[mirror_iproute2.git] / ip / link_ip6tnl.c

/*
 * link_ip6tnl.c	ip6tnl driver module
 *
 *		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:	Nicolas Dichtel <nicolas.dichtel@6wind.com>
 *
 */

#include <string.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#include <linux/ip.h>
#include <linux/if_tunnel.h>
#include <linux/ip6_tunnel.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#include "tunnel.h"

#define IP6_FLOWINFO_TCLASS	htonl(0x0FF00000)
#define IP6_FLOWINFO_FLOWLABEL	htonl(0x000FFFFF)

#define DEFAULT_TNL_HOP_LIMIT	(64)

static void print_usage(FILE *f)
{
	fprintf(f,
		"Usage: ... ip6tnl [ mode { ip6ip6 | ipip6 | any } ]\n"
		"                  [ remote ADDR ]\n"
		"                  [ local ADDR ]\n"
		"                  [ dev PHYS_DEV ]\n"
		"                  [ encaplimit ELIM ]\n"
		"                  [ hoplimit HLIM ]\n"
		"                  [ tclass TCLASS ]\n"
		"                  [ flowlabel FLOWLABEL ]\n"
		"                  [ dscp inherit ]\n"
		"                  [ fwmark MARK ]\n"
		"                  [ [no]allow-localremote ]\n"
		"                  [ noencap ]\n"
		"                  [ encap { fou | gue | none } ]\n"
		"                  [ encap-sport PORT ]\n"
		"                  [ encap-dport PORT ]\n"
		"                  [ [no]encap-csum ]\n"
		"                  [ [no]encap-csum6 ]\n"
		"                  [ [no]encap-remcsum ]\n"
		"                  [ external ]\n"
		"\n"
		"Where: ADDR      := IPV6_ADDRESS\n"
		"       ELIM      := { none | 0..255 }(default=%d)\n"
		"       HLIM      := 0..255 (default=%d)\n"
		"       TCLASS    := { 0x0..0xff | inherit }\n"
		"       FLOWLABEL := { 0x0..0xfffff | inherit }\n"
		"       MARK      := { 0x0..0xffffffff | inherit }\n",
		IPV6_DEFAULT_TNL_ENCAP_LIMIT, DEFAULT_TNL_HOP_LIMIT
	);
}

static void usage(void) __attribute__((noreturn));
static void usage(void)
{
	print_usage(stderr);
	exit(-1);
}

static int ip6tunnel_parse_opt(struct link_util *lu, int argc, char **argv,
			       struct nlmsghdr *n)
{
	struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
	struct {
		struct nlmsghdr n;
		struct ifinfomsg i;
	} req = {
		.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
		.n.nlmsg_flags = NLM_F_REQUEST,
		.n.nlmsg_type = RTM_GETLINK,
		.i.ifi_family = preferred_family,
		.i.ifi_index = ifi->ifi_index,
	};
	struct nlmsghdr *answer;
	struct rtattr *tb[IFLA_MAX + 1];
	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
	struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
	int len;
	struct in6_addr laddr = IN6ADDR_ANY_INIT;
	struct in6_addr raddr = IN6ADDR_ANY_INIT;
	__u8 hop_limit = DEFAULT_TNL_HOP_LIMIT;
	__u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
	__u32 flowinfo = 0;
	__u32 flags = 0;
	__u32 link = 0;
	__u8 proto = 0;
	__u16 encaptype = 0;
	__u16 encapflags = TUNNEL_ENCAP_FLAG_CSUM6;
	__u16 encapsport = 0;
	__u16 encapdport = 0;
	__u8 metadata = 0;
	__u32 fwmark = 0;

	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
		if (rtnl_talk(&rth, &req.n, &answer) < 0) {
get_failed:
			fprintf(stderr,
				"Failed to get existing tunnel info.\n");
			return -1;
		}

		len = answer->nlmsg_len;
		len -= NLMSG_LENGTH(sizeof(*ifi));
		if (len < 0)
			goto get_failed;

		parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);

		if (!tb[IFLA_LINKINFO])
			goto get_failed;

		parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);

		if (!linkinfo[IFLA_INFO_DATA])
			goto get_failed;

		parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
				    linkinfo[IFLA_INFO_DATA]);

		if (iptuninfo[IFLA_IPTUN_LOCAL])
			memcpy(&laddr, RTA_DATA(iptuninfo[IFLA_IPTUN_LOCAL]),
			       sizeof(laddr));

		if (iptuninfo[IFLA_IPTUN_REMOTE])
			memcpy(&raddr, RTA_DATA(iptuninfo[IFLA_IPTUN_REMOTE]),
			       sizeof(raddr));

		if (iptuninfo[IFLA_IPTUN_TTL])
			hop_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);

		if (iptuninfo[IFLA_IPTUN_ENCAP_LIMIT])
			encap_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]);

		if (iptuninfo[IFLA_IPTUN_FLOWINFO])
			flowinfo = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLOWINFO]);

		if (iptuninfo[IFLA_IPTUN_FLAGS])
			flags = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLAGS]);

		if (iptuninfo[IFLA_IPTUN_LINK])
			link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);

		if (iptuninfo[IFLA_IPTUN_PROTO])
			proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
		if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA])
			metadata = 1;

		if (iptuninfo[IFLA_IPTUN_FWMARK])
			fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]);

		free(answer);
	}

	while (argc > 0) {
		if (matches(*argv, "mode") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "ipv6/ipv6") == 0 ||
			    strcmp(*argv, "ip6ip6") == 0)
				proto = IPPROTO_IPV6;
			else if (strcmp(*argv, "ip/ipv6") == 0 ||
				 strcmp(*argv, "ipv4/ipv6") == 0 ||
				 strcmp(*argv, "ipip6") == 0 ||
				 strcmp(*argv, "ip4ip6") == 0)
				proto = IPPROTO_IPIP;
			else if (strcmp(*argv, "any/ipv6") == 0 ||
				 strcmp(*argv, "any") == 0)
				proto = 0;
			else
				invarg("Cannot guess tunnel mode.", *argv);
		} else if (strcmp(*argv, "remote") == 0) {
			inet_prefix addr;

			NEXT_ARG();
			get_addr(&addr, *argv, AF_INET6);
			memcpy(&raddr, addr.data, sizeof(raddr));
		} else if (strcmp(*argv, "local") == 0) {
			inet_prefix addr;

			NEXT_ARG();
			get_addr(&addr, *argv, AF_INET6);
			memcpy(&laddr, addr.data, sizeof(laddr));
		} else if (matches(*argv, "dev") == 0) {
			NEXT_ARG();
			link = if_nametoindex(*argv);
			if (link == 0)
				invarg("\"dev\" is invalid", *argv);
		} else if (strcmp(*argv, "hoplimit") == 0 ||
			   strcmp(*argv, "ttl") == 0 ||
			   strcmp(*argv, "hlim") == 0) {
			__u8 uval;

			NEXT_ARG();
			if (get_u8(&uval, *argv, 0))
				invarg("invalid HLIM", *argv);
			hop_limit = uval;
		} else if (strcmp(*argv, "encaplimit") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "none") == 0) {
				flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
			} else {
				__u8 uval;

				if (get_u8(&uval, *argv, 0) < -1)
					invarg("invalid ELIM", *argv);
				encap_limit = uval;
				flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
			}
		} else if (strcmp(*argv, "tclass") == 0 ||
			   strcmp(*argv, "tc") == 0 ||
			   strcmp(*argv, "tos") == 0 ||
			   matches(*argv, "dsfield") == 0) {
			__u8 uval;

			NEXT_ARG();
			flowinfo &= ~IP6_FLOWINFO_TCLASS;
			if (strcmp(*argv, "inherit") == 0)
				flags |= IP6_TNL_F_USE_ORIG_TCLASS;
			else {
				if (get_u8(&uval, *argv, 16))
					invarg("invalid TClass", *argv);
				flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
				flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
			}
		} else if (strcmp(*argv, "flowlabel") == 0 ||
			   strcmp(*argv, "fl") == 0) {
			__u32 uval;

			NEXT_ARG();
			flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
			if (strcmp(*argv, "inherit") == 0)
				flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
			else {
				if (get_u32(&uval, *argv, 16))
					invarg("invalid Flowlabel", *argv);
				if (uval > 0xFFFFF)
					invarg("invalid Flowlabel", *argv);
				flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
				flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
			}
		} else if (strcmp(*argv, "dscp") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "inherit") != 0)
				invarg("not inherit", *argv);
			flags |= IP6_TNL_F_RCV_DSCP_COPY;
		} else if (strcmp(*argv, "fwmark") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "inherit") == 0) {
				flags |= IP6_TNL_F_USE_ORIG_FWMARK;
				fwmark = 0;
			} else {
				if (get_u32(&fwmark, *argv, 0))
					invarg("invalid fwmark\n", *argv);
				flags &= ~IP6_TNL_F_USE_ORIG_FWMARK;
			}
		} else if (strcmp(*argv, "allow-localremote") == 0) {
			flags |= IP6_TNL_F_ALLOW_LOCAL_REMOTE;
		} else if (strcmp(*argv, "noallow-localremote") == 0) {
			flags &= ~IP6_TNL_F_ALLOW_LOCAL_REMOTE;
		} else if (strcmp(*argv, "noencap") == 0) {
			encaptype = TUNNEL_ENCAP_NONE;
		} else if (strcmp(*argv, "encap") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "fou") == 0)
				encaptype = TUNNEL_ENCAP_FOU;
			else if (strcmp(*argv, "gue") == 0)
				encaptype = TUNNEL_ENCAP_GUE;
			else if (strcmp(*argv, "none") == 0)
				encaptype = TUNNEL_ENCAP_NONE;
			else
				invarg("Invalid encap type.", *argv);
		} else if (strcmp(*argv, "encap-sport") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "auto") == 0)
				encapsport = 0;
			else if (get_u16(&encapsport, *argv, 0))
				invarg("Invalid source port.", *argv);
		} else if (strcmp(*argv, "encap-dport") == 0) {
			NEXT_ARG();
			if (get_u16(&encapdport, *argv, 0))
				invarg("Invalid destination port.", *argv);
		} else if (strcmp(*argv, "encap-csum") == 0) {
			encapflags |= TUNNEL_ENCAP_FLAG_CSUM;
		} else if (strcmp(*argv, "noencap-csum") == 0) {
			encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
		} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
			encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
		} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
			encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
		} else if (strcmp(*argv, "encap-remcsum") == 0) {
			encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
		} else if (strcmp(*argv, "noencap-remcsum") == 0) {
			encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
		} else if (strcmp(*argv, "external") == 0) {
			metadata = 1;
		} else
			usage();
		argc--, argv++;
	}

	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
	if (metadata) {
		addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
		return 0;
	}
	addattr_l(n, 1024, IFLA_IPTUN_LOCAL, &laddr, sizeof(laddr));
	addattr_l(n, 1024, IFLA_IPTUN_REMOTE, &raddr, sizeof(raddr));
	addattr8(n, 1024, IFLA_IPTUN_TTL, hop_limit);
	addattr8(n, 1024, IFLA_IPTUN_ENCAP_LIMIT, encap_limit);
	addattr32(n, 1024, IFLA_IPTUN_FLOWINFO, flowinfo);
	addattr32(n, 1024, IFLA_IPTUN_FLAGS, flags);
	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
	addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);

	addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
	addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
	addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
	addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));

	return 0;
}

static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
	char s2[64];
	int flags = 0;
	__u32 flowinfo = 0;

	if (!tb)
		return;

	if (tb[IFLA_IPTUN_COLLECT_METADATA])
		print_bool(PRINT_ANY, "external", "external ", true);

	if (tb[IFLA_IPTUN_FLAGS])
		flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]);

	if (tb[IFLA_IPTUN_FLOWINFO])
		flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]);

	if (tb[IFLA_IPTUN_PROTO]) {
		switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
		case IPPROTO_IPIP:
			print_string(PRINT_ANY, "proto", "%s ", "ipip6");
			break;
		case IPPROTO_IPV6:
			print_string(PRINT_ANY, "proto", "%s ", "ip6ip6");
			break;
		case 0:
			print_string(PRINT_ANY, "proto", "%s ", "any");
			break;
		}
	}

	if (tb[IFLA_IPTUN_REMOTE]) {
		print_string(PRINT_ANY,
			     "remote",
			     "remote %s ",
			     rt_addr_n2a_rta(AF_INET6, tb[IFLA_IPTUN_REMOTE]));
	}

	if (tb[IFLA_IPTUN_LOCAL]) {
		print_string(PRINT_ANY,
			     "local",
			     "local %s ",
			     rt_addr_n2a_rta(AF_INET6, tb[IFLA_IPTUN_LOCAL]));
	}

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

		if (n)
			print_string(PRINT_ANY, "link", "dev %s ", n);
		else
			print_uint(PRINT_ANY, "link_index", "dev %u ", link);
	}

	if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
		print_bool(PRINT_ANY,
			   "ip6_tnl_f_ign_encap_limit",
			   "encaplimit none ",
			   true);
	else if (tb[IFLA_IPTUN_ENCAP_LIMIT])
		print_uint(PRINT_ANY,
			   "encap_limit",
			   "encaplimit %u ",
			   rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]));

	if (tb[IFLA_IPTUN_TTL])
		print_uint(PRINT_ANY,
			   "ttl",
			   "hoplimit %u ",
			   rta_getattr_u8(tb[IFLA_IPTUN_TTL]));

	if (flags & IP6_TNL_F_USE_ORIG_TCLASS) {
		print_bool(PRINT_ANY,
			   "ip6_tnl_f_use_orig_tclass",
			   "tclass inherit ",
			   true);
	} else if (tb[IFLA_IPTUN_FLOWINFO]) {
		__u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS) >> 20;

		snprintf(s2, sizeof(s2), "0x%02x", val);
		print_string(PRINT_ANY, "tclass", "tclass %s ", s2);
	}

	if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) {
		print_bool(PRINT_ANY,
			   "ip6_tnl_f_use_orig_flowlabel",
			   "flowlabel inherit ",
			   true);
	} else {
		if (is_json_context()) {
			SPRINT_BUF(b1);

			snprintf(b1, sizeof(b1), "0x%05x",
				 ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
			print_string(PRINT_JSON, "flowlabel", NULL, b1);
		} else {
			printf("flowlabel 0x%05x ",
			       ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
		}
	}

	if (flags & IP6_TNL_F_RCV_DSCP_COPY)
		print_bool(PRINT_ANY,
			   "ip6_tnl_f_rcv_dscp_copy",
			   "dscp inherit ",
			   true);

	if (flags & IP6_TNL_F_MIP6_DEV)
		print_bool(PRINT_ANY, "ip6_tnl_f_mip6_dev", "mip6 ", true);

	if (flags & IP6_TNL_F_USE_ORIG_FWMARK) {
		print_bool(PRINT_ANY,
			   "ip6_tnl_f_use_orig_fwmark",
			   "fwmark inherit ",
			   true);
	} else if (tb[IFLA_IPTUN_FWMARK]) {
		__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);

		if (fwmark) {
			SPRINT_BUF(b1);

			snprintf(b1, sizeof(b1), "0x%x", fwmark);
			print_string(PRINT_ANY, "fwmark", "fwmark %s ", b1);
		}
	}

	if (flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE)
		print_bool(PRINT_ANY,
			   "ip6_tnl_f_allow_local_remote",
			   "allow-localremote ",
			   true);

	if (tb[IFLA_IPTUN_ENCAP_TYPE] &&
	    rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) {
		__u16 type = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE]);
		__u16 flags = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_FLAGS]);
		__u16 sport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_SPORT]);
		__u16 dport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_DPORT]);

		open_json_object("encap");
		print_string(PRINT_FP, NULL, "encap ", NULL);
		switch (type) {
		case TUNNEL_ENCAP_FOU:
			print_string(PRINT_ANY, "type", "%s ", "fou");
			break;
		case TUNNEL_ENCAP_GUE:
			print_string(PRINT_ANY, "type", "%s ", "gue");
			break;
		default:
			print_null(PRINT_ANY, "type", "unknown ", NULL);
			break;
		}

		if (is_json_context()) {
			print_uint(PRINT_JSON,
				   "sport",
				   NULL,
				   sport ? ntohs(sport) : 0);
			print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
			print_bool(PRINT_JSON, "csum", NULL,
				   flags & TUNNEL_ENCAP_FLAG_CSUM);
			print_bool(PRINT_JSON, "csum6", NULL,
				   flags & TUNNEL_ENCAP_FLAG_CSUM6);
			print_bool(PRINT_JSON, "remcsum", NULL,
				   flags & TUNNEL_ENCAP_FLAG_REMCSUM);
			close_json_object();
		} else {
			if (sport == 0)
				fputs("encap-sport auto ", f);
			else
				fprintf(f, "encap-sport %u", ntohs(sport));

			fprintf(f, "encap-dport %u ", ntohs(dport));

			if (flags & TUNNEL_ENCAP_FLAG_CSUM)
				fputs("encap-csum ", f);
			else
				fputs("noencap-csum ", f);

			if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
				fputs("encap-csum6 ", f);
			else
				fputs("noencap-csum6 ", f);

			if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
				fputs("encap-remcsum ", f);
			else
				fputs("noencap-remcsum ", f);
		}
	}
}

static void ip6tunnel_print_help(struct link_util *lu, int argc, char **argv,
				 FILE *f)
{
	print_usage(f);
}

struct link_util ip6tnl_link_util = {
	.id = "ip6tnl",
	.maxattr = IFLA_IPTUN_MAX,
	.parse_opt = ip6tunnel_parse_opt,
	.print_opt = ip6tunnel_print_opt,
	.print_help = ip6tunnel_print_help,
};
Commit	Line	Data
9d0efc10 ND	1	/*
	2	* link_ip6tnl.c ip6tnl driver module
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Nicolas Dichtel <nicolas.dichtel@6wind.com>
	10	*
	11	*/
	12
	13	#include <string.h>
	14	#include <net/if.h>
	15	#include <sys/types.h>
	16	#include <sys/socket.h>
	17	#include <arpa/inet.h>
	18
	19	#include <linux/ip.h>
	20	#include <linux/if_tunnel.h>
	21	#include <linux/ip6_tunnel.h>
	22	#include "rt_names.h"
	23	#include "utils.h"
	24	#include "ip_common.h"
	25	#include "tunnel.h"
	26
	27	#define IP6_FLOWINFO_TCLASS htonl(0x0FF00000)
	28	#define IP6_FLOWINFO_FLOWLABEL htonl(0x000FFFFF)
	29
	30	#define DEFAULT_TNL_HOP_LIMIT (64)
	31
561e650e	32	static void print_usage(FILE *f)
9d0efc10	33	{
8b471354 PS	34	fprintf(f,
	35	"Usage: ... ip6tnl [ mode { ip6ip6 \| ipip6 \| any } ]\n"
	36	" [ remote ADDR ]\n"
	37	" [ local ADDR ]\n"
	38	" [ dev PHYS_DEV ]\n"
	39	" [ encaplimit ELIM ]\n"
	40	" [ hoplimit HLIM ]\n"
	41	" [ tclass TCLASS ]\n"
	42	" [ flowlabel FLOWLABEL ]\n"
	43	" [ dscp inherit ]\n"
ad4b1425	44	" [ fwmark MARK ]\n"
21440d19	45	" [ [no]allow-localremote ]\n"
8b471354 PS	46	" [ noencap ]\n"
	47	" [ encap { fou \| gue \| none } ]\n"
	48	" [ encap-sport PORT ]\n"
	49	" [ encap-dport PORT ]\n"
	50	" [ [no]encap-csum ]\n"
	51	" [ [no]encap-csum6 ]\n"
	52	" [ [no]encap-remcsum ]\n"
	53	" [ external ]\n"
	54	"\n"
	55	"Where: ADDR := IPV6_ADDRESS\n"
	56	" ELIM := { none \| 0..255 }(default=%d)\n"
	57	" HLIM := 0..255 (default=%d)\n"
	58	" TCLASS := { 0x0..0xff \| inherit }\n"
ad4b1425 CG	59	" FLOWLABEL := { 0x0..0xfffff \| inherit }\n"
ad4b1425 CG	60	" MARK := { 0x0..0xffffffff \| inherit }\n",
8b471354 PS	61	IPV6_DEFAULT_TNL_ENCAP_LIMIT, DEFAULT_TNL_HOP_LIMIT
8b471354 PS	62	);
561e650e	63	}
	64
	65	static void usage(void) __attribute__((noreturn));
	66	static void usage(void)
	67	{
	68	print_usage(stderr);
9d0efc10 ND	69	exit(-1);
	70	}
	71
	72	static int ip6tunnel_parse_opt(struct link_util lu, int argc, char *argv,
	73	struct nlmsghdr *n)
	74	{
d17b136f	75	struct ifinfomsg ifi = (struct ifinfomsg )(n + 1);
9d0efc10 ND	76	struct {
	77	struct nlmsghdr n;
	78	struct ifinfomsg i;
d17b136f PS	79	} req = {
	80	.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
	81	.n.nlmsg_flags = NLM_F_REQUEST,
	82	.n.nlmsg_type = RTM_GETLINK,
	83	.i.ifi_family = preferred_family,
	84	.i.ifi_index = ifi->ifi_index,
	85	};
08ede25f	86	struct nlmsghdr *answer;
9d0efc10 ND	87	struct rtattr *tb[IFLA_MAX + 1];
	88	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
	89	struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
	90	int len;
95614cc8 SP	91	struct in6_addr laddr = IN6ADDR_ANY_INIT;
95614cc8 SP	92	struct in6_addr raddr = IN6ADDR_ANY_INIT;
9d0efc10 ND	93	__u8 hop_limit = DEFAULT_TNL_HOP_LIMIT;
	94	__u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
	95	__u32 flowinfo = 0;
	96	__u32 flags = 0;
	97	__u32 link = 0;
	98	__u8 proto = 0;
73516e12 TH	99	__u16 encaptype = 0;
	100	__u16 encapflags = TUNNEL_ENCAP_FLAG_CSUM6;
	101	__u16 encapsport = 0;
	102	__u16 encapdport = 0;
4bfe6825	103	__u8 metadata = 0;
ad4b1425	104	__u32 fwmark = 0;
9d0efc10	105
9d0efc10	106	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
86bf43c7	107	if (rtnl_talk(&rth, &req.n, &answer) < 0) {
9d0efc10 ND	108	get_failed:
	109	fprintf(stderr,
	110	"Failed to get existing tunnel info.\n");
	111	return -1;
	112	}
	113
86bf43c7	114	len = answer->nlmsg_len;
9d0efc10 ND	115	len -= NLMSG_LENGTH(sizeof(*ifi));
	116	if (len < 0)
	117	goto get_failed;
	118
86bf43c7	119	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
9d0efc10 ND	120
	121	if (!tb[IFLA_LINKINFO])
	122	goto get_failed;
	123
	124	parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
	125
	126	if (!linkinfo[IFLA_INFO_DATA])
	127	goto get_failed;
	128
	129	parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
	130	linkinfo[IFLA_INFO_DATA]);
	131
	132	if (iptuninfo[IFLA_IPTUN_LOCAL])
	133	memcpy(&laddr, RTA_DATA(iptuninfo[IFLA_IPTUN_LOCAL]),
	134	sizeof(laddr));
	135
	136	if (iptuninfo[IFLA_IPTUN_REMOTE])
	137	memcpy(&raddr, RTA_DATA(iptuninfo[IFLA_IPTUN_REMOTE]),
	138	sizeof(raddr));
	139
	140	if (iptuninfo[IFLA_IPTUN_TTL])
	141	hop_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
	142
	143	if (iptuninfo[IFLA_IPTUN_ENCAP_LIMIT])
	144	encap_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]);
	145
	146	if (iptuninfo[IFLA_IPTUN_FLOWINFO])
	147	flowinfo = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLOWINFO]);
	148
	149	if (iptuninfo[IFLA_IPTUN_FLAGS])
	150	flags = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLAGS]);
	151
	152	if (iptuninfo[IFLA_IPTUN_LINK])
	153	link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
	154
	155	if (iptuninfo[IFLA_IPTUN_PROTO])
	156	proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
4bfe6825 AS	157	if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA])
4bfe6825 AS	158	metadata = 1;
ad4b1425 CG	159
	160	if (iptuninfo[IFLA_IPTUN_FWMARK])
	161	fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]);
86bf43c7 HL	162
86bf43c7 HL	163	free(answer);
9d0efc10 ND	164	}
	165
	166	while (argc > 0) {
	167	if (matches(*argv, "mode") == 0) {
	168	NEXT_ARG();
	169	if (strcmp(*argv, "ipv6/ipv6") == 0 \|\|
	170	strcmp(*argv, "ip6ip6") == 0)
	171	proto = IPPROTO_IPV6;
	172	else if (strcmp(*argv, "ip/ipv6") == 0 \|\|
	173	strcmp(*argv, "ipv4/ipv6") == 0 \|\|
	174	strcmp(*argv, "ipip6") == 0 \|\|
	175	strcmp(*argv, "ip4ip6") == 0)
	176	proto = IPPROTO_IPIP;
	177	else if (strcmp(*argv, "any/ipv6") == 0 \|\|
	178	strcmp(*argv, "any") == 0)
	179	proto = 0;
	180	else
	181	invarg("Cannot guess tunnel mode.", *argv);
	182	} else if (strcmp(*argv, "remote") == 0) {
	183	inet_prefix addr;
56f5daac	184
9d0efc10	185	NEXT_ARG();
9aceaad7 SP	186	get_addr(&addr, *argv, AF_INET6);
9aceaad7 SP	187	memcpy(&raddr, addr.data, sizeof(raddr));
9d0efc10 ND	188	} else if (strcmp(*argv, "local") == 0) {
9d0efc10 ND	189	inet_prefix addr;
56f5daac	190
9d0efc10	191	NEXT_ARG();
9aceaad7 SP	192	get_addr(&addr, *argv, AF_INET6);
9aceaad7 SP	193	memcpy(&laddr, addr.data, sizeof(laddr));
9d0efc10 ND	194	} else if (matches(*argv, "dev") == 0) {
	195	NEXT_ARG();
	196	link = if_nametoindex(*argv);
	197	if (link == 0)
	198	invarg("\"dev\" is invalid", *argv);
	199	} else if (strcmp(*argv, "hoplimit") == 0 \|\|
	200	strcmp(*argv, "ttl") == 0 \|\|
	201	strcmp(*argv, "hlim") == 0) {
	202	__u8 uval;
56f5daac	203
9d0efc10 ND	204	NEXT_ARG();
	205	if (get_u8(&uval, *argv, 0))
	206	invarg("invalid HLIM", *argv);
	207	hop_limit = uval;
73516e12	208	} else if (strcmp(*argv, "encaplimit") == 0) {
9d0efc10 ND	209	NEXT_ARG();
	210	if (strcmp(*argv, "none") == 0) {
	211	flags \|= IP6_TNL_F_IGN_ENCAP_LIMIT;
	212	} else {
	213	__u8 uval;
56f5daac	214
9d0efc10 ND	215	if (get_u8(&uval, *argv, 0) < -1)
	216	invarg("invalid ELIM", *argv);
	217	encap_limit = uval;
	218	flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
	219	}
	220	} else if (strcmp(*argv, "tclass") == 0 \|\|
	221	strcmp(*argv, "tc") == 0 \|\|
	222	strcmp(*argv, "tos") == 0 \|\|
	223	matches(*argv, "dsfield") == 0) {
	224	__u8 uval;
56f5daac	225
9d0efc10 ND	226	NEXT_ARG();
	227	flowinfo &= ~IP6_FLOWINFO_TCLASS;
	228	if (strcmp(*argv, "inherit") == 0)
	229	flags \|= IP6_TNL_F_USE_ORIG_TCLASS;
	230	else {
	231	if (get_u8(&uval, *argv, 16))
	232	invarg("invalid TClass", *argv);
	233	flowinfo \|= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
	234	flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
	235	}
	236	} else if (strcmp(*argv, "flowlabel") == 0 \|\|
	237	strcmp(*argv, "fl") == 0) {
	238	__u32 uval;
56f5daac	239
9d0efc10 ND	240	NEXT_ARG();
	241	flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
	242	if (strcmp(*argv, "inherit") == 0)
	243	flags \|= IP6_TNL_F_USE_ORIG_FLOWLABEL;
	244	else {
	245	if (get_u32(&uval, *argv, 16))
	246	invarg("invalid Flowlabel", *argv);
	247	if (uval > 0xFFFFF)
	248	invarg("invalid Flowlabel", *argv);
	249	flowinfo \|= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
	250	flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
	251	}
	252	} else if (strcmp(*argv, "dscp") == 0) {
	253	NEXT_ARG();
	254	if (strcmp(*argv, "inherit") != 0)
	255	invarg("not inherit", *argv);
	256	flags \|= IP6_TNL_F_RCV_DSCP_COPY;
	257	} else if (strcmp(*argv, "fwmark") == 0) {
	258	NEXT_ARG();
ad4b1425 CG	259	if (strcmp(*argv, "inherit") == 0) {
	260	flags \|= IP6_TNL_F_USE_ORIG_FWMARK;
	261	fwmark = 0;
	262	} else {
	263	if (get_u32(&fwmark, *argv, 0))
	264	invarg("invalid fwmark\n", *argv);
	265	flags &= ~IP6_TNL_F_USE_ORIG_FWMARK;
	266	}
21440d19 SL	267	} else if (strcmp(*argv, "allow-localremote") == 0) {
	268	flags \|= IP6_TNL_F_ALLOW_LOCAL_REMOTE;
	269	} else if (strcmp(*argv, "noallow-localremote") == 0) {
	270	flags &= ~IP6_TNL_F_ALLOW_LOCAL_REMOTE;
73516e12 TH	271	} else if (strcmp(*argv, "noencap") == 0) {
	272	encaptype = TUNNEL_ENCAP_NONE;
	273	} else if (strcmp(*argv, "encap") == 0) {
	274	NEXT_ARG();
	275	if (strcmp(*argv, "fou") == 0)
	276	encaptype = TUNNEL_ENCAP_FOU;
	277	else if (strcmp(*argv, "gue") == 0)
	278	encaptype = TUNNEL_ENCAP_GUE;
	279	else if (strcmp(*argv, "none") == 0)
	280	encaptype = TUNNEL_ENCAP_NONE;
	281	else
	282	invarg("Invalid encap type.", *argv);
	283	} else if (strcmp(*argv, "encap-sport") == 0) {
	284	NEXT_ARG();
	285	if (strcmp(*argv, "auto") == 0)
	286	encapsport = 0;
	287	else if (get_u16(&encapsport, *argv, 0))
	288	invarg("Invalid source port.", *argv);
	289	} else if (strcmp(*argv, "encap-dport") == 0) {
	290	NEXT_ARG();
	291	if (get_u16(&encapdport, *argv, 0))
	292	invarg("Invalid destination port.", *argv);
	293	} else if (strcmp(*argv, "encap-csum") == 0) {
	294	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM;
	295	} else if (strcmp(*argv, "noencap-csum") == 0) {
	296	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
	297	} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
	298	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM6;
	299	} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
	300	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
	301	} else if (strcmp(*argv, "encap-remcsum") == 0) {
	302	encapflags \|= TUNNEL_ENCAP_FLAG_REMCSUM;
	303	} else if (strcmp(*argv, "noencap-remcsum") == 0) {
147ade01	304	encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
4bfe6825 AS	305	} else if (strcmp(*argv, "external") == 0) {
4bfe6825 AS	306	metadata = 1;
9d0efc10 ND	307	} else
	308	usage();
	309	argc--, argv++;
	310	}
	311
	312	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
4bfe6825 AS	313	if (metadata) {
	314	addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
	315	return 0;
	316	}
9d0efc10 ND	317	addattr_l(n, 1024, IFLA_IPTUN_LOCAL, &laddr, sizeof(laddr));
	318	addattr_l(n, 1024, IFLA_IPTUN_REMOTE, &raddr, sizeof(raddr));
	319	addattr8(n, 1024, IFLA_IPTUN_TTL, hop_limit);
	320	addattr8(n, 1024, IFLA_IPTUN_ENCAP_LIMIT, encap_limit);
	321	addattr32(n, 1024, IFLA_IPTUN_FLOWINFO, flowinfo);
	322	addattr32(n, 1024, IFLA_IPTUN_FLAGS, flags);
	323	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
ad4b1425	324	addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);
9d0efc10	325
73516e12 TH	326	addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
	327	addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
	328	addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
	329	addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));
	330
9d0efc10 ND	331	return 0;
	332	}
	333
	334	static void ip6tunnel_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	335	{
9d0efc10 ND	336	char s2[64];
	337	int flags = 0;
	338	__u32 flowinfo = 0;
	339
	340	if (!tb)
	341	return;
	342
7b178324 PD	343	if (tb[IFLA_IPTUN_COLLECT_METADATA])
	344	print_bool(PRINT_ANY, "external", "external ", true);
	345
9d0efc10 ND	346	if (tb[IFLA_IPTUN_FLAGS])
	347	flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]);
	348
	349	if (tb[IFLA_IPTUN_FLOWINFO])
	350	flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]);
	351
	352	if (tb[IFLA_IPTUN_PROTO]) {
	353	switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
	354	case IPPROTO_IPIP:
1facc1c6	355	print_string(PRINT_ANY, "proto", "%s ", "ipip6");
9d0efc10 ND	356	break;
9d0efc10 ND	357	case IPPROTO_IPV6:
1facc1c6	358	print_string(PRINT_ANY, "proto", "%s ", "ip6ip6");
9d0efc10 ND	359	break;
9d0efc10 ND	360	case 0:
1facc1c6	361	print_string(PRINT_ANY, "proto", "%s ", "any");
9d0efc10 ND	362	break;
	363	}
	364	}
	365
	366	if (tb[IFLA_IPTUN_REMOTE]) {
1facc1c6 JF	367	print_string(PRINT_ANY,
	368	"remote",
	369	"remote %s ",
	370	rt_addr_n2a_rta(AF_INET6, tb[IFLA_IPTUN_REMOTE]));
9d0efc10 ND	371	}
	372
	373	if (tb[IFLA_IPTUN_LOCAL]) {
1facc1c6 JF	374	print_string(PRINT_ANY,
	375	"local",
	376	"local %s ",
	377	rt_addr_n2a_rta(AF_INET6, tb[IFLA_IPTUN_LOCAL]));
9d0efc10 ND	378	}
	379
	380	if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) {
56f5daac	381	unsigned int link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
9d0efc10 ND	382	const char *n = if_indextoname(link, s2);
	383
	384	if (n)
1facc1c6	385	print_string(PRINT_ANY, "link", "dev %s ", n);
9d0efc10	386	else
1facc1c6	387	print_uint(PRINT_ANY, "link_index", "dev %u ", link);
9d0efc10 ND	388	}
	389
	390	if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
1facc1c6 JF	391	print_bool(PRINT_ANY,
	392	"ip6_tnl_f_ign_encap_limit",
	393	"encaplimit none ",
	394	true);
9d0efc10	395	else if (tb[IFLA_IPTUN_ENCAP_LIMIT])
1facc1c6 JF	396	print_uint(PRINT_ANY,
	397	"encap_limit",
	398	"encaplimit %u ",
	399	rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]));
9d0efc10 ND	400
9d0efc10 ND	401	if (tb[IFLA_IPTUN_TTL])
1facc1c6 JF	402	print_uint(PRINT_ANY,
	403	"ttl",
	404	"hoplimit %u ",
	405	rta_getattr_u8(tb[IFLA_IPTUN_TTL]));
9d0efc10	406
090524f8	407	if (flags & IP6_TNL_F_USE_ORIG_TCLASS) {
1facc1c6 JF	408	print_bool(PRINT_ANY,
	409	"ip6_tnl_f_use_orig_tclass",
	410	"tclass inherit ",
	411	true);
090524f8 SP	412	} else if (tb[IFLA_IPTUN_FLOWINFO]) {
090524f8 SP	413	__u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS) >> 20;
9d0efc10	414
090524f8 SP	415	snprintf(s2, sizeof(s2), "0x%02x", val);
090524f8 SP	416	print_string(PRINT_ANY, "tclass", "tclass %s ", s2);
1facc1c6 JF	417	}
	418
	419	if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) {
	420	print_bool(PRINT_ANY,
	421	"ip6_tnl_f_use_orig_flowlabel",
	422	"flowlabel inherit ",
	423	true);
	424	} else {
	425	if (is_json_context()) {
	426	SPRINT_BUF(b1);
	427
	428	snprintf(b1, sizeof(b1), "0x%05x",
	429	ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
	430	print_string(PRINT_JSON, "flowlabel", NULL, b1);
	431	} else {
	432	printf("flowlabel 0x%05x ",
	433	ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
	434	}
9d0efc10 ND	435	}
9d0efc10 ND	436
9d0efc10	437	if (flags & IP6_TNL_F_RCV_DSCP_COPY)
1facc1c6 JF	438	print_bool(PRINT_ANY,
	439	"ip6_tnl_f_rcv_dscp_copy",
	440	"dscp inherit ",
	441	true);
9d0efc10 ND	442
9d0efc10 ND	443	if (flags & IP6_TNL_F_MIP6_DEV)
1facc1c6 JF	444	print_bool(PRINT_ANY, "ip6_tnl_f_mip6_dev", "mip6 ", true);
	445
	446	if (flags & IP6_TNL_F_USE_ORIG_FWMARK) {
	447	print_bool(PRINT_ANY,
	448	"ip6_tnl_f_use_orig_fwmark",
	449	"fwmark inherit ",
	450	true);
	451	} else if (tb[IFLA_IPTUN_FWMARK]) {
	452	__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
9d0efc10	453
1facc1c6 JF	454	if (fwmark) {
	455	SPRINT_BUF(b1);
	456
	457	snprintf(b1, sizeof(b1), "0x%x", fwmark);
	458	print_string(PRINT_ANY, "fwmark", "fwmark %s ", b1);
	459	}
	460	}
73516e12	461
21440d19 SL	462	if (flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE)
	463	print_bool(PRINT_ANY,
	464	"ip6_tnl_f_allow_local_remote",
	465	"allow-localremote ",
	466	true);
	467
73516e12	468	if (tb[IFLA_IPTUN_ENCAP_TYPE] &&
1facc1c6	469	rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) {
73516e12 TH	470	__u16 type = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE]);
	471	__u16 flags = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_FLAGS]);
	472	__u16 sport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_SPORT]);
	473	__u16 dport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_DPORT]);
	474
1facc1c6 JF	475	open_json_object("encap");
1facc1c6 JF	476	print_string(PRINT_FP, NULL, "encap ", NULL);
73516e12 TH	477	switch (type) {
73516e12 TH	478	case TUNNEL_ENCAP_FOU:
1facc1c6	479	print_string(PRINT_ANY, "type", "%s ", "fou");
73516e12 TH	480	break;
73516e12 TH	481	case TUNNEL_ENCAP_GUE:
1facc1c6	482	print_string(PRINT_ANY, "type", "%s ", "gue");
73516e12 TH	483	break;
73516e12 TH	484	default:
1facc1c6	485	print_null(PRINT_ANY, "type", "unknown ", NULL);
73516e12 TH	486	break;
	487	}
	488
1facc1c6 JF	489	if (is_json_context()) {
	490	print_uint(PRINT_JSON,
	491	"sport",
	492	NULL,
	493	sport ? ntohs(sport) : 0);
	494	print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
	495	print_bool(PRINT_JSON, "csum", NULL,
	496	flags & TUNNEL_ENCAP_FLAG_CSUM);
	497	print_bool(PRINT_JSON, "csum6", NULL,
	498	flags & TUNNEL_ENCAP_FLAG_CSUM6);
	499	print_bool(PRINT_JSON, "remcsum", NULL,
	500	flags & TUNNEL_ENCAP_FLAG_REMCSUM);
	501	close_json_object();
	502	} else {
	503	if (sport == 0)
	504	fputs("encap-sport auto ", f);
	505	else
	506	fprintf(f, "encap-sport %u", ntohs(sport));
73516e12	507
1facc1c6	508	fprintf(f, "encap-dport %u ", ntohs(dport));
73516e12	509
1facc1c6 JF	510	if (flags & TUNNEL_ENCAP_FLAG_CSUM)
	511	fputs("encap-csum ", f);
	512	else
	513	fputs("noencap-csum ", f);
73516e12	514
1facc1c6 JF	515	if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
	516	fputs("encap-csum6 ", f);
	517	else
	518	fputs("noencap-csum6 ", f);
73516e12	519
1facc1c6 JF	520	if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
	521	fputs("encap-remcsum ", f);
	522	else
	523	fputs("noencap-remcsum ", f);
	524	}
73516e12	525	}
9d0efc10 ND	526	}
9d0efc10 ND	527
561e650e	528	static void ip6tunnel_print_help(struct link_util lu, int argc, char *argv,
1facc1c6	529	FILE *f)
561e650e	530	{
	531	print_usage(f);
	532	}
	533
9d0efc10 ND	534	struct link_util ip6tnl_link_util = {
	535	.id = "ip6tnl",
	536	.maxattr = IFLA_IPTUN_MAX,
	537	.parse_opt = ip6tunnel_parse_opt,
	538	.print_opt = ip6tunnel_print_opt,
561e650e	539	.print_help = ip6tunnel_print_help,
9d0efc10	540	};