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 #include <sys/cdefs.h> 17 #ifndef lint 18 __RCSID("$NetBSD: print-vxlan.c,v 1.3 2017/02/05 04:05:05 spz Exp $"); 19 #endif 20 21 /* \summary: Virtual eXtensible Local Area Network (VXLAN) printer */ 22 23 /* specification: RFC 7348 */ 24 25 #ifdef HAVE_CONFIG_H 26 #include "config.h" 27 #endif 28 29 #include <netdissect-stdinc.h> 30 31 #include "netdissect.h" 32 #include "extract.h" 33 34 static const char tstr[] = " [|VXLAN]"; 35 36 #define VXLAN_HDR_LEN 8 37 38 /* 39 * VXLAN header, RFC7348 40 * Virtual eXtensible Local Area Network (VXLAN): A Framework 41 * for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks 42 * 43 * 0 1 2 3 44 * 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 45 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 46 * |R|R|R|R|I|R|R|R| Reserved | 47 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 48 * | VXLAN Network Identifier (VNI) | Reserved | 49 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 50 */ 51 52 void 53 vxlan_print(netdissect_options *ndo, const u_char *bp, u_int len) 54 { 55 uint8_t flags; 56 uint32_t vni; 57 58 if (len < VXLAN_HDR_LEN) 59 goto trunc; 60 61 ND_TCHECK2(*bp, VXLAN_HDR_LEN); 62 63 flags = *bp; 64 bp += 4; 65 66 vni = EXTRACT_24BITS(bp); 67 bp += 4; 68 69 ND_PRINT((ndo, "VXLAN, ")); 70 ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags)); 71 ND_PRINT((ndo, "vni %u\n", vni)); 72 73 ether_print(ndo, bp, len - VXLAN_HDR_LEN, ndo->ndo_snapend - bp, NULL, NULL); 74 75 return; 76 77 trunc: 78 ND_PRINT((ndo, "%s", tstr)); 79 } 80