text: /*
   * This is the new netlink-based wireless configuration interface.
   *
   * Copyright 2006-2009	Johannes Berg <johannes@sipsolutions.net>
   */
  
  #include <linux/if.h>
  #include <linux/module.h>
  #include <linux/err.h>
  #include <linux/list.h>
  #include <linux/if_ether.h>
  #include <linux/ieee80211.h>
  #include <linux/nl80211.h>
  #include <linux/rtnetlink.h>
  #include <linux/netlink.h>
  #include <linux/etherdevice.h>
  #include <net/net_namespace.h>
  #include <net/genetlink.h>
  #include <net/cfg80211.h>
  #include <net/sock.h>
  #include "core.h"
  #include "nl80211.h"
  #include "reg.h"
  
  /* the netlink family */
  static struct genl_family nl80211_fam = {
  	.id = GENL_ID_GENERATE,	/* don't bother with a hardcoded ID */
  	.name = "nl80211",	/* have users key off the name instead */
  	.hdrsize = 0,		/* no private header */
  	.version = 1,		/* no particular meaning now */
  	.maxattr = NL80211_ATTR_MAX,
  	.netnsok = true,
  };
  
  /* internal helper: get rdev and dev */
  static int get_rdev_dev_by_info_ifindex(struct genl_info *info,
  				       struct cfg80211_registered_device **rdev,
  				       struct net_device **dev)
  {
  	struct nlattr **attrs = info->attrs;
  	int ifindex;
  
  	if (!attrs[NL80211_ATTR_IFINDEX])
  		return -EINVAL;
  
  	ifindex = nla_get_u32(attrs[NL80211_ATTR_IFINDEX]);
  	*dev = dev_get_by_index(genl_info_net(info), ifindex);
  	if (!*dev)
  		return -ENODEV;
  
  	*rdev = cfg80211_get_dev_from_ifindex(genl_info_net(info), ifindex);
  	if (IS_ERR(*rdev)) {
  		dev_put(*dev);
  		return PTR_ERR(*rdev);
  	}
  
  	return 0;
  }
  
  /* policy for the attributes */
  static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
  	[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
  	[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
  				      .len = 20-1 },
  	[NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
  	[NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
  	[NL80211_ATTR_WIPHY_CHANNEL_TYPE] = { .type = NLA_U32 },
  	[NL80211_ATTR_WIPHY_RETRY_SHORT] = { .type = NLA_U8 },
  	[NL80211_ATTR_WIPHY_RETRY_LONG] = { .type = NLA_U8 },
  	[NL80211_ATTR_WIPHY_FRAG_THRESHOLD] = { .type = NLA_U32 },
  	[NL80211_ATTR_WIPHY_RTS_THRESHOLD] = { .type = NLA_U32 },
  
  	[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
  	[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
  	[NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
  
  	[NL80211_ATTR_MAC] = { .type = NLA_BINARY, .len = ETH_ALEN },
  	[NL80211_ATTR_PREV_BSSID] = { .type = NLA_BINARY, .len = ETH_ALEN },
  
  	[NL80211_ATTR_KEY] = { .type = NLA_NESTED, },
  	[NL80211_ATTR_KEY_DATA] = { .type = NLA_BINARY,
  				    .len = WLAN_MAX_KEY_LEN },
  	[NL80211_ATTR_KEY_IDX] = { .type = NLA_U8 },
  	[NL80211_ATTR_KEY_CIPHER] = { .type = NLA_U32 },
  	[NL80211_ATTR_KEY_DEFAULT] = { .type = NLA_FLAG },
  	[NL80211_ATTR_KEY_SEQ] = { .type = NLA_BINARY, .len = 8 },
  
  	[NL80211_ATTR_BEACON_INTERVAL] = { .type = NLA_U32 },
  	[NL80211_ATTR_DTIM_PERIOD] = { .type = NLA_U32 },
  	[NL80211_ATTR_BEACON_HEAD] = { .type = NLA_BINARY,
  				       .len = IEEE80211_MAX_DATA_LEN },
  	[NL80211_ATTR_BEACON_TAIL] = { .type = NLA_BINARY,
  				       .len = IEEE80211_MAX_DATA_LEN },
  	[NL80211_ATTR_STA_AID] = { .type = NLA_U16 },
  	[NL80211_ATTR_STA_FLAGS] = { .type = NLA_NESTED },
  	[NL80211_ATTR_STA_LISTEN_INTERVAL] = { .type = NLA_U16 },
  	[NL80211_ATTR_STA_SUPPORTED_RATES] = { .type = NLA_BINARY,
  					       .len = NL80211_MAX_SUPP_RATES },
  	[NL80211_ATTR_STA_PLINK_ACTION] = { .type = NLA_U8 },
  	[NL80211_ATTR_STA_VLAN] = { .type = NLA_U32 },
  	[NL80211_ATTR_MNTR_FLAGS] = { /* NLA_NESTED can't be empty */ },
  	[NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY,
  				.len = IEEE80211_MAX_MESH_ID_LEN },
  	[NL80211_ATTR_MPATH_NEXT_HOP] = { .type = NLA_U32 },
  
  	[NL80211_ATTR_REG_ALPHA2] = { .type = NLA_STRING, .len = 2 },
  	[NL80211_ATTR_REG_RULES] = { .type = NLA_NESTED },
  
  	[NL80211_ATTR_BSS_CTS_PROT] = { .type = NLA_U8 },
  	[NL80211_ATTR_BSS_SHORT_PREAMBLE] = { .type = NLA_U8 },
  	[NL80211_ATTR_BSS_SHORT_SLOT_TIME] = { .type = NLA_U8 },
  	[NL80211_ATTR_BSS_BASIC_RATES] = { .type = NLA_BINARY,
  					   .len = NL80211_MAX_SUPP_RATES },
  
  	[NL80211_ATTR_MESH_PARAMS] = { .type = NLA_NESTED },
  
  	[NL80211_ATTR_HT_CAPABILITY] = { .type = NLA_BINARY,
  					 .len = NL80211_HT_CAPABILITY_LEN },
  
  	[NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
  	[NL80211_ATTR_IE] = { .type = NLA_BINARY,
  			      .len = IEEE80211_MAX_DATA_LEN },
  	[NL80211_ATTR_SCAN_FREQUENCIES] = { .type = NLA_NESTED },
  	[NL80211_ATTR_SCAN_SSIDS] = { .type = NLA_NESTED },
  
  	[NL80211_ATTR_SSID] = { .type = NLA_BINARY,
  				.len = IEEE80211_MAX_SSID_LEN },
  	[NL80211_ATTR_AUTH_TYPE] = { .type = NLA_U32 },
  	[NL80211_ATTR_REASON_CODE] = { .type = NLA_U16 },
  	[NL80211_ATTR_FREQ_FIXED] = { .type = NLA_FLAG },
  	[NL80211_ATTR_TIMED_OUT] = { .type = NLA_FLAG },
  	[NL80211_ATTR_USE_MFP] = { .type = NLA_U32 },
  	[NL80211_ATTR_STA_FLAGS2] = {
  		.len = sizeof(struct nl80211_sta_flag_update),
  	},
  	[NL80211_ATTR_CONTROL_PORT] = { .type = NLA_FLAG },
  	[NL80211_ATTR_PRIVACY] = { .type = NLA_FLAG },
  	[NL80211_ATTR_CIPHER_SUITE_GROUP] = { .type = NLA_U32 },
  	[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
  	[NL80211_ATTR_PID] = { .type = NLA_U32 },
  };
  
  /* policy for the attributes */
  static struct nla_policy
  nl80211_key_policy[NL80211_KEY_MAX + 1] __read_mostly = {
  	[NL80211_KEY_DATA] = { .type = NLA_BINARY, .len = WLAN_MAX_KEY_LEN },
  	[NL80211_KEY_IDX] = { .type = NLA_U8 },
  	[NL80211_KEY_CIPHER] = { .type = NLA_U32 },
  	[NL80211_KEY_SEQ] = { .type = NLA_BINARY, .len = 8 },
  	[NL80211_KEY_DEFAULT] = { .type = NLA_FLAG },
  	[NL80211_KEY_DEFAULT_MGMT] = { .type = NLA_FLAG },
  };
  
  /* IE validation */
  static bool is_valid_ie_attr(const struct nlattr *attr)
  {
  	const u8 *pos;
  	int len;
  
  	if (!attr)
  		return true;
  
  	pos = nla_data(attr);
  	len = nla_len(attr);
  
  	while (len) {
  		u8 elemlen;
  
  		if (len < 2)
  			return false;
  		len -= 2;
  
  		elemlen = pos[1];
  		if (elemlen > len)
  			return false;
  
  		len -= elemlen;
  		pos += 2 + elemlen;
  	}
  
  	return true;
  }
  
  /* message building helper */
  static inline void *nl80211hdr_put(struct sk_buff *skb, u32 pid, u32 seq,
  				   int flags, u8 cmd)
  {
  	/* since there is no private header just add the generic one */
  	return genlmsg_put(skb, pid, seq, &nl80211_fam, flags, cmd);
  }
  
  static int nl80211_msg_put_channel(struct sk_buff *msg,
  				   struct ieee80211_channel *chan)
  {
  	NLA_PUT_U32(msg, NL80211_FREQUENCY_ATTR_FREQ,
  		    chan->center_freq);
  
  	if (chan->flags & IEEE80211_CHAN_DISABLED)
  		NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_DISABLED);
  	if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)
  		NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_PASSIVE_SCAN);
  	if (chan->flags & IEEE80211_CHAN_NO_IBSS)
  		NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_NO_IBSS);
  	if (chan->flags & IEEE80211_CHAN_RADAR)
  		NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_RADAR);
  
  	NLA_PUT_U32(msg, NL80211_FREQUENCY_ATTR_MAX_TX_POWER,
  		    DBM_TO_MBM(chan->max_power));
  
  	return 0;
  
   nla_put_failure:
  	return -ENOBUFS;
  }
  
  /* netlink command implementations */
  
  struct key_parse {
  	struct key_params p;
  	int idx;
  	bool def, defmgmt;
  };
  
  static int nl80211_parse_key_new(struct nlattr *key, struct key_parse *k)
  {
  	struct nlattr *tb[NL80211_KEY_MAX + 1];
  	int err = nla_parse_nested(tb, NL80211_KEY_MAX, key,
  				   nl80211_key_policy);
  	if (err)
  		return err;
  
  	k->def = !!tb[NL80211_KEY_DEFAULT];
  	k->defmgmt = !!tb[NL80211_KEY_DEFAULT_MGMT];
  
  	if (tb[NL80211_KEY_IDX])
  		k->idx = nla_get_u8(tb[NL80211_KEY_IDX]);
  
  	if (tb[NL80211_KEY_DATA]) {
  		k->p.key = nla_data(tb[NL80211_KEY_DATA]);
  		k->p.key_len = nla_len(tb[NL80211_KEY_DATA]);
  	}
  
  	if (tb[NL80211_KEY_SEQ]) {
  		k->p.seq = nla_data(tb[NL80211_KEY_SEQ]);
  		k->p.seq_len = nla_len(tb[NL80211_KEY_SEQ]);
  	}
  
  	if (tb[NL80211_KEY_CIPHER])
  		k->p.cipher = nla_get_u32(tb[NL80211_KEY_CIPHER]);
  
  	return 0;
  }
  
  static int nl80211_parse_key_old(struct genl_info *info, struct key_parse *k)
  {
  	if (info->attrs[NL80211_ATTR_KEY_DATA]) {
  		k->p.key = nla_data(info->attrs[NL80211_ATTR_KEY_DATA]);
  		k->p.key_len = nla_len(info->attrs[NL80211_ATTR_KEY_DATA]);
  	}
  
  	if (info->attrs[NL80211_ATTR_KEY_SEQ]) {
  		k->p.seq = nla_data(info->attrs[NL80211_ATTR_KEY_SEQ]);
  		k->p.seq_len = nla_len(info->attrs[NL80211_ATTR_KEY_SEQ]);
  	}
  
  	if (info->attrs[NL80211_ATTR_KEY_IDX])
  		k->idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
  
  	if (info->attrs[NL80211_ATTR_KEY_CIPHER])
  		k->p.cipher = nla_get_u32(info->attrs[NL80211_ATTR_KEY_CIPHER]);
  
  	k->def = !!info->attrs[NL80211_ATTR_KEY_DEFAULT];
  	k->defmgmt = !!info->attrs[NL80211_ATTR_KEY_DEFAULT_MGMT];
  
  	return 0;
  }
  
  static int nl80211_parse_key(struct genl_info *info, struct key_parse *k)
  {
  	int err;
  
  	memset(k, 0, sizeof(*k));
  	k->idx = -1;
  
  	if (info->attrs[NL80211_ATTR_KEY])
  		err = nl80211_parse_key_new(info->attrs[NL80211_ATTR_KEY], k);
  	else
  		err = nl80211_parse_key_old(info, k);
  
  	if (err)
  		return err;
  
  	if (k->def && k->defmgmt)
  		return -EINVAL;
  
  	if (k->idx != -1) {
  		if (k->defmgmt) {
  			if (k->idx < 4 || k->idx > 5)
  				return -EINVAL;
  		} else if (k->def) {
  			if (k->idx < 0 || k->idx > 3)
  				return -EINVAL;
  		} else {
  			if (k->idx < 0 || k->idx > 5)
  				return -EINVAL;
  		}
  	}
  
  	return 0;
  }
  
  static struct cfg80211_cached_keys *
  nl80211_parse_connkeys(struct cfg80211_registered_device *rdev,
  		       struct nlattr *keys)
  {
  	struct key_parse parse;
  	struct nlattr *key;
  	struct cfg80211_cached_keys *result;
  	int rem, err, def = 0;
  
  	result = kzalloc(sizeof(*result), GFP_KERNEL);
  	if (!result)
  		return ERR_PTR(-ENOMEM);
  
  	result->def = -1;
  	result->defmgmt = -1;
  
  	nla_for_each_nested(key, keys, rem) {
  		memset(&parse, 0, sizeof(parse));
  		parse.idx = -1;
  
  		err = nl80211_parse_key_new(key, &parse);
  		if (err)
  			goto error;
  		err = -EINVAL;
  		if (!parse.p.key)
  			goto error;
  		if (parse.idx < 0 || parse.idx > 4)
  			goto error;
  		if (parse.def) {
  			if (def)
  				goto error;
  			def = 1;
  			result->def = parse.idx;
  		} else if (parse.defmgmt)
  			goto error;
  		err = cfg80211_validate_key_settings(rdev, &parse.p,
  						     parse.idx, NULL);
  		if (err)
  			goto error;
  		result->params[parse.idx].cipher = parse.p.cipher;
  		result->params[parse.idx].key_len = parse.p.key_len;
  		result->params[parse.idx].key = result->data[parse.idx];
  		memcpy(result->data[parse.idx], parse.p.key, parse.p.key_len);
  	}
  
  	return result;
   error:
  	kfree(result);
  	return ERR_PTR(err);
  }
  
  static int nl80211_key_allowed(struct wireless_dev *wdev)
  {
  	ASSERT_WDEV_LOCK(wdev);
  
  	if (!netif_running(wdev->netdev))
  		return -ENETDOWN;
  
  	switch (wdev->iftype) {
  	case NL80211_IFTYPE_AP:
  	case NL80211_IFTYPE_AP_VLAN:
  		break;
  	case NL80211_IFTYPE_ADHOC:
  		if (!wdev->current_bss)
  			return -ENOLINK;
  		break;
  	case NL80211_IFTYPE_STATION:
  		if (wdev->sme_state != CFG80211_SME_CONNECTED)
  			return -ENOLINK;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
  			      struct cfg80211_registered_device *dev)
  {
  	void *hdr;
  	struct nlattr *nl_bands, *nl_band;
  	struct nlattr *nl_freqs, *nl_freq;
  	struct nlattr *nl_rates, *nl_rate;
  	struct nlattr *nl_modes;
  	struct nlattr *nl_cmds;
  	enum ieee80211_band band;
  	struct ieee80211_channel *chan;
  	struct ieee80211_rate *rate;
  	int i;
  	u16 ifmodes = dev->wiphy.interface_modes;
  
  	hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_WIPHY);
  	if (!hdr)
  		return -1;
  
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, dev->wiphy_idx);
  	NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
  
  	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION,
  		    cfg80211_rdev_list_generation);
  
  	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_RETRY_SHORT,
  		   dev->wiphy.retry_short);
  	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_RETRY_LONG,
  		   dev->wiphy.retry_long);
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FRAG_THRESHOLD,
  		    dev->wiphy.frag_threshold);
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_RTS_THRESHOLD,
  		    dev->wiphy.rts_threshold);
  
  	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
  		   dev->wiphy.max_scan_ssids);
  	NLA_PUT_U16(msg, NL80211_ATTR_MAX_SCAN_IE_LEN,
  		    dev->wiphy.max_scan_ie_len);
  
  	NLA_PUT(msg, NL80211_ATTR_CIPHER_SUITES,
  		sizeof(u32) * dev->wiphy.n_cipher_suites,
  		dev->wiphy.cipher_suites);
  
  	nl_modes = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_IFTYPES);
  	if (!nl_modes)
  		goto nla_put_failure;
  
  	i = 0;
  	while (ifmodes) {
  		if (ifmodes & 1)
  			NLA_PUT_FLAG(msg, i);
  		ifmodes >>= 1;
  		i++;
  	}
  
  	nla_nest_end(msg, nl_modes);
  
  	nl_bands = nla_nest_start(msg, NL80211_ATTR_WIPHY_BANDS);
  	if (!nl_bands)
  		goto nla_put_failure;
  
  	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  		if (!dev->wiphy.bands[band])
  			continue;
  
  		nl_band = nla_nest_start(msg, band);
  		if (!nl_band)
  			goto nla_put_failure;
  
  		/* add HT info */
  		if (dev->wiphy.bands[band]->ht_cap.ht_supported) {
  			NLA_PUT(msg, NL80211_BAND_ATTR_HT_MCS_SET,
  				sizeof(dev->wiphy.bands[band]->ht_cap.mcs),
  				&dev->wiphy.bands[band]->ht_cap.mcs);
  			NLA_PUT_U16(msg, NL80211_BAND_ATTR_HT_CAPA,
  				dev->wiphy.bands[band]->ht_cap.cap);
  			NLA_PUT_U8(msg, NL80211_BAND_ATTR_HT_AMPDU_FACTOR,
  				dev->wiphy.bands[band]->ht_cap.ampdu_factor);
  			NLA_PUT_U8(msg, NL80211_BAND_ATTR_HT_AMPDU_DENSITY,
  				dev->wiphy.bands[band]->ht_cap.ampdu_density);
  		}
  
  		/* add frequencies */
  		nl_freqs = nla_nest_start(msg, NL80211_BAND_ATTR_FREQS);
  		if (!nl_freqs)
  			goto nla_put_failure;
  
  		for (i = 0; i < dev->wiphy.bands[band]->n_channels; i++) {
  			nl_freq = nla_nest_start(msg, i);
  			if (!nl_freq)
  				goto nla_put_failure;
  
  			chan = &dev->wiphy.bands[band]->channels[i];
  
  			if (nl80211_msg_put_channel(msg, chan))
  				goto nla_put_failure;
  
  			nla_nest_end(msg, nl_freq);
  		}
  
  		nla_nest_end(msg, nl_freqs);
  
  		/* add bitrates */
  		nl_rates = nla_nest_start(msg, NL80211_BAND_ATTR_RATES);
  		if (!nl_rates)
  			goto nla_put_failure;
  
  		for (i = 0; i < dev->wiphy.bands[band]->n_bitrates; i++) {
  			nl_rate = nla_nest_start(msg, i);
  			if (!nl_rate)
  				goto nla_put_failure;
  
  			rate = &dev->wiphy.bands[band]->bitrates[i];
  			NLA_PUT_U32(msg, NL80211_BITRATE_ATTR_RATE,
  				    rate->bitrate);
  			if (rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
  				NLA_PUT_FLAG(msg,
  					NL80211_BITRATE_ATTR_2GHZ_SHORTPREAMBLE);
  
  			nla_nest_end(msg, nl_rate);
  		}
  
  		nla_nest_end(msg, nl_rates);
  
  		nla_nest_end(msg, nl_band);
  	}
  	nla_nest_end(msg, nl_bands);
  
  	nl_cmds = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_COMMANDS);
  	if (!nl_cmds)
  		goto nla_put_failure;
  
  	i = 0;
  #define CMD(op, n)						\
  	 do {							\
  		if (dev->ops->op) {				\
  			i++;					\
  			NLA_PUT_U32(msg, i, NL80211_CMD_ ## n);	\
  		}						\
  	} while (0)
  
  	CMD(add_virtual_intf, NEW_INTERFACE);
  	CMD(change_virtual_intf, SET_INTERFACE);
  	CMD(add_key, NEW_KEY);
  	CMD(add_beacon, NEW_BEACON);
  	CMD(add_station, NEW_STATION);
  	CMD(add_mpath, NEW_MPATH);
  	CMD(set_mesh_params, SET_MESH_PARAMS);
  	CMD(change_bss, SET_BSS);
  	CMD(auth, AUTHENTICATE);
  	CMD(assoc, ASSOCIATE);
  	CMD(deauth, DEAUTHENTICATE);
  	CMD(disassoc, DISASSOCIATE);
  	CMD(join_ibss, JOIN_IBSS);
  	if (dev->wiphy.netnsok) {
  		i++;
  		NLA_PUT_U32(msg, i, NL80211_CMD_SET_WIPHY_NETNS);
  	}
  
  #undef CMD
  
  	if (dev->ops->connect || dev->ops->auth) {
  		i++;
  		NLA_PUT_U32(msg, i, NL80211_CMD_CONNECT);
  	}
  
  	if (dev->ops->disconnect || dev->ops->deauth) {
  		i++;
  		NLA_PUT_U32(msg, i, NL80211_CMD_DISCONNECT);
  	}
  
  	nla_nest_end(msg, nl_cmds);
  
  	return genlmsg_end(msg, hdr);
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	return -EMSGSIZE;
  }
  
  static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
  {
  	int idx = 0;
  	int start = cb->args[0];
  	struct cfg80211_registered_device *dev;
  
  	mutex_lock(&cfg80211_mutex);
  	list_for_each_entry(dev, &cfg80211_rdev_list, list) {
  		if (!net_eq(wiphy_net(&dev->wiphy), sock_net(skb->sk)))
  			continue;
  		if (++idx <= start)
  			continue;
  		if (nl80211_send_wiphy(skb, NETLINK_CB(cb->skb).pid,
  				       cb->nlh->nlmsg_seq, NLM_F_MULTI,
  				       dev) < 0) {
  			idx--;
  			break;
  		}
  	}
  	mutex_unlock(&cfg80211_mutex);
  
  	cb->args[0] = idx;
  
  	return skb->len;
  }
  
  static int nl80211_get_wiphy(struct sk_buff *skb, struct genl_info *info)
  {
  	struct sk_buff *msg;
  	struct cfg80211_registered_device *dev;
  
  	dev = cfg80211_get_dev_from_info(info);
  	if (IS_ERR(dev))
  		return PTR_ERR(dev);
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		goto out_err;
  
  	if (nl80211_send_wiphy(msg, info->snd_pid, info->snd_seq, 0, dev) < 0)
  		goto out_free;
  
  	cfg80211_unlock_rdev(dev);
  
  	return genlmsg_reply(msg, info);
  
   out_free:
  	nlmsg_free(msg);
   out_err:
  	cfg80211_unlock_rdev(dev);
  	return -ENOBUFS;
  }
  
  static const struct nla_policy txq_params_policy[NL80211_TXQ_ATTR_MAX + 1] = {
  	[NL80211_TXQ_ATTR_QUEUE]		= { .type = NLA_U8 },
  	[NL80211_TXQ_ATTR_TXOP]			= { .type = NLA_U16 },
  	[NL80211_TXQ_ATTR_CWMIN]		= { .type = NLA_U16 },
  	[NL80211_TXQ_ATTR_CWMAX]		= { .type = NLA_U16 },
  	[NL80211_TXQ_ATTR_AIFS]			= { .type = NLA_U8 },
  };
  
  static int parse_txq_params(struct nlattr *tb[],
  			    struct ieee80211_txq_params *txq_params)
  {
  	if (!tb[NL80211_TXQ_ATTR_QUEUE] || !tb[NL80211_TXQ_ATTR_TXOP] ||
  	    !tb[NL80211_TXQ_ATTR_CWMIN] || !tb[NL80211_TXQ_ATTR_CWMAX] ||
  	    !tb[NL80211_TXQ_ATTR_AIFS])
  		return -EINVAL;
  
  	txq_params->queue = nla_get_u8(tb[NL80211_TXQ_ATTR_QUEUE]);
  	txq_params->txop = nla_get_u16(tb[NL80211_TXQ_ATTR_TXOP]);
  	txq_params->cwmin = nla_get_u16(tb[NL80211_TXQ_ATTR_CWMIN]);
  	txq_params->cwmax = nla_get_u16(tb[NL80211_TXQ_ATTR_CWMAX]);
  	txq_params->aifs = nla_get_u8(tb[NL80211_TXQ_ATTR_AIFS]);
  
  	return 0;
  }
  
  static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int result = 0, rem_txq_params = 0;
  	struct nlattr *nl_txq_params;
  	u32 changed;
  	u8 retry_short = 0, retry_long = 0;
  	u32 frag_threshold = 0, rts_threshold = 0;
  
  	rtnl_lock();
  
  	mutex_lock(&cfg80211_mutex);
  
  	rdev = __cfg80211_rdev_from_info(info);
  	if (IS_ERR(rdev)) {
  		mutex_unlock(&cfg80211_mutex);
  		result = PTR_ERR(rdev);
  		goto unlock;
  	}
  
  	mutex_lock(&rdev->mtx);
  
  	if (info->attrs[NL80211_ATTR_WIPHY_NAME])
  		result = cfg80211_dev_rename(
  			rdev, nla_data(info->attrs[NL80211_ATTR_WIPHY_NAME]));
  
  	mutex_unlock(&cfg80211_mutex);
  
  	if (result)
  		goto bad_res;
  
  	if (info->attrs[NL80211_ATTR_WIPHY_TXQ_PARAMS]) {
  		struct ieee80211_txq_params txq_params;
  		struct nlattr *tb[NL80211_TXQ_ATTR_MAX + 1];
  
  		if (!rdev->ops->set_txq_params) {
  			result = -EOPNOTSUPP;
  			goto bad_res;
  		}
  
  		nla_for_each_nested(nl_txq_params,
  				    info->attrs[NL80211_ATTR_WIPHY_TXQ_PARAMS],
  				    rem_txq_params) {
  			nla_parse(tb, NL80211_TXQ_ATTR_MAX,
  				  nla_data(nl_txq_params),
  				  nla_len(nl_txq_params),
  				  txq_params_policy);
  			result = parse_txq_params(tb, &txq_params);
  			if (result)
  				goto bad_res;
  
  			result = rdev->ops->set_txq_params(&rdev->wiphy,
  							   &txq_params);
  			if (result)
  				goto bad_res;
  		}
  	}
  
  	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
  		enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
  		u32 freq;
  
  		result = -EINVAL;
  
  		if (info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
  			channel_type = nla_get_u32(info->attrs[
  					   NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
  			if (channel_type != NL80211_CHAN_NO_HT &&
  			    channel_type != NL80211_CHAN_HT20 &&
  			    channel_type != NL80211_CHAN_HT40PLUS &&
  			    channel_type != NL80211_CHAN_HT40MINUS)
  				goto bad_res;
  		}
  
  		freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);
  
  		mutex_lock(&rdev->devlist_mtx);
  		result = rdev_set_freq(rdev, NULL, freq, channel_type);
  		mutex_unlock(&rdev->devlist_mtx);
  		if (result)
  			goto bad_res;
  	}
  
  	changed = 0;
  
  	if (info->attrs[NL80211_ATTR_WIPHY_RETRY_SHORT]) {
  		retry_short = nla_get_u8(
  			info->attrs[NL80211_ATTR_WIPHY_RETRY_SHORT]);
  		if (retry_short == 0) {
  			result = -EINVAL;
  			goto bad_res;
  		}
  		changed |= WIPHY_PARAM_RETRY_SHORT;
  	}
  
  	if (info->attrs[NL80211_ATTR_WIPHY_RETRY_LONG]) {
  		retry_long = nla_get_u8(
  			info->attrs[NL80211_ATTR_WIPHY_RETRY_LONG]);
  		if (retry_long == 0) {
  			result = -EINVAL;
  			goto bad_res;
  		}
  		changed |= WIPHY_PARAM_RETRY_LONG;
  	}
  
  	if (info->attrs[NL80211_ATTR_WIPHY_FRAG_THRESHOLD]) {
  		frag_threshold = nla_get_u32(
  			info->attrs[NL80211_ATTR_WIPHY_FRAG_THRESHOLD]);
  		if (frag_threshold < 256) {
  			result = -EINVAL;
  			goto bad_res;
  		}
  		if (frag_threshold != (u32) -1) {
  			/*
  			 * Fragments (apart from the last one) are required to
  			 * have even length. Make the fragmentation code
  			 * simpler by stripping LSB should someone try to use
  			 * odd threshold value.
  			 */
  			frag_threshold &= ~0x1;
  		}
  		changed |= WIPHY_PARAM_FRAG_THRESHOLD;
  	}
  
  	if (info->attrs[NL80211_ATTR_WIPHY_RTS_THRESHOLD]) {
  		rts_threshold = nla_get_u32(
  			info->attrs[NL80211_ATTR_WIPHY_RTS_THRESHOLD]);
  		changed |= WIPHY_PARAM_RTS_THRESHOLD;
  	}
  
  	if (changed) {
  		u8 old_retry_short, old_retry_long;
  		u32 old_frag_threshold, old_rts_threshold;
  
  		if (!rdev->ops->set_wiphy_params) {
  			result = -EOPNOTSUPP;
  			goto bad_res;
  		}
  
  		old_retry_short = rdev->wiphy.retry_short;
  		old_retry_long = rdev->wiphy.retry_long;
  		old_frag_threshold = rdev->wiphy.frag_threshold;
  		old_rts_threshold = rdev->wiphy.rts_threshold;
  
  		if (changed & WIPHY_PARAM_RETRY_SHORT)
  			rdev->wiphy.retry_short = retry_short;
  		if (changed & WIPHY_PARAM_RETRY_LONG)
  			rdev->wiphy.retry_long = retry_long;
  		if (changed & WIPHY_PARAM_FRAG_THRESHOLD)
  			rdev->wiphy.frag_threshold = frag_threshold;
  		if (changed & WIPHY_PARAM_RTS_THRESHOLD)
  			rdev->wiphy.rts_threshold = rts_threshold;
  
  		result = rdev->ops->set_wiphy_params(&rdev->wiphy, changed);
  		if (result) {
  			rdev->wiphy.retry_short = old_retry_short;
  			rdev->wiphy.retry_long = old_retry_long;
  			rdev->wiphy.frag_threshold = old_frag_threshold;
  			rdev->wiphy.rts_threshold = old_rts_threshold;
  		}
  	}
  
   bad_res:
  	mutex_unlock(&rdev->mtx);
   unlock:
  	rtnl_unlock();
  	return result;
  }
  
  
  static int nl80211_send_iface(struct sk_buff *msg, u32 pid, u32 seq, int flags,
  			      struct cfg80211_registered_device *rdev,
  			      struct net_device *dev)
  {
  	void *hdr;
  
  	hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_INTERFACE);
  	if (!hdr)
  		return -1;
  
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
  	NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, dev->name);
  	NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, dev->ieee80211_ptr->iftype);
  
  	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION,
  		    rdev->devlist_generation ^
  			(cfg80211_rdev_list_generation << 2));
  
  	return genlmsg_end(msg, hdr);
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	return -EMSGSIZE;
  }
  
  static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *cb)
  {
  	int wp_idx = 0;
  	int if_idx = 0;
  	int wp_start = cb->args[0];
  	int if_start = cb->args[1];
  	struct cfg80211_registered_device *rdev;
  	struct wireless_dev *wdev;
  
  	mutex_lock(&cfg80211_mutex);
  	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  		if (!net_eq(wiphy_net(&rdev->wiphy), sock_net(skb->sk)))
  			continue;
  		if (wp_idx < wp_start) {
  			wp_idx++;
  			continue;
  		}
  		if_idx = 0;
  
  		mutex_lock(&rdev->devlist_mtx);
  		list_for_each_entry(wdev, &rdev->netdev_list, list) {
  			if (if_idx < if_start) {
  				if_idx++;
  				continue;
  			}
  			if (nl80211_send_iface(skb, NETLINK_CB(cb->skb).pid,
  					       cb->nlh->nlmsg_seq, NLM_F_MULTI,
  					       rdev, wdev->netdev) < 0) {
  				mutex_unlock(&rdev->devlist_mtx);
  				goto out;
  			}
  			if_idx++;
  		}
  		mutex_unlock(&rdev->devlist_mtx);
  
  		wp_idx++;
  	}
   out:
  	mutex_unlock(&cfg80211_mutex);
  
  	cb->args[0] = wp_idx;
  	cb->args[1] = if_idx;
  
  	return skb->len;
  }
  
  static int nl80211_get_interface(struct sk_buff *skb, struct genl_info *info)
  {
  	struct sk_buff *msg;
  	struct cfg80211_registered_device *dev;
  	struct net_device *netdev;
  	int err;
  
  	err = get_rdev_dev_by_info_ifindex(info, &dev, &netdev);
  	if (err)
  		return err;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		goto out_err;
  
  	if (nl80211_send_iface(msg, info->snd_pid, info->snd_seq, 0,
  			       dev, netdev) < 0)
  		goto out_free;
  
  	dev_put(netdev);
  	cfg80211_unlock_rdev(dev);
  
  	return genlmsg_reply(msg, info);
  
   out_free:
  	nlmsg_free(msg);
   out_err:
  	dev_put(netdev);
  	cfg80211_unlock_rdev(dev);
  	return -ENOBUFS;
  }
  
  static const struct nla_policy mntr_flags_policy[NL80211_MNTR_FLAG_MAX + 1] = {
  	[NL80211_MNTR_FLAG_FCSFAIL] = { .type = NLA_FLAG },
  	[NL80211_MNTR_FLAG_PLCPFAIL] = { .type = NLA_FLAG },
  	[NL80211_MNTR_FLAG_CONTROL] = { .type = NLA_FLAG },
  	[NL80211_MNTR_FLAG_OTHER_BSS] = { .type = NLA_FLAG },
  	[NL80211_MNTR_FLAG_COOK_FRAMES] = { .type = NLA_FLAG },
  };
  
  static int parse_monitor_flags(struct nlattr *nla, u32 *mntrflags)
  {
  	struct nlattr *flags[NL80211_MNTR_FLAG_MAX + 1];
  	int flag;
  
  	*mntrflags = 0;
  
  	if (!nla)
  		return -EINVAL;
  
  	if (nla_parse_nested(flags, NL80211_MNTR_FLAG_MAX,
  			     nla, mntr_flags_policy))
  		return -EINVAL;
  
  	for (flag = 1; flag <= NL80211_MNTR_FLAG_MAX; flag++)
  		if (flags[flag])
  			*mntrflags |= (1<<flag);
  
  	return 0;
  }
  
  static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct vif_params params;
  	int err;
  	enum nl80211_iftype otype, ntype;
  	struct net_device *dev;
  	u32 _flags, *flags = NULL;
  	bool change = false;
  
  	memset(&params, 0, sizeof(params));
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	otype = ntype = dev->ieee80211_ptr->iftype;
  
  	if (info->attrs[NL80211_ATTR_IFTYPE]) {
  		ntype = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
  		if (otype != ntype)
  			change = true;
  		if (ntype > NL80211_IFTYPE_MAX) {
  			err = -EINVAL;
  			goto unlock;
  		}
  	}
  
  	if (info->attrs[NL80211_ATTR_MESH_ID]) {
  		if (ntype != NL80211_IFTYPE_MESH_POINT) {
  			err = -EINVAL;
  			goto unlock;
  		}
  		params.mesh_id = nla_data(info->attrs[NL80211_ATTR_MESH_ID]);
  		params.mesh_id_len = nla_len(info->attrs[NL80211_ATTR_MESH_ID]);
  		change = true;
  	}
  
  	if (info->attrs[NL80211_ATTR_MNTR_FLAGS]) {
  		if (ntype != NL80211_IFTYPE_MONITOR) {
  			err = -EINVAL;
  			goto unlock;
  		}
  		err = parse_monitor_flags(info->attrs[NL80211_ATTR_MNTR_FLAGS],
  					  &_flags);
  		if (err)
  			goto unlock;
  
  		flags = &_flags;
  		change = true;
  	}
  
  	if (change)
  		err = cfg80211_change_iface(rdev, dev, ntype, flags, &params);
  	else
  		err = 0;
  
   unlock:
  	dev_put(dev);
  	cfg80211_unlock_rdev(rdev);
   unlock_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct vif_params params;
  	int err;
  	enum nl80211_iftype type = NL80211_IFTYPE_UNSPECIFIED;
  	u32 flags;
  
  	memset(&params, 0, sizeof(params));
  
  	if (!info->attrs[NL80211_ATTR_IFNAME])
  		return -EINVAL;
  
  	if (info->attrs[NL80211_ATTR_IFTYPE]) {
  		type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
  		if (type > NL80211_IFTYPE_MAX)
  			return -EINVAL;
  	}
  
  	rtnl_lock();
  
  	rdev = cfg80211_get_dev_from_info(info);
  	if (IS_ERR(rdev)) {
  		err = PTR_ERR(rdev);
  		goto unlock_rtnl;
  	}
  
  	if (!rdev->ops->add_virtual_intf ||
  	    !(rdev->wiphy.interface_modes & (1 << type))) {
  		err = -EOPNOTSUPP;
  		goto unlock;
  	}
  
  	if (type == NL80211_IFTYPE_MESH_POINT &&
  	    info->attrs[NL80211_ATTR_MESH_ID]) {
  		params.mesh_id = nla_data(info->attrs[NL80211_ATTR_MESH_ID]);
  		params.mesh_id_len = nla_len(info->attrs[NL80211_ATTR_MESH_ID]);
  	}
  
  	err = parse_monitor_flags(type == NL80211_IFTYPE_MONITOR ?
  				  info->attrs[NL80211_ATTR_MNTR_FLAGS] : NULL,
  				  &flags);
  	err = rdev->ops->add_virtual_intf(&rdev->wiphy,
  		nla_data(info->attrs[NL80211_ATTR_IFNAME]),
  		type, err ? NULL : &flags, &params);
  
   unlock:
  	cfg80211_unlock_rdev(rdev);
   unlock_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  static int nl80211_del_interface(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->del_virtual_intf) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	err = rdev->ops->del_virtual_intf(&rdev->wiphy, dev);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   unlock_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  struct get_key_cookie {
  	struct sk_buff *msg;
  	int error;
  	int idx;
  };
  
  static void get_key_callback(void *c, struct key_params *params)
  {
  	struct nlattr *key;
  	struct get_key_cookie *cookie = c;
  
  	if (params->key)
  		NLA_PUT(cookie->msg, NL80211_ATTR_KEY_DATA,
  			params->key_len, params->key);
  
  	if (params->seq)
  		NLA_PUT(cookie->msg, NL80211_ATTR_KEY_SEQ,
  			params->seq_len, params->seq);
  
  	if (params->cipher)
  		NLA_PUT_U32(cookie->msg, NL80211_ATTR_KEY_CIPHER,
  			    params->cipher);
  
  	key = nla_nest_start(cookie->msg, NL80211_ATTR_KEY);
  	if (!key)
  		goto nla_put_failure;
  
  	if (params->key)
  		NLA_PUT(cookie->msg, NL80211_KEY_DATA,
  			params->key_len, params->key);
  
  	if (params->seq)
  		NLA_PUT(cookie->msg, NL80211_KEY_SEQ,
  			params->seq_len, params->seq);
  
  	if (params->cipher)
  		NLA_PUT_U32(cookie->msg, NL80211_KEY_CIPHER,
  			    params->cipher);
  
  	NLA_PUT_U8(cookie->msg, NL80211_ATTR_KEY_IDX, cookie->idx);
  
  	nla_nest_end(cookie->msg, key);
  
  	return;
   nla_put_failure:
  	cookie->error = 1;
  }
  
  static int nl80211_get_key(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	u8 key_idx = 0;
  	u8 *mac_addr = NULL;
  	struct get_key_cookie cookie = {
  		.error = 0,
  	};
  	void *hdr;
  	struct sk_buff *msg;
  
  	if (info->attrs[NL80211_ATTR_KEY_IDX])
  		key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
  
  	if (key_idx > 5)
  		return -EINVAL;
  
  	if (info->attrs[NL80211_ATTR_MAC])
  		mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->get_key) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg) {
  		err = -ENOMEM;
  		goto out;
  	}
  
  	hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,
  			     NL80211_CMD_NEW_KEY);
  
  	if (IS_ERR(hdr)) {
  		err = PTR_ERR(hdr);
  		goto free_msg;
  	}
  
  	cookie.msg = msg;
  	cookie.idx = key_idx;
  
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
  	NLA_PUT_U8(msg, NL80211_ATTR_KEY_IDX, key_idx);
  	if (mac_addr)
  		NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
  
  	err = rdev->ops->get_key(&rdev->wiphy, dev, key_idx, mac_addr,
  				&cookie, get_key_callback);
  
  	if (err)
  		goto free_msg;
  
  	if (cookie.error)
  		goto nla_put_failure;
  
  	genlmsg_end(msg, hdr);
  	err = genlmsg_reply(msg, info);
  	goto out;
  
   nla_put_failure:
  	err = -ENOBUFS;
   free_msg:
  	nlmsg_free(msg);
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   unlock_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_set_key(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct key_parse key;
  	int err;
  	struct net_device *dev;
  	int (*func)(struct wiphy *wiphy, struct net_device *netdev,
  		    u8 key_index);
  
  	err = nl80211_parse_key(info, &key);
  	if (err)
  		return err;
  
  	if (key.idx < 0)
  		return -EINVAL;
  
  	/* only support setting default key */
  	if (!key.def && !key.defmgmt)
  		return -EINVAL;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (key.def)
  		func = rdev->ops->set_default_key;
  	else
  		func = rdev->ops->set_default_mgmt_key;
  
  	if (!func) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	wdev_lock(dev->ieee80211_ptr);
  	err = nl80211_key_allowed(dev->ieee80211_ptr);
  	if (!err)
  		err = func(&rdev->wiphy, dev, key.idx);
  
  #ifdef CONFIG_WIRELESS_EXT
  	if (!err) {
  		if (func == rdev->ops->set_default_key)
  			dev->ieee80211_ptr->wext.default_key = key.idx;
  		else
  			dev->ieee80211_ptr->wext.default_mgmt_key = key.idx;
  	}
  #endif
  	wdev_unlock(dev->ieee80211_ptr);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
  
   unlock_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_new_key(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	struct key_parse key;
  	u8 *mac_addr = NULL;
  
  	err = nl80211_parse_key(info, &key);
  	if (err)
  		return err;
  
  	if (!key.p.key)
  		return -EINVAL;
  
  	if (info->attrs[NL80211_ATTR_MAC])
  		mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->add_key) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (cfg80211_validate_key_settings(rdev, &key.p, key.idx, mac_addr)) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	wdev_lock(dev->ieee80211_ptr);
  	err = nl80211_key_allowed(dev->ieee80211_ptr);
  	if (!err)
  		err = rdev->ops->add_key(&rdev->wiphy, dev, key.idx,
  					 mac_addr, &key.p);
  	wdev_unlock(dev->ieee80211_ptr);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   unlock_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_del_key(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	u8 *mac_addr = NULL;
  	struct key_parse key;
  
  	err = nl80211_parse_key(info, &key);
  	if (err)
  		return err;
  
  	if (info->attrs[NL80211_ATTR_MAC])
  		mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->del_key) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	wdev_lock(dev->ieee80211_ptr);
  	err = nl80211_key_allowed(dev->ieee80211_ptr);
  	if (!err)
  		err = rdev->ops->del_key(&rdev->wiphy, dev, key.idx, mac_addr);
  
  #ifdef CONFIG_WIRELESS_EXT
  	if (!err) {
  		if (key.idx == dev->ieee80211_ptr->wext.default_key)
  			dev->ieee80211_ptr->wext.default_key = -1;
  		else if (key.idx == dev->ieee80211_ptr->wext.default_mgmt_key)
  			dev->ieee80211_ptr->wext.default_mgmt_key = -1;
  	}
  #endif
  	wdev_unlock(dev->ieee80211_ptr);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
  
   unlock_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_addset_beacon(struct sk_buff *skb, struct genl_info *info)
  {
          int (*call)(struct wiphy *wiphy, struct net_device *dev,
  		    struct beacon_parameters *info);
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	struct beacon_parameters params;
  	int haveinfo = 0;
  
  	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_BEACON_TAIL]))
  		return -EINVAL;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	switch (info->genlhdr->cmd) {
  	case NL80211_CMD_NEW_BEACON:
  		/* these are required for NEW_BEACON */
  		if (!info->attrs[NL80211_ATTR_BEACON_INTERVAL] ||
  		    !info->attrs[NL80211_ATTR_DTIM_PERIOD] ||
  		    !info->attrs[NL80211_ATTR_BEACON_HEAD]) {
  			err = -EINVAL;
  			goto out;
  		}
  
  		call = rdev->ops->add_beacon;
  		break;
  	case NL80211_CMD_SET_BEACON:
  		call = rdev->ops->set_beacon;
  		break;
  	default:
  		WARN_ON(1);
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!call) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	memset(&params, 0, sizeof(params));
  
  	if (info->attrs[NL80211_ATTR_BEACON_INTERVAL]) {
  		params.interval =
  		    nla_get_u32(info->attrs[NL80211_ATTR_BEACON_INTERVAL]);
  		haveinfo = 1;
  	}
  
  	if (info->attrs[NL80211_ATTR_DTIM_PERIOD]) {
  		params.dtim_period =
  		    nla_get_u32(info->attrs[NL80211_ATTR_DTIM_PERIOD]);
  		haveinfo = 1;
  	}
  
  	if (info->attrs[NL80211_ATTR_BEACON_HEAD]) {
  		params.head = nla_data(info->attrs[NL80211_ATTR_BEACON_HEAD]);
  		params.head_len =
  		    nla_len(info->attrs[NL80211_ATTR_BEACON_HEAD]);
  		haveinfo = 1;
  	}
  
  	if (info->attrs[NL80211_ATTR_BEACON_TAIL]) {
  		params.tail = nla_data(info->attrs[NL80211_ATTR_BEACON_TAIL]);
  		params.tail_len =
  		    nla_len(info->attrs[NL80211_ATTR_BEACON_TAIL]);
  		haveinfo = 1;
  	}
  
  	if (!haveinfo) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	err = call(&rdev->wiphy, dev, &params);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   unlock_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_del_beacon(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->del_beacon) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  	err = rdev->ops->del_beacon(&rdev->wiphy, dev);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   unlock_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static const struct nla_policy sta_flags_policy[NL80211_STA_FLAG_MAX + 1] = {
  	[NL80211_STA_FLAG_AUTHORIZED] = { .type = NLA_FLAG },
  	[NL80211_STA_FLAG_SHORT_PREAMBLE] = { .type = NLA_FLAG },
  	[NL80211_STA_FLAG_WME] = { .type = NLA_FLAG },
  	[NL80211_STA_FLAG_MFP] = { .type = NLA_FLAG },
  };
  
  static int parse_station_flags(struct genl_info *info,
  			       struct station_parameters *params)
  {
  	struct nlattr *flags[NL80211_STA_FLAG_MAX + 1];
  	struct nlattr *nla;
  	int flag;
  
  	/*
  	 * Try parsing the new attribute first so userspace
  	 * can specify both for older kernels.
  	 */
  	nla = info->attrs[NL80211_ATTR_STA_FLAGS2];
  	if (nla) {
  		struct nl80211_sta_flag_update *sta_flags;
  
  		sta_flags = nla_data(nla);
  		params->sta_flags_mask = sta_flags->mask;
  		params->sta_flags_set = sta_flags->set;
  		if ((params->sta_flags_mask |
  		     params->sta_flags_set) & BIT(__NL80211_STA_FLAG_INVALID))
  			return -EINVAL;
  		return 0;
  	}
  
  	/* if present, parse the old attribute */
  
  	nla = info->attrs[NL80211_ATTR_STA_FLAGS];
  	if (!nla)
  		return 0;
  
  	if (nla_parse_nested(flags, NL80211_STA_FLAG_MAX,
  			     nla, sta_flags_policy))
  		return -EINVAL;
  
  	params->sta_flags_mask = (1 << __NL80211_STA_FLAG_AFTER_LAST) - 1;
  	params->sta_flags_mask &= ~1;
  
  	for (flag = 1; flag <= NL80211_STA_FLAG_MAX; flag++)
  		if (flags[flag])
  			params->sta_flags_set |= (1<<flag);
  
  	return 0;
  }
  
  static int nl80211_send_station(struct sk_buff *msg, u32 pid, u32 seq,
  				int flags, struct net_device *dev,
  				u8 *mac_addr, struct station_info *sinfo)
  {
  	void *hdr;
  	struct nlattr *sinfoattr, *txrate;
  	u16 bitrate;
  
  	hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_STATION);
  	if (!hdr)
  		return -1;
  
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
  	NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
  
  	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION, sinfo->generation);
  
  	sinfoattr = nla_nest_start(msg, NL80211_ATTR_STA_INFO);
  	if (!sinfoattr)
  		goto nla_put_failure;
  	if (sinfo->filled & STATION_INFO_INACTIVE_TIME)
  		NLA_PUT_U32(msg, NL80211_STA_INFO_INACTIVE_TIME,
  			    sinfo->inactive_time);
  	if (sinfo->filled & STATION_INFO_RX_BYTES)
  		NLA_PUT_U32(msg, NL80211_STA_INFO_RX_BYTES,
  			    sinfo->rx_bytes);
  	if (sinfo->filled & STATION_INFO_TX_BYTES)
  		NLA_PUT_U32(msg, NL80211_STA_INFO_TX_BYTES,
  			    sinfo->tx_bytes);
  	if (sinfo->filled & STATION_INFO_LLID)
  		NLA_PUT_U16(msg, NL80211_STA_INFO_LLID,
  			    sinfo->llid);
  	if (sinfo->filled & STATION_INFO_PLID)
  		NLA_PUT_U16(msg, NL80211_STA_INFO_PLID,
  			    sinfo->plid);
  	if (sinfo->filled & STATION_INFO_PLINK_STATE)
  		NLA_PUT_U8(msg, NL80211_STA_INFO_PLINK_STATE,
  			    sinfo->plink_state);
  	if (sinfo->filled & STATION_INFO_SIGNAL)
  		NLA_PUT_U8(msg, NL80211_STA_INFO_SIGNAL,
  			   sinfo->signal);
  	if (sinfo->filled & STATION_INFO_TX_BITRATE) {
  		txrate = nla_nest_start(msg, NL80211_STA_INFO_TX_BITRATE);
  		if (!txrate)
  			goto nla_put_failure;
  
  		/* cfg80211_calculate_bitrate will return 0 for mcs >= 32 */
  		bitrate = cfg80211_calculate_bitrate(&sinfo->txrate);
  		if (bitrate > 0)
  			NLA_PUT_U16(msg, NL80211_RATE_INFO_BITRATE, bitrate);
  
  		if (sinfo->txrate.flags & RATE_INFO_FLAGS_MCS)
  			NLA_PUT_U8(msg, NL80211_RATE_INFO_MCS,
  				    sinfo->txrate.mcs);
  		if (sinfo->txrate.flags & RATE_INFO_FLAGS_40_MHZ_WIDTH)
  			NLA_PUT_FLAG(msg, NL80211_RATE_INFO_40_MHZ_WIDTH);
  		if (sinfo->txrate.flags & RATE_INFO_FLAGS_SHORT_GI)
  			NLA_PUT_FLAG(msg, NL80211_RATE_INFO_SHORT_GI);
  
  		nla_nest_end(msg, txrate);
  	}
  	if (sinfo->filled & STATION_INFO_RX_PACKETS)
  		NLA_PUT_U32(msg, NL80211_STA_INFO_RX_PACKETS,
  			    sinfo->rx_packets);
  	if (sinfo->filled & STATION_INFO_TX_PACKETS)
  		NLA_PUT_U32(msg, NL80211_STA_INFO_TX_PACKETS,
  			    sinfo->tx_packets);
  	nla_nest_end(msg, sinfoattr);
  
  	return genlmsg_end(msg, hdr);
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	return -EMSGSIZE;
  }
  
  static int nl80211_dump_station(struct sk_buff *skb,
  				struct netlink_callback *cb)
  {
  	struct station_info sinfo;
  	struct cfg80211_registered_device *dev;
  	struct net_device *netdev;
  	u8 mac_addr[ETH_ALEN];
  	int ifidx = cb->args[0];
  	int sta_idx = cb->args[1];
  	int err;
  
  	if (!ifidx) {
  		err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
  				  nl80211_fam.attrbuf, nl80211_fam.maxattr,
  				  nl80211_policy);
  		if (err)
  			return err;
  
  		if (!nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX])
  			return -EINVAL;
  
  		ifidx = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX]);
  		if (!ifidx)
  			return -EINVAL;
  	}
  
  	rtnl_lock();
  
  	netdev = __dev_get_by_index(sock_net(skb->sk), ifidx);
  	if (!netdev) {
  		err = -ENODEV;
  		goto out_rtnl;
  	}
  
  	dev = cfg80211_get_dev_from_ifindex(sock_net(skb->sk), ifidx);
  	if (IS_ERR(dev)) {
  		err = PTR_ERR(dev);
  		goto out_rtnl;
  	}
  
  	if (!dev->ops->dump_station) {
  		err = -EOPNOTSUPP;
  		goto out_err;
  	}
  
  	while (1) {
  		err = dev->ops->dump_station(&dev->wiphy, netdev, sta_idx,
  					     mac_addr, &sinfo);
  		if (err == -ENOENT)
  			break;
  		if (err)
  			goto out_err;
  
  		if (nl80211_send_station(skb,
  				NETLINK_CB(cb->skb).pid,
  				cb->nlh->nlmsg_seq, NLM_F_MULTI,
  				netdev, mac_addr,
  				&sinfo) < 0)
  			goto out;
  
  		sta_idx++;
  	}
  
  
   out:
  	cb->args[1] = sta_idx;
  	err = skb->len;
   out_err:
  	cfg80211_unlock_rdev(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_get_station(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	struct station_info sinfo;
  	struct sk_buff *msg;
  	u8 *mac_addr = NULL;
  
  	memset(&sinfo, 0, sizeof(sinfo));
  
  	if (!info->attrs[NL80211_ATTR_MAC])
  		return -EINVAL;
  
  	mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	if (!rdev->ops->get_station) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	err = rdev->ops->get_station(&rdev->wiphy, dev, mac_addr, &sinfo);
  	if (err)
  		goto out;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		goto out;
  
  	if (nl80211_send_station(msg, info->snd_pid, info->snd_seq, 0,
  				 dev, mac_addr, &sinfo) < 0)
  		goto out_free;
  
  	err = genlmsg_reply(msg, info);
  	goto out;
  
   out_free:
  	nlmsg_free(msg);
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  /*
   * Get vlan interface making sure it is on the right wiphy.
   */
  static int get_vlan(struct genl_info *info,
  		    struct cfg80211_registered_device *rdev,
  		    struct net_device **vlan)
  {
  	struct nlattr *vlanattr = info->attrs[NL80211_ATTR_STA_VLAN];
  	*vlan = NULL;
  
  	if (vlanattr) {
  		*vlan = dev_get_by_index(genl_info_net(info),
  					 nla_get_u32(vlanattr));
  		if (!*vlan)
  			return -ENODEV;
  		if (!(*vlan)->ieee80211_ptr)
  			return -EINVAL;
  		if ((*vlan)->ieee80211_ptr->wiphy != &rdev->wiphy)
  			return -EINVAL;
  	}
  	return 0;
  }
  
  static int nl80211_set_station(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	struct station_parameters params;
  	u8 *mac_addr = NULL;
  
  	memset(&params, 0, sizeof(params));
  
  	params.listen_interval = -1;
  
  	if (info->attrs[NL80211_ATTR_STA_AID])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_MAC])
  		return -EINVAL;
  
  	mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	if (info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]) {
  		params.supported_rates =
  			nla_data(info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]);
  		params.supported_rates_len =
  			nla_len(info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]);
  	}
  
  	if (info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL])
  		params.listen_interval =
  		    nla_get_u16(info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL]);
  
  	if (info->attrs[NL80211_ATTR_HT_CAPABILITY])
  		params.ht_capa =
  			nla_data(info->attrs[NL80211_ATTR_HT_CAPABILITY]);
  
  	if (parse_station_flags(info, &params))
  		return -EINVAL;
  
  	if (info->attrs[NL80211_ATTR_STA_PLINK_ACTION])
  		params.plink_action =
  		    nla_get_u8(info->attrs[NL80211_ATTR_STA_PLINK_ACTION]);
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	err = get_vlan(info, rdev, &params.vlan);
  	if (err)
  		goto out;
  
  	/* validate settings */
  	err = 0;
  
  	switch (dev->ieee80211_ptr->iftype) {
  	case NL80211_IFTYPE_AP:
  	case NL80211_IFTYPE_AP_VLAN:
  		/* disallow mesh-specific things */
  		if (params.plink_action)
  			err = -EINVAL;
  		break;
  	case NL80211_IFTYPE_STATION:
  		/* disallow everything but AUTHORIZED flag */
  		if (params.plink_action)
  			err = -EINVAL;
  		if (params.vlan)
  			err = -EINVAL;
  		if (params.supported_rates)
  			err = -EINVAL;
  		if (params.ht_capa)
  			err = -EINVAL;
  		if (params.listen_interval >= 0)
  			err = -EINVAL;
  		if (params.sta_flags_mask & ~BIT(NL80211_STA_FLAG_AUTHORIZED))
  			err = -EINVAL;
  		break;
  	case NL80211_IFTYPE_MESH_POINT:
  		/* disallow things mesh doesn't support */
  		if (params.vlan)
  			err = -EINVAL;
  		if (params.ht_capa)
  			err = -EINVAL;
  		if (params.listen_interval >= 0)
  			err = -EINVAL;
  		if (params.supported_rates)
  			err = -EINVAL;
  		if (params.sta_flags_mask)
  			err = -EINVAL;
  		break;
  	default:
  		err = -EINVAL;
  	}
  
  	if (err)
  		goto out;
  
  	if (!rdev->ops->change_station) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	err = rdev->ops->change_station(&rdev->wiphy, dev, mac_addr, &params);
  
   out:
  	if (params.vlan)
  		dev_put(params.vlan);
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	struct station_parameters params;
  	u8 *mac_addr = NULL;
  
  	memset(&params, 0, sizeof(params));
  
  	if (!info->attrs[NL80211_ATTR_MAC])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES])
  		return -EINVAL;
  
  	mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
  	params.supported_rates =
  		nla_data(info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]);
  	params.supported_rates_len =
  		nla_len(info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]);
  	params.listen_interval =
  		nla_get_u16(info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL]);
  
  	if (info->attrs[NL80211_ATTR_STA_AID]) {
  		params.aid = nla_get_u16(info->attrs[NL80211_ATTR_STA_AID]);
  		if (!params.aid || params.aid > IEEE80211_MAX_AID)
  			return -EINVAL;
  	}
  
  	if (info->attrs[NL80211_ATTR_HT_CAPABILITY])
  		params.ht_capa =
  			nla_data(info->attrs[NL80211_ATTR_HT_CAPABILITY]);
  
  	if (parse_station_flags(info, &params))
  		return -EINVAL;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	err = get_vlan(info, rdev, &params.vlan);
  	if (err)
  		goto out;
  
  	/* validate settings */
  	err = 0;
  
  	switch (dev->ieee80211_ptr->iftype) {
  	case NL80211_IFTYPE_AP:
  	case NL80211_IFTYPE_AP_VLAN:
  		/* all ok but must have AID */
  		if (!params.aid)
  			err = -EINVAL;
  		break;
  	case NL80211_IFTYPE_MESH_POINT:
  		/* disallow things mesh doesn't support */
  		if (params.vlan)
  			err = -EINVAL;
  		if (params.aid)
  			err = -EINVAL;
  		if (params.ht_capa)
  			err = -EINVAL;
  		if (params.listen_interval >= 0)
  			err = -EINVAL;
  		if (params.supported_rates)
  			err = -EINVAL;
  		if (params.sta_flags_mask)
  			err = -EINVAL;
  		break;
  	default:
  		err = -EINVAL;
  	}
  
  	if (err)
  		goto out;
  
  	if (!rdev->ops->add_station) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	err = rdev->ops->add_station(&rdev->wiphy, dev, mac_addr, &params);
  
   out:
  	if (params.vlan)
  		dev_put(params.vlan);
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_del_station(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	u8 *mac_addr = NULL;
  
  	if (info->attrs[NL80211_ATTR_MAC])
  		mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP &&
  	    dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP_VLAN &&
  	    dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	if (!rdev->ops->del_station) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	err = rdev->ops->del_station(&rdev->wiphy, dev, mac_addr);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_send_mpath(struct sk_buff *msg, u32 pid, u32 seq,
  				int flags, struct net_device *dev,
  				u8 *dst, u8 *next_hop,
  				struct mpath_info *pinfo)
  {
  	void *hdr;
  	struct nlattr *pinfoattr;
  
  	hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_STATION);
  	if (!hdr)
  		return -1;
  
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
  	NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, dst);
  	NLA_PUT(msg, NL80211_ATTR_MPATH_NEXT_HOP, ETH_ALEN, next_hop);
  
  	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION, pinfo->generation);
  
  	pinfoattr = nla_nest_start(msg, NL80211_ATTR_MPATH_INFO);
  	if (!pinfoattr)
  		goto nla_put_failure;
  	if (pinfo->filled & MPATH_INFO_FRAME_QLEN)
  		NLA_PUT_U32(msg, NL80211_MPATH_INFO_FRAME_QLEN,
  			    pinfo->frame_qlen);
  	if (pinfo->filled & MPATH_INFO_DSN)
  		NLA_PUT_U32(msg, NL80211_MPATH_INFO_DSN,
  			    pinfo->dsn);
  	if (pinfo->filled & MPATH_INFO_METRIC)
  		NLA_PUT_U32(msg, NL80211_MPATH_INFO_METRIC,
  			    pinfo->metric);
  	if (pinfo->filled & MPATH_INFO_EXPTIME)
  		NLA_PUT_U32(msg, NL80211_MPATH_INFO_EXPTIME,
  			    pinfo->exptime);
  	if (pinfo->filled & MPATH_INFO_FLAGS)
  		NLA_PUT_U8(msg, NL80211_MPATH_INFO_FLAGS,
  			    pinfo->flags);
  	if (pinfo->filled & MPATH_INFO_DISCOVERY_TIMEOUT)
  		NLA_PUT_U32(msg, NL80211_MPATH_INFO_DISCOVERY_TIMEOUT,
  			    pinfo->discovery_timeout);
  	if (pinfo->filled & MPATH_INFO_DISCOVERY_RETRIES)
  		NLA_PUT_U8(msg, NL80211_MPATH_INFO_DISCOVERY_RETRIES,
  			    pinfo->discovery_retries);
  
  	nla_nest_end(msg, pinfoattr);
  
  	return genlmsg_end(msg, hdr);
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	return -EMSGSIZE;
  }
  
  static int nl80211_dump_mpath(struct sk_buff *skb,
  			      struct netlink_callback *cb)
  {
  	struct mpath_info pinfo;
  	struct cfg80211_registered_device *dev;
  	struct net_device *netdev;
  	u8 dst[ETH_ALEN];
  	u8 next_hop[ETH_ALEN];
  	int ifidx = cb->args[0];
  	int path_idx = cb->args[1];
  	int err;
  
  	if (!ifidx) {
  		err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
  				  nl80211_fam.attrbuf, nl80211_fam.maxattr,
  				  nl80211_policy);
  		if (err)
  			return err;
  
  		if (!nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX])
  			return -EINVAL;
  
  		ifidx = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX]);
  		if (!ifidx)
  			return -EINVAL;
  	}
  
  	rtnl_lock();
  
  	netdev = __dev_get_by_index(sock_net(skb->sk), ifidx);
  	if (!netdev) {
  		err = -ENODEV;
  		goto out_rtnl;
  	}
  
  	dev = cfg80211_get_dev_from_ifindex(sock_net(skb->sk), ifidx);
  	if (IS_ERR(dev)) {
  		err = PTR_ERR(dev);
  		goto out_rtnl;
  	}
  
  	if (!dev->ops->dump_mpath) {
  		err = -EOPNOTSUPP;
  		goto out_err;
  	}
  
  	if (netdev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) {
  		err = -EOPNOTSUPP;
  		goto out_err;
  	}
  
  	while (1) {
  		err = dev->ops->dump_mpath(&dev->wiphy, netdev, path_idx,
  					   dst, next_hop, &pinfo);
  		if (err == -ENOENT)
  			break;
  		if (err)
  			goto out_err;
  
  		if (nl80211_send_mpath(skb, NETLINK_CB(cb->skb).pid,
  				       cb->nlh->nlmsg_seq, NLM_F_MULTI,
  				       netdev, dst, next_hop,
  				       &pinfo) < 0)
  			goto out;
  
  		path_idx++;
  	}
  
  
   out:
  	cb->args[1] = path_idx;
  	err = skb->len;
   out_err:
  	cfg80211_unlock_rdev(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_get_mpath(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	struct mpath_info pinfo;
  	struct sk_buff *msg;
  	u8 *dst = NULL;
  	u8 next_hop[ETH_ALEN];
  
  	memset(&pinfo, 0, sizeof(pinfo));
  
  	if (!info->attrs[NL80211_ATTR_MAC])
  		return -EINVAL;
  
  	dst = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	if (!rdev->ops->get_mpath) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	err = rdev->ops->get_mpath(&rdev->wiphy, dev, dst, next_hop, &pinfo);
  	if (err)
  		goto out;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		goto out;
  
  	if (nl80211_send_mpath(msg, info->snd_pid, info->snd_seq, 0,
  				 dev, dst, next_hop, &pinfo) < 0)
  		goto out_free;
  
  	err = genlmsg_reply(msg, info);
  	goto out;
  
   out_free:
  	nlmsg_free(msg);
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_set_mpath(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	u8 *dst = NULL;
  	u8 *next_hop = NULL;
  
  	if (!info->attrs[NL80211_ATTR_MAC])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_MPATH_NEXT_HOP])
  		return -EINVAL;
  
  	dst = nla_data(info->attrs[NL80211_ATTR_MAC]);
  	next_hop = nla_data(info->attrs[NL80211_ATTR_MPATH_NEXT_HOP]);
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	if (!rdev->ops->change_mpath) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	err = rdev->ops->change_mpath(&rdev->wiphy, dev, dst, next_hop);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  static int nl80211_new_mpath(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	u8 *dst = NULL;
  	u8 *next_hop = NULL;
  
  	if (!info->attrs[NL80211_ATTR_MAC])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_MPATH_NEXT_HOP])
  		return -EINVAL;
  
  	dst = nla_data(info->attrs[NL80211_ATTR_MAC]);
  	next_hop = nla_data(info->attrs[NL80211_ATTR_MPATH_NEXT_HOP]);
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	if (!rdev->ops->add_mpath) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	err = rdev->ops->add_mpath(&rdev->wiphy, dev, dst, next_hop);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_del_mpath(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	u8 *dst = NULL;
  
  	if (info->attrs[NL80211_ATTR_MAC])
  		dst = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	if (!rdev->ops->del_mpath) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	err = rdev->ops->del_mpath(&rdev->wiphy, dev, dst);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_set_bss(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  	struct net_device *dev;
  	struct bss_parameters params;
  
  	memset(&params, 0, sizeof(params));
  	/* default to not changing parameters */
  	params.use_cts_prot = -1;
  	params.use_short_preamble = -1;
  	params.use_short_slot_time = -1;
  
  	if (info->attrs[NL80211_ATTR_BSS_CTS_PROT])
  		params.use_cts_prot =
  		    nla_get_u8(info->attrs[NL80211_ATTR_BSS_CTS_PROT]);
  	if (info->attrs[NL80211_ATTR_BSS_SHORT_PREAMBLE])
  		params.use_short_preamble =
  		    nla_get_u8(info->attrs[NL80211_ATTR_BSS_SHORT_PREAMBLE]);
  	if (info->attrs[NL80211_ATTR_BSS_SHORT_SLOT_TIME])
  		params.use_short_slot_time =
  		    nla_get_u8(info->attrs[NL80211_ATTR_BSS_SHORT_SLOT_TIME]);
  	if (info->attrs[NL80211_ATTR_BSS_BASIC_RATES]) {
  		params.basic_rates =
  			nla_data(info->attrs[NL80211_ATTR_BSS_BASIC_RATES]);
  		params.basic_rates_len =
  			nla_len(info->attrs[NL80211_ATTR_BSS_BASIC_RATES]);
  	}
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	if (!rdev->ops->change_bss) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	err = rdev->ops->change_bss(&rdev->wiphy, dev, &params);
  
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static const struct nla_policy
  	reg_rule_policy[NL80211_REG_RULE_ATTR_MAX + 1] = {
  	[NL80211_ATTR_REG_RULE_FLAGS]		= { .type = NLA_U32 },
  	[NL80211_ATTR_FREQ_RANGE_START]		= { .type = NLA_U32 },
  	[NL80211_ATTR_FREQ_RANGE_END]		= { .type = NLA_U32 },
  	[NL80211_ATTR_FREQ_RANGE_MAX_BW]	= { .type = NLA_U32 },
  	[NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN]	= { .type = NLA_U32 },
  	[NL80211_ATTR_POWER_RULE_MAX_EIRP]	= { .type = NLA_U32 },
  };
  
  static int parse_reg_rule(struct nlattr *tb[],
  	struct ieee80211_reg_rule *reg_rule)
  {
  	struct ieee80211_freq_range *freq_range = &reg_rule->freq_range;
  	struct ieee80211_power_rule *power_rule = &reg_rule->power_rule;
  
  	if (!tb[NL80211_ATTR_REG_RULE_FLAGS])
  		return -EINVAL;
  	if (!tb[NL80211_ATTR_FREQ_RANGE_START])
  		return -EINVAL;
  	if (!tb[NL80211_ATTR_FREQ_RANGE_END])
  		return -EINVAL;
  	if (!tb[NL80211_ATTR_FREQ_RANGE_MAX_BW])
  		return -EINVAL;
  	if (!tb[NL80211_ATTR_POWER_RULE_MAX_EIRP])
  		return -EINVAL;
  
  	reg_rule->flags = nla_get_u32(tb[NL80211_ATTR_REG_RULE_FLAGS]);
  
  	freq_range->start_freq_khz =
  		nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_START]);
  	freq_range->end_freq_khz =
  		nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_END]);
  	freq_range->max_bandwidth_khz =
  		nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_MAX_BW]);
  
  	power_rule->max_eirp =
  		nla_get_u32(tb[NL80211_ATTR_POWER_RULE_MAX_EIRP]);
  
  	if (tb[NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN])
  		power_rule->max_antenna_gain =
  			nla_get_u32(tb[NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN]);
  
  	return 0;
  }
  
  static int nl80211_req_set_reg(struct sk_buff *skb, struct genl_info *info)
  {
  	int r;
  	char *data = NULL;
  
  	/*
  	 * You should only get this when cfg80211 hasn't yet initialized
  	 * completely when built-in to the kernel right between the time
  	 * window between nl80211_init() and regulatory_init(), if that is
  	 * even possible.
  	 */
  	mutex_lock(&cfg80211_mutex);
  	if (unlikely(!cfg80211_regdomain)) {
  		mutex_unlock(&cfg80211_mutex);
  		return -EINPROGRESS;
  	}
  	mutex_unlock(&cfg80211_mutex);
  
  	if (!info->attrs[NL80211_ATTR_REG_ALPHA2])
  		return -EINVAL;
  
  	data = nla_data(info->attrs[NL80211_ATTR_REG_ALPHA2]);
  
  #ifdef CONFIG_WIRELESS_OLD_REGULATORY
  	/* We ignore world regdom requests with the old regdom setup */
  	if (is_world_regdom(data))
  		return -EINVAL;
  #endif
  
  	r = regulatory_hint_user(data);
  
  	return r;
  }
  
  static int nl80211_get_mesh_params(struct sk_buff *skb,
  	struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct mesh_config cur_params;
  	int err;
  	struct net_device *dev;
  	void *hdr;
  	struct nlattr *pinfoattr;
  	struct sk_buff *msg;
  
  	rtnl_lock();
  
  	/* Look up our device */
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	if (!rdev->ops->get_mesh_params) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	/* Get the mesh params */
  	err = rdev->ops->get_mesh_params(&rdev->wiphy, dev, &cur_params);
  	if (err)
  		goto out;
  
  	/* Draw up a netlink message to send back */
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg) {
  		err = -ENOBUFS;
  		goto out;
  	}
  	hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,
  			     NL80211_CMD_GET_MESH_PARAMS);
  	if (!hdr)
  		goto nla_put_failure;
  	pinfoattr = nla_nest_start(msg, NL80211_ATTR_MESH_PARAMS);
  	if (!pinfoattr)
  		goto nla_put_failure;
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
  	NLA_PUT_U16(msg, NL80211_MESHCONF_RETRY_TIMEOUT,
  			cur_params.dot11MeshRetryTimeout);
  	NLA_PUT_U16(msg, NL80211_MESHCONF_CONFIRM_TIMEOUT,
  			cur_params.dot11MeshConfirmTimeout);
  	NLA_PUT_U16(msg, NL80211_MESHCONF_HOLDING_TIMEOUT,
  			cur_params.dot11MeshHoldingTimeout);
  	NLA_PUT_U16(msg, NL80211_MESHCONF_MAX_PEER_LINKS,
  			cur_params.dot11MeshMaxPeerLinks);
  	NLA_PUT_U8(msg, NL80211_MESHCONF_MAX_RETRIES,
  			cur_params.dot11MeshMaxRetries);
  	NLA_PUT_U8(msg, NL80211_MESHCONF_TTL,
  			cur_params.dot11MeshTTL);
  	NLA_PUT_U8(msg, NL80211_MESHCONF_AUTO_OPEN_PLINKS,
  			cur_params.auto_open_plinks);
  	NLA_PUT_U8(msg, NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
  			cur_params.dot11MeshHWMPmaxPREQretries);
  	NLA_PUT_U32(msg, NL80211_MESHCONF_PATH_REFRESH_TIME,
  			cur_params.path_refresh_time);
  	NLA_PUT_U16(msg, NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
  			cur_params.min_discovery_timeout);
  	NLA_PUT_U32(msg, NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
  			cur_params.dot11MeshHWMPactivePathTimeout);
  	NLA_PUT_U16(msg, NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
  			cur_params.dot11MeshHWMPpreqMinInterval);
  	NLA_PUT_U16(msg, NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
  			cur_params.dot11MeshHWMPnetDiameterTraversalTime);
  	nla_nest_end(msg, pinfoattr);
  	genlmsg_end(msg, hdr);
  	err = genlmsg_reply(msg, info);
  	goto out;
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	err = -EMSGSIZE;
   out:
  	/* Cleanup */
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  #define FILL_IN_MESH_PARAM_IF_SET(table, cfg, param, mask, attr_num, nla_fn) \
  do {\
  	if (table[attr_num]) {\
  		cfg.param = nla_fn(table[attr_num]); \
  		mask |= (1 << (attr_num - 1)); \
  	} \
  } while (0);\
  
  static struct nla_policy
  nl80211_meshconf_params_policy[NL80211_MESHCONF_ATTR_MAX+1] __read_mostly = {
  	[NL80211_MESHCONF_RETRY_TIMEOUT] = { .type = NLA_U16 },
  	[NL80211_MESHCONF_CONFIRM_TIMEOUT] = { .type = NLA_U16 },
  	[NL80211_MESHCONF_HOLDING_TIMEOUT] = { .type = NLA_U16 },
  	[NL80211_MESHCONF_MAX_PEER_LINKS] = { .type = NLA_U16 },
  	[NL80211_MESHCONF_MAX_RETRIES] = { .type = NLA_U8 },
  	[NL80211_MESHCONF_TTL] = { .type = NLA_U8 },
  	[NL80211_MESHCONF_AUTO_OPEN_PLINKS] = { .type = NLA_U8 },
  
  	[NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES] = { .type = NLA_U8 },
  	[NL80211_MESHCONF_PATH_REFRESH_TIME] = { .type = NLA_U32 },
  	[NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT] = { .type = NLA_U16 },
  	[NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT] = { .type = NLA_U32 },
  	[NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL] = { .type = NLA_U16 },
  	[NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME] = { .type = NLA_U16 },
  };
  
  static int nl80211_set_mesh_params(struct sk_buff *skb, struct genl_info *info)
  {
  	int err;
  	u32 mask;
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	struct mesh_config cfg;
  	struct nlattr *tb[NL80211_MESHCONF_ATTR_MAX + 1];
  	struct nlattr *parent_attr;
  
  	parent_attr = info->attrs[NL80211_ATTR_MESH_PARAMS];
  	if (!parent_attr)
  		return -EINVAL;
  	if (nla_parse_nested(tb, NL80211_MESHCONF_ATTR_MAX,
  			parent_attr, nl80211_meshconf_params_policy))
  		return -EINVAL;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	if (!rdev->ops->set_mesh_params) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	/* This makes sure that there aren't more than 32 mesh config
  	 * parameters (otherwise our bitfield scheme would not work.) */
  	BUILD_BUG_ON(NL80211_MESHCONF_ATTR_MAX > 32);
  
  	/* Fill in the params struct */
  	mask = 0;
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshRetryTimeout,
  			mask, NL80211_MESHCONF_RETRY_TIMEOUT, nla_get_u16);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshConfirmTimeout,
  			mask, NL80211_MESHCONF_CONFIRM_TIMEOUT, nla_get_u16);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHoldingTimeout,
  			mask, NL80211_MESHCONF_HOLDING_TIMEOUT, nla_get_u16);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshMaxPeerLinks,
  			mask, NL80211_MESHCONF_MAX_PEER_LINKS, nla_get_u16);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshMaxRetries,
  			mask, NL80211_MESHCONF_MAX_RETRIES, nla_get_u8);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshTTL,
  			mask, NL80211_MESHCONF_TTL, nla_get_u8);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, auto_open_plinks,
  			mask, NL80211_MESHCONF_AUTO_OPEN_PLINKS, nla_get_u8);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPmaxPREQretries,
  			mask, NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
  			nla_get_u8);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, path_refresh_time,
  			mask, NL80211_MESHCONF_PATH_REFRESH_TIME, nla_get_u32);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, min_discovery_timeout,
  			mask, NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
  			nla_get_u16);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPactivePathTimeout,
  			mask, NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
  			nla_get_u32);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPpreqMinInterval,
  			mask, NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
  			nla_get_u16);
  	FILL_IN_MESH_PARAM_IF_SET(tb, cfg,
  			dot11MeshHWMPnetDiameterTraversalTime,
  			mask, NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
  			nla_get_u16);
  
  	/* Apply changes */
  	err = rdev->ops->set_mesh_params(&rdev->wiphy, dev, &cfg, mask);
  
   out:
  	/* cleanup */
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  #undef FILL_IN_MESH_PARAM_IF_SET
  
  static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
  {
  	struct sk_buff *msg;
  	void *hdr = NULL;
  	struct nlattr *nl_reg_rules;
  	unsigned int i;
  	int err = -EINVAL;
  
  	mutex_lock(&cfg80211_mutex);
  
  	if (!cfg80211_regdomain)
  		goto out;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg) {
  		err = -ENOBUFS;
  		goto out;
  	}
  
  	hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,
  			     NL80211_CMD_GET_REG);
  	if (!hdr)
  		goto nla_put_failure;
  
  	NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2,
  		cfg80211_regdomain->alpha2);
  
  	nl_reg_rules = nla_nest_start(msg, NL80211_ATTR_REG_RULES);
  	if (!nl_reg_rules)
  		goto nla_put_failure;
  
  	for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) {
  		struct nlattr *nl_reg_rule;
  		const struct ieee80211_reg_rule *reg_rule;
  		const struct ieee80211_freq_range *freq_range;
  		const struct ieee80211_power_rule *power_rule;
  
  		reg_rule = &cfg80211_regdomain->reg_rules[i];
  		freq_range = &reg_rule->freq_range;
  		power_rule = &reg_rule->power_rule;
  
  		nl_reg_rule = nla_nest_start(msg, i);
  		if (!nl_reg_rule)
  			goto nla_put_failure;
  
  		NLA_PUT_U32(msg, NL80211_ATTR_REG_RULE_FLAGS,
  			reg_rule->flags);
  		NLA_PUT_U32(msg, NL80211_ATTR_FREQ_RANGE_START,
  			freq_range->start_freq_khz);
  		NLA_PUT_U32(msg, NL80211_ATTR_FREQ_RANGE_END,
  			freq_range->end_freq_khz);
  		NLA_PUT_U32(msg, NL80211_ATTR_FREQ_RANGE_MAX_BW,
  			freq_range->max_bandwidth_khz);
  		NLA_PUT_U32(msg, NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN,
  			power_rule->max_antenna_gain);
  		NLA_PUT_U32(msg, NL80211_ATTR_POWER_RULE_MAX_EIRP,
  			power_rule->max_eirp);
  
  		nla_nest_end(msg, nl_reg_rule);
  	}
  
  	nla_nest_end(msg, nl_reg_rules);
  
  	genlmsg_end(msg, hdr);
  	err = genlmsg_reply(msg, info);
  	goto out;
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	err = -EMSGSIZE;
  out:
  	mutex_unlock(&cfg80211_mutex);
  	return err;
  }
  
  static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
  {
  	struct nlattr *tb[NL80211_REG_RULE_ATTR_MAX + 1];
  	struct nlattr *nl_reg_rule;
  	char *alpha2 = NULL;
  	int rem_reg_rules = 0, r = 0;
  	u32 num_rules = 0, rule_idx = 0, size_of_regd;
  	struct ieee80211_regdomain *rd = NULL;
  
  	if (!info->attrs[NL80211_ATTR_REG_ALPHA2])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_REG_RULES])
  		return -EINVAL;
  
  	alpha2 = nla_data(info->attrs[NL80211_ATTR_REG_ALPHA2]);
  
  	nla_for_each_nested(nl_reg_rule, info->attrs[NL80211_ATTR_REG_RULES],
  			rem_reg_rules) {
  		num_rules++;
  		if (num_rules > NL80211_MAX_SUPP_REG_RULES)
  			return -EINVAL;
  	}
  
  	mutex_lock(&cfg80211_mutex);
  
  	if (!reg_is_valid_request(alpha2)) {
  		r = -EINVAL;
  		goto bad_reg;
  	}
  
  	size_of_regd = sizeof(struct ieee80211_regdomain) +
  		(num_rules * sizeof(struct ieee80211_reg_rule));
  
  	rd = kzalloc(size_of_regd, GFP_KERNEL);
  	if (!rd) {
  		r = -ENOMEM;
  		goto bad_reg;
  	}
  
  	rd->n_reg_rules = num_rules;
  	rd->alpha2[0] = alpha2[0];
  	rd->alpha2[1] = alpha2[1];
  
  	nla_for_each_nested(nl_reg_rule, info->attrs[NL80211_ATTR_REG_RULES],
  			rem_reg_rules) {
  		nla_parse(tb, NL80211_REG_RULE_ATTR_MAX,
  			nla_data(nl_reg_rule), nla_len(nl_reg_rule),
  			reg_rule_policy);
  		r = parse_reg_rule(tb, &rd->reg_rules[rule_idx]);
  		if (r)
  			goto bad_reg;
  
  		rule_idx++;
  
  		if (rule_idx > NL80211_MAX_SUPP_REG_RULES) {
  			r = -EINVAL;
  			goto bad_reg;
  		}
  	}
  
  	BUG_ON(rule_idx != num_rules);
  
  	r = set_regdom(rd);
  
  	mutex_unlock(&cfg80211_mutex);
  
  	return r;
  
   bad_reg:
  	mutex_unlock(&cfg80211_mutex);
  	kfree(rd);
  	return r;
  }
  
  static int validate_scan_freqs(struct nlattr *freqs)
  {
  	struct nlattr *attr1, *attr2;
  	int n_channels = 0, tmp1, tmp2;
  
  	nla_for_each_nested(attr1, freqs, tmp1) {
  		n_channels++;
  		/*
  		 * Some hardware has a limited channel list for
  		 * scanning, and it is pretty much nonsensical
  		 * to scan for a channel twice, so disallow that
  		 * and don't require drivers to check that the
  		 * channel list they get isn't longer than what
  		 * they can scan, as long as they can scan all
  		 * the channels they registered at once.
  		 */
  		nla_for_each_nested(attr2, freqs, tmp2)
  			if (attr1 != attr2 &&
  			    nla_get_u32(attr1) == nla_get_u32(attr2))
  				return 0;
  	}
  
  	return n_channels;
  }
  
  static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	struct cfg80211_scan_request *request;
  	struct cfg80211_ssid *ssid;
  	struct ieee80211_channel *channel;
  	struct nlattr *attr;
  	struct wiphy *wiphy;
  	int err, tmp, n_ssids = 0, n_channels, i;
  	enum ieee80211_band band;
  	size_t ie_len;
  
  	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
  		return -EINVAL;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto out_rtnl;
  
  	wiphy = &rdev->wiphy;
  
  	if (!rdev->ops->scan) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	if (rdev->scan_req) {
  		err = -EBUSY;
  		goto out;
  	}
  
  	if (info->attrs[NL80211_ATTR_SCAN_FREQUENCIES]) {
  		n_channels = validate_scan_freqs(
  				info->attrs[NL80211_ATTR_SCAN_FREQUENCIES]);
  		if (!n_channels) {
  			err = -EINVAL;
  			goto out;
  		}
  	} else {
  		n_channels = 0;
  
  		for (band = 0; band < IEEE80211_NUM_BANDS; band++)
  			if (wiphy->bands[band])
  				n_channels += wiphy->bands[band]->n_channels;
  	}
  
  	if (info->attrs[NL80211_ATTR_SCAN_SSIDS])
  		nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS], tmp)
  			n_ssids++;
  
  	if (n_ssids > wiphy->max_scan_ssids) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	if (info->attrs[NL80211_ATTR_IE])
  		ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
  	else
  		ie_len = 0;
  
  	if (ie_len > wiphy->max_scan_ie_len) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	request = kzalloc(sizeof(*request)
  			+ sizeof(*ssid) * n_ssids
  			+ sizeof(channel) * n_channels
  			+ ie_len, GFP_KERNEL);
  	if (!request) {
  		err = -ENOMEM;
  		goto out;
  	}
  
  	request->n_channels = n_channels;
  	if (n_ssids)
  		request->ssids = (void *)&request->channels[n_channels];
  	request->n_ssids = n_ssids;
  	if (ie_len) {
  		if (request->ssids)
  			request->ie = (void *)(request->ssids + n_ssids);
  		else
  			request->ie = (void *)(request->channels + n_channels);
  	}
  
  	if (info->attrs[NL80211_ATTR_SCAN_FREQUENCIES]) {
  		/* user specified, bail out if channel not found */
  		request->n_channels = n_channels;
  		i = 0;
  		nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_FREQUENCIES], tmp) {
  			request->channels[i] = ieee80211_get_channel(wiphy, nla_get_u32(attr));
  			if (!request->channels[i]) {
  				err = -EINVAL;
  				goto out_free;
  			}
  			i++;
  		}
  	} else {
  		/* all channels */
  		i = 0;
  		for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  			int j;
  			if (!wiphy->bands[band])
  				continue;
  			for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
  				request->channels[i] = &wiphy->bands[band]->channels[j];
  				i++;
  			}
  		}
  	}
  
  	i = 0;
  	if (info->attrs[NL80211_ATTR_SCAN_SSIDS]) {
  		nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS], tmp) {
  			if (request->ssids[i].ssid_len > IEEE80211_MAX_SSID_LEN) {
  				err = -EINVAL;
  				goto out_free;
  			}
  			memcpy(request->ssids[i].ssid, nla_data(attr), nla_len(attr));
  			request->ssids[i].ssid_len = nla_len(attr);
  			i++;
  		}
  	}
  
  	if (info->attrs[NL80211_ATTR_IE]) {
  		request->ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
  		memcpy((void *)request->ie,
  		       nla_data(info->attrs[NL80211_ATTR_IE]),
  		       request->ie_len);
  	}
  
  	request->dev = dev;
  	request->wiphy = &rdev->wiphy;
  
  	rdev->scan_req = request;
  	err = rdev->ops->scan(&rdev->wiphy, dev, request);
  
  	if (!err) {
  		nl80211_send_scan_start(rdev, dev);
  		dev_hold(dev);
  	}
  
   out_free:
  	if (err) {
  		rdev->scan_req = NULL;
  		kfree(request);
  	}
   out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
   out_rtnl:
  	rtnl_unlock();
  
  	return err;
  }
  
  static int nl80211_send_bss(struct sk_buff *msg, u32 pid, u32 seq, int flags,
  			    struct cfg80211_registered_device *rdev,
  			    struct wireless_dev *wdev,
  			    struct cfg80211_internal_bss *intbss)
  {
  	struct cfg80211_bss *res = &intbss->pub;
  	void *hdr;
  	struct nlattr *bss;
  	int i;
  
  	ASSERT_WDEV_LOCK(wdev);
  
  	hdr = nl80211hdr_put(msg, pid, seq, flags,
  			     NL80211_CMD_NEW_SCAN_RESULTS);
  	if (!hdr)
  		return -1;
  
  	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION, rdev->bss_generation);
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, wdev->netdev->ifindex);
  
  	bss = nla_nest_start(msg, NL80211_ATTR_BSS);
  	if (!bss)
  		goto nla_put_failure;
  	if (!is_zero_ether_addr(res->bssid))
  		NLA_PUT(msg, NL80211_BSS_BSSID, ETH_ALEN, res->bssid);
  	if (res->information_elements && res->len_information_elements)
  		NLA_PUT(msg, NL80211_BSS_INFORMATION_ELEMENTS,
  			res->len_information_elements,
  			res->information_elements);
  	if (res->tsf)
  		NLA_PUT_U64(msg, NL80211_BSS_TSF, res->tsf);
  	if (res->beacon_interval)
  		NLA_PUT_U16(msg, NL80211_BSS_BEACON_INTERVAL, res->beacon_interval);
  	NLA_PUT_U16(msg, NL80211_BSS_CAPABILITY, res->capability);
  	NLA_PUT_U32(msg, NL80211_BSS_FREQUENCY, res->channel->center_freq);
  
  	switch (rdev->wiphy.signal_type) {
  	case CFG80211_SIGNAL_TYPE_MBM:
  		NLA_PUT_U32(msg, NL80211_BSS_SIGNAL_MBM, res->signal);
  		break;
  	case CFG80211_SIGNAL_TYPE_UNSPEC:
  		NLA_PUT_U8(msg, NL80211_BSS_SIGNAL_UNSPEC, res->signal);
  		break;
  	default:
  		break;
  	}
  
  	switch (wdev->iftype) {
  	case NL80211_IFTYPE_STATION:
  		if (intbss == wdev->current_bss)
  			NLA_PUT_U32(msg, NL80211_BSS_STATUS,
  				    NL80211_BSS_STATUS_ASSOCIATED);
  		else for (i = 0; i < MAX_AUTH_BSSES; i++) {
  			if (intbss != wdev->auth_bsses[i])
  				continue;
  			NLA_PUT_U32(msg, NL80211_BSS_STATUS,
  				    NL80211_BSS_STATUS_AUTHENTICATED);
  			break;
  		}
  		break;
  	case NL80211_IFTYPE_ADHOC:
  		if (intbss == wdev->current_bss)
  			NLA_PUT_U32(msg, NL80211_BSS_STATUS,
  				    NL80211_BSS_STATUS_IBSS_JOINED);
  		break;
  	default:
  		break;
  	}
  
  	nla_nest_end(msg, bss);
  
  	return genlmsg_end(msg, hdr);
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	return -EMSGSIZE;
  }
  
  static int nl80211_dump_scan(struct sk_buff *skb,
  			     struct netlink_callback *cb)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	struct cfg80211_internal_bss *scan;
  	struct wireless_dev *wdev;
  	int ifidx = cb->args[0];
  	int start = cb->args[1], idx = 0;
  	int err;
  
  	if (!ifidx) {
  		err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
  				  nl80211_fam.attrbuf, nl80211_fam.maxattr,
  				  nl80211_policy);
  		if (err)
  			return err;
  
  		if (!nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX])
  			return -EINVAL;
  
  		ifidx = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX]);
  		if (!ifidx)
  			return -EINVAL;
  		cb->args[0] = ifidx;
  	}
  
  	dev = dev_get_by_index(sock_net(skb->sk), ifidx);
  	if (!dev)
  		return -ENODEV;
  
  	rdev = cfg80211_get_dev_from_ifindex(sock_net(skb->sk), ifidx);
  	if (IS_ERR(rdev)) {
  		err = PTR_ERR(rdev);
  		goto out_put_netdev;
  	}
  
  	wdev = dev->ieee80211_ptr;
  
  	wdev_lock(wdev);
  	spin_lock_bh(&rdev->bss_lock);
  	cfg80211_bss_expire(rdev);
  
  	list_for_each_entry(scan, &rdev->bss_list, list) {
  		if (++idx <= start)
  			continue;
  		if (nl80211_send_bss(skb,
  				NETLINK_CB(cb->skb).pid,
  				cb->nlh->nlmsg_seq, NLM_F_MULTI,
  				rdev, wdev, scan) < 0) {
  			idx--;
  			goto out;
  		}
  	}
  
   out:
  	spin_unlock_bh(&rdev->bss_lock);
  	wdev_unlock(wdev);
  
  	cb->args[1] = idx;
  	err = skb->len;
  	cfg80211_unlock_rdev(rdev);
   out_put_netdev:
  	dev_put(dev);
  
  	return err;
  }
  
  static bool nl80211_valid_auth_type(enum nl80211_auth_type auth_type)
  {
  	return auth_type <= NL80211_AUTHTYPE_MAX;
  }
  
  static bool nl80211_valid_wpa_versions(u32 wpa_versions)
  {
  	return !(wpa_versions & ~(NL80211_WPA_VERSION_1 |
  				  NL80211_WPA_VERSION_2));
  }
  
  static bool nl80211_valid_akm_suite(u32 akm)
  {
  	return akm == WLAN_AKM_SUITE_8021X ||
  		akm == WLAN_AKM_SUITE_PSK;
  }
  
  static bool nl80211_valid_cipher_suite(u32 cipher)
  {
  	return cipher == WLAN_CIPHER_SUITE_WEP40 ||
  		cipher == WLAN_CIPHER_SUITE_WEP104 ||
  		cipher == WLAN_CIPHER_SUITE_TKIP ||
  		cipher == WLAN_CIPHER_SUITE_CCMP ||
  		cipher == WLAN_CIPHER_SUITE_AES_CMAC;
  }
  
  
  static int nl80211_authenticate(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	struct ieee80211_channel *chan;
  	const u8 *bssid, *ssid, *ie = NULL;
  	int err, ssid_len, ie_len = 0;
  	enum nl80211_auth_type auth_type;
  	struct key_parse key;
  
  	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_MAC])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_AUTH_TYPE])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_SSID])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_WIPHY_FREQ])
  		return -EINVAL;
  
  	err = nl80211_parse_key(info, &key);
  	if (err)
  		return err;
  
  	if (key.idx >= 0) {
  		if (!key.p.key || !key.p.key_len)
  			return -EINVAL;
  		if ((key.p.cipher != WLAN_CIPHER_SUITE_WEP40 ||
  		     key.p.key_len != WLAN_KEY_LEN_WEP40) &&
  		    (key.p.cipher != WLAN_CIPHER_SUITE_WEP104 ||
  		     key.p.key_len != WLAN_KEY_LEN_WEP104))
  			return -EINVAL;
  		if (key.idx > 4)
  			return -EINVAL;
  	} else {
  		key.p.key_len = 0;
  		key.p.key = NULL;
  	}
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->auth) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
  	chan = ieee80211_get_channel(&rdev->wiphy,
  		nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]));
  	if (!chan || (chan->flags & IEEE80211_CHAN_DISABLED)) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
  	ssid_len = nla_len(info->attrs[NL80211_ATTR_SSID]);
  
  	if (info->attrs[NL80211_ATTR_IE]) {
  		ie = nla_data(info->attrs[NL80211_ATTR_IE]);
  		ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
  	}
  
  	auth_type = nla_get_u32(info->attrs[NL80211_ATTR_AUTH_TYPE]);
  	if (!nl80211_valid_auth_type(auth_type)) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	err = cfg80211_mlme_auth(rdev, dev, chan, auth_type, bssid,
  				 ssid, ssid_len, ie, ie_len,
  				 key.p.key, key.p.key_len, key.idx);
  
  out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
  unlock_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  static int nl80211_crypto_settings(struct genl_info *info,
  				   struct cfg80211_crypto_settings *settings,
  				   int cipher_limit)
  {
  	memset(settings, 0, sizeof(*settings));
  
  	settings->control_port = info->attrs[NL80211_ATTR_CONTROL_PORT];
  
  	if (info->attrs[NL80211_ATTR_CIPHER_SUITES_PAIRWISE]) {
  		void *data;
  		int len, i;
  
  		data = nla_data(info->attrs[NL80211_ATTR_CIPHER_SUITES_PAIRWISE]);
  		len = nla_len(info->attrs[NL80211_ATTR_CIPHER_SUITES_PAIRWISE]);
  		settings->n_ciphers_pairwise = len / sizeof(u32);
  
  		if (len % sizeof(u32))
  			return -EINVAL;
  
  		if (settings->n_ciphers_pairwise > cipher_limit)
  			return -EINVAL;
  
  		memcpy(settings->ciphers_pairwise, data, len);
  
  		for (i = 0; i < settings->n_ciphers_pairwise; i++)
  			if (!nl80211_valid_cipher_suite(
  					settings->ciphers_pairwise[i]))
  				return -EINVAL;
  	}
  
  	if (info->attrs[NL80211_ATTR_CIPHER_SUITE_GROUP]) {
  		settings->cipher_group =
  			nla_get_u32(info->attrs[NL80211_ATTR_CIPHER_SUITE_GROUP]);
  		if (!nl80211_valid_cipher_suite(settings->cipher_group))
  			return -EINVAL;
  	}
  
  	if (info->attrs[NL80211_ATTR_WPA_VERSIONS]) {
  		settings->wpa_versions =
  			nla_get_u32(info->attrs[NL80211_ATTR_WPA_VERSIONS]);
  		if (!nl80211_valid_wpa_versions(settings->wpa_versions))
  			return -EINVAL;
  	}
  
  	if (info->attrs[NL80211_ATTR_AKM_SUITES]) {
  		void *data;
  		int len, i;
  
  		data = nla_data(info->attrs[NL80211_ATTR_AKM_SUITES]);
  		len = nla_len(info->attrs[NL80211_ATTR_AKM_SUITES]);
  		settings->n_akm_suites = len / sizeof(u32);
  
  		if (len % sizeof(u32))
  			return -EINVAL;
  
  		memcpy(settings->akm_suites, data, len);
  
  		for (i = 0; i < settings->n_ciphers_pairwise; i++)
  			if (!nl80211_valid_akm_suite(settings->akm_suites[i]))
  				return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int nl80211_associate(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	struct cfg80211_crypto_settings crypto;
  	struct ieee80211_channel *chan, *fixedchan;
  	const u8 *bssid, *ssid, *ie = NULL, *prev_bssid = NULL;
  	int err, ssid_len, ie_len = 0;
  	bool use_mfp = false;
  
  	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_MAC] ||
  	    !info->attrs[NL80211_ATTR_SSID] ||
  	    !info->attrs[NL80211_ATTR_WIPHY_FREQ])
  		return -EINVAL;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->assoc) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	chan = ieee80211_get_channel(&rdev->wiphy,
  		nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]));
  	if (!chan || (chan->flags & IEEE80211_CHAN_DISABLED)) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	mutex_lock(&rdev->devlist_mtx);
  	fixedchan = rdev_fixed_channel(rdev, NULL);
  	if (fixedchan && chan != fixedchan) {
  		err = -EBUSY;
  		mutex_unlock(&rdev->devlist_mtx);
  		goto out;
  	}
  	mutex_unlock(&rdev->devlist_mtx);
  
  	ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
  	ssid_len = nla_len(info->attrs[NL80211_ATTR_SSID]);
  
  	if (info->attrs[NL80211_ATTR_IE]) {
  		ie = nla_data(info->attrs[NL80211_ATTR_IE]);
  		ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
  	}
  
  	if (info->attrs[NL80211_ATTR_USE_MFP]) {
  		enum nl80211_mfp mfp =
  			nla_get_u32(info->attrs[NL80211_ATTR_USE_MFP]);
  		if (mfp == NL80211_MFP_REQUIRED)
  			use_mfp = true;
  		else if (mfp != NL80211_MFP_NO) {
  			err = -EINVAL;
  			goto out;
  		}
  	}
  
  	if (info->attrs[NL80211_ATTR_PREV_BSSID])
  		prev_bssid = nla_data(info->attrs[NL80211_ATTR_PREV_BSSID]);
  
  	err = nl80211_crypto_settings(info, &crypto, 1);
  	if (!err)
  		err = cfg80211_mlme_assoc(rdev, dev, chan, bssid, prev_bssid,
  					  ssid, ssid_len, ie, ie_len, use_mfp,
  					  &crypto);
  
  out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
  unlock_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  static int nl80211_deauthenticate(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	const u8 *ie = NULL, *bssid;
  	int err, ie_len = 0;
  	u16 reason_code;
  
  	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_MAC])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_REASON_CODE])
  		return -EINVAL;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->deauth) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	reason_code = nla_get_u16(info->attrs[NL80211_ATTR_REASON_CODE]);
  	if (reason_code == 0) {
  		/* Reason Code 0 is reserved */
  		err = -EINVAL;
  		goto out;
  	}
  
  	if (info->attrs[NL80211_ATTR_IE]) {
  		ie = nla_data(info->attrs[NL80211_ATTR_IE]);
  		ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
  	}
  
  	err = cfg80211_mlme_deauth(rdev, dev, bssid, ie, ie_len, reason_code);
  
  out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
  unlock_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  static int nl80211_disassociate(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	const u8 *ie = NULL, *bssid;
  	int err, ie_len = 0;
  	u16 reason_code;
  
  	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_MAC])
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_REASON_CODE])
  		return -EINVAL;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->disassoc) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
  
  	reason_code = nla_get_u16(info->attrs[NL80211_ATTR_REASON_CODE]);
  	if (reason_code == 0) {
  		/* Reason Code 0 is reserved */
  		err = -EINVAL;
  		goto out;
  	}
  
  	if (info->attrs[NL80211_ATTR_IE]) {
  		ie = nla_data(info->attrs[NL80211_ATTR_IE]);
  		ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
  	}
  
  	err = cfg80211_mlme_disassoc(rdev, dev, bssid, ie, ie_len, reason_code);
  
  out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
  unlock_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	struct cfg80211_ibss_params ibss;
  	struct wiphy *wiphy;
  	struct cfg80211_cached_keys *connkeys = NULL;
  	int err;
  
  	memset(&ibss, 0, sizeof(ibss));
  
  	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_WIPHY_FREQ] ||
  	    !info->attrs[NL80211_ATTR_SSID] ||
  	    !nla_len(info->attrs[NL80211_ATTR_SSID]))
  		return -EINVAL;
  
  	ibss.beacon_interval = 100;
  
  	if (info->attrs[NL80211_ATTR_BEACON_INTERVAL]) {
  		ibss.beacon_interval =
  			nla_get_u32(info->attrs[NL80211_ATTR_BEACON_INTERVAL]);
  		if (ibss.beacon_interval < 1 || ibss.beacon_interval > 10000)
  			return -EINVAL;
  	}
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->join_ibss) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	wiphy = &rdev->wiphy;
  
  	if (info->attrs[NL80211_ATTR_MAC])
  		ibss.bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
  	ibss.ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
  	ibss.ssid_len = nla_len(info->attrs[NL80211_ATTR_SSID]);
  
  	if (info->attrs[NL80211_ATTR_IE]) {
  		ibss.ie = nla_data(info->attrs[NL80211_ATTR_IE]);
  		ibss.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
  	}
  
  	ibss.channel = ieee80211_get_channel(wiphy,
  		nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]));
  	if (!ibss.channel ||
  	    ibss.channel->flags & IEEE80211_CHAN_NO_IBSS ||
  	    ibss.channel->flags & IEEE80211_CHAN_DISABLED) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	ibss.channel_fixed = !!info->attrs[NL80211_ATTR_FREQ_FIXED];
  	ibss.privacy = !!info->attrs[NL80211_ATTR_PRIVACY];
  
  	if (ibss.privacy && info->attrs[NL80211_ATTR_KEYS]) {
  		connkeys = nl80211_parse_connkeys(rdev,
  					info->attrs[NL80211_ATTR_KEYS]);
  		if (IS_ERR(connkeys)) {
  			err = PTR_ERR(connkeys);
  			connkeys = NULL;
  			goto out;
  		}
  	}
  
  	err = cfg80211_join_ibss(rdev, dev, &ibss, connkeys);
  
  out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
  unlock_rtnl:
  	if (err)
  		kfree(connkeys);
  	rtnl_unlock();
  	return err;
  }
  
  static int nl80211_leave_ibss(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	int err;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (!rdev->ops->leave_ibss) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	err = cfg80211_leave_ibss(rdev, dev, false);
  
  out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
  unlock_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  #ifdef CONFIG_NL80211_TESTMODE
  static struct genl_multicast_group nl80211_testmode_mcgrp = {
  	.name = "testmode",
  };
  
  static int nl80211_testmode_do(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	int err;
  
  	if (!info->attrs[NL80211_ATTR_TESTDATA])
  		return -EINVAL;
  
  	rtnl_lock();
  
  	rdev = cfg80211_get_dev_from_info(info);
  	if (IS_ERR(rdev)) {
  		err = PTR_ERR(rdev);
  		goto unlock_rtnl;
  	}
  
  	err = -EOPNOTSUPP;
  	if (rdev->ops->testmode_cmd) {
  		rdev->testmode_info = info;
  		err = rdev->ops->testmode_cmd(&rdev->wiphy,
  				nla_data(info->attrs[NL80211_ATTR_TESTDATA]),
  				nla_len(info->attrs[NL80211_ATTR_TESTDATA]));
  		rdev->testmode_info = NULL;
  	}
  
  	cfg80211_unlock_rdev(rdev);
  
   unlock_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  static struct sk_buff *
  __cfg80211_testmode_alloc_skb(struct cfg80211_registered_device *rdev,
  			      int approxlen, u32 pid, u32 seq, gfp_t gfp)
  {
  	struct sk_buff *skb;
  	void *hdr;
  	struct nlattr *data;
  
  	skb = nlmsg_new(approxlen + 100, gfp);
  	if (!skb)
  		return NULL;
  
  	hdr = nl80211hdr_put(skb, pid, seq, 0, NL80211_CMD_TESTMODE);
  	if (!hdr) {
  		kfree_skb(skb);
  		return NULL;
  	}
  
  	NLA_PUT_U32(skb, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
  	data = nla_nest_start(skb, NL80211_ATTR_TESTDATA);
  
  	((void **)skb->cb)[0] = rdev;
  	((void **)skb->cb)[1] = hdr;
  	((void **)skb->cb)[2] = data;
  
  	return skb;
  
   nla_put_failure:
  	kfree_skb(skb);
  	return NULL;
  }
  
  struct sk_buff *cfg80211_testmode_alloc_reply_skb(struct wiphy *wiphy,
  						  int approxlen)
  {
  	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  
  	if (WARN_ON(!rdev->testmode_info))
  		return NULL;
  
  	return __cfg80211_testmode_alloc_skb(rdev, approxlen,
  				rdev->testmode_info->snd_pid,
  				rdev->testmode_info->snd_seq,
  				GFP_KERNEL);
  }
  EXPORT_SYMBOL(cfg80211_testmode_alloc_reply_skb);
  
  int cfg80211_testmode_reply(struct sk_buff *skb)
  {
  	struct cfg80211_registered_device *rdev = ((void **)skb->cb)[0];
  	void *hdr = ((void **)skb->cb)[1];
  	struct nlattr *data = ((void **)skb->cb)[2];
  
  	if (WARN_ON(!rdev->testmode_info)) {
  		kfree_skb(skb);
  		return -EINVAL;
  	}
  
  	nla_nest_end(skb, data);
  	genlmsg_end(skb, hdr);
  	return genlmsg_reply(skb, rdev->testmode_info);
  }
  EXPORT_SYMBOL(cfg80211_testmode_reply);
  
  struct sk_buff *cfg80211_testmode_alloc_event_skb(struct wiphy *wiphy,
  						  int approxlen, gfp_t gfp)
  {
  	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  
  	return __cfg80211_testmode_alloc_skb(rdev, approxlen, 0, 0, gfp);
  }
  EXPORT_SYMBOL(cfg80211_testmode_alloc_event_skb);
  
  void cfg80211_testmode_event(struct sk_buff *skb, gfp_t gfp)
  {
  	void *hdr = ((void **)skb->cb)[1];
  	struct nlattr *data = ((void **)skb->cb)[2];
  
  	nla_nest_end(skb, data);
  	genlmsg_end(skb, hdr);
  	genlmsg_multicast(skb, 0, nl80211_testmode_mcgrp.id, gfp);
  }
  EXPORT_SYMBOL(cfg80211_testmode_event);
  #endif
  
  static int nl80211_connect(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	struct cfg80211_connect_params connect;
  	struct wiphy *wiphy;
  	struct cfg80211_cached_keys *connkeys = NULL;
  	int err;
  
  	memset(&connect, 0, sizeof(connect));
  
  	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
  		return -EINVAL;
  
  	if (!info->attrs[NL80211_ATTR_SSID] ||
  	    !nla_len(info->attrs[NL80211_ATTR_SSID]))
  		return -EINVAL;
  
  	if (info->attrs[NL80211_ATTR_AUTH_TYPE]) {
  		connect.auth_type =
  			nla_get_u32(info->attrs[NL80211_ATTR_AUTH_TYPE]);
  		if (!nl80211_valid_auth_type(connect.auth_type))
  			return -EINVAL;
  	} else
  		connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
  
  	connect.privacy = info->attrs[NL80211_ATTR_PRIVACY];
  
  	err = nl80211_crypto_settings(info, &connect.crypto,
  				      NL80211_MAX_NR_CIPHER_SUITES);
  	if (err)
  		return err;
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	wiphy = &rdev->wiphy;
  
  	if (info->attrs[NL80211_ATTR_MAC])
  		connect.bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
  	connect.ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
  	connect.ssid_len = nla_len(info->attrs[NL80211_ATTR_SSID]);
  
  	if (info->attrs[NL80211_ATTR_IE]) {
  		connect.ie = nla_data(info->attrs[NL80211_ATTR_IE]);
  		connect.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
  	}
  
  	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
  		connect.channel =
  			ieee80211_get_channel(wiphy,
  			    nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]));
  		if (!connect.channel ||
  		    connect.channel->flags & IEEE80211_CHAN_DISABLED) {
  			err = -EINVAL;
  			goto out;
  		}
  	}
  
  	if (connect.privacy && info->attrs[NL80211_ATTR_KEYS]) {
  		connkeys = nl80211_parse_connkeys(rdev,
  					info->attrs[NL80211_ATTR_KEYS]);
  		if (IS_ERR(connkeys)) {
  			err = PTR_ERR(connkeys);
  			connkeys = NULL;
  			goto out;
  		}
  	}
  
  	err = cfg80211_connect(rdev, dev, &connect, connkeys);
  
  out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
  unlock_rtnl:
  	if (err)
  		kfree(connkeys);
  	rtnl_unlock();
  	return err;
  }
  
  static int nl80211_disconnect(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net_device *dev;
  	int err;
  	u16 reason;
  
  	if (!info->attrs[NL80211_ATTR_REASON_CODE])
  		reason = WLAN_REASON_DEAUTH_LEAVING;
  	else
  		reason = nla_get_u16(info->attrs[NL80211_ATTR_REASON_CODE]);
  
  	if (reason == 0)
  		return -EINVAL;
  
  	rtnl_lock();
  
  	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
  	if (err)
  		goto unlock_rtnl;
  
  	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION) {
  		err = -EOPNOTSUPP;
  		goto out;
  	}
  
  	if (!netif_running(dev)) {
  		err = -ENETDOWN;
  		goto out;
  	}
  
  	err = cfg80211_disconnect(rdev, dev, reason, true);
  
  out:
  	cfg80211_unlock_rdev(rdev);
  	dev_put(dev);
  unlock_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  static int nl80211_wiphy_netns(struct sk_buff *skb, struct genl_info *info)
  {
  	struct cfg80211_registered_device *rdev;
  	struct net *net;
  	int err;
  	u32 pid;
  
  	if (!info->attrs[NL80211_ATTR_PID])
  		return -EINVAL;
  
  	pid = nla_get_u32(info->attrs[NL80211_ATTR_PID]);
  
  	rtnl_lock();
  
  	rdev = cfg80211_get_dev_from_info(info);
  	if (IS_ERR(rdev)) {
  		err = PTR_ERR(rdev);
  		goto out_rtnl;
  	}
  
  	net = get_net_ns_by_pid(pid);
  	if (IS_ERR(net)) {
  		err = PTR_ERR(net);
  		goto out;
  	}
  
  	err = 0;
  
  	/* check if anything to do */
  	if (net_eq(wiphy_net(&rdev->wiphy), net))
  		goto out_put_net;
  
  	err = cfg80211_switch_netns(rdev, net);
   out_put_net:
  	put_net(net);
   out:
  	cfg80211_unlock_rdev(rdev);
   out_rtnl:
  	rtnl_unlock();
  	return err;
  }
  
  static struct genl_ops nl80211_ops[] = {
  	{
  		.cmd = NL80211_CMD_GET_WIPHY,
  		.doit = nl80211_get_wiphy,
  		.dumpit = nl80211_dump_wiphy,
  		.policy = nl80211_policy,
  		/* can be retrieved by unprivileged users */
  	},
  	{
  		.cmd = NL80211_CMD_SET_WIPHY,
  		.doit = nl80211_set_wiphy,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_GET_INTERFACE,
  		.doit = nl80211_get_interface,
  		.dumpit = nl80211_dump_interface,
  		.policy = nl80211_policy,
  		/* can be retrieved by unprivileged users */
  	},
  	{
  		.cmd = NL80211_CMD_SET_INTERFACE,
  		.doit = nl80211_set_interface,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_NEW_INTERFACE,
  		.doit = nl80211_new_interface,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_DEL_INTERFACE,
  		.doit = nl80211_del_interface,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_GET_KEY,
  		.doit = nl80211_get_key,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_SET_KEY,
  		.doit = nl80211_set_key,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_NEW_KEY,
  		.doit = nl80211_new_key,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_DEL_KEY,
  		.doit = nl80211_del_key,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_SET_BEACON,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  		.doit = nl80211_addset_beacon,
  	},
  	{
  		.cmd = NL80211_CMD_NEW_BEACON,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  		.doit = nl80211_addset_beacon,
  	},
  	{
  		.cmd = NL80211_CMD_DEL_BEACON,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  		.doit = nl80211_del_beacon,
  	},
  	{
  		.cmd = NL80211_CMD_GET_STATION,
  		.doit = nl80211_get_station,
  		.dumpit = nl80211_dump_station,
  		.policy = nl80211_policy,
  	},
  	{
  		.cmd = NL80211_CMD_SET_STATION,
  		.doit = nl80211_set_station,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_NEW_STATION,
  		.doit = nl80211_new_station,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_DEL_STATION,
  		.doit = nl80211_del_station,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_GET_MPATH,
  		.doit = nl80211_get_mpath,
  		.dumpit = nl80211_dump_mpath,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_SET_MPATH,
  		.doit = nl80211_set_mpath,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_NEW_MPATH,
  		.doit = nl80211_new_mpath,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_DEL_MPATH,
  		.doit = nl80211_del_mpath,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_SET_BSS,
  		.doit = nl80211_set_bss,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_GET_REG,
  		.doit = nl80211_get_reg,
  		.policy = nl80211_policy,
  		/* can be retrieved by unprivileged users */
  	},
  	{
  		.cmd = NL80211_CMD_SET_REG,
  		.doit = nl80211_set_reg,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_REQ_SET_REG,
  		.doit = nl80211_req_set_reg,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_GET_MESH_PARAMS,
  		.doit = nl80211_get_mesh_params,
  		.policy = nl80211_policy,
  		/* can be retrieved by unprivileged users */
  	},
  	{
  		.cmd = NL80211_CMD_SET_MESH_PARAMS,
  		.doit = nl80211_set_mesh_params,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_TRIGGER_SCAN,
  		.doit = nl80211_trigger_scan,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_GET_SCAN,
  		.policy = nl80211_policy,
  		.dumpit = nl80211_dump_scan,
  	},
  	{
  		.cmd = NL80211_CMD_AUTHENTICATE,
  		.doit = nl80211_authenticate,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_ASSOCIATE,
  		.doit = nl80211_associate,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_DEAUTHENTICATE,
  		.doit = nl80211_deauthenticate,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_DISASSOCIATE,
  		.doit = nl80211_disassociate,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_JOIN_IBSS,
  		.doit = nl80211_join_ibss,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_LEAVE_IBSS,
  		.doit = nl80211_leave_ibss,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  #ifdef CONFIG_NL80211_TESTMODE
  	{
  		.cmd = NL80211_CMD_TESTMODE,
  		.doit = nl80211_testmode_do,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  #endif
  	{
  		.cmd = NL80211_CMD_CONNECT,
  		.doit = nl80211_connect,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_DISCONNECT,
  		.doit = nl80211_disconnect,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  	{
  		.cmd = NL80211_CMD_SET_WIPHY_NETNS,
  		.doit = nl80211_wiphy_netns,
  		.policy = nl80211_policy,
  		.flags = GENL_ADMIN_PERM,
  	},
  };
  static struct genl_multicast_group nl80211_mlme_mcgrp = {
  	.name = "mlme",
  };
  
  /* multicast groups */
  static struct genl_multicast_group nl80211_config_mcgrp = {
  	.name = "config",
  };
  static struct genl_multicast_group nl80211_scan_mcgrp = {
  	.name = "scan",
  };
  static struct genl_multicast_group nl80211_regulatory_mcgrp = {
  	.name = "regulatory",
  };
  
  /* notification functions */
  
  void nl80211_notify_dev_rename(struct cfg80211_registered_device *rdev)
  {
  	struct sk_buff *msg;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return;
  
  	if (nl80211_send_wiphy(msg, 0, 0, 0, rdev) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_config_mcgrp.id, GFP_KERNEL);
  }
  
  static int nl80211_add_scan_req(struct sk_buff *msg,
  				struct cfg80211_registered_device *rdev)
  {
  	struct cfg80211_scan_request *req = rdev->scan_req;
  	struct nlattr *nest;
  	int i;
  
  	ASSERT_RDEV_LOCK(rdev);
  
  	if (WARN_ON(!req))
  		return 0;
  
  	nest = nla_nest_start(msg, NL80211_ATTR_SCAN_SSIDS);
  	if (!nest)
  		goto nla_put_failure;
  	for (i = 0; i < req->n_ssids; i++)
  		NLA_PUT(msg, i, req->ssids[i].ssid_len, req->ssids[i].ssid);
  	nla_nest_end(msg, nest);
  
  	nest = nla_nest_start(msg, NL80211_ATTR_SCAN_FREQUENCIES);
  	if (!nest)
  		goto nla_put_failure;
  	for (i = 0; i < req->n_channels; i++)
  		NLA_PUT_U32(msg, i, req->channels[i]->center_freq);
  	nla_nest_end(msg, nest);
  
  	if (req->ie)
  		NLA_PUT(msg, NL80211_ATTR_IE, req->ie_len, req->ie);
  
  	return 0;
   nla_put_failure:
  	return -ENOBUFS;
  }
  
  static int nl80211_send_scan_msg(struct sk_buff *msg,
  				 struct cfg80211_registered_device *rdev,
  				 struct net_device *netdev,
  				 u32 pid, u32 seq, int flags,
  				 u32 cmd)
  {
  	void *hdr;
  
  	hdr = nl80211hdr_put(msg, pid, seq, flags, cmd);
  	if (!hdr)
  		return -1;
  
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
  
  	/* ignore errors and send incomplete event anyway */
  	nl80211_add_scan_req(msg, rdev);
  
  	return genlmsg_end(msg, hdr);
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	return -EMSGSIZE;
  }
  
  void nl80211_send_scan_start(struct cfg80211_registered_device *rdev,
  			     struct net_device *netdev)
  {
  	struct sk_buff *msg;
  
  	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
  	if (!msg)
  		return;
  
  	if (nl80211_send_scan_msg(msg, rdev, netdev, 0, 0, 0,
  				  NL80211_CMD_TRIGGER_SCAN) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_scan_mcgrp.id, GFP_KERNEL);
  }
  
  void nl80211_send_scan_done(struct cfg80211_registered_device *rdev,
  			    struct net_device *netdev)
  {
  	struct sk_buff *msg;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return;
  
  	if (nl80211_send_scan_msg(msg, rdev, netdev, 0, 0, 0,
  				  NL80211_CMD_NEW_SCAN_RESULTS) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_scan_mcgrp.id, GFP_KERNEL);
  }
  
  void nl80211_send_scan_aborted(struct cfg80211_registered_device *rdev,
  			       struct net_device *netdev)
  {
  	struct sk_buff *msg;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return;
  
  	if (nl80211_send_scan_msg(msg, rdev, netdev, 0, 0, 0,
  				  NL80211_CMD_SCAN_ABORTED) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_scan_mcgrp.id, GFP_KERNEL);
  }
  
  /*
   * This can happen on global regulatory changes or device specific settings
   * based on custom world regulatory domains.
   */
  void nl80211_send_reg_change_event(struct regulatory_request *request)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return;
  
  	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_REG_CHANGE);
  	if (!hdr) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	/* Userspace can always count this one always being set */
  	NLA_PUT_U8(msg, NL80211_ATTR_REG_INITIATOR, request->initiator);
  
  	if (request->alpha2[0] == '0' && request->alpha2[1] == '0')
  		NLA_PUT_U8(msg, NL80211_ATTR_REG_TYPE,
  			   NL80211_REGDOM_TYPE_WORLD);
  	else if (request->alpha2[0] == '9' && request->alpha2[1] == '9')
  		NLA_PUT_U8(msg, NL80211_ATTR_REG_TYPE,
  			   NL80211_REGDOM_TYPE_CUSTOM_WORLD);
  	else if ((request->alpha2[0] == '9' && request->alpha2[1] == '8') ||
  		 request->intersect)
  		NLA_PUT_U8(msg, NL80211_ATTR_REG_TYPE,
  			   NL80211_REGDOM_TYPE_INTERSECTION);
  	else {
  		NLA_PUT_U8(msg, NL80211_ATTR_REG_TYPE,
  			   NL80211_REGDOM_TYPE_COUNTRY);
  		NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2, request->alpha2);
  	}
  
  	if (wiphy_idx_valid(request->wiphy_idx))
  		NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, request->wiphy_idx);
  
  	if (genlmsg_end(msg, hdr) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	rcu_read_lock();
  	genlmsg_multicast_allns(msg, 0, nl80211_regulatory_mcgrp.id,
  				GFP_ATOMIC);
  	rcu_read_unlock();
  
  	return;
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	nlmsg_free(msg);
  }
  
  static void nl80211_send_mlme_event(struct cfg80211_registered_device *rdev,
  				    struct net_device *netdev,
  				    const u8 *buf, size_t len,
  				    enum nl80211_commands cmd, gfp_t gfp)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
  	if (!msg)
  		return;
  
  	hdr = nl80211hdr_put(msg, 0, 0, 0, cmd);
  	if (!hdr) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
  	NLA_PUT(msg, NL80211_ATTR_FRAME, len, buf);
  
  	if (genlmsg_end(msg, hdr) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_mlme_mcgrp.id, gfp);
  	return;
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	nlmsg_free(msg);
  }
  
  void nl80211_send_rx_auth(struct cfg80211_registered_device *rdev,
  			  struct net_device *netdev, const u8 *buf,
  			  size_t len, gfp_t gfp)
  {
  	nl80211_send_mlme_event(rdev, netdev, buf, len,
  				NL80211_CMD_AUTHENTICATE, gfp);
  }
  
  void nl80211_send_rx_assoc(struct cfg80211_registered_device *rdev,
  			   struct net_device *netdev, const u8 *buf,
  			   size_t len, gfp_t gfp)
  {
  	nl80211_send_mlme_event(rdev, netdev, buf, len,
  				NL80211_CMD_ASSOCIATE, gfp);
  }
  
  void nl80211_send_deauth(struct cfg80211_registered_device *rdev,
  			 struct net_device *netdev, const u8 *buf,
  			 size_t len, gfp_t gfp)
  {
  	nl80211_send_mlme_event(rdev, netdev, buf, len,
  				NL80211_CMD_DEAUTHENTICATE, gfp);
  }
  
  void nl80211_send_disassoc(struct cfg80211_registered_device *rdev,
  			   struct net_device *netdev, const u8 *buf,
  			   size_t len, gfp_t gfp)
  {
  	nl80211_send_mlme_event(rdev, netdev, buf, len,
  				NL80211_CMD_DISASSOCIATE, gfp);
  }
  
  static void nl80211_send_mlme_timeout(struct cfg80211_registered_device *rdev,
  				      struct net_device *netdev, int cmd,
  				      const u8 *addr, gfp_t gfp)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
  	if (!msg)
  		return;
  
  	hdr = nl80211hdr_put(msg, 0, 0, 0, cmd);
  	if (!hdr) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
  	NLA_PUT_FLAG(msg, NL80211_ATTR_TIMED_OUT);
  	NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
  
  	if (genlmsg_end(msg, hdr) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_mlme_mcgrp.id, gfp);
  	return;
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	nlmsg_free(msg);
  }
  
  void nl80211_send_auth_timeout(struct cfg80211_registered_device *rdev,
  			       struct net_device *netdev, const u8 *addr,
  			       gfp_t gfp)
  {
  	nl80211_send_mlme_timeout(rdev, netdev, NL80211_CMD_AUTHENTICATE,
  				  addr, gfp);
  }
  
  void nl80211_send_assoc_timeout(struct cfg80211_registered_device *rdev,
  				struct net_device *netdev, const u8 *addr,
  				gfp_t gfp)
  {
  	nl80211_send_mlme_timeout(rdev, netdev, NL80211_CMD_ASSOCIATE,
  				  addr, gfp);
  }
  
  void nl80211_send_connect_result(struct cfg80211_registered_device *rdev,
  				 struct net_device *netdev, const u8 *bssid,
  				 const u8 *req_ie, size_t req_ie_len,
  				 const u8 *resp_ie, size_t resp_ie_len,
  				 u16 status, gfp_t gfp)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
  	if (!msg)
  		return;
  
  	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_CONNECT);
  	if (!hdr) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
  	if (bssid)
  		NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, bssid);
  	NLA_PUT_U16(msg, NL80211_ATTR_STATUS_CODE, status);
  	if (req_ie)
  		NLA_PUT(msg, NL80211_ATTR_REQ_IE, req_ie_len, req_ie);
  	if (resp_ie)
  		NLA_PUT(msg, NL80211_ATTR_RESP_IE, resp_ie_len, resp_ie);
  
  	if (genlmsg_end(msg, hdr) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_mlme_mcgrp.id, gfp);
  	return;
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	nlmsg_free(msg);
  
  }
  
  void nl80211_send_roamed(struct cfg80211_registered_device *rdev,
  			 struct net_device *netdev, const u8 *bssid,
  			 const u8 *req_ie, size_t req_ie_len,
  			 const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
  	if (!msg)
  		return;
  
  	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_ROAM);
  	if (!hdr) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
  	NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, bssid);
  	if (req_ie)
  		NLA_PUT(msg, NL80211_ATTR_REQ_IE, req_ie_len, req_ie);
  	if (resp_ie)
  		NLA_PUT(msg, NL80211_ATTR_RESP_IE, resp_ie_len, resp_ie);
  
  	if (genlmsg_end(msg, hdr) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_mlme_mcgrp.id, gfp);
  	return;
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	nlmsg_free(msg);
  
  }
  
  void nl80211_send_disconnected(struct cfg80211_registered_device *rdev,
  			       struct net_device *netdev, u16 reason,
  			       const u8 *ie, size_t ie_len, bool from_ap)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
  	if (!msg)
  		return;
  
  	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_DISCONNECT);
  	if (!hdr) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
  	if (from_ap && reason)
  		NLA_PUT_U16(msg, NL80211_ATTR_REASON_CODE, reason);
  	if (from_ap)
  		NLA_PUT_FLAG(msg, NL80211_ATTR_DISCONNECTED_BY_AP);
  	if (ie)
  		NLA_PUT(msg, NL80211_ATTR_IE, ie_len, ie);
  
  	if (genlmsg_end(msg, hdr) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_mlme_mcgrp.id, GFP_KERNEL);
  	return;
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	nlmsg_free(msg);
  
  }
  
  void nl80211_send_ibss_bssid(struct cfg80211_registered_device *rdev,
  			     struct net_device *netdev, const u8 *bssid,
  			     gfp_t gfp)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
  	if (!msg)
  		return;
  
  	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_JOIN_IBSS);
  	if (!hdr) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
  	NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, bssid);
  
  	if (genlmsg_end(msg, hdr) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_mlme_mcgrp.id, gfp);
  	return;
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	nlmsg_free(msg);
  }
  
  void nl80211_michael_mic_failure(struct cfg80211_registered_device *rdev,
  				 struct net_device *netdev, const u8 *addr,
  				 enum nl80211_key_type key_type, int key_id,
  				 const u8 *tsc, gfp_t gfp)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
  	if (!msg)
  		return;
  
  	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_MICHAEL_MIC_FAILURE);
  	if (!hdr) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
  	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
  	if (addr)
  		NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
  	NLA_PUT_U32(msg, NL80211_ATTR_KEY_TYPE, key_type);
  	NLA_PUT_U8(msg, NL80211_ATTR_KEY_IDX, key_id);
  	if (tsc)
  		NLA_PUT(msg, NL80211_ATTR_KEY_SEQ, 6, tsc);
  
  	if (genlmsg_end(msg, hdr) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
  				nl80211_mlme_mcgrp.id, gfp);
  	return;
  
   nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	nlmsg_free(msg);
  }
  
  void nl80211_send_beacon_hint_event(struct wiphy *wiphy,
  				    struct ieee80211_channel *channel_before,
  				    struct ieee80211_channel *channel_after)
  {
  	struct sk_buff *msg;
  	void *hdr;
  	struct nlattr *nl_freq;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
  	if (!msg)
  		return;
  
  	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_REG_BEACON_HINT);
  	if (!hdr) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	/*
  	 * Since we are applying the beacon hint to a wiphy we know its
  	 * wiphy_idx is valid
  	 */
  	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, get_wiphy_idx(wiphy));
  
  	/* Before */
  	nl_freq = nla_nest_start(msg, NL80211_ATTR_FREQ_BEFORE);
  	if (!nl_freq)
  		goto nla_put_failure;
  	if (nl80211_msg_put_channel(msg, channel_before))
  		goto nla_put_failure;
  	nla_nest_end(msg, nl_freq);
  
  	/* After */
  	nl_freq = nla_nest_start(msg, NL80211_ATTR_FREQ_AFTER);
  	if (!nl_freq)
  		goto nla_put_failure;
  	if (nl80211_msg_put_channel(msg, channel_after))
  		goto nla_put_failure;
  	nla_nest_end(msg, nl_freq);
  
  	if (genlmsg_end(msg, hdr) < 0) {
  		nlmsg_free(msg);
  		return;
  	}
  
  	rcu_read_lock();
  	genlmsg_multicast_allns(msg, 0, nl80211_regulatory_mcgrp.id,
  				GFP_ATOMIC);
  	rcu_read_unlock();
  
  	return;
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	nlmsg_free(msg);
  }
  
  /* initialisation/exit functions */
  
  int nl80211_init(void)
  {
  	int err;
  
  	err = genl_register_family_with_ops(&nl80211_fam,
  		nl80211_ops, ARRAY_SIZE(nl80211_ops));
  	if (err)
  		return err;
  
  	err = genl_register_mc_group(&nl80211_fam, &nl80211_config_mcgrp);
  	if (err)
  		goto err_out;
  
  	err = genl_register_mc_group(&nl80211_fam, &nl80211_scan_mcgrp);
  	if (err)
  		goto err_out;
  
  	err = genl_register_mc_group(&nl80211_fam, &nl80211_regulatory_mcgrp);
  	if (err)
  		goto err_out;
  
  	err = genl_register_mc_group(&nl80211_fam, &nl80211_mlme_mcgrp);
  	if (err)
  		goto err_out;
  
  #ifdef CONFIG_NL80211_TESTMODE
  	err = genl_register_mc_group(&nl80211_fam, &nl80211_testmode_mcgrp);
  	if (err)
  		goto err_out;
  #endif
  
  	return 0;
   err_out:
  	genl_unregister_family(&nl80211_fam);
  	return err;
  }
  
  void nl80211_exit(void)
  {
  	genl_unregister_family(&nl80211_fam);
  }
  