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 #include <linux/inet_diag.h> 43 44 #include <net/tls.h> 45 46 MODULE_AUTHOR("Mellanox Technologies"); 47 MODULE_DESCRIPTION("Transport Layer Security Support"); 48 MODULE_LICENSE("Dual BSD/GPL"); 49 MODULE_ALIAS_TCP_ULP("tls"); 50 51 enum { 52 TLSV4, 53 TLSV6, 54 TLS_NUM_PROTS, 55 }; 56 57 static struct proto *saved_tcpv6_prot; 58 static DEFINE_MUTEX(tcpv6_prot_mutex); 59 static struct proto *saved_tcpv4_prot; 60 static DEFINE_MUTEX(tcpv4_prot_mutex); 61 static LIST_HEAD(device_list); 62 static DEFINE_SPINLOCK(device_spinlock); 63 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG]; 64 static struct proto_ops tls_sw_proto_ops; 65 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], 66 struct proto *base); 67 68 static void update_sk_prot(struct sock *sk, struct tls_context *ctx) 69 { 70 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; 71 72 sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]; 73 } 74 75 int wait_on_pending_writer(struct sock *sk, long *timeo) 76 { 77 int rc = 0; 78 DEFINE_WAIT_FUNC(wait, woken_wake_function); 79 80 add_wait_queue(sk_sleep(sk), &wait); 81 while (1) { 82 if (!*timeo) { 83 rc = -EAGAIN; 84 break; 85 } 86 87 if (signal_pending(current)) { 88 rc = sock_intr_errno(*timeo); 89 break; 90 } 91 92 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait)) 93 break; 94 } 95 remove_wait_queue(sk_sleep(sk), &wait); 96 return rc; 97 } 98 99 int tls_push_sg(struct sock *sk, 100 struct tls_context *ctx, 101 struct scatterlist *sg, 102 u16 first_offset, 103 int flags) 104 { 105 int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST; 106 int ret = 0; 107 struct page *p; 108 size_t size; 109 int offset = first_offset; 110 111 size = sg->length - offset; 112 offset += sg->offset; 113 114 ctx->in_tcp_sendpages = true; 115 while (1) { 116 if (sg_is_last(sg)) 117 sendpage_flags = flags; 118 119 /* is sending application-limited? */ 120 tcp_rate_check_app_limited(sk); 121 p = sg_page(sg); 122 retry: 123 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags); 124 125 if (ret != size) { 126 if (ret > 0) { 127 offset += ret; 128 size -= ret; 129 goto retry; 130 } 131 132 offset -= sg->offset; 133 ctx->partially_sent_offset = offset; 134 ctx->partially_sent_record = (void *)sg; 135 ctx->in_tcp_sendpages = false; 136 return ret; 137 } 138 139 put_page(p); 140 sk_mem_uncharge(sk, sg->length); 141 sg = sg_next(sg); 142 if (!sg) 143 break; 144 145 offset = sg->offset; 146 size = sg->length; 147 } 148 149 ctx->in_tcp_sendpages = false; 150 151 return 0; 152 } 153 154 static int tls_handle_open_record(struct sock *sk, int flags) 155 { 156 struct tls_context *ctx = tls_get_ctx(sk); 157 158 if (tls_is_pending_open_record(ctx)) 159 return ctx->push_pending_record(sk, flags); 160 161 return 0; 162 } 163 164 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, 165 unsigned char *record_type) 166 { 167 struct cmsghdr *cmsg; 168 int rc = -EINVAL; 169 170 for_each_cmsghdr(cmsg, msg) { 171 if (!CMSG_OK(msg, cmsg)) 172 return -EINVAL; 173 if (cmsg->cmsg_level != SOL_TLS) 174 continue; 175 176 switch (cmsg->cmsg_type) { 177 case TLS_SET_RECORD_TYPE: 178 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type))) 179 return -EINVAL; 180 181 if (msg->msg_flags & MSG_MORE) 182 return -EINVAL; 183 184 rc = tls_handle_open_record(sk, msg->msg_flags); 185 if (rc) 186 return rc; 187 188 *record_type = *(unsigned char *)CMSG_DATA(cmsg); 189 rc = 0; 190 break; 191 default: 192 return -EINVAL; 193 } 194 } 195 196 return rc; 197 } 198 199 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, 200 int flags) 201 { 202 struct scatterlist *sg; 203 u16 offset; 204 205 sg = ctx->partially_sent_record; 206 offset = ctx->partially_sent_offset; 207 208 ctx->partially_sent_record = NULL; 209 return tls_push_sg(sk, ctx, sg, offset, flags); 210 } 211 212 bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx) 213 { 214 struct scatterlist *sg; 215 216 sg = ctx->partially_sent_record; 217 if (!sg) 218 return false; 219 220 while (1) { 221 put_page(sg_page(sg)); 222 sk_mem_uncharge(sk, sg->length); 223 224 if (sg_is_last(sg)) 225 break; 226 sg++; 227 } 228 ctx->partially_sent_record = NULL; 229 return true; 230 } 231 232 static void tls_write_space(struct sock *sk) 233 { 234 struct tls_context *ctx = tls_get_ctx(sk); 235 236 /* If in_tcp_sendpages call lower protocol write space handler 237 * to ensure we wake up any waiting operations there. For example 238 * if do_tcp_sendpages where to call sk_wait_event. 239 */ 240 if (ctx->in_tcp_sendpages) { 241 ctx->sk_write_space(sk); 242 return; 243 } 244 245 #ifdef CONFIG_TLS_DEVICE 246 if (ctx->tx_conf == TLS_HW) 247 tls_device_write_space(sk, ctx); 248 else 249 #endif 250 tls_sw_write_space(sk, ctx); 251 252 ctx->sk_write_space(sk); 253 } 254 255 /** 256 * tls_ctx_free() - free TLS ULP context 257 * @sk: socket to with @ctx is attached 258 * @ctx: TLS context structure 259 * 260 * Free TLS context. If @sk is %NULL caller guarantees that the socket 261 * to which @ctx was attached has no outstanding references. 262 */ 263 void tls_ctx_free(struct sock *sk, struct tls_context *ctx) 264 { 265 if (!ctx) 266 return; 267 268 memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); 269 memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); 270 mutex_destroy(&ctx->tx_lock); 271 272 if (sk) 273 kfree_rcu(ctx, rcu); 274 else 275 kfree(ctx); 276 } 277 278 static void tls_sk_proto_cleanup(struct sock *sk, 279 struct tls_context *ctx, long timeo) 280 { 281 if (unlikely(sk->sk_write_pending) && 282 !wait_on_pending_writer(sk, &timeo)) 283 tls_handle_open_record(sk, 0); 284 285 /* We need these for tls_sw_fallback handling of other packets */ 286 if (ctx->tx_conf == TLS_SW) { 287 kfree(ctx->tx.rec_seq); 288 kfree(ctx->tx.iv); 289 tls_sw_release_resources_tx(sk); 290 } else if (ctx->tx_conf == TLS_HW) { 291 tls_device_free_resources_tx(sk); 292 } 293 294 if (ctx->rx_conf == TLS_SW) 295 tls_sw_release_resources_rx(sk); 296 else if (ctx->rx_conf == TLS_HW) 297 tls_device_offload_cleanup_rx(sk); 298 } 299 300 static void tls_sk_proto_close(struct sock *sk, long timeout) 301 { 302 struct inet_connection_sock *icsk = inet_csk(sk); 303 struct tls_context *ctx = tls_get_ctx(sk); 304 long timeo = sock_sndtimeo(sk, 0); 305 bool free_ctx; 306 307 if (ctx->tx_conf == TLS_SW) 308 tls_sw_cancel_work_tx(ctx); 309 310 lock_sock(sk); 311 free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW; 312 313 if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE) 314 tls_sk_proto_cleanup(sk, ctx, timeo); 315 316 write_lock_bh(&sk->sk_callback_lock); 317 if (free_ctx) 318 rcu_assign_pointer(icsk->icsk_ulp_data, NULL); 319 sk->sk_prot = ctx->sk_proto; 320 if (sk->sk_write_space == tls_write_space) 321 sk->sk_write_space = ctx->sk_write_space; 322 write_unlock_bh(&sk->sk_callback_lock); 323 release_sock(sk); 324 if (ctx->tx_conf == TLS_SW) 325 tls_sw_free_ctx_tx(ctx); 326 if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) 327 tls_sw_strparser_done(ctx); 328 if (ctx->rx_conf == TLS_SW) 329 tls_sw_free_ctx_rx(ctx); 330 ctx->sk_proto->close(sk, timeout); 331 332 if (free_ctx) 333 tls_ctx_free(sk, ctx); 334 } 335 336 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval, 337 int __user *optlen) 338 { 339 int rc = 0; 340 struct tls_context *ctx = tls_get_ctx(sk); 341 struct tls_crypto_info *crypto_info; 342 int len; 343 344 if (get_user(len, optlen)) 345 return -EFAULT; 346 347 if (!optval || (len < sizeof(*crypto_info))) { 348 rc = -EINVAL; 349 goto out; 350 } 351 352 if (!ctx) { 353 rc = -EBUSY; 354 goto out; 355 } 356 357 /* get user crypto info */ 358 crypto_info = &ctx->crypto_send.info; 359 360 if (!TLS_CRYPTO_INFO_READY(crypto_info)) { 361 rc = -EBUSY; 362 goto out; 363 } 364 365 if (len == sizeof(*crypto_info)) { 366 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) 367 rc = -EFAULT; 368 goto out; 369 } 370 371 switch (crypto_info->cipher_type) { 372 case TLS_CIPHER_AES_GCM_128: { 373 struct tls12_crypto_info_aes_gcm_128 * 374 crypto_info_aes_gcm_128 = 375 container_of(crypto_info, 376 struct tls12_crypto_info_aes_gcm_128, 377 info); 378 379 if (len != sizeof(*crypto_info_aes_gcm_128)) { 380 rc = -EINVAL; 381 goto out; 382 } 383 lock_sock(sk); 384 memcpy(crypto_info_aes_gcm_128->iv, 385 ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, 386 TLS_CIPHER_AES_GCM_128_IV_SIZE); 387 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq, 388 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); 389 release_sock(sk); 390 if (copy_to_user(optval, 391 crypto_info_aes_gcm_128, 392 sizeof(*crypto_info_aes_gcm_128))) 393 rc = -EFAULT; 394 break; 395 } 396 case TLS_CIPHER_AES_GCM_256: { 397 struct tls12_crypto_info_aes_gcm_256 * 398 crypto_info_aes_gcm_256 = 399 container_of(crypto_info, 400 struct tls12_crypto_info_aes_gcm_256, 401 info); 402 403 if (len != sizeof(*crypto_info_aes_gcm_256)) { 404 rc = -EINVAL; 405 goto out; 406 } 407 lock_sock(sk); 408 memcpy(crypto_info_aes_gcm_256->iv, 409 ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE, 410 TLS_CIPHER_AES_GCM_256_IV_SIZE); 411 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq, 412 TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE); 413 release_sock(sk); 414 if (copy_to_user(optval, 415 crypto_info_aes_gcm_256, 416 sizeof(*crypto_info_aes_gcm_256))) 417 rc = -EFAULT; 418 break; 419 } 420 default: 421 rc = -EINVAL; 422 } 423 424 out: 425 return rc; 426 } 427 428 static int do_tls_getsockopt(struct sock *sk, int optname, 429 char __user *optval, int __user *optlen) 430 { 431 int rc = 0; 432 433 switch (optname) { 434 case TLS_TX: 435 rc = do_tls_getsockopt_tx(sk, optval, optlen); 436 break; 437 default: 438 rc = -ENOPROTOOPT; 439 break; 440 } 441 return rc; 442 } 443 444 static int tls_getsockopt(struct sock *sk, int level, int optname, 445 char __user *optval, int __user *optlen) 446 { 447 struct tls_context *ctx = tls_get_ctx(sk); 448 449 if (level != SOL_TLS) 450 return ctx->sk_proto->getsockopt(sk, level, 451 optname, optval, optlen); 452 453 return do_tls_getsockopt(sk, optname, optval, optlen); 454 } 455 456 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval, 457 unsigned int optlen, int tx) 458 { 459 struct tls_crypto_info *crypto_info; 460 struct tls_crypto_info *alt_crypto_info; 461 struct tls_context *ctx = tls_get_ctx(sk); 462 size_t optsize; 463 int rc = 0; 464 int conf; 465 466 if (!optval || (optlen < sizeof(*crypto_info))) { 467 rc = -EINVAL; 468 goto out; 469 } 470 471 if (tx) { 472 crypto_info = &ctx->crypto_send.info; 473 alt_crypto_info = &ctx->crypto_recv.info; 474 } else { 475 crypto_info = &ctx->crypto_recv.info; 476 alt_crypto_info = &ctx->crypto_send.info; 477 } 478 479 /* Currently we don't support set crypto info more than one time */ 480 if (TLS_CRYPTO_INFO_READY(crypto_info)) { 481 rc = -EBUSY; 482 goto out; 483 } 484 485 rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info)); 486 if (rc) { 487 rc = -EFAULT; 488 goto err_crypto_info; 489 } 490 491 /* check version */ 492 if (crypto_info->version != TLS_1_2_VERSION && 493 crypto_info->version != TLS_1_3_VERSION) { 494 rc = -ENOTSUPP; 495 goto err_crypto_info; 496 } 497 498 /* Ensure that TLS version and ciphers are same in both directions */ 499 if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) { 500 if (alt_crypto_info->version != crypto_info->version || 501 alt_crypto_info->cipher_type != crypto_info->cipher_type) { 502 rc = -EINVAL; 503 goto err_crypto_info; 504 } 505 } 506 507 switch (crypto_info->cipher_type) { 508 case TLS_CIPHER_AES_GCM_128: 509 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128); 510 break; 511 case TLS_CIPHER_AES_GCM_256: { 512 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256); 513 break; 514 } 515 case TLS_CIPHER_AES_CCM_128: 516 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128); 517 break; 518 default: 519 rc = -EINVAL; 520 goto err_crypto_info; 521 } 522 523 if (optlen != optsize) { 524 rc = -EINVAL; 525 goto err_crypto_info; 526 } 527 528 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info), 529 optlen - sizeof(*crypto_info)); 530 if (rc) { 531 rc = -EFAULT; 532 goto err_crypto_info; 533 } 534 535 if (tx) { 536 rc = tls_set_device_offload(sk, ctx); 537 conf = TLS_HW; 538 if (rc) { 539 rc = tls_set_sw_offload(sk, ctx, 1); 540 if (rc) 541 goto err_crypto_info; 542 conf = TLS_SW; 543 } 544 } else { 545 rc = tls_set_device_offload_rx(sk, ctx); 546 conf = TLS_HW; 547 if (rc) { 548 rc = tls_set_sw_offload(sk, ctx, 0); 549 if (rc) 550 goto err_crypto_info; 551 conf = TLS_SW; 552 } 553 tls_sw_strparser_arm(sk, ctx); 554 } 555 556 if (tx) 557 ctx->tx_conf = conf; 558 else 559 ctx->rx_conf = conf; 560 update_sk_prot(sk, ctx); 561 if (tx) { 562 ctx->sk_write_space = sk->sk_write_space; 563 sk->sk_write_space = tls_write_space; 564 } else { 565 sk->sk_socket->ops = &tls_sw_proto_ops; 566 } 567 goto out; 568 569 err_crypto_info: 570 memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); 571 out: 572 return rc; 573 } 574 575 static int do_tls_setsockopt(struct sock *sk, int optname, 576 char __user *optval, unsigned int optlen) 577 { 578 int rc = 0; 579 580 switch (optname) { 581 case TLS_TX: 582 case TLS_RX: 583 lock_sock(sk); 584 rc = do_tls_setsockopt_conf(sk, optval, optlen, 585 optname == TLS_TX); 586 release_sock(sk); 587 break; 588 default: 589 rc = -ENOPROTOOPT; 590 break; 591 } 592 return rc; 593 } 594 595 static int tls_setsockopt(struct sock *sk, int level, int optname, 596 char __user *optval, unsigned int optlen) 597 { 598 struct tls_context *ctx = tls_get_ctx(sk); 599 600 if (level != SOL_TLS) 601 return ctx->sk_proto->setsockopt(sk, level, optname, optval, 602 optlen); 603 604 return do_tls_setsockopt(sk, optname, optval, optlen); 605 } 606 607 static struct tls_context *create_ctx(struct sock *sk) 608 { 609 struct inet_connection_sock *icsk = inet_csk(sk); 610 struct tls_context *ctx; 611 612 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); 613 if (!ctx) 614 return NULL; 615 616 mutex_init(&ctx->tx_lock); 617 rcu_assign_pointer(icsk->icsk_ulp_data, ctx); 618 ctx->sk_proto = sk->sk_prot; 619 return ctx; 620 } 621 622 static void tls_build_proto(struct sock *sk) 623 { 624 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; 625 626 /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ 627 if (ip_ver == TLSV6 && 628 unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) { 629 mutex_lock(&tcpv6_prot_mutex); 630 if (likely(sk->sk_prot != saved_tcpv6_prot)) { 631 build_protos(tls_prots[TLSV6], sk->sk_prot); 632 smp_store_release(&saved_tcpv6_prot, sk->sk_prot); 633 } 634 mutex_unlock(&tcpv6_prot_mutex); 635 } 636 637 if (ip_ver == TLSV4 && 638 unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) { 639 mutex_lock(&tcpv4_prot_mutex); 640 if (likely(sk->sk_prot != saved_tcpv4_prot)) { 641 build_protos(tls_prots[TLSV4], sk->sk_prot); 642 smp_store_release(&saved_tcpv4_prot, sk->sk_prot); 643 } 644 mutex_unlock(&tcpv4_prot_mutex); 645 } 646 } 647 648 static void tls_hw_sk_destruct(struct sock *sk) 649 { 650 struct tls_context *ctx = tls_get_ctx(sk); 651 struct inet_connection_sock *icsk = inet_csk(sk); 652 653 ctx->sk_destruct(sk); 654 /* Free ctx */ 655 rcu_assign_pointer(icsk->icsk_ulp_data, NULL); 656 tls_ctx_free(sk, ctx); 657 } 658 659 static int tls_hw_prot(struct sock *sk) 660 { 661 struct tls_context *ctx; 662 struct tls_device *dev; 663 int rc = 0; 664 665 spin_lock_bh(&device_spinlock); 666 list_for_each_entry(dev, &device_list, dev_list) { 667 if (dev->feature && dev->feature(dev)) { 668 ctx = create_ctx(sk); 669 if (!ctx) 670 goto out; 671 672 spin_unlock_bh(&device_spinlock); 673 tls_build_proto(sk); 674 ctx->sk_destruct = sk->sk_destruct; 675 sk->sk_destruct = tls_hw_sk_destruct; 676 ctx->rx_conf = TLS_HW_RECORD; 677 ctx->tx_conf = TLS_HW_RECORD; 678 update_sk_prot(sk, ctx); 679 spin_lock_bh(&device_spinlock); 680 rc = 1; 681 break; 682 } 683 } 684 out: 685 spin_unlock_bh(&device_spinlock); 686 return rc; 687 } 688 689 static void tls_hw_unhash(struct sock *sk) 690 { 691 struct tls_context *ctx = tls_get_ctx(sk); 692 struct tls_device *dev; 693 694 spin_lock_bh(&device_spinlock); 695 list_for_each_entry(dev, &device_list, dev_list) { 696 if (dev->unhash) { 697 kref_get(&dev->kref); 698 spin_unlock_bh(&device_spinlock); 699 dev->unhash(dev, sk); 700 kref_put(&dev->kref, dev->release); 701 spin_lock_bh(&device_spinlock); 702 } 703 } 704 spin_unlock_bh(&device_spinlock); 705 ctx->sk_proto->unhash(sk); 706 } 707 708 static int tls_hw_hash(struct sock *sk) 709 { 710 struct tls_context *ctx = tls_get_ctx(sk); 711 struct tls_device *dev; 712 int err; 713 714 err = ctx->sk_proto->hash(sk); 715 spin_lock_bh(&device_spinlock); 716 list_for_each_entry(dev, &device_list, dev_list) { 717 if (dev->hash) { 718 kref_get(&dev->kref); 719 spin_unlock_bh(&device_spinlock); 720 err |= dev->hash(dev, sk); 721 kref_put(&dev->kref, dev->release); 722 spin_lock_bh(&device_spinlock); 723 } 724 } 725 spin_unlock_bh(&device_spinlock); 726 727 if (err) 728 tls_hw_unhash(sk); 729 return err; 730 } 731 732 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], 733 struct proto *base) 734 { 735 prot[TLS_BASE][TLS_BASE] = *base; 736 prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; 737 prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; 738 prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; 739 740 prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; 741 prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; 742 prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; 743 744 prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; 745 prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; 746 prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read; 747 prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; 748 749 prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; 750 prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; 751 prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read; 752 prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; 753 754 #ifdef CONFIG_TLS_DEVICE 755 prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; 756 prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; 757 prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; 758 759 prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; 760 prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; 761 prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; 762 763 prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; 764 765 prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; 766 767 prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; 768 #endif 769 770 prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; 771 prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_hw_hash; 772 prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_hw_unhash; 773 } 774 775 static int tls_init(struct sock *sk) 776 { 777 struct tls_context *ctx; 778 int rc = 0; 779 780 if (tls_hw_prot(sk)) 781 return 0; 782 783 /* The TLS ulp is currently supported only for TCP sockets 784 * in ESTABLISHED state. 785 * Supporting sockets in LISTEN state will require us 786 * to modify the accept implementation to clone rather then 787 * share the ulp context. 788 */ 789 if (sk->sk_state != TCP_ESTABLISHED) 790 return -ENOTSUPP; 791 792 tls_build_proto(sk); 793 794 /* allocate tls context */ 795 write_lock_bh(&sk->sk_callback_lock); 796 ctx = create_ctx(sk); 797 if (!ctx) { 798 rc = -ENOMEM; 799 goto out; 800 } 801 802 ctx->tx_conf = TLS_BASE; 803 ctx->rx_conf = TLS_BASE; 804 update_sk_prot(sk, ctx); 805 out: 806 write_unlock_bh(&sk->sk_callback_lock); 807 return rc; 808 } 809 810 static void tls_update(struct sock *sk, struct proto *p) 811 { 812 struct tls_context *ctx; 813 814 ctx = tls_get_ctx(sk); 815 if (likely(ctx)) 816 ctx->sk_proto = p; 817 else 818 sk->sk_prot = p; 819 } 820 821 static int tls_get_info(const struct sock *sk, struct sk_buff *skb) 822 { 823 u16 version, cipher_type; 824 struct tls_context *ctx; 825 struct nlattr *start; 826 int err; 827 828 start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS); 829 if (!start) 830 return -EMSGSIZE; 831 832 rcu_read_lock(); 833 ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data); 834 if (!ctx) { 835 err = 0; 836 goto nla_failure; 837 } 838 version = ctx->prot_info.version; 839 if (version) { 840 err = nla_put_u16(skb, TLS_INFO_VERSION, version); 841 if (err) 842 goto nla_failure; 843 } 844 cipher_type = ctx->prot_info.cipher_type; 845 if (cipher_type) { 846 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type); 847 if (err) 848 goto nla_failure; 849 } 850 err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true)); 851 if (err) 852 goto nla_failure; 853 854 err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false)); 855 if (err) 856 goto nla_failure; 857 858 rcu_read_unlock(); 859 nla_nest_end(skb, start); 860 return 0; 861 862 nla_failure: 863 rcu_read_unlock(); 864 nla_nest_cancel(skb, start); 865 return err; 866 } 867 868 static size_t tls_get_info_size(const struct sock *sk) 869 { 870 size_t size = 0; 871 872 size += nla_total_size(0) + /* INET_ULP_INFO_TLS */ 873 nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */ 874 nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */ 875 nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */ 876 nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */ 877 0; 878 879 return size; 880 } 881 882 void tls_register_device(struct tls_device *device) 883 { 884 spin_lock_bh(&device_spinlock); 885 list_add_tail(&device->dev_list, &device_list); 886 spin_unlock_bh(&device_spinlock); 887 } 888 EXPORT_SYMBOL(tls_register_device); 889 890 void tls_unregister_device(struct tls_device *device) 891 { 892 spin_lock_bh(&device_spinlock); 893 list_del(&device->dev_list); 894 spin_unlock_bh(&device_spinlock); 895 } 896 EXPORT_SYMBOL(tls_unregister_device); 897 898 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { 899 .name = "tls", 900 .owner = THIS_MODULE, 901 .init = tls_init, 902 .update = tls_update, 903 .get_info = tls_get_info, 904 .get_info_size = tls_get_info_size, 905 }; 906 907 static int __init tls_register(void) 908 { 909 tls_sw_proto_ops = inet_stream_ops; 910 tls_sw_proto_ops.splice_read = tls_sw_splice_read; 911 912 tls_device_init(); 913 tcp_register_ulp(&tcp_tls_ulp_ops); 914 915 return 0; 916 } 917 918 static void __exit tls_unregister(void) 919 { 920 tcp_unregister_ulp(&tcp_tls_ulp_ops); 921 tls_device_cleanup(); 922 } 923 924 module_init(tls_register); 925 module_exit(tls_unregister); 926