[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;

	if (strcmp(lu->id, "sit") == 0) {
		mode =	"{ ip6ip | ipip | mplsip | any } ]\n"
			"			[ isatap";
	} else {
		mode = "{ ipip | mplsip | any }";
	}

	fprintf(f,
		"Usage: ... %-6s	[ remote ADDR ]\n"
		"			[ 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"
		"			[ mode %s ]\n"
		"\n"
		"Where:	ADDR := { IP_ADDRESS | any }\n"
		"	TOS  := { NUMBER | inherit }\n"
		"	TTL  := { 1..255 | inherit }\n"
		"	MARK := { 0x0..0xffffffff }\n",
		lu->id, mode);
}

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 %#llx ", 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 %#llx ", 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	31
06e3975f	32	if (strcmp(lu->id, "sit") == 0) {
8589eb4e MC	33	mode = "{ ip6ip \| ipip \| mplsip \| any } ]\n"
8589eb4e MC	34	" [ isatap";
288c28bc	35	} else {
06e3975f	36	mode = "{ ipip \| mplsip \| any }";
77620be8	37	}
8589eb4e	38
06e3975f	39	fprintf(f,
8589eb4e MC	40	"Usage: ... %-6s [ remote ADDR ]\n"
	41	" [ local ADDR ]\n"
	42	" [ ttl TTL ]\n"
	43	" [ tos TOS ]\n"
	44	" [ [no]pmtudisc ]\n"
	45	" [ 6rd-prefix ADDR ]\n"
	46	" [ 6rd-relay_prefix ADDR ]\n"
	47	" [ 6rd-reset ]\n"
	48	" [ dev PHYS_DEV ]\n"
	49	" [ fwmark MARK ]\n"
	50	" [ external ]\n"
	51	" [ noencap ]\n"
	52	" [ encap { fou \| gue \| none } ]\n"
	53	" [ encap-sport PORT ]\n"
	54	" [ encap-dport PORT ]\n"
	55	" [ [no]encap-csum ]\n"
	56	" [ [no]encap-csum6 ]\n"
	57	" [ [no]encap-remcsum ]\n"
	58	" [ mode %s ]\n"
	59	"\n"
	60	"Where: ADDR := { IP_ADDRESS \| any }\n"
	61	" TOS := { NUMBER \| inherit }\n"
	62	" TTL := { 1..255 \| inherit }\n"
	63	" MARK := { 0x0..0xffffffff }\n",
	64	lu->id, mode);
1ce2de97 ND	65	}
	66
	67	static int iptunnel_parse_opt(struct link_util lu, int argc, char *argv,
	68	struct nlmsghdr *n)
	69	{
28254695	70	struct ifinfomsg *ifi = NLMSG_DATA(n);
1ce2de97 ND	71	struct {
	72	struct nlmsghdr n;
	73	struct ifinfomsg i;
d17b136f PS	74	} req = {
	75	.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
	76	.n.nlmsg_flags = NLM_F_REQUEST,
	77	.n.nlmsg_type = RTM_GETLINK,
	78	.i.ifi_family = preferred_family,
	79	.i.ifi_index = ifi->ifi_index,
	80	};
08ede25f	81	struct nlmsghdr *answer;
1ce2de97 ND	82	struct rtattr *tb[IFLA_MAX + 1];
	83	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
	84	struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1];
	85	int len;
7bda9fd3	86	inet_prefix saddr, daddr, ip6rdprefix, ip6rdrelayprefix;
1ce2de97	87	__u8 pmtudisc = 1;
5bd93795	88	__u8 tos = 0;
1ce2de97	89	__u16 iflags = 0;
5bd93795	90	__u8 ttl = 0;
5bd93795 SP	91	__u8 proto = 0;
5bd93795 SP	92	__u32 link = 0;
c1159152 TH	93	__u16 encaptype = 0;
	94	__u16 encapflags = 0;
	95	__u16 encapsport = 0;
	96	__u16 encapdport = 0;
4bfe6825	97	__u8 metadata = 0;
ad4b1425	98	__u32 fwmark = 0;
1ce2de97	99
7bda9fd3 SP	100	inet_prefix_reset(&saddr);
	101	inet_prefix_reset(&daddr);
	102
	103	inet_prefix_reset(&ip6rdprefix);
	104	inet_prefix_reset(&ip6rdrelayprefix);
	105
1ce2de97	106	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
7bda9fd3 SP	107	const struct rtattr *rta;
7bda9fd3 SP	108
86bf43c7	109	if (rtnl_talk(&rth, &req.n, &answer) < 0) {
1ce2de97 ND	110	get_failed:
	111	fprintf(stderr,
	112	"Failed to get existing tunnel info.\n");
	113	return -1;
	114	}
	115
86bf43c7	116	len = answer->nlmsg_len;
1ce2de97 ND	117	len -= NLMSG_LENGTH(sizeof(*ifi));
	118	if (len < 0)
	119	goto get_failed;
	120
86bf43c7	121	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
1ce2de97 ND	122
	123	if (!tb[IFLA_LINKINFO])
	124	goto get_failed;
	125
	126	parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
	127
	128	if (!linkinfo[IFLA_INFO_DATA])
	129	goto get_failed;
	130
	131	parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX,
	132	linkinfo[IFLA_INFO_DATA]);
	133
7bda9fd3 SP	134	rta = iptuninfo[IFLA_IPTUN_LOCAL];
	135	if (rta && get_addr_rta(&saddr, rta, AF_INET))
	136	goto get_failed;
	137
	138	rta = iptuninfo[IFLA_IPTUN_REMOTE];
	139	if (rta && get_addr_rta(&daddr, rta, AF_INET))
	140	goto get_failed;
	141
	142	rta = iptuninfo[IFLA_IPTUN_6RD_PREFIX];
	143	if (rta && get_addr_rta(&ip6rdprefix, rta, AF_INET6))
	144	goto get_failed;
	145
	146	rta = iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX];
	147	if (rta && get_addr_rta(&ip6rdrelayprefix, rta, AF_INET))
	148	goto get_failed;
	149
	150	rta = iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN];
	151	ip6rdprefix.bitlen = rta ? rta_getattr_u16(rta) : 0;
1ce2de97	152
7bda9fd3 SP	153	rta = iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN];
7bda9fd3 SP	154	ip6rdrelayprefix.bitlen = rta ? rta_getattr_u16(rta) : 0;
1ce2de97 ND	155
	156	if (iptuninfo[IFLA_IPTUN_TTL])
	157	ttl = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]);
	158
1ce2de97 ND	159	if (iptuninfo[IFLA_IPTUN_PMTUDISC])
	160	pmtudisc =
	161	rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]);
	162
5bd93795 SP	163	if (iptuninfo[IFLA_IPTUN_TOS])
	164	tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]);
	165
1ce2de97 ND	166	if (iptuninfo[IFLA_IPTUN_FLAGS])
	167	iflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_FLAGS]);
	168
	169	if (iptuninfo[IFLA_IPTUN_LINK])
	170	link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]);
	171
77620be8 ND	172	if (iptuninfo[IFLA_IPTUN_PROTO])
	173	proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]);
	174
c1159152 TH	175	if (iptuninfo[IFLA_IPTUN_ENCAP_TYPE])
	176	encaptype = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_TYPE]);
	177	if (iptuninfo[IFLA_IPTUN_ENCAP_FLAGS])
	178	encapflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]);
	179	if (iptuninfo[IFLA_IPTUN_ENCAP_SPORT])
	180	encapsport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_SPORT]);
	181	if (iptuninfo[IFLA_IPTUN_ENCAP_DPORT])
	182	encapdport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_DPORT]);
7bda9fd3	183
4bfe6825 AS	184	if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA])
4bfe6825 AS	185	metadata = 1;
ad4b1425 CG	186
	187	if (iptuninfo[IFLA_IPTUN_FWMARK])
	188	fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]);
	189
86bf43c7	190	free(answer);
1ce2de97 ND	191	}
	192
	193	while (argc > 0) {
5bd93795 SP	194	if (strcmp(*argv, "mode") == 0) {
	195	NEXT_ARG();
	196	if (strcmp(lu->id, "sit") == 0 &&
	197	(strcmp(*argv, "ipv6/ipv4") == 0 \|\|
	198	strcmp(*argv, "ip6ip") == 0))
	199	proto = IPPROTO_IPV6;
	200	else if (strcmp(*argv, "ipv4/ipv4") == 0 \|\|
	201	strcmp(*argv, "ipip") == 0 \|\|
	202	strcmp(*argv, "ip4ip4") == 0)
	203	proto = IPPROTO_IPIP;
	204	else if (strcmp(*argv, "mpls/ipv4") == 0 \|\|
	205	strcmp(*argv, "mplsip") == 0)
	206	proto = IPPROTO_MPLS;
	207	else if (strcmp(*argv, "any/ipv4") == 0 \|\|
	208	strcmp(*argv, "any") == 0)
	209	proto = 0;
	210	else
	211	invarg("Cannot guess tunnel mode.", *argv);
	212	} else if (strcmp(*argv, "remote") == 0) {
1ce2de97	213	NEXT_ARG();
7bda9fd3	214	get_addr(&daddr, *argv, AF_INET);
1ce2de97 ND	215	} else if (strcmp(*argv, "local") == 0) {
1ce2de97 ND	216	NEXT_ARG();
7bda9fd3	217	get_addr(&saddr, *argv, AF_INET);
1ce2de97 ND	218	} else if (matches(*argv, "dev") == 0) {
1ce2de97 ND	219	NEXT_ARG();
7a14358b	220	link = ll_name_to_index(*argv);
fe99adbc SP	221	if (!link)
fe99adbc SP	222	exit(nodev(*argv));
1ce2de97	223	} else if (strcmp(*argv, "ttl") == 0 \|\|
c4743c4d SP	224	strcmp(*argv, "hoplimit") == 0 \|\|
c4743c4d SP	225	strcmp(*argv, "hlim") == 0) {
1ce2de97 ND	226	NEXT_ARG();
	227	if (strcmp(*argv, "inherit") != 0) {
	228	if (get_u8(&ttl, *argv, 0))
	229	invarg("invalid TTL\n", *argv);
	230	} else
	231	ttl = 0;
	232	} else if (strcmp(*argv, "tos") == 0 \|\|
	233	strcmp(*argv, "tclass") == 0 \|\|
5bd93795	234	strcmp(*argv, "tc") == 0 \|\|
1ce2de97 ND	235	matches(*argv, "dsfield") == 0) {
1ce2de97 ND	236	__u32 uval;
56f5daac	237
1ce2de97 ND	238	NEXT_ARG();
	239	if (strcmp(*argv, "inherit") != 0) {
	240	if (rtnl_dsfield_a2n(&uval, *argv))
	241	invarg("bad TOS value", *argv);
	242	tos = uval;
	243	} else
	244	tos = 1;
	245	} else if (strcmp(*argv, "nopmtudisc") == 0) {
	246	pmtudisc = 0;
	247	} else if (strcmp(*argv, "pmtudisc") == 0) {
	248	pmtudisc = 1;
	249	} else if (strcmp(lu->id, "sit") == 0 &&
	250	strcmp(*argv, "isatap") == 0) {
	251	iflags \|= SIT_ISATAP;
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	288	} else if (strcmp(*argv, "6rd-prefix") == 0) {
1ce2de97	289	NEXT_ARG();
7bda9fd3	290	if (get_prefix(&ip6rdprefix, *argv, AF_INET6))
1ce2de97	291	invarg("invalid 6rd_prefix\n", *argv);
1ce2de97	292	} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
1ce2de97	293	NEXT_ARG();
7bda9fd3	294	if (get_prefix(&ip6rdrelayprefix, *argv, AF_INET))
1ce2de97	295	invarg("invalid 6rd-relay_prefix\n", *argv);
1ce2de97	296	} else if (strcmp(*argv, "6rd-reset") == 0) {
7bda9fd3 SP	297	get_prefix(&ip6rdprefix, "2002::/16", AF_INET6);
7bda9fd3 SP	298	inet_prefix_reset(&ip6rdrelayprefix);
ad4b1425 CG	299	} else if (strcmp(*argv, "fwmark") == 0) {
	300	NEXT_ARG();
	301	if (get_u32(&fwmark, *argv, 0))
	302	invarg("invalid fwmark\n", *argv);
06e3975f SP	303	} else {
	304	iptunnel_print_help(lu, argc, argv, stderr);
	305	return -1;
	306	}
1ce2de97 ND	307	argc--, argv++;
	308	}
	309
	310	if (ttl && pmtudisc == 0) {
30d07e9e	311	fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
1ce2de97 ND	312	exit(-1);
	313	}
	314
68a7f5ed	315	addattr8(n, 1024, IFLA_IPTUN_PROTO, proto);
4bfe6825 AS	316	if (metadata) {
	317	addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0);
	318	return 0;
	319	}
	320
fa1e658e	321	if (is_addrtype_inet_not_unspec(&saddr)) {
7bda9fd3 SP	322	addattr_l(n, 1024, IFLA_IPTUN_LOCAL,
	323	saddr.data, saddr.bytelen);
	324	}
fa1e658e	325	if (is_addrtype_inet_not_unspec(&daddr)) {
7bda9fd3 SP	326	addattr_l(n, 1024, IFLA_IPTUN_REMOTE,
	327	daddr.data, daddr.bytelen);
	328	}
1ce2de97	329	addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc);
5bd93795 SP	330	addattr8(n, 1024, IFLA_IPTUN_TOS, tos);
	331	addattr8(n, 1024, IFLA_IPTUN_TTL, ttl);
	332	addattr32(n, 1024, IFLA_IPTUN_LINK, link);
ad4b1425	333	addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark);
c1159152 TH	334
	335	addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype);
	336	addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags);
	337	addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport));
	338	addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport));
	339
1ce2de97 ND	340	if (strcmp(lu->id, "sit") == 0) {
1ce2de97 ND	341	addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags);
7bda9fd3	342	if (is_addrtype_inet(&ip6rdprefix)) {
1ce2de97	343	addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX,
7bda9fd3	344	ip6rdprefix.data, ip6rdprefix.bytelen);
1ce2de97	345	addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN,
7bda9fd3 SP	346	ip6rdprefix.bitlen);
	347	}
	348	if (is_addrtype_inet(&ip6rdrelayprefix)) {
1ce2de97	349	addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX,
7bda9fd3	350	ip6rdrelayprefix.data[0]);
1ce2de97	351	addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
7bda9fd3	352	ip6rdrelayprefix.bitlen);
1ce2de97 ND	353	}
	354	}
	355
	356	return 0;
	357	}
	358
	359	static void iptunnel_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	360	{
1ce2de97	361	char s2[64];
bad76e6b	362	__u16 prefixlen;
375560c4	363	__u8 ttl = 0;
3caa526c	364	__u8 tos = 0;
1ce2de97 ND	365
	366	if (!tb)
	367	return;
	368
00ff4b8e	369	if (tb[IFLA_IPTUN_COLLECT_METADATA]) {
d6abae5a	370	print_bool(PRINT_ANY, "external", "external ", true);
00ff4b8e SP	371	return;
00ff4b8e SP	372	}
7b178324	373
d9aefbc0 SP	374	if (tb[IFLA_IPTUN_PROTO]) {
	375	switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) {
	376	case IPPROTO_IPIP:
	377	print_string(PRINT_ANY, "proto", "%s ", "ipip");
	378	break;
	379	case IPPROTO_IPV6:
	380	print_string(PRINT_ANY, "proto", "%s ", "ip6ip");
	381	break;
	382	case IPPROTO_MPLS:
	383	print_string(PRINT_ANY, "proto", "%s ", "mplsip");
	384	break;
	385	case 0:
	386	print_string(PRINT_ANY, "proto", "%s ", "any");
	387	break;
	388	}
	389	}
	390
b761fc41 SP	391	tnl_print_endpoint("remote", tb[IFLA_IPTUN_REMOTE], AF_INET);
b761fc41 SP	392	tnl_print_endpoint("local", tb[IFLA_IPTUN_LOCAL], AF_INET);
1ce2de97	393
45d3a6ef	394	if (tb[IFLA_IPTUN_LINK]) {
5bd93795	395	__u32 link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]);
1ce2de97	396
45d3a6ef SP	397	if (link) {
	398	print_string(PRINT_ANY, "link", "dev %s ",
	399	ll_index_to_name(link));
	400	}
1ce2de97 ND	401	}
1ce2de97 ND	402
375560c4 SP	403	if (tb[IFLA_IPTUN_TTL])
	404	ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]);
	405	if (is_json_context() \|\| ttl)
	406	print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl);
	407	else
2539a407	408	print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
1ce2de97	409
3caa526c SP	410	if (tb[IFLA_IPTUN_TOS])
	411	tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]);
	412	if (tos) {
	413	if (is_json_context() \|\| tos != 1)
90c5c969	414	print_0xhex(PRINT_ANY, "tos", "tos %#llx ", tos);
3caa526c SP	415	else
3caa526c SP	416	print_string(PRINT_FP, NULL, "tos %s ", "inherit");
1ce2de97 ND	417	}
	418
	419	if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC]))
2539a407	420	print_bool(PRINT_ANY, "pmtudisc", "pmtudisc ", true);
1ce2de97	421	else
2539a407	422	print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
1ce2de97 ND	423
1ce2de97 ND	424	if (tb[IFLA_IPTUN_FLAGS]) {
195f0f62	425	__u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]);
1ce2de97	426
195f0f62	427	if (iflags & SIT_ISATAP)
2539a407	428	print_bool(PRINT_ANY, "isatap", "isatap ", true);
1ce2de97 ND	429	}
	430
	431	if (tb[IFLA_IPTUN_6RD_PREFIXLEN] &&
9f1370c0	432	(prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]))) {
1ce2de97 ND	433	__u16 relayprefixlen =
	434	rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
	435	__u32 relayprefix =
	436	rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]);
	437
2539a407 JF	438	const char *prefix = inet_ntop(AF_INET6,
2539a407 JF	439	RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]),
e97ad3d2	440	s2, sizeof(s2));
2539a407 JF	441
	442	if (is_json_context()) {
	443	print_string(PRINT_JSON, "prefix", NULL, prefix);
	444	print_int(PRINT_JSON, "prefixlen", NULL, prefixlen);
	445	if (relayprefix) {
	446	print_string(PRINT_JSON,
	447	"relay_prefix",
	448	NULL,
	449	format_host(AF_INET,
	450	4,
	451	&relayprefix));
	452	print_int(PRINT_JSON,
	453	"relay_prefixlen",
	454	NULL,
	455	relayprefixlen);
	456	}
	457	} else {
	458	printf("6rd-prefix %s/%u ", prefix, prefixlen);
	459	if (relayprefix) {
	460	printf("6rd-relay_prefix %s/%u ",
	461	format_host(AF_INET, 4, &relayprefix),
	462	relayprefixlen);
	463	}
1ce2de97 ND	464	}
1ce2de97 ND	465	}
c1159152	466
e97ad3d2 SP	467	if (tb[IFLA_IPTUN_FWMARK]) {
	468	__u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]);
	469
	470	if (fwmark) {
	471	print_0xhex(PRINT_ANY,
90c5c969	472	"fwmark", "fwmark %#llx ", fwmark);
e97ad3d2 SP	473	}
	474	}
	475
bad76e6b SP	476	tnl_print_encap(tb,
	477	IFLA_IPTUN_ENCAP_TYPE,
	478	IFLA_IPTUN_ENCAP_FLAGS,
	479	IFLA_IPTUN_ENCAP_SPORT,
	480	IFLA_IPTUN_ENCAP_DPORT);
1ce2de97 ND	481	}
	482
	483	struct link_util ipip_link_util = {
	484	.id = "ipip",
	485	.maxattr = IFLA_IPTUN_MAX,
	486	.parse_opt = iptunnel_parse_opt,
	487	.print_opt = iptunnel_print_opt,
561e650e	488	.print_help = iptunnel_print_help,
1ce2de97 ND	489	};
	490
	491	struct link_util sit_link_util = {
	492	.id = "sit",
	493	.maxattr = IFLA_IPTUN_MAX,
	494	.parse_opt = iptunnel_parse_opt,
	495	.print_opt = iptunnel_print_opt,
561e650e	496	.print_help = iptunnel_print_help,
1ce2de97	497	};