Correctly check for various values of the ICMP type field.

[tcpdump] / print-mpls.c

diff --git a/print-mpls.c b/print-mpls.c
index 4e7b3782f1aafb5d963a0a956cf84bcfeb39ca01..c6b0814ffefcac2f5c848584849cc9f70748b161 100644 (file)
--- a/print-mpls.c
+++ b/print-mpls.c
@@ -27,8 +27,8 @@
  */
 
 #ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-mpls.c,v 1.5 2002-08-08 19:52:48 hannes Exp $ (LBL)";
+static const char rcsid[] _U_ =
+    "@(#) $Header: /tcpdump/master/tcpdump/print-mpls.c,v 1.14 2005-07-05 09:38:19 hannes Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -44,20 +44,7 @@ static const char rcsid[] =
 #include "addrtoname.h"
 #include "interface.h"
 #include "extract.h"                   /* must come after interface.h */
-
-#define LABEL_MASK     0xfffff000
-#define LABEL_SHIFT    12
-#define        EXP_MASK        0x00000e00
-#define EXP_SHIFT      9
-#define        STACK_MASK      0x00000100
-#define STACK_SHIFT    8
-#define TTL_MASK       0x000000ff
-#define TTL_SHIFT      0
-
-#define MPLS_LABEL(x)  (((x) & LABEL_MASK) >> LABEL_SHIFT)
-#define MPLS_EXP(x)    (((x) & EXP_MASK) >> EXP_SHIFT)
-#define MPLS_STACK(x)  (((x) & STACK_MASK) >> STACK_SHIFT)
-#define MPLS_TTL(x)    (((x) & TTL_MASK) >> TTL_SHIFT)
+#include "mpls.h"
 
 static const char *mpls_labelname[] = {
 /*0*/  "IPv4 explicit NULL", "router alert", "IPv6 explicit NULL",
@@ -74,37 +61,45 @@ void
 mpls_print(const u_char *bp, u_int length)
 {
        const u_char *p;
-       u_int32_t v;
+       u_int32_t label_entry;
+        u_int16_t label_stack_depth = 0;
 
        p = bp;
        printf("MPLS");
        do {
-               TCHECK2(*p, sizeof(v));
-               v = EXTRACT_32BITS(p);
-               printf(" (");   /*)*/
-               printf("label %u", MPLS_LABEL(v));
+               TCHECK2(*p, sizeof(label_entry));
+               label_entry = EXTRACT_32BITS(p);
+               printf("%s(label %u",
+                       label_stack_depth ? "\n\t" : " ",
+                       MPLS_LABEL(label_entry));
+                label_stack_depth++;
                if (vflag &&
-                   MPLS_LABEL(v) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0]))
-                       printf(" (%s)", mpls_labelname[MPLS_LABEL(v)]);
-               if (MPLS_EXP(v))
-                       printf(", exp %u", MPLS_EXP(v));
-               if (MPLS_STACK(v))
+                   MPLS_LABEL(label_entry) < sizeof(mpls_labelname) / sizeof(mpls_labelname[0]))
+                       printf(" (%s)", mpls_labelname[MPLS_LABEL(label_entry)]);
+               printf(", exp %u", MPLS_EXP(label_entry));
+               if (MPLS_STACK(label_entry))
                        printf(", [S]");
-               printf(", ttl %u", MPLS_TTL(v));
-               /*(*/
-               printf(")");
+               printf(", ttl %u)", MPLS_TTL(label_entry));
 
-               p += sizeof(v);
-       } while (!MPLS_STACK(v));
+               p += sizeof(label_entry);
+       } while (!MPLS_STACK(label_entry));
 
-       switch (MPLS_LABEL(v)) {
+       switch (MPLS_LABEL(label_entry)) {
        case 0: /* IPv4 explicit NULL label */
         case 3:        /* IPv4 implicit NULL label */
-               ip_print(p, length - (p - bp));
+                if (vflag>0) {
+                        printf("\n\t");
+                        ip_print(gndo, p, length - (p - bp));
+                }
+                else printf(", IP, length: %u",length);
                break;
 #ifdef INET6
        case 2: /* IPv6 explicit NULL label */
-               ip6_print(p, length - (p - bp));
+                if (vflag>0) {
+                        printf("\n\t");
+                        ip6_print(p, length - (p - bp));
+                }
+                else printf(", IPv6, length: %u",length);
                break;
 #endif
        default:
@@ -115,13 +110,13 @@ mpls_print(const u_char *bp, u_int length)
                  * bit is set and tries to determine the network layer protocol
                  * 0x45-0x4f is IPv4
                  * 0x60-0x6f is IPv6
-                 * 0x83      is IS-IS
+                 * 0x81-0x83 is OSI (CLNP,ES-IS,IS-IS)
                  * this technique is sometimes known as NULL encapsulation
                  * and decoding is particularly useful for control-plane traffic [BGP]
                  * which cisco by default sends MPLS encapsulated
                 */
 
-                if (MPLS_STACK(v)) { /* only do this if the stack bit is set */
+                if (MPLS_STACK(label_entry)) { /* only do this if the stack bit is set */
                     switch(*p) {
                     case 0x45:
                     case 0x46:
@@ -134,8 +129,11 @@ mpls_print(const u_char *bp, u_int length)
                     case 0x4d:
                     case 0x4e:
                     case 0x4f:
-                        printf("\n\t");
-                        ip_print(p, length - (p - bp));
+                       if (vflag>0) {
+                            printf("\n\t");
+                            ip_print(gndo, p, length - (p - bp));
+                           }
+                        else printf(", IP, length: %u",length);
                         break;
 #ifdef INET6
                     case 0x60:
@@ -154,13 +152,21 @@ mpls_print(const u_char *bp, u_int length)
                     case 0x6d:
                     case 0x6e:
                     case 0x6f:
-                        printf("\n\t");
-                        ip6_print(p, length - (p - bp));
+                       if (vflag>0) {
+                            printf("\n\t");
+                            ip6_print(p, length - (p - bp));
+                            }
+                       else printf(", IPv6, length: %u",length);
                         break;
 #endif
+                    case 0x81:
+                    case 0x82:
                     case 0x83:
-                        printf("\n\t");
-                        isoclns_print(p, length - (p - bp), length - (p - bp), NULL, NULL);
+                       if (vflag>0) {
+                            printf("\n\t");
+                            isoclns_print(p, length - (p - bp), length - (p - bp));
+                           }
+                       else printf(", OSI, length: %u",length);
                         break;
                     default:
                         /* ok bail out - we did not figure out what it is*/
@@ -174,3 +180,10 @@ trunc:
        printf("[|MPLS]");
 }
 
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */