[mirror_iproute2.git] / ip / iptunnel.c

/*
 * iptunnel.c	       "ip tunnel"
 *
 *		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:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_arp.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 tunnel { add | change | del | show | prl | 6rd } [ NAME ]\n");
	fprintf(stderr, "          [ mode { ipip | gre | sit | isatap | vti } ] [ remote ADDR ] [ local ADDR ]\n");
	fprintf(stderr, "          [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
	fprintf(stderr, "          [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]\n");
	fprintf(stderr, "          [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\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  := { STRING | 00..ff | inherit | inherit/STRING | inherit/00..ff }\n");
	fprintf(stderr, "       TTL  := { 1..255 | inherit }\n");
	fprintf(stderr, "       KEY  := { DOTTED_QUAD | NUMBER }\n");
	exit(-1);
}

static void set_tunnel_proto(struct ip_tunnel_parm *p, int proto)
{
	if (p->iph.protocol && p->iph.protocol != proto) {
		fprintf(stderr,
			"You managed to ask for more than one tunnel mode.\n");
		exit(-1);
	}
	p->iph.protocol = proto;
}

static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
{
	int count = 0;
	const char *medium = NULL;
	int isatap = 0;

	memset(p, 0, sizeof(*p));
	p->iph.version = 4;
	p->iph.ihl = 5;
#ifndef IP_DF
#define IP_DF		0x4000		/* Flag: "Don't Fragment"	*/
#endif
	p->iph.frag_off = htons(IP_DF);

	while (argc > 0) {
		if (strcmp(*argv, "mode") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "ipip") == 0 ||
			    strcmp(*argv, "ip/ip") == 0) {
				set_tunnel_proto(p, IPPROTO_IPIP);
			} else if (strcmp(*argv, "gre") == 0 ||
				   strcmp(*argv, "gre/ip") == 0) {
				set_tunnel_proto(p, IPPROTO_GRE);
			} else if (strcmp(*argv, "sit") == 0 ||
				   strcmp(*argv, "ipv6/ip") == 0) {
				set_tunnel_proto(p, IPPROTO_IPV6);
			} else if (strcmp(*argv, "isatap") == 0) {
				set_tunnel_proto(p, IPPROTO_IPV6);
				isatap++;
			} else if (strcmp(*argv, "vti") == 0) {
				set_tunnel_proto(p, IPPROTO_IPIP);
				p->i_flags |= VTI_ISVTI;
			} else {
				fprintf(stderr,
					"Unknown tunnel mode \"%s\"\n", *argv);
				exit(-1);
			}
		} else if (strcmp(*argv, "key") == 0) {
			NEXT_ARG();
			p->i_flags |= GRE_KEY;
			p->o_flags |= GRE_KEY;
			p->i_key = p->o_key = tnl_parse_key("key", *argv);
		} else if (strcmp(*argv, "ikey") == 0) {
			NEXT_ARG();
			p->i_flags |= GRE_KEY;
			p->i_key = tnl_parse_key("ikey", *argv);
		} else if (strcmp(*argv, "okey") == 0) {
			NEXT_ARG();
			p->o_flags |= GRE_KEY;
			p->o_key = tnl_parse_key("okey", *argv);
		} else if (strcmp(*argv, "seq") == 0) {
			p->i_flags |= GRE_SEQ;
			p->o_flags |= GRE_SEQ;
		} else if (strcmp(*argv, "iseq") == 0) {
			p->i_flags |= GRE_SEQ;
		} else if (strcmp(*argv, "oseq") == 0) {
			p->o_flags |= GRE_SEQ;
		} else if (strcmp(*argv, "csum") == 0) {
			p->i_flags |= GRE_CSUM;
			p->o_flags |= GRE_CSUM;
		} else if (strcmp(*argv, "icsum") == 0) {
			p->i_flags |= GRE_CSUM;
		} else if (strcmp(*argv, "ocsum") == 0) {
			p->o_flags |= GRE_CSUM;
		} else if (strcmp(*argv, "nopmtudisc") == 0) {
			p->iph.frag_off = 0;
		} else if (strcmp(*argv, "pmtudisc") == 0) {
			p->iph.frag_off = htons(IP_DF);
		} else if (strcmp(*argv, "remote") == 0) {
			NEXT_ARG();
			p->iph.daddr = get_addr32(*argv);
		} else if (strcmp(*argv, "local") == 0) {
			NEXT_ARG();
			p->iph.saddr = get_addr32(*argv);
		} else if (strcmp(*argv, "dev") == 0) {
			NEXT_ARG();
			medium = *argv;
		} else if (strcmp(*argv, "ttl") == 0 ||
			   strcmp(*argv, "hoplimit") == 0 ||
			   strcmp(*argv, "hlim") == 0) {
			__u8 uval;

			NEXT_ARG();
			if (strcmp(*argv, "inherit") != 0) {
				if (get_u8(&uval, *argv, 0))
					invarg("invalid TTL\n", *argv);
				p->iph.ttl = uval;
			}
		} else if (strcmp(*argv, "tos") == 0 ||
			   strcmp(*argv, "tclass") == 0 ||
			   matches(*argv, "dsfield") == 0) {
			char *dsfield;
			__u32 uval;

			NEXT_ARG();
			dsfield = *argv;
			strsep(&dsfield, "/");
			if (strcmp(*argv, "inherit") != 0) {
				dsfield = *argv;
				p->iph.tos = 0;
			} else
				p->iph.tos = 1;
			if (dsfield) {
				if (rtnl_dsfield_a2n(&uval, dsfield))
					invarg("bad TOS value", *argv);
				p->iph.tos |= uval;
			}
		} else {
			if (strcmp(*argv, "name") == 0)
				NEXT_ARG();
			else if (matches(*argv, "help") == 0)
				usage();

			if (p->name[0])
				duparg2("name", *argv);
			if (get_ifname(p->name, *argv))
				invarg("\"name\" not a valid ifname", *argv);
			if (cmd == SIOCCHGTUNNEL && count == 0) {
				struct ip_tunnel_parm old_p = {};

				if (tnl_get_ioctl(*argv, &old_p))
					return -1;
				*p = old_p;
			}
		}
		count++;
		argc--; argv++;
	}


	if (p->iph.protocol == 0) {
		if (memcmp(p->name, "gre", 3) == 0)
			p->iph.protocol = IPPROTO_GRE;
		else if (memcmp(p->name, "ipip", 4) == 0)
			p->iph.protocol = IPPROTO_IPIP;
		else if (memcmp(p->name, "sit", 3) == 0)
			p->iph.protocol = IPPROTO_IPV6;
		else if (memcmp(p->name, "isatap", 6) == 0) {
			p->iph.protocol = IPPROTO_IPV6;
			isatap++;
		} else if (memcmp(p->name, "vti", 3) == 0) {
			p->iph.protocol = IPPROTO_IPIP;
			p->i_flags |= VTI_ISVTI;
		}
	}

	if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
		if (!(p->i_flags & VTI_ISVTI) &&
		    (p->iph.protocol != IPPROTO_GRE)) {
			fprintf(stderr, "Keys are not allowed with ipip and sit tunnels\n");
			return -1;
		}
	}

	if (medium) {
		p->link = ll_name_to_index(medium);
		if (!p->link)
			return nodev(medium);
	}

	if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
		p->i_key = p->iph.daddr;
		p->i_flags |= GRE_KEY;
	}
	if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
		p->o_key = p->iph.daddr;
		p->o_flags |= GRE_KEY;
	}
	if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
		fprintf(stderr, "A broadcast tunnel requires a source address\n");
		return -1;
	}
	if (isatap)
		p->i_flags |= SIT_ISATAP;

	return 0;
}

static const char *tnl_defname(const struct ip_tunnel_parm *p)
{
	switch (p->iph.protocol) {
	case IPPROTO_IPIP:
		if (p->i_flags & VTI_ISVTI)
			return "ip_vti0";
		else
			return "tunl0";
	case IPPROTO_GRE:
		return "gre0";
	case IPPROTO_IPV6:
		return "sit0";
	}
	return NULL;
}

static int do_add(int cmd, int argc, char **argv)
{
	struct ip_tunnel_parm p;
	const char *basedev;

	if (parse_args(argc, argv, cmd, &p) < 0)
		return -1;

	if (p.iph.ttl && p.iph.frag_off == 0) {
		fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
		return -1;
	}

	basedev = tnl_defname(&p);
	if (!basedev) {
		fprintf(stderr,
			"cannot determine tunnel mode (ipip, gre, vti or sit)\n");
		return -1;
	}

	return tnl_add_ioctl(cmd, basedev, p.name, &p);
}

static int do_del(int argc, char **argv)
{
	struct ip_tunnel_parm p;

	if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
		return -1;

	return tnl_del_ioctl(tnl_defname(&p) ? : p.name, p.name, &p);
}

static void print_tunnel(const void *t)
{
	const struct ip_tunnel_parm *p = t;
	struct ip_tunnel_6rd ip6rd = {};
	char s1[1024];
	char s2[1024];

	/* Do not use format_host() for local addr,
	 * symbolic name will not be useful.
	 */
	printf("%s: %s/ip remote %s local %s",
	       p->name,
	       tnl_strproto(p->iph.protocol),
	       p->iph.daddr ? format_host_r(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any",
	       p->iph.saddr ? rt_addr_n2a_r(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");

	if (p->iph.protocol == IPPROTO_IPV6 && (p->i_flags & SIT_ISATAP)) {
		struct ip_tunnel_prl prl[16] = {};
		int i;

		prl[0].datalen = sizeof(prl) - sizeof(prl[0]);
		prl[0].addr = htonl(INADDR_ANY);

		if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl))
			for (i = 1; i < ARRAY_SIZE(prl); i++) {
				if (prl[i].addr != htonl(INADDR_ANY)) {
					printf(" %s %s ",
					       (prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr",
					       format_host(AF_INET, 4, &prl[i].addr));
				}
			}
	}

	if (p->link) {
		const char *n = ll_index_to_name(p->link);

		if (n)
			printf(" dev %s", n);
	}

	if (p->iph.ttl)
		printf(" ttl %u", p->iph.ttl);
	else
		printf(" ttl inherit");

	if (p->iph.tos) {
		SPRINT_BUF(b1);
		printf(" tos");
		if (p->iph.tos & 1)
			printf(" inherit");
		if (p->iph.tos & ~1)
			printf("%c%s ", p->iph.tos & 1 ? '/' : ' ',
			       rtnl_dsfield_n2a(p->iph.tos & ~1, b1, sizeof(b1)));
	}

	if (!(p->iph.frag_off & htons(IP_DF)))
		printf(" nopmtudisc");

	if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) {
		printf(" 6rd-prefix %s/%u",
		       inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)),
		       ip6rd.prefixlen);
		if (ip6rd.relay_prefix) {
			printf(" 6rd-relay_prefix %s/%u",
			       format_host(AF_INET, 4, &ip6rd.relay_prefix),
			       ip6rd.relay_prefixlen);
		}
	}

	if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) && p->o_key == p->i_key)
		printf(" key %u", ntohl(p->i_key));
	else if ((p->i_flags | p->o_flags) & GRE_KEY) {
		if (p->i_flags & GRE_KEY)
			printf(" ikey %u", ntohl(p->i_key));
		if (p->o_flags & GRE_KEY)
			printf(" okey %u", ntohl(p->o_key));
	}

	if (p->i_flags & GRE_SEQ)
		printf("%s  Drop packets out of sequence.", _SL_);
	if (p->i_flags & GRE_CSUM)
		printf("%s  Checksum in received packet is required.", _SL_);
	if (p->o_flags & GRE_SEQ)
		printf("%s  Sequence packets on output.", _SL_);
	if (p->o_flags & GRE_CSUM)
		printf("%s  Checksum output packets.", _SL_);
}


static void ip_tunnel_parm_initialize(const struct tnl_print_nlmsg_info *info)
{
	struct ip_tunnel_parm *p2 = info->p2;

	memset(p2, 0, sizeof(*p2));
}

static bool ip_tunnel_parm_match(const struct tnl_print_nlmsg_info *info)
{
	const struct ip_tunnel_parm *p1 = info->p1;
	const struct ip_tunnel_parm *p2 = info->p2;

	return ((!p1->link || p1->link == p2->link) &&
		(!p1->name[0] || strcmp(p1->name, p2->name) == 0) &&
		(!p1->iph.daddr || p1->iph.daddr == p2->iph.daddr) &&
		(!p1->iph.saddr || p1->iph.saddr == p2->iph.saddr) &&
		(!p1->i_key || p1->i_key == p2->i_key));
}

static int do_show(int argc, char **argv)
{
	struct ip_tunnel_parm p, p1;
	const char *basedev;

	if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
		return -1;

	basedev = tnl_defname(&p);
	if (!basedev) {
		struct tnl_print_nlmsg_info info = {
			.p1    = &p,
			.p2    = &p1,
			.init  = ip_tunnel_parm_initialize,
			.match = ip_tunnel_parm_match,
			.print = print_tunnel,
		};

		return do_tunnels_list(&info);
	}

	if (tnl_get_ioctl(p.name[0] ? p.name : basedev, &p))
		return -1;

	print_tunnel(&p);
	fputc('\n', stdout);
	return 0;
}

static int do_prl(int argc, char **argv)
{
	struct ip_tunnel_prl p = {};
	int count = 0;
	int cmd = 0;
	const char *medium = NULL;

	while (argc > 0) {
		if (strcmp(*argv, "prl-default") == 0) {
			NEXT_ARG();
			cmd = SIOCADDPRL;
			p.addr = get_addr32(*argv);
			p.flags |= PRL_DEFAULT;
			count++;
		} else if (strcmp(*argv, "prl-nodefault") == 0) {
			NEXT_ARG();
			cmd = SIOCADDPRL;
			p.addr = get_addr32(*argv);
			count++;
		} else if (strcmp(*argv, "prl-delete") == 0) {
			NEXT_ARG();
			cmd = SIOCDELPRL;
			p.addr = get_addr32(*argv);
			count++;
		} else if (strcmp(*argv, "dev") == 0) {
			NEXT_ARG();
			if (check_ifname(*argv))
				invarg("\"dev\" not a valid ifname", *argv);
			medium = *argv;
		} else {
			fprintf(stderr,
				"Invalid PRL parameter \"%s\"\n", *argv);
			exit(-1);
		}
		if (count > 1) {
			fprintf(stderr,
				"One PRL entry at a time\n");
			exit(-1);
		}
		argc--; argv++;
	}
	if (!medium) {
		fprintf(stderr, "Must specify device\n");
		exit(-1);
	}

	return tnl_prl_ioctl(cmd, medium, &p);
}

static int do_6rd(int argc, char **argv)
{
	struct ip_tunnel_6rd ip6rd = {};
	int cmd = 0;
	const char *medium = NULL;
	inet_prefix prefix;

	while (argc > 0) {
		if (strcmp(*argv, "6rd-prefix") == 0) {
			NEXT_ARG();
			if (get_prefix(&prefix, *argv, AF_INET6))
				invarg("invalid 6rd_prefix\n", *argv);
			cmd = SIOCADD6RD;
			memcpy(&ip6rd.prefix, prefix.data, 16);
			ip6rd.prefixlen = prefix.bitlen;
		} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
			NEXT_ARG();
			if (get_prefix(&prefix, *argv, AF_INET))
				invarg("invalid 6rd-relay_prefix\n", *argv);
			cmd = SIOCADD6RD;
			memcpy(&ip6rd.relay_prefix, prefix.data, 4);
			ip6rd.relay_prefixlen = prefix.bitlen;
		} else if (strcmp(*argv, "6rd-reset") == 0) {
			cmd = SIOCDEL6RD;
		} else if (strcmp(*argv, "dev") == 0) {
			NEXT_ARG();
			if (check_ifname(*argv))
				invarg("\"dev\" not a valid ifname", *argv);
			medium = *argv;
		} else {
			fprintf(stderr,
				"Invalid 6RD parameter \"%s\"\n", *argv);
			exit(-1);
		}
		argc--; argv++;
	}
	if (!medium) {
		fprintf(stderr, "Must specify device\n");
		exit(-1);
	}

	return tnl_6rd_ioctl(cmd, medium, &ip6rd);
}

static int tunnel_mode_is_ipv6(char *tunnel_mode)
{
	static const char * const ipv6_modes[] = {
		"ipv6/ipv6", "ip6ip6",
		"vti6",
		"ip/ipv6", "ipv4/ipv6", "ipip6", "ip4ip6",
		"ip6gre", "gre/ipv6",
		"any/ipv6", "any"
	};
	int i;

	for (i = 0; i < ARRAY_SIZE(ipv6_modes); i++) {
		if (strcmp(ipv6_modes[i], tunnel_mode) == 0)
			return 1;
	}
	return 0;
}

int do_iptunnel(int argc, char **argv)
{
	int i;

	for (i = 0; i < argc - 1; i++) {
		if (strcmp(argv[i], "mode") == 0) {
			if (tunnel_mode_is_ipv6(argv[i + 1]))
				preferred_family = AF_INET6;
			break;
		}
	}
	switch (preferred_family) {
	case AF_UNSPEC:
		preferred_family = AF_INET;
		break;
	case AF_INET:
		break;
	/*
	 * This is silly enough but we have no easy way to make it
	 * protocol-independent because of unarranged structure between
	 * IPv4 and IPv6.
	 */
	case AF_INET6:
		return do_ip6tunnel(argc, argv);
	default:
		fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
		exit(-1);
	}

	if (argc > 0) {
		if (matches(*argv, "add") == 0)
			return do_add(SIOCADDTUNNEL, argc - 1, argv + 1);
		if (matches(*argv, "change") == 0)
			return do_add(SIOCCHGTUNNEL, argc - 1, argv + 1);
		if (matches(*argv, "delete") == 0)
			return do_del(argc - 1, argv + 1);
		if (matches(*argv, "show") == 0 ||
		    matches(*argv, "lst") == 0 ||
		    matches(*argv, "list") == 0)
			return do_show(argc - 1, argv + 1);
		if (matches(*argv, "prl") == 0)
			return do_prl(argc - 1, argv + 1);
		if (matches(*argv, "6rd") == 0)
			return do_6rd(argc - 1, argv + 1);
		if (matches(*argv, "help") == 0)
			usage();
	} else
		return do_show(0, NULL);

	fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\"\n", *argv);
	exit(-1);
}
Commit	Line	Data
aba5acdf SH	1	/*
	2	* iptunnel.c "ip tunnel"
	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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	10	*
aba5acdf SH	11	*/
	12
	13	#include <stdio.h>
	14	#include <stdlib.h>
	15	#include <string.h>
	16	#include <unistd.h>
d9bd1bd9	17	#include <sys/types.h>
aba5acdf	18	#include <sys/socket.h>
7272ddc7	19	#include <arpa/inet.h>
aba5acdf	20	#include <sys/ioctl.h>
ea71beac SH	21	#include <net/if.h>
ea71beac SH	22	#include <net/if_arp.h>
7272ddc7	23	#include <linux/ip.h>
aba5acdf SH	24	#include <linux/if_tunnel.h>
	25
	26	#include "rt_names.h"
	27	#include "utils.h"
288384f2	28	#include "ip_common.h"
d9bd1bd9	29	#include "tunnel.h"
aba5acdf SH	30
	31	static void usage(void) __attribute__((noreturn));
	32
	33	static void usage(void)
	34	{
b88215c4	35	fprintf(stderr, "Usage: ip tunnel { add \| change \| del \| show \| prl \| 6rd } [ NAME ]\n");
eec47608	36	fprintf(stderr, " [ mode { ipip \| gre \| sit \| isatap \| vti } ] [ remote ADDR ] [ local ADDR ]\n");
aba5acdf	37	fprintf(stderr, " [ [i\|o]seq ] [ [i\|o]key KEY ] [ [i\|o]csum ]\n");
a07e9912	38	fprintf(stderr, " [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]\n");
b88215c4	39	fprintf(stderr, " [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n");
aba5acdf SH	40	fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
	41	fprintf(stderr, "\n");
	42	fprintf(stderr, "Where: NAME := STRING\n");
	43	fprintf(stderr, " ADDR := { IP_ADDRESS \| any }\n");
e59fd3db	44	fprintf(stderr, " TOS := { STRING \| 00..ff \| inherit \| inherit/STRING \| inherit/00..ff }\n");
aba5acdf SH	45	fprintf(stderr, " TTL := { 1..255 \| inherit }\n");
	46	fprintf(stderr, " KEY := { DOTTED_QUAD \| NUMBER }\n");
	47	exit(-1);
	48	}
	49
2520598a PS	50	static void set_tunnel_proto(struct ip_tunnel_parm *p, int proto)
	51	{
	52	if (p->iph.protocol && p->iph.protocol != proto) {
a96a5d94 SH	53	fprintf(stderr,
a96a5d94 SH	54	"You managed to ask for more than one tunnel mode.\n");
2520598a PS	55	exit(-1);
	56	}
	57	p->iph.protocol = proto;
	58	}
	59
aba5acdf SH	60	static int parse_args(int argc, char *argv, int cmd, struct ip_tunnel_parm p)
	61	{
	62	int count = 0;
26111ab1	63	const char *medium = NULL;
0bd17929	64	int isatap = 0;
aba5acdf SH	65
aba5acdf SH	66	memset(p, 0, sizeof(*p));
aba5acdf SH	67	p->iph.version = 4;
	68	p->iph.ihl = 5;
	69	#ifndef IP_DF
	70	#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
	71	#endif
	72	p->iph.frag_off = htons(IP_DF);
	73
	74	while (argc > 0) {
	75	if (strcmp(*argv, "mode") == 0) {
	76	NEXT_ARG();
	77	if (strcmp(*argv, "ipip") == 0 \|\|
	78	strcmp(*argv, "ip/ip") == 0) {
2520598a	79	set_tunnel_proto(p, IPPROTO_IPIP);
aba5acdf SH	80	} else if (strcmp(*argv, "gre") == 0 \|\|
aba5acdf SH	81	strcmp(*argv, "gre/ip") == 0) {
2520598a	82	set_tunnel_proto(p, IPPROTO_GRE);
aba5acdf SH	83	} else if (strcmp(*argv, "sit") == 0 \|\|
aba5acdf SH	84	strcmp(*argv, "ipv6/ip") == 0) {
2520598a	85	set_tunnel_proto(p, IPPROTO_IPV6);
0bd17929	86	} else if (strcmp(*argv, "isatap") == 0) {
2520598a	87	set_tunnel_proto(p, IPPROTO_IPV6);
0bd17929	88	isatap++;
eec47608	89	} else if (strcmp(*argv, "vti") == 0) {
2520598a	90	set_tunnel_proto(p, IPPROTO_IPIP);
eec47608	91	p->i_flags \|= VTI_ISVTI;
aba5acdf	92	} else {
a96a5d94 SH	93	fprintf(stderr,
a96a5d94 SH	94	"Unknown tunnel mode \"%s\"\n", *argv);
aba5acdf SH	95	exit(-1);
	96	}
	97	} else if (strcmp(*argv, "key") == 0) {
aba5acdf SH	98	NEXT_ARG();
	99	p->i_flags \|= GRE_KEY;
	100	p->o_flags \|= GRE_KEY;
a7ed1520	101	p->i_key = p->o_key = tnl_parse_key("key", *argv);
aba5acdf	102	} else if (strcmp(*argv, "ikey") == 0) {
aba5acdf SH	103	NEXT_ARG();
aba5acdf SH	104	p->i_flags \|= GRE_KEY;
a7ed1520	105	p->i_key = tnl_parse_key("ikey", *argv);
aba5acdf	106	} else if (strcmp(*argv, "okey") == 0) {
aba5acdf SH	107	NEXT_ARG();
aba5acdf SH	108	p->o_flags \|= GRE_KEY;
a7ed1520	109	p->o_key = tnl_parse_key("okey", *argv);
aba5acdf SH	110	} else if (strcmp(*argv, "seq") == 0) {
	111	p->i_flags \|= GRE_SEQ;
	112	p->o_flags \|= GRE_SEQ;
	113	} else if (strcmp(*argv, "iseq") == 0) {
	114	p->i_flags \|= GRE_SEQ;
	115	} else if (strcmp(*argv, "oseq") == 0) {
	116	p->o_flags \|= GRE_SEQ;
	117	} else if (strcmp(*argv, "csum") == 0) {
	118	p->i_flags \|= GRE_CSUM;
	119	p->o_flags \|= GRE_CSUM;
	120	} else if (strcmp(*argv, "icsum") == 0) {
	121	p->i_flags \|= GRE_CSUM;
	122	} else if (strcmp(*argv, "ocsum") == 0) {
	123	p->o_flags \|= GRE_CSUM;
	124	} else if (strcmp(*argv, "nopmtudisc") == 0) {
	125	p->iph.frag_off = 0;
	126	} else if (strcmp(*argv, "pmtudisc") == 0) {
	127	p->iph.frag_off = htons(IP_DF);
	128	} else if (strcmp(*argv, "remote") == 0) {
	129	NEXT_ARG();
57daab1e	130	p->iph.daddr = get_addr32(*argv);
aba5acdf SH	131	} else if (strcmp(*argv, "local") == 0) {
aba5acdf SH	132	NEXT_ARG();
57daab1e	133	p->iph.saddr = get_addr32(*argv);
aba5acdf SH	134	} else if (strcmp(*argv, "dev") == 0) {
aba5acdf SH	135	NEXT_ARG();
26111ab1	136	medium = *argv;
eddde110	137	} else if (strcmp(*argv, "ttl") == 0 \|\|
0dd4d2b3 PS	138	strcmp(*argv, "hoplimit") == 0 \|\|
	139	strcmp(*argv, "hlim") == 0) {
	140	__u8 uval;
a96a5d94	141
aba5acdf SH	142	NEXT_ARG();
aba5acdf SH	143	if (strcmp(*argv, "inherit") != 0) {
0dd4d2b3	144	if (get_u8(&uval, *argv, 0))
aba5acdf	145	invarg("invalid TTL\n", *argv);
aba5acdf SH	146	p->iph.ttl = uval;
	147	}
	148	} else if (strcmp(*argv, "tos") == 0 \|\|
eddde110	149	strcmp(*argv, "tclass") == 0 \|\|
aba5acdf	150	matches(*argv, "dsfield") == 0) {
e59fd3db	151	char *dsfield;
aba5acdf	152	__u32 uval;
a96a5d94	153
aba5acdf	154	NEXT_ARG();
e59fd3db DW	155	dsfield = *argv;
e59fd3db DW	156	strsep(&dsfield, "/");
aba5acdf	157	if (strcmp(*argv, "inherit") != 0) {
e59fd3db DW	158	dsfield = *argv;
e59fd3db DW	159	p->iph.tos = 0;
aba5acdf SH	160	} else
aba5acdf SH	161	p->iph.tos = 1;
e59fd3db DW	162	if (dsfield) {
	163	if (rtnl_dsfield_a2n(&uval, dsfield))
	164	invarg("bad TOS value", *argv);
	165	p->iph.tos \|= uval;
	166	}
aba5acdf	167	} else {
a96a5d94	168	if (strcmp(*argv, "name") == 0)
aba5acdf	169	NEXT_ARG();
a96a5d94	170	else if (matches(*argv, "help") == 0)
aba5acdf	171	usage();
a96a5d94	172
aba5acdf SH	173	if (p->name[0])
aba5acdf SH	174	duparg2("name", *argv);
625df645 PS	175	if (get_ifname(p->name, *argv))
625df645 PS	176	invarg("\"name\" not a valid ifname", *argv);
aba5acdf	177	if (cmd == SIOCCHGTUNNEL && count == 0) {
d17b136f	178	struct ip_tunnel_parm old_p = {};
a96a5d94	179
d9bd1bd9	180	if (tnl_get_ioctl(*argv, &old_p))
aba5acdf SH	181	return -1;
	182	*p = old_p;
	183	}
	184	}
	185	count++;
	186	argc--; argv++;
	187	}
	188
	189
	190	if (p->iph.protocol == 0) {
	191	if (memcmp(p->name, "gre", 3) == 0)
	192	p->iph.protocol = IPPROTO_GRE;
	193	else if (memcmp(p->name, "ipip", 4) == 0)
	194	p->iph.protocol = IPPROTO_IPIP;
	195	else if (memcmp(p->name, "sit", 3) == 0)
	196	p->iph.protocol = IPPROTO_IPV6;
0bd17929 TF	197	else if (memcmp(p->name, "isatap", 6) == 0) {
	198	p->iph.protocol = IPPROTO_IPV6;
	199	isatap++;
eec47608 SM	200	} else if (memcmp(p->name, "vti", 3) == 0) {
	201	p->iph.protocol = IPPROTO_IPIP;
	202	p->i_flags \|= VTI_ISVTI;
0bd17929	203	}
aba5acdf SH	204	}
aba5acdf SH	205
1c28bd59 HL	206	if ((p->i_flags & GRE_KEY) \|\| (p->o_flags & GRE_KEY)) {
	207	if (!(p->i_flags & VTI_ISVTI) &&
	208	(p->iph.protocol != IPPROTO_GRE)) {
14645ec2	209	fprintf(stderr, "Keys are not allowed with ipip and sit tunnels\n");
aba5acdf SH	210	return -1;
	211	}
	212	}
	213
26111ab1	214	if (medium) {
4b3cb962	215	p->link = ll_name_to_index(medium);
fe99adbc SP	216	if (!p->link)
fe99adbc SP	217	return nodev(medium);
aba5acdf SH	218	}
	219
	220	if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
	221	p->i_key = p->iph.daddr;
	222	p->i_flags \|= GRE_KEY;
	223	}
	224	if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
	225	p->o_key = p->iph.daddr;
	226	p->o_flags \|= GRE_KEY;
	227	}
	228	if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
14645ec2	229	fprintf(stderr, "A broadcast tunnel requires a source address\n");
aba5acdf SH	230	return -1;
aba5acdf SH	231	}
eeef12c5	232	if (isatap)
0bd17929	233	p->i_flags \|= SIT_ISATAP;
0bd17929	234
aba5acdf SH	235	return 0;
	236	}
	237
c957821b PS	238	static const char tnl_defname(const struct ip_tunnel_parm p)
	239	{
	240	switch (p->iph.protocol) {
	241	case IPPROTO_IPIP:
	242	if (p->i_flags & VTI_ISVTI)
	243	return "ip_vti0";
	244	else
	245	return "tunl0";
	246	case IPPROTO_GRE:
	247	return "gre0";
	248	case IPPROTO_IPV6:
	249	return "sit0";
	250	}
	251	return NULL;
	252	}
aba5acdf SH	253
	254	static int do_add(int cmd, int argc, char **argv)
	255	{
	256	struct ip_tunnel_parm p;
c957821b	257	const char *basedev;
aba5acdf SH	258
	259	if (parse_args(argc, argv, cmd, &p) < 0)
	260	return -1;
	261
	262	if (p.iph.ttl && p.iph.frag_off == 0) {
30d07e9e	263	fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
aba5acdf SH	264	return -1;
	265	}
	266
a96a5d94 SH	267	basedev = tnl_defname(&p);
	268	if (!basedev) {
	269	fprintf(stderr,
	270	"cannot determine tunnel mode (ipip, gre, vti or sit)\n");
aba5acdf SH	271	return -1;
aba5acdf SH	272	}
c957821b PS	273
c957821b PS	274	return tnl_add_ioctl(cmd, basedev, p.name, &p);
aba5acdf SH	275	}
aba5acdf SH	276
d9bd1bd9	277	static int do_del(int argc, char **argv)
aba5acdf SH	278	{
	279	struct ip_tunnel_parm p;
	280
	281	if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
	282	return -1;
	283
c957821b	284	return tnl_del_ioctl(tnl_defname(&p) ? : p.name, p.name, &p);
aba5acdf SH	285	}
aba5acdf SH	286
3e953938	287	static void print_tunnel(const void *t)
aba5acdf	288	{
3e953938	289	const struct ip_tunnel_parm *p = t;
d17b136f	290	struct ip_tunnel_6rd ip6rd = {};
aba5acdf SH	291	char s1[1024];
aba5acdf SH	292	char s2[1024];
aba5acdf	293
aba5acdf SH	294	/* Do not use format_host() for local addr,
	295	* symbolic name will not be useful.
	296	*/
8de592d0	297	printf("%s: %s/ip remote %s local %s",
aba5acdf	298	p->name,
d9bd1bd9	299	tnl_strproto(p->iph.protocol),
a418e451	300	p->iph.daddr ? format_host_r(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any",
2e96d2cc	301	p->iph.saddr ? rt_addr_n2a_r(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");
aba5acdf	302
86c00faa	303	if (p->iph.protocol == IPPROTO_IPV6 && (p->i_flags & SIT_ISATAP)) {
d17b136f	304	struct ip_tunnel_prl prl[16] = {};
a07e9912	305	int i;
0612519e	306
a07e9912 SH	307	prl[0].datalen = sizeof(prl) - sizeof(prl[0]);
a07e9912 SH	308	prl[0].addr = htonl(INADDR_ANY);
0612519e	309
a07e9912	310	if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl))
a96a5d94 SH	311	for (i = 1; i < ARRAY_SIZE(prl); i++) {
	312	if (prl[i].addr != htonl(INADDR_ANY)) {
	313	printf(" %s %s ",
	314	(prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr",
a418e451	315	format_host(AF_INET, 4, &prl[i].addr));
a96a5d94	316	}
a07e9912	317	}
a07e9912 SH	318	}
a07e9912 SH	319
aba5acdf	320	if (p->link) {
ea71beac	321	const char *n = ll_index_to_name(p->link);
a96a5d94	322
aba5acdf	323	if (n)
8de592d0	324	printf(" dev %s", n);
aba5acdf SH	325	}
	326
	327	if (p->iph.ttl)
375560c4	328	printf(" ttl %u", p->iph.ttl);
aba5acdf	329	else
8de592d0	330	printf(" ttl inherit");
ae665a52	331
aba5acdf SH	332	if (p->iph.tos) {
	333	SPRINT_BUF(b1);
	334	printf(" tos");
04ce8d3e	335	if (p->iph.tos & 1)
aba5acdf	336	printf(" inherit");
04ce8d3e PS	337	if (p->iph.tos & ~1)
	338	printf("%c%s ", p->iph.tos & 1 ? '/' : ' ',
	339	rtnl_dsfield_n2a(p->iph.tos & ~1, b1, sizeof(b1)));
aba5acdf SH	340	}
aba5acdf SH	341
04ce8d3e	342	if (!(p->iph.frag_off & htons(IP_DF)))
aba5acdf SH	343	printf(" nopmtudisc");
aba5acdf SH	344
3979ef91	345	if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) {
8de592d0	346	printf(" 6rd-prefix %s/%u",
b88215c4 AC	347	inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)),
	348	ip6rd.prefixlen);
	349	if (ip6rd.relay_prefix) {
8de592d0	350	printf(" 6rd-relay_prefix %s/%u",
a418e451	351	format_host(AF_INET, 4, &ip6rd.relay_prefix),
b88215c4 AC	352	ip6rd.relay_prefixlen);
	353	}
	354	}
	355
04ce8d3e	356	if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) && p->o_key == p->i_key)
6f4f7c46	357	printf(" key %u", ntohl(p->i_key));
04ce8d3e PS	358	else if ((p->i_flags \| p->o_flags) & GRE_KEY) {
04ce8d3e PS	359	if (p->i_flags & GRE_KEY)
8de592d0	360	printf(" ikey %u", ntohl(p->i_key));
04ce8d3e	361	if (p->o_flags & GRE_KEY)
8de592d0	362	printf(" okey %u", ntohl(p->o_key));
aba5acdf SH	363	}
aba5acdf SH	364
04ce8d3e	365	if (p->i_flags & GRE_SEQ)
4cb8d030	366	printf("%s Drop packets out of sequence.", _SL_);
04ce8d3e	367	if (p->i_flags & GRE_CSUM)
aba5acdf	368	printf("%s Checksum in received packet is required.", _SL_);
04ce8d3e	369	if (p->o_flags & GRE_SEQ)
aba5acdf	370	printf("%s Sequence packets on output.", _SL_);
04ce8d3e	371	if (p->o_flags & GRE_CSUM)
aba5acdf SH	372	printf("%s Checksum output packets.", _SL_);
	373	}
	374
3e953938 SP	375
	376	static void ip_tunnel_parm_initialize(const struct tnl_print_nlmsg_info *info)
	377	{
	378	struct ip_tunnel_parm *p2 = info->p2;
	379
	380	memset(p2, 0, sizeof(*p2));
	381	}
	382
	383	static bool ip_tunnel_parm_match(const struct tnl_print_nlmsg_info *info)
ec895940	384	{
3e953938 SP	385	const struct ip_tunnel_parm *p1 = info->p1;
	386	const struct ip_tunnel_parm *p2 = info->p2;
	387
ec895940 SP	388	return ((!p1->link \|\| p1->link == p2->link) &&
	389	(!p1->name[0] \|\| strcmp(p1->name, p2->name) == 0) &&
	390	(!p1->iph.daddr \|\| p1->iph.daddr == p2->iph.daddr) &&
	391	(!p1->iph.saddr \|\| p1->iph.saddr == p2->iph.saddr) &&
	392	(!p1->i_key \|\| p1->i_key == p2->i_key));
	393	}
	394
aba5acdf SH	395	static int do_show(int argc, char **argv)
aba5acdf SH	396	{
3e953938	397	struct ip_tunnel_parm p, p1;
c957821b	398	const char *basedev;
aba5acdf SH	399
	400	if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
	401	return -1;
	402
a96a5d94	403	basedev = tnl_defname(&p);
3e953938 SP	404	if (!basedev) {
	405	struct tnl_print_nlmsg_info info = {
	406	.p1 = &p,
	407	.p2 = &p1,
	408	.init = ip_tunnel_parm_initialize,
	409	.match = ip_tunnel_parm_match,
	410	.print = print_tunnel,
	411	};
	412
	413	return do_tunnels_list(&info);
	414	}
c957821b PS	415
c957821b PS	416	if (tnl_get_ioctl(p.name[0] ? p.name : basedev, &p))
aba5acdf SH	417	return -1;
	418
	419	print_tunnel(&p);
ec895940	420	fputc('\n', stdout);
aba5acdf SH	421	return 0;
	422	}
	423
a07e9912 SH	424	static int do_prl(int argc, char **argv)
a07e9912 SH	425	{
d17b136f	426	struct ip_tunnel_prl p = {};
a07e9912	427	int count = 0;
a07e9912	428	int cmd = 0;
26111ab1	429	const char *medium = NULL;
a07e9912 SH	430
	431	while (argc > 0) {
	432	if (strcmp(*argv, "prl-default") == 0) {
	433	NEXT_ARG();
	434	cmd = SIOCADDPRL;
	435	p.addr = get_addr32(*argv);
	436	p.flags \|= PRL_DEFAULT;
	437	count++;
	438	} else if (strcmp(*argv, "prl-nodefault") == 0) {
	439	NEXT_ARG();
	440	cmd = SIOCADDPRL;
	441	p.addr = get_addr32(*argv);
	442	count++;
	443	} else if (strcmp(*argv, "prl-delete") == 0) {
	444	NEXT_ARG();
	445	cmd = SIOCDELPRL;
	446	p.addr = get_addr32(*argv);
	447	count++;
	448	} else if (strcmp(*argv, "dev") == 0) {
	449	NEXT_ARG();
625df645 PS	450	if (check_ifname(*argv))
625df645 PS	451	invarg("\"dev\" not a valid ifname", *argv);
26111ab1	452	medium = *argv;
a07e9912	453	} else {
a96a5d94 SH	454	fprintf(stderr,
a96a5d94 SH	455	"Invalid PRL parameter \"%s\"\n", *argv);
a07e9912 SH	456	exit(-1);
	457	}
	458	if (count > 1) {
a96a5d94 SH	459	fprintf(stderr,
a96a5d94 SH	460	"One PRL entry at a time\n");
a07e9912 SH	461	exit(-1);
	462	}
	463	argc--; argv++;
	464	}
26111ab1	465	if (!medium) {
14645ec2	466	fprintf(stderr, "Must specify device\n");
a07e9912 SH	467	exit(-1);
	468	}
	469
	470	return tnl_prl_ioctl(cmd, medium, &p);
	471	}
	472
b88215c4 AC	473	static int do_6rd(int argc, char **argv)
b88215c4 AC	474	{
d17b136f	475	struct ip_tunnel_6rd ip6rd = {};
b88215c4	476	int cmd = 0;
26111ab1	477	const char *medium = NULL;
b88215c4 AC	478	inet_prefix prefix;
b88215c4 AC	479
b88215c4 AC	480	while (argc > 0) {
	481	if (strcmp(*argv, "6rd-prefix") == 0) {
	482	NEXT_ARG();
	483	if (get_prefix(&prefix, *argv, AF_INET6))
	484	invarg("invalid 6rd_prefix\n", *argv);
	485	cmd = SIOCADD6RD;
	486	memcpy(&ip6rd.prefix, prefix.data, 16);
	487	ip6rd.prefixlen = prefix.bitlen;
	488	} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
	489	NEXT_ARG();
	490	if (get_prefix(&prefix, *argv, AF_INET))
	491	invarg("invalid 6rd-relay_prefix\n", *argv);
	492	cmd = SIOCADD6RD;
	493	memcpy(&ip6rd.relay_prefix, prefix.data, 4);
	494	ip6rd.relay_prefixlen = prefix.bitlen;
	495	} else if (strcmp(*argv, "6rd-reset") == 0) {
	496	cmd = SIOCDEL6RD;
	497	} else if (strcmp(*argv, "dev") == 0) {
	498	NEXT_ARG();
625df645 PS	499	if (check_ifname(*argv))
625df645 PS	500	invarg("\"dev\" not a valid ifname", *argv);
26111ab1	501	medium = *argv;
b88215c4	502	} else {
a96a5d94 SH	503	fprintf(stderr,
a96a5d94 SH	504	"Invalid 6RD parameter \"%s\"\n", *argv);
b88215c4 AC	505	exit(-1);
	506	}
	507	argc--; argv++;
	508	}
26111ab1	509	if (!medium) {
14645ec2	510	fprintf(stderr, "Must specify device\n");
b88215c4 AC	511	exit(-1);
	512	}
	513
	514	return tnl_6rd_ioctl(cmd, medium, &ip6rd);
	515	}
	516
a96a5d94 SH	517	static int tunnel_mode_is_ipv6(char *tunnel_mode)
	518	{
	519	static const char * const ipv6_modes[] = {
cc9c1dfa KS	520	"ipv6/ipv6", "ip6ip6",
	521	"vti6",
	522	"ip/ipv6", "ipv4/ipv6", "ipip6", "ip4ip6",
	523	"ip6gre", "gre/ipv6",
	524	"any/ipv6", "any"
	525	};
	526	int i;
	527
a96a5d94	528	for (i = 0; i < ARRAY_SIZE(ipv6_modes); i++) {
cc9c1dfa KS	529	if (strcmp(ipv6_modes[i], tunnel_mode) == 0)
	530	return 1;
	531	}
	532	return 0;
	533	}
	534
aba5acdf SH	535	int do_iptunnel(int argc, char **argv)
aba5acdf SH	536	{
cc9c1dfa KS	537	int i;
	538
	539	for (i = 0; i < argc - 1; i++) {
	540	if (strcmp(argv[i], "mode") == 0) {
	541	if (tunnel_mode_is_ipv6(argv[i + 1]))
	542	preferred_family = AF_INET6;
	543	break;
	544	}
	545	}
d9bd1bd9 MN	546	switch (preferred_family) {
	547	case AF_UNSPEC:
	548	preferred_family = AF_INET;
	549	break;
	550	case AF_INET:
	551	break;
288384f2 MN	552	/*
	553	* This is silly enough but we have no easy way to make it
	554	* protocol-independent because of unarranged structure between
	555	* IPv4 and IPv6.
	556	*/
	557	case AF_INET6:
	558	return do_ip6tunnel(argc, argv);
d9bd1bd9	559	default:
14645ec2	560	fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
d9bd1bd9 MN	561	exit(-1);
	562	}
	563
aba5acdf SH	564	if (argc > 0) {
aba5acdf SH	565	if (matches(*argv, "add") == 0)
04ce8d3e	566	return do_add(SIOCADDTUNNEL, argc - 1, argv + 1);
aba5acdf	567	if (matches(*argv, "change") == 0)
04ce8d3e	568	return do_add(SIOCCHGTUNNEL, argc - 1, argv + 1);
6e30461e	569	if (matches(*argv, "delete") == 0)
04ce8d3e	570	return do_del(argc - 1, argv + 1);
aba5acdf SH	571	if (matches(*argv, "show") == 0 \|\|
	572	matches(*argv, "lst") == 0 \|\|
	573	matches(*argv, "list") == 0)
04ce8d3e	574	return do_show(argc - 1, argv + 1);
a07e9912	575	if (matches(*argv, "prl") == 0)
04ce8d3e	576	return do_prl(argc - 1, argv + 1);
b88215c4	577	if (matches(*argv, "6rd") == 0)
04ce8d3e	578	return do_6rd(argc - 1, argv + 1);
aba5acdf SH	579	if (matches(*argv, "help") == 0)
	580	usage();
	581	} else
	582	return do_show(0, NULL);
	583
14645ec2	584	fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\"\n", *argv);
aba5acdf SH	585	exit(-1);
aba5acdf SH	586	}