net/mac80211/mesh.c

   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
  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
  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
  31 void ieee80211s_stop(void)
  32 {
  33         if (!mesh_allocated)
  34                 return;
  35         kmem_cache_destroy(rm_cache);
  36 }
  37
  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  */
  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  */
 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  */
 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  */
 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
 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
 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  */
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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  */
 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  */
 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
 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
 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
 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
 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 = sdata_dereference(sdata->u.mesh.beacon, sdata);
 997         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 998         if (ret)
 999                 /* just reuse old beacon */
1000                 return ret;
1001
1002         if (old_bcn)
1003                 kfree_rcu(old_bcn, rcu_head);
1004         return 0;
1005 }
1006
1007 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1008                                        u32 changed)
1009 {
1010         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1011         unsigned long bits = changed;
1012         u32 bit;
1013
1014         if (!bits)
1015                 return;
1016
1017         /* if we race with running work, worst case this work becomes a noop */
1018         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
1019                 set_bit(bit, &ifmsh->mbss_changed);
1020         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
1021         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1022 }
1023
1024 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
1025 {
1026         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1027         struct ieee80211_local *local = sdata->local;
1028         u32 changed = BSS_CHANGED_BEACON |
1029                       BSS_CHANGED_BEACON_ENABLED |
1030                       BSS_CHANGED_HT |
1031                       BSS_CHANGED_BASIC_RATES |
1032                       BSS_CHANGED_BEACON_INT |
1033                       BSS_CHANGED_MCAST_RATE;
1034
1035         local->fif_other_bss++;
1036         /* mesh ifaces must set allmulti to forward mcast traffic */
1037         atomic_inc(&local->iff_allmultis);
1038         ieee80211_configure_filter(local);
1039
1040         ifmsh->mesh_cc_id = 0;  /* Disabled */
1041         /* register sync ops from extensible synchronization framework */
1042         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
1043         ifmsh->sync_offset_clockdrift_max = 0;
1044         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
1045         ieee80211_mesh_root_setup(ifmsh);
1046         ieee80211_queue_work(&local->hw, &sdata->work);
1047         sdata->vif.bss_conf.ht_operation_mode =
1048                                 ifmsh->mshcfg.ht_opmode;
1049         sdata->vif.bss_conf.enable_beacon = true;
1050
1051         changed |= ieee80211_mps_local_status_update(sdata);
1052
1053         if (ieee80211_mesh_build_beacon(ifmsh)) {
1054                 ieee80211_stop_mesh(sdata);
1055                 return -ENOMEM;
1056         }
1057
1058         ieee80211_recalc_dtim(local, sdata);
1059         ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1060
1061         netif_carrier_on(sdata->dev);
1062         return 0;
1063 }
1064
1065 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1066 {
1067         struct ieee80211_local *local = sdata->local;
1068         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1069         struct beacon_data *bcn;
1070
1071         netif_carrier_off(sdata->dev);
1072
1073         /* flush STAs and mpaths on this iface */
1074         sta_info_flush(sdata);
1075         ieee80211_free_keys(sdata, true);
1076         mesh_path_flush_by_iface(sdata);
1077
1078         /* stop the beacon */
1079         ifmsh->mesh_id_len = 0;
1080         sdata->vif.bss_conf.enable_beacon = false;
1081         sdata->beacon_rate_set = false;
1082         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1083         ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1084                                           BSS_CHANGED_BEACON_ENABLED);
1085
1086         /* remove beacon */
1087         bcn = sdata_dereference(ifmsh->beacon, sdata);
1088         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1089         kfree_rcu(bcn, rcu_head);
1090
1091         /* free all potentially still buffered group-addressed frames */
1092         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1093         skb_queue_purge(&ifmsh->ps.bc_buf);
1094
1095         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1096         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1097         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1098
1099         /* clear any mesh work (for next join) we may have accrued */
1100         ifmsh->wrkq_flags = 0;
1101         ifmsh->mbss_changed = 0;
1102
1103         local->fif_other_bss--;
1104         atomic_dec(&local->iff_allmultis);
1105         ieee80211_configure_filter(local);
1106 }
1107
1108 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1109 {
1110         int err;
1111
1112         /* if the current channel is a DFS channel, mark the channel as
1113          * unavailable.
1114          */
1115         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1116                                             &sdata->vif.bss_conf.chandef,
1117                                             NL80211_IFTYPE_MESH_POINT);
1118         if (err > 0)
1119                 cfg80211_radar_event(sdata->local->hw.wiphy,
1120                                      &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1121 }
1122
1123 static bool
1124 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1125                                  struct ieee802_11_elems *elems, bool beacon)
1126 {
1127         struct cfg80211_csa_settings params;
1128         struct ieee80211_csa_ie csa_ie;
1129         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1130         struct ieee80211_supported_band *sband;
1131         int err;
1132         ieee80211_conn_flags_t conn_flags = 0;
1133         u32 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         switch (sdata->vif.bss_conf.chandef.width) {
1142         case NL80211_CHAN_WIDTH_20_NOHT:
1143                 conn_flags |= IEEE80211_CONN_DISABLE_HT;
1144                 fallthrough;
1145         case NL80211_CHAN_WIDTH_20:
1146                 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
1147                 fallthrough;
1148         case NL80211_CHAN_WIDTH_40:
1149                 conn_flags |= IEEE80211_CONN_DISABLE_VHT;
1150                 break;
1151         default:
1152                 break;
1153         }
1154
1155         if (elems->vht_cap_elem)
1156                 vht_cap_info =
1157                         le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1158
1159         memset(&params, 0, sizeof(params));
1160         err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1161                                            vht_cap_info,
1162                                            conn_flags, sdata->vif.addr,
1163                                            &csa_ie);
1164         if (err < 0)
1165                 return false;
1166         if (err)
1167                 return false;
1168
1169         /* Mark the channel unavailable if the reason for the switch is
1170          * regulatory.
1171          */
1172         if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1173                 ieee80211_mesh_csa_mark_radar(sdata);
1174
1175         params.chandef = csa_ie.chandef;
1176         params.count = csa_ie.count;
1177
1178         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1179                                      IEEE80211_CHAN_DISABLED) ||
1180             !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1181                                      NL80211_IFTYPE_MESH_POINT)) {
1182                 sdata_info(sdata,
1183                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1184                            sdata->vif.addr,
1185                            params.chandef.chan->center_freq,
1186                            params.chandef.width,
1187                            params.chandef.center_freq1,
1188                            params.chandef.center_freq2);
1189                 return false;
1190         }
1191
1192         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1193                                             &params.chandef,
1194                                             NL80211_IFTYPE_MESH_POINT);
1195         if (err < 0)
1196                 return false;
1197         if (err > 0 && !ifmsh->userspace_handles_dfs) {
1198                 sdata_info(sdata,
1199                            "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1200                            sdata->vif.addr,
1201                            params.chandef.chan->center_freq,
1202                            params.chandef.width,
1203                            params.chandef.center_freq1,
1204                            params.chandef.center_freq2);
1205                 return false;
1206         }
1207
1208         params.radar_required = err;
1209
1210         if (cfg80211_chandef_identical(&params.chandef,
1211                                        &sdata->vif.bss_conf.chandef)) {
1212                 mcsa_dbg(sdata,
1213                          "received csa with an identical chandef, ignoring\n");
1214                 return true;
1215         }
1216
1217         mcsa_dbg(sdata,
1218                  "received channel switch announcement to go to channel %d MHz\n",
1219                  params.chandef.chan->center_freq);
1220
1221         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1222         if (beacon) {
1223                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1224                 if (ifmsh->pre_value >= csa_ie.pre_value)
1225                         return false;
1226                 ifmsh->pre_value = csa_ie.pre_value;
1227         }
1228
1229         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1230                 return false;
1231
1232         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1233
1234         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1235                                      &params) < 0)
1236                 return false;
1237
1238         return true;
1239 }
1240
1241 static void
1242 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1243                             struct ieee80211_mgmt *mgmt, size_t len)
1244 {
1245         struct ieee80211_local *local = sdata->local;
1246         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1247         struct sk_buff *presp;
1248         struct beacon_data *bcn;
1249         struct ieee80211_mgmt *hdr;
1250         struct ieee802_11_elems *elems;
1251         size_t baselen;
1252         u8 *pos;
1253
1254         pos = mgmt->u.probe_req.variable;
1255         baselen = (u8 *) pos - (u8 *) mgmt;
1256         if (baselen > len)
1257                 return;
1258
1259         elems = ieee802_11_parse_elems(pos, len - baselen, false, NULL);
1260         if (!elems)
1261                 return;
1262
1263         if (!elems->mesh_id)
1264                 goto free;
1265
1266         /* 802.11-2012 10.1.4.3.2 */
1267         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1268              !is_broadcast_ether_addr(mgmt->da)) ||
1269             elems->ssid_len != 0)
1270                 goto free;
1271
1272         if (elems->mesh_id_len != 0 &&
1273             (elems->mesh_id_len != ifmsh->mesh_id_len ||
1274              memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1275                 goto free;
1276
1277         rcu_read_lock();
1278         bcn = rcu_dereference(ifmsh->beacon);
1279
1280         if (!bcn)
1281                 goto out;
1282
1283         presp = dev_alloc_skb(local->tx_headroom +
1284                               bcn->head_len + bcn->tail_len);
1285         if (!presp)
1286                 goto out;
1287
1288         skb_reserve(presp, local->tx_headroom);
1289         skb_put_data(presp, bcn->head, bcn->head_len);
1290         skb_put_data(presp, bcn->tail, bcn->tail_len);
1291         hdr = (struct ieee80211_mgmt *) presp->data;
1292         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1293                                          IEEE80211_STYPE_PROBE_RESP);
1294         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1295         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1296         ieee80211_tx_skb(sdata, presp);
1297 out:
1298         rcu_read_unlock();
1299 free:
1300         kfree(elems);
1301 }
1302
1303 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1304                                         u16 stype,
1305                                         struct ieee80211_mgmt *mgmt,
1306                                         size_t len,
1307                                         struct ieee80211_rx_status *rx_status)
1308 {
1309         struct ieee80211_local *local = sdata->local;
1310         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1311         struct ieee802_11_elems *elems;
1312         struct ieee80211_channel *channel;
1313         size_t baselen;
1314         int freq;
1315         enum nl80211_band band = rx_status->band;
1316
1317         /* ignore ProbeResp to foreign address */
1318         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1319             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1320                 return;
1321
1322         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1323         if (baselen > len)
1324                 return;
1325
1326         elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
1327                                        len - baselen,
1328                                        false, NULL);
1329         if (!elems)
1330                 return;
1331
1332         /* ignore non-mesh or secure / unsecure mismatch */
1333         if ((!elems->mesh_id || !elems->mesh_config) ||
1334             (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1335             (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1336                 goto free;
1337
1338         if (elems->ds_params)
1339                 freq = ieee80211_channel_to_frequency(elems->ds_params[0], band);
1340         else
1341                 freq = rx_status->freq;
1342
1343         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1344
1345         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1346                 goto free;
1347
1348         if (mesh_matches_local(sdata, elems)) {
1349                 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1350                         sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1351                 if (!sdata->u.mesh.user_mpm ||
1352                     sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1353                     sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1354                         mesh_neighbour_update(sdata, mgmt->sa, elems,
1355                                               rx_status);
1356
1357                 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1358                     !sdata->vif.bss_conf.csa_active)
1359                         ieee80211_mesh_process_chnswitch(sdata, elems, true);
1360         }
1361
1362         if (ifmsh->sync_ops)
1363                 ifmsh->sync_ops->rx_bcn_presp(sdata, stype, mgmt, len,
1364                                               elems->mesh_config, rx_status);
1365 free:
1366         kfree(elems);
1367 }
1368
1369 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1370 {
1371         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1372         struct mesh_csa_settings *tmp_csa_settings;
1373         int ret = 0;
1374         int changed = 0;
1375
1376         /* Reset the TTL value and Initiator flag */
1377         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1378         ifmsh->chsw_ttl = 0;
1379
1380         /* Remove the CSA and MCSP elements from the beacon */
1381         tmp_csa_settings = sdata_dereference(ifmsh->csa, sdata);
1382         RCU_INIT_POINTER(ifmsh->csa, NULL);
1383         if (tmp_csa_settings)
1384                 kfree_rcu(tmp_csa_settings, rcu_head);
1385         ret = ieee80211_mesh_rebuild_beacon(sdata);
1386         if (ret)
1387                 return -EINVAL;
1388
1389         changed |= BSS_CHANGED_BEACON;
1390
1391         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1392                  sdata->vif.bss_conf.chandef.chan->center_freq);
1393         return changed;
1394 }
1395
1396 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1397                               struct cfg80211_csa_settings *csa_settings)
1398 {
1399         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1400         struct mesh_csa_settings *tmp_csa_settings;
1401         int ret = 0;
1402
1403         lockdep_assert_held(&sdata->wdev.mtx);
1404
1405         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1406                                    GFP_ATOMIC);
1407         if (!tmp_csa_settings)
1408                 return -ENOMEM;
1409
1410         memcpy(&tmp_csa_settings->settings, csa_settings,
1411                sizeof(struct cfg80211_csa_settings));
1412
1413         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1414
1415         ret = ieee80211_mesh_rebuild_beacon(sdata);
1416         if (ret) {
1417                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1418                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1419                 kfree_rcu(tmp_csa_settings, rcu_head);
1420                 return ret;
1421         }
1422
1423         return BSS_CHANGED_BEACON;
1424 }
1425
1426 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1427                                struct ieee80211_mgmt *mgmt, size_t len,
1428                                struct ieee802_11_elems *elems)
1429 {
1430         struct ieee80211_mgmt *mgmt_fwd;
1431         struct sk_buff *skb;
1432         struct ieee80211_local *local = sdata->local;
1433
1434         skb = dev_alloc_skb(local->tx_headroom + len);
1435         if (!skb)
1436                 return -ENOMEM;
1437         skb_reserve(skb, local->tx_headroom);
1438         mgmt_fwd = skb_put(skb, len);
1439
1440         elems->mesh_chansw_params_ie->mesh_ttl--;
1441         elems->mesh_chansw_params_ie->mesh_flags &=
1442                 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1443
1444         memcpy(mgmt_fwd, mgmt, len);
1445         eth_broadcast_addr(mgmt_fwd->da);
1446         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1447         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1448
1449         ieee80211_tx_skb(sdata, skb);
1450         return 0;
1451 }
1452
1453 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1454                               struct ieee80211_mgmt *mgmt, size_t len)
1455 {
1456         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1457         struct ieee802_11_elems *elems;
1458         u16 pre_value;
1459         bool fwd_csa = true;
1460         size_t baselen;
1461         u8 *pos;
1462
1463         if (mgmt->u.action.u.measurement.action_code !=
1464             WLAN_ACTION_SPCT_CHL_SWITCH)
1465                 return;
1466
1467         pos = mgmt->u.action.u.chan_switch.variable;
1468         baselen = offsetof(struct ieee80211_mgmt,
1469                            u.action.u.chan_switch.variable);
1470         elems = ieee802_11_parse_elems(pos, len - baselen, true, NULL);
1471         if (!elems)
1472                 return;
1473
1474         if (!mesh_matches_local(sdata, elems))
1475                 goto free;
1476
1477         ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl;
1478         if (!--ifmsh->chsw_ttl)
1479                 fwd_csa = false;
1480
1481         pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value);
1482         if (ifmsh->pre_value >= pre_value)
1483                 goto free;
1484
1485         ifmsh->pre_value = pre_value;
1486
1487         if (!sdata->vif.bss_conf.csa_active &&
1488             !ieee80211_mesh_process_chnswitch(sdata, elems, false)) {
1489                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1490                 goto free;
1491         }
1492
1493         /* forward or re-broadcast the CSA frame */
1494         if (fwd_csa) {
1495                 if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0)
1496                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1497         }
1498 free:
1499         kfree(elems);
1500 }
1501
1502 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1503                                           struct ieee80211_mgmt *mgmt,
1504                                           size_t len,
1505                                           struct ieee80211_rx_status *rx_status)
1506 {
1507         switch (mgmt->u.action.category) {
1508         case WLAN_CATEGORY_SELF_PROTECTED:
1509                 switch (mgmt->u.action.u.self_prot.action_code) {
1510                 case WLAN_SP_MESH_PEERING_OPEN:
1511                 case WLAN_SP_MESH_PEERING_CLOSE:
1512                 case WLAN_SP_MESH_PEERING_CONFIRM:
1513                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1514                         break;
1515                 }
1516                 break;
1517         case WLAN_CATEGORY_MESH_ACTION:
1518                 if (mesh_action_is_path_sel(mgmt))
1519                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1520                 break;
1521         case WLAN_CATEGORY_SPECTRUM_MGMT:
1522                 mesh_rx_csa_frame(sdata, mgmt, len);
1523                 break;
1524         }
1525 }
1526
1527 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1528                                    struct sk_buff *skb)
1529 {
1530         struct ieee80211_rx_status *rx_status;
1531         struct ieee80211_mgmt *mgmt;
1532         u16 stype;
1533
1534         sdata_lock(sdata);
1535
1536         /* mesh already went down */
1537         if (!sdata->u.mesh.mesh_id_len)
1538                 goto out;
1539
1540         rx_status = IEEE80211_SKB_RXCB(skb);
1541         mgmt = (struct ieee80211_mgmt *) skb->data;
1542         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1543
1544         switch (stype) {
1545         case IEEE80211_STYPE_PROBE_RESP:
1546         case IEEE80211_STYPE_BEACON:
1547                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1548                                             rx_status);
1549                 break;
1550         case IEEE80211_STYPE_PROBE_REQ:
1551                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1552                 break;
1553         case IEEE80211_STYPE_ACTION:
1554                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1555                 break;
1556         }
1557 out:
1558         sdata_unlock(sdata);
1559 }
1560
1561 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1562 {
1563         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1564         u32 bit, changed = 0;
1565
1566         for_each_set_bit(bit, &ifmsh->mbss_changed,
1567                          sizeof(changed) * BITS_PER_BYTE) {
1568                 clear_bit(bit, &ifmsh->mbss_changed);
1569                 changed |= BIT(bit);
1570         }
1571
1572         if (sdata->vif.bss_conf.enable_beacon &&
1573             (changed & (BSS_CHANGED_BEACON |
1574                         BSS_CHANGED_HT |
1575                         BSS_CHANGED_BASIC_RATES |
1576                         BSS_CHANGED_BEACON_INT)))
1577                 if (ieee80211_mesh_rebuild_beacon(sdata))
1578                         return;
1579
1580         ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
1581 }
1582
1583 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1584 {
1585         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1586
1587         sdata_lock(sdata);
1588
1589         /* mesh already went down */
1590         if (!sdata->u.mesh.mesh_id_len)
1591                 goto out;
1592
1593         if (ifmsh->preq_queue_len &&
1594             time_after(jiffies,
1595                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1596                 mesh_path_start_discovery(sdata);
1597
1598         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1599                 ieee80211_mesh_housekeeping(sdata);
1600
1601         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1602                 ieee80211_mesh_rootpath(sdata);
1603
1604         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1605                 mesh_sync_adjust_tsf(sdata);
1606
1607         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1608                 mesh_bss_info_changed(sdata);
1609 out:
1610         sdata_unlock(sdata);
1611 }
1612
1613
1614 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1615 {
1616         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1617         static u8 zero_addr[ETH_ALEN] = {};
1618
1619         timer_setup(&ifmsh->housekeeping_timer,
1620                     ieee80211_mesh_housekeeping_timer, 0);
1621
1622         ifmsh->accepting_plinks = true;
1623         atomic_set(&ifmsh->mpaths, 0);
1624         mesh_rmc_init(sdata);
1625         ifmsh->last_preq = jiffies;
1626         ifmsh->next_perr = jiffies;
1627         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1628         /* Allocate all mesh structures when creating the first mesh interface. */
1629         if (!mesh_allocated)
1630                 ieee80211s_init();
1631
1632         mesh_pathtbl_init(sdata);
1633
1634         timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1635         timer_setup(&ifmsh->mesh_path_root_timer,
1636                     ieee80211_mesh_path_root_timer, 0);
1637         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1638         skb_queue_head_init(&ifmsh->ps.bc_buf);
1639         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1640         spin_lock_init(&ifmsh->sync_offset_lock);
1641         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1642
1643         sdata->vif.bss_conf.bssid = zero_addr;
1644 }
1645
1646 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1647 {
1648         mesh_rmc_free(sdata);
1649         mesh_pathtbl_unregister(sdata);
1650 }