mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-30 21:44:49 +08:00
11f73ad248
Have our own routines to convert between IPv4/IPv6 addresses and strings; that helps if, for example, we want to build binary versions of tcpdump for Windows that can run both on NT 5 (W2K/WXP), which doesn't have inet_ntop() or inet_pton(), and NT 6 (Vista/7/8/10), which do. It also means that we don't require IPv6 library support on UN*X to print addresses (if somebody wants to build tcpdump for older UN*Xes lacking IPv6 support in the system library or in add-on libraries). Get rid of files in the missing directory that we don't need, and various no-longer-necessary autoconf tests.
264 lines
6.9 KiB
C
264 lines
6.9 KiB
C
/*
|
|
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that: (1) source code distributions
|
|
* retain the above copyright notice and this paragraph in its entirety, (2)
|
|
* distributions including binary code include the above copyright notice and
|
|
* this paragraph in its entirety in the documentation or other materials
|
|
* provided with the distribution, and (3) all advertising materials mentioning
|
|
* features or use of this software display the following acknowledgement:
|
|
* ``This product includes software developed by the University of California,
|
|
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
* the University nor the names of its contributors may be used to endorse
|
|
* or promote products derived from this software without specific prior
|
|
* written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <netdissect-stdinc.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include "netdissect.h"
|
|
#include "addrtoname.h"
|
|
#include "extract.h"
|
|
|
|
#include "ip6.h"
|
|
#include "ipproto.h"
|
|
|
|
/*
|
|
* Compute a V6-style checksum by building a pseudoheader.
|
|
*/
|
|
int
|
|
nextproto6_cksum(const struct ip6_hdr *ip6, const uint8_t *data,
|
|
u_int len, u_int covlen, u_int next_proto)
|
|
{
|
|
struct {
|
|
struct in6_addr ph_src;
|
|
struct in6_addr ph_dst;
|
|
uint32_t ph_len;
|
|
uint8_t ph_zero[3];
|
|
uint8_t ph_nxt;
|
|
} ph;
|
|
struct cksum_vec vec[2];
|
|
|
|
/* pseudo-header */
|
|
memset(&ph, 0, sizeof(ph));
|
|
UNALIGNED_MEMCPY(&ph.ph_src, &ip6->ip6_src, sizeof (struct in6_addr));
|
|
UNALIGNED_MEMCPY(&ph.ph_dst, &ip6->ip6_dst, sizeof (struct in6_addr));
|
|
ph.ph_len = htonl(len);
|
|
ph.ph_nxt = next_proto;
|
|
|
|
vec[0].ptr = (const uint8_t *)(void *)&ph;
|
|
vec[0].len = sizeof(ph);
|
|
vec[1].ptr = data;
|
|
vec[1].len = covlen;
|
|
|
|
return in_cksum(vec, 2);
|
|
}
|
|
|
|
/*
|
|
* print an IP6 datagram.
|
|
*/
|
|
void
|
|
ip6_print(netdissect_options *ndo, const u_char *bp, u_int length)
|
|
{
|
|
register const struct ip6_hdr *ip6;
|
|
register int advance;
|
|
u_int len;
|
|
const u_char *ipend;
|
|
register const u_char *cp;
|
|
register u_int payload_len;
|
|
int nh;
|
|
int fragmented = 0;
|
|
u_int flow;
|
|
|
|
ip6 = (const struct ip6_hdr *)bp;
|
|
|
|
ND_TCHECK(*ip6);
|
|
if (length < sizeof (struct ip6_hdr)) {
|
|
ND_PRINT((ndo, "truncated-ip6 %u", length));
|
|
return;
|
|
}
|
|
|
|
if (!ndo->ndo_eflag)
|
|
ND_PRINT((ndo, "IP6 "));
|
|
|
|
if (IP6_VERSION(ip6) != 6) {
|
|
ND_PRINT((ndo,"version error: %u != 6", IP6_VERSION(ip6)));
|
|
return;
|
|
}
|
|
|
|
payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
|
|
len = payload_len + sizeof(struct ip6_hdr);
|
|
if (length < len)
|
|
ND_PRINT((ndo, "truncated-ip6 - %u bytes missing!",
|
|
len - length));
|
|
|
|
if (ndo->ndo_vflag) {
|
|
flow = EXTRACT_32BITS(&ip6->ip6_flow);
|
|
ND_PRINT((ndo, "("));
|
|
#if 0
|
|
/* rfc1883 */
|
|
if (flow & 0x0f000000)
|
|
ND_PRINT((ndo, "pri 0x%02x, ", (flow & 0x0f000000) >> 24));
|
|
if (flow & 0x00ffffff)
|
|
ND_PRINT((ndo, "flowlabel 0x%06x, ", flow & 0x00ffffff));
|
|
#else
|
|
/* RFC 2460 */
|
|
if (flow & 0x0ff00000)
|
|
ND_PRINT((ndo, "class 0x%02x, ", (flow & 0x0ff00000) >> 20));
|
|
if (flow & 0x000fffff)
|
|
ND_PRINT((ndo, "flowlabel 0x%05x, ", flow & 0x000fffff));
|
|
#endif
|
|
|
|
ND_PRINT((ndo, "hlim %u, next-header %s (%u) payload length: %u) ",
|
|
ip6->ip6_hlim,
|
|
tok2str(ipproto_values,"unknown",ip6->ip6_nxt),
|
|
ip6->ip6_nxt,
|
|
payload_len));
|
|
}
|
|
|
|
/*
|
|
* Cut off the snapshot length to the end of the IP payload.
|
|
*/
|
|
ipend = bp + len;
|
|
if (ipend < ndo->ndo_snapend)
|
|
ndo->ndo_snapend = ipend;
|
|
|
|
cp = (const u_char *)ip6;
|
|
advance = sizeof(struct ip6_hdr);
|
|
nh = ip6->ip6_nxt;
|
|
while (cp < ndo->ndo_snapend && advance > 0) {
|
|
cp += advance;
|
|
len -= advance;
|
|
|
|
if (cp == (const u_char *)(ip6 + 1) &&
|
|
nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
|
|
nh != IPPROTO_DCCP && nh != IPPROTO_SCTP) {
|
|
ND_PRINT((ndo, "%s > %s: ", ip6addr_string(ndo, &ip6->ip6_src),
|
|
ip6addr_string(ndo, &ip6->ip6_dst)));
|
|
}
|
|
|
|
switch (nh) {
|
|
case IPPROTO_HOPOPTS:
|
|
advance = hbhopt_print(ndo, cp);
|
|
nh = *cp;
|
|
break;
|
|
case IPPROTO_DSTOPTS:
|
|
advance = dstopt_print(ndo, cp);
|
|
nh = *cp;
|
|
break;
|
|
case IPPROTO_FRAGMENT:
|
|
advance = frag6_print(ndo, cp, (const u_char *)ip6);
|
|
if (ndo->ndo_snapend <= cp + advance)
|
|
return;
|
|
nh = *cp;
|
|
fragmented = 1;
|
|
break;
|
|
|
|
case IPPROTO_MOBILITY_OLD:
|
|
case IPPROTO_MOBILITY:
|
|
/*
|
|
* XXX - we don't use "advance"; the current
|
|
* "Mobility Support in IPv6" draft
|
|
* (draft-ietf-mobileip-ipv6-24) says that
|
|
* the next header field in a mobility header
|
|
* should be IPPROTO_NONE, but speaks of
|
|
* the possiblity of a future extension in
|
|
* which payload can be piggybacked atop a
|
|
* mobility header.
|
|
*/
|
|
advance = mobility_print(ndo, cp, (const u_char *)ip6);
|
|
nh = *cp;
|
|
return;
|
|
case IPPROTO_ROUTING:
|
|
advance = rt6_print(ndo, cp, (const u_char *)ip6);
|
|
nh = *cp;
|
|
break;
|
|
case IPPROTO_SCTP:
|
|
sctp_print(ndo, cp, (const u_char *)ip6, len);
|
|
return;
|
|
case IPPROTO_DCCP:
|
|
dccp_print(ndo, cp, (const u_char *)ip6, len);
|
|
return;
|
|
case IPPROTO_TCP:
|
|
tcp_print(ndo, cp, len, (const u_char *)ip6, fragmented);
|
|
return;
|
|
case IPPROTO_UDP:
|
|
udp_print(ndo, cp, len, (const u_char *)ip6, fragmented);
|
|
return;
|
|
case IPPROTO_ICMPV6:
|
|
icmp6_print(ndo, cp, len, (const u_char *)ip6, fragmented);
|
|
return;
|
|
case IPPROTO_AH:
|
|
advance = ah_print(ndo, cp);
|
|
nh = *cp;
|
|
break;
|
|
case IPPROTO_ESP:
|
|
{
|
|
int enh, padlen;
|
|
advance = esp_print(ndo, cp, len, (const u_char *)ip6, &enh, &padlen);
|
|
nh = enh & 0xff;
|
|
len -= padlen;
|
|
break;
|
|
}
|
|
case IPPROTO_IPCOMP:
|
|
{
|
|
int enh;
|
|
advance = ipcomp_print(ndo, cp, &enh);
|
|
nh = enh & 0xff;
|
|
break;
|
|
}
|
|
|
|
case IPPROTO_PIM:
|
|
pim_print(ndo, cp, len, (const u_char *)ip6);
|
|
return;
|
|
|
|
case IPPROTO_OSPF:
|
|
ospf6_print(ndo, cp, len);
|
|
return;
|
|
|
|
case IPPROTO_IPV6:
|
|
ip6_print(ndo, cp, len);
|
|
return;
|
|
|
|
case IPPROTO_IPV4:
|
|
ip_print(ndo, cp, len);
|
|
return;
|
|
|
|
case IPPROTO_PGM:
|
|
pgm_print(ndo, cp, len, (const u_char *)ip6);
|
|
return;
|
|
|
|
case IPPROTO_GRE:
|
|
gre_print(ndo, cp, len);
|
|
return;
|
|
|
|
case IPPROTO_RSVP:
|
|
rsvp_print(ndo, cp, len);
|
|
return;
|
|
|
|
case IPPROTO_NONE:
|
|
ND_PRINT((ndo, "no next header"));
|
|
return;
|
|
|
|
default:
|
|
ND_PRINT((ndo, "ip-proto-%d %d", nh, len));
|
|
return;
|
|
}
|
|
}
|
|
|
|
return;
|
|
trunc:
|
|
ND_PRINT((ndo, "[|ip6]"));
|
|
}
|