net/mac80211/mesh.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2008, 2009 open80211s Ltd.
   4  * Copyright (C) 2018 - 2020 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, &sta_chan_def);
 108
 109         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 110                                          &sta_chan_def))
 111                 return false;
 112
 113         return true;
 114 }
 115
 116 /**
 117  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 118  *
 119  * @ie: information elements of a management frame from the mesh peer
 120  */
 121 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 122 {
 123         return (ie->mesh_config->meshconf_cap &
 124                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 125 }
 126
 127 /**
 128  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 129  *
 130  * @sdata: mesh interface in which mesh beacons are going to be updated
 131  *
 132  * Returns: beacon changed flag if the beacon content changed.
 133  */
 134 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 135 {
 136         bool free_plinks;
 137         u32 changed = 0;
 138
 139         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 140          * the mesh interface might be able to establish plinks with peers that
 141          * are already on the table but are not on PLINK_ESTAB state. However,
 142          * in general the mesh interface is not accepting peer link requests
 143          * from new peers, and that must be reflected in the beacon
 144          */
 145         free_plinks = mesh_plink_availables(sdata);
 146
 147         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 148                 sdata->u.mesh.accepting_plinks = free_plinks;
 149                 changed = BSS_CHANGED_BEACON;
 150         }
 151
 152         return changed;
 153 }
 154
 155 /*
 156  * mesh_sta_cleanup - clean up any mesh sta state
 157  *
 158  * @sta: mesh sta to clean up.
 159  */
 160 void mesh_sta_cleanup(struct sta_info *sta)
 161 {
 162         struct ieee80211_sub_if_data *sdata = sta->sdata;
 163         u32 changed = mesh_plink_deactivate(sta);
 164
 165         if (changed)
 166                 ieee80211_mbss_info_change_notify(sdata, changed);
 167 }
 168
 169 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 170 {
 171         int i;
 172
 173         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 174         if (!sdata->u.mesh.rmc)
 175                 return -ENOMEM;
 176         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 177         for (i = 0; i < RMC_BUCKETS; i++)
 178                 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 179         return 0;
 180 }
 181
 182 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 183 {
 184         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 185         struct rmc_entry *p;
 186         struct hlist_node *n;
 187         int i;
 188
 189         if (!sdata->u.mesh.rmc)
 190                 return;
 191
 192         for (i = 0; i < RMC_BUCKETS; i++) {
 193                 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 194                         hlist_del(&p->list);
 195                         kmem_cache_free(rm_cache, p);
 196                 }
 197         }
 198
 199         kfree(rmc);
 200         sdata->u.mesh.rmc = NULL;
 201 }
 202
 203 /**
 204  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 205  *
 206  * @sdata:      interface
 207  * @sa:         source address
 208  * @mesh_hdr:   mesh_header
 209  *
 210  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 211  *
 212  * Checks using the source address and the mesh sequence number if we have
 213  * received this frame lately. If the frame is not in the cache, it is added to
 214  * it.
 215  */
 216 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 217                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 218 {
 219         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 220         u32 seqnum = 0;
 221         int entries = 0;
 222         u8 idx;
 223         struct rmc_entry *p;
 224         struct hlist_node *n;
 225
 226         if (!rmc)
 227                 return -1;
 228
 229         /* Don't care about endianness since only match matters */
 230         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 231         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 232         hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 233                 ++entries;
 234                 if (time_after(jiffies, p->exp_time) ||
 235                     entries == RMC_QUEUE_MAX_LEN) {
 236                         hlist_del(&p->list);
 237                         kmem_cache_free(rm_cache, p);
 238                         --entries;
 239                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 240                         return -1;
 241         }
 242
 243         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 244         if (!p)
 245                 return 0;
 246
 247         p->seqnum = seqnum;
 248         p->exp_time = jiffies + RMC_TIMEOUT;
 249         memcpy(p->sa, sa, ETH_ALEN);
 250         hlist_add_head(&p->list, &rmc->bucket[idx]);
 251         return 0;
 252 }
 253
 254 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 255                          struct sk_buff *skb)
 256 {
 257         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 258         u8 *pos, neighbors;
 259         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 260         bool is_connected_to_gate = ifmsh->num_gates > 0 ||
 261                 ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
 262                 ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
 263
 264         if (skb_tailroom(skb) < 2 + meshconf_len)
 265                 return -ENOMEM;
 266
 267         pos = skb_put(skb, 2 + meshconf_len);
 268         *pos++ = WLAN_EID_MESH_CONFIG;
 269         *pos++ = meshconf_len;
 270
 271         /* save a pointer for quick updates in pre-tbtt */
 272         ifmsh->meshconf_offset = pos - skb->data;
 273
 274         /* Active path selection protocol ID */
 275         *pos++ = ifmsh->mesh_pp_id;
 276         /* Active path selection metric ID   */
 277         *pos++ = ifmsh->mesh_pm_id;
 278         /* Congestion control mode identifier */
 279         *pos++ = ifmsh->mesh_cc_id;
 280         /* Synchronization protocol identifier */
 281         *pos++ = ifmsh->mesh_sp_id;
 282         /* Authentication Protocol identifier */
 283         *pos++ = ifmsh->mesh_auth_id;
 284         /* Mesh Formation Info - number of neighbors */
 285         neighbors = atomic_read(&ifmsh->estab_plinks);
 286         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 287         *pos++ = (neighbors << 1) | is_connected_to_gate;
 288         /* Mesh capability */
 289         *pos = 0x00;
 290         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
 291                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
 292         *pos |= ifmsh->accepting_plinks ?
 293                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 294         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 295         *pos |= ifmsh->ps_peers_deep_sleep ?
 296                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 297         return 0;
 298 }
 299
 300 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 301 {
 302         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 303         u8 *pos;
 304
 305         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 306                 return -ENOMEM;
 307
 308         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 309         *pos++ = WLAN_EID_MESH_ID;
 310         *pos++ = ifmsh->mesh_id_len;
 311         if (ifmsh->mesh_id_len)
 312                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 313
 314         return 0;
 315 }
 316
 317 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 318                                     struct sk_buff *skb)
 319 {
 320         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 321         u8 *pos;
 322
 323         /* see IEEE802.11-2012 13.14.6 */
 324         if (ifmsh->ps_peers_light_sleep == 0 &&
 325             ifmsh->ps_peers_deep_sleep == 0 &&
 326             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 327                 return 0;
 328
 329         if (skb_tailroom(skb) < 4)
 330                 return -ENOMEM;
 331
 332         pos = skb_put(skb, 2 + 2);
 333         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 334         *pos++ = 2;
 335         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 336
 337         return 0;
 338 }
 339
 340 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 341                         struct sk_buff *skb)
 342 {
 343         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 344         u8 offset, len;
 345         const u8 *data;
 346
 347         if (!ifmsh->ie || !ifmsh->ie_len)
 348                 return 0;
 349
 350         /* fast-forward to vendor IEs */
 351         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 352
 353         if (offset < ifmsh->ie_len) {
 354                 len = ifmsh->ie_len - offset;
 355                 data = ifmsh->ie + offset;
 356                 if (skb_tailroom(skb) < len)
 357                         return -ENOMEM;
 358                 skb_put_data(skb, data, len);
 359         }
 360
 361         return 0;
 362 }
 363
 364 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 365 {
 366         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 367         u8 len = 0;
 368         const u8 *data;
 369
 370         if (!ifmsh->ie || !ifmsh->ie_len)
 371                 return 0;
 372
 373         /* find RSN IE */
 374         data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
 375         if (!data)
 376                 return 0;
 377
 378         len = data[1] + 2;
 379
 380         if (skb_tailroom(skb) < len)
 381                 return -ENOMEM;
 382         skb_put_data(skb, data, len);
 383
 384         return 0;
 385 }
 386
 387 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 388                                  struct sk_buff *skb)
 389 {
 390         struct ieee80211_chanctx_conf *chanctx_conf;
 391         struct ieee80211_channel *chan;
 392         u8 *pos;
 393
 394         if (skb_tailroom(skb) < 3)
 395                 return -ENOMEM;
 396
 397         rcu_read_lock();
 398         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 399         if (WARN_ON(!chanctx_conf)) {
 400                 rcu_read_unlock();
 401                 return -EINVAL;
 402         }
 403         chan = chanctx_conf->def.chan;
 404         rcu_read_unlock();
 405
 406         pos = skb_put(skb, 2 + 1);
 407         *pos++ = WLAN_EID_DS_PARAMS;
 408         *pos++ = 1;
 409         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 410
 411         return 0;
 412 }
 413
 414 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 415                        struct sk_buff *skb)
 416 {
 417         struct ieee80211_supported_band *sband;
 418         u8 *pos;
 419
 420         sband = ieee80211_get_sband(sdata);
 421         if (!sband)
 422                 return -EINVAL;
 423
 424         /* HT not allowed in 6 GHz */
 425         if (sband->band == NL80211_BAND_6GHZ)
 426                 return 0;
 427
 428         if (!sband->ht_cap.ht_supported ||
 429             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 430             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 431             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 432                 return 0;
 433
 434         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 435                 return -ENOMEM;
 436
 437         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 438         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 439
 440         return 0;
 441 }
 442
 443 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 444                         struct sk_buff *skb)
 445 {
 446         struct ieee80211_local *local = sdata->local;
 447         struct ieee80211_chanctx_conf *chanctx_conf;
 448         struct ieee80211_channel *channel;
 449         struct ieee80211_supported_band *sband;
 450         struct ieee80211_sta_ht_cap *ht_cap;
 451         u8 *pos;
 452
 453         rcu_read_lock();
 454         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 455         if (WARN_ON(!chanctx_conf)) {
 456                 rcu_read_unlock();
 457                 return -EINVAL;
 458         }
 459         channel = chanctx_conf->def.chan;
 460         rcu_read_unlock();
 461
 462         sband = local->hw.wiphy->bands[channel->band];
 463         ht_cap = &sband->ht_cap;
 464
 465         /* HT not allowed in 6 GHz */
 466         if (sband->band == NL80211_BAND_6GHZ)
 467                 return 0;
 468
 469         if (!ht_cap->ht_supported ||
 470             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 471             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 472             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 473                 return 0;
 474
 475         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 476                 return -ENOMEM;
 477
 478         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 479         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 480                                    sdata->vif.bss_conf.ht_operation_mode,
 481                                    false);
 482
 483         return 0;
 484 }
 485
 486 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
 487                         struct sk_buff *skb)
 488 {
 489         struct ieee80211_supported_band *sband;
 490         u8 *pos;
 491
 492         sband = ieee80211_get_sband(sdata);
 493         if (!sband)
 494                 return -EINVAL;
 495
 496         /* VHT not allowed in 6 GHz */
 497         if (sband->band == NL80211_BAND_6GHZ)
 498                 return 0;
 499
 500         if (!sband->vht_cap.vht_supported ||
 501             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 502             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 503             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 504                 return 0;
 505
 506         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
 507                 return -ENOMEM;
 508
 509         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
 510         ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 511
 512         return 0;
 513 }
 514
 515 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
 516                          struct sk_buff *skb)
 517 {
 518         struct ieee80211_local *local = sdata->local;
 519         struct ieee80211_chanctx_conf *chanctx_conf;
 520         struct ieee80211_channel *channel;
 521         struct ieee80211_supported_band *sband;
 522         struct ieee80211_sta_vht_cap *vht_cap;
 523         u8 *pos;
 524
 525         rcu_read_lock();
 526         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 527         if (WARN_ON(!chanctx_conf)) {
 528                 rcu_read_unlock();
 529                 return -EINVAL;
 530         }
 531         channel = chanctx_conf->def.chan;
 532         rcu_read_unlock();
 533
 534         sband = local->hw.wiphy->bands[channel->band];
 535         vht_cap = &sband->vht_cap;
 536
 537         /* VHT not allowed in 6 GHz */
 538         if (sband->band == NL80211_BAND_6GHZ)
 539                 return 0;
 540
 541         if (!vht_cap->vht_supported ||
 542             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 543             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 544             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 545                 return 0;
 546
 547         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
 548                 return -ENOMEM;
 549
 550         pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
 551         ieee80211_ie_build_vht_oper(pos, vht_cap,
 552                                     &sdata->vif.bss_conf.chandef);
 553
 554         return 0;
 555 }
 556
 557 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
 558                        struct sk_buff *skb, u8 ie_len)
 559 {
 560         const struct ieee80211_sta_he_cap *he_cap;
 561         struct ieee80211_supported_band *sband;
 562         u8 *pos;
 563
 564         sband = ieee80211_get_sband(sdata);
 565         if (!sband)
 566                 return -EINVAL;
 567
 568         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 569
 570         if (!he_cap ||
 571             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 572             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 573             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 574                 return 0;
 575
 576         if (skb_tailroom(skb) < ie_len)
 577                 return -ENOMEM;
 578
 579         pos = skb_put(skb, ie_len);
 580         ieee80211_ie_build_he_cap(pos, he_cap, pos + ie_len);
 581
 582         return 0;
 583 }
 584
 585 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
 586                         struct sk_buff *skb)
 587 {
 588         const struct ieee80211_sta_he_cap *he_cap;
 589         struct ieee80211_supported_band *sband;
 590         u32 len;
 591         u8 *pos;
 592
 593         sband = ieee80211_get_sband(sdata);
 594         if (!sband)
 595                 return -EINVAL;
 596
 597         he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 598         if (!he_cap ||
 599             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 600             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 601             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 602                 return 0;
 603
 604         len = 2 + 1 + sizeof(struct ieee80211_he_operation);
 605         if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ)
 606                 len += sizeof(struct ieee80211_he_6ghz_oper);
 607
 608         if (skb_tailroom(skb) < len)
 609                 return -ENOMEM;
 610
 611         pos = skb_put(skb, len);
 612         ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef);
 613
 614         return 0;
 615 }
 616
 617 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
 618                             struct sk_buff *skb)
 619 {
 620         ieee80211_ie_build_he_6ghz_cap(sdata, skb);
 621         return 0;
 622 }
 623
 624 static void ieee80211_mesh_path_timer(struct timer_list *t)
 625 {
 626         struct ieee80211_sub_if_data *sdata =
 627                 from_timer(sdata, t, u.mesh.mesh_path_timer);
 628
 629         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 630 }
 631
 632 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
 633 {
 634         struct ieee80211_sub_if_data *sdata =
 635                 from_timer(sdata, t, u.mesh.mesh_path_root_timer);
 636         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 637
 638         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 639
 640         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 641 }
 642
 643 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 644 {
 645         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 646                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 647         else {
 648                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 649                 /* stop running timer */
 650                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 651         }
 652 }
 653
 654 /**
 655  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 656  * @hdr:        802.11 frame header
 657  * @fc:         frame control field
 658  * @meshda:     destination address in the mesh
 659  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 660  *              locally originated.
 661  *
 662  * Return the length of the 802.11 (does not include a mesh control header)
 663  */
 664 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 665                                   const u8 *meshda, const u8 *meshsa)
 666 {
 667         if (is_multicast_ether_addr(meshda)) {
 668                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 669                 /* DA TA SA */
 670                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 671                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 672                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 673                 return 24;
 674         } else {
 675                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 676                 /* RA TA DA SA */
 677                 eth_zero_addr(hdr->addr1);   /* RA is resolved later */
 678                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 679                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 680                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 681                 return 30;
 682         }
 683 }
 684
 685 /**
 686  * ieee80211_new_mesh_header - create a new mesh header
 687  * @sdata:      mesh interface to be used
 688  * @meshhdr:    uninitialized mesh header
 689  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 690  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 691  *              be NULL.
 692  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 693  *              mesh frame
 694  *
 695  * Return the header length.
 696  */
 697 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 698                                        struct ieee80211s_hdr *meshhdr,
 699                                        const char *addr4or5, const char *addr6)
 700 {
 701         if (WARN_ON(!addr4or5 && addr6))
 702                 return 0;
 703
 704         memset(meshhdr, 0, sizeof(*meshhdr));
 705
 706         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 707
 708         /* FIXME: racy -- TX on multiple queues can be concurrent */
 709         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 710         sdata->u.mesh.mesh_seqnum++;
 711
 712         if (addr4or5 && !addr6) {
 713                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 714                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 715                 return 2 * ETH_ALEN;
 716         } else if (addr4or5 && addr6) {
 717                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 718                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 719                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 720                 return 3 * ETH_ALEN;
 721         }
 722
 723         return ETH_ALEN;
 724 }
 725
 726 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 727 {
 728         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 729         u32 changed;
 730
 731         if (ifmsh->mshcfg.plink_timeout > 0)
 732                 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 733         mesh_path_expire(sdata);
 734
 735         changed = mesh_accept_plinks_update(sdata);
 736         ieee80211_mbss_info_change_notify(sdata, changed);
 737
 738         mod_timer(&ifmsh->housekeeping_timer,
 739                   round_jiffies(jiffies +
 740                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 741 }
 742
 743 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 744 {
 745         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 746         u32 interval;
 747
 748         mesh_path_tx_root_frame(sdata);
 749
 750         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 751                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 752         else
 753                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 754
 755         mod_timer(&ifmsh->mesh_path_root_timer,
 756                   round_jiffies(TU_TO_EXP_TIME(interval)));
 757 }
 758
 759 static int
 760 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 761 {
 762         struct beacon_data *bcn;
 763         int head_len, tail_len;
 764         struct sk_buff *skb;
 765         struct ieee80211_mgmt *mgmt;
 766         struct ieee80211_chanctx_conf *chanctx_conf;
 767         struct mesh_csa_settings *csa;
 768         enum nl80211_band band;
 769         u8 ie_len_he_cap;
 770         u8 *pos;
 771         struct ieee80211_sub_if_data *sdata;
 772         int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
 773
 774         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 775         rcu_read_lock();
 776         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 777         band = chanctx_conf->def.chan->band;
 778         rcu_read_unlock();
 779
 780         ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
 781                                                 NL80211_IFTYPE_MESH_POINT);
 782         head_len = hdr_len +
 783                    2 + /* NULL SSID */
 784                    /* Channel Switch Announcement */
 785                    2 + sizeof(struct ieee80211_channel_sw_ie) +
 786                    /* Mesh Channel Switch Parameters */
 787                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 788                    /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
 789                    2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
 790                    2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
 791                    2 + 8 + /* supported rates */
 792                    2 + 3; /* DS params */
 793         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 794                    2 + sizeof(struct ieee80211_ht_cap) +
 795                    2 + sizeof(struct ieee80211_ht_operation) +
 796                    2 + ifmsh->mesh_id_len +
 797                    2 + sizeof(struct ieee80211_meshconf_ie) +
 798                    2 + sizeof(__le16) + /* awake window */
 799                    2 + sizeof(struct ieee80211_vht_cap) +
 800                    2 + sizeof(struct ieee80211_vht_operation) +
 801                    ie_len_he_cap +
 802                    2 + 1 + sizeof(struct ieee80211_he_operation) +
 803                            sizeof(struct ieee80211_he_6ghz_oper) +
 804                    2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
 805                    ifmsh->ie_len;
 806
 807         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 808         /* need an skb for IE builders to operate on */
 809         skb = dev_alloc_skb(max(head_len, tail_len));
 810
 811         if (!bcn || !skb)
 812                 goto out_free;
 813
 814         /*
 815          * pointers go into the block we allocated,
 816          * memory is | beacon_data | head | tail |
 817          */
 818         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 819
 820         /* fill in the head */
 821         mgmt = skb_put_zero(skb, hdr_len);
 822         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 823                                           IEEE80211_STYPE_BEACON);
 824         eth_broadcast_addr(mgmt->da);
 825         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 826         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 827         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 828         mgmt->u.beacon.beacon_int =
 829                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 830         mgmt->u.beacon.capab_info |= cpu_to_le16(
 831                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 832
 833         pos = skb_put(skb, 2);
 834         *pos++ = WLAN_EID_SSID;
 835         *pos++ = 0x0;
 836
 837         rcu_read_lock();
 838         csa = rcu_dereference(ifmsh->csa);
 839         if (csa) {
 840                 enum nl80211_channel_type ct;
 841                 struct cfg80211_chan_def *chandef;
 842                 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
 843                              2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
 844
 845                 pos = skb_put_zero(skb, ie_len);
 846                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 847                 *pos++ = 3;
 848                 *pos++ = 0x0;
 849                 *pos++ = ieee80211_frequency_to_channel(
 850                                 csa->settings.chandef.chan->center_freq);
 851                 bcn->csa_current_counter = csa->settings.count;
 852                 bcn->csa_counter_offsets[0] = hdr_len + 6;
 853                 *pos++ = csa->settings.count;
 854                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
 855                 *pos++ = 6;
 856                 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
 857                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
 858                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
 859                 } else {
 860                         *pos++ = ifmsh->chsw_ttl;
 861                 }
 862                 *pos++ |= csa->settings.block_tx ?
 863                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
 864                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
 865                 pos += 2;
 866                 put_unaligned_le16(ifmsh->pre_value, pos);
 867                 pos += 2;
 868
 869                 switch (csa->settings.chandef.width) {
 870                 case NL80211_CHAN_WIDTH_40:
 871                         ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
 872                         pos = skb_put_zero(skb, ie_len);
 873
 874                         *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
 875                         *pos++ = 1;                                 /* len */
 876                         ct = cfg80211_get_chandef_type(&csa->settings.chandef);
 877                         if (ct == NL80211_CHAN_HT40PLUS)
 878                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 879                         else
 880                                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 881                         break;
 882                 case NL80211_CHAN_WIDTH_80:
 883                 case NL80211_CHAN_WIDTH_80P80:
 884                 case NL80211_CHAN_WIDTH_160:
 885                         /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
 886                         ie_len = 2 + 2 +
 887                                  sizeof(struct ieee80211_wide_bw_chansw_ie);
 888                         pos = skb_put_zero(skb, ie_len);
 889
 890                         *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
 891                         *pos++ = 5;                               /* len */
 892                         /* put sub IE */
 893                         chandef = &csa->settings.chandef;
 894                         ieee80211_ie_build_wide_bw_cs(pos, chandef);
 895                         break;
 896                 default:
 897                         break;
 898                 }
 899         }
 900         rcu_read_unlock();
 901
 902         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 903             mesh_add_ds_params_ie(sdata, skb))
 904                 goto out_free;
 905
 906         bcn->head_len = skb->len;
 907         memcpy(bcn->head, skb->data, bcn->head_len);
 908
 909         /* now the tail */
 910         skb_trim(skb, 0);
 911         bcn->tail = bcn->head + bcn->head_len;
 912
 913         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 914             mesh_add_rsn_ie(sdata, skb) ||
 915             mesh_add_ht_cap_ie(sdata, skb) ||
 916             mesh_add_ht_oper_ie(sdata, skb) ||
 917             mesh_add_meshid_ie(sdata, skb) ||
 918             mesh_add_meshconf_ie(sdata, skb) ||
 919             mesh_add_awake_window_ie(sdata, skb) ||
 920             mesh_add_vht_cap_ie(sdata, skb) ||
 921             mesh_add_vht_oper_ie(sdata, skb) ||
 922             mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
 923             mesh_add_he_oper_ie(sdata, skb) ||
 924             mesh_add_he_6ghz_cap_ie(sdata, skb) ||
 925             mesh_add_vendor_ies(sdata, skb))
 926                 goto out_free;
 927
 928         bcn->tail_len = skb->len;
 929         memcpy(bcn->tail, skb->data, bcn->tail_len);
 930         bcn->meshconf = (struct ieee80211_meshconf_ie *)
 931                                         (bcn->tail + ifmsh->meshconf_offset);
 932
 933         dev_kfree_skb(skb);
 934         rcu_assign_pointer(ifmsh->beacon, bcn);
 935         return 0;
 936 out_free:
 937         kfree(bcn);
 938         dev_kfree_skb(skb);
 939         return -ENOMEM;
 940 }
 941
 942 static int
 943 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 944 {
 945         struct beacon_data *old_bcn;
 946         int ret;
 947
 948         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
 949                                             lockdep_is_held(&sdata->wdev.mtx));
 950         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 951         if (ret)
 952                 /* just reuse old beacon */
 953                 return ret;
 954
 955         if (old_bcn)
 956                 kfree_rcu(old_bcn, rcu_head);
 957         return 0;
 958 }
 959
 960 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 961                                        u32 changed)
 962 {
 963         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 964         unsigned long bits = changed;
 965         u32 bit;
 966
 967         if (!bits)
 968                 return;
 969
 970         /* if we race with running work, worst case this work becomes a noop */
 971         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
 972                 set_bit(bit, &ifmsh->mbss_changed);
 973         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
 974         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 975 }
 976
 977 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 978 {
 979         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 980         struct ieee80211_local *local = sdata->local;
 981         u32 changed = BSS_CHANGED_BEACON |
 982                       BSS_CHANGED_BEACON_ENABLED |
 983                       BSS_CHANGED_HT |
 984                       BSS_CHANGED_BASIC_RATES |
 985                       BSS_CHANGED_BEACON_INT |
 986                       BSS_CHANGED_MCAST_RATE;
 987
 988         local->fif_other_bss++;
 989         /* mesh ifaces must set allmulti to forward mcast traffic */
 990         atomic_inc(&local->iff_allmultis);
 991         ieee80211_configure_filter(local);
 992
 993         ifmsh->mesh_cc_id = 0;  /* Disabled */
 994         /* register sync ops from extensible synchronization framework */
 995         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 996         ifmsh->sync_offset_clockdrift_max = 0;
 997         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 998         ieee80211_mesh_root_setup(ifmsh);
 999         ieee80211_queue_work(&local->hw, &sdata->work);
1000         sdata->vif.bss_conf.ht_operation_mode =
1001                                 ifmsh->mshcfg.ht_opmode;
1002         sdata->vif.bss_conf.enable_beacon = true;
1003
1004         changed |= ieee80211_mps_local_status_update(sdata);
1005
1006         if (ieee80211_mesh_build_beacon(ifmsh)) {
1007                 ieee80211_stop_mesh(sdata);
1008                 return -ENOMEM;
1009         }
1010
1011         ieee80211_recalc_dtim(local, sdata);
1012         ieee80211_bss_info_change_notify(sdata, changed);
1013
1014         netif_carrier_on(sdata->dev);
1015         return 0;
1016 }
1017
1018 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
1019 {
1020         struct ieee80211_local *local = sdata->local;
1021         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1022         struct beacon_data *bcn;
1023
1024         netif_carrier_off(sdata->dev);
1025
1026         /* flush STAs and mpaths on this iface */
1027         sta_info_flush(sdata);
1028         ieee80211_free_keys(sdata, true);
1029         mesh_path_flush_by_iface(sdata);
1030
1031         /* stop the beacon */
1032         ifmsh->mesh_id_len = 0;
1033         sdata->vif.bss_conf.enable_beacon = false;
1034         sdata->beacon_rate_set = false;
1035         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
1036         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
1037
1038         /* remove beacon */
1039         bcn = rcu_dereference_protected(ifmsh->beacon,
1040                                         lockdep_is_held(&sdata->wdev.mtx));
1041         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1042         kfree_rcu(bcn, rcu_head);
1043
1044         /* free all potentially still buffered group-addressed frames */
1045         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
1046         skb_queue_purge(&ifmsh->ps.bc_buf);
1047
1048         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
1049         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
1050         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
1051
1052         /* clear any mesh work (for next join) we may have accrued */
1053         ifmsh->wrkq_flags = 0;
1054         ifmsh->mbss_changed = 0;
1055
1056         local->fif_other_bss--;
1057         atomic_dec(&local->iff_allmultis);
1058         ieee80211_configure_filter(local);
1059 }
1060
1061 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
1062 {
1063         int err;
1064
1065         /* if the current channel is a DFS channel, mark the channel as
1066          * unavailable.
1067          */
1068         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1069                                             &sdata->vif.bss_conf.chandef,
1070                                             NL80211_IFTYPE_MESH_POINT);
1071         if (err > 0)
1072                 cfg80211_radar_event(sdata->local->hw.wiphy,
1073                                      &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
1074 }
1075
1076 static bool
1077 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
1078                                  struct ieee802_11_elems *elems, bool beacon)
1079 {
1080         struct cfg80211_csa_settings params;
1081         struct ieee80211_csa_ie csa_ie;
1082         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1083         struct ieee80211_supported_band *sband;
1084         int err;
1085         u32 sta_flags, vht_cap_info = 0;
1086
1087         sdata_assert_lock(sdata);
1088
1089         sband = ieee80211_get_sband(sdata);
1090         if (!sband)
1091                 return false;
1092
1093         sta_flags = 0;
1094         switch (sdata->vif.bss_conf.chandef.width) {
1095         case NL80211_CHAN_WIDTH_20_NOHT:
1096                 sta_flags |= IEEE80211_STA_DISABLE_HT;
1097                 /* fall through */
1098         case NL80211_CHAN_WIDTH_20:
1099                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
1100                 /* fall through */
1101         case NL80211_CHAN_WIDTH_40:
1102                 sta_flags |= IEEE80211_STA_DISABLE_VHT;
1103                 break;
1104         default:
1105                 break;
1106         }
1107
1108         if (elems->vht_cap_elem)
1109                 vht_cap_info =
1110                         le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
1111
1112         memset(&params, 0, sizeof(params));
1113         err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
1114                                            vht_cap_info,
1115                                            sta_flags, sdata->vif.addr,
1116                                            &csa_ie);
1117         if (err < 0)
1118                 return false;
1119         if (err)
1120                 return false;
1121
1122         /* Mark the channel unavailable if the reason for the switch is
1123          * regulatory.
1124          */
1125         if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1126                 ieee80211_mesh_csa_mark_radar(sdata);
1127
1128         params.chandef = csa_ie.chandef;
1129         params.count = csa_ie.count;
1130
1131         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
1132                                      IEEE80211_CHAN_DISABLED) ||
1133             !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1134                                      NL80211_IFTYPE_MESH_POINT)) {
1135                 sdata_info(sdata,
1136                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1137                            sdata->vif.addr,
1138                            params.chandef.chan->center_freq,
1139                            params.chandef.width,
1140                            params.chandef.center_freq1,
1141                            params.chandef.center_freq2);
1142                 return false;
1143         }
1144
1145         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
1146                                             &params.chandef,
1147                                             NL80211_IFTYPE_MESH_POINT);
1148         if (err < 0)
1149                 return false;
1150         if (err > 0 && !ifmsh->userspace_handles_dfs) {
1151                 sdata_info(sdata,
1152                            "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1153                            sdata->vif.addr,
1154                            params.chandef.chan->center_freq,
1155                            params.chandef.width,
1156                            params.chandef.center_freq1,
1157                            params.chandef.center_freq2);
1158                 return false;
1159         }
1160
1161         params.radar_required = err;
1162
1163         if (cfg80211_chandef_identical(&params.chandef,
1164                                        &sdata->vif.bss_conf.chandef)) {
1165                 mcsa_dbg(sdata,
1166                          "received csa with an identical chandef, ignoring\n");
1167                 return true;
1168         }
1169
1170         mcsa_dbg(sdata,
1171                  "received channel switch announcement to go to channel %d MHz\n",
1172                  params.chandef.chan->center_freq);
1173
1174         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
1175         if (beacon) {
1176                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
1177                 if (ifmsh->pre_value >= csa_ie.pre_value)
1178                         return false;
1179                 ifmsh->pre_value = csa_ie.pre_value;
1180         }
1181
1182         if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
1183                 return false;
1184
1185         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
1186
1187         if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1188                                      &params) < 0)
1189                 return false;
1190
1191         return true;
1192 }
1193
1194 static void
1195 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1196                             struct ieee80211_mgmt *mgmt, size_t len)
1197 {
1198         struct ieee80211_local *local = sdata->local;
1199         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1200         struct sk_buff *presp;
1201         struct beacon_data *bcn;
1202         struct ieee80211_mgmt *hdr;
1203         struct ieee802_11_elems elems;
1204         size_t baselen;
1205         u8 *pos;
1206
1207         pos = mgmt->u.probe_req.variable;
1208         baselen = (u8 *) pos - (u8 *) mgmt;
1209         if (baselen > len)
1210                 return;
1211
1212         ieee802_11_parse_elems(pos, len - baselen, false, &elems, mgmt->bssid,
1213                                NULL);
1214
1215         if (!elems.mesh_id)
1216                 return;
1217
1218         /* 802.11-2012 10.1.4.3.2 */
1219         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1220              !is_broadcast_ether_addr(mgmt->da)) ||
1221             elems.ssid_len != 0)
1222                 return;
1223
1224         if (elems.mesh_id_len != 0 &&
1225             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1226              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1227                 return;
1228
1229         rcu_read_lock();
1230         bcn = rcu_dereference(ifmsh->beacon);
1231
1232         if (!bcn)
1233                 goto out;
1234
1235         presp = dev_alloc_skb(local->tx_headroom +
1236                               bcn->head_len + bcn->tail_len);
1237         if (!presp)
1238                 goto out;
1239
1240         skb_reserve(presp, local->tx_headroom);
1241         skb_put_data(presp, bcn->head, bcn->head_len);
1242         skb_put_data(presp, bcn->tail, bcn->tail_len);
1243         hdr = (struct ieee80211_mgmt *) presp->data;
1244         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1245                                          IEEE80211_STYPE_PROBE_RESP);
1246         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1247         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1248         ieee80211_tx_skb(sdata, presp);
1249 out:
1250         rcu_read_unlock();
1251 }
1252
1253 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1254                                         u16 stype,
1255                                         struct ieee80211_mgmt *mgmt,
1256                                         size_t len,
1257                                         struct ieee80211_rx_status *rx_status)
1258 {
1259         struct ieee80211_local *local = sdata->local;
1260         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1261         struct ieee802_11_elems elems;
1262         struct ieee80211_channel *channel;
1263         size_t baselen;
1264         int freq;
1265         enum nl80211_band band = rx_status->band;
1266
1267         /* ignore ProbeResp to foreign address */
1268         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1269             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1270                 return;
1271
1272         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1273         if (baselen > len)
1274                 return;
1275
1276         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1277                                false, &elems, mgmt->bssid, NULL);
1278
1279         /* ignore non-mesh or secure / unsecure mismatch */
1280         if ((!elems.mesh_id || !elems.mesh_config) ||
1281             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1282             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1283                 return;
1284
1285         if (elems.ds_params)
1286                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1287         else
1288                 freq = rx_status->freq;
1289
1290         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1291
1292         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1293                 return;
1294
1295         if (mesh_matches_local(sdata, &elems)) {
1296                 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1297                         sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1298                 if (!sdata->u.mesh.user_mpm ||
1299                     sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1300                     sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1301                         mesh_neighbour_update(sdata, mgmt->sa, &elems,
1302                                               rx_status);
1303
1304                 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1305                     !sdata->vif.csa_active)
1306                         ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1307         }
1308
1309         if (ifmsh->sync_ops)
1310                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1311                         stype, mgmt, &elems, rx_status);
1312 }
1313
1314 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1315 {
1316         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1317         struct mesh_csa_settings *tmp_csa_settings;
1318         int ret = 0;
1319         int changed = 0;
1320
1321         /* Reset the TTL value and Initiator flag */
1322         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1323         ifmsh->chsw_ttl = 0;
1324
1325         /* Remove the CSA and MCSP elements from the beacon */
1326         tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
1327                                             lockdep_is_held(&sdata->wdev.mtx));
1328         RCU_INIT_POINTER(ifmsh->csa, NULL);
1329         if (tmp_csa_settings)
1330                 kfree_rcu(tmp_csa_settings, rcu_head);
1331         ret = ieee80211_mesh_rebuild_beacon(sdata);
1332         if (ret)
1333                 return -EINVAL;
1334
1335         changed |= BSS_CHANGED_BEACON;
1336
1337         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1338                  sdata->vif.bss_conf.chandef.chan->center_freq);
1339         return changed;
1340 }
1341
1342 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1343                               struct cfg80211_csa_settings *csa_settings)
1344 {
1345         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1346         struct mesh_csa_settings *tmp_csa_settings;
1347         int ret = 0;
1348
1349         lockdep_assert_held(&sdata->wdev.mtx);
1350
1351         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1352                                    GFP_ATOMIC);
1353         if (!tmp_csa_settings)
1354                 return -ENOMEM;
1355
1356         memcpy(&tmp_csa_settings->settings, csa_settings,
1357                sizeof(struct cfg80211_csa_settings));
1358
1359         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1360
1361         ret = ieee80211_mesh_rebuild_beacon(sdata);
1362         if (ret) {
1363                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1364                 RCU_INIT_POINTER(ifmsh->csa, NULL);
1365                 kfree_rcu(tmp_csa_settings, rcu_head);
1366                 return ret;
1367         }
1368
1369         return BSS_CHANGED_BEACON;
1370 }
1371
1372 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1373                                struct ieee80211_mgmt *mgmt, size_t len,
1374                                struct ieee802_11_elems *elems)
1375 {
1376         struct ieee80211_mgmt *mgmt_fwd;
1377         struct sk_buff *skb;
1378         struct ieee80211_local *local = sdata->local;
1379
1380         skb = dev_alloc_skb(local->tx_headroom + len);
1381         if (!skb)
1382                 return -ENOMEM;
1383         skb_reserve(skb, local->tx_headroom);
1384         mgmt_fwd = skb_put(skb, len);
1385
1386         elems->mesh_chansw_params_ie->mesh_ttl--;
1387         elems->mesh_chansw_params_ie->mesh_flags &=
1388                 ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1389
1390         memcpy(mgmt_fwd, mgmt, len);
1391         eth_broadcast_addr(mgmt_fwd->da);
1392         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1393         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1394
1395         ieee80211_tx_skb(sdata, skb);
1396         return 0;
1397 }
1398
1399 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1400                               struct ieee80211_mgmt *mgmt, size_t len)
1401 {
1402         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1403         struct ieee802_11_elems elems;
1404         u16 pre_value;
1405         bool fwd_csa = true;
1406         size_t baselen;
1407         u8 *pos;
1408
1409         if (mgmt->u.action.u.measurement.action_code !=
1410             WLAN_ACTION_SPCT_CHL_SWITCH)
1411                 return;
1412
1413         pos = mgmt->u.action.u.chan_switch.variable;
1414         baselen = offsetof(struct ieee80211_mgmt,
1415                            u.action.u.chan_switch.variable);
1416         ieee802_11_parse_elems(pos, len - baselen, true, &elems,
1417                                mgmt->bssid, NULL);
1418
1419         if (!mesh_matches_local(sdata, &elems))
1420                 return;
1421
1422         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1423         if (!--ifmsh->chsw_ttl)
1424                 fwd_csa = false;
1425
1426         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1427         if (ifmsh->pre_value >= pre_value)
1428                 return;
1429
1430         ifmsh->pre_value = pre_value;
1431
1432         if (!sdata->vif.csa_active &&
1433             !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1434                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1435                 return;
1436         }
1437
1438         /* forward or re-broadcast the CSA frame */
1439         if (fwd_csa) {
1440                 if (mesh_fwd_csa_frame(sdata, mgmt, len, &elems) < 0)
1441                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1442         }
1443 }
1444
1445 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1446                                           struct ieee80211_mgmt *mgmt,
1447                                           size_t len,
1448                                           struct ieee80211_rx_status *rx_status)
1449 {
1450         switch (mgmt->u.action.category) {
1451         case WLAN_CATEGORY_SELF_PROTECTED:
1452                 switch (mgmt->u.action.u.self_prot.action_code) {
1453                 case WLAN_SP_MESH_PEERING_OPEN:
1454                 case WLAN_SP_MESH_PEERING_CLOSE:
1455                 case WLAN_SP_MESH_PEERING_CONFIRM:
1456                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1457                         break;
1458                 }
1459                 break;
1460         case WLAN_CATEGORY_MESH_ACTION:
1461                 if (mesh_action_is_path_sel(mgmt))
1462                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1463                 break;
1464         case WLAN_CATEGORY_SPECTRUM_MGMT:
1465                 mesh_rx_csa_frame(sdata, mgmt, len);
1466                 break;
1467         }
1468 }
1469
1470 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1471                                    struct sk_buff *skb)
1472 {
1473         struct ieee80211_rx_status *rx_status;
1474         struct ieee80211_mgmt *mgmt;
1475         u16 stype;
1476
1477         sdata_lock(sdata);
1478
1479         /* mesh already went down */
1480         if (!sdata->u.mesh.mesh_id_len)
1481                 goto out;
1482
1483         rx_status = IEEE80211_SKB_RXCB(skb);
1484         mgmt = (struct ieee80211_mgmt *) skb->data;
1485         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1486
1487         switch (stype) {
1488         case IEEE80211_STYPE_PROBE_RESP:
1489         case IEEE80211_STYPE_BEACON:
1490                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1491                                             rx_status);
1492                 break;
1493         case IEEE80211_STYPE_PROBE_REQ:
1494                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1495                 break;
1496         case IEEE80211_STYPE_ACTION:
1497                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1498                 break;
1499         }
1500 out:
1501         sdata_unlock(sdata);
1502 }
1503
1504 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1505 {
1506         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1507         u32 bit, changed = 0;
1508
1509         for_each_set_bit(bit, &ifmsh->mbss_changed,
1510                          sizeof(changed) * BITS_PER_BYTE) {
1511                 clear_bit(bit, &ifmsh->mbss_changed);
1512                 changed |= BIT(bit);
1513         }
1514
1515         if (sdata->vif.bss_conf.enable_beacon &&
1516             (changed & (BSS_CHANGED_BEACON |
1517                         BSS_CHANGED_HT |
1518                         BSS_CHANGED_BASIC_RATES |
1519                         BSS_CHANGED_BEACON_INT)))
1520                 if (ieee80211_mesh_rebuild_beacon(sdata))
1521                         return;
1522
1523         ieee80211_bss_info_change_notify(sdata, changed);
1524 }
1525
1526 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1527 {
1528         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1529
1530         sdata_lock(sdata);
1531
1532         /* mesh already went down */
1533         if (!sdata->u.mesh.mesh_id_len)
1534                 goto out;
1535
1536         if (ifmsh->preq_queue_len &&
1537             time_after(jiffies,
1538                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1539                 mesh_path_start_discovery(sdata);
1540
1541         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1542                 ieee80211_mesh_housekeeping(sdata);
1543
1544         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1545                 ieee80211_mesh_rootpath(sdata);
1546
1547         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1548                 mesh_sync_adjust_tsf(sdata);
1549
1550         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1551                 mesh_bss_info_changed(sdata);
1552 out:
1553         sdata_unlock(sdata);
1554 }
1555
1556
1557 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1558 {
1559         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1560         static u8 zero_addr[ETH_ALEN] = {};
1561
1562         timer_setup(&ifmsh->housekeeping_timer,
1563                     ieee80211_mesh_housekeeping_timer, 0);
1564
1565         ifmsh->accepting_plinks = true;
1566         atomic_set(&ifmsh->mpaths, 0);
1567         mesh_rmc_init(sdata);
1568         ifmsh->last_preq = jiffies;
1569         ifmsh->next_perr = jiffies;
1570         ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
1571         /* Allocate all mesh structures when creating the first mesh interface. */
1572         if (!mesh_allocated)
1573                 ieee80211s_init();
1574
1575         mesh_pathtbl_init(sdata);
1576
1577         timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
1578         timer_setup(&ifmsh->mesh_path_root_timer,
1579                     ieee80211_mesh_path_root_timer, 0);
1580         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1581         skb_queue_head_init(&ifmsh->ps.bc_buf);
1582         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1583         spin_lock_init(&ifmsh->sync_offset_lock);
1584         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1585
1586         sdata->vif.bss_conf.bssid = zero_addr;
1587 }
1588
1589 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1590 {
1591         mesh_rmc_free(sdata);
1592         mesh_pathtbl_unregister(sdata);
1593 }