/* * 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 */ #include #ifndef lint __RCSID("$NetBSD: print-ppp.c,v 1.9.14.1 2024/03/09 18:25:30 bouyer Exp $"); #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #ifdef __bsdi__ #include #include #endif #include #include "netdissect.h" #include "extract.h" #include "addrtoname.h" #include "ppp.h" #include "chdlc.h" #include "ethertype.h" #include "oui.h" /* * The following constatns are defined by IANA. Please refer to * http://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 #define LCPOPT_MIN LCPOPT_VEXT #define LCPOPT_MAX LCPOPT_PPPMUX 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) */ }; /* 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 int print_lcp_config_options(netdissect_options *, const u_char *p, int); static int print_ipcp_config_options(netdissect_options *, const u_char *p, int); static int print_ip6cp_config_options(netdissect_options *, const u_char *p, int); static int print_ccp_config_options(netdissect_options *, const u_char *p, int); static int print_bacp_config_options(netdissect_options *, const u_char *p, int); static void handle_ppp(netdissect_options *, u_int proto, const u_char *p, 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, int length) { const char *typestr; u_int code, len; int (*pfunc)(netdissect_options *, const u_char *, int); int x, j; const u_char *tptr; tptr=pptr; typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto); ND_PRINT((ndo, "%s, ", typestr)); if (length < 4) /* FIXME weak boundary checking */ goto trunc; ND_TCHECK2(*tptr, 2); code = *tptr++; ND_PRINT((ndo, "%s (0x%02x), id %u, length %u", tok2str(cpcodes, "Unknown Opcode",code), code, *tptr++, /* ID */ length + 2)); if (!ndo->ndo_vflag) return; if (length <= 4) return; /* there may be a NULL confreq etc. */ ND_TCHECK2(*tptr, 2); len = EXTRACT_16BITS(tptr); tptr += 2; ND_PRINT((ndo, "\n\tencoded length %u (=Option(s) length %u)", len, len - 4)); if (ndo->ndo_vflag > 1) print_unknown_data(ndo, pptr - 2, "\n\t", 6); switch (code) { case CPCODES_VEXT: if (length < 11) break; ND_TCHECK2(*tptr, 4); ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); tptr += 4; ND_TCHECK2(*tptr, 3); ND_PRINT((ndo, " Vendor: %s (%u)", tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)), EXTRACT_24BITS(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: x = 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 ((j = (*pfunc)(ndo, tptr, len)) == 0) break; x -= j; tptr += j; } while (x > 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_TCHECK2(*tptr, 2); ND_PRINT((ndo, "\n\t Rejected %s Protocol (0x%04x)", tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)), EXTRACT_16BITS(tptr))); /* XXX: need to decode Rejected-Information? - hexdump for now */ if (len > 6) { ND_PRINT((ndo, "\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_TCHECK2(*tptr, 4); ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); /* XXX: need to decode Data? - hexdump for now */ if (len > 8) { ND_PRINT((ndo, "\n\t -----trailing data-----")); ND_TCHECK2(tptr[4], len - 8); print_unknown_data(ndo, tptr + 4, "\n\t ", len - 8); } break; case CPCODES_ID: if (length < 8) break; ND_TCHECK2(*tptr, 4); ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); /* RFC 1661 says this is intended to be human readable */ if (len > 8) { ND_PRINT((ndo, "\n\t Message\n\t ")); if (fn_printn(ndo, tptr + 4, len - 4, ndo->ndo_snapend)) goto trunc; } break; case CPCODES_TIME_REM: if (length < 12) break; ND_TCHECK2(*tptr, 4); ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); ND_TCHECK2(*(tptr + 4), 4); ND_PRINT((ndo, ", Seconds-Remaining %us", EXTRACT_32BITS(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((ndo, "[|%s]", typestr)); } /* LCP config options */ static int print_lcp_config_options(netdissect_options *ndo, const u_char *p, int length) { int len, opt; if (length < 2) return 0; ND_TCHECK2(*p, 2); len = p[1]; opt = p[0]; if (length < len) return 0; if (len < 2) { if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", lcpconfopts[opt], opt, len)); else ND_PRINT((ndo, "\n\tunknown LCP option 0x%02x", opt)); return 0; } if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len)); else { ND_PRINT((ndo, "\n\tunknown LCP option 0x%02x", opt)); return len; } switch (opt) { case LCPOPT_VEXT: if (len < 6) { ND_PRINT((ndo, " (length bogus, should be >= 6)")); return len; } ND_TCHECK_24BITS(p + 2); ND_PRINT((ndo, ": Vendor: %s (%u)", tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)), EXTRACT_24BITS(p + 2))); #if 0 ND_TCHECK(p[5]); ND_PRINT((ndo, ", kind: 0x%02x", p[5])); ND_PRINT((ndo, ", Value: 0x")); for (i = 0; i < len - 6; i++) { ND_TCHECK(p[6 + i]); ND_PRINT((ndo, "%02x", p[6 + i])); } #endif break; case LCPOPT_MRU: if (len != 4) { ND_PRINT((ndo, " (length bogus, should be = 4)")); return len; } ND_TCHECK_16BITS(p + 2); ND_PRINT((ndo, ": %u", EXTRACT_16BITS(p + 2))); break; case LCPOPT_ACCM: if (len != 6) { ND_PRINT((ndo, " (length bogus, should be = 6)")); return len; } ND_TCHECK_32BITS(p + 2); ND_PRINT((ndo, ": 0x%08x", EXTRACT_32BITS(p + 2))); break; case LCPOPT_AP: if (len < 4) { ND_PRINT((ndo, " (length bogus, should be >= 4)")); return len; } ND_TCHECK_16BITS(p + 2); ND_PRINT((ndo, ": %s", tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", EXTRACT_16BITS(p + 2)))); switch (EXTRACT_16BITS(p+2)) { case PPP_CHAP: ND_TCHECK(p[4]); ND_PRINT((ndo, ", %s", tok2str(authalg_values, "Unknown Auth Alg %u", 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((ndo, " (length bogus, should be >= 4)")); return 0; } ND_TCHECK_16BITS(p+2); if (EXTRACT_16BITS(p+2) == PPP_LQM) ND_PRINT((ndo, ": LQR")); else ND_PRINT((ndo, ": unknown")); break; case LCPOPT_MN: if (len != 6) { ND_PRINT((ndo, " (length bogus, should be = 6)")); return 0; } ND_TCHECK_32BITS(p + 2); ND_PRINT((ndo, ": 0x%08x", EXTRACT_32BITS(p + 2))); break; case LCPOPT_PFC: break; case LCPOPT_ACFC: break; case LCPOPT_LD: if (len != 4) { ND_PRINT((ndo, " (length bogus, should be = 4)")); return 0; } ND_TCHECK_16BITS(p + 2); ND_PRINT((ndo, ": 0x%04x", EXTRACT_16BITS(p + 2))); break; case LCPOPT_CBACK: if (len < 3) { ND_PRINT((ndo, " (length bogus, should be >= 3)")); return 0; } ND_PRINT((ndo, ": ")); ND_TCHECK(p[2]); ND_PRINT((ndo, ": Callback Operation %s (%u)", tok2str(ppp_callback_values, "Unknown", p[2]), p[2])); break; case LCPOPT_MLMRRU: if (len != 4) { ND_PRINT((ndo, " (length bogus, should be = 4)")); return 0; } ND_TCHECK_16BITS(p + 2); ND_PRINT((ndo, ": %u", EXTRACT_16BITS(p + 2))); break; case LCPOPT_MLED: if (len < 3) { ND_PRINT((ndo, " (length bogus, should be >= 3)")); return 0; } ND_TCHECK(p[2]); switch (p[2]) { /* class */ case MEDCLASS_NULL: ND_PRINT((ndo, ": Null")); break; case MEDCLASS_LOCAL: ND_PRINT((ndo, ": Local")); /* XXX */ break; case MEDCLASS_IPV4: if (len != 7) { ND_PRINT((ndo, " (length bogus, should be = 7)")); return 0; } ND_TCHECK2(*(p + 3), 4); ND_PRINT((ndo, ": IPv4 %s", ipaddr_string(ndo, p + 3))); break; case MEDCLASS_MAC: if (len != 9) { ND_PRINT((ndo, " (length bogus, should be = 9)")); return 0; } ND_TCHECK2(*(p + 3), 6); ND_PRINT((ndo, ": MAC %s", etheraddr_string(ndo, p + 3))); break; case MEDCLASS_MNB: ND_PRINT((ndo, ": Magic-Num-Block")); /* XXX */ break; case MEDCLASS_PSNDN: ND_PRINT((ndo, ": PSNDN")); /* XXX */ break; default: ND_PRINT((ndo, ": Unknown class %u", 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((ndo, "[|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, int length) { if (!ndo->ndo_eflag) ND_PRINT((ndo, "MLPPP, ")); if (length < 2) { ND_PRINT((ndo, "[|mlppp]")); return; } if (!ND_TTEST_16BITS(p)) { ND_PRINT((ndo, "[|mlppp]")); return; } ND_PRINT((ndo, "seq 0x%03x, Flags [%s], length %u", (EXTRACT_16BITS(p))&0x0fff, /* only support 12-Bit sequence space for now */ bittok2str(ppp_ml_flag_values, "none", *p & 0xc0), length)); } /* CHAP */ static void handle_chap(netdissect_options *ndo, const u_char *p, int length) { u_int code, len; int val_size, name_size, msg_size; const u_char *p0; int i; p0 = p; if (length < 1) { ND_PRINT((ndo, "[|chap]")); return; } else if (length < 4) { ND_TCHECK(*p); ND_PRINT((ndo, "[|chap 0x%02x]", *p)); return; } ND_TCHECK(*p); code = *p; ND_PRINT((ndo, "CHAP, %s (0x%02x)", tok2str(chapcode_values,"unknown",code), code)); p++; ND_TCHECK(*p); ND_PRINT((ndo, ", id %u", *p)); /* ID */ p++; ND_TCHECK2(*p, 2); len = EXTRACT_16BITS(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; ND_TCHECK(*p); val_size = *p; /* value size */ p++; if (length - (p - p0) < val_size) return; ND_PRINT((ndo, ", Value ")); for (i = 0; i < val_size; i++) { ND_TCHECK(*p); ND_PRINT((ndo, "%02x", *p++)); } name_size = len - (p - p0); ND_PRINT((ndo, ", Name ")); for (i = 0; i < name_size; i++) { ND_TCHECK(*p); safeputchar(ndo, *p++); } break; case CHAP_SUCC: case CHAP_FAIL: msg_size = len - (p - p0); ND_PRINT((ndo, ", Msg ")); for (i = 0; i< msg_size; i++) { ND_TCHECK(*p); safeputchar(ndo, *p++); } break; } return; trunc: ND_PRINT((ndo, "[|chap]")); } /* PAP (see RFC 1334) */ static void handle_pap(netdissect_options *ndo, const u_char *p, int length) { u_int code, len; int peerid_len, passwd_len, msg_len; const u_char *p0; int i; p0 = p; if (length < 1) { ND_PRINT((ndo, "[|pap]")); return; } else if (length < 4) { ND_TCHECK(*p); ND_PRINT((ndo, "[|pap 0x%02x]", *p)); return; } ND_TCHECK(*p); code = *p; ND_PRINT((ndo, "PAP, %s (0x%02x)", tok2str(papcode_values, "unknown", code), code)); p++; ND_TCHECK(*p); ND_PRINT((ndo, ", id %u", *p)); /* ID */ p++; ND_TCHECK2(*p, 2); len = EXTRACT_16BITS(p); p += 2; if ((int)len > length) { ND_PRINT((ndo, ", length %u > packet size", len)); return; } length = len; if (length < (p - p0)) { ND_PRINT((ndo, ", 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; ND_TCHECK(*p); peerid_len = *p; /* Peer-ID Length */ p++; if (length - (p - p0) < peerid_len) return; ND_PRINT((ndo, ", Peer ")); for (i = 0; i < peerid_len; i++) { ND_TCHECK(*p); safeputchar(ndo, *p++); } if (length - (p - p0) < 1) return; ND_TCHECK(*p); passwd_len = *p; /* Password Length */ p++; if (length - (p - p0) < passwd_len) return; ND_PRINT((ndo, ", Name ")); for (i = 0; i < passwd_len; i++) { ND_TCHECK(*p); safeputchar(ndo, *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; ND_TCHECK(*p); msg_len = *p; /* Msg-Length */ p++; if (length - (p - p0) < msg_len) return; ND_PRINT((ndo, ", Msg ")); for (i = 0; i< msg_len; i++) { ND_TCHECK(*p); safeputchar(ndo, *p++); } break; } return; trunc: ND_PRINT((ndo, "[|pap]")); } /* BAP */ static void handle_bap(netdissect_options *ndo _U_, const u_char *p _U_, int length _U_) { /* XXX: to be supported!! */ } /* IPCP config options */ static int print_ipcp_config_options(netdissect_options *ndo, const u_char *p, int length) { int len, opt; u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen; if (length < 2) return 0; ND_TCHECK2(*p, 2); len = p[1]; opt = p[0]; if (length < len) return 0; if (len < 2) { ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", tok2str(ipcpopt_values,"unknown",opt), opt, len)); return 0; } ND_PRINT((ndo, "\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((ndo, " (length bogus, should be = 10)")); return len; } ND_TCHECK2(*(p + 6), 4); ND_PRINT((ndo, ": src %s, dst %s", ipaddr_string(ndo, p + 2), ipaddr_string(ndo, p + 6))); break; case IPCPOPT_IPCOMP: if (len < 4) { ND_PRINT((ndo, " (length bogus, should be >= 4)")); return 0; } ND_TCHECK_16BITS(p+2); compproto = EXTRACT_16BITS(p+2); ND_PRINT((ndo, ": %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((ndo, " (length bogus, should be >= %u)", IPCPOPT_IPCOMP_MINLEN)); return 0; } ND_TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN); ND_PRINT((ndo, "\n\t TCP Space %u, non-TCP Space %u" \ ", maxPeriod %u, maxTime %u, maxHdr %u", EXTRACT_16BITS(p+4), EXTRACT_16BITS(p+6), EXTRACT_16BITS(p+8), EXTRACT_16BITS(p+10), EXTRACT_16BITS(p+12))); /* suboptions present ? */ if (len > IPCPOPT_IPCOMP_MINLEN) { ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN; p += IPCPOPT_IPCOMP_MINLEN; ND_PRINT((ndo, "\n\t Suboptions, length %u", ipcomp_subopttotallen)); while (ipcomp_subopttotallen >= 2) { ND_TCHECK2(*p, 2); ipcomp_subopt = *p; ipcomp_suboptlen = *(p+1); /* sanity check */ if (ipcomp_subopt == 0 || ipcomp_suboptlen == 0 ) break; /* XXX: just display the suboptions for now */ ND_PRINT((ndo, "\n\t\t%s Suboption #%u, length %u", tok2str(ipcpopt_compproto_subopt_values, "Unknown", ipcomp_subopt), ipcomp_subopt, ipcomp_suboptlen)); 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((ndo, " (length bogus, should be = 6)")); return 0; } ND_TCHECK2(*(p + 2), 4); ND_PRINT((ndo, ": %s", ipaddr_string(ndo, 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((ndo, "[|ipcp]")); return 0; } /* IP6CP config options */ static int print_ip6cp_config_options(netdissect_options *ndo, const u_char *p, int length) { int len, opt; if (length < 2) return 0; ND_TCHECK2(*p, 2); len = p[1]; opt = p[0]; if (length < len) return 0; if (len < 2) { ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", tok2str(ip6cpopt_values,"unknown",opt), opt, len)); return 0; } ND_PRINT((ndo, "\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((ndo, " (length bogus, should be = 10)")); return len; } ND_TCHECK2(*(p + 2), 8); ND_PRINT((ndo, ": %04x:%04x:%04x:%04x", EXTRACT_16BITS(p + 2), EXTRACT_16BITS(p + 4), EXTRACT_16BITS(p + 6), EXTRACT_16BITS(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((ndo, "[|ip6cp]")); return 0; } /* CCP config options */ static int print_ccp_config_options(netdissect_options *ndo, const u_char *p, int length) { int len, opt; if (length < 2) return 0; ND_TCHECK2(*p, 2); len = p[1]; opt = p[0]; if (length < len) return 0; if (len < 2) { ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", tok2str(ccpconfopts_values, "Unknown", opt), opt, len)); return 0; } ND_PRINT((ndo, "\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((ndo, " (length bogus, should be >= 3)")); return len; } ND_TCHECK(p[2]); ND_PRINT((ndo, ": Version: %u, Dictionary Bits: %u", p[2] >> 5, p[2] & 0x1f)); break; case CCPOPT_MVRCA: if (len < 4) { ND_PRINT((ndo, " (length bogus, should be >= 4)")); return len; } ND_TCHECK(p[3]); ND_PRINT((ndo, ": Features: %u, PxP: %s, History: %u, #CTX-ID: %u", (p[2] & 0xc0) >> 6, (p[2] & 0x20) ? "Enabled" : "Disabled", p[2] & 0x1f, p[3])); break; case CCPOPT_DEFLATE: if (len < 4) { ND_PRINT((ndo, " (length bogus, should be >= 4)")); return len; } ND_TCHECK(p[3]); ND_PRINT((ndo, ": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u", (p[2] & 0xf0) >> 4, ((p[2] & 0x0f) == 8) ? "zlib" : "unknown", p[2] & 0x0f, (p[3] & 0xfc) >> 2, 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((ndo, "[|ccp]")); return 0; } /* BACP config options */ static int print_bacp_config_options(netdissect_options *ndo, const u_char *p, int length) { int len, opt; if (length < 2) return 0; ND_TCHECK2(*p, 2); len = p[1]; opt = p[0]; if (length < len) return 0; if (len < 2) { ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", tok2str(bacconfopts_values, "Unknown", opt), opt, len)); return 0; } ND_PRINT((ndo, "\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((ndo, " (length bogus, should be = 6)")); return len; } ND_TCHECK_32BITS(p + 2); ND_PRINT((ndo, ": Magic-Num 0x%08x", EXTRACT_32BITS(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((ndo, "[|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, int length) { u_int caplen = ndo->ndo_snapend - p; u_char *b, *t, c; const u_char *s; u_int i; int proto; const void *se; if (caplen == 0) return; if (length <= 0) return; b = (u_char *)malloc(caplen); if (b == NULL) return; /* * Unescape all the data into a temporary, private, buffer. * Do this so that we dont overwrite the original packet * contents. */ for (s = p, t = b, i = caplen; i != 0; i--) { c = *s++; if (c == 0x7d) { if (i <= 1) break; i--; c = *s++ ^ 0x20; } *t++ = c; } se = ndo->ndo_snapend; ndo->ndo_snapend = t; length = t - b; /* now lets guess about the payload codepoint format */ if (length < 1) goto trunc; proto = *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 = EXTRACT_16BITS(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 = EXTRACT_16BITS(b+2); /* load the PPP proto-id */ handle_ppp(ndo, proto, b + 4, length - 4); break; default: /* last guess - proto must be a PPP proto-id */ handle_ppp(ndo, proto, b + 2, length - 2); break; } cleanup: ndo->ndo_snapend = se; free(b); return; trunc: ndo->ndo_snapend = se; free(b); ND_PRINT((ndo, "[|ppp]")); } /* PPP */ static void handle_ppp(netdissect_options *ndo, u_int proto, const u_char *p, 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((ndo, "compressed PPP data")); break; default: ND_PRINT((ndo, "%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, register const u_char *p, u_int length) { u_int proto,ppp_header; u_int olen = length; /* _o_riginal length */ u_int hdr_len = 0; /* * Here, we assume that p points to the Address and Control * field (if they present). */ if (length < 2) goto trunc; ND_TCHECK2(*p, 2); ppp_header = EXTRACT_16BITS(p); switch(ppp_header) { case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL): if (ndo->ndo_eflag) ND_PRINT((ndo, "In ")); p += 2; length -= 2; hdr_len += 2; break; case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL): if (ndo->ndo_eflag) ND_PRINT((ndo, "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; ND_TCHECK(*p); if (*p % 2) { proto = *p; /* PFC is used */ p++; length--; hdr_len++; } else { ND_TCHECK2(*p, 2); proto = EXTRACT_16BITS(p); p += 2; length -= 2; hdr_len += 2; } if (ndo->ndo_eflag) ND_PRINT((ndo, "%s (0x%04x), length %u: ", tok2str(ppptype2str, "unknown", proto), proto, olen)); handle_ppp(ndo, proto, p, length); return (hdr_len); trunc: ND_PRINT((ndo, "[|ppp]")); return (0); } /* PPP I/F printer */ u_int ppp_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p) { register u_int length = h->len; register u_int caplen = h->caplen; if (caplen < PPP_HDRLEN) { ND_PRINT((ndo, "[|ppp]")); return (caplen); } #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((ndo, "%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1])); #endif ppp_print(ndo, p, length); return (0); } /* * 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. */ u_int ppp_hdlc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p) { register u_int length = h->len; register u_int caplen = h->caplen; u_int proto; u_int hdrlen = 0; if (caplen < 2) { ND_PRINT((ndo, "[|ppp]")); return (caplen); } switch (p[0]) { case PPP_ADDRESS: if (caplen < 4) { ND_PRINT((ndo, "[|ppp]")); return (caplen); } if (ndo->ndo_eflag) ND_PRINT((ndo, "%02x %02x %d ", p[0], p[1], length)); p += 2; length -= 2; hdrlen += 2; proto = EXTRACT_16BITS(p); p += 2; length -= 2; hdrlen += 2; ND_PRINT((ndo, "%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto))); handle_ppp(ndo, proto, p, length); break; case CHDLC_UNICAST: case CHDLC_BCAST: return (chdlc_if_print(ndo, h, p)); default: if (caplen < 4) { ND_PRINT((ndo, "[|ppp]")); return (caplen); } if (ndo->ndo_eflag) ND_PRINT((ndo, "%02x %02x %d ", p[0], 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((ndo, "unknown addr %02x; ctrl %02x", p[0], p[1])); break; } return (hdrlen); } #define PPP_BSDI_HDRLEN 24 /* BSD/OS specific PPP printer */ u_int ppp_bsdos_if_print(netdissect_options *ndo _U_, const struct pcap_pkthdr *h _U_, register const u_char *p _U_) { register int hdrlength; #ifdef __bsdi__ register u_int length = h->len; register u_int caplen = h->caplen; uint16_t ptype; const u_char *q; int i; if (caplen < PPP_BSDI_HDRLEN) { ND_PRINT((ndo, "[|ppp]")); return (caplen) } hdrlength = 0; #if 0 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) { if (ndo->ndo_eflag) ND_PRINT((ndo, "%02x %02x ", p[0], p[1])); p += 2; hdrlength = 2; } if (ndo->ndo_eflag) ND_PRINT((ndo, "%d ", length)); /* Retrieve the protocol type */ if (*p & 01) { /* Compressed protocol field */ ptype = *p; if (ndo->ndo_eflag) ND_PRINT((ndo, "%02x ", ptype)); p++; hdrlength += 1; } else { /* Un-compressed protocol field */ ptype = EXTRACT_16BITS(p); if (ndo->ndo_eflag) ND_PRINT((ndo, "%04x ", ptype)); p += 2; hdrlength += 2; } #else ptype = 0; /*XXX*/ if (ndo->ndo_eflag) ND_PRINT((ndo, "%c ", p[SLC_DIR] ? 'O' : 'I')); if (p[SLC_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((ndo, "%02x %02x ", q[0], q[1])); ptype = EXTRACT_16BITS(&ph->phdr_type); if (ndo->ndo_eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) { ND_PRINT((ndo, "%s ", tok2str(ppptype2str, "proto-#%d", ptype))); } } else { if (ndo->ndo_eflag) { ND_PRINT((ndo, "LLH=[")); for (i = 0; i < p[SLC_LLHL]; i++) ND_PRINT((ndo, "%02x", q[i])); ND_PRINT((ndo, "] ")); } } } if (ndo->ndo_eflag) ND_PRINT((ndo, "%d ", length)); if (p[SLC_CHL]) { q = p + SLC_BPFHDRLEN + p[SLC_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((ndo, "CH=[")); for (i = 0; i < p[SLC_LLHL]; i++) ND_PRINT((ndo, "%02x", q[i])); ND_PRINT((ndo, "] ")); } 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((ndo, "%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype))); } printx: #else /* __bsdi */ hdrlength = 0; #endif /* __bsdi__ */ return (hdrlength); } /* * Local Variables: * c-style: whitesmith * c-basic-offset: 8 * End: */