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