Pileus Git - ~andy/linux/blob - 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         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 275         neighbors = (neighbors > 15) ? 15 : neighbors;
 276         *pos++ = neighbors << 1;
 277         /* Mesh capability */
 278         *pos = IEEE80211_MESHCONF_CAPAB_FORWARDING;
 279         *pos |= ifmsh->accepting_plinks ?
 280                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 281         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 282         *pos |= ifmsh->ps_peers_deep_sleep ?
 283                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 284         *pos++ |= ifmsh->adjusting_tbtt ?
 285                         IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 286         *pos++ = 0x00;
 287
 288         return 0;
 289 }
 290
 291 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 292 {
 293         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 294         u8 *pos;
 295
 296         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 297                 return -ENOMEM;
 298
 299         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 300         *pos++ = WLAN_EID_MESH_ID;
 301         *pos++ = ifmsh->mesh_id_len;
 302         if (ifmsh->mesh_id_len)
 303                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 304
 305         return 0;
 306 }
 307
 308 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 309                                     struct sk_buff *skb)
 310 {
 311         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 312         u8 *pos;
 313
 314         /* see IEEE802.11-2012 13.14.6 */
 315         if (ifmsh->ps_peers_light_sleep == 0 &&
 316             ifmsh->ps_peers_deep_sleep == 0 &&
 317             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 318                 return 0;
 319
 320         if (skb_tailroom(skb) < 4)
 321                 return -ENOMEM;
 322
 323         pos = skb_put(skb, 2 + 2);
 324         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 325         *pos++ = 2;
 326         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 327
 328         return 0;
 329 }
 330
 331 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 332                         struct sk_buff *skb)
 333 {
 334         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 335         u8 offset, len;
 336         const u8 *data;
 337
 338         if (!ifmsh->ie || !ifmsh->ie_len)
 339                 return 0;
 340
 341         /* fast-forward to vendor IEs */
 342         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 343
 344         if (offset) {
 345                 len = ifmsh->ie_len - offset;
 346                 data = ifmsh->ie + offset;
 347                 if (skb_tailroom(skb) < len)
 348                         return -ENOMEM;
 349                 memcpy(skb_put(skb, len), data, len);
 350         }
 351
 352         return 0;
 353 }
 354
 355 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 356 {
 357         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 358         u8 len = 0;
 359         const u8 *data;
 360
 361         if (!ifmsh->ie || !ifmsh->ie_len)
 362                 return 0;
 363
 364         /* find RSN IE */
 365         data = ifmsh->ie;
 366         while (data < ifmsh->ie + ifmsh->ie_len) {
 367                 if (*data == WLAN_EID_RSN) {
 368                         len = data[1] + 2;
 369                         break;
 370                 }
 371                 data++;
 372         }
 373
 374         if (len) {
 375                 if (skb_tailroom(skb) < len)
 376                         return -ENOMEM;
 377                 memcpy(skb_put(skb, len), data, len);
 378         }
 379
 380         return 0;
 381 }
 382
 383 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 384                                  struct sk_buff *skb)
 385 {
 386         struct ieee80211_chanctx_conf *chanctx_conf;
 387         struct ieee80211_channel *chan;
 388         u8 *pos;
 389
 390         if (skb_tailroom(skb) < 3)
 391                 return -ENOMEM;
 392
 393         rcu_read_lock();
 394         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 395         if (WARN_ON(!chanctx_conf)) {
 396                 rcu_read_unlock();
 397                 return -EINVAL;
 398         }
 399         chan = chanctx_conf->def.chan;
 400         rcu_read_unlock();
 401
 402         pos = skb_put(skb, 2 + 1);
 403         *pos++ = WLAN_EID_DS_PARAMS;
 404         *pos++ = 1;
 405         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 406
 407         return 0;
 408 }
 409
 410 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 411                        struct sk_buff *skb)
 412 {
 413         struct ieee80211_local *local = sdata->local;
 414         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 415         struct ieee80211_supported_band *sband;
 416         u8 *pos;
 417
 418         sband = local->hw.wiphy->bands[band];
 419         if (!sband->ht_cap.ht_supported ||
 420             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT)
 421                 return 0;
 422
 423         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 424                 return -ENOMEM;
 425
 426         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 427         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 428
 429         return 0;
 430 }
 431
 432 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 433                         struct sk_buff *skb)
 434 {
 435         struct ieee80211_local *local = sdata->local;
 436         struct ieee80211_chanctx_conf *chanctx_conf;
 437         struct ieee80211_channel *channel;
 438         enum nl80211_channel_type channel_type =
 439                 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
 440         struct ieee80211_supported_band *sband;
 441         struct ieee80211_sta_ht_cap *ht_cap;
 442         u8 *pos;
 443
 444         rcu_read_lock();
 445         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 446         if (WARN_ON(!chanctx_conf)) {
 447                 rcu_read_unlock();
 448                 return -EINVAL;
 449         }
 450         channel = chanctx_conf->def.chan;
 451         rcu_read_unlock();
 452
 453         sband = local->hw.wiphy->bands[channel->band];
 454         ht_cap = &sband->ht_cap;
 455
 456         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 457                 return 0;
 458
 459         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 460                 return -ENOMEM;
 461
 462         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 463         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 464                                    sdata->vif.bss_conf.ht_operation_mode);
 465
 466         return 0;
 467 }
 468
 469 static void ieee80211_mesh_path_timer(unsigned long data)
 470 {
 471         struct ieee80211_sub_if_data *sdata =
 472                 (struct ieee80211_sub_if_data *) data;
 473
 474         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 475 }
 476
 477 static void ieee80211_mesh_path_root_timer(unsigned long data)
 478 {
 479         struct ieee80211_sub_if_data *sdata =
 480                 (struct ieee80211_sub_if_data *) data;
 481         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 482
 483         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 484
 485         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 486 }
 487
 488 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 489 {
 490         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 491                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 492         else {
 493                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 494                 /* stop running timer */
 495                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 496         }
 497 }
 498
 499 /**
 500  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 501  * @hdr:        802.11 frame header
 502  * @fc:         frame control field
 503  * @meshda:     destination address in the mesh
 504  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 505  *              locally originated.
 506  *
 507  * Return the length of the 802.11 (does not include a mesh control header)
 508  */
 509 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 510                                   const u8 *meshda, const u8 *meshsa)
 511 {
 512         if (is_multicast_ether_addr(meshda)) {
 513                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 514                 /* DA TA SA */
 515                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 516                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 517                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 518                 return 24;
 519         } else {
 520                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 521                 /* RA TA DA SA */
 522                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 523                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 524                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 525                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 526                 return 30;
 527         }
 528 }
 529
 530 /**
 531  * ieee80211_new_mesh_header - create a new mesh header
 532  * @sdata:      mesh interface to be used
 533  * @meshhdr:    uninitialized mesh header
 534  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 535  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 536  *              be NULL.
 537  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 538  *              mesh frame
 539  *
 540  * Return the header length.
 541  */
 542 int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 543                               struct ieee80211s_hdr *meshhdr,
 544                               const char *addr4or5, const char *addr6)
 545 {
 546         if (WARN_ON(!addr4or5 && addr6))
 547                 return 0;
 548
 549         memset(meshhdr, 0, sizeof(*meshhdr));
 550
 551         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 552
 553         /* FIXME: racy -- TX on multiple queues can be concurrent */
 554         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 555         sdata->u.mesh.mesh_seqnum++;
 556
 557         if (addr4or5 && !addr6) {
 558                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 559                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 560                 return 2 * ETH_ALEN;
 561         } else if (addr4or5 && addr6) {
 562                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 563                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 564                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 565                 return 3 * ETH_ALEN;
 566         }
 567
 568         return ETH_ALEN;
 569 }
 570
 571 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 572 {
 573         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 574         u32 changed;
 575
 576         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 577         mesh_path_expire(sdata);
 578
 579         changed = mesh_accept_plinks_update(sdata);
 580         ieee80211_mbss_info_change_notify(sdata, changed);
 581
 582         mod_timer(&ifmsh->housekeeping_timer,
 583                   round_jiffies(jiffies +
 584                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 585 }
 586
 587 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 588 {
 589         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 590         u32 interval;
 591
 592         mesh_path_tx_root_frame(sdata);
 593
 594         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 595                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 596         else
 597                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 598
 599         mod_timer(&ifmsh->mesh_path_root_timer,
 600                   round_jiffies(TU_TO_EXP_TIME(interval)));
 601 }
 602
 603 static int
 604 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 605 {
 606         struct beacon_data *bcn;
 607         int head_len, tail_len;
 608         struct sk_buff *skb;
 609         struct ieee80211_mgmt *mgmt;
 610         struct ieee80211_chanctx_conf *chanctx_conf;
 611         enum ieee80211_band band;
 612         u8 *pos;
 613         struct ieee80211_sub_if_data *sdata;
 614         int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
 615                       sizeof(mgmt->u.beacon);
 616
 617         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 618         rcu_read_lock();
 619         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 620         band = chanctx_conf->def.chan->band;
 621         rcu_read_unlock();
 622
 623         head_len = hdr_len +
 624                    2 + /* NULL SSID */
 625                    2 + 8 + /* supported rates */
 626                    2 + 3; /* DS params */
 627         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 628                    2 + sizeof(struct ieee80211_ht_cap) +
 629                    2 + sizeof(struct ieee80211_ht_operation) +
 630                    2 + ifmsh->mesh_id_len +
 631                    2 + sizeof(struct ieee80211_meshconf_ie) +
 632                    2 + sizeof(__le16) + /* awake window */
 633                    ifmsh->ie_len;
 634
 635         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 636         /* need an skb for IE builders to operate on */
 637         skb = dev_alloc_skb(max(head_len, tail_len));
 638
 639         if (!bcn || !skb)
 640                 goto out_free;
 641
 642         /*
 643          * pointers go into the block we allocated,
 644          * memory is | beacon_data | head | tail |
 645          */
 646         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 647
 648         /* fill in the head */
 649         mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
 650         memset(mgmt, 0, hdr_len);
 651         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 652                                           IEEE80211_STYPE_BEACON);
 653         eth_broadcast_addr(mgmt->da);
 654         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 655         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 656         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 657         mgmt->u.beacon.beacon_int =
 658                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 659         mgmt->u.beacon.capab_info |= cpu_to_le16(
 660                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 661
 662         pos = skb_put(skb, 2);
 663         *pos++ = WLAN_EID_SSID;
 664         *pos++ = 0x0;
 665
 666         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 667             mesh_add_ds_params_ie(sdata, skb))
 668                 goto out_free;
 669
 670         bcn->head_len = skb->len;
 671         memcpy(bcn->head, skb->data, bcn->head_len);
 672
 673         /* now the tail */
 674         skb_trim(skb, 0);
 675         bcn->tail = bcn->head + bcn->head_len;
 676
 677         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 678             mesh_add_rsn_ie(sdata, skb) ||
 679             mesh_add_ht_cap_ie(sdata, skb) ||
 680             mesh_add_ht_oper_ie(sdata, skb) ||
 681             mesh_add_meshid_ie(sdata, skb) ||
 682             mesh_add_meshconf_ie(sdata, skb) ||
 683             mesh_add_awake_window_ie(sdata, skb) ||
 684             mesh_add_vendor_ies(sdata, skb))
 685                 goto out_free;
 686
 687         bcn->tail_len = skb->len;
 688         memcpy(bcn->tail, skb->data, bcn->tail_len);
 689
 690         dev_kfree_skb(skb);
 691         rcu_assign_pointer(ifmsh->beacon, bcn);
 692         return 0;
 693 out_free:
 694         kfree(bcn);
 695         dev_kfree_skb(skb);
 696         return -ENOMEM;
 697 }
 698
 699 static int
 700 ieee80211_mesh_rebuild_beacon(struct ieee80211_if_mesh *ifmsh)
 701 {
 702         struct ieee80211_sub_if_data *sdata;
 703         struct beacon_data *old_bcn;
 704         int ret;
 705         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 706
 707         mutex_lock(&ifmsh->mtx);
 708
 709         old_bcn = rcu_dereference_protected(ifmsh->beacon,
 710                                             lockdep_is_held(&ifmsh->mtx));
 711         ret = ieee80211_mesh_build_beacon(ifmsh);
 712         if (ret)
 713                 /* just reuse old beacon */
 714                 goto out;
 715
 716         if (old_bcn)
 717                 kfree_rcu(old_bcn, rcu_head);
 718 out:
 719         mutex_unlock(&ifmsh->mtx);
 720         return ret;
 721 }
 722
 723 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 724                                        u32 changed)
 725 {
 726         if (sdata->vif.bss_conf.enable_beacon &&
 727             (changed & (BSS_CHANGED_BEACON |
 728                         BSS_CHANGED_HT |
 729                         BSS_CHANGED_BASIC_RATES |
 730                         BSS_CHANGED_BEACON_INT)))
 731                 if (ieee80211_mesh_rebuild_beacon(&sdata->u.mesh))
 732                         return;
 733         ieee80211_bss_info_change_notify(sdata, changed);
 734 }
 735
 736 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 737 {
 738         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 739         struct ieee80211_local *local = sdata->local;
 740         u32 changed = BSS_CHANGED_BEACON |
 741                       BSS_CHANGED_BEACON_ENABLED |
 742                       BSS_CHANGED_HT |
 743                       BSS_CHANGED_BASIC_RATES |
 744                       BSS_CHANGED_BEACON_INT;
 745         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 746
 747         local->fif_other_bss++;
 748         /* mesh ifaces must set allmulti to forward mcast traffic */
 749         atomic_inc(&local->iff_allmultis);
 750         ieee80211_configure_filter(local);
 751
 752         ifmsh->mesh_cc_id = 0;  /* Disabled */
 753         ifmsh->mesh_auth_id = 0;        /* Disabled */
 754         /* register sync ops from extensible synchronization framework */
 755         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 756         ifmsh->adjusting_tbtt = false;
 757         ifmsh->sync_offset_clockdrift_max = 0;
 758         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 759         ieee80211_mesh_root_setup(ifmsh);
 760         ieee80211_queue_work(&local->hw, &sdata->work);
 761         sdata->vif.bss_conf.ht_operation_mode =
 762                                 ifmsh->mshcfg.ht_opmode;
 763         sdata->vif.bss_conf.enable_beacon = true;
 764         sdata->vif.bss_conf.basic_rates =
 765                 ieee80211_mandatory_rates(local, band);
 766
 767         changed |= ieee80211_mps_local_status_update(sdata);
 768
 769         if (ieee80211_mesh_build_beacon(ifmsh)) {
 770                 ieee80211_stop_mesh(sdata);
 771                 return -ENOMEM;
 772         }
 773
 774         ieee80211_bss_info_change_notify(sdata, changed);
 775
 776         netif_carrier_on(sdata->dev);
 777         return 0;
 778 }
 779
 780 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 781 {
 782         struct ieee80211_local *local = sdata->local;
 783         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 784         struct beacon_data *bcn;
 785
 786         netif_carrier_off(sdata->dev);
 787
 788         /* stop the beacon */
 789         ifmsh->mesh_id_len = 0;
 790         sdata->vif.bss_conf.enable_beacon = false;
 791         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 792         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 793         mutex_lock(&ifmsh->mtx);
 794         bcn = rcu_dereference_protected(ifmsh->beacon,
 795                                         lockdep_is_held(&ifmsh->mtx));
 796         rcu_assign_pointer(ifmsh->beacon, NULL);
 797         kfree_rcu(bcn, rcu_head);
 798         mutex_unlock(&ifmsh->mtx);
 799
 800         /* flush STAs and mpaths on this iface */
 801         sta_info_flush(sdata);
 802         mesh_path_flush_by_iface(sdata);
 803
 804         /* free all potentially still buffered group-addressed frames */
 805         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
 806         skb_queue_purge(&ifmsh->ps.bc_buf);
 807
 808         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 809         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 810         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 811         /*
 812          * If the timer fired while we waited for it, it will have
 813          * requeued the work. Now the work will be running again
 814          * but will not rearm the timer again because it checks
 815          * whether the interface is running, which, at this point,
 816          * it no longer is.
 817          */
 818         cancel_work_sync(&sdata->work);
 819
 820         local->fif_other_bss--;
 821         atomic_dec(&local->iff_allmultis);
 822         ieee80211_configure_filter(local);
 823 }
 824
 825 static void
 826 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
 827                             struct ieee80211_mgmt *mgmt, size_t len)
 828 {
 829         struct ieee80211_local *local = sdata->local;
 830         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 831         struct sk_buff *presp;
 832         struct beacon_data *bcn;
 833         struct ieee80211_mgmt *hdr;
 834         struct ieee802_11_elems elems;
 835         size_t baselen;
 836         u8 *pos, *end;
 837
 838         end = ((u8 *) mgmt) + len;
 839         pos = mgmt->u.probe_req.variable;
 840         baselen = (u8 *) pos - (u8 *) mgmt;
 841         if (baselen > len)
 842                 return;
 843
 844         ieee802_11_parse_elems(pos, len - baselen, &elems);
 845
 846         /* 802.11-2012 10.1.4.3.2 */
 847         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
 848              !is_broadcast_ether_addr(mgmt->da)) ||
 849             elems.ssid_len != 0)
 850                 return;
 851
 852         if (elems.mesh_id_len != 0 &&
 853             (elems.mesh_id_len != ifmsh->mesh_id_len ||
 854              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
 855                 return;
 856
 857         rcu_read_lock();
 858         bcn = rcu_dereference(ifmsh->beacon);
 859
 860         if (!bcn)
 861                 goto out;
 862
 863         presp = dev_alloc_skb(local->tx_headroom +
 864                               bcn->head_len + bcn->tail_len);
 865         if (!presp)
 866                 goto out;
 867
 868         skb_reserve(presp, local->tx_headroom);
 869         memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
 870         memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
 871         hdr = (struct ieee80211_mgmt *) presp->data;
 872         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 873                                          IEEE80211_STYPE_PROBE_RESP);
 874         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
 875         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 876         ieee80211_tx_skb(sdata, presp);
 877 out:
 878         rcu_read_unlock();
 879 }
 880
 881 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 882                                         u16 stype,
 883                                         struct ieee80211_mgmt *mgmt,
 884                                         size_t len,
 885                                         struct ieee80211_rx_status *rx_status)
 886 {
 887         struct ieee80211_local *local = sdata->local;
 888         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 889         struct ieee802_11_elems elems;
 890         struct ieee80211_channel *channel;
 891         size_t baselen;
 892         int freq;
 893         enum ieee80211_band band = rx_status->band;
 894
 895         /* ignore ProbeResp to foreign address */
 896         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 897             !ether_addr_equal(mgmt->da, sdata->vif.addr))
 898                 return;
 899
 900         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 901         if (baselen > len)
 902                 return;
 903
 904         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 905                                &elems);
 906
 907         /* ignore non-mesh or secure / unsecure mismatch */
 908         if ((!elems.mesh_id || !elems.mesh_config) ||
 909             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
 910             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
 911                 return;
 912
 913         if (elems.ds_params && elems.ds_params_len == 1)
 914                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 915         else
 916                 freq = rx_status->freq;
 917
 918         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 919
 920         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 921                 return;
 922
 923         if (mesh_matches_local(sdata, &elems))
 924                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 925
 926         if (ifmsh->sync_ops)
 927                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 928                         stype, mgmt, &elems, rx_status);
 929 }
 930
 931 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 932                                           struct ieee80211_mgmt *mgmt,
 933                                           size_t len,
 934                                           struct ieee80211_rx_status *rx_status)
 935 {
 936         switch (mgmt->u.action.category) {
 937         case WLAN_CATEGORY_SELF_PROTECTED:
 938                 switch (mgmt->u.action.u.self_prot.action_code) {
 939                 case WLAN_SP_MESH_PEERING_OPEN:
 940                 case WLAN_SP_MESH_PEERING_CLOSE:
 941                 case WLAN_SP_MESH_PEERING_CONFIRM:
 942                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 943                         break;
 944                 }
 945                 break;
 946         case WLAN_CATEGORY_MESH_ACTION:
 947                 if (mesh_action_is_path_sel(mgmt))
 948                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 949                 break;
 950         }
 951 }
 952
 953 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 954                                    struct sk_buff *skb)
 955 {
 956         struct ieee80211_rx_status *rx_status;
 957         struct ieee80211_mgmt *mgmt;
 958         u16 stype;
 959
 960         rx_status = IEEE80211_SKB_RXCB(skb);
 961         mgmt = (struct ieee80211_mgmt *) skb->data;
 962         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 963
 964         switch (stype) {
 965         case IEEE80211_STYPE_PROBE_RESP:
 966         case IEEE80211_STYPE_BEACON:
 967                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 968                                             rx_status);
 969                 break;
 970         case IEEE80211_STYPE_PROBE_REQ:
 971                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
 972                 break;
 973         case IEEE80211_STYPE_ACTION:
 974                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 975                 break;
 976         }
 977 }
 978
 979 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 980 {
 981         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 982
 983         if (ifmsh->preq_queue_len &&
 984             time_after(jiffies,
 985                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 986                 mesh_path_start_discovery(sdata);
 987
 988         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 989                 mesh_mpath_table_grow();
 990
 991         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 992                 mesh_mpp_table_grow();
 993
 994         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 995                 ieee80211_mesh_housekeeping(sdata);
 996
 997         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 998                 ieee80211_mesh_rootpath(sdata);
 999
1000         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1001                 mesh_sync_adjust_tbtt(sdata);
1002 }
1003
1004 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
1005 {
1006         struct ieee80211_sub_if_data *sdata;
1007
1008         rcu_read_lock();
1009         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1010                 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1011                     ieee80211_sdata_running(sdata))
1012                         ieee80211_queue_work(&local->hw, &sdata->work);
1013         rcu_read_unlock();
1014 }
1015
1016 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1017 {
1018         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1019         static u8 zero_addr[ETH_ALEN] = {};
1020
1021         setup_timer(&ifmsh->housekeeping_timer,
1022                     ieee80211_mesh_housekeeping_timer,
1023                     (unsigned long) sdata);
1024
1025         ifmsh->accepting_plinks = true;
1026         ifmsh->preq_id = 0;
1027         ifmsh->sn = 0;
1028         ifmsh->num_gates = 0;
1029         atomic_set(&ifmsh->mpaths, 0);
1030         mesh_rmc_init(sdata);
1031         ifmsh->last_preq = jiffies;
1032         ifmsh->next_perr = jiffies;
1033         /* Allocate all mesh structures when creating the first mesh interface. */
1034         if (!mesh_allocated)
1035                 ieee80211s_init();
1036         setup_timer(&ifmsh->mesh_path_timer,
1037                     ieee80211_mesh_path_timer,
1038                     (unsigned long) sdata);
1039         setup_timer(&ifmsh->mesh_path_root_timer,
1040                     ieee80211_mesh_path_root_timer,
1041                     (unsigned long) sdata);
1042         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1043         skb_queue_head_init(&ifmsh->ps.bc_buf);
1044         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1045         spin_lock_init(&ifmsh->sync_offset_lock);
1046         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1047         mutex_init(&ifmsh->mtx);
1048
1049         sdata->vif.bss_conf.bssid = zero_addr;
1050 }