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[FreeBSD/FreeBSD.git] / contrib / tcpdump / print-ip6.c
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
9  * this paragraph in its entirety in the documentation or other materials
10  * provided with the distribution, and (3) all advertising materials mentioning
11  * features or use of this software display the following acknowledgement:
12  * ``This product includes software developed by the University of California,
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  * $FreeBSD$
22  */
23
24 #ifndef lint
25 static const char rcsid[] =
26     "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.16 2000/11/17 19:08:15 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  */
55 void
56 ip6_print(register const u_char *bp, register int length)
57 {
58         register const struct ip6_hdr *ip6;
59         register int advance;
60         register 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          * This will never happen with BPF.  It does happen raw packet
72          * dumps from -r.
73          */
74         if ((u_long)ip6 & 15) {
75                 static u_char *abuf;
76
77                 if (abuf == NULL)
78                         abuf = malloc(snaplen);
79                 memcpy(abuf, ip6, min(length, snaplen));
80                 snapend += abuf - (u_char *)ip6;
81                 packetp = abuf;
82                 ip6 = (struct ip6_hdr *)abuf;
83         }
84 #endif
85         if ((u_char *)(ip6 + 1) > snapend) {
86                 printf("[|ip6]");
87                 return;
88         }
89         if (length < sizeof (struct ip6_hdr)) {
90                 (void)printf("truncated-ip6 %d", length);
91                 return;
92         }
93         advance = sizeof(struct ip6_hdr);
94
95         len = ntohs(ip6->ip6_plen);
96         if (length < len + advance)
97                 (void)printf("truncated-ip6 - %d bytes missing!",
98                         len + advance - length);
99
100         cp = (const u_char *)ip6;
101         nh = ip6->ip6_nxt;
102         while (cp < snapend) {
103                 cp += advance;
104
105                 if (cp == (u_char *)(ip6 + 1)
106                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
107                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
108                                      ip6addr_string(&ip6->ip6_dst));
109                 }
110
111                 switch (nh) {
112                 case IPPROTO_HOPOPTS:
113                         advance = hbhopt_print(cp);
114                         nh = *cp;
115                         break;
116                 case IPPROTO_DSTOPTS:
117                         advance = dstopt_print(cp);
118                         nh = *cp;
119                         break;
120                 case IPPROTO_FRAGMENT:
121                         advance = frag6_print(cp, (const u_char *)ip6);
122                         if (snapend <= cp + advance)
123                                 goto end;
124                         nh = *cp;
125                         fragmented = 1;
126                         break;
127                 case IPPROTO_ROUTING:
128                         advance = rt6_print(cp, (const u_char *)ip6);
129                         nh = *cp;
130                         break;
131                 case IPPROTO_TCP:
132                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
133                                 (const u_char *)ip6, fragmented);
134                         goto end;
135                 case IPPROTO_UDP:
136                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
137                                 (const u_char *)ip6, fragmented);
138                         goto end;
139                 case IPPROTO_ICMPV6:
140                         icmp6_print(cp, (const u_char *)ip6);
141                         goto end;
142                 case IPPROTO_AH:
143                         advance = ah_print(cp, (const u_char *)ip6);
144                         nh = *cp;
145                         break;
146                 case IPPROTO_ESP:
147                     {
148                         int enh;
149                         advance = esp_print(cp, (const u_char *)ip6, &enh);
150                         if (enh < 0)
151                                 goto end;
152                         nh = enh & 0xff;
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 }
227
228 #endif /* INET6 */