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         write_unlock_bh(&sk->sk_callback_lock);
 312         release_sock(sk);
 313         if (ctx->tx_conf == TLS_SW)
 314                 tls_sw_free_ctx_tx(ctx);
 315         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 316                 tls_sw_strparser_done(ctx);
 317         if (ctx->rx_conf == TLS_SW)
 318                 tls_sw_free_ctx_rx(ctx);
 319         ctx->sk_proto_close(sk, timeout);
 320
 321         if (free_ctx)
 322                 tls_ctx_free(ctx);
 323 }
 324
 325 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 326                                 int __user *optlen)
 327 {
 328         int rc = 0;
 329         struct tls_context *ctx = tls_get_ctx(sk);
 330         struct tls_crypto_info *crypto_info;
 331         int len;
 332
 333         if (get_user(len, optlen))
 334                 return -EFAULT;
 335
 336         if (!optval || (len < sizeof(*crypto_info))) {
 337                 rc = -EINVAL;
 338                 goto out;
 339         }
 340
 341         if (!ctx) {
 342                 rc = -EBUSY;
 343                 goto out;
 344         }
 345
 346         /* get user crypto info */
 347         crypto_info = &ctx->crypto_send.info;
 348
 349         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 350                 rc = -EBUSY;
 351                 goto out;
 352         }
 353
 354         if (len == sizeof(*crypto_info)) {
 355                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 356                         rc = -EFAULT;
 357                 goto out;
 358         }
 359
 360         switch (crypto_info->cipher_type) {
 361         case TLS_CIPHER_AES_GCM_128: {
 362                 struct tls12_crypto_info_aes_gcm_128 *
 363                   crypto_info_aes_gcm_128 =
 364                   container_of(crypto_info,
 365                                struct tls12_crypto_info_aes_gcm_128,
 366                                info);
 367
 368                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 369                         rc = -EINVAL;
 370                         goto out;
 371                 }
 372                 lock_sock(sk);
 373                 memcpy(crypto_info_aes_gcm_128->iv,
 374                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 375                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 376                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 377                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 378                 release_sock(sk);
 379                 if (copy_to_user(optval,
 380                                  crypto_info_aes_gcm_128,
 381                                  sizeof(*crypto_info_aes_gcm_128)))
 382                         rc = -EFAULT;
 383                 break;
 384         }
 385         case TLS_CIPHER_AES_GCM_256: {
 386                 struct tls12_crypto_info_aes_gcm_256 *
 387                   crypto_info_aes_gcm_256 =
 388                   container_of(crypto_info,
 389                                struct tls12_crypto_info_aes_gcm_256,
 390                                info);
 391
 392                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 393                         rc = -EINVAL;
 394                         goto out;
 395                 }
 396                 lock_sock(sk);
 397                 memcpy(crypto_info_aes_gcm_256->iv,
 398                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 399                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 400                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 401                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 402                 release_sock(sk);
 403                 if (copy_to_user(optval,
 404                                  crypto_info_aes_gcm_256,
 405                                  sizeof(*crypto_info_aes_gcm_256)))
 406                         rc = -EFAULT;
 407                 break;
 408         }
 409         default:
 410                 rc = -EINVAL;
 411         }
 412
 413 out:
 414         return rc;
 415 }
 416
 417 static int do_tls_getsockopt(struct sock *sk, int optname,
 418                              char __user *optval, int __user *optlen)
 419 {
 420         int rc = 0;
 421
 422         switch (optname) {
 423         case TLS_TX:
 424                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 425                 break;
 426         default:
 427                 rc = -ENOPROTOOPT;
 428                 break;
 429         }
 430         return rc;
 431 }
 432
 433 static int tls_getsockopt(struct sock *sk, int level, int optname,
 434                           char __user *optval, int __user *optlen)
 435 {
 436         struct tls_context *ctx = tls_get_ctx(sk);
 437
 438         if (level != SOL_TLS)
 439                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 440
 441         return do_tls_getsockopt(sk, optname, optval, optlen);
 442 }
 443
 444 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 445                                   unsigned int optlen, int tx)
 446 {
 447         struct tls_crypto_info *crypto_info;
 448         struct tls_crypto_info *alt_crypto_info;
 449         struct tls_context *ctx = tls_get_ctx(sk);
 450         size_t optsize;
 451         int rc = 0;
 452         int conf;
 453
 454         if (!optval || (optlen < sizeof(*crypto_info))) {
 455                 rc = -EINVAL;
 456                 goto out;
 457         }
 458
 459         if (tx) {
 460                 crypto_info = &ctx->crypto_send.info;
 461                 alt_crypto_info = &ctx->crypto_recv.info;
 462         } else {
 463                 crypto_info = &ctx->crypto_recv.info;
 464                 alt_crypto_info = &ctx->crypto_send.info;
 465         }
 466
 467         /* Currently we don't support set crypto info more than one time */
 468         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 469                 rc = -EBUSY;
 470                 goto out;
 471         }
 472
 473         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 474         if (rc) {
 475                 rc = -EFAULT;
 476                 goto err_crypto_info;
 477         }
 478
 479         /* check version */
 480         if (crypto_info->version != TLS_1_2_VERSION &&
 481             crypto_info->version != TLS_1_3_VERSION) {
 482                 rc = -ENOTSUPP;
 483                 goto err_crypto_info;
 484         }
 485
 486         /* Ensure that TLS version and ciphers are same in both directions */
 487         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 488                 if (alt_crypto_info->version != crypto_info->version ||
 489                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 490                         rc = -EINVAL;
 491                         goto err_crypto_info;
 492                 }
 493         }
 494
 495         switch (crypto_info->cipher_type) {
 496         case TLS_CIPHER_AES_GCM_128:
 497                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 498                 break;
 499         case TLS_CIPHER_AES_GCM_256: {
 500                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 501                 break;
 502         }
 503         case TLS_CIPHER_AES_CCM_128:
 504                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 505                 break;
 506         default:
 507                 rc = -EINVAL;
 508                 goto err_crypto_info;
 509         }
 510
 511         if (optlen != optsize) {
 512                 rc = -EINVAL;
 513                 goto err_crypto_info;
 514         }
 515
 516         rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 517                             optlen - sizeof(*crypto_info));
 518         if (rc) {
 519                 rc = -EFAULT;
 520                 goto err_crypto_info;
 521         }
 522
 523         if (tx) {
 524 #ifdef CONFIG_TLS_DEVICE
 525                 rc = tls_set_device_offload(sk, ctx);
 526                 conf = TLS_HW;
 527                 if (rc) {
 528 #else
 529                 {
 530 #endif
 531                         rc = tls_set_sw_offload(sk, ctx, 1);
 532                         if (rc)
 533                                 goto err_crypto_info;
 534                         conf = TLS_SW;
 535                 }
 536         } else {
 537 #ifdef CONFIG_TLS_DEVICE
 538                 rc = tls_set_device_offload_rx(sk, ctx);
 539                 conf = TLS_HW;
 540                 if (rc) {
 541 #else
 542                 {
 543 #endif
 544                         rc = tls_set_sw_offload(sk, ctx, 0);
 545                         if (rc)
 546                                 goto err_crypto_info;
 547                         conf = TLS_SW;
 548                 }
 549                 tls_sw_strparser_arm(sk, ctx);
 550         }
 551
 552         if (tx)
 553                 ctx->tx_conf = conf;
 554         else
 555                 ctx->rx_conf = conf;
 556         update_sk_prot(sk, ctx);
 557         if (tx) {
 558                 ctx->sk_write_space = sk->sk_write_space;
 559                 sk->sk_write_space = tls_write_space;
 560         } else {
 561                 sk->sk_socket->ops = &tls_sw_proto_ops;
 562         }
 563         goto out;
 564
 565 err_crypto_info:
 566         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 567 out:
 568         return rc;
 569 }
 570
 571 static int do_tls_setsockopt(struct sock *sk, int optname,
 572                              char __user *optval, unsigned int optlen)
 573 {
 574         int rc = 0;
 575
 576         switch (optname) {
 577         case TLS_TX:
 578         case TLS_RX:
 579                 lock_sock(sk);
 580                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 581                                             optname == TLS_TX);
 582                 release_sock(sk);
 583                 break;
 584         default:
 585                 rc = -ENOPROTOOPT;
 586                 break;
 587         }
 588         return rc;
 589 }
 590
 591 static int tls_setsockopt(struct sock *sk, int level, int optname,
 592                           char __user *optval, unsigned int optlen)
 593 {
 594         struct tls_context *ctx = tls_get_ctx(sk);
 595
 596         if (level != SOL_TLS)
 597                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 598
 599         return do_tls_setsockopt(sk, optname, optval, optlen);
 600 }
 601
 602 static struct tls_context *create_ctx(struct sock *sk)
 603 {
 604         struct inet_connection_sock *icsk = inet_csk(sk);
 605         struct tls_context *ctx;
 606
 607         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 608         if (!ctx)
 609                 return NULL;
 610
 611         icsk->icsk_ulp_data = ctx;
 612         ctx->setsockopt = sk->sk_prot->setsockopt;
 613         ctx->getsockopt = sk->sk_prot->getsockopt;
 614         ctx->sk_proto_close = sk->sk_prot->close;
 615         ctx->unhash = sk->sk_prot->unhash;
 616         return ctx;
 617 }
 618
 619 static void tls_build_proto(struct sock *sk)
 620 {
 621         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 622
 623         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 624         if (ip_ver == TLSV6 &&
 625             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 626                 mutex_lock(&tcpv6_prot_mutex);
 627                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 628                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 629                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 630                 }
 631                 mutex_unlock(&tcpv6_prot_mutex);
 632         }
 633
 634         if (ip_ver == TLSV4 &&
 635             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
 636                 mutex_lock(&tcpv4_prot_mutex);
 637                 if (likely(sk->sk_prot != saved_tcpv4_prot)) {
 638                         build_protos(tls_prots[TLSV4], sk->sk_prot);
 639                         smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
 640                 }
 641                 mutex_unlock(&tcpv4_prot_mutex);
 642         }
 643 }
 644
 645 static void tls_hw_sk_destruct(struct sock *sk)
 646 {
 647         struct tls_context *ctx = tls_get_ctx(sk);
 648         struct inet_connection_sock *icsk = inet_csk(sk);
 649
 650         ctx->sk_destruct(sk);
 651         /* Free ctx */
 652         tls_ctx_free(ctx);
 653         icsk->icsk_ulp_data = NULL;
 654 }
 655
 656 static int tls_hw_prot(struct sock *sk)
 657 {
 658         struct tls_context *ctx;
 659         struct tls_device *dev;
 660         int rc = 0;
 661
 662         spin_lock_bh(&device_spinlock);
 663         list_for_each_entry(dev, &device_list, dev_list) {
 664                 if (dev->feature && dev->feature(dev)) {
 665                         ctx = create_ctx(sk);
 666                         if (!ctx)
 667                                 goto out;
 668
 669                         spin_unlock_bh(&device_spinlock);
 670                         tls_build_proto(sk);
 671                         ctx->hash = sk->sk_prot->hash;
 672                         ctx->unhash = sk->sk_prot->unhash;
 673                         ctx->sk_proto_close = sk->sk_prot->close;
 674                         ctx->sk_destruct = sk->sk_destruct;
 675                         sk->sk_destruct = tls_hw_sk_destruct;
 676                         ctx->rx_conf = TLS_HW_RECORD;
 677                         ctx->tx_conf = TLS_HW_RECORD;
 678                         update_sk_prot(sk, ctx);
 679                         spin_lock_bh(&device_spinlock);
 680                         rc = 1;
 681                         break;
 682                 }
 683         }
 684 out:
 685         spin_unlock_bh(&device_spinlock);
 686         return rc;
 687 }
 688
 689 static void tls_hw_unhash(struct sock *sk)
 690 {
 691         struct tls_context *ctx = tls_get_ctx(sk);
 692         struct tls_device *dev;
 693
 694         spin_lock_bh(&device_spinlock);
 695         list_for_each_entry(dev, &device_list, dev_list) {
 696                 if (dev->unhash) {
 697                         kref_get(&dev->kref);
 698                         spin_unlock_bh(&device_spinlock);
 699                         dev->unhash(dev, sk);
 700                         kref_put(&dev->kref, dev->release);
 701                         spin_lock_bh(&device_spinlock);
 702                 }
 703         }
 704         spin_unlock_bh(&device_spinlock);
 705         ctx->unhash(sk);
 706 }
 707
 708 static int tls_hw_hash(struct sock *sk)
 709 {
 710         struct tls_context *ctx = tls_get_ctx(sk);
 711         struct tls_device *dev;
 712         int err;
 713
 714         err = ctx->hash(sk);
 715         spin_lock_bh(&device_spinlock);
 716         list_for_each_entry(dev, &device_list, dev_list) {
 717                 if (dev->hash) {
 718                         kref_get(&dev->kref);
 719                         spin_unlock_bh(&device_spinlock);
 720                         err |= dev->hash(dev, sk);
 721                         kref_put(&dev->kref, dev->release);
 722                         spin_lock_bh(&device_spinlock);
 723                 }
 724         }
 725         spin_unlock_bh(&device_spinlock);
 726
 727         if (err)
 728                 tls_hw_unhash(sk);
 729         return err;
 730 }
 731
 732 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 733                          struct proto *base)
 734 {
 735         prot[TLS_BASE][TLS_BASE] = *base;
 736         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 737         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 738         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 739
 740         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 741         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 742         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 743
 744         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 745         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 746         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 747         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 748
 749         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 750         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 751         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 752         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 753
 754 #ifdef CONFIG_TLS_DEVICE
 755         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 756         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 757         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 758
 759         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 760         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 761         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 762
 763         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 764
 765         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 766
 767         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 768 #endif
 769
 770         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 771         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 772         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 773 }
 774
 775 static int tls_init(struct sock *sk)
 776 {
 777         struct tls_context *ctx;
 778         int rc = 0;
 779
 780         if (tls_hw_prot(sk))
 781                 return 0;
 782
 783         /* The TLS ulp is currently supported only for TCP sockets
 784          * in ESTABLISHED state.
 785          * Supporting sockets in LISTEN state will require us
 786          * to modify the accept implementation to clone rather then
 787          * share the ulp context.
 788          */
 789         if (sk->sk_state != TCP_ESTABLISHED)
 790                 return -ENOTSUPP;
 791
 792         tls_build_proto(sk);
 793
 794         /* allocate tls context */
 795         write_lock_bh(&sk->sk_callback_lock);
 796         ctx = create_ctx(sk);
 797         if (!ctx) {
 798                 rc = -ENOMEM;
 799                 goto out;
 800         }
 801
 802         ctx->tx_conf = TLS_BASE;
 803         ctx->rx_conf = TLS_BASE;
 804         ctx->sk_proto = sk->sk_prot;
 805         update_sk_prot(sk, ctx);
 806 out:
 807         write_unlock_bh(&sk->sk_callback_lock);
 808         return rc;
 809 }
 810
 811 static void tls_update(struct sock *sk, struct proto *p)
 812 {
 813         struct tls_context *ctx;
 814
 815         ctx = tls_get_ctx(sk);
 816         if (likely(ctx)) {
 817                 ctx->sk_proto_close = p->close;
 818                 ctx->sk_proto = p;
 819         } else {
 820                 sk->sk_prot = p;
 821         }
 822 }
 823
 824 void tls_register_device(struct tls_device *device)
 825 {
 826         spin_lock_bh(&device_spinlock);
 827         list_add_tail(&device->dev_list, &device_list);
 828         spin_unlock_bh(&device_spinlock);
 829 }
 830 EXPORT_SYMBOL(tls_register_device);
 831
 832 void tls_unregister_device(struct tls_device *device)
 833 {
 834         spin_lock_bh(&device_spinlock);
 835         list_del(&device->dev_list);
 836         spin_unlock_bh(&device_spinlock);
 837 }
 838 EXPORT_SYMBOL(tls_unregister_device);
 839
 840 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 841         .name                   = "tls",
 842         .owner                  = THIS_MODULE,
 843         .init                   = tls_init,
 844         .update                 = tls_update,
 845 };
 846
 847 static int __init tls_register(void)
 848 {
 849         tls_sw_proto_ops = inet_stream_ops;
 850         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 851
 852 #ifdef CONFIG_TLS_DEVICE
 853         tls_device_init();
 854 #endif
 855         tcp_register_ulp(&tcp_tls_ulp_ops);
 856
 857         return 0;
 858 }
 859
 860 static void __exit tls_unregister(void)
 861 {
 862         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 863 #ifdef CONFIG_TLS_DEVICE
 864         tls_device_cleanup();
 865 #endif
 866 }
 867
 868 module_init(tls_register);
 869 module_exit(tls_unregister);