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tcpdump/print-ldp.c

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C
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/*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, and (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the distribution.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* Original code by Hannes Gredler (hannes@juniper.net)
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-ldp.c,v 1.2 2002-12-13 14:29:24 hannes Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "interface.h"
#include "extract.h"
#include "addrtoname.h"
/*
* ldp common header
*
* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Version | PDU Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | LDP Identifier |
* + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
struct ldp_common_header {
u_int8_t version[2];
u_int8_t pdu_length[2];
u_int8_t lsr_id[4];
u_int8_t label_space[2];
};
#define LDP_VERSION 1
/*
* ldp message header
*
* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |U| Message Type | Message Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Message ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* + +
* | Mandatory Parameters |
* + +
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* + +
* | Optional Parameters |
* + +
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct ldp_msg_header {
u_int8_t type[2];
u_int8_t length[2];
u_int8_t id[4];
};
#define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff)
#define LDP_MASK_U_BIT(x) ((x)&0x8000)
#define LDP_MSG_NOTIF 0x0001
#define LDP_MSG_HELLO 0x0100
#define LDP_MSG_INIT 0x0200
#define LDP_MSG_KEEPALIVE 0x0201
#define LDP_MSG_ADDRESS 0x0300
#define LDP_MSG_ADDRESS_WITHDRAW 0x0301
#define LDP_MSG_LABEL_MAPPING 0x0400
#define LDP_MSG_LABEL_REQUEST 0x0401
#define LDP_MSG_LABEL_WITHDRAW 0x0402
#define LDP_MSG_LABEL_RELEASE 0x0403
#define LDP_MSG_LABEL_ABORT_REQUEST 0x0404
#define LDP_VENDOR_PRIVATE_MIN 0x3e00
#define LDP_VENDOR_PRIVATE_MAX 0x3eff
#define LDP_EXPERIMENTAL_MIN 0x3f00
#define LDP_EXPERIMENTAL_MAX 0x3fff
static const struct tok ldp_msg_values[] = {
{ LDP_MSG_NOTIF, "Notification" },
{ LDP_MSG_HELLO, "Hello" },
{ LDP_MSG_INIT, "Initialization" },
{ LDP_MSG_KEEPALIVE, "Keepalive" },
{ LDP_MSG_ADDRESS, "Address" },
{ LDP_MSG_ADDRESS_WITHDRAW, "Address Widthdraw" },
{ LDP_MSG_LABEL_MAPPING, "Label Mapping" },
{ LDP_MSG_LABEL_REQUEST, "Label Request" },
{ LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" },
{ LDP_MSG_LABEL_RELEASE, "Label Release" },
{ LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" },
{ 0, NULL}
};
/*
* ldp tlv header
*
* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |U|F| Type | Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* | Value |
* ~ ~
* | |
* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct ldp_tlv_header {
u_int8_t type[2];
u_int8_t length[2];
};
#define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
#define LDP_MASK_F_BIT(x) ((x)&0x4000)
#define LDP_TLV_FEC 0x0100
#define LDP_TLV_ADDRESS_LIST 0x0101
#define LDP_TLV_HOP_COUNT 0x0103
#define LDP_TLV_PATH_VECTOR 0x0104
#define LDP_TLV_GENERIC_LABEL 0x0200
#define LDP_TLV_ATM_LABEL 0x0201
#define LDP_TLV_FR_LABEL 0x0202
#define LDP_TLV_STATUS 0x0300
#define LDP_TLV_EXTD_STATUS 0x0301
#define LDP_TLV_RETURNED_PDU 0x0302
#define LDP_TLV_RETURNED_MSG 0x0303
#define LDP_TLV_COMMON_HELLO 0x0400
#define LDP_TLV_IPV4_TRASNPORT_ADDR 0x0401
#define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402
#define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403
#define LDP_TLV_COMMON_SESSION 0x0500
#define LDP_TLV_ATM_SESSION_PARM 0x0501
#define LDP_TLV_FR_SESSION_PARM 0x0502
#define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
static const struct tok ldp_tlv_values[] = {
{ LDP_TLV_FEC, "FEC" },
{ LDP_TLV_ADDRESS_LIST, "Address List" },
{ LDP_TLV_HOP_COUNT, "Hop Count" },
{ LDP_TLV_PATH_VECTOR, "Path Vector" },
{ LDP_TLV_GENERIC_LABEL, "Generic Label" },
{ LDP_TLV_ATM_LABEL, "ATM Label" },
{ LDP_TLV_FR_LABEL, "Frame-Relay Label" },
{ LDP_TLV_STATUS, "Status" },
{ LDP_TLV_EXTD_STATUS, "Extended Status" },
{ LDP_TLV_RETURNED_PDU, "Returned PDU" },
{ LDP_TLV_RETURNED_MSG, "Returned Message" },
{ LDP_TLV_COMMON_HELLO, "Common Hello Parameters" },
{ LDP_TLV_IPV4_TRASNPORT_ADDR, "IPv4 Transport Address" },
{ LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" },
{ LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" },
{ LDP_TLV_COMMON_SESSION, "Common Session Parameters" },
{ LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" },
{ LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
{ LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
{ 0, NULL}
};
#define FALSE 0
#define TRUE 1
void
ldp_print(register const u_char *pptr, register u_int len) {
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 msg_len,msg_type,msg_tlen;
int hexdump;
tptr=pptr;
ldp_com_header = (const struct ldp_common_header *)pptr;
TCHECK(*ldp_com_header);
/*
* Sanity checking of the header.
*/
if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
printf("LDP version %u packet not supported",
EXTRACT_16BITS(&ldp_com_header->version));
return;
}
/* print the LSR-ID, label-space & length */
printf("%sLDP, Label-Space-ID: %s:%u, length: %u",
(vflag < 1) ? "" : "\n\t",
ipaddr_string(&ldp_com_header->lsr_id),
EXTRACT_16BITS(&ldp_com_header->label_space),
len);
/* bail out if non-verbose */
if (vflag < 1)
return;
/* ok they seem to want to know everything - lets fully decode it */
tlen=EXTRACT_16BITS(ldp_com_header->pdu_length);
tptr+=sizeof(const struct ldp_common_header);
tlen-=sizeof(const struct ldp_common_header);
while(tlen>0) {
/* did we capture enough for fully decoding the msg header ? */
if (!TTEST2(*tptr, sizeof(struct ldp_msg_header)))
goto trunc;
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 */
printf("\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 all and notify");
msg_tptr=tptr+sizeof(struct ldp_msg_header);
msg_tlen=msg_len-sizeof(struct ldp_msg_header);
/* did we capture enough for fully decoding the message ? */
if (!TTEST2(*tptr, msg_len))
goto trunc;
hexdump=FALSE;
switch(msg_type) {
/*
* FIXME those are the defined messages that lack a decoder
* you are welcome to contribute code ;-)
*/
case LDP_MSG_NOTIF:
case LDP_MSG_HELLO:
case LDP_MSG_INIT:
case LDP_MSG_KEEPALIVE:
case LDP_MSG_ADDRESS:
case LDP_MSG_ADDRESS_WITHDRAW:
case LDP_MSG_LABEL_MAPPING:
case LDP_MSG_LABEL_REQUEST:
case LDP_MSG_LABEL_WITHDRAW:
case LDP_MSG_LABEL_RELEASE:
case LDP_MSG_LABEL_ABORT_REQUEST:
default:
if (vflag <= 1)
print_unknown_data(msg_tptr,"\n\t ",msg_tlen);
break;
}
/* do we want to see an additionally hexdump ? */
if (vflag > 1 || hexdump==TRUE)
print_unknown_data(tptr+sizeof(sizeof(struct ldp_msg_header)),"\n\t ",
msg_len-sizeof(struct ldp_msg_header));
tptr+=msg_len;
tlen-=msg_len;
}
return;
trunc:
printf("\n\t\t packet exceeded snapshot");
}
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