From f7b5fc832288fae3f5a0f3d24b96782252aabbaf Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 5 May 2024 19:41:34 +0200
Subject: Adding upstream version 4.99.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 print-loopback.c | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 print-loopback.c

(limited to 'print-loopback.c')

diff --git a/print-loopback.c b/print-loopback.c
new file mode 100644
index 0000000..ee0caf3
--- /dev/null
+++ b/print-loopback.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2014 The TCPDUMP project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* \summary: Loopback Protocol printer */
+
+/*
+ * originally defined as the Ethernet Configuration Testing Protocol.
+ * specification: https://www.mit.edu/people/jhawk/ctp.pdf
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+#include "addrtoname.h"
+
+
+#define LOOPBACK_REPLY   1
+#define LOOPBACK_FWDDATA 2
+
+static const struct tok fcode_str[] = {
+	{ LOOPBACK_REPLY,   "Reply"        },
+	{ LOOPBACK_FWDDATA, "Forward Data" },
+	{ 0, NULL }
+};
+
+static void
+loopback_message_print(netdissect_options *ndo,
+                       const u_char *cp, u_int len)
+{
+	uint16_t function;
+
+	if (len < 2)
+		goto invalid;
+	/* function */
+	function = GET_LE_U_2(cp);
+	cp += 2;
+	len -= 2;
+	ND_PRINT(", %s", tok2str(fcode_str, " invalid (%u)", function));
+
+	switch (function) {
+		case LOOPBACK_REPLY:
+			if (len < 2)
+				goto invalid;
+			/* receipt number */
+			ND_PRINT(", receipt number %u", GET_LE_U_2(cp));
+			cp += 2;
+			len -= 2;
+			/* data */
+			ND_PRINT(", data (%u octets)", len);
+			ND_TCHECK_LEN(cp, len);
+			break;
+		case LOOPBACK_FWDDATA:
+			if (len < MAC_ADDR_LEN)
+				goto invalid;
+			/* forwarding address */
+			ND_PRINT(", forwarding address %s", GET_ETHERADDR_STRING(cp));
+			cp += MAC_ADDR_LEN;
+			len -= MAC_ADDR_LEN;
+			/* data */
+			ND_PRINT(", data (%u octets)", len);
+			ND_TCHECK_LEN(cp, len);
+			break;
+		default:
+			ND_TCHECK_LEN(cp, len);
+			break;
+	}
+	return;
+
+invalid:
+	nd_print_invalid(ndo);
+	ND_TCHECK_LEN(cp, len);
+}
+
+void
+loopback_print(netdissect_options *ndo,
+               const u_char *cp, u_int len)
+{
+	uint16_t skipCount;
+
+	ndo->ndo_protocol = "loopback";
+	ND_PRINT("Loopback");
+	if (len < 2)
+		goto invalid;
+	/* skipCount */
+	skipCount = GET_LE_U_2(cp);
+	cp += 2;
+	len -= 2;
+	ND_PRINT(", skipCount %u", skipCount);
+	if (skipCount % 8)
+		ND_PRINT(" (bogus)");
+	if (skipCount > len)
+		goto invalid;
+	/* the octets to skip */
+	ND_TCHECK_LEN(cp, skipCount);
+	cp += skipCount;
+	len -= skipCount;
+	/* the first message to decode */
+	loopback_message_print(ndo, cp, len);
+	return;
+
+invalid:
+	nd_print_invalid(ndo);
+	ND_TCHECK_LEN(cp, len);
+}
+
-- 
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