[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 = 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, "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_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 (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	};
86bf43c7	86	struct nlmsghdr *answer = NULL;
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;
d17b136f PS	91	struct in6_addr laddr = {};
d17b136f PS	92	struct in6_addr raddr = {};
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");
86bf43c7	111	free(answer);
9d0efc10 ND	112	return -1;
	113	}
	114
86bf43c7	115	len = answer->nlmsg_len;
9d0efc10 ND	116	len -= NLMSG_LENGTH(sizeof(*ifi));
	117	if (len < 0)
	118	goto get_failed;
	119
86bf43c7	120	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
9d0efc10 ND	121
	122	if (!tb[IFLA_LINKINFO])
	123	goto get_failed;
	124
	125	parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
	126
	127	if (!linkinfo[IFLA_INFO_DATA])
	128	goto get_failed;
	129
	130	parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
	131	linkinfo[IFLA_INFO_DATA]);
	132
	133	if (iptuninfo[IFLA_IPTUN_LOCAL])
	134	memcpy(&laddr, RTA_DATA(iptuninfo[IFLA_IPTUN_LOCAL]),
	135	sizeof(laddr));
	136
	137	if (iptuninfo[IFLA_IPTUN_REMOTE])
	138	memcpy(&raddr, RTA_DATA(iptuninfo[IFLA_IPTUN_REMOTE]),
	139	sizeof(raddr));
	140
	141	if (iptuninfo[IFLA_IPTUN_TTL])
	142	hop_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
	143
	144	if (iptuninfo[IFLA_IPTUN_ENCAP_LIMIT])
	145	encap_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]);
	146
	147	if (iptuninfo[IFLA_IPTUN_FLOWINFO])
	148	flowinfo = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLOWINFO]);
	149
	150	if (iptuninfo[IFLA_IPTUN_FLAGS])
	151	flags = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLAGS]);
	152
	153	if (iptuninfo[IFLA_IPTUN_LINK])
	154	link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
	155
	156	if (iptuninfo[IFLA_IPTUN_PROTO])
	157	proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
4bfe6825 AS	158	if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA])
4bfe6825 AS	159	metadata = 1;
ad4b1425 CG	160
	161	if (iptuninfo[IFLA_IPTUN_FWMARK])
	162	fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]);
86bf43c7 HL	163
86bf43c7 HL	164	free(answer);
9d0efc10 ND	165	}
	166
	167	while (argc > 0) {
	168	if (matches(*argv, "mode") == 0) {
	169	NEXT_ARG();
	170	if (strcmp(*argv, "ipv6/ipv6") == 0 \|\|
	171	strcmp(*argv, "ip6ip6") == 0)
	172	proto = IPPROTO_IPV6;
	173	else if (strcmp(*argv, "ip/ipv6") == 0 \|\|
	174	strcmp(*argv, "ipv4/ipv6") == 0 \|\|
	175	strcmp(*argv, "ipip6") == 0 \|\|
	176	strcmp(*argv, "ip4ip6") == 0)
	177	proto = IPPROTO_IPIP;
	178	else if (strcmp(*argv, "any/ipv6") == 0 \|\|
	179	strcmp(*argv, "any") == 0)
	180	proto = 0;
	181	else
	182	invarg("Cannot guess tunnel mode.", *argv);
	183	} else if (strcmp(*argv, "remote") == 0) {
	184	inet_prefix addr;
56f5daac	185
9d0efc10 ND	186	NEXT_ARG();
	187	get_prefix(&addr, *argv, preferred_family);
	188	if (addr.family == AF_UNSPEC)
	189	invarg("\"remote\" address family is AF_UNSPEC", *argv);
	190	memcpy(&raddr, addr.data, addr.bytelen);
	191	} else if (strcmp(*argv, "local") == 0) {
	192	inet_prefix addr;
56f5daac	193
9d0efc10 ND	194	NEXT_ARG();
	195	get_prefix(&addr, *argv, preferred_family);
	196	if (addr.family == AF_UNSPEC)
	197	invarg("\"local\" address family is AF_UNSPEC", *argv);
	198	memcpy(&laddr, addr.data, addr.bytelen);
	199	} else if (matches(*argv, "dev") == 0) {
	200	NEXT_ARG();
	201	link = if_nametoindex(*argv);
	202	if (link == 0)
	203	invarg("\"dev\" is invalid", *argv);
	204	} else if (strcmp(*argv, "hoplimit") == 0 \|\|
	205	strcmp(*argv, "ttl") == 0 \|\|
	206	strcmp(*argv, "hlim") == 0) {
	207	__u8 uval;
56f5daac	208
9d0efc10 ND	209	NEXT_ARG();
	210	if (get_u8(&uval, *argv, 0))
	211	invarg("invalid HLIM", *argv);
	212	hop_limit = uval;
73516e12	213	} else if (strcmp(*argv, "encaplimit") == 0) {
9d0efc10 ND	214	NEXT_ARG();
	215	if (strcmp(*argv, "none") == 0) {
	216	flags \|= IP6_TNL_F_IGN_ENCAP_LIMIT;
	217	} else {
	218	__u8 uval;
56f5daac	219
9d0efc10 ND	220	if (get_u8(&uval, *argv, 0) < -1)
	221	invarg("invalid ELIM", *argv);
	222	encap_limit = uval;
	223	flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
	224	}
	225	} else if (strcmp(*argv, "tclass") == 0 \|\|
	226	strcmp(*argv, "tc") == 0 \|\|
	227	strcmp(*argv, "tos") == 0 \|\|
	228	matches(*argv, "dsfield") == 0) {
	229	__u8 uval;
56f5daac	230
9d0efc10 ND	231	NEXT_ARG();
	232	flowinfo &= ~IP6_FLOWINFO_TCLASS;
	233	if (strcmp(*argv, "inherit") == 0)
	234	flags \|= IP6_TNL_F_USE_ORIG_TCLASS;
	235	else {
	236	if (get_u8(&uval, *argv, 16))
	237	invarg("invalid TClass", *argv);
	238	flowinfo \|= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
	239	flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
	240	}
	241	} else if (strcmp(*argv, "flowlabel") == 0 \|\|
	242	strcmp(*argv, "fl") == 0) {
	243	__u32 uval;
56f5daac	244
9d0efc10 ND	245	NEXT_ARG();
	246	flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
	247	if (strcmp(*argv, "inherit") == 0)
	248	flags \|= IP6_TNL_F_USE_ORIG_FLOWLABEL;
	249	else {
	250	if (get_u32(&uval, *argv, 16))
	251	invarg("invalid Flowlabel", *argv);
	252	if (uval > 0xFFFFF)
	253	invarg("invalid Flowlabel", *argv);
	254	flowinfo \|= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
	255	flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
	256	}
	257	} else if (strcmp(*argv, "dscp") == 0) {
	258	NEXT_ARG();
	259	if (strcmp(*argv, "inherit") != 0)
	260	invarg("not inherit", *argv);
	261	flags \|= IP6_TNL_F_RCV_DSCP_COPY;
	262	} else if (strcmp(*argv, "fwmark") == 0) {
	263	NEXT_ARG();
ad4b1425 CG	264	if (strcmp(*argv, "inherit") == 0) {
	265	flags \|= IP6_TNL_F_USE_ORIG_FWMARK;
	266	fwmark = 0;
	267	} else {
	268	if (get_u32(&fwmark, *argv, 0))
	269	invarg("invalid fwmark\n", *argv);
	270	flags &= ~IP6_TNL_F_USE_ORIG_FWMARK;
	271	}
21440d19 SL	272	} else if (strcmp(*argv, "allow-localremote") == 0) {
	273	flags \|= IP6_TNL_F_ALLOW_LOCAL_REMOTE;
	274	} else if (strcmp(*argv, "noallow-localremote") == 0) {
	275	flags &= ~IP6_TNL_F_ALLOW_LOCAL_REMOTE;
73516e12 TH	276	} else if (strcmp(*argv, "noencap") == 0) {
	277	encaptype = TUNNEL_ENCAP_NONE;
	278	} else if (strcmp(*argv, "encap") == 0) {
	279	NEXT_ARG();
	280	if (strcmp(*argv, "fou") == 0)
	281	encaptype = TUNNEL_ENCAP_FOU;
	282	else if (strcmp(*argv, "gue") == 0)
	283	encaptype = TUNNEL_ENCAP_GUE;
	284	else if (strcmp(*argv, "none") == 0)
	285	encaptype = TUNNEL_ENCAP_NONE;
	286	else
	287	invarg("Invalid encap type.", *argv);
	288	} else if (strcmp(*argv, "encap-sport") == 0) {
	289	NEXT_ARG();
	290	if (strcmp(*argv, "auto") == 0)
	291	encapsport = 0;
	292	else if (get_u16(&encapsport, *argv, 0))
	293	invarg("Invalid source port.", *argv);
	294	} else if (strcmp(*argv, "encap-dport") == 0) {
	295	NEXT_ARG();
	296	if (get_u16(&encapdport, *argv, 0))
	297	invarg("Invalid destination port.", *argv);
	298	} else if (strcmp(*argv, "encap-csum") == 0) {
	299	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM;
	300	} else if (strcmp(*argv, "noencap-csum") == 0) {
	301	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
	302	} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
	303	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM6;
	304	} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
	305	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
	306	} else if (strcmp(*argv, "encap-remcsum") == 0) {
	307	encapflags \|= TUNNEL_ENCAP_FLAG_REMCSUM;
	308	} else if (strcmp(*argv, "noencap-remcsum") == 0) {
	309	encapflags \|= ~TUNNEL_ENCAP_FLAG_REMCSUM;
4bfe6825 AS	310	} else if (strcmp(*argv, "external") == 0) {
4bfe6825 AS	311	metadata = 1;
9d0efc10 ND	312	} else
	313	usage();
	314	argc--, argv++;
	315	}
	316
	317	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
4bfe6825 AS	318	if (metadata) {
	319	addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
	320	return 0;
	321	}
9d0efc10 ND	322	addattr_l(n, 1024, IFLA_IPTUN_LOCAL, &laddr, sizeof(laddr));
	323	addattr_l(n, 1024, IFLA_IPTUN_REMOTE, &raddr, sizeof(raddr));
	324	addattr8(n, 1024, IFLA_IPTUN_TTL, hop_limit);
	325	addattr8(n, 1024, IFLA_IPTUN_ENCAP_LIMIT, encap_limit);
	326	addattr32(n, 1024, IFLA_IPTUN_FLOWINFO, flowinfo);
	327	addattr32(n, 1024, IFLA_IPTUN_FLAGS, flags);
	328	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
ad4b1425	329	addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);
9d0efc10	330
73516e12 TH	331	addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
	332	addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
	333	addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
	334	addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));
	335
9d0efc10 ND	336	return 0;
	337	}
	338
	339	static void ip6tunnel_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	340	{
9d0efc10 ND	341	char s2[64];
	342	int flags = 0;
	343	__u32 flowinfo = 0;
	344
	345	if (!tb)
	346	return;
	347
	348	if (tb[IFLA_IPTUN_FLAGS])
	349	flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]);
	350
	351	if (tb[IFLA_IPTUN_FLOWINFO])
	352	flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]);
	353
	354	if (tb[IFLA_IPTUN_PROTO]) {
	355	switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
	356	case IPPROTO_IPIP:
1facc1c6	357	print_string(PRINT_ANY, "proto", "%s ", "ipip6");
9d0efc10 ND	358	break;
9d0efc10 ND	359	case IPPROTO_IPV6:
1facc1c6	360	print_string(PRINT_ANY, "proto", "%s ", "ip6ip6");
9d0efc10 ND	361	break;
9d0efc10 ND	362	case 0:
1facc1c6	363	print_string(PRINT_ANY, "proto", "%s ", "any");
9d0efc10 ND	364	break;
	365	}
	366	}
	367
	368	if (tb[IFLA_IPTUN_REMOTE]) {
1facc1c6 JF	369	print_string(PRINT_ANY,
	370	"remote",
	371	"remote %s ",
	372	rt_addr_n2a_rta(AF_INET6, tb[IFLA_IPTUN_REMOTE]));
9d0efc10 ND	373	}
	374
	375	if (tb[IFLA_IPTUN_LOCAL]) {
1facc1c6 JF	376	print_string(PRINT_ANY,
	377	"local",
	378	"local %s ",
	379	rt_addr_n2a_rta(AF_INET6, tb[IFLA_IPTUN_LOCAL]));
9d0efc10 ND	380	}
	381
	382	if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) {
56f5daac	383	unsigned int link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
9d0efc10 ND	384	const char *n = if_indextoname(link, s2);
	385
	386	if (n)
1facc1c6	387	print_string(PRINT_ANY, "link", "dev %s ", n);
9d0efc10	388	else
1facc1c6	389	print_uint(PRINT_ANY, "link_index", "dev %u ", link);
9d0efc10 ND	390	}
	391
	392	if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
1facc1c6 JF	393	print_bool(PRINT_ANY,
	394	"ip6_tnl_f_ign_encap_limit",
	395	"encaplimit none ",
	396	true);
9d0efc10	397	else if (tb[IFLA_IPTUN_ENCAP_LIMIT])
1facc1c6 JF	398	print_uint(PRINT_ANY,
	399	"encap_limit",
	400	"encaplimit %u ",
	401	rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT]));
9d0efc10 ND	402
9d0efc10 ND	403	if (tb[IFLA_IPTUN_TTL])
1facc1c6 JF	404	print_uint(PRINT_ANY,
	405	"ttl",
	406	"hoplimit %u ",
	407	rta_getattr_u8(tb[IFLA_IPTUN_TTL]));
9d0efc10 ND	408
9d0efc10 ND	409	if (flags & IP6_TNL_F_USE_ORIG_TCLASS)
1facc1c6 JF	410	print_bool(PRINT_ANY,
	411	"ip6_tnl_f_use_orig_tclass",
	412	"tclass inherit ",
	413	true);
9d0efc10 ND	414	else if (tb[IFLA_IPTUN_FLOWINFO]) {
	415	__u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS);
	416
1facc1c6 JF	417	if (is_json_context()) {
	418	SPRINT_BUF(b1);
	419
	420	snprintf(b1, sizeof(b1), "0x%02x", (__u8)(val >> 20));
	421	print_string(PRINT_JSON, "flowinfo_tclass", NULL, b1);
	422	} else {
	423	printf("tclass 0x%02x ", (__u8)(val >> 20));
	424	}
	425	}
	426
	427	if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) {
	428	print_bool(PRINT_ANY,
	429	"ip6_tnl_f_use_orig_flowlabel",
	430	"flowlabel inherit ",
	431	true);
	432	} else {
	433	if (is_json_context()) {
	434	SPRINT_BUF(b1);
	435
	436	snprintf(b1, sizeof(b1), "0x%05x",
	437	ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
	438	print_string(PRINT_JSON, "flowlabel", NULL, b1);
	439	} else {
	440	printf("flowlabel 0x%05x ",
	441	ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL));
	442	}
9d0efc10 ND	443	}
9d0efc10 ND	444
1facc1c6 JF	445	if (is_json_context()) {
1facc1c6 JF	446	SPRINT_BUF(flwinfo);
9d0efc10	447
1facc1c6 JF	448	snprintf(flwinfo, sizeof(flwinfo), "0x%08x", ntohl(flowinfo));
	449	print_string(PRINT_JSON, "flowinfo", NULL, flwinfo);
	450	} else {
	451	printf("(flowinfo 0x%08x) ", ntohl(flowinfo));
	452
	453	}
9d0efc10 ND	454
9d0efc10 ND	455	if (flags & IP6_TNL_F_RCV_DSCP_COPY)
1facc1c6 JF	456	print_bool(PRINT_ANY,
	457	"ip6_tnl_f_rcv_dscp_copy",
	458	"dscp inherit ",
	459	true);
9d0efc10 ND	460
9d0efc10 ND	461	if (flags & IP6_TNL_F_MIP6_DEV)
1facc1c6 JF	462	print_bool(PRINT_ANY, "ip6_tnl_f_mip6_dev", "mip6 ", true);
	463
	464	if (flags & IP6_TNL_F_USE_ORIG_FWMARK) {
	465	print_bool(PRINT_ANY,
	466	"ip6_tnl_f_use_orig_fwmark",
	467	"fwmark inherit ",
	468	true);
	469	} else if (tb[IFLA_IPTUN_FWMARK]) {
	470	__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
9d0efc10	471
1facc1c6 JF	472	if (fwmark) {
	473	SPRINT_BUF(b1);
	474
	475	snprintf(b1, sizeof(b1), "0x%x", fwmark);
	476	print_string(PRINT_ANY, "fwmark", "fwmark %s ", b1);
	477	}
	478	}
73516e12	479
21440d19 SL	480	if (flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE)
	481	print_bool(PRINT_ANY,
	482	"ip6_tnl_f_allow_local_remote",
	483	"allow-localremote ",
	484	true);
	485
73516e12	486	if (tb[IFLA_IPTUN_ENCAP_TYPE] &&
1facc1c6	487	rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) {
73516e12 TH	488	__u16 type = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE]);
	489	__u16 flags = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_FLAGS]);
	490	__u16 sport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_SPORT]);
	491	__u16 dport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_DPORT]);
	492
1facc1c6 JF	493	open_json_object("encap");
1facc1c6 JF	494	print_string(PRINT_FP, NULL, "encap ", NULL);
73516e12 TH	495	switch (type) {
73516e12 TH	496	case TUNNEL_ENCAP_FOU:
1facc1c6	497	print_string(PRINT_ANY, "type", "%s ", "fou");
73516e12 TH	498	break;
73516e12 TH	499	case TUNNEL_ENCAP_GUE:
1facc1c6	500	print_string(PRINT_ANY, "type", "%s ", "gue");
73516e12 TH	501	break;
73516e12 TH	502	default:
1facc1c6	503	print_null(PRINT_ANY, "type", "unknown ", NULL);
73516e12 TH	504	break;
	505	}
	506
1facc1c6 JF	507	if (is_json_context()) {
	508	print_uint(PRINT_JSON,
	509	"sport",
	510	NULL,
	511	sport ? ntohs(sport) : 0);
	512	print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
	513	print_bool(PRINT_JSON, "csum", NULL,
	514	flags & TUNNEL_ENCAP_FLAG_CSUM);
	515	print_bool(PRINT_JSON, "csum6", NULL,
	516	flags & TUNNEL_ENCAP_FLAG_CSUM6);
	517	print_bool(PRINT_JSON, "remcsum", NULL,
	518	flags & TUNNEL_ENCAP_FLAG_REMCSUM);
	519	close_json_object();
	520	} else {
	521	if (sport == 0)
	522	fputs("encap-sport auto ", f);
	523	else
	524	fprintf(f, "encap-sport %u", ntohs(sport));
73516e12	525
1facc1c6	526	fprintf(f, "encap-dport %u ", ntohs(dport));
73516e12	527
1facc1c6 JF	528	if (flags & TUNNEL_ENCAP_FLAG_CSUM)
	529	fputs("encap-csum ", f);
	530	else
	531	fputs("noencap-csum ", f);
73516e12	532
1facc1c6 JF	533	if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
	534	fputs("encap-csum6 ", f);
	535	else
	536	fputs("noencap-csum6 ", f);
73516e12	537
1facc1c6 JF	538	if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
	539	fputs("encap-remcsum ", f);
	540	else
	541	fputs("noencap-remcsum ", f);
	542	}
73516e12	543	}
9d0efc10 ND	544	}
9d0efc10 ND	545
561e650e	546	static void ip6tunnel_print_help(struct link_util lu, int argc, char *argv,
1facc1c6	547	FILE *f)
561e650e	548	{
	549	print_usage(f);
	550	}
	551
9d0efc10 ND	552	struct link_util ip6tnl_link_util = {
	553	.id = "ip6tnl",
	554	.maxattr = IFLA_IPTUN_MAX,
	555	.parse_opt = ip6tunnel_parse_opt,
	556	.print_opt = ip6tunnel_print_opt,
561e650e	557	.print_help = ip6tunnel_print_help,
9d0efc10	558	};