net/mac80211/mesh.c

   1 /*
   2  * Copyright (c) 2008, 2009 open80211s Ltd.
   3  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
   4  *             Javier Cardona <javier@cozybit.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/slab.h>
  12 #include <asm/unaligned.h>
  13 #include "ieee80211_i.h"
  14 #include "mesh.h"
  15 #include "driver-ops.h"
  16
  17 static int mesh_allocated;
  18 static struct kmem_cache *rm_cache;
  19
  20 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  21 {
  22         return (mgmt->u.action.u.mesh_action.action_code ==
  23                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  24 }
  25
  26 void ieee80211s_init(void)
  27 {
  28         mesh_pathtbl_init();
  29         mesh_allocated = 1;
  30         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  31                                      0, 0, NULL);
  32 }
  33
  34 void ieee80211s_stop(void)
  35 {
  36         if (!mesh_allocated)
  37                 return;
  38         mesh_pathtbl_unregister();
  39         kmem_cache_destroy(rm_cache);
  40 }
  41
  42 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  43 {
  44         struct ieee80211_sub_if_data *sdata = (void *) data;
  45         struct ieee80211_local *local = sdata->local;
  46         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  47
  48         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  49
  50         ieee80211_queue_work(&local->hw, &sdata->work);
  51 }
  52
  53 /**
  54  * mesh_matches_local - check if the config of a mesh point matches ours
  55  *
  56  * @sdata: local mesh subif
  57  * @ie: information elements of a management frame from the mesh peer
  58  *
  59  * This function checks if the mesh configuration of a mesh point matches the
  60  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  61  */
  62 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  63                         struct ieee802_11_elems *ie)
  64 {
  65         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  66         u32 basic_rates = 0;
  67         struct cfg80211_chan_def sta_chan_def;
  68
  69         /*
  70          * As support for each feature is added, check for matching
  71          * - On mesh config capabilities
  72          *   - Power Save Support En
  73          *   - Sync support enabled
  74          *   - Sync support active
  75          *   - Sync support required from peer
  76          *   - MDA enabled
  77          * - Power management control on fc
  78          */
  79         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  80              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  81              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  82              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  83              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  84              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  85              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  86                 return false;
  87
  88         ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata),
  89                                 &basic_rates);
  90
  91         if (sdata->vif.bss_conf.basic_rates != basic_rates)
  92                 return false;
  93
  94         ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
  95                                      ie->ht_operation, &sta_chan_def);
  96
  97         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
  98                                          &sta_chan_def))
  99                 return false;
 100
 101         return true;
 102 }
 103
 104 /**
 105  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 106  *
 107  * @ie: information elements of a management frame from the mesh peer
 108  */
 109 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 110 {
 111         return (ie->mesh_config->meshconf_cap &
 112                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 113 }
 114
 115 /**
 116  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 117  *
 118  * @sdata: mesh interface in which mesh beacons are going to be updated
 119  *
 120  * Returns: beacon changed flag if the beacon content changed.
 121  */
 122 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 123 {
 124         bool free_plinks;
 125         u32 changed = 0;
 126
 127         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 128          * the mesh interface might be able to establish plinks with peers that
 129          * are already on the table but are not on PLINK_ESTAB state. However,
 130          * in general the mesh interface is not accepting peer link requests
 131          * from new peers, and that must be reflected in the beacon
 132          */
 133         free_plinks = mesh_plink_availables(sdata);
 134
 135         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 136                 sdata->u.mesh.accepting_plinks = free_plinks;
 137                 changed = BSS_CHANGED_BEACON;
 138         }
 139
 140         return changed;
 141 }
 142
 143 /*
 144  * mesh_sta_cleanup - clean up any mesh sta state
 145  *
 146  * @sta: mesh sta to clean up.
 147  */
 148 void mesh_sta_cleanup(struct sta_info *sta)
 149 {
 150         struct ieee80211_sub_if_data *sdata = sta->sdata;
 151         u32 changed;
 152
 153         /*
 154          * maybe userspace handles peer allocation and peering, but in either
 155          * case the beacon is still generated by the kernel and we might need
 156          * an update.
 157          */
 158         changed = mesh_accept_plinks_update(sdata);
 159         if (!sdata->u.mesh.user_mpm) {
 160                 changed |= mesh_plink_deactivate(sta);
 161                 del_timer_sync(&sta->plink_timer);
 162         }
 163
 164         if (changed)
 165                 ieee80211_mbss_info_change_notify(sdata, changed);
 166 }
 167
 168 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 169 {
 170         int i;
 171
 172         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 173         if (!sdata->u.mesh.rmc)
 174                 return -ENOMEM;
 175         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 176         for (i = 0; i < RMC_BUCKETS; i++)
 177                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 178         return 0;
 179 }
 180
 181 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 182 {
 183         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 184         struct rmc_entry *p, *n;
 185         int i;
 186
 187         if (!sdata->u.mesh.rmc)
 188                 return;
 189
 190         for (i = 0; i < RMC_BUCKETS; i++) {
 191                 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 192                         list_del(&p->list);
 193                         kmem_cache_free(rm_cache, p);
 194                 }
 195         }
 196
 197         kfree(rmc);
 198         sdata->u.mesh.rmc = NULL;
 199 }
 200
 201 /**
 202  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 203  *
 204  * @sdata:      interface
 205  * @sa:         source address
 206  * @mesh_hdr:   mesh_header
 207  *
 208  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 209  *
 210  * Checks using the source address and the mesh sequence number if we have
 211  * received this frame lately. If the frame is not in the cache, it is added to
 212  * it.
 213  */
 214 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 215                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 216 {
 217         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 218         u32 seqnum = 0;
 219         int entries = 0;
 220         u8 idx;
 221         struct rmc_entry *p, *n;
 222
 223         /* Don't care about endianness since only match matters */
 224         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 225         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 226         list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 227                 ++entries;
 228                 if (time_after(jiffies, p->exp_time) ||
 229                     entries == RMC_QUEUE_MAX_LEN) {
 230                         list_del(&p->list);
 231                         kmem_cache_free(rm_cache, p);
 232                         --entries;
 233                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 234                         return -1;
 235         }
 236
 237         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 238         if (!p)
 239                 return 0;
 240
 241         p->seqnum = seqnum;
 242         p->exp_time = jiffies + RMC_TIMEOUT;
 243         memcpy(p->sa, sa, ETH_ALEN);
 244         list_add(&p->list, &rmc->bucket[idx]);
 245         return 0;
 246 }
 247
 248 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 249                          struct sk_buff *skb)
 250 {
 251         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 252         u8 *pos, neighbors;
 253         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 254
 255         if (skb_tailroom(skb) < 2 + meshconf_len)
 256                 return -ENOMEM;
 257
 258         pos = skb_put(skb, 2 + meshconf_len);
 259         *pos++ = WLAN_EID_MESH_CONFIG;
 260         *pos++ = meshconf_len;
 261
 262         /* save a pointer for quick updates in pre-tbtt */
 263         ifmsh->meshconf_offset = pos - skb->data;
 264
 265         /* Active path selection protocol ID */
 266         *pos++ = ifmsh->mesh_pp_id;
 267         /* Active path selection metric ID   */
 268         *pos++ = ifmsh->mesh_pm_id;
 269         /* Congestion control mode identifier */
 270         *pos++ = ifmsh->mesh_cc_id;
 271         /* Synchronization protocol identifier */
 272         *pos++ = ifmsh->mesh_sp_id;
 273         /* Authentication Protocol identifier */
 274         *pos++ = ifmsh->mesh_auth_id;
 275         /* Mesh Formation Info - number of neighbors */
 276         neighbors = atomic_read(&ifmsh->estab_plinks);
 277         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 278         *pos++ = neighbors << 1;
 279         /* Mesh capability */
 280         *pos = 0x00;
 281         *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
 282                         IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
 283         *pos |= ifmsh->accepting_plinks ?
 284                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 285         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 286         *pos |= ifmsh->ps_peers_deep_sleep ?
 287                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 288         *pos++ |= ifmsh->adjusting_tbtt ?
 289                         IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 290         *pos++ = 0x00;
 291
 292         return 0;
 293 }
 294
 295 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 296 {
 297         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 298         u8 *pos;
 299
 300         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 301                 return -ENOMEM;
 302
 303         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 304         *pos++ = WLAN_EID_MESH_ID;
 305         *pos++ = ifmsh->mesh_id_len;
 306         if (ifmsh->mesh_id_len)
 307                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 308
 309         return 0;
 310 }
 311
 312 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 313                                     struct sk_buff *skb)
 314 {
 315         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 316         u8 *pos;
 317
 318         /* see IEEE802.11-2012 13.14.6 */
 319         if (ifmsh->ps_peers_light_sleep == 0 &&
 320             ifmsh->ps_peers_deep_sleep == 0 &&
 321             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 322                 return 0;
 323
 324         if (skb_tailroom(skb) < 4)
 325                 return -ENOMEM;
 326
 327         pos = skb_put(skb, 2 + 2);
 328         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 329         *pos++ = 2;
 330         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 331
 332         return 0;
 333 }
 334
 335 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 336                         struct sk_buff *skb)
 337 {
 338         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 339         u8 offset, len;
 340         const u8 *data;
 341
 342         if (!ifmsh->ie || !ifmsh->ie_len)
 343                 return 0;
 344
 345         /* fast-forward to vendor IEs */
 346         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 347
 348         if (offset) {
 349                 len = ifmsh->ie_len - offset;
 350                 data = ifmsh->ie + offset;
 351                 if (skb_tailroom(skb) < len)
 352                         return -ENOMEM;
 353                 memcpy(skb_put(skb, len), data, len);
 354         }
 355
 356         return 0;
 357 }
 358
 359 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 360 {
 361         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 362         u8 len = 0;
 363         const u8 *data;
 364
 365         if (!ifmsh->ie || !ifmsh->ie_len)
 366                 return 0;
 367
 368         /* find RSN IE */
 369         data = ifmsh->ie;
 370         while (data < ifmsh->ie + ifmsh->ie_len) {
 371                 if (*data == WLAN_EID_RSN) {
 372                         len = data[1] + 2;
 373                         break;
 374                 }
 375                 data++;
 376         }
 377
 378         if (len) {
 379                 if (skb_tailroom(skb) < len)
 380                         return -ENOMEM;
 381                 memcpy(skb_put(skb, len), data, len);
 382         }
 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_local *local = sdata->local;
 418         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 419         struct ieee80211_supported_band *sband;
 420         u8 *pos;
 421
 422         sband = local->hw.wiphy->bands[band];
 423         if (!sband->ht_cap.ht_supported ||
 424             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 425             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 426             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 427                 return 0;
 428
 429         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 430                 return -ENOMEM;
 431
 432         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 433         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 434
 435         return 0;
 436 }
 437
 438 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 439                         struct sk_buff *skb)
 440 {
 441         struct ieee80211_local *local = sdata->local;
 442         struct ieee80211_chanctx_conf *chanctx_conf;
 443         struct ieee80211_channel *channel;
 444         enum nl80211_channel_type channel_type =
 445                 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
 446         struct ieee80211_supported_band *sband;
 447         struct ieee80211_sta_ht_cap *ht_cap;
 448         u8 *pos;
 449
 450         rcu_read_lock();
 451         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 452         if (WARN_ON(!chanctx_conf)) {
 453                 rcu_read_unlock();
 454                 return -EINVAL;
 455         }
 456         channel = chanctx_conf->def.chan;
 457         rcu_read_unlock();
 458
 459         sband = local->hw.wiphy->bands[channel->band];
 460         ht_cap = &sband->ht_cap;
 461
 462         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 463                 return 0;
 464
 465         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 466                 return -ENOMEM;
 467
 468         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 469         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 470                                    sdata->vif.bss_conf.ht_operation_mode);
 471
 472         return 0;
 473 }
 474
 475 static void ieee80211_mesh_path_timer(unsigned long data)
 476 {
 477         struct ieee80211_sub_if_data *sdata =
 478                 (struct ieee80211_sub_if_data *) data;
 479
 480         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 481 }
 482
 483 static void ieee80211_mesh_path_root_timer(unsigned long data)
 484 {
 485         struct ieee80211_sub_if_data *sdata =
 486                 (struct ieee80211_sub_if_data *) data;
 487         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 488
 489         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 490
 491         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 492 }
 493
 494 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 495 {
 496         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 497                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 498         else {
 499                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 500                 /* stop running timer */
 501                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 502         }
 503 }
 504
 505 /**
 506  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 507  * @hdr:        802.11 frame header
 508  * @fc:         frame control field
 509  * @meshda:     destination address in the mesh
 510  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 511  *              locally originated.
 512  *
 513  * Return the length of the 802.11 (does not include a mesh control header)
 514  */
 515 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 516                                   const u8 *meshda, const u8 *meshsa)
 517 {
 518         if (is_multicast_ether_addr(meshda)) {
 519                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 520                 /* DA TA SA */
 521                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 522                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 523                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 524                 return 24;
 525         } else {
 526                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 527                 /* RA TA DA SA */
 528                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 529                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 530                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 531                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 532                 return 30;
 533         }
 534 }
 535
 536 /**
 537  * ieee80211_new_mesh_header - create a new mesh header
 538  * @sdata:      mesh interface to be used
 539  * @meshhdr:    uninitialized mesh header
 540  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 541  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 542  *              be NULL.
 543  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 544  *              mesh frame
 545  *
 546  * Return the header length.
 547  */
 548 int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 549                               struct ieee80211s_hdr *meshhdr,
 550                               const char *addr4or5, const char *addr6)
 551 {
 552         if (WARN_ON(!addr4or5 && addr6))
 553                 return 0;
 554
 555         memset(meshhdr, 0, sizeof(*meshhdr));
 556
 557         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 558
 559         /* FIXME: racy -- TX on multiple queues can be concurrent */
 560         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 561         sdata->u.mesh.mesh_seqnum++;
 562
 563         if (addr4or5 && !addr6) {
 564                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 565                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 566                 return 2 * ETH_ALEN;
 567         } else if (addr4or5 && addr6) {
 568                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 569                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 570                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 571                 return 3 * ETH_ALEN;
 572         }
 573
 574         return ETH_ALEN;
 575 }
 576
 577 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 578 {
 579         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 580         u32 changed;
 581
 582         ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 583         mesh_path_expire(sdata);
 584
 585         changed = mesh_accept_plinks_update(sdata);
 586         ieee80211_mbss_info_change_notify(sdata, changed);
 587
 588         mod_timer(&ifmsh->housekeeping_timer,
 589                   round_jiffies(jiffies +
 590                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 591 }
 592
 593 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 594 {
 595         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 596         u32 interval;
 597
 598         mesh_path_tx_root_frame(sdata);
 599
 600         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 601                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 602         else
 603                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 604
 605         mod_timer(&ifmsh->mesh_path_root_timer,
 606                   round_jiffies(TU_TO_EXP_TIME(interval)));
 607 }
 608
 609 static int
 610 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 611 {
 612         struct beacon_data *bcn;
 613         int head_len, tail_len;
 614         struct sk_buff *skb;
 615         struct ieee80211_mgmt *mgmt;
 616         struct ieee80211_chanctx_conf *chanctx_conf;
 617         struct mesh_csa_settings *csa;
 618         enum ieee80211_band band;
 619         u8 *pos;
 620         struct ieee80211_sub_if_data *sdata;
 621         int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
 622                       sizeof(mgmt->u.beacon);
 623
 624         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 625         rcu_read_lock();
 626         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 627         band = chanctx_conf->def.chan->band;
 628         rcu_read_unlock();
 629
 630         head_len = hdr_len +
 631                    2 + /* NULL SSID */
 632                    /* Channel Switch Announcement */
 633                    2 + sizeof(struct ieee80211_channel_sw_ie) +
 634                    /* Mesh Channel Swith Parameters */
 635                    2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
 636                    2 + 8 + /* supported rates */
 637                    2 + 3; /* DS params */
 638         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 639                    2 + sizeof(struct ieee80211_ht_cap) +
 640                    2 + sizeof(struct ieee80211_ht_operation) +
 641                    2 + ifmsh->mesh_id_len +
 642                    2 + sizeof(struct ieee80211_meshconf_ie) +
 643                    2 + sizeof(__le16) + /* awake window */
 644                    ifmsh->ie_len;
 645
 646         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 647         /* need an skb for IE builders to operate on */
 648         skb = dev_alloc_skb(max(head_len, tail_len));
 649
 650         if (!bcn || !skb)
 651                 goto out_free;
 652
 653         /*
 654          * pointers go into the block we allocated,
 655          * memory is | beacon_data | head | tail |
 656          */
 657         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 658
 659         /* fill in the head */
 660         mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
 661         memset(mgmt, 0, hdr_len);
 662         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 663                                           IEEE80211_STYPE_BEACON);
 664         eth_broadcast_addr(mgmt->da);
 665         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 666         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 667         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 668         mgmt->u.beacon.beacon_int =
 669                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 670         mgmt->u.beacon.capab_info |= cpu_to_le16(
 671                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 672
 673         pos = skb_put(skb, 2);
 674         *pos++ = WLAN_EID_SSID;
 675         *pos++ = 0x0;
 676
 677         rcu_read_lock();
 678         csa = rcu_dereference(ifmsh->csa);
 679         if (csa) {
 680                 pos = skb_put(skb, 13);
 681                 memset(pos, 0, 13);
 682                 *pos++ = WLAN_EID_CHANNEL_SWITCH;
 683                 *pos++ = 3;
 684                 *pos++ = 0x0;
 685                 *pos++ = ieee80211_frequency_to_channel(
 686                                 csa->settings.chandef.chan->center_freq);
 687                 sdata->csa_counter_offset_beacon = hdr_len + 6;
 688                 *pos++ = csa->settings.count;
 689                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
 690                 *pos++ = 6;
 691                 if (ifmsh->chsw_init) {
 692                         *pos++ = ifmsh->mshcfg.dot11MeshTTL;
 693                         *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
 694                 } else {
 695                         *pos++ = ifmsh->chsw_ttl;
 696                 }
 697                 *pos++ |= csa->settings.block_tx ?
 698                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
 699                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
 700                 pos += 2;
 701                 put_unaligned_le16(ifmsh->pre_value, pos);
 702                 pos += 2;
 703         }
 704         rcu_read_unlock();
 705
 706         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 707             mesh_add_ds_params_ie(sdata, skb))
 708                 goto out_free;
 709
 710         bcn->head_len = skb->len;
 711         memcpy(bcn->head, skb->data, bcn->head_len);
 712
 713         /* now the tail */
 714         skb_trim(skb, 0);
 715         bcn->tail = bcn->head + bcn->head_len;
 716
 717         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 718             mesh_add_rsn_ie(sdata, skb) ||
 719             mesh_add_ht_cap_ie(sdata, skb) ||
 720             mesh_add_ht_oper_ie(sdata, skb) ||
 721             mesh_add_meshid_ie(sdata, skb) ||
 722             mesh_add_meshconf_ie(sdata, skb) ||
 723             mesh_add_awake_window_ie(sdata, skb) ||
 724             mesh_add_vendor_ies(sdata, skb))
 725                 goto out_free;
 726
 727         bcn->tail_len = skb->len;
 728         memcpy(bcn->tail, skb->data, bcn->tail_len);
 729         bcn->meshconf = (struct ieee80211_meshconf_ie *)
 730                                         (bcn->tail + ifmsh->meshconf_offset);
 731
 732         dev_kfree_skb(skb);
 733         rcu_assign_pointer(ifmsh->beacon, bcn);
 734         return 0;
 735 out_free:
 736         kfree(bcn);
 737         dev_kfree_skb(skb);
 738         return -ENOMEM;
 739 }
 740
 741 static int
 742 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 743 {
 744         struct beacon_data *old_bcn;
 745         int ret;
 746
 747         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
 748                                             lockdep_is_held(&sdata->wdev.mtx));
 749         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 750         if (ret)
 751                 /* just reuse old beacon */
 752                 return ret;
 753
 754         if (old_bcn)
 755                 kfree_rcu(old_bcn, rcu_head);
 756         return 0;
 757 }
 758
 759 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 760                                        u32 changed)
 761 {
 762         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 763         unsigned long bits = changed;
 764         u32 bit;
 765
 766         if (!bits)
 767                 return;
 768
 769         /* if we race with running work, worst case this work becomes a noop */
 770         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
 771                 set_bit(bit, &ifmsh->mbss_changed);
 772         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
 773         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 774 }
 775
 776 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 777 {
 778         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 779         struct ieee80211_local *local = sdata->local;
 780         u32 changed = BSS_CHANGED_BEACON |
 781                       BSS_CHANGED_BEACON_ENABLED |
 782                       BSS_CHANGED_HT |
 783                       BSS_CHANGED_BASIC_RATES |
 784                       BSS_CHANGED_BEACON_INT;
 785
 786         local->fif_other_bss++;
 787         /* mesh ifaces must set allmulti to forward mcast traffic */
 788         atomic_inc(&local->iff_allmultis);
 789         ieee80211_configure_filter(local);
 790
 791         ifmsh->mesh_cc_id = 0;  /* Disabled */
 792         /* register sync ops from extensible synchronization framework */
 793         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 794         ifmsh->adjusting_tbtt = false;
 795         ifmsh->sync_offset_clockdrift_max = 0;
 796         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 797         ieee80211_mesh_root_setup(ifmsh);
 798         ieee80211_queue_work(&local->hw, &sdata->work);
 799         sdata->vif.bss_conf.ht_operation_mode =
 800                                 ifmsh->mshcfg.ht_opmode;
 801         sdata->vif.bss_conf.enable_beacon = true;
 802
 803         changed |= ieee80211_mps_local_status_update(sdata);
 804
 805         if (ieee80211_mesh_build_beacon(ifmsh)) {
 806                 ieee80211_stop_mesh(sdata);
 807                 return -ENOMEM;
 808         }
 809
 810         ieee80211_recalc_dtim(local, sdata);
 811         ieee80211_bss_info_change_notify(sdata, changed);
 812
 813         netif_carrier_on(sdata->dev);
 814         return 0;
 815 }
 816
 817 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 818 {
 819         struct ieee80211_local *local = sdata->local;
 820         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 821         struct beacon_data *bcn;
 822
 823         netif_carrier_off(sdata->dev);
 824
 825         /* stop the beacon */
 826         ifmsh->mesh_id_len = 0;
 827         sdata->vif.bss_conf.enable_beacon = false;
 828         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 829         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 830         bcn = rcu_dereference_protected(ifmsh->beacon,
 831                                         lockdep_is_held(&sdata->wdev.mtx));
 832         rcu_assign_pointer(ifmsh->beacon, NULL);
 833         kfree_rcu(bcn, rcu_head);
 834
 835         /* flush STAs and mpaths on this iface */
 836         sta_info_flush(sdata);
 837         mesh_path_flush_by_iface(sdata);
 838
 839         /* free all potentially still buffered group-addressed frames */
 840         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
 841         skb_queue_purge(&ifmsh->ps.bc_buf);
 842
 843         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 844         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 845         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 846
 847         /* clear any mesh work (for next join) we may have accrued */
 848         ifmsh->wrkq_flags = 0;
 849         ifmsh->mbss_changed = 0;
 850
 851         local->fif_other_bss--;
 852         atomic_dec(&local->iff_allmultis);
 853         ieee80211_configure_filter(local);
 854 }
 855
 856 static bool
 857 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
 858                                  struct ieee802_11_elems *elems, bool beacon)
 859 {
 860         struct cfg80211_csa_settings params;
 861         struct ieee80211_csa_ie csa_ie;
 862         struct ieee80211_chanctx_conf *chanctx_conf;
 863         struct ieee80211_chanctx *chanctx;
 864         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 865         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 866         int err, num_chanctx;
 867         u32 sta_flags;
 868
 869         if (sdata->vif.csa_active)
 870                 return true;
 871
 872         if (!ifmsh->mesh_id)
 873                 return false;
 874
 875         sta_flags = IEEE80211_STA_DISABLE_VHT;
 876         switch (sdata->vif.bss_conf.chandef.width) {
 877         case NL80211_CHAN_WIDTH_20_NOHT:
 878                 sta_flags |= IEEE80211_STA_DISABLE_HT;
 879         case NL80211_CHAN_WIDTH_20:
 880                 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
 881                 break;
 882         default:
 883                 break;
 884         }
 885
 886         memset(&params, 0, sizeof(params));
 887         memset(&csa_ie, 0, sizeof(csa_ie));
 888         err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, band,
 889                                            sta_flags, sdata->vif.addr,
 890                                            &csa_ie);
 891         if (err < 0)
 892                 return false;
 893         if (err)
 894                 return false;
 895
 896         params.chandef = csa_ie.chandef;
 897         params.count = csa_ie.count;
 898
 899         if (sdata->vif.bss_conf.chandef.chan->band !=
 900             params.chandef.chan->band)
 901                 return false;
 902
 903         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
 904                                      IEEE80211_CHAN_DISABLED)) {
 905                 sdata_info(sdata,
 906                            "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
 907                            sdata->vif.addr,
 908                            params.chandef.chan->center_freq,
 909                            params.chandef.width,
 910                            params.chandef.center_freq1,
 911                            params.chandef.center_freq2);
 912                 return false;
 913         }
 914
 915         err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
 916                                             &params.chandef);
 917         if (err < 0)
 918                 return false;
 919         if (err) {
 920                 params.radar_required = true;
 921                 /* TODO: DFS not (yet) supported */
 922                 return false;
 923         }
 924
 925         rcu_read_lock();
 926         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 927         if (!chanctx_conf)
 928                 goto failed_chswitch;
 929
 930         /* don't handle for multi-VIF cases */
 931         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
 932         if (chanctx->refcount > 1)
 933                 goto failed_chswitch;
 934
 935         num_chanctx = 0;
 936         list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
 937                 num_chanctx++;
 938
 939         if (num_chanctx > 1)
 940                 goto failed_chswitch;
 941
 942         rcu_read_unlock();
 943
 944         mcsa_dbg(sdata,
 945                  "received channel switch announcement to go to channel %d MHz\n",
 946                  params.chandef.chan->center_freq);
 947
 948         params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
 949         if (beacon) {
 950                 ifmsh->chsw_ttl = csa_ie.ttl - 1;
 951                 if (ifmsh->pre_value >= csa_ie.pre_value)
 952                         return false;
 953                 ifmsh->pre_value = csa_ie.pre_value;
 954         }
 955
 956         if (ifmsh->chsw_ttl < ifmsh->mshcfg.dot11MeshTTL) {
 957                 if (ieee80211_mesh_csa_beacon(sdata, &params, false) < 0)
 958                         return false;
 959         } else {
 960                 return false;
 961         }
 962
 963         sdata->csa_radar_required = params.radar_required;
 964
 965         if (params.block_tx)
 966                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 967                                 IEEE80211_MAX_QUEUE_MAP,
 968                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 969
 970         sdata->csa_chandef = params.chandef;
 971         sdata->vif.csa_active = true;
 972
 973         ieee80211_bss_info_change_notify(sdata, err);
 974         drv_channel_switch_beacon(sdata, &params.chandef);
 975
 976         return true;
 977 failed_chswitch:
 978         rcu_read_unlock();
 979         return false;
 980 }
 981
 982 static void
 983 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
 984                             struct ieee80211_mgmt *mgmt, size_t len)
 985 {
 986         struct ieee80211_local *local = sdata->local;
 987         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 988         struct sk_buff *presp;
 989         struct beacon_data *bcn;
 990         struct ieee80211_mgmt *hdr;
 991         struct ieee802_11_elems elems;
 992         size_t baselen;
 993         u8 *pos;
 994
 995         pos = mgmt->u.probe_req.variable;
 996         baselen = (u8 *) pos - (u8 *) mgmt;
 997         if (baselen > len)
 998                 return;
 999
1000         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1001
1002         if (!elems.mesh_id)
1003                 return;
1004
1005         /* 802.11-2012 10.1.4.3.2 */
1006         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1007              !is_broadcast_ether_addr(mgmt->da)) ||
1008             elems.ssid_len != 0)
1009                 return;
1010
1011         if (elems.mesh_id_len != 0 &&
1012             (elems.mesh_id_len != ifmsh->mesh_id_len ||
1013              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1014                 return;
1015
1016         rcu_read_lock();
1017         bcn = rcu_dereference(ifmsh->beacon);
1018
1019         if (!bcn)
1020                 goto out;
1021
1022         presp = dev_alloc_skb(local->tx_headroom +
1023                               bcn->head_len + bcn->tail_len);
1024         if (!presp)
1025                 goto out;
1026
1027         skb_reserve(presp, local->tx_headroom);
1028         memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1029         memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1030         hdr = (struct ieee80211_mgmt *) presp->data;
1031         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1032                                          IEEE80211_STYPE_PROBE_RESP);
1033         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1034         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1035         ieee80211_tx_skb(sdata, presp);
1036 out:
1037         rcu_read_unlock();
1038 }
1039
1040 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1041                                         u16 stype,
1042                                         struct ieee80211_mgmt *mgmt,
1043                                         size_t len,
1044                                         struct ieee80211_rx_status *rx_status)
1045 {
1046         struct ieee80211_local *local = sdata->local;
1047         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1048         struct ieee802_11_elems elems;
1049         struct ieee80211_channel *channel;
1050         size_t baselen;
1051         int freq;
1052         enum ieee80211_band band = rx_status->band;
1053
1054         /* ignore ProbeResp to foreign address */
1055         if (stype == IEEE80211_STYPE_PROBE_RESP &&
1056             !ether_addr_equal(mgmt->da, sdata->vif.addr))
1057                 return;
1058
1059         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1060         if (baselen > len)
1061                 return;
1062
1063         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1064                                false, &elems);
1065
1066         /* ignore non-mesh or secure / unsecure mismatch */
1067         if ((!elems.mesh_id || !elems.mesh_config) ||
1068             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1069             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1070                 return;
1071
1072         if (elems.ds_params)
1073                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1074         else
1075                 freq = rx_status->freq;
1076
1077         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1078
1079         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1080                 return;
1081
1082         if (mesh_matches_local(sdata, &elems))
1083                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1084
1085         if (ifmsh->sync_ops)
1086                 ifmsh->sync_ops->rx_bcn_presp(sdata,
1087                         stype, mgmt, &elems, rx_status);
1088
1089         if (!ifmsh->chsw_init)
1090                 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1091 }
1092
1093 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1094 {
1095         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1096         struct mesh_csa_settings *tmp_csa_settings;
1097         int ret = 0;
1098
1099         /* Reset the TTL value and Initiator flag */
1100         ifmsh->chsw_init = false;
1101         ifmsh->chsw_ttl = 0;
1102
1103         /* Remove the CSA and MCSP elements from the beacon */
1104         tmp_csa_settings = rcu_dereference(ifmsh->csa);
1105         rcu_assign_pointer(ifmsh->csa, NULL);
1106         kfree_rcu(tmp_csa_settings, rcu_head);
1107         ret = ieee80211_mesh_rebuild_beacon(sdata);
1108         if (ret)
1109                 return -EINVAL;
1110
1111         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
1112
1113         mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1114                  sdata->vif.bss_conf.chandef.chan->center_freq);
1115         return 0;
1116 }
1117
1118 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1119                               struct cfg80211_csa_settings *csa_settings,
1120                               bool csa_action)
1121 {
1122         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1123         struct mesh_csa_settings *tmp_csa_settings;
1124         int ret = 0;
1125
1126         tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1127                                    GFP_ATOMIC);
1128         if (!tmp_csa_settings)
1129                 return -ENOMEM;
1130
1131         memcpy(&tmp_csa_settings->settings, csa_settings,
1132                sizeof(struct cfg80211_csa_settings));
1133
1134         rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1135
1136         ret = ieee80211_mesh_rebuild_beacon(sdata);
1137         if (ret) {
1138                 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1139                 rcu_assign_pointer(ifmsh->csa, NULL);
1140                 kfree_rcu(tmp_csa_settings, rcu_head);
1141                 return ret;
1142         }
1143
1144         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
1145
1146         if (csa_action)
1147                 ieee80211_send_action_csa(sdata, csa_settings);
1148
1149         return 0;
1150 }
1151
1152 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1153                                struct ieee80211_mgmt *mgmt, size_t len)
1154 {
1155         struct ieee80211_mgmt *mgmt_fwd;
1156         struct sk_buff *skb;
1157         struct ieee80211_local *local = sdata->local;
1158         u8 *pos = mgmt->u.action.u.chan_switch.variable;
1159         size_t offset_ttl;
1160
1161         skb = dev_alloc_skb(local->tx_headroom + len);
1162         if (!skb)
1163                 return -ENOMEM;
1164         skb_reserve(skb, local->tx_headroom);
1165         mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1166
1167         /* offset_ttl is based on whether the secondary channel
1168          * offset is available or not. Substract 1 from the mesh TTL
1169          * and disable the initiator flag before forwarding.
1170          */
1171         offset_ttl = (len < 42) ? 7 : 10;
1172         *(pos + offset_ttl) -= 1;
1173         *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1174
1175         memcpy(mgmt_fwd, mgmt, len);
1176         eth_broadcast_addr(mgmt_fwd->da);
1177         memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1178         memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1179
1180         ieee80211_tx_skb(sdata, skb);
1181         return 0;
1182 }
1183
1184 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1185                               struct ieee80211_mgmt *mgmt, size_t len)
1186 {
1187         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1188         struct ieee802_11_elems elems;
1189         u16 pre_value;
1190         bool fwd_csa = true;
1191         size_t baselen;
1192         u8 *pos;
1193
1194         if (mgmt->u.action.u.measurement.action_code !=
1195             WLAN_ACTION_SPCT_CHL_SWITCH)
1196                 return;
1197
1198         pos = mgmt->u.action.u.chan_switch.variable;
1199         baselen = offsetof(struct ieee80211_mgmt,
1200                            u.action.u.chan_switch.variable);
1201         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1202
1203         ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1204         if (!--ifmsh->chsw_ttl)
1205                 fwd_csa = false;
1206
1207         pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1208         if (ifmsh->pre_value >= pre_value)
1209                 return;
1210
1211         ifmsh->pre_value = pre_value;
1212
1213         if (!ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1214                 mcsa_dbg(sdata, "Failed to process CSA action frame");
1215                 return;
1216         }
1217
1218         /* forward or re-broadcast the CSA frame */
1219         if (fwd_csa) {
1220                 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1221                         mcsa_dbg(sdata, "Failed to forward the CSA frame");
1222         }
1223 }
1224
1225 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1226                                           struct ieee80211_mgmt *mgmt,
1227                                           size_t len,
1228                                           struct ieee80211_rx_status *rx_status)
1229 {
1230         switch (mgmt->u.action.category) {
1231         case WLAN_CATEGORY_SELF_PROTECTED:
1232                 switch (mgmt->u.action.u.self_prot.action_code) {
1233                 case WLAN_SP_MESH_PEERING_OPEN:
1234                 case WLAN_SP_MESH_PEERING_CLOSE:
1235                 case WLAN_SP_MESH_PEERING_CONFIRM:
1236                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1237                         break;
1238                 }
1239                 break;
1240         case WLAN_CATEGORY_MESH_ACTION:
1241                 if (mesh_action_is_path_sel(mgmt))
1242                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1243                 break;
1244         case WLAN_CATEGORY_SPECTRUM_MGMT:
1245                 mesh_rx_csa_frame(sdata, mgmt, len);
1246                 break;
1247         }
1248 }
1249
1250 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1251                                    struct sk_buff *skb)
1252 {
1253         struct ieee80211_rx_status *rx_status;
1254         struct ieee80211_mgmt *mgmt;
1255         u16 stype;
1256
1257         sdata_lock(sdata);
1258
1259         /* mesh already went down */
1260         if (!sdata->wdev.mesh_id_len)
1261                 goto out;
1262
1263         rx_status = IEEE80211_SKB_RXCB(skb);
1264         mgmt = (struct ieee80211_mgmt *) skb->data;
1265         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1266
1267         switch (stype) {
1268         case IEEE80211_STYPE_PROBE_RESP:
1269         case IEEE80211_STYPE_BEACON:
1270                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1271                                             rx_status);
1272                 break;
1273         case IEEE80211_STYPE_PROBE_REQ:
1274                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1275                 break;
1276         case IEEE80211_STYPE_ACTION:
1277                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1278                 break;
1279         }
1280 out:
1281         sdata_unlock(sdata);
1282 }
1283
1284 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1285 {
1286         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1287         u32 bit, changed = 0;
1288
1289         for_each_set_bit(bit, &ifmsh->mbss_changed,
1290                          sizeof(changed) * BITS_PER_BYTE) {
1291                 clear_bit(bit, &ifmsh->mbss_changed);
1292                 changed |= BIT(bit);
1293         }
1294
1295         if (sdata->vif.bss_conf.enable_beacon &&
1296             (changed & (BSS_CHANGED_BEACON |
1297                         BSS_CHANGED_HT |
1298                         BSS_CHANGED_BASIC_RATES |
1299                         BSS_CHANGED_BEACON_INT)))
1300                 if (ieee80211_mesh_rebuild_beacon(sdata))
1301                         return;
1302
1303         ieee80211_bss_info_change_notify(sdata, changed);
1304 }
1305
1306 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1307 {
1308         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1309
1310         sdata_lock(sdata);
1311
1312         /* mesh already went down */
1313         if (!sdata->wdev.mesh_id_len)
1314                 goto out;
1315
1316         if (ifmsh->preq_queue_len &&
1317             time_after(jiffies,
1318                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1319                 mesh_path_start_discovery(sdata);
1320
1321         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
1322                 mesh_mpath_table_grow();
1323
1324         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
1325                 mesh_mpp_table_grow();
1326
1327         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1328                 ieee80211_mesh_housekeeping(sdata);
1329
1330         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1331                 ieee80211_mesh_rootpath(sdata);
1332
1333         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1334                 mesh_sync_adjust_tbtt(sdata);
1335
1336         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1337                 mesh_bss_info_changed(sdata);
1338 out:
1339         sdata_unlock(sdata);
1340 }
1341
1342 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
1343 {
1344         struct ieee80211_sub_if_data *sdata;
1345
1346         rcu_read_lock();
1347         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1348                 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1349                     ieee80211_sdata_running(sdata))
1350                         ieee80211_queue_work(&local->hw, &sdata->work);
1351         rcu_read_unlock();
1352 }
1353
1354 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1355 {
1356         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1357         static u8 zero_addr[ETH_ALEN] = {};
1358
1359         setup_timer(&ifmsh->housekeeping_timer,
1360                     ieee80211_mesh_housekeeping_timer,
1361                     (unsigned long) sdata);
1362
1363         ifmsh->accepting_plinks = true;
1364         atomic_set(&ifmsh->mpaths, 0);
1365         mesh_rmc_init(sdata);
1366         ifmsh->last_preq = jiffies;
1367         ifmsh->next_perr = jiffies;
1368         ifmsh->chsw_init = false;
1369         /* Allocate all mesh structures when creating the first mesh interface. */
1370         if (!mesh_allocated)
1371                 ieee80211s_init();
1372         setup_timer(&ifmsh->mesh_path_timer,
1373                     ieee80211_mesh_path_timer,
1374                     (unsigned long) sdata);
1375         setup_timer(&ifmsh->mesh_path_root_timer,
1376                     ieee80211_mesh_path_root_timer,
1377                     (unsigned long) sdata);
1378         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1379         skb_queue_head_init(&ifmsh->ps.bc_buf);
1380         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1381         spin_lock_init(&ifmsh->sync_offset_lock);
1382         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1383
1384         sdata->vif.bss_conf.bssid = zero_addr;
1385 }