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            (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;
 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 */
 140void 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
 156int 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
 169void 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 */
 200int 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
 235int
 236mesh_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
 276int
 277mesh_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
 294int
 295mesh_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
 318int
 319mesh_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
 347int 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
 368int 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
 389int 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}
 412static 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
 427static 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
 444void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 445{
 446        if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 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 */
 465int 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 */
 498int 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
 521static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 522                           struct ieee80211_if_mesh *ifmsh)
 523{
 524        bool free_plinks;
 525
 526        ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 527        mesh_path_expire(sdata);
 528
 529        free_plinks = mesh_plink_availables(sdata);
 530        if (free_plinks != sdata->u.mesh.accepting_plinks)
 531                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 532
 533        mod_timer(&ifmsh->housekeeping_timer,
 534                  round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 535}
 536
 537static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 538{
 539        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 540        u32 interval;
 541
 542        mesh_path_tx_root_frame(sdata);
 543
 544        if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 545                interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 546        else
 547                interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 548
 549        mod_timer(&ifmsh->mesh_path_root_timer,
 550                  round_jiffies(TU_TO_EXP_TIME(interval)));
 551}
 552
 553#ifdef CONFIG_PM
 554void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 555{
 556        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 557
 558        /* use atomic bitops in case all timers fire at the same time */
 559
 560        if (del_timer_sync(&ifmsh->housekeeping_timer))
 561                set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 562        if (del_timer_sync(&ifmsh->mesh_path_timer))
 563                set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 564        if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 565                set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 566}
 567
 568void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 569{
 570        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 571
 572        if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 573                add_timer(&ifmsh->housekeeping_timer);
 574        if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 575                add_timer(&ifmsh->mesh_path_timer);
 576        if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 577                add_timer(&ifmsh->mesh_path_root_timer);
 578        ieee80211_mesh_root_setup(ifmsh);
 579}
 580#endif
 581
 582void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 583{
 584        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 585        struct ieee80211_local *local = sdata->local;
 586
 587        local->fif_other_bss++;
 588        /* mesh ifaces must set allmulti to forward mcast traffic */
 589        atomic_inc(&local->iff_allmultis);
 590        ieee80211_configure_filter(local);
 591
 592        ifmsh->mesh_cc_id = 0;  /* Disabled */
 593        ifmsh->mesh_auth_id = 0;        /* Disabled */
 594        /* register sync ops from extensible synchronization framework */
 595        ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 596        ifmsh->adjusting_tbtt = false;
 597        ifmsh->sync_offset_clockdrift_max = 0;
 598        set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 599        ieee80211_mesh_root_setup(ifmsh);
 600        ieee80211_queue_work(&local->hw, &sdata->work);
 601        sdata->vif.bss_conf.ht_operation_mode =
 602                                ifmsh->mshcfg.ht_opmode;
 603        sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 604        sdata->vif.bss_conf.basic_rates =
 605                ieee80211_mandatory_rates(sdata->local,
 606                                          sdata->local->hw.conf.channel->band);
 607        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 608                                                BSS_CHANGED_BEACON_ENABLED |
 609                                                BSS_CHANGED_HT |
 610                                                BSS_CHANGED_BASIC_RATES |
 611                                                BSS_CHANGED_BEACON_INT);
 612}
 613
 614void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 615{
 616        struct ieee80211_local *local = sdata->local;
 617        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 618
 619        ifmsh->mesh_id_len = 0;
 620        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 621        sta_info_flush(local, NULL);
 622
 623        del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 624        del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 625        del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 626        /*
 627         * If the timer fired while we waited for it, it will have
 628         * requeued the work. Now the work will be running again
 629         * but will not rearm the timer again because it checks
 630         * whether the interface is running, which, at this point,
 631         * it no longer is.
 632         */
 633        cancel_work_sync(&sdata->work);
 634
 635        local->fif_other_bss--;
 636        atomic_dec(&local->iff_allmultis);
 637        ieee80211_configure_filter(local);
 638
 639        sdata->u.mesh.timers_running = 0;
 640}
 641
 642static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 643                                        u16 stype,
 644                                        struct ieee80211_mgmt *mgmt,
 645                                        size_t len,
 646                                        struct ieee80211_rx_status *rx_status)
 647{
 648        struct ieee80211_local *local = sdata->local;
 649        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 650        struct ieee802_11_elems elems;
 651        struct ieee80211_channel *channel;
 652        size_t baselen;
 653        int freq;
 654        enum ieee80211_band band = rx_status->band;
 655
 656        /* ignore ProbeResp to foreign address */
 657        if (stype == IEEE80211_STYPE_PROBE_RESP &&
 658            !ether_addr_equal(mgmt->da, sdata->vif.addr))
 659                return;
 660
 661        baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 662        if (baselen > len)
 663                return;
 664
 665        ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 666                               &elems);
 667
 668        /* ignore beacons from secure mesh peers if our security is off */
 669        if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
 670                return;
 671
 672        if (elems.ds_params && elems.ds_params_len == 1)
 673                freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 674        else
 675                freq = rx_status->freq;
 676
 677        channel = ieee80211_get_channel(local->hw.wiphy, freq);
 678
 679        if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 680                return;
 681
 682        if (elems.mesh_id && elems.mesh_config &&
 683            mesh_matches_local(sdata, &elems))
 684                mesh_neighbour_update(sdata, mgmt->sa, &elems);
 685
 686        if (ifmsh->sync_ops)
 687                ifmsh->sync_ops->rx_bcn_presp(sdata,
 688                        stype, mgmt, &elems, rx_status);
 689}
 690
 691static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 692                                          struct ieee80211_mgmt *mgmt,
 693                                          size_t len,
 694                                          struct ieee80211_rx_status *rx_status)
 695{
 696        switch (mgmt->u.action.category) {
 697        case WLAN_CATEGORY_SELF_PROTECTED:
 698                switch (mgmt->u.action.u.self_prot.action_code) {
 699                case WLAN_SP_MESH_PEERING_OPEN:
 700                case WLAN_SP_MESH_PEERING_CLOSE:
 701                case WLAN_SP_MESH_PEERING_CONFIRM:
 702                        mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 703                        break;
 704                }
 705                break;
 706        case WLAN_CATEGORY_MESH_ACTION:
 707                if (mesh_action_is_path_sel(mgmt))
 708                        mesh_rx_path_sel_frame(sdata, mgmt, len);
 709                break;
 710        }
 711}
 712
 713void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 714                                   struct sk_buff *skb)
 715{
 716        struct ieee80211_rx_status *rx_status;
 717        struct ieee80211_mgmt *mgmt;
 718        u16 stype;
 719
 720        rx_status = IEEE80211_SKB_RXCB(skb);
 721        mgmt = (struct ieee80211_mgmt *) skb->data;
 722        stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 723
 724        switch (stype) {
 725        case IEEE80211_STYPE_PROBE_RESP:
 726        case IEEE80211_STYPE_BEACON:
 727                ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 728                                            rx_status);
 729                break;
 730        case IEEE80211_STYPE_ACTION:
 731                ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 732                break;
 733        }
 734}
 735
 736void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 737{
 738        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 739
 740        if (ifmsh->preq_queue_len &&
 741            time_after(jiffies,
 742                       ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 743                mesh_path_start_discovery(sdata);
 744
 745        if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 746                mesh_mpath_table_grow();
 747
 748        if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 749                mesh_mpp_table_grow();
 750
 751        if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 752                ieee80211_mesh_housekeeping(sdata, ifmsh);
 753
 754        if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 755                ieee80211_mesh_rootpath(sdata);
 756
 757        if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
 758                mesh_sync_adjust_tbtt(sdata);
 759}
 760
 761void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 762{
 763        struct ieee80211_sub_if_data *sdata;
 764
 765        rcu_read_lock();
 766        list_for_each_entry_rcu(sdata, &local->interfaces, list)
 767                if (ieee80211_vif_is_mesh(&sdata->vif))
 768                        ieee80211_queue_work(&local->hw, &sdata->work);
 769        rcu_read_unlock();
 770}
 771
 772void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 773{
 774        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 775
 776        setup_timer(&ifmsh->housekeeping_timer,
 777                    ieee80211_mesh_housekeeping_timer,
 778                    (unsigned long) sdata);
 779
 780        ifmsh->accepting_plinks = true;
 781        ifmsh->preq_id = 0;
 782        ifmsh->sn = 0;
 783        ifmsh->num_gates = 0;
 784        atomic_set(&ifmsh->mpaths, 0);
 785        mesh_rmc_init(sdata);
 786        ifmsh->last_preq = jiffies;
 787        ifmsh->next_perr = jiffies;
 788        /* Allocate all mesh structures when creating the first mesh interface. */
 789        if (!mesh_allocated)
 790                ieee80211s_init();
 791        setup_timer(&ifmsh->mesh_path_timer,
 792                    ieee80211_mesh_path_timer,
 793                    (unsigned long) sdata);
 794        setup_timer(&ifmsh->mesh_path_root_timer,
 795                    ieee80211_mesh_path_root_timer,
 796                    (unsigned long) sdata);
 797        INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 798        spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 799        spin_lock_init(&ifmsh->sync_offset_lock);
 800}
 801
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