tunnel.c revision 4d98ab00de90bac916f526c83c68012d7159f712 
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 0:
55		strcpy(buf, "any");
56		break;
57	default:
58		strcpy(buf, "unknown");
59		break;
60	}
61
62	return buf;
63}
64
65int tnl_get_ioctl(const char *basedev, void *p)
66{
67	struct ifreq ifr;
68	int fd;
69	int err;
70
71	strncpy(ifr.ifr_name, basedev, IFNAMSIZ);
72	ifr.ifr_ifru.ifru_data = (void*)p;
73	fd = socket(preferred_family, SOCK_DGRAM, 0);
74	err = ioctl(fd, SIOCGETTUNNEL, &ifr);
75	if (err)
76		fprintf(stderr, "get tunnel \"%s\" failed: %s\n", basedev,
77			strerror(errno));
78
79	close(fd);
80	return err;
81}
82
83int tnl_add_ioctl(int cmd, const char *basedev, const char *name, void *p)
84{
85	struct ifreq ifr;
86	int fd;
87	int err;
88
89	if (cmd == SIOCCHGTUNNEL && name[0])
90		strncpy(ifr.ifr_name, name, IFNAMSIZ);
91	else
92		strncpy(ifr.ifr_name, basedev, IFNAMSIZ);
93	ifr.ifr_ifru.ifru_data = p;
94	fd = socket(preferred_family, SOCK_DGRAM, 0);
95	err = ioctl(fd, cmd, &ifr);
96	if (err)
97		fprintf(stderr, "add tunnel \"%s\" failed: %s\n", ifr.ifr_name,
98			strerror(errno));
99	close(fd);
100	return err;
101}
102
103int tnl_del_ioctl(const char *basedev, const char *name, void *p)
104{
105	struct ifreq ifr;
106	int fd;
107	int err;
108
109	if (name[0])
110		strncpy(ifr.ifr_name, name, IFNAMSIZ);
111	else
112		strncpy(ifr.ifr_name, basedev, IFNAMSIZ);
113
114	ifr.ifr_ifru.ifru_data = p;
115	fd = socket(preferred_family, SOCK_DGRAM, 0);
116	err = ioctl(fd, SIOCDELTUNNEL, &ifr);
117	if (err)
118		fprintf(stderr, "delete tunnel \"%s\" failed: %s\n",
119			ifr.ifr_name, strerror(errno));
120	close(fd);
121	return err;
122}
123
124static int tnl_gen_ioctl(int cmd, const char *name,
125			 void *p, int skiperr)
126{
127	struct ifreq ifr;
128	int fd;
129	int err;
130
131	strncpy(ifr.ifr_name, name, IFNAMSIZ);
132	ifr.ifr_ifru.ifru_data = p;
133	fd = socket(preferred_family, SOCK_DGRAM, 0);
134	err = ioctl(fd, cmd, &ifr);
135	if (err && errno != skiperr)
136		fprintf(stderr, "%s: ioctl %x failed: %s\n", name,
137			cmd, strerror(errno));
138	close(fd);
139	return err;
140}
141
142int tnl_prl_ioctl(int cmd, const char *name, void *p)
143{
144	return tnl_gen_ioctl(cmd, name, p, -1);
145}
146
147int tnl_6rd_ioctl(int cmd, const char *name, void *p)
148{
149	return tnl_gen_ioctl(cmd, name, p, -1);
150}
151
152int tnl_ioctl_get_6rd(const char *name, void *p)
153{
154	return tnl_gen_ioctl(SIOCGET6RD, name, p, EINVAL);
155}
156