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 struct proto *saved_tcpv4_prot;
  59 static DEFINE_MUTEX(tcpv4_prot_mutex);
  60 static LIST_HEAD(device_list);
  61 static DEFINE_SPINLOCK(device_spinlock);
  62 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  63 static struct proto_ops tls_sw_proto_ops;
  64 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
  65                          struct proto *base);
  66
  67 static void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  68 {
  69         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  70
  71         sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf];
  72 }
  73
  74 int wait_on_pending_writer(struct sock *sk, long *timeo)
  75 {
  76         int rc = 0;
  77         DEFINE_WAIT_FUNC(wait, woken_wake_function);
  78
  79         add_wait_queue(sk_sleep(sk), &wait);
  80         while (1) {
  81                 if (!*timeo) {
  82                         rc = -EAGAIN;
  83                         break;
  84                 }
  85
  86                 if (signal_pending(current)) {
  87                         rc = sock_intr_errno(*timeo);
  88                         break;
  89                 }
  90
  91                 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
  92                         break;
  93         }
  94         remove_wait_queue(sk_sleep(sk), &wait);
  95         return rc;
  96 }
  97
  98 int tls_push_sg(struct sock *sk,
  99                 struct tls_context *ctx,
 100                 struct scatterlist *sg,
 101                 u16 first_offset,
 102                 int flags)
 103 {
 104         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 105         int ret = 0;
 106         struct page *p;
 107         size_t size;
 108         int offset = first_offset;
 109
 110         size = sg->length - offset;
 111         offset += sg->offset;
 112
 113         ctx->in_tcp_sendpages = true;
 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                         ctx->in_tcp_sendpages = false;
 135                         return ret;
 136                 }
 137
 138                 put_page(p);
 139                 sk_mem_uncharge(sk, sg->length);
 140                 sg = sg_next(sg);
 141                 if (!sg)
 142                         break;
 143
 144                 offset = sg->offset;
 145                 size = sg->length;
 146         }
 147
 148         ctx->in_tcp_sendpages = false;
 149
 150         return 0;
 151 }
 152
 153 static int tls_handle_open_record(struct sock *sk, int flags)
 154 {
 155         struct tls_context *ctx = tls_get_ctx(sk);
 156
 157         if (tls_is_pending_open_record(ctx))
 158                 return ctx->push_pending_record(sk, flags);
 159
 160         return 0;
 161 }
 162
 163 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 164                       unsigned char *record_type)
 165 {
 166         struct cmsghdr *cmsg;
 167         int rc = -EINVAL;
 168
 169         for_each_cmsghdr(cmsg, msg) {
 170                 if (!CMSG_OK(msg, cmsg))
 171                         return -EINVAL;
 172                 if (cmsg->cmsg_level != SOL_TLS)
 173                         continue;
 174
 175                 switch (cmsg->cmsg_type) {
 176                 case TLS_SET_RECORD_TYPE:
 177                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 178                                 return -EINVAL;
 179
 180                         if (msg->msg_flags & MSG_MORE)
 181                                 return -EINVAL;
 182
 183                         rc = tls_handle_open_record(sk, msg->msg_flags);
 184                         if (rc)
 185                                 return rc;
 186
 187                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 188                         rc = 0;
 189                         break;
 190                 default:
 191                         return -EINVAL;
 192                 }
 193         }
 194
 195         return rc;
 196 }
 197
 198 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 199                             int flags)
 200 {
 201         struct scatterlist *sg;
 202         u16 offset;
 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 bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 212 {
 213         struct scatterlist *sg;
 214
 215         sg = ctx->partially_sent_record;
 216         if (!sg)
 217                 return false;
 218
 219         while (1) {
 220                 put_page(sg_page(sg));
 221                 sk_mem_uncharge(sk, sg->length);
 222
 223                 if (sg_is_last(sg))
 224                         break;
 225                 sg++;
 226         }
 227         ctx->partially_sent_record = NULL;
 228         return true;
 229 }
 230
 231 static void tls_write_space(struct sock *sk)
 232 {
 233         struct tls_context *ctx = tls_get_ctx(sk);
 234
 235         /* If in_tcp_sendpages call lower protocol write space handler
 236          * to ensure we wake up any waiting operations there. For example
 237          * if do_tcp_sendpages where to call sk_wait_event.
 238          */
 239         if (ctx->in_tcp_sendpages) {
 240                 ctx->sk_write_space(sk);
 241                 return;
 242         }
 243
 244 #ifdef CONFIG_TLS_DEVICE
 245         if (ctx->tx_conf == TLS_HW)
 246                 tls_device_write_space(sk, ctx);
 247         else
 248 #endif
 249                 tls_sw_write_space(sk, ctx);
 250
 251         ctx->sk_write_space(sk);
 252 }
 253
 254 void tls_ctx_free(struct tls_context *ctx)
 255 {
 256         if (!ctx)
 257                 return;
 258
 259         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 260         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 261         kfree(ctx);
 262 }
 263
 264 static void tls_sk_proto_cleanup(struct sock *sk,
 265                                  struct tls_context *ctx, long timeo)
 266 {
 267         if (unlikely(sk->sk_write_pending) &&
 268             !wait_on_pending_writer(sk, &timeo))
 269                 tls_handle_open_record(sk, 0);
 270
 271         /* We need these for tls_sw_fallback handling of other packets */
 272         if (ctx->tx_conf == TLS_SW) {
 273                 kfree(ctx->tx.rec_seq);
 274                 kfree(ctx->tx.iv);
 275                 tls_sw_release_resources_tx(sk);
 276 #ifdef CONFIG_TLS_DEVICE
 277         } else if (ctx->tx_conf == TLS_HW) {
 278                 tls_device_free_resources_tx(sk);
 279 #endif
 280         }
 281
 282         if (ctx->rx_conf == TLS_SW)
 283                 tls_sw_release_resources_rx(sk);
 284
 285 #ifdef CONFIG_TLS_DEVICE
 286         if (ctx->rx_conf == TLS_HW)
 287                 tls_device_offload_cleanup_rx(sk);
 288 #endif
 289 }
 290
 291 static void tls_sk_proto_close(struct sock *sk, long timeout)
 292 {
 293         void (*sk_proto_close)(struct sock *sk, long timeout);
 294         struct tls_context *ctx = tls_get_ctx(sk);
 295         long timeo = sock_sndtimeo(sk, 0);
 296         bool free_ctx;
 297
 298         if (ctx->tx_conf == TLS_SW)
 299                 tls_sw_cancel_work_tx(ctx);
 300
 301         lock_sock(sk);
 302         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 303         sk_proto_close = ctx->sk_proto_close;
 304
 305         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 306                 tls_sk_proto_cleanup(sk, ctx, timeo);
 307
 308         release_sock(sk);
 309         if (ctx->tx_conf == TLS_SW)
 310                 tls_sw_free_ctx_tx(ctx);
 311         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 312                 tls_sw_strparser_done(ctx);
 313         if (ctx->rx_conf == TLS_SW)
 314                 tls_sw_free_ctx_rx(ctx);
 315         sk_proto_close(sk, timeout);
 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         case TLS_CIPHER_AES_GCM_256: {
 382                 struct tls12_crypto_info_aes_gcm_256 *
 383                   crypto_info_aes_gcm_256 =
 384                   container_of(crypto_info,
 385                                struct tls12_crypto_info_aes_gcm_256,
 386                                info);
 387
 388                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 389                         rc = -EINVAL;
 390                         goto out;
 391                 }
 392                 lock_sock(sk);
 393                 memcpy(crypto_info_aes_gcm_256->iv,
 394                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 395                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 396                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 397                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 398                 release_sock(sk);
 399                 if (copy_to_user(optval,
 400                                  crypto_info_aes_gcm_256,
 401                                  sizeof(*crypto_info_aes_gcm_256)))
 402                         rc = -EFAULT;
 403                 break;
 404         }
 405         default:
 406                 rc = -EINVAL;
 407         }
 408
 409 out:
 410         return rc;
 411 }
 412
 413 static int do_tls_getsockopt(struct sock *sk, int optname,
 414                              char __user *optval, int __user *optlen)
 415 {
 416         int rc = 0;
 417
 418         switch (optname) {
 419         case TLS_TX:
 420                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 421                 break;
 422         default:
 423                 rc = -ENOPROTOOPT;
 424                 break;
 425         }
 426         return rc;
 427 }
 428
 429 static int tls_getsockopt(struct sock *sk, int level, int optname,
 430                           char __user *optval, int __user *optlen)
 431 {
 432         struct tls_context *ctx = tls_get_ctx(sk);
 433
 434         if (level != SOL_TLS)
 435                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 436
 437         return do_tls_getsockopt(sk, optname, optval, optlen);
 438 }
 439
 440 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 441                                   unsigned int optlen, int tx)
 442 {
 443         struct tls_crypto_info *crypto_info;
 444         struct tls_crypto_info *alt_crypto_info;
 445         struct tls_context *ctx = tls_get_ctx(sk);
 446         size_t optsize;
 447         int rc = 0;
 448         int conf;
 449
 450         if (!optval || (optlen < sizeof(*crypto_info))) {
 451                 rc = -EINVAL;
 452                 goto out;
 453         }
 454
 455         if (tx) {
 456                 crypto_info = &ctx->crypto_send.info;
 457                 alt_crypto_info = &ctx->crypto_recv.info;
 458         } else {
 459                 crypto_info = &ctx->crypto_recv.info;
 460                 alt_crypto_info = &ctx->crypto_send.info;
 461         }
 462
 463         /* Currently we don't support set crypto info more than one time */
 464         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 465                 rc = -EBUSY;
 466                 goto out;
 467         }
 468
 469         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 470         if (rc) {
 471                 rc = -EFAULT;
 472                 goto err_crypto_info;
 473         }
 474
 475         /* check version */
 476         if (crypto_info->version != TLS_1_2_VERSION &&
 477             crypto_info->version != TLS_1_3_VERSION) {
 478                 rc = -ENOTSUPP;
 479                 goto err_crypto_info;
 480         }
 481
 482         /* Ensure that TLS version and ciphers are same in both directions */
 483         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 484                 if (alt_crypto_info->version != crypto_info->version ||
 485                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 486                         rc = -EINVAL;
 487                         goto err_crypto_info;
 488                 }
 489         }
 490
 491         switch (crypto_info->cipher_type) {
 492         case TLS_CIPHER_AES_GCM_128:
 493                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 494                 break;
 495         case TLS_CIPHER_AES_GCM_256: {
 496                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 497                 break;
 498         }
 499         case TLS_CIPHER_AES_CCM_128:
 500                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 501                 break;
 502         default:
 503                 rc = -EINVAL;
 504                 goto err_crypto_info;
 505         }
 506
 507         if (optlen != optsize) {
 508                 rc = -EINVAL;
 509                 goto err_crypto_info;
 510         }
 511
 512         rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 513                             optlen - sizeof(*crypto_info));
 514         if (rc) {
 515                 rc = -EFAULT;
 516                 goto err_crypto_info;
 517         }
 518
 519         if (tx) {
 520 #ifdef CONFIG_TLS_DEVICE
 521                 rc = tls_set_device_offload(sk, ctx);
 522                 conf = TLS_HW;
 523                 if (rc) {
 524 #else
 525                 {
 526 #endif
 527                         rc = tls_set_sw_offload(sk, ctx, 1);
 528                         if (rc)
 529                                 goto err_crypto_info;
 530                         conf = TLS_SW;
 531                 }
 532         } else {
 533 #ifdef CONFIG_TLS_DEVICE
 534                 rc = tls_set_device_offload_rx(sk, ctx);
 535                 conf = TLS_HW;
 536                 if (rc) {
 537 #else
 538                 {
 539 #endif
 540                         rc = tls_set_sw_offload(sk, ctx, 0);
 541                         if (rc)
 542                                 goto err_crypto_info;
 543                         conf = TLS_SW;
 544                 }
 545                 tls_sw_strparser_arm(sk, ctx);
 546         }
 547
 548         if (tx)
 549                 ctx->tx_conf = conf;
 550         else
 551                 ctx->rx_conf = conf;
 552         update_sk_prot(sk, ctx);
 553         if (tx) {
 554                 ctx->sk_write_space = sk->sk_write_space;
 555                 sk->sk_write_space = tls_write_space;
 556         } else {
 557                 sk->sk_socket->ops = &tls_sw_proto_ops;
 558         }
 559         goto out;
 560
 561 err_crypto_info:
 562         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 563 out:
 564         return rc;
 565 }
 566
 567 static int do_tls_setsockopt(struct sock *sk, int optname,
 568                              char __user *optval, unsigned int optlen)
 569 {
 570         int rc = 0;
 571
 572         switch (optname) {
 573         case TLS_TX:
 574         case TLS_RX:
 575                 lock_sock(sk);
 576                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 577                                             optname == TLS_TX);
 578                 release_sock(sk);
 579                 break;
 580         default:
 581                 rc = -ENOPROTOOPT;
 582                 break;
 583         }
 584         return rc;
 585 }
 586
 587 static int tls_setsockopt(struct sock *sk, int level, int optname,
 588                           char __user *optval, unsigned int optlen)
 589 {
 590         struct tls_context *ctx = tls_get_ctx(sk);
 591
 592         if (level != SOL_TLS)
 593                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 594
 595         return do_tls_setsockopt(sk, optname, optval, optlen);
 596 }
 597
 598 static struct tls_context *create_ctx(struct sock *sk)
 599 {
 600         struct inet_connection_sock *icsk = inet_csk(sk);
 601         struct tls_context *ctx;
 602
 603         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 604         if (!ctx)
 605                 return NULL;
 606
 607         icsk->icsk_ulp_data = ctx;
 608         ctx->setsockopt = sk->sk_prot->setsockopt;
 609         ctx->getsockopt = sk->sk_prot->getsockopt;
 610         ctx->sk_proto_close = sk->sk_prot->close;
 611         return ctx;
 612 }
 613
 614 static void tls_build_proto(struct sock *sk)
 615 {
 616         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 617
 618         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 619         if (ip_ver == TLSV6 &&
 620             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 621                 mutex_lock(&tcpv6_prot_mutex);
 622                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 623                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 624                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 625                 }
 626                 mutex_unlock(&tcpv6_prot_mutex);
 627         }
 628
 629         if (ip_ver == TLSV4 &&
 630             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
 631                 mutex_lock(&tcpv4_prot_mutex);
 632                 if (likely(sk->sk_prot != saved_tcpv4_prot)) {
 633                         build_protos(tls_prots[TLSV4], sk->sk_prot);
 634                         smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
 635                 }
 636                 mutex_unlock(&tcpv4_prot_mutex);
 637         }
 638 }
 639
 640 static void tls_hw_sk_destruct(struct sock *sk)
 641 {
 642         struct tls_context *ctx = tls_get_ctx(sk);
 643         struct inet_connection_sock *icsk = inet_csk(sk);
 644
 645         ctx->sk_destruct(sk);
 646         /* Free ctx */
 647         tls_ctx_free(ctx);
 648         icsk->icsk_ulp_data = NULL;
 649 }
 650
 651 static int tls_hw_prot(struct sock *sk)
 652 {
 653         struct tls_context *ctx;
 654         struct tls_device *dev;
 655         int rc = 0;
 656
 657         spin_lock_bh(&device_spinlock);
 658         list_for_each_entry(dev, &device_list, dev_list) {
 659                 if (dev->feature && dev->feature(dev)) {
 660                         ctx = create_ctx(sk);
 661                         if (!ctx)
 662                                 goto out;
 663
 664                         spin_unlock_bh(&device_spinlock);
 665                         tls_build_proto(sk);
 666                         ctx->hash = sk->sk_prot->hash;
 667                         ctx->unhash = sk->sk_prot->unhash;
 668                         ctx->sk_proto_close = sk->sk_prot->close;
 669                         ctx->sk_destruct = sk->sk_destruct;
 670                         sk->sk_destruct = tls_hw_sk_destruct;
 671                         ctx->rx_conf = TLS_HW_RECORD;
 672                         ctx->tx_conf = TLS_HW_RECORD;
 673                         update_sk_prot(sk, ctx);
 674                         spin_lock_bh(&device_spinlock);
 675                         rc = 1;
 676                         break;
 677                 }
 678         }
 679 out:
 680         spin_unlock_bh(&device_spinlock);
 681         return rc;
 682 }
 683
 684 static void tls_hw_unhash(struct sock *sk)
 685 {
 686         struct tls_context *ctx = tls_get_ctx(sk);
 687         struct tls_device *dev;
 688
 689         spin_lock_bh(&device_spinlock);
 690         list_for_each_entry(dev, &device_list, dev_list) {
 691                 if (dev->unhash) {
 692                         kref_get(&dev->kref);
 693                         spin_unlock_bh(&device_spinlock);
 694                         dev->unhash(dev, sk);
 695                         kref_put(&dev->kref, dev->release);
 696                         spin_lock_bh(&device_spinlock);
 697                 }
 698         }
 699         spin_unlock_bh(&device_spinlock);
 700         ctx->unhash(sk);
 701 }
 702
 703 static int tls_hw_hash(struct sock *sk)
 704 {
 705         struct tls_context *ctx = tls_get_ctx(sk);
 706         struct tls_device *dev;
 707         int err;
 708
 709         err = ctx->hash(sk);
 710         spin_lock_bh(&device_spinlock);
 711         list_for_each_entry(dev, &device_list, dev_list) {
 712                 if (dev->hash) {
 713                         kref_get(&dev->kref);
 714                         spin_unlock_bh(&device_spinlock);
 715                         err |= dev->hash(dev, sk);
 716                         kref_put(&dev->kref, dev->release);
 717                         spin_lock_bh(&device_spinlock);
 718                 }
 719         }
 720         spin_unlock_bh(&device_spinlock);
 721
 722         if (err)
 723                 tls_hw_unhash(sk);
 724         return err;
 725 }
 726
 727 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 728                          struct proto *base)
 729 {
 730         prot[TLS_BASE][TLS_BASE] = *base;
 731         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 732         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 733         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 734
 735         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 736         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 737         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 738
 739         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 740         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 741         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 742         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 743
 744         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 745         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 746         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 747         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 748
 749 #ifdef CONFIG_TLS_DEVICE
 750         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 751         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 752         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 753
 754         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 755         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 756         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 757
 758         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 759
 760         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 761
 762         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 763 #endif
 764
 765         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 766         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 767         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 768 }
 769
 770 static int tls_init(struct sock *sk)
 771 {
 772         struct tls_context *ctx;
 773         int rc = 0;
 774
 775         if (tls_hw_prot(sk))
 776                 goto out;
 777
 778         /* The TLS ulp is currently supported only for TCP sockets
 779          * in ESTABLISHED state.
 780          * Supporting sockets in LISTEN state will require us
 781          * to modify the accept implementation to clone rather then
 782          * share the ulp context.
 783          */
 784         if (sk->sk_state != TCP_ESTABLISHED)
 785                 return -ENOTSUPP;
 786
 787         /* allocate tls context */
 788         ctx = create_ctx(sk);
 789         if (!ctx) {
 790                 rc = -ENOMEM;
 791                 goto out;
 792         }
 793
 794         tls_build_proto(sk);
 795         ctx->tx_conf = TLS_BASE;
 796         ctx->rx_conf = TLS_BASE;
 797         update_sk_prot(sk, ctx);
 798 out:
 799         return rc;
 800 }
 801
 802 void tls_register_device(struct tls_device *device)
 803 {
 804         spin_lock_bh(&device_spinlock);
 805         list_add_tail(&device->dev_list, &device_list);
 806         spin_unlock_bh(&device_spinlock);
 807 }
 808 EXPORT_SYMBOL(tls_register_device);
 809
 810 void tls_unregister_device(struct tls_device *device)
 811 {
 812         spin_lock_bh(&device_spinlock);
 813         list_del(&device->dev_list);
 814         spin_unlock_bh(&device_spinlock);
 815 }
 816 EXPORT_SYMBOL(tls_unregister_device);
 817
 818 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 819         .name                   = "tls",
 820         .owner                  = THIS_MODULE,
 821         .init                   = tls_init,
 822 };
 823
 824 static int __init tls_register(void)
 825 {
 826         tls_sw_proto_ops = inet_stream_ops;
 827         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 828
 829 #ifdef CONFIG_TLS_DEVICE
 830         tls_device_init();
 831 #endif
 832         tcp_register_ulp(&tcp_tls_ulp_ops);
 833
 834         return 0;
 835 }
 836
 837 static void __exit tls_unregister(void)
 838 {
 839         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 840 #ifdef CONFIG_TLS_DEVICE
 841         tls_device_cleanup();
 842 #endif
 843 }
 844
 845 module_init(tls_register);
 846 module_exit(tls_unregister);