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  * 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         struct ieee80211_channel *chan = local->oper_channel;
 359         u8 *pos;
 360
 361         if (skb_tailroom(skb) < 3)
 362                 return -ENOMEM;
 363
 364         sband = local->hw.wiphy->bands[chan->band];
 365         if (sband->band == IEEE80211_BAND_2GHZ) {
 366                 pos = skb_put(skb, 2 + 1);
 367                 *pos++ = WLAN_EID_DS_PARAMS;
 368                 *pos++ = 1;
 369                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 370         }
 371
 372         return 0;
 373 }
 374
 375 int mesh_add_ht_cap_ie(struct sk_buff *skb,
 376                        struct ieee80211_sub_if_data *sdata)
 377 {
 378         struct ieee80211_local *local = sdata->local;
 379         struct ieee80211_supported_band *sband;
 380         u8 *pos;
 381
 382         sband = local->hw.wiphy->bands[local->oper_channel->band];
 383         if (!sband->ht_cap.ht_supported ||
 384             sdata->vif.bss_conf.channel_type == NL80211_CHAN_NO_HT)
 385                 return 0;
 386
 387         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 388                 return -ENOMEM;
 389
 390         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 391         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 392
 393         return 0;
 394 }
 395
 396 int mesh_add_ht_oper_ie(struct sk_buff *skb,
 397                         struct ieee80211_sub_if_data *sdata)
 398 {
 399         struct ieee80211_local *local = sdata->local;
 400         struct ieee80211_channel *channel = local->oper_channel;
 401         enum nl80211_channel_type channel_type =
 402                                 sdata->vif.bss_conf.channel_type;
 403         struct ieee80211_supported_band *sband =
 404                                 local->hw.wiphy->bands[channel->band];
 405         struct ieee80211_sta_ht_cap *ht_cap = &sband->ht_cap;
 406         u8 *pos;
 407
 408         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 409                 return 0;
 410
 411         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 412                 return -ENOMEM;
 413
 414         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 415         ieee80211_ie_build_ht_oper(pos, ht_cap, channel, channel_type,
 416                                    sdata->vif.bss_conf.ht_operation_mode);
 417
 418         return 0;
 419 }
 420 static void ieee80211_mesh_path_timer(unsigned long data)
 421 {
 422         struct ieee80211_sub_if_data *sdata =
 423                 (struct ieee80211_sub_if_data *) data;
 424         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 425         struct ieee80211_local *local = sdata->local;
 426
 427         if (local->quiescing) {
 428                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 429                 return;
 430         }
 431
 432         ieee80211_queue_work(&local->hw, &sdata->work);
 433 }
 434
 435 static void ieee80211_mesh_path_root_timer(unsigned long data)
 436 {
 437         struct ieee80211_sub_if_data *sdata =
 438                 (struct ieee80211_sub_if_data *) data;
 439         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 440         struct ieee80211_local *local = sdata->local;
 441
 442         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 443
 444         if (local->quiescing) {
 445                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 446                 return;
 447         }
 448
 449         ieee80211_queue_work(&local->hw, &sdata->work);
 450 }
 451
 452 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 453 {
 454         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 455                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 456         else {
 457                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 458                 /* stop running timer */
 459                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 460         }
 461 }
 462
 463 /**
 464  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 465  * @hdr:        802.11 frame header
 466  * @fc:         frame control field
 467  * @meshda:     destination address in the mesh
 468  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 469  *              locally originated.
 470  *
 471  * Return the length of the 802.11 (does not include a mesh control header)
 472  */
 473 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 474                                   const u8 *meshda, const u8 *meshsa)
 475 {
 476         if (is_multicast_ether_addr(meshda)) {
 477                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 478                 /* DA TA SA */
 479                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 480                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 481                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 482                 return 24;
 483         } else {
 484                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 485                 /* RA TA DA SA */
 486                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 487                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 488                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 489                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 490                 return 30;
 491         }
 492 }
 493
 494 /**
 495  * ieee80211_new_mesh_header - create a new mesh header
 496  * @meshhdr:    uninitialized mesh header
 497  * @sdata:      mesh interface to be used
 498  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 499  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 500  *              be NULL.
 501  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 502  *              mesh frame
 503  *
 504  * Return the header length.
 505  */
 506 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 507                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 508                 char *addr6)
 509 {
 510         int aelen = 0;
 511         BUG_ON(!addr4or5 && addr6);
 512         memset(meshhdr, 0, sizeof(*meshhdr));
 513         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 514         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 515         sdata->u.mesh.mesh_seqnum++;
 516         if (addr4or5 && !addr6) {
 517                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 518                 aelen += ETH_ALEN;
 519                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 520         } else if (addr4or5 && addr6) {
 521                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 522                 aelen += 2 * ETH_ALEN;
 523                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 524                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 525         }
 526         return 6 + aelen;
 527 }
 528
 529 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 530                            struct ieee80211_if_mesh *ifmsh)
 531 {
 532         u32 changed;
 533
 534         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 535         mesh_path_expire(sdata);
 536
 537         changed = mesh_accept_plinks_update(sdata);
 538         ieee80211_bss_info_change_notify(sdata, changed);
 539
 540         mod_timer(&ifmsh->housekeeping_timer,
 541                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 542 }
 543
 544 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 545 {
 546         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 547         u32 interval;
 548
 549         mesh_path_tx_root_frame(sdata);
 550
 551         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 552                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 553         else
 554                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 555
 556         mod_timer(&ifmsh->mesh_path_root_timer,
 557                   round_jiffies(TU_TO_EXP_TIME(interval)));
 558 }
 559
 560 #ifdef CONFIG_PM
 561 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 562 {
 563         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 564
 565         /* use atomic bitops in case all timers fire at the same time */
 566
 567         if (del_timer_sync(&ifmsh->housekeeping_timer))
 568                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 569         if (del_timer_sync(&ifmsh->mesh_path_timer))
 570                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 571         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 572                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 573 }
 574
 575 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 576 {
 577         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 578
 579         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 580                 add_timer(&ifmsh->housekeeping_timer);
 581         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 582                 add_timer(&ifmsh->mesh_path_timer);
 583         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 584                 add_timer(&ifmsh->mesh_path_root_timer);
 585         ieee80211_mesh_root_setup(ifmsh);
 586 }
 587 #endif
 588
 589 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 590 {
 591         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 592         struct ieee80211_local *local = sdata->local;
 593
 594         local->fif_other_bss++;
 595         /* mesh ifaces must set allmulti to forward mcast traffic */
 596         atomic_inc(&local->iff_allmultis);
 597         ieee80211_configure_filter(local);
 598
 599         ifmsh->mesh_cc_id = 0;  /* Disabled */
 600         ifmsh->mesh_auth_id = 0;        /* Disabled */
 601         /* register sync ops from extensible synchronization framework */
 602         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 603         ifmsh->adjusting_tbtt = false;
 604         ifmsh->sync_offset_clockdrift_max = 0;
 605         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 606         ieee80211_mesh_root_setup(ifmsh);
 607         ieee80211_queue_work(&local->hw, &sdata->work);
 608         sdata->vif.bss_conf.ht_operation_mode =
 609                                 ifmsh->mshcfg.ht_opmode;
 610         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 611         sdata->vif.bss_conf.basic_rates =
 612                 ieee80211_mandatory_rates(sdata->local,
 613                                           sdata->local->oper_channel->band);
 614         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 615                                                 BSS_CHANGED_BEACON_ENABLED |
 616                                                 BSS_CHANGED_HT |
 617                                                 BSS_CHANGED_BASIC_RATES |
 618                                                 BSS_CHANGED_BEACON_INT);
 619
 620         netif_carrier_on(sdata->dev);
 621 }
 622
 623 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 624 {
 625         struct ieee80211_local *local = sdata->local;
 626         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 627
 628         netif_carrier_off(sdata->dev);
 629
 630         /* stop the beacon */
 631         ifmsh->mesh_id_len = 0;
 632         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 633
 634         /* flush STAs and mpaths on this iface */
 635         sta_info_flush(sdata->local, sdata);
 636         mesh_path_flush_by_iface(sdata);
 637
 638         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 639         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 640         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 641         /*
 642          * If the timer fired while we waited for it, it will have
 643          * requeued the work. Now the work will be running again
 644          * but will not rearm the timer again because it checks
 645          * whether the interface is running, which, at this point,
 646          * it no longer is.
 647          */
 648         cancel_work_sync(&sdata->work);
 649
 650         local->fif_other_bss--;
 651         atomic_dec(&local->iff_allmultis);
 652         ieee80211_configure_filter(local);
 653
 654         sdata->u.mesh.timers_running = 0;
 655 }
 656
 657 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 658                                         u16 stype,
 659                                         struct ieee80211_mgmt *mgmt,
 660                                         size_t len,
 661                                         struct ieee80211_rx_status *rx_status)
 662 {
 663         struct ieee80211_local *local = sdata->local;
 664         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 665         struct ieee802_11_elems elems;
 666         struct ieee80211_channel *channel;
 667         size_t baselen;
 668         int freq;
 669         enum ieee80211_band band = rx_status->band;
 670
 671         /* ignore ProbeResp to foreign address */
 672         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 673             !ether_addr_equal(mgmt->da, sdata->vif.addr))
 674                 return;
 675
 676         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 677         if (baselen > len)
 678                 return;
 679
 680         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 681                                &elems);
 682
 683         /* ignore beacons from secure mesh peers if our security is off */
 684         if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
 685                 return;
 686
 687         if (elems.ds_params && elems.ds_params_len == 1)
 688                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 689         else
 690                 freq = rx_status->freq;
 691
 692         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 693
 694         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 695                 return;
 696
 697         if (elems.mesh_id && elems.mesh_config &&
 698             mesh_matches_local(sdata, &elems))
 699                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 700
 701         if (ifmsh->sync_ops)
 702                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 703                         stype, mgmt, &elems, rx_status);
 704 }
 705
 706 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 707                                           struct ieee80211_mgmt *mgmt,
 708                                           size_t len,
 709                                           struct ieee80211_rx_status *rx_status)
 710 {
 711         switch (mgmt->u.action.category) {
 712         case WLAN_CATEGORY_SELF_PROTECTED:
 713                 switch (mgmt->u.action.u.self_prot.action_code) {
 714                 case WLAN_SP_MESH_PEERING_OPEN:
 715                 case WLAN_SP_MESH_PEERING_CLOSE:
 716                 case WLAN_SP_MESH_PEERING_CONFIRM:
 717                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 718                         break;
 719                 }
 720                 break;
 721         case WLAN_CATEGORY_MESH_ACTION:
 722                 if (mesh_action_is_path_sel(mgmt))
 723                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 724                 break;
 725         }
 726 }
 727
 728 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 729                                    struct sk_buff *skb)
 730 {
 731         struct ieee80211_rx_status *rx_status;
 732         struct ieee80211_mgmt *mgmt;
 733         u16 stype;
 734
 735         rx_status = IEEE80211_SKB_RXCB(skb);
 736         mgmt = (struct ieee80211_mgmt *) skb->data;
 737         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 738
 739         switch (stype) {
 740         case IEEE80211_STYPE_PROBE_RESP:
 741         case IEEE80211_STYPE_BEACON:
 742                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 743                                             rx_status);
 744                 break;
 745         case IEEE80211_STYPE_ACTION:
 746                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 747                 break;
 748         }
 749 }
 750
 751 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 752 {
 753         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 754
 755         if (ifmsh->preq_queue_len &&
 756             time_after(jiffies,
 757                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 758                 mesh_path_start_discovery(sdata);
 759
 760         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 761                 mesh_mpath_table_grow();
 762
 763         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 764                 mesh_mpp_table_grow();
 765
 766         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 767                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 768
 769         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 770                 ieee80211_mesh_rootpath(sdata);
 771
 772         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
 773                 mesh_sync_adjust_tbtt(sdata);
 774 }
 775
 776 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 777 {
 778         struct ieee80211_sub_if_data *sdata;
 779
 780         rcu_read_lock();
 781         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 782                 if (ieee80211_vif_is_mesh(&sdata->vif))
 783                         ieee80211_queue_work(&local->hw, &sdata->work);
 784         rcu_read_unlock();
 785 }
 786
 787 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 788 {
 789         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 790
 791         setup_timer(&ifmsh->housekeeping_timer,
 792                     ieee80211_mesh_housekeeping_timer,
 793                     (unsigned long) sdata);
 794
 795         ifmsh->accepting_plinks = true;
 796         ifmsh->preq_id = 0;
 797         ifmsh->sn = 0;
 798         ifmsh->num_gates = 0;
 799         atomic_set(&ifmsh->mpaths, 0);
 800         mesh_rmc_init(sdata);
 801         ifmsh->last_preq = jiffies;
 802         ifmsh->next_perr = jiffies;
 803         /* Allocate all mesh structures when creating the first mesh interface. */
 804         if (!mesh_allocated)
 805                 ieee80211s_init();
 806         setup_timer(&ifmsh->mesh_path_timer,
 807                     ieee80211_mesh_path_timer,
 808                     (unsigned long) sdata);
 809         setup_timer(&ifmsh->mesh_path_root_timer,
 810                     ieee80211_mesh_path_root_timer,
 811                     (unsigned long) sdata);
 812         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 813         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 814         spin_lock_init(&ifmsh->sync_offset_lock);
 815 }