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

static void usage(int sit) __attribute__((noreturn));
static void usage(int sit)
{
	fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n");
	fprintf(stderr, "          type { ipip | sit } [ remote ADDR ] [ local ADDR ]\n");
	fprintf(stderr, "          [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
	fprintf(stderr, "          [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n");
	if (sit) {
		fprintf(stderr, "          [ mode { ip6ip | ipip | any } ]\n");
		fprintf(stderr, "          [ isatap ]\n");
	}
	fprintf(stderr, "\n");
	fprintf(stderr, "Where: NAME := STRING\n");
	fprintf(stderr, "       ADDR := { IP_ADDRESS | any }\n");
	fprintf(stderr, "       TOS  := { NUMBER | inherit }\n");
	fprintf(stderr, "       TTL  := { 1..255 | inherit }\n");
	exit(-1);
}

static int iptunnel_parse_opt(struct link_util *lu, int argc, char **argv,
			      struct nlmsghdr *n)
{
	struct {
		struct nlmsghdr n;
		struct ifinfomsg i;
		char buf[2048];
	} req;
	struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
	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;

	memset(&ip6rdprefix, 0, sizeof(ip6rdprefix));

	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
		memset(&req, 0, sizeof(req));

		req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
		req.n.nlmsg_flags = NLM_F_REQUEST;
		req.n.nlmsg_type = RTM_GETLINK;
		req.i.ifi_family = preferred_family;
		req.i.ifi_index = ifi->ifi_index;

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

		len = req.n.nlmsg_len;
		len -= NLMSG_LENGTH(sizeof(*ifi));
		if (len < 0)
			goto get_failed;

		parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), 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_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]);
	}

	while (argc > 0) {
		if (strcmp(*argv, "remote") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "any"))
				raddr = get_addr32(*argv);
			else
				raddr = 0;
		} else if (strcmp(*argv, "local") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "any"))
				laddr = get_addr32(*argv);
			else
				laddr = 0;
		} 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(lu->id, "sit") == 0 &&
			   strcmp(*argv, "mode") == 0) {
			NEXT_ARG();
			if (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, "any/ipv4") == 0 ||
				 strcmp(*argv, "any") == 0)
				proto = 0;
			else
				invarg("Cannot guess tunnel mode.", *argv);
		} 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
			usage(strcmp(lu->id, "sit") == 0);
		argc--, argv++;
	}

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

	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);
	if (strcmp(lu->id, "sit") == 0) {
		addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
		addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
		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";

	if (!tb)
		return;

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

		if (addr)
			remote = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
	}

	fprintf(f, "remote %s ", remote);

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

		if (addr)
			local = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
	}

	fprintf(f, "local %s ", local);

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

		if (n)
			fprintf(f, "dev %s ", n);
		else
			fprintf(f, "dev %u ", link);
	}

	if (tb[IFLA_IPTUN_TTL] && rta_getattr_u8(tb[IFLA_IPTUN_TTL]))
		fprintf(f, "ttl %d ", rta_getattr_u8(tb[IFLA_IPTUN_TTL]));
	else
		fprintf(f, "ttl inherit ");

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

		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]))
		fprintf(f, "pmtudisc ");
	else
		fprintf(f, "nopmtudisc ");

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

		if (iflags & SIT_ISATAP)
			fprintf(f, "isatap ");
	}

	if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
	    *(__u16 *)RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIXLEN])) {
		__u16 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]);

		printf("6rd-prefix %s/%u ",
		       inet_ntop(AF_INET6, RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
				 s1, sizeof(s1)),
		       prefixlen);
		if (relayprefix) {
			printf("6rd-relay_prefix %s/%u ",
			       format_host(AF_INET, 4, &relayprefix, s1,
					   sizeof(s1)),
			       relayprefixlen);
		}
	}
}

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

struct link_util sit_link_util = {
	.id = "sit",
	.maxattr = IFLA_IPTUN_MAX,
	.parse_opt = iptunnel_parse_opt,
	.print_opt = iptunnel_print_opt,
};
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
	19	#include <linux/ip.h>
	20	#include <linux/if_tunnel.h>
	21	#include "rt_names.h"
	22	#include "utils.h"
	23	#include "ip_common.h"
	24	#include "tunnel.h"
	25
	26	static void usage(int sit) __attribute__((noreturn));
	27	static void usage(int sit)
	28	{
	29	fprintf(stderr, "Usage: ip link { add \| set \| change \| replace \| del } NAME\n");
	30	fprintf(stderr, " type { ipip \| sit } [ remote ADDR ] [ local ADDR ]\n");
	31	fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
	32	fprintf(stderr, " [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n");
77620be8 ND	33	if (sit) {
77620be8 ND	34	fprintf(stderr, " [ mode { ip6ip \| ipip \| any } ]\n");
1ce2de97	35	fprintf(stderr, " [ isatap ]\n");
77620be8	36	}
1ce2de97 ND	37	fprintf(stderr, "\n");
	38	fprintf(stderr, "Where: NAME := STRING\n");
	39	fprintf(stderr, " ADDR := { IP_ADDRESS \| any }\n");
	40	fprintf(stderr, " TOS := { NUMBER \| inherit }\n");
	41	fprintf(stderr, " TTL := { 1..255 \| inherit }\n");
	42	exit(-1);
	43	}
	44
	45	static int iptunnel_parse_opt(struct link_util lu, int argc, char *argv,
	46	struct nlmsghdr *n)
	47	{
	48	struct {
	49	struct nlmsghdr n;
	50	struct ifinfomsg i;
	51	char buf[2048];
	52	} req;
	53	struct ifinfomsg ifi = (struct ifinfomsg )(n + 1);
	54	struct rtattr *tb[IFLA_MAX + 1];
	55	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
	56	struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
	57	int len;
	58	__u32 link = 0;
	59	__u32 laddr = 0;
	60	__u32 raddr = 0;
	61	__u8 ttl = 0;
	62	__u8 tos = 0;
	63	__u8 pmtudisc = 1;
	64	__u16 iflags = 0;
77620be8	65	__u8 proto = 0;
1ce2de97 ND	66	struct in6_addr ip6rdprefix;
	67	__u16 ip6rdprefixlen = 0;
	68	__u32 ip6rdrelayprefix = 0;
	69	__u16 ip6rdrelayprefixlen = 0;
	70
	71	memset(&ip6rdprefix, 0, sizeof(ip6rdprefix));
	72
	73	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
	74	memset(&req, 0, sizeof(req));
	75
	76	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
	77	req.n.nlmsg_flags = NLM_F_REQUEST;
	78	req.n.nlmsg_type = RTM_GETLINK;
	79	req.i.ifi_family = preferred_family;
	80	req.i.ifi_index = ifi->ifi_index;
	81
	82	if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0) {
	83	get_failed:
	84	fprintf(stderr,
	85	"Failed to get existing tunnel info.\n");
	86	return -1;
	87	}
	88
	89	len = req.n.nlmsg_len;
	90	len -= NLMSG_LENGTH(sizeof(*ifi));
	91	if (len < 0)
	92	goto get_failed;
	93
	94	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);
	95
	96	if (!tb[IFLA_LINKINFO])
	97	goto get_failed;
	98
	99	parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
	100
	101	if (!linkinfo[IFLA_INFO_DATA])
	102	goto get_failed;
	103
	104	parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
	105	linkinfo[IFLA_INFO_DATA]);
	106
	107	if (iptuninfo[IFLA_IPTUN_LOCAL])
	108	laddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LOCAL]);
	109
	110	if (iptuninfo[IFLA_IPTUN_REMOTE])
	111	raddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_REMOTE]);
	112
	113	if (iptuninfo[IFLA_IPTUN_TTL])
	114	ttl = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
	115
	116	if (iptuninfo[IFLA_IPTUN_TOS])
	117	tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]);
	118
	119	if (iptuninfo[IFLA_IPTUN_PMTUDISC])
	120	pmtudisc =
	121	rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]);
	122
	123	if (iptuninfo[IFLA_IPTUN_FLAGS])
	124	iflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_FLAGS]);
	125
	126	if (iptuninfo[IFLA_IPTUN_LINK])
	127	link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
	128
77620be8 ND	129	if (iptuninfo[IFLA_IPTUN_PROTO])
	130	proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
	131
1ce2de97 ND	132	if (iptuninfo[IFLA_IPTUN_6RD_PREFIX])
	133	memcpy(&ip6rdprefix,
	134	RTA_DATA(iptuninfo[IFLA_IPTUN_6RD_PREFIX]),
	135	sizeof(laddr));
	136
	137	if (iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN])
	138	ip6rdprefixlen =
	139	rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN]);
	140
	141	if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX])
	142	ip6rdrelayprefix =
	143	rta_getattr_u32(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX]);
	144
	145	if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN])
	146	ip6rdrelayprefixlen =
	147	rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
	148	}
	149
	150	while (argc > 0) {
	151	if (strcmp(*argv, "remote") == 0) {
	152	NEXT_ARG();
	153	if (strcmp(*argv, "any"))
	154	raddr = get_addr32(*argv);
	155	else
	156	raddr = 0;
	157	} else if (strcmp(*argv, "local") == 0) {
	158	NEXT_ARG();
	159	if (strcmp(*argv, "any"))
	160	laddr = get_addr32(*argv);
	161	else
	162	laddr = 0;
	163	} else if (matches(*argv, "dev") == 0) {
	164	NEXT_ARG();
	165	link = if_nametoindex(*argv);
	166	if (link == 0)
	167	invarg("\"dev\" is invalid", *argv);
	168	} else if (strcmp(*argv, "ttl") == 0 \|\|
	169	strcmp(*argv, "hoplimit") == 0) {
	170	NEXT_ARG();
	171	if (strcmp(*argv, "inherit") != 0) {
	172	if (get_u8(&ttl, *argv, 0))
	173	invarg("invalid TTL\n", *argv);
	174	} else
	175	ttl = 0;
	176	} else if (strcmp(*argv, "tos") == 0 \|\|
	177	strcmp(*argv, "tclass") == 0 \|\|
	178	matches(*argv, "dsfield") == 0) {
	179	__u32 uval;
	180	NEXT_ARG();
	181	if (strcmp(*argv, "inherit") != 0) {
	182	if (rtnl_dsfield_a2n(&uval, *argv))
	183	invarg("bad TOS value", *argv);
	184	tos = uval;
	185	} else
	186	tos = 1;
	187	} else if (strcmp(*argv, "nopmtudisc") == 0) {
	188	pmtudisc = 0;
	189	} else if (strcmp(*argv, "pmtudisc") == 0) {
	190	pmtudisc = 1;
	191	} else if (strcmp(lu->id, "sit") == 0 &&
	192	strcmp(*argv, "isatap") == 0) {
	193	iflags \|= SIT_ISATAP;
77620be8 ND	194	} else if (strcmp(lu->id, "sit") == 0 &&
	195	strcmp(*argv, "mode") == 0) {
	196	NEXT_ARG();
	197	if (strcmp(*argv, "ipv6/ipv4") == 0 \|\|
	198	strcmp(*argv, "ip6ip") == 0)
	199	proto = IPPROTO_IPV6;
	200	else if (strcmp(*argv, "ipv4/ipv4") == 0 \|\|
	201	strcmp(*argv, "ipip") == 0 \|\|
	202	strcmp(*argv, "ip4ip4") == 0)
	203	proto = IPPROTO_IPIP;
	204	else if (strcmp(*argv, "any/ipv4") == 0 \|\|
	205	strcmp(*argv, "any") == 0)
	206	proto = 0;
	207	else
	208	invarg("Cannot guess tunnel mode.", *argv);
1ce2de97 ND	209	} else if (strcmp(*argv, "6rd-prefix") == 0) {
	210	inet_prefix prefix;
	211	NEXT_ARG();
	212	if (get_prefix(&prefix, *argv, AF_INET6))
	213	invarg("invalid 6rd_prefix\n", *argv);
	214	memcpy(&ip6rdprefix, prefix.data, 16);
	215	ip6rdprefixlen = prefix.bitlen;
	216	} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
	217	inet_prefix prefix;
	218	NEXT_ARG();
	219	if (get_prefix(&prefix, *argv, AF_INET))
	220	invarg("invalid 6rd-relay_prefix\n", *argv);
	221	memcpy(&ip6rdrelayprefix, prefix.data, 4);
	222	ip6rdrelayprefixlen = prefix.bitlen;
	223	} else if (strcmp(*argv, "6rd-reset") == 0) {
	224	inet_prefix prefix;
	225	get_prefix(&prefix, "2002::", AF_INET6);
	226	memcpy(&ip6rdprefix, prefix.data, 16);
	227	ip6rdprefixlen = 16;
	228	ip6rdrelayprefix = 0;
	229	ip6rdrelayprefixlen = 0;
	230	} else
	231	usage(strcmp(lu->id, "sit") == 0);
	232	argc--, argv++;
	233	}
	234
	235	if (ttl && pmtudisc == 0) {
30d07e9e	236	fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
1ce2de97 ND	237	exit(-1);
	238	}
	239
	240	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
	241	addattr32(n, 1024, IFLA_IPTUN_LOCAL, laddr);
	242	addattr32(n, 1024, IFLA_IPTUN_REMOTE, raddr);
	243	addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
	244	addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
	245	addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
	246	if (strcmp(lu->id, "sit") == 0) {
	247	addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
77620be8	248	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
1ce2de97 ND	249	if (ip6rdprefixlen) {
	250	addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
	251	&ip6rdprefix, sizeof(ip6rdprefix));
	252	addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
	253	ip6rdprefixlen);
	254	addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
	255	ip6rdrelayprefix);
	256	addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
	257	ip6rdrelayprefixlen);
	258	}
	259	}
	260
	261	return 0;
	262	}
	263
	264	static void iptunnel_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	265	{
	266	char s1[1024];
	267	char s2[64];
	268	const char *local = "any";
	269	const char *remote = "any";
	270
	271	if (!tb)
	272	return;
	273
	274	if (tb[IFLA_IPTUN_REMOTE]) {
	275	unsigned addr = rta_getattr_u32(tb[IFLA_IPTUN_REMOTE]);
	276
	277	if (addr)
	278	remote = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
	279	}
	280
	281	fprintf(f, "remote %s ", remote);
	282
	283	if (tb[IFLA_IPTUN_LOCAL]) {
	284	unsigned addr = rta_getattr_u32(tb[IFLA_IPTUN_LOCAL]);
	285
	286	if (addr)
	287	local = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
	288	}
	289
	290	fprintf(f, "local %s ", local);
	291
	292	if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) {
	293	unsigned link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
	294	const char *n = if_indextoname(link, s2);
	295
	296	if (n)
	297	fprintf(f, "dev %s ", n);
	298	else
	299	fprintf(f, "dev %u ", link);
	300	}
	301
	302	if (tb[IFLA_IPTUN_TTL] && rta_getattr_u8(tb[IFLA_IPTUN_TTL]))
	303	fprintf(f, "ttl %d ", rta_getattr_u8(tb[IFLA_IPTUN_TTL]));
	304	else
	305	fprintf(f, "ttl inherit ");
	306
	307	if (tb[IFLA_IPTUN_TOS] && rta_getattr_u8(tb[IFLA_IPTUN_TOS])) {
	308	int tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]);
	309
	310	fputs("tos ", f);
	311	if (tos == 1)
	312	fputs("inherit ", f);
313	else
314	fprintf(f, "0x%x ", tos);
315	}
316
317	if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC]))
318	fprintf(f, "pmtudisc ");
319	else
320	fprintf(f, "nopmtudisc ");
321
322	if (tb[IFLA_IPTUN_FLAGS]) {
195f0f62	323	__u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]);
1ce2de97	324
195f0f62 ND	325	if (iflags & SIT_ISATAP)
195f0f62 ND	326	fprintf(f, "isatap ");
1ce2de97 ND	327	}
	328
	329	if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
	330	(__u16 )RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIXLEN])) {
	331	__u16 prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]);
	332	__u16 relayprefixlen =
	333	rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
	334	__u32 relayprefix =
	335	rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]);
	336
	337	printf("6rd-prefix %s/%u ",
	338	inet_ntop(AF_INET6, RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
195f0f62	339	s1, sizeof(s1)),
1ce2de97 ND	340	prefixlen);
	341	if (relayprefix) {
	342	printf("6rd-relay_prefix %s/%u ",
	343	format_host(AF_INET, 4, &relayprefix, s1,
195f0f62	344	sizeof(s1)),
1ce2de97 ND	345	relayprefixlen);
	346	}
	347	}
	348	}
	349
	350	struct link_util ipip_link_util = {
	351	.id = "ipip",
	352	.maxattr = IFLA_IPTUN_MAX,
	353	.parse_opt = iptunnel_parse_opt,
	354	.print_opt = iptunnel_print_opt,
	355	};
	356
	357	struct link_util sit_link_util = {
	358	.id = "sit",
	359	.maxattr = IFLA_IPTUN_MAX,
	360	.parse_opt = iptunnel_parse_opt,
	361	.print_opt = iptunnel_print_opt,
	362	};