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

 /*
  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
  *	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: Ethernet printer */

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

 #include <netdissect-stdinc.h>

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

 const struct tok ethertype_values[] = {
     { ETHERTYPE_IP,		"IPv4" },
     { ETHERTYPE_MPLS,		"MPLS unicast" },
     { ETHERTYPE_MPLS_MULTI,	"MPLS multicast" },
     { ETHERTYPE_IPV6,		"IPv6" },
     { ETHERTYPE_8021Q,		"802.1Q" },
     { ETHERTYPE_8021Q9100,	"802.1Q-9100" },
     { ETHERTYPE_8021QinQ,	"802.1Q-QinQ" },
     { ETHERTYPE_8021Q9200,	"802.1Q-9200" },
     { ETHERTYPE_VMAN,		"VMAN" },
     { ETHERTYPE_PUP,            "PUP" },
     { ETHERTYPE_ARP,            "ARP"},
     { ETHERTYPE_REVARP,         "Reverse ARP"},
     { ETHERTYPE_NS,             "NS" },
     { ETHERTYPE_SPRITE,         "Sprite" },
     { ETHERTYPE_TRAIL,          "Trail" },
     { ETHERTYPE_MOPDL,          "MOP DL" },
     { ETHERTYPE_MOPRC,          "MOP RC" },
     { ETHERTYPE_DN,             "DN" },
     { ETHERTYPE_LAT,            "LAT" },
     { ETHERTYPE_SCA,            "SCA" },
     { ETHERTYPE_TEB,            "TEB" },
     { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
     { ETHERTYPE_DECDNS,         "DEC DNS" },
     { ETHERTYPE_DECDTS,         "DEC DTS" },
     { ETHERTYPE_VEXP,           "VEXP" },
     { ETHERTYPE_VPROD,          "VPROD" },
     { ETHERTYPE_ATALK,          "Appletalk" },
     { ETHERTYPE_AARP,           "Appletalk ARP" },
     { ETHERTYPE_IPX,            "IPX" },
     { ETHERTYPE_PPP,            "PPP" },
     { ETHERTYPE_MPCP,           "MPCP" },
     { ETHERTYPE_SLOW,           "Slow Protocols" },
     { ETHERTYPE_PPPOED,         "PPPoE D" },
     { ETHERTYPE_PPPOES,         "PPPoE S" },
     { ETHERTYPE_EAPOL,          "EAPOL" },
     { ETHERTYPE_RRCP,           "RRCP" },
     { ETHERTYPE_MS_NLB_HB,      "MS NLB heartbeat" },
     { ETHERTYPE_JUMBO,          "Jumbo" },
     { ETHERTYPE_LOOPBACK,       "Loopback" },
     { ETHERTYPE_ISO,            "OSI" },
     { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
     { ETHERTYPE_CFM_OLD,        "CFM (old)" },
     { ETHERTYPE_CFM,            "CFM" },
     { ETHERTYPE_IEEE1905_1,     "IEEE1905.1" },
     { ETHERTYPE_LLDP,           "LLDP" },
     { ETHERTYPE_TIPC,           "TIPC"},
     { ETHERTYPE_GEONET_OLD,     "GeoNet (old)"},
     { ETHERTYPE_GEONET,         "GeoNet"},
     { ETHERTYPE_CALM_FAST,      "CALM FAST"},
     { ETHERTYPE_AOE,            "AoE" },
     { ETHERTYPE_MEDSA,          "MEDSA" },
     { 0, NULL}
 };

 static inline void
 ether_hdr_print(netdissect_options *ndo,
                 const u_char *bp, u_int length)
 {
 	register const struct ether_header *ep;
 	uint16_t length_type;

 	ep = (const struct ether_header *)bp;

 	ND_PRINT((ndo, "%s > %s",
 		     etheraddr_string(ndo, ESRC(ep)),
 		     etheraddr_string(ndo, EDST(ep))));

 	length_type = EXTRACT_16BITS(&ep->ether_length_type);
 	if (!ndo->ndo_qflag) {
 	        if (length_type <= ETHERMTU) {
 		        ND_PRINT((ndo, ", 802.3"));
 			length = length_type;
 		} else
 		        ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 				       tok2str(ethertype_values,"Unknown", length_type),
                                        length_type));
         } else {
                 if (length_type <= ETHERMTU) {
                         ND_PRINT((ndo, ", 802.3"));
 			length = length_type;
 		} else
                         ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", length_type)));
         }

 	ND_PRINT((ndo, ", length %u: ", length));
 }

 /*
  * Print an Ethernet frame.
  * This might be encapsulated within another frame; we might be passed
  * a pointer to a function that can print header information for that
  * frame's protocol, and an argument to pass to that function.
  *
  * FIXME: caplen can and should be derived from ndo->ndo_snapend and p.
  */
 u_int
 ether_print(netdissect_options *ndo,
             const u_char *p, u_int length, u_int caplen,
             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 {
 	const struct ether_header *ep;
 	u_int orig_length;
 	u_short length_type;
 	u_int hdrlen;
 	int llc_hdrlen;
 	struct lladdr_info src, dst;

 	if (caplen < ETHER_HDRLEN) {
 		ND_PRINT((ndo, "[|ether]"));
 		return (caplen);
 	}
 	if (length < ETHER_HDRLEN) {
 		ND_PRINT((ndo, "[|ether]"));
 		return (length);
 	}

 	if (ndo->ndo_eflag) {
 		if (print_encap_header != NULL)
 			(*print_encap_header)(ndo, encap_header_arg);
 		ether_hdr_print(ndo, p, length);
 	}
 	orig_length = length;

 	length -= ETHER_HDRLEN;
 	caplen -= ETHER_HDRLEN;
 	ep = (const struct ether_header *)p;
 	p += ETHER_HDRLEN;
 	hdrlen = ETHER_HDRLEN;

 	src.addr = ESRC(ep);
 	src.addr_string = etheraddr_string;
 	dst.addr = EDST(ep);
 	dst.addr_string = etheraddr_string;
 	length_type = EXTRACT_16BITS(&ep->ether_length_type);

 recurse:
 	/*
 	 * Is it (gag) an 802.3 encapsulation?
 	 */
 	if (length_type <= ETHERMTU) {
 		/* Try to print the LLC-layer header & higher layers */
 		llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
 		if (llc_hdrlen < 0) {
 			/* packet type not known, print raw packet */
 			if (!ndo->ndo_suppress_default_print)
 				ND_DEFAULTPRINT(p, caplen);
 			llc_hdrlen = -llc_hdrlen;
 		}
 		hdrlen += llc_hdrlen;
 	} else if (length_type == ETHERTYPE_8021Q  ||
                 length_type == ETHERTYPE_8021Q9100 ||
                 length_type == ETHERTYPE_8021Q9200 ||
                 length_type == ETHERTYPE_8021QinQ) {
 		/*
 		 * Print VLAN information, and then go back and process
 		 * the enclosed type field.
 		 */
 		if (caplen < 4) {
 			ND_PRINT((ndo, "[|vlan]"));
 			return (hdrlen + caplen);
 		}
 		if (length < 4) {
 			ND_PRINT((ndo, "[|vlan]"));
 			return (hdrlen + length);
 		}
 	        if (ndo->ndo_eflag) {
 			uint16_t tag = EXTRACT_16BITS(p);

 			ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
 		}

 		length_type = EXTRACT_16BITS(p + 2);
 		if (ndo->ndo_eflag && length_type > ETHERMTU)
 			ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", length_type)));
 		p += 4;
 		length -= 4;
 		caplen -= 4;
 		hdrlen += 4;
 		goto recurse;
 	} else if (length_type == ETHERTYPE_JUMBO) {
 		/*
 		 * Alteon jumbo frames.
 		 * See
 		 *
 		 *	http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 		 *
 		 * which indicates that, following the type field,
 		 * there's an LLC header and payload.
 		 */
 		/* Try to print the LLC-layer header & higher layers */
 		llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
 		if (llc_hdrlen < 0) {
 			/* packet type not known, print raw packet */
 			if (!ndo->ndo_suppress_default_print)
 				ND_DEFAULTPRINT(p, caplen);
 			llc_hdrlen = -llc_hdrlen;
 		}
 		hdrlen += llc_hdrlen;
 	} else {
 		if (ethertype_print(ndo, length_type, p, length, caplen, &src, &dst) == 0) {
 			/* type not known, print raw packet */
 			if (!ndo->ndo_eflag) {
 				if (print_encap_header != NULL)
 					(*print_encap_header)(ndo, encap_header_arg);
 				ether_hdr_print(ndo, (const u_char *)ep, orig_length);
 			}

 			if (!ndo->ndo_suppress_default_print)
 				ND_DEFAULTPRINT(p, caplen);
 		}
 	}
 	return (hdrlen);
 }

 /*
  * This is the top level routine of the printer.  'p' points
  * to the ether header of the packet, 'h->len' is the length
  * of the packet off the wire, and 'h->caplen' is the number
  * of bytes actually captured.
  */
 u_int
 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
                const u_char *p)
 {
 	return (ether_print(ndo, p, h->len, h->caplen, NULL, NULL));
 }

 /*
  * This is the top level routine of the printer.  'p' points
  * to the ether header of the packet, 'h->len' is the length
  * of the packet off the wire, and 'h->caplen' is the number
  * of bytes actually captured.
  *
  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
  * before the Ethernet header.
  */
 u_int
 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
                      const u_char *p)
 {
 	/*
 	 * Fail if we don't have enough data for the Hilscher pseudo-header.
 	 */
 	if (h->len < 4 || h->caplen < 4) {
 		ND_PRINT((ndo, "[|netanalyzer]"));
 		return (h->caplen);
 	}

 	/* Skip the pseudo-header. */
 	return (4 + ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL));
 }

 /*
  * This is the top level routine of the printer.  'p' points
  * to the ether header of the packet, 'h->len' is the length
  * of the packet off the wire, and 'h->caplen' is the number
  * of bytes actually captured.
  *
  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
  * before the Ethernet header.
  */
 u_int
 netanalyzer_transparent_if_print(netdissect_options *ndo,
                                  const struct pcap_pkthdr *h,
                                  const u_char *p)
 {
 	/*
 	 * Fail if we don't have enough data for the Hilscher pseudo-header,
 	 * preamble, and SOF.
 	 */
 	if (h->len < 12 || h->caplen < 12) {
 		ND_PRINT((ndo, "[|netanalyzer-transparent]"));
 		return (h->caplen);
 	}

 	/* Skip the pseudo-header, preamble, and SOF. */
 	return (12 + ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL));
 }

 /*
  * Prints the packet payload, given an Ethernet type code for the payload's
  * protocol.
  *
  * Returns non-zero if it can do so, zero if the ethertype is unknown.
  */

 int
 ethertype_print(netdissect_options *ndo,
                 u_short ether_type, const u_char *p,
                 u_int length, u_int caplen,
                 const struct lladdr_info *src, const struct lladdr_info *dst)
 {
 	switch (ether_type) {

 	case ETHERTYPE_IP:
 	        ip_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_IPV6:
 		ip6_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_ARP:
 	case ETHERTYPE_REVARP:
 	        arp_print(ndo, p, length, caplen);
 		return (1);

 	case ETHERTYPE_DN:
 		decnet_print(ndo, p, length, caplen);
 		return (1);

 	case ETHERTYPE_ATALK:
 		if (ndo->ndo_vflag)
 			ND_PRINT((ndo, "et1 "));
 		atalk_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_AARP:
 		aarp_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_IPX:
 		ND_PRINT((ndo, "(NOV-ETHII) "));
 		ipx_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_ISO:
 		if (length == 0 || caplen == 0) {
 			ND_PRINT((ndo, " [|osi]"));
 			return (1);
 		}
 		isoclns_print(ndo, p + 1, length - 1);
 		return(1);

 	case ETHERTYPE_PPPOED:
 	case ETHERTYPE_PPPOES:
 	case ETHERTYPE_PPPOED2:
 	case ETHERTYPE_PPPOES2:
 		pppoe_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_EAPOL:
 	        eap_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_RRCP:
 	        rrcp_print(ndo, p, length, src, dst);
 		return (1);

 	case ETHERTYPE_PPP:
 		if (length) {
 			ND_PRINT((ndo, ": "));
 			ppp_print(ndo, p, length);
 		}
 		return (1);

 	case ETHERTYPE_MPCP:
 	        mpcp_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_SLOW:
 	        slow_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_CFM:
 	case ETHERTYPE_CFM_OLD:
 		cfm_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_LLDP:
 		lldp_print(ndo, p, length);
 		return (1);

         case ETHERTYPE_LOOPBACK:
 		loopback_print(ndo, p, length);
                 return (1);

 	case ETHERTYPE_MPLS:
 	case ETHERTYPE_MPLS_MULTI:
 		mpls_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_TIPC:
 		tipc_print(ndo, p, length, caplen);
 		return (1);

 	case ETHERTYPE_MS_NLB_HB:
 		msnlb_print(ndo, p);
 		return (1);

         case ETHERTYPE_GEONET_OLD:
         case ETHERTYPE_GEONET:
                 geonet_print(ndo, p, length, src);
                 return (1);

         case ETHERTYPE_CALM_FAST:
                 calm_fast_print(ndo, p, length, src);
                 return (1);

 	case ETHERTYPE_AOE:
 		aoe_print(ndo, p, length);
 		return (1);

 	case ETHERTYPE_MEDSA:
 		medsa_print(ndo, p, length, caplen, src, dst);
 		return (1);

 	case ETHERTYPE_LAT:
 	case ETHERTYPE_SCA:
 	case ETHERTYPE_MOPRC:
 	case ETHERTYPE_MOPDL:
 	case ETHERTYPE_IEEE1905_1:
 		/* default_print for now */
 	default:
 		return (0);
 	}
 }


 /*
  * Local Variables:
  * c-style: whitesmith
  * c-basic-offset: 8
  * End:
  */
	/*
	* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
	* 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: Ethernet printer */

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

	#include <netdissect-stdinc.h>

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

	const struct tok ethertype_values[] = {
	{ ETHERTYPE_IP, "IPv4" },
	{ ETHERTYPE_MPLS, "MPLS unicast" },
	{ ETHERTYPE_MPLS_MULTI, "MPLS multicast" },
	{ ETHERTYPE_IPV6, "IPv6" },
	{ ETHERTYPE_8021Q, "802.1Q" },
	{ ETHERTYPE_8021Q9100, "802.1Q-9100" },
	{ ETHERTYPE_8021QinQ, "802.1Q-QinQ" },
	{ ETHERTYPE_8021Q9200, "802.1Q-9200" },
	{ ETHERTYPE_VMAN, "VMAN" },
	{ ETHERTYPE_PUP, "PUP" },
	{ ETHERTYPE_ARP, "ARP"},
	{ ETHERTYPE_REVARP, "Reverse ARP"},
	{ ETHERTYPE_NS, "NS" },
	{ ETHERTYPE_SPRITE, "Sprite" },
	{ ETHERTYPE_TRAIL, "Trail" },
	{ ETHERTYPE_MOPDL, "MOP DL" },
	{ ETHERTYPE_MOPRC, "MOP RC" },
	{ ETHERTYPE_DN, "DN" },
	{ ETHERTYPE_LAT, "LAT" },
	{ ETHERTYPE_SCA, "SCA" },
	{ ETHERTYPE_TEB, "TEB" },
	{ ETHERTYPE_LANBRIDGE, "Lanbridge" },
	{ ETHERTYPE_DECDNS, "DEC DNS" },
	{ ETHERTYPE_DECDTS, "DEC DTS" },
	{ ETHERTYPE_VEXP, "VEXP" },
	{ ETHERTYPE_VPROD, "VPROD" },
	{ ETHERTYPE_ATALK, "Appletalk" },
	{ ETHERTYPE_AARP, "Appletalk ARP" },
	{ ETHERTYPE_IPX, "IPX" },
	{ ETHERTYPE_PPP, "PPP" },
	{ ETHERTYPE_MPCP, "MPCP" },
	{ ETHERTYPE_SLOW, "Slow Protocols" },
	{ ETHERTYPE_PPPOED, "PPPoE D" },
	{ ETHERTYPE_PPPOES, "PPPoE S" },
	{ ETHERTYPE_EAPOL, "EAPOL" },
	{ ETHERTYPE_RRCP, "RRCP" },
	{ ETHERTYPE_MS_NLB_HB, "MS NLB heartbeat" },
	{ ETHERTYPE_JUMBO, "Jumbo" },
	{ ETHERTYPE_LOOPBACK, "Loopback" },
	{ ETHERTYPE_ISO, "OSI" },
	{ ETHERTYPE_GRE_ISO, "GRE-OSI" },
	{ ETHERTYPE_CFM_OLD, "CFM (old)" },
	{ ETHERTYPE_CFM, "CFM" },
	{ ETHERTYPE_IEEE1905_1, "IEEE1905.1" },
	{ ETHERTYPE_LLDP, "LLDP" },
	{ ETHERTYPE_TIPC, "TIPC"},
	{ ETHERTYPE_GEONET_OLD, "GeoNet (old)"},
	{ ETHERTYPE_GEONET, "GeoNet"},
	{ ETHERTYPE_CALM_FAST, "CALM FAST"},
	{ ETHERTYPE_AOE, "AoE" },
	{ ETHERTYPE_MEDSA, "MEDSA" },
	{ 0, NULL}
	};

	static inline void
	ether_hdr_print(netdissect_options *ndo,
	const u_char *bp, u_int length)
	{
	register const struct ether_header *ep;
	uint16_t length_type;

	ep = (const struct ether_header *)bp;

	ND_PRINT((ndo, "%s > %s",
	etheraddr_string(ndo, ESRC(ep)),
	etheraddr_string(ndo, EDST(ep))));

	length_type = EXTRACT_16BITS(&ep->ether_length_type);
	if (!ndo->ndo_qflag) {
	if (length_type <= ETHERMTU) {
	ND_PRINT((ndo, ", 802.3"));
	length = length_type;
	} else
	ND_PRINT((ndo, ", ethertype %s (0x%04x)",
	tok2str(ethertype_values,"Unknown", length_type),
	length_type));
	} else {
	if (length_type <= ETHERMTU) {
	ND_PRINT((ndo, ", 802.3"));
	length = length_type;
	} else
	ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", length_type)));
	}

	ND_PRINT((ndo, ", length %u: ", length));
	}

	/*
	* Print an Ethernet frame.
	* This might be encapsulated within another frame; we might be passed
	* a pointer to a function that can print header information for that
	* frame's protocol, and an argument to pass to that function.
	*
	* FIXME: caplen can and should be derived from ndo->ndo_snapend and p.
	*/
	u_int
	ether_print(netdissect_options *ndo,
	const u_char *p, u_int length, u_int caplen,
	void (print_encap_header)(netdissect_options ndo, const u_char ), const u_char encap_header_arg)
	{
	const struct ether_header *ep;
	u_int orig_length;
	u_short length_type;
	u_int hdrlen;
	int llc_hdrlen;
	struct lladdr_info src, dst;

	if (caplen < ETHER_HDRLEN) {
	ND_PRINT((ndo, "[\|ether]"));
	return (caplen);
	}
	if (length < ETHER_HDRLEN) {
	ND_PRINT((ndo, "[\|ether]"));
	return (length);
	}

	if (ndo->ndo_eflag) {
	if (print_encap_header != NULL)
	(*print_encap_header)(ndo, encap_header_arg);
	ether_hdr_print(ndo, p, length);
	}
	orig_length = length;

	length -= ETHER_HDRLEN;
	caplen -= ETHER_HDRLEN;
	ep = (const struct ether_header *)p;
	p += ETHER_HDRLEN;
	hdrlen = ETHER_HDRLEN;

	src.addr = ESRC(ep);
	src.addr_string = etheraddr_string;
	dst.addr = EDST(ep);
	dst.addr_string = etheraddr_string;
	length_type = EXTRACT_16BITS(&ep->ether_length_type);

	recurse:
	/*
	* Is it (gag) an 802.3 encapsulation?
	*/
	if (length_type <= ETHERMTU) {
	/* Try to print the LLC-layer header & higher layers */
	llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
	if (llc_hdrlen < 0) {
	/* packet type not known, print raw packet */
	if (!ndo->ndo_suppress_default_print)
	ND_DEFAULTPRINT(p, caplen);
	llc_hdrlen = -llc_hdrlen;
	}
	hdrlen += llc_hdrlen;
	} else if (length_type == ETHERTYPE_8021Q \|\|
	length_type == ETHERTYPE_8021Q9100 \|\|
	length_type == ETHERTYPE_8021Q9200 \|\|
	length_type == ETHERTYPE_8021QinQ) {
	/*
	* Print VLAN information, and then go back and process
	* the enclosed type field.
	*/
	if (caplen < 4) {
	ND_PRINT((ndo, "[\|vlan]"));
	return (hdrlen + caplen);
	}
	if (length < 4) {
	ND_PRINT((ndo, "[\|vlan]"));
	return (hdrlen + length);
	}
	if (ndo->ndo_eflag) {
	uint16_t tag = EXTRACT_16BITS(p);

	ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
	}

	length_type = EXTRACT_16BITS(p + 2);
	if (ndo->ndo_eflag && length_type > ETHERMTU)
	ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", length_type)));
	p += 4;
	length -= 4;
	caplen -= 4;
	hdrlen += 4;
	goto recurse;
	} else if (length_type == ETHERTYPE_JUMBO) {
	/*
	* Alteon jumbo frames.
	* See
	*
	* http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
	*
	* which indicates that, following the type field,
	* there's an LLC header and payload.
	*/
	/* Try to print the LLC-layer header & higher layers */
	llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
	if (llc_hdrlen < 0) {
	/* packet type not known, print raw packet */
	if (!ndo->ndo_suppress_default_print)
	ND_DEFAULTPRINT(p, caplen);
	llc_hdrlen = -llc_hdrlen;
	}
	hdrlen += llc_hdrlen;
	} else {
	if (ethertype_print(ndo, length_type, p, length, caplen, &src, &dst) == 0) {
	/* type not known, print raw packet */
	if (!ndo->ndo_eflag) {
	if (print_encap_header != NULL)
	(*print_encap_header)(ndo, encap_header_arg);
	ether_hdr_print(ndo, (const u_char *)ep, orig_length);
	}

	if (!ndo->ndo_suppress_default_print)
	ND_DEFAULTPRINT(p, caplen);
	}
	}
	return (hdrlen);
	}

	/*
	* This is the top level routine of the printer. 'p' points
	* to the ether header of the packet, 'h->len' is the length
	* of the packet off the wire, and 'h->caplen' is the number
	* of bytes actually captured.
	*/
	u_int
	ether_if_print(netdissect_options ndo, const struct pcap_pkthdr h,
	const u_char *p)
	{
	return (ether_print(ndo, p, h->len, h->caplen, NULL, NULL));
	}

	/*
	* This is the top level routine of the printer. 'p' points
	* to the ether header of the packet, 'h->len' is the length
	* of the packet off the wire, and 'h->caplen' is the number
	* of bytes actually captured.
	*
	* This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
	* before the Ethernet header.
	*/
	u_int
	netanalyzer_if_print(netdissect_options ndo, const struct pcap_pkthdr h,
	const u_char *p)
	{
	/*
	* Fail if we don't have enough data for the Hilscher pseudo-header.
	*/
	if (h->len < 4 \|\| h->caplen < 4) {
	ND_PRINT((ndo, "[\|netanalyzer]"));
	return (h->caplen);
	}

	/* Skip the pseudo-header. */
	return (4 + ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL));
	}

	/*
	* This is the top level routine of the printer. 'p' points
	* to the ether header of the packet, 'h->len' is the length
	* of the packet off the wire, and 'h->caplen' is the number
	* of bytes actually captured.
	*
	* This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
	* pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
	* before the Ethernet header.
	*/
	u_int
	netanalyzer_transparent_if_print(netdissect_options *ndo,
	const struct pcap_pkthdr *h,
	const u_char *p)
	{
	/*
	* Fail if we don't have enough data for the Hilscher pseudo-header,
	* preamble, and SOF.
	*/
	if (h->len < 12 \|\| h->caplen < 12) {
	ND_PRINT((ndo, "[\|netanalyzer-transparent]"));
	return (h->caplen);
	}

	/* Skip the pseudo-header, preamble, and SOF. */
	return (12 + ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL));
	}

	/*
	* Prints the packet payload, given an Ethernet type code for the payload's
	* protocol.
	*
	* Returns non-zero if it can do so, zero if the ethertype is unknown.
	*/

	int
	ethertype_print(netdissect_options *ndo,
	u_short ether_type, const u_char *p,
	u_int length, u_int caplen,
	const struct lladdr_info src, const struct lladdr_info dst)
	{
	switch (ether_type) {

	case ETHERTYPE_IP:
	ip_print(ndo, p, length);
	return (1);

	case ETHERTYPE_IPV6:
	ip6_print(ndo, p, length);
	return (1);

	case ETHERTYPE_ARP:
	case ETHERTYPE_REVARP:
	arp_print(ndo, p, length, caplen);
	return (1);

	case ETHERTYPE_DN:
	decnet_print(ndo, p, length, caplen);
	return (1);

	case ETHERTYPE_ATALK:
	if (ndo->ndo_vflag)
	ND_PRINT((ndo, "et1 "));
	atalk_print(ndo, p, length);
	return (1);

	case ETHERTYPE_AARP:
	aarp_print(ndo, p, length);
	return (1);

	case ETHERTYPE_IPX:
	ND_PRINT((ndo, "(NOV-ETHII) "));
	ipx_print(ndo, p, length);
	return (1);

	case ETHERTYPE_ISO:
	if (length == 0 \|\| caplen == 0) {
	ND_PRINT((ndo, " [\|osi]"));
	return (1);
	}
	isoclns_print(ndo, p + 1, length - 1);
	return(1);

	case ETHERTYPE_PPPOED:
	case ETHERTYPE_PPPOES:
	case ETHERTYPE_PPPOED2:
	case ETHERTYPE_PPPOES2:
	pppoe_print(ndo, p, length);
	return (1);

	case ETHERTYPE_EAPOL:
	eap_print(ndo, p, length);
	return (1);

	case ETHERTYPE_RRCP:
	rrcp_print(ndo, p, length, src, dst);
	return (1);

	case ETHERTYPE_PPP:
	if (length) {
	ND_PRINT((ndo, ": "));
	ppp_print(ndo, p, length);
	}
	return (1);

	case ETHERTYPE_MPCP:
	mpcp_print(ndo, p, length);
	return (1);

	case ETHERTYPE_SLOW:
	slow_print(ndo, p, length);
	return (1);

	case ETHERTYPE_CFM:
	case ETHERTYPE_CFM_OLD:
	cfm_print(ndo, p, length);
	return (1);

	case ETHERTYPE_LLDP:
	lldp_print(ndo, p, length);
	return (1);

	case ETHERTYPE_LOOPBACK:
	loopback_print(ndo, p, length);
	return (1);

	case ETHERTYPE_MPLS:
	case ETHERTYPE_MPLS_MULTI:
	mpls_print(ndo, p, length);
	return (1);

	case ETHERTYPE_TIPC:
	tipc_print(ndo, p, length, caplen);
	return (1);

	case ETHERTYPE_MS_NLB_HB:
	msnlb_print(ndo, p);
	return (1);

	case ETHERTYPE_GEONET_OLD:
	case ETHERTYPE_GEONET:
	geonet_print(ndo, p, length, src);
	return (1);

	case ETHERTYPE_CALM_FAST:
	calm_fast_print(ndo, p, length, src);
	return (1);

	case ETHERTYPE_AOE:
	aoe_print(ndo, p, length);
	return (1);

	case ETHERTYPE_MEDSA:
	medsa_print(ndo, p, length, caplen, src, dst);
	return (1);

	case ETHERTYPE_LAT:
	case ETHERTYPE_SCA:
	case ETHERTYPE_MOPRC:
	case ETHERTYPE_MOPDL:
	case ETHERTYPE_IEEE1905_1:
	/* default_print for now */
	default:
	return (0);
	}
	}


	/*
	* Local Variables:
	* c-style: whitesmith
	* c-basic-offset: 8
	* End:
	*/