/**
* 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 len)
{
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;
/* make sure we have enough data to look at the X bit */
cp = (const u_char *)(dh + 1);
if (cp > ndo->ndo_snapend)
goto trunc;
if (len < sizeof(struct dccp_hdr)) {
ND_PRINT("truncated-dccp - %u bytes missing!",
(u_int)sizeof(struct dccp_hdr) - len);
return;
}
/* get the length of the generic header */
fixed_hdrlen = dccp_basic_hdr_len(ndo, dh);
if (len < fixed_hdrlen) {
ND_PRINT("truncated-dccp - %u bytes missing!",
fixed_hdrlen - len);
return;
}
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: ",
ip6addr_string(ndo, ip6->ip6_src), sport,
ip6addr_string(ndo, ip6->ip6_dst), dport);
} else {
ND_PRINT("%s.%u > %s.%u: ",
ipaddr_string(ndo, ip->ip_src), sport,
ipaddr_string(ndo, ip->ip_dst), dport);
}
ND_PRINT("DCCP");
if (ndo->ndo_qflag) {
ND_PRINT(" %u", len - hlen);
if (hlen > len) {
ND_PRINT(" [bad hdr length %u - too long, > %u]",
hlen, len);
}
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 (ndo->ndo_vflag && ND_TTEST_LEN(bp, len)) {
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, len);
else if (IP_V(ip) == 6)
sum = dccp6_cksum(ndo, ip6, dh, len);
if (sum != 0)
ND_PRINT("(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum));
else
ND_PRINT("(correct)");
}
if (ndo->ndo_vflag)
ND_PRINT(")");
ND_PRINT(" ");
dccph_type = DCCPH_TYPE(dh);
switch (dccph_type) {
case DCCP_PKT_REQUEST: {
const struct dccp_hdr_request *dhr =
(const struct dccp_hdr_request *)(bp + fixed_hdrlen);
fixed_hdrlen += 4;
if (len < fixed_hdrlen) {
ND_PRINT("truncated-%s - %u bytes missing!",
tok2str(dccp_pkt_type_str, "", dccph_type),
fixed_hdrlen - len);
return;
}
ND_TCHECK_SIZE(dhr);
ND_PRINT("%s (service=%u) ",
tok2str(dccp_pkt_type_str, "", dccph_type),
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;
if (len < fixed_hdrlen) {
ND_PRINT("truncated-%s - %u bytes missing!",
tok2str(dccp_pkt_type_str, "", dccph_type),
fixed_hdrlen - len);
return;
}
ND_TCHECK_SIZE(dhr);
ND_PRINT("%s (service=%u) ",
tok2str(dccp_pkt_type_str, "", dccph_type),
GET_BE_U_4(dhr->dccph_resp_service));
break;
}
case DCCP_PKT_DATA:
ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
break;
case DCCP_PKT_ACK: {
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT("truncated-%s - %u bytes missing!",
tok2str(dccp_pkt_type_str, "", dccph_type),
fixed_hdrlen - len);
return;
}
ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
break;
}
case DCCP_PKT_DATAACK: {
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT("truncated-%s - %u bytes missing!",
tok2str(dccp_pkt_type_str, "", dccph_type),
fixed_hdrlen - len);
return;
}
ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
break;
}
case DCCP_PKT_CLOSEREQ:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT("truncated-%s - %u bytes missing!",
tok2str(dccp_pkt_type_str, "", dccph_type),
fixed_hdrlen - len);
return;
}
ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
break;
case DCCP_PKT_CLOSE:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT("truncated-%s - %u bytes missing!",
tok2str(dccp_pkt_type_str, "", dccph_type),
fixed_hdrlen - len);
return;
}
ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
break;
case DCCP_PKT_RESET: {
const struct dccp_hdr_reset *dhr =
(const struct dccp_hdr_reset *)(bp + fixed_hdrlen);
fixed_hdrlen += 12;
if (len < fixed_hdrlen) {
ND_PRINT("truncated-%s - %u bytes missing!",
tok2str(dccp_pkt_type_str, "", dccph_type),
fixed_hdrlen - len);
return;
}
ND_TCHECK_SIZE(dhr);
ND_PRINT("%s (code=%s) ",
tok2str(dccp_pkt_type_str, "", dccph_type),
dccp_reset_code(GET_U_1(dhr->dccph_reset_code)));
break;
}
case DCCP_PKT_SYNC:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT("truncated-%s - %u bytes missing!",
tok2str(dccp_pkt_type_str, "", dccph_type),
fixed_hdrlen - len);
return;
}
ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
break;
case DCCP_PKT_SYNCACK:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT("truncated-%s - %u bytes missing!",
tok2str(dccp_pkt_type_str, "", dccph_type),
fixed_hdrlen - len);
return;
}
ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "", dccph_type));
break;
default:
ND_PRINT("%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type));
break;
}
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)
break;
if (hlen <= optlen)
break;
hlen -= optlen;
cp += optlen;
ND_PRINT(", ");
}
ND_PRINT(">");
}
return;
trunc:
nd_print_trunc(ndo);
return;
}
/**
* dccp_print - show dccp packet
* @bp - beginning of dccp packet
* @data2 - beginning of enclosing
* @len - lenght of ip packet
*/
void dccp_print(netdissect_options *ndo, 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 fixed_hdrlen;
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*/
/* make sure we have enough data to look at the X bit */
cp = (const u_char *)(dh + 1);
if (cp > ndo->ndo_snapend) {
ND_PRINT((ndo, "[Invalid packet|dccp]"));
return;
}
if (len < sizeof(struct dccp_hdr)) {
ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
len - (u_int)sizeof(struct dccp_hdr)));
return;
}
/* get the length of the generic header */
fixed_hdrlen = dccp_basic_hdr_len(dh);
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
len - fixed_hdrlen));
return;
}
ND_TCHECK2(*dh, fixed_hdrlen);
sport = EXTRACT_16BITS(&dh->dccph_sport);
dport = EXTRACT_16BITS(&dh->dccph_dport);
hlen = dh->dccph_doff * 4;
#ifdef INET6
if (ip6) {
ND_PRINT((ndo, "%s.%d > %s.%d: ",
ip6addr_string(ndo, &ip6->ip6_src), sport,
ip6addr_string(ndo, &ip6->ip6_dst), dport));
} else
#endif /*INET6*/
{
ND_PRINT((ndo, "%s.%d > %s.%d: ",
ipaddr_string(ndo, &ip->ip_src), sport,
ipaddr_string(ndo, &ip->ip_dst), dport));
}
if (ndo->ndo_qflag) {
ND_PRINT((ndo, " %d", len - hlen));
if (hlen > len) {
ND_PRINT((ndo, "dccp [bad hdr length %u - too long, > %u]",
hlen, len));
}
return;
}
/* other variables in generic header */
if (ndo->ndo_vflag) {
ND_PRINT((ndo, "CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh)));
}
/* checksum calculation */
if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
u_int16_t sum = 0, dccp_sum;
dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
ND_PRINT((ndo, "cksum 0x%04x ", dccp_sum));
if (IP_V(ip) == 4)
sum = dccp_cksum(ndo, ip, dh, len);
#ifdef INET6
else if (IP_V(ip) == 6)
sum = dccp6_cksum(ip6, dh, len);
#endif
if (sum != 0)
ND_PRINT((ndo, "(incorrect -> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum)));
else
ND_PRINT((ndo, "(correct), "));
}
switch (DCCPH_TYPE(dh)) {
case DCCP_PKT_REQUEST: {
struct dccp_hdr_request *dhr =
(struct dccp_hdr_request *)(bp + fixed_hdrlen);
fixed_hdrlen += 4;
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp request - %u bytes missing!",
len - fixed_hdrlen));
return;
}
ND_TCHECK(*dhr);
ND_PRINT((ndo, "request (service=%d) ",
EXTRACT_32BITS(&dhr->dccph_req_service)));
break;
}
case DCCP_PKT_RESPONSE: {
struct dccp_hdr_response *dhr =
(struct dccp_hdr_response *)(bp + fixed_hdrlen);
fixed_hdrlen += 12;
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp response - %u bytes missing!",
len - fixed_hdrlen));
return;
}
ND_TCHECK(*dhr);
ND_PRINT((ndo, "response (service=%d) ",
EXTRACT_32BITS(&dhr->dccph_resp_service)));
break;
}
case DCCP_PKT_DATA:
ND_PRINT((ndo, "data "));
break;
case DCCP_PKT_ACK: {
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp ack - %u bytes missing!",
len - fixed_hdrlen));
return;
}
ND_PRINT((ndo, "ack "));
break;
}
case DCCP_PKT_DATAACK: {
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp dataack - %u bytes missing!",
len - fixed_hdrlen));
return;
}
ND_PRINT((ndo, "dataack "));
break;
}
case DCCP_PKT_CLOSEREQ:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp closereq - %u bytes missing!",
len - fixed_hdrlen));
return;
}
ND_PRINT((ndo, "closereq "));
break;
case DCCP_PKT_CLOSE:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp close - %u bytes missing!",
len - fixed_hdrlen));
return;
}
ND_PRINT((ndo, "close "));
break;
case DCCP_PKT_RESET: {
struct dccp_hdr_reset *dhr =
(struct dccp_hdr_reset *)(bp + fixed_hdrlen);
fixed_hdrlen += 12;
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp reset - %u bytes missing!",
len - fixed_hdrlen));
return;
}
ND_TCHECK(*dhr);
ND_PRINT((ndo, "reset (code=%s) ",
dccp_reset_code(dhr->dccph_reset_code)));
break;
}
case DCCP_PKT_SYNC:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp sync - %u bytes missing!",
len - fixed_hdrlen));
return;
}
ND_PRINT((ndo, "sync "));
break;
case DCCP_PKT_SYNCACK:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp syncack - %u bytes missing!",
len - fixed_hdrlen));
return;
}
ND_PRINT((ndo, "syncack "));
break;
default:
ND_PRINT((ndo, "invalid "));
break;
}
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((ndo, "seq %" PRIu64, dccp_seqno(bp)));
/* process options */
if (hlen > fixed_hdrlen){
const u_char *cp;
u_int optlen;
cp = bp + fixed_hdrlen;
ND_PRINT((ndo, " <"));
hlen -= fixed_hdrlen;
while(1){
optlen = dccp_print_option(ndo, cp, hlen);
if (!optlen)
break;
if (hlen <= optlen)
break;
hlen -= optlen;
cp += optlen;
ND_PRINT((ndo, ", "));
}
ND_PRINT((ndo, ">"));
}
return;
trunc:
ND_PRINT((ndo, "%s", tstr));
return;
}
/**
* 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("%s", tstr);
trunc2:
return;
}