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 98527 2002-06-21 00:49:02Z fenner $
22 */
23
24#ifndef lint
25static const char rcsid[] =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.21 2001/11/16 02:17:36 itojun Exp $";
27#endif
28
29#ifdef HAVE_CONFIG_H
30#include "config.h"
31#endif
32
33#ifdef INET6
34
35#include <sys/param.h>
36#include <sys/time.h>
37#include <sys/types.h>
38#include <sys/socket.h>
39
40#include <netinet/in.h>
41
42#include <stdio.h>
43#include <stdlib.h>
44#include <unistd.h>
45#include <string.h>
46
47#include "interface.h"
48#include "addrtoname.h"
49
50#include "ip6.h"
51
52/*
53 * print an IP6 datagram.
54 */
55void
56ip6_print(register const u_char *bp, register u_int length)
57{
58 register const struct ip6_hdr *ip6;
59 register int advance;
60 register u_int len;
61 register const u_char *cp;
62 int nh;
63 int fragmented = 0;
64 u_int flow;
65
66 ip6 = (const struct ip6_hdr *)bp;
67
68#ifdef LBL_ALIGN
69 /*
70 * The IP6 header is not 16-byte aligned, so copy into abuf.
71 */
72 if ((u_long)ip6 & 15) {
73 static u_char *abuf;
74
75 if (abuf == NULL) {
76 abuf = malloc(snaplen);
77 if (abuf == NULL)
78 error("ip6_print: malloc");
79 }
80 memcpy(abuf, ip6, min(length, snaplen));
81 snapend += abuf - (u_char *)ip6;
82 packetp = abuf;
83 ip6 = (struct ip6_hdr *)abuf;
84 bp = abuf;
85 }
86#endif
87 TCHECK(*ip6);
88 if (length < sizeof (struct ip6_hdr)) {
89 (void)printf("truncated-ip6 %d", length);
90 return;
91 }
92 advance = sizeof(struct ip6_hdr);
93
94 len = ntohs(ip6->ip6_plen);
95 if (length < len + advance)
96 (void)printf("truncated-ip6 - %d bytes missing!",
97 len + advance - length);
98
99 cp = (const u_char *)ip6;
100 nh = ip6->ip6_nxt;
101 while (cp < snapend) {
102 cp += advance;
103
104 if (cp == (const u_char *)(ip6 + 1)
105 && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
106 (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
107 ip6addr_string(&ip6->ip6_dst));
108 }
109
110 switch (nh) {
111 case IPPROTO_HOPOPTS:
112 advance = hbhopt_print(cp);
113 nh = *cp;

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118 break;
119 case IPPROTO_FRAGMENT:
120 advance = frag6_print(cp, (const u_char *)ip6);
121 if (snapend <= cp + advance)
122 goto end;
123 nh = *cp;
124 fragmented = 1;
125 break;
126 case IPPROTO_ROUTING:
127 advance = rt6_print(cp, (const u_char *)ip6);
128 nh = *cp;
129 break;
130 case IPPROTO_TCP:
131 tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
132 (const u_char *)ip6, fragmented);
133 goto end;
134 case IPPROTO_UDP:
135 udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
136 (const u_char *)ip6, fragmented);
137 goto end;
138 case IPPROTO_ICMPV6:
139 icmp6_print(cp, (const u_char *)ip6);
140 goto end;
141 case IPPROTO_AH:
142 advance = ah_print(cp, (const u_char *)ip6);
143 nh = *cp;
144 break;
145 case IPPROTO_ESP:
146 {
147 int enh, padlen;
148 advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
149 if (enh < 0)
150 goto end;
151 nh = enh & 0xff;
152 len -= padlen;
153 break;
154 }
155#ifndef IPPROTO_IPCOMP
156#define IPPROTO_IPCOMP 108
157#endif
158 case IPPROTO_IPCOMP:
159 {
160 int enh;
161 advance = ipcomp_print(cp, (const u_char *)ip6, &enh);
162 if (enh < 0)
163 goto end;
164 nh = enh & 0xff;
165 break;
166 }
167
168#ifndef IPPROTO_PIM
169#define IPPROTO_PIM 103
170#endif
171 case IPPROTO_PIM:
172 pim_print(cp, len);
173 goto end;
174#ifndef IPPROTO_OSPF
175#define IPPROTO_OSPF 89
176#endif
177 case IPPROTO_OSPF:
178 ospf6_print(cp, len);
179 goto end;
180 case IPPROTO_IPV6:
181 ip6_print(cp, len);
182 goto end;
183#ifndef IPPROTO_IPV4
184#define IPPROTO_IPV4 4
185#endif
186 case IPPROTO_IPV4:
187 ip_print(cp, len);
188 goto end;
189 case IPPROTO_NONE:
190 (void)printf("no next header");
191 goto end;
192
193 default:
194 (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
195 goto end;
196 }
197 }
198
199 end:
200
201 flow = ntohl(ip6->ip6_flow);
202#if 0
203 /* rfc1883 */
204 if (flow & 0x0f000000)
205 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
206 if (flow & 0x00ffffff)
207 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
208#else
209 /* RFC 2460 */
210 if (flow & 0x0ff00000)
211 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
212 if (flow & 0x000fffff)
213 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
214#endif
215
216 if (ip6->ip6_hlim <= 1)
217 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
218
219 if (vflag) {
220 printf(" (");
221 (void)printf("len %d", len);
222 if (ip6->ip6_hlim > 1)
223 (void)printf(", hlim %d", (int)ip6->ip6_hlim);
224 printf(")");
225 }
226 return;
227trunc:
228 (void)printf("[|ip6]");
229}
230
231#endif /* INET6 */