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 int mesh_allocated;
  21 static struct kmem_cache *rm_cache;
  22
  23 #ifdef CONFIG_MAC80211_MESH
  24 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  25 {
  26         return (mgmt->u.action.u.mesh_action.action_code ==
  27                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  28 }
  29 #else
  30 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  31 { return false; }
  32 #endif
  33
  34 void ieee80211s_init(void)
  35 {
  36         mesh_pathtbl_init();
  37         mesh_allocated = 1;
  38         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  39                                      0, 0, NULL);
  40 }
  41
  42 void ieee80211s_stop(void)
  43 {
  44         mesh_pathtbl_unregister();
  45         kmem_cache_destroy(rm_cache);
  46 }
  47
  48 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  49 {
  50         struct ieee80211_sub_if_data *sdata = (void *) data;
  51         struct ieee80211_local *local = sdata->local;
  52         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  53
  54         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  55
  56         if (local->quiescing) {
  57                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  58                 return;
  59         }
  60
  61         ieee80211_queue_work(&local->hw, &sdata->work);
  62 }
  63
  64 /**
  65  * mesh_matches_local - check if the config of a mesh point matches ours
  66  *
  67  * @sdata: local mesh subif
  68  * @ie: information elements of a management frame from the mesh peer
  69  *
  70  * This function checks if the mesh configuration of a mesh point matches the
  71  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  72  */
  73 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  74                         struct ieee802_11_elems *ie)
  75 {
  76         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  77         struct ieee80211_local *local = sdata->local;
  78         u32 basic_rates = 0;
  79         struct cfg80211_chan_def sta_chan_def;
  80
  81         /*
  82          * As support for each feature is added, check for matching
  83          * - On mesh config capabilities
  84          *   - Power Save Support En
  85          *   - Sync support enabled
  86          *   - Sync support active
  87          *   - Sync support required from peer
  88          *   - MDA enabled
  89          * - Power management control on fc
  90          */
  91         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  92              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  93              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  94              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  95              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  96              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  97              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  98                 goto mismatch;
  99
 100         ieee80211_sta_get_rates(local, ie, ieee80211_get_sdata_band(sdata),
 101                                 &basic_rates);
 102
 103         if (sdata->vif.bss_conf.basic_rates != basic_rates)
 104                 goto mismatch;
 105
 106         ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
 107                                      ie->ht_operation, &sta_chan_def);
 108
 109         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 110                                          &sta_chan_def))
 111                 goto mismatch;
 112
 113         return true;
 114 mismatch:
 115         return false;
 116 }
 117
 118 /**
 119  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 120  *
 121  * @ie: information elements of a management frame from the mesh peer
 122  */
 123 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 124 {
 125         return (ie->mesh_config->meshconf_cap &
 126             IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 127 }
 128
 129 /**
 130  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 131  *
 132  * @sdata: mesh interface in which mesh beacons are going to be updated
 133  *
 134  * Returns: beacon changed flag if the beacon content changed.
 135  */
 136 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 137 {
 138         bool free_plinks;
 139         u32 changed = 0;
 140
 141         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 142          * the mesh interface might be able to establish plinks with peers that
 143          * are already on the table but are not on PLINK_ESTAB state. However,
 144          * in general the mesh interface is not accepting peer link requests
 145          * from new peers, and that must be reflected in the beacon
 146          */
 147         free_plinks = mesh_plink_availables(sdata);
 148
 149         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 150                 sdata->u.mesh.accepting_plinks = free_plinks;
 151                 changed = BSS_CHANGED_BEACON;
 152         }
 153
 154         return changed;
 155 }
 156
 157 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 158 {
 159         int i;
 160
 161         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 162         if (!sdata->u.mesh.rmc)
 163                 return -ENOMEM;
 164         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 165         for (i = 0; i < RMC_BUCKETS; i++)
 166                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 167         return 0;
 168 }
 169
 170 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 171 {
 172         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 173         struct rmc_entry *p, *n;
 174         int i;
 175
 176         if (!sdata->u.mesh.rmc)
 177                 return;
 178
 179         for (i = 0; i < RMC_BUCKETS; i++)
 180                 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 181                         list_del(&p->list);
 182                         kmem_cache_free(rm_cache, p);
 183                 }
 184
 185         kfree(rmc);
 186         sdata->u.mesh.rmc = NULL;
 187 }
 188
 189 /**
 190  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 191  *
 192  * @sa:         source address
 193  * @mesh_hdr:   mesh_header
 194  *
 195  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 196  *
 197  * Checks using the source address and the mesh sequence number if we have
 198  * received this frame lately. If the frame is not in the cache, it is added to
 199  * it.
 200  */
 201 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 202                    struct ieee80211_sub_if_data *sdata)
 203 {
 204         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 205         u32 seqnum = 0;
 206         int entries = 0;
 207         u8 idx;
 208         struct rmc_entry *p, *n;
 209
 210         /* Don't care about endianness since only match matters */
 211         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 212         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 213         list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 214                 ++entries;
 215                 if (time_after(jiffies, p->exp_time) ||
 216                                 (entries == RMC_QUEUE_MAX_LEN)) {
 217                         list_del(&p->list);
 218                         kmem_cache_free(rm_cache, p);
 219                         --entries;
 220                 } else if ((seqnum == p->seqnum) &&
 221                            (ether_addr_equal(sa, p->sa)))
 222                         return -1;
 223         }
 224
 225         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 226         if (!p)
 227                 return 0;
 228
 229         p->seqnum = seqnum;
 230         p->exp_time = jiffies + RMC_TIMEOUT;
 231         memcpy(p->sa, sa, ETH_ALEN);
 232         list_add(&p->list, &rmc->bucket[idx]);
 233         return 0;
 234 }
 235
 236 int
 237 mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 238 {
 239         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 240         u8 *pos, neighbors;
 241         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 242
 243         if (skb_tailroom(skb) < 2 + meshconf_len)
 244                 return -ENOMEM;
 245
 246         pos = skb_put(skb, 2 + meshconf_len);
 247         *pos++ = WLAN_EID_MESH_CONFIG;
 248         *pos++ = meshconf_len;
 249
 250         /* Active path selection protocol ID */
 251         *pos++ = ifmsh->mesh_pp_id;
 252         /* Active path selection metric ID   */
 253         *pos++ = ifmsh->mesh_pm_id;
 254         /* Congestion control mode identifier */
 255         *pos++ = ifmsh->mesh_cc_id;
 256         /* Synchronization protocol identifier */
 257         *pos++ = ifmsh->mesh_sp_id;
 258         /* Authentication Protocol identifier */
 259         *pos++ = ifmsh->mesh_auth_id;
 260         /* Mesh Formation Info - number of neighbors */
 261         neighbors = atomic_read(&ifmsh->estab_plinks);
 262         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 263         neighbors = (neighbors > 15) ? 15 : neighbors;
 264         *pos++ = neighbors << 1;
 265         /* Mesh capability */
 266         *pos = IEEE80211_MESHCONF_CAPAB_FORWARDING;
 267         *pos |= ifmsh->accepting_plinks ?
 268             IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 269         *pos++ |= ifmsh->adjusting_tbtt ?
 270             IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 271         *pos++ = 0x00;
 272
 273         return 0;
 274 }
 275
 276 int
 277 mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 278 {
 279         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 280         u8 *pos;
 281
 282         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 283                 return -ENOMEM;
 284
 285         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 286         *pos++ = WLAN_EID_MESH_ID;
 287         *pos++ = ifmsh->mesh_id_len;
 288         if (ifmsh->mesh_id_len)
 289                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 290
 291         return 0;
 292 }
 293
 294 int
 295 mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 296 {
 297         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 298         u8 offset, len;
 299         const u8 *data;
 300
 301         if (!ifmsh->ie || !ifmsh->ie_len)
 302                 return 0;
 303
 304         /* fast-forward to vendor IEs */
 305         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 306
 307         if (offset) {
 308                 len = ifmsh->ie_len - offset;
 309                 data = ifmsh->ie + offset;
 310                 if (skb_tailroom(skb) < len)
 311                         return -ENOMEM;
 312                 memcpy(skb_put(skb, len), data, len);
 313         }
 314
 315         return 0;
 316 }
 317
 318 int
 319 mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 320 {
 321         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 322         u8 len = 0;
 323         const u8 *data;
 324
 325         if (!ifmsh->ie || !ifmsh->ie_len)
 326                 return 0;
 327
 328         /* find RSN IE */
 329         data = ifmsh->ie;
 330         while (data < ifmsh->ie + ifmsh->ie_len) {
 331                 if (*data == WLAN_EID_RSN) {
 332                         len = data[1] + 2;
 333                         break;
 334                 }
 335                 data++;
 336         }
 337
 338         if (len) {
 339                 if (skb_tailroom(skb) < len)
 340                         return -ENOMEM;
 341                 memcpy(skb_put(skb, len), data, len);
 342         }
 343
 344         return 0;
 345 }
 346
 347 int mesh_add_ds_params_ie(struct sk_buff *skb,
 348                           struct ieee80211_sub_if_data *sdata)
 349 {
 350         struct ieee80211_local *local = sdata->local;
 351         struct ieee80211_supported_band *sband;
 352         struct ieee80211_chanctx_conf *chanctx_conf;
 353         struct ieee80211_channel *chan;
 354         u8 *pos;
 355
 356         if (skb_tailroom(skb) < 3)
 357                 return -ENOMEM;
 358
 359         rcu_read_lock();
 360         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 361         if (WARN_ON(!chanctx_conf)) {
 362                 rcu_read_unlock();
 363                 return -EINVAL;
 364         }
 365         chan = chanctx_conf->def.chan;
 366         rcu_read_unlock();
 367
 368         sband = local->hw.wiphy->bands[chan->band];
 369         if (sband->band == IEEE80211_BAND_2GHZ) {
 370                 pos = skb_put(skb, 2 + 1);
 371                 *pos++ = WLAN_EID_DS_PARAMS;
 372                 *pos++ = 1;
 373                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 374         }
 375
 376         return 0;
 377 }
 378
 379 int mesh_add_ht_cap_ie(struct sk_buff *skb,
 380                        struct ieee80211_sub_if_data *sdata)
 381 {
 382         struct ieee80211_local *local = sdata->local;
 383         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 384         struct ieee80211_supported_band *sband;
 385         u8 *pos;
 386
 387         sband = local->hw.wiphy->bands[band];
 388         if (!sband->ht_cap.ht_supported ||
 389             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT)
 390                 return 0;
 391
 392         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 393                 return -ENOMEM;
 394
 395         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 396         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 397
 398         return 0;
 399 }
 400
 401 int mesh_add_ht_oper_ie(struct sk_buff *skb,
 402                         struct ieee80211_sub_if_data *sdata)
 403 {
 404         struct ieee80211_local *local = sdata->local;
 405         struct ieee80211_chanctx_conf *chanctx_conf;
 406         struct ieee80211_channel *channel;
 407         enum nl80211_channel_type channel_type =
 408                 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
 409         struct ieee80211_supported_band *sband;
 410         struct ieee80211_sta_ht_cap *ht_cap;
 411         u8 *pos;
 412
 413         rcu_read_lock();
 414         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 415         if (WARN_ON(!chanctx_conf)) {
 416                 rcu_read_unlock();
 417                 return -EINVAL;
 418         }
 419         channel = chanctx_conf->def.chan;
 420         rcu_read_unlock();
 421
 422         sband = local->hw.wiphy->bands[channel->band];
 423         ht_cap = &sband->ht_cap;
 424
 425         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 426                 return 0;
 427
 428         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 429                 return -ENOMEM;
 430
 431         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 432         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 433                                    sdata->vif.bss_conf.ht_operation_mode);
 434
 435         return 0;
 436 }
 437 static void ieee80211_mesh_path_timer(unsigned long data)
 438 {
 439         struct ieee80211_sub_if_data *sdata =
 440                 (struct ieee80211_sub_if_data *) data;
 441         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 442         struct ieee80211_local *local = sdata->local;
 443
 444         if (local->quiescing) {
 445                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 446                 return;
 447         }
 448
 449         ieee80211_queue_work(&local->hw, &sdata->work);
 450 }
 451
 452 static void ieee80211_mesh_path_root_timer(unsigned long data)
 453 {
 454         struct ieee80211_sub_if_data *sdata =
 455                 (struct ieee80211_sub_if_data *) data;
 456         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 457         struct ieee80211_local *local = sdata->local;
 458
 459         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 460
 461         if (local->quiescing) {
 462                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 463                 return;
 464         }
 465
 466         ieee80211_queue_work(&local->hw, &sdata->work);
 467 }
 468
 469 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 470 {
 471         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 472                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 473         else {
 474                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 475                 /* stop running timer */
 476                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 477         }
 478 }
 479
 480 /**
 481  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 482  * @hdr:        802.11 frame header
 483  * @fc:         frame control field
 484  * @meshda:     destination address in the mesh
 485  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 486  *              locally originated.
 487  *
 488  * Return the length of the 802.11 (does not include a mesh control header)
 489  */
 490 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 491                                   const u8 *meshda, const u8 *meshsa)
 492 {
 493         if (is_multicast_ether_addr(meshda)) {
 494                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 495                 /* DA TA SA */
 496                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 497                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 498                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 499                 return 24;
 500         } else {
 501                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 502                 /* RA TA DA SA */
 503                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 504                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 505                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 506                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 507                 return 30;
 508         }
 509 }
 510
 511 /**
 512  * ieee80211_new_mesh_header - create a new mesh header
 513  * @meshhdr:    uninitialized mesh header
 514  * @sdata:      mesh interface to be used
 515  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 516  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 517  *              be NULL.
 518  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 519  *              mesh frame
 520  *
 521  * Return the header length.
 522  */
 523 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 524                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 525                 char *addr6)
 526 {
 527         int aelen = 0;
 528         BUG_ON(!addr4or5 && addr6);
 529         memset(meshhdr, 0, sizeof(*meshhdr));
 530         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 531         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 532         sdata->u.mesh.mesh_seqnum++;
 533         if (addr4or5 && !addr6) {
 534                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 535                 aelen += ETH_ALEN;
 536                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 537         } else if (addr4or5 && addr6) {
 538                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 539                 aelen += 2 * ETH_ALEN;
 540                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 541                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 542         }
 543         return 6 + aelen;
 544 }
 545
 546 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 547                            struct ieee80211_if_mesh *ifmsh)
 548 {
 549         u32 changed;
 550
 551         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 552         mesh_path_expire(sdata);
 553
 554         changed = mesh_accept_plinks_update(sdata);
 555         ieee80211_bss_info_change_notify(sdata, changed);
 556
 557         mod_timer(&ifmsh->housekeeping_timer,
 558                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 559 }
 560
 561 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 562 {
 563         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 564         u32 interval;
 565
 566         mesh_path_tx_root_frame(sdata);
 567
 568         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 569                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 570         else
 571                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 572
 573         mod_timer(&ifmsh->mesh_path_root_timer,
 574                   round_jiffies(TU_TO_EXP_TIME(interval)));
 575 }
 576
 577 #ifdef CONFIG_PM
 578 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 579 {
 580         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 581
 582         /* use atomic bitops in case all timers fire at the same time */
 583
 584         if (del_timer_sync(&ifmsh->housekeeping_timer))
 585                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 586         if (del_timer_sync(&ifmsh->mesh_path_timer))
 587                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 588         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 589                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 590 }
 591
 592 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 593 {
 594         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 595
 596         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 597                 add_timer(&ifmsh->housekeeping_timer);
 598         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 599                 add_timer(&ifmsh->mesh_path_timer);
 600         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 601                 add_timer(&ifmsh->mesh_path_root_timer);
 602         ieee80211_mesh_root_setup(ifmsh);
 603 }
 604 #endif
 605
 606 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 607 {
 608         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 609         struct ieee80211_local *local = sdata->local;
 610
 611         local->fif_other_bss++;
 612         /* mesh ifaces must set allmulti to forward mcast traffic */
 613         atomic_inc(&local->iff_allmultis);
 614         ieee80211_configure_filter(local);
 615
 616         ifmsh->mesh_cc_id = 0;  /* Disabled */
 617         ifmsh->mesh_auth_id = 0;        /* Disabled */
 618         /* register sync ops from extensible synchronization framework */
 619         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 620         ifmsh->adjusting_tbtt = false;
 621         ifmsh->sync_offset_clockdrift_max = 0;
 622         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 623         ieee80211_mesh_root_setup(ifmsh);
 624         ieee80211_queue_work(&local->hw, &sdata->work);
 625         sdata->vif.bss_conf.ht_operation_mode =
 626                                 ifmsh->mshcfg.ht_opmode;
 627         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 628         sdata->vif.bss_conf.basic_rates =
 629                 ieee80211_mandatory_rates(sdata->local,
 630                                           ieee80211_get_sdata_band(sdata));
 631         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 632                                                 BSS_CHANGED_BEACON_ENABLED |
 633                                                 BSS_CHANGED_HT |
 634                                                 BSS_CHANGED_BASIC_RATES |
 635                                                 BSS_CHANGED_BEACON_INT);
 636
 637         netif_carrier_on(sdata->dev);
 638 }
 639
 640 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 641 {
 642         struct ieee80211_local *local = sdata->local;
 643         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 644
 645         netif_carrier_off(sdata->dev);
 646
 647         /* stop the beacon */
 648         ifmsh->mesh_id_len = 0;
 649         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 650
 651         /* flush STAs and mpaths on this iface */
 652         sta_info_flush(sdata->local, sdata);
 653         mesh_path_flush_by_iface(sdata);
 654
 655         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 656         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 657         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 658         /*
 659          * If the timer fired while we waited for it, it will have
 660          * requeued the work. Now the work will be running again
 661          * but will not rearm the timer again because it checks
 662          * whether the interface is running, which, at this point,
 663          * it no longer is.
 664          */
 665         cancel_work_sync(&sdata->work);
 666
 667         local->fif_other_bss--;
 668         atomic_dec(&local->iff_allmultis);
 669         ieee80211_configure_filter(local);
 670
 671         sdata->u.mesh.timers_running = 0;
 672 }
 673
 674 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 675                                         u16 stype,
 676                                         struct ieee80211_mgmt *mgmt,
 677                                         size_t len,
 678                                         struct ieee80211_rx_status *rx_status)
 679 {
 680         struct ieee80211_local *local = sdata->local;
 681         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 682         struct ieee802_11_elems elems;
 683         struct ieee80211_channel *channel;
 684         size_t baselen;
 685         int freq;
 686         enum ieee80211_band band = rx_status->band;
 687
 688         /* ignore ProbeResp to foreign address */
 689         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 690             !ether_addr_equal(mgmt->da, sdata->vif.addr))
 691                 return;
 692
 693         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 694         if (baselen > len)
 695                 return;
 696
 697         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 698                                &elems);
 699
 700         /* ignore non-mesh or secure / unsecure mismatch */
 701         if ((!elems.mesh_id || !elems.mesh_config) ||
 702             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
 703             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
 704                 return;
 705
 706         if (elems.ds_params && elems.ds_params_len == 1)
 707                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 708         else
 709                 freq = rx_status->freq;
 710
 711         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 712
 713         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 714                 return;
 715
 716         if (mesh_matches_local(sdata, &elems))
 717                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 718
 719         if (ifmsh->sync_ops)
 720                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 721                         stype, mgmt, &elems, rx_status);
 722 }
 723
 724 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 725                                           struct ieee80211_mgmt *mgmt,
 726                                           size_t len,
 727                                           struct ieee80211_rx_status *rx_status)
 728 {
 729         switch (mgmt->u.action.category) {
 730         case WLAN_CATEGORY_SELF_PROTECTED:
 731                 switch (mgmt->u.action.u.self_prot.action_code) {
 732                 case WLAN_SP_MESH_PEERING_OPEN:
 733                 case WLAN_SP_MESH_PEERING_CLOSE:
 734                 case WLAN_SP_MESH_PEERING_CONFIRM:
 735                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 736                         break;
 737                 }
 738                 break;
 739         case WLAN_CATEGORY_MESH_ACTION:
 740                 if (mesh_action_is_path_sel(mgmt))
 741                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 742                 break;
 743         }
 744 }
 745
 746 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 747                                    struct sk_buff *skb)
 748 {
 749         struct ieee80211_rx_status *rx_status;
 750         struct ieee80211_mgmt *mgmt;
 751         u16 stype;
 752
 753         rx_status = IEEE80211_SKB_RXCB(skb);
 754         mgmt = (struct ieee80211_mgmt *) skb->data;
 755         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 756
 757         switch (stype) {
 758         case IEEE80211_STYPE_PROBE_RESP:
 759         case IEEE80211_STYPE_BEACON:
 760                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 761                                             rx_status);
 762                 break;
 763         case IEEE80211_STYPE_ACTION:
 764                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 765                 break;
 766         }
 767 }
 768
 769 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 770 {
 771         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 772
 773         if (ifmsh->preq_queue_len &&
 774             time_after(jiffies,
 775                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 776                 mesh_path_start_discovery(sdata);
 777
 778         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 779                 mesh_mpath_table_grow();
 780
 781         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 782                 mesh_mpp_table_grow();
 783
 784         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 785                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 786
 787         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 788                 ieee80211_mesh_rootpath(sdata);
 789
 790         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
 791                 mesh_sync_adjust_tbtt(sdata);
 792 }
 793
 794 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 795 {
 796         struct ieee80211_sub_if_data *sdata;
 797
 798         rcu_read_lock();
 799         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 800                 if (ieee80211_vif_is_mesh(&sdata->vif))
 801                         ieee80211_queue_work(&local->hw, &sdata->work);
 802         rcu_read_unlock();
 803 }
 804
 805 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 806 {
 807         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 808
 809         setup_timer(&ifmsh->housekeeping_timer,
 810                     ieee80211_mesh_housekeeping_timer,
 811                     (unsigned long) sdata);
 812
 813         ifmsh->accepting_plinks = true;
 814         ifmsh->preq_id = 0;
 815         ifmsh->sn = 0;
 816         ifmsh->num_gates = 0;
 817         atomic_set(&ifmsh->mpaths, 0);
 818         mesh_rmc_init(sdata);
 819         ifmsh->last_preq = jiffies;
 820         ifmsh->next_perr = jiffies;
 821         /* Allocate all mesh structures when creating the first mesh interface. */
 822         if (!mesh_allocated)
 823                 ieee80211s_init();
 824         setup_timer(&ifmsh->mesh_path_timer,
 825                     ieee80211_mesh_path_timer,
 826                     (unsigned long) sdata);
 827         setup_timer(&ifmsh->mesh_path_root_timer,
 828                     ieee80211_mesh_path_root_timer,
 829                     (unsigned long) sdata);
 830         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 831         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 832         spin_lock_init(&ifmsh->sync_offset_lock);
 833 }