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/snmp.h>
  45 #include <net/tls.h>
  46 #include <net/tls_toe.h>
  47
  48 MODULE_AUTHOR("Mellanox Technologies");
  49 MODULE_DESCRIPTION("Transport Layer Security Support");
  50 MODULE_LICENSE("Dual BSD/GPL");
  51 MODULE_ALIAS_TCP_ULP("tls");
  52
  53 enum {
  54         TLSV4,
  55         TLSV6,
  56         TLS_NUM_PROTS,
  57 };
  58
  59 static const struct proto *saved_tcpv6_prot;
  60 static DEFINE_MUTEX(tcpv6_prot_mutex);
  61 static const struct proto *saved_tcpv4_prot;
  62 static DEFINE_MUTEX(tcpv4_prot_mutex);
  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                          const struct proto *base);
  67
  68 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         WRITE_ONCE(sk->sk_prot,
  73                    &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
  74 }
  75
  76 int wait_on_pending_writer(struct sock *sk, long *timeo)
  77 {
  78         int rc = 0;
  79         DEFINE_WAIT_FUNC(wait, woken_wake_function);
  80
  81         add_wait_queue(sk_sleep(sk), &wait);
  82         while (1) {
  83                 if (!*timeo) {
  84                         rc = -EAGAIN;
  85                         break;
  86                 }
  87
  88                 if (signal_pending(current)) {
  89                         rc = sock_intr_errno(*timeo);
  90                         break;
  91                 }
  92
  93                 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
  94                         break;
  95         }
  96         remove_wait_queue(sk_sleep(sk), &wait);
  97         return rc;
  98 }
  99
 100 int tls_push_sg(struct sock *sk,
 101                 struct tls_context *ctx,
 102                 struct scatterlist *sg,
 103                 u16 first_offset,
 104                 int flags)
 105 {
 106         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 107         int ret = 0;
 108         struct page *p;
 109         size_t size;
 110         int offset = first_offset;
 111
 112         size = sg->length - offset;
 113         offset += sg->offset;
 114
 115         ctx->in_tcp_sendpages = true;
 116         while (1) {
 117                 if (sg_is_last(sg))
 118                         sendpage_flags = flags;
 119
 120                 /* is sending application-limited? */
 121                 tcp_rate_check_app_limited(sk);
 122                 p = sg_page(sg);
 123 retry:
 124                 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
 125
 126                 if (ret != size) {
 127                         if (ret > 0) {
 128                                 offset += ret;
 129                                 size -= ret;
 130                                 goto retry;
 131                         }
 132
 133                         offset -= sg->offset;
 134                         ctx->partially_sent_offset = offset;
 135                         ctx->partially_sent_record = (void *)sg;
 136                         ctx->in_tcp_sendpages = false;
 137                         return ret;
 138                 }
 139
 140                 put_page(p);
 141                 sk_mem_uncharge(sk, sg->length);
 142                 sg = sg_next(sg);
 143                 if (!sg)
 144                         break;
 145
 146                 offset = sg->offset;
 147                 size = sg->length;
 148         }
 149
 150         ctx->in_tcp_sendpages = false;
 151
 152         return 0;
 153 }
 154
 155 static int tls_handle_open_record(struct sock *sk, int flags)
 156 {
 157         struct tls_context *ctx = tls_get_ctx(sk);
 158
 159         if (tls_is_pending_open_record(ctx))
 160                 return ctx->push_pending_record(sk, flags);
 161
 162         return 0;
 163 }
 164
 165 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 166                       unsigned char *record_type)
 167 {
 168         struct cmsghdr *cmsg;
 169         int rc = -EINVAL;
 170
 171         for_each_cmsghdr(cmsg, msg) {
 172                 if (!CMSG_OK(msg, cmsg))
 173                         return -EINVAL;
 174                 if (cmsg->cmsg_level != SOL_TLS)
 175                         continue;
 176
 177                 switch (cmsg->cmsg_type) {
 178                 case TLS_SET_RECORD_TYPE:
 179                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 180                                 return -EINVAL;
 181
 182                         if (msg->msg_flags & MSG_MORE)
 183                                 return -EINVAL;
 184
 185                         rc = tls_handle_open_record(sk, msg->msg_flags);
 186                         if (rc)
 187                                 return rc;
 188
 189                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 190                         rc = 0;
 191                         break;
 192                 default:
 193                         return -EINVAL;
 194                 }
 195         }
 196
 197         return rc;
 198 }
 199
 200 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 201                             int flags)
 202 {
 203         struct scatterlist *sg;
 204         u16 offset;
 205
 206         sg = ctx->partially_sent_record;
 207         offset = ctx->partially_sent_offset;
 208
 209         ctx->partially_sent_record = NULL;
 210         return tls_push_sg(sk, ctx, sg, offset, flags);
 211 }
 212
 213 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 214 {
 215         struct scatterlist *sg;
 216
 217         for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
 218                 put_page(sg_page(sg));
 219                 sk_mem_uncharge(sk, sg->length);
 220         }
 221         ctx->partially_sent_record = NULL;
 222 }
 223
 224 static void tls_write_space(struct sock *sk)
 225 {
 226         struct tls_context *ctx = tls_get_ctx(sk);
 227
 228         /* If in_tcp_sendpages call lower protocol write space handler
 229          * to ensure we wake up any waiting operations there. For example
 230          * if do_tcp_sendpages where to call sk_wait_event.
 231          */
 232         if (ctx->in_tcp_sendpages) {
 233                 ctx->sk_write_space(sk);
 234                 return;
 235         }
 236
 237 #ifdef CONFIG_TLS_DEVICE
 238         if (ctx->tx_conf == TLS_HW)
 239                 tls_device_write_space(sk, ctx);
 240         else
 241 #endif
 242                 tls_sw_write_space(sk, ctx);
 243
 244         ctx->sk_write_space(sk);
 245 }
 246
 247 /**
 248  * tls_ctx_free() - free TLS ULP context
 249  * @sk:  socket to with @ctx is attached
 250  * @ctx: TLS context structure
 251  *
 252  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 253  * to which @ctx was attached has no outstanding references.
 254  */
 255 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 256 {
 257         if (!ctx)
 258                 return;
 259
 260         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 261         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 262         mutex_destroy(&ctx->tx_lock);
 263
 264         if (sk)
 265                 kfree_rcu(ctx, rcu);
 266         else
 267                 kfree(ctx);
 268 }
 269
 270 static void tls_sk_proto_cleanup(struct sock *sk,
 271                                  struct tls_context *ctx, long timeo)
 272 {
 273         if (unlikely(sk->sk_write_pending) &&
 274             !wait_on_pending_writer(sk, &timeo))
 275                 tls_handle_open_record(sk, 0);
 276
 277         /* We need these for tls_sw_fallback handling of other packets */
 278         if (ctx->tx_conf == TLS_SW) {
 279                 kfree(ctx->tx.rec_seq);
 280                 kfree(ctx->tx.iv);
 281                 tls_sw_release_resources_tx(sk);
 282                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 283         } else if (ctx->tx_conf == TLS_HW) {
 284                 tls_device_free_resources_tx(sk);
 285                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 286         }
 287
 288         if (ctx->rx_conf == TLS_SW) {
 289                 tls_sw_release_resources_rx(sk);
 290                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 291         } else if (ctx->rx_conf == TLS_HW) {
 292                 tls_device_offload_cleanup_rx(sk);
 293                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 294         }
 295 }
 296
 297 static void tls_sk_proto_close(struct sock *sk, long timeout)
 298 {
 299         struct inet_connection_sock *icsk = inet_csk(sk);
 300         struct tls_context *ctx = tls_get_ctx(sk);
 301         long timeo = sock_sndtimeo(sk, 0);
 302         bool free_ctx;
 303
 304         if (ctx->tx_conf == TLS_SW)
 305                 tls_sw_cancel_work_tx(ctx);
 306
 307         lock_sock(sk);
 308         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 309
 310         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 311                 tls_sk_proto_cleanup(sk, ctx, timeo);
 312
 313         write_lock_bh(&sk->sk_callback_lock);
 314         if (free_ctx)
 315                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 316         WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
 317         if (sk->sk_write_space == tls_write_space)
 318                 sk->sk_write_space = ctx->sk_write_space;
 319         write_unlock_bh(&sk->sk_callback_lock);
 320         release_sock(sk);
 321         if (ctx->tx_conf == TLS_SW)
 322                 tls_sw_free_ctx_tx(ctx);
 323         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 324                 tls_sw_strparser_done(ctx);
 325         if (ctx->rx_conf == TLS_SW)
 326                 tls_sw_free_ctx_rx(ctx);
 327         ctx->sk_proto->close(sk, timeout);
 328
 329         if (free_ctx)
 330                 tls_ctx_free(sk, ctx);
 331 }
 332
 333 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 334                                 int __user *optlen)
 335 {
 336         int rc = 0;
 337         struct tls_context *ctx = tls_get_ctx(sk);
 338         struct tls_crypto_info *crypto_info;
 339         int len;
 340
 341         if (get_user(len, optlen))
 342                 return -EFAULT;
 343
 344         if (!optval || (len < sizeof(*crypto_info))) {
 345                 rc = -EINVAL;
 346                 goto out;
 347         }
 348
 349         if (!ctx) {
 350                 rc = -EBUSY;
 351                 goto out;
 352         }
 353
 354         /* get user crypto info */
 355         crypto_info = &ctx->crypto_send.info;
 356
 357         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 358                 rc = -EBUSY;
 359                 goto out;
 360         }
 361
 362         if (len == sizeof(*crypto_info)) {
 363                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 364                         rc = -EFAULT;
 365                 goto out;
 366         }
 367
 368         switch (crypto_info->cipher_type) {
 369         case TLS_CIPHER_AES_GCM_128: {
 370                 struct tls12_crypto_info_aes_gcm_128 *
 371                   crypto_info_aes_gcm_128 =
 372                   container_of(crypto_info,
 373                                struct tls12_crypto_info_aes_gcm_128,
 374                                info);
 375
 376                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 377                         rc = -EINVAL;
 378                         goto out;
 379                 }
 380                 lock_sock(sk);
 381                 memcpy(crypto_info_aes_gcm_128->iv,
 382                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 383                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 384                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 385                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 386                 release_sock(sk);
 387                 if (copy_to_user(optval,
 388                                  crypto_info_aes_gcm_128,
 389                                  sizeof(*crypto_info_aes_gcm_128)))
 390                         rc = -EFAULT;
 391                 break;
 392         }
 393         case TLS_CIPHER_AES_GCM_256: {
 394                 struct tls12_crypto_info_aes_gcm_256 *
 395                   crypto_info_aes_gcm_256 =
 396                   container_of(crypto_info,
 397                                struct tls12_crypto_info_aes_gcm_256,
 398                                info);
 399
 400                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 401                         rc = -EINVAL;
 402                         goto out;
 403                 }
 404                 lock_sock(sk);
 405                 memcpy(crypto_info_aes_gcm_256->iv,
 406                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 407                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 408                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 409                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 410                 release_sock(sk);
 411                 if (copy_to_user(optval,
 412                                  crypto_info_aes_gcm_256,
 413                                  sizeof(*crypto_info_aes_gcm_256)))
 414                         rc = -EFAULT;
 415                 break;
 416         }
 417         default:
 418                 rc = -EINVAL;
 419         }
 420
 421 out:
 422         return rc;
 423 }
 424
 425 static int do_tls_getsockopt(struct sock *sk, int optname,
 426                              char __user *optval, int __user *optlen)
 427 {
 428         int rc = 0;
 429
 430         switch (optname) {
 431         case TLS_TX:
 432                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 433                 break;
 434         default:
 435                 rc = -ENOPROTOOPT;
 436                 break;
 437         }
 438         return rc;
 439 }
 440
 441 static int tls_getsockopt(struct sock *sk, int level, int optname,
 442                           char __user *optval, int __user *optlen)
 443 {
 444         struct tls_context *ctx = tls_get_ctx(sk);
 445
 446         if (level != SOL_TLS)
 447                 return ctx->sk_proto->getsockopt(sk, level,
 448                                                  optname, optval, optlen);
 449
 450         return do_tls_getsockopt(sk, optname, optval, optlen);
 451 }
 452
 453 static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 454                                   unsigned int optlen, int tx)
 455 {
 456         struct tls_crypto_info *crypto_info;
 457         struct tls_crypto_info *alt_crypto_info;
 458         struct tls_context *ctx = tls_get_ctx(sk);
 459         size_t optsize;
 460         int rc = 0;
 461         int conf;
 462
 463         if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info))) {
 464                 rc = -EINVAL;
 465                 goto out;
 466         }
 467
 468         if (tx) {
 469                 crypto_info = &ctx->crypto_send.info;
 470                 alt_crypto_info = &ctx->crypto_recv.info;
 471         } else {
 472                 crypto_info = &ctx->crypto_recv.info;
 473                 alt_crypto_info = &ctx->crypto_send.info;
 474         }
 475
 476         /* Currently we don't support set crypto info more than one time */
 477         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 478                 rc = -EBUSY;
 479                 goto out;
 480         }
 481
 482         rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 483         if (rc) {
 484                 rc = -EFAULT;
 485                 goto err_crypto_info;
 486         }
 487
 488         /* check version */
 489         if (crypto_info->version != TLS_1_2_VERSION &&
 490             crypto_info->version != TLS_1_3_VERSION) {
 491                 rc = -EINVAL;
 492                 goto err_crypto_info;
 493         }
 494
 495         /* Ensure that TLS version and ciphers are same in both directions */
 496         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 497                 if (alt_crypto_info->version != crypto_info->version ||
 498                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 499                         rc = -EINVAL;
 500                         goto err_crypto_info;
 501                 }
 502         }
 503
 504         switch (crypto_info->cipher_type) {
 505         case TLS_CIPHER_AES_GCM_128:
 506                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 507                 break;
 508         case TLS_CIPHER_AES_GCM_256: {
 509                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 510                 break;
 511         }
 512         case TLS_CIPHER_AES_CCM_128:
 513                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 514                 break;
 515         default:
 516                 rc = -EINVAL;
 517                 goto err_crypto_info;
 518         }
 519
 520         if (optlen != optsize) {
 521                 rc = -EINVAL;
 522                 goto err_crypto_info;
 523         }
 524
 525         rc = copy_from_sockptr_offset(crypto_info + 1, optval,
 526                                       sizeof(*crypto_info),
 527                                       optlen - sizeof(*crypto_info));
 528         if (rc) {
 529                 rc = -EFAULT;
 530                 goto err_crypto_info;
 531         }
 532
 533         if (tx) {
 534                 rc = tls_set_device_offload(sk, ctx);
 535                 conf = TLS_HW;
 536                 if (!rc) {
 537                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
 538                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 539                 } else {
 540                         rc = tls_set_sw_offload(sk, ctx, 1);
 541                         if (rc)
 542                                 goto err_crypto_info;
 543                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
 544                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 545                         conf = TLS_SW;
 546                 }
 547         } else {
 548                 rc = tls_set_device_offload_rx(sk, ctx);
 549                 conf = TLS_HW;
 550                 if (!rc) {
 551                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
 552                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 553                 } else {
 554                         rc = tls_set_sw_offload(sk, ctx, 0);
 555                         if (rc)
 556                                 goto err_crypto_info;
 557                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
 558                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 559                         conf = TLS_SW;
 560                 }
 561                 tls_sw_strparser_arm(sk, ctx);
 562         }
 563
 564         if (tx)
 565                 ctx->tx_conf = conf;
 566         else
 567                 ctx->rx_conf = conf;
 568         update_sk_prot(sk, ctx);
 569         if (tx) {
 570                 ctx->sk_write_space = sk->sk_write_space;
 571                 sk->sk_write_space = tls_write_space;
 572         } else {
 573                 sk->sk_socket->ops = &tls_sw_proto_ops;
 574         }
 575         goto out;
 576
 577 err_crypto_info:
 578         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 579 out:
 580         return rc;
 581 }
 582
 583 static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 584                              unsigned int optlen)
 585 {
 586         int rc = 0;
 587
 588         switch (optname) {
 589         case TLS_TX:
 590         case TLS_RX:
 591                 lock_sock(sk);
 592                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 593                                             optname == TLS_TX);
 594                 release_sock(sk);
 595                 break;
 596         default:
 597                 rc = -ENOPROTOOPT;
 598                 break;
 599         }
 600         return rc;
 601 }
 602
 603 static int tls_setsockopt(struct sock *sk, int level, int optname,
 604                           sockptr_t optval, unsigned int optlen)
 605 {
 606         struct tls_context *ctx = tls_get_ctx(sk);
 607
 608         if (level != SOL_TLS)
 609                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 610                                                  optlen);
 611
 612         return do_tls_setsockopt(sk, optname, optval, optlen);
 613 }
 614
 615 struct tls_context *tls_ctx_create(struct sock *sk)
 616 {
 617         struct inet_connection_sock *icsk = inet_csk(sk);
 618         struct tls_context *ctx;
 619
 620         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 621         if (!ctx)
 622                 return NULL;
 623
 624         mutex_init(&ctx->tx_lock);
 625         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 626         ctx->sk_proto = READ_ONCE(sk->sk_prot);
 627         return ctx;
 628 }
 629
 630 static void tls_build_proto(struct sock *sk)
 631 {
 632         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 633         struct proto *prot = READ_ONCE(sk->sk_prot);
 634
 635         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 636         if (ip_ver == TLSV6 &&
 637             unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
 638                 mutex_lock(&tcpv6_prot_mutex);
 639                 if (likely(prot != saved_tcpv6_prot)) {
 640                         build_protos(tls_prots[TLSV6], prot);
 641                         smp_store_release(&saved_tcpv6_prot, prot);
 642                 }
 643                 mutex_unlock(&tcpv6_prot_mutex);
 644         }
 645
 646         if (ip_ver == TLSV4 &&
 647             unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
 648                 mutex_lock(&tcpv4_prot_mutex);
 649                 if (likely(prot != saved_tcpv4_prot)) {
 650                         build_protos(tls_prots[TLSV4], prot);
 651                         smp_store_release(&saved_tcpv4_prot, prot);
 652                 }
 653                 mutex_unlock(&tcpv4_prot_mutex);
 654         }
 655 }
 656
 657 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 658                          const struct proto *base)
 659 {
 660         prot[TLS_BASE][TLS_BASE] = *base;
 661         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 662         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 663         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 664
 665         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 666         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 667         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 668
 669         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 670         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 671         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 672         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 673
 674         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 675         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 676         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 677         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 678
 679 #ifdef CONFIG_TLS_DEVICE
 680         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 681         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 682         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 683
 684         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 685         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 686         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 687
 688         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 689
 690         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 691
 692         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 693 #endif
 694 #ifdef CONFIG_TLS_TOE
 695         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 696         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_toe_hash;
 697         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_toe_unhash;
 698 #endif
 699 }
 700
 701 static int tls_init(struct sock *sk)
 702 {
 703         struct tls_context *ctx;
 704         int rc = 0;
 705
 706         tls_build_proto(sk);
 707
 708 #ifdef CONFIG_TLS_TOE
 709         if (tls_toe_bypass(sk))
 710                 return 0;
 711 #endif
 712
 713         /* The TLS ulp is currently supported only for TCP sockets
 714          * in ESTABLISHED state.
 715          * Supporting sockets in LISTEN state will require us
 716          * to modify the accept implementation to clone rather then
 717          * share the ulp context.
 718          */
 719         if (sk->sk_state != TCP_ESTABLISHED)
 720                 return -ENOTCONN;
 721
 722         /* allocate tls context */
 723         write_lock_bh(&sk->sk_callback_lock);
 724         ctx = tls_ctx_create(sk);
 725         if (!ctx) {
 726                 rc = -ENOMEM;
 727                 goto out;
 728         }
 729
 730         ctx->tx_conf = TLS_BASE;
 731         ctx->rx_conf = TLS_BASE;
 732         update_sk_prot(sk, ctx);
 733 out:
 734         write_unlock_bh(&sk->sk_callback_lock);
 735         return rc;
 736 }
 737
 738 static void tls_update(struct sock *sk, struct proto *p,
 739                        void (*write_space)(struct sock *sk))
 740 {
 741         struct tls_context *ctx;
 742
 743         ctx = tls_get_ctx(sk);
 744         if (likely(ctx)) {
 745                 ctx->sk_write_space = write_space;
 746                 ctx->sk_proto = p;
 747         } else {
 748                 /* Pairs with lockless read in sk_clone_lock(). */
 749                 WRITE_ONCE(sk->sk_prot, p);
 750                 sk->sk_write_space = write_space;
 751         }
 752 }
 753
 754 static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
 755 {
 756         u16 version, cipher_type;
 757         struct tls_context *ctx;
 758         struct nlattr *start;
 759         int err;
 760
 761         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
 762         if (!start)
 763                 return -EMSGSIZE;
 764
 765         rcu_read_lock();
 766         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
 767         if (!ctx) {
 768                 err = 0;
 769                 goto nla_failure;
 770         }
 771         version = ctx->prot_info.version;
 772         if (version) {
 773                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
 774                 if (err)
 775                         goto nla_failure;
 776         }
 777         cipher_type = ctx->prot_info.cipher_type;
 778         if (cipher_type) {
 779                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
 780                 if (err)
 781                         goto nla_failure;
 782         }
 783         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
 784         if (err)
 785                 goto nla_failure;
 786
 787         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
 788         if (err)
 789                 goto nla_failure;
 790
 791         rcu_read_unlock();
 792         nla_nest_end(skb, start);
 793         return 0;
 794
 795 nla_failure:
 796         rcu_read_unlock();
 797         nla_nest_cancel(skb, start);
 798         return err;
 799 }
 800
 801 static size_t tls_get_info_size(const struct sock *sk)
 802 {
 803         size_t size = 0;
 804
 805         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
 806                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
 807                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
 808                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
 809                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
 810                 0;
 811
 812         return size;
 813 }
 814
 815 static int __net_init tls_init_net(struct net *net)
 816 {
 817         int err;
 818
 819         net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
 820         if (!net->mib.tls_statistics)
 821                 return -ENOMEM;
 822
 823         err = tls_proc_init(net);
 824         if (err)
 825                 goto err_free_stats;
 826
 827         return 0;
 828 err_free_stats:
 829         free_percpu(net->mib.tls_statistics);
 830         return err;
 831 }
 832
 833 static void __net_exit tls_exit_net(struct net *net)
 834 {
 835         tls_proc_fini(net);
 836         free_percpu(net->mib.tls_statistics);
 837 }
 838
 839 static struct pernet_operations tls_proc_ops = {
 840         .init = tls_init_net,
 841         .exit = tls_exit_net,
 842 };
 843
 844 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 845         .name                   = "tls",
 846         .owner                  = THIS_MODULE,
 847         .init                   = tls_init,
 848         .update                 = tls_update,
 849         .get_info               = tls_get_info,
 850         .get_info_size          = tls_get_info_size,
 851 };
 852
 853 static int __init tls_register(void)
 854 {
 855         int err;
 856
 857         err = register_pernet_subsys(&tls_proc_ops);
 858         if (err)
 859                 return err;
 860
 861         tls_sw_proto_ops = inet_stream_ops;
 862         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 863         tls_sw_proto_ops.sendpage_locked   = tls_sw_sendpage_locked,
 864
 865         tls_device_init();
 866         tcp_register_ulp(&tcp_tls_ulp_ops);
 867
 868         return 0;
 869 }
 870
 871 static void __exit tls_unregister(void)
 872 {
 873         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 874         tls_device_cleanup();
 875         unregister_pernet_subsys(&tls_proc_ops);
 876 }
 877
 878 module_init(tls_register);
 879 module_exit(tls_unregister);