net/tls/tls_main.c

   1 /*
   2  * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/module.h>
  35
  36 #include <net/tcp.h>
  37 #include <net/inet_common.h>
  38 #include <linux/highmem.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/sched/signal.h>
  41 #include <linux/inetdevice.h>
  42
  43 #include <net/tls.h>
  44
  45 MODULE_AUTHOR("Mellanox Technologies");
  46 MODULE_DESCRIPTION("Transport Layer Security Support");
  47 MODULE_LICENSE("Dual BSD/GPL");
  48 MODULE_ALIAS_TCP_ULP("tls");
  49
  50 enum {
  51         TLSV4,
  52         TLSV6,
  53         TLS_NUM_PROTS,
  54 };
  55
  56 static struct proto *saved_tcpv6_prot;
  57 static DEFINE_MUTEX(tcpv6_prot_mutex);
  58 static struct proto *saved_tcpv4_prot;
  59 static DEFINE_MUTEX(tcpv4_prot_mutex);
  60 static LIST_HEAD(device_list);
  61 static DEFINE_SPINLOCK(device_spinlock);
  62 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  63 static struct proto_ops tls_sw_proto_ops;
  64 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
  65                          struct proto *base);
  66
  67 static void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  68 {
  69         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  70
  71         sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf];
  72 }
  73
  74 int wait_on_pending_writer(struct sock *sk, long *timeo)
  75 {
  76         int rc = 0;
  77         DEFINE_WAIT_FUNC(wait, woken_wake_function);
  78
  79         add_wait_queue(sk_sleep(sk), &wait);
  80         while (1) {
  81                 if (!*timeo) {
  82                         rc = -EAGAIN;
  83                         break;
  84                 }
  85
  86                 if (signal_pending(current)) {
  87                         rc = sock_intr_errno(*timeo);
  88                         break;
  89                 }
  90
  91                 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
  92                         break;
  93         }
  94         remove_wait_queue(sk_sleep(sk), &wait);
  95         return rc;
  96 }
  97
  98 int tls_push_sg(struct sock *sk,
  99                 struct tls_context *ctx,
 100                 struct scatterlist *sg,
 101                 u16 first_offset,
 102                 int flags)
 103 {
 104         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 105         int ret = 0;
 106         struct page *p;
 107         size_t size;
 108         int offset = first_offset;
 109
 110         size = sg->length - offset;
 111         offset += sg->offset;
 112
 113         ctx->in_tcp_sendpages = true;
 114         while (1) {
 115                 if (sg_is_last(sg))
 116                         sendpage_flags = flags;
 117
 118                 /* is sending application-limited? */
 119                 tcp_rate_check_app_limited(sk);
 120                 p = sg_page(sg);
 121 retry:
 122                 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
 123
 124                 if (ret != size) {
 125                         if (ret > 0) {
 126                                 offset += ret;
 127                                 size -= ret;
 128                                 goto retry;
 129                         }
 130
 131                         offset -= sg->offset;
 132                         ctx->partially_sent_offset = offset;
 133                         ctx->partially_sent_record = (void *)sg;
 134                         ctx->in_tcp_sendpages = false;
 135                         return ret;
 136                 }
 137
 138                 put_page(p);
 139                 sk_mem_uncharge(sk, sg->length);
 140                 sg = sg_next(sg);
 141                 if (!sg)
 142                         break;
 143
 144                 offset = sg->offset;
 145                 size = sg->length;
 146         }
 147
 148         ctx->in_tcp_sendpages = false;
 149
 150         return 0;
 151 }
 152
 153 static int tls_handle_open_record(struct sock *sk, int flags)
 154 {
 155         struct tls_context *ctx = tls_get_ctx(sk);
 156
 157         if (tls_is_pending_open_record(ctx))
 158                 return ctx->push_pending_record(sk, flags);
 159
 160         return 0;
 161 }
 162
 163 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 164                       unsigned char *record_type)
 165 {
 166         struct cmsghdr *cmsg;
 167         int rc = -EINVAL;
 168
 169         for_each_cmsghdr(cmsg, msg) {
 170                 if (!CMSG_OK(msg, cmsg))
 171                         return -EINVAL;
 172                 if (cmsg->cmsg_level != SOL_TLS)
 173                         continue;
 174
 175                 switch (cmsg->cmsg_type) {
 176                 case TLS_SET_RECORD_TYPE:
 177                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 178                                 return -EINVAL;
 179
 180                         if (msg->msg_flags & MSG_MORE)
 181                                 return -EINVAL;
 182
 183                         rc = tls_handle_open_record(sk, msg->msg_flags);
 184                         if (rc)
 185                                 return rc;
 186
 187                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 188                         rc = 0;
 189                         break;
 190                 default:
 191                         return -EINVAL;
 192                 }
 193         }
 194
 195         return rc;
 196 }
 197
 198 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 199                             int flags)
 200 {
 201         struct scatterlist *sg;
 202         u16 offset;
 203
 204         sg = ctx->partially_sent_record;
 205         offset = ctx->partially_sent_offset;
 206
 207         ctx->partially_sent_record = NULL;
 208         return tls_push_sg(sk, ctx, sg, offset, flags);
 209 }
 210
 211 bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 212 {
 213         struct scatterlist *sg;
 214
 215         sg = ctx->partially_sent_record;
 216         if (!sg)
 217                 return false;
 218
 219         while (1) {
 220                 put_page(sg_page(sg));
 221                 sk_mem_uncharge(sk, sg->length);
 222
 223                 if (sg_is_last(sg))
 224                         break;
 225                 sg++;
 226         }
 227         ctx->partially_sent_record = NULL;
 228         return true;
 229 }
 230
 231 static void tls_write_space(struct sock *sk)
 232 {
 233         struct tls_context *ctx = tls_get_ctx(sk);
 234
 235         /* If in_tcp_sendpages call lower protocol write space handler
 236          * to ensure we wake up any waiting operations there. For example
 237          * if do_tcp_sendpages where to call sk_wait_event.
 238          */
 239         if (ctx->in_tcp_sendpages) {
 240                 ctx->sk_write_space(sk);
 241                 return;
 242         }
 243
 244 #ifdef CONFIG_TLS_DEVICE
 245         if (ctx->tx_conf == TLS_HW)
 246                 tls_device_write_space(sk, ctx);
 247         else
 248 #endif
 249                 tls_sw_write_space(sk, ctx);
 250
 251         ctx->sk_write_space(sk);
 252 }
 253
 254 void tls_ctx_free(struct tls_context *ctx)
 255 {
 256         if (!ctx)
 257                 return;
 258
 259         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 260         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 261         kfree(ctx);
 262 }
 263
 264 static void tls_sk_proto_cleanup(struct sock *sk,
 265                                  struct tls_context *ctx, long timeo)
 266 {
 267         if (unlikely(sk->sk_write_pending) &&
 268             !wait_on_pending_writer(sk, &timeo))
 269                 tls_handle_open_record(sk, 0);
 270
 271         /* We need these for tls_sw_fallback handling of other packets */
 272         if (ctx->tx_conf == TLS_SW) {
 273                 kfree(ctx->tx.rec_seq);
 274                 kfree(ctx->tx.iv);
 275                 tls_sw_release_resources_tx(sk);
 276 #ifdef CONFIG_TLS_DEVICE
 277         } else if (ctx->tx_conf == TLS_HW) {
 278                 tls_device_free_resources_tx(sk);
 279 #endif
 280         }
 281
 282         if (ctx->rx_conf == TLS_SW)
 283                 tls_sw_release_resources_rx(sk);
 284
 285 #ifdef CONFIG_TLS_DEVICE
 286         if (ctx->rx_conf == TLS_HW)
 287                 tls_device_offload_cleanup_rx(sk);
 288 #endif
 289 }
 290
 291 static void tls_sk_proto_close(struct sock *sk, long timeout)
 292 {
 293         struct inet_connection_sock *icsk = inet_csk(sk);
 294         struct tls_context *ctx = tls_get_ctx(sk);
 295         long timeo = sock_sndtimeo(sk, 0);
 296         bool free_ctx;
 297
 298         if (ctx->tx_conf == TLS_SW)
 299                 tls_sw_cancel_work_tx(ctx);
 300
 301         lock_sock(sk);
 302         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 303
 304         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 305                 tls_sk_proto_cleanup(sk, ctx, timeo);
 306
 307         write_lock_bh(&sk->sk_callback_lock);
 308         if (free_ctx)
 309                 icsk->icsk_ulp_data = NULL;
 310         sk->sk_prot = ctx->sk_proto;
 311         if (sk->sk_write_space == tls_write_space)
 312                 sk->sk_write_space = ctx->sk_write_space;
 313         write_unlock_bh(&sk->sk_callback_lock);
 314         release_sock(sk);
 315         if (ctx->tx_conf == TLS_SW)
 316                 tls_sw_free_ctx_tx(ctx);
 317         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 318                 tls_sw_strparser_done(ctx);
 319         if (ctx->rx_conf == TLS_SW)
 320                 tls_sw_free_ctx_rx(ctx);
 321         ctx->sk_proto_close(sk, timeout);
 322
 323         if (free_ctx)
 324                 tls_ctx_free(ctx);
 325 }
 326
 327 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 328                                 int __user *optlen)
 329 {
 330         int rc = 0;
 331         struct tls_context *ctx = tls_get_ctx(sk);
 332         struct tls_crypto_info *crypto_info;
 333         int len;
 334
 335         if (get_user(len, optlen))
 336                 return -EFAULT;
 337
 338         if (!optval || (len < sizeof(*crypto_info))) {
 339                 rc = -EINVAL;
 340                 goto out;
 341         }
 342
 343         if (!ctx) {
 344                 rc = -EBUSY;
 345                 goto out;
 346         }
 347
 348         /* get user crypto info */
 349         crypto_info = &ctx->crypto_send.info;
 350
 351         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 352                 rc = -EBUSY;
 353                 goto out;
 354         }
 355
 356         if (len == sizeof(*crypto_info)) {
 357                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 358                         rc = -EFAULT;
 359                 goto out;
 360         }
 361
 362         switch (crypto_info->cipher_type) {
 363         case TLS_CIPHER_AES_GCM_128: {
 364                 struct tls12_crypto_info_aes_gcm_128 *
 365                   crypto_info_aes_gcm_128 =
 366                   container_of(crypto_info,
 367                                struct tls12_crypto_info_aes_gcm_128,
 368                                info);
 369
 370                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 371                         rc = -EINVAL;
 372                         goto out;
 373                 }
 374                 lock_sock(sk);
 375                 memcpy(crypto_info_aes_gcm_128->iv,
 376                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 377                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 378                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 379                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 380                 release_sock(sk);
 381                 if (copy_to_user(optval,
 382                                  crypto_info_aes_gcm_128,
 383                                  sizeof(*crypto_info_aes_gcm_128)))
 384                         rc = -EFAULT;
 385                 break;
 386         }
 387         case TLS_CIPHER_AES_GCM_256: {
 388                 struct tls12_crypto_info_aes_gcm_256 *
 389                   crypto_info_aes_gcm_256 =
 390                   container_of(crypto_info,
 391                                struct tls12_crypto_info_aes_gcm_256,
 392                                info);
 393
 394                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 395                         rc = -EINVAL;
 396                         goto out;
 397                 }
 398                 lock_sock(sk);
 399                 memcpy(crypto_info_aes_gcm_256->iv,
 400                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 401                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 402                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 403                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 404                 release_sock(sk);
 405                 if (copy_to_user(optval,
 406                                  crypto_info_aes_gcm_256,
 407                                  sizeof(*crypto_info_aes_gcm_256)))
 408                         rc = -EFAULT;
 409                 break;
 410         }
 411         default:
 412                 rc = -EINVAL;
 413         }
 414
 415 out:
 416         return rc;
 417 }
 418
 419 static int do_tls_getsockopt(struct sock *sk, int optname,
 420                              char __user *optval, int __user *optlen)
 421 {
 422         int rc = 0;
 423
 424         switch (optname) {
 425         case TLS_TX:
 426                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 427                 break;
 428         default:
 429                 rc = -ENOPROTOOPT;
 430                 break;
 431         }
 432         return rc;
 433 }
 434
 435 static int tls_getsockopt(struct sock *sk, int level, int optname,
 436                           char __user *optval, int __user *optlen)
 437 {
 438         struct tls_context *ctx = tls_get_ctx(sk);
 439
 440         if (level != SOL_TLS)
 441                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 442
 443         return do_tls_getsockopt(sk, optname, optval, optlen);
 444 }
 445
 446 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 447                                   unsigned int optlen, int tx)
 448 {
 449         struct tls_crypto_info *crypto_info;
 450         struct tls_crypto_info *alt_crypto_info;
 451         struct tls_context *ctx = tls_get_ctx(sk);
 452         size_t optsize;
 453         int rc = 0;
 454         int conf;
 455
 456         if (!optval || (optlen < sizeof(*crypto_info))) {
 457                 rc = -EINVAL;
 458                 goto out;
 459         }
 460
 461         if (tx) {
 462                 crypto_info = &ctx->crypto_send.info;
 463                 alt_crypto_info = &ctx->crypto_recv.info;
 464         } else {
 465                 crypto_info = &ctx->crypto_recv.info;
 466                 alt_crypto_info = &ctx->crypto_send.info;
 467         }
 468
 469         /* Currently we don't support set crypto info more than one time */
 470         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 471                 rc = -EBUSY;
 472                 goto out;
 473         }
 474
 475         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 476         if (rc) {
 477                 rc = -EFAULT;
 478                 goto err_crypto_info;
 479         }
 480
 481         /* check version */
 482         if (crypto_info->version != TLS_1_2_VERSION &&
 483             crypto_info->version != TLS_1_3_VERSION) {
 484                 rc = -ENOTSUPP;
 485                 goto err_crypto_info;
 486         }
 487
 488         /* Ensure that TLS version and ciphers are same in both directions */
 489         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 490                 if (alt_crypto_info->version != crypto_info->version ||
 491                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 492                         rc = -EINVAL;
 493                         goto err_crypto_info;
 494                 }
 495         }
 496
 497         switch (crypto_info->cipher_type) {
 498         case TLS_CIPHER_AES_GCM_128:
 499                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 500                 break;
 501         case TLS_CIPHER_AES_GCM_256: {
 502                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 503                 break;
 504         }
 505         case TLS_CIPHER_AES_CCM_128:
 506                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 507                 break;
 508         default:
 509                 rc = -EINVAL;
 510                 goto err_crypto_info;
 511         }
 512
 513         if (optlen != optsize) {
 514                 rc = -EINVAL;
 515                 goto err_crypto_info;
 516         }
 517
 518         rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 519                             optlen - sizeof(*crypto_info));
 520         if (rc) {
 521                 rc = -EFAULT;
 522                 goto err_crypto_info;
 523         }
 524
 525         if (tx) {
 526 #ifdef CONFIG_TLS_DEVICE
 527                 rc = tls_set_device_offload(sk, ctx);
 528                 conf = TLS_HW;
 529                 if (rc) {
 530 #else
 531                 {
 532 #endif
 533                         rc = tls_set_sw_offload(sk, ctx, 1);
 534                         if (rc)
 535                                 goto err_crypto_info;
 536                         conf = TLS_SW;
 537                 }
 538         } else {
 539 #ifdef CONFIG_TLS_DEVICE
 540                 rc = tls_set_device_offload_rx(sk, ctx);
 541                 conf = TLS_HW;
 542                 if (rc) {
 543 #else
 544                 {
 545 #endif
 546                         rc = tls_set_sw_offload(sk, ctx, 0);
 547                         if (rc)
 548                                 goto err_crypto_info;
 549                         conf = TLS_SW;
 550                 }
 551                 tls_sw_strparser_arm(sk, ctx);
 552         }
 553
 554         if (tx)
 555                 ctx->tx_conf = conf;
 556         else
 557                 ctx->rx_conf = conf;
 558         update_sk_prot(sk, ctx);
 559         if (tx) {
 560                 ctx->sk_write_space = sk->sk_write_space;
 561                 sk->sk_write_space = tls_write_space;
 562         } else {
 563                 sk->sk_socket->ops = &tls_sw_proto_ops;
 564         }
 565         goto out;
 566
 567 err_crypto_info:
 568         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 569 out:
 570         return rc;
 571 }
 572
 573 static int do_tls_setsockopt(struct sock *sk, int optname,
 574                              char __user *optval, unsigned int optlen)
 575 {
 576         int rc = 0;
 577
 578         switch (optname) {
 579         case TLS_TX:
 580         case TLS_RX:
 581                 lock_sock(sk);
 582                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 583                                             optname == TLS_TX);
 584                 release_sock(sk);
 585                 break;
 586         default:
 587                 rc = -ENOPROTOOPT;
 588                 break;
 589         }
 590         return rc;
 591 }
 592
 593 static int tls_setsockopt(struct sock *sk, int level, int optname,
 594                           char __user *optval, unsigned int optlen)
 595 {
 596         struct tls_context *ctx = tls_get_ctx(sk);
 597
 598         if (level != SOL_TLS)
 599                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 600
 601         return do_tls_setsockopt(sk, optname, optval, optlen);
 602 }
 603
 604 static struct tls_context *create_ctx(struct sock *sk)
 605 {
 606         struct inet_connection_sock *icsk = inet_csk(sk);
 607         struct tls_context *ctx;
 608
 609         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 610         if (!ctx)
 611                 return NULL;
 612
 613         icsk->icsk_ulp_data = ctx;
 614         ctx->setsockopt = sk->sk_prot->setsockopt;
 615         ctx->getsockopt = sk->sk_prot->getsockopt;
 616         ctx->sk_proto_close = sk->sk_prot->close;
 617         ctx->unhash = sk->sk_prot->unhash;
 618         return ctx;
 619 }
 620
 621 static void tls_build_proto(struct sock *sk)
 622 {
 623         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 624
 625         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 626         if (ip_ver == TLSV6 &&
 627             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 628                 mutex_lock(&tcpv6_prot_mutex);
 629                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 630                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 631                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 632                 }
 633                 mutex_unlock(&tcpv6_prot_mutex);
 634         }
 635
 636         if (ip_ver == TLSV4 &&
 637             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
 638                 mutex_lock(&tcpv4_prot_mutex);
 639                 if (likely(sk->sk_prot != saved_tcpv4_prot)) {
 640                         build_protos(tls_prots[TLSV4], sk->sk_prot);
 641                         smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
 642                 }
 643                 mutex_unlock(&tcpv4_prot_mutex);
 644         }
 645 }
 646
 647 static void tls_hw_sk_destruct(struct sock *sk)
 648 {
 649         struct tls_context *ctx = tls_get_ctx(sk);
 650         struct inet_connection_sock *icsk = inet_csk(sk);
 651
 652         ctx->sk_destruct(sk);
 653         /* Free ctx */
 654         tls_ctx_free(ctx);
 655         icsk->icsk_ulp_data = NULL;
 656 }
 657
 658 static int tls_hw_prot(struct sock *sk)
 659 {
 660         struct tls_context *ctx;
 661         struct tls_device *dev;
 662         int rc = 0;
 663
 664         spin_lock_bh(&device_spinlock);
 665         list_for_each_entry(dev, &device_list, dev_list) {
 666                 if (dev->feature && dev->feature(dev)) {
 667                         ctx = create_ctx(sk);
 668                         if (!ctx)
 669                                 goto out;
 670
 671                         spin_unlock_bh(&device_spinlock);
 672                         tls_build_proto(sk);
 673                         ctx->hash = sk->sk_prot->hash;
 674                         ctx->unhash = sk->sk_prot->unhash;
 675                         ctx->sk_proto_close = sk->sk_prot->close;
 676                         ctx->sk_destruct = sk->sk_destruct;
 677                         sk->sk_destruct = tls_hw_sk_destruct;
 678                         ctx->rx_conf = TLS_HW_RECORD;
 679                         ctx->tx_conf = TLS_HW_RECORD;
 680                         update_sk_prot(sk, ctx);
 681                         spin_lock_bh(&device_spinlock);
 682                         rc = 1;
 683                         break;
 684                 }
 685         }
 686 out:
 687         spin_unlock_bh(&device_spinlock);
 688         return rc;
 689 }
 690
 691 static void tls_hw_unhash(struct sock *sk)
 692 {
 693         struct tls_context *ctx = tls_get_ctx(sk);
 694         struct tls_device *dev;
 695
 696         spin_lock_bh(&device_spinlock);
 697         list_for_each_entry(dev, &device_list, dev_list) {
 698                 if (dev->unhash) {
 699                         kref_get(&dev->kref);
 700                         spin_unlock_bh(&device_spinlock);
 701                         dev->unhash(dev, sk);
 702                         kref_put(&dev->kref, dev->release);
 703                         spin_lock_bh(&device_spinlock);
 704                 }
 705         }
 706         spin_unlock_bh(&device_spinlock);
 707         ctx->unhash(sk);
 708 }
 709
 710 static int tls_hw_hash(struct sock *sk)
 711 {
 712         struct tls_context *ctx = tls_get_ctx(sk);
 713         struct tls_device *dev;
 714         int err;
 715
 716         err = ctx->hash(sk);
 717         spin_lock_bh(&device_spinlock);
 718         list_for_each_entry(dev, &device_list, dev_list) {
 719                 if (dev->hash) {
 720                         kref_get(&dev->kref);
 721                         spin_unlock_bh(&device_spinlock);
 722                         err |= dev->hash(dev, sk);
 723                         kref_put(&dev->kref, dev->release);
 724                         spin_lock_bh(&device_spinlock);
 725                 }
 726         }
 727         spin_unlock_bh(&device_spinlock);
 728
 729         if (err)
 730                 tls_hw_unhash(sk);
 731         return err;
 732 }
 733
 734 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 735                          struct proto *base)
 736 {
 737         prot[TLS_BASE][TLS_BASE] = *base;
 738         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 739         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 740         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 741
 742         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 743         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 744         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 745
 746         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 747         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 748         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 749         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 750
 751         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 752         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 753         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 754         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 755
 756 #ifdef CONFIG_TLS_DEVICE
 757         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 758         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 759         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 760
 761         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 762         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 763         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 764
 765         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 766
 767         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 768
 769         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 770 #endif
 771
 772         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 773         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 774         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 775 }
 776
 777 static int tls_init(struct sock *sk)
 778 {
 779         struct tls_context *ctx;
 780         int rc = 0;
 781
 782         if (tls_hw_prot(sk))
 783                 return 0;
 784
 785         /* The TLS ulp is currently supported only for TCP sockets
 786          * in ESTABLISHED state.
 787          * Supporting sockets in LISTEN state will require us
 788          * to modify the accept implementation to clone rather then
 789          * share the ulp context.
 790          */
 791         if (sk->sk_state != TCP_ESTABLISHED)
 792                 return -ENOTSUPP;
 793
 794         tls_build_proto(sk);
 795
 796         /* allocate tls context */
 797         write_lock_bh(&sk->sk_callback_lock);
 798         ctx = create_ctx(sk);
 799         if (!ctx) {
 800                 rc = -ENOMEM;
 801                 goto out;
 802         }
 803
 804         ctx->tx_conf = TLS_BASE;
 805         ctx->rx_conf = TLS_BASE;
 806         ctx->sk_proto = sk->sk_prot;
 807         update_sk_prot(sk, ctx);
 808 out:
 809         write_unlock_bh(&sk->sk_callback_lock);
 810         return rc;
 811 }
 812
 813 static void tls_update(struct sock *sk, struct proto *p)
 814 {
 815         struct tls_context *ctx;
 816
 817         ctx = tls_get_ctx(sk);
 818         if (likely(ctx)) {
 819                 ctx->sk_proto_close = p->close;
 820                 ctx->sk_proto = p;
 821         } else {
 822                 sk->sk_prot = p;
 823         }
 824 }
 825
 826 void tls_register_device(struct tls_device *device)
 827 {
 828         spin_lock_bh(&device_spinlock);
 829         list_add_tail(&device->dev_list, &device_list);
 830         spin_unlock_bh(&device_spinlock);
 831 }
 832 EXPORT_SYMBOL(tls_register_device);
 833
 834 void tls_unregister_device(struct tls_device *device)
 835 {
 836         spin_lock_bh(&device_spinlock);
 837         list_del(&device->dev_list);
 838         spin_unlock_bh(&device_spinlock);
 839 }
 840 EXPORT_SYMBOL(tls_unregister_device);
 841
 842 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 843         .name                   = "tls",
 844         .owner                  = THIS_MODULE,
 845         .init                   = tls_init,
 846         .update                 = tls_update,
 847 };
 848
 849 static int __init tls_register(void)
 850 {
 851         tls_sw_proto_ops = inet_stream_ops;
 852         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 853
 854 #ifdef CONFIG_TLS_DEVICE
 855         tls_device_init();
 856 #endif
 857         tcp_register_ulp(&tcp_tls_ulp_ops);
 858
 859         return 0;
 860 }
 861
 862 static void __exit tls_unregister(void)
 863 {
 864         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 865 #ifdef CONFIG_TLS_DEVICE
 866         tls_device_cleanup();
 867 #endif
 868 }
 869
 870 module_init(tls_register);
 871 module_exit(tls_unregister);