print-ip6opts.c revision 56893 
1238104Sdes/*
2238104Sdes * Copyright (C) 1998 WIDE Project.
3238104Sdes * All rights reserved.
4238104Sdes *
5238104Sdes * Redistribution and use in source and binary forms, with or without
6238104Sdes * modification, are permitted provided that the following conditions
7238104Sdes * are met:
8238104Sdes * 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 1.2.2.1 2000/01/11 06:58:25 fenner 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 <netinet/ip6.h>
47
48#include <stdio.h>
49
50#include "interface.h"
51#include "addrtoname.h"
52
53void
54ip6_opt_print(const u_char *bp, int len)
55{
56    int i;
57    int optlen;
58
59    for (i = 0; i < len; i += optlen) {
60	switch (bp[i]) {
61	case IP6OPT_PAD1:
62	    optlen = 1;
63	    break;
64	case IP6OPT_PADN:
65	    if (len - i < IP6OPT_MINLEN) {
66		printf("(padn: trunc)");
67		goto trunc;
68	    }
69	    optlen = bp[i + 1] + 2;
70	    break;
71	case IP6OPT_RTALERT:
72	    if (len - i < IP6OPT_RTALERT_LEN) {
73		printf("(rtalert: trunc)");
74		goto trunc;
75	    }
76	    if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
77		printf("(rtalert: invalid len %d)", bp[i + 1]);
78		goto trunc;
79	    }
80	    printf("(rtalert: 0x%04x) ", ntohs(*(u_short *)&bp[i + 2]));
81	    optlen = IP6OPT_RTALERT_LEN;
82	    break;
83	case IP6OPT_JUMBO:
84	    if (len - i < IP6OPT_JUMBO_LEN) {
85		printf("(jumbo: trunc)");
86		goto trunc;
87	    }
88	    if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
89		printf("(jumbo: invalid len %d)", bp[i + 1]);
90		goto trunc;
91	    }
92	    printf("(jumbo: %u) ", (u_int32_t)ntohl(*(u_int *)&bp[i + 2]));
93	    optlen = IP6OPT_JUMBO_LEN;
94	    break;
95	default:
96	    if (len - i < IP6OPT_MINLEN) {
97		printf("(type %d: trunc)", bp[i]);
98		goto trunc;
99	    }
100	    printf("(type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
101	    optlen = bp[i + 1] + 2;
102	    break;
103	}
104    }
105
106#if 0
107end:
108#endif
109    return;
110
111trunc:
112    printf("[trunc] ");
113}
114
115int
116hbhopt_print(register const u_char *bp)
117{
118    const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
119    register const u_char *ep;
120    int hbhlen = 0;
121
122    /* 'ep' points to the end of avaible data. */
123    ep = snapend;
124    TCHECK(dp->ip6h_len);
125    hbhlen = (int)((dp->ip6h_len + 1) << 3);
126    TCHECK2(dp, hbhlen);
127    printf("HBH ");
128    if (vflag)
129	ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
130
131    return(hbhlen);
132
133  trunc:
134    fputs("[|HBH]", stdout);
135    return(hbhlen);
136}
137
138int
139dstopt_print(register const u_char *bp)
140{
141    const struct ip6_dest *dp = (struct ip6_dest *)bp;
142    register const u_char *ep;
143    int dstoptlen = 0;
144
145    /* 'ep' points to the end of avaible data. */
146    ep = snapend;
147    TCHECK(dp->ip6d_len);
148    dstoptlen = (int)((dp->ip6d_len + 1) << 3);
149    TCHECK2(dp, dstoptlen);
150    printf("DSTOPT ");
151    if (vflag) {
152	ip6_opt_print((const u_char *)dp + sizeof(*dp),
153	    dstoptlen - sizeof(*dp));
154    }
155
156    return(dstoptlen);
157
158  trunc:
159    fputs("[|DSTOPT]", stdout);
160    return(dstoptlen);
161}
162#endif /* INET6 */
163