Merge pull request #54 from ffatghub/master

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

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 print-otv.c signature.c setsignal.c tcpdump.c util.c
 
 LIBNETDISSECT_SRC=print-isakmp.c
 LIBNETDISSECT_OBJ=$(LIBNETDISSECT_SRC:.c=.o)

interface.h

@@ -73,6 +73,7 @@ extern char *strsep(char **, const char *);
 #define PT_CARP		10	/* Common Address Redundancy Protocol */
 #define PT_RADIUS	11	/* RADIUS authentication Protocol */
 #define PT_ZMTP1	12	/* ZeroMQ Message Transport Protocol 1.0 */
+#define PT_VXLAN	13	/* Virtual eXtensible Local Area Network */
 
 #ifndef min
 #define min(a,b) ((a)>(b)?(b):(a))

netdissect.h

@@ -182,6 +182,7 @@ struct netdissect_options {
 #define PT_CARP		10	/* Common Address Redundancy Protocol */
 #define PT_RADIUS	11	/* RADIUS authentication Protocol */
 #define PT_ZMTP1	12	/* ZeroMQ Message Transport Protocol 1.0 */
+#define PT_VXLAN	13	/* Virtual eXtensible Local Area Network */
 
 #ifndef min
 #define min(a,b) ((a)>(b)?(b):(a))

print-otv.c

@@ -0,0 +1,79 @@
+/*
+ * 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"
+
+/*
+ * OTV header, draft-hasmit-otv-04
+ *
+ *     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|           Overlay ID                          |
+ *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *     |          Instance ID                          | Reserved      |
+ *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+void
+otv_print(const u_char *bp, u_int len, u_int port)
+{
+    u_int8_t flags;
+    u_int32_t overlay_id;
+    u_int32_t instance_id;
+
+    if (len < 8) {
+        printf("[|OTV]");
+        return;
+    }
+
+    flags = *bp;
+    bp += 1;
+
+    overlay_id = EXTRACT_24BITS(bp);
+    bp += 3;
+
+    instance_id = EXTRACT_24BITS(bp);
+    bp += 4;
+
+    printf("OTV, ");
+
+    fputs("flags [", stdout);
+    if (flags & 0x08)
+        fputs("I", stdout);
+    else
+        fputs(".", stdout);
+    fputs("] ", stdout);
+
+    printf("(0x%02x), ", flags);
+    printf("overlay %u, ", overlay_id);
+    printf("instance %u\n", instance_id);
+
+    ether_print(gndo, bp, len - 8, len - 8, NULL, NULL);
+    return;
+}

print-udp.c

@@ -474,6 +474,11 @@ udp_print(register const u_char *bp, u_int length,
 			udpipaddr_print(ip, sport, dport);
 			radius_print(cp, length);
 			break;
+
+		case PT_VXLAN:
+			udpipaddr_print(ip, sport, dport);
+			vxlan_print((const u_char *)(up + 1), length);
+			break;
 		}
 		return;
 	}
@@ -663,6 +668,8 @@ 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(OTV_PORT))
+			otv_print((const u_char *)(up + 1), length);
 		else
 			(void)printf("UDP, length %u",
 			    (u_int32_t)(ulen - sizeof(*up)));

print-vxlan.c

@@ -0,0 +1,74 @@
+/*
+ * 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;
+}

tcpdump.1.in

@@ -527,8 +527,9 @@ Currently known types are
 \fBtftp\fR (Trivial File Transfer Protocol),
 \fBvat\fR (Visual Audio Tool),
 \fBwb\fR (distributed White Board),
+\fBzmtp1\fR (ZeroMQ Message Transport Protocol 1.0)
 and
-\fBzmtp1\fR (ZeroMQ Message Transport Protocol 1.0).
+\fBvxlan\fR (Virtual eXtensible Local Area Network).
 .TP
 .B \-t
 \fIDon't\fP print a timestamp on each dump line.

tcpdump.c

@@ -1013,6 +1013,8 @@ main(int argc, char **argv)
 				packettype = PT_RADIUS;
 			else if (strcasecmp(optarg, "zmtp1") == 0)
 				packettype = PT_ZMTP1;
+			else if (strcasecmp(optarg, "vxlan") == 0)
+				packettype = PT_VXLAN;
 			else
 				error("unknown packet type `%s'", optarg);
 			break;

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 OTV_PORT                8472  /* draft-hasmit-otv-04 */
 
 #ifdef INET6
 #define RIPNG_PORT 521		/*XXX*/