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 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         u8 *pos;
 353
 354         if (skb_tailroom(skb) < 3)
 355                 return -ENOMEM;
 356
 357         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 358         if (sband->band == IEEE80211_BAND_2GHZ) {
 359                 pos = skb_put(skb, 2 + 1);
 360                 *pos++ = WLAN_EID_DS_PARAMS;
 361                 *pos++ = 1;
 362                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 363         }
 364
 365         return 0;
 366 }
 367
 368 int mesh_add_ht_cap_ie(struct sk_buff *skb,
 369                        struct ieee80211_sub_if_data *sdata)
 370 {
 371         struct ieee80211_local *local = sdata->local;
 372         struct ieee80211_supported_band *sband;
 373         u8 *pos;
 374
 375         sband = local->hw.wiphy->bands[local->oper_channel->band];
 376         if (!sband->ht_cap.ht_supported ||
 377             local->_oper_channel_type == NL80211_CHAN_NO_HT)
 378                 return 0;
 379
 380         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 381                 return -ENOMEM;
 382
 383         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 384         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 385
 386         return 0;
 387 }
 388
 389 int mesh_add_ht_oper_ie(struct sk_buff *skb,
 390                         struct ieee80211_sub_if_data *sdata)
 391 {
 392         struct ieee80211_local *local = sdata->local;
 393         struct ieee80211_channel *channel = local->oper_channel;
 394         enum nl80211_channel_type channel_type = local->_oper_channel_type;
 395         struct ieee80211_supported_band *sband =
 396                                 local->hw.wiphy->bands[channel->band];
 397         struct ieee80211_sta_ht_cap *ht_cap = &sband->ht_cap;
 398         u8 *pos;
 399
 400         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 401                 return 0;
 402
 403         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 404                 return -ENOMEM;
 405
 406         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 407         ieee80211_ie_build_ht_oper(pos, ht_cap, channel, channel_type,
 408                                    sdata->vif.bss_conf.ht_operation_mode);
 409
 410         return 0;
 411 }
 412 static void ieee80211_mesh_path_timer(unsigned long data)
 413 {
 414         struct ieee80211_sub_if_data *sdata =
 415                 (struct ieee80211_sub_if_data *) data;
 416         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 417         struct ieee80211_local *local = sdata->local;
 418
 419         if (local->quiescing) {
 420                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 421                 return;
 422         }
 423
 424         ieee80211_queue_work(&local->hw, &sdata->work);
 425 }
 426
 427 static void ieee80211_mesh_path_root_timer(unsigned long data)
 428 {
 429         struct ieee80211_sub_if_data *sdata =
 430                 (struct ieee80211_sub_if_data *) data;
 431         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 432         struct ieee80211_local *local = sdata->local;
 433
 434         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 435
 436         if (local->quiescing) {
 437                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 438                 return;
 439         }
 440
 441         ieee80211_queue_work(&local->hw, &sdata->work);
 442 }
 443
 444 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 445 {
 446         if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
 447                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 448         else {
 449                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 450                 /* stop running timer */
 451                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 452         }
 453 }
 454
 455 /**
 456  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 457  * @hdr:        802.11 frame header
 458  * @fc:         frame control field
 459  * @meshda:     destination address in the mesh
 460  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 461  *              locally originated.
 462  *
 463  * Return the length of the 802.11 (does not include a mesh control header)
 464  */
 465 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 466                                   const u8 *meshda, const u8 *meshsa)
 467 {
 468         if (is_multicast_ether_addr(meshda)) {
 469                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 470                 /* DA TA SA */
 471                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 472                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 473                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 474                 return 24;
 475         } else {
 476                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 477                 /* RA TA DA SA */
 478                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 479                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 480                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 481                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 482                 return 30;
 483         }
 484 }
 485
 486 /**
 487  * ieee80211_new_mesh_header - create a new mesh header
 488  * @meshhdr:    uninitialized mesh header
 489  * @sdata:      mesh interface to be used
 490  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 491  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 492  *              be NULL.
 493  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 494  *              mesh frame
 495  *
 496  * Return the header length.
 497  */
 498 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 499                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 500                 char *addr6)
 501 {
 502         int aelen = 0;
 503         BUG_ON(!addr4or5 && addr6);
 504         memset(meshhdr, 0, sizeof(*meshhdr));
 505         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 506         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 507         sdata->u.mesh.mesh_seqnum++;
 508         if (addr4or5 && !addr6) {
 509                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 510                 aelen += ETH_ALEN;
 511                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 512         } else if (addr4or5 && addr6) {
 513                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 514                 aelen += 2 * ETH_ALEN;
 515                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 516                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 517         }
 518         return 6 + aelen;
 519 }
 520
 521 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 522                            struct ieee80211_if_mesh *ifmsh)
 523 {
 524         bool free_plinks;
 525
 526 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 527         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 528                sdata->name);
 529 #endif
 530
 531         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 532         mesh_path_expire(sdata);
 533
 534         free_plinks = mesh_plink_availables(sdata);
 535         if (free_plinks != sdata->u.mesh.accepting_plinks)
 536                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 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
 546         mesh_path_tx_root_frame(sdata);
 547         mod_timer(&ifmsh->mesh_path_root_timer,
 548                   round_jiffies(TU_TO_EXP_TIME(
 549                                   ifmsh->mshcfg.dot11MeshHWMPRannInterval)));
 550 }
 551
 552 #ifdef CONFIG_PM
 553 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 554 {
 555         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 556
 557         /* use atomic bitops in case all timers fire at the same time */
 558
 559         if (del_timer_sync(&ifmsh->housekeeping_timer))
 560                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 561         if (del_timer_sync(&ifmsh->mesh_path_timer))
 562                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 563         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 564                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 565 }
 566
 567 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 568 {
 569         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 570
 571         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 572                 add_timer(&ifmsh->housekeeping_timer);
 573         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 574                 add_timer(&ifmsh->mesh_path_timer);
 575         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 576                 add_timer(&ifmsh->mesh_path_root_timer);
 577         ieee80211_mesh_root_setup(ifmsh);
 578 }
 579 #endif
 580
 581 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 582 {
 583         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 584         struct ieee80211_local *local = sdata->local;
 585
 586         local->fif_other_bss++;
 587         /* mesh ifaces must set allmulti to forward mcast traffic */
 588         atomic_inc(&local->iff_allmultis);
 589         ieee80211_configure_filter(local);
 590
 591         ifmsh->mesh_cc_id = 0;  /* Disabled */
 592         ifmsh->mesh_auth_id = 0;        /* Disabled */
 593         /* register sync ops from extensible synchronization framework */
 594         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 595         ifmsh->adjusting_tbtt = false;
 596         ifmsh->sync_offset_clockdrift_max = 0;
 597         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 598         ieee80211_mesh_root_setup(ifmsh);
 599         ieee80211_queue_work(&local->hw, &sdata->work);
 600         sdata->vif.bss_conf.ht_operation_mode =
 601                                 ifmsh->mshcfg.ht_opmode;
 602         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 603         sdata->vif.bss_conf.basic_rates =
 604                 ieee80211_mandatory_rates(sdata->local,
 605                                           sdata->local->hw.conf.channel->band);
 606         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 607                                                 BSS_CHANGED_BEACON_ENABLED |
 608                                                 BSS_CHANGED_HT |
 609                                                 BSS_CHANGED_BASIC_RATES |
 610                                                 BSS_CHANGED_BEACON_INT);
 611 }
 612
 613 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 614 {
 615         struct ieee80211_local *local = sdata->local;
 616         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 617
 618         ifmsh->mesh_id_len = 0;
 619         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 620         sta_info_flush(local, NULL);
 621
 622         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 623         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 624         /*
 625          * If the timer fired while we waited for it, it will have
 626          * requeued the work. Now the work will be running again
 627          * but will not rearm the timer again because it checks
 628          * whether the interface is running, which, at this point,
 629          * it no longer is.
 630          */
 631         cancel_work_sync(&sdata->work);
 632
 633         local->fif_other_bss--;
 634         atomic_dec(&local->iff_allmultis);
 635         ieee80211_configure_filter(local);
 636 }
 637
 638 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 639                                         u16 stype,
 640                                         struct ieee80211_mgmt *mgmt,
 641                                         size_t len,
 642                                         struct ieee80211_rx_status *rx_status)
 643 {
 644         struct ieee80211_local *local = sdata->local;
 645         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 646         struct ieee802_11_elems elems;
 647         struct ieee80211_channel *channel;
 648         size_t baselen;
 649         int freq;
 650         enum ieee80211_band band = rx_status->band;
 651
 652         /* ignore ProbeResp to foreign address */
 653         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 654             !ether_addr_equal(mgmt->da, sdata->vif.addr))
 655                 return;
 656
 657         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 658         if (baselen > len)
 659                 return;
 660
 661         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 662                                &elems);
 663
 664         /* ignore beacons from secure mesh peers if our security is off */
 665         if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
 666                 return;
 667
 668         if (elems.ds_params && elems.ds_params_len == 1)
 669                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 670         else
 671                 freq = rx_status->freq;
 672
 673         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 674
 675         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 676                 return;
 677
 678         if (elems.mesh_id && elems.mesh_config &&
 679             mesh_matches_local(sdata, &elems))
 680                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 681
 682         if (ifmsh->sync_ops)
 683                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 684                         stype, mgmt, &elems, rx_status);
 685 }
 686
 687 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 688                                           struct ieee80211_mgmt *mgmt,
 689                                           size_t len,
 690                                           struct ieee80211_rx_status *rx_status)
 691 {
 692         switch (mgmt->u.action.category) {
 693         case WLAN_CATEGORY_SELF_PROTECTED:
 694                 switch (mgmt->u.action.u.self_prot.action_code) {
 695                 case WLAN_SP_MESH_PEERING_OPEN:
 696                 case WLAN_SP_MESH_PEERING_CLOSE:
 697                 case WLAN_SP_MESH_PEERING_CONFIRM:
 698                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 699                         break;
 700                 }
 701                 break;
 702         case WLAN_CATEGORY_MESH_ACTION:
 703                 if (mesh_action_is_path_sel(mgmt))
 704                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 705                 break;
 706         }
 707 }
 708
 709 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 710                                    struct sk_buff *skb)
 711 {
 712         struct ieee80211_rx_status *rx_status;
 713         struct ieee80211_mgmt *mgmt;
 714         u16 stype;
 715
 716         rx_status = IEEE80211_SKB_RXCB(skb);
 717         mgmt = (struct ieee80211_mgmt *) skb->data;
 718         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 719
 720         switch (stype) {
 721         case IEEE80211_STYPE_PROBE_RESP:
 722         case IEEE80211_STYPE_BEACON:
 723                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 724                                             rx_status);
 725                 break;
 726         case IEEE80211_STYPE_ACTION:
 727                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 728                 break;
 729         }
 730 }
 731
 732 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 733 {
 734         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 735
 736         if (ifmsh->preq_queue_len &&
 737             time_after(jiffies,
 738                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 739                 mesh_path_start_discovery(sdata);
 740
 741         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 742                 mesh_mpath_table_grow();
 743
 744         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 745                 mesh_mpp_table_grow();
 746
 747         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 748                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 749
 750         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 751                 ieee80211_mesh_rootpath(sdata);
 752
 753         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
 754                 mesh_sync_adjust_tbtt(sdata);
 755 }
 756
 757 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 758 {
 759         struct ieee80211_sub_if_data *sdata;
 760
 761         rcu_read_lock();
 762         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 763                 if (ieee80211_vif_is_mesh(&sdata->vif))
 764                         ieee80211_queue_work(&local->hw, &sdata->work);
 765         rcu_read_unlock();
 766 }
 767
 768 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 769 {
 770         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 771
 772         setup_timer(&ifmsh->housekeeping_timer,
 773                     ieee80211_mesh_housekeeping_timer,
 774                     (unsigned long) sdata);
 775
 776         ifmsh->accepting_plinks = true;
 777         ifmsh->preq_id = 0;
 778         ifmsh->sn = 0;
 779         ifmsh->num_gates = 0;
 780         atomic_set(&ifmsh->mpaths, 0);
 781         mesh_rmc_init(sdata);
 782         ifmsh->last_preq = jiffies;
 783         ifmsh->next_perr = jiffies;
 784         /* Allocate all mesh structures when creating the first mesh interface. */
 785         if (!mesh_allocated)
 786                 ieee80211s_init();
 787         setup_timer(&ifmsh->mesh_path_timer,
 788                     ieee80211_mesh_path_timer,
 789                     (unsigned long) sdata);
 790         setup_timer(&ifmsh->mesh_path_root_timer,
 791                     ieee80211_mesh_path_root_timer,
 792                     (unsigned long) sdata);
 793         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 794         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 795         spin_lock_init(&ifmsh->sync_offset_lock);
 796 }