_ether_addr(mgmt->da)) ||
1178 elems.ssid_len != 0)
1179 return;
1180
1181 if (elems.mesh_id_len != 0 &&
1182 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1183 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1184 return;
1185
1186 rcu_read_lock();
1187 bcn = rcu_dereference(ifmsh->beacon);
1188
1189 if (!bcn)
1190 goto out;
1191
1192 presp = dev_alloc_skb(local->tx_headroom +
1193 bcn->head_len + bcn->tail_len);
1194 if (!presp)
1195 goto out;
1196
1197 skb_reserve(presp, local->tx_headroom);
1198 skb_put_data(presp, bcn->head, bcn->head_len);
1199 skb_put_data(presp, bcn->tail, bcn->tail_len);
1200 hdr = (struct ieee80211_mgmt *) presp->data;
1201 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1202 IEEE80211_STYPE_PROBE_RESP);
1203 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1204 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1205 ieee80211_tx_skb(sdata, presp);
1206 out:
1207 rcu_read_unlock();
1208 }
1209
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)1210 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1211 u16 stype,
1212 struct ieee80211_mgmt *mgmt,
1213 size_t len,
1214 struct ieee80211_rx_status *rx_status)
1215 {
1216 struct ieee80211_local *local = sdata->local;
1217 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1218 struct ieee802_11_elems elems;
1219 struct ieee80211_channel *channel;
1220 size_t baselen;
1221 int freq;
1222 enum nl80211_band band = rx_status->band;
1223
1224 /* ignore ProbeResp to foreign address */
1225 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1226 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1227 return;
1228
1229 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1230 if (baselen > len)
1231 return;
1232
1233 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1234 false, &elems, mgmt->bssid, NULL);
1235
1236 /* ignore non-mesh or secure / unsecure mismatch */
1237 if ((!elems.mesh_id || !elems.mesh_config) ||
1238 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1239 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1240 return;
1241
1242 if (elems.ds_params)
1243 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1244 else
1245 freq = rx_status->freq;
1246
1247 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1248
1249 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1250 return;
1251
1252 if (mesh_matches_local(sdata, &elems)) {
1253 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1254 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1255 if (!sdata->u.mesh.user_mpm ||
1256 sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1257 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1258 mesh_neighbour_update(sdata, mgmt->sa, &elems,
1259 rx_status);
1260 }
1261
1262 if (ifmsh->sync_ops)
1263 ifmsh->sync_ops->rx_bcn_presp(sdata,
1264 stype, mgmt, &elems, rx_status);
1265
1266 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1267 !sdata->vif.csa_active)
1268 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1269 }
1270
ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data * sdata)1271 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1272 {
1273 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1274 struct mesh_csa_settings *tmp_csa_settings;
1275 int ret = 0;
1276 int changed = 0;
1277
1278 /* Reset the TTL value and Initiator flag */
1279 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1280 ifmsh->chsw_ttl = 0;
1281
1282 /* Remove the CSA and MCSP elements from the beacon */
1283 tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
1284 lockdep_is_held(&sdata->wdev.mtx));
1285 RCU_INIT_POINTER(ifmsh->csa, NULL);
1286 if (tmp_csa_settings)
1287 kfree_rcu(tmp_csa_settings, rcu_head);
1288 ret = ieee80211_mesh_rebuild_beacon(sdata);
1289 if (ret)
1290 return -EINVAL;
1291
1292 changed |= BSS_CHANGED_BEACON;
1293
1294 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1295 sdata->vif.bss_conf.chandef.chan->center_freq);
1296 return changed;
1297 }
1298
ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)1299 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1300 struct cfg80211_csa_settings *csa_settings)
1301 {
1302 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1303 struct mesh_csa_settings *tmp_csa_settings;
1304 int ret = 0;
1305
1306 lockdep_assert_held(&sdata->wdev.mtx);
1307
1308 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1309 GFP_ATOMIC);
1310 if (!tmp_csa_settings)
1311 return -ENOMEM;
1312
1313 memcpy(&tmp_csa_settings->settings, csa_settings,
1314 sizeof(struct cfg80211_csa_settings));
1315
1316 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1317
1318 ret = ieee80211_mesh_rebuild_beacon(sdata);
1319 if (ret) {
1320 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1321 RCU_INIT_POINTER(ifmsh->csa, NULL);
1322 kfree_rcu(tmp_csa_settings, rcu_head);
1323 return ret;
1324 }
1325
1326 return BSS_CHANGED_BEACON;
1327 }
1328
mesh_fwd_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee802_11_elems * elems)1329 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1330 struct ieee80211_mgmt *mgmt, size_t len,
1331 struct ieee802_11_elems *elems)
1332 {
1333 struct ieee80211_mgmt *mgmt_fwd;
1334 struct sk_buff *skb;
1335 struct ieee80211_local *local = sdata->local;
1336
1337 skb = dev_alloc_skb(local->tx_headroom + len);
1338 if (!skb)
1339 return -ENOMEM;
1340 skb_reserve(skb, local->tx_headroom);
1341 mgmt_fwd = skb_put(skb, len);
1342
1343 elems->mesh_chansw_params_ie->mesh_ttl--;
1344 elems->mesh_chansw_params_ie->mesh_flags &=
1345 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1346
1347 memcpy(mgmt_fwd, mgmt, len);
1348 eth_broadcast_addr(mgmt_fwd->da);
1349 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1350 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1351
1352 ieee80211_tx_skb(sdata, skb);
1353 return 0;
1354 }
1355
mesh_rx_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1356 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1357 struct ieee80211_mgmt *mgmt, size_t len)
1358 {
1359 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1360 struct ieee802_11_elems elems;
1361 u16 pre_value;
1362 bool fwd_csa = true;
1363 size_t baselen;
1364 u8 *pos;
1365
1366 if (mgmt->u.action.u.measurement.action_code !=
1367 WLAN_ACTION_SPCT_CHL_SWITCH)
1368 return;
1369
1370 pos = mgmt->u.action.u.chan_switch.variable;
1371 baselen = offsetof(struct ieee80211_mgmt,
1372 u.action.u.chan_switch.variable);
1373 ieee802_11_parse_elems(pos, len - baselen, true, &elems,
1374 mgmt->bssid, NULL);
1375
1376 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1377 if (!--ifmsh->chsw_ttl)
1378 fwd_csa = false;
1379
1380 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1381 if (ifmsh->pre_value >= pre_value)
1382 return;
1383
1384 ifmsh->pre_value = pre_value;
1385
1386 if (!sdata->vif.csa_active &&
1387 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1388 mcsa_dbg(sdata, "Failed to process CSA action frame");
1389 return;
1390 }
1391
1392 /* forward or re-broadcast the CSA frame */
1393 if (fwd_csa) {
1394 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0)
1395 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1396 }
1397 }
1398
ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1399 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1400 struct ieee80211_mgmt *mgmt,
1401 size_t len,
1402 struct ieee80211_rx_status *rx_status)
1403 {
1404 switch (mgmt->u.action.category) {
1405 case WLAN_CATEGORY_SELF_PROTECTED:
1406 switch (mgmt->u.action.u.self_prot.action_code) {
1407 case WLAN_SP_MESH_PEERING_OPEN:
1408 case WLAN_SP_MESH_PEERING_CLOSE:
1409 case WLAN_SP_MESH_PEERING_CONFIRM:
1410 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1411 break;
1412 }
1413 break;
1414 case WLAN_CATEGORY_MESH_ACTION:
1415 if (mesh_action_is_path_sel(mgmt))
1416 mesh_rx_path_sel_frame(sdata, mgmt, len);
1417 break;
1418 case WLAN_CATEGORY_SPECTRUM_MGMT:
1419 mesh_rx_csa_frame(sdata, mgmt, len);
1420 break;
1421 }
1422 }
1423
ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1424 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1425 struct sk_buff *skb)
1426 {
1427 struct ieee80211_rx_status *rx_status;
1428 struct ieee80211_mgmt *mgmt;
1429 u16 stype;
1430
1431 sdata_lock(sdata);
1432
1433 /* mesh already went down */
1434 if (!sdata->u.mesh.mesh_id_len)
1435 goto out;
1436
1437 rx_status = IEEE80211_SKB_RXCB(skb);
1438 mgmt = (struct ieee80211_mgmt *) skb->data;
1439 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1440
1441 switch (stype) {
1442 case IEEE80211_STYPE_PROBE_RESP:
1443 case IEEE80211_STYPE_BEACON:
1444 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1445 rx_status);
1446 break;
1447 case IEEE80211_STYPE_PROBE_REQ:
1448 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1449 break;
1450 case IEEE80211_STYPE_ACTION:
1451 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1452 break;
1453 }
1454 out:
1455 sdata_unlock(sdata);
1456 }
1457
mesh_bss_info_changed(struct ieee80211_sub_if_data * sdata)1458 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1459 {
1460 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1461 u32 bit, changed = 0;
1462
1463 for_each_set_bit(bit, &ifmsh->mbss_changed,
1464 sizeof(changed) * BITS_PER_BYTE) {
1465 clear_bit(bit, &ifmsh->mbss_changed);
1466 changed |= BIT(bit);
1467 }
1468
1469 if (sdata->vif.bss_conf.enable_beacon &&
1470 (changed & (BSS_CHANGED_BEACON |
1471 BSS_CHANGED_HT |
1472 BSS_CHANGED_BASIC_RATES |
1473 BSS_CHANGED_BEACON_INT)))
1474 if (ieee80211_mesh_rebuild_beacon(sdata))
1475 return;
1476
1477 ieee80211_bss_info_change_notify(sdata, changed);
1478 }
1479
ieee80211_mesh_work(struct ieee80211_sub_if_data * sdata)1480 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1481 {
1482 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1483
1484 sdata_lock(sdata);
1485
1486 /* mesh already went down */
1487 if (!sdata->u.mesh.mesh_id_len)
1488 goto out;
1489
1490 if (ifmsh->preq_queue_len &&
1491 time_after(jiffies,
1492 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1493 mesh_path_start_discovery(sdata);
1494
1495 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1496 ieee80211_mesh_housekeeping(sdata);
1497
1498 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1499 ieee80211_mesh_rootpath(sdata);
1500
1501 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1502 mesh_sync_adjust_tsf(sdata);
1503
1504 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1505 mesh_bss_info_changed(sdata);
1506 out:
1507 sdata_unlock(sdata);
1508 }
1509
1510
ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data * sdata)1511 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1512 {
1513 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1514 static u8 zero_addr[ETH_ALEN] = {};
1515
1516 timer_setup(&ifmsh->housekeeping_timer,
1517 ieee80211_mesh_housekeeping_timer, 0);
1518
1519 ifmsh->accepting_plinks = true;
1520 atomic_set(&ifmsh->mpaths, 0);
1521 mesh_rmc_init(sdata);
1522 ifmsh->last_preq = jiffies;
1523 ifmsh->next_perr = jiffies;
1524 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1525 /* Allocate all mesh structures when creating the first mesh interface. */
1526 if (!mesh_allocated)
1527 ieee80211s_init();
1528
1529 mesh_pathtbl_init(sdata);
1530
1531 timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1532 timer_setup(&ifmsh->mesh_path_root_timer,
1533 ieee80211_mesh_path_root_timer, 0);
1534 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1535 skb_queue_head_init(&ifmsh->ps.bc_buf);
1536 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1537 spin_lock_init(&ifmsh->sync_offset_lock);
1538 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1539
1540 sdata->vif.bss_conf.bssid = zero_addr;
1541 }
1542
ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data * sdata)1543 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1544 {
1545 mesh_rmc_free(sdata);
1546 mesh_pathtbl_unregister(sdata);
1547 }
1548