[thirdparty/iw.git] / scan.c

#include <net/if.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <stdbool.h>

#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <netlink/msg.h>
#include <netlink/attr.h>

#include "nl80211.h"
#include "iw.h"

#define WLAN_CAPABILITY_ESS		(1<<0)
#define WLAN_CAPABILITY_IBSS		(1<<1)
#define WLAN_CAPABILITY_CF_POLLABLE	(1<<2)
#define WLAN_CAPABILITY_CF_POLL_REQUEST	(1<<3)
#define WLAN_CAPABILITY_PRIVACY		(1<<4)
#define WLAN_CAPABILITY_SHORT_PREAMBLE	(1<<5)
#define WLAN_CAPABILITY_PBCC		(1<<6)
#define WLAN_CAPABILITY_CHANNEL_AGILITY	(1<<7)
#define WLAN_CAPABILITY_SPECTRUM_MGMT	(1<<8)
#define WLAN_CAPABILITY_QOS		(1<<9)
#define WLAN_CAPABILITY_SHORT_SLOT_TIME	(1<<10)
#define WLAN_CAPABILITY_APSD		(1<<11)
#define WLAN_CAPABILITY_RADIO_MEASURE	(1<<12)
#define WLAN_CAPABILITY_DSSS_OFDM	(1<<13)
#define WLAN_CAPABILITY_DEL_BACK	(1<<14)
#define WLAN_CAPABILITY_IMM_BACK	(1<<15)
/* DMG (60gHz) 802.11ad */
/* type - bits 0..1 */
#define WLAN_CAPABILITY_DMG_TYPE_MASK		(3<<0)

#define WLAN_CAPABILITY_DMG_TYPE_IBSS		(1<<0) /* Tx by: STA */
#define WLAN_CAPABILITY_DMG_TYPE_PBSS		(2<<0) /* Tx by: PCP */
#define WLAN_CAPABILITY_DMG_TYPE_AP		(3<<0) /* Tx by: AP */

#define WLAN_CAPABILITY_DMG_CBAP_ONLY		(1<<2)
#define WLAN_CAPABILITY_DMG_CBAP_SOURCE		(1<<3)
#define WLAN_CAPABILITY_DMG_PRIVACY		(1<<4)
#define WLAN_CAPABILITY_DMG_ECPAC		(1<<5)

#define WLAN_CAPABILITY_DMG_SPECTRUM_MGMT	(1<<8)
#define WLAN_CAPABILITY_DMG_RADIO_MEASURE	(1<<12)

static unsigned char ms_oui[3]		= { 0x00, 0x50, 0xf2 };
static unsigned char ieee80211_oui[3]	= { 0x00, 0x0f, 0xac };
static unsigned char wfa_oui[3]		= { 0x50, 0x6f, 0x9a };

struct scan_params {
	bool unknown;
	enum print_ie_type type;
	bool show_both_ie_sets;
};

#define IEEE80211_COUNTRY_EXTENSION_ID 201

union ieee80211_country_ie_triplet {
	struct {
		__u8 first_channel;
		__u8 num_channels;
		__s8 max_power;
	} __attribute__ ((packed)) chans;
	struct {
		__u8 reg_extension_id;
		__u8 reg_class;
		__u8 coverage_class;
	} __attribute__ ((packed)) ext;
} __attribute__ ((packed));

static int parse_random_mac_addr(struct nl_msg *msg, char *arg)
{
	char *a_addr, *a_mask, *sep;
	unsigned char addr[ETH_ALEN], mask[ETH_ALEN];
	char *addrs = arg + 9;

	if (*addrs != '=')
		return 0;

	addrs++;
	sep = strchr(addrs, '/');
	a_addr = addrs;

	if (!sep)
		return 1;

	*sep = 0;
	a_mask = sep + 1;
	if (mac_addr_a2n(addr, a_addr) || mac_addr_a2n(mask, a_mask))
		return 1;

	NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
	NLA_PUT(msg, NL80211_ATTR_MAC_MASK, ETH_ALEN, mask);

	return 0;
 nla_put_failure:
	return -ENOBUFS;
}

int parse_sched_scan(struct nl_msg *msg, int *argc, char ***argv)
{
	struct nl_msg *matchset = NULL, *freqs = NULL, *ssids = NULL;
	struct nlattr *match = NULL;
	enum {
		ND_TOPLEVEL,
		ND_MATCH,
		ND_FREQS,
		ND_ACTIVE,
	} parse_state = ND_TOPLEVEL;
	int c  = *argc;
	char *end, **v = *argv;
	int err = 0, i = 0;
	unsigned int freq, interval = 0, delay = 0;
	bool have_matchset = false, have_freqs = false, have_ssids = false;
	bool have_active = false, have_passive = false;
	uint32_t flags = 0;

	matchset = nlmsg_alloc();
	if (!matchset) {
		err = -ENOBUFS;
		goto out;
	}

	freqs = nlmsg_alloc();
	if (!freqs) {
		err = -ENOBUFS;
		goto out;
	}

	ssids = nlmsg_alloc();
	if (!ssids) {
		err = -ENOMEM;
		goto out;
	}

	while (c) {
		switch (parse_state) {
		case ND_TOPLEVEL:
			if (!strcmp(v[0], "interval")) {
				c--; v++;
				if (c == 0) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				if (interval) {
					err = -EINVAL;
					goto nla_put_failure;
				}
				interval = strtoul(v[0], &end, 10);
				if (*end || !interval) {
					err = -EINVAL;
					goto nla_put_failure;
				}
				NLA_PUT_U32(msg,
					    NL80211_ATTR_SCHED_SCAN_INTERVAL,
					    interval);
			} else if (!strcmp(v[0], "delay")) {
				c--; v++;
				if (c == 0) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				if (delay) {
					err = -EINVAL;
					goto nla_put_failure;
				}
				delay = strtoul(v[0], &end, 10);
				if (*end) {
					err = -EINVAL;
					goto nla_put_failure;
				}
				NLA_PUT_U32(msg,
					    NL80211_ATTR_SCHED_SCAN_DELAY,
					    delay);
			} else if (!strcmp(v[0], "matches")) {
				parse_state = ND_MATCH;
				if (have_matchset) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				i = 0;
			} else if (!strcmp(v[0], "freqs")) {
				parse_state = ND_FREQS;
				if (have_freqs) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				have_freqs = true;
				i = 0;
			} else if (!strcmp(v[0], "active")) {
				parse_state = ND_ACTIVE;
				if (have_active || have_passive) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				have_active = true;
				i = 0;
			} else if (!strcmp(v[0], "passive")) {
				if (have_active || have_passive) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				have_passive = true;
			} else if (!strncmp(v[0], "randomise", 9) ||
				   !strncmp(v[0], "randomize", 9)) {
				flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
				if (c > 0) {
					err = parse_random_mac_addr(msg, v[0]);
					if (err)
						goto nla_put_failure;
				}
			} else {
				/* this element is not for us, so
				 * return to continue parsing.
				 */
				goto nla_put_failure;
			}
			c--; v++;

			break;
		case ND_MATCH:
			if (!strcmp(v[0], "ssid")) {
				c--; v++;
				if (c == 0) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				/* TODO: for now we can only have an
				 * SSID in the match, so we can start
				 * the match nest here.
				 */
				match = nla_nest_start(matchset, i);
				if (!match) {
					err = -ENOBUFS;
					goto nla_put_failure;
				}

				NLA_PUT(matchset,
					NL80211_SCHED_SCAN_MATCH_ATTR_SSID,
					strlen(v[0]), v[0]);
				nla_nest_end(matchset, match);
				match = NULL;

				have_matchset = true;
				i++;
				c--; v++;
			} else {
				/* other element that cannot be part
				 * of a match indicates the end of the
				 * match. */
				/* need at least one match in the matchset */
				if (i == 0) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				parse_state = ND_TOPLEVEL;
			}

			break;
		case ND_FREQS:
			freq = strtoul(v[0], &end, 10);
			if (*end) {
				if (i == 0) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				parse_state = ND_TOPLEVEL;
			} else {
				NLA_PUT_U32(freqs, i, freq);
				i++;
				c--; v++;
			}
			break;
		case ND_ACTIVE:
			if (!strcmp(v[0], "ssid")) {
				c--; v++;
				if (c == 0) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				NLA_PUT(ssids,
					NL80211_SCHED_SCAN_MATCH_ATTR_SSID,
					strlen(v[0]), v[0]);

				have_ssids = true;
				i++;
				c--; v++;
			} else {
				/* other element that cannot be part
				 * of a match indicates the end of the
				 * active set. */
				/* need at least one item in the set */
				if (i == 0) {
					err = -EINVAL;
					goto nla_put_failure;
				}

				parse_state = ND_TOPLEVEL;
			}
			break;
		}
	}

	if (!have_ssids)
		NLA_PUT(ssids, 1, 0, "");
	if (!have_passive)
		nla_put_nested(msg, NL80211_ATTR_SCAN_SSIDS, ssids);
	if (have_freqs)
		nla_put_nested(msg, NL80211_ATTR_SCAN_FREQUENCIES, freqs);
	if (have_matchset)
		nla_put_nested(msg, NL80211_ATTR_SCHED_SCAN_MATCH, matchset);
	if (flags)
		NLA_PUT_U32(msg, NL80211_ATTR_SCAN_FLAGS, flags);

nla_put_failure:
	if (match)
		nla_nest_end(msg, match);
	nlmsg_free(freqs);
	nlmsg_free(matchset);

out:
	*argc = c;
	*argv = v;
	return err;
}

static int handle_scan(struct nl80211_state *state,
		       struct nl_cb *cb,
		       struct nl_msg *msg,
		       int argc, char **argv,
		       enum id_input id)
{
	struct nl_msg *ssids = NULL, *freqs = NULL;
	char *eptr;
	int err = -ENOBUFS;
	int i;
	enum {
		NONE,
		FREQ,
		IES,
		SSID,
		MESHID,
		DONE,
	} parse = NONE;
	int freq;
	bool passive = false, have_ssids = false, have_freqs = false;
	size_t ies_len = 0, meshid_len = 0;
	unsigned char *ies = NULL, *meshid = NULL, *tmpies;
	unsigned int flags = 0;

	ssids = nlmsg_alloc();
	if (!ssids)
		return -ENOMEM;

	freqs = nlmsg_alloc();
	if (!freqs) {
		nlmsg_free(ssids);
		return -ENOMEM;
	}

	for (i = 0; i < argc; i++) {
		switch (parse) {
		case NONE:
			if (strcmp(argv[i], "freq") == 0) {
				parse = FREQ;
				have_freqs = true;
				break;
			} else if (strcmp(argv[i], "ies") == 0) {
				parse = IES;
				break;
			} else if (strcmp(argv[i], "lowpri") == 0) {
				flags |= NL80211_SCAN_FLAG_LOW_PRIORITY;
				break;
			} else if (strcmp(argv[i], "flush") == 0) {
				flags |= NL80211_SCAN_FLAG_FLUSH;
				break;
			} else if (strcmp(argv[i], "ap-force") == 0) {
				flags |= NL80211_SCAN_FLAG_AP;
				break;
			} else if (strncmp(argv[i], "randomise", 9) == 0 ||
				   strncmp(argv[i], "randomize", 9) == 0) {
				flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
				err = parse_random_mac_addr(msg, argv[i]);
				if (err)
					goto nla_put_failure;
				break;
			} else if (strcmp(argv[i], "ssid") == 0) {
				parse = SSID;
				have_ssids = true;
				break;
			} else if (strcmp(argv[i], "passive") == 0) {
				parse = DONE;
				passive = true;
				break;
			} else if (strcmp(argv[i], "meshid") == 0) {
				parse = MESHID;
				break;
			}
		case DONE:
			return 1;
		case FREQ:
			freq = strtoul(argv[i], &eptr, 10);
			if (eptr != argv[i] + strlen(argv[i])) {
				/* failed to parse as number -- maybe a tag? */
				i--;
				parse = NONE;
				continue;
			}
			NLA_PUT_U32(freqs, i, freq);
			break;
		case IES:
			ies = parse_hex(argv[i], &ies_len);
			if (!ies)
				goto nla_put_failure;
			parse = NONE;
			break;
		case SSID:
			NLA_PUT(ssids, i, strlen(argv[i]), argv[i]);
			break;
		case MESHID:
			meshid_len = strlen(argv[i]);
			meshid = (unsigned char *) malloc(meshid_len + 2);
			if (!meshid)
				goto nla_put_failure;
			meshid[0] = 114; /* mesh element id */
			meshid[1] = meshid_len;
			memcpy(&meshid[2], argv[i], meshid_len);
			meshid_len += 2;
			parse = NONE;
			break;
		}
	}

	if (ies || meshid) {
		tmpies = (unsigned char *) malloc(ies_len + meshid_len);
		if (!tmpies)
			goto nla_put_failure;
		if (ies) {
			memcpy(tmpies, ies, ies_len);
			free(ies);
		}
		if (meshid) {
			memcpy(&tmpies[ies_len], meshid, meshid_len);
			free(meshid);
		}
		NLA_PUT(msg, NL80211_ATTR_IE, ies_len + meshid_len, tmpies);
		free(tmpies);
	}

	if (!have_ssids)
		NLA_PUT(ssids, 1, 0, "");
	if (!passive)
		nla_put_nested(msg, NL80211_ATTR_SCAN_SSIDS, ssids);

	if (have_freqs)
		nla_put_nested(msg, NL80211_ATTR_SCAN_FREQUENCIES, freqs);
	if (flags)
		NLA_PUT_U32(msg, NL80211_ATTR_SCAN_FLAGS, flags);

	err = 0;
 nla_put_failure:
	nlmsg_free(ssids);
	nlmsg_free(freqs);
	return err;
}

static void tab_on_first(bool *first)
{
	if (!*first)
		printf("\t");
	else
		*first = false;
}

static void print_ssid(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf(" ");
	print_ssid_escaped(len, data);
	printf("\n");
}

#define BSS_MEMBERSHIP_SELECTOR_VHT_PHY 126
#define BSS_MEMBERSHIP_SELECTOR_HT_PHY 127

static void print_supprates(const uint8_t type, uint8_t len, const uint8_t *data)
{
	int i;

	printf(" ");

	for (i = 0; i < len; i++) {
		int r = data[i] & 0x7f;

		if (r == BSS_MEMBERSHIP_SELECTOR_VHT_PHY && data[i] & 0x80)
			printf("VHT");
		else if (r == BSS_MEMBERSHIP_SELECTOR_HT_PHY && data[i] & 0x80)
			printf("HT");
		else
			printf("%d.%d", r/2, 5*(r&1));

		printf("%s ", data[i] & 0x80 ? "*" : "");
	}
	printf("\n");
}

static void print_ds(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf(" channel %d\n", data[0]);
}

static const char *country_env_str(char environment)
{
	switch (environment) {
	case 'I':
		return "Indoor only";
	case 'O':
		return "Outdoor only";
	case ' ':
		return "Indoor/Outdoor";
	default:
		return "bogus";
	}
}

static void print_country(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf(" %.*s", 2, data);

	printf("\tEnvironment: %s\n", country_env_str(data[2]));

	data += 3;
	len -= 3;

	if (len < 3) {
		printf("\t\tNo country IE triplets present\n");
		return;
	}

	while (len >= 3) {
		int end_channel;
		union ieee80211_country_ie_triplet *triplet = (void *) data;

		if (triplet->ext.reg_extension_id >= IEEE80211_COUNTRY_EXTENSION_ID) {
			printf("\t\tExtension ID: %d Regulatory Class: %d Coverage class: %d (up to %dm)\n",
			       triplet->ext.reg_extension_id,
			       triplet->ext.reg_class,
			       triplet->ext.coverage_class,
			       triplet->ext.coverage_class * 450);

			data += 3;
			len -= 3;
			continue;
		}

		/* 2 GHz */
		if (triplet->chans.first_channel <= 14)
			end_channel = triplet->chans.first_channel + (triplet->chans.num_channels - 1);
		else
			end_channel =  triplet->chans.first_channel + (4 * (triplet->chans.num_channels - 1));

		printf("\t\tChannels [%d - %d] @ %d dBm\n", triplet->chans.first_channel, end_channel, triplet->chans.max_power);

		data += 3;
		len -= 3;
	}

	return;
}

static void print_powerconstraint(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf(" %d dB\n", data[0]);
}

static void print_tpcreport(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf(" TX power: %d dBm\n", data[0]);
	/* printf(" Link Margin (%d dB) is reserved in Beacons\n", data[1]); */
}

static void print_erp(const uint8_t type, uint8_t len, const uint8_t *data)
{
	if (data[0] == 0x00)
		printf(" <no flags>");
	if (data[0] & 0x01)
		printf(" NonERP_Present");
	if (data[0] & 0x02)
		printf(" Use_Protection");
	if (data[0] & 0x04)
		printf(" Barker_Preamble_Mode");
	printf("\n");
}

static void print_cipher(const uint8_t *data)
{
	if (memcmp(data, ms_oui, 3) == 0) {
		switch (data[3]) {
		case 0:
			printf("Use group cipher suite");
			break;
		case 1:
			printf("WEP-40");
			break;
		case 2:
			printf("TKIP");
			break;
		case 4:
			printf("CCMP");
			break;
		case 5:
			printf("WEP-104");
			break;
		default:
			printf("%.02x-%.02x-%.02x:%d",
				data[0], data[1] ,data[2], data[3]);
			break;
		}
	} else if (memcmp(data, ieee80211_oui, 3) == 0) {
		switch (data[3]) {
		case 0:
			printf("Use group cipher suite");
			break;
		case 1:
			printf("WEP-40");
			break;
		case 2:
			printf("TKIP");
			break;
		case 4:
			printf("CCMP");
			break;
		case 5:
			printf("WEP-104");
			break;
		case 6:
			printf("AES-128-CMAC");
			break;
		case 8:
			printf("GCMP");
			break;
		default:
			printf("%.02x-%.02x-%.02x:%d",
				data[0], data[1] ,data[2], data[3]);
			break;
		}
	} else
		printf("%.02x-%.02x-%.02x:%d",
			data[0], data[1] ,data[2], data[3]);
}

static void print_auth(const uint8_t *data)
{
	if (memcmp(data, ms_oui, 3) == 0) {
		switch (data[3]) {
		case 1:
			printf("IEEE 802.1X");
			break;
		case 2:
			printf("PSK");
			break;
		default:
			printf("%.02x-%.02x-%.02x:%d",
				data[0], data[1] ,data[2], data[3]);
			break;
		}
	} else if (memcmp(data, ieee80211_oui, 3) == 0) {
		switch (data[3]) {
		case 1:
			printf("IEEE 802.1X");
			break;
		case 2:
			printf("PSK");
			break;
		case 3:
			printf("FT/IEEE 802.1X");
			break;
		case 4:
			printf("FT/PSK");
			break;
		case 5:
			printf("IEEE 802.1X/SHA-256");
			break;
		case 6:
			printf("PSK/SHA-256");
			break;
		case 7:
			printf("TDLS/TPK");
			break;
		default:
			printf("%.02x-%.02x-%.02x:%d",
				data[0], data[1] ,data[2], data[3]);
			break;
		}
	} else
		printf("%.02x-%.02x-%.02x:%d",
			data[0], data[1] ,data[2], data[3]);
}

static void print_rsn_ie(const char *defcipher, const char *defauth,
			 uint8_t len, const uint8_t *data)
{
	bool first = true;
	__u16 version, count, capa;
	int i;

	version = data[0] + (data[1] << 8);
	tab_on_first(&first);
	printf("\t * Version: %d\n", version);

	data += 2;
	len -= 2;

	if (len < 4) {
		tab_on_first(&first);
		printf("\t * Group cipher: %s\n", defcipher);
		printf("\t * Pairwise ciphers: %s\n", defcipher);
		return;
	}

	tab_on_first(&first);
	printf("\t * Group cipher: ");
	print_cipher(data);
	printf("\n");

	data += 4;
	len -= 4;

	if (len < 2) {
		tab_on_first(&first);
		printf("\t * Pairwise ciphers: %s\n", defcipher);
		return;
	}

	count = data[0] | (data[1] << 8);
	if (2 + (count * 4) > len)
		goto invalid;

	tab_on_first(&first);
	printf("\t * Pairwise ciphers:");
	for (i = 0; i < count; i++) {
		printf(" ");
		print_cipher(data + 2 + (i * 4));
	}
	printf("\n");

	data += 2 + (count * 4);
	len -= 2 + (count * 4);

	if (len < 2) {
		tab_on_first(&first);
		printf("\t * Authentication suites: %s\n", defauth);
		return;
	}

	count = data[0] | (data[1] << 8);
	if (2 + (count * 4) > len)
		goto invalid;

	tab_on_first(&first);
	printf("\t * Authentication suites:");
	for (i = 0; i < count; i++) {
		printf(" ");
		print_auth(data + 2 + (i * 4));
	}
	printf("\n");

	data += 2 + (count * 4);
	len -= 2 + (count * 4);

	if (len >= 2) {
		capa = data[0] | (data[1] << 8);
		tab_on_first(&first);
		printf("\t * Capabilities:");
		if (capa & 0x0001)
			printf(" PreAuth");
		if (capa & 0x0002)
			printf(" NoPairwise");
		switch ((capa & 0x000c) >> 2) {
		case 0:
			printf(" 1-PTKSA-RC");
			break;
		case 1:
			printf(" 2-PTKSA-RC");
			break;
		case 2:
			printf(" 4-PTKSA-RC");
			break;
		case 3:
			printf(" 16-PTKSA-RC");
			break;
		}
		switch ((capa & 0x0030) >> 4) {
		case 0:
			printf(" 1-GTKSA-RC");
			break;
		case 1:
			printf(" 2-GTKSA-RC");
			break;
		case 2:
			printf(" 4-GTKSA-RC");
			break;
		case 3:
			printf(" 16-GTKSA-RC");
			break;
		}
		if (capa & 0x0040)
			printf(" MFP-required");
		if (capa & 0x0080)
			printf(" MFP-capable");
		if (capa & 0x0200)
			printf(" Peerkey-enabled");
		if (capa & 0x0400)
			printf(" SPP-AMSDU-capable");
		if (capa & 0x0800)
			printf(" SPP-AMSDU-required");
		printf(" (0x%.4x)\n", capa);
		data += 2;
		len -= 2;
	}

	if (len >= 2) {
		int pmkid_count = data[0] | (data[1] << 8);

		if (len >= 2 + 16 * pmkid_count) {
			tab_on_first(&first);
			printf("\t * %d PMKIDs\n", pmkid_count);
			/* not printing PMKID values */
			data += 2 + 16 * pmkid_count;
			len -= 2 + 16 * pmkid_count;
		} else
			goto invalid;
	}

	if (len >= 4) {
		tab_on_first(&first);
		printf("\t * Group mgmt cipher suite: ");
		print_cipher(data);
		printf("\n");
		data += 4;
		len -= 4;
	}

 invalid:
	if (len != 0) {
		printf("\t\t * bogus tail data (%d):", len);
		while (len) {
			printf(" %.2x", *data);
			data++;
			len--;
		}
		printf("\n");
	}
}

static void print_rsn(const uint8_t type, uint8_t len, const uint8_t *data)
{
	print_rsn_ie("CCMP", "IEEE 802.1X", len, data);
}

static void print_ht_capa(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf("\n");
	print_ht_capability(data[0] | (data[1] << 8));
	print_ampdu_length(data[2] & 3);
	print_ampdu_spacing((data[2] >> 2) & 7);
	print_ht_mcs(data + 3);
}

static const char* ntype_11u(uint8_t t)
{
	switch (t) {
	case 0: return "Private";
	case 1: return "Private with Guest";
	case 2: return "Chargeable Public";
	case 3: return "Free Public";
	case 4: return "Personal Device";
	case 5: return "Emergency Services Only";
	case 14: return "Test or Experimental";
	case 15: return "Wildcard";
	default: return "Reserved";
	}
}

static const char* vgroup_11u(uint8_t t)
{
	switch (t) {
	case 0: return "Unspecified";
	case 1: return "Assembly";
	case 2: return "Business";
	case 3: return "Educational";
	case 4: return "Factory and Industrial";
	case 5: return "Institutional";
	case 6: return "Mercantile";
	case 7: return "Residential";
	case 8: return "Storage";
	case 9: return "Utility and Miscellaneous";
	case 10: return "Vehicular";
	case 11: return "Outdoor";
	default: return "Reserved";
	}
}

static void print_interworking(const uint8_t type, uint8_t len, const uint8_t *data)
{
	/* See Section 7.3.2.92 in the 802.11u spec. */
	printf("\n");
	if (len >= 1) {
		uint8_t ano = data[0];
		printf("\t\tNetwork Options: 0x%hx\n", (unsigned short)(ano));
		printf("\t\t\tNetwork Type: %i (%s)\n",
		       (int)(ano & 0xf), ntype_11u(ano & 0xf));
		if (ano & (1<<4))
			printf("\t\t\tInternet\n");
		if (ano & (1<<5))
			printf("\t\t\tASRA\n");
		if (ano & (1<<6))
			printf("\t\t\tESR\n");
		if (ano & (1<<7))
			printf("\t\t\tUESA\n");
	}
	if ((len == 3) || (len == 9)) {
		printf("\t\tVenue Group: %i (%s)\n",
		       (int)(data[1]), vgroup_11u(data[1]));
		printf("\t\tVenue Type: %i\n", (int)(data[2]));
	}
	if (len == 9)
		printf("\t\tHESSID: %02hx:%02hx:%02hx:%02hx:%02hx:%02hx\n",
		       data[3], data[4], data[5], data[6], data[7], data[8]);
	else if (len == 7)
		printf("\t\tHESSID: %02hx:%02hx:%02hx:%02hx:%02hx:%02hx\n",
		       data[1], data[2], data[3], data[4], data[5], data[6]);
}

static void print_11u_advert(const uint8_t type, uint8_t len, const uint8_t *data)
{
	/* See Section 7.3.2.93 in the 802.11u spec. */
	/* TODO: This code below does not decode private protocol IDs */
	int idx = 0;
	printf("\n");
	while (idx < (len - 1)) {
		uint8_t qri = data[idx];
		uint8_t proto_id = data[idx + 1];
		printf("\t\tQuery Response Info: 0x%hx\n", (unsigned short)(qri));
		printf("\t\t\tQuery Response Length Limit: %i\n",
		       (qri & 0x7f));
		if (qri & (1<<7))
			printf("\t\t\tPAME-BI\n");
		switch(proto_id) {
		case 0:
			printf("\t\t\tANQP\n"); break;
		case 1:
			printf("\t\t\tMIH Information Service\n"); break;
		case 2:
			printf("\t\t\tMIH Command and Event Services Capability Discovery\n"); break;
		case 3:
			printf("\t\t\tEmergency Alert System (EAS)\n"); break;
		case 221:
			printf("\t\t\tVendor Specific\n"); break;
		default:
			printf("\t\t\tReserved: %i\n", proto_id); break;
		}
		idx += 2;
	}
}

static void print_11u_rcon(const uint8_t type, uint8_t len, const uint8_t *data)
{
	/* See Section 7.3.2.96 in the 802.11u spec. */
	int idx = 0;
	int ln0 = data[1] & 0xf;
	int ln1 = ((data[1] & 0xf0) >> 4);
	int ln2 = 0;
	printf("\n");

	if (ln1)
		ln2 = len - 2 - ln0 - ln1;

	printf("\t\tANQP OIs: %i\n", data[0]);

	if (ln0 > 0) {
		printf("\t\tOI 1: ");
		if (2 + ln0 > len) {
			printf("Invalid IE length.\n");
		} else {
			for (idx = 0; idx < ln0; idx++) {
				printf("%02hx", data[2 + idx]);
			}
			printf("\n");
		}
	}

	if (ln1 > 0) {
		printf("\t\tOI 2: ");
		if (2 + ln0 + ln1 > len) {
			printf("Invalid IE length.\n");
		} else {
			for (idx = 0; idx < ln1; idx++) {
				printf("%02hx", data[2 + ln0 + idx]);
			}
			printf("\n");
		}
	}

	if (ln2 > 0) {
		printf("\t\tOI 3: ");
		if (2 + ln0 + ln1 + ln2 > len) {
			printf("Invalid IE length.\n");
		} else {
			for (idx = 0; idx < ln2; idx++) {
				printf("%02hx", data[2 + ln0 + ln1 + idx]);
			}
			printf("\n");
		}
	}
}

static const char *ht_secondary_offset[4] = {
	"no secondary",
	"above",
	"[reserved!]",
	"below",
};

static void print_ht_op(const uint8_t type, uint8_t len, const uint8_t *data)
{
	static const char *protection[4] = {
		"no",
		"nonmember",
		"20 MHz",
		"non-HT mixed",
	};
	static const char *sta_chan_width[2] = {
		"20 MHz",
		"any",
	};

	printf("\n");
	printf("\t\t * primary channel: %d\n", data[0]);
	printf("\t\t * secondary channel offset: %s\n",
		ht_secondary_offset[data[1] & 0x3]);
	printf("\t\t * STA channel width: %s\n", sta_chan_width[(data[1] & 0x4)>>2]);
	printf("\t\t * RIFS: %d\n", (data[1] & 0x8)>>3);
	printf("\t\t * HT protection: %s\n", protection[data[2] & 0x3]);
	printf("\t\t * non-GF present: %d\n", (data[2] & 0x4) >> 2);
	printf("\t\t * OBSS non-GF present: %d\n", (data[2] & 0x10) >> 4);
	printf("\t\t * dual beacon: %d\n", (data[4] & 0x40) >> 6);
	printf("\t\t * dual CTS protection: %d\n", (data[4] & 0x80) >> 7);
	printf("\t\t * STBC beacon: %d\n", data[5] & 0x1);
	printf("\t\t * L-SIG TXOP Prot: %d\n", (data[5] & 0x2) >> 1);
	printf("\t\t * PCO active: %d\n", (data[5] & 0x4) >> 2);
	printf("\t\t * PCO phase: %d\n", (data[5] & 0x8) >> 3);
}

static void print_capabilities(const uint8_t type, uint8_t len, const uint8_t *data)
{
	int i, base, bit;
	bool first = true;


	for (i = 0; i < len; i++) {
		base = i * 8;

		for (bit = 0; bit < 8; bit++) {
			if (!(data[i] & (1 << bit)))
				continue;

			if (!first)
				printf(",");
			else
				first = false;

#define CAPA(bit, name)		case bit: printf(" " name); break

			switch (bit + base) {
			CAPA(0, "HT Information Exchange Supported");
			CAPA(1, "reserved (On-demand Beacon)");
			CAPA(2, "Extended Channel Switching");
			CAPA(3, "reserved (Wave Indication)");
			CAPA(4, "PSMP Capability");
			CAPA(5, "reserved (Service Interval Granularity)");
			CAPA(6, "S-PSMP Capability");
			CAPA(7, "Event");
			CAPA(8, "Diagnostics");
			CAPA(9, "Multicast Diagnostics");
			CAPA(10, "Location Tracking");
			CAPA(11, "FMS");
			CAPA(12, "Proxy ARP Service");
			CAPA(13, "Collocated Interference Reporting");
			CAPA(14, "Civic Location");
			CAPA(15, "Geospatial Location");
			CAPA(16, "TFS");
			CAPA(17, "WNM-Sleep Mode");
			CAPA(18, "TIM Broadcast");
			CAPA(19, "BSS Transition");
			CAPA(20, "QoS Traffic Capability");
			CAPA(21, "AC Station Count");
			CAPA(22, "Multiple BSSID");
			CAPA(23, "Timing Measurement");
			CAPA(24, "Channel Usage");
			CAPA(25, "SSID List");
			CAPA(26, "DMS");
			CAPA(27, "UTC TSF Offset");
			CAPA(28, "TDLS Peer U-APSD Buffer STA Support");
			CAPA(29, "TDLS Peer PSM Support");
			CAPA(30, "TDLS channel switching");
			CAPA(31, "Interworking");
			CAPA(32, "QoS Map");
			CAPA(33, "EBR");
			CAPA(34, "SSPN Interface");
			CAPA(35, "Reserved");
			CAPA(36, "MSGCF Capability");
			CAPA(37, "TDLS Support");
			CAPA(38, "TDLS Prohibited");
			CAPA(39, "TDLS Channel Switching Prohibited");
			CAPA(40, "Reject Unadmitted Frame");
			CAPA(44, "Identifier Location");
			CAPA(45, "U-APSD Coexistence");
			CAPA(46, "WNM-Notification");
			CAPA(47, "Reserved");
			CAPA(48, "UTF-8 SSID");
			default:
				printf(" %d", bit);
				break;
			}
#undef CAPA
		}
	}

	printf("\n");
}

static void print_tim(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf(" DTIM Count %u DTIM Period %u Bitmap Control 0x%x "
	       "Bitmap[0] 0x%x",
	       data[0], data[1], data[2], data[3]);
	if (len - 4)
		printf(" (+ %u octet%s)", len - 4, len - 4 == 1 ? "" : "s");
	printf("\n");
}

static void print_ibssatim(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf(" %d TUs", (data[1] << 8) + data[0]);
}

static void print_vht_capa(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf("\n");
	print_vht_info(data[0] | (data[1] << 8) |
		       (data[2] << 16) | (data[3] << 24),
		       data + 4);
}

static void print_vht_oper(const uint8_t type, uint8_t len, const uint8_t *data)
{
	const char *chandwidths[] = {
		[0] = "20 or 40 MHz",
		[1] = "80 MHz",
		[3] = "80+80 MHz",
		[2] = "160 MHz",
	};

	printf("\n");
	printf("\t\t * channel width: %d (%s)\n", data[0],
		data[0] < ARRAY_SIZE(chandwidths) ? chandwidths[data[0]] : "unknown");
	printf("\t\t * center freq segment 1: %d\n", data[1]);
	printf("\t\t * center freq segment 2: %d\n", data[2]);
	printf("\t\t * VHT basic MCS set: 0x%.2x%.2x\n", data[4], data[3]);
}

static void print_obss_scan_params(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf("\n");
	printf("\t\t * passive dwell: %d TUs\n", (data[1] << 8) | data[0]);
	printf("\t\t * active dwell: %d TUs\n", (data[3] << 8) | data[2]);
	printf("\t\t * channel width trigger scan interval: %d s\n", (data[5] << 8) | data[4]);
	printf("\t\t * scan passive total per channel: %d TUs\n", (data[7] << 8) | data[6]);
	printf("\t\t * scan active total per channel: %d TUs\n", (data[9] << 8) | data[8]);
	printf("\t\t * BSS width channel transition delay factor: %d\n", (data[11] << 8) | data[10]);
	printf("\t\t * OBSS Scan Activity Threshold: %d.%02d %%\n",
		((data[13] << 8) | data[12]) / 100, ((data[13] << 8) | data[12]) % 100);
}

static void print_secchan_offs(const uint8_t type, uint8_t len, const uint8_t *data)
{
	if (data[0] < ARRAY_SIZE(ht_secondary_offset))
		printf(" %s (%d)\n", ht_secondary_offset[data[0]], data[0]);
	else
		printf(" %d\n", data[0]);
}

static void print_bss_load(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf("\n");
	printf("\t\t * station count: %d\n", (data[1] << 8) | data[0]);
	printf("\t\t * channel utilisation: %d/255\n", data[2]);
	printf("\t\t * available admission capacity: %d [*32us]\n", (data[4] << 8) | data[3]);
}

static void print_mesh_conf(const uint8_t type, uint8_t len, const uint8_t *data)
{
	printf("\n");
	printf("\t\t * Active Path Selection Protocol ID: %d\n", data[0]);
	printf("\t\t * Active Path Selection Metric ID: %d\n", data[1]);
	printf("\t\t * Congestion Control Mode ID: %d\n", data[2]);
	printf("\t\t * Synchronization Method ID: %d\n", data[3]);
	printf("\t\t * Authentication Protocol ID: %d\n", data[4]);
	printf("\t\t * Mesh Formation Info:\n");
	printf("\t\t\t Number of Peerings: %d\n", (data[5] & 0x7E) >> 1);
	if (data[5] & 0x01)
		printf("\t\t\t Connected to Mesh Gate\n");
	if (data[5] & 0x80)
		printf("\t\t\t Connected to AS\n");
	printf("\t\t * Mesh Capability\n");
	if (data[6] & 0x01)
		printf("\t\t\t Accepting Additional Mesh Peerings\n");
	if (data[6] & 0x02)
		printf("\t\t\t MCCA Supported\n");
	if (data[6] & 0x04)
		printf("\t\t\t MCCA Enabled\n");
	if (data[6] & 0x08)
		printf("\t\t\t Forwarding\n");
	if (data[6] & 0x10)
		printf("\t\t\t MBCA Supported\n");
	if (data[6] & 0x20)
		printf("\t\t\t TBTT Adjusting\n");
	if (data[6] & 0x40)
		printf("\t\t\t Mesh Power Save Level\n");
}

struct ie_print {
	const char *name;
	void (*print)(const uint8_t type, uint8_t len, const uint8_t *data);
	uint8_t minlen, maxlen;
	uint8_t flags;
};

static void print_ie(const struct ie_print *p, const uint8_t type,
		     uint8_t len, const uint8_t *data)
{
	int i;

	if (!p->print)
		return;

	printf("\t%s:", p->name);
	if (len < p->minlen || len > p->maxlen) {
		if (len > 1) {
			printf(" <invalid: %d bytes:", len);
			for (i = 0; i < len; i++)
				printf(" %.02x", data[i]);
			printf(">\n");
		} else if (len)
			printf(" <invalid: 1 byte: %.02x>\n", data[0]);
		else
			printf(" <invalid: no data>\n");
		return;
	}

	p->print(type, len, data);
}

#define PRINT_IGN {		\
	.name = "IGNORE",	\
	.print = NULL,		\
	.minlen = 0,		\
	.maxlen = 255,		\
}

static const struct ie_print ieprinters[] = {
	[0] = { "SSID", print_ssid, 0, 32, BIT(PRINT_SCAN) | BIT(PRINT_LINK), },
	[1] = { "Supported rates", print_supprates, 0, 255, BIT(PRINT_SCAN), },
	[3] = { "DS Parameter set", print_ds, 1, 1, BIT(PRINT_SCAN), },
	[5] = { "TIM", print_tim, 4, 255, BIT(PRINT_SCAN), },
	[6] = { "IBSS ATIM window", print_ibssatim, 2, 2, BIT(PRINT_SCAN), },
	[7] = { "Country", print_country, 3, 255, BIT(PRINT_SCAN), },
	[11] = { "BSS Load", print_bss_load, 5, 5, BIT(PRINT_SCAN), },
	[32] = { "Power constraint", print_powerconstraint, 1, 1, BIT(PRINT_SCAN), },
	[35] = { "TPC report", print_tpcreport, 2, 2, BIT(PRINT_SCAN), },
	[42] = { "ERP", print_erp, 1, 255, BIT(PRINT_SCAN), },
	[45] = { "HT capabilities", print_ht_capa, 26, 26, BIT(PRINT_SCAN), },
	[47] = { "ERP D4.0", print_erp, 1, 255, BIT(PRINT_SCAN), },
	[74] = { "Overlapping BSS scan params", print_obss_scan_params, 14, 255, BIT(PRINT_SCAN), },
	[61] = { "HT operation", print_ht_op, 22, 22, BIT(PRINT_SCAN), },
	[62] = { "Secondary Channel Offset", print_secchan_offs, 1, 1, BIT(PRINT_SCAN), },
	[191] = { "VHT capabilities", print_vht_capa, 12, 255, BIT(PRINT_SCAN), },
	[192] = { "VHT operation", print_vht_oper, 5, 255, BIT(PRINT_SCAN), },
	[48] = { "RSN", print_rsn, 2, 255, BIT(PRINT_SCAN), },
	[50] = { "Extended supported rates", print_supprates, 0, 255, BIT(PRINT_SCAN), },
	[113] = { "MESH Configuration", print_mesh_conf, 7, 7, BIT(PRINT_SCAN), },
	[114] = { "MESH ID", print_ssid, 0, 32, BIT(PRINT_SCAN) | BIT(PRINT_LINK), },
	[127] = { "Extended capabilities", print_capabilities, 0, 255, BIT(PRINT_SCAN), },
	[107] = { "802.11u Interworking", print_interworking, 0, 255, BIT(PRINT_SCAN), },
	[108] = { "802.11u Advertisement", print_11u_advert, 0, 255, BIT(PRINT_SCAN), },
	[111] = { "802.11u Roaming Consortium", print_11u_rcon, 0, 255, BIT(PRINT_SCAN), },
};

static void print_wifi_wpa(const uint8_t type, uint8_t len, const uint8_t *data)
{
	print_rsn_ie("TKIP", "IEEE 802.1X", len, data);
}

static bool print_wifi_wmm_param(const uint8_t *data, uint8_t len)
{
	int i;
	static const char *aci_tbl[] = { "BE", "BK", "VI", "VO" };

	if (len < 19)
		goto invalid;

	if (data[0] != 1) {
		printf("Parameter: not version 1: ");
		return false;
	}

	printf("\t * Parameter version 1");

	data++;

	if (data[0] & 0x80)
		printf("\n\t\t * u-APSD");

	data += 2;

	for (i = 0; i < 4; i++) {
		printf("\n\t\t * %s:", aci_tbl[(data[0] >> 5) & 3]);
		if (data[0] & 0x10)
			printf(" acm");
		printf(" CW %d-%d", (1 << (data[1] & 0xf)) - 1,
				    (1 << (data[1] >> 4)) - 1);
		printf(", AIFSN %d", data[0] & 0xf);
		if (data[2] | data[3])
			printf(", TXOP %d usec", (data[2] + (data[3] << 8)) * 32);
		data += 4;
	}

	printf("\n");
	return true;

 invalid:
 	printf("invalid: ");
 	return false;
}

static void print_wifi_wmm(const uint8_t type, uint8_t len, const uint8_t *data)
{
	int i;

	switch (data[0]) {
	case 0x00:
		printf(" information:");
		break;
	case 0x01:
		if (print_wifi_wmm_param(data + 1, len - 1))
			return;
		break;
	default:
		printf(" type %d:", data[0]);
		break;
	}

	for(i = 1; i < len; i++)
		printf(" %.02x", data[i]);
	printf("\n");
}

static const char * wifi_wps_dev_passwd_id(uint16_t id)
{
	switch (id) {
	case 0:
		return "Default (PIN)";
	case 1:
		return "User-specified";
	case 2:
		return "Machine-specified";
	case 3:
		return "Rekey";
	case 4:
		return "PushButton";
	case 5:
		return "Registrar-specified";
	default:
		return "??";
	}
}

static void print_wifi_wps(const uint8_t type, uint8_t len, const uint8_t *data)
{
	bool first = true;
	__u16 subtype, sublen;

	while (len >= 4) {
		subtype = (data[0] << 8) + data[1];
		sublen = (data[2] << 8) + data[3];
		if (sublen > len)
			break;

		switch (subtype) {
		case 0x104a:
			tab_on_first(&first);
			printf("\t * Version: %d.%d\n", data[4] >> 4, data[4] & 0xF);
			break;
		case 0x1011:
			tab_on_first(&first);
			printf("\t * Device name: %.*s\n", sublen, data + 4);
			break;
		case 0x1012: {
			uint16_t id;
			tab_on_first(&first);
			if (sublen != 2) {
				printf("\t * Device Password ID: (invalid "
				       "length %d)\n", sublen);
				break;
			}
			id = data[4] << 8 | data[5];
			printf("\t * Device Password ID: %u (%s)\n",
			       id, wifi_wps_dev_passwd_id(id));
			break;
		}
		case 0x1021:
			tab_on_first(&first);
			printf("\t * Manufacturer: %.*s\n", sublen, data + 4);
			break;
		case 0x1023:
			tab_on_first(&first);
			printf("\t * Model: %.*s\n", sublen, data + 4);
			break;
		case 0x1024:
			tab_on_first(&first);
			printf("\t * Model Number: %.*s\n", sublen, data + 4);
			break;
		case 0x103b: {
			__u8 val = data[4];
			tab_on_first(&first);
			printf("\t * Response Type: %d%s\n",
			       val, val == 3 ? " (AP)" : "");
			break;
		}
		case 0x103c: {
			__u8 val = data[4];
			tab_on_first(&first);
			printf("\t * RF Bands: 0x%x\n", val);
			break;
		}
		case 0x1041: {
			__u8 val = data[4];
			tab_on_first(&first);
			printf("\t * Selected Registrar: 0x%x\n", val);
			break;
		}
		case 0x1042:
			tab_on_first(&first);
			printf("\t * Serial Number: %.*s\n", sublen, data + 4);
			break;
		case 0x1044: {
			__u8 val = data[4];
			tab_on_first(&first);
			printf("\t * Wi-Fi Protected Setup State: %d%s%s\n",
			       val,
			       val == 1 ? " (Unconfigured)" : "",
			       val == 2 ? " (Configured)" : "");
			break;
		}
		case 0x1047:
			tab_on_first(&first);
			printf("\t * UUID: ");
			if (sublen != 16) {
				printf("(invalid, length=%d)\n", sublen);
				break;
			}
			printf("%02x%02x%02x%02x-%02x%02x-%02x%02x-"
				"%02x%02x-%02x%02x%02x%02x%02x%02x\n",
				data[4], data[5], data[6], data[7],
				data[8], data[9], data[10], data[11],
				data[12], data[13], data[14], data[15],
				data[16], data[17], data[18], data[19]);
			break;
		case 0x1054: {
			tab_on_first(&first);
			if (sublen != 8) {
				printf("\t * Primary Device Type: (invalid "
				       "length %d)\n", sublen);
				break;
			}
			printf("\t * Primary Device Type: "
			       "%u-%02x%02x%02x%02x-%u\n",
			       data[4] << 8 | data[5],
			       data[6], data[7], data[8], data[9],
			       data[10] << 8 | data[11]);
			break;
		}
		case 0x1057: {
			__u8 val = data[4];
			tab_on_first(&first);
			printf("\t * AP setup locked: 0x%.2x\n", val);
			break;
		}
		case 0x1008:
		case 0x1053: {
			__u16 meth = (data[4] << 8) + data[5];
			bool comma = false;
			tab_on_first(&first);
			printf("\t * %sConfig methods:",
			       subtype == 0x1053 ? "Selected Registrar ": "");
#define T(bit, name) do {		\
	if (meth & (1<<bit)) {		\
		if (comma)		\
			printf(",");	\
		comma = true;		\
		printf(" " name);	\
	} } while (0)
			T(0, "USB");
			T(1, "Ethernet");
			T(2, "Label");
			T(3, "Display");
			T(4, "Ext. NFC");
			T(5, "Int. NFC");
			T(6, "NFC Intf.");
			T(7, "PBC");
			T(8, "Keypad");
			printf("\n");
			break;
#undef T
		}
		default: {
			const __u8 *subdata = data + 4;
			__u16 tmplen = sublen;

			tab_on_first(&first);
			printf("\t * Unknown TLV (%#.4x, %d bytes):",
			       subtype, tmplen);
			while (tmplen) {
				printf(" %.2x", *subdata);
				subdata++;
				tmplen--;
			}
			printf("\n");
			break;
		}
		}

		data += sublen + 4;
		len -= sublen + 4;
	}

	if (len != 0) {
		printf("\t\t * bogus tail data (%d):", len);
		while (len) {
			printf(" %.2x", *data);
			data++;
			len--;
		}
		printf("\n");
	}
}

static const struct ie_print wifiprinters[] = {
	[1] = { "WPA", print_wifi_wpa, 2, 255, BIT(PRINT_SCAN), },
	[2] = { "WMM", print_wifi_wmm, 1, 255, BIT(PRINT_SCAN), },
	[4] = { "WPS", print_wifi_wps, 0, 255, BIT(PRINT_SCAN), },
};

static inline void print_p2p(const uint8_t type, uint8_t len, const uint8_t *data)
{
	bool first = true;
	__u8 subtype;
	__u16 sublen;

	while (len >= 3) {
		subtype = data[0];
		sublen = (data[2] << 8) + data[1];

		if (sublen > len - 3)
			break;

		switch (subtype) {
		case 0x02: /* capability */
			tab_on_first(&first);
			if (sublen < 2) {
				printf("\t * malformed capability\n");
				break;
			}
			printf("\t * Group capa: 0x%.2x, Device capa: 0x%.2x\n",
				data[3], data[4]);
			break;
		case 0x0d: /* device info */
			if (sublen < 6 + 2 + 8 + 1) {
				printf("\t * malformed device info\n");
				break;
			}
			/* fall through for now */
		case 0x00: /* status */
		case 0x01: /* minor reason */
		case 0x03: /* device ID */
		case 0x04: /* GO intent */
		case 0x05: /* configuration timeout */
		case 0x06: /* listen channel */
		case 0x07: /* group BSSID */
		case 0x08: /* ext listen timing */
		case 0x09: /* intended interface address */
		case 0x0a: /* manageability */
		case 0x0b: /* channel list */
		case 0x0c: /* NoA */
		case 0x0e: /* group info */
		case 0x0f: /* group ID */
		case 0x10: /* interface */
		case 0x11: /* operating channel */
		case 0x12: /* invitation flags */
		case 0xdd: /* vendor specific */
		default: {
			const __u8 *subdata = data + 4;
			__u16 tmplen = sublen;

			tab_on_first(&first);
			printf("\t * Unknown TLV (%#.2x, %d bytes):",
			       subtype, tmplen);
			while (tmplen) {
				printf(" %.2x", *subdata);
				subdata++;
				tmplen--;
			}
			printf("\n");
			break;
		}
		}

		data += sublen + 3;
		len -= sublen + 3;
	}

	if (len != 0) {
		tab_on_first(&first);
		printf("\t * bogus tail data (%d):", len);
		while (len) {
			printf(" %.2x", *data);
			data++;
			len--;
		}
		printf("\n");
	}
}

static inline void print_hs20_ind(const uint8_t type, uint8_t len, const uint8_t *data)
{
	/* I can't find the spec for this...just going off what wireshark uses. */
	printf("\n");
	if (len > 0)
		printf("\t\tDGAF: %i\n", (int)(data[0] & 0x1));
	else
		printf("\t\tUnexpected length: %i\n", len);
}

static const struct ie_print wfa_printers[] = {
	[9] = { "P2P", print_p2p, 2, 255, BIT(PRINT_SCAN), },
	[16] = { "HotSpot 2.0 Indication", print_hs20_ind, 1, 255, BIT(PRINT_SCAN), },
};

static void print_vendor(unsigned char len, unsigned char *data,
			 bool unknown, enum print_ie_type ptype)
{
	int i;

	if (len < 3) {
		printf("\tVendor specific: <too short> data:");
		for(i = 0; i < len; i++)
			printf(" %.02x", data[i]);
		printf("\n");
		return;
	}

	if (len >= 4 && memcmp(data, ms_oui, 3) == 0) {
		if (data[3] < ARRAY_SIZE(wifiprinters) &&
		    wifiprinters[data[3]].name &&
		    wifiprinters[data[3]].flags & BIT(ptype)) {
			print_ie(&wifiprinters[data[3]], data[3], len - 4, data + 4);
			return;
		}
		if (!unknown)
			return;
		printf("\tMS/WiFi %#.2x, data:", data[3]);
		for(i = 0; i < len - 4; i++)
			printf(" %.02x", data[i + 4]);
		printf("\n");
		return;
	}

	if (len >= 4 && memcmp(data, wfa_oui, 3) == 0) {
		if (data[3] < ARRAY_SIZE(wfa_printers) &&
		    wfa_printers[data[3]].name &&
		    wfa_printers[data[3]].flags & BIT(ptype)) {
			print_ie(&wfa_printers[data[3]], data[3], len - 4, data + 4);
			return;
		}
		if (!unknown)
			return;
		printf("\tWFA %#.2x, data:", data[3]);
		for(i = 0; i < len - 4; i++)
			printf(" %.02x", data[i + 4]);
		printf("\n");
		return;
	}

	if (!unknown)
		return;

	printf("\tVendor specific: OUI %.2x:%.2x:%.2x, data:",
		data[0], data[1], data[2]);
	for (i = 3; i < len; i++)
		printf(" %.2x", data[i]);
	printf("\n");
}

void print_ies(unsigned char *ie, int ielen, bool unknown,
	       enum print_ie_type ptype)
{
	while (ielen >= 2 && ielen >= ie[1]) {
		if (ie[0] < ARRAY_SIZE(ieprinters) &&
		    ieprinters[ie[0]].name &&
		    ieprinters[ie[0]].flags & BIT(ptype)) {
			print_ie(&ieprinters[ie[0]], ie[0], ie[1], ie + 2);
		} else if (ie[0] == 221 /* vendor */) {
			print_vendor(ie[1], ie + 2, unknown, ptype);
		} else if (unknown) {
			int i;

			printf("\tUnknown IE (%d):", ie[0]);
			for (i=0; i<ie[1]; i++)
				printf(" %.2x", ie[2+i]);
			printf("\n");
		}
		ielen -= ie[1] + 2;
		ie += ie[1] + 2;
	}
}

static void print_capa_dmg(__u16 capa)
{
	switch (capa & WLAN_CAPABILITY_DMG_TYPE_MASK) {
	case WLAN_CAPABILITY_DMG_TYPE_AP:
		printf(" DMG_ESS");
		break;
	case WLAN_CAPABILITY_DMG_TYPE_PBSS:
		printf(" DMG_PCP");
		break;
	case WLAN_CAPABILITY_DMG_TYPE_IBSS:
		printf(" DMG_IBSS");
		break;
	}

	if (capa & WLAN_CAPABILITY_DMG_CBAP_ONLY)
		printf(" CBAP_Only");
	if (capa & WLAN_CAPABILITY_DMG_CBAP_SOURCE)
		printf(" CBAP_Src");
	if (capa & WLAN_CAPABILITY_DMG_PRIVACY)
		printf(" Privacy");
	if (capa & WLAN_CAPABILITY_DMG_ECPAC)
		printf(" ECPAC");
	if (capa & WLAN_CAPABILITY_DMG_SPECTRUM_MGMT)
		printf(" SpectrumMgmt");
	if (capa & WLAN_CAPABILITY_DMG_RADIO_MEASURE)
		printf(" RadioMeasure");
}

static void print_capa_non_dmg(__u16 capa)
{
	if (capa & WLAN_CAPABILITY_ESS)
		printf(" ESS");
	if (capa & WLAN_CAPABILITY_IBSS)
		printf(" IBSS");
	if (capa & WLAN_CAPABILITY_CF_POLLABLE)
		printf(" CfPollable");
	if (capa & WLAN_CAPABILITY_CF_POLL_REQUEST)
		printf(" CfPollReq");
	if (capa & WLAN_CAPABILITY_PRIVACY)
		printf(" Privacy");
	if (capa & WLAN_CAPABILITY_SHORT_PREAMBLE)
		printf(" ShortPreamble");
	if (capa & WLAN_CAPABILITY_PBCC)
		printf(" PBCC");
	if (capa & WLAN_CAPABILITY_CHANNEL_AGILITY)
		printf(" ChannelAgility");
	if (capa & WLAN_CAPABILITY_SPECTRUM_MGMT)
		printf(" SpectrumMgmt");
	if (capa & WLAN_CAPABILITY_QOS)
		printf(" QoS");
	if (capa & WLAN_CAPABILITY_SHORT_SLOT_TIME)
		printf(" ShortSlotTime");
	if (capa & WLAN_CAPABILITY_APSD)
		printf(" APSD");
	if (capa & WLAN_CAPABILITY_RADIO_MEASURE)
		printf(" RadioMeasure");
	if (capa & WLAN_CAPABILITY_DSSS_OFDM)
		printf(" DSSS-OFDM");
	if (capa & WLAN_CAPABILITY_DEL_BACK)
		printf(" DelayedBACK");
	if (capa & WLAN_CAPABILITY_IMM_BACK)
		printf(" ImmediateBACK");
}

static int print_bss_handler(struct nl_msg *msg, void *arg)
{
	struct nlattr *tb[NL80211_ATTR_MAX + 1];
	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
	struct nlattr *bss[NL80211_BSS_MAX + 1];
	char mac_addr[20], dev[20];
	static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
		[NL80211_BSS_TSF] = { .type = NLA_U64 },
		[NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
		[NL80211_BSS_BSSID] = { },
		[NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
		[NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
		[NL80211_BSS_INFORMATION_ELEMENTS] = { },
		[NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
		[NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
		[NL80211_BSS_STATUS] = { .type = NLA_U32 },
		[NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 },
		[NL80211_BSS_BEACON_IES] = { },
	};
	struct scan_params *params = arg;
	int show = params->show_both_ie_sets ? 2 : 1;
	bool is_dmg = false;

	nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
		  genlmsg_attrlen(gnlh, 0), NULL);

	if (!tb[NL80211_ATTR_BSS]) {
		fprintf(stderr, "bss info missing!\n");
		return NL_SKIP;
	}
	if (nla_parse_nested(bss, NL80211_BSS_MAX,
			     tb[NL80211_ATTR_BSS],
			     bss_policy)) {
		fprintf(stderr, "failed to parse nested attributes!\n");
		return NL_SKIP;
	}

	if (!bss[NL80211_BSS_BSSID])
		return NL_SKIP;

	mac_addr_n2a(mac_addr, nla_data(bss[NL80211_BSS_BSSID]));
	printf("BSS %s", mac_addr);
	if (tb[NL80211_ATTR_IFINDEX]) {
		if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev);
		printf("(on %s)", dev);
	}

	if (bss[NL80211_BSS_STATUS]) {
		switch (nla_get_u32(bss[NL80211_BSS_STATUS])) {
		case NL80211_BSS_STATUS_AUTHENTICATED:
			printf(" -- authenticated");
			break;
		case NL80211_BSS_STATUS_ASSOCIATED:
			printf(" -- associated");
			break;
		case NL80211_BSS_STATUS_IBSS_JOINED:
			printf(" -- joined");
			break;
		default:
			printf(" -- unknown status: %d",
				nla_get_u32(bss[NL80211_BSS_STATUS]));
			break;
		}
	}
	printf("\n");

	if (bss[NL80211_BSS_TSF]) {
		unsigned long long tsf;
		tsf = (unsigned long long)nla_get_u64(bss[NL80211_BSS_TSF]);
		printf("\tTSF: %llu usec (%llud, %.2lld:%.2llu:%.2llu)\n",
			tsf, tsf/1000/1000/60/60/24, (tsf/1000/1000/60/60) % 24,
			(tsf/1000/1000/60) % 60, (tsf/1000/1000) % 60);
	}
	if (bss[NL80211_BSS_FREQUENCY]) {
		int freq = nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
		printf("\tfreq: %d\n", freq);
		if (freq > 45000)
			is_dmg = true;
	}
	if (bss[NL80211_BSS_BEACON_INTERVAL])
		printf("\tbeacon interval: %d TUs\n",
			nla_get_u16(bss[NL80211_BSS_BEACON_INTERVAL]));
	if (bss[NL80211_BSS_CAPABILITY]) {
		__u16 capa = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
		printf("\tcapability:");
		if (is_dmg)
			print_capa_dmg(capa);
		else
			print_capa_non_dmg(capa);
		printf(" (0x%.4x)\n", capa);
	}
	if (bss[NL80211_BSS_SIGNAL_MBM]) {
		int s = nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]);
		printf("\tsignal: %d.%.2d dBm\n", s/100, s%100);
	}
	if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
		unsigned char s = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
		printf("\tsignal: %d/100\n", s);
	}
	if (bss[NL80211_BSS_SEEN_MS_AGO]) {
		int age = nla_get_u32(bss[NL80211_BSS_SEEN_MS_AGO]);
		printf("\tlast seen: %d ms ago\n", age);
	}

	if (bss[NL80211_BSS_INFORMATION_ELEMENTS] && show--) {
		if (bss[NL80211_BSS_BEACON_IES])
			printf("\tInformation elements from Probe Response "
			       "frame:\n");
		print_ies(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
			  nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
			  params->unknown, params->type);
	}
	if (bss[NL80211_BSS_BEACON_IES] && show--) {
		printf("\tInformation elements from Beacon frame:\n");
		print_ies(nla_data(bss[NL80211_BSS_BEACON_IES]),
			  nla_len(bss[NL80211_BSS_BEACON_IES]),
			  params->unknown, params->type);
	}

	return NL_SKIP;
}

static struct scan_params scan_params;

static int handle_scan_dump(struct nl80211_state *state,
			    struct nl_cb *cb,
			    struct nl_msg *msg,
			    int argc, char **argv,
			    enum id_input id)
{
	if (argc > 1)
		return 1;

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

	if (argc == 1 && !strcmp(argv[0], "-u"))
		scan_params.unknown = true;
	else if (argc == 1 && !strcmp(argv[0], "-b"))
		scan_params.show_both_ie_sets = true;

	scan_params.type = PRINT_SCAN;

	nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_bss_handler,
		  &scan_params);
	return 0;
}

static int handle_scan_combined(struct nl80211_state *state,
				struct nl_cb *cb,
				struct nl_msg *msg,
				int argc, char **argv,
				enum id_input id)
{
	char **trig_argv;
	static char *dump_argv[] = {
		NULL,
		"scan",
		"dump",
		NULL,
	};
	static const __u32 cmds[] = {
		NL80211_CMD_NEW_SCAN_RESULTS,
		NL80211_CMD_SCAN_ABORTED,
	};
	int trig_argc, dump_argc, err;

	if (argc >= 3 && !strcmp(argv[2], "-u")) {
		dump_argc = 4;
		dump_argv[3] = "-u";
	} else if (argc >= 3 && !strcmp(argv[2], "-b")) {
		dump_argc = 4;
		dump_argv[3] = "-b";
	} else
		dump_argc = 3;

	trig_argc = 3 + (argc - 2) + (3 - dump_argc);
	trig_argv = calloc(trig_argc, sizeof(*trig_argv));
	if (!trig_argv)
		return -ENOMEM;
	trig_argv[0] = argv[0];
	trig_argv[1] = "scan";
	trig_argv[2] = "trigger";
	int i;
	for (i = 0; i < argc - 2 - (dump_argc - 3); i++)
		trig_argv[i + 3] = argv[i + 2 + (dump_argc - 3)];
	err = handle_cmd(state, id, trig_argc, trig_argv);
	free(trig_argv);
	if (err)
		return err;

	/*
	 * WARNING: DO NOT COPY THIS CODE INTO YOUR APPLICATION
	 *
	 * This code has a bug, which requires creating a separate
	 * nl80211 socket to fix:
	 * It is possible for a NL80211_CMD_NEW_SCAN_RESULTS or
	 * NL80211_CMD_SCAN_ABORTED message to be sent by the kernel
	 * before (!) we listen to it, because we only start listening
	 * after we send our scan request.
	 *
	 * Doing it the other way around has a race condition as well,
	 * if you first open the events socket you may get a notification
	 * for a previous scan.
	 *
	 * The only proper way to fix this would be to listen to events
	 * before sending the command, and for the kernel to send the
	 * scan request along with the event, so that you can match up
	 * whether the scan you requested was finished or aborted (this
	 * may result in processing a scan that another application
	 * requested, but that doesn't seem to be a problem).
	 *
	 * Alas, the kernel doesn't do that (yet).
	 */

	if (listen_events(state, ARRAY_SIZE(cmds), cmds) ==
					NL80211_CMD_SCAN_ABORTED) {
		printf("scan aborted!\n");
		return 0;
	}

	dump_argv[0] = argv[0];
	return handle_cmd(state, id, dump_argc, dump_argv);
}
TOPLEVEL(scan, "[-u] [freq <freq>*] [ies <hex as 00:11:..>] [meshid <meshid>] [lowpri,flush,ap-force] [randomise[=<addr>/<mask>]] [ssid <ssid>*|passive]", 0, 0,
	 CIB_NETDEV, handle_scan_combined,
	 "Scan on the given frequencies and probe for the given SSIDs\n"
	 "(or wildcard if not given) unless passive scanning is requested.\n"
	 "If -u is specified print unknown data in the scan results.\n"
	 "Specified (vendor) IEs must be well-formed.");
COMMAND(scan, dump, "[-u]",
	NL80211_CMD_GET_SCAN, NLM_F_DUMP, CIB_NETDEV, handle_scan_dump,
	"Dump the current scan results. If -u is specified, print unknown\n"
	"data in scan results.");
COMMAND(scan, trigger, "[freq <freq>*] [ies <hex as 00:11:..>] [meshid <meshid>] [lowpri,flush,ap-force] [randomise[=<addr>/<mask>]] [ssid <ssid>*|passive]",
	NL80211_CMD_TRIGGER_SCAN, 0, CIB_NETDEV, handle_scan,
	 "Trigger a scan on the given frequencies with probing for the given\n"
	 "SSIDs (or wildcard if not given) unless passive scanning is requested.");


static int handle_start_sched_scan(struct nl80211_state *state,
				   struct nl_cb *cb, struct nl_msg *msg,
				   int argc, char **argv, enum id_input id)
{
	return parse_sched_scan(msg, &argc, &argv);
}

static int handle_stop_sched_scan(struct nl80211_state *state, struct nl_cb *cb,
				  struct nl_msg *msg, int argc, char **argv,
				  enum id_input id)
{
	if (argc != 0)
		return 1;

	return 0;
}

COMMAND(scan, sched_start,
	SCHED_SCAN_OPTIONS,
	NL80211_CMD_START_SCHED_SCAN, 0, CIB_NETDEV, handle_start_sched_scan,
	"Start a scheduled scan at the specified interval on the given frequencies\n"
	"with probing for the given SSIDs (or wildcard if not given) unless passive\n"
	"scanning is requested.  If matches are specified, only matching results\n"
	"will be returned.");
COMMAND(scan, sched_stop, "",
	NL80211_CMD_STOP_SCHED_SCAN, 0, CIB_NETDEV, handle_stop_sched_scan,
	"Stop an ongoing scheduled scan.");