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         enum nl80211_channel_type sta_channel_type = NL80211_CHAN_NO_HT;
  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, local->oper_channel->band,
 101                                 &basic_rates);
 102
 103         if (sdata->vif.bss_conf.basic_rates != basic_rates)
 104                 goto mismatch;
 105
 106         if (ie->ht_operation)
 107                 sta_channel_type =
 108                         ieee80211_ht_oper_to_channel_type(ie->ht_operation);
 109
 110         /* Disallow HT40+/- mismatch */
 111         if (ie->ht_operation &&
 112             (local->_oper_channel_type == NL80211_CHAN_HT40MINUS ||
 113             local->_oper_channel_type == NL80211_CHAN_HT40PLUS) &&
 114             (sta_channel_type == NL80211_CHAN_HT40MINUS ||
 115              sta_channel_type == NL80211_CHAN_HT40PLUS) &&
 116             local->_oper_channel_type != sta_channel_type)
 117                 goto mismatch;
 118
 119         return true;
 120 mismatch:
 121         return false;
 122 }
 123
 124 /**
 125  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 126  *
 127  * @ie: information elements of a management frame from the mesh peer
 128  */
 129 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 130 {
 131         return (ie->mesh_config->meshconf_cap &
 132             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 133 }
 134
 135 /**
 136  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 137  *
 138  * @sdata: mesh interface in which mesh beacons are going to be updated
 139  *
 140  * Returns: beacon changed flag if the beacon content changed.
 141  */
 142 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 143 {
 144         bool free_plinks;
 145         u32 changed = 0;
 146
 147         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 148          * the mesh interface might be able to establish plinks with peers that
 149          * are already on the table but are not on PLINK_ESTAB state. However,
 150          * in general the mesh interface is not accepting peer link requests
 151          * from new peers, and that must be reflected in the beacon
 152          */
 153         free_plinks = mesh_plink_availables(sdata);
 154
 155         if (free_plinks != sdata->u.mesh.accepting_plinks) {
 156                 sdata->u.mesh.accepting_plinks = free_plinks;
 157                 changed = BSS_CHANGED_BEACON;
 158         }
 159
 160         return changed;
 161 }
 162
 163 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 164 {
 165         int i;
 166
 167         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 168         if (!sdata->u.mesh.rmc)
 169                 return -ENOMEM;
 170         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 171         for (i = 0; i < RMC_BUCKETS; i++)
 172                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 173         return 0;
 174 }
 175
 176 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 177 {
 178         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 179         struct rmc_entry *p, *n;
 180         int i;
 181
 182         if (!sdata->u.mesh.rmc)
 183                 return;
 184
 185         for (i = 0; i < RMC_BUCKETS; i++)
 186                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 187                         list_del(&p->list);
 188                         kmem_cache_free(rm_cache, p);
 189                 }
 190
 191         kfree(rmc);
 192         sdata->u.mesh.rmc = NULL;
 193 }
 194
 195 /**
 196  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 197  *
 198  * @sa:         source address
 199  * @mesh_hdr:   mesh_header
 200  *
 201  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 202  *
 203  * Checks using the source address and the mesh sequence number if we have
 204  * received this frame lately. If the frame is not in the cache, it is added to
 205  * it.
 206  */
 207 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 208                    struct ieee80211_sub_if_data *sdata)
 209 {
 210         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 211         u32 seqnum = 0;
 212         int entries = 0;
 213         u8 idx;
 214         struct rmc_entry *p, *n;
 215
 216         /* Don't care about endianness since only match matters */
 217         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 218         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 219         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 220                 ++entries;
 221                 if (time_after(jiffies, p->exp_time) ||
 222                                 (entries == RMC_QUEUE_MAX_LEN)) {
 223                         list_del(&p->list);
 224                         kmem_cache_free(rm_cache, p);
 225                         --entries;
 226                 } else if ((seqnum == p->seqnum) &&
 227                            (ether_addr_equal(sa, p->sa)))
 228                         return -1;
 229         }
 230
 231         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 232         if (!p)
 233                 return 0;
 234
 235         p->seqnum = seqnum;
 236         p->exp_time = jiffies + RMC_TIMEOUT;
 237         memcpy(p->sa, sa, ETH_ALEN);
 238         list_add(&p->list, &rmc->bucket[idx].list);
 239         return 0;
 240 }
 241
 242 int
 243 mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 244 {
 245         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 246         u8 *pos, neighbors;
 247         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 248
 249         if (skb_tailroom(skb) < 2 + meshconf_len)
 250                 return -ENOMEM;
 251
 252         pos = skb_put(skb, 2 + meshconf_len);
 253         *pos++ = WLAN_EID_MESH_CONFIG;
 254         *pos++ = meshconf_len;
 255
 256         /* Active path selection protocol ID */
 257         *pos++ = ifmsh->mesh_pp_id;
 258         /* Active path selection metric ID   */
 259         *pos++ = ifmsh->mesh_pm_id;
 260         /* Congestion control mode identifier */
 261         *pos++ = ifmsh->mesh_cc_id;
 262         /* Synchronization protocol identifier */
 263         *pos++ = ifmsh->mesh_sp_id;
 264         /* Authentication Protocol identifier */
 265         *pos++ = ifmsh->mesh_auth_id;
 266         /* Mesh Formation Info - number of neighbors */
 267         neighbors = atomic_read(&ifmsh->mshstats.estab_plinks);
 268         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 269         neighbors = (neighbors > 15) ? 15 : neighbors;
 270         *pos++ = neighbors << 1;
 271         /* Mesh capability */
 272         *pos = MESHCONF_CAPAB_FORWARDING;
 273         *pos |= ifmsh->accepting_plinks ?
 274             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 275         *pos++ |= ifmsh->adjusting_tbtt ?
 276             MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 277         *pos++ = 0x00;
 278
 279         return 0;
 280 }
 281
 282 int
 283 mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 284 {
 285         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 286         u8 *pos;
 287
 288         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 289                 return -ENOMEM;
 290
 291         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 292         *pos++ = WLAN_EID_MESH_ID;
 293         *pos++ = ifmsh->mesh_id_len;
 294         if (ifmsh->mesh_id_len)
 295                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 296
 297         return 0;
 298 }
 299
 300 int
 301 mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 302 {
 303         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 304         u8 offset, len;
 305         const u8 *data;
 306
 307         if (!ifmsh->ie || !ifmsh->ie_len)
 308                 return 0;
 309
 310         /* fast-forward to vendor IEs */
 311         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 312
 313         if (offset) {
 314                 len = ifmsh->ie_len - offset;
 315                 data = ifmsh->ie + offset;
 316                 if (skb_tailroom(skb) < len)
 317                         return -ENOMEM;
 318                 memcpy(skb_put(skb, len), data, len);
 319         }
 320
 321         return 0;
 322 }
 323
 324 int
 325 mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 326 {
 327         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 328         u8 len = 0;
 329         const u8 *data;
 330
 331         if (!ifmsh->ie || !ifmsh->ie_len)
 332                 return 0;
 333
 334         /* find RSN IE */
 335         data = ifmsh->ie;
 336         while (data < ifmsh->ie + ifmsh->ie_len) {
 337                 if (*data == WLAN_EID_RSN) {
 338                         len = data[1] + 2;
 339                         break;
 340                 }
 341                 data++;
 342         }
 343
 344         if (len) {
 345                 if (skb_tailroom(skb) < len)
 346                         return -ENOMEM;
 347                 memcpy(skb_put(skb, len), data, len);
 348         }
 349
 350         return 0;
 351 }
 352
 353 int mesh_add_ds_params_ie(struct sk_buff *skb,
 354                           struct ieee80211_sub_if_data *sdata)
 355 {
 356         struct ieee80211_local *local = sdata->local;
 357         struct ieee80211_supported_band *sband;
 358         u8 *pos;
 359
 360         if (skb_tailroom(skb) < 3)
 361                 return -ENOMEM;
 362
 363         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 364         if (sband->band == IEEE80211_BAND_2GHZ) {
 365                 pos = skb_put(skb, 2 + 1);
 366                 *pos++ = WLAN_EID_DS_PARAMS;
 367                 *pos++ = 1;
 368                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 369         }
 370
 371         return 0;
 372 }
 373
 374 int mesh_add_ht_cap_ie(struct sk_buff *skb,
 375                        struct ieee80211_sub_if_data *sdata)
 376 {
 377         struct ieee80211_local *local = sdata->local;
 378         struct ieee80211_supported_band *sband;
 379         u8 *pos;
 380
 381         sband = local->hw.wiphy->bands[local->oper_channel->band];
 382         if (!sband->ht_cap.ht_supported ||
 383             local->_oper_channel_type == NL80211_CHAN_NO_HT)
 384                 return 0;
 385
 386         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 387                 return -ENOMEM;
 388
 389         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 390         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 391
 392         return 0;
 393 }
 394
 395 int mesh_add_ht_oper_ie(struct sk_buff *skb,
 396                         struct ieee80211_sub_if_data *sdata)
 397 {
 398         struct ieee80211_local *local = sdata->local;
 399         struct ieee80211_channel *channel = local->oper_channel;
 400         enum nl80211_channel_type channel_type = local->_oper_channel_type;
 401         struct ieee80211_supported_band *sband =
 402                                 local->hw.wiphy->bands[channel->band];
 403         struct ieee80211_sta_ht_cap *ht_cap = &sband->ht_cap;
 404         u8 *pos;
 405
 406         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 407                 return 0;
 408
 409         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 410                 return -ENOMEM;
 411
 412         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 413         ieee80211_ie_build_ht_oper(pos, ht_cap, channel, channel_type,
 414                                    sdata->vif.bss_conf.ht_operation_mode);
 415
 416         return 0;
 417 }
 418 static void ieee80211_mesh_path_timer(unsigned long data)
 419 {
 420         struct ieee80211_sub_if_data *sdata =
 421                 (struct ieee80211_sub_if_data *) data;
 422         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 423         struct ieee80211_local *local = sdata->local;
 424
 425         if (local->quiescing) {
 426                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 427                 return;
 428         }
 429
 430         ieee80211_queue_work(&local->hw, &sdata->work);
 431 }
 432
 433 static void ieee80211_mesh_path_root_timer(unsigned long data)
 434 {
 435         struct ieee80211_sub_if_data *sdata =
 436                 (struct ieee80211_sub_if_data *) data;
 437         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 438         struct ieee80211_local *local = sdata->local;
 439
 440         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 441
 442         if (local->quiescing) {
 443                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 444                 return;
 445         }
 446
 447         ieee80211_queue_work(&local->hw, &sdata->work);
 448 }
 449
 450 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 451 {
 452         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 453                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 454         else {
 455                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 456                 /* stop running timer */
 457                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 458         }
 459 }
 460
 461 /**
 462  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 463  * @hdr:        802.11 frame header
 464  * @fc:         frame control field
 465  * @meshda:     destination address in the mesh
 466  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 467  *              locally originated.
 468  *
 469  * Return the length of the 802.11 (does not include a mesh control header)
 470  */
 471 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 472                                   const u8 *meshda, const u8 *meshsa)
 473 {
 474         if (is_multicast_ether_addr(meshda)) {
 475                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 476                 /* DA TA SA */
 477                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 478                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 479                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 480                 return 24;
 481         } else {
 482                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 483                 /* RA TA DA SA */
 484                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 485                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 486                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 487                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 488                 return 30;
 489         }
 490 }
 491
 492 /**
 493  * ieee80211_new_mesh_header - create a new mesh header
 494  * @meshhdr:    uninitialized mesh header
 495  * @sdata:      mesh interface to be used
 496  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 497  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 498  *              be NULL.
 499  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 500  *              mesh frame
 501  *
 502  * Return the header length.
 503  */
 504 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 505                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 506                 char *addr6)
 507 {
 508         int aelen = 0;
 509         BUG_ON(!addr4or5 && addr6);
 510         memset(meshhdr, 0, sizeof(*meshhdr));
 511         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 512         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 513         sdata->u.mesh.mesh_seqnum++;
 514         if (addr4or5 && !addr6) {
 515                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 516                 aelen += ETH_ALEN;
 517                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 518         } else if (addr4or5 && addr6) {
 519                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 520                 aelen += 2 * ETH_ALEN;
 521                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 522                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 523         }
 524         return 6 + aelen;
 525 }
 526
 527 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 528                            struct ieee80211_if_mesh *ifmsh)
 529 {
 530         u32 changed;
 531
 532         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 533         mesh_path_expire(sdata);
 534
 535         changed = mesh_accept_plinks_update(sdata);
 536         ieee80211_bss_info_change_notify(sdata, changed);
 537
 538         mod_timer(&ifmsh->housekeeping_timer,
 539                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 540 }
 541
 542 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 543 {
 544         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 545         u32 interval;
 546
 547         mesh_path_tx_root_frame(sdata);
 548
 549         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 550                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 551         else
 552                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 553
 554         mod_timer(&ifmsh->mesh_path_root_timer,
 555                   round_jiffies(TU_TO_EXP_TIME(interval)));
 556 }
 557
 558 #ifdef CONFIG_PM
 559 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 560 {
 561         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 562
 563         /* use atomic bitops in case all timers fire at the same time */
 564
 565         if (del_timer_sync(&ifmsh->housekeeping_timer))
 566                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 567         if (del_timer_sync(&ifmsh->mesh_path_timer))
 568                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 569         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 570                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 571 }
 572
 573 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 574 {
 575         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 576
 577         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 578                 add_timer(&ifmsh->housekeeping_timer);
 579         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 580                 add_timer(&ifmsh->mesh_path_timer);
 581         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 582                 add_timer(&ifmsh->mesh_path_root_timer);
 583         ieee80211_mesh_root_setup(ifmsh);
 584 }
 585 #endif
 586
 587 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 588 {
 589         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 590         struct ieee80211_local *local = sdata->local;
 591
 592         local->fif_other_bss++;
 593         /* mesh ifaces must set allmulti to forward mcast traffic */
 594         atomic_inc(&local->iff_allmultis);
 595         ieee80211_configure_filter(local);
 596
 597         ifmsh->mesh_cc_id = 0;  /* Disabled */
 598         ifmsh->mesh_auth_id = 0;        /* Disabled */
 599         /* register sync ops from extensible synchronization framework */
 600         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 601         ifmsh->adjusting_tbtt = false;
 602         ifmsh->sync_offset_clockdrift_max = 0;
 603         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 604         ieee80211_mesh_root_setup(ifmsh);
 605         ieee80211_queue_work(&local->hw, &sdata->work);
 606         sdata->vif.bss_conf.ht_operation_mode =
 607                                 ifmsh->mshcfg.ht_opmode;
 608         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 609         sdata->vif.bss_conf.basic_rates =
 610                 ieee80211_mandatory_rates(sdata->local,
 611                                           sdata->local->hw.conf.channel->band);
 612         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 613                                                 BSS_CHANGED_BEACON_ENABLED |
 614                                                 BSS_CHANGED_HT |
 615                                                 BSS_CHANGED_BASIC_RATES |
 616                                                 BSS_CHANGED_BEACON_INT);
 617 }
 618
 619 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 620 {
 621         struct ieee80211_local *local = sdata->local;
 622         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 623
 624         ifmsh->mesh_id_len = 0;
 625         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 626         sta_info_flush(local, NULL);
 627
 628         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 629         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 630         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 631         /*
 632          * If the timer fired while we waited for it, it will have
 633          * requeued the work. Now the work will be running again
 634          * but will not rearm the timer again because it checks
 635          * whether the interface is running, which, at this point,
 636          * it no longer is.
 637          */
 638         cancel_work_sync(&sdata->work);
 639
 640         local->fif_other_bss--;
 641         atomic_dec(&local->iff_allmultis);
 642         ieee80211_configure_filter(local);
 643
 644         sdata->u.mesh.timers_running = 0;
 645 }
 646
 647 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 648                                         u16 stype,
 649                                         struct ieee80211_mgmt *mgmt,
 650                                         size_t len,
 651                                         struct ieee80211_rx_status *rx_status)
 652 {
 653         struct ieee80211_local *local = sdata->local;
 654         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 655         struct ieee802_11_elems elems;
 656         struct ieee80211_channel *channel;
 657         size_t baselen;
 658         int freq;
 659         enum ieee80211_band band = rx_status->band;
 660
 661         /* ignore ProbeResp to foreign address */
 662         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 663             !ether_addr_equal(mgmt->da, sdata->vif.addr))
 664                 return;
 665
 666         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 667         if (baselen > len)
 668                 return;
 669
 670         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 671                                &elems);
 672
 673         /* ignore beacons from secure mesh peers if our security is off */
 674         if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
 675                 return;
 676
 677         if (elems.ds_params && elems.ds_params_len == 1)
 678                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 679         else
 680                 freq = rx_status->freq;
 681
 682         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 683
 684         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 685                 return;
 686
 687         if (elems.mesh_id && elems.mesh_config &&
 688             mesh_matches_local(sdata, &elems))
 689                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 690
 691         if (ifmsh->sync_ops)
 692                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 693                         stype, mgmt, &elems, rx_status);
 694 }
 695
 696 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 697                                           struct ieee80211_mgmt *mgmt,
 698                                           size_t len,
 699                                           struct ieee80211_rx_status *rx_status)
 700 {
 701         switch (mgmt->u.action.category) {
 702         case WLAN_CATEGORY_SELF_PROTECTED:
 703                 switch (mgmt->u.action.u.self_prot.action_code) {
 704                 case WLAN_SP_MESH_PEERING_OPEN:
 705                 case WLAN_SP_MESH_PEERING_CLOSE:
 706                 case WLAN_SP_MESH_PEERING_CONFIRM:
 707                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 708                         break;
 709                 }
 710                 break;
 711         case WLAN_CATEGORY_MESH_ACTION:
 712                 if (mesh_action_is_path_sel(mgmt))
 713                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 714                 break;
 715         }
 716 }
 717
 718 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 719                                    struct sk_buff *skb)
 720 {
 721         struct ieee80211_rx_status *rx_status;
 722         struct ieee80211_mgmt *mgmt;
 723         u16 stype;
 724
 725         rx_status = IEEE80211_SKB_RXCB(skb);
 726         mgmt = (struct ieee80211_mgmt *) skb->data;
 727         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 728
 729         switch (stype) {
 730         case IEEE80211_STYPE_PROBE_RESP:
 731         case IEEE80211_STYPE_BEACON:
 732                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 733                                             rx_status);
 734                 break;
 735         case IEEE80211_STYPE_ACTION:
 736                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 737                 break;
 738         }
 739 }
 740
 741 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 742 {
 743         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 744
 745         if (ifmsh->preq_queue_len &&
 746             time_after(jiffies,
 747                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 748                 mesh_path_start_discovery(sdata);
 749
 750         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 751                 mesh_mpath_table_grow();
 752
 753         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 754                 mesh_mpp_table_grow();
 755
 756         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 757                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 758
 759         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 760                 ieee80211_mesh_rootpath(sdata);
 761
 762         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
 763                 mesh_sync_adjust_tbtt(sdata);
 764 }
 765
 766 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 767 {
 768         struct ieee80211_sub_if_data *sdata;
 769
 770         rcu_read_lock();
 771         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 772                 if (ieee80211_vif_is_mesh(&sdata->vif))
 773                         ieee80211_queue_work(&local->hw, &sdata->work);
 774         rcu_read_unlock();
 775 }
 776
 777 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 778 {
 779         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 780
 781         setup_timer(&ifmsh->housekeeping_timer,
 782                     ieee80211_mesh_housekeeping_timer,
 783                     (unsigned long) sdata);
 784
 785         ifmsh->accepting_plinks = true;
 786         ifmsh->preq_id = 0;
 787         ifmsh->sn = 0;
 788         ifmsh->num_gates = 0;
 789         atomic_set(&ifmsh->mpaths, 0);
 790         mesh_rmc_init(sdata);
 791         ifmsh->last_preq = jiffies;
 792         ifmsh->next_perr = jiffies;
 793         /* Allocate all mesh structures when creating the first mesh interface. */
 794         if (!mesh_allocated)
 795                 ieee80211s_init();
 796         setup_timer(&ifmsh->mesh_path_timer,
 797                     ieee80211_mesh_path_timer,
 798                     (unsigned long) sdata);
 799         setup_timer(&ifmsh->mesh_path_root_timer,
 800                     ieee80211_mesh_path_root_timer,
 801                     (unsigned long) sdata);
 802         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 803         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 804         spin_lock_init(&ifmsh->sync_offset_lock);
 805 }