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 /* \summary: Generic Protocol Extension for VXLAN (VXLAN GPE) printer */ 25 26 /* specification: draft-ietf-nvo3-vxlan-gpe-01 */ 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <netdissect-stdinc.h> 33 34 #include "netdissect.h" 35 #include "extract.h" 36 37 static const char tstr[] = " [|VXLAN-GPE]"; 38 static const struct tok vxlan_gpe_flags [] = { 39 { 0x08, "I" }, 40 { 0x04, "P" }, 41 { 0x01, "O" }, 42 { 0, NULL } 43 }; 44 45 #define VXLAN_GPE_HDR_LEN 8 46 47 /* 48 * VXLAN GPE header, draft-ietf-nvo3-vxlan-gpe-01 49 * Generic Protocol Extension for VXLAN 50 * 51 * 0 1 2 3 52 * 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 53 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 54 * |R|R|Ver|I|P|R|O| Reserved |Next Protocol | 55 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 56 * | VXLAN Network Identifier (VNI) | Reserved | 57 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 58 */ 59 60 void 61 vxlan_gpe_print(netdissect_options *ndo, const u_char *bp, u_int len) 62 { 63 uint8_t flags; 64 uint8_t next_protocol; 65 uint32_t vni; 66 67 if (len < VXLAN_GPE_HDR_LEN) 68 goto trunc; 69 70 ND_TCHECK2(*bp, VXLAN_GPE_HDR_LEN); 71 72 flags = *bp; 73 bp += 3; 74 75 next_protocol = *bp; 76 bp += 1; 77 78 vni = EXTRACT_24BITS(bp); 79 bp += 4; 80 81 ND_PRINT((ndo, "VXLAN-GPE, ")); 82 ND_PRINT((ndo, "flags [%s], ", 83 bittok2str_nosep(vxlan_gpe_flags, "none", flags))); 84 ND_PRINT((ndo, "vni %u", vni)); 85 ND_PRINT((ndo, ndo->ndo_vflag ? "\n " : ": ")); 86 87 switch (next_protocol) { 88 case 0x1: 89 ip_print(ndo, bp, len - 8); 90 break; 91 case 0x2: 92 ip6_print(ndo, bp, len - 8); 93 break; 94 case 0x3: 95 ether_print(ndo, bp, len - 8, ndo->ndo_snapend - bp, NULL, NULL); 96 break; 97 case 0x4: 98 nsh_print(ndo, bp, len - 8); 99 break; 100 case 0x5: 101 mpls_print(ndo, bp, len - 8); 102 break; 103 default: 104 ND_PRINT((ndo, "ERROR: unknown-next-protocol")); 105 return; 106 } 107 108 return; 109 110 trunc: 111 ND_PRINT((ndo, "%s", tstr)); 112 } 113 114