usr.sbin/snoop/snoop_mip.c

	snoop_mip.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1999 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <stdio.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <protocols/routed.h>
#include <string.h>
#include <arpa/inet.h>
#include "snoop.h"
#include "snoop_mip.h"

/*
 * This defines the length of internal, unbounded buffers. We set
 * this to be MAXLINE (the maximum verbose display line length) -
 * 64, which should be enough for all necessary descriptions.
 */
#define BUFLEN  MAXLINE - 64

extern char *dlc_header;
extern char *addrtoname();

static enum EXT_TYPE { ADV, REG };

/*
 * This defines the interface for all extention interpreter
 * functions. The function will be called with following
 * parameters:
 *
 * type:    IN  The type code for this extention
 * len      IN  The length of the payload (i.e. the
 *          length field in an extension header)
 * payload  IN  A pointer to the beginning of the
 *          extension payload
 */
typedef void interpreter_f(uint8_t type, uint8_t len, uchar_t *payload);

struct ext_dispatch {
    uint8_t type;
    interpreter_f *pfunc;
};

/* Description structure -- maps type to description */
struct ext_desc {
    uint8_t type;
    const char *desc;
};

/*
 * Interpreter function prototypes for both adv and reg. These
 * all must implement the interpret_f interface defined above.
 */
static void spi_ext(uint8_t, uint8_t, uchar_t *);
static void key_ext(uint8_t, uint8_t, uchar_t *);
static void trav_ext(uint8_t, uint8_t, uchar_t *);
static void empty_ext(uint8_t, uint8_t, uchar_t *);
static void nai_ext(uint8_t, uint8_t, uchar_t *);
static void chall_ext(uint8_t, uint8_t, uchar_t *);
static void ma_ext(uint8_t, uint8_t, uchar_t *);
static void prefix_ext(uint8_t, uint8_t, uchar_t *);
static void unk_ext(uint8_t, uint8_t, uchar_t *);

/* R E G I S T R A T I O N */

#define REG_TBL_LEN 10  /* update this when adding to the table */

/* Reg: type to description mapping table */
static struct ext_desc reg_desc[] = {
    MN_HA_AUTH, "(Mobile-Home Authentication Extension)",
    MN_FA_AUTH, "(Mobile-Foreign Authentication Extension",
    FA_HA_AUTH, "(Foreign-Home Authentication Extension)",
    GEN_AUTH,   "(Generalized Authentication Extension)",
    MN_HA_KEY,  "(Mobile-Home Key Extension)",
    MN_FA_KEY,  "(Mobile-Foreign Key Extension)",
    MN_HA_TRAVERSE, "(Firewall Traversal Extension)",
    ENCAP_DELIV,    "(Encapsulating Delivery Style Extension)",
    MN_NAI,     "(Mobile Node Network Access Identifier)",
    FA_CHALLENGE,   "(Mobile-Foreign Agent Challenge)",
    0,      "(Unrecognized Extension)"
};

#define GENAUTH_TBL_LEN 1   /* update this when adding to the table */

/* Subtypes for Generic Authentication Extension type (type 36) */
static struct ext_desc genauth_desc[] = {
    GEN_AUTH_MN_AAA,    "(MN-AAA Authentication Subtype)",
    0,          "(Unrecognized Subtype)"
};

/* Reg: type to function mapping table */
static struct ext_dispatch reg_dispatch[] = {
    MN_HA_AUTH, spi_ext,
    MN_FA_AUTH, spi_ext,
    FA_HA_AUTH, spi_ext,
    GEN_AUTH,   spi_ext,
    MN_HA_KEY,  key_ext,
    MN_FA_KEY,  key_ext,
    MN_HA_TRAVERSE, trav_ext,
    ENCAP_DELIV,    empty_ext,
    MN_NAI,     nai_ext,
    FA_CHALLENGE,   chall_ext,
    0,      unk_ext
};

/* A D V E R T I S E M E N T */

#define ADV_TBL_LEN 5   /* update this when adding to the table */

/* Adv: type to description mapping table */
static struct ext_desc adv_desc[] = {
    ICMP_ADV_MSG_PADDING_EXT,   "(Padding)",
    ICMP_ADV_MSG_MOBILITY_AGT_EXT,  "(Mobility Agent Extension)",
    ICMP_ADV_MSG_PREFIX_LENGTH_EXT, "(Prefix Lengths)",
    ICMP_ADV_MSG_FA_CHALLENGE,  "(Foreign Agent Challenge)",
    ICMP_ADV_MSG_FA_NAI,        "(Foreign Agent NAI)",
    0,              "(Unrecognized Extension)"
};

/* Adv: type to function mapping table */
static struct ext_dispatch adv_dispatch[] = {
    ICMP_ADV_MSG_PADDING_EXT,   NULL,   /* never called */
    ICMP_ADV_MSG_MOBILITY_AGT_EXT,  ma_ext,
    ICMP_ADV_MSG_PREFIX_LENGTH_EXT, prefix_ext,
    ICMP_ADV_MSG_FA_CHALLENGE,  chall_ext,
    ICMP_ADV_MSG_FA_NAI,        nai_ext,
    0,              unk_ext
};

#define GETSPI(payload, hi, low) \
    (void) memcpy(&hi, payload, sizeof (hi)); \
    (void) memcpy(&low, payload + sizeof (hi), sizeof (low))

static void dumphex(uchar_t *payload, int payload_len, char *buf, char *msg) {
    int index;

    for (index = 0; index < payload_len; index++) {
        (void) sprintf(&buf[index * 3], " %.2x", payload[index]);
    }

    (void) sprintf(get_line((char *)payload-dlc_header, 1), msg, buf);
}

static const char *get_desc(struct ext_desc table[], uint8_t type, int max) {
    int i;

    for (i = 0; i < max && table[i].type != type; i++)
        /* NO_OP */;

    return (table[i].desc);
}

/*
 * The following is an accessor for the description table, used by
 * snoop_icmp.c. This maintains the encapsulation of the internal
 * description table.
 */
const char *get_mip_adv_desc(uint8_t type) {
    return (get_desc(adv_desc, type, ADV_TBL_LEN));
}

static interpreter_f *get_interpreter(struct ext_dispatch table[],
                uint8_t type,
                int max) {
    int i;

    for (i = 0; i < max && table[i].type != type; i++)
        /* NO_OP */;

    return (table[i].pfunc);
}

static int
interpret_extensions(uchar_t *ext,
            int regext_size,
            enum EXT_TYPE etype) {

    int curr_size  =  regext_size; /* remaining total for all exts */
    exthdr_t *exthdr;
    gen_exthdr_t *gen_exthdr;
    const char *st;
    uchar_t *p;
    interpreter_f *f;
    uint8_t ext_type;
    uint16_t ext_len;
    uint_t ext_hdrlen;

    show_space();
    exthdr = (exthdr_t *)ALIGN(ext);


    do {
        ext_type = exthdr->type;
        if (ext_type == GEN_AUTH) {
        gen_exthdr = (gen_exthdr_t *)exthdr;
        ext_hdrlen = sizeof (gen_exthdr_t);
        ext_len = ntohs(gen_exthdr->length);
        } else {
        ext_hdrlen = sizeof (exthdr_t);
        ext_len = exthdr->length;
        }

        if (!((etype == ADV && ext_type == ICMP_ADV_MSG_PADDING_EXT &&
        curr_size >= 1) ||
        curr_size >= ext_hdrlen + ext_len))
            break;

        /* Print description for this extension */
        if (etype == ADV) {
        st = get_desc(adv_desc, ext_type, ADV_TBL_LEN);
        } else /* REG */ {
        st = get_desc(reg_desc, ext_type, REG_TBL_LEN);
        }

        (void) sprintf(get_line((char *)exthdr-dlc_header, 1),
            "Extension header type = %d  %s", ext_type, st);

        if (ext_type == GEN_AUTH) {
        st = get_desc(genauth_desc, gen_exthdr->subtype,
            GENAUTH_TBL_LEN);
        (void) sprintf(get_line((char *)exthdr-dlc_header, 1),
            "Subtype = %d %s", gen_exthdr->subtype, st);
        }

        /* Special case for 1-byte padding */
        if (etype == ADV && ext_type == ICMP_ADV_MSG_PADDING_EXT) {
        exthdr = (exthdr_t *)((uchar_t *)exthdr + 1);
        curr_size--;
        continue;
        }

        (void) sprintf(get_line((char *)&exthdr->length-dlc_header, 1),
            "Length = %d", ext_len);

        /* Parse out the extension's payload */
        p = (uchar_t *)exthdr + ext_hdrlen;
        curr_size -= (ext_hdrlen + ext_len);

        if (etype == ADV) {
        f = get_interpreter(adv_dispatch, ext_type, ADV_TBL_LEN);
        } else /* REG */ {
        f = get_interpreter(reg_dispatch, ext_type, REG_TBL_LEN);
        }

        f(ext_type, ext_len, p);

        show_space();
        exthdr = (exthdr_t *)(p + ext_len);
    } while (B_TRUE);

    return (0);
}

void interpret_icmp_mip_ext(uchar_t *p, int len) {
    show_space();
    show_header("ICMP:  ", " MIP Advertisement Extensions ", len);
    show_space();

    interpret_extensions(p, len, ADV);
}

void
interpret_mip_cntrlmsg(int flags, uchar_t *msg, int fraglen) {
    char        *pt, *pc = NULL;
    char        *line;
    regreq_t    rreq[1];
    regrep_t    rrep[1];
    int     regext_size;
    uchar_t     *regext_data;
    struct in_addr  addr_temp;


    /* First byte of the message should be the type */
    switch (*msg) {
    case REG_TYPE_REQ:
        if (fraglen < sizeof (regreq_t))
            return;
        pt = (flags & F_DTAIL ? "registration request ":"reg rqst ");

        (void) memcpy(rreq, msg, sizeof (*rreq));
        regext_size = fraglen - sizeof (regreq_t);
        regext_data = msg + sizeof (*rreq);
        break;
    case REG_TYPE_REP:
        if (fraglen < sizeof (regrep_t))
            return;
        pt = (flags & F_DTAIL ? "registration reply ":"reg reply ");

        (void) memcpy(rrep, msg, sizeof (*rrep));
        regext_size = fraglen - sizeof (regrep_t);
        regext_data = msg + sizeof (*rrep);

        switch (rrep->code) {
        case  REPLY_CODE_ACK:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL)) ?
                "OK" : "OK code 0";
            break;
        case  REPLY_CODE_ACK_NO_SIMULTANEOUS:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "OK simultaneous bindings" : "OK code 1";
            break;
        case  REPLY_CODE_FA_NACK_UNSPECIFIED:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: unspecified":"FA denial: code 64";
            break;
        case  REPLY_CODE_FA_NACK_PROHIBITED:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: prohibited":"FA denial: code 65";
            break;
        case  REPLY_CODE_FA_NACK_RESOURCES:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: no resources":"FA denial: code 66";
            break;
        case  REPLY_CODE_FA_NACK_MN_AUTH:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: MN auth failed":"FA denial: code 67";
            break;
        case  REPLY_CODE_FA_NACK_HA_AUTH:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: HA auth failed":
                "FA denial: code 68";
            break;
        case  REPLY_CODE_FA_NACK_LIFETIME:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: lifetime":"FA denial: code 69";
            break;
        case  REPLY_CODE_FA_NACK_BAD_REQUEST:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: bad request": "FA: code 70";
            break;
        case  REPLY_CODE_FA_NACK_BAD_REPLY:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: bad Reply":"FA denial: code 71";
            break;
        case  REPLY_CODE_FA_NACK_ENCAP_UNAVAILABLE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: encapsulation":"FA denial: code 72";
            break;
        case  REPLY_CODE_FA_NACK_VJ_UNAVAILABLE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: VJ compression":"FA denial: code 73";
            break;
        case  REPLY_CODE_FA_NACK_BIDIR_TUNNEL_UNAVAILABLE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: reverse tunnel unavailable":
                "FA denial: code 74";
            break;
        case  REPLY_CODE_FA_NACK_BIDIR_TUNNEL_NO_TBIT:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: reverse tunnel: missing T-bit":
                "FA denial: code 75";
            break;
        case  REPLY_CODE_FA_NACK_BIDIR_TUNNEL_TOO_DISTANT:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: reverse tunnel: too distant":
                "FA denial: code 76";
            break;
        case  REPLY_CODE_FA_NACK_ICMP_HA_NET_UNREACHABLE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: home network unreachable":
                "FA denial: code 80";
            break;
        case  REPLY_CODE_FA_NACK_ICMP_HA_HOST_UNREACHABLE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: HA host unreachable":
                "FA denial: code 81";
            break;
        case  REPLY_CODE_FA_NACK_ICMP_HA_PORT_UNREACHABLE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: HA port unreachable":
                "FA denial: code 82";
            break;
        case  REPLY_CODE_FA_NACK_ICMP_HA_UNREACHABLE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: HA unreachable":"FA denial: code 88";
            break;
        case REPLY_CODE_FA_NACK_UNIQUE_HOMEADDR_REQD:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: Unique Home Addr Required":
                "FA denial: code 96";
            break;
        case REPLY_CODE_FA_NACK_MISSING_NAI:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: Missing NAI":
                "FA denial: code 97";
            break;
        case REPLY_CODE_FA_NACK_MISSING_HOME_AGENT:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: Missing Home Agent":
                "FA denial: code 98";
            break;
        case REPLY_CODE_FA_NACK_UNKNOWN_CHALLENGE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: Unknown Challenge":
                "FA denial: code 104";
            break;
        case REPLY_CODE_FA_NACK_MISSING_CHALLENGE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: Missing Challenge":
                "FA denial: code 105";
            break;
        case REPLY_CODE_FA_NACK_MISSING_MN_FA:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "FA denial: Missing Mobile-Foreign Key Extension":
                "FA denial: code 106";
            break;
        case  REPLY_CODE_HA_NACK_UNSPECIFIED:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: unspecified":"HA denial: code 128";
            break;
        case  REPLY_CODE_HA_NACK_PROHIBITED:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: prohibited":"HA denial: code 129";
            break;
        case  REPLY_CODE_HA_NACK_RESOURCES:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: no resources":"HA denial: code 130";
            break;
        case  REPLY_CODE_HA_NACK_MN_AUTH:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: MN auth failed":"HA denial: code 131";
            break;
        case  REPLY_CODE_HA_NACK_FA_AUTH:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: FA auth failed":"HA denial: code 132";
            break;
        case  REPLY_CODE_HA_NACK_ID_MISMATCH:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: ID mismatch":"HA denial: code 133";
            break;
        case  REPLY_CODE_HA_NACK_BAD_REQUEST:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: bad request":"HA denial: code 134";
            break;
        case  REPLY_CODE_HA_NACK_TOO_MANY_BINDINGS:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: too many bindings":
                "HA denial: code 135";
            break;
        case  REPLY_CODE_HA_NACK_BAD_HA_ADDRESS:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: bad HA address":"HA denial: code 136";
            break;
        case  REPLY_CODE_HA_NACK_BIDIR_TUNNEL_UNAVAILABLE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: no reverse tunnel":
                "HA denial: code 137";
            break;
        case  REPLY_CODE_HA_NACK_BIDIR_TUNNEL_NO_TBIT:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: reverse tunnel: no T-bit":
                "HA denial: code 138";
            break;
        case  REPLY_CODE_HA_NACK_BIDIR_ENCAP_UNAVAILABLE:
            pc = ((flags & F_ALLSUM) || (flags & F_DTAIL))?
                "HA denial: encapsulation unavailable":
                "HA denial: code 139";
            break;
        default:
            pc = "?";
            break;
        }
        break;

    default :
        break;
    }
    if (flags & F_SUM) {
        line = get_sum_line();

        if (pc != NULL)
            (void) sprintf(line, "Mobile IP %s(%s)", pt, pc);
        else
            (void) sprintf(line, "Mobile IP %s", pt);
    }

    if (flags & F_DTAIL) {
        show_header("MIP:  ", "Mobile IP Header", fraglen);
        show_space();

        if (*msg == REG_TYPE_REQ) {
            (void) sprintf(get_line((char *)&rreq -
                dlc_header, 1), "Registration header type = %s",
                pt);
            (void) sprintf(get_line(
                (char *)(((uchar_t *)&rreq) + 1) - dlc_header, 1),
                "%d... .... = %s simultaneous bindings  ",
                (rreq->Simultaneous_registration == 1)? 1 : 0,
                (rreq->Simultaneous_registration == 1)? "":"no");
            (void) sprintf(get_line(
                (char *)(((uchar_t *)&rreq) + 1) - dlc_header, 1),
                ".%d.. .... = %s broadcast datagrams ",
                (rreq->Broadcasts_desired == 1) ?  1 : 0,
                (rreq->Broadcasts_desired == 1) ? "":"no");
            (void) sprintf(get_line(
                (char *)(((uchar_t *)&rreq) + 1) - dlc_header, 1),
                "..%d. .... = %s decapsulation by MN",
                (rreq->Decapsulation_done_locally == 1) ? 1 : 0,
                (rreq->Decapsulation_done_locally == 1) ?
                "" : "no");
            (void) sprintf(get_line(
                (char *)(((uchar_t *)&rreq) + 1) - dlc_header, 1),
                "...%d .... = %s minimum encapsulation ",
                (rreq->Minimal_encap_desired == 1) ? 1 : 0,
                (rreq->Minimal_encap_desired == 1) ? "" : "no");
            (void) sprintf(get_line(
                (char *)(((uchar_t *)&rreq) + 1) - dlc_header, 1),
                ".... %d... = %s GRE encapsulation ",
                (rreq->GRE_encap_desired == 1) ? 1 : 0,
                (rreq->GRE_encap_desired == 1) ? "" : "no");
            (void) sprintf(get_line(
                (char *)(((uchar_t *)&rreq) + 1) - dlc_header, 1),
                ".... .%d.. = %s VJ hdr Compression ",
                (rreq->VJ_compression_desired == 1) ? 1 : 0,
                (rreq->VJ_compression_desired == 1) ? "" : "no");
            (void) sprintf(get_line(
                (char *)(((uchar_t *)&rreq) + 1) - dlc_header, 1),
                ".... ..%d. = %s reverse tunnel",
                (rreq->BiDirectional_Tunnel_desired == 1) ? 1 : 0,
                (rreq->BiDirectional_Tunnel_desired == 1) ?
                "" : "no");
            if (ntohs(rreq->lifetime) == 0xffff) {
                (void) sprintf(get_line(
                    (char *)&rreq->lifetime - dlc_header, 1),
                    "Life Time = 0xFFFF (infinity)");
            } else if (ntohs(rreq->lifetime) == 0) {
                (void) sprintf(get_line(
                    (char *)&rreq->lifetime - dlc_header, 1),
                    "Life Time = 0 "
                    "(request for de-registration)");
            } else {
                (void) sprintf(get_line(
                    (char *)&rreq->lifetime - dlc_header, 1),
                    "Life time = %d seconds",
                    ntohs(rreq->lifetime));
            }
            addr_temp.s_addr = rreq->home_addr;
            (void) sprintf(get_line(
                (char *)&rreq->home_addr - dlc_header, 1),
                "Home address = %s, %s",
                inet_ntoa(addr_temp),
                addrtoname(AF_INET, &addr_temp));
            addr_temp.s_addr = rreq->home_agent_addr;
            (void) sprintf(get_line(
                (char *)&rreq->home_agent_addr - dlc_header, 1),
                "Home Agent address = %s, %s",
                inet_ntoa(addr_temp),
                addrtoname(AF_INET, &addr_temp));
            addr_temp.s_addr = rreq->care_of_addr;
            (void) sprintf(get_line(
                (char *)&rreq->care_of_addr - dlc_header, 1),
                "Care of address = %s, %s",
                inet_ntoa(addr_temp),
                addrtoname(AF_INET, &addr_temp));
            (void) sprintf(get_line(
                (char *)&rreq->identification - dlc_header, 1),
                "Identification = 0x%x-%x",
                ntohl(rreq->identification.high_bits),
                ntohl(rreq->identification.low_bits));
        } else if (*msg == REG_TYPE_REP) {
            (void) sprintf(
                get_line((char *)&rrep->type - dlc_header, 1),
                "Registration header type = %d (%s)",
                (int)rrep->type, pt);
            (void) sprintf(get_line((char *)&rrep - dlc_header, 1),
                "Code = %d %s", (int)rrep->code, pc);
            if (ntohs(rrep->lifetime) == 0xffff) {
                (void) sprintf(get_line(
                    (char *)&rrep->lifetime - dlc_header, 1),
                    "Life time = 0xFFFF (infinity)");
            } else if (ntohs(rrep->lifetime) == 0) {
                (void) sprintf(get_line(
                    (char *)&rrep->lifetime - dlc_header, 1),
                    ((rrep->code == REPLY_CODE_ACK) ||
                    (rrep->code ==
                    REPLY_CODE_ACK_NO_SIMULTANEOUS))?
                    "Life time = 0 (de-registeration success)" :
                    "Life time = 0 (de-registration failed)");
            } else {
                (void) sprintf(get_line(
                    (char *)&rrep->lifetime - dlc_header, 1),
                    "Life time = %d seconds",
                    ntohs(rrep->lifetime));
            }
            addr_temp.s_addr = rrep->home_addr;
            (void) sprintf(
                get_line((char *)&rrep->home_addr - dlc_header, 1),
                "Home address = %s, %s",
                inet_ntoa(addr_temp),
                addrtoname(AF_INET, &addr_temp));
            addr_temp.s_addr = rrep->home_agent_addr;
            (void) sprintf(get_line(
                (char *)&rrep->home_agent_addr - dlc_header, 1),
                "Home Agent address = %s, %s",
                inet_ntoa(addr_temp),
                addrtoname(AF_INET, &addr_temp));
            (void) sprintf(get_line(
                (char *)&rrep->identification - dlc_header, 1),
                "Identification = 0x%x-%x",
                ntohl(rrep->identification.high_bits),
                ntohl(rrep->identification.low_bits));
        }
        fraglen = interpret_extensions(regext_data, regext_size, REG);
    }
}

/*ARGSUSED*/
static void spi_ext(uint8_t type, uint8_t this_ext_len, uchar_t *p) {
    uint16_t spi_hi, spi_low;
    char    auth_prn_str[BUFLEN];

    /* SPI */
    GETSPI(p, spi_hi, spi_low);
    (void) sprintf(get_line((char *)p - dlc_header, 1),
            "Security Parameter Index = 0x%x%x",
            ntohs(spi_hi), ntohs(spi_low));
    p += sizeof (spi_hi) + sizeof (spi_low);
    this_ext_len -= sizeof (spi_hi) + sizeof (spi_low);

    /* The rest is the authenticator; dump it in hex */
    dumphex(p,
        /* don't write past our string buffer ... */
        (this_ext_len*3 > BUFLEN ? BUFLEN : this_ext_len),
        auth_prn_str,
        "Authenticator = %s");
}

static void key_ext(uint8_t type, uint8_t this_ext_len, uchar_t *p) {
    uint16_t alg, spi_hi, spi_low;
    char *alg_string;
    char *hafa = (type == MN_HA_KEY ? "HA" : "FA");
    char sec_msg[32];
    char auth_prn_str[BUFLEN];

    /* Algorithm Type */
    (void) memcpy(&alg, p, sizeof (alg));
    alg = ntohs(alg);
    switch (alg) {
    case KEY_ALG_NONE:
        alg_string = "None";
        break;
    case SA_MD5_MODE_PREF_SUF:
        alg_string = "MD5/prefix+suffix";
        break;
    case SA_HMAC_MD5:
        alg_string = "HMAC MD5";
        break;
    default:
        alg_string = "Unknown";
        break;
    }
    (void) sprintf(get_line((char *)p-dlc_header, 1),
            "Algorithm = 0x%x: %s", alg, alg_string);
    p += sizeof (alg);
    this_ext_len -= sizeof (alg);

    /* AAA SPI */
    GETSPI(p, spi_hi, spi_low);
    (void) sprintf(get_line((char *)p - dlc_header, 1),
            "AAA Security Parameter Index = 0x%x%x",
            ntohs(spi_hi), ntohs(spi_low));
    p += sizeof (spi_hi) + sizeof (spi_low);
    this_ext_len -= sizeof (spi_hi) + sizeof (spi_low);

    /* HA / FA SPI */
    GETSPI(p, spi_hi, spi_low);
    (void) sprintf(get_line((char *)p - dlc_header, 1),
            "%s Security Parameter Index = 0x%x%x",
            hafa, ntohs(spi_hi), ntohs(spi_low));
    p += sizeof (spi_hi) + sizeof (spi_low);
    this_ext_len -= sizeof (spi_hi) + sizeof (spi_low);

    /* The rest is the security info; dump it in hex */
    sprintf(sec_msg, "%s Security Info = %%s", hafa);
    dumphex(p,
        /* don't write past our string buffer ... */
        (this_ext_len*3 > BUFLEN ? BUFLEN : this_ext_len),
        auth_prn_str,
        sec_msg);
}

/*ARGSUSED*/
static void trav_ext(uint8_t type, uint8_t this_ext_len, uchar_t *p) {
    struct in_addr addr_temp;

    /* skip reserved */
    p += 2;
    this_ext_len -= 2;

    /* Mobile-Home Traversal Address */
    (void) memcpy(&(addr_temp.s_addr), p, sizeof (addr_temp.s_addr));
    (void) sprintf(get_line((char *)p-dlc_header, 1),
            "Mobile-Home Traversal Address= %s, %s",
            inet_ntoa(addr_temp),
            addrtoname(AF_INET, &addr_temp));
    p += sizeof (addr_temp.s_addr);
    this_ext_len -= sizeof (addr_temp.s_addr);

    /* Home-Mobile Traversal Address */
    (void) memcpy(&(addr_temp.s_addr), p, sizeof (addr_temp.s_addr));
    (void) sprintf(get_line((char *)p-dlc_header, 1),
            "Home-Mobile Traversal Address= %s, %s",
            inet_ntoa(addr_temp),
            addrtoname(AF_INET, &addr_temp));
}

/*ARGSUSED*/
static void empty_ext(uint8_t type, uint8_t this_ext_len, uchar_t *p) {
    /* no payload */
}

/*ARGSUSED*/
static void nai_ext(uint8_t type, uint8_t this_ext_len, uchar_t *p) {
    /* payload points to the NAI */
    char *desc = "Network Access Identifier = ";
    size_t desclen = strlen(desc) + 1 + this_ext_len;

    (void) snprintf(get_line((char *)p-dlc_header, 1),
            desclen > MAXLINE ? MAXLINE : desclen,
            "%s%s", desc, p);
}

/*ARGSUSED*/
static void chall_ext(uint8_t type, uint8_t this_ext_len, uchar_t *p) {
    char    auth_prn_str[BUFLEN];

    /* payload points to the challenge */
    dumphex(p,
        /* don't write past our string buffer ... */
        (this_ext_len*3 > BUFLEN ? BUFLEN / 3 : this_ext_len),
        auth_prn_str,
        "Challenge = %s");
}

/*ARGSUSED*/
static void ma_ext(uint8_t type, uint8_t this_ext_len, uchar_t *p) {
    mobagtadvext_t adv_ext[1];
    int i, len;
    struct in_addr temp_addr;

    (void) memcpy(adv_ext, p - sizeof (exthdr_t), sizeof (*adv_ext));
    (void) sprintf(get_line(0, 0), "Sequence number = %d",
            ntohs(adv_ext->sequence_num));
    (void) sprintf(get_line(0, 0),
            "Registration lifetime = %d seconds",
            ntohs(adv_ext->reg_lifetime));
    if (adv_ext->reg_bit) {
        (void) sprintf(get_line(0, 0),
                "1... .... = registration required "
                "through FA");
    } else {
        (void) sprintf(get_line(0, 0),
                "0... .... = registration not required "
                "through FA");
    }
    if (adv_ext->busy_bit) {
        (void) sprintf(get_line(0, 0), ".1.. .... = FA busy");
    } else {
        (void) sprintf(get_line(0, 0), ".0.. .... = FA not busy");
    }
    if (adv_ext->ha_bit) {
        (void) sprintf(get_line(0, 0), "..1. .... = node is HA");
    } else {
        (void) sprintf(get_line(0, 0), "..0. .... = node not HA");
    }
    if (adv_ext->fa_bit) {
        (void) sprintf(get_line(0, 0), "...1 .... = node is FA ");
    } else {
        (void) sprintf(get_line(0, 0), "...0 .... = node not FA ");
    }
    if (adv_ext->minencap_bit) {
        (void) sprintf(get_line(0, 0), ".... 1... = minimal encapsulation "
                            "supported");
    } else {
        (void) sprintf(get_line(0, 0),
                ".... 0... = no minimal encapsulation");
    }
    if (adv_ext->greencap_bit) {
        (void) sprintf(get_line(0, 0),
                ".... .1.. =  GRE encapsulation supported");
    } else {
        (void) sprintf(get_line(0, 0),
                ".... .0.. = no GRE encapsulation");
    }
    if (adv_ext->vanjacob_hdr_comp_bit) {
        (void) sprintf(get_line(0, 0),
                ".... ..1. = VJ header compression");
    } else {
        (void) sprintf(get_line(0, 0),
                ".... ..0. = no VJ header compression");
    }
    if (adv_ext->reverse_tunnel_bit) {
        (void) sprintf(get_line(0, 0),
                ".... ...1 = reverse tunneling supported");
    } else {
        (void) sprintf(get_line(0, 0),
                ".... ...0 = no reverse tunneling");
    }
    (void) sprintf(get_line(0, 0),
            "Reserved Byte = 0x%x", adv_ext->reserved);

    /* Parse out COA's */
    p += sizeof (*adv_ext);
    len = this_ext_len + sizeof (exthdr_t);
    /* this_ext_len is unsigned, and here we need a signed number */
    len -= sizeof (*adv_ext);

    for (i = 0; len >= sizeof (temp_addr.s_addr); i++) {
        memcpy(&(temp_addr.s_addr), p - sizeof (exthdr_t),
        sizeof (temp_addr.s_addr));

        (void) sprintf(get_line(0, 0),
                "Care of address-%d = %s, %s", i,
                inet_ntoa(temp_addr),
                addrtoname(AF_INET, &temp_addr));

        p += sizeof (temp_addr);
        len -= sizeof (temp_addr);
    }
}

/*ARGSUSED*/
static void prefix_ext(uint8_t type, uint8_t this_ext_len, uchar_t *p) {
    int i;

    for (i = 0; i < this_ext_len; i++) {
        (void) sprintf(get_line(0, 0),
                "Prefix length of router address[%d] "
                "= %d bits",
                i, p[i]);
    }
}

/*ARGSUSED*/
static void unk_ext(uint8_t type, uint8_t this_ext_len, uchar_t *p) {
    char    auth_prn_str[BUFLEN];

    /* Unknown extension; just dump the rest of the payload */
    dumphex(p,
        /* don't write past our string buffer ... */
        (this_ext_len*3 > BUFLEN ? BUFLEN : this_ext_len),
        auth_prn_str,
        "Payload = %s");
}