ICMPv6: Avoid reinventing ND_TCHECK_*() macros

[tcpdump] / print-icmp6.c

/*
 * Copyright (c) 1988, 1989, 1990, 1991, 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.
 */

/* \summary: IPv6 Internet Control Message Protocol (ICMPv6) printer */

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

#include "netdissect-stdinc.h"

#include <stdio.h>
#include <string.h>

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

#include "ip6.h"
#include "ipproto.h"

#include "udp.h"
#include "ah.h"

/*      NetBSD: icmp6.h,v 1.13 2000/08/03 16:30:37 itojun Exp   */
/*      $KAME: icmp6.h,v 1.22 2000/08/03 15:25:16 jinmei Exp $  */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 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.
 */

struct icmp6_hdr {
        nd_uint8_t      icmp6_type;     /* type field */
        nd_uint8_t      icmp6_code;     /* code field */
        nd_uint16_t     icmp6_cksum;    /* checksum field */
        union {
                nd_uint32_t     icmp6_un_data32[1]; /* type-specific field */
                nd_uint16_t     icmp6_un_data16[2]; /* type-specific field */
                nd_uint8_t      icmp6_un_data8[4];  /* type-specific field */
                nd_byte         icmp6_un_data[1];   /* type-specific field */
        } icmp6_dataun;
};

#define icmp6_data32    icmp6_dataun.icmp6_un_data32
#define icmp6_data16    icmp6_dataun.icmp6_un_data16
#define icmp6_data8     icmp6_dataun.icmp6_un_data8
#define icmp6_data      icmp6_dataun.icmp6_un_data
#define icmp6_pptr      icmp6_data32[0]         /* parameter prob */
#define icmp6_mtu       icmp6_data32[0]         /* packet too big */
#define icmp6_id        icmp6_data16[0]         /* echo request/reply */
#define icmp6_seq       icmp6_data16[1]         /* echo request/reply */
#define icmp6_maxdelay  icmp6_data16[0]         /* mcast group membership */

#define ICMP6_DST_UNREACH               1       /* dest unreachable, codes: */
#define ICMP6_PACKET_TOO_BIG            2       /* packet too big */
#define ICMP6_TIME_EXCEEDED             3       /* time exceeded, code: */
#define ICMP6_PARAM_PROB                4       /* ip6 header bad */

#define ICMP6_ECHO_REQUEST              128     /* echo service */
#define ICMP6_ECHO_REPLY                129     /* echo reply */
#define ICMP6_MEMBERSHIP_QUERY          130     /* group membership query */
#define MLD6_LISTENER_QUERY             130     /* multicast listener query */
#define ICMP6_MEMBERSHIP_REPORT         131     /* group membership report */
#define MLD6_LISTENER_REPORT            131     /* multicast listener report */
#define ICMP6_MEMBERSHIP_REDUCTION      132     /* group membership termination */
#define MLD6_LISTENER_DONE              132     /* multicast listener done */

#define ND_ROUTER_SOLICIT               133     /* router solicitation */
#define ND_ROUTER_ADVERT                134     /* router advertisement */
#define ND_NEIGHBOR_SOLICIT             135     /* neighbor solicitation */
#define ND_NEIGHBOR_ADVERT              136     /* neighbor advertisement */
#define ND_REDIRECT                     137     /* redirect */

#define ICMP6_ROUTER_RENUMBERING        138     /* router renumbering */

#define ICMP6_WRUREQUEST                139     /* who are you request */
#define ICMP6_WRUREPLY                  140     /* who are you reply */
#define ICMP6_FQDN_QUERY                139     /* FQDN query */
#define ICMP6_FQDN_REPLY                140     /* FQDN reply */
#define ICMP6_NI_QUERY                  139     /* node information request - RFC 4620 */
#define ICMP6_NI_REPLY                  140     /* node information reply - RFC 4620 */
#define IND_SOLICIT                     141     /* inverse neighbor solicitation */
#define IND_ADVERT                      142     /* inverse neighbor advertisement */

#define ICMP6_V2_MEMBERSHIP_REPORT      143     /* v2 membership report */
#define MLDV2_LISTENER_REPORT           143     /* v2 multicast listener report */
#define ICMP6_HADISCOV_REQUEST          144
#define ICMP6_HADISCOV_REPLY            145
#define ICMP6_MOBILEPREFIX_SOLICIT      146
#define ICMP6_MOBILEPREFIX_ADVERT       147

#define MLD6_MTRACE_RESP                200     /* mtrace response(to sender) */
#define MLD6_MTRACE                     201     /* mtrace messages */

#define ICMP6_MAXTYPE                   201

#define ICMP6_DST_UNREACH_NOROUTE       0       /* no route to destination */
#define ICMP6_DST_UNREACH_ADMIN         1       /* administratively prohibited */
#define ICMP6_DST_UNREACH_NOTNEIGHBOR   2       /* not a neighbor(obsolete) */
#define ICMP6_DST_UNREACH_BEYONDSCOPE   2       /* beyond scope of source address */
#define ICMP6_DST_UNREACH_ADDR          3       /* address unreachable */
#define ICMP6_DST_UNREACH_NOPORT        4       /* port unreachable */

#define ICMP6_TIME_EXCEED_TRANSIT       0       /* ttl==0 in transit */
#define ICMP6_TIME_EXCEED_REASSEMBLY    1       /* ttl==0 in reass */

#define ICMP6_PARAMPROB_HEADER          0       /* erroneous header field */
#define ICMP6_PARAMPROB_NEXTHEADER      1       /* unrecognized next header */
#define ICMP6_PARAMPROB_OPTION          2       /* unrecognized option */

#define ICMP6_INFOMSG_MASK              0x80    /* all informational messages */

#define ICMP6_NI_SUBJ_IPV6      0       /* Query Subject is an IPv6 address */
#define ICMP6_NI_SUBJ_FQDN      1       /* Query Subject is a Domain name */
#define ICMP6_NI_SUBJ_IPV4      2       /* Query Subject is an IPv4 address */

#define ICMP6_NI_SUCCESS        0       /* node information successful reply */
#define ICMP6_NI_REFUSED        1       /* node information request is refused */
#define ICMP6_NI_UNKNOWN        2       /* unknown Qtype */

#define ICMP6_ROUTER_RENUMBERING_COMMAND  0     /* rr command */
#define ICMP6_ROUTER_RENUMBERING_RESULT   1     /* rr result */
#define ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET   255     /* rr seq num reset */

/* Used in kernel only */
#define ND_REDIRECT_ONLINK      0       /* redirect to an on-link node */
#define ND_REDIRECT_ROUTER      1       /* redirect to a better router */

/*
 * Multicast Listener Discovery
 */
struct mld6_hdr {
        struct icmp6_hdr        mld6_hdr;
        nd_ipv6                 mld6_addr; /* multicast address */
};

#define mld6_type       mld6_hdr.icmp6_type
#define mld6_code       mld6_hdr.icmp6_code
#define mld6_cksum      mld6_hdr.icmp6_cksum
#define mld6_maxdelay   mld6_hdr.icmp6_data16[0]
#define mld6_reserved   mld6_hdr.icmp6_data16[1]

#define MLD_MINLEN      24
#define MLDV2_MINLEN    28

/*
 * Neighbor Discovery
 */

struct nd_router_solicit {      /* router solicitation */
        struct icmp6_hdr        nd_rs_hdr;
        /* could be followed by options */
};

#define nd_rs_type      nd_rs_hdr.icmp6_type
#define nd_rs_code      nd_rs_hdr.icmp6_code
#define nd_rs_cksum     nd_rs_hdr.icmp6_cksum
#define nd_rs_reserved  nd_rs_hdr.icmp6_data32[0]

struct nd_router_advert {       /* router advertisement */
        struct icmp6_hdr        nd_ra_hdr;
        nd_uint32_t             nd_ra_reachable;        /* reachable time */
        nd_uint32_t             nd_ra_retransmit;       /* retransmit timer */
        /* could be followed by options */
};

#define nd_ra_type              nd_ra_hdr.icmp6_type
#define nd_ra_code              nd_ra_hdr.icmp6_code
#define nd_ra_cksum             nd_ra_hdr.icmp6_cksum
#define nd_ra_curhoplimit       nd_ra_hdr.icmp6_data8[0]
#define nd_ra_flags_reserved    nd_ra_hdr.icmp6_data8[1]
#define ND_RA_FLAG_MANAGED      0x80
#define ND_RA_FLAG_OTHER        0x40
#define ND_RA_FLAG_HOME_AGENT   0x20

/*
 * Router preference values based on draft-draves-ipngwg-router-selection-01.
 * These are non-standard definitions.
 */
#define ND_RA_FLAG_RTPREF_MASK  0x18 /* 00011000 */

#define ND_RA_FLAG_RTPREF_HIGH  0x08 /* 00001000 */
#define ND_RA_FLAG_RTPREF_MEDIUM        0x00 /* 00000000 */
#define ND_RA_FLAG_RTPREF_LOW   0x18 /* 00011000 */
#define ND_RA_FLAG_RTPREF_RSV   0x10 /* 00010000 */

#define nd_ra_router_lifetime   nd_ra_hdr.icmp6_data16[1]

struct nd_neighbor_solicit {    /* neighbor solicitation */
        struct icmp6_hdr        nd_ns_hdr;
        nd_ipv6                 nd_ns_target;   /*target address */
        /* could be followed by options */
};

#define nd_ns_type              nd_ns_hdr.icmp6_type
#define nd_ns_code              nd_ns_hdr.icmp6_code
#define nd_ns_cksum             nd_ns_hdr.icmp6_cksum
#define nd_ns_reserved          nd_ns_hdr.icmp6_data32[0]

struct nd_neighbor_advert {     /* neighbor advertisement */
        struct icmp6_hdr        nd_na_hdr;
        nd_ipv6                 nd_na_target;   /* target address */
        /* could be followed by options */
};

#define nd_na_type              nd_na_hdr.icmp6_type
#define nd_na_code              nd_na_hdr.icmp6_code
#define nd_na_cksum             nd_na_hdr.icmp6_cksum
#define nd_na_flags_reserved    nd_na_hdr.icmp6_data32[0]

#define ND_NA_FLAG_ROUTER               0x80000000
#define ND_NA_FLAG_SOLICITED            0x40000000
#define ND_NA_FLAG_OVERRIDE             0x20000000

struct nd_redirect {            /* redirect */
        struct icmp6_hdr        nd_rd_hdr;
        nd_ipv6                 nd_rd_target;   /* target address */
        nd_ipv6                 nd_rd_dst;      /* destination address */
        /* could be followed by options */
};

#define nd_rd_type              nd_rd_hdr.icmp6_type
#define nd_rd_code              nd_rd_hdr.icmp6_code
#define nd_rd_cksum             nd_rd_hdr.icmp6_cksum
#define nd_rd_reserved          nd_rd_hdr.icmp6_data32[0]

struct nd_opt_hdr {             /* Neighbor discovery option header */
        nd_uint8_t      nd_opt_type;
        nd_uint8_t      nd_opt_len;
        /* followed by option specific data*/
};

#define ND_OPT_SOURCE_LINKADDR          1
#define ND_OPT_TARGET_LINKADDR          2
#define ND_OPT_PREFIX_INFORMATION       3
#define ND_OPT_REDIRECTED_HEADER        4
#define ND_OPT_MTU                      5
#define ND_OPT_ADVINTERVAL              7
#define ND_OPT_HOMEAGENT_INFO           8
#define ND_OPT_ROUTE_INFO               24      /* RFC4191 */
#define ND_OPT_RDNSS                    25
#define ND_OPT_DNSSL                    31

struct nd_opt_prefix_info {     /* prefix information */
        nd_uint8_t      nd_opt_pi_type;
        nd_uint8_t      nd_opt_pi_len;
        nd_uint8_t      nd_opt_pi_prefix_len;
        nd_uint8_t      nd_opt_pi_flags_reserved;
        nd_uint32_t     nd_opt_pi_valid_time;
        nd_uint32_t     nd_opt_pi_preferred_time;
        nd_uint32_t     nd_opt_pi_reserved2;
        nd_ipv6         nd_opt_pi_prefix;
};

#define ND_OPT_PI_FLAG_ONLINK           0x80
#define ND_OPT_PI_FLAG_AUTO             0x40
#define ND_OPT_PI_FLAG_ROUTER           0x20    /*2292bis*/

struct nd_opt_rd_hdr {         /* redirected header */
        nd_uint8_t      nd_opt_rh_type;
        nd_uint8_t      nd_opt_rh_len;
        nd_uint16_t     nd_opt_rh_reserved1;
        nd_uint32_t     nd_opt_rh_reserved2;
        /* followed by IP header and data */
};

struct nd_opt_mtu {             /* MTU option */
        nd_uint8_t      nd_opt_mtu_type;
        nd_uint8_t      nd_opt_mtu_len;
        nd_uint16_t     nd_opt_mtu_reserved;
        nd_uint32_t     nd_opt_mtu_mtu;
};

struct nd_opt_rdnss {           /* RDNSS RFC 6106 5.1 */
        nd_uint8_t      nd_opt_rdnss_type;
        nd_uint8_t      nd_opt_rdnss_len;
        nd_uint16_t     nd_opt_rdnss_reserved;
        nd_uint32_t     nd_opt_rdnss_lifetime;
        nd_ipv6         nd_opt_rdnss_addr[1];   /* variable-length */
};

struct nd_opt_dnssl {           /* DNSSL RFC 6106 5.2 */
        nd_uint8_t  nd_opt_dnssl_type;
        nd_uint8_t  nd_opt_dnssl_len;
        nd_uint16_t nd_opt_dnssl_reserved;
        nd_uint32_t nd_opt_dnssl_lifetime;
        /* followed by list of DNS search domains, variable-length */
};

struct nd_opt_advinterval {     /* Advertisement interval option */
        nd_uint8_t      nd_opt_adv_type;
        nd_uint8_t      nd_opt_adv_len;
        nd_uint16_t     nd_opt_adv_reserved;
        nd_uint32_t     nd_opt_adv_interval;
};

struct nd_opt_homeagent_info {  /* Home Agent info */
        nd_uint8_t      nd_opt_hai_type;
        nd_uint8_t      nd_opt_hai_len;
        nd_uint16_t     nd_opt_hai_reserved;
        nd_uint16_t     nd_opt_hai_preference;
        nd_uint16_t     nd_opt_hai_lifetime;
};

struct nd_opt_route_info {      /* route info */
        nd_uint8_t      nd_opt_rti_type;
        nd_uint8_t      nd_opt_rti_len;
        nd_uint8_t      nd_opt_rti_prefixlen;
        nd_uint8_t      nd_opt_rti_flags;
        nd_uint32_t     nd_opt_rti_lifetime;
        /* prefix follows */
};

/*
 * icmp6 namelookup
 */

struct icmp6_namelookup {
        struct icmp6_hdr        icmp6_nl_hdr;
        nd_byte                 icmp6_nl_nonce[8];
        nd_int32_t              icmp6_nl_ttl;
#if 0
        nd_uint8_t              icmp6_nl_len;
        nd_byte                 icmp6_nl_name[3];
#endif
        /* could be followed by options */
};

/*
 * icmp6 node information
 */
struct icmp6_nodeinfo {
        struct icmp6_hdr icmp6_ni_hdr;
        nd_byte icmp6_ni_nonce[8];
        /* could be followed by reply data */
};

#define ni_type         icmp6_ni_hdr.icmp6_type
#define ni_code         icmp6_ni_hdr.icmp6_code
#define ni_cksum        icmp6_ni_hdr.icmp6_cksum
#define ni_qtype        icmp6_ni_hdr.icmp6_data16[0]
#define ni_flags        icmp6_ni_hdr.icmp6_data16[1]

#define NI_QTYPE_NOOP           0 /* NOOP  */
#define NI_QTYPE_SUPTYPES       1 /* Supported Qtypes (drafts up to 09) */
#define NI_QTYPE_FQDN           2 /* FQDN (draft 04) */
#define NI_QTYPE_DNSNAME        2 /* DNS Name */
#define NI_QTYPE_NODEADDR       3 /* Node Addresses */
#define NI_QTYPE_IPV4ADDR       4 /* IPv4 Addresses */

/* network endian */
#define NI_SUPTYPE_FLAG_COMPRESS        ((uint16_t)htons(0x1))
#define NI_FQDN_FLAG_VALIDTTL           ((uint16_t)htons(0x1))

/* network endian */
#define NI_NODEADDR_FLAG_TRUNCATE       ((uint16_t)htons(0x1))
#define NI_NODEADDR_FLAG_ALL            ((uint16_t)htons(0x2))
#define NI_NODEADDR_FLAG_COMPAT         ((uint16_t)htons(0x4))
#define NI_NODEADDR_FLAG_LINKLOCAL      ((uint16_t)htons(0x8))
#define NI_NODEADDR_FLAG_SITELOCAL      ((uint16_t)htons(0x10))
#define NI_NODEADDR_FLAG_GLOBAL         ((uint16_t)htons(0x20))
#define NI_NODEADDR_FLAG_ANYCAST        ((uint16_t)htons(0x40)) /* just experimental. not in spec */

struct ni_reply_fqdn {
        nd_uint32_t ni_fqdn_ttl;        /* TTL */
        nd_uint8_t ni_fqdn_namelen; /* length in octets of the FQDN */
        nd_byte ni_fqdn_name[3]; /* XXX: alignment */
};

/*
 * Router Renumbering. as router-renum-08.txt
 */
struct icmp6_router_renum {     /* router renumbering header */
        struct icmp6_hdr        rr_hdr;
        nd_uint8_t              rr_segnum;
        nd_uint8_t              rr_flags;
        nd_uint16_t             rr_maxdelay;
        nd_uint32_t             rr_reserved;
};
#define ICMP6_RR_FLAGS_TEST             0x80
#define ICMP6_RR_FLAGS_REQRESULT        0x40
#define ICMP6_RR_FLAGS_FORCEAPPLY       0x20
#define ICMP6_RR_FLAGS_SPECSITE         0x10
#define ICMP6_RR_FLAGS_PREVDONE         0x08

#define rr_type         rr_hdr.icmp6_type
#define rr_code         rr_hdr.icmp6_code
#define rr_cksum        rr_hdr.icmp6_cksum
#define rr_seqnum       rr_hdr.icmp6_data32[0]

struct rr_pco_match {           /* match prefix part */
        nd_uint8_t              rpm_code;
        nd_uint8_t              rpm_len;
        nd_uint8_t              rpm_ordinal;
        nd_uint8_t              rpm_matchlen;
        nd_uint8_t              rpm_minlen;
        nd_uint8_t              rpm_maxlen;
        nd_uint16_t             rpm_reserved;
        nd_ipv6                 rpm_prefix;
};

#define RPM_PCO_ADD             1
#define RPM_PCO_CHANGE          2
#define RPM_PCO_SETGLOBAL       3
#define RPM_PCO_MAX             4

struct rr_pco_use {             /* use prefix part */
        nd_uint8_t      rpu_uselen;
        nd_uint8_t      rpu_keeplen;
        nd_uint8_t      rpu_ramask;
        nd_uint8_t      rpu_raflags;
        nd_uint32_t     rpu_vltime;
        nd_uint32_t     rpu_pltime;
        nd_uint32_t     rpu_flags;
        nd_ipv6         rpu_prefix;
};
#define ICMP6_RR_PCOUSE_RAFLAGS_ONLINK  0x80
#define ICMP6_RR_PCOUSE_RAFLAGS_AUTO    0x40

/* network endian */
#define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME     ((uint32_t)htonl(0x80000000))
#define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME     ((uint32_t)htonl(0x40000000))

struct rr_result {              /* router renumbering result message */
        nd_uint16_t     rrr_flags;
        nd_uint8_t      rrr_ordinal;
        nd_uint8_t      rrr_matchedlen;
        nd_uint32_t     rrr_ifid;
        nd_ipv6         rrr_prefix;
};
/* network endian */
#define ICMP6_RR_RESULT_FLAGS_OOB               ((uint16_t)htons(0x0002))
#define ICMP6_RR_RESULT_FLAGS_FORBIDDEN         ((uint16_t)htons(0x0001))

static const char *get_rtpref(u_int);
static const char *get_lifetime(uint32_t);
static void print_lladdr(netdissect_options *ndo, const u_char *, size_t);
static void icmp6_opt_print(netdissect_options *ndo, const u_char *, int);
static void mld6_print(netdissect_options *ndo, const u_char *);
static void mldv2_report_print(netdissect_options *ndo, const u_char *, u_int);
static void mldv2_query_print(netdissect_options *ndo, const u_char *, u_int);
static const struct udphdr *get_upperlayer(netdissect_options *ndo, const u_char *, u_int *);
static void dnsname_print(netdissect_options *ndo, const u_char *, const u_char *);
static void icmp6_nodeinfo_print(netdissect_options *ndo, u_int, const u_char *, const u_char *);
static void icmp6_rrenum_print(netdissect_options *ndo, const u_char *, const u_char *);

#ifndef abs
#define abs(a)  ((0 < (a)) ? (a) : -(a))
#endif

/*
 * DIO: Updated to RFC6550, as published in 2012: section 6. (page 30)
 */

#define ND_RPL_MESSAGE 155  /* 0x9B */

enum ND_RPL_CODE {
    ND_RPL_DAG_IS=0x00,
    ND_RPL_DAG_IO=0x01,
    ND_RPL_DAO   =0x02,
    ND_RPL_DAO_ACK=0x03,
    ND_RPL_SEC_DAG_IS = 0x80,
    ND_RPL_SEC_DAG_IO = 0x81,
    ND_RPL_SEC_DAG    = 0x82,
    ND_RPL_SEC_DAG_ACK= 0x83,
    ND_RPL_SEC_CONSIST= 0x8A
};

enum ND_RPL_DIO_FLAGS {
        ND_RPL_DIO_GROUNDED = 0x80,
        ND_RPL_DIO_DATRIG   = 0x40,
        ND_RPL_DIO_DASUPPORT= 0x20,
        ND_RPL_DIO_RES4     = 0x10,
        ND_RPL_DIO_RES3     = 0x08,
        ND_RPL_DIO_PRF_MASK = 0x07  /* 3-bit preference */
};

#define DAGID_LEN 16

/* section 6 of draft-ietf-roll-rpl-19 */
struct nd_rpl_security {
    nd_uint8_t  rpl_sec_t_reserved;     /* bit 7 is T-bit */
    nd_uint8_t  rpl_sec_algo;
    nd_uint16_t rpl_sec_kim_lvl_flags;  /* bit 15/14, KIM */
                                      /* bit 10-8, LVL, bit 7-0 flags */
    nd_uint32_t rpl_sec_counter;
#if 0
    nd_byte     rpl_sec_ki[0];          /* depends upon kim */
#endif
};

/* section 6.2.1, DODAG Information Solication (DIS_IS) */
struct nd_rpl_dis_is {
    nd_uint8_t rpl_dis_flags;
    nd_uint8_t rpl_dis_reserved;
#if 0
    nd_byte    rpl_dis_options[0];
#endif
};

/* section 6.3.1, DODAG Information Object (DIO) */
struct nd_rpl_dio {
    nd_uint8_t  rpl_instanceid;
    nd_uint8_t  rpl_version;
    nd_uint16_t rpl_dagrank;
    nd_uint8_t  rpl_mopprf;   /* bit 7=G, 5-3=MOP, 2-0=PRF */
    nd_uint8_t  rpl_dtsn;     /* Dest. Advertisement Trigger Sequence Number */
    nd_uint8_t  rpl_flags;    /* no flags defined yet */
    nd_uint8_t  rpl_resv1;
    nd_byte     rpl_dagid[DAGID_LEN];
};
#define RPL_DIO_GROUND_FLAG 0x80
#define RPL_DIO_MOP_SHIFT   3
#define RPL_DIO_MOP_MASK    (7 << RPL_DIO_MOP_SHIFT)
#define RPL_DIO_PRF_SHIFT   0
#define RPL_DIO_PRF_MASK    (7 << RPL_DIO_PRF_SHIFT)
#define RPL_DIO_GROUNDED(X) ((X)&RPL_DIO_GROUND_FLAG)
#define RPL_DIO_MOP(X)      (enum RPL_DIO_MOP)(((X)&RPL_DIO_MOP_MASK) >> RPL_DIO_MOP_SHIFT)
#define RPL_DIO_PRF(X)      (((X)&RPL_DIO_PRF_MASK) >> RPL_DIO_PRF_SHIFT)

enum RPL_DIO_MOP {
    RPL_DIO_NONSTORING= 0x0,
    RPL_DIO_STORING   = 0x1,
    RPL_DIO_NONSTORING_MULTICAST = 0x2,
    RPL_DIO_STORING_MULTICAST    = 0x3
};

enum RPL_SUBOPT {
        RPL_OPT_PAD1        = 0,
        RPL_OPT_PADN        = 1,
        RPL_DIO_METRICS     = 2,
        RPL_DIO_ROUTINGINFO = 3,
        RPL_DIO_CONFIG      = 4,
        RPL_DAO_RPLTARGET   = 5,
        RPL_DAO_TRANSITINFO = 6,
        RPL_DIO_DESTPREFIX  = 8,
        RPL_DAO_RPLTARGET_DESC=9
};

struct rpl_genoption {
    nd_uint8_t rpl_dio_type;
    nd_uint8_t rpl_dio_len;        /* suboption length, not including type/len */
};
#define RPL_GENOPTION_LEN       2

#define RPL_DIO_LIFETIME_INFINITE   0xffffffff
#define RPL_DIO_LIFETIME_DISCONNECT 0

struct rpl_dio_destprefix {
    nd_uint8_t rpl_dio_type;
    nd_uint8_t rpl_dio_len;
    nd_uint8_t rpl_dio_prefixlen;        /* in bits */
    nd_uint8_t rpl_dio_prf;              /* flags, including Route Preference */
    nd_uint32_t rpl_dio_prefixlifetime;  /* in seconds */
#if 0
    nd_byte     rpl_dio_prefix[0];       /* variable number of bytes */
#endif
};

/* section 6.4.1, DODAG Information Object (DIO) */
struct nd_rpl_dao {
    nd_uint8_t  rpl_instanceid;
    nd_uint8_t  rpl_flags;      /* bit 7=K, 6=D */
    nd_uint8_t  rpl_resv;
    nd_uint8_t  rpl_daoseq;
    nd_byte     rpl_dagid[DAGID_LEN];   /* present when D set. */
};
#define ND_RPL_DAO_MIN_LEN      4       /* length without DAGID */

/* indicates if this DAO is to be acK'ed */
#define RPL_DAO_K_SHIFT   7
#define RPL_DAO_K_MASK    (1 << RPL_DAO_K_SHIFT)
#define RPL_DAO_K(X)      (((X)&RPL_DAO_K_MASK) >> RPL_DAO_K_SHIFT)

/* indicates if the DAGID is present */
#define RPL_DAO_D_SHIFT   6
#define RPL_DAO_D_MASK    (1 << RPL_DAO_D_SHIFT)
#define RPL_DAO_D(X)      (((X)&RPL_DAO_D_MASK) >> RPL_DAO_D_SHIFT)

struct rpl_dao_target {
    nd_uint8_t rpl_dao_type;
    nd_uint8_t rpl_dao_len;
    nd_uint8_t rpl_dao_flags;            /* unused */
    nd_uint8_t rpl_dao_prefixlen;        /* in bits */
#if 0
    nd_byte    rpl_dao_prefix[0];        /* variable number of bytes */
#endif
};

/* section 6.5.1, Destination Advertisement Object Acknowledgement (DAO-ACK) */
struct nd_rpl_daoack {
    nd_uint8_t  rpl_instanceid;
    nd_uint8_t  rpl_flags;      /* bit 7=D */
    nd_uint8_t  rpl_daoseq;
    nd_uint8_t  rpl_status;
    nd_byte     rpl_dagid[DAGID_LEN];   /* present when D set. */
};
#define ND_RPL_DAOACK_MIN_LEN   4       /* length without DAGID */
/* indicates if the DAGID is present */
#define RPL_DAOACK_D_SHIFT   7
#define RPL_DAOACK_D_MASK    (1 << RPL_DAOACK_D_SHIFT)
#define RPL_DAOACK_D(X)      (((X)&RPL_DAOACK_D_MASK) >> RPL_DAOACK_D_SHIFT)

static const struct tok icmp6_type_values[] = {
    { ICMP6_DST_UNREACH, "destination unreachable"},
    { ICMP6_PACKET_TOO_BIG, "packet too big"},
    { ICMP6_TIME_EXCEEDED, "time exceeded in-transit"},
    { ICMP6_PARAM_PROB, "parameter problem"},
    { ICMP6_ECHO_REQUEST, "echo request"},
    { ICMP6_ECHO_REPLY, "echo reply"},
    { MLD6_LISTENER_QUERY, "multicast listener query"},
    { MLD6_LISTENER_REPORT, "multicast listener report"},
    { MLD6_LISTENER_DONE, "multicast listener done"},
    { ND_ROUTER_SOLICIT, "router solicitation"},
    { ND_ROUTER_ADVERT, "router advertisement"},
    { ND_NEIGHBOR_SOLICIT, "neighbor solicitation"},
    { ND_NEIGHBOR_ADVERT, "neighbor advertisement"},
    { ND_REDIRECT, "redirect"},
    { ICMP6_ROUTER_RENUMBERING, "router renumbering"},
    { IND_SOLICIT, "inverse neighbor solicitation"},
    { IND_ADVERT, "inverse neighbor advertisement"},
    { MLDV2_LISTENER_REPORT, "multicast listener report v2"},
    { ICMP6_HADISCOV_REQUEST, "ha discovery request"},
    { ICMP6_HADISCOV_REPLY, "ha discovery reply"},
    { ICMP6_MOBILEPREFIX_SOLICIT, "mobile router solicitation"},
    { ICMP6_MOBILEPREFIX_ADVERT, "mobile router advertisement"},
    { ICMP6_WRUREQUEST, "who-are-you request"},
    { ICMP6_WRUREPLY, "who-are-you reply"},
    { ICMP6_NI_QUERY, "node information query"},
    { ICMP6_NI_REPLY, "node information reply"},
    { MLD6_MTRACE, "mtrace message"},
    { MLD6_MTRACE_RESP, "mtrace response"},
    { ND_RPL_MESSAGE,   "RPL"},
    { 0,        NULL }
};

static const struct tok icmp6_dst_unreach_code_values[] = {
    { ICMP6_DST_UNREACH_NOROUTE, "unreachable route" },
    { ICMP6_DST_UNREACH_ADMIN, " unreachable prohibited"},
    { ICMP6_DST_UNREACH_BEYONDSCOPE, "beyond scope"},
    { ICMP6_DST_UNREACH_ADDR, "unreachable address"},
    { ICMP6_DST_UNREACH_NOPORT, "unreachable port"},
    { 0,        NULL }
};

static const struct tok icmp6_opt_pi_flag_values[] = {
    { ND_OPT_PI_FLAG_ONLINK, "onlink" },
    { ND_OPT_PI_FLAG_AUTO, "auto" },
    { ND_OPT_PI_FLAG_ROUTER, "router" },
    { 0,        NULL }
};

static const struct tok icmp6_opt_ra_flag_values[] = {
    { ND_RA_FLAG_MANAGED, "managed" },
    { ND_RA_FLAG_OTHER, "other stateful"},
    { ND_RA_FLAG_HOME_AGENT, "home agent"},
    { 0,        NULL }
};

static const struct tok icmp6_nd_na_flag_values[] = {
    { ND_NA_FLAG_ROUTER, "router" },
    { ND_NA_FLAG_SOLICITED, "solicited" },
    { ND_NA_FLAG_OVERRIDE, "override" },
    { 0,        NULL }
};


static const struct tok icmp6_opt_values[] = {
   { ND_OPT_SOURCE_LINKADDR, "source link-address"},
   { ND_OPT_TARGET_LINKADDR, "destination link-address"},
   { ND_OPT_PREFIX_INFORMATION, "prefix info"},
   { ND_OPT_REDIRECTED_HEADER, "redirected header"},
   { ND_OPT_MTU, "mtu"},
   { ND_OPT_RDNSS, "rdnss"},
   { ND_OPT_DNSSL, "dnssl"},
   { ND_OPT_ADVINTERVAL, "advertisement interval"},
   { ND_OPT_HOMEAGENT_INFO, "homeagent information"},
   { ND_OPT_ROUTE_INFO, "route info"},
   { 0, NULL }
};

/* mldv2 report types */
static const struct tok mldv2report2str[] = {
        { 1,    "is_in" },
        { 2,    "is_ex" },
        { 3,    "to_in" },
        { 4,    "to_ex" },
        { 5,    "allow" },
        { 6,    "block" },
        { 0,    NULL }
};

static const char *
get_rtpref(u_int v)
{
        static const char *rtpref_str[] = {
                "medium",               /* 00 */
                "high",                 /* 01 */
                "rsv",                  /* 10 */
                "low"                   /* 11 */
        };

        return rtpref_str[((v & ND_RA_FLAG_RTPREF_MASK) >> 3) & 0xff];
}

static const char *
get_lifetime(uint32_t v)
{
        static char buf[20];

        if (v == (uint32_t)~0UL)
                return "infinity";
        else {
                nd_snprintf(buf, sizeof(buf), "%us", v);
                return buf;
        }
}

static void
print_lladdr(netdissect_options *ndo, const uint8_t *p, size_t l)
{
        const uint8_t *ep, *q;

        q = p;
        ep = p + l;
        while (l > 0 && q < ep) {
                if (q > p)
                        ND_PRINT(":");
                ND_PRINT("%02x", EXTRACT_U_1(q));
                q++;
                l--;
        }
}

static int icmp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
        const struct icmp6_hdr *icp, u_int len)
{
        return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)icp, len, len,
                                IPPROTO_ICMPV6);
}

static const struct tok rpl_mop_values[] = {
        { RPL_DIO_NONSTORING,         "nonstoring"},
        { RPL_DIO_STORING,            "storing"},
        { RPL_DIO_NONSTORING_MULTICAST, "nonstoring-multicast"},
        { RPL_DIO_STORING_MULTICAST,  "storing-multicast"},
        { 0, NULL},
};

static const struct tok rpl_subopt_values[] = {
        { RPL_OPT_PAD1, "pad1"},
        { RPL_OPT_PADN, "padN"},
        { RPL_DIO_METRICS, "metrics"},
        { RPL_DIO_ROUTINGINFO, "routinginfo"},
        { RPL_DIO_CONFIG,    "config"},
        { RPL_DAO_RPLTARGET, "rpltarget"},
        { RPL_DAO_TRANSITINFO, "transitinfo"},
        { RPL_DIO_DESTPREFIX, "destprefix"},
        { RPL_DAO_RPLTARGET_DESC, "rpltargetdesc"},
        { 0, NULL},
};

static void
rpl_printopts(netdissect_options *ndo, const uint8_t *opts, u_int length)
{
        const struct rpl_genoption *opt;
        uint8_t dio_type;
        u_int optlen;

        while (length != 0) {
                opt = (const struct rpl_genoption *)opts;
                ND_TCHECK_1(opt->rpl_dio_type);
                dio_type = EXTRACT_U_1(opt->rpl_dio_type);
                if (dio_type == RPL_OPT_PAD1) {
                        optlen = 1;
                        ND_PRINT(" opt:pad1");
                } else {
                        if (length < RPL_GENOPTION_LEN)
                                goto trunc;
                        optlen = EXTRACT_U_1(opt->rpl_dio_len)+RPL_GENOPTION_LEN;
                        ND_PRINT(" opt:%s len:%u ",
                                  tok2str(rpl_subopt_values, "subopt:%u", dio_type),
                                  optlen);
                        ND_TCHECK_LEN(opt, optlen);
                        if (length < optlen)
                                goto trunc;
                        if (ndo->ndo_vflag > 2) {
                                hex_print(ndo,
                                          " ",
                                          opts + RPL_GENOPTION_LEN,  /* content of DIO option */
                                          optlen - RPL_GENOPTION_LEN);
                        }
                }
                opts += optlen;
                length -= optlen;
        }
        return;
trunc:
        ND_PRINT(" [|truncated]");
        return;
}

static void
rpl_dio_print(netdissect_options *ndo,
              const u_char *bp, u_int length)
{
        const struct nd_rpl_dio *dio = (const struct nd_rpl_dio *)bp;
        const char *dagid_str;

        ND_TCHECK_SIZE(dio);
        dagid_str = ip6addr_string (ndo, dio->rpl_dagid);

        ND_PRINT(" [dagid:%s,seq:%u,instance:%u,rank:%u,%smop:%s,prf:%u]",
                  dagid_str,
                  EXTRACT_U_1(dio->rpl_dtsn),
                  EXTRACT_U_1(dio->rpl_instanceid),
                  EXTRACT_BE_U_2(dio->rpl_dagrank),
                  RPL_DIO_GROUNDED(EXTRACT_U_1(dio->rpl_mopprf)) ? "grounded,":"",
                  tok2str(rpl_mop_values, "mop%u", RPL_DIO_MOP(EXTRACT_U_1(dio->rpl_mopprf))),
                  RPL_DIO_PRF(EXTRACT_U_1(dio->rpl_mopprf)));

        if(ndo->ndo_vflag > 1) {
                rpl_printopts(ndo, bp + sizeof(struct nd_rpl_dio),
                              length - sizeof(struct nd_rpl_dio));
        }
        return;
trunc:
        ND_PRINT(" [|truncated]");
        return;
}

static void
rpl_dao_print(netdissect_options *ndo,
              const u_char *bp, u_int length)
{
        const struct nd_rpl_dao *dao = (const struct nd_rpl_dao *)bp;
        const char *dagid_str = "<elided>";
        uint8_t rpl_flags;

        ND_TCHECK_SIZE(dao);
        if (length < ND_RPL_DAO_MIN_LEN)
                goto tooshort;

        bp += ND_RPL_DAO_MIN_LEN;
        length -= ND_RPL_DAO_MIN_LEN;
        rpl_flags = EXTRACT_U_1(dao->rpl_flags);
        if(RPL_DAO_D(rpl_flags)) {
                ND_TCHECK_LEN(dao->rpl_dagid, DAGID_LEN);
                if (length < DAGID_LEN)
                        goto tooshort;
                dagid_str = ip6addr_string (ndo, dao->rpl_dagid);
                bp += DAGID_LEN;
                length -= DAGID_LEN;
        }

        ND_PRINT(" [dagid:%s,seq:%u,instance:%u%s%s,%02x]",
                  dagid_str,
                  EXTRACT_U_1(dao->rpl_daoseq),
                  EXTRACT_U_1(dao->rpl_instanceid),
                  RPL_DAO_K(rpl_flags) ? ",acK":"",
                  RPL_DAO_D(rpl_flags) ? ",Dagid":"",
                  rpl_flags);

        if(ndo->ndo_vflag > 1) {
                rpl_printopts(ndo, bp, length);
        }
        return;

trunc:
        ND_PRINT(" [|truncated]");
        return;

tooshort:
        ND_PRINT(" [|length too short]");
        return;
}

static void
rpl_daoack_print(netdissect_options *ndo,
                 const u_char *bp, u_int length)
{
        const struct nd_rpl_daoack *daoack = (const struct nd_rpl_daoack *)bp;
        const char *dagid_str = "<elided>";

        ND_TCHECK_LEN(daoack, ND_RPL_DAOACK_MIN_LEN);
        if (length < ND_RPL_DAOACK_MIN_LEN)
                goto tooshort;

        bp += ND_RPL_DAOACK_MIN_LEN;
        length -= ND_RPL_DAOACK_MIN_LEN;
        if(RPL_DAOACK_D(EXTRACT_U_1(daoack->rpl_flags))) {
                ND_TCHECK_LEN(daoack->rpl_dagid, DAGID_LEN);
                if (length < DAGID_LEN)
                        goto tooshort;
                dagid_str = ip6addr_string (ndo, daoack->rpl_dagid);
                bp += DAGID_LEN;
                length -= DAGID_LEN;
        }

        ND_PRINT(" [dagid:%s,seq:%u,instance:%u,status:%u]",
                  dagid_str,
                  EXTRACT_U_1(daoack->rpl_daoseq),
                  EXTRACT_U_1(daoack->rpl_instanceid),
                  EXTRACT_U_1(daoack->rpl_status));

        /* no officially defined options for DAOACK, but print any we find */
        if(ndo->ndo_vflag > 1) {
                rpl_printopts(ndo, bp, length);
        }
        return;

trunc:
        ND_PRINT(" [|dao-truncated]");
        return;

tooshort:
        ND_PRINT(" [|dao-length too short]");
        return;
}

static void
rpl_print(netdissect_options *ndo,
          uint8_t icmp6_code,
          const u_char *bp, u_int length)
{
        int secured = icmp6_code & 0x80;
        int basecode= icmp6_code & 0x7f;

        if(secured) {
                ND_PRINT(", (SEC) [worktodo]");
                /* XXX
                 * the next header pointer needs to move forward to
                 * skip the secure part.
                 */
                return;
        } else {
                ND_PRINT(", (CLR)");
        }

        switch(basecode) {
        case ND_RPL_DAG_IS:
                ND_PRINT("DODAG Information Solicitation");
                if(ndo->ndo_vflag) {
                }
                break;
        case ND_RPL_DAG_IO:
                ND_PRINT("DODAG Information Object");
                if(ndo->ndo_vflag) {
                        rpl_dio_print(ndo, bp, length);
                }
                break;
        case ND_RPL_DAO:
                ND_PRINT("Destination Advertisement Object");
                if(ndo->ndo_vflag) {
                        rpl_dao_print(ndo, bp, length);
                }
                break;
        case ND_RPL_DAO_ACK:
                ND_PRINT("Destination Advertisement Object Ack");
                if(ndo->ndo_vflag) {
                        rpl_daoack_print(ndo, bp, length);
                }
                break;
        default:
                ND_PRINT("RPL message, unknown code %u",icmp6_code);
                break;
        }
        return;

#if 0
trunc:
        ND_PRINT(" [|truncated]");
        return;
#endif

}


void
icmp6_print(netdissect_options *ndo,
            const u_char *bp, u_int length, const u_char *bp2, int fragmented)
{
        const struct icmp6_hdr *dp;
        uint8_t icmp6_type, icmp6_code;
        const struct ip6_hdr *ip;
        const struct ip6_hdr *oip;
        const struct udphdr *ouh;
        u_int dport;
        const u_char *ep;
        u_int prot;

        ndo->ndo_protocol = "icmp6";
        dp = (const struct icmp6_hdr *)bp;
        ip = (const struct ip6_hdr *)bp2;
        oip = (const struct ip6_hdr *)(dp + 1);
        /* 'ep' points to the end of available data. */
        ep = ndo->ndo_snapend;

        if (ndo->ndo_vflag && !fragmented) {
                uint16_t sum, udp_sum;

                if (ND_TTEST_LEN(bp, length)) {
                        ND_TCHECK_2(dp->icmp6_cksum);
                        udp_sum = EXTRACT_BE_U_2(dp->icmp6_cksum);
                        sum = icmp6_cksum(ndo, ip, dp, length);
                        if (sum != 0)
                                ND_PRINT("[bad icmp6 cksum 0x%04x -> 0x%04x!] ",
                                                udp_sum,
                                                in_cksum_shouldbe(udp_sum, sum));
                        else
                                ND_PRINT("[icmp6 sum ok] ");
                }
        }

        ND_TCHECK_1(dp->icmp6_type);
        icmp6_type = EXTRACT_U_1(dp->icmp6_type);
        ND_PRINT("ICMP6, %s", tok2str(icmp6_type_values,"unknown icmp6 type (%u)",icmp6_type));

        /* display cosmetics: print the packet length for printer that use the vflag now */
        if (ndo->ndo_vflag && (icmp6_type == ND_ROUTER_SOLICIT ||
                      icmp6_type == ND_ROUTER_ADVERT ||
                      icmp6_type == ND_NEIGHBOR_ADVERT ||
                      icmp6_type == ND_NEIGHBOR_SOLICIT ||
                      icmp6_type == ND_REDIRECT ||
                      icmp6_type == ICMP6_HADISCOV_REPLY ||
                      icmp6_type == ICMP6_MOBILEPREFIX_ADVERT ))
                ND_PRINT(", length %u", length);

        ND_TCHECK_1(dp->icmp6_code);
        icmp6_code = EXTRACT_U_1(dp->icmp6_code);

        switch (icmp6_type) {
        case ICMP6_DST_UNREACH:
                ND_TCHECK_16(oip->ip6_dst);
                ND_PRINT(", %s", tok2str(icmp6_dst_unreach_code_values,"unknown unreach code (%u)",icmp6_code));
                switch (icmp6_code) {

                case ICMP6_DST_UNREACH_NOROUTE: /* fall through */
                case ICMP6_DST_UNREACH_ADMIN:
                case ICMP6_DST_UNREACH_ADDR:
                        ND_PRINT(" %s",ip6addr_string(ndo, oip->ip6_dst));
                        break;
                case ICMP6_DST_UNREACH_BEYONDSCOPE:
                        ND_PRINT(" %s, source address %s",
                               ip6addr_string(ndo, oip->ip6_dst),
                                  ip6addr_string(ndo, oip->ip6_src));
                        break;
                case ICMP6_DST_UNREACH_NOPORT:
                        if ((ouh = get_upperlayer(ndo, (const u_char *)oip, &prot))
                            == NULL)
                                goto trunc;

                        dport = EXTRACT_BE_U_2(ouh->uh_dport);
                        switch (prot) {
                        case IPPROTO_TCP:
                                ND_PRINT(", %s tcp port %s",
                                        ip6addr_string(ndo, oip->ip6_dst),
                                          tcpport_string(ndo, dport));
                                break;
                        case IPPROTO_UDP:
                                ND_PRINT(", %s udp port %s",
                                        ip6addr_string(ndo, oip->ip6_dst),
                                          udpport_string(ndo, dport));
                                break;
                        default:
                                ND_PRINT(", %s protocol %u port %u unreachable",
                                        ip6addr_string(ndo, oip->ip6_dst),
                                          prot, dport);
                                break;
                        }
                        break;
                default:
                  if (ndo->ndo_vflag <= 1) {
                    print_unknown_data(ndo, bp,"\n\t",length);
                    return;
                  }
                    break;
                }
                break;
        case ICMP6_PACKET_TOO_BIG:
                ND_TCHECK_4(dp->icmp6_mtu);
                ND_PRINT(", mtu %u", EXTRACT_BE_U_4(dp->icmp6_mtu));
                break;
        case ICMP6_TIME_EXCEEDED:
                ND_TCHECK_16(oip->ip6_dst);
                switch (icmp6_code) {
                case ICMP6_TIME_EXCEED_TRANSIT:
                        ND_PRINT(" for %s",
                                  ip6addr_string(ndo, oip->ip6_dst));
                        break;
                case ICMP6_TIME_EXCEED_REASSEMBLY:
                        ND_PRINT(" (reassembly)");
                        break;
                default:
                        ND_PRINT(", unknown code (%u)", icmp6_code);
                        break;
                }
                break;
        case ICMP6_PARAM_PROB:
                ND_TCHECK_16(oip->ip6_dst);
                switch (icmp6_code) {
                case ICMP6_PARAMPROB_HEADER:
                        ND_PRINT(", erroneous - octet %u", EXTRACT_BE_U_4(dp->icmp6_pptr));
                        break;
                case ICMP6_PARAMPROB_NEXTHEADER:
                        ND_PRINT(", next header - octet %u", EXTRACT_BE_U_4(dp->icmp6_pptr));
                        break;
                case ICMP6_PARAMPROB_OPTION:
                        ND_PRINT(", option - octet %u", EXTRACT_BE_U_4(dp->icmp6_pptr));
                        break;
                default:
                        ND_PRINT(", code-#%u",
                                  icmp6_code);
                        break;
                }
                break;
        case ICMP6_ECHO_REQUEST:
        case ICMP6_ECHO_REPLY:
                ND_TCHECK_2(dp->icmp6_seq);
                ND_PRINT(", seq %u", EXTRACT_BE_U_2(dp->icmp6_seq));
                break;
        case ICMP6_MEMBERSHIP_QUERY:
                if (length == MLD_MINLEN) {
                        mld6_print(ndo, (const u_char *)dp);
                } else if (length >= MLDV2_MINLEN) {
                        ND_PRINT(" v2");
                        mldv2_query_print(ndo, (const u_char *)dp, length);
                } else {
                        ND_PRINT(" unknown-version (len %u) ", length);
                }
                break;
        case ICMP6_MEMBERSHIP_REPORT:
                mld6_print(ndo, (const u_char *)dp);
                break;
        case ICMP6_MEMBERSHIP_REDUCTION:
                mld6_print(ndo, (const u_char *)dp);
                break;
        case ND_ROUTER_SOLICIT:
#define RTSOLLEN 8
                if (ndo->ndo_vflag) {
                        icmp6_opt_print(ndo, (const u_char *)dp + RTSOLLEN,
                                        length - RTSOLLEN);
                }
                break;
        case ND_ROUTER_ADVERT:
#define RTADVLEN 16
                if (ndo->ndo_vflag) {
                        const struct nd_router_advert *p;

                        p = (const struct nd_router_advert *)dp;
                        ND_TCHECK_4(p->nd_ra_retransmit);
                        ND_PRINT("\n\thop limit %u, Flags [%s]"
                                  ", pref %s, router lifetime %us, reachable time %us, retrans time %us",
                                  EXTRACT_U_1(p->nd_ra_curhoplimit),
                                  bittok2str(icmp6_opt_ra_flag_values,"none",EXTRACT_U_1(p->nd_ra_flags_reserved)),
                                  get_rtpref(EXTRACT_U_1(p->nd_ra_flags_reserved)),
                                  EXTRACT_BE_U_2(p->nd_ra_router_lifetime),
                                  EXTRACT_BE_U_4(p->nd_ra_reachable),
                                  EXTRACT_BE_U_4(p->nd_ra_retransmit));

                        icmp6_opt_print(ndo, (const u_char *)dp + RTADVLEN,
                                        length - RTADVLEN);
                }
                break;
        case ND_NEIGHBOR_SOLICIT:
            {
                const struct nd_neighbor_solicit *p;
                p = (const struct nd_neighbor_solicit *)dp;
                ND_TCHECK_16(p->nd_ns_target);
                ND_PRINT(", who has %s", ip6addr_string(ndo, p->nd_ns_target));
                if (ndo->ndo_vflag) {
#define NDSOLLEN 24
                        icmp6_opt_print(ndo, (const u_char *)dp + NDSOLLEN,
                                        length - NDSOLLEN);
                }
            }
                break;
        case ND_NEIGHBOR_ADVERT:
            {
                const struct nd_neighbor_advert *p;

                p = (const struct nd_neighbor_advert *)dp;
                ND_TCHECK_16(p->nd_na_target);
                ND_PRINT(", tgt is %s",
                          ip6addr_string(ndo, p->nd_na_target));
                if (ndo->ndo_vflag) {
                        ND_PRINT(", Flags [%s]",
                                  bittok2str(icmp6_nd_na_flag_values,
                                             "none",
                                             EXTRACT_BE_U_4(p->nd_na_flags_reserved)));
#define NDADVLEN 24
                        icmp6_opt_print(ndo, (const u_char *)dp + NDADVLEN,
                                        length - NDADVLEN);
#undef NDADVLEN
                }
            }
                break;
        case ND_REDIRECT:
            {
                const struct nd_redirect *p;

                p = (const struct nd_redirect *)dp;
                ND_TCHECK_16(p->nd_rd_dst);
                ND_PRINT(", %s", ip6addr_string(ndo, p->nd_rd_dst));
                ND_TCHECK_16(p->nd_rd_target);
                ND_PRINT(" to %s", ip6addr_string(ndo, p->nd_rd_target));
#define REDIRECTLEN 40
                if (ndo->ndo_vflag) {
                        icmp6_opt_print(ndo, (const u_char *)dp + REDIRECTLEN,
                                        length - REDIRECTLEN);
#undef REDIRECTLEN
                }
            }
                break;
        case ICMP6_ROUTER_RENUMBERING:
                icmp6_rrenum_print(ndo, bp, ep);
                break;
        case ICMP6_NI_QUERY:
        case ICMP6_NI_REPLY:
                icmp6_nodeinfo_print(ndo, length, bp, ep);
                break;
        case IND_SOLICIT:
        case IND_ADVERT:
                break;
        case ICMP6_V2_MEMBERSHIP_REPORT:
                mldv2_report_print(ndo, (const u_char *) dp, length);
                break;
        case ICMP6_MOBILEPREFIX_SOLICIT: /* fall through */
        case ICMP6_HADISCOV_REQUEST:
                ND_TCHECK_2(dp->icmp6_data16[0]);
                ND_PRINT(", id 0x%04x", EXTRACT_BE_U_2(dp->icmp6_data16[0]));
                break;
        case ICMP6_HADISCOV_REPLY:
                if (ndo->ndo_vflag) {
                        const u_char *cp;
                        const u_char *p;

                        ND_TCHECK_2(dp->icmp6_data16[0]);
                        ND_PRINT(", id 0x%04x", EXTRACT_BE_U_2(dp->icmp6_data16[0]));
                        cp = (const u_char *)dp + length;
                        p = (const u_char *)(dp + 1);
                        while (p < cp) {
                                ND_TCHECK_16(p);
                                ND_PRINT(", %s", ip6addr_string(ndo, p));
                                p += 16;
                        }
                }
                break;
        case ICMP6_MOBILEPREFIX_ADVERT:
                if (ndo->ndo_vflag) {
                        uint16_t flags;

                        ND_TCHECK_2(dp->icmp6_data16[0]);
                        ND_PRINT(", id 0x%04x", EXTRACT_BE_U_2(dp->icmp6_data16[0]));
                        ND_TCHECK_2(dp->icmp6_data16[1]);
                        flags = EXTRACT_BE_U_2(dp->icmp6_data16[1]);
                        if (flags & 0xc000)
                                ND_PRINT(" ");
                        if (flags & 0x8000)
                                ND_PRINT("M");
                        if (flags & 0x4000)
                                ND_PRINT("O");
#define MPADVLEN 8
                        icmp6_opt_print(ndo, (const u_char *)dp + MPADVLEN,
                                        length - MPADVLEN);
                }
                break;
        case ND_RPL_MESSAGE:
                /* plus 4, because struct icmp6_hdr contains 4 bytes of icmp payload */
                rpl_print(ndo, icmp6_code, dp->icmp6_data, length-sizeof(struct icmp6_hdr)+4);
                break;
        default:
                ND_PRINT(", length %u", length);
                if (ndo->ndo_vflag <= 1)
                        print_unknown_data(ndo, bp,"\n\t", length);
                return;
        }
        if (!ndo->ndo_vflag)
                ND_PRINT(", length %u", length);
        return;
trunc:
        ND_PRINT("[|icmp6]");
}

static const struct udphdr *
get_upperlayer(netdissect_options *ndo, const u_char *bp, u_int *prot)
{
        const u_char *ep;
        const struct ip6_hdr *ip6 = (const struct ip6_hdr *)bp;
        const struct udphdr *uh;
        const struct ip6_hbh *hbh;
        const struct ip6_frag *fragh;
        const struct ah *ah;
        u_int nh;
        int hlen;

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

        if (!ND_TTEST_1(ip6->ip6_nxt))
                return NULL;

        nh = EXTRACT_U_1(ip6->ip6_nxt);
        hlen = sizeof(struct ip6_hdr);

        while (bp < ep) {
                bp += hlen;

                switch(nh) {
                case IPPROTO_UDP:
                case IPPROTO_TCP:
                        uh = (const struct udphdr *)bp;
                        if (ND_TTEST_2(uh->uh_dport)) {
                                *prot = nh;
                                return(uh);
                        }
                        else
                                return(NULL);
                        /* NOTREACHED */

                case IPPROTO_HOPOPTS:
                case IPPROTO_DSTOPTS:
                case IPPROTO_ROUTING:
                        hbh = (const struct ip6_hbh *)bp;
                        if (!ND_TTEST_1(hbh->ip6h_len))
                                return(NULL);
                        nh = EXTRACT_U_1(hbh->ip6h_nxt);
                        hlen = (EXTRACT_U_1(hbh->ip6h_len) + 1) << 3;
                        break;

                case IPPROTO_FRAGMENT: /* this should be odd, but try anyway */
                        fragh = (const struct ip6_frag *)bp;
                        if (!ND_TTEST_2(fragh->ip6f_offlg))
                                return(NULL);
                        /* fragments with non-zero offset are meaningless */
                        if ((EXTRACT_BE_U_2(fragh->ip6f_offlg) & IP6F_OFF_MASK) != 0)
                                return(NULL);
                        nh = EXTRACT_U_1(fragh->ip6f_nxt);
                        hlen = sizeof(struct ip6_frag);
                        break;

                case IPPROTO_AH:
                        ah = (const struct ah *)bp;
                        if (!ND_TTEST_1(ah->ah_len))
                                return(NULL);
                        nh = EXTRACT_U_1(ah->ah_nxt);
                        hlen = (EXTRACT_U_1(ah->ah_len) + 2) << 2;
                        break;

                default:        /* unknown or undecodable header */
                        *prot = nh; /* meaningless, but set here anyway */
                        return(NULL);
                }
        }

        return(NULL);           /* should be notreached, though */
}

static void
icmp6_opt_print(netdissect_options *ndo, const u_char *bp, int resid)
{
        const struct nd_opt_hdr *op;
        uint8_t opt_type, opt_len;
        const struct nd_opt_prefix_info *opp;
        const struct nd_opt_mtu *opm;
        const struct nd_opt_rdnss *oprd;
        const struct nd_opt_dnssl *opds;
        const struct nd_opt_advinterval *opa;
        const struct nd_opt_homeagent_info *oph;
        const struct nd_opt_route_info *opri;
        const u_char *cp, *ep, *domp;
        struct in6_addr in6;
        size_t l;
        u_int i;

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

        while (cp < ep) {
                op = (const struct nd_opt_hdr *)cp;

                ND_TCHECK_1(op->nd_opt_len);
                if (resid <= 0)
                        return;
                opt_type = EXTRACT_U_1(op->nd_opt_type);
                opt_len = EXTRACT_U_1(op->nd_opt_len);
                if (opt_len == 0)
                        goto trunc;
                if (cp + (opt_len << 3) > ep)
                        goto trunc;

                ND_PRINT("\n\t  %s option (%u), length %u (%u): ",
                          tok2str(icmp6_opt_values, "unknown", opt_type),
                          opt_type,
                          opt_len << 3,
                          opt_len);

                switch (opt_type) {
                case ND_OPT_SOURCE_LINKADDR:
                        l = (opt_len << 3) - 2;
                        print_lladdr(ndo, cp + 2, l);
                        break;
                case ND_OPT_TARGET_LINKADDR:
                        l = (opt_len << 3) - 2;
                        print_lladdr(ndo, cp + 2, l);
                        break;
                case ND_OPT_PREFIX_INFORMATION:
                        opp = (const struct nd_opt_prefix_info *)op;
                        ND_TCHECK_16(opp->nd_opt_pi_prefix);
                        ND_PRINT("%s/%u%s, Flags [%s], valid time %s",
                                  ip6addr_string(ndo, opp->nd_opt_pi_prefix),
                                  EXTRACT_U_1(opp->nd_opt_pi_prefix_len),
                                  (opt_len != 4) ? "badlen" : "",
                                  bittok2str(icmp6_opt_pi_flag_values, "none", EXTRACT_U_1(opp->nd_opt_pi_flags_reserved)),
                                  get_lifetime(EXTRACT_BE_U_4(opp->nd_opt_pi_valid_time)));
                        ND_PRINT(", pref. time %s", get_lifetime(EXTRACT_BE_U_4(opp->nd_opt_pi_preferred_time)));
                        break;
                case ND_OPT_REDIRECTED_HEADER:
                        print_unknown_data(ndo, bp,"\n\t    ",opt_len<<3);
                        /* xxx */
                        break;
                case ND_OPT_MTU:
                        opm = (const struct nd_opt_mtu *)op;
                        ND_TCHECK_4(opm->nd_opt_mtu_mtu);
                        ND_PRINT(" %u%s",
                               EXTRACT_BE_U_4(opm->nd_opt_mtu_mtu),
                               (opt_len != 1) ? "bad option length" : "" );
                        break;
                case ND_OPT_RDNSS:
                        oprd = (const struct nd_opt_rdnss *)op;
                        l = (opt_len - 1) / 2;
                        ND_PRINT(" lifetime %us,",
                                  EXTRACT_BE_U_4(oprd->nd_opt_rdnss_lifetime));
                        for (i = 0; i < l; i++) {
                                ND_TCHECK_16(oprd->nd_opt_rdnss_addr[i]);
                                ND_PRINT(" addr: %s",
                                          ip6addr_string(ndo, oprd->nd_opt_rdnss_addr[i]));
                        }
                        break;
                case ND_OPT_DNSSL:
                        opds = (const struct nd_opt_dnssl *)op;
                        ND_PRINT(" lifetime %us, domain(s):",
                                  EXTRACT_BE_U_4(opds->nd_opt_dnssl_lifetime));
                        domp = cp + 8; /* domain names, variable-sized, RFC1035-encoded */
                        while (domp < cp + (opt_len << 3) && EXTRACT_U_1(domp) != '\0')
                        {
                                ND_PRINT(" ");
                                if ((domp = ns_nprint(ndo, domp, bp)) == NULL)
                                        goto trunc;
                        }
                        break;
                case ND_OPT_ADVINTERVAL:
                        opa = (const struct nd_opt_advinterval *)op;
                        ND_TCHECK_4(opa->nd_opt_adv_interval);
                        ND_PRINT(" %ums", EXTRACT_BE_U_4(opa->nd_opt_adv_interval));
                        break;
                case ND_OPT_HOMEAGENT_INFO:
                        oph = (const struct nd_opt_homeagent_info *)op;
                        ND_TCHECK_2(oph->nd_opt_hai_lifetime);
                        ND_PRINT(" preference %u, lifetime %u",
                                  EXTRACT_BE_U_2(oph->nd_opt_hai_preference),
                                  EXTRACT_BE_U_2(oph->nd_opt_hai_lifetime));
                        break;
                case ND_OPT_ROUTE_INFO:
                        opri = (const struct nd_opt_route_info *)op;
                        ND_TCHECK_4(opri->nd_opt_rti_lifetime);
                        memset(&in6, 0, sizeof(in6));
                        switch (opt_len) {
                        case 1:
                                break;
                        case 2:
                                ND_TCHECK_8(opri + 1);
                                memcpy(&in6, opri + 1, 8);
                                break;
                        case 3:
                                ND_TCHECK_16(opri + 1);
                                memcpy(&in6, opri + 1, 16);
                                break;
                        default:
                                goto trunc;
                        }
                        ND_PRINT(" %s/%u", ip6addr_string(ndo, (const u_char *)&in6),
                                  EXTRACT_U_1(opri->nd_opt_rti_prefixlen));
                        ND_PRINT(", pref=%s", get_rtpref(EXTRACT_U_1(opri->nd_opt_rti_flags)));
                        ND_PRINT(", lifetime=%s",
                                  get_lifetime(EXTRACT_BE_U_4(opri->nd_opt_rti_lifetime)));
                        break;
                default:
                        if (ndo->ndo_vflag <= 1) {
                                print_unknown_data(ndo,cp+2,"\n\t  ", (opt_len << 3) - 2); /* skip option header */
                            return;
                        }
                        break;
                }
                /* do we want to see an additional hexdump ? */
                if (ndo->ndo_vflag> 1)
                        print_unknown_data(ndo, cp+2,"\n\t    ", (opt_len << 3) - 2); /* skip option header */

                cp += opt_len << 3;
                resid -= opt_len << 3;
        }
        return;

 trunc:
        ND_PRINT("[ndp opt]");
        return;
}

static void
mld6_print(netdissect_options *ndo, const u_char *bp)
{
        const struct mld6_hdr *mp = (const struct mld6_hdr *)bp;
        const u_char *ep;

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

        if ((const u_char *)mp + sizeof(*mp) > ep)
                return;

        ND_PRINT("max resp delay: %u ", EXTRACT_BE_U_2(mp->mld6_maxdelay));
        ND_PRINT("addr: %s", ip6addr_string(ndo, mp->mld6_addr));
}

static void
mldv2_report_print(netdissect_options *ndo, const u_char *bp, u_int len)
{
    const struct icmp6_hdr *icp = (const struct icmp6_hdr *) bp;
    u_int group, nsrcs, ngroups;
    u_int i, j;

    /* Minimum len is 8 */
    if (len < 8) {
            ND_PRINT(" [invalid len %u]", len);
            return;
    }

    ND_TCHECK_2(icp->icmp6_data16[1]);
    ngroups = EXTRACT_BE_U_2(icp->icmp6_data16[1]);
    ND_PRINT(", %u group record(s)", ngroups);
    if (ndo->ndo_vflag > 0) {
        /* Print the group records */
        group = 8;
        for (i = 0; i < ngroups; i++) {
            /* type(1) + auxlen(1) + numsrc(2) + grp(16) */
            if (len < group + 20) {
                    ND_PRINT(" [invalid number of groups]");
                    return;
            }
            ND_TCHECK_LEN(bp + 4 + group, sizeof(nd_ipv6));
            ND_PRINT(" [gaddr %s", ip6addr_string(ndo, bp + group + 4));
            ND_PRINT(" %s", tok2str(mldv2report2str, " [v2-report-#%u]",
                                         EXTRACT_U_1(bp + group)));
            nsrcs = EXTRACT_BE_U_2(bp + group + 2);
            /* Check the number of sources and print them */
            if (len < group + 20 + (nsrcs * sizeof(nd_ipv6))) {
                    ND_PRINT(" [invalid number of sources %u]", nsrcs);
                    return;
            }
            if (ndo->ndo_vflag == 1)
                    ND_PRINT(", %u source(s)", nsrcs);
            else {
                /* Print the sources */
                    ND_PRINT(" {");
                for (j = 0; j < nsrcs; j++) {
                    ND_TCHECK_LEN(bp + group + 20 + (j * sizeof(nd_ipv6)),
                                  sizeof(nd_ipv6));
                    ND_PRINT(" %s", ip6addr_string(ndo, bp + group + 20 + (j * sizeof(nd_ipv6))));
                }
                ND_PRINT(" }");
            }
            /* Next group record */
            group += 20 + nsrcs * sizeof(nd_ipv6);
            ND_PRINT("]");
        }
    }
    return;
trunc:
    ND_PRINT("[|icmp6]");
    return;
}

static void
mldv2_query_print(netdissect_options *ndo, const u_char *bp, u_int len)
{
    const struct icmp6_hdr *icp = (const struct icmp6_hdr *) bp;
    u_int mrc;
    u_int mrt, qqi;
    u_int nsrcs;
    u_int i;

    /* Minimum len is 28 */
    if (len < 28) {
        ND_PRINT(" [invalid len %u]", len);
        return;
    }
    ND_TCHECK_2(icp->icmp6_data16[0]);
    mrc = EXTRACT_BE_U_2(icp->icmp6_data16[0]);
    if (mrc < 32768) {
        mrt = mrc;
    } else {
        mrt = ((mrc & 0x0fff) | 0x1000) << (((mrc & 0x7000) >> 12) + 3);
    }
    if (ndo->ndo_vflag) {
            ND_PRINT(" [max resp delay=%u]", mrt);
    }
    ND_TCHECK_LEN(bp + 8, sizeof(nd_ipv6));
    ND_PRINT(" [gaddr %s", ip6addr_string(ndo, bp + 8));

    if (ndo->ndo_vflag) {
        ND_TCHECK_1(bp + 25);
        if (EXTRACT_U_1(bp + 24) & 0x08) {
                ND_PRINT(" sflag");
        }
        if (EXTRACT_U_1(bp + 24) & 0x07) {
                ND_PRINT(" robustness=%u", EXTRACT_U_1(bp + 24) & 0x07);
        }
        if (EXTRACT_U_1(bp + 25) < 128) {
                qqi = EXTRACT_U_1(bp + 25);
        } else {
                qqi = ((EXTRACT_U_1(bp + 25) & 0x0f) | 0x10) <<
                       (((EXTRACT_U_1(bp + 25) & 0x70) >> 4) + 3);
        }
        ND_PRINT(" qqi=%u", qqi);
    }

    ND_TCHECK_2(bp + 26);
    nsrcs = EXTRACT_BE_U_2(bp + 26);
    if (nsrcs > 0) {
        if (len < 28 + nsrcs * sizeof(nd_ipv6))
            ND_PRINT(" [invalid number of sources]");
        else if (ndo->ndo_vflag > 1) {
            ND_PRINT(" {");
            for (i = 0; i < nsrcs; i++) {
                ND_TCHECK_LEN(bp + 28 + (i * sizeof(nd_ipv6)),
                              sizeof(nd_ipv6));
                ND_PRINT(" %s", ip6addr_string(ndo, bp + 28 + (i * sizeof(nd_ipv6))));
            }
            ND_PRINT(" }");
        } else
                ND_PRINT(", %u source(s)", nsrcs);
    }
    ND_PRINT("]");
    return;
trunc:
    ND_PRINT("[|icmp6]");
    return;
}

static void
dnsname_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
{
        int i;

        /* DNS name decoding - no decompression */
        ND_PRINT(", \"");
        while (cp < ep) {
                i = EXTRACT_U_1(cp);
                cp++;
                if (i) {
                        if (i > ep - cp) {
                                ND_PRINT("???");
                                break;
                        }
                        while (i-- && cp < ep) {
                                fn_print_char(ndo, EXTRACT_U_1(cp));
                                cp++;
                        }
                        if (cp + 1 < ep && EXTRACT_U_1(cp))
                                ND_PRINT(".");
                } else {
                        if (cp == ep) {
                                /* FQDN */
                                ND_PRINT(".");
                        } else if (cp + 1 == ep && EXTRACT_U_1(cp) == '\0') {
                                /* truncated */
                        } else {
                                /* invalid */
                                ND_PRINT("???");
                        }
                        break;
                }
        }
        ND_PRINT("\"");
}

static void
icmp6_nodeinfo_print(netdissect_options *ndo, u_int icmp6len, const u_char *bp, const u_char *ep)
{
        const struct icmp6_nodeinfo *ni6;
        const struct icmp6_hdr *dp;
        const u_char *cp;
        size_t siz, i;
        int needcomma;

        if (ep < bp)
                return;
        dp = (const struct icmp6_hdr *)bp;
        ni6 = (const struct icmp6_nodeinfo *)bp;
        siz = ep - bp;

        switch (EXTRACT_U_1(ni6->ni_type)) {
        case ICMP6_NI_QUERY:
                if (siz == sizeof(*dp) + 4) {
                        /* KAME who-are-you */
                        ND_PRINT(" who-are-you request");
                        break;
                }
                ND_PRINT(" node information query");

                ND_TCHECK_LEN(dp, sizeof(*ni6));
                ni6 = (const struct icmp6_nodeinfo *)dp;
                ND_PRINT(" ("); /*)*/
                switch (EXTRACT_BE_U_2(ni6->ni_qtype)) {
                case NI_QTYPE_NOOP:
                        ND_PRINT("noop");
                        break;
                case NI_QTYPE_SUPTYPES:
                        ND_PRINT("supported qtypes");
                        i = EXTRACT_BE_U_2(ni6->ni_flags);
                        if (i)
                                ND_PRINT(" [%s]", (i & 0x01) ? "C" : "");
                        break;
                case NI_QTYPE_FQDN:
                        ND_PRINT("DNS name");
                        break;
                case NI_QTYPE_NODEADDR:
                        ND_PRINT("node addresses");
                        i = EXTRACT_BE_U_2(ni6->ni_flags);
                        if (!i)
                                break;
                        /* NI_NODEADDR_FLAG_TRUNCATE undefined for query */
                        ND_PRINT(" [%s%s%s%s%s%s]",
                            (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
                            (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
                            (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
                            (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
                            (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
                            (i & NI_NODEADDR_FLAG_ALL) ? "A" : "");
                        break;
                default:
                        ND_PRINT("unknown");
                        break;
                }

                if (EXTRACT_BE_U_2(ni6->ni_qtype) == NI_QTYPE_NOOP ||
                    EXTRACT_BE_U_2(ni6->ni_qtype) == NI_QTYPE_SUPTYPES) {
                        if (siz != sizeof(*ni6))
                                if (ndo->ndo_vflag)
                                        ND_PRINT(", invalid len");
                        /*(*/
                        ND_PRINT(")");
                        break;
                }


                /* XXX backward compat, icmp-name-lookup-03 */
                if (siz == sizeof(*ni6)) {
                        ND_PRINT(", 03 draft");
                        /*(*/
                        ND_PRINT(")");
                        break;
                }

                cp = (const u_char *)(ni6 + 1);
                switch (EXTRACT_U_1(ni6->ni_code)) {
                case ICMP6_NI_SUBJ_IPV6:
                        if (!ND_TTEST_LEN(dp, sizeof(*ni6) + sizeof(nd_ipv6)))
                                break;
                        if (siz != sizeof(*ni6) + sizeof(nd_ipv6)) {
                                if (ndo->ndo_vflag)
                                        ND_PRINT(", invalid subject len");
                                break;
                        }
                        ND_PRINT(", subject=%s",
                                  ip6addr_string(ndo, cp));
                        break;
                case ICMP6_NI_SUBJ_FQDN:
                        ND_PRINT(", subject=DNS name");
                        if (EXTRACT_U_1(cp) == ep - cp - 1) {
                                /* icmp-name-lookup-03, pascal string */
                                if (ndo->ndo_vflag)
                                        ND_PRINT(", 03 draft");
                                cp++;
                                ND_PRINT(", \"");
                                while (cp < ep) {
                                        fn_print_char(ndo, EXTRACT_U_1(cp));
                                        cp++;
                                }
                                ND_PRINT("\"");
                        } else
                                dnsname_print(ndo, cp, ep);
                        break;
                case ICMP6_NI_SUBJ_IPV4:
                        if (!ND_TTEST_LEN(dp, sizeof(*ni6) + sizeof(nd_ipv4)))
                                break;
                        if (siz != sizeof(*ni6) + sizeof(nd_ipv4)) {
                                if (ndo->ndo_vflag)
                                        ND_PRINT(", invalid subject len");
                                break;
                        }
                        ND_PRINT(", subject=%s",
                                  ipaddr_string(ndo, cp));
                        break;
                default:
                        ND_PRINT(", unknown subject");
                        break;
                }

                /*(*/
                ND_PRINT(")");
                break;

        case ICMP6_NI_REPLY:
                if (icmp6len > siz) {
                        ND_PRINT("[|icmp6: node information reply]");
                        break;
                }

                needcomma = 0;

                ND_TCHECK_LEN(dp, sizeof(*ni6));
                ni6 = (const struct icmp6_nodeinfo *)dp;
                ND_PRINT(" node information reply");
                ND_PRINT(" ("); /*)*/
                switch (EXTRACT_U_1(ni6->ni_code)) {
                case ICMP6_NI_SUCCESS:
                        if (ndo->ndo_vflag) {
                                ND_PRINT("success");
                                needcomma++;
                        }
                        break;
                case ICMP6_NI_REFUSED:
                        ND_PRINT("refused");
                        needcomma++;
                        if (siz != sizeof(*ni6))
                                if (ndo->ndo_vflag)
                                        ND_PRINT(", invalid length");
                        break;
                case ICMP6_NI_UNKNOWN:
                        ND_PRINT("unknown");
                        needcomma++;
                        if (siz != sizeof(*ni6))
                                if (ndo->ndo_vflag)
                                        ND_PRINT(", invalid length");
                        break;
                }

                if (EXTRACT_U_1(ni6->ni_code) != ICMP6_NI_SUCCESS) {
                        /*(*/
                        ND_PRINT(")");
                        break;
                }

                switch (EXTRACT_BE_U_2(ni6->ni_qtype)) {
                case NI_QTYPE_NOOP:
                        if (needcomma)
                                ND_PRINT(", ");
                        ND_PRINT("noop");
                        if (siz != sizeof(*ni6))
                                if (ndo->ndo_vflag)
                                        ND_PRINT(", invalid length");
                        break;
                case NI_QTYPE_SUPTYPES:
                        if (needcomma)
                                ND_PRINT(", ");
                        ND_PRINT("supported qtypes");
                        i = EXTRACT_BE_U_2(ni6->ni_flags);
                        if (i)
                                ND_PRINT(" [%s]", (i & 0x01) ? "C" : "");
                        break;
                case NI_QTYPE_FQDN:
                        if (needcomma)
                                ND_PRINT(", ");
                        ND_PRINT("DNS name");
                        cp = (const u_char *)(ni6 + 1) + 4;
                        ND_TCHECK_1(cp);
                        if (EXTRACT_U_1(cp) == ep - cp - 1) {
                                /* icmp-name-lookup-03, pascal string */
                                if (ndo->ndo_vflag)
                                        ND_PRINT(", 03 draft");
                                cp++;
                                ND_PRINT(", \"");
                                while (cp < ep) {
                                        fn_print_char(ndo, EXTRACT_U_1(cp));
                                        cp++;
                                }
                                ND_PRINT("\"");
                        } else
                                dnsname_print(ndo, cp, ep);
                        if ((EXTRACT_BE_U_2(ni6->ni_flags) & 0x01) != 0)
                                ND_PRINT(" [TTL=%u]", EXTRACT_BE_U_4(ni6 + 1));
                        break;
                case NI_QTYPE_NODEADDR:
                        if (needcomma)
                                ND_PRINT(", ");
                        ND_PRINT("node addresses");
                        i = sizeof(*ni6);
                        while (i < siz) {
                                if (i + sizeof(uint32_t) + sizeof(nd_ipv6) > siz)
                                        break;
                                ND_PRINT(" %s(%u)",
                                    ip6addr_string(ndo, bp + i + sizeof(uint32_t)),
                                    EXTRACT_BE_U_4(bp + i));
                                i += sizeof(uint32_t) + sizeof(nd_ipv6);
                        }
                        i = EXTRACT_BE_U_2(ni6->ni_flags);
                        if (!i)
                                break;
                        ND_PRINT(" [%s%s%s%s%s%s%s]",
                                  (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
                                  (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
                                  (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
                                  (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
                                  (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
                                  (i & NI_NODEADDR_FLAG_ALL) ? "A" : "",
                                  (i & NI_NODEADDR_FLAG_TRUNCATE) ? "T" : "");
                        break;
                default:
                        if (needcomma)
                                ND_PRINT(", ");
                        ND_PRINT("unknown");
                        break;
                }

                /*(*/
                ND_PRINT(")");
                break;
        }
        return;

trunc:
        ND_PRINT("[|icmp6]");
}

static void
icmp6_rrenum_print(netdissect_options *ndo, const u_char *bp, const u_char *ep)
{
        const struct icmp6_router_renum *rr6;
        const char *cp;
        const struct rr_pco_match *match;
        const struct rr_pco_use *use;
        char hbuf[NI_MAXHOST];
        int n;

        if (ep < bp)
                return;
        rr6 = (const struct icmp6_router_renum *)bp;
        cp = (const char *)(rr6 + 1);

        ND_TCHECK_4(rr6->rr_reserved);
        switch (EXTRACT_U_1(rr6->rr_code)) {
        case ICMP6_ROUTER_RENUMBERING_COMMAND:
                ND_PRINT("router renum: command");
                break;
        case ICMP6_ROUTER_RENUMBERING_RESULT:
                ND_PRINT("router renum: result");
                break;
        case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
                ND_PRINT("router renum: sequence number reset");
                break;
        default:
                ND_PRINT("router renum: code-#%u", EXTRACT_U_1(rr6->rr_code));
                break;
        }

        ND_PRINT(", seq=%u", EXTRACT_BE_U_4(rr6->rr_seqnum));

        if (ndo->ndo_vflag) {
                uint8_t rr_flags = EXTRACT_U_1(rr6->rr_flags);
#define F(x, y) (rr_flags & (x) ? (y) : "")
                ND_PRINT("[");  /*]*/
                if (rr_flags) {
                        ND_PRINT("%s%s%s%s%s,", F(ICMP6_RR_FLAGS_TEST, "T"),
                                  F(ICMP6_RR_FLAGS_REQRESULT, "R"),
                                  F(ICMP6_RR_FLAGS_FORCEAPPLY, "A"),
                                  F(ICMP6_RR_FLAGS_SPECSITE, "S"),
                                  F(ICMP6_RR_FLAGS_PREVDONE, "P"));
                }
                ND_PRINT("seg=%u,", EXTRACT_U_1(rr6->rr_segnum));
                ND_PRINT("maxdelay=%u", EXTRACT_BE_U_2(rr6->rr_maxdelay));
                if (EXTRACT_BE_U_4(rr6->rr_reserved))
                        ND_PRINT("rsvd=0x%x", EXTRACT_BE_U_4(rr6->rr_reserved));
                /*[*/
                ND_PRINT("]");
#undef F
        }

        if (EXTRACT_U_1(rr6->rr_code) == ICMP6_ROUTER_RENUMBERING_COMMAND) {
                match = (const struct rr_pco_match *)cp;
                cp = (const char *)(match + 1);

                ND_TCHECK_16(match->rpm_prefix);

                if (ndo->ndo_vflag > 1)
                        ND_PRINT("\n\t");
                else
                        ND_PRINT(" ");
                ND_PRINT("match(");     /*)*/
                switch (EXTRACT_U_1(match->rpm_code)) {
                case RPM_PCO_ADD:       ND_PRINT("add"); break;
                case RPM_PCO_CHANGE:    ND_PRINT("change"); break;
                case RPM_PCO_SETGLOBAL: ND_PRINT("setglobal"); break;
                default:                ND_PRINT("#%u", EXTRACT_U_1(match->rpm_code)); break;
                }

                if (ndo->ndo_vflag) {
                        ND_PRINT(",ord=%u", EXTRACT_U_1(match->rpm_ordinal));
                        ND_PRINT(",min=%u", EXTRACT_U_1(match->rpm_minlen));
                        ND_PRINT(",max=%u", EXTRACT_U_1(match->rpm_maxlen));
                }
                if (addrtostr6(match->rpm_prefix, hbuf, sizeof(hbuf)))
                        ND_PRINT(",%s/%u", hbuf, EXTRACT_U_1(match->rpm_matchlen));
                else
                        ND_PRINT(",?/%u", EXTRACT_U_1(match->rpm_matchlen));
                /*(*/
                ND_PRINT(")");

                n = EXTRACT_U_1(match->rpm_len) - 3;
                if (n % 4)
                        goto trunc;
                n /= 4;
                while (n-- > 0) {
                        use = (const struct rr_pco_use *)cp;
                        cp = (const char *)(use + 1);

                        ND_TCHECK_16(use->rpu_prefix);

                        if (ndo->ndo_vflag > 1)
                                ND_PRINT("\n\t");
                        else
                                ND_PRINT(" ");
                        ND_PRINT("use(");       /*)*/
                        if (EXTRACT_U_1(use->rpu_flags)) {
#define F(x, y) (EXTRACT_U_1(use->rpu_flags) & (x) ? (y) : "")
                                ND_PRINT("%s%s,",
                                          F(ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME, "V"),
                                          F(ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME, "P"));
#undef F
                        }
                        if (ndo->ndo_vflag) {
                                ND_PRINT("mask=0x%x,", EXTRACT_U_1(use->rpu_ramask));
                                ND_PRINT("raflags=0x%x,", EXTRACT_U_1(use->rpu_raflags));
                                if (EXTRACT_BE_U_4(use->rpu_vltime) == 0xffffffff)
                                        ND_PRINT("vltime=infty,");
                                else
                                        ND_PRINT("vltime=%u,",
                                                  EXTRACT_BE_U_4(use->rpu_vltime));
                                if (EXTRACT_BE_U_4(use->rpu_pltime) == 0xffffffff)
                                        ND_PRINT("pltime=infty,");
                                else
                                        ND_PRINT("pltime=%u,",
                                                  EXTRACT_BE_U_4(use->rpu_pltime));
                        }
                        if (addrtostr6(use->rpu_prefix, hbuf, sizeof(hbuf)))
                                ND_PRINT("%s/%u/%u", hbuf, EXTRACT_U_1(use->rpu_uselen),
                                          EXTRACT_U_1(use->rpu_keeplen));
                        else
                                ND_PRINT("?/%u/%u", EXTRACT_U_1(use->rpu_uselen),
                                          EXTRACT_U_1(use->rpu_keeplen));
                        /*(*/
                        ND_PRINT(")");
                }
        }

        return;

trunc:
        ND_PRINT("[|icmp6]");
}