675 lines
23 KiB
C
675 lines
23 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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* and Steinar Haug (sthaug@nethelp.no)
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*/
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#define NETDISSECT_REWORKED
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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 "interface.h"
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#include "extract.h"
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#include "addrtoname.h"
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#include "l2vpn.h"
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#include "af.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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uint8_t version[2];
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uint8_t pdu_length[2];
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uint8_t lsr_id[4];
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uint8_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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uint8_t type[2];
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uint8_t length[2];
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uint8_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 Withdraw" },
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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_ADDRESS_LIST_AFNUM_LEN 2
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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_FT_SESSION 0x0503
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#define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
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#define LDP_TLV_MTU 0x0601 /* rfc 3988 */
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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_FT_SESSION, "Fault-Tolerant Session Parameters" },
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{ LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
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{ LDP_TLV_MTU, "MTU" },
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{ 0, NULL}
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};
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#define LDP_FEC_WILDCARD 0x01
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#define LDP_FEC_PREFIX 0x02
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#define LDP_FEC_HOSTADDRESS 0x03
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/* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
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#define LDP_FEC_MARTINI_VC 0x80
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static const struct tok ldp_fec_values[] = {
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{ LDP_FEC_WILDCARD, "Wildcard" },
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{ LDP_FEC_PREFIX, "Prefix" },
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{ LDP_FEC_HOSTADDRESS, "Host address" },
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{ LDP_FEC_MARTINI_VC, "Martini VC" },
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{ 0, NULL}
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};
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#define LDP_FEC_MARTINI_IFPARM_MTU 0x01
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#define LDP_FEC_MARTINI_IFPARM_DESC 0x03
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#define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
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static const struct tok ldp_fec_martini_ifparm_values[] = {
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{ LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
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{ LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
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{ LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
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{ 0, NULL}
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};
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/* draft-ietf-pwe3-vccv-04.txt */
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static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
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{ 0x01, "PWE3 control word" },
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{ 0x02, "MPLS Router Alert Label" },
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{ 0x04, "MPLS inner label TTL = 1" },
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{ 0, NULL}
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};
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/* draft-ietf-pwe3-vccv-04.txt */
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static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
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{ 0x01, "ICMP Ping" },
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{ 0x02, "LSP Ping" },
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{ 0x04, "BFD" },
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{ 0, NULL}
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};
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static int ldp_msg_print(netdissect_options *, 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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#define TLV_TCHECK(minlen) \
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ND_TCHECK2(*tptr, minlen); if (tlv_tlen < minlen) goto badtlv;
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static int
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ldp_tlv_print(netdissect_options *ndo,
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register const u_char *tptr) {
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struct ldp_tlv_header {
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uint8_t type[2];
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uint8_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,af,ft_flags;
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u_char fec_type;
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u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
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char buf[100];
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int i;
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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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ND_PRINT((ndo, "\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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TLV_TCHECK(4);
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ND_PRINT((ndo, "\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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TLV_TCHECK(4);
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ND_PRINT((ndo, "\n\t IPv4 Transport Address: %s", ipaddr_string(ndo, 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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TLV_TCHECK(16);
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ND_PRINT((ndo, "\n\t IPv6 Transport Address: %s", ip6addr_string(ndo, 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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TLV_TCHECK(4);
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ND_PRINT((ndo, "\n\t Sequence Number: %u", EXTRACT_32BITS(tptr)));
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break;
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case LDP_TLV_ADDRESS_LIST:
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TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
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af = EXTRACT_16BITS(tptr);
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tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
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tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
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ND_PRINT((ndo, "\n\t Address Family: %s, addresses",
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tok2str(af_values, "Unknown (%u)", af)));
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switch (af) {
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case AFNUM_INET:
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while(tlv_tlen >= sizeof(struct in_addr)) {
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ND_TCHECK2(*tptr, sizeof(struct in_addr));
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ND_PRINT((ndo, " %s", ipaddr_string(ndo, tptr)));
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tlv_tlen-=sizeof(struct in_addr);
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tptr+=sizeof(struct in_addr);
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}
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break;
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#ifdef INET6
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case AFNUM_INET6:
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while(tlv_tlen >= sizeof(struct in6_addr)) {
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ND_TCHECK2(*tptr, sizeof(struct in6_addr));
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ND_PRINT((ndo, " %s", ip6addr_string(ndo, tptr)));
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tlv_tlen-=sizeof(struct in6_addr);
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tptr+=sizeof(struct in6_addr);
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}
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break;
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#endif
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default:
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/* unknown AF */
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break;
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}
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break;
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case LDP_TLV_COMMON_SESSION:
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TLV_TCHECK(8);
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ND_PRINT((ndo, "\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
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EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
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(EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
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(EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
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));
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break;
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case LDP_TLV_FEC:
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TLV_TCHECK(1);
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fec_type = *tptr;
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ND_PRINT((ndo, "\n\t %s FEC (0x%02x)",
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tok2str(ldp_fec_values, "Unknown", fec_type),
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fec_type));
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tptr+=1;
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tlv_tlen-=1;
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switch(fec_type) {
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case LDP_FEC_WILDCARD:
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break;
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case LDP_FEC_PREFIX:
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TLV_TCHECK(2);
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af = EXTRACT_16BITS(tptr);
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tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
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tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
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if (af == AFNUM_INET) {
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i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
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if (i == -2)
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goto trunc;
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if (i == -3)
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ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
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else if (i == -1)
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ND_PRINT((ndo, ": IPv4 prefix (invalid length)"));
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else
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ND_PRINT((ndo, ": IPv4 prefix %s", buf));
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}
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#ifdef INET6
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else if (af == AFNUM_INET6) {
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i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
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if (i == -2)
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goto trunc;
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if (i == -3)
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ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
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else if (i == -1)
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ND_PRINT((ndo, ": IPv6 prefix (invalid length)"));
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else
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ND_PRINT((ndo, ": IPv6 prefix %s", buf));
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}
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#endif
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else
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ND_PRINT((ndo, ": Address family %u prefix", af));
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break;
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case LDP_FEC_HOSTADDRESS:
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break;
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case LDP_FEC_MARTINI_VC:
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/*
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* According to RFC 4908, the VC info Length field can be zero,
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* in which case not only are there no interface parameters,
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* there's no VC ID.
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*/
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TLV_TCHECK(7);
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vc_info_len = *(tptr+2);
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if (vc_info_len == 0) {
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ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-info-length: %u",
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tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
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EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
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EXTRACT_32BITS(tptr+3),
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vc_info_len));
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break;
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}
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/* Make sure we have the VC ID as well */
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TLV_TCHECK(11);
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ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
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tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
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EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
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EXTRACT_32BITS(tptr+3),
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EXTRACT_32BITS(tptr+7),
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vc_info_len));
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if (vc_info_len < 4)
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goto trunc; /* minimum 4, for the VC ID */
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vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
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/* Skip past the fixed information and the VC ID */
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tptr+=11;
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tlv_tlen-=11;
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TLV_TCHECK(vc_info_len);
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while (vc_info_len > 2) {
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vc_info_tlv_type = *tptr;
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vc_info_tlv_len = *(tptr+1);
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if (vc_info_tlv_len < 2)
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break;
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if (vc_info_len < vc_info_tlv_len)
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break;
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ND_PRINT((ndo, "\n\t\tInterface Parameter: %s (0x%02x), len %u",
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tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
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vc_info_tlv_type,
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vc_info_tlv_len));
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switch(vc_info_tlv_type) {
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case LDP_FEC_MARTINI_IFPARM_MTU:
|
|
ND_PRINT((ndo, ": %u", EXTRACT_16BITS(tptr+2)));
|
|
break;
|
|
|
|
case LDP_FEC_MARTINI_IFPARM_DESC:
|
|
ND_PRINT((ndo, ": "));
|
|
for (idx = 2; idx < vc_info_tlv_len; idx++)
|
|
safeputchar(ndo, *(tptr + idx));
|
|
break;
|
|
|
|
case LDP_FEC_MARTINI_IFPARM_VCCV:
|
|
ND_PRINT((ndo, "\n\t\t Control Channels (0x%02x) = [%s]",
|
|
*(tptr+2),
|
|
bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", *(tptr+2))));
|
|
ND_PRINT((ndo, "\n\t\t CV Types (0x%02x) = [%s]",
|
|
*(tptr+3),
|
|
bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", *(tptr+3))));
|
|
break;
|
|
|
|
default:
|
|
print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2);
|
|
break;
|
|
}
|
|
|
|
vc_info_len -= vc_info_tlv_len;
|
|
tptr += vc_info_tlv_len;
|
|
}
|
|
break;
|
|
}
|
|
|
|
break;
|
|
|
|
case LDP_TLV_GENERIC_LABEL:
|
|
TLV_TCHECK(4);
|
|
ND_PRINT((ndo, "\n\t Label: %u", EXTRACT_32BITS(tptr) & 0xfffff));
|
|
break;
|
|
|
|
case LDP_TLV_STATUS:
|
|
TLV_TCHECK(8);
|
|
ui = EXTRACT_32BITS(tptr);
|
|
tptr+=4;
|
|
ND_PRINT((ndo, "\n\t Status: 0x%02x, Flags: [%s and %s forward]",
|
|
ui&0x3fffffff,
|
|
ui&0x80000000 ? "Fatal error" : "Advisory Notification",
|
|
ui&0x40000000 ? "do" : "don't"));
|
|
ui = EXTRACT_32BITS(tptr);
|
|
tptr+=4;
|
|
if (ui)
|
|
ND_PRINT((ndo, ", causing Message ID: 0x%08x", ui));
|
|
break;
|
|
|
|
case LDP_TLV_FT_SESSION:
|
|
TLV_TCHECK(8);
|
|
ft_flags = EXTRACT_16BITS(tptr);
|
|
ND_PRINT((ndo, "\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
|
|
ft_flags&0x8000 ? "" : "No ",
|
|
ft_flags&0x8 ? "" : "Don't ",
|
|
ft_flags&0x4 ? "" : "No ",
|
|
ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
|
|
ft_flags&0x1 ? "" : "Don't "));
|
|
tptr+=4;
|
|
ui = EXTRACT_32BITS(tptr);
|
|
if (ui)
|
|
ND_PRINT((ndo, ", Reconnect Timeout: %ums", ui));
|
|
tptr+=4;
|
|
ui = EXTRACT_32BITS(tptr);
|
|
if (ui)
|
|
ND_PRINT((ndo, ", Recovery Time: %ums", ui));
|
|
break;
|
|
|
|
case LDP_TLV_MTU:
|
|
TLV_TCHECK(2);
|
|
ND_PRINT((ndo, "\n\t MTU: %u", EXTRACT_16BITS(tptr)));
|
|
break;
|
|
|
|
|
|
/*
|
|
* FIXME those are the defined TLVs that lack a decoder
|
|
* you are welcome to contribute code ;-)
|
|
*/
|
|
|
|
case LDP_TLV_HOP_COUNT:
|
|
case LDP_TLV_PATH_VECTOR:
|
|
case LDP_TLV_ATM_LABEL:
|
|
case LDP_TLV_FR_LABEL:
|
|
case LDP_TLV_EXTD_STATUS:
|
|
case LDP_TLV_RETURNED_PDU:
|
|
case LDP_TLV_RETURNED_MSG:
|
|
case LDP_TLV_ATM_SESSION_PARM:
|
|
case LDP_TLV_FR_SESSION_PARM:
|
|
case LDP_TLV_LABEL_REQUEST_MSG_ID:
|
|
|
|
default:
|
|
if (ndo->ndo_vflag <= 1)
|
|
print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen);
|
|
break;
|
|
}
|
|
return(tlv_len+4); /* Type & Length fields not included */
|
|
|
|
trunc:
|
|
ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
|
|
return 0;
|
|
|
|
badtlv:
|
|
ND_PRINT((ndo, "\n\t\t TLV contents go past end of TLV"));
|
|
return(tlv_len+4); /* Type & Length fields not included */
|
|
}
|
|
|
|
void
|
|
ldp_print(netdissect_options *ndo,
|
|
register const u_char *pptr, register u_int len) {
|
|
|
|
int processed;
|
|
while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
|
|
processed = ldp_msg_print(ndo, pptr);
|
|
if (processed == 0)
|
|
return;
|
|
len -= processed;
|
|
pptr += processed;
|
|
}
|
|
}
|
|
|
|
static int
|
|
ldp_msg_print(netdissect_options *ndo,
|
|
register const u_char *pptr) {
|
|
|
|
const struct ldp_common_header *ldp_com_header;
|
|
const struct ldp_msg_header *ldp_msg_header;
|
|
const u_char *tptr,*msg_tptr;
|
|
u_short tlen;
|
|
u_short pdu_len,msg_len,msg_type,msg_tlen;
|
|
int hexdump,processed;
|
|
|
|
tptr=pptr;
|
|
ldp_com_header = (const struct ldp_common_header *)pptr;
|
|
ND_TCHECK(*ldp_com_header);
|
|
|
|
/*
|
|
* Sanity checking of the header.
|
|
*/
|
|
if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
|
|
ND_PRINT((ndo, "%sLDP version %u packet not supported",
|
|
(ndo->ndo_vflag < 1) ? "" : "\n\t",
|
|
EXTRACT_16BITS(&ldp_com_header->version)));
|
|
return 0;
|
|
}
|
|
|
|
/* print the LSR-ID, label-space & length */
|
|
pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
|
|
ND_PRINT((ndo, "%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
|
|
(ndo->ndo_vflag < 1) ? "" : "\n\t",
|
|
ipaddr_string(ndo, &ldp_com_header->lsr_id),
|
|
EXTRACT_16BITS(&ldp_com_header->label_space),
|
|
pdu_len));
|
|
|
|
/* bail out if non-verbose */
|
|
if (ndo->ndo_vflag < 1)
|
|
return 0;
|
|
|
|
/* ok they seem to want to know everything - lets fully decode it */
|
|
tlen=pdu_len;
|
|
|
|
tptr += sizeof(const struct ldp_common_header);
|
|
tlen -= sizeof(const struct ldp_common_header)-4; /* Type & Length fields not included */
|
|
|
|
while(tlen>0) {
|
|
/* did we capture enough for fully decoding the msg header ? */
|
|
ND_TCHECK2(*tptr, sizeof(struct ldp_msg_header));
|
|
|
|
ldp_msg_header = (const struct ldp_msg_header *)tptr;
|
|
msg_len=EXTRACT_16BITS(ldp_msg_header->length);
|
|
msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
|
|
|
|
/* FIXME vendor private / experimental check */
|
|
ND_PRINT((ndo, "\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
|
|
tok2str(ldp_msg_values,
|
|
"Unknown",
|
|
msg_type),
|
|
msg_type,
|
|
msg_len,
|
|
EXTRACT_32BITS(&ldp_msg_header->id),
|
|
LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore"));
|
|
|
|
if (msg_len == 0) /* infinite loop protection */
|
|
return 0;
|
|
|
|
msg_tptr=tptr+sizeof(struct ldp_msg_header);
|
|
msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
|
|
|
|
/* did we capture enough for fully decoding the message ? */
|
|
ND_TCHECK2(*tptr, msg_len);
|
|
hexdump=FALSE;
|
|
|
|
switch(msg_type) {
|
|
|
|
case LDP_MSG_NOTIF:
|
|
case LDP_MSG_HELLO:
|
|
case LDP_MSG_INIT:
|
|
case LDP_MSG_KEEPALIVE:
|
|
case LDP_MSG_ADDRESS:
|
|
case LDP_MSG_LABEL_MAPPING:
|
|
case LDP_MSG_ADDRESS_WITHDRAW:
|
|
case LDP_MSG_LABEL_WITHDRAW:
|
|
while(msg_tlen >= 4) {
|
|
processed = ldp_tlv_print(ndo, msg_tptr);
|
|
if (processed == 0)
|
|
break;
|
|
msg_tlen-=processed;
|
|
msg_tptr+=processed;
|
|
}
|
|
break;
|
|
|
|
/*
|
|
* FIXME those are the defined messages that lack a decoder
|
|
* you are welcome to contribute code ;-)
|
|
*/
|
|
|
|
case LDP_MSG_LABEL_REQUEST:
|
|
case LDP_MSG_LABEL_RELEASE:
|
|
case LDP_MSG_LABEL_ABORT_REQUEST:
|
|
|
|
default:
|
|
if (ndo->ndo_vflag <= 1)
|
|
print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
|
|
break;
|
|
}
|
|
/* do we want to see an additionally hexdump ? */
|
|
if (ndo->ndo_vflag > 1 || hexdump==TRUE)
|
|
print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
|
|
msg_len);
|
|
|
|
tptr += msg_len+4;
|
|
tlen -= msg_len+4;
|
|
}
|
|
return pdu_len+4;
|
|
trunc:
|
|
ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Local Variables:
|
|
* c-style: whitesmith
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|