net/tls/tls_main.c

   1 /*
   2  * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2016-2017, Dave Watson <[email protected]>. 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         ctx->sk_write_space(sk);
 150
 151         return 0;
 152 }
 153
 154 static int tls_handle_open_record(struct sock *sk, int flags)
 155 {
 156         struct tls_context *ctx = tls_get_ctx(sk);
 157
 158         if (tls_is_pending_open_record(ctx))
 159                 return ctx->push_pending_record(sk, flags);
 160
 161         return 0;
 162 }
 163
 164 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 165                       unsigned char *record_type)
 166 {
 167         struct cmsghdr *cmsg;
 168         int rc = -EINVAL;
 169
 170         for_each_cmsghdr(cmsg, msg) {
 171                 if (!CMSG_OK(msg, cmsg))
 172                         return -EINVAL;
 173                 if (cmsg->cmsg_level != SOL_TLS)
 174                         continue;
 175
 176                 switch (cmsg->cmsg_type) {
 177                 case TLS_SET_RECORD_TYPE:
 178                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 179                                 return -EINVAL;
 180
 181                         if (msg->msg_flags & MSG_MORE)
 182                                 return -EINVAL;
 183
 184                         rc = tls_handle_open_record(sk, msg->msg_flags);
 185                         if (rc)
 186                                 return rc;
 187
 188                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 189                         rc = 0;
 190                         break;
 191                 default:
 192                         return -EINVAL;
 193                 }
 194         }
 195
 196         return rc;
 197 }
 198
 199 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 200                             int flags)
 201 {
 202         struct scatterlist *sg;
 203         u16 offset;
 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 int tls_push_pending_closed_record(struct sock *sk,
 213                                    struct tls_context *tls_ctx,
 214                                    int flags, long *timeo)
 215 {
 216         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 217
 218         if (tls_is_partially_sent_record(tls_ctx) ||
 219             !list_empty(&ctx->tx_list))
 220                 return tls_tx_records(sk, flags);
 221         else
 222                 return tls_ctx->push_pending_record(sk, flags);
 223 }
 224
 225 static void tls_write_space(struct sock *sk)
 226 {
 227         struct tls_context *ctx = tls_get_ctx(sk);
 228         struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx);
 229
 230         /* If in_tcp_sendpages call lower protocol write space handler
 231          * to ensure we wake up any waiting operations there. For example
 232          * if do_tcp_sendpages where to call sk_wait_event.
 233          */
 234         if (ctx->in_tcp_sendpages) {
 235                 ctx->sk_write_space(sk);
 236                 return;
 237         }
 238
 239         /* Schedule the transmission if tx list is ready */
 240         if (is_tx_ready(tx_ctx) && !sk->sk_write_pending) {
 241                 /* Schedule the transmission */
 242                 if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))
 243                         schedule_delayed_work(&tx_ctx->tx_work.work, 0);
 244         }
 245
 246         ctx->sk_write_space(sk);
 247 }
 248
 249 static void tls_ctx_free(struct tls_context *ctx)
 250 {
 251         if (!ctx)
 252                 return;
 253
 254         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 255         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 256         kfree(ctx);
 257 }
 258
 259 static void tls_sk_proto_close(struct sock *sk, long timeout)
 260 {
 261         struct tls_context *ctx = tls_get_ctx(sk);
 262         long timeo = sock_sndtimeo(sk, 0);
 263         void (*sk_proto_close)(struct sock *sk, long timeout);
 264         bool free_ctx = false;
 265
 266         lock_sock(sk);
 267         sk_proto_close = ctx->sk_proto_close;
 268
 269         if (ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD)
 270                 goto skip_tx_cleanup;
 271
 272         if (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE) {
 273                 free_ctx = true;
 274                 goto skip_tx_cleanup;
 275         }
 276
 277         if (!tls_complete_pending_work(sk, ctx, 0, &timeo))
 278                 tls_handle_open_record(sk, 0);
 279
 280         /* We need these for tls_sw_fallback handling of other packets */
 281         if (ctx->tx_conf == TLS_SW) {
 282                 kfree(ctx->tx.rec_seq);
 283                 kfree(ctx->tx.iv);
 284                 tls_sw_free_resources_tx(sk);
 285         }
 286
 287         if (ctx->rx_conf == TLS_SW) {
 288                 kfree(ctx->rx.rec_seq);
 289                 kfree(ctx->rx.iv);
 290                 tls_sw_free_resources_rx(sk);
 291         }
 292
 293 #ifdef CONFIG_TLS_DEVICE
 294         if (ctx->rx_conf == TLS_HW)
 295                 tls_device_offload_cleanup_rx(sk);
 296
 297         if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) {
 298 #else
 299         {
 300 #endif
 301                 tls_ctx_free(ctx);
 302                 ctx = NULL;
 303         }
 304
 305 skip_tx_cleanup:
 306         release_sock(sk);
 307         sk_proto_close(sk, timeout);
 308         /* free ctx for TLS_HW_RECORD, used by tcp_set_state
 309          * for sk->sk_prot->unhash [tls_hw_unhash]
 310          */
 311         if (free_ctx)
 312                 tls_ctx_free(ctx);
 313 }
 314
 315 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 316                                 int __user *optlen)
 317 {
 318         int rc = 0;
 319         struct tls_context *ctx = tls_get_ctx(sk);
 320         struct tls_crypto_info *crypto_info;
 321         int len;
 322
 323         if (get_user(len, optlen))
 324                 return -EFAULT;
 325
 326         if (!optval || (len < sizeof(*crypto_info))) {
 327                 rc = -EINVAL;
 328                 goto out;
 329         }
 330
 331         if (!ctx) {
 332                 rc = -EBUSY;
 333                 goto out;
 334         }
 335
 336         /* get user crypto info */
 337         crypto_info = &ctx->crypto_send.info;
 338
 339         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 340                 rc = -EBUSY;
 341                 goto out;
 342         }
 343
 344         if (len == sizeof(*crypto_info)) {
 345                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 346                         rc = -EFAULT;
 347                 goto out;
 348         }
 349
 350         switch (crypto_info->cipher_type) {
 351         case TLS_CIPHER_AES_GCM_128: {
 352                 struct tls12_crypto_info_aes_gcm_128 *
 353                   crypto_info_aes_gcm_128 =
 354                   container_of(crypto_info,
 355                                struct tls12_crypto_info_aes_gcm_128,
 356                                info);
 357
 358                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 359                         rc = -EINVAL;
 360                         goto out;
 361                 }
 362                 lock_sock(sk);
 363                 memcpy(crypto_info_aes_gcm_128->iv,
 364                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 365                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 366                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 367                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 368                 release_sock(sk);
 369                 if (copy_to_user(optval,
 370                                  crypto_info_aes_gcm_128,
 371                                  sizeof(*crypto_info_aes_gcm_128)))
 372                         rc = -EFAULT;
 373                 break;
 374         }
 375         case TLS_CIPHER_AES_GCM_256: {
 376                 struct tls12_crypto_info_aes_gcm_256 *
 377                   crypto_info_aes_gcm_256 =
 378                   container_of(crypto_info,
 379                                struct tls12_crypto_info_aes_gcm_256,
 380                                info);
 381
 382                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 383                         rc = -EINVAL;
 384                         goto out;
 385                 }
 386                 lock_sock(sk);
 387                 memcpy(crypto_info_aes_gcm_256->iv,
 388                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 389                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 390                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 391                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 392                 release_sock(sk);
 393                 if (copy_to_user(optval,
 394                                  crypto_info_aes_gcm_256,
 395                                  sizeof(*crypto_info_aes_gcm_256)))
 396                         rc = -EFAULT;
 397                 break;
 398         }
 399         default:
 400                 rc = -EINVAL;
 401         }
 402
 403 out:
 404         return rc;
 405 }
 406
 407 static int do_tls_getsockopt(struct sock *sk, int optname,
 408                              char __user *optval, int __user *optlen)
 409 {
 410         int rc = 0;
 411
 412         switch (optname) {
 413         case TLS_TX:
 414                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 415                 break;
 416         default:
 417                 rc = -ENOPROTOOPT;
 418                 break;
 419         }
 420         return rc;
 421 }
 422
 423 static int tls_getsockopt(struct sock *sk, int level, int optname,
 424                           char __user *optval, int __user *optlen)
 425 {
 426         struct tls_context *ctx = tls_get_ctx(sk);
 427
 428         if (level != SOL_TLS)
 429                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 430
 431         return do_tls_getsockopt(sk, optname, optval, optlen);
 432 }
 433
 434 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 435                                   unsigned int optlen, int tx)
 436 {
 437         struct tls_crypto_info *crypto_info;
 438         struct tls_context *ctx = tls_get_ctx(sk);
 439         size_t optsize;
 440         int rc = 0;
 441         int conf;
 442
 443         if (!optval || (optlen < sizeof(*crypto_info))) {
 444                 rc = -EINVAL;
 445                 goto out;
 446         }
 447
 448         if (tx)
 449                 crypto_info = &ctx->crypto_send.info;
 450         else
 451                 crypto_info = &ctx->crypto_recv.info;
 452
 453         /* Currently we don't support set crypto info more than one time */
 454         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 455                 rc = -EBUSY;
 456                 goto out;
 457         }
 458
 459         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 460         if (rc) {
 461                 rc = -EFAULT;
 462                 goto err_crypto_info;
 463         }
 464
 465         /* check version */
 466         if (crypto_info->version != TLS_1_2_VERSION &&
 467             crypto_info->version != TLS_1_3_VERSION) {
 468                 rc = -ENOTSUPP;
 469                 goto err_crypto_info;
 470         }
 471
 472         switch (crypto_info->cipher_type) {
 473         case TLS_CIPHER_AES_GCM_128:
 474         case TLS_CIPHER_AES_GCM_256: {
 475                 optsize = crypto_info->cipher_type == TLS_CIPHER_AES_GCM_128 ?
 476                         sizeof(struct tls12_crypto_info_aes_gcm_128) :
 477                         sizeof(struct tls12_crypto_info_aes_gcm_256);
 478                 if (optlen != optsize) {
 479                         rc = -EINVAL;
 480                         goto err_crypto_info;
 481                 }
 482                 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 483                                     optlen - sizeof(*crypto_info));
 484                 if (rc) {
 485                         rc = -EFAULT;
 486                         goto err_crypto_info;
 487                 }
 488                 break;
 489         }
 490         default:
 491                 rc = -EINVAL;
 492                 goto err_crypto_info;
 493         }
 494
 495         if (tx) {
 496 #ifdef CONFIG_TLS_DEVICE
 497                 rc = tls_set_device_offload(sk, ctx);
 498                 conf = TLS_HW;
 499                 if (rc) {
 500 #else
 501                 {
 502 #endif
 503                         rc = tls_set_sw_offload(sk, ctx, 1);
 504                         conf = TLS_SW;
 505                 }
 506         } else {
 507 #ifdef CONFIG_TLS_DEVICE
 508                 rc = tls_set_device_offload_rx(sk, ctx);
 509                 conf = TLS_HW;
 510                 if (rc) {
 511 #else
 512                 {
 513 #endif
 514                         rc = tls_set_sw_offload(sk, ctx, 0);
 515                         conf = TLS_SW;
 516                 }
 517         }
 518
 519         if (rc)
 520                 goto err_crypto_info;
 521
 522         if (tx)
 523                 ctx->tx_conf = conf;
 524         else
 525                 ctx->rx_conf = conf;
 526         update_sk_prot(sk, ctx);
 527         if (tx) {
 528                 ctx->sk_write_space = sk->sk_write_space;
 529                 sk->sk_write_space = tls_write_space;
 530         } else {
 531                 sk->sk_socket->ops = &tls_sw_proto_ops;
 532         }
 533         goto out;
 534
 535 err_crypto_info:
 536         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 537 out:
 538         return rc;
 539 }
 540
 541 static int do_tls_setsockopt(struct sock *sk, int optname,
 542                              char __user *optval, unsigned int optlen)
 543 {
 544         int rc = 0;
 545
 546         switch (optname) {
 547         case TLS_TX:
 548         case TLS_RX:
 549                 lock_sock(sk);
 550                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 551                                             optname == TLS_TX);
 552                 release_sock(sk);
 553                 break;
 554         default:
 555                 rc = -ENOPROTOOPT;
 556                 break;
 557         }
 558         return rc;
 559 }
 560
 561 static int tls_setsockopt(struct sock *sk, int level, int optname,
 562                           char __user *optval, unsigned int optlen)
 563 {
 564         struct tls_context *ctx = tls_get_ctx(sk);
 565
 566         if (level != SOL_TLS)
 567                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 568
 569         return do_tls_setsockopt(sk, optname, optval, optlen);
 570 }
 571
 572 static struct tls_context *create_ctx(struct sock *sk)
 573 {
 574         struct inet_connection_sock *icsk = inet_csk(sk);
 575         struct tls_context *ctx;
 576
 577         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 578         if (!ctx)
 579                 return NULL;
 580
 581         icsk->icsk_ulp_data = ctx;
 582         ctx->setsockopt = sk->sk_prot->setsockopt;
 583         ctx->getsockopt = sk->sk_prot->getsockopt;
 584         ctx->sk_proto_close = sk->sk_prot->close;
 585         return ctx;
 586 }
 587
 588 static void tls_build_proto(struct sock *sk)
 589 {
 590         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 591
 592         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 593         if (ip_ver == TLSV6 &&
 594             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 595                 mutex_lock(&tcpv6_prot_mutex);
 596                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 597                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 598                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 599                 }
 600                 mutex_unlock(&tcpv6_prot_mutex);
 601         }
 602
 603         if (ip_ver == TLSV4 &&
 604             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
 605                 mutex_lock(&tcpv4_prot_mutex);
 606                 if (likely(sk->sk_prot != saved_tcpv4_prot)) {
 607                         build_protos(tls_prots[TLSV4], sk->sk_prot);
 608                         smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
 609                 }
 610                 mutex_unlock(&tcpv4_prot_mutex);
 611         }
 612 }
 613
 614 static void tls_hw_sk_destruct(struct sock *sk)
 615 {
 616         struct tls_context *ctx = tls_get_ctx(sk);
 617         struct inet_connection_sock *icsk = inet_csk(sk);
 618
 619         ctx->sk_destruct(sk);
 620         /* Free ctx */
 621         kfree(ctx);
 622         icsk->icsk_ulp_data = NULL;
 623 }
 624
 625 static int tls_hw_prot(struct sock *sk)
 626 {
 627         struct tls_context *ctx;
 628         struct tls_device *dev;
 629         int rc = 0;
 630
 631         spin_lock_bh(&device_spinlock);
 632         list_for_each_entry(dev, &device_list, dev_list) {
 633                 if (dev->feature && dev->feature(dev)) {
 634                         ctx = create_ctx(sk);
 635                         if (!ctx)
 636                                 goto out;
 637
 638                         spin_unlock_bh(&device_spinlock);
 639                         tls_build_proto(sk);
 640                         ctx->hash = sk->sk_prot->hash;
 641                         ctx->unhash = sk->sk_prot->unhash;
 642                         ctx->sk_proto_close = sk->sk_prot->close;
 643                         ctx->sk_destruct = sk->sk_destruct;
 644                         sk->sk_destruct = tls_hw_sk_destruct;
 645                         ctx->rx_conf = TLS_HW_RECORD;
 646                         ctx->tx_conf = TLS_HW_RECORD;
 647                         update_sk_prot(sk, ctx);
 648                         spin_lock_bh(&device_spinlock);
 649                         rc = 1;
 650                         break;
 651                 }
 652         }
 653 out:
 654         spin_unlock_bh(&device_spinlock);
 655         return rc;
 656 }
 657
 658 static void tls_hw_unhash(struct sock *sk)
 659 {
 660         struct tls_context *ctx = tls_get_ctx(sk);
 661         struct tls_device *dev;
 662
 663         spin_lock_bh(&device_spinlock);
 664         list_for_each_entry(dev, &device_list, dev_list) {
 665                 if (dev->unhash) {
 666                         kref_get(&dev->kref);
 667                         spin_unlock_bh(&device_spinlock);
 668                         dev->unhash(dev, sk);
 669                         kref_put(&dev->kref, dev->release);
 670                         spin_lock_bh(&device_spinlock);
 671                 }
 672         }
 673         spin_unlock_bh(&device_spinlock);
 674         ctx->unhash(sk);
 675 }
 676
 677 static int tls_hw_hash(struct sock *sk)
 678 {
 679         struct tls_context *ctx = tls_get_ctx(sk);
 680         struct tls_device *dev;
 681         int err;
 682
 683         err = ctx->hash(sk);
 684         spin_lock_bh(&device_spinlock);
 685         list_for_each_entry(dev, &device_list, dev_list) {
 686                 if (dev->hash) {
 687                         kref_get(&dev->kref);
 688                         spin_unlock_bh(&device_spinlock);
 689                         err |= dev->hash(dev, sk);
 690                         kref_put(&dev->kref, dev->release);
 691                         spin_lock_bh(&device_spinlock);
 692                 }
 693         }
 694         spin_unlock_bh(&device_spinlock);
 695
 696         if (err)
 697                 tls_hw_unhash(sk);
 698         return err;
 699 }
 700
 701 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 702                          struct proto *base)
 703 {
 704         prot[TLS_BASE][TLS_BASE] = *base;
 705         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 706         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 707         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 708
 709         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 710         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 711         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 712
 713         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 714         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 715         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 716         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 717
 718         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 719         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 720         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 721         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 722
 723 #ifdef CONFIG_TLS_DEVICE
 724         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 725         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 726         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 727
 728         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 729         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 730         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 731
 732         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 733
 734         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 735
 736         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 737 #endif
 738
 739         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 740         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 741         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 742         prot[TLS_HW_RECORD][TLS_HW_RECORD].close        = tls_sk_proto_close;
 743 }
 744
 745 static int tls_init(struct sock *sk)
 746 {
 747         struct tls_context *ctx;
 748         int rc = 0;
 749
 750         if (tls_hw_prot(sk))
 751                 goto out;
 752
 753         /* The TLS ulp is currently supported only for TCP sockets
 754          * in ESTABLISHED state.
 755          * Supporting sockets in LISTEN state will require us
 756          * to modify the accept implementation to clone rather then
 757          * share the ulp context.
 758          */
 759         if (sk->sk_state != TCP_ESTABLISHED)
 760                 return -ENOTSUPP;
 761
 762         /* allocate tls context */
 763         ctx = create_ctx(sk);
 764         if (!ctx) {
 765                 rc = -ENOMEM;
 766                 goto out;
 767         }
 768
 769         tls_build_proto(sk);
 770         ctx->tx_conf = TLS_BASE;
 771         ctx->rx_conf = TLS_BASE;
 772         update_sk_prot(sk, ctx);
 773 out:
 774         return rc;
 775 }
 776
 777 void tls_register_device(struct tls_device *device)
 778 {
 779         spin_lock_bh(&device_spinlock);
 780         list_add_tail(&device->dev_list, &device_list);
 781         spin_unlock_bh(&device_spinlock);
 782 }
 783 EXPORT_SYMBOL(tls_register_device);
 784
 785 void tls_unregister_device(struct tls_device *device)
 786 {
 787         spin_lock_bh(&device_spinlock);
 788         list_del(&device->dev_list);
 789         spin_unlock_bh(&device_spinlock);
 790 }
 791 EXPORT_SYMBOL(tls_unregister_device);
 792
 793 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 794         .name                   = "tls",
 795         .owner                  = THIS_MODULE,
 796         .init                   = tls_init,
 797 };
 798
 799 static int __init tls_register(void)
 800 {
 801         tls_sw_proto_ops = inet_stream_ops;
 802         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 803
 804 #ifdef CONFIG_TLS_DEVICE
 805         tls_device_init();
 806 #endif
 807         tcp_register_ulp(&tcp_tls_ulp_ops);
 808
 809         return 0;
 810 }
 811
 812 static void __exit tls_unregister(void)
 813 {
 814         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 815 #ifdef CONFIG_TLS_DEVICE
 816         tls_device_cleanup();
 817 #endif
 818 }
 819
 820 module_init(tls_register);
 821 module_exit(tls_unregister);