ip/iplink_vxlan.c - maze/iproute2 - Git at Google

 /*
  * iplink_vxlan.c	VXLAN device support
  *
  *              This program is free software; you can redistribute it and/or
  *              modify it under the terms of the GNU General Public License
  *              as published by the Free Software Foundation; either version
  *              2 of the License, or (at your option) any later version.
  *
  * Authors:     Stephen Hemminger <shemminger@vyatta.com
  */

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <net/if.h>
 #include <linux/ip.h>
 #include <linux/if_link.h>
 #include <arpa/inet.h>

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

 static void explain(void)
 {
 	fprintf(stderr, "Usage: ... vxlan id VNI [ { group | remote } ADDR ] [ local ADDR ]\n");
 	fprintf(stderr, "                 [ ttl TTL ] [ tos TOS ] [ dev PHYS_DEV ]\n");
 	fprintf(stderr, "                 [ port MIN MAX ] [ [no]learning ]\n");
 	fprintf(stderr, "                 [ [no]proxy ] [ [no]rsc ]\n");
 	fprintf(stderr, "                 [ [no]l2miss ] [ [no]l3miss ]\n");
 	fprintf(stderr, "\n");
 	fprintf(stderr, "Where: VNI := 0-16777215\n");
 	fprintf(stderr, "       ADDR := { IP_ADDRESS | any }\n");
 	fprintf(stderr, "       TOS  := { NUMBER | inherit }\n");
 	fprintf(stderr, "       TTL  := { 1..255 | inherit }\n");
 }

 static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
 			  struct nlmsghdr *n)
 {
 	__u32 vni = 0;
 	int vni_set = 0;
 	__u32 saddr = 0;
 	__u32 gaddr = 0;
 	__u32 daddr = 0;
 	struct in6_addr saddr6 = IN6ADDR_ANY_INIT;
 	struct in6_addr gaddr6 = IN6ADDR_ANY_INIT;
 	struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
 	unsigned link = 0;
 	__u8 tos = 0;
 	__u8 ttl = 0;
 	__u8 learning = 1;
 	__u8 proxy = 0;
 	__u8 rsc = 0;
 	__u8 l2miss = 0;
 	__u8 l3miss = 0;
 	__u8 noage = 0;
 	__u32 age = 0;
 	__u32 maxaddr = 0;
 	struct ifla_vxlan_port_range range = { 0, 0 };

 	while (argc > 0) {
 		if (!matches(*argv, "id") ||
 		    !matches(*argv, "vni")) {
 			NEXT_ARG();
 			if (get_u32(&vni, *argv, 0) ||
 			    vni >= 1u << 24)
 				invarg("invalid id", *argv);
 			vni_set = 1;
 		} else if (!matches(*argv, "group")) {
 			NEXT_ARG();
 			if (!inet_get_addr(*argv, &gaddr, &gaddr6)) {
 				fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 				return -1;
 			}
 			if (!IN6_IS_ADDR_MULTICAST(&gaddr6) && !IN_MULTICAST(ntohl(gaddr)))
 				invarg("invalid group address", *argv);
 		} else if (!matches(*argv, "remote")) {
 			NEXT_ARG();
 			if (!inet_get_addr(*argv, &daddr, &daddr6)) {
 				fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 				return -1;
 			}
 			if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
 				invarg("invalid remote address", *argv);
 		} else if (!matches(*argv, "local")) {
 			NEXT_ARG();
 			if (strcmp(*argv, "any")) {
 				if (!inet_get_addr(*argv, &saddr, &saddr6)) {
 					fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 					return -1;
 				}
 			}

 			if (IN_MULTICAST(ntohl(saddr)) || IN6_IS_ADDR_MULTICAST(&saddr6))
 				invarg("invalid local address", *argv);
 		} else if (!matches(*argv, "dev")) {
 			NEXT_ARG();
 			link = if_nametoindex(*argv);
 			if (link == 0)
 				exit(-1);
 		} else if (!matches(*argv, "ttl") ||
 			   !matches(*argv, "hoplimit")) {
 			unsigned uval;

 			NEXT_ARG();
 			if (strcmp(*argv, "inherit") != 0) {
 				if (get_unsigned(&uval, *argv, 0))
 					invarg("invalid TTL", *argv);
 				if (uval > 255)
 					invarg("TTL must be <= 255", *argv);
 				ttl = uval;
 			}
 		} else if (!matches(*argv, "tos") ||
 			   !matches(*argv, "dsfield")) {
 			__u32 uval;

 			NEXT_ARG();
 			if (strcmp(*argv, "inherit") != 0) {
 				if (rtnl_dsfield_a2n(&uval, *argv))
 					invarg("bad TOS value", *argv);
 				tos = uval;
 			} else
 				tos = 1;
 		} else if (!matches(*argv, "ageing")) {
 			NEXT_ARG();
 			if (strcmp(*argv, "none") == 0)
 				noage = 1;
 			else if (get_u32(&age, *argv, 0))
 				invarg("ageing timer", *argv);
 		} else if (!matches(*argv, "maxaddress")) {
 			NEXT_ARG();
 			if (strcmp(*argv, "unlimited") == 0)
 				maxaddr = 0;
 			else if (get_u32(&maxaddr, *argv, 0))
 				invarg("max addresses", *argv);
 		} else if (!matches(*argv, "port")) {
 			__u16 minport, maxport;
 			NEXT_ARG();
 			if (get_u16(&minport, *argv, 0))
 				invarg("min port", *argv);
 			NEXT_ARG();
 			if (get_u16(&maxport, *argv, 0))
 				invarg("max port", *argv);
 			range.low = htons(minport);
 			range.high = htons(maxport);
 		} else if (!matches(*argv, "nolearning")) {
 			learning = 0;
 		} else if (!matches(*argv, "learning")) {
 			learning = 1;
 		} else if (!matches(*argv, "noproxy")) {
 			proxy = 0;
 		} else if (!matches(*argv, "proxy")) {
 			proxy = 1;
 		} else if (!matches(*argv, "norsc")) {
 			rsc = 0;
 		} else if (!matches(*argv, "rsc")) {
 			rsc = 1;
 		} else if (!matches(*argv, "nol2miss")) {
 			l2miss = 0;
 		} else if (!matches(*argv, "l2miss")) {
 			l2miss = 1;
 		} else if (!matches(*argv, "nol3miss")) {
 			l3miss = 0;
 		} else if (!matches(*argv, "l3miss")) {
 			l3miss = 1;
 		} else if (matches(*argv, "help") == 0) {
 			explain();
 			return -1;
 		} else {
 			fprintf(stderr, "vxlan: unknown command \"%s\"?\n", *argv);
 			explain();
 			return -1;
 		}
 		argc--, argv++;
 	}

 	if (!vni_set) {
 		fprintf(stderr, "vxlan: missing virtual network identifier\n");
 		return -1;
 	}
 	if ((gaddr && daddr) ||
 		(memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) &&
 		 memcmp(&daddr6, &in6addr_any, sizeof(daddr6)))) {
 		fprintf(stderr, "vxlan: both group and remote cannot be specified\n");
 		return -1;
 	}
 	addattr32(n, 1024, IFLA_VXLAN_ID, vni);
 	if (gaddr)
 		addattr_l(n, 1024, IFLA_VXLAN_GROUP, &gaddr, 4);
 	else if (daddr)
 		addattr_l(n, 1024, IFLA_VXLAN_GROUP, &daddr, 4);
 	if (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) != 0)
 		addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &gaddr6, sizeof(struct in6_addr));
 	else if (memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) != 0)
 		addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &daddr6, sizeof(struct in6_addr));

 	if (saddr)
 		addattr_l(n, 1024, IFLA_VXLAN_LOCAL, &saddr, 4);
 	else if (memcmp(&saddr6, &in6addr_any, sizeof(saddr6)) != 0)
 		addattr_l(n, 1024, IFLA_VXLAN_LOCAL6, &saddr6, sizeof(struct in6_addr));

 	if (link)
 		addattr32(n, 1024, IFLA_VXLAN_LINK, link);
 	addattr8(n, 1024, IFLA_VXLAN_TTL, ttl);
 	addattr8(n, 1024, IFLA_VXLAN_TOS, tos);
 	addattr8(n, 1024, IFLA_VXLAN_LEARNING, learning);
 	addattr8(n, 1024, IFLA_VXLAN_PROXY, proxy);
 	addattr8(n, 1024, IFLA_VXLAN_RSC, rsc);
 	addattr8(n, 1024, IFLA_VXLAN_L2MISS, l2miss);
 	addattr8(n, 1024, IFLA_VXLAN_L3MISS, l3miss);
 	if (noage)
 		addattr32(n, 1024, IFLA_VXLAN_AGEING, 0);
 	else if (age)
 		addattr32(n, 1024, IFLA_VXLAN_AGEING, age);
 	if (maxaddr)
 		addattr32(n, 1024, IFLA_VXLAN_LIMIT, maxaddr);
 	if (range.low || range.high)
 		addattr_l(n, 1024, IFLA_VXLAN_PORT_RANGE,
 			  &range, sizeof(range));

 	return 0;
 }

 static void vxlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 {
 	__u32 vni;
 	unsigned link;
 	__u8 tos;
 	__u32 maxaddr;
 	char s1[1024];
 	char s2[64];

 	if (!tb)
 		return;

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

 	vni = rta_getattr_u32(tb[IFLA_VXLAN_ID]);
 	fprintf(f, "id %u ", vni);

 	if (tb[IFLA_VXLAN_GROUP]) {
 		__be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_GROUP]);
 		if (addr) {
 			if (IN_MULTICAST(ntohl(addr)))
 				fprintf(f, "group %s ",
 					format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 			else
 				fprintf(f, "remote %s ",
 					format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 		}
 	} else if (tb[IFLA_VXLAN_GROUP6]) {
 		struct in6_addr addr;
 		memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_GROUP6]), sizeof(struct in6_addr));
 		if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0) {
 			if (IN6_IS_ADDR_MULTICAST(&addr))
 				fprintf(f, "group %s ",
 					format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 			else
 				fprintf(f, "remote %s ",
 					format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 		}
 	}

 	if (tb[IFLA_VXLAN_LOCAL]) {
 		__be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_LOCAL]);
 		if (addr)
 			fprintf(f, "local %s ",
 				format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 	} else if (tb[IFLA_VXLAN_LOCAL6]) {
 		struct in6_addr addr;
 		memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_LOCAL6]), sizeof(struct in6_addr));
 		if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0)
 			fprintf(f, "local %s ",
 				format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
 	}

 	if (tb[IFLA_VXLAN_LINK] &&
 	    (link = rta_getattr_u32(tb[IFLA_VXLAN_LINK]))) {
 		const char *n = if_indextoname(link, s2);

 		if (n)
 			fprintf(f, "dev %s ", n);
 		else
 			fprintf(f, "dev %u ", link);
 	}

 	if (tb[IFLA_VXLAN_PORT_RANGE]) {
 		const struct ifla_vxlan_port_range *r
 			= RTA_DATA(tb[IFLA_VXLAN_PORT_RANGE]);
 		fprintf(f, "port %u %u ", ntohs(r->low), ntohs(r->high));
 	}

 	if (tb[IFLA_VXLAN_LEARNING] &&
 	    !rta_getattr_u8(tb[IFLA_VXLAN_LEARNING]))
 		fputs("nolearning ", f);

 	if (tb[IFLA_VXLAN_PROXY] && rta_getattr_u8(tb[IFLA_VXLAN_PROXY]))
 		fputs("proxy ", f);

 	if (tb[IFLA_VXLAN_RSC] && rta_getattr_u8(tb[IFLA_VXLAN_RSC]))
 		fputs("rsc ", f);

 	if (tb[IFLA_VXLAN_L2MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L2MISS]))
 		fputs("l2miss ", f);

 	if (tb[IFLA_VXLAN_L3MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L3MISS]))
 		fputs("l3miss ", f);

 	if (tb[IFLA_VXLAN_TOS] &&
 	    (tos = rta_getattr_u8(tb[IFLA_VXLAN_TOS]))) {
 		if (tos == 1)
 			fprintf(f, "tos inherit ");
 		else
 			fprintf(f, "tos %#x ", tos);
 	}

 	if (tb[IFLA_VXLAN_TTL]) {
 		__u8 ttl = rta_getattr_u8(tb[IFLA_VXLAN_TTL]);
 		if (ttl)
 			fprintf(f, "ttl %d ", ttl);
 	}

 	if (tb[IFLA_VXLAN_AGEING]) {
 		__u32 age = rta_getattr_u32(tb[IFLA_VXLAN_AGEING]);
 		if (age == 0)
 			fprintf(f, "ageing none ");
 		else
 			fprintf(f, "ageing %u ", age);
 	}

 	if (tb[IFLA_VXLAN_LIMIT] &&
 	    (maxaddr = rta_getattr_u32(tb[IFLA_VXLAN_LIMIT]) != 0))
 		    fprintf(f, "maxaddr %u ", maxaddr);
 }

 struct link_util vxlan_link_util = {
 	.id		= "vxlan",
 	.maxattr	= IFLA_VXLAN_MAX,
 	.parse_opt	= vxlan_parse_opt,
 	.print_opt	= vxlan_print_opt,
 };
	/*
	* iplink_vxlan.c VXLAN device support
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*
	* Authors: Stephen Hemminger <shemminger@vyatta.com
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <net/if.h>
	#include <linux/ip.h>
	#include <linux/if_link.h>
	#include <arpa/inet.h>

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

	static void explain(void)
	{
	fprintf(stderr, "Usage: ... vxlan id VNI [ { group \| remote } ADDR ] [ local ADDR ]\n");
	fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ dev PHYS_DEV ]\n");
	fprintf(stderr, " [ port MIN MAX ] [ [no]learning ]\n");
	fprintf(stderr, " [ [no]proxy ] [ [no]rsc ]\n");
	fprintf(stderr, " [ [no]l2miss ] [ [no]l3miss ]\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "Where: VNI := 0-16777215\n");
	fprintf(stderr, " ADDR := { IP_ADDRESS \| any }\n");
	fprintf(stderr, " TOS := { NUMBER \| inherit }\n");
	fprintf(stderr, " TTL := { 1..255 \| inherit }\n");
	}

	static int vxlan_parse_opt(struct link_util lu, int argc, char *argv,
	struct nlmsghdr *n)
	{
	__u32 vni = 0;
	int vni_set = 0;
	__u32 saddr = 0;
	__u32 gaddr = 0;
	__u32 daddr = 0;
	struct in6_addr saddr6 = IN6ADDR_ANY_INIT;
	struct in6_addr gaddr6 = IN6ADDR_ANY_INIT;
	struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
	unsigned link = 0;
	__u8 tos = 0;
	__u8 ttl = 0;
	__u8 learning = 1;
	__u8 proxy = 0;
	__u8 rsc = 0;
	__u8 l2miss = 0;
	__u8 l3miss = 0;
	__u8 noage = 0;
	__u32 age = 0;
	__u32 maxaddr = 0;
	struct ifla_vxlan_port_range range = { 0, 0 };

	while (argc > 0) {
	if (!matches(*argv, "id") \|\|
	!matches(*argv, "vni")) {
	NEXT_ARG();
	if (get_u32(&vni, *argv, 0) \|\|
	vni >= 1u << 24)
	invarg("invalid id", *argv);
	vni_set = 1;
	} else if (!matches(*argv, "group")) {
	NEXT_ARG();
	if (!inet_get_addr(*argv, &gaddr, &gaddr6)) {
	fprintf(stderr, "Invalid address \"%s\"\n", *argv);
	return -1;
	}
	if (!IN6_IS_ADDR_MULTICAST(&gaddr6) && !IN_MULTICAST(ntohl(gaddr)))
	invarg("invalid group address", *argv);
	} else if (!matches(*argv, "remote")) {
	NEXT_ARG();
	if (!inet_get_addr(*argv, &daddr, &daddr6)) {
	fprintf(stderr, "Invalid address \"%s\"\n", *argv);
	return -1;
	}
	if (IN6_IS_ADDR_MULTICAST(&daddr6) \|\| IN_MULTICAST(ntohl(daddr)))
	invarg("invalid remote address", *argv);
	} else if (!matches(*argv, "local")) {
	NEXT_ARG();
	if (strcmp(*argv, "any")) {
	if (!inet_get_addr(*argv, &saddr, &saddr6)) {
	fprintf(stderr, "Invalid address \"%s\"\n", *argv);
	return -1;
	}
	}

	if (IN_MULTICAST(ntohl(saddr)) \|\| IN6_IS_ADDR_MULTICAST(&saddr6))
	invarg("invalid local address", *argv);
	} else if (!matches(*argv, "dev")) {
	NEXT_ARG();
	link = if_nametoindex(*argv);
	if (link == 0)
	exit(-1);
	} else if (!matches(*argv, "ttl") \|\|
	!matches(*argv, "hoplimit")) {
	unsigned uval;

	NEXT_ARG();
	if (strcmp(*argv, "inherit") != 0) {
	if (get_unsigned(&uval, *argv, 0))
	invarg("invalid TTL", *argv);
	if (uval > 255)
	invarg("TTL must be <= 255", *argv);
	ttl = uval;
	}
	} else if (!matches(*argv, "tos") \|\|
	!matches(*argv, "dsfield")) {
	__u32 uval;

	NEXT_ARG();
	if (strcmp(*argv, "inherit") != 0) {
	if (rtnl_dsfield_a2n(&uval, *argv))
	invarg("bad TOS value", *argv);
	tos = uval;
	} else
	tos = 1;
	} else if (!matches(*argv, "ageing")) {
	NEXT_ARG();
	if (strcmp(*argv, "none") == 0)
	noage = 1;
	else if (get_u32(&age, *argv, 0))
	invarg("ageing timer", *argv);
	} else if (!matches(*argv, "maxaddress")) {
	NEXT_ARG();
	if (strcmp(*argv, "unlimited") == 0)
	maxaddr = 0;
	else if (get_u32(&maxaddr, *argv, 0))
	invarg("max addresses", *argv);
	} else if (!matches(*argv, "port")) {
	__u16 minport, maxport;
	NEXT_ARG();
	if (get_u16(&minport, *argv, 0))
	invarg("min port", *argv);
	NEXT_ARG();
	if (get_u16(&maxport, *argv, 0))
	invarg("max port", *argv);
	range.low = htons(minport);
	range.high = htons(maxport);
	} else if (!matches(*argv, "nolearning")) {
	learning = 0;
	} else if (!matches(*argv, "learning")) {
	learning = 1;
	} else if (!matches(*argv, "noproxy")) {
	proxy = 0;
	} else if (!matches(*argv, "proxy")) {
	proxy = 1;
	} else if (!matches(*argv, "norsc")) {
	rsc = 0;
	} else if (!matches(*argv, "rsc")) {
	rsc = 1;
	} else if (!matches(*argv, "nol2miss")) {
	l2miss = 0;
	} else if (!matches(*argv, "l2miss")) {
	l2miss = 1;
	} else if (!matches(*argv, "nol3miss")) {
	l3miss = 0;
	} else if (!matches(*argv, "l3miss")) {
	l3miss = 1;
	} else if (matches(*argv, "help") == 0) {
	explain();
	return -1;
	} else {
	fprintf(stderr, "vxlan: unknown command \"%s\"?\n", *argv);
	explain();
	return -1;
	}
	argc--, argv++;
	}

	if (!vni_set) {
	fprintf(stderr, "vxlan: missing virtual network identifier\n");
	return -1;
	}
	if ((gaddr && daddr) \|\|
	(memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) &&
	memcmp(&daddr6, &in6addr_any, sizeof(daddr6)))) {
	fprintf(stderr, "vxlan: both group and remote cannot be specified\n");
	return -1;
	}
	addattr32(n, 1024, IFLA_VXLAN_ID, vni);
	if (gaddr)
	addattr_l(n, 1024, IFLA_VXLAN_GROUP, &gaddr, 4);
	else if (daddr)
	addattr_l(n, 1024, IFLA_VXLAN_GROUP, &daddr, 4);
	if (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) != 0)
	addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &gaddr6, sizeof(struct in6_addr));
	else if (memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) != 0)
	addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &daddr6, sizeof(struct in6_addr));

	if (saddr)
	addattr_l(n, 1024, IFLA_VXLAN_LOCAL, &saddr, 4);
	else if (memcmp(&saddr6, &in6addr_any, sizeof(saddr6)) != 0)
	addattr_l(n, 1024, IFLA_VXLAN_LOCAL6, &saddr6, sizeof(struct in6_addr));

	if (link)
	addattr32(n, 1024, IFLA_VXLAN_LINK, link);
	addattr8(n, 1024, IFLA_VXLAN_TTL, ttl);
	addattr8(n, 1024, IFLA_VXLAN_TOS, tos);
	addattr8(n, 1024, IFLA_VXLAN_LEARNING, learning);
	addattr8(n, 1024, IFLA_VXLAN_PROXY, proxy);
	addattr8(n, 1024, IFLA_VXLAN_RSC, rsc);
	addattr8(n, 1024, IFLA_VXLAN_L2MISS, l2miss);
	addattr8(n, 1024, IFLA_VXLAN_L3MISS, l3miss);
	if (noage)
	addattr32(n, 1024, IFLA_VXLAN_AGEING, 0);
	else if (age)
	addattr32(n, 1024, IFLA_VXLAN_AGEING, age);
	if (maxaddr)
	addattr32(n, 1024, IFLA_VXLAN_LIMIT, maxaddr);
	if (range.low \|\| range.high)
	addattr_l(n, 1024, IFLA_VXLAN_PORT_RANGE,
	&range, sizeof(range));

	return 0;
	}

	static void vxlan_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	{
	__u32 vni;
	unsigned link;
	__u8 tos;
	__u32 maxaddr;
	char s1[1024];
	char s2[64];

	if (!tb)
	return;

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

	vni = rta_getattr_u32(tb[IFLA_VXLAN_ID]);
	fprintf(f, "id %u ", vni);

	if (tb[IFLA_VXLAN_GROUP]) {
	__be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_GROUP]);
	if (addr) {
	if (IN_MULTICAST(ntohl(addr)))
	fprintf(f, "group %s ",
	format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
	else
	fprintf(f, "remote %s ",
	format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
	}
	} else if (tb[IFLA_VXLAN_GROUP6]) {
	struct in6_addr addr;
	memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_GROUP6]), sizeof(struct in6_addr));
	if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0) {
	if (IN6_IS_ADDR_MULTICAST(&addr))
	fprintf(f, "group %s ",
	format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
	else
	fprintf(f, "remote %s ",
	format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
	}
	}

	if (tb[IFLA_VXLAN_LOCAL]) {
	__be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_LOCAL]);
	if (addr)
	fprintf(f, "local %s ",
	format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
	} else if (tb[IFLA_VXLAN_LOCAL6]) {
	struct in6_addr addr;
	memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_LOCAL6]), sizeof(struct in6_addr));
	if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0)
	fprintf(f, "local %s ",
	format_host(AF_INET6, sizeof(struct in6_addr), &addr, s1, sizeof(s1)));
	}

	if (tb[IFLA_VXLAN_LINK] &&
	(link = rta_getattr_u32(tb[IFLA_VXLAN_LINK]))) {
	const char *n = if_indextoname(link, s2);

	if (n)
	fprintf(f, "dev %s ", n);
	else
	fprintf(f, "dev %u ", link);
	}

	if (tb[IFLA_VXLAN_PORT_RANGE]) {
	const struct ifla_vxlan_port_range *r
	= RTA_DATA(tb[IFLA_VXLAN_PORT_RANGE]);
	fprintf(f, "port %u %u ", ntohs(r->low), ntohs(r->high));
	}

	if (tb[IFLA_VXLAN_LEARNING] &&
	!rta_getattr_u8(tb[IFLA_VXLAN_LEARNING]))
	fputs("nolearning ", f);

	if (tb[IFLA_VXLAN_PROXY] && rta_getattr_u8(tb[IFLA_VXLAN_PROXY]))
	fputs("proxy ", f);

	if (tb[IFLA_VXLAN_RSC] && rta_getattr_u8(tb[IFLA_VXLAN_RSC]))
	fputs("rsc ", f);

	if (tb[IFLA_VXLAN_L2MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L2MISS]))
	fputs("l2miss ", f);

	if (tb[IFLA_VXLAN_L3MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L3MISS]))
	fputs("l3miss ", f);

	if (tb[IFLA_VXLAN_TOS] &&
	(tos = rta_getattr_u8(tb[IFLA_VXLAN_TOS]))) {
	if (tos == 1)
	fprintf(f, "tos inherit ");
	else
	fprintf(f, "tos %#x ", tos);
	}

	if (tb[IFLA_VXLAN_TTL]) {
	__u8 ttl = rta_getattr_u8(tb[IFLA_VXLAN_TTL]);
	if (ttl)
	fprintf(f, "ttl %d ", ttl);
	}

	if (tb[IFLA_VXLAN_AGEING]) {
	__u32 age = rta_getattr_u32(tb[IFLA_VXLAN_AGEING]);
	if (age == 0)
	fprintf(f, "ageing none ");
	else
	fprintf(f, "ageing %u ", age);
	}

	if (tb[IFLA_VXLAN_LIMIT] &&
	(maxaddr = rta_getattr_u32(tb[IFLA_VXLAN_LIMIT]) != 0))
	fprintf(f, "maxaddr %u ", maxaddr);
	}

	struct link_util vxlan_link_util = {
	.id = "vxlan",
	.maxattr = IFLA_VXLAN_MAX,
	.parse_opt = vxlan_parse_opt,
	.print_opt = vxlan_print_opt,
	};