X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/99c91c3aec40b691641374f58e798bd8d6b657bd..d7b497cac78b6e22a66a6bae9bdec60a8044f67a:/print-otv.c?ds=sidebyside

diff --git a/print-otv.c b/print-otv.c
index 3490d066..f4daacfa 100644
--- a/print-otv.c
+++ b/print-otv.c
@@ -13,6 +13,10 @@
  * Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com)
  */
 
+/* \summary: Overlay Transport Virtualization (OTV) printer */
+
+/* specification: draft-hasmit-otv-04 */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -22,6 +26,8 @@
 #include "netdissect.h"
 #include "extract.h"
 
+#define OTV_HDR_LEN 8
+
 /*
  * OTV header, draft-hasmit-otv-04
  *
@@ -38,27 +44,31 @@ void
 otv_print(netdissect_options *ndo, const u_char *bp, u_int len)
 {
     uint8_t flags;
-    uint32_t overlay_id;
-    uint32_t instance_id;
 
-    if (len < 8) {
-        ND_PRINT((ndo, "[|OTV]"));
-        return;
-    }
+    ND_PRINT((ndo, "OTV, "));
+    if (len < OTV_HDR_LEN)
+        goto trunc;
 
+    ND_TCHECK(*bp);
     flags = *bp;
+    ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags));
     bp += 1;
 
-    overlay_id = EXTRACT_24BITS(bp);
+    ND_TCHECK_3(bp);
+    ND_PRINT((ndo, "overlay %u, ", EXTRACT_BE_U_3(bp)));
     bp += 3;
 
-    instance_id = EXTRACT_24BITS(bp);
-    bp += 4;
+    ND_TCHECK_3(bp);
+    ND_PRINT((ndo, "instance %u\n", EXTRACT_BE_U_3(bp)));
+    bp += 3;
 
-    ND_PRINT((ndo, "OTV, "));
-    ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags));
-    ND_PRINT((ndo, "overlay %u, ", overlay_id));
-    ND_PRINT((ndo, "instance %u\n", instance_id));
+    /* Reserved */
+    ND_TCHECK(*bp);
+    bp += 1;
+
+    ether_print(ndo, bp, len - OTV_HDR_LEN, ndo->ndo_snapend - bp, NULL, NULL);
+    return;
 
-    ether_print(ndo, bp, len - 8, len - 8, NULL, NULL);
+trunc:
+    ND_PRINT((ndo, " [|OTV]"));
 }