print-ip6opts.c revision 75115 
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[] =
36     "@(#) $Header: /tcpdump/master/tcpdump/print-ip6opts.c,v 1.8 2000/12/13 07:57:05 itojun Exp $";
37#endif
38
39#ifdef INET6
40#include <sys/param.h>
41#include <sys/time.h>
42#include <sys/types.h>
43#include <sys/socket.h>
44
45#include <netinet/in.h>
46#include <stdio.h>
47
48#include "ip6.h"
49
50#include "interface.h"
51#include "addrtoname.h"
52
53/* items outside of rfc2292bis */
54#ifndef IP6OPT_MINLEN
55#define IP6OPT_MINLEN	2
56#endif
57#ifndef IP6OPT_RTALERT_LEN
58#define IP6OPT_RTALERT_LEN	4
59#endif
60#ifndef IP6OPT_JUMBO_LEN
61#define IP6OPT_JUMBO_LEN	6
62#endif
63#define IP6OPT_HOMEADDR_MINLEN 18
64#define IP6OPT_BU_MINLEN       10
65#define IP6OPT_BA_MINLEN       13
66#define IP6OPT_BR_MINLEN        2
67#define IP6SOPT_ALTCOA        0x4
68#define IP6SOPT_ALTCOA_MINLEN  18
69#define IP6SOPT_UI            0x2
70#define IP6SOPT_UI_MINLEN       4
71
72static void ip6_sopt_print(const u_char *, int);
73
74static void
75ip6_sopt_print(const u_char *bp, int len)
76{
77    int i;
78    int optlen;
79
80    for (i = 0; i < len; i += optlen) {
81	switch (bp[i]) {
82	case IP6OPT_PAD1:
83            printf(", pad1");
84	    optlen = 1;
85	    break;
86	case IP6OPT_PADN:
87	    if (len - i < IP6OPT_MINLEN) {
88		printf(", padn: trunc");
89		goto trunc;
90	    }
91            printf(", padn");
92	    optlen = bp[i + 1] + 2;
93	    break;
94        case IP6SOPT_ALTCOA:
95             if (len - i < IP6SOPT_ALTCOA_MINLEN) {
96		printf(", altcoa: trunc");
97		goto trunc;
98	    }
99            printf(", alt-CoA: %s", ip6addr_string(&bp[i+2]));
100	    optlen = bp[i + 1] + 2;
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) ", ntohs(*(u_int16_t *)&bp[i + 2]));
108	    optlen = bp[i + 1] + 2;
109	    break;
110	default:
111	    if (len - i < IP6OPT_MINLEN) {
112		printf(", sopt_type %d: trunc)", bp[i]);
113		goto trunc;
114	    }
115	    printf(", sopt_type 0x%02x: len=%d", bp[i], bp[i + 1]);
116	    optlen = bp[i + 1] + 2;
117	    break;
118	}
119    }
120    return;
121
122trunc:
123    printf("[trunc] ");
124}
125
126void
127ip6_opt_print(const u_char *bp, int len)
128{
129    int i;
130    int optlen;
131
132    for (i = 0; i < len; i += optlen) {
133	switch (bp[i]) {
134	case IP6OPT_PAD1:
135            printf("(pad1)");
136	    optlen = 1;
137	    break;
138	case IP6OPT_PADN:
139	    if (len - i < IP6OPT_MINLEN) {
140		printf("(padn: trunc)");
141		goto trunc;
142	    }
143            printf("(padn)");
144	    optlen = bp[i + 1] + 2;
145	    break;
146	case IP6OPT_ROUTER_ALERT:
147	    if (len - i < IP6OPT_RTALERT_LEN) {
148		printf("(rtalert: trunc)");
149		goto trunc;
150	    }
151	    if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
152		printf("(rtalert: invalid len %d)", bp[i + 1]);
153		goto trunc;
154	    }
155	    printf("(rtalert: 0x%04x) ", ntohs(*(u_int16_t *)&bp[i + 2]));
156	    optlen = IP6OPT_RTALERT_LEN;
157	    break;
158	case IP6OPT_JUMBO:
159	    if (len - i < IP6OPT_JUMBO_LEN) {
160		printf("(jumbo: trunc)");
161		goto trunc;
162	    }
163	    if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
164		printf("(jumbo: invalid len %d)", bp[i + 1]);
165		goto trunc;
166	    }
167	    printf("(jumbo: %u) ", (u_int32_t)ntohl(*(u_int32_t *)&bp[i + 2]));
168	    optlen = IP6OPT_JUMBO_LEN;
169	    break;
170        case IP6OPT_HOME_ADDRESS:
171	    if (len - i < IP6OPT_HOMEADDR_MINLEN) {
172		printf("(homeaddr: trunc)");
173		goto trunc;
174	    }
175	    if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) {
176		printf("(homeaddr: invalid len %d)", bp[i + 1]);
177		goto trunc;
178	    }
179	    printf("(homeaddr: %s", ip6addr_string(&bp[i + 2]));
180            if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) {
181		ip6_sopt_print(&bp[i + IP6OPT_HOMEADDR_MINLEN],
182		    (optlen-IP6OPT_HOMEADDR_MINLEN));
183	    }
184            printf(")");
185	    optlen = bp[i + 1] + 2;
186	    break;
187        case IP6OPT_BINDING_UPDATE:
188	    if (len - i < IP6OPT_BU_MINLEN) {
189		printf("(bu: trunc)");
190		goto trunc;
191	    }
192	    if (bp[i + 1] < IP6OPT_BU_MINLEN - 2) {
193		printf("(bu: invalid len %d)", bp[i + 1]);
194		goto trunc;
195	    }
196	    printf("(bu: ");
197	    if (bp[i + 2] & 0x80)
198		    printf("A");
199	    if (bp[i + 2] & 0x40)
200		    printf("H");
201	    if (bp[i + 2] & 0x20)
202		    printf("R");
203	    if (bp[i + 2] & 0x10)
204		    printf("D");
205	    if (bp[i + 2] & 0x0f)
206		    printf("res");
207	    printf(", prefixlen: %u", bp[i + 3]);
208	    printf(", sequence: %u",
209		(u_int16_t)ntohs(*(u_int16_t *)&bp[i + 4]));
210	    printf(", lifetime: %u",
211		(u_int32_t)ntohs(*(u_int32_t *)&bp[i + 8]));
212
213	    optlen = bp[i + 1] + 2;
214	    if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) {
215		ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN],
216		    (optlen - IP6OPT_BU_MINLEN));
217	    }
218	    printf(")");
219	    break;
220	case IP6OPT_BINDING_ACK:
221	    if (len - i < IP6OPT_BA_MINLEN) {
222		printf("(ba: trunc)");
223		goto trunc;
224	    }
225	    if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) {
226		printf("(ba: invalid len %d)", bp[i + 1]);
227		goto trunc;
228	    }
229	    printf("(ba: ");
230	    printf("status: %u", bp[i + 2]);
231	    printf(", sequence: %u",
232		(u_int16_t)ntohs(*(u_int16_t *)&bp[i + 3]));
233	    printf(", lifetime: %u",
234		(u_int32_t)ntohs(*(u_int32_t *)&bp[i + 7]));
235	    printf(", refresh: %u",
236		(u_int32_t)ntohs(*(u_int32_t *)&bp[i + 11]));
237
238	    if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) {
239		ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN],
240		    (optlen-IP6OPT_BA_MINLEN));
241	    }
242            printf(")");
243	    optlen = bp[i + 1] + 2;
244	    break;
245        case IP6OPT_BINDING_REQ:
246	    if (len - i < IP6OPT_BR_MINLEN) {
247		printf("(br: trunc)");
248		goto trunc;
249	    }
250            printf("(br");
251            if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) {
252		ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN],
253		    (optlen-IP6OPT_BR_MINLEN));
254	    }
255            printf(")");
256	    optlen = bp[i + 1] + 2;
257	    break;
258	default:
259	    if (len - i < IP6OPT_MINLEN) {
260		printf("(type %d: trunc)", bp[i]);
261		goto trunc;
262	    }
263	    printf("(opt_type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
264	    optlen = bp[i + 1] + 2;
265	    break;
266	}
267    }
268
269#if 0
270end:
271#endif
272    return;
273
274trunc:
275    printf("[trunc] ");
276}
277
278int
279hbhopt_print(register const u_char *bp)
280{
281    const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
282    register const u_char *ep;
283    int hbhlen = 0;
284
285    /* 'ep' points to the end of available data. */
286    ep = snapend;
287    TCHECK(dp->ip6h_len);
288    hbhlen = (int)((dp->ip6h_len + 1) << 3);
289    TCHECK2(*dp, hbhlen);
290    printf("HBH ");
291    if (vflag)
292	ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
293
294    return(hbhlen);
295
296  trunc:
297    fputs("[|HBH]", stdout);
298    return(hbhlen);
299}
300
301int
302dstopt_print(register const u_char *bp)
303{
304    const struct ip6_dest *dp = (struct ip6_dest *)bp;
305    register const u_char *ep;
306    int dstoptlen = 0;
307
308    /* 'ep' points to the end of available data. */
309    ep = snapend;
310    TCHECK(dp->ip6d_len);
311    dstoptlen = (int)((dp->ip6d_len + 1) << 3);
312    TCHECK2(*dp, dstoptlen);
313    printf("DSTOPT ");
314    if (vflag) {
315	ip6_opt_print((const u_char *)dp + sizeof(*dp),
316	    dstoptlen - sizeof(*dp));
317    }
318
319    return(dstoptlen);
320
321  trunc:
322    fputs("[|DSTOPT]", stdout);
323    return(dstoptlen);
324}
325#endif /* INET6 */
326