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 static void tls_write_space(struct sock *sk)
 212 {
 213         struct tls_context *ctx = tls_get_ctx(sk);
 214
 215         /* If in_tcp_sendpages call lower protocol write space handler
 216          * to ensure we wake up any waiting operations there. For example
 217          * if do_tcp_sendpages where to call sk_wait_event.
 218          */
 219         if (ctx->in_tcp_sendpages) {
 220                 ctx->sk_write_space(sk);
 221                 return;
 222         }
 223
 224 #ifdef CONFIG_TLS_DEVICE
 225         if (ctx->tx_conf == TLS_HW)
 226                 tls_device_write_space(sk, ctx);
 227         else
 228 #endif
 229                 tls_sw_write_space(sk, ctx);
 230
 231         ctx->sk_write_space(sk);
 232 }
 233
 234 static void tls_ctx_free(struct tls_context *ctx)
 235 {
 236         if (!ctx)
 237                 return;
 238
 239         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 240         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 241         kfree(ctx);
 242 }
 243
 244 static void tls_sk_proto_close(struct sock *sk, long timeout)
 245 {
 246         struct tls_context *ctx = tls_get_ctx(sk);
 247         long timeo = sock_sndtimeo(sk, 0);
 248         void (*sk_proto_close)(struct sock *sk, long timeout);
 249         bool free_ctx = false;
 250
 251         lock_sock(sk);
 252         sk_proto_close = ctx->sk_proto_close;
 253
 254         if (ctx->tx_conf == TLS_HW_RECORD && ctx->rx_conf == TLS_HW_RECORD)
 255                 goto skip_tx_cleanup;
 256
 257         if (ctx->tx_conf == TLS_BASE && ctx->rx_conf == TLS_BASE) {
 258                 free_ctx = true;
 259                 goto skip_tx_cleanup;
 260         }
 261
 262         if (!tls_complete_pending_work(sk, ctx, 0, &timeo))
 263                 tls_handle_open_record(sk, 0);
 264
 265         /* We need these for tls_sw_fallback handling of other packets */
 266         if (ctx->tx_conf == TLS_SW) {
 267                 kfree(ctx->tx.rec_seq);
 268                 kfree(ctx->tx.iv);
 269                 tls_sw_free_resources_tx(sk);
 270         }
 271
 272         if (ctx->rx_conf == TLS_SW) {
 273                 kfree(ctx->rx.rec_seq);
 274                 kfree(ctx->rx.iv);
 275                 tls_sw_free_resources_rx(sk);
 276         }
 277
 278 #ifdef CONFIG_TLS_DEVICE
 279         if (ctx->rx_conf == TLS_HW)
 280                 tls_device_offload_cleanup_rx(sk);
 281
 282         if (ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW) {
 283 #else
 284         {
 285 #endif
 286                 tls_ctx_free(ctx);
 287                 ctx = NULL;
 288         }
 289
 290 skip_tx_cleanup:
 291         release_sock(sk);
 292         sk_proto_close(sk, timeout);
 293         /* free ctx for TLS_HW_RECORD, used by tcp_set_state
 294          * for sk->sk_prot->unhash [tls_hw_unhash]
 295          */
 296         if (free_ctx)
 297                 tls_ctx_free(ctx);
 298 }
 299
 300 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 301                                 int __user *optlen)
 302 {
 303         int rc = 0;
 304         struct tls_context *ctx = tls_get_ctx(sk);
 305         struct tls_crypto_info *crypto_info;
 306         int len;
 307
 308         if (get_user(len, optlen))
 309                 return -EFAULT;
 310
 311         if (!optval || (len < sizeof(*crypto_info))) {
 312                 rc = -EINVAL;
 313                 goto out;
 314         }
 315
 316         if (!ctx) {
 317                 rc = -EBUSY;
 318                 goto out;
 319         }
 320
 321         /* get user crypto info */
 322         crypto_info = &ctx->crypto_send.info;
 323
 324         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 325                 rc = -EBUSY;
 326                 goto out;
 327         }
 328
 329         if (len == sizeof(*crypto_info)) {
 330                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 331                         rc = -EFAULT;
 332                 goto out;
 333         }
 334
 335         switch (crypto_info->cipher_type) {
 336         case TLS_CIPHER_AES_GCM_128: {
 337                 struct tls12_crypto_info_aes_gcm_128 *
 338                   crypto_info_aes_gcm_128 =
 339                   container_of(crypto_info,
 340                                struct tls12_crypto_info_aes_gcm_128,
 341                                info);
 342
 343                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 344                         rc = -EINVAL;
 345                         goto out;
 346                 }
 347                 lock_sock(sk);
 348                 memcpy(crypto_info_aes_gcm_128->iv,
 349                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 350                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 351                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 352                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 353                 release_sock(sk);
 354                 if (copy_to_user(optval,
 355                                  crypto_info_aes_gcm_128,
 356                                  sizeof(*crypto_info_aes_gcm_128)))
 357                         rc = -EFAULT;
 358                 break;
 359         }
 360         case TLS_CIPHER_AES_GCM_256: {
 361                 struct tls12_crypto_info_aes_gcm_256 *
 362                   crypto_info_aes_gcm_256 =
 363                   container_of(crypto_info,
 364                                struct tls12_crypto_info_aes_gcm_256,
 365                                info);
 366
 367                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 368                         rc = -EINVAL;
 369                         goto out;
 370                 }
 371                 lock_sock(sk);
 372                 memcpy(crypto_info_aes_gcm_256->iv,
 373                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 374                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 375                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 376                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 377                 release_sock(sk);
 378                 if (copy_to_user(optval,
 379                                  crypto_info_aes_gcm_256,
 380                                  sizeof(*crypto_info_aes_gcm_256)))
 381                         rc = -EFAULT;
 382                 break;
 383         }
 384         default:
 385                 rc = -EINVAL;
 386         }
 387
 388 out:
 389         return rc;
 390 }
 391
 392 static int do_tls_getsockopt(struct sock *sk, int optname,
 393                              char __user *optval, int __user *optlen)
 394 {
 395         int rc = 0;
 396
 397         switch (optname) {
 398         case TLS_TX:
 399                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 400                 break;
 401         default:
 402                 rc = -ENOPROTOOPT;
 403                 break;
 404         }
 405         return rc;
 406 }
 407
 408 static int tls_getsockopt(struct sock *sk, int level, int optname,
 409                           char __user *optval, int __user *optlen)
 410 {
 411         struct tls_context *ctx = tls_get_ctx(sk);
 412
 413         if (level != SOL_TLS)
 414                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 415
 416         return do_tls_getsockopt(sk, optname, optval, optlen);
 417 }
 418
 419 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 420                                   unsigned int optlen, int tx)
 421 {
 422         struct tls_crypto_info *crypto_info;
 423         struct tls_crypto_info *alt_crypto_info;
 424         struct tls_context *ctx = tls_get_ctx(sk);
 425         size_t optsize;
 426         int rc = 0;
 427         int conf;
 428
 429         if (!optval || (optlen < sizeof(*crypto_info))) {
 430                 rc = -EINVAL;
 431                 goto out;
 432         }
 433
 434         if (tx) {
 435                 crypto_info = &ctx->crypto_send.info;
 436                 alt_crypto_info = &ctx->crypto_recv.info;
 437         } else {
 438                 crypto_info = &ctx->crypto_recv.info;
 439                 alt_crypto_info = &ctx->crypto_send.info;
 440         }
 441
 442         /* Currently we don't support set crypto info more than one time */
 443         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 444                 rc = -EBUSY;
 445                 goto out;
 446         }
 447
 448         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 449         if (rc) {
 450                 rc = -EFAULT;
 451                 goto err_crypto_info;
 452         }
 453
 454         /* check version */
 455         if (crypto_info->version != TLS_1_2_VERSION &&
 456             crypto_info->version != TLS_1_3_VERSION) {
 457                 rc = -ENOTSUPP;
 458                 goto err_crypto_info;
 459         }
 460
 461         /* Ensure that TLS version and ciphers are same in both directions */
 462         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 463                 if (alt_crypto_info->version != crypto_info->version ||
 464                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 465                         rc = -EINVAL;
 466                         goto err_crypto_info;
 467                 }
 468         }
 469
 470         switch (crypto_info->cipher_type) {
 471         case TLS_CIPHER_AES_GCM_128:
 472         case TLS_CIPHER_AES_GCM_256: {
 473                 optsize = crypto_info->cipher_type == TLS_CIPHER_AES_GCM_128 ?
 474                         sizeof(struct tls12_crypto_info_aes_gcm_128) :
 475                         sizeof(struct tls12_crypto_info_aes_gcm_256);
 476                 if (optlen != optsize) {
 477                         rc = -EINVAL;
 478                         goto err_crypto_info;
 479                 }
 480                 rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 481                                     optlen - sizeof(*crypto_info));
 482                 if (rc) {
 483                         rc = -EFAULT;
 484                         goto err_crypto_info;
 485                 }
 486                 break;
 487         }
 488         default:
 489                 rc = -EINVAL;
 490                 goto err_crypto_info;
 491         }
 492
 493         if (tx) {
 494 #ifdef CONFIG_TLS_DEVICE
 495                 rc = tls_set_device_offload(sk, ctx);
 496                 conf = TLS_HW;
 497                 if (rc) {
 498 #else
 499                 {
 500 #endif
 501                         rc = tls_set_sw_offload(sk, ctx, 1);
 502                         conf = TLS_SW;
 503                 }
 504         } else {
 505 #ifdef CONFIG_TLS_DEVICE
 506                 rc = tls_set_device_offload_rx(sk, ctx);
 507                 conf = TLS_HW;
 508                 if (rc) {
 509 #else
 510                 {
 511 #endif
 512                         rc = tls_set_sw_offload(sk, ctx, 0);
 513                         conf = TLS_SW;
 514                 }
 515         }
 516
 517         if (rc)
 518                 goto err_crypto_info;
 519
 520         if (tx)
 521                 ctx->tx_conf = conf;
 522         else
 523                 ctx->rx_conf = conf;
 524         update_sk_prot(sk, ctx);
 525         if (tx) {
 526                 ctx->sk_write_space = sk->sk_write_space;
 527                 sk->sk_write_space = tls_write_space;
 528         } else {
 529                 sk->sk_socket->ops = &tls_sw_proto_ops;
 530         }
 531         goto out;
 532
 533 err_crypto_info:
 534         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 535 out:
 536         return rc;
 537 }
 538
 539 static int do_tls_setsockopt(struct sock *sk, int optname,
 540                              char __user *optval, unsigned int optlen)
 541 {
 542         int rc = 0;
 543
 544         switch (optname) {
 545         case TLS_TX:
 546         case TLS_RX:
 547                 lock_sock(sk);
 548                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 549                                             optname == TLS_TX);
 550                 release_sock(sk);
 551                 break;
 552         default:
 553                 rc = -ENOPROTOOPT;
 554                 break;
 555         }
 556         return rc;
 557 }
 558
 559 static int tls_setsockopt(struct sock *sk, int level, int optname,
 560                           char __user *optval, unsigned int optlen)
 561 {
 562         struct tls_context *ctx = tls_get_ctx(sk);
 563
 564         if (level != SOL_TLS)
 565                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 566
 567         return do_tls_setsockopt(sk, optname, optval, optlen);
 568 }
 569
 570 static struct tls_context *create_ctx(struct sock *sk)
 571 {
 572         struct inet_connection_sock *icsk = inet_csk(sk);
 573         struct tls_context *ctx;
 574
 575         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 576         if (!ctx)
 577                 return NULL;
 578
 579         icsk->icsk_ulp_data = ctx;
 580         ctx->setsockopt = sk->sk_prot->setsockopt;
 581         ctx->getsockopt = sk->sk_prot->getsockopt;
 582         ctx->sk_proto_close = sk->sk_prot->close;
 583         return ctx;
 584 }
 585
 586 static void tls_build_proto(struct sock *sk)
 587 {
 588         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 589
 590         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 591         if (ip_ver == TLSV6 &&
 592             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 593                 mutex_lock(&tcpv6_prot_mutex);
 594                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 595                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 596                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 597                 }
 598                 mutex_unlock(&tcpv6_prot_mutex);
 599         }
 600
 601         if (ip_ver == TLSV4 &&
 602             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
 603                 mutex_lock(&tcpv4_prot_mutex);
 604                 if (likely(sk->sk_prot != saved_tcpv4_prot)) {
 605                         build_protos(tls_prots[TLSV4], sk->sk_prot);
 606                         smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
 607                 }
 608                 mutex_unlock(&tcpv4_prot_mutex);
 609         }
 610 }
 611
 612 static void tls_hw_sk_destruct(struct sock *sk)
 613 {
 614         struct tls_context *ctx = tls_get_ctx(sk);
 615         struct inet_connection_sock *icsk = inet_csk(sk);
 616
 617         ctx->sk_destruct(sk);
 618         /* Free ctx */
 619         kfree(ctx);
 620         icsk->icsk_ulp_data = NULL;
 621 }
 622
 623 static int tls_hw_prot(struct sock *sk)
 624 {
 625         struct tls_context *ctx;
 626         struct tls_device *dev;
 627         int rc = 0;
 628
 629         spin_lock_bh(&device_spinlock);
 630         list_for_each_entry(dev, &device_list, dev_list) {
 631                 if (dev->feature && dev->feature(dev)) {
 632                         ctx = create_ctx(sk);
 633                         if (!ctx)
 634                                 goto out;
 635
 636                         spin_unlock_bh(&device_spinlock);
 637                         tls_build_proto(sk);
 638                         ctx->hash = sk->sk_prot->hash;
 639                         ctx->unhash = sk->sk_prot->unhash;
 640                         ctx->sk_proto_close = sk->sk_prot->close;
 641                         ctx->sk_destruct = sk->sk_destruct;
 642                         sk->sk_destruct = tls_hw_sk_destruct;
 643                         ctx->rx_conf = TLS_HW_RECORD;
 644                         ctx->tx_conf = TLS_HW_RECORD;
 645                         update_sk_prot(sk, ctx);
 646                         spin_lock_bh(&device_spinlock);
 647                         rc = 1;
 648                         break;
 649                 }
 650         }
 651 out:
 652         spin_unlock_bh(&device_spinlock);
 653         return rc;
 654 }
 655
 656 static void tls_hw_unhash(struct sock *sk)
 657 {
 658         struct tls_context *ctx = tls_get_ctx(sk);
 659         struct tls_device *dev;
 660
 661         spin_lock_bh(&device_spinlock);
 662         list_for_each_entry(dev, &device_list, dev_list) {
 663                 if (dev->unhash) {
 664                         kref_get(&dev->kref);
 665                         spin_unlock_bh(&device_spinlock);
 666                         dev->unhash(dev, sk);
 667                         kref_put(&dev->kref, dev->release);
 668                         spin_lock_bh(&device_spinlock);
 669                 }
 670         }
 671         spin_unlock_bh(&device_spinlock);
 672         ctx->unhash(sk);
 673 }
 674
 675 static int tls_hw_hash(struct sock *sk)
 676 {
 677         struct tls_context *ctx = tls_get_ctx(sk);
 678         struct tls_device *dev;
 679         int err;
 680
 681         err = ctx->hash(sk);
 682         spin_lock_bh(&device_spinlock);
 683         list_for_each_entry(dev, &device_list, dev_list) {
 684                 if (dev->hash) {
 685                         kref_get(&dev->kref);
 686                         spin_unlock_bh(&device_spinlock);
 687                         err |= dev->hash(dev, sk);
 688                         kref_put(&dev->kref, dev->release);
 689                         spin_lock_bh(&device_spinlock);
 690                 }
 691         }
 692         spin_unlock_bh(&device_spinlock);
 693
 694         if (err)
 695                 tls_hw_unhash(sk);
 696         return err;
 697 }
 698
 699 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 700                          struct proto *base)
 701 {
 702         prot[TLS_BASE][TLS_BASE] = *base;
 703         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 704         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 705         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 706
 707         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 708         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 709         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 710
 711         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 712         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 713         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 714         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 715
 716         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 717         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 718         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 719         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 720
 721 #ifdef CONFIG_TLS_DEVICE
 722         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 723         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 724         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 725
 726         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 727         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 728         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 729
 730         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 731
 732         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 733
 734         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 735 #endif
 736
 737         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 738         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 739         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 740         prot[TLS_HW_RECORD][TLS_HW_RECORD].close        = tls_sk_proto_close;
 741 }
 742
 743 static int tls_init(struct sock *sk)
 744 {
 745         struct tls_context *ctx;
 746         int rc = 0;
 747
 748         if (tls_hw_prot(sk))
 749                 goto out;
 750
 751         /* The TLS ulp is currently supported only for TCP sockets
 752          * in ESTABLISHED state.
 753          * Supporting sockets in LISTEN state will require us
 754          * to modify the accept implementation to clone rather then
 755          * share the ulp context.
 756          */
 757         if (sk->sk_state != TCP_ESTABLISHED)
 758                 return -ENOTSUPP;
 759
 760         /* allocate tls context */
 761         ctx = create_ctx(sk);
 762         if (!ctx) {
 763                 rc = -ENOMEM;
 764                 goto out;
 765         }
 766
 767         tls_build_proto(sk);
 768         ctx->tx_conf = TLS_BASE;
 769         ctx->rx_conf = TLS_BASE;
 770         update_sk_prot(sk, ctx);
 771 out:
 772         return rc;
 773 }
 774
 775 void tls_register_device(struct tls_device *device)
 776 {
 777         spin_lock_bh(&device_spinlock);
 778         list_add_tail(&device->dev_list, &device_list);
 779         spin_unlock_bh(&device_spinlock);
 780 }
 781 EXPORT_SYMBOL(tls_register_device);
 782
 783 void tls_unregister_device(struct tls_device *device)
 784 {
 785         spin_lock_bh(&device_spinlock);
 786         list_del(&device->dev_list);
 787         spin_unlock_bh(&device_spinlock);
 788 }
 789 EXPORT_SYMBOL(tls_unregister_device);
 790
 791 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 792         .name                   = "tls",
 793         .owner                  = THIS_MODULE,
 794         .init                   = tls_init,
 795 };
 796
 797 static int __init tls_register(void)
 798 {
 799         tls_sw_proto_ops = inet_stream_ops;
 800         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 801
 802 #ifdef CONFIG_TLS_DEVICE
 803         tls_device_init();
 804 #endif
 805         tcp_register_ulp(&tcp_tls_ulp_ops);
 806
 807         return 0;
 808 }
 809
 810 static void __exit tls_unregister(void)
 811 {
 812         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 813 #ifdef CONFIG_TLS_DEVICE
 814         tls_device_cleanup();
 815 #endif
 816 }
 817
 818 module_init(tls_register);
 819 module_exit(tls_unregister);