[mirror_iproute2.git] / ip / link_gre.c

/*
 * link_gre.c	gre 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:	Herbert Xu <herbert@gondor.apana.org.au>
 *
 */

#include <string.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

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

static void usage(void) __attribute__((noreturn));
static void usage(void)
{
	fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n");
	fprintf(stderr, "          type { gre | gretap } [ remote ADDR ] [ local ADDR ]\n");
	fprintf(stderr, "          [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
	fprintf(stderr, "          [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "Where: NAME := STRING\n");
	fprintf(stderr, "       ADDR := { IP_ADDRESS | any }\n");
	fprintf(stderr, "       TOS  := { NUMBER | inherit }\n");
	fprintf(stderr, "       TTL  := { 1..255 | inherit }\n");
	fprintf(stderr, "       KEY  := { DOTTED_QUAD | NUMBER }\n");
	exit(-1);
}

static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
			 struct nlmsghdr *n)
{
	struct {
		struct nlmsghdr n;
		struct ifinfomsg i;
		char buf[1024];
	} req;
	struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
	struct rtattr *tb[IFLA_MAX + 1];
	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
	struct rtattr *greinfo[IFLA_GRE_MAX + 1];
	__u16 iflags = 0;
	__u16 oflags = 0;
	unsigned ikey = 0;
	unsigned okey = 0;
	unsigned saddr = 0;
	unsigned daddr = 0;
	unsigned link = 0;
	__u8 pmtudisc = 1;
	__u8 ttl = 0;
	__u8 tos = 0;
	int len;

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

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

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

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

		parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);

		if (!tb[IFLA_LINKINFO])
			goto get_failed;

		parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);

		if (!linkinfo[IFLA_INFO_DATA])
			goto get_failed;

		parse_rtattr_nested(greinfo, IFLA_GRE_MAX,
				    linkinfo[IFLA_INFO_DATA]);

		if (greinfo[IFLA_GRE_IKEY])
			ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]);

		if (greinfo[IFLA_GRE_OKEY])
			okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]);

		if (greinfo[IFLA_GRE_IFLAGS])
			iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]);

		if (greinfo[IFLA_GRE_OFLAGS])
			oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]);

		if (greinfo[IFLA_GRE_LOCAL])
			saddr = rta_getattr_u32(greinfo[IFLA_GRE_LOCAL]);

		if (greinfo[IFLA_GRE_REMOTE])
			daddr = rta_getattr_u32(greinfo[IFLA_GRE_REMOTE]);

		if (greinfo[IFLA_GRE_PMTUDISC])
			pmtudisc = rta_getattr_u8(
				greinfo[IFLA_GRE_PMTUDISC]);

		if (greinfo[IFLA_GRE_TTL])
			ttl = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);

		if (greinfo[IFLA_GRE_TOS])
			tos = rta_getattr_u8(greinfo[IFLA_GRE_TOS]);

		if (greinfo[IFLA_GRE_LINK])
			link = rta_getattr_u8(greinfo[IFLA_GRE_LINK]);
	}

	while (argc > 0) {
		if (!matches(*argv, "key")) {
			unsigned uval;

			NEXT_ARG();
			iflags |= GRE_KEY;
			oflags |= GRE_KEY;
			if (strchr(*argv, '.'))
				uval = get_addr32(*argv);
			else {
				if (get_unsigned(&uval, *argv, 0) < 0) {
					fprintf(stderr,
						"Invalid value for \"key\": \"%s\"; it should be an unsigned integer\n", *argv);
					exit(-1);
				}
				uval = htonl(uval);
			}

			ikey = okey = uval;
		} else if (!matches(*argv, "ikey")) {
			unsigned uval;

			NEXT_ARG();
			iflags |= GRE_KEY;
			if (strchr(*argv, '.'))
				uval = get_addr32(*argv);
			else {
				if (get_unsigned(&uval, *argv, 0)<0) {
					fprintf(stderr, "invalid value for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv);
					exit(-1);
				}
				uval = htonl(uval);
			}
			ikey = uval;
		} else if (!matches(*argv, "okey")) {
			unsigned uval;

			NEXT_ARG();
			oflags |= GRE_KEY;
			if (strchr(*argv, '.'))
				uval = get_addr32(*argv);
			else {
				if (get_unsigned(&uval, *argv, 0)<0) {
					fprintf(stderr, "invalid value for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv);
					exit(-1);
				}
				uval = htonl(uval);
			}
			okey = uval;
		} else if (!matches(*argv, "seq")) {
			iflags |= GRE_SEQ;
			oflags |= GRE_SEQ;
		} else if (!matches(*argv, "iseq")) {
			iflags |= GRE_SEQ;
		} else if (!matches(*argv, "oseq")) {
			oflags |= GRE_SEQ;
		} else if (!matches(*argv, "csum")) {
			iflags |= GRE_CSUM;
			oflags |= GRE_CSUM;
		} else if (!matches(*argv, "icsum")) {
			iflags |= GRE_CSUM;
		} else if (!matches(*argv, "ocsum")) {
			oflags |= GRE_CSUM;
		} else if (!matches(*argv, "nopmtudisc")) {
			pmtudisc = 0;
		} else if (!matches(*argv, "pmtudisc")) {
			pmtudisc = 1;
		} else if (!matches(*argv, "remote")) {
			NEXT_ARG();
			if (strcmp(*argv, "any"))
				daddr = get_addr32(*argv);
		} else if (!matches(*argv, "local")) {
			NEXT_ARG();
			if (strcmp(*argv, "any"))
				saddr = get_addr32(*argv);
		} else if (!matches(*argv, "dev")) {
			NEXT_ARG();
			link = if_nametoindex(*argv);
			if (link == 0) {
				fprintf(stderr, "Cannot find device \"%s\"\n",
					*argv);
				exit(-1);
			}
		} else if (!matches(*argv, "ttl") ||
			   !matches(*argv, "hoplimit")) {
			unsigned uval;

			NEXT_ARG();
			if (strcmp(*argv, "inherit") != 0) {
				if (get_unsigned(&uval, *argv, 0))
					invarg("invalid TTL\n", *argv);
				if (uval > 255)
					invarg("TTL must be <= 255\n", *argv);
				ttl = uval;
			}
		} else if (!matches(*argv, "tos") ||
			   !matches(*argv, "tclass") ||
			   !matches(*argv, "dsfield")) {
			__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
			usage();
		argc--; argv++;
	}

	if (!ikey && IN_MULTICAST(ntohl(daddr))) {
		ikey = daddr;
		iflags |= GRE_KEY;
	}
	if (!okey && IN_MULTICAST(ntohl(daddr))) {
		okey = daddr;
		oflags |= GRE_KEY;
	}
	if (IN_MULTICAST(ntohl(daddr)) && !saddr) {
		fprintf(stderr, "A broadcast tunnel requires a source address.\n");
		return -1;
	}

	addattr32(n, 1024, IFLA_GRE_IKEY, ikey);
	addattr32(n, 1024, IFLA_GRE_OKEY, okey);
	addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2);
	addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2);
	addattr_l(n, 1024, IFLA_GRE_LOCAL, &saddr, 4);
	addattr_l(n, 1024, IFLA_GRE_REMOTE, &daddr, 4);
	addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
	if (link)
		addattr32(n, 1024, IFLA_GRE_LINK, link);
	addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
	addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1);

	return 0;
}

static void gre_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";
	unsigned iflags = 0;
	unsigned oflags = 0;

	if (!tb)
		return;

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

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

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

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

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

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

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

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

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

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

		fputs("tos ", f);
		if (tos == 1)
			fputs("inherit ", f);
		else
			fprintf(f, "0x%x ", tos);
	}

	if (tb[IFLA_GRE_PMTUDISC] &&
	    !rta_getattr_u8(tb[IFLA_GRE_PMTUDISC]))
		fputs("nopmtudisc ", f);

	if (tb[IFLA_GRE_IFLAGS])
		iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]);

	if (tb[IFLA_GRE_OFLAGS])
		oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]);

	if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) {
		inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
		fprintf(f, "ikey %s ", s2);
	}

	if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) {
		inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
		fprintf(f, "okey %s ", s2);
	}

	if (iflags & GRE_SEQ)
		fputs("iseq ", f);
	if (oflags & GRE_SEQ)
		fputs("oseq ", f);
	if (iflags & GRE_CSUM)
		fputs("icsum ", f);
	if (oflags & GRE_CSUM)
		fputs("ocsum ", f);
}

struct link_util gre_link_util = {
	.id = "gre",
	.maxattr = IFLA_GRE_MAX,
	.parse_opt = gre_parse_opt,
	.print_opt = gre_print_opt,
};

struct link_util gretap_link_util = {
	.id = "gretap",
	.maxattr = IFLA_GRE_MAX,
	.parse_opt = gre_parse_opt,
	.print_opt = gre_print_opt,
};
Commit	Line	Data
237d9e82 HX	1	/*
	2	* link_gre.c gre 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: Herbert Xu <herbert@gondor.apana.org.au>
	10	*
	11	*/
	12
	13	#include <string.h>
	14	#include <net/if.h>
237d9e82 HX	15	#include <sys/types.h>
	16	#include <sys/socket.h>
	17	#include <arpa/inet.h>
	18
1957a322 SH	19	#include <linux/ip.h>
1957a322 SH	20	#include <linux/if_tunnel.h>
237d9e82 HX	21	#include "rt_names.h"
	22	#include "utils.h"
	23	#include "ip_common.h"
	24	#include "tunnel.h"
	25
	26	static void usage(void) __attribute__((noreturn));
	27	static void usage(void)
	28	{
	29	fprintf(stderr, "Usage: ip link { add \| set \| change \| replace \| del } NAME\n");
	30	fprintf(stderr, " type { gre \| gretap } [ remote ADDR ] [ local ADDR ]\n");
	31	fprintf(stderr, " [ [i\|o]seq ] [ [i\|o]key KEY ] [ [i\|o]csum ]\n");
	32	fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
	33	fprintf(stderr, "\n");
	34	fprintf(stderr, "Where: NAME := STRING\n");
	35	fprintf(stderr, " ADDR := { IP_ADDRESS \| any }\n");
	36	fprintf(stderr, " TOS := { NUMBER \| inherit }\n");
	37	fprintf(stderr, " TTL := { 1..255 \| inherit }\n");
	38	fprintf(stderr, " KEY := { DOTTED_QUAD \| NUMBER }\n");
	39	exit(-1);
	40	}
	41
	42	static int gre_parse_opt(struct link_util lu, int argc, char *argv,
	43	struct nlmsghdr *n)
	44	{
72c771b2 HX	45	struct {
	46	struct nlmsghdr n;
	47	struct ifinfomsg i;
	48	char buf[1024];
	49	} req;
	50	struct ifinfomsg ifi = (struct ifinfomsg )(n + 1);
	51	struct rtattr *tb[IFLA_MAX + 1];
	52	struct rtattr *linkinfo[IFLA_INFO_MAX+1];
	53	struct rtattr *greinfo[IFLA_GRE_MAX + 1];
237d9e82 HX	54	__u16 iflags = 0;
	55	__u16 oflags = 0;
	56	unsigned ikey = 0;
	57	unsigned okey = 0;
	58	unsigned saddr = 0;
	59	unsigned daddr = 0;
72c771b2 HX	60	unsigned link = 0;
	61	__u8 pmtudisc = 1;
	62	__u8 ttl = 0;
	63	__u8 tos = 0;
	64	int len;
	65
	66	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
	67	memset(&req, 0, sizeof(req));
	68
	69	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
	70	req.n.nlmsg_flags = NLM_F_REQUEST;
	71	req.n.nlmsg_type = RTM_GETLINK;
	72	req.i.ifi_family = preferred_family;
	73	req.i.ifi_index = ifi->ifi_index;
	74
cd70f3f5	75	if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0) {
72c771b2 HX	76	get_failed:
	77	fprintf(stderr,
	78	"Failed to get existing tunnel info.\n");
	79	return -1;
	80	}
	81
	82	len = req.n.nlmsg_len;
	83	len -= NLMSG_LENGTH(sizeof(*ifi));
	84	if (len < 0)
	85	goto get_failed;
	86
	87	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);
	88
	89	if (!tb[IFLA_LINKINFO])
	90	goto get_failed;
	91
	92	parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
	93
	94	if (!linkinfo[IFLA_INFO_DATA])
	95	goto get_failed;
	96
	97	parse_rtattr_nested(greinfo, IFLA_GRE_MAX,
	98	linkinfo[IFLA_INFO_DATA]);
	99
	100	if (greinfo[IFLA_GRE_IKEY])
ff24746c	101	ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]);
72c771b2 HX	102
72c771b2 HX	103	if (greinfo[IFLA_GRE_OKEY])
ff24746c	104	okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]);
72c771b2 HX	105
72c771b2 HX	106	if (greinfo[IFLA_GRE_IFLAGS])
ff24746c	107	iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]);
72c771b2 HX	108
72c771b2 HX	109	if (greinfo[IFLA_GRE_OFLAGS])
ff24746c	110	oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]);
72c771b2 HX	111
72c771b2 HX	112	if (greinfo[IFLA_GRE_LOCAL])
ff24746c	113	saddr = rta_getattr_u32(greinfo[IFLA_GRE_LOCAL]);
72c771b2 HX	114
72c771b2 HX	115	if (greinfo[IFLA_GRE_REMOTE])
ff24746c	116	daddr = rta_getattr_u32(greinfo[IFLA_GRE_REMOTE]);
72c771b2 HX	117
72c771b2 HX	118	if (greinfo[IFLA_GRE_PMTUDISC])
ff24746c	119	pmtudisc = rta_getattr_u8(
72c771b2 HX	120	greinfo[IFLA_GRE_PMTUDISC]);
	121
	122	if (greinfo[IFLA_GRE_TTL])
ff24746c	123	ttl = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);
72c771b2 HX	124
72c771b2 HX	125	if (greinfo[IFLA_GRE_TOS])
ff24746c	126	tos = rta_getattr_u8(greinfo[IFLA_GRE_TOS]);
72c771b2 HX	127
72c771b2 HX	128	if (greinfo[IFLA_GRE_LINK])
ff24746c	129	link = rta_getattr_u8(greinfo[IFLA_GRE_LINK]);
72c771b2	130	}
237d9e82 HX	131
	132	while (argc > 0) {
	133	if (!matches(*argv, "key")) {
	134	unsigned uval;
	135
	136	NEXT_ARG();
	137	iflags \|= GRE_KEY;
	138	oflags \|= GRE_KEY;
	139	if (strchr(*argv, '.'))
	140	uval = get_addr32(*argv);
	141	else {
	142	if (get_unsigned(&uval, *argv, 0) < 0) {
	143	fprintf(stderr,
14645ec2	144	"Invalid value for \"key\": \"%s\"; it should be an unsigned integer\n", *argv);
237d9e82 HX	145	exit(-1);
	146	}
	147	uval = htonl(uval);
	148	}
	149
	150	ikey = okey = uval;
	151	} else if (!matches(*argv, "ikey")) {
	152	unsigned uval;
	153
	154	NEXT_ARG();
	155	iflags \|= GRE_KEY;
	156	if (strchr(*argv, '.'))
	157	uval = get_addr32(*argv);
	158	else {
	159	if (get_unsigned(&uval, *argv, 0)<0) {
14645ec2	160	fprintf(stderr, "invalid value for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv);
237d9e82 HX	161	exit(-1);
	162	}
	163	uval = htonl(uval);
	164	}
	165	ikey = uval;
	166	} else if (!matches(*argv, "okey")) {
	167	unsigned uval;
	168
	169	NEXT_ARG();
	170	oflags \|= GRE_KEY;
	171	if (strchr(*argv, '.'))
	172	uval = get_addr32(*argv);
	173	else {
	174	if (get_unsigned(&uval, *argv, 0)<0) {
14645ec2	175	fprintf(stderr, "invalid value for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv);
237d9e82 HX	176	exit(-1);
	177	}
	178	uval = htonl(uval);
	179	}
	180	okey = uval;
	181	} else if (!matches(*argv, "seq")) {
	182	iflags \|= GRE_SEQ;
	183	oflags \|= GRE_SEQ;
	184	} else if (!matches(*argv, "iseq")) {
	185	iflags \|= GRE_SEQ;
	186	} else if (!matches(*argv, "oseq")) {
	187	oflags \|= GRE_SEQ;
	188	} else if (!matches(*argv, "csum")) {
	189	iflags \|= GRE_CSUM;
	190	oflags \|= GRE_CSUM;
	191	} else if (!matches(*argv, "icsum")) {
	192	iflags \|= GRE_CSUM;
	193	} else if (!matches(*argv, "ocsum")) {
	194	oflags \|= GRE_CSUM;
	195	} else if (!matches(*argv, "nopmtudisc")) {
72c771b2	196	pmtudisc = 0;
237d9e82	197	} else if (!matches(*argv, "pmtudisc")) {
72c771b2	198	pmtudisc = 1;
237d9e82 HX	199	} else if (!matches(*argv, "remote")) {
	200	NEXT_ARG();
	201	if (strcmp(*argv, "any"))
	202	daddr = get_addr32(*argv);
	203	} else if (!matches(*argv, "local")) {
	204	NEXT_ARG();
	205	if (strcmp(*argv, "any"))
	206	saddr = get_addr32(*argv);
	207	} else if (!matches(*argv, "dev")) {
237d9e82	208	NEXT_ARG();
ea71beac	209	link = if_nametoindex(*argv);
0cb6bb51 CW	210	if (link == 0) {
	211	fprintf(stderr, "Cannot find device \"%s\"\n",
	212	*argv);
237d9e82	213	exit(-1);
0cb6bb51	214	}
237d9e82 HX	215	} else if (!matches(*argv, "ttl") \|\|
	216	!matches(*argv, "hoplimit")) {
	217	unsigned uval;
237d9e82 HX	218
	219	NEXT_ARG();
	220	if (strcmp(*argv, "inherit") != 0) {
	221	if (get_unsigned(&uval, *argv, 0))
	222	invarg("invalid TTL\n", *argv);
	223	if (uval > 255)
	224	invarg("TTL must be <= 255\n", *argv);
	225	ttl = uval;
237d9e82 HX	226	}
	227	} else if (!matches(*argv, "tos") \|\|
	228	!matches(*argv, "tclass") \|\|
	229	!matches(*argv, "dsfield")) {
	230	__u32 uval;
237d9e82 HX	231
	232	NEXT_ARG();
	233	if (strcmp(*argv, "inherit") != 0) {
	234	if (rtnl_dsfield_a2n(&uval, *argv))
	235	invarg("bad TOS value", *argv);
	236	tos = uval;
	237	} else
	238	tos = 1;
0612519e	239	} else
237d9e82 HX	240	usage();
	241	argc--; argv++;
	242	}
	243
	244	if (!ikey && IN_MULTICAST(ntohl(daddr))) {
	245	ikey = daddr;
	246	iflags \|= GRE_KEY;
	247	}
	248	if (!okey && IN_MULTICAST(ntohl(daddr))) {
	249	okey = daddr;
	250	oflags \|= GRE_KEY;
	251	}
	252	if (IN_MULTICAST(ntohl(daddr)) && !saddr) {
14645ec2	253	fprintf(stderr, "A broadcast tunnel requires a source address.\n");
237d9e82 HX	254	return -1;
	255	}
	256
	257	addattr32(n, 1024, IFLA_GRE_IKEY, ikey);
	258	addattr32(n, 1024, IFLA_GRE_OKEY, okey);
	259	addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2);
	260	addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2);
	261	addattr_l(n, 1024, IFLA_GRE_LOCAL, &saddr, 4);
	262	addattr_l(n, 1024, IFLA_GRE_REMOTE, &daddr, 4);
72c771b2 HX	263	addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
	264	if (link)
	265	addattr32(n, 1024, IFLA_GRE_LINK, link);
	266	addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
	267	addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1);
237d9e82 HX	268
	269	return 0;
	270	}
	271
	272	static void gre_print_opt(struct link_util lu, FILE f, struct rtattr *tb[])
	273	{
	274	char s1[1024];
	275	char s2[64];
	276	const char *local = "any";
	277	const char *remote = "any";
	278	unsigned iflags = 0;
	279	unsigned oflags = 0;
	280
	281	if (!tb)
	282	return;
	283
	284	if (tb[IFLA_GRE_REMOTE]) {
ff24746c	285	unsigned addr = rta_getattr_u32(tb[IFLA_GRE_REMOTE]);
237d9e82 HX	286
	287	if (addr)
	288	remote = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
	289	}
	290
	291	fprintf(f, "remote %s ", remote);
	292
	293	if (tb[IFLA_GRE_LOCAL]) {
ff24746c	294	unsigned addr = rta_getattr_u32(tb[IFLA_GRE_LOCAL]);
237d9e82 HX	295
	296	if (addr)
	297	local = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
	298	}
	299
	300	fprintf(f, "local %s ", local);
	301
ff24746c SH	302	if (tb[IFLA_GRE_LINK] && rta_getattr_u32(tb[IFLA_GRE_LINK])) {
ff24746c SH	303	unsigned link = rta_getattr_u32(tb[IFLA_GRE_LINK]);
ea71beac	304	const char *n = if_indextoname(link, s2);
237d9e82 HX	305
	306	if (n)
	307	fprintf(f, "dev %s ", n);
	308	else
	309	fprintf(f, "dev %u ", link);
	310	}
	311
ff24746c SH	312	if (tb[IFLA_GRE_TTL] && rta_getattr_u8(tb[IFLA_GRE_TTL]))
ff24746c SH	313	fprintf(f, "ttl %d ", rta_getattr_u8(tb[IFLA_GRE_TTL]));
237d9e82 HX	314	else
	315	fprintf(f, "ttl inherit ");
	316
ff24746c SH	317	if (tb[IFLA_GRE_TOS] && rta_getattr_u8(tb[IFLA_GRE_TOS])) {
ff24746c SH	318	int tos = rta_getattr_u8(tb[IFLA_GRE_TOS]);
237d9e82 HX	319
	320	fputs("tos ", f);
	321	if (tos == 1)
	322	fputs("inherit ", f);
	323	else
	324	fprintf(f, "0x%x ", tos);
	325	}
	326
	327	if (tb[IFLA_GRE_PMTUDISC] &&
ff24746c	328	!rta_getattr_u8(tb[IFLA_GRE_PMTUDISC]))
237d9e82 HX	329	fputs("nopmtudisc ", f);
	330
	331	if (tb[IFLA_GRE_IFLAGS])
ff24746c	332	iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]);
237d9e82 HX	333
237d9e82 HX	334	if (tb[IFLA_GRE_OFLAGS])
ff24746c	335	oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]);
237d9e82	336
71816553	337	if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) {
237d9e82 HX	338	inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
	339	fprintf(f, "ikey %s ", s2);
	340	}
	341
71816553	342	if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) {
237d9e82	343	inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
71816553	344	fprintf(f, "okey %s ", s2);
237d9e82 HX	345	}
	346
	347	if (iflags & GRE_SEQ)
	348	fputs("iseq ", f);
	349	if (oflags & GRE_SEQ)
	350	fputs("oseq ", f);
	351	if (iflags & GRE_CSUM)
	352	fputs("icsum ", f);
	353	if (oflags & GRE_CSUM)
	354	fputs("ocsum ", f);
	355	}
	356
	357	struct link_util gre_link_util = {
	358	.id = "gre",
	359	.maxattr = IFLA_GRE_MAX,
	360	.parse_opt = gre_parse_opt,
	361	.print_opt = gre_print_opt,
	362	};
	363
	364	struct link_util gretap_link_util = {
	365	.id = "gretap",
	366	.maxattr = IFLA_GRE_MAX,
	367	.parse_opt = gre_parse_opt,
	368	.print_opt = gre_print_opt,
	369	};