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
tnl_strproto(__u8 proto)41 const 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
tnl_ioctl_get_ifindex(const char * dev)66 int 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
tnl_ioctl_get_iftype(const char * dev)83 int 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
tnl_ioctl_get_ifname(int idx)101 char * 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
tnl_get_ioctl(const char * basedev,void * p)118 int 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
tnl_add_ioctl(int cmd,const char * basedev,const char * name,void * p)134 int 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
tnl_del_ioctl(const char * basedev,const char * name,void * p)153 int 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
tnl_gen_ioctl(int cmd,const char * name,void * p,int skiperr)172 static int tnl_gen_ioctl(int cmd, const char *name, void *p, int skiperr)
173 {
174 struct ifreq ifr;
175 int fd;
176 int err;
177
178 strncpy(ifr.ifr_name, name, IFNAMSIZ);
179 ifr.ifr_ifru.ifru_data = p;
180 fd = socket(preferred_family, SOCK_DGRAM, 0);
181 err = ioctl(fd, cmd, &ifr);
182 if (err && errno != skiperr)
183 perror("ioctl");
184 close(fd);
185 return err;
186 }
187
tnl_prl_ioctl(int cmd,const char * name,void * p)188 int tnl_prl_ioctl(int cmd, const char *name, void *p)
189 {
190 return tnl_gen_ioctl(cmd, name, p, -1);
191 }
192
tnl_6rd_ioctl(int cmd,const char * name,void * p)193 int tnl_6rd_ioctl(int cmd, const char *name, void *p)
194 {
195 return tnl_gen_ioctl(cmd, name, p, -1);
196 }
197
tnl_ioctl_get_6rd(const char * name,void * p)198 int tnl_ioctl_get_6rd(const char *name, void *p)
199 {
200 return tnl_gen_ioctl(SIOCGET6RD, name, p, EINVAL);
201 }
202