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+/* $OpenBSD: print-carp.c,v 1.6 2009/10/27 23:59:55 deraadt Exp $ */
+
+/*
+ * Copyright (c) 2000 William C. Fenner.
+ * All rights reserved.
+ *
+ * Kevin Steves <ks@hp.se> July 2000
+ * Modified to:
+ * - print version, type string and packet length
+ * - print IP address count if > 1 (-v)
+ * - verify checksum (-v)
+ * - print authentication string (-v)
+ *
+ * Copyright (c) 2011 Advanced Computing Technologies
+ * George V. Neille-Neil
+ *
+ * Modified to:
+ * - work correctly with CARP
+ * - compile into the latest tcpdump
+ * - print out the counter
+ *
+ * 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, and (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.
+ * The name of William C. Fenner may not 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: Common Address Redundancy Protocol (CARP) printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h" /* for checksum structure and functions */
+#include "extract.h"
+
+void
+carp_print(netdissect_options *ndo, const u_char *bp, u_int len, u_int ttl)
+{
+ u_int version, type;
+ const char *type_s;
+
+ ndo->ndo_protocol = "carp";
+ version = (GET_U_1(bp) & 0xf0) >> 4;
+ type = GET_U_1(bp) & 0x0f;
+ if (type == 1)
+ type_s = "advertise";
+ else
+ type_s = "unknown";
+ ND_PRINT("CARPv%u-%s %u: ", version, type_s, len);
+ if (ttl != 255)
+ ND_PRINT("[ttl=%u!] ", ttl);
+ if (version != 2 || type != 1)
+ return;
+ ND_PRINT("vhid=%u advbase=%u advskew=%u authlen=%u ",
+ GET_U_1(bp + 1), GET_U_1(bp + 5), GET_U_1(bp + 2),
+ GET_U_1(bp + 3));
+ if (ndo->ndo_vflag) {
+ struct cksum_vec vec[1];
+ vec[0].ptr = (const uint8_t *)bp;
+ vec[0].len = len;
+ if (ND_TTEST_LEN(bp, len) && in_cksum(vec, 1))
+ ND_PRINT(" (bad carp cksum %x!)",
+ GET_BE_U_2(bp + 6));
+ }
+ ND_PRINT("counter=%" PRIu64, GET_BE_U_8(bp + 8));
+}