1 /*- 2 * Copyright (c) 2012 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Edward Tomasz Napierala under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 /* 33 * iSCSI Common Layer. It's used by both the initiator and target to send 34 * and receive iSCSI PDUs. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/capsicum.h> 39 #include <sys/condvar.h> 40 #include <sys/conf.h> 41 #include <sys/file.h> 42 #include <sys/kernel.h> 43 #include <sys/kthread.h> 44 #include <sys/lock.h> 45 #include <sys/mbuf.h> 46 #include <sys/mutex.h> 47 #include <sys/module.h> 48 #include <sys/protosw.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/sysctl.h> 52 #include <sys/systm.h> 53 #include <sys/sx.h> 54 #include <sys/uio.h> 55 #include <vm/uma.h> 56 #include <netinet/in.h> 57 #include <netinet/tcp.h> 58 59 #include "icl.h" 60 #include "iscsi_proto.h" 61 62 SYSCTL_NODE(_kern, OID_AUTO, icl, CTLFLAG_RD, 0, "iSCSI Common Layer"); 63 static int debug = 1; 64 SYSCTL_INT(_kern_icl, OID_AUTO, debug, CTLFLAG_RWTUN, 65 &debug, 0, "Enable debug messages"); 66 static int coalesce = 1; 67 SYSCTL_INT(_kern_icl, OID_AUTO, coalesce, CTLFLAG_RWTUN, 68 &coalesce, 0, "Try to coalesce PDUs before sending"); 69 static int partial_receive_len = 128 * 1024; 70 SYSCTL_INT(_kern_icl, OID_AUTO, partial_receive_len, CTLFLAG_RWTUN, 71 &partial_receive_len, 0, "Minimum read size for partially received " 72 "data segment"); 73 static int sendspace = 1048576; 74 SYSCTL_INT(_kern_icl, OID_AUTO, sendspace, CTLFLAG_RWTUN, 75 &sendspace, 0, "Default send socket buffer size"); 76 static int recvspace = 1048576; 77 SYSCTL_INT(_kern_icl, OID_AUTO, recvspace, CTLFLAG_RWTUN, 78 &recvspace, 0, "Default receive socket buffer size"); 79 80 static uma_zone_t icl_conn_zone; 81 static uma_zone_t icl_pdu_zone; 82 83 static volatile u_int icl_ncons; 84 85 #define ICL_DEBUG(X, ...) \ 86 do { \ 87 if (debug > 1) \ 88 printf("%s: " X "\n", __func__, ## __VA_ARGS__);\ 89 } while (0) 90 91 #define ICL_WARN(X, ...) \ 92 do { \ 93 if (debug > 0) { \ 94 printf("WARNING: %s: " X "\n", \ 95 __func__, ## __VA_ARGS__); \ 96 } \ 97 } while (0) 98 99 #define ICL_CONN_LOCK(X) mtx_lock(X->ic_lock) 100 #define ICL_CONN_UNLOCK(X) mtx_unlock(X->ic_lock) 101 #define ICL_CONN_LOCK_ASSERT(X) mtx_assert(X->ic_lock, MA_OWNED) 102 #define ICL_CONN_LOCK_ASSERT_NOT(X) mtx_assert(X->ic_lock, MA_NOTOWNED) 103 104 STAILQ_HEAD(icl_pdu_stailq, icl_pdu); 105 106 static void 107 icl_conn_fail(struct icl_conn *ic) 108 { 109 if (ic->ic_socket == NULL) 110 return; 111 112 /* 113 * XXX 114 */ 115 ic->ic_socket->so_error = EDOOFUS; 116 (ic->ic_error)(ic); 117 } 118 119 static struct mbuf * 120 icl_conn_receive(struct icl_conn *ic, size_t len) 121 { 122 struct uio uio; 123 struct socket *so; 124 struct mbuf *m; 125 int error, flags; 126 127 so = ic->ic_socket; 128 129 memset(&uio, 0, sizeof(uio)); 130 uio.uio_resid = len; 131 132 flags = MSG_DONTWAIT; 133 error = soreceive(so, NULL, &uio, &m, NULL, &flags); 134 if (error != 0) { 135 ICL_DEBUG("soreceive error %d", error); 136 return (NULL); 137 } 138 if (uio.uio_resid != 0) { 139 m_freem(m); 140 ICL_DEBUG("short read"); 141 return (NULL); 142 } 143 144 return (m); 145 } 146 147 static struct icl_pdu * 148 icl_pdu_new(struct icl_conn *ic, int flags) 149 { 150 struct icl_pdu *ip; 151 152 #ifdef DIAGNOSTIC 153 refcount_acquire(&ic->ic_outstanding_pdus); 154 #endif 155 ip = uma_zalloc(icl_pdu_zone, flags | M_ZERO); 156 if (ip == NULL) { 157 ICL_WARN("failed to allocate %zd bytes", sizeof(*ip)); 158 #ifdef DIAGNOSTIC 159 refcount_release(&ic->ic_outstanding_pdus); 160 #endif 161 return (NULL); 162 } 163 164 ip->ip_conn = ic; 165 166 return (ip); 167 } 168 169 void 170 icl_pdu_free(struct icl_pdu *ip) 171 { 172 struct icl_conn *ic; 173 174 ic = ip->ip_conn; 175 176 m_freem(ip->ip_bhs_mbuf); 177 m_freem(ip->ip_ahs_mbuf); 178 m_freem(ip->ip_data_mbuf); 179 uma_zfree(icl_pdu_zone, ip); 180 #ifdef DIAGNOSTIC 181 refcount_release(&ic->ic_outstanding_pdus); 182 #endif 183 } 184 185 /* 186 * Allocate icl_pdu with empty BHS to fill up by the caller. 187 */ 188 struct icl_pdu * 189 icl_pdu_new_bhs(struct icl_conn *ic, int flags) 190 { 191 struct icl_pdu *ip; 192 193 ip = icl_pdu_new(ic, flags); 194 if (ip == NULL) 195 return (NULL); 196 197 ip->ip_bhs_mbuf = m_getm2(NULL, sizeof(struct iscsi_bhs), 198 flags, MT_DATA, M_PKTHDR); 199 if (ip->ip_bhs_mbuf == NULL) { 200 ICL_WARN("failed to allocate %zd bytes", sizeof(*ip)); 201 icl_pdu_free(ip); 202 return (NULL); 203 } 204 ip->ip_bhs = mtod(ip->ip_bhs_mbuf, struct iscsi_bhs *); 205 memset(ip->ip_bhs, 0, sizeof(struct iscsi_bhs)); 206 ip->ip_bhs_mbuf->m_len = sizeof(struct iscsi_bhs); 207 208 return (ip); 209 } 210 211 static int 212 icl_pdu_ahs_length(const struct icl_pdu *request) 213 { 214 215 return (request->ip_bhs->bhs_total_ahs_len * 4); 216 } 217 218 size_t 219 icl_pdu_data_segment_length(const struct icl_pdu *request) 220 { 221 uint32_t len = 0; 222 223 len += request->ip_bhs->bhs_data_segment_len[0]; 224 len <<= 8; 225 len += request->ip_bhs->bhs_data_segment_len[1]; 226 len <<= 8; 227 len += request->ip_bhs->bhs_data_segment_len[2]; 228 229 return (len); 230 } 231 232 static void 233 icl_pdu_set_data_segment_length(struct icl_pdu *response, uint32_t len) 234 { 235 236 response->ip_bhs->bhs_data_segment_len[2] = len; 237 response->ip_bhs->bhs_data_segment_len[1] = len >> 8; 238 response->ip_bhs->bhs_data_segment_len[0] = len >> 16; 239 } 240 241 static size_t 242 icl_pdu_padding(const struct icl_pdu *ip) 243 { 244 245 if ((ip->ip_data_len % 4) != 0) 246 return (4 - (ip->ip_data_len % 4)); 247 248 return (0); 249 } 250 251 static size_t 252 icl_pdu_size(const struct icl_pdu *response) 253 { 254 size_t len; 255 256 KASSERT(response->ip_ahs_len == 0, ("responding with AHS")); 257 258 len = sizeof(struct iscsi_bhs) + response->ip_data_len + 259 icl_pdu_padding(response); 260 if (response->ip_conn->ic_header_crc32c) 261 len += ISCSI_HEADER_DIGEST_SIZE; 262 if (response->ip_data_len != 0 && response->ip_conn->ic_data_crc32c) 263 len += ISCSI_DATA_DIGEST_SIZE; 264 265 return (len); 266 } 267 268 static int 269 icl_pdu_receive_bhs(struct icl_pdu *request, size_t *availablep) 270 { 271 struct mbuf *m; 272 273 m = icl_conn_receive(request->ip_conn, sizeof(struct iscsi_bhs)); 274 if (m == NULL) { 275 ICL_DEBUG("failed to receive BHS"); 276 return (-1); 277 } 278 279 request->ip_bhs_mbuf = m_pullup(m, sizeof(struct iscsi_bhs)); 280 if (request->ip_bhs_mbuf == NULL) { 281 ICL_WARN("m_pullup failed"); 282 return (-1); 283 } 284 request->ip_bhs = mtod(request->ip_bhs_mbuf, struct iscsi_bhs *); 285 286 /* 287 * XXX: For architectures with strict alignment requirements 288 * we may need to allocate ip_bhs and copy the data into it. 289 * For some reason, though, not doing this doesn't seem 290 * to cause problems; tested on sparc64. 291 */ 292 293 *availablep -= sizeof(struct iscsi_bhs); 294 return (0); 295 } 296 297 static int 298 icl_pdu_receive_ahs(struct icl_pdu *request, size_t *availablep) 299 { 300 301 request->ip_ahs_len = icl_pdu_ahs_length(request); 302 if (request->ip_ahs_len == 0) 303 return (0); 304 305 request->ip_ahs_mbuf = icl_conn_receive(request->ip_conn, 306 request->ip_ahs_len); 307 if (request->ip_ahs_mbuf == NULL) { 308 ICL_DEBUG("failed to receive AHS"); 309 return (-1); 310 } 311 312 *availablep -= request->ip_ahs_len; 313 return (0); 314 } 315 316 static uint32_t 317 icl_mbuf_to_crc32c(const struct mbuf *m0) 318 { 319 uint32_t digest = 0xffffffff; 320 const struct mbuf *m; 321 322 for (m = m0; m != NULL; m = m->m_next) 323 digest = calculate_crc32c(digest, 324 mtod(m, const void *), m->m_len); 325 326 digest = digest ^ 0xffffffff; 327 328 return (digest); 329 } 330 331 static int 332 icl_pdu_check_header_digest(struct icl_pdu *request, size_t *availablep) 333 { 334 struct mbuf *m; 335 uint32_t received_digest, valid_digest; 336 337 if (request->ip_conn->ic_header_crc32c == false) 338 return (0); 339 340 m = icl_conn_receive(request->ip_conn, ISCSI_HEADER_DIGEST_SIZE); 341 if (m == NULL) { 342 ICL_DEBUG("failed to receive header digest"); 343 return (-1); 344 } 345 346 CTASSERT(sizeof(received_digest) == ISCSI_HEADER_DIGEST_SIZE); 347 m_copydata(m, 0, ISCSI_HEADER_DIGEST_SIZE, (void *)&received_digest); 348 m_freem(m); 349 350 *availablep -= ISCSI_HEADER_DIGEST_SIZE; 351 352 /* 353 * XXX: Handle AHS. 354 */ 355 valid_digest = icl_mbuf_to_crc32c(request->ip_bhs_mbuf); 356 if (received_digest != valid_digest) { 357 ICL_WARN("header digest check failed; got 0x%x, " 358 "should be 0x%x", received_digest, valid_digest); 359 return (-1); 360 } 361 362 return (0); 363 } 364 365 /* 366 * Return the number of bytes that should be waiting in the receive socket 367 * before icl_pdu_receive_data_segment() gets called. 368 */ 369 static size_t 370 icl_pdu_data_segment_receive_len(const struct icl_pdu *request) 371 { 372 size_t len; 373 374 len = icl_pdu_data_segment_length(request); 375 if (len == 0) 376 return (0); 377 378 /* 379 * Account for the parts of data segment already read from 380 * the socket buffer. 381 */ 382 KASSERT(len > request->ip_data_len, ("len <= request->ip_data_len")); 383 len -= request->ip_data_len; 384 385 /* 386 * Don't always wait for the full data segment to be delivered 387 * to the socket; this might badly affect performance due to 388 * TCP window scaling. 389 */ 390 if (len > partial_receive_len) { 391 #if 0 392 ICL_DEBUG("need %zd bytes of data, limiting to %zd", 393 len, partial_receive_len)); 394 #endif 395 len = partial_receive_len; 396 397 return (len); 398 } 399 400 /* 401 * Account for padding. Note that due to the way code is written, 402 * the icl_pdu_receive_data_segment() must always receive padding 403 * along with the last part of data segment, because it would be 404 * impossible to tell whether we've already received the full data 405 * segment including padding, or without it. 406 */ 407 if ((len % 4) != 0) 408 len += 4 - (len % 4); 409 410 #if 0 411 ICL_DEBUG("need %zd bytes of data", len)); 412 #endif 413 414 return (len); 415 } 416 417 static int 418 icl_pdu_receive_data_segment(struct icl_pdu *request, 419 size_t *availablep, bool *more_neededp) 420 { 421 struct icl_conn *ic; 422 size_t len, padding = 0; 423 struct mbuf *m; 424 425 ic = request->ip_conn; 426 427 *more_neededp = false; 428 ic->ic_receive_len = 0; 429 430 len = icl_pdu_data_segment_length(request); 431 if (len == 0) 432 return (0); 433 434 if ((len % 4) != 0) 435 padding = 4 - (len % 4); 436 437 /* 438 * Account for already received parts of data segment. 439 */ 440 KASSERT(len > request->ip_data_len, ("len <= request->ip_data_len")); 441 len -= request->ip_data_len; 442 443 if (len + padding > *availablep) { 444 /* 445 * Not enough data in the socket buffer. Receive as much 446 * as we can. Don't receive padding, since, obviously, it's 447 * not the end of data segment yet. 448 */ 449 #if 0 450 ICL_DEBUG("limited from %zd to %zd", 451 len + padding, *availablep - padding)); 452 #endif 453 len = *availablep - padding; 454 *more_neededp = true; 455 padding = 0; 456 } 457 458 /* 459 * Must not try to receive padding without at least one byte 460 * of actual data segment. 461 */ 462 if (len > 0) { 463 m = icl_conn_receive(request->ip_conn, len + padding); 464 if (m == NULL) { 465 ICL_DEBUG("failed to receive data segment"); 466 return (-1); 467 } 468 469 if (request->ip_data_mbuf == NULL) 470 request->ip_data_mbuf = m; 471 else 472 m_cat(request->ip_data_mbuf, m); 473 474 request->ip_data_len += len; 475 *availablep -= len + padding; 476 } else 477 ICL_DEBUG("len 0"); 478 479 if (*more_neededp) 480 ic->ic_receive_len = 481 icl_pdu_data_segment_receive_len(request); 482 483 return (0); 484 } 485 486 static int 487 icl_pdu_check_data_digest(struct icl_pdu *request, size_t *availablep) 488 { 489 struct mbuf *m; 490 uint32_t received_digest, valid_digest; 491 492 if (request->ip_conn->ic_data_crc32c == false) 493 return (0); 494 495 if (request->ip_data_len == 0) 496 return (0); 497 498 m = icl_conn_receive(request->ip_conn, ISCSI_DATA_DIGEST_SIZE); 499 if (m == NULL) { 500 ICL_DEBUG("failed to receive data digest"); 501 return (-1); 502 } 503 504 CTASSERT(sizeof(received_digest) == ISCSI_DATA_DIGEST_SIZE); 505 m_copydata(m, 0, ISCSI_DATA_DIGEST_SIZE, (void *)&received_digest); 506 m_freem(m); 507 508 *availablep -= ISCSI_DATA_DIGEST_SIZE; 509 510 /* 511 * Note that ip_data_mbuf also contains padding; since digest 512 * calculation is supposed to include that, we iterate over 513 * the entire ip_data_mbuf chain, not just ip_data_len bytes of it. 514 */ 515 valid_digest = icl_mbuf_to_crc32c(request->ip_data_mbuf); 516 if (received_digest != valid_digest) { 517 ICL_WARN("data digest check failed; got 0x%x, " 518 "should be 0x%x", received_digest, valid_digest); 519 return (-1); 520 } 521 522 return (0); 523 } 524 525 /* 526 * Somewhat contrary to the name, this attempts to receive only one 527 * "part" of PDU at a time; call it repeatedly until it returns non-NULL. 528 */ 529 static struct icl_pdu * 530 icl_conn_receive_pdu(struct icl_conn *ic, size_t *availablep) 531 { 532 struct icl_pdu *request; 533 struct socket *so; 534 size_t len; 535 int error; 536 bool more_needed; 537 538 so = ic->ic_socket; 539 540 if (ic->ic_receive_state == ICL_CONN_STATE_BHS) { 541 KASSERT(ic->ic_receive_pdu == NULL, 542 ("ic->ic_receive_pdu != NULL")); 543 request = icl_pdu_new(ic, M_NOWAIT); 544 if (request == NULL) { 545 ICL_DEBUG("failed to allocate PDU; " 546 "dropping connection"); 547 icl_conn_fail(ic); 548 return (NULL); 549 } 550 ic->ic_receive_pdu = request; 551 } else { 552 KASSERT(ic->ic_receive_pdu != NULL, 553 ("ic->ic_receive_pdu == NULL")); 554 request = ic->ic_receive_pdu; 555 } 556 557 if (*availablep < ic->ic_receive_len) { 558 #if 0 559 ICL_DEBUG("not enough data; need %zd, " 560 "have %zd", ic->ic_receive_len, *availablep); 561 #endif 562 return (NULL); 563 } 564 565 switch (ic->ic_receive_state) { 566 case ICL_CONN_STATE_BHS: 567 //ICL_DEBUG("receiving BHS"); 568 error = icl_pdu_receive_bhs(request, availablep); 569 if (error != 0) { 570 ICL_DEBUG("failed to receive BHS; " 571 "dropping connection"); 572 break; 573 } 574 575 /* 576 * We don't enforce any limit for AHS length; 577 * its length is stored in 8 bit field. 578 */ 579 580 len = icl_pdu_data_segment_length(request); 581 if (len > ic->ic_max_data_segment_length) { 582 ICL_WARN("received data segment " 583 "length %zd is larger than negotiated " 584 "MaxDataSegmentLength %zd; " 585 "dropping connection", 586 len, ic->ic_max_data_segment_length); 587 error = EINVAL; 588 break; 589 } 590 591 ic->ic_receive_state = ICL_CONN_STATE_AHS; 592 ic->ic_receive_len = icl_pdu_ahs_length(request); 593 break; 594 595 case ICL_CONN_STATE_AHS: 596 //ICL_DEBUG("receiving AHS"); 597 error = icl_pdu_receive_ahs(request, availablep); 598 if (error != 0) { 599 ICL_DEBUG("failed to receive AHS; " 600 "dropping connection"); 601 break; 602 } 603 ic->ic_receive_state = ICL_CONN_STATE_HEADER_DIGEST; 604 if (ic->ic_header_crc32c == false) 605 ic->ic_receive_len = 0; 606 else 607 ic->ic_receive_len = ISCSI_HEADER_DIGEST_SIZE; 608 break; 609 610 case ICL_CONN_STATE_HEADER_DIGEST: 611 //ICL_DEBUG("receiving header digest"); 612 error = icl_pdu_check_header_digest(request, availablep); 613 if (error != 0) { 614 ICL_DEBUG("header digest failed; " 615 "dropping connection"); 616 break; 617 } 618 619 ic->ic_receive_state = ICL_CONN_STATE_DATA; 620 ic->ic_receive_len = 621 icl_pdu_data_segment_receive_len(request); 622 break; 623 624 case ICL_CONN_STATE_DATA: 625 //ICL_DEBUG("receiving data segment"); 626 error = icl_pdu_receive_data_segment(request, availablep, 627 &more_needed); 628 if (error != 0) { 629 ICL_DEBUG("failed to receive data segment;" 630 "dropping connection"); 631 break; 632 } 633 634 if (more_needed) 635 break; 636 637 ic->ic_receive_state = ICL_CONN_STATE_DATA_DIGEST; 638 if (request->ip_data_len == 0 || ic->ic_data_crc32c == false) 639 ic->ic_receive_len = 0; 640 else 641 ic->ic_receive_len = ISCSI_DATA_DIGEST_SIZE; 642 break; 643 644 case ICL_CONN_STATE_DATA_DIGEST: 645 //ICL_DEBUG("receiving data digest"); 646 error = icl_pdu_check_data_digest(request, availablep); 647 if (error != 0) { 648 ICL_DEBUG("data digest failed; " 649 "dropping connection"); 650 break; 651 } 652 653 /* 654 * We've received complete PDU; reset the receive state machine 655 * and return the PDU. 656 */ 657 ic->ic_receive_state = ICL_CONN_STATE_BHS; 658 ic->ic_receive_len = sizeof(struct iscsi_bhs); 659 ic->ic_receive_pdu = NULL; 660 return (request); 661 662 default: 663 panic("invalid ic_receive_state %d\n", ic->ic_receive_state); 664 } 665 666 if (error != 0) { 667 icl_pdu_free(request); 668 icl_conn_fail(ic); 669 } 670 671 return (NULL); 672 } 673 674 static void 675 icl_conn_receive_pdus(struct icl_conn *ic, size_t available) 676 { 677 struct icl_pdu *response; 678 struct socket *so; 679 680 so = ic->ic_socket; 681 682 /* 683 * This can never happen; we're careful to only mess with ic->ic_socket 684 * pointer when the send/receive threads are not running. 685 */ 686 KASSERT(so != NULL, ("NULL socket")); 687 688 for (;;) { 689 if (ic->ic_disconnecting) 690 return; 691 692 if (so->so_error != 0) { 693 ICL_DEBUG("connection error %d; " 694 "dropping connection", so->so_error); 695 icl_conn_fail(ic); 696 return; 697 } 698 699 /* 700 * Loop until we have a complete PDU or there is not enough 701 * data in the socket buffer. 702 */ 703 if (available < ic->ic_receive_len) { 704 #if 0 705 ICL_DEBUG("not enough data; have %zd, " 706 "need %zd", available, 707 ic->ic_receive_len); 708 #endif 709 return; 710 } 711 712 response = icl_conn_receive_pdu(ic, &available); 713 if (response == NULL) 714 continue; 715 716 if (response->ip_ahs_len > 0) { 717 ICL_WARN("received PDU with unsupported " 718 "AHS; opcode 0x%x; dropping connection", 719 response->ip_bhs->bhs_opcode); 720 icl_pdu_free(response); 721 icl_conn_fail(ic); 722 return; 723 } 724 725 (ic->ic_receive)(response); 726 } 727 } 728 729 static void 730 icl_receive_thread(void *arg) 731 { 732 struct icl_conn *ic; 733 size_t available; 734 struct socket *so; 735 736 ic = arg; 737 so = ic->ic_socket; 738 739 ICL_CONN_LOCK(ic); 740 ic->ic_receive_running = true; 741 ICL_CONN_UNLOCK(ic); 742 743 for (;;) { 744 if (ic->ic_disconnecting) { 745 //ICL_DEBUG("terminating"); 746 break; 747 } 748 749 /* 750 * Set the low watermark, to be checked by 751 * soreadable() in icl_soupcall_receive() 752 * to avoid unneccessary wakeups until there 753 * is enough data received to read the PDU. 754 */ 755 SOCKBUF_LOCK(&so->so_rcv); 756 available = so->so_rcv.sb_cc; 757 if (available < ic->ic_receive_len) { 758 so->so_rcv.sb_lowat = ic->ic_receive_len; 759 cv_wait(&ic->ic_receive_cv, &so->so_rcv.sb_mtx); 760 } else 761 so->so_rcv.sb_lowat = so->so_rcv.sb_hiwat + 1; 762 SOCKBUF_UNLOCK(&so->so_rcv); 763 764 icl_conn_receive_pdus(ic, available); 765 } 766 767 ICL_CONN_LOCK(ic); 768 ic->ic_receive_running = false; 769 ICL_CONN_UNLOCK(ic); 770 kthread_exit(); 771 } 772 773 static int 774 icl_soupcall_receive(struct socket *so, void *arg, int waitflag) 775 { 776 struct icl_conn *ic; 777 778 if (!soreadable(so)) 779 return (SU_OK); 780 781 ic = arg; 782 cv_signal(&ic->ic_receive_cv); 783 return (SU_OK); 784 } 785 786 static int 787 icl_pdu_finalize(struct icl_pdu *request) 788 { 789 size_t padding, pdu_len; 790 uint32_t digest, zero = 0; 791 int ok; 792 struct icl_conn *ic; 793 794 ic = request->ip_conn; 795 796 icl_pdu_set_data_segment_length(request, request->ip_data_len); 797 798 pdu_len = icl_pdu_size(request); 799 800 if (ic->ic_header_crc32c) { 801 digest = icl_mbuf_to_crc32c(request->ip_bhs_mbuf); 802 ok = m_append(request->ip_bhs_mbuf, sizeof(digest), 803 (void *)&digest); 804 if (ok != 1) { 805 ICL_WARN("failed to append header digest"); 806 return (1); 807 } 808 } 809 810 if (request->ip_data_len != 0) { 811 padding = icl_pdu_padding(request); 812 if (padding > 0) { 813 ok = m_append(request->ip_data_mbuf, padding, 814 (void *)&zero); 815 if (ok != 1) { 816 ICL_WARN("failed to append padding"); 817 return (1); 818 } 819 } 820 821 if (ic->ic_data_crc32c) { 822 digest = icl_mbuf_to_crc32c(request->ip_data_mbuf); 823 824 ok = m_append(request->ip_data_mbuf, sizeof(digest), 825 (void *)&digest); 826 if (ok != 1) { 827 ICL_WARN("failed to append data digest"); 828 return (1); 829 } 830 } 831 832 m_cat(request->ip_bhs_mbuf, request->ip_data_mbuf); 833 request->ip_data_mbuf = NULL; 834 } 835 836 request->ip_bhs_mbuf->m_pkthdr.len = pdu_len; 837 838 return (0); 839 } 840 841 static void 842 icl_conn_send_pdus(struct icl_conn *ic, struct icl_pdu_stailq *queue) 843 { 844 struct icl_pdu *request, *request2; 845 struct socket *so; 846 size_t available, size, size2; 847 int coalesced, error; 848 849 ICL_CONN_LOCK_ASSERT_NOT(ic); 850 851 so = ic->ic_socket; 852 853 SOCKBUF_LOCK(&so->so_snd); 854 /* 855 * Check how much space do we have for transmit. We can't just 856 * call sosend() and retry when we get EWOULDBLOCK or EMSGSIZE, 857 * as it always frees the mbuf chain passed to it, even in case 858 * of error. 859 */ 860 available = sbspace(&so->so_snd); 861 862 /* 863 * Notify the socket upcall that we don't need wakeups 864 * for the time being. 865 */ 866 so->so_snd.sb_lowat = so->so_snd.sb_hiwat + 1; 867 SOCKBUF_UNLOCK(&so->so_snd); 868 869 while (!STAILQ_EMPTY(queue)) { 870 if (ic->ic_disconnecting) 871 return; 872 request = STAILQ_FIRST(queue); 873 size = icl_pdu_size(request); 874 if (available < size) { 875 876 /* 877 * Set the low watermark, to be checked by 878 * sowriteable() in icl_soupcall_send() 879 * to avoid unneccessary wakeups until there 880 * is enough space for the PDU to fit. 881 */ 882 SOCKBUF_LOCK(&so->so_snd); 883 available = sbspace(&so->so_snd); 884 if (available < size) { 885 #if 1 886 ICL_DEBUG("no space to send; " 887 "have %zd, need %zd", 888 available, size); 889 #endif 890 so->so_snd.sb_lowat = size; 891 SOCKBUF_UNLOCK(&so->so_snd); 892 return; 893 } 894 SOCKBUF_UNLOCK(&so->so_snd); 895 } 896 STAILQ_REMOVE_HEAD(queue, ip_next); 897 error = icl_pdu_finalize(request); 898 if (error != 0) { 899 ICL_DEBUG("failed to finalize PDU; " 900 "dropping connection"); 901 icl_conn_fail(ic); 902 icl_pdu_free(request); 903 return; 904 } 905 if (coalesce) { 906 coalesced = 1; 907 for (;;) { 908 request2 = STAILQ_FIRST(queue); 909 if (request2 == NULL) 910 break; 911 size2 = icl_pdu_size(request2); 912 if (available < size + size2) 913 break; 914 STAILQ_REMOVE_HEAD(queue, ip_next); 915 error = icl_pdu_finalize(request2); 916 if (error != 0) { 917 ICL_DEBUG("failed to finalize PDU; " 918 "dropping connection"); 919 icl_conn_fail(ic); 920 icl_pdu_free(request); 921 icl_pdu_free(request2); 922 return; 923 } 924 m_cat(request->ip_bhs_mbuf, request2->ip_bhs_mbuf); 925 request2->ip_bhs_mbuf = NULL; 926 request->ip_bhs_mbuf->m_pkthdr.len += size2; 927 size += size2; 928 STAILQ_REMOVE_AFTER(queue, request, ip_next); 929 icl_pdu_free(request2); 930 coalesced++; 931 } 932 #if 0 933 if (coalesced > 1) { 934 ICL_DEBUG("coalesced %d PDUs into %zd bytes", 935 coalesced, size); 936 } 937 #endif 938 } 939 available -= size; 940 error = sosend(so, NULL, NULL, request->ip_bhs_mbuf, 941 NULL, MSG_DONTWAIT, curthread); 942 request->ip_bhs_mbuf = NULL; /* Sosend consumes the mbuf. */ 943 if (error != 0) { 944 ICL_DEBUG("failed to send PDU, error %d; " 945 "dropping connection", error); 946 icl_conn_fail(ic); 947 icl_pdu_free(request); 948 return; 949 } 950 icl_pdu_free(request); 951 } 952 } 953 954 static void 955 icl_send_thread(void *arg) 956 { 957 struct icl_conn *ic; 958 struct icl_pdu_stailq queue; 959 960 ic = arg; 961 962 STAILQ_INIT(&queue); 963 964 ICL_CONN_LOCK(ic); 965 ic->ic_send_running = true; 966 967 for (;;) { 968 if (ic->ic_disconnecting) { 969 //ICL_DEBUG("terminating"); 970 break; 971 } 972 973 for (;;) { 974 /* 975 * If the local queue is empty, populate it from 976 * the main one. This way the icl_conn_send_pdus() 977 * can go through all the queued PDUs without holding 978 * any locks. 979 */ 980 if (STAILQ_EMPTY(&queue)) 981 STAILQ_SWAP(&ic->ic_to_send, &queue, icl_pdu); 982 983 ic->ic_check_send_space = false; 984 ICL_CONN_UNLOCK(ic); 985 icl_conn_send_pdus(ic, &queue); 986 ICL_CONN_LOCK(ic); 987 988 /* 989 * The icl_soupcall_send() was called since the last 990 * call to sbspace(); go around; 991 */ 992 if (ic->ic_check_send_space) 993 continue; 994 995 /* 996 * Local queue is empty, but we still have PDUs 997 * in the main one; go around. 998 */ 999 if (STAILQ_EMPTY(&queue) && 1000 !STAILQ_EMPTY(&ic->ic_to_send)) 1001 continue; 1002 1003 /* 1004 * There might be some stuff in the local queue, 1005 * which didn't get sent due to not having enough send 1006 * space. Wait for socket upcall. 1007 */ 1008 break; 1009 } 1010 1011 cv_wait(&ic->ic_send_cv, ic->ic_lock); 1012 } 1013 1014 /* 1015 * We're exiting; move PDUs back to the main queue, so they can 1016 * get freed properly. At this point ordering doesn't matter. 1017 */ 1018 STAILQ_CONCAT(&ic->ic_to_send, &queue); 1019 1020 ic->ic_send_running = false; 1021 ICL_CONN_UNLOCK(ic); 1022 kthread_exit(); 1023 } 1024 1025 static int 1026 icl_soupcall_send(struct socket *so, void *arg, int waitflag) 1027 { 1028 struct icl_conn *ic; 1029 1030 if (!sowriteable(so)) 1031 return (SU_OK); 1032 1033 ic = arg; 1034 1035 ICL_CONN_LOCK(ic); 1036 ic->ic_check_send_space = true; 1037 ICL_CONN_UNLOCK(ic); 1038 1039 cv_signal(&ic->ic_send_cv); 1040 1041 return (SU_OK); 1042 } 1043 1044 int 1045 icl_pdu_append_data(struct icl_pdu *request, const void *addr, size_t len, 1046 int flags) 1047 { 1048 struct mbuf *mb, *newmb; 1049 size_t copylen, off = 0; 1050 1051 KASSERT(len > 0, ("len == 0")); 1052 1053 newmb = m_getm2(NULL, len, flags, MT_DATA, M_PKTHDR); 1054 if (newmb == NULL) { 1055 ICL_WARN("failed to allocate mbuf for %zd bytes", len); 1056 return (ENOMEM); 1057 } 1058 1059 for (mb = newmb; mb != NULL; mb = mb->m_next) { 1060 copylen = min(M_TRAILINGSPACE(mb), len - off); 1061 memcpy(mtod(mb, char *), (const char *)addr + off, copylen); 1062 mb->m_len = copylen; 1063 off += copylen; 1064 } 1065 KASSERT(off == len, ("%s: off != len", __func__)); 1066 1067 if (request->ip_data_mbuf == NULL) { 1068 request->ip_data_mbuf = newmb; 1069 request->ip_data_len = len; 1070 } else { 1071 m_cat(request->ip_data_mbuf, newmb); 1072 request->ip_data_len += len; 1073 } 1074 1075 return (0); 1076 } 1077 1078 void 1079 icl_pdu_get_data(struct icl_pdu *ip, size_t off, void *addr, size_t len) 1080 { 1081 1082 m_copydata(ip->ip_data_mbuf, off, len, addr); 1083 } 1084 1085 void 1086 icl_pdu_queue(struct icl_pdu *ip) 1087 { 1088 struct icl_conn *ic; 1089 1090 ic = ip->ip_conn; 1091 1092 ICL_CONN_LOCK_ASSERT(ic); 1093 1094 if (ic->ic_disconnecting || ic->ic_socket == NULL) { 1095 ICL_DEBUG("icl_pdu_queue on closed connection"); 1096 icl_pdu_free(ip); 1097 return; 1098 } 1099 1100 if (!STAILQ_EMPTY(&ic->ic_to_send)) { 1101 STAILQ_INSERT_TAIL(&ic->ic_to_send, ip, ip_next); 1102 /* 1103 * If the queue is not empty, someone else had already 1104 * signaled the send thread; no need to do that again, 1105 * just return. 1106 */ 1107 return; 1108 } 1109 1110 STAILQ_INSERT_TAIL(&ic->ic_to_send, ip, ip_next); 1111 cv_signal(&ic->ic_send_cv); 1112 } 1113 1114 struct icl_conn * 1115 icl_conn_new(const char *name, struct mtx *lock) 1116 { 1117 struct icl_conn *ic; 1118 1119 refcount_acquire(&icl_ncons); 1120 1121 ic = uma_zalloc(icl_conn_zone, M_WAITOK | M_ZERO); 1122 1123 STAILQ_INIT(&ic->ic_to_send); 1124 ic->ic_lock = lock; 1125 cv_init(&ic->ic_send_cv, "icl_tx"); 1126 cv_init(&ic->ic_receive_cv, "icl_rx"); 1127 #ifdef DIAGNOSTIC 1128 refcount_init(&ic->ic_outstanding_pdus, 0); 1129 #endif 1130 ic->ic_max_data_segment_length = ICL_MAX_DATA_SEGMENT_LENGTH; 1131 ic->ic_name = name; 1132 1133 return (ic); 1134 } 1135 1136 void 1137 icl_conn_free(struct icl_conn *ic) 1138 { 1139 1140 cv_destroy(&ic->ic_send_cv); 1141 cv_destroy(&ic->ic_receive_cv); 1142 uma_zfree(icl_conn_zone, ic); 1143 refcount_release(&icl_ncons); 1144 } 1145 1146 static int 1147 icl_conn_start(struct icl_conn *ic) 1148 { 1149 size_t minspace; 1150 struct sockopt opt; 1151 int error, one = 1; 1152 1153 ICL_CONN_LOCK(ic); 1154 1155 /* 1156 * XXX: Ugly hack. 1157 */ 1158 if (ic->ic_socket == NULL) { 1159 ICL_CONN_UNLOCK(ic); 1160 return (EINVAL); 1161 } 1162 1163 ic->ic_receive_state = ICL_CONN_STATE_BHS; 1164 ic->ic_receive_len = sizeof(struct iscsi_bhs); 1165 ic->ic_disconnecting = false; 1166 1167 ICL_CONN_UNLOCK(ic); 1168 1169 /* 1170 * For sendspace, this is required because the current code cannot 1171 * send a PDU in pieces; thus, the minimum buffer size is equal 1172 * to the maximum PDU size. "+4" is to account for possible padding. 1173 * 1174 * What we should actually do here is to use autoscaling, but set 1175 * some minimal buffer size to "minspace". I don't know a way to do 1176 * that, though. 1177 */ 1178 minspace = sizeof(struct iscsi_bhs) + ic->ic_max_data_segment_length + 1179 ISCSI_HEADER_DIGEST_SIZE + ISCSI_DATA_DIGEST_SIZE + 4; 1180 if (sendspace < minspace) { 1181 ICL_WARN("kern.icl.sendspace too low; must be at least %zd", 1182 minspace); 1183 sendspace = minspace; 1184 } 1185 if (recvspace < minspace) { 1186 ICL_WARN("kern.icl.recvspace too low; must be at least %zd", 1187 minspace); 1188 recvspace = minspace; 1189 } 1190 1191 error = soreserve(ic->ic_socket, sendspace, recvspace); 1192 if (error != 0) { 1193 ICL_WARN("soreserve failed with error %d", error); 1194 icl_conn_close(ic); 1195 return (error); 1196 } 1197 1198 /* 1199 * Disable Nagle. 1200 */ 1201 bzero(&opt, sizeof(opt)); 1202 opt.sopt_dir = SOPT_SET; 1203 opt.sopt_level = IPPROTO_TCP; 1204 opt.sopt_name = TCP_NODELAY; 1205 opt.sopt_val = &one; 1206 opt.sopt_valsize = sizeof(one); 1207 error = sosetopt(ic->ic_socket, &opt); 1208 if (error != 0) { 1209 ICL_WARN("disabling TCP_NODELAY failed with error %d", error); 1210 icl_conn_close(ic); 1211 return (error); 1212 } 1213 1214 /* 1215 * Start threads. 1216 */ 1217 error = kthread_add(icl_send_thread, ic, NULL, NULL, 0, 0, "%stx", 1218 ic->ic_name); 1219 if (error != 0) { 1220 ICL_WARN("kthread_add(9) failed with error %d", error); 1221 icl_conn_close(ic); 1222 return (error); 1223 } 1224 1225 error = kthread_add(icl_receive_thread, ic, NULL, NULL, 0, 0, "%srx", 1226 ic->ic_name); 1227 if (error != 0) { 1228 ICL_WARN("kthread_add(9) failed with error %d", error); 1229 icl_conn_close(ic); 1230 return (error); 1231 } 1232 1233 /* 1234 * Register socket upcall, to get notified about incoming PDUs 1235 * and free space to send outgoing ones. 1236 */ 1237 SOCKBUF_LOCK(&ic->ic_socket->so_snd); 1238 soupcall_set(ic->ic_socket, SO_SND, icl_soupcall_send, ic); 1239 SOCKBUF_UNLOCK(&ic->ic_socket->so_snd); 1240 SOCKBUF_LOCK(&ic->ic_socket->so_rcv); 1241 soupcall_set(ic->ic_socket, SO_RCV, icl_soupcall_receive, ic); 1242 SOCKBUF_UNLOCK(&ic->ic_socket->so_rcv); 1243 1244 return (0); 1245 } 1246 1247 int 1248 icl_conn_handoff(struct icl_conn *ic, int fd) 1249 { 1250 struct file *fp; 1251 struct socket *so; 1252 cap_rights_t rights; 1253 int error; 1254 1255 ICL_CONN_LOCK_ASSERT_NOT(ic); 1256 1257 /* 1258 * Steal the socket from userland. 1259 */ 1260 error = fget(curthread, fd, 1261 cap_rights_init(&rights, CAP_SOCK_CLIENT), &fp); 1262 if (error != 0) 1263 return (error); 1264 if (fp->f_type != DTYPE_SOCKET) { 1265 fdrop(fp, curthread); 1266 return (EINVAL); 1267 } 1268 so = fp->f_data; 1269 if (so->so_type != SOCK_STREAM) { 1270 fdrop(fp, curthread); 1271 return (EINVAL); 1272 } 1273 1274 ICL_CONN_LOCK(ic); 1275 1276 if (ic->ic_socket != NULL) { 1277 ICL_CONN_UNLOCK(ic); 1278 fdrop(fp, curthread); 1279 return (EBUSY); 1280 } 1281 1282 ic->ic_socket = fp->f_data; 1283 fp->f_ops = &badfileops; 1284 fp->f_data = NULL; 1285 fdrop(fp, curthread); 1286 ICL_CONN_UNLOCK(ic); 1287 1288 error = icl_conn_start(ic); 1289 1290 return (error); 1291 } 1292 1293 void 1294 icl_conn_shutdown(struct icl_conn *ic) 1295 { 1296 ICL_CONN_LOCK_ASSERT_NOT(ic); 1297 1298 ICL_CONN_LOCK(ic); 1299 if (ic->ic_socket == NULL) { 1300 ICL_CONN_UNLOCK(ic); 1301 return; 1302 } 1303 ICL_CONN_UNLOCK(ic); 1304 1305 soshutdown(ic->ic_socket, SHUT_RDWR); 1306 } 1307 1308 void 1309 icl_conn_close(struct icl_conn *ic) 1310 { 1311 struct icl_pdu *pdu; 1312 1313 ICL_CONN_LOCK_ASSERT_NOT(ic); 1314 1315 ICL_CONN_LOCK(ic); 1316 if (ic->ic_socket == NULL) { 1317 ICL_CONN_UNLOCK(ic); 1318 return; 1319 } 1320 1321 /* 1322 * Deregister socket upcalls. 1323 */ 1324 ICL_CONN_UNLOCK(ic); 1325 SOCKBUF_LOCK(&ic->ic_socket->so_snd); 1326 if (ic->ic_socket->so_snd.sb_upcall != NULL) 1327 soupcall_clear(ic->ic_socket, SO_SND); 1328 SOCKBUF_UNLOCK(&ic->ic_socket->so_snd); 1329 SOCKBUF_LOCK(&ic->ic_socket->so_rcv); 1330 if (ic->ic_socket->so_rcv.sb_upcall != NULL) 1331 soupcall_clear(ic->ic_socket, SO_RCV); 1332 SOCKBUF_UNLOCK(&ic->ic_socket->so_rcv); 1333 ICL_CONN_LOCK(ic); 1334 1335 ic->ic_disconnecting = true; 1336 1337 /* 1338 * Wake up the threads, so they can properly terminate. 1339 */ 1340 cv_signal(&ic->ic_receive_cv); 1341 cv_signal(&ic->ic_send_cv); 1342 while (ic->ic_receive_running || ic->ic_send_running) { 1343 //ICL_DEBUG("waiting for send/receive threads to terminate"); 1344 ICL_CONN_UNLOCK(ic); 1345 cv_signal(&ic->ic_receive_cv); 1346 cv_signal(&ic->ic_send_cv); 1347 pause("icl_close", 1 * hz); 1348 ICL_CONN_LOCK(ic); 1349 } 1350 //ICL_DEBUG("send/receive threads terminated"); 1351 1352 ICL_CONN_UNLOCK(ic); 1353 soclose(ic->ic_socket); 1354 ICL_CONN_LOCK(ic); 1355 ic->ic_socket = NULL; 1356 1357 if (ic->ic_receive_pdu != NULL) { 1358 //ICL_DEBUG("freeing partially received PDU"); 1359 icl_pdu_free(ic->ic_receive_pdu); 1360 ic->ic_receive_pdu = NULL; 1361 } 1362 1363 /* 1364 * Remove any outstanding PDUs from the send queue. 1365 */ 1366 while (!STAILQ_EMPTY(&ic->ic_to_send)) { 1367 pdu = STAILQ_FIRST(&ic->ic_to_send); 1368 STAILQ_REMOVE_HEAD(&ic->ic_to_send, ip_next); 1369 icl_pdu_free(pdu); 1370 } 1371 1372 KASSERT(STAILQ_EMPTY(&ic->ic_to_send), 1373 ("destroying session with non-empty send queue")); 1374 #ifdef DIAGNOSTIC 1375 KASSERT(ic->ic_outstanding_pdus == 0, 1376 ("destroying session with %d outstanding PDUs", 1377 ic->ic_outstanding_pdus)); 1378 #endif 1379 ICL_CONN_UNLOCK(ic); 1380 } 1381 1382 bool 1383 icl_conn_connected(struct icl_conn *ic) 1384 { 1385 ICL_CONN_LOCK_ASSERT_NOT(ic); 1386 1387 ICL_CONN_LOCK(ic); 1388 if (ic->ic_socket == NULL) { 1389 ICL_CONN_UNLOCK(ic); 1390 return (false); 1391 } 1392 if (ic->ic_socket->so_error != 0) { 1393 ICL_CONN_UNLOCK(ic); 1394 return (false); 1395 } 1396 ICL_CONN_UNLOCK(ic); 1397 return (true); 1398 } 1399 1400 #ifdef ICL_KERNEL_PROXY 1401 int 1402 icl_conn_handoff_sock(struct icl_conn *ic, struct socket *so) 1403 { 1404 int error; 1405 1406 ICL_CONN_LOCK_ASSERT_NOT(ic); 1407 1408 if (so->so_type != SOCK_STREAM) 1409 return (EINVAL); 1410 1411 ICL_CONN_LOCK(ic); 1412 if (ic->ic_socket != NULL) { 1413 ICL_CONN_UNLOCK(ic); 1414 return (EBUSY); 1415 } 1416 ic->ic_socket = so; 1417 ICL_CONN_UNLOCK(ic); 1418 1419 error = icl_conn_start(ic); 1420 1421 return (error); 1422 } 1423 #endif /* ICL_KERNEL_PROXY */ 1424 1425 static int 1426 icl_unload(void) 1427 { 1428 1429 if (icl_ncons != 0) 1430 return (EBUSY); 1431 1432 uma_zdestroy(icl_conn_zone); 1433 uma_zdestroy(icl_pdu_zone); 1434 1435 return (0); 1436 } 1437 1438 static void 1439 icl_load(void) 1440 { 1441 1442 icl_conn_zone = uma_zcreate("icl_conn", 1443 sizeof(struct icl_conn), NULL, NULL, NULL, NULL, 1444 UMA_ALIGN_PTR, 0); 1445 icl_pdu_zone = uma_zcreate("icl_pdu", 1446 sizeof(struct icl_pdu), NULL, NULL, NULL, NULL, 1447 UMA_ALIGN_PTR, 0); 1448 1449 refcount_init(&icl_ncons, 0); 1450 } 1451 1452 static int 1453 icl_modevent(module_t mod, int what, void *arg) 1454 { 1455 1456 switch (what) { 1457 case MOD_LOAD: 1458 icl_load(); 1459 return (0); 1460 case MOD_UNLOAD: 1461 return (icl_unload()); 1462 default: 1463 return (EINVAL); 1464 } 1465 } 1466 1467 moduledata_t icl_data = { 1468 "icl", 1469 icl_modevent, 1470 0 1471 }; 1472 1473 DECLARE_MODULE(icl, icl_data, SI_SUB_DRIVERS, SI_ORDER_FIRST); 1474 MODULE_VERSION(icl, 1); 1475