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_close(struct sock *sk, long timeout)
 265 {
 266         struct tls_context *ctx = tls_get_ctx(sk);
 267         long timeo = sock_sndtimeo(sk, 0);
 268         void (*sk_proto_close)(struct sock *sk, long timeout);
 269         bool free_ctx = false;
 270
 271         lock_sock(sk);
 272         sk_proto_close = ctx->sk_proto_close;
 273
 274         if (ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD)
 275                 goto skip_tx_cleanup;
 276
 277         if (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE) {
 278                 free_ctx = true;
 279                 goto skip_tx_cleanup;
 280         }
 281
 282         if (unlikely(sk->sk_write_pending) &&
 283             !wait_on_pending_writer(sk, &timeo))
 284                 tls_handle_open_record(sk, 0);
 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 #ifdef CONFIG_TLS_DEVICE
 292         } else if (ctx->tx_conf == TLS_HW) {
 293                 tls_device_free_resources_tx(sk);
 294 #endif
 295         }
 296
 297         if (ctx->rx_conf == TLS_SW)
 298                 tls_sw_free_resources_rx(sk);
 299
 300 #ifdef CONFIG_TLS_DEVICE
 301         if (ctx->rx_conf == TLS_HW)
 302                 tls_device_offload_cleanup_rx(sk);
 303
 304         if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) {
 305 #else
 306         {
 307 #endif
 308                 tls_ctx_free(ctx);
 309                 ctx = NULL;
 310         }
 311
 312 skip_tx_cleanup:
 313         release_sock(sk);
 314         sk_proto_close(sk, timeout);
 315         /* free ctx for TLS_HW_RECORD, used by tcp_set_state
 316          * for sk->sk_prot->unhash [tls_hw_unhash]
 317          */
 318         if (free_ctx)
 319                 tls_ctx_free(ctx);
 320 }
 321
 322 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 323                                 int __user *optlen)
 324 {
 325         int rc = 0;
 326         struct tls_context *ctx = tls_get_ctx(sk);
 327         struct tls_crypto_info *crypto_info;
 328         int len;
 329
 330         if (get_user(len, optlen))
 331                 return -EFAULT;
 332
 333         if (!optval || (len < sizeof(*crypto_info))) {
 334                 rc = -EINVAL;
 335                 goto out;
 336         }
 337
 338         if (!ctx) {
 339                 rc = -EBUSY;
 340                 goto out;
 341         }
 342
 343         /* get user crypto info */
 344         crypto_info = &ctx->crypto_send.info;
 345
 346         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 347                 rc = -EBUSY;
 348                 goto out;
 349         }
 350
 351         if (len == sizeof(*crypto_info)) {
 352                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 353                         rc = -EFAULT;
 354                 goto out;
 355         }
 356
 357         switch (crypto_info->cipher_type) {
 358         case TLS_CIPHER_AES_GCM_128: {
 359                 struct tls12_crypto_info_aes_gcm_128 *
 360                   crypto_info_aes_gcm_128 =
 361                   container_of(crypto_info,
 362                                struct tls12_crypto_info_aes_gcm_128,
 363                                info);
 364
 365                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 366                         rc = -EINVAL;
 367                         goto out;
 368                 }
 369                 lock_sock(sk);
 370                 memcpy(crypto_info_aes_gcm_128->iv,
 371                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 372                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 373                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 374                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 375                 release_sock(sk);
 376                 if (copy_to_user(optval,
 377                                  crypto_info_aes_gcm_128,
 378                                  sizeof(*crypto_info_aes_gcm_128)))
 379                         rc = -EFAULT;
 380                 break;
 381         }
 382         case TLS_CIPHER_AES_GCM_256: {
 383                 struct tls12_crypto_info_aes_gcm_256 *
 384                   crypto_info_aes_gcm_256 =
 385                   container_of(crypto_info,
 386                                struct tls12_crypto_info_aes_gcm_256,
 387                                info);
 388
 389                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 390                         rc = -EINVAL;
 391                         goto out;
 392                 }
 393                 lock_sock(sk);
 394                 memcpy(crypto_info_aes_gcm_256->iv,
 395                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 396                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 397                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 398                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 399                 release_sock(sk);
 400                 if (copy_to_user(optval,
 401                                  crypto_info_aes_gcm_256,
 402                                  sizeof(*crypto_info_aes_gcm_256)))
 403                         rc = -EFAULT;
 404                 break;
 405         }
 406         default:
 407                 rc = -EINVAL;
 408         }
 409
 410 out:
 411         return rc;
 412 }
 413
 414 static int do_tls_getsockopt(struct sock *sk, int optname,
 415                              char __user *optval, int __user *optlen)
 416 {
 417         int rc = 0;
 418
 419         switch (optname) {
 420         case TLS_TX:
 421                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 422                 break;
 423         default:
 424                 rc = -ENOPROTOOPT;
 425                 break;
 426         }
 427         return rc;
 428 }
 429
 430 static int tls_getsockopt(struct sock *sk, int level, int optname,
 431                           char __user *optval, int __user *optlen)
 432 {
 433         struct tls_context *ctx = tls_get_ctx(sk);
 434
 435         if (level != SOL_TLS)
 436                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 437
 438         return do_tls_getsockopt(sk, optname, optval, optlen);
 439 }
 440
 441 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 442                                   unsigned int optlen, int tx)
 443 {
 444         struct tls_crypto_info *crypto_info;
 445         struct tls_crypto_info *alt_crypto_info;
 446         struct tls_context *ctx = tls_get_ctx(sk);
 447         size_t optsize;
 448         int rc = 0;
 449         int conf;
 450
 451         if (!optval || (optlen < sizeof(*crypto_info))) {
 452                 rc = -EINVAL;
 453                 goto out;
 454         }
 455
 456         if (tx) {
 457                 crypto_info = &ctx->crypto_send.info;
 458                 alt_crypto_info = &ctx->crypto_recv.info;
 459         } else {
 460                 crypto_info = &ctx->crypto_recv.info;
 461                 alt_crypto_info = &ctx->crypto_send.info;
 462         }
 463
 464         /* Currently we don't support set crypto info more than one time */
 465         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 466                 rc = -EBUSY;
 467                 goto out;
 468         }
 469
 470         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 471         if (rc) {
 472                 rc = -EFAULT;
 473                 goto err_crypto_info;
 474         }
 475
 476         /* check version */
 477         if (crypto_info->version != TLS_1_2_VERSION &&
 478             crypto_info->version != TLS_1_3_VERSION) {
 479                 rc = -ENOTSUPP;
 480                 goto err_crypto_info;
 481         }
 482
 483         /* Ensure that TLS version and ciphers are same in both directions */
 484         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 485                 if (alt_crypto_info->version != crypto_info->version ||
 486                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 487                         rc = -EINVAL;
 488                         goto err_crypto_info;
 489                 }
 490         }
 491
 492         switch (crypto_info->cipher_type) {
 493         case TLS_CIPHER_AES_GCM_128:
 494                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 495                 break;
 496         case TLS_CIPHER_AES_GCM_256: {
 497                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 498                 break;
 499         }
 500         case TLS_CIPHER_AES_CCM_128:
 501                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 502                 break;
 503         default:
 504                 rc = -EINVAL;
 505                 goto err_crypto_info;
 506         }
 507
 508         if (optlen != optsize) {
 509                 rc = -EINVAL;
 510                 goto err_crypto_info;
 511         }
 512
 513         rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 514                             optlen - sizeof(*crypto_info));
 515         if (rc) {
 516                 rc = -EFAULT;
 517                 goto err_crypto_info;
 518         }
 519
 520         if (tx) {
 521 #ifdef CONFIG_TLS_DEVICE
 522                 rc = tls_set_device_offload(sk, ctx);
 523                 conf = TLS_HW;
 524                 if (rc) {
 525 #else
 526                 {
 527 #endif
 528                         rc = tls_set_sw_offload(sk, ctx, 1);
 529                         conf = TLS_SW;
 530                 }
 531         } else {
 532 #ifdef CONFIG_TLS_DEVICE
 533                 rc = tls_set_device_offload_rx(sk, ctx);
 534                 conf = TLS_HW;
 535                 if (rc) {
 536 #else
 537                 {
 538 #endif
 539                         rc = tls_set_sw_offload(sk, ctx, 0);
 540                         conf = TLS_SW;
 541                 }
 542         }
 543
 544         if (rc)
 545                 goto err_crypto_info;
 546
 547         if (tx)
 548                 ctx->tx_conf = conf;
 549         else
 550                 ctx->rx_conf = conf;
 551         update_sk_prot(sk, ctx);
 552         if (tx) {
 553                 ctx->sk_write_space = sk->sk_write_space;
 554                 sk->sk_write_space = tls_write_space;
 555         } else {
 556                 sk->sk_socket->ops = &tls_sw_proto_ops;
 557         }
 558         goto out;
 559
 560 err_crypto_info:
 561         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 562 out:
 563         return rc;
 564 }
 565
 566 static int do_tls_setsockopt(struct sock *sk, int optname,
 567                              char __user *optval, unsigned int optlen)
 568 {
 569         int rc = 0;
 570
 571         switch (optname) {
 572         case TLS_TX:
 573         case TLS_RX:
 574                 lock_sock(sk);
 575                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 576                                             optname == TLS_TX);
 577                 release_sock(sk);
 578                 break;
 579         default:
 580                 rc = -ENOPROTOOPT;
 581                 break;
 582         }
 583         return rc;
 584 }
 585
 586 static int tls_setsockopt(struct sock *sk, int level, int optname,
 587                           char __user *optval, unsigned int optlen)
 588 {
 589         struct tls_context *ctx = tls_get_ctx(sk);
 590
 591         if (level != SOL_TLS)
 592                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 593
 594         return do_tls_setsockopt(sk, optname, optval, optlen);
 595 }
 596
 597 static struct tls_context *create_ctx(struct sock *sk)
 598 {
 599         struct inet_connection_sock *icsk = inet_csk(sk);
 600         struct tls_context *ctx;
 601
 602         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 603         if (!ctx)
 604                 return NULL;
 605
 606         icsk->icsk_ulp_data = ctx;
 607         ctx->setsockopt = sk->sk_prot->setsockopt;
 608         ctx->getsockopt = sk->sk_prot->getsockopt;
 609         ctx->sk_proto_close = sk->sk_prot->close;
 610         return ctx;
 611 }
 612
 613 static void tls_build_proto(struct sock *sk)
 614 {
 615         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 616
 617         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 618         if (ip_ver == TLSV6 &&
 619             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 620                 mutex_lock(&tcpv6_prot_mutex);
 621                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 622                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 623                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 624                 }
 625                 mutex_unlock(&tcpv6_prot_mutex);
 626         }
 627
 628         if (ip_ver == TLSV4 &&
 629             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
 630                 mutex_lock(&tcpv4_prot_mutex);
 631                 if (likely(sk->sk_prot != saved_tcpv4_prot)) {
 632                         build_protos(tls_prots[TLSV4], sk->sk_prot);
 633                         smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
 634                 }
 635                 mutex_unlock(&tcpv4_prot_mutex);
 636         }
 637 }
 638
 639 static void tls_hw_sk_destruct(struct sock *sk)
 640 {
 641         struct tls_context *ctx = tls_get_ctx(sk);
 642         struct inet_connection_sock *icsk = inet_csk(sk);
 643
 644         ctx->sk_destruct(sk);
 645         /* Free ctx */
 646         tls_ctx_free(ctx);
 647         icsk->icsk_ulp_data = NULL;
 648 }
 649
 650 static int tls_hw_prot(struct sock *sk)
 651 {
 652         struct tls_context *ctx;
 653         struct tls_device *dev;
 654         int rc = 0;
 655
 656         spin_lock_bh(&device_spinlock);
 657         list_for_each_entry(dev, &device_list, dev_list) {
 658                 if (dev->feature && dev->feature(dev)) {
 659                         ctx = create_ctx(sk);
 660                         if (!ctx)
 661                                 goto out;
 662
 663                         spin_unlock_bh(&device_spinlock);
 664                         tls_build_proto(sk);
 665                         ctx->hash = sk->sk_prot->hash;
 666                         ctx->unhash = sk->sk_prot->unhash;
 667                         ctx->sk_proto_close = sk->sk_prot->close;
 668                         ctx->sk_destruct = sk->sk_destruct;
 669                         sk->sk_destruct = tls_hw_sk_destruct;
 670                         ctx->rx_conf = TLS_HW_RECORD;
 671                         ctx->tx_conf = TLS_HW_RECORD;
 672                         update_sk_prot(sk, ctx);
 673                         spin_lock_bh(&device_spinlock);
 674                         rc = 1;
 675                         break;
 676                 }
 677         }
 678 out:
 679         spin_unlock_bh(&device_spinlock);
 680         return rc;
 681 }
 682
 683 static void tls_hw_unhash(struct sock *sk)
 684 {
 685         struct tls_context *ctx = tls_get_ctx(sk);
 686         struct tls_device *dev;
 687
 688         spin_lock_bh(&device_spinlock);
 689         list_for_each_entry(dev, &device_list, dev_list) {
 690                 if (dev->unhash) {
 691                         kref_get(&dev->kref);
 692                         spin_unlock_bh(&device_spinlock);
 693                         dev->unhash(dev, sk);
 694                         kref_put(&dev->kref, dev->release);
 695                         spin_lock_bh(&device_spinlock);
 696                 }
 697         }
 698         spin_unlock_bh(&device_spinlock);
 699         ctx->unhash(sk);
 700 }
 701
 702 static int tls_hw_hash(struct sock *sk)
 703 {
 704         struct tls_context *ctx = tls_get_ctx(sk);
 705         struct tls_device *dev;
 706         int err;
 707
 708         err = ctx->hash(sk);
 709         spin_lock_bh(&device_spinlock);
 710         list_for_each_entry(dev, &device_list, dev_list) {
 711                 if (dev->hash) {
 712                         kref_get(&dev->kref);
 713                         spin_unlock_bh(&device_spinlock);
 714                         err |= dev->hash(dev, sk);
 715                         kref_put(&dev->kref, dev->release);
 716                         spin_lock_bh(&device_spinlock);
 717                 }
 718         }
 719         spin_unlock_bh(&device_spinlock);
 720
 721         if (err)
 722                 tls_hw_unhash(sk);
 723         return err;
 724 }
 725
 726 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 727                          struct proto *base)
 728 {
 729         prot[TLS_BASE][TLS_BASE] = *base;
 730         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 731         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 732         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 733
 734         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 735         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 736         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 737
 738         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 739         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 740         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 741         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 742
 743         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 744         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 745         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 746         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 747
 748 #ifdef CONFIG_TLS_DEVICE
 749         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 750         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 751         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 752
 753         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 754         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 755         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 756
 757         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 758
 759         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 760
 761         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 762 #endif
 763
 764         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 765         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 766         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 767         prot[TLS_HW_RECORD][TLS_HW_RECORD].close        = tls_sk_proto_close;
 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);