[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 = NULL;
	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");
			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])
			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(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, "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(lu->id, "ipip") == 0 &&
			   strcmp(*argv, "mode") == 0) {
			NEXT_ARG();
			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);
	}

	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, "ipip") == 0 || strcmp(lu->id, "sit") == 0)
		addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);

	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;

	if (!tb)
		return;

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

	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] && 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_int(PRINT_ANY, "link_index", "dev %u ", link);
	}

	if (tb[IFLA_IPTUN_TTL]) {
		__u8 ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]);

		if (ttl)
			print_int(PRINT_ANY, "ttl", "ttl %d ", ttl);
		else
			print_int(PRINT_JSON, "ttl", NULL, 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]);

		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	};
86bf43c7	86	struct nlmsghdr *answer = NULL;
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");
86bf43c7	115	free(answer);
1ce2de97 ND	116	return -1;
	117	}
	118
86bf43c7	119	len = answer->nlmsg_len;
1ce2de97 ND	120	len -= NLMSG_LENGTH(sizeof(*ifi));
	121	if (len < 0)
	122	goto get_failed;
	123
86bf43c7	124	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
1ce2de97 ND	125
	126	if (!tb[IFLA_LINKINFO])
	127	goto get_failed;
	128
	129	parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
	130
	131	if (!linkinfo[IFLA_INFO_DATA])
	132	goto get_failed;
	133
	134	parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
	135	linkinfo[IFLA_INFO_DATA]);
	136
	137	if (iptuninfo[IFLA_IPTUN_LOCAL])
	138	laddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LOCAL]);
	139
	140	if (iptuninfo[IFLA_IPTUN_REMOTE])
	141	raddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_REMOTE]);
	142
	143	if (iptuninfo[IFLA_IPTUN_TTL])
	144	ttl = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
	145
	146	if (iptuninfo[IFLA_IPTUN_TOS])
	147	tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]);
	148
	149	if (iptuninfo[IFLA_IPTUN_PMTUDISC])
	150	pmtudisc =
	151	rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]);
	152
	153	if (iptuninfo[IFLA_IPTUN_FLAGS])
	154	iflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_FLAGS]);
	155
	156	if (iptuninfo[IFLA_IPTUN_LINK])
	157	link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
	158
77620be8 ND	159	if (iptuninfo[IFLA_IPTUN_PROTO])
	160	proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
	161
c1159152 TH	162	if (iptuninfo[IFLA_IPTUN_ENCAP_TYPE])
	163	encaptype = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_TYPE]);
	164	if (iptuninfo[IFLA_IPTUN_ENCAP_FLAGS])
	165	encapflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]);
	166	if (iptuninfo[IFLA_IPTUN_ENCAP_SPORT])
	167	encapsport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_SPORT]);
	168	if (iptuninfo[IFLA_IPTUN_ENCAP_DPORT])
	169	encapdport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_DPORT]);
1ce2de97 ND	170	if (iptuninfo[IFLA_IPTUN_6RD_PREFIX])
	171	memcpy(&ip6rdprefix,
	172	RTA_DATA(iptuninfo[IFLA_IPTUN_6RD_PREFIX]),
	173	sizeof(laddr));
	174
	175	if (iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN])
	176	ip6rdprefixlen =
	177	rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN]);
	178
	179	if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX])
	180	ip6rdrelayprefix =
	181	rta_getattr_u32(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX]);
	182
	183	if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN])
	184	ip6rdrelayprefixlen =
	185	rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
4bfe6825 AS	186	if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA])
4bfe6825 AS	187	metadata = 1;
ad4b1425 CG	188
	189	if (iptuninfo[IFLA_IPTUN_FWMARK])
	190	fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]);
	191
86bf43c7	192	free(answer);
1ce2de97 ND	193	}
	194
	195	while (argc > 0) {
	196	if (strcmp(*argv, "remote") == 0) {
	197	NEXT_ARG();
57daab1e	198	raddr = get_addr32(*argv);
1ce2de97 ND	199	} else if (strcmp(*argv, "local") == 0) {
1ce2de97 ND	200	NEXT_ARG();
57daab1e	201	laddr = get_addr32(*argv);
1ce2de97 ND	202	} else if (matches(*argv, "dev") == 0) {
	203	NEXT_ARG();
	204	link = if_nametoindex(*argv);
	205	if (link == 0)
	206	invarg("\"dev\" is invalid", *argv);
	207	} else if (strcmp(*argv, "ttl") == 0 \|\|
	208	strcmp(*argv, "hoplimit") == 0) {
	209	NEXT_ARG();
	210	if (strcmp(*argv, "inherit") != 0) {
	211	if (get_u8(&ttl, *argv, 0))
	212	invarg("invalid TTL\n", *argv);
	213	} else
	214	ttl = 0;
	215	} else if (strcmp(*argv, "tos") == 0 \|\|
	216	strcmp(*argv, "tclass") == 0 \|\|
	217	matches(*argv, "dsfield") == 0) {
	218	__u32 uval;
56f5daac	219
1ce2de97 ND	220	NEXT_ARG();
	221	if (strcmp(*argv, "inherit") != 0) {
	222	if (rtnl_dsfield_a2n(&uval, *argv))
	223	invarg("bad TOS value", *argv);
	224	tos = uval;
	225	} else
	226	tos = 1;
	227	} else if (strcmp(*argv, "nopmtudisc") == 0) {
	228	pmtudisc = 0;
	229	} else if (strcmp(*argv, "pmtudisc") == 0) {
	230	pmtudisc = 1;
	231	} else if (strcmp(lu->id, "sit") == 0 &&
	232	strcmp(*argv, "isatap") == 0) {
	233	iflags \|= SIT_ISATAP;
77620be8 ND	234	} else if (strcmp(lu->id, "sit") == 0 &&
	235	strcmp(*argv, "mode") == 0) {
	236	NEXT_ARG();
	237	if (strcmp(*argv, "ipv6/ipv4") == 0 \|\|
	238	strcmp(*argv, "ip6ip") == 0)
	239	proto = IPPROTO_IPV6;
	240	else if (strcmp(*argv, "ipv4/ipv4") == 0 \|\|
	241	strcmp(*argv, "ipip") == 0 \|\|
	242	strcmp(*argv, "ip4ip4") == 0)
	243	proto = IPPROTO_IPIP;
f005b700 KJ	244	else if (strcmp(*argv, "mpls/ipv4") == 0 \|\|
	245	strcmp(*argv, "mplsip") == 0)
	246	proto = IPPROTO_MPLS;
77620be8 ND	247	else if (strcmp(*argv, "any/ipv4") == 0 \|\|
	248	strcmp(*argv, "any") == 0)
	249	proto = 0;
	250	else
	251	invarg("Cannot guess tunnel mode.", *argv);
288c28bc KJ	252	} else if (strcmp(lu->id, "ipip") == 0 &&
	253	strcmp(*argv, "mode") == 0) {
	254	NEXT_ARG();
	255	if (strcmp(*argv, "ipv4/ipv4") == 0 \|\|
	256	strcmp(*argv, "ipip") == 0 \|\|
	257	strcmp(*argv, "ip4ip4") == 0)
	258	proto = IPPROTO_IPIP;
	259	else if (strcmp(*argv, "mpls/ipv4") == 0 \|\|
	260	strcmp(*argv, "mplsip") == 0)
	261	proto = IPPROTO_MPLS;
	262	else if (strcmp(*argv, "any/ipv4") == 0 \|\|
	263	strcmp(*argv, "any") == 0)
	264	proto = 0;
	265	else
	266	invarg("Cannot guess tunnel mode.", *argv);
c1159152 TH	267	} else if (strcmp(*argv, "noencap") == 0) {
	268	encaptype = TUNNEL_ENCAP_NONE;
	269	} else if (strcmp(*argv, "encap") == 0) {
	270	NEXT_ARG();
	271	if (strcmp(*argv, "fou") == 0)
	272	encaptype = TUNNEL_ENCAP_FOU;
	273	else if (strcmp(*argv, "gue") == 0)
	274	encaptype = TUNNEL_ENCAP_GUE;
	275	else if (strcmp(*argv, "none") == 0)
	276	encaptype = TUNNEL_ENCAP_NONE;
	277	else
	278	invarg("Invalid encap type.", *argv);
	279	} else if (strcmp(*argv, "encap-sport") == 0) {
	280	NEXT_ARG();
	281	if (strcmp(*argv, "auto") == 0)
	282	encapsport = 0;
	283	else if (get_u16(&encapsport, *argv, 0))
	284	invarg("Invalid source port.", *argv);
	285	} else if (strcmp(*argv, "encap-dport") == 0) {
	286	NEXT_ARG();
	287	if (get_u16(&encapdport, *argv, 0))
	288	invarg("Invalid destination port.", *argv);
	289	} else if (strcmp(*argv, "encap-csum") == 0) {
	290	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM;
	291	} else if (strcmp(*argv, "noencap-csum") == 0) {
	292	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
	293	} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
	294	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM6;
	295	} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
	296	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
858dbb20 TH	297	} else if (strcmp(*argv, "encap-remcsum") == 0) {
	298	encapflags \|= TUNNEL_ENCAP_FLAG_REMCSUM;
	299	} else if (strcmp(*argv, "noencap-remcsum") == 0) {
	300	encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
4bfe6825 AS	301	} else if (strcmp(*argv, "external") == 0) {
4bfe6825 AS	302	metadata = 1;
1ce2de97 ND	303	} else if (strcmp(*argv, "6rd-prefix") == 0) {
1ce2de97 ND	304	inet_prefix prefix;
56f5daac	305
1ce2de97 ND	306	NEXT_ARG();
	307	if (get_prefix(&prefix, *argv, AF_INET6))
	308	invarg("invalid 6rd_prefix\n", *argv);
	309	memcpy(&ip6rdprefix, prefix.data, 16);
	310	ip6rdprefixlen = prefix.bitlen;
	311	} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
	312	inet_prefix prefix;
56f5daac	313
1ce2de97 ND	314	NEXT_ARG();
	315	if (get_prefix(&prefix, *argv, AF_INET))
	316	invarg("invalid 6rd-relay_prefix\n", *argv);
	317	memcpy(&ip6rdrelayprefix, prefix.data, 4);
	318	ip6rdrelayprefixlen = prefix.bitlen;
	319	} else if (strcmp(*argv, "6rd-reset") == 0) {
	320	inet_prefix prefix;
56f5daac	321
1ce2de97 ND	322	get_prefix(&prefix, "2002::", AF_INET6);
	323	memcpy(&ip6rdprefix, prefix.data, 16);
	324	ip6rdprefixlen = 16;
	325	ip6rdrelayprefix = 0;
	326	ip6rdrelayprefixlen = 0;
ad4b1425 CG	327	} else if (strcmp(*argv, "fwmark") == 0) {
	328	NEXT_ARG();
	329	if (get_u32(&fwmark, *argv, 0))
	330	invarg("invalid fwmark\n", *argv);
1ce2de97 ND	331	} else
	332	usage(strcmp(lu->id, "sit") == 0);
	333	argc--, argv++;
	334	}
	335
	336	if (ttl && pmtudisc == 0) {
30d07e9e	337	fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
1ce2de97 ND	338	exit(-1);
	339	}
	340
4bfe6825 AS	341	if (metadata) {
	342	addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
	343	return 0;
	344	}
	345
1ce2de97 ND	346	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
	347	addattr32(n, 1024, IFLA_IPTUN_LOCAL, laddr);
	348	addattr32(n, 1024, IFLA_IPTUN_REMOTE, raddr);
	349	addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
	350	addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
	351	addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
ad4b1425	352	addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);
c1159152 TH	353
	354	addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
	355	addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
	356	addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
	357	addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));
	358
288c28bc KJ	359	if (strcmp(lu->id, "ipip") == 0 \|\| strcmp(lu->id, "sit") == 0)
	360	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
	361
1ce2de97 ND	362	if (strcmp(lu->id, "sit") == 0) {
	363	addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
	364	if (ip6rdprefixlen) {
	365	addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
	366	&ip6rdprefix, sizeof(ip6rdprefix));
	367	addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
	368	ip6rdprefixlen);
	369	addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
	370	ip6rdrelayprefix);
	371	addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
	372	ip6rdrelayprefixlen);
	373	}
	374	}
	375
	376	return 0;
	377	}
	378
	379	static void iptunnel_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	380	{
	381	char s1[1024];
	382	char s2[64];
	383	const char *local = "any";
	384	const char *remote = "any";
9f1370c0	385	__u16 prefixlen, type;
1ce2de97 ND	386
	387	if (!tb)
	388	return;
	389
7b178324 PD	390	if (tb[IFLA_IPTUN_COLLECT_METADATA])
	391	print_bool(PRINT_ANY, "external", "external ", true);
	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 ND	410
1ce2de97 ND	411	if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) {
56f5daac	412	unsigned int link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
1ce2de97 ND	413	const char *n = if_indextoname(link, s2);
	414
	415	if (n)
2539a407	416	print_string(PRINT_ANY, "link", "dev %s ", n);
1ce2de97	417	else
2539a407	418	print_int(PRINT_ANY, "link_index", "dev %u ", link);
1ce2de97 ND	419	}
1ce2de97 ND	420
2539a407 JF	421	if (tb[IFLA_IPTUN_TTL]) {
	422	__u8 ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]);
	423
	424	if (ttl)
	425	print_int(PRINT_ANY, "ttl", "ttl %d ", ttl);
	426	else
	427	print_int(PRINT_JSON, "ttl", NULL, ttl);
	428	} else {
	429	print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
	430	}
1ce2de97	431
2539a407	432	if (tb[IFLA_IPTUN_TOS]) {
1ce2de97 ND	433	int tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]);
1ce2de97 ND	434
2539a407 JF	435	if (tos) {
	436	if (is_json_context()) {
	437	print_0xhex(PRINT_JSON, "tos", "%#x", tos);
	438	} else {
	439	fputs("tos ", f);
	440	if (tos == 1)
	441	fputs("inherit ", f);
	442	else
	443	fprintf(f, "0x%x ", tos);
	444	}
	445	}
1ce2de97 ND	446	}
	447
	448	if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC]))
2539a407	449	print_bool(PRINT_ANY, "pmtudisc", "pmtudisc ", true);
1ce2de97	450	else
2539a407	451	print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
1ce2de97 ND	452
1ce2de97 ND	453	if (tb[IFLA_IPTUN_FLAGS]) {
195f0f62	454	__u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]);
1ce2de97	455
195f0f62	456	if (iflags & SIT_ISATAP)
2539a407	457	print_bool(PRINT_ANY, "isatap", "isatap ", true);
1ce2de97 ND	458	}
	459
	460	if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
9f1370c0	461	(prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]))) {
1ce2de97 ND	462	__u16 relayprefixlen =
	463	rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
	464	__u32 relayprefix =
	465	rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]);
	466
2539a407 JF	467	const char *prefix = inet_ntop(AF_INET6,
	468	RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
	469	s1, sizeof(s1));
	470
	471	if (is_json_context()) {
	472	print_string(PRINT_JSON, "prefix", NULL, prefix);
	473	print_int(PRINT_JSON, "prefixlen", NULL, prefixlen);
	474	if (relayprefix) {
	475	print_string(PRINT_JSON,
	476	"relay_prefix",
	477	NULL,
	478	format_host(AF_INET,
	479	4,
	480	&relayprefix));
	481	print_int(PRINT_JSON,
	482	"relay_prefixlen",
	483	NULL,
	484	relayprefixlen);
	485	}
	486	} else {
	487	printf("6rd-prefix %s/%u ", prefix, prefixlen);
	488	if (relayprefix) {
	489	printf("6rd-relay_prefix %s/%u ",
	490	format_host(AF_INET, 4, &relayprefix),
	491	relayprefixlen);
	492	}
1ce2de97 ND	493	}
1ce2de97 ND	494	}
c1159152 TH	495
c1159152 TH	496	if (tb[IFLA_IPTUN_ENCAP_TYPE] &&
9f1370c0	497	(type = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE])) != TUNNEL_ENCAP_NONE) {
c1159152 TH	498	__u16 flags = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_FLAGS]);
	499	__u16 sport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_SPORT]);
	500	__u16 dport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_DPORT]);
	501
2539a407	502	print_string(PRINT_FP, NULL, "encap ", NULL);
c1159152 TH	503	switch (type) {
c1159152 TH	504	case TUNNEL_ENCAP_FOU:
2539a407	505	print_string(PRINT_ANY, "type", "%s ", "fou");
c1159152 TH	506	break;
c1159152 TH	507	case TUNNEL_ENCAP_GUE:
2539a407	508	print_string(PRINT_ANY, "type", "%s ", "gue");
c1159152 TH	509	break;
c1159152 TH	510	default:
2539a407	511	print_null(PRINT_ANY, "type", "unknown ", NULL);
c1159152 TH	512	break;
	513	}
	514
2539a407 JF	515	if (is_json_context()) {
	516	print_uint(PRINT_JSON,
	517	"sport",
	518	NULL,
	519	sport ? ntohs(sport) : 0);
	520	print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
	521	print_bool(PRINT_JSON,
	522	"csum",
	523	NULL,
	524	flags & TUNNEL_ENCAP_FLAG_CSUM);
	525	print_bool(PRINT_JSON,
	526	"csum6",
	527	NULL,
	528	flags & TUNNEL_ENCAP_FLAG_CSUM6);
	529	print_bool(PRINT_JSON,
	530	"remcsum",
	531	NULL,
	532	flags & TUNNEL_ENCAP_FLAG_REMCSUM);
	533	close_json_object();
	534	} else {
	535	if (sport == 0)
	536	fputs("encap-sport auto ", f);
	537	else
	538	fprintf(f, "encap-sport %u", ntohs(sport));
c1159152	539
2539a407	540	fprintf(f, "encap-dport %u ", ntohs(dport));
c1159152	541
2539a407 JF	542	if (flags & TUNNEL_ENCAP_FLAG_CSUM)
	543	fputs("encap-csum ", f);
	544	else
	545	fputs("noencap-csum ", f);
c1159152	546
2539a407 JF	547	if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
	548	fputs("encap-csum6 ", f);
	549	else
	550	fputs("noencap-csum6 ", f);
858dbb20	551
2539a407 JF	552	if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
	553	fputs("encap-remcsum ", f);
	554	else
	555	fputs("noencap-remcsum ", f);
	556	}
c1159152	557	}
ad4b1425	558
2539a407 JF	559	if (tb[IFLA_IPTUN_FWMARK]) {
	560	__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
	561
	562	if (fwmark) {
	563	snprintf(s2, sizeof(s2), "0x%x", fwmark);
	564
	565	print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2);
	566	}
	567	}
1ce2de97 ND	568	}
1ce2de97 ND	569
561e650e	570	static void iptunnel_print_help(struct link_util lu, int argc, char *argv,
	571	FILE *f)
	572	{
	573	print_usage(f, strcmp(lu->id, "sit") == 0);
	574	}
	575
1ce2de97 ND	576	struct link_util ipip_link_util = {
	577	.id = "ipip",
	578	.maxattr = IFLA_IPTUN_MAX,
	579	.parse_opt = iptunnel_parse_opt,
	580	.print_opt = iptunnel_print_opt,
561e650e	581	.print_help = iptunnel_print_help,
1ce2de97 ND	582	};
	583
	584	struct link_util sit_link_util = {
	585	.id = "sit",
	586	.maxattr = IFLA_IPTUN_MAX,
	587	.parse_opt = iptunnel_parse_opt,
	588	.print_opt = iptunnel_print_opt,
561e650e	589	.print_help = iptunnel_print_help,
1ce2de97	590	};