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 #include <net/tls_toe.h> 46 47 MODULE_AUTHOR("Mellanox Technologies"); 48 MODULE_DESCRIPTION("Transport Layer Security Support"); 49 MODULE_LICENSE("Dual BSD/GPL"); 50 MODULE_ALIAS_TCP_ULP("tls"); 51 52 enum { 53 TLSV4, 54 TLSV6, 55 TLS_NUM_PROTS, 56 }; 57 58 static struct proto *saved_tcpv6_prot; 59 static DEFINE_MUTEX(tcpv6_prot_mutex); 60 static struct proto *saved_tcpv4_prot; 61 static DEFINE_MUTEX(tcpv4_prot_mutex); 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 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 /** 255 * tls_ctx_free() - free TLS ULP context 256 * @sk: socket to with @ctx is attached 257 * @ctx: TLS context structure 258 * 259 * Free TLS context. If @sk is %NULL caller guarantees that the socket 260 * to which @ctx was attached has no outstanding references. 261 */ 262 void tls_ctx_free(struct sock *sk, struct tls_context *ctx) 263 { 264 if (!ctx) 265 return; 266 267 memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); 268 memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); 269 270 if (sk) 271 kfree_rcu(ctx, rcu); 272 else 273 kfree(ctx); 274 } 275 276 static void tls_sk_proto_cleanup(struct sock *sk, 277 struct tls_context *ctx, long timeo) 278 { 279 if (unlikely(sk->sk_write_pending) && 280 !wait_on_pending_writer(sk, &timeo)) 281 tls_handle_open_record(sk, 0); 282 283 /* We need these for tls_sw_fallback handling of other packets */ 284 if (ctx->tx_conf == TLS_SW) { 285 kfree(ctx->tx.rec_seq); 286 kfree(ctx->tx.iv); 287 tls_sw_release_resources_tx(sk); 288 } else if (ctx->tx_conf == TLS_HW) { 289 tls_device_free_resources_tx(sk); 290 } 291 292 if (ctx->rx_conf == TLS_SW) 293 tls_sw_release_resources_rx(sk); 294 else if (ctx->rx_conf == TLS_HW) 295 tls_device_offload_cleanup_rx(sk); 296 } 297 298 static void tls_sk_proto_close(struct sock *sk, long timeout) 299 { 300 struct inet_connection_sock *icsk = inet_csk(sk); 301 struct tls_context *ctx = tls_get_ctx(sk); 302 long timeo = sock_sndtimeo(sk, 0); 303 bool free_ctx; 304 305 if (ctx->tx_conf == TLS_SW) 306 tls_sw_cancel_work_tx(ctx); 307 308 lock_sock(sk); 309 free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW; 310 311 if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE) 312 tls_sk_proto_cleanup(sk, ctx, timeo); 313 314 write_lock_bh(&sk->sk_callback_lock); 315 if (free_ctx) 316 rcu_assign_pointer(icsk->icsk_ulp_data, NULL); 317 sk->sk_prot = ctx->sk_proto; 318 if (sk->sk_write_space == tls_write_space) 319 sk->sk_write_space = ctx->sk_write_space; 320 write_unlock_bh(&sk->sk_callback_lock); 321 release_sock(sk); 322 if (ctx->tx_conf == TLS_SW) 323 tls_sw_free_ctx_tx(ctx); 324 if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) 325 tls_sw_strparser_done(ctx); 326 if (ctx->rx_conf == TLS_SW) 327 tls_sw_free_ctx_rx(ctx); 328 ctx->sk_proto->close(sk, timeout); 329 330 if (free_ctx) 331 tls_ctx_free(sk, ctx); 332 } 333 334 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval, 335 int __user *optlen) 336 { 337 int rc = 0; 338 struct tls_context *ctx = tls_get_ctx(sk); 339 struct tls_crypto_info *crypto_info; 340 int len; 341 342 if (get_user(len, optlen)) 343 return -EFAULT; 344 345 if (!optval || (len < sizeof(*crypto_info))) { 346 rc = -EINVAL; 347 goto out; 348 } 349 350 if (!ctx) { 351 rc = -EBUSY; 352 goto out; 353 } 354 355 /* get user crypto info */ 356 crypto_info = &ctx->crypto_send.info; 357 358 if (!TLS_CRYPTO_INFO_READY(crypto_info)) { 359 rc = -EBUSY; 360 goto out; 361 } 362 363 if (len == sizeof(*crypto_info)) { 364 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) 365 rc = -EFAULT; 366 goto out; 367 } 368 369 switch (crypto_info->cipher_type) { 370 case TLS_CIPHER_AES_GCM_128: { 371 struct tls12_crypto_info_aes_gcm_128 * 372 crypto_info_aes_gcm_128 = 373 container_of(crypto_info, 374 struct tls12_crypto_info_aes_gcm_128, 375 info); 376 377 if (len != sizeof(*crypto_info_aes_gcm_128)) { 378 rc = -EINVAL; 379 goto out; 380 } 381 lock_sock(sk); 382 memcpy(crypto_info_aes_gcm_128->iv, 383 ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, 384 TLS_CIPHER_AES_GCM_128_IV_SIZE); 385 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq, 386 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); 387 release_sock(sk); 388 if (copy_to_user(optval, 389 crypto_info_aes_gcm_128, 390 sizeof(*crypto_info_aes_gcm_128))) 391 rc = -EFAULT; 392 break; 393 } 394 case TLS_CIPHER_AES_GCM_256: { 395 struct tls12_crypto_info_aes_gcm_256 * 396 crypto_info_aes_gcm_256 = 397 container_of(crypto_info, 398 struct tls12_crypto_info_aes_gcm_256, 399 info); 400 401 if (len != sizeof(*crypto_info_aes_gcm_256)) { 402 rc = -EINVAL; 403 goto out; 404 } 405 lock_sock(sk); 406 memcpy(crypto_info_aes_gcm_256->iv, 407 ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE, 408 TLS_CIPHER_AES_GCM_256_IV_SIZE); 409 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq, 410 TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE); 411 release_sock(sk); 412 if (copy_to_user(optval, 413 crypto_info_aes_gcm_256, 414 sizeof(*crypto_info_aes_gcm_256))) 415 rc = -EFAULT; 416 break; 417 } 418 default: 419 rc = -EINVAL; 420 } 421 422 out: 423 return rc; 424 } 425 426 static int do_tls_getsockopt(struct sock *sk, int optname, 427 char __user *optval, int __user *optlen) 428 { 429 int rc = 0; 430 431 switch (optname) { 432 case TLS_TX: 433 rc = do_tls_getsockopt_tx(sk, optval, optlen); 434 break; 435 default: 436 rc = -ENOPROTOOPT; 437 break; 438 } 439 return rc; 440 } 441 442 static int tls_getsockopt(struct sock *sk, int level, int optname, 443 char __user *optval, int __user *optlen) 444 { 445 struct tls_context *ctx = tls_get_ctx(sk); 446 447 if (level != SOL_TLS) 448 return ctx->sk_proto->getsockopt(sk, level, 449 optname, optval, optlen); 450 451 return do_tls_getsockopt(sk, optname, optval, optlen); 452 } 453 454 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval, 455 unsigned int optlen, int tx) 456 { 457 struct tls_crypto_info *crypto_info; 458 struct tls_crypto_info *alt_crypto_info; 459 struct tls_context *ctx = tls_get_ctx(sk); 460 size_t optsize; 461 int rc = 0; 462 int conf; 463 464 if (!optval || (optlen < sizeof(*crypto_info))) { 465 rc = -EINVAL; 466 goto out; 467 } 468 469 if (tx) { 470 crypto_info = &ctx->crypto_send.info; 471 alt_crypto_info = &ctx->crypto_recv.info; 472 } else { 473 crypto_info = &ctx->crypto_recv.info; 474 alt_crypto_info = &ctx->crypto_send.info; 475 } 476 477 /* Currently we don't support set crypto info more than one time */ 478 if (TLS_CRYPTO_INFO_READY(crypto_info)) { 479 rc = -EBUSY; 480 goto out; 481 } 482 483 rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info)); 484 if (rc) { 485 rc = -EFAULT; 486 goto err_crypto_info; 487 } 488 489 /* check version */ 490 if (crypto_info->version != TLS_1_2_VERSION && 491 crypto_info->version != TLS_1_3_VERSION) { 492 rc = -ENOTSUPP; 493 goto err_crypto_info; 494 } 495 496 /* Ensure that TLS version and ciphers are same in both directions */ 497 if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) { 498 if (alt_crypto_info->version != crypto_info->version || 499 alt_crypto_info->cipher_type != crypto_info->cipher_type) { 500 rc = -EINVAL; 501 goto err_crypto_info; 502 } 503 } 504 505 switch (crypto_info->cipher_type) { 506 case TLS_CIPHER_AES_GCM_128: 507 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128); 508 break; 509 case TLS_CIPHER_AES_GCM_256: { 510 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256); 511 break; 512 } 513 case TLS_CIPHER_AES_CCM_128: 514 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128); 515 break; 516 default: 517 rc = -EINVAL; 518 goto err_crypto_info; 519 } 520 521 if (optlen != optsize) { 522 rc = -EINVAL; 523 goto err_crypto_info; 524 } 525 526 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info), 527 optlen - sizeof(*crypto_info)); 528 if (rc) { 529 rc = -EFAULT; 530 goto err_crypto_info; 531 } 532 533 if (tx) { 534 rc = tls_set_device_offload(sk, ctx); 535 conf = TLS_HW; 536 if (rc) { 537 rc = tls_set_sw_offload(sk, ctx, 1); 538 if (rc) 539 goto err_crypto_info; 540 conf = TLS_SW; 541 } 542 } else { 543 rc = tls_set_device_offload_rx(sk, ctx); 544 conf = TLS_HW; 545 if (rc) { 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->sk_proto->setsockopt(sk, level, optname, optval, 600 optlen); 601 602 return do_tls_setsockopt(sk, optname, optval, optlen); 603 } 604 605 struct tls_context *tls_ctx_create(struct sock *sk) 606 { 607 struct inet_connection_sock *icsk = inet_csk(sk); 608 struct tls_context *ctx; 609 610 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); 611 if (!ctx) 612 return NULL; 613 614 rcu_assign_pointer(icsk->icsk_ulp_data, ctx); 615 ctx->sk_proto = sk->sk_prot; 616 return ctx; 617 } 618 619 static void tls_build_proto(struct sock *sk) 620 { 621 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; 622 623 /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ 624 if (ip_ver == TLSV6 && 625 unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) { 626 mutex_lock(&tcpv6_prot_mutex); 627 if (likely(sk->sk_prot != saved_tcpv6_prot)) { 628 build_protos(tls_prots[TLSV6], sk->sk_prot); 629 smp_store_release(&saved_tcpv6_prot, sk->sk_prot); 630 } 631 mutex_unlock(&tcpv6_prot_mutex); 632 } 633 634 if (ip_ver == TLSV4 && 635 unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) { 636 mutex_lock(&tcpv4_prot_mutex); 637 if (likely(sk->sk_prot != saved_tcpv4_prot)) { 638 build_protos(tls_prots[TLSV4], sk->sk_prot); 639 smp_store_release(&saved_tcpv4_prot, sk->sk_prot); 640 } 641 mutex_unlock(&tcpv4_prot_mutex); 642 } 643 } 644 645 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], 646 struct proto *base) 647 { 648 prot[TLS_BASE][TLS_BASE] = *base; 649 prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; 650 prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; 651 prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; 652 653 prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; 654 prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; 655 prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; 656 657 prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; 658 prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; 659 prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read; 660 prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; 661 662 prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; 663 prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; 664 prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read; 665 prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; 666 667 #ifdef CONFIG_TLS_DEVICE 668 prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; 669 prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; 670 prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; 671 672 prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; 673 prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; 674 prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; 675 676 prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; 677 678 prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; 679 680 prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; 681 #endif 682 683 prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; 684 prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_hw_hash; 685 prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_hw_unhash; 686 } 687 688 static int tls_init(struct sock *sk) 689 { 690 struct tls_context *ctx; 691 int rc = 0; 692 693 tls_build_proto(sk); 694 695 if (tls_hw_prot(sk)) 696 return 0; 697 698 /* The TLS ulp is currently supported only for TCP sockets 699 * in ESTABLISHED state. 700 * Supporting sockets in LISTEN state will require us 701 * to modify the accept implementation to clone rather then 702 * share the ulp context. 703 */ 704 if (sk->sk_state != TCP_ESTABLISHED) 705 return -ENOTSUPP; 706 707 /* allocate tls context */ 708 write_lock_bh(&sk->sk_callback_lock); 709 ctx = tls_ctx_create(sk); 710 if (!ctx) { 711 rc = -ENOMEM; 712 goto out; 713 } 714 715 ctx->tx_conf = TLS_BASE; 716 ctx->rx_conf = TLS_BASE; 717 update_sk_prot(sk, ctx); 718 out: 719 write_unlock_bh(&sk->sk_callback_lock); 720 return rc; 721 } 722 723 static void tls_update(struct sock *sk, struct proto *p) 724 { 725 struct tls_context *ctx; 726 727 ctx = tls_get_ctx(sk); 728 if (likely(ctx)) 729 ctx->sk_proto = p; 730 else 731 sk->sk_prot = p; 732 } 733 734 static int tls_get_info(const struct sock *sk, struct sk_buff *skb) 735 { 736 u16 version, cipher_type; 737 struct tls_context *ctx; 738 struct nlattr *start; 739 int err; 740 741 start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS); 742 if (!start) 743 return -EMSGSIZE; 744 745 rcu_read_lock(); 746 ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data); 747 if (!ctx) { 748 err = 0; 749 goto nla_failure; 750 } 751 version = ctx->prot_info.version; 752 if (version) { 753 err = nla_put_u16(skb, TLS_INFO_VERSION, version); 754 if (err) 755 goto nla_failure; 756 } 757 cipher_type = ctx->prot_info.cipher_type; 758 if (cipher_type) { 759 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type); 760 if (err) 761 goto nla_failure; 762 } 763 err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true)); 764 if (err) 765 goto nla_failure; 766 767 err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false)); 768 if (err) 769 goto nla_failure; 770 771 rcu_read_unlock(); 772 nla_nest_end(skb, start); 773 return 0; 774 775 nla_failure: 776 rcu_read_unlock(); 777 nla_nest_cancel(skb, start); 778 return err; 779 } 780 781 static size_t tls_get_info_size(const struct sock *sk) 782 { 783 size_t size = 0; 784 785 size += nla_total_size(0) + /* INET_ULP_INFO_TLS */ 786 nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */ 787 nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */ 788 nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */ 789 nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */ 790 0; 791 792 return size; 793 } 794 795 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { 796 .name = "tls", 797 .owner = THIS_MODULE, 798 .init = tls_init, 799 .update = tls_update, 800 .get_info = tls_get_info, 801 .get_info_size = tls_get_info_size, 802 }; 803 804 static int __init tls_register(void) 805 { 806 tls_sw_proto_ops = inet_stream_ops; 807 tls_sw_proto_ops.splice_read = tls_sw_splice_read; 808 809 tls_device_init(); 810 tcp_register_ulp(&tcp_tls_ulp_ops); 811 812 return 0; 813 } 814 815 static void __exit tls_unregister(void) 816 { 817 tcp_unregister_ulp(&tcp_tls_ulp_ops); 818 tls_device_cleanup(); 819 } 820 821 module_init(tls_register); 822 module_exit(tls_unregister); 823