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
 271         if (sk)
 272                 kfree_rcu(ctx, rcu);
 273         else
 274                 kfree(ctx);
 275 }
 276
 277 static void tls_sk_proto_cleanup(struct sock *sk,
 278                                  struct tls_context *ctx, long timeo)
 279 {
 280         if (unlikely(sk->sk_write_pending) &&
 281             !wait_on_pending_writer(sk, &timeo))
 282                 tls_handle_open_record(sk, 0);
 283
 284         /* We need these for tls_sw_fallback handling of other packets */
 285         if (ctx->tx_conf == TLS_SW) {
 286                 kfree(ctx->tx.rec_seq);
 287                 kfree(ctx->tx.iv);
 288                 tls_sw_release_resources_tx(sk);
 289 #ifdef CONFIG_TLS_DEVICE
 290         } else if (ctx->tx_conf == TLS_HW) {
 291                 tls_device_free_resources_tx(sk);
 292 #endif
 293         }
 294
 295         if (ctx->rx_conf == TLS_SW)
 296                 tls_sw_release_resources_rx(sk);
 297
 298 #ifdef CONFIG_TLS_DEVICE
 299         if (ctx->rx_conf == TLS_HW)
 300                 tls_device_offload_cleanup_rx(sk);
 301 #endif
 302 }
 303
 304 static void tls_sk_proto_close(struct sock *sk, long timeout)
 305 {
 306         struct inet_connection_sock *icsk = inet_csk(sk);
 307         struct tls_context *ctx = tls_get_ctx(sk);
 308         long timeo = sock_sndtimeo(sk, 0);
 309         bool free_ctx;
 310
 311         if (ctx->tx_conf == TLS_SW)
 312                 tls_sw_cancel_work_tx(ctx);
 313
 314         lock_sock(sk);
 315         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 316
 317         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 318                 tls_sk_proto_cleanup(sk, ctx, timeo);
 319
 320         write_lock_bh(&sk->sk_callback_lock);
 321         if (free_ctx)
 322                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 323         sk->sk_prot = ctx->sk_proto;
 324         if (sk->sk_write_space == tls_write_space)
 325                 sk->sk_write_space = ctx->sk_write_space;
 326         write_unlock_bh(&sk->sk_callback_lock);
 327         release_sock(sk);
 328         if (ctx->tx_conf == TLS_SW)
 329                 tls_sw_free_ctx_tx(ctx);
 330         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 331                 tls_sw_strparser_done(ctx);
 332         if (ctx->rx_conf == TLS_SW)
 333                 tls_sw_free_ctx_rx(ctx);
 334         ctx->sk_proto_close(sk, timeout);
 335
 336         if (free_ctx)
 337                 tls_ctx_free(sk, ctx);
 338 }
 339
 340 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 341                                 int __user *optlen)
 342 {
 343         int rc = 0;
 344         struct tls_context *ctx = tls_get_ctx(sk);
 345         struct tls_crypto_info *crypto_info;
 346         int len;
 347
 348         if (get_user(len, optlen))
 349                 return -EFAULT;
 350
 351         if (!optval || (len < sizeof(*crypto_info))) {
 352                 rc = -EINVAL;
 353                 goto out;
 354         }
 355
 356         if (!ctx) {
 357                 rc = -EBUSY;
 358                 goto out;
 359         }
 360
 361         /* get user crypto info */
 362         crypto_info = &ctx->crypto_send.info;
 363
 364         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 365                 rc = -EBUSY;
 366                 goto out;
 367         }
 368
 369         if (len == sizeof(*crypto_info)) {
 370                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 371                         rc = -EFAULT;
 372                 goto out;
 373         }
 374
 375         switch (crypto_info->cipher_type) {
 376         case TLS_CIPHER_AES_GCM_128: {
 377                 struct tls12_crypto_info_aes_gcm_128 *
 378                   crypto_info_aes_gcm_128 =
 379                   container_of(crypto_info,
 380                                struct tls12_crypto_info_aes_gcm_128,
 381                                info);
 382
 383                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 384                         rc = -EINVAL;
 385                         goto out;
 386                 }
 387                 lock_sock(sk);
 388                 memcpy(crypto_info_aes_gcm_128->iv,
 389                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 390                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 391                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 392                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 393                 release_sock(sk);
 394                 if (copy_to_user(optval,
 395                                  crypto_info_aes_gcm_128,
 396                                  sizeof(*crypto_info_aes_gcm_128)))
 397                         rc = -EFAULT;
 398                 break;
 399         }
 400         case TLS_CIPHER_AES_GCM_256: {
 401                 struct tls12_crypto_info_aes_gcm_256 *
 402                   crypto_info_aes_gcm_256 =
 403                   container_of(crypto_info,
 404                                struct tls12_crypto_info_aes_gcm_256,
 405                                info);
 406
 407                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 408                         rc = -EINVAL;
 409                         goto out;
 410                 }
 411                 lock_sock(sk);
 412                 memcpy(crypto_info_aes_gcm_256->iv,
 413                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 414                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 415                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 416                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 417                 release_sock(sk);
 418                 if (copy_to_user(optval,
 419                                  crypto_info_aes_gcm_256,
 420                                  sizeof(*crypto_info_aes_gcm_256)))
 421                         rc = -EFAULT;
 422                 break;
 423         }
 424         default:
 425                 rc = -EINVAL;
 426         }
 427
 428 out:
 429         return rc;
 430 }
 431
 432 static int do_tls_getsockopt(struct sock *sk, int optname,
 433                              char __user *optval, int __user *optlen)
 434 {
 435         int rc = 0;
 436
 437         switch (optname) {
 438         case TLS_TX:
 439                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 440                 break;
 441         default:
 442                 rc = -ENOPROTOOPT;
 443                 break;
 444         }
 445         return rc;
 446 }
 447
 448 static int tls_getsockopt(struct sock *sk, int level, int optname,
 449                           char __user *optval, int __user *optlen)
 450 {
 451         struct tls_context *ctx = tls_get_ctx(sk);
 452
 453         if (level != SOL_TLS)
 454                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 455
 456         return do_tls_getsockopt(sk, optname, optval, optlen);
 457 }
 458
 459 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 460                                   unsigned int optlen, int tx)
 461 {
 462         struct tls_crypto_info *crypto_info;
 463         struct tls_crypto_info *alt_crypto_info;
 464         struct tls_context *ctx = tls_get_ctx(sk);
 465         size_t optsize;
 466         int rc = 0;
 467         int conf;
 468
 469         if (!optval || (optlen < sizeof(*crypto_info))) {
 470                 rc = -EINVAL;
 471                 goto out;
 472         }
 473
 474         if (tx) {
 475                 crypto_info = &ctx->crypto_send.info;
 476                 alt_crypto_info = &ctx->crypto_recv.info;
 477         } else {
 478                 crypto_info = &ctx->crypto_recv.info;
 479                 alt_crypto_info = &ctx->crypto_send.info;
 480         }
 481
 482         /* Currently we don't support set crypto info more than one time */
 483         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 484                 rc = -EBUSY;
 485                 goto out;
 486         }
 487
 488         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 489         if (rc) {
 490                 rc = -EFAULT;
 491                 goto err_crypto_info;
 492         }
 493
 494         /* check version */
 495         if (crypto_info->version != TLS_1_2_VERSION &&
 496             crypto_info->version != TLS_1_3_VERSION) {
 497                 rc = -ENOTSUPP;
 498                 goto err_crypto_info;
 499         }
 500
 501         /* Ensure that TLS version and ciphers are same in both directions */
 502         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 503                 if (alt_crypto_info->version != crypto_info->version ||
 504                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 505                         rc = -EINVAL;
 506                         goto err_crypto_info;
 507                 }
 508         }
 509
 510         switch (crypto_info->cipher_type) {
 511         case TLS_CIPHER_AES_GCM_128:
 512                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 513                 break;
 514         case TLS_CIPHER_AES_GCM_256: {
 515                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 516                 break;
 517         }
 518         case TLS_CIPHER_AES_CCM_128:
 519                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 520                 break;
 521         default:
 522                 rc = -EINVAL;
 523                 goto err_crypto_info;
 524         }
 525
 526         if (optlen != optsize) {
 527                 rc = -EINVAL;
 528                 goto err_crypto_info;
 529         }
 530
 531         rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 532                             optlen - sizeof(*crypto_info));
 533         if (rc) {
 534                 rc = -EFAULT;
 535                 goto err_crypto_info;
 536         }
 537
 538         if (tx) {
 539 #ifdef CONFIG_TLS_DEVICE
 540                 rc = tls_set_device_offload(sk, ctx);
 541                 conf = TLS_HW;
 542                 if (rc) {
 543 #else
 544                 {
 545 #endif
 546                         rc = tls_set_sw_offload(sk, ctx, 1);
 547                         if (rc)
 548                                 goto err_crypto_info;
 549                         conf = TLS_SW;
 550                 }
 551         } else {
 552 #ifdef CONFIG_TLS_DEVICE
 553                 rc = tls_set_device_offload_rx(sk, ctx);
 554                 conf = TLS_HW;
 555                 if (rc) {
 556 #else
 557                 {
 558 #endif
 559                         rc = tls_set_sw_offload(sk, ctx, 0);
 560                         if (rc)
 561                                 goto err_crypto_info;
 562                         conf = TLS_SW;
 563                 }
 564                 tls_sw_strparser_arm(sk, ctx);
 565         }
 566
 567         if (tx)
 568                 ctx->tx_conf = conf;
 569         else
 570                 ctx->rx_conf = conf;
 571         update_sk_prot(sk, ctx);
 572         if (tx) {
 573                 ctx->sk_write_space = sk->sk_write_space;
 574                 sk->sk_write_space = tls_write_space;
 575         } else {
 576                 sk->sk_socket->ops = &tls_sw_proto_ops;
 577         }
 578         goto out;
 579
 580 err_crypto_info:
 581         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 582 out:
 583         return rc;
 584 }
 585
 586 static int do_tls_setsockopt(struct sock *sk, int optname,
 587                              char __user *optval, unsigned int optlen)
 588 {
 589         int rc = 0;
 590
 591         switch (optname) {
 592         case TLS_TX:
 593         case TLS_RX:
 594                 lock_sock(sk);
 595                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 596                                             optname == TLS_TX);
 597                 release_sock(sk);
 598                 break;
 599         default:
 600                 rc = -ENOPROTOOPT;
 601                 break;
 602         }
 603         return rc;
 604 }
 605
 606 static int tls_setsockopt(struct sock *sk, int level, int optname,
 607                           char __user *optval, unsigned int optlen)
 608 {
 609         struct tls_context *ctx = tls_get_ctx(sk);
 610
 611         if (level != SOL_TLS)
 612                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 613
 614         return do_tls_setsockopt(sk, optname, optval, optlen);
 615 }
 616
 617 static struct tls_context *create_ctx(struct sock *sk)
 618 {
 619         struct inet_connection_sock *icsk = inet_csk(sk);
 620         struct tls_context *ctx;
 621
 622         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 623         if (!ctx)
 624                 return NULL;
 625
 626         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 627         ctx->setsockopt = sk->sk_prot->setsockopt;
 628         ctx->getsockopt = sk->sk_prot->getsockopt;
 629         ctx->sk_proto_close = sk->sk_prot->close;
 630         ctx->unhash = sk->sk_prot->unhash;
 631         return ctx;
 632 }
 633
 634 static void tls_build_proto(struct sock *sk)
 635 {
 636         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 637
 638         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 639         if (ip_ver == TLSV6 &&
 640             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 641                 mutex_lock(&tcpv6_prot_mutex);
 642                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 643                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 644                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 645                 }
 646                 mutex_unlock(&tcpv6_prot_mutex);
 647         }
 648
 649         if (ip_ver == TLSV4 &&
 650             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
 651                 mutex_lock(&tcpv4_prot_mutex);
 652                 if (likely(sk->sk_prot != saved_tcpv4_prot)) {
 653                         build_protos(tls_prots[TLSV4], sk->sk_prot);
 654                         smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
 655                 }
 656                 mutex_unlock(&tcpv4_prot_mutex);
 657         }
 658 }
 659
 660 static void tls_hw_sk_destruct(struct sock *sk)
 661 {
 662         struct tls_context *ctx = tls_get_ctx(sk);
 663         struct inet_connection_sock *icsk = inet_csk(sk);
 664
 665         ctx->sk_destruct(sk);
 666         /* Free ctx */
 667         rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 668         tls_ctx_free(sk, ctx);
 669 }
 670
 671 static int tls_hw_prot(struct sock *sk)
 672 {
 673         struct tls_context *ctx;
 674         struct tls_device *dev;
 675         int rc = 0;
 676
 677         spin_lock_bh(&device_spinlock);
 678         list_for_each_entry(dev, &device_list, dev_list) {
 679                 if (dev->feature && dev->feature(dev)) {
 680                         ctx = create_ctx(sk);
 681                         if (!ctx)
 682                                 goto out;
 683
 684                         spin_unlock_bh(&device_spinlock);
 685                         tls_build_proto(sk);
 686                         ctx->hash = sk->sk_prot->hash;
 687                         ctx->unhash = sk->sk_prot->unhash;
 688                         ctx->sk_proto_close = sk->sk_prot->close;
 689                         ctx->sk_destruct = sk->sk_destruct;
 690                         sk->sk_destruct = tls_hw_sk_destruct;
 691                         ctx->rx_conf = TLS_HW_RECORD;
 692                         ctx->tx_conf = TLS_HW_RECORD;
 693                         update_sk_prot(sk, ctx);
 694                         spin_lock_bh(&device_spinlock);
 695                         rc = 1;
 696                         break;
 697                 }
 698         }
 699 out:
 700         spin_unlock_bh(&device_spinlock);
 701         return rc;
 702 }
 703
 704 static void tls_hw_unhash(struct sock *sk)
 705 {
 706         struct tls_context *ctx = tls_get_ctx(sk);
 707         struct tls_device *dev;
 708
 709         spin_lock_bh(&device_spinlock);
 710         list_for_each_entry(dev, &device_list, dev_list) {
 711                 if (dev->unhash) {
 712                         kref_get(&dev->kref);
 713                         spin_unlock_bh(&device_spinlock);
 714                         dev->unhash(dev, sk);
 715                         kref_put(&dev->kref, dev->release);
 716                         spin_lock_bh(&device_spinlock);
 717                 }
 718         }
 719         spin_unlock_bh(&device_spinlock);
 720         ctx->unhash(sk);
 721 }
 722
 723 static int tls_hw_hash(struct sock *sk)
 724 {
 725         struct tls_context *ctx = tls_get_ctx(sk);
 726         struct tls_device *dev;
 727         int err;
 728
 729         err = ctx->hash(sk);
 730         spin_lock_bh(&device_spinlock);
 731         list_for_each_entry(dev, &device_list, dev_list) {
 732                 if (dev->hash) {
 733                         kref_get(&dev->kref);
 734                         spin_unlock_bh(&device_spinlock);
 735                         err |= dev->hash(dev, sk);
 736                         kref_put(&dev->kref, dev->release);
 737                         spin_lock_bh(&device_spinlock);
 738                 }
 739         }
 740         spin_unlock_bh(&device_spinlock);
 741
 742         if (err)
 743                 tls_hw_unhash(sk);
 744         return err;
 745 }
 746
 747 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 748                          struct proto *base)
 749 {
 750         prot[TLS_BASE][TLS_BASE] = *base;
 751         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 752         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 753         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 754
 755         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 756         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 757         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 758
 759         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 760         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 761         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 762         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 763
 764         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 765         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 766         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 767         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 768
 769 #ifdef CONFIG_TLS_DEVICE
 770         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 771         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 772         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 773
 774         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 775         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 776         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 777
 778         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 779
 780         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 781
 782         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 783 #endif
 784
 785         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 786         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 787         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 788 }
 789
 790 static int tls_init(struct sock *sk)
 791 {
 792         struct tls_context *ctx;
 793         int rc = 0;
 794
 795         if (tls_hw_prot(sk))
 796                 return 0;
 797
 798         /* The TLS ulp is currently supported only for TCP sockets
 799          * in ESTABLISHED state.
 800          * Supporting sockets in LISTEN state will require us
 801          * to modify the accept implementation to clone rather then
 802          * share the ulp context.
 803          */
 804         if (sk->sk_state != TCP_ESTABLISHED)
 805                 return -ENOTSUPP;
 806
 807         tls_build_proto(sk);
 808
 809         /* allocate tls context */
 810         write_lock_bh(&sk->sk_callback_lock);
 811         ctx = create_ctx(sk);
 812         if (!ctx) {
 813                 rc = -ENOMEM;
 814                 goto out;
 815         }
 816
 817         ctx->tx_conf = TLS_BASE;
 818         ctx->rx_conf = TLS_BASE;
 819         ctx->sk_proto = sk->sk_prot;
 820         update_sk_prot(sk, ctx);
 821 out:
 822         write_unlock_bh(&sk->sk_callback_lock);
 823         return rc;
 824 }
 825
 826 static void tls_update(struct sock *sk, struct proto *p)
 827 {
 828         struct tls_context *ctx;
 829
 830         ctx = tls_get_ctx(sk);
 831         if (likely(ctx)) {
 832                 ctx->sk_proto_close = p->close;
 833                 ctx->sk_proto = p;
 834         } else {
 835                 sk->sk_prot = p;
 836         }
 837 }
 838
 839 static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
 840 {
 841         u16 version, cipher_type;
 842         struct tls_context *ctx;
 843         struct nlattr *start;
 844         int err;
 845
 846         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
 847         if (!start)
 848                 return -EMSGSIZE;
 849
 850         rcu_read_lock();
 851         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
 852         if (!ctx) {
 853                 err = 0;
 854                 goto nla_failure;
 855         }
 856         version = ctx->prot_info.version;
 857         if (version) {
 858                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
 859                 if (err)
 860                         goto nla_failure;
 861         }
 862         cipher_type = ctx->prot_info.cipher_type;
 863         if (cipher_type) {
 864                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
 865                 if (err)
 866                         goto nla_failure;
 867         }
 868         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
 869         if (err)
 870                 goto nla_failure;
 871
 872         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
 873         if (err)
 874                 goto nla_failure;
 875
 876         rcu_read_unlock();
 877         nla_nest_end(skb, start);
 878         return 0;
 879
 880 nla_failure:
 881         rcu_read_unlock();
 882         nla_nest_cancel(skb, start);
 883         return err;
 884 }
 885
 886 static size_t tls_get_info_size(const struct sock *sk)
 887 {
 888         size_t size = 0;
 889
 890         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
 891                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
 892                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
 893                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
 894                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
 895                 0;
 896
 897         return size;
 898 }
 899
 900 void tls_register_device(struct tls_device *device)
 901 {
 902         spin_lock_bh(&device_spinlock);
 903         list_add_tail(&device->dev_list, &device_list);
 904         spin_unlock_bh(&device_spinlock);
 905 }
 906 EXPORT_SYMBOL(tls_register_device);
 907
 908 void tls_unregister_device(struct tls_device *device)
 909 {
 910         spin_lock_bh(&device_spinlock);
 911         list_del(&device->dev_list);
 912         spin_unlock_bh(&device_spinlock);
 913 }
 914 EXPORT_SYMBOL(tls_unregister_device);
 915
 916 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 917         .name                   = "tls",
 918         .owner                  = THIS_MODULE,
 919         .init                   = tls_init,
 920         .update                 = tls_update,
 921         .get_info               = tls_get_info,
 922         .get_info_size          = tls_get_info_size,
 923 };
 924
 925 static int __init tls_register(void)
 926 {
 927         tls_sw_proto_ops = inet_stream_ops;
 928         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 929
 930 #ifdef CONFIG_TLS_DEVICE
 931         tls_device_init();
 932 #endif
 933         tcp_register_ulp(&tcp_tls_ulp_ops);
 934
 935         return 0;
 936 }
 937
 938 static void __exit tls_unregister(void)
 939 {
 940         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 941 #ifdef CONFIG_TLS_DEVICE
 942         tls_device_cleanup();
 943 #endif
 944 }
 945
 946 module_init(tls_register);
 947 module_exit(tls_unregister);