From: Francesco Fondelli <francesco.fondelli@gmail.com>
Date: Mon, 25 Feb 2013 16:56:44 +0000 (+0100)
Subject: Add support for VXLAN (draft-mahalingam-dutt-dcops-vxlan-03)
X-Git-Tag: tcpdump-4.4.0^2~2^2~2
X-Git-Url: https://git.tcpdump.org/tcpdump/commitdiff_plain/769d730e80f9f6c0cac9e4948e5f8225b079d27b

Add support for VXLAN (draft-mahalingam-dutt-dcops-vxlan-03)
---

diff --git a/Makefile.in b/Makefile.in
index 06ff410d..89597574 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -93,7 +93,7 @@ CSRC =	addrtoname.c af.c checksum.c cpack.c gmpls.c oui.c gmt2local.c ipproto.c
 	print-symantec.c print-syslog.c print-tcp.c print-telnet.c print-tftp.c \
 	print-timed.c print-tipc.c print-token.c print-udld.c print-udp.c \
 	print-usb.c print-vjc.c print-vqp.c print-vrrp.c print-vtp.c \
-	print-wb.c print-zephyr.c print-zeromq.c signature.c setsignal.c tcpdump.c util.c
+	print-wb.c print-zephyr.c print-zeromq.c print-vxlan.c signature.c setsignal.c tcpdump.c util.c
 
 LIBNETDISSECT_SRC=print-isakmp.c
 LIBNETDISSECT_OBJ=$(LIBNETDISSECT_SRC:.c=.o)
diff --git a/print-udp.c b/print-udp.c
index e321f218..00f73f79 100644
--- a/print-udp.c
+++ b/print-udp.c
@@ -663,6 +663,8 @@ udp_print(register const u_char *bp, u_int length,
 			sip_print((const u_char *)(up + 1), length);
                 else if (ISPORT(SYSLOG_PORT))
 			syslog_print((const u_char *)(up + 1), length);
+                else if (ISPORT(VXLAN_PORT))
+			vxlan_print((const u_char *)(up + 1), length);
 		else
 			(void)printf("UDP, length %u",
 			    (u_int32_t)(ulen - sizeof(*up)));
diff --git a/print-vxlan.c b/print-vxlan.c
new file mode 100644
index 00000000..2e5433e3
--- /dev/null
+++ b/print-vxlan.c
@@ -0,0 +1,75 @@
+/*
+ * 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.
+ * 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.
+ *
+ * Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com)
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "interface.h"
+#include "extract.h"
+#include "addrtoname.h"
+
+#include "udp.h"
+
+/*
+ * VXLAN header, draft-mahalingam-dutt-dcops-vxlan-03
+ *
+ *     0                   1                   2                   3
+ *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |R|R|R|R|I|R|R|R|            Reserved                           |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |                VXLAN Network Identifier (VNI) |   Reserved    |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
+ */
+
+void
+vxlan_print(const u_char *bp, u_int len, u_int port)
+{
+    u_int8_t flags;
+    u_int32_t vni;
+    
+    if (len < 8) {
+        printf("[|VXLAN]");
+        return;
+    }
+
+    flags = *bp;
+    bp += 4;
+
+    vni = EXTRACT_24BITS(bp);
+    bp += 4;
+
+    printf("VXLAN, ");
+
+    fputs("flags [", stdout);
+    if (flags & 0x08)
+        fputs("I", stdout);
+    else
+        fputs(".", stdout);
+    fputs("] ", stdout);
+
+    printf("(0x%02x), ", flags);
+    printf("vni %u\n", vni);
+
+    ether_print(gndo, bp, len - 8, len - 8, NULL, NULL);
+    return;
+}
diff --git a/udp.h b/udp.h
index ad1d8506..f9f67ee8 100644
--- a/udp.h
+++ b/udp.h
@@ -85,6 +85,7 @@ struct udphdr {
 #define SFLOW_PORT              6343 /* http://www.sflow.org/developers/specifications.php */
 #define LWAPP_DATA_PORT         12222 /* draft-ohara-capwap-lwapp-04.txt */
 #define LWAPP_CONTROL_PORT      12223 /* draft-ohara-capwap-lwapp-04.txt */
+#define VXLAN_PORT              8472  /* draft-mahalingam-dutt-dcops-vxlan-03 */
 
 #ifdef INET6
 #define RIPNG_PORT 521		/*XXX*/