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 MODULE_ALIAS_TCP_ULP("tls");
  49
  50 enum {
  51         TLSV4,
  52         TLSV6,
  53         TLS_NUM_PROTS,
  54 };
  55
  56 static struct proto *saved_tcpv6_prot;
  57 static DEFINE_MUTEX(tcpv6_prot_mutex);
  58 static LIST_HEAD(device_list);
  59 static DEFINE_MUTEX(device_mutex);
  60 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  61 static struct proto_ops tls_sw_proto_ops;
  62
  63 static void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  64 {
  65         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  66
  67         sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf];
  68 }
  69
  70 int wait_on_pending_writer(struct sock *sk, long *timeo)
  71 {
  72         int rc = 0;
  73         DEFINE_WAIT_FUNC(wait, woken_wake_function);
  74
  75         add_wait_queue(sk_sleep(sk), &wait);
  76         while (1) {
  77                 if (!*timeo) {
  78                         rc = -EAGAIN;
  79                         break;
  80                 }
  81
  82                 if (signal_pending(current)) {
  83                         rc = sock_intr_errno(*timeo);
  84                         break;
  85                 }
  86
  87                 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
  88                         break;
  89         }
  90         remove_wait_queue(sk_sleep(sk), &wait);
  91         return rc;
  92 }
  93
  94 int tls_push_sg(struct sock *sk,
  95                 struct tls_context *ctx,
  96                 struct scatterlist *sg,
  97                 u16 first_offset,
  98                 int flags)
  99 {
 100         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 101         int ret = 0;
 102         struct page *p;
 103         size_t size;
 104         int offset = first_offset;
 105
 106         size = sg->length - offset;
 107         offset += sg->offset;
 108
 109         ctx->in_tcp_sendpages = true;
 110         while (1) {
 111                 if (sg_is_last(sg))
 112                         sendpage_flags = flags;
 113
 114                 /* is sending application-limited? */
 115                 tcp_rate_check_app_limited(sk);
 116                 p = sg_page(sg);
 117 retry:
 118                 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
 119
 120                 if (ret != size) {
 121                         if (ret > 0) {
 122                                 offset += ret;
 123                                 size -= ret;
 124                                 goto retry;
 125                         }
 126
 127                         offset -= sg->offset;
 128                         ctx->partially_sent_offset = offset;
 129                         ctx->partially_sent_record = (void *)sg;
 130                         ctx->in_tcp_sendpages = false;
 131                         return ret;
 132                 }
 133
 134                 put_page(p);
 135                 sk_mem_uncharge(sk, sg->length);
 136                 sg = sg_next(sg);
 137                 if (!sg)
 138                         break;
 139
 140                 offset = sg->offset;
 141                 size = sg->length;
 142         }
 143
 144         clear_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
 145         ctx->in_tcp_sendpages = false;
 146         ctx->sk_write_space(sk);
 147
 148         return 0;
 149 }
 150
 151 static int tls_handle_open_record(struct sock *sk, int flags)
 152 {
 153         struct tls_context *ctx = tls_get_ctx(sk);
 154
 155         if (tls_is_pending_open_record(ctx))
 156                 return ctx->push_pending_record(sk, flags);
 157
 158         return 0;
 159 }
 160
 161 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 162                       unsigned char *record_type)
 163 {
 164         struct cmsghdr *cmsg;
 165         int rc = -EINVAL;
 166
 167         for_each_cmsghdr(cmsg, msg) {
 168                 if (!CMSG_OK(msg, cmsg))
 169                         return -EINVAL;
 170                 if (cmsg->cmsg_level != SOL_TLS)
 171                         continue;
 172
 173                 switch (cmsg->cmsg_type) {
 174                 case TLS_SET_RECORD_TYPE:
 175                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 176                                 return -EINVAL;
 177
 178                         if (msg->msg_flags & MSG_MORE)
 179                                 return -EINVAL;
 180
 181                         rc = tls_handle_open_record(sk, msg->msg_flags);
 182                         if (rc)
 183                                 return rc;
 184
 185                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 186                         rc = 0;
 187                         break;
 188                 default:
 189                         return -EINVAL;
 190                 }
 191         }
 192
 193         return rc;
 194 }
 195
 196 int tls_push_pending_closed_record(struct sock *sk, struct tls_context *ctx,
 197                                    int flags, long *timeo)
 198 {
 199         struct scatterlist *sg;
 200         u16 offset;
 201
 202         if (!tls_is_partially_sent_record(ctx))
 203                 return ctx->push_pending_record(sk, flags);
 204
 205         sg = ctx->partially_sent_record;
 206         offset = ctx->partially_sent_offset;
 207
 208         ctx->partially_sent_record = NULL;
 209         return tls_push_sg(sk, ctx, sg, offset, flags);
 210 }
 211
 212 static void tls_write_space(struct sock *sk)
 213 {
 214         struct tls_context *ctx = tls_get_ctx(sk);
 215
 216         /* If in_tcp_sendpages call lower protocol write space handler
 217          * to ensure we wake up any waiting operations there. For example
 218          * if do_tcp_sendpages where to call sk_wait_event.
 219          */
 220         if (ctx->in_tcp_sendpages) {
 221                 ctx->sk_write_space(sk);
 222                 return;
 223         }
 224
 225         if (!sk->sk_write_pending && tls_is_pending_closed_record(ctx)) {
 226                 gfp_t sk_allocation = sk->sk_allocation;
 227                 int rc;
 228                 long timeo = 0;
 229
 230                 sk->sk_allocation = GFP_ATOMIC;
 231                 rc = tls_push_pending_closed_record(sk, ctx,
 232                                                     MSG_DONTWAIT |
 233                                                     MSG_NOSIGNAL,
 234                                                     &timeo);
 235                 sk->sk_allocation = sk_allocation;
 236
 237                 if (rc < 0)
 238                         return;
 239         }
 240
 241         ctx->sk_write_space(sk);
 242 }
 243
 244 static void tls_ctx_free(struct tls_context *ctx)
 245 {
 246         if (!ctx)
 247                 return;
 248
 249         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 250         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 251         kfree(ctx);
 252 }
 253
 254 static void tls_sk_proto_close(struct sock *sk, long timeout)
 255 {
 256         struct tls_context *ctx = tls_get_ctx(sk);
 257         long timeo = sock_sndtimeo(sk, 0);
 258         void (*sk_proto_close)(struct sock *sk, long timeout);
 259         bool free_ctx = false;
 260
 261         lock_sock(sk);
 262         sk_proto_close = ctx->sk_proto_close;
 263
 264         if ((ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD) ||
 265             (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE)) {
 266                 free_ctx = true;
 267                 goto skip_tx_cleanup;
 268         }
 269
 270         if (!tls_complete_pending_work(sk, ctx, 0, &timeo))
 271                 tls_handle_open_record(sk, 0);
 272
 273         if (ctx->partially_sent_record) {
 274                 struct scatterlist *sg = ctx->partially_sent_record;
 275
 276                 while (1) {
 277                         put_page(sg_page(sg));
 278                         sk_mem_uncharge(sk, sg->length);
 279
 280                         if (sg_is_last(sg))
 281                                 break;
 282                         sg++;
 283                 }
 284         }
 285
 286         /* We need these for tls_sw_fallback handling of other packets */
 287         if (ctx->tx_conf == TLS_SW) {
 288                 kfree(ctx->tx.rec_seq);
 289                 kfree(ctx->tx.iv);
 290                 tls_sw_free_resources_tx(sk);
 291         }
 292
 293         if (ctx->rx_conf == TLS_SW) {
 294                 kfree(ctx->rx.rec_seq);
 295                 kfree(ctx->rx.iv);
 296                 tls_sw_free_resources_rx(sk);
 297         }
 298
 299 #ifdef CONFIG_TLS_DEVICE
 300         if (ctx->rx_conf == TLS_HW)
 301                 tls_device_offload_cleanup_rx(sk);
 302
 303         if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) {
 304 #else
 305         {
 306 #endif
 307                 tls_ctx_free(ctx);
 308                 ctx = NULL;
 309         }
 310
 311 skip_tx_cleanup:
 312         release_sock(sk);
 313         sk_proto_close(sk, timeout);
 314         /* free ctx for TLS_HW_RECORD, used by tcp_set_state
 315          * for sk->sk_prot->unhash [tls_hw_unhash]
 316          */
 317         if (free_ctx)
 318                 tls_ctx_free(ctx);
 319 }
 320
 321 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 322                                 int __user *optlen)
 323 {
 324         int rc = 0;
 325         struct tls_context *ctx = tls_get_ctx(sk);
 326         struct tls_crypto_info *crypto_info;
 327         int len;
 328
 329         if (get_user(len, optlen))
 330                 return -EFAULT;
 331
 332         if (!optval || (len < sizeof(*crypto_info))) {
 333                 rc = -EINVAL;
 334                 goto out;
 335         }
 336
 337         if (!ctx) {
 338                 rc = -EBUSY;
 339                 goto out;
 340         }
 341
 342         /* get user crypto info */
 343         crypto_info = &ctx->crypto_send.info;
 344
 345         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 346                 rc = -EBUSY;
 347                 goto out;
 348         }
 349
 350         if (len == sizeof(*crypto_info)) {
 351                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 352                         rc = -EFAULT;
 353                 goto out;
 354         }
 355
 356         switch (crypto_info->cipher_type) {
 357         case TLS_CIPHER_AES_GCM_128: {
 358                 struct tls12_crypto_info_aes_gcm_128 *
 359                   crypto_info_aes_gcm_128 =
 360                   container_of(crypto_info,
 361                                struct tls12_crypto_info_aes_gcm_128,
 362                                info);
 363
 364                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 365                         rc = -EINVAL;
 366                         goto out;
 367                 }
 368                 lock_sock(sk);
 369                 memcpy(crypto_info_aes_gcm_128->iv,
 370                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 371                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 372                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 373                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 374                 release_sock(sk);
 375                 if (copy_to_user(optval,
 376                                  crypto_info_aes_gcm_128,
 377                                  sizeof(*crypto_info_aes_gcm_128)))
 378                         rc = -EFAULT;
 379                 break;
 380         }
 381         default:
 382                 rc = -EINVAL;
 383         }
 384
 385 out:
 386         return rc;
 387 }
 388
 389 static int do_tls_getsockopt(struct sock *sk, int optname,
 390                              char __user *optval, int __user *optlen)
 391 {
 392         int rc = 0;
 393
 394         switch (optname) {
 395         case TLS_TX:
 396                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 397                 break;
 398         default:
 399                 rc = -ENOPROTOOPT;
 400                 break;
 401         }
 402         return rc;
 403 }
 404
 405 static int tls_getsockopt(struct sock *sk, int level, int optname,
 406                           char __user *optval, int __user *optlen)
 407 {
 408         struct tls_context *ctx = tls_get_ctx(sk);
 409
 410         if (level != SOL_TLS)
 411                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 412
 413         return do_tls_getsockopt(sk, optname, optval, optlen);
 414 }
 415
 416 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 417                                   unsigned int optlen, int tx)
 418 {
 419         struct tls_crypto_info *crypto_info;
 420         struct tls_context *ctx = tls_get_ctx(sk);
 421         int rc = 0;
 422         int conf;
 423
 424         if (!optval || (optlen < sizeof(*crypto_info))) {
 425                 rc = -EINVAL;
 426                 goto out;
 427         }
 428
 429         if (tx)
 430                 crypto_info = &ctx->crypto_send.info;
 431         else
 432                 crypto_info = &ctx->crypto_recv.info;
 433
 434         /* Currently we don't support set crypto info more than one time */
 435         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 436                 rc = -EBUSY;
 437                 goto out;
 438         }
 439
 440         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 441         if (rc) {
 442                 rc = -EFAULT;
 443                 goto err_crypto_info;
 444         }
 445
 446         /* check version */
 447         if (crypto_info->version != TLS_1_2_VERSION) {
 448                 rc = -ENOTSUPP;
 449                 goto err_crypto_info;
 450         }
 451
 452         switch (crypto_info->cipher_type) {
 453         case TLS_CIPHER_AES_GCM_128: {
 454                 if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) {
 455                         rc = -EINVAL;
 456                         goto err_crypto_info;
 457                 }
 458                 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 459                                     optlen - sizeof(*crypto_info));
 460                 if (rc) {
 461                         rc = -EFAULT;
 462                         goto err_crypto_info;
 463                 }
 464                 break;
 465         }
 466         default:
 467                 rc = -EINVAL;
 468                 goto err_crypto_info;
 469         }
 470
 471         if (tx) {
 472 #ifdef CONFIG_TLS_DEVICE
 473                 rc = tls_set_device_offload(sk, ctx);
 474                 conf = TLS_HW;
 475                 if (rc) {
 476 #else
 477                 {
 478 #endif
 479                         rc = tls_set_sw_offload(sk, ctx, 1);
 480                         conf = TLS_SW;
 481                 }
 482         } else {
 483 #ifdef CONFIG_TLS_DEVICE
 484                 rc = tls_set_device_offload_rx(sk, ctx);
 485                 conf = TLS_HW;
 486                 if (rc) {
 487 #else
 488                 {
 489 #endif
 490                         rc = tls_set_sw_offload(sk, ctx, 0);
 491                         conf = TLS_SW;
 492                 }
 493         }
 494
 495         if (rc)
 496                 goto err_crypto_info;
 497
 498         if (tx)
 499                 ctx->tx_conf = conf;
 500         else
 501                 ctx->rx_conf = conf;
 502         update_sk_prot(sk, ctx);
 503         if (tx) {
 504                 ctx->sk_write_space = sk->sk_write_space;
 505                 sk->sk_write_space = tls_write_space;
 506         } else {
 507                 sk->sk_socket->ops = &tls_sw_proto_ops;
 508         }
 509         goto out;
 510
 511 err_crypto_info:
 512         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 513 out:
 514         return rc;
 515 }
 516
 517 static int do_tls_setsockopt(struct sock *sk, int optname,
 518                              char __user *optval, unsigned int optlen)
 519 {
 520         int rc = 0;
 521
 522         switch (optname) {
 523         case TLS_TX:
 524         case TLS_RX:
 525                 lock_sock(sk);
 526                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 527                                             optname == TLS_TX);
 528                 release_sock(sk);
 529                 break;
 530         default:
 531                 rc = -ENOPROTOOPT;
 532                 break;
 533         }
 534         return rc;
 535 }
 536
 537 static int tls_setsockopt(struct sock *sk, int level, int optname,
 538                           char __user *optval, unsigned int optlen)
 539 {
 540         struct tls_context *ctx = tls_get_ctx(sk);
 541
 542         if (level != SOL_TLS)
 543                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 544
 545         return do_tls_setsockopt(sk, optname, optval, optlen);
 546 }
 547
 548 static struct tls_context *create_ctx(struct sock *sk)
 549 {
 550         struct inet_connection_sock *icsk = inet_csk(sk);
 551         struct tls_context *ctx;
 552
 553         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 554         if (!ctx)
 555                 return NULL;
 556
 557         icsk->icsk_ulp_data = ctx;
 558         return ctx;
 559 }
 560
 561 static int tls_hw_prot(struct sock *sk)
 562 {
 563         struct tls_context *ctx;
 564         struct tls_device *dev;
 565         int rc = 0;
 566
 567         mutex_lock(&device_mutex);
 568         list_for_each_entry(dev, &device_list, dev_list) {
 569                 if (dev->feature && dev->feature(dev)) {
 570                         ctx = create_ctx(sk);
 571                         if (!ctx)
 572                                 goto out;
 573
 574                         ctx->hash = sk->sk_prot->hash;
 575                         ctx->unhash = sk->sk_prot->unhash;
 576                         ctx->sk_proto_close = sk->sk_prot->close;
 577                         ctx->rx_conf = TLS_HW_RECORD;
 578                         ctx->tx_conf = TLS_HW_RECORD;
 579                         update_sk_prot(sk, ctx);
 580                         rc = 1;
 581                         break;
 582                 }
 583         }
 584 out:
 585         mutex_unlock(&device_mutex);
 586         return rc;
 587 }
 588
 589 static void tls_hw_unhash(struct sock *sk)
 590 {
 591         struct tls_context *ctx = tls_get_ctx(sk);
 592         struct tls_device *dev;
 593
 594         mutex_lock(&device_mutex);
 595         list_for_each_entry(dev, &device_list, dev_list) {
 596                 if (dev->unhash)
 597                         dev->unhash(dev, sk);
 598         }
 599         mutex_unlock(&device_mutex);
 600         ctx->unhash(sk);
 601 }
 602
 603 static int tls_hw_hash(struct sock *sk)
 604 {
 605         struct tls_context *ctx = tls_get_ctx(sk);
 606         struct tls_device *dev;
 607         int err;
 608
 609         err = ctx->hash(sk);
 610         mutex_lock(&device_mutex);
 611         list_for_each_entry(dev, &device_list, dev_list) {
 612                 if (dev->hash)
 613                         err |= dev->hash(dev, sk);
 614         }
 615         mutex_unlock(&device_mutex);
 616
 617         if (err)
 618                 tls_hw_unhash(sk);
 619         return err;
 620 }
 621
 622 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 623                          struct proto *base)
 624 {
 625         prot[TLS_BASE][TLS_BASE] = *base;
 626         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 627         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 628         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 629
 630         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 631         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 632         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 633
 634         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 635         prot[TLS_BASE][TLS_SW].recvmsg          = tls_sw_recvmsg;
 636         prot[TLS_BASE][TLS_SW].close            = tls_sk_proto_close;
 637
 638         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 639         prot[TLS_SW][TLS_SW].recvmsg    = tls_sw_recvmsg;
 640         prot[TLS_SW][TLS_SW].close      = tls_sk_proto_close;
 641
 642 #ifdef CONFIG_TLS_DEVICE
 643         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 644         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 645         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 646
 647         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 648         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 649         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 650
 651         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 652
 653         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 654
 655         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 656 #endif
 657
 658         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 659         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 660         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 661         prot[TLS_HW_RECORD][TLS_HW_RECORD].close        = tls_sk_proto_close;
 662 }
 663
 664 static int tls_init(struct sock *sk)
 665 {
 666         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 667         struct tls_context *ctx;
 668         int rc = 0;
 669
 670         if (tls_hw_prot(sk))
 671                 goto out;
 672
 673         /* The TLS ulp is currently supported only for TCP sockets
 674          * in ESTABLISHED state.
 675          * Supporting sockets in LISTEN state will require us
 676          * to modify the accept implementation to clone rather then
 677          * share the ulp context.
 678          */
 679         if (sk->sk_state != TCP_ESTABLISHED)
 680                 return -ENOTSUPP;
 681
 682         /* allocate tls context */
 683         ctx = create_ctx(sk);
 684         if (!ctx) {
 685                 rc = -ENOMEM;
 686                 goto out;
 687         }
 688         ctx->setsockopt = sk->sk_prot->setsockopt;
 689         ctx->getsockopt = sk->sk_prot->getsockopt;
 690         ctx->sk_proto_close = sk->sk_prot->close;
 691
 692         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 693         if (ip_ver == TLSV6 &&
 694             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 695                 mutex_lock(&tcpv6_prot_mutex);
 696                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 697                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 698                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 699                 }
 700                 mutex_unlock(&tcpv6_prot_mutex);
 701         }
 702
 703         ctx->tx_conf = TLS_BASE;
 704         ctx->rx_conf = TLS_BASE;
 705         update_sk_prot(sk, ctx);
 706 out:
 707         return rc;
 708 }
 709
 710 void tls_register_device(struct tls_device *device)
 711 {
 712         mutex_lock(&device_mutex);
 713         list_add_tail(&device->dev_list, &device_list);
 714         mutex_unlock(&device_mutex);
 715 }
 716 EXPORT_SYMBOL(tls_register_device);
 717
 718 void tls_unregister_device(struct tls_device *device)
 719 {
 720         mutex_lock(&device_mutex);
 721         list_del(&device->dev_list);
 722         mutex_unlock(&device_mutex);
 723 }
 724 EXPORT_SYMBOL(tls_unregister_device);
 725
 726 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 727         .name                   = "tls",
 728         .uid                    = TCP_ULP_TLS,
 729         .user_visible           = true,
 730         .owner                  = THIS_MODULE,
 731         .init                   = tls_init,
 732 };
 733
 734 static int __init tls_register(void)
 735 {
 736         build_protos(tls_prots[TLSV4], &tcp_prot);
 737
 738         tls_sw_proto_ops = inet_stream_ops;
 739         tls_sw_proto_ops.poll = tls_sw_poll;
 740         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 741
 742 #ifdef CONFIG_TLS_DEVICE
 743         tls_device_init();
 744 #endif
 745         tcp_register_ulp(&tcp_tls_ulp_ops);
 746
 747         return 0;
 748 }
 749
 750 static void __exit tls_unregister(void)
 751 {
 752         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 753 #ifdef CONFIG_TLS_DEVICE
 754         tls_device_cleanup();
 755 #endif
 756 }
 757
 758 module_init(tls_register);
 759 module_exit(tls_unregister);