tunnel.c revision a7ed1520ee9645e31b94caf72cad47be31856745 
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, see <http://www.gnu.org/licenses>.
16 */
17/*
18 * split from ip_tunnel.c
19 */
20/*
21 * Author:
22 *	Masahide NAKAMURA @USAGI
23 */
24
25#include <stdio.h>
26#include <string.h>
27#include <unistd.h>
28#include <errno.h>
29#include <sys/types.h>
30#include <sys/socket.h>
31#include <sys/ioctl.h>
32#include <netinet/in.h>
33#include <linux/if.h>
34#include <linux/ip.h>
35#include <linux/if_tunnel.h>
36
37#include "utils.h"
38#include "tunnel.h"
39
40const char *tnl_strproto(__u8 proto)
41{
42	static char buf[16];
43
44	switch (proto) {
45	case IPPROTO_IPIP:
46		strcpy(buf, "ip");
47		break;
48	case IPPROTO_GRE:
49		strcpy(buf, "gre");
50		break;
51	case IPPROTO_IPV6:
52		strcpy(buf, "ipv6");
53		break;
54	case IPPROTO_ESP:
55		strcpy(buf, "esp");
56		break;
57	case 0:
58		strcpy(buf, "any");
59		break;
60	default:
61		strcpy(buf, "unknown");
62		break;
63	}
64
65	return buf;
66}
67
68int tnl_get_ioctl(const char *basedev, void *p)
69{
70	struct ifreq ifr;
71	int fd;
72	int err;
73
74	strncpy(ifr.ifr_name, basedev, IFNAMSIZ);
75	ifr.ifr_ifru.ifru_data = (void*)p;
76
77	fd = socket(preferred_family, SOCK_DGRAM, 0);
78	if (fd < 0) {
79		fprintf(stderr, "create socket failed: %s\n", strerror(errno));
80		return -1;
81	}
82
83	err = ioctl(fd, SIOCGETTUNNEL, &ifr);
84	if (err)
85		fprintf(stderr, "get tunnel \"%s\" failed: %s\n", basedev,
86			strerror(errno));
87
88	close(fd);
89	return err;
90}
91
92int tnl_add_ioctl(int cmd, const char *basedev, const char *name, void *p)
93{
94	struct ifreq ifr;
95	int fd;
96	int err;
97
98	if (cmd == SIOCCHGTUNNEL && name[0])
99		strncpy(ifr.ifr_name, name, IFNAMSIZ);
100	else
101		strncpy(ifr.ifr_name, basedev, IFNAMSIZ);
102	ifr.ifr_ifru.ifru_data = p;
103
104	fd = socket(preferred_family, SOCK_DGRAM, 0);
105	if (fd < 0) {
106		fprintf(stderr, "create socket failed: %s\n", strerror(errno));
107		return -1;
108	}
109
110	err = ioctl(fd, cmd, &ifr);
111	if (err)
112		fprintf(stderr, "add tunnel \"%s\" failed: %s\n", ifr.ifr_name,
113			strerror(errno));
114	close(fd);
115	return err;
116}
117
118int tnl_del_ioctl(const char *basedev, const char *name, void *p)
119{
120	struct ifreq ifr;
121	int fd;
122	int err;
123
124	if (name[0])
125		strncpy(ifr.ifr_name, name, IFNAMSIZ);
126	else
127		strncpy(ifr.ifr_name, basedev, IFNAMSIZ);
128
129	ifr.ifr_ifru.ifru_data = p;
130
131	fd = socket(preferred_family, SOCK_DGRAM, 0);
132	if (fd < 0) {
133		fprintf(stderr, "create socket failed: %s\n", strerror(errno));
134		return -1;
135	}
136
137	err = ioctl(fd, SIOCDELTUNNEL, &ifr);
138	if (err)
139		fprintf(stderr, "delete tunnel \"%s\" failed: %s\n",
140			ifr.ifr_name, strerror(errno));
141	close(fd);
142	return err;
143}
144
145static int tnl_gen_ioctl(int cmd, const char *name,
146			 void *p, int skiperr)
147{
148	struct ifreq ifr;
149	int fd;
150	int err;
151
152	strncpy(ifr.ifr_name, name, IFNAMSIZ);
153	ifr.ifr_ifru.ifru_data = p;
154
155	fd = socket(preferred_family, SOCK_DGRAM, 0);
156	if (fd < 0) {
157		fprintf(stderr, "create socket failed: %s\n", strerror(errno));
158		return -1;
159	}
160
161	err = ioctl(fd, cmd, &ifr);
162	if (err && errno != skiperr)
163		fprintf(stderr, "%s: ioctl %x failed: %s\n", name,
164			cmd, strerror(errno));
165	close(fd);
166	return err;
167}
168
169int tnl_prl_ioctl(int cmd, const char *name, void *p)
170{
171	return tnl_gen_ioctl(cmd, name, p, -1);
172}
173
174int tnl_6rd_ioctl(int cmd, const char *name, void *p)
175{
176	return tnl_gen_ioctl(cmd, name, p, -1);
177}
178
179int tnl_ioctl_get_6rd(const char *name, void *p)
180{
181	return tnl_gen_ioctl(SIOCGET6RD, name, p, EINVAL);
182}
183
184__be32 tnl_parse_key(const char *name, const char *key)
185{
186	unsigned uval;
187
188	if (strchr(key, '.'))
189		return get_addr32(key);
190
191	if (get_unsigned(&uval, key, 0) < 0) {
192		fprintf(stderr, "invalid value for \"%s\": \"%s\";", name, key);
193		fprintf(stderr, " it should be an unsigned integer\n");
194		exit(-1);
195	}
196	return htonl(uval);
197}
198