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+/* $NetBSD: print-ah.c,v 1.4 1996/05/20 00:41:16 fvdl Exp $ */
+
+/*
+ * Copyright (c) 1988, 1989, 1990, 1991, 1992, 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: IPSEC Authentication Header printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "extract.h"
+
+#include "ah.h"
+
+int
+ah_print(netdissect_options *ndo, const u_char *bp)
+{
+ const struct ah *ah;
+ uint8_t ah_len;
+ u_int ah_hdr_len;
+ uint16_t reserved;
+ const u_char *p;
+
+ ndo->ndo_protocol = "ah";
+ ah = (const struct ah *)bp;
+
+ nd_print_protocol_caps(ndo);
+/*
+ * RFC4302
+ *
+ * 2.2. Payload Length
+ *
+ * This 8-bit field specifies the length of AH in 32-bit words (4-byte
+ * units), minus "2".
+ */
+ ah_len = GET_U_1(ah->ah_len);
+ ah_hdr_len = (ah_len + 2) * 4;
+
+ ND_PRINT("(");
+ if (ndo->ndo_vflag)
+ ND_PRINT("length=%u(%u-bytes),", ah_len, ah_hdr_len);
+ reserved = GET_BE_U_2(ah->ah_reserved);
+ if (reserved)
+ ND_PRINT("reserved=0x%x[MustBeZero],", reserved);
+ ND_PRINT("spi=0x%08x,", GET_BE_U_4(ah->ah_spi));
+ ND_PRINT("seq=0x%x,", GET_BE_U_4(ah->ah_seq));
+ ND_PRINT("icv=0x");
+ for (p = (const u_char *)(ah + 1); p < bp + ah_hdr_len; p++)
+ ND_PRINT("%02x", GET_U_1(p));
+ ND_PRINT("): ");
+
+ return ah_hdr_len;
+}