2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
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
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.
23 static const char rcsid[] _U_ =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.52 2007-09-21 07:05:33 hannes Exp $";
33 #include <tcpdump-stdinc.h>
39 #include "netdissect.h"
40 #include "interface.h"
41 #include "addrtoname.h"
48 * Compute a V6-style checksum by building a pseudoheader.
51 nextproto6_cksum(const struct ip6_hdr *ip6, const u_int8_t *data,
52 u_int len, u_int next_proto)
55 struct in6_addr ph_src;
56 struct in6_addr ph_dst;
61 struct cksum_vec vec[2];
64 memset(&ph, 0, sizeof(ph));
65 ph.ph_src = ip6->ip6_src;
66 ph.ph_dst = ip6->ip6_dst;
67 ph.ph_len = htonl(len);
68 ph.ph_nxt = next_proto;
70 vec[0].ptr = (const u_int8_t *)(void *)&ph;
71 vec[0].len = sizeof(ph);
75 return in_cksum(vec, 2);
79 * print an IP6 datagram.
82 ip6_print(netdissect_options *ndo, const u_char *bp, u_int length)
84 register const struct ip6_hdr *ip6;
88 register const u_char *cp;
89 register u_int payload_len;
94 ip6 = (const struct ip6_hdr *)bp;
97 if (length < sizeof (struct ip6_hdr)) {
98 (void)ND_PRINT((ndo, "truncated-ip6 %u", length));
103 ND_PRINT((ndo, "IP6 "));
105 payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
106 len = payload_len + sizeof(struct ip6_hdr);
108 (void)ND_PRINT((ndo, "truncated-ip6 - %u bytes missing!",
111 if (ndo->ndo_vflag) {
112 flow = EXTRACT_32BITS(&ip6->ip6_flow);
113 ND_PRINT((ndo, "("));
116 if (flow & 0x0f000000)
117 (void)ND_PRINT((ndo, "pri 0x%02x, ", (flow & 0x0f000000) >> 24));
118 if (flow & 0x00ffffff)
119 (void)ND_PRINT((ndo, "flowlabel 0x%06x, ", flow & 0x00ffffff));
122 if (flow & 0x0ff00000)
123 (void)ND_PRINT((ndo, "class 0x%02x, ", (flow & 0x0ff00000) >> 20));
124 if (flow & 0x000fffff)
125 (void)ND_PRINT((ndo, "flowlabel 0x%05x, ", flow & 0x000fffff));
128 (void)ND_PRINT((ndo, "hlim %u, next-header %s (%u) payload length: %u) ",
130 tok2str(ipproto_values,"unknown",ip6->ip6_nxt),
136 * Cut off the snapshot length to the end of the IP payload.
139 if (ipend < ndo->ndo_snapend)
140 ndo->ndo_snapend = ipend;
142 cp = (const u_char *)ip6;
143 advance = sizeof(struct ip6_hdr);
145 while (cp < ndo->ndo_snapend && advance > 0) {
149 if (cp == (const u_char *)(ip6 + 1) &&
150 nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
151 nh != IPPROTO_DCCP && nh != IPPROTO_SCTP) {
152 (void)ND_PRINT((ndo, "%s > %s: ", ip6addr_string(&ip6->ip6_src),
153 ip6addr_string(&ip6->ip6_dst)));
157 case IPPROTO_HOPOPTS:
158 advance = hbhopt_print(cp);
161 case IPPROTO_DSTOPTS:
162 advance = dstopt_print(cp);
165 case IPPROTO_FRAGMENT:
166 advance = frag6_print(cp, (const u_char *)ip6);
167 if (ndo->ndo_snapend <= cp + advance)
173 case IPPROTO_MOBILITY_OLD:
174 case IPPROTO_MOBILITY:
176 * XXX - we don't use "advance"; the current
177 * "Mobility Support in IPv6" draft
178 * (draft-ietf-mobileip-ipv6-24) says that
179 * the next header field in a mobility header
180 * should be IPPROTO_NONE, but speaks of
181 * the possiblity of a future extension in
182 * which payload can be piggybacked atop a
185 advance = mobility_print(cp, (const u_char *)ip6);
188 case IPPROTO_ROUTING:
189 advance = rt6_print(cp, (const u_char *)ip6);
193 sctp_print(cp, (const u_char *)ip6, len);
196 dccp_print(cp, (const u_char *)ip6, len);
199 tcp_print(cp, len, (const u_char *)ip6, fragmented);
202 udp_print(cp, len, (const u_char *)ip6, fragmented);
205 icmp6_print(ndo, cp, len, (const u_char *)ip6, fragmented);
208 advance = ah_print(cp);
214 advance = esp_print(ndo, cp, len, (const u_char *)ip6, &enh, &padlen);
222 advance = ipcomp_print(cp, &enh);
228 pim_print(cp, len, nextproto6_cksum(ip6, cp, len,
233 ospf6_print(cp, len);
237 ip6_print(ndo, cp, len);
241 ip_print(ndo, cp, len);
245 pgm_print(cp, len, (const u_char *)ip6);
257 (void)ND_PRINT((ndo, "no next header"));
261 (void)ND_PRINT((ndo, "ip-proto-%d %d", nh, len));
268 (void)ND_PRINT((ndo, "[|ip6]"));