2cadc3ba3a
Fix up Gerald's e-mail address. svn path=/trunk/; revision=3371
1517 lines
44 KiB
C
1517 lines
44 KiB
C
/* packet-ppp.c
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* Routines for ppp packet disassembly
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*
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* $Id: packet-ppp.c,v 1.63 2001/04/23 18:19:03 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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*
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* This file created and by Mike Hall <mlh@io.com>
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* Copyright 1998
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <glib.h>
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#include "prefs.h"
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#include "packet.h"
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#include "packet-ppp.h"
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#include "ppptypes.h"
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#include "etypes.h"
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#include "atalk-utils.h"
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#include "packet-chdlc.h"
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#include "packet-ip.h"
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#include "packet-ipx.h"
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#include "packet-vines.h"
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#include "nlpid.h"
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static int proto_ppp = -1;
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static gint ett_ppp = -1;
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static int proto_lcp = -1;
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static gint ett_lcp = -1;
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static gint ett_lcp_options = -1;
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static gint ett_lcp_mru_opt = -1;
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static gint ett_lcp_async_map_opt = -1;
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static gint ett_lcp_authprot_opt = -1;
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static gint ett_lcp_qualprot_opt = -1;
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static gint ett_lcp_magicnum_opt = -1;
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static gint ett_lcp_fcs_alternatives_opt = -1;
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static gint ett_lcp_numbered_mode_opt = -1;
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static gint ett_lcp_callback_opt = -1;
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static gint ett_lcp_multilink_ep_disc_opt = -1;
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static gint ett_lcp_internationalization_opt = -1;
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static int proto_ipcp = -1;
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static gint ett_ipcp = -1;
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static gint ett_ipcp_options = -1;
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static gint ett_ipcp_ipaddrs_opt = -1;
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static gint ett_ipcp_compressprot_opt = -1;
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static int proto_mp = -1;
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static int hf_mp_frag_first = -1;
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static int hf_mp_frag_last = -1;
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static int hf_mp_sequence_num = -1;
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static int ett_mp = -1;
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static int ett_mp_flags = -1;
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static dissector_table_t subdissector_table;
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static dissector_handle_t chdlc_handle;
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/* options */
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static gint ppp_fcs_decode = 0; /* 0 = No FCS, 1 = 16 bit FCS, 2 = 32 bit FCS */
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#define NO_FCS 0
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#define FCS_16 1
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#define FCS_32 2
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/* PPP definitions */
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static const value_string ppp_vals[] = {
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{PPP_IP, "IP" },
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{PPP_OSI, "OSI" },
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{PPP_AT, "Appletalk" },
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{PPP_IPX, "Netware IPX/SPX"},
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{PPP_VJC_COMP, "VJ compressed TCP"},
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{PPP_VJC_UNCOMP,"VJ uncompressed TCP"},
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{PPP_BPDU, "Bridging PDU"},
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{PPP_VINES, "Vines" },
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{PPP_MP, "Multilink"},
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{PPP_IPV6, "IPv6" },
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{PPP_COMP, "compressed packet" },
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{PPP_DEC_LB, "DEC LANBridge100 Spanning Tree"},
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{PPP_MPLS_UNI, "MPLS Unicast"},
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{PPP_MPLS_MULTI, "MPLS Multicast"},
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{PPP_IPCP, "IP Control Protocol" },
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{PPP_OSICP, "OSI Control Protocol" },
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{PPP_ATCP, "AppleTalk Control Protocol" },
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{PPP_IPXCP, "IPX Control Protocol" },
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{PPP_CCP, "Compression Control Protocol" },
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{PPP_LCP, "Link Control Protocol" },
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{PPP_PAP, "Password Authentication Protocol" },
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{PPP_LQR, "Link Quality Report protocol" },
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{PPP_CHAP, "Cryptographic Handshake Auth. Protocol" },
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{PPP_CBCP, "Callback Control Protocol" },
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{0, NULL }
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};
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/* CP (LCP, IPCP, etc.) codes.
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* from pppd fsm.h
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*/
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#define CONFREQ 1 /* Configuration Request */
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#define CONFACK 2 /* Configuration Ack */
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#define CONFNAK 3 /* Configuration Nak */
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#define CONFREJ 4 /* Configuration Reject */
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#define TERMREQ 5 /* Termination Request */
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#define TERMACK 6 /* Termination Ack */
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#define CODEREJ 7 /* Code Reject */
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static const value_string cp_vals[] = {
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{CONFREQ, "Configuration Request" },
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{CONFACK, "Configuration Ack" },
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{CONFNAK, "Configuration Nak" },
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{CONFREJ, "Configuration Reject" },
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{TERMREQ, "Termination Request" },
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{TERMACK, "Termination Ack" },
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{CODEREJ, "Code Reject" },
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{0, NULL } };
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/*
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* LCP-specific packet types.
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*/
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#define PROTREJ 8 /* Protocol Reject */
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#define ECHOREQ 9 /* Echo Request */
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#define ECHOREP 10 /* Echo Reply */
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#define DISCREQ 11 /* Discard Request */
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#define IDENT 12 /* Identification */
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#define TIMEREMAIN 13 /* Time remaining */
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#define CBCP_OPT 6 /* Use callback control protocol */
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static const value_string lcp_vals[] = {
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{CONFREQ, "Configuration Request" },
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{CONFACK, "Configuration Ack" },
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{CONFNAK, "Configuration Nak" },
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{CONFREJ, "Configuration Reject" },
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{TERMREQ, "Termination Request" },
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{TERMACK, "Termination Ack" },
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{CODEREJ, "Code Reject" },
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{PROTREJ, "Protocol Reject" },
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{ECHOREQ, "Echo Request" },
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{ECHOREP, "Echo Reply" },
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{DISCREQ, "Discard Request" },
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{IDENT, "Identification" },
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{TIMEREMAIN, "Time Remaining" },
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{0, NULL }
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};
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/*
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* Options. (LCP)
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*/
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#define CI_MRU 1 /* Maximum Receive Unit */
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#define CI_ASYNCMAP 2 /* Async Control Character Map */
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#define CI_AUTHTYPE 3 /* Authentication Type */
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#define CI_QUALITY 4 /* Quality Protocol */
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#define CI_MAGICNUMBER 5 /* Magic Number */
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#define CI_PCOMPRESSION 7 /* Protocol Field Compression */
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#define CI_ACCOMPRESSION 8 /* Address/Control Field Compression */
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#define CI_FCS_ALTERNATIVES 9 /* FCS Alternatives (RFC 1570) */
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#define CI_SELF_DESCRIBING_PAD 10 /* Self-Describing Pad (RFC 1570) */
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#define CI_NUMBERED_MODE 11 /* Numbered Mode (RFC 1663) */
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#define CI_CALLBACK 13 /* Callback (RFC 1570) */
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#define CI_COMPOUND_FRAMES 15 /* Compound frames (RFC 1570) */
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#define CI_MULTILINK_MRRU 17 /* Multilink MRRU (RFC 1717) */
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#define CI_MULTILINK_SSNH 18 /* Multilink Short Sequence Number
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Header (RFC 1717) */
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#define CI_MULTILINK_EP_DISC 19 /* Multilink Endpoint Discriminator
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(RFC 1717) */
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#define CI_DCE_IDENTIFIER 21 /* DCE Identifier */
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#define CI_MULTILINK_PLUS_PROC 22 /* Multilink Plus Procedure */
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#define CI_LINK_DISC_FOR_BACP 23 /* Link Discriminator for BACP
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(RFC 2125) */
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#define CI_LCP_AUTHENTICATION 24 /* LCP Authentication Option */
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#define CI_COBS 25 /* Consistent Overhead Byte
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Stuffing */
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#define CI_PREFIX_ELISION 26 /* Prefix elision */
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#define CI_MULTILINK_HDR_FMT 27 /* Multilink header format */
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#define CI_INTERNATIONALIZATION 28 /* Internationalization (RFC 2484) */
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#define CI_SDL_ON_SONET_SDH 29 /* Simple Data Link on SONET/SDH */
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static void dissect_lcp_mru_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
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int offset, guint length, frame_data *fd,
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proto_tree *tree);
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static void dissect_lcp_async_map_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
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int offset, guint length, frame_data *fd,
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proto_tree *tree);
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static void dissect_lcp_protocol_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
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int offset, guint length, frame_data *fd,
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proto_tree *tree);
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static void dissect_lcp_magicnumber_opt(const ip_tcp_opt *optp,
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tvbuff_t *tvb, int offset, guint length,
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frame_data *fd, proto_tree *tree);
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static void dissect_lcp_fcs_alternatives_opt(const ip_tcp_opt *optp,
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tvbuff_t *tvb, int offset, guint length,
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frame_data *fd, proto_tree *tree);
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static void dissect_lcp_numbered_mode_opt(const ip_tcp_opt *optp,
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tvbuff_t *tvb, int offset, guint length,
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frame_data *fd, proto_tree *tree);
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static void dissect_lcp_self_describing_pad_opt(const ip_tcp_opt *optp,
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tvbuff_t *tvb, int offset, guint length,
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frame_data *fd, proto_tree *tree);
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static void dissect_lcp_callback_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
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int offset, guint length, frame_data *fd,
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proto_tree *tree);
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static void dissect_lcp_multilink_mrru_opt(const ip_tcp_opt *optp,
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tvbuff_t *tvb, int offset, guint length,
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frame_data *fd, proto_tree *tree);
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static void dissect_lcp_multilink_ep_disc_opt(const ip_tcp_opt *optp,
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tvbuff_t *tvb, int offset, guint length,
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frame_data *fd, proto_tree *tree);
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static void dissect_lcp_bap_link_discriminator_opt(const ip_tcp_opt *optp,
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tvbuff_t *tvb, int offset, guint length,
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frame_data *fd, proto_tree *tree);
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static void dissect_lcp_internationalization_opt(const ip_tcp_opt *optp,
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tvbuff_t *tvb, int offset, guint length,
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frame_data *fd, proto_tree *tree);
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static void dissect_mp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static const ip_tcp_opt lcp_opts[] = {
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{
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CI_MRU,
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"Maximum Receive Unit",
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&ett_lcp_mru_opt,
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FIXED_LENGTH,
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4,
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dissect_lcp_mru_opt
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},
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{
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CI_ASYNCMAP,
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"Async Control Character Map",
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&ett_lcp_async_map_opt,
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FIXED_LENGTH,
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6,
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dissect_lcp_async_map_opt
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},
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{
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CI_AUTHTYPE,
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"Authentication protocol",
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&ett_lcp_authprot_opt,
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VARIABLE_LENGTH,
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4,
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dissect_lcp_protocol_opt
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},
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{
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CI_QUALITY,
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"Quality protocol",
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&ett_lcp_qualprot_opt,
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VARIABLE_LENGTH,
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4,
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dissect_lcp_protocol_opt
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},
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{
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CI_MAGICNUMBER,
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NULL,
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&ett_lcp_magicnum_opt,
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FIXED_LENGTH,
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6,
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dissect_lcp_magicnumber_opt
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},
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{
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CI_PCOMPRESSION,
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"Protocol field compression",
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NULL,
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FIXED_LENGTH,
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2,
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NULL
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},
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{
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CI_ACCOMPRESSION,
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"Address/control field compression",
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NULL,
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FIXED_LENGTH,
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2,
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NULL
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},
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{
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CI_FCS_ALTERNATIVES,
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NULL,
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&ett_lcp_fcs_alternatives_opt,
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FIXED_LENGTH,
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3,
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dissect_lcp_fcs_alternatives_opt
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},
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{
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CI_SELF_DESCRIBING_PAD,
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NULL,
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NULL,
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FIXED_LENGTH,
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3,
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dissect_lcp_self_describing_pad_opt
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},
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{
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CI_NUMBERED_MODE,
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"Numbered mode",
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&ett_lcp_numbered_mode_opt,
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VARIABLE_LENGTH,
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4,
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dissect_lcp_numbered_mode_opt
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},
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{
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CI_CALLBACK,
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"Callback",
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&ett_lcp_callback_opt,
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VARIABLE_LENGTH,
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3,
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dissect_lcp_callback_opt,
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},
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{
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CI_COMPOUND_FRAMES,
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"Compound frames",
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NULL,
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FIXED_LENGTH,
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2,
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NULL
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},
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{
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CI_MULTILINK_MRRU,
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NULL,
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NULL,
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FIXED_LENGTH,
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4,
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dissect_lcp_multilink_mrru_opt
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},
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{
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CI_MULTILINK_SSNH,
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"Use short sequence number headers",
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NULL,
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FIXED_LENGTH,
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2,
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NULL
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},
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{
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CI_MULTILINK_EP_DISC,
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"Multilink endpoint discriminator",
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&ett_lcp_multilink_ep_disc_opt,
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VARIABLE_LENGTH,
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3,
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dissect_lcp_multilink_ep_disc_opt,
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},
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{
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CI_DCE_IDENTIFIER,
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"DCE identifier",
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NULL,
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VARIABLE_LENGTH,
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2,
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NULL
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},
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{
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CI_MULTILINK_PLUS_PROC,
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"Multilink Plus Procedure",
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NULL,
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VARIABLE_LENGTH,
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2,
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NULL
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},
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{
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CI_LINK_DISC_FOR_BACP,
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NULL,
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NULL,
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FIXED_LENGTH,
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4,
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dissect_lcp_bap_link_discriminator_opt
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},
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{
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CI_LCP_AUTHENTICATION,
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"LCP authentication",
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NULL,
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VARIABLE_LENGTH,
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2,
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NULL
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},
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{
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CI_COBS,
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"Consistent Overhead Byte Stuffing",
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NULL,
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VARIABLE_LENGTH,
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2,
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NULL
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},
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{
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CI_PREFIX_ELISION,
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"Prefix elision",
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NULL,
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VARIABLE_LENGTH,
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2,
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NULL
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},
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{
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CI_MULTILINK_HDR_FMT,
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"Multilink header format",
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NULL,
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VARIABLE_LENGTH,
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2,
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NULL
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},
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{
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CI_INTERNATIONALIZATION,
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"Internationalization",
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&ett_lcp_internationalization_opt,
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VARIABLE_LENGTH,
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7,
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dissect_lcp_internationalization_opt
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},
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{
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CI_SDL_ON_SONET_SDH,
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"Simple data link on SONET/SDH",
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NULL,
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VARIABLE_LENGTH,
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2,
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NULL
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}
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};
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#define N_LCP_OPTS (sizeof lcp_opts / sizeof lcp_opts[0])
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/*
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* Options. (IPCP)
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*/
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#define CI_ADDRS 1 /* IP Addresses (deprecated) (RFC 1172) */
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#define CI_COMPRESSTYPE 2 /* Compression Type (RFC 1332) */
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#define CI_ADDR 3 /* IP Address (RFC 1332) */
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#define CI_MOBILE_IPv4 4 /* Mobile IPv4 (RFC 2290) */
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#define CI_MS_DNS1 129 /* Primary DNS value (RFC 1877) */
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#define CI_MS_WINS1 130 /* Primary WINS value (RFC 1877) */
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#define CI_MS_DNS2 131 /* Secondary DNS value (RFC 1877) */
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#define CI_MS_WINS2 132 /* Secondary WINS value (RFC 1877) */
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static void dissect_ipcp_addrs_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
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int offset, guint length, frame_data *fd,
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proto_tree *tree);
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static void dissect_ipcp_addr_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
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int offset, guint length, frame_data *fd,
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proto_tree *tree);
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|
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static const ip_tcp_opt ipcp_opts[] = {
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{
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CI_ADDRS,
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"IP addresses (deprecated)",
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&ett_ipcp_ipaddrs_opt,
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FIXED_LENGTH,
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10,
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dissect_ipcp_addrs_opt
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},
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{
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CI_COMPRESSTYPE,
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"IP compression protocol",
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&ett_ipcp_compressprot_opt,
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VARIABLE_LENGTH,
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4,
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dissect_lcp_protocol_opt
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},
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{
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CI_ADDR,
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"IP address",
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NULL,
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FIXED_LENGTH,
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6,
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dissect_ipcp_addr_opt
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},
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{
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CI_MOBILE_IPv4,
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"Mobile node's home IP address",
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NULL,
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FIXED_LENGTH,
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6,
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dissect_ipcp_addr_opt
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},
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{
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CI_MS_DNS1,
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"Primary DNS server IP address",
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NULL,
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FIXED_LENGTH,
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6,
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dissect_ipcp_addr_opt
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},
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{
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CI_MS_WINS1,
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"Primary WINS server IP address",
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NULL,
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FIXED_LENGTH,
|
|
6,
|
|
dissect_ipcp_addr_opt
|
|
},
|
|
{
|
|
CI_MS_DNS2,
|
|
"Secondary DNS server IP address",
|
|
NULL,
|
|
FIXED_LENGTH,
|
|
6,
|
|
dissect_ipcp_addr_opt
|
|
},
|
|
{
|
|
CI_MS_WINS2,
|
|
"Secondary WINS server IP address",
|
|
NULL,
|
|
FIXED_LENGTH,
|
|
6,
|
|
dissect_ipcp_addr_opt
|
|
}
|
|
};
|
|
|
|
#define N_IPCP_OPTS (sizeof ipcp_opts / sizeof ipcp_opts[0])
|
|
|
|
static void dissect_ppp(tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree);
|
|
|
|
const unsigned int fcstab_32[256] =
|
|
{
|
|
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
|
|
0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
|
|
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
|
|
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
|
|
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
|
|
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
|
|
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
|
|
0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
|
|
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
|
|
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
|
|
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
|
|
0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
|
|
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
|
|
0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
|
|
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
|
|
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
|
|
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
|
|
0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
|
|
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
|
|
0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
|
|
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
|
|
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
|
|
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
|
|
0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
|
|
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
|
|
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
|
|
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
|
|
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
|
|
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
|
|
0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
|
|
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
|
|
0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
|
|
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
|
|
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
|
|
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
|
|
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
|
|
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
|
|
0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
|
|
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
|
|
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
|
|
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
|
|
0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
|
|
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
|
|
0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
|
|
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
|
|
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
|
|
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
|
|
0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
|
|
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
|
|
0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
|
|
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
|
|
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
|
|
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
|
|
0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
|
|
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
|
|
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
|
|
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
|
|
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
|
|
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
|
|
0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
|
|
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
|
|
0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
|
|
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
|
|
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
|
|
};
|
|
|
|
const unsigned short fcstab_16[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
|
|
};
|
|
|
|
/*
|
|
*******************************************************************************
|
|
* DETAILS : Calculate a new FCS-16 given the current FCS-16 and the new data.
|
|
*******************************************************************************
|
|
*/
|
|
guint16
|
|
fcs16(register guint16 fcs,
|
|
tvbuff_t * tvbuff,
|
|
guint32 offset,
|
|
guint32 len)
|
|
{
|
|
guint8 val;
|
|
|
|
/* Check for Invalid Length */
|
|
if (len == 0)
|
|
return (0x0000);
|
|
while (len--) {
|
|
val = tvb_get_guint8(tvbuff, offset++);
|
|
fcs = (guint16)((fcs >> 8) & 0x00ff) ^
|
|
fcstab_16[((guint16)(fcs ^ (guint16)((val) & 0x00ff)) & 0x00ff)];
|
|
}
|
|
|
|
return (fcs ^ 0xffff);
|
|
}
|
|
|
|
/*
|
|
*******************************************************************************
|
|
* DETAILS : Calculate a new FCS-32 given the current FCS-32 and the new data.
|
|
*******************************************************************************
|
|
*/
|
|
guint32
|
|
fcs32(guint32 fcs,
|
|
tvbuff_t * tvbuff,
|
|
guint32 offset,
|
|
guint32 len)
|
|
{
|
|
guint8 val;
|
|
|
|
/* Check for invalid Length */
|
|
if (len == 0)
|
|
return (0x00000000);
|
|
|
|
while (len--) {
|
|
val = tvb_get_guint8(tvbuff, offset++);
|
|
fcs = (((fcs) >> 8) ^ fcstab_32[((fcs) ^ (val)) & 0xff]);
|
|
}
|
|
return (fcs ^ 0xffffffff);
|
|
}
|
|
|
|
void
|
|
capture_ppp_hdlc( const u_char *pd, int offset, packet_counts *ld ) {
|
|
if (pd[0] == CHDLC_ADDR_UNICAST || pd[0] == CHDLC_ADDR_MULTICAST) {
|
|
capture_chdlc(pd, offset, ld);
|
|
return;
|
|
}
|
|
switch (pntohs(&pd[offset + 2])) {
|
|
case PPP_IP:
|
|
capture_ip(pd, offset + 4, ld);
|
|
break;
|
|
case PPP_IPX:
|
|
capture_ipx(pd, offset + 4, ld);
|
|
break;
|
|
case PPP_VINES:
|
|
capture_vines(pd, offset + 4, ld);
|
|
break;
|
|
default:
|
|
ld->other++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_lcp_mru_opt(const ip_tcp_opt *optp, tvbuff_t *tvb, int offset,
|
|
guint length, frame_data *fd, proto_tree *tree)
|
|
{
|
|
proto_tree_add_text(tree, tvb, offset, length, "MRU: %u",
|
|
tvb_get_ntohs(tvb, offset + 2));
|
|
}
|
|
|
|
static void
|
|
dissect_lcp_async_map_opt(const ip_tcp_opt *optp, tvbuff_t *tvb, int offset,
|
|
guint length, frame_data *fd, proto_tree *tree)
|
|
{
|
|
proto_tree_add_text(tree, tvb, offset, length, "Async characters to map: 0x%08x",
|
|
tvb_get_ntohl(tvb, offset + 2));
|
|
}
|
|
|
|
static void
|
|
dissect_lcp_protocol_opt(const ip_tcp_opt *optp, tvbuff_t *tvb, int offset,
|
|
guint length, frame_data *fd, proto_tree *tree)
|
|
{
|
|
guint16 protocol;
|
|
proto_item *tf;
|
|
proto_tree *field_tree = NULL;
|
|
|
|
tf = proto_tree_add_text(tree, tvb, offset, length, "%s: %u byte%s",
|
|
optp->name, length, plurality(length, "", "s"));
|
|
field_tree = proto_item_add_subtree(tf, *optp->subtree_index);
|
|
offset += 2;
|
|
length -= 2;
|
|
protocol = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_text(field_tree, tvb, offset, 2, "%s: %s (0x%02x)", optp->name,
|
|
val_to_str(protocol, ppp_vals, "Unknown"), protocol);
|
|
offset += 2;
|
|
length -= 2;
|
|
if (length > 0)
|
|
proto_tree_add_text(field_tree, tvb, offset, length, "Data (%d byte%s)", length,
|
|
plurality(length, "", "s"));
|
|
}
|
|
|
|
static void
|
|
dissect_lcp_magicnumber_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
|
|
int offset, guint length, frame_data *fd,
|
|
proto_tree *tree)
|
|
{
|
|
proto_tree_add_text(tree, tvb, offset, length, "Magic number: 0x%08x",
|
|
tvb_get_ntohl(tvb, offset + 2));
|
|
}
|
|
|
|
static void
|
|
dissect_lcp_fcs_alternatives_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
|
|
int offset, guint length, frame_data *fd,
|
|
proto_tree *tree)
|
|
{
|
|
proto_item *tf;
|
|
proto_tree *field_tree = NULL;
|
|
guint8 alternatives;
|
|
|
|
alternatives = tvb_get_guint8(tvb, offset + 2);
|
|
tf = proto_tree_add_text(tree, tvb, offset, length, "%s: 0x%02x",
|
|
optp->name, alternatives);
|
|
field_tree = proto_item_add_subtree(tf, *optp->subtree_index);
|
|
offset += 2;
|
|
if (alternatives & 0x1)
|
|
proto_tree_add_text(field_tree, tvb, offset + 2, 1, "%s",
|
|
decode_boolean_bitfield(alternatives, 0x1, 8, "Null FCS", NULL));
|
|
if (alternatives & 0x2)
|
|
proto_tree_add_text(field_tree, tvb, offset + 2, 1, "%s",
|
|
decode_boolean_bitfield(alternatives, 0x2, 8, "CCITT 16-bit FCS", NULL));
|
|
if (alternatives & 0x4)
|
|
proto_tree_add_text(field_tree, tvb, offset + 2, 1, "%s",
|
|
decode_boolean_bitfield(alternatives, 0x4, 8, "CCITT 32-bit FCS", NULL));
|
|
}
|
|
|
|
static void
|
|
dissect_lcp_self_describing_pad_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
|
|
int offset, guint length, frame_data *fd,
|
|
proto_tree *tree)
|
|
{
|
|
proto_tree_add_text(tree, tvb, offset, length,
|
|
"Maximum octets of self-describing padding: %u",
|
|
tvb_get_guint8(tvb, offset + 2));
|
|
}
|
|
|
|
static void
|
|
dissect_lcp_numbered_mode_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
|
|
int offset, guint length, frame_data *fd,
|
|
proto_tree *tree)
|
|
{
|
|
proto_item *tf;
|
|
proto_tree *field_tree = NULL;
|
|
|
|
tf = proto_tree_add_text(tree, tvb, offset, length, "%s: %u byte%s",
|
|
optp->name, length, plurality(length, "", "s"));
|
|
field_tree = proto_item_add_subtree(tf, *optp->subtree_index);
|
|
offset += 2;
|
|
length -= 2;
|
|
proto_tree_add_text(field_tree, tvb, offset, 1, "Window: %u",
|
|
tvb_get_guint8(tvb, offset));
|
|
offset += 1;
|
|
length -= 1;
|
|
if (length > 0)
|
|
proto_tree_add_text(field_tree, tvb, offset, length, "Address (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
}
|
|
|
|
static const value_string callback_op_vals[] = {
|
|
{0, "Location is determined by user authentication" },
|
|
{1, "Message is dialing string" },
|
|
{2, "Message is location identifier" },
|
|
{3, "Message is E.164" },
|
|
{4, "Message is distinguished name" },
|
|
{0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_lcp_callback_opt(const ip_tcp_opt *optp, tvbuff_t *tvb, int offset,
|
|
guint length, frame_data *fd, proto_tree *tree)
|
|
{
|
|
proto_item *tf;
|
|
proto_tree *field_tree = NULL;
|
|
guint8 operation;
|
|
|
|
tf = proto_tree_add_text(tree, tvb, offset, length, "%s: %u byte%s",
|
|
optp->name, length, plurality(length, "", "s"));
|
|
field_tree = proto_item_add_subtree(tf, *optp->subtree_index);
|
|
offset += 2;
|
|
length -= 2;
|
|
operation = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(field_tree, tvb, offset, 1, "Operation: %s (0x%02x)",
|
|
val_to_str(operation, callback_op_vals, "Unknown"),
|
|
operation);
|
|
offset += 1;
|
|
length -= 1;
|
|
if (length > 0)
|
|
proto_tree_add_text(field_tree, tvb, offset, length, "Message (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
}
|
|
|
|
static void
|
|
dissect_lcp_multilink_mrru_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
|
|
int offset, guint length, frame_data *fd,
|
|
proto_tree *tree)
|
|
{
|
|
proto_tree_add_text(tree, tvb, offset, length, "Multilink MRRU: %u",
|
|
tvb_get_ntohs(tvb, offset + 2));
|
|
}
|
|
|
|
#define CLASS_NULL 0
|
|
#define CLASS_LOCAL 1
|
|
#define CLASS_IP 2
|
|
#define CLASS_IEEE_802_1 3
|
|
#define CLASS_PPP_MAGIC_NUMBER 4
|
|
#define CLASS_PSDN_DIRECTORY_NUMBER 5
|
|
|
|
static const value_string multilink_ep_disc_class_vals[] = {
|
|
{CLASS_NULL, "Null" },
|
|
{CLASS_LOCAL, "Locally assigned address" },
|
|
{CLASS_IP, "IP address" },
|
|
{CLASS_IEEE_802_1, "IEEE 802.1 globally assigned MAC address" },
|
|
{CLASS_PPP_MAGIC_NUMBER, "PPP magic-number block" },
|
|
{CLASS_PSDN_DIRECTORY_NUMBER, "Public switched network directory number" },
|
|
{0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_lcp_multilink_ep_disc_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
|
|
int offset, guint length, frame_data *fd,
|
|
proto_tree *tree)
|
|
{
|
|
proto_item *tf;
|
|
proto_tree *field_tree = NULL;
|
|
guint8 ep_disc_class;
|
|
|
|
tf = proto_tree_add_text(tree, tvb, offset, length, "%s: %u byte%s",
|
|
optp->name, length, plurality(length, "", "s"));
|
|
field_tree = proto_item_add_subtree(tf, *optp->subtree_index);
|
|
offset += 2;
|
|
length -= 2;
|
|
ep_disc_class = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(field_tree, tvb, offset, 1, "Class: %s (%u)",
|
|
val_to_str(ep_disc_class, multilink_ep_disc_class_vals, "Unknown"),
|
|
ep_disc_class);
|
|
offset += 1;
|
|
length -= 1;
|
|
if (length > 0) {
|
|
switch (ep_disc_class) {
|
|
|
|
case CLASS_NULL:
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address (%d byte%s), should have been empty",
|
|
length, plurality(length, "", "s"));
|
|
break;
|
|
|
|
case CLASS_LOCAL:
|
|
if (length > 20) {
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address (%d byte%s), should have been <20",
|
|
length, plurality(length, "", "s"));
|
|
} else {
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
}
|
|
break;
|
|
|
|
case CLASS_IP:
|
|
if (length != 4) {
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address (%d byte%s), should have been 4",
|
|
length, plurality(length, "", "s"));
|
|
} else {
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4)));
|
|
}
|
|
break;
|
|
|
|
case CLASS_IEEE_802_1:
|
|
if (length != 6) {
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address (%d byte%s), should have been 6",
|
|
length, plurality(length, "", "s"));
|
|
} else {
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address: %s", ether_to_str(tvb_get_ptr(tvb, offset, 6)));
|
|
}
|
|
break;
|
|
|
|
case CLASS_PPP_MAGIC_NUMBER:
|
|
/* XXX - dissect as 32-bit magic numbers */
|
|
if (length > 20) {
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address (%d byte%s), should have been <20",
|
|
length, plurality(length, "", "s"));
|
|
} else {
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
}
|
|
break;
|
|
|
|
case CLASS_PSDN_DIRECTORY_NUMBER:
|
|
if (length > 15) {
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address (%d byte%s), should have been <20",
|
|
length, plurality(length, "", "s"));
|
|
} else {
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
}
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_text(field_tree, tvb, offset, length,
|
|
"Address (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_lcp_bap_link_discriminator_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
|
|
int offset, guint length, frame_data *fd,
|
|
proto_tree *tree)
|
|
{
|
|
proto_tree_add_text(tree, tvb, offset, length,
|
|
"Link discriminator for BAP: 0x%04x",
|
|
tvb_get_ntohs(tvb, offset + 2));
|
|
}
|
|
|
|
/* Character set numbers from the IANA charset registry. */
|
|
static const value_string charset_num_vals[] = {
|
|
{105, "UTF-8" },
|
|
{0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_lcp_internationalization_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
|
|
int offset, guint length, frame_data *fd,
|
|
proto_tree *tree)
|
|
{
|
|
proto_item *tf;
|
|
proto_tree *field_tree = NULL;
|
|
guint32 charset;
|
|
|
|
tf = proto_tree_add_text(tree, tvb, offset, length, "%s: %u byte%s",
|
|
optp->name, length, plurality(length, "", "s"));
|
|
field_tree = proto_item_add_subtree(tf, *optp->subtree_index);
|
|
offset += 2;
|
|
length -= 2;
|
|
charset = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_text(field_tree, tvb, offset, 4, "Character set: %s (0x%04x)",
|
|
val_to_str(charset, charset_num_vals, "Unknown"),
|
|
charset);
|
|
offset += 4;
|
|
length -= 4;
|
|
if (length > 0) {
|
|
/* XXX - should be displayed as an ASCII string */
|
|
proto_tree_add_text(field_tree, tvb, offset, length, "Language tag (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_ipcp_addrs_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
|
|
int offset, guint length, frame_data *fd,
|
|
proto_tree *tree)
|
|
{
|
|
proto_item *tf;
|
|
proto_tree *field_tree = NULL;
|
|
|
|
tf = proto_tree_add_text(tree, tvb, offset, length, "%s: %u byte%s",
|
|
optp->name, length, plurality(length, "", "s"));
|
|
field_tree = proto_item_add_subtree(tf, *optp->subtree_index);
|
|
offset += 2;
|
|
length -= 2;
|
|
proto_tree_add_text(field_tree, tvb, offset, 4,
|
|
"Source IP address: %s",
|
|
ip_to_str(tvb_get_ptr(tvb, offset, 4)));
|
|
offset += 4;
|
|
length -= 4;
|
|
proto_tree_add_text(field_tree, tvb, offset, 4,
|
|
"Destination IP address: %s",
|
|
ip_to_str(tvb_get_ptr(tvb, offset, 4)));
|
|
}
|
|
|
|
static void dissect_ipcp_addr_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
|
|
int offset, guint length, frame_data *fd,
|
|
proto_tree *tree)
|
|
{
|
|
proto_tree_add_text(tree, tvb, offset, length, "%s: %s", optp->name,
|
|
ip_to_str(tvb_get_ptr(tvb, offset + 2, 4)));
|
|
}
|
|
|
|
static void
|
|
dissect_cp( tvbuff_t *tvb, int proto_id, int proto_subtree_index,
|
|
const value_string *proto_vals, int options_subtree_index,
|
|
const ip_tcp_opt *opts, int nopts, packet_info *pinfo, proto_tree *tree ) {
|
|
proto_item *ti;
|
|
proto_tree *fh_tree = NULL;
|
|
proto_item *tf;
|
|
proto_tree *field_tree;
|
|
|
|
guint8 code;
|
|
guint8 id;
|
|
int length, offset;
|
|
guint16 protocol;
|
|
|
|
code = tvb_get_guint8(tvb, 0);
|
|
id = tvb_get_guint8(tvb, 1);
|
|
length = tvb_get_ntohs(tvb, 2);
|
|
|
|
if(check_col(pinfo->fd, COL_INFO))
|
|
col_add_fstr(pinfo->fd, COL_INFO, "%s %s",
|
|
proto_get_protocol_short_name(proto_id),
|
|
val_to_str(code, proto_vals, "Unknown"));
|
|
|
|
if(tree) {
|
|
ti = proto_tree_add_item(tree, proto_id, tvb, 0, length, FALSE);
|
|
fh_tree = proto_item_add_subtree(ti, proto_subtree_index);
|
|
proto_tree_add_text(fh_tree, tvb, 0, 1, "Code: %s (0x%02x)",
|
|
val_to_str(code, proto_vals, "Unknown"), code);
|
|
proto_tree_add_text(fh_tree, tvb, 1, 1, "Identifier: 0x%02x",
|
|
id);
|
|
proto_tree_add_text(fh_tree, tvb, 2, 2, "Length: %u",
|
|
length);
|
|
}
|
|
offset = 4;
|
|
length -= 4;
|
|
|
|
switch (code) {
|
|
case CONFREQ:
|
|
case CONFACK:
|
|
case CONFNAK:
|
|
case CONFREJ:
|
|
if(tree) {
|
|
if (length > 0) {
|
|
tf = proto_tree_add_text(fh_tree, tvb, offset, length,
|
|
"Options: (%d byte%s)", length, plurality(length, "", "s"));
|
|
field_tree = proto_item_add_subtree(tf, options_subtree_index);
|
|
dissect_ip_tcp_options(tvb, offset, length, opts, nopts, -1,
|
|
pinfo->fd, field_tree);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case ECHOREQ:
|
|
case ECHOREP:
|
|
case DISCREQ:
|
|
case IDENT:
|
|
if(tree) {
|
|
proto_tree_add_text(fh_tree, tvb, offset, 4, "Magic number: 0x%08x",
|
|
tvb_get_ntohl(tvb, offset));
|
|
offset += 4;
|
|
length -= 4;
|
|
if (length > 0)
|
|
proto_tree_add_text(fh_tree, tvb, offset, length, "Message (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
}
|
|
break;
|
|
|
|
case TIMEREMAIN:
|
|
if(tree) {
|
|
proto_tree_add_text(fh_tree, tvb, offset, 4, "Magic number: 0x%08x",
|
|
tvb_get_ntohl(tvb, offset));
|
|
offset += 4;
|
|
length -= 4;
|
|
proto_tree_add_text(fh_tree, tvb, offset, 4, "Seconds remaining: %u",
|
|
tvb_get_ntohl(tvb, offset));
|
|
offset += 4;
|
|
length -= 4;
|
|
if (length > 0)
|
|
proto_tree_add_text(fh_tree, tvb, offset, length, "Message (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
}
|
|
break;
|
|
|
|
case PROTREJ:
|
|
if(tree) {
|
|
protocol = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_text(fh_tree, tvb, offset, 2, "Rejected protocol: %s (0x%04x)",
|
|
val_to_str(protocol, ppp_vals, "Unknown"), protocol);
|
|
offset += 2;
|
|
length -= 2;
|
|
if (length > 0)
|
|
proto_tree_add_text(fh_tree, tvb, offset, length, "Rejected packet (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
/* XXX - should be dissected as a PPP packet */
|
|
}
|
|
break;
|
|
|
|
case CODEREJ:
|
|
/* decode the rejected LCP packet here. */
|
|
if (length > 0)
|
|
proto_tree_add_text(fh_tree, tvb, offset, length, "Rejected packet (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
break;
|
|
|
|
case TERMREQ:
|
|
case TERMACK:
|
|
if (length > 0)
|
|
proto_tree_add_text(fh_tree, tvb, offset, length, "Data (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
break;
|
|
|
|
default:
|
|
if (length > 0)
|
|
proto_tree_add_text(fh_tree, tvb, offset, length, "Stuff (%d byte%s)",
|
|
length, plurality(length, "", "s"));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Protocol field compression */
|
|
#define PFC_BIT 0x01
|
|
|
|
static void
|
|
dissect_ppp_common( tvbuff_t *tvb, int offset, packet_info *pinfo,
|
|
proto_tree *tree, proto_tree *fh_tree,
|
|
proto_item *ti ) {
|
|
guint16 ppp_prot;
|
|
int proto_len;
|
|
tvbuff_t *next_tvb;
|
|
|
|
ppp_prot = tvb_get_guint8(tvb, offset);
|
|
if (ppp_prot & PFC_BIT) {
|
|
/* Compressed protocol field - just the byte we fetched. */
|
|
proto_len = 1;
|
|
} else {
|
|
/* Uncompressed protocol field - fetch all of it. */
|
|
ppp_prot = tvb_get_ntohs(tvb, offset);
|
|
proto_len = 2;
|
|
}
|
|
|
|
/* If "ti" is not null, it refers to the top-level "proto_ppp" item
|
|
for PPP, and was given a length equal to the length of any
|
|
stuff in the header preceding the protocol type, e.g. an HDLC
|
|
header, which is just "offset"; add the length of the protocol
|
|
type field to it. */
|
|
if (ti != NULL)
|
|
proto_item_set_len(ti, offset + proto_len);
|
|
|
|
if (tree) {
|
|
proto_tree_add_text(fh_tree, tvb, offset, proto_len, "Protocol: %s (0x%04x)",
|
|
val_to_str(ppp_prot, ppp_vals, "Unknown"), ppp_prot);
|
|
}
|
|
|
|
next_tvb = tvb_new_subset(tvb, offset + proto_len, -1, -1);
|
|
|
|
/* do lookup with the subdissector table */
|
|
if (!dissector_try_port(subdissector_table, ppp_prot, next_tvb, pinfo, tree)) {
|
|
if (check_col(pinfo->fd, COL_PROTOCOL))
|
|
col_add_fstr(pinfo->fd, COL_PROTOCOL, "0x%04x", ppp_prot);
|
|
if (check_col(pinfo->fd, COL_INFO))
|
|
col_add_fstr(pinfo->fd, COL_INFO, "PPP %s (0x%04x)",
|
|
val_to_str(ppp_prot, ppp_vals, "Unknown"), ppp_prot);
|
|
dissect_data(next_tvb, 0, pinfo, tree);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_lcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_cp(tvb, proto_lcp, ett_lcp, lcp_vals, ett_lcp_options,
|
|
lcp_opts, N_LCP_OPTS, pinfo, tree);
|
|
}
|
|
|
|
static void
|
|
dissect_ipcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_cp(tvb, proto_ipcp, ett_ipcp, cp_vals, ett_ipcp_options,
|
|
ipcp_opts, N_IPCP_OPTS, pinfo, tree);
|
|
}
|
|
|
|
#define MP_FRAG_MASK 0xC0
|
|
#define MP_FRAG(bits) ((bits) & MP_FRAG_MASK)
|
|
#define MP_FRAG_FIRST 0x80
|
|
#define MP_FRAG_LAST 0x40
|
|
#define MP_FRAG_RESERVED 0x3f
|
|
|
|
static const true_false_string frag_truth = {
|
|
"Yes",
|
|
"No"
|
|
};
|
|
|
|
/* According to RFC 1717, the length the MP header isn't indicated anywhere
|
|
in the header itself. It starts out at four bytes and can be
|
|
negotiated down to two using LCP. We currently assume that all
|
|
headers are four bytes. - gcc
|
|
*/
|
|
static void
|
|
dissect_mp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_tree *mp_tree, *hdr_tree;
|
|
proto_item *ti = NULL;
|
|
guint8 flags;
|
|
gchar *flag_str;
|
|
tvbuff_t *next_tvb;
|
|
|
|
if (check_col(pinfo->fd, COL_PROTOCOL))
|
|
col_set_str(pinfo->fd, COL_PROTOCOL, "PPP MP");
|
|
|
|
if (check_col(pinfo->fd, COL_INFO))
|
|
col_set_str(pinfo->fd, COL_INFO, "PPP Multilink");
|
|
|
|
flags = tvb_get_guint8(tvb, 0);
|
|
|
|
if (tree) {
|
|
switch (flags) {
|
|
case MP_FRAG_FIRST:
|
|
flag_str = "First";
|
|
break;
|
|
case MP_FRAG_LAST:
|
|
flag_str = "Last";
|
|
break;
|
|
case MP_FRAG_FIRST|MP_FRAG_LAST:
|
|
flag_str = "First, Last";
|
|
break;
|
|
default:
|
|
flag_str = "Unknown";
|
|
break;
|
|
}
|
|
ti = proto_tree_add_item(tree, proto_mp, tvb, 0, 4, FALSE);
|
|
mp_tree = proto_item_add_subtree(ti, ett_mp);
|
|
ti = proto_tree_add_text(mp_tree, tvb, 0, 1, "Fragment: 0x%2X (%s)",
|
|
flags, flag_str);
|
|
hdr_tree = proto_item_add_subtree(ti, ett_mp_flags);
|
|
proto_tree_add_boolean(hdr_tree, hf_mp_frag_first, tvb, 0, 1, flags);
|
|
proto_tree_add_boolean(hdr_tree, hf_mp_frag_last, tvb, 0, 1, flags),
|
|
proto_tree_add_text(hdr_tree, tvb, 0, 1, "%s",
|
|
decode_boolean_bitfield(flags, MP_FRAG_RESERVED, sizeof(flags) * 8,
|
|
"reserved", "reserved"));
|
|
proto_tree_add_item(mp_tree, hf_mp_sequence_num, tvb, 1, 3, FALSE);
|
|
}
|
|
|
|
if (tvb_reported_length_remaining(tvb, 4) > 0) {
|
|
next_tvb = tvb_new_subset(tvb, 4, -1, -1);
|
|
dissect_ppp(next_tvb, pinfo, tree);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handles PPP without HDLC framing, just a protocol field (RFC 1661).
|
|
*/
|
|
static void
|
|
dissect_ppp( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree ) {
|
|
proto_item *ti = NULL;
|
|
proto_tree *fh_tree = NULL;
|
|
|
|
if(tree) {
|
|
ti = proto_tree_add_item(tree, proto_ppp, tvb, 0, 0, FALSE);
|
|
fh_tree = proto_item_add_subtree(ti, ett_ppp);
|
|
}
|
|
|
|
dissect_ppp_common(tvb, 0, pinfo, tree, fh_tree, ti);
|
|
}
|
|
|
|
/*
|
|
* Handles link-layer encapsulations where the frame might be
|
|
* a PPP in HDLC-like Framing frame (RFC 1662) or a Cisco HDLC frame.
|
|
*/
|
|
static void
|
|
dissect_ppp_hdlc( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree ) {
|
|
proto_item *ti = NULL;
|
|
proto_tree *fh_tree = NULL;
|
|
guint8 byte0;
|
|
int proto_offset;
|
|
int rx_fcs_offset;
|
|
guint32 rx_fcs_exp;
|
|
guint32 rx_fcs_got;
|
|
|
|
byte0 = tvb_get_guint8(tvb, 0);
|
|
if (byte0 == CHDLC_ADDR_UNICAST || byte0 == CHDLC_ADDR_MULTICAST) {
|
|
/* Cisco HDLC encapsulation */
|
|
call_dissector(chdlc_handle, tvb, pinfo, tree);
|
|
}
|
|
|
|
/*
|
|
* XXX - should we have a routine that always dissects PPP, for use
|
|
* when we know the packets are PPP, not CHDLC?
|
|
*/
|
|
|
|
/* PPP HDLC encapsulation */
|
|
if (byte0 == 0xff)
|
|
proto_offset = 2;
|
|
else {
|
|
/* address and control are compressed (NULL) */
|
|
proto_offset = 0;
|
|
}
|
|
|
|
/* load the top pane info. This should be overwritten by
|
|
the next protocol in the stack */
|
|
|
|
if(check_col(pinfo->fd, COL_RES_DL_SRC))
|
|
col_set_str(pinfo->fd, COL_RES_DL_SRC, "N/A" );
|
|
if(check_col(pinfo->fd, COL_RES_DL_DST))
|
|
col_set_str(pinfo->fd, COL_RES_DL_DST, "N/A" );
|
|
if(check_col(pinfo->fd, COL_PROTOCOL))
|
|
col_set_str(pinfo->fd, COL_PROTOCOL, "PPP" );
|
|
|
|
if(tree) {
|
|
ti = proto_tree_add_item(tree, proto_ppp, tvb, 0, proto_offset, FALSE);
|
|
fh_tree = proto_item_add_subtree(ti, ett_ppp);
|
|
if (byte0 == 0xff) {
|
|
proto_tree_add_text(fh_tree, tvb, 0, 1, "Address: %02x",
|
|
tvb_get_guint8(tvb, 0));
|
|
proto_tree_add_text(fh_tree, tvb, 1, 1, "Control: %02x",
|
|
tvb_get_guint8(tvb, 1));
|
|
}
|
|
}
|
|
|
|
dissect_ppp_common(tvb, proto_offset, pinfo, tree, fh_tree, ti);
|
|
|
|
/* Calculate the FCS check */
|
|
/* XXX - deal with packets cut off by the snapshot length */
|
|
if (ppp_fcs_decode == FCS_16) {
|
|
rx_fcs_offset = tvb_length(tvb) - 2;
|
|
rx_fcs_exp = fcs16(0xFFFF, tvb, 0, rx_fcs_offset);
|
|
rx_fcs_got = tvb_get_letohs(tvb, rx_fcs_offset);
|
|
if (rx_fcs_got != rx_fcs_exp) {
|
|
proto_tree_add_text(fh_tree, tvb, rx_fcs_offset, 2, "FCS 16: %04x (incorrect, should be %04x)", rx_fcs_got, rx_fcs_exp);
|
|
} else {
|
|
proto_tree_add_text(fh_tree, tvb, rx_fcs_offset, 2, "FCS 16: %04x (correct)", rx_fcs_got);
|
|
}
|
|
} else if (ppp_fcs_decode == FCS_32) {
|
|
rx_fcs_offset = tvb_length(tvb) - 4;
|
|
rx_fcs_exp = fcs32(0xFFFFFFFF, tvb, 0, rx_fcs_offset);
|
|
rx_fcs_got = tvb_get_letohl(tvb, rx_fcs_offset);
|
|
if (rx_fcs_got != rx_fcs_exp) {
|
|
proto_tree_add_text(fh_tree, tvb, rx_fcs_offset, 4, "FCS 32: %08x (incorrect, should be %08x) ", rx_fcs_got, rx_fcs_exp);
|
|
} else {
|
|
proto_tree_add_text(fh_tree, tvb, rx_fcs_offset, 4, "FCS 32: %08x (correct)", rx_fcs_got);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_ppp(void)
|
|
{
|
|
/* static hf_register_info hf[] = {
|
|
{ &variable,
|
|
{ "Name", "ppp.abbreviation", TYPE, VALS_POINTER }},
|
|
};*/
|
|
static gint *ett[] = {
|
|
&ett_ppp,
|
|
};
|
|
|
|
static enum_val_t ppp_options[] = {
|
|
{"None", 0},
|
|
{"16-Bit", 1},
|
|
{"32-Bit", 2},
|
|
{NULL, -1}
|
|
};
|
|
|
|
module_t *ppp_module;
|
|
|
|
proto_ppp = proto_register_protocol("Point-to-Point Protocol",
|
|
"PPP", "ppp");
|
|
/* proto_register_field_array(proto_ppp, hf, array_length(hf));*/
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
/* subdissector code */
|
|
subdissector_table = register_dissector_table("ppp.protocol");
|
|
|
|
register_dissector("ppp_hdlc", dissect_ppp_hdlc, proto_ppp);
|
|
register_dissector("ppp", dissect_ppp, proto_ppp);
|
|
|
|
/* Register the preferences for the ppp protocol */
|
|
ppp_module = prefs_register_protocol(proto_ppp, NULL);
|
|
|
|
prefs_register_enum_preference(ppp_module,
|
|
"ppp_fcs",
|
|
"PPP Frame Checksum",
|
|
"PPP Frame Checksum",
|
|
&ppp_fcs_decode,
|
|
ppp_options, FALSE);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_ppp(void)
|
|
{
|
|
/*
|
|
* Get a handle for the CHDLC dissector.
|
|
*/
|
|
chdlc_handle = find_dissector("chdlc");
|
|
|
|
dissector_add("wtap_encap", WTAP_ENCAP_PPP, dissect_ppp_hdlc, proto_ppp);
|
|
dissector_add("wtap_encap", WTAP_ENCAP_PPP_WITH_PHDR, dissect_ppp_hdlc, proto_ppp);
|
|
dissector_add("fr.ietf", NLPID_PPP, dissect_ppp, proto_ppp);
|
|
dissector_add("gre.proto", ETHERTYPE_PPP, dissect_ppp_hdlc, proto_ppp);
|
|
}
|
|
|
|
void
|
|
proto_register_mp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_mp_frag_first,
|
|
{ "First fragment", "mp.first", FT_BOOLEAN, 8,
|
|
TFS(&frag_truth), MP_FRAG_FIRST, "" }},
|
|
|
|
{ &hf_mp_frag_last,
|
|
{ "Last fragment", "mp.last", FT_BOOLEAN, 8,
|
|
TFS(&frag_truth), MP_FRAG_LAST, "" }},
|
|
|
|
{ &hf_mp_sequence_num,
|
|
{ "Sequence number", "mp.seq", FT_UINT24, BASE_DEC, NULL, 0x0,
|
|
"" }}
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_mp,
|
|
&ett_mp_flags,
|
|
};
|
|
|
|
proto_mp = proto_register_protocol("PPP Multilink Protocol", "PPP MP", "mp");
|
|
proto_register_field_array(proto_mp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_mp(void)
|
|
{
|
|
dissector_add("ppp.protocol", PPP_MP, dissect_mp, proto_mp);
|
|
}
|
|
|
|
void
|
|
proto_register_lcp(void)
|
|
{
|
|
static gint *ett[] = {
|
|
&ett_lcp,
|
|
&ett_lcp_options,
|
|
&ett_lcp_mru_opt,
|
|
&ett_lcp_async_map_opt,
|
|
&ett_lcp_authprot_opt,
|
|
&ett_lcp_qualprot_opt,
|
|
&ett_lcp_magicnum_opt,
|
|
&ett_lcp_fcs_alternatives_opt,
|
|
&ett_lcp_numbered_mode_opt,
|
|
&ett_lcp_callback_opt,
|
|
&ett_lcp_multilink_ep_disc_opt,
|
|
&ett_lcp_internationalization_opt,
|
|
};
|
|
|
|
proto_lcp = proto_register_protocol("PPP Link Control Protocol", "PPP LCP",
|
|
"lcp");
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_lcp(void)
|
|
{
|
|
dissector_add("ppp.protocol", PPP_LCP, dissect_lcp, proto_lcp);
|
|
}
|
|
|
|
void
|
|
proto_register_ipcp(void)
|
|
{
|
|
static gint *ett[] = {
|
|
&ett_ipcp,
|
|
&ett_ipcp_options,
|
|
&ett_ipcp_ipaddrs_opt,
|
|
&ett_ipcp_compressprot_opt,
|
|
};
|
|
|
|
proto_ipcp = proto_register_protocol("PPP IP Control Protocol", "PPP IPCP",
|
|
"ipcp");
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_ipcp(void)
|
|
{
|
|
dissector_add("ppp.protocol", PPP_IPCP, dissect_ipcp, proto_ipcp);
|
|
}
|