* BSD-style license that accompanies tcpdump or the GNU GPL version 2
*/
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+/* \summary: Datagram Congestion Control Protocol (DCCP) printer */
-#include <tcpdump-stdinc.h>
+/* specification: RFC 4340 */
-#include <stdio.h>
-#include <string.h>
+#include <config.h>
-#include "interface.h"
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#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,
+ nd_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];
-} UNALIGNED;
+ 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
* @dccph_seq - 48-bit sequence number
*/
struct dccp_hdr_ext {
- u_int16_t dccph_sport,
+ nd_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];
-} UNALIGNED;
+ 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) (((dh)->dccph_ccval_cscov >> 4) & 0xF)
-#define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov) & 0xF)
+#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) ((dh)->dccph_xtr & 1)
-#define DCCPH_TYPE(dh) (((dh)->dccph_xtr >> 1) & 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 - Conection initiation request header
+ * struct dccp_hdr_request - Connection initiation request header
*
* @dccph_req_service - Service to which the client app wants to connect
*/
struct dccp_hdr_request {
- u_int32_t dccph_req_service;
-} UNALIGNED;
+ nd_uint32_t dccph_req_service;
+};
/**
- * struct dccp_hdr_response - Conection initiation response header
+ * 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 {
- u_int8_t dccph_resp_ack[8]; /* always 8 bytes */
- u_int32_t dccph_resp_service;
-} UNALIGNED;
+ 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_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,
- dccph_reset_data[3];
-} UNALIGNED;
+ 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_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 {
DCCP_RESET_CODE_TOO_BUSY,
DCCP_RESET_CODE_BAD_INIT_COOKIE,
DCCP_RESET_CODE_AGGRESSION_PENALTY,
- __DCCP_RESET_CODE_LAST
};
-static const char tstr[] = "[|dccp]";
-
-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 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 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 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 inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
+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 = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(u_int32_t);
+ cov = (GET_U_1(dh->dccph_doff) + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
return (cov > len)? len : cov;
}
-static int dccp_cksum(const struct ip *ip,
+static uint16_t 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,
- 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, len,
- dccp_csum_coverage(dh, len), IPPROTO_DCCP);
+ return nextproto4_cksum(ndo, ip, (const uint8_t *)(const void *)dh, len,
+ dccp_csum_coverage(ndo, dh, len), IPPROTO_DCCP);
}
-#endif
-static const char *dccp_reset_code(u_int8_t code)
+static uint16_t dccp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
+ const struct dccp_hdr *dh, u_int len)
{
- if (code >= __DCCP_RESET_CODE_LAST)
- return "invalid";
- return dccp_reset_codes[code];
+ return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)dh, len,
+ dccp_csum_coverage(ndo, dh, len), IPPROTO_DCCP);
}
-static u_int64_t dccp_seqno(const u_char *bp)
+static uint64_t
+dccp_seqno(netdissect_options *ndo, 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;
- seqno = EXTRACT_48BITS(dhx->dccph_seq);
+ seqno = GET_BE_U_6(dhx->dccph_seq);
} else {
- seqno = EXTRACT_24BITS(dh->dccph_seq);
+ seqno = GET_BE_U_3(dh->dccph_seq);
}
return seqno;
}
-static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
+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(dh);
- u_int64_t ackno;
+ const u_char *ackp = bp + dccp_basic_hdr_len(ndo, dh);
+ uint64_t ackno;
if (DCCPH_X(dh) != 0) {
- ND_TCHECK2(*ackp, 8);
- ackno = EXTRACT_48BITS(ackp + 2);
+ ackno = GET_BE_U_6(ackp + 2);
} else {
- ND_TCHECK2(*ackp, 4);
- ackno = EXTRACT_24BITS(ackp + 1);
+ ackno = GET_BE_U_3(ackp + 1);
}
- ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno));
-trunc:
- return;
+ ND_PRINT("(ack=%" PRIu64 ") ", ackno);
}
-static int dccp_print_option(netdissect_options *, const u_char *, u_int);
+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 - lenght of ip packet
+ * @len - length of ip packet
*/
-void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
- u_int len)
+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;
-#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;
+ ndo->ndo_protocol = "dccp";
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 (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;
- }
+ ND_ICHECK_ZU(length, <, sizeof(struct dccp_hdr));
/* 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);
+ fixed_hdrlen = dccp_basic_hdr_len(ndo, dh);
+ ND_ICHECK_U(length, <, fixed_hdrlen);
+ ND_TCHECK_LEN(dh, fixed_hdrlen);
- sport = EXTRACT_16BITS(&dh->dccph_sport);
- dport = EXTRACT_16BITS(&dh->dccph_dport);
- hlen = dh->dccph_doff * 4;
+ sport = GET_BE_U_2(dh->dccph_sport);
+ dport = GET_BE_U_2(dh->dccph_dport);
+ hlen = GET_U_1(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*/
- {
- ND_PRINT((ndo, "%s.%d > %s.%d: ",
- ipaddr_string(&ip->ip_src), sport,
- ipaddr_string(&ip->ip_dst), dport));
+ 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);
}
- fflush(stdout);
+
+ nd_print_protocol_caps(ndo);
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_ICHECK_U(length, <, hlen);
+ ND_PRINT(" %u", length - hlen);
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(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), "));
+ 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(")");
}
- switch (DCCPH_TYPE(dh)) {
+ 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: {
- 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));
- return;
- }
- ND_TCHECK(*dhr);
- ND_PRINT((ndo, "request (service=%d) ",
- EXTRACT_32BITS(&dhr->dccph_req_service)));
+ ND_ICHECK_U(length, <, fixed_hdrlen);
+ ND_PRINT("(service=%u) ", GET_BE_U_4(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));
- return;
- }
- ND_TCHECK(*dhr);
- ND_PRINT((ndo, "response (service=%d) ",
- EXTRACT_32BITS(&dhr->dccph_resp_service)));
+ ND_ICHECK_U(length, <, fixed_hdrlen);
+ ND_PRINT("(service=%u) ", GET_BE_U_4(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 "));
+ ND_ICHECK_U(length, <, fixed_hdrlen);
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 "));
+ ND_ICHECK_U(length, <, fixed_hdrlen);
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 "));
+ ND_ICHECK_U(length, <, fixed_hdrlen);
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 "));
+ ND_ICHECK_U(length, <, fixed_hdrlen);
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));
- return;
- }
- ND_TCHECK(*dhr);
- ND_PRINT((ndo, "reset (code=%s) ",
- dccp_reset_code(dhr->dccph_reset_code)));
+ 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;
- if (len < fixed_hdrlen) {
- ND_PRINT((ndo, "truncated-dccp sync - %u bytes missing!",
- len - fixed_hdrlen));
- return;
- }
- ND_PRINT((ndo, "sync "));
+ ND_ICHECK_U(length, <, fixed_hdrlen);
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 "));
+ ND_ICHECK_U(length, <, fixed_hdrlen);
break;
default:
- ND_PRINT((ndo, "invalid "));
- break;
+ goto invalid;
}
if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
if (ndo->ndo_vflag < 2)
return;
- ND_PRINT((ndo, "seq %" PRIu64, dccp_seqno(bp)));
+ ND_PRINT("seq %" PRIu64, dccp_seqno(ndo, bp));
/* process options */
if (hlen > fixed_hdrlen){
- const u_char *cp;
u_int optlen;
cp = bp + fixed_hdrlen;
- ND_PRINT((ndo, " <"));
+ ND_PRINT(" <");
hlen -= fixed_hdrlen;
while(1){
optlen = dccp_print_option(ndo, cp, hlen);
if (!optlen)
- break;
+ goto invalid;
if (hlen <= optlen)
break;
hlen -= optlen;
cp += optlen;
- ND_PRINT((ndo, ", "));
+ ND_PRINT(", ");
}
- ND_PRINT((ndo, ">"));
+ ND_PRINT(">");
}
return;
-trunc:
- ND_PRINT((ndo, "%s", tstr));
- 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[] = {
- { 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 }
+ { 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 int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
+static u_int
+dccp_print_option(netdissect_options *ndo, const u_char *bp, u_int hlen)
{
- u_int8_t optlen, i;
-
- ND_TCHECK(*option);
+ uint8_t option, optlen, i;
- 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;
- }
+ 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;
- 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);
+ ND_ICHECKMSG_U("remaining length", hlen, <, optlen);
- if (*option >= 128) {
- ND_PRINT((ndo, "CCID option %d", *option));
+ if (option >= 128) {
switch (optlen) {
case 4:
- ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
+ ND_PRINT(" %u", GET_BE_U_2(bp + 2));
break;
case 6:
- ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
+ 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 {
- 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)));
- }
+ switch (option) {
+ case DCCP_OPTION_PADDING:
+ case DCCP_OPTION_MANDATORY:
+ case DCCP_OPTION_SLOW_RECEIVER:
+ ND_TCHECK_1(bp);
break;
- case 36:
- if (optlen > 2) {
- ND_PRINT((ndo, " 0x"));
- for (i = 0; i < optlen - 2; i++)
- ND_PRINT((ndo, "%02x", *(option + 2 + i)));
- }
+ 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 37:
- for (i = 0; i < optlen - 2; i++)
- ND_PRINT((ndo, " %d", *(option + 2 + i)));
+ 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 38:
- if (optlen > 2) {
- ND_PRINT((ndo, " 0x"));
- for (i = 0; i < optlen - 2; i++)
- ND_PRINT((ndo, "%02x", *(option + 2 + i)));
- }
+ 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 39:
- if (optlen > 2) {
- ND_PRINT((ndo, " 0x"));
- for (i = 0; i < optlen - 2; i++)
- ND_PRINT((ndo, "%02x", *(option + 2 + i)));
- }
+ 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 40:
- if (optlen > 2) {
- ND_PRINT((ndo, " 0x"));
- for (i = 0; i < optlen - 2; i++)
- ND_PRINT((ndo, "%02x", *(option + 2 + i)));
- }
+ 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 41:
- if (optlen == 4)
- ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
- else
- ND_PRINT((ndo, " optlen != 4"));
+ 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 42:
- if (optlen == 4)
- ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
- else
- ND_PRINT((ndo, " optlen != 4"));
+ 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 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"));
+ 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 44:
- if (optlen > 2) {
- ND_PRINT((ndo, " "));
- for (i = 0; i < optlen - 2; i++)
- ND_PRINT((ndo, "%02x", *(option + 2 + i)));
+ 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;
-trunc:
- ND_PRINT((ndo, "%s", tstr));
+invalid:
return 0;
}
projects / tcpdump / blobdiff