X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/0b1de8f73d9b1484095a5ba484e83021ef7bc7ae..refs/heads/tcpdump-4.9:/print-dccp.c

diff --git a/print-dccp.c b/print-dccp.c
index 09cf72b2..bc3feb7c 100644
--- a/print-dccp.c
+++ b/print-dccp.c
@@ -7,22 +7,22 @@
  * 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) */
@@ -204,13 +204,12 @@ static int dccp_cksum(netdissect_options *ndo, const struct ip *ip,
 				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 uint8_t *)(const 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(uint8_t code)
 {
@@ -271,9 +270,7 @@ void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 {
 	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;
@@ -283,12 +280,10 @@ void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 	dh = (const struct dccp_hdr *)bp;
 
 	ip = (const 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);
@@ -315,14 +310,11 @@ void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 	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*/
-	{
+	} else {
 		ND_PRINT((ndo, "%s.%d > %s.%d: ",
 			  ipaddr_string(ndo, &ip->ip_src), sport,
 			  ipaddr_string(ndo, &ip->ip_dst), dport));
@@ -352,10 +344,8 @@ void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 		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
+			sum = dccp6_cksum(ndo, ip6, dh, len);
 		if (sum != 0)
 			ND_PRINT((ndo, "(incorrect -> 0x%04x)",in_cksum_shouldbe(dccp_sum, sum)));
 		else
@@ -497,7 +487,6 @@ void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 
 	/* process options */
 	if (hlen > fixed_hdrlen){
-		const u_char *cp;
 		u_int optlen;
 		cp = bp + fixed_hdrlen;
 		ND_PRINT((ndo, " <"));
@@ -541,7 +530,8 @@ static const struct tok dccp_option_values[] = {
 	{ 0, NULL }
 };
 
-static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
+static int
+dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
 {
 	uint8_t optlen, i;
 
@@ -634,16 +624,54 @@ static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_in
 			}
 			break;
 		case 41:
-			if (optlen == 4)
+		/*
+		 * 13.1.  Timestamp Option
+		 *
+		 *  +--------+--------+--------+--------+--------+--------+
+		 *  |00101001|00000110|          Timestamp Value          |
+		 *  +--------+--------+--------+--------+--------+--------+
+		 *   Type=41  Length=6
+		 */
+			if (optlen == 6)
 				ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 			else
-				ND_PRINT((ndo, " optlen != 4"));
+				ND_PRINT((ndo, " [optlen != 6]"));
 			break;
 		case 42:
-			if (optlen == 4)
+		/*
+		 * 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((ndo, " %u", EXTRACT_32BITS(option + 2)));
-			else
-				ND_PRINT((ndo, " optlen != 4"));
+				break;
+			case 8:
+				ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
+				ND_PRINT((ndo, " (elapsed time %u)", EXTRACT_16BITS(option + 6)));
+				break;
+			case 10:
+				ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
+				ND_PRINT((ndo, " (elapsed time %u)", EXTRACT_32BITS(option + 6)));
+				break;
+			default:
+				ND_PRINT((ndo, " [optlen != 6 or 8 or 10]"));
+				break;
+			}
 			break;
 		case 43:
 			if (optlen == 6)
@@ -651,7 +679,7 @@ static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_in
 			else if (optlen == 4)
 				ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 			else
-				ND_PRINT((ndo, " optlen != 4 or 6"));
+				ND_PRINT((ndo, " [optlen != 4 or 6]"));
 			break;
 		case 44:
 			if (optlen > 2) {