linux/net/mac80211/mesh.c
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   1/*
   2 * Copyright (c) 2008 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 <asm/unaligned.h>
  12#include "ieee80211_i.h"
  13#include "mesh.h"
  14
  15#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
  16#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
  17
  18#define PP_OFFSET       1               /* Path Selection Protocol */
  19#define PM_OFFSET       5               /* Path Selection Metric   */
  20#define CC_OFFSET       9               /* Congestion Control Mode */
  21#define CAPAB_OFFSET 17
  22#define ACCEPT_PLINKS 0x80
  23
  24int mesh_allocated;
  25static struct kmem_cache *rm_cache;
  26
  27void ieee80211s_init(void)
  28{
  29        mesh_pathtbl_init();
  30        mesh_allocated = 1;
  31        rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  32                                     0, 0, NULL);
  33}
  34
  35void ieee80211s_stop(void)
  36{
  37        mesh_pathtbl_unregister();
  38        kmem_cache_destroy(rm_cache);
  39}
  40
  41static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  42{
  43        struct ieee80211_sub_if_data *sdata = (void *) data;
  44        struct ieee80211_local *local = sdata->local;
  45        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  46
  47        ifmsh->housekeeping = true;
  48        queue_work(local->hw.workqueue, &ifmsh->work);
  49}
  50
  51/**
  52 * mesh_matches_local - check if the config of a mesh point matches ours
  53 *
  54 * @ie: information elements of a management frame from the mesh peer
  55 * @sdata: local mesh subif
  56 *
  57 * This function checks if the mesh configuration of a mesh point matches the
  58 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  59 */
  60bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
  61{
  62        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  63
  64        /*
  65         * As support for each feature is added, check for matching
  66         * - On mesh config capabilities
  67         *   - Power Save Support En
  68         *   - Sync support enabled
  69         *   - Sync support active
  70         *   - Sync support required from peer
  71         *   - MDA enabled
  72         * - Power management control on fc
  73         */
  74        if (ifmsh->mesh_id_len == ie->mesh_id_len &&
  75                memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  76                memcmp(ifmsh->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 &&
  77                memcmp(ifmsh->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 &&
  78                memcmp(ifmsh->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0)
  79                return true;
  80
  81        return false;
  82}
  83
  84/**
  85 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
  86 *
  87 * @ie: information elements of a management frame from the mesh peer
  88 */
  89bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
  90{
  91        return (*(ie->mesh_config + CAPAB_OFFSET) & ACCEPT_PLINKS) != 0;
  92}
  93
  94/**
  95 * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
  96 *
  97 * @sdata: mesh interface in which mesh beacons are going to be updated
  98 */
  99void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 100{
 101        bool free_plinks;
 102
 103        /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 104         * the mesh interface might be able to establish plinks with peers that
 105         * are already on the table but are not on PLINK_ESTAB state. However,
 106         * in general the mesh interface is not accepting peer link requests
 107         * from new peers, and that must be reflected in the beacon
 108         */
 109        free_plinks = mesh_plink_availables(sdata);
 110
 111        if (free_plinks != sdata->u.mesh.accepting_plinks)
 112                ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 113}
 114
 115void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
 116{
 117        u8 def_id[4] = {0x00, 0x0F, 0xAC, 0xff};
 118
 119        memcpy(sta->mesh_pp_id, def_id, 4);
 120        memcpy(sta->mesh_pm_id, def_id, 4);
 121        memcpy(sta->mesh_cc_id, def_id, 4);
 122}
 123
 124int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 125{
 126        int i;
 127
 128        sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 129        if (!sdata->u.mesh.rmc)
 130                return -ENOMEM;
 131        sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 132        for (i = 0; i < RMC_BUCKETS; i++)
 133                INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 134        return 0;
 135}
 136
 137void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 138{
 139        struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 140        struct rmc_entry *p, *n;
 141        int i;
 142
 143        if (!sdata->u.mesh.rmc)
 144                return;
 145
 146        for (i = 0; i < RMC_BUCKETS; i++)
 147                list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 148                        list_del(&p->list);
 149                        kmem_cache_free(rm_cache, p);
 150                }
 151
 152        kfree(rmc);
 153        sdata->u.mesh.rmc = NULL;
 154}
 155
 156/**
 157 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 158 *
 159 * @sa:         source address
 160 * @mesh_hdr:   mesh_header
 161 *
 162 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 163 *
 164 * Checks using the source address and the mesh sequence number if we have
 165 * received this frame lately. If the frame is not in the cache, it is added to
 166 * it.
 167 */
 168int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 169                   struct ieee80211_sub_if_data *sdata)
 170{
 171        struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 172        u32 seqnum = 0;
 173        int entries = 0;
 174        u8 idx;
 175        struct rmc_entry *p, *n;
 176
 177        /* Don't care about endianness since only match matters */
 178        memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 179        idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 180        list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 181                ++entries;
 182                if (time_after(jiffies, p->exp_time) ||
 183                                (entries == RMC_QUEUE_MAX_LEN)) {
 184                        list_del(&p->list);
 185                        kmem_cache_free(rm_cache, p);
 186                        --entries;
 187                } else if ((seqnum == p->seqnum)
 188                                && (memcmp(sa, p->sa, ETH_ALEN) == 0))
 189                        return -1;
 190        }
 191
 192        p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 193        if (!p) {
 194                printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
 195                return 0;
 196        }
 197        p->seqnum = seqnum;
 198        p->exp_time = jiffies + RMC_TIMEOUT;
 199        memcpy(p->sa, sa, ETH_ALEN);
 200        list_add(&p->list, &rmc->bucket[idx].list);
 201        return 0;
 202}
 203
 204void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 205{
 206        struct ieee80211_local *local = sdata->local;
 207        struct ieee80211_supported_band *sband;
 208        u8 *pos;
 209        int len, i, rate;
 210
 211        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 212        len = sband->n_bitrates;
 213        if (len > 8)
 214                len = 8;
 215        pos = skb_put(skb, len + 2);
 216        *pos++ = WLAN_EID_SUPP_RATES;
 217        *pos++ = len;
 218        for (i = 0; i < len; i++) {
 219                rate = sband->bitrates[i].bitrate;
 220                *pos++ = (u8) (rate / 5);
 221        }
 222
 223        if (sband->n_bitrates > len) {
 224                pos = skb_put(skb, sband->n_bitrates - len + 2);
 225                *pos++ = WLAN_EID_EXT_SUPP_RATES;
 226                *pos++ = sband->n_bitrates - len;
 227                for (i = len; i < sband->n_bitrates; i++) {
 228                        rate = sband->bitrates[i].bitrate;
 229                        *pos++ = (u8) (rate / 5);
 230                }
 231        }
 232
 233        pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
 234        *pos++ = WLAN_EID_MESH_ID;
 235        *pos++ = sdata->u.mesh.mesh_id_len;
 236        if (sdata->u.mesh.mesh_id_len)
 237                memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
 238
 239        pos = skb_put(skb, 21);
 240        *pos++ = WLAN_EID_MESH_CONFIG;
 241        *pos++ = IEEE80211_MESH_CONFIG_LEN;
 242        /* Version */
 243        *pos++ = 1;
 244
 245        /* Active path selection protocol ID */
 246        memcpy(pos, sdata->u.mesh.mesh_pp_id, 4);
 247        pos += 4;
 248
 249        /* Active path selection metric ID   */
 250        memcpy(pos, sdata->u.mesh.mesh_pm_id, 4);
 251        pos += 4;
 252
 253        /* Congestion control mode identifier */
 254        memcpy(pos, sdata->u.mesh.mesh_cc_id, 4);
 255        pos += 4;
 256
 257        /* Channel precedence:
 258         * Not running simple channel unification protocol
 259         */
 260        memset(pos, 0x00, 4);
 261        pos += 4;
 262
 263        /* Mesh capability */
 264        sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
 265        *pos++ = sdata->u.mesh.accepting_plinks ? ACCEPT_PLINKS : 0x00;
 266        *pos++ = 0x00;
 267
 268        return;
 269}
 270
 271u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
 272{
 273        /* Use last four bytes of hw addr and interface index as hash index */
 274        return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
 275                & tbl->hash_mask;
 276}
 277
 278struct mesh_table *mesh_table_alloc(int size_order)
 279{
 280        int i;
 281        struct mesh_table *newtbl;
 282
 283        newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
 284        if (!newtbl)
 285                return NULL;
 286
 287        newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
 288                        (1 << size_order), GFP_KERNEL);
 289
 290        if (!newtbl->hash_buckets) {
 291                kfree(newtbl);
 292                return NULL;
 293        }
 294
 295        newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
 296                        (1 << size_order), GFP_KERNEL);
 297        if (!newtbl->hashwlock) {
 298                kfree(newtbl->hash_buckets);
 299                kfree(newtbl);
 300                return NULL;
 301        }
 302
 303        newtbl->size_order = size_order;
 304        newtbl->hash_mask = (1 << size_order) - 1;
 305        atomic_set(&newtbl->entries,  0);
 306        get_random_bytes(&newtbl->hash_rnd,
 307                        sizeof(newtbl->hash_rnd));
 308        for (i = 0; i <= newtbl->hash_mask; i++)
 309                spin_lock_init(&newtbl->hashwlock[i]);
 310
 311        return newtbl;
 312}
 313
 314static void __mesh_table_free(struct mesh_table *tbl)
 315{
 316        kfree(tbl->hash_buckets);
 317        kfree(tbl->hashwlock);
 318        kfree(tbl);
 319}
 320
 321void mesh_table_free(struct mesh_table *tbl, bool free_leafs)
 322{
 323        struct hlist_head *mesh_hash;
 324        struct hlist_node *p, *q;
 325        int i;
 326
 327        mesh_hash = tbl->hash_buckets;
 328        for (i = 0; i <= tbl->hash_mask; i++) {
 329                spin_lock(&tbl->hashwlock[i]);
 330                hlist_for_each_safe(p, q, &mesh_hash[i]) {
 331                        tbl->free_node(p, free_leafs);
 332                        atomic_dec(&tbl->entries);
 333                }
 334                spin_unlock(&tbl->hashwlock[i]);
 335        }
 336        __mesh_table_free(tbl);
 337}
 338
 339static void ieee80211_mesh_path_timer(unsigned long data)
 340{
 341        struct ieee80211_sub_if_data *sdata =
 342                (struct ieee80211_sub_if_data *) data;
 343        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 344        struct ieee80211_local *local = sdata->local;
 345
 346        queue_work(local->hw.workqueue, &ifmsh->work);
 347}
 348
 349struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
 350{
 351        struct mesh_table *newtbl;
 352        struct hlist_head *oldhash;
 353        struct hlist_node *p, *q;
 354        int i;
 355
 356        if (atomic_read(&tbl->entries)
 357                        < tbl->mean_chain_len * (tbl->hash_mask + 1))
 358                goto endgrow;
 359
 360        newtbl = mesh_table_alloc(tbl->size_order + 1);
 361        if (!newtbl)
 362                goto endgrow;
 363
 364        newtbl->free_node = tbl->free_node;
 365        newtbl->mean_chain_len = tbl->mean_chain_len;
 366        newtbl->copy_node = tbl->copy_node;
 367        atomic_set(&newtbl->entries, atomic_read(&tbl->entries));
 368
 369        oldhash = tbl->hash_buckets;
 370        for (i = 0; i <= tbl->hash_mask; i++)
 371                hlist_for_each(p, &oldhash[i])
 372                        if (tbl->copy_node(p, newtbl) < 0)
 373                                goto errcopy;
 374
 375        return newtbl;
 376
 377errcopy:
 378        for (i = 0; i <= newtbl->hash_mask; i++) {
 379                hlist_for_each_safe(p, q, &newtbl->hash_buckets[i])
 380                        tbl->free_node(p, 0);
 381        }
 382        __mesh_table_free(newtbl);
 383endgrow:
 384        return NULL;
 385}
 386
 387/**
 388 * ieee80211_new_mesh_header - create a new mesh header
 389 * @meshhdr:    uninitialized mesh header
 390 * @sdata:      mesh interface to be used
 391 *
 392 * Return the header length.
 393 */
 394int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 395                struct ieee80211_sub_if_data *sdata)
 396{
 397        meshhdr->flags = 0;
 398        meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 399        put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 400        sdata->u.mesh.mesh_seqnum++;
 401
 402        return 6;
 403}
 404
 405static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 406                           struct ieee80211_if_mesh *ifmsh)
 407{
 408        bool free_plinks;
 409
 410#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 411        printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 412               sdata->dev->name);
 413#endif
 414
 415        ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 416        mesh_path_expire(sdata);
 417
 418        free_plinks = mesh_plink_availables(sdata);
 419        if (free_plinks != sdata->u.mesh.accepting_plinks)
 420                ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
 421
 422        ifmsh->housekeeping = false;
 423        mod_timer(&ifmsh->housekeeping_timer,
 424                  round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 425}
 426
 427
 428void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 429{
 430        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 431        struct ieee80211_local *local = sdata->local;
 432
 433        ifmsh->housekeeping = true;
 434        queue_work(local->hw.workqueue, &ifmsh->work);
 435        ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
 436                                   IEEE80211_IFCC_BEACON_ENABLED);
 437}
 438
 439void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 440{
 441        del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 442        /*
 443         * If the timer fired while we waited for it, it will have
 444         * requeued the work. Now the work will be running again
 445         * but will not rearm the timer again because it checks
 446         * whether the interface is running, which, at this point,
 447         * it no longer is.
 448         */
 449        cancel_work_sync(&sdata->u.mesh.work);
 450
 451        /*
 452         * When we get here, the interface is marked down.
 453         * Call synchronize_rcu() to wait for the RX path
 454         * should it be using the interface and enqueuing
 455         * frames at this very time on another CPU.
 456         */
 457        synchronize_rcu();
 458        skb_queue_purge(&sdata->u.mesh.skb_queue);
 459}
 460
 461static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 462                                        u16 stype,
 463                                        struct ieee80211_mgmt *mgmt,
 464                                        size_t len,
 465                                        struct ieee80211_rx_status *rx_status)
 466{
 467        struct ieee80211_local *local = sdata->local;
 468        struct ieee802_11_elems elems;
 469        struct ieee80211_channel *channel;
 470        u32 supp_rates = 0;
 471        size_t baselen;
 472        int freq;
 473        enum ieee80211_band band = rx_status->band;
 474
 475        /* ignore ProbeResp to foreign address */
 476        if (stype == IEEE80211_STYPE_PROBE_RESP &&
 477            compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
 478                return;
 479
 480        baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 481        if (baselen > len)
 482                return;
 483
 484        ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 485                               &elems);
 486
 487        if (elems.ds_params && elems.ds_params_len == 1)
 488                freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 489        else
 490                freq = rx_status->freq;
 491
 492        channel = ieee80211_get_channel(local->hw.wiphy, freq);
 493
 494        if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 495                return;
 496
 497        if (elems.mesh_id && elems.mesh_config &&
 498            mesh_matches_local(&elems, sdata)) {
 499                supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 500
 501                mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
 502                                      mesh_peer_accepts_plinks(&elems));
 503        }
 504}
 505
 506static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 507                                          struct ieee80211_mgmt *mgmt,
 508                                          size_t len,
 509                                          struct ieee80211_rx_status *rx_status)
 510{
 511        switch (mgmt->u.action.category) {
 512        case PLINK_CATEGORY:
 513                mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 514                break;
 515        case MESH_PATH_SEL_CATEGORY:
 516                mesh_rx_path_sel_frame(sdata, mgmt, len);
 517                break;
 518        }
 519}
 520
 521static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 522                                          struct sk_buff *skb)
 523{
 524        struct ieee80211_rx_status *rx_status;
 525        struct ieee80211_if_mesh *ifmsh;
 526        struct ieee80211_mgmt *mgmt;
 527        u16 stype;
 528
 529        ifmsh = &sdata->u.mesh;
 530
 531        rx_status = (struct ieee80211_rx_status *) skb->cb;
 532        mgmt = (struct ieee80211_mgmt *) skb->data;
 533        stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 534
 535        switch (stype) {
 536        case IEEE80211_STYPE_PROBE_RESP:
 537        case IEEE80211_STYPE_BEACON:
 538                ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 539                                            rx_status);
 540                break;
 541        case IEEE80211_STYPE_ACTION:
 542                ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 543                break;
 544        }
 545
 546        kfree_skb(skb);
 547}
 548
 549static void ieee80211_mesh_work(struct work_struct *work)
 550{
 551        struct ieee80211_sub_if_data *sdata =
 552                container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
 553        struct ieee80211_local *local = sdata->local;
 554        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 555        struct sk_buff *skb;
 556
 557        if (!netif_running(sdata->dev))
 558                return;
 559
 560        if (local->sw_scanning || local->hw_scanning)
 561                return;
 562
 563        while ((skb = skb_dequeue(&ifmsh->skb_queue)))
 564                ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 565
 566        if (ifmsh->preq_queue_len &&
 567            time_after(jiffies,
 568                       ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 569                mesh_path_start_discovery(sdata);
 570
 571        if (ifmsh->housekeeping)
 572                ieee80211_mesh_housekeeping(sdata, ifmsh);
 573}
 574
 575void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 576{
 577        struct ieee80211_sub_if_data *sdata;
 578
 579        rcu_read_lock();
 580        list_for_each_entry_rcu(sdata, &local->interfaces, list)
 581                if (ieee80211_vif_is_mesh(&sdata->vif))
 582                        queue_work(local->hw.workqueue, &sdata->u.mesh.work);
 583        rcu_read_unlock();
 584}
 585
 586void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 587{
 588        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 589
 590        INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
 591        setup_timer(&ifmsh->housekeeping_timer,
 592                    ieee80211_mesh_housekeeping_timer,
 593                    (unsigned long) sdata);
 594        skb_queue_head_init(&sdata->u.mesh.skb_queue);
 595
 596        ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
 597        ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
 598        ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
 599        ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
 600        ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
 601        ifmsh->mshcfg.auto_open_plinks = true;
 602        ifmsh->mshcfg.dot11MeshMaxPeerLinks =
 603                MESH_MAX_ESTAB_PLINKS;
 604        ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
 605                MESH_PATH_TIMEOUT;
 606        ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
 607                MESH_PREQ_MIN_INT;
 608        ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
 609                MESH_DIAM_TRAVERSAL_TIME;
 610        ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
 611                MESH_MAX_PREQ_RETRIES;
 612        ifmsh->mshcfg.path_refresh_time =
 613                MESH_PATH_REFRESH_TIME;
 614        ifmsh->mshcfg.min_discovery_timeout =
 615                MESH_MIN_DISCOVERY_TIMEOUT;
 616        ifmsh->accepting_plinks = true;
 617        ifmsh->preq_id = 0;
 618        ifmsh->dsn = 0;
 619        atomic_set(&ifmsh->mpaths, 0);
 620        mesh_rmc_init(sdata);
 621        ifmsh->last_preq = jiffies;
 622        /* Allocate all mesh structures when creating the first mesh interface. */
 623        if (!mesh_allocated)
 624                ieee80211s_init();
 625        mesh_ids_set_default(ifmsh);
 626        setup_timer(&ifmsh->mesh_path_timer,
 627                    ieee80211_mesh_path_timer,
 628                    (unsigned long) sdata);
 629        INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 630        spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 631}
 632
 633ieee80211_rx_result
 634ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 635                       struct ieee80211_rx_status *rx_status)
 636{
 637        struct ieee80211_local *local = sdata->local;
 638        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 639        struct ieee80211_mgmt *mgmt;
 640        u16 fc;
 641
 642        if (skb->len < 24)
 643                return RX_DROP_MONITOR;
 644
 645        mgmt = (struct ieee80211_mgmt *) skb->data;
 646        fc = le16_to_cpu(mgmt->frame_control);
 647
 648        switch (fc & IEEE80211_FCTL_STYPE) {
 649        case IEEE80211_STYPE_PROBE_RESP:
 650        case IEEE80211_STYPE_BEACON:
 651        case IEEE80211_STYPE_ACTION:
 652                memcpy(skb->cb, rx_status, sizeof(*rx_status));
 653                skb_queue_tail(&ifmsh->skb_queue, skb);
 654                queue_work(local->hw.workqueue, &ifmsh->work);
 655                return RX_QUEUED;
 656        }
 657
 658        return RX_CONTINUE;
 659}
 660