don't pass on src & dst MAC adresses to the isoclns decoder as MAC adresses

[tcpdump] / print-ip.c

diff --git a/print-ip.c b/print-ip.c
index 15729538114e3b591649a58208f3e6a563d73dc3..f3471c5057854358336b4e7940bda57605dd6b6d 100644 (file)
--- a/print-ip.c
+++ b/print-ip.c
@@ -21,7 +21,7 @@
 
 #ifndef lint
 static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.120 2003-02-05 02:30:39 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.125 2003-05-21 08:39:57 hannes Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -339,6 +339,21 @@ in_cksum_shouldbe(u_int16_t sum, u_int16_t computed_sum)
        return shouldbe;
 }
 
+#ifndef IP_MF
+#define IP_MF 0x2000
+#endif /* IP_MF */
+#ifndef IP_DF
+#define IP_DF 0x4000
+#endif /* IP_DF */
+#define IP_RES 0x8000
+
+static struct tok ip_frag_values[] = {
+        { IP_MF,        "+" },
+        { IP_DF,        "DF" },
+       { IP_RES,       "rsvd" }, /* The RFC3514 evil ;-) bit */
+        { 0,            NULL }
+};
+
 /*
  * print an IP datagram.
  */
@@ -351,6 +366,10 @@ ip_print(register const u_char *bp, register u_int length)
        u_char nh;
        int advance;
        struct protoent *proto;
+       u_int16_t sum, ip_sum;
+       const char *sep = "";
+
+       printf("IP%s ", (((*bp >> 4) & 0xf) == 4) ? "" : "%u", (*bp >> 4) & 0xf); /* print version if != 4 */
 
        ip = (const struct ip *)bp;
        if ((u_char *)(ip + 1) > snapend) {
@@ -393,10 +412,18 @@ ip_print(register const u_char *bp, register u_int length)
             }
 
             if (ip->ip_ttl >= 1)
-                (void)printf(", ttl %u", ip->ip_ttl);    
+                (void)printf(", ttl %3u", ip->ip_ttl);    
+
+           /*
+            * for the firewall guys, print id, offset.
+             * On all but the last stick a "+" in the flags portion.
+            * For unfragmented datagrams, note the don't fragment flag.
+            */
 
-            if ((off & 0x3fff) != 0)
-                (void)printf(", id %u", EXTRACT_16BITS(&ip->ip_id));
+           (void)printf(", id %u, offset %u, flags [%s]",
+                            EXTRACT_16BITS(&ip->ip_id),
+                            (off & 0x1fff) * 8,
+                            bittok2str(ip_frag_values, "none", off & 0xe000 ));
 
             (void)printf(", length: %u", EXTRACT_16BITS(&ip->ip_len));
 
@@ -405,6 +432,18 @@ ip_print(register const u_char *bp, register u_int length)
                 ip_optprint((u_char *)(ip + 1), hlen - sizeof(struct ip));
                 printf(" )");
             }
+
+           if ((u_char *)ip + hlen <= snapend) {
+               sum = in_cksum((const u_short *)ip, hlen, 0);
+               if (sum != 0) {
+                   ip_sum = EXTRACT_16BITS(&ip->ip_sum);
+                   (void)printf("%sbad cksum %x (->%x)!", sep,
+                            ip_sum,
+                            in_cksum_shouldbe(ip_sum, sum));
+                   sep = ", ";
+               }
+           }
+
             printf(") ");
        }
 
@@ -480,7 +519,8 @@ again:
                        break;
 
                case IPPROTO_ICMP:
-                       icmp_print(cp, len, (const u_char *)ip);
+                       /* pass on the MF bit plus the offset to detect fragments */
+                       icmp_print(cp, len, (const u_char *)ip, (off & 0x3fff));
                        break;
 
 #ifndef IPPROTO_IGRP
@@ -575,60 +615,23 @@ again:
                        printf(" %d", len);
                        break;
                }
-       }
-
-       /* Ultra quiet now means that all this stuff should be suppressed */
-       /* res 3-Nov-98 */
-       if (qflag > 1) return;
-
-
-       /*
-        * for fragmented datagrams, print id:size@offset.  On all
-        * but the last stick a "+".  For unfragmented datagrams, note
-        * the don't fragment flag.
-        */
-       len = len0;     /* get the original length */
-       if (off & 0x3fff) {
-               /*
-                * if this isn't the first frag, we're missing the
-                * next level protocol header.  print the ip addr
-                * and the protocol.
-                */
-               if (off & 0x1fff) {
-                       (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
-                                     ipaddr_string(&ip->ip_dst));
-                       if ((proto = getprotobynumber(ip->ip_p)) != NULL)
-                               (void)printf(" %s", proto->p_name);
-                       else
-                               (void)printf(" ip-proto-%d", ip->ip_p);
-               }
-#ifndef IP_MF
-#define IP_MF 0x2000
-#endif /* IP_MF */
-#ifndef IP_DF
-#define IP_DF 0x4000
-#endif /* IP_DF */
-               (void)printf(" (frag %u:%u@%u%s)", EXTRACT_16BITS(&ip->ip_id), len,
-                       (off & 0x1fff) * 8,
-                       (off & IP_MF)? "+" : "");
-
-       } else if (off & IP_DF)
-               (void)printf(" (DF)");
-
-       if (vflag) {
-               u_int16_t sum, ip_sum;
-               const char *sep = "";
-
-               if ((u_char *)ip + hlen <= snapend) {
-                       sum = in_cksum((const u_short *)ip, hlen, 0);
-                       if (sum != 0) {
-                               ip_sum = EXTRACT_16BITS(&ip->ip_sum);
-                               (void)printf("%sbad cksum %x (->%x)!", sep,
-                                            ip_sum,
-                                            in_cksum_shouldbe(ip_sum, sum));
-                               sep = ", ";
-                       }
-               }
+       } else {
+           /* Ultra quiet now means that all this stuff should be suppressed */
+           if (qflag > 1) return;
+
+           /*
+            * if this isn't the first frag, we're missing the
+            * next level protocol header.  print the ip addr
+            * and the protocol.
+            */
+           if (off & 0x1fff) {
+               (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
+                            ipaddr_string(&ip->ip_dst));
+               if ((proto = getprotobynumber(ip->ip_p)) != NULL)
+                   (void)printf(" %s", proto->p_name);
+               else
+                   (void)printf(" ip-proto-%d", ip->ip_p);
+           } 
        }
 }