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 MODULE_ALIAS_TCP_ULP("tls"); 49 50 enum { 51 TLSV4, 52 TLSV6, 53 TLS_NUM_PROTS, 54 }; 55 56 static struct proto *saved_tcpv6_prot; 57 static DEFINE_MUTEX(tcpv6_prot_mutex); 58 static struct proto *saved_tcpv4_prot; 59 static DEFINE_MUTEX(tcpv4_prot_mutex); 60 static LIST_HEAD(device_list); 61 static DEFINE_SPINLOCK(device_spinlock); 62 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG]; 63 static struct proto_ops tls_sw_proto_ops; 64 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], 65 struct proto *base); 66 67 static void update_sk_prot(struct sock *sk, struct tls_context *ctx) 68 { 69 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; 70 71 sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]; 72 } 73 74 int wait_on_pending_writer(struct sock *sk, long *timeo) 75 { 76 int rc = 0; 77 DEFINE_WAIT_FUNC(wait, woken_wake_function); 78 79 add_wait_queue(sk_sleep(sk), &wait); 80 while (1) { 81 if (!*timeo) { 82 rc = -EAGAIN; 83 break; 84 } 85 86 if (signal_pending(current)) { 87 rc = sock_intr_errno(*timeo); 88 break; 89 } 90 91 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait)) 92 break; 93 } 94 remove_wait_queue(sk_sleep(sk), &wait); 95 return rc; 96 } 97 98 int tls_push_sg(struct sock *sk, 99 struct tls_context *ctx, 100 struct scatterlist *sg, 101 u16 first_offset, 102 int flags) 103 { 104 int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST; 105 int ret = 0; 106 struct page *p; 107 size_t size; 108 int offset = first_offset; 109 110 size = sg->length - offset; 111 offset += sg->offset; 112 113 ctx->in_tcp_sendpages = true; 114 while (1) { 115 if (sg_is_last(sg)) 116 sendpage_flags = flags; 117 118 /* is sending application-limited? */ 119 tcp_rate_check_app_limited(sk); 120 p = sg_page(sg); 121 retry: 122 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags); 123 124 if (ret != size) { 125 if (ret > 0) { 126 offset += ret; 127 size -= ret; 128 goto retry; 129 } 130 131 offset -= sg->offset; 132 ctx->partially_sent_offset = offset; 133 ctx->partially_sent_record = (void *)sg; 134 ctx->in_tcp_sendpages = false; 135 return ret; 136 } 137 138 put_page(p); 139 sk_mem_uncharge(sk, sg->length); 140 sg = sg_next(sg); 141 if (!sg) 142 break; 143 144 offset = sg->offset; 145 size = sg->length; 146 } 147 148 ctx->in_tcp_sendpages = false; 149 150 return 0; 151 } 152 153 static int tls_handle_open_record(struct sock *sk, int flags) 154 { 155 struct tls_context *ctx = tls_get_ctx(sk); 156 157 if (tls_is_pending_open_record(ctx)) 158 return ctx->push_pending_record(sk, flags); 159 160 return 0; 161 } 162 163 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, 164 unsigned char *record_type) 165 { 166 struct cmsghdr *cmsg; 167 int rc = -EINVAL; 168 169 for_each_cmsghdr(cmsg, msg) { 170 if (!CMSG_OK(msg, cmsg)) 171 return -EINVAL; 172 if (cmsg->cmsg_level != SOL_TLS) 173 continue; 174 175 switch (cmsg->cmsg_type) { 176 case TLS_SET_RECORD_TYPE: 177 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type))) 178 return -EINVAL; 179 180 if (msg->msg_flags & MSG_MORE) 181 return -EINVAL; 182 183 rc = tls_handle_open_record(sk, msg->msg_flags); 184 if (rc) 185 return rc; 186 187 *record_type = *(unsigned char *)CMSG_DATA(cmsg); 188 rc = 0; 189 break; 190 default: 191 return -EINVAL; 192 } 193 } 194 195 return rc; 196 } 197 198 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, 199 int flags) 200 { 201 struct scatterlist *sg; 202 u16 offset; 203 204 sg = ctx->partially_sent_record; 205 offset = ctx->partially_sent_offset; 206 207 ctx->partially_sent_record = NULL; 208 return tls_push_sg(sk, ctx, sg, offset, flags); 209 } 210 211 bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx) 212 { 213 struct scatterlist *sg; 214 215 sg = ctx->partially_sent_record; 216 if (!sg) 217 return false; 218 219 while (1) { 220 put_page(sg_page(sg)); 221 sk_mem_uncharge(sk, sg->length); 222 223 if (sg_is_last(sg)) 224 break; 225 sg++; 226 } 227 ctx->partially_sent_record = NULL; 228 return true; 229 } 230 231 static void tls_write_space(struct sock *sk) 232 { 233 struct tls_context *ctx = tls_get_ctx(sk); 234 235 /* If in_tcp_sendpages call lower protocol write space handler 236 * to ensure we wake up any waiting operations there. For example 237 * if do_tcp_sendpages where to call sk_wait_event. 238 */ 239 if (ctx->in_tcp_sendpages) { 240 ctx->sk_write_space(sk); 241 return; 242 } 243 244 #ifdef CONFIG_TLS_DEVICE 245 if (ctx->tx_conf == TLS_HW) 246 tls_device_write_space(sk, ctx); 247 else 248 #endif 249 tls_sw_write_space(sk, ctx); 250 251 ctx->sk_write_space(sk); 252 } 253 254 void tls_ctx_free(struct tls_context *ctx) 255 { 256 if (!ctx) 257 return; 258 259 memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); 260 memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); 261 kfree(ctx); 262 } 263 264 static void tls_sk_proto_cleanup(struct sock *sk, 265 struct tls_context *ctx, long timeo) 266 { 267 if (unlikely(sk->sk_write_pending) && 268 !wait_on_pending_writer(sk, &timeo)) 269 tls_handle_open_record(sk, 0); 270 271 /* We need these for tls_sw_fallback handling of other packets */ 272 if (ctx->tx_conf == TLS_SW) { 273 kfree(ctx->tx.rec_seq); 274 kfree(ctx->tx.iv); 275 tls_sw_release_resources_tx(sk); 276 #ifdef CONFIG_TLS_DEVICE 277 } else if (ctx->tx_conf == TLS_HW) { 278 tls_device_free_resources_tx(sk); 279 #endif 280 } 281 282 if (ctx->rx_conf == TLS_SW) 283 tls_sw_release_resources_rx(sk); 284 285 #ifdef CONFIG_TLS_DEVICE 286 if (ctx->rx_conf == TLS_HW) 287 tls_device_offload_cleanup_rx(sk); 288 #endif 289 } 290 291 static void tls_sk_proto_close(struct sock *sk, long timeout) 292 { 293 struct inet_connection_sock *icsk = inet_csk(sk); 294 struct tls_context *ctx = tls_get_ctx(sk); 295 long timeo = sock_sndtimeo(sk, 0); 296 bool free_ctx; 297 298 if (ctx->tx_conf == TLS_SW) 299 tls_sw_cancel_work_tx(ctx); 300 301 lock_sock(sk); 302 free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW; 303 304 if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE) 305 tls_sk_proto_cleanup(sk, ctx, timeo); 306 307 write_lock_bh(&sk->sk_callback_lock); 308 if (free_ctx) 309 icsk->icsk_ulp_data = NULL; 310 sk->sk_prot = ctx->sk_proto; 311 if (sk->sk_write_space == tls_write_space) 312 sk->sk_write_space = ctx->sk_write_space; 313 write_unlock_bh(&sk->sk_callback_lock); 314 release_sock(sk); 315 if (ctx->tx_conf == TLS_SW) 316 tls_sw_free_ctx_tx(ctx); 317 if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) 318 tls_sw_strparser_done(ctx); 319 if (ctx->rx_conf == TLS_SW) 320 tls_sw_free_ctx_rx(ctx); 321 ctx->sk_proto_close(sk, timeout); 322 323 if (free_ctx) 324 tls_ctx_free(ctx); 325 } 326 327 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval, 328 int __user *optlen) 329 { 330 int rc = 0; 331 struct tls_context *ctx = tls_get_ctx(sk); 332 struct tls_crypto_info *crypto_info; 333 int len; 334 335 if (get_user(len, optlen)) 336 return -EFAULT; 337 338 if (!optval || (len < sizeof(*crypto_info))) { 339 rc = -EINVAL; 340 goto out; 341 } 342 343 if (!ctx) { 344 rc = -EBUSY; 345 goto out; 346 } 347 348 /* get user crypto info */ 349 crypto_info = &ctx->crypto_send.info; 350 351 if (!TLS_CRYPTO_INFO_READY(crypto_info)) { 352 rc = -EBUSY; 353 goto out; 354 } 355 356 if (len == sizeof(*crypto_info)) { 357 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) 358 rc = -EFAULT; 359 goto out; 360 } 361 362 switch (crypto_info->cipher_type) { 363 case TLS_CIPHER_AES_GCM_128: { 364 struct tls12_crypto_info_aes_gcm_128 * 365 crypto_info_aes_gcm_128 = 366 container_of(crypto_info, 367 struct tls12_crypto_info_aes_gcm_128, 368 info); 369 370 if (len != sizeof(*crypto_info_aes_gcm_128)) { 371 rc = -EINVAL; 372 goto out; 373 } 374 lock_sock(sk); 375 memcpy(crypto_info_aes_gcm_128->iv, 376 ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, 377 TLS_CIPHER_AES_GCM_128_IV_SIZE); 378 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq, 379 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); 380 release_sock(sk); 381 if (copy_to_user(optval, 382 crypto_info_aes_gcm_128, 383 sizeof(*crypto_info_aes_gcm_128))) 384 rc = -EFAULT; 385 break; 386 } 387 case TLS_CIPHER_AES_GCM_256: { 388 struct tls12_crypto_info_aes_gcm_256 * 389 crypto_info_aes_gcm_256 = 390 container_of(crypto_info, 391 struct tls12_crypto_info_aes_gcm_256, 392 info); 393 394 if (len != sizeof(*crypto_info_aes_gcm_256)) { 395 rc = -EINVAL; 396 goto out; 397 } 398 lock_sock(sk); 399 memcpy(crypto_info_aes_gcm_256->iv, 400 ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE, 401 TLS_CIPHER_AES_GCM_256_IV_SIZE); 402 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq, 403 TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE); 404 release_sock(sk); 405 if (copy_to_user(optval, 406 crypto_info_aes_gcm_256, 407 sizeof(*crypto_info_aes_gcm_256))) 408 rc = -EFAULT; 409 break; 410 } 411 default: 412 rc = -EINVAL; 413 } 414 415 out: 416 return rc; 417 } 418 419 static int do_tls_getsockopt(struct sock *sk, int optname, 420 char __user *optval, int __user *optlen) 421 { 422 int rc = 0; 423 424 switch (optname) { 425 case TLS_TX: 426 rc = do_tls_getsockopt_tx(sk, optval, optlen); 427 break; 428 default: 429 rc = -ENOPROTOOPT; 430 break; 431 } 432 return rc; 433 } 434 435 static int tls_getsockopt(struct sock *sk, int level, int optname, 436 char __user *optval, int __user *optlen) 437 { 438 struct tls_context *ctx = tls_get_ctx(sk); 439 440 if (level != SOL_TLS) 441 return ctx->getsockopt(sk, level, optname, optval, optlen); 442 443 return do_tls_getsockopt(sk, optname, optval, optlen); 444 } 445 446 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval, 447 unsigned int optlen, int tx) 448 { 449 struct tls_crypto_info *crypto_info; 450 struct tls_crypto_info *alt_crypto_info; 451 struct tls_context *ctx = tls_get_ctx(sk); 452 size_t optsize; 453 int rc = 0; 454 int conf; 455 456 if (!optval || (optlen < sizeof(*crypto_info))) { 457 rc = -EINVAL; 458 goto out; 459 } 460 461 if (tx) { 462 crypto_info = &ctx->crypto_send.info; 463 alt_crypto_info = &ctx->crypto_recv.info; 464 } else { 465 crypto_info = &ctx->crypto_recv.info; 466 alt_crypto_info = &ctx->crypto_send.info; 467 } 468 469 /* Currently we don't support set crypto info more than one time */ 470 if (TLS_CRYPTO_INFO_READY(crypto_info)) { 471 rc = -EBUSY; 472 goto out; 473 } 474 475 rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info)); 476 if (rc) { 477 rc = -EFAULT; 478 goto err_crypto_info; 479 } 480 481 /* check version */ 482 if (crypto_info->version != TLS_1_2_VERSION && 483 crypto_info->version != TLS_1_3_VERSION) { 484 rc = -ENOTSUPP; 485 goto err_crypto_info; 486 } 487 488 /* Ensure that TLS version and ciphers are same in both directions */ 489 if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) { 490 if (alt_crypto_info->version != crypto_info->version || 491 alt_crypto_info->cipher_type != crypto_info->cipher_type) { 492 rc = -EINVAL; 493 goto err_crypto_info; 494 } 495 } 496 497 switch (crypto_info->cipher_type) { 498 case TLS_CIPHER_AES_GCM_128: 499 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128); 500 break; 501 case TLS_CIPHER_AES_GCM_256: { 502 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256); 503 break; 504 } 505 case TLS_CIPHER_AES_CCM_128: 506 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128); 507 break; 508 default: 509 rc = -EINVAL; 510 goto err_crypto_info; 511 } 512 513 if (optlen != optsize) { 514 rc = -EINVAL; 515 goto err_crypto_info; 516 } 517 518 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info), 519 optlen - sizeof(*crypto_info)); 520 if (rc) { 521 rc = -EFAULT; 522 goto err_crypto_info; 523 } 524 525 if (tx) { 526 #ifdef CONFIG_TLS_DEVICE 527 rc = tls_set_device_offload(sk, ctx); 528 conf = TLS_HW; 529 if (rc) { 530 #else 531 { 532 #endif 533 rc = tls_set_sw_offload(sk, ctx, 1); 534 if (rc) 535 goto err_crypto_info; 536 conf = TLS_SW; 537 } 538 } else { 539 #ifdef CONFIG_TLS_DEVICE 540 rc = tls_set_device_offload_rx(sk, ctx); 541 conf = TLS_HW; 542 if (rc) { 543 #else 544 { 545 #endif 546 rc = tls_set_sw_offload(sk, ctx, 0); 547 if (rc) 548 goto err_crypto_info; 549 conf = TLS_SW; 550 } 551 tls_sw_strparser_arm(sk, ctx); 552 } 553 554 if (tx) 555 ctx->tx_conf = conf; 556 else 557 ctx->rx_conf = conf; 558 update_sk_prot(sk, ctx); 559 if (tx) { 560 ctx->sk_write_space = sk->sk_write_space; 561 sk->sk_write_space = tls_write_space; 562 } else { 563 sk->sk_socket->ops = &tls_sw_proto_ops; 564 } 565 goto out; 566 567 err_crypto_info: 568 memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); 569 out: 570 return rc; 571 } 572 573 static int do_tls_setsockopt(struct sock *sk, int optname, 574 char __user *optval, unsigned int optlen) 575 { 576 int rc = 0; 577 578 switch (optname) { 579 case TLS_TX: 580 case TLS_RX: 581 lock_sock(sk); 582 rc = do_tls_setsockopt_conf(sk, optval, optlen, 583 optname == TLS_TX); 584 release_sock(sk); 585 break; 586 default: 587 rc = -ENOPROTOOPT; 588 break; 589 } 590 return rc; 591 } 592 593 static int tls_setsockopt(struct sock *sk, int level, int optname, 594 char __user *optval, unsigned int optlen) 595 { 596 struct tls_context *ctx = tls_get_ctx(sk); 597 598 if (level != SOL_TLS) 599 return ctx->setsockopt(sk, level, optname, optval, optlen); 600 601 return do_tls_setsockopt(sk, optname, optval, optlen); 602 } 603 604 static struct tls_context *create_ctx(struct sock *sk) 605 { 606 struct inet_connection_sock *icsk = inet_csk(sk); 607 struct tls_context *ctx; 608 609 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); 610 if (!ctx) 611 return NULL; 612 613 icsk->icsk_ulp_data = ctx; 614 ctx->setsockopt = sk->sk_prot->setsockopt; 615 ctx->getsockopt = sk->sk_prot->getsockopt; 616 ctx->sk_proto_close = sk->sk_prot->close; 617 ctx->unhash = sk->sk_prot->unhash; 618 return ctx; 619 } 620 621 static void tls_build_proto(struct sock *sk) 622 { 623 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; 624 625 /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ 626 if (ip_ver == TLSV6 && 627 unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) { 628 mutex_lock(&tcpv6_prot_mutex); 629 if (likely(sk->sk_prot != saved_tcpv6_prot)) { 630 build_protos(tls_prots[TLSV6], sk->sk_prot); 631 smp_store_release(&saved_tcpv6_prot, sk->sk_prot); 632 } 633 mutex_unlock(&tcpv6_prot_mutex); 634 } 635 636 if (ip_ver == TLSV4 && 637 unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) { 638 mutex_lock(&tcpv4_prot_mutex); 639 if (likely(sk->sk_prot != saved_tcpv4_prot)) { 640 build_protos(tls_prots[TLSV4], sk->sk_prot); 641 smp_store_release(&saved_tcpv4_prot, sk->sk_prot); 642 } 643 mutex_unlock(&tcpv4_prot_mutex); 644 } 645 } 646 647 static void tls_hw_sk_destruct(struct sock *sk) 648 { 649 struct tls_context *ctx = tls_get_ctx(sk); 650 struct inet_connection_sock *icsk = inet_csk(sk); 651 652 ctx->sk_destruct(sk); 653 /* Free ctx */ 654 tls_ctx_free(ctx); 655 icsk->icsk_ulp_data = NULL; 656 } 657 658 static int tls_hw_prot(struct sock *sk) 659 { 660 struct tls_context *ctx; 661 struct tls_device *dev; 662 int rc = 0; 663 664 spin_lock_bh(&device_spinlock); 665 list_for_each_entry(dev, &device_list, dev_list) { 666 if (dev->feature && dev->feature(dev)) { 667 ctx = create_ctx(sk); 668 if (!ctx) 669 goto out; 670 671 spin_unlock_bh(&device_spinlock); 672 tls_build_proto(sk); 673 ctx->hash = sk->sk_prot->hash; 674 ctx->unhash = sk->sk_prot->unhash; 675 ctx->sk_proto_close = sk->sk_prot->close; 676 ctx->sk_destruct = sk->sk_destruct; 677 sk->sk_destruct = tls_hw_sk_destruct; 678 ctx->rx_conf = TLS_HW_RECORD; 679 ctx->tx_conf = TLS_HW_RECORD; 680 update_sk_prot(sk, ctx); 681 spin_lock_bh(&device_spinlock); 682 rc = 1; 683 break; 684 } 685 } 686 out: 687 spin_unlock_bh(&device_spinlock); 688 return rc; 689 } 690 691 static void tls_hw_unhash(struct sock *sk) 692 { 693 struct tls_context *ctx = tls_get_ctx(sk); 694 struct tls_device *dev; 695 696 spin_lock_bh(&device_spinlock); 697 list_for_each_entry(dev, &device_list, dev_list) { 698 if (dev->unhash) { 699 kref_get(&dev->kref); 700 spin_unlock_bh(&device_spinlock); 701 dev->unhash(dev, sk); 702 kref_put(&dev->kref, dev->release); 703 spin_lock_bh(&device_spinlock); 704 } 705 } 706 spin_unlock_bh(&device_spinlock); 707 ctx->unhash(sk); 708 } 709 710 static int tls_hw_hash(struct sock *sk) 711 { 712 struct tls_context *ctx = tls_get_ctx(sk); 713 struct tls_device *dev; 714 int err; 715 716 err = ctx->hash(sk); 717 spin_lock_bh(&device_spinlock); 718 list_for_each_entry(dev, &device_list, dev_list) { 719 if (dev->hash) { 720 kref_get(&dev->kref); 721 spin_unlock_bh(&device_spinlock); 722 err |= dev->hash(dev, sk); 723 kref_put(&dev->kref, dev->release); 724 spin_lock_bh(&device_spinlock); 725 } 726 } 727 spin_unlock_bh(&device_spinlock); 728 729 if (err) 730 tls_hw_unhash(sk); 731 return err; 732 } 733 734 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], 735 struct proto *base) 736 { 737 prot[TLS_BASE][TLS_BASE] = *base; 738 prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; 739 prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; 740 prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; 741 742 prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; 743 prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; 744 prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; 745 746 prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; 747 prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; 748 prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read; 749 prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; 750 751 prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; 752 prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; 753 prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read; 754 prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; 755 756 #ifdef CONFIG_TLS_DEVICE 757 prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; 758 prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; 759 prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; 760 761 prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; 762 prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; 763 prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; 764 765 prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; 766 767 prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; 768 769 prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; 770 #endif 771 772 prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; 773 prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_hw_hash; 774 prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_hw_unhash; 775 } 776 777 static int tls_init(struct sock *sk) 778 { 779 struct tls_context *ctx; 780 int rc = 0; 781 782 if (tls_hw_prot(sk)) 783 return 0; 784 785 /* The TLS ulp is currently supported only for TCP sockets 786 * in ESTABLISHED state. 787 * Supporting sockets in LISTEN state will require us 788 * to modify the accept implementation to clone rather then 789 * share the ulp context. 790 */ 791 if (sk->sk_state != TCP_ESTABLISHED) 792 return -ENOTSUPP; 793 794 tls_build_proto(sk); 795 796 /* allocate tls context */ 797 write_lock_bh(&sk->sk_callback_lock); 798 ctx = create_ctx(sk); 799 if (!ctx) { 800 rc = -ENOMEM; 801 goto out; 802 } 803 804 ctx->tx_conf = TLS_BASE; 805 ctx->rx_conf = TLS_BASE; 806 ctx->sk_proto = sk->sk_prot; 807 update_sk_prot(sk, ctx); 808 out: 809 write_unlock_bh(&sk->sk_callback_lock); 810 return rc; 811 } 812 813 static void tls_update(struct sock *sk, struct proto *p) 814 { 815 struct tls_context *ctx; 816 817 ctx = tls_get_ctx(sk); 818 if (likely(ctx)) { 819 ctx->sk_proto_close = p->close; 820 ctx->sk_proto = p; 821 } else { 822 sk->sk_prot = p; 823 } 824 } 825 826 void tls_register_device(struct tls_device *device) 827 { 828 spin_lock_bh(&device_spinlock); 829 list_add_tail(&device->dev_list, &device_list); 830 spin_unlock_bh(&device_spinlock); 831 } 832 EXPORT_SYMBOL(tls_register_device); 833 834 void tls_unregister_device(struct tls_device *device) 835 { 836 spin_lock_bh(&device_spinlock); 837 list_del(&device->dev_list); 838 spin_unlock_bh(&device_spinlock); 839 } 840 EXPORT_SYMBOL(tls_unregister_device); 841 842 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { 843 .name = "tls", 844 .owner = THIS_MODULE, 845 .init = tls_init, 846 .update = tls_update, 847 }; 848 849 static int __init tls_register(void) 850 { 851 tls_sw_proto_ops = inet_stream_ops; 852 tls_sw_proto_ops.splice_read = tls_sw_splice_read; 853 854 #ifdef CONFIG_TLS_DEVICE 855 tls_device_init(); 856 #endif 857 tcp_register_ulp(&tcp_tls_ulp_ops); 858 859 return 0; 860 } 861 862 static void __exit tls_unregister(void) 863 { 864 tcp_unregister_ulp(&tcp_tls_ulp_ops); 865 #ifdef CONFIG_TLS_DEVICE 866 tls_device_cleanup(); 867 #endif 868 } 869 870 module_init(tls_register); 871 module_exit(tls_unregister); 872