libiwinfo: rework nl80211 interface code, plug remaining memory leaks

3 files changed, 370 insertions, 327 deletions

diff --git a/contrib/package/iwinfo/Makefile b/contrib/package/iwinfo/Makefile
index cffa8f9be..014e7a31b 100644
--- a/contrib/package/iwinfo/Makefile
+++ b/contrib/package/iwinfo/Makefile
@@ -7,7 +7,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libiwinfo
-PKG_RELEASE:=15
+PKG_RELEASE:=16
 
 PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
 
diff --git a/contrib/package/iwinfo/src/iwinfo_nl80211.c b/contrib/package/iwinfo/src/iwinfo_nl80211.c
index 280714ee5..abaeb511d 100644
--- a/contrib/package/iwinfo/src/iwinfo_nl80211.c
+++ b/contrib/package/iwinfo/src/iwinfo_nl80211.c
@@ -34,16 +34,16 @@ static int nl80211_init(void)
 {
 	int err, fd;
 
-	if( !nls )
+	if (!nls)
 	{
 		nls = malloc(sizeof(struct nl80211_state));
-		if( !nls ) {
+		if (!nls) {
 			err = -ENOMEM;
 			goto err;
 		}
 
 		nls->nl_sock = nl_socket_alloc();
-		if( !nls->nl_sock ) {
+		if (!nls->nl_sock) {
 			err = -ENOMEM;
 			goto err;
 		}
@@ -54,7 +54,7 @@ static int nl80211_init(void)
 		}
 
 		fd = nl_socket_get_fd(nls->nl_sock);
-		if( fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC) < 0 )
+		if (fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC) < 0)
 		{
 			err = -EINVAL;
 			goto err;
@@ -66,7 +66,7 @@ static int nl80211_init(void)
 		}
 
 		nls->nl80211 = genl_ctrl_search_by_name(nls->nl_cache, "nl80211");
-		if( !nls->nl80211 )
+		if (!nls->nl80211)
 		{
 			err = -ENOENT;
 			goto err;
@@ -105,28 +105,17 @@ static int nl80211_msg_ack(struct nl_msg *msg, void *arg)
 
 static int nl80211_msg_response(struct nl_msg *msg, void *arg)
 {
-	struct nl80211_msg_conveyor *cv = arg;
-
-	nlmsg_get(msg);
-
-	cv->msg = msg;
-	cv->hdr = nlmsg_data(nlmsg_hdr(cv->msg));
-
-	nla_parse(cv->attr, NL80211_ATTR_MAX,
-		genlmsg_attrdata(cv->hdr, 0),
-		genlmsg_attrlen(cv->hdr, 0), NULL);
-
 	return NL_SKIP;
 }
 
 static void nl80211_free(struct nl80211_msg_conveyor *cv)
 {
-	if( cv )
+	if (cv)
 	{
-		if( cv->cb )
+		if (cv->cb)
 			nl_cb_put(cv->cb);
 
-		if( cv->msg )
+		if (cv->msg)
 			nlmsg_free(cv->msg);
 
 		cv->cb  = NULL;
@@ -142,40 +131,38 @@ static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname, int cmd, in
 	struct nl_msg *req = NULL;
 	struct nl_cb *cb = NULL;
 
-	if( nl80211_init() < 0 )
+	if (nl80211_init() < 0)
 		goto err;
 
-	if( !strncmp(ifname, "phy", 3) )
+	if (!strncmp(ifname, "phy", 3))
 		phyidx = atoi(&ifname[3]);
-	else if( !strncmp(ifname, "radio", 5) )
+	else if (!strncmp(ifname, "radio", 5))
 		phyidx = atoi(&ifname[5]);
-	else if( !strncmp(ifname, "mon.", 4) )
+	else if (!strncmp(ifname, "mon.", 4))
 		ifidx = if_nametoindex(&ifname[4]);
 	else
 		ifidx = if_nametoindex(ifname);
 
-	if( (ifidx < 0) && (phyidx < 0) )
+	if ((ifidx < 0) && (phyidx < 0))
 		return NULL;
 
 	req = nlmsg_alloc();
-	if( !req )
+	if (!req)
 		goto err;
 
 	cb = nl_cb_alloc(NL_CB_DEFAULT);
-	if( !cb )
+	if (!cb)
 		goto err;
 
 	genlmsg_put(req, 0, 0, genl_family_get_id(nls->nl80211), 0,
 		flags, cmd, 0);
 
-	if( ifidx > -1 )
+	if (ifidx > -1)
 		NLA_PUT_U32(req, NL80211_ATTR_IFINDEX, ifidx);
 
-	if( phyidx > -1 )
+	if (phyidx > -1)
 		NLA_PUT_U32(req, NL80211_ATTR_WIPHY, phyidx);
 
-	nlmsg_get(req);
-
 	cv.msg       = req;
 	cv.cb        = cb;
 	cv.custom_cb = 0;
@@ -184,10 +171,10 @@ static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname, int cmd, in
 
 err:
 nla_put_failure:
-	if( cb )
+	if (cb)
 		nl_cb_put(cb);
 
-	if( req )
+	if (req)
 		nlmsg_free(req);
 
 	return NULL;
@@ -205,10 +192,10 @@ static struct nl80211_msg_conveyor * nl80211_send(struct nl80211_msg_conveyor *c
 	static struct nl80211_msg_conveyor rcv;
 	int err = 1;
 
-	if( !cv->custom_cb )
+	if (!cv->custom_cb)
 		nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_msg_response, &rcv);
 
-	if( nl_send_auto_complete(nls->nl_sock, cv->msg) < 0 )
+	if (nl_send_auto_complete(nls->nl_sock, cv->msg) < 0)
 		goto err;
 
 	nl_cb_err(cv->cb,               NL_CB_CUSTOM, nl80211_msg_error,  &err);
@@ -227,6 +214,17 @@ err:
 	return NULL;
 }
 
+static struct nlattr ** nl80211_parse(struct nl_msg *msg)
+{
+	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+	static struct nlattr *attr[NL80211_ATTR_MAX + 1];
+
+	nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
+		genlmsg_attrlen(gnlh, 0), NULL);
+
+	return attr;
+}
+
 static int nl80211_freq2channel(int freq)
 {
     if (freq == 2484)
@@ -250,28 +248,28 @@ static char * nl80211_getval(const char *ifname, const char *buf, const char *ke
 
 	for( i = 0, len = strlen(buf); i < len; i++ )
 	{
-		if( !lkey[0] && (buf[i] == ' ' || buf[i] == '\t') )
+		if (!lkey[0] && (buf[i] == ' ' || buf[i] == '\t'))
 		{
 			ln++;
 		}
-		else if( !lkey[0] && (buf[i] == '=') )
+		else if (!lkey[0] && (buf[i] == '='))
 		{
-			if( (&buf[i] - ln) > 0 )
+			if ((&buf[i] - ln) > 0)
 				memcpy(lkey, ln, min(sizeof(lkey) - 1, &buf[i] - ln));
 		}
-		else if( buf[i] == '\n' )
+		else if (buf[i] == '\n')
 		{
-			if( lkey[0] )
+			if (lkey[0])
 			{
 				memcpy(lval, ln + strlen(lkey) + 1,
 					min(sizeof(lval) - 1, &buf[i] - ln - strlen(lkey) - 1));
 
-				if( (ifname != NULL ) &&
+				if ((ifname != NULL) &&
 				    (!strcmp(lkey, "interface") || !strcmp(lkey, "bss")) )
 				{
 					matched_if = !strcmp(lval, ifname);
 				}
-				else if( matched_if && !strcmp(lkey, key) )
+				else if (matched_if && !strcmp(lkey, key))
 				{
 					return lval;
 				}
@@ -286,24 +284,29 @@ static char * nl80211_getval(const char *ifname, const char *buf, const char *ke
 	return NULL;
 }
 
+static int nl80211_ifname2phy_cb(struct nl_msg *msg, void *arg)
+{
+	char *buf = arg;
+	struct nlattr **attr = nl80211_parse(msg);
+
+	if (attr[NL80211_ATTR_WIPHY_NAME])
+		sprintf(buf, "%s", nla_data(attr[NL80211_ATTR_WIPHY_NAME]));
+	else
+		buf[0] = 0;
+
+	return NL_SKIP;
+}
+
 static char * nl80211_ifname2phy(const char *ifname)
 {
 	static char phy[32] = { 0 };
-	struct nl80211_msg_conveyor *req, *res;
+	struct nl80211_msg_conveyor *req;
 
 	req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
-	if( req )
+	if (req)
 	{
-		res = nl80211_send(req);
-		if( res )
-		{
-			if( res->attr[NL80211_ATTR_WIPHY_NAME] )
-			{
-				snprintf(phy, sizeof(phy), "%s",
-					 nla_get_string(res->attr[NL80211_ATTR_WIPHY_NAME]));
-			}
-			nl80211_free(res);
-		}
+		nl80211_cb(req, nl80211_ifname2phy_cb, phy);
+		nl80211_send(req);
 		nl80211_free(req);
 	}
 
@@ -317,11 +320,11 @@ static char * nl80211_hostapd_info(const char *ifname)
 	static char buf[4096] = { 0 };
 	FILE *conf;
 
-	if( (phy = nl80211_ifname2phy(ifname)) != NULL )
+	if ((phy = nl80211_ifname2phy(ifname)) != NULL)
 	{
 		snprintf(path, sizeof(path), "/var/run/hostapd-%s.conf", phy);
 
-		if( (conf = fopen(path, "r")) != NULL )
+		if ((conf = fopen(path, "r")) != NULL)
 		{
 			fread(buf, sizeof(buf) - 1, 1, conf);
 			fclose(conf);
@@ -344,10 +347,10 @@ static inline int nl80211_wpactl_recv(int sock, char *buf, int blen)
 	memset(buf, 0, blen);
 
 
-	if( select(sock + 1, &rfds, NULL, NULL, &tv) < 0 )
+	if (select(sock + 1, &rfds, NULL, NULL, &tv) < 0)
 		return -1;
 
-	if( !FD_ISSET(sock, &rfds) )
+	if (!FD_ISSET(sock, &rfds))
 		return -1;
 
 	return recv(sock, buf, blen, 0);
@@ -367,30 +370,30 @@ static char * nl80211_wpactl_info(const char *ifname, const char *cmd,
 
 
 	sock = socket(PF_UNIX, SOCK_DGRAM, 0);
-	if( sock < 0 )
+	if (sock < 0)
 		return NULL;
 
 	remote.sun_family = AF_UNIX;
 	remote_length = sizeof(remote.sun_family) + sprintf(remote.sun_path,
 		"/var/run/wpa_supplicant-%s/%s", ifname, ifname);
 
-	if( fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC) < 0 )
+	if (fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC) < 0)
 		goto out;
 
-	if( connect(sock, (struct sockaddr *) &remote, remote_length) )
+	if (connect(sock, (struct sockaddr *) &remote, remote_length))
 		goto out;
 
 	local.sun_family = AF_UNIX;
 	local_length = sizeof(local.sun_family) + sprintf(local.sun_path,
 		"/var/run/iwinfo-%s-%d", ifname, getpid());
 
-	if( bind(sock, (struct sockaddr *) &local, local_length) )
+	if (bind(sock, (struct sockaddr *) &local, local_length))
 		goto out;
 
 
 	send(sock, "ATTACH", 6, 0);
 
-	if( nl80211_wpactl_recv(sock, buffer, sizeof(buffer)) <= 0 )
+	if (nl80211_wpactl_recv(sock, buffer, sizeof(buffer)) <= 0)
 		goto out;
 
 
@@ -398,15 +401,15 @@ static char * nl80211_wpactl_info(const char *ifname, const char *cmd,
 
 	while( numtry++ < 5 )
 	{
-		if( nl80211_wpactl_recv(sock, buffer, sizeof(buffer)) <= 0 )
+		if (nl80211_wpactl_recv(sock, buffer, sizeof(buffer)) <= 0)
 		{
-			if( event )
+			if (event)
 				continue;
 
 			break;
 		}
 
-		if( (!event && buffer[0] != '<') || strstr(buffer, event) )
+		if ((!event && buffer[0] != '<') || strstr(buffer, event))
 			break;
 	}
 
@@ -415,7 +418,7 @@ static char * nl80211_wpactl_info(const char *ifname, const char *cmd,
 out:
 	close(sock);
 
-	if( local.sun_family )
+	if (local.sun_family)
 		unlink(local.sun_path);
 
 	return rv;
@@ -427,9 +430,9 @@ static inline int nl80211_readint(const char *path)
 	int rv = -1;
 	char buffer[16];
 
-	if( (fd = open(path, O_RDONLY)) > -1 )
+	if ((fd = open(path, O_RDONLY)) > -1)
 	{
-		if( read(fd, buffer, sizeof(buffer)) > 0 )
+		if (read(fd, buffer, sizeof(buffer)) > 0)
 			rv = atoi(buffer);
 
 		close(fd);
@@ -447,23 +450,23 @@ static char * nl80211_phy2ifname(const char *ifname)
 	DIR *d;
 	struct dirent *e;
 
-	if( !ifname )
+	if (!ifname)
 		return NULL;
-	else if( !strncmp(ifname, "phy", 3) )
+	else if (!strncmp(ifname, "phy", 3))
 		phyidx = atoi(&ifname[3]);
-	else if( !strncmp(ifname, "radio", 5) )
+	else if (!strncmp(ifname, "radio", 5))
 		phyidx = atoi(&ifname[5]);
 
-	if( phyidx > -1 )
+	if (phyidx > -1)
 	{
-		if( (d = opendir("/sys/class/net")) != NULL )
+		if ((d = opendir("/sys/class/net")) != NULL)
 		{
 			while( (e = readdir(d)) != NULL )
 			{
 				snprintf(buffer, sizeof(buffer),
 					"/sys/class/net/%s/phy80211/index", e->d_name);
 
-				if( nl80211_readint(buffer) == phyidx )
+				if (nl80211_readint(buffer) == phyidx)
 				{
 					snprintf(buffer, sizeof(buffer),
 						"/sys/class/net/%s/ifindex", e->d_name);
@@ -492,19 +495,16 @@ static char * nl80211_ifadd(const char *ifname)
 	struct nl80211_msg_conveyor *req, *res;
 
 	req = nl80211_msg(ifname, NL80211_CMD_NEW_INTERFACE, 0);
-	if( req )
+	if (req)
 	{
 		snprintf(nif, sizeof(nif), "tmp.%s", ifname);
 
 		NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, nif);
 		NLA_PUT_U32(req->msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_STATION);
 
-		res = nl80211_send(req);
-		if( res )
-		{
-			rv = nif;
-			nl80211_free(res);
-		}
+		nl80211_send(req);
+
+		rv = nif;
 
 	nla_put_failure:
 		nl80211_free(req);
@@ -518,11 +518,11 @@ static void nl80211_ifdel(const char *ifname)
 	struct nl80211_msg_conveyor *req;
 
 	req = nl80211_msg(ifname, NL80211_CMD_DEL_INTERFACE, 0);
-	if( req )
+	if (req)
 	{
 		NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, ifname);
 
-		nl80211_free(nl80211_send(req));
+		nl80211_send(req);
 
 	nla_put_failure:
 		nl80211_free(req);
@@ -535,18 +535,18 @@ static void nl80211_hostapd_hup(const char *ifname)
 	char buf[32];
 	char *phy = nl80211_ifname2phy(ifname);
 
-	if( phy )
+	if (phy)
 	{
 		snprintf(buf, sizeof(buf), "/var/run/wifi-%s.pid", phy);
-		if( (fd = open(buf, O_RDONLY)) > 0 )
+		if ((fd = open(buf, O_RDONLY)) > 0)
 		{
-			if( read(fd, buf, sizeof(buf)) > 0 )
+			if (read(fd, buf, sizeof(buf)) > 0)
 				pid = atoi(buf);
 
 			close(fd);
 		}
 
-		if( pid > 0 )
+		if (pid > 0)
 			kill(pid, 1);
 	}
 }
@@ -559,12 +559,12 @@ int nl80211_probe(const char *ifname)
 
 void nl80211_close(void)
 {
-	if( nls )
+	if (nls)
 	{
-		if( nls->nl_sock )
+		if (nls->nl_sock)
 			nl_socket_free(nls->nl_sock);
 
-		if( nls->nl_cache )
+		if (nls->nl_cache)
 			nl_cache_free(nls->nl_cache);
 
 		free(nls);
@@ -581,7 +581,7 @@ int nl80211_get_ssid(const char *ifname, char *buf)
 {
 	char *ssid;
 
-	if( !wext_get_ssid(ifname, buf) )
+	if (!wext_get_ssid(ifname, buf))
 	{
 		return 0;
 	}
@@ -600,12 +600,12 @@ int nl80211_get_bssid(const char *ifname, char *buf)
 	char *bssid;
 	unsigned char mac[6];
 
-	if( !wext_get_bssid(ifname, buf) )
+	if (!wext_get_bssid(ifname, buf))
 	{
 		return 0;
 	}
-	else if( (bssid = nl80211_hostapd_info(ifname)) &&
-	         (bssid = nl80211_getval(ifname, bssid, "bssid")) )
+	else if((bssid = nl80211_hostapd_info(ifname)) &&
+	         (bssid = nl80211_getval(ifname, bssid, "bssid")))
 	{
 		mac[0] = strtol(&bssid[0],  NULL, 16);
 		mac[1] = strtol(&bssid[3],  NULL, 16);
@@ -627,10 +627,10 @@ int nl80211_get_channel(const char *ifname, int *buf)
 {
 	char *first;
 
-	if( !wext_get_channel(ifname, buf) )
+	if (!wext_get_channel(ifname, buf))
 		return 0;
 
-	else if( (first = nl80211_phy2ifname(nl80211_ifname2phy(ifname))) != NULL )
+	else if ((first = nl80211_phy2ifname(nl80211_ifname2phy(ifname))) != NULL)
 		return wext_get_channel(first, buf);
 
 	return -1;
@@ -640,10 +640,10 @@ int nl80211_get_frequency(const char *ifname, int *buf)
 {
 	char *first;
 
-	if( !wext_get_frequency(ifname, buf) )
+	if (!wext_get_frequency(ifname, buf))
 		return 0;
 
-	else if( (first = nl80211_phy2ifname(nl80211_ifname2phy(ifname))) != NULL )
+	else if ((first = nl80211_phy2ifname(nl80211_ifname2phy(ifname))) != NULL)
 		return wext_get_frequency(first, buf);
 
 	return -1;
@@ -660,9 +660,7 @@ static int nl80211_fill_signal_cb(struct nl_msg *msg, void *arg)
 	int8_t dbm;
 	int16_t mbit;
 	struct nl80211_rssi_rate *rr = arg;
-
-	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
-	struct nlattr *attr[NL80211_ATTR_MAX + 1];
+	struct nlattr **attr = nl80211_parse(msg);
 	struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
 	struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
 
@@ -686,26 +684,23 @@ static int nl80211_fill_signal_cb(struct nl_msg *msg, void *arg)
 		[NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG },
 	};
 
-	nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
-		  genlmsg_attrlen(gnlh, 0), NULL);
-
-	if( attr[NL80211_ATTR_STA_INFO] )
+	if (attr[NL80211_ATTR_STA_INFO])
 	{
 		if( !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
 				attr[NL80211_ATTR_STA_INFO], stats_policy) )
 		{
-			if( sinfo[NL80211_STA_INFO_SIGNAL] )
+			if (sinfo[NL80211_STA_INFO_SIGNAL])
 			{
 				dbm = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
 				rr->rssi = rr->rssi ? (int8_t)((rr->rssi + dbm) / 2) : dbm;
 			}
 
-			if( sinfo[NL80211_STA_INFO_TX_BITRATE] )
+			if (sinfo[NL80211_STA_INFO_TX_BITRATE])
 			{
 				if( !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
 						sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy) )
 				{
-					if( rinfo[NL80211_RATE_INFO_BITRATE] )
+					if (rinfo[NL80211_RATE_INFO_BITRATE])
 					{
 						mbit = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
 						rr->rate = rr->rate
@@ -742,7 +737,7 @@ static void nl80211_fill_signal(const char *ifname, struct nl80211_rssi_rate *r)
 				if (req)
 				{
 					nl80211_cb(req, nl80211_fill_signal_cb, r);
-					nl80211_free(nl80211_send(req));
+					nl80211_send(req);
 					nl80211_free(req);
 				}
 			}
@@ -756,7 +751,7 @@ int nl80211_get_bitrate(const char *ifname, int *buf)
 {
 	struct nl80211_rssi_rate rr;
 
-	if( !wext_get_bitrate(ifname, buf) )
+	if (!wext_get_bitrate(ifname, buf))
 		return 0;
 
 	nl80211_fill_signal(ifname, &rr);
@@ -774,7 +769,7 @@ int nl80211_get_signal(const char *ifname, int *buf)
 {
 	struct nl80211_rssi_rate rr;
 
-	if( !wext_get_signal(ifname, buf) )
+	if (!wext_get_signal(ifname, buf))
 		return 0;
 
 	nl80211_fill_signal(ifname, &rr);
@@ -791,8 +786,7 @@ int nl80211_get_signal(const char *ifname, int *buf)
 static int nl80211_get_noise_cb(struct nl_msg *msg, void *arg)
 {
 	int8_t *noise = arg;
-	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
-	struct nlattr *tb[NL80211_ATTR_MAX + 1];
+	struct nlattr **tb = nl80211_parse(msg);
 	struct nlattr *si[NL80211_SURVEY_INFO_MAX + 1];
 
 	static struct nla_policy sp[NL80211_SURVEY_INFO_MAX + 1] = {
@@ -800,9 +794,6 @@ static int nl80211_get_noise_cb(struct nl_msg *msg, void *arg)
 		[NL80211_SURVEY_INFO_NOISE]     = { .type = NLA_U8  },
 	};
 
-	nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
-		genlmsg_attrlen(gnlh, 0), NULL);
-
 	if (!tb[NL80211_ATTR_SURVEY_INFO])
 		return NL_SKIP;
 
@@ -831,7 +822,7 @@ int nl80211_get_noise(const char *ifname, int *buf)
 		noise = 0;
 
 		nl80211_cb(req, nl80211_get_noise_cb, &noise);
-		nl80211_free(nl80211_send(req));
+		nl80211_send(req);
 		nl80211_free(req);
 
 		if (noise)
@@ -848,15 +839,15 @@ int nl80211_get_quality(const char *ifname, int *buf)
 {
 	int signal;
 
-	if( wext_get_quality(ifname, buf) )
+	if (wext_get_quality(ifname, buf))
 	{
 		*buf = 0;
 
-		if( !nl80211_get_signal(ifname, &signal) )
+		if (!nl80211_get_signal(ifname, &signal))
 		{
 			/* A positive signal level is usually just a quality
 			 * value, pass through as-is */
-			if( signal >= 0 )
+			if (signal >= 0)
 			{
 				*buf = signal;
 			}
@@ -866,9 +857,9 @@ int nl80211_get_quality(const char *ifname, int *buf)
 			 * by adding 110 to the signal level */
 			else
 			{
-				if( signal < -110 )
+				if (signal < -110)
 					signal = -110;
-				else if( signal > -40 )
+				else if (signal > -40)
 					signal = -40;
 
 				*buf = (signal + 110);
@@ -881,7 +872,7 @@ int nl80211_get_quality(const char *ifname, int *buf)
 
 int nl80211_get_quality_max(const char *ifname, int *buf)
 {
-	if( wext_get_quality_max(ifname, buf) )
+	if (wext_get_quality_max(ifname, buf))
 		/* The cfg80211 wext compat layer assumes a maximum
 		 * quality of 70 */
 		*buf = 70;
@@ -901,12 +892,12 @@ int nl80211_get_encryption(const char *ifname, char *buf)
 	    (val = nl80211_getval(NULL, res, "pairwise_cipher")) )
 	{
 		/* WEP */
-		if( strstr(val, "WEP") )
+		if (strstr(val, "WEP"))
 		{
-			if( strstr(val, "WEP-40") )
+			if (strstr(val, "WEP-40"))
 				c->pair_ciphers |= IWINFO_CIPHER_WEP40;
 
-			else if( strstr(val, "WEP-104") )
+			else if (strstr(val, "WEP-104"))
 				c->pair_ciphers |= IWINFO_CIPHER_WEP104;
 
 			c->enabled       = 1;
@@ -919,57 +910,57 @@ int nl80211_get_encryption(const char *ifname, char *buf)
 		/* WPA */
 		else
 		{
-			if( strstr(val, "TKIP") )
+			if (strstr(val, "TKIP"))
 				c->pair_ciphers |= IWINFO_CIPHER_TKIP;
 
-			else if( strstr(val, "CCMP") )
+			else if (strstr(val, "CCMP"))
 				c->pair_ciphers |= IWINFO_CIPHER_CCMP;
 
-			else if( strstr(val, "NONE") )
+			else if (strstr(val, "NONE"))
 				c->pair_ciphers |= IWINFO_CIPHER_NONE;
 
-			else if( strstr(val, "WEP-40") )
+			else if (strstr(val, "WEP-40"))
 				c->pair_ciphers |= IWINFO_CIPHER_WEP40;
 
-			else if( strstr(val, "WEP-104") )
+			else if (strstr(val, "WEP-104"))
 				c->pair_ciphers |= IWINFO_CIPHER_WEP104;
 
 
-			if( (val = nl80211_getval(NULL, res, "group_cipher")) )
+			if ((val = nl80211_getval(NULL, res, "group_cipher")))
 			{
-				if( strstr(val, "TKIP") )
+				if (strstr(val, "TKIP"))
 					c->group_ciphers |= IWINFO_CIPHER_TKIP;
 
-				else if( strstr(val, "CCMP") )
+				else if (strstr(val, "CCMP"))
 					c->group_ciphers |= IWINFO_CIPHER_CCMP;
 
-				else if( strstr(val, "NONE") )
+				else if (strstr(val, "NONE"))
 					c->group_ciphers |= IWINFO_CIPHER_NONE;
 
-				else if( strstr(val, "WEP-40") )
+				else if (strstr(val, "WEP-40"))
 					c->group_ciphers |= IWINFO_CIPHER_WEP40;
 
-				else if( strstr(val, "WEP-104") )
+				else if (strstr(val, "WEP-104"))
 					c->group_ciphers |= IWINFO_CIPHER_WEP104;
 			}
 
 
-			if( (val = nl80211_getval(NULL, res, "key_mgmt")) )
+			if ((val = nl80211_getval(NULL, res, "key_mgmt")))
 			{
-				if( strstr(val, "WPA2") )
+				if (strstr(val, "WPA2"))
 					c->wpa_version = 2;
 
-				else if( strstr(val, "WPA") )
+				else if (strstr(val, "WPA"))
 					c->wpa_version = 1;
 
 
-				if( strstr(val, "PSK") )
+				if (strstr(val, "PSK"))
 					c->auth_suites |= IWINFO_KMGMT_PSK;
 
-				else if( strstr(val, "EAP") || strstr(val, "802.1X") )
+				else if (strstr(val, "EAP") || strstr(val, "802.1X"))
 					c->auth_suites |= IWINFO_KMGMT_8021x;
 
-				else if( strstr(val, "NONE") )
+				else if (strstr(val, "NONE"))
 					c->auth_suites |= IWINFO_KMGMT_NONE;
 			}
 
@@ -980,35 +971,35 @@ int nl80211_get_encryption(const char *ifname, char *buf)
 	}
 
 	/* Hostapd */
-	else if( (res = nl80211_hostapd_info(ifname)) )
+	else if ((res = nl80211_hostapd_info(ifname)))
 	{
-		if( (val = nl80211_getval(ifname, res, "wpa")) != NULL )
+		if ((val = nl80211_getval(ifname, res, "wpa")) != NULL)
 			c->wpa_version = atoi(val);
 
 		val = nl80211_getval(ifname, res, "wpa_key_mgmt");
 
-		if( !val || strstr(val, "PSK") )
+		if (!val || strstr(val, "PSK"))
 			c->auth_suites |= IWINFO_KMGMT_PSK;
 
-		if( val && strstr(val, "EAP") )
+		if (val && strstr(val, "EAP"))
 			c->auth_suites |= IWINFO_KMGMT_8021x;
 
-		if( val && strstr(val, "NONE") )
+		if (val && strstr(val, "NONE"))
 			c->auth_suites |= IWINFO_KMGMT_NONE;
 
-		if( (val = nl80211_getval(ifname, res, "wpa_pairwise")) != NULL )
+		if ((val = nl80211_getval(ifname, res, "wpa_pairwise")) != NULL)
 		{
-			if( strstr(val, "TKIP") )
+			if (strstr(val, "TKIP"))
 				c->pair_ciphers |= IWINFO_CIPHER_TKIP;
 
-			if( strstr(val, "CCMP") )
+			if (strstr(val, "CCMP"))
 				c->pair_ciphers |= IWINFO_CIPHER_CCMP;
 
-			if( strstr(val, "NONE") )
+			if (strstr(val, "NONE"))
 				c->pair_ciphers |= IWINFO_CIPHER_NONE;
 		}
 
-		if( (val = nl80211_getval(ifname, res, "auth_algs")) != NULL )
+		if ((val = nl80211_getval(ifname, res, "auth_algs")) != NULL)
 		{
 			switch(atoi(val)) {
 				case 1:
@@ -1032,12 +1023,12 @@ int nl80211_get_encryption(const char *ifname, char *buf)
 			{
 				snprintf(k, sizeof(k), "wep_key%d", i);
 
-				if( (val = nl80211_getval(ifname, res, k)) )
+				if ((val = nl80211_getval(ifname, res, k)))
 				{
-					if( (strlen(val) == 5) || (strlen(val) == 10) )
+					if ((strlen(val) == 5) || (strlen(val) == 10))
 						c->pair_ciphers |= IWINFO_CIPHER_WEP40;
 
-					else if( (strlen(val) == 13) || (strlen(val) == 26) )
+					else if ((strlen(val) == 13) || (strlen(val) == 26))
 						c->pair_ciphers |= IWINFO_CIPHER_WEP104;
 				}
 			}
@@ -1055,9 +1046,9 @@ int nl80211_get_encryption(const char *ifname, char *buf)
 
 static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
 {
-	struct nl80211_assoc_count *ac = arg;
-	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
-	struct nlattr *attr[NL80211_ATTR_MAX + 1];
+	struct nl80211_arraybuf *arr = arg;
+	struct iwinfo_assoclist_entry *e = arr->buf;
+	struct nlattr **attr = nl80211_parse(msg);
 	struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
 
 	static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
@@ -1073,25 +1064,24 @@ static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
 		[NL80211_STA_INFO_PLINK_STATE]   = { .type = NLA_U8     },
 	};
 
-	nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
-		genlmsg_attrlen(gnlh, 0), NULL);
+	/* advance to end of array */
+	e += arr->count;
 
-	if( attr[NL80211_ATTR_MAC] )
-		memcpy(ac->entry->mac, nla_data(attr[NL80211_ATTR_MAC]), 6);
+	if (attr[NL80211_ATTR_MAC])
+		memcpy(e->mac, nla_data(attr[NL80211_ATTR_MAC]), 6);
 
-	if( attr[NL80211_ATTR_STA_INFO] )
+	if (attr[NL80211_ATTR_STA_INFO])
 	{
-		if( !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
-				attr[NL80211_ATTR_STA_INFO], stats_policy) )
+		if (!nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
+				attr[NL80211_ATTR_STA_INFO], stats_policy))
 		{
-			if( sinfo[NL80211_STA_INFO_SIGNAL] )
-				ac->entry->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
+			if (sinfo[NL80211_STA_INFO_SIGNAL])
+				e->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
 		}
 	}
 
-	ac->entry->noise = ac->noise;
-	ac->entry++;
-	ac->count++;
+	e->noise = 0; /* filled in by caller */
+	arr->count++;
 
 	return NL_SKIP;
 }
@@ -1099,17 +1089,14 @@ static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
 int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
 {
 	DIR *d;
+	int i, noise = 0;
 	struct dirent *de;
-	struct nl80211_assoc_count ac;
 	struct nl80211_msg_conveyor *req;
+	struct nl80211_arraybuf arr = { .buf = buf, .count = 0 };
+	struct iwinfo_assoclist_entry *e;
 
 	if ((d = opendir("/sys/class/net")) != NULL)
 	{
-		ac.count = 0;
-		ac.entry = (struct iwinfo_assoclist_entry *)buf;
-
-		nl80211_get_noise(ifname, &ac.noise);
-
 		while ((de = readdir(d)) != NULL)
 		{
 			if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
@@ -1121,31 +1108,37 @@ int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
 
 				if (req)
 				{
-					nl80211_cb(req, nl80211_get_assoclist_cb, &ac);
-					nl80211_free(nl80211_send(req));
+					nl80211_cb(req, nl80211_get_assoclist_cb, &arr);
+					nl80211_send(req);
 					nl80211_free(req);
 				}
+
+				break;
 			}
 		}
 
 		closedir(d);
 
-		*len = (ac.count * sizeof(struct iwinfo_assoclist_entry));
+		if (!nl80211_get_noise(ifname, &noise))
+			for (i = 0, e = arr.buf; i < arr.count; i++, e++)
+				e->noise = noise;
+
+		*len = (arr.count * sizeof(struct iwinfo_assoclist_entry));
 		return 0;
 	}
 
 	return -1;
 }
 
-int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
+static int nl80211_get_txpwrlist_cb(struct nl_msg *msg, void *arg)
 {
+	int *dbm_max = arg;
 	int ch_cur, ch_cmp, bands_remain, freqs_remain;
-	int dbm_max = -1, dbm_cur, dbm_cnt;
-	struct nl80211_msg_conveyor *req, *res;
+
+	struct nlattr **attr = nl80211_parse(msg);
 	struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
 	struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
 	struct nlattr *band, *freq;
-	struct iwinfo_txpwrlist_entry entry;
 
 	static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
 		[NL80211_FREQUENCY_ATTR_FREQ]         = { .type = NLA_U32  },
@@ -1156,51 +1149,63 @@ int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
 		[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32  },
 	};
 
-	if( nl80211_get_channel(ifname, &ch_cur) )
-		ch_cur = 0;
+	ch_cur = *dbm_max; /* value int* is initialized with channel by caller */
+	*dbm_max = -1;
 
-	req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
-	if( req )
+	nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
 	{
-		res = nl80211_send(req);
-		if( res )
+		nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
+			  nla_len(band), NULL);
+
+		nla_for_each_nested(freq,
+			bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
 		{
-			nla_for_each_nested(band,
-				res->attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
+			nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
+				nla_data(freq), nla_len(freq), freq_policy);
+
+			ch_cmp = nl80211_freq2channel(
+				nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]));
+
+			if( (!ch_cur || (ch_cmp == ch_cur)) &&
+				freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] )
 			{
-				nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
-					  nla_len(band), NULL);
+				*dbm_max = (int)(0.01 * nla_get_u32(
+					freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]));
 
-				nla_for_each_nested(freq,
-					bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
-				{
-					nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
-						nla_data(freq), nla_len(freq), freq_policy);
+				break;
+			}
+		}
+	}
 
-					ch_cmp = nl80211_freq2channel(
-						nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]));
+	return NL_SKIP;
+}
 
-					if( (!ch_cur || (ch_cmp == ch_cur)) &&
-					    freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] )
-					{
-						dbm_max = (int)(0.01 * nla_get_u32(
-							freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]));
+int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
+{
+	int ch_cur;
+	int dbm_max = -1, dbm_cur, dbm_cnt;
+	struct nl80211_msg_conveyor *req;
+	struct iwinfo_txpwrlist_entry entry;
 
-						break;
-					}
-				}
-			}
+	if (nl80211_get_channel(ifname, &ch_cur))
+		ch_cur = 0;
 
-			nl80211_free(res);
-		}
+	req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
+	if (req)
+	{
+		/* initialize the value pointer with channel for callback */
+		dbm_max = ch_cur;
+
+		nl80211_cb(req, nl80211_get_txpwrlist_cb, &dbm_max);
+		nl80211_send(req);
 		nl80211_free(req);
 	}
 
-	if( dbm_max > -1 )
+	if (dbm_max > -1)
 	{
-		for( dbm_cur = 0, dbm_cnt = 0;
+		for (dbm_cur = 0, dbm_cnt = 0;
 		     dbm_cur < dbm_max;
-		     dbm_cur++, dbm_cnt++ )
+		     dbm_cur++, dbm_cnt++)
 		{
 			entry.dbm = dbm_cur;
 			entry.mw  = iwinfo_dbm2mw(dbm_cur);
@@ -1224,43 +1229,43 @@ int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
 static void nl80211_get_scancrypto(const char *spec,
 	struct iwinfo_crypto_entry *c)
 {
-	if( strstr(spec, "WPA") || strstr(spec, "WEP") )
+	if (strstr(spec, "WPA") || strstr(spec, "WEP"))
 	{
 		c->enabled = 1;
 
-		if( strstr(spec, "WPA2-") && strstr(spec, "WPA-") )
+		if (strstr(spec, "WPA2-") && strstr(spec, "WPA-"))
 			c->wpa_version = 3;
 
-		else if( strstr(spec, "WPA2") )
+		else if (strstr(spec, "WPA2"))
 			c->wpa_version = 2;
 
-		else if( strstr(spec, "WPA") )
+		else if (strstr(spec, "WPA"))
 			c->wpa_version = 1;
 
-		else if( strstr(spec, "WEP") )
+		else if (strstr(spec, "WEP"))
 			c->auth_algs = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
 
 
-		if( strstr(spec, "PSK") )
+		if (strstr(spec, "PSK"))
 			c->auth_suites |= IWINFO_KMGMT_PSK;
 
-		if( strstr(spec, "802.1X") || strstr(spec, "EAP") )
+		if (strstr(spec, "802.1X") || strstr(spec, "EAP"))
 			c->auth_suites |= IWINFO_KMGMT_8021x;
 
-		if( strstr(spec, "WPA-NONE") )
+		if (strstr(spec, "WPA-NONE"))
 			c->auth_suites |= IWINFO_KMGMT_NONE;
 
 
-		if( strstr(spec, "TKIP") )
+		if (strstr(spec, "TKIP"))
 			c->pair_ciphers |= IWINFO_CIPHER_TKIP;
 
-		if( strstr(spec, "CCMP") )
+		if (strstr(spec, "CCMP"))
 			c->pair_ciphers |= IWINFO_CIPHER_CCMP;
 
-		if( strstr(spec, "WEP-40") )
+		if (strstr(spec, "WEP-40"))
 			c->pair_ciphers |= IWINFO_CIPHER_WEP40;
 
-		if( strstr(spec, "WEP-104") )
+		if (strstr(spec, "WEP-104"))
 			c->pair_ciphers |= IWINFO_CIPHER_WEP104;
 
 		c->group_ciphers = c->pair_ciphers;
@@ -1280,16 +1285,16 @@ int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
 	char cipher[256] = { 0 };
 
 	/* Got a radioX pseudo interface, find some interface on it or create one */
-	if( !strncmp(ifname, "radio", 5) )
+	if (!strncmp(ifname, "radio", 5))
 	{
 		/* Reuse existing interface */
-		if( (res = nl80211_phy2ifname(ifname)) != NULL )
+		if ((res = nl80211_phy2ifname(ifname)) != NULL)
 		{
 			return nl80211_get_scanlist(res, buf, len);
 		}
 
 		/* Need to spawn a temporary iface for scanning */
-		else if( (res = nl80211_ifadd(ifname)) != NULL )
+		else if ((res = nl80211_ifadd(ifname)) != NULL)
 		{
 			count = nl80211_get_scanlist(res, buf, len);
 			nl80211_ifdel(res);
@@ -1300,9 +1305,9 @@ int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
 	struct iwinfo_scanlist_entry *e = (struct iwinfo_scanlist_entry *)buf;
 
 	/* WPA supplicant */
-	if( (res = nl80211_wpactl_info(ifname, "SCAN", "CTRL-EVENT-SCAN-RESULTS")) )
+	if ((res = nl80211_wpactl_info(ifname, "SCAN", "CTRL-EVENT-SCAN-RESULTS")))
 	{
-		if( (res = nl80211_wpactl_info(ifname, "SCAN_RESULTS", NULL)) )
+		if ((res = nl80211_wpactl_info(ifname, "SCAN_RESULTS", NULL)))
 		{
 			nl80211_get_quality_max(ifname, &qmax);
 
@@ -1336,14 +1341,14 @@ int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
 				e->signal = rssi;
 
 				/* Quality */
-				if( rssi < 0 )
+				if (rssi < 0)
 				{
 					/* The cfg80211 wext compat layer assumes a signal range
 					 * of -110 dBm to -40 dBm, the quality value is derived
 					 * by adding 110 to the signal level */
-					if( rssi < -110 )
+					if (rssi < -110)
 						rssi = -110;
-					else if( rssi > -40 )
+					else if (rssi > -40)
 						rssi = -40;
 
 					e->quality = (rssi + 110);
@@ -1379,9 +1384,9 @@ int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
 	else
 	{
 		/* Got a temp interface, don't create yet another one */
-		if( !strncmp(ifname, "tmp.", 4) )
+		if (!strncmp(ifname, "tmp.", 4))
 		{
-			if( !iwinfo_ifup(ifname) )
+			if (!iwinfo_ifup(ifname))
 				return -1;
 
 			wext_get_scanlist(ifname, buf, len);
@@ -1392,15 +1397,15 @@ int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
 		/* Spawn a new scan interface */
 		else
 		{
-			if( !(res = nl80211_ifadd(ifname)) )
+			if (!(res = nl80211_ifadd(ifname)))
 				goto out;
 
-			if( !iwinfo_ifmac(res) )
+			if (!iwinfo_ifmac(res))
 				goto out;
 
 			/* if we can take the new interface up, the driver supports an
 			 * additional interface and there's no need to tear down the ap */
-			if( iwinfo_ifup(res) )
+			if (iwinfo_ifup(res))
 			{
 				wext_get_scanlist(res, buf, len);
 				iwinfo_ifdown(res);
@@ -1408,7 +1413,7 @@ int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
 
 			/* driver cannot create secondary interface, take down ap
 			 * during scan */
-			else if( iwinfo_ifdown(ifname) && iwinfo_ifup(res) )
+			else if (iwinfo_ifdown(ifname) && iwinfo_ifup(res))
 			{
 				wext_get_scanlist(res, buf, len);
 				iwinfo_ifdown(res);
@@ -1425,83 +1430,108 @@ int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
 	return -1;
 }
 
-int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
+static int nl80211_get_freqlist_cb(struct nl_msg *msg, void *arg)
 {
-	int count = 0, bands_remain, freqs_remain;
-	struct nl80211_msg_conveyor *req, *res;
+	int bands_remain, freqs_remain;
+
+	struct nl80211_arraybuf *arr = arg;
+	struct iwinfo_freqlist_entry *e = arr->buf;
+
+	struct nlattr **attr = nl80211_parse(msg);
 	struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
 	struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
 	struct nlattr *band, *freq;
-	struct iwinfo_freqlist_entry *e = (struct iwinfo_freqlist_entry *)buf;
 
-	req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
-	if( req )
+	static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
+		[NL80211_FREQUENCY_ATTR_FREQ]         = { .type = NLA_U32  },
+		[NL80211_FREQUENCY_ATTR_DISABLED]     = { .type = NLA_FLAG },
+		[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
+		[NL80211_FREQUENCY_ATTR_NO_IBSS]      = { .type = NLA_FLAG },
+		[NL80211_FREQUENCY_ATTR_RADAR]        = { .type = NLA_FLAG },
+		[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32  },
+	};
+
+	nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
 	{
-		res = nl80211_send(req);
-		if( res && res->attr[NL80211_ATTR_WIPHY_BANDS] )
-		{
-			nla_for_each_nested(band,
-				res->attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
-			{
-				nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
-					  nla_len(band), NULL);
+		nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
+			nla_len(band), NULL);
 
-				nla_for_each_nested(freq,
-					bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
-				{
-					nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
-						nla_data(freq), nla_len(freq), NULL);
+		nla_for_each_nested(freq,
+			bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
+		{
+			nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
+				nla_data(freq), nla_len(freq), NULL);
 
-					if( !freqs[NL80211_FREQUENCY_ATTR_FREQ] ||
-					    freqs[NL80211_FREQUENCY_ATTR_DISABLED] )
-						continue;
+			if( !freqs[NL80211_FREQUENCY_ATTR_FREQ] ||
+				freqs[NL80211_FREQUENCY_ATTR_DISABLED] )
+				continue;
 
-					e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
-					e->channel = nl80211_freq2channel(e->mhz);
+			e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
+			e->channel = nl80211_freq2channel(e->mhz);
 
-					e->restricted = (
-						freqs[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] ||
-						freqs[NL80211_FREQUENCY_ATTR_NO_IBSS]      ||
-						freqs[NL80211_FREQUENCY_ATTR_RADAR]
-					) ? 1 : 0;
+			e->restricted = (
+				freqs[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] ||
+				freqs[NL80211_FREQUENCY_ATTR_NO_IBSS]      ||
+				freqs[NL80211_FREQUENCY_ATTR_RADAR]
+			) ? 1 : 0;
 
-					e++;
-					count++;
-				}
-			}
-			nl80211_free(res);
+			e++;
+			arr->count++;
 		}
+	}
+
+	return NL_SKIP;
+}
+
+int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
+{
+	struct nl80211_msg_conveyor *req;
+	struct nl80211_arraybuf arr = { .buf = buf, .count = 0 };
+
+	req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
+	if (req)
+	{
+		nl80211_cb(req, nl80211_get_freqlist_cb, &arr);
+		nl80211_send(req);
 		nl80211_free(req);
 	}
 
-	if( count > 0 )
+	if (arr.count > 0)
 	{
-		*len = count * sizeof(struct iwinfo_freqlist_entry);
+		*len = arr.count * sizeof(struct iwinfo_freqlist_entry);
 		return 0;
 	}
 
 	return -1;
 }
 
+static int nl80211_get_country_cb(struct nl_msg *msg, void *arg)
+{
+	char *buf = arg;
+	struct nlattr **attr = nl80211_parse(msg);
+
+	if (attr[NL80211_ATTR_REG_ALPHA2])
+		memcpy(buf, nla_data(attr[NL80211_ATTR_REG_ALPHA2]), 2);
+	else
+		buf[0] = 0;
+
+	return NL_SKIP;
+}
+
 int nl80211_get_country(const char *ifname, char *buf)
 {
 	int rv = -1;
-	struct nl80211_msg_conveyor *req, *res;
+	struct nl80211_msg_conveyor *req;
 
 	req = nl80211_msg(ifname, NL80211_CMD_GET_REG, 0);
-	if( req )
+	if (req)
 	{
-		res = nl80211_send(req);
-		if( res )
-		{
-			if( res->attr[NL80211_ATTR_REG_ALPHA2] )
-			{
-				memcpy(buf, nla_data(res->attr[NL80211_ATTR_REG_ALPHA2]), 2);
-				rv = 0;
-			}
-			nl80211_free(res);
-		}
+		nl80211_cb(req, nl80211_get_country_cb, buf);
+		nl80211_send(req);
 		nl80211_free(req);
+
+		if (buf[0])
+			rv = 0;
 	}
 
 	return rv;
@@ -1524,56 +1554,66 @@ int nl80211_get_countrylist(const char *ifname, char *buf, int *len)
 	return 0;
 }
 
-int nl80211_get_hwmodelist(const char *ifname, int *buf)
+static int nl80211_get_hwmodelist_cb(struct nl_msg *msg, void *arg)
 {
+	int *modes = arg;
 	int bands_remain, freqs_remain;
-	struct nl80211_msg_conveyor *req, *res;
+	uint16_t caps = 0;
+	struct nlattr **attr = nl80211_parse(msg);
 	struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
 	struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
 	struct nlattr *band, *freq;
-	uint16_t caps = 0;
 
-	req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
-	if( req )
+	*modes = 0;
+
+	if (attr[NL80211_ATTR_WIPHY_BANDS])
 	{
-		res = nl80211_send(req);
-		if( res && res->attr[NL80211_ATTR_WIPHY_BANDS] )
+		nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
 		{
-			nla_for_each_nested(band,
-				res->attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
-			{
-				nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
-					  nla_len(band), NULL);
+			nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
+				nla_len(band), NULL);
 
-				if( bands[NL80211_BAND_ATTR_HT_CAPA] )
-					caps = nla_get_u16(bands[NL80211_BAND_ATTR_HT_CAPA]);
+			if (bands[NL80211_BAND_ATTR_HT_CAPA])
+				caps = nla_get_u16(bands[NL80211_BAND_ATTR_HT_CAPA]);
 
-				/* Treat any nonzero capability as 11n */
-				if( caps > 0 )
-					*buf |= IWINFO_80211_N;
+			/* Treat any nonzero capability as 11n */
+			if (caps > 0)
+				*modes |= IWINFO_80211_N;
 
-				nla_for_each_nested(freq,
-					bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
-				{
-					nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
-						nla_data(freq), nla_len(freq), NULL);
+			nla_for_each_nested(freq,
+				bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
+			{
+				nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
+					nla_data(freq), nla_len(freq), NULL);
 
-					if( !freqs[NL80211_FREQUENCY_ATTR_FREQ] )
-						continue;
+				if (!freqs[NL80211_FREQUENCY_ATTR_FREQ])
+					continue;
 
-					if( nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]) < 2485 )
-					{
-						*buf |= IWINFO_80211_B;
-						*buf |= IWINFO_80211_G;
-					}
-					else
-					{
-						*buf |= IWINFO_80211_A;
-					}
+				if (nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]) < 2485)
+				{
+					*modes |= IWINFO_80211_B;
+					*modes |= IWINFO_80211_G;
+				}
+				else
+				{
+					*modes |= IWINFO_80211_A;
 				}
 			}
-			nl80211_free(res);
 		}
+	}
+
+	return NL_SKIP;
+}
+
+int nl80211_get_hwmodelist(const char *ifname, int *buf)
+{
+	struct nl80211_msg_conveyor *req;
+
+	req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
+	if (req)
+	{
+		nl80211_cb(req, nl80211_get_hwmodelist_cb, buf);
+		nl80211_send(req);
 		nl80211_free(req);
 	}
 
@@ -1585,7 +1625,7 @@ int nl80211_get_mbssid_support(const char *ifname, int *buf)
 	/* Test whether we can create another interface */
 	char *nif = nl80211_ifadd(ifname);
 
-	if( nif )
+	if (nif)
 	{
 		*buf = (iwinfo_ifmac(nif) && iwinfo_ifup(nif));
 
diff --git a/contrib/package/iwinfo/src/iwinfo_nl80211.h b/contrib/package/iwinfo/src/iwinfo_nl80211.h
index 7f6ffeaaa..edad085b4 100644
--- a/contrib/package/iwinfo/src/iwinfo_nl80211.h
+++ b/contrib/package/iwinfo/src/iwinfo_nl80211.h
@@ -45,8 +45,6 @@ struct nl80211_msg_conveyor {
 	int custom_cb;
 	struct nl_msg *msg;
 	struct nl_cb *cb;
-	struct genlmsghdr *hdr;
-	struct nlattr *attr[NL80211_ATTR_MAX + 1];
 };
 
 struct nl80211_rssi_rate {
@@ -60,6 +58,11 @@ struct nl80211_assoc_count {
 	int count;
 };
 
+struct nl80211_arraybuf {
+	void *buf;
+	int count;
+};
+
 int nl80211_probe(const char *ifname);
 int nl80211_get_mode(const char *ifname, char *buf);
 int nl80211_get_ssid(const char *ifname, char *buf);