mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-23 18:14:29 +08:00
ccc83a4e2e
Enable ND_LONGJMP_FROM_TCHECK. Use ND_ICHECK*() for length checks. Fix some length checks. Add and use standard "invalid" sections. Remove the redundant ND_TCHECK*() instances. Add a ND_TCHECK_1(). Factorize some codes. Update default format for tok2str() calls. Indicate better invalid packet types, invalid option types, invalid reset codes and invalid features. Fix process for DCCP_OPTION_CHANGE_L/DCCP_OPTION_CHANGE_R, not the same that DCCP_OPTION_CONFIRM_L/DCCP_OPTION_CONFIRM_R process. Remove spaces in some dccp_feature_num_str[] strings. Update the output of a test accordingly.
630 lines
17 KiB
C
630 lines
17 KiB
C
/*
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* Copyright (C) Arnaldo Carvalho de Melo 2004
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* Copyright (C) Ian McDonald 2005
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* Copyright (C) Yoshifumi Nishida 2005
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*
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* This software may be distributed either under the terms of the
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* BSD-style license that accompanies tcpdump or the GNU GPL version 2
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*/
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/* \summary: Datagram Congestion Control Protocol (DCCP) printer */
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/* specification: RFC 4340 */
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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 "netdissect-stdinc.h"
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#define ND_LONGJMP_FROM_TCHECK
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.h"
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#include "ip.h"
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#include "ip6.h"
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#include "ipproto.h"
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/* RFC4340: Datagram Congestion Control Protocol (DCCP) */
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/**
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* struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
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* sequence number
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*
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* @dccph_sport - Relevant port on the endpoint that sent this packet
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* @dccph_dport - Relevant port on the other endpoint
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* @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
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* @dccph_ccval - Used by the HC-Sender CCID
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* @dccph_cscov - Parts of the packet that are covered by the Checksum field
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* @dccph_checksum - Internet checksum, depends on dccph_cscov
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* @dccph_x - 0 = 24 bit sequence number, 1 = 48
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* @dccph_type - packet type, see DCCP_PKT_ prefixed macros
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* @dccph_seq - 24-bit sequence number
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*/
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struct dccp_hdr {
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nd_uint16_t dccph_sport,
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dccph_dport;
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nd_uint8_t dccph_doff;
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nd_uint8_t dccph_ccval_cscov;
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nd_uint16_t dccph_checksum;
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nd_uint8_t dccph_xtr;
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nd_uint24_t dccph_seq;
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};
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/**
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* struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
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* sequence number
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*
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* @dccph_sport - Relevant port on the endpoint that sent this packet
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* @dccph_dport - Relevant port on the other endpoint
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* @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
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* @dccph_ccval - Used by the HC-Sender CCID
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* @dccph_cscov - Parts of the packet that are covered by the Checksum field
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* @dccph_checksum - Internet checksum, depends on dccph_cscov
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* @dccph_x - 0 = 24 bit sequence number, 1 = 48
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* @dccph_type - packet type, see DCCP_PKT_ prefixed macros
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* @dccph_seq - 48-bit sequence number
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*/
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struct dccp_hdr_ext {
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nd_uint16_t dccph_sport,
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dccph_dport;
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nd_uint8_t dccph_doff;
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nd_uint8_t dccph_ccval_cscov;
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nd_uint16_t dccph_checksum;
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nd_uint8_t dccph_xtr;
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nd_uint8_t reserved;
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nd_uint48_t dccph_seq;
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};
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#define DCCPH_CCVAL(dh) ((GET_U_1((dh)->dccph_ccval_cscov) >> 4) & 0xF)
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#define DCCPH_CSCOV(dh) (GET_U_1((dh)->dccph_ccval_cscov) & 0xF)
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#define DCCPH_X(dh) (GET_U_1((dh)->dccph_xtr) & 1)
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#define DCCPH_TYPE(dh) ((GET_U_1((dh)->dccph_xtr) >> 1) & 0xF)
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/**
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* struct dccp_hdr_request - Connection initiation request header
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*
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* @dccph_req_service - Service to which the client app wants to connect
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*/
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struct dccp_hdr_request {
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nd_uint32_t dccph_req_service;
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};
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/**
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* struct dccp_hdr_response - Connection initiation response header
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*
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* @dccph_resp_ack - 48 bit ack number, contains GSR
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* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
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*/
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struct dccp_hdr_response {
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nd_uint64_t dccph_resp_ack; /* always 8 bytes, first 2 reserved */
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nd_uint32_t dccph_resp_service;
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};
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/**
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* struct dccp_hdr_reset - Unconditionally shut down a connection
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*
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* @dccph_resp_ack - 48 bit ack number
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* @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
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*/
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struct dccp_hdr_reset {
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nd_uint64_t dccph_reset_ack; /* always 8 bytes, first 2 reserved */
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nd_uint8_t dccph_reset_code;
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nd_uint8_t dccph_reset_data1;
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nd_uint8_t dccph_reset_data2;
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nd_uint8_t dccph_reset_data3;
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};
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enum dccp_pkt_type {
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DCCP_PKT_REQUEST = 0,
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DCCP_PKT_RESPONSE,
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DCCP_PKT_DATA,
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DCCP_PKT_ACK,
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DCCP_PKT_DATAACK,
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DCCP_PKT_CLOSEREQ,
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DCCP_PKT_CLOSE,
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DCCP_PKT_RESET,
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DCCP_PKT_SYNC,
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DCCP_PKT_SYNCACK
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};
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static const struct tok dccp_pkt_type_str[] = {
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{ DCCP_PKT_REQUEST, "DCCP-Request" },
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{ DCCP_PKT_RESPONSE, "DCCP-Response" },
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{ DCCP_PKT_DATA, "DCCP-Data" },
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{ DCCP_PKT_ACK, "DCCP-Ack" },
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{ DCCP_PKT_DATAACK, "DCCP-DataAck" },
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{ DCCP_PKT_CLOSEREQ, "DCCP-CloseReq" },
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{ DCCP_PKT_CLOSE, "DCCP-Close" },
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{ DCCP_PKT_RESET, "DCCP-Reset" },
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{ DCCP_PKT_SYNC, "DCCP-Sync" },
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{ DCCP_PKT_SYNCACK, "DCCP-SyncAck" },
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{ 0, NULL}
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};
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enum dccp_reset_codes {
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DCCP_RESET_CODE_UNSPECIFIED = 0,
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DCCP_RESET_CODE_CLOSED,
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DCCP_RESET_CODE_ABORTED,
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DCCP_RESET_CODE_NO_CONNECTION,
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DCCP_RESET_CODE_PACKET_ERROR,
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DCCP_RESET_CODE_OPTION_ERROR,
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DCCP_RESET_CODE_MANDATORY_ERROR,
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DCCP_RESET_CODE_CONNECTION_REFUSED,
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DCCP_RESET_CODE_BAD_SERVICE_CODE,
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DCCP_RESET_CODE_TOO_BUSY,
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DCCP_RESET_CODE_BAD_INIT_COOKIE,
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DCCP_RESET_CODE_AGGRESSION_PENALTY,
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};
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static const struct tok dccp_reset_code_str[] = {
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{ DCCP_RESET_CODE_UNSPECIFIED, "unspecified" },
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{ DCCP_RESET_CODE_CLOSED, "closed" },
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{ DCCP_RESET_CODE_ABORTED, "aborted" },
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{ DCCP_RESET_CODE_NO_CONNECTION, "no_connection" },
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{ DCCP_RESET_CODE_PACKET_ERROR, "packet_error" },
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{ DCCP_RESET_CODE_OPTION_ERROR, "option_error" },
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{ DCCP_RESET_CODE_MANDATORY_ERROR, "mandatory_error" },
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{ DCCP_RESET_CODE_CONNECTION_REFUSED, "connection_refused" },
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{ DCCP_RESET_CODE_BAD_SERVICE_CODE, "bad_service_code" },
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{ DCCP_RESET_CODE_TOO_BUSY, "too_busy" },
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{ DCCP_RESET_CODE_BAD_INIT_COOKIE, "bad_init_cookie" },
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{ DCCP_RESET_CODE_AGGRESSION_PENALTY, "aggression_penalty" },
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{ 0, NULL }
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};
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static const struct tok dccp_feature_num_str[] = {
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{ 0, "reserved" },
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{ 1, "ccid" },
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{ 2, "allow_short_seqno" },
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{ 3, "sequence_window" },
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{ 4, "ecn_incapable" },
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{ 5, "ack_ratio" },
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{ 6, "send_ack_vector" },
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{ 7, "send_ndp_count" },
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{ 8, "minimum_checksum_coverage" },
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{ 9, "check_data_checksum" },
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{ 0, NULL }
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};
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static u_int
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dccp_csum_coverage(netdissect_options *ndo,
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const struct dccp_hdr *dh, u_int len)
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{
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u_int cov;
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if (DCCPH_CSCOV(dh) == 0)
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return len;
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cov = (GET_U_1(dh->dccph_doff) + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
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return (cov > len)? len : cov;
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}
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static uint16_t dccp_cksum(netdissect_options *ndo, const struct ip *ip,
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const struct dccp_hdr *dh, u_int len)
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{
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return nextproto4_cksum(ndo, ip, (const uint8_t *)(const void *)dh, len,
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dccp_csum_coverage(ndo, dh, len), IPPROTO_DCCP);
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}
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static uint16_t dccp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
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const struct dccp_hdr *dh, u_int len)
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{
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return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)dh, len,
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dccp_csum_coverage(ndo, dh, len), IPPROTO_DCCP);
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}
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static uint64_t
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dccp_seqno(netdissect_options *ndo, const u_char *bp)
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{
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const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
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uint64_t seqno;
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if (DCCPH_X(dh) != 0) {
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const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
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seqno = GET_BE_U_6(dhx->dccph_seq);
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} else {
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seqno = GET_BE_U_3(dh->dccph_seq);
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}
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return seqno;
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}
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static unsigned int
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dccp_basic_hdr_len(netdissect_options *ndo, const struct dccp_hdr *dh)
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{
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return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
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}
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static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
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{
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const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
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const u_char *ackp = bp + dccp_basic_hdr_len(ndo, dh);
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uint64_t ackno;
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if (DCCPH_X(dh) != 0) {
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ackno = GET_BE_U_6(ackp + 2);
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} else {
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ackno = GET_BE_U_3(ackp + 1);
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}
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ND_PRINT("(ack=%" PRIu64 ") ", ackno);
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}
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static u_int dccp_print_option(netdissect_options *, const u_char *, u_int);
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/**
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* dccp_print - show dccp packet
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* @bp - beginning of dccp packet
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* @data2 - beginning of enclosing
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* @len - length of ip packet
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*/
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void
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dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
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u_int length)
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{
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const struct dccp_hdr *dh;
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const struct ip *ip;
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const struct ip6_hdr *ip6;
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const u_char *cp;
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u_short sport, dport;
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u_int hlen;
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u_int fixed_hdrlen;
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uint8_t dccph_type;
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ndo->ndo_protocol = "dccp";
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dh = (const struct dccp_hdr *)bp;
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ip = (const struct ip *)data2;
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if (IP_V(ip) == 6)
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ip6 = (const struct ip6_hdr *)data2;
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else
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ip6 = NULL;
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cp = (const u_char *)(dh + 1);
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ND_ICHECK_ZU(length, <, sizeof(struct dccp_hdr));
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/* get the length of the generic header */
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fixed_hdrlen = dccp_basic_hdr_len(ndo, dh);
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ND_ICHECK_U(length, <, fixed_hdrlen);
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ND_TCHECK_LEN(dh, fixed_hdrlen);
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sport = GET_BE_U_2(dh->dccph_sport);
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dport = GET_BE_U_2(dh->dccph_dport);
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hlen = GET_U_1(dh->dccph_doff) * 4;
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if (ip6) {
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ND_PRINT("%s.%u > %s.%u: ",
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GET_IP6ADDR_STRING(ip6->ip6_src), sport,
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GET_IP6ADDR_STRING(ip6->ip6_dst), dport);
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} else {
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ND_PRINT("%s.%u > %s.%u: ",
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GET_IPADDR_STRING(ip->ip_src), sport,
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GET_IPADDR_STRING(ip->ip_dst), dport);
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}
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nd_print_protocol_caps(ndo);
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if (ndo->ndo_qflag) {
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ND_ICHECK_U(length, <, hlen);
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ND_PRINT(" %u", length - hlen);
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return;
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}
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/* other variables in generic header */
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if (ndo->ndo_vflag) {
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ND_PRINT(" (CCVal %u, CsCov %u", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh));
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/* checksum calculation */
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if (ND_TTEST_LEN(bp, length)) {
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uint16_t sum = 0, dccp_sum;
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dccp_sum = GET_BE_U_2(dh->dccph_checksum);
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ND_PRINT(", cksum 0x%04x ", dccp_sum);
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if (IP_V(ip) == 4)
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sum = dccp_cksum(ndo, ip, dh, length);
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else if (IP_V(ip) == 6)
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sum = dccp6_cksum(ndo, ip6, dh, length);
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if (sum != 0)
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ND_PRINT("(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum));
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else
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ND_PRINT("(correct)");
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}
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ND_PRINT(")");
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}
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dccph_type = DCCPH_TYPE(dh);
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ND_PRINT(" %s ", tok2str(dccp_pkt_type_str, "packet-type-%u",
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dccph_type));
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switch (dccph_type) {
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case DCCP_PKT_REQUEST: {
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const struct dccp_hdr_request *dhr =
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(const struct dccp_hdr_request *)(bp + fixed_hdrlen);
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fixed_hdrlen += 4;
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ND_ICHECK_U(length, <, fixed_hdrlen);
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ND_PRINT("(service=%u) ", GET_BE_U_4(dhr->dccph_req_service));
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break;
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}
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case DCCP_PKT_RESPONSE: {
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const struct dccp_hdr_response *dhr =
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(const struct dccp_hdr_response *)(bp + fixed_hdrlen);
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fixed_hdrlen += 12;
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ND_ICHECK_U(length, <, fixed_hdrlen);
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ND_PRINT("(service=%u) ", GET_BE_U_4(dhr->dccph_resp_service));
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break;
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}
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case DCCP_PKT_DATA:
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break;
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case DCCP_PKT_ACK: {
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fixed_hdrlen += 8;
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ND_ICHECK_U(length, <, fixed_hdrlen);
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break;
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}
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case DCCP_PKT_DATAACK: {
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fixed_hdrlen += 8;
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ND_ICHECK_U(length, <, fixed_hdrlen);
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break;
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}
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case DCCP_PKT_CLOSEREQ:
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fixed_hdrlen += 8;
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ND_ICHECK_U(length, <, fixed_hdrlen);
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break;
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case DCCP_PKT_CLOSE:
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fixed_hdrlen += 8;
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ND_ICHECK_U(length, <, fixed_hdrlen);
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break;
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case DCCP_PKT_RESET: {
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const struct dccp_hdr_reset *dhr =
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(const struct dccp_hdr_reset *)(bp + fixed_hdrlen);
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fixed_hdrlen += 12;
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ND_ICHECK_U(length, <, fixed_hdrlen);
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ND_TCHECK_SIZE(dhr);
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ND_PRINT("(code=%s) ", tok2str(dccp_reset_code_str,
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"reset-code-%u (invalid)", GET_U_1(dhr->dccph_reset_code)));
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break;
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}
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case DCCP_PKT_SYNC:
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fixed_hdrlen += 8;
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ND_ICHECK_U(length, <, fixed_hdrlen);
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break;
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case DCCP_PKT_SYNCACK:
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fixed_hdrlen += 8;
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ND_ICHECK_U(length, <, fixed_hdrlen);
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break;
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default:
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goto invalid;
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break;
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}
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if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
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(DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
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dccp_print_ack_no(ndo, bp);
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if (ndo->ndo_vflag < 2)
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return;
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ND_PRINT("seq %" PRIu64, dccp_seqno(ndo, bp));
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/* process options */
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if (hlen > fixed_hdrlen){
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u_int optlen;
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cp = bp + fixed_hdrlen;
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ND_PRINT(" <");
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hlen -= fixed_hdrlen;
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while(1){
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optlen = dccp_print_option(ndo, cp, hlen);
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if (!optlen)
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goto invalid;
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if (hlen <= optlen)
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break;
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hlen -= optlen;
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cp += optlen;
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ND_PRINT(", ");
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}
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ND_PRINT(">");
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}
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return;
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invalid:
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nd_print_invalid(ndo);
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}
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enum dccp_option_type {
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DCCP_OPTION_PADDING = 0,
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DCCP_OPTION_MANDATORY = 1,
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DCCP_OPTION_SLOW_RECEIVER = 2,
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DCCP_OPTION_CHANGE_L = 32,
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DCCP_OPTION_CONFIRM_L = 33,
|
|
DCCP_OPTION_CHANGE_R = 34,
|
|
DCCP_OPTION_CONFIRM_R = 35,
|
|
DCCP_OPTION_INIT_COOKIE = 36,
|
|
DCCP_OPTION_NDP_COUNT = 37,
|
|
DCCP_OPTION_ACK_VECTOR_NONCE_0 = 38,
|
|
DCCP_OPTION_ACK_VECTOR_NONCE_1 = 39,
|
|
DCCP_OPTION_DATA_DROPPED = 40,
|
|
DCCP_OPTION_TIMESTAMP = 41,
|
|
DCCP_OPTION_TIMESTAMP_ECHO = 42,
|
|
DCCP_OPTION_ELAPSED_TIME = 43,
|
|
DCCP_OPTION_DATA_CHECKSUM = 44
|
|
};
|
|
|
|
static const struct tok dccp_option_values[] = {
|
|
{ DCCP_OPTION_PADDING, "nop" },
|
|
{ DCCP_OPTION_MANDATORY, "mandatory" },
|
|
{ DCCP_OPTION_SLOW_RECEIVER, "slowreceiver" },
|
|
{ DCCP_OPTION_CHANGE_L, "change_l" },
|
|
{ DCCP_OPTION_CONFIRM_L, "confirm_l" },
|
|
{ DCCP_OPTION_CHANGE_R, "change_r" },
|
|
{ DCCP_OPTION_CONFIRM_R, "confirm_r" },
|
|
{ DCCP_OPTION_INIT_COOKIE, "initcookie" },
|
|
{ DCCP_OPTION_NDP_COUNT, "ndp_count" },
|
|
{ DCCP_OPTION_ACK_VECTOR_NONCE_0, "ack_vector0" },
|
|
{ DCCP_OPTION_ACK_VECTOR_NONCE_1, "ack_vector1" },
|
|
{ DCCP_OPTION_DATA_DROPPED, "data_dropped" },
|
|
{ DCCP_OPTION_TIMESTAMP, "timestamp" },
|
|
{ DCCP_OPTION_TIMESTAMP_ECHO, "timestamp_echo" },
|
|
{ DCCP_OPTION_ELAPSED_TIME, "elapsed_time" },
|
|
{ DCCP_OPTION_DATA_CHECKSUM, "data_checksum" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static u_int
|
|
dccp_print_option(netdissect_options *ndo, const u_char *bp, u_int hlen)
|
|
{
|
|
uint8_t option, optlen, i;
|
|
|
|
option = GET_U_1(bp);
|
|
if (option >= 128)
|
|
ND_PRINT("CCID option %u", option);
|
|
else
|
|
ND_PRINT("%s",
|
|
tok2str(dccp_option_values, "option-type-%u", option));
|
|
if (option >= 32) {
|
|
optlen = GET_U_1(bp + 1);
|
|
ND_ICHECK_U(optlen, <, 2);
|
|
} else
|
|
optlen = 1;
|
|
|
|
ND_ICHECKMSG_U("remaining length", hlen, <, optlen);
|
|
|
|
if (option >= 128) {
|
|
switch (optlen) {
|
|
case 4:
|
|
ND_PRINT(" %u", GET_BE_U_2(bp + 2));
|
|
break;
|
|
case 6:
|
|
ND_PRINT(" %u", GET_BE_U_4(bp + 2));
|
|
break;
|
|
default:
|
|
ND_PRINT(" 0x");
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT("%02x", GET_U_1(bp + 2 + i));
|
|
break;
|
|
}
|
|
} else {
|
|
switch (option) {
|
|
case DCCP_OPTION_PADDING:
|
|
case DCCP_OPTION_MANDATORY:
|
|
case DCCP_OPTION_SLOW_RECEIVER:
|
|
ND_TCHECK_1(bp);
|
|
break;
|
|
case DCCP_OPTION_CHANGE_L:
|
|
case DCCP_OPTION_CHANGE_R:
|
|
ND_ICHECK_U(optlen, <, 4);
|
|
ND_PRINT(" %s", tok2str(dccp_feature_num_str,
|
|
"feature-number-%u (invalid)", GET_U_1(bp + 2)));
|
|
for (i = 0; i < optlen - 3; i++)
|
|
ND_PRINT(" %u", GET_U_1(bp + 3 + i));
|
|
break;
|
|
case DCCP_OPTION_CONFIRM_L:
|
|
case DCCP_OPTION_CONFIRM_R:
|
|
ND_ICHECK_U(optlen, <, 3);
|
|
ND_PRINT(" %s", tok2str(dccp_feature_num_str,
|
|
"feature-number-%u (invalid)", GET_U_1(bp + 2)));
|
|
for (i = 0; i < optlen - 3; i++)
|
|
ND_PRINT(" %u", GET_U_1(bp + 3 + i));
|
|
break;
|
|
case DCCP_OPTION_INIT_COOKIE:
|
|
ND_ICHECK_U(optlen, <, 3);
|
|
ND_PRINT(" 0x");
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT("%02x", GET_U_1(bp + 2 + i));
|
|
break;
|
|
case DCCP_OPTION_NDP_COUNT:
|
|
ND_ICHECK_U(optlen, <, 3);
|
|
ND_ICHECK_U(optlen, >, 8);
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT(" %u", GET_U_1(bp + 2 + i));
|
|
break;
|
|
case DCCP_OPTION_ACK_VECTOR_NONCE_0:
|
|
case DCCP_OPTION_ACK_VECTOR_NONCE_1:
|
|
ND_ICHECK_U(optlen, <, 3);
|
|
ND_PRINT(" 0x");
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT("%02x", GET_U_1(bp + 2 + i));
|
|
break;
|
|
case DCCP_OPTION_DATA_DROPPED:
|
|
ND_ICHECK_U(optlen, <, 3);
|
|
ND_PRINT(" 0x");
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT("%02x", GET_U_1(bp + 2 + i));
|
|
break;
|
|
case DCCP_OPTION_TIMESTAMP:
|
|
/*
|
|
* 13.1. Timestamp Option
|
|
*
|
|
* +--------+--------+--------+--------+--------+--------+
|
|
* |00101001|00000110| Timestamp Value |
|
|
* +--------+--------+--------+--------+--------+--------+
|
|
* Type=41 Length=6
|
|
*/
|
|
ND_ICHECK_U(optlen, !=, 6);
|
|
ND_PRINT(" %u", GET_BE_U_4(bp + 2));
|
|
break;
|
|
case DCCP_OPTION_TIMESTAMP_ECHO:
|
|
/*
|
|
* 13.3. Timestamp Echo Option
|
|
*
|
|
* +--------+--------+--------+--------+--------+--------+
|
|
* |00101010|00000110| Timestamp Echo |
|
|
* +--------+--------+--------+--------+--------+--------+
|
|
* Type=42 Len=6
|
|
*
|
|
* +--------+--------+------- ... -------+--------+--------+
|
|
* |00101010|00001000| Timestamp Echo | Elapsed Time |
|
|
* +--------+--------+------- ... -------+--------+--------+
|
|
* Type=42 Len=8 (4 bytes)
|
|
*
|
|
* +--------+--------+------- ... -------+------- ... -------+
|
|
* |00101010|00001010| Timestamp Echo | Elapsed Time |
|
|
* +--------+--------+------- ... -------+------- ... -------+
|
|
* Type=42 Len=10 (4 bytes) (4 bytes)
|
|
*/
|
|
switch (optlen) {
|
|
case 6:
|
|
ND_PRINT(" %u", GET_BE_U_4(bp + 2));
|
|
break;
|
|
case 8:
|
|
ND_PRINT(" %u", GET_BE_U_4(bp + 2));
|
|
ND_PRINT(" (elapsed time %u)",
|
|
GET_BE_U_2(bp + 6));
|
|
break;
|
|
case 10:
|
|
ND_PRINT(" %u", GET_BE_U_4(bp + 2));
|
|
ND_PRINT(" (elapsed time %u)",
|
|
GET_BE_U_4(bp + 6));
|
|
break;
|
|
default:
|
|
ND_PRINT(" [optlen != 6 or 8 or 10]");
|
|
goto invalid;
|
|
break;
|
|
}
|
|
break;
|
|
case DCCP_OPTION_ELAPSED_TIME:
|
|
switch (optlen) {
|
|
case 4:
|
|
ND_PRINT(" %u", GET_BE_U_2(bp + 2));
|
|
break;
|
|
case 6:
|
|
ND_PRINT(" %u", GET_BE_U_4(bp + 2));
|
|
break;
|
|
default:
|
|
ND_PRINT(" [optlen != 4 or 6]");
|
|
goto invalid;
|
|
}
|
|
break;
|
|
case DCCP_OPTION_DATA_CHECKSUM:
|
|
ND_ICHECK_U(optlen, !=, 6);
|
|
ND_PRINT(" 0x");
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT("%02x", GET_U_1(bp + 2 + i));
|
|
break;
|
|
default:
|
|
goto invalid;
|
|
}
|
|
}
|
|
|
|
return optlen;
|
|
invalid:
|
|
return 0;
|
|
}
|