print-ip6opts.c revision 225736 
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
35static 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
71static void ip6_sopt_print(const u_char *, int);
72
73static void
74ip6_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
134trunc:
135    printf("[trunc] ");
136}
137
138void
139ip6_opt_print(const u_char *bp, int len)
140{
141    int i;
142    int optlen = 0;
143
144    for (i = 0; i < len; i += optlen) {
145	if (bp[i] == IP6OPT_PAD1)
146	    optlen = 1;
147	else {
148	    if (i + 1 < len)
149		optlen = bp[i + 1] + 2;
150	    else
151		goto trunc;
152	}
153	if (i + optlen > len)
154	    goto trunc;
155
156	switch (bp[i]) {
157	case IP6OPT_PAD1:
158            printf("(pad1)");
159	    break;
160	case IP6OPT_PADN:
161	    if (len - i < IP6OPT_MINLEN) {
162		printf("(padn: trunc)");
163		goto trunc;
164	    }
165            printf("(padn)");
166	    break;
167	case IP6OPT_ROUTER_ALERT:
168	    if (len - i < IP6OPT_RTALERT_LEN) {
169		printf("(rtalert: trunc)");
170		goto trunc;
171	    }
172	    if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
173		printf("(rtalert: invalid len %d)", bp[i + 1]);
174		goto trunc;
175	    }
176	    printf("(rtalert: 0x%04x) ", EXTRACT_16BITS(&bp[i + 2]));
177	    break;
178	case IP6OPT_JUMBO:
179	    if (len - i < IP6OPT_JUMBO_LEN) {
180		printf("(jumbo: trunc)");
181		goto trunc;
182	    }
183	    if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
184		printf("(jumbo: invalid len %d)", bp[i + 1]);
185		goto trunc;
186	    }
187	    printf("(jumbo: %u) ", EXTRACT_32BITS(&bp[i + 2]));
188	    break;
189        case IP6OPT_HOME_ADDRESS:
190	    if (len - i < IP6OPT_HOMEADDR_MINLEN) {
191		printf("(homeaddr: trunc)");
192		goto trunc;
193	    }
194	    if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) {
195		printf("(homeaddr: invalid len %d)", bp[i + 1]);
196		goto trunc;
197	    }
198	    printf("(homeaddr: %s", ip6addr_string(&bp[i + 2]));
199            if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) {
200		ip6_sopt_print(&bp[i + IP6OPT_HOMEADDR_MINLEN],
201		    (optlen - IP6OPT_HOMEADDR_MINLEN));
202	    }
203            printf(")");
204	    break;
205        case IP6OPT_BINDING_UPDATE:
206	    if (len - i < IP6OPT_BU_MINLEN) {
207		printf("(bu: trunc)");
208		goto trunc;
209	    }
210	    if (bp[i + 1] < IP6OPT_BU_MINLEN - 2) {
211		printf("(bu: invalid len %d)", bp[i + 1]);
212		goto trunc;
213	    }
214	    printf("(bu: ");
215	    if (bp[i + 2] & 0x80)
216		    printf("A");
217	    if (bp[i + 2] & 0x40)
218		    printf("H");
219	    if (bp[i + 2] & 0x20)
220		    printf("S");
221	    if (bp[i + 2] & 0x10)
222		    printf("D");
223	    if ((bp[i + 2] & 0x0f) || bp[i + 3] || bp[i + 4])
224		    printf("res");
225	    printf(", sequence: %u", bp[i + 5]);
226	    printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 6]));
227
228	    if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) {
229		ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN],
230		    (optlen - IP6OPT_BU_MINLEN));
231	    }
232	    printf(")");
233	    break;
234	case IP6OPT_BINDING_ACK:
235	    if (len - i < IP6OPT_BA_MINLEN) {
236		printf("(ba: trunc)");
237		goto trunc;
238	    }
239	    if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) {
240		printf("(ba: invalid len %d)", bp[i + 1]);
241		goto trunc;
242	    }
243	    printf("(ba: ");
244	    printf("status: %u", bp[i + 2]);
245	    if (bp[i + 3])
246		    printf("res");
247	    printf(", sequence: %u", bp[i + 4]);
248	    printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 5]));
249	    printf(", refresh: %u", EXTRACT_32BITS(&bp[i + 9]));
250
251	    if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) {
252		ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN],
253		    (optlen - IP6OPT_BA_MINLEN));
254	    }
255            printf(")");
256	    break;
257        case IP6OPT_BINDING_REQ:
258	    if (len - i < IP6OPT_BR_MINLEN) {
259		printf("(br: trunc)");
260		goto trunc;
261	    }
262            printf("(br");
263            if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) {
264		ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN],
265		    (optlen - IP6OPT_BR_MINLEN));
266	    }
267            printf(")");
268	    break;
269	default:
270	    if (len - i < IP6OPT_MINLEN) {
271		printf("(type %d: trunc)", bp[i]);
272		goto trunc;
273	    }
274	    printf("(opt_type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
275	    break;
276	}
277    }
278
279#if 0
280end:
281#endif
282    return;
283
284trunc:
285    printf("[trunc] ");
286}
287
288int
289hbhopt_print(register const u_char *bp)
290{
291    const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
292    int hbhlen = 0;
293
294    TCHECK(dp->ip6h_len);
295    hbhlen = (int)((dp->ip6h_len + 1) << 3);
296    TCHECK2(*dp, hbhlen);
297    printf("HBH ");
298    if (vflag)
299	ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
300
301    return(hbhlen);
302
303  trunc:
304    fputs("[|HBH]", stdout);
305    return(-1);
306}
307
308int
309dstopt_print(register const u_char *bp)
310{
311    const struct ip6_dest *dp = (struct ip6_dest *)bp;
312    int dstoptlen = 0;
313
314    TCHECK(dp->ip6d_len);
315    dstoptlen = (int)((dp->ip6d_len + 1) << 3);
316    TCHECK2(*dp, dstoptlen);
317    printf("DSTOPT ");
318    if (vflag) {
319	ip6_opt_print((const u_char *)dp + sizeof(*dp),
320	    dstoptlen - sizeof(*dp));
321    }
322
323    return(dstoptlen);
324
325  trunc:
326    fputs("[|DSTOPT]", stdout);
327    return(-1);
328}
329#endif /* INET6 */
330