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 #include <linux/inet_diag.h>
  43
  44 #include <net/tls.h>
  45
  46 MODULE_AUTHOR("Mellanox Technologies");
  47 MODULE_DESCRIPTION("Transport Layer Security Support");
  48 MODULE_LICENSE("Dual BSD/GPL");
  49 MODULE_ALIAS_TCP_ULP("tls");
  50
  51 enum {
  52         TLSV4,
  53         TLSV6,
  54         TLS_NUM_PROTS,
  55 };
  56
  57 static struct proto *saved_tcpv6_prot;
  58 static DEFINE_MUTEX(tcpv6_prot_mutex);
  59 static struct proto *saved_tcpv4_prot;
  60 static DEFINE_MUTEX(tcpv4_prot_mutex);
  61 static LIST_HEAD(device_list);
  62 static DEFINE_SPINLOCK(device_spinlock);
  63 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  64 static struct proto_ops tls_sw_proto_ops;
  65 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
  66                          struct proto *base);
  67
  68 static void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  69 {
  70         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  71
  72         sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf];
  73 }
  74
  75 int wait_on_pending_writer(struct sock *sk, long *timeo)
  76 {
  77         int rc = 0;
  78         DEFINE_WAIT_FUNC(wait, woken_wake_function);
  79
  80         add_wait_queue(sk_sleep(sk), &wait);
  81         while (1) {
  82                 if (!*timeo) {
  83                         rc = -EAGAIN;
  84                         break;
  85                 }
  86
  87                 if (signal_pending(current)) {
  88                         rc = sock_intr_errno(*timeo);
  89                         break;
  90                 }
  91
  92                 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
  93                         break;
  94         }
  95         remove_wait_queue(sk_sleep(sk), &wait);
  96         return rc;
  97 }
  98
  99 int tls_push_sg(struct sock *sk,
 100                 struct tls_context *ctx,
 101                 struct scatterlist *sg,
 102                 u16 first_offset,
 103                 int flags)
 104 {
 105         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 106         int ret = 0;
 107         struct page *p;
 108         size_t size;
 109         int offset = first_offset;
 110
 111         size = sg->length - offset;
 112         offset += sg->offset;
 113
 114         ctx->in_tcp_sendpages = true;
 115         while (1) {
 116                 if (sg_is_last(sg))
 117                         sendpage_flags = flags;
 118
 119                 /* is sending application-limited? */
 120                 tcp_rate_check_app_limited(sk);
 121                 p = sg_page(sg);
 122 retry:
 123                 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
 124
 125                 if (ret != size) {
 126                         if (ret > 0) {
 127                                 offset += ret;
 128                                 size -= ret;
 129                                 goto retry;
 130                         }
 131
 132                         offset -= sg->offset;
 133                         ctx->partially_sent_offset = offset;
 134                         ctx->partially_sent_record = (void *)sg;
 135                         ctx->in_tcp_sendpages = false;
 136                         return ret;
 137                 }
 138
 139                 put_page(p);
 140                 sk_mem_uncharge(sk, sg->length);
 141                 sg = sg_next(sg);
 142                 if (!sg)
 143                         break;
 144
 145                 offset = sg->offset;
 146                 size = sg->length;
 147         }
 148
 149         ctx->in_tcp_sendpages = false;
 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 bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 213 {
 214         struct scatterlist *sg;
 215
 216         sg = ctx->partially_sent_record;
 217         if (!sg)
 218                 return false;
 219
 220         while (1) {
 221                 put_page(sg_page(sg));
 222                 sk_mem_uncharge(sk, sg->length);
 223
 224                 if (sg_is_last(sg))
 225                         break;
 226                 sg++;
 227         }
 228         ctx->partially_sent_record = NULL;
 229         return true;
 230 }
 231
 232 static void tls_write_space(struct sock *sk)
 233 {
 234         struct tls_context *ctx = tls_get_ctx(sk);
 235
 236         /* If in_tcp_sendpages call lower protocol write space handler
 237          * to ensure we wake up any waiting operations there. For example
 238          * if do_tcp_sendpages where to call sk_wait_event.
 239          */
 240         if (ctx->in_tcp_sendpages) {
 241                 ctx->sk_write_space(sk);
 242                 return;
 243         }
 244
 245 #ifdef CONFIG_TLS_DEVICE
 246         if (ctx->tx_conf == TLS_HW)
 247                 tls_device_write_space(sk, ctx);
 248         else
 249 #endif
 250                 tls_sw_write_space(sk, ctx);
 251
 252         ctx->sk_write_space(sk);
 253 }
 254
 255 /**
 256  * tls_ctx_free() - free TLS ULP context
 257  * @sk:  socket to with @ctx is attached
 258  * @ctx: TLS context structure
 259  *
 260  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 261  * to which @ctx was attached has no outstanding references.
 262  */
 263 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 264 {
 265         if (!ctx)
 266                 return;
 267
 268         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 269         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 270         mutex_destroy(&ctx->tx_lock);
 271
 272         if (sk)
 273                 kfree_rcu(ctx, rcu);
 274         else
 275                 kfree(ctx);
 276 }
 277
 278 static void tls_sk_proto_cleanup(struct sock *sk,
 279                                  struct tls_context *ctx, long timeo)
 280 {
 281         if (unlikely(sk->sk_write_pending) &&
 282             !wait_on_pending_writer(sk, &timeo))
 283                 tls_handle_open_record(sk, 0);
 284
 285         /* We need these for tls_sw_fallback handling of other packets */
 286         if (ctx->tx_conf == TLS_SW) {
 287                 kfree(ctx->tx.rec_seq);
 288                 kfree(ctx->tx.iv);
 289                 tls_sw_release_resources_tx(sk);
 290         } else if (ctx->tx_conf == TLS_HW) {
 291                 tls_device_free_resources_tx(sk);
 292         }
 293
 294         if (ctx->rx_conf == TLS_SW)
 295                 tls_sw_release_resources_rx(sk);
 296         else if (ctx->rx_conf == TLS_HW)
 297                 tls_device_offload_cleanup_rx(sk);
 298 }
 299
 300 static void tls_sk_proto_close(struct sock *sk, long timeout)
 301 {
 302         struct inet_connection_sock *icsk = inet_csk(sk);
 303         struct tls_context *ctx = tls_get_ctx(sk);
 304         long timeo = sock_sndtimeo(sk, 0);
 305         bool free_ctx;
 306
 307         if (ctx->tx_conf == TLS_SW)
 308                 tls_sw_cancel_work_tx(ctx);
 309
 310         lock_sock(sk);
 311         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 312
 313         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 314                 tls_sk_proto_cleanup(sk, ctx, timeo);
 315
 316         write_lock_bh(&sk->sk_callback_lock);
 317         if (free_ctx)
 318                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 319         sk->sk_prot = ctx->sk_proto;
 320         if (sk->sk_write_space == tls_write_space)
 321                 sk->sk_write_space = ctx->sk_write_space;
 322         write_unlock_bh(&sk->sk_callback_lock);
 323         release_sock(sk);
 324         if (ctx->tx_conf == TLS_SW)
 325                 tls_sw_free_ctx_tx(ctx);
 326         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 327                 tls_sw_strparser_done(ctx);
 328         if (ctx->rx_conf == TLS_SW)
 329                 tls_sw_free_ctx_rx(ctx);
 330         ctx->sk_proto->close(sk, timeout);
 331
 332         if (free_ctx)
 333                 tls_ctx_free(sk, ctx);
 334 }
 335
 336 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 337                                 int __user *optlen)
 338 {
 339         int rc = 0;
 340         struct tls_context *ctx = tls_get_ctx(sk);
 341         struct tls_crypto_info *crypto_info;
 342         int len;
 343
 344         if (get_user(len, optlen))
 345                 return -EFAULT;
 346
 347         if (!optval || (len < sizeof(*crypto_info))) {
 348                 rc = -EINVAL;
 349                 goto out;
 350         }
 351
 352         if (!ctx) {
 353                 rc = -EBUSY;
 354                 goto out;
 355         }
 356
 357         /* get user crypto info */
 358         crypto_info = &ctx->crypto_send.info;
 359
 360         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 361                 rc = -EBUSY;
 362                 goto out;
 363         }
 364
 365         if (len == sizeof(*crypto_info)) {
 366                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 367                         rc = -EFAULT;
 368                 goto out;
 369         }
 370
 371         switch (crypto_info->cipher_type) {
 372         case TLS_CIPHER_AES_GCM_128: {
 373                 struct tls12_crypto_info_aes_gcm_128 *
 374                   crypto_info_aes_gcm_128 =
 375                   container_of(crypto_info,
 376                                struct tls12_crypto_info_aes_gcm_128,
 377                                info);
 378
 379                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 380                         rc = -EINVAL;
 381                         goto out;
 382                 }
 383                 lock_sock(sk);
 384                 memcpy(crypto_info_aes_gcm_128->iv,
 385                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 386                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 387                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 388                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 389                 release_sock(sk);
 390                 if (copy_to_user(optval,
 391                                  crypto_info_aes_gcm_128,
 392                                  sizeof(*crypto_info_aes_gcm_128)))
 393                         rc = -EFAULT;
 394                 break;
 395         }
 396         case TLS_CIPHER_AES_GCM_256: {
 397                 struct tls12_crypto_info_aes_gcm_256 *
 398                   crypto_info_aes_gcm_256 =
 399                   container_of(crypto_info,
 400                                struct tls12_crypto_info_aes_gcm_256,
 401                                info);
 402
 403                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 404                         rc = -EINVAL;
 405                         goto out;
 406                 }
 407                 lock_sock(sk);
 408                 memcpy(crypto_info_aes_gcm_256->iv,
 409                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 410                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 411                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 412                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 413                 release_sock(sk);
 414                 if (copy_to_user(optval,
 415                                  crypto_info_aes_gcm_256,
 416                                  sizeof(*crypto_info_aes_gcm_256)))
 417                         rc = -EFAULT;
 418                 break;
 419         }
 420         default:
 421                 rc = -EINVAL;
 422         }
 423
 424 out:
 425         return rc;
 426 }
 427
 428 static int do_tls_getsockopt(struct sock *sk, int optname,
 429                              char __user *optval, int __user *optlen)
 430 {
 431         int rc = 0;
 432
 433         switch (optname) {
 434         case TLS_TX:
 435                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 436                 break;
 437         default:
 438                 rc = -ENOPROTOOPT;
 439                 break;
 440         }
 441         return rc;
 442 }
 443
 444 static int tls_getsockopt(struct sock *sk, int level, int optname,
 445                           char __user *optval, int __user *optlen)
 446 {
 447         struct tls_context *ctx = tls_get_ctx(sk);
 448
 449         if (level != SOL_TLS)
 450                 return ctx->sk_proto->getsockopt(sk, level,
 451                                                  optname, optval, optlen);
 452
 453         return do_tls_getsockopt(sk, optname, optval, optlen);
 454 }
 455
 456 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 457                                   unsigned int optlen, int tx)
 458 {
 459         struct tls_crypto_info *crypto_info;
 460         struct tls_crypto_info *alt_crypto_info;
 461         struct tls_context *ctx = tls_get_ctx(sk);
 462         size_t optsize;
 463         int rc = 0;
 464         int conf;
 465
 466         if (!optval || (optlen < sizeof(*crypto_info))) {
 467                 rc = -EINVAL;
 468                 goto out;
 469         }
 470
 471         if (tx) {
 472                 crypto_info = &ctx->crypto_send.info;
 473                 alt_crypto_info = &ctx->crypto_recv.info;
 474         } else {
 475                 crypto_info = &ctx->crypto_recv.info;
 476                 alt_crypto_info = &ctx->crypto_send.info;
 477         }
 478
 479         /* Currently we don't support set crypto info more than one time */
 480         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 481                 rc = -EBUSY;
 482                 goto out;
 483         }
 484
 485         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 486         if (rc) {
 487                 rc = -EFAULT;
 488                 goto err_crypto_info;
 489         }
 490
 491         /* check version */
 492         if (crypto_info->version != TLS_1_2_VERSION &&
 493             crypto_info->version != TLS_1_3_VERSION) {
 494                 rc = -ENOTSUPP;
 495                 goto err_crypto_info;
 496         }
 497
 498         /* Ensure that TLS version and ciphers are same in both directions */
 499         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 500                 if (alt_crypto_info->version != crypto_info->version ||
 501                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 502                         rc = -EINVAL;
 503                         goto err_crypto_info;
 504                 }
 505         }
 506
 507         switch (crypto_info->cipher_type) {
 508         case TLS_CIPHER_AES_GCM_128:
 509                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 510                 break;
 511         case TLS_CIPHER_AES_GCM_256: {
 512                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 513                 break;
 514         }
 515         case TLS_CIPHER_AES_CCM_128:
 516                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 517                 break;
 518         default:
 519                 rc = -EINVAL;
 520                 goto err_crypto_info;
 521         }
 522
 523         if (optlen != optsize) {
 524                 rc = -EINVAL;
 525                 goto err_crypto_info;
 526         }
 527
 528         rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 529                             optlen - sizeof(*crypto_info));
 530         if (rc) {
 531                 rc = -EFAULT;
 532                 goto err_crypto_info;
 533         }
 534
 535         if (tx) {
 536                 rc = tls_set_device_offload(sk, ctx);
 537                 conf = TLS_HW;
 538                 if (rc) {
 539                         rc = tls_set_sw_offload(sk, ctx, 1);
 540                         if (rc)
 541                                 goto err_crypto_info;
 542                         conf = TLS_SW;
 543                 }
 544         } else {
 545                 rc = tls_set_device_offload_rx(sk, ctx);
 546                 conf = TLS_HW;
 547                 if (rc) {
 548                         rc = tls_set_sw_offload(sk, ctx, 0);
 549                         if (rc)
 550                                 goto err_crypto_info;
 551                         conf = TLS_SW;
 552                 }
 553                 tls_sw_strparser_arm(sk, ctx);
 554         }
 555
 556         if (tx)
 557                 ctx->tx_conf = conf;
 558         else
 559                 ctx->rx_conf = conf;
 560         update_sk_prot(sk, ctx);
 561         if (tx) {
 562                 ctx->sk_write_space = sk->sk_write_space;
 563                 sk->sk_write_space = tls_write_space;
 564         } else {
 565                 sk->sk_socket->ops = &tls_sw_proto_ops;
 566         }
 567         goto out;
 568
 569 err_crypto_info:
 570         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 571 out:
 572         return rc;
 573 }
 574
 575 static int do_tls_setsockopt(struct sock *sk, int optname,
 576                              char __user *optval, unsigned int optlen)
 577 {
 578         int rc = 0;
 579
 580         switch (optname) {
 581         case TLS_TX:
 582         case TLS_RX:
 583                 lock_sock(sk);
 584                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 585                                             optname == TLS_TX);
 586                 release_sock(sk);
 587                 break;
 588         default:
 589                 rc = -ENOPROTOOPT;
 590                 break;
 591         }
 592         return rc;
 593 }
 594
 595 static int tls_setsockopt(struct sock *sk, int level, int optname,
 596                           char __user *optval, unsigned int optlen)
 597 {
 598         struct tls_context *ctx = tls_get_ctx(sk);
 599
 600         if (level != SOL_TLS)
 601                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 602                                                  optlen);
 603
 604         return do_tls_setsockopt(sk, optname, optval, optlen);
 605 }
 606
 607 static struct tls_context *create_ctx(struct sock *sk)
 608 {
 609         struct inet_connection_sock *icsk = inet_csk(sk);
 610         struct tls_context *ctx;
 611
 612         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 613         if (!ctx)
 614                 return NULL;
 615
 616         mutex_init(&ctx->tx_lock);
 617         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 618         ctx->sk_proto = sk->sk_prot;
 619         return ctx;
 620 }
 621
 622 static void tls_build_proto(struct sock *sk)
 623 {
 624         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 625
 626         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 627         if (ip_ver == TLSV6 &&
 628             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 629                 mutex_lock(&tcpv6_prot_mutex);
 630                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 631                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 632                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 633                 }
 634                 mutex_unlock(&tcpv6_prot_mutex);
 635         }
 636
 637         if (ip_ver == TLSV4 &&
 638             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
 639                 mutex_lock(&tcpv4_prot_mutex);
 640                 if (likely(sk->sk_prot != saved_tcpv4_prot)) {
 641                         build_protos(tls_prots[TLSV4], sk->sk_prot);
 642                         smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
 643                 }
 644                 mutex_unlock(&tcpv4_prot_mutex);
 645         }
 646 }
 647
 648 static void tls_hw_sk_destruct(struct sock *sk)
 649 {
 650         struct tls_context *ctx = tls_get_ctx(sk);
 651         struct inet_connection_sock *icsk = inet_csk(sk);
 652
 653         ctx->sk_destruct(sk);
 654         /* Free ctx */
 655         rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 656         tls_ctx_free(sk, ctx);
 657 }
 658
 659 static int tls_hw_prot(struct sock *sk)
 660 {
 661         struct tls_context *ctx;
 662         struct tls_device *dev;
 663         int rc = 0;
 664
 665         spin_lock_bh(&device_spinlock);
 666         list_for_each_entry(dev, &device_list, dev_list) {
 667                 if (dev->feature && dev->feature(dev)) {
 668                         ctx = create_ctx(sk);
 669                         if (!ctx)
 670                                 goto out;
 671
 672                         spin_unlock_bh(&device_spinlock);
 673                         tls_build_proto(sk);
 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->sk_proto->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->sk_proto->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         update_sk_prot(sk, ctx);
 805 out:
 806         write_unlock_bh(&sk->sk_callback_lock);
 807         return rc;
 808 }
 809
 810 static void tls_update(struct sock *sk, struct proto *p)
 811 {
 812         struct tls_context *ctx;
 813
 814         ctx = tls_get_ctx(sk);
 815         if (likely(ctx))
 816                 ctx->sk_proto = p;
 817         else
 818                 sk->sk_prot = p;
 819 }
 820
 821 static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
 822 {
 823         u16 version, cipher_type;
 824         struct tls_context *ctx;
 825         struct nlattr *start;
 826         int err;
 827
 828         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
 829         if (!start)
 830                 return -EMSGSIZE;
 831
 832         rcu_read_lock();
 833         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
 834         if (!ctx) {
 835                 err = 0;
 836                 goto nla_failure;
 837         }
 838         version = ctx->prot_info.version;
 839         if (version) {
 840                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
 841                 if (err)
 842                         goto nla_failure;
 843         }
 844         cipher_type = ctx->prot_info.cipher_type;
 845         if (cipher_type) {
 846                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
 847                 if (err)
 848                         goto nla_failure;
 849         }
 850         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
 851         if (err)
 852                 goto nla_failure;
 853
 854         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
 855         if (err)
 856                 goto nla_failure;
 857
 858         rcu_read_unlock();
 859         nla_nest_end(skb, start);
 860         return 0;
 861
 862 nla_failure:
 863         rcu_read_unlock();
 864         nla_nest_cancel(skb, start);
 865         return err;
 866 }
 867
 868 static size_t tls_get_info_size(const struct sock *sk)
 869 {
 870         size_t size = 0;
 871
 872         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
 873                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
 874                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
 875                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
 876                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
 877                 0;
 878
 879         return size;
 880 }
 881
 882 void tls_register_device(struct tls_device *device)
 883 {
 884         spin_lock_bh(&device_spinlock);
 885         list_add_tail(&device->dev_list, &device_list);
 886         spin_unlock_bh(&device_spinlock);
 887 }
 888 EXPORT_SYMBOL(tls_register_device);
 889
 890 void tls_unregister_device(struct tls_device *device)
 891 {
 892         spin_lock_bh(&device_spinlock);
 893         list_del(&device->dev_list);
 894         spin_unlock_bh(&device_spinlock);
 895 }
 896 EXPORT_SYMBOL(tls_unregister_device);
 897
 898 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 899         .name                   = "tls",
 900         .owner                  = THIS_MODULE,
 901         .init                   = tls_init,
 902         .update                 = tls_update,
 903         .get_info               = tls_get_info,
 904         .get_info_size          = tls_get_info_size,
 905 };
 906
 907 static int __init tls_register(void)
 908 {
 909         tls_sw_proto_ops = inet_stream_ops;
 910         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 911
 912         tls_device_init();
 913         tcp_register_ulp(&tcp_tls_ulp_ops);
 914
 915         return 0;
 916 }
 917
 918 static void __exit tls_unregister(void)
 919 {
 920         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 921         tls_device_cleanup();
 922 }
 923
 924 module_init(tls_register);
 925 module_exit(tls_unregister);