// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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>
 * Copyright (c) 2016 - 2017 Intel Deutschland GmbH
 * Copyright (C) 2018 - 2020 Intel Corporation
 */

/*
 * 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 <net/net_namespace.h>
#include <net/netns/generic.h>
#include <linux/rhashtable.h>
#include <linux/nospec.h>
#include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.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 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");

static bool support_p2p_device = true;
module_param(support_p2p_device, bool, 0444);
MODULE_PARM_DESC(support_p2p_device, "Support P2P-Device interface type");

/**
 * 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 = 5,
        .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),
                REG_RULE(5855-10, 5925+10, 40, 0, 33, 0),
        }
};

static const struct ieee80211_regdomain hwsim_world_regdom_custom_02 = {
        .n_reg_rules = 3,
        .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_NO_IR),
                REG_RULE(5855-10, 5925+10, 40, 0, 33, 0),
        }
};

static const struct ieee80211_regdomain *hwsim_world_regdom_custom[] = {
        &hwsim_world_regdom_custom_01,
        &hwsim_world_regdom_custom_02,
};

struct hwsim_vif_priv {
        u32 magic;
        u8 bssid[ETH_ALEN];
        bool assoc;
        bool bcn_en;
        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 unsigned int hwsim_net_id;

static DEFINE_IDA(hwsim_netgroup_ida);

struct hwsim_net {
        int netgroup;
        u32 wmediumd;
};

static inline int hwsim_net_get_netgroup(struct net *net)
{
        struct hwsim_net *hwsim_net = net_generic(net, hwsim_net_id);

        return hwsim_net->netgroup;
}

static inline int hwsim_net_set_netgroup(struct net *net)
{
        struct hwsim_net *hwsim_net = net_generic(net, hwsim_net_id);

        hwsim_net->netgroup = ida_simple_get(&hwsim_netgroup_ida,
                                             0, 0, GFP_KERNEL);
        return hwsim_net->netgroup >= 0 ? 0 : -ENOMEM;
}

static inline u32 hwsim_net_get_wmediumd(struct net *net)
{
        struct hwsim_net *hwsim_net = net_generic(net, hwsim_net_id);

        return hwsim_net->wmediumd;
}

static inline void hwsim_net_set_wmediumd(struct net *net, u32 portid)
{
        struct hwsim_net *hwsim_net = net_generic(net, hwsim_net_id);

        hwsim_net->wmediumd = portid;
}

static struct class *hwsim_class;

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

#define CHAN2G(_freq)  { \
        .band = NL80211_BAND_2GHZ, \
        .center_freq = (_freq), \
        .hw_value = (_freq), \
}

#define CHAN5G(_freq) { \
        .band = NL80211_BAND_5GHZ, \
        .center_freq = (_freq), \
        .hw_value = (_freq), \
}

#define CHAN6G(_freq) { \
        .band = NL80211_BAND_6GHZ, \
        .center_freq = (_freq), \
        .hw_value = (_freq), \
}

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 */
        CHAN5G(5845), /* Channel 169 */

        CHAN5G(5855), /* Channel 171 */
        CHAN5G(5860), /* Channel 172 */
        CHAN5G(5865), /* Channel 173 */
        CHAN5G(5870), /* Channel 174 */

        CHAN5G(5875), /* Channel 175 */
        CHAN5G(5880), /* Channel 176 */
        CHAN5G(5885), /* Channel 177 */
        CHAN5G(5890), /* Channel 178 */
        CHAN5G(5895), /* Channel 179 */
        CHAN5G(5900), /* Channel 180 */
        CHAN5G(5905), /* Channel 181 */

        CHAN5G(5910), /* Channel 182 */
        CHAN5G(5915), /* Channel 183 */
        CHAN5G(5920), /* Channel 184 */
        CHAN5G(5925), /* Channel 185 */
};

static const struct ieee80211_channel hwsim_channels_6ghz[] = {
        CHAN6G(5955), /* Channel 1 */
        CHAN6G(5975), /* Channel 5 */
        CHAN6G(5995), /* Channel 9 */
        CHAN6G(6015), /* Channel 13 */
        CHAN6G(6035), /* Channel 17 */
        CHAN6G(6055), /* Channel 21 */
        CHAN6G(6075), /* Channel 25 */
        CHAN6G(6095), /* Channel 29 */
        CHAN6G(6115), /* Channel 33 */
        CHAN6G(6135), /* Channel 37 */
        CHAN6G(6155), /* Channel 41 */
        CHAN6G(6175), /* Channel 45 */
        CHAN6G(6195), /* Channel 49 */
        CHAN6G(6215), /* Channel 53 */
        CHAN6G(6235), /* Channel 57 */
        CHAN6G(6255), /* Channel 61 */
        CHAN6G(6275), /* Channel 65 */
        CHAN6G(6295), /* Channel 69 */
        CHAN6G(6315), /* Channel 73 */
        CHAN6G(6335), /* Channel 77 */
        CHAN6G(6355), /* Channel 81 */
        CHAN6G(6375), /* Channel 85 */
        CHAN6G(6395), /* Channel 89 */
        CHAN6G(6415), /* Channel 93 */
        CHAN6G(6435), /* Channel 97 */
        CHAN6G(6455), /* Channel 181 */
        CHAN6G(6475), /* Channel 105 */
        CHAN6G(6495), /* Channel 109 */
        CHAN6G(6515), /* Channel 113 */
        CHAN6G(6535), /* Channel 117 */
        CHAN6G(6555), /* Channel 121 */
        CHAN6G(6575), /* Channel 125 */
        CHAN6G(6595), /* Channel 129 */
        CHAN6G(6615), /* Channel 133 */
        CHAN6G(6635), /* Channel 137 */
        CHAN6G(6655), /* Channel 141 */
        CHAN6G(6675), /* Channel 145 */
        CHAN6G(6695), /* Channel 149 */
        CHAN6G(6715), /* Channel 153 */
        CHAN6G(6735), /* Channel 157 */
        CHAN6G(6755), /* Channel 161 */
        CHAN6G(6775), /* Channel 165 */
        CHAN6G(6795), /* Channel 169 */
        CHAN6G(6815), /* Channel 173 */
        CHAN6G(6835), /* Channel 177 */
        CHAN6G(6855), /* Channel 181 */
        CHAN6G(6875), /* Channel 185 */
        CHAN6G(6895), /* Channel 189 */
        CHAN6G(6915), /* Channel 193 */
        CHAN6G(6935), /* Channel 197 */
        CHAN6G(6955), /* Channel 201 */
        CHAN6G(6975), /* Channel 205 */
        CHAN6G(6995), /* Channel 209 */
        CHAN6G(7015), /* Channel 213 */
        CHAN6G(7035), /* Channel 217 */
        CHAN6G(7055), /* Channel 221 */
        CHAN6G(7075), /* Channel 225 */
        CHAN6G(7095), /* Channel 229 */
        CHAN6G(7115), /* Channel 233 */
};

#define NUM_S1G_CHANS_US 51
static struct ieee80211_channel hwsim_channels_s1g[NUM_S1G_CHANS_US];

static const struct ieee80211_sta_s1g_cap hwsim_s1g_cap = {
        .s1g = true,
        .cap = { S1G_CAP0_SGI_1MHZ | S1G_CAP0_SGI_2MHZ,
                 0,
                 0,
                 S1G_CAP3_MAX_MPDU_LEN,
                 0,
                 S1G_CAP5_AMPDU,
                 0,
                 S1G_CAP7_DUP_1MHZ,
                 S1G_CAP8_TWT_RESPOND | S1G_CAP8_TWT_REQUEST,
                 0},
        .nss_mcs = { 0xfc | 1, /* MCS 7 for 1 SS */
        /* RX Highest Supported Long GI Data Rate 0:7 */
                     0,
        /* RX Highest Supported Long GI Data Rate 0:7 */
        /* TX S1G MCS Map 0:6 */
                     0xfa,
        /* TX S1G MCS Map :7 */
        /* TX Highest Supported Long GI Data Rate 0:6 */
                     0x80,
        /* TX Highest Supported Long GI Data Rate 7:8 */
        /* Rx Single spatial stream and S1G-MCS Map for 1MHz */
        /* Tx Single spatial stream and S1G-MCS Map for 1MHz */
                     0 },
};

static void hwsim_init_s1g_channels(struct ieee80211_channel *channels)
{
        int ch, freq;

        for (ch = 0; ch < NUM_S1G_CHANS_US; ch++) {
                freq = 902000 + (ch + 1) * 500;
                channels[ch].band = NL80211_BAND_S1GHZ;
                channels[ch].center_freq = KHZ_TO_MHZ(freq);
                channels[ch].freq_offset = freq % 1000;
                channels[ch].hw_value = ch + 1;
        }
}

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 const u32 hwsim_ciphers[] = {
        WLAN_CIPHER_SUITE_WEP40,
        WLAN_CIPHER_SUITE_WEP104,
        WLAN_CIPHER_SUITE_TKIP,
        WLAN_CIPHER_SUITE_CCMP,
        WLAN_CIPHER_SUITE_CCMP_256,
        WLAN_CIPHER_SUITE_GCMP,
        WLAN_CIPHER_SUITE_GCMP_256,
        WLAN_CIPHER_SUITE_AES_CMAC,
        WLAN_CIPHER_SUITE_BIP_CMAC_256,
        WLAN_CIPHER_SUITE_BIP_GMAC_128,
        WLAN_CIPHER_SUITE_BIP_GMAC_256,
};

#define OUI_QCA 0x001374
#define QCA_NL80211_SUBCMD_TEST 1
enum qca_nl80211_vendor_subcmds {
        QCA_WLAN_VENDOR_ATTR_TEST = 8,
        QCA_WLAN_VENDOR_ATTR_MAX = QCA_WLAN_VENDOR_ATTR_TEST
};

static const struct nla_policy
hwsim_vendor_test_policy[QCA_WLAN_VENDOR_ATTR_MAX + 1] = {
        [QCA_WLAN_VENDOR_ATTR_MAX] = { .type = NLA_U32 },
};

static int mac80211_hwsim_vendor_cmd_test(struct wiphy *wiphy,
                                          struct wireless_dev *wdev,
                                          const void *data, int data_len)
{
        struct sk_buff *skb;
        struct nlattr *tb[QCA_WLAN_VENDOR_ATTR_MAX + 1];
        int err;
        u32 val;

        err = nla_parse_deprecated(tb, QCA_WLAN_VENDOR_ATTR_MAX, data,
                                   data_len, hwsim_vendor_test_policy, NULL);
        if (err)
                return err;
        if (!tb[QCA_WLAN_VENDOR_ATTR_TEST])
                return -EINVAL;
        val = nla_get_u32(tb[QCA_WLAN_VENDOR_ATTR_TEST]);
        wiphy_dbg(wiphy, "%s: test=%u\n", __func__, val);

        /* Send a vendor event as a test. Note that this would not normally be
         * done within a command handler, but rather, based on some other
         * trigger. For simplicity, this command is used to trigger the event
         * here.
         *
         * event_idx = 0 (index in mac80211_hwsim_vendor_commands)
         */
        skb = cfg80211_vendor_event_alloc(wiphy, wdev, 100, 0, GFP_KERNEL);
        if (skb) {
                /* skb_put() or nla_put() will fill up data within
                 * NL80211_ATTR_VENDOR_DATA.
                 */

                /* Add vendor data */
                nla_put_u32(skb, QCA_WLAN_VENDOR_ATTR_TEST, val + 1);

                /* Send the event - this will call nla_nest_end() */
                cfg80211_vendor_event(skb, GFP_KERNEL);
        }

        /* Send a response to the command */
        skb = cfg80211_vendor_cmd_alloc_reply_skb(wiphy, 10);
        if (!skb)
                return -ENOMEM;

        /* skb_put() or nla_put() will fill up data within
         * NL80211_ATTR_VENDOR_DATA
         */
        nla_put_u32(skb, QCA_WLAN_VENDOR_ATTR_TEST, val + 2);

        return cfg80211_vendor_cmd_reply(skb);
}

static struct wiphy_vendor_command mac80211_hwsim_vendor_commands[] = {
        {
                .info = { .vendor_id = OUI_QCA,
                          .subcmd = QCA_NL80211_SUBCMD_TEST },
                .flags = WIPHY_VENDOR_CMD_NEED_NETDEV,
                .doit = mac80211_hwsim_vendor_cmd_test,
                .policy = hwsim_vendor_test_policy,
                .maxattr = QCA_WLAN_VENDOR_ATTR_MAX,
        }
};

/* Advertise support vendor specific events */
static const struct nl80211_vendor_cmd_info mac80211_hwsim_vendor_events[] = {
        { .vendor_id = OUI_QCA, .subcmd = 1 },
};

static DEFINE_SPINLOCK(hwsim_radio_lock);
static LIST_HEAD(hwsim_radios);
static struct rhashtable hwsim_radios_rht;
static int hwsim_radio_idx;
static int hwsim_radios_generation = 1;

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

struct mac80211_hwsim_data {
        struct list_head list;
        struct rhash_head rht;
        struct ieee80211_hw *hw;
        struct device *dev;
        struct ieee80211_supported_band bands[NUM_NL80211_BANDS];
        struct ieee80211_channel channels_2ghz[ARRAY_SIZE(hwsim_channels_2ghz)];
        struct ieee80211_channel channels_5ghz[ARRAY_SIZE(hwsim_channels_5ghz)];
        struct ieee80211_channel channels_6ghz[ARRAY_SIZE(hwsim_channels_6ghz)];
        struct ieee80211_channel channels_s1g[ARRAY_SIZE(hwsim_channels_s1g)];
        struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
        struct ieee80211_iface_combination if_combination;
        struct ieee80211_iface_limit if_limits[3];
        int n_if_limits;

        u32 ciphers[ARRAY_SIZE(hwsim_ciphers)];

        struct mac_address addresses[2];
        struct ieee80211_chanctx_conf *chanctx;
        int channels, idx;
        bool use_chanctx;
        bool destroy_on_close;
        u32 portid;
        char alpha2[2];
        const struct ieee80211_regdomain *regd;

        struct ieee80211_channel *tmp_chan;
        struct ieee80211_channel *roc_chan;
        u32 roc_duration;
        struct delayed_work roc_start;
        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;
        u8 scan_addr[ETH_ALEN];
        struct {
                struct ieee80211_channel *channel;
                unsigned long next_start, start, end;
        } survey_data[ARRAY_SIZE(hwsim_channels_2ghz) +
                      ARRAY_SIZE(hwsim_channels_5ghz) +
                      ARRAY_SIZE(hwsim_channels_6ghz)];

        struct ieee80211_channel *channel;
        u64 beacon_int  /* beacon interval in us */;
        unsigned int rx_filter;
        bool started, idle, scanning;
        struct mutex mutex;
        struct hrtimer beacon_timer;
        enum ps_mode {
                PS_DISABLED, PS_ENABLED, PS_AUTO_POLL, PS_MANUAL_POLL
        } ps;
        bool ps_poll_pending;
        struct dentry *debugfs;

        uintptr_t pending_cookie;
        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 than one group.
         */
        u64 group;

        /* group shared by radios created in the same netns */
        int netgroup;
        /* wmediumd portid responsible for netgroup of this radio */
        u32 wmediumd;

        /* 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;

        /* Stats */
        u64 tx_pkts;
        u64 rx_pkts;
        u64 tx_bytes;
        u64 rx_bytes;
        u64 tx_dropped;
        u64 tx_failed;
};

static const struct rhashtable_params hwsim_rht_params = {
        .nelem_hint = 2,
        .automatic_shrinking = true,
        .key_len = ETH_ALEN,
        .key_offset = offsetof(struct mac80211_hwsim_data, addresses[1]),
        .head_offset = offsetof(struct mac80211_hwsim_data, rht),
};

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;

struct hwsim_radiotap_ack_hdr {
        struct ieee80211_radiotap_header hdr;
        u8 rt_flags;
        u8 pad;
        __le16 rt_channel;
        __le16 rt_chbitmask;
} __packed;

/* MAC80211_HWSIM netlink family */
static struct genl_family hwsim_genl_family;

enum hwsim_multicast_groups {
        HWSIM_MCGRP_CONFIG,
};

static const struct genl_multicast_group hwsim_mcgrps[] = {
        [HWSIM_MCGRP_CONFIG] = { .name = "config", },
};

/* MAC80211_HWSIM netlink policy */

static const struct nla_policy hwsim_genl_policy[HWSIM_ATTR_MAX + 1] = {
        [HWSIM_ATTR_ADDR_RECEIVER] = NLA_POLICY_ETH_ADDR_COMPAT,
        [HWSIM_ATTR_ADDR_TRANSMITTER] = NLA_POLICY_ETH_ADDR_COMPAT,
        [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_BINARY,
                                 .len = IEEE80211_TX_MAX_RATES *
                                        sizeof(struct hwsim_tx_rate)},
        [HWSIM_ATTR_COOKIE] = { .type = NLA_U64 },
        [HWSIM_ATTR_CHANNELS] = { .type = NLA_U32 },
        [HWSIM_ATTR_RADIO_ID] = { .type = NLA_U32 },
        [HWSIM_ATTR_REG_HINT_ALPHA2] = { .type = NLA_STRING, .len = 2 },
        [HWSIM_ATTR_REG_CUSTOM_REG] = { .type = NLA_U32 },
        [HWSIM_ATTR_REG_STRICT_REG] = { .type = NLA_FLAG },
        [HWSIM_ATTR_SUPPORT_P2P_DEVICE] = { .type = NLA_FLAG },
        [HWSIM_ATTR_USE_CHANCTX] = { .type = NLA_FLAG },
        [HWSIM_ATTR_DESTROY_RADIO_ON_CLOSE] = { .type = NLA_FLAG },
        [HWSIM_ATTR_RADIO_NAME] = { .type = NLA_STRING },
        [HWSIM_ATTR_NO_VIF] = { .type = NLA_FLAG },
        [HWSIM_ATTR_FREQ] = { .type = NLA_U32 },
        [HWSIM_ATTR_TX_INFO_FLAGS] = { .type = NLA_BINARY },
        [HWSIM_ATTR_PERM_ADDR] = NLA_POLICY_ETH_ADDR_COMPAT,
        [HWSIM_ATTR_IFTYPE_SUPPORT] = { .type = NLA_U32 },
        [HWSIM_ATTR_CIPHER_SUPPORT] = { .type = NLA_BINARY },
};

#if IS_REACHABLE(CONFIG_VIRTIO)

/* MAC80211_HWSIM virtio queues */
static struct virtqueue *hwsim_vqs[HWSIM_NUM_VQS];
static bool hwsim_virtio_enabled;
static DEFINE_SPINLOCK(hwsim_virtio_lock);

static void hwsim_virtio_rx_work(struct work_struct *work);
static DECLARE_WORK(hwsim_virtio_rx, hwsim_virtio_rx_work);

static int hwsim_tx_virtio(struct mac80211_hwsim_data *data,
                           struct sk_buff *skb)
{
        struct scatterlist sg[1];
        unsigned long flags;
        int err;

        spin_lock_irqsave(&hwsim_virtio_lock, flags);
        if (!hwsim_virtio_enabled) {
                err = -ENODEV;
                goto out_free;
        }

        sg_init_one(sg, skb->head, skb_end_offset(skb));
        err = virtqueue_add_outbuf(hwsim_vqs[HWSIM_VQ_TX], sg, 1, skb,
                                   GFP_ATOMIC);
        if (err)
                goto out_free;
        virtqueue_kick(hwsim_vqs[HWSIM_VQ_TX]);
        spin_unlock_irqrestore(&hwsim_virtio_lock, flags);
        return 0;

out_free:
        spin_unlock_irqrestore(&hwsim_virtio_lock, flags);
        nlmsg_free(skb);
        return err;
}
#else
/* cause a linker error if this ends up being needed */
extern int hwsim_tx_virtio(struct mac80211_hwsim_data *data,
                           struct sk_buff *skb);
#define hwsim_virtio_enabled false
#endif

static void mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
                                    struct sk_buff *skb,
                                    struct ieee80211_channel *chan);

/* sysfs attributes */
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_dbg(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 = 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_dbg(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 = skb_put(skb, sizeof(*hdr) - ETH_ALEN);
        hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
                                         IEEE80211_STYPE_NULLFUNC |
                                         IEEE80211_FCTL_TODS |
                                         (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;

        if (val == PS_MANUAL_POLL) {
                if (data->ps != PS_ENABLED)
                        return -EINVAL;
                local_bh_disable();
                ieee80211_iterate_active_interfaces_atomic(
                        data->hw, IEEE80211_IFACE_ITER_NORMAL,
                        hwsim_send_ps_poll, data);
                local_bh_enable();
                return 0;
        }
        old_ps = data->ps;
        data->ps = val;

        local_bh_disable();
        if (old_ps == PS_DISABLED && val != PS_DISABLED) {
                ieee80211_iterate_active_interfaces_atomic(
                        data->hw, IEEE80211_IFACE_ITER_NORMAL,
                        hwsim_send_nullfunc_ps, data);
        } else if (old_ps != PS_DISABLED && val == PS_DISABLED) {
                ieee80211_iterate_active_interfaces_atomic(
                        data->hw, IEEE80211_IFACE_ITER_NORMAL,
                        hwsim_send_nullfunc_no_ps, data);
        }
        local_bh_enable();

        return 0;
}

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

static int hwsim_write_simulate_radar(void *dat, u64 val)
{
        struct mac80211_hwsim_data *data = dat;

        ieee80211_radar_detected(data->hw);

        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(hwsim_simulate_radar, NULL,
                         hwsim_write_simulate_radar, "%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_DEBUGFS_ATTRIBUTE(hwsim_fops_group,
                         hwsim_fops_group_read, hwsim_fops_group_write,
                         "%llx\n");

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;
        u64 delta = abs(tsf - now);

        /* adjust after beaconing with new timestamp at old TBTT */
        if (tsf > now) {
                data->tsf_offset += delta;
                data->bcn_delta = do_div(delta, bcn_int);
        } else {
                data->tsf_offset -= delta;
                data->bcn_delta = -(s64)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, bitrate;
        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
        struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);

        if (!txrate)
                bitrate = 0;
        else
                bitrate = txrate->bitrate;

        if (!netif_running(hwsim_mon))
                return;

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

        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 = bitrate / 5;
        hdr->rt_channel = cpu_to_le16(chan->center_freq);
        flags = IEEE80211_CHAN_2GHZ;
        if (txrate && 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_reset_mac_header(skb);
        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_ack_hdr *hdr;
        u16 flags;
        struct ieee80211_hdr *hdr11;

        if (!netif_running(hwsim_mon))
                return;

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

        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->pad = 0;
        hdr->rt_channel = cpu_to_le16(chan->center_freq);
        flags = IEEE80211_CHAN_2GHZ;
        hdr->rt_chbitmask = cpu_to_le16(flags);

        hdr11 = 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_reset_mac_header(skb);
        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);
}

struct mac80211_hwsim_addr_match_data {
        u8 addr[ETH_ALEN];
        bool ret;
};

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 = {
                .ret = false,
        };

        if (data->scanning && memcmp(addr, data->scan_addr, ETH_ALEN) == 0)
                return true;

        memcpy(md.addr, addr, ETH_ALEN);

        ieee80211_iterate_active_interfaces_atomic(data->hw,
                                                   IEEE80211_IFACE_ITER_NORMAL,
                                                   mac80211_hwsim_addr_iter,
                                                   &md);

        return md.ret;
}

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 &&
                    mac80211_hwsim_addr_match(data, skb->data + 4)) {
                        data->ps_poll_pending = false;
                        return true;
                }
                return false;
        }

        return true;
}

static int hwsim_unicast_netgroup(struct mac80211_hwsim_data *data,
                                  struct sk_buff *skb, int portid)
{
        struct net *net;
        bool found = false;
        int res = -ENOENT;

        rcu_read_lock();
        for_each_net_rcu(net) {
                if (data->netgroup == hwsim_net_get_netgroup(net)) {
                        res = genlmsg_unicast(net, skb, portid);
                        found = true;
                        break;
                }
        }
        rcu_read_unlock();

        if (!found)
                nlmsg_free(skb);

        return res;
}

static void mac80211_hwsim_config_mac_nl(struct ieee80211_hw *hw,
                                         const u8 *addr, bool add)
{
        struct mac80211_hwsim_data *data = hw->priv;
        u32 _portid = READ_ONCE(data->wmediumd);
        struct sk_buff *skb;
        void *msg_head;

        if (!_portid && !hwsim_virtio_enabled)
                return;

        skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_ATOMIC);
        if (!skb)
                return;

        msg_head = genlmsg_put(skb, 0, 0, &hwsim_genl_family, 0,
                               add ? HWSIM_CMD_ADD_MAC_ADDR :
                                     HWSIM_CMD_DEL_MAC_ADDR);
        if (!msg_head) {
                pr_debug("mac80211_hwsim: problem with msg_head\n");
                goto nla_put_failure;
        }

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

        if (nla_put(skb, HWSIM_ATTR_ADDR_RECEIVER, ETH_ALEN, addr))
                goto nla_put_failure;

        genlmsg_end(skb, msg_head);

        if (hwsim_virtio_enabled)
                hwsim_tx_virtio(data, skb);
        else
                hwsim_unicast_netgroup(data, skb, _portid);
        return;
nla_put_failure:
        nlmsg_free(skb);
}

static inline u16 trans_tx_rate_flags_ieee2hwsim(struct ieee80211_tx_rate *rate)
{
        u16 result = 0;

        if (rate->flags & IEEE80211_TX_RC_USE_RTS_CTS)
                result |= MAC80211_HWSIM_TX_RC_USE_RTS_CTS;
        if (rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
                result |= MAC80211_HWSIM_TX_RC_USE_CTS_PROTECT;
        if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
                result |= MAC80211_HWSIM_TX_RC_USE_SHORT_PREAMBLE;
        if (rate->flags & IEEE80211_TX_RC_MCS)
                result |= MAC80211_HWSIM_TX_RC_MCS;
        if (rate->flags & IEEE80211_TX_RC_GREEN_FIELD)
                result |= MAC80211_HWSIM_TX_RC_GREEN_FIELD;
        if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
                result |= MAC80211_HWSIM_TX_RC_40_MHZ_WIDTH;
        if (rate->flags & IEEE80211_TX_RC_DUP_DATA)
                result |= MAC80211_HWSIM_TX_RC_DUP_DATA;
        if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
                result |= MAC80211_HWSIM_TX_RC_SHORT_GI;
        if (rate->flags & IEEE80211_TX_RC_VHT_MCS)
                result |= MAC80211_HWSIM_TX_RC_VHT_MCS;
        if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
                result |= MAC80211_HWSIM_TX_RC_80_MHZ_WIDTH;
        if (rate->flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
                result |= MAC80211_HWSIM_TX_RC_160_MHZ_WIDTH;

        return result;
}

static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw,
                                       struct sk_buff *my_skb,
                                       int dst_portid,
                                       struct ieee80211_channel *channel)
{
        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];
        struct hwsim_tx_rate_flag tx_attempts_flags[IEEE80211_TX_MAX_RATES];
        uintptr_t cookie;

        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) {
                        ieee80211_free_txskb(hw, skb_dequeue(&data->pending));
                        data->tx_dropped++;
                }
        }

        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) {
                pr_debug("mac80211_hwsim: problem with msg_head\n");
                goto nla_put_failure;
        }

        if (nla_put(skb, HWSIM_ATTR_ADDR_TRANSMITTER,
                    ETH_ALEN, 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;

        if (nla_put_u32(skb, HWSIM_ATTR_FREQ, channel->center_freq))
                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_flags[i].idx = info->status.rates[i].idx;
                tx_attempts[i].count = info->status.rates[i].count;
                tx_attempts_flags[i].flags =
                                trans_tx_rate_flags_ieee2hwsim(
                                                &info->status.rates[i]);
        }

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

        if (nla_put(skb, HWSIM_ATTR_TX_INFO_FLAGS,
                    sizeof(struct hwsim_tx_rate_flag) * IEEE80211_TX_MAX_RATES,
                    tx_attempts_flags))
                goto nla_put_failure;

        /* We create a cookie to identify this skb */
        data->pending_cookie++;
        cookie = data->pending_cookie;
        info->rate_driver_data[0] = (void *)cookie;
        if (nla_put_u64_64bit(skb, HWSIM_ATTR_COOKIE, cookie, HWSIM_ATTR_PAD))
                goto nla_put_failure;

        genlmsg_end(skb, msg_head);

        if (hwsim_virtio_enabled) {
                if (hwsim_tx_virtio(data, skb))
                        goto err_free_txskb;
        } else {
                if (hwsim_unicast_netgroup(data, skb, dst_portid))
                        goto err_free_txskb;
        }

        /* Enqueue the packet */
        skb_queue_tail(&data->pending, my_skb);
        data->tx_pkts++;
        data->tx_bytes += my_skb->len;
        return;

nla_put_failure:
        nlmsg_free(skb);
err_free_txskb:
        pr_debug("mac80211_hwsim: error occurred in %s\n", __func__);
        ieee80211_free_txskb(hw, my_skb);
        data->tx_failed++;
}

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 void mac80211_hwsim_add_vendor_rtap(struct sk_buff *skb)
{
        /*
         * To enable this code, #define the HWSIM_RADIOTAP_OUI,
         * e.g. like this:
         * #define HWSIM_RADIOTAP_OUI "\x02\x00\x00"
         * (but you should use a valid OUI, not that)
         *
         * If anyone wants to 'donate' a radiotap OUI/subns code
         * please send a patch removing this #ifdef and changing
         * the values accordingly.
         */
#ifdef HWSIM_RADIOTAP_OUI
        struct ieee80211_vendor_radiotap *rtap;

        /*
         * Note that this code requires the headroom in the SKB
         * that was allocated earlier.
         */
        rtap = skb_push(skb, sizeof(*rtap) + 8 + 4);
        rtap->oui[0] = HWSIM_RADIOTAP_OUI[0];
        rtap->oui[1] = HWSIM_RADIOTAP_OUI[1];
        rtap->oui[2] = HWSIM_RADIOTAP_OUI[2];
        rtap->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.
         */
        rtap->present = BIT(0);
        /* We have 8 bytes of (dummy) data */
        rtap->len = 8;
        /* For testing, also require it to be aligned */
        rtap->align = 8;
        /* And also test that padding works, 4 bytes */
        rtap->pad = 4;
        /* push the data */
        memcpy(rtap->data, "ABCDEFGH", 8);
        /* make sure to clear padding, mac80211 doesn't */
        memset(rtap->data + 8, 0, 4);

        IEEE80211_SKB_RXCB(skb)->flag |= RX_FLAG_RADIOTAP_VENDOR_DATA;
#endif
}

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.freq_offset = chan->freq_offset ? 1 : 0;
        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.nss =
                        ieee80211_rate_get_vht_nss(&info->control.rates[0]);
                rx_status.encoding = RX_ENC_VHT;
        } else {
                rx_status.rate_idx = info->control.rates[0].idx;
                if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
                        rx_status.encoding = RX_ENC_HT;
        }
        if (info->control.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
                rx_status.bw = RATE_INFO_BW_40;
        else if (info->control.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
                rx_status.bw = RATE_INFO_BW_80;
        else if (info->control.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
                rx_status.bw = RATE_INFO_BW_160;
        else
                rx_status.bw = RATE_INFO_BW_20;
        if (info->control.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
                rx_status.enc_flags |= RX_ENC_FLAG_SHORT_GI;
        /* TODO: simulate real signal strength (and optional packet loss) */
        rx_status.signal = -50;
        if (info->control.vif)
                rx_status.signal += info->control.vif->bss_conf.txpower;

        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;
        skb_ext_reset(skb);
        nf_reset_ct(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)) {
                rx_status.boottime_ns = ktime_get_boottime_ns();
                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 (data->netgroup != data2->netgroup)
                        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;

                memcpy(IEEE80211_SKB_RXCB(nskb), &rx_status, sizeof(rx_status));

                mac80211_hwsim_add_vendor_rtap(nskb);

                data2->rx_pkts++;
                data2->rx_bytes += nskb->len;
                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_hdr *hdr = (void *)skb->data;
        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 */
                ieee80211_free_txskb(hw, skb);
                return;
        }

        if (!data->use_chanctx) {
                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)) {
                ieee80211_free_txskb(hw, skb);
                return;
        }

        if (data->idle && !data->tmp_chan) {
                wiphy_dbg(hw->wiphy, "Trying to TX when idle - reject\n");
                ieee80211_free_txskb(hw, skb);
                return;
        }

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

        if (ieee80211_hw_check(hw, SUPPORTS_RC_TABLE))
                ieee80211_get_tx_rates(txi->control.vif, control->sta, skb,
                                       txi->control.rates,
                                       ARRAY_SIZE(txi->control.rates));

        if (skb->len >= 24 + 8 &&
            ieee80211_is_probe_resp(hdr->frame_control)) {
                /* fake header transmission time */
                struct ieee80211_mgmt *mgmt;
                struct ieee80211_rate *txrate;
                /* TODO: get MCS */
                int bitrate = 100;
                u64 ts;

                mgmt = (struct ieee80211_mgmt *)skb->data;
                txrate = ieee80211_get_tx_rate(hw, txi);
                if (txrate)
                        bitrate = txrate->bitrate;
                ts = mac80211_hwsim_get_tsf_raw();
                mgmt->u.probe_resp.timestamp =
                        cpu_to_le64(ts + data->tsf_offset +
                                    24 * 8 * 10 / bitrate);
        }

        mac80211_hwsim_monitor_rx(hw, skb, channel);

        /* wmediumd mode check */
        _portid = READ_ONCE(data->wmediumd);

        if (_portid || hwsim_virtio_enabled)
                return mac80211_hwsim_tx_frame_nl(hw, skb, _portid, channel);

        /* NO wmediumd detected, perfect medium simulation */
        data->tx_pkts++;
        data->tx_bytes += skb->len;
        ack = mac80211_hwsim_tx_frame_no_nl(hw, skb, channel);

        if (ack && skb->len >= 16)
                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_dbg(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;
        hrtimer_cancel(&data->beacon_timer);

        while (!skb_queue_empty(&data->pending))
                ieee80211_free_txskb(hw, skb_dequeue(&data->pending));

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


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

        if (vif->type != NL80211_IFTYPE_MONITOR)
                mac80211_hwsim_config_mac_nl(hw, vif->addr, true);

        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_dbg(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_dbg(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);
        if (vif->type != NL80211_IFTYPE_MONITOR)
                mac80211_hwsim_config_mac_nl(hw, vif->addr, false);
}

static void mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
                                    struct sk_buff *skb,
                                    struct ieee80211_channel *chan)
{
        struct mac80211_hwsim_data *data = hw->priv;
        u32 _pid = READ_ONCE(data->wmediumd);

        if (ieee80211_hw_check(hw, SUPPORTS_RC_TABLE)) {
                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 || hwsim_virtio_enabled)
                return mac80211_hwsim_tx_frame_nl(hw, skb, _pid, chan);

        data->tx_pkts++;
        data->tx_bytes += skb->len;
        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;
        /* TODO: get MCS */
        int bitrate = 100;

        hwsim_check_magic(vif);

        if (vif->type != NL80211_IFTYPE_AP &&
            vif->type != NL80211_IFTYPE_MESH_POINT &&
            vif->type != NL80211_IFTYPE_ADHOC &&
            vif->type != NL80211_IFTYPE_OCB)
                return;

        skb = ieee80211_beacon_get(hw, vif);
        if (skb == NULL)
                return;
        info = IEEE80211_SKB_CB(skb);
        if (ieee80211_hw_check(hw, SUPPORTS_RC_TABLE))
                ieee80211_get_tx_rates(vif, NULL, skb,
                                       info->control.rates,
                                       ARRAY_SIZE(info->control.rates));

        txrate = ieee80211_get_tx_rate(hw, info);
        if (txrate)
                bitrate = txrate->bitrate;

        mgmt = (struct ieee80211_mgmt *) skb->data;
        /* fake header transmission time */
        data->abs_bcn_ts = mac80211_hwsim_get_tsf_raw();
        if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
                struct ieee80211_ext *ext = (void *) mgmt;

                ext->u.s1g_beacon.timestamp = cpu_to_le32(data->abs_bcn_ts +
                                                          data->tsf_offset +
                                                          10 * 8 * 10 /
                                                          bitrate);
        } else {
                mgmt->u.beacon.timestamp = cpu_to_le64(data->abs_bcn_ts +
                                                       data->tsf_offset +
                                                       24 * 8 * 10 /
                                                       bitrate);
        }

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

        while ((skb = ieee80211_get_buffered_bc(hw, vif)) != NULL) {
                mac80211_hwsim_tx_frame(hw, skb,
                                rcu_dereference(vif->chanctx_conf)->def.chan);
        }

        if (vif->csa_active && ieee80211_beacon_cntdwn_is_complete(vif))
                ieee80211_csa_finish(vif);
}

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

        if (!data->started)
                return HRTIMER_NORESTART;

        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;
        }
        hrtimer_forward(&data->beacon_timer, hrtimer_get_expires(timer),
                        ns_to_ktime(bcn_int * NSEC_PER_USEC));
        return HRTIMER_RESTART;
}

static const char * const hwsim_chanwidths[] = {
        [NL80211_CHAN_WIDTH_5] = "ht5",
        [NL80211_CHAN_WIDTH_10] = "ht10",
        [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",
        [NL80211_CHAN_WIDTH_1] = "1MHz",
        [NL80211_CHAN_WIDTH_2] = "2MHz",
        [NL80211_CHAN_WIDTH_4] = "4MHz",
        [NL80211_CHAN_WIDTH_8] = "8MHz",
        [NL80211_CHAN_WIDTH_16] = "16MHz",
};

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",
        };
        int idx;

        if (conf->chandef.chan)
                wiphy_dbg(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_dbg(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);

        WARN_ON(conf->chandef.chan && data->use_chanctx);

        mutex_lock(&data->mutex);
        if (data->scanning && conf->chandef.chan) {
                for (idx = 0; idx < ARRAY_SIZE(data->survey_data); idx++) {
                        if (data->survey_data[idx].channel == data->channel) {
                                data->survey_data[idx].start =
                                        data->survey_data[idx].next_start;
                                data->survey_data[idx].end = jiffies;
                                break;
                        }
                }

                data->channel = conf->chandef.chan;

                for (idx = 0; idx < ARRAY_SIZE(data->survey_data); idx++) {
                        if (data->survey_data[idx].channel &&
                            data->survey_data[idx].channel != data->channel)
                                continue;
                        data->survey_data[idx].channel = data->channel;
                        data->survey_data[idx].next_start = jiffies;
                        break;
                }
        } else {
                data->channel = conf->chandef.chan;
        }
        mutex_unlock(&data->mutex);

        if (!data->started || !data->beacon_int)
                hrtimer_cancel(&data->beacon_timer);
        else if (!hrtimer_is_queued(&data->beacon_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);

                hrtimer_start(&data->beacon_timer,
                              ns_to_ktime(until_tbtt * NSEC_PER_USEC),
                              HRTIMER_MODE_REL_SOFT);
        }

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

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

        *total_flags = data->rx_filter;
}

static void mac80211_hwsim_bcn_en_iter(void *data, u8 *mac,
                                       struct ieee80211_vif *vif)
{
        unsigned int *count = data;
        struct hwsim_vif_priv *vp = (void *)vif->drv_priv;

        if (vp->bcn_en)
                (*count)++;
}

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;