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 1.4 2023/08/17 20:19:40 christos Exp $"); 27 #endif 28 29 /* \summary: Generic Protocol Extension for VXLAN (VXLAN GPE) printer */ 30 31 /* specification: draft-ietf-nvo3-vxlan-gpe-10 */ 32 33 #ifdef HAVE_CONFIG_H 34 #include <config.h> 35 #endif 36 37 #include "netdissect-stdinc.h" 38 39 #define ND_LONGJMP_FROM_TCHECK 40 #include "netdissect.h" 41 #include "extract.h" 42 43 static const struct tok vxlan_gpe_flags [] = { 44 { 0x08, "I" }, 45 { 0x04, "P" }, 46 { 0x02, "B" }, 47 { 0x01, "O" }, 48 { 0, NULL } 49 }; 50 51 #define VXLAN_GPE_HDR_LEN 8 52 53 /* 54 * VXLAN GPE header, draft-ietf-nvo3-vxlan-gpe-01 55 * Generic Protocol Extension for VXLAN 56 * 57 * 0 1 2 3 58 * 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 59 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 60 * |R|R|Ver|I|P|R|O| Reserved |Next Protocol | 61 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 62 * | VXLAN Network Identifier (VNI) | Reserved | 63 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 64 */ 65 66 void 67 vxlan_gpe_print(netdissect_options *ndo, const u_char *bp, u_int len) 68 { 69 uint8_t flags; 70 uint8_t next_protocol; 71 uint32_t vni; 72 73 ndo->ndo_protocol = "vxlan_gpe"; 74 ND_PRINT("VXLAN-GPE, "); 75 if (len < VXLAN_GPE_HDR_LEN) { 76 ND_PRINT(" (len %u < %u)", len, VXLAN_GPE_HDR_LEN); 77 goto invalid; 78 } 79 80 flags = GET_U_1(bp); 81 bp += 1; 82 len -= 1; 83 ND_PRINT("flags [%s], ", 84 bittok2str_nosep(vxlan_gpe_flags, "none", flags)); 85 86 /* Reserved */ 87 bp += 2; 88 len -= 2; 89 90 next_protocol = GET_U_1(bp); 91 bp += 1; 92 len -= 1; 93 94 vni = GET_BE_U_3(bp); 95 bp += 3; 96 len -= 3; 97 98 /* Reserved */ 99 ND_TCHECK_1(bp); 100 bp += 1; 101 len -= 1; 102 103 ND_PRINT("vni %u", vni); 104 ND_PRINT(ndo->ndo_vflag ? "\n " : ": "); 105 106 switch (next_protocol) { 107 case 0x1: 108 ip_print(ndo, bp, len); 109 break; 110 case 0x2: 111 ip6_print(ndo, bp, len); 112 break; 113 case 0x3: 114 ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL); 115 break; 116 case 0x4: 117 nsh_print(ndo, bp, len); 118 break; 119 default: 120 ND_PRINT("ERROR: unknown-next-protocol"); 121 goto invalid; 122 } 123 124 return; 125 126 invalid: 127 nd_print_invalid(ndo); 128 } 129 130