mac80211_hwsim.c

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/*
 * mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
 * Copyright (c) 2008, Jouni Malinen <[email protected]>
 * Copyright (c) 2011, Javier Lopez <[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.
 */

/*
 * TODO:
 * - Add TSF sync and fix IBSS beacon transmission by adding
 *   competition for "air time" at TBTT
 * - RX filtering based on filter configuration (data->rx_filter)
 */

#include <linux/list.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <net/dst.h>
#include <net/xfrm.h>
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/etherdevice.h>
#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/ktime.h>
#include <net/genetlink.h>
#include "mac80211_hwsim.h"

#define WARN_QUEUE 100
#define MAX_QUEUE 200

MODULE_AUTHOR("Jouni Malinen");
MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
MODULE_LICENSE("GPL");

static u32 wmediumd_portid;

static int radios = 2;
module_param(radios, int, 0444);
MODULE_PARM_DESC(radios, "Number of simulated radios");

static bool fake_hw_scan;
module_param(fake_hw_scan, bool, 0444);
MODULE_PARM_DESC(fake_hw_scan, "Install fake (no-op) hw-scan handler");

enum hwsim_regtest {
    HWSIM_REGTEST_DISABLED = 0,
    HWSIM_REGTEST_DRIVER_REG_FOLLOW = 1,
    HWSIM_REGTEST_DRIVER_REG_ALL = 2,
    HWSIM_REGTEST_DIFF_COUNTRY = 3,
    HWSIM_REGTEST_WORLD_ROAM = 4,
    HWSIM_REGTEST_CUSTOM_WORLD = 5,
    HWSIM_REGTEST_CUSTOM_WORLD_2 = 6,
    HWSIM_REGTEST_STRICT_FOLLOW = 7,
    HWSIM_REGTEST_STRICT_ALL = 8,
    HWSIM_REGTEST_STRICT_AND_DRIVER_REG = 9,
    HWSIM_REGTEST_ALL = 10,
};

/* Set to one of the HWSIM_REGTEST_* values above */
static int regtest = HWSIM_REGTEST_DISABLED;
module_param(regtest, int, 0444);
MODULE_PARM_DESC(regtest, "The type of regulatory test we want to run");

static const char *hwsim_alpha2s[] = {
    "FI",
    "AL",
    "US",
    "DE",
    "JP",
    "AL",
};

static const struct ieee80211_regdomain hwsim_world_regdom_custom_01 = {
    .n_reg_rules = 4,
    .alpha2 =  "99",
    .reg_rules = {
        REG_RULE(2412-10, 2462+10, 40, 0, 20, 0),
        REG_RULE(2484-10, 2484+10, 40, 0, 20, 0),
        REG_RULE(5150-10, 5240+10, 40, 0, 30, 0),
        REG_RULE(5745-10, 5825+10, 40, 0, 30, 0),
    }
};

static const struct ieee80211_regdomain hwsim_world_regdom_custom_02 = {
    .n_reg_rules = 2,
    .alpha2 =  "99",
    .reg_rules = {
        REG_RULE(2412-10, 2462+10, 40, 0, 20, 0),
        REG_RULE(5725-10, 5850+10, 40, 0, 30,
            NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS),
    }
};

struct hwsim_vif_priv {
    u32 magic;
    u8 bssid[ETH_ALEN];
    bool assoc;
    u16 aid;
};

#define HWSIM_VIF_MAGIC 0x69537748

static inline void hwsim_check_magic(struct ieee80211_vif *vif)
{
    struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
    WARN_ON(vp->magic != HWSIM_VIF_MAGIC);
}

static inline void hwsim_set_magic(struct ieee80211_vif *vif)
{
    struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
    vp->magic = HWSIM_VIF_MAGIC;
}

static inline void hwsim_clear_magic(struct ieee80211_vif *vif)
{
    struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
    vp->magic = 0;
}

struct hwsim_sta_priv {
    u32 magic;
};

#define HWSIM_STA_MAGIC 0x6d537748

static inline void hwsim_check_sta_magic(struct ieee80211_sta *sta)
{
    struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
    WARN_ON(sp->magic != HWSIM_STA_MAGIC);
}

static inline void hwsim_set_sta_magic(struct ieee80211_sta *sta)
{
    struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
    sp->magic = HWSIM_STA_MAGIC;
}

static inline void hwsim_clear_sta_magic(struct ieee80211_sta *sta)
{
    struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
    sp->magic = 0;
}

static struct class *hwsim_class;

static struct net_device *hwsim_mon; /* global monitor netdev */

#define CHAN2G(_freq)  { \
    .band = IEEE80211_BAND_2GHZ, \
    .center_freq = (_freq), \
    .hw_value = (_freq), \
    .max_power = 20, \
}

#define CHAN5G(_freq) { \
    .band = IEEE80211_BAND_5GHZ, \
    .center_freq = (_freq), \
    .hw_value = (_freq), \
    .max_power = 20, \
}

static const struct ieee80211_channel hwsim_channels_2ghz[] = {
    CHAN2G(2412), /* Channel 1 */
    CHAN2G(2417), /* Channel 2 */
    CHAN2G(2422), /* Channel 3 */
    CHAN2G(2427), /* Channel 4 */
    CHAN2G(2432), /* Channel 5 */
    CHAN2G(2437), /* Channel 6 */
    CHAN2G(2442), /* Channel 7 */
    CHAN2G(2447), /* Channel 8 */
    CHAN2G(2452), /* Channel 9 */
    CHAN2G(2457), /* Channel 10 */
    CHAN2G(2462), /* Channel 11 */
    CHAN2G(2467), /* Channel 12 */
    CHAN2G(2472), /* Channel 13 */
    CHAN2G(2484), /* Channel 14 */
};

static const struct ieee80211_channel hwsim_channels_5ghz[] = {
    CHAN5G(5180), /* Channel 36 */
    CHAN5G(5200), /* Channel 40 */
    CHAN5G(5220), /* Channel 44 */
    CHAN5G(5240), /* Channel 48 */

    CHAN5G(5260), /* Channel 52 */
    CHAN5G(5280), /* Channel 56 */
    CHAN5G(5300), /* Channel 60 */
    CHAN5G(5320), /* Channel 64 */

    CHAN5G(5500), /* Channel 100 */
    CHAN5G(5520), /* Channel 104 */
    CHAN5G(5540), /* Channel 108 */
    CHAN5G(5560), /* Channel 112 */
    CHAN5G(5580), /* Channel 116 */
    CHAN5G(5600), /* Channel 120 */
    CHAN5G(5620), /* Channel 124 */
    CHAN5G(5640), /* Channel 128 */
    CHAN5G(5660), /* Channel 132 */
    CHAN5G(5680), /* Channel 136 */
    CHAN5G(5700), /* Channel 140 */

    CHAN5G(5745), /* Channel 149 */
    CHAN5G(5765), /* Channel 153 */
    CHAN5G(5785), /* Channel 157 */
    CHAN5G(5805), /* Channel 161 */
    CHAN5G(5825), /* Channel 165 */
};

static const struct ieee80211_rate hwsim_rates[] = {
    { .bitrate = 10 },
    { .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 60 },
    { .bitrate = 90 },
    { .bitrate = 120 },
    { .bitrate = 180 },
    { .bitrate = 240 },
    { .bitrate = 360 },
    { .bitrate = 480 },
    { .bitrate = 540 }
};

static spinlock_t hwsim_radio_lock;
static struct list_head hwsim_radios;

struct mac80211_hwsim_data {
    struct list_head list;
    struct ieee80211_hw *hw;
    struct device *dev;
    struct ieee80211_supported_band bands[IEEE80211_NUM_BANDS];
    struct ieee80211_channel channels_2ghz[ARRAY_SIZE(hwsim_channels_2ghz)];
    struct ieee80211_channel channels_5ghz[ARRAY_SIZE(hwsim_channels_5ghz)];
    struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];

    struct mac_address addresses[2];

    struct ieee80211_channel *channel;
    unsigned long beacon_int; /* in jiffies unit */
    unsigned int rx_filter;
    bool started, idle, scanning;
    struct mutex mutex;
    struct timer_list beacon_timer;
    enum ps_mode {
        PS_DISABLED, PS_ENABLED, PS_AUTO_POLL, PS_MANUAL_POLL
    } ps;
    bool ps_poll_pending;
    struct dentry *debugfs;
    struct dentry *debugfs_ps;

    struct sk_buff_head pending;    /* packets pending */
    /*
     * Only radios in the same group can communicate together (the
     * channel has to match too). Each bit represents a group. A
     * radio can be in more then one group.
     */
    u64 group;
    struct dentry *debugfs_group;

    int power_level;

    /* difference between this hw's clock and the real clock, in usecs */
    u64 tsf_offset;
};


struct hwsim_radiotap_hdr {
    struct ieee80211_radiotap_header hdr;
    __le64 rt_tsft;
    u8 rt_flags;
    u8 rt_rate;
    __le16 rt_channel;
    __le16 rt_chbitmask;
} __packed;

/* MAC80211_HWSIM netlinf family */
static struct genl_family hwsim_genl_family = {
    .id = GENL_ID_GENERATE,
    .hdrsize = 0,
    .name = "MAC80211_HWSIM",
    .version = 1,
    .maxattr = HWSIM_ATTR_MAX,
};

/* MAC80211_HWSIM netlink policy */

static struct nla_policy hwsim_genl_policy[HWSIM_ATTR_MAX + 1] = {
    [HWSIM_ATTR_ADDR_RECEIVER] = { .type = NLA_UNSPEC,
                       .len = 6*sizeof(u8) },
    [HWSIM_ATTR_ADDR_TRANSMITTER] = { .type = NLA_UNSPEC,
                      .len = 6*sizeof(u8) },
    [HWSIM_ATTR_FRAME] = { .type = NLA_BINARY,
                   .len = IEEE80211_MAX_DATA_LEN },
    [HWSIM_ATTR_FLAGS] = { .type = NLA_U32 },
    [HWSIM_ATTR_RX_RATE] = { .type = NLA_U32 },
    [HWSIM_ATTR_SIGNAL] = { .type = NLA_U32 },
    [HWSIM_ATTR_TX_INFO] = { .type = NLA_UNSPEC,
                 .len = IEEE80211_TX_MAX_RATES*sizeof(
                    struct hwsim_tx_rate)},
    [HWSIM_ATTR_COOKIE] = { .type = NLA_U64 },
};

static netdev_tx_t hwsim_mon_xmit(struct sk_buff *skb,
                    struct net_device *dev)
{
    /* TODO: allow packet injection */
    dev_kfree_skb(skb);
    return NETDEV_TX_OK;
}

static __le64 __mac80211_hwsim_get_tsf(struct mac80211_hwsim_data *data)
{
    struct timeval tv = ktime_to_timeval(ktime_get_real());
    u64 now = tv.tv_sec * USEC_PER_SEC + tv.tv_usec;
    return cpu_to_le64(now + data->tsf_offset);
}

static u64 mac80211_hwsim_get_tsf(struct ieee80211_hw *hw,
        struct ieee80211_vif *vif)
{
    struct mac80211_hwsim_data *data = hw->priv;
    return le64_to_cpu(__mac80211_hwsim_get_tsf(data));
}

static void mac80211_hwsim_set_tsf(struct ieee80211_hw *hw,
        struct ieee80211_vif *vif, u64 tsf)
{
    struct mac80211_hwsim_data *data = hw->priv;
    struct timeval tv = ktime_to_timeval(ktime_get_real());
    u64 now = tv.tv_sec * USEC_PER_SEC + tv.tv_usec;
    data->tsf_offset = tsf - now;
}

static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
                      struct sk_buff *tx_skb)
{
    struct mac80211_hwsim_data *data = hw->priv;
    struct sk_buff *skb;
    struct hwsim_radiotap_hdr *hdr;
    u16 flags;
    struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
    struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);

    if (!netif_running(hwsim_mon))
        return;

    skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
    if (skb == NULL)
        return;

    hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
    hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
    hdr->hdr.it_pad = 0;
    hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
    hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
                      (1 << IEEE80211_RADIOTAP_RATE) |
                      (1 << IEEE80211_RADIOTAP_TSFT) |
                      (1 << IEEE80211_RADIOTAP_CHANNEL));
    hdr->rt_tsft = __mac80211_hwsim_get_tsf(data);
    hdr->rt_flags = 0;
    hdr->rt_rate = txrate->bitrate / 5;
    hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
    flags = IEEE80211_CHAN_2GHZ;
    if (txrate->flags & IEEE80211_RATE_ERP_G)
        flags |= IEEE80211_CHAN_OFDM;
    else
        flags |= IEEE80211_CHAN_CCK;
    hdr->rt_chbitmask = cpu_to_le16(flags);

    skb->dev = hwsim_mon;
    skb_set_mac_header(skb, 0);
    skb->ip_summed = CHECKSUM_UNNECESSARY;
    skb->pkt_type = PACKET_OTHERHOST;
    skb->protocol = htons(ETH_P_802_2);
    memset(skb->cb, 0, sizeof(skb->cb));
    netif_rx(skb);
}


static void mac80211_hwsim_monitor_ack(struct ieee80211_hw *hw, const u8 *addr)
{
    struct mac80211_hwsim_data *data = hw->priv;
    struct sk_buff *skb;
    struct hwsim_radiotap_hdr *hdr;
    u16 flags;
    struct ieee80211_hdr *hdr11;

    if (!netif_running(hwsim_mon))
        return;

    skb = dev_alloc_skb(100);
    if (skb == NULL)
        return;

    hdr = (struct hwsim_radiotap_hdr *) skb_put(skb, sizeof(*hdr));
    hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
    hdr->hdr.it_pad = 0;
    hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
    hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
                      (1 << IEEE80211_RADIOTAP_CHANNEL));
    hdr->rt_flags = 0;
    hdr->rt_rate = 0;
    hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
    flags = IEEE80211_CHAN_2GHZ;
    hdr->rt_chbitmask = cpu_to_le16(flags);

    hdr11 = (struct ieee80211_hdr *) skb_put(skb, 10);
    hdr11->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
                       IEEE80211_STYPE_ACK);
    hdr11->duration_id = cpu_to_le16(0);
    memcpy(hdr11->addr1, addr, ETH_ALEN);

    skb->dev = hwsim_mon;
    skb_set_mac_header(skb, 0);
    skb->ip_summed = CHECKSUM_UNNECESSARY;
    skb->pkt_type = PACKET_OTHERHOST;
    skb->protocol = htons(ETH_P_802_2);
    memset(skb->cb, 0, sizeof(skb->cb));
    netif_rx(skb);
}


static bool hwsim_ps_rx_ok(struct mac80211_hwsim_data *data,
               struct sk_buff *skb)
{
    switch (data->ps) {
    case PS_DISABLED:
        return true;
    case PS_ENABLED:
        return false;
    case PS_AUTO_POLL:
        /* TODO: accept (some) Beacons by default and other frames only
         * if pending PS-Poll has been sent */
        return true;
    case PS_MANUAL_POLL:
        /* Allow unicast frames to own address if there is a pending
         * PS-Poll */
        if (data->ps_poll_pending &&
            memcmp(data->hw->wiphy->perm_addr, skb->data + 4,
               ETH_ALEN) == 0) {
            data->ps_poll_pending = false;
            return true;
        }
        return false;
    }

    return true;
}


struct mac80211_hwsim_addr_match_data {
    bool ret;
    const u8 *addr;
};

static void mac80211_hwsim_addr_iter(void *data, u8 *mac,
                     struct ieee80211_vif *vif)
{
    struct mac80211_hwsim_addr_match_data *md = data;
    if (memcmp(mac, md->addr, ETH_ALEN) == 0)
        md->ret = true;
}


static bool mac80211_hwsim_addr_match(struct mac80211_hwsim_data *data,
                      const u8 *addr)
{
    struct mac80211_hwsim_addr_match_data md;

    if (memcmp(addr, data->hw->wiphy->perm_addr, ETH_ALEN) == 0)
        return true;

    md.ret = false;
    md.addr = addr;
    ieee80211_iterate_active_interfaces_atomic(data->hw,
                           mac80211_hwsim_addr_iter,
                           &md);

    return md.ret;
}

static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw,
                       struct sk_buff *my_skb,
                       int dst_portid)
{
    struct sk_buff *skb;
    struct mac80211_hwsim_data *data = hw->priv;
    struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) my_skb->data;
    struct ieee80211_tx_info *info = IEEE80211_SKB_CB(my_skb);
    void *msg_head;
    unsigned int hwsim_flags = 0;
    int i;
    struct hwsim_tx_rate tx_attempts[IEEE80211_TX_MAX_RATES];

    if (data->idle) {
        wiphy_debug(hw->wiphy, "Trying to TX when idle - reject\n");
        dev_kfree_skb(my_skb);
        return;
    }

    if (data->ps != PS_DISABLED)
        hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
    /* If the queue contains MAX_QUEUE skb's drop some */
    if (skb_queue_len(&data->pending) >= MAX_QUEUE) {
        /* Droping until WARN_QUEUE level */
        while (skb_queue_len(&data->pending) >= WARN_QUEUE)
            skb_dequeue(&data->pending);
    }

    skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_ATOMIC);
    if (skb == NULL)
        goto nla_put_failure;

    msg_head = genlmsg_put(skb, 0, 0, &hwsim_genl_family, 0,
                   HWSIM_CMD_FRAME);
    if (msg_head == NULL) {
        printk(KERN_DEBUG "mac80211_hwsim: problem with msg_head\n");
        goto nla_put_failure;
    }

    if (nla_put(skb, HWSIM_ATTR_ADDR_TRANSMITTER,
            sizeof(struct mac_address), data->addresses[1].addr))
        goto nla_put_failure;

    /* We get the skb->data */
    if (nla_put(skb, HWSIM_ATTR_FRAME, my_skb->len, my_skb->data))
        goto nla_put_failure;

    /* We get the flags for this transmission, and we translate them to
       wmediumd flags  */

    if (info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
        hwsim_flags |= HWSIM_TX_CTL_REQ_TX_STATUS;

    if (info->flags & IEEE80211_TX_CTL_NO_ACK)
        hwsim_flags |= HWSIM_TX_CTL_NO_ACK;

    if (nla_put_u32(skb, HWSIM_ATTR_FLAGS, hwsim_flags))
        goto nla_put_failure;

    /* We get the tx control (rate and retries) info*/

    for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
        tx_attempts[i].idx = info->status.rates[i].idx;
        tx_attempts[i].count = info->status.rates[i].count;
    }

    if (nla_put(skb, HWSIM_ATTR_TX_INFO,
            sizeof(struct hwsim_tx_rate)*IEEE80211_TX_MAX_RATES,
            tx_attempts))
        goto nla_put_failure;

    /* We create a cookie to identify this skb */
    if (nla_put_u64(skb, HWSIM_ATTR_COOKIE, (unsigned long) my_skb))
        goto nla_put_failure;

    genlmsg_end(skb, msg_head);
    genlmsg_unicast(&init_net, skb, dst_portid);

    /* Enqueue the packet */
    skb_queue_tail(&data->pending, my_skb);
    return;

nla_put_failure:
    printk(KERN_DEBUG "mac80211_hwsim: error occurred in %s\n", __func__);
}

static bool mac80211_hwsim_tx_frame_no_nl(struct ieee80211_hw *hw,
                      struct sk_buff *skb)
{
    struct mac80211_hwsim_data *data = hw->priv, *data2;
    bool ack = false;
    struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
    struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
    struct ieee80211_rx_status rx_status;
    struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);

    if (data->idle) {
        wiphy_debug(hw->wiphy, "Trying to TX when idle - reject\n");
        return false;
    }

    memset(&rx_status, 0, sizeof(rx_status));
    rx_status.flag |= RX_FLAG_MACTIME_MPDU;
    rx_status.freq = data->channel->center_freq;
    rx_status.band = data->channel->band;
    rx_status.rate_idx = info->control.rates[0].idx;
    if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
        rx_status.flag |= RX_FLAG_HT;
    if (info->control.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
        rx_status.flag |= RX_FLAG_40MHZ;
    if (info->control.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
        rx_status.flag |= RX_FLAG_SHORT_GI;
    /* TODO: simulate real signal strength (and optional packet loss) */
    rx_status.signal = data->power_level - 50;

    if (data->ps != PS_DISABLED)
        hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);

    /* release the skb's source info */
    skb_orphan(skb);
    skb_dst_drop(skb);
    skb->mark = 0;
    secpath_reset(skb);
    nf_reset(skb);

    /* Copy skb to all enabled radios that are on the current frequency */
    spin_lock(&hwsim_radio_lock);
    list_for_each_entry(data2, &hwsim_radios, list) {
        struct sk_buff *nskb;
        struct ieee80211_mgmt *mgmt;

        if (data == data2)
            continue;

        if (data2->idle || !data2->started ||
            !hwsim_ps_rx_ok(data2, skb) || !data2->channel ||
            data->channel->center_freq != data2->channel->center_freq ||
            !(data->group & data2->group))
            continue;

        nskb = skb_copy(skb, GFP_ATOMIC);
        if (nskb == NULL)
            continue;

        if (mac80211_hwsim_addr_match(data2, hdr->addr1))
            ack = true;

        /* set bcn timestamp relative to receiver mactime */
        rx_status.mactime =
                le64_to_cpu(__mac80211_hwsim_get_tsf(data2));
        mgmt = (struct ieee80211_mgmt *) nskb->data;
        if (ieee80211_is_beacon(mgmt->frame_control) ||
            ieee80211_is_probe_resp(mgmt->frame_control))
            mgmt->u.beacon.timestamp = cpu_to_le64(
                rx_status.mactime +
                (data->tsf_offset - data2->tsf_offset) +
                24 * 8 * 10 / txrate->bitrate);

        memcpy(IEEE80211_SKB_RXCB(nskb), &rx_status, sizeof(rx_status));
        ieee80211_rx_irqsafe(data2->hw, nskb);
    }
    spin_unlock(&hwsim_radio_lock);

    return ack;
}

static void mac80211_hwsim_tx(struct ieee80211_hw *hw,
                  struct ieee80211_tx_control *control,
                  struct sk_buff *skb)
{
    bool ack;
    struct ieee80211_tx_info *txi;
    u32 _portid;

    mac80211_hwsim_monitor_rx(hw, skb);

    if (skb->len < 10) {
        /* Should not happen; just a sanity check for addr1 use */
        dev_kfree_skb(skb);
        return;
    }

    /* wmediumd mode check */
    _portid = ACCESS_ONCE(wmediumd_portid);

    if (_portid)
        return mac80211_hwsim_tx_frame_nl(hw, skb, _portid);

    /* NO wmediumd detected, perfect medium simulation */
    ack = mac80211_hwsim_tx_frame_no_nl(hw, skb);

    if (ack && skb->len >= 16) {
        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
        mac80211_hwsim_monitor_ack(hw, hdr->addr2);
    }

    txi = IEEE80211_SKB_CB(skb);

    ieee80211_tx_info_clear_status(txi);

    /* frame was transmitted at most favorable rate at first attempt */
    txi->control.rates[0].count = 1;
    txi->control.rates[1].idx = -1;

    if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK) && ack)
        txi->flags |= IEEE80211_TX_STAT_ACK;
    ieee80211_tx_status_irqsafe(hw, skb);
}


static int mac80211_hwsim_start(struct ieee80211_hw *hw)
{
    struct mac80211_hwsim_data *data = hw->priv;
    wiphy_debug(hw->wiphy, "%s\n", __func__);
    data->started = true;
    return 0;
}


static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
{
    struct mac80211_hwsim_data *data = hw->priv;
    data->started = false;
    del_timer(&data->beacon_timer);
    wiphy_debug(hw->wiphy, "%s\n", __func__);
}


static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
                    struct ieee80211_vif *vif)
{
    wiphy_debug(hw->wiphy, "%s (type=%d mac_addr=%pM)\n",
            __func__, ieee80211_vif_type_p2p(vif),
            vif->addr);
    hwsim_set_magic(vif);
    return 0;
}


static int mac80211_hwsim_change_interface(struct ieee80211_hw *hw,
                       struct ieee80211_vif *vif,
                       enum nl80211_iftype newtype,
                       bool newp2p)
{
    newtype = ieee80211_iftype_p2p(newtype, newp2p);
    wiphy_debug(hw->wiphy,
            "%s (old type=%d, new type=%d, mac_addr=%pM)\n",
            __func__, ieee80211_vif_type_p2p(vif),
            newtype, vif->addr);
    hwsim_check_magic(vif);

    return 0;
}

static void mac80211_hwsim_remove_interface(
    struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
    wiphy_debug(hw->wiphy, "%s (type=%d mac_addr=%pM)\n",
            __func__, ieee80211_vif_type_p2p(vif),
            vif->addr);
    hwsim_check_magic(vif);
    hwsim_clear_magic(vif);
}


static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
                     struct ieee80211_vif *vif)
{
    struct ieee80211_hw *hw = arg;
    struct sk_buff *skb;
    struct ieee80211_tx_info *info;
    u32 _portid;

    hwsim_check_magic(vif);

    if (vif->type != NL80211_IFTYPE_AP &&
        vif->type != NL80211_IFTYPE_MESH_POINT &&
        vif->type != NL80211_IFTYPE_ADHOC)
        return;

    skb = ieee80211_beacon_get(hw, vif);
    if (skb == NULL)
        return;
    info = IEEE80211_SKB_CB(skb);

    mac80211_hwsim_monitor_rx(hw, skb);

    /* wmediumd mode check */
    _portid = ACCESS_ONCE(wmediumd_portid);

    if (_portid)
        return mac80211_hwsim_tx_frame_nl(hw, skb, _portid);

    mac80211_hwsim_tx_frame_no_nl(hw, skb);
    dev_kfree_skb(skb);
}


static void mac80211_hwsim_beacon(unsigned long arg)
{
    struct ieee80211_hw *hw = (struct ieee80211_hw *) arg;
    struct mac80211_hwsim_data *data = hw->priv;

    if (!data->started)
        return;

    ieee80211_iterate_active_interfaces_atomic(
        hw, mac80211_hwsim_beacon_tx, hw);

    data->beacon_timer.expires = jiffies + data->beacon_int;
    add_timer(&data->beacon_timer);
}

static const char *hwsim_chantypes[] = {
    [NL80211_CHAN_NO_HT] = "noht",
    [NL80211_CHAN_HT20] = "ht20",
    [NL80211_CHAN_HT40MINUS] = "ht40-",
    [NL80211_CHAN_HT40PLUS] = "ht40+",
};

static int mac80211_hwsim_config(struct ieee80211_hw *hw, u32 changed)
{
    struct mac80211_hwsim_data *data = hw->priv;
    struct ieee80211_conf *conf = &hw->conf;
    static const char *smps_modes[IEEE80211_SMPS_NUM_MODES] = {
        [IEEE80211_SMPS_AUTOMATIC] = "auto",
        [IEEE80211_SMPS_OFF] = "off",
        [IEEE80211_SMPS_STATIC] = "static",
        [IEEE80211_SMPS_DYNAMIC] = "dynamic",
    };

    wiphy_debug(hw->wiphy,
            "%s (freq=%d/%s idle=%d ps=%d smps=%s)\n",
            __func__,
            conf->channel->center_freq,
            hwsim_chantypes[conf->channel_type],
            !!(conf->flags & IEEE80211_CONF_IDLE),
            !!(conf->flags & IEEE80211_CONF_PS),
            smps_modes[conf->smps_mode]);

    data->idle = !!(conf->flags & IEEE80211_CONF_IDLE);

    data->channel = conf->channel;
    data->power_level = conf->power_level;
    if (!data->started || !data->beacon_int)
        del_timer(&data->beacon_timer);
    else
        mod_timer(&data->beacon_timer, jiffies + data->beacon_int);

    return 0;
}


static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
                        unsigned int changed_flags,
                        unsigned int *total_flags,u64 multicast)
{
    struct mac80211_hwsim_data *data = hw->priv;

    wiphy_debug(hw->wiphy, "%s\n", __func__);

    data->rx_filter = 0;
    if (*total_flags & FIF_PROMISC_IN_BSS)
        data->rx_filter |= FIF_PROMISC_IN_BSS;
    if (*total_flags & FIF_ALLMULTI)
        data->rx_filter |= FIF_ALLMULTI;

    *total_flags = data->rx_filter;
}

static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
                        struct ieee80211_vif *vif,
                        struct ieee80211_bss_conf *info,
                        u32 changed)
{
    struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
    struct mac80211_hwsim_data *data = hw->priv;

    hwsim_check_magic(vif);

    wiphy_debug(hw->wiphy, "%s(changed=0x%x)\n", __func__, changed);

    if (changed & BSS_CHANGED_BSSID) {
        wiphy_debug(hw->wiphy, "%s: BSSID changed: %pM\n",
                __func__, info->bssid);
        memcpy(vp->bssid, info->bssid, ETH_ALEN);
    }

    if (changed & BSS_CHANGED_ASSOC) {
        wiphy_debug(hw->wiphy, "  ASSOC: assoc=%d aid=%d\n",
                info->assoc, info->aid);
        vp->assoc = info->assoc;
        vp->aid = info->aid;
    }

    if (changed & BSS_CHANGED_BEACON_INT) {
        wiphy_debug(hw->wiphy, "  BCNINT: %d\n", info->beacon_int);
        data->beacon_int = 1024 * info->beacon_int / 1000 * HZ / 1000;
        if (WARN_ON(!data->beacon_int))
            data->beacon_int = 1;
        if (data->started)
            mod_timer(&data->beacon_timer,
                  jiffies + data->beacon_int);
    }

    if (changed & BSS_CHANGED_ERP_CTS_PROT) {
        wiphy_debug(hw->wiphy, "  ERP_CTS_PROT: %d\n",
                info->use_cts_prot);
    }

    if (changed & BSS_CHANGED_ERP_PREAMBLE) {
        wiphy_debug(hw->wiphy, "  ERP_PREAMBLE: %d\n",
                info->use_short_preamble);
    }

    if (changed & BSS_CHANGED_ERP_SLOT) {
        wiphy_debug(hw->wiphy, "  ERP_SLOT: %d\n", info->use_short_slot);
    }

    if (changed & BSS_CHANGED_HT) {
        wiphy_debug(hw->wiphy, "  HT: op_mode=0x%x, chantype=%s\n",
                info->ht_operation_mode,
                hwsim_chantypes[info->channel_type]);
    }

    if (changed & BSS_CHANGED_BASIC_RATES) {
        wiphy_debug(hw->wiphy, "  BASIC_RATES: 0x%llx\n",
                (unsigned long long) info->basic_rates);
    }
}

static int mac80211_hwsim_sta_add(struct ieee80211_hw *hw,
                  struct ieee80211_vif *vif,
                  struct ieee80211_sta *sta)
{
    hwsim_check_magic(vif);
    hwsim_set_sta_magic(sta);

    return 0;
}

static int mac80211_hwsim_sta_remove(struct ieee80211_hw *hw,
                     struct ieee80211_vif *vif,
                     struct ieee80211_sta *sta)
{
    hwsim_check_magic(vif);
    hwsim_clear_sta_magic(sta);

    return 0;
}

static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
                      struct ieee80211_vif *vif,
                      enum sta_notify_cmd cmd,
                      struct ieee80211_sta *sta)
{
    hwsim_check_magic(vif);

    switch (cmd) {
    case STA_NOTIFY_SLEEP:
    case STA_NOTIFY_AWAKE:
        /* TODO: make good use of these flags */
        break;
    default:
        WARN(1, "Invalid sta notify: %d\n", cmd);
        break;
    }
}

static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw,
                  struct ieee80211_sta *sta,
                  bool set)
{
    hwsim_check_sta_magic(sta);
    return 0;
}

static int mac80211_hwsim_conf_tx(
    struct ieee80211_hw *hw,
    struct ieee80211_vif *vif, u16 queue,
    const struct ieee80211_tx_queue_params *params)
{
    wiphy_debug(hw->wiphy,
            "%s (queue=%d txop=%d cw_min=%d cw_max=%d aifs=%d)\n",
            __func__, queue,
            params->txop, params->cw_min,
            params->cw_max, params->aifs);
    return 0;
}

static int mac80211_hwsim_get_survey(
    struct ieee80211_hw *hw, int idx,
    struct survey_info *survey)
{
    struct ieee80211_conf *conf = &hw->conf;

    wiphy_debug(hw->wiphy, "%s (idx=%d)\n", __func__, idx);

    if (idx != 0)
        return -ENOENT;

    /* Current channel */
    survey->channel = conf->channel;

    /*
     * Magically conjured noise level --- this is only ok for simulated hardware.
     *
     * A real driver which cannot determine the real channel noise MUST NOT
     * report any noise, especially not a magically conjured one :-)
     */
    survey->filled = SURVEY_INFO_NOISE_DBM;
    survey->noise = -92;

    return 0;
}

#ifdef CONFIG_NL80211_TESTMODE
/*
 * This section contains example code for using netlink
 * attributes with the testmode command in nl80211.
 */

/* These enums need to be kept in sync with userspace */
enum hwsim_testmode_attr {
    __HWSIM_TM_ATTR_INVALID = 0,
    HWSIM_TM_ATTR_CMD   = 1,
    HWSIM_TM_ATTR_PS    = 2,

    /* keep last */
    __HWSIM_TM_ATTR_AFTER_LAST,
    HWSIM_TM_ATTR_MAX   = __HWSIM_TM_ATTR_AFTER_LAST - 1
};

enum hwsim_testmode_cmd {
    HWSIM_TM_CMD_SET_PS     = 0,
    HWSIM_TM_CMD_GET_PS     = 1,
    HWSIM_TM_CMD_STOP_QUEUES    = 2,
    HWSIM_TM_CMD_WAKE_QUEUES    = 3,
};

static const struct nla_policy hwsim_testmode_policy[HWSIM_TM_ATTR_MAX + 1] = {
    [HWSIM_TM_ATTR_CMD] = { .type = NLA_U32 },
    [HWSIM_TM_ATTR_PS] = { .type = NLA_U32 },
};

static int hwsim_fops_ps_write(void *dat, u64 val);

static int mac80211_hwsim_testmode_cmd(struct ieee80211_hw *hw,
                       void *data, int len)
{
    struct mac80211_hwsim_data *hwsim = hw->priv;
    struct nlattr *tb[HWSIM_TM_ATTR_MAX + 1];
    struct sk_buff *skb;
    int err, ps;

    err = nla_parse(tb, HWSIM_TM_ATTR_MAX, data, len,
            hwsim_testmode_policy);
    if (err)
        return err;

    if (!tb[HWSIM_TM_ATTR_CMD])
        return -EINVAL;

    switch (nla_get_u32(tb[HWSIM_TM_ATTR_CMD])) {
    case HWSIM_TM_CMD_SET_PS:
        if (!tb[HWSIM_TM_ATTR_PS])
            return -EINVAL;
        ps = nla_get_u32(tb[HWSIM_TM_ATTR_PS]);
        return hwsim_fops_ps_write(hwsim, ps);
    case HWSIM_TM_CMD_GET_PS:
        skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
                        nla_total_size(sizeof(u32)));
        if (!skb)
            return -ENOMEM;
        if (nla_put_u32(skb, HWSIM_TM_ATTR_PS, hwsim->ps))
            goto nla_put_failure;
        return cfg80211_testmode_reply(skb);
    case HWSIM_TM_CMD_STOP_QUEUES:
        ieee80211_stop_queues(hw);
        return 0;
    case HWSIM_TM_CMD_WAKE_QUEUES:
        ieee80211_wake_queues(hw);
        return 0;
    default:
        return -EOPNOTSUPP;
    }

 nla_put_failure:
    kfree_skb(skb);
    return -ENOBUFS;
}
#endif

static int mac80211_hwsim_ampdu_action(struct ieee80211_hw *hw,
                       struct ieee80211_vif *vif,
                       enum ieee80211_ampdu_mlme_action action,
                       struct ieee80211_sta *sta, u16 tid, u16 *ssn,
                       u8 buf_size)
{
    switch (action) {
    case IEEE80211_AMPDU_TX_START:
        ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
        break;
    case IEEE80211_AMPDU_TX_STOP:
        ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
        break;
    case IEEE80211_AMPDU_TX_OPERATIONAL:
        break;
    case IEEE80211_AMPDU_RX_START:
    case IEEE80211_AMPDU_RX_STOP:
        break;
    default:
        return -EOPNOTSUPP;
    }

    return 0;
}

static void mac80211_hwsim_flush(struct ieee80211_hw *hw, bool drop)
{
    /* Not implemented, queues only on kernel side */
}

struct hw_scan_done {
    struct delayed_work w;
    struct ieee80211_hw *hw;
};

static void hw_scan_done(struct work_struct *work)
{
    struct hw_scan_done *hsd =
        container_of(work, struct hw_scan_done, w.work);

    ieee80211_scan_completed(hsd->hw, false);
    kfree(hsd);
}

static int mac80211_hwsim_hw_scan(struct ieee80211_hw *hw,
                  struct ieee80211_vif *vif,
                  struct cfg80211_scan_request *req)
{
    struct hw_scan_done *hsd = kzalloc(sizeof(*hsd), GFP_KERNEL);
    int i;

    if (!hsd)
        return -ENOMEM;

    hsd->hw = hw;
    INIT_DELAYED_WORK(&hsd->w, hw_scan_done);

    printk(KERN_DEBUG "hwsim hw_scan request\n");
    for (i = 0; i < req->n_channels; i++)
        printk(KERN_DEBUG "hwsim hw_scan freq %d\n",
            req->channels[i]->center_freq);
    print_hex_dump(KERN_DEBUG, "scan IEs: ", DUMP_PREFIX_OFFSET,
            16, 1, req->ie, req->ie_len, 1);

    ieee80211_queue_delayed_work(hw, &hsd->w, 2 * HZ);

    return 0;
}

static void mac80211_hwsim_sw_scan(struct ieee80211_hw *hw)
{
    struct mac80211_hwsim_data *hwsim = hw->priv;

    mutex_lock(&hwsim->mutex);

    if (hwsim->scanning) {
        printk(KERN_DEBUG "two hwsim sw_scans detected!\n");
        goto out;
    }

    printk(KERN_DEBUG "hwsim sw_scan request, prepping stuff\n");
    hwsim->scanning = true;

out:
    mutex_unlock(&hwsim->mutex);
}

static void mac80211_hwsim_sw_scan_complete(struct ieee80211_hw *hw)
{
    struct mac80211_hwsim_data *hwsim = hw->priv;

    mutex_lock(&hwsim->mutex);

    printk(KERN_DEBUG "hwsim sw_scan_complete\n");
    hwsim->scanning = false;

    mutex_unlock(&hwsim->mutex);
}

static struct ieee80211_ops mac80211_hwsim_ops =
{
    .tx = mac80211_hwsim_tx,
    .start = mac80211_hwsim_start,
    .stop = mac80211_hwsim_stop,
    .add_interface = mac80211_hwsim_add_interface,
    .change_interface = mac80211_hwsim_change_interface,
    .remove_interface = mac80211_hwsim_remove_interface,
    .config = mac80211_hwsim_config,
    .configure_filter = mac80211_hwsim_configure_filter,
    .bss_info_changed = mac80211_hwsim_bss_info_changed,
    .sta_add = mac80211_hwsim_sta_add,
    .sta_remove = mac80211_hwsim_sta_remove,
    .sta_notify = mac80211_hwsim_sta_notify,
    .set_tim = mac80211_hwsim_set_tim,
    .conf_tx = mac80211_hwsim_conf_tx,
    .get_survey = mac80211_hwsim_get_survey,
    CFG80211_TESTMODE_CMD(mac80211_hwsim_testmode_cmd)
    .ampdu_action = mac80211_hwsim_ampdu_action,
    .sw_scan_start = mac80211_hwsim_sw_scan,
    .sw_scan_complete = mac80211_hwsim_sw_scan_complete,
    .flush = mac80211_hwsim_flush,
    .get_tsf = mac80211_hwsim_get_tsf,
    .set_tsf = mac80211_hwsim_set_tsf,
};


static void mac80211_hwsim_free(void)
{
    struct list_head tmplist, *i, *tmp;
    struct mac80211_hwsim_data *data, *tmpdata;

    INIT_LIST_HEAD(&tmplist);

    spin_lock_bh(&hwsim_radio_lock);
    list_for_each_safe(i, tmp, &hwsim_radios)
        list_move(i, &tmplist);
    spin_unlock_bh(&hwsim_radio_lock);

    list_for_each_entry_safe(data, tmpdata, &tmplist, list) {
        debugfs_remove(data->debugfs_group);
        debugfs_remove(data->debugfs_ps);
        debugfs_remove(data->debugfs);
        ieee80211_unregister_hw(data->hw);
        device_unregister(data->dev);
        ieee80211_free_hw(data->hw);
    }
    class_destroy(hwsim_class);
}


static struct device_driver mac80211_hwsim_driver = {
    .name = "mac80211_hwsim"
};

static const struct net_device_ops hwsim_netdev_ops = {
    .ndo_start_xmit     = hwsim_mon_xmit,
    .ndo_change_mtu     = eth_change_mtu,
    .ndo_set_mac_address    = eth_mac_addr,
    .ndo_validate_addr  = eth_validate_addr,
};

static void hwsim_mon_setup(struct net_device *dev)
{
    dev->netdev_ops = &hwsim_netdev_ops;
    dev->destructor = free_netdev;
    ether_setup(dev);
    dev->tx_queue_len = 0;
    dev->type = ARPHRD_IEEE80211_RADIOTAP;
    memset(dev->dev_addr, 0, ETH_ALEN);
    dev->dev_addr[0] = 0x12;
}


static void hwsim_send_ps_poll(void *dat, u8 *mac, struct ieee80211_vif *vif)
{
    struct mac80211_hwsim_data *data = dat;
    struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
    struct sk_buff *skb;
    struct ieee80211_pspoll *pspoll;
    u32 _portid;

    if (!vp->assoc)
        return;

    wiphy_debug(data->hw->wiphy,
            "%s: send PS-Poll to %pM for aid %d\n",
            __func__, vp->bssid, vp->aid);

    skb = dev_alloc_skb(sizeof(*pspoll));
    if (!skb)
        return;
    pspoll = (void *) skb_put(skb, sizeof(*pspoll));
    pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
                        IEEE80211_STYPE_PSPOLL |
                        IEEE80211_FCTL_PM);
    pspoll->aid = cpu_to_le16(0xc000 | vp->aid);
    memcpy(pspoll->bssid, vp->bssid, ETH_ALEN);
    memcpy(pspoll->ta, mac, ETH_ALEN);

    /* wmediumd mode check */
    _portid = ACCESS_ONCE(wmediumd_portid);

    if (_portid)
        return mac80211_hwsim_tx_frame_nl(data->hw, skb, _portid);

    if (!mac80211_hwsim_tx_frame_no_nl(data->hw, skb))
        printk(KERN_DEBUG "%s: PS-poll frame not ack'ed\n", __func__);
    dev_kfree_skb(skb);
}


static void hwsim_send_nullfunc(struct mac80211_hwsim_data *data, u8 *mac,
                struct ieee80211_vif *vif, int ps)
{
    struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
    struct sk_buff *skb;
    struct ieee80211_hdr *hdr;
    u32 _portid;

    if (!vp->assoc)
        return;

    wiphy_debug(data->hw->wiphy,
            "%s: send data::nullfunc to %pM ps=%d\n",
            __func__, vp->bssid, ps);

    skb = dev_alloc_skb(sizeof(*hdr));
    if (!skb)
        return;
    hdr = (void *) skb_put(skb, sizeof(*hdr) - ETH_ALEN);
    hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
                     IEEE80211_STYPE_NULLFUNC |
                     (ps ? IEEE80211_FCTL_PM : 0));
    hdr->duration_id = cpu_to_le16(0);
    memcpy(hdr->addr1, vp->bssid, ETH_ALEN);
    memcpy(hdr->addr2, mac, ETH_ALEN);
    memcpy(hdr->addr3, vp->bssid, ETH_ALEN);

    /* wmediumd mode check */
    _portid = ACCESS_ONCE(wmediumd_portid);

    if (_portid)
        return mac80211_hwsim_tx_frame_nl(data->hw, skb, _portid);

    if (!mac80211_hwsim_tx_frame_no_nl(data->hw, skb))
        printk(KERN_DEBUG "%s: nullfunc frame not ack'ed\n", __func__);
    dev_kfree_skb(skb);
}


static void hwsim_send_nullfunc_ps(void *dat, u8 *mac,
                   struct ieee80211_vif *vif)
{
    struct mac80211_hwsim_data *data = dat;
    hwsim_send_nullfunc(data, mac, vif, 1);
}


static void hwsim_send_nullfunc_no_ps(void *dat, u8 *mac,
                      struct ieee80211_vif *vif)
{
    struct mac80211_hwsim_data *data = dat;
    hwsim_send_nullfunc(data, mac, vif, 0);
}


static int hwsim_fops_ps_read(void *dat, u64 *val)
{
    struct mac80211_hwsim_data *data = dat;
    *val = data->ps;
    return 0;
}

static int hwsim_fops_ps_write(void *dat, u64 val)
{
    struct mac80211_hwsim_data *data = dat;
    enum ps_mode old_ps;

    if (val != PS_DISABLED && val != PS_ENABLED && val != PS_AUTO_POLL &&
        val != PS_MANUAL_POLL)
        return -EINVAL;

    old_ps = data->ps;
    data->ps = val;

    if (val == PS_MANUAL_POLL) {
        ieee80211_iterate_active_interfaces(data->hw,
                            hwsim_send_ps_poll, data);
        data->ps_poll_pending = true;
    } else if (old_ps == PS_DISABLED && val != PS_DISABLED) {
        ieee80211_iterate_active_interfaces(data->hw,
                            hwsim_send_nullfunc_ps,
                            data);
    } else if (old_ps != PS_DISABLED && val == PS_DISABLED) {
        ieee80211_iterate_active_interfaces(data->hw,
                            hwsim_send_nullfunc_no_ps,
                            data);
    }

    return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(hwsim_fops_ps, hwsim_fops_ps_read, hwsim_fops_ps_write,
            "%llu\n");


static int hwsim_fops_group_read(void *dat, u64 *val)
{
    struct mac80211_hwsim_data *data = dat;
    *val = data->group;
    return 0;
}

static int hwsim_fops_group_write(void *dat, u64 val)
{
    struct mac80211_hwsim_data *data = dat;
    data->group = val;
    return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(hwsim_fops_group,
            hwsim_fops_group_read, hwsim_fops_group_write,
            "%llx\n");

static struct mac80211_hwsim_data *get_hwsim_data_ref_from_addr(
                 struct mac_address *addr)
{
    struct mac80211_hwsim_data *data;
    bool _found = false;

    spin_lock_bh(&hwsim_radio_lock);
    list_for_each_entry(data, &hwsim_radios, list) {
        if (memcmp(data->addresses[1].addr, addr,
              sizeof(struct mac_address)) == 0) {
            _found = true;
            break;
        }
    }
    spin_unlock_bh(&hwsim_radio_lock);

    if (!_found)
        return NULL;

    return data;
}

static int hwsim_tx_info_frame_received_nl(struct sk_buff *skb_2,
                       struct genl_info *info)
{

    struct ieee80211_hdr *hdr;
    struct mac80211_hwsim_data *data2;
    struct ieee80211_tx_info *txi;
    struct hwsim_tx_rate *tx_attempts;
    unsigned long ret_skb_ptr;
    struct sk_buff *skb, *tmp;
    struct mac_address *src;
    unsigned int hwsim_flags;

    int i;
    bool found = false;

    if (!info->attrs[HWSIM_ATTR_ADDR_TRANSMITTER] ||
       !info->attrs[HWSIM_ATTR_FLAGS] ||
       !info->attrs[HWSIM_ATTR_COOKIE] ||
       !info->attrs[HWSIM_ATTR_TX_INFO])
        goto out;

    src = (struct mac_address *)nla_data(
                   info->attrs[HWSIM_ATTR_ADDR_TRANSMITTER]);
    hwsim_flags = nla_get_u32(info->attrs[HWSIM_ATTR_FLAGS]);

    ret_skb_ptr = nla_get_u64(info->attrs[HWSIM_ATTR_COOKIE]);

    data2 = get_hwsim_data_ref_from_addr(src);

    if (data2 == NULL)
        goto out;

    /* look for the skb matching the cookie passed back from user */
    skb_queue_walk_safe(&data2->pending, skb, tmp) {
        if ((unsigned long)skb == ret_skb_ptr) {
            skb_unlink(skb, &data2->pending);
            found = true;
            break;
        }
    }

    /* not found */
    if (!found)
        goto out;

    /* Tx info received because the frame was broadcasted on user space,
     so we get all the necessary info: tx attempts and skb control buff */

    tx_attempts = (struct hwsim_tx_rate *)nla_data(
               info->attrs[HWSIM_ATTR_TX_INFO]);

    /* now send back TX status */
    txi = IEEE80211_SKB_CB(skb);

    ieee80211_tx_info_clear_status(txi);

    for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
        txi->status.rates[i].idx = tx_attempts[i].idx;
        txi->status.rates[i].count = tx_attempts[i].count;
        /*txi->status.rates[i].flags = 0;*/
    }

    txi->status.ack_signal = nla_get_u32(info->attrs[HWSIM_ATTR_SIGNAL]);

    if (!(hwsim_flags & HWSIM_TX_CTL_NO_ACK) &&
       (hwsim_flags & HWSIM_TX_STAT_ACK)) {
        if (skb->len >= 16) {
            hdr = (struct ieee80211_hdr *) skb->data;
            mac80211_hwsim_monitor_ack(data2->hw, hdr->addr2);
        }
        txi->flags |= IEEE80211_TX_STAT_ACK;
    }
    ieee80211_tx_status_irqsafe(data2->hw, skb);
    return 0;
out:
    return -EINVAL;

}

static int hwsim_cloned_frame_received_nl(struct sk_buff *skb_2,
                      struct genl_info *info)
{

    struct mac80211_hwsim_data  *data2;
    struct ieee80211_rx_status rx_status;
    struct mac_address *dst;
    int frame_data_len;
    char *frame_data;
    struct sk_buff *skb = NULL;

    if (!info->attrs[HWSIM_ATTR_ADDR_RECEIVER] ||
       !info->attrs[HWSIM_ATTR_FRAME] ||
       !info->attrs[HWSIM_ATTR_RX_RATE] ||
       !info->attrs[HWSIM_ATTR_SIGNAL])
        goto out;

    dst = (struct mac_address *)nla_data(
                   info->attrs[HWSIM_ATTR_ADDR_RECEIVER]);

    frame_data_len = nla_len(info->attrs[HWSIM_ATTR_FRAME]);
    frame_data = (char *)nla_data(info->attrs[HWSIM_ATTR_FRAME]);

    /* Allocate new skb here */
    skb = alloc_skb(frame_data_len, GFP_KERNEL);
    if (skb == NULL)
        goto err;

    if (frame_data_len <= IEEE80211_MAX_DATA_LEN) {
        /* Copy the data */
        memcpy(skb_put(skb, frame_data_len), frame_data,
               frame_data_len);
    } else
        goto err;

    data2 = get_hwsim_data_ref_from_addr(dst);

    if (data2 == NULL)
        goto out;

    /* check if radio is configured properly */

    if (data2->idle || !data2->started || !data2->channel)
        goto out;

    /*A frame is received from user space*/
    memset(&rx_status, 0, sizeof(rx_status));
    rx_status.freq = data2->channel->center_freq;
    rx_status.band = data2->channel->band;
    rx_status.rate_idx = nla_get_u32(info->attrs[HWSIM_ATTR_RX_RATE]);
    rx_status.signal = nla_get_u32(info->attrs[HWSIM_ATTR_SIGNAL]);

    memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
    ieee80211_rx_irqsafe(data2->hw, skb);

    return 0;
err:
    printk(KERN_DEBUG "mac80211_hwsim: error occurred in %s\n", __func__);
    goto out;
out:
    dev_kfree_skb(skb);
    return -EINVAL;
}

static int hwsim_register_received_nl(struct sk_buff *skb_2,
                      struct genl_info *info)
{
    if (info == NULL)
        goto out;

    wmediumd_portid = info->snd_portid;

    printk(KERN_DEBUG "mac80211_hwsim: received a REGISTER, "
           "switching to wmediumd mode with pid %d\n", info->snd_portid);

    return 0;
out:
    printk(KERN_DEBUG "mac80211_hwsim: error occurred in %s\n", __func__);
    return -EINVAL;
}

/* Generic Netlink operations array */
static struct genl_ops hwsim_ops[] = {
    {
        .cmd = HWSIM_CMD_REGISTER,
        .policy = hwsim_genl_policy,
        .doit = hwsim_register_received_nl,
        .flags = GENL_ADMIN_PERM,
    },
    {
        .cmd = HWSIM_CMD_FRAME,
        .policy = hwsim_genl_policy,
        .doit = hwsim_cloned_frame_received_nl,
    },
    {
        .cmd = HWSIM_CMD_TX_INFO_FRAME,
        .policy = hwsim_genl_policy,
        .doit = hwsim_tx_info_frame_received_nl,
    },
};

static int mac80211_hwsim_netlink_notify(struct notifier_block *nb,
                     unsigned long state,
                     void *_notify)
{
    struct netlink_notify *notify = _notify;

    if (state != NETLINK_URELEASE)
        return NOTIFY_DONE;

    if (notify->portid == wmediumd_portid) {
        printk(KERN_INFO "mac80211_hwsim: wmediumd released netlink"
               " socket, switching to perfect channel medium\n");
        wmediumd_portid = 0;
    }
    return NOTIFY_DONE;

}

static struct notifier_block hwsim_netlink_notifier = {
    .notifier_call = mac80211_hwsim_netlink_notify,
};

static int hwsim_init_netlink(void)
{
    int rc;
    printk(KERN_INFO "mac80211_hwsim: initializing netlink\n");

    rc = genl_register_family_with_ops(&hwsim_genl_family,
        hwsim_ops, ARRAY_SIZE(hwsim_ops));
    if (rc)
        goto failure;

    rc = netlink_register_notifier(&hwsim_netlink_notifier);
    if (rc)
        goto failure;

    return 0;

failure:
    printk(KERN_DEBUG "mac80211_hwsim: error occurred in %s\n", __func__);
    return -EINVAL;
}

static void hwsim_exit_netlink(void)
{
    int ret;

    printk(KERN_INFO "mac80211_hwsim: closing netlink\n");
    /* unregister the notifier */
    netlink_unregister_notifier(&hwsim_netlink_notifier);
    /* unregister the family */
    ret = genl_unregister_family(&hwsim_genl_family);
    if (ret)
        printk(KERN_DEBUG "mac80211_hwsim: "
               "unregister family %i\n", ret);
}

static const struct ieee80211_iface_limit hwsim_if_limits[] = {
    { .max = 1, .types = BIT(NL80211_IFTYPE_ADHOC) },
    { .max = 2048,  .types = BIT(NL80211_IFTYPE_STATION) |
                 BIT(NL80211_IFTYPE_P2P_CLIENT) |
#ifdef CONFIG_MAC80211_MESH
                 BIT(NL80211_IFTYPE_MESH_POINT) |
#endif
                 BIT(NL80211_IFTYPE_AP) |
                 BIT(NL80211_IFTYPE_P2P_GO) },
    { .max = 1, .types = BIT(NL80211_IFTYPE_P2P_DEVICE) },
};

static const struct ieee80211_iface_combination hwsim_if_comb = {
    .limits = hwsim_if_limits,
    .n_limits = ARRAY_SIZE(hwsim_if_limits),
    .max_interfaces = 2048,
    .num_different_channels = 1,
};

static int __init init_mac80211_hwsim(void)
{
    int i, err = 0;
    u8 addr[ETH_ALEN];
    struct mac80211_hwsim_data *data;
    struct ieee80211_hw *hw;
    enum ieee80211_band band;

    if (radios < 1 || radios > 100)
        return -EINVAL;

    if (fake_hw_scan) {
        mac80211_hwsim_ops.hw_scan = mac80211_hwsim_hw_scan;
        mac80211_hwsim_ops.sw_scan_start = NULL;
        mac80211_hwsim_ops.sw_scan_complete = NULL;
    }

    spin_lock_init(&hwsim_radio_lock);
    INIT_LIST_HEAD(&hwsim_radios);

    hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
    if (IS_ERR(hwsim_class))
        return PTR_ERR(hwsim_class);

    memset(addr, 0, ETH_ALEN);
    addr[0] = 0x02;

    for (i = 0; i < radios; i++) {
        printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
               i);
        hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
        if (!hw) {
            printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
                   "failed\n");
            err = -ENOMEM;
            goto failed;
        }
        data = hw->priv;
        data->hw = hw;

        data->dev = device_create(hwsim_class, NULL, 0, hw,
                      "hwsim%d", i);
        if (IS_ERR(data->dev)) {
            printk(KERN_DEBUG
                   "mac80211_hwsim: device_create "
                   "failed (%ld)\n", PTR_ERR(data->dev));
            err = -ENOMEM;
            goto failed_drvdata;
        }
        data->dev->driver = &mac80211_hwsim_driver;
        skb_queue_head_init(&data->pending);

        SET_IEEE80211_DEV(hw, data->dev);
        addr[3] = i >> 8;
        addr[4] = i;
        memcpy(data->addresses[0].addr, addr, ETH_ALEN);
        memcpy(data->addresses[1].addr, addr, ETH_ALEN);
        data->addresses[1].addr[0] |= 0x40;
        hw->wiphy->n_addresses = 2;
        hw->wiphy->addresses = data->addresses;

        hw->wiphy->iface_combinations = &hwsim_if_comb;
        hw->wiphy->n_iface_combinations = 1;

        if (fake_hw_scan) {
            hw->wiphy->max_scan_ssids = 255;
            hw->wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
        }

        hw->channel_change_time = 1;
        hw->queues = 4;
        hw->wiphy->interface_modes =
            BIT(NL80211_IFTYPE_STATION) |
            BIT(NL80211_IFTYPE_AP) |
            BIT(NL80211_IFTYPE_P2P_CLIENT) |
            BIT(NL80211_IFTYPE_P2P_GO) |
            BIT(NL80211_IFTYPE_ADHOC) |
            BIT(NL80211_IFTYPE_MESH_POINT) |
            BIT(NL80211_IFTYPE_P2P_DEVICE);

        hw->flags = IEEE80211_HW_MFP_CAPABLE |
                IEEE80211_HW_SIGNAL_DBM |
                IEEE80211_HW_SUPPORTS_STATIC_SMPS |
                IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS |
                IEEE80211_HW_AMPDU_AGGREGATION |
                IEEE80211_HW_WANT_MONITOR_VIF;

        hw->wiphy->flags |= WIPHY_FLAG_SUPPORTS_TDLS |
                    WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;

        /* ask mac80211 to reserve space for magic */
        hw->vif_data_size = sizeof(struct hwsim_vif_priv);
        hw->sta_data_size = sizeof(struct hwsim_sta_priv);

        memcpy(data->channels_2ghz, hwsim_channels_2ghz,
            sizeof(hwsim_channels_2ghz));
        memcpy(data->channels_5ghz, hwsim_channels_5ghz,
            sizeof(hwsim_channels_5ghz));
        memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));

        for (band = IEEE80211_BAND_2GHZ; band < IEEE80211_NUM_BANDS; band++) {
            struct ieee80211_supported_band *sband = &data->bands[band];
            switch (band) {
            case IEEE80211_BAND_2GHZ:
                sband->channels = data->channels_2ghz;
                sband->n_channels =
                    ARRAY_SIZE(hwsim_channels_2ghz);
                sband->bitrates = data->rates;
                sband->n_bitrates = ARRAY_SIZE(hwsim_rates);
                break;
            case IEEE80211_BAND_5GHZ:
                sband->channels = data->channels_5ghz;
                sband->n_channels =
                    ARRAY_SIZE(hwsim_channels_5ghz);
                sband->bitrates = data->rates + 4;
                sband->n_bitrates = ARRAY_SIZE(hwsim_rates) - 4;
                break;
            default:
                continue;
            }

            sband->ht_cap.ht_supported = true;
            sband->ht_cap.cap = IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
                IEEE80211_HT_CAP_GRN_FLD |
                IEEE80211_HT_CAP_SGI_40 |
                IEEE80211_HT_CAP_DSSSCCK40;
            sband->ht_cap.ampdu_factor = 0x3;
            sband->ht_cap.ampdu_density = 0x6;
            memset(&sband->ht_cap.mcs, 0,
                   sizeof(sband->ht_cap.mcs));
            sband->ht_cap.mcs.rx_mask[0] = 0xff;
            sband->ht_cap.mcs.rx_mask[1] = 0xff;
            sband->ht_cap.mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;

            hw->wiphy->bands[band] = sband;
        }
        /* By default all radios are belonging to the first group */
        data->group = 1;
        mutex_init(&data->mutex);

        /* Enable frame retransmissions for lossy channels */
        hw->max_rates = 4;
        hw->max_rate_tries = 11;

        /* Work to be done prior to ieee80211_register_hw() */
        switch (regtest) {
        case HWSIM_REGTEST_DISABLED:
        case HWSIM_REGTEST_DRIVER_REG_FOLLOW:
        case HWSIM_REGTEST_DRIVER_REG_ALL:
        case HWSIM_REGTEST_DIFF_COUNTRY:
            /*
             * Nothing to be done for driver regulatory domain
             * hints prior to ieee80211_register_hw()
             */
            break;
        case HWSIM_REGTEST_WORLD_ROAM:
            if (i == 0) {
                hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
                wiphy_apply_custom_regulatory(hw->wiphy,
                    &hwsim_world_regdom_custom_01);
            }
            break;
        case HWSIM_REGTEST_CUSTOM_WORLD:
            hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
            wiphy_apply_custom_regulatory(hw->wiphy,
                &hwsim_world_regdom_custom_01);
            break;
        case HWSIM_REGTEST_CUSTOM_WORLD_2:
            if (i == 0) {
                hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
                wiphy_apply_custom_regulatory(hw->wiphy,
                    &hwsim_world_regdom_custom_01);
            } else if (i == 1) {
                hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
                wiphy_apply_custom_regulatory(hw->wiphy,
                    &hwsim_world_regdom_custom_02);
            }
            break;
        case HWSIM_REGTEST_STRICT_ALL:
            hw->wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
            break;
        case HWSIM_REGTEST_STRICT_FOLLOW:
        case HWSIM_REGTEST_STRICT_AND_DRIVER_REG:
            if (i == 0)
                hw->wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
            break;
        case HWSIM_REGTEST_ALL:
            if (i == 0) {
                hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
                wiphy_apply_custom_regulatory(hw->wiphy,
                    &hwsim_world_regdom_custom_01);
            } else if (i == 1) {
                hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
                wiphy_apply_custom_regulatory(hw->wiphy,
                    &hwsim_world_regdom_custom_02);
            } else if (i == 4)
                hw->wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
            break;
        default:
            break;
        }

        /* give the regulatory workqueue a chance to run */
        if (regtest)
            schedule_timeout_interruptible(1);
        err = ieee80211_register_hw(hw);
        if (err < 0) {
            printk(KERN_DEBUG "mac80211_hwsim: "
                   "ieee80211_register_hw failed (%d)\n", err);
            goto failed_hw;
        }

        /* Work to be done after to ieee80211_register_hw() */
        switch (regtest) {
        case HWSIM_REGTEST_WORLD_ROAM:
        case HWSIM_REGTEST_DISABLED:
            break;
        case HWSIM_REGTEST_DRIVER_REG_FOLLOW:
            if (!i)
                regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
            break;
        case HWSIM_REGTEST_DRIVER_REG_ALL:
        case HWSIM_REGTEST_STRICT_ALL:
            regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
            break;
        case HWSIM_REGTEST_DIFF_COUNTRY:
            if (i < ARRAY_SIZE(hwsim_alpha2s))
                regulatory_hint(hw->wiphy, hwsim_alpha2s[i]);
            break;
        case HWSIM_REGTEST_CUSTOM_WORLD:
        case HWSIM_REGTEST_CUSTOM_WORLD_2:
            /*
             * Nothing to be done for custom world regulatory
             * domains after to ieee80211_register_hw
             */
            break;
        case HWSIM_REGTEST_STRICT_FOLLOW:
            if (i == 0)
                regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
            break;
        case HWSIM_REGTEST_STRICT_AND_DRIVER_REG:
            if (i == 0)
                regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
            else if (i == 1)
                regulatory_hint(hw->wiphy, hwsim_alpha2s[1]);
            break;
        case HWSIM_REGTEST_ALL:
            if (i == 2)
                regulatory_hint(hw->wiphy, hwsim_alpha2s[0]);
            else if (i == 3)
                regulatory_hint(hw->wiphy, hwsim_alpha2s[1]);
            else if (i == 4)
                regulatory_hint(hw->wiphy, hwsim_alpha2s[2]);
            break;
        default:
            break;
        }

        wiphy_debug(hw->wiphy, "hwaddr %pm registered\n",
                hw->wiphy->perm_addr);

        data->debugfs = debugfs_create_dir("hwsim",
                           hw->wiphy->debugfsdir);
        data->debugfs_ps = debugfs_create_file("ps", 0666,
                               data->debugfs, data,
                               &hwsim_fops_ps);
        data->debugfs_group = debugfs_create_file("group", 0666,
                            data->debugfs, data,
                            &hwsim_fops_group);

        setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
                (unsigned long) hw);

        list_add_tail(&data->list, &hwsim_radios);
    }

    hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
    if (hwsim_mon == NULL)
        goto failed;

    rtnl_lock();

    err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
    if (err < 0)
        goto failed_mon;


    err = register_netdevice(hwsim_mon);
    if (err < 0)
        goto failed_mon;

    rtnl_unlock();

    err = hwsim_init_netlink();
    if (err < 0)
        goto failed_nl;

    return 0;

failed_nl:
    printk(KERN_DEBUG "mac_80211_hwsim: failed initializing netlink\n");
    return err;

failed_mon:
    rtnl_unlock();
    free_netdev(hwsim_mon);
    mac80211_hwsim_free();
    return err;

failed_hw:
    device_unregister(data->dev);
failed_drvdata:
    ieee80211_free_hw(hw);
failed:
    mac80211_hwsim_free();
    return err;
}
module_init(init_mac80211_hwsim);

static void __exit exit_mac80211_hwsim(void)
{
    printk(KERN_DEBUG "mac80211_hwsim: unregister radios\n");

    hwsim_exit_netlink();

    mac80211_hwsim_free();
    unregister_netdev(hwsim_mon);
}
module_exit(exit_mac80211_hwsim);