ip/iplink_geneve.c - pub/scm/linux/kernel/git/toke/iproute2 - Git at Google

 /*
  * iplink_geneve.c	GENEVE 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:     John W. Linville <linville@tuxdriver.com>
  */

 #include <stdio.h>

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

 #define GENEVE_ATTRSET(attrs, type) (((attrs) & (1L << (type))) != 0)

 static void print_explain(FILE *f)
 {
 	fprintf(f,
 		"Usage: ... geneve id VNI\n"
 		"		remote ADDR\n"
 		"		[ ttl TTL ]\n"
 		"		[ tos TOS ]\n"
 		"		[ df DF ]\n"
 		"		[ flowlabel LABEL ]\n"
 		"		[ dstport PORT ]\n"
 		"		[ [no]external ]\n"
 		"		[ [no]udpcsum ]\n"
 		"		[ [no]udp6zerocsumtx ]\n"
 		"		[ [no]udp6zerocsumrx ]\n"
 		"\n"
 		"Where:	VNI   := 0-16777215\n"
 		"	ADDR  := IP_ADDRESS\n"
 		"	TOS   := { NUMBER | inherit }\n"
 		"	TTL   := { 1..255 | auto | inherit }\n"
 		"	DF    := { unset | set | inherit }\n"
 		"	LABEL := 0-1048575\n"
 	);
 }

 static void explain(void)
 {
 	print_explain(stderr);
 }

 static void check_duparg(__u64 *attrs, int type, const char *key,
 			 const char *argv)
 {
 	if (!GENEVE_ATTRSET(*attrs, type)) {
 		*attrs |= (1L << type);
 		return;
 	}
 	duparg2(key, argv);
 }

 static int geneve_parse_opt(struct link_util *lu, int argc, char **argv,
 			  struct nlmsghdr *n)
 {
 	inet_prefix daddr;
 	__u32 vni = 0;
 	__u32 label = 0;
 	__u8 ttl = 0;
 	__u8 tos = 0;
 	__u16 dstport = 0;
 	bool metadata = 0;
 	__u8 udpcsum = 0;
 	__u8 udp6zerocsumtx = 0;
 	__u8 udp6zerocsumrx = 0;
 	__u64 attrs = 0;
 	bool set_op = (n->nlmsg_type == RTM_NEWLINK &&
 		       !(n->nlmsg_flags & NLM_F_CREATE));

 	inet_prefix_reset(&daddr);

 	while (argc > 0) {
 		if (!matches(*argv, "id") ||
 		    !matches(*argv, "vni")) {
 			NEXT_ARG();
 			check_duparg(&attrs, IFLA_GENEVE_ID, "id", *argv);
 			if (get_u32(&vni, *argv, 0) ||
 			    vni >= 1u << 24)
 				invarg("invalid id", *argv);
 		} else if (!matches(*argv, "remote")) {
 			NEXT_ARG();
 			check_duparg(&attrs, IFLA_GENEVE_REMOTE, "remote",
 				     *argv);
 			get_addr(&daddr, *argv, AF_UNSPEC);
 			if (!is_addrtype_inet_not_multi(&daddr))
 				invarg("invalid remote address", *argv);
 		} else if (!matches(*argv, "ttl") ||
 			   !matches(*argv, "hoplimit")) {
 			unsigned int uval;

 			NEXT_ARG();
 			check_duparg(&attrs, IFLA_GENEVE_TTL, "ttl", *argv);
 			if (strcmp(*argv, "inherit") == 0) {
 				addattr8(n, 1024, IFLA_GENEVE_TTL_INHERIT, 1);
 			} else if (strcmp(*argv, "auto") != 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();
 			check_duparg(&attrs, IFLA_GENEVE_TOS, "tos", *argv);
 			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, "df")) {
 			enum ifla_geneve_df df;

 			NEXT_ARG();
 			check_duparg(&attrs, IFLA_GENEVE_DF, "df", *argv);
 			if (strcmp(*argv, "unset") == 0)
 				df = GENEVE_DF_UNSET;
 			else if (strcmp(*argv, "set") == 0)
 				df = GENEVE_DF_SET;
 			else if (strcmp(*argv, "inherit") == 0)
 				df = GENEVE_DF_INHERIT;
 			else
 				invarg("DF must be 'unset', 'set' or 'inherit'",
 				       *argv);

 			addattr8(n, 1024, IFLA_GENEVE_DF, df);
 		} else if (!matches(*argv, "label") ||
 			   !matches(*argv, "flowlabel")) {
 			__u32 uval;

 			NEXT_ARG();
 			check_duparg(&attrs, IFLA_GENEVE_LABEL, "flowlabel",
 				     *argv);
 			if (get_u32(&uval, *argv, 0) ||
 			    (uval & ~LABEL_MAX_MASK))
 				invarg("invalid flowlabel", *argv);
 			label = htonl(uval);
 		} else if (!matches(*argv, "dstport")) {
 			NEXT_ARG();
 			check_duparg(&attrs, IFLA_GENEVE_PORT, "dstport",
 				     *argv);
 			if (get_u16(&dstport, *argv, 0))
 				invarg("dstport", *argv);
 		} else if (!matches(*argv, "external")) {
 			check_duparg(&attrs, IFLA_GENEVE_COLLECT_METADATA,
 				     *argv, *argv);
 			metadata = true;
 		} else if (!matches(*argv, "noexternal")) {
 			check_duparg(&attrs, IFLA_GENEVE_COLLECT_METADATA,
 				     *argv, *argv);
 			metadata = false;
 		} else if (!matches(*argv, "udpcsum")) {
 			check_duparg(&attrs, IFLA_GENEVE_UDP_CSUM, *argv,
 				     *argv);
 			udpcsum = 1;
 		} else if (!matches(*argv, "noudpcsum")) {
 			check_duparg(&attrs, IFLA_GENEVE_UDP_CSUM, *argv,
 				     *argv);
 			udpcsum = 0;
 		} else if (!matches(*argv, "udp6zerocsumtx")) {
 			check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
 				     *argv, *argv);
 			udp6zerocsumtx = 1;
 		} else if (!matches(*argv, "noudp6zerocsumtx")) {
 			check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
 				     *argv, *argv);
 			udp6zerocsumtx = 0;
 		} else if (!matches(*argv, "udp6zerocsumrx")) {
 			check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
 				     *argv, *argv);
 			udp6zerocsumrx = 1;
 		} else if (!matches(*argv, "noudp6zerocsumrx")) {
 			check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
 				     *argv, *argv);
 			udp6zerocsumrx = 0;
 		} else if (matches(*argv, "help") == 0) {
 			explain();
 			return -1;
 		} else {
 			fprintf(stderr, "geneve: unknown command \"%s\"?\n", *argv);
 			explain();
 			return -1;
 		}
 		argc--, argv++;
 	}

 	if (metadata && GENEVE_ATTRSET(attrs, IFLA_GENEVE_ID)) {
 		fprintf(stderr, "geneve: both 'external' and vni cannot be specified\n");
 		return -1;
 	}

 	if (!metadata) {
 		/* parameter checking make sense only for full geneve tunnels */
 		if (!GENEVE_ATTRSET(attrs, IFLA_GENEVE_ID)) {
 			fprintf(stderr, "geneve: missing virtual network identifier\n");
 			return -1;
 		}

 		/* If we are modifying the geneve device, then we only need the
 		 * ID (VNI) to identify the geneve device, and we do not need
 		 * the remote IP.
 		 */
 		if (!set_op && !is_addrtype_inet(&daddr)) {
 			fprintf(stderr, "geneve: remote link partner not specified\n");
 			return -1;
 		}
 	}

 	addattr32(n, 1024, IFLA_GENEVE_ID, vni);
 	if (is_addrtype_inet(&daddr)) {
 		int type = (daddr.family == AF_INET) ? IFLA_GENEVE_REMOTE :
 						       IFLA_GENEVE_REMOTE6;
 		addattr_l(n, 1024, type, daddr.data, daddr.bytelen);
 	}
 	if (!set_op || GENEVE_ATTRSET(attrs, IFLA_GENEVE_LABEL))
 		addattr32(n, 1024, IFLA_GENEVE_LABEL, label);
 	if (!set_op || GENEVE_ATTRSET(attrs, IFLA_GENEVE_TTL))
 		addattr8(n, 1024, IFLA_GENEVE_TTL, ttl);
 	if (!set_op || GENEVE_ATTRSET(attrs, IFLA_GENEVE_TOS))
 		addattr8(n, 1024, IFLA_GENEVE_TOS, tos);
 	if (dstport)
 		addattr16(n, 1024, IFLA_GENEVE_PORT, htons(dstport));
 	if (metadata)
 		addattr(n, 1024, IFLA_GENEVE_COLLECT_METADATA);
 	if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_CSUM))
 		addattr8(n, 1024, IFLA_GENEVE_UDP_CSUM, udpcsum);
 	if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX))
 		addattr8(n, 1024, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, udp6zerocsumtx);
 	if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX))
 		addattr8(n, 1024, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);

 	return 0;
 }

 static void geneve_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 {
 	__u32 vni;
 	__u8 ttl = 0;
 	__u8 tos = 0;

 	if (!tb)
 		return;

 	if (tb[IFLA_GENEVE_COLLECT_METADATA]) {
 		print_bool(PRINT_ANY, "external", "external ", true);
 		return;
 	}

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

 	vni = rta_getattr_u32(tb[IFLA_GENEVE_ID]);
 	print_uint(PRINT_ANY, "id", "id %u ", vni);

 	if (tb[IFLA_GENEVE_REMOTE]) {
 		__be32 addr = rta_getattr_u32(tb[IFLA_GENEVE_REMOTE]);

 		if (addr)
 			print_string(PRINT_ANY,
 				     "remote",
 				     "remote %s ",
 				     format_host(AF_INET, 4, &addr));
 	} else if (tb[IFLA_GENEVE_REMOTE6]) {
 		struct in6_addr addr;

 		memcpy(&addr, RTA_DATA(tb[IFLA_GENEVE_REMOTE6]), sizeof(struct in6_addr));
 		if (!IN6_IS_ADDR_UNSPECIFIED(&addr)) {
 			if (!IN6_IS_ADDR_MULTICAST(&addr))
 				print_string(PRINT_ANY,
 					     "remote6",
 					     "remote %s ",
 					     format_host(AF_INET6,
 							 sizeof(struct in6_addr),
 							 &addr));
 		}
 	}

 	if (tb[IFLA_GENEVE_TTL_INHERIT] &&
 	    rta_getattr_u8(tb[IFLA_GENEVE_TTL_INHERIT])) {
 		print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
 	} else if (tb[IFLA_GENEVE_TTL]) {
 		ttl = rta_getattr_u8(tb[IFLA_GENEVE_TTL]);
 		if (is_json_context() || ttl)
 			print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
 		else
 			print_string(PRINT_FP, NULL, "ttl %s ", "auto");
 	}

 	if (tb[IFLA_GENEVE_TOS])
 		tos = rta_getattr_u8(tb[IFLA_GENEVE_TOS]);
 	if (tos) {
 		if (is_json_context() || tos != 1)
 			print_0xhex(PRINT_ANY, "tos", "tos %#llx ", tos);
 		else
 			print_string(PRINT_FP, NULL, "tos %s ", "inherit");
 	}

 	if (tb[IFLA_GENEVE_DF]) {
 		enum ifla_geneve_df df = rta_getattr_u8(tb[IFLA_GENEVE_DF]);

 		if (df == GENEVE_DF_UNSET)
 			print_string(PRINT_JSON, "df", "df %s ", "unset");
 		else if (df == GENEVE_DF_SET)
 			print_string(PRINT_ANY, "df", "df %s ", "set");
 		else if (df == GENEVE_DF_INHERIT)
 			print_string(PRINT_ANY, "df", "df %s ", "inherit");
 	}

 	if (tb[IFLA_GENEVE_LABEL]) {
 		__u32 label = rta_getattr_u32(tb[IFLA_GENEVE_LABEL]);

 		if (label)
 			print_0xhex(PRINT_ANY,
 				    "label", "flowlabel %#llx ",
 				    ntohl(label));
 	}

 	if (tb[IFLA_GENEVE_PORT])
 		print_uint(PRINT_ANY,
 			   "port",
 			   "dstport %u ",
 			   rta_getattr_be16(tb[IFLA_GENEVE_PORT]));

 	if (tb[IFLA_GENEVE_UDP_CSUM]) {
 		if (is_json_context()) {
 			print_bool(PRINT_JSON,
 				   "udp_csum",
 				   NULL,
 				   rta_getattr_u8(tb[IFLA_GENEVE_UDP_CSUM]));
 		} else {
 			if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_CSUM]))
 				fputs("no", f);
 			fputs("udpcsum ", f);
 		}
 	}

 	if (tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
 		if (is_json_context()) {
 			print_bool(PRINT_JSON,
 				   "udp_zero_csum6_tx",
 				   NULL,
 				   rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]));
 		} else {
 			if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
 				fputs("no", f);
 			fputs("udp6zerocsumtx ", f);
 		}
 	}

 	if (tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
 		if (is_json_context()) {
 			print_bool(PRINT_JSON,
 				   "udp_zero_csum6_rx",
 				   NULL,
 				   rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]));
 		} else {
 			if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
 				fputs("no", f);
 			fputs("udp6zerocsumrx ", f);
 		}
 	}
 }

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

 struct link_util geneve_link_util = {
 	.id		= "geneve",
 	.maxattr	= IFLA_GENEVE_MAX,
 	.parse_opt	= geneve_parse_opt,
 	.print_opt	= geneve_print_opt,
 	.print_help	= geneve_print_help,
 };
	/*
	* iplink_geneve.c GENEVE 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: John W. Linville <linville@tuxdriver.com>
	*/

	#include <stdio.h>

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

	#define GENEVE_ATTRSET(attrs, type) (((attrs) & (1L << (type))) != 0)

	static void print_explain(FILE *f)
	{
	fprintf(f,
	"Usage: ... geneve id VNI\n"
	" remote ADDR\n"
	" [ ttl TTL ]\n"
	" [ tos TOS ]\n"
	" [ df DF ]\n"
	" [ flowlabel LABEL ]\n"
	" [ dstport PORT ]\n"
	" [ [no]external ]\n"
	" [ [no]udpcsum ]\n"
	" [ [no]udp6zerocsumtx ]\n"
	" [ [no]udp6zerocsumrx ]\n"
	"\n"
	"Where: VNI := 0-16777215\n"
	" ADDR := IP_ADDRESS\n"
	" TOS := { NUMBER \| inherit }\n"
	" TTL := { 1..255 \| auto \| inherit }\n"
	" DF := { unset \| set \| inherit }\n"
	" LABEL := 0-1048575\n"
	);
	}

	static void explain(void)
	{
	print_explain(stderr);
	}

	static void check_duparg(__u64 attrs, int type, const char key,
	const char *argv)
	{
	if (!GENEVE_ATTRSET(*attrs, type)) {
	*attrs \|= (1L << type);
	return;
	}
	duparg2(key, argv);
	}

	static int geneve_parse_opt(struct link_util lu, int argc, char *argv,
	struct nlmsghdr *n)
	{
	inet_prefix daddr;
	__u32 vni = 0;
	__u32 label = 0;
	__u8 ttl = 0;
	__u8 tos = 0;
	__u16 dstport = 0;
	bool metadata = 0;
	__u8 udpcsum = 0;
	__u8 udp6zerocsumtx = 0;
	__u8 udp6zerocsumrx = 0;
	__u64 attrs = 0;
	bool set_op = (n->nlmsg_type == RTM_NEWLINK &&
	!(n->nlmsg_flags & NLM_F_CREATE));

	inet_prefix_reset(&daddr);

	while (argc > 0) {
	if (!matches(*argv, "id") \|\|
	!matches(*argv, "vni")) {
	NEXT_ARG();
	check_duparg(&attrs, IFLA_GENEVE_ID, "id", *argv);
	if (get_u32(&vni, *argv, 0) \|\|
	vni >= 1u << 24)
	invarg("invalid id", *argv);
	} else if (!matches(*argv, "remote")) {
	NEXT_ARG();
	check_duparg(&attrs, IFLA_GENEVE_REMOTE, "remote",
	*argv);
	get_addr(&daddr, *argv, AF_UNSPEC);
	if (!is_addrtype_inet_not_multi(&daddr))
	invarg("invalid remote address", *argv);
	} else if (!matches(*argv, "ttl") \|\|
	!matches(*argv, "hoplimit")) {
	unsigned int uval;

	NEXT_ARG();
	check_duparg(&attrs, IFLA_GENEVE_TTL, "ttl", *argv);
	if (strcmp(*argv, "inherit") == 0) {
	addattr8(n, 1024, IFLA_GENEVE_TTL_INHERIT, 1);
	} else if (strcmp(*argv, "auto") != 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();
	check_duparg(&attrs, IFLA_GENEVE_TOS, "tos", *argv);
	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, "df")) {
	enum ifla_geneve_df df;

	NEXT_ARG();
	check_duparg(&attrs, IFLA_GENEVE_DF, "df", *argv);
	if (strcmp(*argv, "unset") == 0)
	df = GENEVE_DF_UNSET;
	else if (strcmp(*argv, "set") == 0)
	df = GENEVE_DF_SET;
	else if (strcmp(*argv, "inherit") == 0)
	df = GENEVE_DF_INHERIT;
	else
	invarg("DF must be 'unset', 'set' or 'inherit'",
	*argv);

	addattr8(n, 1024, IFLA_GENEVE_DF, df);
	} else if (!matches(*argv, "label") \|\|
	!matches(*argv, "flowlabel")) {
	__u32 uval;

	NEXT_ARG();
	check_duparg(&attrs, IFLA_GENEVE_LABEL, "flowlabel",
	*argv);
	if (get_u32(&uval, *argv, 0) \|\|
	(uval & ~LABEL_MAX_MASK))
	invarg("invalid flowlabel", *argv);
	label = htonl(uval);
	} else if (!matches(*argv, "dstport")) {
	NEXT_ARG();
	check_duparg(&attrs, IFLA_GENEVE_PORT, "dstport",
	*argv);
	if (get_u16(&dstport, *argv, 0))
	invarg("dstport", *argv);
	} else if (!matches(*argv, "external")) {
	check_duparg(&attrs, IFLA_GENEVE_COLLECT_METADATA,
	argv, argv);
	metadata = true;
	} else if (!matches(*argv, "noexternal")) {
	check_duparg(&attrs, IFLA_GENEVE_COLLECT_METADATA,
	argv, argv);
	metadata = false;
	} else if (!matches(*argv, "udpcsum")) {
	check_duparg(&attrs, IFLA_GENEVE_UDP_CSUM, *argv,
	*argv);
	udpcsum = 1;
	} else if (!matches(*argv, "noudpcsum")) {
	check_duparg(&attrs, IFLA_GENEVE_UDP_CSUM, *argv,
	*argv);
	udpcsum = 0;
	} else if (!matches(*argv, "udp6zerocsumtx")) {
	check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
	argv, argv);
	udp6zerocsumtx = 1;
	} else if (!matches(*argv, "noudp6zerocsumtx")) {
	check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
	argv, argv);
	udp6zerocsumtx = 0;
	} else if (!matches(*argv, "udp6zerocsumrx")) {
	check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
	argv, argv);
	udp6zerocsumrx = 1;
	} else if (!matches(*argv, "noudp6zerocsumrx")) {
	check_duparg(&attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
	argv, argv);
	udp6zerocsumrx = 0;
	} else if (matches(*argv, "help") == 0) {
	explain();
	return -1;
	} else {
	fprintf(stderr, "geneve: unknown command \"%s\"?\n", *argv);
	explain();
	return -1;
	}
	argc--, argv++;
	}

	if (metadata && GENEVE_ATTRSET(attrs, IFLA_GENEVE_ID)) {
	fprintf(stderr, "geneve: both 'external' and vni cannot be specified\n");
	return -1;
	}

	if (!metadata) {
	/* parameter checking make sense only for full geneve tunnels */
	if (!GENEVE_ATTRSET(attrs, IFLA_GENEVE_ID)) {
	fprintf(stderr, "geneve: missing virtual network identifier\n");
	return -1;
	}

	/* If we are modifying the geneve device, then we only need the
	* ID (VNI) to identify the geneve device, and we do not need
	* the remote IP.
	*/
	if (!set_op && !is_addrtype_inet(&daddr)) {
	fprintf(stderr, "geneve: remote link partner not specified\n");
	return -1;
	}
	}

	addattr32(n, 1024, IFLA_GENEVE_ID, vni);
	if (is_addrtype_inet(&daddr)) {
	int type = (daddr.family == AF_INET) ? IFLA_GENEVE_REMOTE :
	IFLA_GENEVE_REMOTE6;
	addattr_l(n, 1024, type, daddr.data, daddr.bytelen);
	}
	if (!set_op \|\| GENEVE_ATTRSET(attrs, IFLA_GENEVE_LABEL))
	addattr32(n, 1024, IFLA_GENEVE_LABEL, label);
	if (!set_op \|\| GENEVE_ATTRSET(attrs, IFLA_GENEVE_TTL))
	addattr8(n, 1024, IFLA_GENEVE_TTL, ttl);
	if (!set_op \|\| GENEVE_ATTRSET(attrs, IFLA_GENEVE_TOS))
	addattr8(n, 1024, IFLA_GENEVE_TOS, tos);
	if (dstport)
	addattr16(n, 1024, IFLA_GENEVE_PORT, htons(dstport));
	if (metadata)
	addattr(n, 1024, IFLA_GENEVE_COLLECT_METADATA);
	if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_CSUM))
	addattr8(n, 1024, IFLA_GENEVE_UDP_CSUM, udpcsum);
	if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_TX))
	addattr8(n, 1024, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, udp6zerocsumtx);
	if (GENEVE_ATTRSET(attrs, IFLA_GENEVE_UDP_ZERO_CSUM6_RX))
	addattr8(n, 1024, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);

	return 0;
	}

	static void geneve_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	{
	__u32 vni;
	__u8 ttl = 0;
	__u8 tos = 0;

	if (!tb)
	return;

	if (tb[IFLA_GENEVE_COLLECT_METADATA]) {
	print_bool(PRINT_ANY, "external", "external ", true);
	return;
	}

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

	vni = rta_getattr_u32(tb[IFLA_GENEVE_ID]);
	print_uint(PRINT_ANY, "id", "id %u ", vni);

	if (tb[IFLA_GENEVE_REMOTE]) {
	__be32 addr = rta_getattr_u32(tb[IFLA_GENEVE_REMOTE]);

	if (addr)
	print_string(PRINT_ANY,
	"remote",
	"remote %s ",
	format_host(AF_INET, 4, &addr));
	} else if (tb[IFLA_GENEVE_REMOTE6]) {
	struct in6_addr addr;

	memcpy(&addr, RTA_DATA(tb[IFLA_GENEVE_REMOTE6]), sizeof(struct in6_addr));
	if (!IN6_IS_ADDR_UNSPECIFIED(&addr)) {
	if (!IN6_IS_ADDR_MULTICAST(&addr))
	print_string(PRINT_ANY,
	"remote6",
	"remote %s ",
	format_host(AF_INET6,
	sizeof(struct in6_addr),
	&addr));
	}
	}

	if (tb[IFLA_GENEVE_TTL_INHERIT] &&
	rta_getattr_u8(tb[IFLA_GENEVE_TTL_INHERIT])) {
	print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
	} else if (tb[IFLA_GENEVE_TTL]) {
	ttl = rta_getattr_u8(tb[IFLA_GENEVE_TTL]);
	if (is_json_context() \|\| ttl)
	print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
	else
	print_string(PRINT_FP, NULL, "ttl %s ", "auto");
	}

	if (tb[IFLA_GENEVE_TOS])
	tos = rta_getattr_u8(tb[IFLA_GENEVE_TOS]);
	if (tos) {
	if (is_json_context() \|\| tos != 1)
	print_0xhex(PRINT_ANY, "tos", "tos %#llx ", tos);
	else
	print_string(PRINT_FP, NULL, "tos %s ", "inherit");
	}

	if (tb[IFLA_GENEVE_DF]) {
	enum ifla_geneve_df df = rta_getattr_u8(tb[IFLA_GENEVE_DF]);

	if (df == GENEVE_DF_UNSET)
	print_string(PRINT_JSON, "df", "df %s ", "unset");
	else if (df == GENEVE_DF_SET)
	print_string(PRINT_ANY, "df", "df %s ", "set");
	else if (df == GENEVE_DF_INHERIT)
	print_string(PRINT_ANY, "df", "df %s ", "inherit");
	}

	if (tb[IFLA_GENEVE_LABEL]) {
	__u32 label = rta_getattr_u32(tb[IFLA_GENEVE_LABEL]);

	if (label)
	print_0xhex(PRINT_ANY,
	"label", "flowlabel %#llx ",
	ntohl(label));
	}

	if (tb[IFLA_GENEVE_PORT])
	print_uint(PRINT_ANY,
	"port",
	"dstport %u ",
	rta_getattr_be16(tb[IFLA_GENEVE_PORT]));

	if (tb[IFLA_GENEVE_UDP_CSUM]) {
	if (is_json_context()) {
	print_bool(PRINT_JSON,
	"udp_csum",
	NULL,
	rta_getattr_u8(tb[IFLA_GENEVE_UDP_CSUM]));
	} else {
	if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_CSUM]))
	fputs("no", f);
	fputs("udpcsum ", f);
	}
	}

	if (tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
	if (is_json_context()) {
	print_bool(PRINT_JSON,
	"udp_zero_csum6_tx",
	NULL,
	rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]));
	} else {
	if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
	fputs("no", f);
	fputs("udp6zerocsumtx ", f);
	}
	}

	if (tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
	if (is_json_context()) {
	print_bool(PRINT_JSON,
	"udp_zero_csum6_rx",
	NULL,
	rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]));
	} else {
	if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
	fputs("no", f);
	fputs("udp6zerocsumrx ", f);
	}
	}
	}

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

	struct link_util geneve_link_util = {
	.id = "geneve",
	.maxattr = IFLA_GENEVE_MAX,
	.parse_opt = geneve_parse_opt,
	.print_opt = geneve_print_opt,
	.print_help = geneve_print_help,
	};