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/snmp.h> 45 #include <net/tls.h> 46 #include <net/tls_toe.h> 47 48 MODULE_AUTHOR("Mellanox Technologies"); 49 MODULE_DESCRIPTION("Transport Layer Security Support"); 50 MODULE_LICENSE("Dual BSD/GPL"); 51 MODULE_ALIAS_TCP_ULP("tls"); 52 53 enum { 54 TLSV4, 55 TLSV6, 56 TLS_NUM_PROTS, 57 }; 58 59 static const struct proto *saved_tcpv6_prot; 60 static DEFINE_MUTEX(tcpv6_prot_mutex); 61 static const struct proto *saved_tcpv4_prot; 62 static DEFINE_MUTEX(tcpv4_prot_mutex); 63 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG]; 64 static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG]; 65 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], 66 const struct proto *base); 67 68 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 WRITE_ONCE(sk->sk_prot, 73 &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]); 74 WRITE_ONCE(sk->sk_socket->ops, 75 &tls_proto_ops[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 ctx->in_tcp_sendpages = false; 139 return ret; 140 } 141 142 put_page(p); 143 sk_mem_uncharge(sk, sg->length); 144 sg = sg_next(sg); 145 if (!sg) 146 break; 147 148 offset = sg->offset; 149 size = sg->length; 150 } 151 152 ctx->in_tcp_sendpages = false; 153 154 return 0; 155 } 156 157 static int tls_handle_open_record(struct sock *sk, int flags) 158 { 159 struct tls_context *ctx = tls_get_ctx(sk); 160 161 if (tls_is_pending_open_record(ctx)) 162 return ctx->push_pending_record(sk, flags); 163 164 return 0; 165 } 166 167 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, 168 unsigned char *record_type) 169 { 170 struct cmsghdr *cmsg; 171 int rc = -EINVAL; 172 173 for_each_cmsghdr(cmsg, msg) { 174 if (!CMSG_OK(msg, cmsg)) 175 return -EINVAL; 176 if (cmsg->cmsg_level != SOL_TLS) 177 continue; 178 179 switch (cmsg->cmsg_type) { 180 case TLS_SET_RECORD_TYPE: 181 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type))) 182 return -EINVAL; 183 184 if (msg->msg_flags & MSG_MORE) 185 return -EINVAL; 186 187 rc = tls_handle_open_record(sk, msg->msg_flags); 188 if (rc) 189 return rc; 190 191 *record_type = *(unsigned char *)CMSG_DATA(cmsg); 192 rc = 0; 193 break; 194 default: 195 return -EINVAL; 196 } 197 } 198 199 return rc; 200 } 201 202 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx, 203 int flags) 204 { 205 struct scatterlist *sg; 206 u16 offset; 207 208 sg = ctx->partially_sent_record; 209 offset = ctx->partially_sent_offset; 210 211 ctx->partially_sent_record = NULL; 212 return tls_push_sg(sk, ctx, sg, offset, flags); 213 } 214 215 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx) 216 { 217 struct scatterlist *sg; 218 219 for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) { 220 put_page(sg_page(sg)); 221 sk_mem_uncharge(sk, sg->length); 222 } 223 ctx->partially_sent_record = NULL; 224 } 225 226 static void tls_write_space(struct sock *sk) 227 { 228 struct tls_context *ctx = tls_get_ctx(sk); 229 230 /* If in_tcp_sendpages call lower protocol write space handler 231 * to ensure we wake up any waiting operations there. For example 232 * if do_tcp_sendpages where to call sk_wait_event. 233 */ 234 if (ctx->in_tcp_sendpages) { 235 ctx->sk_write_space(sk); 236 return; 237 } 238 239 #ifdef CONFIG_TLS_DEVICE 240 if (ctx->tx_conf == TLS_HW) 241 tls_device_write_space(sk, ctx); 242 else 243 #endif 244 tls_sw_write_space(sk, ctx); 245 246 ctx->sk_write_space(sk); 247 } 248 249 /** 250 * tls_ctx_free() - free TLS ULP context 251 * @sk: socket to with @ctx is attached 252 * @ctx: TLS context structure 253 * 254 * Free TLS context. If @sk is %NULL caller guarantees that the socket 255 * to which @ctx was attached has no outstanding references. 256 */ 257 void tls_ctx_free(struct sock *sk, struct tls_context *ctx) 258 { 259 if (!ctx) 260 return; 261 262 memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send)); 263 memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv)); 264 mutex_destroy(&ctx->tx_lock); 265 266 if (sk) 267 kfree_rcu(ctx, rcu); 268 else 269 kfree(ctx); 270 } 271 272 static void tls_sk_proto_cleanup(struct sock *sk, 273 struct tls_context *ctx, long timeo) 274 { 275 if (unlikely(sk->sk_write_pending) && 276 !wait_on_pending_writer(sk, &timeo)) 277 tls_handle_open_record(sk, 0); 278 279 /* We need these for tls_sw_fallback handling of other packets */ 280 if (ctx->tx_conf == TLS_SW) { 281 kfree(ctx->tx.rec_seq); 282 kfree(ctx->tx.iv); 283 tls_sw_release_resources_tx(sk); 284 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW); 285 } else if (ctx->tx_conf == TLS_HW) { 286 tls_device_free_resources_tx(sk); 287 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE); 288 } 289 290 if (ctx->rx_conf == TLS_SW) { 291 tls_sw_release_resources_rx(sk); 292 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW); 293 } else if (ctx->rx_conf == TLS_HW) { 294 tls_device_offload_cleanup_rx(sk); 295 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE); 296 } 297 } 298 299 static void tls_sk_proto_close(struct sock *sk, long timeout) 300 { 301 struct inet_connection_sock *icsk = inet_csk(sk); 302 struct tls_context *ctx = tls_get_ctx(sk); 303 long timeo = sock_sndtimeo(sk, 0); 304 bool free_ctx; 305 306 if (ctx->tx_conf == TLS_SW) 307 tls_sw_cancel_work_tx(ctx); 308 309 lock_sock(sk); 310 free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW; 311 312 if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE) 313 tls_sk_proto_cleanup(sk, ctx, timeo); 314 315 write_lock_bh(&sk->sk_callback_lock); 316 if (free_ctx) 317 rcu_assign_pointer(icsk->icsk_ulp_data, NULL); 318 WRITE_ONCE(sk->sk_prot, ctx->sk_proto); 319 if (sk->sk_write_space == tls_write_space) 320 sk->sk_write_space = ctx->sk_write_space; 321 write_unlock_bh(&sk->sk_callback_lock); 322 release_sock(sk); 323 if (ctx->tx_conf == TLS_SW) 324 tls_sw_free_ctx_tx(ctx); 325 if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) 326 tls_sw_strparser_done(ctx); 327 if (ctx->rx_conf == TLS_SW) 328 tls_sw_free_ctx_rx(ctx); 329 ctx->sk_proto->close(sk, timeout); 330 331 if (free_ctx) 332 tls_ctx_free(sk, ctx); 333 } 334 335 static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval, 336 int __user *optlen, int tx) 337 { 338 int rc = 0; 339 struct tls_context *ctx = tls_get_ctx(sk); 340 struct tls_crypto_info *crypto_info; 341 struct cipher_context *cctx; 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 if (tx) { 359 crypto_info = &ctx->crypto_send.info; 360 cctx = &ctx->tx; 361 } else { 362 crypto_info = &ctx->crypto_recv.info; 363 cctx = &ctx->rx; 364 } 365 366 if (!TLS_CRYPTO_INFO_READY(crypto_info)) { 367 rc = -EBUSY; 368 goto out; 369 } 370 371 if (len == sizeof(*crypto_info)) { 372 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info))) 373 rc = -EFAULT; 374 goto out; 375 } 376 377 switch (crypto_info->cipher_type) { 378 case TLS_CIPHER_AES_GCM_128: { 379 struct tls12_crypto_info_aes_gcm_128 * 380 crypto_info_aes_gcm_128 = 381 container_of(crypto_info, 382 struct tls12_crypto_info_aes_gcm_128, 383 info); 384 385 if (len != sizeof(*crypto_info_aes_gcm_128)) { 386 rc = -EINVAL; 387 goto out; 388 } 389 lock_sock(sk); 390 memcpy(crypto_info_aes_gcm_128->iv, 391 cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, 392 TLS_CIPHER_AES_GCM_128_IV_SIZE); 393 memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq, 394 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE); 395 release_sock(sk); 396 if (copy_to_user(optval, 397 crypto_info_aes_gcm_128, 398 sizeof(*crypto_info_aes_gcm_128))) 399 rc = -EFAULT; 400 break; 401 } 402 case TLS_CIPHER_AES_GCM_256: { 403 struct tls12_crypto_info_aes_gcm_256 * 404 crypto_info_aes_gcm_256 = 405 container_of(crypto_info, 406 struct tls12_crypto_info_aes_gcm_256, 407 info); 408 409 if (len != sizeof(*crypto_info_aes_gcm_256)) { 410 rc = -EINVAL; 411 goto out; 412 } 413 lock_sock(sk); 414 memcpy(crypto_info_aes_gcm_256->iv, 415 cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE, 416 TLS_CIPHER_AES_GCM_256_IV_SIZE); 417 memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq, 418 TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE); 419 release_sock(sk); 420 if (copy_to_user(optval, 421 crypto_info_aes_gcm_256, 422 sizeof(*crypto_info_aes_gcm_256))) 423 rc = -EFAULT; 424 break; 425 } 426 default: 427 rc = -EINVAL; 428 } 429 430 out: 431 return rc; 432 } 433 434 static int do_tls_getsockopt(struct sock *sk, int optname, 435 char __user *optval, int __user *optlen) 436 { 437 int rc = 0; 438 439 switch (optname) { 440 case TLS_TX: 441 case TLS_RX: 442 rc = do_tls_getsockopt_conf(sk, optval, optlen, 443 optname == TLS_TX); 444 break; 445 default: 446 rc = -ENOPROTOOPT; 447 break; 448 } 449 return rc; 450 } 451 452 static int tls_getsockopt(struct sock *sk, int level, int optname, 453 char __user *optval, int __user *optlen) 454 { 455 struct tls_context *ctx = tls_get_ctx(sk); 456 457 if (level != SOL_TLS) 458 return ctx->sk_proto->getsockopt(sk, level, 459 optname, optval, optlen); 460 461 return do_tls_getsockopt(sk, optname, optval, optlen); 462 } 463 464 static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval, 465 unsigned int optlen, int tx) 466 { 467 struct tls_crypto_info *crypto_info; 468 struct tls_crypto_info *alt_crypto_info; 469 struct tls_context *ctx = tls_get_ctx(sk); 470 size_t optsize; 471 int rc = 0; 472 int conf; 473 474 if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info))) { 475 rc = -EINVAL; 476 goto out; 477 } 478 479 if (tx) { 480 crypto_info = &ctx->crypto_send.info; 481 alt_crypto_info = &ctx->crypto_recv.info; 482 } else { 483 crypto_info = &ctx->crypto_recv.info; 484 alt_crypto_info = &ctx->crypto_send.info; 485 } 486 487 /* Currently we don't support set crypto info more than one time */ 488 if (TLS_CRYPTO_INFO_READY(crypto_info)) { 489 rc = -EBUSY; 490 goto out; 491 } 492 493 rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info)); 494 if (rc) { 495 rc = -EFAULT; 496 goto err_crypto_info; 497 } 498 499 /* check version */ 500 if (crypto_info->version != TLS_1_2_VERSION && 501 crypto_info->version != TLS_1_3_VERSION) { 502 rc = -EINVAL; 503 goto err_crypto_info; 504 } 505 506 /* Ensure that TLS version and ciphers are same in both directions */ 507 if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) { 508 if (alt_crypto_info->version != crypto_info->version || 509 alt_crypto_info->cipher_type != crypto_info->cipher_type) { 510 rc = -EINVAL; 511 goto err_crypto_info; 512 } 513 } 514 515 switch (crypto_info->cipher_type) { 516 case TLS_CIPHER_AES_GCM_128: 517 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128); 518 break; 519 case TLS_CIPHER_AES_GCM_256: { 520 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256); 521 break; 522 } 523 case TLS_CIPHER_AES_CCM_128: 524 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128); 525 break; 526 case TLS_CIPHER_CHACHA20_POLY1305: 527 optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305); 528 break; 529 default: 530 rc = -EINVAL; 531 goto err_crypto_info; 532 } 533 534 if (optlen != optsize) { 535 rc = -EINVAL; 536 goto err_crypto_info; 537 } 538 539 rc = copy_from_sockptr_offset(crypto_info + 1, optval, 540 sizeof(*crypto_info), 541 optlen - sizeof(*crypto_info)); 542 if (rc) { 543 rc = -EFAULT; 544 goto err_crypto_info; 545 } 546 547 if (tx) { 548 rc = tls_set_device_offload(sk, ctx); 549 conf = TLS_HW; 550 if (!rc) { 551 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE); 552 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE); 553 } else { 554 rc = tls_set_sw_offload(sk, ctx, 1); 555 if (rc) 556 goto err_crypto_info; 557 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW); 558 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW); 559 conf = TLS_SW; 560 } 561 } else { 562 rc = tls_set_device_offload_rx(sk, ctx); 563 conf = TLS_HW; 564 if (!rc) { 565 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE); 566 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE); 567 } else { 568 rc = tls_set_sw_offload(sk, ctx, 0); 569 if (rc) 570 goto err_crypto_info; 571 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW); 572 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW); 573 conf = TLS_SW; 574 } 575 tls_sw_strparser_arm(sk, ctx); 576 } 577 578 if (tx) 579 ctx->tx_conf = conf; 580 else 581 ctx->rx_conf = conf; 582 update_sk_prot(sk, ctx); 583 if (tx) { 584 ctx->sk_write_space = sk->sk_write_space; 585 sk->sk_write_space = tls_write_space; 586 } 587 goto out; 588 589 err_crypto_info: 590 memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); 591 out: 592 return rc; 593 } 594 595 static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval, 596 unsigned int optlen) 597 { 598 int rc = 0; 599 600 switch (optname) { 601 case TLS_TX: 602 case TLS_RX: 603 lock_sock(sk); 604 rc = do_tls_setsockopt_conf(sk, optval, optlen, 605 optname == TLS_TX); 606 release_sock(sk); 607 break; 608 default: 609 rc = -ENOPROTOOPT; 610 break; 611 } 612 return rc; 613 } 614 615 static int tls_setsockopt(struct sock *sk, int level, int optname, 616 sockptr_t optval, unsigned int optlen) 617 { 618 struct tls_context *ctx = tls_get_ctx(sk); 619 620 if (level != SOL_TLS) 621 return ctx->sk_proto->setsockopt(sk, level, optname, optval, 622 optlen); 623 624 return do_tls_setsockopt(sk, optname, optval, optlen); 625 } 626 627 struct tls_context *tls_ctx_create(struct sock *sk) 628 { 629 struct inet_connection_sock *icsk = inet_csk(sk); 630 struct tls_context *ctx; 631 632 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); 633 if (!ctx) 634 return NULL; 635 636 mutex_init(&ctx->tx_lock); 637 rcu_assign_pointer(icsk->icsk_ulp_data, ctx); 638 ctx->sk_proto = READ_ONCE(sk->sk_prot); 639 ctx->sk = sk; 640 return ctx; 641 } 642 643 static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG], 644 const struct proto_ops *base) 645 { 646 ops[TLS_BASE][TLS_BASE] = *base; 647 648 ops[TLS_SW ][TLS_BASE] = ops[TLS_BASE][TLS_BASE]; 649 ops[TLS_SW ][TLS_BASE].sendpage_locked = tls_sw_sendpage_locked; 650 651 ops[TLS_BASE][TLS_SW ] = ops[TLS_BASE][TLS_BASE]; 652 ops[TLS_BASE][TLS_SW ].splice_read = tls_sw_splice_read; 653 654 ops[TLS_SW ][TLS_SW ] = ops[TLS_SW ][TLS_BASE]; 655 ops[TLS_SW ][TLS_SW ].splice_read = tls_sw_splice_read; 656 657 #ifdef CONFIG_TLS_DEVICE 658 ops[TLS_HW ][TLS_BASE] = ops[TLS_BASE][TLS_BASE]; 659 ops[TLS_HW ][TLS_BASE].sendpage_locked = NULL; 660 661 ops[TLS_HW ][TLS_SW ] = ops[TLS_BASE][TLS_SW ]; 662 ops[TLS_HW ][TLS_SW ].sendpage_locked = NULL; 663 664 ops[TLS_BASE][TLS_HW ] = ops[TLS_BASE][TLS_SW ]; 665 666 ops[TLS_SW ][TLS_HW ] = ops[TLS_SW ][TLS_SW ]; 667 668 ops[TLS_HW ][TLS_HW ] = ops[TLS_HW ][TLS_SW ]; 669 ops[TLS_HW ][TLS_HW ].sendpage_locked = NULL; 670 #endif 671 #ifdef CONFIG_TLS_TOE 672 ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base; 673 #endif 674 } 675 676 static void tls_build_proto(struct sock *sk) 677 { 678 int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4; 679 struct proto *prot = READ_ONCE(sk->sk_prot); 680 681 /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */ 682 if (ip_ver == TLSV6 && 683 unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) { 684 mutex_lock(&tcpv6_prot_mutex); 685 if (likely(prot != saved_tcpv6_prot)) { 686 build_protos(tls_prots[TLSV6], prot); 687 build_proto_ops(tls_proto_ops[TLSV6], 688 sk->sk_socket->ops); 689 smp_store_release(&saved_tcpv6_prot, prot); 690 } 691 mutex_unlock(&tcpv6_prot_mutex); 692 } 693 694 if (ip_ver == TLSV4 && 695 unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) { 696 mutex_lock(&tcpv4_prot_mutex); 697 if (likely(prot != saved_tcpv4_prot)) { 698 build_protos(tls_prots[TLSV4], prot); 699 build_proto_ops(tls_proto_ops[TLSV4], 700 sk->sk_socket->ops); 701 smp_store_release(&saved_tcpv4_prot, prot); 702 } 703 mutex_unlock(&tcpv4_prot_mutex); 704 } 705 } 706 707 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], 708 const struct proto *base) 709 { 710 prot[TLS_BASE][TLS_BASE] = *base; 711 prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; 712 prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; 713 prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; 714 715 prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; 716 prot[TLS_SW][TLS_BASE].sendmsg = tls_sw_sendmsg; 717 prot[TLS_SW][TLS_BASE].sendpage = tls_sw_sendpage; 718 719 prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE]; 720 prot[TLS_BASE][TLS_SW].recvmsg = tls_sw_recvmsg; 721 prot[TLS_BASE][TLS_SW].sock_is_readable = tls_sw_sock_is_readable; 722 prot[TLS_BASE][TLS_SW].close = tls_sk_proto_close; 723 724 prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE]; 725 prot[TLS_SW][TLS_SW].recvmsg = tls_sw_recvmsg; 726 prot[TLS_SW][TLS_SW].sock_is_readable = tls_sw_sock_is_readable; 727 prot[TLS_SW][TLS_SW].close = tls_sk_proto_close; 728 729 #ifdef CONFIG_TLS_DEVICE 730 prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; 731 prot[TLS_HW][TLS_BASE].sendmsg = tls_device_sendmsg; 732 prot[TLS_HW][TLS_BASE].sendpage = tls_device_sendpage; 733 734 prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW]; 735 prot[TLS_HW][TLS_SW].sendmsg = tls_device_sendmsg; 736 prot[TLS_HW][TLS_SW].sendpage = tls_device_sendpage; 737 738 prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW]; 739 740 prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW]; 741 742 prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW]; 743 #endif 744 #ifdef CONFIG_TLS_TOE 745 prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base; 746 prot[TLS_HW_RECORD][TLS_HW_RECORD].hash = tls_toe_hash; 747 prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash = tls_toe_unhash; 748 #endif 749 } 750 751 static int tls_init(struct sock *sk) 752 { 753 struct tls_context *ctx; 754 int rc = 0; 755 756 tls_build_proto(sk); 757 758 #ifdef CONFIG_TLS_TOE 759 if (tls_toe_bypass(sk)) 760 return 0; 761 #endif 762 763 /* The TLS ulp is currently supported only for TCP sockets 764 * in ESTABLISHED state. 765 * Supporting sockets in LISTEN state will require us 766 * to modify the accept implementation to clone rather then 767 * share the ulp context. 768 */ 769 if (sk->sk_state != TCP_ESTABLISHED) 770 return -ENOTCONN; 771 772 /* allocate tls context */ 773 write_lock_bh(&sk->sk_callback_lock); 774 ctx = tls_ctx_create(sk); 775 if (!ctx) { 776 rc = -ENOMEM; 777 goto out; 778 } 779 780 ctx->tx_conf = TLS_BASE; 781 ctx->rx_conf = TLS_BASE; 782 update_sk_prot(sk, ctx); 783 out: 784 write_unlock_bh(&sk->sk_callback_lock); 785 return rc; 786 } 787 788 static void tls_update(struct sock *sk, struct proto *p, 789 void (*write_space)(struct sock *sk)) 790 { 791 struct tls_context *ctx; 792 793 WARN_ON_ONCE(sk->sk_prot == p); 794 795 ctx = tls_get_ctx(sk); 796 if (likely(ctx)) { 797 ctx->sk_write_space = write_space; 798 ctx->sk_proto = p; 799 } else { 800 /* Pairs with lockless read in sk_clone_lock(). */ 801 WRITE_ONCE(sk->sk_prot, p); 802 sk->sk_write_space = write_space; 803 } 804 } 805 806 static int tls_get_info(const struct sock *sk, struct sk_buff *skb) 807 { 808 u16 version, cipher_type; 809 struct tls_context *ctx; 810 struct nlattr *start; 811 int err; 812 813 start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS); 814 if (!start) 815 return -EMSGSIZE; 816 817 rcu_read_lock(); 818 ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data); 819 if (!ctx) { 820 err = 0; 821 goto nla_failure; 822 } 823 version = ctx->prot_info.version; 824 if (version) { 825 err = nla_put_u16(skb, TLS_INFO_VERSION, version); 826 if (err) 827 goto nla_failure; 828 } 829 cipher_type = ctx->prot_info.cipher_type; 830 if (cipher_type) { 831 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type); 832 if (err) 833 goto nla_failure; 834 } 835 err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true)); 836 if (err) 837 goto nla_failure; 838 839 err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false)); 840 if (err) 841 goto nla_failure; 842 843 rcu_read_unlock(); 844 nla_nest_end(skb, start); 845 return 0; 846 847 nla_failure: 848 rcu_read_unlock(); 849 nla_nest_cancel(skb, start); 850 return err; 851 } 852 853 static size_t tls_get_info_size(const struct sock *sk) 854 { 855 size_t size = 0; 856 857 size += nla_total_size(0) + /* INET_ULP_INFO_TLS */ 858 nla_total_size(sizeof(u16)) + /* TLS_INFO_VERSION */ 859 nla_total_size(sizeof(u16)) + /* TLS_INFO_CIPHER */ 860 nla_total_size(sizeof(u16)) + /* TLS_INFO_RXCONF */ 861 nla_total_size(sizeof(u16)) + /* TLS_INFO_TXCONF */ 862 0; 863 864 return size; 865 } 866 867 static int __net_init tls_init_net(struct net *net) 868 { 869 int err; 870 871 net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib); 872 if (!net->mib.tls_statistics) 873 return -ENOMEM; 874 875 err = tls_proc_init(net); 876 if (err) 877 goto err_free_stats; 878 879 return 0; 880 err_free_stats: 881 free_percpu(net->mib.tls_statistics); 882 return err; 883 } 884 885 static void __net_exit tls_exit_net(struct net *net) 886 { 887 tls_proc_fini(net); 888 free_percpu(net->mib.tls_statistics); 889 } 890 891 static struct pernet_operations tls_proc_ops = { 892 .init = tls_init_net, 893 .exit = tls_exit_net, 894 }; 895 896 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = { 897 .name = "tls", 898 .owner = THIS_MODULE, 899 .init = tls_init, 900 .update = tls_update, 901 .get_info = tls_get_info, 902 .get_info_size = tls_get_info_size, 903 }; 904 905 static int __init tls_register(void) 906 { 907 int err; 908 909 err = register_pernet_subsys(&tls_proc_ops); 910 if (err) 911 return err; 912 913 tls_device_init(); 914 tcp_register_ulp(&tcp_tls_ulp_ops); 915 916 return 0; 917 } 918 919 static void __exit tls_unregister(void) 920 { 921 tcp_unregister_ulp(&tcp_tls_ulp_ops); 922 tls_device_cleanup(); 923 unregister_pernet_subsys(&tls_proc_ops); 924 } 925 926 module_init(tls_register); 927 module_exit(tls_unregister); 928