/* packet-ppp.c
* Routines for ppp packet disassembly
*
- * $Id: packet-ppp.c,v 1.10 1999/03/23 03:14:43 gram Exp $
+ * $Id: packet-ppp.c,v 1.50 2001/01/03 07:53:43 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
#endif
#include <glib.h>
+#include "prefs.h"
#include "packet.h"
+#include "packet-ppp.h"
+#include "ppptypes.h"
+#include "packet-atalk.h"
+#include "packet-ip.h"
+#include "packet-ipv6.h"
+#include "packet-ipx.h"
+#include "packet-vines.h"
+
+static int proto_ppp = -1;
+
+static gint ett_ppp = -1;
+static gint ett_ipcp = -1;
+static gint ett_ipcp_options = -1;
+static gint ett_ipcp_ipaddrs_opt = -1;
+static gint ett_ipcp_compressprot_opt = -1;
+static gint ett_lcp = -1;
+static gint ett_lcp_options = -1;
+static gint ett_lcp_mru_opt = -1;
+static gint ett_lcp_async_map_opt = -1;
+static gint ett_lcp_authprot_opt = -1;
+static gint ett_lcp_qualprot_opt = -1;
+static gint ett_lcp_magicnum_opt = -1;
+static gint ett_lcp_fcs_alternatives_opt = -1;
+static gint ett_lcp_numbered_mode_opt = -1;
+static gint ett_lcp_callback_opt = -1;
+static gint ett_lcp_multilink_ep_disc_opt = -1;
+static gint ett_lcp_internationalization_opt = -1;
+
+static dissector_table_t subdissector_table;
+
+static int proto_mp = -1;
+static int hf_mp_frag_first = -1;
+static int hf_mp_frag_last = -1;
+static int hf_mp_sequence_num = -1;
+
+static int ett_mp = -1;
+static int ett_mp_flags = -1;
+
+/* options */
+static gint ppp_fcs_decode = 0; /* 0 = No FCS, 1 = 16 bit FCS, 2 = 32 bit FCS */
+#define NO_FCS 0
+#define FCS_16 1
+#define FCS_32 2
/* PPP structs and definitions */
guint16 ppp_prot;
} e_ppphdr;
+static const value_string ppp_vals[] = {
+ {PPP_IP, "IP" },
+ {PPP_AT, "Appletalk" },
+ {PPP_IPX, "Netware IPX/SPX"},
+ {PPP_VJC_COMP, "VJ compressed TCP"},
+ {PPP_VJC_UNCOMP,"VJ uncompressed TCP"},
+ {PPP_VINES, "Vines" },
+ {PPP_MP, "Multilink"},
+ {PPP_IPV6, "IPv6" },
+ {PPP_COMP, "compressed packet" },
+ {PPP_IPCP, "IP Control Protocol" },
+ {PPP_ATCP, "AppleTalk Control Protocol" },
+ {PPP_IPXCP, "IPX Control Protocol" },
+ {PPP_CCP, "Compression Control Protocol" },
+ {PPP_LCP, "Link Control Protocol" },
+ {PPP_PAP, "Password Authentication Protocol" },
+ {PPP_LQR, "Link Quality Report protocol" },
+ {PPP_CHAP, "Cryptographic Handshake Auth. Protocol" },
+ {PPP_CBCP, "Callback Control Protocol" },
+ {PPP_MPLS_UNI, "MPLS Uni-cast"},
+ {PPP_MPLS_MULTI, "MPLS Multi-cast"},
+ {CISCO_IP, "CISCO HDLC IP"},
+ {CISCO_SLARP, "CISCO HDLC SLARP"},
+ {0, NULL }
+};
+
+/* CP (LCP, IPCP, etc.) codes.
+ * from pppd fsm.h
+ */
+#define CONFREQ 1 /* Configuration Request */
+#define CONFACK 2 /* Configuration Ack */
+#define CONFNAK 3 /* Configuration Nak */
+#define CONFREJ 4 /* Configuration Reject */
+#define TERMREQ 5 /* Termination Request */
+#define TERMACK 6 /* Termination Ack */
+#define CODEREJ 7 /* Code Reject */
+
+static const value_string cp_vals[] = {
+ {CONFREQ, "Configuration Request" },
+ {CONFACK, "Configuration Ack" },
+ {CONFNAK, "Configuration Nak" },
+ {CONFREJ, "Configuration Reject" },
+ {TERMREQ, "Termination Request" },
+ {TERMACK, "Termination Ack" },
+ {CODEREJ, "Code Reject" },
+ {0, NULL } };
+
+/*
+ * LCP-specific packet types.
+ */
+#define PROTREJ 8 /* Protocol Reject */
+#define ECHOREQ 9 /* Echo Request */
+#define ECHOREP 10 /* Echo Reply */
+#define DISCREQ 11 /* Discard Request */
+#define IDENT 12 /* Identification */
+#define TIMEREMAIN 13 /* Time remaining */
+
+#define CBCP_OPT 6 /* Use callback control protocol */
+
+static const value_string lcp_vals[] = {
+ {CONFREQ, "Configuration Request" },
+ {CONFACK, "Configuration Ack" },
+ {CONFNAK, "Configuration Nak" },
+ {CONFREJ, "Configuration Reject" },
+ {TERMREQ, "Termination Request" },
+ {TERMACK, "Termination Ack" },
+ {CODEREJ, "Code Reject" },
+ {PROTREJ, "Protocol Reject" },
+ {ECHOREQ, "Echo Request" },
+ {ECHOREP, "Echo Reply" },
+ {DISCREQ, "Discard Request" },
+ {IDENT, "Identification" },
+ {TIMEREMAIN, "Time Remaining" },
+ {0, NULL }
+};
+
+/*
+ * Options. (LCP)
+ */
+#define CI_MRU 1 /* Maximum Receive Unit */
+#define CI_ASYNCMAP 2 /* Async Control Character Map */
+#define CI_AUTHTYPE 3 /* Authentication Type */
+#define CI_QUALITY 4 /* Quality Protocol */
+#define CI_MAGICNUMBER 5 /* Magic Number */
+#define CI_PCOMPRESSION 7 /* Protocol Field Compression */
+#define CI_ACCOMPRESSION 8 /* Address/Control Field Compression */
+#define CI_FCS_ALTERNATIVES 9 /* FCS Alternatives (RFC 1570) */
+#define CI_SELF_DESCRIBING_PAD 10 /* Self-Describing Pad (RFC 1570) */
+#define CI_NUMBERED_MODE 11 /* Numbered Mode (RFC 1663) */
+#define CI_CALLBACK 13 /* Callback (RFC 1570) */
+#define CI_COMPOUND_FRAMES 15 /* Compound frames (RFC 1570) */
+#define CI_MULTILINK_MRRU 17 /* Multilink MRRU (RFC 1717) */
+#define CI_MULTILINK_SSNH 18 /* Multilink Short Sequence Number
+ Header (RFC 1717) */
+#define CI_MULTILINK_EP_DISC 19 /* Multilink Endpoint Discriminator
+ (RFC 1717) */
+#define CI_DCE_IDENTIFIER 21 /* DCE Identifier */
+#define CI_MULTILINK_PLUS_PROC 22 /* Multilink Plus Procedure */
+#define CI_LINK_DISC_FOR_BACP 23 /* Link Discriminator for BACP
+ (RFC 2125) */
+#define CI_LCP_AUTHENTICATION 24 /* LCP Authentication Option */
+#define CI_COBS 25 /* Consistent Overhead Byte
+ Stuffing */
+#define CI_PREFIX_ELISION 26 /* Prefix elision */
+#define CI_MULTILINK_HDR_FMT 27 /* Multilink header format */
+#define CI_INTERNATIONALIZATION 28 /* Internationalization (RFC 2484) */
+#define CI_SDL_ON_SONET_SDH 29 /* Simple Data Link on SONET/SDH */
+
+static void dissect_lcp_mru_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
+ int offset, guint length, frame_data *fd,
+ proto_tree *tree);
+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);
+static void dissect_lcp_protocol_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
+ int offset, guint length, frame_data *fd,
+ proto_tree *tree);
+static void dissect_lcp_magicnumber_opt(const ip_tcp_opt *optp,
+ tvbuff_t *tvb, int offset, guint length,
+ frame_data *fd, proto_tree *tree);
+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);
+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);
+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);
+static void dissect_lcp_callback_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
+ int offset, guint length, frame_data *fd,
+ proto_tree *tree);
+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);
+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);
+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);
+static void dissect_lcp_internationalization_opt(const ip_tcp_opt *optp,
+ tvbuff_t *tvb, int offset, guint length,
+ frame_data *fd, proto_tree *tree);
+static void dissect_mp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
-/* Protocol types, from Linux "ppp_defs.h" and
+static const ip_tcp_opt lcp_opts[] = {
+ {
+ CI_MRU,
+ "Maximum Receive Unit",
+ &ett_lcp_mru_opt,
+ FIXED_LENGTH,
+ 4,
+ dissect_lcp_mru_opt
+ },
+ {
+ CI_ASYNCMAP,
+ "Async Control Character Map",
+ &ett_lcp_async_map_opt,
+ FIXED_LENGTH,
+ 6,
+ dissect_lcp_async_map_opt
+ },
+ {
+ CI_AUTHTYPE,
+ "Authentication protocol",
+ &ett_lcp_authprot_opt,
+ VARIABLE_LENGTH,
+ 4,
+ dissect_lcp_protocol_opt
+ },
+ {
+ CI_QUALITY,
+ "Quality protocol",
+ &ett_lcp_qualprot_opt,
+ VARIABLE_LENGTH,
+ 4,
+ dissect_lcp_protocol_opt
+ },
+ {
+ CI_MAGICNUMBER,
+ NULL,
+ &ett_lcp_magicnum_opt,
+ FIXED_LENGTH,
+ 6,
+ dissect_lcp_magicnumber_opt
+ },
+ {
+ CI_PCOMPRESSION,
+ "Protocol field compression",
+ NULL,
+ FIXED_LENGTH,
+ 2,
+ NULL
+ },
+ {
+ CI_ACCOMPRESSION,
+ "Address/control field compression",
+ NULL,
+ FIXED_LENGTH,
+ 2,
+ NULL
+ },
+ {
+ CI_FCS_ALTERNATIVES,
+ NULL,
+ &ett_lcp_fcs_alternatives_opt,
+ FIXED_LENGTH,
+ 3,
+ dissect_lcp_fcs_alternatives_opt
+ },
+ {
+ CI_SELF_DESCRIBING_PAD,
+ NULL,
+ NULL,
+ FIXED_LENGTH,
+ 3,
+ dissect_lcp_self_describing_pad_opt
+ },
+ {
+ CI_NUMBERED_MODE,
+ "Numbered mode",
+ &ett_lcp_numbered_mode_opt,
+ VARIABLE_LENGTH,
+ 4,
+ dissect_lcp_numbered_mode_opt
+ },
+ {
+ CI_CALLBACK,
+ "Callback",
+ &ett_lcp_callback_opt,
+ VARIABLE_LENGTH,
+ 3,
+ dissect_lcp_callback_opt,
+ },
+ {
+ CI_COMPOUND_FRAMES,
+ "Compound frames",
+ NULL,
+ FIXED_LENGTH,
+ 2,
+ NULL
+ },
+ {
+ CI_MULTILINK_MRRU,
+ NULL,
+ NULL,
+ FIXED_LENGTH,
+ 4,
+ dissect_lcp_multilink_mrru_opt
+ },
+ {
+ CI_MULTILINK_SSNH,
+ "Use short sequence number headers",
+ NULL,
+ FIXED_LENGTH,
+ 2,
+ NULL
+ },
+ {
+ CI_MULTILINK_EP_DISC,
+ "Multilink endpoint discriminator",
+ &ett_lcp_multilink_ep_disc_opt,
+ VARIABLE_LENGTH,
+ 3,
+ dissect_lcp_multilink_ep_disc_opt,
+ },
+ {
+ CI_DCE_IDENTIFIER,
+ "DCE identifier",
+ NULL,
+ VARIABLE_LENGTH,
+ 2,
+ NULL
+ },
+ {
+ CI_MULTILINK_PLUS_PROC,
+ "Multilink Plus Procedure",
+ NULL,
+ VARIABLE_LENGTH,
+ 2,
+ NULL
+ },
+ {
+ CI_LINK_DISC_FOR_BACP,
+ NULL,
+ NULL,
+ FIXED_LENGTH,
+ 4,
+ dissect_lcp_bap_link_discriminator_opt
+ },
+ {
+ CI_LCP_AUTHENTICATION,
+ "LCP authentication",
+ NULL,
+ VARIABLE_LENGTH,
+ 2,
+ NULL
+ },
+ {
+ CI_COBS,
+ "Consistent Overhead Byte Stuffing",
+ NULL,
+ VARIABLE_LENGTH,
+ 2,
+ NULL
+ },
+ {
+ CI_PREFIX_ELISION,
+ "Prefix elision",
+ NULL,
+ VARIABLE_LENGTH,
+ 2,
+ NULL
+ },
+ {
+ CI_MULTILINK_HDR_FMT,
+ "Multilink header format",
+ NULL,
+ VARIABLE_LENGTH,
+ 2,
+ NULL
+ },
+ {
+ CI_INTERNATIONALIZATION,
+ "Internationalization",
+ &ett_lcp_internationalization_opt,
+ VARIABLE_LENGTH,
+ 7,
+ dissect_lcp_internationalization_opt
+ },
+ {
+ CI_SDL_ON_SONET_SDH,
+ "Simple data link on SONET/SDH",
+ NULL,
+ VARIABLE_LENGTH,
+ 2,
+ NULL
+ }
+};
- http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
+#define N_LCP_OPTS (sizeof lcp_opts / sizeof lcp_opts[0])
+/*
+ * Options. (IPCP)
*/
-#define PPP_IP 0x21 /* Internet Protocol */
-#define PPP_AT 0x29 /* AppleTalk Protocol */
-#define PPP_IPX 0x2b /* IPX protocol */
-#define PPP_VJC_COMP 0x2d /* VJ compressed TCP */
-#define PPP_VJC_UNCOMP 0x2f /* VJ uncompressed TCP */
-#define PPP_VINES 0x35 /* Banyan Vines */
-#define PPP_IPV6 0x57 /* Internet Protocol Version 6 */
-#define PPP_COMP 0xfd /* compressed packet */
-#define PPP_IPCP 0x8021 /* IP Control Protocol */
-#define PPP_ATCP 0x8029 /* AppleTalk Control Protocol */
-#define PPP_IPXCP 0x802b /* IPX Control Protocol */
-#define PPP_CCP 0x80fd /* Compression Control Protocol */
-#define PPP_LCP 0xc021 /* Link Control Protocol */
-#define PPP_PAP 0xc023 /* Password Authentication Protocol */
-#define PPP_LQR 0xc025 /* Link Quality Report protocol */
-#define PPP_CHAP 0xc223 /* Cryptographic Handshake Auth. Protocol */
-#define PPP_CBCP 0xc029 /* Callback Control Protocol */
+#define CI_ADDRS 1 /* IP Addresses (deprecated) (RFC 1172) */
+#define CI_COMPRESSTYPE 2 /* Compression Type (RFC 1332) */
+#define CI_ADDR 3 /* IP Address (RFC 1332) */
+#define CI_MOBILE_IPv4 4 /* Mobile IPv4 (RFC 2290) */
+#define CI_MS_DNS1 129 /* Primary DNS value (RFC 1877) */
+#define CI_MS_WINS1 130 /* Primary WINS value (RFC 1877) */
+#define CI_MS_DNS2 131 /* Secondary DNS value (RFC 1877) */
+#define CI_MS_WINS2 132 /* Secondary WINS value (RFC 1877) */
+
+static void dissect_ipcp_addrs_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
+ int offset, guint length, frame_data *fd,
+ proto_tree *tree);
+static void dissect_ipcp_addr_opt(const ip_tcp_opt *optp, tvbuff_t *tvb,
+ int offset, guint length, frame_data *fd,
+ proto_tree *tree);
+
+static const ip_tcp_opt ipcp_opts[] = {
+ {
+ CI_ADDRS,
+ "IP addresses (deprecated)",
+ &ett_ipcp_ipaddrs_opt,
+ FIXED_LENGTH,
+ 10,
+ dissect_ipcp_addrs_opt
+ },
+ {
+ CI_COMPRESSTYPE,
+ "IP compression protocol",
+ &ett_ipcp_compressprot_opt,
+ VARIABLE_LENGTH,
+ 4,
+ dissect_lcp_protocol_opt
+ },
+ {
+ CI_ADDR,
+ "IP address",
+ NULL,
+ FIXED_LENGTH,
+ 6,
+ dissect_ipcp_addr_opt
+ },
+ {
+ CI_MOBILE_IPv4,
+ "Mobile node's home IP address",
+ NULL,
+ FIXED_LENGTH,
+ 6,
+ dissect_ipcp_addr_opt
+ },
+ {
+ CI_MS_DNS1,
+ "Primary DNS server IP address",
+ NULL,
+ FIXED_LENGTH,
+ 6,
+ dissect_ipcp_addr_opt
+ },
+ {
+ CI_MS_WINS1,
+ "Primary WINS server IP address",
+ NULL,
+ 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])
+
+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( const u_char *pd, guint32 cap_len, packet_counts *ld ) {
- switch (pntohs(&pd[2])) {
+capture_ppp( const u_char *pd, int offset, packet_counts *ld ) {
+ switch (pntohs(&pd[offset + 2])) {
case PPP_IP:
- capture_ip(pd, 4, cap_len, ld);
+ case CISCO_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++;
}
}
-void
-dissect_ppp( const u_char *pd, frame_data *fd, proto_tree *tree ) {
- e_ppphdr ph;
- proto_tree *fh_tree;
+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, const char *proto_short_name,
+ const char *proto_long_name, 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;
- static const value_string ppp_vals[] = {
- {PPP_IP, "IP" },
- {PPP_AT, "Appletalk" },
- {PPP_IPX, "Netware IPX/SPX"},
- {PPP_VINES, "Vines" },
- {PPP_IPV6, "IPv6" },
- {0, NULL } };
+ guint8 code;
+ guint8 id;
+ int length, offset;
+ guint16 protocol;
- ph.ppp_addr = pd[0];
- ph.ppp_ctl = pd[1];
- ph.ppp_prot = pntohs(&pd[2]);
+ 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, "%sCP %s", proto_short_name,
+ val_to_str(code, proto_vals, "Unknown"));
- /* load the top pane info. This should be overwritten by
- the next protocol in the stack */
- if(check_col(fd, COL_RES_DL_SRC))
- col_add_str(fd, COL_RES_DL_SRC, "N/A" );
- if(check_col(fd, COL_RES_DL_DST))
- col_add_str(fd, COL_RES_DL_DST, "N/A" );
- if(check_col(fd, COL_PROTOCOL))
- col_add_str(fd, COL_PROTOCOL, "N/A" );
- if(check_col(fd, COL_INFO))
- col_add_str(fd, COL_INFO, "PPP" );
-
- /* populate a tree in the second pane with the status of the link
- layer (ie none) */
if(tree) {
- ti = proto_tree_add_item(tree, 0, 4, "Point-to-Point Protocol" );
- fh_tree = proto_tree_new();
- proto_item_add_subtree(ti, fh_tree, ETT_PPP);
- proto_tree_add_item(fh_tree, 0, 1, "Address: %02x", ph.ppp_addr);
- proto_tree_add_item(fh_tree, 1, 1, "Control: %02x", ph.ppp_ctl);
- proto_tree_add_item(fh_tree, 2, 2, "Protocol: %s (0x%04x)",
- val_to_str(ph.ppp_prot, ppp_vals, "Unknown"), ph.ppp_prot);
+ ti = proto_tree_add_text(tree, tvb, 0, 4, "%s Control Protocol",
+ proto_long_name);
+ 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 (ph.ppp_prot) {
- case PPP_IP:
- dissect_ip(pd, 4, fd, tree);
+ 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 PPP_AT:
- dissect_ddp(pd, 4, fd, tree);
+
+ 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 PPP_IPX:
- dissect_ipx(pd, 4, fd, tree);
+
+ 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 PPP_VINES:
- dissect_vines(pd, 4, fd, tree);
+
+ 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 PPP_IPV6:
- dissect_ipv6(pd, 4, fd, tree);
+
+ 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:
- dissect_data(pd, 4, fd, tree);
- if (check_col(fd, COL_PROTOCOL))
- col_add_fstr(fd, COL_PROTOCOL, "0x%04x", ph.ppp_prot);
+ 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 gboolean
+dissect_ppp_stuff( tvbuff_t *tvb, packet_info *pinfo,
+ proto_tree *tree, proto_tree *fh_tree ) {
+ guint16 ppp_prot;
+ int proto_len;
+ tvbuff_t *next_tvb;
+
+ if (tvb_get_guint8(tvb, 0) & PFC_BIT) {
+ ppp_prot = tvb_get_guint8(tvb, 0);
+ proto_len = 1;
+ } else {
+ ppp_prot = tvb_get_ntohs(tvb, 0);
+ proto_len = 2;
+ }
+
+ if (tree) {
+ proto_tree_add_text(fh_tree, tvb, 0, proto_len, "Protocol: %s (0x%04x)",
+ val_to_str(ppp_prot, ppp_vals, "Unknown"), ppp_prot);
+ }
+
+ next_tvb = tvb_new_subset(tvb, proto_len, -1, -1);
+
+ /* do lookup with the subdissector table */
+ if (dissector_try_port(subdissector_table, ppp_prot, next_tvb, pinfo, tree))
+ return TRUE;
+
+ /* XXX - make "dissect_lcp()" and "dissect_ipcp()", have them just
+ call "dissect_cp()", and register them as well?
+
+ We can do that for "dissect_mp()", too. */
+ switch (ppp_prot) {
+ case PPP_MP:
+ dissect_mp(next_tvb, pinfo, tree);
+ return TRUE;
+ case PPP_LCP:
+ dissect_cp(next_tvb, "L", "Link", ett_lcp, lcp_vals, ett_lcp_options,
+ lcp_opts, N_LCP_OPTS, pinfo, tree);
+ return TRUE;
+ case PPP_IPCP:
+ dissect_cp(next_tvb, "IP", "IP", ett_ipcp, cp_vals, ett_ipcp_options,
+ ipcp_opts, N_IPCP_OPTS, pinfo, tree);
+ return TRUE;
+ default:
+ 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);
+ return FALSE;
+ }
+}
+
+#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
+
+/* 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, *fh_tree = NULL;
+ proto_item *ti;
+ guint8 flags;
+ guint32 seq;
+ gchar *flag_str;
+ int first, last;
+ tvbuff_t *next_tvb;
+
+ CHECK_DISPLAY_AS_DATA(proto_mp, tvb, pinfo, tree);
+
+ flags = tvb_get_guint8(tvb, 0);
+ first = flags && MP_FRAG_FIRST;
+ last = flags && MP_FRAG_LAST;
+ seq = tvb_get_ntoh24(tvb, 1);
+
+ if (check_col(pinfo->fd, COL_INFO))
+ col_add_fstr(pinfo->fd, COL_INFO, "PPP Multilink");
+
+ 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_format(hdr_tree, hf_mp_frag_first, tvb, 0, 1, first,
+ "%s", decode_boolean_bitfield(flags, MP_FRAG_FIRST, sizeof(flags) * 8,
+ "first", "not first"));
+ proto_tree_add_boolean_format(hdr_tree, hf_mp_frag_last, tvb, 0, 1, last,
+ "%s", decode_boolean_bitfield(flags, MP_FRAG_LAST, sizeof(flags) * 8,
+ "last", "not last"));
+ 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_uint(mp_tree, hf_mp_sequence_num, tvb, 1, 3, seq);
+ }
+
+ next_tvb = tvb_new_subset(tvb, 4, -1, -1);
+
+ if (tvb_length(next_tvb) > 0) {
+ if (tree) {
+ ti = proto_tree_add_item(tree, proto_ppp, next_tvb, 0, 1, FALSE);
+ fh_tree = proto_item_add_subtree(ti, ett_ppp);
+ }
+ dissect_ppp_stuff(next_tvb, pinfo, tree, fh_tree);
+ }
+}
+
+static void
+dissect_payload_ppp( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree ) {
+ proto_item *ti;
+ proto_tree *fh_tree = NULL;
+
+ /* XXX - the length shouldn't be 2, it should be based on the length
+ of the protocol field. */
+ if(tree) {
+ ti = proto_tree_add_item(tree, proto_ppp, tvb, 0, 2, FALSE);
+ fh_tree = proto_item_add_subtree(ti, ett_ppp);
+ }
+
+ dissect_ppp_stuff(tvb, pinfo, tree, fh_tree);
+}
+
+static void
+dissect_ppp( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree ) {
+ e_ppphdr ph;
+ proto_item *ti;
+ proto_tree *fh_tree = NULL;
+ int proto_offset;
+ tvbuff_t *next_tvb;
+ guint8 byte0;
+ guint32 rx_fcs_exp;
+ guint32 rx_fcs_got;
+
+ CHECK_DISPLAY_AS_DATA(proto_ppp, tvb, pinfo, tree);
+
+ pinfo->current_proto = "PPP";
+ byte0 = tvb_get_guint8(tvb, 0);
+
+ if (byte0 == 0xff) {
+ ph.ppp_addr = tvb_get_guint8(tvb, 0);
+ ph.ppp_ctl = tvb_get_guint8(tvb, 1);
+ ph.ppp_prot = tvb_get_ntohs(tvb, 2);
+ proto_offset = 2;
+ }
+ /* Cisco HDLC format */
+ else if (byte0 == 0x0f) {
+ ph.ppp_addr = tvb_get_guint8(tvb, 0);
+ ph.ppp_ctl = tvb_get_guint8(tvb, 1);
+ ph.ppp_prot = tvb_get_ntohs(tvb, 2);
+ proto_offset = 2;
+ }
+ else {
+ /* address and control are compressed (NULL) */
+ ph.ppp_prot = tvb_get_ntohs(tvb, 0);
+ 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, 4, FALSE);
+ fh_tree = proto_item_add_subtree(ti, ett_ppp);
+ if (byte0 == 0xff) {
+ proto_tree_add_text(fh_tree, tvb, 0, 1, "Address: %02x", ph.ppp_addr);
+ proto_tree_add_text(fh_tree, tvb, 1, 1, "Control: %02x", ph.ppp_ctl);
+ }
+ else if (byte0 == 0x0f) {
+ proto_tree_add_text(fh_tree, tvb, 0, 1, "Address: %02x", ph.ppp_addr);
+ proto_tree_add_text(fh_tree, tvb, 1, 1, "Control: %02x", ph.ppp_ctl);
+ }
+ }
+
+ next_tvb = tvb_new_subset(tvb, proto_offset, -1, -1);
+
+ if (!dissect_ppp_stuff(next_tvb, pinfo, tree, fh_tree)) {
+ if (check_col(pinfo->fd, COL_PROTOCOL))
+ col_add_fstr(pinfo->fd, COL_PROTOCOL, "0x%04x", ph.ppp_prot);
+ }
+
+ /* Calculate the FCS check */
+ if (ppp_fcs_decode == FCS_16) {
+ rx_fcs_got = 0;
+ rx_fcs_exp = fcs16(0xFFFF, tvb, 0, tvb_length(tvb) - 2);
+ rx_fcs_got = tvb_get_guint8(tvb, tvb_length(tvb) - 2) |
+ (tvb_get_guint8(tvb, tvb_length(tvb) - 1) << 8);
+ if (rx_fcs_got != rx_fcs_exp) {
+ proto_tree_add_text(fh_tree, tvb, tvb_length(tvb) - 2, 2, "FCS 16: %04x (incorrect, should be %04x)", rx_fcs_got, rx_fcs_exp);
+ }
+ else {
+ proto_tree_add_text(fh_tree, tvb, tvb_length(tvb) - 2, 2, "FCS 16: %04x (correct)", rx_fcs_got);
+ }
+ }
+ else if(ppp_fcs_decode == FCS_32) {
+ rx_fcs_got = 0;
+ rx_fcs_exp = fcs32(0xFFFFFFFF, tvb, 0, tvb_length(tvb) - 4);
+ rx_fcs_got = tvb_get_guint8(tvb, tvb_length(tvb) - 4) |
+ (tvb_get_guint8(tvb, tvb_length(tvb) - 3) << 8) |
+ (tvb_get_guint8(tvb, tvb_length(tvb) - 2) << 16) |
+ (tvb_get_guint8(tvb, tvb_length(tvb) - 1) << 24);
+ if (rx_fcs_got != rx_fcs_exp) {
+ proto_tree_add_text(fh_tree, tvb, tvb_length(tvb) - 4, 4, "FCS 32: %08x (incorrect, should be %08x) ", rx_fcs_got, rx_fcs_exp);
+ }
+ else {
+ proto_tree_add_text(fh_tree, tvb, tvb_length(tvb) - 4, 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,
+ &ett_ipcp,
+ &ett_ipcp_options,
+ &ett_ipcp_ipaddrs_opt,
+ &ett_ipcp_compressprot_opt,
+ &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,
+ };
+
+ 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", dissect_ppp);
+ register_dissector("payload_ppp", dissect_payload_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_register_mp(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_mp_frag_first,
+ { "First fragment", "mp.first", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+ "" }},
+
+ { &hf_mp_frag_last,
+ { "Last fragment", "mp.last", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+ "" }},
+
+ { &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_ppp(void)
+{
+ dissector_add("wtap_encap", WTAP_ENCAP_PPP, dissect_ppp);
+ dissector_add("wtap_encap", WTAP_ENCAP_PPP_WITH_PHDR, dissect_ppp);
+}
git.samba.org / obnox / wireshark / wip.git / blobdiff