net/tls/tls_main.c

   1 /*
   2  * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2016-2017, Dave Watson <[email protected]>. 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
  55 static struct proto *saved_tcpv6_prot;
  56 static DEFINE_MUTEX(tcpv6_prot_mutex);
  57 static LIST_HEAD(device_list);
  58 static DEFINE_MUTEX(device_mutex);
  59 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  60 static struct proto_ops tls_sw_proto_ops;
  61
  62 static void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  63 {
  64         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  65
  66         sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf];
  67 }
  68
  69 int wait_on_pending_writer(struct sock *sk, long *timeo)
  70 {
  71         int rc = 0;
  72         DEFINE_WAIT_FUNC(wait, woken_wake_function);
  73
  74         add_wait_queue(sk_sleep(sk), &wait);
  75         while (1) {
  76                 if (!*timeo) {
  77                         rc = -EAGAIN;
  78                         break;
  79                 }
  80
  81                 if (signal_pending(current)) {
  82                         rc = sock_intr_errno(*timeo);
  83                         break;
  84                 }
  85
  86                 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
  87                         break;
  88         }
  89         remove_wait_queue(sk_sleep(sk), &wait);
  90         return rc;
  91 }
  92
  93 int tls_push_sg(struct sock *sk,
  94                 struct tls_context *ctx,
  95                 struct scatterlist *sg,
  96                 u16 first_offset,
  97                 int flags)
  98 {
  99         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 100         int ret = 0;
 101         struct page *p;
 102         size_t size;
 103         int offset = first_offset;
 104
 105         size = sg->length - offset;
 106         offset += sg->offset;
 107
 108         ctx->in_tcp_sendpages = true;
 109         while (1) {
 110                 if (sg_is_last(sg))
 111                         sendpage_flags = flags;
 112
 113                 /* is sending application-limited? */
 114                 tcp_rate_check_app_limited(sk);
 115                 p = sg_page(sg);
 116 retry:
 117                 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
 118
 119                 if (ret != size) {
 120                         if (ret > 0) {
 121                                 offset += ret;
 122                                 size -= ret;
 123                                 goto retry;
 124                         }
 125
 126                         offset -= sg->offset;
 127                         ctx->partially_sent_offset = offset;
 128                         ctx->partially_sent_record = (void *)sg;
 129                         ctx->in_tcp_sendpages = false;
 130                         return ret;
 131                 }
 132
 133                 put_page(p);
 134                 sk_mem_uncharge(sk, sg->length);
 135                 sg = sg_next(sg);
 136                 if (!sg)
 137                         break;
 138
 139                 offset = sg->offset;
 140                 size = sg->length;
 141         }
 142
 143         clear_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
 144         ctx->in_tcp_sendpages = false;
 145         ctx->sk_write_space(sk);
 146
 147         return 0;
 148 }
 149
 150 static int tls_handle_open_record(struct sock *sk, int flags)
 151 {
 152         struct tls_context *ctx = tls_get_ctx(sk);
 153
 154         if (tls_is_pending_open_record(ctx))
 155                 return ctx->push_pending_record(sk, flags);
 156
 157         return 0;
 158 }
 159
 160 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 161                       unsigned char *record_type)
 162 {
 163         struct cmsghdr *cmsg;
 164         int rc = -EINVAL;
 165
 166         for_each_cmsghdr(cmsg, msg) {
 167                 if (!CMSG_OK(msg, cmsg))
 168                         return -EINVAL;
 169                 if (cmsg->cmsg_level != SOL_TLS)
 170                         continue;
 171
 172                 switch (cmsg->cmsg_type) {
 173                 case TLS_SET_RECORD_TYPE:
 174                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 175                                 return -EINVAL;
 176
 177                         if (msg->msg_flags & MSG_MORE)
 178                                 return -EINVAL;
 179
 180                         rc = tls_handle_open_record(sk, msg->msg_flags);
 181                         if (rc)
 182                                 return rc;
 183
 184                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 185                         rc = 0;
 186                         break;
 187                 default:
 188                         return -EINVAL;
 189                 }
 190         }
 191
 192         return rc;
 193 }
 194
 195 int tls_push_pending_closed_record(struct sock *sk, struct tls_context *ctx,
 196                                    int flags, long *timeo)
 197 {
 198         struct scatterlist *sg;
 199         u16 offset;
 200
 201         if (!tls_is_partially_sent_record(ctx))
 202                 return ctx->push_pending_record(sk, flags);
 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 static void tls_write_space(struct sock *sk)
 212 {
 213         struct tls_context *ctx = tls_get_ctx(sk);
 214
 215         /* We are already sending pages, ignore notification */
 216         if (ctx->in_tcp_sendpages)
 217                 return;
 218
 219         if (!sk->sk_write_pending && tls_is_pending_closed_record(ctx)) {
 220                 gfp_t sk_allocation = sk->sk_allocation;
 221                 int rc;
 222                 long timeo = 0;
 223
 224                 sk->sk_allocation = GFP_ATOMIC;
 225                 rc = tls_push_pending_closed_record(sk, ctx,
 226                                                     MSG_DONTWAIT |
 227                                                     MSG_NOSIGNAL,
 228                                                     &timeo);
 229                 sk->sk_allocation = sk_allocation;
 230
 231                 if (rc < 0)
 232                         return;
 233         }
 234
 235         ctx->sk_write_space(sk);
 236 }
 237
 238 static void tls_sk_proto_close(struct sock *sk, long timeout)
 239 {
 240         struct tls_context *ctx = tls_get_ctx(sk);
 241         long timeo = sock_sndtimeo(sk, 0);
 242         void (*sk_proto_close)(struct sock *sk, long timeout);
 243         bool free_ctx = false;
 244
 245         lock_sock(sk);
 246         sk_proto_close = ctx->sk_proto_close;
 247
 248         if ((ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD) ||
 249             (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE)) {
 250                 free_ctx = true;
 251                 goto skip_tx_cleanup;
 252         }
 253
 254         if (!tls_complete_pending_work(sk, ctx, 0, &timeo))
 255                 tls_handle_open_record(sk, 0);
 256
 257         if (ctx->partially_sent_record) {
 258                 struct scatterlist *sg = ctx->partially_sent_record;
 259
 260                 while (1) {
 261                         put_page(sg_page(sg));
 262                         sk_mem_uncharge(sk, sg->length);
 263
 264                         if (sg_is_last(sg))
 265                                 break;
 266                         sg++;
 267                 }
 268         }
 269
 270         /* We need these for tls_sw_fallback handling of other packets */
 271         if (ctx->tx_conf == TLS_SW) {
 272                 kfree(ctx->tx.rec_seq);
 273                 kfree(ctx->tx.iv);
 274                 tls_sw_free_resources_tx(sk);
 275         }
 276
 277         if (ctx->rx_conf == TLS_SW) {
 278                 kfree(ctx->rx.rec_seq);
 279                 kfree(ctx->rx.iv);
 280                 tls_sw_free_resources_rx(sk);
 281         }
 282
 283 #ifdef CONFIG_TLS_DEVICE
 284         if (ctx->rx_conf == TLS_HW)
 285                 tls_device_offload_cleanup_rx(sk);
 286
 287         if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) {
 288 #else
 289         {
 290 #endif
 291                 kfree(ctx);
 292                 ctx = NULL;
 293         }
 294
 295 skip_tx_cleanup:
 296         release_sock(sk);
 297         sk_proto_close(sk, timeout);
 298         /* free ctx for TLS_HW_RECORD, used by tcp_set_state
 299          * for sk->sk_prot->unhash [tls_hw_unhash]
 300          */
 301         if (free_ctx)
 302                 kfree(ctx);
 303 }
 304
 305 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 306                                 int __user *optlen)
 307 {
 308         int rc = 0;
 309         struct tls_context *ctx = tls_get_ctx(sk);
 310         struct tls_crypto_info *crypto_info;
 311         int len;
 312
 313         if (get_user(len, optlen))
 314                 return -EFAULT;
 315
 316         if (!optval || (len < sizeof(*crypto_info))) {
 317                 rc = -EINVAL;
 318                 goto out;
 319         }
 320
 321         if (!ctx) {
 322                 rc = -EBUSY;
 323                 goto out;
 324         }
 325
 326         /* get user crypto info */
 327         crypto_info = &ctx->crypto_send;
 328
 329         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 330                 rc = -EBUSY;
 331                 goto out;
 332         }
 333
 334         if (len == sizeof(*crypto_info)) {
 335                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 336                         rc = -EFAULT;
 337                 goto out;
 338         }
 339
 340         switch (crypto_info->cipher_type) {
 341         case TLS_CIPHER_AES_GCM_128: {
 342                 struct tls12_crypto_info_aes_gcm_128 *
 343                   crypto_info_aes_gcm_128 =
 344                   container_of(crypto_info,
 345                                struct tls12_crypto_info_aes_gcm_128,
 346                                info);
 347
 348                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 349                         rc = -EINVAL;
 350                         goto out;
 351                 }
 352                 lock_sock(sk);
 353                 memcpy(crypto_info_aes_gcm_128->iv,
 354                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 355                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 356                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 357                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 358                 release_sock(sk);
 359                 if (copy_to_user(optval,
 360                                  crypto_info_aes_gcm_128,
 361                                  sizeof(*crypto_info_aes_gcm_128)))
 362                         rc = -EFAULT;
 363                 break;
 364         }
 365         default:
 366                 rc = -EINVAL;
 367         }
 368
 369 out:
 370         return rc;
 371 }
 372
 373 static int do_tls_getsockopt(struct sock *sk, int optname,
 374                              char __user *optval, int __user *optlen)
 375 {
 376         int rc = 0;
 377
 378         switch (optname) {
 379         case TLS_TX:
 380                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 381                 break;
 382         default:
 383                 rc = -ENOPROTOOPT;
 384                 break;
 385         }
 386         return rc;
 387 }
 388
 389 static int tls_getsockopt(struct sock *sk, int level, int optname,
 390                           char __user *optval, int __user *optlen)
 391 {
 392         struct tls_context *ctx = tls_get_ctx(sk);
 393
 394         if (level != SOL_TLS)
 395                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 396
 397         return do_tls_getsockopt(sk, optname, optval, optlen);
 398 }
 399
 400 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 401                                   unsigned int optlen, int tx)
 402 {
 403         struct tls_crypto_info *crypto_info;
 404         struct tls_context *ctx = tls_get_ctx(sk);
 405         int rc = 0;
 406         int conf;
 407
 408         if (!optval || (optlen < sizeof(*crypto_info))) {
 409                 rc = -EINVAL;
 410                 goto out;
 411         }
 412
 413         if (tx)
 414                 crypto_info = &ctx->crypto_send;
 415         else
 416                 crypto_info = &ctx->crypto_recv;
 417
 418         /* Currently we don't support set crypto info more than one time */
 419         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 420                 rc = -EBUSY;
 421                 goto out;
 422         }
 423
 424         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 425         if (rc) {
 426                 rc = -EFAULT;
 427                 goto err_crypto_info;
 428         }
 429
 430         /* check version */
 431         if (crypto_info->version != TLS_1_2_VERSION) {
 432                 rc = -ENOTSUPP;
 433                 goto err_crypto_info;
 434         }
 435
 436         switch (crypto_info->cipher_type) {
 437         case TLS_CIPHER_AES_GCM_128: {
 438                 if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) {
 439                         rc = -EINVAL;
 440                         goto err_crypto_info;
 441                 }
 442                 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 443                                     optlen - sizeof(*crypto_info));
 444                 if (rc) {
 445                         rc = -EFAULT;
 446                         goto err_crypto_info;
 447                 }
 448                 break;
 449         }
 450         default:
 451                 rc = -EINVAL;
 452                 goto err_crypto_info;
 453         }
 454
 455         if (tx) {
 456 #ifdef CONFIG_TLS_DEVICE
 457                 rc = tls_set_device_offload(sk, ctx);
 458                 conf = TLS_HW;
 459                 if (rc) {
 460 #else
 461                 {
 462 #endif
 463                         rc = tls_set_sw_offload(sk, ctx, 1);
 464                         conf = TLS_SW;
 465                 }
 466         } else {
 467 #ifdef CONFIG_TLS_DEVICE
 468                 rc = tls_set_device_offload_rx(sk, ctx);
 469                 conf = TLS_HW;
 470                 if (rc) {
 471 #else
 472                 {
 473 #endif
 474                         rc = tls_set_sw_offload(sk, ctx, 0);
 475                         conf = TLS_SW;
 476                 }
 477         }
 478
 479         if (rc)
 480                 goto err_crypto_info;
 481
 482         if (tx)
 483                 ctx->tx_conf = conf;
 484         else
 485                 ctx->rx_conf = conf;
 486         update_sk_prot(sk, ctx);
 487         if (tx) {
 488                 ctx->sk_write_space = sk->sk_write_space;
 489                 sk->sk_write_space = tls_write_space;
 490         } else {
 491                 sk->sk_socket->ops = &tls_sw_proto_ops;
 492         }
 493         goto out;
 494
 495 err_crypto_info:
 496         memset(crypto_info, 0, sizeof(*crypto_info));
 497 out:
 498         return rc;
 499 }
 500
 501 static int do_tls_setsockopt(struct sock *sk, int optname,
 502                              char __user *optval, unsigned int optlen)
 503 {
 504         int rc = 0;
 505
 506         switch (optname) {
 507         case TLS_TX:
 508         case TLS_RX:
 509                 lock_sock(sk);
 510                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 511                                             optname == TLS_TX);
 512                 release_sock(sk);
 513                 break;
 514         default:
 515                 rc = -ENOPROTOOPT;
 516                 break;
 517         }
 518         return rc;
 519 }
 520
 521 static int tls_setsockopt(struct sock *sk, int level, int optname,
 522                           char __user *optval, unsigned int optlen)
 523 {
 524         struct tls_context *ctx = tls_get_ctx(sk);
 525
 526         if (level != SOL_TLS)
 527                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 528
 529         return do_tls_setsockopt(sk, optname, optval, optlen);
 530 }
 531
 532 static struct tls_context *create_ctx(struct sock *sk)
 533 {
 534         struct inet_connection_sock *icsk = inet_csk(sk);
 535         struct tls_context *ctx;
 536
 537         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 538         if (!ctx)
 539                 return NULL;
 540
 541         icsk->icsk_ulp_data = ctx;
 542         return ctx;
 543 }
 544
 545 static int tls_hw_prot(struct sock *sk)
 546 {
 547         struct tls_context *ctx;
 548         struct tls_device *dev;
 549         int rc = 0;
 550
 551         mutex_lock(&device_mutex);
 552         list_for_each_entry(dev, &device_list, dev_list) {
 553                 if (dev->feature && dev->feature(dev)) {
 554                         ctx = create_ctx(sk);
 555                         if (!ctx)
 556                                 goto out;
 557
 558                         ctx->hash = sk->sk_prot->hash;
 559                         ctx->unhash = sk->sk_prot->unhash;
 560                         ctx->sk_proto_close = sk->sk_prot->close;
 561                         ctx->rx_conf = TLS_HW_RECORD;
 562                         ctx->tx_conf = TLS_HW_RECORD;
 563                         update_sk_prot(sk, ctx);
 564                         rc = 1;
 565                         break;
 566                 }
 567         }
 568 out:
 569         mutex_unlock(&device_mutex);
 570         return rc;
 571 }
 572
 573 static void tls_hw_unhash(struct sock *sk)
 574 {
 575         struct tls_context *ctx = tls_get_ctx(sk);
 576         struct tls_device *dev;
 577
 578         mutex_lock(&device_mutex);
 579         list_for_each_entry(dev, &device_list, dev_list) {
 580                 if (dev->unhash)
 581                         dev->unhash(dev, sk);
 582         }
 583         mutex_unlock(&device_mutex);
 584         ctx->unhash(sk);
 585 }
 586
 587 static int tls_hw_hash(struct sock *sk)
 588 {
 589         struct tls_context *ctx = tls_get_ctx(sk);
 590         struct tls_device *dev;
 591         int err;
 592
 593         err = ctx->hash(sk);
 594         mutex_lock(&device_mutex);
 595         list_for_each_entry(dev, &device_list, dev_list) {
 596                 if (dev->hash)
 597                         err |= dev->hash(dev, sk);
 598         }
 599         mutex_unlock(&device_mutex);
 600
 601         if (err)
 602                 tls_hw_unhash(sk);
 603         return err;
 604 }
 605
 606 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 607                          struct proto *base)
 608 {
 609         prot[TLS_BASE][TLS_BASE] = *base;
 610         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 611         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 612         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 613
 614         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 615         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 616         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 617
 618         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 619         prot[TLS_BASE][TLS_SW].recvmsg          = tls_sw_recvmsg;
 620         prot[TLS_BASE][TLS_SW].close            = tls_sk_proto_close;
 621
 622         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 623         prot[TLS_SW][TLS_SW].recvmsg    = tls_sw_recvmsg;
 624         prot[TLS_SW][TLS_SW].close      = tls_sk_proto_close;
 625
 626 #ifdef CONFIG_TLS_DEVICE
 627         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 628         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 629         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 630
 631         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 632         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 633         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 634
 635         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 636
 637         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 638
 639         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 640 #endif
 641
 642         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 643         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 644         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 645         prot[TLS_HW_RECORD][TLS_HW_RECORD].close        = tls_sk_proto_close;
 646 }
 647
 648 static int tls_init(struct sock *sk)
 649 {
 650         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 651         struct tls_context *ctx;
 652         int rc = 0;
 653
 654         if (tls_hw_prot(sk))
 655                 goto out;
 656
 657         /* The TLS ulp is currently supported only for TCP sockets
 658          * in ESTABLISHED state.
 659          * Supporting sockets in LISTEN state will require us
 660          * to modify the accept implementation to clone rather then
 661          * share the ulp context.
 662          */
 663         if (sk->sk_state != TCP_ESTABLISHED)
 664                 return -ENOTSUPP;
 665
 666         /* allocate tls context */
 667         ctx = create_ctx(sk);
 668         if (!ctx) {
 669                 rc = -ENOMEM;
 670                 goto out;
 671         }
 672         ctx->setsockopt = sk->sk_prot->setsockopt;
 673         ctx->getsockopt = sk->sk_prot->getsockopt;
 674         ctx->sk_proto_close = sk->sk_prot->close;
 675
 676         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 677         if (ip_ver == TLSV6 &&
 678             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 679                 mutex_lock(&tcpv6_prot_mutex);
 680                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 681                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 682                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 683                 }
 684                 mutex_unlock(&tcpv6_prot_mutex);
 685         }
 686
 687         ctx->tx_conf = TLS_BASE;
 688         ctx->rx_conf = TLS_BASE;
 689         update_sk_prot(sk, ctx);
 690 out:
 691         return rc;
 692 }
 693
 694 void tls_register_device(struct tls_device *device)
 695 {
 696         mutex_lock(&device_mutex);
 697         list_add_tail(&device->dev_list, &device_list);
 698         mutex_unlock(&device_mutex);
 699 }
 700 EXPORT_SYMBOL(tls_register_device);
 701
 702 void tls_unregister_device(struct tls_device *device)
 703 {
 704         mutex_lock(&device_mutex);
 705         list_del(&device->dev_list);
 706         mutex_unlock(&device_mutex);
 707 }
 708 EXPORT_SYMBOL(tls_unregister_device);
 709
 710 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 711         .name                   = "tls",
 712         .uid                    = TCP_ULP_TLS,
 713         .user_visible           = true,
 714         .owner                  = THIS_MODULE,
 715         .init                   = tls_init,
 716 };
 717
 718 static int __init tls_register(void)
 719 {
 720         build_protos(tls_prots[TLSV4], &tcp_prot);
 721
 722         tls_sw_proto_ops = inet_stream_ops;
 723         tls_sw_proto_ops.poll = tls_sw_poll;
 724         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 725
 726 #ifdef CONFIG_TLS_DEVICE
 727         tls_device_init();
 728 #endif
 729         tcp_register_ulp(&tcp_tls_ulp_ops);
 730
 731         return 0;
 732 }
 733
 734 static void __exit tls_unregister(void)
 735 {
 736         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 737 #ifdef CONFIG_TLS_DEVICE
 738         tls_device_cleanup();
 739 #endif
 740 }
 741
 742 module_init(tls_register);
 743 module_exit(tls_unregister);