1 /*
2 * Copyright (C) 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #ifndef lint
35 static const char rcsid[] _U_ =
36 "@(#) $Header: /tcpdump/master/tcpdump/print-ip6opts.c,v 1.18 2005-04-20 22:18:50 guy Exp $";
37 #endif
38
39 #ifdef INET6
40 #include <tcpdump-stdinc.h>
41
42 #include <stdio.h>
43
44 #include "ip6.h"
45
46 #include "interface.h"
47 #include "addrtoname.h"
48 #include "extract.h"
49
50 /* items outside of rfc2292bis */
51 #ifndef IP6OPT_MINLEN
52 #define IP6OPT_MINLEN 2
53 #endif
54 #ifndef IP6OPT_RTALERT_LEN
55 #define IP6OPT_RTALERT_LEN 4
56 #endif
57 #ifndef IP6OPT_JUMBO_LEN
58 #define IP6OPT_JUMBO_LEN 6
59 #endif
60 #define IP6OPT_HOMEADDR_MINLEN 18
61 #define IP6OPT_BU_MINLEN 10
62 #define IP6OPT_BA_MINLEN 13
63 #define IP6OPT_BR_MINLEN 2
64 #define IP6SOPT_UI 0x2
65 #define IP6SOPT_UI_MINLEN 4
66 #define IP6SOPT_ALTCOA 0x3
67 #define IP6SOPT_ALTCOA_MINLEN 18
68 #define IP6SOPT_AUTH 0x4
69 #define IP6SOPT_AUTH_MINLEN 6
70
71 static void ip6_sopt_print(const u_char *, int);
72
73 static void
ip6_sopt_print(const u_char * bp,int len)74 ip6_sopt_print(const u_char *bp, int len)
75 {
76 int i;
77 int optlen;
78
79 for (i = 0; i < len; i += optlen) {
80 if (bp[i] == IP6OPT_PAD1)
81 optlen = 1;
82 else {
83 if (i + 1 < len)
84 optlen = bp[i + 1] + 2;
85 else
86 goto trunc;
87 }
88 if (i + optlen > len)
89 goto trunc;
90
91 switch (bp[i]) {
92 case IP6OPT_PAD1:
93 printf(", pad1");
94 break;
95 case IP6OPT_PADN:
96 if (len - i < IP6OPT_MINLEN) {
97 printf(", padn: trunc");
98 goto trunc;
99 }
100 printf(", padn");
101 break;
102 case IP6SOPT_UI:
103 if (len - i < IP6SOPT_UI_MINLEN) {
104 printf(", ui: trunc");
105 goto trunc;
106 }
107 printf(", ui: 0x%04x ", EXTRACT_16BITS(&bp[i + 2]));
108 break;
109 case IP6SOPT_ALTCOA:
110 if (len - i < IP6SOPT_ALTCOA_MINLEN) {
111 printf(", altcoa: trunc");
112 goto trunc;
113 }
114 printf(", alt-CoA: %s", ip6addr_string(&bp[i+2]));
115 break;
116 case IP6SOPT_AUTH:
117 if (len - i < IP6SOPT_AUTH_MINLEN) {
118 printf(", auth: trunc");
119 goto trunc;
120 }
121 printf(", auth spi: 0x%08x", EXTRACT_32BITS(&bp[i + 2]));
122 break;
123 default:
124 if (len - i < IP6OPT_MINLEN) {
125 printf(", sopt_type %d: trunc)", bp[i]);
126 goto trunc;
127 }
128 printf(", sopt_type 0x%02x: len=%d", bp[i], bp[i + 1]);
129 break;
130 }
131 }
132 return;
133
134 trunc:
135 printf("[trunc] ");
136 }
137
138 void
ip6_opt_print(const u_char * bp,int len)139 ip6_opt_print(const u_char *bp, int len)
140 {
141 int i;
142 int optlen = 0;
143
144 if (len == 0)
145 return;
146 for (i = 0; i < len; i += optlen) {
147 if (bp[i] == IP6OPT_PAD1)
148 optlen = 1;
149 else {
150 if (i + 1 < len)
151 optlen = bp[i + 1] + 2;
152 else
153 goto trunc;
154 }
155 if (i + optlen > len)
156 goto trunc;
157
158 switch (bp[i]) {
159 case IP6OPT_PAD1:
160 printf("(pad1)");
161 break;
162 case IP6OPT_PADN:
163 if (len - i < IP6OPT_MINLEN) {
164 printf("(padn: trunc)");
165 goto trunc;
166 }
167 printf("(padn)");
168 break;
169 case IP6OPT_ROUTER_ALERT:
170 if (len - i < IP6OPT_RTALERT_LEN) {
171 printf("(rtalert: trunc)");
172 goto trunc;
173 }
174 if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
175 printf("(rtalert: invalid len %d)", bp[i + 1]);
176 goto trunc;
177 }
178 printf("(rtalert: 0x%04x) ", EXTRACT_16BITS(&bp[i + 2]));
179 break;
180 case IP6OPT_JUMBO:
181 if (len - i < IP6OPT_JUMBO_LEN) {
182 printf("(jumbo: trunc)");
183 goto trunc;
184 }
185 if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
186 printf("(jumbo: invalid len %d)", bp[i + 1]);
187 goto trunc;
188 }
189 printf("(jumbo: %u) ", EXTRACT_32BITS(&bp[i + 2]));
190 break;
191 case IP6OPT_HOME_ADDRESS:
192 if (len - i < IP6OPT_HOMEADDR_MINLEN) {
193 printf("(homeaddr: trunc)");
194 goto trunc;
195 }
196 if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) {
197 printf("(homeaddr: invalid len %d)", bp[i + 1]);
198 goto trunc;
199 }
200 printf("(homeaddr: %s", ip6addr_string(&bp[i + 2]));
201 if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) {
202 ip6_sopt_print(&bp[i + IP6OPT_HOMEADDR_MINLEN],
203 (optlen - IP6OPT_HOMEADDR_MINLEN));
204 }
205 printf(")");
206 break;
207 case IP6OPT_BINDING_UPDATE:
208 if (len - i < IP6OPT_BU_MINLEN) {
209 printf("(bu: trunc)");
210 goto trunc;
211 }
212 if (bp[i + 1] < IP6OPT_BU_MINLEN - 2) {
213 printf("(bu: invalid len %d)", bp[i + 1]);
214 goto trunc;
215 }
216 printf("(bu: ");
217 if (bp[i + 2] & 0x80)
218 printf("A");
219 if (bp[i + 2] & 0x40)
220 printf("H");
221 if (bp[i + 2] & 0x20)
222 printf("S");
223 if (bp[i + 2] & 0x10)
224 printf("D");
225 if ((bp[i + 2] & 0x0f) || bp[i + 3] || bp[i + 4])
226 printf("res");
227 printf(", sequence: %u", bp[i + 5]);
228 printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 6]));
229
230 if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) {
231 ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN],
232 (optlen - IP6OPT_BU_MINLEN));
233 }
234 printf(")");
235 break;
236 case IP6OPT_BINDING_ACK:
237 if (len - i < IP6OPT_BA_MINLEN) {
238 printf("(ba: trunc)");
239 goto trunc;
240 }
241 if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) {
242 printf("(ba: invalid len %d)", bp[i + 1]);
243 goto trunc;
244 }
245 printf("(ba: ");
246 printf("status: %u", bp[i + 2]);
247 if (bp[i + 3])
248 printf("res");
249 printf(", sequence: %u", bp[i + 4]);
250 printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 5]));
251 printf(", refresh: %u", EXTRACT_32BITS(&bp[i + 9]));
252
253 if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) {
254 ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN],
255 (optlen - IP6OPT_BA_MINLEN));
256 }
257 printf(")");
258 break;
259 case IP6OPT_BINDING_REQ:
260 if (len - i < IP6OPT_BR_MINLEN) {
261 printf("(br: trunc)");
262 goto trunc;
263 }
264 printf("(br");
265 if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) {
266 ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN],
267 (optlen - IP6OPT_BR_MINLEN));
268 }
269 printf(")");
270 break;
271 default:
272 if (len - i < IP6OPT_MINLEN) {
273 printf("(type %d: trunc)", bp[i]);
274 goto trunc;
275 }
276 printf("(opt_type 0x%02x: len=%d)", bp[i], bp[i + 1]);
277 break;
278 }
279 }
280 printf(" ");
281
282 #if 0
283 end:
284 #endif
285 return;
286
287 trunc:
288 printf("[trunc] ");
289 }
290
291 int
hbhopt_print(register const u_char * bp)292 hbhopt_print(register const u_char *bp)
293 {
294 const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
295 int hbhlen = 0;
296
297 TCHECK(dp->ip6h_len);
298 hbhlen = (int)((dp->ip6h_len + 1) << 3);
299 TCHECK2(*dp, hbhlen);
300 printf("HBH ");
301 if (vflag)
302 ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
303
304 return(hbhlen);
305
306 trunc:
307 fputs("[|HBH]", stdout);
308 return(-1);
309 }
310
311 int
dstopt_print(register const u_char * bp)312 dstopt_print(register const u_char *bp)
313 {
314 const struct ip6_dest *dp = (struct ip6_dest *)bp;
315 int dstoptlen = 0;
316
317 TCHECK(dp->ip6d_len);
318 dstoptlen = (int)((dp->ip6d_len + 1) << 3);
319 TCHECK2(*dp, dstoptlen);
320 printf("DSTOPT ");
321 if (vflag) {
322 ip6_opt_print((const u_char *)dp + sizeof(*dp),
323 dstoptlen - sizeof(*dp));
324 }
325
326 return(dstoptlen);
327
328 trunc:
329 fputs("[|DSTOPT]", stdout);
330 return(-1);
331 }
332 #endif /* INET6 */
333