* BSD-style license that accompanies tcpdump or the GNU GPL version 2
*/
+/* \summary: Datagram Congestion Control Protocol (DCCP) printer */
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
#include <stdio.h>
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
-#include "extract.h" /* must come after interface.h */
+#include "extract.h"
#include "ip.h"
-#ifdef INET6
#include "ip6.h"
-#endif
#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_seq - 24-bit sequence number
*/
struct dccp_hdr {
- u_int16_t dccph_sport,
+ uint16_t dccph_sport,
dccph_dport;
- u_int8_t dccph_doff;
- u_int8_t dccph_ccval_cscov;
- u_int16_t dccph_checksum;
- u_int8_t dccph_xtr;
- u_int8_t dccph_seq[3];
+ uint8_t dccph_doff;
+ uint8_t dccph_ccval_cscov;
+ uint16_t dccph_checksum;
+ uint8_t dccph_xtr;
+ uint8_t dccph_seq[3];
} UNALIGNED;
/**
* @dccph_seq - 48-bit sequence number
*/
struct dccp_hdr_ext {
- u_int16_t dccph_sport,
+ uint16_t dccph_sport,
dccph_dport;
- u_int8_t dccph_doff;
- u_int8_t dccph_ccval_cscov;
- u_int16_t dccph_checksum;
- u_int8_t dccph_xtr;
- u_int8_t reserved;
- u_int8_t dccph_seq[6];
+ uint8_t dccph_doff;
+ uint8_t dccph_ccval_cscov;
+ uint16_t dccph_checksum;
+ uint8_t dccph_xtr;
+ uint8_t reserved;
+ uint8_t dccph_seq[6];
} UNALIGNED;
#define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov >> 4) & 0xF)
* @dccph_req_service - Service to which the client app wants to connect
*/
struct dccp_hdr_request {
- u_int32_t dccph_req_service;
+ uint32_t dccph_req_service;
} UNALIGNED;
/**
* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
*/
struct dccp_hdr_response {
- u_int8_t dccph_resp_ack[8]; /* always 8 bytes */
- u_int32_t dccph_resp_service;
+ uint8_t dccph_resp_ack[8]; /* always 8 bytes */
+ uint32_t dccph_resp_service;
} UNALIGNED;
/**
* @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
*/
struct dccp_hdr_reset {
- u_int8_t dccph_reset_ack[8]; /* always 8 bytes */
- u_int8_t dccph_reset_code,
+ uint8_t dccph_reset_ack[8]; /* always 8 bytes */
+ uint8_t dccph_reset_code,
dccph_reset_data[3];
} UNALIGNED;
DCCP_PKT_CLOSE,
DCCP_PKT_RESET,
DCCP_PKT_SYNC,
- DCCP_PKT_SYNCACK,
- DCCP_PKT_INVALID
+ 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 {
if (DCCPH_CSCOV(dh) == 0)
return len;
- cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(u_int32_t);
+ cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
return (cov > len)? len : cov;
}
-static int dccp_cksum(const struct ip *ip,
+static int dccp_cksum(netdissect_options *ndo, const struct ip *ip,
const struct dccp_hdr *dh, u_int len)
{
- return nextproto4_cksum(ip, (const u_int8_t *)(void *)dh, len,
+ return nextproto4_cksum(ndo, ip, (const uint8_t *)(const void *)dh, len,
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)
+static int dccp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
+ const struct dccp_hdr *dh, u_int len)
{
- return nextproto6_cksum(ip6, (const u_int8_t *)(void *)dh, len,
+ return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)dh, len,
dccp_csum_coverage(dh, len), IPPROTO_DCCP);
}
-#endif
-static const char *dccp_reset_code(u_int8_t code)
+static const char *dccp_reset_code(uint8_t code)
{
if (code >= __DCCP_RESET_CODE_LAST)
return "invalid";
return dccp_reset_codes[code];
}
-static u_int64_t dccp_seqno(const u_char *bp)
+static uint64_t dccp_seqno(const u_char *bp)
{
const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
- u_int64_t seqno;
+ uint64_t seqno;
if (DCCPH_X(dh) != 0) {
const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
{
const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
const u_char *ackp = bp + dccp_basic_hdr_len(dh);
- u_int64_t ackno;
+ uint64_t ackno;
if (DCCPH_X(dh) != 0) {
ND_TCHECK2(*ackp, 8);
* @len - lenght of ip packet
*/
void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
- u_int len)
+ 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;
+ uint8_t dccph_type;
dh = (const struct dccp_hdr *)bp;
- ip = (struct ip *)data2;
-#ifdef INET6
+ ip = (const struct ip *)data2;
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 (len < sizeof(struct dccp_hdr)) {
ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
- len - (u_int)sizeof(struct dccp_hdr)));
+ len - (u_int)sizeof(struct dccp_hdr)));
return;
}
fixed_hdrlen = dccp_basic_hdr_len(dh);
if (len < fixed_hdrlen) {
ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
- len - fixed_hdrlen));
+ len - fixed_hdrlen));
return;
}
ND_TCHECK2(*dh, fixed_hdrlen);
dport = EXTRACT_16BITS(&dh->dccph_dport);
hlen = dh->dccph_doff * 4;
-#ifdef INET6
if (ip6) {
ND_PRINT((ndo, "%s.%d > %s.%d: ",
- ip6addr_string(&ip6->ip6_src), sport,
- ip6addr_string(&ip6->ip6_dst), dport));
- } else
-#endif /*INET6*/
- {
+ ip6addr_string(ndo, &ip6->ip6_src), sport,
+ ip6addr_string(ndo, &ip6->ip6_dst), dport));
+ } else {
ND_PRINT((ndo, "%s.%d > %s.%d: ",
- ipaddr_string(&ip->ip_src), sport,
- ipaddr_string(&ip->ip_dst), dport));
+ ipaddr_string(ndo, &ip->ip_src), sport,
+ ipaddr_string(ndo, &ip->ip_dst), dport));
}
- fflush(stdout);
+
+ ND_PRINT((ndo, "DCCP"));
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));
+ ND_PRINT((ndo, " [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)));
+ 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;
+ uint16_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(ip, dh, len);
-#ifdef INET6
+ sum = dccp_cksum(ndo, ip, dh, len);
else if (IP_V(ip) == 6)
- sum = dccp6_cksum(ip6, dh, len);
-#endif
+ sum = dccp6_cksum(ndo, ip6, dh, len);
if (sum != 0)
- ND_PRINT((ndo, "(incorrect -> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum)));
+ ND_PRINT((ndo, "(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum)));
else
- ND_PRINT((ndo, "(correct), "));
+ ND_PRINT((ndo, "(correct)"));
}
- switch (DCCPH_TYPE(dh)) {
+ if (ndo->ndo_vflag)
+ ND_PRINT((ndo, ")"));
+ ND_PRINT((ndo, " "));
+
+ dccph_type = DCCPH_TYPE(dh);
+ switch (dccph_type) {
case DCCP_PKT_REQUEST: {
- struct dccp_hdr_request *dhr =
- (struct dccp_hdr_request *)(bp + fixed_hdrlen);
+ const struct dccp_hdr_request *dhr =
+ (const 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));
+ ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ len - fixed_hdrlen));
return;
}
ND_TCHECK(*dhr);
- ND_PRINT((ndo, "request (service=%d) ",
- EXTRACT_32BITS(&dhr->dccph_req_service)));
+ ND_PRINT((ndo, "%s (service=%d) ",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ EXTRACT_32BITS(&dhr->dccph_req_service)));
break;
}
case DCCP_PKT_RESPONSE: {
- struct dccp_hdr_response *dhr =
- (struct dccp_hdr_response *)(bp + fixed_hdrlen);
+ const struct dccp_hdr_response *dhr =
+ (const 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));
+ ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ len - fixed_hdrlen));
return;
}
ND_TCHECK(*dhr);
- ND_PRINT((ndo, "response (service=%d) ",
- EXTRACT_32BITS(&dhr->dccph_resp_service)));
+ ND_PRINT((ndo, "%s (service=%d) ",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ EXTRACT_32BITS(&dhr->dccph_resp_service)));
break;
}
case DCCP_PKT_DATA:
- ND_PRINT((ndo, "data "));
+ ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
break;
case DCCP_PKT_ACK: {
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
- ND_PRINT((ndo, "truncated-dccp ack - %u bytes missing!",
- len - fixed_hdrlen));
+ ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ len - fixed_hdrlen));
return;
}
- ND_PRINT((ndo, "ack "));
+ ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
break;
}
case DCCP_PKT_DATAACK: {
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
- ND_PRINT((ndo, "truncated-dccp dataack - %u bytes missing!",
- len - fixed_hdrlen));
+ ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ len - fixed_hdrlen));
return;
}
- ND_PRINT((ndo, "dataack "));
+ ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
break;
}
case DCCP_PKT_CLOSEREQ:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
- ND_PRINT((ndo, "truncated-dccp closereq - %u bytes missing!",
- len - fixed_hdrlen));
+ ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ len - fixed_hdrlen));
return;
}
- ND_PRINT((ndo, "closereq "));
+ ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
break;
case DCCP_PKT_CLOSE:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
- ND_PRINT((ndo, "truncated-dccp close - %u bytes missing!",
- len - fixed_hdrlen));
+ ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ len - fixed_hdrlen));
return;
}
- ND_PRINT((ndo, "close "));
+ ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
break;
case DCCP_PKT_RESET: {
- struct dccp_hdr_reset *dhr =
- (struct dccp_hdr_reset *)(bp + fixed_hdrlen);
+ const struct dccp_hdr_reset *dhr =
+ (const 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));
+ ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ len - fixed_hdrlen));
return;
}
ND_TCHECK(*dhr);
- ND_PRINT((ndo, "reset (code=%s) ",
- dccp_reset_code(dhr->dccph_reset_code)));
+ ND_PRINT((ndo, "%s (code=%s) ",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ 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));
+ ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ len - fixed_hdrlen));
return;
}
- ND_PRINT((ndo, "sync "));
+ ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
break;
case DCCP_PKT_SYNCACK:
fixed_hdrlen += 8;
if (len < fixed_hdrlen) {
- ND_PRINT((ndo, "truncated-dccp syncack - %u bytes missing!",
- len - fixed_hdrlen));
+ ND_PRINT((ndo, "truncated-%s - %u bytes missing!",
+ tok2str(dccp_pkt_type_str, "", dccph_type),
+ len - fixed_hdrlen));
return;
}
- ND_PRINT((ndo, "syncack "));
+ ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "", dccph_type)));
break;
default:
- ND_PRINT((ndo, "invalid "));
+ ND_PRINT((ndo, "%s ", tok2str(dccp_pkt_type_str, "unknown-type-%u", dccph_type)));
break;
}
/* process options */
if (hlen > fixed_hdrlen){
- const u_char *cp;
u_int optlen;
cp = bp + fixed_hdrlen;
ND_PRINT((ndo, " <"));
{ 42, "timestamp_echo" },
{ 43, "elapsed_time" },
{ 44, "data_checksum" },
- { 0, NULL }
+ { 0, NULL }
};
static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
{
- u_int8_t optlen, i;
+ uint8_t optlen, i;
ND_TCHECK(*option);
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)));
+ tok2str(dccp_option_values, "Option %u", *option)));
return 0;
}
} else
if (hlen < optlen) {
if (*option >= 128)
ND_PRINT((ndo, "CCID option %u optlen goes past header length",
- *option));
+ *option));
else
ND_PRINT((ndo, "%s optlen goes past header length",
- tok2str(dccp_option_values, "Option %u", *option)));
+ tok2str(dccp_option_values, "Option %u", *option)));
return 0;
}
ND_TCHECK2(*option, optlen);
projects / tcpdump / blobdiff