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             (sdata->vif.bss_conf.channel_type == NL80211_CHAN_HT40MINUS ||
 113              sdata->vif.bss_conf.channel_type == NL80211_CHAN_HT40PLUS) &&
 114             (sta_channel_type == NL80211_CHAN_HT40MINUS ||
 115              sta_channel_type == NL80211_CHAN_HT40PLUS) &&
 116             sdata->vif.bss_conf.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 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 141 {
 142         bool free_plinks;
 143
 144         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 145          * the mesh interface might be able to establish plinks with peers that
 146          * are already on the table but are not on PLINK_ESTAB state. However,
 147          * in general the mesh interface is not accepting peer link requests
 148          * from new peers, and that must be reflected in the beacon
 149          */
 150         free_plinks = mesh_plink_availables(sdata);
 151
 152         if (free_plinks != sdata->u.mesh.accepting_plinks)
 153                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 154 }
 155
 156 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 157 {
 158         int i;
 159
 160         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 161         if (!sdata->u.mesh.rmc)
 162                 return -ENOMEM;
 163         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 164         for (i = 0; i < RMC_BUCKETS; i++)
 165                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 166         return 0;
 167 }
 168
 169 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 170 {
 171         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 172         struct rmc_entry *p, *n;
 173         int i;
 174
 175         if (!sdata->u.mesh.rmc)
 176                 return;
 177
 178         for (i = 0; i < RMC_BUCKETS; i++)
 179                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 180                         list_del(&p->list);
 181                         kmem_cache_free(rm_cache, p);
 182                 }
 183
 184         kfree(rmc);
 185         sdata->u.mesh.rmc = NULL;
 186 }
 187
 188 /**
 189  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 190  *
 191  * @sa:         source address
 192  * @mesh_hdr:   mesh_header
 193  *
 194  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 195  *
 196  * Checks using the source address and the mesh sequence number if we have
 197  * received this frame lately. If the frame is not in the cache, it is added to
 198  * it.
 199  */
 200 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 201                    struct ieee80211_sub_if_data *sdata)
 202 {
 203         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 204         u32 seqnum = 0;
 205         int entries = 0;
 206         u8 idx;
 207         struct rmc_entry *p, *n;
 208
 209         /* Don't care about endianness since only match matters */
 210         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 211         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 212         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 213                 ++entries;
 214                 if (time_after(jiffies, p->exp_time) ||
 215                                 (entries == RMC_QUEUE_MAX_LEN)) {
 216                         list_del(&p->list);
 217                         kmem_cache_free(rm_cache, p);
 218                         --entries;
 219                 } else if ((seqnum == p->seqnum) &&
 220                            (ether_addr_equal(sa, p->sa)))
 221                         return -1;
 222         }
 223
 224         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 225         if (!p)
 226                 return 0;
 227
 228         p->seqnum = seqnum;
 229         p->exp_time = jiffies + RMC_TIMEOUT;
 230         memcpy(p->sa, sa, ETH_ALEN);
 231         list_add(&p->list, &rmc->bucket[idx].list);
 232         return 0;
 233 }
 234
 235 int
 236 mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 237 {
 238         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 239         u8 *pos, neighbors;
 240         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 241
 242         if (skb_tailroom(skb) < 2 + meshconf_len)
 243                 return -ENOMEM;
 244
 245         pos = skb_put(skb, 2 + meshconf_len);
 246         *pos++ = WLAN_EID_MESH_CONFIG;
 247         *pos++ = meshconf_len;
 248
 249         /* Active path selection protocol ID */
 250         *pos++ = ifmsh->mesh_pp_id;
 251         /* Active path selection metric ID   */
 252         *pos++ = ifmsh->mesh_pm_id;
 253         /* Congestion control mode identifier */
 254         *pos++ = ifmsh->mesh_cc_id;
 255         /* Synchronization protocol identifier */
 256         *pos++ = ifmsh->mesh_sp_id;
 257         /* Authentication Protocol identifier */
 258         *pos++ = ifmsh->mesh_auth_id;
 259         /* Mesh Formation Info - number of neighbors */
 260         neighbors = atomic_read(&ifmsh->mshstats.estab_plinks);
 261         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 262         neighbors = (neighbors > 15) ? 15 : neighbors;
 263         *pos++ = neighbors << 1;
 264         /* Mesh capability */
 265         ifmsh->accepting_plinks = mesh_plink_availables(sdata);
 266         *pos = MESHCONF_CAPAB_FORWARDING;
 267         *pos |= ifmsh->accepting_plinks ?
 268             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 269         *pos++ |= ifmsh->adjusting_tbtt ?
 270             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_channel *chan = local->oper_channel;
 353         u8 *pos;
 354
 355         if (skb_tailroom(skb) < 3)
 356                 return -ENOMEM;
 357
 358         sband = local->hw.wiphy->bands[chan->band];
 359         if (sband->band == IEEE80211_BAND_2GHZ) {
 360                 pos = skb_put(skb, 2 + 1);
 361                 *pos++ = WLAN_EID_DS_PARAMS;
 362                 *pos++ = 1;
 363                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 364         }
 365
 366         return 0;
 367 }
 368
 369 int mesh_add_ht_cap_ie(struct sk_buff *skb,
 370                        struct ieee80211_sub_if_data *sdata)
 371 {
 372         struct ieee80211_local *local = sdata->local;
 373         struct ieee80211_supported_band *sband;
 374         u8 *pos;
 375
 376         sband = local->hw.wiphy->bands[local->oper_channel->band];
 377         if (!sband->ht_cap.ht_supported ||
 378             sdata->vif.bss_conf.channel_type == NL80211_CHAN_NO_HT)
 379                 return 0;
 380
 381         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 382                 return -ENOMEM;
 383
 384         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 385         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 386
 387         return 0;
 388 }
 389
 390 int mesh_add_ht_oper_ie(struct sk_buff *skb,
 391                         struct ieee80211_sub_if_data *sdata)
 392 {
 393         struct ieee80211_local *local = sdata->local;
 394         struct ieee80211_channel *channel = local->oper_channel;
 395         enum nl80211_channel_type channel_type =
 396                                 sdata->vif.bss_conf.channel_type;
 397         struct ieee80211_supported_band *sband =
 398                                 local->hw.wiphy->bands[channel->band];
 399         struct ieee80211_sta_ht_cap *ht_cap = &sband->ht_cap;
 400         u8 *pos;
 401
 402         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 403                 return 0;
 404
 405         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 406                 return -ENOMEM;
 407
 408         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 409         ieee80211_ie_build_ht_oper(pos, ht_cap, channel, channel_type,
 410                                    sdata->vif.bss_conf.ht_operation_mode);
 411
 412         return 0;
 413 }
 414 static void ieee80211_mesh_path_timer(unsigned long data)
 415 {
 416         struct ieee80211_sub_if_data *sdata =
 417                 (struct ieee80211_sub_if_data *) data;
 418         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 419         struct ieee80211_local *local = sdata->local;
 420
 421         if (local->quiescing) {
 422                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 423                 return;
 424         }
 425
 426         ieee80211_queue_work(&local->hw, &sdata->work);
 427 }
 428
 429 static void ieee80211_mesh_path_root_timer(unsigned long data)
 430 {
 431         struct ieee80211_sub_if_data *sdata =
 432                 (struct ieee80211_sub_if_data *) data;
 433         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 434         struct ieee80211_local *local = sdata->local;
 435
 436         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 437
 438         if (local->quiescing) {
 439                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 440                 return;
 441         }
 442
 443         ieee80211_queue_work(&local->hw, &sdata->work);
 444 }
 445
 446 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 447 {
 448         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 449                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 450         else {
 451                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 452                 /* stop running timer */
 453                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 454         }
 455 }
 456
 457 /**
 458  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 459  * @hdr:        802.11 frame header
 460  * @fc:         frame control field
 461  * @meshda:     destination address in the mesh
 462  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 463  *              locally originated.
 464  *
 465  * Return the length of the 802.11 (does not include a mesh control header)
 466  */
 467 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 468                                   const u8 *meshda, const u8 *meshsa)
 469 {
 470         if (is_multicast_ether_addr(meshda)) {
 471                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 472                 /* DA TA SA */
 473                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 474                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 475                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 476                 return 24;
 477         } else {
 478                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 479                 /* RA TA DA SA */
 480                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 481                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 482                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 483                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 484                 return 30;
 485         }
 486 }
 487
 488 /**
 489  * ieee80211_new_mesh_header - create a new mesh header
 490  * @meshhdr:    uninitialized mesh header
 491  * @sdata:      mesh interface to be used
 492  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 493  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 494  *              be NULL.
 495  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 496  *              mesh frame
 497  *
 498  * Return the header length.
 499  */
 500 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 501                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 502                 char *addr6)
 503 {
 504         int aelen = 0;
 505         BUG_ON(!addr4or5 && addr6);
 506         memset(meshhdr, 0, sizeof(*meshhdr));
 507         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 508         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 509         sdata->u.mesh.mesh_seqnum++;
 510         if (addr4or5 && !addr6) {
 511                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 512                 aelen += ETH_ALEN;
 513                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 514         } else if (addr4or5 && addr6) {
 515                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 516                 aelen += 2 * ETH_ALEN;
 517                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 518                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 519         }
 520         return 6 + aelen;
 521 }
 522
 523 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 524                            struct ieee80211_if_mesh *ifmsh)
 525 {
 526         bool free_plinks;
 527
 528         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 529         mesh_path_expire(sdata);
 530
 531         free_plinks = mesh_plink_availables(sdata);
 532         if (free_plinks != sdata->u.mesh.accepting_plinks)
 533                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 534
 535         mod_timer(&ifmsh->housekeeping_timer,
 536                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 537 }
 538
 539 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 540 {
 541         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 542         u32 interval;
 543
 544         mesh_path_tx_root_frame(sdata);
 545
 546         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 547                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 548         else
 549                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 550
 551         mod_timer(&ifmsh->mesh_path_root_timer,
 552                   round_jiffies(TU_TO_EXP_TIME(interval)));
 553 }
 554
 555 #ifdef CONFIG_PM
 556 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 557 {
 558         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 559
 560         /* use atomic bitops in case all timers fire at the same time */
 561
 562         if (del_timer_sync(&ifmsh->housekeeping_timer))
 563                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 564         if (del_timer_sync(&ifmsh->mesh_path_timer))
 565                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 566         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 567                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 568 }
 569
 570 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 571 {
 572         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 573
 574         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 575                 add_timer(&ifmsh->housekeeping_timer);
 576         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 577                 add_timer(&ifmsh->mesh_path_timer);
 578         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 579                 add_timer(&ifmsh->mesh_path_root_timer);
 580         ieee80211_mesh_root_setup(ifmsh);
 581 }
 582 #endif
 583
 584 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 585 {
 586         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 587         struct ieee80211_local *local = sdata->local;
 588
 589         local->fif_other_bss++;
 590         /* mesh ifaces must set allmulti to forward mcast traffic */
 591         atomic_inc(&local->iff_allmultis);
 592         ieee80211_configure_filter(local);
 593
 594         ifmsh->mesh_cc_id = 0;  /* Disabled */
 595         ifmsh->mesh_auth_id = 0;        /* Disabled */
 596         /* register sync ops from extensible synchronization framework */
 597         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 598         ifmsh->adjusting_tbtt = false;
 599         ifmsh->sync_offset_clockdrift_max = 0;
 600         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 601         ieee80211_mesh_root_setup(ifmsh);
 602         ieee80211_queue_work(&local->hw, &sdata->work);
 603         sdata->vif.bss_conf.ht_operation_mode =
 604                                 ifmsh->mshcfg.ht_opmode;
 605         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 606         sdata->vif.bss_conf.basic_rates =
 607                 ieee80211_mandatory_rates(sdata->local,
 608                                           sdata->local->oper_channel->band);
 609         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 610                                                 BSS_CHANGED_BEACON_ENABLED |
 611                                                 BSS_CHANGED_HT |
 612                                                 BSS_CHANGED_BASIC_RATES |
 613                                                 BSS_CHANGED_BEACON_INT);
 614
 615         netif_carrier_on(sdata->dev);
 616 }
 617
 618 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 619 {
 620         struct ieee80211_local *local = sdata->local;
 621         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 622
 623         netif_carrier_off(sdata->dev);
 624
 625         /* stop the beacon */
 626         ifmsh->mesh_id_len = 0;
 627         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 628
 629         /* flush STAs and mpaths on this iface */
 630         sta_info_flush(sdata->local, sdata);
 631         mesh_path_flush_by_iface(sdata);
 632
 633         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 634         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 635         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 636         /*
 637          * If the timer fired while we waited for it, it will have
 638          * requeued the work. Now the work will be running again
 639          * but will not rearm the timer again because it checks
 640          * whether the interface is running, which, at this point,
 641          * it no longer is.
 642          */
 643         cancel_work_sync(&sdata->work);
 644
 645         local->fif_other_bss--;
 646         atomic_dec(&local->iff_allmultis);
 647         ieee80211_configure_filter(local);
 648
 649         sdata->u.mesh.timers_running = 0;
 650 }
 651
 652 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 653                                         u16 stype,
 654                                         struct ieee80211_mgmt *mgmt,
 655                                         size_t len,
 656                                         struct ieee80211_rx_status *rx_status)
 657 {
 658         struct ieee80211_local *local = sdata->local;
 659         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 660         struct ieee802_11_elems elems;
 661         struct ieee80211_channel *channel;
 662         size_t baselen;
 663         int freq;
 664         enum ieee80211_band band = rx_status->band;
 665
 666         /* ignore ProbeResp to foreign address */
 667         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 668             !ether_addr_equal(mgmt->da, sdata->vif.addr))
 669                 return;
 670
 671         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 672         if (baselen > len)
 673                 return;
 674
 675         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 676                                &elems);
 677
 678         /* ignore beacons from secure mesh peers if our security is off */
 679         if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
 680                 return;
 681
 682         if (elems.ds_params && elems.ds_params_len == 1)
 683                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 684         else
 685                 freq = rx_status->freq;
 686
 687         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 688
 689         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 690                 return;
 691
 692         if (elems.mesh_id && elems.mesh_config &&
 693             mesh_matches_local(sdata, &elems))
 694                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 695
 696         if (ifmsh->sync_ops)
 697                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 698                         stype, mgmt, &elems, rx_status);
 699 }
 700
 701 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 702                                           struct ieee80211_mgmt *mgmt,
 703                                           size_t len,
 704                                           struct ieee80211_rx_status *rx_status)
 705 {
 706         switch (mgmt->u.action.category) {
 707         case WLAN_CATEGORY_SELF_PROTECTED:
 708                 switch (mgmt->u.action.u.self_prot.action_code) {
 709                 case WLAN_SP_MESH_PEERING_OPEN:
 710                 case WLAN_SP_MESH_PEERING_CLOSE:
 711                 case WLAN_SP_MESH_PEERING_CONFIRM:
 712                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 713                         break;
 714                 }
 715                 break;
 716         case WLAN_CATEGORY_MESH_ACTION:
 717                 if (mesh_action_is_path_sel(mgmt))
 718                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 719                 break;
 720         }
 721 }
 722
 723 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 724                                    struct sk_buff *skb)
 725 {
 726         struct ieee80211_rx_status *rx_status;
 727         struct ieee80211_mgmt *mgmt;
 728         u16 stype;
 729
 730         rx_status = IEEE80211_SKB_RXCB(skb);
 731         mgmt = (struct ieee80211_mgmt *) skb->data;
 732         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 733
 734         switch (stype) {
 735         case IEEE80211_STYPE_PROBE_RESP:
 736         case IEEE80211_STYPE_BEACON:
 737                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 738                                             rx_status);
 739                 break;
 740         case IEEE80211_STYPE_ACTION:
 741                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 742                 break;
 743         }
 744 }
 745
 746 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 747 {
 748         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 749
 750         if (ifmsh->preq_queue_len &&
 751             time_after(jiffies,
 752                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 753                 mesh_path_start_discovery(sdata);
 754
 755         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 756                 mesh_mpath_table_grow();
 757
 758         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 759                 mesh_mpp_table_grow();
 760
 761         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 762                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 763
 764         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 765                 ieee80211_mesh_rootpath(sdata);
 766
 767         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
 768                 mesh_sync_adjust_tbtt(sdata);
 769 }
 770
 771 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 772 {
 773         struct ieee80211_sub_if_data *sdata;
 774
 775         rcu_read_lock();
 776         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 777                 if (ieee80211_vif_is_mesh(&sdata->vif))
 778                         ieee80211_queue_work(&local->hw, &sdata->work);
 779         rcu_read_unlock();
 780 }
 781
 782 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 783 {
 784         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 785
 786         setup_timer(&ifmsh->housekeeping_timer,
 787                     ieee80211_mesh_housekeeping_timer,
 788                     (unsigned long) sdata);
 789
 790         ifmsh->accepting_plinks = true;
 791         ifmsh->preq_id = 0;
 792         ifmsh->sn = 0;
 793         ifmsh->num_gates = 0;
 794         atomic_set(&ifmsh->mpaths, 0);
 795         mesh_rmc_init(sdata);
 796         ifmsh->last_preq = jiffies;
 797         ifmsh->next_perr = jiffies;
 798         /* Allocate all mesh structures when creating the first mesh interface. */
 799         if (!mesh_allocated)
 800                 ieee80211s_init();
 801         setup_timer(&ifmsh->mesh_path_timer,
 802                     ieee80211_mesh_path_timer,
 803                     (unsigned long) sdata);
 804         setup_timer(&ifmsh->mesh_path_root_timer,
 805                     ieee80211_mesh_path_root_timer,
 806                     (unsigned long) sdata);
 807         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 808         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 809         spin_lock_init(&ifmsh->sync_offset_lock);
 810 }