/*
   * 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 },

  };

  /* 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
  	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)) {
  		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, ifindex;

  	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;

  	ifindex = dev->ifindex;

  	otype = ntype = dev->ieee80211_ptr->iftype;

  	dev_put(dev);

  	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, ifindex,

  						    ntype, flags, &params);

  	else
  		err = 0;

  
  	dev = __dev_get_by_index(&init_net, ifindex);

  	WARN_ON(!dev || (!err && dev->ieee80211_ptr->iftype != ntype));
  
  	if (dev && !err && (ntype != otype)) {
  		if (otype == NL80211_IFTYPE_ADHOC)

  			cfg80211_clear_ibss(dev, false);

  	}

   unlock:
  	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 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 = 0, 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]) {
  		nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_FREQUENCIES], tmp)
  			n_channels++;
  		if (!n_channels) {
  			err = -EINVAL;

  			goto out;

  		}
  	} else {
  		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);
  
   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_OPEN_SYSTEM ||
  		auth_type == NL80211_AUTHTYPE_SHARED_KEY ||
  		auth_type == NL80211_AUTHTYPE_FT ||
  		auth_type == NL80211_AUTHTYPE_NETWORK_EAP;
  }