linux/net/mac80211/mesh.c
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   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
  20int mesh_allocated;
  21static struct kmem_cache *rm_cache;
  22
  23#ifdef CONFIG_MAC80211_MESH
  24bool 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
  30bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  31{ return false; }
  32#endif
  33
  34void 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
  42void ieee80211s_stop(void)
  43{
  44        mesh_pathtbl_unregister();
  45        kmem_cache_destroy(rm_cache);
  46}
  47
  48static 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 */
  73bool 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;
 120mismatch:
 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 */
 129bool 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 */
 142u32 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
 163int 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
 176void 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 */
 207int 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
 242int
 243mesh_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
 282int
 283mesh_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
 300int
 301mesh_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
 324int
 325mesh_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
 353int 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
 375int 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
 396int 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}
 420static 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
 435static 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
 452void 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 */
 473int 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 */
 506int 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
 529static 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
 544static 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
 561void 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
 575void 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
 589void 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
 623void 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
 657static 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
 706static 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
 728void 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
 751void 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
 776void 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
 787void 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}
 816
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