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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 1.21 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  */
55 void
56 ip6_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;
114                         break;
115                 case IPPROTO_DSTOPTS:
116                         advance = dstopt_print(cp);
117                         nh = *cp;
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;
227 trunc:
228         (void)printf("[|ip6]");
229 }
230
231 #endif /* INET6 */