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    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
283end:
284#endif
285    return;
286
287trunc:
288    printf("[trunc] ");
289}
290
291int
292hbhopt_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
311int
312dstopt_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