text: /*
   * 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
   *
   * 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 <net/net_namespace.h>
  #include <net/netns/generic.h>
  #include <linux/rhashtable.h>
  #include <linux/nospec.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 = 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_NO_IR),
  	}
  };
  
  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), \
  	.max_power = 20, \
  }
  
  #define CHAN5G(_freq) { \
  	.band = NL80211_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 */
  	CHAN5G(5845), /* Channel 169 */
  };
  
  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 }
  };
  
  #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(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,
  	}
  };
  
  /* Advertise support vendor specific events */
  static const struct nl80211_vendor_cmd_info mac80211_hwsim_vendor_events[] = {
  	{ .vendor_id = OUI_QCA, .subcmd = 1 },
  };
  
  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) },
  	/* must be last, see hwsim_if_comb */
  	{ .max = 1, .types = BIT(NL80211_IFTYPE_P2P_DEVICE) }
  };
  
  static const struct ieee80211_iface_combination hwsim_if_comb[] = {
  	{
  		.limits = hwsim_if_limits,
  		/* remove the last entry which is P2P_DEVICE */
  		.n_limits = ARRAY_SIZE(hwsim_if_limits) - 1,
  		.max_interfaces = 2048,
  		.num_different_channels = 1,
  		.radar_detect_widths = BIT(NL80211_CHAN_WIDTH_20_NOHT) |
  				       BIT(NL80211_CHAN_WIDTH_20) |
  				       BIT(NL80211_CHAN_WIDTH_40) |
  				       BIT(NL80211_CHAN_WIDTH_80) |
  				       BIT(NL80211_CHAN_WIDTH_160),
  	},
  };
  
  static const struct ieee80211_iface_combination hwsim_if_comb_p2p_dev[] = {
  	{
  		.limits = hwsim_if_limits,
  		.n_limits = ARRAY_SIZE(hwsim_if_limits),
  		.max_interfaces = 2048,
  		.num_different_channels = 1,
  		.radar_detect_widths = BIT(NL80211_CHAN_WIDTH_20_NOHT) |
  				       BIT(NL80211_CHAN_WIDTH_20) |
  				       BIT(NL80211_CHAN_WIDTH_40) |
  				       BIT(NL80211_CHAN_WIDTH_80) |
  				       BIT(NL80211_CHAN_WIDTH_160),
  	},
  };
  
  static spinlock_t hwsim_radio_lock;
  static LIST_HEAD(hwsim_radios);
  static struct workqueue_struct *hwsim_wq;
  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_rate rates[ARRAY_SIZE(hwsim_rates)];
  	struct ieee80211_iface_combination if_combination;
  
  	struct mac_address addresses[2];
  	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)];
  
  	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;
  
  	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] = { .type = NLA_UNSPEC, .len = ETH_ALEN },
  	[HWSIM_ATTR_ADDR_TRANSMITTER] = { .type = NLA_UNSPEC, .len = ETH_ALEN },
  	[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 },
  	[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_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_PERM_ADDR] = { .type = NLA_UNSPEC, .len = ETH_ALEN },
  };
  
  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_SIMPLE_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_SIMPLE_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_SIMPLE_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;
  	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
  	struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);
  
  	if (WARN_ON(!txrate))
  		return;
  
  	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 = 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_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 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 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, data->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_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.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;
  	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 (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;
  		u64 ts;
  
  		mgmt = (struct ieee80211_mgmt *)skb->data;
  		txrate = ieee80211_get_tx_rate(hw, txi);
  		ts = mac80211_hwsim_get_tsf_raw();
  		mgmt->u.probe_resp.timestamp =
  			cpu_to_le64(ts + data->tsf_offset +
  				    24 * 8 * 10 / txrate->bitrate);
  	}
  
  	mac80211_hwsim_monitor_rx(hw, skb, channel);
  
  	/* wmediumd mode check */
  	_portid = READ_ONCE(data->wmediumd);
  
  	if (_portid)
  		return mac80211_hwsim_tx_frame_nl(hw, skb, _portid);
  
  	/* 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;
  	tasklet_hrtimer_cancel(&data->beacon_timer);
  	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);
  
  	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);
  }
  
  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)
  		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 (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);
  
  	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);
  
  	if (vif->csa_active && ieee80211_csa_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.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",
  	};
  	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)
  		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_dbg(hw->wiphy, "%s\n", __func__);
  
  	data->rx_filter = 0;
  	if (*total_flags & FIF_ALLMULTI)
  		data->rx_filter |= FIF_ALLMULTI;
  
  	*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;
  	struct mac80211_hwsim_data *data = hw->priv;
  
  	hwsim_check_magic(vif);
  
  	wiphy_dbg(hw->wiphy, "%s(changed=0x%x vif->addr=%pM)\n",
  		  __func__, changed, vif->addr);
  
  	if (changed & BSS_CHANGED_BSSID) {
  		wiphy_dbg(hw->wiphy, "%s: BSSID changed: %pM\n",
  			  __func__, info->bssid);
  		memcpy(vp->bssid, info->bssid, ETH_ALEN);
  	}
  
  	if (changed & BSS_CHANGED_ASSOC) {
  		wiphy_dbg(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_ENABLED) {
  		wiphy_dbg(hw->wiphy, "  BCN EN: %d (BI=%u)\n",
  			  info->enable_beacon, info->beacon_int);
  		vp->bcn_en = info->enable_beacon;
  		if (data->started &&
  		    !hrtimer_is_queued(&data->beacon_timer.timer) &&
  		    info->enable_beacon) {
  			u64 tsf, until_tbtt;
  			u32 bcn_int;
  			data->beacon_int = info->beacon_int * 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) {
  			unsigned int count = 0;
  			ieee80211_iterate_active_interfaces_atomic(
  				data->hw, IEEE80211_IFACE_ITER_NORMAL,
  				mac80211_hwsim_bcn_en_iter, &count);
  			wiphy_dbg(hw->wiphy, "  beaconing vifs remaining: %u",
  				  count);
  			if (count == 0) {
  				tasklet_hrtimer_cancel(&data->beacon_timer);
  				data->beacon_int = 0;
  			}
  		}
  	}
  
  	if (changed & BSS_CHANGED_ERP_CTS_PROT) {
  		wiphy_dbg(hw->wiphy, "  ERP_CTS_PROT: %d\n",
  			  info->use_cts_prot);
  	}
  
  	if (changed & BSS_CHANGED_ERP_PREAMBLE) {
  		wiphy_dbg(hw->wiphy, "  ERP_PREAMBLE: %d\n",
  			  info->use_short_preamble);
  	}
  
  	if (changed & BSS_CHANGED_ERP_SLOT) {
  		wiphy_dbg(hw->wiphy, "  ERP_SLOT: %d\n", info->use_short_slot);
  	}
  
  	if (changed & BSS_CHANGED_HT) {
  		wiphy_dbg(hw->wiphy, "  HT: op_mode=0x%x\n",
  			  info->ht_operation_mode);
  	}
  
  	if (changed & BSS_CHANGED_BASIC_RATES) {
  		wiphy_dbg(hw->wiphy, "  BASIC_RATES: 0x%llx\n",
  			  (unsigned long long) info->basic_rates);
  	}
  
  	if (changed & BSS_CHANGED_TXPOWER)
  		wiphy_dbg(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_dbg(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 mac80211_hwsim_data *hwsim = hw->priv;
  
  	if (idx < 0 || idx >= ARRAY_SIZE(hwsim->survey_data))
  		return -ENOENT;
  
  	mutex_lock(&hwsim->mutex);
  	survey->channel = hwsim->survey_data[idx].channel;
  	if (!survey->channel) {
  		mutex_unlock(&hwsim->mutex);
  		return -ENOENT;
  	}
  
  	/*
  	 * Magically conjured dummy values --- this is only ok for simulated hardware.
  	 *
  	 * A real driver which cannot determine real values noise MUST NOT
  	 * report any, especially not a magically conjured ones :-)
  	 */
  	survey->filled = SURVEY_INFO_NOISE_DBM |
  			 SURVEY_INFO_TIME |
  			 SURVEY_INFO_TIME_BUSY;
  	survey->noise = -92;
  	survey->time =
  		jiffies_to_msecs(hwsim->survey_data[idx].end -
  				 hwsim->survey_data[idx].start);
  	/* report 12.5% of channel time is used */
  	survey->time_busy = survey->time/8;
  	mutex_unlock(&hwsim->mutex);
  
  	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 mac80211_hwsim_testmode_cmd(struct ieee80211_hw *hw,
  				       struct ieee80211_vif *vif,
  				       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, NULL);
  	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,
  				       struct ieee80211_ampdu_params *params)
  {
  	struct ieee80211_sta *sta = params->sta;
  	enum ieee80211_ampdu_mlme_action action = params->action;
  	u16 tid = params->tid;
  
  	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,
  				 struct ieee80211_vif *vif,
  				 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) {
  		struct cfg80211_scan_info info = {
  			.aborted = false,
  		};
  
  		wiphy_dbg(hwsim->hw->wiphy, "hw scan complete\n");
  		ieee80211_scan_completed(hwsim->hw, &info);
  		hwsim->hw_scan_request = NULL;
  		hwsim->hw_scan_vif = NULL;
  		hwsim->tmp_chan = NULL;
  		mutex_unlock(&hwsim->mutex);
  		return;
  	}
  
  	wiphy_dbg(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_NO_IR |
  				      IEEE80211_CHAN_RADAR) ||
  	    !req->n_ssids) {
  		dwell = 120;
  	} else {
  		dwell = 30;
  		/* send probes */
  		for (i = 0; i < req->n_ssids; i++) {
  			struct sk_buff *probe;
  			struct ieee80211_mgmt *mgmt;
  
  			probe = ieee80211_probereq_get(hwsim->hw,
  						       hwsim->scan_addr,
  						       req->ssids[i].ssid,
  						       req->ssids[i].ssid_len,
  						       req->ie_len);
  			if (!probe)
  				continue;
  
  			mgmt = (struct ieee80211_mgmt *) probe->data;
  			memcpy(mgmt->da, req->bssid, ETH_ALEN);
  			memcpy(mgmt->bssid, req->bssid, ETH_ALEN);
  
  			if (req->ie_len)
  				skb_put_data(probe, 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->survey_data[hwsim->scan_chan_idx].channel = hwsim->tmp_chan;
  	hwsim->survey_data[hwsim->scan_chan_idx].start = jiffies;
  	hwsim->survey_data[hwsim->scan_chan_idx].end =
  		jiffies + 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 ieee80211_scan_request *hw_req)
  {
  	struct mac80211_hwsim_data *hwsim = hw->priv;
  	struct cfg80211_scan_request *req = &hw_req->req;
  
  	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;
  	if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
  		get_random_mask_addr(hwsim->scan_addr,
  				     hw_req->req.mac_addr,
  				     hw_req->req.mac_addr_mask);
  	else
  		memcpy(hwsim->scan_addr, vif->addr, ETH_ALEN);
  	memset(hwsim->survey_data, 0, sizeof(hwsim->survey_data));
  	mutex_unlock(&hwsim->mutex);
  
  	wiphy_dbg(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;
  	struct cfg80211_scan_info info = {
  		.aborted = true,
  	};
  
  	wiphy_dbg(hw->wiphy, "hwsim cancel_hw_scan\n");
  
  	cancel_delayed_work_sync(&hwsim->hw_scan);
  
  	mutex_lock(&hwsim->mutex);
  	ieee80211_scan_completed(hwsim->hw, &info);
  	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 ieee80211_vif *vif,
  				   const u8 *mac_addr)
  {
  	struct mac80211_hwsim_data *hwsim = hw->priv;
  
  	mutex_lock(&hwsim->mutex);
  
  	if (hwsim->scanning) {
  		pr_debug("two hwsim sw_scans detected!\n");
  		goto out;
  	}
  
  	pr_debug("hwsim sw_scan request, prepping stuff\n");
  
  	memcpy(hwsim->scan_addr, mac_addr, ETH_ALEN);
  	hwsim->scanning = true;
  	memset(hwsim->survey_data, 0, sizeof(hwsim->survey_data));
  
  out:
  	mutex_unlock(&hwsim->mutex);
  }
  
  static void mac80211_hwsim_sw_scan_complete(struct ieee80211_hw *hw,
  					    struct ieee80211_vif *vif)
  {
  	struct mac80211_hwsim_data *hwsim = hw->priv;
  
  	mutex_lock(&hwsim->mutex);
  
  	pr_debug("hwsim sw_scan_complete\n");
  	hwsim->scanning = false;
  	eth_zero_addr(hwsim->scan_addr);
  
  	mutex_unlock(&hwsim->mutex);
  }
  
  static void hw_roc_start(struct work_struct *work)
  {
  	struct mac80211_hwsim_data *hwsim =
  		container_of(work, struct mac80211_hwsim_data, roc_start.work);
  
  	mutex_lock(&hwsim->mutex);
  
  	wiphy_dbg(hwsim->hw->wiphy, "hwsim ROC begins\n");
  	hwsim->tmp_chan = hwsim->roc_chan;
  	ieee80211_ready_on_channel(hwsim->hw);
  
  	ieee80211_queue_delayed_work(hwsim->hw, &hwsim->roc_done,
  				     msecs_to_jiffies(hwsim->roc_duration));
  
  	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_dbg(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->roc_chan = chan;
  	hwsim->roc_duration = duration;
  	mutex_unlock(&hwsim->mutex);
  
  	wiphy_dbg(hw->wiphy, "hwsim ROC (%d MHz, %d ms)\n",
  		  chan->center_freq, duration);
  	ieee80211_queue_delayed_work(hw, &hwsim->roc_start, HZ/50);
  
  	return 0;
  }
  
  static int mac80211_hwsim_croc(struct ieee80211_hw *hw)
  {
  	struct mac80211_hwsim_data *hwsim = hw->priv;
  
  	cancel_delayed_work_sync(&hwsim->roc_start);
  	cancel_delayed_work_sync(&hwsim->roc_done);
  
  	mutex_lock(&hwsim->mutex);
  	hwsim->tmp_chan = NULL;
  	mutex_unlock(&hwsim->mutex);
  
  	wiphy_dbg(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_dbg(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_dbg(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_dbg(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 const char mac80211_hwsim_gstrings_stats[][ETH_GSTRING_LEN] = {
  	"tx_pkts_nic",
  	"tx_bytes_nic",
  	"rx_pkts_nic",
  	"rx_bytes_nic",
  	"d_tx_dropped",
  	"d_tx_failed",
  	"d_ps_mode",
  	"d_group",
  };
  
  #define MAC80211_HWSIM_SSTATS_LEN ARRAY_SIZE(mac80211_hwsim_gstrings_stats)
  
  static void mac80211_hwsim_get_et_strings(struct ieee80211_hw *hw,
  					  struct ieee80211_vif *vif,
  					  u32 sset, u8 *data)
  {
  	if (sset == ETH_SS_STATS)
  		memcpy(data, *mac80211_hwsim_gstrings_stats,
  		       sizeof(mac80211_hwsim_gstrings_stats));
  }
  
  static int mac80211_hwsim_get_et_sset_count(struct ieee80211_hw *hw,
  					    struct ieee80211_vif *vif, int sset)
  {
  	if (sset == ETH_SS_STATS)
  		return MAC80211_HWSIM_SSTATS_LEN;
  	return 0;
  }
  
  static void mac80211_hwsim_get_et_stats(struct ieee80211_hw *hw,
  					struct ieee80211_vif *vif,
  					struct ethtool_stats *stats, u64 *data)
  {
  	struct mac80211_hwsim_data *ar = hw->priv;
  	int i = 0;
  
  	data[i++] = ar->tx_pkts;
  	data[i++] = ar->tx_bytes;
  	data[i++] = ar->rx_pkts;
  	data[i++] = ar->rx_bytes;
  	data[i++] = ar->tx_dropped;
  	data[i++] = ar->tx_failed;
  	data[i++] = ar->ps;
  	data[i++] = ar->group;
  
  	WARN_ON(i != MAC80211_HWSIM_SSTATS_LEN);
  }
  
  #define HWSIM_COMMON_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,		\
  	.flush = mac80211_hwsim_flush,				\
  	.get_tsf = mac80211_hwsim_get_tsf,			\
  	.set_tsf = mac80211_hwsim_set_tsf,			\
  	.get_et_sset_count = mac80211_hwsim_get_et_sset_count,	\
  	.get_et_stats = mac80211_hwsim_get_et_stats,		\
  	.get_et_strings = mac80211_hwsim_get_et_strings,
  
  static const struct ieee80211_ops mac80211_hwsim_ops = {
  	HWSIM_COMMON_OPS
  	.sw_scan_start = mac80211_hwsim_sw_scan,
  	.sw_scan_complete = mac80211_hwsim_sw_scan_complete,
  };
  
  static const struct ieee80211_ops mac80211_hwsim_mchan_ops = {
  	HWSIM_COMMON_OPS
  	.hw_scan = mac80211_hwsim_hw_scan,
  	.cancel_hw_scan = mac80211_hwsim_cancel_hw_scan,
  	.sw_scan_start = NULL,
  	.sw_scan_complete = NULL,
  	.remain_on_channel = mac80211_hwsim_roc,
  	.cancel_remain_on_channel = mac80211_hwsim_croc,
  	.add_chanctx = mac80211_hwsim_add_chanctx,
  	.remove_chanctx = mac80211_hwsim_remove_chanctx,
  	.change_chanctx = mac80211_hwsim_change_chanctx,
  	.assign_vif_chanctx = mac80211_hwsim_assign_vif_chanctx,
  	.unassign_vif_chanctx = mac80211_hwsim_unassign_vif_chanctx,
  };
  
  struct hwsim_new_radio_params {
  	unsigned int channels;
  	const char *reg_alpha2;
  	const struct ieee80211_regdomain *regd;
  	bool reg_strict;
  	bool p2p_device;
  	bool use_chanctx;
  	bool destroy_on_close;
  	const char *hwname;
  	bool no_vif;
  	const u8 *perm_addr;
  };
  
  static void hwsim_mcast_config_msg(struct sk_buff *mcast_skb,
  				   struct genl_info *info)
  {
  	if (info)
  		genl_notify(&hwsim_genl_family, mcast_skb, info,
  			    HWSIM_MCGRP_CONFIG, GFP_KERNEL);
  	else
  		genlmsg_multicast(&hwsim_genl_family, mcast_skb, 0,
  				  HWSIM_MCGRP_CONFIG, GFP_KERNEL);
  }
  
  static int append_radio_msg(struct sk_buff *skb, int id,
  			    struct hwsim_new_radio_params *param)
  {
  	int ret;
  
  	ret = nla_put_u32(skb, HWSIM_ATTR_RADIO_ID, id);
  	if (ret < 0)
  		return ret;
  
  	if (param->channels) {
  		ret = nla_put_u32(skb, HWSIM_ATTR_CHANNELS, param->channels);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (param->reg_alpha2) {
  		ret = nla_put(skb, HWSIM_ATTR_REG_HINT_ALPHA2, 2,
  			      param->reg_alpha2);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (param->regd) {
  		int i;
  
  		for (i = 0; i < ARRAY_SIZE(hwsim_world_regdom_custom); i++) {
  			if (hwsim_world_regdom_custom[i] != param->regd)
  				continue;
  
  			ret = nla_put_u32(skb, HWSIM_ATTR_REG_CUSTOM_REG, i);
  			if (ret < 0)
  				return ret;
  			break;
  		}
  	}
  
  	if (param->reg_strict) {
  		ret = nla_put_flag(skb, HWSIM_ATTR_REG_STRICT_REG);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (param->p2p_device) {
  		ret = nla_put_flag(skb, HWSIM_ATTR_SUPPORT_P2P_DEVICE);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (param->use_chanctx) {
  		ret = nla_put_flag(skb, HWSIM_ATTR_USE_CHANCTX);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (param->hwname) {
  		ret = nla_put(skb, HWSIM_ATTR_RADIO_NAME,
  			      strlen(param->hwname), param->hwname);
  		if (ret < 0)
  			return ret;
  	}
  
  	return 0;
  }
  
  static void hwsim_mcast_new_radio(int id, struct genl_info *info,
  				  struct hwsim_new_radio_params *param)
  {
  	struct sk_buff *mcast_skb;
  	void *data;
  
  	mcast_skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!mcast_skb)
  		return;
  
  	data = genlmsg_put(mcast_skb, 0, 0, &hwsim_genl_family, 0,
  			   HWSIM_CMD_NEW_RADIO);
  	if (!data)
  		goto out_err;
  
  	if (append_radio_msg(mcast_skb, id, param) < 0)
  		goto out_err;
  
  	genlmsg_end(mcast_skb, data);
  
  	hwsim_mcast_config_msg(mcast_skb, info);
  	return;
  
  out_err:
  	nlmsg_free(mcast_skb);
  }
  
  static const struct ieee80211_sband_iftype_data he_capa_2ghz = {
  	/* TODO: should we support other types, e.g., P2P?*/
  	.types_mask = BIT(NL80211_IFTYPE_STATION) | BIT(NL80211_IFTYPE_AP),
  	.he_cap = {
  		.has_he = true,
  		.he_cap_elem = {
  			.mac_cap_info[0] =
  				IEEE80211_HE_MAC_CAP0_HTC_HE,
  			.mac_cap_info[1] =
  				IEEE80211_HE_MAC_CAP1_TF_MAC_PAD_DUR_16US |
  				IEEE80211_HE_MAC_CAP1_MULTI_TID_AGG_QOS_8,
  			.mac_cap_info[2] =
  				IEEE80211_HE_MAC_CAP2_BSR |
  				IEEE80211_HE_MAC_CAP2_MU_CASCADING |
  				IEEE80211_HE_MAC_CAP2_ACK_EN,
  			.mac_cap_info[3] =
  				IEEE80211_HE_MAC_CAP3_GRP_ADDR_MULTI_STA_BA_DL_MU |
  				IEEE80211_HE_MAC_CAP3_OMI_CONTROL |
  				IEEE80211_HE_MAC_CAP3_MAX_A_AMPDU_LEN_EXP_VHT_2,
  			.mac_cap_info[4] = IEEE80211_HE_MAC_CAP4_AMDSU_IN_AMPDU,
  			.phy_cap_info[0] =
  				IEEE80211_HE_PHY_CAP0_DUAL_BAND,
  			.phy_cap_info[1] =
  				IEEE80211_HE_PHY_CAP1_PREAMBLE_PUNC_RX_MASK |
  				IEEE80211_HE_PHY_CAP1_DEVICE_CLASS_A |
  				IEEE80211_HE_PHY_CAP1_LDPC_CODING_IN_PAYLOAD |
  				IEEE80211_HE_PHY_CAP1_MIDAMBLE_RX_MAX_NSTS,
  			.phy_cap_info[2] =
  				IEEE80211_HE_PHY_CAP2_NDP_4x_LTF_AND_3_2US |
  				IEEE80211_HE_PHY_CAP2_STBC_TX_UNDER_80MHZ |
  				IEEE80211_HE_PHY_CAP2_STBC_RX_UNDER_80MHZ |
  				IEEE80211_HE_PHY_CAP2_UL_MU_FULL_MU_MIMO |
  				IEEE80211_HE_PHY_CAP2_UL_MU_PARTIAL_MU_MIMO,
  
  			/* Leave all the other PHY capability bytes unset, as
  			 * DCM, beam forming, RU and PPE threshold information
  			 * are not supported
  			 */
  		},
  		.he_mcs_nss_supp = {
  			.rx_mcs_80 = cpu_to_le16(0xfffa),
  			.tx_mcs_80 = cpu_to_le16(0xfffa),
  			.rx_mcs_160 = cpu_to_le16(0xffff),
  			.tx_mcs_160 = cpu_to_le16(0xffff),
  			.rx_mcs_80p80 = cpu_to_le16(0xffff),
  			.tx_mcs_80p80 = cpu_to_le16(0xffff),
  		},
  	},
  };
  
  static const struct ieee80211_sband_iftype_data he_capa_5ghz = {
  	/* TODO: should we support other types, e.g., P2P?*/
  	.types_mask = BIT(NL80211_IFTYPE_STATION) | BIT(NL80211_IFTYPE_AP),
  	.he_cap = {
  		.has_he = true,
  		.he_cap_elem = {
  			.mac_cap_info[0] =
  				IEEE80211_HE_MAC_CAP0_HTC_HE,
  			.mac_cap_info[1] =
  				IEEE80211_HE_MAC_CAP1_TF_MAC_PAD_DUR_16US |
  				IEEE80211_HE_MAC_CAP1_MULTI_TID_AGG_QOS_8,
  			.mac_cap_info[2] =
  				IEEE80211_HE_MAC_CAP2_BSR |
  				IEEE80211_HE_MAC_CAP2_MU_CASCADING |
  				IEEE80211_HE_MAC_CAP2_ACK_EN,
  			.mac_cap_info[3] =
  				IEEE80211_HE_MAC_CAP3_GRP_ADDR_MULTI_STA_BA_DL_MU |
  				IEEE80211_HE_MAC_CAP3_OMI_CONTROL |
  				IEEE80211_HE_MAC_CAP3_MAX_A_AMPDU_LEN_EXP_VHT_2,
  			.mac_cap_info[4] = IEEE80211_HE_MAC_CAP4_AMDSU_IN_AMPDU,
  			.phy_cap_info[0] =
  				IEEE80211_HE_PHY_CAP0_DUAL_BAND |
  				IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G |
  				IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G |
  				IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G,
  			.phy_cap_info[1] =
  				IEEE80211_HE_PHY_CAP1_PREAMBLE_PUNC_RX_MASK |
  				IEEE80211_HE_PHY_CAP1_DEVICE_CLASS_A |
  				IEEE80211_HE_PHY_CAP1_LDPC_CODING_IN_PAYLOAD |
  				IEEE80211_HE_PHY_CAP1_MIDAMBLE_RX_MAX_NSTS,
  			.phy_cap_info[2] =
  				IEEE80211_HE_PHY_CAP2_NDP_4x_LTF_AND_3_2US |
  				IEEE80211_HE_PHY_CAP2_STBC_TX_UNDER_80MHZ |
  				IEEE80211_HE_PHY_CAP2_STBC_RX_UNDER_80MHZ |
  				IEEE80211_HE_PHY_CAP2_UL_MU_FULL_MU_MIMO |
  				IEEE80211_HE_PHY_CAP2_UL_MU_PARTIAL_MU_MIMO,
  
  			/* Leave all the other PHY capability bytes unset, as
  			 * DCM, beam forming, RU and PPE threshold information
  			 * are not supported
  			 */
  		},
  		.he_mcs_nss_supp = {
  			.rx_mcs_80 = cpu_to_le16(0xfffa),
  			.tx_mcs_80 = cpu_to_le16(0xfffa),
  			.rx_mcs_160 = cpu_to_le16(0xfffa),
  			.tx_mcs_160 = cpu_to_le16(0xfffa),
  			.rx_mcs_80p80 = cpu_to_le16(0xfffa),
  			.tx_mcs_80p80 = cpu_to_le16(0xfffa),
  		},
  	},
  };
  
  static void mac80211_hswim_he_capab(struct ieee80211_supported_band *sband)
  {
  	if (sband->band == NL80211_BAND_2GHZ)
  		sband->iftype_data =
  			(struct ieee80211_sband_iftype_data *)&he_capa_2ghz;
  	else if (sband->band == NL80211_BAND_5GHZ)
  		sband->iftype_data =
  			(struct ieee80211_sband_iftype_data *)&he_capa_5ghz;
  	else
  		return;
  
  	sband->n_iftype_data = 1;
  }
  
  static int mac80211_hwsim_new_radio(struct genl_info *info,
  				    struct hwsim_new_radio_params *param)
  {
  	int err;
  	u8 addr[ETH_ALEN];
  	struct mac80211_hwsim_data *data;
  	struct ieee80211_hw *hw;
  	enum nl80211_band band;
  	const struct ieee80211_ops *ops = &mac80211_hwsim_ops;
  	struct net *net;
  	int idx;
  
  	if (WARN_ON(param->channels > 1 && !param->use_chanctx))
  		return -EINVAL;
  
  	spin_lock_bh(&hwsim_radio_lock);
  	idx = hwsim_radio_idx++;
  	spin_unlock_bh(&hwsim_radio_lock);
  
  	if (param->use_chanctx)
  		ops = &mac80211_hwsim_mchan_ops;
  	hw = ieee80211_alloc_hw_nm(sizeof(*data), ops, param->hwname);
  	if (!hw) {
  		pr_debug("mac80211_hwsim: ieee80211_alloc_hw failed\n");
  		err = -ENOMEM;
  		goto failed;
  	}
  
  	/* ieee80211_alloc_hw_nm may have used a default name */
  	param->hwname = wiphy_name(hw->wiphy);
  
  	if (info)
  		net = genl_info_net(info);
  	else
  		net = &init_net;
  	wiphy_net_set(hw->wiphy, net);
  
  	data = hw->priv;
  	data->hw = hw;
  
  	data->dev = device_create(hwsim_class, NULL, 0, hw, "hwsim%d", idx);
  	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) {
  		pr_debug("mac80211_hwsim: device_bind_driver failed (%d)\n",
  		       err);
  		goto failed_bind;
  	}
  
  	skb_queue_head_init(&data->pending);
  
  	SET_IEEE80211_DEV(hw, data->dev);
  	if (!param->perm_addr) {
  		eth_zero_addr(addr);
  		addr[0] = 0x02;
  		addr[3] = idx >> 8;
  		addr[4] = idx;
  		memcpy(data->addresses[0].addr, addr, ETH_ALEN);
  		/* Why need here second address ? */
  		memcpy(data->addresses[1].addr, addr, ETH_ALEN);
  		data->addresses[1].addr[0] |= 0x40;
  		hw->wiphy->n_addresses = 2;
  		hw->wiphy->addresses = data->addresses;
  		/* possible address clash is checked at hash table insertion */
  	} else {
  		memcpy(data->addresses[0].addr, param->perm_addr, ETH_ALEN);
  		/* compatibility with automatically generated mac addr */
  		memcpy(data->addresses[1].addr, param->perm_addr, ETH_ALEN);
  		hw->wiphy->n_addresses = 2;
  		hw->wiphy->addresses = data->addresses;
  	}
  
  	data->channels = param->channels;
  	data->use_chanctx = param->use_chanctx;
  	data->idx = idx;
  	data->destroy_on_close = param->destroy_on_close;
  	if (info)
  		data->portid = info->snd_portid;
  
  	if (data->use_chanctx) {
  		hw->wiphy->max_scan_ssids = 255;
  		hw->wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
  		hw->wiphy->max_remain_on_channel_duration = 1000;
  		hw->wiphy->iface_combinations = &data->if_combination;
  		if (param->p2p_device)
  			data->if_combination = hwsim_if_comb_p2p_dev[0];
  		else
  			data->if_combination = hwsim_if_comb[0];
  		hw->wiphy->n_iface_combinations = 1;
  		/* For channels > 1 DFS is not allowed */
  		data->if_combination.radar_detect_widths = 0;
  		data->if_combination.num_different_channels = data->channels;
  	} else if (param->p2p_device) {
  		hw->wiphy->iface_combinations = hwsim_if_comb_p2p_dev;
  		hw->wiphy->n_iface_combinations =
  			ARRAY_SIZE(hwsim_if_comb_p2p_dev);
  	} else {
  		hw->wiphy->iface_combinations = hwsim_if_comb;
  		hw->wiphy->n_iface_combinations = ARRAY_SIZE(hwsim_if_comb);
  	}
  
  	INIT_DELAYED_WORK(&data->roc_start, hw_roc_start);
  	INIT_DELAYED_WORK(&data->roc_done, hw_roc_done);
  	INIT_DELAYED_WORK(&data->hw_scan, hw_scan_work);
  
  	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);
  
  	if (param->p2p_device)
  		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_P2P_DEVICE);
  
  	ieee80211_hw_set(hw, SUPPORT_FAST_XMIT);
  	ieee80211_hw_set(hw, CHANCTX_STA_CSA);
  	ieee80211_hw_set(hw, SUPPORTS_HT_CCK_RATES);
  	ieee80211_hw_set(hw, QUEUE_CONTROL);
  	ieee80211_hw_set(hw, WANT_MONITOR_VIF);
  	ieee80211_hw_set(hw, AMPDU_AGGREGATION);
  	ieee80211_hw_set(hw, MFP_CAPABLE);
  	ieee80211_hw_set(hw, SIGNAL_DBM);
  	ieee80211_hw_set(hw, SUPPORTS_PS);
  	ieee80211_hw_set(hw, TDLS_WIDER_BW);
  	if (rctbl)
  		ieee80211_hw_set(hw, SUPPORTS_RC_TABLE);
  
  	hw->wiphy->flags |= WIPHY_FLAG_SUPPORTS_TDLS |
  			    WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL |
  			    WIPHY_FLAG_AP_UAPSD |
  			    WIPHY_FLAG_HAS_CHANNEL_SWITCH;
  	hw->wiphy->features |= NL80211_FEATURE_ACTIVE_MONITOR |
  			       NL80211_FEATURE_AP_MODE_CHAN_WIDTH_CHANGE |
  			       NL80211_FEATURE_STATIC_SMPS |
  			       NL80211_FEATURE_DYNAMIC_SMPS |
  			       NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR;
  	wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_VHT_IBSS);
  
  	/* 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 = NL80211_BAND_2GHZ; band < NUM_NL80211_BANDS; band++) {
  		struct ieee80211_supported_band *sband = &data->bands[band];
  
  		sband->band = band;
  
  		switch (band) {
  		case NL80211_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 NL80211_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;
  
  			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_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_9 << 0 |
  					    IEEE80211_VHT_MCS_SUPPORT_0_9 << 2 |
  					    IEEE80211_VHT_MCS_SUPPORT_0_9 << 4 |
  					    IEEE80211_VHT_MCS_SUPPORT_0_9 << 6 |
  					    IEEE80211_VHT_MCS_SUPPORT_0_9 << 8 |
  					    IEEE80211_VHT_MCS_SUPPORT_0_9 << 10 |
  					    IEEE80211_VHT_MCS_SUPPORT_0_9 << 12 |
  					    IEEE80211_VHT_MCS_SUPPORT_0_9 << 14);
  			sband->vht_cap.vht_mcs.tx_mcs_map =
  				sband->vht_cap.vht_mcs.rx_mcs_map;
  			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_20 |
  				    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;
  
  		mac80211_hswim_he_capab(sband);
  
  		hw->wiphy->bands[band] = sband;
  	}
  
  	/* By default all radios belong to the first group */
  	data->group = 1;
  	mutex_init(&data->mutex);
  
  	data->netgroup = hwsim_net_get_netgroup(net);
  	data->wmediumd = hwsim_net_get_wmediumd(net);
  
  	/* Enable frame retransmissions for lossy channels */
  	hw->max_rates = 4;
  	hw->max_rate_tries = 11;
  
  	hw->wiphy->vendor_commands = mac80211_hwsim_vendor_commands;
  	hw->wiphy->n_vendor_commands =
  		ARRAY_SIZE(mac80211_hwsim_vendor_commands);
  	hw->wiphy->vendor_events = mac80211_hwsim_vendor_events;
  	hw->wiphy->n_vendor_events = ARRAY_SIZE(mac80211_hwsim_vendor_events);
  
  	if (param->reg_strict)
  		hw->wiphy->regulatory_flags |= REGULATORY_STRICT_REG;
  	if (param->regd) {
  		data->regd = param->regd;
  		hw->wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
  		wiphy_apply_custom_regulatory(hw->wiphy, param->regd);
  		/* give the regulatory workqueue a chance to run */
  		schedule_timeout_interruptible(1);
  	}
  
  	if (param->no_vif)
  		ieee80211_hw_set(hw, NO_AUTO_VIF);
  
  	wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
  
  	tasklet_hrtimer_init(&data->beacon_timer,
  			     mac80211_hwsim_beacon,
  			     CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
  
  	err = ieee80211_register_hw(hw);
  	if (err < 0) {
  		pr_debug("mac80211_hwsim: ieee80211_register_hw failed (%d)\n",
  		       err);
  		goto failed_hw;
  	}
  
  	wiphy_dbg(hw->wiphy, "hwaddr %pM registered\n", hw->wiphy->perm_addr);
  
  	if (param->reg_alpha2) {
  		data->alpha2[0] = param->reg_alpha2[0];
  		data->alpha2[1] = param->reg_alpha2[1];
  		regulatory_hint(hw->wiphy, param->reg_alpha2);
  	}
  
  	data->debugfs = debugfs_create_dir("hwsim", hw->wiphy->debugfsdir);
  	debugfs_create_file("ps", 0666, data->debugfs, data, &hwsim_fops_ps);
  	debugfs_create_file("group", 0666, data->debugfs, data,
  			    &hwsim_fops_group);
  	if (!data->use_chanctx)
  		debugfs_create_file("dfs_simulate_radar", 0222,
  				    data->debugfs,
  				    data, &hwsim_simulate_radar);
  
  	spin_lock_bh(&hwsim_radio_lock);
  	err = rhashtable_insert_fast(&hwsim_radios_rht, &data->rht,
  				     hwsim_rht_params);
  	if (err < 0) {
  		if (info) {
  			GENL_SET_ERR_MSG(info, "perm addr already present");
  			NL_SET_BAD_ATTR(info->extack,
  					info->attrs[HWSIM_ATTR_PERM_ADDR]);
  		}
  		spin_unlock_bh(&hwsim_radio_lock);
  		goto failed_final_insert;
  	}
  
  	list_add_tail(&data->list, &hwsim_radios);
  	hwsim_radios_generation++;
  	spin_unlock_bh(&hwsim_radio_lock);
  
  	hwsim_mcast_new_radio(idx, info, param);
  
  	return idx;
  
  failed_final_insert:
  	debugfs_remove_recursive(data->debugfs);
  	ieee80211_unregister_hw(data->hw);
  failed_hw:
  	device_release_driver(data->dev);
  failed_bind:
  	device_unregister(data->dev);
  failed_drvdata:
  	ieee80211_free_hw(hw);
  failed:
  	return err;
  }
  
  static void hwsim_mcast_del_radio(int id, const char *hwname,
  				  struct genl_info *info)
  {
  	struct sk_buff *skb;
  	void *data;
  	int ret;
  
  	skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!skb)
  		return;
  
  	data = genlmsg_put(skb, 0, 0, &hwsim_genl_family, 0,
  			   HWSIM_CMD_DEL_RADIO);
  	if (!data)
  		goto error;
  
  	ret = nla_put_u32(skb, HWSIM_ATTR_RADIO_ID, id);
  	if (ret < 0)
  		goto error;
  
  	ret = nla_put(skb, HWSIM_ATTR_RADIO_NAME, strlen(hwname),
  		      hwname);
  	if (ret < 0)
  		goto error;
  
  	genlmsg_end(skb, data);
  
  	hwsim_mcast_config_msg(skb, info);
  
  	return;
  
  error:
  	nlmsg_free(skb);
  }
  
  static void mac80211_hwsim_del_radio(struct mac80211_hwsim_data *data,
  				     const char *hwname,
  				     struct genl_info *info)
  {
  	hwsim_mcast_del_radio(data->idx, hwname, info);
  	debugfs_remove_recursive(data->debugfs);
  	ieee80211_unregister_hw(data->hw);
  	device_release_driver(data->dev);
  	device_unregister(data->dev);
  	ieee80211_free_hw(data->hw);
  }
  
  static int mac80211_hwsim_get_radio(struct sk_buff *skb,
  				    struct mac80211_hwsim_data *data,
  				    u32 portid, u32 seq,
  				    struct netlink_callback *cb, int flags)
  {
  	void *hdr;
  	struct hwsim_new_radio_params param = { };
  	int res = -EMSGSIZE;
  
  	hdr = genlmsg_put(skb, portid, seq, &hwsim_genl_family, flags,
  			  HWSIM_CMD_GET_RADIO);
  	if (!hdr)
  		return -EMSGSIZE;
  
  	if (cb)
  		genl_dump_check_consistent(cb, hdr);
  
  	if (data->alpha2[0] && data->alpha2[1])
  		param.reg_alpha2 = data->alpha2;
  
  	param.reg_strict = !!(data->hw->wiphy->regulatory_flags &
  					REGULATORY_STRICT_REG);
  	param.p2p_device = !!(data->hw->wiphy->interface_modes &
  					BIT(NL80211_IFTYPE_P2P_DEVICE));
  	param.use_chanctx = data->use_chanctx;
  	param.regd = data->regd;
  	param.channels = data->channels;
  	param.hwname = wiphy_name(data->hw->wiphy);
  
  	res = append_radio_msg(skb, data->idx, &param);
  	if (res < 0)
  		goto out_err;
  
  	genlmsg_end(skb, hdr);
  	return 0;
  
  out_err:
  	genlmsg_cancel(skb, hdr);
  	return res;
  }
  
  static void mac80211_hwsim_free(void)
  {
  	struct mac80211_hwsim_data *data;
  
  	spin_lock_bh(&hwsim_radio_lock);
  	while ((data = list_first_entry_or_null(&hwsim_radios,
  						struct mac80211_hwsim_data,
  						list))) {
  		list_del(&data->list);
  		spin_unlock_bh(&hwsim_radio_lock);
  		mac80211_hwsim_del_radio(data, wiphy_name(data->hw->wiphy),
  					 NULL);
  		spin_lock_bh(&hwsim_radio_lock);
  	}
  	spin_unlock_bh(&hwsim_radio_lock);
  	class_destroy(hwsim_class);
  }
  
  static const struct net_device_ops hwsim_netdev_ops = {
  	.ndo_start_xmit 	= hwsim_mon_xmit,
  	.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->needs_free_netdev = true;
  	ether_setup(dev);
  	dev->priv_flags |= IFF_NO_QUEUE;
  	dev->type = ARPHRD_IEEE80211_RADIOTAP;
  	eth_zero_addr(dev->dev_addr);
  	dev->dev_addr[0] = 0x12;
  }
  
  static struct mac80211_hwsim_data *get_hwsim_data_ref_from_addr(const u8 *addr)
  {
  	return rhashtable_lookup_fast(&hwsim_radios_rht,
  				      addr,
  				      hwsim_rht_params);
  }
  
  static void hwsim_register_wmediumd(struct net *net, u32 portid)
  {
  	struct mac80211_hwsim_data *data;
  
  	hwsim_net_set_wmediumd(net, portid);
  
  	spin_lock_bh(&hwsim_radio_lock);
  	list_for_each_entry(data, &hwsim_radios, list) {
  		if (data->netgroup == hwsim_net_get_netgroup(net))
  			data->wmediumd = portid;
  	}
  	spin_unlock_bh(&hwsim_radio_lock);
  }
  
  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;
  	u64 ret_skb_cookie;
  	struct sk_buff *skb, *tmp;
  	const u8 *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_SIGNAL] ||
  	    !info->attrs[HWSIM_ATTR_TX_INFO])
  		goto out;
  
  	src = (void *)nla_data(info->attrs[HWSIM_ATTR_ADDR_TRANSMITTER]);
  	hwsim_flags = nla_get_u32(info->attrs[HWSIM_ATTR_FLAGS]);
  	ret_skb_cookie = nla_get_u64(info->attrs[HWSIM_ATTR_COOKIE]);
  
  	data2 = get_hwsim_data_ref_from_addr(src);
  	if (!data2)
  		goto out;
  
  	if (hwsim_net_get_netgroup(genl_info_net(info)) != data2->netgroup)
  		goto out;
  
  	if (info->snd_portid != data2->wmediumd)
  		goto out;
  
  	/* look for the skb matching the cookie passed back from user */
  	skb_queue_walk_safe(&data2->pending, skb, tmp) {
  		u64 skb_cookie;
  
  		txi = IEEE80211_SKB_CB(skb);
  		skb_cookie = (u64)(uintptr_t)txi->rate_driver_data[0];
  
  		if (skb_cookie == ret_skb_cookie) {
  			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.ack_signal = nla_get_u32(info->attrs[HWSIM_ATTR_SIGNAL]);
  
  	if (!(hwsim_flags & HWSIM_TX_CTL_NO_ACK) &&
  	   (hwsim_flags & HWSIM_TX_STAT_ACK)) {
  		if (skb->len >= 16) {
  			hdr = (struct ieee80211_hdr *) skb->data;
  			mac80211_hwsim_monitor_ack(data2->channel,
  						   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;
  	const u8 *dst;
  	int frame_data_len;
  	void *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 = (void *)nla_data(info->attrs[HWSIM_ATTR_ADDR_RECEIVER]);
  	frame_data_len = nla_len(info->attrs[HWSIM_ATTR_FRAME]);
  	frame_data = (void *)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)
  		goto err;
  
  	/* Copy the data */
  	skb_put_data(skb, frame_data, frame_data_len);
  
  	data2 = get_hwsim_data_ref_from_addr(dst);
  	if (!data2)
  		goto out;
  
  	if (hwsim_net_get_netgroup(genl_info_net(info)) != data2->netgroup)
  		goto out;
  
  	if (info->snd_portid != data2->wmediumd)
  		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));
  	if (info->attrs[HWSIM_ATTR_FREQ]) {
  		/* throw away off-channel packets, but allow both the temporary
  		 * ("hw" scan/remain-on-channel) and regular channel, since the
  		 * internal datapath also allows this
  		 */
  		mutex_lock(&data2->mutex);
  		rx_status.freq = nla_get_u32(info->attrs[HWSIM_ATTR_FREQ]);
  
  		if (rx_status.freq != data2->channel->center_freq &&
  		    (!data2->tmp_chan ||
  		     rx_status.freq != data2->tmp_chan->center_freq)) {
  			mutex_unlock(&data2->mutex);
  			goto out;
  		}
  		mutex_unlock(&data2->mutex);
  	} else {
  		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));
  	data2->rx_pkts++;
  	data2->rx_bytes += skb->len;
  	ieee80211_rx_irqsafe(data2->hw, skb);
  
  	return 0;
  err:
  	pr_debug("mac80211_hwsim: error occurred in %s\n", __func__);
  out:
  	dev_kfree_skb(skb);
  	return -EINVAL;
  }
  
  static int hwsim_register_received_nl(struct sk_buff *skb_2,
  				      struct genl_info *info)
  {
  	struct net *net = genl_info_net(info);
  	struct mac80211_hwsim_data *data;
  	int chans = 1;
  
  	spin_lock_bh(&hwsim_radio_lock);
  	list_for_each_entry(data, &hwsim_radios, list)
  		chans = max(chans, data->channels);
  	spin_unlock_bh(&hwsim_radio_lock);
  
  	/* In the future we should revise the userspace API and allow it
  	 * to set a flag that it does support multi-channel, then we can
  	 * let this pass conditionally on the flag.
  	 * For current userspace, prohibit it since it won't work right.
  	 */
  	if (chans > 1)
  		return -EOPNOTSUPP;
  
  	if (hwsim_net_get_wmediumd(net))
  		return -EBUSY;
  
  	hwsim_register_wmediumd(net, info->snd_portid);
  
  	pr_debug("mac80211_hwsim: received a REGISTER, "
  	       "switching to wmediumd mode with pid %d\n", info->snd_portid);
  
  	return 0;
  }
  
  static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
  {
  	struct hwsim_new_radio_params param = { 0 };
  	const char *hwname = NULL;
  	int ret;
  
  	param.reg_strict = info->attrs[HWSIM_ATTR_REG_STRICT_REG];
  	param.p2p_device = info->attrs[HWSIM_ATTR_SUPPORT_P2P_DEVICE];
  	param.channels = channels;
  	param.destroy_on_close =
  		info->attrs[HWSIM_ATTR_DESTROY_RADIO_ON_CLOSE];
  
  	if (info->attrs[HWSIM_ATTR_CHANNELS])
  		param.channels = nla_get_u32(info->attrs[HWSIM_ATTR_CHANNELS]);
  
  	if (param.channels < 1) {
  		GENL_SET_ERR_MSG(info, "must have at least one channel");
  		return -EINVAL;
  	}
  
  	if (param.channels > CFG80211_MAX_NUM_DIFFERENT_CHANNELS) {
  		GENL_SET_ERR_MSG(info, "too many channels specified");
  		return -EINVAL;
  	}
  
  	if (info->attrs[HWSIM_ATTR_NO_VIF])
  		param.no_vif = true;
  
  	if (info->attrs[HWSIM_ATTR_RADIO_NAME]) {
  		hwname = kstrndup((char *)nla_data(info->attrs[HWSIM_ATTR_RADIO_NAME]),
  				  nla_len(info->attrs[HWSIM_ATTR_RADIO_NAME]),
  				  GFP_KERNEL);
  		if (!hwname)
  			return -ENOMEM;
  		param.hwname = hwname;
  	}
  
  	if (info->attrs[HWSIM_ATTR_USE_CHANCTX])
  		param.use_chanctx = true;
  	else
  		param.use_chanctx = (param.channels > 1);
  
  	if (info->attrs[HWSIM_ATTR_REG_HINT_ALPHA2])
  		param.reg_alpha2 =
  			nla_data(info->attrs[HWSIM_ATTR_REG_HINT_ALPHA2]);
  
  	if (info->attrs[HWSIM_ATTR_REG_CUSTOM_REG]) {
  		u32 idx = nla_get_u32(info->attrs[HWSIM_ATTR_REG_CUSTOM_REG]);
  
  		if (idx >= ARRAY_SIZE(hwsim_world_regdom_custom)) {
  			kfree(hwname);
  			return -EINVAL;
  		}
  
  		idx = array_index_nospec(idx,
  					 ARRAY_SIZE(hwsim_world_regdom_custom));
  		param.regd = hwsim_world_regdom_custom[idx];
  	}
  
  	if (info->attrs[HWSIM_ATTR_PERM_ADDR]) {
  		if (!is_valid_ether_addr(
  				nla_data(info->attrs[HWSIM_ATTR_PERM_ADDR]))) {
  			GENL_SET_ERR_MSG(info,"MAC is no valid source addr");
  			NL_SET_BAD_ATTR(info->extack,
  					info->attrs[HWSIM_ATTR_PERM_ADDR]);
  			kfree(hwname);
  			return -EINVAL;
  		}
  
  
  		param.perm_addr = nla_data(info->attrs[HWSIM_ATTR_PERM_ADDR]);
  	}
  
  	ret = mac80211_hwsim_new_radio(info, &param);
  	kfree(hwname);
  	return ret;
  }
  
  static int hwsim_del_radio_nl(struct sk_buff *msg, struct genl_info *info)
  {
  	struct mac80211_hwsim_data *data;
  	s64 idx = -1;
  	const char *hwname = NULL;
  
  	if (info->attrs[HWSIM_ATTR_RADIO_ID]) {
  		idx = nla_get_u32(info->attrs[HWSIM_ATTR_RADIO_ID]);
  	} else if (info->attrs[HWSIM_ATTR_RADIO_NAME]) {
  		hwname = kstrndup((char *)nla_data(info->attrs[HWSIM_ATTR_RADIO_NAME]),
  				  nla_len(info->attrs[HWSIM_ATTR_RADIO_NAME]),
  				  GFP_KERNEL);
  		if (!hwname)
  			return -ENOMEM;
  	} else
  		return -EINVAL;
  
  	spin_lock_bh(&hwsim_radio_lock);
  	list_for_each_entry(data, &hwsim_radios, list) {
  		if (idx >= 0) {
  			if (data->idx != idx)
  				continue;
  		} else {
  			if (!hwname ||
  			    strcmp(hwname, wiphy_name(data->hw->wiphy)))
  				continue;
  		}
  
  		if (!net_eq(wiphy_net(data->hw->wiphy), genl_info_net(info)))
  			continue;
  
  		list_del(&data->list);
  		rhashtable_remove_fast(&hwsim_radios_rht, &data->rht,
  				       hwsim_rht_params);
  		hwsim_radios_generation++;
  		spin_unlock_bh(&hwsim_radio_lock);
  		mac80211_hwsim_del_radio(data, wiphy_name(data->hw->wiphy),
  					 info);
  		kfree(hwname);
  		return 0;
  	}
  	spin_unlock_bh(&hwsim_radio_lock);
  
  	kfree(hwname);
  	return -ENODEV;
  }
  
  static int hwsim_get_radio_nl(struct sk_buff *msg, struct genl_info *info)
  {
  	struct mac80211_hwsim_data *data;
  	struct sk_buff *skb;
  	int idx, res = -ENODEV;
  
  	if (!info->attrs[HWSIM_ATTR_RADIO_ID])
  		return -EINVAL;
  	idx = nla_get_u32(info->attrs[HWSIM_ATTR_RADIO_ID]);
  
  	spin_lock_bh(&hwsim_radio_lock);
  	list_for_each_entry(data, &hwsim_radios, list) {
  		if (data->idx != idx)
  			continue;
  
  		if (!net_eq(wiphy_net(data->hw->wiphy), genl_info_net(info)))
  			continue;
  
  		skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
  		if (!skb) {
  			res = -ENOMEM;
  			goto out_err;
  		}
  
  		res = mac80211_hwsim_get_radio(skb, data, info->snd_portid,
  					       info->snd_seq, NULL, 0);
  		if (res < 0) {
  			nlmsg_free(skb);
  			goto out_err;
  		}
  
  		res = genlmsg_reply(skb, info);
  		break;
  	}
  
  out_err:
  	spin_unlock_bh(&hwsim_radio_lock);
  
  	return res;
  }
  
  static int hwsim_dump_radio_nl(struct sk_buff *skb,
  			       struct netlink_callback *cb)
  {
  	int last_idx = cb->args[0] - 1;
  	struct mac80211_hwsim_data *data = NULL;
  	int res = 0;
  	void *hdr;
  
  	spin_lock_bh(&hwsim_radio_lock);
  	cb->seq = hwsim_radios_generation;
  
  	if (last_idx >= hwsim_radio_idx-1)
  		goto done;
  
  	list_for_each_entry(data, &hwsim_radios, list) {
  		if (data->idx <= last_idx)
  			continue;
  
  		if (!net_eq(wiphy_net(data->hw->wiphy), sock_net(skb->sk)))
  			continue;
  
  		res = mac80211_hwsim_get_radio(skb, data,
  					       NETLINK_CB(cb->skb).portid,
  					       cb->nlh->nlmsg_seq, cb,
  					       NLM_F_MULTI);
  		if (res < 0)
  			break;
  
  		last_idx = data->idx;
  	}
  
  	cb->args[0] = last_idx + 1;
  
  	/* list changed, but no new element sent, set interrupted flag */
  	if (skb->len == 0 && cb->prev_seq && cb->seq != cb->prev_seq) {
  		hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
  				  cb->nlh->nlmsg_seq, &hwsim_genl_family,
  				  NLM_F_MULTI, HWSIM_CMD_GET_RADIO);
  		if (hdr) {
  			genl_dump_check_consistent(cb, hdr);
  			genlmsg_end(skb, hdr);
  		} else {
  			res = -EMSGSIZE;
  		}
  	}
  
  done:
  	spin_unlock_bh(&hwsim_radio_lock);
  	return res ?: skb->len;
  }
  
  /* Generic Netlink operations array */
  static const struct genl_ops hwsim_ops[] = {
  	{
  		.cmd = HWSIM_CMD_REGISTER,
  		.policy = hwsim_genl_policy,
  		.doit = hwsim_register_received_nl,
  		.flags = GENL_UNS_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,
  	},
  	{
  		.cmd = HWSIM_CMD_NEW_RADIO,
  		.policy = hwsim_genl_policy,
  		.doit = hwsim_new_radio_nl,
  		.flags = GENL_UNS_ADMIN_PERM,
  	},
  	{
  		.cmd = HWSIM_CMD_DEL_RADIO,
  		.policy = hwsim_genl_policy,
  		.doit = hwsim_del_radio_nl,
  		.flags = GENL_UNS_ADMIN_PERM,
  	},
  	{
  		.cmd = HWSIM_CMD_GET_RADIO,
  		.policy = hwsim_genl_policy,
  		.doit = hwsim_get_radio_nl,
  		.dumpit = hwsim_dump_radio_nl,
  	},
  };
  
  static struct genl_family hwsim_genl_family __ro_after_init = {
  	.name = "MAC80211_HWSIM",
  	.version = 1,
  	.maxattr = HWSIM_ATTR_MAX,
  	.netnsok = true,
  	.module = THIS_MODULE,
  	.ops = hwsim_ops,
  	.n_ops = ARRAY_SIZE(hwsim_ops),
  	.mcgrps = hwsim_mcgrps,
  	.n_mcgrps = ARRAY_SIZE(hwsim_mcgrps),
  };
  
  static void remove_user_radios(u32 portid)
  {
  	struct mac80211_hwsim_data *entry, *tmp;
  	LIST_HEAD(list);
  
  	spin_lock_bh(&hwsim_radio_lock);
  	list_for_each_entry_safe(entry, tmp, &hwsim_radios, list) {
  		if (entry->destroy_on_close && entry->portid == portid) {
  			list_move(&entry->list, &list);
  			rhashtable_remove_fast(&hwsim_radios_rht, &entry->rht,
  					       hwsim_rht_params);
  			hwsim_radios_generation++;
  		}
  	}
  	spin_unlock_bh(&hwsim_radio_lock);
  
  	list_for_each_entry_safe(entry, tmp, &list, list) {
  		list_del(&entry->list);
  		mac80211_hwsim_del_radio(entry, wiphy_name(entry->hw->wiphy),
  					 NULL);
  	}
  }
  
  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;
  
  	remove_user_radios(notify->portid);
  
  	if (notify->portid == hwsim_net_get_wmediumd(notify->net)) {
  		printk(KERN_INFO "mac80211_hwsim: wmediumd released netlink"
  		       " socket, switching to perfect channel medium\n");
  		hwsim_register_wmediumd(notify->net, 0);
  	}
  	return NOTIFY_DONE;
  
  }
  
  static struct notifier_block hwsim_netlink_notifier = {
  	.notifier_call = mac80211_hwsim_netlink_notify,
  };
  
  static int __init hwsim_init_netlink(void)
  {
  	int rc;
  
  	printk(KERN_INFO "mac80211_hwsim: initializing netlink\n");
  
  	rc = genl_register_family(&hwsim_genl_family);
  	if (rc)
  		goto failure;
  
  	rc = netlink_register_notifier(&hwsim_netlink_notifier);
  	if (rc) {
  		genl_unregister_family(&hwsim_genl_family);
  		goto failure;
  	}
  
  	return 0;
  
  failure:
  	pr_debug("mac80211_hwsim: error occurred in %s\n", __func__);
  	return -EINVAL;
  }
  
  static __net_init int hwsim_init_net(struct net *net)
  {
  	return hwsim_net_set_netgroup(net);
  }
  
  static void __net_exit hwsim_exit_net(struct net *net)
  {
  	struct mac80211_hwsim_data *data, *tmp;
  	LIST_HEAD(list);
  
  	spin_lock_bh(&hwsim_radio_lock);
  	list_for_each_entry_safe(data, tmp, &hwsim_radios, list) {
  		if (!net_eq(wiphy_net(data->hw->wiphy), net))
  			continue;
  
  		/* Radios created in init_net are returned to init_net. */
  		if (data->netgroup == hwsim_net_get_netgroup(&init_net))
  			continue;
  
  		list_move(&data->list, &list);
  		rhashtable_remove_fast(&hwsim_radios_rht, &data->rht,
  				       hwsim_rht_params);
  		hwsim_radios_generation++;
  	}
  	spin_unlock_bh(&hwsim_radio_lock);
  
  	list_for_each_entry_safe(data, tmp, &list, list) {
  		list_del(&data->list);
  		mac80211_hwsim_del_radio(data,
  					 wiphy_name(data->hw->wiphy),
  					 NULL);
  	}
  
  	ida_simple_remove(&hwsim_netgroup_ida, hwsim_net_get_netgroup(net));
  }
  
  static struct pernet_operations hwsim_net_ops = {
  	.init = hwsim_init_net,
  	.exit = hwsim_exit_net,
  	.id   = &hwsim_net_id,
  	.size = sizeof(struct hwsim_net),
  };
  
  static void hwsim_exit_netlink(void)
  {
  	/* unregister the notifier */
  	netlink_unregister_notifier(&hwsim_netlink_notifier);
  	/* unregister the family */
  	genl_unregister_family(&hwsim_genl_family);
  }
  
  static int __init init_mac80211_hwsim(void)
  {
  	int i, err;
  
  	if (radios < 0 || radios > 100)
  		return -EINVAL;
  
  	if (channels < 1)
  		return -EINVAL;
  
  	spin_lock_init(&hwsim_radio_lock);
  
  	hwsim_wq = alloc_workqueue("hwsim_wq", 0, 0);
  	if (!hwsim_wq)
  		return -ENOMEM;
  
  	err = rhashtable_init(&hwsim_radios_rht, &hwsim_rht_params);
  	if (err)
  		goto out_free_wq;
  
  	err = register_pernet_device(&hwsim_net_ops);
  	if (err)
  		goto out_free_rht;
  
  	err = platform_driver_register(&mac80211_hwsim_driver);
  	if (err)
  		goto out_unregister_pernet;
  
  	err = hwsim_init_netlink();
  	if (err)
  		goto out_unregister_driver;
  
  	hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
  	if (IS_ERR(hwsim_class)) {
  		err = PTR_ERR(hwsim_class);
  		goto out_exit_netlink;
  	}
  
  	for (i = 0; i < radios; i++) {
  		struct hwsim_new_radio_params param = { 0 };
  
  		param.channels = channels;
  
  		switch (regtest) {
  		case HWSIM_REGTEST_DIFF_COUNTRY:
  			if (i < ARRAY_SIZE(hwsim_alpha2s))
  				param.reg_alpha2 = hwsim_alpha2s[i];
  			break;
  		case HWSIM_REGTEST_DRIVER_REG_FOLLOW:
  			if (!i)
  				param.reg_alpha2 = hwsim_alpha2s[0];
  			break;
  		case HWSIM_REGTEST_STRICT_ALL:
  			param.reg_strict = true;
  		case HWSIM_REGTEST_DRIVER_REG_ALL:
  			param.reg_alpha2 = hwsim_alpha2s[0];
  			break;
  		case HWSIM_REGTEST_WORLD_ROAM:
  			if (i == 0)
  				param.regd = &hwsim_world_regdom_custom_01;
  			break;
  		case HWSIM_REGTEST_CUSTOM_WORLD:
  			param.regd = &hwsim_world_regdom_custom_01;
  			break;
  		case HWSIM_REGTEST_CUSTOM_WORLD_2:
  			if (i == 0)
  				param.regd = &hwsim_world_regdom_custom_01;
  			else if (i == 1)
  				param.regd = &hwsim_world_regdom_custom_02;
  			break;
  		case HWSIM_REGTEST_STRICT_FOLLOW:
  			if (i == 0) {
  				param.reg_strict = true;
  				param.reg_alpha2 = hwsim_alpha2s[0];
  			}
  			break;
  		case HWSIM_REGTEST_STRICT_AND_DRIVER_REG:
  			if (i == 0) {
  				param.reg_strict = true;
  				param.reg_alpha2 = hwsim_alpha2s[0];
  			} else if (i == 1) {
  				param.reg_alpha2 = hwsim_alpha2s[1];
  			}
  			break;
  		case HWSIM_REGTEST_ALL:
  			switch (i) {
  			case 0:
  				param.regd = &hwsim_world_regdom_custom_01;
  				break;
  			case 1:
  				param.regd = &hwsim_world_regdom_custom_02;
  				break;
  			case 2:
  				param.reg_alpha2 = hwsim_alpha2s[0];
  				break;
  			case 3:
  				param.reg_alpha2 = hwsim_alpha2s[1];
  				break;
  			case 4:
  				param.reg_strict = true;
  				param.reg_alpha2 = hwsim_alpha2s[2];
  				break;
  			}
  			break;
  		default:
  			break;
  		}
  
  		param.p2p_device = support_p2p_device;
  		param.use_chanctx = channels > 1;
  
  		err = mac80211_hwsim_new_radio(NULL, &param);
  		if (err < 0)
  			goto out_free_radios;
  	}
  
  	hwsim_mon = alloc_netdev(0, "hwsim%d", NET_NAME_UNKNOWN,
  				 hwsim_mon_setup);
  	if (hwsim_mon == NULL) {
  		err = -ENOMEM;
  		goto out_free_radios;
  	}
  
  	rtnl_lock();
  	err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
  	if (err < 0) {
  		rtnl_unlock();
  		goto out_free_radios;
  	}
  
  	err = register_netdevice(hwsim_mon);
  	if (err < 0) {
  		rtnl_unlock();
  		goto out_free_mon;
  	}
  	rtnl_unlock();
  
  	return 0;
  
  out_free_mon:
  	free_netdev(hwsim_mon);
  out_free_radios:
  	mac80211_hwsim_free();
  out_exit_netlink:
  	hwsim_exit_netlink();
  out_unregister_driver:
  	platform_driver_unregister(&mac80211_hwsim_driver);
  out_unregister_pernet:
  	unregister_pernet_device(&hwsim_net_ops);
  out_free_rht:
  	rhashtable_destroy(&hwsim_radios_rht);
  out_free_wq:
  	destroy_workqueue(hwsim_wq);
  	return err;
  }
  module_init(init_mac80211_hwsim);
  
  static void __exit exit_mac80211_hwsim(void)
  {
  	pr_debug("mac80211_hwsim: unregister radios\n");
  
  	hwsim_exit_netlink();
  
  	mac80211_hwsim_free();
  	flush_workqueue(hwsim_wq);
  
  	rhashtable_destroy(&hwsim_radios_rht);
  	unregister_netdev(hwsim_mon);
  	platform_driver_unregister(&mac80211_hwsim_driver);
  	unregister_pernet_device(&hwsim_net_ops);
  	destroy_workqueue(hwsim_wq);
  }
  module_exit(exit_mac80211_hwsim);
  