xref: /linux/net/mac80211/mesh.c (revision 150b567e0d572342ef08bace7ee7aff80fd75327)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2008, 2009 open80211s Ltd.
4  * Copyright (C) 2018 - 2024 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 <linux/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  *
60  * Returns: %true if both nodes belong to the same mesh
61  */
mesh_matches_local(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * ie)62 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
63 			struct ieee802_11_elems *ie)
64 {
65 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
66 	u32 basic_rates = 0;
67 	struct cfg80211_chan_def sta_chan_def;
68 	struct ieee80211_supported_band *sband;
69 	u32 vht_cap_info = 0;
70 
71 	/*
72 	 * As support for each feature is added, check for matching
73 	 * - On mesh config capabilities
74 	 *   - Power Save Support En
75 	 *   - Sync support enabled
76 	 *   - Sync support active
77 	 *   - Sync support required from peer
78 	 *   - MDA enabled
79 	 * - Power management control on fc
80 	 */
81 	if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
82 	     memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
83 	     (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
84 	     (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
85 	     (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
86 	     (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
87 	     (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
88 		return false;
89 
90 	sband = ieee80211_get_sband(sdata);
91 	if (!sband)
92 		return false;
93 
94 	ieee80211_sta_get_rates(sdata, ie, sband->band,
95 				&basic_rates);
96 
97 	if (sdata->vif.bss_conf.basic_rates != basic_rates)
98 		return false;
99 
100 	cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chanreq.oper.chan,
101 				NL80211_CHAN_NO_HT);
102 	ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
103 
104 	if (ie->vht_cap_elem)
105 		vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info);
106 
107 	ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
108 				   ie->vht_operation, ie->ht_operation,
109 				   &sta_chan_def);
110 	ieee80211_chandef_he_6ghz_oper(sdata->local, ie->he_operation,
111 				       ie->eht_operation,
112 				       &sta_chan_def);
113 
114 	if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chanreq.oper,
115 					 &sta_chan_def))
116 		return false;
117 
118 	return true;
119 }
120 
121 /**
122  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
123  *
124  * @ie: information elements of a management frame from the mesh peer
125  *
126  * Returns: %true if the mesh peer is willing to establish peer links
127  */
mesh_peer_accepts_plinks(struct ieee802_11_elems * ie)128 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
129 {
130 	return (ie->mesh_config->meshconf_cap &
131 			IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
132 }
133 
134 /**
135  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
136  *
137  * @sdata: mesh interface in which mesh beacons are going to be updated
138  *
139  * Returns: beacon changed flag if the beacon content changed.
140  */
mesh_accept_plinks_update(struct ieee80211_sub_if_data * sdata)141 u64 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
142 {
143 	bool free_plinks;
144 	u64 changed = 0;
145 
146 	/* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
147 	 * the mesh interface might be able to establish plinks with peers that
148 	 * are already on the table but are not on PLINK_ESTAB state. However,
149 	 * in general the mesh interface is not accepting peer link requests
150 	 * from new peers, and that must be reflected in the beacon
151 	 */
152 	free_plinks = mesh_plink_availables(sdata);
153 
154 	if (free_plinks != sdata->u.mesh.accepting_plinks) {
155 		sdata->u.mesh.accepting_plinks = free_plinks;
156 		changed = BSS_CHANGED_BEACON;
157 	}
158 
159 	return changed;
160 }
161 
162 /*
163  * mesh_sta_cleanup - clean up any mesh sta state
164  *
165  * @sta: mesh sta to clean up.
166  */
mesh_sta_cleanup(struct sta_info * sta)167 void mesh_sta_cleanup(struct sta_info *sta)
168 {
169 	struct ieee80211_sub_if_data *sdata = sta->sdata;
170 	u64 changed = mesh_plink_deactivate(sta);
171 
172 	if (changed)
173 		ieee80211_mbss_info_change_notify(sdata, changed);
174 }
175 
mesh_rmc_init(struct ieee80211_sub_if_data * sdata)176 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
177 {
178 	int i;
179 
180 	sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
181 	if (!sdata->u.mesh.rmc)
182 		return -ENOMEM;
183 	sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
184 	for (i = 0; i < RMC_BUCKETS; i++)
185 		INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
186 	return 0;
187 }
188 
mesh_rmc_free(struct ieee80211_sub_if_data * sdata)189 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
190 {
191 	struct mesh_rmc *rmc = sdata->u.mesh.rmc;
192 	struct rmc_entry *p;
193 	struct hlist_node *n;
194 	int i;
195 
196 	if (!sdata->u.mesh.rmc)
197 		return;
198 
199 	for (i = 0; i < RMC_BUCKETS; i++) {
200 		hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
201 			hlist_del(&p->list);
202 			kmem_cache_free(rm_cache, p);
203 		}
204 	}
205 
206 	kfree(rmc);
207 	sdata->u.mesh.rmc = NULL;
208 }
209 
210 /**
211  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
212  *
213  * @sdata:	interface
214  * @sa:		source address
215  * @mesh_hdr:	mesh_header
216  *
217  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
218  *
219  * Checks using the source address and the mesh sequence number if we have
220  * received this frame lately. If the frame is not in the cache, it is added to
221  * it.
222  */
mesh_rmc_check(struct ieee80211_sub_if_data * sdata,const u8 * sa,struct ieee80211s_hdr * mesh_hdr)223 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
224 		   const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
225 {
226 	struct mesh_rmc *rmc = sdata->u.mesh.rmc;
227 	u32 seqnum = 0;
228 	int entries = 0;
229 	u8 idx;
230 	struct rmc_entry *p;
231 	struct hlist_node *n;
232 
233 	if (!rmc)
234 		return -1;
235 
236 	/* Don't care about endianness since only match matters */
237 	memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
238 	idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
239 	hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
240 		++entries;
241 		if (time_after(jiffies, p->exp_time) ||
242 		    entries == RMC_QUEUE_MAX_LEN) {
243 			hlist_del(&p->list);
244 			kmem_cache_free(rm_cache, p);
245 			--entries;
246 		} else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
247 			return -1;
248 	}
249 
250 	p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
251 	if (!p)
252 		return 0;
253 
254 	p->seqnum = seqnum;
255 	p->exp_time = jiffies + RMC_TIMEOUT;
256 	memcpy(p->sa, sa, ETH_ALEN);
257 	hlist_add_head(&p->list, &rmc->bucket[idx]);
258 	return 0;
259 }
260 
mesh_add_meshconf_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)261 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
262 			 struct sk_buff *skb)
263 {
264 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
265 	u8 *pos, neighbors;
266 	u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
267 	bool is_connected_to_gate = ifmsh->num_gates > 0 ||
268 		ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
269 		ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
270 	bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
271 
272 	if (skb_tailroom(skb) < 2 + meshconf_len)
273 		return -ENOMEM;
274 
275 	pos = skb_put(skb, 2 + meshconf_len);
276 	*pos++ = WLAN_EID_MESH_CONFIG;
277 	*pos++ = meshconf_len;
278 
279 	/* save a pointer for quick updates in pre-tbtt */
280 	ifmsh->meshconf_offset = pos - skb->data;
281 
282 	/* Active path selection protocol ID */
283 	*pos++ = ifmsh->mesh_pp_id;
284 	/* Active path selection metric ID   */
285 	*pos++ = ifmsh->mesh_pm_id;
286 	/* Congestion control mode identifier */
287 	*pos++ = ifmsh->mesh_cc_id;
288 	/* Synchronization protocol identifier */
289 	*pos++ = ifmsh->mesh_sp_id;
290 	/* Authentication Protocol identifier */
291 	*pos++ = ifmsh->mesh_auth_id;
292 	/* Mesh Formation Info - number of neighbors */
293 	neighbors = atomic_read(&ifmsh->estab_plinks);
294 	neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
295 	*pos++ = (is_connected_to_as << 7) |
296 		 (neighbors << 1) |
297 		 is_connected_to_gate;
298 	/* Mesh capability */
299 	*pos = 0x00;
300 	*pos |= ifmsh->mshcfg.dot11MeshForwarding ?
301 			IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
302 	*pos |= ifmsh->accepting_plinks ?
303 			IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
304 	/* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
305 	*pos |= ifmsh->ps_peers_deep_sleep ?
306 			IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
307 	return 0;
308 }
309 
mesh_add_meshid_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)310 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
311 {
312 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
313 	u8 *pos;
314 
315 	if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
316 		return -ENOMEM;
317 
318 	pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
319 	*pos++ = WLAN_EID_MESH_ID;
320 	*pos++ = ifmsh->mesh_id_len;
321 	if (ifmsh->mesh_id_len)
322 		memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
323 
324 	return 0;
325 }
326 
mesh_add_awake_window_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)327 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
328 				    struct sk_buff *skb)
329 {
330 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
331 	u8 *pos;
332 
333 	/* see IEEE802.11-2012 13.14.6 */
334 	if (ifmsh->ps_peers_light_sleep == 0 &&
335 	    ifmsh->ps_peers_deep_sleep == 0 &&
336 	    ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
337 		return 0;
338 
339 	if (skb_tailroom(skb) < 4)
340 		return -ENOMEM;
341 
342 	pos = skb_put(skb, 2 + 2);
343 	*pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
344 	*pos++ = 2;
345 	put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
346 
347 	return 0;
348 }
349 
mesh_add_vendor_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)350 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
351 			struct sk_buff *skb)
352 {
353 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
354 	u8 offset, len;
355 	const u8 *data;
356 
357 	if (!ifmsh->ie || !ifmsh->ie_len)
358 		return 0;
359 
360 	/* fast-forward to vendor IEs */
361 	offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
362 
363 	if (offset < ifmsh->ie_len) {
364 		len = ifmsh->ie_len - offset;
365 		data = ifmsh->ie + offset;
366 		if (skb_tailroom(skb) < len)
367 			return -ENOMEM;
368 		skb_put_data(skb, data, len);
369 	}
370 
371 	return 0;
372 }
373 
mesh_add_rsn_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)374 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
375 {
376 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
377 	u8 len = 0;
378 	const u8 *data;
379 
380 	if (!ifmsh->ie || !ifmsh->ie_len)
381 		return 0;
382 
383 	/* find RSN IE */
384 	data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
385 	if (!data)
386 		return 0;
387 
388 	len = data[1] + 2;
389 
390 	if (skb_tailroom(skb) < len)
391 		return -ENOMEM;
392 	skb_put_data(skb, data, len);
393 
394 	return 0;
395 }
396 
mesh_add_ds_params_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)397 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
398 				 struct sk_buff *skb)
399 {
400 	struct ieee80211_chanctx_conf *chanctx_conf;
401 	struct ieee80211_channel *chan;
402 	u8 *pos;
403 
404 	if (skb_tailroom(skb) < 3)
405 		return -ENOMEM;
406 
407 	rcu_read_lock();
408 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
409 	if (WARN_ON(!chanctx_conf)) {
410 		rcu_read_unlock();
411 		return -EINVAL;
412 	}
413 	chan = chanctx_conf->def.chan;
414 	rcu_read_unlock();
415 
416 	pos = skb_put(skb, 2 + 1);
417 	*pos++ = WLAN_EID_DS_PARAMS;
418 	*pos++ = 1;
419 	*pos++ = ieee80211_frequency_to_channel(chan->center_freq);
420 
421 	return 0;
422 }
423 
mesh_add_ht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)424 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
425 		       struct sk_buff *skb)
426 {
427 	struct ieee80211_supported_band *sband;
428 	u8 *pos;
429 
430 	sband = ieee80211_get_sband(sdata);
431 	if (!sband)
432 		return -EINVAL;
433 
434 	/* HT not allowed in 6 GHz */
435 	if (sband->band == NL80211_BAND_6GHZ)
436 		return 0;
437 
438 	if (!sband->ht_cap.ht_supported ||
439 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
440 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
441 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
442 		return 0;
443 
444 	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
445 		return -ENOMEM;
446 
447 	pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
448 	ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
449 
450 	return 0;
451 }
452 
mesh_add_ht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)453 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
454 			struct sk_buff *skb)
455 {
456 	struct ieee80211_local *local = sdata->local;
457 	struct ieee80211_chanctx_conf *chanctx_conf;
458 	struct ieee80211_channel *channel;
459 	struct ieee80211_supported_band *sband;
460 	struct ieee80211_sta_ht_cap *ht_cap;
461 	u8 *pos;
462 
463 	rcu_read_lock();
464 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
465 	if (WARN_ON(!chanctx_conf)) {
466 		rcu_read_unlock();
467 		return -EINVAL;
468 	}
469 	channel = chanctx_conf->def.chan;
470 	rcu_read_unlock();
471 
472 	sband = local->hw.wiphy->bands[channel->band];
473 	ht_cap = &sband->ht_cap;
474 
475 	/* HT not allowed in 6 GHz */
476 	if (sband->band == NL80211_BAND_6GHZ)
477 		return 0;
478 
479 	if (!ht_cap->ht_supported ||
480 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
481 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
482 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
483 		return 0;
484 
485 	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
486 		return -ENOMEM;
487 
488 	pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
489 	ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chanreq.oper,
490 				   sdata->vif.bss_conf.ht_operation_mode,
491 				   false);
492 
493 	return 0;
494 }
495 
mesh_add_vht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)496 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
497 			struct sk_buff *skb)
498 {
499 	struct ieee80211_supported_band *sband;
500 	u8 *pos;
501 
502 	sband = ieee80211_get_sband(sdata);
503 	if (!sband)
504 		return -EINVAL;
505 
506 	/* VHT not allowed in 6 GHz */
507 	if (sband->band == NL80211_BAND_6GHZ)
508 		return 0;
509 
510 	if (!sband->vht_cap.vht_supported ||
511 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
512 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
513 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
514 		return 0;
515 
516 	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
517 		return -ENOMEM;
518 
519 	pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
520 	ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
521 
522 	return 0;
523 }
524 
mesh_add_vht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)525 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
526 			 struct sk_buff *skb)
527 {
528 	struct ieee80211_local *local = sdata->local;
529 	struct ieee80211_chanctx_conf *chanctx_conf;
530 	struct ieee80211_channel *channel;
531 	struct ieee80211_supported_band *sband;
532 	struct ieee80211_sta_vht_cap *vht_cap;
533 	u8 *pos;
534 
535 	rcu_read_lock();
536 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
537 	if (WARN_ON(!chanctx_conf)) {
538 		rcu_read_unlock();
539 		return -EINVAL;
540 	}
541 	channel = chanctx_conf->def.chan;
542 	rcu_read_unlock();
543 
544 	sband = local->hw.wiphy->bands[channel->band];
545 	vht_cap = &sband->vht_cap;
546 
547 	/* VHT not allowed in 6 GHz */
548 	if (sband->band == NL80211_BAND_6GHZ)
549 		return 0;
550 
551 	if (!vht_cap->vht_supported ||
552 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
553 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
554 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
555 		return 0;
556 
557 	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
558 		return -ENOMEM;
559 
560 	pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
561 	ieee80211_ie_build_vht_oper(pos, vht_cap,
562 				    &sdata->vif.bss_conf.chanreq.oper);
563 
564 	return 0;
565 }
566 
mesh_add_he_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u8 ie_len)567 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
568 		       struct sk_buff *skb, u8 ie_len)
569 {
570 	struct ieee80211_supported_band *sband;
571 
572 	sband = ieee80211_get_sband(sdata);
573 	if (!sband)
574 		return -EINVAL;
575 
576 	if (sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
577 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
578 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
579 		return 0;
580 
581 	return ieee80211_put_he_cap(skb, sdata, sband, NULL);
582 }
583 
mesh_add_he_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)584 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
585 			struct sk_buff *skb)
586 {
587 	const struct ieee80211_sta_he_cap *he_cap;
588 	struct ieee80211_supported_band *sband;
589 	u32 len;
590 	u8 *pos;
591 
592 	sband = ieee80211_get_sband(sdata);
593 	if (!sband)
594 		return -EINVAL;
595 
596 	he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
597 	if (!he_cap ||
598 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
599 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
600 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
601 		return 0;
602 
603 	len = 2 + 1 + sizeof(struct ieee80211_he_operation);
604 	if (sdata->vif.bss_conf.chanreq.oper.chan->band == NL80211_BAND_6GHZ)
605 		len += sizeof(struct ieee80211_he_6ghz_oper);
606 
607 	if (skb_tailroom(skb) < len)
608 		return -ENOMEM;
609 
610 	pos = skb_put(skb, len);
611 	ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chanreq.oper);
612 
613 	return 0;
614 }
615 
mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)616 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
617 			    struct sk_buff *skb)
618 {
619 	struct ieee80211_supported_band *sband;
620 	const struct ieee80211_sband_iftype_data *iftd;
621 
622 	sband = ieee80211_get_sband(sdata);
623 	if (!sband)
624 		return -EINVAL;
625 
626 	iftd = ieee80211_get_sband_iftype_data(sband,
627 					       NL80211_IFTYPE_MESH_POINT);
628 	/* The device doesn't support HE in mesh mode or at all */
629 	if (!iftd)
630 		return 0;
631 
632 	ieee80211_put_he_6ghz_cap(skb, sdata, sdata->deflink.smps_mode);
633 	return 0;
634 }
635 
mesh_add_eht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u8 ie_len)636 int mesh_add_eht_cap_ie(struct ieee80211_sub_if_data *sdata,
637 			struct sk_buff *skb, u8 ie_len)
638 {
639 	struct ieee80211_supported_band *sband;
640 
641 	sband = ieee80211_get_sband(sdata);
642 	if (!sband)
643 		return -EINVAL;
644 
645 	if (sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
646 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
647 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
648 		return 0;
649 
650 	return ieee80211_put_eht_cap(skb, sdata, sband, NULL);
651 }
652 
mesh_add_eht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)653 int mesh_add_eht_oper_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
654 {
655 	const struct ieee80211_sta_eht_cap *eht_cap;
656 	struct ieee80211_supported_band *sband;
657 	u32 len;
658 	u8 *pos;
659 
660 	sband = ieee80211_get_sband(sdata);
661 	if (!sband)
662 		return -EINVAL;
663 
664 	eht_cap = ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
665 	if (!eht_cap ||
666 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
667 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
668 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
669 		return 0;
670 
671 	len = 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
672 		      offsetof(struct ieee80211_eht_operation_info, optional);
673 
674 	if (skb_tailroom(skb) < len)
675 		return -ENOMEM;
676 
677 	pos = skb_put(skb, len);
678 	ieee80211_ie_build_eht_oper(pos, &sdata->vif.bss_conf.chanreq.oper, eht_cap);
679 
680 	return 0;
681 }
682 
ieee80211_mesh_path_timer(struct timer_list * t)683 static void ieee80211_mesh_path_timer(struct timer_list *t)
684 {
685 	struct ieee80211_sub_if_data *sdata =
686 		from_timer(sdata, t, u.mesh.mesh_path_timer);
687 
688 	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
689 }
690 
ieee80211_mesh_path_root_timer(struct timer_list * t)691 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
692 {
693 	struct ieee80211_sub_if_data *sdata =
694 		from_timer(sdata, t, u.mesh.mesh_path_root_timer);
695 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
696 
697 	set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
698 
699 	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
700 }
701 
ieee80211_mesh_root_setup(struct ieee80211_if_mesh * ifmsh)702 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
703 {
704 	if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
705 		set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
706 	else {
707 		clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
708 		/* stop running timer */
709 		del_timer_sync(&ifmsh->mesh_path_root_timer);
710 	}
711 }
712 
713 static void
ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data * sdata,u8 * ie,u8 ie_len)714 ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
715 				 u8 *ie, u8 ie_len)
716 {
717 	struct ieee80211_supported_band *sband;
718 	const struct element *cap;
719 	const struct ieee80211_he_operation *he_oper = NULL;
720 
721 	sband = ieee80211_get_sband(sdata);
722 	if (!sband)
723 		return;
724 
725 	if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) ||
726 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
727 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
728 	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
729 		return;
730 
731 	sdata->vif.bss_conf.he_support = true;
732 
733 	cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
734 	if (cap && cap->datalen >= 1 + sizeof(*he_oper) &&
735 	    cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1))
736 		he_oper = (void *)(cap->data + 1);
737 
738 	if (he_oper)
739 		sdata->vif.bss_conf.he_oper.params =
740 			__le32_to_cpu(he_oper->he_oper_params);
741 
742 	sdata->vif.bss_conf.eht_support =
743 		!!ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
744 }
745 
ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 ctrl_flags)746 bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
747 			      struct sk_buff *skb, u32 ctrl_flags)
748 {
749 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
750 	struct ieee80211_mesh_fast_tx_key key = {
751 		.type = MESH_FAST_TX_TYPE_LOCAL
752 	};
753 	struct ieee80211_mesh_fast_tx *entry;
754 	struct ieee80211s_hdr *meshhdr;
755 	u8 sa[ETH_ALEN] __aligned(2);
756 	struct tid_ampdu_tx *tid_tx;
757 	struct sta_info *sta;
758 	bool copy_sa = false;
759 	u16 ethertype;
760 	u8 tid;
761 
762 	if (ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP)
763 		return false;
764 
765 	if (ifmsh->mshcfg.dot11MeshNolearn)
766 		return false;
767 
768 	/* Add support for these cases later */
769 	if (ifmsh->ps_peers_light_sleep || ifmsh->ps_peers_deep_sleep)
770 		return false;
771 
772 	if (is_multicast_ether_addr(skb->data))
773 		return false;
774 
775 	ethertype = (skb->data[12] << 8) | skb->data[13];
776 	if (ethertype < ETH_P_802_3_MIN)
777 		return false;
778 
779 	if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
780 		return false;
781 
782 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
783 		skb_set_transport_header(skb, skb_checksum_start_offset(skb));
784 		if (skb_checksum_help(skb))
785 			return false;
786 	}
787 
788 	ether_addr_copy(key.addr, skb->data);
789 	if (!ether_addr_equal(skb->data + ETH_ALEN, sdata->vif.addr))
790 		key.type = MESH_FAST_TX_TYPE_PROXIED;
791 	entry = mesh_fast_tx_get(sdata, &key);
792 	if (!entry)
793 		return false;
794 
795 	if (skb_headroom(skb) < entry->hdrlen + entry->fast_tx.hdr_len)
796 		return false;
797 
798 	sta = rcu_dereference(entry->mpath->next_hop);
799 	if (!sta)
800 		return false;
801 
802 	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
803 	tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
804 	if (tid_tx) {
805 		if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
806 			return false;
807 		if (tid_tx->timeout)
808 			tid_tx->last_tx = jiffies;
809 	}
810 
811 	skb = skb_share_check(skb, GFP_ATOMIC);
812 	if (!skb)
813 		return true;
814 
815 	skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb));
816 
817 	meshhdr = (struct ieee80211s_hdr *)entry->hdr;
818 	if ((meshhdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) {
819 		/* preserve SA from eth header for 6-addr frames */
820 		ether_addr_copy(sa, skb->data + ETH_ALEN);
821 		copy_sa = true;
822 	}
823 
824 	memcpy(skb_push(skb, entry->hdrlen - 2 * ETH_ALEN), entry->hdr,
825 	       entry->hdrlen);
826 
827 	meshhdr = (struct ieee80211s_hdr *)skb->data;
828 	put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
829 			   &meshhdr->seqnum);
830 	meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
831 	if (copy_sa)
832 	    ether_addr_copy(meshhdr->eaddr2, sa);
833 
834 	skb_push(skb, 2 * ETH_ALEN);
835 	__ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
836 			      entry->mpath->dst, sdata->vif.addr);
837 
838 	return true;
839 }
840 
841 /**
842  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
843  * @hdr:	802.11 frame header
844  * @fc:		frame control field
845  * @meshda:	destination address in the mesh
846  * @meshsa:	source address in the mesh.  Same as TA, as frame is
847  *              locally originated.
848  *
849  * Returns: the length of the 802.11 frame header (excludes mesh control header)
850  */
ieee80211_fill_mesh_addresses(struct ieee80211_hdr * hdr,__le16 * fc,const u8 * meshda,const u8 * meshsa)851 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
852 				  const u8 *meshda, const u8 *meshsa)
853 {
854 	if (is_multicast_ether_addr(meshda)) {
855 		*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
856 		/* DA TA SA */
857 		memcpy(hdr->addr1, meshda, ETH_ALEN);
858 		memcpy(hdr->addr2, meshsa, ETH_ALEN);
859 		memcpy(hdr->addr3, meshsa, ETH_ALEN);
860 		return 24;
861 	} else {
862 		*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
863 		/* RA TA DA SA */
864 		eth_zero_addr(hdr->addr1);   /* RA is resolved later */
865 		memcpy(hdr->addr2, meshsa, ETH_ALEN);
866 		memcpy(hdr->addr3, meshda, ETH_ALEN);
867 		memcpy(hdr->addr4, meshsa, ETH_ALEN);
868 		return 30;
869 	}
870 }
871 
872 /**
873  * ieee80211_new_mesh_header - create a new mesh header
874  * @sdata:	mesh interface to be used
875  * @meshhdr:    uninitialized mesh header
876  * @addr4or5:   1st address in the ae header, which may correspond to address 4
877  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
878  *              be NULL.
879  * @addr6:	2nd address in the ae header, which corresponds to addr6 of the
880  *              mesh frame
881  *
882  * Returns: the header length
883  */
ieee80211_new_mesh_header(struct ieee80211_sub_if_data * sdata,struct ieee80211s_hdr * meshhdr,const char * addr4or5,const char * addr6)884 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
885 				       struct ieee80211s_hdr *meshhdr,
886 				       const char *addr4or5, const char *addr6)
887 {
888 	if (WARN_ON(!addr4or5 && addr6))
889 		return 0;
890 
891 	memset(meshhdr, 0, sizeof(*meshhdr));
892 
893 	meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
894 
895 	put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
896 			   &meshhdr->seqnum);
897 	if (addr4or5 && !addr6) {
898 		meshhdr->flags |= MESH_FLAGS_AE_A4;
899 		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
900 		return 2 * ETH_ALEN;
901 	} else if (addr4or5 && addr6) {
902 		meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
903 		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
904 		memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
905 		return 3 * ETH_ALEN;
906 	}
907 
908 	return ETH_ALEN;
909 }
910 
ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data * sdata)911 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
912 {
913 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
914 	u64 changed;
915 
916 	if (ifmsh->mshcfg.plink_timeout > 0)
917 		ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
918 	mesh_path_expire(sdata);
919 
920 	changed = mesh_accept_plinks_update(sdata);
921 	ieee80211_mbss_info_change_notify(sdata, changed);
922 
923 	mesh_fast_tx_gc(sdata);
924 
925 	mod_timer(&ifmsh->housekeeping_timer,
926 		  round_jiffies(jiffies +
927 				IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
928 }
929 
ieee80211_mesh_rootpath(struct ieee80211_sub_if_data * sdata)930 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
931 {
932 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
933 	u32 interval;
934 
935 	mesh_path_tx_root_frame(sdata);
936 
937 	if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
938 		interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
939 	else
940 		interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
941 
942 	mod_timer(&ifmsh->mesh_path_root_timer,
943 		  round_jiffies(TU_TO_EXP_TIME(interval)));
944 }
945 
946 static int
ieee80211_mesh_build_beacon(struct ieee80211_if_mesh * ifmsh)947 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
948 {
949 	struct beacon_data *bcn;
950 	int head_len, tail_len;
951 	struct sk_buff *skb;
952 	struct ieee80211_mgmt *mgmt;
953 	struct mesh_csa_settings *csa;
954 	const struct ieee80211_supported_band *sband;
955 	u8 ie_len_he_cap, ie_len_eht_cap;
956 	u8 *pos;
957 	struct ieee80211_sub_if_data *sdata;
958 	int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
959 	u32 rate_flags;
960 
961 	sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
962 
963 	sband = ieee80211_get_sband(sdata);
964 	rate_flags =
965 		ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chanreq.oper);
966 
967 	ie_len_he_cap = ieee80211_ie_len_he_cap(sdata);
968 	ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata);
969 	head_len = hdr_len +
970 		   2 + /* NULL SSID */
971 		   /* Channel Switch Announcement */
972 		   2 + sizeof(struct ieee80211_channel_sw_ie) +
973 		   /* Mesh Channel Switch Parameters */
974 		   2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
975 		   /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
976 		   2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
977 		   2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
978 		   2 + 8 + /* supported rates */
979 		   2 + 3; /* DS params */
980 	tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
981 		   2 + sizeof(struct ieee80211_ht_cap) +
982 		   2 + sizeof(struct ieee80211_ht_operation) +
983 		   2 + ifmsh->mesh_id_len +
984 		   2 + sizeof(struct ieee80211_meshconf_ie) +
985 		   2 + sizeof(__le16) + /* awake window */
986 		   2 + sizeof(struct ieee80211_vht_cap) +
987 		   2 + sizeof(struct ieee80211_vht_operation) +
988 		   ie_len_he_cap +
989 		   2 + 1 + sizeof(struct ieee80211_he_operation) +
990 			   sizeof(struct ieee80211_he_6ghz_oper) +
991 		   2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
992 		   ie_len_eht_cap +
993 		   2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
994 			   offsetof(struct ieee80211_eht_operation_info, optional) +
995 		   ifmsh->ie_len;
996 
997 	bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
998 	/* need an skb for IE builders to operate on */
999 	skb = __dev_alloc_skb(max(head_len, tail_len), GFP_KERNEL);
1000 
1001 	if (!bcn || !skb)
1002 		goto out_free;
1003 
1004 	/*
1005 	 * pointers go into the block we allocated,
1006 	 * memory is | beacon_data | head | tail |
1007 	 */
1008 	bcn->head = ((u8 *) bcn) + sizeof(*bcn);
1009 
1010 	/* fill in the head */
1011 	mgmt = skb_put_zero(skb, hdr_len);
1012 	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1013 					  IEEE80211_STYPE_BEACON);
1014 	eth_broadcast_addr(mgmt->da);
1015 	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1016 	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
1017 	ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
1018 	mgmt->u.beacon.beacon_int =
1019 		cpu_to_le16(sdata->vif.bss_conf.beacon_int);
1020 	mgmt->u.beacon.capab_info |= cpu_to_le16(
1021 		sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
1022 
1023 	pos = skb_put(skb, 2);
1024 	*pos++ = WLAN_EID_SSID;
1025 	*pos++ = 0x0;
1026 
1027 	rcu_read_lock();
1028 	csa = rcu_dereference(ifmsh->csa);
1029 	if (csa) {
1030 		enum nl80211_channel_type ct;
1031 		struct cfg80211_chan_def *chandef;
1032 		int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
1033 			     2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
1034 
1035 		pos = skb_put_zero(skb, ie_len);
1036 		*pos++ = WLAN_EID_CHANNEL_SWITCH;
1037 		*pos++ = 3;
1038 		*pos++ = 0x0;
1039 		*pos++ = ieee80211_frequency_to_channel(
1040 				csa->settings.chandef.chan->center_freq);
1041 		bcn->cntdwn_current_counter = csa->settings.count;
1042 		bcn->cntdwn_counter_offsets[0] = hdr_len + 6;
1043 		*pos++ = csa->settings.count;
1044 		*pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
1045 		*pos++ = 6;
1046 		if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
1047 			*pos++ = ifmsh->mshcfg.dot11MeshTTL;
1048 			*pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1049 		} else {
1050 			*pos++ = ifmsh->chsw_ttl;
1051 		}
1052 		*pos++ |= csa->settings.block_tx ?
1053 			  WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
1054 		put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
1055 		pos += 2;
1056 		put_unaligned_le16(ifmsh->pre_value, pos);
1057 		pos += 2;
1058 
1059 		switch (csa->settings.chandef.width) {
1060 		case NL80211_CHAN_WIDTH_40:
1061 			ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1062 			pos = skb_put_zero(skb, ie_len);
1063 
1064 			*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
1065 			*pos++ = 1;				    /* len */
1066 			ct = cfg80211_get_chandef_type(&csa->settings.chandef);
1067 			if (ct == NL80211_CHAN_HT40PLUS)
1068 				*pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1069 			else
1070 				*pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1071 			break;
1072 		case NL80211_CHAN_WIDTH_80:
1073 		case NL80211_CHAN_WIDTH_80P80:
1074 		case NL80211_CHAN_WIDTH_160:
1075 			/* Channel Switch Wrapper + Wide Bandwidth CSA IE */
1076 			ie_len = 2 + 2 +
1077 				 sizeof(struct ieee80211_wide_bw_chansw_ie);
1078 			pos = skb_put_zero(skb, ie_len);
1079 
1080 			*pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
1081 			*pos++ = 5;				  /* len */
1082 			/* put sub IE */
1083 			chandef = &csa->settings.chandef;
1084 			ieee80211_ie_build_wide_bw_cs(pos, chandef);
1085 			break;
1086 		default:
1087 			break;
1088 		}
1089 	}
1090 	rcu_read_unlock();
1091 
1092 	if (ieee80211_put_srates_elem(skb, sband,
1093 				      sdata->vif.bss_conf.basic_rates,
1094 				      rate_flags, 0, WLAN_EID_SUPP_RATES) ||
1095 	    mesh_add_ds_params_ie(sdata, skb))
1096 		goto out_free;
1097 
1098 	bcn->head_len = skb->len;
1099 	memcpy(bcn->head, skb->data, bcn->head_len);
1100 
1101 	/* now the tail */
1102 	skb_trim(skb, 0);
1103 	bcn->tail = bcn->head + bcn->head_len;
1104 
1105 	if (ieee80211_put_srates_elem(skb, sband,
1106 				      sdata->vif.bss_conf.basic_rates,
1107 				      rate_flags, 0, WLAN_EID_EXT_SUPP_RATES) ||
1108 	    mesh_add_rsn_ie(sdata, skb) ||
1109 	    mesh_add_ht_cap_ie(sdata, skb) ||
1110 	    mesh_add_ht_oper_ie(sdata, skb) ||
1111 	    mesh_add_meshid_ie(sdata, skb) ||
1112 	    mesh_add_meshconf_ie(sdata, skb) ||
1113 	    mesh_add_awake_window_ie(sdata, skb) ||
1114 	    mesh_add_vht_cap_ie(sdata, skb) ||
1115 	    mesh_add_vht_oper_ie(sdata, skb) ||
1116 	    mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
1117 	    mesh_add_he_oper_ie(sdata, skb) ||
1118 	    mesh_add_he_6ghz_cap_ie(sdata, skb) ||
1119 	    mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
1120 	    mesh_add_eht_oper_ie(sdata, skb) ||
1121 	    mesh_add_vendor_ies(sdata, skb))
1122 		goto out_free;
1123 
1124 	bcn->tail_len = skb->len;
1125 	memcpy(bcn->tail, skb->data, bcn->tail_len);
1126 	ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len);
1127 	bcn->meshconf = (struct ieee80211_meshconf_ie *)
1128 					(bcn->tail + ifmsh->meshconf_offset);
1129 
1130 	dev_kfree_skb(skb);
1131 	rcu_assign_pointer(ifmsh->beacon, bcn);
1132 	return 0;
1133 out_free:
1134 	kfree(bcn);
1135 	dev_kfree_skb(skb);
1136 	return -ENOMEM;
1137 }
1138 
1139 static int
ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data * sdata)1140 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
1141 {
1142 	struct beacon_data *old_bcn;
1143 	int ret;
1144 
1145 	old_bcn = sdata_dereference(sdata->u.mesh.beacon, sdata);
1146 	ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
1147 	if (ret)
1148 		/* just reuse old beacon */
1149 		return ret;
1150 
1151 	if (old_bcn)
1152 		kfree_rcu(old_bcn, rcu_head);
1153 	return 0;
1154 }
1155 
ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data * sdata,u64 changed)1156 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1157 				       u64 changed)
1158 {
1159 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1160 	unsigned long bits[] = { BITMAP_FROM_U64(changed) };
1161 	u32 bit;
1162 
1163 	if (!changed)
1164 		return;
1165 
1166 	/* if we race with running work, worst case this work becomes a noop */
1167 	for_each_set_bit(bit, bits, sizeof(changed) * BITS_PER_BYTE)
1168 		set_bit(bit, ifmsh->mbss_changed);
1169 	set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
1170 	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1171 }
1172 
ieee80211_start_mesh(struct ieee80211_sub_if_data * sdata)1173 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
1174 {
1175 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1176 	struct ieee80211_local *local = sdata->local;
1177 	u64 changed = BSS_CHANGED_BEACON |
1178 		      BSS_CHANGED_BEACON_ENABLED |
1179 		      BSS_CHANGED_HT |
1180 		      BSS_CHANGED_BASIC_RATES |
1181 		      BSS_CHANGED_BEACON_INT |
1182 		      BSS_CHANGED_MCAST_RATE;
1183 
1184 	local->fif_other_bss++;
1185 	/* mesh ifaces must set allmulti to forward mcast traffic */
1186 	atomic_inc(&local->iff_allmultis);
1187 	ieee80211_configure_filter(local);
1188 
1189 	ifmsh->mesh_cc_id = 0;	/* Disabled */
1190 	/* register sync ops from extensible synchronization framework */
1191 	ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1192 	ifmsh->sync_offset_clockdrift_max = 0;
1193 	set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1194 	ieee80211_mesh_root_setup(ifmsh);
1195 	wiphy_work_queue(local->hw.wiphy, &sdata->work);
1196 	sdata->vif.bss_conf.ht_operation_mode =
1197 				ifmsh->mshcfg.ht_opmode;
1198 	sdata->vif.bss_conf.enable_beacon = true;
1199 
1200 	changed |= ieee80211_mps_local_status_update(sdata);
1201 
1202 	if (ieee80211_mesh_build_beacon(ifmsh)) {
1203 		ieee80211_stop_mesh(sdata);
1204 		return -ENOMEM;
1205 	}
1206 
1207 	ieee80211_recalc_dtim(local, sdata);
1208 	ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1209 
1210 	netif_carrier_on(sdata->dev);
1211 	return 0;
1212 }
1213 
ieee80211_stop_mesh(struct ieee80211_sub_if_data * sdata)1214 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1215 {
1216 	struct ieee80211_local *local = sdata->local;
1217 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1218 	struct beacon_data *bcn;
1219 
1220 	netif_carrier_off(sdata->dev);
1221 
1222 	/* flush STAs and mpaths on this iface */
1223 	sta_info_flush(sdata, -1);
1224 	ieee80211_free_keys(sdata, true);
1225 	mesh_path_flush_by_iface(sdata);
1226 
1227 	/* stop the beacon */
1228 	ifmsh->mesh_id_len = 0;
1229 	sdata->vif.bss_conf.enable_beacon = false;
1230 	sdata->beacon_rate_set = false;
1231 	clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1232 	ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1233 					  BSS_CHANGED_BEACON_ENABLED);
1234 
1235 	/* remove beacon */
1236 	bcn = sdata_dereference(ifmsh->beacon, sdata);
1237 	RCU_INIT_POINTER(ifmsh->beacon, NULL);
1238 	kfree_rcu(bcn, rcu_head);
1239 
1240 	/* free all potentially still buffered group-addressed frames */
1241 	local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1242 	skb_queue_purge(&ifmsh->ps.bc_buf);
1243 
1244 	del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1245 	del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1246 	del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1247 
1248 	/* clear any mesh work (for next join) we may have accrued */
1249 	ifmsh->wrkq_flags = 0;
1250 	memset(ifmsh->mbss_changed, 0, sizeof(ifmsh->mbss_changed));
1251 
1252 	local->fif_other_bss--;
1253 	atomic_dec(&local->iff_allmultis);
1254 	ieee80211_configure_filter(local);
1255 }
1256 
ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data * sdata)1257 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1258 {
1259 	int err;
1260 
1261 	/* if the current channel is a DFS channel, mark the channel as
1262 	 * unavailable.
1263 	 */
1264 	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1265 					    &sdata->vif.bss_conf.chanreq.oper,
1266 					    NL80211_IFTYPE_MESH_POINT);
1267 	if (err > 0)
1268 		cfg80211_radar_event(sdata->local->hw.wiphy,
1269 				     &sdata->vif.bss_conf.chanreq.oper,
1270 				     GFP_ATOMIC);
1271 }
1272 
1273 static bool
ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)1274 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1275 				 struct ieee802_11_elems *elems, bool beacon)
1276 {
1277 	struct cfg80211_csa_settings params;
1278 	struct ieee80211_csa_ie csa_ie;
1279 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1280 	struct ieee80211_supported_band *sband;
1281 	int err;
1282 	struct ieee80211_conn_settings conn = ieee80211_conn_settings_unlimited;
1283 	u32 vht_cap_info = 0;
1284 
1285 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1286 
1287 	sband = ieee80211_get_sband(sdata);
1288 	if (!sband)
1289 		return false;
1290 
1291 	switch (sdata->vif.bss_conf.chanreq.oper.width) {
1292 	case NL80211_CHAN_WIDTH_20_NOHT:
1293 		conn.mode = IEEE80211_CONN_MODE_LEGACY;
1294 		conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20;
1295 		break;
1296 	case NL80211_CHAN_WIDTH_20:
1297 		conn.mode = IEEE80211_CONN_MODE_HT;
1298 		conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20;
1299 		break;
1300 	case NL80211_CHAN_WIDTH_40:
1301 		conn.mode = IEEE80211_CONN_MODE_HT;
1302 		conn.bw_limit = IEEE80211_CONN_BW_LIMIT_40;
1303 		break;
1304 	default:
1305 		break;
1306 	}
1307 
1308 	if (elems->vht_cap_elem)
1309 		vht_cap_info =
1310 			le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1311 
1312 	memset(&params, 0, sizeof(params));
1313 	err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1314 					   vht_cap_info, &conn,
1315 					   sdata->vif.addr, false,
1316 					   &csa_ie);
1317 	if (err < 0)
1318 		return false;
1319 	if (err)
1320 		return false;
1321 
1322 	/* Mark the channel unavailable if the reason for the switch is
1323 	 * regulatory.
1324 	 */
1325 	if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1326 		ieee80211_mesh_csa_mark_radar(sdata);
1327 
1328 	params.chandef = csa_ie.chanreq.oper;
1329 	params.count = csa_ie.count;
1330 
1331 	if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1332 				     IEEE80211_CHAN_DISABLED) ||
1333 	    !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1334 				     NL80211_IFTYPE_MESH_POINT)) {
1335 		sdata_info(sdata,
1336 			   "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1337 			   sdata->vif.addr,
1338 			   params.chandef.chan->center_freq,
1339 			   params.chandef.width,
1340 			   params.chandef.center_freq1,
1341 			   params.chandef.center_freq2);
1342 		return false;
1343 	}
1344 
1345 	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1346 					    &params.chandef,
1347 					    NL80211_IFTYPE_MESH_POINT);
1348 	if (err < 0)
1349 		return false;
1350 	if (err > 0 && !ifmsh->userspace_handles_dfs) {
1351 		sdata_info(sdata,
1352 			   "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1353 			   sdata->vif.addr,
1354 			   params.chandef.chan->center_freq,
1355 			   params.chandef.width,
1356 			   params.chandef.center_freq1,
1357 			   params.chandef.center_freq2);
1358 		return false;
1359 	}
1360 
1361 	params.radar_required = err;
1362 
1363 	if (cfg80211_chandef_identical(&params.chandef,
1364 				       &sdata->vif.bss_conf.chanreq.oper)) {
1365 		mcsa_dbg(sdata,
1366 			 "received csa with an identical chandef, ignoring\n");
1367 		return true;
1368 	}
1369 
1370 	mcsa_dbg(sdata,
1371 		 "received channel switch announcement to go to channel %d MHz\n",
1372 		 params.chandef.chan->center_freq);
1373 
1374 	params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1375 	if (beacon) {
1376 		ifmsh->chsw_ttl = csa_ie.ttl - 1;
1377 		if (ifmsh->pre_value >= csa_ie.pre_value)
1378 			return false;
1379 		ifmsh->pre_value = csa_ie.pre_value;
1380 	}
1381 
1382 	if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1383 		return false;
1384 
1385 	ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1386 
1387 	if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1388 				     &params) < 0)
1389 		return false;
1390 
1391 	return true;
1392 }
1393 
1394 static void
ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1395 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1396 			    struct ieee80211_mgmt *mgmt, size_t len)
1397 {
1398 	struct ieee80211_local *local = sdata->local;
1399 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1400 	struct sk_buff *presp;
1401 	struct beacon_data *bcn;
1402 	struct ieee80211_mgmt *hdr;
1403 	struct ieee802_11_elems *elems;
1404 	size_t baselen;
1405 	u8 *pos;
1406 
1407 	pos = mgmt->u.probe_req.variable;
1408 	baselen = (u8 *) pos - (u8 *) mgmt;
1409 	if (baselen > len)
1410 		return;
1411 
1412 	elems = ieee802_11_parse_elems(pos, len - baselen, false, NULL);
1413 	if (!elems)
1414 		return;
1415 
1416 	if (!elems->mesh_id)
1417 		goto free;
1418 
1419 	/* 802.11-2012 10.1.4.3.2 */
1420 	if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1421 	     !is_broadcast_ether_addr(mgmt->da)) ||
1422 	    elems->ssid_len != 0)
1423 		goto free;
1424 
1425 	if (elems->mesh_id_len != 0 &&
1426 	    (elems->mesh_id_len != ifmsh->mesh_id_len ||
1427 	     memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1428 		goto free;
1429 
1430 	rcu_read_lock();
1431 	bcn = rcu_dereference(ifmsh->beacon);
1432 
1433 	if (!bcn)
1434 		goto out;
1435 
1436 	presp = dev_alloc_skb(local->tx_headroom +
1437 			      bcn->head_len + bcn->tail_len);
1438 	if (!presp)
1439 		goto out;
1440 
1441 	skb_reserve(presp, local->tx_headroom);
1442 	skb_put_data(presp, bcn->head, bcn->head_len);
1443 	skb_put_data(presp, bcn->tail, bcn->tail_len);
1444 	hdr = (struct ieee80211_mgmt *) presp->data;
1445 	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1446 					 IEEE80211_STYPE_PROBE_RESP);
1447 	memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1448 	IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1449 	ieee80211_tx_skb(sdata, presp);
1450 out:
1451 	rcu_read_unlock();
1452 free:
1453 	kfree(elems);
1454 }
1455 
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)1456 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1457 					u16 stype,
1458 					struct ieee80211_mgmt *mgmt,
1459 					size_t len,
1460 					struct ieee80211_rx_status *rx_status)
1461 {
1462 	struct ieee80211_local *local = sdata->local;
1463 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1464 	struct ieee802_11_elems *elems;
1465 	struct ieee80211_channel *channel;
1466 	size_t baselen;
1467 	int freq;
1468 	enum nl80211_band band = rx_status->band;
1469 
1470 	/* ignore ProbeResp to foreign address */
1471 	if (stype == IEEE80211_STYPE_PROBE_RESP &&
1472 	    !ether_addr_equal(mgmt->da, sdata->vif.addr))
1473 		return;
1474 
1475 	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1476 	if (baselen > len)
1477 		return;
1478 
1479 	elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1480 				       len - baselen,
1481 				       false, NULL);
1482 	if (!elems)
1483 		return;
1484 
1485 	/* ignore non-mesh or secure / insecure mismatch */
1486 	if ((!elems->mesh_id || !elems->mesh_config) ||
1487 	    (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1488 	    (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1489 		goto free;
1490 
1491 	if (elems->ds_params)
1492 		freq = ieee80211_channel_to_frequency(elems->ds_params[0], band);
1493 	else
1494 		freq = rx_status->freq;
1495 
1496 	channel = ieee80211_get_channel(local->hw.wiphy, freq);
1497 
1498 	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1499 		goto free;
1500 
1501 	if (mesh_matches_local(sdata, elems)) {
1502 		mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1503 			sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1504 		if (!sdata->u.mesh.user_mpm ||
1505 		    sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1506 		    sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1507 			mesh_neighbour_update(sdata, mgmt->sa, elems,
1508 					      rx_status);
1509 
1510 		if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1511 		    !sdata->vif.bss_conf.csa_active)
1512 			ieee80211_mesh_process_chnswitch(sdata, elems, true);
1513 	}
1514 
1515 	if (ifmsh->sync_ops)
1516 		ifmsh->sync_ops->rx_bcn_presp(sdata, stype, mgmt, len,
1517 					      elems->mesh_config, rx_status);
1518 free:
1519 	kfree(elems);
1520 }
1521 
ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data * sdata,u64 * changed)1522 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
1523 {
1524 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1525 	struct mesh_csa_settings *tmp_csa_settings;
1526 	int ret = 0;
1527 
1528 	/* Reset the TTL value and Initiator flag */
1529 	ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1530 	ifmsh->chsw_ttl = 0;
1531 
1532 	/* Remove the CSA and MCSP elements from the beacon */
1533 	tmp_csa_settings = sdata_dereference(ifmsh->csa, sdata);
1534 	RCU_INIT_POINTER(ifmsh->csa, NULL);
1535 	if (tmp_csa_settings)
1536 		kfree_rcu(tmp_csa_settings, rcu_head);
1537 	ret = ieee80211_mesh_rebuild_beacon(sdata);
1538 	if (ret)
1539 		return -EINVAL;
1540 
1541 	*changed |= BSS_CHANGED_BEACON;
1542 
1543 	mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1544 		 sdata->vif.bss_conf.chanreq.oper.chan->center_freq);
1545 	return 0;
1546 }
1547 
ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings,u64 * changed)1548 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1549 			      struct cfg80211_csa_settings *csa_settings,
1550 			      u64 *changed)
1551 {
1552 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1553 	struct mesh_csa_settings *tmp_csa_settings;
1554 	int ret = 0;
1555 
1556 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1557 
1558 	tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1559 				   GFP_ATOMIC);
1560 	if (!tmp_csa_settings)
1561 		return -ENOMEM;
1562 
1563 	memcpy(&tmp_csa_settings->settings, csa_settings,
1564 	       sizeof(struct cfg80211_csa_settings));
1565 
1566 	rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1567 
1568 	ret = ieee80211_mesh_rebuild_beacon(sdata);
1569 	if (ret) {
1570 		tmp_csa_settings = rcu_dereference(ifmsh->csa);
1571 		RCU_INIT_POINTER(ifmsh->csa, NULL);
1572 		kfree_rcu(tmp_csa_settings, rcu_head);
1573 		return ret;
1574 	}
1575 
1576 	*changed |= BSS_CHANGED_BEACON;
1577 	return 0;
1578 }
1579 
mesh_fwd_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee802_11_elems * elems)1580 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1581 			       struct ieee80211_mgmt *mgmt, size_t len,
1582 			       struct ieee802_11_elems *elems)
1583 {
1584 	struct ieee80211_mgmt *mgmt_fwd;
1585 	struct sk_buff *skb;
1586 	struct ieee80211_local *local = sdata->local;
1587 
1588 	skb = dev_alloc_skb(local->tx_headroom + len);
1589 	if (!skb)
1590 		return -ENOMEM;
1591 	skb_reserve(skb, local->tx_headroom);
1592 	mgmt_fwd = skb_put(skb, len);
1593 
1594 	elems->mesh_chansw_params_ie->mesh_ttl--;
1595 	elems->mesh_chansw_params_ie->mesh_flags &=
1596 		~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1597 
1598 	memcpy(mgmt_fwd, mgmt, len);
1599 	eth_broadcast_addr(mgmt_fwd->da);
1600 	memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1601 	memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1602 
1603 	ieee80211_tx_skb(sdata, skb);
1604 	return 0;
1605 }
1606 
mesh_rx_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1607 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1608 			      struct ieee80211_mgmt *mgmt, size_t len)
1609 {
1610 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1611 	struct ieee802_11_elems *elems;
1612 	u16 pre_value;
1613 	bool fwd_csa = true;
1614 	size_t baselen;
1615 	u8 *pos;
1616 
1617 	if (mgmt->u.action.u.measurement.action_code !=
1618 	    WLAN_ACTION_SPCT_CHL_SWITCH)
1619 		return;
1620 
1621 	pos = mgmt->u.action.u.chan_switch.variable;
1622 	baselen = offsetof(struct ieee80211_mgmt,
1623 			   u.action.u.chan_switch.variable);
1624 	elems = ieee802_11_parse_elems(pos, len - baselen, true, NULL);
1625 	if (!elems)
1626 		return;
1627 
1628 	if (!mesh_matches_local(sdata, elems))
1629 		goto free;
1630 
1631 	ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl;
1632 	if (!--ifmsh->chsw_ttl)
1633 		fwd_csa = false;
1634 
1635 	pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value);
1636 	if (ifmsh->pre_value >= pre_value)
1637 		goto free;
1638 
1639 	ifmsh->pre_value = pre_value;
1640 
1641 	if (!sdata->vif.bss_conf.csa_active &&
1642 	    !ieee80211_mesh_process_chnswitch(sdata, elems, false)) {
1643 		mcsa_dbg(sdata, "Failed to process CSA action frame");
1644 		goto free;
1645 	}
1646 
1647 	/* forward or re-broadcast the CSA frame */
1648 	if (fwd_csa) {
1649 		if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0)
1650 			mcsa_dbg(sdata, "Failed to forward the CSA frame");
1651 	}
1652 free:
1653 	kfree(elems);
1654 }
1655 
ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1656 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1657 					  struct ieee80211_mgmt *mgmt,
1658 					  size_t len,
1659 					  struct ieee80211_rx_status *rx_status)
1660 {
1661 	switch (mgmt->u.action.category) {
1662 	case WLAN_CATEGORY_SELF_PROTECTED:
1663 		switch (mgmt->u.action.u.self_prot.action_code) {
1664 		case WLAN_SP_MESH_PEERING_OPEN:
1665 		case WLAN_SP_MESH_PEERING_CLOSE:
1666 		case WLAN_SP_MESH_PEERING_CONFIRM:
1667 			mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1668 			break;
1669 		}
1670 		break;
1671 	case WLAN_CATEGORY_MESH_ACTION:
1672 		if (mesh_action_is_path_sel(mgmt))
1673 			mesh_rx_path_sel_frame(sdata, mgmt, len);
1674 		break;
1675 	case WLAN_CATEGORY_SPECTRUM_MGMT:
1676 		mesh_rx_csa_frame(sdata, mgmt, len);
1677 		break;
1678 	}
1679 }
1680 
ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1681 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1682 				   struct sk_buff *skb)
1683 {
1684 	struct ieee80211_rx_status *rx_status;
1685 	struct ieee80211_mgmt *mgmt;
1686 	u16 stype;
1687 
1688 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1689 
1690 	/* mesh already went down */
1691 	if (!sdata->u.mesh.mesh_id_len)
1692 		return;
1693 
1694 	rx_status = IEEE80211_SKB_RXCB(skb);
1695 	mgmt = (struct ieee80211_mgmt *) skb->data;
1696 	stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1697 
1698 	switch (stype) {
1699 	case IEEE80211_STYPE_PROBE_RESP:
1700 	case IEEE80211_STYPE_BEACON:
1701 		ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1702 					    rx_status);
1703 		break;
1704 	case IEEE80211_STYPE_PROBE_REQ:
1705 		ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1706 		break;
1707 	case IEEE80211_STYPE_ACTION:
1708 		ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1709 		break;
1710 	}
1711 }
1712 
mesh_bss_info_changed(struct ieee80211_sub_if_data * sdata)1713 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1714 {
1715 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1716 	u32 bit;
1717 	u64 changed = 0;
1718 
1719 	for_each_set_bit(bit, ifmsh->mbss_changed,
1720 			 sizeof(changed) * BITS_PER_BYTE) {
1721 		clear_bit(bit, ifmsh->mbss_changed);
1722 		changed |= BIT(bit);
1723 	}
1724 
1725 	if (sdata->vif.bss_conf.enable_beacon &&
1726 	    (changed & (BSS_CHANGED_BEACON |
1727 			BSS_CHANGED_HT |
1728 			BSS_CHANGED_BASIC_RATES |
1729 			BSS_CHANGED_BEACON_INT)))
1730 		if (ieee80211_mesh_rebuild_beacon(sdata))
1731 			return;
1732 
1733 	ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1734 }
1735 
ieee80211_mesh_work(struct ieee80211_sub_if_data * sdata)1736 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1737 {
1738 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1739 
1740 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1741 
1742 	/* mesh already went down */
1743 	if (!sdata->u.mesh.mesh_id_len)
1744 		return;
1745 
1746 	if (ifmsh->preq_queue_len &&
1747 	    time_after(jiffies,
1748 		       ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1749 		mesh_path_start_discovery(sdata);
1750 
1751 	if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1752 		ieee80211_mesh_housekeeping(sdata);
1753 
1754 	if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1755 		ieee80211_mesh_rootpath(sdata);
1756 
1757 	if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1758 		mesh_sync_adjust_tsf(sdata);
1759 
1760 	if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1761 		mesh_bss_info_changed(sdata);
1762 }
1763 
1764 
ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data * sdata)1765 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1766 {
1767 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1768 	static u8 zero_addr[ETH_ALEN] = {};
1769 
1770 	timer_setup(&ifmsh->housekeeping_timer,
1771 		    ieee80211_mesh_housekeeping_timer, 0);
1772 
1773 	ifmsh->accepting_plinks = true;
1774 	atomic_set(&ifmsh->mpaths, 0);
1775 	mesh_rmc_init(sdata);
1776 	ifmsh->last_preq = jiffies;
1777 	ifmsh->next_perr = jiffies;
1778 	ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1779 	ifmsh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
1780 	/* Allocate all mesh structures when creating the first mesh interface. */
1781 	if (!mesh_allocated)
1782 		ieee80211s_init();
1783 
1784 	mesh_pathtbl_init(sdata);
1785 
1786 	timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1787 	timer_setup(&ifmsh->mesh_path_root_timer,
1788 		    ieee80211_mesh_path_root_timer, 0);
1789 	INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1790 	skb_queue_head_init(&ifmsh->ps.bc_buf);
1791 	spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1792 	spin_lock_init(&ifmsh->sync_offset_lock);
1793 	RCU_INIT_POINTER(ifmsh->beacon, NULL);
1794 
1795 	sdata->vif.bss_conf.bssid = zero_addr;
1796 }
1797 
ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data * sdata)1798 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1799 {
1800 	mesh_rmc_free(sdata);
1801 	mesh_pathtbl_unregister(sdata);
1802 }
1803