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 1.4 2023/08/17 20:19:40 christos 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("%s", sep); 118 sep = ", "; 119 120 opt_class = GET_BE_U_2(bp); 121 opt_type = GET_U_1(bp + 2); 122 opt_len = 4 + ((GET_U_1(bp + 3) & OPT_LEN_MASK) * 4); 123 124 ND_PRINT("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(" [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(" data"); 138 139 for (i = 4; i < opt_len; i += 4) { 140 ND_PRINT(" %08x", GET_BE_U_4(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 ndo->ndo_protocol = "geneve"; 162 ND_PRINT("Geneve"); 163 164 if (len < 8) { 165 ND_PRINT(" [length %u < 8]", len); 166 nd_print_invalid(ndo); 167 return; 168 } 169 170 ND_TCHECK_8(bp); 171 172 ver_opt = GET_U_1(bp); 173 bp += 1; 174 len -= 1; 175 176 version = ver_opt >> VER_SHIFT; 177 if (version != 0) { 178 ND_PRINT(" ERROR: unknown-version %u", version); 179 return; 180 } 181 182 flags = GET_U_1(bp); 183 bp += 1; 184 len -= 1; 185 186 prot = GET_BE_U_2(bp); 187 bp += 2; 188 len -= 2; 189 190 vni = GET_BE_U_3(bp); 191 bp += 3; 192 len -= 3; 193 194 reserved = GET_U_1(bp); 195 bp += 1; 196 len -= 1; 197 198 ND_PRINT(", Flags [%s]", 199 bittok2str_nosep(geneve_flag_values, "none", flags)); 200 ND_PRINT(", vni 0x%x", vni); 201 202 if (reserved) 203 ND_PRINT(", rsvd 0x%x", reserved); 204 205 if (ndo->ndo_eflag) 206 ND_PRINT(", proto %s (0x%04x)", 207 tok2str(ethertype_values, "unknown", prot), prot); 208 209 opts_len = (ver_opt & HDR_OPTS_LEN_MASK) * 4; 210 211 if (len < opts_len) { 212 ND_PRINT(" truncated-geneve - %u bytes missing", 213 opts_len - len); 214 return; 215 } 216 217 ND_TCHECK_LEN(bp, opts_len); 218 219 if (opts_len > 0) { 220 ND_PRINT(", options ["); 221 222 if (ndo->ndo_vflag) 223 geneve_opts_print(ndo, bp, opts_len); 224 else 225 ND_PRINT("%u bytes", opts_len); 226 227 ND_PRINT("]"); 228 } 229 230 bp += opts_len; 231 len -= opts_len; 232 233 if (ndo->ndo_vflag < 1) 234 ND_PRINT(": "); 235 else 236 ND_PRINT("\n\t"); 237 238 if (ethertype_print(ndo, prot, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL) == 0) { 239 if (prot == ETHERTYPE_TEB) 240 ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL); 241 else 242 ND_PRINT("geneve-proto-0x%x", prot); 243 } 244 245 return; 246 247 trunc: 248 nd_print_trunc(ndo); 249 } 250