1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and

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13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * $FreeBSD: head/contrib/tcpdump/print-ip6.c 127675 2004-03-31 14:57:24Z bms $
22 */
23
24#ifndef lint
25static const char rcsid[] _U_ =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.32.2.8 2003/11/24 20:31:22 guy Exp $";
27#endif
28
29#ifdef HAVE_CONFIG_H
30#include "config.h"
31#endif
32
33#ifdef INET6
34
35#include <tcpdump-stdinc.h>
36
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40
41#include "interface.h"
42#include "addrtoname.h"
43#include "extract.h"
44
45#include "ip6.h"
46#include "ipproto.h"
47
48/*
49 * print an IP6 datagram.
50 */
51void
52ip6_print(register const u_char *bp, register u_int length)
53{
54 register const struct ip6_hdr *ip6;
55 register int advance;
56 u_int len;
57 const u_char *ipend;
58 register const u_char *cp;
59 register u_int payload_len;
60 int nh;
61 int fragmented = 0;
62 u_int flow;
63
64 ip6 = (const struct ip6_hdr *)bp;
65
66 TCHECK(*ip6);
67 if (length < sizeof (struct ip6_hdr)) {
68 (void)printf("truncated-ip6 %d", length);
69 return;
70 }
71
72 payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
73 len = payload_len + sizeof(struct ip6_hdr);
74 if (length < len)
75 (void)printf("truncated-ip6 - %d bytes missing!",
76 len - length);
77
78 /*
79 * Cut off the snapshot length to the end of the IP payload.
80 */
81 ipend = bp + len;
82 if (ipend < snapend)
83 snapend = ipend;
84
85 cp = (const u_char *)ip6;
86 advance = sizeof(struct ip6_hdr);
87 nh = ip6->ip6_nxt;
88 while (cp < snapend && advance > 0) {
89 cp += advance;
90 len -= advance;
91
92 if (cp == (const u_char *)(ip6 + 1) &&
93 nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
94 nh != IPPROTO_SCTP) {
95 (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
96 ip6addr_string(&ip6->ip6_dst));
97 }
98
99 switch (nh) {
100 case IPPROTO_HOPOPTS:
101 advance = hbhopt_print(cp);
102 nh = *cp;

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107 break;
108 case IPPROTO_FRAGMENT:
109 advance = frag6_print(cp, (const u_char *)ip6);
110 if (snapend <= cp + advance)
111 goto end;
112 nh = *cp;
113 fragmented = 1;
114 break;
115
116 case IPPROTO_MOBILITY_OLD:
117 case IPPROTO_MOBILITY:
118 /*
119 * XXX - we don't use "advance"; the current
120 * "Mobility Support in IPv6" draft
121 * (draft-ietf-mobileip-ipv6-24) says that
122 * the next header field in a mobility header
123 * should be IPPROTO_NONE, but speaks of
124 * the possiblity of a future extension in
125 * which payload can be piggybacked atop a
126 * mobility header.
127 */
128 advance = mobility_print(cp, (const u_char *)ip6);
129 nh = *cp;
130 goto end;
131 case IPPROTO_ROUTING:
132 advance = rt6_print(cp, (const u_char *)ip6);
133 nh = *cp;
134 break;
135 case IPPROTO_SCTP:
136 sctp_print(cp, (const u_char *)ip6, len);
137 goto end;
138 case IPPROTO_TCP:
139 tcp_print(cp, len, (const u_char *)ip6, fragmented);
140 goto end;
141 case IPPROTO_UDP:
142 udp_print(cp, len, (const u_char *)ip6, fragmented);
143 goto end;
144 case IPPROTO_ICMPV6:
145 icmp6_print(cp, len, (const u_char *)ip6, fragmented);
146 goto end;
147 case IPPROTO_AH:
148 advance = ah_print(cp);
149 nh = *cp;
150 break;
151 case IPPROTO_ESP:
152 {
153 int enh, padlen;
154 advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
155 nh = enh & 0xff;
156 len -= padlen;
157 break;
158 }
159 case IPPROTO_IPCOMP:
160 {
161 int enh;
162 advance = ipcomp_print(cp, &enh);
163 nh = enh & 0xff;
164 break;
165 }
166
167 case IPPROTO_PIM:
168 pim_print(cp, len);
169 goto end;
170 case IPPROTO_OSPF:
171 ospf6_print(cp, len);
172 goto end;
173
174 case IPPROTO_IPV6:
175 ip6_print(cp, len);
176 goto end;
177
178 case IPPROTO_IPV4:
179 ip_print(cp, len);
180 goto end;
181
182 case IPPROTO_NONE:
183 (void)printf("no next header");
184 goto end;
185
186 default:
187 (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
188 goto end;
189 }
190 }
191
192 end:
193
194 flow = EXTRACT_32BITS(&ip6->ip6_flow);
195#if 0
196 /* rfc1883 */
197 if (flow & 0x0f000000)
198 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
199 if (flow & 0x00ffffff)
200 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
201#else
202 /* RFC 2460 */
203 if (flow & 0x0ff00000)
204 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
205 if (flow & 0x000fffff)
206 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
207#endif
208
209 if (ip6->ip6_hlim <= 1)
210 (void)printf(" [hlim %u]", ip6->ip6_hlim);
211
212 if (vflag) {
213 printf(" (");
214 (void)printf("len %u", payload_len);
215 if (ip6->ip6_hlim > 1)
216 (void)printf(", hlim %d", (int)ip6->ip6_hlim);
217 printf(")");
218 }
219 return;
220trunc:
221 (void)printf("[|ip6]");
222}
223
224#endif /* INET6 */