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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <sys/systm.h> 31 #include <sys/stream.h> 32 #include <sys/cmn_err.h> 33 #include <sys/md5.h> 34 #include <sys/kmem.h> 35 #include <sys/strsubr.h> 36 #include <sys/random.h> 37 38 #include <netinet/in.h> 39 #include <netinet/ip6.h> 40 41 #include <inet/common.h> 42 #include <inet/ip.h> 43 #include <inet/ip6.h> 44 #include <inet/sctp_ip.h> 45 #include <inet/ipclassifier.h> 46 #include "sctp_impl.h" 47 48 /* 49 * Helper function for SunCluster (PSARC/2005/602) to get the original source 50 * address from the COOKIE 51 */ 52 int cl_sctp_cookie_paddr(sctp_chunk_hdr_t *, in6_addr_t *); 53 54 /* 55 * From RFC 2104. This should probably go into libmd5 (and while 56 * we're at it, maybe we should make a libdigest so we can later 57 * add SHA1 and others, esp. since some weaknesses have been found 58 * with MD5). 59 * 60 * text IN pointer to data stream 61 * text_len IN length of data stream 62 * key IN pointer to authentication key 63 * key_len IN length of authentication key 64 * digest OUT caller digest to be filled in 65 */ 66 static void 67 hmac_md5(uchar_t *text, size_t text_len, uchar_t *key, size_t key_len, 68 uchar_t *digest) 69 { 70 MD5_CTX context; 71 uchar_t k_ipad[65]; /* inner padding - key XORd with ipad */ 72 uchar_t k_opad[65]; /* outer padding - key XORd with opad */ 73 uchar_t tk[16]; 74 int i; 75 76 /* if key is longer than 64 bytes reset it to key=MD5(key) */ 77 if (key_len > 64) { 78 MD5_CTX tctx; 79 80 MD5Init(&tctx); 81 MD5Update(&tctx, key, key_len); 82 MD5Final(tk, &tctx); 83 84 key = tk; 85 key_len = 16; 86 } 87 88 /* 89 * the HMAC_MD5 transform looks like: 90 * 91 * MD5(K XOR opad, MD5(K XOR ipad, text)) 92 * 93 * where K is an n byte key 94 * ipad is the byte 0x36 repeated 64 times 95 * opad is the byte 0x5c repeated 64 times 96 * and text is the data being protected 97 */ 98 99 /* start out by storing key in pads */ 100 bzero(k_ipad, sizeof (k_ipad)); 101 bzero(k_opad, sizeof (k_opad)); 102 bcopy(key, k_ipad, key_len); 103 bcopy(key, k_opad, key_len); 104 105 /* XOR key with ipad and opad values */ 106 for (i = 0; i < 64; i++) { 107 k_ipad[i] ^= 0x36; 108 k_opad[i] ^= 0x5c; 109 } 110 /* 111 * perform inner MD5 112 */ 113 MD5Init(&context); /* init context for 1st */ 114 /* pass */ 115 MD5Update(&context, k_ipad, 64); /* start with inner pad */ 116 MD5Update(&context, text, text_len); /* then text of datagram */ 117 MD5Final(digest, &context); /* finish up 1st pass */ 118 /* 119 * perform outer MD5 120 */ 121 MD5Init(&context); /* init context for 2nd */ 122 /* pass */ 123 MD5Update(&context, k_opad, 64); /* start with outer pad */ 124 MD5Update(&context, digest, 16); /* then results of 1st */ 125 /* hash */ 126 MD5Final(digest, &context); /* finish up 2nd pass */ 127 } 128 129 /* 130 * If inmp is non-NULL, and we need to abort, it will use the IP/SCTP 131 * info in initmp to send the abort. Otherwise, no abort will be sent. 132 * If errmp is non-NULL, a chain of unrecognized parameters will 133 * be created and returned via *errmp. 134 * 135 * Returns 1 if the parameters are OK (or there are no parameters), or 136 * 0 if not. 137 */ 138 static int 139 validate_init_params(sctp_t *sctp, sctp_chunk_hdr_t *ch, 140 sctp_init_chunk_t *init, mblk_t *inmp, sctp_parm_hdr_t **want_cookie, 141 mblk_t **errmp, int *supp_af, uint_t *sctp_options) 142 { 143 sctp_parm_hdr_t *cph; 144 sctp_init_chunk_t *ic; 145 ssize_t remaining; 146 uint16_t serror = 0; 147 char *details = NULL; 148 size_t errlen = 0; 149 boolean_t got_cookie = B_FALSE; 150 uint16_t ptype; 151 152 if (sctp_options != NULL) 153 *sctp_options = 0; 154 155 /* First validate stream parameters */ 156 if (init->sic_instr == 0 || init->sic_outstr == 0) { 157 serror = SCTP_ERR_BAD_MANDPARM; 158 dprint(1, 159 ("validate_init_params: bad sid, is=%d os=%d\n", 160 htons(init->sic_instr), htons(init->sic_outstr))); 161 goto abort; 162 } 163 if (ntohl(init->sic_inittag) == 0) { 164 serror = SCTP_ERR_BAD_MANDPARM; 165 dprint(1, ("validate_init_params: inittag = 0\n")); 166 goto abort; 167 } 168 169 remaining = ntohs(ch->sch_len) - sizeof (*ch); 170 ic = (sctp_init_chunk_t *)(ch + 1); 171 remaining -= sizeof (*ic); 172 if (remaining < sizeof (*cph)) { 173 /* Nothing to validate */ 174 if (want_cookie != NULL) 175 goto cookie_abort; 176 return (1); 177 } 178 179 cph = (sctp_parm_hdr_t *)(ic + 1); 180 181 while (cph != NULL) { 182 ptype = ntohs(cph->sph_type); 183 switch (ptype) { 184 case PARM_HBINFO: 185 case PARM_UNRECOGNIZED: 186 case PARM_ECN: 187 /* just ignore them */ 188 break; 189 case PARM_FORWARD_TSN: 190 if (sctp_options != NULL) 191 *sctp_options |= SCTP_PRSCTP_OPTION; 192 break; 193 case PARM_COOKIE: 194 got_cookie = B_TRUE; 195 if (want_cookie != NULL) { 196 *want_cookie = cph; 197 } 198 break; 199 case PARM_ADDR4: 200 *supp_af |= PARM_SUPP_V4; 201 break; 202 case PARM_ADDR6: 203 *supp_af |= PARM_SUPP_V6; 204 break; 205 case PARM_COOKIE_PRESERVE: 206 case PARM_ADAPT_LAYER_IND: 207 /* These are OK */ 208 break; 209 case PARM_ADDR_HOST_NAME: 210 /* Don't support this; abort the association */ 211 serror = SCTP_ERR_BAD_ADDR; 212 details = (char *)cph; 213 errlen = ntohs(cph->sph_len); 214 dprint(1, ("sctp:validate_init_params: host addr\n")); 215 goto abort; 216 case PARM_SUPP_ADDRS: { 217 /* Make sure we have a supported addr intersection */ 218 uint16_t *p, addrtype; 219 int plen; 220 221 plen = ntohs(cph->sph_len); 222 p = (uint16_t *)(cph + 1); 223 while (plen > 0) { 224 addrtype = ntohs(*p); 225 switch (addrtype) { 226 case PARM_ADDR6: 227 *supp_af |= PARM_SUPP_V6; 228 break; 229 case PARM_ADDR4: 230 *supp_af |= PARM_SUPP_V4; 231 break; 232 default: 233 /* 234 * Do nothing, silently ignore hostname 235 * address. 236 */ 237 break; 238 } 239 p++; 240 plen -= sizeof (*p); 241 } 242 break; 243 } 244 default: 245 /* Unrecognized param; check the high order bits */ 246 if ((ptype & 0xc000) == 0xc000) { 247 /* 248 * report unrecognized param, and 249 * keep processing 250 */ 251 if (errmp != NULL) { 252 if (want_cookie != NULL) { 253 *errmp = sctp_make_err(sctp, 254 PARM_UNRECOGNIZED, 255 (void *)cph, 256 ntohs(cph->sph_len)); 257 } else { 258 sctp_add_unrec_parm(cph, errmp); 259 } 260 } 261 break; 262 } 263 if (ptype & 0x4000) { 264 /* 265 * Stop processing and drop; report 266 * unrecognized param 267 */ 268 serror = SCTP_ERR_UNREC_PARM; 269 details = (char *)cph; 270 errlen = ntohs(cph->sph_len); 271 goto abort; 272 } 273 if (ptype & 0x8000) { 274 /* skip and continue processing */ 275 break; 276 } 277 278 /* 279 * 2 high bits are clear; stop processing and 280 * drop packet 281 */ 282 return (0); 283 } 284 285 cph = sctp_next_parm(cph, &remaining); 286 } 287 /* 288 * Some sanity checks. The following should not fail unless the 289 * other side is broken. 290 * 291 * 1. If this is a V4 endpoint but V4 address is not 292 * supported, abort. 293 * 2. If this is a V6 only endpoint but V6 address is 294 * not supported, abort. This assumes that a V6 295 * endpoint can use both V4 and V6 addresses. 296 * We only care about supp_af when processing INIT, i.e want_cookie 297 * is NULL. 298 */ 299 if (want_cookie == NULL && 300 ((sctp->sctp_family == AF_INET && !(*supp_af & PARM_SUPP_V4)) || 301 (sctp->sctp_family == AF_INET6 && !(*supp_af & PARM_SUPP_V6) && 302 sctp->sctp_connp->conn_ipv6_v6only))) { 303 dprint(1, ("sctp:validate_init_params: supp addr\n")); 304 serror = SCTP_ERR_BAD_ADDR; 305 goto abort; 306 } 307 308 if (want_cookie != NULL && !got_cookie) { 309 cookie_abort: 310 dprint(1, ("validate_init_params: cookie absent\n")); 311 sctp_send_abort(sctp, sctp_init2vtag(ch), SCTP_ERR_MISSING_PARM, 312 details, errlen, inmp, 0, B_FALSE); 313 return (0); 314 } 315 316 /* OK */ 317 return (1); 318 319 abort: 320 if (want_cookie != NULL) 321 return (0); 322 323 sctp_send_abort(sctp, sctp_init2vtag(ch), serror, details, 324 errlen, inmp, 0, B_FALSE); 325 return (0); 326 } 327 328 /* 329 * Initialize params from the INIT and INIT-ACK when the assoc. is 330 * established. 331 */ 332 boolean_t 333 sctp_initialize_params(sctp_t *sctp, sctp_init_chunk_t *init, 334 sctp_init_chunk_t *iack) 335 { 336 /* Get initial TSN */ 337 sctp->sctp_ftsn = ntohl(init->sic_inittsn); 338 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 339 340 /* Serial number is initialized to the same value as the TSN */ 341 sctp->sctp_fcsn = sctp->sctp_lastacked; 342 343 /* 344 * Get verification tags; no byteordering is necessary, since 345 * verfication tags are never processed except for byte-by-byte 346 * comparisons. 347 */ 348 sctp->sctp_fvtag = init->sic_inittag; 349 sctp->sctp_sctph->sh_verf = init->sic_inittag; 350 sctp->sctp_sctph6->sh_verf = init->sic_inittag; 351 sctp->sctp_lvtag = iack->sic_inittag; 352 353 /* Get the peer's rwnd */ 354 sctp->sctp_frwnd = ntohl(init->sic_a_rwnd); 355 356 /* Allocate the in/out-stream counters */ 357 sctp->sctp_num_ostr = iack->sic_outstr; 358 sctp->sctp_ostrcntrs = kmem_zalloc(sizeof (uint16_t) * 359 sctp->sctp_num_ostr, KM_NOSLEEP); 360 if (sctp->sctp_ostrcntrs == NULL) 361 return (B_FALSE); 362 363 sctp->sctp_num_istr = iack->sic_instr; 364 sctp->sctp_instr = kmem_zalloc(sizeof (*sctp->sctp_instr) * 365 sctp->sctp_num_istr, KM_NOSLEEP); 366 if (sctp->sctp_instr == NULL) { 367 kmem_free(sctp->sctp_ostrcntrs, sizeof (uint16_t) * 368 sctp->sctp_num_ostr); 369 sctp->sctp_ostrcntrs = NULL; 370 return (B_FALSE); 371 } 372 return (B_TRUE); 373 } 374 375 /* 376 * Copy the peer's original source address into addr. This relies on the 377 * following format (see sctp_send_initack() below): 378 * relative timestamp for the cookie (int64_t) + 379 * cookie lifetime (uint32_t) + 380 * local tie-tag (uint32_t) + peer tie-tag (uint32_t) + 381 * Peer's original src ... 382 */ 383 int 384 cl_sctp_cookie_paddr(sctp_chunk_hdr_t *ch, in6_addr_t *addr) 385 { 386 uchar_t *off; 387 388 ASSERT(addr != NULL); 389 390 if (ch->sch_id != CHUNK_COOKIE) 391 return (EINVAL); 392 393 off = (uchar_t *)ch + sizeof (*ch) + sizeof (int64_t) + 394 sizeof (uint32_t) + sizeof (uint32_t) + sizeof (uint32_t); 395 396 bcopy(off, addr, sizeof (*addr)); 397 398 return (0); 399 } 400 401 #define SCTP_CALC_COOKIE_LEN(initcp) \ 402 sizeof (int64_t) + /* timestamp */ \ 403 sizeof (uint32_t) + /* cookie lifetime */ \ 404 sizeof (sctp_init_chunk_t) + /* INIT ACK */ \ 405 sizeof (in6_addr_t) + /* peer's original source */ \ 406 ntohs((initcp)->sch_len) + /* peer's INIT */ \ 407 sizeof (uint32_t) + /* local tie-tag */ \ 408 sizeof (uint32_t) + /* peer tie-tag */ \ 409 sizeof (sctp_parm_hdr_t) + /* param header */ \ 410 16 /* MD5 hash */ 411 412 void 413 sctp_send_initack(sctp_t *sctp, sctp_chunk_hdr_t *ch, mblk_t *initmp) 414 { 415 ipha_t *initiph; 416 ip6_t *initip6h; 417 ipha_t *iackiph; 418 ip6_t *iackip6h; 419 sctp_chunk_hdr_t *iack_ch; 420 sctp_init_chunk_t *iack; 421 sctp_init_chunk_t *init; 422 sctp_hdr_t *iacksh; 423 sctp_hdr_t *initsh; 424 size_t cookielen; 425 size_t iacklen; 426 size_t ipsctplen; 427 size_t errlen = 0; 428 sctp_parm_hdr_t *cookieph; 429 mblk_t *iackmp; 430 uint32_t itag; 431 uint32_t itsn; 432 int64_t *now; 433 int64_t nowt; 434 uint32_t *lifetime; 435 char *p; 436 boolean_t isv4; 437 int supp_af = 0; 438 uint_t sctp_options; 439 uint32_t *ttag; 440 int pad; 441 mblk_t *errmp = NULL; 442 boolean_t initcollision = B_FALSE; 443 boolean_t linklocal = B_FALSE; 444 445 BUMP_LOCAL(sctp->sctp_ibchunks); 446 isv4 = (IPH_HDR_VERSION(initmp->b_rptr) == IPV4_VERSION); 447 448 /* Extract the INIT chunk */ 449 if (isv4) { 450 initiph = (ipha_t *)initmp->b_rptr; 451 initsh = (sctp_hdr_t *)((char *)initiph + 452 IPH_HDR_LENGTH(initmp->b_rptr)); 453 ipsctplen = sctp->sctp_ip_hdr_len; 454 supp_af |= PARM_SUPP_V4; 455 } else { 456 initip6h = (ip6_t *)initmp->b_rptr; 457 initsh = (sctp_hdr_t *)(initip6h + 1); 458 ipsctplen = sctp->sctp_ip_hdr6_len; 459 if (IN6_IS_ADDR_LINKLOCAL(&initip6h->ip6_src)) 460 linklocal = B_TRUE; 461 supp_af |= PARM_SUPP_V6; 462 } 463 ASSERT(OK_32PTR(initsh)); 464 init = (sctp_init_chunk_t *)((char *)(initsh + 1) + sizeof (*iack_ch)); 465 466 /* Make sure we like the peer's parameters */ 467 if (validate_init_params(sctp, ch, init, initmp, NULL, &errmp, 468 &supp_af, &sctp_options) == 0) { 469 return; 470 } 471 if (errmp != NULL) 472 errlen = msgdsize(errmp); 473 if (sctp->sctp_family == AF_INET) { 474 /* 475 * Irregardless of the supported address in the INIT, v4 476 * must be supported. 477 */ 478 supp_af = PARM_SUPP_V4; 479 } 480 if (sctp->sctp_state <= SCTPS_LISTEN) { 481 /* normal, expected INIT: generate new vtag and itsn */ 482 (void) random_get_pseudo_bytes((uint8_t *)&itag, sizeof (itag)); 483 if (itag == 0) 484 itag = (uint32_t)gethrtime(); 485 itsn = itag + 1; 486 itag = htonl(itag); 487 } else if (sctp->sctp_state == SCTPS_COOKIE_WAIT || 488 sctp->sctp_state == SCTPS_COOKIE_ECHOED) { 489 /* init collision; copy vtag and itsn from sctp */ 490 itag = sctp->sctp_lvtag; 491 itsn = sctp->sctp_ltsn; 492 /* 493 * In addition we need to send all the params that was sent 494 * in our INIT chunk. Essentially, it is only the supported 495 * address params that we need to add. 496 */ 497 initcollision = B_TRUE; 498 /* 499 * When we sent the INIT, we should have set linklocal in 500 * the sctp which should be good enough. 501 */ 502 if (linklocal) 503 linklocal = B_FALSE; 504 } else { 505 /* peer restart; generate new vtag but keep everything else */ 506 (void) random_get_pseudo_bytes((uint8_t *)&itag, sizeof (itag)); 507 if (itag == 0) 508 itag = (uint32_t)gethrtime(); 509 itag = htonl(itag); 510 itsn = sctp->sctp_ltsn; 511 } 512 513 /* 514 * Allocate a mblk for the INIT ACK, consisting of the link layer 515 * header, the IP header, the SCTP common header, and INIT ACK chunk, 516 * and finally the COOKIE parameter. 517 */ 518 cookielen = SCTP_CALC_COOKIE_LEN(ch); 519 iacklen = sizeof (*iack_ch) + sizeof (*iack) + cookielen; 520 if (sctp->sctp_send_adaption) 521 iacklen += (sizeof (sctp_parm_hdr_t) + sizeof (uint32_t)); 522 if (((sctp_options & SCTP_PRSCTP_OPTION) || initcollision) && 523 sctp->sctp_prsctp_aware && sctp_prsctp_enabled) { 524 iacklen += sctp_options_param_len(sctp, SCTP_PRSCTP_OPTION); 525 } 526 if (initcollision) 527 iacklen += sctp_supaddr_param_len(sctp); 528 if (!linklocal) 529 iacklen += sctp_addr_params_len(sctp, supp_af, B_FALSE); 530 ipsctplen += sizeof (*iacksh) + iacklen; 531 iacklen += errlen; 532 if ((pad = ipsctplen % 4) != 0) { 533 pad = 4 - pad; 534 ipsctplen += pad; 535 } 536 iackmp = allocb(ipsctplen + sctp_wroff_xtra, BPRI_MED); 537 if (iackmp == NULL) { 538 sctp_send_abort(sctp, sctp_init2vtag(ch), 539 SCTP_ERR_NO_RESOURCES, NULL, 0, initmp, 0, B_FALSE); 540 return; 541 } 542 543 /* Copy in the [imcomplete] IP/SCTP composite header */ 544 p = (char *)(iackmp->b_rptr + sctp_wroff_xtra); 545 iackmp->b_rptr = (uchar_t *)p; 546 if (isv4) { 547 bcopy(sctp->sctp_iphc, p, sctp->sctp_hdr_len); 548 iackiph = (ipha_t *)p; 549 550 /* Copy the peer's IP addr */ 551 iackiph->ipha_dst = initiph->ipha_src; 552 iackiph->ipha_src = initiph->ipha_dst; 553 iackiph->ipha_length = htons(ipsctplen + errlen); 554 iacksh = (sctp_hdr_t *)(p + sctp->sctp_ip_hdr_len); 555 } else { 556 bcopy(sctp->sctp_iphc6, p, sctp->sctp_hdr6_len); 557 iackip6h = (ip6_t *)p; 558 559 /* Copy the peer's IP addr */ 560 iackip6h->ip6_dst = initip6h->ip6_src; 561 iackip6h->ip6_src = initip6h->ip6_dst; 562 iackip6h->ip6_plen = htons(ipsctplen - sizeof (*iackip6h) + 563 errlen); 564 iacksh = (sctp_hdr_t *)(p + sctp->sctp_ip_hdr6_len); 565 } 566 ASSERT(OK_32PTR(iacksh)); 567 568 /* Fill in the holes in the SCTP common header */ 569 iacksh->sh_sport = initsh->sh_dport; 570 iacksh->sh_dport = initsh->sh_sport; 571 iacksh->sh_verf = init->sic_inittag; 572 573 /* INIT ACK chunk header */ 574 iack_ch = (sctp_chunk_hdr_t *)(iacksh + 1); 575 iack_ch->sch_id = CHUNK_INIT_ACK; 576 iack_ch->sch_flags = 0; 577 iack_ch->sch_len = htons(iacklen); 578 579 /* The INIT ACK itself */ 580 iack = (sctp_init_chunk_t *)(iack_ch + 1); 581 iack->sic_inittag = itag; /* already in network byteorder */ 582 iack->sic_inittsn = htonl(itsn); 583 584 iack->sic_a_rwnd = htonl(sctp->sctp_rwnd); 585 /* Advertise what we would want to have as stream #'s */ 586 iack->sic_outstr = htons(MIN(sctp->sctp_num_ostr, 587 ntohs(init->sic_instr))); 588 iack->sic_instr = htons(sctp->sctp_num_istr); 589 590 p = (char *)(iack + 1); 591 p += sctp_adaption_code_param(sctp, (uchar_t *)p); 592 if (initcollision) 593 p += sctp_supaddr_param(sctp, (uchar_t *)p); 594 if (!linklocal) 595 p += sctp_addr_params(sctp, supp_af, (uchar_t *)p); 596 if (((sctp_options & SCTP_PRSCTP_OPTION) || initcollision) && 597 sctp->sctp_prsctp_aware && sctp_prsctp_enabled) { 598 p += sctp_options_param(sctp, p, SCTP_PRSCTP_OPTION); 599 } 600 /* 601 * Generate and lay in the COOKIE parameter. 602 * 603 * Any change here that results in a change of location for 604 * the peer's orig source address must be propagated to the fn 605 * cl_sctp_cookie_paddr() above. 606 * 607 * The cookie consists of: 608 * 1. The relative timestamp for the cookie (lbolt64) 609 * 2. The cookie lifetime (uint32_t) in tick 610 * 3. The local tie-tag 611 * 4. The peer tie-tag 612 * 5. Peer's original src, used to confirm the validity of address. 613 * 6. Our INIT ACK chunk, less any parameters 614 * 7. The INIT chunk (may contain parameters) 615 * 8. 128-bit MD5 signature. 616 * 617 * Since the timestamp values will only be evaluated locally, we 618 * don't need to worry about byte-ordering them. 619 */ 620 cookieph = (sctp_parm_hdr_t *)p; 621 cookieph->sph_type = htons(PARM_COOKIE); 622 cookieph->sph_len = htons(cookielen); 623 624 /* timestamp */ 625 now = (int64_t *)(cookieph + 1); 626 nowt = lbolt64; 627 bcopy(&nowt, now, sizeof (*now)); 628 629 /* cookie lifetime -- need configuration */ 630 lifetime = (uint32_t *)(now + 1); 631 *lifetime = sctp->sctp_cookie_lifetime; 632 633 /* Set the tie-tags */ 634 ttag = (uint32_t *)(lifetime + 1); 635 if (sctp->sctp_state <= SCTPS_COOKIE_WAIT) { 636 *ttag = 0; 637 ttag++; 638 *ttag = 0; 639 ttag++; 640 } else { 641 /* local tie-tag (network byte-order) */ 642 *ttag = sctp->sctp_lvtag; 643 ttag++; 644 /* peer tie-tag (network byte-order) */ 645 *ttag = sctp->sctp_fvtag; 646 ttag++; 647 } 648 /* 649 * Copy in peer's original source address so that we can confirm 650 * the reachability later. 651 */ 652 p = (char *)ttag; 653 if (isv4) { 654 in6_addr_t peer_addr; 655 656 IN6_IPADDR_TO_V4MAPPED(iackiph->ipha_dst, &peer_addr); 657 bcopy(&peer_addr, p, sizeof (in6_addr_t)); 658 } else { 659 bcopy(&iackip6h->ip6_dst, p, sizeof (in6_addr_t)); 660 } 661 p += sizeof (in6_addr_t); 662 /* Copy in our INIT ACK chunk */ 663 bcopy(iack, p, sizeof (*iack)); 664 iack = (sctp_init_chunk_t *)p; 665 /* Set the # of streams we'll end up using */ 666 iack->sic_outstr = MIN(sctp->sctp_num_ostr, ntohs(init->sic_instr)); 667 iack->sic_instr = MIN(sctp->sctp_num_istr, ntohs(init->sic_outstr)); 668 p += sizeof (*iack); 669 670 /* Copy in the peer's INIT chunk */ 671 bcopy(ch, p, ntohs(ch->sch_len)); 672 p += ntohs(ch->sch_len); 673 674 /* 675 * Calculate the HMAC ICV into the digest slot in buf. 676 * First, generate a new secret if the current secret is 677 * older than the new secret lifetime parameter permits, 678 * copying the current secret to sctp_old_secret. 679 */ 680 if (sctp_new_secret_interval > 0 && 681 (sctp->sctp_last_secret_update + 682 MSEC_TO_TICK(sctp_new_secret_interval)) <= nowt) { 683 bcopy(sctp->sctp_secret, sctp->sctp_old_secret, 684 SCTP_SECRET_LEN); 685 (void) random_get_pseudo_bytes(sctp->sctp_secret, 686 SCTP_SECRET_LEN); 687 sctp->sctp_last_secret_update = nowt; 688 } 689 690 hmac_md5((uchar_t *)now, cookielen - sizeof (*cookieph) - 16, 691 (uchar_t *)sctp->sctp_secret, SCTP_SECRET_LEN, (uchar_t *)p); 692 693 iackmp->b_wptr = iackmp->b_rptr + ipsctplen; 694 iackmp->b_cont = errmp; /* OK if NULL */ 695 696 /* 697 * Stash the conn ptr info. for IP only as e don't have any 698 * cached IRE. 699 */ 700 SCTP_STASH_IPINFO(iackmp, (ire_t *)NULL); 701 702 /* XXX sctp == sctp_g_q, so using its obchunks is valid */ 703 BUMP_LOCAL(sctp->sctp_opkts); 704 BUMP_LOCAL(sctp->sctp_obchunks); 705 706 /* OK to call IP_PUT() here instead of sctp_add_sendq(). */ 707 CONN_INC_REF(sctp->sctp_connp); 708 iackmp->b_flag |= MSGHASREF; 709 IP_PUT(iackmp, sctp->sctp_connp, isv4); 710 } 711 712 void 713 sctp_send_cookie_ack(sctp_t *sctp) 714 { 715 sctp_chunk_hdr_t *cach; 716 mblk_t *camp; 717 718 camp = sctp_make_mp(sctp, NULL, sizeof (*cach)); 719 if (camp == NULL) { 720 /* XXX should abort, but don't have the inmp anymore */ 721 return; 722 } 723 724 cach = (sctp_chunk_hdr_t *)camp->b_wptr; 725 camp->b_wptr = (uchar_t *)(cach + 1); 726 cach->sch_id = CHUNK_COOKIE_ACK; 727 cach->sch_flags = 0; 728 cach->sch_len = htons(sizeof (*cach)); 729 730 sctp_set_iplen(sctp, camp); 731 732 BUMP_LOCAL(sctp->sctp_obchunks); 733 734 sctp_add_sendq(sctp, camp); 735 } 736 737 static int 738 sctp_find_al_ind(sctp_parm_hdr_t *sph, ssize_t len, uint32_t *adaption_code) 739 { 740 741 if (len < sizeof (*sph)) 742 return (-1); 743 while (sph != NULL) { 744 if (sph->sph_type == htons(PARM_ADAPT_LAYER_IND) && 745 ntohs(sph->sph_len) >= (sizeof (*sph) + 746 sizeof (uint32_t))) { 747 *adaption_code = *(uint32_t *)(sph + 1); 748 return (0); 749 } 750 sph = sctp_next_parm(sph, &len); 751 } 752 return (-1); 753 } 754 755 void 756 sctp_send_cookie_echo(sctp_t *sctp, sctp_chunk_hdr_t *iackch, mblk_t *iackmp) 757 { 758 mblk_t *cemp; 759 mblk_t *mp = NULL; 760 mblk_t *head; 761 mblk_t *meta; 762 sctp_faddr_t *fp; 763 sctp_chunk_hdr_t *cech; 764 sctp_init_chunk_t *iack; 765 int32_t cansend; 766 int32_t seglen; 767 size_t ceclen; 768 sctp_parm_hdr_t *cph; 769 sctp_data_hdr_t *sdc; 770 sctp_tf_t *tf; 771 int pad = 0; 772 int hdrlen; 773 mblk_t *errmp = NULL; 774 uint_t sctp_options; 775 int error; 776 uint16_t old_num_str; 777 778 iack = (sctp_init_chunk_t *)(iackch + 1); 779 780 cph = NULL; 781 if (validate_init_params(sctp, iackch, iack, iackmp, &cph, &errmp, 782 &pad, &sctp_options) == 0) { /* result in 'pad' ignored */ 783 BUMP_MIB(&sctp_mib, sctpAborted); 784 sctp_assoc_event(sctp, SCTP_CANT_STR_ASSOC, 0, NULL); 785 sctp_clean_death(sctp, ECONNABORTED); 786 return; 787 } 788 ASSERT(cph != NULL); 789 790 ASSERT(sctp->sctp_cookie_mp == NULL); 791 792 /* Got a cookie to echo back; allocate an mblk */ 793 ceclen = sizeof (*cech) + ntohs(cph->sph_len) - sizeof (*cph); 794 if ((pad = ceclen & (SCTP_ALIGN - 1)) != 0) 795 pad = SCTP_ALIGN - pad; 796 797 if (IPH_HDR_VERSION(iackmp->b_rptr) == IPV4_VERSION) 798 hdrlen = sctp->sctp_hdr_len; 799 else 800 hdrlen = sctp->sctp_hdr6_len; 801 802 cemp = allocb(sctp_wroff_xtra + hdrlen + ceclen + pad, BPRI_MED); 803 if (cemp == NULL) { 804 SCTP_FADDR_TIMER_RESTART(sctp, sctp->sctp_current, 805 sctp->sctp_current->rto); 806 if (errmp != NULL) 807 freeb(errmp); 808 return; 809 } 810 cemp->b_rptr += (sctp_wroff_xtra + hdrlen); 811 812 /* Process the INIT ACK */ 813 sctp->sctp_sctph->sh_verf = iack->sic_inittag; 814 sctp->sctp_sctph6->sh_verf = iack->sic_inittag; 815 sctp->sctp_fvtag = iack->sic_inittag; 816 sctp->sctp_ftsn = ntohl(iack->sic_inittsn); 817 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 818 sctp->sctp_fcsn = sctp->sctp_lastacked; 819 sctp->sctp_frwnd = ntohl(iack->sic_a_rwnd); 820 821 /* 822 * Populate sctp with addresses given in the INIT ACK or IP header. 823 * Need to set the df bit in the current fp as it has been cleared 824 * in sctp_connect(). 825 */ 826 sctp->sctp_current->df = B_TRUE; 827 /* 828 * Since IP uses this info during the fanout process, we need to hold 829 * the lock for this hash line while performing this operation. 830 */ 831 /* XXX sctp_conn_fanout + SCTP_CONN_HASH(sctp->sctp_ports); */ 832 ASSERT(sctp->sctp_conn_tfp != NULL); 833 tf = sctp->sctp_conn_tfp; 834 /* sctp isn't a listener so only need to hold conn fanout lock */ 835 mutex_enter(&tf->tf_lock); 836 if (sctp_get_addrparams(sctp, NULL, iackmp, iackch, NULL) != 0) { 837 mutex_exit(&tf->tf_lock); 838 freeb(cemp); 839 SCTP_FADDR_TIMER_RESTART(sctp, sctp->sctp_current, 840 sctp->sctp_current->rto); 841 if (errmp != NULL) 842 freeb(errmp); 843 return; 844 } 845 mutex_exit(&tf->tf_lock); 846 847 fp = sctp->sctp_current; 848 849 /* 850 * There could be a case when we get an INIT-ACK again, if the INIT 851 * is re-transmitted, for e.g., which means we would have already 852 * allocated this resource earlier (also for sctp_instr). In this 853 * case we check and re-allocate, if necessary. 854 */ 855 old_num_str = sctp->sctp_num_ostr; 856 if (ntohs(iack->sic_instr) < sctp->sctp_num_ostr) 857 sctp->sctp_num_ostr = ntohs(iack->sic_instr); 858 if (sctp->sctp_ostrcntrs == NULL) { 859 sctp->sctp_ostrcntrs = kmem_zalloc(sizeof (uint16_t) * 860 sctp->sctp_num_ostr, KM_NOSLEEP); 861 } else { 862 ASSERT(old_num_str > 0); 863 if (old_num_str != sctp->sctp_num_ostr) { 864 kmem_free(sctp->sctp_ostrcntrs, sizeof (uint16_t) * 865 old_num_str); 866 sctp->sctp_ostrcntrs = kmem_zalloc(sizeof (uint16_t) * 867 sctp->sctp_num_ostr, KM_NOSLEEP); 868 } 869 } 870 if (sctp->sctp_ostrcntrs == NULL) { 871 freeb(cemp); 872 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 873 if (errmp != NULL) 874 freeb(errmp); 875 return; 876 } 877 878 /* 879 * Allocate the in stream tracking array. Comments for sctp_ostrcntrs 880 * hold here too. 881 */ 882 old_num_str = sctp->sctp_num_istr; 883 if (ntohs(iack->sic_outstr) < sctp->sctp_num_istr) 884 sctp->sctp_num_istr = ntohs(iack->sic_outstr); 885 if (sctp->sctp_instr == NULL) { 886 sctp->sctp_instr = kmem_zalloc(sizeof (*sctp->sctp_instr) * 887 sctp->sctp_num_istr, KM_NOSLEEP); 888 } else { 889 ASSERT(old_num_str > 0); 890 if (old_num_str != sctp->sctp_num_istr) { 891 kmem_free(sctp->sctp_instr, 892 sizeof (*sctp->sctp_instr) * old_num_str); 893 sctp->sctp_instr = kmem_zalloc( 894 sizeof (*sctp->sctp_instr) * sctp->sctp_num_istr, 895 KM_NOSLEEP); 896 } 897 } 898 if (sctp->sctp_instr == NULL) { 899 kmem_free(sctp->sctp_ostrcntrs, 900 sizeof (uint16_t) * sctp->sctp_num_ostr); 901 freeb(cemp); 902 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 903 if (errmp != NULL) 904 freeb(errmp); 905 return; 906 } 907 908 if (!(sctp_options & SCTP_PRSCTP_OPTION) && sctp->sctp_prsctp_aware) 909 sctp->sctp_prsctp_aware = B_FALSE; 910 911 if (sctp_find_al_ind((sctp_parm_hdr_t *)(iack + 1), 912 ntohs(iackch->sch_len) - (sizeof (*iackch) + sizeof (*iack)), 913 &sctp->sctp_rx_adaption_code) == 0) { 914 sctp->sctp_recv_adaption = 1; 915 } 916 917 cech = (sctp_chunk_hdr_t *)cemp->b_rptr; 918 ASSERT(OK_32PTR(cech)); 919 cech->sch_id = CHUNK_COOKIE; 920 cech->sch_flags = 0; 921 cech->sch_len = htons(ceclen); 922 923 /* Copy the cookie (less the parm hdr) to the chunk */ 924 bcopy(cph + 1, cech + 1, ceclen - sizeof (*cph)); 925 926 cemp->b_wptr = cemp->b_rptr + ceclen; 927 928 if (sctp->sctp_unsent > 0) { 929 sctp_msg_hdr_t *smh; 930 mblk_t *prev = NULL; 931 uint32_t unsent = 0; 932 933 mp = sctp->sctp_xmit_unsent; 934 do { 935 smh = (sctp_msg_hdr_t *)mp->b_rptr; 936 if (smh->smh_sid >= sctp->sctp_num_ostr) { 937 unsent += smh->smh_msglen; 938 if (prev != NULL) 939 prev->b_next = mp->b_next; 940 else 941 sctp->sctp_xmit_unsent = mp->b_next; 942 mp->b_next = NULL; 943 sctp_sendfail_event(sctp, mp, SCTP_ERR_BAD_SID, 944 B_FALSE); 945 if (prev != NULL) 946 mp = prev->b_next; 947 else 948 mp = sctp->sctp_xmit_unsent; 949 } else { 950 prev = mp; 951 mp = mp->b_next; 952 } 953 } while (mp != NULL); 954 if (unsent > 0) { 955 ASSERT(sctp->sctp_unsent >= unsent); 956 sctp->sctp_unsent -= unsent; 957 /* 958 * Update ULP the amount of queued data, which is 959 * sent-unack'ed + unsent. 960 * This is not necessary, but doesn't harm, we 961 * just use unsent instead of sent-unack'ed + 962 * unsent, since there won't be any sent-unack'ed 963 * here. 964 */ 965 if (!SCTP_IS_DETACHED(sctp)) { 966 sctp->sctp_ulp_xmitted(sctp->sctp_ulpd, 967 sctp->sctp_unsent); 968 } 969 } 970 if (sctp->sctp_xmit_unsent == NULL) 971 sctp->sctp_xmit_unsent_tail = NULL; 972 } 973 ceclen += pad; 974 cansend = MIN(sctp->sctp_unsent, sctp->sctp_frwnd); 975 meta = sctp_get_msg_to_send(sctp, &mp, NULL, &error, ceclen, 976 cansend, NULL); 977 /* 978 * The error cannot be anything else since we could have an non-zero 979 * error only if sctp_get_msg_to_send() tries to send a Forward 980 * TSN which will not happen here. 981 */ 982 ASSERT(error == 0); 983 if (meta == NULL) 984 goto sendcookie; 985 sctp->sctp_xmit_tail = meta; 986 sdc = (sctp_data_hdr_t *)mp->b_rptr; 987 seglen = ntohs(sdc->sdh_len); 988 if ((ceclen + seglen) > fp->sfa_pmss || 989 (seglen - sizeof (*sdc)) > cansend) { 990 goto sendcookie; 991 } 992 /* OK, if this fails */ 993 cemp->b_cont = dupmsg(mp); 994 sendcookie: 995 head = sctp_add_proto_hdr(sctp, fp, cemp, 0, NULL); 996 if (head == NULL) { 997 freemsg(cemp); 998 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 999 if (errmp != NULL) 1000 freeb(errmp); 1001 return; 1002 } 1003 /* 1004 * Even if cookie-echo exceeds MTU for one of the hops, it'll 1005 * have a chance of getting there. 1006 */ 1007 if (fp->isv4) { 1008 ipha_t *iph = (ipha_t *)head->b_rptr; 1009 iph->ipha_fragment_offset_and_flags = 0; 1010 } 1011 BUMP_LOCAL(sctp->sctp_obchunks); 1012 1013 sctp->sctp_cookie_mp = dupmsg(head); 1014 /* Don't bundle, we will just resend init if this cookie is lost. */ 1015 if (sctp->sctp_cookie_mp == NULL) { 1016 if (cemp->b_cont != NULL) { 1017 freemsg(cemp->b_cont); 1018 cemp->b_cont = NULL; 1019 } 1020 } else if (cemp->b_cont != NULL) { 1021 ASSERT(mp != NULL && mp == meta->b_cont); 1022 SCTP_CHUNK_CLEAR_FLAGS(cemp->b_cont); 1023 cemp->b_wptr += pad; 1024 seglen -= sizeof (*sdc); 1025 SCTP_CHUNK_SENT(sctp, mp, sdc, fp, seglen, meta); 1026 } 1027 if (errmp != NULL) 1028 linkb(head, errmp); 1029 sctp->sctp_state = SCTPS_COOKIE_ECHOED; 1030 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 1031 1032 sctp_set_iplen(sctp, head); 1033 sctp_add_sendq(sctp, head); 1034 } 1035 1036 int 1037 sctp_process_cookie(sctp_t *sctp, sctp_chunk_hdr_t *ch, mblk_t *cmp, 1038 sctp_init_chunk_t **iackpp, sctp_hdr_t *insctph, int *recv_adaption, 1039 in6_addr_t *peer_addr) 1040 { 1041 int32_t clen; 1042 size_t initplen; 1043 uchar_t *p; 1044 uchar_t *given_hash; 1045 uchar_t needed_hash[16]; 1046 int64_t ts; 1047 int64_t diff; 1048 uint32_t *lt; 1049 sctp_init_chunk_t *iack; 1050 sctp_chunk_hdr_t *initch; 1051 sctp_init_chunk_t *init; 1052 uint32_t *lttag; 1053 uint32_t *fttag; 1054 uint32_t ports; 1055 1056 BUMP_LOCAL(sctp->sctp_ibchunks); 1057 /* Verify the ICV */ 1058 clen = ntohs(ch->sch_len) - sizeof (*ch) - 16; 1059 if (clen < 0) { 1060 dprint(1, ("invalid cookie chunk length %d\n", 1061 ntohs(ch->sch_len))); 1062 1063 return (-1); 1064 } 1065 p = (uchar_t *)(ch + 1); 1066 1067 hmac_md5(p, clen, (uchar_t *)sctp->sctp_secret, SCTP_SECRET_LEN, 1068 needed_hash); 1069 1070 /* The given hash follows the cookie data */ 1071 given_hash = p + clen; 1072 1073 if (bcmp(given_hash, needed_hash, 16) != 0) { 1074 /* The secret may have changed; try the old secret */ 1075 hmac_md5(p, clen, (uchar_t *)sctp->sctp_old_secret, 1076 SCTP_SECRET_LEN, needed_hash); 1077 if (bcmp(given_hash, needed_hash, 16) != 0) { 1078 return (-1); 1079 } 1080 } 1081 1082 /* Timestamp is int64_t, and we only guarantee 32-bit alignment */ 1083 bcopy(p, &ts, sizeof (ts)); 1084 /* Cookie life time, int32_t */ 1085 lt = (uint32_t *)(p + sizeof (ts)); 1086 1087 /* 1088 * To quote PRC, "this is our baby", so let's continue. 1089 * We need to pull out the encapsulated INIT ACK and 1090 * INIT chunks. Note that we don't process these until 1091 * we have verified the timestamp, but we need them before 1092 * processing the timestamp since if the time check fails, 1093 * we need to get the verification tag from the INIT in order 1094 * to send a stale cookie error. 1095 */ 1096 lttag = (uint32_t *)(lt + 1); 1097 fttag = lttag + 1; 1098 if (peer_addr != NULL) 1099 bcopy(fttag + 1, peer_addr, sizeof (in6_addr_t)); 1100 iack = (sctp_init_chunk_t *)((char *)(fttag + 1) + sizeof (in6_addr_t)); 1101 initch = (sctp_chunk_hdr_t *)(iack + 1); 1102 init = (sctp_init_chunk_t *)(initch + 1); 1103 initplen = ntohs(initch->sch_len) - (sizeof (*init) + sizeof (*initch)); 1104 *iackpp = iack; 1105 *recv_adaption = 0; 1106 1107 /* Check the timestamp */ 1108 diff = lbolt64 - ts; 1109 if (diff > *lt && (init->sic_inittag != sctp->sctp_fvtag || 1110 iack->sic_inittag != sctp->sctp_lvtag)) { 1111 1112 uint32_t staleness; 1113 1114 staleness = TICK_TO_USEC(diff); 1115 staleness = htonl(staleness); 1116 sctp_send_abort(sctp, init->sic_inittag, SCTP_ERR_STALE_COOKIE, 1117 (char *)&staleness, sizeof (staleness), cmp, 1, B_FALSE); 1118 1119 dprint(1, ("stale cookie %d\n", staleness)); 1120 1121 return (-1); 1122 } 1123 1124 /* Check for attack by adding addresses to a restart */ 1125 bcopy(insctph, &ports, sizeof (ports)); 1126 if (sctp_secure_restart_check(cmp, initch, ports, KM_NOSLEEP) != 1) { 1127 return (-1); 1128 } 1129 1130 /* Look for adaptation code if there any parms in the INIT chunk */ 1131 if ((initplen >= sizeof (sctp_parm_hdr_t)) && 1132 (sctp_find_al_ind((sctp_parm_hdr_t *)(init + 1), initplen, 1133 &sctp->sctp_rx_adaption_code) == 0)) { 1134 *recv_adaption = 1; 1135 } 1136 1137 /* Examine tie-tags */ 1138 1139 if (sctp->sctp_state >= SCTPS_COOKIE_WAIT) { 1140 if (sctp->sctp_state == SCTPS_ESTABLISHED && 1141 init->sic_inittag == sctp->sctp_fvtag && 1142 iack->sic_inittag == sctp->sctp_lvtag && 1143 *fttag == 0 && *lttag == 0) { 1144 1145 dprint(1, ("duplicate cookie from %x:%x:%x:%x (%d)\n", 1146 SCTP_PRINTADDR(sctp->sctp_current->faddr), 1147 (int)(sctp->sctp_fport))); 1148 return (-1); 1149 } 1150 1151 if (init->sic_inittag != sctp->sctp_fvtag && 1152 iack->sic_inittag != sctp->sctp_lvtag && 1153 *fttag == sctp->sctp_fvtag && 1154 *lttag == sctp->sctp_lvtag) { 1155 int i; 1156 1157 /* Section 5.2.4 case A: restart */ 1158 sctp->sctp_fvtag = init->sic_inittag; 1159 sctp->sctp_lvtag = iack->sic_inittag; 1160 1161 sctp->sctp_sctph->sh_verf = init->sic_inittag; 1162 sctp->sctp_sctph6->sh_verf = init->sic_inittag; 1163 1164 sctp->sctp_ftsn = ntohl(init->sic_inittsn); 1165 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 1166 sctp->sctp_frwnd = ntohl(init->sic_a_rwnd); 1167 sctp->sctp_fcsn = sctp->sctp_lastacked; 1168 1169 if (sctp->sctp_state < SCTPS_ESTABLISHED) { 1170 sctp->sctp_state = SCTPS_ESTABLISHED; 1171 sctp->sctp_assoc_start_time = (uint32_t)lbolt; 1172 } 1173 1174 dprint(1, ("sctp peer %x:%x:%x:%x (%d) restarted\n", 1175 SCTP_PRINTADDR(sctp->sctp_current->faddr), 1176 (int)(sctp->sctp_fport))); 1177 /* reset parameters */ 1178 sctp_congest_reset(sctp); 1179 1180 /* reset stream bookkeeping */ 1181 sctp_instream_cleanup(sctp, B_FALSE); 1182 1183 sctp->sctp_istr_nmsgs = 0; 1184 sctp->sctp_rxqueued = 0; 1185 for (i = 0; i < sctp->sctp_num_ostr; i++) { 1186 sctp->sctp_ostrcntrs[i] = 0; 1187 } 1188 /* XXX flush xmit_list? */ 1189 1190 return (0); 1191 } else if (init->sic_inittag != sctp->sctp_fvtag && 1192 iack->sic_inittag == sctp->sctp_lvtag) { 1193 1194 /* Section 5.2.4 case B: INIT collision */ 1195 if (sctp->sctp_state < SCTPS_ESTABLISHED) { 1196 if (!sctp_initialize_params(sctp, init, iack)) 1197 return (-1); /* Drop? */ 1198 sctp->sctp_state = SCTPS_ESTABLISHED; 1199 sctp->sctp_assoc_start_time = (uint32_t)lbolt; 1200 } 1201 1202 dprint(1, ("init collision with %x:%x:%x:%x (%d)\n", 1203 SCTP_PRINTADDR(sctp->sctp_current->faddr), 1204 (int)(sctp->sctp_fport))); 1205 1206 return (0); 1207 } else if (iack->sic_inittag != sctp->sctp_lvtag && 1208 init->sic_inittag == sctp->sctp_fvtag && 1209 *fttag == 0 && *lttag == 0) { 1210 1211 /* Section 5.2.4 case C: late COOKIE */ 1212 dprint(1, ("late cookie from %x:%x:%x:%x (%d)\n", 1213 SCTP_PRINTADDR(sctp->sctp_current->faddr), 1214 (int)(sctp->sctp_fport))); 1215 return (-1); 1216 } else if (init->sic_inittag == sctp->sctp_fvtag && 1217 iack->sic_inittag == sctp->sctp_lvtag) { 1218 1219 /* 1220 * Section 5.2.4 case D: COOKIE ECHO retransmit 1221 * Don't check cookie lifetime 1222 */ 1223 dprint(1, ("cookie tags match from %x:%x:%x:%x (%d)\n", 1224 SCTP_PRINTADDR(sctp->sctp_current->faddr), 1225 (int)(sctp->sctp_fport))); 1226 if (sctp->sctp_state < SCTPS_ESTABLISHED) { 1227 if (!sctp_initialize_params(sctp, init, iack)) 1228 return (-1); /* Drop? */ 1229 sctp->sctp_state = SCTPS_ESTABLISHED; 1230 sctp->sctp_assoc_start_time = (uint32_t)lbolt; 1231 } 1232 return (0); 1233 } else { 1234 /* unrecognized case -- silently drop it */ 1235 return (-1); 1236 } 1237 } 1238 1239 return (0); 1240 } 1241 1242 /* 1243 * Similar to ip_fanout_sctp, except that the src addr(s) are drawn 1244 * from address parameters in an INIT ACK's address list. This 1245 * function is used when an INIT ACK is received but IP's fanout 1246 * function could not find a sctp via the normal lookup routine. 1247 * This can happen when a host sends an INIT ACK from a different 1248 * address than the INIT was sent to. 1249 * 1250 * Returns the sctp_t if found, or NULL if not found. 1251 */ 1252 sctp_t * 1253 sctp_addrlist2sctp(mblk_t *mp, sctp_hdr_t *sctph, sctp_chunk_hdr_t *ich, 1254 uint_t ipif_seqid, zoneid_t zoneid) 1255 { 1256 int isv4; 1257 ipha_t *iph; 1258 ip6_t *ip6h; 1259 in6_addr_t dst; 1260 in6_addr_t src; 1261 sctp_parm_hdr_t *ph; 1262 ssize_t remaining; 1263 sctp_init_chunk_t *iack; 1264 uint32_t ports; 1265 sctp_t *sctp = NULL; 1266 1267 ASSERT(ich->sch_id == CHUNK_INIT_ACK); 1268 1269 isv4 = (IPH_HDR_VERSION(mp->b_rptr) == IPV4_VERSION); 1270 if (isv4) { 1271 iph = (ipha_t *)mp->b_rptr; 1272 IN6_IPADDR_TO_V4MAPPED(iph->ipha_dst, &dst); 1273 } else { 1274 ip6h = (ip6_t *)mp->b_rptr; 1275 dst = ip6h->ip6_dst; 1276 } 1277 1278 ports = *(uint32_t *)sctph; 1279 1280 dprint(1, ("sctp_addrlist2sctp: ports=%u, dst = %x:%x:%x:%x\n", 1281 ports, SCTP_PRINTADDR(dst))); 1282 1283 /* pull out any address parameters */ 1284 remaining = ntohs(ich->sch_len) - sizeof (*ich) - sizeof (*iack); 1285 if (remaining < sizeof (*ph)) { 1286 return (NULL); 1287 } 1288 1289 iack = (sctp_init_chunk_t *)(ich + 1); 1290 ph = (sctp_parm_hdr_t *)(iack + 1); 1291 1292 while (ph != NULL) { 1293 /* 1294 * params have been put in host byteorder by 1295 * sctp_check_input() 1296 */ 1297 if (ph->sph_type == PARM_ADDR4) { 1298 IN6_INADDR_TO_V4MAPPED((struct in_addr *)(ph + 1), 1299 &src); 1300 1301 sctp = sctp_conn_match(&src, &dst, ports, ipif_seqid, 1302 zoneid); 1303 1304 dprint(1, 1305 ("sctp_addrlist2sctp: src=%x:%x:%x:%x, sctp=%p\n", 1306 SCTP_PRINTADDR(src), sctp)); 1307 1308 1309 if (sctp != NULL) { 1310 return (sctp); 1311 } 1312 } else if (ph->sph_type == PARM_ADDR6) { 1313 src = *(in6_addr_t *)(ph + 1); 1314 sctp = sctp_conn_match(&src, &dst, ports, ipif_seqid, 1315 zoneid); 1316 1317 dprint(1, 1318 ("sctp_addrlist2sctp: src=%x:%x:%x:%x, sctp=%p\n", 1319 SCTP_PRINTADDR(src), sctp)); 1320 1321 if (sctp != NULL) { 1322 return (sctp); 1323 } 1324 } 1325 1326 ph = sctp_next_parm(ph, &remaining); 1327 } 1328 1329 return (NULL); 1330 } 1331