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         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_partial_record(struct sock *sk, struct tls_context *ctx,
 196                             int flags)
 197 {
 198         struct scatterlist *sg;
 199         u16 offset;
 200
 201         sg = ctx->partially_sent_record;
 202         offset = ctx->partially_sent_offset;
 203
 204         ctx->partially_sent_record = NULL;
 205         return tls_push_sg(sk, ctx, sg, offset, flags);
 206 }
 207
 208 int tls_push_pending_closed_record(struct sock *sk,
 209                                    struct tls_context *tls_ctx,
 210                                    int flags, long *timeo)
 211 {
 212         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 213
 214         if (tls_is_partially_sent_record(tls_ctx) ||
 215             !list_empty(&ctx->tx_list))
 216                 return tls_tx_records(sk, flags);
 217         else
 218                 return tls_ctx->push_pending_record(sk, flags);
 219 }
 220
 221 static void tls_write_space(struct sock *sk)
 222 {
 223         struct tls_context *ctx = tls_get_ctx(sk);
 224         struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx);
 225
 226         /* If in_tcp_sendpages call lower protocol write space handler
 227          * to ensure we wake up any waiting operations there. For example
 228          * if do_tcp_sendpages where to call sk_wait_event.
 229          */
 230         if (ctx->in_tcp_sendpages) {
 231                 ctx->sk_write_space(sk);
 232                 return;
 233         }
 234
 235         /* Schedule the transmission if tx list is ready */
 236         if (is_tx_ready(tx_ctx) && !sk->sk_write_pending) {
 237                 /* Schedule the transmission */
 238                 if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))
 239                         schedule_delayed_work(&tx_ctx->tx_work.work, 0);
 240         }
 241
 242         ctx->sk_write_space(sk);
 243 }
 244
 245 static void tls_ctx_free(struct tls_context *ctx)
 246 {
 247         if (!ctx)
 248                 return;
 249
 250         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 251         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 252         kfree(ctx);
 253 }
 254
 255 static void tls_sk_proto_close(struct sock *sk, long timeout)
 256 {
 257         struct tls_context *ctx = tls_get_ctx(sk);
 258         long timeo = sock_sndtimeo(sk, 0);
 259         void (*sk_proto_close)(struct sock *sk, long timeout);
 260         bool free_ctx = false;
 261
 262         lock_sock(sk);
 263         sk_proto_close = ctx->sk_proto_close;
 264
 265         if ((ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD) ||
 266             (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE)) {
 267                 free_ctx = true;
 268                 goto skip_tx_cleanup;
 269         }
 270
 271         if (!tls_complete_pending_work(sk, ctx, 0, &timeo))
 272                 tls_handle_open_record(sk, 0);
 273
 274         /* We need these for tls_sw_fallback handling of other packets */
 275         if (ctx->tx_conf == TLS_SW) {
 276                 kfree(ctx->tx.rec_seq);
 277                 kfree(ctx->tx.iv);
 278                 tls_sw_free_resources_tx(sk);
 279         }
 280
 281         if (ctx->rx_conf == TLS_SW) {
 282                 kfree(ctx->rx.rec_seq);
 283                 kfree(ctx->rx.iv);
 284                 tls_sw_free_resources_rx(sk);
 285         }
 286
 287 #ifdef CONFIG_TLS_DEVICE
 288         if (ctx->rx_conf == TLS_HW)
 289                 tls_device_offload_cleanup_rx(sk);
 290
 291         if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) {
 292 #else
 293         {
 294 #endif
 295                 tls_ctx_free(ctx);
 296                 ctx = NULL;
 297         }
 298
 299 skip_tx_cleanup:
 300         release_sock(sk);
 301         sk_proto_close(sk, timeout);
 302         /* free ctx for TLS_HW_RECORD, used by tcp_set_state
 303          * for sk->sk_prot->unhash [tls_hw_unhash]
 304          */
 305         if (free_ctx)
 306                 tls_ctx_free(ctx);
 307 }
 308
 309 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 310                                 int __user *optlen)
 311 {
 312         int rc = 0;
 313         struct tls_context *ctx = tls_get_ctx(sk);
 314         struct tls_crypto_info *crypto_info;
 315         int len;
 316
 317         if (get_user(len, optlen))
 318                 return -EFAULT;
 319
 320         if (!optval || (len < sizeof(*crypto_info))) {
 321                 rc = -EINVAL;
 322                 goto out;
 323         }
 324
 325         if (!ctx) {
 326                 rc = -EBUSY;
 327                 goto out;
 328         }
 329
 330         /* get user crypto info */
 331         crypto_info = &ctx->crypto_send.info;
 332
 333         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 334                 rc = -EBUSY;
 335                 goto out;
 336         }
 337
 338         if (len == sizeof(*crypto_info)) {
 339                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 340                         rc = -EFAULT;
 341                 goto out;
 342         }
 343
 344         switch (crypto_info->cipher_type) {
 345         case TLS_CIPHER_AES_GCM_128: {
 346                 struct tls12_crypto_info_aes_gcm_128 *
 347                   crypto_info_aes_gcm_128 =
 348                   container_of(crypto_info,
 349                                struct tls12_crypto_info_aes_gcm_128,
 350                                info);
 351
 352                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 353                         rc = -EINVAL;
 354                         goto out;
 355                 }
 356                 lock_sock(sk);
 357                 memcpy(crypto_info_aes_gcm_128->iv,
 358                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 359                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 360                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 361                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 362                 release_sock(sk);
 363                 if (copy_to_user(optval,
 364                                  crypto_info_aes_gcm_128,
 365                                  sizeof(*crypto_info_aes_gcm_128)))
 366                         rc = -EFAULT;
 367                 break;
 368         }
 369         default:
 370                 rc = -EINVAL;
 371         }
 372
 373 out:
 374         return rc;
 375 }
 376
 377 static int do_tls_getsockopt(struct sock *sk, int optname,
 378                              char __user *optval, int __user *optlen)
 379 {
 380         int rc = 0;
 381
 382         switch (optname) {
 383         case TLS_TX:
 384                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 385                 break;
 386         default:
 387                 rc = -ENOPROTOOPT;
 388                 break;
 389         }
 390         return rc;
 391 }
 392
 393 static int tls_getsockopt(struct sock *sk, int level, int optname,
 394                           char __user *optval, int __user *optlen)
 395 {
 396         struct tls_context *ctx = tls_get_ctx(sk);
 397
 398         if (level != SOL_TLS)
 399                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 400
 401         return do_tls_getsockopt(sk, optname, optval, optlen);
 402 }
 403
 404 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 405                                   unsigned int optlen, int tx)
 406 {
 407         struct tls_crypto_info *crypto_info;
 408         struct tls_context *ctx = tls_get_ctx(sk);
 409         int rc = 0;
 410         int conf;
 411
 412         if (!optval || (optlen < sizeof(*crypto_info))) {
 413                 rc = -EINVAL;
 414                 goto out;
 415         }
 416
 417         if (tx)
 418                 crypto_info = &ctx->crypto_send.info;
 419         else
 420                 crypto_info = &ctx->crypto_recv.info;
 421
 422         /* Currently we don't support set crypto info more than one time */
 423         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 424                 rc = -EBUSY;
 425                 goto out;
 426         }
 427
 428         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 429         if (rc) {
 430                 rc = -EFAULT;
 431                 goto err_crypto_info;
 432         }
 433
 434         /* check version */
 435         if (crypto_info->version != TLS_1_2_VERSION) {
 436                 rc = -ENOTSUPP;
 437                 goto err_crypto_info;
 438         }
 439
 440         switch (crypto_info->cipher_type) {
 441         case TLS_CIPHER_AES_GCM_128: {
 442                 if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) {
 443                         rc = -EINVAL;
 444                         goto err_crypto_info;
 445                 }
 446                 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 447                                     optlen - sizeof(*crypto_info));
 448                 if (rc) {
 449                         rc = -EFAULT;
 450                         goto err_crypto_info;
 451                 }
 452                 break;
 453         }
 454         default:
 455                 rc = -EINVAL;
 456                 goto err_crypto_info;
 457         }
 458
 459         if (tx) {
 460 #ifdef CONFIG_TLS_DEVICE
 461                 rc = tls_set_device_offload(sk, ctx);
 462                 conf = TLS_HW;
 463                 if (rc) {
 464 #else
 465                 {
 466 #endif
 467                         rc = tls_set_sw_offload(sk, ctx, 1);
 468                         conf = TLS_SW;
 469                 }
 470         } else {
 471 #ifdef CONFIG_TLS_DEVICE
 472                 rc = tls_set_device_offload_rx(sk, ctx);
 473                 conf = TLS_HW;
 474                 if (rc) {
 475 #else
 476                 {
 477 #endif
 478                         rc = tls_set_sw_offload(sk, ctx, 0);
 479                         conf = TLS_SW;
 480                 }
 481         }
 482
 483         if (rc)
 484                 goto err_crypto_info;
 485
 486         if (tx)
 487                 ctx->tx_conf = conf;
 488         else
 489                 ctx->rx_conf = conf;
 490         update_sk_prot(sk, ctx);
 491         if (tx) {
 492                 ctx->sk_write_space = sk->sk_write_space;
 493                 sk->sk_write_space = tls_write_space;
 494         } else {
 495                 sk->sk_socket->ops = &tls_sw_proto_ops;
 496         }
 497         goto out;
 498
 499 err_crypto_info:
 500         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 501 out:
 502         return rc;
 503 }
 504
 505 static int do_tls_setsockopt(struct sock *sk, int optname,
 506                              char __user *optval, unsigned int optlen)
 507 {
 508         int rc = 0;
 509
 510         switch (optname) {
 511         case TLS_TX:
 512         case TLS_RX:
 513                 lock_sock(sk);
 514                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 515                                             optname == TLS_TX);
 516                 release_sock(sk);
 517                 break;
 518         default:
 519                 rc = -ENOPROTOOPT;
 520                 break;
 521         }
 522         return rc;
 523 }
 524
 525 static int tls_setsockopt(struct sock *sk, int level, int optname,
 526                           char __user *optval, unsigned int optlen)
 527 {
 528         struct tls_context *ctx = tls_get_ctx(sk);
 529
 530         if (level != SOL_TLS)
 531                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 532
 533         return do_tls_setsockopt(sk, optname, optval, optlen);
 534 }
 535
 536 static struct tls_context *create_ctx(struct sock *sk)
 537 {
 538         struct inet_connection_sock *icsk = inet_csk(sk);
 539         struct tls_context *ctx;
 540
 541         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 542         if (!ctx)
 543                 return NULL;
 544
 545         icsk->icsk_ulp_data = ctx;
 546         return ctx;
 547 }
 548
 549 static int tls_hw_prot(struct sock *sk)
 550 {
 551         struct tls_context *ctx;
 552         struct tls_device *dev;
 553         int rc = 0;
 554
 555         mutex_lock(&device_mutex);
 556         list_for_each_entry(dev, &device_list, dev_list) {
 557                 if (dev->feature && dev->feature(dev)) {
 558                         ctx = create_ctx(sk);
 559                         if (!ctx)
 560                                 goto out;
 561
 562                         ctx->hash = sk->sk_prot->hash;
 563                         ctx->unhash = sk->sk_prot->unhash;
 564                         ctx->sk_proto_close = sk->sk_prot->close;
 565                         ctx->rx_conf = TLS_HW_RECORD;
 566                         ctx->tx_conf = TLS_HW_RECORD;
 567                         update_sk_prot(sk, ctx);
 568                         rc = 1;
 569                         break;
 570                 }
 571         }
 572 out:
 573         mutex_unlock(&device_mutex);
 574         return rc;
 575 }
 576
 577 static void tls_hw_unhash(struct sock *sk)
 578 {
 579         struct tls_context *ctx = tls_get_ctx(sk);
 580         struct tls_device *dev;
 581
 582         mutex_lock(&device_mutex);
 583         list_for_each_entry(dev, &device_list, dev_list) {
 584                 if (dev->unhash)
 585                         dev->unhash(dev, sk);
 586         }
 587         mutex_unlock(&device_mutex);
 588         ctx->unhash(sk);
 589 }
 590
 591 static int tls_hw_hash(struct sock *sk)
 592 {
 593         struct tls_context *ctx = tls_get_ctx(sk);
 594         struct tls_device *dev;
 595         int err;
 596
 597         err = ctx->hash(sk);
 598         mutex_lock(&device_mutex);
 599         list_for_each_entry(dev, &device_list, dev_list) {
 600                 if (dev->hash)
 601                         err |= dev->hash(dev, sk);
 602         }
 603         mutex_unlock(&device_mutex);
 604
 605         if (err)
 606                 tls_hw_unhash(sk);
 607         return err;
 608 }
 609
 610 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 611                          struct proto *base)
 612 {
 613         prot[TLS_BASE][TLS_BASE] = *base;
 614         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 615         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 616         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 617
 618         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 619         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 620         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 621
 622         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 623         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 624         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 625         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 626
 627         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 628         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 629         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 630         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 631
 632 #ifdef CONFIG_TLS_DEVICE
 633         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 634         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 635         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 636
 637         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 638         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 639         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 640
 641         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 642
 643         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 644
 645         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 646 #endif
 647
 648         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 649         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 650         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 651         prot[TLS_HW_RECORD][TLS_HW_RECORD].close        = tls_sk_proto_close;
 652 }
 653
 654 static int tls_init(struct sock *sk)
 655 {
 656         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 657         struct tls_context *ctx;
 658         int rc = 0;
 659
 660         if (tls_hw_prot(sk))
 661                 goto out;
 662
 663         /* The TLS ulp is currently supported only for TCP sockets
 664          * in ESTABLISHED state.
 665          * Supporting sockets in LISTEN state will require us
 666          * to modify the accept implementation to clone rather then
 667          * share the ulp context.
 668          */
 669         if (sk->sk_state != TCP_ESTABLISHED)
 670                 return -ENOTSUPP;
 671
 672         /* allocate tls context */
 673         ctx = create_ctx(sk);
 674         if (!ctx) {
 675                 rc = -ENOMEM;
 676                 goto out;
 677         }
 678         ctx->setsockopt = sk->sk_prot->setsockopt;
 679         ctx->getsockopt = sk->sk_prot->getsockopt;
 680         ctx->sk_proto_close = sk->sk_prot->close;
 681
 682         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 683         if (ip_ver == TLSV6 &&
 684             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 685                 mutex_lock(&tcpv6_prot_mutex);
 686                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 687                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 688                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 689                 }
 690                 mutex_unlock(&tcpv6_prot_mutex);
 691         }
 692
 693         ctx->tx_conf = TLS_BASE;
 694         ctx->rx_conf = TLS_BASE;
 695         update_sk_prot(sk, ctx);
 696 out:
 697         return rc;
 698 }
 699
 700 void tls_register_device(struct tls_device *device)
 701 {
 702         mutex_lock(&device_mutex);
 703         list_add_tail(&device->dev_list, &device_list);
 704         mutex_unlock(&device_mutex);
 705 }
 706 EXPORT_SYMBOL(tls_register_device);
 707
 708 void tls_unregister_device(struct tls_device *device)
 709 {
 710         mutex_lock(&device_mutex);
 711         list_del(&device->dev_list);
 712         mutex_unlock(&device_mutex);
 713 }
 714 EXPORT_SYMBOL(tls_unregister_device);
 715
 716 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 717         .name                   = "tls",
 718         .owner                  = THIS_MODULE,
 719         .init                   = tls_init,
 720 };
 721
 722 static int __init tls_register(void)
 723 {
 724         build_protos(tls_prots[TLSV4], &tcp_prot);
 725
 726         tls_sw_proto_ops = inet_stream_ops;
 727         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 728
 729 #ifdef CONFIG_TLS_DEVICE
 730         tls_device_init();
 731 #endif
 732         tcp_register_ulp(&tcp_tls_ulp_ops);
 733
 734         return 0;
 735 }
 736
 737 static void __exit tls_unregister(void)
 738 {
 739         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 740 #ifdef CONFIG_TLS_DEVICE
 741         tls_device_cleanup();
 742 #endif
 743 }
 744
 745 module_init(tls_register);
 746 module_exit(tls_unregister);