net/tls/tls_main.c

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