[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"
		"                  [ 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 = NULL;
	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 = {};
	struct in6_addr raddr = {};
	__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");
			free(answer);
			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_prefix(&addr, *argv, preferred_family);
			if (addr.family == AF_UNSPEC)
				invarg("\"remote\" address family is AF_UNSPEC", *argv);
			memcpy(&raddr, addr.data, addr.bytelen);
		} else if (strcmp(*argv, "local") == 0) {
			inet_prefix addr;

			NEXT_ARG();
			get_prefix(&addr, *argv, preferred_family);
			if (addr.family == AF_UNSPEC)
				invarg("\"local\" address family is AF_UNSPEC", *argv);
			memcpy(&laddr, addr.data, addr.bytelen);
		} 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, "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_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);

		if (is_json_context()) {
			SPRINT_BUF(b1);

			snprintf(b1, sizeof(b1), "0x%02x", (__u8)(val >> 20));
			print_string(PRINT_JSON, "flowinfo_tclass", NULL, b1);
		} else {
			printf("tclass 0x%02x ", (__u8)(val >> 20));
		}
	}

	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 (is_json_context()) {
		SPRINT_BUF(flwinfo);

		snprintf(flwinfo, sizeof(flwinfo), "0x%08x", ntohl(flowinfo));
		print_string(PRINT_JSON, "flowinfo", NULL, flwinfo);
	} else {
		printf("(flowinfo 0x%08x) ", ntohl(flowinfo));

	}

	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 (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"
8b471354 PS	45	" [ noencap ]\n"
	46	" [ encap { fou \| gue \| none } ]\n"
	47	" [ encap-sport PORT ]\n"
	48	" [ encap-dport PORT ]\n"
	49	" [ [no]encap-csum ]\n"
	50	" [ [no]encap-csum6 ]\n"
	51	" [ [no]encap-remcsum ]\n"
	52	" [ external ]\n"
	53	"\n"
	54	"Where: ADDR := IPV6_ADDRESS\n"
	55	" ELIM := { none \| 0..255 }(default=%d)\n"
	56	" HLIM := 0..255 (default=%d)\n"
	57	" TCLASS := { 0x0..0xff \| inherit }\n"
ad4b1425 CG	58	" FLOWLABEL := { 0x0..0xfffff \| inherit }\n"
ad4b1425 CG	59	" MARK := { 0x0..0xffffffff \| inherit }\n",
8b471354 PS	60	IPV6_DEFAULT_TNL_ENCAP_LIMIT, DEFAULT_TNL_HOP_LIMIT
8b471354 PS	61	);
561e650e	62	}
	63
	64	static void usage(void) __attribute__((noreturn));
	65	static void usage(void)
	66	{
	67	print_usage(stderr);
9d0efc10 ND	68	exit(-1);
	69	}
	70
	71	static int ip6tunnel_parse_opt(struct link_util lu, int argc, char *argv,
	72	struct nlmsghdr *n)
	73	{
d17b136f	74	struct ifinfomsg ifi = (struct ifinfomsg )(n + 1);
9d0efc10 ND	75	struct {
	76	struct nlmsghdr n;
	77	struct ifinfomsg i;
d17b136f PS	78	} req = {
	79	.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
	80	.n.nlmsg_flags = NLM_F_REQUEST,
	81	.n.nlmsg_type = RTM_GETLINK,
	82	.i.ifi_family = preferred_family,
	83	.i.ifi_index = ifi->ifi_index,
	84	};
86bf43c7	85	struct nlmsghdr *answer = NULL;
9d0efc10 ND	86	struct rtattr *tb[IFLA_MAX + 1];
	87	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
	88	struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
	89	int len;
d17b136f PS	90	struct in6_addr laddr = {};
d17b136f PS	91	struct in6_addr raddr = {};
9d0efc10 ND	92	__u8 hop_limit = DEFAULT_TNL_HOP_LIMIT;
	93	__u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
	94	__u32 flowinfo = 0;
	95	__u32 flags = 0;
	96	__u32 link = 0;
	97	__u8 proto = 0;
73516e12 TH	98	__u16 encaptype = 0;
	99	__u16 encapflags = TUNNEL_ENCAP_FLAG_CSUM6;
	100	__u16 encapsport = 0;
	101	__u16 encapdport = 0;
4bfe6825	102	__u8 metadata = 0;
ad4b1425	103	__u32 fwmark = 0;
9d0efc10	104
9d0efc10	105	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
86bf43c7	106	if (rtnl_talk(&rth, &req.n, &answer) < 0) {
9d0efc10 ND	107	get_failed:
	108	fprintf(stderr,
	109	"Failed to get existing tunnel info.\n");
86bf43c7	110	free(answer);
9d0efc10 ND	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 ND	185	NEXT_ARG();
	186	get_prefix(&addr, *argv, preferred_family);
	187	if (addr.family == AF_UNSPEC)
	188	invarg("\"remote\" address family is AF_UNSPEC", *argv);
	189	memcpy(&raddr, addr.data, addr.bytelen);
	190	} else if (strcmp(*argv, "local") == 0) {
	191	inet_prefix addr;
56f5daac	192
9d0efc10 ND	193	NEXT_ARG();
	194	get_prefix(&addr, *argv, preferred_family);
	195	if (addr.family == AF_UNSPEC)
	196	invarg("\"local\" address family is AF_UNSPEC", *argv);
	197	memcpy(&laddr, addr.data, addr.bytelen);
	198	} else if (matches(*argv, "dev") == 0) {
	199	NEXT_ARG();
	200	link = if_nametoindex(*argv);
	201	if (link == 0)
	202	invarg("\"dev\" is invalid", *argv);
	203	} else if (strcmp(*argv, "hoplimit") == 0 \|\|
	204	strcmp(*argv, "ttl") == 0 \|\|
	205	strcmp(*argv, "hlim") == 0) {
	206	__u8 uval;
56f5daac	207
9d0efc10 ND	208	NEXT_ARG();
	209	if (get_u8(&uval, *argv, 0))
	210	invarg("invalid HLIM", *argv);
	211	hop_limit = uval;
73516e12	212	} else if (strcmp(*argv, "encaplimit") == 0) {
9d0efc10 ND	213	NEXT_ARG();
	214	if (strcmp(*argv, "none") == 0) {
	215	flags \|= IP6_TNL_F_IGN_ENCAP_LIMIT;
	216	} else {
	217	__u8 uval;
56f5daac	218
9d0efc10 ND	219	if (get_u8(&uval, *argv, 0) < -1)
	220	invarg("invalid ELIM", *argv);
	221	encap_limit = uval;
	222	flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
	223	}
	224	} else if (strcmp(*argv, "tclass") == 0 \|\|
	225	strcmp(*argv, "tc") == 0 \|\|
	226	strcmp(*argv, "tos") == 0 \|\|
	227	matches(*argv, "dsfield") == 0) {
	228	__u8 uval;
56f5daac	229
9d0efc10 ND	230	NEXT_ARG();
	231	flowinfo &= ~IP6_FLOWINFO_TCLASS;
	232	if (strcmp(*argv, "inherit") == 0)
	233	flags \|= IP6_TNL_F_USE_ORIG_TCLASS;
	234	else {
	235	if (get_u8(&uval, *argv, 16))
	236	invarg("invalid TClass", *argv);
	237	flowinfo \|= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
	238	flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
	239	}
	240	} else if (strcmp(*argv, "flowlabel") == 0 \|\|
	241	strcmp(*argv, "fl") == 0) {
	242	__u32 uval;
56f5daac	243
9d0efc10 ND	244	NEXT_ARG();
	245	flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
	246	if (strcmp(*argv, "inherit") == 0)
	247	flags \|= IP6_TNL_F_USE_ORIG_FLOWLABEL;
	248	else {
	249	if (get_u32(&uval, *argv, 16))
	250	invarg("invalid Flowlabel", *argv);
	251	if (uval > 0xFFFFF)
	252	invarg("invalid Flowlabel", *argv);
	253	flowinfo \|= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
	254	flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
	255	}
	256	} else if (strcmp(*argv, "dscp") == 0) {
	257	NEXT_ARG();
	258	if (strcmp(*argv, "inherit") != 0)
	259	invarg("not inherit", *argv);
	260	flags \|= IP6_TNL_F_RCV_DSCP_COPY;
	261	} else if (strcmp(*argv, "fwmark") == 0) {
	262	NEXT_ARG();
ad4b1425 CG	263	if (strcmp(*argv, "inherit") == 0) {
	264	flags \|= IP6_TNL_F_USE_ORIG_FWMARK;
	265	fwmark = 0;
	266	} else {
	267	if (get_u32(&fwmark, *argv, 0))
	268	invarg("invalid fwmark\n", *argv);
	269	flags &= ~IP6_TNL_F_USE_ORIG_FWMARK;
	270	}
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) {
	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
	343	if (tb[IFLA_IPTUN_FLAGS])
	344	flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]);
	345
	346	if (tb[IFLA_IPTUN_FLOWINFO])
	347	flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]);
	348
	349	if (tb[IFLA_IPTUN_PROTO]) {
	350	switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
	351	case IPPROTO_IPIP:
1facc1c6	352	print_string(PRINT_ANY, "proto", "%s ", "ipip6");
9d0efc10 ND	353	break;
9d0efc10 ND	354	case IPPROTO_IPV6:
1facc1c6	355	print_string(PRINT_ANY, "proto", "%s ", "ip6ip6");
9d0efc10 ND	356	break;
9d0efc10 ND	357	case 0:
1facc1c6	358	print_string(PRINT_ANY, "proto", "%s ", "any");
9d0efc10 ND	359	break;
	360	}
	361	}
	362
	363	if (tb[IFLA_IPTUN_REMOTE]) {
1facc1c6 JF	364	print_string(PRINT_ANY,
	365	"remote",
	366	"remote %s ",
	367	rt_addr_n2a_rta(AF_INET6, tb[IFLA_IPTUN_REMOTE]));
9d0efc10 ND	368	}
	369
	370	if (tb[IFLA_IPTUN_LOCAL]) {
1facc1c6 JF	371	print_string(PRINT_ANY,
	372	"local",
	373	"local %s ",
	374	rt_addr_n2a_rta(AF_INET6, tb[IFLA_IPTUN_LOCAL]));
9d0efc10 ND	375	}
	376
	377	if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) {
56f5daac	378	unsigned int link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
9d0efc10 ND	379	const char *n = if_indextoname(link, s2);
	380
	381	if (n)
1facc1c6	382	print_string(PRINT_ANY, "link", "dev %s ", n);
9d0efc10	383	else
1facc1c6	384	print_uint(PRINT_ANY, "link_index", "dev %u ", link);
9d0efc10 ND	385	}
	386
	387	if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
1facc1c6 JF	388	print_bool(PRINT_ANY,
	389	"ip6_tnl_f_ign_encap_limit",
	390	"encaplimit none ",
	391	true);
9d0efc10	392	else if (tb[IFLA_IPTUN_ENCAP_LIMIT])
1facc1c6 JF	393	print_uint(PRINT_ANY,
	394	"encap_limit",
	395	"encaplimit %u ",
	396	rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]));
9d0efc10 ND	397
9d0efc10 ND	398	if (tb[IFLA_IPTUN_TTL])
1facc1c6 JF	399	print_uint(PRINT_ANY,
	400	"ttl",
	401	"hoplimit %u ",
	402	rta_getattr_u8(tb[IFLA_IPTUN_TTL]));
9d0efc10 ND	403
9d0efc10 ND	404	if (flags & IP6_TNL_F_USE_ORIG_TCLASS)
1facc1c6 JF	405	print_bool(PRINT_ANY,
	406	"ip6_tnl_f_use_orig_tclass",
	407	"tclass inherit ",
	408	true);
9d0efc10 ND	409	else if (tb[IFLA_IPTUN_FLOWINFO]) {
	410	__u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS);
	411
1facc1c6 JF	412	if (is_json_context()) {
	413	SPRINT_BUF(b1);
	414
	415	snprintf(b1, sizeof(b1), "0x%02x", (__u8)(val >> 20));
	416	print_string(PRINT_JSON, "flowinfo_tclass", NULL, b1);
	417	} else {
	418	printf("tclass 0x%02x ", (__u8)(val >> 20));
	419	}
	420	}
	421
	422	if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) {
	423	print_bool(PRINT_ANY,
	424	"ip6_tnl_f_use_orig_flowlabel",
	425	"flowlabel inherit ",
	426	true);
	427	} else {
	428	if (is_json_context()) {
	429	SPRINT_BUF(b1);
	430
	431	snprintf(b1, sizeof(b1), "0x%05x",
	432	ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
	433	print_string(PRINT_JSON, "flowlabel", NULL, b1);
	434	} else {
	435	printf("flowlabel 0x%05x ",
	436	ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
	437	}
9d0efc10 ND	438	}
9d0efc10 ND	439
1facc1c6 JF	440	if (is_json_context()) {
1facc1c6 JF	441	SPRINT_BUF(flwinfo);
9d0efc10	442
1facc1c6 JF	443	snprintf(flwinfo, sizeof(flwinfo), "0x%08x", ntohl(flowinfo));
	444	print_string(PRINT_JSON, "flowinfo", NULL, flwinfo);
	445	} else {
	446	printf("(flowinfo 0x%08x) ", ntohl(flowinfo));
	447
	448	}
9d0efc10 ND	449
9d0efc10 ND	450	if (flags & IP6_TNL_F_RCV_DSCP_COPY)
1facc1c6 JF	451	print_bool(PRINT_ANY,
	452	"ip6_tnl_f_rcv_dscp_copy",
	453	"dscp inherit ",
	454	true);
9d0efc10 ND	455
9d0efc10 ND	456	if (flags & IP6_TNL_F_MIP6_DEV)
1facc1c6 JF	457	print_bool(PRINT_ANY, "ip6_tnl_f_mip6_dev", "mip6 ", true);
	458
	459	if (flags & IP6_TNL_F_USE_ORIG_FWMARK) {
	460	print_bool(PRINT_ANY,
	461	"ip6_tnl_f_use_orig_fwmark",
	462	"fwmark inherit ",
	463	true);
	464	} else if (tb[IFLA_IPTUN_FWMARK]) {
	465	__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
9d0efc10	466
1facc1c6 JF	467	if (fwmark) {
	468	SPRINT_BUF(b1);
	469
	470	snprintf(b1, sizeof(b1), "0x%x", fwmark);
	471	print_string(PRINT_ANY, "fwmark", "fwmark %s ", b1);
	472	}
	473	}
73516e12 TH	474
73516e12 TH	475	if (tb[IFLA_IPTUN_ENCAP_TYPE] &&
1facc1c6	476	rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) {
73516e12 TH	477	__u16 type = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE]);
	478	__u16 flags = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_FLAGS]);
	479	__u16 sport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_SPORT]);
	480	__u16 dport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_DPORT]);
	481
1facc1c6 JF	482	open_json_object("encap");
1facc1c6 JF	483	print_string(PRINT_FP, NULL, "encap ", NULL);
73516e12 TH	484	switch (type) {
73516e12 TH	485	case TUNNEL_ENCAP_FOU:
1facc1c6	486	print_string(PRINT_ANY, "type", "%s ", "fou");
73516e12 TH	487	break;
73516e12 TH	488	case TUNNEL_ENCAP_GUE:
1facc1c6	489	print_string(PRINT_ANY, "type", "%s ", "gue");
73516e12 TH	490	break;
73516e12 TH	491	default:
1facc1c6	492	print_null(PRINT_ANY, "type", "unknown ", NULL);
73516e12 TH	493	break;
	494	}
	495
1facc1c6 JF	496	if (is_json_context()) {
	497	print_uint(PRINT_JSON,
	498	"sport",
	499	NULL,
	500	sport ? ntohs(sport) : 0);
	501	print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
	502	print_bool(PRINT_JSON, "csum", NULL,
	503	flags & TUNNEL_ENCAP_FLAG_CSUM);
	504	print_bool(PRINT_JSON, "csum6", NULL,
	505	flags & TUNNEL_ENCAP_FLAG_CSUM6);
	506	print_bool(PRINT_JSON, "remcsum", NULL,
	507	flags & TUNNEL_ENCAP_FLAG_REMCSUM);
	508	close_json_object();
	509	} else {
	510	if (sport == 0)
	511	fputs("encap-sport auto ", f);
	512	else
	513	fprintf(f, "encap-sport %u", ntohs(sport));
73516e12	514
1facc1c6	515	fprintf(f, "encap-dport %u ", ntohs(dport));
73516e12	516
1facc1c6 JF	517	if (flags & TUNNEL_ENCAP_FLAG_CSUM)
	518	fputs("encap-csum ", f);
	519	else
	520	fputs("noencap-csum ", f);
73516e12	521
1facc1c6 JF	522	if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
	523	fputs("encap-csum6 ", f);
	524	else
	525	fputs("noencap-csum6 ", f);
73516e12	526
1facc1c6 JF	527	if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
	528	fputs("encap-remcsum ", f);
	529	else
	530	fputs("noencap-remcsum ", f);
	531	}
73516e12	532	}
9d0efc10 ND	533	}
9d0efc10 ND	534
561e650e	535	static void ip6tunnel_print_help(struct link_util lu, int argc, char *argv,
1facc1c6	536	FILE *f)
561e650e	537	{
	538	print_usage(f);
	539	}
	540
9d0efc10 ND	541	struct link_util ip6tnl_link_util = {
	542	.id = "ip6tnl",
	543	.maxattr = IFLA_IPTUN_MAX,
	544	.parse_opt = ip6tunnel_parse_opt,
	545	.print_opt = ip6tunnel_print_opt,
561e650e	546	.print_help = ip6tunnel_print_help,
9d0efc10	547	};