Date: Fri, 8 May 1998 13:54:39 -0400 (EDT)
From: "Jamal Hadi Salim" <"Jamal.Hadi Salim.hadi"@nt.com>
To: ecn-interest@research.att.com
Subject: tcpdump patch to print ECN info
Message-ID: <Pine.SOL.3.96.980508134239.10222B-100000@bgtys30>


against 3.4a5; feel free to change the output 


-----------------------------
diff -ru tcpdump-3.4a5-orig/print-ip.c tcpdump-3.4a5/print-ip.c
--- tcpdump-3.4a5-orig/print-ip.c       Fri May  8 13:42:02 1998
+++ tcpdump-3.4a5/print-ip.c    Fri May  8 13:03:45 1998
@@ -490,7 +490,14 @@
                (void)printf(" (DF)");
 
        if (ip->ip_tos)
+               {
                (void)printf(" [tos 0x%x]", (int)ip->ip_tos);
+               /* ECN bits */
+               if (ip->ip_tos &0x01)
+               (void)printf(" [CE] ");
+               if (ip->ip_tos &0x02)
+               (void)printf(" [ECT] ");
+               }
        if (ip->ip_ttl <= 1)
                (void)printf(" [ttl %d]", (int)ip->ip_ttl);
 
diff -ru tcpdump-3.4a5-orig/print-tcp.c tcpdump-3.4a5/print-tcp.c
--- tcpdump-3.4a5-orig/print-tcp.c      Fri May  8 13:42:02 1998
+++ tcpdump-3.4a5/print-tcp.c   Fri May  8 13:32:06 1998
@@ -75,6 +75,7 @@
 #define TCPOPT_CCECHO          13      /* T/TCP CC options (rfc1644) */
 #endif
 
+#define ECE_ON         0x40    /* ECN notify */
 struct tha {
        struct in_addr src;
        struct in_addr dst;
@@ -143,6 +144,9 @@
                        putchar('P');
        } else
                putchar('.');
+       flags = tp->th_flags;
+       if (flags & ECE_ON) 
+               printf(" [TCP-ECE]");
 
        if (!Sflag && (flags & TH_ACK)) {
                register struct tcp_seq_hash *th;

--------------------------------------------------

cheers,
jamal

Computing Technology Labs, Nortel