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
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
|
/* $KAME: rthdr.c,v 1.8 2001/08/20 02:32:40 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <string.h>
#include <stdio.h>
size_t
inet6_rthdr_space(type, seg)
int type, seg;
{
switch(type) {
case IPV6_RTHDR_TYPE_0:
if (seg < 1 || seg > 23)
return(0);
return(CMSG_SPACE(sizeof(struct in6_addr) * (seg - 1)
+ sizeof(struct ip6_rthdr0)));
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_space: unknown type(%d)\n", type);
#endif
return(0);
}
}
struct cmsghdr *
inet6_rthdr_init(bp, type)
void *bp;
int type;
{
struct cmsghdr *ch = (struct cmsghdr *)bp;
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(ch);
ch->cmsg_level = IPPROTO_IPV6;
ch->cmsg_type = IPV6_RTHDR;
switch(type) {
case IPV6_RTHDR_TYPE_0:
ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0) - sizeof(struct in6_addr));
bzero(rthdr, sizeof(struct ip6_rthdr0));
rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
return(ch);
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_init: unknown type(%d)\n", type);
#endif
return(NULL);
}
}
int
inet6_rthdr_add(cmsg, addr, flags)
struct cmsghdr *cmsg;
const struct in6_addr *addr;
u_int flags;
{
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
switch(rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_add: unsupported flag(%d)\n", flags);
#endif
return(-1);
}
if (rt0->ip6r0_segleft == 23) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
#endif
return(-1);
}
if (flags == IPV6_RTHDR_STRICT) {
int c, b;
c = rt0->ip6r0_segleft / 8;
b = rt0->ip6r0_segleft % 8;
rt0->ip6r0_slmap[c] |= (1 << (7 - b));
}
rt0->ip6r0_segleft++;
bcopy(addr, (caddr_t)rt0 + ((rt0->ip6r0_len + 1) << 3),
sizeof(struct in6_addr));
rt0->ip6r0_len += sizeof(struct in6_addr) >> 3;
cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3);
break;
}
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_add: unknown type(%d)\n",
rthdr->ip6r_type);
#endif
return(-1);
}
return(0);
}
int
inet6_rthdr_lasthop(cmsg, flags)
struct cmsghdr *cmsg;
unsigned int flags;
{
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
switch(rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_lasthop: unsupported flag(%d)\n", flags);
#endif
return(-1);
}
if (rt0->ip6r0_segleft > 23) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_add: segment overflow\n");
#endif
return(-1);
}
if (flags == IPV6_RTHDR_STRICT) {
int c, b;
c = rt0->ip6r0_segleft / 8;
b = rt0->ip6r0_segleft % 8;
rt0->ip6r0_slmap[c] |= (1 << (7 - b));
}
break;
}
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_lasthop: unknown type(%d)\n",
rthdr->ip6r_type);
#endif
return(-1);
}
return(0);
}
#if 0
int
inet6_rthdr_reverse(in, out)
const struct cmsghdr *in;
struct cmsghdr *out;
{
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_reverse: not implemented yet\n");
#endif
return -1;
}
#endif
int
inet6_rthdr_segments(cmsg)
const struct cmsghdr *cmsg;
{
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
switch(rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_segments: invalid size(%d)\n",
rt0->ip6r0_len);
#endif
return -1;
}
return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
}
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_segments: unknown type(%d)\n",
rthdr->ip6r_type);
#endif
return -1;
}
}
struct in6_addr *
inet6_rthdr_getaddr(cmsg, idx)
struct cmsghdr *cmsg;
int idx;
{
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
switch(rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
int naddr;
if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getaddr: invalid size(%d)\n",
rt0->ip6r0_len);
#endif
return NULL;
}
naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
if (idx <= 0 || naddr < idx) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getaddr: invalid idx(%d)\n", idx);
#endif
return NULL;
}
return &rt0->ip6r0_addr[idx - 1];
}
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getaddr: unknown type(%d)\n",
rthdr->ip6r_type);
#endif
return NULL;
}
}
int
inet6_rthdr_getflags(cmsg, idx)
const struct cmsghdr *cmsg;
int idx;
{
struct ip6_rthdr *rthdr;
rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
switch(rthdr->ip6r_type) {
case IPV6_RTHDR_TYPE_0:
{
struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
int naddr;
if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getflags: invalid size(%d)\n",
rt0->ip6r0_len);
#endif
return -1;
}
naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
if (idx < 0 || naddr < idx) {
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getflags: invalid idx(%d)\n", idx);
#endif
return -1;
}
if (rt0->ip6r0_slmap[idx / 8] & (0x80 >> (idx % 8)))
return IPV6_RTHDR_STRICT;
else
return IPV6_RTHDR_LOOSE;
}
default:
#ifdef DEBUG
fprintf(stderr, "inet6_rthdr_getflags: unknown type(%d)\n",
rthdr->ip6r_type);
#endif
return -1;
}
}
|
