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tcpdump/print-mobility.c

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/*
* Copyright (C) 2002 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project 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 BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-mobility.c,v 1.9 2003-02-05 02:36:25 guy Exp $";
#endif
#ifdef INET6
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include "ip6.h"
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
/* Mobility header */
struct ip6_mobility {
u_int8_t ip6m_pproto; /* following payload protocol (for PG) */
u_int8_t ip6m_len; /* length in units of 8 octets */
u_int8_t ip6m_type; /* message type */
u_int8_t reserved; /* reserved */
u_int16_t ip6m_cksum; /* sum of IPv6 pseudo-header and MH */
union {
u_int16_t ip6m_un_data16[1]; /* type-specific field */
u_int8_t ip6m_un_data8[2]; /* type-specific fiedl */
} ip6m_dataun;
};
#define ip6m_data16 ip6m_dataun.ip6m_un_data16
#define ip6m_data8 ip6m_dataun.ip6m_un_data8
#define IP6M_MINLEN 8
/* message type */
#define IP6M_BINDING_REQUEST 0 /* Binding Refresh Request */
#define IP6M_HOME_TEST_INIT 1 /* Home Test Init */
#define IP6M_CAREOF_TEST_INIT 2 /* Care-of Test Init */
#define IP6M_HOME_TEST 3 /* Home Test */
#define IP6M_CAREOF_TEST 4 /* Care-of Test */
#define IP6M_BINDING_UPDATE 5 /* Binding Update */
#define IP6M_BINDING_ACK 6 /* Binding Acknowledgement */
#define IP6M_BINDING_ERROR 7 /* Binding Error */
/* Mobility Header Options */
#define IP6MOPT_MINLEN 2
#define IP6MOPT_PAD1 0x0 /* Pad1 */
#define IP6MOPT_PADN 0x1 /* PadN */
#define IP6MOPT_REFRESH 0x2 /* Binding Refresh Advice */
#define IP6MOPT_REFRESH_MINLEN 4
#define IP6MOPT_ALTCOA 0x3 /* Alternate Care-of Address */
#define IP6MOPT_ALTCOA_MINLEN 18
#define IP6MOPT_NONCEID 0x4 /* Nonce Indices */
#define IP6MOPT_NONCEID_MINLEN 6
#define IP6MOPT_AUTH 0x5 /* Binding Authorization Data */
#define IP6MOPT_AUTH_MINLEN 12
static void
mobility_opt_print(const u_char *bp, int len)
{
int i;
int optlen;
for (i = 0; i < len; i += optlen) {
if (bp[i] == IP6MOPT_PAD1)
optlen = 1;
else {
if (i + 1 < len)
optlen = bp[i + 1] + 2;
else
goto trunc;
}
if (i + optlen > len)
goto trunc;
switch (bp[i]) {
case IP6MOPT_PAD1:
printf("(pad1)");
break;
case IP6MOPT_PADN:
if (len - i < IP6MOPT_MINLEN) {
printf("(padn: trunc)");
goto trunc;
}
printf("(padn)");
break;
case IP6MOPT_REFRESH:
if (len - i < IP6MOPT_REFRESH_MINLEN) {
printf("(refresh: trunc)");
goto trunc;
}
/* units of 4 secs */
printf("(refresh: %d)",
EXTRACT_16BITS(&bp[i+2]) << 2);
break;
case IP6MOPT_ALTCOA:
if (len - i < IP6MOPT_ALTCOA_MINLEN) {
printf("(altcoa: trunc)");
goto trunc;
}
printf("(alt-CoA: %s)", ip6addr_string(&bp[i+2]));
break;
case IP6MOPT_NONCEID:
if (len - i < IP6MOPT_NONCEID_MINLEN) {
printf("(ni: trunc)");
goto trunc;
}
printf("(ni: ho=0x%04x co=0x%04x)",
EXTRACT_16BITS(&bp[i+2]),
EXTRACT_16BITS(&bp[i+4]));
break;
case IP6MOPT_AUTH:
if (len - i < IP6MOPT_AUTH_MINLEN) {
printf("(auth: trunc)");
goto trunc;
}
printf("(auth)");
break;
default:
if (len - i < IP6MOPT_MINLEN) {
printf("(sopt_type %d: trunc)", bp[i]);
goto trunc;
}
printf("(type-0x%02x: len=%d)", bp[i], bp[i + 1]);
break;
}
}
return;
trunc:
printf("[trunc] ");
}
/*
* Mobility Header
*/
int
mobility_print(const u_char *bp, const u_char *bp2)
{
const struct ip6_mobility *mh;
const struct ip6_hdr *ip6;
const u_char *ep;
int mhlen, hlen, type;
mh = (struct ip6_mobility *)bp;
ip6 = (struct ip6_hdr *)bp2;
/* 'ep' points to the end of available data. */
ep = snapend;
if (!TTEST(mh->ip6m_len)) {
/*
* There's not enough captured data to include the
* mobility header length.
*
* Our caller expects us to return the length, however,
* so return a value that will run to the end of the
* captured data.
*
* XXX - "ip6_print()" doesn't do anything with the
* returned length, however, as it breaks out of the
* header-processing loop.
*/
mhlen = ep - bp;
goto trunc;
}
mhlen = (int)((mh->ip6m_len + 1) << 3);
/* XXX ip6m_cksum */
TCHECK(mh->ip6m_type);
type = mh->ip6m_type;
switch (type) {
case IP6M_BINDING_REQUEST:
printf("mobility: BRR");
hlen = IP6M_MINLEN;
break;
case IP6M_HOME_TEST_INIT:
case IP6M_CAREOF_TEST_INIT:
printf("mobility: %soTI",
type == IP6M_HOME_TEST_INIT ? "H" : "C");
hlen = IP6M_MINLEN;
if (vflag) {
TCHECK2(*mh, hlen + 8);
printf(" %s Init Cookie=%08x:%08x",
type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
EXTRACT_32BITS(&bp[hlen]),
EXTRACT_32BITS(&bp[hlen + 4]));
}
hlen += 8;
break;
case IP6M_HOME_TEST:
case IP6M_CAREOF_TEST:
printf("mobility: %soT",
type == IP6M_HOME_TEST ? "H" : "C");
TCHECK(mh->ip6m_data16[0]);
printf(" nonce id=0x%x", EXTRACT_16BITS(&mh->ip6m_data16[0]));
hlen = IP6M_MINLEN;
if (vflag) {
TCHECK2(*mh, hlen + 8);
printf(" %s Init Cookie=%08x:%08x",
type == IP6M_HOME_TEST ? "Home" : "Care-of",
EXTRACT_32BITS(&bp[hlen]),
EXTRACT_32BITS(&bp[hlen + 4]));
}
hlen += 8;
if (vflag) {
TCHECK2(*mh, hlen + 8);
printf(" %s Keygen Token=%08x:%08x",
type == IP6M_HOME_TEST ? "Home" : "Care-of",
EXTRACT_32BITS(&bp[hlen]),
EXTRACT_32BITS(&bp[hlen + 4]));
}
hlen += 8;
break;
case IP6M_BINDING_UPDATE:
printf("mobility: BU");
TCHECK(mh->ip6m_data16[0]);
printf(" seq#=%d", EXTRACT_16BITS(&mh->ip6m_data16[0]));
hlen = IP6M_MINLEN;
TCHECK2(*mh, hlen + 1);
if (bp[hlen] & 0xf0)
printf(" ");
if (bp[hlen] & 0x80)
printf("A");
if (bp[hlen] & 0x40)
printf("H");
if (bp[hlen] & 0x20)
printf("L");
if (bp[hlen] & 0x10)
printf("K");
/* Reserved (4bits) */
hlen += 1;
/* Reserved (8bits) */
hlen += 1;
TCHECK2(*mh, hlen + 2);
/* units of 4 secs */
printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
hlen += 2;
break;
case IP6M_BINDING_ACK:
printf("mobility: BA");
TCHECK(mh->ip6m_data8[0]);
printf(" status=%d", mh->ip6m_data8[0]);
if (mh->ip6m_data8[1] & 0x80)
printf(" K");
/* Reserved (7bits) */
hlen = IP6M_MINLEN;
TCHECK2(*mh, hlen + 2);
printf(" seq#=%d", EXTRACT_16BITS(&bp[hlen]));
hlen += 2;
TCHECK2(*mh, hlen + 2);
/* units of 4 secs */
printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
hlen += 2;
break;
case IP6M_BINDING_ERROR:
printf("mobility: BE");
TCHECK(mh->ip6m_data8[0]);
printf(" status=%d", mh->ip6m_data8[0]);
/* Reserved */
hlen = IP6M_MINLEN;
TCHECK2(*mh, hlen + 16);
printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
hlen += 16;
break;
default:
printf("mobility: type-#%d len=%d", type, mh->ip6m_len);
return(mhlen);
break;
}
if (vflag)
mobility_opt_print(&bp[hlen], mhlen - hlen);
return(mhlen);
trunc:
fputs("[|MOBILITY]", stdout);
return(mhlen);
}
#endif /* INET6 */
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