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 * RFC3315: DHCPv6 31 * supported DHCPv6 options: 32 * RFC3319: Session Initiation Protocol (SIP) Servers options, 33 * RFC3633: IPv6 Prefix options, 34 * RFC3646: DNS Configuration options, 35 * RFC3898: Network Information Service (NIS) Configuration options, 36 * RFC4075: Simple Network Time Protocol (SNTP) Configuration option, 37 * RFC4242: Information Refresh Time option, 38 * RFC4280: Broadcast and Multicast Control Servers options, 39 * RFC5908: Network Time Protocol (NTP) Server Option for DHCPv6 40 * RFC6334: Dual-Stack Lite option, 41 */ 42 43 #include <sys/cdefs.h> 44 #ifndef lint 45 __RCSID("$NetBSD: print-dhcp6.c,v 1.5 2014/11/20 03:05:03 christos Exp $"); 46 #endif 47 48 #define NETDISSECT_REWORKED 49 #ifdef HAVE_CONFIG_H 50 #include "config.h" 51 #endif 52 53 #include <tcpdump-stdinc.h> 54 55 #include <stdio.h> 56 #include <string.h> 57 58 #include "interface.h" 59 #include "addrtoname.h" 60 #include "extract.h" 61 62 /* lease duration */ 63 #define DHCP6_DURATION_INFINITE 0xffffffff 64 65 /* Error Values */ 66 #define DH6ERR_FAILURE 16 67 #define DH6ERR_AUTHFAIL 17 68 #define DH6ERR_POORLYFORMED 18 69 #define DH6ERR_UNAVAIL 19 70 #define DH6ERR_OPTUNAVAIL 20 71 72 /* Message type */ 73 #define DH6_SOLICIT 1 74 #define DH6_ADVERTISE 2 75 #define DH6_REQUEST 3 76 #define DH6_CONFIRM 4 77 #define DH6_RENEW 5 78 #define DH6_REBIND 6 79 #define DH6_REPLY 7 80 #define DH6_RELEASE 8 81 #define DH6_DECLINE 9 82 #define DH6_RECONFIGURE 10 83 #define DH6_INFORM_REQ 11 84 #define DH6_RELAY_FORW 12 85 #define DH6_RELAY_REPLY 13 86 #define DH6_LEASEQUERY 14 87 #define DH6_LQ_REPLY 15 88 89 static const struct tok dh6_msgtype_str[] = { 90 { DH6_SOLICIT, "solicit" }, 91 { DH6_ADVERTISE, "advertise" }, 92 { DH6_REQUEST, "request" }, 93 { DH6_CONFIRM, "confirm" }, 94 { DH6_RENEW, "renew" }, 95 { DH6_REBIND, "rebind" }, 96 { DH6_REPLY, "reply" }, 97 { DH6_RELEASE, "release" }, 98 { DH6_DECLINE, "decline" }, 99 { DH6_RECONFIGURE, "reconfigure" }, 100 { DH6_INFORM_REQ, "inf-req" }, 101 { DH6_RELAY_FORW, "relay-fwd" }, 102 { DH6_RELAY_REPLY, "relay-reply" }, 103 { DH6_LEASEQUERY, "leasequery" }, 104 { DH6_LQ_REPLY, "leasequery-reply" }, 105 { 0, NULL } 106 }; 107 108 /* DHCP6 base packet format */ 109 struct dhcp6 { 110 union { 111 uint8_t m; 112 uint32_t x; 113 } dh6_msgtypexid; 114 /* options follow */ 115 }; 116 #define dh6_msgtype dh6_msgtypexid.m 117 #define dh6_xid dh6_msgtypexid.x 118 #define DH6_XIDMASK 0x00ffffff 119 120 /* DHCPv6 relay messages */ 121 struct dhcp6_relay { 122 uint8_t dh6relay_msgtype; 123 uint8_t dh6relay_hcnt; 124 uint8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */ 125 uint8_t dh6relay_peeraddr[16]; 126 /* options follow */ 127 }; 128 129 /* options */ 130 #define DH6OPT_CLIENTID 1 131 #define DH6OPT_SERVERID 2 132 #define DH6OPT_IA_NA 3 133 #define DH6OPT_IA_TA 4 134 #define DH6OPT_IA_ADDR 5 135 #define DH6OPT_ORO 6 136 #define DH6OPT_PREFERENCE 7 137 # define DH6OPT_PREF_MAX 255 138 #define DH6OPT_ELAPSED_TIME 8 139 #define DH6OPT_RELAY_MSG 9 140 /*#define DH6OPT_SERVER_MSG 10 deprecated */ 141 #define DH6OPT_AUTH 11 142 # define DH6OPT_AUTHPROTO_DELAYED 2 143 # define DH6OPT_AUTHPROTO_RECONFIG 3 144 # define DH6OPT_AUTHALG_HMACMD5 1 145 # define DH6OPT_AUTHRDM_MONOCOUNTER 0 146 # define DH6OPT_AUTHRECONFIG_KEY 1 147 # define DH6OPT_AUTHRECONFIG_HMACMD5 2 148 #define DH6OPT_UNICAST 12 149 #define DH6OPT_STATUS_CODE 13 150 # define DH6OPT_STCODE_SUCCESS 0 151 # define DH6OPT_STCODE_UNSPECFAIL 1 152 # define DH6OPT_STCODE_NOADDRAVAIL 2 153 # define DH6OPT_STCODE_NOBINDING 3 154 # define DH6OPT_STCODE_NOTONLINK 4 155 # define DH6OPT_STCODE_USEMULTICAST 5 156 # define DH6OPT_STCODE_NOPREFIXAVAIL 6 157 # define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7 158 # define DH6OPT_STCODE_MALFORMEDQUERY 8 159 # define DH6OPT_STCODE_NOTCONFIGURED 9 160 # define DH6OPT_STCODE_NOTALLOWED 10 161 #define DH6OPT_RAPID_COMMIT 14 162 #define DH6OPT_USER_CLASS 15 163 #define DH6OPT_VENDOR_CLASS 16 164 #define DH6OPT_VENDOR_OPTS 17 165 #define DH6OPT_INTERFACE_ID 18 166 #define DH6OPT_RECONF_MSG 19 167 #define DH6OPT_RECONF_ACCEPT 20 168 #define DH6OPT_SIP_SERVER_D 21 169 #define DH6OPT_SIP_SERVER_A 22 170 #define DH6OPT_DNS_SERVERS 23 171 #define DH6OPT_DOMAIN_LIST 24 172 #define DH6OPT_IA_PD 25 173 #define DH6OPT_IA_PD_PREFIX 26 174 #define DH6OPT_NIS_SERVERS 27 175 #define DH6OPT_NISP_SERVERS 28 176 #define DH6OPT_NIS_NAME 29 177 #define DH6OPT_NISP_NAME 30 178 #define DH6OPT_SNTP_SERVERS 31 179 #define DH6OPT_LIFETIME 32 180 #define DH6OPT_BCMCS_SERVER_D 33 181 #define DH6OPT_BCMCS_SERVER_A 34 182 #define DH6OPT_GEOCONF_CIVIC 36 183 #define DH6OPT_REMOTE_ID 37 184 #define DH6OPT_SUBSCRIBER_ID 38 185 #define DH6OPT_CLIENT_FQDN 39 186 #define DH6OPT_PANA_AGENT 40 187 #define DH6OPT_NEW_POSIX_TIMEZONE 41 188 #define DH6OPT_NEW_TZDB_TIMEZONE 42 189 #define DH6OPT_ERO 43 190 #define DH6OPT_LQ_QUERY 44 191 #define DH6OPT_CLIENT_DATA 45 192 #define DH6OPT_CLT_TIME 46 193 #define DH6OPT_LQ_RELAY_DATA 47 194 #define DH6OPT_LQ_CLIENT_LINK 48 195 #define DH6OPT_NTP_SERVER 56 196 # define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1 197 # define DH6OPT_NTP_SUBOPTION_MC_ADDR 2 198 # define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3 199 #define DH6OPT_AFTR_NAME 64 200 201 static const struct tok dh6opt_str[] = { 202 { DH6OPT_CLIENTID, "client-ID" }, 203 { DH6OPT_SERVERID, "server-ID" }, 204 { DH6OPT_IA_NA, "IA_NA" }, 205 { DH6OPT_IA_TA, "IA_TA" }, 206 { DH6OPT_IA_ADDR, "IA_ADDR" }, 207 { DH6OPT_ORO, "option-request" }, 208 { DH6OPT_PREFERENCE, "preference" }, 209 { DH6OPT_ELAPSED_TIME, "elapsed-time" }, 210 { DH6OPT_RELAY_MSG, "relay-message" }, 211 { DH6OPT_AUTH, "authentication" }, 212 { DH6OPT_UNICAST, "server-unicast" }, 213 { DH6OPT_STATUS_CODE, "status-code" }, 214 { DH6OPT_RAPID_COMMIT, "rapid-commit" }, 215 { DH6OPT_USER_CLASS, "user-class" }, 216 { DH6OPT_VENDOR_CLASS, "vendor-class" }, 217 { DH6OPT_VENDOR_OPTS, "vendor-specific-info" }, 218 { DH6OPT_INTERFACE_ID, "interface-ID" }, 219 { DH6OPT_RECONF_MSG, "reconfigure-message" }, 220 { DH6OPT_RECONF_ACCEPT, "reconfigure-accept" }, 221 { DH6OPT_SIP_SERVER_D, "SIP-servers-domain" }, 222 { DH6OPT_SIP_SERVER_A, "SIP-servers-address" }, 223 { DH6OPT_DNS_SERVERS, "DNS-server" }, 224 { DH6OPT_DOMAIN_LIST, "DNS-search-list" }, 225 { DH6OPT_IA_PD, "IA_PD" }, 226 { DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" }, 227 { DH6OPT_SNTP_SERVERS, "SNTP-servers" }, 228 { DH6OPT_LIFETIME, "lifetime" }, 229 { DH6OPT_NIS_SERVERS, "NIS-server" }, 230 { DH6OPT_NISP_SERVERS, "NIS+-server" }, 231 { DH6OPT_NIS_NAME, "NIS-domain-name" }, 232 { DH6OPT_NISP_NAME, "NIS+-domain-name" }, 233 { DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" }, 234 { DH6OPT_BCMCS_SERVER_A, "BCMCS-server" }, 235 { DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" }, 236 { DH6OPT_REMOTE_ID, "Remote-ID" }, 237 { DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" }, 238 { DH6OPT_CLIENT_FQDN, "Client-FQDN" }, 239 { DH6OPT_PANA_AGENT, "PANA-agent" }, 240 { DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" }, 241 { DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" }, 242 { DH6OPT_ERO, "Echo-request-option" }, 243 { DH6OPT_LQ_QUERY, "Lease-query" }, 244 { DH6OPT_CLIENT_DATA, "LQ-client-data" }, 245 { DH6OPT_CLT_TIME, "Clt-time" }, 246 { DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" }, 247 { DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" }, 248 { DH6OPT_NTP_SERVER, "NTP-server" }, 249 { DH6OPT_AFTR_NAME, "AFTR-Name" }, 250 { 0, NULL } 251 }; 252 253 static const struct tok dh6opt_stcode_str[] = { 254 { DH6OPT_STCODE_SUCCESS, "success" }, 255 { DH6OPT_STCODE_UNSPECFAIL, "unspec failure" }, 256 { DH6OPT_STCODE_NOADDRAVAIL, "no addresses" }, 257 { DH6OPT_STCODE_NOBINDING, "no binding" }, 258 { DH6OPT_STCODE_NOTONLINK, "not on-link" }, 259 { DH6OPT_STCODE_USEMULTICAST, "use multicast" }, 260 { DH6OPT_STCODE_NOPREFIXAVAIL, "no prefixes" }, 261 { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "unknown query type" }, 262 { DH6OPT_STCODE_MALFORMEDQUERY, "malformed query" }, 263 { DH6OPT_STCODE_NOTCONFIGURED, "not configured" }, 264 { DH6OPT_STCODE_NOTALLOWED, "not allowed" }, 265 { 0, NULL } 266 }; 267 268 struct dhcp6opt { 269 uint16_t dh6opt_type; 270 uint16_t dh6opt_len; 271 /* type-dependent data follows */ 272 }; 273 274 static const char * 275 dhcp6stcode(const uint16_t code) 276 { 277 return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code); 278 } 279 280 static void 281 dhcp6opt_print(netdissect_options *ndo, 282 const u_char *cp, const u_char *ep) 283 { 284 const struct dhcp6opt *dh6o; 285 const u_char *tp; 286 size_t i; 287 uint16_t opttype; 288 size_t optlen; 289 uint8_t auth_proto; 290 u_int authinfolen, authrealmlen; 291 int remain_len; /* Length of remaining options */ 292 int label_len; /* Label length */ 293 uint16_t subopt_code; 294 uint16_t subopt_len; 295 296 if (cp == ep) 297 return; 298 while (cp < ep) { 299 if (ep < cp + sizeof(*dh6o)) 300 goto trunc; 301 dh6o = (struct dhcp6opt *)cp; 302 ND_TCHECK(*dh6o); 303 optlen = EXTRACT_16BITS(&dh6o->dh6opt_len); 304 if (ep < cp + sizeof(*dh6o) + optlen) 305 goto trunc; 306 opttype = EXTRACT_16BITS(&dh6o->dh6opt_type); 307 ND_PRINT((ndo, " (%s", tok2str(dh6opt_str, "opt_%u", opttype))); 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 = (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 = (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 = (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 = (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 = (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 = (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 = (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 = (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 tp = (u_char *)(dh6o + 1); 522 switch (*tp) { 523 case DH6_RENEW: 524 ND_PRINT((ndo, " for renew)")); 525 break; 526 case DH6_INFORM_REQ: 527 ND_PRINT((ndo, " for inf-req)")); 528 break; 529 default: 530 ND_PRINT((ndo, " for ?\?\?(%02x))", *tp)); 531 break; 532 } 533 break; 534 case DH6OPT_RECONF_ACCEPT: /* nothing todo */ 535 ND_PRINT((ndo, ")")); 536 break; 537 case DH6OPT_SIP_SERVER_A: 538 case DH6OPT_DNS_SERVERS: 539 case DH6OPT_SNTP_SERVERS: 540 case DH6OPT_NIS_SERVERS: 541 case DH6OPT_NISP_SERVERS: 542 case DH6OPT_BCMCS_SERVER_A: 543 case DH6OPT_PANA_AGENT: 544 case DH6OPT_LQ_CLIENT_LINK: 545 if (optlen % 16) { 546 ND_PRINT((ndo, " ?)")); 547 break; 548 } 549 tp = (u_char *)(dh6o + 1); 550 for (i = 0; i < optlen; i += 16) 551 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[i]))); 552 ND_PRINT((ndo, ")")); 553 break; 554 case DH6OPT_SIP_SERVER_D: 555 case DH6OPT_DOMAIN_LIST: 556 tp = (u_char *)(dh6o + 1); 557 while (tp < cp + sizeof(*dh6o) + optlen) { 558 ND_PRINT((ndo, " ")); 559 if ((tp = ns_nprint(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL) 560 goto trunc; 561 } 562 ND_PRINT((ndo, ")")); 563 break; 564 case DH6OPT_STATUS_CODE: 565 if (optlen < 2) { 566 ND_PRINT((ndo, " ?)")); 567 break; 568 } 569 tp = (u_char *)(dh6o + 1); 570 ND_PRINT((ndo, " %s)", dhcp6stcode(EXTRACT_16BITS(&tp[0])))); 571 break; 572 case DH6OPT_IA_NA: 573 case DH6OPT_IA_PD: 574 if (optlen < 12) { 575 ND_PRINT((ndo, " ?)")); 576 break; 577 } 578 tp = (u_char *)(dh6o + 1); 579 ND_PRINT((ndo, " IAID:%u T1:%u T2:%u", 580 EXTRACT_32BITS(&tp[0]), 581 EXTRACT_32BITS(&tp[4]), 582 EXTRACT_32BITS(&tp[8]))); 583 if (optlen > 12) { 584 /* there are sub-options */ 585 dhcp6opt_print(ndo, tp + 12, tp + optlen); 586 } 587 ND_PRINT((ndo, ")")); 588 break; 589 case DH6OPT_IA_TA: 590 if (optlen < 4) { 591 ND_PRINT((ndo, " ?)")); 592 break; 593 } 594 tp = (u_char *)(dh6o + 1); 595 ND_PRINT((ndo, " IAID:%u", EXTRACT_32BITS(tp))); 596 if (optlen > 4) { 597 /* there are sub-options */ 598 dhcp6opt_print(ndo, tp + 4, tp + optlen); 599 } 600 ND_PRINT((ndo, ")")); 601 break; 602 case DH6OPT_IA_PD_PREFIX: 603 if (optlen < 25) { 604 ND_PRINT((ndo, " ?)")); 605 break; 606 } 607 tp = (u_char *)(dh6o + 1); 608 ND_PRINT((ndo, " %s/%d", ip6addr_string(ndo, &tp[9]), tp[8])); 609 ND_PRINT((ndo, " pltime:%u vltime:%u", 610 EXTRACT_32BITS(&tp[0]), 611 EXTRACT_32BITS(&tp[4]))); 612 if (optlen > 25) { 613 /* there are sub-options */ 614 dhcp6opt_print(ndo, tp + 25, tp + optlen); 615 } 616 ND_PRINT((ndo, ")")); 617 break; 618 case DH6OPT_LIFETIME: 619 case DH6OPT_CLT_TIME: 620 if (optlen != 4) { 621 ND_PRINT((ndo, " ?)")); 622 break; 623 } 624 tp = (u_char *)(dh6o + 1); 625 ND_PRINT((ndo, " %d)", EXTRACT_32BITS(tp))); 626 break; 627 case DH6OPT_REMOTE_ID: 628 if (optlen < 4) { 629 ND_PRINT((ndo, " ?)")); 630 break; 631 } 632 tp = (u_char *)(dh6o + 1); 633 ND_PRINT((ndo, " %d ", EXTRACT_32BITS(tp))); 634 /* 635 * Print hex dump first 10 characters. 636 */ 637 for (i = 4; i < optlen && i < 14; i++) 638 ND_PRINT((ndo, "%02x", tp[i])); 639 ND_PRINT((ndo, "...)")); 640 break; 641 case DH6OPT_LQ_QUERY: 642 if (optlen < 17) { 643 ND_PRINT((ndo, " ?)")); 644 break; 645 } 646 tp = (u_char *)(dh6o + 1); 647 switch (*tp) { 648 case 1: 649 ND_PRINT((ndo, " by-address")); 650 break; 651 case 2: 652 ND_PRINT((ndo, " by-clientID")); 653 break; 654 default: 655 ND_PRINT((ndo, " type_%d", (int)*tp)); 656 break; 657 } 658 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[1]))); 659 if (optlen > 17) { 660 /* there are query-options */ 661 dhcp6opt_print(ndo, tp + 17, tp + optlen); 662 } 663 ND_PRINT((ndo, ")")); 664 break; 665 case DH6OPT_CLIENT_DATA: 666 tp = (u_char *)(dh6o + 1); 667 if (optlen > 0) { 668 /* there are encapsulated options */ 669 dhcp6opt_print(ndo, tp, tp + optlen); 670 } 671 ND_PRINT((ndo, ")")); 672 break; 673 case DH6OPT_LQ_RELAY_DATA: 674 if (optlen < 16) { 675 ND_PRINT((ndo, " ?)")); 676 break; 677 } 678 tp = (u_char *)(dh6o + 1); 679 ND_PRINT((ndo, " %s ", ip6addr_string(ndo, &tp[0]))); 680 /* 681 * Print hex dump first 10 characters. 682 */ 683 for (i = 16; i < optlen && i < 26; i++) 684 ND_PRINT((ndo, "%02x", tp[i])); 685 ND_PRINT((ndo, "...)")); 686 break; 687 case DH6OPT_NTP_SERVER: 688 if (optlen < 4) { 689 ND_PRINT((ndo, " ?)")); 690 break; 691 } 692 tp = (u_char *)(dh6o + 1); 693 while (tp < cp + sizeof(*dh6o) + optlen - 4) { 694 subopt_code = EXTRACT_16BITS(tp); 695 tp += 2; 696 subopt_len = EXTRACT_16BITS(tp); 697 tp += 2; 698 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen) 699 goto trunc; 700 ND_PRINT((ndo, " subopt:%d", subopt_code)); 701 switch (subopt_code) { 702 case DH6OPT_NTP_SUBOPTION_SRV_ADDR: 703 case DH6OPT_NTP_SUBOPTION_MC_ADDR: 704 if (subopt_len != 16) { 705 ND_PRINT((ndo, " ?")); 706 break; 707 } 708 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0]))); 709 break; 710 case DH6OPT_NTP_SUBOPTION_SRV_FQDN: 711 ND_PRINT((ndo, " ")); 712 if (ns_nprint(ndo, tp, tp + subopt_len) == NULL) 713 goto trunc; 714 break; 715 default: 716 ND_PRINT((ndo, " ?")); 717 break; 718 } 719 tp += subopt_len; 720 } 721 ND_PRINT((ndo, ")")); 722 break; 723 case DH6OPT_AFTR_NAME: 724 if (optlen < 3) { 725 ND_PRINT((ndo, " ?)")); 726 break; 727 } 728 tp = (u_char *)(dh6o + 1); 729 remain_len = optlen; 730 ND_PRINT((ndo, " ")); 731 /* Encoding is described in section 3.1 of RFC 1035 */ 732 while (remain_len && *tp) { 733 label_len = *tp++; 734 if (label_len < remain_len - 1) { 735 ND_PRINT((ndo, "%.*s", label_len, tp)); 736 tp += label_len; 737 remain_len -= (label_len + 1); 738 if(*tp) ND_PRINT((ndo, ".")); 739 } else { 740 ND_PRINT((ndo, " ?")); 741 break; 742 } 743 } 744 ND_PRINT((ndo, ")")); 745 break; 746 default: 747 ND_PRINT((ndo, ")")); 748 break; 749 } 750 751 cp += sizeof(*dh6o) + optlen; 752 } 753 return; 754 755 trunc: 756 ND_PRINT((ndo, "[|dhcp6ext]")); 757 } 758 759 /* 760 * Print dhcp6 packets 761 */ 762 void 763 dhcp6_print(netdissect_options *ndo, 764 const u_char *cp, u_int length) 765 { 766 struct dhcp6 *dh6; 767 struct dhcp6_relay *dh6relay; 768 const u_char *ep; 769 u_char *extp; 770 const char *name; 771 772 ND_PRINT((ndo, "dhcp6")); 773 774 ep = (u_char *)ndo->ndo_snapend; 775 if (cp + length < ep) 776 ep = cp + length; 777 778 dh6 = (struct dhcp6 *)cp; 779 dh6relay = (struct dhcp6_relay *)cp; 780 ND_TCHECK(dh6->dh6_xid); 781 name = tok2str(dh6_msgtype_str, "msgtype-%u", dh6->dh6_msgtype); 782 783 if (!ndo->ndo_vflag) { 784 ND_PRINT((ndo, " %s", name)); 785 return; 786 } 787 788 /* XXX relay agent messages have to be handled differently */ 789 790 ND_PRINT((ndo, " %s (", name)); /*)*/ 791 if (dh6->dh6_msgtype != DH6_RELAY_FORW && 792 dh6->dh6_msgtype != DH6_RELAY_REPLY) { 793 ND_PRINT((ndo, "xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK)); 794 extp = (u_char *)(dh6 + 1); 795 dhcp6opt_print(ndo, extp, ep); 796 } else { /* relay messages */ 797 struct in6_addr addr6; 798 799 ND_TCHECK(dh6relay->dh6relay_peeraddr); 800 801 memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6)); 802 ND_PRINT((ndo, "linkaddr=%s", ip6addr_string(ndo, &addr6))); 803 804 memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6)); 805 ND_PRINT((ndo, " peeraddr=%s", ip6addr_string(ndo, &addr6))); 806 807 dhcp6opt_print(ndo, (u_char *)(dh6relay + 1), ep); 808 } 809 /*(*/ 810 ND_PRINT((ndo, ")")); 811 return; 812 813 trunc: 814 ND_PRINT((ndo, "[|dhcp6]")); 815 } 816