363 lines
8.5 KiB
C
363 lines
8.5 KiB
C
/*
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* Copyright (c) 1998-2011 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 The RPKI/Router Protocol as RFC6810
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*
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* Original code by Hannes Gredler (hannes@juniper.net)
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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 <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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* RPKI/Router PDU header
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*
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* Here's what the PDU header looks like.
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* The length does include the version and length fields.
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*/
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typedef struct rpki_rtr_pdu_ {
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u_char version; /* Version number */
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u_char pdu_type; /* PDU type */
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union {
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u_char session_id[2]; /* Session id */
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u_char error_code[2]; /* Error code */
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} u;
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u_char length[4];
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} rpki_rtr_pdu;
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#define RPKI_RTR_PDU_OVERHEAD (offsetof(rpki_rtr_pdu, rpki_rtr_pdu_msg))
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/*
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* IPv4 Prefix PDU.
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*/
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typedef struct rpki_rtr_pdu_ipv4_prefix_ {
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rpki_rtr_pdu pdu_header;
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u_char flags;
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u_char prefix_length;
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u_char max_length;
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u_char zero;
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u_char prefix[4];
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u_char as[4];
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} rpki_rtr_pdu_ipv4_prefix;
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/*
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* IPv6 Prefix PDU.
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*/
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typedef struct rpki_rtr_pdu_ipv6_prefix_ {
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rpki_rtr_pdu pdu_header;
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u_char flags;
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u_char prefix_length;
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u_char max_length;
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u_char zero;
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u_char prefix[16];
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u_char as[4];
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} rpki_rtr_pdu_ipv6_prefix;
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/*
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* Error report PDU.
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*/
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typedef struct rpki_rtr_pdu_error_report_ {
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rpki_rtr_pdu pdu_header;
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u_char encapsulated_pdu_length[4]; /* Encapsulated PDU length */
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} rpki_rtr_pdu_error_report;
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/*
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* PDU type codes
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*/
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#define RPKI_RTR_SERIAL_NOTIFY_PDU 0
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#define RPKI_RTR_SERIAL_QUERY_PDU 1
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#define RPKI_RTR_RESET_QUERY_PDU 2
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#define RPKI_RTR_CACHE_RESPONSE_PDU 3
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#define RPKI_RTR_IPV4_PREFIX_PDU 4
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#define RPKI_RTR_IPV6_PREFIX_PDU 6
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#define RPKI_RTR_END_OF_DATA_PDU 7
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#define RPKI_RTR_CACHE_RESET_PDU 8
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#define RPKI_RTR_ERROR_REPORT_PDU 10
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static const struct tok rpki_rtr_pdu_values[] = {
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{ RPKI_RTR_SERIAL_NOTIFY_PDU, "Serial Notify" },
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{ RPKI_RTR_SERIAL_QUERY_PDU, "Serial Query" },
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{ RPKI_RTR_RESET_QUERY_PDU, "Reset Query" },
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{ RPKI_RTR_CACHE_RESPONSE_PDU, "Cache Response" },
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{ RPKI_RTR_IPV4_PREFIX_PDU, "IPV4 Prefix" },
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{ RPKI_RTR_IPV6_PREFIX_PDU, "IPV6 Prefix" },
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{ RPKI_RTR_END_OF_DATA_PDU, "End of Data" },
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{ RPKI_RTR_CACHE_RESET_PDU, "Cache Reset" },
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{ RPKI_RTR_ERROR_REPORT_PDU, "Error Report" },
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{ 0, NULL}
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};
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static const struct tok rpki_rtr_error_codes[] = {
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{ 0, "Corrupt Data" },
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{ 1, "Internal Error" },
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{ 2, "No Data Available" },
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{ 3, "Invalid Request" },
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{ 4, "Unsupported Protocol Version" },
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{ 5, "Unsupported PDU Type" },
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{ 6, "Withdrawal of Unknown Record" },
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{ 7, "Duplicate Announcement Received" },
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{ 0, NULL}
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};
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/*
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* Build a identation string for a given identation level.
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* XXX this should be really in util.c
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*/
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static char *
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indent_string (u_int indent)
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{
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static char buf[20];
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u_int idx;
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idx = 0;
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buf[idx] = '\0';
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/*
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* Does the static buffer fit ?
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*/
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if (sizeof(buf) < ((indent/8) + (indent %8) + 2)) {
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return buf;
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}
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/*
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* Heading newline.
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*/
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buf[idx] = '\n';
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idx++;
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while (indent >= 8) {
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buf[idx] = '\t';
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idx++;
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indent -= 8;
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}
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while (indent > 0) {
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buf[idx] = ' ';
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idx++;
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indent--;
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}
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/*
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* Trailing zero.
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*/
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buf[idx] = '\0';
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return buf;
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}
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/*
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* Print a single PDU.
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*/
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static void
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rpki_rtr_pdu_print (netdissect_options *ndo, const u_char *tptr, u_int indent)
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{
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const rpki_rtr_pdu *pdu_header;
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u_int pdu_type, pdu_len, hexdump;
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const u_char *msg;
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pdu_header = (rpki_rtr_pdu *)tptr;
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pdu_type = pdu_header->pdu_type;
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pdu_len = EXTRACT_32BITS(pdu_header->length);
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hexdump = FALSE;
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ND_PRINT((ndo, "%sRPKI-RTRv%u, %s PDU (%u), length: %u",
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indent_string(8),
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pdu_header->version,
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tok2str(rpki_rtr_pdu_values, "Unknown", pdu_type),
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pdu_type, pdu_len));
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switch (pdu_type) {
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/*
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* The following PDUs share the message format.
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*/
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case RPKI_RTR_SERIAL_NOTIFY_PDU:
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case RPKI_RTR_SERIAL_QUERY_PDU:
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case RPKI_RTR_END_OF_DATA_PDU:
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msg = (const u_char *)(pdu_header + 1);
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ND_PRINT((ndo, "%sSession ID: 0x%04x, Serial: %u",
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indent_string(indent+2),
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EXTRACT_16BITS(pdu_header->u.session_id),
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EXTRACT_32BITS(msg)));
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break;
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/*
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* The following PDUs share the message format.
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*/
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case RPKI_RTR_RESET_QUERY_PDU:
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case RPKI_RTR_CACHE_RESET_PDU:
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/*
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* Zero payload PDUs.
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*/
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break;
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case RPKI_RTR_CACHE_RESPONSE_PDU:
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ND_PRINT((ndo, "%sSession ID: 0x%04x",
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indent_string(indent+2),
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EXTRACT_16BITS(pdu_header->u.session_id)));
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break;
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case RPKI_RTR_IPV4_PREFIX_PDU:
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{
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rpki_rtr_pdu_ipv4_prefix *pdu;
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pdu = (rpki_rtr_pdu_ipv4_prefix *)tptr;
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ND_PRINT((ndo, "%sIPv4 Prefix %s/%u-%u, origin-as %u, flags 0x%02x",
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indent_string(indent+2),
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ipaddr_string(ndo, pdu->prefix),
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pdu->prefix_length, pdu->max_length,
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EXTRACT_32BITS(pdu->as), pdu->flags));
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}
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break;
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#ifdef INET6
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case RPKI_RTR_IPV6_PREFIX_PDU:
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{
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rpki_rtr_pdu_ipv6_prefix *pdu;
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pdu = (rpki_rtr_pdu_ipv6_prefix *)tptr;
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ND_PRINT((ndo, "%sIPv6 Prefix %s/%u-%u, origin-as %u, flags 0x%02x",
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indent_string(indent+2),
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ip6addr_string(ndo, pdu->prefix),
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pdu->prefix_length, pdu->max_length,
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EXTRACT_32BITS(pdu->as), pdu->flags));
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}
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break;
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#endif
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case RPKI_RTR_ERROR_REPORT_PDU:
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{
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rpki_rtr_pdu_error_report *pdu;
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u_int encapsulated_pdu_length, text_length, tlen, error_code;
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u_char buf[80];
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pdu = (rpki_rtr_pdu_error_report *)tptr;
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encapsulated_pdu_length = EXTRACT_32BITS(pdu->encapsulated_pdu_length);
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tlen = pdu_len;
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error_code = EXTRACT_16BITS(pdu->pdu_header.u.error_code);
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ND_PRINT((ndo, "%sError code: %s (%u), Encapsulated PDU length: %u",
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indent_string(indent+2),
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tok2str(rpki_rtr_error_codes, "Unknown", error_code),
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error_code, encapsulated_pdu_length));
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tptr += sizeof(*pdu);
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tlen -= sizeof(*pdu);
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/*
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* Recurse if there is an encapsulated PDU.
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*/
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if (encapsulated_pdu_length &&
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(encapsulated_pdu_length <= tlen)) {
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ND_PRINT((ndo, "%s-----encapsulated PDU-----", indent_string(indent+4)));
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rpki_rtr_pdu_print(ndo, tptr, indent+2);
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}
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tptr += encapsulated_pdu_length;
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tlen -= encapsulated_pdu_length;
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/*
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* Extract, trail-zero and print the Error message.
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*/
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text_length = 0;
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if (tlen > 4) {
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text_length = EXTRACT_32BITS(tptr);
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tptr += 4;
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tlen -= 4;
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}
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if (text_length && (text_length <= tlen )) {
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memcpy(buf, tptr, min(sizeof(buf)-1, text_length));
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buf[text_length] = '\0';
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ND_PRINT((ndo, "%sError text: %s", indent_string(indent+2), buf));
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}
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}
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break;
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default:
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/*
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* Unknown data, please hexdump.
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*/
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hexdump = TRUE;
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}
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/* do we also want to see a hex dump ? */
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if (ndo->ndo_vflag > 1 || (ndo->ndo_vflag && hexdump)) {
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print_unknown_data(ndo,tptr,"\n\t ", pdu_len);
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}
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}
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void
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rpki_rtr_print(netdissect_options *ndo, register const u_char *pptr, register u_int len) {
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u_int tlen, pdu_type, pdu_len;
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const u_char *tptr;
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const rpki_rtr_pdu *pdu_header;
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tptr = pptr;
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tlen = len;
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if (!ndo->ndo_vflag) {
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ND_PRINT((ndo, ", RPKI-RTR"));
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return;
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}
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while (tlen >= sizeof(rpki_rtr_pdu)) {
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ND_TCHECK2(*tptr, sizeof(rpki_rtr_pdu));
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pdu_header = (rpki_rtr_pdu *)tptr;
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pdu_type = pdu_header->pdu_type;
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pdu_len = EXTRACT_32BITS(pdu_header->length);
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/* infinite loop check */
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if (!pdu_type || !pdu_len) {
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break;
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}
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ND_TCHECK2(*tptr, pdu_len);
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if (tlen < pdu_len) {
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goto trunc;
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}
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/*
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* Print the PDU.
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*/
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rpki_rtr_pdu_print(ndo, tptr, 8);
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tlen -= pdu_len;
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tptr += pdu_len;
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}
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return;
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trunc:
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ND_PRINT((ndo, "\n\t[|RPKI-RTR]"));
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}
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/*
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* Local Variables:
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* c-style: whitesmith
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* c-basic-offset: 4
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* End:
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*/
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