util.c - platform/external/iw - Gitiles

 #include <ctype.h>
 #include <netlink/attr.h>
 #include <errno.h>
 #include <stdbool.h>
 #include "iw.h"
 #include "nl80211.h"

 void mac_addr_n2a(char *mac_addr, unsigned char *arg)
 {
 	int i, l;

 	l = 0;
 	for (i = 0; i < ETH_ALEN ; i++) {
 		if (i == 0) {
 			sprintf(mac_addr+l, "%02x", arg[i]);
 			l += 2;
 		} else {
 			sprintf(mac_addr+l, ":%02x", arg[i]);
 			l += 3;
 		}
 	}
 }

 int mac_addr_a2n(unsigned char *mac_addr, char *arg)
 {
 	int i;

 	for (i = 0; i < ETH_ALEN ; i++) {
 		int temp;
 		char *cp = strchr(arg, ':');
 		if (cp) {
 			*cp = 0;
 			cp++;
 		}
 		if (sscanf(arg, "%x", &temp) != 1)
 			return -1;
 		if (temp < 0 || temp > 255)
 			return -1;

 		mac_addr[i] = temp;
 		if (!cp)
 			break;
 		arg = cp;
 	}
 	if (i < ETH_ALEN - 1)
 		return -1;

 	return 0;
 }

 unsigned char *parse_hex(char *hex, size_t *outlen)
 {
 	size_t len = strlen(hex);
 	unsigned char *result = calloc(len/2 + 2, 1);
 	int pos = 0;

 	if (!result)
 		return NULL;

 	*outlen = 0;

 	while (1) {
 		int temp;
 		char *cp = strchr(hex, ':');
 		if (cp) {
 			*cp = 0;
 			cp++;
 		}
 		if (sscanf(hex, "%x", &temp) != 1)
 			goto error;
 		if (temp < 0 || temp > 255)
 			goto error;

 		(*outlen)++;

 		result[pos++] = temp;
 		if (!cp)
 			break;
 		hex = cp;
 	}

 	return result;
  error:
 	free(result);
 	return NULL;
 }

 static const char *ifmodes[NL80211_IFTYPE_MAX + 1] = {
 	"unspecified",
 	"IBSS",
 	"managed",
 	"AP",
 	"AP/VLAN",
 	"WDS",
 	"monitor",
 	"mesh point"
 };

 static char modebuf[100];

 const char *iftype_name(enum nl80211_iftype iftype)
 {
 	if (iftype <= NL80211_IFTYPE_MAX)
 		return ifmodes[iftype];
 	sprintf(modebuf, "Unknown mode (%d)", iftype);
 	return modebuf;
 }

 static const char *commands[NL80211_CMD_MAX + 1] = {
 	[NL80211_CMD_GET_WIPHY] = "get_wiphy",
 	[NL80211_CMD_SET_WIPHY] = "set_wiphy",
 	[NL80211_CMD_NEW_WIPHY] = "new_wiphy",
 	[NL80211_CMD_DEL_WIPHY] = "del_wiphy",
 	[NL80211_CMD_GET_INTERFACE] = "get_interface",
 	[NL80211_CMD_SET_INTERFACE] = "set_interface",
 	[NL80211_CMD_NEW_INTERFACE] = "new_interface",
 	[NL80211_CMD_DEL_INTERFACE] = "del_interface",
 	[NL80211_CMD_GET_KEY] = "get_key",
 	[NL80211_CMD_SET_KEY] = "set_key",
 	[NL80211_CMD_NEW_KEY] = "new_key",
 	[NL80211_CMD_DEL_KEY] = "del_key",
 	[NL80211_CMD_GET_BEACON] = "get_beacon",
 	[NL80211_CMD_SET_BEACON] = "set_beacon",
 	[NL80211_CMD_NEW_BEACON] = "new_beacon",
 	[NL80211_CMD_DEL_BEACON] = "del_beacon",
 	[NL80211_CMD_GET_STATION] = "get_station",
 	[NL80211_CMD_SET_STATION] = "set_station",
 	[NL80211_CMD_NEW_STATION] = "new_station",
 	[NL80211_CMD_DEL_STATION] = "del_station",
 	[NL80211_CMD_GET_MPATH] = "get_mpath",
 	[NL80211_CMD_SET_MPATH] = "set_mpath",
 	[NL80211_CMD_NEW_MPATH] = "new_mpath",
 	[NL80211_CMD_DEL_MPATH] = "del_mpath",
 	[NL80211_CMD_SET_BSS] = "set_bss",
 	[NL80211_CMD_SET_REG] = "set_reg",
 	[NL80211_CMD_REQ_SET_REG] = "reg_set_reg",
 	[NL80211_CMD_GET_MESH_PARAMS] = "get_mesh_params",
 	[NL80211_CMD_SET_MESH_PARAMS] = "set_mesh_params",
 	[NL80211_CMD_SET_MGMT_EXTRA_IE] = "set_mgmt_extra_ie",
 	[NL80211_CMD_GET_REG] = "get_reg",
 	[NL80211_CMD_GET_SCAN] = "get_scan",
 	[NL80211_CMD_TRIGGER_SCAN] = "trigger_scan",
 	[NL80211_CMD_NEW_SCAN_RESULTS] = "new_scan_results",
 	[NL80211_CMD_SCAN_ABORTED] = "scan_aborted",
 	[NL80211_CMD_REG_CHANGE] = "reg_change",
 	[NL80211_CMD_AUTHENTICATE] = "authenticate",
 	[NL80211_CMD_ASSOCIATE] = "associate",
 	[NL80211_CMD_DEAUTHENTICATE] = "deauthenticate",
 	[NL80211_CMD_DISASSOCIATE] = "disassociate",
 	[NL80211_CMD_MICHAEL_MIC_FAILURE] = "michael_mic_failure",
 	[NL80211_CMD_REG_BEACON_HINT] = "reg_beacon_hint",
 	[NL80211_CMD_JOIN_IBSS] = "join_ibss",
 	[NL80211_CMD_LEAVE_IBSS] = "leave_ibss",
 	[NL80211_CMD_TESTMODE] = "testmode",
 	[NL80211_CMD_CONNECT] = "connect",
 	[NL80211_CMD_ROAM] = "roam",
 	[NL80211_CMD_DISCONNECT] = "disconnect",
 	[NL80211_CMD_SET_WIPHY_NETNS] = "set_wiphy_netns",
 	[NL80211_CMD_GET_SURVEY] = "get_survey",
 	[NL80211_CMD_SET_PMKSA] = "set_pmksa",
 	[NL80211_CMD_DEL_PMKSA] = "del_pmksa",
 	[NL80211_CMD_FLUSH_PMKSA] = "flush_pmksa",
 	[NL80211_CMD_REMAIN_ON_CHANNEL] = "remain_on_channel",
 	[NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL] = "cancel_remain_on_channel",
 	[NL80211_CMD_SET_TX_BITRATE_MASK] = "set_tx_bitrate_mask",
 	[NL80211_CMD_REGISTER_ACTION] = "register_action",
 	[NL80211_CMD_ACTION] = "action",
 };

 static char cmdbuf[100];

 const char *command_name(enum nl80211_commands cmd)
 {
 	if (cmd <= NL80211_CMD_MAX && commands[cmd])
 		return commands[cmd];
 	sprintf(cmdbuf, "Unknown command (%d)", cmd);
 	return cmdbuf;
 }

 int ieee80211_channel_to_frequency(int chan)
 {
 	if (chan < 14)
 		return 2407 + chan * 5;

 	if (chan == 14)
 		return 2484;

 	/* FIXME: dot11ChannelStartingFactor (802.11-2007 17.3.8.3.2) */
 	return (chan + 1000) * 5;
 }

 int ieee80211_frequency_to_channel(int freq)
 {
 	if (freq == 2484)
 		return 14;

 	if (freq < 2484)
 		return (freq - 2407) / 5;

 	/* FIXME: dot11ChannelStartingFactor (802.11-2007 17.3.8.3.2) */
 	return freq/5 - 1000;
 }

 void print_ssid_escaped(const uint8_t len, const uint8_t *data)
 {
 	int i;

 	for (i = 0; i < len; i++) {
 		if (isprint(data[i]))
 			printf("%c", data[i]);
 		else
 			printf("\\x%.2x", data[i]);
 	}
 }

 static int hex2num(char digit)
 {
 	if (!isxdigit(digit))
 		return -1;
 	if (isdigit(digit))
 		return digit - '0';
 	return tolower(digit) - 'a' + 10;
 }

 static int hex2byte(char *hex)
 {
 	int d1, d2;

 	d1 = hex2num(hex[0]);
 	if (d1 < 0)
 		return -1;
 	d2 = hex2num(hex[1]);
 	if (d2 < 0)
 		return -1;
 	return (d1 << 4) | d2;
 }

 static char *hex2bin(char *hex, char *buf)
 {
 	char *result = buf;
 	int d;

 	while (hex[0]) {
 		d = hex2byte(hex);
 		if (d < 0)
 			return NULL;
 		buf[0] = d;
 		buf++;
 		hex += 2;
 	}

 	return result;
 }

 int parse_keys(struct nl_msg *msg, char **argv, int argc)
 {
 	struct nlattr *keys;
 	int i = 0;
 	bool have_default = false;
 	char keybuf[13];

 	if (!argc)
 		return 1;

 	NLA_PUT_FLAG(msg, NL80211_ATTR_PRIVACY);

 	keys = nla_nest_start(msg, NL80211_ATTR_KEYS);
 	if (!keys)
 		return -ENOBUFS;

 	do {
 		char *arg = *argv;
 		int pos = 0, keylen;
 		struct nlattr *key = nla_nest_start(msg, ++i);
 		char *keydata;

 		if (!key)
 			return -ENOBUFS;

 		if (arg[pos] == 'd') {
 			NLA_PUT_FLAG(msg, NL80211_KEY_DEFAULT);
 			pos++;
 			if (arg[pos] == ':')
 				pos++;
 			have_default = true;
 		}

 		if (!isdigit(arg[pos]))
 			goto explain;
 		NLA_PUT_U8(msg, NL80211_KEY_IDX, arg[pos++] - '0');
 		if (arg[pos++] != ':')
 			goto explain;
 		keydata = arg + pos;
 		switch (strlen(keydata)) {
 		case 10:
 			keydata = hex2bin(keydata, keybuf);
 		case 5:
 			NLA_PUT_U32(msg, NL80211_KEY_CIPHER, 0x000FAC01);
 			keylen = 5;
 			break;
 		case 26:
 			keydata = hex2bin(keydata, keybuf);
 		case 13:
 			NLA_PUT_U32(msg, NL80211_KEY_CIPHER, 0x000FAC05);
 			keylen = 13;
 			break;
 		default:
 			goto explain;
 		}

 		if (!keydata)
 			goto explain;

 		NLA_PUT(msg, NL80211_KEY_DATA, keylen, keydata);

 		argv++;
 		argc--;

 		/* one key should be TX key */
 		if (!have_default && !argc)
 			NLA_PUT_FLAG(msg, NL80211_KEY_DEFAULT);

 		nla_nest_end(msg, key);
 	} while (argc);

 	nla_nest_end(msg, keys);

 	return 0;
  nla_put_failure:
 	return -ENOBUFS;
  explain:
 	fprintf(stderr, "key must be [d:]index:data where\n"
 			"  'd:'     means default (transmit) key\n"
 			"  'index:' is a single digit (0-3)\n"
 			"  'data'   must be 5 or 13 ascii chars\n"
 			"           or 10 or 26 hex digits\n"
 			"for example: d:2:6162636465 is the same as d:2:abcde\n");
 	return 2;
 }

 static void print_mcs_index(const __u8 *mcs)
 {
 	unsigned int mcs_bit, prev_bit = -2, prev_cont = 0;

 	for (mcs_bit = 0; mcs_bit <= 76; mcs_bit++) {
 		unsigned int mcs_octet = mcs_bit/8;
 		unsigned int MCS_RATE_BIT = 1 << mcs_bit % 8;
 		bool mcs_rate_idx_set;

 		mcs_rate_idx_set = !!(mcs[mcs_octet] & MCS_RATE_BIT);

 		if (!mcs_rate_idx_set)
 			continue;

 		if (prev_bit != mcs_bit - 1) {
 			if (prev_bit != -2)
 				printf("%d, ", prev_bit);
 			else
 				printf(" ");
 			printf("%d", mcs_bit);
 			prev_cont = 0;
 		} else if (!prev_cont) {
 			printf("-");
 			prev_cont = 1;
 		}

 		prev_bit = mcs_bit;
 	}

 	if (prev_cont)
 		printf("%d", prev_bit);
 	printf("\n");
 }

 /*
  * There are only 4 possible values, we just use a case instead of computing it,
  * but technically this can also be computed through the formula:
  *
  * Max AMPDU length = (2 ^ (13 + exponent)) - 1 bytes
  */
 static __u32 compute_ampdu_length(__u8 exponent)
 {
 	switch (exponent) {
 	case 0: return 8191;  /* (2 ^(13 + 0)) -1 */
 	case 1: return 16383; /* (2 ^(13 + 1)) -1 */
 	case 2: return 32767; /* (2 ^(13 + 2)) -1 */
 	case 3: return 65535; /* (2 ^(13 + 3)) -1 */
 	default: return 0;
 	}
 }

 static const char *print_ampdu_space(__u8 space)
 {
 	switch (space) {
 	case 0: return "No restriction";
 	case 1: return "1/4 usec";
 	case 2: return "1/2 usec";
 	case 3: return "1 usec";
 	case 4: return "2 usec";
 	case 5: return "4 usec";
 	case 6: return "8 usec";
 	case 7: return "16 usec";
 	default:
 		return "BUG (spacing more than 3 bits!)";
 	}
 }

 void print_ampdu_length(__u8 exponent)
 {
 	__u32 max_ampdu_length;

 	max_ampdu_length = compute_ampdu_length(exponent);

 	if (max_ampdu_length) {
 		printf("\t\tMaximum RX AMPDU length %d bytes (exponent: 0x0%02x)\n",
 		       max_ampdu_length, exponent);
         } else {
 		printf("\t\tMaximum RX AMPDU length: unrecognized bytes "
 		       "(exponent: %d)\n", exponent);
 	}
 }

 void print_ampdu_spacing(__u8 spacing)
 {
         printf("\t\tMinimum RX AMPDU time spacing: %s (0x%02x)\n",
                print_ampdu_space(spacing), spacing);
 }

 void print_ht_capability(__u16 cap)
 {
 #define PRINT_HT_CAP(_cond, _str) \
 	do { \
 		if (_cond) \
 			printf("\t\t\t" _str "\n"); \
 	} while (0)

 	printf("\t\tCapabilities: 0x%02x\n", cap);

 	PRINT_HT_CAP((cap & BIT(0)), "RX LDPC");
 	PRINT_HT_CAP((cap & BIT(1)), "HT20/HT40");
 	PRINT_HT_CAP(!(cap & BIT(1)), "HT20");

 	PRINT_HT_CAP(((cap >> 2) & 0x3) == 0, "Static SM Power Save");
 	PRINT_HT_CAP(((cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
 	PRINT_HT_CAP(((cap >> 2) & 0x3) == 3, "SM Power Save disabled");

 	PRINT_HT_CAP((cap & BIT(4)), "RX Greenfield");
 	PRINT_HT_CAP((cap & BIT(5)), "RX HT20 SGI");
 	PRINT_HT_CAP((cap & BIT(6)), "RX HT40 SGI");
 	PRINT_HT_CAP((cap & BIT(7)), "TX STBC");

 	PRINT_HT_CAP(((cap >> 8) & 0x3) == 0, "No RX STBC");
 	PRINT_HT_CAP(((cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
 	PRINT_HT_CAP(((cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
 	PRINT_HT_CAP(((cap >> 8) & 0x3) == 3, "RX STBC 3-streams");

 	PRINT_HT_CAP((cap & BIT(10)), "HT Delayed Block Ack");

 	PRINT_HT_CAP((cap & BIT(11)), "Max AMSDU length: 3839 bytes");
         PRINT_HT_CAP(!(cap & BIT(11)), "Max AMSDU length: 7935 bytes");

 	/*
 	 * For beacons and probe response this would mean the BSS
 	 * does or does not allow the usage of DSSS/CCK HT40.
 	 * Otherwise it means the STA does or does not use
 	 * DSSS/CCK HT40.
 	 */
 	PRINT_HT_CAP((cap & BIT(12)), "DSSS/CCK HT40");
 	PRINT_HT_CAP(!(cap & BIT(12)), "No DSSS/CCK HT40");

 	/* BIT(13) is reserved */

 	PRINT_HT_CAP((cap & BIT(14)), "40 MHz Intolerant");

 	PRINT_HT_CAP((cap & BIT(15)), "L-SIG TXOP protection");
 #undef PRINT_HT_CAP
 }

 void print_ht_mcs(const __u8 *mcs)
 {
 	/* As defined in 7.3.2.57.4 Supported MCS Set field */
 	unsigned int tx_max_num_spatial_streams, max_rx_supp_data_rate;
 	bool tx_mcs_set_defined, tx_mcs_set_equal, tx_unequal_modulation;

 	max_rx_supp_data_rate = ((mcs[10] >> 8) & ((mcs[11] & 0x3) << 8));
 	tx_mcs_set_defined = !!(mcs[12] & (1 << 0));
 	tx_mcs_set_equal = !(mcs[12] & (1 << 1));
 	tx_max_num_spatial_streams = ((mcs[12] >> 2) & 3) + 1;
 	tx_unequal_modulation = !!(mcs[12] & (1 << 4));

 	if (max_rx_supp_data_rate)
 		printf("\t\tHT Max RX data rate: %d Mbps\n", max_rx_supp_data_rate);
 	/* XXX: else see 9.6.0e.5.3 how to get this I think */

 	if (tx_mcs_set_defined) {
 		if (tx_mcs_set_equal) {
 			printf("\t\tHT TX/RX MCS rate indexes supported:");
 			print_mcs_index(mcs);
 		} else {
 			printf("\t\tHT RX MCS rate indexes supported:");
 			print_mcs_index(mcs);

 			if (tx_unequal_modulation)
 				printf("\t\tTX unequal modulation supported\n");
 			else
 				printf("\t\tTX unequal modulation not supported\n");

 			printf("\t\tHT TX Max spatial streams: %d\n",
 				tx_max_num_spatial_streams);

 			printf("\t\tHT TX MCS rate indexes supported may differ\n");
 		}
 	} else {
 		printf("\t\tHT RX MCS rate indexes supported:");
 		print_mcs_index(mcs);
 		printf("\t\tHT TX MCS rate indexes are undefined\n");
 	}
 }
	#include <ctype.h>
	#include <netlink/attr.h>
	#include <errno.h>
	#include <stdbool.h>
	#include "iw.h"
	#include "nl80211.h"

	void mac_addr_n2a(char mac_addr, unsigned char arg)
	{
	int i, l;

	l = 0;
	for (i = 0; i < ETH_ALEN ; i++) {
	if (i == 0) {
	sprintf(mac_addr+l, "%02x", arg[i]);
	l += 2;
	} else {
	sprintf(mac_addr+l, ":%02x", arg[i]);
	l += 3;
	}
	}
	}

	int mac_addr_a2n(unsigned char mac_addr, char arg)
	{
	int i;

	for (i = 0; i < ETH_ALEN ; i++) {
	int temp;
	char *cp = strchr(arg, ':');
	if (cp) {
	*cp = 0;
	cp++;
	}
	if (sscanf(arg, "%x", &temp) != 1)
	return -1;
	if (temp < 0 \|\| temp > 255)
	return -1;

	mac_addr[i] = temp;
	if (!cp)
	break;
	arg = cp;
	}
	if (i < ETH_ALEN - 1)
	return -1;

	return 0;
	}

	unsigned char parse_hex(char hex, size_t *outlen)
	{
	size_t len = strlen(hex);
	unsigned char *result = calloc(len/2 + 2, 1);
	int pos = 0;

	if (!result)
	return NULL;

	*outlen = 0;

	while (1) {
	int temp;
	char *cp = strchr(hex, ':');
	if (cp) {
	*cp = 0;
	cp++;
	}
	if (sscanf(hex, "%x", &temp) != 1)
	goto error;
	if (temp < 0 \|\| temp > 255)
	goto error;

	(*outlen)++;

	result[pos++] = temp;
	if (!cp)
	break;
	hex = cp;
	}

	return result;
	error:
	free(result);
	return NULL;
	}

	static const char *ifmodes[NL80211_IFTYPE_MAX + 1] = {
	"unspecified",
	"IBSS",
	"managed",
	"AP",
	"AP/VLAN",
	"WDS",
	"monitor",
	"mesh point"
	};

	static char modebuf[100];

	const char *iftype_name(enum nl80211_iftype iftype)
	{
	if (iftype <= NL80211_IFTYPE_MAX)
	return ifmodes[iftype];
	sprintf(modebuf, "Unknown mode (%d)", iftype);
	return modebuf;
	}

	static const char *commands[NL80211_CMD_MAX + 1] = {
	[NL80211_CMD_GET_WIPHY] = "get_wiphy",
	[NL80211_CMD_SET_WIPHY] = "set_wiphy",
	[NL80211_CMD_NEW_WIPHY] = "new_wiphy",
	[NL80211_CMD_DEL_WIPHY] = "del_wiphy",
	[NL80211_CMD_GET_INTERFACE] = "get_interface",
	[NL80211_CMD_SET_INTERFACE] = "set_interface",
	[NL80211_CMD_NEW_INTERFACE] = "new_interface",
	[NL80211_CMD_DEL_INTERFACE] = "del_interface",
	[NL80211_CMD_GET_KEY] = "get_key",
	[NL80211_CMD_SET_KEY] = "set_key",
	[NL80211_CMD_NEW_KEY] = "new_key",
	[NL80211_CMD_DEL_KEY] = "del_key",
	[NL80211_CMD_GET_BEACON] = "get_beacon",
	[NL80211_CMD_SET_BEACON] = "set_beacon",
	[NL80211_CMD_NEW_BEACON] = "new_beacon",
	[NL80211_CMD_DEL_BEACON] = "del_beacon",
	[NL80211_CMD_GET_STATION] = "get_station",
	[NL80211_CMD_SET_STATION] = "set_station",
	[NL80211_CMD_NEW_STATION] = "new_station",
	[NL80211_CMD_DEL_STATION] = "del_station",
	[NL80211_CMD_GET_MPATH] = "get_mpath",
	[NL80211_CMD_SET_MPATH] = "set_mpath",
	[NL80211_CMD_NEW_MPATH] = "new_mpath",
	[NL80211_CMD_DEL_MPATH] = "del_mpath",
	[NL80211_CMD_SET_BSS] = "set_bss",
	[NL80211_CMD_SET_REG] = "set_reg",
	[NL80211_CMD_REQ_SET_REG] = "reg_set_reg",
	[NL80211_CMD_GET_MESH_PARAMS] = "get_mesh_params",
	[NL80211_CMD_SET_MESH_PARAMS] = "set_mesh_params",
	[NL80211_CMD_SET_MGMT_EXTRA_IE] = "set_mgmt_extra_ie",
	[NL80211_CMD_GET_REG] = "get_reg",
	[NL80211_CMD_GET_SCAN] = "get_scan",
	[NL80211_CMD_TRIGGER_SCAN] = "trigger_scan",
	[NL80211_CMD_NEW_SCAN_RESULTS] = "new_scan_results",
	[NL80211_CMD_SCAN_ABORTED] = "scan_aborted",
	[NL80211_CMD_REG_CHANGE] = "reg_change",
	[NL80211_CMD_AUTHENTICATE] = "authenticate",
	[NL80211_CMD_ASSOCIATE] = "associate",
	[NL80211_CMD_DEAUTHENTICATE] = "deauthenticate",
	[NL80211_CMD_DISASSOCIATE] = "disassociate",
	[NL80211_CMD_MICHAEL_MIC_FAILURE] = "michael_mic_failure",
	[NL80211_CMD_REG_BEACON_HINT] = "reg_beacon_hint",
	[NL80211_CMD_JOIN_IBSS] = "join_ibss",
	[NL80211_CMD_LEAVE_IBSS] = "leave_ibss",
	[NL80211_CMD_TESTMODE] = "testmode",
	[NL80211_CMD_CONNECT] = "connect",
	[NL80211_CMD_ROAM] = "roam",
	[NL80211_CMD_DISCONNECT] = "disconnect",
	[NL80211_CMD_SET_WIPHY_NETNS] = "set_wiphy_netns",
	[NL80211_CMD_GET_SURVEY] = "get_survey",
	[NL80211_CMD_SET_PMKSA] = "set_pmksa",
	[NL80211_CMD_DEL_PMKSA] = "del_pmksa",
	[NL80211_CMD_FLUSH_PMKSA] = "flush_pmksa",
	[NL80211_CMD_REMAIN_ON_CHANNEL] = "remain_on_channel",
	[NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL] = "cancel_remain_on_channel",
	[NL80211_CMD_SET_TX_BITRATE_MASK] = "set_tx_bitrate_mask",
	[NL80211_CMD_REGISTER_ACTION] = "register_action",
	[NL80211_CMD_ACTION] = "action",
	};

	static char cmdbuf[100];

	const char *command_name(enum nl80211_commands cmd)
	{
	if (cmd <= NL80211_CMD_MAX && commands[cmd])
	return commands[cmd];
	sprintf(cmdbuf, "Unknown command (%d)", cmd);
	return cmdbuf;
	}

	int ieee80211_channel_to_frequency(int chan)
	{
	if (chan < 14)
	return 2407 + chan * 5;

	if (chan == 14)
	return 2484;

	/* FIXME: dot11ChannelStartingFactor (802.11-2007 17.3.8.3.2) */
	return (chan + 1000) * 5;
	}

	int ieee80211_frequency_to_channel(int freq)
	{
	if (freq == 2484)
	return 14;

	if (freq < 2484)
	return (freq - 2407) / 5;

	/* FIXME: dot11ChannelStartingFactor (802.11-2007 17.3.8.3.2) */
	return freq/5 - 1000;
	}

	void print_ssid_escaped(const uint8_t len, const uint8_t *data)
	{
	int i;

	for (i = 0; i < len; i++) {
	if (isprint(data[i]))
	printf("%c", data[i]);
	else
	printf("\\x%.2x", data[i]);
	}
	}

	static int hex2num(char digit)
	{
	if (!isxdigit(digit))
	return -1;
	if (isdigit(digit))
	return digit - '0';
	return tolower(digit) - 'a' + 10;
	}

	static int hex2byte(char *hex)
	{
	int d1, d2;

	d1 = hex2num(hex[0]);
	if (d1 < 0)
	return -1;
	d2 = hex2num(hex[1]);
	if (d2 < 0)
	return -1;
	return (d1 << 4) \| d2;
	}

	static char hex2bin(char hex, char *buf)
	{
	char *result = buf;
	int d;

	while (hex[0]) {
	d = hex2byte(hex);
	if (d < 0)
	return NULL;
	buf[0] = d;
	buf++;
	hex += 2;
	}

	return result;
	}

	int parse_keys(struct nl_msg msg, char *argv, int argc)
	{
	struct nlattr *keys;
	int i = 0;
	bool have_default = false;
	char keybuf[13];

	if (!argc)
	return 1;

	NLA_PUT_FLAG(msg, NL80211_ATTR_PRIVACY);

	keys = nla_nest_start(msg, NL80211_ATTR_KEYS);
	if (!keys)
	return -ENOBUFS;

	do {
	char arg = argv;
	int pos = 0, keylen;
	struct nlattr *key = nla_nest_start(msg, ++i);
	char *keydata;

	if (!key)
	return -ENOBUFS;

	if (arg[pos] == 'd') {
	NLA_PUT_FLAG(msg, NL80211_KEY_DEFAULT);
	pos++;
	if (arg[pos] == ':')
	pos++;
	have_default = true;
	}

	if (!isdigit(arg[pos]))
	goto explain;
	NLA_PUT_U8(msg, NL80211_KEY_IDX, arg[pos++] - '0');
	if (arg[pos++] != ':')
	goto explain;
	keydata = arg + pos;
	switch (strlen(keydata)) {
	case 10:
	keydata = hex2bin(keydata, keybuf);
	case 5:
	NLA_PUT_U32(msg, NL80211_KEY_CIPHER, 0x000FAC01);
	keylen = 5;
	break;
	case 26:
	keydata = hex2bin(keydata, keybuf);
	case 13:
	NLA_PUT_U32(msg, NL80211_KEY_CIPHER, 0x000FAC05);
	keylen = 13;
	break;
	default:
	goto explain;
	}

	if (!keydata)
	goto explain;

	NLA_PUT(msg, NL80211_KEY_DATA, keylen, keydata);

	argv++;
	argc--;

	/* one key should be TX key */
	if (!have_default && !argc)
	NLA_PUT_FLAG(msg, NL80211_KEY_DEFAULT);

	nla_nest_end(msg, key);
	} while (argc);

	nla_nest_end(msg, keys);

	return 0;
	nla_put_failure:
	return -ENOBUFS;
	explain:
	fprintf(stderr, "key must be [d:]index:data where\n"
	" 'd:' means default (transmit) key\n"
	" 'index:' is a single digit (0-3)\n"
	" 'data' must be 5 or 13 ascii chars\n"
	" or 10 or 26 hex digits\n"
	"for example: d:2:6162636465 is the same as d:2:abcde\n");
	return 2;
	}

	static void print_mcs_index(const __u8 *mcs)
	{
	unsigned int mcs_bit, prev_bit = -2, prev_cont = 0;

	for (mcs_bit = 0; mcs_bit <= 76; mcs_bit++) {
	unsigned int mcs_octet = mcs_bit/8;
	unsigned int MCS_RATE_BIT = 1 << mcs_bit % 8;
	bool mcs_rate_idx_set;

	mcs_rate_idx_set = !!(mcs[mcs_octet] & MCS_RATE_BIT);

	if (!mcs_rate_idx_set)
	continue;

	if (prev_bit != mcs_bit - 1) {
	if (prev_bit != -2)
	printf("%d, ", prev_bit);
	else
	printf(" ");
	printf("%d", mcs_bit);
	prev_cont = 0;
	} else if (!prev_cont) {
	printf("-");
	prev_cont = 1;
	}

	prev_bit = mcs_bit;
	}

	if (prev_cont)
	printf("%d", prev_bit);
	printf("\n");
	}

	/*
	* There are only 4 possible values, we just use a case instead of computing it,
	* but technically this can also be computed through the formula:
	*
	* Max AMPDU length = (2 ^ (13 + exponent)) - 1 bytes
	*/
	static __u32 compute_ampdu_length(__u8 exponent)
	{
	switch (exponent) {
	case 0: return 8191; /* (2 ^(13 + 0)) -1 */
	case 1: return 16383; /* (2 ^(13 + 1)) -1 */
	case 2: return 32767; /* (2 ^(13 + 2)) -1 */
	case 3: return 65535; /* (2 ^(13 + 3)) -1 */
	default: return 0;
	}
	}

	static const char *print_ampdu_space(__u8 space)
	{
	switch (space) {
	case 0: return "No restriction";
	case 1: return "1/4 usec";
	case 2: return "1/2 usec";
	case 3: return "1 usec";
	case 4: return "2 usec";
	case 5: return "4 usec";
	case 6: return "8 usec";
	case 7: return "16 usec";
	default:
	return "BUG (spacing more than 3 bits!)";
	}
	}

	void print_ampdu_length(__u8 exponent)
	{
	__u32 max_ampdu_length;

	max_ampdu_length = compute_ampdu_length(exponent);

	if (max_ampdu_length) {
	printf("\t\tMaximum RX AMPDU length %d bytes (exponent: 0x0%02x)\n",
	max_ampdu_length, exponent);
	} else {
	printf("\t\tMaximum RX AMPDU length: unrecognized bytes "
	"(exponent: %d)\n", exponent);
	}
	}

	void print_ampdu_spacing(__u8 spacing)
	{
	printf("\t\tMinimum RX AMPDU time spacing: %s (0x%02x)\n",
	print_ampdu_space(spacing), spacing);
	}

	void print_ht_capability(__u16 cap)
	{
	#define PRINT_HT_CAP(_cond, _str) \
	do { \
	if (_cond) \
	printf("\t\t\t" _str "\n"); \
	} while (0)

	printf("\t\tCapabilities: 0x%02x\n", cap);

	PRINT_HT_CAP((cap & BIT(0)), "RX LDPC");
	PRINT_HT_CAP((cap & BIT(1)), "HT20/HT40");
	PRINT_HT_CAP(!(cap & BIT(1)), "HT20");

	PRINT_HT_CAP(((cap >> 2) & 0x3) == 0, "Static SM Power Save");
	PRINT_HT_CAP(((cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
	PRINT_HT_CAP(((cap >> 2) & 0x3) == 3, "SM Power Save disabled");

	PRINT_HT_CAP((cap & BIT(4)), "RX Greenfield");
	PRINT_HT_CAP((cap & BIT(5)), "RX HT20 SGI");
	PRINT_HT_CAP((cap & BIT(6)), "RX HT40 SGI");
	PRINT_HT_CAP((cap & BIT(7)), "TX STBC");

	PRINT_HT_CAP(((cap >> 8) & 0x3) == 0, "No RX STBC");
	PRINT_HT_CAP(((cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
	PRINT_HT_CAP(((cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
	PRINT_HT_CAP(((cap >> 8) & 0x3) == 3, "RX STBC 3-streams");

	PRINT_HT_CAP((cap & BIT(10)), "HT Delayed Block Ack");

	PRINT_HT_CAP((cap & BIT(11)), "Max AMSDU length: 3839 bytes");
	PRINT_HT_CAP(!(cap & BIT(11)), "Max AMSDU length: 7935 bytes");

	/*
	* For beacons and probe response this would mean the BSS
	* does or does not allow the usage of DSSS/CCK HT40.
	* Otherwise it means the STA does or does not use
	* DSSS/CCK HT40.
	*/
	PRINT_HT_CAP((cap & BIT(12)), "DSSS/CCK HT40");
	PRINT_HT_CAP(!(cap & BIT(12)), "No DSSS/CCK HT40");

	/* BIT(13) is reserved */

	PRINT_HT_CAP((cap & BIT(14)), "40 MHz Intolerant");

	PRINT_HT_CAP((cap & BIT(15)), "L-SIG TXOP protection");
	#undef PRINT_HT_CAP
	}

	void print_ht_mcs(const __u8 *mcs)
	{
	/* As defined in 7.3.2.57.4 Supported MCS Set field */
	unsigned int tx_max_num_spatial_streams, max_rx_supp_data_rate;
	bool tx_mcs_set_defined, tx_mcs_set_equal, tx_unequal_modulation;

	max_rx_supp_data_rate = ((mcs[10] >> 8) & ((mcs[11] & 0x3) << 8));
	tx_mcs_set_defined = !!(mcs[12] & (1 << 0));
	tx_mcs_set_equal = !(mcs[12] & (1 << 1));
	tx_max_num_spatial_streams = ((mcs[12] >> 2) & 3) + 1;
	tx_unequal_modulation = !!(mcs[12] & (1 << 4));

	if (max_rx_supp_data_rate)
	printf("\t\tHT Max RX data rate: %d Mbps\n", max_rx_supp_data_rate);
	/* XXX: else see 9.6.0e.5.3 how to get this I think */

	if (tx_mcs_set_defined) {
	if (tx_mcs_set_equal) {
	printf("\t\tHT TX/RX MCS rate indexes supported:");
	print_mcs_index(mcs);
	} else {
	printf("\t\tHT RX MCS rate indexes supported:");
	print_mcs_index(mcs);

	if (tx_unequal_modulation)
	printf("\t\tTX unequal modulation supported\n");
	else
	printf("\t\tTX unequal modulation not supported\n");

	printf("\t\tHT TX Max spatial streams: %d\n",
	tx_max_num_spatial_streams);

	printf("\t\tHT TX MCS rate indexes supported may differ\n");
	}
	} else {
	printf("\t\tHT RX MCS rate indexes supported:");
	print_mcs_index(mcs);
	printf("\t\tHT TX MCS rate indexes are undefined\n");
	}
	}