net/wireless/nl80211.c - fp2-dev/kernel/msm - Gitiles

 /*
  * 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/genetlink.h>
 #include <net/cfg80211.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,
 };

 /* internal helper: get drv and dev */
 static int get_drv_dev_by_info_ifindex(struct nlattr **attrs,
 				       struct cfg80211_registered_device **drv,
 				       struct net_device **dev)
 {
 	int ifindex;

 	if (!attrs[NL80211_ATTR_IFINDEX])
 		return -EINVAL;

 	ifindex = nla_get_u32(attrs[NL80211_ATTR_IFINDEX]);
 	*dev = dev_get_by_index(&init_net, ifindex);
 	if (!*dev)
 		return -ENODEV;

 	*drv = cfg80211_get_dev_from_ifindex(ifindex);
 	if (IS_ERR(*drv)) {
 		dev_put(*dev);
 		return PTR_ERR(*drv);
 	}

 	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_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 },
 };

 /* 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 */

 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_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);

 #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_drv_list, list) {
 		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_put_dev(dev);

 	return genlmsg_unicast(msg, info->snd_pid);

  out_free:
 	nlmsg_free(msg);
  out_err:
 	cfg80211_put_dev(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_drv_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;
 		struct ieee80211_channel *chan;
 		struct ieee80211_sta_ht_cap *ht_cap;
 		u32 freq;

 		if (!rdev->ops->set_channel) {
 			result = -EOPNOTSUPP;
 			goto bad_res;
 		}

 		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]);
 		chan = ieee80211_get_channel(&rdev->wiphy, freq);

 		/* Primary channel not allowed */
 		if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
 			goto bad_res;

 		if (channel_type == NL80211_CHAN_HT40MINUS &&
 		    (chan->flags & IEEE80211_CHAN_NO_HT40MINUS))
 			goto bad_res;
 		else if (channel_type == NL80211_CHAN_HT40PLUS &&
 			 (chan->flags & IEEE80211_CHAN_NO_HT40PLUS))
 			goto bad_res;

 		/*
 		 * At this point we know if that if HT40 was requested
 		 * we are allowed to use it and the extension channel
 		 * exists.
 		 */

 		ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap;

 		/* no HT capabilities or intolerant */
 		if (channel_type != NL80211_CHAN_NO_HT) {
 			if (!ht_cap->ht_supported)
 				goto bad_res;
 			if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
 			    (ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT))
 				goto bad_res;
 		}

 		result = rdev->ops->set_channel(&rdev->wiphy, chan,
 						channel_type);
 		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);
 	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 *dev;
 	struct wireless_dev *wdev;

 	mutex_lock(&cfg80211_mutex);
 	list_for_each_entry(dev, &cfg80211_drv_list, list) {
 		if (wp_idx < wp_start) {
 			wp_idx++;
 			continue;
 		}
 		if_idx = 0;

 		mutex_lock(&dev->devlist_mtx);
 		list_for_each_entry(wdev, &dev->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,
 					       dev, wdev->netdev) < 0) {
 				mutex_unlock(&dev->devlist_mtx);
 				goto out;
 			}
 			if_idx++;
 		}
 		mutex_unlock(&dev->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_drv_dev_by_info_ifindex(info->attrs, &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_put_dev(dev);

 	return genlmsg_unicast(msg, info->snd_pid);

  out_free:
 	nlmsg_free(msg);
  out_err:
 	dev_put(netdev);
 	cfg80211_put_dev(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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &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 (!drv->ops->change_virtual_intf ||
 	    !(drv->wiphy.interface_modes & (1 << ntype))) {
 		err = -EOPNOTSUPP;
 		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 = drv->ops->change_virtual_intf(&drv->wiphy, dev,
 						    ntype, flags, &params);
 	else
 		err = 0;

 	WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);

 	if (!err && (ntype != otype)) {
 		if (otype == NL80211_IFTYPE_ADHOC)
 			cfg80211_clear_ibss(dev, false);
 	}

  unlock:
 	dev_put(dev);
 	cfg80211_put_dev(drv);
  unlock_rtnl:
 	rtnl_unlock();
 	return err;
 }

 static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
 {
 	struct cfg80211_registered_device *drv;
 	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();

 	drv = cfg80211_get_dev_from_info(info);
 	if (IS_ERR(drv)) {
 		err = PTR_ERR(drv);
 		goto unlock_rtnl;
 	}

 	if (!drv->ops->add_virtual_intf ||
 	    !(drv->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 = drv->ops->add_virtual_intf(&drv->wiphy,
 		nla_data(info->attrs[NL80211_ATTR_IFNAME]),
 		type, err ? NULL : &flags, &params);

  unlock:
 	cfg80211_put_dev(drv);
  unlock_rtnl:
 	rtnl_unlock();
 	return err;
 }

 static int nl80211_del_interface(struct sk_buff *skb, struct genl_info *info)
 {
 	struct cfg80211_registered_device *drv;
 	int ifindex, err;
 	struct net_device *dev;

 	rtnl_lock();

 	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;
 	ifindex = dev->ifindex;
 	dev_put(dev);

 	if (!drv->ops->del_virtual_intf) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	err = drv->ops->del_virtual_intf(&drv->wiphy, ifindex);

  out:
 	cfg80211_put_dev(drv);
  unlock_rtnl:
 	rtnl_unlock();
 	return err;
 }

 struct get_key_cookie {
 	struct sk_buff *msg;
 	int error;
 };

 static void get_key_callback(void *c, struct key_params *params)
 {
 	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);

 	return;
  nla_put_failure:
 	cookie->error = 1;
 }

 static int nl80211_get_key(struct sk_buff *skb, struct genl_info *info)
 {
 	struct cfg80211_registered_device *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	if (!drv->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 out;
 	}

 	cookie.msg = msg;

 	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 = drv->ops->get_key(&drv->wiphy, dev, key_idx, mac_addr,
 				&cookie, get_key_callback);

 	if (err)
 		goto out;

 	if (cookie.error)
 		goto nla_put_failure;

 	genlmsg_end(msg, hdr);
 	err = genlmsg_unicast(msg, info->snd_pid);
 	goto out;

  nla_put_failure:
 	err = -ENOBUFS;
 	nlmsg_free(msg);
  out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	int err;
 	struct net_device *dev;
 	u8 key_idx;
 	int (*func)(struct wiphy *wiphy, struct net_device *netdev,
 		    u8 key_index);

 	if (!info->attrs[NL80211_ATTR_KEY_IDX])
 		return -EINVAL;

 	key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);

 	if (info->attrs[NL80211_ATTR_KEY_DEFAULT_MGMT]) {
 		if (key_idx < 4 || key_idx > 5)
 			return -EINVAL;
 	} else if (key_idx > 3)
 		return -EINVAL;

 	/* currently only support setting default key */
 	if (!info->attrs[NL80211_ATTR_KEY_DEFAULT] &&
 	    !info->attrs[NL80211_ATTR_KEY_DEFAULT_MGMT])
 		return -EINVAL;

 	rtnl_lock();

 	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	if (info->attrs[NL80211_ATTR_KEY_DEFAULT])
 		func = drv->ops->set_default_key;
 	else
 		func = drv->ops->set_default_mgmt_key;

 	if (!func) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	err = func(&drv->wiphy, dev, key_idx);
 #ifdef CONFIG_WIRELESS_EXT
 	if (!err) {
 		if (func == drv->ops->set_default_key)
 			dev->ieee80211_ptr->wext.default_key = key_idx;
 		else
 			dev->ieee80211_ptr->wext.default_mgmt_key = key_idx;
 	}
 #endif

  out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	int err, i;
 	struct net_device *dev;
 	struct key_params params;
 	u8 key_idx = 0;
 	u8 *mac_addr = NULL;

 	memset(&params, 0, sizeof(params));

 	if (!info->attrs[NL80211_ATTR_KEY_CIPHER])
 		return -EINVAL;

 	if (info->attrs[NL80211_ATTR_KEY_DATA]) {
 		params.key = nla_data(info->attrs[NL80211_ATTR_KEY_DATA]);
 		params.key_len = nla_len(info->attrs[NL80211_ATTR_KEY_DATA]);
 	}

 	if (info->attrs[NL80211_ATTR_KEY_SEQ]) {
 		params.seq = nla_data(info->attrs[NL80211_ATTR_KEY_SEQ]);
 		params.seq_len = nla_len(info->attrs[NL80211_ATTR_KEY_SEQ]);
 	}

 	if (info->attrs[NL80211_ATTR_KEY_IDX])
 		key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);

 	params.cipher = nla_get_u32(info->attrs[NL80211_ATTR_KEY_CIPHER]);

 	if (info->attrs[NL80211_ATTR_MAC])
 		mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);

 	if (cfg80211_validate_key_settings(&params, key_idx, mac_addr))
 		return -EINVAL;

 	rtnl_lock();

 	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	for (i = 0; i < drv->wiphy.n_cipher_suites; i++)
 		if (params.cipher == drv->wiphy.cipher_suites[i])
 			break;
 	if (i == drv->wiphy.n_cipher_suites) {
 		err = -EINVAL;
 		goto out;
 	}

 	if (!drv->ops->add_key) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	err = drv->ops->add_key(&drv->wiphy, dev, key_idx, mac_addr, &params);

  out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	int err;
 	struct net_device *dev;
 	u8 key_idx = 0;
 	u8 *mac_addr = NULL;

 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	if (!drv->ops->del_key) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	err = drv->ops->del_key(&drv->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

  out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &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 = drv->ops->add_beacon;
 		break;
 	case NL80211_CMD_SET_BEACON:
 		call = drv->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(&drv->wiphy, dev, &params);

  out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	int err;
 	struct net_device *dev;

 	rtnl_lock();

 	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	if (!drv->ops->del_beacon) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}
 	err = drv->ops->del_beacon(&drv->wiphy, dev);

  out:
 	cfg80211_put_dev(drv);
 	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 u16 nl80211_calculate_bitrate(struct rate_info *rate)
 {
 	int modulation, streams, bitrate;

 	if (!(rate->flags & RATE_INFO_FLAGS_MCS))
 		return rate->legacy;

 	/* the formula below does only work for MCS values smaller than 32 */
 	if (rate->mcs >= 32)
 		return 0;

 	modulation = rate->mcs & 7;
 	streams = (rate->mcs >> 3) + 1;

 	bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
 			13500000 : 6500000;

 	if (modulation < 4)
 		bitrate *= (modulation + 1);
 	else if (modulation == 4)
 		bitrate *= (modulation + 2);
 	else
 		bitrate *= (modulation + 3);

 	bitrate *= streams;

 	if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 		bitrate = (bitrate / 9) * 10;

 	/* do NOT round down here */
 	return (bitrate + 50000) / 100000;
 }

 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);

 	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;

 		/* nl80211_calculate_bitrate will return 0 for mcs >= 32 */
 		bitrate = nl80211_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(&init_net, ifidx);
 	if (!netdev) {
 		err = -ENODEV;
 		goto out_rtnl;
 	}

 	dev = cfg80211_get_dev_from_ifindex(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_put_dev(dev);
  out_rtnl:
 	rtnl_unlock();

 	return err;
 }

 static int nl80211_get_station(struct sk_buff *skb, struct genl_info *info)
 {
 	struct cfg80211_registered_device *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	if (!drv->ops->get_station) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	err = drv->ops->get_station(&drv->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_unicast(msg, info->snd_pid);
 	goto out;

  out_free:
 	nlmsg_free(msg);
  out:
 	cfg80211_put_dev(drv);
 	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 nlattr *vlanattr,
 		    struct cfg80211_registered_device *rdev,
 		    struct net_device **vlan)
 {
 	*vlan = NULL;

 	if (vlanattr) {
 		*vlan = dev_get_by_index(&init_net, 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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	err = get_vlan(info->attrs[NL80211_ATTR_STA_VLAN], drv, &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 (!drv->ops->change_station) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	err = drv->ops->change_station(&drv->wiphy, dev, mac_addr, &params);

  out:
 	if (params.vlan)
 		dev_put(params.vlan);
 	cfg80211_put_dev(drv);
 	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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	err = get_vlan(info->attrs[NL80211_ATTR_STA_VLAN], drv, &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 (!drv->ops->add_station) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	if (!netif_running(dev)) {
 		err = -ENETDOWN;
 		goto out;
 	}

 	err = drv->ops->add_station(&drv->wiphy, dev, mac_addr, &params);

  out:
 	if (params.vlan)
 		dev_put(params.vlan);
 	cfg80211_put_dev(drv);
 	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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &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 (!drv->ops->del_station) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	err = drv->ops->del_station(&drv->wiphy, dev, mac_addr);

  out:
 	cfg80211_put_dev(drv);
 	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);

 	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(&init_net, ifidx);
 	if (!netdev) {
 		err = -ENODEV;
 		goto out_rtnl;
 	}

 	dev = cfg80211_get_dev_from_ifindex(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;
 	}

 	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_put_dev(dev);
  out_rtnl:
 	rtnl_unlock();

 	return err;
 }

 static int nl80211_get_mpath(struct sk_buff *skb, struct genl_info *info)
 {
 	struct cfg80211_registered_device *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	if (!drv->ops->get_mpath) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	err = drv->ops->get_mpath(&drv->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_unicast(msg, info->snd_pid);
 	goto out;

  out_free:
 	nlmsg_free(msg);
  out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	if (!drv->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 = drv->ops->change_mpath(&drv->wiphy, dev, dst, next_hop);

  out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	if (!drv->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 = drv->ops->add_mpath(&drv->wiphy, dev, dst, next_hop);

  out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	if (!drv->ops->del_mpath) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	err = drv->ops->del_mpath(&drv->wiphy, dev, dst);

  out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	if (!drv->ops->change_bss) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	err = drv->ops->change_bss(&drv->wiphy, dev, &params);

  out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	if (!drv->ops->get_mesh_params) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	/* Get the mesh params */
 	err = drv->ops->get_mesh_params(&drv->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_unicast(msg, info->snd_pid);
 	goto out;

  nla_put_failure:
 	genlmsg_cancel(msg, hdr);
 	err = -EMSGSIZE;
  out:
 	/* Cleanup */
 	cfg80211_put_dev(drv);
 	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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	if (!drv->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 = drv->ops->set_mesh_params(&drv->wiphy, dev, &cfg, mask);

  out:
 	/* cleanup */
 	cfg80211_put_dev(drv);
 	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_unicast(msg, info->snd_pid);
 	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 *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto out_rtnl;

 	wiphy = &drv->wiphy;

 	if (!drv->ops->scan) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}

 	if (!netif_running(dev)) {
 		err = -ENETDOWN;
 		goto out;
 	}

 	if (drv->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->channels = (void *)((char *)request + sizeof(*request));
 	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->ifidx = dev->ifindex;
 	request->wiphy = &drv->wiphy;

 	drv->scan_req = request;
 	err = drv->ops->scan(&drv->wiphy, dev, request);

 	if (!err)
 		nl80211_send_scan_start(drv, dev);

  out_free:
 	if (err) {
 		drv->scan_req = NULL;
 		kfree(request);
 	}
  out:
 	cfg80211_put_dev(drv);
 	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 net_device *dev,
 			    struct cfg80211_bss *res)
 {
 	void *hdr;
 	struct nlattr *bss;

 	hdr = nl80211hdr_put(msg, pid, seq, flags,
 			     NL80211_CMD_NEW_SCAN_RESULTS);
 	if (!hdr)
 		return -1;

 	NLA_PUT_U32(msg, NL80211_ATTR_SCAN_GENERATION,
 		    rdev->bss_generation);
 	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->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;
 	}

 	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 *dev;
 	struct net_device *netdev;
 	struct cfg80211_internal_bss *scan;
 	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;
 	}

 	netdev = dev_get_by_index(&init_net, ifidx);
 	if (!netdev)
 		return -ENODEV;

 	dev = cfg80211_get_dev_from_ifindex(ifidx);
 	if (IS_ERR(dev)) {
 		err = PTR_ERR(dev);
 		goto out_put_netdev;
 	}

 	spin_lock_bh(&dev->bss_lock);
 	cfg80211_bss_expire(dev);

 	list_for_each_entry(scan, &dev->bss_list, list) {
 		if (++idx <= start)
 			continue;
 		if (nl80211_send_bss(skb,
 				NETLINK_CB(cb->skb).pid,
 				cb->nlh->nlmsg_seq, NLM_F_MULTI,
 				dev, netdev, &scan->pub) < 0) {
 			idx--;
 			goto out;
 		}
 	}

  out:
 	spin_unlock_bh(&dev->bss_lock);

 	cb->args[1] = idx;
 	err = skb->len;
 	cfg80211_put_dev(dev);
  out_put_netdev:
 	dev_put(netdev);

 	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 *drv;
 	struct net_device *dev;
 	struct cfg80211_auth_request req;
 	struct wiphy *wiphy;
 	int err;

 	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;

 	rtnl_lock();

 	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	if (!drv->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;
 	}

 	wiphy = &drv->wiphy;
 	memset(&req, 0, sizeof(req));

 	req.peer_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);

 	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
 		req.chan = ieee80211_get_channel(
 			wiphy,
 			nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]));
 		if (!req.chan) {
 			err = -EINVAL;
 			goto out;
 		}
 	}

 	if (info->attrs[NL80211_ATTR_SSID]) {
 		req.ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
 		req.ssid_len = nla_len(info->attrs[NL80211_ATTR_SSID]);
 	}

 	if (info->attrs[NL80211_ATTR_IE]) {
 		req.ie = nla_data(info->attrs[NL80211_ATTR_IE]);
 		req.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
 	}

 	req.auth_type = nla_get_u32(info->attrs[NL80211_ATTR_AUTH_TYPE]);
 	if (!nl80211_valid_auth_type(req.auth_type)) {
 		err = -EINVAL;
 		goto out;
 	}

 	err = drv->ops->auth(&drv->wiphy, dev, &req);

 out:
 	cfg80211_put_dev(drv);
 	dev_put(dev);
 unlock_rtnl:
 	rtnl_unlock();
 	return err;
 }

 static int nl80211_crypto_settings(struct genl_info *info,
 				   struct cfg80211_crypto_settings *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 > NL80211_MAX_NR_CIPHER_SUITES)
 			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 *drv;
 	struct net_device *dev;
 	struct cfg80211_assoc_request req;
 	struct wiphy *wiphy;
 	int err;

 	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
 		return -EINVAL;

 	if (!info->attrs[NL80211_ATTR_MAC] ||
 	    !info->attrs[NL80211_ATTR_SSID])
 		return -EINVAL;

 	rtnl_lock();

 	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	if (!drv->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;
 	}

 	wiphy = &drv->wiphy;
 	memset(&req, 0, sizeof(req));

 	req.peer_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);

 	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
 		req.chan = ieee80211_get_channel(
 			wiphy,
 			nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]));
 		if (!req.chan) {
 			err = -EINVAL;
 			goto out;
 		}
 	}

 	req.ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
 	req.ssid_len = nla_len(info->attrs[NL80211_ATTR_SSID]);

 	if (info->attrs[NL80211_ATTR_IE]) {
 		req.ie = nla_data(info->attrs[NL80211_ATTR_IE]);
 		req.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
 	}

 	if (info->attrs[NL80211_ATTR_USE_MFP]) {
 		enum nl80211_mfp use_mfp =
 			nla_get_u32(info->attrs[NL80211_ATTR_USE_MFP]);
 		if (use_mfp == NL80211_MFP_REQUIRED)
 			req.use_mfp = true;
 		else if (use_mfp != NL80211_MFP_NO) {
 			err = -EINVAL;
 			goto out;
 		}
 	}

 	err = nl80211_crypto_settings(info, &req.crypto);
 	if (!err)
 		err = drv->ops->assoc(&drv->wiphy, dev, &req);

 out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	struct net_device *dev;
 	struct cfg80211_deauth_request req;
 	struct wiphy *wiphy;
 	int err;

 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	if (!drv->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;
 	}

 	wiphy = &drv->wiphy;
 	memset(&req, 0, sizeof(req));

 	req.peer_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);

 	req.reason_code = nla_get_u16(info->attrs[NL80211_ATTR_REASON_CODE]);
 	if (req.reason_code == 0) {
 		/* Reason Code 0 is reserved */
 		err = -EINVAL;
 		goto out;
 	}

 	if (info->attrs[NL80211_ATTR_IE]) {
 		req.ie = nla_data(info->attrs[NL80211_ATTR_IE]);
 		req.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
 	}

 	err = drv->ops->deauth(&drv->wiphy, dev, &req);

 out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	struct net_device *dev;
 	struct cfg80211_disassoc_request req;
 	struct wiphy *wiphy;
 	int err;

 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	if (!drv->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;
 	}

 	wiphy = &drv->wiphy;
 	memset(&req, 0, sizeof(req));

 	req.peer_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);

 	req.reason_code = nla_get_u16(info->attrs[NL80211_ATTR_REASON_CODE]);
 	if (req.reason_code == 0) {
 		/* Reason Code 0 is reserved */
 		err = -EINVAL;
 		goto out;
 	}

 	if (info->attrs[NL80211_ATTR_IE]) {
 		req.ie = nla_data(info->attrs[NL80211_ATTR_IE]);
 		req.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
 	}

 	err = drv->ops->disassoc(&drv->wiphy, dev, &req);

 out:
 	cfg80211_put_dev(drv);
 	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 *drv;
 	struct net_device *dev;
 	struct cfg80211_ibss_params ibss;
 	struct wiphy *wiphy;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	if (!drv->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 = &drv->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];

 	err = cfg80211_join_ibss(drv, dev, &ibss);

 out:
 	cfg80211_put_dev(drv);
 	dev_put(dev);
 unlock_rtnl:
 	rtnl_unlock();
 	return err;
 }

 static int nl80211_leave_ibss(struct sk_buff *skb, struct genl_info *info)
 {
 	struct cfg80211_registered_device *drv;
 	struct net_device *dev;
 	int err;

 	rtnl_lock();

 	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
 	if (err)
 		goto unlock_rtnl;

 	if (!drv->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(drv, dev, false);

 out:
 	cfg80211_put_dev(drv);
 	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_put_dev(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 *drv;
 	struct net_device *dev;
 	struct cfg80211_connect_params connect;
 	struct wiphy *wiphy;
 	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);
 	if (err)
 		return err;
 	rtnl_lock();

 	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &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 = &drv->wiphy;

 	connect.bssid = NULL;
 	connect.channel = NULL;
 	connect.auth_type = NL80211_AUTHTYPE_OPEN_SYSTEM;

 	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;
 		}
 	}

 	err = cfg80211_connect(drv, dev, &connect);

 out:
 	cfg80211_put_dev(drv);
 	dev_put(dev);
 unlock_rtnl:
 	rtnl_unlock();
 	return err;
 }

 static int nl80211_disconnect(struct sk_buff *skb, struct genl_info *info)
 {
 	struct cfg80211_registered_device *drv;
 	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_drv_dev_by_info_ifindex(info->attrs, &drv, &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(drv, dev, reason, true);

 out:
 	cfg80211_put_dev(drv);
 	dev_put(dev);
 unlock_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,
 	},
 };
 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(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;

 	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(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(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(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;
 	}

 	genlmsg_multicast(msg, 0, nl80211_regulatory_mcgrp.id, GFP_KERNEL);

 	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(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(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(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(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,
 			       u8 *ie, size_t ie_len, bool from_ap, 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_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(msg, 0, nl80211_mlme_mcgrp.id, gfp);
 	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(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(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;
 	}

 	genlmsg_multicast(msg, 0, nl80211_regulatory_mcgrp.id, GFP_ATOMIC);

 	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);
 }