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 2006 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 #include <sys/tsol/tnet.h> 38 39 #include <netinet/in.h> 40 #include <netinet/ip6.h> 41 42 #include <inet/common.h> 43 #include <inet/ip.h> 44 #include <inet/ip6.h> 45 #include <inet/sctp_ip.h> 46 #include <inet/ipclassifier.h> 47 #include "sctp_impl.h" 48 49 /* 50 * Helper function for SunCluster (PSARC/2005/602) to get the original source 51 * address from the COOKIE 52 */ 53 int cl_sctp_cookie_paddr(sctp_chunk_hdr_t *, in6_addr_t *); 54 55 /* 56 * From RFC 2104. This should probably go into libmd5 (and while 57 * we're at it, maybe we should make a libdigest so we can later 58 * add SHA1 and others, esp. since some weaknesses have been found 59 * with MD5). 60 * 61 * text IN pointer to data stream 62 * text_len IN length of data stream 63 * key IN pointer to authentication key 64 * key_len IN length of authentication key 65 * digest OUT caller digest to be filled in 66 */ 67 static void 68 hmac_md5(uchar_t *text, size_t text_len, uchar_t *key, size_t key_len, 69 uchar_t *digest) 70 { 71 MD5_CTX context; 72 uchar_t k_ipad[65]; /* inner padding - key XORd with ipad */ 73 uchar_t k_opad[65]; /* outer padding - key XORd with opad */ 74 uchar_t tk[16]; 75 int i; 76 77 /* if key is longer than 64 bytes reset it to key=MD5(key) */ 78 if (key_len > 64) { 79 MD5_CTX tctx; 80 81 MD5Init(&tctx); 82 MD5Update(&tctx, key, key_len); 83 MD5Final(tk, &tctx); 84 85 key = tk; 86 key_len = 16; 87 } 88 89 /* 90 * the HMAC_MD5 transform looks like: 91 * 92 * MD5(K XOR opad, MD5(K XOR ipad, text)) 93 * 94 * where K is an n byte key 95 * ipad is the byte 0x36 repeated 64 times 96 * opad is the byte 0x5c repeated 64 times 97 * and text is the data being protected 98 */ 99 100 /* start out by storing key in pads */ 101 bzero(k_ipad, sizeof (k_ipad)); 102 bzero(k_opad, sizeof (k_opad)); 103 bcopy(key, k_ipad, key_len); 104 bcopy(key, k_opad, key_len); 105 106 /* XOR key with ipad and opad values */ 107 for (i = 0; i < 64; i++) { 108 k_ipad[i] ^= 0x36; 109 k_opad[i] ^= 0x5c; 110 } 111 /* 112 * perform inner MD5 113 */ 114 MD5Init(&context); /* init context for 1st */ 115 /* pass */ 116 MD5Update(&context, k_ipad, 64); /* start with inner pad */ 117 MD5Update(&context, text, text_len); /* then text of datagram */ 118 MD5Final(digest, &context); /* finish up 1st pass */ 119 /* 120 * perform outer MD5 121 */ 122 MD5Init(&context); /* init context for 2nd */ 123 /* pass */ 124 MD5Update(&context, k_opad, 64); /* start with outer pad */ 125 MD5Update(&context, digest, 16); /* then results of 1st */ 126 /* hash */ 127 MD5Final(digest, &context); /* finish up 2nd pass */ 128 } 129 130 /* 131 * If inmp is non-NULL, and we need to abort, it will use the IP/SCTP 132 * info in initmp to send the abort. Otherwise, no abort will be sent. 133 * If errmp is non-NULL, a chain of unrecognized parameters will 134 * be created and returned via *errmp. 135 * 136 * Returns 1 if the parameters are OK (or there are no parameters), or 137 * 0 if not. 138 */ 139 static int 140 validate_init_params(sctp_t *sctp, sctp_chunk_hdr_t *ch, 141 sctp_init_chunk_t *init, mblk_t *inmp, sctp_parm_hdr_t **want_cookie, 142 mblk_t **errmp, int *supp_af, uint_t *sctp_options) 143 { 144 sctp_parm_hdr_t *cph; 145 sctp_init_chunk_t *ic; 146 ssize_t remaining; 147 uint16_t serror = 0; 148 char *details = NULL; 149 size_t errlen = 0; 150 boolean_t got_cookie = B_FALSE; 151 uint16_t ptype; 152 153 if (sctp_options != NULL) 154 *sctp_options = 0; 155 156 /* First validate stream parameters */ 157 if (init->sic_instr == 0 || init->sic_outstr == 0) { 158 serror = SCTP_ERR_BAD_MANDPARM; 159 dprint(1, 160 ("validate_init_params: bad sid, is=%d os=%d\n", 161 htons(init->sic_instr), htons(init->sic_outstr))); 162 goto abort; 163 } 164 if (ntohl(init->sic_inittag) == 0) { 165 serror = SCTP_ERR_BAD_MANDPARM; 166 dprint(1, ("validate_init_params: inittag = 0\n")); 167 goto abort; 168 } 169 170 remaining = ntohs(ch->sch_len) - sizeof (*ch); 171 ic = (sctp_init_chunk_t *)(ch + 1); 172 remaining -= sizeof (*ic); 173 if (remaining < sizeof (*cph)) { 174 /* Nothing to validate */ 175 if (want_cookie != NULL) 176 goto cookie_abort; 177 return (1); 178 } 179 180 cph = (sctp_parm_hdr_t *)(ic + 1); 181 182 while (cph != NULL) { 183 ptype = ntohs(cph->sph_type); 184 switch (ptype) { 185 case PARM_HBINFO: 186 case PARM_UNRECOGNIZED: 187 case PARM_ECN: 188 /* just ignore them */ 189 break; 190 case PARM_FORWARD_TSN: 191 if (sctp_options != NULL) 192 *sctp_options |= SCTP_PRSCTP_OPTION; 193 break; 194 case PARM_COOKIE: 195 got_cookie = B_TRUE; 196 if (want_cookie != NULL) { 197 *want_cookie = cph; 198 } 199 break; 200 case PARM_ADDR4: 201 *supp_af |= PARM_SUPP_V4; 202 break; 203 case PARM_ADDR6: 204 *supp_af |= PARM_SUPP_V6; 205 break; 206 case PARM_COOKIE_PRESERVE: 207 case PARM_ADAPT_LAYER_IND: 208 /* These are OK */ 209 break; 210 case PARM_ADDR_HOST_NAME: 211 /* Don't support this; abort the association */ 212 serror = SCTP_ERR_BAD_ADDR; 213 details = (char *)cph; 214 errlen = ntohs(cph->sph_len); 215 dprint(1, ("sctp:validate_init_params: host addr\n")); 216 goto abort; 217 case PARM_SUPP_ADDRS: { 218 /* Make sure we have a supported addr intersection */ 219 uint16_t *p, addrtype; 220 int plen; 221 222 plen = ntohs(cph->sph_len); 223 p = (uint16_t *)(cph + 1); 224 while (plen > 0) { 225 addrtype = ntohs(*p); 226 switch (addrtype) { 227 case PARM_ADDR6: 228 *supp_af |= PARM_SUPP_V6; 229 break; 230 case PARM_ADDR4: 231 *supp_af |= PARM_SUPP_V4; 232 break; 233 default: 234 /* 235 * Do nothing, silently ignore hostname 236 * address. 237 */ 238 break; 239 } 240 p++; 241 plen -= sizeof (*p); 242 } 243 break; 244 } 245 default: 246 /* Unrecognized param; check the high order bits */ 247 if ((ptype & 0xc000) == 0xc000) { 248 /* 249 * report unrecognized param, and 250 * keep processing 251 */ 252 if (errmp != NULL) { 253 if (want_cookie != NULL) { 254 *errmp = sctp_make_err(sctp, 255 PARM_UNRECOGNIZED, 256 (void *)cph, 257 ntohs(cph->sph_len)); 258 } else { 259 sctp_add_unrec_parm(cph, errmp); 260 } 261 } 262 break; 263 } 264 if (ptype & 0x4000) { 265 /* 266 * Stop processing and drop; report 267 * unrecognized param 268 */ 269 serror = SCTP_ERR_UNREC_PARM; 270 details = (char *)cph; 271 errlen = ntohs(cph->sph_len); 272 goto abort; 273 } 274 if (ptype & 0x8000) { 275 /* skip and continue processing */ 276 break; 277 } 278 279 /* 280 * 2 high bits are clear; stop processing and 281 * drop packet 282 */ 283 return (0); 284 } 285 286 cph = sctp_next_parm(cph, &remaining); 287 } 288 /* 289 * Some sanity checks. The following should not fail unless the 290 * other side is broken. 291 * 292 * 1. If this is a V4 endpoint but V4 address is not 293 * supported, abort. 294 * 2. If this is a V6 only endpoint but V6 address is 295 * not supported, abort. This assumes that a V6 296 * endpoint can use both V4 and V6 addresses. 297 * We only care about supp_af when processing INIT, i.e want_cookie 298 * is NULL. 299 */ 300 if (want_cookie == NULL && 301 ((sctp->sctp_family == AF_INET && !(*supp_af & PARM_SUPP_V4)) || 302 (sctp->sctp_family == AF_INET6 && !(*supp_af & PARM_SUPP_V6) && 303 sctp->sctp_connp->conn_ipv6_v6only))) { 304 dprint(1, ("sctp:validate_init_params: supp addr\n")); 305 serror = SCTP_ERR_BAD_ADDR; 306 goto abort; 307 } 308 309 if (want_cookie != NULL && !got_cookie) { 310 cookie_abort: 311 dprint(1, ("validate_init_params: cookie absent\n")); 312 sctp_send_abort(sctp, sctp_init2vtag(ch), SCTP_ERR_MISSING_PARM, 313 details, errlen, inmp, 0, B_FALSE); 314 return (0); 315 } 316 317 /* OK */ 318 return (1); 319 320 abort: 321 if (want_cookie != NULL) 322 return (0); 323 324 sctp_send_abort(sctp, sctp_init2vtag(ch), serror, details, 325 errlen, inmp, 0, B_FALSE); 326 return (0); 327 } 328 329 /* 330 * Initialize params from the INIT and INIT-ACK when the assoc. is 331 * established. 332 */ 333 boolean_t 334 sctp_initialize_params(sctp_t *sctp, sctp_init_chunk_t *init, 335 sctp_init_chunk_t *iack) 336 { 337 /* Get initial TSN */ 338 sctp->sctp_ftsn = ntohl(init->sic_inittsn); 339 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 340 341 /* Serial number is initialized to the same value as the TSN */ 342 sctp->sctp_fcsn = sctp->sctp_lastacked; 343 344 /* 345 * Get verification tags; no byteordering is necessary, since 346 * verfication tags are never processed except for byte-by-byte 347 * comparisons. 348 */ 349 sctp->sctp_fvtag = init->sic_inittag; 350 sctp->sctp_sctph->sh_verf = init->sic_inittag; 351 sctp->sctp_sctph6->sh_verf = init->sic_inittag; 352 sctp->sctp_lvtag = iack->sic_inittag; 353 354 /* Get the peer's rwnd */ 355 sctp->sctp_frwnd = ntohl(init->sic_a_rwnd); 356 357 /* Allocate the in/out-stream counters */ 358 sctp->sctp_num_ostr = iack->sic_outstr; 359 sctp->sctp_ostrcntrs = kmem_zalloc(sizeof (uint16_t) * 360 sctp->sctp_num_ostr, KM_NOSLEEP); 361 if (sctp->sctp_ostrcntrs == NULL) 362 return (B_FALSE); 363 364 sctp->sctp_num_istr = iack->sic_instr; 365 sctp->sctp_instr = kmem_zalloc(sizeof (*sctp->sctp_instr) * 366 sctp->sctp_num_istr, KM_NOSLEEP); 367 if (sctp->sctp_instr == NULL) { 368 kmem_free(sctp->sctp_ostrcntrs, sizeof (uint16_t) * 369 sctp->sctp_num_ostr); 370 sctp->sctp_ostrcntrs = NULL; 371 return (B_FALSE); 372 } 373 return (B_TRUE); 374 } 375 376 /* 377 * Copy the peer's original source address into addr. This relies on the 378 * following format (see sctp_send_initack() below): 379 * relative timestamp for the cookie (int64_t) + 380 * cookie lifetime (uint32_t) + 381 * local tie-tag (uint32_t) + peer tie-tag (uint32_t) + 382 * Peer's original src ... 383 */ 384 int 385 cl_sctp_cookie_paddr(sctp_chunk_hdr_t *ch, in6_addr_t *addr) 386 { 387 uchar_t *off; 388 389 ASSERT(addr != NULL); 390 391 if (ch->sch_id != CHUNK_COOKIE) 392 return (EINVAL); 393 394 off = (uchar_t *)ch + sizeof (*ch) + sizeof (int64_t) + 395 sizeof (uint32_t) + sizeof (uint32_t) + sizeof (uint32_t); 396 397 bcopy(off, addr, sizeof (*addr)); 398 399 return (0); 400 } 401 402 #define SCTP_CALC_COOKIE_LEN(initcp) \ 403 sizeof (int64_t) + /* timestamp */ \ 404 sizeof (uint32_t) + /* cookie lifetime */ \ 405 sizeof (sctp_init_chunk_t) + /* INIT ACK */ \ 406 sizeof (in6_addr_t) + /* peer's original source */ \ 407 ntohs((initcp)->sch_len) + /* peer's INIT */ \ 408 sizeof (uint32_t) + /* local tie-tag */ \ 409 sizeof (uint32_t) + /* peer tie-tag */ \ 410 sizeof (sctp_parm_hdr_t) + /* param header */ \ 411 16 /* MD5 hash */ 412 413 void 414 sctp_send_initack(sctp_t *sctp, sctp_hdr_t *initsh, sctp_chunk_hdr_t *ch, 415 mblk_t *initmp) 416 { 417 ipha_t *initiph; 418 ip6_t *initip6h; 419 ipha_t *iackiph; 420 ip6_t *iackip6h; 421 sctp_chunk_hdr_t *iack_ch; 422 sctp_init_chunk_t *iack; 423 sctp_init_chunk_t *init; 424 sctp_hdr_t *iacksh; 425 size_t cookielen; 426 size_t iacklen; 427 size_t ipsctplen; 428 size_t errlen = 0; 429 sctp_parm_hdr_t *cookieph; 430 mblk_t *iackmp; 431 uint32_t itag; 432 uint32_t itsn; 433 int64_t *now; 434 int64_t nowt; 435 uint32_t *lifetime; 436 char *p; 437 boolean_t isv4; 438 int supp_af = 0; 439 uint_t sctp_options; 440 uint32_t *ttag; 441 int pad; 442 mblk_t *errmp = NULL; 443 boolean_t initcollision = B_FALSE; 444 boolean_t linklocal = B_FALSE; 445 cred_t *cr; 446 ts_label_t *initlabel; 447 448 BUMP_LOCAL(sctp->sctp_ibchunks); 449 isv4 = (IPH_HDR_VERSION(initmp->b_rptr) == IPV4_VERSION); 450 451 /* Extract the INIT chunk */ 452 if (isv4) { 453 initiph = (ipha_t *)initmp->b_rptr; 454 ipsctplen = sctp->sctp_ip_hdr_len; 455 supp_af |= PARM_SUPP_V4; 456 } else { 457 initip6h = (ip6_t *)initmp->b_rptr; 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 } 536 537 /* 538 * If the listen socket is bound to a trusted extensions 539 * multi-label port, attach a copy of the listener's cred 540 * to the new INITACK mblk. Modify the cred to contain 541 * the security label of the received INIT packet. 542 * If not a multi-label port, attach the unmodified 543 * listener's cred directly. 544 * 545 * We expect Sun developed kernel modules to properly set 546 * cred labels for sctp connections. We can't be so sure this 547 * will be done correctly when 3rd party kernel modules 548 * directly use sctp. The initlabel panic guard logic was 549 * added to cover this possibility. 550 */ 551 if (sctp->sctp_connp->conn_mlp_type != mlptSingle) { 552 initlabel = MBLK_GETLABEL(initmp); 553 if (initlabel == NULL) { 554 sctp_send_abort(sctp, sctp_init2vtag(ch), 555 SCTP_ERR_UNKNOWN, NULL, 0, initmp, 0, B_FALSE); 556 return; 557 } 558 cr = copycred_from_bslabel(CONN_CRED(sctp->sctp_connp), 559 &initlabel->tsl_label, initlabel->tsl_doi, KM_NOSLEEP); 560 if (cr == NULL) { 561 sctp_send_abort(sctp, sctp_init2vtag(ch), 562 SCTP_ERR_NO_RESOURCES, NULL, 0, initmp, 0, B_FALSE); 563 return; 564 } 565 iackmp = allocb_cred(ipsctplen + sctp_wroff_xtra, cr); 566 crfree(cr); 567 } else { 568 iackmp = allocb_cred(ipsctplen + sctp_wroff_xtra, 569 CONN_CRED(sctp->sctp_connp)); 570 } 571 if (iackmp == NULL) { 572 sctp_send_abort(sctp, sctp_init2vtag(ch), 573 SCTP_ERR_NO_RESOURCES, NULL, 0, initmp, 0, B_FALSE); 574 return; 575 } 576 577 /* Copy in the [imcomplete] IP/SCTP composite header */ 578 p = (char *)(iackmp->b_rptr + sctp_wroff_xtra); 579 iackmp->b_rptr = (uchar_t *)p; 580 if (isv4) { 581 bcopy(sctp->sctp_iphc, p, sctp->sctp_hdr_len); 582 iackiph = (ipha_t *)p; 583 584 /* Copy the peer's IP addr */ 585 iackiph->ipha_dst = initiph->ipha_src; 586 iackiph->ipha_src = initiph->ipha_dst; 587 iackiph->ipha_length = htons(ipsctplen + errlen); 588 iacksh = (sctp_hdr_t *)(p + sctp->sctp_ip_hdr_len); 589 } else { 590 bcopy(sctp->sctp_iphc6, p, sctp->sctp_hdr6_len); 591 iackip6h = (ip6_t *)p; 592 593 /* Copy the peer's IP addr */ 594 iackip6h->ip6_dst = initip6h->ip6_src; 595 iackip6h->ip6_src = initip6h->ip6_dst; 596 iackip6h->ip6_plen = htons(ipsctplen - sizeof (*iackip6h) + 597 errlen); 598 iacksh = (sctp_hdr_t *)(p + sctp->sctp_ip_hdr6_len); 599 } 600 ASSERT(OK_32PTR(iacksh)); 601 602 /* Fill in the holes in the SCTP common header */ 603 iacksh->sh_sport = initsh->sh_dport; 604 iacksh->sh_dport = initsh->sh_sport; 605 iacksh->sh_verf = init->sic_inittag; 606 607 /* INIT ACK chunk header */ 608 iack_ch = (sctp_chunk_hdr_t *)(iacksh + 1); 609 iack_ch->sch_id = CHUNK_INIT_ACK; 610 iack_ch->sch_flags = 0; 611 iack_ch->sch_len = htons(iacklen); 612 613 /* The INIT ACK itself */ 614 iack = (sctp_init_chunk_t *)(iack_ch + 1); 615 iack->sic_inittag = itag; /* already in network byteorder */ 616 iack->sic_inittsn = htonl(itsn); 617 618 iack->sic_a_rwnd = htonl(sctp->sctp_rwnd); 619 /* Advertise what we would want to have as stream #'s */ 620 iack->sic_outstr = htons(MIN(sctp->sctp_num_ostr, 621 ntohs(init->sic_instr))); 622 iack->sic_instr = htons(sctp->sctp_num_istr); 623 624 p = (char *)(iack + 1); 625 p += sctp_adaption_code_param(sctp, (uchar_t *)p); 626 if (initcollision) 627 p += sctp_supaddr_param(sctp, (uchar_t *)p); 628 if (!linklocal) 629 p += sctp_addr_params(sctp, supp_af, (uchar_t *)p); 630 if (((sctp_options & SCTP_PRSCTP_OPTION) || initcollision) && 631 sctp->sctp_prsctp_aware && sctp_prsctp_enabled) { 632 p += sctp_options_param(sctp, p, SCTP_PRSCTP_OPTION); 633 } 634 /* 635 * Generate and lay in the COOKIE parameter. 636 * 637 * Any change here that results in a change of location for 638 * the peer's orig source address must be propagated to the fn 639 * cl_sctp_cookie_paddr() above. 640 * 641 * The cookie consists of: 642 * 1. The relative timestamp for the cookie (lbolt64) 643 * 2. The cookie lifetime (uint32_t) in tick 644 * 3. The local tie-tag 645 * 4. The peer tie-tag 646 * 5. Peer's original src, used to confirm the validity of address. 647 * 6. Our INIT ACK chunk, less any parameters 648 * 7. The INIT chunk (may contain parameters) 649 * 8. 128-bit MD5 signature. 650 * 651 * Since the timestamp values will only be evaluated locally, we 652 * don't need to worry about byte-ordering them. 653 */ 654 cookieph = (sctp_parm_hdr_t *)p; 655 cookieph->sph_type = htons(PARM_COOKIE); 656 cookieph->sph_len = htons(cookielen); 657 658 /* timestamp */ 659 now = (int64_t *)(cookieph + 1); 660 nowt = lbolt64; 661 bcopy(&nowt, now, sizeof (*now)); 662 663 /* cookie lifetime -- need configuration */ 664 lifetime = (uint32_t *)(now + 1); 665 *lifetime = sctp->sctp_cookie_lifetime; 666 667 /* Set the tie-tags */ 668 ttag = (uint32_t *)(lifetime + 1); 669 if (sctp->sctp_state <= SCTPS_COOKIE_WAIT) { 670 *ttag = 0; 671 ttag++; 672 *ttag = 0; 673 ttag++; 674 } else { 675 /* local tie-tag (network byte-order) */ 676 *ttag = sctp->sctp_lvtag; 677 ttag++; 678 /* peer tie-tag (network byte-order) */ 679 *ttag = sctp->sctp_fvtag; 680 ttag++; 681 } 682 /* 683 * Copy in peer's original source address so that we can confirm 684 * the reachability later. 685 */ 686 p = (char *)ttag; 687 if (isv4) { 688 in6_addr_t peer_addr; 689 690 IN6_IPADDR_TO_V4MAPPED(iackiph->ipha_dst, &peer_addr); 691 bcopy(&peer_addr, p, sizeof (in6_addr_t)); 692 } else { 693 bcopy(&iackip6h->ip6_dst, p, sizeof (in6_addr_t)); 694 } 695 p += sizeof (in6_addr_t); 696 /* Copy in our INIT ACK chunk */ 697 bcopy(iack, p, sizeof (*iack)); 698 iack = (sctp_init_chunk_t *)p; 699 /* Set the # of streams we'll end up using */ 700 iack->sic_outstr = MIN(sctp->sctp_num_ostr, ntohs(init->sic_instr)); 701 iack->sic_instr = MIN(sctp->sctp_num_istr, ntohs(init->sic_outstr)); 702 p += sizeof (*iack); 703 704 /* Copy in the peer's INIT chunk */ 705 bcopy(ch, p, ntohs(ch->sch_len)); 706 p += ntohs(ch->sch_len); 707 708 /* 709 * Calculate the HMAC ICV into the digest slot in buf. 710 * First, generate a new secret if the current secret is 711 * older than the new secret lifetime parameter permits, 712 * copying the current secret to sctp_old_secret. 713 */ 714 if (sctp_new_secret_interval > 0 && 715 (sctp->sctp_last_secret_update + 716 MSEC_TO_TICK(sctp_new_secret_interval)) <= nowt) { 717 bcopy(sctp->sctp_secret, sctp->sctp_old_secret, 718 SCTP_SECRET_LEN); 719 (void) random_get_pseudo_bytes(sctp->sctp_secret, 720 SCTP_SECRET_LEN); 721 sctp->sctp_last_secret_update = nowt; 722 } 723 724 hmac_md5((uchar_t *)now, cookielen - sizeof (*cookieph) - 16, 725 (uchar_t *)sctp->sctp_secret, SCTP_SECRET_LEN, (uchar_t *)p); 726 727 iackmp->b_wptr = iackmp->b_rptr + ipsctplen; 728 iackmp->b_cont = errmp; /* OK if NULL */ 729 730 if (is_system_labeled() && (cr = DB_CRED(iackmp)) != NULL && 731 crgetlabel(cr) != NULL) { 732 conn_t *connp = sctp->sctp_connp; 733 int err, adjust; 734 735 if (isv4) 736 err = tsol_check_label(cr, &iackmp, &adjust, 737 connp->conn_mac_exempt); 738 else 739 err = tsol_check_label_v6(cr, &iackmp, &adjust, 740 connp->conn_mac_exempt); 741 if (err != 0) { 742 sctp_send_abort(sctp, sctp_init2vtag(ch), 743 SCTP_ERR_AUTH_ERR, NULL, 0, initmp, 0, B_FALSE); 744 freemsg(iackmp); 745 return; 746 } 747 if (isv4) { 748 iackiph = (ipha_t *)iackmp->b_rptr; 749 adjust += ntohs(iackiph->ipha_length); 750 iackiph->ipha_length = htons(adjust); 751 } 752 } 753 754 /* 755 * Stash the conn ptr info. for IP only as e don't have any 756 * cached IRE. 757 */ 758 SCTP_STASH_IPINFO(iackmp, (ire_t *)NULL); 759 760 /* XXX sctp == sctp_g_q, so using its obchunks is valid */ 761 BUMP_LOCAL(sctp->sctp_opkts); 762 BUMP_LOCAL(sctp->sctp_obchunks); 763 764 /* OK to call IP_PUT() here instead of sctp_add_sendq(). */ 765 CONN_INC_REF(sctp->sctp_connp); 766 iackmp->b_flag |= MSGHASREF; 767 IP_PUT(iackmp, sctp->sctp_connp, isv4); 768 } 769 770 void 771 sctp_send_cookie_ack(sctp_t *sctp) 772 { 773 sctp_chunk_hdr_t *cach; 774 mblk_t *camp; 775 776 camp = sctp_make_mp(sctp, NULL, sizeof (*cach)); 777 if (camp == NULL) { 778 /* XXX should abort, but don't have the inmp anymore */ 779 SCTP_KSTAT(sctp_send_cookie_ack_failed); 780 return; 781 } 782 783 cach = (sctp_chunk_hdr_t *)camp->b_wptr; 784 camp->b_wptr = (uchar_t *)(cach + 1); 785 cach->sch_id = CHUNK_COOKIE_ACK; 786 cach->sch_flags = 0; 787 cach->sch_len = htons(sizeof (*cach)); 788 789 sctp_set_iplen(sctp, camp); 790 791 BUMP_LOCAL(sctp->sctp_obchunks); 792 793 sctp_add_sendq(sctp, camp); 794 } 795 796 static int 797 sctp_find_al_ind(sctp_parm_hdr_t *sph, ssize_t len, uint32_t *adaption_code) 798 { 799 800 if (len < sizeof (*sph)) 801 return (-1); 802 while (sph != NULL) { 803 if (sph->sph_type == htons(PARM_ADAPT_LAYER_IND) && 804 ntohs(sph->sph_len) >= (sizeof (*sph) + 805 sizeof (uint32_t))) { 806 *adaption_code = *(uint32_t *)(sph + 1); 807 return (0); 808 } 809 sph = sctp_next_parm(sph, &len); 810 } 811 return (-1); 812 } 813 814 void 815 sctp_send_cookie_echo(sctp_t *sctp, sctp_chunk_hdr_t *iackch, mblk_t *iackmp) 816 { 817 mblk_t *cemp; 818 mblk_t *mp = NULL; 819 mblk_t *head; 820 mblk_t *meta; 821 sctp_faddr_t *fp; 822 sctp_chunk_hdr_t *cech; 823 sctp_init_chunk_t *iack; 824 int32_t cansend; 825 int32_t seglen; 826 size_t ceclen; 827 sctp_parm_hdr_t *cph; 828 sctp_data_hdr_t *sdc; 829 sctp_tf_t *tf; 830 int pad = 0; 831 int hdrlen; 832 mblk_t *errmp = NULL; 833 uint_t sctp_options; 834 int error; 835 uint16_t old_num_str; 836 837 iack = (sctp_init_chunk_t *)(iackch + 1); 838 839 cph = NULL; 840 if (validate_init_params(sctp, iackch, iack, iackmp, &cph, &errmp, 841 &pad, &sctp_options) == 0) { /* result in 'pad' ignored */ 842 BUMP_MIB(&sctp_mib, sctpAborted); 843 sctp_assoc_event(sctp, SCTP_CANT_STR_ASSOC, 0, NULL); 844 sctp_clean_death(sctp, ECONNABORTED); 845 return; 846 } 847 ASSERT(cph != NULL); 848 849 ASSERT(sctp->sctp_cookie_mp == NULL); 850 851 /* Got a cookie to echo back; allocate an mblk */ 852 ceclen = sizeof (*cech) + ntohs(cph->sph_len) - sizeof (*cph); 853 if ((pad = ceclen & (SCTP_ALIGN - 1)) != 0) 854 pad = SCTP_ALIGN - pad; 855 856 if (IPH_HDR_VERSION(iackmp->b_rptr) == IPV4_VERSION) 857 hdrlen = sctp->sctp_hdr_len; 858 else 859 hdrlen = sctp->sctp_hdr6_len; 860 861 cemp = allocb(sctp_wroff_xtra + hdrlen + ceclen + pad, BPRI_MED); 862 if (cemp == NULL) { 863 SCTP_FADDR_TIMER_RESTART(sctp, sctp->sctp_current, 864 sctp->sctp_current->rto); 865 if (errmp != NULL) 866 freeb(errmp); 867 return; 868 } 869 cemp->b_rptr += (sctp_wroff_xtra + hdrlen); 870 871 /* Process the INIT ACK */ 872 sctp->sctp_sctph->sh_verf = iack->sic_inittag; 873 sctp->sctp_sctph6->sh_verf = iack->sic_inittag; 874 sctp->sctp_fvtag = iack->sic_inittag; 875 sctp->sctp_ftsn = ntohl(iack->sic_inittsn); 876 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 877 sctp->sctp_fcsn = sctp->sctp_lastacked; 878 sctp->sctp_frwnd = ntohl(iack->sic_a_rwnd); 879 880 /* 881 * Populate sctp with addresses given in the INIT ACK or IP header. 882 * Need to set the df bit in the current fp as it has been cleared 883 * in sctp_connect(). 884 */ 885 sctp->sctp_current->df = B_TRUE; 886 /* 887 * Since IP uses this info during the fanout process, we need to hold 888 * the lock for this hash line while performing this operation. 889 */ 890 /* XXX sctp_conn_fanout + SCTP_CONN_HASH(sctp->sctp_ports); */ 891 ASSERT(sctp->sctp_conn_tfp != NULL); 892 tf = sctp->sctp_conn_tfp; 893 /* sctp isn't a listener so only need to hold conn fanout lock */ 894 mutex_enter(&tf->tf_lock); 895 if (sctp_get_addrparams(sctp, NULL, iackmp, iackch, NULL) != 0) { 896 mutex_exit(&tf->tf_lock); 897 freeb(cemp); 898 SCTP_FADDR_TIMER_RESTART(sctp, sctp->sctp_current, 899 sctp->sctp_current->rto); 900 if (errmp != NULL) 901 freeb(errmp); 902 return; 903 } 904 mutex_exit(&tf->tf_lock); 905 906 fp = sctp->sctp_current; 907 908 /* 909 * There could be a case when we get an INIT-ACK again, if the INIT 910 * is re-transmitted, for e.g., which means we would have already 911 * allocated this resource earlier (also for sctp_instr). In this 912 * case we check and re-allocate, if necessary. 913 */ 914 old_num_str = sctp->sctp_num_ostr; 915 if (ntohs(iack->sic_instr) < sctp->sctp_num_ostr) 916 sctp->sctp_num_ostr = ntohs(iack->sic_instr); 917 if (sctp->sctp_ostrcntrs == NULL) { 918 sctp->sctp_ostrcntrs = kmem_zalloc(sizeof (uint16_t) * 919 sctp->sctp_num_ostr, KM_NOSLEEP); 920 } else { 921 ASSERT(old_num_str > 0); 922 if (old_num_str != sctp->sctp_num_ostr) { 923 kmem_free(sctp->sctp_ostrcntrs, sizeof (uint16_t) * 924 old_num_str); 925 sctp->sctp_ostrcntrs = kmem_zalloc(sizeof (uint16_t) * 926 sctp->sctp_num_ostr, KM_NOSLEEP); 927 } 928 } 929 if (sctp->sctp_ostrcntrs == NULL) { 930 freeb(cemp); 931 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 932 if (errmp != NULL) 933 freeb(errmp); 934 return; 935 } 936 937 /* 938 * Allocate the in stream tracking array. Comments for sctp_ostrcntrs 939 * hold here too. 940 */ 941 old_num_str = sctp->sctp_num_istr; 942 if (ntohs(iack->sic_outstr) < sctp->sctp_num_istr) 943 sctp->sctp_num_istr = ntohs(iack->sic_outstr); 944 if (sctp->sctp_instr == NULL) { 945 sctp->sctp_instr = kmem_zalloc(sizeof (*sctp->sctp_instr) * 946 sctp->sctp_num_istr, KM_NOSLEEP); 947 } else { 948 ASSERT(old_num_str > 0); 949 if (old_num_str != sctp->sctp_num_istr) { 950 kmem_free(sctp->sctp_instr, 951 sizeof (*sctp->sctp_instr) * old_num_str); 952 sctp->sctp_instr = kmem_zalloc( 953 sizeof (*sctp->sctp_instr) * sctp->sctp_num_istr, 954 KM_NOSLEEP); 955 } 956 } 957 if (sctp->sctp_instr == NULL) { 958 kmem_free(sctp->sctp_ostrcntrs, 959 sizeof (uint16_t) * sctp->sctp_num_ostr); 960 freeb(cemp); 961 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 962 if (errmp != NULL) 963 freeb(errmp); 964 return; 965 } 966 967 if (!(sctp_options & SCTP_PRSCTP_OPTION) && sctp->sctp_prsctp_aware) 968 sctp->sctp_prsctp_aware = B_FALSE; 969 970 if (sctp_find_al_ind((sctp_parm_hdr_t *)(iack + 1), 971 ntohs(iackch->sch_len) - (sizeof (*iackch) + sizeof (*iack)), 972 &sctp->sctp_rx_adaption_code) == 0) { 973 sctp->sctp_recv_adaption = 1; 974 } 975 976 cech = (sctp_chunk_hdr_t *)cemp->b_rptr; 977 ASSERT(OK_32PTR(cech)); 978 cech->sch_id = CHUNK_COOKIE; 979 cech->sch_flags = 0; 980 cech->sch_len = htons(ceclen); 981 982 /* Copy the cookie (less the parm hdr) to the chunk */ 983 bcopy(cph + 1, cech + 1, ceclen - sizeof (*cph)); 984 985 cemp->b_wptr = cemp->b_rptr + ceclen; 986 987 if (sctp->sctp_unsent > 0) { 988 sctp_msg_hdr_t *smh; 989 mblk_t *prev = NULL; 990 uint32_t unsent = 0; 991 992 mp = sctp->sctp_xmit_unsent; 993 do { 994 smh = (sctp_msg_hdr_t *)mp->b_rptr; 995 if (smh->smh_sid >= sctp->sctp_num_ostr) { 996 unsent += smh->smh_msglen; 997 if (prev != NULL) 998 prev->b_next = mp->b_next; 999 else 1000 sctp->sctp_xmit_unsent = mp->b_next; 1001 mp->b_next = NULL; 1002 sctp_sendfail_event(sctp, mp, SCTP_ERR_BAD_SID, 1003 B_FALSE); 1004 if (prev != NULL) 1005 mp = prev->b_next; 1006 else 1007 mp = sctp->sctp_xmit_unsent; 1008 } else { 1009 prev = mp; 1010 mp = mp->b_next; 1011 } 1012 } while (mp != NULL); 1013 if (unsent > 0) { 1014 ASSERT(sctp->sctp_unsent >= unsent); 1015 sctp->sctp_unsent -= unsent; 1016 /* 1017 * Update ULP the amount of queued data, which is 1018 * sent-unack'ed + unsent. 1019 * This is not necessary, but doesn't harm, we 1020 * just use unsent instead of sent-unack'ed + 1021 * unsent, since there won't be any sent-unack'ed 1022 * here. 1023 */ 1024 if (!SCTP_IS_DETACHED(sctp)) { 1025 sctp->sctp_ulp_xmitted(sctp->sctp_ulpd, 1026 sctp->sctp_unsent); 1027 } 1028 } 1029 if (sctp->sctp_xmit_unsent == NULL) 1030 sctp->sctp_xmit_unsent_tail = NULL; 1031 } 1032 ceclen += pad; 1033 cansend = MIN(sctp->sctp_unsent, sctp->sctp_frwnd); 1034 meta = sctp_get_msg_to_send(sctp, &mp, NULL, &error, ceclen, 1035 cansend, NULL); 1036 /* 1037 * The error cannot be anything else since we could have an non-zero 1038 * error only if sctp_get_msg_to_send() tries to send a Forward 1039 * TSN which will not happen here. 1040 */ 1041 ASSERT(error == 0); 1042 if (meta == NULL) 1043 goto sendcookie; 1044 sctp->sctp_xmit_tail = meta; 1045 sdc = (sctp_data_hdr_t *)mp->b_rptr; 1046 seglen = ntohs(sdc->sdh_len); 1047 if ((ceclen + seglen) > fp->sfa_pmss || 1048 (seglen - sizeof (*sdc)) > cansend) { 1049 goto sendcookie; 1050 } 1051 /* OK, if this fails */ 1052 cemp->b_cont = dupmsg(mp); 1053 sendcookie: 1054 head = sctp_add_proto_hdr(sctp, fp, cemp, 0, NULL); 1055 if (head == NULL) { 1056 freemsg(cemp); 1057 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 1058 if (errmp != NULL) 1059 freeb(errmp); 1060 SCTP_KSTAT(sctp_send_cookie_failed); 1061 return; 1062 } 1063 /* 1064 * Even if cookie-echo exceeds MTU for one of the hops, it'll 1065 * have a chance of getting there. 1066 */ 1067 if (fp->isv4) { 1068 ipha_t *iph = (ipha_t *)head->b_rptr; 1069 iph->ipha_fragment_offset_and_flags = 0; 1070 } 1071 BUMP_LOCAL(sctp->sctp_obchunks); 1072 1073 sctp->sctp_cookie_mp = dupmsg(head); 1074 /* Don't bundle, we will just resend init if this cookie is lost. */ 1075 if (sctp->sctp_cookie_mp == NULL) { 1076 if (cemp->b_cont != NULL) { 1077 freemsg(cemp->b_cont); 1078 cemp->b_cont = NULL; 1079 } 1080 } else if (cemp->b_cont != NULL) { 1081 ASSERT(mp != NULL && mp == meta->b_cont); 1082 SCTP_CHUNK_CLEAR_FLAGS(cemp->b_cont); 1083 cemp->b_wptr += pad; 1084 seglen -= sizeof (*sdc); 1085 SCTP_CHUNK_SENT(sctp, mp, sdc, fp, seglen, meta); 1086 } 1087 if (errmp != NULL) 1088 linkb(head, errmp); 1089 sctp->sctp_state = SCTPS_COOKIE_ECHOED; 1090 SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 1091 1092 sctp_set_iplen(sctp, head); 1093 sctp_add_sendq(sctp, head); 1094 } 1095 1096 int 1097 sctp_process_cookie(sctp_t *sctp, sctp_chunk_hdr_t *ch, mblk_t *cmp, 1098 sctp_init_chunk_t **iackpp, sctp_hdr_t *insctph, int *recv_adaption, 1099 in6_addr_t *peer_addr) 1100 { 1101 int32_t clen; 1102 size_t initplen; 1103 uchar_t *p; 1104 uchar_t *given_hash; 1105 uchar_t needed_hash[16]; 1106 int64_t ts; 1107 int64_t diff; 1108 uint32_t *lt; 1109 sctp_init_chunk_t *iack; 1110 sctp_chunk_hdr_t *initch; 1111 sctp_init_chunk_t *init; 1112 uint32_t *lttag; 1113 uint32_t *fttag; 1114 uint32_t ports; 1115 1116 BUMP_LOCAL(sctp->sctp_ibchunks); 1117 /* Verify the ICV */ 1118 clen = ntohs(ch->sch_len) - sizeof (*ch) - 16; 1119 if (clen < 0) { 1120 dprint(1, ("invalid cookie chunk length %d\n", 1121 ntohs(ch->sch_len))); 1122 1123 return (-1); 1124 } 1125 p = (uchar_t *)(ch + 1); 1126 1127 hmac_md5(p, clen, (uchar_t *)sctp->sctp_secret, SCTP_SECRET_LEN, 1128 needed_hash); 1129 1130 /* The given hash follows the cookie data */ 1131 given_hash = p + clen; 1132 1133 if (bcmp(given_hash, needed_hash, 16) != 0) { 1134 /* The secret may have changed; try the old secret */ 1135 hmac_md5(p, clen, (uchar_t *)sctp->sctp_old_secret, 1136 SCTP_SECRET_LEN, needed_hash); 1137 if (bcmp(given_hash, needed_hash, 16) != 0) { 1138 return (-1); 1139 } 1140 } 1141 1142 /* Timestamp is int64_t, and we only guarantee 32-bit alignment */ 1143 bcopy(p, &ts, sizeof (ts)); 1144 /* Cookie life time, int32_t */ 1145 lt = (uint32_t *)(p + sizeof (ts)); 1146 1147 /* 1148 * To quote PRC, "this is our baby", so let's continue. 1149 * We need to pull out the encapsulated INIT ACK and 1150 * INIT chunks. Note that we don't process these until 1151 * we have verified the timestamp, but we need them before 1152 * processing the timestamp since if the time check fails, 1153 * we need to get the verification tag from the INIT in order 1154 * to send a stale cookie error. 1155 */ 1156 lttag = (uint32_t *)(lt + 1); 1157 fttag = lttag + 1; 1158 if (peer_addr != NULL) 1159 bcopy(fttag + 1, peer_addr, sizeof (in6_addr_t)); 1160 iack = (sctp_init_chunk_t *)((char *)(fttag + 1) + sizeof (in6_addr_t)); 1161 initch = (sctp_chunk_hdr_t *)(iack + 1); 1162 init = (sctp_init_chunk_t *)(initch + 1); 1163 initplen = ntohs(initch->sch_len) - (sizeof (*init) + sizeof (*initch)); 1164 *iackpp = iack; 1165 *recv_adaption = 0; 1166 1167 /* Check the timestamp */ 1168 diff = lbolt64 - ts; 1169 if (diff > *lt && (init->sic_inittag != sctp->sctp_fvtag || 1170 iack->sic_inittag != sctp->sctp_lvtag)) { 1171 1172 uint32_t staleness; 1173 1174 staleness = TICK_TO_USEC(diff); 1175 staleness = htonl(staleness); 1176 sctp_send_abort(sctp, init->sic_inittag, SCTP_ERR_STALE_COOKIE, 1177 (char *)&staleness, sizeof (staleness), cmp, 1, B_FALSE); 1178 1179 dprint(1, ("stale cookie %d\n", staleness)); 1180 1181 return (-1); 1182 } 1183 1184 /* Check for attack by adding addresses to a restart */ 1185 bcopy(insctph, &ports, sizeof (ports)); 1186 if (sctp_secure_restart_check(cmp, initch, ports, KM_NOSLEEP) != 1) { 1187 return (-1); 1188 } 1189 1190 /* Look for adaptation code if there any parms in the INIT chunk */ 1191 if ((initplen >= sizeof (sctp_parm_hdr_t)) && 1192 (sctp_find_al_ind((sctp_parm_hdr_t *)(init + 1), initplen, 1193 &sctp->sctp_rx_adaption_code) == 0)) { 1194 *recv_adaption = 1; 1195 } 1196 1197 /* Examine tie-tags */ 1198 1199 if (sctp->sctp_state >= SCTPS_COOKIE_WAIT) { 1200 if (sctp->sctp_state == SCTPS_ESTABLISHED && 1201 init->sic_inittag == sctp->sctp_fvtag && 1202 iack->sic_inittag == sctp->sctp_lvtag && 1203 *fttag == 0 && *lttag == 0) { 1204 1205 dprint(1, ("duplicate cookie from %x:%x:%x:%x (%d)\n", 1206 SCTP_PRINTADDR(sctp->sctp_current->faddr), 1207 (int)(sctp->sctp_fport))); 1208 return (-1); 1209 } 1210 1211 if (init->sic_inittag != sctp->sctp_fvtag && 1212 iack->sic_inittag != sctp->sctp_lvtag && 1213 *fttag == sctp->sctp_fvtag && 1214 *lttag == sctp->sctp_lvtag) { 1215 int i; 1216 1217 /* Section 5.2.4 case A: restart */ 1218 sctp->sctp_fvtag = init->sic_inittag; 1219 sctp->sctp_lvtag = iack->sic_inittag; 1220 1221 sctp->sctp_sctph->sh_verf = init->sic_inittag; 1222 sctp->sctp_sctph6->sh_verf = init->sic_inittag; 1223 1224 sctp->sctp_ftsn = ntohl(init->sic_inittsn); 1225 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 1226 sctp->sctp_frwnd = ntohl(init->sic_a_rwnd); 1227 sctp->sctp_fcsn = sctp->sctp_lastacked; 1228 1229 if (sctp->sctp_state < SCTPS_ESTABLISHED) { 1230 sctp->sctp_state = SCTPS_ESTABLISHED; 1231 sctp->sctp_assoc_start_time = (uint32_t)lbolt; 1232 } 1233 1234 dprint(1, ("sctp peer %x:%x:%x:%x (%d) restarted\n", 1235 SCTP_PRINTADDR(sctp->sctp_current->faddr), 1236 (int)(sctp->sctp_fport))); 1237 /* reset parameters */ 1238 sctp_congest_reset(sctp); 1239 1240 /* reset stream bookkeeping */ 1241 sctp_instream_cleanup(sctp, B_FALSE); 1242 1243 sctp->sctp_istr_nmsgs = 0; 1244 sctp->sctp_rxqueued = 0; 1245 for (i = 0; i < sctp->sctp_num_ostr; i++) { 1246 sctp->sctp_ostrcntrs[i] = 0; 1247 } 1248 /* XXX flush xmit_list? */ 1249 1250 return (0); 1251 } else if (init->sic_inittag != sctp->sctp_fvtag && 1252 iack->sic_inittag == sctp->sctp_lvtag) { 1253 1254 /* Section 5.2.4 case B: INIT collision */ 1255 if (sctp->sctp_state < SCTPS_ESTABLISHED) { 1256 if (!sctp_initialize_params(sctp, init, iack)) 1257 return (-1); /* Drop? */ 1258 sctp->sctp_state = SCTPS_ESTABLISHED; 1259 sctp->sctp_assoc_start_time = (uint32_t)lbolt; 1260 } 1261 1262 dprint(1, ("init collision with %x:%x:%x:%x (%d)\n", 1263 SCTP_PRINTADDR(sctp->sctp_current->faddr), 1264 (int)(sctp->sctp_fport))); 1265 1266 return (0); 1267 } else if (iack->sic_inittag != sctp->sctp_lvtag && 1268 init->sic_inittag == sctp->sctp_fvtag && 1269 *fttag == 0 && *lttag == 0) { 1270 1271 /* Section 5.2.4 case C: late COOKIE */ 1272 dprint(1, ("late cookie from %x:%x:%x:%x (%d)\n", 1273 SCTP_PRINTADDR(sctp->sctp_current->faddr), 1274 (int)(sctp->sctp_fport))); 1275 return (-1); 1276 } else if (init->sic_inittag == sctp->sctp_fvtag && 1277 iack->sic_inittag == sctp->sctp_lvtag) { 1278 1279 /* 1280 * Section 5.2.4 case D: COOKIE ECHO retransmit 1281 * Don't check cookie lifetime 1282 */ 1283 dprint(1, ("cookie tags match from %x:%x:%x:%x (%d)\n", 1284 SCTP_PRINTADDR(sctp->sctp_current->faddr), 1285 (int)(sctp->sctp_fport))); 1286 if (sctp->sctp_state < SCTPS_ESTABLISHED) { 1287 if (!sctp_initialize_params(sctp, init, iack)) 1288 return (-1); /* Drop? */ 1289 sctp->sctp_state = SCTPS_ESTABLISHED; 1290 sctp->sctp_assoc_start_time = (uint32_t)lbolt; 1291 } 1292 return (0); 1293 } else { 1294 /* unrecognized case -- silently drop it */ 1295 return (-1); 1296 } 1297 } 1298 1299 return (0); 1300 } 1301 1302 /* 1303 * Similar to ip_fanout_sctp, except that the src addr(s) are drawn 1304 * from address parameters in an INIT ACK's address list. This 1305 * function is used when an INIT ACK is received but IP's fanout 1306 * function could not find a sctp via the normal lookup routine. 1307 * This can happen when a host sends an INIT ACK from a different 1308 * address than the INIT was sent to. 1309 * 1310 * Returns the sctp_t if found, or NULL if not found. 1311 */ 1312 sctp_t * 1313 sctp_addrlist2sctp(mblk_t *mp, sctp_hdr_t *sctph, sctp_chunk_hdr_t *ich, 1314 uint_t ipif_seqid, zoneid_t zoneid) 1315 { 1316 int isv4; 1317 ipha_t *iph; 1318 ip6_t *ip6h; 1319 in6_addr_t dst; 1320 in6_addr_t src; 1321 sctp_parm_hdr_t *ph; 1322 ssize_t remaining; 1323 sctp_init_chunk_t *iack; 1324 uint32_t ports; 1325 sctp_t *sctp = NULL; 1326 1327 ASSERT(ich->sch_id == CHUNK_INIT_ACK); 1328 1329 isv4 = (IPH_HDR_VERSION(mp->b_rptr) == IPV4_VERSION); 1330 if (isv4) { 1331 iph = (ipha_t *)mp->b_rptr; 1332 IN6_IPADDR_TO_V4MAPPED(iph->ipha_dst, &dst); 1333 } else { 1334 ip6h = (ip6_t *)mp->b_rptr; 1335 dst = ip6h->ip6_dst; 1336 } 1337 1338 ports = *(uint32_t *)sctph; 1339 1340 dprint(1, ("sctp_addrlist2sctp: ports=%u, dst = %x:%x:%x:%x\n", 1341 ports, SCTP_PRINTADDR(dst))); 1342 1343 /* pull out any address parameters */ 1344 remaining = ntohs(ich->sch_len) - sizeof (*ich) - sizeof (*iack); 1345 if (remaining < sizeof (*ph)) { 1346 return (NULL); 1347 } 1348 1349 iack = (sctp_init_chunk_t *)(ich + 1); 1350 ph = (sctp_parm_hdr_t *)(iack + 1); 1351 1352 while (ph != NULL) { 1353 /* 1354 * params have been put in host byteorder by 1355 * sctp_check_input() 1356 */ 1357 if (ph->sph_type == PARM_ADDR4) { 1358 IN6_INADDR_TO_V4MAPPED((struct in_addr *)(ph + 1), 1359 &src); 1360 1361 sctp = sctp_conn_match(&src, &dst, ports, ipif_seqid, 1362 zoneid); 1363 1364 dprint(1, 1365 ("sctp_addrlist2sctp: src=%x:%x:%x:%x, sctp=%p\n", 1366 SCTP_PRINTADDR(src), (void *)sctp)); 1367 1368 1369 if (sctp != NULL) { 1370 return (sctp); 1371 } 1372 } else if (ph->sph_type == PARM_ADDR6) { 1373 src = *(in6_addr_t *)(ph + 1); 1374 sctp = sctp_conn_match(&src, &dst, ports, ipif_seqid, 1375 zoneid); 1376 1377 dprint(1, 1378 ("sctp_addrlist2sctp: src=%x:%x:%x:%x, sctp=%p\n", 1379 SCTP_PRINTADDR(src), (void *)sctp)); 1380 1381 if (sctp != NULL) { 1382 return (sctp); 1383 } 1384 } 1385 1386 ph = sctp_next_parm(ph, &remaining); 1387 } 1388 1389 return (NULL); 1390 } 1391