-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathnf_nat64_config.c
233 lines (218 loc) · 7.04 KB
/
nf_nat64_config.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
/*
* NAT64 - Network Address Translator IPv6 to IPv4
*
* Copyright (C) 2010 Viagenie Inc. http://www.viagenie.ca
*
* Authors:
* Jean-Philippe Dionne <[email protected]>
* Simon Perreault <[email protected]>
* Marc Blanchet <[email protected]>
*
* NAT64 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 3 of the License, or
* (at your option) any later version.
*
* NAT64 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 NAT64. If not, see <http://www.gnu.org/licenses/>.
*/
#include "linux/bug.h"
#include "nf_nat64_config.h"
#include <linux/kernel.h> /* Needed for KERN_INFO */
struct nat64_config_t {
int prefix_len;
struct in6_addr prefix;
/* XXX Determine this address dynamicaly */
struct in_addr nat_addr;
};
static struct nat64_config_t nat64_config;
void nat64_config_set_prefix(struct in6_addr prefix, int prefix_len)
{
if (prefix_len == 96 && nat64_config.prefix.s6_addr[8] == 0)
printk(KERN_ERR "nf_nat64: Bits 64 to 71 must be set to 0. See draft-ietf-behave-address-format.\n");
nat64_config.prefix = prefix;
nat64_config.prefix_len = prefix_len;
}
void nat64_config_set_nat_addr(struct in_addr addr)
{
nat64_config.nat_addr = addr;
}
int nat64_config_prefix_len()
{
return nat64_config.prefix_len;
}
struct in6_addr * nat64_config_prefix()
{
return &(nat64_config.prefix);
}
struct in_addr * nat64_config_nat_addr()
{
return &(nat64_config.nat_addr);
}
struct in_addr
nat64_extract(const struct in6_addr *a6)
{
struct in_addr a4;
switch (nat64_config.prefix_len) {
case 32:
((uint8_t *)&a4)[0] = a6->s6_addr[4];
((uint8_t *)&a4)[1] = a6->s6_addr[5];
((uint8_t *)&a4)[2] = a6->s6_addr[6];
((uint8_t *)&a4)[3] = a6->s6_addr[7];
break;
case 40:
((uint8_t *)&a4)[0] = a6->s6_addr[5];
((uint8_t *)&a4)[1] = a6->s6_addr[6];
((uint8_t *)&a4)[2] = a6->s6_addr[7];
((uint8_t *)&a4)[3] = a6->s6_addr[9];
break;
case 48:
((uint8_t *)&a4)[0] = a6->s6_addr[6];
((uint8_t *)&a4)[1] = a6->s6_addr[7];
((uint8_t *)&a4)[2] = a6->s6_addr[9];
((uint8_t *)&a4)[3] = a6->s6_addr[10];
break;
case 56:
((uint8_t *)&a4)[0] = a6->s6_addr[7];
((uint8_t *)&a4)[1] = a6->s6_addr[9];
((uint8_t *)&a4)[2] = a6->s6_addr[10];
((uint8_t *)&a4)[3] = a6->s6_addr[11];
break;
case 64:
((uint8_t *)&a4)[0] = a6->s6_addr[9];
((uint8_t *)&a4)[1] = a6->s6_addr[10];
((uint8_t *)&a4)[2] = a6->s6_addr[11];
((uint8_t *)&a4)[3] = a6->s6_addr[12];
break;
case 96:
((uint8_t *)&a4)[0] = a6->s6_addr[12];
((uint8_t *)&a4)[1] = a6->s6_addr[13];
((uint8_t *)&a4)[2] = a6->s6_addr[14];
((uint8_t *)&a4)[3] = a6->s6_addr[15];
break;
// XXX kernel equivalent? */
default:
WARN_ON_ONCE(1);
}
return a4;
}
void
nat64_embed(struct in_addr a4, struct in6_addr *a6)
{
switch (nat64_config.prefix_len) {
case 32:
a6->s6_addr[ 0] = nat64_config.prefix.s6_addr[0];
a6->s6_addr[ 1] = nat64_config.prefix.s6_addr[1];
a6->s6_addr[ 2] = nat64_config.prefix.s6_addr[2];
a6->s6_addr[ 3] = nat64_config.prefix.s6_addr[3];
a6->s6_addr[ 4] = ((uint8_t *)&a4)[0];
a6->s6_addr[ 5] = ((uint8_t *)&a4)[1];
a6->s6_addr[ 6] = ((uint8_t *)&a4)[2];
a6->s6_addr[ 7] = ((uint8_t *)&a4)[3];
a6->s6_addr[ 8] = 0;
a6->s6_addr[ 9] = 0;
a6->s6_addr[10] = 0;
a6->s6_addr[11] = 0;
a6->s6_addr[12] = 0;
a6->s6_addr[13] = 0;
a6->s6_addr[14] = 0;
a6->s6_addr[15] = 0;
break;
case 40:
a6->s6_addr[ 0] = nat64_config.prefix.s6_addr[0];
a6->s6_addr[ 1] = nat64_config.prefix.s6_addr[1];
a6->s6_addr[ 2] = nat64_config.prefix.s6_addr[2];
a6->s6_addr[ 3] = nat64_config.prefix.s6_addr[3];
a6->s6_addr[ 4] = nat64_config.prefix.s6_addr[4];
a6->s6_addr[ 5] = ((uint8_t *)&a4)[0];
a6->s6_addr[ 6] = ((uint8_t *)&a4)[1];
a6->s6_addr[ 7] = ((uint8_t *)&a4)[2];
a6->s6_addr[ 8] = 0;
a6->s6_addr[ 9] = ((uint8_t *)&a4)[3];
a6->s6_addr[10] = 0;
a6->s6_addr[11] = 0;
a6->s6_addr[12] = 0;
a6->s6_addr[13] = 0;
a6->s6_addr[14] = 0;
a6->s6_addr[15] = 0;
break;
case 48:
a6->s6_addr[ 0] = nat64_config.prefix.s6_addr[0];
a6->s6_addr[ 1] = nat64_config.prefix.s6_addr[1];
a6->s6_addr[ 2] = nat64_config.prefix.s6_addr[2];
a6->s6_addr[ 3] = nat64_config.prefix.s6_addr[3];
a6->s6_addr[ 4] = nat64_config.prefix.s6_addr[4];
a6->s6_addr[ 5] = nat64_config.prefix.s6_addr[5];
a6->s6_addr[ 6] = ((uint8_t *)&a4)[0];
a6->s6_addr[ 7] = ((uint8_t *)&a4)[1];
a6->s6_addr[ 8] = 0;
a6->s6_addr[ 9] = ((uint8_t *)&a4)[2];
a6->s6_addr[10] = ((uint8_t *)&a4)[3];
a6->s6_addr[11] = 0;
a6->s6_addr[12] = 0;
a6->s6_addr[13] = 0;
a6->s6_addr[14] = 0;
a6->s6_addr[15] = 0;
break;
case 56:
a6->s6_addr[ 0] = nat64_config.prefix.s6_addr[0];
a6->s6_addr[ 1] = nat64_config.prefix.s6_addr[1];
a6->s6_addr[ 2] = nat64_config.prefix.s6_addr[2];
a6->s6_addr[ 3] = nat64_config.prefix.s6_addr[3];
a6->s6_addr[ 4] = nat64_config.prefix.s6_addr[4];
a6->s6_addr[ 5] = nat64_config.prefix.s6_addr[5];
a6->s6_addr[ 6] = nat64_config.prefix.s6_addr[6];
a6->s6_addr[ 7] = ((uint8_t *)&a4)[0];
a6->s6_addr[ 8] = 0;
a6->s6_addr[ 9] = ((uint8_t *)&a4)[1];
a6->s6_addr[10] = ((uint8_t *)&a4)[2];
a6->s6_addr[11] = ((uint8_t *)&a4)[3];
a6->s6_addr[12] = 0;
a6->s6_addr[13] = 0;
a6->s6_addr[14] = 0;
a6->s6_addr[15] = 0;
break;
case 64:
a6->s6_addr[ 0] = nat64_config.prefix.s6_addr[0];
a6->s6_addr[ 1] = nat64_config.prefix.s6_addr[1];
a6->s6_addr[ 2] = nat64_config.prefix.s6_addr[2];
a6->s6_addr[ 3] = nat64_config.prefix.s6_addr[3];
a6->s6_addr[ 4] = nat64_config.prefix.s6_addr[4];
a6->s6_addr[ 5] = nat64_config.prefix.s6_addr[5];
a6->s6_addr[ 6] = nat64_config.prefix.s6_addr[6];
a6->s6_addr[ 7] = nat64_config.prefix.s6_addr[7];
a6->s6_addr[ 8] = 0;
a6->s6_addr[ 9] = ((uint8_t *)&a4)[0];
a6->s6_addr[10] = ((uint8_t *)&a4)[1];
a6->s6_addr[11] = ((uint8_t *)&a4)[2];
a6->s6_addr[12] = ((uint8_t *)&a4)[3];
a6->s6_addr[13] = 0;
a6->s6_addr[14] = 0;
a6->s6_addr[15] = 0;
break;
case 96:
a6->s6_addr[ 0] = nat64_config.prefix.s6_addr[0];
a6->s6_addr[ 1] = nat64_config.prefix.s6_addr[1];
a6->s6_addr[ 2] = nat64_config.prefix.s6_addr[2];
a6->s6_addr[ 3] = nat64_config.prefix.s6_addr[3];
a6->s6_addr[ 4] = nat64_config.prefix.s6_addr[4];
a6->s6_addr[ 5] = nat64_config.prefix.s6_addr[5];
a6->s6_addr[ 6] = nat64_config.prefix.s6_addr[6];
a6->s6_addr[ 7] = nat64_config.prefix.s6_addr[7];
a6->s6_addr[ 8] = 0;
a6->s6_addr[ 9] = nat64_config.prefix.s6_addr[9];
a6->s6_addr[10] = nat64_config.prefix.s6_addr[10];
a6->s6_addr[11] = nat64_config.prefix.s6_addr[11];
a6->s6_addr[12] = ((uint8_t *)&a4)[0];
a6->s6_addr[13] = ((uint8_t *)&a4)[1];
a6->s6_addr[14] = ((uint8_t *)&a4)[2];
a6->s6_addr[15] = ((uint8_t *)&a4)[3];
break;
default:
WARN_ON_ONCE(1);
}
}