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

 /*
  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
  *	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.
  */

 #ifndef lint
 static const char rcsid[] _U_ =
 	"@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.20 2003-12-15 03:36:05 guy Exp $ (LBL)";
 #endif

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

 #include <tcpdump-stdinc.h>

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

 #include "addrtoname.h"
 #include "interface.h"
 #include "ethertype.h"
 #include "extract.h"

 static void lmi_print(const u_char *, u_int);

 #define NLPID_LMI       0x08   /* ANSI T1.617 Annex D or ITU-T Q.933 Annex A */
 #define NLPID_CISCO_LMI 0x09   /* The original, aka Cisco, aka Gang of Four */
 #define NLPID_SNAP      0x80
 #define NLPID_CLNP      0x81
 #define NLPID_ESIS      0x82
 #define NLPID_ISIS      0x83
 #define NLPID_CONS      0x84
 #define NLPID_IDRP      0x85
 #define NLPID_X25_ESIS  0x8a
 #define NLPID_IPV6      0x8e
 #define NLPID_IP        0xcc

 #define FR_EA_BIT	0x01


 /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success */
 static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *addr_len,
 			   char **flags_ptr)
 {
 	static char flags[32];
 	size_t len;

 	if ((p[0] & FR_EA_BIT))
 		return -1;

 	*flags_ptr = flags;
 	*addr_len = 2;
 	*dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);

 	strcpy(flags, (p[0] & 0x02) ? "C!, " : "");
 	if (p[1] & 0x08)
 		strcat(flags, "FECN, ");
 	if (p[1] & 0x04)
 		strcat(flags, "BECN, ");
 	if (p[1] & 0x02)
 		strcat(flags, "DE, ");

 	len = strlen(flags);
 	if (len > 1)
 		flags[len - 2] = '\x0';	/* delete trailing comma and space */

 	if (p[1] & FR_EA_BIT)
 		return 0;	/* 2-byte Q.922 address */

 	p += 2;
 	(*addr_len)++;		/* 3- or 4-byte Q.922 address */
 	if ((p[0] & FR_EA_BIT) == 0) {
 		*dlci = (*dlci << 7) | (p[0] >> 1);
 		(*addr_len)++;	/* 4-byte Q.922 address */
 		p++;
 	}

 	if ((p[0] & FR_EA_BIT) == 0)
 		return -1; /* more than 4 bytes of Q.922 address? */

 	if (p[0] & 0x02) {
 		len = strlen(flags);
 		snprintf(flags + len, sizeof(flags) - len,
 			 "%sdlcore %x", len ? ", " : "", p[0] >> 2);
 	} else
 		*dlci = (*dlci << 6) | (p[0] >> 2);

 	return 0;
 }


 static const char *fr_nlpids[256];

 static void
 init_fr_nlpids(void)
 {
 	int i;
 	static int fr_nlpid_flag = 0;

 	if (!fr_nlpid_flag) {
 		for (i=0; i < 256; i++)
 			fr_nlpids[i] = NULL;
 		fr_nlpids[NLPID_LMI] = "LMI";
 		fr_nlpids[NLPID_CISCO_LMI] = "Cisco LMI";
 		fr_nlpids[NLPID_SNAP] = "SNAP";
 		fr_nlpids[NLPID_CLNP] = "CLNP";
 		fr_nlpids[NLPID_ESIS] = "ESIS";
 		fr_nlpids[NLPID_ISIS] = "ISIS";
 		fr_nlpids[NLPID_CONS] = "CONS";
 		fr_nlpids[NLPID_IDRP] = "IDRP";
 		fr_nlpids[NLPID_X25_ESIS] = "X25_ESIS";
 		fr_nlpids[NLPID_IP] = "IP";
 	}
 	fr_nlpid_flag = 1;
 }

 /* Frame Relay packet structure, with flags and CRC removed

                   +---------------------------+
                   |       Q.922 Address*      |
                   +--                       --+
                   |                           |
                   +---------------------------+
                   | Control (UI = 0x03)       |
                   +---------------------------+
                   | Optional Pad      (0x00)  |
                   +---------------------------+
                   | NLPID                     |
                   +---------------------------+
                   |             .             |
                   |             .             |
                   |             .             |
                   |           Data            |
                   |             .             |
                   |             .             |
                   +---------------------------+

            * Q.922 addresses, as presently defined, are two octets and
              contain a 10-bit DLCI.  In some networks Q.922 addresses
              may optionally be increased to three or four octets.
 */

 static u_int
 fr_hdrlen(const u_char *p, u_int addr_len, u_int caplen)
 {
 	if ((caplen > addr_len + 1 /* UI */ + 1 /* pad */) &&
 	    !p[addr_len + 1] /* pad exist */)
 		return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
 	else
 		return addr_len + 1 /* UI */ + 1 /* NLPID */;
 }

 static const char *
 fr_protostring(u_int8_t proto)
 {
 	static char buf[5+1+2+1];

 	init_fr_nlpids();

 	if (nflag || fr_nlpids[proto] == NULL) {
 		snprintf(buf, sizeof(buf), "proto %02x", proto);
 		return buf;
 	}
 	return fr_nlpids[proto];
 }

 static void
 fr_hdr_print(int length, u_int dlci, char *flags, u_char nlpid)
 {
 	if (qflag)
 		(void)printf("DLCI %u, %s%slength %d: ",
 			     dlci, flags, *flags ? ", " : "", length);
 	else
 		(void)printf("DLCI %u, %s%s%s, length %d: ",
 			     dlci, flags, *flags ? ", " : "",
 			     fr_protostring(nlpid), length);
 }

 u_int
 fr_if_print(const struct pcap_pkthdr *h, register const u_char *p)
 {
 	register u_int length = h->len;
 	register u_int caplen = h->caplen;
 	u_short extracted_ethertype;
 	u_int32_t orgcode;
 	register u_short et;
 	u_int dlci;
 	int addr_len;
 	u_char nlpid;
 	u_int hdr_len;
 	char *flags;

 	if (caplen < 4) {	/* minimum frame header length */
 		printf("[|fr]");
 		return caplen;
 	}

 	if (parse_q922_addr(p, &dlci, &addr_len, &flags)) {
 		printf("Invalid Q.922 address");
 		return caplen;
 	}

 	hdr_len = fr_hdrlen(p, addr_len, caplen);

 	if (caplen < hdr_len) {
 		printf("[|fr]");
 		return caplen;
 	}

 	if (p[addr_len] != 0x03)
 		printf("UI %02x! ", p[addr_len]);

 	if (!p[addr_len + 1]) {	/* pad byte should be used with 3-byte Q.922 */
 		if (addr_len != 3)
 			printf("Pad! ");
 	} else if (addr_len == 3)
 		printf("No pad! ");

 	nlpid = p[hdr_len - 1];

 	p += hdr_len;
 	length -= hdr_len;
 	caplen -= hdr_len;

 	if (eflag)
 		fr_hdr_print(length, dlci, flags, nlpid);

 	switch (nlpid) {
 	case NLPID_IP:
 		ip_print(p, length);
 		break;

 #ifdef INET6
 	case NLPID_IPV6:
 		ip6_print(p, length);
 		break;
 #endif
 	case NLPID_CLNP:
 	case NLPID_ESIS:
 	case NLPID_ISIS:
 		isoclns_print(p, length, caplen);
 		break;

 	case NLPID_SNAP:
 		orgcode = EXTRACT_24BITS(p);
 		et = EXTRACT_16BITS(p + 3);
 		if (snap_print((const u_char *)(p + 5), length - 5,
 			   caplen - 5, &extracted_ethertype, orgcode, et,
 			   0) == 0) {
 			/* ether_type not known, print raw packet */
 			if (!eflag)
 				fr_hdr_print(length + hdr_len,
 					     dlci, flags, nlpid);
 			if (extracted_ethertype) {
 				printf("(SNAP %s) ",
 			       etherproto_string(htons(extracted_ethertype)));
 			}
 			if (!xflag && !qflag)
 				default_print(p - hdr_len, caplen + hdr_len);
 		}
 		break;

 	case NLPID_LMI:
 		lmi_print(p, length);
 		break;

 	default:
 		if (!eflag)
 			fr_hdr_print(length + hdr_len,
 				     dlci, flags, nlpid);
 		if (!xflag)
 			default_print(p, caplen);
 	}

 	return hdr_len;
 }

 /*
  * Q.933 decoding portion for framerelay specific.
  */

 /* Q.933 packet format
                       Format of Other Protocols
                           using Q.933 NLPID
                   +-------------------------------+
                   |        Q.922 Address          |
                   +---------------+---------------+
                   |Control  0x03  | NLPID   0x08  |
                   +---------------+---------------+
                   |          L2 Protocol ID       |
                   | octet 1       |  octet 2      |
                   +-------------------------------+
                   |          L3 Protocol ID       |
                   | octet 2       |  octet 2      |
                   +-------------------------------+
                   |         Protocol Data         |
                   +-------------------------------+
                   | FCS                           |
                   +-------------------------------+
  */

 /* L2 (Octet 1)- Call Reference Usually is 0x0 */

 /*
  * L2 (Octet 2)- Message Types definition 1 byte long.
  */
 /* Call Establish */
 #define MSG_TYPE_ESC_TO_NATIONAL  0x00
 #define MSG_TYPE_ALERT            0x01
 #define MSG_TYPE_CALL_PROCEEDING  0x02
 #define MSG_TYPE_CONNECT          0x07
 #define MSG_TYPE_CONNECT_ACK      0x0F
 #define MSG_TYPE_PROGRESS         0x03
 #define MSG_TYPE_SETUP            0x05
 /* Call Clear */
 #define MSG_TYPE_DISCONNECT       0x45
 #define MSG_TYPE_RELEASE          0x4D
 #define MSG_TYPE_RELEASE_COMPLETE 0x5A
 #define MSG_TYPE_RESTART          0x46
 #define MSG_TYPE_RESTART_ACK      0x4E
 /* Status */
 #define MSG_TYPE_STATUS           0x7D
 #define MSG_TYPE_STATUS_ENQ       0x75

 #define MSG_ANSI_LOCKING_SHIFT	0x95
 #define ONE_BYTE_IE_MASK	0xF0 /* details? */

 #define ANSI_REPORT_TYPE_IE	0x01
 #define ANSI_LINK_VERIFY_IE_91	0x19 /* details? */
 #define ANSI_LINK_VERIFY_IE	0x03
 #define ANSI_PVC_STATUS_IE	0x07

 #define CCITT_REPORT_TYPE_IE	0x51
 #define CCITT_LINK_VERIFY_IE	0x53
 #define CCITT_PVC_STATUS_IE	0x57

 struct common_ie_header {
     u_int8_t ie_id;
     u_int8_t ie_len;
 };

 #define FULL_STATUS 0
 #define LINK_VERIFY 1
 #define ASYNC_PVC   2


 /* Parses DLCI information element. */
 static const char * parse_dlci_ie(const u_char *p, u_int ie_len, char *buffer,
 			    size_t buffer_len)
 {
 	u_int dlci;

 	if ((ie_len < 3) ||
 	    (p[0] & 0x80) ||
 	    ((ie_len == 3) && !(p[1] & 0x80)) ||
 	    ((ie_len == 4) && ((p[1] & 0x80) || !(p[2] & 0x80))) ||
 	    ((ie_len == 5) && ((p[1] & 0x80) || (p[2] & 0x80) ||
 			       !(p[3] & 0x80))) ||
 	    (ie_len > 5) ||
 	    !(p[ie_len - 1] & 0x80))
 		return "Invalid DLCI IE";

 	dlci = ((p[0] & 0x3F) << 4) | ((p[1] & 0x78) >> 3);
 	if (ie_len == 4)
 		dlci = (dlci << 6) | ((p[2] & 0x7E) >> 1);
 	else if (ie_len == 5)
 		dlci = (dlci << 13) | (p[2] & 0x7F) | ((p[3] & 0x7E) >> 1);

 	snprintf(buffer, buffer_len, "DLCI %d: status %s%s", dlci,
 		 p[ie_len - 1] & 0x8 ? "New, " : "",
 		 p[ie_len - 1] & 0x2 ? "Active" : "Inactive");

 	return buffer;
 }


 static void
 lmi_print(const u_char *p, u_int length)
 {
 	const u_char *ptemp = p;
 	const char *decode_str;
 	char temp_str[255];
 	struct common_ie_header *ie_p;
 	int is_ansi = 0;

 	if (length < 9) {	/* shortest: Q.933a LINK VERIFY */
 		printf("[|lmi]");
 		return;
 	}

 	if (p[2] == MSG_ANSI_LOCKING_SHIFT)
 		is_ansi = 1;

 	/* printing out header part */
 	printf(is_ansi ? "ANSI" : "CCITT");
 	if (p[0])
 		printf(" Call Ref: %02x!", p[0]);

 	switch(p[1]) {

 	case MSG_TYPE_STATUS:
 		printf(" STATUS REPLY\n");
 		break;

 	case MSG_TYPE_STATUS_ENQ:
 		printf(" STATUS ENQUIRY\n");
 		break;

 	default:
 		printf(" UNKNOWN MSG Type %02x\n", p[1]);
 		break;
 	}

 	if (length < (u_int)(2 - is_ansi)) {
 		printf("[|lmi]");
 		return;
 	}
 	length -= 2 - is_ansi;
 	ptemp += 2 + is_ansi;

 	/* Loop through the rest of IE */
 	while (length > 0) {
 		ie_p = (struct common_ie_header *)ptemp;
 		if (length < sizeof(struct common_ie_header) ||
 		    length < sizeof(struct common_ie_header) + ie_p->ie_len) {
 			printf("[|lmi]");
 			return;
 		}

 		if ((is_ansi && ie_p->ie_id == ANSI_REPORT_TYPE_IE) ||
 		    (!is_ansi && ie_p->ie_id == CCITT_REPORT_TYPE_IE)) {
 			switch(ptemp[2]) {

 			case FULL_STATUS:
 				decode_str = "FULL STATUS";
 				break;

 			case LINK_VERIFY:
 				decode_str = "LINK VERIFY";
 				break;

 			case ASYNC_PVC:
 				decode_str = "Async PVC Status";
 				break;

 			default:
 				decode_str = "Reserved Value";
 				break;
 			}
 		} else if ((is_ansi && (ie_p->ie_id == ANSI_LINK_VERIFY_IE_91 ||
 				        ie_p->ie_id == ANSI_LINK_VERIFY_IE)) ||
 			  (!is_ansi && ie_p->ie_id == CCITT_LINK_VERIFY_IE)) {
 			snprintf(temp_str, sizeof(temp_str),
 			     "TX Seq: %3d, RX Seq: %3d",
 			     ptemp[2], ptemp[3]);
 			decode_str = temp_str;
 		} else if ((is_ansi && ie_p->ie_id == ANSI_PVC_STATUS_IE) ||
 			   (!is_ansi && ie_p->ie_id == CCITT_PVC_STATUS_IE)) {
 			decode_str = parse_dlci_ie(ptemp + 2, ie_p->ie_len,
 						   temp_str, sizeof(temp_str));
 		} else
 			decode_str = "Non-decoded Value";

 		printf("\t\tIE: %02X Len: %d, %s\n",
 		       ie_p->ie_id, ie_p->ie_len, decode_str);
 		length = length - ie_p->ie_len - 2;
 		ptemp = ptemp + ie_p->ie_len + 2;
 	}
 }
	/*
	* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
	* 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.
	*/

	#ifndef lint
	static const char rcsid[] _U_ =
	"@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.20 2003-12-15 03:36:05 guy Exp $ (LBL)";
	#endif

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

	#include <tcpdump-stdinc.h>

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

	#include "addrtoname.h"
	#include "interface.h"
	#include "ethertype.h"
	#include "extract.h"

	static void lmi_print(const u_char *, u_int);

	#define NLPID_LMI 0x08 /* ANSI T1.617 Annex D or ITU-T Q.933 Annex A */
	#define NLPID_CISCO_LMI 0x09 /* The original, aka Cisco, aka Gang of Four */
	#define NLPID_SNAP 0x80
	#define NLPID_CLNP 0x81
	#define NLPID_ESIS 0x82
	#define NLPID_ISIS 0x83
	#define NLPID_CONS 0x84
	#define NLPID_IDRP 0x85
	#define NLPID_X25_ESIS 0x8a
	#define NLPID_IPV6 0x8e
	#define NLPID_IP 0xcc

	#define FR_EA_BIT 0x01


	/* Finds out Q.922 address length, DLCI and flags. Returns 0 on success */
	static int parse_q922_addr(const u_char p, u_int dlci, u_int *addr_len,
	char **flags_ptr)
	{
	static char flags[32];
	size_t len;

	if ((p[0] & FR_EA_BIT))
	return -1;

	*flags_ptr = flags;
	*addr_len = 2;
	*dlci = ((p[0] & 0xFC) << 2) \| ((p[1] & 0xF0) >> 4);

	strcpy(flags, (p[0] & 0x02) ? "C!, " : "");
	if (p[1] & 0x08)
	strcat(flags, "FECN, ");
	if (p[1] & 0x04)
	strcat(flags, "BECN, ");
	if (p[1] & 0x02)
	strcat(flags, "DE, ");

	len = strlen(flags);
	if (len > 1)
	flags[len - 2] = '\x0'; /* delete trailing comma and space */

	if (p[1] & FR_EA_BIT)
	return 0; /* 2-byte Q.922 address */

	p += 2;
	(addr_len)++; / 3- or 4-byte Q.922 address */
	if ((p[0] & FR_EA_BIT) == 0) {
	dlci = (dlci << 7) \| (p[0] >> 1);
	(addr_len)++; / 4-byte Q.922 address */
	p++;
	}

	if ((p[0] & FR_EA_BIT) == 0)
	return -1; /* more than 4 bytes of Q.922 address? */

	if (p[0] & 0x02) {
	len = strlen(flags);
	snprintf(flags + len, sizeof(flags) - len,
	"%sdlcore %x", len ? ", " : "", p[0] >> 2);
	} else
	dlci = (dlci << 6) \| (p[0] >> 2);

	return 0;
	}


	static const char *fr_nlpids[256];

	static void
	init_fr_nlpids(void)
	{
	int i;
	static int fr_nlpid_flag = 0;

	if (!fr_nlpid_flag) {
	for (i=0; i < 256; i++)
	fr_nlpids[i] = NULL;
	fr_nlpids[NLPID_LMI] = "LMI";
	fr_nlpids[NLPID_CISCO_LMI] = "Cisco LMI";
	fr_nlpids[NLPID_SNAP] = "SNAP";
	fr_nlpids[NLPID_CLNP] = "CLNP";
	fr_nlpids[NLPID_ESIS] = "ESIS";
	fr_nlpids[NLPID_ISIS] = "ISIS";
	fr_nlpids[NLPID_CONS] = "CONS";
	fr_nlpids[NLPID_IDRP] = "IDRP";
	fr_nlpids[NLPID_X25_ESIS] = "X25_ESIS";
	fr_nlpids[NLPID_IP] = "IP";
	}
	fr_nlpid_flag = 1;
	}

	/* Frame Relay packet structure, with flags and CRC removed

	+---------------------------+
	\| Q.922 Address* \|
	+-- --+
	\| \|
	+---------------------------+
	\| Control (UI = 0x03) \|
	+---------------------------+
	\| Optional Pad (0x00) \|
	+---------------------------+
	\| NLPID \|
	+---------------------------+
	\| . \|
	\| . \|
	\| . \|
	\| Data \|
	\| . \|
	\| . \|
	+---------------------------+

	* Q.922 addresses, as presently defined, are two octets and
	contain a 10-bit DLCI. In some networks Q.922 addresses
	may optionally be increased to three or four octets.
	*/

	static u_int
	fr_hdrlen(const u_char *p, u_int addr_len, u_int caplen)
	{
	if ((caplen > addr_len + 1 /* UI / + 1 / pad */) &&
	!p[addr_len + 1] /* pad exist */)
	return addr_len + 1 /* UI / + 1 / pad / + 1 / NLPID */;
	else
	return addr_len + 1 /* UI / + 1 / NLPID */;
	}

	static const char *
	fr_protostring(u_int8_t proto)
	{
	static char buf[5+1+2+1];

	init_fr_nlpids();

	if (nflag \|\| fr_nlpids[proto] == NULL) {
	snprintf(buf, sizeof(buf), "proto %02x", proto);
	return buf;
	}
	return fr_nlpids[proto];
	}

	static void
	fr_hdr_print(int length, u_int dlci, char *flags, u_char nlpid)
	{
	if (qflag)
	(void)printf("DLCI %u, %s%slength %d: ",
	dlci, flags, *flags ? ", " : "", length);
	else
	(void)printf("DLCI %u, %s%s%s, length %d: ",
	dlci, flags, *flags ? ", " : "",
	fr_protostring(nlpid), length);
	}

	u_int
	fr_if_print(const struct pcap_pkthdr h, register const u_char p)
	{
	register u_int length = h->len;
	register u_int caplen = h->caplen;
	u_short extracted_ethertype;
	u_int32_t orgcode;
	register u_short et;
	u_int dlci;
	int addr_len;
	u_char nlpid;
	u_int hdr_len;
	char *flags;

	if (caplen < 4) { /* minimum frame header length */
	printf("[\|fr]");
	return caplen;
	}

	if (parse_q922_addr(p, &dlci, &addr_len, &flags)) {
	printf("Invalid Q.922 address");
	return caplen;
	}

	hdr_len = fr_hdrlen(p, addr_len, caplen);

	if (caplen < hdr_len) {
	printf("[\|fr]");
	return caplen;
	}

	if (p[addr_len] != 0x03)
	printf("UI %02x! ", p[addr_len]);

	if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
	if (addr_len != 3)
	printf("Pad! ");
	} else if (addr_len == 3)
	printf("No pad! ");

	nlpid = p[hdr_len - 1];

	p += hdr_len;
	length -= hdr_len;
	caplen -= hdr_len;

	if (eflag)
	fr_hdr_print(length, dlci, flags, nlpid);

	switch (nlpid) {
	case NLPID_IP:
	ip_print(p, length);
	break;

	#ifdef INET6
	case NLPID_IPV6:
	ip6_print(p, length);
	break;
	#endif
	case NLPID_CLNP:
	case NLPID_ESIS:
	case NLPID_ISIS:
	isoclns_print(p, length, caplen);
	break;

	case NLPID_SNAP:
	orgcode = EXTRACT_24BITS(p);
	et = EXTRACT_16BITS(p + 3);
	if (snap_print((const u_char *)(p + 5), length - 5,
	caplen - 5, &extracted_ethertype, orgcode, et,
	0) == 0) {
	/* ether_type not known, print raw packet */
	if (!eflag)
	fr_hdr_print(length + hdr_len,
	dlci, flags, nlpid);
	if (extracted_ethertype) {
	printf("(SNAP %s) ",
	etherproto_string(htons(extracted_ethertype)));
	}
	if (!xflag && !qflag)
	default_print(p - hdr_len, caplen + hdr_len);
	}
	break;

	case NLPID_LMI:
	lmi_print(p, length);
	break;

	default:
	if (!eflag)
	fr_hdr_print(length + hdr_len,
	dlci, flags, nlpid);
	if (!xflag)
	default_print(p, caplen);
	}

	return hdr_len;
	}

	/*
	* Q.933 decoding portion for framerelay specific.
	*/

	/* Q.933 packet format
	Format of Other Protocols
	using Q.933 NLPID
	+-------------------------------+
	\| Q.922 Address \|
	+---------------+---------------+
	\|Control 0x03 \| NLPID 0x08 \|
	+---------------+---------------+
	\| L2 Protocol ID \|
	\| octet 1 \| octet 2 \|
	+-------------------------------+
	\| L3 Protocol ID \|
	\| octet 2 \| octet 2 \|
	+-------------------------------+
	\| Protocol Data \|
	+-------------------------------+
	\| FCS \|
	+-------------------------------+
	*/

	/* L2 (Octet 1)- Call Reference Usually is 0x0 */

	/*
	* L2 (Octet 2)- Message Types definition 1 byte long.
	*/
	/* Call Establish */
	#define MSG_TYPE_ESC_TO_NATIONAL 0x00
	#define MSG_TYPE_ALERT 0x01
	#define MSG_TYPE_CALL_PROCEEDING 0x02
	#define MSG_TYPE_CONNECT 0x07
	#define MSG_TYPE_CONNECT_ACK 0x0F
	#define MSG_TYPE_PROGRESS 0x03
	#define MSG_TYPE_SETUP 0x05
	/* Call Clear */
	#define MSG_TYPE_DISCONNECT 0x45
	#define MSG_TYPE_RELEASE 0x4D
	#define MSG_TYPE_RELEASE_COMPLETE 0x5A
	#define MSG_TYPE_RESTART 0x46
	#define MSG_TYPE_RESTART_ACK 0x4E
	/* Status */
	#define MSG_TYPE_STATUS 0x7D
	#define MSG_TYPE_STATUS_ENQ 0x75

	#define MSG_ANSI_LOCKING_SHIFT 0x95
	#define ONE_BYTE_IE_MASK 0xF0 /* details? */

	#define ANSI_REPORT_TYPE_IE 0x01
	#define ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
	#define ANSI_LINK_VERIFY_IE 0x03
	#define ANSI_PVC_STATUS_IE 0x07

	#define CCITT_REPORT_TYPE_IE 0x51
	#define CCITT_LINK_VERIFY_IE 0x53
	#define CCITT_PVC_STATUS_IE 0x57

	struct common_ie_header {
	u_int8_t ie_id;
	u_int8_t ie_len;
	};

	#define FULL_STATUS 0
	#define LINK_VERIFY 1
	#define ASYNC_PVC 2


	/* Parses DLCI information element. */
	static const char * parse_dlci_ie(const u_char p, u_int ie_len, char buffer,
	size_t buffer_len)
	{
	u_int dlci;

	if ((ie_len < 3) \|\|
	(p[0] & 0x80) \|\|
	((ie_len == 3) && !(p[1] & 0x80)) \|\|
	((ie_len == 4) && ((p[1] & 0x80) \|\| !(p[2] & 0x80))) \|\|
	((ie_len == 5) && ((p[1] & 0x80) \|\| (p[2] & 0x80) \|\|
	!(p[3] & 0x80))) \|\|
	(ie_len > 5) \|\|
	!(p[ie_len - 1] & 0x80))
	return "Invalid DLCI IE";

	dlci = ((p[0] & 0x3F) << 4) \| ((p[1] & 0x78) >> 3);
	if (ie_len == 4)
	dlci = (dlci << 6) \| ((p[2] & 0x7E) >> 1);
	else if (ie_len == 5)
	dlci = (dlci << 13) \| (p[2] & 0x7F) \| ((p[3] & 0x7E) >> 1);

	snprintf(buffer, buffer_len, "DLCI %d: status %s%s", dlci,
	p[ie_len - 1] & 0x8 ? "New, " : "",
	p[ie_len - 1] & 0x2 ? "Active" : "Inactive");

	return buffer;
	}


	static void
	lmi_print(const u_char *p, u_int length)
	{
	const u_char *ptemp = p;
	const char *decode_str;
	char temp_str[255];
	struct common_ie_header *ie_p;
	int is_ansi = 0;

	if (length < 9) { /* shortest: Q.933a LINK VERIFY */
	printf("[\|lmi]");
	return;
	}

	if (p[2] == MSG_ANSI_LOCKING_SHIFT)
	is_ansi = 1;

	/* printing out header part */
	printf(is_ansi ? "ANSI" : "CCITT");
	if (p[0])
	printf(" Call Ref: %02x!", p[0]);

	switch(p[1]) {

	case MSG_TYPE_STATUS:
	printf(" STATUS REPLY\n");
	break;

	case MSG_TYPE_STATUS_ENQ:
	printf(" STATUS ENQUIRY\n");
	break;

	default:
	printf(" UNKNOWN MSG Type %02x\n", p[1]);
	break;
	}

	if (length < (u_int)(2 - is_ansi)) {
	printf("[\|lmi]");
	return;
	}
	length -= 2 - is_ansi;
	ptemp += 2 + is_ansi;

	/* Loop through the rest of IE */
	while (length > 0) {
	ie_p = (struct common_ie_header *)ptemp;
	if (length < sizeof(struct common_ie_header) \|\|
	length < sizeof(struct common_ie_header) + ie_p->ie_len) {
	printf("[\|lmi]");
	return;
	}

	if ((is_ansi && ie_p->ie_id == ANSI_REPORT_TYPE_IE) \|\|
	(!is_ansi && ie_p->ie_id == CCITT_REPORT_TYPE_IE)) {
	switch(ptemp[2]) {

	case FULL_STATUS:
	decode_str = "FULL STATUS";
	break;

	case LINK_VERIFY:
	decode_str = "LINK VERIFY";
	break;

	case ASYNC_PVC:
	decode_str = "Async PVC Status";
	break;

	default:
	decode_str = "Reserved Value";
	break;
	}
	} else if ((is_ansi && (ie_p->ie_id == ANSI_LINK_VERIFY_IE_91 \|\|
	ie_p->ie_id == ANSI_LINK_VERIFY_IE)) \|\|
	(!is_ansi && ie_p->ie_id == CCITT_LINK_VERIFY_IE)) {
	snprintf(temp_str, sizeof(temp_str),
	"TX Seq: %3d, RX Seq: %3d",
	ptemp[2], ptemp[3]);
	decode_str = temp_str;
	} else if ((is_ansi && ie_p->ie_id == ANSI_PVC_STATUS_IE) \|\|
	(!is_ansi && ie_p->ie_id == CCITT_PVC_STATUS_IE)) {
	decode_str = parse_dlci_ie(ptemp + 2, ie_p->ie_len,
	temp_str, sizeof(temp_str));
	} else
	decode_str = "Non-decoded Value";

	printf("\t\tIE: %02X Len: %d, %s\n",
	ie_p->ie_id, ie_p->ie_len, decode_str);
	length = length - ie_p->ie_len - 2;
	ptemp = ptemp + ie_p->ie_len + 2;
	}
	}