Add MS NLB heartbeat ethertype, as well as a basic printer

The protocol is undocumented but Wireshark extracts some useful bits of
info from the packet, so it was used as a reference.

1 files changed, 66 insertions, 0 deletions

diff --git a/print-msnlb.c b/print-msnlb.c
new file mode 100644
index 00000000..4c5fb0cb
--- /dev/null
+++ b/print-msnlb.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2013 Romain Francoise <romain@orebokech.com>
+ *
+ * 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.
+ * 3. Neither the name of the project 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 BY THE PROJECT 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 PROJECT 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include <stdio.h>
+#include <string.h>
+
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "extract.h"
+
+struct msnlb_heartbeat_pkt {
+	u_int32_t unknown1;
+	u_int32_t unknown2;
+	u_int32_t host_prio;	/* little-endian */
+	u_int32_t virtual_ip;
+	u_int32_t host_ip;
+	/* the protocol is undocumented so we ignore the rest */
+};
+
+void
+msnlb_print(netdissect_options *ndo, const u_char *bp, u_int length)
+{
+	const struct msnlb_heartbeat_pkt *hb;
+
+	hb = (struct msnlb_heartbeat_pkt *)bp;
+	ND_TCHECK(*hb);
+
+	ND_PRINT((ndo, "MS NLB heartbeat, host priority: %u,",
+		EXTRACT_LE_32BITS(&(hb->host_prio))));
+	ND_PRINT((ndo, " cluster IP: %s,", ipaddr_string(&(hb->virtual_ip))));
+	ND_PRINT((ndo, " host IP: %s", ipaddr_string(&(hb->host_ip))));
+	return;
+trunc:
+	ND_PRINT((ndo, "[|MS NLB]"));
+}