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 #ifdef HAVE_CONFIG_H 21 #include "config.h" 22 #endif 23 24 #include <netdissect-stdinc.h> 25 26 #include "netdissect.h" 27 #include "extract.h" 28 #include "ethertype.h" 29 30 /* 31 * Geneve header, draft-ietf-nvo3-geneve 32 * 33 * 0 1 2 3 34 * 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 35 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 36 * |Ver| Opt Len |O|C| Rsvd. | Protocol Type | 37 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 38 * | Virtual Network Identifier (VNI) | Reserved | 39 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 40 * | Variable Length Options | 41 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 42 * 43 * Options: 44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 45 * | Option Class | Type |R|R|R| Length | 46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 47 * | Variable Option Data | 48 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 49 */ 50 51 #define VER_SHIFT 6 52 #define HDR_OPTS_LEN_MASK 0x3F 53 54 #define FLAG_OAM (1 << 7) 55 #define FLAG_CRITICAL (1 << 6) 56 #define FLAG_R1 (1 << 5) 57 #define FLAG_R2 (1 << 4) 58 #define FLAG_R3 (1 << 3) 59 #define FLAG_R4 (1 << 2) 60 #define FLAG_R5 (1 << 1) 61 #define FLAG_R6 (1 << 0) 62 63 #define OPT_TYPE_CRITICAL (1 << 7) 64 #define OPT_LEN_MASK 0x1F 65 66 static const struct tok geneve_flag_values[] = { 67 { FLAG_OAM, "O" }, 68 { FLAG_CRITICAL, "C" }, 69 { FLAG_R1, "R1" }, 70 { FLAG_R2, "R2" }, 71 { FLAG_R3, "R3" }, 72 { FLAG_R4, "R4" }, 73 { FLAG_R5, "R5" }, 74 { FLAG_R6, "R6" }, 75 { 0, NULL } 76 }; 77 78 static const char * 79 format_opt_class(uint16_t opt_class) 80 { 81 switch (opt_class) { 82 case 0x0100: 83 return "Linux"; 84 case 0x0101: 85 return "Open vSwitch"; 86 case 0x0102: 87 return "Open Virtual Networking (OVN)"; 88 case 0x0103: 89 return "In-band Network Telemetry (INT)"; 90 case 0x0104: 91 return "VMware"; 92 default: 93 if (opt_class <= 0x00ff) 94 return "Standard"; 95 else if (opt_class >= 0xfff0) 96 return "Experimental"; 97 } 98 99 return "Unknown"; 100 } 101 102 static void 103 geneve_opts_print(netdissect_options *ndo, const u_char *bp, u_int len) 104 { 105 const char *sep = ""; 106 107 while (len > 0) { 108 uint16_t opt_class; 109 uint8_t opt_type; 110 uint8_t opt_len; 111 112 ND_PRINT((ndo, "%s", sep)); 113 sep = ", "; 114 115 opt_class = EXTRACT_16BITS(bp); 116 opt_type = *(bp + 2); 117 opt_len = 4 + ((*(bp + 3) & OPT_LEN_MASK) * 4); 118 119 ND_PRINT((ndo, "class %s (0x%x) type 0x%x%s len %u", 120 format_opt_class(opt_class), opt_class, opt_type, 121 opt_type & OPT_TYPE_CRITICAL ? "(C)" : "", opt_len)); 122 123 if (opt_len > len) { 124 ND_PRINT((ndo, " [bad length]")); 125 return; 126 } 127 128 if (ndo->ndo_vflag > 1 && opt_len > 4) { 129 const uint32_t *data = (const uint32_t *)(bp + 4); 130 int i; 131 132 ND_PRINT((ndo, " data")); 133 134 for (i = 4; i < opt_len; i += 4) { 135 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(data))); 136 data++; 137 } 138 } 139 140 bp += opt_len; 141 len -= opt_len; 142 } 143 } 144 145 void 146 geneve_print(netdissect_options *ndo, const u_char *bp, u_int len) 147 { 148 uint8_t ver_opt; 149 u_int version; 150 uint8_t flags; 151 uint16_t prot; 152 uint32_t vni; 153 uint8_t reserved; 154 u_int opts_len; 155 156 ND_PRINT((ndo, "Geneve")); 157 158 ND_TCHECK2(*bp, 8); 159 160 ver_opt = *bp; 161 bp += 1; 162 len -= 1; 163 164 version = ver_opt >> VER_SHIFT; 165 if (version != 0) { 166 ND_PRINT((ndo, " ERROR: unknown-version %u", version)); 167 return; 168 } 169 170 flags = *bp; 171 bp += 1; 172 len -= 1; 173 174 prot = EXTRACT_16BITS(bp); 175 bp += 2; 176 len -= 2; 177 178 vni = EXTRACT_24BITS(bp); 179 bp += 3; 180 len -= 3; 181 182 reserved = *bp; 183 bp += 1; 184 len -= 1; 185 186 ND_PRINT((ndo, ", Flags [%s]", 187 bittok2str_nosep(geneve_flag_values, "none", flags))); 188 ND_PRINT((ndo, ", vni 0x%x", vni)); 189 190 if (reserved) 191 ND_PRINT((ndo, ", rsvd 0x%x", reserved)); 192 193 if (ndo->ndo_eflag) 194 ND_PRINT((ndo, ", proto %s (0x%04x)", 195 tok2str(ethertype_values, "unknown", prot), prot)); 196 197 opts_len = (ver_opt & HDR_OPTS_LEN_MASK) * 4; 198 199 if (len < opts_len) { 200 ND_PRINT((ndo, " truncated-geneve - %u bytes missing", 201 opts_len - len)); 202 return; 203 } 204 205 ND_TCHECK2(*bp, opts_len); 206 207 if (opts_len > 0) { 208 ND_PRINT((ndo, ", options [")); 209 210 if (ndo->ndo_vflag) 211 geneve_opts_print(ndo, bp, opts_len); 212 else 213 ND_PRINT((ndo, "%u bytes", opts_len)); 214 215 ND_PRINT((ndo, "]")); 216 } 217 218 bp += opts_len; 219 len -= opts_len; 220 221 if (ndo->ndo_vflag < 1) 222 ND_PRINT((ndo, ": ")); 223 else 224 ND_PRINT((ndo, "\n\t")); 225 226 if (ethertype_print(ndo, prot, bp, len, ndo->ndo_snapend - bp, NULL, NULL) == 0) { 227 if (prot == ETHERTYPE_TEB) 228 ether_print(ndo, bp, len, ndo->ndo_snapend - bp, NULL, NULL); 229 else 230 ND_PRINT((ndo, "geneve-proto-0x%x", prot)); 231 } 232 233 return; 234 235 trunc: 236 ND_PRINT((ndo, " [|geneve]")); 237 } 238