print-mobility.c - platform/external/tcpdump - Git at Google

 /*
  * 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.
  */

 /* \summary: IPv6 mobility printer */
 /* RFC 3775 */

 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif

 #include "netdissect-stdinc.h"

 #include "netdissect.h"
 #include "addrtoname.h"
 #include "extract.h"

 #include "ip6.h"


 /* Mobility header */
 struct ip6_mobility {
 	nd_uint8_t ip6m_pproto;	/* following payload protocol (for PG) */
 	nd_uint8_t ip6m_len;	/* length in units of 8 octets */
 	nd_uint8_t ip6m_type;	/* message type */
 	nd_uint8_t reserved;	/* reserved */
 	nd_uint16_t ip6m_cksum;	/* sum of IPv6 pseudo-header and MH */
 	union {
 		nd_uint16_t	ip6m_un_data16[1]; /* type-specific field */
 		nd_uint8_t	ip6m_un_data8[2];  /* type-specific field */
 	} ip6m_dataun;
 };

 #define ip6m_data16	ip6m_dataun.ip6m_un_data16
 #define ip6m_data8	ip6m_dataun.ip6m_un_data8

 #define IP6M_MINLEN	8

 /* http://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */

 /* 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 */
 #define IP6M_MAX		7

 static const struct tok ip6m_str[] = {
 	{ IP6M_BINDING_REQUEST,  "BRR"  },
 	{ IP6M_HOME_TEST_INIT,   "HoTI" },
 	{ IP6M_CAREOF_TEST_INIT, "CoTI" },
 	{ IP6M_HOME_TEST,        "HoT"  },
 	{ IP6M_CAREOF_TEST,      "CoT"  },
 	{ IP6M_BINDING_UPDATE,   "BU"   },
 	{ IP6M_BINDING_ACK,      "BA"   },
 	{ IP6M_BINDING_ERROR,    "BE"   },
 	{ 0, NULL }
 };

 static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = {
 	IP6M_MINLEN,      /* IP6M_BINDING_REQUEST  */
 	IP6M_MINLEN + 8,  /* IP6M_HOME_TEST_INIT   */
 	IP6M_MINLEN + 8,  /* IP6M_CAREOF_TEST_INIT */
 	IP6M_MINLEN + 16, /* IP6M_HOME_TEST        */
 	IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST      */
 	IP6M_MINLEN + 4,  /* IP6M_BINDING_UPDATE   */
 	IP6M_MINLEN + 4,  /* IP6M_BINDING_ACK      */
 	IP6M_MINLEN + 16, /* IP6M_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 int
 mobility_opt_print(netdissect_options *ndo,
                    const u_char *bp, const unsigned len)
 {
 	unsigned i, optlen;

 	for (i = 0; i < len; i += optlen) {
 		ND_TCHECK_1(bp + i);
 		if (EXTRACT_U_1(bp + i) == IP6MOPT_PAD1)
 			optlen = 1;
 		else {
 			if (i + 1 < len) {
 				ND_TCHECK_1(bp + i + 1);
 				optlen = EXTRACT_U_1(bp + i + 1) + 2;
 			}
 			else
 				goto trunc;
 		}
 		if (i + optlen > len)
 			goto trunc;
 		ND_TCHECK_1(bp + i + optlen);

 		switch (EXTRACT_U_1(bp + i)) {
 		case IP6MOPT_PAD1:
 			ND_PRINT("(pad1)");
 			break;
 		case IP6MOPT_PADN:
 			if (len - i < IP6MOPT_MINLEN) {
 				ND_PRINT("(padn: trunc)");
 				goto trunc;
 			}
 			ND_PRINT("(padn)");
 			break;
 		case IP6MOPT_REFRESH:
 			if (len - i < IP6MOPT_REFRESH_MINLEN) {
 				ND_PRINT("(refresh: trunc)");
 				goto trunc;
 			}
 			/* units of 4 secs */
 			ND_TCHECK_2(bp + i + 2);
 			ND_PRINT("(refresh: %u)",
 				EXTRACT_BE_U_2(bp + i + 2) << 2);
 			break;
 		case IP6MOPT_ALTCOA:
 			if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 				ND_PRINT("(altcoa: trunc)");
 				goto trunc;
 			}
 			ND_TCHECK_16(bp + i + 2);
 			ND_PRINT("(alt-CoA: %s)", ip6addr_string(ndo, bp + i + 2));
 			break;
 		case IP6MOPT_NONCEID:
 			if (len - i < IP6MOPT_NONCEID_MINLEN) {
 				ND_PRINT("(ni: trunc)");
 				goto trunc;
 			}
 			ND_TCHECK_2(bp + i + 2);
 			ND_TCHECK_2(bp + i + 4);
 			ND_PRINT("(ni: ho=0x%04x co=0x%04x)",
 				EXTRACT_BE_U_2(bp + i + 2),
 				EXTRACT_BE_U_2(bp + i + 4));
 			break;
 		case IP6MOPT_AUTH:
 			if (len - i < IP6MOPT_AUTH_MINLEN) {
 				ND_PRINT("(auth: trunc)");
 				goto trunc;
 			}
 			ND_PRINT("(auth)");
 			break;
 		default:
 			if (len - i < IP6MOPT_MINLEN) {
 				ND_PRINT("(sopt_type %u: trunc)", EXTRACT_U_1(bp + i));
 				goto trunc;
 			}
 			ND_PRINT("(type-0x%02x: len=%u)", EXTRACT_U_1(bp + i), EXTRACT_U_1(bp + i + 1));
 			break;
 		}
 	}
 	return 0;

 trunc:
 	return 1;
 }

 /*
  * Mobility Header
  */
 int
 mobility_print(netdissect_options *ndo,
                const u_char *bp, const u_char *bp2 _U_)
 {
 	const struct ip6_mobility *mh;
 	const u_char *ep;
 	unsigned mhlen, hlen;
 	uint8_t type;

 	ndo->ndo_protocol = "mobility";
 	mh = (const struct ip6_mobility *)bp;

 	/* 'ep' points to the end of available data. */
 	ep = ndo->ndo_snapend;

 	if (!ND_TTEST_1(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 = (EXTRACT_U_1(mh->ip6m_len) + 1) << 3;

 	/* XXX ip6m_cksum */

 	ND_TCHECK_1(mh->ip6m_type);
 	type = EXTRACT_U_1(mh->ip6m_type);
 	if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) {
 		ND_PRINT("(header length %u is too small for type %u)", mhlen, type);
 		goto trunc;
 	}
 	ND_PRINT("mobility: %s", tok2str(ip6m_str, "type-#%u", type));
 	switch (type) {
 	case IP6M_BINDING_REQUEST:
 		hlen = IP6M_MINLEN;
 		break;
 	case IP6M_HOME_TEST_INIT:
 	case IP6M_CAREOF_TEST_INIT:
 		hlen = IP6M_MINLEN;
 		if (ndo->ndo_vflag) {
 			ND_TCHECK_4(bp + hlen + 4);
 			ND_PRINT(" %s Init Cookie=%08x:%08x",
 			       type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
 			       EXTRACT_BE_U_4(bp + hlen),
 			       EXTRACT_BE_U_4(bp + hlen + 4));
 		}
 		hlen += 8;
 		break;
 	case IP6M_HOME_TEST:
 	case IP6M_CAREOF_TEST:
 		ND_TCHECK_2(mh->ip6m_data16[0]);
 		ND_PRINT(" nonce id=0x%x", EXTRACT_BE_U_2(mh->ip6m_data16[0]));
 		hlen = IP6M_MINLEN;
 		if (ndo->ndo_vflag) {
 			ND_TCHECK_4(bp + hlen + 4);
 			ND_PRINT(" %s Init Cookie=%08x:%08x",
 			       type == IP6M_HOME_TEST ? "Home" : "Care-of",
 			       EXTRACT_BE_U_4(bp + hlen),
 			       EXTRACT_BE_U_4(bp + hlen + 4));
 		}
 		hlen += 8;
 		if (ndo->ndo_vflag) {
 			ND_TCHECK_4(bp + hlen + 4);
 			ND_PRINT(" %s Keygen Token=%08x:%08x",
 			       type == IP6M_HOME_TEST ? "Home" : "Care-of",
 			       EXTRACT_BE_U_4(bp + hlen),
 			       EXTRACT_BE_U_4(bp + hlen + 4));
 		}
 		hlen += 8;
 		break;
 	case IP6M_BINDING_UPDATE:
 		ND_TCHECK_2(mh->ip6m_data16[0]);
 		ND_PRINT(" seq#=%u", EXTRACT_BE_U_2(mh->ip6m_data16[0]));
 		hlen = IP6M_MINLEN;
 		ND_TCHECK_2(bp + hlen);
 		if (EXTRACT_U_1(bp + hlen) & 0xf0) {
 			ND_PRINT(" ");
 			if (EXTRACT_U_1(bp + hlen) & 0x80)
 				ND_PRINT("A");
 			if (EXTRACT_U_1(bp + hlen) & 0x40)
 				ND_PRINT("H");
 			if (EXTRACT_U_1(bp + hlen) & 0x20)
 				ND_PRINT("L");
 			if (EXTRACT_U_1(bp + hlen) & 0x10)
 				ND_PRINT("K");
 		}
 		/* Reserved (4bits) */
 		hlen += 1;
 		/* Reserved (8bits) */
 		hlen += 1;
 		ND_TCHECK_2(bp + hlen);
 		/* units of 4 secs */
 		ND_PRINT(" lifetime=%u", EXTRACT_BE_U_2(bp + hlen) << 2);
 		hlen += 2;
 		break;
 	case IP6M_BINDING_ACK:
 		ND_TCHECK_1(mh->ip6m_data8[0]);
 		ND_PRINT(" status=%u", EXTRACT_U_1(mh->ip6m_data8[0]));
 		ND_TCHECK_1(mh->ip6m_data8[1]);
 		if (EXTRACT_U_1(mh->ip6m_data8[1]) & 0x80)
 			ND_PRINT(" K");
 		/* Reserved (7bits) */
 		hlen = IP6M_MINLEN;
 		ND_TCHECK_2(bp + hlen);
 		ND_PRINT(" seq#=%u", EXTRACT_BE_U_2(bp + hlen));
 		hlen += 2;
 		ND_TCHECK_2(bp + hlen);
 		/* units of 4 secs */
 		ND_PRINT(" lifetime=%u", EXTRACT_BE_U_2(bp + hlen) << 2);
 		hlen += 2;
 		break;
 	case IP6M_BINDING_ERROR:
 		ND_TCHECK_1(mh->ip6m_data8[0]);
 		ND_PRINT(" status=%u", EXTRACT_U_1(mh->ip6m_data8[0]));
 		/* Reserved */
 		hlen = IP6M_MINLEN;
 		ND_TCHECK_16(bp + hlen);
 		ND_PRINT(" homeaddr %s", ip6addr_string(ndo, bp + hlen));
 		hlen += 16;
 		break;
 	default:
 		ND_PRINT(" len=%u", EXTRACT_U_1(mh->ip6m_len));
 		return(mhlen);
 		break;
 	}
 	if (ndo->ndo_vflag)
 		if (mobility_opt_print(ndo, bp + hlen, mhlen - hlen))
 			goto trunc;

 	return(mhlen);

  trunc:
 	nd_print_trunc(ndo);
 	return(-1);
 }
	/*
	* 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.
	*/

	/* \summary: IPv6 mobility printer */
	/* RFC 3775 */

	#ifdef HAVE_CONFIG_H
	#include <config.h>
	#endif

	#include "netdissect-stdinc.h"

	#include "netdissect.h"
	#include "addrtoname.h"
	#include "extract.h"

	#include "ip6.h"


	/* Mobility header */
	struct ip6_mobility {
	nd_uint8_t ip6m_pproto; /* following payload protocol (for PG) */
	nd_uint8_t ip6m_len; /* length in units of 8 octets */
	nd_uint8_t ip6m_type; /* message type */
	nd_uint8_t reserved; /* reserved */
	nd_uint16_t ip6m_cksum; /* sum of IPv6 pseudo-header and MH */
	union {
	nd_uint16_t ip6m_un_data16[1]; /* type-specific field */
	nd_uint8_t ip6m_un_data8[2]; /* type-specific field */
	} ip6m_dataun;
	};

	#define ip6m_data16 ip6m_dataun.ip6m_un_data16
	#define ip6m_data8 ip6m_dataun.ip6m_un_data8

	#define IP6M_MINLEN 8

	/* http://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */

	/* 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 */
	#define IP6M_MAX 7

	static const struct tok ip6m_str[] = {
	{ IP6M_BINDING_REQUEST, "BRR" },
	{ IP6M_HOME_TEST_INIT, "HoTI" },
	{ IP6M_CAREOF_TEST_INIT, "CoTI" },
	{ IP6M_HOME_TEST, "HoT" },
	{ IP6M_CAREOF_TEST, "CoT" },
	{ IP6M_BINDING_UPDATE, "BU" },
	{ IP6M_BINDING_ACK, "BA" },
	{ IP6M_BINDING_ERROR, "BE" },
	{ 0, NULL }
	};

	static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = {
	IP6M_MINLEN, /* IP6M_BINDING_REQUEST */
	IP6M_MINLEN + 8, /* IP6M_HOME_TEST_INIT */
	IP6M_MINLEN + 8, /* IP6M_CAREOF_TEST_INIT */
	IP6M_MINLEN + 16, /* IP6M_HOME_TEST */
	IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST */
	IP6M_MINLEN + 4, /* IP6M_BINDING_UPDATE */
	IP6M_MINLEN + 4, /* IP6M_BINDING_ACK */
	IP6M_MINLEN + 16, /* IP6M_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 int
	mobility_opt_print(netdissect_options *ndo,
	const u_char *bp, const unsigned len)
	{
	unsigned i, optlen;

	for (i = 0; i < len; i += optlen) {
	ND_TCHECK_1(bp + i);
	if (EXTRACT_U_1(bp + i) == IP6MOPT_PAD1)
	optlen = 1;
	else {
	if (i + 1 < len) {
	ND_TCHECK_1(bp + i + 1);
	optlen = EXTRACT_U_1(bp + i + 1) + 2;
	}
	else
	goto trunc;
	}
	if (i + optlen > len)
	goto trunc;
	ND_TCHECK_1(bp + i + optlen);

	switch (EXTRACT_U_1(bp + i)) {
	case IP6MOPT_PAD1:
	ND_PRINT("(pad1)");
	break;
	case IP6MOPT_PADN:
	if (len - i < IP6MOPT_MINLEN) {
	ND_PRINT("(padn: trunc)");
	goto trunc;
	}
	ND_PRINT("(padn)");
	break;
	case IP6MOPT_REFRESH:
	if (len - i < IP6MOPT_REFRESH_MINLEN) {
	ND_PRINT("(refresh: trunc)");
	goto trunc;
	}
	/* units of 4 secs */
	ND_TCHECK_2(bp + i + 2);
	ND_PRINT("(refresh: %u)",
	EXTRACT_BE_U_2(bp + i + 2) << 2);
	break;
	case IP6MOPT_ALTCOA:
	if (len - i < IP6MOPT_ALTCOA_MINLEN) {
	ND_PRINT("(altcoa: trunc)");
	goto trunc;
	}
	ND_TCHECK_16(bp + i + 2);
	ND_PRINT("(alt-CoA: %s)", ip6addr_string(ndo, bp + i + 2));
	break;
	case IP6MOPT_NONCEID:
	if (len - i < IP6MOPT_NONCEID_MINLEN) {
	ND_PRINT("(ni: trunc)");
	goto trunc;
	}
	ND_TCHECK_2(bp + i + 2);
	ND_TCHECK_2(bp + i + 4);
	ND_PRINT("(ni: ho=0x%04x co=0x%04x)",
	EXTRACT_BE_U_2(bp + i + 2),
	EXTRACT_BE_U_2(bp + i + 4));
	break;
	case IP6MOPT_AUTH:
	if (len - i < IP6MOPT_AUTH_MINLEN) {
	ND_PRINT("(auth: trunc)");
	goto trunc;
	}
	ND_PRINT("(auth)");
	break;
	default:
	if (len - i < IP6MOPT_MINLEN) {
	ND_PRINT("(sopt_type %u: trunc)", EXTRACT_U_1(bp + i));
	goto trunc;
	}
	ND_PRINT("(type-0x%02x: len=%u)", EXTRACT_U_1(bp + i), EXTRACT_U_1(bp + i + 1));
	break;
	}
	}
	return 0;

	trunc:
	return 1;
	}

	/*
	* Mobility Header
	*/
	int
	mobility_print(netdissect_options *ndo,
	const u_char bp, const u_char bp2 _U_)
	{
	const struct ip6_mobility *mh;
	const u_char *ep;
	unsigned mhlen, hlen;
	uint8_t type;

	ndo->ndo_protocol = "mobility";
	mh = (const struct ip6_mobility *)bp;

	/* 'ep' points to the end of available data. */
	ep = ndo->ndo_snapend;

	if (!ND_TTEST_1(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 = (EXTRACT_U_1(mh->ip6m_len) + 1) << 3;

	/* XXX ip6m_cksum */

	ND_TCHECK_1(mh->ip6m_type);
	type = EXTRACT_U_1(mh->ip6m_type);
	if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) {
	ND_PRINT("(header length %u is too small for type %u)", mhlen, type);
	goto trunc;
	}
	ND_PRINT("mobility: %s", tok2str(ip6m_str, "type-#%u", type));
	switch (type) {
	case IP6M_BINDING_REQUEST:
	hlen = IP6M_MINLEN;
	break;
	case IP6M_HOME_TEST_INIT:
	case IP6M_CAREOF_TEST_INIT:
	hlen = IP6M_MINLEN;
	if (ndo->ndo_vflag) {
	ND_TCHECK_4(bp + hlen + 4);
	ND_PRINT(" %s Init Cookie=%08x:%08x",
	type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
	EXTRACT_BE_U_4(bp + hlen),
	EXTRACT_BE_U_4(bp + hlen + 4));
	}
	hlen += 8;
	break;
	case IP6M_HOME_TEST:
	case IP6M_CAREOF_TEST:
	ND_TCHECK_2(mh->ip6m_data16[0]);
	ND_PRINT(" nonce id=0x%x", EXTRACT_BE_U_2(mh->ip6m_data16[0]));
	hlen = IP6M_MINLEN;
	if (ndo->ndo_vflag) {
	ND_TCHECK_4(bp + hlen + 4);
	ND_PRINT(" %s Init Cookie=%08x:%08x",
	type == IP6M_HOME_TEST ? "Home" : "Care-of",
	EXTRACT_BE_U_4(bp + hlen),
	EXTRACT_BE_U_4(bp + hlen + 4));
	}
	hlen += 8;
	if (ndo->ndo_vflag) {
	ND_TCHECK_4(bp + hlen + 4);
	ND_PRINT(" %s Keygen Token=%08x:%08x",
	type == IP6M_HOME_TEST ? "Home" : "Care-of",
	EXTRACT_BE_U_4(bp + hlen),
	EXTRACT_BE_U_4(bp + hlen + 4));
	}
	hlen += 8;
	break;
	case IP6M_BINDING_UPDATE:
	ND_TCHECK_2(mh->ip6m_data16[0]);
	ND_PRINT(" seq#=%u", EXTRACT_BE_U_2(mh->ip6m_data16[0]));
	hlen = IP6M_MINLEN;
	ND_TCHECK_2(bp + hlen);
	if (EXTRACT_U_1(bp + hlen) & 0xf0) {
	ND_PRINT(" ");
	if (EXTRACT_U_1(bp + hlen) & 0x80)
	ND_PRINT("A");
	if (EXTRACT_U_1(bp + hlen) & 0x40)
	ND_PRINT("H");
	if (EXTRACT_U_1(bp + hlen) & 0x20)
	ND_PRINT("L");
	if (EXTRACT_U_1(bp + hlen) & 0x10)
	ND_PRINT("K");
	}
	/* Reserved (4bits) */
	hlen += 1;
	/* Reserved (8bits) */
	hlen += 1;
	ND_TCHECK_2(bp + hlen);
	/* units of 4 secs */
	ND_PRINT(" lifetime=%u", EXTRACT_BE_U_2(bp + hlen) << 2);
	hlen += 2;
	break;
	case IP6M_BINDING_ACK:
	ND_TCHECK_1(mh->ip6m_data8[0]);
	ND_PRINT(" status=%u", EXTRACT_U_1(mh->ip6m_data8[0]));
	ND_TCHECK_1(mh->ip6m_data8[1]);
	if (EXTRACT_U_1(mh->ip6m_data8[1]) & 0x80)
	ND_PRINT(" K");
	/* Reserved (7bits) */
	hlen = IP6M_MINLEN;
	ND_TCHECK_2(bp + hlen);
	ND_PRINT(" seq#=%u", EXTRACT_BE_U_2(bp + hlen));
	hlen += 2;
	ND_TCHECK_2(bp + hlen);
	/* units of 4 secs */
	ND_PRINT(" lifetime=%u", EXTRACT_BE_U_2(bp + hlen) << 2);
	hlen += 2;
	break;
	case IP6M_BINDING_ERROR:
	ND_TCHECK_1(mh->ip6m_data8[0]);
	ND_PRINT(" status=%u", EXTRACT_U_1(mh->ip6m_data8[0]));
	/* Reserved */
	hlen = IP6M_MINLEN;
	ND_TCHECK_16(bp + hlen);
	ND_PRINT(" homeaddr %s", ip6addr_string(ndo, bp + hlen));
	hlen += 16;
	break;
	default:
	ND_PRINT(" len=%u", EXTRACT_U_1(mh->ip6m_len));
	return(mhlen);
	break;
	}
	if (ndo->ndo_vflag)
	if (mobility_opt_print(ndo, bp + hlen, mhlen - hlen))
	goto trunc;

	return(mhlen);

	trunc:
	nd_print_trunc(ndo);
	return(-1);
	}