1/*
2 * Copyright (C)2006 USAGI/WIDE Project
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
17 */
18/*
19 * split from ip_tunnel.c
20 */
21/*
22 * Author:
23 *	Masahide NAKAMURA @USAGI
24 */
25
26#include <stdio.h>
27#include <string.h>
28#include <unistd.h>
29#include <errno.h>
30#include <sys/types.h>
31#include <sys/socket.h>
32#include <sys/ioctl.h>
33#include <netinet/in.h>
34#include <linux/if.h>
35#include <linux/ip.h>
36#include <linux/if_tunnel.h>
37
38#include "utils.h"
39#include "tunnel.h"
40
41const char *tnl_strproto(__u8 proto)
42{
43	static char buf[16];
44
45	switch (proto) {
46	case IPPROTO_IPIP:
47		strcpy(buf, "ip");
48		break;
49	case IPPROTO_GRE:
50		strcpy(buf, "gre");
51		break;
52	case IPPROTO_IPV6:
53		strcpy(buf, "ipv6");
54		break;
55	case 0:
56		strcpy(buf, "any");
57		break;
58	default:
59		strcpy(buf, "unknown");
60		break;
61	}
62
63	return buf;
64}
65
66int tnl_ioctl_get_ifindex(const char *dev)
67{
68	struct ifreq ifr;
69	int fd;
70	int err;
71
72	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
73	fd = socket(preferred_family, SOCK_DGRAM, 0);
74	err = ioctl(fd, SIOCGIFINDEX, &ifr);
75	if (err) {
76		perror("ioctl");
77		return 0;
78	}
79	close(fd);
80	return ifr.ifr_ifindex;
81}
82
83int tnl_ioctl_get_iftype(const char *dev)
84{
85	struct ifreq ifr;
86	int fd;
87	int err;
88
89	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
90	fd = socket(preferred_family, SOCK_DGRAM, 0);
91	err = ioctl(fd, SIOCGIFHWADDR, &ifr);
92	if (err) {
93		perror("ioctl");
94		return -1;
95	}
96	close(fd);
97	return ifr.ifr_addr.sa_family;
98}
99
100
101char * tnl_ioctl_get_ifname(int idx)
102{
103	static struct ifreq ifr;
104	int fd;
105	int err;
106
107	ifr.ifr_ifindex = idx;
108	fd = socket(preferred_family, SOCK_DGRAM, 0);
109	err = ioctl(fd, SIOCGIFNAME, &ifr);
110	if (err) {
111		perror("ioctl");
112		return NULL;
113	}
114	close(fd);
115	return ifr.ifr_name;
116}
117
118int tnl_get_ioctl(const char *basedev, void *p)
119{
120	struct ifreq ifr;
121	int fd;
122	int err;
123
124	strncpy(ifr.ifr_name, basedev, IFNAMSIZ);
125	ifr.ifr_ifru.ifru_data = (void*)p;
126	fd = socket(preferred_family, SOCK_DGRAM, 0);
127	err = ioctl(fd, SIOCGETTUNNEL, &ifr);
128	if (err)
129		perror("ioctl");
130	close(fd);
131	return err;
132}
133
134int tnl_add_ioctl(int cmd, const char *basedev, const char *name, void *p)
135{
136	struct ifreq ifr;
137	int fd;
138	int err;
139
140	if (cmd == SIOCCHGTUNNEL && name[0])
141		strncpy(ifr.ifr_name, name, IFNAMSIZ);
142	else
143		strncpy(ifr.ifr_name, basedev, IFNAMSIZ);
144	ifr.ifr_ifru.ifru_data = p;
145	fd = socket(preferred_family, SOCK_DGRAM, 0);
146	err = ioctl(fd, cmd, &ifr);
147	if (err)
148		perror("ioctl");
149	close(fd);
150	return err;
151}
152
153int tnl_del_ioctl(const char *basedev, const char *name, void *p)
154{
155	struct ifreq ifr;
156	int fd;
157	int err;
158
159	if (name[0])
160		strncpy(ifr.ifr_name, name, IFNAMSIZ);
161	else
162		strncpy(ifr.ifr_name, basedev, IFNAMSIZ);
163	ifr.ifr_ifru.ifru_data = p;
164	fd = socket(preferred_family, SOCK_DGRAM, 0);
165	err = ioctl(fd, SIOCDELTUNNEL, &ifr);
166	if (err)
167		perror("ioctl");
168	close(fd);
169	return err;
170}
171
172#ifndef NO_IPV6
173static int tnl_gen_ioctl(int cmd, const char *name, void *p, int skiperr)
174{
175	struct ifreq ifr;
176	int fd;
177	int err;
178
179	strncpy(ifr.ifr_name, name, IFNAMSIZ);
180	ifr.ifr_ifru.ifru_data = p;
181	fd = socket(preferred_family, SOCK_DGRAM, 0);
182	err = ioctl(fd, cmd, &ifr);
183	if (err && errno != skiperr)
184		perror("ioctl");
185	close(fd);
186	return err;
187}
188
189int tnl_6rd_ioctl(int cmd, const char *name, void *p)
190{
191	return tnl_gen_ioctl(cmd, name, p, -1);
192}
193
194int tnl_ioctl_get_6rd(const char *name, void *p)
195{
196	return tnl_gen_ioctl(SIOCGET6RD, name, p, EINVAL);
197}
198#endif	// NO_IPV6
199