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 #define TMR_RUNNING_HK  0
  17 #define TMR_RUNNING_MP  1
  18 #define TMR_RUNNING_MPR 2
  19
  20 static int mesh_allocated;
  21 static struct kmem_cache *rm_cache;
  22
  23 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  24 {
  25         return (mgmt->u.action.u.mesh_action.action_code ==
  26                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  27 }
  28
  29 void ieee80211s_init(void)
  30 {
  31         mesh_pathtbl_init();
  32         mesh_allocated = 1;
  33         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  34                                      0, 0, NULL);
  35 }
  36
  37 void ieee80211s_stop(void)
  38 {
  39         if (!mesh_allocated)
  40                 return;
  41         mesh_pathtbl_unregister();
  42         kmem_cache_destroy(rm_cache);
  43 }
  44
  45 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  46 {
  47         struct ieee80211_sub_if_data *sdata = (void *) data;
  48         struct ieee80211_local *local = sdata->local;
  49         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  50
  51         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  52
  53         if (local->quiescing) {
  54                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  55                 return;
  56         }
  57
  58         ieee80211_queue_work(&local->hw, &sdata->work);
  59 }
  60
  61 /**
  62  * mesh_matches_local - check if the config of a mesh point matches ours
  63  *
  64  * @sdata: local mesh subif
  65  * @ie: information elements of a management frame from the mesh peer
  66  *
  67  * This function checks if the mesh configuration of a mesh point matches the
  68  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  69  */
  70 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  71                         struct ieee802_11_elems *ie)
  72 {
  73         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  74         struct ieee80211_local *local = sdata->local;
  75         u32 basic_rates = 0;
  76         struct cfg80211_chan_def sta_chan_def;
  77
  78         /*
  79          * As support for each feature is added, check for matching
  80          * - On mesh config capabilities
  81          *   - Power Save Support En
  82          *   - Sync support enabled
  83          *   - Sync support active
  84          *   - Sync support required from peer
  85          *   - MDA enabled
  86          * - Power management control on fc
  87          */
  88         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  89              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  90              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  91              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  92              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  93              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  94              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  95                 return false;
  96
  97         ieee80211_sta_get_rates(local, ie, ieee80211_get_sdata_band(sdata),
  98                                 &basic_rates);
  99
 100         if (sdata->vif.bss_conf.basic_rates != basic_rates)
 101                 return false;
 102
 103         ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
 104                                      ie->ht_operation, &sta_chan_def);
 105
 106         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 107                                          &sta_chan_def))
 108                 return false;
 109
 110         return true;
 111 }
 112
 113 /**
 114  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 115  *
 116  * @ie: information elements of a management frame from the mesh peer
 117  */
 118 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 119 {
 120         return (ie->mesh_config->meshconf_cap &
 121                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 122 }
 123
 124 /**
 125  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 126  *
 127  * @sdata: mesh interface in which mesh beacons are going to be updated
 128  *
 129  * Returns: beacon changed flag if the beacon content changed.
 130  */
 131 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 132 {
 133         bool free_plinks;
 134         u32 changed = 0;
 135
 136         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 137          * the mesh interface might be able to establish plinks with peers that
 138          * are already on the table but are not on PLINK_ESTAB state. However,
 139          * in general the mesh interface is not accepting peer link requests
 140          * from new peers, and that must be reflected in the beacon
 141          */
 142         free_plinks = mesh_plink_availables(sdata);
 143
 144         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 145                 sdata->u.mesh.accepting_plinks = free_plinks;
 146                 changed = BSS_CHANGED_BEACON;
 147         }
 148
 149         return changed;
 150 }
 151
 152 /*
 153  * mesh_sta_cleanup - clean up any mesh sta state
 154  *
 155  * @sta: mesh sta to clean up.
 156  */
 157 void mesh_sta_cleanup(struct sta_info *sta)
 158 {
 159         struct ieee80211_sub_if_data *sdata = sta->sdata;
 160         u32 changed;
 161
 162         /*
 163          * maybe userspace handles peer allocation and peering, but in either
 164          * case the beacon is still generated by the kernel and we might need
 165          * an update.
 166          */
 167         changed = mesh_accept_plinks_update(sdata);
 168         if (sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
 169                 changed |= mesh_plink_deactivate(sta);
 170                 del_timer_sync(&sta->plink_timer);
 171         }
 172
 173         if (changed)
 174                 ieee80211_mbss_info_change_notify(sdata, changed);
 175 }
 176
 177 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 178 {
 179         int i;
 180
 181         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 182         if (!sdata->u.mesh.rmc)
 183                 return -ENOMEM;
 184         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 185         for (i = 0; i < RMC_BUCKETS; i++)
 186                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 187         return 0;
 188 }
 189
 190 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 191 {
 192         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 193         struct rmc_entry *p, *n;
 194         int i;
 195
 196         if (!sdata->u.mesh.rmc)
 197                 return;
 198
 199         for (i = 0; i < RMC_BUCKETS; i++) {
 200                 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 201                         list_del(&p->list);
 202                         kmem_cache_free(rm_cache, p);
 203                 }
 204         }
 205
 206         kfree(rmc);
 207         sdata->u.mesh.rmc = NULL;
 208 }
 209
 210 /**
 211  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 212  *
 213  * @sdata:      interface
 214  * @sa:         source address
 215  * @mesh_hdr:   mesh_header
 216  *
 217  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 218  *
 219  * Checks using the source address and the mesh sequence number if we have
 220  * received this frame lately. If the frame is not in the cache, it is added to
 221  * it.
 222  */
 223 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
 224                    const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 225 {
 226         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 227         u32 seqnum = 0;
 228         int entries = 0;
 229         u8 idx;
 230         struct rmc_entry *p, *n;
 231
 232         /* Don't care about endianness since only match matters */
 233         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 234         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 235         list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 236                 ++entries;
 237                 if (time_after(jiffies, p->exp_time) ||
 238                     entries == RMC_QUEUE_MAX_LEN) {
 239                         list_del(&p->list);
 240                         kmem_cache_free(rm_cache, p);
 241                         --entries;
 242                 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
 243                         return -1;
 244         }
 245
 246         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 247         if (!p)
 248                 return 0;
 249
 250         p->seqnum = seqnum;
 251         p->exp_time = jiffies + RMC_TIMEOUT;
 252         memcpy(p->sa, sa, ETH_ALEN);
 253         list_add(&p->list, &rmc->bucket[idx]);
 254         return 0;
 255 }
 256
 257 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
 258                          struct sk_buff *skb)
 259 {
 260         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 261         u8 *pos, neighbors;
 262         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 263
 264         if (skb_tailroom(skb) < 2 + meshconf_len)
 265                 return -ENOMEM;
 266
 267         pos = skb_put(skb, 2 + meshconf_len);
 268         *pos++ = WLAN_EID_MESH_CONFIG;
 269         *pos++ = meshconf_len;
 270
 271         /* Active path selection protocol ID */
 272         *pos++ = ifmsh->mesh_pp_id;
 273         /* Active path selection metric ID   */
 274         *pos++ = ifmsh->mesh_pm_id;
 275         /* Congestion control mode identifier */
 276         *pos++ = ifmsh->mesh_cc_id;
 277         /* Synchronization protocol identifier */
 278         *pos++ = ifmsh->mesh_sp_id;
 279         /* Authentication Protocol identifier */
 280         *pos++ = ifmsh->mesh_auth_id;
 281         /* Mesh Formation Info - number of neighbors */
 282         neighbors = atomic_read(&ifmsh->estab_plinks);
 283         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 284         neighbors = (neighbors > 15) ? 15 : neighbors;
 285         *pos++ = neighbors << 1;
 286         /* Mesh capability */
 287         *pos = IEEE80211_MESHCONF_CAPAB_FORWARDING;
 288         *pos |= ifmsh->accepting_plinks ?
 289                         IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 290         /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
 291         *pos |= ifmsh->ps_peers_deep_sleep ?
 292                         IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
 293         *pos++ |= ifmsh->adjusting_tbtt ?
 294                         IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 295         *pos++ = 0x00;
 296
 297         return 0;
 298 }
 299
 300 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 301 {
 302         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 303         u8 *pos;
 304
 305         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 306                 return -ENOMEM;
 307
 308         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 309         *pos++ = WLAN_EID_MESH_ID;
 310         *pos++ = ifmsh->mesh_id_len;
 311         if (ifmsh->mesh_id_len)
 312                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 313
 314         return 0;
 315 }
 316
 317 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
 318                                     struct sk_buff *skb)
 319 {
 320         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 321         u8 *pos;
 322
 323         /* see IEEE802.11-2012 13.14.6 */
 324         if (ifmsh->ps_peers_light_sleep == 0 &&
 325             ifmsh->ps_peers_deep_sleep == 0 &&
 326             ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
 327                 return 0;
 328
 329         if (skb_tailroom(skb) < 4)
 330                 return -ENOMEM;
 331
 332         pos = skb_put(skb, 2 + 2);
 333         *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
 334         *pos++ = 2;
 335         put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 336
 337         return 0;
 338 }
 339
 340 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
 341                         struct sk_buff *skb)
 342 {
 343         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 344         u8 offset, len;
 345         const u8 *data;
 346
 347         if (!ifmsh->ie || !ifmsh->ie_len)
 348                 return 0;
 349
 350         /* fast-forward to vendor IEs */
 351         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 352
 353         if (offset) {
 354                 len = ifmsh->ie_len - offset;
 355                 data = ifmsh->ie + offset;
 356                 if (skb_tailroom(skb) < len)
 357                         return -ENOMEM;
 358                 memcpy(skb_put(skb, len), data, len);
 359         }
 360
 361         return 0;
 362 }
 363
 364 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 365 {
 366         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 367         u8 len = 0;
 368         const u8 *data;
 369
 370         if (!ifmsh->ie || !ifmsh->ie_len)
 371                 return 0;
 372
 373         /* find RSN IE */
 374         data = ifmsh->ie;
 375         while (data < ifmsh->ie + ifmsh->ie_len) {
 376                 if (*data == WLAN_EID_RSN) {
 377                         len = data[1] + 2;
 378                         break;
 379                 }
 380                 data++;
 381         }
 382
 383         if (len) {
 384                 if (skb_tailroom(skb) < len)
 385                         return -ENOMEM;
 386                 memcpy(skb_put(skb, len), data, len);
 387         }
 388
 389         return 0;
 390 }
 391
 392 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
 393                                  struct sk_buff *skb)
 394 {
 395         struct ieee80211_chanctx_conf *chanctx_conf;
 396         struct ieee80211_channel *chan;
 397         u8 *pos;
 398
 399         if (skb_tailroom(skb) < 3)
 400                 return -ENOMEM;
 401
 402         rcu_read_lock();
 403         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 404         if (WARN_ON(!chanctx_conf)) {
 405                 rcu_read_unlock();
 406                 return -EINVAL;
 407         }
 408         chan = chanctx_conf->def.chan;
 409         rcu_read_unlock();
 410
 411         pos = skb_put(skb, 2 + 1);
 412         *pos++ = WLAN_EID_DS_PARAMS;
 413         *pos++ = 1;
 414         *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 415
 416         return 0;
 417 }
 418
 419 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
 420                        struct sk_buff *skb)
 421 {
 422         struct ieee80211_local *local = sdata->local;
 423         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 424         struct ieee80211_supported_band *sband;
 425         u8 *pos;
 426
 427         sband = local->hw.wiphy->bands[band];
 428         if (!sband->ht_cap.ht_supported ||
 429             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT)
 430                 return 0;
 431
 432         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 433                 return -ENOMEM;
 434
 435         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 436         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 437
 438         return 0;
 439 }
 440
 441 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
 442                         struct sk_buff *skb)
 443 {
 444         struct ieee80211_local *local = sdata->local;
 445         struct ieee80211_chanctx_conf *chanctx_conf;
 446         struct ieee80211_channel *channel;
 447         enum nl80211_channel_type channel_type =
 448                 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
 449         struct ieee80211_supported_band *sband;
 450         struct ieee80211_sta_ht_cap *ht_cap;
 451         u8 *pos;
 452
 453         rcu_read_lock();
 454         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 455         if (WARN_ON(!chanctx_conf)) {
 456                 rcu_read_unlock();
 457                 return -EINVAL;
 458         }
 459         channel = chanctx_conf->def.chan;
 460         rcu_read_unlock();
 461
 462         sband = local->hw.wiphy->bands[channel->band];
 463         ht_cap = &sband->ht_cap;
 464
 465         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 466                 return 0;
 467
 468         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 469                 return -ENOMEM;
 470
 471         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 472         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 473                                    sdata->vif.bss_conf.ht_operation_mode);
 474
 475         return 0;
 476 }
 477
 478 static void ieee80211_mesh_path_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         struct ieee80211_local *local = sdata->local;
 484
 485         if (local->quiescing) {
 486                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 487                 return;
 488         }
 489
 490         ieee80211_queue_work(&local->hw, &sdata->work);
 491 }
 492
 493 static void ieee80211_mesh_path_root_timer(unsigned long data)
 494 {
 495         struct ieee80211_sub_if_data *sdata =
 496                 (struct ieee80211_sub_if_data *) data;
 497         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 498         struct ieee80211_local *local = sdata->local;
 499
 500         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 501
 502         if (local->quiescing) {
 503                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 504                 return;
 505         }
 506
 507         ieee80211_queue_work(&local->hw, &sdata->work);
 508 }
 509
 510 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 511 {
 512         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 513                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 514         else {
 515                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 516                 /* stop running timer */
 517                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 518         }
 519 }
 520
 521 /**
 522  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 523  * @hdr:        802.11 frame header
 524  * @fc:         frame control field
 525  * @meshda:     destination address in the mesh
 526  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 527  *              locally originated.
 528  *
 529  * Return the length of the 802.11 (does not include a mesh control header)
 530  */
 531 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 532                                   const u8 *meshda, const u8 *meshsa)
 533 {
 534         if (is_multicast_ether_addr(meshda)) {
 535                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 536                 /* DA TA SA */
 537                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 538                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 539                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 540                 return 24;
 541         } else {
 542                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 543                 /* RA TA DA SA */
 544                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 545                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 546                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 547                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 548                 return 30;
 549         }
 550 }
 551
 552 /**
 553  * ieee80211_new_mesh_header - create a new mesh header
 554  * @sdata:      mesh interface to be used
 555  * @meshhdr:    uninitialized mesh header
 556  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 557  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 558  *              be NULL.
 559  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 560  *              mesh frame
 561  *
 562  * Return the header length.
 563  */
 564 int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
 565                               struct ieee80211s_hdr *meshhdr,
 566                               const char *addr4or5, const char *addr6)
 567 {
 568         if (WARN_ON(!addr4or5 && addr6))
 569                 return 0;
 570
 571         memset(meshhdr, 0, sizeof(*meshhdr));
 572
 573         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 574
 575         /* FIXME: racy -- TX on multiple queues can be concurrent */
 576         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 577         sdata->u.mesh.mesh_seqnum++;
 578
 579         if (addr4or5 && !addr6) {
 580                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 581                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 582                 return 2 * ETH_ALEN;
 583         } else if (addr4or5 && addr6) {
 584                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 585                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 586                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 587                 return 3 * ETH_ALEN;
 588         }
 589
 590         return ETH_ALEN;
 591 }
 592
 593 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 594 {
 595         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 596         u32 changed;
 597
 598         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 599         mesh_path_expire(sdata);
 600
 601         changed = mesh_accept_plinks_update(sdata);
 602         ieee80211_mbss_info_change_notify(sdata, changed);
 603
 604         mod_timer(&ifmsh->housekeeping_timer,
 605                   round_jiffies(jiffies +
 606                                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 607 }
 608
 609 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 610 {
 611         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 612         u32 interval;
 613
 614         mesh_path_tx_root_frame(sdata);
 615
 616         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 617                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 618         else
 619                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 620
 621         mod_timer(&ifmsh->mesh_path_root_timer,
 622                   round_jiffies(TU_TO_EXP_TIME(interval)));
 623 }
 624
 625 #ifdef CONFIG_PM
 626 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 627 {
 628         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 629
 630         /* use atomic bitops in case all timers fire at the same time */
 631
 632         if (del_timer_sync(&ifmsh->housekeeping_timer))
 633                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 634         if (del_timer_sync(&ifmsh->mesh_path_timer))
 635                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 636         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 637                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 638 }
 639
 640 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 641 {
 642         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 643
 644         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 645                 add_timer(&ifmsh->housekeeping_timer);
 646         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 647                 add_timer(&ifmsh->mesh_path_timer);
 648         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 649                 add_timer(&ifmsh->mesh_path_root_timer);
 650         ieee80211_mesh_root_setup(ifmsh);
 651 }
 652 #endif
 653
 654 static int
 655 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 656 {
 657         struct beacon_data *bcn;
 658         int head_len, tail_len;
 659         struct sk_buff *skb;
 660         struct ieee80211_mgmt *mgmt;
 661         struct ieee80211_chanctx_conf *chanctx_conf;
 662         enum ieee80211_band band;
 663         u8 *pos;
 664         struct ieee80211_sub_if_data *sdata;
 665         int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
 666                       sizeof(mgmt->u.beacon);
 667
 668         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 669         rcu_read_lock();
 670         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 671         band = chanctx_conf->def.chan->band;
 672         rcu_read_unlock();
 673
 674         head_len = hdr_len +
 675                    2 + /* NULL SSID */
 676                    2 + 8 + /* supported rates */
 677                    2 + 3; /* DS params */
 678         tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
 679                    2 + sizeof(struct ieee80211_ht_cap) +
 680                    2 + sizeof(struct ieee80211_ht_operation) +
 681                    2 + ifmsh->mesh_id_len +
 682                    2 + sizeof(struct ieee80211_meshconf_ie) +
 683                    2 + sizeof(__le16) + /* awake window */
 684                    ifmsh->ie_len;
 685
 686         bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
 687         /* need an skb for IE builders to operate on */
 688         skb = dev_alloc_skb(max(head_len, tail_len));
 689
 690         if (!bcn || !skb)
 691                 goto out_free;
 692
 693         /*
 694          * pointers go into the block we allocated,
 695          * memory is | beacon_data | head | tail |
 696          */
 697         bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 698
 699         /* fill in the head */
 700         mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
 701         memset(mgmt, 0, hdr_len);
 702         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 703                                           IEEE80211_STYPE_BEACON);
 704         eth_broadcast_addr(mgmt->da);
 705         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 706         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 707         ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
 708         mgmt->u.beacon.beacon_int =
 709                 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 710         mgmt->u.beacon.capab_info |= cpu_to_le16(
 711                 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 712
 713         pos = skb_put(skb, 2);
 714         *pos++ = WLAN_EID_SSID;
 715         *pos++ = 0x0;
 716
 717         if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
 718             mesh_add_ds_params_ie(sdata, skb))
 719                 goto out_free;
 720
 721         bcn->head_len = skb->len;
 722         memcpy(bcn->head, skb->data, bcn->head_len);
 723
 724         /* now the tail */
 725         skb_trim(skb, 0);
 726         bcn->tail = bcn->head + bcn->head_len;
 727
 728         if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
 729             mesh_add_rsn_ie(sdata, skb) ||
 730             mesh_add_ht_cap_ie(sdata, skb) ||
 731             mesh_add_ht_oper_ie(sdata, skb) ||
 732             mesh_add_meshid_ie(sdata, skb) ||
 733             mesh_add_meshconf_ie(sdata, skb) ||
 734             mesh_add_awake_window_ie(sdata, skb) ||
 735             mesh_add_vendor_ies(sdata, skb))
 736                 goto out_free;
 737
 738         bcn->tail_len = skb->len;
 739         memcpy(bcn->tail, skb->data, bcn->tail_len);
 740
 741         dev_kfree_skb(skb);
 742         rcu_assign_pointer(ifmsh->beacon, bcn);
 743         return 0;
 744 out_free:
 745         kfree(bcn);
 746         dev_kfree_skb(skb);
 747         return -ENOMEM;
 748 }
 749
 750 static int
 751 ieee80211_mesh_rebuild_beacon(struct ieee80211_if_mesh *ifmsh)
 752 {
 753         struct ieee80211_sub_if_data *sdata;
 754         struct beacon_data *old_bcn;
 755         int ret;
 756         sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 757
 758         mutex_lock(&ifmsh->mtx);
 759
 760         old_bcn = rcu_dereference_protected(ifmsh->beacon,
 761                                             lockdep_is_held(&ifmsh->mtx));
 762         ret = ieee80211_mesh_build_beacon(ifmsh);
 763         if (ret)
 764                 /* just reuse old beacon */
 765                 goto out;
 766
 767         if (old_bcn)
 768                 kfree_rcu(old_bcn, rcu_head);
 769 out:
 770         mutex_unlock(&ifmsh->mtx);
 771         return ret;
 772 }
 773
 774 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 775                                        u32 changed)
 776 {
 777         if (sdata->vif.bss_conf.enable_beacon &&
 778             (changed & (BSS_CHANGED_BEACON |
 779                         BSS_CHANGED_HT |
 780                         BSS_CHANGED_BASIC_RATES |
 781                         BSS_CHANGED_BEACON_INT)))
 782                 if (ieee80211_mesh_rebuild_beacon(&sdata->u.mesh))
 783                         return;
 784         ieee80211_bss_info_change_notify(sdata, changed);
 785 }
 786
 787 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 788 {
 789         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 790         struct ieee80211_local *local = sdata->local;
 791         u32 changed = BSS_CHANGED_BEACON |
 792                       BSS_CHANGED_BEACON_ENABLED |
 793                       BSS_CHANGED_HT |
 794                       BSS_CHANGED_BASIC_RATES |
 795                       BSS_CHANGED_BEACON_INT;
 796         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 797
 798         local->fif_other_bss++;
 799         /* mesh ifaces must set allmulti to forward mcast traffic */
 800         atomic_inc(&local->iff_allmultis);
 801         ieee80211_configure_filter(local);
 802
 803         ifmsh->mesh_cc_id = 0;  /* Disabled */
 804         ifmsh->mesh_auth_id = 0;        /* Disabled */
 805         /* register sync ops from extensible synchronization framework */
 806         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 807         ifmsh->adjusting_tbtt = false;
 808         ifmsh->sync_offset_clockdrift_max = 0;
 809         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 810         ieee80211_mesh_root_setup(ifmsh);
 811         ieee80211_queue_work(&local->hw, &sdata->work);
 812         sdata->vif.bss_conf.ht_operation_mode =
 813                                 ifmsh->mshcfg.ht_opmode;
 814         sdata->vif.bss_conf.enable_beacon = true;
 815         sdata->vif.bss_conf.basic_rates =
 816                 ieee80211_mandatory_rates(local, band);
 817
 818         changed |= ieee80211_mps_local_status_update(sdata);
 819
 820         if (ieee80211_mesh_build_beacon(ifmsh)) {
 821                 ieee80211_stop_mesh(sdata);
 822                 return -ENOMEM;
 823         }
 824
 825         ieee80211_bss_info_change_notify(sdata, changed);
 826
 827         netif_carrier_on(sdata->dev);
 828         return 0;
 829 }
 830
 831 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 832 {
 833         struct ieee80211_local *local = sdata->local;
 834         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 835         struct beacon_data *bcn;
 836
 837         netif_carrier_off(sdata->dev);
 838
 839         /* stop the beacon */
 840         ifmsh->mesh_id_len = 0;
 841         sdata->vif.bss_conf.enable_beacon = false;
 842         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 843         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 844         mutex_lock(&ifmsh->mtx);
 845         bcn = rcu_dereference_protected(ifmsh->beacon,
 846                                         lockdep_is_held(&ifmsh->mtx));
 847         rcu_assign_pointer(ifmsh->beacon, NULL);
 848         kfree_rcu(bcn, rcu_head);
 849         mutex_unlock(&ifmsh->mtx);
 850
 851         /* flush STAs and mpaths on this iface */
 852         sta_info_flush(sdata);
 853         mesh_path_flush_by_iface(sdata);
 854
 855         /* free all potentially still buffered group-addressed frames */
 856         local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
 857         skb_queue_purge(&ifmsh->ps.bc_buf);
 858
 859         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 860         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 861         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 862         /*
 863          * If the timer fired while we waited for it, it will have
 864          * requeued the work. Now the work will be running again
 865          * but will not rearm the timer again because it checks
 866          * whether the interface is running, which, at this point,
 867          * it no longer is.
 868          */
 869         cancel_work_sync(&sdata->work);
 870
 871         local->fif_other_bss--;
 872         atomic_dec(&local->iff_allmultis);
 873         ieee80211_configure_filter(local);
 874
 875         sdata->u.mesh.timers_running = 0;
 876 }
 877
 878 static void
 879 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
 880                             struct ieee80211_mgmt *mgmt, size_t len)
 881 {
 882         struct ieee80211_local *local = sdata->local;
 883         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 884         struct sk_buff *presp;
 885         struct beacon_data *bcn;
 886         struct ieee80211_mgmt *hdr;
 887         struct ieee802_11_elems elems;
 888         size_t baselen;
 889         u8 *pos, *end;
 890
 891         end = ((u8 *) mgmt) + len;
 892         pos = mgmt->u.probe_req.variable;
 893         baselen = (u8 *) pos - (u8 *) mgmt;
 894         if (baselen > len)
 895                 return;
 896
 897         ieee802_11_parse_elems(pos, len - baselen, &elems);
 898
 899         /* 802.11-2012 10.1.4.3.2 */
 900         if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
 901              !is_broadcast_ether_addr(mgmt->da)) ||
 902             elems.ssid_len != 0)
 903                 return;
 904
 905         if (elems.mesh_id_len != 0 &&
 906             (elems.mesh_id_len != ifmsh->mesh_id_len ||
 907              memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
 908                 return;
 909
 910         rcu_read_lock();
 911         bcn = rcu_dereference(ifmsh->beacon);
 912
 913         if (!bcn)
 914                 goto out;
 915
 916         presp = dev_alloc_skb(local->tx_headroom +
 917                               bcn->head_len + bcn->tail_len);
 918         if (!presp)
 919                 goto out;
 920
 921         skb_reserve(presp, local->tx_headroom);
 922         memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
 923         memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
 924         hdr = (struct ieee80211_mgmt *) presp->data;
 925         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 926                                          IEEE80211_STYPE_PROBE_RESP);
 927         memcpy(hdr->da, mgmt->sa, ETH_ALEN);
 928         IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 929         ieee80211_tx_skb(sdata, presp);
 930 out:
 931         rcu_read_unlock();
 932 }
 933
 934 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 935                                         u16 stype,
 936                                         struct ieee80211_mgmt *mgmt,
 937                                         size_t len,
 938                                         struct ieee80211_rx_status *rx_status)
 939 {
 940         struct ieee80211_local *local = sdata->local;
 941         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 942         struct ieee802_11_elems elems;
 943         struct ieee80211_channel *channel;
 944         size_t baselen;
 945         int freq;
 946         enum ieee80211_band band = rx_status->band;
 947
 948         /* ignore ProbeResp to foreign address */
 949         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 950             !ether_addr_equal(mgmt->da, sdata->vif.addr))
 951                 return;
 952
 953         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 954         if (baselen > len)
 955                 return;
 956
 957         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 958                                &elems);
 959
 960         /* ignore non-mesh or secure / unsecure mismatch */
 961         if ((!elems.mesh_id || !elems.mesh_config) ||
 962             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
 963             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
 964                 return;
 965
 966         if (elems.ds_params && elems.ds_params_len == 1)
 967                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 968         else
 969                 freq = rx_status->freq;
 970
 971         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 972
 973         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 974                 return;
 975
 976         if (mesh_matches_local(sdata, &elems))
 977                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 978
 979         if (ifmsh->sync_ops)
 980                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 981                         stype, mgmt, &elems, rx_status);
 982 }
 983
 984 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 985                                           struct ieee80211_mgmt *mgmt,
 986                                           size_t len,
 987                                           struct ieee80211_rx_status *rx_status)
 988 {
 989         switch (mgmt->u.action.category) {
 990         case WLAN_CATEGORY_SELF_PROTECTED:
 991                 switch (mgmt->u.action.u.self_prot.action_code) {
 992                 case WLAN_SP_MESH_PEERING_OPEN:
 993                 case WLAN_SP_MESH_PEERING_CLOSE:
 994                 case WLAN_SP_MESH_PEERING_CONFIRM:
 995                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 996                         break;
 997                 }
 998                 break;
 999         case WLAN_CATEGORY_MESH_ACTION:
1000                 if (mesh_action_is_path_sel(mgmt))
1001                         mesh_rx_path_sel_frame(sdata, mgmt, len);
1002                 break;
1003         }
1004 }
1005
1006 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1007                                    struct sk_buff *skb)
1008 {
1009         struct ieee80211_rx_status *rx_status;
1010         struct ieee80211_mgmt *mgmt;
1011         u16 stype;
1012
1013         rx_status = IEEE80211_SKB_RXCB(skb);
1014         mgmt = (struct ieee80211_mgmt *) skb->data;
1015         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1016
1017         switch (stype) {
1018         case IEEE80211_STYPE_PROBE_RESP:
1019         case IEEE80211_STYPE_BEACON:
1020                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1021                                             rx_status);
1022                 break;
1023         case IEEE80211_STYPE_PROBE_REQ:
1024                 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1025                 break;
1026         case IEEE80211_STYPE_ACTION:
1027                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1028                 break;
1029         }
1030 }
1031
1032 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1033 {
1034         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1035
1036         if (ifmsh->preq_queue_len &&
1037             time_after(jiffies,
1038                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1039                 mesh_path_start_discovery(sdata);
1040
1041         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
1042                 mesh_mpath_table_grow();
1043
1044         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
1045                 mesh_mpp_table_grow();
1046
1047         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1048                 ieee80211_mesh_housekeeping(sdata);
1049
1050         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1051                 ieee80211_mesh_rootpath(sdata);
1052
1053         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1054                 mesh_sync_adjust_tbtt(sdata);
1055 }
1056
1057 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
1058 {
1059         struct ieee80211_sub_if_data *sdata;
1060
1061         rcu_read_lock();
1062         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1063                 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1064                     ieee80211_sdata_running(sdata))
1065                         ieee80211_queue_work(&local->hw, &sdata->work);
1066         rcu_read_unlock();
1067 }
1068
1069 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1070 {
1071         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1072         static u8 zero_addr[ETH_ALEN] = {};
1073
1074         setup_timer(&ifmsh->housekeeping_timer,
1075                     ieee80211_mesh_housekeeping_timer,
1076                     (unsigned long) sdata);
1077
1078         ifmsh->accepting_plinks = true;
1079         ifmsh->preq_id = 0;
1080         ifmsh->sn = 0;
1081         ifmsh->num_gates = 0;
1082         atomic_set(&ifmsh->mpaths, 0);
1083         mesh_rmc_init(sdata);
1084         ifmsh->last_preq = jiffies;
1085         ifmsh->next_perr = jiffies;
1086         /* Allocate all mesh structures when creating the first mesh interface. */
1087         if (!mesh_allocated)
1088                 ieee80211s_init();
1089         setup_timer(&ifmsh->mesh_path_timer,
1090                     ieee80211_mesh_path_timer,
1091                     (unsigned long) sdata);
1092         setup_timer(&ifmsh->mesh_path_root_timer,
1093                     ieee80211_mesh_path_root_timer,
1094                     (unsigned long) sdata);
1095         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1096         skb_queue_head_init(&ifmsh->ps.bc_buf);
1097         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1098         spin_lock_init(&ifmsh->sync_offset_lock);
1099         RCU_INIT_POINTER(ifmsh->beacon, NULL);
1100         mutex_init(&ifmsh->mtx);
1101
1102         sdata->vif.bss_conf.bssid = zero_addr;
1103 }