1 /* 2 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved. 3 * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <linux/module.h> 35 36 #include <net/tcp.h> 37 #include <net/inet_common.h> 38 #include <linux/highmem.h> 39 #include <linux/netdevice.h> 40 #include <linux/sched/signal.h> 41 #include <linux/inetdevice.h> 42 43 #include <net/tls.h> 44 45 MODULE_AUTHOR("Mellanox Technologies"); 46 MODULE_DESCRIPTION("Transport Layer Security Support"); 47 MODULE_LICENSE("Dual BSD/GPL"); 48 49 enum { 50 TLSV4, 51 TLSV6, 52 TLS_NUM_PROTS, 53 }; 54 enum { 55 TLS_BASE, 56 TLS_SW, 57 #ifdef CONFIG_TLS_DEVICE 58 TLS_HW, 59 #endif 60 TLS_HW_RECORD, 61 TLS_NUM_CONFIG, 62 }; 63 64 static struct proto *saved_tcpv6_prot; 65 static DEFINE_MUTEX(tcpv6_prot_mutex); 66 static LIST_HEAD(device_list); 67 static DEFINE_MUTEX(device_mutex); 68 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG]; 69 static struct proto_ops tls_sw_proto_ops; 70 71 static void update_sk_prot(struct sock *sk, struct tls_context *ctx) 72 { 73 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; 74 75 sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]; 76 } 77 78 int wait_on_pending_writer(struct sock *sk, long *timeo) 79 { 80 int rc = 0; 81 DEFINE_WAIT_FUNC(wait, woken_wake_function); 82 83 add_wait_queue(sk_sleep(sk), &wait); 84 while (1) { 85 if (!*timeo) { 86 rc = -EAGAIN; 87 break; 88 } 89 90 if (signal_pending(current)) { 91 rc = sock_intr_errno(*timeo); 92 break; 93 } 94 95 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait)) 96 break; 97 } 98 remove_wait_queue(sk_sleep(sk), &wait); 99 return rc; 100 } 101 102 int tls_push_sg(struct sock *sk, 103 struct tls_context *ctx, 104 struct scatterlist *sg, 105 u16 first_offset, 106 int flags) 107 { 108 int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST; 109 int ret = 0; 110 struct page *p; 111 size_t size; 112 int offset = first_offset; 113 114 size = sg->length - offset; 115 offset += sg->offset; 116 117 ctx->in_tcp_sendpages = true; 118 while (1) { 119 if (sg_is_last(sg)) 120 sendpage_flags = flags; 121 122 /* is sending application-limited? */ 123 tcp_rate_check_app_limited(sk); 124 p = sg_page(sg); 125 retry: 126 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags); 127 128 if (ret != size) { 129 if (ret > 0) { 130 offset += ret; 131 size -= ret; 132 goto retry; 133 } 134 135 offset -= sg->offset; 136 ctx->partially_sent_offset = offset; 137 ctx->partially_sent_record = (void *)sg; 138 return ret; 139 } 140 141 put_page(p); 142 sk_mem_uncharge(sk, sg->length); 143 sg = sg_next(sg); 144 if (!sg) 145 break; 146 147 offset = sg->offset; 148 size = sg->length; 149 } 150 151 clear_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags); 152 ctx->in_tcp_sendpages = false; 153 ctx->sk_write_space(sk); 154 155 return 0; 156 } 157 158 static int tls_handle_open_record(struct sock *sk, int flags) 159 { 160 struct tls_context *ctx = tls_get_ctx(sk); 161 162 if (tls_is_pending_open_record(ctx)) 163 return ctx->push_pending_record(sk, flags); 164 165 return 0; 166 } 167 168 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, 169 unsigned char *record_type) 170 { 171 struct cmsghdr *cmsg; 172 int rc = -EINVAL; 173 174 for_each_cmsghdr(cmsg, msg) { 175 if (!CMSG_OK(msg, cmsg)) 176 return -EINVAL; 177 if (cmsg->cmsg_level != SOL_TLS) 178 continue; 179 180 switch (cmsg->cmsg_type) { 181 case TLS_SET_RECORD_TYPE: 182 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type))) 183 return -EINVAL; 184 185 if (msg->msg_flags & MSG_MORE) 186 return -EINVAL; 187 188 rc = tls_handle_open_record(sk, msg->msg_flags); 189 if (rc) 190 return rc; 191 192 *record_type = *(unsigned char *)CMSG_DATA(cmsg); 193 rc = 0; 194 break; 195 default: 196 return -EINVAL; 197 } 198 } 199 200 return rc; 201 } 202 203 int tls_push_pending_closed_record(struct sock *sk, struct tls_context *ctx, 204 int flags, long *timeo) 205 { 206 struct scatterlist *sg; 207 u16 offset; 208 209 if (!tls_is_partially_sent_record(ctx)) 210 return ctx->push_pending_record(sk, flags); 211 212 sg = ctx->partially_sent_record; 213 offset = ctx->partially_sent_offset; 214 215 ctx->partially_sent_record = NULL; 216 return tls_push_sg(sk, ctx, sg, offset, flags); 217 } 218 219 static void tls_write_space(struct sock *sk) 220 { 221 struct tls_context *ctx = tls_get_ctx(sk); 222 223 /* We are already sending pages, ignore notification */ 224 if (ctx->in_tcp_sendpages) 225 return; 226 227 if (!sk->sk_write_pending && tls_is_pending_closed_record(ctx)) { 228 gfp_t sk_allocation = sk->sk_allocation; 229 int rc; 230 long timeo = 0; 231 232 sk->sk_allocation = GFP_ATOMIC; 233 rc = tls_push_pending_closed_record(sk, ctx, 234 MSG_DONTWAIT | 235 MSG_NOSIGNAL, 236 &timeo); 237 sk->sk_allocation = sk_allocation; 238 239 if (rc < 0) 240 return; 241 } 242 243 ctx->sk_write_space(sk); 244 } 245 246 static void tls_sk_proto_close(struct sock *sk, long timeout) 247 { 248 struct tls_context *ctx = tls_get_ctx(sk); 249 long timeo = sock_sndtimeo(sk, 0); 250 void (*sk_proto_close)(struct sock *sk, long timeout); 251 252 lock_sock(sk); 253 sk_proto_close = ctx->sk_proto_close; 254 255 if (ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD) 256 goto skip_tx_cleanup; 257 258 if (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE) { 259 kfree(ctx); 260 ctx = NULL; 261 goto skip_tx_cleanup; 262 } 263 264 if (!tls_complete_pending_work(sk, ctx, 0, &timeo)) 265 tls_handle_open_record(sk, 0); 266 267 if (ctx->partially_sent_record) { 268 struct scatterlist *sg = ctx->partially_sent_record; 269 270 while (1) { 271 put_page(sg_page(sg)); 272 sk_mem_uncharge(sk, sg->length); 273 274 if (sg_is_last(sg)) 275 break; 276 sg++; 277 } 278 } 279 280 /* We need these for tls_sw_fallback handling of other packets */ 281 if (ctx->tx_conf == TLS_SW) { 282 kfree(ctx->tx.rec_seq); 283 kfree(ctx->tx.iv); 284 tls_sw_free_resources_tx(sk); 285 } 286 287 if (ctx->rx_conf == TLS_SW) { 288 kfree(ctx->rx.rec_seq); 289 kfree(ctx->rx.iv); 290 tls_sw_free_resources_rx(sk); 291 } 292 293 #ifdef CONFIG_TLS_DEVICE 294 if (ctx->tx_conf != TLS_HW) { 295 #else 296 { 297 #endif 298 kfree(ctx); 299 ctx = NULL; 300 } 301 302 skip_tx_cleanup: 303 release_sock(sk); 304 sk_proto_close(sk, timeout); 305 /* free ctx for TLS_HW_RECORD, used by tcp_set_state 306 * for sk->sk_prot->unhash [tls_hw_unhash] 307 */ 308 if (ctx && ctx->tx_conf == TLS_HW_RECORD && 309 ctx->rx_conf == TLS_HW_RECORD) 310 kfree(ctx); 311 } 312 313 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval, 314 int __user *optlen) 315 { 316 int rc = 0; 317 struct tls_context *ctx = tls_get_ctx(sk); 318 struct tls_crypto_info *crypto_info; 319 int len; 320 321 if (get_user(len, optlen)) 322 return -EFAULT; 323 324 if (!optval || (len < sizeof(*crypto_info))) { 325 rc = -EINVAL; 326 goto out; 327 } 328 329 if (!ctx) { 330 rc = -EBUSY; 331 goto out; 332 } 333 334 /* get user crypto info */ 335 crypto_info = &ctx->crypto_send; 336 337 if (!TLS_CRYPTO_INFO_READY(crypto_info)) { 338 rc = -EBUSY; 339 goto out; 340 } 341 342 if (len == sizeof(*crypto_info)) { 343 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) 344 rc = -EFAULT; 345 goto out; 346 } 347 348 switch (crypto_info->cipher_type) { 349 case TLS_CIPHER_AES_GCM_128: { 350 struct tls12_crypto_info_aes_gcm_128 * 351 crypto_info_aes_gcm_128 = 352 container_of(crypto_info, 353 struct tls12_crypto_info_aes_gcm_128, 354 info); 355 356 if (len != sizeof(*crypto_info_aes_gcm_128)) { 357 rc = -EINVAL; 358 goto out; 359 } 360 lock_sock(sk); 361 memcpy(crypto_info_aes_gcm_128->iv, 362 ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, 363 TLS_CIPHER_AES_GCM_128_IV_SIZE); 364 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq, 365 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); 366 release_sock(sk); 367 if (copy_to_user(optval, 368 crypto_info_aes_gcm_128, 369 sizeof(*crypto_info_aes_gcm_128))) 370 rc = -EFAULT; 371 break; 372 } 373 default: 374 rc = -EINVAL; 375 } 376 377 out: 378 return rc; 379 } 380 381 static int do_tls_getsockopt(struct sock *sk, int optname, 382 char __user *optval, int __user *optlen) 383 { 384 int rc = 0; 385 386 switch (optname) { 387 case TLS_TX: 388 rc = do_tls_getsockopt_tx(sk, optval, optlen); 389 break; 390 default: 391 rc = -ENOPROTOOPT; 392 break; 393 } 394 return rc; 395 } 396 397 static int tls_getsockopt(struct sock *sk, int level, int optname, 398 char __user *optval, int __user *optlen) 399 { 400 struct tls_context *ctx = tls_get_ctx(sk); 401 402 if (level != SOL_TLS) 403 return ctx->getsockopt(sk, level, optname, optval, optlen); 404 405 return do_tls_getsockopt(sk, optname, optval, optlen); 406 } 407 408 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval, 409 unsigned int optlen, int tx) 410 { 411 struct tls_crypto_info *crypto_info; 412 struct tls_context *ctx = tls_get_ctx(sk); 413 int rc = 0; 414 int conf; 415 416 if (!optval || (optlen < sizeof(*crypto_info))) { 417 rc = -EINVAL; 418 goto out; 419 } 420 421 if (tx) 422 crypto_info = &ctx->crypto_send; 423 else 424 crypto_info = &ctx->crypto_recv; 425 426 /* Currently we don't support set crypto info more than one time */ 427 if (TLS_CRYPTO_INFO_READY(crypto_info)) { 428 rc = -EBUSY; 429 goto out; 430 } 431 432 rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info)); 433 if (rc) { 434 rc = -EFAULT; 435 goto err_crypto_info; 436 } 437 438 /* check version */ 439 if (crypto_info->version != TLS_1_2_VERSION) { 440 rc = -ENOTSUPP; 441 goto err_crypto_info; 442 } 443 444 switch (crypto_info->cipher_type) { 445 case TLS_CIPHER_AES_GCM_128: { 446 if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) { 447 rc = -EINVAL; 448 goto err_crypto_info; 449 } 450 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info), 451 optlen - sizeof(*crypto_info)); 452 if (rc) { 453 rc = -EFAULT; 454 goto err_crypto_info; 455 } 456 break; 457 } 458 default: 459 rc = -EINVAL; 460 goto err_crypto_info; 461 } 462 463 if (tx) { 464 #ifdef CONFIG_TLS_DEVICE 465 rc = tls_set_device_offload(sk, ctx); 466 conf = TLS_HW; 467 if (rc) { 468 #else 469 { 470 #endif 471 rc = tls_set_sw_offload(sk, ctx, 1); 472 conf = TLS_SW; 473 } 474 } else { 475 rc = tls_set_sw_offload(sk, ctx, 0); 476 conf = TLS_SW; 477 } 478 479 if (rc) 480 goto err_crypto_info; 481 482 if (tx) 483 ctx->tx_conf = conf; 484 else 485 ctx->rx_conf = conf; 486 update_sk_prot(sk, ctx); 487 if (tx) { 488 ctx->sk_write_space = sk->sk_write_space; 489 sk->sk_write_space = tls_write_space; 490 } else { 491 sk->sk_socket->ops = &tls_sw_proto_ops; 492 } 493 goto out; 494 495 err_crypto_info: 496 memset(crypto_info, 0, sizeof(*crypto_info)); 497 out: 498 return rc; 499 } 500 501 static int do_tls_setsockopt(struct sock *sk, int optname, 502 char __user *optval, unsigned int optlen) 503 { 504 int rc = 0; 505 506 switch (optname) { 507 case TLS_TX: 508 case TLS_RX: 509 lock_sock(sk); 510 rc = do_tls_setsockopt_conf(sk, optval, optlen, 511 optname == TLS_TX); 512 release_sock(sk); 513 break; 514 default: 515 rc = -ENOPROTOOPT; 516 break; 517 } 518 return rc; 519 } 520 521 static int tls_setsockopt(struct sock *sk, int level, int optname, 522 char __user *optval, unsigned int optlen) 523 { 524 struct tls_context *ctx = tls_get_ctx(sk); 525 526 if (level != SOL_TLS) 527 return ctx->setsockopt(sk, level, optname, optval, optlen); 528 529 return do_tls_setsockopt(sk, optname, optval, optlen); 530 } 531 532 static struct tls_context *create_ctx(struct sock *sk) 533 { 534 struct inet_connection_sock *icsk = inet_csk(sk); 535 struct tls_context *ctx; 536 537 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 538 if (!ctx) 539 return NULL; 540 541 icsk->icsk_ulp_data = ctx; 542 return ctx; 543 } 544 545 static int tls_hw_prot(struct sock *sk) 546 { 547 struct tls_context *ctx; 548 struct tls_device *dev; 549 int rc = 0; 550 551 mutex_lock(&device_mutex); 552 list_for_each_entry(dev, &device_list, dev_list) { 553 if (dev->feature && dev->feature(dev)) { 554 ctx = create_ctx(sk); 555 if (!ctx) 556 goto out; 557 558 ctx->hash = sk->sk_prot->hash; 559 ctx->unhash = sk->sk_prot->unhash; 560 ctx->sk_proto_close = sk->sk_prot->close; 561 ctx->rx_conf = TLS_HW_RECORD; 562 ctx->tx_conf = TLS_HW_RECORD; 563 update_sk_prot(sk, ctx); 564 rc = 1; 565 break; 566 } 567 } 568 out: 569 mutex_unlock(&device_mutex); 570 return rc; 571 } 572 573 static void tls_hw_unhash(struct sock *sk) 574 { 575 struct tls_context *ctx = tls_get_ctx(sk); 576 struct tls_device *dev; 577 578 mutex_lock(&device_mutex); 579 list_for_each_entry(dev, &device_list, dev_list) { 580 if (dev->unhash) 581 dev->unhash(dev, sk); 582 } 583 mutex_unlock(&device_mutex); 584 ctx->unhash(sk); 585 } 586 587 static int tls_hw_hash(struct sock *sk) 588 { 589 struct tls_context *ctx = tls_get_ctx(sk); 590 struct tls_device *dev; 591 int err; 592 593 err = ctx->hash(sk); 594 mutex_lock(&device_mutex); 595 list_for_each_entry(dev, &device_list, dev_list) { 596 if (dev->hash) 597 err |= dev->hash(dev, sk); 598 } 599 mutex_unlock(&device_mutex); 600 601 if (err) 602 tls_hw_unhash(sk); 603 return err; 604 } 605 606 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], 607 struct proto *base) 608 { 609 prot[TLS_BASE][TLS_BASE] = *base; 610 prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; 611 prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; 612 prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; 613 614 prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; 615 prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; 616 prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; 617 618 prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; 619 prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; 620 prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; 621 622 prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; 623 prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; 624 prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; 625 626 #ifdef CONFIG_TLS_DEVICE 627 prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; 628 prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; 629 prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; 630 631 prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; 632 prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; 633 prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; 634 #endif 635 636 prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; 637 prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_hw_hash; 638 prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_hw_unhash; 639 prot[TLS_HW_RECORD][TLS_HW_RECORD].close = tls_sk_proto_close; 640 } 641 642 static int tls_init(struct sock *sk) 643 { 644 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; 645 struct tls_context *ctx; 646 int rc = 0; 647 648 if (tls_hw_prot(sk)) 649 goto out; 650 651 /* The TLS ulp is currently supported only for TCP sockets 652 * in ESTABLISHED state. 653 * Supporting sockets in LISTEN state will require us 654 * to modify the accept implementation to clone rather then 655 * share the ulp context. 656 */ 657 if (sk->sk_state != TCP_ESTABLISHED) 658 return -ENOTSUPP; 659 660 /* allocate tls context */ 661 ctx = create_ctx(sk); 662 if (!ctx) { 663 rc = -ENOMEM; 664 goto out; 665 } 666 ctx->setsockopt = sk->sk_prot->setsockopt; 667 ctx->getsockopt = sk->sk_prot->getsockopt; 668 ctx->sk_proto_close = sk->sk_prot->close; 669 670 /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ 671 if (ip_ver == TLSV6 && 672 unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) { 673 mutex_lock(&tcpv6_prot_mutex); 674 if (likely(sk->sk_prot != saved_tcpv6_prot)) { 675 build_protos(tls_prots[TLSV6], sk->sk_prot); 676 smp_store_release(&saved_tcpv6_prot, sk->sk_prot); 677 } 678 mutex_unlock(&tcpv6_prot_mutex); 679 } 680 681 ctx->tx_conf = TLS_BASE; 682 ctx->rx_conf = TLS_BASE; 683 update_sk_prot(sk, ctx); 684 out: 685 return rc; 686 } 687 688 void tls_register_device(struct tls_device *device) 689 { 690 mutex_lock(&device_mutex); 691 list_add_tail(&device->dev_list, &device_list); 692 mutex_unlock(&device_mutex); 693 } 694 EXPORT_SYMBOL(tls_register_device); 695 696 void tls_unregister_device(struct tls_device *device) 697 { 698 mutex_lock(&device_mutex); 699 list_del(&device->dev_list); 700 mutex_unlock(&device_mutex); 701 } 702 EXPORT_SYMBOL(tls_unregister_device); 703 704 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { 705 .name = "tls", 706 .uid = TCP_ULP_TLS, 707 .user_visible = true, 708 .owner = THIS_MODULE, 709 .init = tls_init, 710 }; 711 712 static int __init tls_register(void) 713 { 714 build_protos(tls_prots[TLSV4], &tcp_prot); 715 716 tls_sw_proto_ops = inet_stream_ops; 717 tls_sw_proto_ops.poll = tls_sw_poll; 718 tls_sw_proto_ops.splice_read = tls_sw_splice_read; 719 720 #ifdef CONFIG_TLS_DEVICE 721 tls_device_init(); 722 #endif 723 tcp_register_ulp(&tcp_tls_ulp_ops); 724 725 return 0; 726 } 727 728 static void __exit tls_unregister(void) 729 { 730 tcp_unregister_ulp(&tcp_tls_ulp_ops); 731 #ifdef CONFIG_TLS_DEVICE 732 tls_device_cleanup(); 733 #endif 734 } 735 736 module_init(tls_register); 737 module_exit(tls_unregister); 738