ip/iplink_macvlan.c - pub/scm/network/iproute2/iproute2-next - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * iplink_macvlan.c	macvlan/macvtap device support
  *
  * Authors:     Patrick McHardy <kaber@trash.net>
  *		Arnd Bergmann <arnd@arndb.de>
  */

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/socket.h>
 #include <linux/if_link.h>
 #include <linux/if_ether.h>

 #include "rt_names.h"
 #include "utils.h"
 #include "ip_common.h"

 #define pfx_err(lu, ...) {               \
 	fprintf(stderr, "%s: ", lu->id); \
 	fprintf(stderr, __VA_ARGS__);    \
 	fprintf(stderr, "\n");           \
 }

 static void print_explain(struct link_util *lu, FILE *f)
 {
 	fprintf(f,
 		"Usage: ... %s mode MODE [flag MODE_FLAG] MODE_OPTS [bcqueuelen BC_QUEUE_LEN] [bclim BCLIM]\n"
 		"\n"
 		"MODE: private | vepa | bridge | passthru | source\n"
 		"MODE_FLAG: null | nopromisc | nodst\n"
 		"MODE_OPTS: for mode \"source\":\n"
 		"\tmacaddr { { add | del } <macaddr> | set [ <macaddr> [ <macaddr>  ... ] ] | flush }\n"
 		"BC_QUEUE_LEN: Length of the rx queue for broadcast/multicast: [0-4294967295]\n"
 		"BCLIM: Threshold for broadcast queueing: 32-bit integer\n",
 		lu->id
 	);
 }

 static void explain(struct link_util *lu)
 {
 	print_explain(lu, stderr);
 }


 static int mode_arg(const char *arg)
 {
 	fprintf(stderr,
 		"Error: argument of \"mode\" must be \"private\", \"vepa\", \"bridge\", \"passthru\" or \"source\", not \"%s\"\n",
 		arg);
 	return -1;
 }

 static int flag_arg(const char *arg)
 {
 	fprintf(stderr,
 		"Error: argument of \"flag\" must be \"nopromisc\", \"nodst\" or \"null\", not \"%s\"\n",
 		arg);
 	return -1;
 }

 static int bc_queue_len_arg(const char *arg)
 {
 	fprintf(stderr,
 		"Error: argument of \"bcqueuelen\" must be a positive integer [0-4294967295], not \"%s\"\n",
 		arg);
 	return -1;
 }

 static int bclim_arg(const char *arg)
 {
 	fprintf(stderr, "Error: illegal value for \"bclim\": \"%s\"\n", arg);
 	return -1;
 }

 static int macvlan_parse_opt(struct link_util *lu, int argc, char **argv,
 			  struct nlmsghdr *n)
 {
 	__u32 mode = 0;
 	__u16 flags = 0;
 	__u32 mac_mode = 0;
 	int has_flags = 0;
 	char mac[ETH_ALEN];
 	struct rtattr *nmac;

 	while (argc > 0) {
 		if (matches(*argv, "mode") == 0) {
 			NEXT_ARG();

 			if (strcmp(*argv, "private") == 0)
 				mode = MACVLAN_MODE_PRIVATE;
 			else if (strcmp(*argv, "vepa") == 0)
 				mode = MACVLAN_MODE_VEPA;
 			else if (strcmp(*argv, "bridge") == 0)
 				mode = MACVLAN_MODE_BRIDGE;
 			else if (strcmp(*argv, "passthru") == 0)
 				mode = MACVLAN_MODE_PASSTHRU;
 			else if (strcmp(*argv, "source") == 0)
 				mode = MACVLAN_MODE_SOURCE;
 			else
 				return mode_arg(*argv);
 		} else if (matches(*argv, "flag") == 0) {
 			NEXT_ARG();

 			if (strcmp(*argv, "nopromisc") == 0)
 				flags |= MACVLAN_FLAG_NOPROMISC;
 			else if (strcmp(*argv, "nodst") == 0)
 				flags |= MACVLAN_FLAG_NODST;
 			else if (strcmp(*argv, "null") == 0)
 				flags |= 0;
 			else
 				return flag_arg(*argv);

 			has_flags = 1;

 		} else if (matches(*argv, "macaddr") == 0) {
 			NEXT_ARG();

 			if (strcmp(*argv, "add") == 0) {
 				mac_mode = MACVLAN_MACADDR_ADD;
 			} else if (strcmp(*argv, "del") == 0) {
 				mac_mode = MACVLAN_MACADDR_DEL;
 			} else if (strcmp(*argv, "set") == 0) {
 				mac_mode = MACVLAN_MACADDR_SET;
 			} else if (strcmp(*argv, "flush") == 0) {
 				mac_mode = MACVLAN_MACADDR_FLUSH;
 			} else {
 				explain(lu);
 				return -1;
 			}

 			addattr32(n, 1024, IFLA_MACVLAN_MACADDR_MODE, mac_mode);

 			if (mac_mode == MACVLAN_MACADDR_ADD ||
 			    mac_mode == MACVLAN_MACADDR_DEL) {
 				NEXT_ARG();

 				if (ll_addr_a2n(mac, sizeof(mac),
 						*argv) != ETH_ALEN)
 					return -1;

 				addattr_l(n, 1024, IFLA_MACVLAN_MACADDR, &mac,
 					  ETH_ALEN);
 			}

 			if (mac_mode == MACVLAN_MACADDR_SET) {
 				nmac = addattr_nest(n, 1024,
 						    IFLA_MACVLAN_MACADDR_DATA);
 				while (NEXT_ARG_OK()) {
 					NEXT_ARG_FWD();

 					if (ll_addr_a2n(mac, sizeof(mac),
 							*argv) != ETH_ALEN) {
 						PREV_ARG();
 						break;
 					}

 					addattr_l(n, 1024, IFLA_MACVLAN_MACADDR,
 						  &mac, ETH_ALEN);
 				}
 				addattr_nest_end(n, nmac);
 			}
 		} else if (matches(*argv, "nopromisc") == 0) {
 			flags |= MACVLAN_FLAG_NOPROMISC;
 			has_flags = 1;
 		} else if (matches(*argv, "nodst") == 0) {
 			flags |= MACVLAN_FLAG_NODST;
 			has_flags = 1;
 		} else if (matches(*argv, "bcqueuelen") == 0) {
 			__u32 bc_queue_len;
 			NEXT_ARG();

 			if (get_u32(&bc_queue_len, *argv, 0)) {
 				return bc_queue_len_arg(*argv);
 			}
 			addattr32(n, 1024, IFLA_MACVLAN_BC_QUEUE_LEN, bc_queue_len);
 		} else if (!strcmp(*argv, "bclim")) {
 			__s32 bclim;
 			NEXT_ARG();

 			if (get_s32(&bclim, *argv, 0)) {
 				return bclim_arg(*argv);
 			}
 			addattr_l(n, 1024, IFLA_MACVLAN_BC_CUTOFF,
 				  &bclim, sizeof(bclim));
 		} else if (matches(*argv, "help") == 0) {
 			explain(lu);
 			return -1;
 		} else {
 			pfx_err(lu, "unknown option \"%s\"?", *argv);
 			explain(lu);
 			return -1;
 		}
 		argc--, argv++;
 	}

 	if (mode)
 		addattr32(n, 1024, IFLA_MACVLAN_MODE, mode);

 	if (has_flags) {
 		if (flags & MACVLAN_FLAG_NOPROMISC &&
 		    mode != MACVLAN_MODE_PASSTHRU) {
 			pfx_err(lu, "nopromisc flag only valid in passthru mode");
 			explain(lu);
 			return -1;
 		}
 		addattr16(n, 1024, IFLA_MACVLAN_FLAGS, flags);
 	}
 	return 0;
 }

 static void macvlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 {
 	__u32 mode;
 	__u16 flags;
 	__u32 count;
 	unsigned char *addr;
 	int len;
 	struct rtattr *rta;

 	if (!tb)
 		return;

 	if (!tb[IFLA_MACVLAN_MODE] ||
 	    RTA_PAYLOAD(tb[IFLA_MACVLAN_MODE]) < sizeof(__u32))
 		return;

 	mode = rta_getattr_u32(tb[IFLA_MACVLAN_MODE]);
 	print_string(PRINT_ANY,
 		     "mode",
 		     "mode %s ",
 		     mode == MACVLAN_MODE_PRIVATE ? "private"
 		     : mode == MACVLAN_MODE_VEPA    ? "vepa"
 		     : mode == MACVLAN_MODE_BRIDGE  ? "bridge"
 		     : mode == MACVLAN_MODE_PASSTHRU  ? "passthru"
 		     : mode == MACVLAN_MODE_SOURCE  ? "source"
 		     :				 "unknown");

 	if (!tb[IFLA_MACVLAN_FLAGS] ||
 	    RTA_PAYLOAD(tb[IFLA_MACVLAN_FLAGS]) < sizeof(__u16))
 		flags = 0;
 	else
 		flags = rta_getattr_u16(tb[IFLA_MACVLAN_FLAGS]);

 	if (flags & MACVLAN_FLAG_NOPROMISC)
 		print_bool(PRINT_ANY, "nopromisc", "nopromisc ", true);

 	if (flags & MACVLAN_FLAG_NODST)
 		print_bool(PRINT_ANY, "nodst", "nodst ", true);

 	if (tb[IFLA_MACVLAN_BC_QUEUE_LEN] &&
 		RTA_PAYLOAD(tb[IFLA_MACVLAN_BC_QUEUE_LEN]) >= sizeof(__u32)) {
 		__u32 bc_queue_len = rta_getattr_u32(tb[IFLA_MACVLAN_BC_QUEUE_LEN]);
 		print_luint(PRINT_ANY, "bcqueuelen", "bcqueuelen %lu ", bc_queue_len);
 	}

 	if (tb[IFLA_MACVLAN_BC_QUEUE_LEN_USED] &&
 		RTA_PAYLOAD(tb[IFLA_MACVLAN_BC_QUEUE_LEN_USED]) >= sizeof(__u32)) {
 		__u32 bc_queue_len = rta_getattr_u32(tb[IFLA_MACVLAN_BC_QUEUE_LEN_USED]);
 		print_luint(PRINT_ANY, "usedbcqueuelen", "usedbcqueuelen %lu ", bc_queue_len);
 	}

 	if (tb[IFLA_MACVLAN_BC_CUTOFF] &&
 		RTA_PAYLOAD(tb[IFLA_MACVLAN_BC_CUTOFF]) >= sizeof(__s32)) {
 		__s32 bclim = rta_getattr_s32(tb[IFLA_MACVLAN_BC_CUTOFF]);
 		print_int(PRINT_ANY, "bclim", "bclim %d ", bclim);
 	}

 	/* in source mode, there are more options to print */

 	if (mode != MACVLAN_MODE_SOURCE)
 		return;

 	if (!tb[IFLA_MACVLAN_MACADDR_COUNT] ||
 	    RTA_PAYLOAD(tb[IFLA_MACVLAN_MACADDR_COUNT]) < sizeof(__u32))
 		return;

 	count = rta_getattr_u32(tb[IFLA_MACVLAN_MACADDR_COUNT]);
 	print_int(PRINT_ANY, "macaddr_count", "remotes (%d) ", count);

 	if (!tb[IFLA_MACVLAN_MACADDR_DATA])
 		return;

 	rta = RTA_DATA(tb[IFLA_MACVLAN_MACADDR_DATA]);
 	len = RTA_PAYLOAD(tb[IFLA_MACVLAN_MACADDR_DATA]);

 	open_json_array(PRINT_JSON, "macaddr_data");
 	for (; RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
 		if (rta->rta_type != IFLA_MACVLAN_MACADDR ||
 		    RTA_PAYLOAD(rta) < 6)
 			continue;
 		addr = RTA_DATA(rta);
 		if (is_json_context()) {
 			SPRINT_BUF(b1);

 			snprintf(b1, sizeof(b1),
 				 "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", addr[0],
 				 addr[1], addr[2], addr[3], addr[4], addr[5]);
 			print_string(PRINT_JSON, NULL, NULL, b1);
 		} else {
 			fprintf(f, "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x ", addr[0],
 				addr[1], addr[2], addr[3], addr[4], addr[5]);
 		}
 	}
 	close_json_array(PRINT_JSON, NULL);
 }

 static void macvlan_print_help(struct link_util *lu, int argc, char **argv,
 			       FILE *f)
 {
 	print_explain(lu, f);
 }

 struct link_util macvlan_link_util = {
 	.id		= "macvlan",
 	.maxattr	= IFLA_MACVLAN_MAX,
 	.parse_opt	= macvlan_parse_opt,
 	.print_opt	= macvlan_print_opt,
 	.print_help	= macvlan_print_help,
 };

 struct link_util macvtap_link_util = {
 	.id		= "macvtap",
 	.maxattr	= IFLA_MACVLAN_MAX,
 	.parse_opt	= macvlan_parse_opt,
 	.print_opt	= macvlan_print_opt,
 	.print_help	= macvlan_print_help,
 };
	/* SPDX-License-Identifier: GPL-2.0-or-later */
	/*
	* iplink_macvlan.c macvlan/macvtap device support
	*
	* Authors: Patrick McHardy <kaber@trash.net>
	* Arnd Bergmann <arnd@arndb.de>
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/socket.h>
	#include <linux/if_link.h>
	#include <linux/if_ether.h>

	#include "rt_names.h"
	#include "utils.h"
	#include "ip_common.h"

	#define pfx_err(lu, ...) { \
	fprintf(stderr, "%s: ", lu->id); \
	fprintf(stderr, __VA_ARGS__); \
	fprintf(stderr, "\n"); \
	}

	static void print_explain(struct link_util lu, FILE f)
	{
	fprintf(f,
	"Usage: ... %s mode MODE [flag MODE_FLAG] MODE_OPTS [bcqueuelen BC_QUEUE_LEN] [bclim BCLIM]\n"
	"\n"
	"MODE: private \| vepa \| bridge \| passthru \| source\n"
	"MODE_FLAG: null \| nopromisc \| nodst\n"
	"MODE_OPTS: for mode \"source\":\n"
	"\tmacaddr { { add \| del } <macaddr> \| set [ <macaddr> [ <macaddr> ... ] ] \| flush }\n"
	"BC_QUEUE_LEN: Length of the rx queue for broadcast/multicast: [0-4294967295]\n"
	"BCLIM: Threshold for broadcast queueing: 32-bit integer\n",
	lu->id
	);
	}

	static void explain(struct link_util *lu)
	{
	print_explain(lu, stderr);
	}


	static int mode_arg(const char *arg)
	{
	fprintf(stderr,
	"Error: argument of \"mode\" must be \"private\", \"vepa\", \"bridge\", \"passthru\" or \"source\", not \"%s\"\n",
	arg);
	return -1;
	}

	static int flag_arg(const char *arg)
	{
	fprintf(stderr,
	"Error: argument of \"flag\" must be \"nopromisc\", \"nodst\" or \"null\", not \"%s\"\n",
	arg);
	return -1;
	}

	static int bc_queue_len_arg(const char *arg)
	{
	fprintf(stderr,
	"Error: argument of \"bcqueuelen\" must be a positive integer [0-4294967295], not \"%s\"\n",
	arg);
	return -1;
	}

	static int bclim_arg(const char *arg)
	{
	fprintf(stderr, "Error: illegal value for \"bclim\": \"%s\"\n", arg);
	return -1;
	}

	static int macvlan_parse_opt(struct link_util lu, int argc, char *argv,
	struct nlmsghdr *n)
	{
	__u32 mode = 0;
	__u16 flags = 0;
	__u32 mac_mode = 0;
	int has_flags = 0;
	char mac[ETH_ALEN];
	struct rtattr *nmac;

	while (argc > 0) {
	if (matches(*argv, "mode") == 0) {
	NEXT_ARG();

	if (strcmp(*argv, "private") == 0)
	mode = MACVLAN_MODE_PRIVATE;
	else if (strcmp(*argv, "vepa") == 0)
	mode = MACVLAN_MODE_VEPA;
	else if (strcmp(*argv, "bridge") == 0)
	mode = MACVLAN_MODE_BRIDGE;
	else if (strcmp(*argv, "passthru") == 0)
	mode = MACVLAN_MODE_PASSTHRU;
	else if (strcmp(*argv, "source") == 0)
	mode = MACVLAN_MODE_SOURCE;
	else
	return mode_arg(*argv);
	} else if (matches(*argv, "flag") == 0) {
	NEXT_ARG();

	if (strcmp(*argv, "nopromisc") == 0)
	flags \|= MACVLAN_FLAG_NOPROMISC;
	else if (strcmp(*argv, "nodst") == 0)
	flags \|= MACVLAN_FLAG_NODST;
	else if (strcmp(*argv, "null") == 0)
	flags \|= 0;
	else
	return flag_arg(*argv);

	has_flags = 1;

	} else if (matches(*argv, "macaddr") == 0) {
	NEXT_ARG();

	if (strcmp(*argv, "add") == 0) {
	mac_mode = MACVLAN_MACADDR_ADD;
	} else if (strcmp(*argv, "del") == 0) {
	mac_mode = MACVLAN_MACADDR_DEL;
	} else if (strcmp(*argv, "set") == 0) {
	mac_mode = MACVLAN_MACADDR_SET;
	} else if (strcmp(*argv, "flush") == 0) {
	mac_mode = MACVLAN_MACADDR_FLUSH;
	} else {
	explain(lu);
	return -1;
	}

	addattr32(n, 1024, IFLA_MACVLAN_MACADDR_MODE, mac_mode);

	if (mac_mode == MACVLAN_MACADDR_ADD \|\|
	mac_mode == MACVLAN_MACADDR_DEL) {
	NEXT_ARG();

	if (ll_addr_a2n(mac, sizeof(mac),
	*argv) != ETH_ALEN)
	return -1;

	addattr_l(n, 1024, IFLA_MACVLAN_MACADDR, &mac,
	ETH_ALEN);
	}

	if (mac_mode == MACVLAN_MACADDR_SET) {
	nmac = addattr_nest(n, 1024,
	IFLA_MACVLAN_MACADDR_DATA);
	while (NEXT_ARG_OK()) {
	NEXT_ARG_FWD();

	if (ll_addr_a2n(mac, sizeof(mac),
	*argv) != ETH_ALEN) {
	PREV_ARG();
	break;
	}

	addattr_l(n, 1024, IFLA_MACVLAN_MACADDR,
	&mac, ETH_ALEN);
	}
	addattr_nest_end(n, nmac);
	}
	} else if (matches(*argv, "nopromisc") == 0) {
	flags \|= MACVLAN_FLAG_NOPROMISC;
	has_flags = 1;
	} else if (matches(*argv, "nodst") == 0) {
	flags \|= MACVLAN_FLAG_NODST;
	has_flags = 1;
	} else if (matches(*argv, "bcqueuelen") == 0) {
	__u32 bc_queue_len;
	NEXT_ARG();

	if (get_u32(&bc_queue_len, *argv, 0)) {
	return bc_queue_len_arg(*argv);
	}
	addattr32(n, 1024, IFLA_MACVLAN_BC_QUEUE_LEN, bc_queue_len);
	} else if (!strcmp(*argv, "bclim")) {
	__s32 bclim;
	NEXT_ARG();

	if (get_s32(&bclim, *argv, 0)) {
	return bclim_arg(*argv);
	}
	addattr_l(n, 1024, IFLA_MACVLAN_BC_CUTOFF,
	&bclim, sizeof(bclim));
	} else if (matches(*argv, "help") == 0) {
	explain(lu);
	return -1;
	} else {
	pfx_err(lu, "unknown option \"%s\"?", *argv);
	explain(lu);
	return -1;
	}
	argc--, argv++;
	}

	if (mode)
	addattr32(n, 1024, IFLA_MACVLAN_MODE, mode);

	if (has_flags) {
	if (flags & MACVLAN_FLAG_NOPROMISC &&
	mode != MACVLAN_MODE_PASSTHRU) {
	pfx_err(lu, "nopromisc flag only valid in passthru mode");
	explain(lu);
	return -1;
	}
	addattr16(n, 1024, IFLA_MACVLAN_FLAGS, flags);
	}
	return 0;
	}

	static void macvlan_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	{
	__u32 mode;
	__u16 flags;
	__u32 count;
	unsigned char *addr;
	int len;
	struct rtattr *rta;

	if (!tb)
	return;

	if (!tb[IFLA_MACVLAN_MODE] \|\|
	RTA_PAYLOAD(tb[IFLA_MACVLAN_MODE]) < sizeof(__u32))
	return;

	mode = rta_getattr_u32(tb[IFLA_MACVLAN_MODE]);
	print_string(PRINT_ANY,
	"mode",
	"mode %s ",
	mode == MACVLAN_MODE_PRIVATE ? "private"
	: mode == MACVLAN_MODE_VEPA ? "vepa"
	: mode == MACVLAN_MODE_BRIDGE ? "bridge"
	: mode == MACVLAN_MODE_PASSTHRU ? "passthru"
	: mode == MACVLAN_MODE_SOURCE ? "source"
	: "unknown");

	if (!tb[IFLA_MACVLAN_FLAGS] \|\|
	RTA_PAYLOAD(tb[IFLA_MACVLAN_FLAGS]) < sizeof(__u16))
	flags = 0;
	else
	flags = rta_getattr_u16(tb[IFLA_MACVLAN_FLAGS]);

	if (flags & MACVLAN_FLAG_NOPROMISC)
	print_bool(PRINT_ANY, "nopromisc", "nopromisc ", true);

	if (flags & MACVLAN_FLAG_NODST)
	print_bool(PRINT_ANY, "nodst", "nodst ", true);

	if (tb[IFLA_MACVLAN_BC_QUEUE_LEN] &&
	RTA_PAYLOAD(tb[IFLA_MACVLAN_BC_QUEUE_LEN]) >= sizeof(__u32)) {
	__u32 bc_queue_len = rta_getattr_u32(tb[IFLA_MACVLAN_BC_QUEUE_LEN]);
	print_luint(PRINT_ANY, "bcqueuelen", "bcqueuelen %lu ", bc_queue_len);
	}

	if (tb[IFLA_MACVLAN_BC_QUEUE_LEN_USED] &&
	RTA_PAYLOAD(tb[IFLA_MACVLAN_BC_QUEUE_LEN_USED]) >= sizeof(__u32)) {
	__u32 bc_queue_len = rta_getattr_u32(tb[IFLA_MACVLAN_BC_QUEUE_LEN_USED]);
	print_luint(PRINT_ANY, "usedbcqueuelen", "usedbcqueuelen %lu ", bc_queue_len);
	}

	if (tb[IFLA_MACVLAN_BC_CUTOFF] &&
	RTA_PAYLOAD(tb[IFLA_MACVLAN_BC_CUTOFF]) >= sizeof(__s32)) {
	__s32 bclim = rta_getattr_s32(tb[IFLA_MACVLAN_BC_CUTOFF]);
	print_int(PRINT_ANY, "bclim", "bclim %d ", bclim);
	}

	/* in source mode, there are more options to print */

	if (mode != MACVLAN_MODE_SOURCE)
	return;

	if (!tb[IFLA_MACVLAN_MACADDR_COUNT] \|\|
	RTA_PAYLOAD(tb[IFLA_MACVLAN_MACADDR_COUNT]) < sizeof(__u32))
	return;

	count = rta_getattr_u32(tb[IFLA_MACVLAN_MACADDR_COUNT]);
	print_int(PRINT_ANY, "macaddr_count", "remotes (%d) ", count);

	if (!tb[IFLA_MACVLAN_MACADDR_DATA])
	return;

	rta = RTA_DATA(tb[IFLA_MACVLAN_MACADDR_DATA]);
	len = RTA_PAYLOAD(tb[IFLA_MACVLAN_MACADDR_DATA]);

	open_json_array(PRINT_JSON, "macaddr_data");
	for (; RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
	if (rta->rta_type != IFLA_MACVLAN_MACADDR \|\|
	RTA_PAYLOAD(rta) < 6)
	continue;
	addr = RTA_DATA(rta);
	if (is_json_context()) {
	SPRINT_BUF(b1);

	snprintf(b1, sizeof(b1),
	"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", addr[0],
	addr[1], addr[2], addr[3], addr[4], addr[5]);
	print_string(PRINT_JSON, NULL, NULL, b1);
	} else {
	fprintf(f, "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x ", addr[0],
	addr[1], addr[2], addr[3], addr[4], addr[5]);
	}
	}
	close_json_array(PRINT_JSON, NULL);
	}

	static void macvlan_print_help(struct link_util lu, int argc, char *argv,
	FILE *f)
	{
	print_explain(lu, f);
	}

	struct link_util macvlan_link_util = {
	.id = "macvlan",
	.maxattr = IFLA_MACVLAN_MAX,
	.parse_opt = macvlan_parse_opt,
	.print_opt = macvlan_print_opt,
	.print_help = macvlan_print_help,
	};

	struct link_util macvtap_link_util = {
	.id = "macvtap",
	.maxattr = IFLA_MACVLAN_MAX,
	.parse_opt = macvlan_parse_opt,
	.print_opt = macvlan_print_opt,
	.print_help = macvlan_print_help,
	};