1 /* Copyright (c) 2015, bugyo 2 * All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 1. Redistributions of source code must retain the above copyright notice, 7 * this list of conditions and the following disclaimer. 8 * 2. Redistributions in binary form must reproduce the above copyright notice, 9 * this list of conditions and the following disclaimer in the documentation 10 * and/or other materials provided with the distribution. 11 * 12 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 13 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 14 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 15 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 16 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 17 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 18 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 19 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 20 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 21 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 22 */ 23 24 #include <sys/cdefs.h> 25 #ifndef lint 26 __RCSID("$NetBSD: print-vxlan-gpe.c,v 1.3 2017/02/05 04:05:05 spz Exp $"); 27 #endif 28 29 /* \summary: Generic Protocol Extension for VXLAN (VXLAN GPE) printer */ 30 31 /* specification: draft-ietf-nvo3-vxlan-gpe-01 */ 32 33 #ifdef HAVE_CONFIG_H 34 #include "config.h" 35 #endif 36 37 #include <netdissect-stdinc.h> 38 39 #include "netdissect.h" 40 #include "extract.h" 41 42 static const char tstr[] = " [|VXLAN-GPE]"; 43 static const struct tok vxlan_gpe_flags [] = { 44 { 0x08, "I" }, 45 { 0x04, "P" }, 46 { 0x01, "O" }, 47 { 0, NULL } 48 }; 49 50 #define VXLAN_GPE_HDR_LEN 8 51 52 /* 53 * VXLAN GPE header, draft-ietf-nvo3-vxlan-gpe-01 54 * Generic Protocol Extension for VXLAN 55 * 56 * 0 1 2 3 57 * 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 58 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 59 * |R|R|Ver|I|P|R|O| Reserved |Next Protocol | 60 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 61 * | VXLAN Network Identifier (VNI) | Reserved | 62 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 63 */ 64 65 void 66 vxlan_gpe_print(netdissect_options *ndo, const u_char *bp, u_int len) 67 { 68 uint8_t flags; 69 uint8_t next_protocol; 70 uint32_t vni; 71 72 if (len < VXLAN_GPE_HDR_LEN) 73 goto trunc; 74 75 ND_TCHECK2(*bp, VXLAN_GPE_HDR_LEN); 76 77 flags = *bp; 78 bp += 3; 79 80 next_protocol = *bp; 81 bp += 1; 82 83 vni = EXTRACT_24BITS(bp); 84 bp += 4; 85 86 ND_PRINT((ndo, "VXLAN-GPE, ")); 87 ND_PRINT((ndo, "flags [%s], ", 88 bittok2str_nosep(vxlan_gpe_flags, "none", flags))); 89 ND_PRINT((ndo, "vni %u", vni)); 90 ND_PRINT((ndo, ndo->ndo_vflag ? "\n " : ": ")); 91 92 switch (next_protocol) { 93 case 0x1: 94 ip_print(ndo, bp, len - 8); 95 break; 96 case 0x2: 97 ip6_print(ndo, bp, len - 8); 98 break; 99 case 0x3: 100 ether_print(ndo, bp, len - 8, ndo->ndo_snapend - bp, NULL, NULL); 101 break; 102 case 0x4: 103 nsh_print(ndo, bp, len - 8); 104 break; 105 case 0x5: 106 mpls_print(ndo, bp, len - 8); 107 break; 108 default: 109 ND_PRINT((ndo, "ERROR: unknown-next-protocol")); 110 return; 111 } 112 113 return; 114 115 trunc: 116 ND_PRINT((ndo, "%s", tstr)); 117 } 118 119