1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 #include <sys/types.h> 27 #include <sys/systm.h> 28 #include <sys/stream.h> 29 #include <sys/cmn_err.h> 30 #include <sys/md5.h> 31 #include <sys/kmem.h> 32 #include <sys/strsubr.h> 33 #include <sys/random.h> 34 #include <sys/tsol/tnet.h> 35 36 #include <netinet/in.h> 37 #include <netinet/ip6.h> 38 39 #include <inet/common.h> 40 #include <inet/ip.h> 41 #include <inet/ip6.h> 42 #include <inet/ipsec_impl.h> 43 #include <inet/sctp_ip.h> 44 #include <inet/ipclassifier.h> 45 #include "sctp_impl.h" 46 47 /* 48 * Helper function for SunCluster (PSARC/2005/602) to get the original source 49 * address from the COOKIE 50 */ 51 int cl_sctp_cookie_paddr(sctp_chunk_hdr_t *, in6_addr_t *); 52 53 /* 54 * From RFC 2104. This should probably go into libmd5 (and while 55 * we're at it, maybe we should make a libdigest so we can later 56 * add SHA1 and others, esp. since some weaknesses have been found 57 * with MD5). 58 * 59 * text IN pointer to data stream 60 * text_len IN length of data stream 61 * key IN pointer to authentication key 62 * key_len IN length of authentication key 63 * digest OUT caller digest to be filled in 64 */ 65 static void 66 hmac_md5(uchar_t *text, size_t text_len, uchar_t *key, size_t key_len, 67 uchar_t *digest) 68 { 69 MD5_CTX context; 70 uchar_t k_ipad[65]; /* inner padding - key XORd with ipad */ 71 uchar_t k_opad[65]; /* outer padding - key XORd with opad */ 72 uchar_t tk[16]; 73 int i; 74 75 /* if key is longer than 64 bytes reset it to key=MD5(key) */ 76 if (key_len > 64) { 77 MD5_CTX tctx; 78 79 MD5Init(&tctx); 80 MD5Update(&tctx, key, key_len); 81 MD5Final(tk, &tctx); 82 83 key = tk; 84 key_len = 16; 85 } 86 87 /* 88 * the HMAC_MD5 transform looks like: 89 * 90 * MD5(K XOR opad, MD5(K XOR ipad, text)) 91 * 92 * where K is an n byte key 93 * ipad is the byte 0x36 repeated 64 times 94 * opad is the byte 0x5c repeated 64 times 95 * and text is the data being protected 96 */ 97 98 /* start out by storing key in pads */ 99 bzero(k_ipad, sizeof (k_ipad)); 100 bzero(k_opad, sizeof (k_opad)); 101 bcopy(key, k_ipad, key_len); 102 bcopy(key, k_opad, key_len); 103 104 /* XOR key with ipad and opad values */ 105 for (i = 0; i < 64; i++) { 106 k_ipad[i] ^= 0x36; 107 k_opad[i] ^= 0x5c; 108 } 109 /* 110 * perform inner MD5 111 */ 112 MD5Init(&context); /* init context for 1st */ 113 /* pass */ 114 MD5Update(&context, k_ipad, 64); /* start with inner pad */ 115 MD5Update(&context, text, text_len); /* then text of datagram */ 116 MD5Final(digest, &context); /* finish up 1st pass */ 117 /* 118 * perform outer MD5 119 */ 120 MD5Init(&context); /* init context for 2nd */ 121 /* pass */ 122 MD5Update(&context, k_opad, 64); /* start with outer pad */ 123 MD5Update(&context, digest, 16); /* then results of 1st */ 124 /* hash */ 125 MD5Final(digest, &context); /* finish up 2nd pass */ 126 } 127 128 /* 129 * If inmp is non-NULL, and we need to abort, it will use the IP/SCTP 130 * info in initmp to send the abort. Otherwise, no abort will be sent. 131 * 132 * When called from stcp_send_initack() while processing parameters 133 * from a received INIT_CHUNK want_cookie will be NULL. 134 * 135 * When called from sctp_send_cookie_echo() while processing an INIT_ACK, 136 * want_cookie contains a pointer to a pointer of type *sctp_parm_hdr_t. 137 * However, this last pointer will be NULL until the cookie is processed 138 * at which time it will be set to point to a sctp_parm_hdr_t that contains 139 * the cookie info. 140 * 141 * Note: an INIT_ACK is expected to contain a cookie. 142 * 143 * When processing an INIT_ACK, an ERROR chunk and chain of one or more 144 * error CAUSE blocks will be created if unrecognized parameters marked by 145 * the sender as reportable are found. 146 * 147 * When processing an INIT chunk, a chain of one or more error CAUSE blocks 148 * will be created if unrecognized parameters marked by the sender as 149 * reportable are found. These are appended directly to the INIT_ACK chunk. 150 * 151 * In both cases the error chain is visible to the caller via *errmp. 152 * 153 * Returns 1 if the parameters are OK (or if there are no optional 154 * parameters), returns 0 otherwise. 155 */ 156 static int 157 validate_init_params(sctp_t *sctp, sctp_chunk_hdr_t *ch, 158 sctp_init_chunk_t *init, mblk_t *inmp, sctp_parm_hdr_t **want_cookie, 159 mblk_t **errmp, int *supp_af, uint_t *sctp_options, ip_recv_attr_t *ira) 160 { 161 sctp_parm_hdr_t *cph; 162 sctp_init_chunk_t *ic; 163 ssize_t remaining; 164 uint16_t serror = 0; 165 char *details = NULL; 166 size_t errlen = 0; 167 boolean_t got_cookie = B_FALSE; 168 boolean_t got_errchunk = B_FALSE; 169 uint16_t ptype; 170 sctp_mpc_t mpc; 171 conn_t *connp = sctp->sctp_connp; 172 173 174 ASSERT(errmp != NULL); 175 176 if (sctp_options != NULL) 177 *sctp_options = 0; 178 179 /* First validate stream parameters */ 180 if (init->sic_instr == 0 || init->sic_outstr == 0) { 181 serror = SCTP_ERR_BAD_MANDPARM; 182 dprint(1, ("validate_init_params: bad sid, is=%d os=%d\n", 183 htons(init->sic_instr), htons(init->sic_outstr))); 184 goto abort; 185 } 186 if (ntohl(init->sic_inittag) == 0) { 187 serror = SCTP_ERR_BAD_MANDPARM; 188 dprint(1, ("validate_init_params: inittag = 0\n")); 189 goto abort; 190 } 191 192 remaining = ntohs(ch->sch_len) - sizeof (*ch); 193 ic = (sctp_init_chunk_t *)(ch + 1); 194 remaining -= sizeof (*ic); 195 if (remaining < sizeof (*cph)) { 196 /* 197 * When processing a received INIT_ACK, a cookie is 198 * expected, if missing there is nothing to validate. 199 */ 200 if (want_cookie != NULL) 201 goto cookie_abort; 202 return (1); 203 } 204 205 cph = (sctp_parm_hdr_t *)(ic + 1); 206 207 while (cph != NULL) { 208 ptype = ntohs(cph->sph_type); 209 switch (ptype) { 210 case PARM_HBINFO: 211 case PARM_UNRECOGNIZED: 212 case PARM_ECN: 213 /* just ignore them */ 214 break; 215 case PARM_FORWARD_TSN: 216 if (sctp_options != NULL) 217 *sctp_options |= SCTP_PRSCTP_OPTION; 218 break; 219 case PARM_COOKIE: 220 got_cookie = B_TRUE; 221 /* 222 * Processing a received INIT_ACK, we have a cookie 223 * and a valid pointer in our caller to attach it to. 224 */ 225 if (want_cookie != NULL) { 226 *want_cookie = cph; 227 } 228 break; 229 case PARM_ADDR4: 230 *supp_af |= PARM_SUPP_V4; 231 break; 232 case PARM_ADDR6: 233 *supp_af |= PARM_SUPP_V6; 234 break; 235 case PARM_COOKIE_PRESERVE: 236 case PARM_ADAPT_LAYER_IND: 237 /* These are OK */ 238 break; 239 case PARM_ADDR_HOST_NAME: 240 /* Don't support this; abort the association */ 241 serror = SCTP_ERR_BAD_ADDR; 242 details = (char *)cph; 243 errlen = ntohs(cph->sph_len); 244 dprint(1, ("sctp:validate_init_params: host addr\n")); 245 goto abort; 246 case PARM_SUPP_ADDRS: { 247 /* Make sure we have a supported addr intersection */ 248 uint16_t *p, addrtype; 249 int plen; 250 251 plen = ntohs(cph->sph_len); 252 p = (uint16_t *)(cph + 1); 253 while (plen > 0) { 254 addrtype = ntohs(*p); 255 switch (addrtype) { 256 case PARM_ADDR6: 257 *supp_af |= PARM_SUPP_V6; 258 break; 259 case PARM_ADDR4: 260 *supp_af |= PARM_SUPP_V4; 261 break; 262 default: 263 /* 264 * Do nothing, silently ignore hostname 265 * address. 266 */ 267 break; 268 } 269 p++; 270 plen -= sizeof (*p); 271 } 272 break; 273 } 274 default: 275 /* 276 * Handle any unrecognized params, the two high order 277 * bits of ptype define how the remote wants them 278 * handled. 279 * Top bit: 280 * 1. Continue processing other params in the chunk 281 * 0. Stop processing params after this one. 282 * 2nd bit: 283 * 1. Must report this unrecognized param to remote 284 * 0. Obey the top bit silently. 285 */ 286 if (ptype & SCTP_REPORT_THIS_PARAM) { 287 if (!got_errchunk && want_cookie != NULL) { 288 /* 289 * The incoming pointer want_cookie is 290 * NULL so processing an INIT_ACK. 291 * This is the first reportable param, 292 * create an ERROR chunk and populate 293 * it with a CAUSE block for this parm. 294 */ 295 *errmp = sctp_make_err(sctp, 296 PARM_UNRECOGNIZED, 297 (void *)cph, 298 ntohs(cph->sph_len)); 299 got_errchunk = B_TRUE; 300 } else { 301 /* 302 * If processing an INIT_ACK, we already 303 * have an ERROR chunk, just add a new 304 * CAUSE block and update ERROR chunk 305 * length. 306 * If processing an INIT chunk add a new 307 * CAUSE block to the INIT_ACK, in this 308 * case there is no ERROR chunk thus 309 * got_errchunk will be B_FALSE. Chunk 310 * length is computed by our caller. 311 */ 312 sctp_add_unrec_parm(cph, errmp, 313 got_errchunk); 314 } 315 } 316 if (ptype & SCTP_CONT_PROC_PARAMS) { 317 /* 318 * Continue processing params after this 319 * parameter. 320 */ 321 break; 322 } 323 324 /* 325 * Stop processing params, report any reportable 326 * unrecognized params found so far. 327 */ 328 goto done; 329 } 330 331 cph = sctp_next_parm(cph, &remaining); 332 } 333 done: 334 /* 335 * Some sanity checks. The following should not fail unless the 336 * other side is broken. 337 * 338 * 1. If this is a V4 endpoint but V4 address is not 339 * supported, abort. 340 * 2. If this is a V6 only endpoint but V6 address is 341 * not supported, abort. This assumes that a V6 342 * endpoint can use both V4 and V6 addresses. 343 * We only care about supp_af when processing INIT, i.e want_cookie 344 * is NULL. 345 */ 346 if (want_cookie == NULL && 347 ((connp->conn_family == AF_INET && !(*supp_af & PARM_SUPP_V4)) || 348 (connp->conn_family == AF_INET6 && !(*supp_af & PARM_SUPP_V6) && 349 sctp->sctp_connp->conn_ipv6_v6only))) { 350 dprint(1, ("sctp:validate_init_params: supp addr\n")); 351 serror = SCTP_ERR_BAD_ADDR; 352 goto abort; 353 } 354 355 if (want_cookie != NULL && !got_cookie) { 356 cookie_abort: 357 /* Will populate the CAUSE block in the ABORT chunk. */ 358 mpc.mpc_num = htons(1); 359 mpc.mpc_param = htons(PARM_COOKIE); 360 mpc.mpc_pad = 0; 361 362 dprint(1, ("validate_init_params: cookie absent\n")); 363 sctp_send_abort(sctp, sctp_init2vtag(ch), SCTP_ERR_MISSING_PARM, 364 (char *)&mpc, sizeof (sctp_mpc_t), inmp, 0, B_FALSE, ira); 365 return (0); 366 } 367 368 /* OK */ 369 return (1); 370 371 abort: 372 if (want_cookie != NULL) 373 return (0); 374 375 sctp_send_abort(sctp, sctp_init2vtag(ch), serror, details, 376 errlen, inmp, 0, B_FALSE, ira); 377 return (0); 378 } 379 380 /* 381 * Initialize params from the INIT and INIT-ACK when the assoc. is 382 * established. 383 */ 384 boolean_t 385 sctp_initialize_params(sctp_t *sctp, sctp_init_chunk_t *init, 386 sctp_init_chunk_t *iack) 387 { 388 /* Get initial TSN */ 389 sctp->sctp_ftsn = ntohl(init->sic_inittsn); 390 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 391 392 /* Serial number is initialized to the same value as the TSN */ 393 sctp->sctp_fcsn = sctp->sctp_lastacked; 394 395 /* 396 * Get verification tags; no byteordering is necessary, since 397 * verfication tags are never processed except for byte-by-byte 398 * comparisons. 399 */ 400 sctp->sctp_fvtag = init->sic_inittag; 401 sctp->sctp_sctph->sh_verf = init->sic_inittag; 402 sctp->sctp_sctph6->sh_verf = init->sic_inittag; 403 sctp->sctp_lvtag = iack->sic_inittag; 404 405 /* Get the peer's rwnd */ 406 sctp->sctp_frwnd = ntohl(init->sic_a_rwnd); 407 408 /* Allocate the in/out-stream counters */ 409 sctp->sctp_num_ostr = iack->sic_outstr; 410 sctp->sctp_ostrcntrs = kmem_zalloc(sizeof (uint16_t) * 411 sctp->sctp_num_ostr, KM_NOSLEEP); 412 if (sctp->sctp_ostrcntrs == NULL) 413 return (B_FALSE); 414 415 sctp->sctp_num_istr = iack->sic_instr; 416 sctp->sctp_instr = kmem_zalloc(sizeof (*sctp->sctp_instr) * 417 sctp->sctp_num_istr, KM_NOSLEEP); 418 if (sctp->sctp_instr == NULL) { 419 kmem_free(sctp->sctp_ostrcntrs, sizeof (uint16_t) * 420 sctp->sctp_num_ostr); 421 sctp->sctp_ostrcntrs = NULL; 422 return (B_FALSE); 423 } 424 return (B_TRUE); 425 } 426 427 /* 428 * Copy the peer's original source address into addr. This relies on the 429 * following format (see sctp_send_initack() below): 430 * relative timestamp for the cookie (int64_t) + 431 * cookie lifetime (uint32_t) + 432 * local tie-tag (uint32_t) + peer tie-tag (uint32_t) + 433 * Peer's original src ... 434 */ 435 int 436 cl_sctp_cookie_paddr(sctp_chunk_hdr_t *ch, in6_addr_t *addr) 437 { 438 uchar_t *off; 439 440 ASSERT(addr != NULL); 441 442 if (ch->sch_id != CHUNK_COOKIE) 443 return (EINVAL); 444 445 off = (uchar_t *)ch + sizeof (*ch) + sizeof (int64_t) + 446 sizeof (uint32_t) + sizeof (uint32_t) + sizeof (uint32_t); 447 448 bcopy(off, addr, sizeof (*addr)); 449 450 return (0); 451 } 452 453 #define SCTP_CALC_COOKIE_LEN(initcp) \ 454 sizeof (int64_t) + /* timestamp */ \ 455 sizeof (uint32_t) + /* cookie lifetime */ \ 456 sizeof (sctp_init_chunk_t) + /* INIT ACK */ \ 457 sizeof (in6_addr_t) + /* peer's original source */ \ 458 ntohs((initcp)->sch_len) + /* peer's INIT */ \ 459 sizeof (uint32_t) + /* local tie-tag */ \ 460 sizeof (uint32_t) + /* peer tie-tag */ \ 461 sizeof (sctp_parm_hdr_t) + /* param header */ \ 462 16 /* MD5 hash */ 463 464 /* 465 * Note that sctp is the listener, hence we shouldn't modify it. 466 */ 467 void 468 sctp_send_initack(sctp_t *sctp, sctp_hdr_t *initsh, sctp_chunk_hdr_t *ch, 469 mblk_t *initmp, ip_recv_attr_t *ira) 470 { 471 ipha_t *initiph; 472 ip6_t *initip6h; 473 ipha_t *iackiph = NULL; 474 ip6_t *iackip6h = NULL; 475 sctp_chunk_hdr_t *iack_ch; 476 sctp_init_chunk_t *iack; 477 sctp_init_chunk_t *init; 478 sctp_hdr_t *iacksh; 479 size_t cookielen; 480 size_t iacklen; 481 size_t ipsctplen; 482 size_t errlen = 0; 483 sctp_parm_hdr_t *cookieph; 484 mblk_t *iackmp; 485 uint32_t itag; 486 uint32_t itsn; 487 int64_t *now; 488 int64_t nowt; 489 uint32_t *lifetime; 490 char *p; 491 boolean_t isv4; 492 int supp_af = 0; 493 uint_t sctp_options; 494 uint32_t *ttag; 495 int pad; 496 mblk_t *errmp = NULL; 497 boolean_t initcollision = B_FALSE; 498 boolean_t linklocal = B_FALSE; 499 sctp_stack_t *sctps = sctp->sctp_sctps; 500 conn_t *connp = sctp->sctp_connp; 501 int err; 502 ip_xmit_attr_t *ixa = NULL; 503 504 BUMP_LOCAL(sctp->sctp_ibchunks); 505 isv4 = (IPH_HDR_VERSION(initmp->b_rptr) == IPV4_VERSION); 506 507 /* Extract the INIT chunk */ 508 if (isv4) { 509 initiph = (ipha_t *)initmp->b_rptr; 510 ipsctplen = sctp->sctp_ip_hdr_len; 511 supp_af |= PARM_SUPP_V4; 512 } else { 513 initip6h = (ip6_t *)initmp->b_rptr; 514 ipsctplen = sctp->sctp_ip_hdr6_len; 515 if (IN6_IS_ADDR_LINKLOCAL(&initip6h->ip6_src) || 516 IN6_IS_ADDR_LINKLOCAL(&initip6h->ip6_dst)) 517 linklocal = B_TRUE; 518 supp_af |= PARM_SUPP_V6; 519 if (!sctp->sctp_connp->conn_ipv6_v6only) 520 supp_af |= PARM_SUPP_V4; 521 } 522 ASSERT(OK_32PTR(initsh)); 523 init = (sctp_init_chunk_t *)((char *)(initsh + 1) + sizeof (*iack_ch)); 524 525 /* Make sure we like the peer's parameters */ 526 if (validate_init_params(sctp, ch, init, initmp, NULL, &errmp, 527 &supp_af, &sctp_options, ira) == 0) { 528 return; 529 } 530 if (errmp != NULL) 531 errlen = msgdsize(errmp); 532 if (connp->conn_family == AF_INET) { 533 /* 534 * Regardless of the supported address in the INIT, v4 535 * must be supported. 536 */ 537 supp_af = PARM_SUPP_V4; 538 } 539 if (sctp->sctp_state <= SCTPS_LISTEN) { 540 /* normal, expected INIT: generate new vtag and itsn */ 541 (void) random_get_pseudo_bytes((uint8_t *)&itag, sizeof (itag)); 542 if (itag == 0) 543 itag = (uint32_t)gethrtime(); 544 itsn = itag + 1; 545 itag = htonl(itag); 546 } else if (sctp->sctp_state == SCTPS_COOKIE_WAIT || 547 sctp->sctp_state == SCTPS_COOKIE_ECHOED) { 548 /* init collision; copy vtag and itsn from sctp */ 549 itag = sctp->sctp_lvtag; 550 itsn = sctp->sctp_ltsn; 551 /* 552 * In addition we need to send all the params that was sent 553 * in our INIT chunk. Essentially, it is only the supported 554 * address params that we need to add. 555 */ 556 initcollision = B_TRUE; 557 /* 558 * When we sent the INIT, we should have set linklocal in 559 * the sctp which should be good enough. 560 */ 561 if (linklocal) 562 linklocal = B_FALSE; 563 } else { 564 /* peer restart; generate new vtag but keep everything else */ 565 (void) random_get_pseudo_bytes((uint8_t *)&itag, sizeof (itag)); 566 if (itag == 0) 567 itag = (uint32_t)gethrtime(); 568 itag = htonl(itag); 569 itsn = sctp->sctp_ltsn; 570 } 571 572 /* 573 * Allocate a mblk for the INIT ACK, consisting of the link layer 574 * header, the IP header, the SCTP common header, and INIT ACK chunk, 575 * and finally the COOKIE parameter. 576 */ 577 cookielen = SCTP_CALC_COOKIE_LEN(ch); 578 iacklen = sizeof (*iack_ch) + sizeof (*iack) + cookielen; 579 if (sctp->sctp_send_adaptation) 580 iacklen += (sizeof (sctp_parm_hdr_t) + sizeof (uint32_t)); 581 if (((sctp_options & SCTP_PRSCTP_OPTION) || initcollision) && 582 sctp->sctp_prsctp_aware && sctps->sctps_prsctp_enabled) { 583 iacklen += sctp_options_param_len(sctp, SCTP_PRSCTP_OPTION); 584 } 585 if (initcollision) 586 iacklen += sctp_supaddr_param_len(sctp); 587 if (!linklocal) 588 iacklen += sctp_addr_params(sctp, supp_af, NULL, B_FALSE); 589 ipsctplen += sizeof (*iacksh) + iacklen; 590 iacklen += errlen; 591 /* 592 * Padding is applied after the cookie which is the end of chunk 593 * unless CAUSE blocks are appended when the pad must also be 594 * accounted for in iacklen. 595 */ 596 if ((pad = ipsctplen % SCTP_ALIGN) != 0) { 597 pad = SCTP_ALIGN - pad; 598 ipsctplen += pad; 599 if (errmp != NULL) 600 iacklen += pad; 601 } 602 603 /* 604 * Base the transmission on any routing-related socket options 605 * that have been set on the listener. 606 */ 607 ixa = conn_get_ixa_exclusive(connp); 608 if (ixa == NULL) { 609 sctp_send_abort(sctp, sctp_init2vtag(ch), 610 SCTP_ERR_NO_RESOURCES, NULL, 0, initmp, 0, B_FALSE, ira); 611 return; 612 } 613 ixa->ixa_flags &= ~IXAF_VERIFY_PMTU; 614 615 if (isv4) 616 ixa->ixa_flags |= IXAF_IS_IPV4; 617 else 618 ixa->ixa_flags &= ~IXAF_IS_IPV4; 619 620 /* 621 * If the listen socket is bound to a trusted extensions multi-label 622 * port, a MAC-Exempt connection with an unlabeled node, we use the 623 * the security label of the received INIT packet. 624 * If not a multi-label port, attach the unmodified 625 * listener's label directly. 626 * 627 * We expect Sun developed kernel modules to properly set 628 * cred labels for sctp connections. We can't be so sure this 629 * will be done correctly when 3rd party kernel modules 630 * directly use sctp. We check for a NULL ira_tsl to cover this 631 * possibility. 632 */ 633 if (is_system_labeled()) { 634 /* Discard any old label */ 635 if (ixa->ixa_free_flags & IXA_FREE_TSL) { 636 ASSERT(ixa->ixa_tsl != NULL); 637 label_rele(ixa->ixa_tsl); 638 ixa->ixa_free_flags &= ~IXA_FREE_TSL; 639 ixa->ixa_tsl = NULL; 640 } 641 642 if (connp->conn_mlp_type != mlptSingle || 643 connp->conn_mac_mode != CONN_MAC_DEFAULT) { 644 if (ira->ira_tsl == NULL) { 645 sctp_send_abort(sctp, sctp_init2vtag(ch), 646 SCTP_ERR_UNKNOWN, NULL, 0, initmp, 0, 647 B_FALSE, ira); 648 ixa_refrele(ixa); 649 return; 650 } 651 label_hold(ira->ira_tsl); 652 ip_xmit_attr_replace_tsl(ixa, ira->ira_tsl); 653 } else { 654 ixa->ixa_tsl = crgetlabel(connp->conn_cred); 655 } 656 } 657 658 iackmp = allocb(ipsctplen + sctps->sctps_wroff_xtra, BPRI_MED); 659 if (iackmp == NULL) { 660 sctp_send_abort(sctp, sctp_init2vtag(ch), 661 SCTP_ERR_NO_RESOURCES, NULL, 0, initmp, 0, B_FALSE, ira); 662 ixa_refrele(ixa); 663 return; 664 } 665 666 /* Copy in the [imcomplete] IP/SCTP composite header */ 667 p = (char *)(iackmp->b_rptr + sctps->sctps_wroff_xtra); 668 iackmp->b_rptr = (uchar_t *)p; 669 if (isv4) { 670 bcopy(sctp->sctp_iphc, p, sctp->sctp_hdr_len); 671 iackiph = (ipha_t *)p; 672 673 /* Copy the peer's IP addr */ 674 iackiph->ipha_dst = initiph->ipha_src; 675 iackiph->ipha_src = initiph->ipha_dst; 676 iackiph->ipha_length = htons(ipsctplen + errlen); 677 iacksh = (sctp_hdr_t *)(p + sctp->sctp_ip_hdr_len); 678 ixa->ixa_ip_hdr_length = sctp->sctp_ip_hdr_len; 679 } else { 680 bcopy(sctp->sctp_iphc6, p, sctp->sctp_hdr6_len); 681 iackip6h = (ip6_t *)p; 682 683 /* Copy the peer's IP addr */ 684 iackip6h->ip6_dst = initip6h->ip6_src; 685 iackip6h->ip6_src = initip6h->ip6_dst; 686 iackip6h->ip6_plen = htons(ipsctplen + errlen - IPV6_HDR_LEN); 687 iacksh = (sctp_hdr_t *)(p + sctp->sctp_ip_hdr6_len); 688 ixa->ixa_ip_hdr_length = sctp->sctp_ip_hdr6_len; 689 } 690 ixa->ixa_pktlen = ipsctplen + errlen; 691 692 ASSERT(OK_32PTR(iacksh)); 693 694 /* Fill in the holes in the SCTP common header */ 695 iacksh->sh_sport = initsh->sh_dport; 696 iacksh->sh_dport = initsh->sh_sport; 697 iacksh->sh_verf = init->sic_inittag; 698 699 /* INIT ACK chunk header */ 700 iack_ch = (sctp_chunk_hdr_t *)(iacksh + 1); 701 iack_ch->sch_id = CHUNK_INIT_ACK; 702 iack_ch->sch_flags = 0; 703 iack_ch->sch_len = htons(iacklen); 704 705 /* The INIT ACK itself */ 706 iack = (sctp_init_chunk_t *)(iack_ch + 1); 707 iack->sic_inittag = itag; /* already in network byteorder */ 708 iack->sic_inittsn = htonl(itsn); 709 710 iack->sic_a_rwnd = htonl(sctp->sctp_rwnd); 711 /* Advertise what we would want to have as stream #'s */ 712 iack->sic_outstr = htons(MIN(sctp->sctp_num_ostr, 713 ntohs(init->sic_instr))); 714 iack->sic_instr = htons(sctp->sctp_num_istr); 715 716 p = (char *)(iack + 1); 717 p += sctp_adaptation_code_param(sctp, (uchar_t *)p); 718 if (initcollision) 719 p += sctp_supaddr_param(sctp, (uchar_t *)p); 720 if (!linklocal) 721 p += sctp_addr_params(sctp, supp_af, (uchar_t *)p, B_FALSE); 722 if (((sctp_options & SCTP_PRSCTP_OPTION) || initcollision) && 723 sctp->sctp_prsctp_aware && sctps->sctps_prsctp_enabled) { 724 p += sctp_options_param(sctp, p, SCTP_PRSCTP_OPTION); 725 } 726 /* 727 * Generate and lay in the COOKIE parameter. 728 * 729 * Any change here that results in a change of location for 730 * the peer's orig source address must be propagated to the fn 731 * cl_sctp_cookie_paddr() above. 732 * 733 * The cookie consists of: 734 * 1. The relative timestamp for the cookie (lbolt64) 735 * 2. The cookie lifetime (uint32_t) in tick 736 * 3. The local tie-tag 737 * 4. The peer tie-tag 738 * 5. Peer's original src, used to confirm the validity of address. 739 * 6. Our INIT ACK chunk, less any parameters 740 * 7. The INIT chunk (may contain parameters) 741 * 8. 128-bit MD5 signature. 742 * 743 * Since the timestamp values will only be evaluated locally, we 744 * don't need to worry about byte-ordering them. 745 */ 746 cookieph = (sctp_parm_hdr_t *)p; 747 cookieph->sph_type = htons(PARM_COOKIE); 748 cookieph->sph_len = htons(cookielen); 749 750 /* timestamp */ 751 now = (int64_t *)(cookieph + 1); 752 nowt = LBOLT_FASTPATH64; 753 bcopy(&nowt, now, sizeof (*now)); 754 755 /* cookie lifetime -- need configuration */ 756 lifetime = (uint32_t *)(now + 1); 757 *lifetime = sctp->sctp_cookie_lifetime; 758 759 /* Set the tie-tags */ 760 ttag = (uint32_t *)(lifetime + 1); 761 if (sctp->sctp_state <= SCTPS_COOKIE_WAIT) { 762 *ttag = 0; 763 ttag++; 764 *ttag = 0; 765 ttag++; 766 } else { 767 /* local tie-tag (network byte-order) */ 768 *ttag = sctp->sctp_lvtag; 769 ttag++; 770 /* peer tie-tag (network byte-order) */ 771 *ttag = sctp->sctp_fvtag; 772 ttag++; 773 } 774 /* 775 * Copy in peer's original source address so that we can confirm 776 * the reachability later. 777 */ 778 p = (char *)ttag; 779 if (isv4) { 780 in6_addr_t peer_addr; 781 782 IN6_IPADDR_TO_V4MAPPED(iackiph->ipha_dst, &peer_addr); 783 bcopy(&peer_addr, p, sizeof (in6_addr_t)); 784 } else { 785 bcopy(&iackip6h->ip6_dst, p, sizeof (in6_addr_t)); 786 } 787 p += sizeof (in6_addr_t); 788 /* Copy in our INIT ACK chunk */ 789 bcopy(iack, p, sizeof (*iack)); 790 iack = (sctp_init_chunk_t *)p; 791 /* Set the # of streams we'll end up using */ 792 iack->sic_outstr = MIN(sctp->sctp_num_ostr, ntohs(init->sic_instr)); 793 iack->sic_instr = MIN(sctp->sctp_num_istr, ntohs(init->sic_outstr)); 794 p += sizeof (*iack); 795 796 /* Copy in the peer's INIT chunk */ 797 bcopy(ch, p, ntohs(ch->sch_len)); 798 p += ntohs(ch->sch_len); 799 800 /* 801 * Calculate the HMAC ICV into the digest slot in buf. 802 * First, generate a new secret if the current secret is 803 * older than the new secret lifetime parameter permits, 804 * copying the current secret to sctp_old_secret. 805 */ 806 if (sctps->sctps_new_secret_interval > 0 && 807 (sctp->sctp_last_secret_update + 808 MSEC_TO_TICK(sctps->sctps_new_secret_interval)) <= nowt) { 809 bcopy(sctp->sctp_secret, sctp->sctp_old_secret, 810 SCTP_SECRET_LEN); 811 (void) random_get_pseudo_bytes(sctp->sctp_secret, 812 SCTP_SECRET_LEN); 813 sctp->sctp_last_secret_update = nowt; 814 } 815 816 hmac_md5((uchar_t *)now, cookielen - sizeof (*cookieph) - 16, 817 (uchar_t *)sctp->sctp_secret, SCTP_SECRET_LEN, (uchar_t *)p); 818 819 iackmp->b_wptr = iackmp->b_rptr + ipsctplen; 820 if (pad != 0) 821 bzero((iackmp->b_wptr - pad), pad); 822 823 iackmp->b_cont = errmp; /* OK if NULL */ 824 825 if (is_system_labeled()) { 826 ts_label_t *effective_tsl = NULL; 827 828 ASSERT(ira->ira_tsl != NULL); 829 830 /* Discard any old label */ 831 if (ixa->ixa_free_flags & IXA_FREE_TSL) { 832 ASSERT(ixa->ixa_tsl != NULL); 833 label_rele(ixa->ixa_tsl); 834 ixa->ixa_free_flags &= ~IXA_FREE_TSL; 835 } 836 ixa->ixa_tsl = ira->ira_tsl; /* A multi-level responder */ 837 838 /* 839 * We need to check for label-related failures which implies 840 * an extra call to tsol_check_dest (as ip_output_simple 841 * also does a tsol_check_dest as part of computing the 842 * label for the packet, but ip_output_simple doesn't return 843 * a specific errno for that case so we can't rely on its 844 * check.) 845 */ 846 if (isv4) { 847 err = tsol_check_dest(ixa->ixa_tsl, &iackiph->ipha_dst, 848 IPV4_VERSION, connp->conn_mac_mode, 849 connp->conn_zone_is_global, &effective_tsl); 850 } else { 851 err = tsol_check_dest(ixa->ixa_tsl, &iackip6h->ip6_dst, 852 IPV6_VERSION, connp->conn_mac_mode, 853 connp->conn_zone_is_global, &effective_tsl); 854 } 855 if (err != 0) { 856 sctp_send_abort(sctp, sctp_init2vtag(ch), 857 SCTP_ERR_AUTH_ERR, NULL, 0, initmp, 0, B_FALSE, 858 ira); 859 ixa_refrele(ixa); 860 freemsg(iackmp); 861 return; 862 } 863 if (effective_tsl != NULL) { 864 /* 865 * Since ip_output_simple will redo the 866 * tsol_check_dest, we just drop the ref. 867 */ 868 label_rele(effective_tsl); 869 } 870 } 871 872 BUMP_LOCAL(sctp->sctp_opkts); 873 BUMP_LOCAL(sctp->sctp_obchunks); 874 875 (void) ip_output_simple(iackmp, ixa); 876 ixa_refrele(ixa); 877 } 878 879 void 880 sctp_send_cookie_ack(sctp_t *sctp) 881 { 882 sctp_chunk_hdr_t *cach; 883 mblk_t *camp; 884 sctp_stack_t *sctps = sctp->sctp_sctps; 885 886 camp = sctp_make_mp(sctp, sctp->sctp_current, sizeof (*cach)); 887 if (camp == NULL) { 888 /* XXX should abort, but don't have the inmp anymore */ 889 SCTP_KSTAT(sctps, sctp_send_cookie_ack_failed); 890 return; 891 } 892 893 cach = (sctp_chunk_hdr_t *)camp->b_wptr; 894 camp->b_wptr = (uchar_t *)(cach + 1); 895 cach->sch_id = CHUNK_COOKIE_ACK; 896 cach->sch_flags = 0; 897 cach->sch_len = htons(sizeof (*cach)); 898 899 BUMP_LOCAL(sctp->sctp_obchunks); 900 901 sctp_set_iplen(sctp, camp, sctp->sctp_current->sf_ixa); 902 (void) conn_ip_output(camp, sctp->sctp_current->sf_ixa); 903 BUMP_LOCAL(sctp->sctp_opkts); 904 } 905 906 static int 907 sctp_find_al_ind(sctp_parm_hdr_t *sph, ssize_t len, uint32_t *adaptation_code) 908 { 909 910 if (len < sizeof (*sph)) 911 return (-1); 912 while (sph != NULL) { 913 if (sph->sph_type == htons(PARM_ADAPT_LAYER_IND) && 914 ntohs(sph->sph_len) >= (sizeof (*sph) + 915 sizeof (uint32_t))) { 916 *adaptation_code = *(uint32_t *)(sph + 1); 917 return (0); 918 } 919 sph = sctp_next_parm(sph, &len); 920 } 921 return (-1); 922 } 923 924 void 925 sctp_send_cookie_echo(sctp_t *sctp, sctp_chunk_hdr_t *iackch, mblk_t *iackmp, 926 ip_recv_attr_t *ira) 927 { 928 mblk_t *cemp; 929 mblk_t *mp = NULL; 930 mblk_t *head; 931 mblk_t *meta; 932 sctp_faddr_t *fp; 933 sctp_chunk_hdr_t *cech; 934 sctp_init_chunk_t *iack; 935 int32_t cansend; 936 int32_t seglen; 937 size_t ceclen; 938 sctp_parm_hdr_t *cph; 939 sctp_data_hdr_t *sdc; 940 sctp_tf_t *tf; 941 int pad = 0; 942 int hdrlen; 943 mblk_t *errmp = NULL; 944 uint_t sctp_options; 945 int error; 946 uint16_t old_num_str; 947 sctp_stack_t *sctps = sctp->sctp_sctps; 948 949 iack = (sctp_init_chunk_t *)(iackch + 1); 950 951 cph = NULL; 952 if (validate_init_params(sctp, iackch, iack, iackmp, &cph, &errmp, 953 &pad, &sctp_options, ira) == 0) { /* result in 'pad' ignored */ 954 SCTPS_BUMP_MIB(sctps, sctpAborted); 955 sctp_assoc_event(sctp, SCTP_CANT_STR_ASSOC, 0, NULL); 956 sctp_clean_death(sctp, ECONNABORTED); 957 return; 958 } 959 ASSERT(cph != NULL); 960 961 ASSERT(sctp->sctp_cookie_mp == NULL); 962 963 /* Got a cookie to echo back; allocate an mblk */ 964 ceclen = sizeof (*cech) + ntohs(cph->sph_len) - sizeof (*cph); 965 if ((pad = ceclen & (SCTP_ALIGN - 1)) != 0) 966 pad = SCTP_ALIGN - pad; 967 968 if (IPH_HDR_VERSION(iackmp->b_rptr) == IPV4_VERSION) 969 hdrlen = sctp->sctp_hdr_len; 970 else 971 hdrlen = sctp->sctp_hdr6_len; 972 973 cemp = allocb(sctps->sctps_wroff_xtra + hdrlen + ceclen + pad, 974 BPRI_MED); 975 if (cemp == NULL) { 976 SCTP_FADDR_TIMER_RESTART(sctp, sctp->sctp_current, 977 sctp->sctp_current->sf_rto); 978 if (errmp != NULL) 979 freeb(errmp); 980 return; 981 } 982 cemp->b_rptr += (sctps->sctps_wroff_xtra + hdrlen); 983 984 /* Process the INIT ACK */ 985 sctp->sctp_sctph->sh_verf = iack->sic_inittag; 986 sctp->sctp_sctph6->sh_verf = iack->sic_inittag; 987 sctp->sctp_fvtag = iack->sic_inittag; 988 sctp->sctp_ftsn = ntohl(iack->sic_inittsn); 989 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 990 sctp->sctp_fcsn = sctp->sctp_lastacked; 991 sctp->sctp_frwnd = ntohl(iack->sic_a_rwnd); 992 993 /* 994 * Populate sctp with addresses given in the INIT ACK or IP header. 995 * Need to set the df bit in the current fp as it has been cleared 996 * in sctp_connect(). 997 */ 998 sctp->sctp_current->sf_df = B_TRUE; 999 sctp->sctp_ipha->ipha_fragment_offset_and_flags |= IPH_DF_HTONS; 1000 1001 /* 1002 * Since IP uses this info during the fanout process, we need to hold 1003 * the lock for this hash line while performing this operation. 1004 */ 1005 /* XXX sctp_conn_fanout + SCTP_CONN_HASH(sctps, connp->conn_ports); */ 1006 ASSERT(sctp->sctp_conn_tfp != NULL); 1007 tf = sctp->sctp_conn_tfp; 1008 /* sctp isn't a listener so only need to hold conn fanout lock */ 1009 mutex_enter(&tf->tf_lock); 1010 if (sctp_get_addrparams(sctp, NULL, iackmp, iackch, NULL) != 0) { 1011 mutex_exit(&tf->tf_lock); 1012 freeb(cemp); 1013 SCTP_FADDR_TIMER_RESTART(sctp, sctp->sctp_current, 1014 sctp->sctp_current->sf_rto); 1015 if (errmp != NULL) 1016 freeb(errmp); 1017 return; 1018 } 1019 mutex_exit(&tf->tf_lock); 1020 1021 fp = sctp->sctp_current; 1022 1023 /* 1024 * There could be a case when we get an INIT-ACK again, if the INIT 1025 * is re-transmitted, for e.g., which means we would have already 1026 * allocated this resource earlier (also for sctp_instr). In this 1027 * case we check and re-allocate, if necessary. 1028 */ 1029 old_num_str = sctp->sctp_num_ostr; 1030 if (ntohs(iack->sic_instr) < sctp->sctp_num_ostr) 1031 sctp->sctp_num_ostr = ntohs(iack->sic_instr); 1032 if (sctp->sctp_ostrcntrs == NULL) { 1033 sctp->sctp_ostrcntrs = kmem_zalloc(sizeof (uint16_t) * 1034 sctp->sctp_num_ostr, KM_NOSLEEP); 1035 } else { 1036 ASSERT(old_num_str > 0); 1037 if (old_num_str != sctp->sctp_num_ostr) { 1038 kmem_free(sctp->sctp_ostrcntrs, sizeof (uint16_t) * 1039 old_num_str); 1040 sctp->sctp_ostrcntrs = kmem_zalloc(sizeof (uint16_t) * 1041 sctp->sctp_num_ostr, KM_NOSLEEP); 1042 } 1043 } 1044 if (sctp->sctp_ostrcntrs == NULL) { 1045 freeb(cemp); 1046 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->sf_rto); 1047 if (errmp != NULL) 1048 freeb(errmp); 1049 return; 1050 } 1051 1052 /* 1053 * Allocate the in stream tracking array. Comments for sctp_ostrcntrs 1054 * hold here too. 1055 */ 1056 old_num_str = sctp->sctp_num_istr; 1057 if (ntohs(iack->sic_outstr) < sctp->sctp_num_istr) 1058 sctp->sctp_num_istr = ntohs(iack->sic_outstr); 1059 if (sctp->sctp_instr == NULL) { 1060 sctp->sctp_instr = kmem_zalloc(sizeof (*sctp->sctp_instr) * 1061 sctp->sctp_num_istr, KM_NOSLEEP); 1062 } else { 1063 ASSERT(old_num_str > 0); 1064 if (old_num_str != sctp->sctp_num_istr) { 1065 kmem_free(sctp->sctp_instr, 1066 sizeof (*sctp->sctp_instr) * old_num_str); 1067 sctp->sctp_instr = kmem_zalloc( 1068 sizeof (*sctp->sctp_instr) * sctp->sctp_num_istr, 1069 KM_NOSLEEP); 1070 } 1071 } 1072 if (sctp->sctp_instr == NULL) { 1073 kmem_free(sctp->sctp_ostrcntrs, 1074 sizeof (uint16_t) * sctp->sctp_num_ostr); 1075 freeb(cemp); 1076 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->sf_rto); 1077 if (errmp != NULL) 1078 freeb(errmp); 1079 return; 1080 } 1081 1082 if (!(sctp_options & SCTP_PRSCTP_OPTION) && sctp->sctp_prsctp_aware) 1083 sctp->sctp_prsctp_aware = B_FALSE; 1084 1085 if (sctp_find_al_ind((sctp_parm_hdr_t *)(iack + 1), 1086 ntohs(iackch->sch_len) - (sizeof (*iackch) + sizeof (*iack)), 1087 &sctp->sctp_rx_adaptation_code) == 0) { 1088 sctp->sctp_recv_adaptation = 1; 1089 } 1090 1091 cech = (sctp_chunk_hdr_t *)cemp->b_rptr; 1092 ASSERT(OK_32PTR(cech)); 1093 cech->sch_id = CHUNK_COOKIE; 1094 cech->sch_flags = 0; 1095 cech->sch_len = htons(ceclen); 1096 1097 /* Copy the cookie (less the parm hdr) to the chunk */ 1098 bcopy(cph + 1, cech + 1, ceclen - sizeof (*cph)); 1099 1100 cemp->b_wptr = cemp->b_rptr + ceclen; 1101 1102 if (sctp->sctp_unsent > 0) { 1103 sctp_msg_hdr_t *smh; 1104 mblk_t *prev = NULL; 1105 uint32_t unsent = 0; 1106 1107 mp = sctp->sctp_xmit_unsent; 1108 do { 1109 smh = (sctp_msg_hdr_t *)mp->b_rptr; 1110 if (smh->smh_sid >= sctp->sctp_num_ostr) { 1111 unsent += smh->smh_msglen; 1112 if (prev != NULL) 1113 prev->b_next = mp->b_next; 1114 else 1115 sctp->sctp_xmit_unsent = mp->b_next; 1116 mp->b_next = NULL; 1117 sctp_sendfail_event(sctp, mp, SCTP_ERR_BAD_SID, 1118 B_FALSE); 1119 if (prev != NULL) 1120 mp = prev->b_next; 1121 else 1122 mp = sctp->sctp_xmit_unsent; 1123 } else { 1124 prev = mp; 1125 mp = mp->b_next; 1126 } 1127 } while (mp != NULL); 1128 if (unsent > 0) { 1129 ASSERT(sctp->sctp_unsent >= unsent); 1130 sctp->sctp_unsent -= unsent; 1131 /* 1132 * Update ULP the amount of queued data, which is 1133 * sent-unack'ed + unsent. 1134 * This is not necessary, but doesn't harm, we 1135 * just use unsent instead of sent-unack'ed + 1136 * unsent, since there won't be any sent-unack'ed 1137 * here. 1138 */ 1139 if (!SCTP_IS_DETACHED(sctp)) 1140 SCTP_TXQ_UPDATE(sctp); 1141 } 1142 if (sctp->sctp_xmit_unsent == NULL) 1143 sctp->sctp_xmit_unsent_tail = NULL; 1144 } 1145 ceclen += pad; 1146 cansend = MIN(sctp->sctp_unsent, sctp->sctp_frwnd); 1147 meta = sctp_get_msg_to_send(sctp, &mp, NULL, &error, ceclen, 1148 cansend, NULL); 1149 /* 1150 * The error cannot be anything else since we could have an non-zero 1151 * error only if sctp_get_msg_to_send() tries to send a Forward 1152 * TSN which will not happen here. 1153 */ 1154 ASSERT(error == 0); 1155 if (meta == NULL) 1156 goto sendcookie; 1157 sctp->sctp_xmit_tail = meta; 1158 sdc = (sctp_data_hdr_t *)mp->b_rptr; 1159 seglen = ntohs(sdc->sdh_len); 1160 if ((ceclen + seglen) > fp->sf_pmss || 1161 (seglen - sizeof (*sdc)) > cansend) { 1162 goto sendcookie; 1163 } 1164 /* OK, if this fails */ 1165 cemp->b_cont = dupmsg(mp); 1166 sendcookie: 1167 head = sctp_add_proto_hdr(sctp, fp, cemp, 0, NULL); 1168 if (head == NULL) { 1169 freemsg(cemp); 1170 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->sf_rto); 1171 if (errmp != NULL) 1172 freeb(errmp); 1173 SCTP_KSTAT(sctps, sctp_send_cookie_failed); 1174 return; 1175 } 1176 /* 1177 * Even if cookie-echo exceeds MTU for one of the hops, it'll 1178 * have a chance of getting there. 1179 */ 1180 if (fp->sf_isv4) { 1181 ipha_t *iph = (ipha_t *)head->b_rptr; 1182 iph->ipha_fragment_offset_and_flags = 0; 1183 } 1184 BUMP_LOCAL(sctp->sctp_obchunks); 1185 1186 sctp->sctp_cookie_mp = dupmsg(head); 1187 /* Don't bundle, we will just resend init if this cookie is lost. */ 1188 if (sctp->sctp_cookie_mp == NULL) { 1189 if (cemp->b_cont != NULL) { 1190 freemsg(cemp->b_cont); 1191 cemp->b_cont = NULL; 1192 } 1193 } else if (cemp->b_cont != NULL) { 1194 ASSERT(mp != NULL && mp == meta->b_cont); 1195 SCTP_CHUNK_CLEAR_FLAGS(cemp->b_cont); 1196 cemp->b_wptr += pad; 1197 seglen -= sizeof (*sdc); 1198 SCTP_CHUNK_SENT(sctp, mp, sdc, fp, seglen, meta); 1199 } 1200 if (errmp != NULL) { 1201 if (cemp->b_cont == NULL) 1202 cemp->b_wptr += pad; 1203 linkb(head, errmp); 1204 } 1205 sctp->sctp_state = SCTPS_COOKIE_ECHOED; 1206 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->sf_rto); 1207 1208 sctp_set_iplen(sctp, head, fp->sf_ixa); 1209 (void) conn_ip_output(head, fp->sf_ixa); 1210 BUMP_LOCAL(sctp->sctp_opkts); 1211 } 1212 1213 int 1214 sctp_process_cookie(sctp_t *sctp, sctp_chunk_hdr_t *ch, mblk_t *cmp, 1215 sctp_init_chunk_t **iackpp, sctp_hdr_t *insctph, int *recv_adaptation, 1216 in6_addr_t *peer_addr, ip_recv_attr_t *ira) 1217 { 1218 int32_t clen; 1219 size_t initplen; 1220 uchar_t *p; 1221 uchar_t *given_hash; 1222 uchar_t needed_hash[16]; 1223 int64_t ts; 1224 int64_t diff; 1225 uint32_t *lt; 1226 sctp_init_chunk_t *iack; 1227 sctp_chunk_hdr_t *initch; 1228 sctp_init_chunk_t *init; 1229 uint32_t *lttag; 1230 uint32_t *fttag; 1231 uint32_t ports; 1232 sctp_stack_t *sctps = sctp->sctp_sctps; 1233 conn_t *connp = sctp->sctp_connp; 1234 1235 BUMP_LOCAL(sctp->sctp_ibchunks); 1236 /* Verify the ICV */ 1237 clen = ntohs(ch->sch_len) - sizeof (*ch) - 16; 1238 if (clen < 0) { 1239 dprint(1, ("invalid cookie chunk length %d\n", 1240 ntohs(ch->sch_len))); 1241 1242 return (-1); 1243 } 1244 p = (uchar_t *)(ch + 1); 1245 1246 hmac_md5(p, clen, (uchar_t *)sctp->sctp_secret, SCTP_SECRET_LEN, 1247 needed_hash); 1248 1249 /* The given hash follows the cookie data */ 1250 given_hash = p + clen; 1251 1252 if (bcmp(given_hash, needed_hash, 16) != 0) { 1253 /* The secret may have changed; try the old secret */ 1254 hmac_md5(p, clen, (uchar_t *)sctp->sctp_old_secret, 1255 SCTP_SECRET_LEN, needed_hash); 1256 if (bcmp(given_hash, needed_hash, 16) != 0) { 1257 return (-1); 1258 } 1259 } 1260 1261 /* Timestamp is int64_t, and we only guarantee 32-bit alignment */ 1262 bcopy(p, &ts, sizeof (ts)); 1263 /* Cookie life time, uint32_t */ 1264 lt = (uint32_t *)(p + sizeof (ts)); 1265 1266 /* 1267 * To quote PRC, "this is our baby", so let's continue. 1268 * We need to pull out the encapsulated INIT ACK and 1269 * INIT chunks. Note that we don't process these until 1270 * we have verified the timestamp, but we need them before 1271 * processing the timestamp since if the time check fails, 1272 * we need to get the verification tag from the INIT in order 1273 * to send a stale cookie error. 1274 */ 1275 lttag = (uint32_t *)(lt + 1); 1276 fttag = lttag + 1; 1277 if (peer_addr != NULL) 1278 bcopy(fttag + 1, peer_addr, sizeof (in6_addr_t)); 1279 iack = (sctp_init_chunk_t *)((char *)(fttag + 1) + sizeof (in6_addr_t)); 1280 initch = (sctp_chunk_hdr_t *)(iack + 1); 1281 init = (sctp_init_chunk_t *)(initch + 1); 1282 initplen = ntohs(initch->sch_len) - (sizeof (*init) + sizeof (*initch)); 1283 *iackpp = iack; 1284 *recv_adaptation = 0; 1285 1286 /* 1287 * Check the staleness of the Cookie, specified in 3.3.10.3 of 1288 * RFC 2960. 1289 * 1290 * The mesaure of staleness is the difference, in microseconds, 1291 * between the current time and the time the State Cookie expires. 1292 * So it is lbolt64 - (ts + *lt). If it is positive, it means 1293 * that the Cookie has expired. 1294 */ 1295 diff = LBOLT_FASTPATH64 - (ts + *lt); 1296 if (diff > 0 && (init->sic_inittag != sctp->sctp_fvtag || 1297 iack->sic_inittag != sctp->sctp_lvtag)) { 1298 uint32_t staleness; 1299 1300 staleness = TICK_TO_USEC(diff); 1301 staleness = htonl(staleness); 1302 sctp_send_abort(sctp, init->sic_inittag, SCTP_ERR_STALE_COOKIE, 1303 (char *)&staleness, sizeof (staleness), cmp, 1, B_FALSE, 1304 ira); 1305 1306 dprint(1, ("stale cookie %d\n", staleness)); 1307 1308 return (-1); 1309 } 1310 1311 /* Check for attack by adding addresses to a restart */ 1312 bcopy(insctph, &ports, sizeof (ports)); 1313 if (sctp_secure_restart_check(cmp, initch, ports, KM_NOSLEEP, 1314 sctps, ira) != 1) { 1315 return (-1); 1316 } 1317 1318 /* Look for adaptation code if there any parms in the INIT chunk */ 1319 if ((initplen >= sizeof (sctp_parm_hdr_t)) && 1320 (sctp_find_al_ind((sctp_parm_hdr_t *)(init + 1), initplen, 1321 &sctp->sctp_rx_adaptation_code) == 0)) { 1322 *recv_adaptation = 1; 1323 } 1324 1325 /* Examine tie-tags */ 1326 1327 if (sctp->sctp_state >= SCTPS_COOKIE_WAIT) { 1328 if (sctp->sctp_state == SCTPS_ESTABLISHED && 1329 init->sic_inittag == sctp->sctp_fvtag && 1330 iack->sic_inittag == sctp->sctp_lvtag && 1331 *fttag == 0 && *lttag == 0) { 1332 1333 dprint(1, ("duplicate cookie from %x:%x:%x:%x (%d)\n", 1334 SCTP_PRINTADDR(sctp->sctp_current->sf_faddr), 1335 (int)(connp->conn_fport))); 1336 return (-1); 1337 } 1338 1339 if (init->sic_inittag != sctp->sctp_fvtag && 1340 iack->sic_inittag != sctp->sctp_lvtag && 1341 *fttag == sctp->sctp_fvtag && 1342 *lttag == sctp->sctp_lvtag) { 1343 int i; 1344 1345 /* Section 5.2.4 case A: restart */ 1346 sctp->sctp_fvtag = init->sic_inittag; 1347 sctp->sctp_lvtag = iack->sic_inittag; 1348 1349 sctp->sctp_sctph->sh_verf = init->sic_inittag; 1350 sctp->sctp_sctph6->sh_verf = init->sic_inittag; 1351 1352 sctp->sctp_ftsn = ntohl(init->sic_inittsn); 1353 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 1354 sctp->sctp_frwnd = ntohl(init->sic_a_rwnd); 1355 sctp->sctp_fcsn = sctp->sctp_lastacked; 1356 1357 if (sctp->sctp_state < SCTPS_ESTABLISHED) 1358 SCTP_ASSOC_EST(sctps, sctp); 1359 1360 dprint(1, ("sctp peer %x:%x:%x:%x (%d) restarted\n", 1361 SCTP_PRINTADDR(sctp->sctp_current->sf_faddr), 1362 (int)(connp->conn_fport))); 1363 /* reset parameters */ 1364 sctp_congest_reset(sctp); 1365 1366 /* reset stream bookkeeping */ 1367 sctp_instream_cleanup(sctp, B_FALSE); 1368 1369 sctp->sctp_istr_nmsgs = 0; 1370 sctp->sctp_rxqueued = 0; 1371 for (i = 0; i < sctp->sctp_num_ostr; i++) { 1372 sctp->sctp_ostrcntrs[i] = 0; 1373 } 1374 /* XXX flush xmit_list? */ 1375 1376 return (0); 1377 } else if (init->sic_inittag != sctp->sctp_fvtag && 1378 iack->sic_inittag == sctp->sctp_lvtag) { 1379 1380 /* Section 5.2.4 case B: INIT collision */ 1381 if (sctp->sctp_state < SCTPS_ESTABLISHED) { 1382 if (!sctp_initialize_params(sctp, init, iack)) 1383 return (-1); /* Drop? */ 1384 SCTP_ASSOC_EST(sctps, sctp); 1385 } 1386 1387 dprint(1, ("init collision with %x:%x:%x:%x (%d)\n", 1388 SCTP_PRINTADDR(sctp->sctp_current->sf_faddr), 1389 (int)(connp->conn_fport))); 1390 1391 return (0); 1392 } else if (iack->sic_inittag != sctp->sctp_lvtag && 1393 init->sic_inittag == sctp->sctp_fvtag && 1394 *fttag == 0 && *lttag == 0) { 1395 1396 /* Section 5.2.4 case C: late COOKIE */ 1397 dprint(1, ("late cookie from %x:%x:%x:%x (%d)\n", 1398 SCTP_PRINTADDR(sctp->sctp_current->sf_faddr), 1399 (int)(connp->conn_fport))); 1400 return (-1); 1401 } else if (init->sic_inittag == sctp->sctp_fvtag && 1402 iack->sic_inittag == sctp->sctp_lvtag) { 1403 1404 /* 1405 * Section 5.2.4 case D: COOKIE ECHO retransmit 1406 * Don't check cookie lifetime 1407 */ 1408 dprint(1, ("cookie tags match from %x:%x:%x:%x (%d)\n", 1409 SCTP_PRINTADDR(sctp->sctp_current->sf_faddr), 1410 (int)(connp->conn_fport))); 1411 if (sctp->sctp_state < SCTPS_ESTABLISHED) { 1412 if (!sctp_initialize_params(sctp, init, iack)) 1413 return (-1); /* Drop? */ 1414 SCTP_ASSOC_EST(sctps, sctp); 1415 } 1416 return (0); 1417 } else { 1418 /* unrecognized case -- silently drop it */ 1419 return (-1); 1420 } 1421 } 1422 1423 return (0); 1424 } 1425 1426 /* 1427 * Similar to ip_fanout_sctp, except that the src addr(s) are drawn 1428 * from address parameters in an INIT ACK's address list. This 1429 * function is used when an INIT ACK is received but IP's fanout 1430 * function could not find a sctp via the normal lookup routine. 1431 * This can happen when a host sends an INIT ACK from a different 1432 * address than the INIT was sent to. 1433 * 1434 * Returns the sctp_t if found, or NULL if not found. 1435 */ 1436 sctp_t * 1437 sctp_addrlist2sctp(mblk_t *mp, sctp_hdr_t *sctph, sctp_chunk_hdr_t *ich, 1438 zoneid_t zoneid, sctp_stack_t *sctps) 1439 { 1440 int isv4; 1441 ipha_t *iph; 1442 ip6_t *ip6h; 1443 in6_addr_t dst; 1444 in6_addr_t src, *srcp = &src; 1445 sctp_parm_hdr_t *ph; 1446 ssize_t remaining; 1447 sctp_init_chunk_t *iack; 1448 uint32_t ports; 1449 sctp_t *sctp = NULL; 1450 1451 ASSERT(ich->sch_id == CHUNK_INIT_ACK); 1452 1453 isv4 = (IPH_HDR_VERSION(mp->b_rptr) == IPV4_VERSION); 1454 if (isv4) { 1455 iph = (ipha_t *)mp->b_rptr; 1456 IN6_IPADDR_TO_V4MAPPED(iph->ipha_dst, &dst); 1457 } else { 1458 ip6h = (ip6_t *)mp->b_rptr; 1459 dst = ip6h->ip6_dst; 1460 } 1461 1462 ports = *(uint32_t *)sctph; 1463 1464 dprint(1, ("sctp_addrlist2sctp: ports=%u, dst = %x:%x:%x:%x\n", 1465 ports, SCTP_PRINTADDR(dst))); 1466 1467 /* pull out any address parameters */ 1468 remaining = ntohs(ich->sch_len) - sizeof (*ich) - sizeof (*iack); 1469 if (remaining < sizeof (*ph)) { 1470 return (NULL); 1471 } 1472 1473 iack = (sctp_init_chunk_t *)(ich + 1); 1474 ph = (sctp_parm_hdr_t *)(iack + 1); 1475 1476 while (ph != NULL) { 1477 /* 1478 * params have been verified in sctp_check_input(), 1479 * so no need to do it again here. 1480 * 1481 * For labeled systems, there's no need to check the 1482 * label here. It's known to be good as we checked 1483 * before allowing the connection to become bound. 1484 * 1485 * According to RFC4960 : 1486 * All integer fields in an SCTP packet MUST be transmitted 1487 * in network byte order, unless otherwise stated. 1488 * Therefore convert the param type to network byte order. 1489 */ 1490 if (ph->sph_type == htons(PARM_ADDR4)) { 1491 IN6_INADDR_TO_V4MAPPED((struct in_addr *)(ph + 1), 1492 srcp); 1493 1494 sctp = sctp_conn_match(&srcp, 1, &dst, ports, zoneid, 1495 0, sctps); 1496 1497 dprint(1, 1498 ("sctp_addrlist2sctp: src=%x:%x:%x:%x, sctp=%p\n", 1499 SCTP_PRINTADDR(src), (void *)sctp)); 1500 1501 1502 if (sctp != NULL) { 1503 return (sctp); 1504 } 1505 } else if (ph->sph_type == htons(PARM_ADDR6)) { 1506 srcp = (in6_addr_t *)(ph + 1); 1507 sctp = sctp_conn_match(&srcp, 1, &dst, ports, zoneid, 1508 0, sctps); 1509 1510 dprint(1, 1511 ("sctp_addrlist2sctp: src=%x:%x:%x:%x, sctp=%p\n", 1512 SCTP_PRINTADDR(src), (void *)sctp)); 1513 1514 if (sctp != NULL) { 1515 return (sctp); 1516 } 1517 } 1518 1519 ph = sctp_next_parm(ph, &remaining); 1520 } 1521 1522 return (NULL); 1523 } 1524