465 lines
10 KiB
C
465 lines
10 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] _U_ =
|
|
"@(#) $Header: /tcpdump/master/tcpdump/print-dccp.c,v 1.8 2007-11-09 00:44:09 guy Exp $ (LBL)";
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <tcpdump-stdinc.h>
|
|
|
|
#include "dccp.h"
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
#include "extract.h" /* must come after interface.h */
|
|
#include "ip.h"
|
|
#ifdef INET6
|
|
#include "ip6.h"
|
|
#endif
|
|
#include "ipproto.h"
|
|
|
|
static const char *dccp_reset_codes[] = {
|
|
"unspecified",
|
|
"closed",
|
|
"aborted",
|
|
"no_connection",
|
|
"packet_error",
|
|
"option_error",
|
|
"mandatory_error",
|
|
"connection_refused",
|
|
"bad_service_code",
|
|
"too_busy",
|
|
"bad_init_cookie",
|
|
"aggression_penalty",
|
|
};
|
|
|
|
static const char *dccp_feature_nums[] = {
|
|
"reserved",
|
|
"ccid",
|
|
"allow_short_seqno",
|
|
"sequence_window",
|
|
"ecn_incapable",
|
|
"ack_ratio",
|
|
"send_ack_vector",
|
|
"send_ndp_count",
|
|
"minimum checksum coverage",
|
|
"check data checksum",
|
|
};
|
|
|
|
static inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
|
|
{
|
|
u_int cov;
|
|
|
|
if (DCCPH_CSCOV(dh) == 0)
|
|
return len;
|
|
cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(u_int32_t);
|
|
return (cov > len)? len : cov;
|
|
}
|
|
|
|
static int dccp_cksum(const struct ip *ip,
|
|
const struct dccp_hdr *dh, u_int len)
|
|
{
|
|
return nextproto4_cksum(ip, (const u_int8_t *)(void *)dh,
|
|
dccp_csum_coverage(dh, len), IPPROTO_DCCP);
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
|
|
{
|
|
return nextproto6_cksum(ip6, (const u_int8_t *)(void *)dh,
|
|
dccp_csum_coverage(dh, len), IPPROTO_DCCP);
|
|
}
|
|
#endif
|
|
|
|
static const char *dccp_reset_code(u_int8_t code)
|
|
{
|
|
if (code >= __DCCP_RESET_CODE_LAST)
|
|
return "invalid";
|
|
return dccp_reset_codes[code];
|
|
}
|
|
|
|
static u_int64_t dccp_seqno(const struct dccp_hdr *dh)
|
|
{
|
|
u_int32_t seq_high = DCCPH_SEQ(dh);
|
|
u_int64_t seqno = EXTRACT_24BITS(&seq_high) & 0xFFFFFF;
|
|
|
|
if (DCCPH_X(dh) != 0) {
|
|
const struct dccp_hdr_ext *dhx = (void *)(dh + 1);
|
|
u_int32_t seq_low = dhx->dccph_seq_low;
|
|
seqno &= 0x00FFFF; /* clear reserved field */
|
|
seqno = (seqno << 32) + EXTRACT_32BITS(&seq_low);
|
|
}
|
|
|
|
return seqno;
|
|
}
|
|
|
|
static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
|
|
{
|
|
return sizeof(*dh) + (DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : 0);
|
|
}
|
|
|
|
static void dccp_print_ack_no(const u_char *bp)
|
|
{
|
|
const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
|
|
const struct dccp_hdr_ack_bits *dh_ack =
|
|
(struct dccp_hdr_ack_bits *)(bp + dccp_basic_hdr_len(dh));
|
|
u_int32_t ack_high;
|
|
u_int64_t ackno;
|
|
|
|
TCHECK2(*dh_ack,4);
|
|
ack_high = DCCPH_ACK(dh_ack);
|
|
ackno = EXTRACT_24BITS(&ack_high) & 0xFFFFFF;
|
|
|
|
if (DCCPH_X(dh) != 0) {
|
|
u_int32_t ack_low;
|
|
|
|
TCHECK2(*dh_ack,8);
|
|
ack_low = dh_ack->dccph_ack_nr_low;
|
|
|
|
ackno &= 0x00FFFF; /* clear reserved field */
|
|
ackno = (ackno << 32) + EXTRACT_32BITS(&ack_low);
|
|
}
|
|
|
|
(void)printf("(ack=%" PRIu64 ") ", ackno);
|
|
trunc:
|
|
return;
|
|
}
|
|
|
|
static inline unsigned int dccp_packet_hdr_len(const u_int8_t type)
|
|
{
|
|
if (type == DCCP_PKT_DATA)
|
|
return 0;
|
|
if (type == DCCP_PKT_DATAACK ||
|
|
type == DCCP_PKT_ACK ||
|
|
type == DCCP_PKT_SYNC ||
|
|
type == DCCP_PKT_SYNCACK ||
|
|
type == DCCP_PKT_CLOSE ||
|
|
type == DCCP_PKT_CLOSEREQ)
|
|
return sizeof(struct dccp_hdr_ack_bits);
|
|
if (type == DCCP_PKT_REQUEST)
|
|
return sizeof(struct dccp_hdr_request);
|
|
if (type == DCCP_PKT_RESPONSE)
|
|
return sizeof(struct dccp_hdr_response);
|
|
return sizeof(struct dccp_hdr_reset);
|
|
}
|
|
|
|
static int dccp_print_option(const u_char *option);
|
|
|
|
/**
|
|
* dccp_print - show dccp packet
|
|
* @bp - beginning of dccp packet
|
|
* @data2 - beginning of enclosing
|
|
* @len - lenght of ip packet
|
|
*/
|
|
void dccp_print(const u_char *bp, const u_char *data2, u_int len)
|
|
{
|
|
const struct dccp_hdr *dh;
|
|
const struct ip *ip;
|
|
#ifdef INET6
|
|
const struct ip6_hdr *ip6;
|
|
#endif
|
|
const u_char *cp;
|
|
u_short sport, dport;
|
|
u_int hlen;
|
|
u_int extlen = 0;
|
|
|
|
dh = (const struct dccp_hdr *)bp;
|
|
|
|
ip = (struct ip *)data2;
|
|
#ifdef INET6
|
|
if (IP_V(ip) == 6)
|
|
ip6 = (const struct ip6_hdr *)data2;
|
|
else
|
|
ip6 = NULL;
|
|
#endif /*INET6*/
|
|
cp = (const u_char *)(dh + 1);
|
|
if (cp > snapend) {
|
|
printf("[Invalid packet|dccp]");
|
|
return;
|
|
}
|
|
|
|
if (len < sizeof(struct dccp_hdr)) {
|
|
printf("truncated-dccp - %ld bytes missing!",
|
|
(long)len - sizeof(struct dccp_hdr));
|
|
return;
|
|
}
|
|
|
|
sport = EXTRACT_16BITS(&dh->dccph_sport);
|
|
dport = EXTRACT_16BITS(&dh->dccph_dport);
|
|
hlen = dh->dccph_doff * 4;
|
|
|
|
#ifdef INET6
|
|
if (ip6) {
|
|
(void)printf("%s.%d > %s.%d: ",
|
|
ip6addr_string(&ip6->ip6_src), sport,
|
|
ip6addr_string(&ip6->ip6_dst), dport);
|
|
} else
|
|
#endif /*INET6*/
|
|
{
|
|
(void)printf("%s.%d > %s.%d: ",
|
|
ipaddr_string(&ip->ip_src), sport,
|
|
ipaddr_string(&ip->ip_dst), dport);
|
|
}
|
|
fflush(stdout);
|
|
|
|
if (qflag) {
|
|
(void)printf(" %d", len - hlen);
|
|
if (hlen > len) {
|
|
(void)printf("dccp [bad hdr length %u - too long, > %u]",
|
|
hlen, len);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* other variables in generic header */
|
|
if (vflag) {
|
|
(void)printf("CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh));
|
|
}
|
|
|
|
/* checksum calculation */
|
|
if (vflag && TTEST2(bp[0], len)) {
|
|
u_int16_t sum = 0, dccp_sum;
|
|
|
|
dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
|
|
(void)printf("cksum 0x%04x ", dccp_sum);
|
|
if (IP_V(ip) == 4)
|
|
sum = dccp_cksum(ip, dh, len);
|
|
#ifdef INET6
|
|
else if (IP_V(ip) == 6)
|
|
sum = dccp6_cksum(ip6, dh, len);
|
|
#endif
|
|
if (sum != 0)
|
|
(void)printf("(incorrect -> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum));
|
|
else
|
|
(void)printf("(correct), ");
|
|
}
|
|
|
|
switch (DCCPH_TYPE(dh)) {
|
|
case DCCP_PKT_REQUEST: {
|
|
struct dccp_hdr_request *dhr =
|
|
(struct dccp_hdr_request *)(bp + dccp_basic_hdr_len(dh));
|
|
TCHECK(*dhr);
|
|
(void)printf("request (service=%d) ",
|
|
EXTRACT_32BITS(&dhr->dccph_req_service));
|
|
extlen += 4;
|
|
break;
|
|
}
|
|
case DCCP_PKT_RESPONSE: {
|
|
struct dccp_hdr_response *dhr =
|
|
(struct dccp_hdr_response *)(bp + dccp_basic_hdr_len(dh));
|
|
TCHECK(*dhr);
|
|
(void)printf("response (service=%d) ",
|
|
EXTRACT_32BITS(&dhr->dccph_resp_service));
|
|
extlen += 12;
|
|
break;
|
|
}
|
|
case DCCP_PKT_DATA:
|
|
(void)printf("data ");
|
|
break;
|
|
case DCCP_PKT_ACK: {
|
|
(void)printf("ack ");
|
|
extlen += 8;
|
|
break;
|
|
}
|
|
case DCCP_PKT_DATAACK: {
|
|
(void)printf("dataack ");
|
|
extlen += 8;
|
|
break;
|
|
}
|
|
case DCCP_PKT_CLOSEREQ:
|
|
(void)printf("closereq ");
|
|
extlen += 8;
|
|
break;
|
|
case DCCP_PKT_CLOSE:
|
|
(void)printf("close ");
|
|
extlen += 8;
|
|
break;
|
|
case DCCP_PKT_RESET: {
|
|
struct dccp_hdr_reset *dhr =
|
|
(struct dccp_hdr_reset *)(bp + dccp_basic_hdr_len(dh));
|
|
TCHECK(*dhr);
|
|
(void)printf("reset (code=%s) ",
|
|
dccp_reset_code(dhr->dccph_reset_code));
|
|
extlen += 12;
|
|
break;
|
|
}
|
|
case DCCP_PKT_SYNC:
|
|
(void)printf("sync ");
|
|
extlen += 8;
|
|
break;
|
|
case DCCP_PKT_SYNCACK:
|
|
(void)printf("syncack ");
|
|
extlen += 8;
|
|
break;
|
|
default:
|
|
(void)printf("invalid ");
|
|
break;
|
|
}
|
|
|
|
if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
|
|
(DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
|
|
dccp_print_ack_no(bp);
|
|
|
|
if (vflag < 2)
|
|
return;
|
|
|
|
(void)printf("seq %" PRIu64, dccp_seqno(dh));
|
|
|
|
/* process options */
|
|
if (hlen > dccp_basic_hdr_len(dh) + extlen){
|
|
const u_char *cp;
|
|
u_int optlen;
|
|
cp = bp + dccp_basic_hdr_len(dh) + extlen;
|
|
printf(" <");
|
|
|
|
hlen -= dccp_basic_hdr_len(dh) + extlen;
|
|
while(1){
|
|
TCHECK(*cp);
|
|
optlen = dccp_print_option(cp);
|
|
if (!optlen) goto trunc2;
|
|
if (hlen <= optlen) break;
|
|
hlen -= optlen;
|
|
cp += optlen;
|
|
printf(", ");
|
|
}
|
|
printf(">");
|
|
}
|
|
return;
|
|
trunc:
|
|
printf("[|dccp]");
|
|
trunc2:
|
|
return;
|
|
}
|
|
|
|
static int dccp_print_option(const u_char *option)
|
|
{
|
|
u_int8_t optlen, i;
|
|
|
|
TCHECK(*option);
|
|
|
|
if (*option >= 32) {
|
|
TCHECK(*(option+1));
|
|
optlen = *(option +1);
|
|
if (optlen < 2) {
|
|
printf("Option %d optlen too short",*option);
|
|
return 1;
|
|
}
|
|
} else optlen = 1;
|
|
|
|
TCHECK2(*option,optlen);
|
|
|
|
switch (*option){
|
|
case 0:
|
|
printf("nop");
|
|
break;
|
|
case 1:
|
|
printf("mandatory");
|
|
break;
|
|
case 2:
|
|
printf("slowreceiver");
|
|
break;
|
|
case 32:
|
|
printf("change_l");
|
|
if (*(option +2) < 10){
|
|
printf(" %s", dccp_feature_nums[*(option +2)]);
|
|
for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
|
|
}
|
|
break;
|
|
case 33:
|
|
printf("confirm_l");
|
|
if (*(option +2) < 10){
|
|
printf(" %s", dccp_feature_nums[*(option +2)]);
|
|
for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
|
|
}
|
|
break;
|
|
case 34:
|
|
printf("change_r");
|
|
if (*(option +2) < 10){
|
|
printf(" %s", dccp_feature_nums[*(option +2)]);
|
|
for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
|
|
}
|
|
break;
|
|
case 35:
|
|
printf("confirm_r");
|
|
if (*(option +2) < 10){
|
|
printf(" %s", dccp_feature_nums[*(option +2)]);
|
|
for (i = 0; i < optlen -3; i ++) printf(" %d", *(option +3 + i));
|
|
}
|
|
break;
|
|
case 36:
|
|
printf("initcookie 0x");
|
|
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
|
|
break;
|
|
case 37:
|
|
printf("ndp_count");
|
|
for (i = 0; i < optlen -2; i ++) printf(" %d", *(option +2 + i));
|
|
break;
|
|
case 38:
|
|
printf("ack_vector0 0x");
|
|
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
|
|
break;
|
|
case 39:
|
|
printf("ack_vector1 0x");
|
|
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
|
|
break;
|
|
case 40:
|
|
printf("data_dropped 0x");
|
|
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
|
|
break;
|
|
case 41:
|
|
printf("timestamp %u", EXTRACT_32BITS(option + 2));
|
|
break;
|
|
case 42:
|
|
printf("timestamp_echo %u", EXTRACT_32BITS(option + 2));
|
|
break;
|
|
case 43:
|
|
printf("elapsed_time ");
|
|
if (optlen == 6)
|
|
printf("%u", EXTRACT_32BITS(option + 2));
|
|
else
|
|
printf("%u", EXTRACT_16BITS(option + 2));
|
|
break;
|
|
case 44:
|
|
printf("data_checksum ");
|
|
for (i = 0; i < optlen -2; i ++) printf("%02x", *(option +2 + i));
|
|
break;
|
|
default :
|
|
if (*option >= 128) {
|
|
printf("CCID option %d",*option);
|
|
switch (optlen) {
|
|
case 4:
|
|
printf(" %u", EXTRACT_16BITS(option + 2));
|
|
break;
|
|
case 6:
|
|
printf(" %u", EXTRACT_32BITS(option + 2));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
printf("unknown_opt %d", *option);
|
|
break;
|
|
}
|
|
|
|
return optlen;
|
|
trunc:
|
|
printf("[|dccp]");
|
|
return 0;
|
|
}
|