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.
25 static const char rcsid[] _U_ =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.52 2007-09-21 07:05:33 hannes Exp $";
35 #include <tcpdump-stdinc.h>
41 #include "netdissect.h"
42 #include "interface.h"
43 #include "addrtoname.h"
50 * Compute a V6-style checksum by building a pseudoheader.
53 nextproto6_cksum(const struct ip6_hdr *ip6, const u_int8_t *data,
54 u_int len, u_int next_proto)
57 struct in6_addr ph_src;
58 struct in6_addr ph_dst;
63 struct cksum_vec vec[2];
66 memset(&ph, 0, sizeof(ph));
67 ph.ph_src = ip6->ip6_src;
68 ph.ph_dst = ip6->ip6_dst;
69 ph.ph_len = htonl(len);
70 ph.ph_nxt = next_proto;
72 vec[0].ptr = (const u_int8_t *)(void *)&ph;
73 vec[0].len = sizeof(ph);
77 return in_cksum(vec, 2);
81 * print an IP6 datagram.
84 ip6_print(netdissect_options *ndo, const u_char *bp, u_int length)
86 register const struct ip6_hdr *ip6;
90 register const u_char *cp;
91 register u_int payload_len;
96 ip6 = (const struct ip6_hdr *)bp;
99 if (length < sizeof (struct ip6_hdr)) {
100 (void)ND_PRINT((ndo, "truncated-ip6 %u", length));
105 ND_PRINT((ndo, "IP6 "));
107 payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
108 len = payload_len + sizeof(struct ip6_hdr);
110 (void)ND_PRINT((ndo, "truncated-ip6 - %u bytes missing!",
113 if (ndo->ndo_vflag) {
114 flow = EXTRACT_32BITS(&ip6->ip6_flow);
115 ND_PRINT((ndo, "("));
118 if (flow & 0x0f000000)
119 (void)ND_PRINT((ndo, "pri 0x%02x, ", (flow & 0x0f000000) >> 24));
120 if (flow & 0x00ffffff)
121 (void)ND_PRINT((ndo, "flowlabel 0x%06x, ", flow & 0x00ffffff));
124 if (flow & 0x0ff00000)
125 (void)ND_PRINT((ndo, "class 0x%02x, ", (flow & 0x0ff00000) >> 20));
126 if (flow & 0x000fffff)
127 (void)ND_PRINT((ndo, "flowlabel 0x%05x, ", flow & 0x000fffff));
130 (void)ND_PRINT((ndo, "hlim %u, next-header %s (%u) payload length: %u) ",
132 tok2str(ipproto_values,"unknown",ip6->ip6_nxt),
138 * Cut off the snapshot length to the end of the IP payload.
141 if (ipend < ndo->ndo_snapend)
142 ndo->ndo_snapend = ipend;
144 cp = (const u_char *)ip6;
145 advance = sizeof(struct ip6_hdr);
147 while (cp < ndo->ndo_snapend && advance > 0) {
151 if (cp == (const u_char *)(ip6 + 1) &&
152 nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
153 nh != IPPROTO_DCCP && nh != IPPROTO_SCTP) {
154 (void)ND_PRINT((ndo, "%s > %s: ", ip6addr_string(&ip6->ip6_src),
155 ip6addr_string(&ip6->ip6_dst)));
159 case IPPROTO_HOPOPTS:
160 advance = hbhopt_print(cp);
163 case IPPROTO_DSTOPTS:
164 advance = dstopt_print(cp);
167 case IPPROTO_FRAGMENT:
168 advance = frag6_print(cp, (const u_char *)ip6);
169 if (ndo->ndo_snapend <= cp + advance)
175 case IPPROTO_MOBILITY_OLD:
176 case IPPROTO_MOBILITY:
178 * XXX - we don't use "advance"; the current
179 * "Mobility Support in IPv6" draft
180 * (draft-ietf-mobileip-ipv6-24) says that
181 * the next header field in a mobility header
182 * should be IPPROTO_NONE, but speaks of
183 * the possiblity of a future extension in
184 * which payload can be piggybacked atop a
187 advance = mobility_print(cp, (const u_char *)ip6);
190 case IPPROTO_ROUTING:
191 advance = rt6_print(cp, (const u_char *)ip6);
195 sctp_print(cp, (const u_char *)ip6, len);
198 dccp_print(cp, (const u_char *)ip6, len);
201 tcp_print(cp, len, (const u_char *)ip6, fragmented);
204 udp_print(cp, len, (const u_char *)ip6, fragmented);
207 icmp6_print(ndo, cp, len, (const u_char *)ip6, fragmented);
210 advance = ah_print(cp);
216 advance = esp_print(ndo, cp, len, (const u_char *)ip6, &enh, &padlen);
224 advance = ipcomp_print(cp, &enh);
230 pim_print(cp, len, nextproto6_cksum(ip6, cp, len,
235 ospf6_print(cp, len);
239 ip6_print(ndo, cp, len);
243 ip_print(ndo, cp, len);
247 pgm_print(cp, len, (const u_char *)ip6);
259 (void)ND_PRINT((ndo, "no next header"));
263 (void)ND_PRINT((ndo, "ip-proto-%d %d", nh, len));
270 (void)ND_PRINT((ndo, "[|ip6]"));