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tcpdump/print-dccp.c
Francois-Xavier Le Bail 94a3708f00 Include <config.h> unconditionally 
Builds using Autotools or CMake generate config.h, thus remove the
'#ifdef HAVE_CONFIG_H'/'#endif'.

Remove also the 'add_definitions(-DHAVE_CONFIG_H)' in CMakeLists.txt.
2024-03-28 05:34:34 +00:00

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/*
* Copyright (C) Arnaldo Carvalho de Melo 2004
* Copyright (C) Ian McDonald 2005
* Copyright (C) Yoshifumi Nishida 2005
*
* This software may be distributed either under the terms of the
* BSD-style license that accompanies tcpdump or the GNU GPL version 2
*/
/* \summary: Datagram Congestion Control Protocol (DCCP) printer */
/* specification: RFC 4340 */
#include <config.h>
#include "netdissect-stdinc.h"
#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "ip.h"
#include "ip6.h"
#include "ipproto.h"
/* RFC4340: Datagram Congestion Control Protocol (DCCP) */
/**
* struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
* sequence number
*
* @dccph_sport - Relevant port on the endpoint that sent this packet
* @dccph_dport - Relevant port on the other endpoint
* @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
* @dccph_ccval - Used by the HC-Sender CCID
* @dccph_cscov - Parts of the packet that are covered by the Checksum field
* @dccph_checksum - Internet checksum, depends on dccph_cscov
* @dccph_x - 0 = 24 bit sequence number, 1 = 48
* @dccph_type - packet type, see DCCP_PKT_ prefixed macros
* @dccph_seq - 24-bit sequence number
*/
struct dccp_hdr {
nd_uint16_t dccph_sport,
dccph_dport;
nd_uint8_t dccph_doff;
nd_uint8_t dccph_ccval_cscov;
nd_uint16_t dccph_checksum;
nd_uint8_t dccph_xtr;
nd_uint24_t dccph_seq;
};
/**
* struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
* sequence number
*
* @dccph_sport - Relevant port on the endpoint that sent this packet
* @dccph_dport - Relevant port on the other endpoint
* @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
* @dccph_ccval - Used by the HC-Sender CCID
* @dccph_cscov - Parts of the packet that are covered by the Checksum field
* @dccph_checksum - Internet checksum, depends on dccph_cscov
* @dccph_x - 0 = 24 bit sequence number, 1 = 48
* @dccph_type - packet type, see DCCP_PKT_ prefixed macros
* @dccph_seq - 48-bit sequence number
*/
struct dccp_hdr_ext {
nd_uint16_t dccph_sport,
dccph_dport;
nd_uint8_t dccph_doff;
nd_uint8_t dccph_ccval_cscov;
nd_uint16_t dccph_checksum;
nd_uint8_t dccph_xtr;
nd_uint8_t reserved;
nd_uint48_t dccph_seq;
};
#define DCCPH_CCVAL(dh) ((GET_U_1((dh)->dccph_ccval_cscov) >> 4) & 0xF)
#define DCCPH_CSCOV(dh) (GET_U_1((dh)->dccph_ccval_cscov) & 0xF)
#define DCCPH_X(dh) (GET_U_1((dh)->dccph_xtr) & 1)
#define DCCPH_TYPE(dh) ((GET_U_1((dh)->dccph_xtr) >> 1) & 0xF)
/**
* struct dccp_hdr_request - Connection initiation request header
*
* @dccph_req_service - Service to which the client app wants to connect
*/
struct dccp_hdr_request {
nd_uint32_t dccph_req_service;
};
/**
* struct dccp_hdr_response - Connection initiation response header
*
* @dccph_resp_ack - 48 bit ack number, contains GSR
* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
*/
struct dccp_hdr_response {
nd_uint64_t dccph_resp_ack; /* always 8 bytes, first 2 reserved */
nd_uint32_t dccph_resp_service;
};
/**
* struct dccp_hdr_reset - Unconditionally shut down a connection
*
* @dccph_resp_ack - 48 bit ack number
* @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
*/
struct dccp_hdr_reset {
nd_uint64_t dccph_reset_ack; /* always 8 bytes, first 2 reserved */
nd_uint8_t dccph_reset_code;
nd_uint8_t dccph_reset_data1;
nd_uint8_t dccph_reset_data2;
nd_uint8_t dccph_reset_data3;
};
enum dccp_pkt_type {
DCCP_PKT_REQUEST = 0,
DCCP_PKT_RESPONSE,
DCCP_PKT_DATA,
DCCP_PKT_ACK,
DCCP_PKT_DATAACK,
DCCP_PKT_CLOSEREQ,
DCCP_PKT_CLOSE,
DCCP_PKT_RESET,
DCCP_PKT_SYNC,
DCCP_PKT_SYNCACK
};
static const struct tok dccp_pkt_type_str[] = {
{ DCCP_PKT_REQUEST, "DCCP-Request" },
{ DCCP_PKT_RESPONSE, "DCCP-Response" },
{ DCCP_PKT_DATA, "DCCP-Data" },
{ DCCP_PKT_ACK, "DCCP-Ack" },
{ DCCP_PKT_DATAACK, "DCCP-DataAck" },
{ DCCP_PKT_CLOSEREQ, "DCCP-CloseReq" },
{ DCCP_PKT_CLOSE, "DCCP-Close" },
{ DCCP_PKT_RESET, "DCCP-Reset" },
{ DCCP_PKT_SYNC, "DCCP-Sync" },
{ DCCP_PKT_SYNCACK, "DCCP-SyncAck" },
{ 0, NULL}
};
enum dccp_reset_codes {
DCCP_RESET_CODE_UNSPECIFIED = 0,
DCCP_RESET_CODE_CLOSED,
DCCP_RESET_CODE_ABORTED,
DCCP_RESET_CODE_NO_CONNECTION,
DCCP_RESET_CODE_PACKET_ERROR,
DCCP_RESET_CODE_OPTION_ERROR,
DCCP_RESET_CODE_MANDATORY_ERROR,
DCCP_RESET_CODE_CONNECTION_REFUSED,
DCCP_RESET_CODE_BAD_SERVICE_CODE,
DCCP_RESET_CODE_TOO_BUSY,
DCCP_RESET_CODE_BAD_INIT_COOKIE,
DCCP_RESET_CODE_AGGRESSION_PENALTY,
};
static const struct tok dccp_reset_code_str[] = {
{ DCCP_RESET_CODE_UNSPECIFIED, "unspecified" },
{ DCCP_RESET_CODE_CLOSED, "closed" },
{ DCCP_RESET_CODE_ABORTED, "aborted" },
{ DCCP_RESET_CODE_NO_CONNECTION, "no_connection" },
{ DCCP_RESET_CODE_PACKET_ERROR, "packet_error" },
{ DCCP_RESET_CODE_OPTION_ERROR, "option_error" },
{ DCCP_RESET_CODE_MANDATORY_ERROR, "mandatory_error" },
{ DCCP_RESET_CODE_CONNECTION_REFUSED, "connection_refused" },
{ DCCP_RESET_CODE_BAD_SERVICE_CODE, "bad_service_code" },
{ DCCP_RESET_CODE_TOO_BUSY, "too_busy" },
{ DCCP_RESET_CODE_BAD_INIT_COOKIE, "bad_init_cookie" },
{ DCCP_RESET_CODE_AGGRESSION_PENALTY, "aggression_penalty" },
{ 0, NULL }
};
static const struct tok dccp_feature_num_str[] = {
{ 0, "reserved" },
{ 1, "ccid" },
{ 2, "allow_short_seqno" },
{ 3, "sequence_window" },
{ 4, "ecn_incapable" },
{ 5, "ack_ratio" },
{ 6, "send_ack_vector" },
{ 7, "send_ndp_count" },
{ 8, "minimum_checksum_coverage" },
{ 9, "check_data_checksum" },
{ 0, NULL }
};
static u_int
dccp_csum_coverage(netdissect_options *ndo,
const struct dccp_hdr *dh, u_int len)
{
u_int cov;
if (DCCPH_CSCOV(dh) == 0)
return len;
cov = (GET_U_1(dh->dccph_doff) + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
return (cov > len)? len : cov;
}
static uint16_t dccp_cksum(netdissect_options *ndo, const struct ip *ip,
const struct dccp_hdr *dh, u_int len)
{
return nextproto4_cksum(ndo, ip, (const uint8_t *)(const void *)dh, len,
dccp_csum_coverage(ndo, dh, len), IPPROTO_DCCP);
}
static uint16_t dccp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
const struct dccp_hdr *dh, u_int len)
{
return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)dh, len,
dccp_csum_coverage(ndo, dh, len), IPPROTO_DCCP);
}
static uint64_t
dccp_seqno(netdissect_options *ndo, const u_char *bp)
{
const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
uint64_t seqno;
if (DCCPH_X(dh) != 0) {
const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
seqno = GET_BE_U_6(dhx->dccph_seq);
} else {
seqno = GET_BE_U_3(dh->dccph_seq);
}
return seqno;
}
static unsigned int
dccp_basic_hdr_len(netdissect_options *ndo, const struct dccp_hdr *dh)
{
return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
}
static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
{
const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
const u_char *ackp = bp + dccp_basic_hdr_len(ndo, dh);
uint64_t ackno;
if (DCCPH_X(dh) != 0) {
ackno = GET_BE_U_6(ackp + 2);
} else {
ackno = GET_BE_U_3(ackp + 1);
}
ND_PRINT("(ack=%" PRIu64 ") ", ackno);
}
static u_int dccp_print_option(netdissect_options *, const u_char *, u_int);
/**
* dccp_print - show dccp packet
* @bp - beginning of dccp packet
* @data2 - beginning of enclosing
* @len - length of ip packet
*/
void
dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
u_int length)
{
const struct dccp_hdr *dh;
const struct ip *ip;
const struct ip6_hdr *ip6;
const u_char *cp;
u_short sport, dport;
u_int hlen;
u_int fixed_hdrlen;
uint8_t dccph_type;
ndo->ndo_protocol = "dccp";
dh = (const struct dccp_hdr *)bp;
ip = (const struct ip *)data2;
if (IP_V(ip) == 6)
ip6 = (const struct ip6_hdr *)data2;
else
ip6 = NULL;
cp = (const u_char *)(dh + 1);
ND_ICHECK_ZU(length, <, sizeof(struct dccp_hdr));
/* get the length of the generic header */
fixed_hdrlen = dccp_basic_hdr_len(ndo, dh);
ND_ICHECK_U(length, <, fixed_hdrlen);
ND_TCHECK_LEN(dh, fixed_hdrlen);
sport = GET_BE_U_2(dh->dccph_sport);
dport = GET_BE_U_2(dh->dccph_dport);
hlen = GET_U_1(dh->dccph_doff) * 4;
if (ip6) {
ND_PRINT("%s.%u > %s.%u: ",
GET_IP6ADDR_STRING(ip6->ip6_src), sport,
GET_IP6ADDR_STRING(ip6->ip6_dst), dport);
} else {
ND_PRINT("%s.%u > %s.%u: ",
GET_IPADDR_STRING(ip->ip_src), sport,
GET_IPADDR_STRING(ip->ip_dst), dport);
}
nd_print_protocol_caps(ndo);
if (ndo->ndo_qflag) {
ND_ICHECK_U(length, <, hlen);
ND_PRINT(" %u", length - hlen);
return;
}
/* other variables in generic header */
if (ndo->ndo_vflag) {
ND_PRINT(" (CCVal %u, CsCov %u", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh));
/* checksum calculation */
if (ND_TTEST_LEN(bp, length)) {
uint16_t sum = 0, dccp_sum;
dccp_sum = GET_BE_U_2(dh->dccph_checksum);
ND_PRINT(", cksum 0x%04x ", dccp_sum);
if (IP_V(ip) == 4)
sum = dccp_cksum(ndo, ip, dh, length);
else if (IP_V(ip) == 6)
sum = dccp6_cksum(ndo, ip6, dh, length);
if (sum != 0)
ND_PRINT("(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum));
else
ND_PRINT("(correct)");
}
ND_PRINT(")");
}
dccph_type = DCCPH_TYPE(dh);
ND_PRINT(" %s ", tok2str(dccp_pkt_type_str, "packet-type-%u",
dccph_type));
switch (dccph_type) {
case DCCP_PKT_REQUEST: {
const struct dccp_hdr_request *dhr =
(const struct dccp_hdr_request *)(bp + fixed_hdrlen);
fixed_hdrlen += 4;
ND_ICHECK_U(length, <, fixed_hdrlen);
ND_PRINT("(service=%u) ", GET_BE_U_4(dhr->dccph_req_service));
break;
}
case DCCP_PKT_RESPONSE: {
const struct dccp_hdr_response *dhr =
(const struct dccp_hdr_response *)(bp + fixed_hdrlen);
fixed_hdrlen += 12;
ND_ICHECK_U(length, <, fixed_hdrlen);
ND_PRINT("(service=%u) ", GET_BE_U_4(dhr->dccph_resp_service));
break;
}
case DCCP_PKT_DATA:
break;
case DCCP_PKT_ACK: {
fixed_hdrlen += 8;
ND_ICHECK_U(length, <, fixed_hdrlen);
break;
}
case DCCP_PKT_DATAACK: {
fixed_hdrlen += 8;
ND_ICHECK_U(length, <, fixed_hdrlen);
break;
}
case DCCP_PKT_CLOSEREQ:
fixed_hdrlen += 8;
ND_ICHECK_U(length, <, fixed_hdrlen);
break;
case DCCP_PKT_CLOSE:
fixed_hdrlen += 8;
ND_ICHECK_U(length, <, fixed_hdrlen);
break;
case DCCP_PKT_RESET: {
const struct dccp_hdr_reset *dhr =
(const struct dccp_hdr_reset *)(bp + fixed_hdrlen);
fixed_hdrlen += 12;
ND_ICHECK_U(length, <, fixed_hdrlen);
ND_TCHECK_SIZE(dhr);
ND_PRINT("(code=%s) ", tok2str(dccp_reset_code_str,
"reset-code-%u (invalid)", GET_U_1(dhr->dccph_reset_code)));
break;
}
case DCCP_PKT_SYNC:
fixed_hdrlen += 8;
ND_ICHECK_U(length, <, fixed_hdrlen);
break;
case DCCP_PKT_SYNCACK:
fixed_hdrlen += 8;
ND_ICHECK_U(length, <, fixed_hdrlen);
break;
default:
goto invalid;
}
if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
(DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
dccp_print_ack_no(ndo, bp);
if (ndo->ndo_vflag < 2)
return;
ND_PRINT("seq %" PRIu64, dccp_seqno(ndo, bp));
/* process options */
if (hlen > fixed_hdrlen){
u_int optlen;
cp = bp + fixed_hdrlen;
ND_PRINT(" <");
hlen -= fixed_hdrlen;
while(1){
optlen = dccp_print_option(ndo, cp, hlen);
if (!optlen)
goto invalid;
if (hlen <= optlen)
break;
hlen -= optlen;
cp += optlen;
ND_PRINT(", ");
}
ND_PRINT(">");
}
return;
invalid:
nd_print_invalid(ndo);
}
enum dccp_option_type {
DCCP_OPTION_PADDING = 0,
DCCP_OPTION_MANDATORY = 1,
DCCP_OPTION_SLOW_RECEIVER = 2,
DCCP_OPTION_CHANGE_L = 32,
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;
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;
}
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