X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/33fe8e7d3cdd730b734c5b82747c9b2c6a6a9b01..c7415f9189e77eace13a80ca953bf3cffddc9013:/print-tcp.c

diff --git a/print-tcp.c b/print-tcp.c
index d45a2957..54ae3d55 100644
--- a/print-tcp.c
+++ b/print-tcp.c
@@ -21,7 +21,7 @@
 
 #ifndef lint
 static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.85 2001-03-09 05:38:21 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.88 2001-08-20 17:53:53 fenner Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -58,45 +58,6 @@ static void print_tcp_rst_data(register const u_char *sp, u_int length);
 
 #define MAX_RST_DATA_LEN	30
 
-/* Compatibility */
-#ifndef TCPOPT_WSCALE
-#define	TCPOPT_WSCALE		3	/* window scale factor (rfc1072) */
-#endif
-#ifndef TCPOPT_SACKOK
-#define	TCPOPT_SACKOK		4	/* selective ack ok (rfc1072) */
-#endif
-#ifndef TCPOPT_SACK
-#define	TCPOPT_SACK		5	/* selective ack (rfc1072) */
-#endif
-#ifndef TCPOPT_ECHO
-#define	TCPOPT_ECHO		6	/* echo (rfc1072) */
-#endif
-#ifndef TCPOPT_ECHOREPLY
-#define	TCPOPT_ECHOREPLY	7	/* echo (rfc1072) */
-#endif
-#ifndef TCPOPT_TIMESTAMP
-#define TCPOPT_TIMESTAMP	8	/* timestamps (rfc1323) */
-#endif
-#ifndef TCPOPT_CC
-#define TCPOPT_CC		11	/* T/TCP CC options (rfc1644) */
-#endif
-#ifndef TCPOPT_CCNEW
-#define TCPOPT_CCNEW		12	/* T/TCP CC options (rfc1644) */
-#endif
-#ifndef TCPOPT_CCECHO
-#define TCPOPT_CCECHO		13	/* T/TCP CC options (rfc1644) */
-#endif
-
-/*
- * Definitions required for ECN
- * for use if the OS running tcpdump does not have ECN
- */
-#ifndef TH_ECNECHO
-#define TH_ECNECHO		0x40	/* ECN Echo in tcp header */
-#endif
-#ifndef TH_CWR
-#define TH_CWR			0x80	/* ECN Cwnd Reduced in tcp header*/
-#endif
 
 struct tha {
 #ifndef INET6
@@ -143,7 +104,6 @@ static int tcp_cksum(register const struct ip *ip,
 		     register const struct tcphdr *tp,
 		     register int len)
 {
-	int i, tlen;
 	union phu {
 		struct phdr {
 			u_int32_t src;
@@ -154,34 +114,18 @@ static int tcp_cksum(register const struct ip *ip,
 		} ph;
 		u_int16_t pa[6];
 	} phu;
-	register const u_int16_t *sp;
-	u_int32_t sum;
-	tlen = ntohs(ip->ip_len) - ((const char *)tp-(const char*)ip);
+	const u_int16_t *sp;
 
 	/* pseudo-header.. */
-	phu.ph.len = htons(tlen);
+	phu.ph.len = htons(len);	/* XXX */
 	phu.ph.mbz = 0;
 	phu.ph.proto = IPPROTO_TCP;
 	memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
 	memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
 
 	sp = &phu.pa[0];
-	sum = sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5];
-
-	sp = (const u_int16_t *)tp;
-
-	for (i=0; i<(tlen&~1); i+= 2)
-		sum += *sp++;
-
-	if (tlen & 1) {
-		sum += htons( (*(const u_int8_t *)sp) << 8);
-	}
-
-	while (sum > 0xffff)
-		sum = (sum & 0xffff) + (sum >> 16);
-	sum = ~sum & 0xffff;
-
-	return (sum);
+	return in_cksum((u_short *)tp, len,
+			sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]);
 }
 
 #ifdef INET6
@@ -284,7 +228,7 @@ tcp_print(register const u_char *bp, register u_int length,
 		} else if ((u_char *)tp + 4 + sizeof(struct rpc_msg)
 			   <= snapend &&
 			   sport == NFS_PORT) {
-			nfsreply_print((u_char *)tp + hlen + 4,length-hlen,
+			nfsreply_print((u_char *)tp + hlen + 4, length - hlen,
 				       (u_char *)ip);
 			return;
 		}