nl80211.c 157 KB
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/*
 * This is the new netlink-based wireless configuration interface.
 *
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 * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
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 */

#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
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#include <linux/slab.h>
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#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>
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#include <linux/etherdevice.h>
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#include <net/net_namespace.h>
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#include <net/genetlink.h>
#include <net/cfg80211.h>
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#include <net/sock.h>
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#include "core.h"
#include "nl80211.h"
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#include "reg.h"
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static int nl80211_pre_doit(struct genl_ops *ops, struct sk_buff *skb,
			    struct genl_info *info);
static void nl80211_post_doit(struct genl_ops *ops, struct sk_buff *skb,
			      struct genl_info *info);

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/* 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,
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	.netnsok = true,
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	.pre_doit = nl80211_pre_doit,
	.post_doit = nl80211_post_doit,
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};

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/* internal helper: get rdev and dev */
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static int get_rdev_dev_by_info_ifindex(struct genl_info *info,
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				       struct cfg80211_registered_device **rdev,
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				       struct net_device **dev)
{
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	struct nlattr **attrs = info->attrs;
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	int ifindex;

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

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

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	*rdev = cfg80211_get_dev_from_ifindex(genl_info_net(info), ifindex);
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	if (IS_ERR(*rdev)) {
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		dev_put(*dev);
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		return PTR_ERR(*rdev);
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	}

	return 0;
}

/* policy for the attributes */
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static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
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	[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
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				      .len = 20-1 },
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	[NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
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	[NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
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	[NL80211_ATTR_WIPHY_CHANNEL_TYPE] = { .type = NLA_U32 },
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	[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 },
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	[NL80211_ATTR_WIPHY_COVERAGE_CLASS] = { .type = NLA_U8 },
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	[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
	[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
	[NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
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	[NL80211_ATTR_MAC] = { .type = NLA_BINARY, .len = ETH_ALEN },
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	[NL80211_ATTR_PREV_BSSID] = { .type = NLA_BINARY, .len = ETH_ALEN },
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	[NL80211_ATTR_KEY] = { .type = NLA_NESTED, },
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	[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 },
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	[NL80211_ATTR_KEY_SEQ] = { .type = NLA_BINARY, .len = 8 },
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	[NL80211_ATTR_KEY_TYPE] = { .type = NLA_U32 },
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	[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 },
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	[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 },
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	[NL80211_ATTR_STA_PLINK_ACTION] = { .type = NLA_U8 },
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	[NL80211_ATTR_STA_VLAN] = { .type = NLA_U32 },
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	[NL80211_ATTR_MNTR_FLAGS] = { /* NLA_NESTED can't be empty */ },
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	[NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY,
				.len = IEEE80211_MAX_MESH_ID_LEN },
	[NL80211_ATTR_MPATH_NEXT_HOP] = { .type = NLA_U32 },
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	[NL80211_ATTR_REG_ALPHA2] = { .type = NLA_STRING, .len = 2 },
	[NL80211_ATTR_REG_RULES] = { .type = NLA_NESTED },

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	[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 },
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	[NL80211_ATTR_BSS_BASIC_RATES] = { .type = NLA_BINARY,
					   .len = NL80211_MAX_SUPP_RATES },
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	[NL80211_ATTR_BSS_HT_OPMODE] = { .type = NLA_U16 },
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	[NL80211_ATTR_MESH_CONFIG] = { .type = NLA_NESTED },
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	[NL80211_ATTR_HT_CAPABILITY] = { .type = NLA_BINARY,
					 .len = NL80211_HT_CAPABILITY_LEN },
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	[NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
	[NL80211_ATTR_IE] = { .type = NLA_BINARY,
			      .len = IEEE80211_MAX_DATA_LEN },
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	[NL80211_ATTR_SCAN_FREQUENCIES] = { .type = NLA_NESTED },
	[NL80211_ATTR_SCAN_SSIDS] = { .type = NLA_NESTED },
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	[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 },
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	[NL80211_ATTR_FREQ_FIXED] = { .type = NLA_FLAG },
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	[NL80211_ATTR_TIMED_OUT] = { .type = NLA_FLAG },
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	[NL80211_ATTR_USE_MFP] = { .type = NLA_U32 },
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	[NL80211_ATTR_STA_FLAGS2] = {
		.len = sizeof(struct nl80211_sta_flag_update),
	},
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	[NL80211_ATTR_CONTROL_PORT] = { .type = NLA_FLAG },
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	[NL80211_ATTR_CONTROL_PORT_ETHERTYPE] = { .type = NLA_U16 },
	[NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT] = { .type = NLA_FLAG },
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	[NL80211_ATTR_PRIVACY] = { .type = NLA_FLAG },
	[NL80211_ATTR_CIPHER_SUITE_GROUP] = { .type = NLA_U32 },
	[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
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	[NL80211_ATTR_PID] = { .type = NLA_U32 },
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	[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
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	[NL80211_ATTR_PMKID] = { .type = NLA_BINARY,
				 .len = WLAN_PMKID_LEN },
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	[NL80211_ATTR_DURATION] = { .type = NLA_U32 },
	[NL80211_ATTR_COOKIE] = { .type = NLA_U64 },
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	[NL80211_ATTR_TX_RATES] = { .type = NLA_NESTED },
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	[NL80211_ATTR_FRAME] = { .type = NLA_BINARY,
				 .len = IEEE80211_MAX_DATA_LEN },
	[NL80211_ATTR_FRAME_MATCH] = { .type = NLA_BINARY, },
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	[NL80211_ATTR_PS_STATE] = { .type = NLA_U32 },
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	[NL80211_ATTR_CQM] = { .type = NLA_NESTED, },
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	[NL80211_ATTR_LOCAL_STATE_CHANGE] = { .type = NLA_FLAG },
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	[NL80211_ATTR_AP_ISOLATE] = { .type = NLA_U8 },
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	[NL80211_ATTR_WIPHY_TX_POWER_SETTING] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_TX_POWER_LEVEL] = { .type = NLA_U32 },
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	[NL80211_ATTR_FRAME_TYPE] = { .type = NLA_U16 },
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	[NL80211_ATTR_WIPHY_ANTENNA_TX] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_ANTENNA_RX] = { .type = NLA_U32 },
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	[NL80211_ATTR_MCAST_RATE] = { .type = NLA_U32 },
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	[NL80211_ATTR_OFFCHANNEL_TX_OK] = { .type = NLA_FLAG },
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	[NL80211_ATTR_KEY_DEFAULT_TYPES] = { .type = NLA_NESTED },
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};

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/* policy for the key attributes */
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static const struct nla_policy nl80211_key_policy[NL80211_KEY_MAX + 1] = {
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	[NL80211_KEY_DATA] = { .type = NLA_BINARY, .len = WLAN_MAX_KEY_LEN },
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	[NL80211_KEY_IDX] = { .type = NLA_U8 },
	[NL80211_KEY_CIPHER] = { .type = NLA_U32 },
	[NL80211_KEY_SEQ] = { .type = NLA_BINARY, .len = 8 },
	[NL80211_KEY_DEFAULT] = { .type = NLA_FLAG },
	[NL80211_KEY_DEFAULT_MGMT] = { .type = NLA_FLAG },
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	[NL80211_KEY_TYPE] = { .type = NLA_U32 },
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	[NL80211_KEY_DEFAULT_TYPES] = { .type = NLA_NESTED },
};

/* policy for the key default flags */
static const struct nla_policy
nl80211_key_default_policy[NUM_NL80211_KEY_DEFAULT_TYPES] = {
	[NL80211_KEY_DEFAULT_TYPE_UNICAST] = { .type = NLA_FLAG },
	[NL80211_KEY_DEFAULT_TYPE_MULTICAST] = { .type = NLA_FLAG },
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};

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/* ifidx get helper */
static int nl80211_get_ifidx(struct netlink_callback *cb)
{
	int res;

	res = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
			  nl80211_fam.attrbuf, nl80211_fam.maxattr,
			  nl80211_policy);
	if (res)
		return res;

	if (!nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX])
		return -EINVAL;

	res = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX]);
	if (!res)
		return -EINVAL;
	return res;
}

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static int nl80211_prepare_netdev_dump(struct sk_buff *skb,
				       struct netlink_callback *cb,
				       struct cfg80211_registered_device **rdev,
				       struct net_device **dev)
{
	int ifidx = cb->args[0];
	int err;

	if (!ifidx)
		ifidx = nl80211_get_ifidx(cb);
	if (ifidx < 0)
		return ifidx;

	cb->args[0] = ifidx;

	rtnl_lock();

	*dev = __dev_get_by_index(sock_net(skb->sk), ifidx);
	if (!*dev) {
		err = -ENODEV;
		goto out_rtnl;
	}

	*rdev = cfg80211_get_dev_from_ifindex(sock_net(skb->sk), ifidx);
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	if (IS_ERR(*rdev)) {
		err = PTR_ERR(*rdev);
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		goto out_rtnl;
	}

	return 0;
 out_rtnl:
	rtnl_unlock();
	return err;
}

static void nl80211_finish_netdev_dump(struct cfg80211_registered_device *rdev)
{
	cfg80211_unlock_rdev(rdev);
	rtnl_unlock();
}

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/* 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;
}

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/* 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);
}

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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;
}

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/* netlink command implementations */

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struct key_parse {
	struct key_params p;
	int idx;
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	int type;
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	bool def, defmgmt;
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	bool def_uni, def_multi;
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};

static int nl80211_parse_key_new(struct nlattr *key, struct key_parse *k)
{
	struct nlattr *tb[NL80211_KEY_MAX + 1];
	int err = nla_parse_nested(tb, NL80211_KEY_MAX, key,
				   nl80211_key_policy);
	if (err)
		return err;

	k->def = !!tb[NL80211_KEY_DEFAULT];
	k->defmgmt = !!tb[NL80211_KEY_DEFAULT_MGMT];

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	if (k->def) {
		k->def_uni = true;
		k->def_multi = true;
	}
	if (k->defmgmt)
		k->def_multi = true;

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	if (tb[NL80211_KEY_IDX])
		k->idx = nla_get_u8(tb[NL80211_KEY_IDX]);

	if (tb[NL80211_KEY_DATA]) {
		k->p.key = nla_data(tb[NL80211_KEY_DATA]);
		k->p.key_len = nla_len(tb[NL80211_KEY_DATA]);
	}

	if (tb[NL80211_KEY_SEQ]) {
		k->p.seq = nla_data(tb[NL80211_KEY_SEQ]);
		k->p.seq_len = nla_len(tb[NL80211_KEY_SEQ]);
	}

	if (tb[NL80211_KEY_CIPHER])
		k->p.cipher = nla_get_u32(tb[NL80211_KEY_CIPHER]);

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	if (tb[NL80211_KEY_TYPE]) {
		k->type = nla_get_u32(tb[NL80211_KEY_TYPE]);
		if (k->type < 0 || k->type >= NUM_NL80211_KEYTYPES)
			return -EINVAL;
	}

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	if (tb[NL80211_KEY_DEFAULT_TYPES]) {
		struct nlattr *kdt[NUM_NL80211_KEY_DEFAULT_TYPES];
		int err = nla_parse_nested(kdt,
					   NUM_NL80211_KEY_DEFAULT_TYPES - 1,
					   tb[NL80211_KEY_DEFAULT_TYPES],
					   nl80211_key_default_policy);
		if (err)
			return err;

		k->def_uni = kdt[NL80211_KEY_DEFAULT_TYPE_UNICAST];
		k->def_multi = kdt[NL80211_KEY_DEFAULT_TYPE_MULTICAST];
	}

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	return 0;
}

static int nl80211_parse_key_old(struct genl_info *info, struct key_parse *k)
{
	if (info->attrs[NL80211_ATTR_KEY_DATA]) {
		k->p.key = nla_data(info->attrs[NL80211_ATTR_KEY_DATA]);
		k->p.key_len = nla_len(info->attrs[NL80211_ATTR_KEY_DATA]);
	}

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

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

	if (info->attrs[NL80211_ATTR_KEY_CIPHER])
		k->p.cipher = nla_get_u32(info->attrs[NL80211_ATTR_KEY_CIPHER]);

	k->def = !!info->attrs[NL80211_ATTR_KEY_DEFAULT];
	k->defmgmt = !!info->attrs[NL80211_ATTR_KEY_DEFAULT_MGMT];

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	if (k->def) {
		k->def_uni = true;
		k->def_multi = true;
	}
	if (k->defmgmt)
		k->def_multi = true;

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	if (info->attrs[NL80211_ATTR_KEY_TYPE]) {
		k->type = nla_get_u32(info->attrs[NL80211_ATTR_KEY_TYPE]);
		if (k->type < 0 || k->type >= NUM_NL80211_KEYTYPES)
			return -EINVAL;
	}

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	if (info->attrs[NL80211_ATTR_KEY_DEFAULT_TYPES]) {
		struct nlattr *kdt[NUM_NL80211_KEY_DEFAULT_TYPES];
		int err = nla_parse_nested(
				kdt, NUM_NL80211_KEY_DEFAULT_TYPES - 1,
				info->attrs[NL80211_ATTR_KEY_DEFAULT_TYPES],
				nl80211_key_default_policy);
		if (err)
			return err;

		k->def_uni = kdt[NL80211_KEY_DEFAULT_TYPE_UNICAST];
		k->def_multi = kdt[NL80211_KEY_DEFAULT_TYPE_MULTICAST];
	}

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	return 0;
}

static int nl80211_parse_key(struct genl_info *info, struct key_parse *k)
{
	int err;

	memset(k, 0, sizeof(*k));
	k->idx = -1;
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	k->type = -1;
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	if (info->attrs[NL80211_ATTR_KEY])
		err = nl80211_parse_key_new(info->attrs[NL80211_ATTR_KEY], k);
	else
		err = nl80211_parse_key_old(info, k);

	if (err)
		return err;

	if (k->def && k->defmgmt)
		return -EINVAL;

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	if (k->defmgmt) {
		if (k->def_uni || !k->def_multi)
			return -EINVAL;
	}

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	if (k->idx != -1) {
		if (k->defmgmt) {
			if (k->idx < 4 || k->idx > 5)
				return -EINVAL;
		} else if (k->def) {
			if (k->idx < 0 || k->idx > 3)
				return -EINVAL;
		} else {
			if (k->idx < 0 || k->idx > 5)
				return -EINVAL;
		}
	}

	return 0;
}

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static struct cfg80211_cached_keys *
nl80211_parse_connkeys(struct cfg80211_registered_device *rdev,
		       struct nlattr *keys)
{
	struct key_parse parse;
	struct nlattr *key;
	struct cfg80211_cached_keys *result;
	int rem, err, def = 0;

	result = kzalloc(sizeof(*result), GFP_KERNEL);
	if (!result)
		return ERR_PTR(-ENOMEM);

	result->def = -1;
	result->defmgmt = -1;

	nla_for_each_nested(key, keys, rem) {
		memset(&parse, 0, sizeof(parse));
		parse.idx = -1;

		err = nl80211_parse_key_new(key, &parse);
		if (err)
			goto error;
		err = -EINVAL;
		if (!parse.p.key)
			goto error;
		if (parse.idx < 0 || parse.idx > 4)
			goto error;
		if (parse.def) {
			if (def)
				goto error;
			def = 1;
			result->def = parse.idx;
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			if (!parse.def_uni || !parse.def_multi)
				goto error;
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		} else if (parse.defmgmt)
			goto error;
		err = cfg80211_validate_key_settings(rdev, &parse.p,
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						     parse.idx, false, NULL);
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		if (err)
			goto error;
		result->params[parse.idx].cipher = parse.p.cipher;
		result->params[parse.idx].key_len = parse.p.key_len;
		result->params[parse.idx].key = result->data[parse.idx];
		memcpy(result->data[parse.idx], parse.p.key, parse.p.key_len);
	}

	return result;
 error:
	kfree(result);
	return ERR_PTR(err);
}

static int nl80211_key_allowed(struct wireless_dev *wdev)
{
	ASSERT_WDEV_LOCK(wdev);

	switch (wdev->iftype) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_AP_VLAN:
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	case NL80211_IFTYPE_P2P_GO:
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		break;
	case NL80211_IFTYPE_ADHOC:
		if (!wdev->current_bss)
			return -ENOLINK;
		break;
	case NL80211_IFTYPE_STATION:
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	case NL80211_IFTYPE_P2P_CLIENT:
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		if (wdev->sme_state != CFG80211_SME_CONNECTED)
			return -ENOLINK;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

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static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
			      struct cfg80211_registered_device *dev)
{
	void *hdr;
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	struct nlattr *nl_bands, *nl_band;
	struct nlattr *nl_freqs, *nl_freq;
	struct nlattr *nl_rates, *nl_rate;
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	struct nlattr *nl_modes;
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	struct nlattr *nl_cmds;
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	enum ieee80211_band band;
	struct ieee80211_channel *chan;
	struct ieee80211_rate *rate;
	int i;
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	u16 ifmodes = dev->wiphy.interface_modes;
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	const struct ieee80211_txrx_stypes *mgmt_stypes =
				dev->wiphy.mgmt_stypes;
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	hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_WIPHY);
	if (!hdr)
		return -1;

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	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, dev->wiphy_idx);
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	NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
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	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION,
		    cfg80211_rdev_list_generation);

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	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);
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	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS,
		    dev->wiphy.coverage_class);
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	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
		   dev->wiphy.max_scan_ssids);
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	NLA_PUT_U16(msg, NL80211_ATTR_MAX_SCAN_IE_LEN,
		    dev->wiphy.max_scan_ie_len);
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	if (dev->wiphy.flags & WIPHY_FLAG_IBSS_RSN)
		NLA_PUT_FLAG(msg, NL80211_ATTR_SUPPORT_IBSS_RSN);

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	NLA_PUT(msg, NL80211_ATTR_CIPHER_SUITES,
		sizeof(u32) * dev->wiphy.n_cipher_suites,
		dev->wiphy.cipher_suites);

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	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_PMKIDS,
		   dev->wiphy.max_num_pmkids);

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	if (dev->wiphy.flags & WIPHY_FLAG_CONTROL_PORT_PROTOCOL)
		NLA_PUT_FLAG(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE);

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	if ((dev->wiphy.available_antennas_tx ||
	     dev->wiphy.available_antennas_rx) && dev->ops->get_antenna) {
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		u32 tx_ant = 0, rx_ant = 0;
		int res;
		res = dev->ops->get_antenna(&dev->wiphy, &tx_ant, &rx_ant);
		if (!res) {
			NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_ANTENNA_TX, tx_ant);
			NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_ANTENNA_RX, rx_ant);
		}
	}

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	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);

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	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;

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		/* 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);
		}

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		/* 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];
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			if (nl80211_msg_put_channel(msg, chan))
				goto nla_put_failure;
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			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);

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	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);
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	CMD(update_mesh_config, SET_MESH_CONFIG);
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	CMD(change_bss, SET_BSS);
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	CMD(auth, AUTHENTICATE);
	CMD(assoc, ASSOCIATE);
	CMD(deauth, DEAUTHENTICATE);
	CMD(disassoc, DISASSOCIATE);
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	CMD(join_ibss, JOIN_IBSS);
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	CMD(join_mesh, JOIN_MESH);
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	CMD(set_pmksa, SET_PMKSA);
	CMD(del_pmksa, DEL_PMKSA);
	CMD(flush_pmksa, FLUSH_PMKSA);
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	CMD(remain_on_channel, REMAIN_ON_CHANNEL);
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	CMD(set_bitrate_mask, SET_TX_BITRATE_MASK);
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	CMD(mgmt_tx, FRAME);
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	CMD(mgmt_tx_cancel_wait, FRAME_WAIT_CANCEL);
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	if (dev->wiphy.flags & WIPHY_FLAG_NETNS_OK) {
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		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_SET_WIPHY_NETNS);
	}
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	CMD(set_channel, SET_CHANNEL);
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	CMD(set_wds_peer, SET_WDS_PEER);
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#undef CMD
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	if (dev->ops->connect || dev->ops->auth) {
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		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_CONNECT);
	}

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	if (dev->ops->disconnect || dev->ops->deauth) {
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		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_DISCONNECT);
	}

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	nla_nest_end(msg, nl_cmds);

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	if (dev->ops->remain_on_channel)
		NLA_PUT_U32(msg, NL80211_ATTR_MAX_REMAIN_ON_CHANNEL_DURATION,
			    dev->wiphy.max_remain_on_channel_duration);

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	/* for now at least assume all drivers have it */
	if (dev->ops->mgmt_tx)
		NLA_PUT_FLAG(msg, NL80211_ATTR_OFFCHANNEL_TX_OK);

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	if (mgmt_stypes) {
		u16 stypes;
		struct nlattr *nl_ftypes, *nl_ifs;
		enum nl80211_iftype ift;

		nl_ifs = nla_nest_start(msg, NL80211_ATTR_TX_FRAME_TYPES);
		if (!nl_ifs)
			goto nla_put_failure;

		for (ift = 0; ift < NUM_NL80211_IFTYPES; ift++) {
			nl_ftypes = nla_nest_start(msg, ift);
			if (!nl_ftypes)
				goto nla_put_failure;
			i = 0;
			stypes = mgmt_stypes[ift].tx;
			while (stypes) {
				if (stypes & 1)
					NLA_PUT_U16(msg, NL80211_ATTR_FRAME_TYPE,
						    (i << 4) | IEEE80211_FTYPE_MGMT);
				stypes >>= 1;
				i++;
			}
			nla_nest_end(msg, nl_ftypes);
		}

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		nla_nest_end(msg, nl_ifs);

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		nl_ifs = nla_nest_start(msg, NL80211_ATTR_RX_FRAME_TYPES);
		if (!nl_ifs)
			goto nla_put_failure;

		for (ift = 0; ift < NUM_NL80211_IFTYPES; ift++) {
			nl_ftypes = nla_nest_start(msg, ift);
			if (!nl_ftypes)
				goto nla_put_failure;
			i = 0;
			stypes = mgmt_stypes[ift].rx;
			while (stypes) {
				if (stypes & 1)
					NLA_PUT_U16(msg, NL80211_ATTR_FRAME_TYPE,
						    (i << 4) | IEEE80211_FTYPE_MGMT);
				stypes >>= 1;
				i++;
			}
			nla_nest_end(msg, nl_ftypes);
		}
		nla_nest_end(msg, nl_ifs);
	}

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	return genlmsg_end(msg, hdr);

 nla_put_failure:
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	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
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}

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;

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	mutex_lock(&cfg80211_mutex);
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	list_for_each_entry(dev, &cfg80211_rdev_list, list) {
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		if (!net_eq(wiphy_net(&dev->wiphy), sock_net(skb->sk)))
			continue;
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		if (++idx <= start)
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			continue;
		if (nl80211_send_wiphy(skb, NETLINK_CB(cb->skb).pid,
				       cb->nlh->nlmsg_seq, NLM_F_MULTI,
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				       dev) < 0) {
			idx--;
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			break;
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		}
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	}
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	mutex_unlock(&cfg80211_mutex);
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	cb->args[0] = idx;

	return skb->len;
}

static int nl80211_get_wiphy(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *msg;
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	struct cfg80211_registered_device *dev = info->user_ptr[0];
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854
	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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	if (!msg)
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		return -ENOMEM;
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	if (nl80211_send_wiphy(msg, info->snd_pid, info->snd_seq, 0, dev) < 0) {
		nlmsg_free(msg);
		return -ENOBUFS;
	}
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	return genlmsg_reply(msg, info);
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}

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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;
}

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static bool nl80211_can_set_dev_channel(struct wireless_dev *wdev)
{
	/*
	 * You can only set the channel explicitly for AP, mesh
	 * and WDS type interfaces; all others have their channel
	 * managed via their respective "establish a connection"
	 * command (connect, join, ...)
	 *
	 * Monitors are special as they are normally slaved to
	 * whatever else is going on, so they behave as though
	 * you tried setting the wiphy channel itself.
	 */
	return !wdev ||
		wdev->iftype == NL80211_IFTYPE_AP ||
		wdev->iftype == NL80211_IFTYPE_WDS ||
		wdev->iftype == NL80211_IFTYPE_MESH_POINT ||
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		wdev->iftype == NL80211_IFTYPE_MONITOR ||
		wdev->iftype == NL80211_IFTYPE_P2P_GO;
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}

static int __nl80211_set_channel(struct cfg80211_registered_device *rdev,
				 struct wireless_dev *wdev,
				 struct genl_info *info)
{
	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
	u32 freq;
	int result;

	if (!info->attrs[NL80211_ATTR_WIPHY_FREQ])
		return -EINVAL;

	if (!nl80211_can_set_dev_channel(wdev))
		return -EOPNOTSUPP;

	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)
			return -EINVAL;
	}

	freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);

	mutex_lock(&rdev->devlist_mtx);
	if (wdev) {
		wdev_lock(wdev);
		result = cfg80211_set_freq(rdev, wdev, freq, channel_type);
		wdev_unlock(wdev);
	} else {
		result = cfg80211_set_freq(rdev, NULL, freq, channel_type);
	}
	mutex_unlock(&rdev->devlist_mtx);

	return result;
}

static int nl80211_set_channel(struct sk_buff *skb, struct genl_info *info)
{
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	struct cfg80211_registered_device *rdev = info->user_ptr[0];
	struct net_device *netdev = info->user_ptr[1];
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955
	return __nl80211_set_channel(rdev, netdev->ieee80211_ptr, info);
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}

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static int nl80211_set_wds_peer(struct sk_buff *skb, struct genl_info *info)
{
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	struct cfg80211_registered_device *rdev = info->user_ptr[0];
	struct net_device *dev = info->user_ptr[1];
	struct wireless_dev *wdev = dev->ieee80211_ptr;
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	const u8 *bssid;
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	if (!info->attrs[NL80211_ATTR_MAC])
		return -EINVAL;

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	if (netif_running(dev))
		return -EBUSY;
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	if (!rdev->ops->set_wds_peer)
		return -EOPNOTSUPP;
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	if (wdev->iftype != NL80211_IFTYPE_WDS)
		return -EOPNOTSUPP;
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	bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
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	return rdev->ops->set_wds_peer(wdev->wiphy, dev, bssid);
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}


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static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
{
	struct cfg80211_registered_device *rdev;
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	struct net_device *netdev = NULL;
	struct wireless_dev *wdev;
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987
	int result = 0, rem_txq_params = 0;
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	struct nlattr *nl_txq_params;
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	u32 changed;
	u8 retry_short = 0, retry_long = 0;
	u32 frag_threshold = 0, rts_threshold = 0;
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	u8 coverage_class = 0;
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	/*
	 * Try to find the wiphy and netdev. Normally this
	 * function shouldn't need the netdev, but this is
	 * done for backward compatibility -- previously
	 * setting the channel was done per wiphy, but now
	 * it is per netdev. Previous userland like hostapd
	 * also passed a netdev to set_wiphy, so that it is
	 * possible to let that go to the right netdev!
	 */
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	mutex_lock(&cfg80211_mutex);

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	if (info->attrs[NL80211_ATTR_IFINDEX]) {
		int ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);

		netdev = dev_get_by_index(genl_info_net(info), ifindex);
		if (netdev && netdev->ieee80211_ptr) {
			rdev = wiphy_to_dev(netdev->ieee80211_ptr->wiphy);
			mutex_lock(&rdev->mtx);
		} else
			netdev = NULL;
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	}

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	if (!netdev) {
		rdev = __cfg80211_rdev_from_info(info);
		if (IS_ERR(rdev)) {
			mutex_unlock(&cfg80211_mutex);
1020
			return PTR_ERR(rdev);
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		}
		wdev = NULL;
		netdev = NULL;
		result = 0;

		mutex_lock(&rdev->mtx);
	} else if (netif_running(netdev) &&
		   nl80211_can_set_dev_channel(netdev->ieee80211_ptr))
		wdev = netdev->ieee80211_ptr;
	else
		wdev = NULL;

	/*
	 * end workaround code, by now the rdev is available
	 * and locked, and wdev may or may not be NULL.
	 */
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	if (info->attrs[NL80211_ATTR_WIPHY_NAME])
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		result = cfg80211_dev_rename(
			rdev, nla_data(info->attrs[NL80211_ATTR_WIPHY_NAME]));
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	mutex_unlock(&cfg80211_mutex);

	if (result)
		goto bad_res;
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	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;
		}
	}
1073

1074
	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
1075
		result = __nl80211_set_channel(rdev, wdev, info);
1076 1077 1078 1079
		if (result)
			goto bad_res;
	}

1080 1081 1082 1083 1084
	if (info->attrs[NL80211_ATTR_WIPHY_TX_POWER_SETTING]) {
		enum nl80211_tx_power_setting type;
		int idx, mbm = 0;

		if (!rdev->ops->set_tx_power) {
1085
			result = -EOPNOTSUPP;
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
			goto bad_res;
		}

		idx = NL80211_ATTR_WIPHY_TX_POWER_SETTING;
		type = nla_get_u32(info->attrs[idx]);

		if (!info->attrs[NL80211_ATTR_WIPHY_TX_POWER_LEVEL] &&
		    (type != NL80211_TX_POWER_AUTOMATIC)) {
			result = -EINVAL;
			goto bad_res;
		}

		if (type != NL80211_TX_POWER_AUTOMATIC) {
			idx = NL80211_ATTR_WIPHY_TX_POWER_LEVEL;
			mbm = nla_get_u32(info->attrs[idx]);
		}

		result = rdev->ops->set_tx_power(&rdev->wiphy, type, mbm);
		if (result)
			goto bad_res;
	}

1108 1109 1110
	if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX] &&
	    info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]) {
		u32 tx_ant, rx_ant;
1111 1112 1113
		if ((!rdev->wiphy.available_antennas_tx &&
		     !rdev->wiphy.available_antennas_rx) ||
		    !rdev->ops->set_antenna) {
1114 1115 1116 1117 1118 1119 1120
			result = -EOPNOTSUPP;
			goto bad_res;
		}

		tx_ant = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX]);
		rx_ant = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]);

1121
		/* reject antenna configurations which don't match the
1122 1123 1124
		 * available antenna masks, except for the "all" mask */
		if ((~tx_ant && (tx_ant & ~rdev->wiphy.available_antennas_tx)) ||
		    (~rx_ant && (rx_ant & ~rdev->wiphy.available_antennas_rx))) {
1125 1126 1127 1128
			result = -EINVAL;
			goto bad_res;
		}

1129 1130
		tx_ant = tx_ant & rdev->wiphy.available_antennas_tx;
		rx_ant = rx_ant & rdev->wiphy.available_antennas_rx;
1131

1132 1133 1134 1135 1136
		result = rdev->ops->set_antenna(&rdev->wiphy, tx_ant, rx_ant);
		if (result)
			goto bad_res;
	}

1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
	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;
	}

1184 1185 1186 1187 1188 1189
	if (info->attrs[NL80211_ATTR_WIPHY_COVERAGE_CLASS]) {
		coverage_class = nla_get_u8(
			info->attrs[NL80211_ATTR_WIPHY_COVERAGE_CLASS]);
		changed |= WIPHY_PARAM_COVERAGE_CLASS;
	}

1190 1191 1192
	if (changed) {
		u8 old_retry_short, old_retry_long;