mesh.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (c) 2008, 2009 open80211s Ltd.
   4 * Copyright (C) 2018 - 2025 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 <net/sock.h>
  12#include "ieee80211_i.h"
  13#include "mesh.h"
  14#include "wme.h"
  15#include "driver-ops.h"
  16
  17static int mesh_allocated;
  18static struct kmem_cache *rm_cache;
  19
  20bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  21{
  22	return (mgmt->u.action.u.mesh_action.action_code ==
  23			WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  24}
  25
  26void ieee80211s_init(void)
  27{
  28	mesh_allocated = 1;
  29	rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  30				     0, 0, NULL);
  31}
  32
  33void ieee80211s_stop(void)
  34{
  35	if (!mesh_allocated)
  36		return;
  37	kmem_cache_destroy(rm_cache);
  38}
  39
  40static void ieee80211_mesh_housekeeping_timer(struct timer_list *t)
  41{
  42	struct ieee80211_sub_if_data *sdata =
  43		timer_container_of(sdata, t, u.mesh.housekeeping_timer);
  44	struct ieee80211_local *local = sdata->local;
  45	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  46
  47	set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  48
  49	wiphy_work_queue(local->hw.wiphy, &sdata->work);
  50}
  51
  52/**
  53 * mesh_matches_local - check if the config of a mesh point matches ours
  54 *
  55 * @sdata: local mesh subif
  56 * @ie: information elements of a management frame from the mesh peer
  57 *
  58 * This function checks if the mesh configuration of a mesh point matches the
  59 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  60 *
  61 * Returns: %true if both nodes belong to the same mesh
  62 */
  63bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  64			struct ieee802_11_elems *ie)
  65{
  66	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  67	u32 basic_rates = 0;
  68	struct cfg80211_chan_def sta_chan_def;
  69	struct ieee80211_supported_band *sband;
  70	u32 vht_cap_info = 0;
  71
  72	/*
  73	 * As support for each feature is added, check for matching
  74	 * - On mesh config capabilities
  75	 *   - Power Save Support En
  76	 *   - Sync support enabled
  77	 *   - Sync support active
  78	 *   - Sync support required from peer
  79	 *   - MDA enabled
  80	 * - Power management control on fc
  81	 */
  82	if (!ie->mesh_config)
  83		return false;
  84
  85	if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  86	     memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  87	     (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  88	     (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  89	     (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  90	     (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  91	     (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  92		return false;
  93
  94	sband = ieee80211_get_sband(sdata);
  95	if (!sband)
  96		return false;
  97
  98	ieee80211_sta_get_rates(sdata, ie, sband->band,
  99				&basic_rates);
 100
 101	if (sdata->vif.bss_conf.basic_rates != basic_rates)
 102		return false;
 103
 104	cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chanreq.oper.chan,
 105				NL80211_CHAN_NO_HT);
 106	ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
 107
 108	if (ie->vht_cap_elem)
 109		vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info);
 110
 111	ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
 112				   ie->vht_operation, ie->ht_operation,
 113				   &sta_chan_def);
 114	ieee80211_chandef_he_6ghz_oper(sdata->local, ie->he_operation,
 115				       ie->eht_operation,
 116				       &sta_chan_def);
 117
 118	if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chanreq.oper,
 119					 &sta_chan_def))
 120		return false;
 121
 122	return true;
 123}
 124
 125/**
 126 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 127 *
 128 * @ie: information elements of a management frame from the mesh peer
 129 *
 130 * Returns: %true if the mesh peer is willing to establish peer links
 131 */
 132bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 133{
 134	return (ie->mesh_config->meshconf_cap &
 135			IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 136}
 137
 138/**
 139 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 140 *
 141 * @sdata: mesh interface in which mesh beacons are going to be updated
 142 *
 143 * Returns: beacon changed flag if the beacon content changed.
 144 */
 145u64 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 146{
 147	bool free_plinks;
 148	u64 changed = 0;
 149
 150	/* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 151	 * the mesh interface might be able to establish plinks with peers that
 152	 * are already on the table but are not on PLINK_ESTAB state. However,
 153	 * in general the mesh interface is not accepting peer link requests
 154	 * from new peers, and that must be reflected in the beacon
 155	 */
 156	free_plinks = mesh_plink_availables(sdata);
 157
 158	if (free_plinks != sdata->u.mesh.accepting_plinks) {
 159		sdata->u.mesh.accepting_plinks = free_plinks;
 160		changed = BSS_CHANGED_BEACON;
 161	}
 162
 163	return changed;
 164}
 165
 166/*
 167 * mesh_sta_cleanup - clean up any mesh sta state
 168 *
 169 * @sta: mesh sta to clean up.
 170 */
 171void mesh_sta_cleanup(struct sta_info *sta)
 172{
 173	struct ieee80211_sub_if_data *sdata = sta->sdata;
 174	u64 changed = mesh_plink_deactivate(sta);
 175
 176	if (changed)
 177		ieee80211_mbss_info_change_notify(sdata, changed);
 178}
 179
 180int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 181{
 182	int i;
 183
 184	sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 185	if (!sdata->u.mesh.rmc)
 186		return -ENOMEM;
 187	sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 188	for (i = 0; i < RMC_BUCKETS; i++)
 189		INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 190	return 0;
 191}
 192
 193void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 194{
 195	struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 196	struct rmc_entry *p;
 197	struct hlist_node *n;
 198	int i;
 199
 200	if (!sdata->u.mesh.rmc)
 201		return;
 202
 203	for (i = 0; i < RMC_BUCKETS; i++) {
 204		hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 205			hlist_del(&p->list);
 206			kmem_cache_free(rm_cache, p);
 207		}
 208	}
 209
 210	kfree(rmc);
 211	sdata->u.mesh.rmc = NULL;
 212}
 213
 214/**
 215 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 216 *
 217 * @sdata:	interface
 218 * @sa:		source address
 219 * @mesh_hdr:	mesh_header
 220 *
 221 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 222 *
 223 * Checks using the source address and the mesh sequence number if we have
 224 * received this frame lately. If the frame is not in the cache, it is added to
 225 * it.
 226 */
 227int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 228		   const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 229{
 230	struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 231	u32 seqnum = 0;
 232	int entries = 0;
 233	u8 idx;
 234	struct rmc_entry *p;
 235	struct hlist_node *n;
 236
 237	if (!rmc)
 238		return -1;
 239
 240	/* Don't care about endianness since only match matters */
 241	memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 242	idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 243	hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 244		++entries;
 245		if (time_after(jiffies, p->exp_time) ||
 246		    entries == RMC_QUEUE_MAX_LEN) {
 247			hlist_del(&p->list);
 248			kmem_cache_free(rm_cache, p);
 249			--entries;
 250		} else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 251			return -1;
 252	}
 253
 254	p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 255	if (!p)
 256		return 0;
 257
 258	p->seqnum = seqnum;
 259	p->exp_time = jiffies + RMC_TIMEOUT;
 260	memcpy(p->sa, sa, ETH_ALEN);
 261	hlist_add_head(&p->list, &rmc->bucket[idx]);
 262	return 0;
 263}
 264
 265int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 266			 struct sk_buff *skb)
 267{
 268	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 269	u8 *pos, neighbors;
 270	u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 271	bool is_connected_to_gate = ifmsh->num_gates > 0 ||
 272		ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
 273		ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
 274	bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
 275
 276	if (skb_tailroom(skb) < 2 + meshconf_len)
 277		return -ENOMEM;
 278
 279	pos = skb_put(skb, 2 + meshconf_len);
 280	*pos++ = WLAN_EID_MESH_CONFIG;
 281	*pos++ = meshconf_len;
 282
 283	/* save a pointer for quick updates in pre-tbtt */
 284	ifmsh->meshconf_offset = pos - skb->data;
 285
 286	/* Active path selection protocol ID */
 287	*pos++ = ifmsh->mesh_pp_id;
 288	/* Active path selection metric ID   */
 289	*pos++ = ifmsh->mesh_pm_id;
 290	/* Congestion control mode identifier */
 291	*pos++ = ifmsh->mesh_cc_id;
 292	/* Synchronization protocol identifier */
 293	*pos++ = ifmsh->mesh_sp_id;
 294	/* Authentication Protocol identifier */
 295	*pos++ = ifmsh->mesh_auth_id;
 296	/* Mesh Formation Info - number of neighbors */
 297	neighbors = atomic_read(&ifmsh->estab_plinks);
 298	neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 299	*pos++ = (is_connected_to_as << 7) |
 300		 (neighbors << 1) |
 301		 is_connected_to_gate;
 302	/* Mesh capability */
 303	*pos = 0x00;
 304	*pos |= ifmsh->mshcfg.dot11MeshForwarding ?
 305			IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
 306	*pos |= ifmsh->accepting_plinks ?
 307			IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 308	/* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 309	*pos |= ifmsh->ps_peers_deep_sleep ?
 310			IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 311	return 0;
 312}
 313
 314int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 315{
 316	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 317	u8 *pos;
 318
 319	if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 320		return -ENOMEM;
 321
 322	pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 323	*pos++ = WLAN_EID_MESH_ID;
 324	*pos++ = ifmsh->mesh_id_len;
 325	if (ifmsh->mesh_id_len)
 326		memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 327
 328	return 0;
 329}
 330
 331static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 332				    struct sk_buff *skb)
 333{
 334	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 335	u8 *pos;
 336
 337	/* see IEEE802.11-2012 13.14.6 */
 338	if (ifmsh->ps_peers_light_sleep == 0 &&
 339	    ifmsh->ps_peers_deep_sleep == 0 &&
 340	    ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 341		return 0;
 342
 343	if (skb_tailroom(skb) < 4)
 344		return -ENOMEM;
 345
 346	pos = skb_put(skb, 2 + 2);
 347	*pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 348	*pos++ = 2;
 349	put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 350
 351	return 0;
 352}
 353
 354int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 355			struct sk_buff *skb)
 356{
 357	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 358	u8 offset, len;
 359	const u8 *data;
 360
 361	if (!ifmsh->ie || !ifmsh->ie_len)
 362		return 0;
 363
 364	/* fast-forward to vendor IEs */
 365	offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 366
 367	if (offset < ifmsh->ie_len) {
 368		len = ifmsh->ie_len - offset;
 369		data = ifmsh->ie + offset;
 370		if (skb_tailroom(skb) < len)
 371			return -ENOMEM;
 372		skb_put_data(skb, data, len);
 373	}
 374
 375	return 0;
 376}
 377
 378int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 379{
 380	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 381	u8 len = 0;
 382	const u8 *data;
 383
 384	if (!ifmsh->ie || !ifmsh->ie_len)
 385		return 0;
 386
 387	/* find RSN IE */
 388	data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
 389	if (!data)
 390		return 0;
 391
 392	len = data[1] + 2;
 393
 394	if (skb_tailroom(skb) < len)
 395		return -ENOMEM;
 396	skb_put_data(skb, data, len);
 397
 398	return 0;
 399}
 400
 401static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 402				 struct sk_buff *skb)
 403{
 404	struct ieee80211_chanctx_conf *chanctx_conf;
 405	struct ieee80211_channel *chan;
 406	u8 *pos;
 407
 408	if (skb_tailroom(skb) < 3)
 409		return -ENOMEM;
 410
 411	rcu_read_lock();
 412	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 413	if (WARN_ON(!chanctx_conf)) {
 414		rcu_read_unlock();
 415		return -EINVAL;
 416	}
 417	chan = chanctx_conf->def.chan;
 418	rcu_read_unlock();
 419
 420	pos = skb_put(skb, 2 + 1);
 421	*pos++ = WLAN_EID_DS_PARAMS;
 422	*pos++ = 1;
 423	*pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 424
 425	return 0;
 426}
 427
 428int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 429		       struct sk_buff *skb)
 430{
 431	struct ieee80211_supported_band *sband;
 432	u8 *pos;
 433
 434	sband = ieee80211_get_sband(sdata);
 435	if (!sband)
 436		return -EINVAL;
 437
 438	/* HT not allowed in 6 GHz */
 439	if (sband->band == NL80211_BAND_6GHZ)
 440		return 0;
 441
 442	if (!sband->ht_cap.ht_supported ||
 443	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 444	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 445	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
 446		return 0;
 447
 448	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 449		return -ENOMEM;
 450
 451	pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 452	ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 453
 454	return 0;
 455}
 456
 457int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 458			struct sk_buff *skb)
 459{
 460	struct ieee80211_local *local = sdata->local;
 461	struct ieee80211_chanctx_conf *chanctx_conf;
 462	struct ieee80211_channel *channel;
 463	struct ieee80211_supported_band *sband;
 464	struct ieee80211_sta_ht_cap *ht_cap;
 465	u8 *pos;
 466
 467	rcu_read_lock();
 468	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 469	if (WARN_ON(!chanctx_conf)) {
 470		rcu_read_unlock();
 471		return -EINVAL;
 472	}
 473	channel = chanctx_conf->def.chan;
 474	rcu_read_unlock();
 475
 476	sband = local->hw.wiphy->bands[channel->band];
 477	ht_cap = &sband->ht_cap;
 478
 479	/* HT not allowed in 6 GHz */
 480	if (sband->band == NL80211_BAND_6GHZ)
 481		return 0;
 482
 483	if (!ht_cap->ht_supported ||
 484	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 485	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 486	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
 487		return 0;
 488
 489	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 490		return -ENOMEM;
 491
 492	pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 493	ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chanreq.oper,
 494				   sdata->vif.bss_conf.ht_operation_mode,
 495				   false);
 496
 497	return 0;
 498}
 499
 500int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
 501			struct sk_buff *skb)
 502{
 503	struct ieee80211_supported_band *sband;
 504	u8 *pos;
 505
 506	sband = ieee80211_get_sband(sdata);
 507	if (!sband)
 508		return -EINVAL;
 509
 510	/* VHT not allowed in 6 GHz */
 511	if (sband->band == NL80211_BAND_6GHZ)
 512		return 0;
 513
 514	if (!sband->vht_cap.vht_supported ||
 515	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 516	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 517	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
 518		return 0;
 519
 520	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
 521		return -ENOMEM;
 522
 523	pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
 524	ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 525
 526	return 0;
 527}
 528
 529int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
 530			 struct sk_buff *skb)
 531{
 532	struct ieee80211_local *local = sdata->local;
 533	struct ieee80211_chanctx_conf *chanctx_conf;
 534	struct ieee80211_channel *channel;
 535	struct ieee80211_supported_band *sband;
 536	struct ieee80211_sta_vht_cap *vht_cap;
 537	u8 *pos;
 538
 539	rcu_read_lock();
 540	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 541	if (WARN_ON(!chanctx_conf)) {
 542		rcu_read_unlock();
 543		return -EINVAL;
 544	}
 545	channel = chanctx_conf->def.chan;
 546	rcu_read_unlock();
 547
 548	sband = local->hw.wiphy->bands[channel->band];
 549	vht_cap = &sband->vht_cap;
 550
 551	/* VHT not allowed in 6 GHz */
 552	if (sband->band == NL80211_BAND_6GHZ)
 553		return 0;
 554
 555	if (!vht_cap->vht_supported ||
 556	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 557	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 558	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
 559		return 0;
 560
 561	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
 562		return -ENOMEM;
 563
 564	pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 565	ieee80211_ie_build_vht_oper(pos, vht_cap,
 566				    &sdata->vif.bss_conf.chanreq.oper);
 567
 568	return 0;
 569}
 570
 571int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
 572		       struct sk_buff *skb, u8 ie_len)
 573{
 574	struct ieee80211_supported_band *sband;
 575
 576	sband = ieee80211_get_sband(sdata);
 577	if (!sband)
 578		return -EINVAL;
 579
 580	if (sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 581	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 582	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
 583		return 0;
 584
 585	return ieee80211_put_he_cap(skb, sdata, sband, NULL);
 586}
 587
 588int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
 589			struct sk_buff *skb)
 590{
 591	const struct ieee80211_sta_he_cap *he_cap;
 592	struct ieee80211_supported_band *sband;
 593	u32 len;
 594	u8 *pos;
 595
 596	sband = ieee80211_get_sband(sdata);
 597	if (!sband)
 598		return -EINVAL;
 599
 600	he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 601	if (!he_cap ||
 602	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 603	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 604	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
 605		return 0;
 606
 607	len = 2 + 1 + sizeof(struct ieee80211_he_operation);
 608	if (sdata->vif.bss_conf.chanreq.oper.chan->band == NL80211_BAND_6GHZ)
 609		len += sizeof(struct ieee80211_he_6ghz_oper);
 610
 611	if (skb_tailroom(skb) < len)
 612		return -ENOMEM;
 613
 614	pos = skb_put(skb, len);
 615	ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chanreq.oper);
 616
 617	return 0;
 618}
 619
 620int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
 621			    struct sk_buff *skb)
 622{
 623	struct ieee80211_supported_band *sband;
 624	const struct ieee80211_sband_iftype_data *iftd;
 625
 626	sband = ieee80211_get_sband(sdata);
 627	if (!sband)
 628		return -EINVAL;
 629
 630	if (sband->band != NL80211_BAND_6GHZ)
 631		return 0;
 632
 633	iftd = ieee80211_get_sband_iftype_data(sband,
 634					       NL80211_IFTYPE_MESH_POINT);
 635	/* The device doesn't support HE in mesh mode or at all */
 636	if (!iftd)
 637		return 0;
 638
 639	ieee80211_put_he_6ghz_cap(skb, sdata, sdata->deflink.smps_mode);
 640	return 0;
 641}
 642
 643int mesh_add_eht_cap_ie(struct ieee80211_sub_if_data *sdata,
 644			struct sk_buff *skb, u8 ie_len)
 645{
 646	struct ieee80211_supported_band *sband;
 647
 648	sband = ieee80211_get_sband(sdata);
 649	if (!sband)
 650		return -EINVAL;
 651
 652	if (sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 653	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 654	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
 655		return 0;
 656
 657	return ieee80211_put_eht_cap(skb, sdata, sband, NULL);
 658}
 659
 660int mesh_add_eht_oper_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 661{
 662	const struct ieee80211_sta_eht_cap *eht_cap;
 663	struct ieee80211_supported_band *sband;
 664	u32 len;
 665	u8 *pos;
 666
 667	sband = ieee80211_get_sband(sdata);
 668	if (!sband)
 669		return -EINVAL;
 670
 671	eht_cap = ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 672	if (!eht_cap ||
 673	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 674	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 675	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
 676		return 0;
 677
 678	len = 2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
 679		      offsetof(struct ieee80211_eht_operation_info, optional);
 680
 681	if (skb_tailroom(skb) < len)
 682		return -ENOMEM;
 683
 684	pos = skb_put(skb, len);
 685	ieee80211_ie_build_eht_oper(pos, &sdata->vif.bss_conf.chanreq.oper, eht_cap);
 686
 687	return 0;
 688}
 689
 690static void ieee80211_mesh_path_timer(struct timer_list *t)
 691{
 692	struct ieee80211_sub_if_data *sdata =
 693		timer_container_of(sdata, t, u.mesh.mesh_path_timer);
 694
 695	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 696}
 697
 698static void ieee80211_mesh_path_root_timer(struct timer_list *t)
 699{
 700	struct ieee80211_sub_if_data *sdata =
 701		timer_container_of(sdata, t, u.mesh.mesh_path_root_timer);
 702	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 703
 704	set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 705
 706	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 707}
 708
 709void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 710{
 711	if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 712		set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 713	else {
 714		clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 715		/* stop running timer */
 716		timer_delete_sync(&ifmsh->mesh_path_root_timer);
 717	}
 718}
 719
 720static void
 721ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
 722				 u8 *ie, u8 ie_len)
 723{
 724	struct ieee80211_supported_band *sband;
 725	const struct element *cap;
 726	const struct ieee80211_he_operation *he_oper = NULL;
 727
 728	sband = ieee80211_get_sband(sdata);
 729	if (!sband)
 730		return;
 731
 732	if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) ||
 733	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
 734	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_5 ||
 735	    sdata->vif.bss_conf.chanreq.oper.width == NL80211_CHAN_WIDTH_10)
 736		return;
 737
 738	sdata->vif.bss_conf.he_support = true;
 739
 740	cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
 741	if (cap && cap->datalen >= 1 + sizeof(*he_oper) &&
 742	    cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1))
 743		he_oper = (void *)(cap->data + 1);
 744
 745	if (he_oper)
 746		sdata->vif.bss_conf.he_oper.params =
 747			__le32_to_cpu(he_oper->he_oper_params);
 748
 749	sdata->vif.bss_conf.eht_support =
 750		!!ieee80211_get_eht_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 751}
 752
 753bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
 754			      struct sk_buff *skb, u32 ctrl_flags)
 755{
 756	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 757	struct ieee80211_mesh_fast_tx_key key = {
 758		.type = MESH_FAST_TX_TYPE_LOCAL
 759	};
 760	struct ieee80211_mesh_fast_tx *entry;
 761	struct ieee80211s_hdr *meshhdr;
 762	u8 sa[ETH_ALEN] __aligned(2);
 763	struct tid_ampdu_tx *tid_tx;
 764	struct sta_info *sta;
 765	bool copy_sa = false;
 766	u16 ethertype;
 767	u8 tid;
 768
 769	if (ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP)
 770		return false;
 771
 772	if (ifmsh->mshcfg.dot11MeshNolearn)
 773		return false;
 774
 775	/* Add support for these cases later */
 776	if (ifmsh->ps_peers_light_sleep || ifmsh->ps_peers_deep_sleep)
 777		return false;
 778
 779	if (is_multicast_ether_addr(skb->data))
 780		return false;
 781
 782	ethertype = (skb->data[12] << 8) | skb->data[13];
 783	if (ethertype < ETH_P_802_3_MIN)
 784		return false;
 785
 786	if (sk_requests_wifi_status(skb->sk))
 787		return false;
 788
 789	if (skb->ip_summed == CHECKSUM_PARTIAL) {
 790		skb_set_transport_header(skb, skb_checksum_start_offset(skb));
 791		if (skb_checksum_help(skb))
 792			return false;
 793	}
 794
 795	ether_addr_copy(key.addr, skb->data);
 796	if (!ether_addr_equal(skb->data + ETH_ALEN, sdata->vif.addr))
 797		key.type = MESH_FAST_TX_TYPE_PROXIED;
 798	entry = mesh_fast_tx_get(sdata, &key);
 799	if (!entry)
 800		return false;
 801
 802	if (skb_headroom(skb) < entry->hdrlen + entry->fast_tx.hdr_len)
 803		return false;
 804
 805	sta = rcu_dereference(entry->mpath->next_hop);
 806	if (!sta)
 807		return false;
 808
 809	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
 810	tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 811	if (tid_tx) {
 812		if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
 813			return false;
 814		if (tid_tx->timeout)
 815			tid_tx->last_tx = jiffies;
 816	}
 817
 818	skb = skb_share_check(skb, GFP_ATOMIC);
 819	if (!skb)
 820		return true;
 821
 822	skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb));
 823
 824	meshhdr = (struct ieee80211s_hdr *)entry->hdr;
 825	if ((meshhdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) {
 826		/* preserve SA from eth header for 6-addr frames */
 827		ether_addr_copy(sa, skb->data + ETH_ALEN);
 828		copy_sa = true;
 829	}
 830
 831	memcpy(skb_push(skb, entry->hdrlen - 2 * ETH_ALEN), entry->hdr,
 832	       entry->hdrlen);
 833
 834	meshhdr = (struct ieee80211s_hdr *)skb->data;
 835	put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
 836			   &meshhdr->seqnum);
 837	meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 838	if (copy_sa)
 839	    ether_addr_copy(meshhdr->eaddr2, sa);
 840
 841	skb_push(skb, 2 * ETH_ALEN);
 842	__ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
 843			      entry->mpath->dst, sdata->vif.addr);
 844
 845	return true;
 846}
 847
 848/**
 849 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 850 * @hdr:	802.11 frame header
 851 * @fc:		frame control field
 852 * @meshda:	destination address in the mesh
 853 * @meshsa:	source address in the mesh.  Same as TA, as frame is
 854 *              locally originated.
 855 *
 856 * Returns: the length of the 802.11 frame header (excludes mesh control header)
 857 */
 858int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 859				  const u8 *meshda, const u8 *meshsa)
 860{
 861	if (is_multicast_ether_addr(meshda)) {
 862		*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 863		/* DA TA SA */
 864		memcpy(hdr->addr1, meshda, ETH_ALEN);
 865		memcpy(hdr->addr2, meshsa, ETH_ALEN);
 866		memcpy(hdr->addr3, meshsa, ETH_ALEN);
 867		return 24;
 868	} else {
 869		*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 870		/* RA TA DA SA */
 871		eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 872		memcpy(hdr->addr2, meshsa, ETH_ALEN);
 873		memcpy(hdr->addr3, meshda, ETH_ALEN);
 874		memcpy(hdr->addr4, meshsa, ETH_ALEN);
 875		return 30;
 876	}
 877}
 878
 879/**
 880 * ieee80211_new_mesh_header - create a new mesh header
 881 * @sdata:	mesh interface to be used
 882 * @meshhdr:    uninitialized mesh header
 883 * @addr4or5:   1st address in the ae header, which may correspond to address 4
 884 *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 885 *              be NULL.
 886 * @addr6:	2nd address in the ae header, which corresponds to addr6 of the
 887 *              mesh frame
 888 *
 889 * Returns: the header length
 890 */
 891unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 892				       struct ieee80211s_hdr *meshhdr,
 893				       const char *addr4or5, const char *addr6)
 894{
 895	if (WARN_ON(!addr4or5 && addr6))
 896		return 0;
 897
 898	memset(meshhdr, 0, sizeof(*meshhdr));
 899
 900	meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 901
 902	put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
 903			   &meshhdr->seqnum);
 904	if (addr4or5 && !addr6) {
 905		meshhdr->flags |= MESH_FLAGS_AE_A4;
 906		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 907		return 2 * ETH_ALEN;
 908	} else if (addr4or5 && addr6) {
 909		meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 910		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 911		memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 912		return 3 * ETH_ALEN;
 913	}
 914
 915	return ETH_ALEN;
 916}
 917
 918static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 919{
 920	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 921	u64 changed;
 922
 923	if (ifmsh->mshcfg.plink_timeout > 0)
 924		ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 925	mesh_path_expire(sdata);
 926
 927	changed = mesh_accept_plinks_update(sdata);
 928	ieee80211_mbss_info_change_notify(sdata, changed);
 929
 930	mesh_fast_tx_gc(sdata);
 931
 932	mod_timer(&ifmsh->housekeeping_timer,
 933		  round_jiffies(jiffies +
 934				IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 935}
 936
 937static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 938{
 939	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 940	u32 interval;
 941
 942	mesh_path_tx_root_frame(sdata);
 943
 944	if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 945		interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 946	else
 947		interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 948
 949	mod_timer(&ifmsh->mesh_path_root_timer,
 950		  round_jiffies(TU_TO_EXP_TIME(interval)));
 951}
 952
 953static int
 954ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 955{
 956	struct beacon_data *bcn;
 957	int head_len, tail_len;
 958	struct sk_buff *skb;
 959	struct ieee80211_mgmt *mgmt;
 960	struct mesh_csa_settings *csa;
 961	const struct ieee80211_supported_band *sband;
 962	u8 ie_len_he_cap, ie_len_eht_cap;
 963	u8 *pos;
 964	struct ieee80211_sub_if_data *sdata;
 965	int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
 966
 967	sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 968
 969	sband = ieee80211_get_sband(sdata);
 970
 971	ie_len_he_cap = ieee80211_ie_len_he_cap(sdata);
 972	ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata);
 973	head_len = hdr_len +
 974		   2 + /* NULL SSID */
 975		   /* Channel Switch Announcement */
 976		   2 + sizeof(struct ieee80211_channel_sw_ie) +
 977		   /* Mesh Channel Switch Parameters */
 978		   2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 979		   /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
 980		   2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
 981		   2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
 982		   2 + 8 + /* supported rates */
 983		   2 + 3; /* DS params */
 984	tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 985		   2 + sizeof(struct ieee80211_ht_cap) +
 986		   2 + sizeof(struct ieee80211_ht_operation) +
 987		   2 + ifmsh->mesh_id_len +
 988		   2 + sizeof(struct ieee80211_meshconf_ie) +
 989		   2 + sizeof(__le16) + /* awake window */
 990		   2 + sizeof(struct ieee80211_vht_cap) +
 991		   2 + sizeof(struct ieee80211_vht_operation) +
 992		   ie_len_he_cap +
 993		   2 + 1 + sizeof(struct ieee80211_he_operation) +
 994			   sizeof(struct ieee80211_he_6ghz_oper) +
 995		   2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
 996		   ie_len_eht_cap +
 997		   2 + 1 + offsetof(struct ieee80211_eht_operation, optional) +
 998			   offsetof(struct ieee80211_eht_operation_info, optional) +
 999		   ifmsh->ie_len;
1000
1001	bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
1002	/* need an skb for IE builders to operate on */
1003	skb = __dev_alloc_skb(max(head_len, tail_len), GFP_KERNEL);
1004
1005	if (!bcn || !skb)
1006		goto out_free;
1007
1008	/*
1009	 * pointers go into the block we allocated,
1010	 * memory is | beacon_data | head | tail |
1011	 */
1012	bcn->head = ((u8 *) bcn) + sizeof(*bcn);
1013
1014	/* fill in the head */
1015	mgmt = skb_put_zero(skb, hdr_len);
1016	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1017					  IEEE80211_STYPE_BEACON);
1018	eth_broadcast_addr(mgmt->da);
1019	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1020	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
1021	ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
1022	mgmt->u.beacon.beacon_int =
1023		cpu_to_le16(sdata->vif.bss_conf.beacon_int);
1024	mgmt->u.beacon.capab_info |= cpu_to_le16(
1025		sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
1026
1027	pos = skb_put(skb, 2);
1028	*pos++ = WLAN_EID_SSID;
1029	*pos++ = 0x0;
1030
1031	rcu_read_lock();
1032	csa = rcu_dereference(ifmsh->csa);
1033	if (csa) {
1034		enum nl80211_channel_type ct;
1035		struct cfg80211_chan_def *chandef;
1036		int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
1037			     2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
1038
1039		pos = skb_put_zero(skb, ie_len);
1040		*pos++ = WLAN_EID_CHANNEL_SWITCH;
1041		*pos++ = 3;
1042		*pos++ = 0x0;
1043		*pos++ = ieee80211_frequency_to_channel(
1044				csa->settings.chandef.chan->center_freq);
1045		bcn->cntdwn_current_counter = csa->settings.count;
1046		bcn->cntdwn_counter_offsets[0] = hdr_len + 6;
1047		*pos++ = csa->settings.count;
1048		*pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
1049		*pos++ = 6;
1050		if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
1051			*pos++ = ifmsh->mshcfg.dot11MeshTTL;
1052			*pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1053		} else {
1054			*pos++ = ifmsh->chsw_ttl;
1055		}
1056		*pos++ |= csa->settings.block_tx ?
1057			  WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
1058		put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
1059		pos += 2;
1060		put_unaligned_le16(ifmsh->pre_value, pos);
1061		pos += 2;
1062
1063		switch (csa->settings.chandef.width) {
1064		case NL80211_CHAN_WIDTH_40:
1065			ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
1066			pos = skb_put_zero(skb, ie_len);
1067
1068			*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
1069			*pos++ = 1;				    /* len */
1070			ct = cfg80211_get_chandef_type(&csa->settings.chandef);
1071			if (ct == NL80211_CHAN_HT40PLUS)
1072				*pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1073			else
1074				*pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1075			break;
1076		case NL80211_CHAN_WIDTH_80:
1077		case NL80211_CHAN_WIDTH_80P80:
1078		case NL80211_CHAN_WIDTH_160:
1079			/* Channel Switch Wrapper + Wide Bandwidth CSA IE */
1080			ie_len = 2 + 2 +
1081				 sizeof(struct ieee80211_wide_bw_chansw_ie);
1082			pos = skb_put_zero(skb, ie_len);
1083
1084			*pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
1085			*pos++ = 5;				  /* len */
1086			/* put sub IE */
1087			chandef = &csa->settings.chandef;
1088			ieee80211_ie_build_wide_bw_cs(pos, chandef);
1089			break;
1090		default:
1091			break;
1092		}
1093	}
1094	rcu_read_unlock();
1095
1096	if (ieee80211_put_srates_elem(skb, sband,
1097				      sdata->vif.bss_conf.basic_rates,
1098				      0, WLAN_EID_SUPP_RATES) ||
1099	    mesh_add_ds_params_ie(sdata, skb))
1100		goto out_free;
1101
1102	bcn->head_len = skb->len;
1103	memcpy(bcn->head, skb->data, bcn->head_len);
1104
1105	/* now the tail */
1106	skb_trim(skb, 0);
1107	bcn->tail = bcn->head + bcn->head_len;
1108
1109	if (ieee80211_put_srates_elem(skb, sband,
1110				      sdata->vif.bss_conf.basic_rates,
1111				      0, WLAN_EID_EXT_SUPP_RATES) ||
1112	    mesh_add_rsn_ie(sdata, skb) ||
1113	    mesh_add_ht_cap_ie(sdata, skb) ||
1114	    mesh_add_ht_oper_ie(sdata, skb) ||
1115	    mesh_add_meshid_ie(sdata, skb) ||
1116	    mesh_add_meshconf_ie(sdata, skb) ||
1117	    mesh_add_awake_window_ie(sdata, skb) ||
1118	    mesh_add_vht_cap_ie(sdata, skb) ||
1119	    mesh_add_vht_oper_ie(sdata, skb) ||
1120	    mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
1121	    mesh_add_he_oper_ie(sdata, skb) ||
1122	    mesh_add_he_6ghz_cap_ie(sdata, skb) ||
1123	    mesh_add_eht_cap_ie(sdata, skb, ie_len_eht_cap) ||
1124	    mesh_add_eht_oper_ie(sdata, skb) ||
1125	    mesh_add_vendor_ies(sdata, skb))
1126		goto out_free;
1127
1128	bcn->tail_len = skb->len;
1129	memcpy(bcn->tail, skb->data, bcn->tail_len);
1130	ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len);
1131	bcn->meshconf = (struct ieee80211_meshconf_ie *)
1132					(bcn->tail + ifmsh->meshconf_offset);
1133
1134	dev_kfree_skb(skb);
1135	rcu_assign_pointer(ifmsh->beacon, bcn);
1136	return 0;
1137out_free:
1138	kfree(bcn);
1139	dev_kfree_skb(skb);
1140	return -ENOMEM;
1141}
1142
1143static int
1144ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
1145{
1146	struct beacon_data *old_bcn;
1147	int ret;
1148
1149	old_bcn = sdata_dereference(sdata->u.mesh.beacon, sdata);
1150	ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
1151	if (ret)
1152		/* just reuse old beacon */
1153		return ret;
1154
1155	if (old_bcn)
1156		kfree_rcu(old_bcn, rcu_head);
1157	return 0;
1158}
1159
1160void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1161				       u64 changed)
1162{
1163	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1164	unsigned long bits[] = { BITMAP_FROM_U64(changed) };
1165	u32 bit;
1166
1167	if (!changed)
1168		return;
1169
1170	/* if we race with running work, worst case this work becomes a noop */
1171	for_each_set_bit(bit, bits, sizeof(changed) * BITS_PER_BYTE)
1172		set_bit(bit, ifmsh->mbss_changed);
1173	set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
1174	wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1175}
1176
1177int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
1178{
1179	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1180	struct ieee80211_local *local = sdata->local;
1181	u64 changed = BSS_CHANGED_BEACON |
1182		      BSS_CHANGED_BEACON_ENABLED |
1183		      BSS_CHANGED_HT |
1184		      BSS_CHANGED_BASIC_RATES |
1185		      BSS_CHANGED_BEACON_INT |
1186		      BSS_CHANGED_MCAST_RATE;
1187
1188	local->fif_other_bss++;
1189	/* mesh ifaces must set allmulti to forward mcast traffic */
1190	atomic_inc(&local->iff_allmultis);
1191	ieee80211_configure_filter(local);
1192
1193	ifmsh->mesh_cc_id = 0;	/* Disabled */
1194	/* register sync ops from extensible synchronization framework */
1195	ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1196	ifmsh->sync_offset_clockdrift_max = 0;
1197	set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1198	ieee80211_mesh_root_setup(ifmsh);
1199	wiphy_work_queue(local->hw.wiphy, &sdata->work);
1200	sdata->vif.bss_conf.ht_operation_mode =
1201				ifmsh->mshcfg.ht_opmode;
1202	sdata->vif.bss_conf.enable_beacon = true;
1203
1204	changed |= ieee80211_mps_local_status_update(sdata);
1205
1206	if (ieee80211_mesh_build_beacon(ifmsh)) {
1207		ieee80211_stop_mesh(sdata);
1208		return -ENOMEM;
1209	}
1210
1211	ieee80211_recalc_dtim(sdata, drv_get_tsf(local, sdata));
1212	ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1213
1214	netif_carrier_on(sdata->dev);
1215	return 0;
1216}
1217
1218void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1219{
1220	struct ieee80211_local *local = sdata->local;
1221	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1222	struct beacon_data *bcn;
1223
1224	netif_carrier_off(sdata->dev);
1225
1226	/* flush STAs and mpaths on this iface */
1227	sta_info_flush(sdata, -1);
1228	ieee80211_free_keys(sdata, true);
1229	mesh_path_flush_by_iface(sdata);
1230
1231	/* stop the beacon */
1232	ifmsh->mesh_id_len = 0;
1233	sdata->vif.bss_conf.enable_beacon = false;
1234	sdata->beacon_rate_set = false;
1235	clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1236	ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1237					  BSS_CHANGED_BEACON_ENABLED);
1238
1239	/* remove beacon */
1240	bcn = sdata_dereference(ifmsh->beacon, sdata);
1241	RCU_INIT_POINTER(ifmsh->beacon, NULL);
1242	kfree_rcu(bcn, rcu_head);
1243
1244	/* free all potentially still buffered group-addressed frames */
1245	local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1246	skb_queue_purge(&ifmsh->ps.bc_buf);
1247
1248	timer_delete_sync(&sdata->u.mesh.housekeeping_timer);
1249	timer_delete_sync(&sdata->u.mesh.mesh_path_root_timer);
1250	timer_delete_sync(&sdata->u.mesh.mesh_path_timer);
1251
1252	/* clear any mesh work (for next join) we may have accrued */
1253	ifmsh->wrkq_flags = 0;
1254	memset(ifmsh->mbss_changed, 0, sizeof(ifmsh->mbss_changed));
1255
1256	local->fif_other_bss--;
1257	atomic_dec(&local->iff_allmultis);
1258	ieee80211_configure_filter(local);
1259}
1260
1261static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1262{
1263	int err;
1264
1265	/* if the current channel is a DFS channel, mark the channel as
1266	 * unavailable.
1267	 */
1268	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1269					    &sdata->vif.bss_conf.chanreq.oper,
1270					    NL80211_IFTYPE_MESH_POINT);
1271	if (err > 0)
1272		cfg80211_radar_event(sdata->local->hw.wiphy,
1273				     &sdata->vif.bss_conf.chanreq.oper,
1274				     GFP_ATOMIC);
1275}
1276
1277static bool
1278ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1279				 struct ieee802_11_elems *elems, bool beacon)
1280{
1281	struct cfg80211_csa_settings params;
1282	struct ieee80211_csa_ie csa_ie;
1283	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1284	struct ieee80211_supported_band *sband;
1285	int err;
1286	struct ieee80211_conn_settings conn = ieee80211_conn_settings_unlimited;
1287	u32 vht_cap_info = 0;
1288
1289	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1290
1291	sband = ieee80211_get_sband(sdata);
1292	if (!sband)
1293		return false;
1294
1295	switch (sdata->vif.bss_conf.chanreq.oper.width) {
1296	case NL80211_CHAN_WIDTH_20_NOHT:
1297		conn.mode = IEEE80211_CONN_MODE_LEGACY;
1298		conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20;
1299		break;
1300	case NL80211_CHAN_WIDTH_20:
1301		conn.mode = IEEE80211_CONN_MODE_HT;
1302		conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20;
1303		break;
1304	case NL80211_CHAN_WIDTH_40:
1305		conn.mode = IEEE80211_CONN_MODE_HT;
1306		conn.bw_limit = IEEE80211_CONN_BW_LIMIT_40;
1307		break;
1308	default:
1309		break;
1310	}
1311
1312	if (elems->vht_cap_elem)
1313		vht_cap_info =
1314			le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1315
1316	memset(&params, 0, sizeof(params));
1317	err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1318					   vht_cap_info, &conn,
1319					   sdata->vif.addr, false,
1320					   &csa_ie);
1321	if (err < 0)
1322		return false;
1323	if (err)
1324		return false;
1325
1326	/* Mark the channel unavailable if the reason for the switch is
1327	 * regulatory.
1328	 */
1329	if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1330		ieee80211_mesh_csa_mark_radar(sdata);
1331
1332	params.chandef = csa_ie.chanreq.oper;
1333	params.count = csa_ie.count;
1334
1335	if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1336				     IEEE80211_CHAN_DISABLED) ||
1337	    !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1338				     NL80211_IFTYPE_MESH_POINT)) {
1339		sdata_info(sdata,
1340			   "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1341			   sdata->vif.addr,
1342			   params.chandef.chan->center_freq,
1343			   params.chandef.width,
1344			   params.chandef.center_freq1,
1345			   params.chandef.center_freq2);
1346		return false;
1347	}
1348
1349	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1350					    &params.chandef,
1351					    NL80211_IFTYPE_MESH_POINT);
1352	if (err < 0)
1353		return false;
1354	if (err > 0 && !ifmsh->userspace_handles_dfs) {
1355		sdata_info(sdata,
1356			   "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1357			   sdata->vif.addr,
1358			   params.chandef.chan->center_freq,
1359			   params.chandef.width,
1360			   params.chandef.center_freq1,
1361			   params.chandef.center_freq2);
1362		return false;
1363	}
1364
1365	params.radar_required = err;
1366
1367	if (cfg80211_chandef_identical(&params.chandef,
1368				       &sdata->vif.bss_conf.chanreq.oper)) {
1369		mcsa_dbg(sdata,
1370			 "received csa with an identical chandef, ignoring\n");
1371		return true;
1372	}
1373
1374	mcsa_dbg(sdata,
1375		 "received channel switch announcement to go to channel %d MHz\n",
1376		 params.chandef.chan->center_freq);
1377
1378	params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1379	if (beacon) {
1380		ifmsh->chsw_ttl = csa_ie.ttl - 1;
1381		if (ifmsh->pre_value >= csa_ie.pre_value)
1382			return false;
1383		ifmsh->pre_value = csa_ie.pre_value;
1384	}
1385
1386	if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1387		return false;
1388
1389	ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1390
1391	if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1392				     &params) < 0)
1393		return false;
1394
1395	return true;
1396}
1397
1398static void
1399ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1400			    struct ieee80211_mgmt *mgmt, size_t len)
1401{
1402	struct ieee80211_local *local = sdata->local;
1403	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1404	struct sk_buff *presp;
1405	struct beacon_data *bcn;
1406	struct ieee80211_mgmt *hdr;
1407	struct ieee802_11_elems *elems;
1408	size_t baselen;
1409	u8 *pos;
1410
1411	pos = mgmt->u.probe_req.variable;
1412	baselen = (u8 *) pos - (u8 *) mgmt;
1413	if (baselen > len)
1414		return;
1415
1416	elems = ieee802_11_parse_elems(pos, len - baselen,
1417				       IEEE80211_FTYPE_MGMT |
1418				       IEEE80211_STYPE_PROBE_REQ,
1419				       NULL);
1420	if (!elems)
1421		return;
1422
1423	if (!elems->mesh_id)
1424		goto free;
1425
1426	/* 802.11-2012 10.1.4.3.2 */
1427	if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1428	     !is_broadcast_ether_addr(mgmt->da)) ||
1429	    elems->ssid_len != 0)
1430		goto free;
1431
1432	if (elems->mesh_id_len != 0 &&
1433	    (elems->mesh_id_len != ifmsh->mesh_id_len ||
1434	     memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1435		goto free;
1436
1437	rcu_read_lock();
1438	bcn = rcu_dereference(ifmsh->beacon);
1439
1440	if (!bcn)
1441		goto out;
1442
1443	presp = dev_alloc_skb(local->tx_headroom +
1444			      bcn->head_len + bcn->tail_len);
1445	if (!presp)
1446		goto out;
1447
1448	skb_reserve(presp, local->tx_headroom);
1449	skb_put_data(presp, bcn->head, bcn->head_len);
1450	skb_put_data(presp, bcn->tail, bcn->tail_len);
1451	hdr = (struct ieee80211_mgmt *) presp->data;
1452	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1453					 IEEE80211_STYPE_PROBE_RESP);
1454	memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1455	IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1456	ieee80211_tx_skb(sdata, presp);
1457out:
1458	rcu_read_unlock();
1459free:
1460	kfree(elems);
1461}
1462
1463static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1464					struct ieee80211_mgmt *mgmt,
1465					size_t len,
1466					struct ieee80211_rx_status *rx_status)
1467{
1468	u16 type = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_TYPE;
1469	struct ieee80211_local *local = sdata->local;
1470	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1471	struct ieee802_11_elems *elems;
1472	struct ieee80211_channel *channel;
1473	size_t baselen;
1474	int freq;
1475	enum nl80211_band band = rx_status->band;
1476
1477	/* ignore ProbeResp to foreign address */
1478	if (type == (IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_RESP) &&
1479	    !ether_addr_equal(mgmt->da, sdata->vif.addr))
1480		return;
1481
1482	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1483	if (baselen > len)
1484		return;
1485
1486	elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1487				       len - baselen, type, NULL);
1488	if (!elems)
1489		return;
1490
1491	/* ignore non-mesh or secure / insecure mismatch */
1492	if ((!elems->mesh_id || !elems->mesh_config) ||
1493	    (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1494	    (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1495		goto free;
1496
1497	if (elems->ds_params)
1498		freq = ieee80211_channel_to_frequency(elems->ds_params[0], band);
1499	else
1500		freq = rx_status->freq;
1501
1502	channel = ieee80211_get_channel(local->hw.wiphy, freq);
1503
1504	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1505		goto free;
1506
1507	if (mesh_matches_local(sdata, elems)) {
1508		mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1509			sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1510		if (!sdata->u.mesh.user_mpm ||
1511		    sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1512		    sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1513			mesh_neighbour_update(sdata, mgmt->sa, elems,
1514					      rx_status);
1515
1516		if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1517		    !sdata->vif.bss_conf.csa_active)
1518			ieee80211_mesh_process_chnswitch(sdata, elems, true);
1519	}
1520
1521	if (ifmsh->sync_ops)
1522		ifmsh->sync_ops->rx_bcn_presp(sdata,
1523					      type & IEEE80211_FCTL_STYPE,
1524					      mgmt, len,
1525					      elems->mesh_config, rx_status);
1526free:
1527	kfree(elems);
1528}
1529
1530int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed)
1531{
1532	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1533	struct mesh_csa_settings *tmp_csa_settings;
1534	int ret = 0;
1535
1536	/* Reset the TTL value and Initiator flag */
1537	ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1538	ifmsh->chsw_ttl = 0;
1539
1540	/* Remove the CSA and MCSP elements from the beacon */
1541	tmp_csa_settings = sdata_dereference(ifmsh->csa, sdata);
1542	RCU_INIT_POINTER(ifmsh->csa, NULL);
1543	if (tmp_csa_settings)
1544		kfree_rcu(tmp_csa_settings, rcu_head);
1545	ret = ieee80211_mesh_rebuild_beacon(sdata);
1546	if (ret)
1547		return -EINVAL;
1548
1549	*changed |= BSS_CHANGED_BEACON;
1550
1551	mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1552		 sdata->vif.bss_conf.chanreq.oper.chan->center_freq);
1553	return 0;
1554}
1555
1556int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1557			      struct cfg80211_csa_settings *csa_settings,
1558			      u64 *changed)
1559{
1560	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1561	struct mesh_csa_settings *tmp_csa_settings;
1562	int ret = 0;
1563
1564	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1565
1566	tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1567				   GFP_ATOMIC);
1568	if (!tmp_csa_settings)
1569		return -ENOMEM;
1570
1571	memcpy(&tmp_csa_settings->settings, csa_settings,
1572	       sizeof(struct cfg80211_csa_settings));
1573
1574	rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1575
1576	ret = ieee80211_mesh_rebuild_beacon(sdata);
1577	if (ret) {
1578		tmp_csa_settings = rcu_dereference(ifmsh->csa);
1579		RCU_INIT_POINTER(ifmsh->csa, NULL);
1580		kfree_rcu(tmp_csa_settings, rcu_head);
1581		return ret;
1582	}
1583
1584	*changed |= BSS_CHANGED_BEACON;
1585	return 0;
1586}
1587
1588static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1589			       struct ieee80211_mgmt *mgmt, size_t len,
1590			       struct ieee802_11_elems *elems)
1591{
1592	struct ieee80211_mgmt *mgmt_fwd;
1593	struct sk_buff *skb;
1594	struct ieee80211_local *local = sdata->local;
1595
1596	skb = dev_alloc_skb(local->tx_headroom + len);
1597	if (!skb)
1598		return -ENOMEM;
1599	skb_reserve(skb, local->tx_headroom);
1600	mgmt_fwd = skb_put(skb, len);
1601
1602	elems->mesh_chansw_params_ie->mesh_ttl--;
1603	elems->mesh_chansw_params_ie->mesh_flags &=
1604		~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1605
1606	memcpy(mgmt_fwd, mgmt, len);
1607	eth_broadcast_addr(mgmt_fwd->da);
1608	memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1609	memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1610
1611	ieee80211_tx_skb(sdata, skb);
1612	return 0;
1613}
1614
1615static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1616			      struct ieee80211_mgmt *mgmt, size_t len)
1617{
1618	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1619	struct ieee802_11_elems *elems;
1620	u16 pre_value;
1621	bool fwd_csa = true;
1622	size_t baselen;
1623	u8 *pos;
1624
1625	if (mgmt->u.action.u.measurement.action_code !=
1626	    WLAN_ACTION_SPCT_CHL_SWITCH)
1627		return;
1628
1629	pos = mgmt->u.action.u.chan_switch.variable;
1630	baselen = offsetof(struct ieee80211_mgmt,
1631			   u.action.u.chan_switch.variable);
1632	elems = ieee802_11_parse_elems(pos, len - baselen,
1633				       IEEE80211_FTYPE_MGMT |
1634				       IEEE80211_STYPE_ACTION,
1635				       NULL);
1636	if (!elems)
1637		return;
1638
1639	if (!mesh_matches_local(sdata, elems))
1640		goto free;
1641
1642	if (!elems->mesh_chansw_params_ie)
1643		goto free;
1644
1645	ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl;
1646	if (!--ifmsh->chsw_ttl)
1647		fwd_csa = false;
1648
1649	pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value);
1650	if (ifmsh->pre_value >= pre_value)
1651		goto free;
1652
1653	ifmsh->pre_value = pre_value;
1654
1655	if (!sdata->vif.bss_conf.csa_active &&
1656	    !ieee80211_mesh_process_chnswitch(sdata, elems, false)) {
1657		mcsa_dbg(sdata, "Failed to process CSA action frame");
1658		goto free;
1659	}
1660
1661	/* forward or re-broadcast the CSA frame */
1662	if (fwd_csa) {
1663		if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0)
1664			mcsa_dbg(sdata, "Failed to forward the CSA frame");
1665	}
1666free:
1667	kfree(elems);
1668}
1669
1670static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1671					  struct ieee80211_mgmt *mgmt,
1672					  size_t len,
1673					  struct ieee80211_rx_status *rx_status)
1674{
1675	switch (mgmt->u.action.category) {
1676	case WLAN_CATEGORY_SELF_PROTECTED:
1677		switch (mgmt->u.action.u.self_prot.action_code) {
1678		case WLAN_SP_MESH_PEERING_OPEN:
1679		case WLAN_SP_MESH_PEERING_CLOSE:
1680		case WLAN_SP_MESH_PEERING_CONFIRM:
1681			mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1682			break;
1683		}
1684		break;
1685	case WLAN_CATEGORY_MESH_ACTION:
1686		if (mesh_action_is_path_sel(mgmt))
1687			mesh_rx_path_sel_frame(sdata, mgmt, len);
1688		break;
1689	case WLAN_CATEGORY_SPECTRUM_MGMT:
1690		mesh_rx_csa_frame(sdata, mgmt, len);
1691		break;
1692	}
1693}
1694
1695void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1696				   struct sk_buff *skb)
1697{
1698	struct ieee80211_rx_status *rx_status;
1699	struct ieee80211_mgmt *mgmt;
1700	u16 stype;
1701
1702	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1703
1704	/* mesh already went down */
1705	if (!sdata->u.mesh.mesh_id_len)
1706		return;
1707
1708	rx_status = IEEE80211_SKB_RXCB(skb);
1709	mgmt = (struct ieee80211_mgmt *) skb->data;
1710	stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1711
1712	switch (stype) {
1713	case IEEE80211_STYPE_PROBE_RESP:
1714	case IEEE80211_STYPE_BEACON:
1715		ieee80211_mesh_rx_bcn_presp(sdata, mgmt, skb->len, rx_status);
1716		break;
1717	case IEEE80211_STYPE_PROBE_REQ:
1718		ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1719		break;
1720	case IEEE80211_STYPE_ACTION:
1721		ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1722		break;
1723	}
1724}
1725
1726static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1727{
1728	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1729	u32 bit;
1730	u64 changed = 0;
1731
1732	for_each_set_bit(bit, ifmsh->mbss_changed,
1733			 sizeof(changed) * BITS_PER_BYTE) {
1734		clear_bit(bit, ifmsh->mbss_changed);
1735		changed |= BIT(bit);
1736	}
1737
1738	if (sdata->vif.bss_conf.enable_beacon &&
1739	    (changed & (BSS_CHANGED_BEACON |
1740			BSS_CHANGED_HT |
1741			BSS_CHANGED_BASIC_RATES |
1742			BSS_CHANGED_BEACON_INT)))
1743		if (ieee80211_mesh_rebuild_beacon(sdata))
1744			return;
1745
1746	ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1747}
1748
1749void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1750{
1751	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1752
1753	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1754
1755	/* mesh already went down */
1756	if (!sdata->u.mesh.mesh_id_len)
1757		return;
1758
1759	if (ifmsh->preq_queue_len &&
1760	    time_after(jiffies,
1761		       ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1762		mesh_path_start_discovery(sdata);
1763
1764	if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1765		ieee80211_mesh_housekeeping(sdata);
1766
1767	if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1768		ieee80211_mesh_rootpath(sdata);
1769
1770	if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1771		mesh_sync_adjust_tsf(sdata);
1772
1773	if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1774		mesh_bss_info_changed(sdata);
1775}
1776
1777
1778void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1779{
1780	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1781	static u8 zero_addr[ETH_ALEN] = {};
1782
1783	timer_setup(&ifmsh->housekeeping_timer,
1784		    ieee80211_mesh_housekeeping_timer, 0);
1785
1786	ifmsh->accepting_plinks = true;
1787	atomic_set(&ifmsh->mpaths, 0);
1788	mesh_rmc_init(sdata);
1789	ifmsh->last_preq = jiffies;
1790	ifmsh->next_perr = jiffies;
1791	ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1792	ifmsh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
1793	/* Allocate all mesh structures when creating the first mesh interface. */
1794	if (!mesh_allocated)
1795		ieee80211s_init();
1796
1797	mesh_pathtbl_init(sdata);
1798
1799	timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1800	timer_setup(&ifmsh->mesh_path_root_timer,
1801		    ieee80211_mesh_path_root_timer, 0);
1802	INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1803	skb_queue_head_init(&ifmsh->ps.bc_buf);
1804	spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1805	spin_lock_init(&ifmsh->sync_offset_lock);
1806	RCU_INIT_POINTER(ifmsh->beacon, NULL);
1807
1808	sdata->vif.bss_conf.bssid = zero_addr;
1809}
1810
1811void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1812{
1813	mesh_rmc_free(sdata);
1814	mesh_pathtbl_unregister(sdata);
1815}