Adding upstream version 4.99.3.upstream/4.99.3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1897 insertions, 0 deletions

diff --git a/print-ppp.c b/print-ppp.c
new file mode 100644
index 0000000..aba243d
--- /dev/null
+++ b/print-ppp.c
@@ -0,0 +1,1897 @@
+/*
+ * Copyright (c) 1990, 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.
+ *
+ * Extensively modified by Motonori Shindo (mshindo@mshindo.net) for more
+ * complete PPP support.
+ */
+
+/* \summary: Point to Point Protocol (PPP) printer */
+
+/*
+ * TODO:
+ * o resolve XXX as much as possible
+ * o MP support
+ * o BAP support
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#ifdef __bsdi__
+#include <net/slcompress.h>
+#include <net/if_ppp.h>
+#endif
+
+#include "netdissect.h"
+#include "extract.h"
+#include "addrtoname.h"
+#include "ppp.h"
+#include "chdlc.h"
+#include "ethertype.h"
+#include "oui.h"
+#include "netdissect-alloc.h"
+
+/*
+ * The following constants are defined by IANA. Please refer to
+ *    https://www.isi.edu/in-notes/iana/assignments/ppp-numbers
+ * for the up-to-date information.
+ */
+
+/* Protocol Codes defined in ppp.h */
+
+static const struct tok ppptype2str[] = {
+        { PPP_IP,	  "IP" },
+        { PPP_OSI,	  "OSI" },
+        { PPP_NS,	  "NS" },
+        { PPP_DECNET,	  "DECNET" },
+        { PPP_APPLE,	  "APPLE" },
+	{ PPP_IPX,	  "IPX" },
+	{ PPP_VJC,	  "VJC IP" },
+	{ PPP_VJNC,	  "VJNC IP" },
+	{ PPP_BRPDU,	  "BRPDU" },
+	{ PPP_STII,	  "STII" },
+	{ PPP_VINES,	  "VINES" },
+	{ PPP_MPLS_UCAST, "MPLS" },
+	{ PPP_MPLS_MCAST, "MPLS" },
+        { PPP_COMP,       "Compressed"},
+        { PPP_ML,         "MLPPP"},
+        { PPP_IPV6,       "IP6"},
+
+	{ PPP_HELLO,	  "HELLO" },
+	{ PPP_LUXCOM,	  "LUXCOM" },
+	{ PPP_SNS,	  "SNS" },
+	{ PPP_IPCP,	  "IPCP" },
+	{ PPP_OSICP,	  "OSICP" },
+	{ PPP_NSCP,	  "NSCP" },
+	{ PPP_DECNETCP,   "DECNETCP" },
+	{ PPP_APPLECP,	  "APPLECP" },
+	{ PPP_IPXCP,	  "IPXCP" },
+	{ PPP_STIICP,	  "STIICP" },
+	{ PPP_VINESCP,	  "VINESCP" },
+        { PPP_IPV6CP,     "IP6CP" },
+	{ PPP_MPLSCP,	  "MPLSCP" },
+
+	{ PPP_LCP,	  "LCP" },
+	{ PPP_PAP,	  "PAP" },
+	{ PPP_LQM,	  "LQM" },
+	{ PPP_CHAP,	  "CHAP" },
+	{ PPP_EAP,	  "EAP" },
+	{ PPP_SPAP,	  "SPAP" },
+	{ PPP_SPAP_OLD,	  "Old-SPAP" },
+	{ PPP_BACP,	  "BACP" },
+	{ PPP_BAP,	  "BAP" },
+	{ PPP_MPCP,	  "MLPPP-CP" },
+	{ PPP_CCP,	  "CCP" },
+	{ 0,		  NULL }
+};
+
+/* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */
+
+#define CPCODES_VEXT		0	/* Vendor-Specific (RFC2153) */
+#define CPCODES_CONF_REQ	1	/* Configure-Request */
+#define CPCODES_CONF_ACK	2	/* Configure-Ack */
+#define CPCODES_CONF_NAK	3	/* Configure-Nak */
+#define CPCODES_CONF_REJ	4	/* Configure-Reject */
+#define CPCODES_TERM_REQ	5	/* Terminate-Request */
+#define CPCODES_TERM_ACK	6	/* Terminate-Ack */
+#define CPCODES_CODE_REJ	7	/* Code-Reject */
+#define CPCODES_PROT_REJ	8	/* Protocol-Reject (LCP only) */
+#define CPCODES_ECHO_REQ	9	/* Echo-Request (LCP only) */
+#define CPCODES_ECHO_RPL	10	/* Echo-Reply (LCP only) */
+#define CPCODES_DISC_REQ	11	/* Discard-Request (LCP only) */
+#define CPCODES_ID		12	/* Identification (LCP only) RFC1570 */
+#define CPCODES_TIME_REM	13	/* Time-Remaining (LCP only) RFC1570 */
+#define CPCODES_RESET_REQ	14	/* Reset-Request (CCP only) RFC1962 */
+#define CPCODES_RESET_REP	15	/* Reset-Reply (CCP only) */
+
+static const struct tok cpcodes[] = {
+	{CPCODES_VEXT,      "Vendor-Extension"}, /* RFC2153 */
+	{CPCODES_CONF_REQ,  "Conf-Request"},
+        {CPCODES_CONF_ACK,  "Conf-Ack"},
+	{CPCODES_CONF_NAK,  "Conf-Nack"},
+	{CPCODES_CONF_REJ,  "Conf-Reject"},
+	{CPCODES_TERM_REQ,  "Term-Request"},
+	{CPCODES_TERM_ACK,  "Term-Ack"},
+	{CPCODES_CODE_REJ,  "Code-Reject"},
+	{CPCODES_PROT_REJ,  "Prot-Reject"},
+	{CPCODES_ECHO_REQ,  "Echo-Request"},
+	{CPCODES_ECHO_RPL,  "Echo-Reply"},
+	{CPCODES_DISC_REQ,  "Disc-Req"},
+	{CPCODES_ID,        "Ident"},            /* RFC1570 */
+	{CPCODES_TIME_REM,  "Time-Rem"},         /* RFC1570 */
+	{CPCODES_RESET_REQ, "Reset-Req"},        /* RFC1962 */
+	{CPCODES_RESET_REP, "Reset-Ack"},        /* RFC1962 */
+        {0,                 NULL}
+};
+
+/* LCP Config Options */
+
+#define LCPOPT_VEXT	0
+#define LCPOPT_MRU	1
+#define LCPOPT_ACCM	2
+#define LCPOPT_AP	3
+#define LCPOPT_QP	4
+#define LCPOPT_MN	5
+#define LCPOPT_DEP6	6
+#define LCPOPT_PFC	7
+#define LCPOPT_ACFC	8
+#define LCPOPT_FCSALT	9
+#define LCPOPT_SDP	10
+#define LCPOPT_NUMMODE	11
+#define LCPOPT_DEP12	12
+#define LCPOPT_CBACK	13
+#define LCPOPT_DEP14	14
+#define LCPOPT_DEP15	15
+#define LCPOPT_DEP16	16
+#define LCPOPT_MLMRRU	17
+#define LCPOPT_MLSSNHF	18
+#define LCPOPT_MLED	19
+#define LCPOPT_PROP	20
+#define LCPOPT_DCEID	21
+#define LCPOPT_MPP	22
+#define LCPOPT_LD	23
+#define LCPOPT_LCPAOPT	24
+#define LCPOPT_COBS	25
+#define LCPOPT_PE	26
+#define LCPOPT_MLHF	27
+#define LCPOPT_I18N	28
+#define LCPOPT_SDLOS	29
+#define LCPOPT_PPPMUX	30
+
+static const char *lcpconfopts[] = {
+	"Vend-Ext",		/* (0) */
+	"MRU",			/* (1) */
+	"ACCM",			/* (2) */
+	"Auth-Prot",		/* (3) */
+	"Qual-Prot",		/* (4) */
+	"Magic-Num",		/* (5) */
+	"deprecated(6)",	/* used to be a Quality Protocol */
+	"PFC",			/* (7) */
+	"ACFC",			/* (8) */
+	"FCS-Alt",		/* (9) */
+	"SDP",			/* (10) */
+	"Num-Mode",		/* (11) */
+	"deprecated(12)",	/* used to be a Multi-Link-Procedure*/
+	"Call-Back",		/* (13) */
+	"deprecated(14)",	/* used to be a Connect-Time */
+	"deprecated(15)",	/* used to be a Compund-Frames */
+	"deprecated(16)",	/* used to be a Nominal-Data-Encap */
+	"MRRU",			/* (17) */
+	"12-Bit seq #",		/* (18) */
+	"End-Disc",		/* (19) */
+	"Proprietary",		/* (20) */
+	"DCE-Id",		/* (21) */
+	"MP+",			/* (22) */
+	"Link-Disc",		/* (23) */
+	"LCP-Auth-Opt",		/* (24) */
+	"COBS",			/* (25) */
+	"Prefix-elision",	/* (26) */
+	"Multilink-header-Form",/* (27) */
+	"I18N",			/* (28) */
+	"SDL-over-SONET/SDH",	/* (29) */
+	"PPP-Muxing",		/* (30) */
+};
+
+#define NUM_LCPOPTS	(sizeof(lcpconfopts) / sizeof(lcpconfopts[0]))
+
+/* ECP - to be supported */
+
+/* CCP Config Options */
+
+#define CCPOPT_OUI	0	/* RFC1962 */
+#define CCPOPT_PRED1	1	/* RFC1962 */
+#define CCPOPT_PRED2	2	/* RFC1962 */
+#define CCPOPT_PJUMP	3	/* RFC1962 */
+/* 4-15 unassigned */
+#define CCPOPT_HPPPC	16	/* RFC1962 */
+#define CCPOPT_STACLZS	17	/* RFC1974 */
+#define CCPOPT_MPPC	18	/* RFC2118 */
+#define CCPOPT_GFZA	19	/* RFC1962 */
+#define CCPOPT_V42BIS	20	/* RFC1962 */
+#define CCPOPT_BSDCOMP	21	/* RFC1977 */
+/* 22 unassigned */
+#define CCPOPT_LZSDCP	23	/* RFC1967 */
+#define CCPOPT_MVRCA	24	/* RFC1975 */
+#define CCPOPT_DEC	25	/* RFC1976 */
+#define CCPOPT_DEFLATE	26	/* RFC1979 */
+/* 27-254 unassigned */
+#define CCPOPT_RESV	255	/* RFC1962 */
+
+static const struct tok ccpconfopts_values[] = {
+        { CCPOPT_OUI, "OUI" },
+        { CCPOPT_PRED1, "Pred-1" },
+        { CCPOPT_PRED2, "Pred-2" },
+        { CCPOPT_PJUMP, "Puddle" },
+        { CCPOPT_HPPPC, "HP-PPC" },
+        { CCPOPT_STACLZS, "Stac-LZS" },
+        { CCPOPT_MPPC, "MPPC" },
+        { CCPOPT_GFZA, "Gand-FZA" },
+        { CCPOPT_V42BIS, "V.42bis" },
+        { CCPOPT_BSDCOMP, "BSD-Comp" },
+        { CCPOPT_LZSDCP, "LZS-DCP" },
+        { CCPOPT_MVRCA, "MVRCA" },
+        { CCPOPT_DEC, "DEC" },
+        { CCPOPT_DEFLATE, "Deflate" },
+        { CCPOPT_RESV, "Reserved"},
+        {0,                 NULL}
+};
+
+/* BACP Config Options */
+
+#define BACPOPT_FPEER	1	/* RFC2125 */
+
+static const struct tok bacconfopts_values[] = {
+        { BACPOPT_FPEER, "Favored-Peer" },
+        {0,                 NULL}
+};
+
+
+/* SDCP - to be supported */
+
+/* IPCP Config Options */
+#define IPCPOPT_2ADDR	1	/* RFC1172, RFC1332 (deprecated) */
+#define IPCPOPT_IPCOMP	2	/* RFC1332 */
+#define IPCPOPT_ADDR	3	/* RFC1332 */
+#define IPCPOPT_MOBILE4	4	/* RFC2290 */
+#define IPCPOPT_PRIDNS	129	/* RFC1877 */
+#define IPCPOPT_PRINBNS	130	/* RFC1877 */
+#define IPCPOPT_SECDNS	131	/* RFC1877 */
+#define IPCPOPT_SECNBNS	132	/* RFC1877 */
+
+static const struct tok ipcpopt_values[] = {
+        { IPCPOPT_2ADDR, "IP-Addrs" },
+        { IPCPOPT_IPCOMP, "IP-Comp" },
+        { IPCPOPT_ADDR, "IP-Addr" },
+        { IPCPOPT_MOBILE4, "Home-Addr" },
+        { IPCPOPT_PRIDNS, "Pri-DNS" },
+        { IPCPOPT_PRINBNS, "Pri-NBNS" },
+        { IPCPOPT_SECDNS, "Sec-DNS" },
+        { IPCPOPT_SECNBNS, "Sec-NBNS" },
+	{ 0,		  NULL }
+};
+
+#define IPCPOPT_IPCOMP_HDRCOMP 0x61  /* rfc3544 */
+#define IPCPOPT_IPCOMP_MINLEN    14
+
+static const struct tok ipcpopt_compproto_values[] = {
+        { PPP_VJC, "VJ-Comp" },
+        { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" },
+	{ 0,		  NULL }
+};
+
+static const struct tok ipcpopt_compproto_subopt_values[] = {
+        { 1, "RTP-Compression" },
+        { 2, "Enhanced RTP-Compression" },
+	{ 0,		  NULL }
+};
+
+/* IP6CP Config Options */
+#define IP6CP_IFID      1
+
+static const struct tok ip6cpopt_values[] = {
+        { IP6CP_IFID, "Interface-ID" },
+	{ 0,		  NULL }
+};
+
+/* ATCP - to be supported */
+/* OSINLCP - to be supported */
+/* BVCP - to be supported */
+/* BCP - to be supported */
+/* IPXCP - to be supported */
+/* MPLSCP - to be supported */
+
+/* Auth Algorithms */
+
+/* 0-4 Reserved (RFC1994) */
+#define AUTHALG_CHAPMD5	5	/* RFC1994 */
+#define AUTHALG_MSCHAP1	128	/* RFC2433 */
+#define AUTHALG_MSCHAP2	129	/* RFC2795 */
+
+static const struct tok authalg_values[] = {
+        { AUTHALG_CHAPMD5, "MD5" },
+        { AUTHALG_MSCHAP1, "MS-CHAPv1" },
+        { AUTHALG_MSCHAP2, "MS-CHAPv2" },
+	{ 0,		  NULL }
+};
+
+/* FCS Alternatives - to be supported */
+
+/* Multilink Endpoint Discriminator (RFC1717) */
+#define MEDCLASS_NULL	0	/* Null Class */
+#define MEDCLASS_LOCAL	1	/* Locally Assigned */
+#define MEDCLASS_IPV4	2	/* Internet Protocol (IPv4) */
+#define MEDCLASS_MAC	3	/* IEEE 802.1 global MAC address */
+#define MEDCLASS_MNB	4	/* PPP Magic Number Block */
+#define MEDCLASS_PSNDN	5	/* Public Switched Network Director Number */
+
+/* PPP LCP Callback */
+#define CALLBACK_AUTH	0	/* Location determined by user auth */
+#define CALLBACK_DSTR	1	/* Dialing string */
+#define CALLBACK_LID	2	/* Location identifier */
+#define CALLBACK_E164	3	/* E.164 number */
+#define CALLBACK_X500	4	/* X.500 distinguished name */
+#define CALLBACK_CBCP	6	/* Location is determined during CBCP nego */
+
+static const struct tok ppp_callback_values[] = {
+        { CALLBACK_AUTH, "UserAuth" },
+        { CALLBACK_DSTR, "DialString" },
+        { CALLBACK_LID, "LocalID" },
+        { CALLBACK_E164, "E.164" },
+        { CALLBACK_X500, "X.500" },
+        { CALLBACK_CBCP, "CBCP" },
+	{ 0,		  NULL }
+};
+
+/* CHAP */
+
+#define CHAP_CHAL	1
+#define CHAP_RESP	2
+#define CHAP_SUCC	3
+#define CHAP_FAIL	4
+
+static const struct tok chapcode_values[] = {
+	{ CHAP_CHAL, "Challenge" },
+	{ CHAP_RESP, "Response" },
+	{ CHAP_SUCC, "Success" },
+	{ CHAP_FAIL, "Fail" },
+        { 0, NULL}
+};
+
+/* PAP */
+
+#define PAP_AREQ	1
+#define PAP_AACK	2
+#define PAP_ANAK	3
+
+static const struct tok papcode_values[] = {
+        { PAP_AREQ, "Auth-Req" },
+        { PAP_AACK, "Auth-ACK" },
+        { PAP_ANAK, "Auth-NACK" },
+        { 0, NULL }
+};
+
+/* BAP */
+#define BAP_CALLREQ	1
+#define BAP_CALLRES	2
+#define BAP_CBREQ	3
+#define BAP_CBRES	4
+#define BAP_LDQREQ	5
+#define BAP_LDQRES	6
+#define BAP_CSIND	7
+#define BAP_CSRES	8
+
+static u_int print_lcp_config_options(netdissect_options *, const u_char *p, u_int);
+static u_int print_ipcp_config_options(netdissect_options *, const u_char *p, u_int);
+static u_int print_ip6cp_config_options(netdissect_options *, const u_char *p, u_int);
+static u_int print_ccp_config_options(netdissect_options *, const u_char *p, u_int);
+static u_int print_bacp_config_options(netdissect_options *, const u_char *p, u_int);
+static void handle_ppp(netdissect_options *, u_int proto, const u_char *p, u_int length);
+
+/* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */
+static void
+handle_ctrl_proto(netdissect_options *ndo,
+                  u_int proto, const u_char *pptr, u_int length)
+{
+	const char *typestr;
+	u_int code, len;
+	u_int (*pfunc)(netdissect_options *, const u_char *, u_int);
+	u_int tlen, advance;
+        const u_char *tptr;
+
+        tptr=pptr;
+
+        typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto);
+	ND_PRINT("%s, ", typestr);
+
+	if (length < 4) /* FIXME weak boundary checking */
+		goto trunc;
+	ND_TCHECK_2(tptr);
+
+	code = GET_U_1(tptr);
+	tptr++;
+
+	ND_PRINT("%s (0x%02x), id %u, length %u",
+	          tok2str(cpcodes, "Unknown Opcode",code),
+	          code,
+	          GET_U_1(tptr), /* ID */
+	          length + 2);
+	tptr++;
+
+	if (!ndo->ndo_vflag)
+		return;
+
+	len = GET_BE_U_2(tptr);
+	tptr += 2;
+
+	if (len < 4) {
+		ND_PRINT("\n\tencoded length %u (< 4))", len);
+		return;
+	}
+
+	if (len > length) {
+		ND_PRINT("\n\tencoded length %u (> packet length %u))", len, length);
+		return;
+	}
+	length = len;
+
+	ND_PRINT("\n\tencoded length %u (=Option(s) length %u)", len, len - 4);
+
+	if (length == 4)
+		return;    /* there may be a NULL confreq etc. */
+
+	if (ndo->ndo_vflag > 1)
+		print_unknown_data(ndo, pptr - 2, "\n\t", 6);
+
+
+	switch (code) {
+	case CPCODES_VEXT:
+		if (length < 11)
+			break;
+		ND_PRINT("\n\t  Magic-Num 0x%08x", GET_BE_U_4(tptr));
+		tptr += 4;
+		ND_PRINT(" Vendor: %s (%u)",
+                       tok2str(oui_values,"Unknown",GET_BE_U_3(tptr)),
+                       GET_BE_U_3(tptr));
+		/* XXX: need to decode Kind and Value(s)? */
+		break;
+	case CPCODES_CONF_REQ:
+	case CPCODES_CONF_ACK:
+	case CPCODES_CONF_NAK:
+	case CPCODES_CONF_REJ:
+		tlen = len - 4;	/* Code(1), Identifier(1) and Length(2) */
+		do {
+			switch (proto) {
+			case PPP_LCP:
+				pfunc = print_lcp_config_options;
+				break;
+			case PPP_IPCP:
+				pfunc = print_ipcp_config_options;
+				break;
+			case PPP_IPV6CP:
+				pfunc = print_ip6cp_config_options;
+				break;
+			case PPP_CCP:
+				pfunc = print_ccp_config_options;
+				break;
+			case PPP_BACP:
+				pfunc = print_bacp_config_options;
+				break;
+			default:
+				/*
+				 * No print routine for the options for
+				 * this protocol.
+				 */
+				pfunc = NULL;
+				break;
+			}
+
+			if (pfunc == NULL) /* catch the above null pointer if unknown CP */
+				break;
+
+			if ((advance = (*pfunc)(ndo, tptr, len)) == 0)
+				break;
+			if (tlen < advance) {
+				ND_PRINT(" [remaining options length %u < %u]",
+					 tlen, advance);
+				nd_print_invalid(ndo);
+				break;
+			}
+			tlen -= advance;
+			tptr += advance;
+		} while (tlen != 0);
+		break;
+
+	case CPCODES_TERM_REQ:
+	case CPCODES_TERM_ACK:
+		/* XXX: need to decode Data? */
+		break;
+	case CPCODES_CODE_REJ:
+		/* XXX: need to decode Rejected-Packet? */
+		break;
+	case CPCODES_PROT_REJ:
+		if (length < 6)
+			break;
+		ND_PRINT("\n\t  Rejected %s Protocol (0x%04x)",
+		       tok2str(ppptype2str,"unknown", GET_BE_U_2(tptr)),
+		       GET_BE_U_2(tptr));
+		/* XXX: need to decode Rejected-Information? - hexdump for now */
+		if (len > 6) {
+			ND_PRINT("\n\t  Rejected Packet");
+			print_unknown_data(ndo, tptr + 2, "\n\t    ", len - 2);
+		}
+		break;
+	case CPCODES_ECHO_REQ:
+	case CPCODES_ECHO_RPL:
+	case CPCODES_DISC_REQ:
+		if (length < 8)
+			break;
+		ND_PRINT("\n\t  Magic-Num 0x%08x", GET_BE_U_4(tptr));
+		/* XXX: need to decode Data? - hexdump for now */
+		if (len > 8) {
+			ND_PRINT("\n\t  -----trailing data-----");
+			ND_TCHECK_LEN(tptr + 4, len - 8);
+			print_unknown_data(ndo, tptr + 4, "\n\t  ", len - 8);
+		}
+		break;
+	case CPCODES_ID:
+		if (length < 8)
+			break;
+		ND_PRINT("\n\t  Magic-Num 0x%08x", GET_BE_U_4(tptr));
+		/* RFC 1661 says this is intended to be human readable */
+		if (len > 8) {
+			ND_PRINT("\n\t  Message\n\t    ");
+			if (nd_printn(ndo, tptr + 4, len - 4, ndo->ndo_snapend))
+				goto trunc;
+		}
+		break;
+	case CPCODES_TIME_REM:
+		if (length < 12)
+			break;
+		ND_PRINT("\n\t  Magic-Num 0x%08x", GET_BE_U_4(tptr));
+		ND_PRINT(", Seconds-Remaining %us", GET_BE_U_4(tptr + 4));
+		/* XXX: need to decode Message? */
+		break;
+	default:
+		/* XXX this is dirty but we do not get the
+		 * original pointer passed to the begin
+		 * the PPP packet */
+		if (ndo->ndo_vflag <= 1)
+			print_unknown_data(ndo, pptr - 2, "\n\t  ", length + 2);
+		break;
+	}
+	return;
+
+trunc:
+	ND_PRINT("[|%s]", typestr);
+}
+
+/* LCP config options */
+static u_int
+print_lcp_config_options(netdissect_options *ndo,
+                         const u_char *p, u_int length)
+{
+	u_int opt, len;
+
+	if (length < 2)
+		return 0;
+	ND_TCHECK_2(p);
+	opt = GET_U_1(p);
+	len = GET_U_1(p + 1);
+	if (length < len)
+		return 0;
+	if (len < 2) {
+		if (opt < NUM_LCPOPTS)
+			ND_PRINT("\n\t  %s Option (0x%02x), length %u (length bogus, should be >= 2)",
+			          lcpconfopts[opt], opt, len);
+		else
+			ND_PRINT("\n\tunknown LCP option 0x%02x", opt);
+		return 0;
+	}
+	if (opt < NUM_LCPOPTS)
+		ND_PRINT("\n\t  %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len);
+	else {
+		ND_PRINT("\n\tunknown LCP option 0x%02x", opt);
+		return len;
+	}
+
+	switch (opt) {
+	case LCPOPT_VEXT:
+		if (len < 6) {
+			ND_PRINT(" (length bogus, should be >= 6)");
+			return len;
+		}
+		ND_PRINT(": Vendor: %s (%u)",
+			tok2str(oui_values,"Unknown",GET_BE_U_3(p + 2)),
+			GET_BE_U_3(p + 2));
+#if 0
+		ND_PRINT(", kind: 0x%02x", GET_U_1(p + 5));
+		ND_PRINT(", Value: 0x");
+		for (i = 0; i < len - 6; i++) {
+			ND_PRINT("%02x", GET_U_1(p + 6 + i));
+		}
+#endif
+		break;
+	case LCPOPT_MRU:
+		if (len != 4) {
+			ND_PRINT(" (length bogus, should be = 4)");
+			return len;
+		}
+		ND_PRINT(": %u", GET_BE_U_2(p + 2));
+		break;
+	case LCPOPT_ACCM:
+		if (len != 6) {
+			ND_PRINT(" (length bogus, should be = 6)");
+			return len;
+		}
+		ND_PRINT(": 0x%08x", GET_BE_U_4(p + 2));
+		break;
+	case LCPOPT_AP:
+		if (len < 4) {
+			ND_PRINT(" (length bogus, should be >= 4)");
+			return len;
+		}
+		ND_PRINT(": %s",
+			 tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", GET_BE_U_2(p + 2)));
+
+		switch (GET_BE_U_2(p + 2)) {
+		case PPP_CHAP:
+			ND_PRINT(", %s",
+				 tok2str(authalg_values, "Unknown Auth Alg %u", GET_U_1(p + 4)));
+			break;
+		case PPP_PAP: /* fall through */
+		case PPP_EAP:
+		case PPP_SPAP:
+		case PPP_SPAP_OLD:
+                        break;
+		default:
+			print_unknown_data(ndo, p, "\n\t", len);
+		}
+		break;
+	case LCPOPT_QP:
+		if (len < 4) {
+			ND_PRINT(" (length bogus, should be >= 4)");
+			return 0;
+		}
+		if (GET_BE_U_2(p + 2) == PPP_LQM)
+			ND_PRINT(": LQR");
+		else
+			ND_PRINT(": unknown");
+		break;
+	case LCPOPT_MN:
+		if (len != 6) {
+			ND_PRINT(" (length bogus, should be = 6)");
+			return 0;
+		}
+		ND_PRINT(": 0x%08x", GET_BE_U_4(p + 2));
+		break;
+	case LCPOPT_PFC:
+		break;
+	case LCPOPT_ACFC:
+		break;
+	case LCPOPT_LD:
+		if (len != 4) {
+			ND_PRINT(" (length bogus, should be = 4)");
+			return 0;
+		}
+		ND_PRINT(": 0x%04x", GET_BE_U_2(p + 2));
+		break;
+	case LCPOPT_CBACK:
+		if (len < 3) {
+			ND_PRINT(" (length bogus, should be >= 3)");
+			return 0;
+		}
+		ND_PRINT(": ");
+		ND_PRINT(": Callback Operation %s (%u)",
+                       tok2str(ppp_callback_values, "Unknown", GET_U_1(p + 2)),
+                       GET_U_1(p + 2));
+		break;
+	case LCPOPT_MLMRRU:
+		if (len != 4) {
+			ND_PRINT(" (length bogus, should be = 4)");
+			return 0;
+		}
+		ND_PRINT(": %u", GET_BE_U_2(p + 2));
+		break;
+	case LCPOPT_MLED:
+		if (len < 3) {
+			ND_PRINT(" (length bogus, should be >= 3)");
+			return 0;
+		}
+		switch (GET_U_1(p + 2)) {		/* class */
+		case MEDCLASS_NULL:
+			ND_PRINT(": Null");
+			break;
+		case MEDCLASS_LOCAL:
+			ND_PRINT(": Local"); /* XXX */
+			break;
+		case MEDCLASS_IPV4:
+			if (len != 7) {
+				ND_PRINT(" (length bogus, should be = 7)");
+				return 0;
+			}
+			ND_PRINT(": IPv4 %s", GET_IPADDR_STRING(p + 3));
+			break;
+		case MEDCLASS_MAC:
+			if (len != 9) {
+				ND_PRINT(" (length bogus, should be = 9)");
+				return 0;
+			}
+			ND_PRINT(": MAC %s", GET_ETHERADDR_STRING(p + 3));
+			break;
+		case MEDCLASS_MNB:
+			ND_PRINT(": Magic-Num-Block"); /* XXX */
+			break;
+		case MEDCLASS_PSNDN:
+			ND_PRINT(": PSNDN"); /* XXX */
+			break;
+		default:
+			ND_PRINT(": Unknown class %u", GET_U_1(p + 2));
+			break;
+		}
+		break;
+
+/* XXX: to be supported */
+#if 0
+	case LCPOPT_DEP6:
+	case LCPOPT_FCSALT:
+	case LCPOPT_SDP:
+	case LCPOPT_NUMMODE:
+	case LCPOPT_DEP12:
+	case LCPOPT_DEP14:
+	case LCPOPT_DEP15:
+	case LCPOPT_DEP16:
+        case LCPOPT_MLSSNHF:
+	case LCPOPT_PROP:
+	case LCPOPT_DCEID:
+	case LCPOPT_MPP:
+	case LCPOPT_LCPAOPT:
+	case LCPOPT_COBS:
+	case LCPOPT_PE:
+	case LCPOPT_MLHF:
+	case LCPOPT_I18N:
+	case LCPOPT_SDLOS:
+	case LCPOPT_PPPMUX:
+		break;
+#endif
+	default:
+		/*
+		 * Unknown option; dump it as raw bytes now if we're
+		 * not going to do so below.
+		 */
+		if (ndo->ndo_vflag < 2)
+			print_unknown_data(ndo, p + 2, "\n\t    ", len - 2);
+		break;
+	}
+
+	if (ndo->ndo_vflag > 1)
+		print_unknown_data(ndo, p + 2, "\n\t    ", len - 2); /* exclude TLV header */
+
+	return len;
+
+trunc:
+	ND_PRINT("[|lcp]");
+	return 0;
+}
+
+/* ML-PPP*/
+static const struct tok ppp_ml_flag_values[] = {
+    { 0x80, "begin" },
+    { 0x40, "end" },
+    { 0, NULL }
+};
+
+static void
+handle_mlppp(netdissect_options *ndo,
+             const u_char *p, u_int length)
+{
+    if (!ndo->ndo_eflag)
+        ND_PRINT("MLPPP, ");
+
+    if (length < 2) {
+        ND_PRINT("[|mlppp]");
+        return;
+    }
+    if (!ND_TTEST_2(p)) {
+        ND_PRINT("[|mlppp]");
+        return;
+    }
+
+    ND_PRINT("seq 0x%03x, Flags [%s], length %u",
+           (GET_BE_U_2(p))&0x0fff,
+           /* only support 12-Bit sequence space for now */
+           bittok2str(ppp_ml_flag_values, "none", GET_U_1(p) & 0xc0),
+           length);
+}
+
+/* CHAP */
+static void
+handle_chap(netdissect_options *ndo,
+            const u_char *p, u_int length)
+{
+	u_int code, len;
+	u_int val_size, name_size, msg_size;
+	const u_char *p0;
+	u_int i;
+
+	p0 = p;
+	if (length < 1) {
+		ND_PRINT("[|chap]");
+		return;
+	} else if (length < 4) {
+		ND_PRINT("[|chap 0x%02x]", GET_U_1(p));
+		return;
+	}
+
+	code = GET_U_1(p);
+	ND_PRINT("CHAP, %s (0x%02x)",
+               tok2str(chapcode_values,"unknown",code),
+               code);
+	p++;
+
+	ND_PRINT(", id %u", GET_U_1(p));	/* ID */
+	p++;
+
+	len = GET_BE_U_2(p);
+	p += 2;
+
+	/*
+	 * Note that this is a generic CHAP decoding routine. Since we
+	 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
+	 * MS-CHAPv2) is used at this point, we can't decode packet
+	 * specifically to each algorithms. Instead, we simply decode
+	 * the GCD (Gratest Common Denominator) for all algorithms.
+	 */
+	switch (code) {
+	case CHAP_CHAL:
+	case CHAP_RESP:
+		if (length - (p - p0) < 1)
+			return;
+		val_size = GET_U_1(p);	/* value size */
+		p++;
+		if (length - (p - p0) < val_size)
+			return;
+		ND_PRINT(", Value ");
+		for (i = 0; i < val_size; i++) {
+			ND_PRINT("%02x", GET_U_1(p));
+			p++;
+		}
+		name_size = len - (u_int)(p - p0);
+		ND_PRINT(", Name ");
+		for (i = 0; i < name_size; i++) {
+			fn_print_char(ndo, GET_U_1(p));
+			p++;
+		}
+		break;
+	case CHAP_SUCC:
+	case CHAP_FAIL:
+		msg_size = len - (u_int)(p - p0);
+		ND_PRINT(", Msg ");
+		for (i = 0; i< msg_size; i++) {
+			fn_print_char(ndo, GET_U_1(p));
+			p++;
+		}
+		break;
+	}
+}
+
+/* PAP (see RFC 1334) */
+static void
+handle_pap(netdissect_options *ndo,
+           const u_char *p, u_int length)
+{
+	u_int code, len;
+	u_int peerid_len, passwd_len, msg_len;
+	const u_char *p0;
+	u_int i;
+
+	p0 = p;
+	if (length < 1) {
+		ND_PRINT("[|pap]");
+		return;
+	} else if (length < 4) {
+		ND_PRINT("[|pap 0x%02x]", GET_U_1(p));
+		return;
+	}
+
+	code = GET_U_1(p);
+	ND_PRINT("PAP, %s (0x%02x)",
+	          tok2str(papcode_values, "unknown", code),
+	          code);
+	p++;
+
+	ND_PRINT(", id %u", GET_U_1(p));	/* ID */
+	p++;
+
+	len = GET_BE_U_2(p);
+	p += 2;
+
+	if (len > length) {
+		ND_PRINT(", length %u > packet size", len);
+		return;
+	}
+	length = len;
+	if (length < (size_t)(p - p0)) {
+		ND_PRINT(", length %u < PAP header length", length);
+		return;
+	}
+
+	switch (code) {
+	case PAP_AREQ:
+		/* A valid Authenticate-Request is 6 or more octets long. */
+		if (len < 6)
+			goto trunc;
+		if (length - (p - p0) < 1)
+			return;
+		peerid_len = GET_U_1(p);	/* Peer-ID Length */
+		p++;
+		if (length - (p - p0) < peerid_len)
+			return;
+		ND_PRINT(", Peer ");
+		for (i = 0; i < peerid_len; i++) {
+			fn_print_char(ndo, GET_U_1(p));
+			p++;
+		}
+
+		if (length - (p - p0) < 1)
+			return;
+		passwd_len = GET_U_1(p);	/* Password Length */
+		p++;
+		if (length - (p - p0) < passwd_len)
+			return;
+		ND_PRINT(", Name ");
+		for (i = 0; i < passwd_len; i++) {
+			fn_print_char(ndo, GET_U_1(p));
+			p++;
+		}
+		break;
+	case PAP_AACK:
+	case PAP_ANAK:
+		/* Although some implementations ignore truncation at
+		 * this point and at least one generates a truncated
+		 * packet, RFC 1334 section 2.2.2 clearly states that
+		 * both AACK and ANAK are at least 5 bytes long.
+		 */
+		if (len < 5)
+			goto trunc;
+		if (length - (p - p0) < 1)
+			return;
+		msg_len = GET_U_1(p);	/* Msg-Length */
+		p++;
+		if (length - (p - p0) < msg_len)
+			return;
+		ND_PRINT(", Msg ");
+		for (i = 0; i< msg_len; i++) {
+			fn_print_char(ndo, GET_U_1(p));
+			p++;
+		}
+		break;
+	}
+	return;
+
+trunc:
+	ND_PRINT("[|pap]");
+}
+
+/* BAP */
+static void
+handle_bap(netdissect_options *ndo _U_,
+           const u_char *p _U_, u_int length _U_)
+{
+	/* XXX: to be supported!! */
+}
+
+
+/* IPCP config options */
+static u_int
+print_ipcp_config_options(netdissect_options *ndo,
+                          const u_char *p, u_int length)
+{
+	u_int opt, len;
+        u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen;
+
+	if (length < 2)
+		return 0;
+	ND_TCHECK_2(p);
+	opt = GET_U_1(p);
+	len = GET_U_1(p + 1);
+	if (length < len)
+		return 0;
+	if (len < 2) {
+		ND_PRINT("\n\t  %s Option (0x%02x), length %u (length bogus, should be >= 2)",
+		       tok2str(ipcpopt_values,"unknown",opt),
+		       opt,
+		       len);
+		return 0;
+	}
+
+	ND_PRINT("\n\t  %s Option (0x%02x), length %u",
+	       tok2str(ipcpopt_values,"unknown",opt),
+	       opt,
+	       len);
+
+	switch (opt) {
+	case IPCPOPT_2ADDR:		/* deprecated */
+		if (len != 10) {
+			ND_PRINT(" (length bogus, should be = 10)");
+			return len;
+		}
+		ND_PRINT(": src %s, dst %s",
+		       GET_IPADDR_STRING(p + 2),
+		       GET_IPADDR_STRING(p + 6));
+		break;
+	case IPCPOPT_IPCOMP:
+		if (len < 4) {
+			ND_PRINT(" (length bogus, should be >= 4)");
+			return 0;
+		}
+		compproto = GET_BE_U_2(p + 2);
+
+		ND_PRINT(": %s (0x%02x):",
+		          tok2str(ipcpopt_compproto_values, "Unknown", compproto),
+		          compproto);
+
+		switch (compproto) {
+                case PPP_VJC:
+			/* XXX: VJ-Comp parameters should be decoded */
+                        break;
+                case IPCPOPT_IPCOMP_HDRCOMP:
+                        if (len < IPCPOPT_IPCOMP_MINLEN) {
+                                ND_PRINT(" (length bogus, should be >= %u)",
+                                         IPCPOPT_IPCOMP_MINLEN);
+                                return 0;
+                        }
+
+                        ND_TCHECK_LEN(p + 2, IPCPOPT_IPCOMP_MINLEN);
+                        ND_PRINT("\n\t    TCP Space %u, non-TCP Space %u"
+                               ", maxPeriod %u, maxTime %u, maxHdr %u",
+                               GET_BE_U_2(p + 4),
+                               GET_BE_U_2(p + 6),
+                               GET_BE_U_2(p + 8),
+                               GET_BE_U_2(p + 10),
+                               GET_BE_U_2(p + 12));
+
+                        /* suboptions present ? */
+                        if (len > IPCPOPT_IPCOMP_MINLEN) {
+                                ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN;
+                                p += IPCPOPT_IPCOMP_MINLEN;
+
+                                ND_PRINT("\n\t      Suboptions, length %u", ipcomp_subopttotallen);
+
+                                while (ipcomp_subopttotallen >= 2) {
+                                        ND_TCHECK_2(p);
+                                        ipcomp_subopt = GET_U_1(p);
+                                        ipcomp_suboptlen = GET_U_1(p + 1);
+
+                                        /* sanity check */
+                                        if (ipcomp_subopt == 0 ||
+                                            ipcomp_suboptlen == 0 )
+                                                break;
+
+                                        /* XXX: just display the suboptions for now */
+                                        ND_PRINT("\n\t\t%s Suboption #%u, length %u",
+                                               tok2str(ipcpopt_compproto_subopt_values,
+                                                       "Unknown",
+                                                       ipcomp_subopt),
+                                               ipcomp_subopt,
+                                               ipcomp_suboptlen);
+                                        if (ipcomp_subopttotallen < ipcomp_suboptlen) {
+                                                ND_PRINT(" [remaining suboptions length %u < %u]",
+                                                         ipcomp_subopttotallen, ipcomp_suboptlen);
+                                                nd_print_invalid(ndo);
+                                                break;
+                                        }
+                                        ipcomp_subopttotallen -= ipcomp_suboptlen;
+                                        p += ipcomp_suboptlen;
+                                }
+                        }
+                        break;
+                default:
+                        break;
+		}
+		break;
+
+	case IPCPOPT_ADDR:     /* those options share the same format - fall through */
+	case IPCPOPT_MOBILE4:
+	case IPCPOPT_PRIDNS:
+	case IPCPOPT_PRINBNS:
+	case IPCPOPT_SECDNS:
+	case IPCPOPT_SECNBNS:
+		if (len != 6) {
+			ND_PRINT(" (length bogus, should be = 6)");
+			return 0;
+		}
+		ND_PRINT(": %s", GET_IPADDR_STRING(p + 2));
+		break;
+	default:
+		/*
+		 * Unknown option; dump it as raw bytes now if we're
+		 * not going to do so below.
+		 */
+		if (ndo->ndo_vflag < 2)
+			print_unknown_data(ndo, p + 2, "\n\t    ", len - 2);
+		break;
+	}
+	if (ndo->ndo_vflag > 1)
+		print_unknown_data(ndo, p + 2, "\n\t    ", len - 2); /* exclude TLV header */
+	return len;
+
+trunc:
+	ND_PRINT("[|ipcp]");
+	return 0;
+}
+
+/* IP6CP config options */
+static u_int
+print_ip6cp_config_options(netdissect_options *ndo,
+                           const u_char *p, u_int length)
+{
+	u_int opt, len;
+
+	if (length < 2)
+		return 0;
+	ND_TCHECK_2(p);
+	opt = GET_U_1(p);
+	len = GET_U_1(p + 1);
+	if (length < len)
+		return 0;
+	if (len < 2) {
+		ND_PRINT("\n\t  %s Option (0x%02x), length %u (length bogus, should be >= 2)",
+		       tok2str(ip6cpopt_values,"unknown",opt),
+		       opt,
+		       len);
+		return 0;
+	}
+
+	ND_PRINT("\n\t  %s Option (0x%02x), length %u",
+	       tok2str(ip6cpopt_values,"unknown",opt),
+	       opt,
+	       len);
+
+	switch (opt) {
+	case IP6CP_IFID:
+		if (len != 10) {
+			ND_PRINT(" (length bogus, should be = 10)");
+			return len;
+		}
+		ND_TCHECK_8(p + 2);
+		ND_PRINT(": %04x:%04x:%04x:%04x",
+		       GET_BE_U_2(p + 2),
+		       GET_BE_U_2(p + 4),
+		       GET_BE_U_2(p + 6),
+		       GET_BE_U_2(p + 8));
+		break;
+	default:
+		/*
+		 * Unknown option; dump it as raw bytes now if we're
+		 * not going to do so below.
+		 */
+		if (ndo->ndo_vflag < 2)
+			print_unknown_data(ndo, p + 2, "\n\t    ", len - 2);
+		break;
+	}
+	if (ndo->ndo_vflag > 1)
+		print_unknown_data(ndo, p + 2, "\n\t    ", len - 2); /* exclude TLV header */
+
+	return len;
+
+trunc:
+	ND_PRINT("[|ip6cp]");
+	return 0;
+}
+
+
+/* CCP config options */
+static u_int
+print_ccp_config_options(netdissect_options *ndo,
+                         const u_char *p, u_int length)
+{
+	u_int opt, len;
+
+	if (length < 2)
+		return 0;
+	ND_TCHECK_2(p);
+	opt = GET_U_1(p);
+	len = GET_U_1(p + 1);
+	if (length < len)
+		return 0;
+	if (len < 2) {
+		ND_PRINT("\n\t  %s Option (0x%02x), length %u (length bogus, should be >= 2)",
+		          tok2str(ccpconfopts_values, "Unknown", opt),
+		          opt,
+		          len);
+		return 0;
+	}
+
+	ND_PRINT("\n\t  %s Option (0x%02x), length %u",
+	          tok2str(ccpconfopts_values, "Unknown", opt),
+	          opt,
+	          len);
+
+	switch (opt) {
+	case CCPOPT_BSDCOMP:
+		if (len < 3) {
+			ND_PRINT(" (length bogus, should be >= 3)");
+			return len;
+		}
+		ND_PRINT(": Version: %u, Dictionary Bits: %u",
+			GET_U_1(p + 2) >> 5,
+			GET_U_1(p + 2) & 0x1f);
+		break;
+	case CCPOPT_MVRCA:
+		if (len < 4) {
+			ND_PRINT(" (length bogus, should be >= 4)");
+			return len;
+		}
+		ND_PRINT(": Features: %u, PxP: %s, History: %u, #CTX-ID: %u",
+				(GET_U_1(p + 2) & 0xc0) >> 6,
+				(GET_U_1(p + 2) & 0x20) ? "Enabled" : "Disabled",
+				GET_U_1(p + 2) & 0x1f,
+				GET_U_1(p + 3));
+		break;
+	case CCPOPT_DEFLATE:
+		if (len < 4) {
+			ND_PRINT(" (length bogus, should be >= 4)");
+			return len;
+		}
+		ND_PRINT(": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u",
+			(GET_U_1(p + 2) & 0xf0) >> 4,
+			((GET_U_1(p + 2) & 0x0f) == 8) ? "zlib" : "unknown",
+			GET_U_1(p + 2) & 0x0f,
+			(GET_U_1(p + 3) & 0xfc) >> 2,
+			GET_U_1(p + 3) & 0x03);
+		break;
+
+/* XXX: to be supported */
+#if 0
+	case CCPOPT_OUI:
+	case CCPOPT_PRED1:
+	case CCPOPT_PRED2:
+	case CCPOPT_PJUMP:
+	case CCPOPT_HPPPC:
+	case CCPOPT_STACLZS:
+	case CCPOPT_MPPC:
+	case CCPOPT_GFZA:
+	case CCPOPT_V42BIS:
+	case CCPOPT_LZSDCP:
+	case CCPOPT_DEC:
+	case CCPOPT_RESV:
+		break;
+#endif
+	default:
+		/*
+		 * Unknown option; dump it as raw bytes now if we're
+		 * not going to do so below.
+		 */
+		if (ndo->ndo_vflag < 2)
+			print_unknown_data(ndo, p + 2, "\n\t    ", len - 2);
+		break;
+	}
+	if (ndo->ndo_vflag > 1)
+		print_unknown_data(ndo, p + 2, "\n\t    ", len - 2); /* exclude TLV header */
+
+	return len;
+
+trunc:
+	ND_PRINT("[|ccp]");
+	return 0;
+}
+
+/* BACP config options */
+static u_int
+print_bacp_config_options(netdissect_options *ndo,
+                          const u_char *p, u_int length)
+{
+	u_int opt, len;
+
+	if (length < 2)
+		return 0;
+	ND_TCHECK_2(p);
+	opt = GET_U_1(p);
+	len = GET_U_1(p + 1);
+	if (length < len)
+		return 0;
+	if (len < 2) {
+		ND_PRINT("\n\t  %s Option (0x%02x), length %u (length bogus, should be >= 2)",
+		          tok2str(bacconfopts_values, "Unknown", opt),
+		          opt,
+		          len);
+		return 0;
+	}
+
+	ND_PRINT("\n\t  %s Option (0x%02x), length %u",
+	          tok2str(bacconfopts_values, "Unknown", opt),
+	          opt,
+	          len);
+
+	switch (opt) {
+	case BACPOPT_FPEER:
+		if (len != 6) {
+			ND_PRINT(" (length bogus, should be = 6)");
+			return len;
+		}
+		ND_PRINT(": Magic-Num 0x%08x", GET_BE_U_4(p + 2));
+		break;
+	default:
+		/*
+		 * Unknown option; dump it as raw bytes now if we're
+		 * not going to do so below.
+		 */
+		if (ndo->ndo_vflag < 2)
+			print_unknown_data(ndo, p + 2, "\n\t    ", len - 2);
+		break;
+	}
+	if (ndo->ndo_vflag > 1)
+		print_unknown_data(ndo, p + 2, "\n\t    ", len - 2); /* exclude TLV header */
+
+	return len;
+
+trunc:
+	ND_PRINT("[|bacp]");
+	return 0;
+}
+
+/*
+ * Un-escape RFC 1662 PPP in HDLC-like framing, with octet escapes.
+ * The length argument is the on-the-wire length, not the captured
+ * length; we can only un-escape the captured part.
+ */
+static void
+ppp_hdlc(netdissect_options *ndo,
+         const u_char *p, u_int length)
+{
+	u_int caplen = ND_BYTES_AVAILABLE_AFTER(p);
+	u_char *b, *t, c;
+	const u_char *s;
+	u_int i, proto;
+	const void *sb, *se;
+
+	if (caplen == 0)
+		return;
+
+        if (length == 0)
+                return;
+
+	b = (u_char *)nd_malloc(ndo, caplen);
+	if (b == NULL)
+		return;
+
+	/*
+	 * Unescape all the data into a temporary, private, buffer.
+	 * Do this so that we don't overwrite the original packet
+	 * contents.
+	 */
+	for (s = p, t = b, i = caplen; i != 0; i--) {
+		c = GET_U_1(s);
+		s++;
+		if (c == 0x7d) {
+			if (i <= 1)
+				break;
+			i--;
+			c = GET_U_1(s) ^ 0x20;
+			s++;
+		}
+		*t++ = c;
+	}
+
+	/*
+	 * Change the end pointer, so bounds checks work.
+	 * Change the pointer to packet data to help debugging.
+	 */
+	sb = ndo->ndo_packetp;
+	se = ndo->ndo_snapend;
+	ndo->ndo_packetp = b;
+	ndo->ndo_snapend = t;
+	length = ND_BYTES_AVAILABLE_AFTER(b);
+
+        /* now lets guess about the payload codepoint format */
+        if (length < 1)
+                goto trunc;
+        proto = GET_U_1(b); /* start with a one-octet codepoint guess */
+
+        switch (proto) {
+        case PPP_IP:
+		ip_print(ndo, b + 1, length - 1);
+		goto cleanup;
+        case PPP_IPV6:
+		ip6_print(ndo, b + 1, length - 1);
+		goto cleanup;
+        default: /* no luck - try next guess */
+		break;
+        }
+
+        if (length < 2)
+                goto trunc;
+        proto = GET_BE_U_2(b); /* next guess - load two octets */
+
+        switch (proto) {
+        case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */
+            if (length < 4)
+                goto trunc;
+            proto = GET_BE_U_2(b + 2); /* load the PPP proto-id */
+            if ((proto & 0xff00) == 0x7e00)
+                ND_PRINT("(protocol 0x%04x invalid)", proto);
+            else
+                handle_ppp(ndo, proto, b + 4, length - 4);
+            break;
+        default: /* last guess - proto must be a PPP proto-id */
+            if ((proto & 0xff00) == 0x7e00)
+                ND_PRINT("(protocol 0x%04x invalid)", proto);
+            else
+                handle_ppp(ndo, proto, b + 2, length - 2);
+            break;
+        }
+
+cleanup:
+	ndo->ndo_packetp = sb;
+	ndo->ndo_snapend = se;
+        return;
+
+trunc:
+	ndo->ndo_packetp = sb;
+	ndo->ndo_snapend = se;
+	nd_print_trunc(ndo);
+}
+
+
+/* PPP */
+static void
+handle_ppp(netdissect_options *ndo,
+           u_int proto, const u_char *p, u_int length)
+{
+	if ((proto & 0xff00) == 0x7e00) { /* is this an escape code ? */
+		ppp_hdlc(ndo, p - 1, length);
+		return;
+	}
+
+	switch (proto) {
+	case PPP_LCP: /* fall through */
+	case PPP_IPCP:
+	case PPP_OSICP:
+	case PPP_MPLSCP:
+	case PPP_IPV6CP:
+	case PPP_CCP:
+	case PPP_BACP:
+		handle_ctrl_proto(ndo, proto, p, length);
+		break;
+	case PPP_ML:
+		handle_mlppp(ndo, p, length);
+		break;
+	case PPP_CHAP:
+		handle_chap(ndo, p, length);
+		break;
+	case PPP_PAP:
+		handle_pap(ndo, p, length);
+		break;
+	case PPP_BAP:		/* XXX: not yet completed */
+		handle_bap(ndo, p, length);
+		break;
+	case ETHERTYPE_IP:	/*XXX*/
+        case PPP_VJNC:
+	case PPP_IP:
+		ip_print(ndo, p, length);
+		break;
+	case ETHERTYPE_IPV6:	/*XXX*/
+	case PPP_IPV6:
+		ip6_print(ndo, p, length);
+		break;
+	case ETHERTYPE_IPX:	/*XXX*/
+	case PPP_IPX:
+		ipx_print(ndo, p, length);
+		break;
+	case PPP_OSI:
+		isoclns_print(ndo, p, length);
+		break;
+	case PPP_MPLS_UCAST:
+	case PPP_MPLS_MCAST:
+		mpls_print(ndo, p, length);
+		break;
+	case PPP_COMP:
+		ND_PRINT("compressed PPP data");
+		break;
+	default:
+		ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
+		print_unknown_data(ndo, p, "\n\t", length);
+		break;
+	}
+}
+
+/* Standard PPP printer */
+u_int
+ppp_print(netdissect_options *ndo,
+          const u_char *p, u_int length)
+{
+	u_int proto,ppp_header;
+        u_int olen = length; /* _o_riginal length */
+	u_int hdr_len = 0;
+
+	ndo->ndo_protocol = "ppp";
+	/*
+	 * Here, we assume that p points to the Address and Control
+	 * field (if they present).
+	 */
+	if (length < 2)
+		goto trunc;
+        ppp_header = GET_BE_U_2(p);
+
+        switch(ppp_header) {
+        case (PPP_PPPD_IN  << 8 | PPP_CONTROL):
+            if (ndo->ndo_eflag) ND_PRINT("In  ");
+            p += 2;
+            length -= 2;
+            hdr_len += 2;
+            break;
+        case (PPP_PPPD_OUT << 8 | PPP_CONTROL):
+            if (ndo->ndo_eflag) ND_PRINT("Out ");
+            p += 2;
+            length -= 2;
+            hdr_len += 2;
+            break;
+        case (PPP_ADDRESS << 8 | PPP_CONTROL):
+            p += 2;			/* ACFC not used */
+            length -= 2;
+            hdr_len += 2;
+            break;
+
+        default:
+            break;
+        }
+
+	if (length < 2)
+		goto trunc;
+	if (GET_U_1(p) % 2) {
+		proto = GET_U_1(p);	/* PFC is used */
+		p++;
+		length--;
+		hdr_len++;
+	} else {
+		proto = GET_BE_U_2(p);
+		p += 2;
+		length -= 2;
+		hdr_len += 2;
+	}
+
+	if (ndo->ndo_eflag) {
+		const char *typestr;
+		typestr = tok2str(ppptype2str, "unknown", proto);
+		ND_PRINT("%s (0x%04x), length %u",
+		          typestr,
+		          proto,
+		          olen);
+		if (*typestr == 'u')	/* "unknown" */
+			return hdr_len;
+
+		ND_PRINT(": ");
+	}
+
+	handle_ppp(ndo, proto, p, length);
+	return (hdr_len);
+trunc:
+	nd_print_trunc(ndo);
+	return (0);
+}
+
+
+/* PPP I/F printer */
+void
+ppp_if_print(netdissect_options *ndo,
+             const struct pcap_pkthdr *h, const u_char *p)
+{
+	u_int length = h->len;
+	u_int caplen = h->caplen;
+
+	ndo->ndo_protocol = "ppp";
+	if (caplen < PPP_HDRLEN) {
+		nd_print_trunc(ndo);
+		ndo->ndo_ll_hdr_len += caplen;
+		return;
+	}
+	ndo->ndo_ll_hdr_len += PPP_HDRLEN;
+
+#if 0
+	/*
+	 * XXX: seems to assume that there are 2 octets prepended to an
+	 * actual PPP frame. The 1st octet looks like Input/Output flag
+	 * while 2nd octet is unknown, at least to me
+	 * (mshindo@mshindo.net).
+	 *
+	 * That was what the original tcpdump code did.
+	 *
+	 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
+	 * packets and 0 for inbound packets - but only if the
+	 * protocol field has the 0x8000 bit set (i.e., it's a network
+	 * control protocol); it does so before running the packet through
+	 * "bpf_filter" to see if it should be discarded, and to see
+	 * if we should update the time we sent the most recent packet...
+	 *
+	 * ...but it puts the original address field back after doing
+	 * so.
+	 *
+	 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
+	 *
+	 * I don't know if any PPP implementation handed up to a BPF
+	 * device packets with the first octet being 1 for outbound and
+	 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
+	 * whether that ever needs to be checked or not.
+	 *
+	 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
+	 * and its tcpdump appears to assume that the frame always
+	 * begins with an address field and a control field, and that
+	 * the address field might be 0x0f or 0x8f, for Cisco
+	 * point-to-point with HDLC framing as per section 4.3.1 of RFC
+	 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
+	 * RFC 1662.
+	 *
+	 * (Is the Cisco framing in question what DLT_C_HDLC, in
+	 * BSD/OS, is?)
+	 */
+	if (ndo->ndo_eflag)
+		ND_PRINT("%c %4d %02x ", GET_U_1(p) ? 'O' : 'I',
+			 length, GET_U_1(p + 1));
+#endif
+
+	ppp_print(ndo, p, length);
+}
+
+/*
+ * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
+ * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
+ * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
+ * discard them *if* those are the first two octets, and parse the remaining
+ * packet as a PPP packet, as "ppp_print()" does).
+ *
+ * This handles, for example, DLT_PPP_SERIAL in NetBSD.
+ */
+void
+ppp_hdlc_if_print(netdissect_options *ndo,
+                  const struct pcap_pkthdr *h, const u_char *p)
+{
+	u_int length = h->len;
+	u_int caplen = h->caplen;
+	u_int proto;
+	u_int hdrlen = 0;
+
+	ndo->ndo_protocol = "ppp_hdlc";
+	if (caplen < 2) {
+		nd_print_trunc(ndo);
+		ndo->ndo_ll_hdr_len += caplen;
+		return;
+	}
+
+	switch (GET_U_1(p)) {
+
+	case PPP_ADDRESS:
+		if (caplen < 4) {
+			nd_print_trunc(ndo);
+			ndo->ndo_ll_hdr_len += caplen;
+			return;
+		}
+
+		if (ndo->ndo_eflag)
+			ND_PRINT("%02x %02x %u ", GET_U_1(p),
+				 GET_U_1(p + 1), length);
+		p += 2;
+		length -= 2;
+		hdrlen += 2;
+
+		proto = GET_BE_U_2(p);
+		p += 2;
+		length -= 2;
+		hdrlen += 2;
+		ND_PRINT("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
+
+		handle_ppp(ndo, proto, p, length);
+		break;
+
+	case CHDLC_UNICAST:
+	case CHDLC_BCAST:
+		chdlc_if_print(ndo, h, p);
+		return;
+
+	default:
+		if (caplen < 4) {
+			nd_print_trunc(ndo);
+			ndo->ndo_ll_hdr_len += caplen;
+			return;
+		}
+
+		if (ndo->ndo_eflag)
+			ND_PRINT("%02x %02x %u ", GET_U_1(p),
+				 GET_U_1(p + 1), length);
+		p += 2;
+		hdrlen += 2;
+
+		/*
+		 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
+		 * the next two octets as an Ethernet type; does that
+		 * ever happen?
+		 */
+		ND_PRINT("unknown addr %02x; ctrl %02x", GET_U_1(p),
+			 GET_U_1(p + 1));
+		break;
+	}
+
+	ndo->ndo_ll_hdr_len += hdrlen;
+}
+
+#define PPP_BSDI_HDRLEN 24
+
+/* BSD/OS specific PPP printer */
+void
+ppp_bsdos_if_print(netdissect_options *ndo,
+                   const struct pcap_pkthdr *h _U_, const u_char *p _U_)
+{
+	u_int hdrlength;
+#ifdef __bsdi__
+	u_int length = h->len;
+	u_int caplen = h->caplen;
+	uint16_t ptype;
+	uint8_t llhl;
+	const u_char *q;
+	u_int i;
+
+	ndo->ndo_protocol = "ppp_bsdos";
+	if (caplen < PPP_BSDI_HDRLEN) {
+		nd_print_trunc(ndo);
+		ndo->ndo_ll_hdr_len += caplen;
+		return;
+	}
+
+	hdrlength = 0;
+
+#if 0
+	if (GET_U_1(p) == PPP_ADDRESS &&
+	    GET_U_1(p + 1) == PPP_CONTROL) {
+		if (ndo->ndo_eflag)
+			ND_PRINT("%02x %02x ", GET_U_1(p),
+				 GET_U_1(p + 1));
+		p += 2;
+		hdrlength = 2;
+	}
+
+	if (ndo->ndo_eflag)
+		ND_PRINT("%u ", length);
+	/* Retrieve the protocol type */
+	if (GET_U_1(p) & 01) {
+		/* Compressed protocol field */
+		ptype = GET_U_1(p);
+		if (ndo->ndo_eflag)
+			ND_PRINT("%02x ", ptype);
+		p++;
+		hdrlength += 1;
+	} else {
+		/* Un-compressed protocol field */
+		ptype = GET_BE_U_2(p);
+		if (ndo->ndo_eflag)
+			ND_PRINT("%04x ", ptype);
+		p += 2;
+		hdrlength += 2;
+	}
+#else
+	ptype = 0;	/*XXX*/
+	if (ndo->ndo_eflag)
+		ND_PRINT("%c ", GET_U_1(p + SLC_DIR) ? 'O' : 'I');
+	llhl = GET_U_1(p + SLC_LLHL);
+	if (llhl) {
+		/* link level header */
+		struct ppp_header *ph;
+
+		q = p + SLC_BPFHDRLEN;
+		ph = (struct ppp_header *)q;
+		if (ph->phdr_addr == PPP_ADDRESS
+		 && ph->phdr_ctl == PPP_CONTROL) {
+			if (ndo->ndo_eflag)
+				ND_PRINT("%02x %02x ", GET_U_1(q),
+					 GET_U_1(q + 1));
+			ptype = GET_BE_U_2(&ph->phdr_type);
+			if (ndo->ndo_eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
+				ND_PRINT("%s ", tok2str(ppptype2str,
+						"proto-#%u", ptype));
+			}
+		} else {
+			if (ndo->ndo_eflag) {
+				ND_PRINT("LLH=[");
+				for (i = 0; i < llhl; i++)
+					ND_PRINT("%02x", GET_U_1(q + i));
+				ND_PRINT("] ");
+			}
+		}
+	}
+	if (ndo->ndo_eflag)
+		ND_PRINT("%u ", length);
+	if (GET_U_1(p + SLC_CHL)) {
+		q = p + SLC_BPFHDRLEN + llhl;
+
+		switch (ptype) {
+		case PPP_VJC:
+			ptype = vjc_print(ndo, q, ptype);
+			hdrlength = PPP_BSDI_HDRLEN;
+			p += hdrlength;
+			switch (ptype) {
+			case PPP_IP:
+				ip_print(ndo, p, length);
+				break;
+			case PPP_IPV6:
+				ip6_print(ndo, p, length);
+				break;
+			case PPP_MPLS_UCAST:
+			case PPP_MPLS_MCAST:
+				mpls_print(ndo, p, length);
+				break;
+			}
+			goto printx;
+		case PPP_VJNC:
+			ptype = vjc_print(ndo, q, ptype);
+			hdrlength = PPP_BSDI_HDRLEN;
+			p += hdrlength;
+			switch (ptype) {
+			case PPP_IP:
+				ip_print(ndo, p, length);
+				break;
+			case PPP_IPV6:
+				ip6_print(ndo, p, length);
+				break;
+			case PPP_MPLS_UCAST:
+			case PPP_MPLS_MCAST:
+				mpls_print(ndo, p, length);
+				break;
+			}
+			goto printx;
+		default:
+			if (ndo->ndo_eflag) {
+				ND_PRINT("CH=[");
+				for (i = 0; i < llhl; i++)
+					ND_PRINT("%02x",
+					    GET_U_1(q + i));
+				ND_PRINT("] ");
+			}
+			break;
+		}
+	}
+
+	hdrlength = PPP_BSDI_HDRLEN;
+#endif
+
+	length -= hdrlength;
+	p += hdrlength;
+
+	switch (ptype) {
+	case PPP_IP:
+		ip_print(p, length);
+		break;
+	case PPP_IPV6:
+		ip6_print(ndo, p, length);
+		break;
+	case PPP_MPLS_UCAST:
+	case PPP_MPLS_MCAST:
+		mpls_print(ndo, p, length);
+		break;
+	default:
+		ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
+	}
+
+printx:
+#else /* __bsdi */
+	hdrlength = 0;
+#endif /* __bsdi__ */
+	ndo->ndo_ll_hdr_len += hdrlength;
+}