383 lines
13 KiB
C
383 lines
13 KiB
C
/*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code
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* distributions retain the above copyright notice and this paragraph
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* in its entirety, and (2) distributions including binary code include
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* the above copyright notice and this paragraph in its entirety in
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* the documentation or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
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* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*
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* Original code by Hannes Gredler (hannes@juniper.net)
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-ldp.c,v 1.4.2.2 2003/11/16 08:51:31 guy Exp $";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "interface.h"
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#include "extract.h"
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#include "addrtoname.h"
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/*
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* ldp common header
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Version | PDU Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | LDP Identifier |
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* + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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*/
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struct ldp_common_header {
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u_int8_t version[2];
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u_int8_t pdu_length[2];
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u_int8_t lsr_id[4];
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u_int8_t label_space[2];
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};
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#define LDP_VERSION 1
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/*
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* ldp message header
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |U| Message Type | Message Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Message ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* + +
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* | Mandatory Parameters |
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* + +
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* + +
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* | Optional Parameters |
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* + +
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct ldp_msg_header {
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u_int8_t type[2];
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u_int8_t length[2];
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u_int8_t id[4];
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};
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#define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff)
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#define LDP_MASK_U_BIT(x) ((x)&0x8000)
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#define LDP_MSG_NOTIF 0x0001
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#define LDP_MSG_HELLO 0x0100
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#define LDP_MSG_INIT 0x0200
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#define LDP_MSG_KEEPALIVE 0x0201
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#define LDP_MSG_ADDRESS 0x0300
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#define LDP_MSG_ADDRESS_WITHDRAW 0x0301
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#define LDP_MSG_LABEL_MAPPING 0x0400
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#define LDP_MSG_LABEL_REQUEST 0x0401
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#define LDP_MSG_LABEL_WITHDRAW 0x0402
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#define LDP_MSG_LABEL_RELEASE 0x0403
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#define LDP_MSG_LABEL_ABORT_REQUEST 0x0404
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#define LDP_VENDOR_PRIVATE_MIN 0x3e00
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#define LDP_VENDOR_PRIVATE_MAX 0x3eff
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#define LDP_EXPERIMENTAL_MIN 0x3f00
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#define LDP_EXPERIMENTAL_MAX 0x3fff
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static const struct tok ldp_msg_values[] = {
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{ LDP_MSG_NOTIF, "Notification" },
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{ LDP_MSG_HELLO, "Hello" },
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{ LDP_MSG_INIT, "Initialization" },
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{ LDP_MSG_KEEPALIVE, "Keepalive" },
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{ LDP_MSG_ADDRESS, "Address" },
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{ LDP_MSG_ADDRESS_WITHDRAW, "Address Widthdraw" },
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{ LDP_MSG_LABEL_MAPPING, "Label Mapping" },
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{ LDP_MSG_LABEL_REQUEST, "Label Request" },
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{ LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" },
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{ LDP_MSG_LABEL_RELEASE, "Label Release" },
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{ LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" },
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{ 0, NULL}
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};
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#define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
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#define LDP_MASK_F_BIT(x) ((x)&0x4000)
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#define LDP_TLV_FEC 0x0100
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#define LDP_TLV_ADDRESS_LIST 0x0101
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#define LDP_TLV_HOP_COUNT 0x0103
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#define LDP_TLV_PATH_VECTOR 0x0104
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#define LDP_TLV_GENERIC_LABEL 0x0200
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#define LDP_TLV_ATM_LABEL 0x0201
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#define LDP_TLV_FR_LABEL 0x0202
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#define LDP_TLV_STATUS 0x0300
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#define LDP_TLV_EXTD_STATUS 0x0301
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#define LDP_TLV_RETURNED_PDU 0x0302
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#define LDP_TLV_RETURNED_MSG 0x0303
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#define LDP_TLV_COMMON_HELLO 0x0400
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#define LDP_TLV_IPV4_TRANSPORT_ADDR 0x0401
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#define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402
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#define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403
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#define LDP_TLV_COMMON_SESSION 0x0500
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#define LDP_TLV_ATM_SESSION_PARM 0x0501
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#define LDP_TLV_FR_SESSION_PARM 0x0502
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#define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
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static const struct tok ldp_tlv_values[] = {
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{ LDP_TLV_FEC, "FEC" },
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{ LDP_TLV_ADDRESS_LIST, "Address List" },
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{ LDP_TLV_HOP_COUNT, "Hop Count" },
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{ LDP_TLV_PATH_VECTOR, "Path Vector" },
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{ LDP_TLV_GENERIC_LABEL, "Generic Label" },
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{ LDP_TLV_ATM_LABEL, "ATM Label" },
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{ LDP_TLV_FR_LABEL, "Frame-Relay Label" },
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{ LDP_TLV_STATUS, "Status" },
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{ LDP_TLV_EXTD_STATUS, "Extended Status" },
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{ LDP_TLV_RETURNED_PDU, "Returned PDU" },
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{ LDP_TLV_RETURNED_MSG, "Returned Message" },
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{ LDP_TLV_COMMON_HELLO, "Common Hello Parameters" },
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{ LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" },
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{ LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" },
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{ LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" },
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{ LDP_TLV_COMMON_SESSION, "Common Session Parameters" },
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{ LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" },
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{ LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
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{ LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
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{ 0, NULL}
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};
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#define FALSE 0
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#define TRUE 1
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int ldp_tlv_print(register const u_char *);
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/*
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* ldp tlv header
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |U|F| Type | Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | Value |
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* ~ ~
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* | |
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* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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int
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ldp_tlv_print(register const u_char *tptr) {
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struct ldp_tlv_header {
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u_int8_t type[2];
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u_int8_t length[2];
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};
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const struct ldp_tlv_header *ldp_tlv_header;
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u_short tlv_type,tlv_len,tlv_tlen;
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ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
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tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
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tlv_tlen=tlv_len;
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tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
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/* FIXME vendor private / experimental check */
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printf("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
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tok2str(ldp_tlv_values,
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"Unknown",
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tlv_type),
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tlv_type,
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tlv_len,
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LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
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LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't");
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tptr+=sizeof(struct ldp_tlv_header);
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switch(tlv_type) {
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case LDP_TLV_COMMON_HELLO:
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printf("\n\t Hold Time: %us, Flags: [%s Hello%s]",
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EXTRACT_16BITS(tptr),
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(EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
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(EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : "");
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break;
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case LDP_TLV_IPV4_TRANSPORT_ADDR:
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printf("\n\t IPv4 Transport Address: %s", ipaddr_string(tptr));
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break;
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#ifdef INET6
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case LDP_TLV_IPV6_TRANSPORT_ADDR:
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printf("\n\t IPv6 Transport Address: %s", ip6addr_string(tptr));
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break;
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#endif
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case LDP_TLV_CONFIG_SEQ_NUMBER:
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printf("\n\t Sequence Number: %u", EXTRACT_32BITS(tptr));
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break;
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/*
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* FIXME those are the defined TLVs that lack a decoder
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* you are welcome to contribute code ;-)
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*/
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case LDP_TLV_FEC:
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case LDP_TLV_ADDRESS_LIST:
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case LDP_TLV_HOP_COUNT:
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case LDP_TLV_PATH_VECTOR:
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case LDP_TLV_GENERIC_LABEL:
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case LDP_TLV_ATM_LABEL:
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case LDP_TLV_FR_LABEL:
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case LDP_TLV_STATUS:
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case LDP_TLV_EXTD_STATUS:
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case LDP_TLV_RETURNED_PDU:
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case LDP_TLV_RETURNED_MSG:
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case LDP_TLV_COMMON_SESSION:
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case LDP_TLV_ATM_SESSION_PARM:
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case LDP_TLV_FR_SESSION_PARM:
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case LDP_TLV_LABEL_REQUEST_MSG_ID:
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default:
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if (vflag <= 1)
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print_unknown_data(tptr,"\n\t ",tlv_tlen);
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break;
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}
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return(tlv_len+4); /* Type & Length fields not included */
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}
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void
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ldp_print(register const u_char *pptr, register u_int len) {
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const struct ldp_common_header *ldp_com_header;
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const struct ldp_msg_header *ldp_msg_header;
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const u_char *tptr,*msg_tptr;
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u_short tlen;
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u_short msg_len,msg_type,msg_tlen;
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int hexdump,processed;
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tptr=pptr;
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ldp_com_header = (const struct ldp_common_header *)pptr;
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TCHECK(*ldp_com_header);
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/*
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* Sanity checking of the header.
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*/
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if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
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printf("LDP version %u packet not supported",
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EXTRACT_16BITS(&ldp_com_header->version));
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return;
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}
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/* print the LSR-ID, label-space & length */
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printf("%sLDP, Label-Space-ID: %s:%u, length: %u",
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(vflag < 1) ? "" : "\n\t",
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ipaddr_string(&ldp_com_header->lsr_id),
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EXTRACT_16BITS(&ldp_com_header->label_space),
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len);
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/* bail out if non-verbose */
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if (vflag < 1)
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return;
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/* ok they seem to want to know everything - lets fully decode it */
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tlen=EXTRACT_16BITS(ldp_com_header->pdu_length);
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tptr+=sizeof(const struct ldp_common_header);
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tlen-=sizeof(const struct ldp_common_header);
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while(tlen>0) {
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/* did we capture enough for fully decoding the msg header ? */
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if (!TTEST2(*tptr, sizeof(struct ldp_msg_header)))
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goto trunc;
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ldp_msg_header = (const struct ldp_msg_header *)tptr;
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msg_len=EXTRACT_16BITS(ldp_msg_header->length);
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msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
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/* FIXME vendor private / experimental check */
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printf("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
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tok2str(ldp_msg_values,
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"Unknown",
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msg_type),
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msg_type,
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msg_len,
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EXTRACT_32BITS(&ldp_msg_header->id),
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LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore");
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msg_tptr=tptr+sizeof(struct ldp_msg_header);
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msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
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/* did we capture enough for fully decoding the message ? */
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if (!TTEST2(*tptr, msg_len))
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goto trunc;
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hexdump=FALSE;
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switch(msg_type) {
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case LDP_MSG_HELLO:
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while(msg_tlen >= 4) {
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processed = ldp_tlv_print(msg_tptr);
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if (processed == 0)
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break;
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msg_tlen-=processed;
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msg_tptr+=processed;
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}
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break;
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/*
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* FIXME those are the defined messages that lack a decoder
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* you are welcome to contribute code ;-)
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*/
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case LDP_MSG_NOTIF:
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case LDP_MSG_INIT:
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case LDP_MSG_KEEPALIVE:
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case LDP_MSG_ADDRESS:
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case LDP_MSG_ADDRESS_WITHDRAW:
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case LDP_MSG_LABEL_MAPPING:
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case LDP_MSG_LABEL_REQUEST:
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case LDP_MSG_LABEL_WITHDRAW:
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case LDP_MSG_LABEL_RELEASE:
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case LDP_MSG_LABEL_ABORT_REQUEST:
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default:
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if (vflag <= 1)
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print_unknown_data(msg_tptr,"\n\t ",msg_tlen);
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break;
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}
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/* do we want to see an additionally hexdump ? */
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if (vflag > 1 || hexdump==TRUE)
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print_unknown_data(tptr+sizeof(sizeof(struct ldp_msg_header)),"\n\t ",
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msg_len);
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tptr+=msg_len;
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tlen-=msg_len;
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}
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return;
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trunc:
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printf("\n\t\t packet exceeded snapshot");
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}
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