/*
* Copyright (C)2006 USAGI/WIDE Project
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses>.
*/
/*
* Author:
* Masahide NAKAMURA @USAGI
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <linux/ip.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_tunnel.h>
#include <linux/ip6_tunnel.h>
#include "utils.h"
#include "tunnel.h"
#include "ip_common.h"
#define IP6_FLOWINFO_TCLASS htonl(0x0FF00000)
#define IP6_FLOWINFO_FLOWLABEL htonl(0x000FFFFF)
#define DEFAULT_TNL_HOP_LIMIT (64)
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr,
"Usage: ip -f inet6 tunnel { add | change | del | show } [ NAME ]\n"
" [ mode { ip6ip6 | ipip6 | ip6gre | vti6 | any } ]\n"
" [ remote ADDR local ADDR ] [ dev PHYS_DEV ]\n"
" [ encaplimit ELIM ]\n"
" [ hoplimit TTL ] [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n"
" [ dscp inherit ]\n"
" [ [no]allow-localremote ]\n"
" [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"
"\n"
"Where: NAME := STRING\n"
" ADDR := IPV6_ADDRESS\n"
" ELIM := { none | 0..255 }(default=%d)\n"
" TTL := 0..255 (default=%d)\n"
" TCLASS := { 0x0..0xff | inherit }\n"
" FLOWLABEL := { 0x0..0xfffff | inherit }\n"
" KEY := { DOTTED_QUAD | NUMBER }\n",
IPV6_DEFAULT_TNL_ENCAP_LIMIT,
DEFAULT_TNL_HOP_LIMIT);
exit(-1);
}
static void print_tunnel(const void *t)
{
const struct ip6_tnl_parm2 *p = t;
SPRINT_BUF(b1);
/* Do not use format_host() for local addr,
* symbolic name will not be useful.
*/
open_json_object(NULL);
print_color_string(PRINT_ANY, COLOR_IFNAME, "ifname", "%s: ", p->name);
snprintf(b1, sizeof(b1), "%s/ipv6", tnl_strproto(p->proto));
print_string(PRINT_ANY, "mode", "%s ", b1);
print_string(PRINT_FP, NULL, "%s", "remote ");
print_color_string(PRINT_ANY, COLOR_INET6, "remote", "%s ",
format_host_r(AF_INET6, 16, &p->raddr, b1, sizeof(b1)));
print_string(PRINT_FP, NULL, "%s", "local ");
print_color_string(PRINT_ANY, COLOR_INET6, "local", "%s",
rt_addr_n2a_r(AF_INET6, 16, &p->laddr, b1, sizeof(b1)));
if (p->link) {
const char *n = ll_index_to_name(p->link);
if (n)
print_string(PRINT_ANY, "link", " dev %s", n);
}
if (p->flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
print_null(PRINT_ANY, "ip6_tnl_f_ign_encap_limit",
" encaplimit none", NULL);
else
print_uint(PRINT_ANY, "encap_limit", " encaplimit %u",
p->encap_limit);
if (p->hop_limit)
print_uint(PRINT_ANY, "hoplimit", " hoplimit %u", p->hop_limit);
else
print_string(PRINT_FP, "hoplimit", " hoplimit %s", "inherit");
if (p->flags & IP6_TNL_F_USE_ORIG_TCLASS) {
print_null(PRINT_ANY, "ip6_tnl_f_use_orig_tclass",
" tclass inherit", NULL);
} else {
__u32 val = ntohl(p->flowinfo & IP6_FLOWINFO_TCLASS);
snprintf(b1, sizeof(b1), "0x%02x", (__u8)(val >> 20));
print_string(PRINT_ANY, "tclass", " tclass %s", b1);
}
if (p->flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) {
print_null(PRINT_ANY, "ip6_tnl_f_use_orig_flowlabel",
" flowlabel inherit", NULL);
} else {
__u32 val = ntohl(p->flowinfo & IP6_FLOWINFO_FLOWLABEL);
snprintf(b1, sizeof(b1), "0x%05x", val);
print_string(PRINT_ANY, "flowlabel", " flowlabel %s", b1);
}
snprintf(b1, sizeof(b1), "0x%08x", ntohl(p->flowinfo));
print_string(PRINT_ANY, "flowinfo", " (flowinfo %s)", b1);
if (p->flags & IP6_TNL_F_RCV_DSCP_COPY)
print_null(PRINT_ANY, "ip6_tnl_f_rcv_dscp_copy",
" dscp inherit", NULL);
if (p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE)
print_null(PRINT_ANY, "ip6_tnl_f_allow_local_remote",
" allow-localremote", NULL);
tnl_print_gre_flags(p->proto, p->i_flags, p->o_flags,
p->i_key, p->o_key);
close_json_object();
}
static int parse_args(int argc, char **argv, int cmd, struct ip6_tnl_parm2 *p)
{
int count = 0;
const char *medium = NULL;
while (argc > 0) {
if (strcmp(*argv, "mode") == 0) {
NEXT_ARG();
if (strcmp(*argv, "ipv6/ipv6") == 0 ||
strcmp(*argv, "ip6ip6") == 0)
p->proto = IPPROTO_IPV6;
else if (strcmp(*argv, "vti6") == 0) {
p->proto = IPPROTO_IPV6;
p->i_flags |= VTI_ISVTI;
} else if (strcmp(*argv, "ip/ipv6") == 0 ||
strcmp(*argv, "ipv4/ipv6") == 0 ||
strcmp(*argv, "ipip6") == 0 ||
strcmp(*argv, "ip4ip6") == 0)
p->proto = IPPROTO_IPIP;
else if (strcmp(*argv, "ip6gre") == 0 ||
strcmp(*argv, "gre/ipv6") == 0)
p->proto = IPPROTO_GRE;
else if (strcmp(*argv, "any/ipv6") == 0 ||
strcmp(*argv, "any") == 0)
p->proto = 0;
else {
fprintf(stderr, "Unknown tunnel mode \"%s\"\n", *argv);
exit(-1);
}
} else if (strcmp(*argv, "remote") == 0) {
inet_prefix raddr;
NEXT_ARG();
get_addr(&raddr, *argv, AF_INET6);
memcpy(&p->raddr, &raddr.data, sizeof(p->raddr));
} else if (strcmp(*argv, "local") == 0) {
inet_prefix laddr;
NEXT_ARG();
get_addr(&laddr, *argv, AF_INET6);
memcpy(&p->laddr, &laddr.data, sizeof(p->laddr));
} else if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
medium = *argv;
} else if (strcmp(*argv, "encaplimit") == 0) {
NEXT_ARG();
if (strcmp(*argv, "none") == 0) {
p->flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
} else {
__u8 uval;
if (get_u8(&uval, *argv, 0) < -1)
invarg("invalid ELIM", *argv);
p->encap_limit = uval;
p->flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
}
} else if (strcmp(*argv, "hoplimit") == 0 ||
strcmp(*argv, "ttl") == 0 ||
strcmp(*argv, "hlim") == 0) {
__u8 uval;
NEXT_ARG();
if (get_u8(&uval, *argv, 0))
invarg("invalid TTL", *argv);
p->hop_limit = uval;
} else if (strcmp(*argv, "tclass") == 0 ||
strcmp(*argv, "tc") == 0 ||
strcmp(*argv, "tos") == 0 ||
matches(*argv, "dsfield") == 0) {
__u8 uval;
NEXT_ARG();
p->flowinfo &= ~IP6_FLOWINFO_TCLASS;
if (strcmp(*argv, "inherit") == 0)
p->flags |= IP6_TNL_F_USE_ORIG_TCLASS;
else {
if (get_u8(&uval, *argv, 16))
invarg("invalid TClass", *argv);
p->flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
p->flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
}
} else if (strcmp(*argv, "flowlabel") == 0 ||
strcmp(*argv, "fl") == 0) {
__u32 uval;
NEXT_ARG();
p->flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
if (strcmp(*argv, "inherit") == 0)
p->flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
else {
if (get_u32(&uval, *argv, 16))
invarg("invalid Flowlabel", *argv);
if (uval > 0xFFFFF)
invarg("invalid Flowlabel", *argv);
p->flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
p->flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
}
} else if (strcmp(*argv, "dscp") == 0) {
NEXT_ARG();
if (strcmp(*argv, "inherit") != 0)
invarg("not inherit", *argv);
p->flags |= IP6_TNL_F_RCV_DSCP_COPY;
} else if (strcmp(*argv, "allow-localremote") == 0) {
p->flags |= IP6_TNL_F_ALLOW_LOCAL_REMOTE;
} else if (strcmp(*argv, "noallow-localremote") == 0) {
p->flags &= ~IP6_TNL_F_ALLOW_LOCAL_REMOTE;
} 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, "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 ip6_tnl_parm2 old_p = {};
if (tnl_get_ioctl(*argv, &old_p))
return -1;
*p = old_p;
}
}
count++;
argc--; argv++;
}
if (medium) {
p->link = ll_name_to_index(medium);
if (!p->link)
return nodev(medium);
}
return 0;
}
static void ip6_tnl_parm_init(struct ip6_tnl_parm2 *p, int apply_default)
{
memset(p, 0, sizeof(*p));
p->proto = IPPROTO_IPV6;
if (apply_default) {
p->hop_limit = DEFAULT_TNL_HOP_LIMIT;
p->encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
}
}
static void ip6_tnl_parm_initialize(const struct tnl_print_nlmsg_info *info)
{
const struct ifinfomsg *ifi = info->ifi;
const struct ip6_tnl_parm2 *p1 = info->p1;
struct ip6_tnl_parm2 *p2 = info->p2;
ip6_tnl_parm_init(p2, 0);
if (ifi->ifi_type == ARPHRD_IP6GRE)
p2->proto = IPPROTO_GRE;
p2->link = ifi->ifi_index;
strcpy(p2->name, p1->name);
}
static bool ip6_tnl_parm_match(const struct tnl_print_nlmsg_info *info)
{
const struct ip6_tnl_parm2 *p1 = info->p1;
const struct ip6_tnl_parm2 *p2 = info->p2;
return ((!p1->link || p1->link == p2->link) &&
(!p1->name[0] || strcmp(p1->name, p2->name) == 0) &&
(IN6_IS_ADDR_UNSPECIFIED(&p1->laddr) ||
IN6_ARE_ADDR_EQUAL(&p1->laddr, &p2->laddr)) &&
(IN6_IS_ADDR_UNSPECIFIED(&p1->raddr) ||
IN6_ARE_ADDR_EQUAL(&p1->raddr, &p2->raddr)) &&
(!p1->proto || !p2->proto || p1->proto == p2->proto) &&
(!p1->encap_limit || p1->encap_limit == p2->encap_limit) &&
(!p1->hop_limit || p1->hop_limit == p2->hop_limit) &&
(!(p1->flowinfo & IP6_FLOWINFO_TCLASS) ||
!((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_TCLASS)) &&
(!(p1->flowinfo & IP6_FLOWINFO_FLOWLABEL) ||
!((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_FLOWLABEL)) &&
(!p1->flags || (p1->flags & p2->flags)));
}
static int do_show(int argc, char **argv)
{
struct ip6_tnl_parm2 p, p1;
ip6_tnl_parm_init(&p, 0);
p.proto = 0; /* default to any */
if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
return -1;
if (!p.name[0] || show_stats) {
struct tnl_print_nlmsg_info info = {
.p1 = &p,
.p2 = &p1,
.init = ip6_tnl_parm_initialize,
.match = ip6_tnl_parm_match,
.print = print_tunnel,
};
return do_tunnels_list(&info);
}
if (tnl_get_ioctl(p.name, &p))
return -1;
print_tunnel(&p);
return 0;
}
static int do_add(int cmd, int argc, char **argv)
{
struct ip6_tnl_parm2 p;
const char *basedev = "ip6tnl0";
ip6_tnl_parm_init(&p, 1);
if (parse_args(argc, argv, cmd, &p) < 0)
return -1;
if (!*p.name)
fprintf(stderr, "Tunnel interface name not specified\n");
if (p.proto == IPPROTO_GRE)
basedev = "ip6gre0";
else if (p.i_flags & VTI_ISVTI)
basedev = "ip6_vti0";
return tnl_add_ioctl(cmd, basedev, p.name, &p);
}
static int do_del(int argc, char **argv)
{
struct ip6_tnl_parm2 p;
const char *basedev = "ip6tnl0";
ip6_tnl_parm_init(&p, 1);
if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
return -1;
if (p.proto == IPPROTO_GRE)
basedev = "ip6gre0";
else if (p.i_flags & VTI_ISVTI)
basedev = "ip6_vti0";
return tnl_del_ioctl(basedev, p.name, &p);
}
int do_ip6tunnel(int argc, char **argv)
{
switch (preferred_family) {
case AF_UNSPEC:
preferred_family = AF_INET6;
break;
case AF_INET6:
break;
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, "help") == 0)
usage();
} else
return do_show(0, NULL);
fprintf(stderr, "Command \"%s\" is unknown, try \"ip -f inet6 tunnel help\".\n", *argv);
exit(-1);
}