/*
 * mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
 * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
 * Copyright (c) 2011, Javier Lopez <jlopex@gmail.com>
 *
 * 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/platform_device.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 int channels = 1;
module_param(channels, int, 0444);
MODULE_PARM_DESC(channels, "Number of concurrent channels");

static bool paged_rx = false;
module_param(paged_rx, bool, 0644);
MODULE_PARM_DESC(paged_rx, "Use paged SKBs for RX instead of linear ones");

static bool rctbl = false;
module_param(rctbl, bool, 0444);
MODULE_PARM_DESC(rctbl, "Handle rate control table");

/**
 * enum hwsim_regtest - the type of regulatory tests we offer
 *
 * These are the different values you can use for the regtest
 * module parameter. This is useful to help test world roaming
 * and the driver regulatory_hint() call and combinations of these.
 * If you want to do specific alpha2 regulatory domain tests simply
 * use the userspace regulatory request as that will be respected as
 * well without the need of this module parameter. This is designed
 * only for testing the driver regulatory request, world roaming
 * and all possible combinations.
 *
 * @HWSIM_REGTEST_DISABLED: No regulatory tests are performed,
 *      this is the default value.
 * @HWSIM_REGTEST_DRIVER_REG_FOLLOW: Used for testing the driver regulatory
 *      hint, only one driver regulatory hint will be sent as such the
 *      secondary radios are expected to follow.
 * @HWSIM_REGTEST_DRIVER_REG_ALL: Used for testing the driver regulatory
 *      request with all radios reporting the same regulatory domain.
 * @HWSIM_REGTEST_DIFF_COUNTRY: Used for testing the drivers calling
 *      different regulatory domains requests. Expected behaviour is for
 *      an intersection to occur but each device will still use their
 *      respective regulatory requested domains. Subsequent radios will
 *      use the resulting intersection.
 * @HWSIM_REGTEST_WORLD_ROAM: Used for testing the world roaming. We accomplish
 *      this by using a custom beacon-capable regulatory domain for the first
 *      radio. All other device world roam.
 * @HWSIM_REGTEST_CUSTOM_WORLD: Used for testing the custom world regulatory
 *      domain requests. All radios will adhere to this custom world regulatory
 *      domain.
 * @HWSIM_REGTEST_CUSTOM_WORLD_2: Used for testing 2 custom world regulatory
 *      domain requests. The first radio will adhere to the first custom world
 *      regulatory domain, the second one to the second custom world regulatory
 *      domain. All other devices will world roam.
 * @HWSIM_REGTEST_STRICT_FOLLOW_: Used for testing strict regulatory domain
 *      settings, only the first radio will send a regulatory domain request
 *      and use strict settings. The rest of the radios are expected to follow.
 * @HWSIM_REGTEST_STRICT_ALL: Used for testing strict regulatory domain
 *      settings. All radios will adhere to this.
 * @HWSIM_REGTEST_STRICT_AND_DRIVER_REG: Used for testing strict regulatory
 *      domain settings, combined with secondary driver regulatory domain
 *      settings. The first radio will get a strict regulatory domain setting
 *      using the first driver regulatory request and the second radio will use
 *      non-strict settings using the second driver regulatory request. All
 *      other devices should follow the intersection created between the
 *      first two.
 * @HWSIM_REGTEST_ALL: Used for testing every possible mix. You will need
 *      at least 6 radios for a complete test. We will test in this order:
 *      1 - driver custom world regulatory domain
 *      2 - second custom world regulatory domain
 *      3 - first driver regulatory domain request
 *      4 - second driver regulatory domain request
 *      5 - strict regulatory domain settings using the third driver regulatory
 *          domain request
 *      6 and on - should follow the intersection of the 3rd, 4rth and 5th radio
 *                 regulatory requests.
 */
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(vp->magic != HWSIM_VIF_MAGIC,
             "Invalid VIF (%p) magic %#x, %pM, %d/%d\n",
             vif, vp->magic, vif->addr, vif->type, vif->p2p);
}

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 0x6d537749

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;
}

struct hwsim_chanctx_priv {
        u32 magic;
};

#define HWSIM_CHANCTX_MAGIC 0x6d53774a

static inline void hwsim_check_chanctx_magic(struct ieee80211_chanctx_conf *c)
{
        struct hwsim_chanctx_priv *cp = (void *)c->drv_priv;
        WARN_ON(cp->magic != HWSIM_CHANCTX_MAGIC);
}

static inline void hwsim_set_chanctx_magic(struct ieee80211_chanctx_conf *c)
{
        struct hwsim_chanctx_priv *cp = (void *)c->drv_priv;
        cp->magic = HWSIM_CHANCTX_MAGIC;
}

static inline void hwsim_clear_chanctx_magic(struct ieee80211_chanctx_conf *c)
{
        struct hwsim_chanctx_priv *cp = (void *)c->drv_priv;
        cp->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 *tmp_chan;
        struct delayed_work roc_done;
        struct delayed_work hw_scan;
        struct cfg80211_scan_request *hw_scan_request;
        struct ieee80211_vif *hw_scan_vif;
        int scan_chan_idx;

        struct ieee80211_channel *channel;
        u64 beacon_int  /* beacon interval in us */;
        unsigned int rx_filter;
        bool started, idle, scanning;
        struct mutex mutex;
        struct tasklet_hrtimer 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 */
        s64 tsf_offset;
        s64 bcn_delta;
        /* absolute beacon transmission time. Used to cover up "tx" delay. */
        u64 abs_bcn_ts;
};


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 inline u64 mac80211_hwsim_get_tsf_raw(void)
{
        return ktime_to_us(ktime_get_real());
}

static __le64 __mac80211_hwsim_get_tsf(struct mac80211_hwsim_data *data)
{
        u64 now = mac80211_hwsim_get_tsf_raw();
        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;
        u64 now = mac80211_hwsim_get_tsf(hw, vif);
        u32 bcn_int = data->beacon_int;
        s64 delta = tsf - now;

        data->tsf_offset += delta;
        /* adjust after beaconing with new timestamp at old TBTT */
        data->bcn_delta = do_div(delta, bcn_int);
}

static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
                                      struct sk_buff *tx_skb,
                                      struct ieee80211_channel *chan)
{
        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(chan->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_channel *chan,
                                       const u8 *addr)
{
        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(chan->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,
                                                   IEEE80211_IFACE_ITER_NORMAL,
                                                   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->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 hwsim_chans_compat(struct ieee80211_channel *c1,
                               struct ieee80211_channel *c2)
{
        if (!c1 || !c2)
                return false;

        return c1->center_freq == c2->center_freq;
}

struct tx_iter_data {
        struct ieee80211_channel *channel;
        bool receive;
};

static void mac80211_hwsim_tx_iter(void *_data, u8 *addr,
                                   struct ieee80211_vif *vif)
{
        struct tx_iter_data *data = _data;

        if (!vif->chanctx_conf)
                return;

        if (!hwsim_chans_compat(data->channel,
                                rcu_dereference(vif->chanctx_conf)->def.chan))
                return;

        data->receive = true;
}

static bool mac80211_hwsim_tx_frame_no_nl(struct ieee80211_hw *hw,
                                          struct sk_buff *skb,
                                          struct ieee80211_channel *chan)
{
        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;
        u64 now;

        memset(&rx_status, 0, sizeof(rx_status));
        rx_status.flag |= RX_FLAG_MACTIME_START;
        rx_status.freq = chan->center_freq;
        rx_status.band = chan->band;
        if (info->control.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
                rx_status.rate_idx =
                        ieee80211_rate_get_vht_mcs(&info->control.rates[0]);
                rx_status.vht_nss =
                        ieee80211_rate_get_vht_nss(&info->control.rates[0]);
                rx_status.flag |= RX_FLAG_VHT;
        } else {
                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);

        /*
         * Get absolute mactime here so all HWs RX at the "same time", and
         * absolute TX time for beacon mactime so the timestamp matches.
         * Giving beacons a different mactime than non-beacons looks messy, but
         * it helps the Toffset be exact and a ~10us mactime discrepancy
         * probably doesn't really matter.
         */
        if (ieee80211_is_beacon(hdr->frame_control) ||
            ieee80211_is_probe_resp(hdr->frame_control))
                now = data->abs_bcn_ts;
        else
                now = mac80211_hwsim_get_tsf_raw();

        /* 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 tx_iter_data tx_iter_data = {
                        .receive = false,
                        .channel = chan,
                };

                if (data == data2)
                        continue;

                if (!data2->started || (data2->idle && !data2->tmp_chan) ||
                    !hwsim_ps_rx_ok(data2, skb))
                        continue;

                if (!(data->group & data2->group))
                        continue;

                if (!hwsim_chans_compat(chan, data2->tmp_chan) &&
                    !hwsim_chans_compat(chan, data2->channel)) {
                        ieee80211_iterate_active_interfaces_atomic(
                                data2->hw, IEEE80211_IFACE_ITER_NORMAL,
                                mac80211_hwsim_tx_iter, &tx_iter_data);
                        if (!tx_iter_data.receive)
                                continue;
                }

                /*
                 * reserve some space for our vendor and the normal
                 * radiotap header, since we're copying anyway
                 */
                if (skb->len < PAGE_SIZE && paged_rx) {
                        struct page *page = alloc_page(GFP_ATOMIC);

                        if (!page)
                                continue;

                        nskb = dev_alloc_skb(128);
                        if (!nskb) {
                                __free_page(page);
                                continue;
                        }

                        memcpy(page_address(page), skb->data, skb->len);
                        skb_add_rx_frag(nskb, 0, page, 0, skb->len, skb->len);
                } else {
                        nskb = skb_copy(skb, GFP_ATOMIC);
                        if (!nskb)
                                continue;
                }

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

                rx_status.mactime = now + data2->tsf_offset;
#if 0
                /*
                 * Don't enable this code by default as the OUI 00:00:00
                 * is registered to Xerox so we shouldn't use it here, it
                 * might find its way into pcap files.
                 * Note that this code requires the headroom in the SKB
                 * that was allocated earlier.
                 */
                rx_status.vendor_radiotap_oui[0] = 0x00;
                rx_status.vendor_radiotap_oui[1] = 0x00;
                rx_status.vendor_radiotap_oui[2] = 0x00;
                rx_status.vendor_radiotap_subns = 127;
                /*
                 * Radiotap vendor namespaces can (and should) also be
                 * split into fields by using the standard radiotap
                 * presence bitmap mechanism. Use just BIT(0) here for
                 * the presence bitmap.
                 */
                rx_status.vendor_radiotap_bitmap = BIT(0);
                /* We have 8 bytes of (dummy) data */
                rx_status.vendor_radiotap_len = 8;
                /* For testing, also require it to be aligned */
                rx_status.vendor_radiotap_align = 8;
                /* push the data */
                memcpy(skb_push(nskb, 8), "ABCDEFGH", 8);
#endif

                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)
{
        struct mac80211_hwsim_data *data = hw->priv;
        struct ieee80211_tx_info *txi = IEEE80211_SKB_CB(skb);
        struct ieee80211_chanctx_conf *chanctx_conf;
        struct ieee80211_channel *channel;
        bool ack;
        u32 _portid;

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

        if (channels == 1) {
                channel = data->channel;
        } else if (txi->hw_queue == 4) {
                channel = data->tmp_chan;
        } else {
                chanctx_conf = rcu_dereference(txi->control.vif->chanctx_conf);
                if (chanctx_conf)
                        channel = chanctx_conf->def.chan;
                else
                        channel = NULL;
        }

        if (WARN(!channel, "TX w/o channel - queue = %d\n", txi->hw_queue)) {
                dev_kfree_skb(skb);
                return;
        }

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

        if (txi->control.vif)
                hwsim_check_magic(txi->control.vif);
        if (control->sta)
                hwsim_check_sta_magic(control->sta);

        if (rctbl)
                ieee80211_get_tx_rates(txi->control.vif, control->sta, skb,
                                       txi->control.rates,
                                       ARRAY_SIZE(txi->control.rates));

        txi->rate_driver_data[0] = channel;
        mac80211_hwsim_monitor_rx(hw, skb, channel);

        /* 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, channel);

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

        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;
        tasklet_hrtimer_cancel(&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);

        vif->cab_queue = 0;
        vif->hw_queue[IEEE80211_AC_VO] = 0;
        vif->hw_queue[IEEE80211_AC_VI] = 1;
        vif->hw_queue[IEEE80211_AC_BE] = 2;
        vif->hw_queue[IEEE80211_AC_BK] = 3;

        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);

        /*
         * interface may change from non-AP to AP in
         * which case this needs to be set up again
         */
        vif->cab_queue = 0;

        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_tx_frame(struct ieee80211_hw *hw,
                                    struct sk_buff *skb,
                                    struct ieee80211_channel *chan)
{
        u32 _pid = ACCESS_ONCE(wmediumd_portid);

        if (rctbl) {
                struct ieee80211_tx_info *txi = IEEE80211_SKB_CB(skb);
                ieee80211_get_tx_rates(txi->control.vif, NULL, skb,
                                       txi->control.rates,
                                       ARRAY_SIZE(txi->control.rates));
        }

        mac80211_hwsim_monitor_rx(hw, skb, chan);

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

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

static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
                                     struct ieee80211_vif *vif)
{
        struct mac80211_hwsim_data *data = arg;
        struct ieee80211_hw *hw = data->hw;
        struct ieee80211_tx_info *info;
        struct ieee80211_rate *txrate;
        struct ieee80211_mgmt *mgmt;
        struct sk_buff *skb;

        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);
        if (rctbl)
                ieee80211_get_tx_rates(vif, NULL, skb,
                                       info->control.rates,
                                       ARRAY_SIZE(info->control.rates));

        txrate = ieee80211_get_tx_rate(hw, info);

        mgmt = (struct ieee80211_mgmt *) skb->data;
        /* fake header transmission time */
        data->abs_bcn_ts = mac80211_hwsim_get_tsf_raw();
        mgmt->u.beacon.timestamp = cpu_to_le64(data->abs_bcn_ts +
                                               data->tsf_offset +
                                               24 * 8 * 10 / txrate->bitrate);

        mac80211_hwsim_tx_frame(hw, skb,
                                rcu_dereference(vif->chanctx_conf)->def.chan);
}

static enum hrtimer_restart
mac80211_hwsim_beacon(struct hrtimer *timer)
{
        struct mac80211_hwsim_data *data =
                container_of(timer, struct mac80211_hwsim_data,
                             beacon_timer.timer);
        struct ieee80211_hw *hw = data->hw;
        u64 bcn_int = data->beacon_int;
        ktime_t next_bcn;

        if (!data->started)
                goto out;

        ieee80211_iterate_active_interfaces_atomic(
                hw, IEEE80211_IFACE_ITER_NORMAL,
                mac80211_hwsim_beacon_tx, data);

        /* beacon at new TBTT + beacon interval */
        if (data->bcn_delta) {
                bcn_int -= data->bcn_delta;
                data->bcn_delta = 0;
        }

        next_bcn = ktime_add(hrtimer_get_expires(timer),
                             ns_to_ktime(bcn_int * 1000));
        tasklet_hrtimer_start(&data->beacon_timer, next_bcn, HRTIMER_MODE_ABS);
out:
        return HRTIMER_NORESTART;
}

static const char * const hwsim_chanwidths[] = {
        [NL80211_CHAN_WIDTH_20_NOHT] = "noht",
        [NL80211_CHAN_WIDTH_20] = "ht20",
        [NL80211_CHAN_WIDTH_40] = "ht40",
        [NL80211_CHAN_WIDTH_80] = "vht80",
        [NL80211_CHAN_WIDTH_80P80] = "vht80p80",
        [NL80211_CHAN_WIDTH_160] = "vht160",
};

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",
        };

        if (conf->chandef.chan)
                wiphy_debug(hw->wiphy,
                            "%s (freq=%d(%d - %d)/%s idle=%d ps=%d smps=%s)\n",
                            __func__,
                            conf->chandef.chan->center_freq,
                            conf->chandef.center_freq1,
                            conf->chandef.center_freq2,
                            hwsim_chanwidths[conf->chandef.width],
                            !!(conf->flags & IEEE80211_CONF_IDLE),
                            !!(conf->flags & IEEE80211_CONF_PS),
                            smps_modes[conf->smps_mode]);
        else
                wiphy_debug(hw->wiphy,
                            "%s (freq=0 idle=%d ps=%d smps=%s)\n",
                            __func__,
                            !!(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->chandef.chan;

        WARN_ON(data->channel && channels > 1);

        data->power_level = conf->power_level;
        if (!data->started || !data->beacon_int)
                tasklet_hrtimer_cancel(&data->beacon_timer);
        else if (!hrtimer_is_queued(&data->beacon_timer.timer)) {
                u64 tsf = mac80211_hwsim_get_tsf(hw, NULL);
                u32 bcn_int = data->beacon_int;
                u64 until_tbtt = bcn_int - do_div(tsf, bcn_int);

                tasklet_hrtimer_start(&data->beacon_timer,
                                      ns_to_ktime(until_tbtt * 1000),
                                      HRTIMER_MODE_REL);
        }

        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 = info->beacon_int * 1024;
        }

        if (changed & BSS_CHANGED_BEACON_ENABLED) {
                wiphy_debug(hw->wiphy, "  BCN EN: %d\n", info->enable_beacon);
                if (data->started &&
                    !hrtimer_is_queued(&data->beacon_timer.timer) &&
                    info->enable_beacon) {
                        u64 tsf, until_tbtt;
                        u32 bcn_int;
                        if (WARN_ON(!data->beacon_int))
                                data->beacon_int = 1000 * 1024;
                        tsf = mac80211_hwsim_get_tsf(hw, vif);
                        bcn_int = data->beacon_int;
                        until_tbtt = bcn_int - do_div(tsf, bcn_int);
                        tasklet_hrtimer_start(&data->beacon_timer,
                                              ns_to_ktime(until_tbtt * 1000),
                                              HRTIMER_MODE_REL);
                } else if (!info->enable_beacon)
                        tasklet_hrtimer_cancel(&data->beacon_timer);
        }

        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\n",
                            info->ht_operation_mode);
        }

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

        if (changed & BSS_CHANGED_TXPOWER)
                wiphy_debug(hw->wiphy, "  TX Power: %d dBm\n", info->txpower);
}

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->chandef.chan;

        /*
         * 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_CONT:
        case IEEE80211_AMPDU_TX_STOP_FLUSH:
        case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
                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, u32 queues, bool drop)
{
        /* Not implemented, queues only on kernel side */
}

static void hw_scan_work(struct work_struct *work)
{
        struct mac80211_hwsim_data *hwsim =
                container_of(work, struct mac80211_hwsim_data, hw_scan.work);
        struct cfg80211_scan_request *req = hwsim->hw_scan_request;
        int dwell, i;

        mutex_lock(&hwsim->mutex);
        if (hwsim->scan_chan_idx >= req->n_channels) {
                wiphy_debug(hwsim->hw->wiphy, "hw scan complete\n");
                ieee80211_scan_completed(hwsim->hw, false);
                hwsim->hw_scan_request = NULL;
                hwsim->hw_scan_vif = NULL;
                hwsim->tmp_chan = NULL;
                mutex_unlock(&hwsim->mutex);
                return;
        }

        wiphy_debug(hwsim->hw->wiphy, "hw scan %d MHz\n",
                    req->channels[hwsim->scan_chan_idx]->center_freq);

        hwsim->tmp_chan = req->channels[hwsim->scan_chan_idx];
        if (hwsim->tmp_chan->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
            !req->n_ssids) {
                dwell = 120;
        } else {
                dwell = 30;
                /* send probes */
                for (i = 0; i < req->n_ssids; i++) {
                        struct sk_buff *probe;

                        probe = ieee80211_probereq_get(hwsim->hw,
                                                       hwsim->hw_scan_vif,
                                                       req->ssids[i].ssid,
                                                       req->ssids[i].ssid_len,
                                                       req->ie_len);
                        if (!probe)
                                continue;

                        if (req->ie_len)
                                memcpy(skb_put(probe, req->ie_len), req->ie,
                                       req->ie_len);

                        local_bh_disable();
                        mac80211_hwsim_tx_frame(hwsim->hw, probe,
                                                hwsim->tmp_chan);
                        local_bh_enable();
                }
        }
        ieee80211_queue_delayed_work(hwsim->hw, &hwsim->hw_scan,
                                     msecs_to_jiffies(dwell));
        hwsim->scan_chan_idx++;
        mutex_unlock(&hwsim->mutex);
}

static int mac80211_hwsim_hw_scan(struct ieee80211_hw *hw,
                                  struct ieee80211_vif *vif,
                                  struct cfg80211_scan_request *req)
{
        struct mac80211_hwsim_data *hwsim = hw->priv;

        mutex_lock(&hwsim->mutex);
        if (WARN_ON(hwsim->tmp_chan || hwsim->hw_scan_request)) {
                mutex_unlock(&hwsim->mutex);
                return -EBUSY;
        }
        hwsim->hw_scan_request = req;
        hwsim->hw_scan_vif = vif;
        hwsim->scan_chan_idx = 0;
        mutex_unlock(&hwsim->mutex);

        wiphy_debug(hw->wiphy, "hwsim hw_scan request\n");

        ieee80211_queue_delayed_work(hwsim->hw, &hwsim->hw_scan, 0);

        return 0;
}

static void mac80211_hwsim_cancel_hw_scan(struct ieee80211_hw *hw,
                                          struct ieee80211_vif *vif)
{
        struct mac80211_hwsim_data *hwsim = hw->priv;

        wiphy_debug(hw->wiphy, "hwsim cancel_hw_scan\n");

        cancel_delayed_work_sync(&hwsim->hw_scan);

        mutex_lock(&hwsim->mutex);
        ieee80211_scan_completed(hwsim->hw, true);
        hwsim->tmp_chan = NULL;
        hwsim->hw_scan_request = NULL;
        hwsim->hw_scan_vif = NULL;
        mutex_unlock(&hwsim->mutex);
}

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 void hw_roc_done(struct work_struct *work)
{
        struct mac80211_hwsim_data *hwsim =
                container_of(work, struct mac80211_hwsim_data, roc_done.work);

        mutex_lock(&hwsim->mutex);
        ieee80211_remain_on_channel_expired(hwsim->hw);
        hwsim->tmp_chan = NULL;
        mutex_unlock(&hwsim->mutex);

        wiphy_debug(hwsim->hw->wiphy, "hwsim ROC expired\n");
}

static int mac80211_hwsim_roc(struct ieee80211_hw *hw,
                              struct ieee80211_vif *vif,
                              struct ieee80211_channel *chan,
                              int duration,
                              enum ieee80211_roc_type type)
{
        struct mac80211_hwsim_data *hwsim = hw->priv;

        mutex_lock(&hwsim->mutex);
        if (WARN_ON(hwsim->tmp_chan || hwsim->hw_scan_request)) {
                mutex_unlock(&hwsim->mutex);
                return -EBUSY;
        }

        hwsim->tmp_chan = chan;
        mutex_unlock(&hwsim->mutex);

        wiphy_debug(hw->wiphy, "hwsim ROC (%d MHz, %d ms)\n",
                    chan->center_freq, duration);

        ieee80211_ready_on_channel(hw);

        ieee80211_queue_delayed_work(hw, &hwsim->roc_done,
                                     msecs_to_jiffies(duration));
        return 0;
}

static int mac80211_hwsim_croc(struct ieee80211_hw *hw)
{
        struct mac80211_hwsim_data *hwsim = hw->priv;

        cancel_delayed_work_sync(&hwsim->roc_done);

        mutex_lock(&hwsim->mutex);
        hwsim->tmp_chan = NULL;
        mutex_unlock(&hwsim->mutex);

        wiphy_debug(hw->wiphy, "hwsim ROC canceled\n");

        return 0;
}

static int mac80211_hwsim_add_chanctx(struct ieee80211_hw *hw,
                                      struct ieee80211_chanctx_conf *ctx)
{
        hwsim_set_chanctx_magic(ctx);
        wiphy_debug(hw->wiphy,
                    "add channel context control: %d MHz/width: %d/cfreqs:%d/%d MHz\n",
                    ctx->def.chan->center_freq, ctx->def.width,
                    ctx->def.center_freq1, ctx->def.center_freq2);
        return 0;
}

static void mac80211_hwsim_remove_chanctx(struct ieee80211_hw *hw,
                                          struct ieee80211_chanctx_conf *ctx)
{
        wiphy_debug(hw->wiphy,
                    "remove channel context control: %d MHz/width: %d/cfreqs:%d/%d MHz\n",
                    ctx->def.chan->center_freq, ctx->def.width,
                    ctx->def.center_freq1, ctx->def.center_freq2);
        hwsim_check_chanctx_magic(ctx);
        hwsim_clear_chanctx_magic(ctx);
}

static void mac80211_hwsim_change_chanctx(struct ieee80211_hw *hw,
                                          struct ieee80211_chanctx_conf *ctx,
                                          u32 changed)
{
        hwsim_check_chanctx_magic(ctx);
        wiphy_debug(hw->wiphy,
                    "change channel context control: %d MHz/width: %d/cfreqs:%d/%d MHz\n",
                    ctx->def.chan->center_freq, ctx->def.width,
                    ctx->def.center_freq1, ctx->def.center_freq2);
}

static int mac80211_hwsim_assign_vif_chanctx(struct ieee80211_hw *hw,
                                             struct ieee80211_vif *vif,
                                             struct ieee80211_chanctx_conf *ctx)
{
        hwsim_check_magic(vif);
        hwsim_check_chanctx_magic(ctx);

        return 0;
}

static void mac80211_hwsim_unassign_vif_chanctx(struct ieee80211_hw *hw,
                                                struct ieee80211_vif *vif,
                                                struct ieee80211_chanctx_conf *ctx)
{
        hwsim_check_magic(vif);
        hwsim_check_chanctx_magic(ctx);
}

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_release_driver(data->dev);
                device_unregister(data->dev);
                ieee80211_free_hw(data->hw);
        }
        class_destroy(hwsim_class);
}

static struct platform_driver mac80211_hwsim_driver = {
        .driver = {
                .name = "mac80211_hwsim",
                .owner = THIS_MODULE,
        },
};

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;

        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);

        rcu_read_lock();
        mac80211_hwsim_tx_frame(data->hw, skb,
                                rcu_dereference(vif->chanctx_conf)->def.chan);
        rcu_read_unlock();
}

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;

        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);

        rcu_read_lock();
        mac80211_hwsim_tx_frame(data->hw, skb,
                                rcu_dereference(vif->chanctx_conf)->def.chan);
        rcu_read_unlock();
}


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,
                                                    IEEE80211_IFACE_ITER_NORMAL,
                                                    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,
                                                    IEEE80211_IFACE_ITER_NORMAL,
                                                    hwsim_send_nullfunc_ps,
                                                    data);
        } else if (old_ps != PS_DISABLED && val == PS_DISABLED) {
                ieee80211_iterate_active_interfaces(data->hw,
                                                    IEEE80211_IFACE_ITER_NORMAL,
                                                    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(txi->rate_driver_data[0],
                                                   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)
                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;

        /* userspace test API hasn't been adjusted for multi-channel */
        if (channels > 1)
                return 0;

        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;

        /* userspace test API hasn't been adjusted for multi-channel */
        if (channels > 1)
                return;

        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 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 (channels < 1)
                return -EINVAL;

        if (channels > 1) {
                hwsim_if_comb.num_different_channels = channels;
                mac80211_hwsim_ops.hw_scan = mac80211_hwsim_hw_scan;
                mac80211_hwsim_ops.cancel_hw_scan =
                        mac80211_hwsim_cancel_hw_scan;
                mac80211_hwsim_ops.sw_scan_start = NULL;
                mac80211_hwsim_ops.sw_scan_complete = NULL;
                mac80211_hwsim_ops.remain_on_channel =
                        mac80211_hwsim_roc;
                mac80211_hwsim_ops.cancel_remain_on_channel =
                        mac80211_hwsim_croc;
                mac80211_hwsim_ops.add_chanctx =
                        mac80211_hwsim_add_chanctx;
                mac80211_hwsim_ops.remove_chanctx =
                        mac80211_hwsim_remove_chanctx;
                mac80211_hwsim_ops.change_chanctx =
                        mac80211_hwsim_change_chanctx;
                mac80211_hwsim_ops.assign_vif_chanctx =
                        mac80211_hwsim_assign_vif_chanctx;
                mac80211_hwsim_ops.unassign_vif_chanctx =
                        mac80211_hwsim_unassign_vif_chanctx;
        }

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

        err = platform_driver_register(&mac80211_hwsim_driver);
        if (err)
                return err;

        hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
        if (IS_ERR(hwsim_class)) {
                err = PTR_ERR(hwsim_class);
                goto failed_unregister_driver;
        }

        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.driver;
                err = device_bind_driver(data->dev);
                if (err != 0) {
                        printk(KERN_DEBUG
                               "mac80211_hwsim: device_bind_driver failed (%d)\n",
                               err);
                        goto failed_hw;
                }

                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 (channels > 1) {
                        hw->wiphy->max_scan_ssids = 255;
                        hw->wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
                        hw->wiphy->max_remain_on_channel_duration = 1000;
                }

                INIT_DELAYED_WORK(&data->roc_done, hw_roc_done);
                INIT_DELAYED_WORK(&data->hw_scan, hw_scan_work);

                hw->channel_change_time = 1;
                hw->queues = 5;
                hw->offchannel_tx_hw_queue = 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 |
                            IEEE80211_HW_QUEUE_CONTROL;
                if (rctbl)
                        hw->flags |= IEEE80211_HW_SUPPORTS_RC_TABLE;

                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);
                hw->chanctx_data_size = sizeof(struct hwsim_chanctx_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;

                        sband->vht_cap.vht_supported = true;
                        sband->vht_cap.cap =
                                IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 |
                                IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ |
                                IEEE80211_VHT_CAP_RXLDPC |
                                IEEE80211_VHT_CAP_SHORT_GI_80 |
                                IEEE80211_VHT_CAP_SHORT_GI_160 |
                                IEEE80211_VHT_CAP_TXSTBC |
                                IEEE80211_VHT_CAP_RXSTBC_1 |
                                IEEE80211_VHT_CAP_RXSTBC_2 |
                                IEEE80211_VHT_CAP_RXSTBC_3 |
                                IEEE80211_VHT_CAP_RXSTBC_4 |
                                IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
                        sband->vht_cap.vht_mcs.rx_mcs_map =
                                cpu_to_le16(IEEE80211_VHT_MCS_SUPPORT_0_8 << 0 |
                                            IEEE80211_VHT_MCS_SUPPORT_0_8 << 2 |
                                            IEEE80211_VHT_MCS_SUPPORT_0_9 << 4 |
                                            IEEE80211_VHT_MCS_SUPPORT_0_8 << 6 |
                                            IEEE80211_VHT_MCS_SUPPORT_0_8 << 8 |
                                            IEEE80211_VHT_MCS_SUPPORT_0_9 << 10 |
                                            IEEE80211_VHT_MCS_SUPPORT_0_9 << 12 |
                                            IEEE80211_VHT_MCS_SUPPORT_0_8 << 14);
                        sband->vht_cap.vht_mcs.tx_mcs_map =
                                sband->vht_cap.vht_mcs.rx_mcs_map;
                }
                /* 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);

                tasklet_hrtimer_init(&data->beacon_timer,
                                     mac80211_hwsim_beacon,
                                     CLOCK_REALTIME, HRTIMER_MODE_ABS);

                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();
failed_unregister_driver:
        platform_driver_unregister(&mac80211_hwsim_driver);
        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);
        platform_driver_unregister(&mac80211_hwsim_driver);
}
module_exit(exit_mac80211_hwsim);