[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 iptunnel_print_help(struct link_util *lu, int argc, char **argv,
				FILE *f)
{
	const char *mode;

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

static int iptunnel_parse_opt(struct link_util *lu, int argc, char **argv,
			      struct nlmsghdr *n)
{
	struct ifinfomsg *ifi = NLMSG_DATA(n);
	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;
	inet_prefix saddr, daddr, ip6rdprefix, ip6rdrelayprefix;
	__u8 pmtudisc = 1;
	__u8 tos = 0;
	__u16 iflags = 0;
	__u8 ttl = 0;
	__u8 proto = 0;
	__u32 link = 0;
	__u16 encaptype = 0;
	__u16 encapflags = 0;
	__u16 encapsport = 0;
	__u16 encapdport = 0;
	__u8 metadata = 0;
	__u32 fwmark = 0;

	inet_prefix_reset(&saddr);
	inet_prefix_reset(&daddr);

	inet_prefix_reset(&ip6rdprefix);
	inet_prefix_reset(&ip6rdrelayprefix);

	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
		const struct rtattr *rta;

		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]);

		rta = iptuninfo[IFLA_IPTUN_LOCAL];
		if (rta && get_addr_rta(&saddr, rta, AF_INET))
			goto get_failed;

		rta = iptuninfo[IFLA_IPTUN_REMOTE];
		if (rta && get_addr_rta(&daddr, rta, AF_INET))
			goto get_failed;

		rta = iptuninfo[IFLA_IPTUN_6RD_PREFIX];
		if (rta && get_addr_rta(&ip6rdprefix, rta, AF_INET6))
			goto get_failed;

		rta = iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX];
		if (rta && get_addr_rta(&ip6rdrelayprefix, rta, AF_INET))
			goto get_failed;

		rta = iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN];
		ip6rdprefix.bitlen = rta ? rta_getattr_u16(rta) : 0;

		rta = iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN];
		ip6rdrelayprefix.bitlen = rta ? rta_getattr_u16(rta) : 0;

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

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

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

		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_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, "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, "remote") == 0) {
			NEXT_ARG();
			get_addr(&daddr, *argv, AF_INET);
		} else if (strcmp(*argv, "local") == 0) {
			NEXT_ARG();
			get_addr(&saddr, *argv, AF_INET);
		} else if (matches(*argv, "dev") == 0) {
			NEXT_ARG();
			link = ll_name_to_index(*argv);
			if (!link)
				exit(nodev(*argv));
		} else if (strcmp(*argv, "ttl") == 0 ||
			   strcmp(*argv, "hoplimit") == 0 ||
			   strcmp(*argv, "hlim") == 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 ||
			   strcmp(*argv, "tc") == 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, "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) {
			NEXT_ARG();
			if (get_prefix(&ip6rdprefix, *argv, AF_INET6))
				invarg("invalid 6rd_prefix\n", *argv);
		} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
			NEXT_ARG();
			if (get_prefix(&ip6rdrelayprefix, *argv, AF_INET))
				invarg("invalid 6rd-relay_prefix\n", *argv);
		} else if (strcmp(*argv, "6rd-reset") == 0) {
			get_prefix(&ip6rdprefix, "2002::/16", AF_INET6);
			inet_prefix_reset(&ip6rdrelayprefix);
		} else if (strcmp(*argv, "fwmark") == 0) {
			NEXT_ARG();
			if (get_u32(&fwmark, *argv, 0))
				invarg("invalid fwmark\n", *argv);
		} else {
			iptunnel_print_help(lu, argc, argv, stderr);
			return -1;
		}
		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;
	}

	if (is_addrtype_inet_not_unspec(&saddr)) {
		addattr_l(n, 1024, IFLA_IPTUN_LOCAL,
			  saddr.data, saddr.bytelen);
	}
	if (is_addrtype_inet_not_unspec(&daddr)) {
		addattr_l(n, 1024, IFLA_IPTUN_REMOTE,
			  daddr.data, daddr.bytelen);
	}
	addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
	addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
	addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
	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));

	if (strcmp(lu->id, "sit") == 0) {
		addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
		if (is_addrtype_inet(&ip6rdprefix)) {
			addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
				  ip6rdprefix.data, ip6rdprefix.bytelen);
			addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
				  ip6rdprefix.bitlen);
		}
		if (is_addrtype_inet(&ip6rdrelayprefix)) {
			addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
				  ip6rdrelayprefix.data[0]);
			addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
				  ip6rdrelayprefix.bitlen);
		}
	}

	return 0;
}

static void iptunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
	char s2[64];
	__u16 prefixlen;
	__u8 ttl = 0;
	__u8 tos = 0;

	if (!tb)
		return;

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

	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;
		}
	}

	tnl_print_endpoint("remote", tb[IFLA_IPTUN_REMOTE], AF_INET);
	tnl_print_endpoint("local", tb[IFLA_IPTUN_LOCAL], AF_INET);

	if (tb[IFLA_IPTUN_LINK]) {
		__u32 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])
		tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]);
	if (tos) {
		if (is_json_context() || tos != 1)
			print_0xhex(PRINT_ANY, "tos", "tos 0x%x ", tos);
		else
			print_string(PRINT_FP, NULL, "tos %s ", "inherit");
	}

	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]),
					       s2, sizeof(s2));

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

		if (fwmark) {
			print_0xhex(PRINT_ANY,
				    "fwmark", "fwmark 0x%x ", fwmark);
		}
	}

	tnl_print_encap(tb,
			IFLA_IPTUN_ENCAP_TYPE,
			IFLA_IPTUN_ENCAP_FLAGS,
			IFLA_IPTUN_ENCAP_SPORT,
			IFLA_IPTUN_ENCAP_DPORT);
}

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
06e3975f SP	27	static void iptunnel_print_help(struct link_util lu, int argc, char *argv,
06e3975f SP	28	FILE *f)
1ce2de97	29	{
06e3975f	30	const char *mode;
8b471354 PS	31
8b471354 PS	32	fprintf(f,
06e3975f SP	33	"Usage: ... %-6s [ remote ADDR ]\n",
	34	lu->id
	35	);
	36	fprintf(f,
	37	" [ local ADDR ]\n"
	38	" [ ttl TTL ]\n"
	39	" [ tos TOS ]\n"
	40	" [ [no]pmtudisc ]\n"
	41	" [ 6rd-prefix ADDR ]\n"
	42	" [ 6rd-relay_prefix ADDR ]\n"
	43	" [ 6rd-reset ]\n"
	44	" [ dev PHYS_DEV ]\n"
	45	" [ fwmark MARK ]\n"
	46	" [ external ]\n"
	47	" [ noencap ]\n"
	48	" [ encap { fou \| gue \| none } ]\n"
	49	" [ encap-sport PORT ]\n"
	50	" [ encap-dport PORT ]\n"
	51	" [ [no]encap-csum ]\n"
	52	" [ [no]encap-csum6 ]\n"
	53	" [ [no]encap-remcsum ]\n"
8b471354	54	);
06e3975f SP	55	if (strcmp(lu->id, "sit") == 0) {
	56	mode = "{ ip6ip \| ipip \| mplsip \| any } ]\n"
	57	" [ isatap";
288c28bc	58	} else {
06e3975f	59	mode = "{ ipip \| mplsip \| any }";
77620be8	60	}
06e3975f SP	61	fprintf(f,
	62	" [ mode %s ]\n"
	63	"\n",
	64	mode
	65	);
	66	fprintf(f,
	67	"Where: ADDR := { IP_ADDRESS \| any }\n"
	68	" TOS := { NUMBER \| inherit }\n"
	69	" TTL := { 1..255 \| inherit }\n"
	70	" MARK := { 0x0..0xffffffff }\n"
	71	);
1ce2de97 ND	72	}
	73
	74	static int iptunnel_parse_opt(struct link_util lu, int argc, char *argv,
	75	struct nlmsghdr *n)
	76	{
28254695	77	struct ifinfomsg *ifi = NLMSG_DATA(n);
1ce2de97 ND	78	struct {
	79	struct nlmsghdr n;
	80	struct ifinfomsg i;
d17b136f PS	81	} req = {
	82	.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
	83	.n.nlmsg_flags = NLM_F_REQUEST,
	84	.n.nlmsg_type = RTM_GETLINK,
	85	.i.ifi_family = preferred_family,
	86	.i.ifi_index = ifi->ifi_index,
	87	};
08ede25f	88	struct nlmsghdr *answer;
1ce2de97 ND	89	struct rtattr *tb[IFLA_MAX + 1];
	90	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
	91	struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
	92	int len;
7bda9fd3	93	inet_prefix saddr, daddr, ip6rdprefix, ip6rdrelayprefix;
1ce2de97	94	__u8 pmtudisc = 1;
5bd93795	95	__u8 tos = 0;
1ce2de97	96	__u16 iflags = 0;
5bd93795	97	__u8 ttl = 0;
5bd93795 SP	98	__u8 proto = 0;
5bd93795 SP	99	__u32 link = 0;
c1159152 TH	100	__u16 encaptype = 0;
	101	__u16 encapflags = 0;
	102	__u16 encapsport = 0;
	103	__u16 encapdport = 0;
4bfe6825	104	__u8 metadata = 0;
ad4b1425	105	__u32 fwmark = 0;
1ce2de97	106
7bda9fd3 SP	107	inet_prefix_reset(&saddr);
	108	inet_prefix_reset(&daddr);
	109
	110	inet_prefix_reset(&ip6rdprefix);
	111	inet_prefix_reset(&ip6rdrelayprefix);
	112
1ce2de97	113	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
7bda9fd3 SP	114	const struct rtattr *rta;
7bda9fd3 SP	115
86bf43c7	116	if (rtnl_talk(&rth, &req.n, &answer) < 0) {
1ce2de97 ND	117	get_failed:
	118	fprintf(stderr,
	119	"Failed to get existing tunnel info.\n");
	120	return -1;
	121	}
	122
86bf43c7	123	len = answer->nlmsg_len;
1ce2de97 ND	124	len -= NLMSG_LENGTH(sizeof(*ifi));
	125	if (len < 0)
	126	goto get_failed;
	127
86bf43c7	128	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
1ce2de97 ND	129
	130	if (!tb[IFLA_LINKINFO])
	131	goto get_failed;
	132
	133	parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
	134
	135	if (!linkinfo[IFLA_INFO_DATA])
	136	goto get_failed;
	137
	138	parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
	139	linkinfo[IFLA_INFO_DATA]);
	140
7bda9fd3 SP	141	rta = iptuninfo[IFLA_IPTUN_LOCAL];
	142	if (rta && get_addr_rta(&saddr, rta, AF_INET))
	143	goto get_failed;
	144
	145	rta = iptuninfo[IFLA_IPTUN_REMOTE];
	146	if (rta && get_addr_rta(&daddr, rta, AF_INET))
	147	goto get_failed;
	148
	149	rta = iptuninfo[IFLA_IPTUN_6RD_PREFIX];
	150	if (rta && get_addr_rta(&ip6rdprefix, rta, AF_INET6))
	151	goto get_failed;
	152
	153	rta = iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX];
	154	if (rta && get_addr_rta(&ip6rdrelayprefix, rta, AF_INET))
	155	goto get_failed;
	156
	157	rta = iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN];
	158	ip6rdprefix.bitlen = rta ? rta_getattr_u16(rta) : 0;
1ce2de97	159
7bda9fd3 SP	160	rta = iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN];
7bda9fd3 SP	161	ip6rdrelayprefix.bitlen = rta ? rta_getattr_u16(rta) : 0;
1ce2de97 ND	162
	163	if (iptuninfo[IFLA_IPTUN_TTL])
	164	ttl = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
	165
1ce2de97 ND	166	if (iptuninfo[IFLA_IPTUN_PMTUDISC])
	167	pmtudisc =
	168	rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]);
	169
5bd93795 SP	170	if (iptuninfo[IFLA_IPTUN_TOS])
	171	tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]);
	172
1ce2de97 ND	173	if (iptuninfo[IFLA_IPTUN_FLAGS])
	174	iflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_FLAGS]);
	175
	176	if (iptuninfo[IFLA_IPTUN_LINK])
	177	link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
	178
77620be8 ND	179	if (iptuninfo[IFLA_IPTUN_PROTO])
	180	proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
	181
c1159152 TH	182	if (iptuninfo[IFLA_IPTUN_ENCAP_TYPE])
	183	encaptype = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_TYPE]);
	184	if (iptuninfo[IFLA_IPTUN_ENCAP_FLAGS])
	185	encapflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]);
	186	if (iptuninfo[IFLA_IPTUN_ENCAP_SPORT])
	187	encapsport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_SPORT]);
	188	if (iptuninfo[IFLA_IPTUN_ENCAP_DPORT])
	189	encapdport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_DPORT]);
7bda9fd3	190
4bfe6825 AS	191	if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA])
4bfe6825 AS	192	metadata = 1;
ad4b1425 CG	193
	194	if (iptuninfo[IFLA_IPTUN_FWMARK])
	195	fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]);
	196
86bf43c7	197	free(answer);
1ce2de97 ND	198	}
	199
	200	while (argc > 0) {
5bd93795 SP	201	if (strcmp(*argv, "mode") == 0) {
	202	NEXT_ARG();
	203	if (strcmp(lu->id, "sit") == 0 &&
	204	(strcmp(*argv, "ipv6/ipv4") == 0 \|\|
	205	strcmp(*argv, "ip6ip") == 0))
	206	proto = IPPROTO_IPV6;
	207	else if (strcmp(*argv, "ipv4/ipv4") == 0 \|\|
	208	strcmp(*argv, "ipip") == 0 \|\|
	209	strcmp(*argv, "ip4ip4") == 0)
	210	proto = IPPROTO_IPIP;
	211	else if (strcmp(*argv, "mpls/ipv4") == 0 \|\|
	212	strcmp(*argv, "mplsip") == 0)
	213	proto = IPPROTO_MPLS;
	214	else if (strcmp(*argv, "any/ipv4") == 0 \|\|
	215	strcmp(*argv, "any") == 0)
	216	proto = 0;
	217	else
	218	invarg("Cannot guess tunnel mode.", *argv);
	219	} else if (strcmp(*argv, "remote") == 0) {
1ce2de97	220	NEXT_ARG();
7bda9fd3	221	get_addr(&daddr, *argv, AF_INET);
1ce2de97 ND	222	} else if (strcmp(*argv, "local") == 0) {
1ce2de97 ND	223	NEXT_ARG();
7bda9fd3	224	get_addr(&saddr, *argv, AF_INET);
1ce2de97 ND	225	} else if (matches(*argv, "dev") == 0) {
1ce2de97 ND	226	NEXT_ARG();
7a14358b	227	link = ll_name_to_index(*argv);
fe99adbc SP	228	if (!link)
fe99adbc SP	229	exit(nodev(*argv));
1ce2de97	230	} else if (strcmp(*argv, "ttl") == 0 \|\|
c4743c4d SP	231	strcmp(*argv, "hoplimit") == 0 \|\|
c4743c4d SP	232	strcmp(*argv, "hlim") == 0) {
1ce2de97 ND	233	NEXT_ARG();
	234	if (strcmp(*argv, "inherit") != 0) {
	235	if (get_u8(&ttl, *argv, 0))
	236	invarg("invalid TTL\n", *argv);
	237	} else
	238	ttl = 0;
	239	} else if (strcmp(*argv, "tos") == 0 \|\|
	240	strcmp(*argv, "tclass") == 0 \|\|
5bd93795	241	strcmp(*argv, "tc") == 0 \|\|
1ce2de97 ND	242	matches(*argv, "dsfield") == 0) {
1ce2de97 ND	243	__u32 uval;
56f5daac	244
1ce2de97 ND	245	NEXT_ARG();
	246	if (strcmp(*argv, "inherit") != 0) {
	247	if (rtnl_dsfield_a2n(&uval, *argv))
	248	invarg("bad TOS value", *argv);
	249	tos = uval;
	250	} else
	251	tos = 1;
	252	} else if (strcmp(*argv, "nopmtudisc") == 0) {
	253	pmtudisc = 0;
	254	} else if (strcmp(*argv, "pmtudisc") == 0) {
	255	pmtudisc = 1;
	256	} else if (strcmp(lu->id, "sit") == 0 &&
	257	strcmp(*argv, "isatap") == 0) {
	258	iflags \|= SIT_ISATAP;
c1159152 TH	259	} else if (strcmp(*argv, "noencap") == 0) {
	260	encaptype = TUNNEL_ENCAP_NONE;
	261	} else if (strcmp(*argv, "encap") == 0) {
	262	NEXT_ARG();
	263	if (strcmp(*argv, "fou") == 0)
	264	encaptype = TUNNEL_ENCAP_FOU;
	265	else if (strcmp(*argv, "gue") == 0)
	266	encaptype = TUNNEL_ENCAP_GUE;
	267	else if (strcmp(*argv, "none") == 0)
	268	encaptype = TUNNEL_ENCAP_NONE;
	269	else
	270	invarg("Invalid encap type.", *argv);
	271	} else if (strcmp(*argv, "encap-sport") == 0) {
	272	NEXT_ARG();
	273	if (strcmp(*argv, "auto") == 0)
	274	encapsport = 0;
	275	else if (get_u16(&encapsport, *argv, 0))
	276	invarg("Invalid source port.", *argv);
	277	} else if (strcmp(*argv, "encap-dport") == 0) {
	278	NEXT_ARG();
	279	if (get_u16(&encapdport, *argv, 0))
	280	invarg("Invalid destination port.", *argv);
	281	} else if (strcmp(*argv, "encap-csum") == 0) {
	282	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM;
	283	} else if (strcmp(*argv, "noencap-csum") == 0) {
	284	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
	285	} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
	286	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM6;
	287	} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
	288	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
858dbb20 TH	289	} else if (strcmp(*argv, "encap-remcsum") == 0) {
	290	encapflags \|= TUNNEL_ENCAP_FLAG_REMCSUM;
	291	} else if (strcmp(*argv, "noencap-remcsum") == 0) {
	292	encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
4bfe6825 AS	293	} else if (strcmp(*argv, "external") == 0) {
4bfe6825 AS	294	metadata = 1;
1ce2de97	295	} else if (strcmp(*argv, "6rd-prefix") == 0) {
1ce2de97	296	NEXT_ARG();
7bda9fd3	297	if (get_prefix(&ip6rdprefix, *argv, AF_INET6))
1ce2de97	298	invarg("invalid 6rd_prefix\n", *argv);
1ce2de97	299	} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
1ce2de97	300	NEXT_ARG();
7bda9fd3	301	if (get_prefix(&ip6rdrelayprefix, *argv, AF_INET))
1ce2de97	302	invarg("invalid 6rd-relay_prefix\n", *argv);
1ce2de97	303	} else if (strcmp(*argv, "6rd-reset") == 0) {
7bda9fd3 SP	304	get_prefix(&ip6rdprefix, "2002::/16", AF_INET6);
7bda9fd3 SP	305	inet_prefix_reset(&ip6rdrelayprefix);
ad4b1425 CG	306	} else if (strcmp(*argv, "fwmark") == 0) {
	307	NEXT_ARG();
	308	if (get_u32(&fwmark, *argv, 0))
	309	invarg("invalid fwmark\n", *argv);
06e3975f SP	310	} else {
	311	iptunnel_print_help(lu, argc, argv, stderr);
	312	return -1;
	313	}
1ce2de97 ND	314	argc--, argv++;
	315	}
	316
	317	if (ttl && pmtudisc == 0) {
30d07e9e	318	fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
1ce2de97 ND	319	exit(-1);
	320	}
	321
68a7f5ed	322	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
4bfe6825 AS	323	if (metadata) {
	324	addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
	325	return 0;
	326	}
	327
fa1e658e	328	if (is_addrtype_inet_not_unspec(&saddr)) {
7bda9fd3 SP	329	addattr_l(n, 1024, IFLA_IPTUN_LOCAL,
	330	saddr.data, saddr.bytelen);
	331	}
fa1e658e	332	if (is_addrtype_inet_not_unspec(&daddr)) {
7bda9fd3 SP	333	addattr_l(n, 1024, IFLA_IPTUN_REMOTE,
	334	daddr.data, daddr.bytelen);
	335	}
1ce2de97	336	addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
5bd93795 SP	337	addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
	338	addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
	339	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
ad4b1425	340	addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);
c1159152 TH	341
	342	addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
	343	addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
	344	addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
	345	addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));
	346
1ce2de97 ND	347	if (strcmp(lu->id, "sit") == 0) {
1ce2de97 ND	348	addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
7bda9fd3	349	if (is_addrtype_inet(&ip6rdprefix)) {
1ce2de97	350	addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
7bda9fd3	351	ip6rdprefix.data, ip6rdprefix.bytelen);
1ce2de97	352	addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
7bda9fd3 SP	353	ip6rdprefix.bitlen);
	354	}
	355	if (is_addrtype_inet(&ip6rdrelayprefix)) {
1ce2de97	356	addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
7bda9fd3	357	ip6rdrelayprefix.data[0]);
1ce2de97	358	addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
7bda9fd3	359	ip6rdrelayprefix.bitlen);
1ce2de97 ND	360	}
	361	}
	362
	363	return 0;
	364	}
	365
	366	static void iptunnel_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	367	{
1ce2de97	368	char s2[64];
bad76e6b	369	__u16 prefixlen;
375560c4	370	__u8 ttl = 0;
3caa526c	371	__u8 tos = 0;
1ce2de97 ND	372
	373	if (!tb)
	374	return;
	375
00ff4b8e SP	376	if (tb[IFLA_IPTUN_COLLECT_METADATA]) {
	377	print_bool(PRINT_ANY, "external", "external", true);
	378	return;
	379	}
7b178324	380
d9aefbc0 SP	381	if (tb[IFLA_IPTUN_PROTO]) {
	382	switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
	383	case IPPROTO_IPIP:
	384	print_string(PRINT_ANY, "proto", "%s ", "ipip");
	385	break;
	386	case IPPROTO_IPV6:
	387	print_string(PRINT_ANY, "proto", "%s ", "ip6ip");
	388	break;
	389	case IPPROTO_MPLS:
	390	print_string(PRINT_ANY, "proto", "%s ", "mplsip");
	391	break;
	392	case 0:
	393	print_string(PRINT_ANY, "proto", "%s ", "any");
	394	break;
	395	}
	396	}
	397
b761fc41 SP	398	tnl_print_endpoint("remote", tb[IFLA_IPTUN_REMOTE], AF_INET);
b761fc41 SP	399	tnl_print_endpoint("local", tb[IFLA_IPTUN_LOCAL], AF_INET);
1ce2de97	400
45d3a6ef	401	if (tb[IFLA_IPTUN_LINK]) {
5bd93795	402	__u32 link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
1ce2de97	403
45d3a6ef SP	404	if (link) {
	405	print_string(PRINT_ANY, "link", "dev %s ",
	406	ll_index_to_name(link));
	407	}
1ce2de97 ND	408	}
1ce2de97 ND	409
375560c4 SP	410	if (tb[IFLA_IPTUN_TTL])
	411	ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]);
	412	if (is_json_context() \|\| ttl)
	413	print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
	414	else
2539a407	415	print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
1ce2de97	416
3caa526c SP	417	if (tb[IFLA_IPTUN_TOS])
	418	tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]);
	419	if (tos) {
	420	if (is_json_context() \|\| tos != 1)
	421	print_0xhex(PRINT_ANY, "tos", "tos 0x%x ", tos);
	422	else
	423	print_string(PRINT_FP, NULL, "tos %s ", "inherit");
1ce2de97 ND	424	}
	425
	426	if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC]))
2539a407	427	print_bool(PRINT_ANY, "pmtudisc", "pmtudisc ", true);
1ce2de97	428	else
2539a407	429	print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
1ce2de97 ND	430
1ce2de97 ND	431	if (tb[IFLA_IPTUN_FLAGS]) {
195f0f62	432	__u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]);
1ce2de97	433
195f0f62	434	if (iflags & SIT_ISATAP)
2539a407	435	print_bool(PRINT_ANY, "isatap", "isatap ", true);
1ce2de97 ND	436	}
	437
	438	if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
9f1370c0	439	(prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]))) {
1ce2de97 ND	440	__u16 relayprefixlen =
	441	rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
	442	__u32 relayprefix =
	443	rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]);
	444
2539a407 JF	445	const char *prefix = inet_ntop(AF_INET6,
2539a407 JF	446	RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
e97ad3d2	447	s2, sizeof(s2));
2539a407 JF	448
	449	if (is_json_context()) {
	450	print_string(PRINT_JSON, "prefix", NULL, prefix);
	451	print_int(PRINT_JSON, "prefixlen", NULL, prefixlen);
	452	if (relayprefix) {
	453	print_string(PRINT_JSON,
	454	"relay_prefix",
	455	NULL,
	456	format_host(AF_INET,
	457	4,
	458	&relayprefix));
	459	print_int(PRINT_JSON,
	460	"relay_prefixlen",
	461	NULL,
	462	relayprefixlen);
	463	}
	464	} else {
	465	printf("6rd-prefix %s/%u ", prefix, prefixlen);
	466	if (relayprefix) {
	467	printf("6rd-relay_prefix %s/%u ",
	468	format_host(AF_INET, 4, &relayprefix),
	469	relayprefixlen);
	470	}
1ce2de97 ND	471	}
1ce2de97 ND	472	}
c1159152	473
e97ad3d2 SP	474	if (tb[IFLA_IPTUN_FWMARK]) {
	475	__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
	476
	477	if (fwmark) {
	478	print_0xhex(PRINT_ANY,
	479	"fwmark", "fwmark 0x%x ", fwmark);
	480	}
	481	}
	482
bad76e6b SP	483	tnl_print_encap(tb,
	484	IFLA_IPTUN_ENCAP_TYPE,
	485	IFLA_IPTUN_ENCAP_FLAGS,
	486	IFLA_IPTUN_ENCAP_SPORT,
	487	IFLA_IPTUN_ENCAP_DPORT);
1ce2de97 ND	488	}
	489
	490	struct link_util ipip_link_util = {
	491	.id = "ipip",
	492	.maxattr = IFLA_IPTUN_MAX,
	493	.parse_opt = iptunnel_parse_opt,
	494	.print_opt = iptunnel_print_opt,
561e650e	495	.print_help = iptunnel_print_help,
1ce2de97 ND	496	};
	497
	498	struct link_util sit_link_util = {
	499	.id = "sit",
	500	.maxattr = IFLA_IPTUN_MAX,
	501	.parse_opt = iptunnel_parse_opt,
	502	.print_opt = iptunnel_print_opt,
561e650e	503	.print_help = iptunnel_print_help,
1ce2de97	504	};