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
  16 static int mesh_allocated;
  17 static struct kmem_cache *rm_cache;
  18
  19 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  20 {
  21         return (mgmt->u.action.u.mesh_action.action_code ==
  22                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  23 }
  24
  25 void ieee80211s_init(void)
  26 {
  27         mesh_pathtbl_init();
  28         mesh_allocated = 1;
  29         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  30                                      0, 0, NULL);
  31 }
  32
  33 void ieee80211s_stop(void)
  34 {
  35         if (!mesh_allocated)
  36                 return;
  37         mesh_pathtbl_unregister();
  38         kmem_cache_destroy(rm_cache);
  39 }
  40
  41 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  42 {
  43         struct ieee80211_sub_if_data *sdata = (void *) data;
  44         struct ieee80211_local *local = sdata->local;
  45         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  46
  47         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  48
  49         ieee80211_queue_work(&local->hw, &sdata->work);
  50 }
  51
  52 /**
  53  * mesh_matches_local - check if the config of a mesh point matches ours
  54  *
  55  * @sdata: local mesh subif
  56  * @ie: information elements of a management frame from the mesh peer
  57  *
  58  * This function checks if the mesh configuration of a mesh point matches the
  59  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  60  */
  61 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  62                         struct ieee802_11_elems *ie)
  63 {
  64         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  65         struct ieee80211_local *local = sdata->local;
  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(local, 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         /* Active path selection protocol ID */
 263         *pos++ = ifmsh->mesh_pp_id;
 264         /* Active path selection metric ID   */
 265         *pos++ = ifmsh->mesh_pm_id;
 266         /* Congestion control mode identifier */
 267         *pos++ = ifmsh->mesh_cc_id;
 268         /* Synchronization protocol identifier */
 269         *pos++ = ifmsh->mesh_sp_id;
 270         /* Authentication Protocol identifier */
 271         *pos++ = ifmsh->mesh_auth_id;
 272         /* Mesh Formation Info - number of neighbors */
 273         neighbors = atomic_read(&ifmsh->estab_plinks);
 274         neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
 275         *pos++ = neighbors << 1;
 276         /* Mesh capability */
 277         *pos = IEEE80211_MESHCONF_CAPAB_FORWARDING;
 278         *pos |= ifmsh->accepting_plinks ?
 279                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 280         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 281         *pos |= ifmsh->ps_peers_deep_sleep ?
 282                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 283         *pos++ |= ifmsh->adjusting_tbtt ?
 284                         IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 285         *pos++ = 0x00;
 286
 287         return 0;
 288 }
 289
 290 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 291 {
 292         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 293         u8 *pos;
 294
 295         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 296                 return -ENOMEM;
 297
 298         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 299         *pos++ = WLAN_EID_MESH_ID;
 300         *pos++ = ifmsh->mesh_id_len;
 301         if (ifmsh->mesh_id_len)
 302                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 303
 304         return 0;
 305 }
 306
 307 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 308                                     struct sk_buff *skb)
 309 {
 310         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 311         u8 *pos;
 312
 313         /* see IEEE802.11-2012 13.14.6 */
 314         if (ifmsh->ps_peers_light_sleep == 0 &&
 315             ifmsh->ps_peers_deep_sleep == 0 &&
 316             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 317                 return 0;
 318
 319         if (skb_tailroom(skb) < 4)
 320                 return -ENOMEM;
 321
 322         pos = skb_put(skb, 2 + 2);
 323         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 324         *pos++ = 2;
 325         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 326
 327         return 0;
 328 }
 329
 330 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 331                         struct sk_buff *skb)
 332 {
 333         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 334         u8 offset, len;
 335         const u8 *data;
 336
 337         if (!ifmsh->ie || !ifmsh->ie_len)
 338                 return 0;
 339
 340         /* fast-forward to vendor IEs */
 341         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 342
 343         if (offset) {
 344                 len = ifmsh->ie_len - offset;
 345                 data = ifmsh->ie + offset;
 346                 if (skb_tailroom(skb) < len)
 347                         return -ENOMEM;
 348                 memcpy(skb_put(skb, len), data, len);
 349         }
 350
 351         return 0;
 352 }
 353
 354 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 355 {
 356         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 357         u8 len = 0;
 358         const u8 *data;
 359
 360         if (!ifmsh->ie || !ifmsh->ie_len)
 361                 return 0;
 362
 363         /* find RSN IE */
 364         data = ifmsh->ie;
 365         while (data < ifmsh->ie + ifmsh->ie_len) {
 366                 if (*data == WLAN_EID_RSN) {
 367                         len = data[1] + 2;
 368                         break;
 369                 }
 370                 data++;
 371         }
 372
 373         if (len) {
 374                 if (skb_tailroom(skb) < len)
 375                         return -ENOMEM;
 376                 memcpy(skb_put(skb, len), data, len);
 377         }
 378
 379         return 0;
 380 }
 381
 382 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 383                                  struct sk_buff *skb)
 384 {
 385         struct ieee80211_chanctx_conf *chanctx_conf;
 386         struct ieee80211_channel *chan;
 387         u8 *pos;
 388
 389         if (skb_tailroom(skb) < 3)
 390                 return -ENOMEM;
 391
 392         rcu_read_lock();
 393         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 394         if (WARN_ON(!chanctx_conf)) {
 395                 rcu_read_unlock();
 396                 return -EINVAL;
 397         }
 398         chan = chanctx_conf->def.chan;
 399         rcu_read_unlock();
 400
 401         pos = skb_put(skb, 2 + 1);
 402         *pos++ = WLAN_EID_DS_PARAMS;
 403         *pos++ = 1;
 404         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 405
 406         return 0;
 407 }
 408
 409 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 410                        struct sk_buff *skb)
 411 {
 412         struct ieee80211_local *local = sdata->local;
 413         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 414         struct ieee80211_supported_band *sband;
 415         u8 *pos;
 416
 417         sband = local->hw.wiphy->bands[band];
 418         if (!sband->ht_cap.ht_supported ||
 419             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
 420             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
 421             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
 422                 return 0;
 423
 424         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 425                 return -ENOMEM;
 426
 427         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 428         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 429
 430         return 0;
 431 }
 432
 433 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 434                         struct sk_buff *skb)
 435 {
 436         struct ieee80211_local *local = sdata->local;
 437         struct ieee80211_chanctx_conf *chanctx_conf;
 438         struct ieee80211_channel *channel;
 439         enum nl80211_channel_type channel_type =
 440                 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
 441         struct ieee80211_supported_band *sband;
 442         struct ieee80211_sta_ht_cap *ht_cap;
 443         u8 *pos;
 444
 445         rcu_read_lock();
 446         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 447         if (WARN_ON(!chanctx_conf)) {
 448                 rcu_read_unlock();
 449                 return -EINVAL;
 450         }
 451         channel = chanctx_conf->def.chan;
 452         rcu_read_unlock();
 453
 454         sband = local->hw.wiphy->bands[channel->band];
 455         ht_cap = &sband->ht_cap;
 456
 457         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 458                 return 0;
 459
 460         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 461                 return -ENOMEM;
 462
 463         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 464         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 465                                    sdata->vif.bss_conf.ht_operation_mode);
 466
 467         return 0;
 468 }
 469
 470 static void ieee80211_mesh_path_timer(unsigned long data)
 471 {
 472         struct ieee80211_sub_if_data *sdata =
 473                 (struct ieee80211_sub_if_data *) data;
 474
 475         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 476 }
 477
 478 static void ieee80211_mesh_path_root_timer(unsigned long data)
 479 {
 480         struct ieee80211_sub_if_data *sdata =
 481                 (struct ieee80211_sub_if_data *) data;
 482         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 483
 484         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 485
 486         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 487 }
 488
 489 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 490 {
 491         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 492                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 493         else {
 494                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 495                 /* stop running timer */
 496                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 497         }
 498 }
 499
 500 /**
 501  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 502  * @hdr:        802.11 frame header
 503  * @fc:         frame control field
 504  * @meshda:     destination address in the mesh
 505  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 506  *              locally originated.
 507  *
 508  * Return the length of the 802.11 (does not include a mesh control header)
 509  */
 510 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 511                                   const u8 *meshda, const u8 *meshsa)
 512 {
 513         if (is_multicast_ether_addr(meshda)) {
 514                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 515                 /* DA TA SA */
 516                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 517                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 518                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 519                 return 24;
 520         } else {
 521                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 522                 /* RA TA DA SA */
 523                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 524                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 525                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 526                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 527                 return 30;
 528         }
 529 }
 530
 531 /**
 532  * ieee80211_new_mesh_header - create a new mesh header
 533  * @sdata:      mesh interface to be used
 534  * @meshhdr:    uninitialized mesh header
 535  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 536  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 537  *              be NULL.
 538  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 539  *              mesh frame
 540  *
 541  * Return the header length.
 542  */
 543 int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 544                               struct ieee80211s_hdr *meshhdr,
 545                               const char *addr4or5, const char *addr6)
 546 {
 547         if (WARN_ON(!addr4or5 && addr6))
 548                 return 0;
 549
 550         memset(meshhdr, 0, sizeof(*meshhdr));
 551
 552         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 553
 554         /* FIXME: racy -- TX on multiple queues can be concurrent */
 555         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 556         sdata->u.mesh.mesh_seqnum++;
 557
 558         if (addr4or5 && !addr6) {
 559                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 560                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 561                 return 2 * ETH_ALEN;
 562         } else if (addr4or5 && addr6) {
 563                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 564                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 565                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 566                 return 3 * ETH_ALEN;
 567         }
 568
 569         return ETH_ALEN;
 570 }
 571
 572 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 573 {
 574         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 575         u32 changed;
 576
 577         ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
 578         mesh_path_expire(sdata);
 579
 580         changed = mesh_accept_plinks_update(sdata);
 581         ieee80211_mbss_info_change_notify(sdata, changed);
 582
 583         mod_timer(&ifmsh->housekeeping_timer,
 584                   round_jiffies(jiffies +
 585                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 586 }
 587
 588 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 589 {
 590         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 591         u32 interval;
 592
 593         mesh_path_tx_root_frame(sdata);
 594
 595         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 596                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 597         else
 598                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 599
 600         mod_timer(&ifmsh->mesh_path_root_timer,
 601                   round_jiffies(TU_TO_EXP_TIME(interval)));
 602 }
 603
 604 static int
 605 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 606 {
 607         struct beacon_data *bcn;
 608         int head_len, tail_len;
 609         struct sk_buff *skb;
 610         struct ieee80211_mgmt *mgmt;
 611         struct ieee80211_chanctx_conf *chanctx_conf;
 612         enum ieee80211_band band;
 613         u8 *pos;
 614         struct ieee80211_sub_if_data *sdata;
 615         int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
 616                       sizeof(mgmt->u.beacon);
 617
 618         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 619         rcu_read_lock();
 620         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 621         band = chanctx_conf->def.chan->band;
 622         rcu_read_unlock();
 623
 624         head_len = hdr_len +
 625                    2 + /* NULL SSID */
 626                    2 + 8 + /* supported rates */
 627                    2 + 3; /* DS params */
 628         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 629                    2 + sizeof(struct ieee80211_ht_cap) +
 630                    2 + sizeof(struct ieee80211_ht_operation) +
 631                    2 + ifmsh->mesh_id_len +
 632                    2 + sizeof(struct ieee80211_meshconf_ie) +
 633                    2 + sizeof(__le16) + /* awake window */
 634                    ifmsh->ie_len;
 635
 636         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 637         /* need an skb for IE builders to operate on */
 638         skb = dev_alloc_skb(max(head_len, tail_len));
 639
 640         if (!bcn || !skb)
 641                 goto out_free;
 642
 643         /*
 644          * pointers go into the block we allocated,
 645          * memory is | beacon_data | head | tail |
 646          */
 647         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 648
 649         /* fill in the head */
 650         mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
 651         memset(mgmt, 0, hdr_len);
 652         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 653                                           IEEE80211_STYPE_BEACON);
 654         eth_broadcast_addr(mgmt->da);
 655         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 656         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 657         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 658         mgmt->u.beacon.beacon_int =
 659                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 660         mgmt->u.beacon.capab_info |= cpu_to_le16(
 661                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 662
 663         pos = skb_put(skb, 2);
 664         *pos++ = WLAN_EID_SSID;
 665         *pos++ = 0x0;
 666
 667         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 668             mesh_add_ds_params_ie(sdata, skb))
 669                 goto out_free;
 670
 671         bcn->head_len = skb->len;
 672         memcpy(bcn->head, skb->data, bcn->head_len);
 673
 674         /* now the tail */
 675         skb_trim(skb, 0);
 676         bcn->tail = bcn->head + bcn->head_len;
 677
 678         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 679             mesh_add_rsn_ie(sdata, skb) ||
 680             mesh_add_ht_cap_ie(sdata, skb) ||
 681             mesh_add_ht_oper_ie(sdata, skb) ||
 682             mesh_add_meshid_ie(sdata, skb) ||
 683             mesh_add_meshconf_ie(sdata, skb) ||
 684             mesh_add_awake_window_ie(sdata, skb) ||
 685             mesh_add_vendor_ies(sdata, skb))
 686                 goto out_free;
 687
 688         bcn->tail_len = skb->len;
 689         memcpy(bcn->tail, skb->data, bcn->tail_len);
 690
 691         dev_kfree_skb(skb);
 692         rcu_assign_pointer(ifmsh->beacon, bcn);
 693         return 0;
 694 out_free:
 695         kfree(bcn);
 696         dev_kfree_skb(skb);
 697         return -ENOMEM;
 698 }
 699
 700 static int
 701 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 702 {
 703         struct beacon_data *old_bcn;
 704         int ret;
 705
 706         old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
 707                                             lockdep_is_held(&sdata->wdev.mtx));
 708         ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 709         if (ret)
 710                 /* just reuse old beacon */
 711                 return ret;
 712
 713         if (old_bcn)
 714                 kfree_rcu(old_bcn, rcu_head);
 715         return 0;
 716 }
 717
 718 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 719                                        u32 changed)
 720 {
 721         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 722         unsigned long bits = changed;
 723         u32 bit;
 724
 725         if (!bits)
 726                 return;
 727
 728         /* if we race with running work, worst case this work becomes a noop */
 729         for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
 730                 set_bit(bit, &ifmsh->mbss_changed);
 731         set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
 732         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 733 }
 734
 735 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 736 {
 737         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 738         struct ieee80211_local *local = sdata->local;
 739         u32 changed = BSS_CHANGED_BEACON |
 740                       BSS_CHANGED_BEACON_ENABLED |
 741                       BSS_CHANGED_HT |
 742                       BSS_CHANGED_BASIC_RATES |
 743                       BSS_CHANGED_BEACON_INT;
 744
 745         local->fif_other_bss++;
 746         /* mesh ifaces must set allmulti to forward mcast traffic */
 747         atomic_inc(&local->iff_allmultis);
 748         ieee80211_configure_filter(local);
 749
 750         ifmsh->mesh_cc_id = 0;  /* Disabled */
 751         /* register sync ops from extensible synchronization framework */
 752         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 753         ifmsh->adjusting_tbtt = false;
 754         ifmsh->sync_offset_clockdrift_max = 0;
 755         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 756         ieee80211_mesh_root_setup(ifmsh);
 757         ieee80211_queue_work(&local->hw, &sdata->work);
 758         sdata->vif.bss_conf.ht_operation_mode =
 759                                 ifmsh->mshcfg.ht_opmode;
 760         sdata->vif.bss_conf.enable_beacon = true;
 761
 762         changed |= ieee80211_mps_local_status_update(sdata);
 763
 764         if (ieee80211_mesh_build_beacon(ifmsh)) {
 765                 ieee80211_stop_mesh(sdata);
 766                 return -ENOMEM;
 767         }
 768
 769         ieee80211_bss_info_change_notify(sdata, changed);
 770
 771         netif_carrier_on(sdata->dev);
 772         return 0;
 773 }
 774
 775 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 776 {
 777         struct ieee80211_local *local = sdata->local;
 778         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 779         struct beacon_data *bcn;
 780
 781         netif_carrier_off(sdata->dev);
 782
 783         /* stop the beacon */
 784         ifmsh->mesh_id_len = 0;
 785         sdata->vif.bss_conf.enable_beacon = false;
 786         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 787         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 788         bcn = rcu_dereference_protected(ifmsh->beacon,
 789                                         lockdep_is_held(&sdata->wdev.mtx));
 790         rcu_assign_pointer(ifmsh->beacon, NULL);
 791         kfree_rcu(bcn, rcu_head);
 792
 793         /* flush STAs and mpaths on this iface */
 794         sta_info_flush(sdata);
 795         mesh_path_flush_by_iface(sdata);
 796
 797         /* free all potentially still buffered group-addressed frames */
 798         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
 799         skb_queue_purge(&ifmsh->ps.bc_buf);
 800
 801         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 802         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 803         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 804
 805         /* clear any mesh work (for next join) we may have accrued */
 806         ifmsh->wrkq_flags = 0;
 807         ifmsh->mbss_changed = 0;
 808
 809         local->fif_other_bss--;
 810         atomic_dec(&local->iff_allmultis);
 811         ieee80211_configure_filter(local);
 812 }
 813
 814 static void
 815 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
 816                             struct ieee80211_mgmt *mgmt, size_t len)
 817 {
 818         struct ieee80211_local *local = sdata->local;
 819         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 820         struct sk_buff *presp;
 821         struct beacon_data *bcn;
 822         struct ieee80211_mgmt *hdr;
 823         struct ieee802_11_elems elems;
 824         size_t baselen;
 825         u8 *pos;
 826
 827         pos = mgmt->u.probe_req.variable;
 828         baselen = (u8 *) pos - (u8 *) mgmt;
 829         if (baselen > len)
 830                 return;
 831
 832         ieee802_11_parse_elems(pos, len - baselen, false, &elems);
 833
 834         /* 802.11-2012 10.1.4.3.2 */
 835         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
 836              !is_broadcast_ether_addr(mgmt->da)) ||
 837             elems.ssid_len != 0)
 838                 return;
 839
 840         if (elems.mesh_id_len != 0 &&
 841             (elems.mesh_id_len != ifmsh->mesh_id_len ||
 842              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
 843                 return;
 844
 845         rcu_read_lock();
 846         bcn = rcu_dereference(ifmsh->beacon);
 847
 848         if (!bcn)
 849                 goto out;
 850
 851         presp = dev_alloc_skb(local->tx_headroom +
 852                               bcn->head_len + bcn->tail_len);
 853         if (!presp)
 854                 goto out;
 855
 856         skb_reserve(presp, local->tx_headroom);
 857         memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
 858         memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
 859         hdr = (struct ieee80211_mgmt *) presp->data;
 860         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 861                                          IEEE80211_STYPE_PROBE_RESP);
 862         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
 863         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 864         ieee80211_tx_skb(sdata, presp);
 865 out:
 866         rcu_read_unlock();
 867 }
 868
 869 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 870                                         u16 stype,
 871                                         struct ieee80211_mgmt *mgmt,
 872                                         size_t len,
 873                                         struct ieee80211_rx_status *rx_status)
 874 {
 875         struct ieee80211_local *local = sdata->local;
 876         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 877         struct ieee802_11_elems elems;
 878         struct ieee80211_channel *channel;
 879         size_t baselen;
 880         int freq;
 881         enum ieee80211_band band = rx_status->band;
 882
 883         /* ignore ProbeResp to foreign address */
 884         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 885             !ether_addr_equal(mgmt->da, sdata->vif.addr))
 886                 return;
 887
 888         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 889         if (baselen > len)
 890                 return;
 891
 892         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 893                                false, &elems);
 894
 895         /* ignore non-mesh or secure / unsecure mismatch */
 896         if ((!elems.mesh_id || !elems.mesh_config) ||
 897             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
 898             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
 899                 return;
 900
 901         if (elems.ds_params)
 902                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 903         else
 904                 freq = rx_status->freq;
 905
 906         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 907
 908         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 909                 return;
 910
 911         if (mesh_matches_local(sdata, &elems))
 912                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 913
 914         if (ifmsh->sync_ops)
 915                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 916                         stype, mgmt, &elems, rx_status);
 917 }
 918
 919 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 920                                           struct ieee80211_mgmt *mgmt,
 921                                           size_t len,
 922                                           struct ieee80211_rx_status *rx_status)
 923 {
 924         switch (mgmt->u.action.category) {
 925         case WLAN_CATEGORY_SELF_PROTECTED:
 926                 switch (mgmt->u.action.u.self_prot.action_code) {
 927                 case WLAN_SP_MESH_PEERING_OPEN:
 928                 case WLAN_SP_MESH_PEERING_CLOSE:
 929                 case WLAN_SP_MESH_PEERING_CONFIRM:
 930                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 931                         break;
 932                 }
 933                 break;
 934         case WLAN_CATEGORY_MESH_ACTION:
 935                 if (mesh_action_is_path_sel(mgmt))
 936                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 937                 break;
 938         }
 939 }
 940
 941 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 942                                    struct sk_buff *skb)
 943 {
 944         struct ieee80211_rx_status *rx_status;
 945         struct ieee80211_mgmt *mgmt;
 946         u16 stype;
 947
 948         sdata_lock(sdata);
 949
 950         /* mesh already went down */
 951         if (!sdata->wdev.mesh_id_len)
 952                 goto out;
 953
 954         rx_status = IEEE80211_SKB_RXCB(skb);
 955         mgmt = (struct ieee80211_mgmt *) skb->data;
 956         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 957
 958         switch (stype) {
 959         case IEEE80211_STYPE_PROBE_RESP:
 960         case IEEE80211_STYPE_BEACON:
 961                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 962                                             rx_status);
 963                 break;
 964         case IEEE80211_STYPE_PROBE_REQ:
 965                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
 966                 break;
 967         case IEEE80211_STYPE_ACTION:
 968                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 969                 break;
 970         }
 971 out:
 972         sdata_unlock(sdata);
 973 }
 974
 975 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
 976 {
 977         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 978         u32 bit, changed = 0;
 979
 980         for_each_set_bit(bit, &ifmsh->mbss_changed,
 981                          sizeof(changed) * BITS_PER_BYTE) {
 982                 clear_bit(bit, &ifmsh->mbss_changed);
 983                 changed |= BIT(bit);
 984         }
 985
 986         if (sdata->vif.bss_conf.enable_beacon &&
 987             (changed & (BSS_CHANGED_BEACON |
 988                         BSS_CHANGED_HT |
 989                         BSS_CHANGED_BASIC_RATES |
 990                         BSS_CHANGED_BEACON_INT)))
 991                 if (ieee80211_mesh_rebuild_beacon(sdata))
 992                         return;
 993
 994         ieee80211_bss_info_change_notify(sdata, changed);
 995 }
 996
 997 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 998 {
 999         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1000
1001         sdata_lock(sdata);
1002
1003         /* mesh already went down */
1004         if (!sdata->wdev.mesh_id_len)
1005                 goto out;
1006
1007         if (ifmsh->preq_queue_len &&
1008             time_after(jiffies,
1009                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1010                 mesh_path_start_discovery(sdata);
1011
1012         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
1013                 mesh_mpath_table_grow();
1014
1015         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
1016                 mesh_mpp_table_grow();
1017
1018         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1019                 ieee80211_mesh_housekeeping(sdata);
1020
1021         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1022                 ieee80211_mesh_rootpath(sdata);
1023
1024         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1025                 mesh_sync_adjust_tbtt(sdata);
1026
1027         if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1028                 mesh_bss_info_changed(sdata);
1029 out:
1030         sdata_unlock(sdata);
1031 }
1032
1033 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
1034 {
1035         struct ieee80211_sub_if_data *sdata;
1036
1037         rcu_read_lock();
1038         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1039                 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1040                     ieee80211_sdata_running(sdata))
1041                         ieee80211_queue_work(&local->hw, &sdata->work);
1042         rcu_read_unlock();
1043 }
1044
1045 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1046 {
1047         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1048         static u8 zero_addr[ETH_ALEN] = {};
1049
1050         setup_timer(&ifmsh->housekeeping_timer,
1051                     ieee80211_mesh_housekeeping_timer,
1052                     (unsigned long) sdata);
1053
1054         ifmsh->accepting_plinks = true;
1055         ifmsh->preq_id = 0;
1056         ifmsh->sn = 0;
1057         ifmsh->num_gates = 0;
1058         atomic_set(&ifmsh->mpaths, 0);
1059         mesh_rmc_init(sdata);
1060         ifmsh->last_preq = jiffies;
1061         ifmsh->next_perr = jiffies;
1062         /* Allocate all mesh structures when creating the first mesh interface. */
1063         if (!mesh_allocated)
1064                 ieee80211s_init();
1065         setup_timer(&ifmsh->mesh_path_timer,
1066                     ieee80211_mesh_path_timer,
1067                     (unsigned long) sdata);
1068         setup_timer(&ifmsh->mesh_path_root_timer,
1069                     ieee80211_mesh_path_root_timer,
1070                     (unsigned long) sdata);
1071         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1072         skb_queue_head_init(&ifmsh->ps.bc_buf);
1073         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1074         spin_lock_init(&ifmsh->sync_offset_lock);
1075         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1076
1077         sdata->vif.bss_conf.bssid = zero_addr;
1078 }