mesh.c - platform/external/iw - Gitiles

 #include <net/if.h>
 #include <errno.h>
 #include <string.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"

 SECTION(mesh);


 typedef struct _any_t {
 	union {
 		uint32_t as_32;
 		int32_t as_s32;
 		uint16_t as_16;
 		uint8_t as_8;
 	} u;
 } _any;

 /* describes a mesh parameter */
 struct mesh_param_descr {
 	const char *name;
 	enum nl80211_meshconf_params mesh_param_num;
 	int (*nla_put_fn)(struct nl_msg*, int, _any*);
 	uint32_t (*parse_fn)(const char*, _any*);
 	void (*nla_print_fn)(struct nlattr *);
 };

 /* utility functions for manipulating and printing u8/u16/u32 values and
  * timesouts. */
 static int _my_nla_put_u8(struct nl_msg *n, int mesh_param_num, _any *value)
 {
 	return nla_put(n, mesh_param_num, sizeof(uint8_t), &value->u.as_8);
 }

 static int _my_nla_put_u16(struct nl_msg *n, int mesh_param_num, _any *value)
 {
 	return nla_put(n, mesh_param_num, sizeof(uint16_t), &value->u.as_16);
 }

 static int _my_nla_put_u32(struct nl_msg *n, int mesh_param_num, _any *value)
 {
 	return nla_put(n, mesh_param_num, sizeof(uint32_t), &value->u.as_32);
 }

 static uint32_t _parse_u8(const char *str, _any *ret)
 {
 	char *endptr = NULL;
 	unsigned long int v = strtoul(str, &endptr, 10);
 	if (*endptr != '\0')
 		return 0xff;
 	if (v > 0xff)
 		return 0xff;
 	ret->u.as_8 = (uint8_t)v;
 	return 0;
 }

 static uint32_t _parse_u8_as_bool(const char *str, _any *ret)
 {
 	char *endptr = NULL;
 	unsigned long int v = strtoul(str, &endptr, 10);
 	if (*endptr != '\0')
 		return 0x1;
 	if (v > 0x1)
 		return 0x1;
 	ret->u.as_8 = (uint8_t)v;
 	return 0;
 }

 static uint32_t _parse_u16(const char *str, _any *ret)
 {
 	char *endptr = NULL;
 	long int v = strtol(str, &endptr, 10);
 	if (*endptr != '\0')
 		return 0xffff;
 	if ((v < 0) || (v > 0xffff))
 		return 0xffff;
 	ret->u.as_16 = (uint16_t)v;
 	return 0;
 }

 static uint32_t _parse_u32(const char *str, _any *ret)
 {
 	char *endptr = NULL;
 	long long int v = strtoll(str, &endptr, 10);
 	if (*endptr != '\0')
 		return 0xffffffff;
 	if ((v < 0) || (v > 0xffffffff))
 		return 0xffffffff;
 	ret->u.as_32 = (uint32_t)v;
 	return 0;
 }

 static uint32_t _parse_s32(const char *str, _any *ret)
 {
 	char *endptr = NULL;
 	long int v = strtol(str, &endptr, 10);
 	if (*endptr != '\0')
 		return 0xffffffff;
 	if (v > 0xff)
 		return 0xffffffff;
 	ret->u.as_s32 = (int32_t)v;
 	return 0;
 }


 static void _print_u8(struct nlattr *a)
 {
 	printf("%d", nla_get_u8(a));
 }

 static void _print_u16(struct nlattr *a)
 {
 	printf("%d", nla_get_u16(a));
 }

 static void _print_u16_timeout(struct nlattr *a)
 {
 	printf("%d milliseconds", nla_get_u16(a));
 }

 static void _print_u16_in_TUs(struct nlattr *a)
 {
 	printf("%d TUs", nla_get_u16(a));
 }

 static void _print_u32(struct nlattr *a)
 {
 	printf("%d", nla_get_u32(a));
 }

 static void _print_u32_timeout(struct nlattr *a)
 {
 	printf("%u milliseconds", nla_get_u32(a));
 }

 static void _print_u32_in_TUs(struct nlattr *a)
 {
 	printf("%d TUs", nla_get_u32(a));
 }

 static void _print_s32_in_dBm(struct nlattr *a)
 {
 	printf("%d dBm", (int32_t) nla_get_u32(a));
 }


 /* The current mesh parameters */
 const static struct mesh_param_descr _mesh_param_descrs[] =
 {
 	{"mesh_retry_timeout",
 	NL80211_MESHCONF_RETRY_TIMEOUT,
 	_my_nla_put_u16, _parse_u16, _print_u16_timeout},
 	{"mesh_confirm_timeout",
 	NL80211_MESHCONF_CONFIRM_TIMEOUT,
 	_my_nla_put_u16, _parse_u16, _print_u16_timeout},
 	{"mesh_holding_timeout",
 	NL80211_MESHCONF_HOLDING_TIMEOUT,
 	_my_nla_put_u16, _parse_u16, _print_u16_timeout},
 	{"mesh_max_peer_links",
 	NL80211_MESHCONF_MAX_PEER_LINKS,
 	_my_nla_put_u16, _parse_u16, _print_u16},
 	{"mesh_max_retries",
 	NL80211_MESHCONF_MAX_RETRIES,
 	_my_nla_put_u8, _parse_u8, _print_u8},
 	{"mesh_ttl",
 	NL80211_MESHCONF_TTL,
 	_my_nla_put_u8, _parse_u8, _print_u8},
 	{"mesh_element_ttl",
 	NL80211_MESHCONF_ELEMENT_TTL,
 	_my_nla_put_u8, _parse_u8, _print_u8},
 	{"mesh_auto_open_plinks",
 	NL80211_MESHCONF_AUTO_OPEN_PLINKS,
 	_my_nla_put_u8, _parse_u8_as_bool, _print_u8},
 	{"mesh_hwmp_max_preq_retries",
 	NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
 	_my_nla_put_u8, _parse_u8, _print_u8},
 	{"mesh_path_refresh_time",
 	NL80211_MESHCONF_PATH_REFRESH_TIME,
 	_my_nla_put_u32, _parse_u32, _print_u32_timeout},
 	{"mesh_min_discovery_timeout",
 	NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
 	_my_nla_put_u16, _parse_u16, _print_u16_timeout},
 	{"mesh_hwmp_active_path_timeout",
 	NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
 	_my_nla_put_u32, _parse_u32, _print_u32_in_TUs},
 	{"mesh_hwmp_preq_min_interval",
 	NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
 	_my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 	{"mesh_hwmp_net_diameter_traversal_time",
 	NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
 	_my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 	{"mesh_hwmp_rootmode", NL80211_MESHCONF_HWMP_ROOTMODE,
 	_my_nla_put_u8, _parse_u8, _print_u8},
 	{"mesh_hwmp_rann_interval", NL80211_MESHCONF_HWMP_RANN_INTERVAL,
 	_my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 	{"mesh_gate_announcements", NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
 	_my_nla_put_u8, _parse_u8, _print_u8},
 	{"mesh_fwding", NL80211_MESHCONF_FORWARDING,
 	_my_nla_put_u8, _parse_u8_as_bool, _print_u8},
 	{"mesh_sync_offset_max_neighor",
 	NL80211_MESHCONF_SYNC_OFFSET_MAX_NEIGHBOR,
 	_my_nla_put_u32, _parse_u32, _print_u32},
 	{"mesh_rssi_threshold", NL80211_MESHCONF_RSSI_THRESHOLD,
 	_my_nla_put_u32, _parse_s32, _print_s32_in_dBm},
 	{"mesh_hwmp_active_path_to_root_timeout",
 	NL80211_MESHCONF_HWMP_PATH_TO_ROOT_TIMEOUT,
 	_my_nla_put_u32, _parse_u32, _print_u32_in_TUs},
 	{"mesh_hwmp_root_interval", NL80211_MESHCONF_HWMP_ROOT_INTERVAL,
 	_my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 	{"mesh_hwmp_confirmation_interval",
 	NL80211_MESHCONF_HWMP_CONFIRMATION_INTERVAL,
 	_my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 };

 static void print_all_mesh_param_descr(void)
 {
 	int i;

 	printf("Possible mesh parameters are:\n");

 	for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++)
 		printf(" - %s\n", _mesh_param_descrs[i].name);
 }

 static const struct mesh_param_descr *find_mesh_param(const char *name)
 {
 	int i;

 	/* Find out what mesh parameter we want to change. */
 	for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
 		if (strcmp(_mesh_param_descrs[i].name, name) == 0)
 			return _mesh_param_descrs + i;
 	}

 	print_all_mesh_param_descr();
 	return NULL;
 }

 /* Setter */
 static int set_interface_meshparam(struct nl80211_state *state,
 				   struct nl_cb *cb,
 				   struct nl_msg *msg,
 				   int argc, char **argv,
 				   enum id_input id)
 {
 	const struct mesh_param_descr *mdescr;
 	struct nlattr *container;
 	uint32_t ret;
 	int err;

 	container = nla_nest_start(msg, NL80211_ATTR_MESH_PARAMS);
 	if (!container)
 		return -ENOBUFS;

 	if (!argc)
 		return 1;

 	while (argc) {
 		const char *name;
 		char *value;
 		_any any;

 		memset(&any, 0, sizeof(_any));

 		name = argv[0];
 		value = strchr(name, '=');
 		if (value) {
 			*value = '\0';
 			value++;
 			argc--;
 			argv++;
 		} else {
 			/* backward compat -- accept w/o '=' */
 			if (argc < 2) {
 				printf("Must specify a value for %s.\n", name);
 				return 2;
 			}
 			value = argv[1];
 			argc -= 2;
 			argv += 2;
 		}

 		mdescr = find_mesh_param(name);
 		if (!mdescr)
 			return 2;

 		/* Parse the new value */
 		ret = mdescr->parse_fn(value, &any);
 		if (ret != 0) {
 			printf("%s must be set to a number "
 			       "between 0 and %u\n", mdescr->name, ret);
 			return 2;
 		}

 		err = mdescr->nla_put_fn(msg, mdescr->mesh_param_num, &any);
 		if (err)
 			return err;
 	}
 	nla_nest_end(msg, container);

 	return err;
 }

 COMMAND(set, mesh_param, "<param>=<value> [<param>=<value>]*",
 	NL80211_CMD_SET_MESH_PARAMS, 0, CIB_NETDEV, set_interface_meshparam,
 	"Set mesh parameter (run command without any to see available ones).");

 /* Getter */
 static int print_mesh_param_handler(struct nl_msg *msg, void *arg)
 {
 	const struct mesh_param_descr *mdescr = arg;
 	struct nlattr *attrs[NL80211_ATTR_MAX + 1];
 	struct nlattr *parent_attr;
 	struct nlattr *mesh_params[NL80211_MESHCONF_ATTR_MAX + 1];
 	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));

 	/* locate NL80211_ATTR_MESH_PARAMS */
 	nla_parse(attrs, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 		  genlmsg_attrlen(gnlh, 0), NULL);
 	parent_attr = attrs[NL80211_ATTR_MESH_PARAMS];
 	if (!parent_attr)
 		return -EINVAL;

 	/* unpack the mesh parameters */
 	if (nla_parse_nested(mesh_params, NL80211_MESHCONF_ATTR_MAX,
 			     parent_attr, NULL))
 		return -EINVAL;

 	if (!mdescr) {
 		int i;

 		for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
 			mdescr = &_mesh_param_descrs[i];
 			printf("%s = ", mdescr->name);
 			mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
 			printf("\n");
 		}
 		return NL_SKIP;
 	}

 	/* print out the mesh parameter */
 	mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
 	printf("\n");
 	return NL_SKIP;
 }

 static int get_interface_meshparam(struct nl80211_state *state,
 				   struct nl_cb *cb,
 				   struct nl_msg *msg,
 				   int argc, char **argv,
 				   enum id_input id)
 {
 	const struct mesh_param_descr *mdescr = NULL;

 	if (argc > 1)
 		return 1;

 	if (argc == 1) {
 		mdescr = find_mesh_param(argv[0]);
 		if (!mdescr)
 			return 2;
 	}

 	nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM,
 		  print_mesh_param_handler, (void *)mdescr);
 	return 0;
 }

 COMMAND(get, mesh_param, "[<param>]",
 	NL80211_CMD_GET_MESH_PARAMS, 0, CIB_NETDEV, get_interface_meshparam,
 	"Retrieve mesh parameter (run command without any to see available ones).");

 static int join_mesh(struct nl80211_state *state, struct nl_cb *cb,
 		     struct nl_msg *msg, int argc, char **argv,
 		     enum id_input id)
 {
 	struct nlattr *container;
 	float rate;
 	char *end;

 	if (argc < 1)
 		return 1;

 	NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(argv[0]), argv[0]);
 	argc--;
 	argv++;

 	if (argc > 1 && strcmp(argv[0], "mcast-rate") == 0) {
 		argv++;
 		argc--;

 		rate = strtod(argv[0], &end);
 		if (*end != '\0')
 			return 1;

 		NLA_PUT_U32(msg, NL80211_ATTR_MCAST_RATE, (int)(rate * 10));
 		argv++;
 		argc--;
 	}

 	container = nla_nest_start(msg, NL80211_ATTR_MESH_SETUP);
 	if (!container)
 		return -ENOBUFS;

 	if (argc > 1 && strcmp(argv[0], "vendor_sync") == 0) {
 		argv++;
 		argc--;
 		if (strcmp(argv[0], "on") == 0)
 			NLA_PUT_U8(msg,
 				   NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC, 1);
 		else
 			NLA_PUT_U8(msg,
 				   NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC, 0);
 		argv++;
 		argc--;
 	}
 	/* parse and put other NL80211_ATTR_MESH_SETUP elements here */

 	nla_nest_end(msg, container);

 	if (!argc)
 		return 0;
 	return set_interface_meshparam(state, cb, msg, argc, argv, id);
  nla_put_failure:
 	return -ENOBUFS;
 }
 COMMAND(mesh, join, "<mesh ID> [mcast-rate <rate in Mbps>] [vendor_sync on|off]"
 	" [<param>=<value>]*",
 	NL80211_CMD_JOIN_MESH, 0, CIB_NETDEV, join_mesh,
 	"Join a mesh with the given mesh ID with mcast-rate and mesh parameters.");

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

 	return 0;
 }
 COMMAND(mesh, leave, NULL, NL80211_CMD_LEAVE_MESH, 0, CIB_NETDEV, leave_mesh,
 	"Leave a mesh.");
	#include <net/if.h>
	#include <errno.h>
	#include <string.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"

	SECTION(mesh);


	typedef struct _any_t {
	union {
	uint32_t as_32;
	int32_t as_s32;
	uint16_t as_16;
	uint8_t as_8;
	} u;
	} _any;

	/* describes a mesh parameter */
	struct mesh_param_descr {
	const char *name;
	enum nl80211_meshconf_params mesh_param_num;
	int (nla_put_fn)(struct nl_msg, int, _any*);
	uint32_t (parse_fn)(const char, _any*);
	void (nla_print_fn)(struct nlattr );
	};

	/* utility functions for manipulating and printing u8/u16/u32 values and
	* timesouts. */
	static int _my_nla_put_u8(struct nl_msg n, int mesh_param_num, _any value)
	{
	return nla_put(n, mesh_param_num, sizeof(uint8_t), &value->u.as_8);
	}

	static int _my_nla_put_u16(struct nl_msg n, int mesh_param_num, _any value)
	{
	return nla_put(n, mesh_param_num, sizeof(uint16_t), &value->u.as_16);
	}

	static int _my_nla_put_u32(struct nl_msg n, int mesh_param_num, _any value)
	{
	return nla_put(n, mesh_param_num, sizeof(uint32_t), &value->u.as_32);
	}

	static uint32_t _parse_u8(const char str, _any ret)
	{
	char *endptr = NULL;
	unsigned long int v = strtoul(str, &endptr, 10);
	if (*endptr != '\0')
	return 0xff;
	if (v > 0xff)
	return 0xff;
	ret->u.as_8 = (uint8_t)v;
	return 0;
	}

	static uint32_t _parse_u8_as_bool(const char str, _any ret)
	{
	char *endptr = NULL;
	unsigned long int v = strtoul(str, &endptr, 10);
	if (*endptr != '\0')
	return 0x1;
	if (v > 0x1)
	return 0x1;
	ret->u.as_8 = (uint8_t)v;
	return 0;
	}

	static uint32_t _parse_u16(const char str, _any ret)
	{
	char *endptr = NULL;
	long int v = strtol(str, &endptr, 10);
	if (*endptr != '\0')
	return 0xffff;
	if ((v < 0) \|\| (v > 0xffff))
	return 0xffff;
	ret->u.as_16 = (uint16_t)v;
	return 0;
	}

	static uint32_t _parse_u32(const char str, _any ret)
	{
	char *endptr = NULL;
	long long int v = strtoll(str, &endptr, 10);
	if (*endptr != '\0')
	return 0xffffffff;
	if ((v < 0) \|\| (v > 0xffffffff))
	return 0xffffffff;
	ret->u.as_32 = (uint32_t)v;
	return 0;
	}

	static uint32_t _parse_s32(const char str, _any ret)
	{
	char *endptr = NULL;
	long int v = strtol(str, &endptr, 10);
	if (*endptr != '\0')
	return 0xffffffff;
	if (v > 0xff)
	return 0xffffffff;
	ret->u.as_s32 = (int32_t)v;
	return 0;
	}


	static void _print_u8(struct nlattr *a)
	{
	printf("%d", nla_get_u8(a));
	}

	static void _print_u16(struct nlattr *a)
	{
	printf("%d", nla_get_u16(a));
	}

	static void _print_u16_timeout(struct nlattr *a)
	{
	printf("%d milliseconds", nla_get_u16(a));
	}

	static void _print_u16_in_TUs(struct nlattr *a)
	{
	printf("%d TUs", nla_get_u16(a));
	}

	static void _print_u32(struct nlattr *a)
	{
	printf("%d", nla_get_u32(a));
	}

	static void _print_u32_timeout(struct nlattr *a)
	{
	printf("%u milliseconds", nla_get_u32(a));
	}

	static void _print_u32_in_TUs(struct nlattr *a)
	{
	printf("%d TUs", nla_get_u32(a));
	}

	static void _print_s32_in_dBm(struct nlattr *a)
	{
	printf("%d dBm", (int32_t) nla_get_u32(a));
	}


	/* The current mesh parameters */
	const static struct mesh_param_descr _mesh_param_descrs[] =
	{
	{"mesh_retry_timeout",
	NL80211_MESHCONF_RETRY_TIMEOUT,
	_my_nla_put_u16, _parse_u16, _print_u16_timeout},
	{"mesh_confirm_timeout",
	NL80211_MESHCONF_CONFIRM_TIMEOUT,
	_my_nla_put_u16, _parse_u16, _print_u16_timeout},
	{"mesh_holding_timeout",
	NL80211_MESHCONF_HOLDING_TIMEOUT,
	_my_nla_put_u16, _parse_u16, _print_u16_timeout},
	{"mesh_max_peer_links",
	NL80211_MESHCONF_MAX_PEER_LINKS,
	_my_nla_put_u16, _parse_u16, _print_u16},
	{"mesh_max_retries",
	NL80211_MESHCONF_MAX_RETRIES,
	_my_nla_put_u8, _parse_u8, _print_u8},
	{"mesh_ttl",
	NL80211_MESHCONF_TTL,
	_my_nla_put_u8, _parse_u8, _print_u8},
	{"mesh_element_ttl",
	NL80211_MESHCONF_ELEMENT_TTL,
	_my_nla_put_u8, _parse_u8, _print_u8},
	{"mesh_auto_open_plinks",
	NL80211_MESHCONF_AUTO_OPEN_PLINKS,
	_my_nla_put_u8, _parse_u8_as_bool, _print_u8},
	{"mesh_hwmp_max_preq_retries",
	NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
	_my_nla_put_u8, _parse_u8, _print_u8},
	{"mesh_path_refresh_time",
	NL80211_MESHCONF_PATH_REFRESH_TIME,
	_my_nla_put_u32, _parse_u32, _print_u32_timeout},
	{"mesh_min_discovery_timeout",
	NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
	_my_nla_put_u16, _parse_u16, _print_u16_timeout},
	{"mesh_hwmp_active_path_timeout",
	NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
	_my_nla_put_u32, _parse_u32, _print_u32_in_TUs},
	{"mesh_hwmp_preq_min_interval",
	NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
	_my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
	{"mesh_hwmp_net_diameter_traversal_time",
	NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
	_my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
	{"mesh_hwmp_rootmode", NL80211_MESHCONF_HWMP_ROOTMODE,
	_my_nla_put_u8, _parse_u8, _print_u8},
	{"mesh_hwmp_rann_interval", NL80211_MESHCONF_HWMP_RANN_INTERVAL,
	_my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
	{"mesh_gate_announcements", NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
	_my_nla_put_u8, _parse_u8, _print_u8},
	{"mesh_fwding", NL80211_MESHCONF_FORWARDING,
	_my_nla_put_u8, _parse_u8_as_bool, _print_u8},
	{"mesh_sync_offset_max_neighor",
	NL80211_MESHCONF_SYNC_OFFSET_MAX_NEIGHBOR,
	_my_nla_put_u32, _parse_u32, _print_u32},
	{"mesh_rssi_threshold", NL80211_MESHCONF_RSSI_THRESHOLD,
	_my_nla_put_u32, _parse_s32, _print_s32_in_dBm},
	{"mesh_hwmp_active_path_to_root_timeout",
	NL80211_MESHCONF_HWMP_PATH_TO_ROOT_TIMEOUT,
	_my_nla_put_u32, _parse_u32, _print_u32_in_TUs},
	{"mesh_hwmp_root_interval", NL80211_MESHCONF_HWMP_ROOT_INTERVAL,
	_my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
	{"mesh_hwmp_confirmation_interval",
	NL80211_MESHCONF_HWMP_CONFIRMATION_INTERVAL,
	_my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
	};

	static void print_all_mesh_param_descr(void)
	{
	int i;

	printf("Possible mesh parameters are:\n");

	for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++)
	printf(" - %s\n", _mesh_param_descrs[i].name);
	}

	static const struct mesh_param_descr find_mesh_param(const char name)
	{
	int i;

	/* Find out what mesh parameter we want to change. */
	for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
	if (strcmp(_mesh_param_descrs[i].name, name) == 0)
	return _mesh_param_descrs + i;
	}

	print_all_mesh_param_descr();
	return NULL;
	}

	/* Setter */
	static int set_interface_meshparam(struct nl80211_state *state,
	struct nl_cb *cb,
	struct nl_msg *msg,
	int argc, char **argv,
	enum id_input id)
	{
	const struct mesh_param_descr *mdescr;
	struct nlattr *container;
	uint32_t ret;
	int err;

	container = nla_nest_start(msg, NL80211_ATTR_MESH_PARAMS);
	if (!container)
	return -ENOBUFS;

	if (!argc)
	return 1;

	while (argc) {
	const char *name;
	char *value;
	_any any;

	memset(&any, 0, sizeof(_any));

	name = argv[0];
	value = strchr(name, '=');
	if (value) {
	*value = '\0';
	value++;
	argc--;
	argv++;
	} else {
	/* backward compat -- accept w/o '=' */
	if (argc < 2) {
	printf("Must specify a value for %s.\n", name);
	return 2;
	}
	value = argv[1];
	argc -= 2;
	argv += 2;
	}

	mdescr = find_mesh_param(name);
	if (!mdescr)
	return 2;

	/* Parse the new value */
	ret = mdescr->parse_fn(value, &any);
	if (ret != 0) {
	printf("%s must be set to a number "
	"between 0 and %u\n", mdescr->name, ret);
	return 2;
	}

	err = mdescr->nla_put_fn(msg, mdescr->mesh_param_num, &any);
	if (err)
	return err;
	}
	nla_nest_end(msg, container);

	return err;
	}

	COMMAND(set, mesh_param, "<param>=<value> [<param>=<value>]*",
	NL80211_CMD_SET_MESH_PARAMS, 0, CIB_NETDEV, set_interface_meshparam,
	"Set mesh parameter (run command without any to see available ones).");

	/* Getter */
	static int print_mesh_param_handler(struct nl_msg msg, void arg)
	{
	const struct mesh_param_descr *mdescr = arg;
	struct nlattr *attrs[NL80211_ATTR_MAX + 1];
	struct nlattr *parent_attr;
	struct nlattr *mesh_params[NL80211_MESHCONF_ATTR_MAX + 1];
	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));

	/* locate NL80211_ATTR_MESH_PARAMS */
	nla_parse(attrs, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
	genlmsg_attrlen(gnlh, 0), NULL);
	parent_attr = attrs[NL80211_ATTR_MESH_PARAMS];
	if (!parent_attr)
	return -EINVAL;

	/* unpack the mesh parameters */
	if (nla_parse_nested(mesh_params, NL80211_MESHCONF_ATTR_MAX,
	parent_attr, NULL))
	return -EINVAL;

	if (!mdescr) {
	int i;

	for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
	mdescr = &_mesh_param_descrs[i];
	printf("%s = ", mdescr->name);
	mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
	printf("\n");
	}
	return NL_SKIP;
	}

	/* print out the mesh parameter */
	mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
	printf("\n");
	return NL_SKIP;
	}

	static int get_interface_meshparam(struct nl80211_state *state,
	struct nl_cb *cb,
	struct nl_msg *msg,
	int argc, char **argv,
	enum id_input id)
	{
	const struct mesh_param_descr *mdescr = NULL;

	if (argc > 1)
	return 1;

	if (argc == 1) {
	mdescr = find_mesh_param(argv[0]);
	if (!mdescr)
	return 2;
	}

	nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM,
	print_mesh_param_handler, (void *)mdescr);
	return 0;
	}

	COMMAND(get, mesh_param, "[<param>]",
	NL80211_CMD_GET_MESH_PARAMS, 0, CIB_NETDEV, get_interface_meshparam,
	"Retrieve mesh parameter (run command without any to see available ones).");

	static int join_mesh(struct nl80211_state state, struct nl_cb cb,
	struct nl_msg msg, int argc, char *argv,
	enum id_input id)
	{
	struct nlattr *container;
	float rate;
	char *end;

	if (argc < 1)
	return 1;

	NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(argv[0]), argv[0]);
	argc--;
	argv++;

	if (argc > 1 && strcmp(argv[0], "mcast-rate") == 0) {
	argv++;
	argc--;

	rate = strtod(argv[0], &end);
	if (*end != '\0')
	return 1;

	NLA_PUT_U32(msg, NL80211_ATTR_MCAST_RATE, (int)(rate * 10));
	argv++;
	argc--;
	}

	container = nla_nest_start(msg, NL80211_ATTR_MESH_SETUP);
	if (!container)
	return -ENOBUFS;

	if (argc > 1 && strcmp(argv[0], "vendor_sync") == 0) {
	argv++;
	argc--;
	if (strcmp(argv[0], "on") == 0)
	NLA_PUT_U8(msg,
	NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC, 1);
	else
	NLA_PUT_U8(msg,
	NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC, 0);
	argv++;
	argc--;
	}
	/* parse and put other NL80211_ATTR_MESH_SETUP elements here */

	nla_nest_end(msg, container);

	if (!argc)
	return 0;
	return set_interface_meshparam(state, cb, msg, argc, argv, id);
	nla_put_failure:
	return -ENOBUFS;
	}
	COMMAND(mesh, join, "<mesh ID> [mcast-rate <rate in Mbps>] [vendor_sync on\|off]"
	" [<param>=<value>]*",
	NL80211_CMD_JOIN_MESH, 0, CIB_NETDEV, join_mesh,
	"Join a mesh with the given mesh ID with mcast-rate and mesh parameters.");

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

	return 0;
	}
	COMMAND(mesh, leave, NULL, NL80211_CMD_LEAVE_MESH, 0, CIB_NETDEV, leave_mesh,
	"Leave a mesh.");