1 files changed, 62 insertions, 0 deletions
diff --git a/print-frag6.c b/print-frag6.c
new file mode 100644
index 0000000..a4b3be0
--- /dev/null
+++ b/print-frag6.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/* \summary: IPv6 fragmentation header printer */
+
+#include <config.h>
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "extract.h"
+
+#include "ip6.h"
+
+int
+frag6_print(netdissect_options *ndo, const u_char *bp, const u_char *bp2)
+{
+	const struct ip6_frag *dp;
+	const struct ip6_hdr *ip6;
+
+	ndo->ndo_protocol = "frag6";
+	dp = (const struct ip6_frag *)bp;
+	ip6 = (const struct ip6_hdr *)bp2;
+
+	ND_PRINT("frag (");
+	if (ndo->ndo_vflag)
+		ND_PRINT("0x%08x:", GET_BE_U_4(dp->ip6f_ident));
+	ND_PRINT("%u|", GET_BE_U_2(dp->ip6f_offlg) & IP6F_OFF_MASK);
+	if ((bp - bp2) + sizeof(struct ip6_frag) >
+	    sizeof(struct ip6_hdr) + GET_BE_U_2(ip6->ip6_plen))
+		ND_PRINT("[length < 0] (invalid))");
+	else
+		ND_PRINT("%zu)",
+			 sizeof(struct ip6_hdr) + GET_BE_U_2(ip6->ip6_plen) -
+			 (bp - bp2) - sizeof(struct ip6_frag));
+
+	/* it is meaningless to decode non-first fragment */
+	if ((GET_BE_U_2(dp->ip6f_offlg) & IP6F_OFF_MASK) != 0)
+		return -1;
+	else {
+		ND_PRINT(" ");
+		return sizeof(struct ip6_frag);
+	}
+}