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 #define NETDISSECT_REWORKED 17 #ifdef HAVE_CONFIG_H 18 #include "config.h" 19 #endif 20 21 #include <tcpdump-stdinc.h> 22 23 #include "interface.h" 24 #include "extract.h" 25 26 /* 27 * VXLAN header, RFC7348 28 * Virtual eXtensible Local Area Network (VXLAN): A Framework 29 * for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks 30 * 31 * 0 1 2 3 32 * 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 33 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 34 * |R|R|R|R|I|R|R|R| Reserved | 35 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 36 * | VXLAN Network Identifier (VNI) | Reserved | 37 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 38 */ 39 40 void 41 vxlan_print(netdissect_options *ndo, const u_char *bp, u_int len) 42 { 43 uint8_t flags; 44 uint32_t vni; 45 46 if (len < 8) { 47 ND_PRINT((ndo, "[|VXLAN]")); 48 return; 49 } 50 51 flags = *bp; 52 bp += 4; 53 54 vni = EXTRACT_24BITS(bp); 55 bp += 4; 56 57 ND_PRINT((ndo, "VXLAN, ")); 58 ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags)); 59 ND_PRINT((ndo, "vni %u\n", vni)); 60 61 ether_print(ndo, bp, len - 8, len - 8, NULL, NULL); 62 } 63