interface.h - platform/external/tcpdump - Git at Google

 /*
  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 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.
  *
  * @(#) $Header: /tcpdump/master/tcpdump/interface.h,v 1.120 2000-01-15 07:42:32 itojun Exp $ (LBL)
  */

 #ifndef tcpdump_interface_h
 #define tcpdump_interface_h

 #include "gnuc.h"
 #ifdef HAVE_OS_PROTO_H
 #include "os-proto.h"
 #endif
 #include <sys/types.h>
 #include <sys/time.h>

 /* snprintf et al */

 #include <stdarg.h>

 #if !defined(HAVE_SNPRINTF)
 int snprintf (char *str, size_t sz, const char *format, ...)
      __attribute__ ((format (printf, 3, 4)));
 #endif

 #if !defined(HAVE_VSNPRINTF)
 int vsnprintf (char *str, size_t sz, const char *format, va_list ap)
      __attribute__((format (printf, 3, 0)));
 #endif

 #if !defined(HAVE_ASPRINTF)
 int asprintf (char **ret, const char *format, ...)
      __attribute__ ((format (printf, 2, 3)));
 #endif

 #if !defined(HAVE_VASPRINTF)
 int vasprintf (char **ret, const char *format, va_list ap)
      __attribute__((format (printf, 2, 0)));
 #endif

 #if !defined(HAVE_ASNPRINTF)
 int asnprintf (char **ret, size_t max_sz, const char *format, ...)
      __attribute__ ((format (printf, 3, 4)));
 #endif

 #if !defined(HAVE_VASNPRINTF)
 int vasnprintf (char **ret, size_t max_sz, const char *format, va_list ap)
      __attribute__((format (printf, 3, 0)));
 #endif

 struct tok {
 	int v;			/* value */
 	char *s;		/* string */
 };

 extern int aflag;		/* translate network and broadcast addresses */
 extern int dflag;		/* print filter code */
 extern int eflag;		/* print ethernet header */
 extern int fflag;		/* don't translate "foreign" IP address */
 extern int nflag;		/* leave addresses as numbers */
 extern int Nflag;		/* remove domains from printed host names */
 extern int qflag;		/* quick (shorter) output */
 extern int Rflag;		/* print sequence # field in AH/ESP*/
 extern int sflag;		/* use the libsmi to translate OIDs */
 extern int Sflag;		/* print raw TCP sequence numbers */
 extern int tflag;		/* print packet arrival time */
 extern int vflag;		/* verbose */
 extern int xflag;		/* print packet in hex */
 extern int Xflag;		/* print packet in hex/ascii */

 extern char *espsecret;

 extern int packettype;		/* as specified by -T */
 #define PT_VAT		1	/* Visual Audio Tool */
 #define PT_WB		2	/* distributed White Board */
 #define PT_RPC		3	/* Remote Procedure Call */
 #define PT_RTP		4	/* Real-Time Applications protocol */
 #define PT_RTCP		5	/* Real-Time Applications control protocol */
 #define PT_SNMP		6	/* Simple Network Management Protocol */

 #ifndef min
 #define min(a,b) ((a)>(b)?(b):(a))
 #endif
 #ifndef max
 #define max(a,b) ((b)>(a)?(b):(a))
 #endif

 #ifndef INET6
 /*
  * The default snapshot length.  This value allows most printers to print
  * useful information while keeping the amount of unwanted data down.
  * In particular, it allows for an ethernet header, tcp/ip header, and
  * 14 bytes of data (assuming no ip options).
  */
 #define DEFAULT_SNAPLEN 68
 #else
 #define DEFAULT_SNAPLEN 96
 #endif

 #ifndef BIG_ENDIAN
 #define BIG_ENDIAN 4321
 #define LITTLE_ENDIAN 1234
 #endif

 #ifdef ETHER_HEADER_HAS_EA
 #define ESRC(ep) ((ep)->ether_shost.ether_addr_octet)
 #define EDST(ep) ((ep)->ether_dhost.ether_addr_octet)
 #else
 #define ESRC(ep) ((ep)->ether_shost)
 #define EDST(ep) ((ep)->ether_dhost)
 #endif

 #ifdef ETHER_ARP_HAS_X
 #define SHA(ap) ((ap)->arp_xsha)
 #define THA(ap) ((ap)->arp_xtha)
 #define SPA(ap) ((ap)->arp_xspa)
 #define TPA(ap) ((ap)->arp_xtpa)
 #else
 #ifdef ETHER_ARP_HAS_EA
 #define SHA(ap) ((ap)->arp_sha.ether_addr_octet)
 #define THA(ap) ((ap)->arp_tha.ether_addr_octet)
 #else
 #define SHA(ap) ((ap)->arp_sha)
 #define THA(ap) ((ap)->arp_tha)
 #endif
 #define SPA(ap) ((ap)->arp_spa)
 #define TPA(ap) ((ap)->arp_tpa)
 #endif

 #ifndef NTOHL
 #define NTOHL(x)	(x) = ntohl(x)
 #define NTOHS(x)	(x) = ntohs(x)
 #define HTONL(x)	(x) = htonl(x)
 #define HTONS(x)	(x) = htons(x)
 #endif
 #endif

 extern char *program_name;	/* used to generate self-identifying messages */

 extern int32_t thiszone;	/* seconds offset from gmt to local time */

 extern int snaplen;
 /* global pointers to beginning and end of current packet (during printing) */
 extern const u_char *packetp;
 extern const u_char *snapend;

 /* True if  "l" bytes of "var" were captured */
 #define TTEST2(var, l) ((u_char *)&(var) <= snapend - (l))

 /* True if "var" was captured */
 #define TTEST(var) TTEST2(var, sizeof(var))

 /* Bail if "l" bytes of "var" were not captured */
 #define TCHECK2(var, l) if (!TTEST2(var, l)) goto trunc

 /* Bail if "var" was not captured */
 #define TCHECK(var) TCHECK2(var, sizeof(var))

 #ifdef __STDC__
 struct timeval;
 #endif

 extern void ts_print(const struct timeval *);
 extern void relts_print(int);

 extern int fn_print(const u_char *, const u_char *);
 extern int fn_printn(const u_char *, u_int, const u_char *);
 extern const char *tok2str(const struct tok *, const char *, int);
 extern char *dnaddr_string(u_short);

 extern void wrapup(int);

 #if __STDC__
 extern __dead void error(const char *, ...)
     __attribute__((volatile, format (printf, 1, 2)));
 extern void warning(const char *, ...) __attribute__ ((format (printf, 1, 2)));
 #endif

 extern char *read_infile(char *);
 extern char *copy_argv(char **);

 extern char *isonsap_string(const u_char *);
 extern char *llcsap_string(u_char);
 extern char *protoid_string(const u_char *);
 extern char *dnname_string(u_short);
 extern char *dnnum_string(u_short);

 /* The printer routines. */

 #ifdef __STDC__
 struct pcap_pkthdr;
 #endif

 extern void ascii_print_with_offset(const u_char *, u_int, u_int);
 extern void ascii_print(const u_char *, u_int);
 extern void hex_print_with_offset(const u_char *, u_int, u_int);
 extern void telnet_print(const u_char *, u_int);
 extern void hex_print(const u_char *, u_int);
 extern int ether_encap_print(u_short, const u_char *, u_int, u_int);
 extern int llc_print(const u_char *, u_int, u_int, const u_char *,
 	const u_char *);
 extern void aarp_print(const u_char *, u_int);
 extern void arp_print(const u_char *, u_int, u_int);
 extern void atalk_print(const u_char *, u_int);
 extern void atm_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
 extern void bootp_print(const u_char *, u_int, u_short, u_short);
 extern void bgp_print(const u_char *, int);
 extern void decnet_print(const u_char *, u_int, u_int);
 extern void default_print(const u_char *, u_int);
 extern void default_print_unaligned(const u_char *, u_int);
 extern void dvmrp_print(const u_char *, u_int);
 extern void egp_print(const u_char *, u_int, const u_char *);
 extern void ether_if_print(u_char *, const struct pcap_pkthdr *,
 	const u_char *);
 extern void fddi_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
 extern void gre_print(const u_char *, u_int);
 extern void icmp_print(const u_char *, u_int, const u_char *);
 extern void igrp_print(const u_char *, u_int, const u_char *);
 extern void ip_print(const u_char *, u_int);
 extern void ipx_print(const u_char *, u_int);
 extern void isoclns_print(const u_char *, u_int, u_int, const u_char *,
 	const u_char *);
 extern void krb_print(const u_char *, u_int);
 extern void nfsreply_print(const u_char *, u_int, const u_char *);
 extern void nfsreq_print(const u_char *, u_int, const u_char *);
 extern void ns_print(const u_char *, u_int);
 extern void ntp_print(const u_char *, u_int);
 extern void null_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
 extern void ospf_print(const u_char *, u_int, const u_char *);
 extern void pimv1_print(const u_char *, u_int);
 extern void cisco_autorp_print(const u_char *, u_int);
 extern void mobile_print(const u_char *, u_int);
 extern void pim_print(const u_char *, u_int);
 extern void pppoe_print(const u_char *, u_int);
 extern void ppp_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
 extern void ppp_bsdos_if_print(u_char *, const struct pcap_pkthdr *,
 	const u_char *);
 extern int vjc_print(register const char *, register u_int, u_short);
 extern void raw_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
 extern void rip_print(const u_char *, u_int);
 extern void sl_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
 extern void lane_if_print(u_char *, const struct pcap_pkthdr *,const u_char *);
 extern void cip_if_print(u_char *, const struct pcap_pkthdr *,const u_char *);
 extern void sl_bsdos_if_print(u_char *, const struct pcap_pkthdr *,
     const u_char *);
 extern void chdlc_if_print(u_char *, const struct pcap_pkthdr *,
     const u_char *);
 extern void snmp_print(const u_char *, u_int);
 extern void sunrpcrequest_print(const u_char *, u_int, const u_char *);
 extern void tcp_print(const u_char *, u_int, const u_char *);
 extern void tftp_print(const u_char *, u_int);
 extern void udp_print(const u_char *, u_int, const u_char *);
 extern void wb_print(const void *, u_int);
 extern int ah_print(register const u_char *, register const u_char *);
 extern int esp_print(register const u_char *, register const u_char *, int *);
 extern void isakmp_print(const u_char *, u_int, const u_char *);
 extern int ipcomp_print(register const u_char *, register const u_char *, int *);
 extern void rx_print(register const u_char *, int, int, int, u_char *);
 extern void netbeui_print(const u_char *, const u_char *);
 extern void ipx_netbios_print(const u_char *, const u_char *);
 extern void nbt_tcp_print(const u_char *, int);
 extern void nbt_udp137_print(const u_char *data, int);
 extern void nbt_udp138_print(const u_char *data, int);
 extern char *smb_errstr(int, int);
 extern void print_data(const unsigned char *, int);
 extern void l2tp_print(const u_char *, u_int);
 extern void lcp_print(const u_char *, u_int);

 #ifdef INET6
 extern void ip6_print(const u_char *, int);
 extern void ip6_opt_print(const u_char *, int);
 extern int hbhopt_print(const u_char *);
 extern int dstopt_print(const u_char *);
 extern int frag6_print(const u_char *, const u_char *);
 extern void icmp6_print(const u_char *, const u_char *);
 extern void ripng_print(const u_char *, int);
 extern int rt6_print(const u_char *, const u_char *);
 extern void ospf6_print(const u_char *, u_int);
 extern void dhcp6_print(const u_char *, u_int, u_short, u_short);
 #endif /*INET6*/
 extern u_short in_cksum(const u_short *addr, register int len, u_short csum);
	/*
	* Copyright (c) 1988, 1989, 1990, 1991, 1992, 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.
	*
	* @(#) $Header: /tcpdump/master/tcpdump/interface.h,v 1.120 2000-01-15 07:42:32 itojun Exp $ (LBL)
	*/

	#ifndef tcpdump_interface_h
	#define tcpdump_interface_h

	#include "gnuc.h"
	#ifdef HAVE_OS_PROTO_H
	#include "os-proto.h"
	#endif
	#include <sys/types.h>
	#include <sys/time.h>

	/* snprintf et al */

	#include <stdarg.h>

	#if !defined(HAVE_SNPRINTF)
	int snprintf (char str, size_t sz, const char format, ...)
	__attribute__ ((format (printf, 3, 4)));
	#endif

	#if !defined(HAVE_VSNPRINTF)
	int vsnprintf (char str, size_t sz, const char format, va_list ap)
	__attribute__((format (printf, 3, 0)));
	#endif

	#if !defined(HAVE_ASPRINTF)
	int asprintf (char *ret, const char format, ...)
	__attribute__ ((format (printf, 2, 3)));
	#endif

	#if !defined(HAVE_VASPRINTF)
	int vasprintf (char *ret, const char format, va_list ap)
	__attribute__((format (printf, 2, 0)));
	#endif

	#if !defined(HAVE_ASNPRINTF)
	int asnprintf (char *ret, size_t max_sz, const char format, ...)
	__attribute__ ((format (printf, 3, 4)));
	#endif

	#if !defined(HAVE_VASNPRINTF)
	int vasnprintf (char *ret, size_t max_sz, const char format, va_list ap)
	__attribute__((format (printf, 3, 0)));
	#endif

	struct tok {
	int v; /* value */
	char s; / string */
	};

	extern int aflag; /* translate network and broadcast addresses */
	extern int dflag; /* print filter code */
	extern int eflag; /* print ethernet header */
	extern int fflag; /* don't translate "foreign" IP address */
	extern int nflag; /* leave addresses as numbers */
	extern int Nflag; /* remove domains from printed host names */
	extern int qflag; /* quick (shorter) output */
	extern int Rflag; /* print sequence # field in AH/ESP*/
	extern int sflag; /* use the libsmi to translate OIDs */
	extern int Sflag; /* print raw TCP sequence numbers */
	extern int tflag; /* print packet arrival time */
	extern int vflag; /* verbose */
	extern int xflag; /* print packet in hex */
	extern int Xflag; /* print packet in hex/ascii */

	extern char *espsecret;

	extern int packettype; /* as specified by -T */
	#define PT_VAT 1 /* Visual Audio Tool */
	#define PT_WB 2 /* distributed White Board */
	#define PT_RPC 3 /* Remote Procedure Call */
	#define PT_RTP 4 /* Real-Time Applications protocol */
	#define PT_RTCP 5 /* Real-Time Applications control protocol */
	#define PT_SNMP 6 /* Simple Network Management Protocol */

	#ifndef min
	#define min(a,b) ((a)>(b)?(b):(a))
	#endif
	#ifndef max
	#define max(a,b) ((b)>(a)?(b):(a))
	#endif

	#ifndef INET6
	/*
	* The default snapshot length. This value allows most printers to print
	* useful information while keeping the amount of unwanted data down.
	* In particular, it allows for an ethernet header, tcp/ip header, and
	* 14 bytes of data (assuming no ip options).
	*/
	#define DEFAULT_SNAPLEN 68
	#else
	#define DEFAULT_SNAPLEN 96
	#endif

	#ifndef BIG_ENDIAN
	#define BIG_ENDIAN 4321
	#define LITTLE_ENDIAN 1234
	#endif

	#ifdef ETHER_HEADER_HAS_EA
	#define ESRC(ep) ((ep)->ether_shost.ether_addr_octet)
	#define EDST(ep) ((ep)->ether_dhost.ether_addr_octet)
	#else
	#define ESRC(ep) ((ep)->ether_shost)
	#define EDST(ep) ((ep)->ether_dhost)
	#endif

	#ifdef ETHER_ARP_HAS_X
	#define SHA(ap) ((ap)->arp_xsha)
	#define THA(ap) ((ap)->arp_xtha)
	#define SPA(ap) ((ap)->arp_xspa)
	#define TPA(ap) ((ap)->arp_xtpa)
	#else
	#ifdef ETHER_ARP_HAS_EA
	#define SHA(ap) ((ap)->arp_sha.ether_addr_octet)
	#define THA(ap) ((ap)->arp_tha.ether_addr_octet)
	#else
	#define SHA(ap) ((ap)->arp_sha)
	#define THA(ap) ((ap)->arp_tha)
	#endif
	#define SPA(ap) ((ap)->arp_spa)
	#define TPA(ap) ((ap)->arp_tpa)
	#endif

	#ifndef NTOHL
	#define NTOHL(x) (x) = ntohl(x)
	#define NTOHS(x) (x) = ntohs(x)
	#define HTONL(x) (x) = htonl(x)
	#define HTONS(x) (x) = htons(x)
	#endif
	#endif

	extern char program_name; / used to generate self-identifying messages */

	extern int32_t thiszone; /* seconds offset from gmt to local time */

	extern int snaplen;
	/* global pointers to beginning and end of current packet (during printing) */
	extern const u_char *packetp;
	extern const u_char *snapend;

	/* True if "l" bytes of "var" were captured */
	#define TTEST2(var, l) ((u_char *)&(var) <= snapend - (l))

	/* True if "var" was captured */
	#define TTEST(var) TTEST2(var, sizeof(var))

	/* Bail if "l" bytes of "var" were not captured */
	#define TCHECK2(var, l) if (!TTEST2(var, l)) goto trunc

	/* Bail if "var" was not captured */
	#define TCHECK(var) TCHECK2(var, sizeof(var))

	#ifdef __STDC__
	struct timeval;
	#endif

	extern void ts_print(const struct timeval *);
	extern void relts_print(int);

	extern int fn_print(const u_char , const u_char );
	extern int fn_printn(const u_char , u_int, const u_char );
	extern const char tok2str(const struct tok , const char *, int);
	extern char *dnaddr_string(u_short);

	extern void wrapup(int);

	#if __STDC__
	extern __dead void error(const char *, ...)
	__attribute__((volatile, format (printf, 1, 2)));
	extern void warning(const char *, ...) __attribute__ ((format (printf, 1, 2)));
	#endif

	extern char read_infile(char );
	extern char copy_argv(char *);

	extern char isonsap_string(const u_char );
	extern char *llcsap_string(u_char);
	extern char protoid_string(const u_char );
	extern char *dnname_string(u_short);
	extern char *dnnum_string(u_short);

	/* The printer routines. */

	#ifdef __STDC__
	struct pcap_pkthdr;
	#endif

	extern void ascii_print_with_offset(const u_char *, u_int, u_int);
	extern void ascii_print(const u_char *, u_int);
	extern void hex_print_with_offset(const u_char *, u_int, u_int);
	extern void telnet_print(const u_char *, u_int);
	extern void hex_print(const u_char *, u_int);
	extern int ether_encap_print(u_short, const u_char *, u_int, u_int);
	extern int llc_print(const u_char , u_int, u_int, const u_char ,
	const u_char *);
	extern void aarp_print(const u_char *, u_int);
	extern void arp_print(const u_char *, u_int, u_int);
	extern void atalk_print(const u_char *, u_int);
	extern void atm_if_print(u_char , const struct pcap_pkthdr , const u_char *);
	extern void bootp_print(const u_char *, u_int, u_short, u_short);
	extern void bgp_print(const u_char *, int);
	extern void decnet_print(const u_char *, u_int, u_int);
	extern void default_print(const u_char *, u_int);
	extern void default_print_unaligned(const u_char *, u_int);
	extern void dvmrp_print(const u_char *, u_int);
	extern void egp_print(const u_char , u_int, const u_char );
	extern void ether_if_print(u_char , const struct pcap_pkthdr ,
	const u_char *);
	extern void fddi_if_print(u_char , const struct pcap_pkthdr , const u_char *);
	extern void gre_print(const u_char *, u_int);
	extern void icmp_print(const u_char , u_int, const u_char );
	extern void igrp_print(const u_char , u_int, const u_char );
	extern void ip_print(const u_char *, u_int);
	extern void ipx_print(const u_char *, u_int);
	extern void isoclns_print(const u_char , u_int, u_int, const u_char ,
	const u_char *);
	extern void krb_print(const u_char *, u_int);
	extern void nfsreply_print(const u_char , u_int, const u_char );
	extern void nfsreq_print(const u_char , u_int, const u_char );
	extern void ns_print(const u_char *, u_int);
	extern void ntp_print(const u_char *, u_int);
	extern void null_if_print(u_char , const struct pcap_pkthdr , const u_char *);
	extern void ospf_print(const u_char , u_int, const u_char );
	extern void pimv1_print(const u_char *, u_int);
	extern void cisco_autorp_print(const u_char *, u_int);
	extern void mobile_print(const u_char *, u_int);
	extern void pim_print(const u_char *, u_int);
	extern void pppoe_print(const u_char *, u_int);
	extern void ppp_if_print(u_char , const struct pcap_pkthdr , const u_char *);
	extern void ppp_bsdos_if_print(u_char , const struct pcap_pkthdr ,
	const u_char *);
	extern int vjc_print(register const char *, register u_int, u_short);
	extern void raw_if_print(u_char , const struct pcap_pkthdr , const u_char *);
	extern void rip_print(const u_char *, u_int);
	extern void sl_if_print(u_char , const struct pcap_pkthdr , const u_char *);
	extern void lane_if_print(u_char , const struct pcap_pkthdr ,const u_char *);
	extern void cip_if_print(u_char , const struct pcap_pkthdr ,const u_char *);
	extern void sl_bsdos_if_print(u_char , const struct pcap_pkthdr ,
	const u_char *);
	extern void chdlc_if_print(u_char , const struct pcap_pkthdr ,
	const u_char *);
	extern void snmp_print(const u_char *, u_int);
	extern void sunrpcrequest_print(const u_char , u_int, const u_char );
	extern void tcp_print(const u_char , u_int, const u_char );
	extern void tftp_print(const u_char *, u_int);
	extern void udp_print(const u_char , u_int, const u_char );
	extern void wb_print(const void *, u_int);
	extern int ah_print(register const u_char , register const u_char );
	extern int esp_print(register const u_char , register const u_char , int *);
	extern void isakmp_print(const u_char , u_int, const u_char );
	extern int ipcomp_print(register const u_char , register const u_char , int *);
	extern void rx_print(register const u_char , int, int, int, u_char );
	extern void netbeui_print(const u_char , const u_char );
	extern void ipx_netbios_print(const u_char , const u_char );
	extern void nbt_tcp_print(const u_char *, int);
	extern void nbt_udp137_print(const u_char *data, int);
	extern void nbt_udp138_print(const u_char *data, int);
	extern char *smb_errstr(int, int);
	extern void print_data(const unsigned char *, int);
	extern void l2tp_print(const u_char *, u_int);
	extern void lcp_print(const u_char *, u_int);

	#ifdef INET6
	extern void ip6_print(const u_char *, int);
	extern void ip6_opt_print(const u_char *, int);
	extern int hbhopt_print(const u_char *);
	extern int dstopt_print(const u_char *);
	extern int frag6_print(const u_char , const u_char );
	extern void icmp6_print(const u_char , const u_char );
	extern void ripng_print(const u_char *, int);
	extern int rt6_print(const u_char , const u_char );
	extern void ospf6_print(const u_char *, u_int);
	extern void dhcp6_print(const u_char *, u_int, u_short, u_short);
	#endif /INET6/
	extern u_short in_cksum(const u_short *addr, register int len, u_short csum);