[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 = ll_name_to_index(*argv);
			if (link == 0)
				invarg("\"dev\" is invalid", *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 ||
			   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 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]) {
		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])
		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);
}

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) {
1ce2de97 ND	202	NEXT_ARG();
7a14358b	203	link = ll_name_to_index(*argv);
1ce2de97 ND	204	if (link == 0)
	205	invarg("\"dev\" is invalid", *argv);
	206	} else if (strcmp(*argv, "ttl") == 0 \|\|
c4743c4d SP	207	strcmp(*argv, "hoplimit") == 0 \|\|
c4743c4d SP	208	strcmp(*argv, "hlim") == 0) {
1ce2de97 ND	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;
68a7f5ed	234	} else if (strcmp(*argv, "mode") == 0) {
77620be8	235	NEXT_ARG();
68a7f5ed SP	236	if (strcmp(lu->id, "sit") == 0 &&
	237	(strcmp(*argv, "ipv6/ipv4") == 0 \|\|
	238	strcmp(*argv, "ip6ip") == 0))
77620be8 ND	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);
c1159152 TH	252	} else if (strcmp(*argv, "noencap") == 0) {
	253	encaptype = TUNNEL_ENCAP_NONE;
	254	} else if (strcmp(*argv, "encap") == 0) {
	255	NEXT_ARG();
	256	if (strcmp(*argv, "fou") == 0)
	257	encaptype = TUNNEL_ENCAP_FOU;
	258	else if (strcmp(*argv, "gue") == 0)
	259	encaptype = TUNNEL_ENCAP_GUE;
	260	else if (strcmp(*argv, "none") == 0)
	261	encaptype = TUNNEL_ENCAP_NONE;
	262	else
	263	invarg("Invalid encap type.", *argv);
	264	} else if (strcmp(*argv, "encap-sport") == 0) {
	265	NEXT_ARG();
	266	if (strcmp(*argv, "auto") == 0)
	267	encapsport = 0;
	268	else if (get_u16(&encapsport, *argv, 0))
	269	invarg("Invalid source port.", *argv);
	270	} else if (strcmp(*argv, "encap-dport") == 0) {
	271	NEXT_ARG();
	272	if (get_u16(&encapdport, *argv, 0))
	273	invarg("Invalid destination port.", *argv);
	274	} else if (strcmp(*argv, "encap-csum") == 0) {
	275	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM;
	276	} else if (strcmp(*argv, "noencap-csum") == 0) {
	277	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
	278	} else if (strcmp(*argv, "encap-udp6-csum") == 0) {
	279	encapflags \|= TUNNEL_ENCAP_FLAG_CSUM6;
	280	} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
	281	encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
858dbb20 TH	282	} else if (strcmp(*argv, "encap-remcsum") == 0) {
	283	encapflags \|= TUNNEL_ENCAP_FLAG_REMCSUM;
	284	} else if (strcmp(*argv, "noencap-remcsum") == 0) {
	285	encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
4bfe6825 AS	286	} else if (strcmp(*argv, "external") == 0) {
4bfe6825 AS	287	metadata = 1;
1ce2de97 ND	288	} else if (strcmp(*argv, "6rd-prefix") == 0) {
1ce2de97 ND	289	inet_prefix prefix;
56f5daac	290
1ce2de97 ND	291	NEXT_ARG();
	292	if (get_prefix(&prefix, *argv, AF_INET6))
	293	invarg("invalid 6rd_prefix\n", *argv);
	294	memcpy(&ip6rdprefix, prefix.data, 16);
	295	ip6rdprefixlen = prefix.bitlen;
	296	} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
	297	inet_prefix prefix;
56f5daac	298
1ce2de97 ND	299	NEXT_ARG();
	300	if (get_prefix(&prefix, *argv, AF_INET))
	301	invarg("invalid 6rd-relay_prefix\n", *argv);
	302	memcpy(&ip6rdrelayprefix, prefix.data, 4);
	303	ip6rdrelayprefixlen = prefix.bitlen;
	304	} else if (strcmp(*argv, "6rd-reset") == 0) {
	305	inet_prefix prefix;
56f5daac	306
1ce2de97 ND	307	get_prefix(&prefix, "2002::", AF_INET6);
	308	memcpy(&ip6rdprefix, prefix.data, 16);
	309	ip6rdprefixlen = 16;
	310	ip6rdrelayprefix = 0;
	311	ip6rdrelayprefixlen = 0;
ad4b1425 CG	312	} else if (strcmp(*argv, "fwmark") == 0) {
	313	NEXT_ARG();
	314	if (get_u32(&fwmark, *argv, 0))
	315	invarg("invalid fwmark\n", *argv);
1ce2de97 ND	316	} else
	317	usage(strcmp(lu->id, "sit") == 0);
	318	argc--, argv++;
	319	}
	320
	321	if (ttl && pmtudisc == 0) {
30d07e9e	322	fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
1ce2de97 ND	323	exit(-1);
	324	}
	325
68a7f5ed	326	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
4bfe6825 AS	327	if (metadata) {
	328	addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
	329	return 0;
	330	}
	331
1ce2de97 ND	332	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
	333	addattr32(n, 1024, IFLA_IPTUN_LOCAL, laddr);
	334	addattr32(n, 1024, IFLA_IPTUN_REMOTE, raddr);
	335	addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
	336	addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
	337	addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
ad4b1425	338	addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);
c1159152 TH	339
	340	addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
	341	addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
	342	addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
	343	addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));
	344
1ce2de97 ND	345	if (strcmp(lu->id, "sit") == 0) {
	346	addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
	347	if (ip6rdprefixlen) {
	348	addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
	349	&ip6rdprefix, sizeof(ip6rdprefix));
	350	addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
	351	ip6rdprefixlen);
	352	addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
	353	ip6rdrelayprefix);
	354	addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
	355	ip6rdrelayprefixlen);
	356	}
	357	}
	358
	359	return 0;
	360	}
	361
	362	static void iptunnel_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	363	{
1ce2de97	364	char s2[64];
bad76e6b	365	__u16 prefixlen;
375560c4	366	__u8 ttl = 0;
3caa526c	367	__u8 tos = 0;
1ce2de97 ND	368
	369	if (!tb)
	370	return;
	371
00ff4b8e SP	372	if (tb[IFLA_IPTUN_COLLECT_METADATA]) {
	373	print_bool(PRINT_ANY, "external", "external", true);
	374	return;
	375	}
7b178324	376
d9aefbc0 SP	377	if (tb[IFLA_IPTUN_PROTO]) {
	378	switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
	379	case IPPROTO_IPIP:
	380	print_string(PRINT_ANY, "proto", "%s ", "ipip");
	381	break;
	382	case IPPROTO_IPV6:
	383	print_string(PRINT_ANY, "proto", "%s ", "ip6ip");
	384	break;
	385	case IPPROTO_MPLS:
	386	print_string(PRINT_ANY, "proto", "%s ", "mplsip");
	387	break;
	388	case 0:
	389	print_string(PRINT_ANY, "proto", "%s ", "any");
	390	break;
	391	}
	392	}
	393
b761fc41 SP	394	tnl_print_endpoint("remote", tb[IFLA_IPTUN_REMOTE], AF_INET);
b761fc41 SP	395	tnl_print_endpoint("local", tb[IFLA_IPTUN_LOCAL], AF_INET);
1ce2de97	396
45d3a6ef	397	if (tb[IFLA_IPTUN_LINK]) {
56f5daac	398	unsigned int link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
1ce2de97	399
45d3a6ef SP	400	if (link) {
	401	print_string(PRINT_ANY, "link", "dev %s ",
	402	ll_index_to_name(link));
	403	}
1ce2de97 ND	404	}
1ce2de97 ND	405
375560c4 SP	406	if (tb[IFLA_IPTUN_TTL])
	407	ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]);
	408	if (is_json_context() \|\| ttl)
	409	print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
	410	else
2539a407	411	print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
1ce2de97	412
3caa526c SP	413	if (tb[IFLA_IPTUN_TOS])
	414	tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]);
	415	if (tos) {
	416	if (is_json_context() \|\| tos != 1)
	417	print_0xhex(PRINT_ANY, "tos", "tos 0x%x ", tos);
	418	else
	419	print_string(PRINT_FP, NULL, "tos %s ", "inherit");
1ce2de97 ND	420	}
	421
	422	if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC]))
2539a407	423	print_bool(PRINT_ANY, "pmtudisc", "pmtudisc ", true);
1ce2de97	424	else
2539a407	425	print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
1ce2de97 ND	426
1ce2de97 ND	427	if (tb[IFLA_IPTUN_FLAGS]) {
195f0f62	428	__u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]);
1ce2de97	429
195f0f62	430	if (iflags & SIT_ISATAP)
2539a407	431	print_bool(PRINT_ANY, "isatap", "isatap ", true);
1ce2de97 ND	432	}
	433
	434	if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
9f1370c0	435	(prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]))) {
1ce2de97 ND	436	__u16 relayprefixlen =
	437	rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
	438	__u32 relayprefix =
	439	rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]);
	440
2539a407 JF	441	const char *prefix = inet_ntop(AF_INET6,
2539a407 JF	442	RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
e97ad3d2	443	s2, sizeof(s2));
2539a407 JF	444
	445	if (is_json_context()) {
	446	print_string(PRINT_JSON, "prefix", NULL, prefix);
	447	print_int(PRINT_JSON, "prefixlen", NULL, prefixlen);
	448	if (relayprefix) {
	449	print_string(PRINT_JSON,
	450	"relay_prefix",
	451	NULL,
	452	format_host(AF_INET,
	453	4,
	454	&relayprefix));
	455	print_int(PRINT_JSON,
	456	"relay_prefixlen",
	457	NULL,
	458	relayprefixlen);
	459	}
	460	} else {
	461	printf("6rd-prefix %s/%u ", prefix, prefixlen);
	462	if (relayprefix) {
	463	printf("6rd-relay_prefix %s/%u ",
	464	format_host(AF_INET, 4, &relayprefix),
	465	relayprefixlen);
	466	}
1ce2de97 ND	467	}
1ce2de97 ND	468	}
c1159152	469
e97ad3d2 SP	470	if (tb[IFLA_IPTUN_FWMARK]) {
	471	__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
	472
	473	if (fwmark) {
	474	print_0xhex(PRINT_ANY,
	475	"fwmark", "fwmark 0x%x ", fwmark);
	476	}
	477	}
	478
bad76e6b SP	479	tnl_print_encap(tb,
	480	IFLA_IPTUN_ENCAP_TYPE,
	481	IFLA_IPTUN_ENCAP_FLAGS,
	482	IFLA_IPTUN_ENCAP_SPORT,
	483	IFLA_IPTUN_ENCAP_DPORT);
1ce2de97 ND	484	}
1ce2de97 ND	485
561e650e	486	static void iptunnel_print_help(struct link_util lu, int argc, char *argv,
	487	FILE *f)
	488	{
	489	print_usage(f, strcmp(lu->id, "sit") == 0);
	490	}
	491
1ce2de97 ND	492	struct link_util ipip_link_util = {
	493	.id = "ipip",
	494	.maxattr = IFLA_IPTUN_MAX,
	495	.parse_opt = iptunnel_parse_opt,
	496	.print_opt = iptunnel_print_opt,
561e650e	497	.print_help = iptunnel_print_help,
1ce2de97 ND	498	};
	499
	500	struct link_util sit_link_util = {
	501	.id = "sit",
	502	.maxattr = IFLA_IPTUN_MAX,
	503	.parse_opt = iptunnel_parse_opt,
	504	.print_opt = iptunnel_print_opt,
561e650e	505	.print_help = iptunnel_print_help,
1ce2de97	506	};