mesh.c

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/*
 * Copyright (c) 2008, 2009 open80211s Ltd.
 * Authors:    Luis Carlos Cobo <[email protected]>
 *         Javier Cardona <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/slab.h>
#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "mesh.h"

#define TMR_RUNNING_HK  0
#define TMR_RUNNING_MP  1
#define TMR_RUNNING_MPR 2

int mesh_allocated;
static struct kmem_cache *rm_cache;

#ifdef CONFIG_MAC80211_MESH
bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
{
    return (mgmt->u.action.u.mesh_action.action_code ==
            WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
}
#else
bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
{ return false; }
#endif

void ieee80211s_init(void)
{
    mesh_pathtbl_init();
    mesh_allocated = 1;
    rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
                     0, 0, NULL);
}

void ieee80211s_stop(void)
{
    mesh_pathtbl_unregister();
    kmem_cache_destroy(rm_cache);
}

static void ieee80211_mesh_housekeeping_timer(unsigned long data)
{
    struct ieee80211_sub_if_data *sdata = (void *) data;
    struct ieee80211_local *local = sdata->local;
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

    set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);

    if (local->quiescing) {
        set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
        return;
    }

    ieee80211_queue_work(&local->hw, &sdata->work);
}

bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
            struct ieee802_11_elems *ie)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
    struct ieee80211_local *local = sdata->local;
    u32 basic_rates = 0;
    enum nl80211_channel_type sta_channel_type = NL80211_CHAN_NO_HT;

    /*
     * As support for each feature is added, check for matching
     * - On mesh config capabilities
     *   - Power Save Support En
     *   - Sync support enabled
     *   - Sync support active
     *   - Sync support required from peer
     *   - MDA enabled
     * - Power management control on fc
     */
    if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
         memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
         (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
         (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
         (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
         (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
         (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
        goto mismatch;

    ieee80211_sta_get_rates(local, ie, local->oper_channel->band,
                &basic_rates);

    if (sdata->vif.bss_conf.basic_rates != basic_rates)
        goto mismatch;

    if (ie->ht_operation)
        sta_channel_type =
            ieee80211_ht_oper_to_channel_type(ie->ht_operation);

    /* Disallow HT40+/- mismatch */
    if (ie->ht_operation &&
        (sdata->vif.bss_conf.channel_type == NL80211_CHAN_HT40MINUS ||
         sdata->vif.bss_conf.channel_type == NL80211_CHAN_HT40PLUS) &&
        (sta_channel_type == NL80211_CHAN_HT40MINUS ||
         sta_channel_type == NL80211_CHAN_HT40PLUS) &&
        sdata->vif.bss_conf.channel_type != sta_channel_type)
        goto mismatch;

    return true;
mismatch:
    return false;
}

bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
{
    return (ie->mesh_config->meshconf_cap &
        MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
}

u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
{
    bool free_plinks;
    u32 changed = 0;

    /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
     * the mesh interface might be able to establish plinks with peers that
     * are already on the table but are not on PLINK_ESTAB state. However,
     * in general the mesh interface is not accepting peer link requests
     * from new peers, and that must be reflected in the beacon
     */
    free_plinks = mesh_plink_availables(sdata);

    if (free_plinks != sdata->u.mesh.accepting_plinks) {
        sdata->u.mesh.accepting_plinks = free_plinks;
        changed = BSS_CHANGED_BEACON;
    }

    return changed;
}

int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
{
    int i;

    sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
    if (!sdata->u.mesh.rmc)
        return -ENOMEM;
    sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
    for (i = 0; i < RMC_BUCKETS; i++)
        INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
    return 0;
}

void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
{
    struct mesh_rmc *rmc = sdata->u.mesh.rmc;
    struct rmc_entry *p, *n;
    int i;

    if (!sdata->u.mesh.rmc)
        return;

    for (i = 0; i < RMC_BUCKETS; i++)
        list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
            list_del(&p->list);
            kmem_cache_free(rm_cache, p);
        }

    kfree(rmc);
    sdata->u.mesh.rmc = NULL;
}

int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
           struct ieee80211_sub_if_data *sdata)
{
    struct mesh_rmc *rmc = sdata->u.mesh.rmc;
    u32 seqnum = 0;
    int entries = 0;
    u8 idx;
    struct rmc_entry *p, *n;

    /* Don't care about endianness since only match matters */
    memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
    idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
    list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
        ++entries;
        if (time_after(jiffies, p->exp_time) ||
                (entries == RMC_QUEUE_MAX_LEN)) {
            list_del(&p->list);
            kmem_cache_free(rm_cache, p);
            --entries;
        } else if ((seqnum == p->seqnum) &&
               (ether_addr_equal(sa, p->sa)))
            return -1;
    }

    p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
    if (!p)
        return 0;

    p->seqnum = seqnum;
    p->exp_time = jiffies + RMC_TIMEOUT;
    memcpy(p->sa, sa, ETH_ALEN);
    list_add(&p->list, &rmc->bucket[idx].list);
    return 0;
}

int
mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
    u8 *pos, neighbors;
    u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);

    if (skb_tailroom(skb) < 2 + meshconf_len)
        return -ENOMEM;

    pos = skb_put(skb, 2 + meshconf_len);
    *pos++ = WLAN_EID_MESH_CONFIG;
    *pos++ = meshconf_len;

    /* Active path selection protocol ID */
    *pos++ = ifmsh->mesh_pp_id;
    /* Active path selection metric ID   */
    *pos++ = ifmsh->mesh_pm_id;
    /* Congestion control mode identifier */
    *pos++ = ifmsh->mesh_cc_id;
    /* Synchronization protocol identifier */
    *pos++ = ifmsh->mesh_sp_id;
    /* Authentication Protocol identifier */
    *pos++ = ifmsh->mesh_auth_id;
    /* Mesh Formation Info - number of neighbors */
    neighbors = atomic_read(&ifmsh->mshstats.estab_plinks);
    /* Number of neighbor mesh STAs or 15 whichever is smaller */
    neighbors = (neighbors > 15) ? 15 : neighbors;
    *pos++ = neighbors << 1;
    /* Mesh capability */
    *pos = MESHCONF_CAPAB_FORWARDING;
    *pos |= ifmsh->accepting_plinks ?
        MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
    *pos++ |= ifmsh->adjusting_tbtt ?
        MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
    *pos++ = 0x00;

    return 0;
}

int
mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
    u8 *pos;

    if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
        return -ENOMEM;

    pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
    *pos++ = WLAN_EID_MESH_ID;
    *pos++ = ifmsh->mesh_id_len;
    if (ifmsh->mesh_id_len)
        memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);

    return 0;
}

int
mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
    u8 offset, len;
    const u8 *data;

    if (!ifmsh->ie || !ifmsh->ie_len)
        return 0;

    /* fast-forward to vendor IEs */
    offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);

    if (offset) {
        len = ifmsh->ie_len - offset;
        data = ifmsh->ie + offset;
        if (skb_tailroom(skb) < len)
            return -ENOMEM;
        memcpy(skb_put(skb, len), data, len);
    }

    return 0;
}

int
mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
    u8 len = 0;
    const u8 *data;

    if (!ifmsh->ie || !ifmsh->ie_len)
        return 0;

    /* find RSN IE */
    data = ifmsh->ie;
    while (data < ifmsh->ie + ifmsh->ie_len) {
        if (*data == WLAN_EID_RSN) {
            len = data[1] + 2;
            break;
        }
        data++;
    }

    if (len) {
        if (skb_tailroom(skb) < len)
            return -ENOMEM;
        memcpy(skb_put(skb, len), data, len);
    }

    return 0;
}

int mesh_add_ds_params_ie(struct sk_buff *skb,
              struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_local *local = sdata->local;
    struct ieee80211_supported_band *sband;
    struct ieee80211_channel *chan = local->oper_channel;
    u8 *pos;

    if (skb_tailroom(skb) < 3)
        return -ENOMEM;

    sband = local->hw.wiphy->bands[chan->band];
    if (sband->band == IEEE80211_BAND_2GHZ) {
        pos = skb_put(skb, 2 + 1);
        *pos++ = WLAN_EID_DS_PARAMS;
        *pos++ = 1;
        *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
    }

    return 0;
}

int mesh_add_ht_cap_ie(struct sk_buff *skb,
               struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_local *local = sdata->local;
    struct ieee80211_supported_band *sband;
    u8 *pos;

    sband = local->hw.wiphy->bands[local->oper_channel->band];
    if (!sband->ht_cap.ht_supported ||
        sdata->vif.bss_conf.channel_type == NL80211_CHAN_NO_HT)
        return 0;

    if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
        return -ENOMEM;

    pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
    ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);

    return 0;
}

int mesh_add_ht_oper_ie(struct sk_buff *skb,
            struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_local *local = sdata->local;
    struct ieee80211_channel *channel = local->oper_channel;
    enum nl80211_channel_type channel_type =
                sdata->vif.bss_conf.channel_type;
    struct ieee80211_supported_band *sband =
                local->hw.wiphy->bands[channel->band];
    struct ieee80211_sta_ht_cap *ht_cap = &sband->ht_cap;
    u8 *pos;

    if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
        return 0;

    if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
        return -ENOMEM;

    pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
    ieee80211_ie_build_ht_oper(pos, ht_cap, channel, channel_type,
                   sdata->vif.bss_conf.ht_operation_mode);

    return 0;
}
static void ieee80211_mesh_path_timer(unsigned long data)
{
    struct ieee80211_sub_if_data *sdata =
        (struct ieee80211_sub_if_data *) data;
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
    struct ieee80211_local *local = sdata->local;

    if (local->quiescing) {
        set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
        return;
    }

    ieee80211_queue_work(&local->hw, &sdata->work);
}

static void ieee80211_mesh_path_root_timer(unsigned long data)
{
    struct ieee80211_sub_if_data *sdata =
        (struct ieee80211_sub_if_data *) data;
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
    struct ieee80211_local *local = sdata->local;

    set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);

    if (local->quiescing) {
        set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
        return;
    }

    ieee80211_queue_work(&local->hw, &sdata->work);
}

void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
{
    if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
        set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
    else {
        clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
        /* stop running timer */
        del_timer_sync(&ifmsh->mesh_path_root_timer);
    }
}

int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
                  const u8 *meshda, const u8 *meshsa)
{
    if (is_multicast_ether_addr(meshda)) {
        *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
        /* DA TA SA */
        memcpy(hdr->addr1, meshda, ETH_ALEN);
        memcpy(hdr->addr2, meshsa, ETH_ALEN);
        memcpy(hdr->addr3, meshsa, ETH_ALEN);
        return 24;
    } else {
        *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
        /* RA TA DA SA */
        memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
        memcpy(hdr->addr2, meshsa, ETH_ALEN);
        memcpy(hdr->addr3, meshda, ETH_ALEN);
        memcpy(hdr->addr4, meshsa, ETH_ALEN);
        return 30;
    }
}

int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
        struct ieee80211_sub_if_data *sdata, char *addr4or5,
        char *addr6)
{
    int aelen = 0;
    BUG_ON(!addr4or5 && addr6);
    memset(meshhdr, 0, sizeof(*meshhdr));
    meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
    put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
    sdata->u.mesh.mesh_seqnum++;
    if (addr4or5 && !addr6) {
        meshhdr->flags |= MESH_FLAGS_AE_A4;
        aelen += ETH_ALEN;
        memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
    } else if (addr4or5 && addr6) {
        meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
        aelen += 2 * ETH_ALEN;
        memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
        memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
    }
    return 6 + aelen;
}

static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
               struct ieee80211_if_mesh *ifmsh)
{
    u32 changed;

    ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
    mesh_path_expire(sdata);

    changed = mesh_accept_plinks_update(sdata);
    ieee80211_bss_info_change_notify(sdata, changed);

    mod_timer(&ifmsh->housekeeping_timer,
          round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
}

static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
    u32 interval;

    mesh_path_tx_root_frame(sdata);

    if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
        interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
    else
        interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;

    mod_timer(&ifmsh->mesh_path_root_timer,
          round_jiffies(TU_TO_EXP_TIME(interval)));
}

#ifdef CONFIG_PM
void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

    /* use atomic bitops in case all timers fire at the same time */

    if (del_timer_sync(&ifmsh->housekeeping_timer))
        set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
    if (del_timer_sync(&ifmsh->mesh_path_timer))
        set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
    if (del_timer_sync(&ifmsh->mesh_path_root_timer))
        set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
}

void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

    if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
        add_timer(&ifmsh->housekeeping_timer);
    if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
        add_timer(&ifmsh->mesh_path_timer);
    if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
        add_timer(&ifmsh->mesh_path_root_timer);
    ieee80211_mesh_root_setup(ifmsh);
}
#endif

void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
    struct ieee80211_local *local = sdata->local;

    local->fif_other_bss++;
    /* mesh ifaces must set allmulti to forward mcast traffic */
    atomic_inc(&local->iff_allmultis);
    ieee80211_configure_filter(local);

    ifmsh->mesh_cc_id = 0;  /* Disabled */
    ifmsh->mesh_auth_id = 0;    /* Disabled */
    /* register sync ops from extensible synchronization framework */
    ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
    ifmsh->adjusting_tbtt = false;
    ifmsh->sync_offset_clockdrift_max = 0;
    set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
    ieee80211_mesh_root_setup(ifmsh);
    ieee80211_queue_work(&local->hw, &sdata->work);
    sdata->vif.bss_conf.ht_operation_mode =
                ifmsh->mshcfg.ht_opmode;
    sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
    sdata->vif.bss_conf.basic_rates =
        ieee80211_mandatory_rates(sdata->local,
                      sdata->local->oper_channel->band);
    ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
                        BSS_CHANGED_BEACON_ENABLED |
                        BSS_CHANGED_HT |
                        BSS_CHANGED_BASIC_RATES |
                        BSS_CHANGED_BEACON_INT);

    netif_carrier_on(sdata->dev);
}

void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_local *local = sdata->local;
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

    netif_carrier_off(sdata->dev);

    /* stop the beacon */
    ifmsh->mesh_id_len = 0;
    ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);

    /* flush STAs and mpaths on this iface */
    sta_info_flush(sdata->local, sdata);
    mesh_path_flush_by_iface(sdata);

    del_timer_sync(&sdata->u.mesh.housekeeping_timer);
    del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
    del_timer_sync(&sdata->u.mesh.mesh_path_timer);
    /*
     * If the timer fired while we waited for it, it will have
     * requeued the work. Now the work will be running again
     * but will not rearm the timer again because it checks
     * whether the interface is running, which, at this point,
     * it no longer is.
     */
    cancel_work_sync(&sdata->work);

    local->fif_other_bss--;
    atomic_dec(&local->iff_allmultis);
    ieee80211_configure_filter(local);

    sdata->u.mesh.timers_running = 0;
}

static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
                    u16 stype,
                    struct ieee80211_mgmt *mgmt,
                    size_t len,
                    struct ieee80211_rx_status *rx_status)
{
    struct ieee80211_local *local = sdata->local;
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
    struct ieee802_11_elems elems;
    struct ieee80211_channel *channel;
    size_t baselen;
    int freq;
    enum ieee80211_band band = rx_status->band;

    /* ignore ProbeResp to foreign address */
    if (stype == IEEE80211_STYPE_PROBE_RESP &&
        !ether_addr_equal(mgmt->da, sdata->vif.addr))
        return;

    baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
    if (baselen > len)
        return;

    ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
                   &elems);

    /* ignore beacons from secure mesh peers if our security is off */
    if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
        return;

    if (elems.ds_params && elems.ds_params_len == 1)
        freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
    else
        freq = rx_status->freq;

    channel = ieee80211_get_channel(local->hw.wiphy, freq);

    if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
        return;

    if (elems.mesh_id && elems.mesh_config &&
        mesh_matches_local(sdata, &elems))
        mesh_neighbour_update(sdata, mgmt->sa, &elems);

    if (ifmsh->sync_ops)
        ifmsh->sync_ops->rx_bcn_presp(sdata,
            stype, mgmt, &elems, rx_status);
}

static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
                      struct ieee80211_mgmt *mgmt,
                      size_t len,
                      struct ieee80211_rx_status *rx_status)
{
    switch (mgmt->u.action.category) {
    case WLAN_CATEGORY_SELF_PROTECTED:
        switch (mgmt->u.action.u.self_prot.action_code) {
        case WLAN_SP_MESH_PEERING_OPEN:
        case WLAN_SP_MESH_PEERING_CLOSE:
        case WLAN_SP_MESH_PEERING_CONFIRM:
            mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
            break;
        }
        break;
    case WLAN_CATEGORY_MESH_ACTION:
        if (mesh_action_is_path_sel(mgmt))
            mesh_rx_path_sel_frame(sdata, mgmt, len);
        break;
    }
}

void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                   struct sk_buff *skb)
{
    struct ieee80211_rx_status *rx_status;
    struct ieee80211_mgmt *mgmt;
    u16 stype;

    rx_status = IEEE80211_SKB_RXCB(skb);
    mgmt = (struct ieee80211_mgmt *) skb->data;
    stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;

    switch (stype) {
    case IEEE80211_STYPE_PROBE_RESP:
    case IEEE80211_STYPE_BEACON:
        ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
                        rx_status);
        break;
    case IEEE80211_STYPE_ACTION:
        ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
        break;
    }
}

void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

    if (ifmsh->preq_queue_len &&
        time_after(jiffies,
               ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
        mesh_path_start_discovery(sdata);

    if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
        mesh_mpath_table_grow();

    if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
        mesh_mpp_table_grow();

    if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
        ieee80211_mesh_housekeeping(sdata, ifmsh);

    if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
        ieee80211_mesh_rootpath(sdata);

    if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
        mesh_sync_adjust_tbtt(sdata);
}

void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
{
    struct ieee80211_sub_if_data *sdata;

    rcu_read_lock();
    list_for_each_entry_rcu(sdata, &local->interfaces, list)
        if (ieee80211_vif_is_mesh(&sdata->vif))
            ieee80211_queue_work(&local->hw, &sdata->work);
    rcu_read_unlock();
}

void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
{
    struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

    setup_timer(&ifmsh->housekeeping_timer,
            ieee80211_mesh_housekeeping_timer,
            (unsigned long) sdata);

    ifmsh->accepting_plinks = true;
    ifmsh->preq_id = 0;
    ifmsh->sn = 0;
    ifmsh->num_gates = 0;
    atomic_set(&ifmsh->mpaths, 0);
    mesh_rmc_init(sdata);
    ifmsh->last_preq = jiffies;
    ifmsh->next_perr = jiffies;
    /* Allocate all mesh structures when creating the first mesh interface. */
    if (!mesh_allocated)
        ieee80211s_init();
    setup_timer(&ifmsh->mesh_path_timer,
            ieee80211_mesh_path_timer,
            (unsigned long) sdata);
    setup_timer(&ifmsh->mesh_path_root_timer,
            ieee80211_mesh_path_root_timer,
            (unsigned long) sdata);
    INIT_LIST_HEAD(&ifmsh->preq_queue.list);
    spin_lock_init(&ifmsh->mesh_preq_queue_lock);
    spin_lock_init(&ifmsh->sync_offset_lock);
}