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print-l2tp.c

/*
 * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
 *      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.
 *
 * L2TP support contributed by Motonori Shindo (mshindo@mshindo.net)
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-l2tp.c,v 1.14.2.3 2003/12/26 23:21:42 guy Exp $";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>

#include "l2tp.h"
#include "interface.h"
#include "extract.h"

static char tstr[] = " [|l2tp]";

#ifndef TRUE
#define TRUE 1
#endif

#ifndef FALSE
#define FALSE 0
#endif

#define     L2TP_MSGTYPE_SCCRQ      1  /* Start-Control-Connection-Request */
#define     L2TP_MSGTYPE_SCCRP      2  /* Start-Control-Connection-Reply */
#define     L2TP_MSGTYPE_SCCCN      3  /* Start-Control-Connection-Connected */
#define     L2TP_MSGTYPE_STOPCCN    4  /* Stop-Control-Connection-Notification */
#define     L2TP_MSGTYPE_HELLO      6  /* Hello */
#define     L2TP_MSGTYPE_OCRQ 7  /* Outgoing-Call-Request */
#define     L2TP_MSGTYPE_OCRP 8  /* Outgoing-Call-Reply */
#define     L2TP_MSGTYPE_OCCN 9  /* Outgoing-Call-Connected */
#define     L2TP_MSGTYPE_ICRQ 10 /* Incoming-Call-Request */
#define     L2TP_MSGTYPE_ICRP 11 /* Incoming-Call-Reply */
#define     L2TP_MSGTYPE_ICCN 12 /* Incoming-Call-Connected */
#define     L2TP_MSGTYPE_CDN  14 /* Call-Disconnect-Notify */
#define     L2TP_MSGTYPE_WEN  15 /* WAN-Error-Notify */
#define     L2TP_MSGTYPE_SLI  16 /* Set-Link-Info */

static struct tok l2tp_msgtype2str[] = {
      { L2TP_MSGTYPE_SCCRQ,   "SCCRQ" },
      { L2TP_MSGTYPE_SCCRP,   "SCCRP" },
      { L2TP_MSGTYPE_SCCCN,   "SCCCN" },
      { L2TP_MSGTYPE_STOPCCN, "StopCCN" },
      { L2TP_MSGTYPE_HELLO,   "HELLO" },
      { L2TP_MSGTYPE_OCRQ,    "OCRQ" },
      { L2TP_MSGTYPE_OCRP,    "OCRP" },
      { L2TP_MSGTYPE_OCCN,    "OCCN" },
      { L2TP_MSGTYPE_ICRQ,    "ICRQ" },
      { L2TP_MSGTYPE_ICRP,    "ICRP" },
      { L2TP_MSGTYPE_ICCN,    "ICCN" },
      { L2TP_MSGTYPE_CDN,     "CDN" },
      { L2TP_MSGTYPE_WEN,     "WEN" },
      { L2TP_MSGTYPE_SLI,     "SLI" },
      { 0,              NULL }
};

#define L2TP_AVP_MSGTYPE            0  /* Message Type */
#define L2TP_AVP_RESULT_CODE        1  /* Result Code */
#define L2TP_AVP_PROTO_VER          2  /* Protocol Version */
#define L2TP_AVP_FRAMING_CAP        3  /* Framing Capabilities */
#define L2TP_AVP_BEARER_CAP         4  /* Bearer Capabilities */
#define L2TP_AVP_TIE_BREAKER        5  /* Tie Breaker */
#define L2TP_AVP_FIRM_VER           6  /* Firmware Revision */
#define L2TP_AVP_HOST_NAME          7  /* Host Name */
#define L2TP_AVP_VENDOR_NAME        8  /* Vendor Name */
#define L2TP_AVP_ASSND_TUN_ID             9  /* Assigned Tunnel ID */
#define L2TP_AVP_RECV_WIN_SIZE            10 /* Receive Window Size */
#define L2TP_AVP_CHALLENGE          11 /* Challenge */
#define L2TP_AVP_Q931_CC            12 /* Q.931 Cause Code */
#define L2TP_AVP_CHALLENGE_RESP           13 /* Challenge Response */
#define L2TP_AVP_ASSND_SESS_ID      14 /* Assigned Session ID */
#define L2TP_AVP_CALL_SER_NUM             15 /* Call Serial Number */
#define L2TP_AVP_MINIMUM_BPS        16 /* Minimum BPS */
#define L2TP_AVP_MAXIMUM_BPS        17 /* Maximum BPS */
#define L2TP_AVP_BEARER_TYPE        18 /* Bearer Type */
#define L2TP_AVP_FRAMING_TYPE             19 /* Framing Type */
#define L2TP_AVP_PACKET_PROC_DELAY  20 /* Packet Processing Delay (OBSOLETE) */
#define L2TP_AVP_CALLED_NUMBER            21 /* Called Number */
#define L2TP_AVP_CALLING_NUMBER           22 /* Calling Number */
#define L2TP_AVP_SUB_ADDRESS        23 /* Sub-Address */
#define L2TP_AVP_TX_CONN_SPEED            24 /* (Tx) Connect Speed */
#define L2TP_AVP_PHY_CHANNEL_ID           25 /* Physical Channel ID */
#define L2TP_AVP_INI_RECV_LCP       26 /* Initial Received LCP CONFREQ */
#define L2TP_AVP_LAST_SENT_LCP            27 /* Last Sent LCP CONFREQ */
#define L2TP_AVP_LAST_RECV_LCP            28 /* Last Received LCP CONFREQ */
#define L2TP_AVP_PROXY_AUTH_TYPE    29 /* Proxy Authen Type */
#define L2TP_AVP_PROXY_AUTH_NAME    30 /* Proxy Authen Name */
#define L2TP_AVP_PROXY_AUTH_CHAL    31 /* Proxy Authen Challenge */
#define L2TP_AVP_PROXY_AUTH_ID            32 /* Proxy Authen ID */
#define L2TP_AVP_PROXY_AUTH_RESP    33 /* Proxy Authen Response */
#define L2TP_AVP_CALL_ERRORS        34 /* Call Errors */
#define L2TP_AVP_ACCM               35 /* ACCM */
#define L2TP_AVP_RANDOM_VECTOR            36 /* Random Vector */
#define L2TP_AVP_PRIVATE_GRP_ID           37 /* Private Group ID */
#define L2TP_AVP_RX_CONN_SPEED            38 /* (Rx) Connect Speed */
#define L2TP_AVP_SEQ_REQUIRED             39 /* Sequencing Required */
#define L2TP_AVP_PPP_DISCON_CC            46 /* PPP Disconnect Cause Code */

static struct tok l2tp_avp2str[] = {
      { L2TP_AVP_MSGTYPE,           "MSGTYPE" },
      { L2TP_AVP_RESULT_CODE,       "RESULT_CODE" },
      { L2TP_AVP_PROTO_VER,         "PROTO_VER" },
      { L2TP_AVP_FRAMING_CAP,       "FRAMING_CAP" },
      { L2TP_AVP_BEARER_CAP,        "BEARER_CAP" },
      { L2TP_AVP_TIE_BREAKER,       "TIE_BREAKER" },
      { L2TP_AVP_FIRM_VER,          "FIRM_VER" },
      { L2TP_AVP_HOST_NAME,         "HOST_NAME" },
      { L2TP_AVP_VENDOR_NAME,       "VENDOR_NAME" },
      { L2TP_AVP_ASSND_TUN_ID,      "ASSND_TUN_ID" },
      { L2TP_AVP_RECV_WIN_SIZE,     "RECV_WIN_SIZE" },
      { L2TP_AVP_CHALLENGE,         "CHALLENGE" },
      { L2TP_AVP_Q931_CC,           "Q931_CC", },
      { L2TP_AVP_CHALLENGE_RESP,    "CHALLENGE_RESP" },
      { L2TP_AVP_ASSND_SESS_ID,     "ASSND_SESS_ID" },
      { L2TP_AVP_CALL_SER_NUM,      "CALL_SER_NUM" },
      { L2TP_AVP_MINIMUM_BPS,       "MINIMUM_BPS" },
      { L2TP_AVP_MAXIMUM_BPS,       "MAXIMUM_BPS" },
      { L2TP_AVP_BEARER_TYPE,       "BEARER_TYPE" },
      { L2TP_AVP_FRAMING_TYPE,      "FRAMING_TYPE" },
      { L2TP_AVP_PACKET_PROC_DELAY, "PACKET_PROC_DELAY" },
      { L2TP_AVP_CALLED_NUMBER,     "CALLED_NUMBER" },
      { L2TP_AVP_CALLING_NUMBER,    "CALLING_NUMBER" },
      { L2TP_AVP_SUB_ADDRESS,       "SUB_ADDRESS" },
      { L2TP_AVP_TX_CONN_SPEED,     "TX_CONN_SPEED" },
      { L2TP_AVP_PHY_CHANNEL_ID,    "PHY_CHANNEL_ID" },
      { L2TP_AVP_INI_RECV_LCP,      "INI_RECV_LCP" },
      { L2TP_AVP_LAST_SENT_LCP,     "LAST_SENT_LCP" },
      { L2TP_AVP_LAST_RECV_LCP,     "LAST_RECV_LCP" },
      { L2TP_AVP_PROXY_AUTH_TYPE,   "PROXY_AUTH_TYPE" },
      { L2TP_AVP_PROXY_AUTH_NAME,   "PROXY_AUTH_NAME" },
      { L2TP_AVP_PROXY_AUTH_CHAL,   "PROXY_AUTH_CHAL" },
      { L2TP_AVP_PROXY_AUTH_ID,     "PROXY_AUTH_ID" },
      { L2TP_AVP_PROXY_AUTH_RESP,   "PROXY_AUTH_RESP" },
      { L2TP_AVP_CALL_ERRORS,       "CALL_ERRORS" },
      { L2TP_AVP_ACCM,        "ACCM" },
      { L2TP_AVP_RANDOM_VECTOR,     "RANDOM_VECTOR" },
      { L2TP_AVP_PRIVATE_GRP_ID,    "PRIVATE_GRP_ID" },
      { L2TP_AVP_RX_CONN_SPEED,     "RX_CONN_SPEED" },
      { L2TP_AVP_SEQ_REQUIRED,      "SEQ_REQUIRED" },
      { L2TP_AVP_PPP_DISCON_CC,     "PPP_DISCON_CC" },
      { 0,                    NULL }
};

static struct tok l2tp_authentype2str[] = {
      { L2TP_AUTHEN_TYPE_RESERVED,  "Reserved" },
      { L2TP_AUTHEN_TYPE_TEXTUAL,   "Textual" },
      { L2TP_AUTHEN_TYPE_CHAP,      "CHAP" },
      { L2TP_AUTHEN_TYPE_PAP,       "PAP" },
      { L2TP_AUTHEN_TYPE_NO_AUTH,   "No Auth" },
      { L2TP_AUTHEN_TYPE_MSCHAPv1,  "MS-CHAPv1" },
      { 0,                    NULL }
};

#define L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL     0
#define L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER    1
#define L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL   2

static struct tok l2tp_cc_direction2str[] = {
      { L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL,    "global error" },
      { L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER,   "at peer" },
      { L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL,"at local" },
      { 0,                          NULL }
};

#if 0
static char *l2tp_result_code_StopCCN[] = {
         "Reserved",
         "General request to clear control connection",
         "General error--Error Code indicates the problem",
         "Control channel already exists",
         "Requester is not authorized to establish a control channel",
         "The protocol version of the requester is not supported",
         "Requester is being shut down",
         "Finite State Machine error"
#define L2TP_MAX_RESULT_CODE_STOPCC_INDEX 8
};
#endif

#if 0
static char *l2tp_result_code_CDN[] = {
      "Reserved",
      "Call disconnected due to loss of carrier",
      "Call disconnected for the reason indicated in error code",
      "Call disconnected for administrative reasons",
      "Call failed due to lack of appropriate facilities being " \
      "available (temporary condition)",
      "Call failed due to lack of appropriate facilities being " \
      "available (permanent condition)",
      "Invalid destination",
      "Call failed due to no carrier detected",
      "Call failed due to detection of a busy signal",
      "Call failed due to lack of a dial tone",
      "Call was not established within time allotted by LAC",
      "Call was connected but no appropriate framing was detected"
#define L2TP_MAX_RESULT_CODE_CDN_INDEX    12
};
#endif

#if 0
static char *l2tp_error_code_general[] = {
      "No general error",
      "No control connection exists yet for this LAC-LNS pair",
      "Length is wrong",
      "One of the field values was out of range or " \
      "reserved field was non-zero"
      "Insufficient resources to handle this operation now",
      "The Session ID is invalid in this context",
      "A generic vendor-specific error occurred in the LAC",
      "Try another"
#define L2TP_MAX_ERROR_CODE_GENERAL_INDEX 8
};
#endif

/******************************/
/* generic print out routines */
/******************************/
static void
print_string(const u_char *dat, u_int length)
{
      u_int i;
      for (i=0; i<length; i++) {
            printf("%c", *dat++);
      }
}

static void
print_octets(const u_char *dat, u_int length)
{
      u_int i;
      for (i=0; i<length; i++) {
            printf("%02x", *dat++);
      }
}

static void
print_16bits_val(const u_int16_t *dat)
{
      printf("%u", EXTRACT_16BITS(dat));
}

static void
print_32bits_val(const u_int32_t *dat)
{
      printf("%lu", (u_long)EXTRACT_32BITS(dat));
}

/***********************************/
/* AVP-specific print out routines */
/***********************************/
static void
l2tp_msgtype_print(const u_char *dat)
{
      u_int16_t *ptr = (u_int16_t*)dat;

      printf("%s", tok2str(l2tp_msgtype2str, "MSGTYPE-#%u",
          EXTRACT_16BITS(ptr)));
}

static void
l2tp_result_code_print(const u_char *dat, u_int length)
{
      u_int16_t *ptr = (u_int16_t *)dat;

      printf("%u", EXTRACT_16BITS(ptr)); ptr++; /* Result Code */
      if (length > 2) {                   /* Error Code (opt) */
              printf("/%u", EXTRACT_16BITS(ptr)); ptr++;
      }
      if (length > 4) {                   /* Error Message (opt) */
            printf(" ");
            print_string((u_char *)ptr, length - 4);
      }
}

static void
l2tp_proto_ver_print(const u_int16_t *dat)
{
      printf("%u.%u", (EXTRACT_16BITS(dat) >> 8),
          (EXTRACT_16BITS(dat) & 0xff));
}

static void
l2tp_framing_cap_print(const u_char *dat)
{
      u_int32_t *ptr = (u_int32_t *)dat;

      if (EXTRACT_32BITS(ptr) &  L2TP_FRAMING_CAP_ASYNC_MASK) {
            printf("A");
      }
      if (EXTRACT_32BITS(ptr) &  L2TP_FRAMING_CAP_SYNC_MASK) {
            printf("S");
      }
}

static void
l2tp_bearer_cap_print(const u_char *dat)
{
      u_int32_t *ptr = (u_int32_t *)dat;

      if (EXTRACT_32BITS(ptr) &  L2TP_BEARER_CAP_ANALOG_MASK) {
            printf("A");
      }
      if (EXTRACT_32BITS(ptr) &  L2TP_BEARER_CAP_DIGITAL_MASK) {
            printf("D");
      }
}

static void
l2tp_q931_cc_print(const u_char *dat, u_int length)
{
      print_16bits_val((u_int16_t *)dat);
      printf(", %02x", dat[2]);
      if (length > 3) {
            printf(" ");
            print_string(dat+3, length-3);
      }
}

static void
l2tp_bearer_type_print(const u_char *dat)
{
      u_int32_t *ptr = (u_int32_t *)dat;

      if (EXTRACT_32BITS(ptr) &  L2TP_BEARER_TYPE_ANALOG_MASK) {
            printf("A");
      }
      if (EXTRACT_32BITS(ptr) &  L2TP_BEARER_TYPE_DIGITAL_MASK) {
            printf("D");
      }
}

static void
l2tp_framing_type_print(const u_char *dat)
{
      u_int32_t *ptr = (u_int32_t *)dat;

      if (EXTRACT_32BITS(ptr) &  L2TP_FRAMING_TYPE_ASYNC_MASK) {
            printf("A");
      }
      if (EXTRACT_32BITS(ptr) &  L2TP_FRAMING_TYPE_SYNC_MASK) {
            printf("S");
      }
}

static void
l2tp_packet_proc_delay_print(void)
{
      printf("obsolete");
}

static void
l2tp_proxy_auth_type_print(const u_char *dat)
{
      u_int16_t *ptr = (u_int16_t *)dat;

      printf("%s", tok2str(l2tp_authentype2str,
                       "AuthType-#%u", EXTRACT_16BITS(ptr)));
}

static void
l2tp_proxy_auth_id_print(const u_char *dat)
{
      u_int16_t *ptr = (u_int16_t *)dat;

      printf("%u", EXTRACT_16BITS(ptr) & L2TP_PROXY_AUTH_ID_MASK);
}

static void
l2tp_call_errors_print(const u_char *dat)
{
      u_int16_t *ptr = (u_int16_t *)dat;
      u_int16_t val_h, val_l;

      ptr++;            /* skip "Reserved" */

      val_h = EXTRACT_16BITS(ptr); ptr++;
      val_l = EXTRACT_16BITS(ptr); ptr++;
      printf("CRCErr=%u ", (val_h<<16) + val_l);

      val_h = EXTRACT_16BITS(ptr); ptr++;
      val_l = EXTRACT_16BITS(ptr); ptr++;
      printf("FrameErr=%u ", (val_h<<16) + val_l);

      val_h = EXTRACT_16BITS(ptr); ptr++;
      val_l = EXTRACT_16BITS(ptr); ptr++;
      printf("HardOver=%u ", (val_h<<16) + val_l);

      val_h = EXTRACT_16BITS(ptr); ptr++;
      val_l = EXTRACT_16BITS(ptr); ptr++;
      printf("BufOver=%u ", (val_h<<16) + val_l);

      val_h = EXTRACT_16BITS(ptr); ptr++;
      val_l = EXTRACT_16BITS(ptr); ptr++;
      printf("Timeout=%u ", (val_h<<16) + val_l);

      val_h = EXTRACT_16BITS(ptr); ptr++;
      val_l = EXTRACT_16BITS(ptr); ptr++;
      printf("AlignErr=%u ", (val_h<<16) + val_l);
}

static void
l2tp_accm_print(const u_char *dat)
{
      u_int16_t *ptr = (u_int16_t *)dat;
      u_int16_t val_h, val_l;

      ptr++;            /* skip "Reserved" */

      val_h = EXTRACT_16BITS(ptr); ptr++;
      val_l = EXTRACT_16BITS(ptr); ptr++;
      printf("send=%08x ", (val_h<<16) + val_l);

      val_h = EXTRACT_16BITS(ptr); ptr++;
      val_l = EXTRACT_16BITS(ptr); ptr++;
      printf("recv=%08x ", (val_h<<16) + val_l);
}

static void
l2tp_ppp_discon_cc_print(const u_char *dat, u_int length)
{
      u_int16_t *ptr = (u_int16_t *)dat;

      printf("%04x, ", EXTRACT_16BITS(ptr)); ptr++;   /* Disconnect Code */
      printf("%04x ",  EXTRACT_16BITS(ptr)); ptr++;   /* Control Protocol Number */
      printf("%s", tok2str(l2tp_cc_direction2str,
                       "Direction-#%u", *((u_char *)ptr++)));

      if (length > 5) {
            printf(" ");
            print_string((const u_char *)ptr, length-5);
      }
}

static void
l2tp_avp_print(const u_char *dat, int length)
{
      u_int len;
      const u_int16_t *ptr = (u_int16_t *)dat;
      u_int16_t attr_type;
      int hidden = FALSE;

      if (length <= 0) {
            return;
      }

      printf(" ");

      TCHECK(*ptr);     /* Flags & Length */
      len = EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_LEN_MASK;

      /* If it is not long enough to contain the header, we'll give up. */
      if (len < 6)
            goto trunc;

      /* If it goes past the end of the remaining length of the packet,
         we'll give up. */
      if (len > (u_int)length)
            goto trunc;

      /* If it goes past the end of the remaining length of the captured
         data, we'll give up. */
      TCHECK2(*ptr, len);
      /* After this point, no need to worry about truncation */

      if (EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_FLAG_MANDATORY) {
            printf("*");
      }
      if (EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_FLAG_HIDDEN) {
            hidden = TRUE;
            printf("?");
      }
      ptr++;

      if (EXTRACT_16BITS(ptr)) {
            /* Vendor Specific Attribute */
              printf("VENDOR%04x:", EXTRACT_16BITS(ptr)); ptr++;
            printf("ATTR%04x", EXTRACT_16BITS(ptr)); ptr++;
            printf("(");
            print_octets((u_char *)ptr, len-6);
            printf(")");
      } else {
            /* IETF-defined Attributes */
            ptr++;
            attr_type = EXTRACT_16BITS(ptr); ptr++;
            printf("%s", tok2str(l2tp_avp2str, "AVP-#%u", attr_type));
            printf("(");
            if (hidden) {
                  printf("???");
            } else {
                  switch (attr_type) {
                  case L2TP_AVP_MSGTYPE:
                        l2tp_msgtype_print((u_char *)ptr);
                        break;
                  case L2TP_AVP_RESULT_CODE:
                        l2tp_result_code_print((u_char *)ptr, len-6);
                        break;
                  case L2TP_AVP_PROTO_VER:
                        l2tp_proto_ver_print(ptr);
                        break;
                  case L2TP_AVP_FRAMING_CAP:
                        l2tp_framing_cap_print((u_char *)ptr);
                        break;
                  case L2TP_AVP_BEARER_CAP:
                        l2tp_bearer_cap_print((u_char *)ptr);
                        break;
                  case L2TP_AVP_TIE_BREAKER:
                        print_octets((u_char *)ptr, 8);
                        break;
                  case L2TP_AVP_FIRM_VER:
                  case L2TP_AVP_ASSND_TUN_ID:
                  case L2TP_AVP_RECV_WIN_SIZE:
                  case L2TP_AVP_ASSND_SESS_ID:
                        print_16bits_val(ptr);
                        break;
                  case L2TP_AVP_HOST_NAME:
                  case L2TP_AVP_VENDOR_NAME:
                  case L2TP_AVP_CALLING_NUMBER:
                  case L2TP_AVP_CALLED_NUMBER:
                  case L2TP_AVP_SUB_ADDRESS:
                  case L2TP_AVP_PROXY_AUTH_NAME:
                  case L2TP_AVP_PRIVATE_GRP_ID:
                        print_string((u_char *)ptr, len-6);
                        break;
                  case L2TP_AVP_CHALLENGE:
                  case L2TP_AVP_INI_RECV_LCP:
                  case L2TP_AVP_LAST_SENT_LCP:
                  case L2TP_AVP_LAST_RECV_LCP:
                  case L2TP_AVP_PROXY_AUTH_CHAL:
                  case L2TP_AVP_PROXY_AUTH_RESP:
                  case L2TP_AVP_RANDOM_VECTOR:
                        print_octets((u_char *)ptr, len-6);
                        break;
                  case L2TP_AVP_Q931_CC:
                        l2tp_q931_cc_print((u_char *)ptr, len-6);
                        break;
                  case L2TP_AVP_CHALLENGE_RESP:
                        print_octets((u_char *)ptr, 16);
                        break;
                  case L2TP_AVP_CALL_SER_NUM:
                  case L2TP_AVP_MINIMUM_BPS:
                  case L2TP_AVP_MAXIMUM_BPS:
                  case L2TP_AVP_TX_CONN_SPEED:
                  case L2TP_AVP_PHY_CHANNEL_ID:
                  case L2TP_AVP_RX_CONN_SPEED:
                        print_32bits_val((u_int32_t *)ptr);
                        break;
                  case L2TP_AVP_BEARER_TYPE:
                        l2tp_bearer_type_print((u_char *)ptr);
                        break;
                  case L2TP_AVP_FRAMING_TYPE:
                        l2tp_framing_type_print((u_char *)ptr);
                        break;
                  case L2TP_AVP_PACKET_PROC_DELAY:
                        l2tp_packet_proc_delay_print();
                        break;
                  case L2TP_AVP_PROXY_AUTH_TYPE:
                        l2tp_proxy_auth_type_print((u_char *)ptr);
                        break;
                  case L2TP_AVP_PROXY_AUTH_ID:
                        l2tp_proxy_auth_id_print((u_char *)ptr);
                        break;
                  case L2TP_AVP_CALL_ERRORS:
                        l2tp_call_errors_print((u_char *)ptr);
                        break;
                  case L2TP_AVP_ACCM:
                        l2tp_accm_print((u_char *)ptr);
                        break;
                  case L2TP_AVP_SEQ_REQUIRED:
                        break;      /* No Attribute Value */
                  case L2TP_AVP_PPP_DISCON_CC:
                        l2tp_ppp_discon_cc_print((u_char *)ptr, len-6);
                        break;
                  default:
                        break;
                  }
            }
            printf(")");
      }

      l2tp_avp_print(dat+len, length-len);
      return;

 trunc:
      printf("|...");
}


void
l2tp_print(const u_char *dat, u_int length)
{
      const u_int16_t *ptr = (u_int16_t *)dat;
      u_int cnt = 0;                /* total octets consumed */
      u_int16_t pad;
      int flag_t, flag_l, flag_s, flag_o, flag_p;
      u_int16_t l2tp_len;

      flag_t = flag_l = flag_s = flag_o = flag_p = FALSE;

      TCHECK(*ptr);     /* Flags & Version */
      if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2TP) {
            printf(" l2tp:");
      } else if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2F) {
            printf(" l2f:");
            return;           /* nothing to do */
      } else {
            printf(" Unknown Version, neither L2F(1) nor L2TP(2)");
            return;           /* nothing we can do */
      }

      printf("[");
      if (EXTRACT_16BITS(ptr) & L2TP_FLAG_TYPE) {
            flag_t = TRUE;
            printf("T");
      }
      if (EXTRACT_16BITS(ptr) & L2TP_FLAG_LENGTH) {
            flag_l = TRUE;
            printf("L");
      }
      if (EXTRACT_16BITS(ptr) & L2TP_FLAG_SEQUENCE) {
            flag_s = TRUE;
            printf("S");
      }
      if (EXTRACT_16BITS(ptr) & L2TP_FLAG_OFFSET) {
            flag_o = TRUE;
            printf("O");
      }
      if (EXTRACT_16BITS(ptr) & L2TP_FLAG_PRIORITY) {
            flag_p = TRUE;
            printf("P");
      }
      printf("]");

      ptr++;
      cnt += 2;

      if (flag_l) {
            TCHECK(*ptr);     /* Length */
            l2tp_len = EXTRACT_16BITS(ptr); ptr++;
            cnt += 2;
      } else {
            l2tp_len = 0;
      }

      TCHECK(*ptr);           /* Tunnel ID */
      printf("(%u/", EXTRACT_16BITS(ptr)); ptr++;
      cnt += 2;
      TCHECK(*ptr);           /* Session ID */
      printf("%u)",  EXTRACT_16BITS(ptr)); ptr++;
      cnt += 2;

      if (flag_s) {
            TCHECK(*ptr);     /* Ns */
            printf("Ns=%u,", EXTRACT_16BITS(ptr)); ptr++;
            cnt += 2;
            TCHECK(*ptr);     /* Nr */
            printf("Nr=%u",  EXTRACT_16BITS(ptr)); ptr++;
            cnt += 2;
      }

      if (flag_o) {
            TCHECK(*ptr);     /* Offset Size */
            pad =  EXTRACT_16BITS(ptr); ptr++;
            ptr += pad / sizeof(*ptr);
            cnt += (2 + pad);
      }

      if (flag_t) {
            if (length - cnt == 0) {
                  printf(" ZLB");
            } else {
                  l2tp_avp_print((u_char *)ptr, length - cnt);
            }
      } else {
            printf(" {");
            ppp_print((u_char *)ptr, length - cnt);
            printf("}");
      }

      return;

 trunc:
      printf("%s", tstr);
}

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