typedef struct tab_t tab_t;
struct tab_t {
	int	n;
	char	*str;
	tab_t	*tab;
};

tab_t Ipcpopts[] = {
	{ 1,	"IP-Addresses (deprecated)" },
	{ 2,	"IP-Compression-Protocol" },
	{ 3,	"IP-Address" },
	{ 4,	"Mobile-IPv4" },
	{ 129,	"Primary DNS Server Address" },
	{ 130,	"Primary NBNS Server Address" },
	{ 131,	"Secondary DNS Server Address" },
	{ 132,	"Secondary NBNS Server Address" },
	{ -1,	"?" },
};

tab_t Ccpopts[] = {
	{ 0,	"OUI" },
	{ 1,	"Predictor type 1" },
	{ 2,	"Predictor type 2" },
	{ 3,	"Puddle Jumper" },
	{ 16,	"Hewlett-Packard PPC" },
	{ 17,	"Stac Electronics LZS" },
	{ 18,	"Microsoft PPC" },
	{ 19,	"Gandalf FZA" },
	{ 20,	"V.42bis compression" },
	{ 21,	"BSD Compress" },
	{ 22,	"unassigned" },
	{ 23,	"LZS-DCP" },
	{ 24,	"MVRCA (Magnalink)" },
	{ 25,	"Unassigned" },
	{ 26,	"Deflate" },
	{ 27,	"V.44/LZJH Compression Protocol" },
	{ 31,	"THWACK bell-labs, unofficial" },
	{ 255,	"Reserved" },
	{ -1,	"?" },
};
                      
tab_t Ecpopts[] = {
	{ 0,	"OUI" },
	{ 1,	"Deprecated (DESE)" },
	{ 2,	"3DESE" },
	{ 3,	"DESE-bis" },
	{ -1,	"?" },
};
                            
tab_t Lcpopts[] = {
	{ 0,	"Vendor Specific" },
	{ 1,	"Maximum-Receive-Unit" },
	{ 2,	"Async-Control-Character-Map" },
	{ 3,	"Authentication-Protocol" },
	{ 4,	"Quality-Protocol" },
	{ 5,	"Magic-Number" },
	{ 6,	"DEPRECATED (Quality-Protocol)" },
	{ 7,	"Protocol-Field-Compression" },
	{ 8,	"Address-and-Control-Field-Compression" },
	{ 9,	"FCS-Alternatives" },
	{ 10,	"Self-Describing-Pad" },
	{ 11,	"Numbered-Mode" },
	{ 12,	"DEPRECATED (Multi-Link-Procedure)" },
	{ 13,	"Callback" },
	{ 14,	"DEPRECATED (Connect-Time)" },
	{ 15,	"DEPRECATED (Compound-Frames)" },
	{ 16,	"DEPRECATED (Nominal-Data-Encapsulation)" },
	{ 17,	"Multilink-MRRU" },
	{ 18,	"Multilink-Short-Sequence-Number-Header" },
	{ 19,	"Multilink-Endpoint-Discriminator" },
	{ 20,	"Proprietary" },
	{ 21,	"DCE-Identifier" },
	{ 22,	"Multi-Link-Plus-Procedure" },
	{ 23,	"Link Discriminator for BACP" },
	{ 24,	"LCP-Authentication-Option" },
	{ 25,	"Consistent Overhead Byte Stuffing (COBS)" },
	{ 26,	"Prefix elision" },
	{ 27,	"Multilink header format" },
	{ 28,	"Internationalization" },
	{ 29,	"Simple Data Link on SONET/SDH" },
	{ 30,	"Reserved until 14-Oct-2002" },
	{ -1,	"?" }
};

tab_t Sdcpopts[] = {
	{ 1,	"Packet-Format" },
	{ 2,	"Header-Type" },
	{ 3,	"Length-Field-Present" },
	{ 4,	"Multi-Port" },
	{ 5,	"Transport-Mode" },
	{ 6,	"Maximum-Frame-Size" },
	{ 7,	"Allow-Odd-Frames" },
	{ 8,	"FCS-Type" },
	{ 9,	"Flow-Expiration-Time" },
	{ -1,	"?" }
};

tab_t Callback[] = {
	{ 0,	"Location determined by user authentication." },
	{ 1,	"Dialing string." },
	{ 2,	"Location identifier." },
	{ 3,	"E.164 number." },
	{ 4,	"X.500 distinguished name." },
	{ 5,	"unassigned" },
	{ 6,	"Location is determined during CBCP negotiation." },
	{ -1,	"?" }
};

tab_t Fcsopts[] = {
	{ 1,	"Null FCS" },
	{ 2,	"CCITT 16-Bit FCS" },
	{ 4,	"CCITT 32-bit FCS" },
	{ -1,	"?" }
};

tab_t Chapopts[] = {
	{ 0,	"Reserved" },
	{ 1,	"Reserved" },
	{ 2,	"Reserved" },
	{ 3,	"Reserved" },
	{ 4,	"Reserved" },
	{ 5,	"CHAP with MD5" },
	{ 128,	"MS-CHAP" },
	{ 129,	"MS-CHAP-2" },
	{ -1,	"?" }
};

tab_t Papopts[] = {
	{ 1,	"Auth-Request" },
	{ 2,	"Auth-Ack" },
	{ 3,	"Auth-Nak" },
	{ -1,	"?" }
};

tab_t Options[] = {
	{ 0,	"Vendor Specific" },
	{ 1,	"Configure-Request" },
	{ 2,	"Configure-Ack" },
	{ 3,	"Configure-Nak" },
	{ 4,	"Configure-Reject" },
	{ 5,	"Terminate-Request" },
	{ 6,	"Terminate-Ack" },
	{ 7,	"Code-Reject" },
	{ 8,	"Protocol-Reject" },
	{ 9,	"Echo-Request" },
	{ 10,	"Echo-Reply" },
	{ 11,	"Discard-Request" },
	{ 12,	"Identification" },
	{ 13,	"Time-Remaining" },
	{ 14,	"Reset-Request" },
	{ 15,	"Reset-Reply" },
	{ -1,	"?" }
};


tab_t Protocols[] = {
	{ 0x0001,	"Padding Protocol" },
	{ 0x0003,	"ROHC small-CID" },
	{ 0x0005,	"ROHC large-CID" },
	{ 0x0021,	"Internet Protocol version 4" },
	{ 0x0023,	"OSI Network Layer" },
	{ 0x0025,	"Xerox NS IDP" },
	{ 0x0027,	"DECnet Phase IV" },
	{ 0x0029,	"Appletalk" },
	{ 0x002b,	"Novell IPX" },
	{ 0x002d,	"Van Jacobson Compressed TCP/IP" },
	{ 0x002f,	"Van Jacobson Uncompressed TCP/IP" },
	{ 0x0031,	"Bridging PDU" },
	{ 0x0033,	"Stream Protocol (ST-II)" },
	{ 0x0035,	"Banyan Vines" },
	{ 0x0037,	"reserved (until 1993)" },
	{ 0x0039,	"AppleTalk EDDP" },
	{ 0x003b,	"AppleTalk SmartBuffered" },
	{ 0x003d,	"Multi-Link" },
	{ 0x003f,	"NETBIOS Framing" },
	{ 0x0041,	"Cisco Systems" },
	{ 0x0043,	"Ascom Timeplex" },
	{ 0x0045,	"Fujitsu Link Backup and Load Balancing (LBLB)" },
	{ 0x0047,	"DCA Remote Lan" },
	{ 0x0049,	"Serial Data Transport Protocol (PPP-SDTP)" },
	{ 0x004b,	"SNA over 802.2" },
	{ 0x004d,	"SNA" },
	{ 0x004f,	"IPv6 Header Compression" },
	{ 0x0051,	"KNX Bridging Data" },
	{ 0x0053,	"Encryption" },
	{ 0x0055,	"Individual Link Encryption" },
	{ 0x0057,	"Internet Protocol version 6" },
	{ 0x0059,	"PPP Muxing" },
	{ 0x0061,	"RTP IPHC Full Header" },
	{ 0x0063,	"RTP IPHC Compressed TCP" },
	{ 0x0065,	"RTP IPHC Compressed Non TCP" },
	{ 0x0067,	"RTP IPHC Compressed UDP 8" },
	{ 0x0069,	"RTP IPHC Compressed RTP 8" },
	{ 0x006f,	"Stampede Bridging" },
	{ 0x0071,	"Reserved" },
	{ 0x0073,	"MP+ Protocol" },
	{ 0x007d,	"reserved (Control Escape)" },
	{ 0x007f,	"reserved (compression inefficient)" },
	{ 0x0081,	"Reserved Until 20-Oct-2000" },
	{ 0x0083,	"Reserved Until 20-Oct-2000" },
	{ 0x00c1,	"NTCITS IPI" },
	{ 0x00cf,	"reserved (PPP NLPID)" },
	{ 0x00fb,	"single link compression in multilink" },
	{ 0x00fd,	"compressed datagram" },
	{ 0x00ff,	"reserved (compression inefficient)" },
	{ 0x0201,	"802.1d Hello Packets" },
	{ 0x0203,	"IBM Source Routing BPDU" },
	{ 0x0205,	"DEC LANBridge100 Spanning Tree" },
	{ 0x0207,	"Cisco Discovery Protocol" },
	{ 0x0209,	"Netcs Twin Routing" },
	{ 0x020b,	"STP - Scheduled Transfer Protocol" },
	{ 0x020d,	"EDP - Extreme Discovery Protocol" },
	{ 0x0211,	"Optical Supervisory Channel Protocol (OSCP)" },
	{ 0x0213,	"Optical Supervisory Channel Protocol (OSCP)" },
	{ 0x0231,	"Luxcom" },
	{ 0x0233,	"Sigma Network Systems" },
	{ 0x0235,	"Apple Client Server Protocol" },
	{ 0x0281,	"MPLS Unicast" },
	{ 0x0283,	"MPLS Multicast" },
	{ 0x0285,	"IEEE p1284.4 standard - data packets" },
	{ 0x0287,	"ETSI TETRA Network Protocol Type 1" },
	{ 0x0289,	"Multichannel Flow Treatment Protocol" },
	{ 0x2063,	"RTP IPHC Compressed TCP No Delta" },
	{ 0x2065,	"RTP IPHC Context State" },
	{ 0x2067,	"RTP IPHC Compressed UDP 16" },
	{ 0x2069,	"RTP IPHC Compressed RTP 16" },
	{ 0x4001,	"Cray Communications Control Protocol" },
	{ 0x4003,	"CDPD Mobile Network Registration Protocol" },
	{ 0x4005,	"Expand accelerator dllcol" },
	{ 0x4007,	"ODSICP NCP" },
	{ 0x4009,	"DOCSIS DLL" },
	{ 0x4021,	"Stacker LZS" },
	{ 0x4023,	"RefTek Protocol" },
	{ 0x4025,	"Fibre Channel" },
	{ 0x4027,	"EMIT Protocols" },
	{ 0x8021,	"Internet Protocol Control Protocol" },
	{ 0x8023,	"OSI Network Layer Control Protocol" },
	{ 0x8025,	"Xerox NS IDP Control Protocol" },
	{ 0x8027,	"DECnet Phase IV Control Protocol" },
	{ 0x8029,	"Appletalk Control Protocol" },
	{ 0x802b,	"Novell IPX Control Protocol" },
	{ 0x802d,	"reserved" },
	{ 0x802f,	"reserved" },
	{ 0x8031,	"Bridging NCP" },
	{ 0x8033,	"Stream Protocol Control Protocol" },
	{ 0x8035,	"Banyan Vines Control Protocol" },
	{ 0x8037,	"reserved (until 1993)" },
	{ 0x8039,	"reserved" },
	{ 0x803b,	"reserved" },
	{ 0x803d,	"Multi-Link Control Protocol" },
	{ 0x803f,	"NETBIOS Framing Control Protocol" },
	{ 0x8041,	"Cisco Systems Control Protocol" },
	{ 0x8043,	"Ascom Timeplex" },
	{ 0x8045,	"Fujitsu LBLB Control Protocol" },
	{ 0x8047,	"DCA Remote Lan Network Control Protocol (RLNCP)" },
	{ 0x8049,	"Serial Data Control Protocol (PPP-SDCP)" },
	{ 0x804b,	"SNA over 802.2 Control Protocol" },
	{ 0x804d,	"SNA Control Protocol" },
	{ 0x804f,	"IP6 Header Compression Control Protocol" },
	{ 0x8051,	"KNX Bridging Control Protocol" },
	{ 0x8053,	"Encryption Control Protocol" },
	{ 0x8055,	"Individual Link Encryption Control Protocol" },
	{ 0x8057,	"IPv6 Control Protovol" },
	{ 0x8059,	"PPP Muxing Control Protocol" },
	{ 0x806f,	"Stampede Bridging Control Protocol" },
	{ 0x8073,	"MP+ Control Protocol" },
	{ 0x8071,	"Reserved" },
	{ 0x807d,	"Not Used - reserved" },
	{ 0x8081,	"Reserved Until 20-Oct-2000" },
	{ 0x8083,	"Reserved Until 20-Oct-2000" },
	{ 0x80c1,	"NTCITS IPI Control Protocol" },
	{ 0x80cf,	"Not Used - reserved" },
	{ 0x80fb,	"single link compression in multilink control" },
	{ 0x80fd,	"Compression Control Protocol" },
	{ 0x80ff,	"Not Used - reserved" },
	{ 0x8207,	"Cisco Discovery Protocol Control" },
	{ 0x8209,	"Netcs Twin Routing" },
	{ 0x820b,	"STP - Control Protocol" },
	{ 0x820d,	"EDPCP - Extreme Discovery Protocol Ctrl Prtcl" },
	{ 0x8235,	"Apple Client Server Protocol Control" },
	{ 0x8281,	"MPLSCP" },
	{ 0x8285,	"IEEE p1284.4 standard - Protocol Control" },
	{ 0x8287,	"ETSI TETRA TNP1 Control Protocol" },
	{ 0x8289,	"Multichannel Flow Treatment Protocol" },
	{ 0xc021,	"Link Control Protocol" },
	{ 0xc023,	"Password Authentication Protocol" },
	{ 0xc025,	"Link Quality Report" },
	{ 0xc027,	"Shiva Password Authentication Protocol" },
	{ 0xc029,	"CallBack Control Protocol (CBCP)" },
	{ 0xc02b,	"BACP Bandwidth Allocation Control Protocol" },
	{ 0xc02d,	"BAP" },
	{ 0xc081,	"Container Control Protocol" },
	{ 0xc223,	"Challenge Handshake Authentication Protocol" },
	{ 0xc225,	"RSA Authentication Protocol" },
	{ 0xc227,	"Extensible Authentication Protocol" },
	{ 0xc229,	"Mitsubishi Security Info Exch Ptcl (SIEP)" },
	{ 0xc26f,	"Stampede Bridging Authorization Protocol" },
	{ 0xc281,	"Proprietary Authentication Protocol" },
	{ 0xc283,	"Proprietary Authentication Protocol" },
	{ 0xc481,	"Proprietary Node ID Authentication Protocol" },
	{ -1,		"?" }
};


/* 
 * FCS lookup table as calculated by genfcstab.
 */
static unsigned short fcstab[256] = {
	0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
	0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
	0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
	0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
	0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
	0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
	0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
	0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
	0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
	0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
	0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
	0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
	0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
	0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
	0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
	0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
	0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
	0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
	0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
	0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
	0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
	0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
	0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
	0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
	0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
	0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
	0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
	0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
	0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
	0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
	0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
	0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

tab_t Lcpvals[] = {
	{ 0,	"      Vendor specific\n" },
	{ 1,	"      mtu=%d\n" },
	{ 2,	"      async char map=0x%lx\n"},
	{ 3,	"      authentication proto='%t'\n",		Protocols },
	{ 4,	"      monitoring  proto='%t'\n",		Protocols },
	{ 5,	"      magic=0x%lx\n"},
	{ 7,	"      Enabled\n" },
	{ 8,	"      Enabled\n" },
	{ 9,	"      FCS type='%bt'\n",			Fcsopts },
	{ 10,	"      padding length=%bd\n" },
	{ 11,	"      callback type='%bt'\n"
		"      callback msg='%s'\n",			Callback },
	{ 13,	"      number='%bt'\n\n",			Callback },
	{ 15,	"      Enabled\n" },
	{ -1,	"      ?" }
};

tab_t Ipcpvals[] = {
	{ 0,	"      Vendor specific\n" },
	{ 1,	"      %bd.%bd.%bd.%bd\n"
		"      %bd.%bd.%bd.%bd\n" },
	{ 2,	"      proto='%t'\n"
		"      max slot id=%bd\n"
		"      comp slot id=%bd\n",			Protocols },
	{ 3,	"      %bd.%bd.%bd.%bd\n" },
	{ 4,	"      %bd.%bd.%bd.%bd\n" },
	{ 129,	"      %bd.%bd.%bd.%bd\n" },
	{ 130,	"      %bd.%bd.%bd.%bd\n" },
	{ 131,	"      %bd.%bd.%bd.%bd\n" },
	{ 132,	"      %bd.%bd.%bd.%bd\n" },
	{ -1,	"      ?" }
};


/* These values are bitmapped so other combinations are possable */
tab_t Mppvals[] = {
	{ 0,	"Macintosh ?\n" },
	{ 1,	"Compression only"},
	{ 0x20,	"40bit key encryption"},
	{ 0x21,	"Compression & 40bit key encryption"},
	{ 0x40,	"128bit key encryption"},
	{ 0x41,	"Compression & 56bit key encryption"},
	{ 0x80,	"128bit key encryption"},
	{ 0x81,	"Compression & 56bit key encryption"},
	{ 0x1000, "dynamic key encryption"},
	{ 0x1001, "Compression & dynamic key encryption"},
};

tab_t Ccpvals[] = {
	{ 17,	"      Hist count=%wd\n"
		"      check mode=0x%bx\n" },					/* Stac Electronics LZS */
	{ 18,	"      bitmask='%lt'\n",			Mppvals },	/* Microsoft PPC */
	{ -1,	"      ?" }
};