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 /* \summary: Generic Network Virtualization Encapsulation (Geneve) printer */ 19 20 #include <config.h> 21 22 #include "netdissect-stdinc.h" 23 24 #include "netdissect.h" 25 #include "extract.h" 26 #include "ethertype.h" 27 28 /* 29 * Geneve header, draft-ietf-nvo3-geneve 30 * 31 * 0 1 2 3 32 * 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 33 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 34 * |Ver| Opt Len |O|C| Rsvd. | Protocol Type | 35 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 36 * | Virtual Network Identifier (VNI) | Reserved | 37 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 38 * | Variable Length Options | 39 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 40 * 41 * Options: 42 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 43 * | Option Class | Type |R|R|R| Length | 44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 45 * | Variable Option Data | 46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 47 */ 48 49 #define VER_SHIFT 6 50 #define HDR_OPTS_LEN_MASK 0x3F 51 52 #define FLAG_OAM (1 << 7) 53 #define FLAG_CRITICAL (1 << 6) 54 #define FLAG_R1 (1 << 5) 55 #define FLAG_R2 (1 << 4) 56 #define FLAG_R3 (1 << 3) 57 #define FLAG_R4 (1 << 2) 58 #define FLAG_R5 (1 << 1) 59 #define FLAG_R6 (1 << 0) 60 61 #define OPT_TYPE_CRITICAL (1 << 7) 62 #define OPT_LEN_MASK 0x1F 63 64 static const struct tok geneve_flag_values[] = { 65 { FLAG_OAM, "O" }, 66 { FLAG_CRITICAL, "C" }, 67 { FLAG_R1, "R1" }, 68 { FLAG_R2, "R2" }, 69 { FLAG_R3, "R3" }, 70 { FLAG_R4, "R4" }, 71 { FLAG_R5, "R5" }, 72 { FLAG_R6, "R6" }, 73 { 0, NULL } 74 }; 75 76 static const char * 77 format_opt_class(uint16_t opt_class) 78 { 79 switch (opt_class) { 80 case 0x0100: 81 return "Linux"; 82 case 0x0101: 83 return "Open vSwitch"; 84 case 0x0102: 85 return "Open Virtual Networking (OVN)"; 86 case 0x0103: 87 return "In-band Network Telemetry (INT)"; 88 case 0x0104: 89 return "VMware"; 90 default: 91 if (opt_class <= 0x00ff) 92 return "Standard"; 93 else if (opt_class >= 0xfff0) 94 return "Experimental"; 95 } 96 97 return "Unknown"; 98 } 99 100 static void 101 geneve_opts_print(netdissect_options *ndo, const u_char *bp, u_int len) 102 { 103 const char *sep = ""; 104 105 while (len > 0) { 106 uint16_t opt_class; 107 uint8_t opt_type; 108 uint8_t opt_len; 109 110 ND_PRINT("%s", sep); 111 sep = ", "; 112 113 opt_class = GET_BE_U_2(bp); 114 opt_type = GET_U_1(bp + 2); 115 opt_len = 4 + ((GET_U_1(bp + 3) & OPT_LEN_MASK) * 4); 116 117 ND_PRINT("class %s (0x%x) type 0x%x%s len %u", 118 format_opt_class(opt_class), opt_class, opt_type, 119 opt_type & OPT_TYPE_CRITICAL ? "(C)" : "", opt_len); 120 121 if (opt_len > len) { 122 ND_PRINT(" [bad length]"); 123 return; 124 } 125 126 if (ndo->ndo_vflag > 1 && opt_len > 4) { 127 const uint32_t *data = (const uint32_t *)(bp + 4); 128 int i; 129 130 ND_PRINT(" data"); 131 132 for (i = 4; i < opt_len; i += 4) { 133 ND_PRINT(" %08x", GET_BE_U_4(data)); 134 data++; 135 } 136 } 137 138 bp += opt_len; 139 len -= opt_len; 140 } 141 } 142 143 void 144 geneve_print(netdissect_options *ndo, const u_char *bp, u_int len) 145 { 146 uint8_t ver_opt; 147 u_int version; 148 uint8_t flags; 149 uint16_t prot; 150 uint32_t vni; 151 uint8_t reserved; 152 u_int opts_len; 153 154 ndo->ndo_protocol = "geneve"; 155 ND_PRINT("Geneve"); 156 157 if (len < 8) { 158 ND_PRINT(" [length %u < 8]", len); 159 nd_print_invalid(ndo); 160 return; 161 } 162 163 ND_TCHECK_8(bp); 164 165 ver_opt = GET_U_1(bp); 166 bp += 1; 167 len -= 1; 168 169 version = ver_opt >> VER_SHIFT; 170 if (version != 0) { 171 ND_PRINT(" ERROR: unknown-version %u", version); 172 return; 173 } 174 175 flags = GET_U_1(bp); 176 bp += 1; 177 len -= 1; 178 179 prot = GET_BE_U_2(bp); 180 bp += 2; 181 len -= 2; 182 183 vni = GET_BE_U_3(bp); 184 bp += 3; 185 len -= 3; 186 187 reserved = GET_U_1(bp); 188 bp += 1; 189 len -= 1; 190 191 ND_PRINT(", Flags [%s]", 192 bittok2str_nosep(geneve_flag_values, "none", flags)); 193 ND_PRINT(", vni 0x%x", vni); 194 195 if (reserved) 196 ND_PRINT(", rsvd 0x%x", reserved); 197 198 if (ndo->ndo_eflag) 199 ND_PRINT(", 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(" truncated-geneve - %u bytes missing", 206 opts_len - len); 207 return; 208 } 209 210 ND_TCHECK_LEN(bp, opts_len); 211 212 if (opts_len > 0) { 213 ND_PRINT(", options ["); 214 215 if (ndo->ndo_vflag) 216 geneve_opts_print(ndo, bp, opts_len); 217 else 218 ND_PRINT("%u bytes", opts_len); 219 220 ND_PRINT("]"); 221 } 222 223 bp += opts_len; 224 len -= opts_len; 225 226 if (ndo->ndo_vflag < 1) 227 ND_PRINT(": "); 228 else 229 ND_PRINT("\n\t"); 230 231 if (ethertype_print(ndo, prot, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL) == 0) { 232 if (prot == ETHERTYPE_TEB) 233 ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL); 234 else 235 ND_PRINT("geneve-proto-0x%x", prot); 236 } 237 238 return; 239 240 trunc: 241 nd_print_trunc(ndo); 242 } 243