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637 lines
15 KiB
C
637 lines
15 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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#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 <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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#include "ip.h"
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#ifdef INET6
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#include "ip6.h"
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#endif
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#include "ipproto.h"
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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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uint16_t dccph_sport,
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dccph_dport;
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uint8_t dccph_doff;
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uint8_t dccph_ccval_cscov;
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uint16_t dccph_checksum;
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uint8_t dccph_xtr;
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uint8_t dccph_seq[3];
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} UNALIGNED;
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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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uint16_t dccph_sport,
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dccph_dport;
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uint8_t dccph_doff;
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uint8_t dccph_ccval_cscov;
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uint16_t dccph_checksum;
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uint8_t dccph_xtr;
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uint8_t reserved;
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uint8_t dccph_seq[6];
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} UNALIGNED;
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#define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov >> 4) & 0xF)
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#define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov) & 0xF)
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#define DCCPH_X(dh) ((dh)->dccph_xtr & 1)
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#define DCCPH_TYPE(dh) (((dh)->dccph_xtr >> 1) & 0xF)
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/**
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* struct dccp_hdr_request - Conection 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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uint32_t dccph_req_service;
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} UNALIGNED;
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/**
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* struct dccp_hdr_response - Conection 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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uint8_t dccph_resp_ack[8]; /* always 8 bytes */
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uint32_t dccph_resp_service;
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} UNALIGNED;
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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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uint8_t dccph_reset_ack[8]; /* always 8 bytes */
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uint8_t dccph_reset_code,
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dccph_reset_data[3];
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} UNALIGNED;
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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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DCCP_PKT_INVALID
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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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__DCCP_RESET_CODE_LAST
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};
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static const char tstr[] = "[|dccp]";
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static const char *dccp_reset_codes[] = {
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"unspecified",
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"closed",
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"aborted",
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"no_connection",
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"packet_error",
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"option_error",
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"mandatory_error",
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"connection_refused",
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"bad_service_code",
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"too_busy",
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"bad_init_cookie",
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"aggression_penalty",
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};
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static const char *dccp_feature_nums[] = {
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"reserved",
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"ccid",
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"allow_short_seqno",
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"sequence_window",
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"ecn_incapable",
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"ack_ratio",
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"send_ack_vector",
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"send_ndp_count",
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"minimum checksum coverage",
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"check data checksum",
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};
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static inline u_int dccp_csum_coverage(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 = (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 int 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 *)(void *)dh, len,
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dccp_csum_coverage(dh, len), IPPROTO_DCCP);
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}
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#ifdef INET6
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static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
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{
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return nextproto6_cksum(ip6, (const uint8_t *)(void *)dh, len,
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dccp_csum_coverage(dh, len), IPPROTO_DCCP);
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}
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#endif
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static const char *dccp_reset_code(uint8_t code)
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{
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if (code >= __DCCP_RESET_CODE_LAST)
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return "invalid";
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return dccp_reset_codes[code];
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}
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static uint64_t dccp_seqno(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 = EXTRACT_48BITS(dhx->dccph_seq);
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} else {
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seqno = EXTRACT_24BITS(dh->dccph_seq);
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}
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return seqno;
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}
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static inline unsigned int dccp_basic_hdr_len(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(dh);
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uint64_t ackno;
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if (DCCPH_X(dh) != 0) {
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ND_TCHECK2(*ackp, 8);
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ackno = EXTRACT_48BITS(ackp + 2);
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} else {
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ND_TCHECK2(*ackp, 4);
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ackno = EXTRACT_24BITS(ackp + 1);
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}
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ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno));
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trunc:
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return;
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}
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static 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 - lenght of ip packet
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*/
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void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
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u_int len)
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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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#ifdef INET6
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const struct ip6_hdr *ip6;
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#endif
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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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dh = (const struct dccp_hdr *)bp;
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ip = (struct ip *)data2;
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#ifdef INET6
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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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#endif /*INET6*/
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/* make sure we have enough data to look at the X bit */
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cp = (const u_char *)(dh + 1);
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if (cp > ndo->ndo_snapend) {
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ND_PRINT((ndo, "[Invalid packet|dccp]"));
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return;
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}
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if (len < sizeof(struct dccp_hdr)) {
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ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
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len - (u_int)sizeof(struct dccp_hdr)));
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return;
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}
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/* get the length of the generic header */
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fixed_hdrlen = dccp_basic_hdr_len(dh);
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if (len < fixed_hdrlen) {
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ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
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len - fixed_hdrlen));
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return;
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}
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ND_TCHECK2(*dh, fixed_hdrlen);
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sport = EXTRACT_16BITS(&dh->dccph_sport);
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dport = EXTRACT_16BITS(&dh->dccph_dport);
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hlen = dh->dccph_doff * 4;
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#ifdef INET6
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if (ip6) {
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ND_PRINT((ndo, "%s.%d > %s.%d: ",
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ip6addr_string(ndo, &ip6->ip6_src), sport,
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ip6addr_string(ndo, &ip6->ip6_dst), dport));
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} else
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#endif /*INET6*/
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{
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ND_PRINT((ndo, "%s.%d > %s.%d: ",
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ipaddr_string(ndo, &ip->ip_src), sport,
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ipaddr_string(ndo, &ip->ip_dst), dport));
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}
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if (ndo->ndo_qflag) {
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ND_PRINT((ndo, " %d", len - hlen));
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if (hlen > len) {
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ND_PRINT((ndo, "dccp [bad hdr length %u - too long, > %u]",
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hlen, len));
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}
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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((ndo, "CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh)));
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}
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/* checksum calculation */
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if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
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uint16_t sum = 0, dccp_sum;
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dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
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ND_PRINT((ndo, "cksum 0x%04x ", dccp_sum));
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if (IP_V(ip) == 4)
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sum = dccp_cksum(ndo, ip, dh, len);
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#ifdef INET6
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else if (IP_V(ip) == 6)
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sum = dccp6_cksum(ip6, dh, len);
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#endif
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if (sum != 0)
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ND_PRINT((ndo, "(incorrect -> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum)));
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else
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ND_PRINT((ndo, "(correct), "));
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}
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switch (DCCPH_TYPE(dh)) {
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case DCCP_PKT_REQUEST: {
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struct dccp_hdr_request *dhr =
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(struct dccp_hdr_request *)(bp + fixed_hdrlen);
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fixed_hdrlen += 4;
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if (len < fixed_hdrlen) {
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ND_PRINT((ndo, "truncated-dccp request - %u bytes missing!",
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len - fixed_hdrlen));
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return;
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}
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ND_TCHECK(*dhr);
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ND_PRINT((ndo, "request (service=%d) ",
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EXTRACT_32BITS(&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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struct dccp_hdr_response *dhr =
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(struct dccp_hdr_response *)(bp + fixed_hdrlen);
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fixed_hdrlen += 12;
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if (len < fixed_hdrlen) {
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ND_PRINT((ndo, "truncated-dccp response - %u bytes missing!",
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len - fixed_hdrlen));
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return;
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}
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ND_TCHECK(*dhr);
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ND_PRINT((ndo, "response (service=%d) ",
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EXTRACT_32BITS(&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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ND_PRINT((ndo, "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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if (len < fixed_hdrlen) {
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ND_PRINT((ndo, "truncated-dccp ack - %u bytes missing!",
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len - fixed_hdrlen));
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return;
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}
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ND_PRINT((ndo, "ack "));
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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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if (len < fixed_hdrlen) {
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ND_PRINT((ndo, "truncated-dccp dataack - %u bytes missing!",
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len - fixed_hdrlen));
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return;
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}
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ND_PRINT((ndo, "dataack "));
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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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if (len < fixed_hdrlen) {
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ND_PRINT((ndo, "truncated-dccp closereq - %u bytes missing!",
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len - fixed_hdrlen));
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return;
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}
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ND_PRINT((ndo, "closereq "));
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break;
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case DCCP_PKT_CLOSE:
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fixed_hdrlen += 8;
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if (len < fixed_hdrlen) {
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ND_PRINT((ndo, "truncated-dccp close - %u bytes missing!",
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len - fixed_hdrlen));
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return;
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}
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ND_PRINT((ndo, "close "));
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break;
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case DCCP_PKT_RESET: {
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struct dccp_hdr_reset *dhr =
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(struct dccp_hdr_reset *)(bp + fixed_hdrlen);
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fixed_hdrlen += 12;
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if (len < fixed_hdrlen) {
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ND_PRINT((ndo, "truncated-dccp reset - %u bytes missing!",
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len - fixed_hdrlen));
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return;
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}
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ND_TCHECK(*dhr);
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ND_PRINT((ndo, "reset (code=%s) ",
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dccp_reset_code(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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if (len < fixed_hdrlen) {
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ND_PRINT((ndo, "truncated-dccp sync - %u bytes missing!",
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len - fixed_hdrlen));
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return;
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}
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ND_PRINT((ndo, "sync "));
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break;
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case DCCP_PKT_SYNCACK:
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fixed_hdrlen += 8;
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if (len < fixed_hdrlen) {
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ND_PRINT((ndo, "truncated-dccp syncack - %u bytes missing!",
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len - fixed_hdrlen));
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return;
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}
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ND_PRINT((ndo, "syncack "));
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break;
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default:
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ND_PRINT((ndo, "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((ndo, "seq %" PRIu64, dccp_seqno(bp)));
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/* process options */
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if (hlen > fixed_hdrlen){
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const u_char *cp;
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u_int optlen;
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cp = bp + fixed_hdrlen;
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ND_PRINT((ndo, " <"));
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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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break;
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if (hlen <= optlen)
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break;
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hlen -= optlen;
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cp += optlen;
|
|
ND_PRINT((ndo, ", "));
|
|
}
|
|
ND_PRINT((ndo, ">"));
|
|
}
|
|
return;
|
|
trunc:
|
|
ND_PRINT((ndo, "%s", tstr));
|
|
return;
|
|
}
|
|
|
|
static const struct tok dccp_option_values[] = {
|
|
{ 0, "nop" },
|
|
{ 1, "mandatory" },
|
|
{ 2, "slowreceiver" },
|
|
{ 32, "change_l" },
|
|
{ 33, "confirm_l" },
|
|
{ 34, "change_r" },
|
|
{ 35, "confirm_r" },
|
|
{ 36, "initcookie" },
|
|
{ 37, "ndp_count" },
|
|
{ 38, "ack_vector0" },
|
|
{ 39, "ack_vector1" },
|
|
{ 40, "data_dropped" },
|
|
{ 41, "timestamp" },
|
|
{ 42, "timestamp_echo" },
|
|
{ 43, "elapsed_time" },
|
|
{ 44, "data_checksum" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
|
|
{
|
|
uint8_t optlen, i;
|
|
|
|
ND_TCHECK(*option);
|
|
|
|
if (*option >= 32) {
|
|
ND_TCHECK(*(option+1));
|
|
optlen = *(option +1);
|
|
if (optlen < 2) {
|
|
if (*option >= 128)
|
|
ND_PRINT((ndo, "CCID option %u optlen too short", *option));
|
|
else
|
|
ND_PRINT((ndo, "%s optlen too short",
|
|
tok2str(dccp_option_values, "Option %u", *option)));
|
|
return 0;
|
|
}
|
|
} else
|
|
optlen = 1;
|
|
|
|
if (hlen < optlen) {
|
|
if (*option >= 128)
|
|
ND_PRINT((ndo, "CCID option %u optlen goes past header length",
|
|
*option));
|
|
else
|
|
ND_PRINT((ndo, "%s optlen goes past header length",
|
|
tok2str(dccp_option_values, "Option %u", *option)));
|
|
return 0;
|
|
}
|
|
ND_TCHECK2(*option, optlen);
|
|
|
|
if (*option >= 128) {
|
|
ND_PRINT((ndo, "CCID option %d", *option));
|
|
switch (optlen) {
|
|
case 4:
|
|
ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
|
|
break;
|
|
case 6:
|
|
ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
} else {
|
|
ND_PRINT((ndo, "%s", tok2str(dccp_option_values, "Option %u", *option)));
|
|
switch (*option) {
|
|
case 32:
|
|
case 33:
|
|
case 34:
|
|
case 35:
|
|
if (optlen < 3) {
|
|
ND_PRINT((ndo, " optlen too short"));
|
|
return optlen;
|
|
}
|
|
if (*(option + 2) < 10){
|
|
ND_PRINT((ndo, " %s", dccp_feature_nums[*(option + 2)]));
|
|
for (i = 0; i < optlen - 3; i++)
|
|
ND_PRINT((ndo, " %d", *(option + 3 + i)));
|
|
}
|
|
break;
|
|
case 36:
|
|
if (optlen > 2) {
|
|
ND_PRINT((ndo, " 0x"));
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT((ndo, "%02x", *(option + 2 + i)));
|
|
}
|
|
break;
|
|
case 37:
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT((ndo, " %d", *(option + 2 + i)));
|
|
break;
|
|
case 38:
|
|
if (optlen > 2) {
|
|
ND_PRINT((ndo, " 0x"));
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT((ndo, "%02x", *(option + 2 + i)));
|
|
}
|
|
break;
|
|
case 39:
|
|
if (optlen > 2) {
|
|
ND_PRINT((ndo, " 0x"));
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT((ndo, "%02x", *(option + 2 + i)));
|
|
}
|
|
break;
|
|
case 40:
|
|
if (optlen > 2) {
|
|
ND_PRINT((ndo, " 0x"));
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT((ndo, "%02x", *(option + 2 + i)));
|
|
}
|
|
break;
|
|
case 41:
|
|
if (optlen == 4)
|
|
ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
|
|
else
|
|
ND_PRINT((ndo, " optlen != 4"));
|
|
break;
|
|
case 42:
|
|
if (optlen == 4)
|
|
ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
|
|
else
|
|
ND_PRINT((ndo, " optlen != 4"));
|
|
break;
|
|
case 43:
|
|
if (optlen == 6)
|
|
ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
|
|
else if (optlen == 4)
|
|
ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
|
|
else
|
|
ND_PRINT((ndo, " optlen != 4 or 6"));
|
|
break;
|
|
case 44:
|
|
if (optlen > 2) {
|
|
ND_PRINT((ndo, " "));
|
|
for (i = 0; i < optlen - 2; i++)
|
|
ND_PRINT((ndo, "%02x", *(option + 2 + i)));
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return optlen;
|
|
trunc:
|
|
ND_PRINT((ndo, "%s", tstr));
|
|
return 0;
|
|
}
|