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         TLS_HW_RECORD,
  58         TLS_NUM_CONFIG,
  59 };
  60
  61 static struct proto *saved_tcpv6_prot;
  62 static DEFINE_MUTEX(tcpv6_prot_mutex);
  63 static LIST_HEAD(device_list);
  64 static DEFINE_MUTEX(device_mutex);
  65 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  66 static struct proto_ops tls_sw_proto_ops;
  67
  68 static void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  69 {
  70         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  71
  72         sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf];
  73 }
  74
  75 int wait_on_pending_writer(struct sock *sk, long *timeo)
  76 {
  77         int rc = 0;
  78         DEFINE_WAIT_FUNC(wait, woken_wake_function);
  79
  80         add_wait_queue(sk_sleep(sk), &wait);
  81         while (1) {
  82                 if (!*timeo) {
  83                         rc = -EAGAIN;
  84                         break;
  85                 }
  86
  87                 if (signal_pending(current)) {
  88                         rc = sock_intr_errno(*timeo);
  89                         break;
  90                 }
  91
  92                 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
  93                         break;
  94         }
  95         remove_wait_queue(sk_sleep(sk), &wait);
  96         return rc;
  97 }
  98
  99 int tls_push_sg(struct sock *sk,
 100                 struct tls_context *ctx,
 101                 struct scatterlist *sg,
 102                 u16 first_offset,
 103                 int flags)
 104 {
 105         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 106         int ret = 0;
 107         struct page *p;
 108         size_t size;
 109         int offset = first_offset;
 110
 111         size = sg->length - offset;
 112         offset += sg->offset;
 113
 114         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                         return ret;
 135                 }
 136
 137                 put_page(p);
 138                 sk_mem_uncharge(sk, sg->length);
 139                 sg = sg_next(sg);
 140                 if (!sg)
 141                         break;
 142
 143                 offset = sg->offset;
 144                 size = sg->length;
 145         }
 146
 147         clear_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
 148
 149         return 0;
 150 }
 151
 152 static int tls_handle_open_record(struct sock *sk, int flags)
 153 {
 154         struct tls_context *ctx = tls_get_ctx(sk);
 155
 156         if (tls_is_pending_open_record(ctx))
 157                 return ctx->push_pending_record(sk, flags);
 158
 159         return 0;
 160 }
 161
 162 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 163                       unsigned char *record_type)
 164 {
 165         struct cmsghdr *cmsg;
 166         int rc = -EINVAL;
 167
 168         for_each_cmsghdr(cmsg, msg) {
 169                 if (!CMSG_OK(msg, cmsg))
 170                         return -EINVAL;
 171                 if (cmsg->cmsg_level != SOL_TLS)
 172                         continue;
 173
 174                 switch (cmsg->cmsg_type) {
 175                 case TLS_SET_RECORD_TYPE:
 176                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 177                                 return -EINVAL;
 178
 179                         if (msg->msg_flags & MSG_MORE)
 180                                 return -EINVAL;
 181
 182                         rc = tls_handle_open_record(sk, msg->msg_flags);
 183                         if (rc)
 184                                 return rc;
 185
 186                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 187                         rc = 0;
 188                         break;
 189                 default:
 190                         return -EINVAL;
 191                 }
 192         }
 193
 194         return rc;
 195 }
 196
 197 int tls_push_pending_closed_record(struct sock *sk, struct tls_context *ctx,
 198                                    int flags, long *timeo)
 199 {
 200         struct scatterlist *sg;
 201         u16 offset;
 202
 203         if (!tls_is_partially_sent_record(ctx))
 204                 return ctx->push_pending_record(sk, flags);
 205
 206         sg = ctx->partially_sent_record;
 207         offset = ctx->partially_sent_offset;
 208
 209         ctx->partially_sent_record = NULL;
 210         return tls_push_sg(sk, ctx, sg, offset, flags);
 211 }
 212
 213 static void tls_write_space(struct sock *sk)
 214 {
 215         struct tls_context *ctx = tls_get_ctx(sk);
 216
 217         if (!sk->sk_write_pending && tls_is_pending_closed_record(ctx)) {
 218                 gfp_t sk_allocation = sk->sk_allocation;
 219                 int rc;
 220                 long timeo = 0;
 221
 222                 sk->sk_allocation = GFP_ATOMIC;
 223                 rc = tls_push_pending_closed_record(sk, ctx,
 224                                                     MSG_DONTWAIT |
 225                                                     MSG_NOSIGNAL,
 226                                                     &timeo);
 227                 sk->sk_allocation = sk_allocation;
 228
 229                 if (rc < 0)
 230                         return;
 231         }
 232
 233         ctx->sk_write_space(sk);
 234 }
 235
 236 static void tls_sk_proto_close(struct sock *sk, long timeout)
 237 {
 238         struct tls_context *ctx = tls_get_ctx(sk);
 239         long timeo = sock_sndtimeo(sk, 0);
 240         void (*sk_proto_close)(struct sock *sk, long timeout);
 241
 242         lock_sock(sk);
 243         sk_proto_close = ctx->sk_proto_close;
 244
 245         if (ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD)
 246                 goto skip_tx_cleanup;
 247
 248         if (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE) {
 249                 kfree(ctx);
 250                 ctx = NULL;
 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 skip_tx_cleanup:
 284         release_sock(sk);
 285         sk_proto_close(sk, timeout);
 286         /* free ctx for TLS_HW_RECORD, used by tcp_set_state
 287          * for sk->sk_prot->unhash [tls_hw_unhash]
 288          */
 289         if (ctx && ctx->tx_conf == TLS_HW_RECORD &&
 290             ctx->rx_conf == TLS_HW_RECORD)
 291                 kfree(ctx);
 292 }
 293
 294 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 295                                 int __user *optlen)
 296 {
 297         int rc = 0;
 298         struct tls_context *ctx = tls_get_ctx(sk);
 299         struct tls_crypto_info *crypto_info;
 300         int len;
 301
 302         if (get_user(len, optlen))
 303                 return -EFAULT;
 304
 305         if (!optval || (len < sizeof(*crypto_info))) {
 306                 rc = -EINVAL;
 307                 goto out;
 308         }
 309
 310         if (!ctx) {
 311                 rc = -EBUSY;
 312                 goto out;
 313         }
 314
 315         /* get user crypto info */
 316         crypto_info = &ctx->crypto_send;
 317
 318         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 319                 rc = -EBUSY;
 320                 goto out;
 321         }
 322
 323         if (len == sizeof(*crypto_info)) {
 324                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 325                         rc = -EFAULT;
 326                 goto out;
 327         }
 328
 329         switch (crypto_info->cipher_type) {
 330         case TLS_CIPHER_AES_GCM_128: {
 331                 struct tls12_crypto_info_aes_gcm_128 *
 332                   crypto_info_aes_gcm_128 =
 333                   container_of(crypto_info,
 334                                struct tls12_crypto_info_aes_gcm_128,
 335                                info);
 336
 337                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 338                         rc = -EINVAL;
 339                         goto out;
 340                 }
 341                 lock_sock(sk);
 342                 memcpy(crypto_info_aes_gcm_128->iv,
 343                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 344                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 345                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 346                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 347                 release_sock(sk);
 348                 if (copy_to_user(optval,
 349                                  crypto_info_aes_gcm_128,
 350                                  sizeof(*crypto_info_aes_gcm_128)))
 351                         rc = -EFAULT;
 352                 break;
 353         }
 354         default:
 355                 rc = -EINVAL;
 356         }
 357
 358 out:
 359         return rc;
 360 }
 361
 362 static int do_tls_getsockopt(struct sock *sk, int optname,
 363                              char __user *optval, int __user *optlen)
 364 {
 365         int rc = 0;
 366
 367         switch (optname) {
 368         case TLS_TX:
 369                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 370                 break;
 371         default:
 372                 rc = -ENOPROTOOPT;
 373                 break;
 374         }
 375         return rc;
 376 }
 377
 378 static int tls_getsockopt(struct sock *sk, int level, int optname,
 379                           char __user *optval, int __user *optlen)
 380 {
 381         struct tls_context *ctx = tls_get_ctx(sk);
 382
 383         if (level != SOL_TLS)
 384                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 385
 386         return do_tls_getsockopt(sk, optname, optval, optlen);
 387 }
 388
 389 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 390                                   unsigned int optlen, int tx)
 391 {
 392         struct tls_crypto_info *crypto_info;
 393         struct tls_context *ctx = tls_get_ctx(sk);
 394         int rc = 0;
 395         int conf;
 396
 397         if (!optval || (optlen < sizeof(*crypto_info))) {
 398                 rc = -EINVAL;
 399                 goto out;
 400         }
 401
 402         if (tx)
 403                 crypto_info = &ctx->crypto_send;
 404         else
 405                 crypto_info = &ctx->crypto_recv;
 406
 407         /* Currently we don't support set crypto info more than one time */
 408         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 409                 rc = -EBUSY;
 410                 goto out;
 411         }
 412
 413         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 414         if (rc) {
 415                 rc = -EFAULT;
 416                 goto err_crypto_info;
 417         }
 418
 419         /* check version */
 420         if (crypto_info->version != TLS_1_2_VERSION) {
 421                 rc = -ENOTSUPP;
 422                 goto err_crypto_info;
 423         }
 424
 425         switch (crypto_info->cipher_type) {
 426         case TLS_CIPHER_AES_GCM_128: {
 427                 if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) {
 428                         rc = -EINVAL;
 429                         goto err_crypto_info;
 430                 }
 431                 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 432                                     optlen - sizeof(*crypto_info));
 433                 if (rc) {
 434                         rc = -EFAULT;
 435                         goto err_crypto_info;
 436                 }
 437                 break;
 438         }
 439         default:
 440                 rc = -EINVAL;
 441                 goto err_crypto_info;
 442         }
 443
 444         if (tx) {
 445                 rc = tls_set_sw_offload(sk, ctx, 1);
 446                 conf = TLS_SW;
 447         } else {
 448                 rc = tls_set_sw_offload(sk, ctx, 0);
 449                 conf = TLS_SW;
 450         }
 451
 452         if (rc)
 453                 goto err_crypto_info;
 454
 455         if (tx)
 456                 ctx->tx_conf = conf;
 457         else
 458                 ctx->rx_conf = conf;
 459         update_sk_prot(sk, ctx);
 460         if (tx) {
 461                 ctx->sk_write_space = sk->sk_write_space;
 462                 sk->sk_write_space = tls_write_space;
 463         } else {
 464                 sk->sk_socket->ops = &tls_sw_proto_ops;
 465         }
 466         goto out;
 467
 468 err_crypto_info:
 469         memset(crypto_info, 0, sizeof(*crypto_info));
 470 out:
 471         return rc;
 472 }
 473
 474 static int do_tls_setsockopt(struct sock *sk, int optname,
 475                              char __user *optval, unsigned int optlen)
 476 {
 477         int rc = 0;
 478
 479         switch (optname) {
 480         case TLS_TX:
 481         case TLS_RX:
 482                 lock_sock(sk);
 483                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 484                                             optname == TLS_TX);
 485                 release_sock(sk);
 486                 break;
 487         default:
 488                 rc = -ENOPROTOOPT;
 489                 break;
 490         }
 491         return rc;
 492 }
 493
 494 static int tls_setsockopt(struct sock *sk, int level, int optname,
 495                           char __user *optval, unsigned int optlen)
 496 {
 497         struct tls_context *ctx = tls_get_ctx(sk);
 498
 499         if (level != SOL_TLS)
 500                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 501
 502         return do_tls_setsockopt(sk, optname, optval, optlen);
 503 }
 504
 505 static struct tls_context *create_ctx(struct sock *sk)
 506 {
 507         struct inet_connection_sock *icsk = inet_csk(sk);
 508         struct tls_context *ctx;
 509
 510         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 511         if (!ctx)
 512                 return NULL;
 513
 514         icsk->icsk_ulp_data = ctx;
 515         return ctx;
 516 }
 517
 518 static int tls_hw_prot(struct sock *sk)
 519 {
 520         struct tls_context *ctx;
 521         struct tls_device *dev;
 522         int rc = 0;
 523
 524         mutex_lock(&device_mutex);
 525         list_for_each_entry(dev, &device_list, dev_list) {
 526                 if (dev->feature && dev->feature(dev)) {
 527                         ctx = create_ctx(sk);
 528                         if (!ctx)
 529                                 goto out;
 530
 531                         ctx->hash = sk->sk_prot->hash;
 532                         ctx->unhash = sk->sk_prot->unhash;
 533                         ctx->sk_proto_close = sk->sk_prot->close;
 534                         ctx->rx_conf = TLS_HW_RECORD;
 535                         ctx->tx_conf = TLS_HW_RECORD;
 536                         update_sk_prot(sk, ctx);
 537                         rc = 1;
 538                         break;
 539                 }
 540         }
 541 out:
 542         mutex_unlock(&device_mutex);
 543         return rc;
 544 }
 545
 546 static void tls_hw_unhash(struct sock *sk)
 547 {
 548         struct tls_context *ctx = tls_get_ctx(sk);
 549         struct tls_device *dev;
 550
 551         mutex_lock(&device_mutex);
 552         list_for_each_entry(dev, &device_list, dev_list) {
 553                 if (dev->unhash)
 554                         dev->unhash(dev, sk);
 555         }
 556         mutex_unlock(&device_mutex);
 557         ctx->unhash(sk);
 558 }
 559
 560 static int tls_hw_hash(struct sock *sk)
 561 {
 562         struct tls_context *ctx = tls_get_ctx(sk);
 563         struct tls_device *dev;
 564         int err;
 565
 566         err = ctx->hash(sk);
 567         mutex_lock(&device_mutex);
 568         list_for_each_entry(dev, &device_list, dev_list) {
 569                 if (dev->hash)
 570                         err |= dev->hash(dev, sk);
 571         }
 572         mutex_unlock(&device_mutex);
 573
 574         if (err)
 575                 tls_hw_unhash(sk);
 576         return err;
 577 }
 578
 579 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 580                          struct proto *base)
 581 {
 582         prot[TLS_BASE][TLS_BASE] = *base;
 583         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 584         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 585         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 586
 587         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 588         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 589         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 590
 591         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 592         prot[TLS_BASE][TLS_SW].recvmsg          = tls_sw_recvmsg;
 593         prot[TLS_BASE][TLS_SW].close            = tls_sk_proto_close;
 594
 595         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 596         prot[TLS_SW][TLS_SW].recvmsg    = tls_sw_recvmsg;
 597         prot[TLS_SW][TLS_SW].close      = tls_sk_proto_close;
 598
 599         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 600         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 601         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 602         prot[TLS_HW_RECORD][TLS_HW_RECORD].close        = tls_sk_proto_close;
 603 }
 604
 605 static int tls_init(struct sock *sk)
 606 {
 607         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 608         struct tls_context *ctx;
 609         int rc = 0;
 610
 611         if (tls_hw_prot(sk))
 612                 goto out;
 613
 614         /* The TLS ulp is currently supported only for TCP sockets
 615          * in ESTABLISHED state.
 616          * Supporting sockets in LISTEN state will require us
 617          * to modify the accept implementation to clone rather then
 618          * share the ulp context.
 619          */
 620         if (sk->sk_state != TCP_ESTABLISHED)
 621                 return -ENOTSUPP;
 622
 623         /* allocate tls context */
 624         ctx = create_ctx(sk);
 625         if (!ctx) {
 626                 rc = -ENOMEM;
 627                 goto out;
 628         }
 629         ctx->setsockopt = sk->sk_prot->setsockopt;
 630         ctx->getsockopt = sk->sk_prot->getsockopt;
 631         ctx->sk_proto_close = sk->sk_prot->close;
 632
 633         /* Build IPv6 TLS whenever the address of tcpv6_prot changes */
 634         if (ip_ver == TLSV6 &&
 635             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 636                 mutex_lock(&tcpv6_prot_mutex);
 637                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 638                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 639                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 640                 }
 641                 mutex_unlock(&tcpv6_prot_mutex);
 642         }
 643
 644         ctx->tx_conf = TLS_BASE;
 645         ctx->rx_conf = TLS_BASE;
 646         update_sk_prot(sk, ctx);
 647 out:
 648         return rc;
 649 }
 650
 651 void tls_register_device(struct tls_device *device)
 652 {
 653         mutex_lock(&device_mutex);
 654         list_add_tail(&device->dev_list, &device_list);
 655         mutex_unlock(&device_mutex);
 656 }
 657 EXPORT_SYMBOL(tls_register_device);
 658
 659 void tls_unregister_device(struct tls_device *device)
 660 {
 661         mutex_lock(&device_mutex);
 662         list_del(&device->dev_list);
 663         mutex_unlock(&device_mutex);
 664 }
 665 EXPORT_SYMBOL(tls_unregister_device);
 666
 667 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 668         .name                   = "tls",
 669         .uid                    = TCP_ULP_TLS,
 670         .user_visible           = true,
 671         .owner                  = THIS_MODULE,
 672         .init                   = tls_init,
 673 };
 674
 675 static int __init tls_register(void)
 676 {
 677         build_protos(tls_prots[TLSV4], &tcp_prot);
 678
 679         tls_sw_proto_ops = inet_stream_ops;
 680         tls_sw_proto_ops.poll = tls_sw_poll;
 681         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 682
 683         tcp_register_ulp(&tcp_tls_ulp_ops);
 684
 685         return 0;
 686 }
 687
 688 static void __exit tls_unregister(void)
 689 {
 690         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 691 }
 692
 693 module_init(tls_register);
 694 module_exit(tls_unregister);