1 /*
2 * Redistribution and use in source and binary forms, with or without
3 * modification, are permitted provided that: (1) source code
4 * distributions retain the above copyright notice and this paragraph
5 * in its entirety, and (2) distributions including binary code include
6 * the above copyright notice and this paragraph in its entirety in
7 * the documentation or other materials provided with the distribution.
8 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
9 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
10 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
11 * FOR A PARTICULAR PURPOSE.
12 *
13 * Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com)
14 */
15
16 #ifdef HAVE_CONFIG_H
17 #include "config.h"
18 #endif
19
20 #include <tcpdump-stdinc.h>
21
22 #include <stdio.h>
23 #include <stdlib.h>
24
25 #include "interface.h"
26 #include "extract.h"
27 #include "addrtoname.h"
28
29 #include "udp.h"
30
31 /*
32 * VXLAN header, draft-mahalingam-dutt-dcops-vxlan-03
33 *
34 * 0 1 2 3
35 * 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
36 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
37 * |R|R|R|R|I|R|R|R| Reserved |
38 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
39 * | VXLAN Network Identifier (VNI) | Reserved |
40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
41 */
42
43 void
vxlan_print(const u_char * bp,u_int len)44 vxlan_print(const u_char *bp, u_int len)
45 {
46 u_int8_t flags;
47 u_int32_t vni;
48
49 if (len < 8) {
50 printf("[|VXLAN]");
51 return;
52 }
53
54 flags = *bp;
55 bp += 4;
56
57 vni = EXTRACT_24BITS(bp);
58 bp += 4;
59
60 printf("VXLAN, ");
61
62 fputs("flags [", stdout);
63 if (flags & 0x08)
64 fputs("I", stdout);
65 else
66 fputs(".", stdout);
67 fputs("] ", stdout);
68
69 printf("(0x%02x), ", flags);
70 printf("vni %u\n", vni);
71
72 ether_print(gndo, bp, len - 8, len - 8, NULL, NULL);
73 return;
74 }
75