1 /* 2 * Copyright (c) 2014 VMware, Inc. All Rights Reserved. 3 * 4 * Jesse Gross <jesse (at) 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 1.5 2024/09/02 16:15:31 christos Exp $"); 21 #endif 22 23 /* \summary: Generic Network Virtualization Encapsulation (Geneve) printer */ 24 25 #include <config.h> 26 27 #include "netdissect-stdinc.h" 28 29 #include "netdissect.h" 30 #include "extract.h" 31 #include "ethertype.h" 32 33 /* 34 * Geneve header, draft-ietf-nvo3-geneve 35 * 36 * 0 1 2 3 37 * 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 38 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 39 * |Ver| Opt Len |O|C| Rsvd. | Protocol Type | 40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 41 * | Virtual Network Identifier (VNI) | Reserved | 42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 43 * | Variable Length Options | 44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 45 * 46 * Options: 47 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 48 * | Option Class | Type |R|R|R| Length | 49 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 50 * | Variable Option Data | 51 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 52 */ 53 54 #define VER_SHIFT 6 55 #define HDR_OPTS_LEN_MASK 0x3F 56 57 #define FLAG_OAM (1 << 7) 58 #define FLAG_CRITICAL (1 << 6) 59 #define FLAG_R1 (1 << 5) 60 #define FLAG_R2 (1 << 4) 61 #define FLAG_R3 (1 << 3) 62 #define FLAG_R4 (1 << 2) 63 #define FLAG_R5 (1 << 1) 64 #define FLAG_R6 (1 << 0) 65 66 #define OPT_TYPE_CRITICAL (1 << 7) 67 #define OPT_LEN_MASK 0x1F 68 69 static const struct tok geneve_flag_values[] = { 70 { FLAG_OAM, "O" }, 71 { FLAG_CRITICAL, "C" }, 72 { FLAG_R1, "R1" }, 73 { FLAG_R2, "R2" }, 74 { FLAG_R3, "R3" }, 75 { FLAG_R4, "R4" }, 76 { FLAG_R5, "R5" }, 77 { FLAG_R6, "R6" }, 78 { 0, NULL } 79 }; 80 81 static const char * 82 format_opt_class(uint16_t opt_class) 83 { 84 switch (opt_class) { 85 case 0x0100: 86 return "Linux"; 87 case 0x0101: 88 return "Open vSwitch"; 89 case 0x0102: 90 return "Open Virtual Networking (OVN)"; 91 case 0x0103: 92 return "In-band Network Telemetry (INT)"; 93 case 0x0104: 94 return "VMware"; 95 default: 96 if (opt_class <= 0x00ff) 97 return "Standard"; 98 else if (opt_class >= 0xfff0) 99 return "Experimental"; 100 } 101 102 return "Unknown"; 103 } 104 105 static void 106 geneve_opts_print(netdissect_options *ndo, const u_char *bp, u_int len) 107 { 108 const char *sep = ""; 109 110 while (len > 0) { 111 uint16_t opt_class; 112 uint8_t opt_type; 113 uint8_t opt_len; 114 115 ND_PRINT("%s", sep); 116 sep = ", "; 117 118 opt_class = GET_BE_U_2(bp); 119 opt_type = GET_U_1(bp + 2); 120 opt_len = 4 + ((GET_U_1(bp + 3) & OPT_LEN_MASK) * 4); 121 122 ND_PRINT("class %s (0x%x) type 0x%x%s len %u", 123 format_opt_class(opt_class), opt_class, opt_type, 124 opt_type & OPT_TYPE_CRITICAL ? "(C)" : "", opt_len); 125 126 if (opt_len > len) { 127 ND_PRINT(" [bad length]"); 128 return; 129 } 130 131 if (ndo->ndo_vflag > 1 && opt_len > 4) { 132 const uint32_t *data = (const uint32_t *)(bp + 4); 133 int i; 134 135 ND_PRINT(" data"); 136 137 for (i = 4; i < opt_len; i += 4) { 138 ND_PRINT(" %08x", GET_BE_U_4(data)); 139 data++; 140 } 141 } 142 143 bp += opt_len; 144 len -= opt_len; 145 } 146 } 147 148 void 149 geneve_print(netdissect_options *ndo, const u_char *bp, u_int len) 150 { 151 uint8_t ver_opt; 152 u_int version; 153 uint8_t flags; 154 uint16_t prot; 155 uint32_t vni; 156 uint8_t reserved; 157 u_int opts_len; 158 159 ndo->ndo_protocol = "geneve"; 160 ND_PRINT("Geneve"); 161 162 if (len < 8) { 163 ND_PRINT(" [length %u < 8]", len); 164 nd_print_invalid(ndo); 165 return; 166 } 167 168 ND_TCHECK_8(bp); 169 170 ver_opt = GET_U_1(bp); 171 bp += 1; 172 len -= 1; 173 174 version = ver_opt >> VER_SHIFT; 175 if (version != 0) { 176 ND_PRINT(" ERROR: unknown-version %u", version); 177 return; 178 } 179 180 flags = GET_U_1(bp); 181 bp += 1; 182 len -= 1; 183 184 prot = GET_BE_U_2(bp); 185 bp += 2; 186 len -= 2; 187 188 vni = GET_BE_U_3(bp); 189 bp += 3; 190 len -= 3; 191 192 reserved = GET_U_1(bp); 193 bp += 1; 194 len -= 1; 195 196 ND_PRINT(", Flags [%s]", 197 bittok2str_nosep(geneve_flag_values, "none", flags)); 198 ND_PRINT(", vni 0x%x", vni); 199 200 if (reserved) 201 ND_PRINT(", rsvd 0x%x", reserved); 202 203 if (ndo->ndo_eflag) 204 ND_PRINT(", proto %s (0x%04x)", 205 tok2str(ethertype_values, "unknown", prot), prot); 206 207 opts_len = (ver_opt & HDR_OPTS_LEN_MASK) * 4; 208 209 if (len < opts_len) { 210 ND_PRINT(" truncated-geneve - %u bytes missing", 211 opts_len - len); 212 return; 213 } 214 215 ND_TCHECK_LEN(bp, opts_len); 216 217 if (opts_len > 0) { 218 ND_PRINT(", options ["); 219 220 if (ndo->ndo_vflag) 221 geneve_opts_print(ndo, bp, opts_len); 222 else 223 ND_PRINT("%u bytes", opts_len); 224 225 ND_PRINT("]"); 226 } 227 228 bp += opts_len; 229 len -= opts_len; 230 231 if (ndo->ndo_vflag < 1) 232 ND_PRINT(": "); 233 else 234 ND_PRINT("\n\t"); 235 236 if (ethertype_print(ndo, prot, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL) == 0) { 237 if (prot == ETHERTYPE_TEB) 238 ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL); 239 else 240 ND_PRINT("geneve-proto-0x%x", prot); 241 } 242 243 return; 244 245 trunc: 246 nd_print_trunc(ndo); 247 } 248
Indexes created Fri Oct 02 00:25:19 UTC 2026