1 /* 2 * Copyright (C) 1998 and 1999 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* \summary: IPv6 DHCP printer */ 31 32 /* 33 * RFC3315: DHCPv6 34 * supported DHCPv6 options: 35 * RFC3319: Session Initiation Protocol (SIP) Servers options, 36 * RFC3633: IPv6 Prefix options, 37 * RFC3646: DNS Configuration options, 38 * RFC3898: Network Information Service (NIS) Configuration options, 39 * RFC4075: Simple Network Time Protocol (SNTP) Configuration option, 40 * RFC4242: Information Refresh Time option, 41 * RFC4280: Broadcast and Multicast Control Servers options, 42 * RFC5908: Network Time Protocol (NTP) Server Option for DHCPv6 43 * RFC6334: Dual-Stack Lite option, 44 */ 45 46 #ifdef HAVE_CONFIG_H 47 #include "config.h" 48 #endif 49 50 #include <netdissect-stdinc.h> 51 52 #include <stdio.h> 53 #include <string.h> 54 55 #include "netdissect.h" 56 #include "addrtoname.h" 57 #include "extract.h" 58 59 /* lease duration */ 60 #define DHCP6_DURATION_INFINITE 0xffffffff 61 62 /* Error Values */ 63 #define DH6ERR_FAILURE 16 64 #define DH6ERR_AUTHFAIL 17 65 #define DH6ERR_POORLYFORMED 18 66 #define DH6ERR_UNAVAIL 19 67 #define DH6ERR_OPTUNAVAIL 20 68 69 /* Message type */ 70 #define DH6_SOLICIT 1 71 #define DH6_ADVERTISE 2 72 #define DH6_REQUEST 3 73 #define DH6_CONFIRM 4 74 #define DH6_RENEW 5 75 #define DH6_REBIND 6 76 #define DH6_REPLY 7 77 #define DH6_RELEASE 8 78 #define DH6_DECLINE 9 79 #define DH6_RECONFIGURE 10 80 #define DH6_INFORM_REQ 11 81 #define DH6_RELAY_FORW 12 82 #define DH6_RELAY_REPLY 13 83 #define DH6_LEASEQUERY 14 84 #define DH6_LQ_REPLY 15 85 86 static const struct tok dh6_msgtype_str[] = { 87 { DH6_SOLICIT, "solicit" }, 88 { DH6_ADVERTISE, "advertise" }, 89 { DH6_REQUEST, "request" }, 90 { DH6_CONFIRM, "confirm" }, 91 { DH6_RENEW, "renew" }, 92 { DH6_REBIND, "rebind" }, 93 { DH6_REPLY, "reply" }, 94 { DH6_RELEASE, "release" }, 95 { DH6_DECLINE, "decline" }, 96 { DH6_RECONFIGURE, "reconfigure" }, 97 { DH6_INFORM_REQ, "inf-req" }, 98 { DH6_RELAY_FORW, "relay-fwd" }, 99 { DH6_RELAY_REPLY, "relay-reply" }, 100 { DH6_LEASEQUERY, "leasequery" }, 101 { DH6_LQ_REPLY, "leasequery-reply" }, 102 { 0, NULL } 103 }; 104 105 /* DHCP6 base packet format */ 106 struct dhcp6 { 107 union { 108 nd_uint8_t m; 109 nd_uint32_t x; 110 } dh6_msgtypexid; 111 /* options follow */ 112 }; 113 #define dh6_msgtype dh6_msgtypexid.m 114 #define dh6_xid dh6_msgtypexid.x 115 #define DH6_XIDMASK 0x00ffffff 116 117 /* DHCPv6 relay messages */ 118 struct dhcp6_relay { 119 nd_uint8_t dh6relay_msgtype; 120 nd_uint8_t dh6relay_hcnt; 121 nd_uint8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */ 122 nd_uint8_t dh6relay_peeraddr[16]; 123 /* options follow */ 124 }; 125 126 /* options */ 127 #define DH6OPT_CLIENTID 1 128 #define DH6OPT_SERVERID 2 129 #define DH6OPT_IA_NA 3 130 #define DH6OPT_IA_TA 4 131 #define DH6OPT_IA_ADDR 5 132 #define DH6OPT_ORO 6 133 #define DH6OPT_PREFERENCE 7 134 # define DH6OPT_PREF_MAX 255 135 #define DH6OPT_ELAPSED_TIME 8 136 #define DH6OPT_RELAY_MSG 9 137 /*#define DH6OPT_SERVER_MSG 10 deprecated */ 138 #define DH6OPT_AUTH 11 139 # define DH6OPT_AUTHPROTO_DELAYED 2 140 # define DH6OPT_AUTHPROTO_RECONFIG 3 141 # define DH6OPT_AUTHALG_HMACMD5 1 142 # define DH6OPT_AUTHRDM_MONOCOUNTER 0 143 # define DH6OPT_AUTHRECONFIG_KEY 1 144 # define DH6OPT_AUTHRECONFIG_HMACMD5 2 145 #define DH6OPT_UNICAST 12 146 #define DH6OPT_STATUS_CODE 13 147 # define DH6OPT_STCODE_SUCCESS 0 148 # define DH6OPT_STCODE_UNSPECFAIL 1 149 # define DH6OPT_STCODE_NOADDRAVAIL 2 150 # define DH6OPT_STCODE_NOBINDING 3 151 # define DH6OPT_STCODE_NOTONLINK 4 152 # define DH6OPT_STCODE_USEMULTICAST 5 153 # define DH6OPT_STCODE_NOPREFIXAVAIL 6 154 # define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7 155 # define DH6OPT_STCODE_MALFORMEDQUERY 8 156 # define DH6OPT_STCODE_NOTCONFIGURED 9 157 # define DH6OPT_STCODE_NOTALLOWED 10 158 #define DH6OPT_RAPID_COMMIT 14 159 #define DH6OPT_USER_CLASS 15 160 #define DH6OPT_VENDOR_CLASS 16 161 #define DH6OPT_VENDOR_OPTS 17 162 #define DH6OPT_INTERFACE_ID 18 163 #define DH6OPT_RECONF_MSG 19 164 #define DH6OPT_RECONF_ACCEPT 20 165 #define DH6OPT_SIP_SERVER_D 21 166 #define DH6OPT_SIP_SERVER_A 22 167 #define DH6OPT_DNS_SERVERS 23 168 #define DH6OPT_DOMAIN_LIST 24 169 #define DH6OPT_IA_PD 25 170 #define DH6OPT_IA_PD_PREFIX 26 171 #define DH6OPT_NIS_SERVERS 27 172 #define DH6OPT_NISP_SERVERS 28 173 #define DH6OPT_NIS_NAME 29 174 #define DH6OPT_NISP_NAME 30 175 #define DH6OPT_SNTP_SERVERS 31 176 #define DH6OPT_LIFETIME 32 177 #define DH6OPT_BCMCS_SERVER_D 33 178 #define DH6OPT_BCMCS_SERVER_A 34 179 #define DH6OPT_GEOCONF_CIVIC 36 180 #define DH6OPT_REMOTE_ID 37 181 #define DH6OPT_SUBSCRIBER_ID 38 182 #define DH6OPT_CLIENT_FQDN 39 183 #define DH6OPT_PANA_AGENT 40 184 #define DH6OPT_NEW_POSIX_TIMEZONE 41 185 #define DH6OPT_NEW_TZDB_TIMEZONE 42 186 #define DH6OPT_ERO 43 187 #define DH6OPT_LQ_QUERY 44 188 #define DH6OPT_CLIENT_DATA 45 189 #define DH6OPT_CLT_TIME 46 190 #define DH6OPT_LQ_RELAY_DATA 47 191 #define DH6OPT_LQ_CLIENT_LINK 48 192 #define DH6OPT_NTP_SERVER 56 193 # define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1 194 # define DH6OPT_NTP_SUBOPTION_MC_ADDR 2 195 # define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3 196 #define DH6OPT_AFTR_NAME 64 197 #define DH6OPT_MUDURL 112 198 199 static const struct tok dh6opt_str[] = { 200 { DH6OPT_CLIENTID, "client-ID" }, 201 { DH6OPT_SERVERID, "server-ID" }, 202 { DH6OPT_IA_NA, "IA_NA" }, 203 { DH6OPT_IA_TA, "IA_TA" }, 204 { DH6OPT_IA_ADDR, "IA_ADDR" }, 205 { DH6OPT_ORO, "option-request" }, 206 { DH6OPT_PREFERENCE, "preference" }, 207 { DH6OPT_ELAPSED_TIME, "elapsed-time" }, 208 { DH6OPT_RELAY_MSG, "relay-message" }, 209 { DH6OPT_AUTH, "authentication" }, 210 { DH6OPT_UNICAST, "server-unicast" }, 211 { DH6OPT_STATUS_CODE, "status-code" }, 212 { DH6OPT_RAPID_COMMIT, "rapid-commit" }, 213 { DH6OPT_USER_CLASS, "user-class" }, 214 { DH6OPT_VENDOR_CLASS, "vendor-class" }, 215 { DH6OPT_VENDOR_OPTS, "vendor-specific-info" }, 216 { DH6OPT_INTERFACE_ID, "interface-ID" }, 217 { DH6OPT_RECONF_MSG, "reconfigure-message" }, 218 { DH6OPT_RECONF_ACCEPT, "reconfigure-accept" }, 219 { DH6OPT_SIP_SERVER_D, "SIP-servers-domain" }, 220 { DH6OPT_SIP_SERVER_A, "SIP-servers-address" }, 221 { DH6OPT_DNS_SERVERS, "DNS-server" }, 222 { DH6OPT_DOMAIN_LIST, "DNS-search-list" }, 223 { DH6OPT_IA_PD, "IA_PD" }, 224 { DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" }, 225 { DH6OPT_SNTP_SERVERS, "SNTP-servers" }, 226 { DH6OPT_LIFETIME, "lifetime" }, 227 { DH6OPT_NIS_SERVERS, "NIS-server" }, 228 { DH6OPT_NISP_SERVERS, "NIS+-server" }, 229 { DH6OPT_NIS_NAME, "NIS-domain-name" }, 230 { DH6OPT_NISP_NAME, "NIS+-domain-name" }, 231 { DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" }, 232 { DH6OPT_BCMCS_SERVER_A, "BCMCS-server" }, 233 { DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" }, 234 { DH6OPT_REMOTE_ID, "Remote-ID" }, 235 { DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" }, 236 { DH6OPT_CLIENT_FQDN, "Client-FQDN" }, 237 { DH6OPT_PANA_AGENT, "PANA-agent" }, 238 { DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" }, 239 { DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" }, 240 { DH6OPT_ERO, "Echo-request-option" }, 241 { DH6OPT_LQ_QUERY, "Lease-query" }, 242 { DH6OPT_CLIENT_DATA, "LQ-client-data" }, 243 { DH6OPT_CLT_TIME, "Clt-time" }, 244 { DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" }, 245 { DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" }, 246 { DH6OPT_NTP_SERVER, "NTP-server" }, 247 { DH6OPT_AFTR_NAME, "AFTR-Name" }, 248 { DH6OPT_MUDURL, "MUD-URL" }, 249 { 0, NULL } 250 }; 251 252 static const struct tok dh6opt_stcode_str[] = { 253 { DH6OPT_STCODE_SUCCESS, "Success" }, /* RFC3315 */ 254 { DH6OPT_STCODE_UNSPECFAIL, "UnspecFail" }, /* RFC3315 */ 255 { DH6OPT_STCODE_NOADDRAVAIL, "NoAddrsAvail" }, /* RFC3315 */ 256 { DH6OPT_STCODE_NOBINDING, "NoBinding" }, /* RFC3315 */ 257 { DH6OPT_STCODE_NOTONLINK, "NotOnLink" }, /* RFC3315 */ 258 { DH6OPT_STCODE_USEMULTICAST, "UseMulticast" }, /* RFC3315 */ 259 { DH6OPT_STCODE_NOPREFIXAVAIL, "NoPrefixAvail" }, /* RFC3633 */ 260 { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */ 261 { DH6OPT_STCODE_MALFORMEDQUERY, "MalformedQuery" }, /* RFC5007 */ 262 { DH6OPT_STCODE_NOTCONFIGURED, "NotConfigured" }, /* RFC5007 */ 263 { DH6OPT_STCODE_NOTALLOWED, "NotAllowed" }, /* RFC5007 */ 264 { 0, NULL } 265 }; 266 267 struct dhcp6opt { 268 nd_uint16_t dh6opt_type; 269 nd_uint16_t dh6opt_len; 270 /* type-dependent data follows */ 271 }; 272 273 static const char * 274 dhcp6stcode(const uint16_t code) 275 { 276 return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code); 277 } 278 279 static void 280 dhcp6opt_print(netdissect_options *ndo, 281 const u_char *cp, const u_char *ep) 282 { 283 const struct dhcp6opt *dh6o; 284 const u_char *tp; 285 size_t i; 286 uint16_t opttype; 287 size_t optlen; 288 uint8_t auth_proto; 289 u_int authinfolen, authrealmlen; 290 int remain_len; /* Length of remaining options */ 291 int label_len; /* Label length */ 292 uint16_t subopt_code; 293 uint16_t subopt_len; 294 295 if (cp == ep) 296 return; 297 while (cp < ep) { 298 if (ep < cp + sizeof(*dh6o)) 299 goto trunc; 300 dh6o = (const struct dhcp6opt *)cp; 301 ND_TCHECK(*dh6o); 302 optlen = EXTRACT_16BITS(&dh6o->dh6opt_len); 303 if (ep < cp + sizeof(*dh6o) + optlen) 304 goto trunc; 305 opttype = EXTRACT_16BITS(&dh6o->dh6opt_type); 306 ND_PRINT((ndo, " (%s", tok2str(dh6opt_str, "opt_%u", opttype))); 307 ND_TCHECK2(*(cp + sizeof(*dh6o)), optlen); 308 switch (opttype) { 309 case DH6OPT_CLIENTID: 310 case DH6OPT_SERVERID: 311 if (optlen < 2) { 312 /*(*/ 313 ND_PRINT((ndo, " ?)")); 314 break; 315 } 316 tp = (const u_char *)(dh6o + 1); 317 switch (EXTRACT_16BITS(tp)) { 318 case 1: 319 if (optlen >= 2 + 6) { 320 ND_PRINT((ndo, " hwaddr/time type %u time %u ", 321 EXTRACT_16BITS(&tp[2]), 322 EXTRACT_32BITS(&tp[4]))); 323 for (i = 8; i < optlen; i++) 324 ND_PRINT((ndo, "%02x", tp[i])); 325 /*(*/ 326 ND_PRINT((ndo, ")")); 327 } else { 328 /*(*/ 329 ND_PRINT((ndo, " ?)")); 330 } 331 break; 332 case 2: 333 if (optlen >= 2 + 8) { 334 ND_PRINT((ndo, " vid ")); 335 for (i = 2; i < 2 + 8; i++) 336 ND_PRINT((ndo, "%02x", tp[i])); 337 /*(*/ 338 ND_PRINT((ndo, ")")); 339 } else { 340 /*(*/ 341 ND_PRINT((ndo, " ?)")); 342 } 343 break; 344 case 3: 345 if (optlen >= 2 + 2) { 346 ND_PRINT((ndo, " hwaddr type %u ", 347 EXTRACT_16BITS(&tp[2]))); 348 for (i = 4; i < optlen; i++) 349 ND_PRINT((ndo, "%02x", tp[i])); 350 /*(*/ 351 ND_PRINT((ndo, ")")); 352 } else { 353 /*(*/ 354 ND_PRINT((ndo, " ?)")); 355 } 356 break; 357 default: 358 ND_PRINT((ndo, " type %d)", EXTRACT_16BITS(tp))); 359 break; 360 } 361 break; 362 case DH6OPT_IA_ADDR: 363 if (optlen < 24) { 364 /*(*/ 365 ND_PRINT((ndo, " ?)")); 366 break; 367 } 368 tp = (const u_char *)(dh6o + 1); 369 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0]))); 370 ND_PRINT((ndo, " pltime:%u vltime:%u", 371 EXTRACT_32BITS(&tp[16]), 372 EXTRACT_32BITS(&tp[20]))); 373 if (optlen > 24) { 374 /* there are sub-options */ 375 dhcp6opt_print(ndo, tp + 24, tp + optlen); 376 } 377 ND_PRINT((ndo, ")")); 378 break; 379 case DH6OPT_ORO: 380 case DH6OPT_ERO: 381 if (optlen % 2) { 382 ND_PRINT((ndo, " ?)")); 383 break; 384 } 385 tp = (const u_char *)(dh6o + 1); 386 for (i = 0; i < optlen; i += 2) { 387 ND_PRINT((ndo, " %s", 388 tok2str(dh6opt_str, "opt_%u", EXTRACT_16BITS(&tp[i])))); 389 } 390 ND_PRINT((ndo, ")")); 391 break; 392 case DH6OPT_PREFERENCE: 393 if (optlen != 1) { 394 ND_PRINT((ndo, " ?)")); 395 break; 396 } 397 tp = (const u_char *)(dh6o + 1); 398 ND_PRINT((ndo, " %d)", *tp)); 399 break; 400 case DH6OPT_ELAPSED_TIME: 401 if (optlen != 2) { 402 ND_PRINT((ndo, " ?)")); 403 break; 404 } 405 tp = (const u_char *)(dh6o + 1); 406 ND_PRINT((ndo, " %d)", EXTRACT_16BITS(tp))); 407 break; 408 case DH6OPT_RELAY_MSG: 409 ND_PRINT((ndo, " (")); 410 tp = (const u_char *)(dh6o + 1); 411 dhcp6_print(ndo, tp, optlen); 412 ND_PRINT((ndo, ")")); 413 break; 414 case DH6OPT_AUTH: 415 if (optlen < 11) { 416 ND_PRINT((ndo, " ?)")); 417 break; 418 } 419 tp = (const u_char *)(dh6o + 1); 420 auth_proto = *tp; 421 switch (auth_proto) { 422 case DH6OPT_AUTHPROTO_DELAYED: 423 ND_PRINT((ndo, " proto: delayed")); 424 break; 425 case DH6OPT_AUTHPROTO_RECONFIG: 426 ND_PRINT((ndo, " proto: reconfigure")); 427 break; 428 default: 429 ND_PRINT((ndo, " proto: %d", auth_proto)); 430 break; 431 } 432 tp++; 433 switch (*tp) { 434 case DH6OPT_AUTHALG_HMACMD5: 435 /* XXX: may depend on the protocol */ 436 ND_PRINT((ndo, ", alg: HMAC-MD5")); 437 break; 438 default: 439 ND_PRINT((ndo, ", alg: %d", *tp)); 440 break; 441 } 442 tp++; 443 switch (*tp) { 444 case DH6OPT_AUTHRDM_MONOCOUNTER: 445 ND_PRINT((ndo, ", RDM: mono")); 446 break; 447 default: 448 ND_PRINT((ndo, ", RDM: %d", *tp)); 449 break; 450 } 451 tp++; 452 ND_PRINT((ndo, ", RD:")); 453 for (i = 0; i < 4; i++, tp += 2) 454 ND_PRINT((ndo, " %04x", EXTRACT_16BITS(tp))); 455 456 /* protocol dependent part */ 457 authinfolen = optlen - 11; 458 switch (auth_proto) { 459 case DH6OPT_AUTHPROTO_DELAYED: 460 if (authinfolen == 0) 461 break; 462 if (authinfolen < 20) { 463 ND_PRINT((ndo, " ??")); 464 break; 465 } 466 authrealmlen = authinfolen - 20; 467 if (authrealmlen > 0) { 468 ND_PRINT((ndo, ", realm: ")); 469 } 470 for (i = 0; i < authrealmlen; i++, tp++) 471 ND_PRINT((ndo, "%02x", *tp)); 472 ND_PRINT((ndo, ", key ID: %08x", EXTRACT_32BITS(tp))); 473 tp += 4; 474 ND_PRINT((ndo, ", HMAC-MD5:")); 475 for (i = 0; i < 4; i++, tp+= 4) 476 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp))); 477 break; 478 case DH6OPT_AUTHPROTO_RECONFIG: 479 if (authinfolen != 17) { 480 ND_PRINT((ndo, " ??")); 481 break; 482 } 483 switch (*tp++) { 484 case DH6OPT_AUTHRECONFIG_KEY: 485 ND_PRINT((ndo, " reconfig-key")); 486 break; 487 case DH6OPT_AUTHRECONFIG_HMACMD5: 488 ND_PRINT((ndo, " type: HMAC-MD5")); 489 break; 490 default: 491 ND_PRINT((ndo, " type: ??")); 492 break; 493 } 494 ND_PRINT((ndo, " value:")); 495 for (i = 0; i < 4; i++, tp+= 4) 496 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp))); 497 break; 498 default: 499 ND_PRINT((ndo, " ??")); 500 break; 501 } 502 503 ND_PRINT((ndo, ")")); 504 break; 505 case DH6OPT_RAPID_COMMIT: /* nothing todo */ 506 ND_PRINT((ndo, ")")); 507 break; 508 case DH6OPT_INTERFACE_ID: 509 case DH6OPT_SUBSCRIBER_ID: 510 /* 511 * Since we cannot predict the encoding, print hex dump 512 * at most 10 characters. 513 */ 514 tp = (const u_char *)(dh6o + 1); 515 ND_PRINT((ndo, " ")); 516 for (i = 0; i < optlen && i < 10; i++) 517 ND_PRINT((ndo, "%02x", tp[i])); 518 ND_PRINT((ndo, "...)")); 519 break; 520 case DH6OPT_RECONF_MSG: 521 if (optlen != 1) { 522 ND_PRINT((ndo, " ?)")); 523 break; 524 } 525 tp = (const u_char *)(dh6o + 1); 526 switch (*tp) { 527 case DH6_RENEW: 528 ND_PRINT((ndo, " for renew)")); 529 break; 530 case DH6_INFORM_REQ: 531 ND_PRINT((ndo, " for inf-req)")); 532 break; 533 default: 534 ND_PRINT((ndo, " for ?\?\?(%02x))", *tp)); 535 break; 536 } 537 break; 538 case DH6OPT_RECONF_ACCEPT: /* nothing todo */ 539 ND_PRINT((ndo, ")")); 540 break; 541 case DH6OPT_SIP_SERVER_A: 542 case DH6OPT_DNS_SERVERS: 543 case DH6OPT_SNTP_SERVERS: 544 case DH6OPT_NIS_SERVERS: 545 case DH6OPT_NISP_SERVERS: 546 case DH6OPT_BCMCS_SERVER_A: 547 case DH6OPT_PANA_AGENT: 548 case DH6OPT_LQ_CLIENT_LINK: 549 if (optlen % 16) { 550 ND_PRINT((ndo, " ?)")); 551 break; 552 } 553 tp = (const u_char *)(dh6o + 1); 554 for (i = 0; i < optlen; i += 16) 555 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[i]))); 556 ND_PRINT((ndo, ")")); 557 break; 558 case DH6OPT_SIP_SERVER_D: 559 case DH6OPT_DOMAIN_LIST: 560 tp = (const u_char *)(dh6o + 1); 561 while (tp < cp + sizeof(*dh6o) + optlen) { 562 ND_PRINT((ndo, " ")); 563 if ((tp = ns_nprint(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL) 564 goto trunc; 565 } 566 ND_PRINT((ndo, ")")); 567 break; 568 case DH6OPT_STATUS_CODE: 569 if (optlen < 2) { 570 ND_PRINT((ndo, " ?)")); 571 break; 572 } 573 tp = (const u_char *)(dh6o + 1); 574 ND_PRINT((ndo, " %s)", dhcp6stcode(EXTRACT_16BITS(&tp[0])))); 575 break; 576 case DH6OPT_IA_NA: 577 case DH6OPT_IA_PD: 578 if (optlen < 12) { 579 ND_PRINT((ndo, " ?)")); 580 break; 581 } 582 tp = (const u_char *)(dh6o + 1); 583 ND_PRINT((ndo, " IAID:%u T1:%u T2:%u", 584 EXTRACT_32BITS(&tp[0]), 585 EXTRACT_32BITS(&tp[4]), 586 EXTRACT_32BITS(&tp[8]))); 587 if (optlen > 12) { 588 /* there are sub-options */ 589 dhcp6opt_print(ndo, tp + 12, tp + optlen); 590 } 591 ND_PRINT((ndo, ")")); 592 break; 593 case DH6OPT_IA_TA: 594 if (optlen < 4) { 595 ND_PRINT((ndo, " ?)")); 596 break; 597 } 598 tp = (const u_char *)(dh6o + 1); 599 ND_PRINT((ndo, " IAID:%u", EXTRACT_32BITS(tp))); 600 if (optlen > 4) { 601 /* there are sub-options */ 602 dhcp6opt_print(ndo, tp + 4, tp + optlen); 603 } 604 ND_PRINT((ndo, ")")); 605 break; 606 case DH6OPT_IA_PD_PREFIX: 607 if (optlen < 25) { 608 ND_PRINT((ndo, " ?)")); 609 break; 610 } 611 tp = (const u_char *)(dh6o + 1); 612 ND_PRINT((ndo, " %s/%d", ip6addr_string(ndo, &tp[9]), tp[8])); 613 ND_PRINT((ndo, " pltime:%u vltime:%u", 614 EXTRACT_32BITS(&tp[0]), 615 EXTRACT_32BITS(&tp[4]))); 616 if (optlen > 25) { 617 /* there are sub-options */ 618 dhcp6opt_print(ndo, tp + 25, tp + optlen); 619 } 620 ND_PRINT((ndo, ")")); 621 break; 622 case DH6OPT_LIFETIME: 623 case DH6OPT_CLT_TIME: 624 if (optlen != 4) { 625 ND_PRINT((ndo, " ?)")); 626 break; 627 } 628 tp = (const u_char *)(dh6o + 1); 629 ND_PRINT((ndo, " %d)", EXTRACT_32BITS(tp))); 630 break; 631 case DH6OPT_REMOTE_ID: 632 if (optlen < 4) { 633 ND_PRINT((ndo, " ?)")); 634 break; 635 } 636 tp = (const u_char *)(dh6o + 1); 637 ND_PRINT((ndo, " %d ", EXTRACT_32BITS(tp))); 638 /* 639 * Print hex dump first 10 characters. 640 */ 641 for (i = 4; i < optlen && i < 14; i++) 642 ND_PRINT((ndo, "%02x", tp[i])); 643 ND_PRINT((ndo, "...)")); 644 break; 645 case DH6OPT_LQ_QUERY: 646 if (optlen < 17) { 647 ND_PRINT((ndo, " ?)")); 648 break; 649 } 650 tp = (const u_char *)(dh6o + 1); 651 switch (*tp) { 652 case 1: 653 ND_PRINT((ndo, " by-address")); 654 break; 655 case 2: 656 ND_PRINT((ndo, " by-clientID")); 657 break; 658 default: 659 ND_PRINT((ndo, " type_%d", (int)*tp)); 660 break; 661 } 662 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[1]))); 663 if (optlen > 17) { 664 /* there are query-options */ 665 dhcp6opt_print(ndo, tp + 17, tp + optlen); 666 } 667 ND_PRINT((ndo, ")")); 668 break; 669 case DH6OPT_CLIENT_DATA: 670 tp = (const u_char *)(dh6o + 1); 671 if (optlen > 0) { 672 /* there are encapsulated options */ 673 dhcp6opt_print(ndo, tp, tp + optlen); 674 } 675 ND_PRINT((ndo, ")")); 676 break; 677 case DH6OPT_LQ_RELAY_DATA: 678 if (optlen < 16) { 679 ND_PRINT((ndo, " ?)")); 680 break; 681 } 682 tp = (const u_char *)(dh6o + 1); 683 ND_PRINT((ndo, " %s ", ip6addr_string(ndo, &tp[0]))); 684 /* 685 * Print hex dump first 10 characters. 686 */ 687 for (i = 16; i < optlen && i < 26; i++) 688 ND_PRINT((ndo, "%02x", tp[i])); 689 ND_PRINT((ndo, "...)")); 690 break; 691 case DH6OPT_NTP_SERVER: 692 if (optlen < 4) { 693 ND_PRINT((ndo, " ?)")); 694 break; 695 } 696 tp = (const u_char *)(dh6o + 1); 697 while (tp < cp + sizeof(*dh6o) + optlen - 4) { 698 subopt_code = EXTRACT_16BITS(tp); 699 tp += 2; 700 subopt_len = EXTRACT_16BITS(tp); 701 tp += 2; 702 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen) 703 goto trunc; 704 ND_PRINT((ndo, " subopt:%d", subopt_code)); 705 switch (subopt_code) { 706 case DH6OPT_NTP_SUBOPTION_SRV_ADDR: 707 case DH6OPT_NTP_SUBOPTION_MC_ADDR: 708 if (subopt_len != 16) { 709 ND_PRINT((ndo, " ?")); 710 break; 711 } 712 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0]))); 713 break; 714 case DH6OPT_NTP_SUBOPTION_SRV_FQDN: 715 ND_PRINT((ndo, " ")); 716 if (ns_nprint(ndo, tp, tp + subopt_len) == NULL) 717 goto trunc; 718 break; 719 default: 720 ND_PRINT((ndo, " ?")); 721 break; 722 } 723 tp += subopt_len; 724 } 725 ND_PRINT((ndo, ")")); 726 break; 727 case DH6OPT_AFTR_NAME: 728 if (optlen < 3) { 729 ND_PRINT((ndo, " ?)")); 730 break; 731 } 732 tp = (const u_char *)(dh6o + 1); 733 remain_len = optlen; 734 ND_PRINT((ndo, " ")); 735 /* Encoding is described in section 3.1 of RFC 1035 */ 736 while (remain_len && *tp) { 737 label_len = *tp++; 738 if (label_len < remain_len - 1) { 739 (void)fn_printn(ndo, tp, label_len, NULL); 740 tp += label_len; 741 remain_len -= (label_len + 1); 742 if(*tp) ND_PRINT((ndo, ".")); 743 } else { 744 ND_PRINT((ndo, " ?")); 745 break; 746 } 747 } 748 ND_PRINT((ndo, ")")); 749 break; 750 case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */ 751 case DH6OPT_NEW_TZDB_TIMEZONE: /* are encoded similarly */ 752 case DH6OPT_MUDURL: /* although GMT might not work */ 753 if (optlen < 5) { 754 ND_PRINT((ndo, " ?)")); 755 break; 756 } 757 tp = (const u_char *)(dh6o + 1); 758 ND_PRINT((ndo, "=")); 759 (void)fn_printn(ndo, tp, (u_int)optlen, NULL); 760 ND_PRINT((ndo, ")")); 761 break; 762 763 default: 764 ND_PRINT((ndo, ")")); 765 break; 766 } 767 768 cp += sizeof(*dh6o) + optlen; 769 } 770 return; 771 772 trunc: 773 ND_PRINT((ndo, "[|dhcp6ext]")); 774 } 775 776 /* 777 * Print dhcp6 packets 778 */ 779 void 780 dhcp6_print(netdissect_options *ndo, 781 const u_char *cp, u_int length) 782 { 783 const struct dhcp6 *dh6; 784 const struct dhcp6_relay *dh6relay; 785 const u_char *ep; 786 const u_char *extp; 787 const char *name; 788 789 ND_PRINT((ndo, "dhcp6")); 790 791 ep = (const u_char *)ndo->ndo_snapend; 792 if (cp + length < ep) 793 ep = cp + length; 794 795 dh6 = (const struct dhcp6 *)cp; 796 dh6relay = (const struct dhcp6_relay *)cp; 797 ND_TCHECK(dh6->dh6_xid); 798 name = tok2str(dh6_msgtype_str, "msgtype-%u", dh6->dh6_msgtype); 799 800 if (!ndo->ndo_vflag) { 801 ND_PRINT((ndo, " %s", name)); 802 return; 803 } 804 805 /* XXX relay agent messages have to be handled differently */ 806 807 ND_PRINT((ndo, " %s (", name)); /*)*/ 808 if (dh6->dh6_msgtype != DH6_RELAY_FORW && 809 dh6->dh6_msgtype != DH6_RELAY_REPLY) { 810 ND_PRINT((ndo, "xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK)); 811 extp = (const u_char *)(dh6 + 1); 812 dhcp6opt_print(ndo, extp, ep); 813 } else { /* relay messages */ 814 struct in6_addr addr6; 815 816 ND_TCHECK(dh6relay->dh6relay_peeraddr); 817 818 memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6)); 819 ND_PRINT((ndo, "linkaddr=%s", ip6addr_string(ndo, &addr6))); 820 821 memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6)); 822 ND_PRINT((ndo, " peeraddr=%s", ip6addr_string(ndo, &addr6))); 823 824 dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep); 825 } 826 /*(*/ 827 ND_PRINT((ndo, ")")); 828 return; 829 830 trunc: 831 ND_PRINT((ndo, "[|dhcp6]")); 832 } 833
