1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2008, 2009 open80211s Ltd.
4  * Copyright (C) 2018 - 2022 Intel Corporation
5  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
6  * 	       Javier Cardona <javier@cozybit.com>
7  */
8 
9 #include <linux/slab.h>
10 #include <asm/unaligned.h>
11 #include "ieee80211_i.h"
12 #include "mesh.h"
13 #include "driver-ops.h"
14 
15 static int mesh_allocated;
16 static struct kmem_cache *rm_cache;
17 
mesh_action_is_path_sel(struct ieee80211_mgmt * mgmt)18 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
19 {
20 	return (mgmt->u.action.u.mesh_action.action_code ==
21 			WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
22 }
23 
ieee80211s_init(void)24 void ieee80211s_init(void)
25 {
26 	mesh_allocated = 1;
27 	rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
28 				     0, 0, NULL);
29 }
30 
ieee80211s_stop(void)31 void ieee80211s_stop(void)
32 {
33 	if (!mesh_allocated)
34 		return;
35 	kmem_cache_destroy(rm_cache);
36 }
37 
ieee80211_mesh_housekeeping_timer(struct timer_list * t)38 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t)
39 {
40 	struct ieee80211_sub_if_data *sdata =
41 		from_timer(sdata, t, u.mesh.housekeeping_timer);
42 	struct ieee80211_local *local = sdata->local;
43 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
44 
45 	set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
46 
47 	ieee80211_queue_work(&local->hw, &sdata->work);
48 }
49 
50 /**
51  * mesh_matches_local - check if the config of a mesh point matches ours
52  *
53  * @sdata: local mesh subif
54  * @ie: information elements of a management frame from the mesh peer
55  *
56  * This function checks if the mesh configuration of a mesh point matches the
57  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
58  */
mesh_matches_local(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * ie)59 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
60 			struct ieee802_11_elems *ie)
61 {
62 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
63 	u32 basic_rates = 0;
64 	struct cfg80211_chan_def sta_chan_def;
65 	struct ieee80211_supported_band *sband;
66 	u32 vht_cap_info = 0;
67 
68 	/*
69 	 * As support for each feature is added, check for matching
70 	 * - On mesh config capabilities
71 	 *   - Power Save Support En
72 	 *   - Sync support enabled
73 	 *   - Sync support active
74 	 *   - Sync support required from peer
75 	 *   - MDA enabled
76 	 * - Power management control on fc
77 	 */
78 	if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
79 	     memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
80 	     (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
81 	     (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
82 	     (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
83 	     (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
84 	     (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
85 		return false;
86 
87 	sband = ieee80211_get_sband(sdata);
88 	if (!sband)
89 		return false;
90 
91 	ieee80211_sta_get_rates(sdata, ie, sband->band,
92 				&basic_rates);
93 
94 	if (sdata->vif.bss_conf.basic_rates != basic_rates)
95 		return false;
96 
97 	cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
98 				NL80211_CHAN_NO_HT);
99 	ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
100 
101 	if (ie->vht_cap_elem)
102 		vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info);
103 
104 	ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
105 				   ie->vht_operation, ie->ht_operation,
106 				   &sta_chan_def);
107 	ieee80211_chandef_he_6ghz_oper(sdata, ie->he_operation, NULL,
108 				       &sta_chan_def);
109 
110 	if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
111 					 &sta_chan_def))
112 		return false;
113 
114 	return true;
115 }
116 
117 /**
118  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
119  *
120  * @ie: information elements of a management frame from the mesh peer
121  */
mesh_peer_accepts_plinks(struct ieee802_11_elems * ie)122 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
123 {
124 	return (ie->mesh_config->meshconf_cap &
125 			IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
126 }
127 
128 /**
129  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
130  *
131  * @sdata: mesh interface in which mesh beacons are going to be updated
132  *
133  * Returns: beacon changed flag if the beacon content changed.
134  */
mesh_accept_plinks_update(struct ieee80211_sub_if_data * sdata)135 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
136 {
137 	bool free_plinks;
138 	u32 changed = 0;
139 
140 	/* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
141 	 * the mesh interface might be able to establish plinks with peers that
142 	 * are already on the table but are not on PLINK_ESTAB state. However,
143 	 * in general the mesh interface is not accepting peer link requests
144 	 * from new peers, and that must be reflected in the beacon
145 	 */
146 	free_plinks = mesh_plink_availables(sdata);
147 
148 	if (free_plinks != sdata->u.mesh.accepting_plinks) {
149 		sdata->u.mesh.accepting_plinks = free_plinks;
150 		changed = BSS_CHANGED_BEACON;
151 	}
152 
153 	return changed;
154 }
155 
156 /*
157  * mesh_sta_cleanup - clean up any mesh sta state
158  *
159  * @sta: mesh sta to clean up.
160  */
mesh_sta_cleanup(struct sta_info * sta)161 void mesh_sta_cleanup(struct sta_info *sta)
162 {
163 	struct ieee80211_sub_if_data *sdata = sta->sdata;
164 	u32 changed = mesh_plink_deactivate(sta);
165 
166 	if (changed)
167 		ieee80211_mbss_info_change_notify(sdata, changed);
168 }
169 
mesh_rmc_init(struct ieee80211_sub_if_data * sdata)170 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
171 {
172 	int i;
173 
174 	sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
175 	if (!sdata->u.mesh.rmc)
176 		return -ENOMEM;
177 	sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
178 	for (i = 0; i < RMC_BUCKETS; i++)
179 		INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
180 	return 0;
181 }
182 
mesh_rmc_free(struct ieee80211_sub_if_data * sdata)183 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
184 {
185 	struct mesh_rmc *rmc = sdata->u.mesh.rmc;
186 	struct rmc_entry *p;
187 	struct hlist_node *n;
188 	int i;
189 
190 	if (!sdata->u.mesh.rmc)
191 		return;
192 
193 	for (i = 0; i < RMC_BUCKETS; i++) {
194 		hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
195 			hlist_del(&p->list);
196 			kmem_cache_free(rm_cache, p);
197 		}
198 	}
199 
200 	kfree(rmc);
201 	sdata->u.mesh.rmc = NULL;
202 }
203 
204 /**
205  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
206  *
207  * @sdata:	interface
208  * @sa:		source address
209  * @mesh_hdr:	mesh_header
210  *
211  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
212  *
213  * Checks using the source address and the mesh sequence number if we have
214  * received this frame lately. If the frame is not in the cache, it is added to
215  * it.
216  */
mesh_rmc_check(struct ieee80211_sub_if_data * sdata,const u8 * sa,struct ieee80211s_hdr * mesh_hdr)217 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
218 		   const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
219 {
220 	struct mesh_rmc *rmc = sdata->u.mesh.rmc;
221 	u32 seqnum = 0;
222 	int entries = 0;
223 	u8 idx;
224 	struct rmc_entry *p;
225 	struct hlist_node *n;
226 
227 	if (!rmc)
228 		return -1;
229 
230 	/* Don't care about endianness since only match matters */
231 	memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
232 	idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
233 	hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
234 		++entries;
235 		if (time_after(jiffies, p->exp_time) ||
236 		    entries == RMC_QUEUE_MAX_LEN) {
237 			hlist_del(&p->list);
238 			kmem_cache_free(rm_cache, p);
239 			--entries;
240 		} else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
241 			return -1;
242 	}
243 
244 	p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
245 	if (!p)
246 		return 0;
247 
248 	p->seqnum = seqnum;
249 	p->exp_time = jiffies + RMC_TIMEOUT;
250 	memcpy(p->sa, sa, ETH_ALEN);
251 	hlist_add_head(&p->list, &rmc->bucket[idx]);
252 	return 0;
253 }
254 
mesh_add_meshconf_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)255 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
256 			 struct sk_buff *skb)
257 {
258 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
259 	u8 *pos, neighbors;
260 	u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
261 	bool is_connected_to_gate = ifmsh->num_gates > 0 ||
262 		ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
263 		ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
264 	bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
265 
266 	if (skb_tailroom(skb) < 2 + meshconf_len)
267 		return -ENOMEM;
268 
269 	pos = skb_put(skb, 2 + meshconf_len);
270 	*pos++ = WLAN_EID_MESH_CONFIG;
271 	*pos++ = meshconf_len;
272 
273 	/* save a pointer for quick updates in pre-tbtt */
274 	ifmsh->meshconf_offset = pos - skb->data;
275 
276 	/* Active path selection protocol ID */
277 	*pos++ = ifmsh->mesh_pp_id;
278 	/* Active path selection metric ID   */
279 	*pos++ = ifmsh->mesh_pm_id;
280 	/* Congestion control mode identifier */
281 	*pos++ = ifmsh->mesh_cc_id;
282 	/* Synchronization protocol identifier */
283 	*pos++ = ifmsh->mesh_sp_id;
284 	/* Authentication Protocol identifier */
285 	*pos++ = ifmsh->mesh_auth_id;
286 	/* Mesh Formation Info - number of neighbors */
287 	neighbors = atomic_read(&ifmsh->estab_plinks);
288 	neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
289 	*pos++ = (is_connected_to_as << 7) |
290 		 (neighbors << 1) |
291 		 is_connected_to_gate;
292 	/* Mesh capability */
293 	*pos = 0x00;
294 	*pos |= ifmsh->mshcfg.dot11MeshForwarding ?
295 			IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
296 	*pos |= ifmsh->accepting_plinks ?
297 			IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
298 	/* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
299 	*pos |= ifmsh->ps_peers_deep_sleep ?
300 			IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
301 	return 0;
302 }
303 
mesh_add_meshid_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)304 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
305 {
306 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
307 	u8 *pos;
308 
309 	if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
310 		return -ENOMEM;
311 
312 	pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
313 	*pos++ = WLAN_EID_MESH_ID;
314 	*pos++ = ifmsh->mesh_id_len;
315 	if (ifmsh->mesh_id_len)
316 		memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
317 
318 	return 0;
319 }
320 
mesh_add_awake_window_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)321 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
322 				    struct sk_buff *skb)
323 {
324 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
325 	u8 *pos;
326 
327 	/* see IEEE802.11-2012 13.14.6 */
328 	if (ifmsh->ps_peers_light_sleep == 0 &&
329 	    ifmsh->ps_peers_deep_sleep == 0 &&
330 	    ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
331 		return 0;
332 
333 	if (skb_tailroom(skb) < 4)
334 		return -ENOMEM;
335 
336 	pos = skb_put(skb, 2 + 2);
337 	*pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
338 	*pos++ = 2;
339 	put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
340 
341 	return 0;
342 }
343 
mesh_add_vendor_ies(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)344 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
345 			struct sk_buff *skb)
346 {
347 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
348 	u8 offset, len;
349 	const u8 *data;
350 
351 	if (!ifmsh->ie || !ifmsh->ie_len)
352 		return 0;
353 
354 	/* fast-forward to vendor IEs */
355 	offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
356 
357 	if (offset < ifmsh->ie_len) {
358 		len = ifmsh->ie_len - offset;
359 		data = ifmsh->ie + offset;
360 		if (skb_tailroom(skb) < len)
361 			return -ENOMEM;
362 		skb_put_data(skb, data, len);
363 	}
364 
365 	return 0;
366 }
367 
mesh_add_rsn_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)368 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
369 {
370 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
371 	u8 len = 0;
372 	const u8 *data;
373 
374 	if (!ifmsh->ie || !ifmsh->ie_len)
375 		return 0;
376 
377 	/* find RSN IE */
378 	data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
379 	if (!data)
380 		return 0;
381 
382 	len = data[1] + 2;
383 
384 	if (skb_tailroom(skb) < len)
385 		return -ENOMEM;
386 	skb_put_data(skb, data, len);
387 
388 	return 0;
389 }
390 
mesh_add_ds_params_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)391 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
392 				 struct sk_buff *skb)
393 {
394 	struct ieee80211_chanctx_conf *chanctx_conf;
395 	struct ieee80211_channel *chan;
396 	u8 *pos;
397 
398 	if (skb_tailroom(skb) < 3)
399 		return -ENOMEM;
400 
401 	rcu_read_lock();
402 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
403 	if (WARN_ON(!chanctx_conf)) {
404 		rcu_read_unlock();
405 		return -EINVAL;
406 	}
407 	chan = chanctx_conf->def.chan;
408 	rcu_read_unlock();
409 
410 	pos = skb_put(skb, 2 + 1);
411 	*pos++ = WLAN_EID_DS_PARAMS;
412 	*pos++ = 1;
413 	*pos++ = ieee80211_frequency_to_channel(chan->center_freq);
414 
415 	return 0;
416 }
417 
mesh_add_ht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)418 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
419 		       struct sk_buff *skb)
420 {
421 	struct ieee80211_supported_band *sband;
422 	u8 *pos;
423 
424 	sband = ieee80211_get_sband(sdata);
425 	if (!sband)
426 		return -EINVAL;
427 
428 	/* HT not allowed in 6 GHz */
429 	if (sband->band == NL80211_BAND_6GHZ)
430 		return 0;
431 
432 	if (!sband->ht_cap.ht_supported ||
433 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
434 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
435 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
436 		return 0;
437 
438 	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
439 		return -ENOMEM;
440 
441 	pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
442 	ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
443 
444 	return 0;
445 }
446 
mesh_add_ht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)447 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
448 			struct sk_buff *skb)
449 {
450 	struct ieee80211_local *local = sdata->local;
451 	struct ieee80211_chanctx_conf *chanctx_conf;
452 	struct ieee80211_channel *channel;
453 	struct ieee80211_supported_band *sband;
454 	struct ieee80211_sta_ht_cap *ht_cap;
455 	u8 *pos;
456 
457 	rcu_read_lock();
458 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
459 	if (WARN_ON(!chanctx_conf)) {
460 		rcu_read_unlock();
461 		return -EINVAL;
462 	}
463 	channel = chanctx_conf->def.chan;
464 	rcu_read_unlock();
465 
466 	sband = local->hw.wiphy->bands[channel->band];
467 	ht_cap = &sband->ht_cap;
468 
469 	/* HT not allowed in 6 GHz */
470 	if (sband->band == NL80211_BAND_6GHZ)
471 		return 0;
472 
473 	if (!ht_cap->ht_supported ||
474 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
475 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
476 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
477 		return 0;
478 
479 	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
480 		return -ENOMEM;
481 
482 	pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
483 	ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
484 				   sdata->vif.bss_conf.ht_operation_mode,
485 				   false);
486 
487 	return 0;
488 }
489 
mesh_add_vht_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)490 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
491 			struct sk_buff *skb)
492 {
493 	struct ieee80211_supported_band *sband;
494 	u8 *pos;
495 
496 	sband = ieee80211_get_sband(sdata);
497 	if (!sband)
498 		return -EINVAL;
499 
500 	/* VHT not allowed in 6 GHz */
501 	if (sband->band == NL80211_BAND_6GHZ)
502 		return 0;
503 
504 	if (!sband->vht_cap.vht_supported ||
505 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
506 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
507 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
508 		return 0;
509 
510 	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
511 		return -ENOMEM;
512 
513 	pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
514 	ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
515 
516 	return 0;
517 }
518 
mesh_add_vht_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)519 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
520 			 struct sk_buff *skb)
521 {
522 	struct ieee80211_local *local = sdata->local;
523 	struct ieee80211_chanctx_conf *chanctx_conf;
524 	struct ieee80211_channel *channel;
525 	struct ieee80211_supported_band *sband;
526 	struct ieee80211_sta_vht_cap *vht_cap;
527 	u8 *pos;
528 
529 	rcu_read_lock();
530 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
531 	if (WARN_ON(!chanctx_conf)) {
532 		rcu_read_unlock();
533 		return -EINVAL;
534 	}
535 	channel = chanctx_conf->def.chan;
536 	rcu_read_unlock();
537 
538 	sband = local->hw.wiphy->bands[channel->band];
539 	vht_cap = &sband->vht_cap;
540 
541 	/* VHT not allowed in 6 GHz */
542 	if (sband->band == NL80211_BAND_6GHZ)
543 		return 0;
544 
545 	if (!vht_cap->vht_supported ||
546 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
547 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
548 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
549 		return 0;
550 
551 	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
552 		return -ENOMEM;
553 
554 	pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
555 	ieee80211_ie_build_vht_oper(pos, vht_cap,
556 				    &sdata->vif.bss_conf.chandef);
557 
558 	return 0;
559 }
560 
mesh_add_he_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u8 ie_len)561 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
562 		       struct sk_buff *skb, u8 ie_len)
563 {
564 	const struct ieee80211_sta_he_cap *he_cap;
565 	struct ieee80211_supported_band *sband;
566 	u8 *pos;
567 
568 	sband = ieee80211_get_sband(sdata);
569 	if (!sband)
570 		return -EINVAL;
571 
572 	he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
573 
574 	if (!he_cap ||
575 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
576 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
577 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
578 		return 0;
579 
580 	if (skb_tailroom(skb) < ie_len)
581 		return -ENOMEM;
582 
583 	pos = skb_put(skb, ie_len);
584 	ieee80211_ie_build_he_cap(0, pos, he_cap, pos + ie_len);
585 
586 	return 0;
587 }
588 
mesh_add_he_oper_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)589 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
590 			struct sk_buff *skb)
591 {
592 	const struct ieee80211_sta_he_cap *he_cap;
593 	struct ieee80211_supported_band *sband;
594 	u32 len;
595 	u8 *pos;
596 
597 	sband = ieee80211_get_sband(sdata);
598 	if (!sband)
599 		return -EINVAL;
600 
601 	he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
602 	if (!he_cap ||
603 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
604 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
605 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
606 		return 0;
607 
608 	len = 2 + 1 + sizeof(struct ieee80211_he_operation);
609 	if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ)
610 		len += sizeof(struct ieee80211_he_6ghz_oper);
611 
612 	if (skb_tailroom(skb) < len)
613 		return -ENOMEM;
614 
615 	pos = skb_put(skb, len);
616 	ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef);
617 
618 	return 0;
619 }
620 
mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)621 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
622 			    struct sk_buff *skb)
623 {
624 	struct ieee80211_supported_band *sband;
625 	const struct ieee80211_sband_iftype_data *iftd;
626 
627 	sband = ieee80211_get_sband(sdata);
628 	if (!sband)
629 		return -EINVAL;
630 
631 	iftd = ieee80211_get_sband_iftype_data(sband,
632 					       NL80211_IFTYPE_MESH_POINT);
633 	/* The device doesn't support HE in mesh mode or at all */
634 	if (!iftd)
635 		return 0;
636 
637 	ieee80211_ie_build_he_6ghz_cap(sdata, skb);
638 	return 0;
639 }
640 
ieee80211_mesh_path_timer(struct timer_list * t)641 static void ieee80211_mesh_path_timer(struct timer_list *t)
642 {
643 	struct ieee80211_sub_if_data *sdata =
644 		from_timer(sdata, t, u.mesh.mesh_path_timer);
645 
646 	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
647 }
648 
ieee80211_mesh_path_root_timer(struct timer_list * t)649 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
650 {
651 	struct ieee80211_sub_if_data *sdata =
652 		from_timer(sdata, t, u.mesh.mesh_path_root_timer);
653 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
654 
655 	set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
656 
657 	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
658 }
659 
ieee80211_mesh_root_setup(struct ieee80211_if_mesh * ifmsh)660 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
661 {
662 	if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
663 		set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
664 	else {
665 		clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
666 		/* stop running timer */
667 		del_timer_sync(&ifmsh->mesh_path_root_timer);
668 	}
669 }
670 
671 static void
ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data * sdata,u8 * ie,u8 ie_len)672 ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
673 				 u8 *ie, u8 ie_len)
674 {
675 	struct ieee80211_supported_band *sband;
676 	const struct element *cap;
677 	const struct ieee80211_he_operation *he_oper = NULL;
678 
679 	sband = ieee80211_get_sband(sdata);
680 	if (!sband)
681 		return;
682 
683 	if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) ||
684 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
685 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
686 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
687 		return;
688 
689 	sdata->vif.bss_conf.he_support = true;
690 
691 	cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
692 	if (cap && cap->datalen >= 1 + sizeof(*he_oper) &&
693 	    cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1))
694 		he_oper = (void *)(cap->data + 1);
695 
696 	if (he_oper)
697 		sdata->vif.bss_conf.he_oper.params =
698 			__le32_to_cpu(he_oper->he_oper_params);
699 }
700 
701 /**
702  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
703  * @hdr:	802.11 frame header
704  * @fc:		frame control field
705  * @meshda:	destination address in the mesh
706  * @meshsa:	source address in the mesh.  Same as TA, as frame is
707  *              locally originated.
708  *
709  * Return the length of the 802.11 (does not include a mesh control header)
710  */
ieee80211_fill_mesh_addresses(struct ieee80211_hdr * hdr,__le16 * fc,const u8 * meshda,const u8 * meshsa)711 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
712 				  const u8 *meshda, const u8 *meshsa)
713 {
714 	if (is_multicast_ether_addr(meshda)) {
715 		*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
716 		/* DA TA SA */
717 		memcpy(hdr->addr1, meshda, ETH_ALEN);
718 		memcpy(hdr->addr2, meshsa, ETH_ALEN);
719 		memcpy(hdr->addr3, meshsa, ETH_ALEN);
720 		return 24;
721 	} else {
722 		*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
723 		/* RA TA DA SA */
724 		eth_zero_addr(hdr->addr1);   /* RA is resolved later */
725 		memcpy(hdr->addr2, meshsa, ETH_ALEN);
726 		memcpy(hdr->addr3, meshda, ETH_ALEN);
727 		memcpy(hdr->addr4, meshsa, ETH_ALEN);
728 		return 30;
729 	}
730 }
731 
732 /**
733  * ieee80211_new_mesh_header - create a new mesh header
734  * @sdata:	mesh interface to be used
735  * @meshhdr:    uninitialized mesh header
736  * @addr4or5:   1st address in the ae header, which may correspond to address 4
737  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
738  *              be NULL.
739  * @addr6:	2nd address in the ae header, which corresponds to addr6 of the
740  *              mesh frame
741  *
742  * Return the header length.
743  */
ieee80211_new_mesh_header(struct ieee80211_sub_if_data * sdata,struct ieee80211s_hdr * meshhdr,const char * addr4or5,const char * addr6)744 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
745 				       struct ieee80211s_hdr *meshhdr,
746 				       const char *addr4or5, const char *addr6)
747 {
748 	if (WARN_ON(!addr4or5 && addr6))
749 		return 0;
750 
751 	memset(meshhdr, 0, sizeof(*meshhdr));
752 
753 	meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
754 
755 	/* FIXME: racy -- TX on multiple queues can be concurrent */
756 	put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
757 	sdata->u.mesh.mesh_seqnum++;
758 
759 	if (addr4or5 && !addr6) {
760 		meshhdr->flags |= MESH_FLAGS_AE_A4;
761 		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
762 		return 2 * ETH_ALEN;
763 	} else if (addr4or5 && addr6) {
764 		meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
765 		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
766 		memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
767 		return 3 * ETH_ALEN;
768 	}
769 
770 	return ETH_ALEN;
771 }
772 
ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data * sdata)773 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
774 {
775 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
776 	u32 changed;
777 
778 	if (ifmsh->mshcfg.plink_timeout > 0)
779 		ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
780 	mesh_path_expire(sdata);
781 
782 	changed = mesh_accept_plinks_update(sdata);
783 	ieee80211_mbss_info_change_notify(sdata, changed);
784 
785 	mod_timer(&ifmsh->housekeeping_timer,
786 		  round_jiffies(jiffies +
787 				IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
788 }
789 
ieee80211_mesh_rootpath(struct ieee80211_sub_if_data * sdata)790 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
791 {
792 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
793 	u32 interval;
794 
795 	mesh_path_tx_root_frame(sdata);
796 
797 	if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
798 		interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
799 	else
800 		interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
801 
802 	mod_timer(&ifmsh->mesh_path_root_timer,
803 		  round_jiffies(TU_TO_EXP_TIME(interval)));
804 }
805 
806 static int
ieee80211_mesh_build_beacon(struct ieee80211_if_mesh * ifmsh)807 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
808 {
809 	struct beacon_data *bcn;
810 	int head_len, tail_len;
811 	struct sk_buff *skb;
812 	struct ieee80211_mgmt *mgmt;
813 	struct ieee80211_chanctx_conf *chanctx_conf;
814 	struct mesh_csa_settings *csa;
815 	enum nl80211_band band;
816 	u8 ie_len_he_cap;
817 	u8 *pos;
818 	struct ieee80211_sub_if_data *sdata;
819 	int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
820 
821 	sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
822 	rcu_read_lock();
823 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
824 	band = chanctx_conf->def.chan->band;
825 	rcu_read_unlock();
826 
827 	ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
828 						NL80211_IFTYPE_MESH_POINT);
829 	head_len = hdr_len +
830 		   2 + /* NULL SSID */
831 		   /* Channel Switch Announcement */
832 		   2 + sizeof(struct ieee80211_channel_sw_ie) +
833 		   /* Mesh Channel Switch Parameters */
834 		   2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
835 		   /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
836 		   2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
837 		   2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
838 		   2 + 8 + /* supported rates */
839 		   2 + 3; /* DS params */
840 	tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
841 		   2 + sizeof(struct ieee80211_ht_cap) +
842 		   2 + sizeof(struct ieee80211_ht_operation) +
843 		   2 + ifmsh->mesh_id_len +
844 		   2 + sizeof(struct ieee80211_meshconf_ie) +
845 		   2 + sizeof(__le16) + /* awake window */
846 		   2 + sizeof(struct ieee80211_vht_cap) +
847 		   2 + sizeof(struct ieee80211_vht_operation) +
848 		   ie_len_he_cap +
849 		   2 + 1 + sizeof(struct ieee80211_he_operation) +
850 			   sizeof(struct ieee80211_he_6ghz_oper) +
851 		   2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
852 		   ifmsh->ie_len;
853 
854 	bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
855 	/* need an skb for IE builders to operate on */
856 	skb = __dev_alloc_skb(max(head_len, tail_len), GFP_KERNEL);
857 
858 	if (!bcn || !skb)
859 		goto out_free;
860 
861 	/*
862 	 * pointers go into the block we allocated,
863 	 * memory is | beacon_data | head | tail |
864 	 */
865 	bcn->head = ((u8 *) bcn) + sizeof(*bcn);
866 
867 	/* fill in the head */
868 	mgmt = skb_put_zero(skb, hdr_len);
869 	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
870 					  IEEE80211_STYPE_BEACON);
871 	eth_broadcast_addr(mgmt->da);
872 	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
873 	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
874 	ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
875 	mgmt->u.beacon.beacon_int =
876 		cpu_to_le16(sdata->vif.bss_conf.beacon_int);
877 	mgmt->u.beacon.capab_info |= cpu_to_le16(
878 		sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
879 
880 	pos = skb_put(skb, 2);
881 	*pos++ = WLAN_EID_SSID;
882 	*pos++ = 0x0;
883 
884 	rcu_read_lock();
885 	csa = rcu_dereference(ifmsh->csa);
886 	if (csa) {
887 		enum nl80211_channel_type ct;
888 		struct cfg80211_chan_def *chandef;
889 		int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
890 			     2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
891 
892 		pos = skb_put_zero(skb, ie_len);
893 		*pos++ = WLAN_EID_CHANNEL_SWITCH;
894 		*pos++ = 3;
895 		*pos++ = 0x0;
896 		*pos++ = ieee80211_frequency_to_channel(
897 				csa->settings.chandef.chan->center_freq);
898 		bcn->cntdwn_current_counter = csa->settings.count;
899 		bcn->cntdwn_counter_offsets[0] = hdr_len + 6;
900 		*pos++ = csa->settings.count;
901 		*pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
902 		*pos++ = 6;
903 		if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
904 			*pos++ = ifmsh->mshcfg.dot11MeshTTL;
905 			*pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
906 		} else {
907 			*pos++ = ifmsh->chsw_ttl;
908 		}
909 		*pos++ |= csa->settings.block_tx ?
910 			  WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
911 		put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
912 		pos += 2;
913 		put_unaligned_le16(ifmsh->pre_value, pos);
914 		pos += 2;
915 
916 		switch (csa->settings.chandef.width) {
917 		case NL80211_CHAN_WIDTH_40:
918 			ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
919 			pos = skb_put_zero(skb, ie_len);
920 
921 			*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
922 			*pos++ = 1;				    /* len */
923 			ct = cfg80211_get_chandef_type(&csa->settings.chandef);
924 			if (ct == NL80211_CHAN_HT40PLUS)
925 				*pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
926 			else
927 				*pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
928 			break;
929 		case NL80211_CHAN_WIDTH_80:
930 		case NL80211_CHAN_WIDTH_80P80:
931 		case NL80211_CHAN_WIDTH_160:
932 			/* Channel Switch Wrapper + Wide Bandwidth CSA IE */
933 			ie_len = 2 + 2 +
934 				 sizeof(struct ieee80211_wide_bw_chansw_ie);
935 			pos = skb_put_zero(skb, ie_len);
936 
937 			*pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
938 			*pos++ = 5;				  /* len */
939 			/* put sub IE */
940 			chandef = &csa->settings.chandef;
941 			ieee80211_ie_build_wide_bw_cs(pos, chandef);
942 			break;
943 		default:
944 			break;
945 		}
946 	}
947 	rcu_read_unlock();
948 
949 	if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
950 	    mesh_add_ds_params_ie(sdata, skb))
951 		goto out_free;
952 
953 	bcn->head_len = skb->len;
954 	memcpy(bcn->head, skb->data, bcn->head_len);
955 
956 	/* now the tail */
957 	skb_trim(skb, 0);
958 	bcn->tail = bcn->head + bcn->head_len;
959 
960 	if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
961 	    mesh_add_rsn_ie(sdata, skb) ||
962 	    mesh_add_ht_cap_ie(sdata, skb) ||
963 	    mesh_add_ht_oper_ie(sdata, skb) ||
964 	    mesh_add_meshid_ie(sdata, skb) ||
965 	    mesh_add_meshconf_ie(sdata, skb) ||
966 	    mesh_add_awake_window_ie(sdata, skb) ||
967 	    mesh_add_vht_cap_ie(sdata, skb) ||
968 	    mesh_add_vht_oper_ie(sdata, skb) ||
969 	    mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
970 	    mesh_add_he_oper_ie(sdata, skb) ||
971 	    mesh_add_he_6ghz_cap_ie(sdata, skb) ||
972 	    mesh_add_vendor_ies(sdata, skb))
973 		goto out_free;
974 
975 	bcn->tail_len = skb->len;
976 	memcpy(bcn->tail, skb->data, bcn->tail_len);
977 	ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len);
978 	bcn->meshconf = (struct ieee80211_meshconf_ie *)
979 					(bcn->tail + ifmsh->meshconf_offset);
980 
981 	dev_kfree_skb(skb);
982 	rcu_assign_pointer(ifmsh->beacon, bcn);
983 	return 0;
984 out_free:
985 	kfree(bcn);
986 	dev_kfree_skb(skb);
987 	return -ENOMEM;
988 }
989 
990 static int
ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data * sdata)991 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
992 {
993 	struct beacon_data *old_bcn;
994 	int ret;
995 
996 	old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
997 					    lockdep_is_held(&sdata->wdev.mtx));
998 	ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
999 	if (ret)
1000 		/* just reuse old beacon */
1001 		return ret;
1002 
1003 	if (old_bcn)
1004 		kfree_rcu(old_bcn, rcu_head);
1005 	return 0;
1006 }
1007 
ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data * sdata,u32 changed)1008 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1009 				       u32 changed)
1010 {
1011 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1012 	unsigned long bits = changed;
1013 	u32 bit;
1014 
1015 	if (!bits)
1016 		return;
1017 
1018 	/* if we race with running work, worst case this work becomes a noop */
1019 	for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
1020 		set_bit(bit, &ifmsh->mbss_changed);
1021 	set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
1022 	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1023 }
1024 
ieee80211_start_mesh(struct ieee80211_sub_if_data * sdata)1025 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
1026 {
1027 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1028 	struct ieee80211_local *local = sdata->local;
1029 	u32 changed = BSS_CHANGED_BEACON |
1030 		      BSS_CHANGED_BEACON_ENABLED |
1031 		      BSS_CHANGED_HT |
1032 		      BSS_CHANGED_BASIC_RATES |
1033 		      BSS_CHANGED_BEACON_INT |
1034 		      BSS_CHANGED_MCAST_RATE;
1035 
1036 	local->fif_other_bss++;
1037 	/* mesh ifaces must set allmulti to forward mcast traffic */
1038 	atomic_inc(&local->iff_allmultis);
1039 	ieee80211_configure_filter(local);
1040 
1041 	ifmsh->mesh_cc_id = 0;	/* Disabled */
1042 	/* register sync ops from extensible synchronization framework */
1043 	ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1044 	ifmsh->sync_offset_clockdrift_max = 0;
1045 	set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1046 	ieee80211_mesh_root_setup(ifmsh);
1047 	ieee80211_queue_work(&local->hw, &sdata->work);
1048 	sdata->vif.bss_conf.ht_operation_mode =
1049 				ifmsh->mshcfg.ht_opmode;
1050 	sdata->vif.bss_conf.enable_beacon = true;
1051 
1052 	changed |= ieee80211_mps_local_status_update(sdata);
1053 
1054 	if (ieee80211_mesh_build_beacon(ifmsh)) {
1055 		ieee80211_stop_mesh(sdata);
1056 		return -ENOMEM;
1057 	}
1058 
1059 	ieee80211_recalc_dtim(local, sdata);
1060 	ieee80211_bss_info_change_notify(sdata, changed);
1061 
1062 	netif_carrier_on(sdata->dev);
1063 	return 0;
1064 }
1065 
ieee80211_stop_mesh(struct ieee80211_sub_if_data * sdata)1066 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1067 {
1068 	struct ieee80211_local *local = sdata->local;
1069 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1070 	struct beacon_data *bcn;
1071 
1072 	netif_carrier_off(sdata->dev);
1073 
1074 	/* flush STAs and mpaths on this iface */
1075 	sta_info_flush(sdata);
1076 	ieee80211_free_keys(sdata, true);
1077 	mesh_path_flush_by_iface(sdata);
1078 
1079 	/* stop the beacon */
1080 	ifmsh->mesh_id_len = 0;
1081 	sdata->vif.bss_conf.enable_beacon = false;
1082 	sdata->beacon_rate_set = false;
1083 	clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1084 	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
1085 
1086 	/* remove beacon */
1087 	bcn = rcu_dereference_protected(ifmsh->beacon,
1088 					lockdep_is_held(&sdata->wdev.mtx));
1089 	RCU_INIT_POINTER(ifmsh->beacon, NULL);
1090 	kfree_rcu(bcn, rcu_head);
1091 
1092 	/* free all potentially still buffered group-addressed frames */
1093 	local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1094 	skb_queue_purge(&ifmsh->ps.bc_buf);
1095 
1096 	del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1097 	del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1098 	del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1099 
1100 	/* clear any mesh work (for next join) we may have accrued */
1101 	ifmsh->wrkq_flags = 0;
1102 	ifmsh->mbss_changed = 0;
1103 
1104 	local->fif_other_bss--;
1105 	atomic_dec(&local->iff_allmultis);
1106 	ieee80211_configure_filter(local);
1107 }
1108 
ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data * sdata)1109 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1110 {
1111 	int err;
1112 
1113 	/* if the current channel is a DFS channel, mark the channel as
1114 	 * unavailable.
1115 	 */
1116 	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1117 					    &sdata->vif.bss_conf.chandef,
1118 					    NL80211_IFTYPE_MESH_POINT);
1119 	if (err > 0)
1120 		cfg80211_radar_event(sdata->local->hw.wiphy,
1121 				     &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1122 }
1123 
1124 static bool
ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data * sdata,struct ieee802_11_elems * elems,bool beacon)1125 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1126 				 struct ieee802_11_elems *elems, bool beacon)
1127 {
1128 	struct cfg80211_csa_settings params;
1129 	struct ieee80211_csa_ie csa_ie;
1130 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1131 	struct ieee80211_supported_band *sband;
1132 	int err;
1133 	u32 sta_flags, vht_cap_info = 0;
1134 
1135 	sdata_assert_lock(sdata);
1136 
1137 	sband = ieee80211_get_sband(sdata);
1138 	if (!sband)
1139 		return false;
1140 
1141 	sta_flags = 0;
1142 	switch (sdata->vif.bss_conf.chandef.width) {
1143 	case NL80211_CHAN_WIDTH_20_NOHT:
1144 		sta_flags |= IEEE80211_STA_DISABLE_HT;
1145 		fallthrough;
1146 	case NL80211_CHAN_WIDTH_20:
1147 		sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
1148 		fallthrough;
1149 	case NL80211_CHAN_WIDTH_40:
1150 		sta_flags |= IEEE80211_STA_DISABLE_VHT;
1151 		break;
1152 	default:
1153 		break;
1154 	}
1155 
1156 	if (elems->vht_cap_elem)
1157 		vht_cap_info =
1158 			le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1159 
1160 	memset(&params, 0, sizeof(params));
1161 	err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1162 					   vht_cap_info,
1163 					   sta_flags, sdata->vif.addr,
1164 					   &csa_ie);
1165 	if (err < 0)
1166 		return false;
1167 	if (err)
1168 		return false;
1169 
1170 	/* Mark the channel unavailable if the reason for the switch is
1171 	 * regulatory.
1172 	 */
1173 	if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1174 		ieee80211_mesh_csa_mark_radar(sdata);
1175 
1176 	params.chandef = csa_ie.chandef;
1177 	params.count = csa_ie.count;
1178 
1179 	if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1180 				     IEEE80211_CHAN_DISABLED) ||
1181 	    !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1182 				     NL80211_IFTYPE_MESH_POINT)) {
1183 		sdata_info(sdata,
1184 			   "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1185 			   sdata->vif.addr,
1186 			   params.chandef.chan->center_freq,
1187 			   params.chandef.width,
1188 			   params.chandef.center_freq1,
1189 			   params.chandef.center_freq2);
1190 		return false;
1191 	}
1192 
1193 	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1194 					    &params.chandef,
1195 					    NL80211_IFTYPE_MESH_POINT);
1196 	if (err < 0)
1197 		return false;
1198 	if (err > 0 && !ifmsh->userspace_handles_dfs) {
1199 		sdata_info(sdata,
1200 			   "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1201 			   sdata->vif.addr,
1202 			   params.chandef.chan->center_freq,
1203 			   params.chandef.width,
1204 			   params.chandef.center_freq1,
1205 			   params.chandef.center_freq2);
1206 		return false;
1207 	}
1208 
1209 	params.radar_required = err;
1210 
1211 	if (cfg80211_chandef_identical(&params.chandef,
1212 				       &sdata->vif.bss_conf.chandef)) {
1213 		mcsa_dbg(sdata,
1214 			 "received csa with an identical chandef, ignoring\n");
1215 		return true;
1216 	}
1217 
1218 	mcsa_dbg(sdata,
1219 		 "received channel switch announcement to go to channel %d MHz\n",
1220 		 params.chandef.chan->center_freq);
1221 
1222 	params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1223 	if (beacon) {
1224 		ifmsh->chsw_ttl = csa_ie.ttl - 1;
1225 		if (ifmsh->pre_value >= csa_ie.pre_value)
1226 			return false;
1227 		ifmsh->pre_value = csa_ie.pre_value;
1228 	}
1229 
1230 	if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1231 		return false;
1232 
1233 	ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1234 
1235 	if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1236 				     &params) < 0)
1237 		return false;
1238 
1239 	return true;
1240 }
1241 
1242 static void
ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1243 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1244 			    struct ieee80211_mgmt *mgmt, size_t len)
1245 {
1246 	struct ieee80211_local *local = sdata->local;
1247 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1248 	struct sk_buff *presp;
1249 	struct beacon_data *bcn;
1250 	struct ieee80211_mgmt *hdr;
1251 	struct ieee802_11_elems *elems;
1252 	size_t baselen;
1253 	u8 *pos;
1254 
1255 	pos = mgmt->u.probe_req.variable;
1256 	baselen = (u8 *) pos - (u8 *) mgmt;
1257 	if (baselen > len)
1258 		return;
1259 
1260 	elems = ieee802_11_parse_elems(pos, len - baselen, false, mgmt->bssid,
1261 				       NULL);
1262 	if (!elems)
1263 		return;
1264 
1265 	if (!elems->mesh_id)
1266 		goto free;
1267 
1268 	/* 802.11-2012 10.1.4.3.2 */
1269 	if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1270 	     !is_broadcast_ether_addr(mgmt->da)) ||
1271 	    elems->ssid_len != 0)
1272 		goto free;
1273 
1274 	if (elems->mesh_id_len != 0 &&
1275 	    (elems->mesh_id_len != ifmsh->mesh_id_len ||
1276 	     memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1277 		goto free;
1278 
1279 	rcu_read_lock();
1280 	bcn = rcu_dereference(ifmsh->beacon);
1281 
1282 	if (!bcn)
1283 		goto out;
1284 
1285 	presp = dev_alloc_skb(local->tx_headroom +
1286 			      bcn->head_len + bcn->tail_len);
1287 	if (!presp)
1288 		goto out;
1289 
1290 	skb_reserve(presp, local->tx_headroom);
1291 	skb_put_data(presp, bcn->head, bcn->head_len);
1292 	skb_put_data(presp, bcn->tail, bcn->tail_len);
1293 	hdr = (struct ieee80211_mgmt *) presp->data;
1294 	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1295 					 IEEE80211_STYPE_PROBE_RESP);
1296 	memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1297 	IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1298 	ieee80211_tx_skb(sdata, presp);
1299 out:
1300 	rcu_read_unlock();
1301 free:
1302 	kfree(elems);
1303 }
1304 
ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data * sdata,u16 stype,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1305 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1306 					u16 stype,
1307 					struct ieee80211_mgmt *mgmt,
1308 					size_t len,
1309 					struct ieee80211_rx_status *rx_status)
1310 {
1311 	struct ieee80211_local *local = sdata->local;
1312 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1313 	struct ieee802_11_elems *elems;
1314 	struct ieee80211_channel *channel;
1315 	size_t baselen;
1316 	int freq;
1317 	enum nl80211_band band = rx_status->band;
1318 
1319 	/* ignore ProbeResp to foreign address */
1320 	if (stype == IEEE80211_STYPE_PROBE_RESP &&
1321 	    !ether_addr_equal(mgmt->da, sdata->vif.addr))
1322 		return;
1323 
1324 	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1325 	if (baselen > len)
1326 		return;
1327 
1328 	elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1329 				       len - baselen,
1330 				       false, mgmt->bssid, NULL);
1331 	if (!elems)
1332 		return;
1333 
1334 	/* ignore non-mesh or secure / unsecure mismatch */
1335 	if ((!elems->mesh_id || !elems->mesh_config) ||
1336 	    (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1337 	    (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1338 		goto free;
1339 
1340 	if (elems->ds_params)
1341 		freq = ieee80211_channel_to_frequency(elems->ds_params[0], band);
1342 	else
1343 		freq = rx_status->freq;
1344 
1345 	channel = ieee80211_get_channel(local->hw.wiphy, freq);
1346 
1347 	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1348 		goto free;
1349 
1350 	if (mesh_matches_local(sdata, elems)) {
1351 		mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1352 			sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1353 		if (!sdata->u.mesh.user_mpm ||
1354 		    sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1355 		    sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1356 			mesh_neighbour_update(sdata, mgmt->sa, elems,
1357 					      rx_status);
1358 
1359 		if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1360 		    !sdata->vif.bss_conf.csa_active)
1361 			ieee80211_mesh_process_chnswitch(sdata, elems, true);
1362 	}
1363 
1364 	if (ifmsh->sync_ops)
1365 		ifmsh->sync_ops->rx_bcn_presp(sdata, stype, mgmt, len,
1366 					      elems->mesh_config, rx_status);
1367 free:
1368 	kfree(elems);
1369 }
1370 
ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data * sdata)1371 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1372 {
1373 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1374 	struct mesh_csa_settings *tmp_csa_settings;
1375 	int ret = 0;
1376 	int changed = 0;
1377 
1378 	/* Reset the TTL value and Initiator flag */
1379 	ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1380 	ifmsh->chsw_ttl = 0;
1381 
1382 	/* Remove the CSA and MCSP elements from the beacon */
1383 	tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
1384 					    lockdep_is_held(&sdata->wdev.mtx));
1385 	RCU_INIT_POINTER(ifmsh->csa, NULL);
1386 	if (tmp_csa_settings)
1387 		kfree_rcu(tmp_csa_settings, rcu_head);
1388 	ret = ieee80211_mesh_rebuild_beacon(sdata);
1389 	if (ret)
1390 		return -EINVAL;
1391 
1392 	changed |= BSS_CHANGED_BEACON;
1393 
1394 	mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1395 		 sdata->vif.bss_conf.chandef.chan->center_freq);
1396 	return changed;
1397 }
1398 
ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data * sdata,struct cfg80211_csa_settings * csa_settings)1399 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1400 			      struct cfg80211_csa_settings *csa_settings)
1401 {
1402 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1403 	struct mesh_csa_settings *tmp_csa_settings;
1404 	int ret = 0;
1405 
1406 	lockdep_assert_held(&sdata->wdev.mtx);
1407 
1408 	tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1409 				   GFP_ATOMIC);
1410 	if (!tmp_csa_settings)
1411 		return -ENOMEM;
1412 
1413 	memcpy(&tmp_csa_settings->settings, csa_settings,
1414 	       sizeof(struct cfg80211_csa_settings));
1415 
1416 	rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1417 
1418 	ret = ieee80211_mesh_rebuild_beacon(sdata);
1419 	if (ret) {
1420 		tmp_csa_settings = rcu_dereference(ifmsh->csa);
1421 		RCU_INIT_POINTER(ifmsh->csa, NULL);
1422 		kfree_rcu(tmp_csa_settings, rcu_head);
1423 		return ret;
1424 	}
1425 
1426 	return BSS_CHANGED_BEACON;
1427 }
1428 
mesh_fwd_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee802_11_elems * elems)1429 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1430 			       struct ieee80211_mgmt *mgmt, size_t len,
1431 			       struct ieee802_11_elems *elems)
1432 {
1433 	struct ieee80211_mgmt *mgmt_fwd;
1434 	struct sk_buff *skb;
1435 	struct ieee80211_local *local = sdata->local;
1436 
1437 	skb = dev_alloc_skb(local->tx_headroom + len);
1438 	if (!skb)
1439 		return -ENOMEM;
1440 	skb_reserve(skb, local->tx_headroom);
1441 	mgmt_fwd = skb_put(skb, len);
1442 
1443 	elems->mesh_chansw_params_ie->mesh_ttl--;
1444 	elems->mesh_chansw_params_ie->mesh_flags &=
1445 		~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1446 
1447 	memcpy(mgmt_fwd, mgmt, len);
1448 	eth_broadcast_addr(mgmt_fwd->da);
1449 	memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1450 	memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1451 
1452 	ieee80211_tx_skb(sdata, skb);
1453 	return 0;
1454 }
1455 
mesh_rx_csa_frame(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len)1456 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1457 			      struct ieee80211_mgmt *mgmt, size_t len)
1458 {
1459 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1460 	struct ieee802_11_elems *elems;
1461 	u16 pre_value;
1462 	bool fwd_csa = true;
1463 	size_t baselen;
1464 	u8 *pos;
1465 
1466 	if (mgmt->u.action.u.measurement.action_code !=
1467 	    WLAN_ACTION_SPCT_CHL_SWITCH)
1468 		return;
1469 
1470 	pos = mgmt->u.action.u.chan_switch.variable;
1471 	baselen = offsetof(struct ieee80211_mgmt,
1472 			   u.action.u.chan_switch.variable);
1473 	elems = ieee802_11_parse_elems(pos, len - baselen, true,
1474 				       mgmt->bssid, NULL);
1475 	if (!elems)
1476 		return;
1477 
1478 	if (!mesh_matches_local(sdata, elems))
1479 		goto free;
1480 
1481 	ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl;
1482 	if (!--ifmsh->chsw_ttl)
1483 		fwd_csa = false;
1484 
1485 	pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value);
1486 	if (ifmsh->pre_value >= pre_value)
1487 		goto free;
1488 
1489 	ifmsh->pre_value = pre_value;
1490 
1491 	if (!sdata->vif.bss_conf.csa_active &&
1492 	    !ieee80211_mesh_process_chnswitch(sdata, elems, false)) {
1493 		mcsa_dbg(sdata, "Failed to process CSA action frame");
1494 		goto free;
1495 	}
1496 
1497 	/* forward or re-broadcast the CSA frame */
1498 	if (fwd_csa) {
1499 		if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0)
1500 			mcsa_dbg(sdata, "Failed to forward the CSA frame");
1501 	}
1502 free:
1503 	kfree(elems);
1504 }
1505 
ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)1506 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1507 					  struct ieee80211_mgmt *mgmt,
1508 					  size_t len,
1509 					  struct ieee80211_rx_status *rx_status)
1510 {
1511 	switch (mgmt->u.action.category) {
1512 	case WLAN_CATEGORY_SELF_PROTECTED:
1513 		switch (mgmt->u.action.u.self_prot.action_code) {
1514 		case WLAN_SP_MESH_PEERING_OPEN:
1515 		case WLAN_SP_MESH_PEERING_CLOSE:
1516 		case WLAN_SP_MESH_PEERING_CONFIRM:
1517 			mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1518 			break;
1519 		}
1520 		break;
1521 	case WLAN_CATEGORY_MESH_ACTION:
1522 		if (mesh_action_is_path_sel(mgmt))
1523 			mesh_rx_path_sel_frame(sdata, mgmt, len);
1524 		break;
1525 	case WLAN_CATEGORY_SPECTRUM_MGMT:
1526 		mesh_rx_csa_frame(sdata, mgmt, len);
1527 		break;
1528 	}
1529 }
1530 
ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1531 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1532 				   struct sk_buff *skb)
1533 {
1534 	struct ieee80211_rx_status *rx_status;
1535 	struct ieee80211_mgmt *mgmt;
1536 	u16 stype;
1537 
1538 	sdata_lock(sdata);
1539 
1540 	/* mesh already went down */
1541 	if (!sdata->u.mesh.mesh_id_len)
1542 		goto out;
1543 
1544 	rx_status = IEEE80211_SKB_RXCB(skb);
1545 	mgmt = (struct ieee80211_mgmt *) skb->data;
1546 	stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1547 
1548 	switch (stype) {
1549 	case IEEE80211_STYPE_PROBE_RESP:
1550 	case IEEE80211_STYPE_BEACON:
1551 		ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1552 					    rx_status);
1553 		break;
1554 	case IEEE80211_STYPE_PROBE_REQ:
1555 		ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1556 		break;
1557 	case IEEE80211_STYPE_ACTION:
1558 		ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1559 		break;
1560 	}
1561 out:
1562 	sdata_unlock(sdata);
1563 }
1564 
mesh_bss_info_changed(struct ieee80211_sub_if_data * sdata)1565 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1566 {
1567 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1568 	u32 bit, changed = 0;
1569 
1570 	for_each_set_bit(bit, &ifmsh->mbss_changed,
1571 			 sizeof(changed) * BITS_PER_BYTE) {
1572 		clear_bit(bit, &ifmsh->mbss_changed);
1573 		changed |= BIT(bit);
1574 	}
1575 
1576 	if (sdata->vif.bss_conf.enable_beacon &&
1577 	    (changed & (BSS_CHANGED_BEACON |
1578 			BSS_CHANGED_HT |
1579 			BSS_CHANGED_BASIC_RATES |
1580 			BSS_CHANGED_BEACON_INT)))
1581 		if (ieee80211_mesh_rebuild_beacon(sdata))
1582 			return;
1583 
1584 	ieee80211_bss_info_change_notify(sdata, changed);
1585 }
1586 
ieee80211_mesh_work(struct ieee80211_sub_if_data * sdata)1587 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1588 {
1589 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1590 
1591 	sdata_lock(sdata);
1592 
1593 	/* mesh already went down */
1594 	if (!sdata->u.mesh.mesh_id_len)
1595 		goto out;
1596 
1597 	if (ifmsh->preq_queue_len &&
1598 	    time_after(jiffies,
1599 		       ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1600 		mesh_path_start_discovery(sdata);
1601 
1602 	if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1603 		ieee80211_mesh_housekeeping(sdata);
1604 
1605 	if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1606 		ieee80211_mesh_rootpath(sdata);
1607 
1608 	if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1609 		mesh_sync_adjust_tsf(sdata);
1610 
1611 	if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1612 		mesh_bss_info_changed(sdata);
1613 out:
1614 	sdata_unlock(sdata);
1615 }
1616 
1617 
ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data * sdata)1618 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1619 {
1620 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1621 	static u8 zero_addr[ETH_ALEN] = {};
1622 
1623 	timer_setup(&ifmsh->housekeeping_timer,
1624 		    ieee80211_mesh_housekeeping_timer, 0);
1625 
1626 	ifmsh->accepting_plinks = true;
1627 	atomic_set(&ifmsh->mpaths, 0);
1628 	mesh_rmc_init(sdata);
1629 	ifmsh->last_preq = jiffies;
1630 	ifmsh->next_perr = jiffies;
1631 	ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1632 	/* Allocate all mesh structures when creating the first mesh interface. */
1633 	if (!mesh_allocated)
1634 		ieee80211s_init();
1635 
1636 	mesh_pathtbl_init(sdata);
1637 
1638 	timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1639 	timer_setup(&ifmsh->mesh_path_root_timer,
1640 		    ieee80211_mesh_path_root_timer, 0);
1641 	INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1642 	skb_queue_head_init(&ifmsh->ps.bc_buf);
1643 	spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1644 	spin_lock_init(&ifmsh->sync_offset_lock);
1645 	RCU_INIT_POINTER(ifmsh->beacon, NULL);
1646 
1647 	sdata->vif.bss_conf.bssid = zero_addr;
1648 }
1649 
ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data * sdata)1650 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1651 {
1652 	mesh_rmc_free(sdata);
1653 	mesh_pathtbl_unregister(sdata);
1654 }
1655