[mirror_iproute2.git] / ip / link_iptnl.c

/*
 * link_iptnl.c	ipip and sit 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/in.h>
#include <linux/ip.h>
#include <linux/if_tunnel.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#include "tunnel.h"

static void print_usage(FILE *f, int sit)
{
	const char *type = sit ? "sit " : "ipip";

	fprintf(f,
		"Usage: ... %s [ remote ADDR ]\n"
		"                [ local ADDR ]\n"
		"                [ ttl TTL ]\n"
		"                [ tos TOS ]\n"
		"                [ [no]pmtudisc ]\n"
		"                [ dev PHYS_DEV ]\n"
		"                [ 6rd-prefix ADDR ]\n"
		"                [ 6rd-relay_prefix ADDR ]\n"
		"                [ 6rd-reset ]\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",
		type
	);
	if (sit) {
		fprintf(f, "          [ mode { ip6ip | ipip | mplsip | any } ]\n");
		fprintf(f, "          [ isatap ]\n");
	} else {
		fprintf(f, "          [ mode { ipip | mplsip | any } ]\n");
	}
	fprintf(f, "                [ external ]\n");
	fprintf(f, "                [ fwmark MARK ]\n");
	fprintf(f, "\n");
	fprintf(f, "Where: ADDR := { IP_ADDRESS | any }\n");
	fprintf(f, "       TOS  := { NUMBER | inherit }\n");
	fprintf(f, "       TTL  := { 1..255 | inherit }\n");
	fprintf(f, "       MARK := { 0x0..0xffffffff }\n");
}

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

static int iptunnel_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;
	__u32 link = 0;
	__u32 laddr = 0;
	__u32 raddr = 0;
	__u8 ttl = 0;
	__u8 tos = 0;
	__u8 pmtudisc = 1;
	__u16 iflags = 0;
	__u8 proto = 0;
	struct in6_addr ip6rdprefix = {};
	__u16 ip6rdprefixlen = 0;
	__u32 ip6rdrelayprefix = 0;
	__u16 ip6rdrelayprefixlen = 0;
	__u16 encaptype = 0;
	__u16 encapflags = 0;
	__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])
			laddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LOCAL]);

		if (iptuninfo[IFLA_IPTUN_REMOTE])
			raddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_REMOTE]);

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

		if (iptuninfo[IFLA_IPTUN_TOS])
			tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]);

		if (iptuninfo[IFLA_IPTUN_PMTUDISC])
			pmtudisc =
				rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]);

		if (iptuninfo[IFLA_IPTUN_FLAGS])
			iflags = rta_getattr_u16(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_ENCAP_TYPE])
			encaptype = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_TYPE]);
		if (iptuninfo[IFLA_IPTUN_ENCAP_FLAGS])
			encapflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]);
		if (iptuninfo[IFLA_IPTUN_ENCAP_SPORT])
			encapsport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_SPORT]);
		if (iptuninfo[IFLA_IPTUN_ENCAP_DPORT])
			encapdport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_DPORT]);
		if (iptuninfo[IFLA_IPTUN_6RD_PREFIX])
			memcpy(&ip6rdprefix,
			       RTA_DATA(iptuninfo[IFLA_IPTUN_6RD_PREFIX]),
			       sizeof(laddr));

		if (iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN])
			ip6rdprefixlen =
				rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN]);

		if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX])
			ip6rdrelayprefix =
				rta_getattr_u32(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX]);

		if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN])
			ip6rdrelayprefixlen =
				rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
		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 (strcmp(*argv, "remote") == 0) {
			NEXT_ARG();
			raddr = get_addr32(*argv);
		} else if (strcmp(*argv, "local") == 0) {
			NEXT_ARG();
			laddr = get_addr32(*argv);
		} else if (matches(*argv, "dev") == 0) {
			NEXT_ARG();
			link = if_nametoindex(*argv);
			if (link == 0)
				invarg("\"dev\" is invalid", *argv);
		} else if (strcmp(*argv, "ttl") == 0 ||
			   strcmp(*argv, "hoplimit") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "inherit") != 0) {
				if (get_u8(&ttl, *argv, 0))
					invarg("invalid TTL\n", *argv);
			} else
				ttl = 0;
		} else if (strcmp(*argv, "tos") == 0 ||
			   strcmp(*argv, "tclass") == 0 ||
			   matches(*argv, "dsfield") == 0) {
			__u32 uval;

			NEXT_ARG();
			if (strcmp(*argv, "inherit") != 0) {
				if (rtnl_dsfield_a2n(&uval, *argv))
					invarg("bad TOS value", *argv);
				tos = uval;
			} else
				tos = 1;
		} else if (strcmp(*argv, "nopmtudisc") == 0) {
			pmtudisc = 0;
		} else if (strcmp(*argv, "pmtudisc") == 0) {
			pmtudisc = 1;
		} else if (strcmp(lu->id, "sit") == 0 &&
			   strcmp(*argv, "isatap") == 0) {
			iflags |= SIT_ISATAP;
		} else if (strcmp(*argv, "mode") == 0) {
			NEXT_ARG();
			if (strcmp(lu->id, "sit") == 0 &&
			    (strcmp(*argv, "ipv6/ipv4") == 0 ||
			     strcmp(*argv, "ip6ip") == 0))
				proto = IPPROTO_IPV6;
			else if (strcmp(*argv, "ipv4/ipv4") == 0 ||
				 strcmp(*argv, "ipip") == 0 ||
				 strcmp(*argv, "ip4ip4") == 0)
				proto = IPPROTO_IPIP;
			else if (strcmp(*argv, "mpls/ipv4") == 0 ||
				   strcmp(*argv, "mplsip") == 0)
				proto = IPPROTO_MPLS;
			else if (strcmp(*argv, "any/ipv4") == 0 ||
				 strcmp(*argv, "any") == 0)
				proto = 0;
			else
				invarg("Cannot guess tunnel mode.", *argv);
		} 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 if (strcmp(*argv, "6rd-prefix") == 0) {
			inet_prefix prefix;

			NEXT_ARG();
			if (get_prefix(&prefix, *argv, AF_INET6))
				invarg("invalid 6rd_prefix\n", *argv);
			memcpy(&ip6rdprefix, prefix.data, 16);
			ip6rdprefixlen = prefix.bitlen;
		} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
			inet_prefix prefix;

			NEXT_ARG();
			if (get_prefix(&prefix, *argv, AF_INET))
				invarg("invalid 6rd-relay_prefix\n", *argv);
			memcpy(&ip6rdrelayprefix, prefix.data, 4);
			ip6rdrelayprefixlen = prefix.bitlen;
		} else if (strcmp(*argv, "6rd-reset") == 0) {
			inet_prefix prefix;

			get_prefix(&prefix, "2002::", AF_INET6);
			memcpy(&ip6rdprefix, prefix.data, 16);
			ip6rdprefixlen = 16;
			ip6rdrelayprefix = 0;
			ip6rdrelayprefixlen = 0;
		} else if (strcmp(*argv, "fwmark") == 0) {
			NEXT_ARG();
			if (get_u32(&fwmark, *argv, 0))
				invarg("invalid fwmark\n", *argv);
		} else
			usage(strcmp(lu->id, "sit") == 0);
		argc--, argv++;
	}

	if (ttl && pmtudisc == 0) {
		fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
		exit(-1);
	}

	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
	if (metadata) {
		addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
		return 0;
	}

	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
	addattr32(n, 1024, IFLA_IPTUN_LOCAL, laddr);
	addattr32(n, 1024, IFLA_IPTUN_REMOTE, raddr);
	addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
	addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
	addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
	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));

	if (strcmp(lu->id, "sit") == 0) {
		addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
		if (ip6rdprefixlen) {
			addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
				  &ip6rdprefix, sizeof(ip6rdprefix));
			addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
				  ip6rdprefixlen);
			addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
				  ip6rdrelayprefix);
			addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
				  ip6rdrelayprefixlen);
		}
	}

	return 0;
}

static void iptunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
	char s1[1024];
	char s2[64];
	const char *local = "any";
	const char *remote = "any";
	__u16 prefixlen, type;
	__u8 ttl = 0;

	if (!tb)
		return;

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

	if (tb[IFLA_IPTUN_PROTO]) {
		switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
		case IPPROTO_IPIP:
			print_string(PRINT_ANY, "proto", "%s ", "ipip");
			break;
		case IPPROTO_IPV6:
			print_string(PRINT_ANY, "proto", "%s ", "ip6ip");
			break;
		case IPPROTO_MPLS:
			print_string(PRINT_ANY, "proto", "%s ", "mplsip");
			break;
		case 0:
			print_string(PRINT_ANY, "proto", "%s ", "any");
			break;
		}
	}

	if (tb[IFLA_IPTUN_REMOTE]) {
		unsigned int addr = rta_getattr_u32(tb[IFLA_IPTUN_REMOTE]);

		if (addr)
			remote = format_host(AF_INET, 4, &addr);
	}

	print_string(PRINT_ANY, "remote", "remote %s ", remote);

	if (tb[IFLA_IPTUN_LOCAL]) {
		unsigned int addr = rta_getattr_u32(tb[IFLA_IPTUN_LOCAL]);

		if (addr)
			local = format_host(AF_INET, 4, &addr);
	}

	print_string(PRINT_ANY, "local", "local %s ", local);

	if (tb[IFLA_IPTUN_LINK]) {
		unsigned int link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);

		if (link) {
			print_string(PRINT_ANY, "link", "dev %s ",
				     ll_index_to_name(link));
		}
	}

	if (tb[IFLA_IPTUN_TTL])
		ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]);
	if (is_json_context() || ttl)
		print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
	else
		print_string(PRINT_FP, NULL, "ttl %s ", "inherit");

	if (tb[IFLA_IPTUN_TOS]) {
		int tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]);

		if (tos) {
			if (is_json_context()) {
				print_0xhex(PRINT_JSON, "tos", "%#x", tos);
			} else {
				fputs("tos ", f);
				if (tos == 1)
					fputs("inherit ", f);
				else
					fprintf(f, "0x%x ", tos);
			}
		}
	}

	if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC]))
		print_bool(PRINT_ANY, "pmtudisc", "pmtudisc ", true);
	else
		print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);

	if (tb[IFLA_IPTUN_FLAGS]) {
		__u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]);

		if (iflags & SIT_ISATAP)
			print_bool(PRINT_ANY, "isatap", "isatap ", true);
	}

	if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
	    (prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]))) {
		__u16 relayprefixlen =
			rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
		__u32 relayprefix =
			rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]);

		const char *prefix = inet_ntop(AF_INET6,
					       RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
					       s1, sizeof(s1));

		if (is_json_context()) {
			print_string(PRINT_JSON, "prefix", NULL, prefix);
			print_int(PRINT_JSON, "prefixlen", NULL, prefixlen);
			if (relayprefix) {
				print_string(PRINT_JSON,
					     "relay_prefix",
					     NULL,
					     format_host(AF_INET,
							 4,
							 &relayprefix));
				print_int(PRINT_JSON,
					  "relay_prefixlen",
					  NULL,
					  relayprefixlen);
			}
		} else {
			printf("6rd-prefix %s/%u ", prefix, prefixlen);
			if (relayprefix) {
				printf("6rd-relay_prefix %s/%u ",
				       format_host(AF_INET, 4, &relayprefix),
				       relayprefixlen);
			}
		}
	}

	if (tb[IFLA_IPTUN_ENCAP_TYPE] &&
	    (type = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE])) != TUNNEL_ENCAP_NONE) {
		__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);
		}
	}

	if (tb[IFLA_IPTUN_FWMARK]) {
		__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);

		if (fwmark) {
			snprintf(s2, sizeof(s2), "0x%x", fwmark);

			print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2);
		}
	}
}

static void iptunnel_print_help(struct link_util *lu, int argc, char **argv,
	FILE *f)
{
	print_usage(f, strcmp(lu->id, "sit") == 0);
}

struct link_util ipip_link_util = {
	.id = "ipip",
	.maxattr = IFLA_IPTUN_MAX,
	.parse_opt = iptunnel_parse_opt,
	.print_opt = iptunnel_print_opt,
	.print_help = iptunnel_print_help,
};

struct link_util sit_link_util = {
	.id = "sit",
	.maxattr = IFLA_IPTUN_MAX,
	.parse_opt = iptunnel_parse_opt,
	.print_opt = iptunnel_print_opt,
	.print_help = iptunnel_print_help,
};
Commit	Line	Data
1ce2de97 ND	1	/*
	2	* link_iptnl.c ipip and sit 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
f005b700	19	#include <linux/in.h>
1ce2de97 ND	20	#include <linux/ip.h>
	21	#include <linux/if_tunnel.h>
	22	#include "rt_names.h"
	23	#include "utils.h"
	24	#include "ip_common.h"
	25	#include "tunnel.h"
	26
561e650e	27	static void print_usage(FILE *f, int sit)
1ce2de97	28	{
8b471354 PS	29	const char *type = sit ? "sit " : "ipip";
	30
	31	fprintf(f,
	32	"Usage: ... %s [ remote ADDR ]\n"
	33	" [ local ADDR ]\n"
	34	" [ ttl TTL ]\n"
	35	" [ tos TOS ]\n"
	36	" [ [no]pmtudisc ]\n"
	37	" [ dev PHYS_DEV ]\n"
	38	" [ 6rd-prefix ADDR ]\n"
	39	" [ 6rd-relay_prefix ADDR ]\n"
	40	" [ 6rd-reset ]\n"
	41	" [ noencap ]\n"
	42	" [ encap { fou \| gue \| none } ]\n"
	43	" [ encap-sport PORT ]\n"
	44	" [ encap-dport PORT ]\n"
	45	" [ [no]encap-csum ]\n"
	46	" [ [no]encap-csum6 ]\n"
	47	" [ [no]encap-remcsum ]\n",
	48	type
	49	);
77620be8	50	if (sit) {
f005b700 KJ	51	fprintf(f, " [ mode { ip6ip \| ipip \| mplsip \| any } ]\n");
f005b700 KJ	52	fprintf(f, " [ isatap ]\n");
288c28bc KJ	53	} else {
288c28bc KJ	54	fprintf(f, " [ mode { ipip \| mplsip \| any } ]\n");
77620be8	55	}
8b471354	56	fprintf(f, " [ external ]\n");
ad4b1425	57	fprintf(f, " [ fwmark MARK ]\n");
561e650e	58	fprintf(f, "\n");
8b471354	59	fprintf(f, "Where: ADDR := { IP_ADDRESS \| any }\n");
561e650e	60	fprintf(f, " TOS := { NUMBER \| inherit }\n");
561e650e	61	fprintf(f, " TTL := { 1..255 \| inherit }\n");
ad4b1425	62	fprintf(f, " MARK := { 0x0..0xffffffff }\n");
561e650e	63	}
	64
	65	static void usage(int sit) __attribute__((noreturn));
	66	static void usage(int sit)
	67	{
	68	print_usage(stderr, sit);
1ce2de97 ND	69	exit(-1);
	70	}
	71
	72	static int iptunnel_parse_opt(struct link_util lu, int argc, char *argv,
	73	struct nlmsghdr *n)
	74	{
d17b136f	75	struct ifinfomsg ifi = (struct ifinfomsg )(n + 1);
1ce2de97 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;
1ce2de97 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;
	91	__u32 link = 0;
	92	__u32 laddr = 0;
	93	__u32 raddr = 0;
	94	__u8 ttl = 0;
	95	__u8 tos = 0;
	96	__u8 pmtudisc = 1;
	97	__u16 iflags = 0;
77620be8	98	__u8 proto = 0;
d17b136f	99	struct in6_addr ip6rdprefix = {};
1ce2de97 ND	100	__u16 ip6rdprefixlen = 0;
	101	__u32 ip6rdrelayprefix = 0;
	102	__u16 ip6rdrelayprefixlen = 0;
c1159152 TH	103	__u16 encaptype = 0;
	104	__u16 encapflags = 0;
	105	__u16 encapsport = 0;
	106	__u16 encapdport = 0;
4bfe6825	107	__u8 metadata = 0;
ad4b1425	108	__u32 fwmark = 0;
1ce2de97	109
1ce2de97	110	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
86bf43c7	111	if (rtnl_talk(&rth, &req.n, &answer) < 0) {
1ce2de97 ND	112	get_failed:
	113	fprintf(stderr,
	114	"Failed to get existing tunnel info.\n");
	115	return -1;
	116	}
	117
86bf43c7	118	len = answer->nlmsg_len;
1ce2de97 ND	119	len -= NLMSG_LENGTH(sizeof(*ifi));
	120	if (len < 0)
	121	goto get_failed;
	122
86bf43c7	123	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
1ce2de97 ND	124
	125	if (!tb[IFLA_LINKINFO])
	126	goto get_failed;
	127
	128	parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
	129
	130	if (!linkinfo[IFLA_INFO_DATA])
	131	goto get_failed;
	132
	133	parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
	134	linkinfo[IFLA_INFO_DATA]);
	135
	136	if (iptuninfo[IFLA_IPTUN_LOCAL])
	137	laddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LOCAL]);
	138
	139	if (iptuninfo[IFLA_IPTUN_REMOTE])
	140	raddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_REMOTE]);
	141
	142	if (iptuninfo[IFLA_IPTUN_TTL])
	143	ttl = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
	144
	145	if (iptuninfo[IFLA_IPTUN_TOS])
	146	tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]);
	147
	148	if (iptuninfo[IFLA_IPTUN_PMTUDISC])
	149	pmtudisc =
	150	rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]);
	151
	152	if (iptuninfo[IFLA_IPTUN_FLAGS])
	153	iflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_FLAGS]);
	154
	155	if (iptuninfo[IFLA_IPTUN_LINK])
	156	link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
	157
77620be8 ND	158	if (iptuninfo[IFLA_IPTUN_PROTO])
	159	proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
	160
c1159152 TH	161	if (iptuninfo[IFLA_IPTUN_ENCAP_TYPE])
	162	encaptype = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_TYPE]);
	163	if (iptuninfo[IFLA_IPTUN_ENCAP_FLAGS])
	164	encapflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]);
	165	if (iptuninfo[IFLA_IPTUN_ENCAP_SPORT])
	166	encapsport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_SPORT]);
	167	if (iptuninfo[IFLA_IPTUN_ENCAP_DPORT])
	168	encapdport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_DPORT]);
1ce2de97 ND	169	if (iptuninfo[IFLA_IPTUN_6RD_PREFIX])
	170	memcpy(&ip6rdprefix,
	171	RTA_DATA(iptuninfo[IFLA_IPTUN_6RD_PREFIX]),
	172	sizeof(laddr));
	173
	174	if (iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN])
	175	ip6rdprefixlen =
	176	rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN]);
	177
	178	if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX])
	179	ip6rdrelayprefix =
	180	rta_getattr_u32(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX]);
	181
	182	if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN])
	183	ip6rdrelayprefixlen =
	184	rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
4bfe6825 AS	185	if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA])
4bfe6825 AS	186	metadata = 1;
ad4b1425 CG	187
	188	if (iptuninfo[IFLA_IPTUN_FWMARK])
	189	fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]);
	190
86bf43c7	191	free(answer);
1ce2de97 ND	192	}
	193
	194	while (argc > 0) {
	195	if (strcmp(*argv, "remote") == 0) {
	196	NEXT_ARG();
57daab1e	197	raddr = get_addr32(*argv);
1ce2de97 ND	198	} else if (strcmp(*argv, "local") == 0) {
1ce2de97 ND	199	NEXT_ARG();
57daab1e	200	laddr = get_addr32(*argv);
1ce2de97 ND	201	} else if (matches(*argv, "dev") == 0) {
	202	NEXT_ARG();
	203	link = if_nametoindex(*argv);
	204	if (link == 0)
	205	invarg("\"dev\" is invalid", *argv);
	206	} else if (strcmp(*argv, "ttl") == 0 \|\|
	207	strcmp(*argv, "hoplimit") == 0) {
	208	NEXT_ARG();
	209	if (strcmp(*argv, "inherit") != 0) {
	210	if (get_u8(&ttl, *argv, 0))
	211	invarg("invalid TTL\n", *argv);
	212	} else
	213	ttl = 0;
	214	} else if (strcmp(*argv, "tos") == 0 \|\|
	215	strcmp(*argv, "tclass") == 0 \|\|
	216	matches(*argv, "dsfield") == 0) {
	217	__u32 uval;
56f5daac	218
1ce2de97 ND	219	NEXT_ARG();
	220	if (strcmp(*argv, "inherit") != 0) {
	221	if (rtnl_dsfield_a2n(&uval, *argv))
	222	invarg("bad TOS value", *argv);
	223	tos = uval;
	224	} else
	225	tos = 1;
	226	} else if (strcmp(*argv, "nopmtudisc") == 0) {
	227	pmtudisc = 0;
	228	} else if (strcmp(*argv, "pmtudisc") == 0) {
	229	pmtudisc = 1;
	230	} else if (strcmp(lu->id, "sit") == 0 &&
	231	strcmp(*argv, "isatap") == 0) {
	232	iflags \|= SIT_ISATAP;
68a7f5ed	233	} else if (strcmp(*argv, "mode") == 0) {
77620be8	234	NEXT_ARG();
68a7f5ed SP	235	if (strcmp(lu->id, "sit") == 0 &&
	236	(strcmp(*argv, "ipv6/ipv4") == 0 \|\|
	237	strcmp(*argv, "ip6ip") == 0))
77620be8 ND	238	proto = IPPROTO_IPV6;
	239	else if (strcmp(*argv, "ipv4/ipv4") == 0 \|\|
	240	strcmp(*argv, "ipip") == 0 \|\|
	241	strcmp(*argv, "ip4ip4") == 0)
	242	proto = IPPROTO_IPIP;
f005b700 KJ	243	else if (strcmp(*argv, "mpls/ipv4") == 0 \|\|
	244	strcmp(*argv, "mplsip") == 0)
	245	proto = IPPROTO_MPLS;
77620be8 ND	246	else if (strcmp(*argv, "any/ipv4") == 0 \|\|
	247	strcmp(*argv, "any") == 0)
	248	proto = 0;
	249	else
	250	invarg("Cannot guess tunnel mode.", *argv);
c1159152 TH	251	} else if (strcmp(*argv, "noencap") == 0) {
	252	encaptype = TUNNEL_ENCAP_NONE;
	253	} else if (strcmp(*argv, "encap") == 0) {
	254	NEXT_ARG();
	255	if (strcmp(*argv, "fou") == 0)
	256	encaptype = TUNNEL_ENCAP_FOU;
	257	else if (strcmp(*argv, "gue") == 0)
	258	encaptype = TUNNEL_ENCAP_GUE;
	259	else if (strcmp(*argv, "none") == 0)
	260	encaptype = TUNNEL_ENCAP_NONE;
	261	else
	262	invarg("Invalid encap type.", *argv);
	263	} else if (strcmp(*argv, "encap-sport") == 0) {
	264	NEXT_ARG();
	265	if (strcmp(*argv, "auto") == 0)
	266	encapsport = 0;
	267	else if (get_u16(&encapsport, *argv, 0))
	268	invarg("Invalid source port.", *argv);
	269	} else if (strcmp(*argv, "encap-dport") == 0) {
	270	NEXT_ARG();
	271	if (get_u16(&encapdport, *argv, 0))
	272	invarg("Invalid destination port.", *argv);
	273	} else if (strcmp(*argv, "encap-csum") == 0) {
	274	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM;
	275	} else if (strcmp(*argv, "noencap-csum") == 0) {
	276	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
	277	} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
	278	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM6;
	279	} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
	280	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
858dbb20 TH	281	} else if (strcmp(*argv, "encap-remcsum") == 0) {
	282	encapflags \|= TUNNEL_ENCAP_FLAG_REMCSUM;
	283	} else if (strcmp(*argv, "noencap-remcsum") == 0) {
	284	encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
4bfe6825 AS	285	} else if (strcmp(*argv, "external") == 0) {
4bfe6825 AS	286	metadata = 1;
1ce2de97 ND	287	} else if (strcmp(*argv, "6rd-prefix") == 0) {
1ce2de97 ND	288	inet_prefix prefix;
56f5daac	289
1ce2de97 ND	290	NEXT_ARG();
	291	if (get_prefix(&prefix, *argv, AF_INET6))
	292	invarg("invalid 6rd_prefix\n", *argv);
	293	memcpy(&ip6rdprefix, prefix.data, 16);
	294	ip6rdprefixlen = prefix.bitlen;
	295	} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
	296	inet_prefix prefix;
56f5daac	297
1ce2de97 ND	298	NEXT_ARG();
	299	if (get_prefix(&prefix, *argv, AF_INET))
	300	invarg("invalid 6rd-relay_prefix\n", *argv);
	301	memcpy(&ip6rdrelayprefix, prefix.data, 4);
	302	ip6rdrelayprefixlen = prefix.bitlen;
	303	} else if (strcmp(*argv, "6rd-reset") == 0) {
	304	inet_prefix prefix;
56f5daac	305
1ce2de97 ND	306	get_prefix(&prefix, "2002::", AF_INET6);
	307	memcpy(&ip6rdprefix, prefix.data, 16);
	308	ip6rdprefixlen = 16;
	309	ip6rdrelayprefix = 0;
	310	ip6rdrelayprefixlen = 0;
ad4b1425 CG	311	} else if (strcmp(*argv, "fwmark") == 0) {
	312	NEXT_ARG();
	313	if (get_u32(&fwmark, *argv, 0))
	314	invarg("invalid fwmark\n", *argv);
1ce2de97 ND	315	} else
	316	usage(strcmp(lu->id, "sit") == 0);
	317	argc--, argv++;
	318	}
	319
	320	if (ttl && pmtudisc == 0) {
30d07e9e	321	fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
1ce2de97 ND	322	exit(-1);
	323	}
	324
68a7f5ed	325	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
4bfe6825 AS	326	if (metadata) {
	327	addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
	328	return 0;
	329	}
	330
1ce2de97 ND	331	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
	332	addattr32(n, 1024, IFLA_IPTUN_LOCAL, laddr);
	333	addattr32(n, 1024, IFLA_IPTUN_REMOTE, raddr);
	334	addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
	335	addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
	336	addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
ad4b1425	337	addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);
c1159152 TH	338
	339	addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
	340	addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
	341	addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
	342	addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));
	343
1ce2de97 ND	344	if (strcmp(lu->id, "sit") == 0) {
	345	addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
	346	if (ip6rdprefixlen) {
	347	addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
	348	&ip6rdprefix, sizeof(ip6rdprefix));
	349	addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
	350	ip6rdprefixlen);
	351	addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
	352	ip6rdrelayprefix);
	353	addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
	354	ip6rdrelayprefixlen);
	355	}
	356	}
	357
	358	return 0;
	359	}
	360
	361	static void iptunnel_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	362	{
	363	char s1[1024];
	364	char s2[64];
	365	const char *local = "any";
	366	const char *remote = "any";
9f1370c0	367	__u16 prefixlen, type;
375560c4	368	__u8 ttl = 0;
1ce2de97 ND	369
	370	if (!tb)
	371	return;
	372
7b178324 PD	373	if (tb[IFLA_IPTUN_COLLECT_METADATA])
	374	print_bool(PRINT_ANY, "external", "external ", true);
	375
d9aefbc0 SP	376	if (tb[IFLA_IPTUN_PROTO]) {
	377	switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
	378	case IPPROTO_IPIP:
	379	print_string(PRINT_ANY, "proto", "%s ", "ipip");
	380	break;
	381	case IPPROTO_IPV6:
	382	print_string(PRINT_ANY, "proto", "%s ", "ip6ip");
	383	break;
	384	case IPPROTO_MPLS:
	385	print_string(PRINT_ANY, "proto", "%s ", "mplsip");
	386	break;
	387	case 0:
	388	print_string(PRINT_ANY, "proto", "%s ", "any");
	389	break;
	390	}
	391	}
	392
1ce2de97	393	if (tb[IFLA_IPTUN_REMOTE]) {
56f5daac	394	unsigned int addr = rta_getattr_u32(tb[IFLA_IPTUN_REMOTE]);
1ce2de97 ND	395
1ce2de97 ND	396	if (addr)
a418e451	397	remote = format_host(AF_INET, 4, &addr);
1ce2de97 ND	398	}
1ce2de97 ND	399
2539a407	400	print_string(PRINT_ANY, "remote", "remote %s ", remote);
1ce2de97 ND	401
1ce2de97 ND	402	if (tb[IFLA_IPTUN_LOCAL]) {
56f5daac	403	unsigned int addr = rta_getattr_u32(tb[IFLA_IPTUN_LOCAL]);
1ce2de97 ND	404
1ce2de97 ND	405	if (addr)
a418e451	406	local = format_host(AF_INET, 4, &addr);
1ce2de97 ND	407	}
1ce2de97 ND	408
2539a407	409	print_string(PRINT_ANY, "local", "local %s ", local);
1ce2de97	410
45d3a6ef	411	if (tb[IFLA_IPTUN_LINK]) {
56f5daac	412	unsigned int link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
1ce2de97	413
45d3a6ef SP	414	if (link) {
	415	print_string(PRINT_ANY, "link", "dev %s ",
	416	ll_index_to_name(link));
	417	}
1ce2de97 ND	418	}
1ce2de97 ND	419
375560c4 SP	420	if (tb[IFLA_IPTUN_TTL])
	421	ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]);
	422	if (is_json_context() \|\| ttl)
	423	print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
	424	else
2539a407	425	print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
1ce2de97	426
2539a407	427	if (tb[IFLA_IPTUN_TOS]) {
1ce2de97 ND	428	int tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]);
1ce2de97 ND	429
2539a407 JF	430	if (tos) {
	431	if (is_json_context()) {
	432	print_0xhex(PRINT_JSON, "tos", "%#x", tos);
	433	} else {
	434	fputs("tos ", f);
	435	if (tos == 1)
	436	fputs("inherit ", f);
	437	else
	438	fprintf(f, "0x%x ", tos);
	439	}
	440	}
1ce2de97 ND	441	}
	442
	443	if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC]))
2539a407	444	print_bool(PRINT_ANY, "pmtudisc", "pmtudisc ", true);
1ce2de97	445	else
2539a407	446	print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
1ce2de97 ND	447
1ce2de97 ND	448	if (tb[IFLA_IPTUN_FLAGS]) {
195f0f62	449	__u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]);
1ce2de97	450
195f0f62	451	if (iflags & SIT_ISATAP)
2539a407	452	print_bool(PRINT_ANY, "isatap", "isatap ", true);
1ce2de97 ND	453	}
	454
	455	if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
9f1370c0	456	(prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]))) {
1ce2de97 ND	457	__u16 relayprefixlen =
	458	rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
	459	__u32 relayprefix =
	460	rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]);
	461
2539a407 JF	462	const char *prefix = inet_ntop(AF_INET6,
	463	RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
	464	s1, sizeof(s1));
	465
	466	if (is_json_context()) {
	467	print_string(PRINT_JSON, "prefix", NULL, prefix);
	468	print_int(PRINT_JSON, "prefixlen", NULL, prefixlen);
	469	if (relayprefix) {
	470	print_string(PRINT_JSON,
	471	"relay_prefix",
	472	NULL,
	473	format_host(AF_INET,
	474	4,
	475	&relayprefix));
	476	print_int(PRINT_JSON,
	477	"relay_prefixlen",
	478	NULL,
	479	relayprefixlen);
	480	}
	481	} else {
	482	printf("6rd-prefix %s/%u ", prefix, prefixlen);
	483	if (relayprefix) {
	484	printf("6rd-relay_prefix %s/%u ",
	485	format_host(AF_INET, 4, &relayprefix),
	486	relayprefixlen);
	487	}
1ce2de97 ND	488	}
1ce2de97 ND	489	}
c1159152 TH	490
c1159152 TH	491	if (tb[IFLA_IPTUN_ENCAP_TYPE] &&
9f1370c0	492	(type = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE])) != TUNNEL_ENCAP_NONE) {
c1159152 TH	493	__u16 flags = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_FLAGS]);
	494	__u16 sport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_SPORT]);
	495	__u16 dport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_DPORT]);
	496
9deb7542	497	open_json_object("encap");
2539a407	498	print_string(PRINT_FP, NULL, "encap ", NULL);
c1159152 TH	499	switch (type) {
c1159152 TH	500	case TUNNEL_ENCAP_FOU:
2539a407	501	print_string(PRINT_ANY, "type", "%s ", "fou");
c1159152 TH	502	break;
c1159152 TH	503	case TUNNEL_ENCAP_GUE:
2539a407	504	print_string(PRINT_ANY, "type", "%s ", "gue");
c1159152 TH	505	break;
c1159152 TH	506	default:
2539a407	507	print_null(PRINT_ANY, "type", "unknown ", NULL);
c1159152 TH	508	break;
	509	}
	510
2539a407 JF	511	if (is_json_context()) {
	512	print_uint(PRINT_JSON,
	513	"sport",
	514	NULL,
	515	sport ? ntohs(sport) : 0);
	516	print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
	517	print_bool(PRINT_JSON,
	518	"csum",
	519	NULL,
	520	flags & TUNNEL_ENCAP_FLAG_CSUM);
	521	print_bool(PRINT_JSON,
	522	"csum6",
	523	NULL,
	524	flags & TUNNEL_ENCAP_FLAG_CSUM6);
	525	print_bool(PRINT_JSON,
	526	"remcsum",
	527	NULL,
	528	flags & TUNNEL_ENCAP_FLAG_REMCSUM);
	529	close_json_object();
	530	} else {
	531	if (sport == 0)
	532	fputs("encap-sport auto ", f);
	533	else
	534	fprintf(f, "encap-sport %u", ntohs(sport));
c1159152	535
2539a407	536	fprintf(f, "encap-dport %u ", ntohs(dport));
c1159152	537
2539a407 JF	538	if (flags & TUNNEL_ENCAP_FLAG_CSUM)
	539	fputs("encap-csum ", f);
	540	else
	541	fputs("noencap-csum ", f);
c1159152	542
2539a407 JF	543	if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
	544	fputs("encap-csum6 ", f);
	545	else
	546	fputs("noencap-csum6 ", f);
858dbb20	547
2539a407 JF	548	if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
	549	fputs("encap-remcsum ", f);
	550	else
	551	fputs("noencap-remcsum ", f);
	552	}
c1159152	553	}
ad4b1425	554
2539a407 JF	555	if (tb[IFLA_IPTUN_FWMARK]) {
	556	__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
	557
	558	if (fwmark) {
	559	snprintf(s2, sizeof(s2), "0x%x", fwmark);
	560
	561	print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2);
	562	}
	563	}
1ce2de97 ND	564	}
1ce2de97 ND	565
561e650e	566	static void iptunnel_print_help(struct link_util lu, int argc, char *argv,
	567	FILE *f)
	568	{
	569	print_usage(f, strcmp(lu->id, "sit") == 0);
	570	}
	571
1ce2de97 ND	572	struct link_util ipip_link_util = {
	573	.id = "ipip",
	574	.maxattr = IFLA_IPTUN_MAX,
	575	.parse_opt = iptunnel_parse_opt,
	576	.print_opt = iptunnel_print_opt,
561e650e	577	.print_help = iptunnel_print_help,
1ce2de97 ND	578	};
	579
	580	struct link_util sit_link_util = {
	581	.id = "sit",
	582	.maxattr = IFLA_IPTUN_MAX,
	583	.parse_opt = iptunnel_parse_opt,
	584	.print_opt = iptunnel_print_opt,
561e650e	585	.print_help = iptunnel_print_help,
1ce2de97	586	};