1 /* 2 * Copyright (c) 2014 VMware, Inc. All Rights Reserved. 3 * 4 * Jesse Gross <jesse@nicira.com> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that: (1) source code 8 * distributions retain the above copyright notice and this paragraph 9 * in its entirety, and (2) distributions including binary code include 10 * the above copyright notice and this paragraph in its entirety in 11 * the documentation or other materials provided with the distribution. 12 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND 13 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 14 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 15 * FOR A PARTICULAR PURPOSE. 16 */ 17 18 #include <sys/cdefs.h> 19 #ifndef lint 20 __RCSID("$NetBSD: print-geneve.c,v 1.3 2017/02/05 04:05:05 spz Exp $"); 21 #endif 22 23 /* \summary: Generic Network Virtualization Encapsulation (Geneve) printer */ 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 #include "ethertype.h" 34 35 /* 36 * Geneve header, draft-ietf-nvo3-geneve 37 * 38 * 0 1 2 3 39 * 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 40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 41 * |Ver| Opt Len |O|C| Rsvd. | Protocol Type | 42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 43 * | Virtual Network Identifier (VNI) | Reserved | 44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 45 * | Variable Length Options | 46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 47 * 48 * Options: 49 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 50 * | Option Class | Type |R|R|R| Length | 51 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 52 * | Variable Option Data | 53 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 54 */ 55 56 #define VER_SHIFT 6 57 #define HDR_OPTS_LEN_MASK 0x3F 58 59 #define FLAG_OAM (1 << 7) 60 #define FLAG_CRITICAL (1 << 6) 61 #define FLAG_R1 (1 << 5) 62 #define FLAG_R2 (1 << 4) 63 #define FLAG_R3 (1 << 3) 64 #define FLAG_R4 (1 << 2) 65 #define FLAG_R5 (1 << 1) 66 #define FLAG_R6 (1 << 0) 67 68 #define OPT_TYPE_CRITICAL (1 << 7) 69 #define OPT_LEN_MASK 0x1F 70 71 static const struct tok geneve_flag_values[] = { 72 { FLAG_OAM, "O" }, 73 { FLAG_CRITICAL, "C" }, 74 { FLAG_R1, "R1" }, 75 { FLAG_R2, "R2" }, 76 { FLAG_R3, "R3" }, 77 { FLAG_R4, "R4" }, 78 { FLAG_R5, "R5" }, 79 { FLAG_R6, "R6" }, 80 { 0, NULL } 81 }; 82 83 static const char * 84 format_opt_class(uint16_t opt_class) 85 { 86 switch (opt_class) { 87 case 0x0100: 88 return "Linux"; 89 case 0x0101: 90 return "Open vSwitch"; 91 case 0x0102: 92 return "Open Virtual Networking (OVN)"; 93 case 0x0103: 94 return "In-band Network Telemetry (INT)"; 95 case 0x0104: 96 return "VMware"; 97 default: 98 if (opt_class <= 0x00ff) 99 return "Standard"; 100 else if (opt_class >= 0xfff0) 101 return "Experimental"; 102 } 103 104 return "Unknown"; 105 } 106 107 static void 108 geneve_opts_print(netdissect_options *ndo, const u_char *bp, u_int len) 109 { 110 const char *sep = ""; 111 112 while (len > 0) { 113 uint16_t opt_class; 114 uint8_t opt_type; 115 uint8_t opt_len; 116 117 ND_PRINT((ndo, "%s", sep)); 118 sep = ", "; 119 120 opt_class = EXTRACT_16BITS(bp); 121 opt_type = *(bp + 2); 122 opt_len = 4 + ((*(bp + 3) & OPT_LEN_MASK) * 4); 123 124 ND_PRINT((ndo, "class %s (0x%x) type 0x%x%s len %u", 125 format_opt_class(opt_class), opt_class, opt_type, 126 opt_type & OPT_TYPE_CRITICAL ? "(C)" : "", opt_len)); 127 128 if (opt_len > len) { 129 ND_PRINT((ndo, " [bad length]")); 130 return; 131 } 132 133 if (ndo->ndo_vflag > 1 && opt_len > 4) { 134 const uint32_t *data = (const uint32_t *)(bp + 4); 135 int i; 136 137 ND_PRINT((ndo, " data")); 138 139 for (i = 4; i < opt_len; i += 4) { 140 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(data))); 141 data++; 142 } 143 } 144 145 bp += opt_len; 146 len -= opt_len; 147 } 148 } 149 150 void 151 geneve_print(netdissect_options *ndo, const u_char *bp, u_int len) 152 { 153 uint8_t ver_opt; 154 u_int version; 155 uint8_t flags; 156 uint16_t prot; 157 uint32_t vni; 158 uint8_t reserved; 159 u_int opts_len; 160 161 ND_PRINT((ndo, "Geneve")); 162 163 ND_TCHECK2(*bp, 8); 164 165 ver_opt = *bp; 166 bp += 1; 167 len -= 1; 168 169 version = ver_opt >> VER_SHIFT; 170 if (version != 0) { 171 ND_PRINT((ndo, " ERROR: unknown-version %u", version)); 172 return; 173 } 174 175 flags = *bp; 176 bp += 1; 177 len -= 1; 178 179 prot = EXTRACT_16BITS(bp); 180 bp += 2; 181 len -= 2; 182 183 vni = EXTRACT_24BITS(bp); 184 bp += 3; 185 len -= 3; 186 187 reserved = *bp; 188 bp += 1; 189 len -= 1; 190 191 ND_PRINT((ndo, ", Flags [%s]", 192 bittok2str_nosep(geneve_flag_values, "none", flags))); 193 ND_PRINT((ndo, ", vni 0x%x", vni)); 194 195 if (reserved) 196 ND_PRINT((ndo, ", rsvd 0x%x", reserved)); 197 198 if (ndo->ndo_eflag) 199 ND_PRINT((ndo, ", proto %s (0x%04x)", 200 tok2str(ethertype_values, "unknown", prot), prot)); 201 202 opts_len = (ver_opt & HDR_OPTS_LEN_MASK) * 4; 203 204 if (len < opts_len) { 205 ND_PRINT((ndo, " truncated-geneve - %u bytes missing", 206 opts_len - len)); 207 return; 208 } 209 210 ND_TCHECK2(*bp, opts_len); 211 212 if (opts_len > 0) { 213 ND_PRINT((ndo, ", options [")); 214 215 if (ndo->ndo_vflag) 216 geneve_opts_print(ndo, bp, opts_len); 217 else 218 ND_PRINT((ndo, "%u bytes", opts_len)); 219 220 ND_PRINT((ndo, "]")); 221 } 222 223 bp += opts_len; 224 len -= opts_len; 225 226 if (ndo->ndo_vflag < 1) 227 ND_PRINT((ndo, ": ")); 228 else 229 ND_PRINT((ndo, "\n\t")); 230 231 if (ethertype_print(ndo, prot, bp, len, ndo->ndo_snapend - bp, NULL, NULL) == 0) { 232 if (prot == ETHERTYPE_TEB) 233 ether_print(ndo, bp, len, ndo->ndo_snapend - bp, NULL, NULL); 234 else 235 ND_PRINT((ndo, "geneve-proto-0x%x", prot)); 236 } 237 238 return; 239 240 trunc: 241 ND_PRINT((ndo, " [|geneve]")); 242 } 243