[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();
			if (strcmp(*argv, "any"))
				p->iph.daddr = get_addr32(*argv);
			else
				p->iph.daddr = htonl(INADDR_ANY);
		} else if (strcmp(*argv, "local") == 0) {
			NEXT_ARG();
			if (strcmp(*argv, "any"))
				p->iph.saddr = get_addr32(*argv);
			else
				p->iph.saddr = htonl(INADDR_ANY);
		} 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 == 0) {
			fprintf(stderr, "Cannot find device \"%s\"\n", medium);
			return -1;
		}
	}

	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(struct ip_tunnel_parm *p)
{
	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 %d", 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 int do_tunnels_list(struct ip_tunnel_parm *p)
{
	char buf[512];
	int err = -1;
	FILE *fp = fopen("/proc/net/dev", "r");

	if (fp == NULL) {
		perror("fopen");
		return -1;
	}

	/* skip header lines */
	if (!fgets(buf, sizeof(buf), fp) ||
	    !fgets(buf, sizeof(buf), fp)) {
		fprintf(stderr, "/proc/net/dev read error\n");
		goto end;
	}

	while (fgets(buf, sizeof(buf), fp) != NULL) {
		char name[IFNAMSIZ];
		int index, type;
		struct ip_tunnel_parm p1 = {};
		char *ptr;

		buf[sizeof(buf) - 1] = 0;
		ptr = strchr(buf, ':');
		if (ptr == NULL ||
		    (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
			fprintf(stderr, "Wrong format for /proc/net/dev. Giving up.\n");
			goto end;
		}
		if (p->name[0] && strcmp(p->name, name))
			continue;
		index = ll_name_to_index(name);
		if (index == 0)
			continue;
		type = ll_index_to_type(index);
		if (type == -1) {
			fprintf(stderr, "Failed to get type of \"%s\"\n", name);
			continue;
		}
		if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
			continue;
		if (tnl_get_ioctl(name, &p1))
			continue;
		if ((p->link && p1.link != p->link) ||
		    (p->name[0] && strcmp(p1.name, p->name)) ||
		    (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
		    (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
		    (p->i_key && p1.i_key != p->i_key))
			continue;
		print_tunnel(&p1);
		if (show_stats)
			tnl_print_stats(ptr);
		printf("\n");
	}
	err = 0;
 end:
	fclose(fp);
	return err;
}

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

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

	basedev = tnl_defname(&p);
	if (!basedev)
		return do_tunnels_list(&p);

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

	print_tunnel(&p);
	printf("\n");
	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();
	130	if (strcmp(*argv, "any"))
	131	p->iph.daddr = get_addr32(*argv);
4e4b7832 TLSC	132	else
4e4b7832 TLSC	133	p->iph.daddr = htonl(INADDR_ANY);
aba5acdf SH	134	} else if (strcmp(*argv, "local") == 0) {
	135	NEXT_ARG();
	136	if (strcmp(*argv, "any"))
	137	p->iph.saddr = get_addr32(*argv);
4e4b7832 TLSC	138	else
4e4b7832 TLSC	139	p->iph.saddr = htonl(INADDR_ANY);
aba5acdf SH	140	} else if (strcmp(*argv, "dev") == 0) {
aba5acdf SH	141	NEXT_ARG();
26111ab1	142	medium = *argv;
eddde110	143	} else if (strcmp(*argv, "ttl") == 0 \|\|
0dd4d2b3 PS	144	strcmp(*argv, "hoplimit") == 0 \|\|
	145	strcmp(*argv, "hlim") == 0) {
	146	__u8 uval;
a96a5d94	147
aba5acdf SH	148	NEXT_ARG();
aba5acdf SH	149	if (strcmp(*argv, "inherit") != 0) {
0dd4d2b3	150	if (get_u8(&uval, *argv, 0))
aba5acdf	151	invarg("invalid TTL\n", *argv);
aba5acdf SH	152	p->iph.ttl = uval;
	153	}
	154	} else if (strcmp(*argv, "tos") == 0 \|\|
eddde110	155	strcmp(*argv, "tclass") == 0 \|\|
aba5acdf	156	matches(*argv, "dsfield") == 0) {
e59fd3db	157	char *dsfield;
aba5acdf	158	__u32 uval;
a96a5d94	159
aba5acdf	160	NEXT_ARG();
e59fd3db DW	161	dsfield = *argv;
e59fd3db DW	162	strsep(&dsfield, "/");
aba5acdf	163	if (strcmp(*argv, "inherit") != 0) {
e59fd3db DW	164	dsfield = *argv;
e59fd3db DW	165	p->iph.tos = 0;
aba5acdf SH	166	} else
aba5acdf SH	167	p->iph.tos = 1;
e59fd3db DW	168	if (dsfield) {
	169	if (rtnl_dsfield_a2n(&uval, dsfield))
	170	invarg("bad TOS value", *argv);
	171	p->iph.tos \|= uval;
	172	}
aba5acdf	173	} else {
a96a5d94	174	if (strcmp(*argv, "name") == 0)
aba5acdf	175	NEXT_ARG();
a96a5d94	176	else if (matches(*argv, "help") == 0)
aba5acdf	177	usage();
a96a5d94	178
aba5acdf SH	179	if (p->name[0])
aba5acdf SH	180	duparg2("name", *argv);
625df645 PS	181	if (get_ifname(p->name, *argv))
625df645 PS	182	invarg("\"name\" not a valid ifname", *argv);
aba5acdf	183	if (cmd == SIOCCHGTUNNEL && count == 0) {
d17b136f	184	struct ip_tunnel_parm old_p = {};
a96a5d94	185
d9bd1bd9	186	if (tnl_get_ioctl(*argv, &old_p))
aba5acdf SH	187	return -1;
	188	*p = old_p;
	189	}
	190	}
	191	count++;
	192	argc--; argv++;
	193	}
	194
	195
	196	if (p->iph.protocol == 0) {
	197	if (memcmp(p->name, "gre", 3) == 0)
	198	p->iph.protocol = IPPROTO_GRE;
	199	else if (memcmp(p->name, "ipip", 4) == 0)
	200	p->iph.protocol = IPPROTO_IPIP;
	201	else if (memcmp(p->name, "sit", 3) == 0)
	202	p->iph.protocol = IPPROTO_IPV6;
0bd17929 TF	203	else if (memcmp(p->name, "isatap", 6) == 0) {
	204	p->iph.protocol = IPPROTO_IPV6;
	205	isatap++;
eec47608 SM	206	} else if (memcmp(p->name, "vti", 3) == 0) {
	207	p->iph.protocol = IPPROTO_IPIP;
	208	p->i_flags \|= VTI_ISVTI;
0bd17929	209	}
aba5acdf SH	210	}
aba5acdf SH	211
1c28bd59 HL	212	if ((p->i_flags & GRE_KEY) \|\| (p->o_flags & GRE_KEY)) {
	213	if (!(p->i_flags & VTI_ISVTI) &&
	214	(p->iph.protocol != IPPROTO_GRE)) {
14645ec2	215	fprintf(stderr, "Keys are not allowed with ipip and sit tunnels\n");
aba5acdf SH	216	return -1;
	217	}
	218	}
	219
26111ab1	220	if (medium) {
4b3cb962	221	p->link = ll_name_to_index(medium);
0cb6bb51	222	if (p->link == 0) {
6ddb1e8c	223	fprintf(stderr, "Cannot find device \"%s\"\n", medium);
aba5acdf	224	return -1;
0cb6bb51	225	}
aba5acdf SH	226	}
	227
	228	if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
	229	p->i_key = p->iph.daddr;
	230	p->i_flags \|= GRE_KEY;
	231	}
	232	if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
	233	p->o_key = p->iph.daddr;
	234	p->o_flags \|= GRE_KEY;
	235	}
	236	if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
14645ec2	237	fprintf(stderr, "A broadcast tunnel requires a source address\n");
aba5acdf SH	238	return -1;
aba5acdf SH	239	}
eeef12c5	240	if (isatap)
0bd17929	241	p->i_flags \|= SIT_ISATAP;
0bd17929	242
aba5acdf SH	243	return 0;
	244	}
	245
c957821b PS	246	static const char tnl_defname(const struct ip_tunnel_parm p)
	247	{
	248	switch (p->iph.protocol) {
	249	case IPPROTO_IPIP:
	250	if (p->i_flags & VTI_ISVTI)
	251	return "ip_vti0";
	252	else
	253	return "tunl0";
	254	case IPPROTO_GRE:
	255	return "gre0";
	256	case IPPROTO_IPV6:
	257	return "sit0";
	258	}
	259	return NULL;
	260	}
aba5acdf SH	261
	262	static int do_add(int cmd, int argc, char **argv)
	263	{
	264	struct ip_tunnel_parm p;
c957821b	265	const char *basedev;
aba5acdf SH	266
	267	if (parse_args(argc, argv, cmd, &p) < 0)
	268	return -1;
	269
	270	if (p.iph.ttl && p.iph.frag_off == 0) {
30d07e9e	271	fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n");
aba5acdf SH	272	return -1;
	273	}
	274
a96a5d94 SH	275	basedev = tnl_defname(&p);
	276	if (!basedev) {
	277	fprintf(stderr,
	278	"cannot determine tunnel mode (ipip, gre, vti or sit)\n");
aba5acdf SH	279	return -1;
aba5acdf SH	280	}
c957821b PS	281
c957821b PS	282	return tnl_add_ioctl(cmd, basedev, p.name, &p);
aba5acdf SH	283	}
aba5acdf SH	284
d9bd1bd9	285	static int do_del(int argc, char **argv)
aba5acdf SH	286	{
	287	struct ip_tunnel_parm p;
	288
	289	if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
	290	return -1;
	291
c957821b	292	return tnl_del_ioctl(tnl_defname(&p) ? : p.name, p.name, &p);
aba5acdf SH	293	}
aba5acdf SH	294
d9bd1bd9	295	static void print_tunnel(struct ip_tunnel_parm *p)
aba5acdf	296	{
d17b136f	297	struct ip_tunnel_6rd ip6rd = {};
aba5acdf SH	298	char s1[1024];
aba5acdf SH	299	char s2[1024];
aba5acdf	300
aba5acdf SH	301	/* Do not use format_host() for local addr,
	302	* symbolic name will not be useful.
	303	*/
8de592d0	304	printf("%s: %s/ip remote %s local %s",
aba5acdf	305	p->name,
d9bd1bd9	306	tnl_strproto(p->iph.protocol),
a418e451	307	p->iph.daddr ? format_host_r(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any",
2e96d2cc	308	p->iph.saddr ? rt_addr_n2a_r(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");
aba5acdf	309
86c00faa	310	if (p->iph.protocol == IPPROTO_IPV6 && (p->i_flags & SIT_ISATAP)) {
d17b136f	311	struct ip_tunnel_prl prl[16] = {};
a07e9912	312	int i;
0612519e	313
a07e9912 SH	314	prl[0].datalen = sizeof(prl) - sizeof(prl[0]);
a07e9912 SH	315	prl[0].addr = htonl(INADDR_ANY);
0612519e	316
a07e9912	317	if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl))
a96a5d94 SH	318	for (i = 1; i < ARRAY_SIZE(prl); i++) {
	319	if (prl[i].addr != htonl(INADDR_ANY)) {
	320	printf(" %s %s ",
	321	(prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr",
a418e451	322	format_host(AF_INET, 4, &prl[i].addr));
a96a5d94	323	}
a07e9912	324	}
a07e9912 SH	325	}
a07e9912 SH	326
aba5acdf	327	if (p->link) {
ea71beac	328	const char *n = ll_index_to_name(p->link);
a96a5d94	329
aba5acdf	330	if (n)
8de592d0	331	printf(" dev %s", n);
aba5acdf SH	332	}
	333
	334	if (p->iph.ttl)
8de592d0	335	printf(" ttl %d", p->iph.ttl);
aba5acdf	336	else
8de592d0	337	printf(" ttl inherit");
ae665a52	338
aba5acdf SH	339	if (p->iph.tos) {
	340	SPRINT_BUF(b1);
	341	printf(" tos");
04ce8d3e	342	if (p->iph.tos & 1)
aba5acdf	343	printf(" inherit");
04ce8d3e PS	344	if (p->iph.tos & ~1)
	345	printf("%c%s ", p->iph.tos & 1 ? '/' : ' ',
	346	rtnl_dsfield_n2a(p->iph.tos & ~1, b1, sizeof(b1)));
aba5acdf SH	347	}
aba5acdf SH	348
04ce8d3e	349	if (!(p->iph.frag_off & htons(IP_DF)))
aba5acdf SH	350	printf(" nopmtudisc");
aba5acdf SH	351
3979ef91	352	if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) {
8de592d0	353	printf(" 6rd-prefix %s/%u",
b88215c4 AC	354	inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)),
	355	ip6rd.prefixlen);
	356	if (ip6rd.relay_prefix) {
8de592d0	357	printf(" 6rd-relay_prefix %s/%u",
a418e451	358	format_host(AF_INET, 4, &ip6rd.relay_prefix),
b88215c4 AC	359	ip6rd.relay_prefixlen);
	360	}
	361	}
	362
04ce8d3e	363	if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) && p->o_key == p->i_key)
6f4f7c46	364	printf(" key %u", ntohl(p->i_key));
04ce8d3e PS	365	else if ((p->i_flags \| p->o_flags) & GRE_KEY) {
04ce8d3e PS	366	if (p->i_flags & GRE_KEY)
8de592d0	367	printf(" ikey %u", ntohl(p->i_key));
04ce8d3e	368	if (p->o_flags & GRE_KEY)
8de592d0	369	printf(" okey %u", ntohl(p->o_key));
aba5acdf SH	370	}
aba5acdf SH	371
04ce8d3e	372	if (p->i_flags & GRE_SEQ)
4cb8d030	373	printf("%s Drop packets out of sequence.", _SL_);
04ce8d3e	374	if (p->i_flags & GRE_CSUM)
aba5acdf	375	printf("%s Checksum in received packet is required.", _SL_);
04ce8d3e	376	if (p->o_flags & GRE_SEQ)
aba5acdf	377	printf("%s Sequence packets on output.", _SL_);
04ce8d3e	378	if (p->o_flags & GRE_CSUM)
aba5acdf SH	379	printf("%s Checksum output packets.", _SL_);
	380	}
	381
	382	static int do_tunnels_list(struct ip_tunnel_parm *p)
	383	{
aba5acdf	384	char buf[512];
c4527d7b	385	int err = -1;
aba5acdf	386	FILE *fp = fopen("/proc/net/dev", "r");
a96a5d94	387
aba5acdf SH	388	if (fp == NULL) {
	389	perror("fopen");
	390	return -1;
	391	}
	392
38c867d2 SH	393	/* skip header lines */
	394	if (!fgets(buf, sizeof(buf), fp) \|\|
	395	!fgets(buf, sizeof(buf), fp)) {
	396	fprintf(stderr, "/proc/net/dev read error\n");
c4527d7b	397	goto end;
38c867d2	398	}
aba5acdf SH	399
aba5acdf SH	400	while (fgets(buf, sizeof(buf), fp) != NULL) {
c4527d7b	401	char name[IFNAMSIZ];
ea71beac	402	int index, type;
d17b136f	403	struct ip_tunnel_parm p1 = {};
aba5acdf	404	char *ptr;
c4527d7b	405
aba5acdf	406	buf[sizeof(buf) - 1] = 0;
a96a5d94 SH	407	ptr = strchr(buf, ':');
a96a5d94 SH	408	if (ptr == NULL \|\|
aba5acdf	409	(*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
14645ec2	410	fprintf(stderr, "Wrong format for /proc/net/dev. Giving up.\n");
c4527d7b	411	goto end;
aba5acdf	412	}
aba5acdf SH	413	if (p->name[0] && strcmp(p->name, name))
aba5acdf SH	414	continue;
ea71beac SH	415	index = ll_name_to_index(name);
	416	if (index == 0)
	417	continue;
	418	type = ll_index_to_type(index);
aba5acdf	419	if (type == -1) {
14645ec2	420	fprintf(stderr, "Failed to get type of \"%s\"\n", name);
aba5acdf SH	421	continue;
	422	}
	423	if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
	424	continue;
d9bd1bd9	425	if (tnl_get_ioctl(name, &p1))
aba5acdf SH	426	continue;
	427	if ((p->link && p1.link != p->link) \|\|
	428	(p->name[0] && strcmp(p1.name, p->name)) \|\|
	429	(p->iph.daddr && p1.iph.daddr != p->iph.daddr) \|\|
	430	(p->iph.saddr && p1.iph.saddr != p->iph.saddr) \|\|
	431	(p->i_key && p1.i_key != p->i_key))
	432	continue;
	433	print_tunnel(&p1);
7d6aadcd PS	434	if (show_stats)
7d6aadcd PS	435	tnl_print_stats(ptr);
aba5acdf SH	436	printf("\n");
aba5acdf SH	437	}
c4527d7b PS	438	err = 0;
c4527d7b PS	439	end:
297452a1	440	fclose(fp);
c4527d7b	441	return err;
aba5acdf SH	442	}
	443
	444	static int do_show(int argc, char **argv)
	445	{
aba5acdf	446	struct ip_tunnel_parm p;
c957821b	447	const char *basedev;
aba5acdf	448
ea71beac	449	ll_init_map(&rth);
aba5acdf SH	450	if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
	451	return -1;
	452
a96a5d94 SH	453	basedev = tnl_defname(&p);
a96a5d94 SH	454	if (!basedev)
c957821b PS	455	return do_tunnels_list(&p);
	456
	457	if (tnl_get_ioctl(p.name[0] ? p.name : basedev, &p))
aba5acdf SH	458	return -1;
	459
	460	print_tunnel(&p);
	461	printf("\n");
	462	return 0;
	463	}
	464
a07e9912 SH	465	static int do_prl(int argc, char **argv)
a07e9912 SH	466	{
d17b136f	467	struct ip_tunnel_prl p = {};
a07e9912	468	int count = 0;
a07e9912	469	int cmd = 0;
26111ab1	470	const char *medium = NULL;
a07e9912 SH	471
	472	while (argc > 0) {
	473	if (strcmp(*argv, "prl-default") == 0) {
	474	NEXT_ARG();
	475	cmd = SIOCADDPRL;
	476	p.addr = get_addr32(*argv);
	477	p.flags \|= PRL_DEFAULT;
	478	count++;
	479	} else if (strcmp(*argv, "prl-nodefault") == 0) {
	480	NEXT_ARG();
	481	cmd = SIOCADDPRL;
	482	p.addr = get_addr32(*argv);
	483	count++;
	484	} else if (strcmp(*argv, "prl-delete") == 0) {
	485	NEXT_ARG();
	486	cmd = SIOCDELPRL;
	487	p.addr = get_addr32(*argv);
	488	count++;
	489	} else if (strcmp(*argv, "dev") == 0) {
	490	NEXT_ARG();
625df645 PS	491	if (check_ifname(*argv))
625df645 PS	492	invarg("\"dev\" not a valid ifname", *argv);
26111ab1	493	medium = *argv;
a07e9912	494	} else {
a96a5d94 SH	495	fprintf(stderr,
a96a5d94 SH	496	"Invalid PRL parameter \"%s\"\n", *argv);
a07e9912 SH	497	exit(-1);
	498	}
	499	if (count > 1) {
a96a5d94 SH	500	fprintf(stderr,
a96a5d94 SH	501	"One PRL entry at a time\n");
a07e9912 SH	502	exit(-1);
	503	}
	504	argc--; argv++;
	505	}
26111ab1	506	if (!medium) {
14645ec2	507	fprintf(stderr, "Must specify device\n");
a07e9912 SH	508	exit(-1);
	509	}
	510
	511	return tnl_prl_ioctl(cmd, medium, &p);
	512	}
	513
b88215c4 AC	514	static int do_6rd(int argc, char **argv)
b88215c4 AC	515	{
d17b136f	516	struct ip_tunnel_6rd ip6rd = {};
b88215c4	517	int cmd = 0;
26111ab1	518	const char *medium = NULL;
b88215c4 AC	519	inet_prefix prefix;
b88215c4 AC	520
b88215c4 AC	521	while (argc > 0) {
	522	if (strcmp(*argv, "6rd-prefix") == 0) {
	523	NEXT_ARG();
	524	if (get_prefix(&prefix, *argv, AF_INET6))
	525	invarg("invalid 6rd_prefix\n", *argv);
	526	cmd = SIOCADD6RD;
	527	memcpy(&ip6rd.prefix, prefix.data, 16);
	528	ip6rd.prefixlen = prefix.bitlen;
	529	} else if (strcmp(*argv, "6rd-relay_prefix") == 0) {
	530	NEXT_ARG();
	531	if (get_prefix(&prefix, *argv, AF_INET))
	532	invarg("invalid 6rd-relay_prefix\n", *argv);
	533	cmd = SIOCADD6RD;
	534	memcpy(&ip6rd.relay_prefix, prefix.data, 4);
	535	ip6rd.relay_prefixlen = prefix.bitlen;
	536	} else if (strcmp(*argv, "6rd-reset") == 0) {
	537	cmd = SIOCDEL6RD;
	538	} else if (strcmp(*argv, "dev") == 0) {
	539	NEXT_ARG();
625df645 PS	540	if (check_ifname(*argv))
625df645 PS	541	invarg("\"dev\" not a valid ifname", *argv);
26111ab1	542	medium = *argv;
b88215c4	543	} else {
a96a5d94 SH	544	fprintf(stderr,
a96a5d94 SH	545	"Invalid 6RD parameter \"%s\"\n", *argv);
b88215c4 AC	546	exit(-1);
	547	}
	548	argc--; argv++;
	549	}
26111ab1	550	if (!medium) {
14645ec2	551	fprintf(stderr, "Must specify device\n");
b88215c4 AC	552	exit(-1);
	553	}
	554
	555	return tnl_6rd_ioctl(cmd, medium, &ip6rd);
	556	}
	557
a96a5d94 SH	558	static int tunnel_mode_is_ipv6(char *tunnel_mode)
	559	{
	560	static const char * const ipv6_modes[] = {
cc9c1dfa KS	561	"ipv6/ipv6", "ip6ip6",
	562	"vti6",
	563	"ip/ipv6", "ipv4/ipv6", "ipip6", "ip4ip6",
	564	"ip6gre", "gre/ipv6",
	565	"any/ipv6", "any"
	566	};
	567	int i;
	568
a96a5d94	569	for (i = 0; i < ARRAY_SIZE(ipv6_modes); i++) {
cc9c1dfa KS	570	if (strcmp(ipv6_modes[i], tunnel_mode) == 0)
	571	return 1;
	572	}
	573	return 0;
	574	}
	575
aba5acdf SH	576	int do_iptunnel(int argc, char **argv)
aba5acdf SH	577	{
cc9c1dfa KS	578	int i;
	579
	580	for (i = 0; i < argc - 1; i++) {
	581	if (strcmp(argv[i], "mode") == 0) {
	582	if (tunnel_mode_is_ipv6(argv[i + 1]))
	583	preferred_family = AF_INET6;
	584	break;
	585	}
	586	}
d9bd1bd9 MN	587	switch (preferred_family) {
	588	case AF_UNSPEC:
	589	preferred_family = AF_INET;
	590	break;
	591	case AF_INET:
	592	break;
288384f2 MN	593	/*
	594	* This is silly enough but we have no easy way to make it
	595	* protocol-independent because of unarranged structure between
	596	* IPv4 and IPv6.
	597	*/
	598	case AF_INET6:
	599	return do_ip6tunnel(argc, argv);
d9bd1bd9	600	default:
14645ec2	601	fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
d9bd1bd9 MN	602	exit(-1);
	603	}
	604
aba5acdf SH	605	if (argc > 0) {
aba5acdf SH	606	if (matches(*argv, "add") == 0)
04ce8d3e	607	return do_add(SIOCADDTUNNEL, argc - 1, argv + 1);
aba5acdf	608	if (matches(*argv, "change") == 0)
04ce8d3e	609	return do_add(SIOCCHGTUNNEL, argc - 1, argv + 1);
6e30461e	610	if (matches(*argv, "delete") == 0)
04ce8d3e	611	return do_del(argc - 1, argv + 1);
aba5acdf SH	612	if (matches(*argv, "show") == 0 \|\|
	613	matches(*argv, "lst") == 0 \|\|
	614	matches(*argv, "list") == 0)
04ce8d3e	615	return do_show(argc - 1, argv + 1);
a07e9912	616	if (matches(*argv, "prl") == 0)
04ce8d3e	617	return do_prl(argc - 1, argv + 1);
b88215c4	618	if (matches(*argv, "6rd") == 0)
04ce8d3e	619	return do_6rd(argc - 1, argv + 1);
aba5acdf SH	620	if (matches(*argv, "help") == 0)
	621	usage();
	622	} else
	623	return do_show(0, NULL);
	624
14645ec2	625	fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\"\n", *argv);
aba5acdf SH	626	exit(-1);
aba5acdf SH	627	}