642 lines
19 KiB
C
642 lines
19 KiB
C
/*
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* Copyright (c) 1998-2006 The TCPDUMP project
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*
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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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* Support for the IEEE Connectivity Fault Management Protocols as per 802.1ag.
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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-cfm.c,v 1.5 2007-07-24 16:01:42 hannes 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 "ether.h"
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#include "addrtoname.h"
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#include "oui.h"
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#include "af.h"
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/*
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* Prototypes
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*/
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const char * cfm_egress_id_string(register const u_char *);
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int cfm_mgmt_addr_print(register const u_char *);
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struct cfm_common_header_t {
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u_int8_t mdlevel_version;
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u_int8_t opcode;
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u_int8_t flags;
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u_int8_t first_tlv_offset;
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};
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#define CFM_VERSION 0
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#define CFM_EXTRACT_VERSION(x) (((x)&0x1f))
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#define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5)
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#define CFM_OPCODE_CCM 1
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#define CFM_OPCODE_LBR 2
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#define CFM_OPCODE_LBM 3
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#define CFM_OPCODE_LTR 4
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#define CFM_OPCODE_LTM 5
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static const struct tok cfm_opcode_values[] = {
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{ CFM_OPCODE_CCM, "Continouity Check Message"},
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{ CFM_OPCODE_LBR, "Loopback Reply"},
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{ CFM_OPCODE_LBM, "Loopback Message"},
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{ CFM_OPCODE_LTR, "Linktrace Reply"},
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{ CFM_OPCODE_LTM, "Linktrace Message"},
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{ 0, NULL}
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};
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/*
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* Message Formats.
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*/
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struct cfm_ccm_t {
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u_int8_t sequence[4];
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u_int8_t ma_epi[2];
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u_int8_t md_nameformat;
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u_int8_t md_namelength;
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u_int8_t md_name[46]; /* md name and short ma name */
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u_int8_t reserved_itu[16];
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u_int8_t reserved[6];
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};
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/*
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* Timer Bases for the CCM Interval field.
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* Expressed in units of seconds.
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*/
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const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600};
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#define CCM_INTERVAL_MIN_MULTIPLIER 3.25
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#define CCM_INTERVAL_MAX_MULTIPLIER 3.5
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#define CFM_CCM_RDI_FLAG 0x80
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#define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07))
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#define CFM_CCM_MD_FORMAT_8021 0
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#define CFM_CCM_MD_FORMAT_NONE 1
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#define CFM_CCM_MD_FORMAT_DNS 2
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#define CFM_CCM_MD_FORMAT_MAC 3
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#define CFM_CCM_MD_FORMAT_CHAR 4
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static const struct tok cfm_md_nameformat_values[] = {
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{ CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"},
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{ CFM_CCM_MD_FORMAT_NONE, "No MD Name present"},
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{ CFM_CCM_MD_FORMAT_DNS, "DNS string"},
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{ CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"},
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{ CFM_CCM_MD_FORMAT_CHAR, "Character string"},
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{ 0, NULL}
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};
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#define CFM_CCM_MA_FORMAT_8021 0
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#define CFM_CCM_MA_FORMAT_VID 1
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#define CFM_CCM_MA_FORMAT_CHAR 2
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#define CFM_CCM_MA_FORMAT_INT 3
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#define CFM_CCM_MA_FORMAT_VPN 4
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static const struct tok cfm_ma_nameformat_values[] = {
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{ CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"},
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{ CFM_CCM_MA_FORMAT_VID, "Primary VID"},
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{ CFM_CCM_MA_FORMAT_CHAR, "Character string"},
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{ CFM_CCM_MA_FORMAT_INT, "16Bit Integer"},
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{ CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"},
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{ 0, NULL}
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};
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struct cfm_lbm_t {
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u_int8_t transaction_id[4];
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u_int8_t reserved[4];
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};
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struct cfm_ltm_t {
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u_int8_t transaction_id[4];
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u_int8_t egress_id[8];
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u_int8_t ttl;
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u_int8_t original_mac[ETHER_ADDR_LEN];
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u_int8_t target_mac[ETHER_ADDR_LEN];
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u_int8_t reserved[3];
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};
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static const struct tok cfm_ltm_flag_values[] = {
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{ 0x80, "Use Forwarding-DB only"},
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{ 0, NULL}
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};
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struct cfm_ltr_t {
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u_int8_t transaction_id[4];
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u_int8_t last_egress_id[8];
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u_int8_t next_egress_id[8];
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u_int8_t ttl;
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u_int8_t replay_action;
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u_int8_t reserved[6];
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};
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static const struct tok cfm_ltr_flag_values[] = {
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{ 0x80, "Forwarded"},
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{ 0x40, "Terminal MEP"},
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{ 0, NULL}
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};
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static const struct tok cfm_ltr_replay_action_values[] = {
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{ 1, "Exact Match"},
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{ 2, "Filtering DB"},
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{ 3, "MIP CCM DB"},
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{ 0, NULL}
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};
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#define CFM_TLV_END 0
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#define CFM_TLV_SENDER_ID 1
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#define CFM_TLV_PORT_STATUS 2
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#define CFM_TLV_INTERFACE_STATUS 3
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#define CFM_TLV_DATA 4
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#define CFM_TLV_REPLY_INGRESS 5
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#define CFM_TLV_REPLY_EGRESS 6
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#define CFM_TLV_PRIVATE 31
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static const struct tok cfm_tlv_values[] = {
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{ CFM_TLV_END, "End"},
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{ CFM_TLV_SENDER_ID, "Sender ID"},
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{ CFM_TLV_PORT_STATUS, "Port status"},
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{ CFM_TLV_INTERFACE_STATUS, "Interface status"},
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{ CFM_TLV_DATA, "Data"},
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{ CFM_TLV_REPLY_INGRESS, "Reply Ingress"},
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{ CFM_TLV_REPLY_EGRESS, "Reply Egress"},
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{ CFM_TLV_PRIVATE, "Organization Specific"},
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{ 0, NULL}
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};
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/*
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* TLVs
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*/
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struct cfm_tlv_header_t {
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u_int8_t type;
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u_int8_t length[2];
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};
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/* FIXME define TLV formats */
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static const struct tok cfm_tlv_port_status_values[] = {
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{ 1, "Blocked"},
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{ 2, "Up"},
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{ 0, NULL}
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};
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static const struct tok cfm_tlv_interface_status_values[] = {
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{ 1, "Up"},
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{ 2, "Down"},
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{ 3, "Testing"},
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{ 5, "Dormant"},
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{ 6, "not present"},
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{ 7, "lower Layer down"},
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{ 0, NULL}
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};
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#define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1
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#define CFM_CHASSIS_ID_INTERFACE_ALIAS 2
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#define CFM_CHASSIS_ID_PORT_COMPONENT 3
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#define CFM_CHASSIS_ID_MAC_ADDRESS 4
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#define CFM_CHASSIS_ID_NETWORK_ADDRESS 5
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#define CFM_CHASSIS_ID_INTERFACE_NAME 6
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#define CFM_CHASSIS_ID_LOCAL 7
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static const struct tok cfm_tlv_senderid_chassisid_values[] = {
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{ 0, "Reserved"},
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{ CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"},
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{ CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"},
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{ CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"},
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{ CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"},
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{ CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"},
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{ CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"},
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{ CFM_CHASSIS_ID_LOCAL, "Locally assigned"},
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{ 0, NULL}
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};
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int
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cfm_mgmt_addr_print(register const u_char *tptr) {
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u_int mgmt_addr_type;
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u_int hexdump = FALSE;
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/*
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* Altough AFIs are tpically 2 octects wide,
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* 802.1ab specifies that this field width
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* is only once octet
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*/
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mgmt_addr_type = *tptr;
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printf("\n\t Management Address Type %s (%u)",
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tok2str(af_values, "Unknown", mgmt_addr_type),
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mgmt_addr_type);
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/*
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* Resolve the passed in Address.
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*/
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switch(mgmt_addr_type) {
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case AFNUM_INET:
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printf(", %s", ipaddr_string(tptr + 1));
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break;
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#ifdef INET6
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case AFNUM_INET6:
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printf(", %s", ip6addr_string(tptr + 1));
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break;
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#endif
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default:
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hexdump = TRUE;
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break;
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}
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return hexdump;
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}
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/*
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* The egress-ID string is a 16-Bit string plus a MAC address.
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*/
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const char *
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cfm_egress_id_string(register const u_char *tptr) {
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static char egress_id_buffer[80];
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snprintf(egress_id_buffer, sizeof(egress_id_buffer),
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"MAC %0x4x-%s",
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EXTRACT_16BITS(tptr),
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etheraddr_string(tptr+2));
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return egress_id_buffer;
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}
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void
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cfm_print(register const u_char *pptr, register u_int length) {
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const struct cfm_common_header_t *cfm_common_header;
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const struct cfm_tlv_header_t *cfm_tlv_header;
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const u_int8_t *tptr, *tlv_ptr, *ma_name, *ma_nameformat, *ma_namelength;
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u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval;
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union {
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const struct cfm_ccm_t *cfm_ccm;
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const struct cfm_lbm_t *cfm_lbm;
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const struct cfm_ltm_t *cfm_ltm;
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const struct cfm_ltr_t *cfm_ltr;
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} msg_ptr;
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tptr=pptr;
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cfm_common_header = (const struct cfm_common_header_t *)pptr;
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TCHECK(*cfm_common_header);
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/*
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* Sanity checking of the header.
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*/
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if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) {
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printf("CFMv%u not supported, length %u",
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CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length);
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return;
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}
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printf("CFMv%u %s, MD Level %u, length %u",
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CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version),
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tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode),
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CFM_EXTRACT_MD_LEVEL(cfm_common_header->mdlevel_version),
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length);
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/*
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* In non-verbose mode just print the opcode and md-level.
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*/
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if (vflag < 1) {
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return;
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}
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printf("\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset);
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tptr += sizeof(const struct cfm_common_header_t);
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tlen = length - sizeof(struct cfm_common_header_t);
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switch (cfm_common_header->opcode) {
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case CFM_OPCODE_CCM:
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msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
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ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags);
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printf(", Flags [CCM Interval %u%s]",
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ccm_interval,
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cfm_common_header->flags & CFM_CCM_RDI_FLAG ?
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", RDI" : "");
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/*
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* Resolve the CCM interval field.
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*/
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if (ccm_interval) {
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printf("\n\t CCM Interval %.3fs"
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", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs",
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ccm_interval_base[ccm_interval],
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ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER,
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ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER);
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}
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printf("\n\t Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
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EXTRACT_32BITS(msg_ptr.cfm_ccm->sequence),
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EXTRACT_16BITS(msg_ptr.cfm_ccm->ma_epi));
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/*
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* Resolve the MD fields.
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*/
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printf("\n\t MD Name Format %s (%u), MD Name length %u",
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tok2str(cfm_md_nameformat_values, "Unknown",
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msg_ptr.cfm_ccm->md_nameformat),
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msg_ptr.cfm_ccm->md_nameformat,
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msg_ptr.cfm_ccm->md_namelength);
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if (msg_ptr.cfm_ccm->md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
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printf("\n\t MD Name: ");
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switch (msg_ptr.cfm_ccm->md_nameformat) {
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case CFM_CCM_MD_FORMAT_DNS:
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case CFM_CCM_MD_FORMAT_CHAR:
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safeputs((const char *)msg_ptr.cfm_ccm->md_name, msg_ptr.cfm_ccm->md_namelength);
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break;
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case CFM_CCM_MD_FORMAT_MAC:
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printf("\n\t MAC %s", etheraddr_string(
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msg_ptr.cfm_ccm->md_name));
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break;
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/* FIXME add printers for those MD formats - hexdump for now */
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case CFM_CCM_MA_FORMAT_8021:
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default:
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print_unknown_data(msg_ptr.cfm_ccm->md_name, "\n\t ",
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msg_ptr.cfm_ccm->md_namelength);
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}
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}
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/*
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* Resolve the MA fields.
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*/
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ma_nameformat = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength;
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ma_namelength = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 1;
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ma_name = msg_ptr.cfm_ccm->md_name + msg_ptr.cfm_ccm->md_namelength + 2;
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printf("\n\t MA Name-Format %s (%u), MA name length %u",
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tok2str(cfm_ma_nameformat_values, "Unknown",
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*ma_nameformat),
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*ma_nameformat,
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*ma_namelength);
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printf("\n\t MA Name: ");
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switch (*ma_nameformat) {
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case CFM_CCM_MA_FORMAT_CHAR:
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safeputs((const char *)ma_name, *ma_namelength);
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break;
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/* FIXME add printers for those MA formats - hexdump for now */
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case CFM_CCM_MA_FORMAT_8021:
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case CFM_CCM_MA_FORMAT_VID:
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case CFM_CCM_MA_FORMAT_INT:
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case CFM_CCM_MA_FORMAT_VPN:
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default:
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print_unknown_data(ma_name, "\n\t ", *ma_namelength);
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}
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break;
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case CFM_OPCODE_LTM:
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printf(", Flags [%s]",
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bittok2str(cfm_ltm_flag_values, "none", cfm_common_header->flags));
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printf("\n\t Transaction-ID 0x%08x, Egress-ID %s, ttl %u",
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EXTRACT_32BITS(msg_ptr.cfm_ltm->transaction_id),
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cfm_egress_id_string(msg_ptr.cfm_ltm->egress_id),
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msg_ptr.cfm_ltm->ttl);
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printf("\n\t Original-MAC %s, Target-MAC %s",
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etheraddr_string(msg_ptr.cfm_ltm->original_mac),
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etheraddr_string(msg_ptr.cfm_ltm->target_mac));
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break;
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case CFM_OPCODE_LTR:
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printf(", Flags [%s]",
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bittok2str(cfm_ltr_flag_values, "none", cfm_common_header->flags));
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printf("\n\t Transaction-ID 0x%08x, Last-Egress-ID %s",
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EXTRACT_32BITS(msg_ptr.cfm_ltr->transaction_id),
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cfm_egress_id_string(msg_ptr.cfm_ltr->last_egress_id));
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printf("\n\t Next-Egress-ID %s, ttl %u",
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cfm_egress_id_string(msg_ptr.cfm_ltr->next_egress_id),
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msg_ptr.cfm_ltr->ttl);
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printf("\n\t Replay-Action %s (%u)",
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tok2str(cfm_ltr_replay_action_values,
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"Unknown",
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msg_ptr.cfm_ltr->replay_action),
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msg_ptr.cfm_ltr->replay_action);
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break;
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/*
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* No message decoder yet.
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* Hexdump everything up until the start of the TLVs
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*/
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case CFM_OPCODE_LBR:
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case CFM_OPCODE_LBM:
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default:
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if (tlen > cfm_common_header->first_tlv_offset) {
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print_unknown_data(tptr, "\n\t ",
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tlen - cfm_common_header->first_tlv_offset);
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}
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break;
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}
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|
/*
|
|
* Sanity check for not walking off.
|
|
*/
|
|
if (tlen <= cfm_common_header->first_tlv_offset) {
|
|
return;
|
|
}
|
|
|
|
tptr += cfm_common_header->first_tlv_offset;
|
|
tlen -= cfm_common_header->first_tlv_offset;
|
|
|
|
while (tlen > 0) {
|
|
cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
|
|
|
|
/* Enough to read the tlv type ? */
|
|
TCHECK2(*tptr, 1);
|
|
cfm_tlv_type=cfm_tlv_header->type;
|
|
|
|
if (cfm_tlv_type != CFM_TLV_END) {
|
|
/* did we capture enough for fully decoding the object header ? */
|
|
TCHECK2(*tptr, sizeof(struct cfm_tlv_header_t));
|
|
cfm_tlv_len=EXTRACT_16BITS(&cfm_tlv_header->length);
|
|
} else {
|
|
cfm_tlv_len = 0;
|
|
}
|
|
|
|
printf("\n\t%s TLV (0x%02x), length %u",
|
|
tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
|
|
cfm_tlv_type,
|
|
cfm_tlv_len);
|
|
|
|
/* sanity check for not walking off and infinite loop check. */
|
|
if ((cfm_tlv_type != CFM_TLV_END) &&
|
|
((cfm_tlv_len + sizeof(struct cfm_tlv_header_t) > tlen) ||
|
|
(!cfm_tlv_len))) {
|
|
print_unknown_data(tptr,"\n\t ",tlen);
|
|
return;
|
|
}
|
|
|
|
tptr += sizeof(struct cfm_tlv_header_t);
|
|
tlen -= sizeof(struct cfm_tlv_header_t);
|
|
tlv_ptr = tptr;
|
|
|
|
/* did we capture enough for fully decoding the object ? */
|
|
if (cfm_tlv_type != CFM_TLV_END) {
|
|
TCHECK2(*tptr, cfm_tlv_len);
|
|
}
|
|
hexdump = FALSE;
|
|
|
|
switch(cfm_tlv_type) {
|
|
case CFM_TLV_END:
|
|
/* we are done - bail out */
|
|
return;
|
|
|
|
case CFM_TLV_PORT_STATUS:
|
|
printf(", Status: %s (%u)",
|
|
tok2str(cfm_tlv_port_status_values, "Unknown", *tptr),
|
|
*tptr);
|
|
break;
|
|
|
|
case CFM_TLV_INTERFACE_STATUS:
|
|
printf(", Status: %s (%u)",
|
|
tok2str(cfm_tlv_interface_status_values, "Unknown", *tptr),
|
|
*tptr);
|
|
break;
|
|
|
|
case CFM_TLV_PRIVATE:
|
|
printf(", Vendor: %s (%u), Sub-Type %u",
|
|
tok2str(oui_values,"Unknown", EXTRACT_24BITS(tptr)),
|
|
EXTRACT_24BITS(tptr),
|
|
*(tptr+3));
|
|
hexdump = TRUE;
|
|
break;
|
|
|
|
case CFM_TLV_SENDER_ID:
|
|
{
|
|
u_int chassis_id_type, chassis_id_length;
|
|
u_int mgmt_addr_length;
|
|
|
|
/*
|
|
* Check if there is a Chassis-ID.
|
|
*/
|
|
chassis_id_length = *tptr;
|
|
if (chassis_id_length > tlen) {
|
|
hexdump = TRUE;
|
|
break;
|
|
}
|
|
|
|
tptr++;
|
|
tlen--;
|
|
|
|
if (chassis_id_length) {
|
|
chassis_id_type = *tptr;
|
|
printf("\n\t Chassis-ID Type %s (%u), Chassis-ID length %u",
|
|
tok2str(cfm_tlv_senderid_chassisid_values,
|
|
"Unknown",
|
|
chassis_id_type),
|
|
chassis_id_type,
|
|
chassis_id_length);
|
|
|
|
switch (chassis_id_type) {
|
|
case CFM_CHASSIS_ID_MAC_ADDRESS:
|
|
printf("\n\t MAC %s", etheraddr_string(tptr+1));
|
|
break;
|
|
|
|
case CFM_CHASSIS_ID_NETWORK_ADDRESS:
|
|
hexdump |= cfm_mgmt_addr_print(tptr);
|
|
break;
|
|
|
|
case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
|
|
case CFM_CHASSIS_ID_INTERFACE_ALIAS:
|
|
case CFM_CHASSIS_ID_LOCAL:
|
|
case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
|
|
case CFM_CHASSIS_ID_PORT_COMPONENT:
|
|
safeputs((const char *)tptr+1, chassis_id_length);
|
|
break;
|
|
|
|
default:
|
|
hexdump = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
tptr += chassis_id_length;
|
|
tlen -= chassis_id_length;
|
|
|
|
/*
|
|
* Check if there is a Management Address.
|
|
*/
|
|
mgmt_addr_length = *tptr;
|
|
if (mgmt_addr_length > tlen) {
|
|
hexdump = TRUE;
|
|
break;
|
|
}
|
|
|
|
tptr++;
|
|
tlen--;
|
|
|
|
if (mgmt_addr_length) {
|
|
hexdump |= cfm_mgmt_addr_print(tptr);
|
|
}
|
|
|
|
tptr += mgmt_addr_length;
|
|
tlen -= mgmt_addr_length;
|
|
|
|
}
|
|
break;
|
|
|
|
/*
|
|
* FIXME those are the defined TLVs that lack a decoder
|
|
* you are welcome to contribute code ;-)
|
|
*/
|
|
|
|
case CFM_TLV_DATA:
|
|
case CFM_TLV_REPLY_INGRESS:
|
|
case CFM_TLV_REPLY_EGRESS:
|
|
default:
|
|
hexdump = TRUE;
|
|
break;
|
|
}
|
|
/* do we want to see an additional hexdump ? */
|
|
if (hexdump || vflag > 1)
|
|
print_unknown_data(tlv_ptr, "\n\t ", cfm_tlv_len);
|
|
|
|
tptr+=cfm_tlv_len;
|
|
tlen-=cfm_tlv_len;
|
|
}
|
|
return;
|
|
trunc:
|
|
printf("\n\t\t packet exceeded snapshot");
|
|
}
|