29e5988b19e9ebb2f57600508b5f098515a0f409
[dragonfly.git] / contrib / tcpdump-3.9 / 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
22 #ifndef lint
23 static const char rcsid[] _U_ =
24     "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.47.2.5 2007/09/21 07:07:52 hannes Exp $";
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #ifdef INET6
32
33 #include <tcpdump-stdinc.h>
34
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38
39 #include "interface.h"
40 #include "addrtoname.h"
41 #include "extract.h"
42
43 #include "ip6.h"
44 #include "ipproto.h"
45
46 /*
47  * print an IP6 datagram.
48  */
49 void
50 ip6_print(register const u_char *bp, register u_int length)
51 {
52         register const struct ip6_hdr *ip6;
53         register int advance;
54         u_int len;
55         const u_char *ipend;
56         register const u_char *cp;
57         register u_int payload_len;
58         int nh;
59         int fragmented = 0;
60         u_int flow;
61
62         ip6 = (const struct ip6_hdr *)bp;
63
64         TCHECK(*ip6);
65         if (length < sizeof (struct ip6_hdr)) {
66                 (void)printf("truncated-ip6 %u", length);
67                 return;
68         }
69
70         if (!eflag)
71             printf("IP6 ");
72
73         payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
74         len = payload_len + sizeof(struct ip6_hdr);
75         if (length < len)
76                 (void)printf("truncated-ip6 - %u bytes missing!",
77                         len - length);
78
79         if (vflag) {
80             flow = EXTRACT_32BITS(&ip6->ip6_flow);
81             printf("(");
82 #if 0
83             /* rfc1883 */
84             if (flow & 0x0f000000)
85                 (void)printf("pri 0x%02x, ", (flow & 0x0f000000) >> 24);
86             if (flow & 0x00ffffff)
87                 (void)printf("flowlabel 0x%06x, ", flow & 0x00ffffff);
88 #else
89             /* RFC 2460 */
90             if (flow & 0x0ff00000)
91                 (void)printf("class 0x%02x, ", (flow & 0x0ff00000) >> 20);
92             if (flow & 0x000fffff)
93                 (void)printf("flowlabel 0x%05x, ", flow & 0x000fffff);
94 #endif
95
96             (void)printf("hlim %u, next-header %s (%u) payload length: %u) ",
97                          ip6->ip6_hlim,
98                          tok2str(ipproto_values,"unknown",ip6->ip6_nxt),
99                          ip6->ip6_nxt,
100                          payload_len);
101         }
102
103         /*
104          * Cut off the snapshot length to the end of the IP payload.
105          */
106         ipend = bp + len;
107         if (ipend < snapend)
108                 snapend = ipend;
109
110         cp = (const u_char *)ip6;
111         advance = sizeof(struct ip6_hdr);
112         nh = ip6->ip6_nxt;
113         while (cp < snapend && advance > 0) {
114                 cp += advance;
115                 len -= advance;
116
117                 if (cp == (const u_char *)(ip6 + 1) &&
118                     nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
119                     nh != IPPROTO_DCCP && nh != IPPROTO_SCTP) {
120                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
121                                      ip6addr_string(&ip6->ip6_dst));
122                 }
123
124                 switch (nh) {
125                 case IPPROTO_HOPOPTS:
126                         advance = hbhopt_print(cp);
127                         nh = *cp;
128                         break;
129                 case IPPROTO_DSTOPTS:
130                         advance = dstopt_print(cp);
131                         nh = *cp;
132                         break;
133                 case IPPROTO_FRAGMENT:
134                         advance = frag6_print(cp, (const u_char *)ip6);
135                         if (snapend <= cp + advance)
136                                 return;
137                         nh = *cp;
138                         fragmented = 1;
139                         break;
140
141                 case IPPROTO_MOBILITY_OLD:
142                 case IPPROTO_MOBILITY:
143                         /*
144                          * XXX - we don't use "advance"; the current
145                          * "Mobility Support in IPv6" draft
146                          * (draft-ietf-mobileip-ipv6-24) says that
147                          * the next header field in a mobility header
148                          * should be IPPROTO_NONE, but speaks of
149                          * the possiblity of a future extension in
150                          * which payload can be piggybacked atop a
151                          * mobility header.
152                          */
153                         advance = mobility_print(cp, (const u_char *)ip6);
154                         nh = *cp;
155                         return;
156                 case IPPROTO_ROUTING:
157                         advance = rt6_print(cp, (const u_char *)ip6);
158                         nh = *cp;
159                         break;
160                 case IPPROTO_SCTP:
161                         sctp_print(cp, (const u_char *)ip6, len);
162                         return;
163                 case IPPROTO_DCCP:
164                         dccp_print(cp, (const u_char *)ip6, len);
165                         return;
166                 case IPPROTO_TCP:
167                         tcp_print(cp, len, (const u_char *)ip6, fragmented);
168                         return;
169                 case IPPROTO_UDP:
170                         udp_print(cp, len, (const u_char *)ip6, fragmented);
171                         return;
172                 case IPPROTO_ICMPV6:
173                         icmp6_print(cp, len, (const u_char *)ip6, fragmented);
174                         return;
175                 case IPPROTO_AH:
176                         advance = ah_print(cp);
177                         nh = *cp;
178                         break;
179                 case IPPROTO_ESP:
180                     {
181                         int enh, padlen;
182                         advance = esp_print(gndo, cp, len, (const u_char *)ip6, &enh, &padlen);
183                         nh = enh & 0xff;
184                         len -= padlen;
185                         break;
186                     }
187                 case IPPROTO_IPCOMP:
188                     {
189                         int enh;
190                         advance = ipcomp_print(cp, &enh);
191                         nh = enh & 0xff;
192                         break;
193                     }
194
195                 case IPPROTO_PIM:
196                         pim_print(cp, len);
197                         return;
198
199                 case IPPROTO_OSPF:
200                         ospf6_print(cp, len);
201                         return;
202
203                 case IPPROTO_IPV6:
204                         ip6_print(cp, len);
205                         return;
206
207                 case IPPROTO_IPV4:
208                         ip_print(gndo, cp, len);
209                         return;
210
211                 case IPPROTO_PGM:
212                         pgm_print(cp, len, (const u_char *)ip6);
213                         return;
214
215                 case IPPROTO_GRE:
216                         gre_print(cp, len);
217                         return;
218
219                 case IPPROTO_RSVP:
220                         rsvp_print(cp, len);
221                         return;
222
223                 case IPPROTO_NONE:
224                         (void)printf("no next header");
225                         return;
226
227                 default:
228                         (void)printf("ip-proto-%d %d", nh, len);
229                         return;
230                 }
231         }
232
233         return;
234 trunc:
235         (void)printf("[|ip6]");
236 }
237
238 #endif /* INET6 */