src/common/ieee802_11_common.c - vendor/opensource/hostap - Git at Google

 /*
  * IEEE 802.11 Common routines
  * Copyright (c) 2002-2015, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
  */

 #include "includes.h"

 #include "common.h"
 #include "defs.h"
 #include "wpa_common.h"
 #include "ieee802_11_defs.h"
 #include "ieee802_11_common.h"


 static int ieee802_11_parse_vendor_specific(const u8 *pos, size_t elen,
 					    struct ieee802_11_elems *elems,
 					    int show_errors)
 {
 	unsigned int oui;

 	/* first 3 bytes in vendor specific information element are the IEEE
 	 * OUI of the vendor. The following byte is used a vendor specific
 	 * sub-type. */
 	if (elen < 4) {
 		if (show_errors) {
 			wpa_printf(MSG_MSGDUMP, "short vendor specific "
 				   "information element ignored (len=%lu)",
 				   (unsigned long) elen);
 		}
 		return -1;
 	}

 	oui = WPA_GET_BE24(pos);
 	switch (oui) {
 	case OUI_MICROSOFT:
 		/* Microsoft/Wi-Fi information elements are further typed and
 		 * subtyped */
 		switch (pos[3]) {
 		case 1:
 			/* Microsoft OUI (00:50:F2) with OUI Type 1:
 			 * real WPA information element */
 			elems->wpa_ie = pos;
 			elems->wpa_ie_len = elen;
 			break;
 		case WMM_OUI_TYPE:
 			/* WMM information element */
 			if (elen < 5) {
 				wpa_printf(MSG_MSGDUMP, "short WMM "
 					   "information element ignored "
 					   "(len=%lu)",
 					   (unsigned long) elen);
 				return -1;
 			}
 			switch (pos[4]) {
 			case WMM_OUI_SUBTYPE_INFORMATION_ELEMENT:
 			case WMM_OUI_SUBTYPE_PARAMETER_ELEMENT:
 				/*
 				 * Share same pointer since only one of these
 				 * is used and they start with same data.
 				 * Length field can be used to distinguish the
 				 * IEs.
 				 */
 				elems->wmm = pos;
 				elems->wmm_len = elen;
 				break;
 			case WMM_OUI_SUBTYPE_TSPEC_ELEMENT:
 				elems->wmm_tspec = pos;
 				elems->wmm_tspec_len = elen;
 				break;
 			default:
 				wpa_printf(MSG_EXCESSIVE, "unknown WMM "
 					   "information element ignored "
 					   "(subtype=%d len=%lu)",
 					   pos[4], (unsigned long) elen);
 				return -1;
 			}
 			break;
 		case 4:
 			/* Wi-Fi Protected Setup (WPS) IE */
 			elems->wps_ie = pos;
 			elems->wps_ie_len = elen;
 			break;
 		default:
 			wpa_printf(MSG_EXCESSIVE, "Unknown Microsoft "
 				   "information element ignored "
 				   "(type=%d len=%lu)",
 				   pos[3], (unsigned long) elen);
 			return -1;
 		}
 		break;

 	case OUI_WFA:
 		switch (pos[3]) {
 		case P2P_OUI_TYPE:
 			/* Wi-Fi Alliance - P2P IE */
 			elems->p2p = pos;
 			elems->p2p_len = elen;
 			break;
 		case WFD_OUI_TYPE:
 			/* Wi-Fi Alliance - WFD IE */
 			elems->wfd = pos;
 			elems->wfd_len = elen;
 			break;
 		case HS20_INDICATION_OUI_TYPE:
 			/* Hotspot 2.0 */
 			elems->hs20 = pos;
 			elems->hs20_len = elen;
 			break;
 		case HS20_OSEN_OUI_TYPE:
 			/* Hotspot 2.0 OSEN */
 			elems->osen = pos;
 			elems->osen_len = elen;
 			break;
 		default:
 			wpa_printf(MSG_MSGDUMP, "Unknown WFA "
 				   "information element ignored "
 				   "(type=%d len=%lu)",
 				   pos[3], (unsigned long) elen);
 			return -1;
 		}
 		break;

 	case OUI_BROADCOM:
 		switch (pos[3]) {
 		case VENDOR_HT_CAPAB_OUI_TYPE:
 			elems->vendor_ht_cap = pos;
 			elems->vendor_ht_cap_len = elen;
 			break;
 		case VENDOR_VHT_TYPE:
 			if (elen > 4 &&
 			    (pos[4] == VENDOR_VHT_SUBTYPE ||
 			     pos[4] == VENDOR_VHT_SUBTYPE2)) {
 				elems->vendor_vht = pos;
 				elems->vendor_vht_len = elen;
 			} else
 				return -1;
 			break;
 		default:
 			wpa_printf(MSG_EXCESSIVE, "Unknown Broadcom "
 				   "information element ignored "
 				   "(type=%d len=%lu)",
 				   pos[3], (unsigned long) elen);
 			return -1;
 		}
 		break;

 	default:
 		wpa_printf(MSG_EXCESSIVE, "unknown vendor specific "
 			   "information element ignored (vendor OUI "
 			   "%02x:%02x:%02x len=%lu)",
 			   pos[0], pos[1], pos[2], (unsigned long) elen);
 		return -1;
 	}

 	return 0;
 }


 /**
  * ieee802_11_parse_elems - Parse information elements in management frames
  * @start: Pointer to the start of IEs
  * @len: Length of IE buffer in octets
  * @elems: Data structure for parsed elements
  * @show_errors: Whether to show parsing errors in debug log
  * Returns: Parsing result
  */
 ParseRes ieee802_11_parse_elems(const u8 *start, size_t len,
 				struct ieee802_11_elems *elems,
 				int show_errors)
 {
 	size_t left = len;
 	const u8 *pos = start;
 	int unknown = 0;

 	os_memset(elems, 0, sizeof(*elems));

 	while (left >= 2) {
 		u8 id, elen;

 		id = *pos++;
 		elen = *pos++;
 		left -= 2;

 		if (elen > left) {
 			if (show_errors) {
 				wpa_printf(MSG_DEBUG, "IEEE 802.11 element "
 					   "parse failed (id=%d elen=%d "
 					   "left=%lu)",
 					   id, elen, (unsigned long) left);
 				wpa_hexdump(MSG_MSGDUMP, "IEs", start, len);
 			}
 			return ParseFailed;
 		}

 		switch (id) {
 		case WLAN_EID_SSID:
 			if (elen > SSID_MAX_LEN) {
 				wpa_printf(MSG_DEBUG,
 					   "Ignored too long SSID element (elen=%u)",
 					   elen);
 				break;
 			}
 			elems->ssid = pos;
 			elems->ssid_len = elen;
 			break;
 		case WLAN_EID_SUPP_RATES:
 			elems->supp_rates = pos;
 			elems->supp_rates_len = elen;
 			break;
 		case WLAN_EID_DS_PARAMS:
 			if (elen < 1)
 				break;
 			elems->ds_params = pos;
 			break;
 		case WLAN_EID_CF_PARAMS:
 		case WLAN_EID_TIM:
 			break;
 		case WLAN_EID_CHALLENGE:
 			elems->challenge = pos;
 			elems->challenge_len = elen;
 			break;
 		case WLAN_EID_ERP_INFO:
 			elems->erp_info = pos;
 			elems->erp_info_len = elen;
 			break;
 		case WLAN_EID_EXT_SUPP_RATES:
 			elems->ext_supp_rates = pos;
 			elems->ext_supp_rates_len = elen;
 			break;
 		case WLAN_EID_VENDOR_SPECIFIC:
 			if (ieee802_11_parse_vendor_specific(pos, elen,
 							     elems,
 							     show_errors))
 				unknown++;
 			break;
 		case WLAN_EID_RSN:
 			elems->rsn_ie = pos;
 			elems->rsn_ie_len = elen;
 			break;
 		case WLAN_EID_PWR_CAPABILITY:
 			break;
 		case WLAN_EID_SUPPORTED_CHANNELS:
 			elems->supp_channels = pos;
 			elems->supp_channels_len = elen;
 			break;
 		case WLAN_EID_MOBILITY_DOMAIN:
 			if (elen < sizeof(struct rsn_mdie))
 				break;
 			elems->mdie = pos;
 			elems->mdie_len = elen;
 			break;
 		case WLAN_EID_FAST_BSS_TRANSITION:
 			if (elen < sizeof(struct rsn_ftie))
 				break;
 			elems->ftie = pos;
 			elems->ftie_len = elen;
 			break;
 		case WLAN_EID_TIMEOUT_INTERVAL:
 			if (elen != 5)
 				break;
 			elems->timeout_int = pos;
 			elems->timeout_int_len = elen;
 			break;
 		case WLAN_EID_HT_CAP:
 			elems->ht_capabilities = pos;
 			elems->ht_capabilities_len = elen;
 			break;
 		case WLAN_EID_HT_OPERATION:
 			elems->ht_operation = pos;
 			elems->ht_operation_len = elen;
 			break;
 		case WLAN_EID_MESH_CONFIG:
 			elems->mesh_config = pos;
 			elems->mesh_config_len = elen;
 			break;
 		case WLAN_EID_MESH_ID:
 			elems->mesh_id = pos;
 			elems->mesh_id_len = elen;
 			break;
 		case WLAN_EID_PEER_MGMT:
 			elems->peer_mgmt = pos;
 			elems->peer_mgmt_len = elen;
 			break;
 		case WLAN_EID_VHT_CAP:
 			elems->vht_capabilities = pos;
 			elems->vht_capabilities_len = elen;
 			break;
 		case WLAN_EID_VHT_OPERATION:
 			elems->vht_operation = pos;
 			elems->vht_operation_len = elen;
 			break;
 		case WLAN_EID_VHT_OPERATING_MODE_NOTIFICATION:
 			if (elen != 1)
 				break;
 			elems->vht_opmode_notif = pos;
 			break;
 		case WLAN_EID_LINK_ID:
 			if (elen < 18)
 				break;
 			elems->link_id = pos;
 			break;
 		case WLAN_EID_INTERWORKING:
 			elems->interworking = pos;
 			elems->interworking_len = elen;
 			break;
 		case WLAN_EID_QOS_MAP_SET:
 			if (elen < 16)
 				break;
 			elems->qos_map_set = pos;
 			elems->qos_map_set_len = elen;
 			break;
 		case WLAN_EID_EXT_CAPAB:
 			elems->ext_capab = pos;
 			elems->ext_capab_len = elen;
 			break;
 		case WLAN_EID_BSS_MAX_IDLE_PERIOD:
 			if (elen < 3)
 				break;
 			elems->bss_max_idle_period = pos;
 			break;
 		case WLAN_EID_SSID_LIST:
 			elems->ssid_list = pos;
 			elems->ssid_list_len = elen;
 			break;
 		case WLAN_EID_AMPE:
 			elems->ampe = pos;
 			elems->ampe_len = elen;
 			break;
 		case WLAN_EID_MIC:
 			elems->mic = pos;
 			elems->mic_len = elen;
 			/* after mic everything is encrypted, so stop. */
 			left = elen;
 			break;
 		default:
 			unknown++;
 			if (!show_errors)
 				break;
 			wpa_printf(MSG_MSGDUMP, "IEEE 802.11 element parse "
 				   "ignored unknown element (id=%d elen=%d)",
 				   id, elen);
 			break;
 		}

 		left -= elen;
 		pos += elen;
 	}

 	if (left)
 		return ParseFailed;

 	return unknown ? ParseUnknown : ParseOK;
 }


 int ieee802_11_ie_count(const u8 *ies, size_t ies_len)
 {
 	int count = 0;
 	const u8 *pos, *end;

 	if (ies == NULL)
 		return 0;

 	pos = ies;
 	end = ies + ies_len;

 	while (pos + 2 <= end) {
 		if (pos + 2 + pos[1] > end)
 			break;
 		count++;
 		pos += 2 + pos[1];
 	}

 	return count;
 }


 struct wpabuf * ieee802_11_vendor_ie_concat(const u8 *ies, size_t ies_len,
 					    u32 oui_type)
 {
 	struct wpabuf *buf;
 	const u8 *end, *pos, *ie;

 	pos = ies;
 	end = ies + ies_len;
 	ie = NULL;

 	while (pos + 1 < end) {
 		if (pos + 2 + pos[1] > end)
 			return NULL;
 		if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
 		    WPA_GET_BE32(&pos[2]) == oui_type) {
 			ie = pos;
 			break;
 		}
 		pos += 2 + pos[1];
 	}

 	if (ie == NULL)
 		return NULL; /* No specified vendor IE found */

 	buf = wpabuf_alloc(ies_len);
 	if (buf == NULL)
 		return NULL;

 	/*
 	 * There may be multiple vendor IEs in the message, so need to
 	 * concatenate their data fields.
 	 */
 	while (pos + 1 < end) {
 		if (pos + 2 + pos[1] > end)
 			break;
 		if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
 		    WPA_GET_BE32(&pos[2]) == oui_type)
 			wpabuf_put_data(buf, pos + 6, pos[1] - 4);
 		pos += 2 + pos[1];
 	}

 	return buf;
 }


 const u8 * get_hdr_bssid(const struct ieee80211_hdr *hdr, size_t len)
 {
 	u16 fc, type, stype;

 	/*
 	 * PS-Poll frames are 16 bytes. All other frames are
 	 * 24 bytes or longer.
 	 */
 	if (len < 16)
 		return NULL;

 	fc = le_to_host16(hdr->frame_control);
 	type = WLAN_FC_GET_TYPE(fc);
 	stype = WLAN_FC_GET_STYPE(fc);

 	switch (type) {
 	case WLAN_FC_TYPE_DATA:
 		if (len < 24)
 			return NULL;
 		switch (fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) {
 		case WLAN_FC_FROMDS | WLAN_FC_TODS:
 		case WLAN_FC_TODS:
 			return hdr->addr1;
 		case WLAN_FC_FROMDS:
 			return hdr->addr2;
 		default:
 			return NULL;
 		}
 	case WLAN_FC_TYPE_CTRL:
 		if (stype != WLAN_FC_STYPE_PSPOLL)
 			return NULL;
 		return hdr->addr1;
 	case WLAN_FC_TYPE_MGMT:
 		return hdr->addr3;
 	default:
 		return NULL;
 	}
 }


 int hostapd_config_wmm_ac(struct hostapd_wmm_ac_params wmm_ac_params[],
 			  const char *name, const char *val)
 {
 	int num, v;
 	const char *pos;
 	struct hostapd_wmm_ac_params *ac;

 	/* skip 'wme_ac_' or 'wmm_ac_' prefix */
 	pos = name + 7;
 	if (os_strncmp(pos, "be_", 3) == 0) {
 		num = 0;
 		pos += 3;
 	} else if (os_strncmp(pos, "bk_", 3) == 0) {
 		num = 1;
 		pos += 3;
 	} else if (os_strncmp(pos, "vi_", 3) == 0) {
 		num = 2;
 		pos += 3;
 	} else if (os_strncmp(pos, "vo_", 3) == 0) {
 		num = 3;
 		pos += 3;
 	} else {
 		wpa_printf(MSG_ERROR, "Unknown WMM name '%s'", pos);
 		return -1;
 	}

 	ac = &wmm_ac_params[num];

 	if (os_strcmp(pos, "aifs") == 0) {
 		v = atoi(val);
 		if (v < 1 || v > 255) {
 			wpa_printf(MSG_ERROR, "Invalid AIFS value %d", v);
 			return -1;
 		}
 		ac->aifs = v;
 	} else if (os_strcmp(pos, "cwmin") == 0) {
 		v = atoi(val);
 		if (v < 0 || v > 12) {
 			wpa_printf(MSG_ERROR, "Invalid cwMin value %d", v);
 			return -1;
 		}
 		ac->cwmin = v;
 	} else if (os_strcmp(pos, "cwmax") == 0) {
 		v = atoi(val);
 		if (v < 0 || v > 12) {
 			wpa_printf(MSG_ERROR, "Invalid cwMax value %d", v);
 			return -1;
 		}
 		ac->cwmax = v;
 	} else if (os_strcmp(pos, "txop_limit") == 0) {
 		v = atoi(val);
 		if (v < 0 || v > 0xffff) {
 			wpa_printf(MSG_ERROR, "Invalid txop value %d", v);
 			return -1;
 		}
 		ac->txop_limit = v;
 	} else if (os_strcmp(pos, "acm") == 0) {
 		v = atoi(val);
 		if (v < 0 || v > 1) {
 			wpa_printf(MSG_ERROR, "Invalid acm value %d", v);
 			return -1;
 		}
 		ac->admission_control_mandatory = v;
 	} else {
 		wpa_printf(MSG_ERROR, "Unknown wmm_ac_ field '%s'", pos);
 		return -1;
 	}

 	return 0;
 }


 enum hostapd_hw_mode ieee80211_freq_to_chan(int freq, u8 *channel)
 {
 	enum hostapd_hw_mode mode = NUM_HOSTAPD_MODES;

 	if (freq >= 2412 && freq <= 2472) {
 		mode = HOSTAPD_MODE_IEEE80211G;
 		*channel = (freq - 2407) / 5;
 	} else if (freq == 2484) {
 		mode = HOSTAPD_MODE_IEEE80211B;
 		*channel = 14;
 	} else if (freq >= 4900 && freq < 5000) {
 		mode = HOSTAPD_MODE_IEEE80211A;
 		*channel = (freq - 4000) / 5;
 	} else if (freq >= 5000 && freq < 5900) {
 		mode = HOSTAPD_MODE_IEEE80211A;
 		*channel = (freq - 5000) / 5;
 	} else if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
 		mode = HOSTAPD_MODE_IEEE80211AD;
 		*channel = (freq - 56160) / 2160;
 	}

 	return mode;
 }


 static const char *us_op_class_cc[] = {
 	"US", "CA", NULL
 };

 static const char *eu_op_class_cc[] = {
 	"AL", "AM", "AT", "AZ", "BA", "BE", "BG", "BY", "CH", "CY", "CZ", "DE",
 	"DK", "EE", "EL", "ES", "FI", "FR", "GE", "HR", "HU", "IE", "IS", "IT",
 	"LI", "LT", "LU", "LV", "MD", "ME", "MK", "MT", "NL", "NO", "PL", "PT",
 	"RO", "RS", "RU", "SE", "SI", "SK", "TR", "UA", "UK", NULL
 };

 static const char *jp_op_class_cc[] = {
 	"JP", NULL
 };

 static const char *cn_op_class_cc[] = {
 	"CN", "CA", NULL
 };


 static int country_match(const char *cc[], const char *country)
 {
 	int i;

 	if (country == NULL)
 		return 0;
 	for (i = 0; cc[i]; i++) {
 		if (cc[i][0] == country[0] && cc[i][1] == country[1])
 			return 1;
 	}

 	return 0;
 }


 static int ieee80211_chan_to_freq_us(u8 op_class, u8 chan)
 {
 	switch (op_class) {
 	case 12: /* channels 1..11 */
 	case 32: /* channels 1..7; 40 MHz */
 	case 33: /* channels 5..11; 40 MHz */
 		if (chan < 1 || chan > 11)
 			return -1;
 		return 2407 + 5 * chan;
 	case 1: /* channels 36,40,44,48 */
 	case 2: /* channels 52,56,60,64; dfs */
 	case 22: /* channels 36,44; 40 MHz */
 	case 23: /* channels 52,60; 40 MHz */
 	case 27: /* channels 40,48; 40 MHz */
 	case 28: /* channels 56,64; 40 MHz */
 		if (chan < 36 || chan > 64)
 			return -1;
 		return 5000 + 5 * chan;
 	case 4: /* channels 100-144 */
 	case 24: /* channels 100-140; 40 MHz */
 		if (chan < 100 || chan > 144)
 			return -1;
 		return 5000 + 5 * chan;
 	case 3: /* channels 149,153,157,161 */
 	case 25: /* channels 149,157; 40 MHz */
 	case 26: /* channels 149,157; 40 MHz */
 	case 30: /* channels 153,161; 40 MHz */
 	case 31: /* channels 153,161; 40 MHz */
 		if (chan < 149 || chan > 161)
 			return -1;
 		return 5000 + 5 * chan;
 	case 34: /* 60 GHz band, channels 1..3 */
 		if (chan < 1 || chan > 3)
 			return -1;
 		return 56160 + 2160 * chan;
 	}
 	return -1;
 }


 static int ieee80211_chan_to_freq_eu(u8 op_class, u8 chan)
 {
 	switch (op_class) {
 	case 4: /* channels 1..13 */
 	case 11: /* channels 1..9; 40 MHz */
 	case 12: /* channels 5..13; 40 MHz */
 		if (chan < 1 || chan > 13)
 			return -1;
 		return 2407 + 5 * chan;
 	case 1: /* channels 36,40,44,48 */
 	case 2: /* channels 52,56,60,64; dfs */
 	case 5: /* channels 36,44; 40 MHz */
 	case 6: /* channels 52,60; 40 MHz */
 	case 8: /* channels 40,48; 40 MHz */
 	case 9: /* channels 56,64; 40 MHz */
 		if (chan < 36 || chan > 64)
 			return -1;
 		return 5000 + 5 * chan;
 	case 3: /* channels 100-140 */
 	case 7: /* channels 100-132; 40 MHz */
 	case 10: /* channels 104-136; 40 MHz */
 	case 16: /* channels 100-140 */
 		if (chan < 100 || chan > 140)
 			return -1;
 		return 5000 + 5 * chan;
 	case 17: /* channels 149,153,157,161,165,169 */
 		if (chan < 149 || chan > 169)
 			return -1;
 		return 5000 + 5 * chan;
 	case 18: /* 60 GHz band, channels 1..4 */
 		if (chan < 1 || chan > 4)
 			return -1;
 		return 56160 + 2160 * chan;
 	}
 	return -1;
 }


 static int ieee80211_chan_to_freq_jp(u8 op_class, u8 chan)
 {
 	switch (op_class) {
 	case 30: /* channels 1..13 */
 	case 56: /* channels 1..9; 40 MHz */
 	case 57: /* channels 5..13; 40 MHz */
 		if (chan < 1 || chan > 13)
 			return -1;
 		return 2407 + 5 * chan;
 	case 31: /* channel 14 */
 		if (chan != 14)
 			return -1;
 		return 2414 + 5 * chan;
 	case 1: /* channels 34,38,42,46(old) or 36,40,44,48 */
 	case 32: /* channels 52,56,60,64 */
 	case 33: /* channels 52,56,60,64 */
 	case 36: /* channels 36,44; 40 MHz */
 	case 37: /* channels 52,60; 40 MHz */
 	case 38: /* channels 52,60; 40 MHz */
 	case 41: /* channels 40,48; 40 MHz */
 	case 42: /* channels 56,64; 40 MHz */
 	case 43: /* channels 56,64; 40 MHz */
 		if (chan < 34 || chan > 64)
 			return -1;
 		return 5000 + 5 * chan;
 	case 34: /* channels 100-140 */
 	case 35: /* channels 100-140 */
 	case 39: /* channels 100-132; 40 MHz */
 	case 40: /* channels 100-132; 40 MHz */
 	case 44: /* channels 104-136; 40 MHz */
 	case 45: /* channels 104-136; 40 MHz */
 	case 58: /* channels 100-140 */
 		if (chan < 100 || chan > 140)
 			return -1;
 		return 5000 + 5 * chan;
 	case 59: /* 60 GHz band, channels 1..4 */
 		if (chan < 1 || chan > 3)
 			return -1;
 		return 56160 + 2160 * chan;
 	}
 	return -1;
 }


 static int ieee80211_chan_to_freq_cn(u8 op_class, u8 chan)
 {
 	switch (op_class) {
 	case 7: /* channels 1..13 */
 	case 8: /* channels 1..9; 40 MHz */
 	case 9: /* channels 5..13; 40 MHz */
 		if (chan < 1 || chan > 13)
 			return -1;
 		return 2407 + 5 * chan;
 	case 1: /* channels 36,40,44,48 */
 	case 2: /* channels 52,56,60,64; dfs */
 	case 4: /* channels 36,44; 40 MHz */
 	case 5: /* channels 52,60; 40 MHz */
 		if (chan < 36 || chan > 64)
 			return -1;
 		return 5000 + 5 * chan;
 	case 3: /* channels 149,153,157,161,165 */
 	case 6: /* channels 149,157; 40 MHz */
 		if (chan < 149 || chan > 165)
 			return -1;
 		return 5000 + 5 * chan;
 	}
 	return -1;
 }


 static int ieee80211_chan_to_freq_global(u8 op_class, u8 chan)
 {
 	/* Table E-4 in IEEE Std 802.11-2012 - Global operating classes */
 	switch (op_class) {
 	case 81:
 		/* channels 1..13 */
 		if (chan < 1 || chan > 13)
 			return -1;
 		return 2407 + 5 * chan;
 	case 82:
 		/* channel 14 */
 		if (chan != 14)
 			return -1;
 		return 2414 + 5 * chan;
 	case 83: /* channels 1..9; 40 MHz */
 	case 84: /* channels 5..13; 40 MHz */
 		if (chan < 1 || chan > 13)
 			return -1;
 		return 2407 + 5 * chan;
 	case 115: /* channels 36,40,44,48; indoor only */
 	case 116: /* channels 36,44; 40 MHz; indoor only */
 	case 117: /* channels 40,48; 40 MHz; indoor only */
 	case 118: /* channels 52,56,60,64; dfs */
 	case 119: /* channels 52,60; 40 MHz; dfs */
 	case 120: /* channels 56,64; 40 MHz; dfs */
 		if (chan < 36 || chan > 64)
 			return -1;
 		return 5000 + 5 * chan;
 	case 121: /* channels 100-140 */
 	case 122: /* channels 100-142; 40 MHz */
 	case 123: /* channels 104-136; 40 MHz */
 		if (chan < 100 || chan > 140)
 			return -1;
 		return 5000 + 5 * chan;
 	case 124: /* channels 149,153,157,161 */
 	case 125: /* channels 149,153,157,161,165,169 */
 	case 126: /* channels 149,157; 40 MHz */
 	case 127: /* channels 153,161; 40 MHz */
 		if (chan < 149 || chan > 161)
 			return -1;
 		return 5000 + 5 * chan;
 	case 128: /* center freqs 42, 58, 106, 122, 138, 155; 80 MHz */
 	case 130: /* center freqs 42, 58, 106, 122, 138, 155; 80 MHz */
 		if (chan < 36 || chan > 161)
 			return -1;
 		return 5000 + 5 * chan;
 	case 129: /* center freqs 50, 114; 160 MHz */
 		if (chan < 50 || chan > 114)
 			return -1;
 		return 5000 + 5 * chan;
 	case 180: /* 60 GHz band, channels 1..4 */
 		if (chan < 1 || chan > 4)
 			return -1;
 		return 56160 + 2160 * chan;
 	}
 	return -1;
 }

 /**
  * ieee80211_chan_to_freq - Convert channel info to frequency
  * @country: Country code, if known; otherwise, global operating class is used
  * @op_class: Operating class
  * @chan: Channel number
  * Returns: Frequency in MHz or -1 if the specified channel is unknown
  */
 int ieee80211_chan_to_freq(const char *country, u8 op_class, u8 chan)
 {
 	int freq;

 	if (country_match(us_op_class_cc, country)) {
 		freq = ieee80211_chan_to_freq_us(op_class, chan);
 		if (freq > 0)
 			return freq;
 	}

 	if (country_match(eu_op_class_cc, country)) {
 		freq = ieee80211_chan_to_freq_eu(op_class, chan);
 		if (freq > 0)
 			return freq;
 	}

 	if (country_match(jp_op_class_cc, country)) {
 		freq = ieee80211_chan_to_freq_jp(op_class, chan);
 		if (freq > 0)
 			return freq;
 	}

 	if (country_match(cn_op_class_cc, country)) {
 		freq = ieee80211_chan_to_freq_cn(op_class, chan);
 		if (freq > 0)
 			return freq;
 	}

 	return ieee80211_chan_to_freq_global(op_class, chan);
 }


 int ieee80211_is_dfs(int freq)
 {
 	/* TODO: this could be more accurate to better cover all domains */
 	return (freq >= 5260 && freq <= 5320) || (freq >= 5500 && freq <= 5700);
 }


 static int is_11b(u8 rate)
 {
 	return rate == 0x02 || rate == 0x04 || rate == 0x0b || rate == 0x16;
 }


 int supp_rates_11b_only(struct ieee802_11_elems *elems)
 {
 	int num_11b = 0, num_others = 0;
 	int i;

 	if (elems->supp_rates == NULL && elems->ext_supp_rates == NULL)
 		return 0;

 	for (i = 0; elems->supp_rates && i < elems->supp_rates_len; i++) {
 		if (is_11b(elems->supp_rates[i]))
 			num_11b++;
 		else
 			num_others++;
 	}

 	for (i = 0; elems->ext_supp_rates && i < elems->ext_supp_rates_len;
 	     i++) {
 		if (is_11b(elems->ext_supp_rates[i]))
 			num_11b++;
 		else
 			num_others++;
 	}

 	return num_11b > 0 && num_others == 0;
 }


 const char * fc2str(u16 fc)
 {
 	u16 stype = WLAN_FC_GET_STYPE(fc);
 #define C2S(x) case x: return #x;

 	switch (WLAN_FC_GET_TYPE(fc)) {
 	case WLAN_FC_TYPE_MGMT:
 		switch (stype) {
 		C2S(WLAN_FC_STYPE_ASSOC_REQ)
 		C2S(WLAN_FC_STYPE_ASSOC_RESP)
 		C2S(WLAN_FC_STYPE_REASSOC_REQ)
 		C2S(WLAN_FC_STYPE_REASSOC_RESP)
 		C2S(WLAN_FC_STYPE_PROBE_REQ)
 		C2S(WLAN_FC_STYPE_PROBE_RESP)
 		C2S(WLAN_FC_STYPE_BEACON)
 		C2S(WLAN_FC_STYPE_ATIM)
 		C2S(WLAN_FC_STYPE_DISASSOC)
 		C2S(WLAN_FC_STYPE_AUTH)
 		C2S(WLAN_FC_STYPE_DEAUTH)
 		C2S(WLAN_FC_STYPE_ACTION)
 		}
 		break;
 	case WLAN_FC_TYPE_CTRL:
 		switch (stype) {
 		C2S(WLAN_FC_STYPE_PSPOLL)
 		C2S(WLAN_FC_STYPE_RTS)
 		C2S(WLAN_FC_STYPE_CTS)
 		C2S(WLAN_FC_STYPE_ACK)
 		C2S(WLAN_FC_STYPE_CFEND)
 		C2S(WLAN_FC_STYPE_CFENDACK)
 		}
 		break;
 	case WLAN_FC_TYPE_DATA:
 		switch (stype) {
 		C2S(WLAN_FC_STYPE_DATA)
 		C2S(WLAN_FC_STYPE_DATA_CFACK)
 		C2S(WLAN_FC_STYPE_DATA_CFPOLL)
 		C2S(WLAN_FC_STYPE_DATA_CFACKPOLL)
 		C2S(WLAN_FC_STYPE_NULLFUNC)
 		C2S(WLAN_FC_STYPE_CFACK)
 		C2S(WLAN_FC_STYPE_CFPOLL)
 		C2S(WLAN_FC_STYPE_CFACKPOLL)
 		C2S(WLAN_FC_STYPE_QOS_DATA)
 		C2S(WLAN_FC_STYPE_QOS_DATA_CFACK)
 		C2S(WLAN_FC_STYPE_QOS_DATA_CFPOLL)
 		C2S(WLAN_FC_STYPE_QOS_DATA_CFACKPOLL)
 		C2S(WLAN_FC_STYPE_QOS_NULL)
 		C2S(WLAN_FC_STYPE_QOS_CFPOLL)
 		C2S(WLAN_FC_STYPE_QOS_CFACKPOLL)
 		}
 		break;
 	}
 	return "WLAN_FC_TYPE_UNKNOWN";
 #undef C2S
 }
	/*
	* IEEE 802.11 Common routines
	* Copyright (c) 2002-2015, Jouni Malinen <j@w1.fi>
	*
	* This software may be distributed under the terms of the BSD license.
	* See README for more details.
	*/

	#include "includes.h"

	#include "common.h"
	#include "defs.h"
	#include "wpa_common.h"
	#include "ieee802_11_defs.h"
	#include "ieee802_11_common.h"


	static int ieee802_11_parse_vendor_specific(const u8 *pos, size_t elen,
	struct ieee802_11_elems *elems,
	int show_errors)
	{
	unsigned int oui;

	/* first 3 bytes in vendor specific information element are the IEEE
	* OUI of the vendor. The following byte is used a vendor specific
	* sub-type. */
	if (elen < 4) {
	if (show_errors) {
	wpa_printf(MSG_MSGDUMP, "short vendor specific "
	"information element ignored (len=%lu)",
	(unsigned long) elen);
	}
	return -1;
	}

	oui = WPA_GET_BE24(pos);
	switch (oui) {
	case OUI_MICROSOFT:
	/* Microsoft/Wi-Fi information elements are further typed and
	* subtyped */
	switch (pos[3]) {
	case 1:
	/* Microsoft OUI (00:50:F2) with OUI Type 1:
	* real WPA information element */
	elems->wpa_ie = pos;
	elems->wpa_ie_len = elen;
	break;
	case WMM_OUI_TYPE:
	/* WMM information element */
	if (elen < 5) {
	wpa_printf(MSG_MSGDUMP, "short WMM "
	"information element ignored "
	"(len=%lu)",
	(unsigned long) elen);
	return -1;
	}
	switch (pos[4]) {
	case WMM_OUI_SUBTYPE_INFORMATION_ELEMENT:
	case WMM_OUI_SUBTYPE_PARAMETER_ELEMENT:
	/*
	* Share same pointer since only one of these
	* is used and they start with same data.
	* Length field can be used to distinguish the
	* IEs.
	*/
	elems->wmm = pos;
	elems->wmm_len = elen;
	break;
	case WMM_OUI_SUBTYPE_TSPEC_ELEMENT:
	elems->wmm_tspec = pos;
	elems->wmm_tspec_len = elen;
	break;
	default:
	wpa_printf(MSG_EXCESSIVE, "unknown WMM "
	"information element ignored "
	"(subtype=%d len=%lu)",
	pos[4], (unsigned long) elen);
	return -1;
	}
	break;
	case 4:
	/* Wi-Fi Protected Setup (WPS) IE */
	elems->wps_ie = pos;
	elems->wps_ie_len = elen;
	break;
	default:
	wpa_printf(MSG_EXCESSIVE, "Unknown Microsoft "
	"information element ignored "
	"(type=%d len=%lu)",
	pos[3], (unsigned long) elen);
	return -1;
	}
	break;

	case OUI_WFA:
	switch (pos[3]) {
	case P2P_OUI_TYPE:
	/* Wi-Fi Alliance - P2P IE */
	elems->p2p = pos;
	elems->p2p_len = elen;
	break;
	case WFD_OUI_TYPE:
	/* Wi-Fi Alliance - WFD IE */
	elems->wfd = pos;
	elems->wfd_len = elen;
	break;
	case HS20_INDICATION_OUI_TYPE:
	/* Hotspot 2.0 */
	elems->hs20 = pos;
	elems->hs20_len = elen;
	break;
	case HS20_OSEN_OUI_TYPE:
	/* Hotspot 2.0 OSEN */
	elems->osen = pos;
	elems->osen_len = elen;
	break;
	default:
	wpa_printf(MSG_MSGDUMP, "Unknown WFA "
	"information element ignored "
	"(type=%d len=%lu)",
	pos[3], (unsigned long) elen);
	return -1;
	}
	break;

	case OUI_BROADCOM:
	switch (pos[3]) {
	case VENDOR_HT_CAPAB_OUI_TYPE:
	elems->vendor_ht_cap = pos;
	elems->vendor_ht_cap_len = elen;
	break;
	case VENDOR_VHT_TYPE:
	if (elen > 4 &&
	(pos[4] == VENDOR_VHT_SUBTYPE \|\|
	pos[4] == VENDOR_VHT_SUBTYPE2)) {
	elems->vendor_vht = pos;
	elems->vendor_vht_len = elen;
	} else
	return -1;
	break;
	default:
	wpa_printf(MSG_EXCESSIVE, "Unknown Broadcom "
	"information element ignored "
	"(type=%d len=%lu)",
	pos[3], (unsigned long) elen);
	return -1;
	}
	break;

	default:
	wpa_printf(MSG_EXCESSIVE, "unknown vendor specific "
	"information element ignored (vendor OUI "
	"%02x:%02x:%02x len=%lu)",
	pos[0], pos[1], pos[2], (unsigned long) elen);
	return -1;
	}

	return 0;
	}


	/**
	* ieee802_11_parse_elems - Parse information elements in management frames
	* @start: Pointer to the start of IEs
	* @len: Length of IE buffer in octets
	* @elems: Data structure for parsed elements
	* @show_errors: Whether to show parsing errors in debug log
	* Returns: Parsing result
	*/
	ParseRes ieee802_11_parse_elems(const u8 *start, size_t len,
	struct ieee802_11_elems *elems,
	int show_errors)
	{
	size_t left = len;
	const u8 *pos = start;
	int unknown = 0;

	os_memset(elems, 0, sizeof(*elems));

	while (left >= 2) {
	u8 id, elen;

	id = *pos++;
	elen = *pos++;
	left -= 2;

	if (elen > left) {
	if (show_errors) {
	wpa_printf(MSG_DEBUG, "IEEE 802.11 element "
	"parse failed (id=%d elen=%d "
	"left=%lu)",
	id, elen, (unsigned long) left);
	wpa_hexdump(MSG_MSGDUMP, "IEs", start, len);
	}
	return ParseFailed;
	}

	switch (id) {
	case WLAN_EID_SSID:
	if (elen > SSID_MAX_LEN) {
	wpa_printf(MSG_DEBUG,
	"Ignored too long SSID element (elen=%u)",
	elen);
	break;
	}
	elems->ssid = pos;
	elems->ssid_len = elen;
	break;
	case WLAN_EID_SUPP_RATES:
	elems->supp_rates = pos;
	elems->supp_rates_len = elen;
	break;
	case WLAN_EID_DS_PARAMS:
	if (elen < 1)
	break;
	elems->ds_params = pos;
	break;
	case WLAN_EID_CF_PARAMS:
	case WLAN_EID_TIM:
	break;
	case WLAN_EID_CHALLENGE:
	elems->challenge = pos;
	elems->challenge_len = elen;
	break;
	case WLAN_EID_ERP_INFO:
	elems->erp_info = pos;
	elems->erp_info_len = elen;
	break;
	case WLAN_EID_EXT_SUPP_RATES:
	elems->ext_supp_rates = pos;
	elems->ext_supp_rates_len = elen;
	break;
	case WLAN_EID_VENDOR_SPECIFIC:
	if (ieee802_11_parse_vendor_specific(pos, elen,
	elems,
	show_errors))
	unknown++;
	break;
	case WLAN_EID_RSN:
	elems->rsn_ie = pos;
	elems->rsn_ie_len = elen;
	break;
	case WLAN_EID_PWR_CAPABILITY:
	break;
	case WLAN_EID_SUPPORTED_CHANNELS:
	elems->supp_channels = pos;
	elems->supp_channels_len = elen;
	break;
	case WLAN_EID_MOBILITY_DOMAIN:
	if (elen < sizeof(struct rsn_mdie))
	break;
	elems->mdie = pos;
	elems->mdie_len = elen;
	break;
	case WLAN_EID_FAST_BSS_TRANSITION:
	if (elen < sizeof(struct rsn_ftie))
	break;
	elems->ftie = pos;
	elems->ftie_len = elen;
	break;
	case WLAN_EID_TIMEOUT_INTERVAL:
	if (elen != 5)
	break;
	elems->timeout_int = pos;
	elems->timeout_int_len = elen;
	break;
	case WLAN_EID_HT_CAP:
	elems->ht_capabilities = pos;
	elems->ht_capabilities_len = elen;
	break;
	case WLAN_EID_HT_OPERATION:
	elems->ht_operation = pos;
	elems->ht_operation_len = elen;
	break;
	case WLAN_EID_MESH_CONFIG:
	elems->mesh_config = pos;
	elems->mesh_config_len = elen;
	break;
	case WLAN_EID_MESH_ID:
	elems->mesh_id = pos;
	elems->mesh_id_len = elen;
	break;
	case WLAN_EID_PEER_MGMT:
	elems->peer_mgmt = pos;
	elems->peer_mgmt_len = elen;
	break;
	case WLAN_EID_VHT_CAP:
	elems->vht_capabilities = pos;
	elems->vht_capabilities_len = elen;
	break;
	case WLAN_EID_VHT_OPERATION:
	elems->vht_operation = pos;
	elems->vht_operation_len = elen;
	break;
	case WLAN_EID_VHT_OPERATING_MODE_NOTIFICATION:
	if (elen != 1)
	break;
	elems->vht_opmode_notif = pos;
	break;
	case WLAN_EID_LINK_ID:
	if (elen < 18)
	break;
	elems->link_id = pos;
	break;
	case WLAN_EID_INTERWORKING:
	elems->interworking = pos;
	elems->interworking_len = elen;
	break;
	case WLAN_EID_QOS_MAP_SET:
	if (elen < 16)
	break;
	elems->qos_map_set = pos;
	elems->qos_map_set_len = elen;
	break;
	case WLAN_EID_EXT_CAPAB:
	elems->ext_capab = pos;
	elems->ext_capab_len = elen;
	break;
	case WLAN_EID_BSS_MAX_IDLE_PERIOD:
	if (elen < 3)
	break;
	elems->bss_max_idle_period = pos;
	break;
	case WLAN_EID_SSID_LIST:
	elems->ssid_list = pos;
	elems->ssid_list_len = elen;
	break;
	case WLAN_EID_AMPE:
	elems->ampe = pos;
	elems->ampe_len = elen;
	break;
	case WLAN_EID_MIC:
	elems->mic = pos;
	elems->mic_len = elen;
	/* after mic everything is encrypted, so stop. */
	left = elen;
	break;
	default:
	unknown++;
	if (!show_errors)
	break;
	wpa_printf(MSG_MSGDUMP, "IEEE 802.11 element parse "
	"ignored unknown element (id=%d elen=%d)",
	id, elen);
	break;
	}

	left -= elen;
	pos += elen;
	}

	if (left)
	return ParseFailed;

	return unknown ? ParseUnknown : ParseOK;
	}


	int ieee802_11_ie_count(const u8 *ies, size_t ies_len)
	{
	int count = 0;
	const u8 pos, end;

	if (ies == NULL)
	return 0;

	pos = ies;
	end = ies + ies_len;

	while (pos + 2 <= end) {
	if (pos + 2 + pos[1] > end)
	break;
	count++;
	pos += 2 + pos[1];
	}

	return count;
	}


	struct wpabuf * ieee802_11_vendor_ie_concat(const u8 *ies, size_t ies_len,
	u32 oui_type)
	{
	struct wpabuf *buf;
	const u8 end, pos, *ie;

	pos = ies;
	end = ies + ies_len;
	ie = NULL;

	while (pos + 1 < end) {
	if (pos + 2 + pos[1] > end)
	return NULL;
	if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
	WPA_GET_BE32(&pos[2]) == oui_type) {
	ie = pos;
	break;
	}
	pos += 2 + pos[1];
	}

	if (ie == NULL)
	return NULL; /* No specified vendor IE found */

	buf = wpabuf_alloc(ies_len);
	if (buf == NULL)
	return NULL;

	/*
	* There may be multiple vendor IEs in the message, so need to
	* concatenate their data fields.
	*/
	while (pos + 1 < end) {
	if (pos + 2 + pos[1] > end)
	break;
	if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
	WPA_GET_BE32(&pos[2]) == oui_type)
	wpabuf_put_data(buf, pos + 6, pos[1] - 4);
	pos += 2 + pos[1];
	}

	return buf;
	}


	const u8 * get_hdr_bssid(const struct ieee80211_hdr *hdr, size_t len)
	{
	u16 fc, type, stype;

	/*
	* PS-Poll frames are 16 bytes. All other frames are
	* 24 bytes or longer.
	*/
	if (len < 16)
	return NULL;

	fc = le_to_host16(hdr->frame_control);
	type = WLAN_FC_GET_TYPE(fc);
	stype = WLAN_FC_GET_STYPE(fc);

	switch (type) {
	case WLAN_FC_TYPE_DATA:
	if (len < 24)
	return NULL;
	switch (fc & (WLAN_FC_FROMDS \| WLAN_FC_TODS)) {
	case WLAN_FC_FROMDS \| WLAN_FC_TODS:
	case WLAN_FC_TODS:
	return hdr->addr1;
	case WLAN_FC_FROMDS:
	return hdr->addr2;
	default:
	return NULL;
	}
	case WLAN_FC_TYPE_CTRL:
	if (stype != WLAN_FC_STYPE_PSPOLL)
	return NULL;
	return hdr->addr1;
	case WLAN_FC_TYPE_MGMT:
	return hdr->addr3;
	default:
	return NULL;
	}
	}


	int hostapd_config_wmm_ac(struct hostapd_wmm_ac_params wmm_ac_params[],
	const char name, const char val)
	{
	int num, v;
	const char *pos;
	struct hostapd_wmm_ac_params *ac;

	/* skip 'wme_ac_' or 'wmm_ac_' prefix */
	pos = name + 7;
	if (os_strncmp(pos, "be_", 3) == 0) {
	num = 0;
	pos += 3;
	} else if (os_strncmp(pos, "bk_", 3) == 0) {
	num = 1;
	pos += 3;
	} else if (os_strncmp(pos, "vi_", 3) == 0) {
	num = 2;
	pos += 3;
	} else if (os_strncmp(pos, "vo_", 3) == 0) {
	num = 3;
	pos += 3;
	} else {
	wpa_printf(MSG_ERROR, "Unknown WMM name '%s'", pos);
	return -1;
	}

	ac = &wmm_ac_params[num];

	if (os_strcmp(pos, "aifs") == 0) {
	v = atoi(val);
	if (v < 1 \|\| v > 255) {
	wpa_printf(MSG_ERROR, "Invalid AIFS value %d", v);
	return -1;
	}
	ac->aifs = v;
	} else if (os_strcmp(pos, "cwmin") == 0) {
	v = atoi(val);
	if (v < 0 \|\| v > 12) {
	wpa_printf(MSG_ERROR, "Invalid cwMin value %d", v);
	return -1;
	}
	ac->cwmin = v;
	} else if (os_strcmp(pos, "cwmax") == 0) {
	v = atoi(val);
	if (v < 0 \|\| v > 12) {
	wpa_printf(MSG_ERROR, "Invalid cwMax value %d", v);
	return -1;
	}
	ac->cwmax = v;
	} else if (os_strcmp(pos, "txop_limit") == 0) {
	v = atoi(val);
	if (v < 0 \|\| v > 0xffff) {
	wpa_printf(MSG_ERROR, "Invalid txop value %d", v);
	return -1;
	}
	ac->txop_limit = v;
	} else if (os_strcmp(pos, "acm") == 0) {
	v = atoi(val);
	if (v < 0 \|\| v > 1) {
	wpa_printf(MSG_ERROR, "Invalid acm value %d", v);
	return -1;
	}
	ac->admission_control_mandatory = v;
	} else {
	wpa_printf(MSG_ERROR, "Unknown wmm_ac_ field '%s'", pos);
	return -1;
	}

	return 0;
	}


	enum hostapd_hw_mode ieee80211_freq_to_chan(int freq, u8 *channel)
	{
	enum hostapd_hw_mode mode = NUM_HOSTAPD_MODES;

	if (freq >= 2412 && freq <= 2472) {
	mode = HOSTAPD_MODE_IEEE80211G;
	*channel = (freq - 2407) / 5;
	} else if (freq == 2484) {
	mode = HOSTAPD_MODE_IEEE80211B;
	*channel = 14;
	} else if (freq >= 4900 && freq < 5000) {
	mode = HOSTAPD_MODE_IEEE80211A;
	*channel = (freq - 4000) / 5;
	} else if (freq >= 5000 && freq < 5900) {
	mode = HOSTAPD_MODE_IEEE80211A;
	*channel = (freq - 5000) / 5;
	} else if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
	mode = HOSTAPD_MODE_IEEE80211AD;
	*channel = (freq - 56160) / 2160;
	}

	return mode;
	}


	static const char *us_op_class_cc[] = {
	"US", "CA", NULL
	};

	static const char *eu_op_class_cc[] = {
	"AL", "AM", "AT", "AZ", "BA", "BE", "BG", "BY", "CH", "CY", "CZ", "DE",
	"DK", "EE", "EL", "ES", "FI", "FR", "GE", "HR", "HU", "IE", "IS", "IT",
	"LI", "LT", "LU", "LV", "MD", "ME", "MK", "MT", "NL", "NO", "PL", "PT",
	"RO", "RS", "RU", "SE", "SI", "SK", "TR", "UA", "UK", NULL
	};

	static const char *jp_op_class_cc[] = {
	"JP", NULL
	};

	static const char *cn_op_class_cc[] = {
	"CN", "CA", NULL
	};


	static int country_match(const char cc[], const char country)
	{
	int i;

	if (country == NULL)
	return 0;
	for (i = 0; cc[i]; i++) {
	if (cc[i][0] == country[0] && cc[i][1] == country[1])
	return 1;
	}

	return 0;
	}


	static int ieee80211_chan_to_freq_us(u8 op_class, u8 chan)
	{
	switch (op_class) {
	case 12: /* channels 1..11 */
	case 32: /* channels 1..7; 40 MHz */
	case 33: /* channels 5..11; 40 MHz */
	if (chan < 1 \|\| chan > 11)
	return -1;
	return 2407 + 5 * chan;
	case 1: /* channels 36,40,44,48 */
	case 2: /* channels 52,56,60,64; dfs */
	case 22: /* channels 36,44; 40 MHz */
	case 23: /* channels 52,60; 40 MHz */
	case 27: /* channels 40,48; 40 MHz */
	case 28: /* channels 56,64; 40 MHz */
	if (chan < 36 \|\| chan > 64)
	return -1;
	return 5000 + 5 * chan;
	case 4: /* channels 100-144 */
	case 24: /* channels 100-140; 40 MHz */
	if (chan < 100 \|\| chan > 144)
	return -1;
	return 5000 + 5 * chan;
	case 3: /* channels 149,153,157,161 */
	case 25: /* channels 149,157; 40 MHz */
	case 26: /* channels 149,157; 40 MHz */
	case 30: /* channels 153,161; 40 MHz */
	case 31: /* channels 153,161; 40 MHz */
	if (chan < 149 \|\| chan > 161)
	return -1;
	return 5000 + 5 * chan;
	case 34: /* 60 GHz band, channels 1..3 */
	if (chan < 1 \|\| chan > 3)
	return -1;
	return 56160 + 2160 * chan;
	}
	return -1;
	}


	static int ieee80211_chan_to_freq_eu(u8 op_class, u8 chan)
	{
	switch (op_class) {
	case 4: /* channels 1..13 */
	case 11: /* channels 1..9; 40 MHz */
	case 12: /* channels 5..13; 40 MHz */
	if (chan < 1 \|\| chan > 13)
	return -1;
	return 2407 + 5 * chan;
	case 1: /* channels 36,40,44,48 */
	case 2: /* channels 52,56,60,64; dfs */
	case 5: /* channels 36,44; 40 MHz */
	case 6: /* channels 52,60; 40 MHz */
	case 8: /* channels 40,48; 40 MHz */
	case 9: /* channels 56,64; 40 MHz */
	if (chan < 36 \|\| chan > 64)
	return -1;
	return 5000 + 5 * chan;
	case 3: /* channels 100-140 */
	case 7: /* channels 100-132; 40 MHz */
	case 10: /* channels 104-136; 40 MHz */
	case 16: /* channels 100-140 */
	if (chan < 100 \|\| chan > 140)
	return -1;
	return 5000 + 5 * chan;
	case 17: /* channels 149,153,157,161,165,169 */
	if (chan < 149 \|\| chan > 169)
	return -1;
	return 5000 + 5 * chan;
	case 18: /* 60 GHz band, channels 1..4 */
	if (chan < 1 \|\| chan > 4)
	return -1;
	return 56160 + 2160 * chan;
	}
	return -1;
	}


	static int ieee80211_chan_to_freq_jp(u8 op_class, u8 chan)
	{
	switch (op_class) {
	case 30: /* channels 1..13 */
	case 56: /* channels 1..9; 40 MHz */
	case 57: /* channels 5..13; 40 MHz */
	if (chan < 1 \|\| chan > 13)
	return -1;
	return 2407 + 5 * chan;
	case 31: /* channel 14 */
	if (chan != 14)
	return -1;
	return 2414 + 5 * chan;
	case 1: /* channels 34,38,42,46(old) or 36,40,44,48 */
	case 32: /* channels 52,56,60,64 */
	case 33: /* channels 52,56,60,64 */
	case 36: /* channels 36,44; 40 MHz */
	case 37: /* channels 52,60; 40 MHz */
	case 38: /* channels 52,60; 40 MHz */
	case 41: /* channels 40,48; 40 MHz */
	case 42: /* channels 56,64; 40 MHz */
	case 43: /* channels 56,64; 40 MHz */
	if (chan < 34 \|\| chan > 64)
	return -1;
	return 5000 + 5 * chan;
	case 34: /* channels 100-140 */
	case 35: /* channels 100-140 */
	case 39: /* channels 100-132; 40 MHz */
	case 40: /* channels 100-132; 40 MHz */
	case 44: /* channels 104-136; 40 MHz */
	case 45: /* channels 104-136; 40 MHz */
	case 58: /* channels 100-140 */
	if (chan < 100 \|\| chan > 140)
	return -1;
	return 5000 + 5 * chan;
	case 59: /* 60 GHz band, channels 1..4 */
	if (chan < 1 \|\| chan > 3)
	return -1;
	return 56160 + 2160 * chan;
	}
	return -1;
	}


	static int ieee80211_chan_to_freq_cn(u8 op_class, u8 chan)
	{
	switch (op_class) {
	case 7: /* channels 1..13 */
	case 8: /* channels 1..9; 40 MHz */
	case 9: /* channels 5..13; 40 MHz */
	if (chan < 1 \|\| chan > 13)
	return -1;
	return 2407 + 5 * chan;
	case 1: /* channels 36,40,44,48 */
	case 2: /* channels 52,56,60,64; dfs */
	case 4: /* channels 36,44; 40 MHz */
	case 5: /* channels 52,60; 40 MHz */
	if (chan < 36 \|\| chan > 64)
	return -1;
	return 5000 + 5 * chan;
	case 3: /* channels 149,153,157,161,165 */
	case 6: /* channels 149,157; 40 MHz */
	if (chan < 149 \|\| chan > 165)
	return -1;
	return 5000 + 5 * chan;
	}
	return -1;
	}


	static int ieee80211_chan_to_freq_global(u8 op_class, u8 chan)
	{
	/* Table E-4 in IEEE Std 802.11-2012 - Global operating classes */
	switch (op_class) {
	case 81:
	/* channels 1..13 */
	if (chan < 1 \|\| chan > 13)
	return -1;
	return 2407 + 5 * chan;
	case 82:
	/* channel 14 */
	if (chan != 14)
	return -1;
	return 2414 + 5 * chan;
	case 83: /* channels 1..9; 40 MHz */
	case 84: /* channels 5..13; 40 MHz */
	if (chan < 1 \|\| chan > 13)
	return -1;
	return 2407 + 5 * chan;
	case 115: /* channels 36,40,44,48; indoor only */
	case 116: /* channels 36,44; 40 MHz; indoor only */
	case 117: /* channels 40,48; 40 MHz; indoor only */
	case 118: /* channels 52,56,60,64; dfs */
	case 119: /* channels 52,60; 40 MHz; dfs */
	case 120: /* channels 56,64; 40 MHz; dfs */
	if (chan < 36 \|\| chan > 64)
	return -1;
	return 5000 + 5 * chan;
	case 121: /* channels 100-140 */
	case 122: /* channels 100-142; 40 MHz */
	case 123: /* channels 104-136; 40 MHz */
	if (chan < 100 \|\| chan > 140)
	return -1;
	return 5000 + 5 * chan;
	case 124: /* channels 149,153,157,161 */
	case 125: /* channels 149,153,157,161,165,169 */
	case 126: /* channels 149,157; 40 MHz */
	case 127: /* channels 153,161; 40 MHz */
	if (chan < 149 \|\| chan > 161)
	return -1;
	return 5000 + 5 * chan;
	case 128: /* center freqs 42, 58, 106, 122, 138, 155; 80 MHz */
	case 130: /* center freqs 42, 58, 106, 122, 138, 155; 80 MHz */
	if (chan < 36 \|\| chan > 161)
	return -1;
	return 5000 + 5 * chan;
	case 129: /* center freqs 50, 114; 160 MHz */
	if (chan < 50 \|\| chan > 114)
	return -1;
	return 5000 + 5 * chan;
	case 180: /* 60 GHz band, channels 1..4 */
	if (chan < 1 \|\| chan > 4)
	return -1;
	return 56160 + 2160 * chan;
	}
	return -1;
	}

	/**
	* ieee80211_chan_to_freq - Convert channel info to frequency
	* @country: Country code, if known; otherwise, global operating class is used
	* @op_class: Operating class
	* @chan: Channel number
	* Returns: Frequency in MHz or -1 if the specified channel is unknown
	*/
	int ieee80211_chan_to_freq(const char *country, u8 op_class, u8 chan)
	{
	int freq;

	if (country_match(us_op_class_cc, country)) {
	freq = ieee80211_chan_to_freq_us(op_class, chan);
	if (freq > 0)
	return freq;
	}

	if (country_match(eu_op_class_cc, country)) {
	freq = ieee80211_chan_to_freq_eu(op_class, chan);
	if (freq > 0)
	return freq;
	}

	if (country_match(jp_op_class_cc, country)) {
	freq = ieee80211_chan_to_freq_jp(op_class, chan);
	if (freq > 0)
	return freq;
	}

	if (country_match(cn_op_class_cc, country)) {
	freq = ieee80211_chan_to_freq_cn(op_class, chan);
	if (freq > 0)
	return freq;
	}

	return ieee80211_chan_to_freq_global(op_class, chan);
	}


	int ieee80211_is_dfs(int freq)
	{
	/* TODO: this could be more accurate to better cover all domains */
	return (freq >= 5260 && freq <= 5320) \|\| (freq >= 5500 && freq <= 5700);
	}


	static int is_11b(u8 rate)
	{
	return rate == 0x02 \|\| rate == 0x04 \|\| rate == 0x0b \|\| rate == 0x16;
	}


	int supp_rates_11b_only(struct ieee802_11_elems *elems)
	{
	int num_11b = 0, num_others = 0;
	int i;

	if (elems->supp_rates == NULL && elems->ext_supp_rates == NULL)
	return 0;

	for (i = 0; elems->supp_rates && i < elems->supp_rates_len; i++) {
	if (is_11b(elems->supp_rates[i]))
	num_11b++;
	else
	num_others++;
	}

	for (i = 0; elems->ext_supp_rates && i < elems->ext_supp_rates_len;
	i++) {
	if (is_11b(elems->ext_supp_rates[i]))
	num_11b++;
	else
	num_others++;
	}

	return num_11b > 0 && num_others == 0;
	}


	const char * fc2str(u16 fc)
	{
	u16 stype = WLAN_FC_GET_STYPE(fc);
	#define C2S(x) case x: return #x;

	switch (WLAN_FC_GET_TYPE(fc)) {
	case WLAN_FC_TYPE_MGMT:
	switch (stype) {
	C2S(WLAN_FC_STYPE_ASSOC_REQ)
	C2S(WLAN_FC_STYPE_ASSOC_RESP)
	C2S(WLAN_FC_STYPE_REASSOC_REQ)
	C2S(WLAN_FC_STYPE_REASSOC_RESP)
	C2S(WLAN_FC_STYPE_PROBE_REQ)
	C2S(WLAN_FC_STYPE_PROBE_RESP)
	C2S(WLAN_FC_STYPE_BEACON)
	C2S(WLAN_FC_STYPE_ATIM)
	C2S(WLAN_FC_STYPE_DISASSOC)
	C2S(WLAN_FC_STYPE_AUTH)
	C2S(WLAN_FC_STYPE_DEAUTH)
	C2S(WLAN_FC_STYPE_ACTION)
	}
	break;
	case WLAN_FC_TYPE_CTRL:
	switch (stype) {
	C2S(WLAN_FC_STYPE_PSPOLL)
	C2S(WLAN_FC_STYPE_RTS)
	C2S(WLAN_FC_STYPE_CTS)
	C2S(WLAN_FC_STYPE_ACK)
	C2S(WLAN_FC_STYPE_CFEND)
	C2S(WLAN_FC_STYPE_CFENDACK)
	}
	break;
	case WLAN_FC_TYPE_DATA:
	switch (stype) {
	C2S(WLAN_FC_STYPE_DATA)
	C2S(WLAN_FC_STYPE_DATA_CFACK)
	C2S(WLAN_FC_STYPE_DATA_CFPOLL)
	C2S(WLAN_FC_STYPE_DATA_CFACKPOLL)
	C2S(WLAN_FC_STYPE_NULLFUNC)
	C2S(WLAN_FC_STYPE_CFACK)
	C2S(WLAN_FC_STYPE_CFPOLL)
	C2S(WLAN_FC_STYPE_CFACKPOLL)
	C2S(WLAN_FC_STYPE_QOS_DATA)
	C2S(WLAN_FC_STYPE_QOS_DATA_CFACK)
	C2S(WLAN_FC_STYPE_QOS_DATA_CFPOLL)
	C2S(WLAN_FC_STYPE_QOS_DATA_CFACKPOLL)
	C2S(WLAN_FC_STYPE_QOS_NULL)
	C2S(WLAN_FC_STYPE_QOS_CFPOLL)
	C2S(WLAN_FC_STYPE_QOS_CFACKPOLL)
	}
	break;
	}
	return "WLAN_FC_TYPE_UNKNOWN";
	#undef C2S
	}